libexec/ftpd/ftpd.c

   1 /*
   2  * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 The Regents of the University of California.  All rights reserved.
  34  * @(#)ftpd.c   8.4 (Berkeley) 4/16/94
  35  */
  36
  37 #if 0
  38 static const char rcsid[] =
  39   "$FreeBSD: src/libexec/ftpd/ftpd.c,v 1.62.2.48 2003/02/14 12:42:42 yar Exp $";
  40   "$DragonFly: src/libexec/ftpd/ftpd.c,v 1.7 2005/10/28 18:06:57 joerg Exp $";
  41 #endif /* not lint */
  42
  43 /*
  44  * FTP server.
  45  */
  46 #include <sys/param.h>
  47 #include <sys/ioctl.h>
  48 #include <sys/mman.h>
  49 #include <sys/socket.h>
  50 #include <sys/stat.h>
  51 #include <sys/time.h>
  52 #include <sys/wait.h>
  53
  54 #include <netinet/in.h>
  55 #include <netinet/in_systm.h>
  56 #include <netinet/ip.h>
  57 #include <netinet/tcp.h>
  58
  59 #define FTP_NAMES
  60 #include <arpa/ftp.h>
  61 #include <arpa/inet.h>
  62 #include <arpa/telnet.h>
  63
  64 #include <ctype.h>
  65 #include <dirent.h>
  66 #include <err.h>
  67 #include <errno.h>
  68 #include <fcntl.h>
  69 #include <glob.h>
  70 #include <limits.h>
  71 #include <netdb.h>
  72 #include <pwd.h>
  73 #include <grp.h>
  74 #include <signal.h>
  75 #include <stdio.h>
  76 #include <stdlib.h>
  77 #include <string.h>
  78 #include <syslog.h>
  79 #include <time.h>
  80 #include <unistd.h>
  81 #include <libutil.h>
  82 #ifdef  LOGIN_CAP
  83 #include <login_cap.h>
  84 #endif
  85
  86 #ifdef  SKEY
  87 #include <skey.h>
  88 #endif
  89
  90 #if !defined(NOPAM)
  91 #include <security/pam_appl.h>
  92 #endif
  93
  94 #include "pathnames.h"
  95 #include "extern.h"
  96
  97 #if __STDC__
  98 #include <stdarg.h>
  99 #else
 100 #include <varargs.h>
 101 #endif
 102
 103 static char version[] = "Version 6.00LS";
 104 #undef main
 105
 106 extern  off_t restart_point;
 107 extern  char cbuf[];
 108
 109 union sockunion server_addr;
 110 union sockunion ctrl_addr;
 111 union sockunion data_source;
 112 union sockunion data_dest;
 113 union sockunion his_addr;
 114 union sockunion pasv_addr;
 115
 116 int     daemon_mode;
 117 int     data;
 118 int     dataport;
 119 int     hostinfo = 1;   /* print host-specific info in messages */
 120 int     logged_in;
 121 struct  passwd *pw;
 122 char    *homedir;
 123 int     ftpdebug;
 124 int     timeout = 900;    /* timeout after 15 minutes of inactivity */
 125 int     maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
 126 int     logging;
 127 int     restricted_data_ports = 1;
 128 int     paranoid = 1;     /* be extra careful about security */
 129 int     anon_only = 0;    /* Only anonymous ftp allowed */
 130 int     guest;
 131 int     dochroot;
 132 int     dowtmp = 1;
 133 int     stats;
 134 int     statfd = -1;
 135 int     type;
 136 int     form;
 137 int     stru;                   /* avoid C keyword */
 138 int     mode;
 139 int     usedefault = 1;         /* for data transfers */
 140 int     pdata = -1;             /* for passive mode */
 141 int     readonly=0;             /* Server is in readonly mode.  */
 142 int     noepsv=0;               /* EPSV command is disabled.    */
 143 int     noretr=0;               /* RETR command is disabled.    */
 144 int     noguestretr=0;          /* RETR command is disabled for anon users. */
 145 int     noguestmkd=0;           /* MKD command is disabled for anon users. */
 146 int     noguestmod=1;           /* anon users may not modify existing files. */
 147
 148 static volatile sig_atomic_t recvurg;
 149 sig_atomic_t transflag;
 150 off_t   file_size;
 151 off_t   byte_count;
 152 #if !defined(CMASK) || CMASK == 0
 153 #undef CMASK
 154 #define CMASK 027
 155 #endif
 156 int     defumask = CMASK;               /* default umask value */
 157 char    tmpline[7];
 158 char    *hostname;
 159 int     epsvall = 0;
 160
 161 #ifdef VIRTUAL_HOSTING
 162 char    *ftpuser;
 163
 164 static struct ftphost {
 165         struct ftphost  *next;
 166         struct addrinfo *hostinfo;
 167         char            *hostname;
 168         char            *anonuser;
 169         char            *statfile;
 170         char            *welcome;
 171         char            *loginmsg;
 172 } *thishost, *firsthost;
 173
 174 #endif
 175 char    remotehost[MAXHOSTNAMELEN];
 176 char    *ident = NULL;
 177
 178 static char ttyline[20];
 179 char    *tty = ttyline;         /* for klogin */
 180
 181 #if !defined(NOPAM)
 182 static int      auth_pam (struct passwd**, const char*);
 183 #endif
 184
 185 char    *pid_file = NULL;
 186
 187 /*
 188  * Limit number of pathnames that glob can return.
 189  * A limit of 0 indicates the number of pathnames is unlimited.
 190  */
 191 #define MAXGLOBARGS     16384
 192 #
 193
 194 /*
 195  * Timeout intervals for retrying connections
 196  * to hosts that don't accept PORT cmds.  This
 197  * is a kludge, but given the problems with TCP...
 198  */
 199 #define SWAITMAX        90      /* wait at most 90 seconds */
 200 #define SWAITINT        5       /* interval between retries */
 201
 202 int     swaitmax = SWAITMAX;
 203 int     swaitint = SWAITINT;
 204
 205 #ifdef SETPROCTITLE
 206 #ifdef OLD_SETPROCTITLE
 207 char    **Argv = NULL;          /* pointer to argument vector */
 208 char    *LastArgv = NULL;       /* end of argv */
 209 #endif /* OLD_SETPROCTITLE */
 210 char    proctitle[LINE_MAX];    /* initial part of title */
 211 #endif /* SETPROCTITLE */
 212
 213 #ifdef SKEY
 214 int     pwok = 0;
 215 #endif
 216
 217 #define LOGCMD(cmd, file) \
 218         if (logging > 1) \
 219             syslog(LOG_INFO,"%s %s%s", cmd, \
 220                 *(file) == '/' ? "" : curdir(), file);
 221 #define LOGCMD2(cmd, file1, file2) \
 222          if (logging > 1) \
 223             syslog(LOG_INFO,"%s %s%s %s%s", cmd, \
 224                 *(file1) == '/' ? "" : curdir(), file1, \
 225                 *(file2) == '/' ? "" : curdir(), file2);
 226 #define LOGBYTES(cmd, file, cnt) \
 227         if (logging > 1) { \
 228                 if (cnt == (off_t)-1) \
 229                     syslog(LOG_INFO,"%s %s%s", cmd, \
 230                         *(file) == '/' ? "" : curdir(), file); \
 231                 else \
 232                     syslog(LOG_INFO, "%s %s%s = %qd bytes", \
 233                         cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \
 234         }
 235
 236 #ifdef VIRTUAL_HOSTING
 237 static void      inithosts (void);
 238 static void     selecthost (union sockunion *);
 239 #endif
 240 static void      ack (char *);
 241 static void      sigurg (int);
 242 static void      myoob (void);
 243 static int       checkuser (char *, char *, int, char **);
 244 static FILE     *dataconn (char *, off_t, char *);
 245 static void      dolog (struct sockaddr *);
 246 static char     *curdir (void);
 247 static void      end_login (void);
 248 static FILE     *getdatasock (char *);
 249 static int       guniquefd (char *, char **);
 250 static void      lostconn (int);
 251 static void      sigquit (int);
 252 static int       receive_data (FILE *, FILE *);
 253 static int       send_data (FILE *, FILE *, off_t, off_t, int);
 254 static struct passwd *
 255                  sgetpwnam (char *);
 256 static char     *sgetsave (char *);
 257 static void      reapchild (int);
 258 static void      logxfer (char *, off_t, time_t);
 259 static char     *doublequote (char *);
 260
 261 static char *
 262 curdir()
 263 {
 264         static char path[MAXPATHLEN+1+1];       /* path + '/' + '\0' */
 265
 266         if (getcwd(path, sizeof(path)-2) == NULL)
 267                 return ("");
 268         if (path[1] != '\0')            /* special case for root dir. */
 269                 strcat(path, "/");
 270         /* For guest account, skip / since it's chrooted */
 271         return (guest ? path+1 : path);
 272 }
 273
 274 int
 275 main(argc, argv, envp)
 276         int argc;
 277         char *argv[];
 278         char **envp;
 279 {
 280         int addrlen, ch, on = 1, tos;
 281         char *cp, line[LINE_MAX];
 282         FILE *fd;
 283         int error;
 284         char    *bindname = NULL;
 285         const char *bindport = "ftp";
 286         int     family = AF_UNSPEC;
 287         int     enable_v4 = 0;
 288         struct sigaction sa;
 289
 290         tzset();                /* in case no timezone database in ~ftp */
 291         sigemptyset(&sa.sa_mask);
 292         sa.sa_flags = SA_RESTART;
 293
 294 #ifdef OLD_SETPROCTITLE
 295         /*
 296          *  Save start and extent of argv for setproctitle.
 297          */
 298         Argv = argv;
 299         while (*envp)
 300                 envp++;
 301         LastArgv = envp[-1] + strlen(envp[-1]);
 302 #endif /* OLD_SETPROCTITLE */
 303
 304
 305         while ((ch = getopt(argc, argv,
 306                             "46a:AdDEH:hlmMoOp:P:rRSt:T:u:UvW")) != -1) {
 307                 switch (ch) {
 308                 case '4':
 309                         enable_v4 = 1;
 310                         if (family == AF_UNSPEC)
 311                                 family = AF_INET;
 312                         break;
 313
 314                 case '6':
 315                         family = AF_INET6;
 316                         break;
 317
 318                 case 'a':
 319                         bindname = optarg;
 320                         break;
 321
 322                 case 'A':
 323                         anon_only = 1;
 324                         break;
 325
 326                 case 'd':
 327                         ftpdebug++;
 328                         break;
 329
 330                 case 'D':
 331                         daemon_mode++;
 332                         break;
 333
 334                 case 'E':
 335                         noepsv = 1;
 336                         break;
 337
 338                 case 'h':
 339                         hostinfo = 0;
 340                         break;
 341
 342                 case 'H':
 343                         hostname = optarg;
 344                         break;
 345
 346                 case 'l':
 347                         logging++;      /* > 1 == extra logging */
 348                         break;
 349
 350                 case 'm':
 351                         noguestmod = 0;
 352                         break;
 353
 354                 case 'M':
 355                         noguestmkd = 1;
 356                         break;
 357
 358                 case 'o':
 359                         noretr = 1;
 360                         break;
 361
 362                 case 'O':
 363                         noguestretr = 1;
 364                         break;
 365
 366                 case 'p':
 367                         pid_file = optarg;
 368                         break;
 369
 370                 case 'P':
 371                         bindport = optarg;
 372                         break;
 373
 374                 case 'r':
 375                         readonly = 1;
 376                         break;
 377
 378                 case 'R':
 379                         paranoid = 0;
 380                         break;
 381
 382                 case 'S':
 383                         stats++;
 384                         break;
 385
 386                 case 't':
 387                         timeout = atoi(optarg);
 388                         if (maxtimeout < timeout)
 389                                 maxtimeout = timeout;
 390                         break;
 391
 392                 case 'T':
 393                         maxtimeout = atoi(optarg);
 394                         if (timeout > maxtimeout)
 395                                 timeout = maxtimeout;
 396                         break;
 397
 398                 case 'u':
 399                     {
 400                         long val = 0;
 401
 402                         val = strtol(optarg, &optarg, 8);
 403                         if (*optarg != '\0' || val < 0)
 404                                 warnx("bad value for -u");
 405                         else
 406                                 defumask = val;
 407                         break;
 408                     }
 409                 case 'U':
 410                         restricted_data_ports = 0;
 411                         break;
 412
 413                 case 'v':
 414                         ftpdebug++;
 415                         break;
 416
 417                 case 'W':
 418                         dowtmp = 0;
 419                         break;
 420
 421                 default:
 422                         warnx("unknown flag -%c ignored", optopt);
 423                         break;
 424                 }
 425         }
 426
 427 #ifdef VIRTUAL_HOSTING
 428         inithosts();
 429 #endif
 430         (void) freopen(_PATH_DEVNULL, "w", stderr);
 431
 432         /*
 433          * LOG_NDELAY sets up the logging connection immediately,
 434          * necessary for anonymous ftp's that chroot and can't do it later.
 435          */
 436         openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
 437
 438         if (daemon_mode) {
 439                 int ctl_sock, fd;
 440                 struct addrinfo hints, *res;
 441
 442                 /*
 443                  * Detach from parent.
 444                  */
 445                 if (daemon(1, 1) < 0) {
 446                         syslog(LOG_ERR, "failed to become a daemon");
 447                         exit(1);
 448                 }
 449                 sa.sa_handler = reapchild;
 450                 (void)sigaction(SIGCHLD, &sa, NULL);
 451                 /* init bind_sa */
 452                 memset(&hints, 0, sizeof(hints));
 453
 454                 hints.ai_family = family == AF_UNSPEC ? AF_INET : family;
 455                 hints.ai_socktype = SOCK_STREAM;
 456                 hints.ai_protocol = 0;
 457                 hints.ai_flags = AI_PASSIVE;
 458                 error = getaddrinfo(bindname, bindport, &hints, &res);
 459                 if (error) {
 460                         if (family == AF_UNSPEC) {
 461                                 hints.ai_family = AF_UNSPEC;
 462                                 error = getaddrinfo(bindname, bindport, &hints,
 463                                                     &res);
 464                         }
 465                 }
 466                 if (error) {
 467                         syslog(LOG_ERR, "%s", gai_strerror(error));
 468                         if (error == EAI_SYSTEM)
 469                                 syslog(LOG_ERR, "%s", strerror(errno));
 470                         exit(1);
 471                 }
 472                 if (res->ai_addr == NULL) {
 473                         syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
 474                         exit(1);
 475                 } else
 476                         family = res->ai_addr->sa_family;
 477                 /*
 478                  * Open a socket, bind it to the FTP port, and start
 479                  * listening.
 480                  */
 481                 ctl_sock = socket(family, SOCK_STREAM, 0);
 482                 if (ctl_sock < 0) {
 483                         syslog(LOG_ERR, "control socket: %m");
 484                         exit(1);
 485                 }
 486                 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR,
 487                     &on, sizeof(on)) < 0)
 488                         syslog(LOG_WARNING,
 489                                "control setsockopt (SO_REUSEADDR): %m");
 490                 if (family == AF_INET6 && enable_v4 == 0) {
 491                         if (setsockopt(ctl_sock, IPPROTO_IPV6, IPV6_V6ONLY,
 492                                        &on, sizeof (on)) < 0)
 493                                 syslog(LOG_WARNING,
 494                                        "control setsockopt (IPV6_V6ONLY): %m");
 495                 }
 496                 memcpy(&server_addr, res->ai_addr, res->ai_addr->sa_len);
 497                 if (bind(ctl_sock, (struct sockaddr *)&server_addr,
 498                          server_addr.su_len) < 0) {
 499                         syslog(LOG_ERR, "control bind: %m");
 500                         exit(1);
 501                 }
 502                 if (listen(ctl_sock, 32) < 0) {
 503                         syslog(LOG_ERR, "control listen: %m");
 504                         exit(1);
 505                 }
 506                 /*
 507                  * Atomically write process ID
 508                  */
 509                 if (pid_file)
 510                 {
 511                         int fd;
 512                         char buf[20];
 513
 514                         fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC
 515                                 | O_NONBLOCK | O_EXLOCK, 0644);
 516                         if (fd < 0) {
 517                                 if (errno == EAGAIN)
 518                                         errx(1, "%s: file locked", pid_file);
 519                                 else
 520                                         err(1, "%s", pid_file);
 521                         }
 522                         snprintf(buf, sizeof(buf),
 523                                 "%lu\n", (unsigned long) getpid());
 524                         if (write(fd, buf, strlen(buf)) < 0)
 525                                 err(1, "%s: write", pid_file);
 526                         /* Leave the pid file open and locked */
 527                 }
 528                 /*
 529                  * Loop forever accepting connection requests and forking off
 530                  * children to handle them.
 531                  */
 532                 while (1) {
 533                         addrlen = server_addr.su_len;
 534                         fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen);
 535
 536                         if (fd >= 0) {
 537                                 if (fork() == 0) {
 538                                         /* child */
 539                                         (void) dup2(fd, 0);
 540                                         (void) dup2(fd, 1);
 541                                         close(ctl_sock);
 542                                         break;
 543                                 }
 544                                 close(fd);
 545                         }
 546                 }
 547         } else {
 548                 addrlen = sizeof(his_addr);
 549                 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
 550                         syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
 551                         exit(1);
 552                 }
 553         }
 554
 555         sa.sa_handler = SIG_DFL;
 556         (void)sigaction(SIGCHLD, &sa, NULL);
 557
 558         sa.sa_handler = sigurg;
 559         sa.sa_flags = 0;                /* don't restart syscalls for SIGURG */
 560         (void)sigaction(SIGURG, &sa, NULL);
 561
 562         sigfillset(&sa.sa_mask);        /* block all signals in handler */
 563         sa.sa_flags = SA_RESTART;
 564         sa.sa_handler = sigquit;
 565         (void)sigaction(SIGHUP, &sa, NULL);
 566         (void)sigaction(SIGINT, &sa, NULL);
 567         (void)sigaction(SIGQUIT, &sa, NULL);
 568         (void)sigaction(SIGTERM, &sa, NULL);
 569
 570         sa.sa_handler = lostconn;
 571         (void)sigaction(SIGPIPE, &sa, NULL);
 572
 573         addrlen = sizeof(ctrl_addr);
 574         if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
 575                 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
 576                 exit(1);
 577         }
 578         dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */
 579 #ifdef VIRTUAL_HOSTING
 580         /* select our identity from virtual host table */
 581         selecthost(&ctrl_addr);
 582 #endif
 583 #ifdef IP_TOS
 584         if (ctrl_addr.su_family == AF_INET)
 585       {
 586         tos = IPTOS_LOWDELAY;
 587         if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
 588                 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m");
 589       }
 590 #endif
 591         /*
 592          * Disable Nagle on the control channel so that we don't have to wait
 593          * for peer's ACK before issuing our next reply.
 594          */
 595         if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
 596                 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m");
 597
 598         data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1);
 599
 600         /* set this here so klogin can use it... */
 601         (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid());
 602
 603         /* Try to handle urgent data inline */
 604 #ifdef SO_OOBINLINE
 605         if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0)
 606                 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m");
 607 #endif
 608
 609 #ifdef  F_SETOWN
 610         if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
 611                 syslog(LOG_ERR, "fcntl F_SETOWN: %m");
 612 #endif
 613         dolog((struct sockaddr *)&his_addr);
 614         /*
 615          * Set up default state
 616          */
 617         data = -1;
 618         type = TYPE_A;
 619         form = FORM_N;
 620         stru = STRU_F;
 621         mode = MODE_S;
 622         tmpline[0] = '\0';
 623
 624         /* If logins are disabled, print out the message. */
 625         if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
 626                 while (fgets(line, sizeof(line), fd) != NULL) {
 627                         if ((cp = strchr(line, '\n')) != NULL)
 628                                 *cp = '\0';
 629                         lreply(530, "%s", line);
 630                 }
 631                 (void) fflush(stdout);
 632                 (void) fclose(fd);
 633                 reply(530, "System not available.");
 634                 exit(0);
 635         }
 636 #ifdef VIRTUAL_HOSTING
 637         if ((fd = fopen(thishost->welcome, "r")) != NULL) {
 638 #else
 639         if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) {
 640 #endif
 641                 while (fgets(line, sizeof(line), fd) != NULL) {
 642                         if ((cp = strchr(line, '\n')) != NULL)
 643                                 *cp = '\0';
 644                         lreply(220, "%s", line);
 645                 }
 646                 (void) fflush(stdout);
 647                 (void) fclose(fd);
 648                 /* reply(220,) must follow */
 649         }
 650 #ifndef VIRTUAL_HOSTING
 651         if (hostname == NULL) {
 652                 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
 653                         fatalerror("Ran out of memory.");
 654                 gethostname(hostname, MAXHOSTNAMELEN - 1);
 655                 hostname[MAXHOSTNAMELEN - 1] = '\0';
 656         }
 657 #endif
 658         if (hostinfo)
 659                 reply(220, "%s FTP server (%s) ready.", hostname, version);
 660         else
 661                 reply(220, "FTP server ready.");
 662         for (;;)
 663                 (void) yyparse();
 664         /* NOTREACHED */
 665 }
 666
 667 static void
 668 lostconn(signo)
 669         int signo;
 670 {
 671
 672         if (ftpdebug)
 673                 syslog(LOG_DEBUG, "lost connection");
 674         dologout(1);
 675 }
 676
 677 static void
 678 sigquit(signo)
 679         int signo;
 680 {
 681
 682         syslog(LOG_ERR, "got signal %d", signo);
 683         dologout(1);
 684 }
 685
 686 #ifdef VIRTUAL_HOSTING
 687 /*
 688  * read in virtual host tables (if they exist)
 689  */
 690
 691 static void
 692 inithosts()
 693 {
 694         int insert;
 695         size_t len;
 696         FILE *fp;
 697         char *cp, *mp, *line;
 698         char *vhost, *anonuser, *statfile, *welcome, *loginmsg;
 699         struct ftphost *hrp, *lhrp;
 700         struct addrinfo hints, *res, *ai;
 701
 702         /*
 703          * Fill in the default host information
 704          */
 705         if (hostname == NULL) {
 706                 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
 707                         fatalerror("Ran out of memory.");
 708                 if (gethostname(hostname, MAXHOSTNAMELEN) < 0)
 709                         hostname[0] = '\0';
 710                 hostname[MAXHOSTNAMELEN - 1] = '\0';
 711         }
 712         if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
 713                 fatalerror("Ran out of memory.");
 714         hrp->hostname = hostname;
 715         hrp->hostinfo = NULL;
 716
 717         memset(&hints, 0, sizeof(hints));
 718         hints.ai_flags = AI_CANONNAME;
 719         hints.ai_family = AF_UNSPEC;
 720         if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0)
 721                 hrp->hostinfo = res;
 722         hrp->statfile = _PATH_FTPDSTATFILE;
 723         hrp->welcome  = _PATH_FTPWELCOME;
 724         hrp->loginmsg = _PATH_FTPLOGINMESG;
 725         hrp->anonuser = "ftp";
 726         hrp->next = NULL;
 727         thishost = firsthost = lhrp = hrp;
 728         if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) {
 729                 int addrsize, gothost;
 730                 void *addr;
 731                 struct hostent *hp;
 732
 733                 while ((line = fgetln(fp, &len)) != NULL) {
 734                         int     i, hp_error;
 735
 736                         /* skip comments */
 737                         if (line[0] == '#')
 738                                 continue;
 739                         if (line[len - 1] == '\n') {
 740                                 line[len - 1] = '\0';
 741                                 mp = NULL;
 742                         } else {
 743                                 if ((mp = malloc(len + 1)) == NULL)
 744                                         fatalerror("Ran out of memory.");
 745                                 memcpy(mp, line, len);
 746                                 mp[len] = '\0';
 747                                 line = mp;
 748                         }
 749                         cp = strtok(line, " \t");
 750                         /* skip empty lines */
 751                         if (cp == NULL)
 752                                 goto nextline;
 753                         vhost = cp;
 754
 755                         /* set defaults */
 756                         anonuser = "ftp";
 757                         statfile = _PATH_FTPDSTATFILE;
 758                         welcome  = _PATH_FTPWELCOME;
 759                         loginmsg = _PATH_FTPLOGINMESG;
 760
 761                         /*
 762                          * Preparse the line so we can use its info
 763                          * for all the addresses associated with
 764                          * the virtual host name.
 765                          * Field 0, the virtual host name, is special:
 766                          * it's already parsed off and will be strdup'ed
 767                          * later, after we know its canonical form.
 768                          */
 769                         for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++)
 770                                 if (*cp != '-' && (cp = strdup(cp)))
 771                                         switch (i) {
 772                                         case 1: /* anon user permissions */
 773                                                 anonuser = cp;
 774                                                 break;
 775                                         case 2: /* statistics file */
 776                                                 statfile = cp;
 777                                                 break;
 778                                         case 3: /* welcome message */
 779                                                 welcome  = cp;
 780                                                 break;
 781                                         case 4: /* login message */
 782                                                 loginmsg = cp;
 783                                                 break;
 784                                         default: /* programming error */
 785                                                 abort();
 786                                                 /* NOTREACHED */
 787                                         }
 788
 789                         hints.ai_flags = 0;
 790                         hints.ai_family = AF_UNSPEC;
 791                         hints.ai_flags = AI_PASSIVE;
 792                         if (getaddrinfo(vhost, NULL, &hints, &res) != 0)
 793                                 goto nextline;
 794                         for (ai = res; ai != NULL && ai->ai_addr != NULL;
 795                              ai = ai->ai_next) {
 796
 797                         gothost = 0;
 798                         for (hrp = firsthost; hrp != NULL; hrp = hrp->next) {
 799                                 struct addrinfo *hi;
 800
 801                                 for (hi = hrp->hostinfo; hi != NULL;
 802                                      hi = hi->ai_next)
 803                                         if (hi->ai_addrlen == ai->ai_addrlen &&
 804                                             memcmp(hi->ai_addr,
 805                                                    ai->ai_addr,
 806                                                    ai->ai_addr->sa_len) == 0) {
 807                                                 gothost++;
 808                                                 break;
 809                                         }
 810                                 if (gothost)
 811                                         break;
 812                         }
 813                         if (hrp == NULL) {
 814                                 if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
 815                                         goto nextline;
 816                                 hrp->hostname = NULL;
 817                                 insert = 1;
 818                         } else {
 819                                 if (hrp->hostinfo && hrp->hostinfo != res)
 820                                         freeaddrinfo(hrp->hostinfo);
 821                                 insert = 0; /* host already in the chain */
 822                         }
 823                         hrp->hostinfo = res;
 824
 825                         /*
 826                          * determine hostname to use.
 827                          * force defined name if there is a valid alias
 828                          * otherwise fallback to primary hostname
 829                          */
 830                         /* XXX: getaddrinfo() can't do alias check */
 831                         switch(hrp->hostinfo->ai_family) {
 832                         case AF_INET:
 833                                 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr;
 834                                 addrsize = sizeof(struct in_addr);
 835                                 break;
 836                         case AF_INET6:
 837                                 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr;
 838                                 addrsize = sizeof(struct in6_addr);
 839                                 break;
 840                         default:
 841                                 /* should not reach here */
 842                                 freeaddrinfo(hrp->hostinfo);
 843                                 if (insert)
 844                                         free(hrp); /*not in chain, can free*/
 845                                 else
 846                                         hrp->hostinfo = NULL; /*mark as blank*/
 847                                 goto nextline;
 848                                 /* NOTREACHED */
 849                         }
 850                         if ((hp = getipnodebyaddr(addr, addrsize,
 851                                                   hrp->hostinfo->ai_family,
 852                                                   &hp_error)) != NULL) {
 853                                 if (strcmp(vhost, hp->h_name) != 0) {
 854                                         if (hp->h_aliases == NULL)
 855                                                 vhost = hp->h_name;
 856                                         else {
 857                                                 i = 0;
 858                                                 while (hp->h_aliases[i] &&
 859                                                        strcmp(vhost, hp->h_aliases[i]) != 0)
 860                                                         ++i;
 861                                                 if (hp->h_aliases[i] == NULL)
 862                                                         vhost = hp->h_name;
 863                                         }
 864                                 }
 865                         }
 866                         if (hrp->hostname &&
 867                             strcmp(hrp->hostname, vhost) != 0) {
 868                                 free(hrp->hostname);
 869                                 hrp->hostname = NULL;
 870                         }
 871                         if (hrp->hostname == NULL &&
 872                             (hrp->hostname = strdup(vhost)) == NULL) {
 873                                 freeaddrinfo(hrp->hostinfo);
 874                                 hrp->hostinfo = NULL; /* mark as blank */
 875                                 if (hp)
 876                                         freehostent(hp);
 877                                 goto nextline;
 878                         }
 879                         hrp->anonuser = anonuser;
 880                         hrp->statfile = statfile;
 881                         hrp->welcome  = welcome;
 882                         hrp->loginmsg = loginmsg;
 883                         if (insert) {
 884                                 hrp->next  = NULL;
 885                                 lhrp->next = hrp;
 886                                 lhrp = hrp;
 887                         }
 888                         if (hp)
 889                                 freehostent(hp);
 890                       }
 891 nextline:
 892                         if (mp)
 893                                 free(mp);
 894                 }
 895                 (void) fclose(fp);
 896         }
 897 }
 898
 899 static void
 900 selecthost(su)
 901         union sockunion *su;
 902 {
 903         struct ftphost  *hrp;
 904         u_int16_t port;
 905 #ifdef INET6
 906         struct in6_addr *mapped_in6 = NULL;
 907 #endif
 908         struct addrinfo *hi;
 909
 910 #ifdef INET6
 911         /*
 912          * XXX IPv4 mapped IPv6 addr consideraton,
 913          * specified in rfc2373.
 914          */
 915         if (su->su_family == AF_INET6 &&
 916             IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr))
 917                 mapped_in6 = &su->su_sin6.sin6_addr;
 918 #endif
 919
 920         hrp = thishost = firsthost;     /* default */
 921         port = su->su_port;
 922         su->su_port = 0;
 923         while (hrp != NULL) {
 924             for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) {
 925                 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) {
 926                         thishost = hrp;
 927                         break;
 928                 }
 929 #ifdef INET6
 930                 /* XXX IPv4 mapped IPv6 addr consideraton */
 931                 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL &&
 932                     (memcmp(&mapped_in6->s6_addr[12],
 933                             &((struct sockaddr_in *)hi->ai_addr)->sin_addr,
 934                             sizeof(struct in_addr)) == 0)) {
 935                         thishost = hrp;
 936                         break;
 937                 }
 938 #endif
 939             }
 940             hrp = hrp->next;
 941         }
 942         su->su_port = port;
 943         /* setup static variables as appropriate */
 944         hostname = thishost->hostname;
 945         ftpuser = thishost->anonuser;
 946 }
 947 #endif
 948
 949 /*
 950  * Helper function for sgetpwnam().
 951  */
 952 static char *
 953 sgetsave(s)
 954         char *s;
 955 {
 956         char *new = malloc((unsigned) strlen(s) + 1);
 957
 958         if (new == NULL) {
 959                 perror_reply(421, "Local resource failure: malloc");
 960                 dologout(1);
 961                 /* NOTREACHED */
 962         }
 963         (void) strcpy(new, s);
 964         return (new);
 965 }
 966
 967 /*
 968  * Save the result of a getpwnam.  Used for USER command, since
 969  * the data returned must not be clobbered by any other command
 970  * (e.g., globbing).
 971  */
 972 static struct passwd *
 973 sgetpwnam(name)
 974         char *name;
 975 {
 976         static struct passwd save;
 977         struct passwd *p;
 978
 979         if ((p = getpwnam(name)) == NULL)
 980                 return (p);
 981         if (save.pw_name) {
 982                 free(save.pw_name);
 983                 free(save.pw_passwd);
 984                 free(save.pw_gecos);
 985                 free(save.pw_dir);
 986                 free(save.pw_shell);
 987         }
 988         save = *p;
 989         save.pw_name = sgetsave(p->pw_name);
 990         save.pw_passwd = sgetsave(p->pw_passwd);
 991         save.pw_gecos = sgetsave(p->pw_gecos);
 992         save.pw_dir = sgetsave(p->pw_dir);
 993         save.pw_shell = sgetsave(p->pw_shell);
 994         return (&save);
 995 }
 996
 997 static int login_attempts;      /* number of failed login attempts */
 998 static int askpasswd;           /* had user command, ask for passwd */
 999 static char curname[MAXLOGNAME];        /* current USER name */
1000
1001 /*
1002  * USER command.
1003  * Sets global passwd pointer pw if named account exists and is acceptable;
1004  * sets askpasswd if a PASS command is expected.  If logged in previously,
1005  * need to reset state.  If name is "ftp" or "anonymous", the name is not in
1006  * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
1007  * If account doesn't exist, ask for passwd anyway.  Otherwise, check user
1008  * requesting login privileges.  Disallow anyone who does not have a standard
1009  * shell as returned by getusershell().  Disallow anyone mentioned in the file
1010  * _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
1011  */
1012 void
1013 user(name)
1014         char *name;
1015 {
1016         char *cp, *shell;
1017
1018         if (logged_in) {
1019                 if (guest) {
1020                         reply(530, "Can't change user from guest login.");
1021                         return;
1022                 } else if (dochroot) {
1023                         reply(530, "Can't change user from chroot user.");
1024                         return;
1025                 }
1026                 end_login();
1027         }
1028
1029         guest = 0;
1030         if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
1031                 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) ||
1032                     checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL))
1033                         reply(530, "User %s access denied.", name);
1034 #ifdef VIRTUAL_HOSTING
1035                 else if ((pw = sgetpwnam(thishost->anonuser)) != NULL) {
1036 #else
1037                 else if ((pw = sgetpwnam("ftp")) != NULL) {
1038 #endif
1039                         guest = 1;
1040                         askpasswd = 1;
1041                         reply(331,
1042                         "Guest login ok, send your email address as password.");
1043                 } else
1044                         reply(530, "User %s unknown.", name);
1045                 if (!askpasswd && logging)
1046                         syslog(LOG_NOTICE,
1047                             "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
1048                 return;
1049         }
1050         if (anon_only != 0) {
1051                 reply(530, "Sorry, only anonymous ftp allowed.");
1052                 return;
1053         }
1054
1055         if ((pw = sgetpwnam(name))) {
1056                 if ((shell = pw->pw_shell) == NULL || *shell == 0)
1057                         shell = _PATH_BSHELL;
1058                 while ((cp = getusershell()) != NULL)
1059                         if (strcmp(cp, shell) == 0)
1060                                 break;
1061                 endusershell();
1062
1063                 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) {
1064                         reply(530, "User %s access denied.", name);
1065                         if (logging)
1066                                 syslog(LOG_NOTICE,
1067                                     "FTP LOGIN REFUSED FROM %s, %s",
1068                                     remotehost, name);
1069                         pw = (struct passwd *) NULL;
1070                         return;
1071                 }
1072         }
1073         if (logging)
1074                 strncpy(curname, name, sizeof(curname)-1);
1075 #ifdef SKEY
1076         pwok = skeyaccess(name, NULL, remotehost, remotehost);
1077         reply(331, "%s", skey_challenge(name, pw, pwok));
1078 #else
1079         reply(331, "Password required for %s.", name);
1080 #endif
1081         askpasswd = 1;
1082         /*
1083          * Delay before reading passwd after first failed
1084          * attempt to slow down passwd-guessing programs.
1085          */
1086         if (login_attempts)
1087                 sleep((unsigned) login_attempts);
1088 }
1089
1090 /*
1091  * Check if a user is in the file "fname",
1092  * return a pointer to a malloc'd string with the rest
1093  * of the matching line in "residue" if not NULL.
1094  */
1095 static int
1096 checkuser(fname, name, pwset, residue)
1097         char *fname;
1098         char *name;
1099         int pwset;
1100         char **residue;
1101 {
1102         FILE *fd;
1103         int found = 0;
1104         size_t len;
1105         char *line, *mp, *p;
1106
1107         if ((fd = fopen(fname, "r")) != NULL) {
1108                 while (!found && (line = fgetln(fd, &len)) != NULL) {
1109                         /* skip comments */
1110                         if (line[0] == '#')
1111                                 continue;
1112                         if (line[len - 1] == '\n') {
1113                                 line[len - 1] = '\0';
1114                                 mp = NULL;
1115                         } else {
1116                                 if ((mp = malloc(len + 1)) == NULL)
1117                                         fatalerror("Ran out of memory.");
1118                                 memcpy(mp, line, len);
1119                                 mp[len] = '\0';
1120                                 line = mp;
1121                         }
1122                         /* avoid possible leading and trailing whitespace */
1123                         p = strtok(line, " \t");
1124                         /* skip empty lines */
1125                         if (p == NULL)
1126                                 goto nextline;
1127                         /*
1128                          * if first chr is '@', check group membership
1129                          */
1130                         if (p[0] == '@') {
1131                                 int i = 0;
1132                                 struct group *grp;
1133
1134                                 if (p[1] == '\0') /* single @ matches anyone */
1135                                         found = 1;
1136                                 else {
1137                                         if ((grp = getgrnam(p+1)) == NULL)
1138                                                 goto nextline;
1139                                         /*
1140                                          * Check user's default group
1141                                          */
1142                                         if (pwset && grp->gr_gid == pw->pw_gid)
1143                                                 found = 1;
1144                                         /*
1145                                          * Check supplementary groups
1146                                          */
1147                                         while (!found && grp->gr_mem[i])
1148                                                 found = strcmp(name,
1149                                                         grp->gr_mem[i++])
1150                                                         == 0;
1151                                 }
1152                         }
1153                         /*
1154                          * Otherwise, just check for username match
1155                          */
1156                         else
1157                                 found = strcmp(p, name) == 0;
1158                         /*
1159                          * Save the rest of line to "residue" if matched
1160                          */
1161                         if (found && residue) {
1162                                 if ((p = strtok(NULL, "")) != NULL)
1163                                         p += strspn(p, " \t");
1164                                 if (p && *p) {
1165                                         if ((*residue = strdup(p)) == NULL)
1166                                                 fatalerror("Ran out of memory.");
1167                                 } else
1168                                         *residue = NULL;
1169                         }
1170 nextline:
1171                         if (mp)
1172                                 free(mp);
1173                 }
1174                 (void) fclose(fd);
1175         }
1176         return (found);
1177 }
1178
1179 /*
1180  * Terminate login as previous user, if any, resetting state;
1181  * used when USER command is given or login fails.
1182  */
1183 static void
1184 end_login()
1185 {
1186
1187         (void) seteuid((uid_t)0);
1188         if (logged_in && dowtmp)
1189                 ftpd_logwtmp(ttyline, "", NULL);
1190         pw = NULL;
1191 #ifdef  LOGIN_CAP
1192         setusercontext(NULL, getpwuid(0), (uid_t)0,
1193                        LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK);
1194 #endif
1195         logged_in = 0;
1196         guest = 0;
1197         dochroot = 0;
1198 }
1199
1200 #if !defined(NOPAM)
1201
1202 /*
1203  * the following code is stolen from imap-uw PAM authentication module and
1204  * login.c
1205  */
1206 #define COPY_STRING(s) (s ? strdup(s) : NULL)
1207
1208 struct cred_t {
1209         const char *uname;              /* user name */
1210         const char *pass;               /* password */
1211 };
1212 typedef struct cred_t cred_t;
1213
1214 static int
1215 auth_conv(int num_msg, const struct pam_message **msg,
1216           struct pam_response **resp, void *appdata)
1217 {
1218         int i;
1219         cred_t *cred = (cred_t *) appdata;
1220         struct pam_response *reply =
1221                         malloc(sizeof(struct pam_response) * num_msg);
1222
1223         for (i = 0; i < num_msg; i++) {
1224                 switch (msg[i]->msg_style) {
1225                 case PAM_PROMPT_ECHO_ON:        /* assume want user name */
1226                         reply[i].resp_retcode = PAM_SUCCESS;
1227                         reply[i].resp = COPY_STRING(cred->uname);
1228                         /* PAM frees resp. */
1229                         break;
1230                 case PAM_PROMPT_ECHO_OFF:       /* assume want password */
1231                         reply[i].resp_retcode = PAM_SUCCESS;
1232                         reply[i].resp = COPY_STRING(cred->pass);
1233                         /* PAM frees resp. */
1234                         break;
1235                 case PAM_TEXT_INFO:
1236                 case PAM_ERROR_MSG:
1237                         reply[i].resp_retcode = PAM_SUCCESS;
1238                         reply[i].resp = NULL;
1239                         break;
1240                 default:                        /* unknown message style */
1241                         free(reply);
1242                         return PAM_CONV_ERR;
1243                 }
1244         }
1245
1246         *resp = reply;
1247         return PAM_SUCCESS;
1248 }
1249
1250 /*
1251  * Attempt to authenticate the user using PAM.  Returns 0 if the user is
1252  * authenticated, or 1 if not authenticated.  If some sort of PAM system
1253  * error occurs (e.g., the "/etc/pam.conf" file is missing) then this
1254  * function returns -1.  This can be used as an indication that we should
1255  * fall back to a different authentication mechanism.
1256  */
1257 static int
1258 auth_pam(struct passwd **ppw, const char *pass)
1259 {
1260         pam_handle_t *pamh = NULL;
1261         const char *tmpl_user;
1262         const void *item;
1263         int rval;
1264         int e;
1265         cred_t auth_cred = { (*ppw)->pw_name, pass };
1266         struct pam_conv conv = { &auth_conv, &auth_cred };
1267
1268         e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh);
1269         if (e != PAM_SUCCESS) {
1270                 syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e));
1271                 return -1;
1272         }
1273
1274         e = pam_set_item(pamh, PAM_RHOST, remotehost);
1275         if (e != PAM_SUCCESS) {
1276                 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
1277                         pam_strerror(pamh, e));
1278                 return -1;
1279         }
1280
1281         e = pam_authenticate(pamh, 0);
1282         switch (e) {
1283         case PAM_SUCCESS:
1284                 /*
1285                  * With PAM we support the concept of a "template"
1286                  * user.  The user enters a login name which is
1287                  * authenticated by PAM, usually via a remote service
1288                  * such as RADIUS or TACACS+.  If authentication
1289                  * succeeds, a different but related "template" name
1290                  * is used for setting the credentials, shell, and
1291                  * home directory.  The name the user enters need only
1292                  * exist on the remote authentication server, but the
1293                  * template name must be present in the local password
1294                  * database.
1295                  *
1296                  * This is supported by two various mechanisms in the
1297                  * individual modules.  However, from the application's
1298                  * point of view, the template user is always passed
1299                  * back as a changed value of the PAM_USER item.
1300                  */
1301                 if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
1302                     PAM_SUCCESS) {
1303                         tmpl_user = (const char *) item;
1304                         if (strcmp((*ppw)->pw_name, tmpl_user) != 0)
1305                                 *ppw = getpwnam(tmpl_user);
1306                 } else
1307                         syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
1308                             pam_strerror(pamh, e));
1309                 rval = 0;
1310                 break;
1311
1312         case PAM_AUTH_ERR:
1313         case PAM_USER_UNKNOWN:
1314         case PAM_MAXTRIES:
1315                 rval = 1;
1316                 break;
1317
1318         default:
1319                 syslog(LOG_ERR, "auth_pam: %s", pam_strerror(pamh, e));
1320                 rval = -1;
1321                 break;
1322         }
1323
1324         if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
1325                 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1326                 rval = -1;
1327         }
1328         return rval;
1329 }
1330
1331 #endif /* !defined(NOPAM) */
1332
1333 void
1334 pass(passwd)
1335         char *passwd;
1336 {
1337         int rval;
1338         FILE *fd;
1339 #ifdef  LOGIN_CAP
1340         login_cap_t *lc = NULL;
1341 #endif
1342         char *chrootdir;
1343         char *residue = NULL;
1344
1345         if (logged_in || askpasswd == 0) {
1346                 reply(503, "Login with USER first.");
1347                 return;
1348         }
1349         askpasswd = 0;
1350         if (!guest) {           /* "ftp" is only account allowed no password */
1351                 if (pw == NULL) {
1352                         rval = 1;       /* failure below */
1353                         goto skip;
1354                 }
1355 #if !defined(NOPAM)
1356                 rval = auth_pam(&pw, passwd);
1357                 if (rval >= 0)
1358                         goto skip;
1359 #endif
1360 #ifdef SKEY
1361                 if (pwok)
1362                         rval = strcmp(pw->pw_passwd,
1363                             crypt(passwd, pw->pw_passwd));
1364                 if (rval)
1365                         rval = strcmp(pw->pw_passwd,
1366                             skey_crypt(passwd, pw->pw_passwd, pw, pwok));
1367 #else
1368                 rval = strcmp(pw->pw_passwd, crypt(passwd, pw->pw_passwd));
1369 #endif
1370                 /* The strcmp does not catch null passwords! */
1371                 if (*pw->pw_passwd == '\0' ||
1372                     (pw->pw_expire && time(NULL) >= pw->pw_expire))
1373                         rval = 1;       /* failure */
1374 skip:
1375                 /*
1376                  * If rval == 1, the user failed the authentication check
1377                  * above.  If rval == 0, either PAM or local authentication
1378                  * succeeded.
1379                  */
1380                 if (rval) {
1381                         reply(530, "Login incorrect.");
1382                         if (logging) {
1383                                 syslog(LOG_NOTICE,
1384                                     "FTP LOGIN FAILED FROM %s",
1385                                     remotehost);
1386                                 syslog(LOG_AUTHPRIV | LOG_NOTICE,
1387                                     "FTP LOGIN FAILED FROM %s, %s",
1388                                     remotehost, curname);
1389                         }
1390                         pw = NULL;
1391                         if (login_attempts++ >= 5) {
1392                                 syslog(LOG_NOTICE,
1393                                     "repeated login failures from %s",
1394                                     remotehost);
1395                                 exit(0);
1396                         }
1397                         return;
1398                 }
1399         }
1400 #ifdef SKEY
1401         pwok = 0;
1402 #endif
1403         login_attempts = 0;             /* this time successful */
1404         if (setegid((gid_t)pw->pw_gid) < 0) {
1405                 reply(550, "Can't set gid.");
1406                 return;
1407         }
1408         /* May be overridden by login.conf */
1409         (void) umask(defumask);
1410 #ifdef  LOGIN_CAP
1411         if ((lc = login_getpwclass(pw)) != NULL) {
1412                 char    remote_ip[MAXHOSTNAMELEN];
1413
1414                 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
1415                         remote_ip, sizeof(remote_ip) - 1, NULL, 0,
1416                         NI_NUMERICHOST);
1417                 remote_ip[sizeof(remote_ip) - 1] = 0;
1418                 if (!auth_hostok(lc, remotehost, remote_ip)) {
1419                         syslog(LOG_INFO|LOG_AUTH,
1420                             "FTP LOGIN FAILED (HOST) as %s: permission denied.",
1421                             pw->pw_name);
1422                         reply(530, "Permission denied.\n");
1423                         pw = NULL;
1424                         return;
1425                 }
1426                 if (!auth_timeok(lc, time(NULL))) {
1427                         reply(530, "Login not available right now.\n");
1428                         pw = NULL;
1429                         return;
1430                 }
1431         }
1432         setusercontext(lc, pw, (uid_t)0,
1433                 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY|
1434                 LOGIN_SETRESOURCES|LOGIN_SETUMASK);
1435 #else
1436         setlogin(pw->pw_name);
1437         (void) initgroups(pw->pw_name, pw->pw_gid);
1438 #endif
1439
1440         /* open wtmp before chroot */
1441         if (dowtmp)
1442                 ftpd_logwtmp(ttyline, pw->pw_name,
1443                     (struct sockaddr *)&his_addr);
1444         logged_in = 1;
1445
1446         if (guest && stats && statfd < 0)
1447 #ifdef VIRTUAL_HOSTING
1448                 if ((statfd = open(thishost->statfile, O_WRONLY|O_APPEND)) < 0)
1449 #else
1450                 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0)
1451 #endif
1452                         stats = 0;
1453
1454         dochroot =
1455                 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue)
1456 #ifdef  LOGIN_CAP       /* Allow login.conf configuration as well */
1457                 || login_getcapbool(lc, "ftp-chroot", 0)
1458 #endif
1459         ;
1460         chrootdir = NULL;
1461         /*
1462          * For a chrooted local user,
1463          * a) see whether ftpchroot(5) specifies a chroot directory,
1464          * b) extract the directory pathname from the line,
1465          * c) expand it to the absolute pathname if necessary.
1466          */
1467         if (dochroot && residue &&
1468             (chrootdir = strtok(residue, " \t")) != NULL &&
1469             chrootdir[0] != '/') {
1470                 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir);
1471                 if (chrootdir == NULL)
1472                         fatalerror("Ran out of memory.");
1473         }
1474         if (guest || dochroot) {
1475                 /*
1476                  * If no chroot directory set yet, use the login directory.
1477                  * Copy it so it can be modified while pw->pw_dir stays intact.
1478                  */
1479                 if (chrootdir == NULL &&
1480                     (chrootdir = strdup(pw->pw_dir)) == NULL)
1481                         fatalerror("Ran out of memory.");
1482                 /*
1483                  * Check for the "/chroot/./home" syntax,
1484                  * separate the chroot and home directory pathnames.
1485                  */
1486                 if ((homedir = strstr(chrootdir, "/./")) != NULL) {
1487                         *(homedir++) = '\0';    /* wipe '/' */
1488                         homedir++;              /* skip '.' */
1489                         /* so chrootdir can be freed later */
1490                         if ((homedir = strdup(homedir)) == NULL)
1491                                 fatalerror("Ran out of memory.");
1492                 } else {
1493                         /*
1494                          * We MUST do a chdir() after the chroot. Otherwise
1495                          * the old current directory will be accessible as "."
1496                          * outside the new root!
1497                          */
1498                         homedir = "/";
1499                 }
1500                 /*
1501                  * Finally, do chroot()
1502                  */
1503                 if (chroot(chrootdir) < 0) {
1504                         reply(550, "Can't change root.");
1505                         goto bad;
1506                 }
1507         } else  /* real user w/o chroot */
1508                 homedir = pw->pw_dir;
1509         /*
1510          * Set euid *before* doing chdir() so
1511          * a) the user won't be carried to a directory that he couldn't reach
1512          *    on his own due to no permission to upper path components,
1513          * b) NFS mounted homedirs w/restrictive permissions will be accessible
1514          *    (uid 0 has no root power over NFS if not mapped explicitly.)
1515          */
1516         if (seteuid((uid_t)pw->pw_uid) < 0) {
1517                 reply(550, "Can't set uid.");
1518                 goto bad;
1519         }
1520         if (chdir(homedir) < 0) {
1521                 if (guest || dochroot) {
1522                         reply(550, "Can't change to base directory.");
1523                         goto bad;
1524                 } else {
1525                         if (chdir("/") < 0) {
1526                                 reply(550, "Root is inaccessible.");
1527                                 goto bad;
1528                         }
1529                         lreply(230, "No directory! Logging in with home=/");
1530                 }
1531         }
1532
1533         /*
1534          * Display a login message, if it exists.
1535          * N.B. reply(230,) must follow the message.
1536          */
1537 #ifdef VIRTUAL_HOSTING
1538         if ((fd = fopen(thishost->loginmsg, "r")) != NULL) {
1539 #else
1540         if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) {
1541 #endif
1542                 char *cp, line[LINE_MAX];
1543
1544                 while (fgets(line, sizeof(line), fd) != NULL) {
1545                         if ((cp = strchr(line, '\n')) != NULL)
1546                                 *cp = '\0';
1547                         lreply(230, "%s", line);
1548                 }
1549                 (void) fflush(stdout);
1550                 (void) fclose(fd);
1551         }
1552         if (guest) {
1553                 if (ident != NULL)
1554                         free(ident);
1555                 ident = strdup(passwd);
1556                 if (ident == NULL)
1557                         fatalerror("Ran out of memory.");
1558
1559                 reply(230, "Guest login ok, access restrictions apply.");
1560 #ifdef SETPROCTITLE
1561 #ifdef VIRTUAL_HOSTING
1562                 if (thishost != firsthost)
1563                         snprintf(proctitle, sizeof(proctitle),
1564                                  "%s: anonymous(%s)/%s", remotehost, hostname,
1565                                  passwd);
1566                 else
1567 #endif
1568                         snprintf(proctitle, sizeof(proctitle),
1569                                  "%s: anonymous/%s", remotehost, passwd);
1570                 setproctitle("%s", proctitle);
1571 #endif /* SETPROCTITLE */
1572                 if (logging)
1573                         syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
1574                             remotehost, passwd);
1575         } else {
1576                 if (dochroot)
1577                         reply(230, "User %s logged in, "
1578                                    "access restrictions apply.", pw->pw_name);
1579                 else
1580                         reply(230, "User %s logged in.", pw->pw_name);
1581
1582 #ifdef SETPROCTITLE
1583                 snprintf(proctitle, sizeof(proctitle),
1584                          "%s: user/%s", remotehost, pw->pw_name);
1585                 setproctitle("%s", proctitle);
1586 #endif /* SETPROCTITLE */
1587                 if (logging)
1588                         syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
1589                             remotehost, pw->pw_name);
1590         }
1591 #ifdef  LOGIN_CAP
1592         login_close(lc);
1593 #endif
1594         if (chrootdir)
1595                 free(chrootdir);
1596         if (residue)
1597                 free(residue);
1598         return;
1599 bad:
1600         /* Forget all about it... */
1601 #ifdef  LOGIN_CAP
1602         login_close(lc);
1603 #endif
1604         if (chrootdir)
1605                 free(chrootdir);
1606         if (residue)
1607                 free(residue);
1608         end_login();
1609 }
1610
1611 void
1612 retrieve(cmd, name)
1613         char *cmd, *name;
1614 {
1615         FILE *fin, *dout;
1616         struct stat st;
1617         int (*closefunc) (FILE *);
1618         time_t start;
1619
1620         if (cmd == 0) {
1621                 fin = fopen(name, "r"), closefunc = fclose;
1622                 st.st_size = 0;
1623         } else {
1624                 char line[BUFSIZ];
1625
1626                 (void) snprintf(line, sizeof(line), cmd, name), name = line;
1627                 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
1628                 st.st_size = -1;
1629                 st.st_blksize = BUFSIZ;
1630         }
1631         if (fin == NULL) {
1632                 if (errno != 0) {
1633                         perror_reply(550, name);
1634                         if (cmd == 0) {
1635                                 LOGCMD("get", name);
1636                         }
1637                 }
1638                 return;
1639         }
1640         byte_count = -1;
1641         if (cmd == 0) {
1642                 if (fstat(fileno(fin), &st) < 0) {
1643                         perror_reply(550, name);
1644                         goto done;
1645                 }
1646                 if (!S_ISREG(st.st_mode)) {
1647                         if (guest) {
1648                                 reply(550, "%s: not a plain file.", name);
1649                                 goto done;
1650                         }
1651                         st.st_size = -1;
1652                         /* st.st_blksize is set for all descriptor types */
1653                 }
1654         }
1655         if (restart_point) {
1656                 if (type == TYPE_A) {
1657                         off_t i, n;
1658                         int c;
1659
1660                         n = restart_point;
1661                         i = 0;
1662                         while (i++ < n) {
1663                                 if ((c=getc(fin)) == EOF) {
1664                                         perror_reply(550, name);
1665                                         goto done;
1666                                 }
1667                                 if (c == '\n')
1668                                         i++;
1669                         }
1670                 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
1671                         perror_reply(550, name);
1672                         goto done;
1673                 }
1674         }
1675         dout = dataconn(name, st.st_size, "w");
1676         if (dout == NULL)
1677                 goto done;
1678         time(&start);
1679         send_data(fin, dout, st.st_blksize, st.st_size,
1680                   restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode));
1681         if (cmd == 0 && guest && stats)
1682                 logxfer(name, st.st_size, start);
1683         (void) fclose(dout);
1684         data = -1;
1685         pdata = -1;
1686 done:
1687         if (cmd == 0)
1688                 LOGBYTES("get", name, byte_count);
1689         (*closefunc)(fin);
1690 }
1691
1692 void
1693 store(name, mode, unique)
1694         char *name, *mode;
1695         int unique;
1696 {
1697         int fd;
1698         FILE *fout, *din;
1699         int (*closefunc) (FILE *);
1700
1701         if (*mode == 'a') {             /* APPE */
1702                 if (unique) {
1703                         /* Programming error */
1704                         syslog(LOG_ERR, "Internal: unique flag to APPE");
1705                         unique = 0;
1706                 }
1707                 if (guest && noguestmod) {
1708                         reply(550, "Appending to existing file denied");
1709                         goto err;
1710                 }
1711                 restart_point = 0;      /* not affected by preceding REST */
1712         }
1713         if (unique)                     /* STOU overrides REST */
1714                 restart_point = 0;
1715         if (guest && noguestmod) {
1716                 if (restart_point) {    /* guest STOR w/REST */
1717                         reply(550, "Modifying existing file denied");
1718                         goto err;
1719                 } else                  /* treat guest STOR as STOU */
1720                         unique = 1;
1721         }
1722
1723         if (restart_point)
1724                 mode = "r+";    /* so ASCII manual seek can work */
1725         if (unique) {
1726                 if ((fd = guniquefd(name, &name)) < 0)
1727                         goto err;
1728                 fout = fdopen(fd, mode);
1729         } else
1730                 fout = fopen(name, mode);
1731         closefunc = fclose;
1732         if (fout == NULL) {
1733                 perror_reply(553, name);
1734                 goto err;
1735         }
1736         byte_count = -1;
1737         if (restart_point) {
1738                 if (type == TYPE_A) {
1739                         off_t i, n;
1740                         int c;
1741
1742                         n = restart_point;
1743                         i = 0;
1744                         while (i++ < n) {
1745                                 if ((c=getc(fout)) == EOF) {
1746                                         perror_reply(550, name);
1747                                         goto done;
1748                                 }
1749                                 if (c == '\n')
1750                                         i++;
1751                         }
1752                         /*
1753                          * We must do this seek to "current" position
1754                          * because we are changing from reading to
1755                          * writing.
1756                          */
1757                         if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) {
1758                                 perror_reply(550, name);
1759                                 goto done;
1760                         }
1761                 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
1762                         perror_reply(550, name);
1763                         goto done;
1764                 }
1765         }
1766         din = dataconn(name, (off_t)-1, "r");
1767         if (din == NULL)
1768                 goto done;
1769         if (receive_data(din, fout) == 0) {
1770                 if (unique)
1771                         reply(226, "Transfer complete (unique file name:%s).",
1772                             name);
1773                 else
1774                         reply(226, "Transfer complete.");
1775         }
1776         (void) fclose(din);
1777         data = -1;
1778         pdata = -1;
1779 done:
1780         LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count);
1781         (*closefunc)(fout);
1782         return;
1783 err:
1784         LOGCMD(*mode == 'a' ? "append" : "put" , name);
1785         return;
1786 }
1787
1788 static FILE *
1789 getdatasock(mode)
1790         char *mode;
1791 {
1792         int on = 1, s, t, tries;
1793
1794         if (data >= 0)
1795                 return (fdopen(data, mode));
1796
1797         s = socket(data_dest.su_family, SOCK_STREAM, 0);
1798         if (s < 0)
1799                 goto bad;
1800         if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
1801                 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m");
1802         /* anchor socket to avoid multi-homing problems */
1803         data_source = ctrl_addr;
1804         data_source.su_port = htons(dataport);
1805         (void) seteuid((uid_t)0);
1806         for (tries = 1; ; tries++) {
1807                 if (bind(s, (struct sockaddr *)&data_source,
1808                     data_source.su_len) >= 0)
1809                         break;
1810                 if (errno != EADDRINUSE || tries > 10)
1811                         goto bad;
1812                 sleep(tries);
1813         }
1814         (void) seteuid((uid_t)pw->pw_uid);
1815 #ifdef IP_TOS
1816         if (data_source.su_family == AF_INET)
1817       {
1818         on = IPTOS_THROUGHPUT;
1819         if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0)
1820                 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m");
1821       }
1822 #endif
1823 #ifdef TCP_NOPUSH
1824         /*
1825          * Turn off push flag to keep sender TCP from sending short packets
1826          * at the boundaries of each write().  Should probably do a SO_SNDBUF
1827          * to set the send buffer size as well, but that may not be desirable
1828          * in heavy-load situations.
1829          */
1830         on = 1;
1831         if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0)
1832                 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m");
1833 #endif
1834 #ifdef SO_SNDBUF
1835         on = 65536;
1836         if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0)
1837                 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m");
1838 #endif
1839
1840         return (fdopen(s, mode));
1841 bad:
1842         /* Return the real value of errno (close may change it) */
1843         t = errno;
1844         (void) seteuid((uid_t)pw->pw_uid);
1845         (void) close(s);
1846         errno = t;
1847         return (NULL);
1848 }
1849
1850 static FILE *
1851 dataconn(name, size, mode)
1852         char *name;
1853         off_t size;
1854         char *mode;
1855 {
1856         char sizebuf[32];
1857         FILE *file;
1858         int retry = 0, tos, conerrno;
1859
1860         file_size = size;
1861         byte_count = 0;
1862         if (size != (off_t) -1)
1863                 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", size);
1864         else
1865                 *sizebuf = '\0';
1866         if (pdata >= 0) {
1867                 union sockunion from;
1868                 int flags;
1869                 int s, fromlen = ctrl_addr.su_len;
1870                 struct timeval timeout;
1871                 fd_set set;
1872
1873                 FD_ZERO(&set);
1874                 FD_SET(pdata, &set);
1875
1876                 timeout.tv_usec = 0;
1877                 timeout.tv_sec = 120;
1878
1879                 /*
1880                  * Granted a socket is in the blocking I/O mode,
1881                  * accept() will block after a successful select()
1882                  * if the selected connection dies in between.
1883                  * Therefore set the non-blocking I/O flag here.
1884                  */
1885                 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1886                     fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1)
1887                         goto pdata_err;
1888                 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) <= 0 ||
1889                     (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0)
1890                         goto pdata_err;
1891                 (void) close(pdata);
1892                 pdata = s;
1893                 /*
1894                  * Unset the inherited non-blocking I/O flag
1895                  * on the child socket so stdio can work on it.
1896                  */
1897                 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1898                     fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1)
1899                         goto pdata_err;
1900 #ifdef IP_TOS
1901                 if (from.su_family == AF_INET)
1902               {
1903                 tos = IPTOS_THROUGHPUT;
1904                 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
1905                         syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m");
1906               }
1907 #endif
1908                 reply(150, "Opening %s mode data connection for '%s'%s.",
1909                      type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1910                 return (fdopen(pdata, mode));
1911 pdata_err:
1912                 reply(425, "Can't open data connection.");
1913                 (void) close(pdata);
1914                 pdata = -1;
1915                 return (NULL);
1916         }
1917         if (data >= 0) {
1918                 reply(125, "Using existing data connection for '%s'%s.",
1919                     name, sizebuf);
1920                 usedefault = 1;
1921                 return (fdopen(data, mode));
1922         }
1923         if (usedefault)
1924                 data_dest = his_addr;
1925         usedefault = 1;
1926         do {
1927                 file = getdatasock(mode);
1928                 if (file == NULL) {
1929                         char hostbuf[BUFSIZ], portbuf[BUFSIZ];
1930                         getnameinfo((struct sockaddr *)&data_source,
1931                                 data_source.su_len, hostbuf, sizeof(hostbuf) - 1,
1932                                 portbuf, sizeof(portbuf),
1933                                 NI_NUMERICHOST|NI_NUMERICSERV);
1934                         reply(425, "Can't create data socket (%s,%s): %s.",
1935                                 hostbuf, portbuf, strerror(errno));
1936                         return (NULL);
1937                 }
1938                 data = fileno(file);
1939                 conerrno = 0;
1940                 if (connect(data, (struct sockaddr *)&data_dest,
1941                     data_dest.su_len) == 0)
1942                         break;
1943                 conerrno = errno;
1944                 (void) fclose(file);
1945                 data = -1;
1946                 if (conerrno == EADDRINUSE) {
1947                         sleep((unsigned) swaitint);
1948                         retry += swaitint;
1949                 } else {
1950                         break;
1951                 }
1952         } while (retry <= swaitmax);
1953         if (conerrno != 0) {
1954                 perror_reply(425, "Can't build data connection");
1955                 return (NULL);
1956         }
1957         reply(150, "Opening %s mode data connection for '%s'%s.",
1958              type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1959         return (file);
1960 }
1961
1962 /*
1963  * Tranfer the contents of "instr" to "outstr" peer using the appropriate
1964  * encapsulation of the data subject to Mode, Structure, and Type.
1965  *
1966  * NB: Form isn't handled.
1967  */
1968 static int
1969 send_data(instr, outstr, blksize, filesize, isreg)
1970         FILE *instr, *outstr;
1971         off_t blksize;
1972         off_t filesize;
1973         int isreg;
1974 {
1975         int c, filefd, netfd;
1976         char *buf;
1977         off_t cnt;
1978
1979         transflag++;
1980         switch (type) {
1981
1982         case TYPE_A:
1983                 while ((c = getc(instr)) != EOF) {
1984                         if (recvurg)
1985                                 goto got_oob;
1986                         byte_count++;
1987                         if (c == '\n') {
1988                                 if (ferror(outstr))
1989                                         goto data_err;
1990                                 (void) putc('\r', outstr);
1991                         }
1992                         (void) putc(c, outstr);
1993                 }
1994                 if (recvurg)
1995                         goto got_oob;
1996                 fflush(outstr);
1997                 transflag = 0;
1998                 if (ferror(instr))
1999                         goto file_err;
2000                 if (ferror(outstr))
2001                         goto data_err;
2002                 reply(226, "Transfer complete.");
2003                 return (0);
2004
2005         case TYPE_I:
2006         case TYPE_L:
2007                 /*
2008                  * isreg is only set if we are not doing restart and we
2009                  * are sending a regular file
2010                  */
2011                 netfd = fileno(outstr);
2012                 filefd = fileno(instr);
2013
2014                 if (isreg) {
2015
2016                         off_t offset;
2017                         int err;
2018
2019                         err = cnt = offset = 0;
2020
2021                         while (err != -1 && filesize > 0) {
2022                                 err = sendfile(filefd, netfd, offset, 0,
2023                                         (struct sf_hdtr *) NULL, &cnt, 0);
2024                                 /*
2025                                  * Calculate byte_count before OOB processing.
2026                                  * It can be used in myoob() later.
2027                                  */
2028                                 byte_count += cnt;
2029                                 if (recvurg)
2030                                         goto got_oob;
2031                                 offset += cnt;
2032                                 filesize -= cnt;
2033
2034                                 if (err == -1) {
2035                                         if (!cnt)
2036                                                 goto oldway;
2037
2038                                         goto data_err;
2039                                 }
2040                         }
2041
2042                         transflag = 0;
2043                         reply(226, "Transfer complete.");
2044                         return (0);
2045                 }
2046
2047 oldway:
2048                 if ((buf = malloc((u_int)blksize)) == NULL) {
2049                         transflag = 0;
2050                         perror_reply(451, "Local resource failure: malloc");
2051                         return (-1);
2052                 }
2053
2054                 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 &&
2055                     write(netfd, buf, cnt) == cnt)
2056                         byte_count += cnt;
2057                 transflag = 0;
2058                 (void)free(buf);
2059                 if (cnt != 0) {
2060                         if (cnt < 0)
2061                                 goto file_err;
2062                         goto data_err;
2063                 }
2064                 reply(226, "Transfer complete.");
2065                 return (0);
2066         default:
2067                 transflag = 0;
2068                 reply(550, "Unimplemented TYPE %d in send_data", type);
2069                 return (-1);
2070         }
2071
2072 data_err:
2073         transflag = 0;
2074         perror_reply(426, "Data connection");
2075         return (-1);
2076
2077 file_err:
2078         transflag = 0;
2079         perror_reply(551, "Error on input file");
2080         return (-1);
2081
2082 got_oob:
2083         myoob();
2084         recvurg = 0;
2085         transflag = 0;
2086         return (-1);
2087 }
2088
2089 /*
2090  * Transfer data from peer to "outstr" using the appropriate encapulation of
2091  * the data subject to Mode, Structure, and Type.
2092  *
2093  * N.B.: Form isn't handled.
2094  */
2095 static int
2096 receive_data(instr, outstr)
2097         FILE *instr, *outstr;
2098 {
2099         int c;
2100         int cnt, bare_lfs;
2101         char buf[BUFSIZ];
2102
2103         transflag++;
2104         bare_lfs = 0;
2105
2106         switch (type) {
2107
2108         case TYPE_I:
2109         case TYPE_L:
2110                 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) {
2111                         if (recvurg)
2112                                 goto got_oob;
2113                         if (write(fileno(outstr), buf, cnt) != cnt)
2114                                 goto file_err;
2115                         byte_count += cnt;
2116                 }
2117                 if (recvurg)
2118                         goto got_oob;
2119                 if (cnt < 0)
2120                         goto data_err;
2121                 transflag = 0;
2122                 return (0);
2123
2124         case TYPE_E:
2125                 reply(553, "TYPE E not implemented.");
2126                 transflag = 0;
2127                 return (-1);
2128
2129         case TYPE_A:
2130                 while ((c = getc(instr)) != EOF) {
2131                         if (recvurg)
2132                                 goto got_oob;
2133                         byte_count++;
2134                         if (c == '\n')
2135                                 bare_lfs++;
2136                         while (c == '\r') {
2137                                 if (ferror(outstr))
2138                                         goto data_err;
2139                                 if ((c = getc(instr)) != '\n') {
2140                                         (void) putc ('\r', outstr);
2141                                         if (c == '\0' || c == EOF)
2142                                                 goto contin2;
2143                                 }
2144                         }
2145                         (void) putc(c, outstr);
2146         contin2:        ;
2147                 }
2148                 if (recvurg)
2149                         goto got_oob;
2150                 fflush(outstr);
2151                 if (ferror(instr))
2152                         goto data_err;
2153                 if (ferror(outstr))
2154                         goto file_err;
2155                 transflag = 0;
2156                 if (bare_lfs) {
2157                         lreply(226,
2158                 "WARNING! %d bare linefeeds received in ASCII mode",
2159                             bare_lfs);
2160                 (void)printf("   File may not have transferred correctly.\r\n");
2161                 }
2162                 return (0);
2163         default:
2164                 reply(550, "Unimplemented TYPE %d in receive_data", type);
2165                 transflag = 0;
2166                 return (-1);
2167         }
2168
2169 data_err:
2170         transflag = 0;
2171         perror_reply(426, "Data Connection");
2172         return (-1);
2173
2174 file_err:
2175         transflag = 0;
2176         perror_reply(452, "Error writing file");
2177         return (-1);
2178
2179 got_oob:
2180         myoob();
2181         recvurg = 0;
2182         transflag = 0;
2183         return (-1);
2184 }
2185
2186 void
2187 statfilecmd(filename)
2188         char *filename;
2189 {
2190         FILE *fin;
2191         int atstart;
2192         int c;
2193         char line[LINE_MAX];
2194
2195         (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename);
2196         fin = ftpd_popen(line, "r");
2197         lreply(211, "status of %s:", filename);
2198         atstart = 1;
2199         while ((c = getc(fin)) != EOF) {
2200                 if (c == '\n') {
2201                         if (ferror(stdout)){
2202                                 perror_reply(421, "control connection");
2203                                 (void) ftpd_pclose(fin);
2204                                 dologout(1);
2205                                 /* NOTREACHED */
2206                         }
2207                         if (ferror(fin)) {
2208                                 perror_reply(551, filename);
2209                                 (void) ftpd_pclose(fin);
2210                                 return;
2211                         }
2212                         (void) putc('\r', stdout);
2213                 }
2214                 /*
2215                  * RFC 959 says neutral text should be prepended before
2216                  * a leading 3-digit number followed by whitespace, but
2217                  * many ftp clients can be confused by any leading digits,
2218                  * as a matter of fact.
2219                  */
2220                 if (atstart && isdigit(c))
2221                         (void) putc(' ', stdout);
2222                 (void) putc(c, stdout);
2223                 atstart = (c == '\n');
2224         }
2225         (void) ftpd_pclose(fin);
2226         reply(211, "End of Status");
2227 }
2228
2229 void
2230 statcmd()
2231 {
2232         union sockunion *su;
2233         u_char *a, *p;
2234         char hname[NI_MAXHOST];
2235         int ispassive;
2236
2237         if (hostinfo) {
2238                 lreply(211, "%s FTP server status:", hostname);
2239                 printf("     %s\r\n", version);
2240         } else
2241                 lreply(211, "FTP server status:");
2242         printf("     Connected to %s", remotehost);
2243         if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
2244                          hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) {
2245                 if (strcmp(hname, remotehost) != 0)
2246                         printf(" (%s)", hname);
2247         }
2248         printf("\r\n");
2249         if (logged_in) {
2250                 if (guest)
2251                         printf("     Logged in anonymously\r\n");
2252                 else
2253                         printf("     Logged in as %s\r\n", pw->pw_name);
2254         } else if (askpasswd)
2255                 printf("     Waiting for password\r\n");
2256         else
2257                 printf("     Waiting for user name\r\n");
2258         printf("     TYPE: %s", typenames[type]);
2259         if (type == TYPE_A || type == TYPE_E)
2260                 printf(", FORM: %s", formnames[form]);
2261         if (type == TYPE_L)
2262 #if NBBY == 8
2263                 printf(" %d", NBBY);
2264 #else
2265                 printf(" %d", bytesize);        /* need definition! */
2266 #endif
2267         printf("; STRUcture: %s; transfer MODE: %s\r\n",
2268             strunames[stru], modenames[mode]);
2269         if (data != -1)
2270                 printf("     Data connection open\r\n");
2271         else if (pdata != -1) {
2272                 ispassive = 1;
2273                 su = &pasv_addr;
2274                 goto printaddr;
2275         } else if (usedefault == 0) {
2276                 ispassive = 0;
2277                 su = &data_dest;
2278 printaddr:
2279 #define UC(b) (((int) b) & 0xff)
2280                 if (epsvall) {
2281                         printf("     EPSV only mode (EPSV ALL)\r\n");
2282                         goto epsvonly;
2283                 }
2284
2285                 /* PORT/PASV */
2286                 if (su->su_family == AF_INET) {
2287                         a = (u_char *) &su->su_sin.sin_addr;
2288                         p = (u_char *) &su->su_sin.sin_port;
2289                         printf("     %s (%d,%d,%d,%d,%d,%d)\r\n",
2290                                 ispassive ? "PASV" : "PORT",
2291                                 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2292                                 UC(p[0]), UC(p[1]));
2293                 }
2294
2295                 /* LPRT/LPSV */
2296             {
2297                 int alen, af, i;
2298
2299                 switch (su->su_family) {
2300                 case AF_INET:
2301                         a = (u_char *) &su->su_sin.sin_addr;
2302                         p = (u_char *) &su->su_sin.sin_port;
2303                         alen = sizeof(su->su_sin.sin_addr);
2304                         af = 4;
2305                         break;
2306                 case AF_INET6:
2307                         a = (u_char *) &su->su_sin6.sin6_addr;
2308                         p = (u_char *) &su->su_sin6.sin6_port;
2309                         alen = sizeof(su->su_sin6.sin6_addr);
2310                         af = 6;
2311                         break;
2312                 default:
2313                         af = 0;
2314                         break;
2315                 }
2316                 if (af) {
2317                         printf("     %s (%d,%d,", ispassive ? "LPSV" : "LPRT",
2318                                 af, alen);
2319                         for (i = 0; i < alen; i++)
2320                                 printf("%d,", UC(a[i]));
2321                         printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1]));
2322                 }
2323             }
2324
2325 epsvonly:;
2326                 /* EPRT/EPSV */
2327             {
2328                 int af;
2329
2330                 switch (su->su_family) {
2331                 case AF_INET:
2332                         af = 1;
2333                         break;
2334                 case AF_INET6:
2335                         af = 2;
2336                         break;
2337                 default:
2338                         af = 0;
2339                         break;
2340                 }
2341                 if (af) {
2342                         union sockunion tmp;
2343
2344                         tmp = *su;
2345                         if (tmp.su_family == AF_INET6)
2346                                 tmp.su_sin6.sin6_scope_id = 0;
2347                         if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len,
2348                                         hname, sizeof(hname) - 1, NULL, 0,
2349                                         NI_NUMERICHOST)) {
2350                                 printf("     %s |%d|%s|%d|\r\n",
2351                                         ispassive ? "EPSV" : "EPRT",
2352                                         af, hname, htons(tmp.su_port));
2353                         }
2354                 }
2355             }
2356 #undef UC
2357         } else
2358                 printf("     No data connection\r\n");
2359         reply(211, "End of status");
2360 }
2361
2362 void
2363 fatalerror(s)
2364         char *s;
2365 {
2366
2367         reply(451, "Error in server: %s\n", s);
2368         reply(221, "Closing connection due to server error.");
2369         dologout(0);
2370         /* NOTREACHED */
2371 }
2372
2373 void
2374 #if __STDC__
2375 reply(int n, const char *fmt, ...)
2376 #else
2377 reply(n, fmt, va_alist)
2378         int n;
2379         char *fmt;
2380         va_dcl
2381 #endif
2382 {
2383         va_list ap;
2384 #if __STDC__
2385         va_start(ap, fmt);
2386 #else
2387         va_start(ap);
2388 #endif
2389         (void)printf("%d ", n);
2390         (void)vprintf(fmt, ap);
2391         (void)printf("\r\n");
2392         (void)fflush(stdout);
2393         if (ftpdebug) {
2394                 syslog(LOG_DEBUG, "<--- %d ", n);
2395                 vsyslog(LOG_DEBUG, fmt, ap);
2396         }
2397 }
2398
2399 void
2400 #if __STDC__
2401 lreply(int n, const char *fmt, ...)
2402 #else
2403 lreply(n, fmt, va_alist)
2404         int n;
2405         char *fmt;
2406         va_dcl
2407 #endif
2408 {
2409         va_list ap;
2410 #if __STDC__
2411         va_start(ap, fmt);
2412 #else
2413         va_start(ap);
2414 #endif
2415         (void)printf("%d- ", n);
2416         (void)vprintf(fmt, ap);
2417         (void)printf("\r\n");
2418         (void)fflush(stdout);
2419         if (ftpdebug) {
2420                 syslog(LOG_DEBUG, "<--- %d- ", n);
2421                 vsyslog(LOG_DEBUG, fmt, ap);
2422         }
2423 }
2424
2425 static void
2426 ack(s)
2427         char *s;
2428 {
2429
2430         reply(250, "%s command successful.", s);
2431 }
2432
2433 void
2434 nack(s)
2435         char *s;
2436 {
2437
2438         reply(502, "%s command not implemented.", s);
2439 }
2440
2441 /* ARGSUSED */
2442 void
2443 yyerror(s)
2444         char *s;
2445 {
2446         char *cp;
2447
2448         if ((cp = strchr(cbuf,'\n')))
2449                 *cp = '\0';
2450         reply(500, "'%s': command not understood.", cbuf);
2451 }
2452
2453 void
2454 delete(name)
2455         char *name;
2456 {
2457         struct stat st;
2458
2459         LOGCMD("delete", name);
2460         if (lstat(name, &st) < 0) {
2461                 perror_reply(550, name);
2462                 return;
2463         }
2464         if ((st.st_mode&S_IFMT) == S_IFDIR) {
2465                 if (rmdir(name) < 0) {
2466                         perror_reply(550, name);
2467                         return;
2468                 }
2469                 goto done;
2470         }
2471         if (unlink(name) < 0) {
2472                 perror_reply(550, name);
2473                 return;
2474         }
2475 done:
2476         ack("DELE");
2477 }
2478
2479 void
2480 cwd(path)
2481         char *path;
2482 {
2483
2484         if (chdir(path) < 0)
2485                 perror_reply(550, path);
2486         else
2487                 ack("CWD");
2488 }
2489
2490 void
2491 makedir(name)
2492         char *name;
2493 {
2494         char *s;
2495
2496         LOGCMD("mkdir", name);
2497         if (guest && noguestmkd)
2498                 reply(550, "%s: permission denied", name);
2499         else if (mkdir(name, 0777) < 0)
2500                 perror_reply(550, name);
2501         else {
2502                 if ((s = doublequote(name)) == NULL)
2503                         fatalerror("Ran out of memory.");
2504                 reply(257, "\"%s\" directory created.", s);
2505                 free(s);
2506         }
2507 }
2508
2509 void
2510 removedir(name)
2511         char *name;
2512 {
2513
2514         LOGCMD("rmdir", name);
2515         if (rmdir(name) < 0)
2516                 perror_reply(550, name);
2517         else
2518                 ack("RMD");
2519 }
2520
2521 void
2522 pwd()
2523 {
2524         char *s, path[MAXPATHLEN + 1];
2525
2526         if (getwd(path) == (char *)NULL)
2527                 reply(550, "%s.", path);
2528         else {
2529                 if ((s = doublequote(path)) == NULL)
2530                         fatalerror("Ran out of memory.");
2531                 reply(257, "\"%s\" is current directory.", s);
2532                 free(s);
2533         }
2534 }
2535
2536 char *
2537 renamefrom(name)
2538         char *name;
2539 {
2540         struct stat st;
2541
2542         if (lstat(name, &st) < 0) {
2543                 perror_reply(550, name);
2544                 return ((char *)0);
2545         }
2546         reply(350, "File exists, ready for destination name");
2547         return (name);
2548 }
2549
2550 void
2551 renamecmd(from, to)
2552         char *from, *to;
2553 {
2554         struct stat st;
2555
2556         LOGCMD2("rename", from, to);
2557
2558         if (guest && (stat(to, &st) == 0)) {
2559                 reply(550, "%s: permission denied", to);
2560                 return;
2561         }
2562
2563         if (rename(from, to) < 0)
2564                 perror_reply(550, "rename");
2565         else
2566                 ack("RNTO");
2567 }
2568
2569 static void
2570 dolog(who)
2571         struct sockaddr *who;
2572 {
2573         int error;
2574
2575         realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len);
2576
2577 #ifdef SETPROCTITLE
2578 #ifdef VIRTUAL_HOSTING
2579         if (thishost != firsthost)
2580                 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)",
2581                          remotehost, hostname);
2582         else
2583 #endif
2584                 snprintf(proctitle, sizeof(proctitle), "%s: connected",
2585                          remotehost);
2586         setproctitle("%s", proctitle);
2587 #endif /* SETPROCTITLE */
2588
2589         if (logging) {
2590 #ifdef VIRTUAL_HOSTING
2591                 if (thishost != firsthost)
2592                         syslog(LOG_INFO, "connection from %s (to %s)",
2593                                remotehost, hostname);
2594                 else
2595 #endif
2596                 {
2597                         char    who_name[MAXHOSTNAMELEN];
2598
2599                         error = getnameinfo(who, who->sa_len,
2600                                             who_name, sizeof(who_name) - 1,
2601                                             NULL, 0, NI_NUMERICHOST);
2602                         syslog(LOG_INFO, "connection from %s (%s)", remotehost,
2603                                error == 0 ? who_name : "");
2604                 }
2605         }
2606 }
2607
2608 /*
2609  * Record logout in wtmp file
2610  * and exit with supplied status.
2611  */
2612 void
2613 dologout(status)
2614         int status;
2615 {
2616         /*
2617          * Prevent reception of SIGURG from resulting in a resumption
2618          * back to the main program loop.
2619          */
2620         transflag = 0;
2621
2622         if (logged_in && dowtmp) {
2623                 (void) seteuid((uid_t)0);
2624                 ftpd_logwtmp(ttyline, "", NULL);
2625         }
2626         /* beware of flushing buffers after a SIGPIPE */
2627         _exit(status);
2628 }
2629
2630 static void
2631 sigurg(signo)
2632         int signo;
2633 {
2634
2635         recvurg = 1;
2636 }
2637
2638 static void
2639 myoob()
2640 {
2641         char *cp;
2642
2643         /* only process if transfer occurring */
2644         if (!transflag)
2645                 return;
2646         cp = tmpline;
2647         if (getline(cp, 7, stdin) == NULL) {
2648                 reply(221, "You could at least say goodbye.");
2649                 dologout(0);
2650         }
2651         upper(cp);
2652         if (strcmp(cp, "ABOR\r\n") == 0) {
2653                 tmpline[0] = '\0';
2654                 reply(426, "Transfer aborted. Data connection closed.");
2655                 reply(226, "Abort successful");
2656         }
2657         if (strcmp(cp, "STAT\r\n") == 0) {
2658                 tmpline[0] = '\0';
2659                 if (file_size != (off_t) -1)
2660                         reply(213, "Status: %qd of %qd bytes transferred",
2661                             byte_count, file_size);
2662                 else
2663                         reply(213, "Status: %qd bytes transferred", byte_count);
2664         }
2665 }
2666
2667 /*
2668  * Note: a response of 425 is not mentioned as a possible response to
2669  *      the PASV command in RFC959. However, it has been blessed as
2670  *      a legitimate response by Jon Postel in a telephone conversation
2671  *      with Rick Adams on 25 Jan 89.
2672  */
2673 void
2674 passive()
2675 {
2676         int len, on;
2677         char *p, *a;
2678
2679         if (pdata >= 0)         /* close old port if one set */
2680                 close(pdata);
2681
2682         pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2683         if (pdata < 0) {
2684                 perror_reply(425, "Can't open passive connection");
2685                 return;
2686         }
2687         on = 1;
2688         if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2689                 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2690
2691         (void) seteuid((uid_t)0);
2692
2693 #ifdef IP_PORTRANGE
2694         if (ctrl_addr.su_family == AF_INET) {
2695             on = restricted_data_ports ? IP_PORTRANGE_HIGH
2696                                        : IP_PORTRANGE_DEFAULT;
2697
2698             if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2699                             &on, sizeof(on)) < 0)
2700                     goto pasv_error;
2701         }
2702 #endif
2703 #ifdef IPV6_PORTRANGE
2704         if (ctrl_addr.su_family == AF_INET6) {
2705             on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2706                                        : IPV6_PORTRANGE_DEFAULT;
2707
2708             if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2709                             &on, sizeof(on)) < 0)
2710                     goto pasv_error;
2711         }
2712 #endif
2713
2714         pasv_addr = ctrl_addr;
2715         pasv_addr.su_port = 0;
2716         if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0)
2717                 goto pasv_error;
2718
2719         (void) seteuid((uid_t)pw->pw_uid);
2720
2721         len = sizeof(pasv_addr);
2722         if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2723                 goto pasv_error;
2724         if (listen(pdata, 1) < 0)
2725                 goto pasv_error;
2726         if (pasv_addr.su_family == AF_INET)
2727                 a = (char *) &pasv_addr.su_sin.sin_addr;
2728         else if (pasv_addr.su_family == AF_INET6 &&
2729                  IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr))
2730                 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
2731         else
2732                 goto pasv_error;
2733
2734         p = (char *) &pasv_addr.su_port;
2735
2736 #define UC(b) (((int) b) & 0xff)
2737
2738         reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
2739                 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
2740         return;
2741
2742 pasv_error:
2743         (void) seteuid((uid_t)pw->pw_uid);
2744         (void) close(pdata);
2745         pdata = -1;
2746         perror_reply(425, "Can't open passive connection");
2747         return;
2748 }
2749
2750 /*
2751  * Long Passive defined in RFC 1639.
2752  *     228 Entering Long Passive Mode
2753  *         (af, hal, h1, h2, h3,..., pal, p1, p2...)
2754  */
2755
2756 void
2757 long_passive(cmd, pf)
2758         char *cmd;
2759         int pf;
2760 {
2761         int len, on;
2762         char *p, *a;
2763
2764         if (pdata >= 0)         /* close old port if one set */
2765                 close(pdata);
2766
2767         if (pf != PF_UNSPEC) {
2768                 if (ctrl_addr.su_family != pf) {
2769                         switch (ctrl_addr.su_family) {
2770                         case AF_INET:
2771                                 pf = 1;
2772                                 break;
2773                         case AF_INET6:
2774                                 pf = 2;
2775                                 break;
2776                         default:
2777                                 pf = 0;
2778                                 break;
2779                         }
2780                         /*
2781                          * XXX
2782                          * only EPRT/EPSV ready clients will understand this
2783                          */
2784                         if (strcmp(cmd, "EPSV") == 0 && pf) {
2785                                 reply(522, "Network protocol mismatch, "
2786                                         "use (%d)", pf);
2787                         } else
2788                                 reply(501, "Network protocol mismatch"); /*XXX*/
2789
2790                         return;
2791                 }
2792         }
2793
2794         pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2795         if (pdata < 0) {
2796                 perror_reply(425, "Can't open passive connection");
2797                 return;
2798         }
2799         on = 1;
2800         if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2801                 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2802
2803         (void) seteuid((uid_t)0);
2804
2805         pasv_addr = ctrl_addr;
2806         pasv_addr.su_port = 0;
2807         len = pasv_addr.su_len;
2808
2809 #ifdef IP_PORTRANGE
2810         if (ctrl_addr.su_family == AF_INET) {
2811             on = restricted_data_ports ? IP_PORTRANGE_HIGH
2812                                        : IP_PORTRANGE_DEFAULT;
2813
2814             if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2815                             &on, sizeof(on)) < 0)
2816                     goto pasv_error;
2817         }
2818 #endif
2819 #ifdef IPV6_PORTRANGE
2820         if (ctrl_addr.su_family == AF_INET6) {
2821             on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2822                                        : IPV6_PORTRANGE_DEFAULT;
2823
2824             if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2825                             &on, sizeof(on)) < 0)
2826                     goto pasv_error;
2827         }
2828 #endif
2829
2830         if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0)
2831                 goto pasv_error;
2832
2833         (void) seteuid((uid_t)pw->pw_uid);
2834
2835         if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2836                 goto pasv_error;
2837         if (listen(pdata, 1) < 0)
2838                 goto pasv_error;
2839
2840 #define UC(b) (((int) b) & 0xff)
2841
2842         if (strcmp(cmd, "LPSV") == 0) {
2843                 p = (char *)&pasv_addr.su_port;
2844                 switch (pasv_addr.su_family) {
2845                 case AF_INET:
2846                         a = (char *) &pasv_addr.su_sin.sin_addr;
2847                 v4_reply:
2848                         reply(228,
2849 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)",
2850                               4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2851                               2, UC(p[0]), UC(p[1]));
2852                         return;
2853                 case AF_INET6:
2854                         if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) {
2855                                 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
2856                                 goto v4_reply;
2857                         }
2858                         a = (char *) &pasv_addr.su_sin6.sin6_addr;
2859                         reply(228,
2860 "Entering Long Passive Mode "
2861 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)",
2862                               6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2863                               UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]),
2864                               UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]),
2865                               UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]),
2866                               2, UC(p[0]), UC(p[1]));
2867                         return;
2868                 }
2869         } else if (strcmp(cmd, "EPSV") == 0) {
2870                 switch (pasv_addr.su_family) {
2871                 case AF_INET:
2872                 case AF_INET6:
2873                         reply(229, "Entering Extended Passive Mode (|||%d|)",
2874                                 ntohs(pasv_addr.su_port));
2875                         return;
2876                 }
2877         } else {
2878                 /* more proper error code? */
2879         }
2880
2881 pasv_error:
2882         (void) seteuid((uid_t)pw->pw_uid);
2883         (void) close(pdata);
2884         pdata = -1;
2885         perror_reply(425, "Can't open passive connection");
2886         return;
2887 }
2888
2889 /*
2890  * Generate unique name for file with basename "local"
2891  * and open the file in order to avoid possible races.
2892  * Try "local" first, then "local.1", "local.2" etc, up to "local.99".
2893  * Return descriptor to the file, set "name" to its name.
2894  *
2895  * Generates failure reply on error.
2896  */
2897 static int
2898 guniquefd(local, name)
2899         char *local;
2900         char **name;
2901 {
2902         static char new[MAXPATHLEN];
2903         struct stat st;
2904         char *cp;
2905         int count;
2906         int fd;
2907
2908         cp = strrchr(local, '/');
2909         if (cp)
2910                 *cp = '\0';
2911         if (stat(cp ? local : ".", &st) < 0) {
2912                 perror_reply(553, cp ? local : ".");
2913                 return (-1);
2914         }
2915         if (cp) {
2916                 /*
2917                  * Let not overwrite dirname with counter suffix.
2918                  * -4 is for /nn\0
2919                  * In this extreme case dot won't be put in front of suffix.
2920                  */
2921                 if (strlen(local) > sizeof(new) - 4) {
2922                         reply(553, "Pathname too long");
2923                         return (-1);
2924                 }
2925                 *cp = '/';
2926         }
2927         /* -4 is for the .nn<null> we put on the end below */
2928         (void) snprintf(new, sizeof(new) - 4, "%s", local);
2929         cp = new + strlen(new);
2930         /*
2931          * Don't generate dotfile unless requested explicitly.
2932          * This covers the case when basename gets truncated off
2933          * by buffer size.
2934          */
2935         if (cp > new && cp[-1] != '/')
2936                 *cp++ = '.';
2937         for (count = 0; count < 100; count++) {
2938                 /* At count 0 try unmodified name */
2939                 if (count)
2940                         (void)sprintf(cp, "%d", count);
2941                 if ((fd = open(count ? new : local,
2942                     O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) {
2943                         *name = count ? new : local;
2944                         return (fd);
2945                 }
2946                 if (errno != EEXIST) {
2947                         perror_reply(553, count ? new : local);
2948                         return (-1);
2949                 }
2950         }
2951         reply(452, "Unique file name cannot be created.");
2952         return (-1);
2953 }
2954
2955 /*
2956  * Format and send reply containing system error number.
2957  */
2958 void
2959 perror_reply(code, string)
2960         int code;
2961         char *string;
2962 {
2963
2964         reply(code, "%s: %s.", string, strerror(errno));
2965 }
2966
2967 static char *onefile[] = {
2968         "",
2969         0
2970 };
2971
2972 void
2973 send_file_list(whichf)
2974         char *whichf;
2975 {
2976         struct stat st;
2977         DIR *dirp = NULL;
2978         struct dirent *dir;
2979         FILE *dout = NULL;
2980         char **dirlist, *dirname;
2981         int simple = 0;
2982         int freeglob = 0;
2983         glob_t gl;
2984
2985         if (strpbrk(whichf, "~{[*?") != NULL) {
2986                 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE;
2987
2988                 memset(&gl, 0, sizeof(gl));
2989                 gl.gl_matchc = MAXGLOBARGS;
2990                 flags |= GLOB_LIMIT;
2991                 freeglob = 1;
2992                 if (glob(whichf, flags, 0, &gl)) {
2993                         reply(550, "not found");
2994                         goto out;
2995                 } else if (gl.gl_pathc == 0) {
2996                         errno = ENOENT;
2997                         perror_reply(550, whichf);
2998                         goto out;
2999                 }
3000                 dirlist = gl.gl_pathv;
3001         } else {
3002                 onefile[0] = whichf;
3003                 dirlist = onefile;
3004                 simple = 1;
3005         }
3006
3007         while ((dirname = *dirlist++)) {
3008                 if (stat(dirname, &st) < 0) {
3009                         /*
3010                          * If user typed "ls -l", etc, and the client
3011                          * used NLST, do what the user meant.
3012                          */
3013                         if (dirname[0] == '-' && *dirlist == NULL &&
3014                             transflag == 0) {
3015                                 retrieve(_PATH_LS " %s", dirname);
3016                                 goto out;
3017                         }
3018                         perror_reply(550, whichf);
3019                         if (dout != NULL) {
3020                                 (void) fclose(dout);
3021                                 transflag = 0;
3022                                 data = -1;
3023                                 pdata = -1;
3024                         }
3025                         goto out;
3026                 }
3027
3028                 if (S_ISREG(st.st_mode)) {
3029                         if (dout == NULL) {
3030                                 dout = dataconn("file list", (off_t)-1, "w");
3031                                 if (dout == NULL)
3032                                         goto out;
3033                                 transflag++;
3034                         }
3035                         fprintf(dout, "%s%s\n", dirname,
3036                                 type == TYPE_A ? "\r" : "");
3037                         byte_count += strlen(dirname) + 1;
3038                         continue;
3039                 } else if (!S_ISDIR(st.st_mode))
3040                         continue;
3041
3042                 if ((dirp = opendir(dirname)) == NULL)
3043                         continue;
3044
3045                 while ((dir = readdir(dirp)) != NULL) {
3046                         char nbuf[MAXPATHLEN];
3047
3048                         if (recvurg) {
3049                                 myoob();
3050                                 recvurg = 0;
3051                                 transflag = 0;
3052                                 goto out;
3053                         }
3054
3055                         if (strcmp(dir->d_name, ".") == 0)
3056                                 continue;
3057                         if (strcmp(dir->d_name, "..") == 0)
3058                                 continue;
3059
3060                         snprintf(nbuf, sizeof(nbuf),
3061                                 "%s/%s", dirname, dir->d_name);
3062
3063                         /*
3064                          * We have to do a stat to insure it's
3065                          * not a directory or special file.
3066                          */
3067                         if (simple || (stat(nbuf, &st) == 0 &&
3068                             S_ISREG(st.st_mode))) {
3069                                 if (dout == NULL) {
3070                                         dout = dataconn("file list", (off_t)-1,
3071                                                 "w");
3072                                         if (dout == NULL)
3073                                                 goto out;
3074                                         transflag++;
3075                                 }
3076                                 if (nbuf[0] == '.' && nbuf[1] == '/')
3077                                         fprintf(dout, "%s%s\n", &nbuf[2],
3078                                                 type == TYPE_A ? "\r" : "");
3079                                 else
3080                                         fprintf(dout, "%s%s\n", nbuf,
3081                                                 type == TYPE_A ? "\r" : "");
3082                                 byte_count += strlen(nbuf) + 1;
3083                         }
3084                 }
3085                 (void) closedir(dirp);
3086         }
3087
3088         if (dout == NULL)
3089                 reply(550, "No files found.");
3090         else if (ferror(dout) != 0)
3091                 perror_reply(550, "Data connection");
3092         else
3093                 reply(226, "Transfer complete.");
3094
3095         transflag = 0;
3096         if (dout != NULL)
3097                 (void) fclose(dout);
3098         data = -1;
3099         pdata = -1;
3100 out:
3101         if (freeglob) {
3102                 freeglob = 0;
3103                 globfree(&gl);
3104         }
3105 }
3106
3107 void
3108 reapchild(signo)
3109         int signo;
3110 {
3111         while (wait3(NULL, WNOHANG, NULL) > 0);
3112 }
3113
3114 #ifdef OLD_SETPROCTITLE
3115 /*
3116  * Clobber argv so ps will show what we're doing.  (Stolen from sendmail.)
3117  * Warning, since this is usually started from inetd.conf, it often doesn't
3118  * have much of an environment or arglist to overwrite.
3119  */
3120 void
3121 #if __STDC__
3122 setproctitle(const char *fmt, ...)
3123 #else
3124 setproctitle(fmt, va_alist)
3125         char *fmt;
3126         va_dcl
3127 #endif
3128 {
3129         int i;
3130         va_list ap;
3131         char *p, *bp, ch;
3132         char buf[LINE_MAX];
3133
3134 #if __STDC__
3135         va_start(ap, fmt);
3136 #else
3137         va_start(ap);
3138 #endif
3139         (void)vsnprintf(buf, sizeof(buf), fmt, ap);
3140
3141         /* make ps print our process name */
3142         p = Argv[0];
3143         *p++ = '-';
3144
3145         i = strlen(buf);
3146         if (i > LastArgv - p - 2) {
3147                 i = LastArgv - p - 2;
3148                 buf[i] = '\0';
3149         }
3150         bp = buf;
3151         while (ch = *bp++)
3152                 if (ch != '\n' && ch != '\r')
3153                         *p++ = ch;
3154         while (p < LastArgv)
3155                 *p++ = ' ';
3156 }
3157 #endif /* OLD_SETPROCTITLE */
3158
3159 static void
3160 logxfer(name, size, start)
3161         char *name;
3162         off_t size;
3163         time_t start;
3164 {
3165         char buf[1024];
3166         char path[MAXPATHLEN + 1];
3167         time_t now;
3168
3169         if (statfd >= 0 && getwd(path) != NULL) {
3170                 time(&now);
3171                 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n",
3172                         ctime(&now)+4, ident, remotehost,
3173                         path, name, (long long)size,
3174                         (long)(now - start + (now == start)));
3175                 write(statfd, buf, strlen(buf));
3176         }
3177 }
3178
3179 static char *
3180 doublequote(s)
3181         char *s;
3182 {
3183         int n;
3184         char *p, *s2;
3185
3186         for (p = s, n = 0; *p; p++)
3187                 if (*p == '"')
3188                         n++;
3189
3190         if ((s2 = malloc(p - s + n + 1)) == NULL)
3191                 return (NULL);
3192
3193         for (p = s2; *s; s++, p++) {
3194                 if ((*p = *s) == '"')
3195                         *(++p) = '"';
3196         }
3197         *p = '\0';
3198
3199         return (s2);
3200 }