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 1.6 2005/08/08 16:17:04 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:AdDEhlmMoOp: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 'l':
 343                         logging++;      /* > 1 == extra logging */
 344                         break;
 345
 346                 case 'm':
 347                         noguestmod = 0;
 348                         break;
 349
 350                 case 'M':
 351                         noguestmkd = 1;
 352                         break;
 353
 354                 case 'o':
 355                         noretr = 1;
 356                         break;
 357
 358                 case 'O':
 359                         noguestretr = 1;
 360                         break;
 361
 362                 case 'p':
 363                         pid_file = optarg;
 364                         break;
 365
 366                 case 'P':
 367                         bindport = optarg;
 368                         break;
 369
 370                 case 'r':
 371                         readonly = 1;
 372                         break;
 373
 374                 case 'R':
 375                         paranoid = 0;
 376                         break;
 377
 378                 case 'S':
 379                         stats++;
 380                         break;
 381
 382                 case 't':
 383                         timeout = atoi(optarg);
 384                         if (maxtimeout < timeout)
 385                                 maxtimeout = timeout;
 386                         break;
 387
 388                 case 'T':
 389                         maxtimeout = atoi(optarg);
 390                         if (timeout > maxtimeout)
 391                                 timeout = maxtimeout;
 392                         break;
 393
 394                 case 'u':
 395                     {
 396                         long val = 0;
 397
 398                         val = strtol(optarg, &optarg, 8);
 399                         if (*optarg != '\0' || val < 0)
 400                                 warnx("bad value for -u");
 401                         else
 402                                 defumask = val;
 403                         break;
 404                     }
 405                 case 'U':
 406                         restricted_data_ports = 0;
 407                         break;
 408
 409                 case 'v':
 410                         ftpdebug++;
 411                         break;
 412
 413                 case 'W':
 414                         dowtmp = 0;
 415                         break;
 416
 417                 default:
 418                         warnx("unknown flag -%c ignored", optopt);
 419                         break;
 420                 }
 421         }
 422
 423 #ifdef VIRTUAL_HOSTING
 424         inithosts();
 425 #endif
 426         (void) freopen(_PATH_DEVNULL, "w", stderr);
 427
 428         /*
 429          * LOG_NDELAY sets up the logging connection immediately,
 430          * necessary for anonymous ftp's that chroot and can't do it later.
 431          */
 432         openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
 433
 434         if (daemon_mode) {
 435                 int ctl_sock, fd;
 436                 struct addrinfo hints, *res;
 437
 438                 /*
 439                  * Detach from parent.
 440                  */
 441                 if (daemon(1, 1) < 0) {
 442                         syslog(LOG_ERR, "failed to become a daemon");
 443                         exit(1);
 444                 }
 445                 sa.sa_handler = reapchild;
 446                 (void)sigaction(SIGCHLD, &sa, NULL);
 447                 /* init bind_sa */
 448                 memset(&hints, 0, sizeof(hints));
 449
 450                 hints.ai_family = family == AF_UNSPEC ? AF_INET : family;
 451                 hints.ai_socktype = SOCK_STREAM;
 452                 hints.ai_protocol = 0;
 453                 hints.ai_flags = AI_PASSIVE;
 454                 error = getaddrinfo(bindname, bindport, &hints, &res);
 455                 if (error) {
 456                         if (family == AF_UNSPEC) {
 457                                 hints.ai_family = AF_UNSPEC;
 458                                 error = getaddrinfo(bindname, bindport, &hints,
 459                                                     &res);
 460                         }
 461                 }
 462                 if (error) {
 463                         syslog(LOG_ERR, "%s", gai_strerror(error));
 464                         if (error == EAI_SYSTEM)
 465                                 syslog(LOG_ERR, "%s", strerror(errno));
 466                         exit(1);
 467                 }
 468                 if (res->ai_addr == NULL) {
 469                         syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
 470                         exit(1);
 471                 } else
 472                         family = res->ai_addr->sa_family;
 473                 /*
 474                  * Open a socket, bind it to the FTP port, and start
 475                  * listening.
 476                  */
 477                 ctl_sock = socket(family, SOCK_STREAM, 0);
 478                 if (ctl_sock < 0) {
 479                         syslog(LOG_ERR, "control socket: %m");
 480                         exit(1);
 481                 }
 482                 if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR,
 483                     &on, sizeof(on)) < 0)
 484                         syslog(LOG_WARNING,
 485                                "control setsockopt (SO_REUSEADDR): %m");
 486                 if (family == AF_INET6 && enable_v4 == 0) {
 487                         if (setsockopt(ctl_sock, IPPROTO_IPV6, IPV6_V6ONLY,
 488                                        &on, sizeof (on)) < 0)
 489                                 syslog(LOG_WARNING,
 490                                        "control setsockopt (IPV6_V6ONLY): %m");
 491                 }
 492                 memcpy(&server_addr, res->ai_addr, res->ai_addr->sa_len);
 493                 if (bind(ctl_sock, (struct sockaddr *)&server_addr,
 494                          server_addr.su_len) < 0) {
 495                         syslog(LOG_ERR, "control bind: %m");
 496                         exit(1);
 497                 }
 498                 if (listen(ctl_sock, 32) < 0) {
 499                         syslog(LOG_ERR, "control listen: %m");
 500                         exit(1);
 501                 }
 502                 /*
 503                  * Atomically write process ID
 504                  */
 505                 if (pid_file)
 506                 {
 507                         int fd;
 508                         char buf[20];
 509
 510                         fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC
 511                                 | O_NONBLOCK | O_EXLOCK, 0644);
 512                         if (fd < 0) {
 513                                 if (errno == EAGAIN)
 514                                         errx(1, "%s: file locked", pid_file);
 515                                 else
 516                                         err(1, "%s", pid_file);
 517                         }
 518                         snprintf(buf, sizeof(buf),
 519                                 "%lu\n", (unsigned long) getpid());
 520                         if (write(fd, buf, strlen(buf)) < 0)
 521                                 err(1, "%s: write", pid_file);
 522                         /* Leave the pid file open and locked */
 523                 }
 524                 /*
 525                  * Loop forever accepting connection requests and forking off
 526                  * children to handle them.
 527                  */
 528                 while (1) {
 529                         addrlen = server_addr.su_len;
 530                         fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen);
 531
 532                         if (fd >= 0) {
 533                                 if (fork() == 0) {
 534                                         /* child */
 535                                         (void) dup2(fd, 0);
 536                                         (void) dup2(fd, 1);
 537                                         close(ctl_sock);
 538                                         break;
 539                                 }
 540                                 close(fd);
 541                         }
 542                 }
 543         } else {
 544                 addrlen = sizeof(his_addr);
 545                 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
 546                         syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
 547                         exit(1);
 548                 }
 549         }
 550
 551         sa.sa_handler = SIG_DFL;
 552         (void)sigaction(SIGCHLD, &sa, NULL);
 553
 554         sa.sa_handler = sigurg;
 555         sa.sa_flags = 0;                /* don't restart syscalls for SIGURG */
 556         (void)sigaction(SIGURG, &sa, NULL);
 557
 558         sigfillset(&sa.sa_mask);        /* block all signals in handler */
 559         sa.sa_flags = SA_RESTART;
 560         sa.sa_handler = sigquit;
 561         (void)sigaction(SIGHUP, &sa, NULL);
 562         (void)sigaction(SIGINT, &sa, NULL);
 563         (void)sigaction(SIGQUIT, &sa, NULL);
 564         (void)sigaction(SIGTERM, &sa, NULL);
 565
 566         sa.sa_handler = lostconn;
 567         (void)sigaction(SIGPIPE, &sa, NULL);
 568
 569         addrlen = sizeof(ctrl_addr);
 570         if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
 571                 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
 572                 exit(1);
 573         }
 574         dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */
 575 #ifdef VIRTUAL_HOSTING
 576         /* select our identity from virtual host table */
 577         selecthost(&ctrl_addr);
 578 #endif
 579 #ifdef IP_TOS
 580         if (ctrl_addr.su_family == AF_INET)
 581       {
 582         tos = IPTOS_LOWDELAY;
 583         if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
 584                 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m");
 585       }
 586 #endif
 587         /*
 588          * Disable Nagle on the control channel so that we don't have to wait
 589          * for peer's ACK before issuing our next reply.
 590          */
 591         if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
 592                 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m");
 593
 594         data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1);
 595
 596         /* set this here so klogin can use it... */
 597         (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid());
 598
 599         /* Try to handle urgent data inline */
 600 #ifdef SO_OOBINLINE
 601         if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0)
 602                 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m");
 603 #endif
 604
 605 #ifdef  F_SETOWN
 606         if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
 607                 syslog(LOG_ERR, "fcntl F_SETOWN: %m");
 608 #endif
 609         dolog((struct sockaddr *)&his_addr);
 610         /*
 611          * Set up default state
 612          */
 613         data = -1;
 614         type = TYPE_A;
 615         form = FORM_N;
 616         stru = STRU_F;
 617         mode = MODE_S;
 618         tmpline[0] = '\0';
 619
 620         /* If logins are disabled, print out the message. */
 621         if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
 622                 while (fgets(line, sizeof(line), fd) != NULL) {
 623                         if ((cp = strchr(line, '\n')) != NULL)
 624                                 *cp = '\0';
 625                         lreply(530, "%s", line);
 626                 }
 627                 (void) fflush(stdout);
 628                 (void) fclose(fd);
 629                 reply(530, "System not available.");
 630                 exit(0);
 631         }
 632 #ifdef VIRTUAL_HOSTING
 633         if ((fd = fopen(thishost->welcome, "r")) != NULL) {
 634 #else
 635         if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) {
 636 #endif
 637                 while (fgets(line, sizeof(line), fd) != NULL) {
 638                         if ((cp = strchr(line, '\n')) != NULL)
 639                                 *cp = '\0';
 640                         lreply(220, "%s", line);
 641                 }
 642                 (void) fflush(stdout);
 643                 (void) fclose(fd);
 644                 /* reply(220,) must follow */
 645         }
 646 #ifndef VIRTUAL_HOSTING
 647         if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
 648                 fatalerror("Ran out of memory.");
 649         (void) gethostname(hostname, MAXHOSTNAMELEN - 1);
 650         hostname[MAXHOSTNAMELEN - 1] = '\0';
 651 #endif
 652         if (hostinfo)
 653                 reply(220, "%s FTP server (%s) ready.", hostname, version);
 654         else
 655                 reply(220, "FTP server ready.");
 656         for (;;)
 657                 (void) yyparse();
 658         /* NOTREACHED */
 659 }
 660
 661 static void
 662 lostconn(signo)
 663         int signo;
 664 {
 665
 666         if (ftpdebug)
 667                 syslog(LOG_DEBUG, "lost connection");
 668         dologout(1);
 669 }
 670
 671 static void
 672 sigquit(signo)
 673         int signo;
 674 {
 675
 676         syslog(LOG_ERR, "got signal %d", signo);
 677         dologout(1);
 678 }
 679
 680 #ifdef VIRTUAL_HOSTING
 681 /*
 682  * read in virtual host tables (if they exist)
 683  */
 684
 685 static void
 686 inithosts()
 687 {
 688         int insert;
 689         size_t len;
 690         FILE *fp;
 691         char *cp, *mp, *line;
 692         char *hostname;
 693         char *vhost, *anonuser, *statfile, *welcome, *loginmsg;
 694         struct ftphost *hrp, *lhrp;
 695         struct addrinfo hints, *res, *ai;
 696
 697         /*
 698          * Fill in the default host information
 699          */
 700         if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
 701                 fatalerror("Ran out of memory.");
 702         if (gethostname(hostname, MAXHOSTNAMELEN) < 0)
 703                 hostname[0] = '\0';
 704         hostname[MAXHOSTNAMELEN - 1] = '\0';
 705         if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
 706                 fatalerror("Ran out of memory.");
 707         hrp->hostname = hostname;
 708         hrp->hostinfo = NULL;
 709
 710         memset(&hints, 0, sizeof(hints));
 711         hints.ai_flags = AI_CANONNAME;
 712         hints.ai_family = AF_UNSPEC;
 713         if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0)
 714                 hrp->hostinfo = res;
 715         hrp->statfile = _PATH_FTPDSTATFILE;
 716         hrp->welcome  = _PATH_FTPWELCOME;
 717         hrp->loginmsg = _PATH_FTPLOGINMESG;
 718         hrp->anonuser = "ftp";
 719         hrp->next = NULL;
 720         thishost = firsthost = lhrp = hrp;
 721         if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) {
 722                 int addrsize, gothost;
 723                 void *addr;
 724                 struct hostent *hp;
 725
 726                 while ((line = fgetln(fp, &len)) != NULL) {
 727                         int     i, hp_error;
 728
 729                         /* skip comments */
 730                         if (line[0] == '#')
 731                                 continue;
 732                         if (line[len - 1] == '\n') {
 733                                 line[len - 1] = '\0';
 734                                 mp = NULL;
 735                         } else {
 736                                 if ((mp = malloc(len + 1)) == NULL)
 737                                         fatalerror("Ran out of memory.");
 738                                 memcpy(mp, line, len);
 739                                 mp[len] = '\0';
 740                                 line = mp;
 741                         }
 742                         cp = strtok(line, " \t");
 743                         /* skip empty lines */
 744                         if (cp == NULL)
 745                                 goto nextline;
 746                         vhost = cp;
 747
 748                         /* set defaults */
 749                         anonuser = "ftp";
 750                         statfile = _PATH_FTPDSTATFILE;
 751                         welcome  = _PATH_FTPWELCOME;
 752                         loginmsg = _PATH_FTPLOGINMESG;
 753
 754                         /*
 755                          * Preparse the line so we can use its info
 756                          * for all the addresses associated with
 757                          * the virtual host name.
 758                          * Field 0, the virtual host name, is special:
 759                          * it's already parsed off and will be strdup'ed
 760                          * later, after we know its canonical form.
 761                          */
 762                         for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++)
 763                                 if (*cp != '-' && (cp = strdup(cp)))
 764                                         switch (i) {
 765                                         case 1: /* anon user permissions */
 766                                                 anonuser = cp;
 767                                                 break;
 768                                         case 2: /* statistics file */
 769                                                 statfile = cp;
 770                                                 break;
 771                                         case 3: /* welcome message */
 772                                                 welcome  = cp;
 773                                                 break;
 774                                         case 4: /* login message */
 775                                                 loginmsg = cp;
 776                                                 break;
 777                                         default: /* programming error */
 778                                                 abort();
 779                                                 /* NOTREACHED */
 780                                         }
 781
 782                         hints.ai_flags = 0;
 783                         hints.ai_family = AF_UNSPEC;
 784                         hints.ai_flags = AI_PASSIVE;
 785                         if (getaddrinfo(vhost, NULL, &hints, &res) != 0)
 786                                 goto nextline;
 787                         for (ai = res; ai != NULL && ai->ai_addr != NULL;
 788                              ai = ai->ai_next) {
 789
 790                         gothost = 0;
 791                         for (hrp = firsthost; hrp != NULL; hrp = hrp->next) {
 792                                 struct addrinfo *hi;
 793
 794                                 for (hi = hrp->hostinfo; hi != NULL;
 795                                      hi = hi->ai_next)
 796                                         if (hi->ai_addrlen == ai->ai_addrlen &&
 797                                             memcmp(hi->ai_addr,
 798                                                    ai->ai_addr,
 799                                                    ai->ai_addr->sa_len) == 0) {
 800                                                 gothost++;
 801                                                 break;
 802                                         }
 803                                 if (gothost)
 804                                         break;
 805                         }
 806                         if (hrp == NULL) {
 807                                 if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
 808                                         goto nextline;
 809                                 hrp->hostname = NULL;
 810                                 insert = 1;
 811                         } else {
 812                                 if (hrp->hostinfo && hrp->hostinfo != res)
 813                                         freeaddrinfo(hrp->hostinfo);
 814                                 insert = 0; /* host already in the chain */
 815                         }
 816                         hrp->hostinfo = res;
 817
 818                         /*
 819                          * determine hostname to use.
 820                          * force defined name if there is a valid alias
 821                          * otherwise fallback to primary hostname
 822                          */
 823                         /* XXX: getaddrinfo() can't do alias check */
 824                         switch(hrp->hostinfo->ai_family) {
 825                         case AF_INET:
 826                                 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr;
 827                                 addrsize = sizeof(struct in_addr);
 828                                 break;
 829                         case AF_INET6:
 830                                 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr;
 831                                 addrsize = sizeof(struct in6_addr);
 832                                 break;
 833                         default:
 834                                 /* should not reach here */
 835                                 freeaddrinfo(hrp->hostinfo);
 836                                 if (insert)
 837                                         free(hrp); /*not in chain, can free*/
 838                                 else
 839                                         hrp->hostinfo = NULL; /*mark as blank*/
 840                                 goto nextline;
 841                                 /* NOTREACHED */
 842                         }
 843                         if ((hp = getipnodebyaddr(addr, addrsize,
 844                                                   hrp->hostinfo->ai_family,
 845                                                   &hp_error)) != NULL) {
 846                                 if (strcmp(vhost, hp->h_name) != 0) {
 847                                         if (hp->h_aliases == NULL)
 848                                                 vhost = hp->h_name;
 849                                         else {
 850                                                 i = 0;
 851                                                 while (hp->h_aliases[i] &&
 852                                                        strcmp(vhost, hp->h_aliases[i]) != 0)
 853                                                         ++i;
 854                                                 if (hp->h_aliases[i] == NULL)
 855                                                         vhost = hp->h_name;
 856                                         }
 857                                 }
 858                         }
 859                         if (hrp->hostname &&
 860                             strcmp(hrp->hostname, vhost) != 0) {
 861                                 free(hrp->hostname);
 862                                 hrp->hostname = NULL;
 863                         }
 864                         if (hrp->hostname == NULL &&
 865                             (hrp->hostname = strdup(vhost)) == NULL) {
 866                                 freeaddrinfo(hrp->hostinfo);
 867                                 hrp->hostinfo = NULL; /* mark as blank */
 868                                 if (hp)
 869                                         freehostent(hp);
 870                                 goto nextline;
 871                         }
 872                         hrp->anonuser = anonuser;
 873                         hrp->statfile = statfile;
 874                         hrp->welcome  = welcome;
 875                         hrp->loginmsg = loginmsg;
 876                         if (insert) {
 877                                 hrp->next  = NULL;
 878                                 lhrp->next = hrp;
 879                                 lhrp = hrp;
 880                         }
 881                         if (hp)
 882                                 freehostent(hp);
 883                       }
 884 nextline:
 885                         if (mp)
 886                                 free(mp);
 887                 }
 888                 (void) fclose(fp);
 889         }
 890 }
 891
 892 static void
 893 selecthost(su)
 894         union sockunion *su;
 895 {
 896         struct ftphost  *hrp;
 897         u_int16_t port;
 898 #ifdef INET6
 899         struct in6_addr *mapped_in6 = NULL;
 900 #endif
 901         struct addrinfo *hi;
 902
 903 #ifdef INET6
 904         /*
 905          * XXX IPv4 mapped IPv6 addr consideraton,
 906          * specified in rfc2373.
 907          */
 908         if (su->su_family == AF_INET6 &&
 909             IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr))
 910                 mapped_in6 = &su->su_sin6.sin6_addr;
 911 #endif
 912
 913         hrp = thishost = firsthost;     /* default */
 914         port = su->su_port;
 915         su->su_port = 0;
 916         while (hrp != NULL) {
 917             for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) {
 918                 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) {
 919                         thishost = hrp;
 920                         break;
 921                 }
 922 #ifdef INET6
 923                 /* XXX IPv4 mapped IPv6 addr consideraton */
 924                 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL &&
 925                     (memcmp(&mapped_in6->s6_addr[12],
 926                             &((struct sockaddr_in *)hi->ai_addr)->sin_addr,
 927                             sizeof(struct in_addr)) == 0)) {
 928                         thishost = hrp;
 929                         break;
 930                 }
 931 #endif
 932             }
 933             hrp = hrp->next;
 934         }
 935         su->su_port = port;
 936         /* setup static variables as appropriate */
 937         hostname = thishost->hostname;
 938         ftpuser = thishost->anonuser;
 939 }
 940 #endif
 941
 942 /*
 943  * Helper function for sgetpwnam().
 944  */
 945 static char *
 946 sgetsave(s)
 947         char *s;
 948 {
 949         char *new = malloc((unsigned) strlen(s) + 1);
 950
 951         if (new == NULL) {
 952                 perror_reply(421, "Local resource failure: malloc");
 953                 dologout(1);
 954                 /* NOTREACHED */
 955         }
 956         (void) strcpy(new, s);
 957         return (new);
 958 }
 959
 960 /*
 961  * Save the result of a getpwnam.  Used for USER command, since
 962  * the data returned must not be clobbered by any other command
 963  * (e.g., globbing).
 964  */
 965 static struct passwd *
 966 sgetpwnam(name)
 967         char *name;
 968 {
 969         static struct passwd save;
 970         struct passwd *p;
 971
 972         if ((p = getpwnam(name)) == NULL)
 973                 return (p);
 974         if (save.pw_name) {
 975                 free(save.pw_name);
 976                 free(save.pw_passwd);
 977                 free(save.pw_gecos);
 978                 free(save.pw_dir);
 979                 free(save.pw_shell);
 980         }
 981         save = *p;
 982         save.pw_name = sgetsave(p->pw_name);
 983         save.pw_passwd = sgetsave(p->pw_passwd);
 984         save.pw_gecos = sgetsave(p->pw_gecos);
 985         save.pw_dir = sgetsave(p->pw_dir);
 986         save.pw_shell = sgetsave(p->pw_shell);
 987         return (&save);
 988 }
 989
 990 static int login_attempts;      /* number of failed login attempts */
 991 static int askpasswd;           /* had user command, ask for passwd */
 992 static char curname[MAXLOGNAME];        /* current USER name */
 993
 994 /*
 995  * USER command.
 996  * Sets global passwd pointer pw if named account exists and is acceptable;
 997  * sets askpasswd if a PASS command is expected.  If logged in previously,
 998  * need to reset state.  If name is "ftp" or "anonymous", the name is not in
 999  * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
1000  * If account doesn't exist, ask for passwd anyway.  Otherwise, check user
1001  * requesting login privileges.  Disallow anyone who does not have a standard
1002  * shell as returned by getusershell().  Disallow anyone mentioned in the file
1003  * _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
1004  */
1005 void
1006 user(name)
1007         char *name;
1008 {
1009         char *cp, *shell;
1010
1011         if (logged_in) {
1012                 if (guest) {
1013                         reply(530, "Can't change user from guest login.");
1014                         return;
1015                 } else if (dochroot) {
1016                         reply(530, "Can't change user from chroot user.");
1017                         return;
1018                 }
1019                 end_login();
1020         }
1021
1022         guest = 0;
1023         if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
1024                 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) ||
1025                     checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL))
1026                         reply(530, "User %s access denied.", name);
1027 #ifdef VIRTUAL_HOSTING
1028                 else if ((pw = sgetpwnam(thishost->anonuser)) != NULL) {
1029 #else
1030                 else if ((pw = sgetpwnam("ftp")) != NULL) {
1031 #endif
1032                         guest = 1;
1033                         askpasswd = 1;
1034                         reply(331,
1035                         "Guest login ok, send your email address as password.");
1036                 } else
1037                         reply(530, "User %s unknown.", name);
1038                 if (!askpasswd && logging)
1039                         syslog(LOG_NOTICE,
1040                             "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
1041                 return;
1042         }
1043         if (anon_only != 0) {
1044                 reply(530, "Sorry, only anonymous ftp allowed.");
1045                 return;
1046         }
1047
1048         if ((pw = sgetpwnam(name))) {
1049                 if ((shell = pw->pw_shell) == NULL || *shell == 0)
1050                         shell = _PATH_BSHELL;
1051                 while ((cp = getusershell()) != NULL)
1052                         if (strcmp(cp, shell) == 0)
1053                                 break;
1054                 endusershell();
1055
1056                 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) {
1057                         reply(530, "User %s access denied.", name);
1058                         if (logging)
1059                                 syslog(LOG_NOTICE,
1060                                     "FTP LOGIN REFUSED FROM %s, %s",
1061                                     remotehost, name);
1062                         pw = (struct passwd *) NULL;
1063                         return;
1064                 }
1065         }
1066         if (logging)
1067                 strncpy(curname, name, sizeof(curname)-1);
1068 #ifdef SKEY
1069         pwok = skeyaccess(name, NULL, remotehost, remotehost);
1070         reply(331, "%s", skey_challenge(name, pw, pwok));
1071 #else
1072         reply(331, "Password required for %s.", name);
1073 #endif
1074         askpasswd = 1;
1075         /*
1076          * Delay before reading passwd after first failed
1077          * attempt to slow down passwd-guessing programs.
1078          */
1079         if (login_attempts)
1080                 sleep((unsigned) login_attempts);
1081 }
1082
1083 /*
1084  * Check if a user is in the file "fname",
1085  * return a pointer to a malloc'd string with the rest
1086  * of the matching line in "residue" if not NULL.
1087  */
1088 static int
1089 checkuser(fname, name, pwset, residue)
1090         char *fname;
1091         char *name;
1092         int pwset;
1093         char **residue;
1094 {
1095         FILE *fd;
1096         int found = 0;
1097         size_t len;
1098         char *line, *mp, *p;
1099
1100         if ((fd = fopen(fname, "r")) != NULL) {
1101                 while (!found && (line = fgetln(fd, &len)) != NULL) {
1102                         /* skip comments */
1103                         if (line[0] == '#')
1104                                 continue;
1105                         if (line[len - 1] == '\n') {
1106                                 line[len - 1] = '\0';
1107                                 mp = NULL;
1108                         } else {
1109                                 if ((mp = malloc(len + 1)) == NULL)
1110                                         fatalerror("Ran out of memory.");
1111                                 memcpy(mp, line, len);
1112                                 mp[len] = '\0';
1113                                 line = mp;
1114                         }
1115                         /* avoid possible leading and trailing whitespace */
1116                         p = strtok(line, " \t");
1117                         /* skip empty lines */
1118                         if (p == NULL)
1119                                 goto nextline;
1120                         /*
1121                          * if first chr is '@', check group membership
1122                          */
1123                         if (p[0] == '@') {
1124                                 int i = 0;
1125                                 struct group *grp;
1126
1127                                 if (p[1] == '\0') /* single @ matches anyone */
1128                                         found = 1;
1129                                 else {
1130                                         if ((grp = getgrnam(p+1)) == NULL)
1131                                                 goto nextline;
1132                                         /*
1133                                          * Check user's default group
1134                                          */
1135                                         if (pwset && grp->gr_gid == pw->pw_gid)
1136                                                 found = 1;
1137                                         /*
1138                                          * Check supplementary groups
1139                                          */
1140                                         while (!found && grp->gr_mem[i])
1141                                                 found = strcmp(name,
1142                                                         grp->gr_mem[i++])
1143                                                         == 0;
1144                                 }
1145                         }
1146                         /*
1147                          * Otherwise, just check for username match
1148                          */
1149                         else
1150                                 found = strcmp(p, name) == 0;
1151                         /*
1152                          * Save the rest of line to "residue" if matched
1153                          */
1154                         if (found && residue) {
1155                                 if ((p = strtok(NULL, "")) != NULL)
1156                                         p += strspn(p, " \t");
1157                                 if (p && *p) {
1158                                         if ((*residue = strdup(p)) == NULL)
1159                                                 fatalerror("Ran out of memory.");
1160                                 } else
1161                                         *residue = NULL;
1162                         }
1163 nextline:
1164                         if (mp)
1165                                 free(mp);
1166                 }
1167                 (void) fclose(fd);
1168         }
1169         return (found);
1170 }
1171
1172 /*
1173  * Terminate login as previous user, if any, resetting state;
1174  * used when USER command is given or login fails.
1175  */
1176 static void
1177 end_login()
1178 {
1179
1180         (void) seteuid((uid_t)0);
1181         if (logged_in && dowtmp)
1182                 ftpd_logwtmp(ttyline, "", NULL);
1183         pw = NULL;
1184 #ifdef  LOGIN_CAP
1185         setusercontext(NULL, getpwuid(0), (uid_t)0,
1186                        LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK);
1187 #endif
1188         logged_in = 0;
1189         guest = 0;
1190         dochroot = 0;
1191 }
1192
1193 #if !defined(NOPAM)
1194
1195 /*
1196  * the following code is stolen from imap-uw PAM authentication module and
1197  * login.c
1198  */
1199 #define COPY_STRING(s) (s ? strdup(s) : NULL)
1200
1201 struct cred_t {
1202         const char *uname;              /* user name */
1203         const char *pass;               /* password */
1204 };
1205 typedef struct cred_t cred_t;
1206
1207 static int
1208 auth_conv(int num_msg, const struct pam_message **msg,
1209           struct pam_response **resp, void *appdata)
1210 {
1211         int i;
1212         cred_t *cred = (cred_t *) appdata;
1213         struct pam_response *reply =
1214                         malloc(sizeof(struct pam_response) * num_msg);
1215
1216         for (i = 0; i < num_msg; i++) {
1217                 switch (msg[i]->msg_style) {
1218                 case PAM_PROMPT_ECHO_ON:        /* assume want user name */
1219                         reply[i].resp_retcode = PAM_SUCCESS;
1220                         reply[i].resp = COPY_STRING(cred->uname);
1221                         /* PAM frees resp. */
1222                         break;
1223                 case PAM_PROMPT_ECHO_OFF:       /* assume want password */
1224                         reply[i].resp_retcode = PAM_SUCCESS;
1225                         reply[i].resp = COPY_STRING(cred->pass);
1226                         /* PAM frees resp. */
1227                         break;
1228                 case PAM_TEXT_INFO:
1229                 case PAM_ERROR_MSG:
1230                         reply[i].resp_retcode = PAM_SUCCESS;
1231                         reply[i].resp = NULL;
1232                         break;
1233                 default:                        /* unknown message style */
1234                         free(reply);
1235                         return PAM_CONV_ERR;
1236                 }
1237         }
1238
1239         *resp = reply;
1240         return PAM_SUCCESS;
1241 }
1242
1243 /*
1244  * Attempt to authenticate the user using PAM.  Returns 0 if the user is
1245  * authenticated, or 1 if not authenticated.  If some sort of PAM system
1246  * error occurs (e.g., the "/etc/pam.conf" file is missing) then this
1247  * function returns -1.  This can be used as an indication that we should
1248  * fall back to a different authentication mechanism.
1249  */
1250 static int
1251 auth_pam(struct passwd **ppw, const char *pass)
1252 {
1253         pam_handle_t *pamh = NULL;
1254         const char *tmpl_user;
1255         const void *item;
1256         int rval;
1257         int e;
1258         cred_t auth_cred = { (*ppw)->pw_name, pass };
1259         struct pam_conv conv = { &auth_conv, &auth_cred };
1260
1261         e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh);
1262         if (e != PAM_SUCCESS) {
1263                 syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e));
1264                 return -1;
1265         }
1266
1267         e = pam_set_item(pamh, PAM_RHOST, remotehost);
1268         if (e != PAM_SUCCESS) {
1269                 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
1270                         pam_strerror(pamh, e));
1271                 return -1;
1272         }
1273
1274         e = pam_authenticate(pamh, 0);
1275         switch (e) {
1276         case PAM_SUCCESS:
1277                 /*
1278                  * With PAM we support the concept of a "template"
1279                  * user.  The user enters a login name which is
1280                  * authenticated by PAM, usually via a remote service
1281                  * such as RADIUS or TACACS+.  If authentication
1282                  * succeeds, a different but related "template" name
1283                  * is used for setting the credentials, shell, and
1284                  * home directory.  The name the user enters need only
1285                  * exist on the remote authentication server, but the
1286                  * template name must be present in the local password
1287                  * database.
1288                  *
1289                  * This is supported by two various mechanisms in the
1290                  * individual modules.  However, from the application's
1291                  * point of view, the template user is always passed
1292                  * back as a changed value of the PAM_USER item.
1293                  */
1294                 if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
1295                     PAM_SUCCESS) {
1296                         tmpl_user = (const char *) item;
1297                         if (strcmp((*ppw)->pw_name, tmpl_user) != 0)
1298                                 *ppw = getpwnam(tmpl_user);
1299                 } else
1300                         syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
1301                             pam_strerror(pamh, e));
1302                 rval = 0;
1303                 break;
1304
1305         case PAM_AUTH_ERR:
1306         case PAM_USER_UNKNOWN:
1307         case PAM_MAXTRIES:
1308                 rval = 1;
1309                 break;
1310
1311         default:
1312                 syslog(LOG_ERR, "auth_pam: %s", pam_strerror(pamh, e));
1313                 rval = -1;
1314                 break;
1315         }
1316
1317         if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
1318                 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1319                 rval = -1;
1320         }
1321         return rval;
1322 }
1323
1324 #endif /* !defined(NOPAM) */
1325
1326 void
1327 pass(passwd)
1328         char *passwd;
1329 {
1330         int rval;
1331         FILE *fd;
1332 #ifdef  LOGIN_CAP
1333         login_cap_t *lc = NULL;
1334 #endif
1335         char *chrootdir;
1336         char *residue = NULL;
1337
1338         if (logged_in || askpasswd == 0) {
1339                 reply(503, "Login with USER first.");
1340                 return;
1341         }
1342         askpasswd = 0;
1343         if (!guest) {           /* "ftp" is only account allowed no password */
1344                 if (pw == NULL) {
1345                         rval = 1;       /* failure below */
1346                         goto skip;
1347                 }
1348 #if !defined(NOPAM)
1349                 rval = auth_pam(&pw, passwd);
1350                 if (rval >= 0)
1351                         goto skip;
1352 #endif
1353 #ifdef SKEY
1354                 if (pwok)
1355                         rval = strcmp(pw->pw_passwd,
1356                             crypt(passwd, pw->pw_passwd));
1357                 if (rval)
1358                         rval = strcmp(pw->pw_passwd,
1359                             skey_crypt(passwd, pw->pw_passwd, pw, pwok));
1360 #else
1361                 rval = strcmp(pw->pw_passwd, crypt(passwd, pw->pw_passwd));
1362 #endif
1363                 /* The strcmp does not catch null passwords! */
1364                 if (*pw->pw_passwd == '\0' ||
1365                     (pw->pw_expire && time(NULL) >= pw->pw_expire))
1366                         rval = 1;       /* failure */
1367 skip:
1368                 /*
1369                  * If rval == 1, the user failed the authentication check
1370                  * above.  If rval == 0, either PAM or local authentication
1371                  * succeeded.
1372                  */
1373                 if (rval) {
1374                         reply(530, "Login incorrect.");
1375                         if (logging) {
1376                                 syslog(LOG_NOTICE,
1377                                     "FTP LOGIN FAILED FROM %s",
1378                                     remotehost);
1379                                 syslog(LOG_AUTHPRIV | LOG_NOTICE,
1380                                     "FTP LOGIN FAILED FROM %s, %s",
1381                                     remotehost, curname);
1382                         }
1383                         pw = NULL;
1384                         if (login_attempts++ >= 5) {
1385                                 syslog(LOG_NOTICE,
1386                                     "repeated login failures from %s",
1387                                     remotehost);
1388                                 exit(0);
1389                         }
1390                         return;
1391                 }
1392         }
1393 #ifdef SKEY
1394         pwok = 0;
1395 #endif
1396         login_attempts = 0;             /* this time successful */
1397         if (setegid((gid_t)pw->pw_gid) < 0) {
1398                 reply(550, "Can't set gid.");
1399                 return;
1400         }
1401         /* May be overridden by login.conf */
1402         (void) umask(defumask);
1403 #ifdef  LOGIN_CAP
1404         if ((lc = login_getpwclass(pw)) != NULL) {
1405                 char    remote_ip[MAXHOSTNAMELEN];
1406
1407                 getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
1408                         remote_ip, sizeof(remote_ip) - 1, NULL, 0,
1409                         NI_NUMERICHOST);
1410                 remote_ip[sizeof(remote_ip) - 1] = 0;
1411                 if (!auth_hostok(lc, remotehost, remote_ip)) {
1412                         syslog(LOG_INFO|LOG_AUTH,
1413                             "FTP LOGIN FAILED (HOST) as %s: permission denied.",
1414                             pw->pw_name);
1415                         reply(530, "Permission denied.\n");
1416                         pw = NULL;
1417                         return;
1418                 }
1419                 if (!auth_timeok(lc, time(NULL))) {
1420                         reply(530, "Login not available right now.\n");
1421                         pw = NULL;
1422                         return;
1423                 }
1424         }
1425         setusercontext(lc, pw, (uid_t)0,
1426                 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY|
1427                 LOGIN_SETRESOURCES|LOGIN_SETUMASK);
1428 #else
1429         setlogin(pw->pw_name);
1430         (void) initgroups(pw->pw_name, pw->pw_gid);
1431 #endif
1432
1433         /* open wtmp before chroot */
1434         if (dowtmp)
1435                 ftpd_logwtmp(ttyline, pw->pw_name,
1436                     (struct sockaddr *)&his_addr);
1437         logged_in = 1;
1438
1439         if (guest && stats && statfd < 0)
1440 #ifdef VIRTUAL_HOSTING
1441                 if ((statfd = open(thishost->statfile, O_WRONLY|O_APPEND)) < 0)
1442 #else
1443                 if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0)
1444 #endif
1445                         stats = 0;
1446
1447         dochroot =
1448                 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue)
1449 #ifdef  LOGIN_CAP       /* Allow login.conf configuration as well */
1450                 || login_getcapbool(lc, "ftp-chroot", 0)
1451 #endif
1452         ;
1453         chrootdir = NULL;
1454         /*
1455          * For a chrooted local user,
1456          * a) see whether ftpchroot(5) specifies a chroot directory,
1457          * b) extract the directory pathname from the line,
1458          * c) expand it to the absolute pathname if necessary.
1459          */
1460         if (dochroot && residue &&
1461             (chrootdir = strtok(residue, " \t")) != NULL &&
1462             chrootdir[0] != '/') {
1463                 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir);
1464                 if (chrootdir == NULL)
1465                         fatalerror("Ran out of memory.");
1466         }
1467         if (guest || dochroot) {
1468                 /*
1469                  * If no chroot directory set yet, use the login directory.
1470                  * Copy it so it can be modified while pw->pw_dir stays intact.
1471                  */
1472                 if (chrootdir == NULL &&
1473                     (chrootdir = strdup(pw->pw_dir)) == NULL)
1474                         fatalerror("Ran out of memory.");
1475                 /*
1476                  * Check for the "/chroot/./home" syntax,
1477                  * separate the chroot and home directory pathnames.
1478                  */
1479                 if ((homedir = strstr(chrootdir, "/./")) != NULL) {
1480                         *(homedir++) = '\0';    /* wipe '/' */
1481                         homedir++;              /* skip '.' */
1482                         /* so chrootdir can be freed later */
1483                         if ((homedir = strdup(homedir)) == NULL)
1484                                 fatalerror("Ran out of memory.");
1485                 } else {
1486                         /*
1487                          * We MUST do a chdir() after the chroot. Otherwise
1488                          * the old current directory will be accessible as "."
1489                          * outside the new root!
1490                          */
1491                         homedir = "/";
1492                 }
1493                 /*
1494                  * Finally, do chroot()
1495                  */
1496                 if (chroot(chrootdir) < 0) {
1497                         reply(550, "Can't change root.");
1498                         goto bad;
1499                 }
1500         } else  /* real user w/o chroot */
1501                 homedir = pw->pw_dir;
1502         /*
1503          * Set euid *before* doing chdir() so
1504          * a) the user won't be carried to a directory that he couldn't reach
1505          *    on his own due to no permission to upper path components,
1506          * b) NFS mounted homedirs w/restrictive permissions will be accessible
1507          *    (uid 0 has no root power over NFS if not mapped explicitly.)
1508          */
1509         if (seteuid((uid_t)pw->pw_uid) < 0) {
1510                 reply(550, "Can't set uid.");
1511                 goto bad;
1512         }
1513         if (chdir(homedir) < 0) {
1514                 if (guest || dochroot) {
1515                         reply(550, "Can't change to base directory.");
1516                         goto bad;
1517                 } else {
1518                         if (chdir("/") < 0) {
1519                                 reply(550, "Root is inaccessible.");
1520                                 goto bad;
1521                         }
1522                         lreply(230, "No directory! Logging in with home=/");
1523                 }
1524         }
1525
1526         /*
1527          * Display a login message, if it exists.
1528          * N.B. reply(230,) must follow the message.
1529          */
1530 #ifdef VIRTUAL_HOSTING
1531         if ((fd = fopen(thishost->loginmsg, "r")) != NULL) {
1532 #else
1533         if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) {
1534 #endif
1535                 char *cp, line[LINE_MAX];
1536
1537                 while (fgets(line, sizeof(line), fd) != NULL) {
1538                         if ((cp = strchr(line, '\n')) != NULL)
1539                                 *cp = '\0';
1540                         lreply(230, "%s", line);
1541                 }
1542                 (void) fflush(stdout);
1543                 (void) fclose(fd);
1544         }
1545         if (guest) {
1546                 if (ident != NULL)
1547                         free(ident);
1548                 ident = strdup(passwd);
1549                 if (ident == NULL)
1550                         fatalerror("Ran out of memory.");
1551
1552                 reply(230, "Guest login ok, access restrictions apply.");
1553 #ifdef SETPROCTITLE
1554 #ifdef VIRTUAL_HOSTING
1555                 if (thishost != firsthost)
1556                         snprintf(proctitle, sizeof(proctitle),
1557                                  "%s: anonymous(%s)/%s", remotehost, hostname,
1558                                  passwd);
1559                 else
1560 #endif
1561                         snprintf(proctitle, sizeof(proctitle),
1562                                  "%s: anonymous/%s", remotehost, passwd);
1563                 setproctitle("%s", proctitle);
1564 #endif /* SETPROCTITLE */
1565                 if (logging)
1566                         syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
1567                             remotehost, passwd);
1568         } else {
1569                 if (dochroot)
1570                         reply(230, "User %s logged in, "
1571                                    "access restrictions apply.", pw->pw_name);
1572                 else
1573                         reply(230, "User %s logged in.", pw->pw_name);
1574
1575 #ifdef SETPROCTITLE
1576                 snprintf(proctitle, sizeof(proctitle),
1577                          "%s: user/%s", remotehost, pw->pw_name);
1578                 setproctitle("%s", proctitle);
1579 #endif /* SETPROCTITLE */
1580                 if (logging)
1581                         syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
1582                             remotehost, pw->pw_name);
1583         }
1584 #ifdef  LOGIN_CAP
1585         login_close(lc);
1586 #endif
1587         if (chrootdir)
1588                 free(chrootdir);
1589         if (residue)
1590                 free(residue);
1591         return;
1592 bad:
1593         /* Forget all about it... */
1594 #ifdef  LOGIN_CAP
1595         login_close(lc);
1596 #endif
1597         if (chrootdir)
1598                 free(chrootdir);
1599         if (residue)
1600                 free(residue);
1601         end_login();
1602 }
1603
1604 void
1605 retrieve(cmd, name)
1606         char *cmd, *name;
1607 {
1608         FILE *fin, *dout;
1609         struct stat st;
1610         int (*closefunc) (FILE *);
1611         time_t start;
1612
1613         if (cmd == 0) {
1614                 fin = fopen(name, "r"), closefunc = fclose;
1615                 st.st_size = 0;
1616         } else {
1617                 char line[BUFSIZ];
1618
1619                 (void) snprintf(line, sizeof(line), cmd, name), name = line;
1620                 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
1621                 st.st_size = -1;
1622                 st.st_blksize = BUFSIZ;
1623         }
1624         if (fin == NULL) {
1625                 if (errno != 0) {
1626                         perror_reply(550, name);
1627                         if (cmd == 0) {
1628                                 LOGCMD("get", name);
1629                         }
1630                 }
1631                 return;
1632         }
1633         byte_count = -1;
1634         if (cmd == 0) {
1635                 if (fstat(fileno(fin), &st) < 0) {
1636                         perror_reply(550, name);
1637                         goto done;
1638                 }
1639                 if (!S_ISREG(st.st_mode)) {
1640                         if (guest) {
1641                                 reply(550, "%s: not a plain file.", name);
1642                                 goto done;
1643                         }
1644                         st.st_size = -1;
1645                         /* st.st_blksize is set for all descriptor types */
1646                 }
1647         }
1648         if (restart_point) {
1649                 if (type == TYPE_A) {
1650                         off_t i, n;
1651                         int c;
1652
1653                         n = restart_point;
1654                         i = 0;
1655                         while (i++ < n) {
1656                                 if ((c=getc(fin)) == EOF) {
1657                                         perror_reply(550, name);
1658                                         goto done;
1659                                 }
1660                                 if (c == '\n')
1661                                         i++;
1662                         }
1663                 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
1664                         perror_reply(550, name);
1665                         goto done;
1666                 }
1667         }
1668         dout = dataconn(name, st.st_size, "w");
1669         if (dout == NULL)
1670                 goto done;
1671         time(&start);
1672         send_data(fin, dout, st.st_blksize, st.st_size,
1673                   restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode));
1674         if (cmd == 0 && guest && stats)
1675                 logxfer(name, st.st_size, start);
1676         (void) fclose(dout);
1677         data = -1;
1678         pdata = -1;
1679 done:
1680         if (cmd == 0)
1681                 LOGBYTES("get", name, byte_count);
1682         (*closefunc)(fin);
1683 }
1684
1685 void
1686 store(name, mode, unique)
1687         char *name, *mode;
1688         int unique;
1689 {
1690         int fd;
1691         FILE *fout, *din;
1692         int (*closefunc) (FILE *);
1693
1694         if (*mode == 'a') {             /* APPE */
1695                 if (unique) {
1696                         /* Programming error */
1697                         syslog(LOG_ERR, "Internal: unique flag to APPE");
1698                         unique = 0;
1699                 }
1700                 if (guest && noguestmod) {
1701                         reply(550, "Appending to existing file denied");
1702                         goto err;
1703                 }
1704                 restart_point = 0;      /* not affected by preceding REST */
1705         }
1706         if (unique)                     /* STOU overrides REST */
1707                 restart_point = 0;
1708         if (guest && noguestmod) {
1709                 if (restart_point) {    /* guest STOR w/REST */
1710                         reply(550, "Modifying existing file denied");
1711                         goto err;
1712                 } else                  /* treat guest STOR as STOU */
1713                         unique = 1;
1714         }
1715
1716         if (restart_point)
1717                 mode = "r+";    /* so ASCII manual seek can work */
1718         if (unique) {
1719                 if ((fd = guniquefd(name, &name)) < 0)
1720                         goto err;
1721                 fout = fdopen(fd, mode);
1722         } else
1723                 fout = fopen(name, mode);
1724         closefunc = fclose;
1725         if (fout == NULL) {
1726                 perror_reply(553, name);
1727                 goto err;
1728         }
1729         byte_count = -1;
1730         if (restart_point) {
1731                 if (type == TYPE_A) {
1732                         off_t i, n;
1733                         int c;
1734
1735                         n = restart_point;
1736                         i = 0;
1737                         while (i++ < n) {
1738                                 if ((c=getc(fout)) == EOF) {
1739                                         perror_reply(550, name);
1740                                         goto done;
1741                                 }
1742                                 if (c == '\n')
1743                                         i++;
1744                         }
1745                         /*
1746                          * We must do this seek to "current" position
1747                          * because we are changing from reading to
1748                          * writing.
1749                          */
1750                         if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) {
1751                                 perror_reply(550, name);
1752                                 goto done;
1753                         }
1754                 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
1755                         perror_reply(550, name);
1756                         goto done;
1757                 }
1758         }
1759         din = dataconn(name, (off_t)-1, "r");
1760         if (din == NULL)
1761                 goto done;
1762         if (receive_data(din, fout) == 0) {
1763                 if (unique)
1764                         reply(226, "Transfer complete (unique file name:%s).",
1765                             name);
1766                 else
1767                         reply(226, "Transfer complete.");
1768         }
1769         (void) fclose(din);
1770         data = -1;
1771         pdata = -1;
1772 done:
1773         LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count);
1774         (*closefunc)(fout);
1775         return;
1776 err:
1777         LOGCMD(*mode == 'a' ? "append" : "put" , name);
1778         return;
1779 }
1780
1781 static FILE *
1782 getdatasock(mode)
1783         char *mode;
1784 {
1785         int on = 1, s, t, tries;
1786
1787         if (data >= 0)
1788                 return (fdopen(data, mode));
1789
1790         s = socket(data_dest.su_family, SOCK_STREAM, 0);
1791         if (s < 0)
1792                 goto bad;
1793         if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
1794                 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m");
1795         /* anchor socket to avoid multi-homing problems */
1796         data_source = ctrl_addr;
1797         data_source.su_port = htons(dataport);
1798         (void) seteuid((uid_t)0);
1799         for (tries = 1; ; tries++) {
1800                 if (bind(s, (struct sockaddr *)&data_source,
1801                     data_source.su_len) >= 0)
1802                         break;
1803                 if (errno != EADDRINUSE || tries > 10)
1804                         goto bad;
1805                 sleep(tries);
1806         }
1807         (void) seteuid((uid_t)pw->pw_uid);
1808 #ifdef IP_TOS
1809         if (data_source.su_family == AF_INET)
1810       {
1811         on = IPTOS_THROUGHPUT;
1812         if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0)
1813                 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m");
1814       }
1815 #endif
1816 #ifdef TCP_NOPUSH
1817         /*
1818          * Turn off push flag to keep sender TCP from sending short packets
1819          * at the boundaries of each write().  Should probably do a SO_SNDBUF
1820          * to set the send buffer size as well, but that may not be desirable
1821          * in heavy-load situations.
1822          */
1823         on = 1;
1824         if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0)
1825                 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m");
1826 #endif
1827 #ifdef SO_SNDBUF
1828         on = 65536;
1829         if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0)
1830                 syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m");
1831 #endif
1832
1833         return (fdopen(s, mode));
1834 bad:
1835         /* Return the real value of errno (close may change it) */
1836         t = errno;
1837         (void) seteuid((uid_t)pw->pw_uid);
1838         (void) close(s);
1839         errno = t;
1840         return (NULL);
1841 }
1842
1843 static FILE *
1844 dataconn(name, size, mode)
1845         char *name;
1846         off_t size;
1847         char *mode;
1848 {
1849         char sizebuf[32];
1850         FILE *file;
1851         int retry = 0, tos, conerrno;
1852
1853         file_size = size;
1854         byte_count = 0;
1855         if (size != (off_t) -1)
1856                 (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", size);
1857         else
1858                 *sizebuf = '\0';
1859         if (pdata >= 0) {
1860                 union sockunion from;
1861                 int flags;
1862                 int s, fromlen = ctrl_addr.su_len;
1863                 struct timeval timeout;
1864                 fd_set set;
1865
1866                 FD_ZERO(&set);
1867                 FD_SET(pdata, &set);
1868
1869                 timeout.tv_usec = 0;
1870                 timeout.tv_sec = 120;
1871
1872                 /*
1873                  * Granted a socket is in the blocking I/O mode,
1874                  * accept() will block after a successful select()
1875                  * if the selected connection dies in between.
1876                  * Therefore set the non-blocking I/O flag here.
1877                  */
1878                 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1879                     fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1)
1880                         goto pdata_err;
1881                 if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) <= 0 ||
1882                     (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0)
1883                         goto pdata_err;
1884                 (void) close(pdata);
1885                 pdata = s;
1886                 /*
1887                  * Unset the inherited non-blocking I/O flag
1888                  * on the child socket so stdio can work on it.
1889                  */
1890                 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1891                     fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1)
1892                         goto pdata_err;
1893 #ifdef IP_TOS
1894                 if (from.su_family == AF_INET)
1895               {
1896                 tos = IPTOS_THROUGHPUT;
1897                 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
1898                         syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m");
1899               }
1900 #endif
1901                 reply(150, "Opening %s mode data connection for '%s'%s.",
1902                      type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1903                 return (fdopen(pdata, mode));
1904 pdata_err:
1905                 reply(425, "Can't open data connection.");
1906                 (void) close(pdata);
1907                 pdata = -1;
1908                 return (NULL);
1909         }
1910         if (data >= 0) {
1911                 reply(125, "Using existing data connection for '%s'%s.",
1912                     name, sizebuf);
1913                 usedefault = 1;
1914                 return (fdopen(data, mode));
1915         }
1916         if (usedefault)
1917                 data_dest = his_addr;
1918         usedefault = 1;
1919         do {
1920                 file = getdatasock(mode);
1921                 if (file == NULL) {
1922                         char hostbuf[BUFSIZ], portbuf[BUFSIZ];
1923                         getnameinfo((struct sockaddr *)&data_source,
1924                                 data_source.su_len, hostbuf, sizeof(hostbuf) - 1,
1925                                 portbuf, sizeof(portbuf),
1926                                 NI_NUMERICHOST|NI_NUMERICSERV);
1927                         reply(425, "Can't create data socket (%s,%s): %s.",
1928                                 hostbuf, portbuf, strerror(errno));
1929                         return (NULL);
1930                 }
1931                 data = fileno(file);
1932                 conerrno = 0;
1933                 if (connect(data, (struct sockaddr *)&data_dest,
1934                     data_dest.su_len) == 0)
1935                         break;
1936                 conerrno = errno;
1937                 (void) fclose(file);
1938                 data = -1;
1939                 if (conerrno == EADDRINUSE) {
1940                         sleep((unsigned) swaitint);
1941                         retry += swaitint;
1942                 } else {
1943                         break;
1944                 }
1945         } while (retry <= swaitmax);
1946         if (conerrno != 0) {
1947                 perror_reply(425, "Can't build data connection");
1948                 return (NULL);
1949         }
1950         reply(150, "Opening %s mode data connection for '%s'%s.",
1951              type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1952         return (file);
1953 }
1954
1955 /*
1956  * Tranfer the contents of "instr" to "outstr" peer using the appropriate
1957  * encapsulation of the data subject to Mode, Structure, and Type.
1958  *
1959  * NB: Form isn't handled.
1960  */
1961 static int
1962 send_data(instr, outstr, blksize, filesize, isreg)
1963         FILE *instr, *outstr;
1964         off_t blksize;
1965         off_t filesize;
1966         int isreg;
1967 {
1968         int c, filefd, netfd;
1969         char *buf;
1970         off_t cnt;
1971
1972         transflag++;
1973         switch (type) {
1974
1975         case TYPE_A:
1976                 while ((c = getc(instr)) != EOF) {
1977                         if (recvurg)
1978                                 goto got_oob;
1979                         byte_count++;
1980                         if (c == '\n') {
1981                                 if (ferror(outstr))
1982                                         goto data_err;
1983                                 (void) putc('\r', outstr);
1984                         }
1985                         (void) putc(c, outstr);
1986                 }
1987                 if (recvurg)
1988                         goto got_oob;
1989                 fflush(outstr);
1990                 transflag = 0;
1991                 if (ferror(instr))
1992                         goto file_err;
1993                 if (ferror(outstr))
1994                         goto data_err;
1995                 reply(226, "Transfer complete.");
1996                 return (0);
1997
1998         case TYPE_I:
1999         case TYPE_L:
2000                 /*
2001                  * isreg is only set if we are not doing restart and we
2002                  * are sending a regular file
2003                  */
2004                 netfd = fileno(outstr);
2005                 filefd = fileno(instr);
2006
2007                 if (isreg) {
2008
2009                         off_t offset;
2010                         int err;
2011
2012                         err = cnt = offset = 0;
2013
2014                         while (err != -1 && filesize > 0) {
2015                                 err = sendfile(filefd, netfd, offset, 0,
2016                                         (struct sf_hdtr *) NULL, &cnt, 0);
2017                                 /*
2018                                  * Calculate byte_count before OOB processing.
2019                                  * It can be used in myoob() later.
2020                                  */
2021                                 byte_count += cnt;
2022                                 if (recvurg)
2023                                         goto got_oob;
2024                                 offset += cnt;
2025                                 filesize -= cnt;
2026
2027                                 if (err == -1) {
2028                                         if (!cnt)
2029                                                 goto oldway;
2030
2031                                         goto data_err;
2032                                 }
2033                         }
2034
2035                         transflag = 0;
2036                         reply(226, "Transfer complete.");
2037                         return (0);
2038                 }
2039
2040 oldway:
2041                 if ((buf = malloc((u_int)blksize)) == NULL) {
2042                         transflag = 0;
2043                         perror_reply(451, "Local resource failure: malloc");
2044                         return (-1);
2045                 }
2046
2047                 while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 &&
2048                     write(netfd, buf, cnt) == cnt)
2049                         byte_count += cnt;
2050                 transflag = 0;
2051                 (void)free(buf);
2052                 if (cnt != 0) {
2053                         if (cnt < 0)
2054                                 goto file_err;
2055                         goto data_err;
2056                 }
2057                 reply(226, "Transfer complete.");
2058                 return (0);
2059         default:
2060                 transflag = 0;
2061                 reply(550, "Unimplemented TYPE %d in send_data", type);
2062                 return (-1);
2063         }
2064
2065 data_err:
2066         transflag = 0;
2067         perror_reply(426, "Data connection");
2068         return (-1);
2069
2070 file_err:
2071         transflag = 0;
2072         perror_reply(551, "Error on input file");
2073         return (-1);
2074
2075 got_oob:
2076         myoob();
2077         recvurg = 0;
2078         transflag = 0;
2079         return (-1);
2080 }
2081
2082 /*
2083  * Transfer data from peer to "outstr" using the appropriate encapulation of
2084  * the data subject to Mode, Structure, and Type.
2085  *
2086  * N.B.: Form isn't handled.
2087  */
2088 static int
2089 receive_data(instr, outstr)
2090         FILE *instr, *outstr;
2091 {
2092         int c;
2093         int cnt, bare_lfs;
2094         char buf[BUFSIZ];
2095
2096         transflag++;
2097         bare_lfs = 0;
2098
2099         switch (type) {
2100
2101         case TYPE_I:
2102         case TYPE_L:
2103                 while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) {
2104                         if (recvurg)
2105                                 goto got_oob;
2106                         if (write(fileno(outstr), buf, cnt) != cnt)
2107                                 goto file_err;
2108                         byte_count += cnt;
2109                 }
2110                 if (recvurg)
2111                         goto got_oob;
2112                 if (cnt < 0)
2113                         goto data_err;
2114                 transflag = 0;
2115                 return (0);
2116
2117         case TYPE_E:
2118                 reply(553, "TYPE E not implemented.");
2119                 transflag = 0;
2120                 return (-1);
2121
2122         case TYPE_A:
2123                 while ((c = getc(instr)) != EOF) {
2124                         if (recvurg)
2125                                 goto got_oob;
2126                         byte_count++;
2127                         if (c == '\n')
2128                                 bare_lfs++;
2129                         while (c == '\r') {
2130                                 if (ferror(outstr))
2131                                         goto data_err;
2132                                 if ((c = getc(instr)) != '\n') {
2133                                         (void) putc ('\r', outstr);
2134                                         if (c == '\0' || c == EOF)
2135                                                 goto contin2;
2136                                 }
2137                         }
2138                         (void) putc(c, outstr);
2139         contin2:        ;
2140                 }
2141                 if (recvurg)
2142                         goto got_oob;
2143                 fflush(outstr);
2144                 if (ferror(instr))
2145                         goto data_err;
2146                 if (ferror(outstr))
2147                         goto file_err;
2148                 transflag = 0;
2149                 if (bare_lfs) {
2150                         lreply(226,
2151                 "WARNING! %d bare linefeeds received in ASCII mode",
2152                             bare_lfs);
2153                 (void)printf("   File may not have transferred correctly.\r\n");
2154                 }
2155                 return (0);
2156         default:
2157                 reply(550, "Unimplemented TYPE %d in receive_data", type);
2158                 transflag = 0;
2159                 return (-1);
2160         }
2161
2162 data_err:
2163         transflag = 0;
2164         perror_reply(426, "Data Connection");
2165         return (-1);
2166
2167 file_err:
2168         transflag = 0;
2169         perror_reply(452, "Error writing file");
2170         return (-1);
2171
2172 got_oob:
2173         myoob();
2174         recvurg = 0;
2175         transflag = 0;
2176         return (-1);
2177 }
2178
2179 void
2180 statfilecmd(filename)
2181         char *filename;
2182 {
2183         FILE *fin;
2184         int atstart;
2185         int c;
2186         char line[LINE_MAX];
2187
2188         (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename);
2189         fin = ftpd_popen(line, "r");
2190         lreply(211, "status of %s:", filename);
2191         atstart = 1;
2192         while ((c = getc(fin)) != EOF) {
2193                 if (c == '\n') {
2194                         if (ferror(stdout)){
2195                                 perror_reply(421, "control connection");
2196                                 (void) ftpd_pclose(fin);
2197                                 dologout(1);
2198                                 /* NOTREACHED */
2199                         }
2200                         if (ferror(fin)) {
2201                                 perror_reply(551, filename);
2202                                 (void) ftpd_pclose(fin);
2203                                 return;
2204                         }
2205                         (void) putc('\r', stdout);
2206                 }
2207                 /*
2208                  * RFC 959 says neutral text should be prepended before
2209                  * a leading 3-digit number followed by whitespace, but
2210                  * many ftp clients can be confused by any leading digits,
2211                  * as a matter of fact.
2212                  */
2213                 if (atstart && isdigit(c))
2214                         (void) putc(' ', stdout);
2215                 (void) putc(c, stdout);
2216                 atstart = (c == '\n');
2217         }
2218         (void) ftpd_pclose(fin);
2219         reply(211, "End of Status");
2220 }
2221
2222 void
2223 statcmd()
2224 {
2225         union sockunion *su;
2226         u_char *a, *p;
2227         char hname[NI_MAXHOST];
2228         int ispassive;
2229
2230         if (hostinfo) {
2231                 lreply(211, "%s FTP server status:", hostname);
2232                 printf("     %s\r\n", version);
2233         } else
2234                 lreply(211, "FTP server status:");
2235         printf("     Connected to %s", remotehost);
2236         if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
2237                          hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) {
2238                 if (strcmp(hname, remotehost) != 0)
2239                         printf(" (%s)", hname);
2240         }
2241         printf("\r\n");
2242         if (logged_in) {
2243                 if (guest)
2244                         printf("     Logged in anonymously\r\n");
2245                 else
2246                         printf("     Logged in as %s\r\n", pw->pw_name);
2247         } else if (askpasswd)
2248                 printf("     Waiting for password\r\n");
2249         else
2250                 printf("     Waiting for user name\r\n");
2251         printf("     TYPE: %s", typenames[type]);
2252         if (type == TYPE_A || type == TYPE_E)
2253                 printf(", FORM: %s", formnames[form]);
2254         if (type == TYPE_L)
2255 #if NBBY == 8
2256                 printf(" %d", NBBY);
2257 #else
2258                 printf(" %d", bytesize);        /* need definition! */
2259 #endif
2260         printf("; STRUcture: %s; transfer MODE: %s\r\n",
2261             strunames[stru], modenames[mode]);
2262         if (data != -1)
2263                 printf("     Data connection open\r\n");
2264         else if (pdata != -1) {
2265                 ispassive = 1;
2266                 su = &pasv_addr;
2267                 goto printaddr;
2268         } else if (usedefault == 0) {
2269                 ispassive = 0;
2270                 su = &data_dest;
2271 printaddr:
2272 #define UC(b) (((int) b) & 0xff)
2273                 if (epsvall) {
2274                         printf("     EPSV only mode (EPSV ALL)\r\n");
2275                         goto epsvonly;
2276                 }
2277
2278                 /* PORT/PASV */
2279                 if (su->su_family == AF_INET) {
2280                         a = (u_char *) &su->su_sin.sin_addr;
2281                         p = (u_char *) &su->su_sin.sin_port;
2282                         printf("     %s (%d,%d,%d,%d,%d,%d)\r\n",
2283                                 ispassive ? "PASV" : "PORT",
2284                                 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2285                                 UC(p[0]), UC(p[1]));
2286                 }
2287
2288                 /* LPRT/LPSV */
2289             {
2290                 int alen, af, i;
2291
2292                 switch (su->su_family) {
2293                 case AF_INET:
2294                         a = (u_char *) &su->su_sin.sin_addr;
2295                         p = (u_char *) &su->su_sin.sin_port;
2296                         alen = sizeof(su->su_sin.sin_addr);
2297                         af = 4;
2298                         break;
2299                 case AF_INET6:
2300                         a = (u_char *) &su->su_sin6.sin6_addr;
2301                         p = (u_char *) &su->su_sin6.sin6_port;
2302                         alen = sizeof(su->su_sin6.sin6_addr);
2303                         af = 6;
2304                         break;
2305                 default:
2306                         af = 0;
2307                         break;
2308                 }
2309                 if (af) {
2310                         printf("     %s (%d,%d,", ispassive ? "LPSV" : "LPRT",
2311                                 af, alen);
2312                         for (i = 0; i < alen; i++)
2313                                 printf("%d,", UC(a[i]));
2314                         printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1]));
2315                 }
2316             }
2317
2318 epsvonly:;
2319                 /* EPRT/EPSV */
2320             {
2321                 int af;
2322
2323                 switch (su->su_family) {
2324                 case AF_INET:
2325                         af = 1;
2326                         break;
2327                 case AF_INET6:
2328                         af = 2;
2329                         break;
2330                 default:
2331                         af = 0;
2332                         break;
2333                 }
2334                 if (af) {
2335                         union sockunion tmp;
2336
2337                         tmp = *su;
2338                         if (tmp.su_family == AF_INET6)
2339                                 tmp.su_sin6.sin6_scope_id = 0;
2340                         if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len,
2341                                         hname, sizeof(hname) - 1, NULL, 0,
2342                                         NI_NUMERICHOST)) {
2343                                 printf("     %s |%d|%s|%d|\r\n",
2344                                         ispassive ? "EPSV" : "EPRT",
2345                                         af, hname, htons(tmp.su_port));
2346                         }
2347                 }
2348             }
2349 #undef UC
2350         } else
2351                 printf("     No data connection\r\n");
2352         reply(211, "End of status");
2353 }
2354
2355 void
2356 fatalerror(s)
2357         char *s;
2358 {
2359
2360         reply(451, "Error in server: %s\n", s);
2361         reply(221, "Closing connection due to server error.");
2362         dologout(0);
2363         /* NOTREACHED */
2364 }
2365
2366 void
2367 #if __STDC__
2368 reply(int n, const char *fmt, ...)
2369 #else
2370 reply(n, fmt, va_alist)
2371         int n;
2372         char *fmt;
2373         va_dcl
2374 #endif
2375 {
2376         va_list ap;
2377 #if __STDC__
2378         va_start(ap, fmt);
2379 #else
2380         va_start(ap);
2381 #endif
2382         (void)printf("%d ", n);
2383         (void)vprintf(fmt, ap);
2384         (void)printf("\r\n");
2385         (void)fflush(stdout);
2386         if (ftpdebug) {
2387                 syslog(LOG_DEBUG, "<--- %d ", n);
2388                 vsyslog(LOG_DEBUG, fmt, ap);
2389         }
2390 }
2391
2392 void
2393 #if __STDC__
2394 lreply(int n, const char *fmt, ...)
2395 #else
2396 lreply(n, fmt, va_alist)
2397         int n;
2398         char *fmt;
2399         va_dcl
2400 #endif
2401 {
2402         va_list ap;
2403 #if __STDC__
2404         va_start(ap, fmt);
2405 #else
2406         va_start(ap);
2407 #endif
2408         (void)printf("%d- ", n);
2409         (void)vprintf(fmt, ap);
2410         (void)printf("\r\n");
2411         (void)fflush(stdout);
2412         if (ftpdebug) {
2413                 syslog(LOG_DEBUG, "<--- %d- ", n);
2414                 vsyslog(LOG_DEBUG, fmt, ap);
2415         }
2416 }
2417
2418 static void
2419 ack(s)
2420         char *s;
2421 {
2422
2423         reply(250, "%s command successful.", s);
2424 }
2425
2426 void
2427 nack(s)
2428         char *s;
2429 {
2430
2431         reply(502, "%s command not implemented.", s);
2432 }
2433
2434 /* ARGSUSED */
2435 void
2436 yyerror(s)
2437         char *s;
2438 {
2439         char *cp;
2440
2441         if ((cp = strchr(cbuf,'\n')))
2442                 *cp = '\0';
2443         reply(500, "'%s': command not understood.", cbuf);
2444 }
2445
2446 void
2447 delete(name)
2448         char *name;
2449 {
2450         struct stat st;
2451
2452         LOGCMD("delete", name);
2453         if (lstat(name, &st) < 0) {
2454                 perror_reply(550, name);
2455                 return;
2456         }
2457         if ((st.st_mode&S_IFMT) == S_IFDIR) {
2458                 if (rmdir(name) < 0) {
2459                         perror_reply(550, name);
2460                         return;
2461                 }
2462                 goto done;
2463         }
2464         if (unlink(name) < 0) {
2465                 perror_reply(550, name);
2466                 return;
2467         }
2468 done:
2469         ack("DELE");
2470 }
2471
2472 void
2473 cwd(path)
2474         char *path;
2475 {
2476
2477         if (chdir(path) < 0)
2478                 perror_reply(550, path);
2479         else
2480                 ack("CWD");
2481 }
2482
2483 void
2484 makedir(name)
2485         char *name;
2486 {
2487         char *s;
2488
2489         LOGCMD("mkdir", name);
2490         if (guest && noguestmkd)
2491                 reply(550, "%s: permission denied", name);
2492         else if (mkdir(name, 0777) < 0)
2493                 perror_reply(550, name);
2494         else {
2495                 if ((s = doublequote(name)) == NULL)
2496                         fatalerror("Ran out of memory.");
2497                 reply(257, "\"%s\" directory created.", s);
2498                 free(s);
2499         }
2500 }
2501
2502 void
2503 removedir(name)
2504         char *name;
2505 {
2506
2507         LOGCMD("rmdir", name);
2508         if (rmdir(name) < 0)
2509                 perror_reply(550, name);
2510         else
2511                 ack("RMD");
2512 }
2513
2514 void
2515 pwd()
2516 {
2517         char *s, path[MAXPATHLEN + 1];
2518
2519         if (getwd(path) == (char *)NULL)
2520                 reply(550, "%s.", path);
2521         else {
2522                 if ((s = doublequote(path)) == NULL)
2523                         fatalerror("Ran out of memory.");
2524                 reply(257, "\"%s\" is current directory.", s);
2525                 free(s);
2526         }
2527 }
2528
2529 char *
2530 renamefrom(name)
2531         char *name;
2532 {
2533         struct stat st;
2534
2535         if (lstat(name, &st) < 0) {
2536                 perror_reply(550, name);
2537                 return ((char *)0);
2538         }
2539         reply(350, "File exists, ready for destination name");
2540         return (name);
2541 }
2542
2543 void
2544 renamecmd(from, to)
2545         char *from, *to;
2546 {
2547         struct stat st;
2548
2549         LOGCMD2("rename", from, to);
2550
2551         if (guest && (stat(to, &st) == 0)) {
2552                 reply(550, "%s: permission denied", to);
2553                 return;
2554         }
2555
2556         if (rename(from, to) < 0)
2557                 perror_reply(550, "rename");
2558         else
2559                 ack("RNTO");
2560 }
2561
2562 static void
2563 dolog(who)
2564         struct sockaddr *who;
2565 {
2566         int error;
2567
2568         realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len);
2569
2570 #ifdef SETPROCTITLE
2571 #ifdef VIRTUAL_HOSTING
2572         if (thishost != firsthost)
2573                 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)",
2574                          remotehost, hostname);
2575         else
2576 #endif
2577                 snprintf(proctitle, sizeof(proctitle), "%s: connected",
2578                          remotehost);
2579         setproctitle("%s", proctitle);
2580 #endif /* SETPROCTITLE */
2581
2582         if (logging) {
2583 #ifdef VIRTUAL_HOSTING
2584                 if (thishost != firsthost)
2585                         syslog(LOG_INFO, "connection from %s (to %s)",
2586                                remotehost, hostname);
2587                 else
2588 #endif
2589                 {
2590                         char    who_name[MAXHOSTNAMELEN];
2591
2592                         error = getnameinfo(who, who->sa_len,
2593                                             who_name, sizeof(who_name) - 1,
2594                                             NULL, 0, NI_NUMERICHOST);
2595                         syslog(LOG_INFO, "connection from %s (%s)", remotehost,
2596                                error == 0 ? who_name : "");
2597                 }
2598         }
2599 }
2600
2601 /*
2602  * Record logout in wtmp file
2603  * and exit with supplied status.
2604  */
2605 void
2606 dologout(status)
2607         int status;
2608 {
2609         /*
2610          * Prevent reception of SIGURG from resulting in a resumption
2611          * back to the main program loop.
2612          */
2613         transflag = 0;
2614
2615         if (logged_in && dowtmp) {
2616                 (void) seteuid((uid_t)0);
2617                 ftpd_logwtmp(ttyline, "", NULL);
2618         }
2619         /* beware of flushing buffers after a SIGPIPE */
2620         _exit(status);
2621 }
2622
2623 static void
2624 sigurg(signo)
2625         int signo;
2626 {
2627
2628         recvurg = 1;
2629 }
2630
2631 static void
2632 myoob()
2633 {
2634         char *cp;
2635
2636         /* only process if transfer occurring */
2637         if (!transflag)
2638                 return;
2639         cp = tmpline;
2640         if (getline(cp, 7, stdin) == NULL) {
2641                 reply(221, "You could at least say goodbye.");
2642                 dologout(0);
2643         }
2644         upper(cp);
2645         if (strcmp(cp, "ABOR\r\n") == 0) {
2646                 tmpline[0] = '\0';
2647                 reply(426, "Transfer aborted. Data connection closed.");
2648                 reply(226, "Abort successful");
2649         }
2650         if (strcmp(cp, "STAT\r\n") == 0) {
2651                 tmpline[0] = '\0';
2652                 if (file_size != (off_t) -1)
2653                         reply(213, "Status: %qd of %qd bytes transferred",
2654                             byte_count, file_size);
2655                 else
2656                         reply(213, "Status: %qd bytes transferred", byte_count);
2657         }
2658 }
2659
2660 /*
2661  * Note: a response of 425 is not mentioned as a possible response to
2662  *      the PASV command in RFC959. However, it has been blessed as
2663  *      a legitimate response by Jon Postel in a telephone conversation
2664  *      with Rick Adams on 25 Jan 89.
2665  */
2666 void
2667 passive()
2668 {
2669         int len, on;
2670         char *p, *a;
2671
2672         if (pdata >= 0)         /* close old port if one set */
2673                 close(pdata);
2674
2675         pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2676         if (pdata < 0) {
2677                 perror_reply(425, "Can't open passive connection");
2678                 return;
2679         }
2680         on = 1;
2681         if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2682                 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2683
2684         (void) seteuid((uid_t)0);
2685
2686 #ifdef IP_PORTRANGE
2687         if (ctrl_addr.su_family == AF_INET) {
2688             on = restricted_data_ports ? IP_PORTRANGE_HIGH
2689                                        : IP_PORTRANGE_DEFAULT;
2690
2691             if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2692                             &on, sizeof(on)) < 0)
2693                     goto pasv_error;
2694         }
2695 #endif
2696 #ifdef IPV6_PORTRANGE
2697         if (ctrl_addr.su_family == AF_INET6) {
2698             on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2699                                        : IPV6_PORTRANGE_DEFAULT;
2700
2701             if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2702                             &on, sizeof(on)) < 0)
2703                     goto pasv_error;
2704         }
2705 #endif
2706
2707         pasv_addr = ctrl_addr;
2708         pasv_addr.su_port = 0;
2709         if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0)
2710                 goto pasv_error;
2711
2712         (void) seteuid((uid_t)pw->pw_uid);
2713
2714         len = sizeof(pasv_addr);
2715         if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2716                 goto pasv_error;
2717         if (listen(pdata, 1) < 0)
2718                 goto pasv_error;
2719         if (pasv_addr.su_family == AF_INET)
2720                 a = (char *) &pasv_addr.su_sin.sin_addr;
2721         else if (pasv_addr.su_family == AF_INET6 &&
2722                  IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr))
2723                 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
2724         else
2725                 goto pasv_error;
2726
2727         p = (char *) &pasv_addr.su_port;
2728
2729 #define UC(b) (((int) b) & 0xff)
2730
2731         reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
2732                 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
2733         return;
2734
2735 pasv_error:
2736         (void) seteuid((uid_t)pw->pw_uid);
2737         (void) close(pdata);
2738         pdata = -1;
2739         perror_reply(425, "Can't open passive connection");
2740         return;
2741 }
2742
2743 /*
2744  * Long Passive defined in RFC 1639.
2745  *     228 Entering Long Passive Mode
2746  *         (af, hal, h1, h2, h3,..., pal, p1, p2...)
2747  */
2748
2749 void
2750 long_passive(cmd, pf)
2751         char *cmd;
2752         int pf;
2753 {
2754         int len, on;
2755         char *p, *a;
2756
2757         if (pdata >= 0)         /* close old port if one set */
2758                 close(pdata);
2759
2760         if (pf != PF_UNSPEC) {
2761                 if (ctrl_addr.su_family != pf) {
2762                         switch (ctrl_addr.su_family) {
2763                         case AF_INET:
2764                                 pf = 1;
2765                                 break;
2766                         case AF_INET6:
2767                                 pf = 2;
2768                                 break;
2769                         default:
2770                                 pf = 0;
2771                                 break;
2772                         }
2773                         /*
2774                          * XXX
2775                          * only EPRT/EPSV ready clients will understand this
2776                          */
2777                         if (strcmp(cmd, "EPSV") == 0 && pf) {
2778                                 reply(522, "Network protocol mismatch, "
2779                                         "use (%d)", pf);
2780                         } else
2781                                 reply(501, "Network protocol mismatch"); /*XXX*/
2782
2783                         return;
2784                 }
2785         }
2786
2787         pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2788         if (pdata < 0) {
2789                 perror_reply(425, "Can't open passive connection");
2790                 return;
2791         }
2792         on = 1;
2793         if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2794                 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2795
2796         (void) seteuid((uid_t)0);
2797
2798         pasv_addr = ctrl_addr;
2799         pasv_addr.su_port = 0;
2800         len = pasv_addr.su_len;
2801
2802 #ifdef IP_PORTRANGE
2803         if (ctrl_addr.su_family == AF_INET) {
2804             on = restricted_data_ports ? IP_PORTRANGE_HIGH
2805                                        : IP_PORTRANGE_DEFAULT;
2806
2807             if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2808                             &on, sizeof(on)) < 0)
2809                     goto pasv_error;
2810         }
2811 #endif
2812 #ifdef IPV6_PORTRANGE
2813         if (ctrl_addr.su_family == AF_INET6) {
2814             on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2815                                        : IPV6_PORTRANGE_DEFAULT;
2816
2817             if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2818                             &on, sizeof(on)) < 0)
2819                     goto pasv_error;
2820         }
2821 #endif
2822
2823         if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0)
2824                 goto pasv_error;
2825
2826         (void) seteuid((uid_t)pw->pw_uid);
2827
2828         if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2829                 goto pasv_error;
2830         if (listen(pdata, 1) < 0)
2831                 goto pasv_error;
2832
2833 #define UC(b) (((int) b) & 0xff)
2834
2835         if (strcmp(cmd, "LPSV") == 0) {
2836                 p = (char *)&pasv_addr.su_port;
2837                 switch (pasv_addr.su_family) {
2838                 case AF_INET:
2839                         a = (char *) &pasv_addr.su_sin.sin_addr;
2840                 v4_reply:
2841                         reply(228,
2842 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)",
2843                               4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2844                               2, UC(p[0]), UC(p[1]));
2845                         return;
2846                 case AF_INET6:
2847                         if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) {
2848                                 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
2849                                 goto v4_reply;
2850                         }
2851                         a = (char *) &pasv_addr.su_sin6.sin6_addr;
2852                         reply(228,
2853 "Entering Long Passive Mode "
2854 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)",
2855                               6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2856                               UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]),
2857                               UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]),
2858                               UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]),
2859                               2, UC(p[0]), UC(p[1]));
2860                         return;
2861                 }
2862         } else if (strcmp(cmd, "EPSV") == 0) {
2863                 switch (pasv_addr.su_family) {
2864                 case AF_INET:
2865                 case AF_INET6:
2866                         reply(229, "Entering Extended Passive Mode (|||%d|)",
2867                                 ntohs(pasv_addr.su_port));
2868                         return;
2869                 }
2870         } else {
2871                 /* more proper error code? */
2872         }
2873
2874 pasv_error:
2875         (void) seteuid((uid_t)pw->pw_uid);
2876         (void) close(pdata);
2877         pdata = -1;
2878         perror_reply(425, "Can't open passive connection");
2879         return;
2880 }
2881
2882 /*
2883  * Generate unique name for file with basename "local"
2884  * and open the file in order to avoid possible races.
2885  * Try "local" first, then "local.1", "local.2" etc, up to "local.99".
2886  * Return descriptor to the file, set "name" to its name.
2887  *
2888  * Generates failure reply on error.
2889  */
2890 static int
2891 guniquefd(local, name)
2892         char *local;
2893         char **name;
2894 {
2895         static char new[MAXPATHLEN];
2896         struct stat st;
2897         char *cp;
2898         int count;
2899         int fd;
2900
2901         cp = strrchr(local, '/');
2902         if (cp)
2903                 *cp = '\0';
2904         if (stat(cp ? local : ".", &st) < 0) {
2905                 perror_reply(553, cp ? local : ".");
2906                 return (-1);
2907         }
2908         if (cp) {
2909                 /*
2910                  * Let not overwrite dirname with counter suffix.
2911                  * -4 is for /nn\0
2912                  * In this extreme case dot won't be put in front of suffix.
2913                  */
2914                 if (strlen(local) > sizeof(new) - 4) {
2915                         reply(553, "Pathname too long");
2916                         return (-1);
2917                 }
2918                 *cp = '/';
2919         }
2920         /* -4 is for the .nn<null> we put on the end below */
2921         (void) snprintf(new, sizeof(new) - 4, "%s", local);
2922         cp = new + strlen(new);
2923         /*
2924          * Don't generate dotfile unless requested explicitly.
2925          * This covers the case when basename gets truncated off
2926          * by buffer size.
2927          */
2928         if (cp > new && cp[-1] != '/')
2929                 *cp++ = '.';
2930         for (count = 0; count < 100; count++) {
2931                 /* At count 0 try unmodified name */
2932                 if (count)
2933                         (void)sprintf(cp, "%d", count);
2934                 if ((fd = open(count ? new : local,
2935                     O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) {
2936                         *name = count ? new : local;
2937                         return (fd);
2938                 }
2939                 if (errno != EEXIST) {
2940                         perror_reply(553, count ? new : local);
2941                         return (-1);
2942                 }
2943         }
2944         reply(452, "Unique file name cannot be created.");
2945         return (-1);
2946 }
2947
2948 /*
2949  * Format and send reply containing system error number.
2950  */
2951 void
2952 perror_reply(code, string)
2953         int code;
2954         char *string;
2955 {
2956
2957         reply(code, "%s: %s.", string, strerror(errno));
2958 }
2959
2960 static char *onefile[] = {
2961         "",
2962         0
2963 };
2964
2965 void
2966 send_file_list(whichf)
2967         char *whichf;
2968 {
2969         struct stat st;
2970         DIR *dirp = NULL;
2971         struct dirent *dir;
2972         FILE *dout = NULL;
2973         char **dirlist, *dirname;
2974         int simple = 0;
2975         int freeglob = 0;
2976         glob_t gl;
2977
2978         if (strpbrk(whichf, "~{[*?") != NULL) {
2979                 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE;
2980
2981                 memset(&gl, 0, sizeof(gl));
2982                 gl.gl_matchc = MAXGLOBARGS;
2983                 flags |= GLOB_LIMIT;
2984                 freeglob = 1;
2985                 if (glob(whichf, flags, 0, &gl)) {
2986                         reply(550, "not found");
2987                         goto out;
2988                 } else if (gl.gl_pathc == 0) {
2989                         errno = ENOENT;
2990                         perror_reply(550, whichf);
2991                         goto out;
2992                 }
2993                 dirlist = gl.gl_pathv;
2994         } else {
2995                 onefile[0] = whichf;
2996                 dirlist = onefile;
2997                 simple = 1;
2998         }
2999
3000         while ((dirname = *dirlist++)) {
3001                 if (stat(dirname, &st) < 0) {
3002                         /*
3003                          * If user typed "ls -l", etc, and the client
3004                          * used NLST, do what the user meant.
3005                          */
3006                         if (dirname[0] == '-' && *dirlist == NULL &&
3007                             transflag == 0) {
3008                                 retrieve(_PATH_LS " %s", dirname);
3009                                 goto out;
3010                         }
3011                         perror_reply(550, whichf);
3012                         if (dout != NULL) {
3013                                 (void) fclose(dout);
3014                                 transflag = 0;
3015                                 data = -1;
3016                                 pdata = -1;
3017                         }
3018                         goto out;
3019                 }
3020
3021                 if (S_ISREG(st.st_mode)) {
3022                         if (dout == NULL) {
3023                                 dout = dataconn("file list", (off_t)-1, "w");
3024                                 if (dout == NULL)
3025                                         goto out;
3026                                 transflag++;
3027                         }
3028                         fprintf(dout, "%s%s\n", dirname,
3029                                 type == TYPE_A ? "\r" : "");
3030                         byte_count += strlen(dirname) + 1;
3031                         continue;
3032                 } else if (!S_ISDIR(st.st_mode))
3033                         continue;
3034
3035                 if ((dirp = opendir(dirname)) == NULL)
3036                         continue;
3037
3038                 while ((dir = readdir(dirp)) != NULL) {
3039                         char nbuf[MAXPATHLEN];
3040
3041                         if (recvurg) {
3042                                 myoob();
3043                                 recvurg = 0;
3044                                 transflag = 0;
3045                                 goto out;
3046                         }
3047
3048                         if (strcmp(dir->d_name, ".") == 0)
3049                                 continue;
3050                         if (strcmp(dir->d_name, "..") == 0)
3051                                 continue;
3052
3053                         snprintf(nbuf, sizeof(nbuf),
3054                                 "%s/%s", dirname, dir->d_name);
3055
3056                         /*
3057                          * We have to do a stat to insure it's
3058                          * not a directory or special file.
3059                          */
3060                         if (simple || (stat(nbuf, &st) == 0 &&
3061                             S_ISREG(st.st_mode))) {
3062                                 if (dout == NULL) {
3063                                         dout = dataconn("file list", (off_t)-1,
3064                                                 "w");
3065                                         if (dout == NULL)
3066                                                 goto out;
3067                                         transflag++;
3068                                 }
3069                                 if (nbuf[0] == '.' && nbuf[1] == '/')
3070                                         fprintf(dout, "%s%s\n", &nbuf[2],
3071                                                 type == TYPE_A ? "\r" : "");
3072                                 else
3073                                         fprintf(dout, "%s%s\n", nbuf,
3074                                                 type == TYPE_A ? "\r" : "");
3075                                 byte_count += strlen(nbuf) + 1;
3076                         }
3077                 }
3078                 (void) closedir(dirp);
3079         }
3080
3081         if (dout == NULL)
3082                 reply(550, "No files found.");
3083         else if (ferror(dout) != 0)
3084                 perror_reply(550, "Data connection");
3085         else
3086                 reply(226, "Transfer complete.");
3087
3088         transflag = 0;
3089         if (dout != NULL)
3090                 (void) fclose(dout);
3091         data = -1;
3092         pdata = -1;
3093 out:
3094         if (freeglob) {
3095                 freeglob = 0;
3096                 globfree(&gl);
3097         }
3098 }
3099
3100 void
3101 reapchild(signo)
3102         int signo;
3103 {
3104         while (wait3(NULL, WNOHANG, NULL) > 0);
3105 }
3106
3107 #ifdef OLD_SETPROCTITLE
3108 /*
3109  * Clobber argv so ps will show what we're doing.  (Stolen from sendmail.)
3110  * Warning, since this is usually started from inetd.conf, it often doesn't
3111  * have much of an environment or arglist to overwrite.
3112  */
3113 void
3114 #if __STDC__
3115 setproctitle(const char *fmt, ...)
3116 #else
3117 setproctitle(fmt, va_alist)
3118         char *fmt;
3119         va_dcl
3120 #endif
3121 {
3122         int i;
3123         va_list ap;
3124         char *p, *bp, ch;
3125         char buf[LINE_MAX];
3126
3127 #if __STDC__
3128         va_start(ap, fmt);
3129 #else
3130         va_start(ap);
3131 #endif
3132         (void)vsnprintf(buf, sizeof(buf), fmt, ap);
3133
3134         /* make ps print our process name */
3135         p = Argv[0];
3136         *p++ = '-';
3137
3138         i = strlen(buf);
3139         if (i > LastArgv - p - 2) {
3140                 i = LastArgv - p - 2;
3141                 buf[i] = '\0';
3142         }
3143         bp = buf;
3144         while (ch = *bp++)
3145                 if (ch != '\n' && ch != '\r')
3146                         *p++ = ch;
3147         while (p < LastArgv)
3148                 *p++ = ' ';
3149 }
3150 #endif /* OLD_SETPROCTITLE */
3151
3152 static void
3153 logxfer(name, size, start)
3154         char *name;
3155         off_t size;
3156         time_t start;
3157 {
3158         char buf[1024];
3159         char path[MAXPATHLEN + 1];
3160         time_t now;
3161
3162         if (statfd >= 0 && getwd(path) != NULL) {
3163                 time(&now);
3164                 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n",
3165                         ctime(&now)+4, ident, remotehost,
3166                         path, name, (long long)size,
3167                         (long)(now - start + (now == start)));
3168                 write(statfd, buf, strlen(buf));
3169         }
3170 }
3171
3172 static char *
3173 doublequote(s)
3174         char *s;
3175 {
3176         int n;
3177         char *p, *s2;
3178
3179         for (p = s, n = 0; *p; p++)
3180                 if (*p == '"')
3181                         n++;
3182
3183         if ((s2 = malloc(p - s + n + 1)) == NULL)
3184                 return (NULL);
3185
3186         for (p = s2; *s; s++, p++) {
3187                 if ((*p = *s) == '"')
3188                         *(++p) = '"';
3189         }
3190         *p = '\0';
3191
3192         return (s2);
3193 }