usr.bin/ftp/ftp.c

   1 /* $FreeBSD: src/usr.bin/ftp/ftp.c,v 1.28.2.5 2002/07/25 15:29:18 ume Exp $     */
   2 /* $DragonFly: src/usr.bin/ftp/Attic/ftp.c,v 1.5 2004/01/22 19:39:13 dillon Exp $       */
   3 /*      $NetBSD: ftp.c,v 1.29.2.1 1997/11/18 01:01:04 mellon Exp $      */
   4
   5 /*
   6  * Copyright (c) 1985, 1989, 1993, 1994
   7  *      The Regents of the University of California.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  * @(#)ftp.c    8.6 (Berkeley) 10/27/94
  38  * $NetBSD: ftp.c,v 1.29.2.1 1997/11/18 01:01:04 mellon Exp $
  39  * $FreeBSD: src/usr.bin/ftp/ftp.c,v 1.28.2.5 2002/07/25 15:29:18 ume Exp $
  40  */
  41
  42 #include <sys/cdefs.h>
  43
  44 #include <sys/types.h>
  45 #include <sys/stat.h>
  46 #include <sys/socket.h>
  47 #include <sys/time.h>
  48
  49 #include <netinet/in.h>
  50 #include <netinet/in_systm.h>
  51 #include <netinet/ip.h>
  52 #include <arpa/inet.h>
  53 #include <arpa/ftp.h>
  54 #include <arpa/telnet.h>
  55
  56 #include <ctype.h>
  57 #include <err.h>
  58 #include <errno.h>
  59 #include <netdb.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64 #ifdef __STDC__
  65 #include <stdarg.h>
  66 #else
  67 #include <varargs.h>
  68 #endif
  69
  70 #include "ftp_var.h"
  71
  72 int     data = -1;
  73 int     abrtflag = 0;
  74 jmp_buf ptabort;
  75 int     ptabflg;
  76 int     ptflag = 0;
  77
  78 FILE    *cin, *cout;
  79
  80 union sockunion {
  81         struct sockinet {
  82                 u_char si_len;
  83                 u_char si_family;
  84                 u_short si_port;
  85         } su_si;
  86         struct sockaddr_in  su_sin;
  87         struct sockaddr_in6 su_sin6;
  88 };
  89 #define su_len          su_si.si_len
  90 #define su_family       su_si.si_family
  91 #define su_port         su_si.si_port
  92
  93 union sockunion myctladdr, hisctladdr, data_addr;
  94
  95 char *
  96 hookup(const char *host0, char *port)
  97 {
  98         int s, len, tos, error;
  99         struct addrinfo hints, *res, *res0;
 100         static char hostnamebuf[MAXHOSTNAMELEN];
 101         char *host;
 102
 103         if (*host0 == '[' && strrchr(host0, ']') != NULL) { /*IPv6 addr in []*/
 104                 strncpy(hostnamebuf, host0 + 1, strlen(host0) - 2);
 105                 hostnamebuf[strlen(host0) - 2] = '\0';
 106         } else {
 107                 strncpy(hostnamebuf, host0, strlen(host0));
 108                 hostnamebuf[strlen(host0)] = '\0';
 109         }
 110         host = hostnamebuf;
 111         memset(&hints, 0, sizeof(hints));
 112         hints.ai_flags = AI_CANONNAME;
 113         hints.ai_family = family;
 114         hints.ai_socktype = SOCK_STREAM;
 115         hints.ai_protocol = 0;
 116         error = getaddrinfo(host, port, &hints, &res0);
 117         if (error) {
 118                 warnx("%s: %s", host, gai_strerror(error));
 119                 if (error == EAI_SYSTEM)
 120                         warnx("%s: %s", host, strerror(errno));
 121                 code = -1;
 122                 return (0);
 123         }
 124
 125         res = res0;
 126         if (res->ai_canonname)
 127                 (void) strncpy(hostnamebuf, res->ai_canonname,
 128                                sizeof(hostnamebuf));
 129         hostname = hostnamebuf;
 130         while (1) {
 131                 /*
 132                  * make sure that ai_addr is NOT an IPv4 mapped address.
 133                  * IPv4 mapped address complicates too many things in FTP
 134                  * protocol handling, as FTP protocol is defined differently
 135                  * between IPv4 and IPv6.
 136                  */
 137                 ai_unmapped(res);
 138                 s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
 139                 if (s < 0) {
 140                         res = res->ai_next;
 141                         if (res)
 142                                 continue;
 143                         warn("socket");
 144                         code = -1;
 145                         return (0);
 146                 }
 147                 if (dobind) {
 148                         struct addrinfo *bindres;
 149                         int binderr = -1;
 150
 151                         for (bindres = bindres0;
 152                              bindres != NULL;
 153                              bindres = bindres->ai_next)
 154                                 if (bindres->ai_family == res->ai_family)
 155                                         break;
 156                         if (bindres == NULL)
 157                                 bindres = bindres0;
 158                         binderr = bind(s, bindres->ai_addr,
 159                                        bindres->ai_addrlen);
 160                         if (binderr == -1)
 161                       {
 162                         res = res->ai_next;
 163                         if (res) {
 164                                 (void)close(s);
 165                                 continue;
 166                         }
 167                         warn("bind");
 168                         code = -1;
 169                         goto bad;
 170                       }
 171                 }
 172                 if (connect(s, res->ai_addr, res->ai_addrlen) == 0)
 173                         break;
 174                 if (res->ai_next) {
 175                         char hname[NI_MAXHOST];
 176                         getnameinfo(res->ai_addr, res->ai_addrlen,
 177                                     hname, sizeof(hname) - 1, NULL, 0,
 178                                     NI_NUMERICHOST);
 179                         warn("connect to address %s", hname);
 180                         res = res->ai_next;
 181                         getnameinfo(res->ai_addr, res->ai_addrlen,
 182                                     hname, sizeof(hname) - 1, NULL, 0,
 183                                     NI_NUMERICHOST);
 184                         printf("Trying %s...\n", hname);
 185                         (void)close(s);
 186                         continue;
 187                 }
 188                 warn("connect");
 189                 code = -1;
 190                 goto bad;
 191         }
 192         memcpy(&hisctladdr, res->ai_addr, res->ai_addrlen);
 193         freeaddrinfo(res0);
 194         len = sizeof(myctladdr);
 195         if (getsockname(s, (struct sockaddr *)&myctladdr, &len) < 0) {
 196                 warn("getsockname");
 197                 code = -1;
 198                 goto bad;
 199         }
 200 #ifdef IP_TOS
 201         if (myctladdr.su_family == AF_INET)
 202       {
 203              tos = IPTOS_LOWDELAY;
 204         if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
 205                 warn("setsockopt TOS (ignored)");
 206       }
 207 #endif
 208         cin = fdopen(s, "r");
 209         cout = fdopen(s, "w");
 210         if (cin == NULL || cout == NULL) {
 211                 warnx("fdopen failed.");
 212                 if (cin)
 213                         (void)fclose(cin);
 214                 if (cout)
 215                         (void)fclose(cout);
 216                 code = -1;
 217                 goto bad;
 218         }
 219         if (verbose)
 220                 printf("Connected to %s.\n", hostname);
 221         if (getreply(0) > 2) {  /* read startup message from server */
 222                 if (cin)
 223                         (void)fclose(cin);
 224                 if (cout)
 225                         (void)fclose(cout);
 226                 code = -1;
 227                 goto bad;
 228         }
 229 #ifdef SO_OOBINLINE
 230         {
 231         int on = 1;
 232
 233         if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on))
 234                 < 0 && debug) {
 235                         warn("setsockopt");
 236                 }
 237         }
 238 #endif /* SO_OOBINLINE */
 239
 240         return (hostname);
 241 bad:
 242         (void)close(s);
 243         return ((char *)0);
 244 }
 245
 246 void
 247 cmdabort(int notused)
 248 {
 249
 250         alarmtimer(0);
 251         putchar('\n');
 252         (void)fflush(stdout);
 253         abrtflag++;
 254         if (ptflag)
 255                 longjmp(ptabort, 1);
 256 }
 257
 258 /*VARARGS*/
 259 int
 260 command(const char *fmt, ...)
 261 {
 262         va_list ap;
 263         int r;
 264         sig_t oldintr;
 265         abrtflag = 0;
 266         if (debug) {
 267                 fputs("---> ", stdout);
 268                 va_start(ap, fmt);
 269                 if (strncmp("PASS ", fmt, 5) == 0)
 270                         fputs("PASS XXXX", stdout);
 271                 else if (strncmp("ACCT ", fmt, 5) == 0)
 272                         fputs("ACCT XXXX", stdout);
 273                 else
 274                         vprintf(fmt, ap);
 275                 va_end(ap);
 276                 putchar('\n');
 277                 (void)fflush(stdout);
 278         }
 279         if (cout == NULL) {
 280                 warnx("No control connection for command.");
 281                 code = -1;
 282                 return (0);
 283         }
 284         oldintr = signal(SIGINT, cmdabort);
 285         va_start(ap, fmt);
 286         vfprintf(cout, fmt, ap);
 287         va_end(ap);
 288         fputs("\r\n", cout);
 289         (void)fflush(cout);
 290         cpend = 1;
 291         r = getreply(!strcmp(fmt, "QUIT"));
 292         if (abrtflag && oldintr != SIG_IGN)
 293                 (*oldintr)(SIGINT);
 294         (void)signal(SIGINT, oldintr);
 295         return (r);
 296 }
 297
 298 char reply_string[BUFSIZ];              /* first line of previous reply */
 299
 300 int
 301 getreply(int expecteof)
 302 {
 303         char current_line[BUFSIZ];      /* last line of previous reply */
 304         int c, n, line;
 305         int dig;
 306         int originalcode = 0, continuation = 0;
 307         sig_t oldintr;
 308         int pflag = 0;
 309         char *cp, *pt = pasv;
 310
 311         oldintr = signal(SIGINT, cmdabort);
 312         for (line = 0 ;; line++) {
 313                 dig = n = code = 0;
 314                 cp = current_line;
 315                 while ((c = getc(cin)) != '\n') {
 316                         if (c == IAC) {     /* handle telnet commands */
 317                                 switch (c = getc(cin)) {
 318                                 case WILL:
 319                                 case WONT:
 320                                         c = getc(cin);
 321                                         fprintf(cout, "%c%c%c", IAC, DONT, c);
 322                                         (void)fflush(cout);
 323                                         break;
 324                                 case DO:
 325                                 case DONT:
 326                                         c = getc(cin);
 327                                         fprintf(cout, "%c%c%c", IAC, WONT, c);
 328                                         (void)fflush(cout);
 329                                         break;
 330                                 default:
 331                                         break;
 332                                 }
 333                                 continue;
 334                         }
 335                         dig++;
 336                         if (c == EOF) {
 337                                 if (expecteof) {
 338                                         (void)signal(SIGINT, oldintr);
 339                                         code = 221;
 340                                         return (0);
 341                                 }
 342                                 lostpeer();
 343                                 if (verbose) {
 344                                         puts(
 345 "421 Service not available, remote server has closed connection.");
 346                                         (void)fflush(stdout);
 347                                 }
 348                                 code = 421;
 349                                 return (4);
 350                         }
 351                         if (c != '\r' && (verbose > 0 ||
 352                             (verbose > -1 && n == '5' && dig > 4))) {
 353                                 if (proxflag &&
 354                                    (dig == 1 || (dig == 5 && verbose == 0)))
 355                                         printf("%s:", hostname);
 356                                 (void)putchar(c);
 357                         }
 358                         if (dig < 4 && isdigit((unsigned char)c))
 359                                 code = code * 10 + (c - '0');
 360                         switch (pflag) {
 361                         case 0:
 362                                 if (code == 227 || code == 228) {
 363                                         /* result for PASV/LPSV */
 364                                         pflag = 1;
 365                                         /* fall through */
 366                                 } else if (code == 229) {
 367                                         /* result for EPSV */
 368                                         pflag = 100;
 369                                         break;
 370                                 } else
 371                                         break;
 372                         case 1:
 373                                 if (!(dig > 4 && isdigit((unsigned char)c)))
 374                                         break;
 375                                 pflag = 2;
 376                                 /* fall through */
 377                         case 2:
 378                                 if (c != '\r' && c != ')' &&
 379                                     pt < &pasv[sizeof(pasv)-1])
 380                                         *pt++ = c;
 381                                 else {
 382                                         *pt = '\0';
 383                                         pflag = 3;
 384                                 }
 385                                 break;
 386                         case 100:
 387                                 if (dig > 4 && c == '(')
 388                                         pflag = 2;
 389                                 break;
 390                         }
 391                         if (dig == 4 && c == '-') {
 392                                 if (continuation)
 393                                         code = 0;
 394                                 continuation++;
 395                         }
 396                         if (n == 0)
 397                                 n = c;
 398                         if (cp < &current_line[sizeof(current_line) - 1])
 399                                 *cp++ = c;
 400                 }
 401                 if (verbose > 0 || (verbose > -1 && n == '5')) {
 402                         (void)putchar(c);
 403                         (void)fflush (stdout);
 404                 }
 405                 if (line == 0) {
 406                         size_t len = cp - current_line;
 407
 408                         if (len > sizeof(reply_string))
 409                                 len = sizeof(reply_string);
 410
 411                         (void)strncpy(reply_string, current_line, len);
 412                         reply_string[len] = '\0';
 413                 }
 414                 if (continuation && code != originalcode) {
 415                         if (originalcode == 0)
 416                                 originalcode = code;
 417                         continue;
 418                 }
 419                 *cp = '\0';
 420                 if (n != '1')
 421                         cpend = 0;
 422                 (void)signal(SIGINT, oldintr);
 423                 if (code == 421 || originalcode == 421)
 424                         lostpeer();
 425                 if (abrtflag && oldintr != cmdabort && oldintr != SIG_IGN)
 426                         (*oldintr)(SIGINT);
 427                 return (n - '0');
 428         }
 429 }
 430
 431 int
 432 empty(fd_set *mask, int sec)
 433 {
 434         struct timeval t;
 435
 436         t.tv_sec = (long) sec;
 437         t.tv_usec = 0;
 438         return (select(32, mask, (fd_set *) 0, (fd_set *) 0, &t));
 439 }
 440
 441 jmp_buf sendabort;
 442
 443 void
 444 abortsend(int notused)
 445 {
 446
 447         alarmtimer(0);
 448         mflag = 0;
 449         abrtflag = 0;
 450         puts("\nsend aborted\nwaiting for remote to finish abort.");
 451         (void)fflush(stdout);
 452         longjmp(sendabort, 1);
 453 }
 454
 455 void
 456 sendrequest(const char *cmd, const char *local, const char *remote,
 457             int printnames)
 458 {
 459         struct stat st;
 460         int c, d;
 461         FILE *fin, *dout;
 462         int (*closefunc)(FILE *);
 463         sig_t oldinti, oldintr, oldintp;
 464         volatile off_t hashbytes;
 465         char *lmode, *bufp;
 466         int oprogress;
 467         static size_t bufsize;
 468         static char *buf;
 469
 470 #ifdef __GNUC__                 /* XXX: to shut up gcc warnings */
 471         (void)&fin;
 472         (void)&dout;
 473         (void)&closefunc;
 474         (void)&oldinti;
 475         (void)&oldintr;
 476         (void)&oldintp;
 477         (void)&lmode;
 478 #endif
 479
 480         hashbytes = mark;
 481         direction = "sent";
 482         dout = NULL;
 483         bytes = 0;
 484         filesize = -1;
 485         oprogress = progress;
 486         if (verbose && printnames) {
 487                 if (local && *local != '-')
 488                         printf("local: %s ", local);
 489                 if (remote)
 490                         printf("remote: %s\n", remote);
 491         }
 492         if (proxy) {
 493                 proxtrans(cmd, local, remote);
 494                 return;
 495         }
 496         if (curtype != type)
 497                 changetype(type, 0);
 498         closefunc = NULL;
 499         oldintr = NULL;
 500         oldintp = NULL;
 501         oldinti = NULL;
 502         lmode = "w";
 503         if (setjmp(sendabort)) {
 504                 while (cpend) {
 505                         (void)getreply(0);
 506                 }
 507                 if (data >= 0) {
 508                         (void)close(data);
 509                         data = -1;
 510                 }
 511                 if (oldintr)
 512                         (void)signal(SIGINT, oldintr);
 513                 if (oldintp)
 514                         (void)signal(SIGPIPE, oldintp);
 515                 if (oldinti)
 516                         (void)signal(SIGINFO, oldinti);
 517                 code = -1;
 518                 goto cleanupsend;
 519         }
 520         oldintr = signal(SIGINT, abortsend);
 521         oldinti = signal(SIGINFO, psummary);
 522         if (strcmp(local, "-") == 0) {
 523                 fin = stdin;
 524                 progress = 0;
 525         } else if (*local == '|') {
 526                 oldintp = signal(SIGPIPE, SIG_IGN);
 527                 fin = popen(local + 1, "r");
 528                 if (fin == NULL) {
 529                         warn("%s", local + 1);
 530                         (void)signal(SIGINT, oldintr);
 531                         (void)signal(SIGPIPE, oldintp);
 532                         (void)signal(SIGINFO, oldinti);
 533                         code = -1;
 534                         goto cleanupsend;
 535                 }
 536                 progress = 0;
 537                 closefunc = pclose;
 538         } else {
 539                 fin = fopen(local, "r");
 540                 if (fin == NULL) {
 541                         warn("local: %s", local);
 542                         (void)signal(SIGINT, oldintr);
 543                         (void)signal(SIGINFO, oldinti);
 544                         code = -1;
 545                         goto cleanupsend;
 546                 }
 547                 closefunc = fclose;
 548                 if (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode)) {
 549                         printf("%s: not a plain file.\n", local);
 550                         (void)signal(SIGINT, oldintr);
 551                         (void)signal(SIGINFO, oldinti);
 552                         fclose(fin);
 553                         code = -1;
 554                         goto cleanupsend;
 555                 }
 556                 filesize = st.st_size;
 557         }
 558         if (initconn()) {
 559                 (void)signal(SIGINT, oldintr);
 560                 (void)signal(SIGINFO, oldinti);
 561                 if (oldintp)
 562                         (void)signal(SIGPIPE, oldintp);
 563                 code = -1;
 564                 if (closefunc != NULL)
 565                         (*closefunc)(fin);
 566                 goto cleanupsend;
 567         }
 568         if (fstat(fileno(fin), &st) < 0 || st.st_blksize < BUFSIZ)
 569                 st.st_blksize = BUFSIZ;
 570         if (st.st_blksize > bufsize) {
 571                 if (buf)
 572                         (void)free(buf);
 573                 buf = malloc((unsigned)st.st_blksize);
 574                 if (buf == NULL) {
 575                         warn("malloc");
 576                         bufsize = 0;
 577                         goto abort;
 578                 }
 579                 bufsize = st.st_blksize;
 580         }
 581         if (setjmp(sendabort))
 582                 goto abort;
 583
 584         if (restart_point &&
 585             (strcmp(cmd, "STOR") == 0 || strcmp(cmd, "APPE") == 0)) {
 586                 int rc;
 587
 588                 rc = -1;
 589                 switch (curtype) {
 590                 case TYPE_A:
 591                         rc = fseek(fin, (long) restart_point, SEEK_SET);
 592                         break;
 593                 case TYPE_I:
 594                 case TYPE_L:
 595                         rc = lseek(fileno(fin), restart_point, SEEK_SET);
 596                         break;
 597                 }
 598                 if (rc < 0) {
 599                         warn("local: %s", local);
 600                         if (closefunc != NULL)
 601                                 (*closefunc)(fin);
 602                         goto cleanupsend;
 603                 }
 604                 if (command("REST %qd", (long long) restart_point) !=
 605                     CONTINUE) {
 606                         if (closefunc != NULL)
 607                                 (*closefunc)(fin);
 608                         goto cleanupsend;
 609                 }
 610                 lmode = "r+w";
 611         }
 612         if (remote) {
 613                 if (command("%s %s", cmd, remote) != PRELIM) {
 614                         (void)signal(SIGINT, oldintr);
 615                         (void)signal(SIGINFO, oldinti);
 616                         if (oldintp)
 617                                 (void)signal(SIGPIPE, oldintp);
 618                         if (closefunc != NULL)
 619                                 (*closefunc)(fin);
 620                         goto cleanupsend;
 621                 }
 622         } else
 623                 if (command("%s", cmd) != PRELIM) {
 624                         (void)signal(SIGINT, oldintr);
 625                         (void)signal(SIGINFO, oldinti);
 626                         if (oldintp)
 627                                 (void)signal(SIGPIPE, oldintp);
 628                         if (closefunc != NULL)
 629                                 (*closefunc)(fin);
 630                         goto cleanupsend;
 631                 }
 632         dout = dataconn(lmode);
 633         if (dout == NULL)
 634                 goto abort;
 635         progressmeter(-1);
 636         oldintp = signal(SIGPIPE, SIG_IGN);
 637         switch (curtype) {
 638
 639         case TYPE_I:
 640         case TYPE_L:
 641                 errno = d = 0;
 642                 while ((c = read(fileno(fin), buf, bufsize)) > 0) {
 643                         bytes += c;
 644                         for (bufp = buf; c > 0; c -= d, bufp += d)
 645                                 if ((d = write(fileno(dout), bufp, c)) <= 0)
 646                                         break;
 647                         if (hash && (!progress || filesize < 0) ) {
 648                                 while (bytes >= hashbytes) {
 649                                         (void)putchar('#');
 650                                         hashbytes += mark;
 651                                 }
 652                                 (void)fflush(stdout);
 653                         }
 654                 }
 655                 if (hash && (!progress || filesize < 0) && bytes > 0) {
 656                         if (bytes < mark)
 657                                 (void)putchar('#');
 658                         (void)putchar('\n');
 659                         (void)fflush(stdout);
 660                 }
 661                 if (c < 0)
 662                         warn("local: %s", local);
 663                 if (d < 0) {
 664                         if (errno != EPIPE)
 665                                 warn("netout");
 666                         bytes = -1;
 667                 }
 668                 break;
 669
 670         case TYPE_A:
 671                 while ((c = getc(fin)) != EOF) {
 672                         if (c == '\n') {
 673                                 while (hash && (!progress || filesize < 0) &&
 674                                     (bytes >= hashbytes)) {
 675                                         (void)putchar('#');
 676                                         (void)fflush(stdout);
 677                                         hashbytes += mark;
 678                                 }
 679                                 if (ferror(dout))
 680                                         break;
 681                                 (void)putc('\r', dout);
 682                                 bytes++;
 683                         }
 684                         (void)putc(c, dout);
 685                         bytes++;
 686 #if 0   /* this violates RFC */
 687                         if (c == '\r') {
 688                                 (void)putc('\0', dout);
 689                                 bytes++;
 690                         }
 691 #endif
 692                 }
 693                 if (hash && (!progress || filesize < 0)) {
 694                         if (bytes < hashbytes)
 695                                 (void)putchar('#');
 696                         (void)putchar('\n');
 697                         (void)fflush(stdout);
 698                 }
 699                 if (ferror(fin))
 700                         warn("local: %s", local);
 701                 if (ferror(dout)) {
 702                         if (errno != EPIPE)
 703                                 warn("netout");
 704                         bytes = -1;
 705                 }
 706                 break;
 707         }
 708         progressmeter(1);
 709         if (closefunc != NULL)
 710                 (*closefunc)(fin);
 711         (void)fclose(dout);
 712         (void)getreply(0);
 713         (void)signal(SIGINT, oldintr);
 714         (void)signal(SIGINFO, oldinti);
 715         if (oldintp)
 716                 (void)signal(SIGPIPE, oldintp);
 717         if (bytes > 0)
 718                 ptransfer(0);
 719         goto cleanupsend;
 720 abort:
 721         (void)signal(SIGINT, oldintr);
 722         (void)signal(SIGINFO, oldinti);
 723         if (oldintp)
 724                 (void)signal(SIGPIPE, oldintp);
 725         if (!cpend) {
 726                 code = -1;
 727                 return;
 728         }
 729         if (data >= 0) {
 730                 (void)close(data);
 731                 data = -1;
 732         }
 733         if (dout)
 734                 (void)fclose(dout);
 735         (void)getreply(0);
 736         code = -1;
 737         if (closefunc != NULL && fin != NULL)
 738                 (*closefunc)(fin);
 739         if (bytes > 0)
 740                 ptransfer(0);
 741 cleanupsend:
 742         progress = oprogress;
 743         restart_point = 0;
 744 }
 745
 746 jmp_buf recvabort;
 747
 748 void
 749 abortrecv(int notused)
 750 {
 751
 752         alarmtimer(0);
 753         mflag = 0;
 754         abrtflag = 0;
 755         puts("\nreceive aborted\nwaiting for remote to finish abort.");
 756         (void)fflush(stdout);
 757         longjmp(recvabort, 1);
 758 }
 759
 760 void
 761 recvrequest(const char *cmd, const char *local, const char *remote,
 762             const char *lmode, int printnames, int ignorespecial)
 763 {
 764         FILE *fout, *din;
 765         int (*closefunc)(FILE *);
 766         sig_t oldinti, oldintr, oldintp;
 767         int c, d;
 768         volatile int is_retr, tcrflag, bare_lfs;
 769         static size_t bufsize;
 770         static char *buf;
 771         volatile off_t hashbytes;
 772         struct stat st;
 773         time_t mtime;
 774         struct timeval tval[2];
 775         int oprogress;
 776         int opreserve;
 777
 778 #ifdef __GNUC__                 /* XXX: to shut up gcc warnings */
 779         (void)&local;
 780         (void)&fout;
 781         (void)&din;
 782         (void)&closefunc;
 783         (void)&oldinti;
 784         (void)&oldintr;
 785         (void)&oldintp;
 786 #endif
 787
 788         fout = NULL;
 789         din = NULL;
 790         oldinti = NULL;
 791         hashbytes = mark;
 792         direction = "received";
 793         bytes = 0;
 794         bare_lfs = 0;
 795         filesize = -1;
 796         oprogress = progress;
 797         opreserve = preserve;
 798         is_retr = (strcmp(cmd, "RETR") == 0);
 799         if (is_retr && verbose && printnames) {
 800                 if (local && (ignorespecial || *local != '-'))
 801                         printf("local: %s ", local);
 802                 if (remote)
 803                         printf("remote: %s\n", remote);
 804         }
 805         if (proxy && is_retr) {
 806                 proxtrans(cmd, local, remote);
 807                 return;
 808         }
 809         closefunc = NULL;
 810         oldintr = NULL;
 811         oldintp = NULL;
 812         tcrflag = !crflag && is_retr;
 813         if (setjmp(recvabort)) {
 814                 while (cpend) {
 815                         (void)getreply(0);
 816                 }
 817                 if (data >= 0) {
 818                         (void)close(data);
 819                         data = -1;
 820                 }
 821                 if (oldintr)
 822                         (void)signal(SIGINT, oldintr);
 823                 if (oldinti)
 824                         (void)signal(SIGINFO, oldinti);
 825                 progress = oprogress;
 826                 preserve = opreserve;
 827                 code = -1;
 828                 return;
 829         }
 830         oldintr = signal(SIGINT, abortrecv);
 831         oldinti = signal(SIGINFO, psummary);
 832         if (ignorespecial || (strcmp(local, "-") && *local != '|')) {
 833                 if (access(local, W_OK) < 0) {
 834                         char *dir = strrchr(local, '/');
 835
 836                         if (errno != ENOENT && errno != EACCES) {
 837                                 warn("local: %s", local);
 838                                 (void)signal(SIGINT, oldintr);
 839                                 (void)signal(SIGINFO, oldinti);
 840                                 code = -1;
 841                                 return;
 842                         }
 843                         if (dir != NULL)
 844                                 *dir = 0;
 845                         d = access(dir == local ? "/" : dir ? local : ".", W_OK);
 846                         if (dir != NULL)
 847                                 *dir = '/';
 848                         if (d < 0) {
 849                                 warn("local: %s", local);
 850                                 (void)signal(SIGINT, oldintr);
 851                                 (void)signal(SIGINFO, oldinti);
 852                                 code = -1;
 853                                 return;
 854                         }
 855                         if (!runique && errno == EACCES &&
 856                             chmod(local, 0600) < 0) {
 857                                 warn("local: %s", local);
 858                                 (void)signal(SIGINT, oldintr);
 859                                 (void)signal(SIGINFO, oldinti);
 860                                 code = -1;
 861                                 return;
 862                         }
 863                         if (runique && errno == EACCES &&
 864                            (local = gunique(local)) == NULL) {
 865                                 (void)signal(SIGINT, oldintr);
 866                                 (void)signal(SIGINFO, oldinti);
 867                                 code = -1;
 868                                 return;
 869                         }
 870                 }
 871                 else if (runique && (local = gunique(local)) == NULL) {
 872                         (void)signal(SIGINT, oldintr);
 873                         (void)signal(SIGINFO, oldinti);
 874                         code = -1;
 875                         return;
 876                 }
 877         }
 878         if (!is_retr) {
 879                 if (curtype != TYPE_A)
 880                         changetype(TYPE_A, 0);
 881         } else {
 882                 if (curtype != type)
 883                         changetype(type, 0);
 884                 filesize = remotesize(remote, 0);
 885         }
 886         if (initconn()) {
 887                 (void)signal(SIGINT, oldintr);
 888                 (void)signal(SIGINFO, oldinti);
 889                 code = -1;
 890                 return;
 891         }
 892         if (setjmp(recvabort))
 893                 goto abort;
 894         if (is_retr && restart_point &&
 895             command("REST %qd", (long long) restart_point) != CONTINUE)
 896                 return;
 897         if (remote) {
 898                 if (command("%s %s", cmd, remote) != PRELIM) {
 899                         (void)signal(SIGINT, oldintr);
 900                         (void)signal(SIGINFO, oldinti);
 901                         return;
 902                 }
 903         } else {
 904                 if (command("%s", cmd) != PRELIM) {
 905                         (void)signal(SIGINT, oldintr);
 906                         (void)signal(SIGINFO, oldinti);
 907                         return;
 908                 }
 909         }
 910         din = dataconn("r");
 911         if (din == NULL)
 912                 goto abort;
 913         if (!ignorespecial && strcmp(local, "-") == 0) {
 914                 fout = stdout;
 915                 progress = 0;
 916                 preserve = 0;
 917         } else if (!ignorespecial && *local == '|') {
 918                 oldintp = signal(SIGPIPE, SIG_IGN);
 919                 fout = popen(local + 1, "w");
 920                 if (fout == NULL) {
 921                         warn("%s", local+1);
 922                         goto abort;
 923                 }
 924                 progress = 0;
 925                 preserve = 0;
 926                 closefunc = pclose;
 927         } else {
 928                 fout = fopen(local, lmode);
 929                 if (fout == NULL) {
 930                         warn("local: %s", local);
 931                         goto abort;
 932                 }
 933                 closefunc = fclose;
 934         }
 935         if (fstat(fileno(fout), &st) < 0 || st.st_blksize < BUFSIZ)
 936                 st.st_blksize = BUFSIZ;
 937         if (st.st_blksize > bufsize) {
 938                 if (buf)
 939                         (void)free(buf);
 940                 buf = malloc((unsigned)st.st_blksize);
 941                 if (buf == NULL) {
 942                         warn("malloc");
 943                         bufsize = 0;
 944                         goto abort;
 945                 }
 946                 bufsize = st.st_blksize;
 947         }
 948         if (!S_ISREG(st.st_mode)) {
 949                 progress = 0;
 950                 preserve = 0;
 951         }
 952         progressmeter(-1);
 953         switch (curtype) {
 954
 955         case TYPE_I:
 956         case TYPE_L:
 957                 if (is_retr && restart_point &&
 958                     lseek(fileno(fout), restart_point, SEEK_SET) < 0) {
 959                         warn("local: %s", local);
 960                         progress = oprogress;
 961                         preserve = opreserve;
 962                         if (closefunc != NULL)
 963                                 (*closefunc)(fout);
 964                         return;
 965                 }
 966                 errno = d = 0;
 967                 while ((c = read(fileno(din), buf, bufsize)) > 0) {
 968                         if ((d = write(fileno(fout), buf, c)) != c)
 969                                 break;
 970                         bytes += c;
 971                         if (hash && (!progress || filesize < 0)) {
 972                                 while (bytes >= hashbytes) {
 973                                         (void)putchar('#');
 974                                         hashbytes += mark;
 975                                 }
 976                                 (void)fflush(stdout);
 977                         }
 978                 }
 979                 if (hash && (!progress || filesize < 0) && bytes > 0) {
 980                         if (bytes < mark)
 981                                 (void)putchar('#');
 982                         (void)putchar('\n');
 983                         (void)fflush(stdout);
 984                 }
 985                 if (c < 0) {
 986                         if (errno != EPIPE)
 987                                 warn("netin");
 988                         bytes = -1;
 989                 }
 990                 if (d < c) {
 991                         if (d < 0)
 992                                 warn("local: %s", local);
 993                         else
 994                                 warnx("%s: short write", local);
 995                 }
 996                 break;
 997
 998         case TYPE_A:
 999                 if (is_retr && restart_point) {
1000                         int ch;
1001                         long i, n;
1002
1003                         if (fseek(fout, 0L, SEEK_SET) < 0)
1004                                 goto done;
1005                         n = (long)restart_point;
1006                         for (i = 0; i++ < n;) {
1007                                 if ((ch = getc(fout)) == EOF)
1008                                         goto done;
1009                                 if (ch == '\n')
1010                                         i++;
1011                         }
1012                         if (fseek(fout, 0L, SEEK_CUR) < 0) {
1013 done:
1014                                 warn("local: %s", local);
1015                                 progress = oprogress;
1016                                 preserve = opreserve;
1017                                 if (closefunc != NULL)
1018                                         (*closefunc)(fout);
1019                                 return;
1020                         }
1021                 }
1022                 while ((c = getc(din)) != EOF) {
1023                         if (c == '\n')
1024                                 bare_lfs++;
1025                         while (c == '\r') {
1026                                 while (hash && (!progress || filesize < 0) &&
1027                                     (bytes >= hashbytes)) {
1028                                         (void)putchar('#');
1029                                         (void)fflush(stdout);
1030                                         hashbytes += mark;
1031                                 }
1032                                 bytes++;
1033                                 if ((c = getc(din)) != '\n' || tcrflag) {
1034                                         if (ferror(fout))
1035                                                 goto break2;
1036                                         (void)putc('\r', fout);
1037                                         if (c == '\0') {
1038                                                 bytes++;
1039                                                 goto contin2;
1040                                         }
1041                                         if (c == EOF)
1042                                                 goto contin2;
1043                                 }
1044                         }
1045                         (void)putc(c, fout);
1046                         bytes++;
1047         contin2:        ;
1048                 }
1049 break2:
1050                 if (bare_lfs) {
1051                         printf(
1052 "WARNING! %d bare linefeeds received in ASCII mode.\n", bare_lfs);
1053                         puts("File may not have transferred correctly.");
1054                 }
1055                 if (hash && (!progress || filesize < 0)) {
1056                         if (bytes < hashbytes)
1057                                 (void)putchar('#');
1058                         (void)putchar('\n');
1059                         (void)fflush(stdout);
1060                 }
1061                 if (ferror(din)) {
1062                         if (errno != EPIPE)
1063                                 warn("netin");
1064                         bytes = -1;
1065                 }
1066                 if (ferror(fout))
1067                         warn("local: %s", local);
1068                 break;
1069         }
1070         progressmeter(1);
1071         progress = oprogress;
1072         preserve = opreserve;
1073         if (closefunc != NULL)
1074                 (*closefunc)(fout);
1075         (void)signal(SIGINT, oldintr);
1076         (void)signal(SIGINFO, oldinti);
1077         if (oldintp)
1078                 (void)signal(SIGPIPE, oldintp);
1079         (void)fclose(din);
1080         (void)getreply(0);
1081         if (bytes >= 0 && is_retr) {
1082                 if (bytes > 0)
1083                         ptransfer(0);
1084                 if (preserve && (closefunc == fclose)) {
1085                         mtime = remotemodtime(remote, 0);
1086                         if (mtime != -1) {
1087                                 (void)gettimeofday(&tval[0],
1088                                     (struct timezone *)0);
1089                                 tval[1].tv_sec = mtime;
1090                                 tval[1].tv_usec = 0;
1091                                 if (utimes(local, tval) == -1) {
1092                                         printf(
1093                                 "Can't change modification time on %s to %s",
1094                                             local, asctime(localtime(&mtime)));
1095                                 }
1096                         }
1097                 }
1098         }
1099         return;
1100
1101 abort:
1102
1103 /* abort using RFC959 recommended IP,SYNC sequence */
1104
1105         progress = oprogress;
1106         preserve = opreserve;
1107         if (oldintp)
1108                 (void)signal(SIGPIPE, oldintp);
1109         (void)signal(SIGINT, SIG_IGN);
1110         if (!cpend) {
1111                 code = -1;
1112                 (void)signal(SIGINT, oldintr);
1113                 (void)signal(SIGINFO, oldinti);
1114                 return;
1115         }
1116
1117         abort_remote(din);
1118         code = -1;
1119         if (data >= 0) {
1120                 (void)close(data);
1121                 data = -1;
1122         }
1123         if (closefunc != NULL && fout != NULL)
1124                 (*closefunc)(fout);
1125         if (din)
1126                 (void)fclose(din);
1127         if (bytes > 0)
1128                 ptransfer(0);
1129         (void)signal(SIGINT, oldintr);
1130         (void)signal(SIGINFO, oldinti);
1131 }
1132
1133 /*
1134  * Need to start a listen on the data channel before we send the command,
1135  * otherwise the server's connect may fail.
1136  */
1137 int
1138 initconn(void)
1139 {
1140         char *p, *a;
1141         int result, len, tmpno = 0;
1142         int on = 1;
1143         int error, ports;
1144         u_int af;
1145         u_int hal, h[16];
1146         u_int pal, prt[2];
1147         char *pasvcmd;
1148
1149 #ifdef INET6
1150         if (myctladdr.su_family == AF_INET6
1151          && (IN6_IS_ADDR_LINKLOCAL(&myctladdr.su_sin6.sin6_addr)
1152           || IN6_IS_ADDR_SITELOCAL(&myctladdr.su_sin6.sin6_addr))) {
1153                 warnx("use of scoped address can be troublesome");
1154         }
1155 #endif
1156
1157         if (passivemode) {
1158 #ifdef __GNUC__                 /* XXX: to shut up gcc warnings */
1159                 (void)&pasvcmd;
1160 #endif
1161                 data_addr = myctladdr;
1162                 data = socket(data_addr.su_family, SOCK_STREAM, 0);
1163                 if (data < 0) {
1164                         warn("socket");
1165                         return (1);
1166                 }
1167                 if (dobind) {
1168                         struct addrinfo *bindres;
1169                         int binderr = -1;
1170
1171                         for (bindres = bindres0;
1172                              bindres != NULL;
1173                              bindres = bindres->ai_next)
1174                                 if (bindres->ai_family == data_addr.su_family)
1175                                         break;
1176                         if (bindres == NULL)
1177                                 bindres = bindres0;
1178                         binderr = bind(data, bindres->ai_addr,
1179                                        bindres->ai_addrlen);
1180                         if (binderr == -1)
1181                      {
1182                         warn("bind");
1183                         goto bad;
1184                      }
1185                 }
1186                 if ((options & SO_DEBUG) &&
1187                     setsockopt(data, SOL_SOCKET, SO_DEBUG, (char *)&on,
1188                                sizeof(on)) < 0)
1189                         warn("setsockopt (ignored)");
1190                 switch (data_addr.su_family) {
1191                 case AF_INET:
1192                         if (try_epsv) {
1193                                 int overbose;
1194
1195                                 overbose = verbose;
1196                                 if (debug == 0)
1197                                         verbose = -1;
1198                                 result = command(pasvcmd = "EPSV");
1199                                 verbose = overbose;
1200                                 if (code / 10 == 22 && code != 229) {
1201                                         puts("wrong server: EPSV return code must be 229");
1202                                         result = COMPLETE + 1;
1203                                 }
1204                         } else
1205                                 result = COMPLETE + 1;
1206                         if (result != COMPLETE) {
1207                                 try_epsv = 0;
1208                                 result = command(pasvcmd = "PASV");
1209                         }
1210                         break;
1211 #ifdef INET6
1212                 case AF_INET6:
1213                         result = command(pasvcmd = "EPSV");
1214                         if (code / 10 == 22 && code != 229) {
1215                                 puts("wrong server: EPSV return code must be 229");
1216                                 result = COMPLETE + 1;
1217                         }
1218                         if (result != COMPLETE)
1219                                 result = command(pasvcmd = "LPSV");
1220                         break;
1221 #endif
1222                 default:
1223                         result = COMPLETE + 1;
1224                 }
1225                 if (result != COMPLETE) {
1226                         puts("Passive mode refused.");
1227                         goto bad;
1228                 }
1229
1230 #define pack2(var, offset) \
1231         (((var[(offset) + 0] & 0xff) << 8) | ((var[(offset) + 1] & 0xff) << 0))
1232 #define pack4(var, offset) \
1233     (((var[(offset) + 0] & 0xff) << 24) | ((var[(offset) + 1] & 0xff) << 16) \
1234      | ((var[(offset) + 2] & 0xff) << 8) | ((var[(offset) + 3] & 0xff) << 0))
1235                 /*
1236                  * What we've got at this point is a string of comma
1237                  * separated one-byte unsigned integer values.
1238                  * In PASV case,
1239                  * The first four are the an IP address. The fifth is
1240                  * the MSB of the port number, the sixth is the LSB.
1241                  * From that we'll prepare a sockaddr_in.
1242                  * In other case, the format is more complicated.
1243                  */
1244                 if (strcmp(pasvcmd, "PASV") == 0) {
1245                         if (code / 10 == 22 && code != 227) {
1246                                 puts("wrong server: return code must be 227");
1247                                 error = 1;
1248                                 goto bad;
1249                         }
1250                         error = sscanf(pasv, "%d,%d,%d,%d,%d,%d",
1251                                &h[0], &h[1], &h[2], &h[3],
1252                                &prt[0], &prt[1]);
1253                         if (error == 6) {
1254                                 error = 0;
1255                                 data_addr.su_sin.sin_addr.s_addr =
1256                                         htonl(pack4(h, 0));
1257                         } else
1258                                 error = 1;
1259                 } else if (strcmp(pasvcmd, "LPSV") == 0) {
1260                         if (code / 10 == 22 && code != 228) {
1261                                 puts("wrong server: return code must be 228");
1262                                 error = 1;
1263                                 goto bad;
1264                         }
1265                         switch (data_addr.su_family) {
1266                         case AF_INET:
1267                                 error = sscanf(pasv,
1268 "%d,%d,%d,%d,%d,%d,%d,%d,%d",
1269                                        &af, &hal,
1270                                        &h[0], &h[1], &h[2], &h[3],
1271                                        &pal, &prt[0], &prt[1]);
1272                                 if (error == 9 && af == 4 && hal == 4 && pal == 2) {
1273                                         error = 0;
1274                                         data_addr.su_sin.sin_addr.s_addr =
1275                                                 htonl(pack4(h, 0));
1276                                 } else
1277                                         error = 1;
1278                                 break;
1279 #ifdef INET6
1280                         case AF_INET6:
1281                                 error = sscanf(pasv,
1282 "%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
1283                                                &af, &hal,
1284                                                &h[0], &h[1], &h[2], &h[3],
1285                                                &h[4], &h[5], &h[6], &h[7],
1286                                                &h[8], &h[9], &h[10], &h[11],
1287                                                &h[12], &h[13], &h[14], &h[15],
1288                                                &pal, &prt[0], &prt[1]);
1289                                 if (error != 21 || af != 6 || hal != 16 || pal != 2) {
1290                                         error = 1;
1291                                         break;
1292                                 }
1293
1294                                 error = 0;
1295                             {
1296                                 u_int32_t *p32;
1297                                 p32 = (u_int32_t *)&data_addr.su_sin6.sin6_addr;
1298                                 p32[0] = htonl(pack4(h, 0));
1299                                 p32[1] = htonl(pack4(h, 4));
1300                                 p32[2] = htonl(pack4(h, 8));
1301                                 p32[3] = htonl(pack4(h, 12));
1302                             }
1303                                 break;
1304 #endif
1305                         default:
1306                                 error = 1;
1307                         }
1308                 } else if (strcmp(pasvcmd, "EPSV") == 0) {
1309                         char delim[4];
1310
1311                         prt[0] = 0;
1312                         if (code / 10 == 22 && code != 229) {
1313                                 puts("wrong server: return code must be 229");
1314                                 error = 1;
1315                                 goto bad;
1316                         }
1317                         error = sscanf(pasv, "%c%c%c%d%c",
1318                                 &delim[0], &delim[1], &delim[2],
1319                                 &prt[1], &delim[3]);
1320                         if (error != 5) {
1321                                 error = 1;
1322                                 goto epsv_done;
1323                         }
1324                         if (delim[0] != delim[1] || delim[0] != delim[2]
1325                          || delim[0] != delim[3]) {
1326                                 error = 1;
1327                                 goto epsv_done;
1328                         }
1329
1330                         data_addr = hisctladdr;
1331                         /* quickhack */
1332                         prt[0] = (prt[1] & 0xff00) >> 8;
1333                         prt[1] &= 0xff;
1334                         error = 0;
1335 epsv_done:
1336                 } else
1337                         error = 1;
1338
1339                 if (error) {
1340                         puts(
1341 "Passive mode address scan failure. Shouldn't happen!");
1342                         goto bad;
1343                 };
1344
1345                 data_addr.su_port = htons(pack2(prt, 0));
1346
1347                 if (connect(data, (struct sockaddr *)&data_addr,
1348                             data_addr.su_len) < 0) {
1349                         warn("connect");
1350                         goto bad;
1351                 }
1352 #ifdef IP_TOS
1353                 if (data_addr.su_family == AF_INET)
1354               {
1355                 on = IPTOS_THROUGHPUT;
1356                 if (setsockopt(data, IPPROTO_IP, IP_TOS, (char *)&on,
1357                                sizeof(int)) < 0)
1358                         warn("setsockopt TOS (ignored)");
1359               }
1360 #endif
1361                 return (0);
1362         }
1363
1364 noport:
1365         data_addr = myctladdr;
1366         if (sendport)
1367                 data_addr.su_port = 0;  /* let system pick one */
1368         if (data != -1)
1369                 (void)close(data);
1370         data = socket(data_addr.su_family, SOCK_STREAM, 0);
1371         if (data < 0) {
1372                 warn("socket");
1373                 if (tmpno)
1374                         sendport = 1;
1375                 return (1);
1376         }
1377         if (!sendport)
1378                 if (setsockopt(data, SOL_SOCKET, SO_REUSEADDR, (char *)&on,
1379                                 sizeof(on)) < 0) {
1380                         warn("setsockopt (reuse address)");
1381                         goto bad;
1382                 }
1383 #ifdef IP_PORTRANGE
1384         if (data_addr.su_family == AF_INET)
1385       {
1386
1387         ports = restricted_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT;
1388         if (setsockopt(data, IPPROTO_IP, IP_PORTRANGE, (char *)&ports,
1389                        sizeof(ports)) < 0)
1390             warn("setsockopt PORTRANGE (ignored)");
1391       }
1392 #endif
1393 #ifdef INET6
1394 #ifdef IPV6_PORTRANGE
1395         if (data_addr.su_family == AF_INET6) {
1396                 ports = restricted_data_ports ? IPV6_PORTRANGE_HIGH
1397                         : IPV6_PORTRANGE_DEFAULT;
1398                 if (setsockopt(data, IPPROTO_IPV6, IPV6_PORTRANGE,
1399                                (char *)&ports, sizeof(ports)) < 0)
1400                   warn("setsockopt PORTRANGE (ignored)");
1401         }
1402 #endif
1403 #endif
1404         if (bind(data, (struct sockaddr *)&data_addr, data_addr.su_len) < 0) {
1405                 warn("bind");
1406                 goto bad;
1407         }
1408         if (options & SO_DEBUG &&
1409             setsockopt(data, SOL_SOCKET, SO_DEBUG, (char *)&on,
1410                         sizeof(on)) < 0)
1411                 warn("setsockopt (ignored)");
1412         len = sizeof(data_addr);
1413         if (getsockname(data, (struct sockaddr *)&data_addr, &len) < 0) {
1414                 warn("getsockname");
1415                 goto bad;
1416         }
1417         if (listen(data, 1) < 0)
1418                 warn("listen");
1419         if (sendport) {
1420                 char hname[INET6_ADDRSTRLEN];
1421                 int af;
1422                 struct sockaddr_in data_addr4;
1423                 union sockunion *daddr;
1424
1425 #ifdef INET6
1426                 if (data_addr.su_family == AF_INET6 &&
1427                     IN6_IS_ADDR_V4MAPPED(&data_addr.su_sin6.sin6_addr)) {
1428                         memset(&data_addr4, 0, sizeof(data_addr4));
1429                         data_addr4.sin_len = sizeof(struct sockaddr_in);
1430                         data_addr4.sin_family = AF_INET;
1431                         data_addr4.sin_port = data_addr.su_port;
1432                         memcpy((caddr_t)&data_addr4.sin_addr,
1433                                (caddr_t)&data_addr.su_sin6.sin6_addr.s6_addr[12],
1434                                sizeof(struct in_addr));
1435                         daddr = (union sockunion *)&data_addr4;
1436                 } else
1437 #endif
1438                 daddr = &data_addr;
1439
1440
1441
1442 #define UC(b)   (((int)b)&0xff)
1443
1444                 switch (daddr->su_family) {
1445 #ifdef INET6
1446                 case AF_INET6:
1447                         af = (daddr->su_family == AF_INET) ? 1 : 2;
1448                         if (daddr->su_family == AF_INET6)
1449                                 daddr->su_sin6.sin6_scope_id = 0;
1450                         if (getnameinfo((struct sockaddr *)daddr,
1451                                         daddr->su_len, hname,
1452                                         sizeof(hname) - 1, NULL, 0,
1453                                         NI_NUMERICHOST)) {
1454                                 result = ERROR;
1455                         } else {
1456                                 result = command("EPRT |%d|%s|%d|",
1457                                         af, hname, ntohs(daddr->su_port));
1458                         }
1459                         break;
1460 #endif
1461                 default:
1462                         result = COMPLETE + 1;
1463                         break;
1464                 }
1465                 if (result == COMPLETE)
1466                         goto skip_port;
1467
1468                 p = (char *)&daddr->su_port;
1469                 switch (daddr->su_family) {
1470                 case AF_INET:
1471                         a = (char *)&daddr->su_sin.sin_addr;
1472                         result = command("PORT %d,%d,%d,%d,%d,%d",
1473                                          UC(a[0]),UC(a[1]),UC(a[2]),UC(a[3]),
1474                                          UC(p[0]), UC(p[1]));
1475                         break;
1476 #ifdef INET6
1477                 case AF_INET6:
1478                         a = (char *)&daddr->su_sin6.sin6_addr;
1479                         result = command(
1480 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
1481                                          6, 16,
1482                                          UC(a[0]),UC(a[1]),UC(a[2]),UC(a[3]),
1483                                          UC(a[4]),UC(a[5]),UC(a[6]),UC(a[7]),
1484                                          UC(a[8]),UC(a[9]),UC(a[10]),UC(a[11]),
1485                                          UC(a[12]),UC(a[13]),UC(a[14]),UC(a[15]),
1486                                          2, UC(p[0]), UC(p[1]));
1487                         break;
1488 #endif
1489                 default:
1490                         result = COMPLETE + 1; /* xxx */
1491                 }
1492         skip_port:
1493
1494                 if (result == ERROR && sendport == -1) {
1495                         sendport = 0;
1496                         tmpno = 1;
1497                         goto noport;
1498                 }
1499                 return (result != COMPLETE);
1500         }
1501         if (tmpno)
1502                 sendport = 1;
1503 #ifdef IP_TOS
1504         if (data_addr.su_family == AF_INET)
1505       {
1506         on = IPTOS_THROUGHPUT;
1507         if (setsockopt(data, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
1508                 warn("setsockopt TOS (ignored)");
1509       }
1510 #endif
1511         return (0);
1512 bad:
1513         (void)close(data), data = -1;
1514         if (tmpno)
1515                 sendport = 1;
1516         return (1);
1517 }
1518
1519 FILE *
1520 dataconn(const char *lmode)
1521 {
1522         union sockunion from;
1523         int s, fromlen, tos;
1524
1525         fromlen = myctladdr.su_len;
1526
1527         if (passivemode)
1528                 return (fdopen(data, lmode));
1529
1530         s = accept(data, (struct sockaddr *) &from, &fromlen);
1531         if (s < 0) {
1532                 warn("accept");
1533                 (void)close(data), data = -1;
1534                 return (NULL);
1535         }
1536         (void)close(data);
1537         data = s;
1538 #ifdef IP_TOS
1539         if (data_addr.su_family == AF_INET)
1540       {
1541         tos = IPTOS_THROUGHPUT;
1542         if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
1543                 warn("setsockopt TOS (ignored)");
1544       }
1545 #endif
1546         return (fdopen(data, lmode));
1547 }
1548
1549 void
1550 psummary(int notused)
1551 {
1552
1553         if (bytes > 0)
1554                 ptransfer(1);
1555 }
1556
1557 void
1558 psabort(int notused)
1559 {
1560
1561         alarmtimer(0);
1562         abrtflag++;
1563 }
1564
1565 void
1566 pswitch(int flag)
1567 {
1568         sig_t oldintr;
1569         static struct comvars {
1570                 int connect;
1571                 char name[MAXHOSTNAMELEN];
1572                 union sockunion mctl;
1573                 union sockunion hctl;
1574                 FILE *in;
1575                 FILE *out;
1576                 int tpe;
1577                 int curtpe;
1578                 int cpnd;
1579                 int sunqe;
1580                 int runqe;
1581                 int mcse;
1582                 int ntflg;
1583                 char nti[17];
1584                 char nto[17];
1585                 int mapflg;
1586                 char mi[MAXPATHLEN];
1587                 char mo[MAXPATHLEN];
1588         } proxstruct, tmpstruct;
1589         struct comvars *ip, *op;
1590
1591         abrtflag = 0;
1592         oldintr = signal(SIGINT, psabort);
1593         if (flag) {
1594                 if (proxy)
1595                         return;
1596                 ip = &tmpstruct;
1597                 op = &proxstruct;
1598                 proxy++;
1599         } else {
1600                 if (!proxy)
1601                         return;
1602                 ip = &proxstruct;
1603                 op = &tmpstruct;
1604                 proxy = 0;
1605         }
1606         ip->connect = connected;
1607         connected = op->connect;
1608         if (hostname) {
1609                 (void)strncpy(ip->name, hostname, sizeof(ip->name) - 1);
1610                 ip->name[sizeof(ip->name) - 1] = '\0';
1611         } else
1612                 ip->name[0] = '\0';
1613         hostname = op->name;
1614         ip->hctl = hisctladdr;
1615         hisctladdr = op->hctl;
1616         ip->mctl = myctladdr;
1617         myctladdr = op->mctl;
1618         ip->in = cin;
1619         cin = op->in;
1620         ip->out = cout;
1621         cout = op->out;
1622         ip->tpe = type;
1623         type = op->tpe;
1624         ip->curtpe = curtype;
1625         curtype = op->curtpe;
1626         ip->cpnd = cpend;
1627         cpend = op->cpnd;
1628         ip->sunqe = sunique;
1629         sunique = op->sunqe;
1630         ip->runqe = runique;
1631         runique = op->runqe;
1632         ip->mcse = mcase;
1633         mcase = op->mcse;
1634         ip->ntflg = ntflag;
1635         ntflag = op->ntflg;
1636         (void)strncpy(ip->nti, ntin, sizeof(ip->nti) - 1);
1637         (ip->nti)[sizeof(ip->nti) - 1] = '\0';
1638         (void)strcpy(ntin, op->nti);
1639         (void)strncpy(ip->nto, ntout, sizeof(ip->nto) - 1);
1640         (ip->nto)[sizeof(ip->nto) - 1] = '\0';
1641         (void)strcpy(ntout, op->nto);
1642         ip->mapflg = mapflag;
1643         mapflag = op->mapflg;
1644         (void)strncpy(ip->mi, mapin, sizeof(ip->mi) - 1);
1645         (ip->mi)[sizeof(ip->mi) - 1] = '\0';
1646         (void)strcpy(mapin, op->mi);
1647         (void)strncpy(ip->mo, mapout, sizeof(ip->mo) - 1);
1648         (ip->mo)[sizeof(ip->mo) - 1] = '\0';
1649         (void)strcpy(mapout, op->mo);
1650         (void)signal(SIGINT, oldintr);
1651         if (abrtflag) {
1652                 abrtflag = 0;
1653                 (*oldintr)(SIGINT);
1654         }
1655 }
1656
1657 void
1658 abortpt(int notused)
1659 {
1660
1661         alarmtimer(0);
1662         putchar('\n');
1663         (void)fflush(stdout);
1664         ptabflg++;
1665         mflag = 0;
1666         abrtflag = 0;
1667         longjmp(ptabort, 1);
1668 }
1669
1670 void
1671 proxtrans(const char *cmd, const char *local, const char *remote)
1672 {
1673         sig_t oldintr;
1674         int prox_type, nfnd;
1675         volatile int secndflag;
1676         char *cmd2;
1677         fd_set mask;
1678
1679 #ifdef __GNUC__                 /* XXX: to shut up gcc warnings */
1680         (void)&oldintr;
1681         (void)&cmd2;
1682 #endif
1683
1684         oldintr = NULL;
1685         secndflag = 0;
1686         if (strcmp(cmd, "RETR"))
1687                 cmd2 = "RETR";
1688         else
1689                 cmd2 = runique ? "STOU" : "STOR";
1690         if ((prox_type = type) == 0) {
1691                 if (unix_server && unix_proxy)
1692                         prox_type = TYPE_I;
1693                 else
1694                         prox_type = TYPE_A;
1695         }
1696         if (curtype != prox_type)
1697                 changetype(prox_type, 1);
1698         if (try_epsv && command("EPSV") != COMPLETE)
1699                 try_epsv = 0;
1700         if (!try_epsv && command("PASV") != COMPLETE) {
1701                 puts("proxy server does not support third party transfers.");
1702                 return;
1703         }
1704         pswitch(0);
1705         if (!connected) {
1706                 puts("No primary connection.");
1707                 pswitch(1);
1708                 code = -1;
1709                 return;
1710         }
1711         if (curtype != prox_type)
1712                 changetype(prox_type, 1);
1713         if (command("PORT %s", pasv) != COMPLETE) {
1714                 pswitch(1);
1715                 return;
1716         }
1717         if (setjmp(ptabort))
1718                 goto abort;
1719         oldintr = signal(SIGINT, abortpt);
1720         if (command("%s %s", cmd, remote) != PRELIM) {
1721                 (void)signal(SIGINT, oldintr);
1722                 pswitch(1);
1723                 return;
1724         }
1725         sleep(2);
1726         pswitch(1);
1727         secndflag++;
1728         if (command("%s %s", cmd2, local) != PRELIM)
1729                 goto abort;
1730         ptflag++;
1731         (void)getreply(0);
1732         pswitch(0);
1733         (void)getreply(0);
1734         (void)signal(SIGINT, oldintr);
1735         pswitch(1);
1736         ptflag = 0;
1737         printf("local: %s remote: %s\n", local, remote);
1738         return;
1739 abort:
1740         (void)signal(SIGINT, SIG_IGN);
1741         ptflag = 0;
1742         if (strcmp(cmd, "RETR") && !proxy)
1743                 pswitch(1);
1744         else if (!strcmp(cmd, "RETR") && proxy)
1745                 pswitch(0);
1746         if (!cpend && !secndflag) {  /* only here if cmd = "STOR" (proxy=1) */
1747                 if (command("%s %s", cmd2, local) != PRELIM) {
1748                         pswitch(0);
1749                         if (cpend)
1750                                 abort_remote((FILE *) NULL);
1751                 }
1752                 pswitch(1);
1753                 if (ptabflg)
1754                         code = -1;
1755                 (void)signal(SIGINT, oldintr);
1756                 return;
1757         }
1758         if (cpend)
1759                 abort_remote((FILE *) NULL);
1760         pswitch(!proxy);
1761         if (!cpend && !secndflag) {  /* only if cmd = "RETR" (proxy=1) */
1762                 if (command("%s %s", cmd2, local) != PRELIM) {
1763                         pswitch(0);
1764                         if (cpend)
1765                                 abort_remote((FILE *) NULL);
1766                         pswitch(1);
1767                         if (ptabflg)
1768                                 code = -1;
1769                         (void)signal(SIGINT, oldintr);
1770                         return;
1771                 }
1772         }
1773         if (cpend)
1774                 abort_remote((FILE *) NULL);
1775         pswitch(!proxy);
1776         if (cpend) {
1777                 FD_ZERO(&mask);
1778                 FD_SET(fileno(cin), &mask);
1779                 if ((nfnd = empty(&mask, 10)) <= 0) {
1780                         if (nfnd < 0) {
1781                                 warn("abort");
1782                         }
1783                         if (ptabflg)
1784                                 code = -1;
1785                         lostpeer();
1786                 }
1787                 (void)getreply(0);
1788                 (void)getreply(0);
1789         }
1790         if (proxy)
1791                 pswitch(0);
1792         pswitch(1);
1793         if (ptabflg)
1794                 code = -1;
1795         (void)signal(SIGINT, oldintr);
1796 }
1797
1798 void
1799 reset(int argc, char **argv)
1800 {
1801         fd_set mask;
1802         int nfnd = 1;
1803
1804         FD_ZERO(&mask);
1805         while (nfnd > 0) {
1806                 FD_SET(fileno(cin), &mask);
1807                 if ((nfnd = empty(&mask, 0)) < 0) {
1808                         warn("reset");
1809                         code = -1;
1810                         lostpeer();
1811                 }
1812                 else if (nfnd) {
1813                         (void)getreply(0);
1814                 }
1815         }
1816 }
1817
1818 char *
1819 gunique(const char *local)
1820 {
1821         static char new[MAXPATHLEN];
1822         char *cp = strrchr(local, '/');
1823         int d, count=0;
1824         char ext = '1';
1825
1826         if (cp)
1827                 *cp = '\0';
1828         d = access(cp == local ? "/" : cp ? local : ".", W_OK);
1829         if (cp)
1830                 *cp = '/';
1831         if (d < 0) {
1832                 warn("local: %s", local);
1833                 return ((char *) 0);
1834         }
1835         (void)strcpy(new, local);
1836         cp = new + strlen(new);
1837         *cp++ = '.';
1838         while (!d) {
1839                 if (++count == 100) {
1840                         puts("runique: can't find unique file name.");
1841                         return ((char *) 0);
1842                 }
1843                 *cp++ = ext;
1844                 *cp = '\0';
1845                 if (ext == '9')
1846                         ext = '0';
1847                 else
1848                         ext++;
1849                 if ((d = access(new, F_OK)) < 0)
1850                         break;
1851                 if (ext != '0')
1852                         cp--;
1853                 else if (*(cp - 2) == '.')
1854                         *(cp - 1) = '1';
1855                 else {
1856                         *(cp - 2) = *(cp - 2) + 1;
1857                         cp--;
1858                 }
1859         }
1860         return (new);
1861 }
1862
1863 void
1864 abort_remote(FILE *din)
1865 {
1866         char buf[BUFSIZ];
1867         int nfnd;
1868         fd_set mask;
1869
1870         if (cout == NULL) {
1871                 warnx("Lost control connection for abort.");
1872                 if (ptabflg)
1873                         code = -1;
1874                 lostpeer();
1875                 return;
1876         }
1877         /*
1878          * send IAC in urgent mode instead of DM because 4.3BSD places oob mark
1879          * after urgent byte rather than before as is protocol now
1880          */
1881         sprintf(buf, "%c%c%c", IAC, IP, IAC);
1882         if (send(fileno(cout), buf, 3, MSG_OOB) != 3)
1883                 warn("abort");
1884         fprintf(cout, "%cABOR\r\n", DM);
1885         (void)fflush(cout);
1886         FD_ZERO(&mask);
1887         FD_SET(fileno(cin), &mask);
1888         if (din) {
1889                 FD_SET(fileno(din), &mask);
1890         }
1891         if ((nfnd = empty(&mask, 10)) <= 0) {
1892                 if (nfnd < 0) {
1893                         warn("abort");
1894                 }
1895                 if (ptabflg)
1896                         code = -1;
1897                 lostpeer();
1898         }
1899         if (din && FD_ISSET(fileno(din), &mask)) {
1900                 while (read(fileno(din), buf, BUFSIZ) > 0)
1901                         /* LOOP */;
1902         }
1903         if (getreply(0) == ERROR && code == 552) {
1904                 /* 552 needed for nic style abort */
1905                 (void)getreply(0);
1906         }
1907         (void)getreply(0);
1908 }
1909
1910 void
1911 ai_unmapped(struct addrinfo *ai)
1912 {
1913         struct sockaddr_in6 *sin6;
1914         struct sockaddr_in sin;
1915
1916         if (ai->ai_family != AF_INET6)
1917                 return;
1918         if (ai->ai_addrlen != sizeof(struct sockaddr_in6) ||
1919             sizeof(sin) > ai->ai_addrlen)
1920                 return;
1921         sin6 = (struct sockaddr_in6 *)ai->ai_addr;
1922         if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
1923                 return;
1924
1925         memset(&sin, 0, sizeof(sin));
1926         sin.sin_family = AF_INET;
1927         sin.sin_len = sizeof(struct sockaddr_in);
1928         memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12],
1929             sizeof(sin.sin_addr));
1930         sin.sin_port = sin6->sin6_port;
1931
1932         ai->ai_family = AF_INET;
1933         memcpy(ai->ai_addr, &sin, sin.sin_len);
1934         ai->ai_addrlen = sin.sin_len;
1935 }