1 /* $NetBSD: ftp.c,v 1.24 2021/08/27 01:38:49 lukem Exp $ */ 2 /* from NetBSD: ftp.c,v 1.174 2021/08/26 06:23:24 lukem Exp */ 3 4 /*- 5 * Copyright (c) 1996-2021 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Luke Mewburn. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1985, 1989, 1993, 1994 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 */ 61 62 /* 63 * Copyright (C) 1997 and 1998 WIDE Project. 64 * All rights reserved. 65 * 66 * Redistribution and use in source and binary forms, with or without 67 * modification, are permitted provided that the following conditions 68 * are met: 69 * 1. Redistributions of source code must retain the above copyright 70 * notice, this list of conditions and the following disclaimer. 71 * 2. Redistributions in binary form must reproduce the above copyright 72 * notice, this list of conditions and the following disclaimer in the 73 * documentation and/or other materials provided with the distribution. 74 * 3. Neither the name of the project nor the names of its contributors 75 * may be used to endorse or promote products derived from this software 76 * without specific prior written permission. 77 * 78 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 79 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 80 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 81 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 82 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 83 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 84 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 85 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 86 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 87 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 88 * SUCH DAMAGE. 89 */ 90 91 #include "tnftp.h" 92 #include <arpa/telnet.h> 93 94 #if 0 /* tnftp */ 95 96 #include <sys/cdefs.h> 97 #ifndef lint 98 #if 0 99 static char sccsid[] = "@(#)ftp.c 8.6 (Berkeley) 10/27/94"; 100 #else 101 __RCSID(" NetBSD: ftp.c,v 1.174 2021/08/26 06:23:24 lukem Exp "); 102 #endif 103 #endif /* not lint */ 104 105 #include <sys/types.h> 106 #include <sys/stat.h> 107 #include <sys/socket.h> 108 #include <sys/time.h> 109 110 #include <netinet/in.h> 111 #include <netinet/in_systm.h> 112 #include <netinet/ip.h> 113 #include <arpa/inet.h> 114 #include <arpa/ftp.h> 115 #include <arpa/telnet.h> 116 117 #include <assert.h> 118 #include <ctype.h> 119 #include <err.h> 120 #include <errno.h> 121 #include <fcntl.h> 122 #include <netdb.h> 123 #include <stdio.h> 124 #include <stdlib.h> 125 #include <string.h> 126 #include <time.h> 127 #include <unistd.h> 128 #include <stdarg.h> 129 130 #endif /* tnftp */ 131 132 #include "ftp_var.h" 133 134 volatile sig_atomic_t abrtflag; 135 volatile sig_atomic_t timeoutflag; 136 137 sigjmp_buf ptabort; 138 int ptabflg; 139 int ptflag = 0; 140 char pasv[BUFSIZ]; /* passive port for proxy data connection */ 141 142 static int empty(FILE *, FILE *, int); 143 __dead static void abort_squared(int); 144 145 struct sockinet { 146 union sockunion { 147 struct sockaddr_in su_sin; 148 #ifdef INET6 149 struct sockaddr_in6 su_sin6; 150 #endif 151 } si_su; 152 #if !defined(HAVE_STRUCT_SOCKADDR_IN_SIN_LEN) 153 int si_len; 154 #endif 155 }; 156 157 #if !defined(HAVE_STRUCT_SOCKADDR_IN_SIN_LEN) 158 # define su_len si_len 159 #else 160 # define su_len si_su.su_sin.sin_len 161 #endif 162 #define su_family si_su.su_sin.sin_family 163 #define su_port si_su.su_sin.sin_port 164 165 struct sockinet myctladdr, hisctladdr, data_addr; 166 167 char * 168 hookup(const char *host, const char *port) 169 { 170 int s = -1, error; 171 struct addrinfo hints, *res, *res0; 172 static char hostnamebuf[MAXHOSTNAMELEN]; 173 socklen_t len; 174 int on = 1; 175 176 memset((char *)&hisctladdr, 0, sizeof (hisctladdr)); 177 memset((char *)&myctladdr, 0, sizeof (myctladdr)); 178 memset(&hints, 0, sizeof(hints)); 179 hints.ai_flags = AI_CANONNAME; 180 hints.ai_family = family; 181 hints.ai_socktype = SOCK_STREAM; 182 hints.ai_protocol = 0; 183 error = getaddrinfo(host, port, &hints, &res0); 184 if (error) { 185 warnx("Can't lookup `%s:%s': %s", host, port, 186 (error == EAI_SYSTEM) ? strerror(errno) 187 : gai_strerror(error)); 188 code = -1; 189 return (0); 190 } 191 192 if (res0->ai_canonname) 193 (void)strlcpy(hostnamebuf, res0->ai_canonname, 194 sizeof(hostnamebuf)); 195 else 196 (void)strlcpy(hostnamebuf, host, sizeof(hostnamebuf)); 197 hostname = hostnamebuf; 198 199 for (res = res0; res; res = res->ai_next) { 200 char hname[NI_MAXHOST], sname[NI_MAXSERV]; 201 202 ai_unmapped(res); 203 if (getnameinfo(res->ai_addr, res->ai_addrlen, 204 hname, sizeof(hname), sname, sizeof(sname), 205 NI_NUMERICHOST | NI_NUMERICSERV) != 0) { 206 strlcpy(hname, "?", sizeof(hname)); 207 strlcpy(sname, "?", sizeof(sname)); 208 } 209 if (verbose && res0->ai_next) { 210 /* if we have multiple possibilities */ 211 #ifdef INET6 212 if(res->ai_family == AF_INET6) { 213 fprintf(ttyout, "Trying [%s]:%s ...\n", hname, 214 sname); 215 } else { 216 #endif 217 fprintf(ttyout, "Trying %s:%s ...\n", hname, 218 sname); 219 #ifdef INET6 220 } 221 #endif 222 } 223 s = socket(res->ai_family, SOCK_STREAM, res->ai_protocol); 224 if (s < 0) { 225 warn("Can't create socket for connection to `%s:%s'", 226 hname, sname); 227 continue; 228 } 229 if (ftp_connect(s, res->ai_addr, res->ai_addrlen, 230 verbose || !res->ai_next) < 0) { 231 close(s); 232 s = -1; 233 continue; 234 } 235 236 /* finally we got one */ 237 break; 238 } 239 if (s < 0) { 240 warnx("Can't connect to `%s:%s'", host, port); 241 code = -1; 242 freeaddrinfo(res0); 243 return 0; 244 } 245 memcpy(&hisctladdr.si_su, res->ai_addr, res->ai_addrlen); 246 hisctladdr.su_len = res->ai_addrlen; 247 freeaddrinfo(res0); 248 res0 = res = NULL; 249 250 len = hisctladdr.su_len; 251 if (getsockname(s, (struct sockaddr *)&myctladdr.si_su, &len) == -1) { 252 warn("Can't determine my address of connection to `%s:%s'", 253 host, port); 254 code = -1; 255 goto bad; 256 } 257 myctladdr.su_len = len; 258 259 #ifdef IPTOS_LOWDELAY 260 if (hisctladdr.su_family == AF_INET) { 261 int tos = IPTOS_LOWDELAY; 262 if (setsockopt(s, IPPROTO_IP, IP_TOS, 263 (void *)&tos, sizeof(tos)) == -1) { 264 DWARN("setsockopt %s (ignored)", 265 "IPTOS_LOWDELAY"); 266 } 267 } 268 #endif 269 cin = fdopen(s, "r"); 270 cout = fdopen(s, "w"); 271 if (cin == NULL || cout == NULL) { 272 warnx("Can't fdopen socket"); 273 if (cin) 274 (void)fclose(cin); 275 if (cout) 276 (void)fclose(cout); 277 code = -1; 278 goto bad; 279 } 280 if (verbose) 281 fprintf(ttyout, "Connected to %s.\n", hostname); 282 if (getreply(0) > 2) { /* read startup message from server */ 283 if (cin) 284 (void)fclose(cin); 285 if (cout) 286 (void)fclose(cout); 287 code = -1; 288 goto bad; 289 } 290 291 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 292 (void *)&on, sizeof(on)) == -1) { 293 DWARN("setsockopt %s (ignored)", "SO_KEEPALIVE"); 294 } 295 296 if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, 297 (void *)&on, sizeof(on)) == -1) { 298 DWARN("setsockopt %s (ignored)", "SO_OOBINLINE"); 299 } 300 301 return (hostname); 302 bad: 303 (void)close(s); 304 return (NULL); 305 } 306 307 void 308 cmdabort(int notused) 309 { 310 int oerrno = errno; 311 312 sigint_raised = 1; 313 alarmtimer(0); 314 if (fromatty) 315 write(fileno(ttyout), "\n", 1); 316 abrtflag++; 317 if (ptflag) 318 siglongjmp(ptabort, 1); 319 errno = oerrno; 320 } 321 322 void 323 cmdtimeout(int notused) 324 { 325 int oerrno = errno; 326 327 alarmtimer(0); 328 if (fromatty) 329 write(fileno(ttyout), "\n", 1); 330 timeoutflag++; 331 if (ptflag) 332 siglongjmp(ptabort, 1); 333 errno = oerrno; 334 } 335 336 static int 337 issighandler(sigfunc func) 338 { 339 return (func != SIG_IGN && 340 func != SIG_DFL && 341 #ifdef SIG_HOLD 342 func != SIG_HOLD && 343 #endif 344 func != SIG_ERR); 345 } 346 347 /*VARARGS*/ 348 int 349 command(const char *fmt, ...) 350 { 351 va_list ap; 352 int r; 353 sigfunc oldsigint; 354 355 #ifndef NO_DEBUG 356 if (ftp_debug) { 357 fputs("---> ", ttyout); 358 va_start(ap, fmt); 359 if (strncmp("PASS ", fmt, 5) == 0) 360 fputs("PASS XXXX", ttyout); 361 else if (strncmp("ACCT ", fmt, 5) == 0) 362 fputs("ACCT XXXX", ttyout); 363 else 364 vfprintf(ttyout, fmt, ap); 365 va_end(ap); 366 putc('\n', ttyout); 367 } 368 #endif 369 if (cout == NULL) { 370 warnx("No control connection for command"); 371 code = -1; 372 return (0); 373 } 374 375 abrtflag = 0; 376 377 oldsigint = xsignal(SIGINT, cmdabort); 378 379 va_start(ap, fmt); 380 vfprintf(cout, fmt, ap); 381 va_end(ap); 382 fputs("\r\n", cout); 383 (void)fflush(cout); 384 cpend = 1; 385 r = getreply(!strcmp(fmt, "QUIT")); 386 if (abrtflag && issighandler(oldsigint)) { 387 (*oldsigint)(SIGINT); 388 } 389 (void)xsignal(SIGINT, oldsigint); 390 return (r); 391 } 392 393 static const char *m421[] = { 394 "remote server timed out. Connection closed", 395 "user interrupt. Connection closed", 396 "remote server has closed connection", 397 }; 398 399 int 400 getreply(int expecteof) 401 { 402 char current_line[BUFSIZ]; /* last line of previous reply */ 403 int c, n, lineno; 404 int dig; 405 int originalcode = 0, continuation = 0; 406 sigfunc oldsigint, oldsigalrm; 407 int pflag = 0; 408 char *cp, *pt = pasv; 409 410 abrtflag = 0; 411 timeoutflag = 0; 412 413 oldsigint = xsignal(SIGINT, cmdabort); 414 oldsigalrm = xsignal(SIGALRM, cmdtimeout); 415 416 for (lineno = 0 ;; lineno++) { 417 dig = n = code = 0; 418 cp = current_line; 419 while (alarmtimer(quit_time ? quit_time : 60), 420 ((c = getc(cin)) != '\n')) { 421 if (c == IAC) { /* handle telnet commands */ 422 switch (c = getc(cin)) { 423 case WILL: 424 case WONT: 425 c = getc(cin); 426 fprintf(cout, "%c%c%c", IAC, DONT, c); 427 (void)fflush(cout); 428 break; 429 case DO: 430 case DONT: 431 c = getc(cin); 432 fprintf(cout, "%c%c%c", IAC, WONT, c); 433 (void)fflush(cout); 434 break; 435 default: 436 break; 437 } 438 continue; 439 } 440 dig++; 441 if (c == EOF) { 442 /* 443 * these will get trashed by pswitch() 444 * in lostpeer() 445 */ 446 int reply_timeoutflag = timeoutflag; 447 int reply_abrtflag = abrtflag; 448 449 alarmtimer(0); 450 if (expecteof && feof(cin)) { 451 (void)xsignal(SIGINT, oldsigint); 452 (void)xsignal(SIGALRM, oldsigalrm); 453 code = 221; 454 return (0); 455 } 456 cpend = 0; 457 lostpeer(0); 458 if (verbose) { 459 size_t midx; 460 if (reply_timeoutflag) 461 midx = 0; 462 else if (reply_abrtflag) 463 midx = 1; 464 else 465 midx = 2; 466 (void)fprintf(ttyout, 467 "421 Service not available, %s.\n", m421[midx]); 468 (void)fflush(ttyout); 469 } 470 code = 421; 471 (void)xsignal(SIGINT, oldsigint); 472 (void)xsignal(SIGALRM, oldsigalrm); 473 return (4); 474 } 475 if (c != '\r' && (verbose > 0 || 476 ((verbose > -1 && n == '5' && dig > 4) && 477 (((!n && c < '5') || (n && n < '5')) 478 || !retry_connect)))) { 479 if (proxflag && 480 (dig == 1 || (dig == 5 && verbose == 0))) 481 fprintf(ttyout, "%s:", hostname); 482 (void)putc(c, ttyout); 483 } 484 if (dig < 4 && isdigit(c)) 485 code = code * 10 + (c - '0'); 486 if (!pflag && (code == 227 || code == 228)) 487 pflag = 1; 488 else if (!pflag && code == 229) 489 pflag = 100; 490 if (dig > 4 && pflag == 1 && isdigit(c)) 491 pflag = 2; 492 if (pflag == 2) { 493 if (c != '\r' && c != ')') { 494 if (pt < &pasv[sizeof(pasv) - 1]) 495 *pt++ = c; 496 } else { 497 *pt = '\0'; 498 pflag = 3; 499 } 500 } 501 if (pflag == 100 && c == '(') 502 pflag = 2; 503 if (dig == 4 && c == '-') { 504 if (continuation) 505 code = 0; 506 continuation++; 507 } 508 if (n == 0) 509 n = c; 510 if (cp < ¤t_line[sizeof(current_line) - 1]) 511 *cp++ = c; 512 } 513 if (verbose > 0 || ((verbose > -1 && n == '5') && 514 (n < '5' || !retry_connect))) { 515 (void)putc(c, ttyout); 516 (void)fflush(ttyout); 517 } 518 if (cp[-1] == '\r') 519 cp[-1] = '\0'; 520 *cp = '\0'; 521 if (lineno == 0) 522 (void)strlcpy(reply_string, current_line, 523 sizeof(reply_string)); 524 if (lineno > 0 && code == 0 && reply_callback != NULL) 525 (*reply_callback)(current_line); 526 if (continuation && code != originalcode) { 527 if (originalcode == 0) 528 originalcode = code; 529 continue; 530 } 531 if (n != '1') 532 cpend = 0; 533 alarmtimer(0); 534 (void)xsignal(SIGINT, oldsigint); 535 (void)xsignal(SIGALRM, oldsigalrm); 536 if (code == 421 || originalcode == 421) 537 lostpeer(0); 538 if (abrtflag && oldsigint != cmdabort && 539 issighandler(oldsigint)) { 540 (*oldsigint)(SIGINT); 541 } 542 if (timeoutflag && oldsigalrm != cmdtimeout && 543 issighandler(oldsigalrm)) { 544 (*oldsigalrm)(SIGINT); 545 } 546 return (n - '0'); 547 } 548 } 549 550 static int 551 empty(FILE *ecin, FILE *din, int sec) 552 { 553 int nr, nfd; 554 struct pollfd pfd[2]; 555 556 nfd = 0; 557 if (ecin) { 558 pfd[nfd].fd = fileno(ecin); 559 pfd[nfd++].events = POLLIN; 560 } 561 562 if (din) { 563 pfd[nfd].fd = fileno(din); 564 pfd[nfd++].events = POLLIN; 565 } 566 567 if ((nr = ftp_poll(pfd, nfd, sec * 1000)) <= 0) 568 return nr; 569 570 nr = 0; 571 nfd = 0; 572 if (ecin) 573 nr |= (pfd[nfd++].revents & POLLIN) ? 1 : 0; 574 if (din) 575 nr |= (pfd[nfd++].revents & POLLIN) ? 2 : 0; 576 return nr; 577 } 578 579 sigjmp_buf xferabort; 580 581 __dead static void 582 abortxfer(int notused) 583 { 584 char msgbuf[100]; 585 size_t len; 586 587 sigint_raised = 1; 588 alarmtimer(0); 589 mflag = 0; 590 abrtflag = 0; 591 switch (direction[0]) { 592 case 'r': 593 strlcpy(msgbuf, "\nreceive", sizeof(msgbuf)); 594 break; 595 case 's': 596 strlcpy(msgbuf, "\nsend", sizeof(msgbuf)); 597 break; 598 default: 599 errx(1, "abortxfer: unknown direction `%s'", direction); 600 } 601 len = strlcat(msgbuf, " aborted. Waiting for remote to finish abort.\n", 602 sizeof(msgbuf)); 603 write(fileno(ttyout), msgbuf, len); 604 siglongjmp(xferabort, 1); 605 } 606 607 /* 608 * Read data from infd & write to outfd, using buf/bufsize as the temporary 609 * buffer, dealing with short reads or writes. 610 * If rate_limit != 0, rate-limit the transfer. 611 * If hash_interval != 0, fputc('c', ttyout) every hash_interval bytes. 612 * Updates global variables: bytes. 613 * Returns 0 if ok, 1 if there was a read error, 2 if there was a write error. 614 * In the case of error, errno contains the appropriate error code. 615 */ 616 static int 617 copy_bytes(int infd, int outfd, char *buf, size_t bufsize, 618 int rate_limit, int hash_interval) 619 { 620 volatile off_t hashc; 621 ssize_t inc, outc; 622 char *bufp; 623 struct timeval tvthen, tvnow, tvdiff; 624 off_t bufrem, bufchunk; 625 int serr; 626 627 hashc = hash_interval; 628 if (rate_limit) 629 bufchunk = rate_limit; 630 else 631 bufchunk = bufsize; 632 633 while (1) { 634 if (rate_limit) { 635 (void)gettimeofday(&tvthen, NULL); 636 } 637 errno = 0; 638 inc = outc = 0; 639 /* copy bufchunk at a time */ 640 bufrem = bufchunk; 641 while (bufrem > 0) { 642 inc = read(infd, buf, MIN((off_t)bufsize, bufrem)); 643 if (inc < 0) { 644 if (errno == EINTR || errno == EAGAIN) { 645 continue; 646 } 647 goto copy_done; 648 } else if (inc == 0) { 649 goto copy_done; 650 } 651 bytes += inc; 652 bufrem -= inc; 653 bufp = buf; 654 while (inc > 0) { 655 outc = write(outfd, bufp, inc); 656 if (outc < 0) { 657 if (errno == EINTR || errno == EAGAIN) { 658 continue; 659 } 660 goto copy_done; 661 } 662 inc -= outc; 663 bufp += outc; 664 } 665 if (hash_interval) { 666 while (bytes >= hashc) { 667 (void)putc('#', ttyout); 668 hashc += hash_interval; 669 } 670 (void)fflush(ttyout); 671 } 672 } 673 if (rate_limit) { /* rate limited; wait if necessary */ 674 while (1) { 675 (void)gettimeofday(&tvnow, NULL); 676 timersub(&tvnow, &tvthen, &tvdiff); 677 if (tvdiff.tv_sec > 0) 678 break; 679 usleep(1000000 - tvdiff.tv_usec); 680 } 681 } 682 } 683 684 copy_done: 685 serr = errno; 686 if (hash_interval && bytes > 0) { 687 if (bytes < hash_interval) 688 (void)putc('#', ttyout); 689 (void)putc('\n', ttyout); 690 (void)fflush(ttyout); 691 } 692 errno = serr; 693 if (inc == -1) 694 return 1; 695 if (outc == -1) 696 return 2; 697 698 return 0; 699 } 700 701 void 702 sendrequest(const char *cmd, const char *local, const char *remote, 703 int printnames) 704 { 705 struct stat st; 706 int c; 707 FILE *volatile fin; 708 FILE *volatile dout; 709 int (*volatile closefunc)(FILE *); 710 sigfunc volatile oldintr; 711 sigfunc volatile oldpipe; 712 off_t volatile hashbytes; 713 int hash_interval; 714 const char *lmode; 715 static size_t bufsize; 716 static char *buf; 717 int oprogress; 718 719 hashbytes = mark; 720 direction = "sent"; 721 dout = NULL; 722 bytes = 0; 723 filesize = -1; 724 oprogress = progress; 725 if (verbose && printnames) { 726 if (*local != '-') 727 fprintf(ttyout, "local: %s ", local); 728 if (remote) 729 fprintf(ttyout, "remote: %s\n", remote); 730 } 731 if (proxy) { 732 proxtrans(cmd, local, remote); 733 return; 734 } 735 if (curtype != type) 736 changetype(type, 0); 737 closefunc = NULL; 738 oldintr = SIG_ERR; 739 oldpipe = SIG_ERR; 740 lmode = "w"; 741 if (sigsetjmp(xferabort, 1)) { 742 while (cpend) 743 (void)getreply(0); 744 code = -1; 745 goto cleanupsend; 746 } 747 (void)xsignal(SIGQUIT, psummary); 748 oldintr = xsignal(SIGINT, abortxfer); 749 if (strcmp(local, "-") == 0) { 750 fin = stdin; 751 progress = 0; 752 } else if (*local == '|') { 753 oldpipe = xsignal(SIGPIPE, SIG_IGN); 754 fin = popen(local + 1, "r"); 755 if (fin == NULL) { 756 warn("Can't execute `%s'", local + 1); 757 code = -1; 758 goto cleanupsend; 759 } 760 progress = 0; 761 closefunc = pclose; 762 } else { 763 fin = fopen(local, "r"); 764 if (fin == NULL) { 765 warn("Can't open `%s'", local); 766 code = -1; 767 goto cleanupsend; 768 } 769 closefunc = fclose; 770 if (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode)) { 771 fprintf(ttyout, "%s: not a plain file.\n", local); 772 code = -1; 773 goto cleanupsend; 774 } 775 filesize = st.st_size; 776 } 777 if (initconn()) { 778 code = -1; 779 goto cleanupsend; 780 } 781 if (sigsetjmp(xferabort, 1)) 782 goto abort; 783 784 if (restart_point && 785 (strcmp(cmd, "STOR") == 0 || strcmp(cmd, "APPE") == 0)) { 786 int rc; 787 788 rc = -1; 789 switch (curtype) { 790 case TYPE_A: 791 rc = fseeko(fin, restart_point, SEEK_SET); 792 break; 793 case TYPE_I: 794 case TYPE_L: 795 rc = lseek(fileno(fin), restart_point, SEEK_SET); 796 break; 797 } 798 if (rc < 0) { 799 warn("Can't seek to restart `%s'", local); 800 goto cleanupsend; 801 } 802 if (command("REST " LLF, (LLT)restart_point) != CONTINUE) 803 goto cleanupsend; 804 lmode = "r+"; 805 } 806 if (remote) { 807 if (command("%s %s", cmd, remote) != PRELIM) 808 goto cleanupsend; 809 } else { 810 if (command("%s", cmd) != PRELIM) 811 goto cleanupsend; 812 } 813 dirchange = 1; 814 dout = dataconn(lmode); 815 if (dout == NULL) 816 goto abort; 817 818 assert(sndbuf_size > 0); 819 if ((size_t)sndbuf_size > bufsize) { 820 if (buf) 821 (void)free(buf); 822 bufsize = sndbuf_size; 823 buf = ftp_malloc(bufsize); 824 } 825 826 progressmeter(-1); 827 if (oldpipe == SIG_ERR) { 828 oldpipe = xsignal(SIGPIPE, SIG_IGN); 829 } 830 hash_interval = (hash && (!progress || filesize < 0)) ? mark : 0; 831 832 switch (curtype) { 833 834 case TYPE_I: 835 case TYPE_L: 836 c = copy_bytes(fileno(fin), fileno(dout), buf, bufsize, 837 rate_put, hash_interval); 838 if (c == 1) { 839 warn("Reading `%s'", local); 840 } else if (c == 2) { 841 if (errno != EPIPE) 842 warn("Writing to network"); 843 bytes = -1; 844 } 845 break; 846 847 case TYPE_A: 848 while ((c = getc(fin)) != EOF) { 849 if (c == '\n') { 850 while (hash_interval && bytes >= hashbytes) { 851 (void)putc('#', ttyout); 852 (void)fflush(ttyout); 853 hashbytes += mark; 854 } 855 if (ferror(dout)) 856 break; 857 (void)putc('\r', dout); 858 bytes++; 859 } 860 (void)putc(c, dout); 861 bytes++; 862 #if 0 /* this violates RFC 959 */ 863 if (c == '\r') { 864 (void)putc('\0', dout); 865 bytes++; 866 } 867 #endif 868 } 869 if (hash_interval) { 870 if (bytes < hashbytes) 871 (void)putc('#', ttyout); 872 (void)putc('\n', ttyout); 873 } 874 if (ferror(fin)) 875 warn("Reading `%s'", local); 876 if (ferror(dout)) { 877 if (errno != EPIPE) 878 warn("Writing to network"); 879 bytes = -1; 880 } 881 break; 882 } 883 884 progressmeter(1); 885 if (closefunc != NULL) { 886 (*closefunc)(fin); 887 fin = NULL; 888 } 889 (void)fclose(dout); 890 dout = NULL; 891 (void)getreply(0); 892 if (bytes > 0) 893 ptransfer(0); 894 goto cleanupsend; 895 896 abort: 897 (void)xsignal(SIGINT, oldintr); 898 oldintr = SIG_ERR; 899 if (!cpend) { 900 code = -1; 901 goto cleanupsend; 902 } 903 if (data >= 0) { 904 (void)close(data); 905 data = -1; 906 } 907 if (dout) { 908 (void)fclose(dout); 909 dout = NULL; 910 } 911 (void)getreply(0); 912 code = -1; 913 if (bytes > 0) 914 ptransfer(0); 915 916 cleanupsend: 917 if (oldintr != SIG_ERR) 918 (void)xsignal(SIGINT, oldintr); 919 if (oldpipe != SIG_ERR) 920 (void)xsignal(SIGPIPE, oldpipe); 921 if (data >= 0) { 922 (void)close(data); 923 data = -1; 924 } 925 if (closefunc != NULL && fin != NULL) 926 (*closefunc)(fin); 927 if (dout) 928 (void)fclose(dout); 929 progress = oprogress; 930 restart_point = 0; 931 bytes = 0; 932 } 933 934 void 935 recvrequest(const char *cmd, const char *volatile local, const char *remote, 936 const char *lmode, int printnames, int ignorespecial) 937 { 938 FILE *volatile fout; 939 FILE *volatile din; 940 int (*volatile closefunc)(FILE *); 941 sigfunc volatile oldintr; 942 sigfunc volatile oldpipe; 943 int c, d; 944 int volatile is_retr; 945 int volatile tcrflag; 946 int volatile bare_lfs; 947 static size_t bufsize; 948 static char *buf; 949 off_t volatile hashbytes; 950 int hash_interval; 951 struct stat st; 952 time_t mtime; 953 struct timeval tval[2]; 954 int oprogress; 955 int opreserve; 956 957 fout = NULL; 958 din = NULL; 959 hashbytes = mark; 960 direction = "received"; 961 bytes = 0; 962 bare_lfs = 0; 963 filesize = -1; 964 oprogress = progress; 965 opreserve = preserve; 966 is_retr = (strcmp(cmd, "RETR") == 0); 967 if (is_retr && verbose && printnames) { 968 if (ignorespecial || *local != '-') 969 fprintf(ttyout, "local: %s ", local); 970 if (remote) 971 fprintf(ttyout, "remote: %s\n", remote); 972 } 973 if (proxy && is_retr) { 974 proxtrans(cmd, local, remote); 975 return; 976 } 977 closefunc = NULL; 978 oldintr = SIG_ERR; 979 oldpipe = SIG_ERR; 980 tcrflag = !crflag && is_retr; 981 if (sigsetjmp(xferabort, 1)) { 982 while (cpend) 983 (void)getreply(0); 984 code = -1; 985 goto cleanuprecv; 986 } 987 (void)xsignal(SIGQUIT, psummary); 988 oldintr = xsignal(SIGINT, abortxfer); 989 if (ignorespecial || (strcmp(local, "-") && *local != '|')) { 990 if (access(local, W_OK) < 0) { 991 char *dir = strrchr(local, '/'); 992 993 if (errno != ENOENT && errno != EACCES) { 994 warn("Can't access `%s'", local); 995 code = -1; 996 goto cleanuprecv; 997 } 998 if (dir != NULL) 999 *dir = 0; 1000 d = access(dir == local ? "/" : 1001 dir ? local : ".", W_OK); 1002 if (dir != NULL) 1003 *dir = '/'; 1004 if (d < 0) { 1005 warn("Can't access `%s'", local); 1006 code = -1; 1007 goto cleanuprecv; 1008 } 1009 if (!runique && errno == EACCES && 1010 chmod(local, (S_IRUSR|S_IWUSR)) < 0) { 1011 warn("Can't chmod `%s'", local); 1012 code = -1; 1013 goto cleanuprecv; 1014 } 1015 if (runique && errno == EACCES && 1016 (local = gunique(local)) == NULL) { 1017 code = -1; 1018 goto cleanuprecv; 1019 } 1020 } 1021 else if (runique && (local = gunique(local)) == NULL) { 1022 code = -1; 1023 goto cleanuprecv; 1024 } 1025 } 1026 if (!is_retr) { 1027 if (curtype != TYPE_A) 1028 changetype(TYPE_A, 0); 1029 } else { 1030 if (curtype != type) 1031 changetype(type, 0); 1032 filesize = remotesize(remote, 0); 1033 if (code == 421 || code == -1) 1034 goto cleanuprecv; 1035 } 1036 if (initconn()) { 1037 code = -1; 1038 goto cleanuprecv; 1039 } 1040 if (sigsetjmp(xferabort, 1)) 1041 goto abort; 1042 if (is_retr && restart_point && 1043 command("REST " LLF, (LLT) restart_point) != CONTINUE) 1044 goto cleanuprecv; 1045 if (! EMPTYSTRING(remote)) { 1046 if (command("%s %s", cmd, remote) != PRELIM) 1047 goto cleanuprecv; 1048 } else { 1049 if (command("%s", cmd) != PRELIM) 1050 goto cleanuprecv; 1051 } 1052 din = dataconn("r"); 1053 if (din == NULL) 1054 goto abort; 1055 if (!ignorespecial && strcmp(local, "-") == 0) { 1056 fout = stdout; 1057 progress = 0; 1058 preserve = 0; 1059 } else if (!ignorespecial && *local == '|') { 1060 oldpipe = xsignal(SIGPIPE, SIG_IGN); 1061 fout = popen(local + 1, "w"); 1062 if (fout == NULL) { 1063 warn("Can't execute `%s'", local+1); 1064 goto abort; 1065 } 1066 progress = 0; 1067 preserve = 0; 1068 closefunc = pclose; 1069 } else { 1070 fout = fopen(local, lmode); 1071 if (fout == NULL) { 1072 warn("Can't open `%s'", local); 1073 goto abort; 1074 } 1075 closefunc = fclose; 1076 } 1077 1078 if (fstat(fileno(fout), &st) != -1 && !S_ISREG(st.st_mode)) { 1079 progress = 0; 1080 preserve = 0; 1081 } 1082 assert(rcvbuf_size > 0); 1083 if ((size_t)rcvbuf_size > bufsize) { 1084 if (buf) 1085 (void)free(buf); 1086 bufsize = rcvbuf_size; 1087 buf = ftp_malloc(bufsize); 1088 } 1089 1090 progressmeter(-1); 1091 hash_interval = (hash && (!progress || filesize < 0)) ? mark : 0; 1092 1093 switch (curtype) { 1094 1095 case TYPE_I: 1096 case TYPE_L: 1097 if (is_retr && restart_point && 1098 lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1099 warn("Can't seek to restart `%s'", local); 1100 goto cleanuprecv; 1101 } 1102 c = copy_bytes(fileno(din), fileno(fout), buf, bufsize, 1103 rate_get, hash_interval); 1104 if (c == 1) { 1105 if (errno != EPIPE) 1106 warn("Reading from network"); 1107 bytes = -1; 1108 } else if (c == 2) { 1109 warn("Writing `%s'", local); 1110 } 1111 break; 1112 1113 case TYPE_A: 1114 if (is_retr && restart_point) { 1115 int ch; 1116 off_t i; 1117 1118 if (fseeko(fout, (off_t)0, SEEK_SET) < 0) 1119 goto done; 1120 for (i = 0; i++ < restart_point;) { 1121 if ((ch = getc(fout)) == EOF) 1122 goto done; 1123 if (ch == '\n') 1124 i++; 1125 } 1126 if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) { 1127 done: 1128 warn("Can't seek to restart `%s'", local); 1129 goto cleanuprecv; 1130 } 1131 } 1132 while ((c = getc(din)) != EOF) { 1133 if (c == '\n') 1134 bare_lfs++; 1135 while (c == '\r') { 1136 while (hash_interval && bytes >= hashbytes) { 1137 (void)putc('#', ttyout); 1138 (void)fflush(ttyout); 1139 hashbytes += mark; 1140 } 1141 bytes++; 1142 if ((c = getc(din)) != '\n' || tcrflag) { 1143 if (ferror(fout)) 1144 goto break2; 1145 (void)putc('\r', fout); 1146 if (c == '\0') { 1147 bytes++; 1148 goto contin2; 1149 } 1150 if (c == EOF) 1151 goto contin2; 1152 } 1153 } 1154 (void)putc(c, fout); 1155 bytes++; 1156 contin2: ; 1157 } 1158 break2: 1159 if (hash_interval) { 1160 if (bytes < hashbytes) 1161 (void)putc('#', ttyout); 1162 (void)putc('\n', ttyout); 1163 } 1164 if (ferror(din)) { 1165 if (errno != EPIPE) 1166 warn("Reading from network"); 1167 bytes = -1; 1168 } 1169 if (ferror(fout)) 1170 warn("Writing `%s'", local); 1171 break; 1172 } 1173 1174 progressmeter(1); 1175 if (closefunc != NULL) { 1176 (*closefunc)(fout); 1177 fout = NULL; 1178 } 1179 (void)fclose(din); 1180 din = NULL; 1181 (void)getreply(0); 1182 if (bare_lfs) { 1183 fprintf(ttyout, 1184 "WARNING! %d bare linefeeds received in ASCII mode.\n", 1185 bare_lfs); 1186 fputs("File may not have transferred correctly.\n", ttyout); 1187 } 1188 if (bytes >= 0 && is_retr) { 1189 if (bytes > 0) 1190 ptransfer(0); 1191 if (preserve && (closefunc == fclose)) { 1192 mtime = remotemodtime(remote, 0); 1193 if (mtime != -1) { 1194 (void)gettimeofday(&tval[0], NULL); 1195 tval[1].tv_sec = mtime; 1196 tval[1].tv_usec = 0; 1197 if (utimes(local, tval) == -1) { 1198 fprintf(ttyout, 1199 "Can't change modification time on %s to %s", 1200 local, 1201 rfc2822time(localtime(&mtime))); 1202 } 1203 } 1204 } 1205 } 1206 goto cleanuprecv; 1207 1208 abort: 1209 /* 1210 * abort using RFC 959 recommended IP,SYNC sequence 1211 */ 1212 if (! sigsetjmp(xferabort, 1)) { 1213 /* this is the first call */ 1214 (void)xsignal(SIGINT, abort_squared); 1215 if (!cpend) { 1216 code = -1; 1217 goto cleanuprecv; 1218 } 1219 abort_remote(din); 1220 } 1221 code = -1; 1222 if (bytes > 0) 1223 ptransfer(0); 1224 1225 cleanuprecv: 1226 if (oldintr != SIG_ERR) 1227 (void)xsignal(SIGINT, oldintr); 1228 if (oldpipe != SIG_ERR) 1229 (void)xsignal(SIGPIPE, oldpipe); 1230 if (data >= 0) { 1231 (void)close(data); 1232 data = -1; 1233 } 1234 if (closefunc != NULL && fout != NULL) 1235 (*closefunc)(fout); 1236 if (din) 1237 (void)fclose(din); 1238 progress = oprogress; 1239 preserve = opreserve; 1240 bytes = 0; 1241 } 1242 1243 /* 1244 * Need to start a listen on the data channel before we send the command, 1245 * otherwise the server's connect may fail. 1246 */ 1247 int 1248 initconn(void) 1249 { 1250 char *p, *a; 1251 int result, tmpno = 0; 1252 int on = 1; 1253 int error; 1254 unsigned int addr[16], port[2]; 1255 unsigned int af, hal, pal; 1256 socklen_t len; 1257 const char *pasvcmd = NULL; 1258 int overbose; 1259 1260 #ifdef INET6 1261 #ifndef NO_DEBUG 1262 if (myctladdr.su_family == AF_INET6 && ftp_debug && 1263 (IN6_IS_ADDR_LINKLOCAL(&myctladdr.si_su.su_sin6.sin6_addr) || 1264 IN6_IS_ADDR_SITELOCAL(&myctladdr.si_su.su_sin6.sin6_addr))) { 1265 warnx("Use of scoped addresses can be troublesome"); 1266 } 1267 #endif 1268 #endif 1269 1270 reinit: 1271 if (passivemode) { 1272 data_addr = myctladdr; 1273 data = socket(data_addr.su_family, SOCK_STREAM, 0); 1274 if (data < 0) { 1275 warn("Can't create socket for data connection"); 1276 return (1); 1277 } 1278 if ((options & SO_DEBUG) && 1279 setsockopt(data, SOL_SOCKET, SO_DEBUG, 1280 (void *)&on, sizeof(on)) == -1) { 1281 DWARN("setsockopt %s (ignored)", "SO_DEBUG"); 1282 } 1283 result = COMPLETE + 1; 1284 switch (data_addr.su_family) { 1285 case AF_INET: 1286 if (epsv4 && !epsv4bad) { 1287 pasvcmd = "EPSV"; 1288 overbose = verbose; 1289 if (ftp_debug == 0) 1290 verbose = -1; 1291 result = command("EPSV"); 1292 verbose = overbose; 1293 if (verbose > 0 && 1294 (result == COMPLETE || !connected)) 1295 fprintf(ttyout, "%s\n", reply_string); 1296 if (!connected) 1297 return (1); 1298 /* 1299 * this code is to be friendly with broken 1300 * BSDI ftpd 1301 */ 1302 if (code / 10 == 22 && code != 229) { 1303 fputs( 1304 "wrong server: return code must be 229\n", 1305 ttyout); 1306 result = COMPLETE + 1; 1307 } 1308 if (result != COMPLETE) { 1309 epsv4bad = 1; 1310 DPRINTF("disabling epsv4 for this " 1311 "connection\n"); 1312 } 1313 } 1314 if (result != COMPLETE) { 1315 pasvcmd = "PASV"; 1316 result = command("PASV"); 1317 if (!connected) 1318 return (1); 1319 } 1320 break; 1321 #ifdef INET6 1322 case AF_INET6: 1323 if (epsv6 && !epsv6bad) { 1324 pasvcmd = "EPSV"; 1325 overbose = verbose; 1326 if (ftp_debug == 0) 1327 verbose = -1; 1328 result = command("EPSV"); 1329 verbose = overbose; 1330 if (verbose > 0 && 1331 (result == COMPLETE || !connected)) 1332 fprintf(ttyout, "%s\n", reply_string); 1333 if (!connected) 1334 return (1); 1335 /* 1336 * this code is to be friendly with 1337 * broken BSDI ftpd 1338 */ 1339 if (code / 10 == 22 && code != 229) { 1340 fputs( 1341 "wrong server: return code must be 229\n", 1342 ttyout); 1343 result = COMPLETE + 1; 1344 } 1345 if (result != COMPLETE) { 1346 epsv6bad = 1; 1347 DPRINTF("disabling epsv6 for this " 1348 "connection\n"); 1349 } 1350 } 1351 if (result != COMPLETE) { 1352 pasvcmd = "LPSV"; 1353 result = command("LPSV"); 1354 } 1355 if (!connected) 1356 return (1); 1357 break; 1358 #endif 1359 default: 1360 result = COMPLETE + 1; 1361 break; 1362 } 1363 if (result != COMPLETE) { 1364 if (activefallback) { 1365 (void)close(data); 1366 data = -1; 1367 passivemode = 0; 1368 #if 0 1369 activefallback = 0; 1370 #endif 1371 goto reinit; 1372 } 1373 fputs("Passive mode refused.\n", ttyout); 1374 goto bad; 1375 } 1376 1377 #define pack2(var, off) \ 1378 (((var[(off) + 0] & 0xff) << 8) | ((var[(off) + 1] & 0xff) << 0)) 1379 #define pack4(var, off) \ 1380 (((var[(off) + 0] & 0xff) << 24) | ((var[(off) + 1] & 0xff) << 16) | \ 1381 ((var[(off) + 2] & 0xff) << 8) | ((var[(off) + 3] & 0xff) << 0)) 1382 #define UC(b) (((int)b)&0xff) 1383 1384 /* 1385 * What we've got at this point is a string of comma separated 1386 * one-byte unsigned integer values, separated by commas. 1387 */ 1388 if (strcmp(pasvcmd, "PASV") == 0) { 1389 if (data_addr.su_family != AF_INET) { 1390 fputs( 1391 "Passive mode AF mismatch. Shouldn't happen!\n", ttyout); 1392 goto bad; 1393 } 1394 if (code / 10 == 22 && code != 227) { 1395 fputs("wrong server: return code must be 227\n", 1396 ttyout); 1397 goto bad; 1398 } 1399 error = sscanf(pasv, "%u,%u,%u,%u,%u,%u", 1400 &addr[0], &addr[1], &addr[2], &addr[3], 1401 &port[0], &port[1]); 1402 if (error != 6) { 1403 fputs( 1404 "Passive mode address scan failure. Shouldn't happen!\n", ttyout); 1405 goto bad; 1406 } 1407 memset(&data_addr, 0, sizeof(data_addr)); 1408 data_addr.su_family = AF_INET; 1409 data_addr.su_len = sizeof(struct sockaddr_in); 1410 data_addr.si_su.su_sin.sin_addr.s_addr = 1411 htonl(pack4(addr, 0)); 1412 data_addr.su_port = htons(pack2(port, 0)); 1413 if (data_addr.si_su.su_sin.sin_addr.s_addr != 1414 hisctladdr.si_su.su_sin.sin_addr.s_addr) { 1415 fputs("Passive mode address mismatch.\n", 1416 ttyout); 1417 goto bad; 1418 } 1419 } else if (strcmp(pasvcmd, "LPSV") == 0) { 1420 if (code / 10 == 22 && code != 228) { 1421 fputs("wrong server: return code must be 228\n", 1422 ttyout); 1423 goto bad; 1424 } 1425 switch (data_addr.su_family) { 1426 case AF_INET: 1427 error = sscanf(pasv, 1428 "%u,%u,%u,%u,%u,%u,%u,%u,%u", 1429 &af, &hal, 1430 &addr[0], &addr[1], &addr[2], &addr[3], 1431 &pal, &port[0], &port[1]); 1432 if (error != 9) { 1433 fputs( 1434 "Passive mode address scan failure. Shouldn't happen!\n", ttyout); 1435 goto bad; 1436 } 1437 if (af != 4 || hal != 4 || pal != 2) { 1438 fputs( 1439 "Passive mode AF mismatch. Shouldn't happen!\n", ttyout); 1440 goto bad; 1441 } 1442 1443 memset(&data_addr, 0, sizeof(data_addr)); 1444 data_addr.su_family = AF_INET; 1445 data_addr.su_len = sizeof(struct sockaddr_in); 1446 data_addr.si_su.su_sin.sin_addr.s_addr = 1447 htonl(pack4(addr, 0)); 1448 data_addr.su_port = htons(pack2(port, 0)); 1449 if (data_addr.si_su.su_sin.sin_addr.s_addr != 1450 hisctladdr.si_su.su_sin.sin_addr.s_addr) { 1451 fputs("Passive mode address mismatch.\n", 1452 ttyout); 1453 goto bad; 1454 } 1455 break; 1456 #ifdef INET6 1457 case AF_INET6: 1458 error = sscanf(pasv, 1459 "%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u", 1460 &af, &hal, 1461 &addr[0], &addr[1], &addr[2], &addr[3], 1462 &addr[4], &addr[5], &addr[6], &addr[7], 1463 &addr[8], &addr[9], &addr[10], 1464 &addr[11], &addr[12], &addr[13], 1465 &addr[14], &addr[15], 1466 &pal, &port[0], &port[1]); 1467 if (error != 21) { 1468 fputs( 1469 "Passive mode address scan failure. Shouldn't happen!\n", ttyout); 1470 goto bad; 1471 } 1472 if (af != 6 || hal != 16 || pal != 2) { 1473 fputs( 1474 "Passive mode AF mismatch. Shouldn't happen!\n", ttyout); 1475 goto bad; 1476 } 1477 1478 memset(&data_addr, 0, sizeof(data_addr)); 1479 data_addr.su_family = AF_INET6; 1480 data_addr.su_len = sizeof(struct sockaddr_in6); 1481 { 1482 size_t i; 1483 for (i = 0; i < sizeof(struct in6_addr); i++) { 1484 data_addr.si_su.su_sin6.sin6_addr.s6_addr[i] = 1485 UC(addr[i]); 1486 } 1487 } 1488 data_addr.su_port = htons(pack2(port, 0)); 1489 if (memcmp( 1490 &data_addr.si_su.su_sin6.sin6_addr, 1491 &hisctladdr.si_su.su_sin6.sin6_addr, 1492 sizeof(data_addr.si_su.su_sin6.sin6_addr))) { 1493 fputs("Passive mode address mismatch.\n", 1494 ttyout); 1495 goto bad; 1496 } 1497 break; 1498 #endif 1499 default: 1500 fputs("Unknown passive mode AF.\n", ttyout); 1501 goto bad; 1502 } 1503 } else if (strcmp(pasvcmd, "EPSV") == 0) { 1504 char delim[4]; 1505 1506 port[0] = 0; 1507 if (code / 10 == 22 && code != 229) { 1508 fputs("wrong server: return code must be 229\n", 1509 ttyout); 1510 goto bad; 1511 } 1512 if (sscanf(pasv, "%c%c%c%d%c", &delim[0], 1513 &delim[1], &delim[2], &port[1], 1514 &delim[3]) != 5) { 1515 fputs("parse error!\n", ttyout); 1516 goto bad; 1517 } 1518 if (delim[0] != delim[1] || delim[0] != delim[2] 1519 || delim[0] != delim[3]) { 1520 fputs("parse error!\n", ttyout); 1521 goto bad; 1522 } 1523 data_addr = hisctladdr; 1524 data_addr.su_port = htons(port[1]); 1525 } else 1526 goto bad; 1527 1528 if (ftp_connect(data, (struct sockaddr *)&data_addr.si_su, 1529 data_addr.su_len, 1) < 0) { 1530 if (activefallback) { 1531 (void)close(data); 1532 data = -1; 1533 passivemode = 0; 1534 #if 0 1535 activefallback = 0; 1536 #endif 1537 goto reinit; 1538 } 1539 goto bad; 1540 } 1541 #ifdef IPTOS_THROUGHPUT 1542 if (data_addr.su_family == AF_INET) { 1543 on = IPTOS_THROUGHPUT; 1544 if (setsockopt(data, IPPROTO_IP, IP_TOS, 1545 (void *)&on, sizeof(on)) == -1) { 1546 DWARN("setsockopt %s (ignored)", 1547 "IPTOS_THROUGHPUT"); 1548 } 1549 } 1550 #endif 1551 return (0); 1552 } 1553 1554 noport: 1555 data_addr = myctladdr; 1556 if (sendport) 1557 data_addr.su_port = 0; /* let system pick one */ 1558 if (data != -1) 1559 (void)close(data); 1560 data = socket(data_addr.su_family, SOCK_STREAM, 0); 1561 if (data < 0) { 1562 warn("Can't create socket for data connection"); 1563 if (tmpno) 1564 sendport = 1; 1565 return (1); 1566 } 1567 if (!sendport) 1568 if (setsockopt(data, SOL_SOCKET, SO_REUSEADDR, 1569 (void *)&on, sizeof(on)) == -1) { 1570 warn("Can't set SO_REUSEADDR on data connection"); 1571 goto bad; 1572 } 1573 if (bind(data, (struct sockaddr *)&data_addr.si_su, 1574 data_addr.su_len) < 0) { 1575 warn("Can't bind for data connection"); 1576 goto bad; 1577 } 1578 if ((options & SO_DEBUG) && 1579 setsockopt(data, SOL_SOCKET, SO_DEBUG, 1580 (void *)&on, sizeof(on)) == -1) { 1581 DWARN("setsockopt %s (ignored)", "SO_DEBUG"); 1582 } 1583 len = sizeof(data_addr.si_su); 1584 memset((char *)&data_addr, 0, sizeof (data_addr)); 1585 if (getsockname(data, (struct sockaddr *)&data_addr.si_su, &len) == -1) { 1586 warn("Can't determine my address of data connection"); 1587 goto bad; 1588 } 1589 data_addr.su_len = len; 1590 if (ftp_listen(data, 1) < 0) 1591 warn("Can't listen to data connection"); 1592 1593 if (sendport) { 1594 char hname[NI_MAXHOST], sname[NI_MAXSERV]; 1595 struct sockinet tmp; 1596 1597 switch (data_addr.su_family) { 1598 case AF_INET: 1599 if (!epsv4 || epsv4bad) { 1600 result = COMPLETE + 1; 1601 break; 1602 } 1603 #ifdef INET6 1604 /* FALLTHROUGH */ 1605 case AF_INET6: 1606 if (!epsv6 || epsv6bad) { 1607 result = COMPLETE + 1; 1608 break; 1609 } 1610 #endif 1611 af = (data_addr.su_family == AF_INET) ? 1 : 2; 1612 tmp = data_addr; 1613 #ifdef INET6 1614 if (tmp.su_family == AF_INET6) 1615 tmp.si_su.su_sin6.sin6_scope_id = 0; 1616 #endif 1617 if (getnameinfo((struct sockaddr *)&tmp.si_su, 1618 tmp.su_len, hname, sizeof(hname), sname, 1619 sizeof(sname), NI_NUMERICHOST | NI_NUMERICSERV)) { 1620 result = ERROR; 1621 } else { 1622 overbose = verbose; 1623 if (ftp_debug == 0) 1624 verbose = -1; 1625 result = command("EPRT |%u|%s|%s|", af, hname, 1626 sname); 1627 verbose = overbose; 1628 if (verbose > 0 && 1629 (result == COMPLETE || !connected)) 1630 fprintf(ttyout, "%s\n", reply_string); 1631 if (!connected) 1632 return (1); 1633 if (result != COMPLETE) { 1634 epsv4bad = 1; 1635 DPRINTF("disabling epsv4 for this " 1636 "connection\n"); 1637 } 1638 } 1639 break; 1640 default: 1641 result = COMPLETE + 1; 1642 break; 1643 } 1644 if (result == COMPLETE) 1645 goto skip_port; 1646 1647 switch (data_addr.su_family) { 1648 case AF_INET: 1649 a = (char *)&data_addr.si_su.su_sin.sin_addr; 1650 p = (char *)&data_addr.su_port; 1651 result = command("PORT %d,%d,%d,%d,%d,%d", 1652 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1653 UC(p[0]), UC(p[1])); 1654 break; 1655 #ifdef INET6 1656 case AF_INET6: { 1657 uint8_t ua[sizeof(data_addr.si_su.su_sin6.sin6_addr)]; 1658 uint8_t up[sizeof(data_addr.su_port)]; 1659 1660 memcpy(ua, &data_addr.si_su.su_sin6.sin6_addr, 1661 sizeof(ua)); 1662 memcpy(up, &data_addr.su_port, sizeof(up)); 1663 1664 result = command( 1665 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 1666 6, 16, 1667 ua[0], ua[1], ua[2], ua[3], 1668 ua[4], ua[5], ua[6], ua[7], 1669 ua[8], ua[9], ua[10], ua[11], 1670 ua[12], ua[13], ua[14], ua[15], 1671 2, 1672 up[0], up[1]); 1673 break; 1674 } 1675 #endif 1676 default: 1677 result = COMPLETE + 1; /* xxx */ 1678 } 1679 if (!connected) 1680 return (1); 1681 skip_port: 1682 1683 if (result == ERROR && sendport == -1) { 1684 sendport = 0; 1685 tmpno = 1; 1686 goto noport; 1687 } 1688 return (result != COMPLETE); 1689 } 1690 if (tmpno) 1691 sendport = 1; 1692 #ifdef IPTOS_THROUGHPUT 1693 if (data_addr.su_family == AF_INET) { 1694 on = IPTOS_THROUGHPUT; 1695 if (setsockopt(data, IPPROTO_IP, IP_TOS, 1696 (void *)&on, sizeof(on)) == -1) { 1697 DWARN("setsockopt %s (ignored)", "IPTOS_THROUGHPUT"); 1698 } 1699 } 1700 #endif 1701 return (0); 1702 bad: 1703 (void)close(data); 1704 data = -1; 1705 if (tmpno) 1706 sendport = 1; 1707 return (1); 1708 } 1709 1710 FILE * 1711 dataconn(const char *lmode) 1712 { 1713 struct sockinet from; 1714 int s, flags, rv, timeout; 1715 struct timeval endtime, now, td; 1716 struct pollfd pfd[1]; 1717 socklen_t fromlen; 1718 1719 if (passivemode) /* passive data connection */ 1720 return (fdopen(data, lmode)); 1721 1722 /* active mode data connection */ 1723 1724 if ((flags = fcntl(data, F_GETFL, 0)) == -1) 1725 goto dataconn_failed; /* get current socket flags */ 1726 if (fcntl(data, F_SETFL, flags | O_NONBLOCK) == -1) 1727 goto dataconn_failed; /* set non-blocking connect */ 1728 1729 /* NOTE: we now must restore socket flags on successful exit */ 1730 1731 /* limit time waiting on listening socket */ 1732 pfd[0].fd = data; 1733 pfd[0].events = POLLIN; 1734 (void)gettimeofday(&endtime, NULL); /* determine end time */ 1735 endtime.tv_sec += (quit_time > 0) ? quit_time: 60; 1736 /* without -q, default to 60s */ 1737 do { 1738 (void)gettimeofday(&now, NULL); 1739 timersub(&endtime, &now, &td); 1740 timeout = td.tv_sec * 1000 + td.tv_usec/1000; 1741 if (timeout < 0) 1742 timeout = 0; 1743 rv = ftp_poll(pfd, 1, timeout); 1744 } while (rv == -1 && errno == EINTR); /* loop until poll ! EINTR */ 1745 if (rv == -1) { 1746 warn("Can't poll waiting before accept"); 1747 goto dataconn_failed; 1748 } 1749 if (rv == 0) { 1750 warnx("Poll timeout waiting before accept"); 1751 goto dataconn_failed; 1752 } 1753 1754 /* (non-blocking) accept the connection */ 1755 fromlen = myctladdr.su_len; 1756 do { 1757 s = accept(data, (struct sockaddr *) &from.si_su, &fromlen); 1758 } while (s == -1 && errno == EINTR); /* loop until accept ! EINTR */ 1759 if (s == -1) { 1760 warn("Can't accept data connection"); 1761 goto dataconn_failed; 1762 } 1763 1764 (void)close(data); 1765 data = s; 1766 if (fcntl(data, F_SETFL, flags) == -1) /* restore socket flags */ 1767 goto dataconn_failed; 1768 1769 #ifdef IPTOS_THROUGHPUT 1770 if (from.su_family == AF_INET) { 1771 int tos = IPTOS_THROUGHPUT; 1772 if (setsockopt(s, IPPROTO_IP, IP_TOS, 1773 (void *)&tos, sizeof(tos)) == -1) { 1774 DWARN("setsockopt %s (ignored)", "IPTOS_THROUGHPUT"); 1775 } 1776 } 1777 #endif 1778 return (fdopen(data, lmode)); 1779 1780 dataconn_failed: 1781 (void)close(data); 1782 data = -1; 1783 return (NULL); 1784 } 1785 1786 void 1787 psabort(int notused) 1788 { 1789 int oerrno = errno; 1790 1791 sigint_raised = 1; 1792 alarmtimer(0); 1793 abrtflag++; 1794 errno = oerrno; 1795 } 1796 1797 void 1798 pswitch(int flag) 1799 { 1800 sigfunc oldintr; 1801 static struct comvars { 1802 int connect; 1803 char name[MAXHOSTNAMELEN]; 1804 struct sockinet mctl; 1805 struct sockinet hctl; 1806 FILE *in; 1807 FILE *out; 1808 int tpe; 1809 int curtpe; 1810 int cpnd; 1811 int sunqe; 1812 int runqe; 1813 int mcse; 1814 int ntflg; 1815 char nti[17]; 1816 char nto[17]; 1817 int mapflg; 1818 char mi[MAXPATHLEN]; 1819 char mo[MAXPATHLEN]; 1820 } proxstruct, tmpstruct; 1821 struct comvars *ip, *op; 1822 1823 abrtflag = 0; 1824 oldintr = xsignal(SIGINT, psabort); 1825 if (flag) { 1826 if (proxy) 1827 return; 1828 ip = &tmpstruct; 1829 op = &proxstruct; 1830 proxy++; 1831 } else { 1832 if (!proxy) 1833 return; 1834 ip = &proxstruct; 1835 op = &tmpstruct; 1836 proxy = 0; 1837 } 1838 ip->connect = connected; 1839 connected = op->connect; 1840 if (hostname) 1841 (void)strlcpy(ip->name, hostname, sizeof(ip->name)); 1842 else 1843 ip->name[0] = '\0'; 1844 hostname = op->name; 1845 ip->hctl = hisctladdr; 1846 hisctladdr = op->hctl; 1847 ip->mctl = myctladdr; 1848 myctladdr = op->mctl; 1849 ip->in = cin; 1850 cin = op->in; 1851 ip->out = cout; 1852 cout = op->out; 1853 ip->tpe = type; 1854 type = op->tpe; 1855 ip->curtpe = curtype; 1856 curtype = op->curtpe; 1857 ip->cpnd = cpend; 1858 cpend = op->cpnd; 1859 ip->sunqe = sunique; 1860 sunique = op->sunqe; 1861 ip->runqe = runique; 1862 runique = op->runqe; 1863 ip->mcse = mcase; 1864 mcase = op->mcse; 1865 ip->ntflg = ntflag; 1866 ntflag = op->ntflg; 1867 (void)strlcpy(ip->nti, ntin, sizeof(ip->nti)); 1868 (void)strlcpy(ntin, op->nti, sizeof(ntin)); 1869 (void)strlcpy(ip->nto, ntout, sizeof(ip->nto)); 1870 (void)strlcpy(ntout, op->nto, sizeof(ntout)); 1871 ip->mapflg = mapflag; 1872 mapflag = op->mapflg; 1873 (void)strlcpy(ip->mi, mapin, sizeof(ip->mi)); 1874 (void)strlcpy(mapin, op->mi, sizeof(mapin)); 1875 (void)strlcpy(ip->mo, mapout, sizeof(ip->mo)); 1876 (void)strlcpy(mapout, op->mo, sizeof(mapout)); 1877 (void)xsignal(SIGINT, oldintr); 1878 if (abrtflag) { 1879 abrtflag = 0; 1880 (*oldintr)(SIGINT); 1881 } 1882 } 1883 1884 __dead static void 1885 abortpt(int notused) 1886 { 1887 1888 sigint_raised = 1; 1889 alarmtimer(0); 1890 if (fromatty) 1891 write(fileno(ttyout), "\n", 1); 1892 ptabflg++; 1893 mflag = 0; 1894 abrtflag = 0; 1895 siglongjmp(ptabort, 1); 1896 } 1897 1898 void 1899 proxtrans(const char *cmd, const char *local, const char *remote) 1900 { 1901 sigfunc volatile oldintr; 1902 int prox_type, nfnd; 1903 int volatile secndflag; 1904 const char *volatile cmd2; 1905 1906 oldintr = SIG_ERR; 1907 secndflag = 0; 1908 if (strcmp(cmd, "RETR")) 1909 cmd2 = "RETR"; 1910 else 1911 cmd2 = runique ? "STOU" : "STOR"; 1912 if ((prox_type = type) == 0) { 1913 if (unix_server && unix_proxy) 1914 prox_type = TYPE_I; 1915 else 1916 prox_type = TYPE_A; 1917 } 1918 if (curtype != prox_type) 1919 changetype(prox_type, 1); 1920 if (command("PASV") != COMPLETE) { 1921 fputs("proxy server does not support third party transfers.\n", 1922 ttyout); 1923 return; 1924 } 1925 pswitch(0); 1926 if (!connected) { 1927 fputs("No primary connection.\n", ttyout); 1928 pswitch(1); 1929 code = -1; 1930 return; 1931 } 1932 if (curtype != prox_type) 1933 changetype(prox_type, 1); 1934 if (command("PORT %s", pasv) != COMPLETE) { 1935 pswitch(1); 1936 return; 1937 } 1938 if (sigsetjmp(ptabort, 1)) 1939 goto abort; 1940 oldintr = xsignal(SIGINT, abortpt); 1941 if ((restart_point && 1942 (command("REST " LLF, (LLT) restart_point) != CONTINUE)) 1943 || (command("%s %s", cmd, remote) != PRELIM)) { 1944 (void)xsignal(SIGINT, oldintr); 1945 pswitch(1); 1946 return; 1947 } 1948 sleep(2); 1949 pswitch(1); 1950 secndflag++; 1951 if ((restart_point && 1952 (command("REST " LLF, (LLT) restart_point) != CONTINUE)) 1953 || (command("%s %s", cmd2, local) != PRELIM)) 1954 goto abort; 1955 ptflag++; 1956 (void)getreply(0); 1957 pswitch(0); 1958 (void)getreply(0); 1959 (void)xsignal(SIGINT, oldintr); 1960 pswitch(1); 1961 ptflag = 0; 1962 fprintf(ttyout, "local: %s remote: %s\n", local, remote); 1963 return; 1964 abort: 1965 if (sigsetjmp(xferabort, 1)) { 1966 (void)xsignal(SIGINT, oldintr); 1967 return; 1968 } 1969 (void)xsignal(SIGINT, abort_squared); 1970 ptflag = 0; 1971 if (strcmp(cmd, "RETR") && !proxy) 1972 pswitch(1); 1973 else if (!strcmp(cmd, "RETR") && proxy) 1974 pswitch(0); 1975 if (!cpend && !secndflag) { /* only here if cmd = "STOR" (proxy=1) */ 1976 if (command("%s %s", cmd2, local) != PRELIM) { 1977 pswitch(0); 1978 if (cpend) 1979 abort_remote(NULL); 1980 } 1981 pswitch(1); 1982 if (ptabflg) 1983 code = -1; 1984 (void)xsignal(SIGINT, oldintr); 1985 return; 1986 } 1987 if (cpend) 1988 abort_remote(NULL); 1989 pswitch(!proxy); 1990 if (!cpend && !secndflag) { /* only if cmd = "RETR" (proxy=1) */ 1991 if (command("%s %s", cmd2, local) != PRELIM) { 1992 pswitch(0); 1993 if (cpend) 1994 abort_remote(NULL); 1995 pswitch(1); 1996 if (ptabflg) 1997 code = -1; 1998 (void)xsignal(SIGINT, oldintr); 1999 return; 2000 } 2001 } 2002 if (cpend) 2003 abort_remote(NULL); 2004 pswitch(!proxy); 2005 if (cpend) { 2006 if ((nfnd = empty(cin, NULL, 10)) <= 0) { 2007 if (nfnd < 0) 2008 warn("Error aborting proxy command"); 2009 if (ptabflg) 2010 code = -1; 2011 lostpeer(0); 2012 } 2013 (void)getreply(0); 2014 (void)getreply(0); 2015 } 2016 if (proxy) 2017 pswitch(0); 2018 pswitch(1); 2019 if (ptabflg) 2020 code = -1; 2021 (void)xsignal(SIGINT, oldintr); 2022 } 2023 2024 void 2025 reset(int argc, char *argv[]) 2026 { 2027 int nfnd = 1; 2028 2029 if (argc == 0 && argv != NULL) { 2030 UPRINTF("usage: %s\n", argv[0]); 2031 code = -1; 2032 return; 2033 } 2034 while (nfnd > 0) { 2035 if ((nfnd = empty(cin, NULL, 0)) < 0) { 2036 warn("Error resetting connection"); 2037 code = -1; 2038 lostpeer(0); 2039 } else if (nfnd) 2040 (void)getreply(0); 2041 } 2042 } 2043 2044 char * 2045 gunique(const char *local) 2046 { 2047 static char new[MAXPATHLEN]; 2048 char *cp = strrchr(local, '/'); 2049 int d, count=0, len; 2050 char ext = '1'; 2051 2052 if (cp) 2053 *cp = '\0'; 2054 d = access(cp == local ? "/" : cp ? local : ".", W_OK); 2055 if (cp) 2056 *cp = '/'; 2057 if (d < 0) { 2058 warn("Can't access `%s'", local); 2059 return (NULL); 2060 } 2061 len = strlcpy(new, local, sizeof(new)); 2062 cp = &new[len]; 2063 *cp++ = '.'; 2064 while (!d) { 2065 if (++count == 100) { 2066 fputs("runique: can't find unique file name.\n", 2067 ttyout); 2068 return (NULL); 2069 } 2070 *cp++ = ext; 2071 *cp = '\0'; 2072 if (ext == '9') 2073 ext = '0'; 2074 else 2075 ext++; 2076 if ((d = access(new, F_OK)) < 0) 2077 break; 2078 if (ext != '0') 2079 cp--; 2080 else if (*(cp - 2) == '.') 2081 *(cp - 1) = '1'; 2082 else { 2083 *(cp - 2) = *(cp - 2) + 1; 2084 cp--; 2085 } 2086 } 2087 return (new); 2088 } 2089 2090 /* 2091 * abort_squared -- 2092 * aborts abort_remote(). lostpeer() is called because if the user is 2093 * too impatient to wait or there's another problem then ftp really 2094 * needs to get back to a known state. 2095 */ 2096 static void 2097 abort_squared(int signo) 2098 { 2099 char msgbuf[100]; 2100 size_t len; 2101 2102 sigint_raised = 1; 2103 alarmtimer(0); 2104 len = strlcpy(msgbuf, "\nremote abort aborted; closing connection.\n", 2105 sizeof(msgbuf)); 2106 write(fileno(ttyout), msgbuf, len); 2107 lostpeer(signo); 2108 siglongjmp(xferabort, 1); 2109 } 2110 2111 void 2112 abort_remote(FILE *din) 2113 { 2114 unsigned char buf[BUFSIZ]; 2115 int nfnd; 2116 2117 if (cout == NULL) { 2118 warnx("Lost control connection for abort"); 2119 if (ptabflg) 2120 code = -1; 2121 lostpeer(0); 2122 return; 2123 } 2124 /* 2125 * send IAC in urgent mode instead of DM because 4.3BSD places oob mark 2126 * after urgent byte rather than before as is protocol now 2127 */ 2128 buf[0] = IAC; 2129 buf[1] = IP; 2130 buf[2] = IAC; 2131 if (send(fileno(cout), buf, 3, MSG_OOB) != 3) 2132 warn("Can't send abort message"); 2133 fprintf(cout, "%cABOR\r\n", DM); 2134 (void)fflush(cout); 2135 if ((nfnd = empty(cin, din, 10)) <= 0) { 2136 if (nfnd < 0) 2137 warn("Can't send abort message"); 2138 if (ptabflg) 2139 code = -1; 2140 lostpeer(0); 2141 } 2142 if (din && (nfnd & 2)) { 2143 while (read(fileno(din), buf, BUFSIZ) > 0) 2144 continue; 2145 } 2146 if (getreply(0) == ERROR && code == 552) { 2147 /* 552 needed for nic style abort */ 2148 (void)getreply(0); 2149 } 2150 (void)getreply(0); 2151 } 2152 2153 /* 2154 * Ensure that ai->ai_addr is NOT an IPv4 mapped address. 2155 * IPv4 mapped address complicates too many things in FTP 2156 * protocol handling, as FTP protocol is defined differently 2157 * between IPv4 and IPv6. 2158 * 2159 * This may not be the best way to handle this situation, 2160 * since the semantics of IPv4 mapped address is defined in 2161 * the kernel. There are configurations where we should use 2162 * IPv4 mapped address as native IPv6 address, not as 2163 * "an IPv6 address that embeds IPv4 address" (namely, SIIT). 2164 * 2165 * More complete solution would be to have an additional 2166 * getsockopt to grab "real" peername/sockname. "real" 2167 * peername/sockname will be AF_INET if IPv4 mapped address 2168 * is used to embed IPv4 address, and will be AF_INET6 if 2169 * we use it as native. What a mess! 2170 */ 2171 void 2172 ai_unmapped(struct addrinfo *ai) 2173 { 2174 #ifdef INET6 2175 struct sockaddr_in6 *sin6; 2176 struct sockaddr_in sin; 2177 socklen_t len; 2178 2179 if (ai->ai_family != AF_INET6) 2180 return; 2181 if (ai->ai_addrlen != sizeof(struct sockaddr_in6) || 2182 sizeof(sin) > ai->ai_addrlen) 2183 return; 2184 sin6 = (struct sockaddr_in6 *)ai->ai_addr; 2185 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 2186 return; 2187 2188 memset(&sin, 0, sizeof(sin)); 2189 sin.sin_family = AF_INET; 2190 len = sizeof(struct sockaddr_in); 2191 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 2192 sizeof(sin.sin_addr)); 2193 sin.sin_port = sin6->sin6_port; 2194 2195 ai->ai_family = AF_INET; 2196 #if defined(HAVE_STRUCT_SOCKADDR_IN_SIN_LEN) 2197 sin.sin_len = len; 2198 #endif 2199 memcpy(ai->ai_addr, &sin, len); 2200 ai->ai_addrlen = len; 2201 #endif 2202 } 2203 2204 #ifdef NO_USAGE 2205 void 2206 xusage(void) 2207 { 2208 fputs("Usage error\n", ttyout); 2209 } 2210 #endif 2211