1/* $NetBSD: ftp.c,v 1.176 2024/02/18 22:29:56 christos Exp $ */ 2 3/*- 4 * Copyright (c) 1996-2021 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32/* 33 * Copyright (c) 1985, 1989, 1993, 1994 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 */ 60 61/* 62 * Copyright (C) 1997 and 1998 WIDE Project. 63 * All rights reserved. 64 * 65 * Redistribution and use in source and binary forms, with or without 66 * modification, are permitted provided that the following conditions 67 * are met: 68 * 1. Redistributions of source code must retain the above copyright 69 * notice, this list of conditions and the following disclaimer. 70 * 2. Redistributions in binary form must reproduce the above copyright 71 * notice, this list of conditions and the following disclaimer in the 72 * documentation and/or other materials provided with the distribution. 73 * 3. Neither the name of the project nor the names of its contributors 74 * may be used to endorse or promote products derived from this software 75 * without specific prior written permission. 76 * 77 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 78 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 79 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 80 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 81 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 82 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 83 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 84 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 85 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 86 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 87 * SUCH DAMAGE. 88 */ 89 90#include <sys/cdefs.h> 91#ifndef lint 92#if 0 93static char sccsid[] = "@(#)ftp.c 8.6 (Berkeley) 10/27/94"; 94#else 95__RCSID("$NetBSD: ftp.c,v 1.176 2024/02/18 22:29:56 christos Exp $"); 96#endif 97#endif /* not lint */ 98 99#include <sys/types.h> 100#include <sys/stat.h> 101#include <sys/socket.h> 102#include <sys/time.h> 103 104#include <netinet/in.h> 105#include <netinet/in_systm.h> 106#include <netinet/ip.h> 107#include <arpa/inet.h> 108#include <arpa/ftp.h> 109#include <arpa/telnet.h> 110 111#include <assert.h> 112#include <ctype.h> 113#include <err.h> 114#include <errno.h> 115#include <fcntl.h> 116#include <netdb.h> 117#include <stdio.h> 118#include <stdlib.h> 119#include <string.h> 120#include <time.h> 121#include <unistd.h> 122#include <stdarg.h> 123 124#include "ftp_var.h" 125 126volatile sig_atomic_t abrtflag; 127volatile sig_atomic_t timeoutflag; 128 129sigjmp_buf ptabort; 130int ptabflg; 131int ptflag = 0; 132char pasv[BUFSIZ]; /* passive port for proxy data connection */ 133size_t ftp_buflen = FTPBUFLEN; 134 135static int empty(FILE *, FILE *, int); 136__dead static void abort_squared(int); 137 138struct sockinet { 139 union sockunion { 140 struct sockaddr_in su_sin; 141#ifdef INET6 142 struct sockaddr_in6 su_sin6; 143#endif 144 } si_su; 145#if !defined(HAVE_STRUCT_SOCKADDR_IN_SIN_LEN) 146 int si_len; 147#endif 148}; 149 150#if !defined(HAVE_STRUCT_SOCKADDR_IN_SIN_LEN) 151# define su_len si_len 152#else 153# define su_len si_su.su_sin.sin_len 154#endif 155#define su_family si_su.su_sin.sin_family 156#define su_port si_su.su_sin.sin_port 157 158struct sockinet myctladdr, hisctladdr, data_addr; 159 160char * 161hookup(const char *host, const char *port) 162{ 163 int s = -1, error; 164 struct addrinfo hints, *res, *res0; 165 static char hostnamebuf[MAXHOSTNAMELEN]; 166 socklen_t len; 167 int on = 1; 168 169 memset((char *)&hisctladdr, 0, sizeof (hisctladdr)); 170 memset((char *)&myctladdr, 0, sizeof (myctladdr)); 171 memset(&hints, 0, sizeof(hints)); 172 hints.ai_flags = AI_CANONNAME; 173 hints.ai_family = family; 174 hints.ai_socktype = SOCK_STREAM; 175 hints.ai_protocol = 0; 176 error = getaddrinfo(host, port, &hints, &res0); 177 if (error) { 178 warnx("Can't lookup `%s:%s': %s", host, port, 179 (error == EAI_SYSTEM) ? strerror(errno) 180 : gai_strerror(error)); 181 code = -1; 182 return (0); 183 } 184 185 if (res0->ai_canonname) 186 (void)strlcpy(hostnamebuf, res0->ai_canonname, 187 sizeof(hostnamebuf)); 188 else 189 (void)strlcpy(hostnamebuf, host, sizeof(hostnamebuf)); 190 hostname = hostnamebuf; 191 192 for (res = res0; res; res = res->ai_next) { 193 char hname[NI_MAXHOST], sname[NI_MAXSERV]; 194 195 ai_unmapped(res); 196 if (getnameinfo(res->ai_addr, res->ai_addrlen, 197 hname, sizeof(hname), sname, sizeof(sname), 198 NI_NUMERICHOST | NI_NUMERICSERV) != 0) { 199 strlcpy(hname, "?", sizeof(hname)); 200 strlcpy(sname, "?", sizeof(sname)); 201 } 202 if (verbose && res0->ai_next) { 203 /* if we have multiple possibilities */ 204#ifdef INET6 205 if(res->ai_family == AF_INET6) { 206 fprintf(ttyout, "Trying [%s]:%s ...\n", hname, 207 sname); 208 } else { 209#endif 210 fprintf(ttyout, "Trying %s:%s ...\n", hname, 211 sname); 212#ifdef INET6 213 } 214#endif 215 } 216 s = socket(res->ai_family, SOCK_STREAM, res->ai_protocol); 217 if (s < 0) { 218 warn("Can't create socket for connection to `%s:%s'", 219 hname, sname); 220 continue; 221 } 222 if (ftp_connect(s, res->ai_addr, res->ai_addrlen, 223 verbose || !res->ai_next) < 0) { 224 close(s); 225 s = -1; 226 continue; 227 } 228 229 /* finally we got one */ 230 break; 231 } 232 if (s < 0) { 233 warnx("Can't connect to `%s:%s'", host, port); 234 code = -1; 235 freeaddrinfo(res0); 236 return 0; 237 } 238 memcpy(&hisctladdr.si_su, res->ai_addr, res->ai_addrlen); 239 hisctladdr.su_len = res->ai_addrlen; 240 freeaddrinfo(res0); 241 res0 = res = NULL; 242 243 len = hisctladdr.su_len; 244 if (getsockname(s, (struct sockaddr *)&myctladdr.si_su, &len) == -1) { 245 warn("Can't determine my address of connection to `%s:%s'", 246 host, port); 247 code = -1; 248 goto bad; 249 } 250 myctladdr.su_len = len; 251 252#ifdef IPTOS_LOWDELAY 253 if (hisctladdr.su_family == AF_INET) { 254 int tos = IPTOS_LOWDELAY; 255 if (setsockopt(s, IPPROTO_IP, IP_TOS, 256 (void *)&tos, sizeof(tos)) == -1) { 257 DWARN("setsockopt %s (ignored)", 258 "IPTOS_LOWDELAY"); 259 } 260 } 261#endif 262 cin = fdopen(s, "r"); 263 cout = fdopen(s, "w"); 264 if (cin == NULL || cout == NULL) { 265 warnx("Can't fdopen socket"); 266 if (cin) 267 (void)fclose(cin); 268 if (cout) 269 (void)fclose(cout); 270 code = -1; 271 goto bad; 272 } 273 if (verbose) 274 fprintf(ttyout, "Connected to %s.\n", hostname); 275 if (getreply(0) > 2) { /* read startup message from server */ 276 if (cin) 277 (void)fclose(cin); 278 if (cout) 279 (void)fclose(cout); 280 code = -1; 281 goto bad; 282 } 283 284 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 285 (void *)&on, sizeof(on)) == -1) { 286 DWARN("setsockopt %s (ignored)", "SO_KEEPALIVE"); 287 } 288 289 if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, 290 (void *)&on, sizeof(on)) == -1) { 291 DWARN("setsockopt %s (ignored)", "SO_OOBINLINE"); 292 } 293 294 return (hostname); 295 bad: 296 (void)close(s); 297 return (NULL); 298} 299 300void 301cmdabort(int notused) 302{ 303 int oerrno = errno; 304 305 sigint_raised = 1; 306 alarmtimer(0); 307 if (fromatty) 308 write(fileno(ttyout), "\n", 1); 309 abrtflag++; 310 if (ptflag) 311 siglongjmp(ptabort, 1); 312 errno = oerrno; 313} 314 315void 316cmdtimeout(int notused) 317{ 318 int oerrno = errno; 319 320 alarmtimer(0); 321 if (fromatty) 322 write(fileno(ttyout), "\n", 1); 323 timeoutflag++; 324 if (ptflag) 325 siglongjmp(ptabort, 1); 326 errno = oerrno; 327} 328 329static int 330issighandler(sigfunc func) 331{ 332 return (func != SIG_IGN && 333 func != SIG_DFL && 334#ifdef SIG_HOLD 335 func != SIG_HOLD && 336#endif 337 func != SIG_ERR); 338} 339 340/*VARARGS*/ 341int 342command(const char *fmt, ...) 343{ 344 va_list ap; 345 int r; 346 sigfunc oldsigint; 347 348#ifndef NO_DEBUG 349 if (ftp_debug) { 350 fputs("---> ", ttyout); 351 va_start(ap, fmt); 352 if (strncmp("PASS ", fmt, 5) == 0) 353 fputs("PASS XXXX", ttyout); 354 else if (strncmp("ACCT ", fmt, 5) == 0) 355 fputs("ACCT XXXX", ttyout); 356 else 357 vfprintf(ttyout, fmt, ap); 358 va_end(ap); 359 putc('\n', ttyout); 360 } 361#endif 362 if (cout == NULL) { 363 warnx("No control connection for command"); 364 code = -1; 365 return (0); 366 } 367 368 abrtflag = 0; 369 370 oldsigint = xsignal(SIGINT, cmdabort); 371 372 va_start(ap, fmt); 373 vfprintf(cout, fmt, ap); 374 va_end(ap); 375 fputs("\r\n", cout); 376 (void)fflush(cout); 377 cpend = 1; 378 r = getreply(!strcmp(fmt, "QUIT")); 379 if (abrtflag && issighandler(oldsigint)) { 380 (*oldsigint)(SIGINT); 381 } 382 (void)xsignal(SIGINT, oldsigint); 383 return (r); 384} 385 386static const char *m421[] = { 387 "remote server timed out. Connection closed", 388 "user interrupt. Connection closed", 389 "remote server has closed connection", 390}; 391 392int 393getreply(int expecteof) 394{ 395 char current_line[BUFSIZ]; /* last line of previous reply */ 396 int c, n, lineno; 397 int dig; 398 int originalcode = 0, continuation = 0; 399 sigfunc oldsigint, oldsigalrm; 400 int pflag = 0; 401 char *cp, *pt = pasv; 402 403 abrtflag = 0; 404 timeoutflag = 0; 405 406 oldsigint = xsignal(SIGINT, cmdabort); 407 oldsigalrm = xsignal(SIGALRM, cmdtimeout); 408 409 for (lineno = 0 ;; lineno++) { 410 dig = n = code = 0; 411 cp = current_line; 412 while (alarmtimer(quit_time ? quit_time : 60), 413 ((c = getc(cin)) != '\n')) { 414 if (c == IAC) { /* handle telnet commands */ 415 switch (c = getc(cin)) { 416 case WILL: 417 case WONT: 418 c = getc(cin); 419 fprintf(cout, "%c%c%c", IAC, DONT, c); 420 (void)fflush(cout); 421 break; 422 case DO: 423 case DONT: 424 c = getc(cin); 425 fprintf(cout, "%c%c%c", IAC, WONT, c); 426 (void)fflush(cout); 427 break; 428 default: 429 break; 430 } 431 continue; 432 } 433 dig++; 434 if (c == EOF) { 435 /* 436 * these will get trashed by pswitch() 437 * in lostpeer() 438 */ 439 int reply_timeoutflag = timeoutflag; 440 int reply_abrtflag = abrtflag; 441 442 alarmtimer(0); 443 if (expecteof && feof(cin)) { 444 (void)xsignal(SIGINT, oldsigint); 445 (void)xsignal(SIGALRM, oldsigalrm); 446 code = 221; 447 return (0); 448 } 449 cpend = 0; 450 lostpeer(0); 451 if (verbose) { 452 size_t midx; 453 if (reply_timeoutflag) 454 midx = 0; 455 else if (reply_abrtflag) 456 midx = 1; 457 else 458 midx = 2; 459 (void)fprintf(ttyout, 460 "421 Service not available, %s.\n", m421[midx]); 461 (void)fflush(ttyout); 462 } 463 code = 421; 464 (void)xsignal(SIGINT, oldsigint); 465 (void)xsignal(SIGALRM, oldsigalrm); 466 return (4); 467 } 468 if (c != '\r' && (verbose > 0 || 469 ((verbose > -1 && n == '5' && dig > 4) && 470 (((!n && c < '5') || (n && n < '5')) 471 || !retry_connect)))) { 472 if (proxflag && 473 (dig == 1 || (dig == 5 && verbose == 0))) 474 fprintf(ttyout, "%s:", hostname); 475 (void)putc(c, ttyout); 476 } 477 if (dig < 4 && isdigit(c)) 478 code = code * 10 + (c - '0'); 479 if (!pflag && (code == 227 || code == 228)) 480 pflag = 1; 481 else if (!pflag && code == 229) 482 pflag = 100; 483 if (dig > 4 && pflag == 1 && isdigit(c)) 484 pflag = 2; 485 if (pflag == 2) { 486 if (c != '\r' && c != ')') { 487 if (pt < &pasv[sizeof(pasv) - 1]) 488 *pt++ = c; 489 } else { 490 *pt = '\0'; 491 pflag = 3; 492 } 493 } 494 if (pflag == 100 && c == '(') 495 pflag = 2; 496 if (dig == 4 && c == '-') { 497 if (continuation) 498 code = 0; 499 continuation++; 500 } 501 if (n == 0) 502 n = c; 503 if (cp < ¤t_line[sizeof(current_line) - 1]) 504 *cp++ = c; 505 } 506 if (verbose > 0 || ((verbose > -1 && n == '5') && 507 (n < '5' || !retry_connect))) { 508 (void)putc(c, ttyout); 509 (void)fflush(ttyout); 510 } 511 if (cp[-1] == '\r') 512 cp[-1] = '\0'; 513 *cp = '\0'; 514 if (lineno == 0) 515 (void)strlcpy(reply_string, current_line, 516 sizeof(reply_string)); 517 if (lineno > 0 && code == 0 && reply_callback != NULL) 518 (*reply_callback)(current_line); 519 if (continuation && code != originalcode) { 520 if (originalcode == 0) 521 originalcode = code; 522 continue; 523 } 524 if (n != '1') 525 cpend = 0; 526 alarmtimer(0); 527 (void)xsignal(SIGINT, oldsigint); 528 (void)xsignal(SIGALRM, oldsigalrm); 529 if (code == 421 || originalcode == 421) 530 lostpeer(0); 531 if (abrtflag && oldsigint != cmdabort && 532 issighandler(oldsigint)) { 533 (*oldsigint)(SIGINT); 534 } 535 if (timeoutflag && oldsigalrm != cmdtimeout && 536 issighandler(oldsigalrm)) { 537 (*oldsigalrm)(SIGINT); 538 } 539 return (n - '0'); 540 } 541} 542 543static int 544empty(FILE *ecin, FILE *din, int sec) 545{ 546 int nr, nfd; 547 struct pollfd pfd[2]; 548 549 nfd = 0; 550 if (ecin) { 551 pfd[nfd].fd = fileno(ecin); 552 pfd[nfd++].events = POLLIN; 553 } 554 555 if (din) { 556 pfd[nfd].fd = fileno(din); 557 pfd[nfd++].events = POLLIN; 558 } 559 560 if ((nr = ftp_poll(pfd, nfd, sec * 1000)) <= 0) 561 return nr; 562 563 nr = 0; 564 nfd = 0; 565 if (ecin) 566 nr |= (pfd[nfd++].revents & POLLIN) ? 1 : 0; 567 if (din) 568 nr |= (pfd[nfd++].revents & POLLIN) ? 2 : 0; 569 return nr; 570} 571 572sigjmp_buf xferabort; 573 574__dead static void 575abortxfer(int notused) 576{ 577 char msgbuf[100]; 578 size_t len; 579 580 sigint_raised = 1; 581 alarmtimer(0); 582 mflag = 0; 583 abrtflag = 0; 584 switch (direction[0]) { 585 case 'r': 586 strlcpy(msgbuf, "\nreceive", sizeof(msgbuf)); 587 break; 588 case 's': 589 strlcpy(msgbuf, "\nsend", sizeof(msgbuf)); 590 break; 591 default: 592 errx(1, "abortxfer: unknown direction `%s'", direction); 593 } 594 len = strlcat(msgbuf, " aborted. Waiting for remote to finish abort.\n", 595 sizeof(msgbuf)); 596 write(fileno(ttyout), msgbuf, len); 597 siglongjmp(xferabort, 1); 598} 599 600/* 601 * Read data from infd & write to outfd, using buf/bufsize as the temporary 602 * buffer, dealing with short reads or writes. 603 * If rate_limit != 0, rate-limit the transfer. 604 * If hash_interval != 0, fputc('c', ttyout) every hash_interval bytes. 605 * Updates global variables: bytes. 606 * Returns 0 if ok, 1 if there was a read error, 2 if there was a write error. 607 * In the case of error, errno contains the appropriate error code. 608 */ 609static int 610copy_bytes(int infd, int outfd, char *buf, size_t bufsize, 611 int rate_limit, int hash_interval) 612{ 613 volatile off_t hashc; 614 ssize_t inc, outc; 615 char *bufp; 616 struct timeval tvthen, tvnow, tvdiff; 617 off_t bufrem, bufchunk; 618 int serr; 619 620 hashc = hash_interval; 621 if (rate_limit) 622 bufchunk = rate_limit; 623 else 624 bufchunk = bufsize; 625 626 while (1) { 627 if (rate_limit) { 628 (void)gettimeofday(&tvthen, NULL); 629 } 630 errno = 0; 631 inc = outc = 0; 632 /* copy bufchunk at a time */ 633 bufrem = bufchunk; 634 while (bufrem > 0) { 635 inc = read(infd, buf, MIN((off_t)bufsize, bufrem)); 636 if (inc < 0) { 637 if (errno == EINTR || errno == EAGAIN) { 638 continue; 639 } 640 goto copy_done; 641 } else if (inc == 0) { 642 goto copy_done; 643 } 644 bytes += inc; 645 bufrem -= inc; 646 bufp = buf; 647 while (inc > 0) { 648 outc = write(outfd, bufp, inc); 649 if (outc < 0) { 650 if (errno == EINTR || errno == EAGAIN) { 651 continue; 652 } 653 goto copy_done; 654 } 655 inc -= outc; 656 bufp += outc; 657 } 658 if (hash_interval) { 659 while (bytes >= hashc) { 660 (void)putc('#', ttyout); 661 hashc += hash_interval; 662 } 663 (void)fflush(ttyout); 664 } 665 } 666 if (rate_limit) { /* rate limited; wait if necessary */ 667 while (1) { 668 (void)gettimeofday(&tvnow, NULL); 669 timersub(&tvnow, &tvthen, &tvdiff); 670 if (tvdiff.tv_sec > 0) 671 break; 672 usleep(1000000 - tvdiff.tv_usec); 673 } 674 } 675 } 676 677 copy_done: 678 serr = errno; 679 if (hash_interval && bytes > 0) { 680 if (bytes < hash_interval) 681 (void)putc('#', ttyout); 682 (void)putc('\n', ttyout); 683 (void)fflush(ttyout); 684 } 685 errno = serr; 686 if (inc == -1) 687 return 1; 688 if (outc == -1) 689 return 2; 690 691 return 0; 692} 693 694void 695sendrequest(const char *cmd, const char *local, const char *remote, 696 int printnames) 697{ 698 struct stat st; 699 int c; 700 FILE *volatile fin; 701 FILE *volatile dout; 702 int (*volatile closefunc)(FILE *); 703 sigfunc volatile oldintr; 704 sigfunc volatile oldpipe; 705 off_t volatile hashbytes; 706 int hash_interval; 707 const char *lmode; 708 static size_t bufsize; 709 static char *buf; 710 int oprogress; 711 712 hashbytes = mark; 713 direction = "sent"; 714 dout = NULL; 715 bytes = 0; 716 filesize = -1; 717 oprogress = progress; 718 if (verbose && printnames) { 719 if (*local != '-') 720 fprintf(ttyout, "local: %s ", local); 721 if (remote) 722 fprintf(ttyout, "remote: %s\n", remote); 723 } 724 if (proxy) { 725 proxtrans(cmd, local, remote); 726 return; 727 } 728 if (curtype != type) 729 changetype(type, 0); 730 closefunc = NULL; 731 oldintr = SIG_ERR; 732 oldpipe = SIG_ERR; 733 lmode = "w"; 734 if (sigsetjmp(xferabort, 1)) { 735 while (cpend) 736 (void)getreply(0); 737 code = -1; 738 goto cleanupsend; 739 } 740 (void)xsignal(SIGQUIT, psummary); 741 oldintr = xsignal(SIGINT, abortxfer); 742 if (strcmp(local, "-") == 0) { 743 fin = stdin; 744 progress = 0; 745 } else if (*local == '|') { 746 oldpipe = xsignal(SIGPIPE, SIG_IGN); 747 fin = popen(local + 1, "r"); 748 if (fin == NULL) { 749 warn("Can't execute `%s'", local + 1); 750 code = -1; 751 goto cleanupsend; 752 } 753 progress = 0; 754 closefunc = pclose; 755 } else { 756 fin = fopen(local, "r"); 757 if (fin == NULL) { 758 warn("Can't open `%s'", local); 759 code = -1; 760 goto cleanupsend; 761 } 762 closefunc = fclose; 763 if (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode)) { 764 fprintf(ttyout, "%s: not a plain file.\n", local); 765 code = -1; 766 goto cleanupsend; 767 } 768 filesize = st.st_size; 769 } 770 if (initconn()) { 771 code = -1; 772 goto cleanupsend; 773 } 774 if (sigsetjmp(xferabort, 1)) 775 goto abort; 776 777 if (restart_point && 778 (strcmp(cmd, "STOR") == 0 || strcmp(cmd, "APPE") == 0)) { 779 int rc; 780 781 rc = -1; 782 switch (curtype) { 783 case TYPE_A: 784 rc = fseeko(fin, restart_point, SEEK_SET); 785 break; 786 case TYPE_I: 787 case TYPE_L: 788 rc = lseek(fileno(fin), restart_point, SEEK_SET); 789 break; 790 } 791 if (rc < 0) { 792 warn("Can't seek to restart `%s'", local); 793 goto cleanupsend; 794 } 795 if (command("REST " LLF, (LLT)restart_point) != CONTINUE) 796 goto cleanupsend; 797 lmode = "r+"; 798 } 799 if (remote) { 800 if (command("%s %s", cmd, remote) != PRELIM) 801 goto cleanupsend; 802 } else { 803 if (command("%s", cmd) != PRELIM) 804 goto cleanupsend; 805 } 806 dirchange = 1; 807 dout = dataconn(lmode); 808 if (dout == NULL) 809 goto abort; 810 811 assert(sndbuf_size > 0); 812 if ((size_t)sndbuf_size > bufsize) { 813 if (buf) 814 (void)free(buf); 815 bufsize = sndbuf_size; 816 buf = ftp_malloc(bufsize); 817 } 818 819 progressmeter(-1); 820 if (oldpipe == SIG_ERR) { 821 oldpipe = xsignal(SIGPIPE, SIG_IGN); 822 } 823 hash_interval = (hash && (!progress || filesize < 0)) ? mark : 0; 824 825 switch (curtype) { 826 827 case TYPE_I: 828 case TYPE_L: 829 c = copy_bytes(fileno(fin), fileno(dout), buf, bufsize, 830 rate_put, hash_interval); 831 if (c == 1) { 832 warn("Reading `%s'", local); 833 } else if (c == 2) { 834 if (errno != EPIPE) 835 warn("Writing to network"); 836 bytes = -1; 837 } 838 break; 839 840 case TYPE_A: 841 while ((c = getc(fin)) != EOF) { 842 if (c == '\n') { 843 while (hash_interval && bytes >= hashbytes) { 844 (void)putc('#', ttyout); 845 (void)fflush(ttyout); 846 hashbytes += mark; 847 } 848 if (ferror(dout)) 849 break; 850 (void)putc('\r', dout); 851 bytes++; 852 } 853 (void)putc(c, dout); 854 bytes++; 855#if 0 /* this violates RFC 959 */ 856 if (c == '\r') { 857 (void)putc('\0', dout); 858 bytes++; 859 } 860#endif 861 } 862 if (hash_interval) { 863 if (bytes < hashbytes) 864 (void)putc('#', ttyout); 865 (void)putc('\n', ttyout); 866 } 867 if (ferror(fin)) 868 warn("Reading `%s'", local); 869 if (ferror(dout)) { 870 if (errno != EPIPE) 871 warn("Writing to network"); 872 bytes = -1; 873 } 874 break; 875 } 876 877 progressmeter(1); 878 if (closefunc != NULL) { 879 (*closefunc)(fin); 880 fin = NULL; 881 } 882 (void)fclose(dout); 883 dout = NULL; 884 (void)getreply(0); 885 if (bytes > 0) 886 ptransfer(0); 887 goto cleanupsend; 888 889 abort: 890 (void)xsignal(SIGINT, oldintr); 891 oldintr = SIG_ERR; 892 if (!cpend) { 893 code = -1; 894 goto cleanupsend; 895 } 896 if (data >= 0) { 897 (void)close(data); 898 data = -1; 899 } 900 if (dout) { 901 (void)fclose(dout); 902 dout = NULL; 903 } 904 (void)getreply(0); 905 code = -1; 906 if (bytes > 0) 907 ptransfer(0); 908 909 cleanupsend: 910 if (oldintr != SIG_ERR) 911 (void)xsignal(SIGINT, oldintr); 912 if (oldpipe != SIG_ERR) 913 (void)xsignal(SIGPIPE, oldpipe); 914 if (data >= 0) { 915 (void)close(data); 916 data = -1; 917 } 918 if (closefunc != NULL && fin != NULL) 919 (*closefunc)(fin); 920 if (dout) 921 (void)fclose(dout); 922 progress = oprogress; 923 restart_point = 0; 924 bytes = 0; 925} 926 927void 928recvrequest(const char *cmd, const char *volatile local, const char *remote, 929 const char *lmode, int printnames, int ignorespecial) 930{ 931 FILE *volatile fout; 932 FILE *volatile din; 933 int (*volatile closefunc)(FILE *); 934 sigfunc volatile oldintr; 935 sigfunc volatile oldpipe; 936 int c, d; 937 int volatile is_retr; 938 int volatile tcrflag; 939 int volatile bare_lfs; 940 static size_t bufsize; 941 static char *buf; 942 off_t volatile hashbytes; 943 int hash_interval; 944 struct stat st; 945 time_t mtime; 946 struct timeval tval[2]; 947 int oprogress; 948 int opreserve; 949 950 fout = NULL; 951 din = NULL; 952 hashbytes = mark; 953 direction = "received"; 954 bytes = 0; 955 bare_lfs = 0; 956 filesize = -1; 957 oprogress = progress; 958 opreserve = preserve; 959 is_retr = (strcmp(cmd, "RETR") == 0); 960 if (is_retr && verbose && printnames) { 961 if (ignorespecial || *local != '-') 962 fprintf(ttyout, "local: %s ", local); 963 if (remote) 964 fprintf(ttyout, "remote: %s\n", remote); 965 } 966 if (proxy && is_retr) { 967 proxtrans(cmd, local, remote); 968 return; 969 } 970 closefunc = NULL; 971 oldintr = SIG_ERR; 972 oldpipe = SIG_ERR; 973 tcrflag = !crflag && is_retr; 974 if (sigsetjmp(xferabort, 1)) { 975 while (cpend) 976 (void)getreply(0); 977 code = -1; 978 goto cleanuprecv; 979 } 980 (void)xsignal(SIGQUIT, psummary); 981 oldintr = xsignal(SIGINT, abortxfer); 982 if (ignorespecial || (strcmp(local, "-") && *local != '|')) { 983 if (access(local, W_OK) < 0) { 984 char *dir = strrchr(local, '/'); 985 986 if (errno != ENOENT && errno != EACCES) { 987 warn("Can't access `%s'", local); 988 code = -1; 989 goto cleanuprecv; 990 } 991 if (dir != NULL) 992 *dir = 0; 993 d = access(dir == local ? "/" : 994 dir ? local : ".", W_OK); 995 if (dir != NULL) 996 *dir = '/'; 997 if (d < 0) { 998 warn("Can't access `%s'", local); 999 code = -1; 1000 goto cleanuprecv; 1001 } 1002 if (!runique && errno == EACCES && 1003 chmod(local, (S_IRUSR|S_IWUSR)) < 0) { 1004 warn("Can't chmod `%s'", local); 1005 code = -1; 1006 goto cleanuprecv; 1007 } 1008 if (runique && errno == EACCES && 1009 (local = gunique(local)) == NULL) { 1010 code = -1; 1011 goto cleanuprecv; 1012 } 1013 } 1014 else if (runique && (local = gunique(local)) == NULL) { 1015 code = -1; 1016 goto cleanuprecv; 1017 } 1018 } 1019 if (!is_retr) { 1020 if (curtype != TYPE_A) 1021 changetype(TYPE_A, 0); 1022 } else { 1023 if (curtype != type) 1024 changetype(type, 0); 1025 filesize = remotesize(remote, 0); 1026 if (code == 421 || code == -1) 1027 goto cleanuprecv; 1028 } 1029 if (initconn()) { 1030 code = -1; 1031 goto cleanuprecv; 1032 } 1033 if (sigsetjmp(xferabort, 1)) 1034 goto abort; 1035 if (is_retr && restart_point && 1036 command("REST " LLF, (LLT) restart_point) != CONTINUE) 1037 goto cleanuprecv; 1038 if (! EMPTYSTRING(remote)) { 1039 if (command("%s %s", cmd, remote) != PRELIM) 1040 goto cleanuprecv; 1041 } else { 1042 if (command("%s", cmd) != PRELIM) 1043 goto cleanuprecv; 1044 } 1045 din = dataconn("r"); 1046 if (din == NULL) 1047 goto abort; 1048 if (!ignorespecial && strcmp(local, "-") == 0) { 1049 fout = stdout; 1050 progress = 0; 1051 preserve = 0; 1052 } else if (!ignorespecial && *local == '|') { 1053 oldpipe = xsignal(SIGPIPE, SIG_IGN); 1054 fout = popen(local + 1, "w"); 1055 if (fout == NULL) { 1056 warn("Can't execute `%s'", local+1); 1057 goto abort; 1058 } 1059 progress = 0; 1060 preserve = 0; 1061 closefunc = pclose; 1062 } else { 1063 fout = fopen(local, lmode); 1064 if (fout == NULL) { 1065 warn("Can't open `%s'", local); 1066 goto abort; 1067 } 1068 closefunc = fclose; 1069 } 1070 1071 if (fstat(fileno(fout), &st) != -1 && !S_ISREG(st.st_mode)) { 1072 progress = 0; 1073 preserve = 0; 1074 } 1075 assert(rcvbuf_size > 0); 1076 if ((size_t)rcvbuf_size > bufsize) { 1077 if (buf) 1078 (void)free(buf); 1079 bufsize = rcvbuf_size; 1080 buf = ftp_malloc(bufsize); 1081 } 1082 1083 progressmeter(-1); 1084 hash_interval = (hash && (!progress || filesize < 0)) ? mark : 0; 1085 1086 switch (curtype) { 1087 1088 case TYPE_I: 1089 case TYPE_L: 1090 if (is_retr && restart_point && 1091 lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1092 warn("Can't seek to restart `%s'", local); 1093 goto cleanuprecv; 1094 } 1095 c = copy_bytes(fileno(din), fileno(fout), buf, bufsize, 1096 rate_get, hash_interval); 1097 if (c == 1) { 1098 if (errno != EPIPE) 1099 warn("Reading from network"); 1100 bytes = -1; 1101 } else if (c == 2) { 1102 warn("Writing `%s'", local); 1103 } 1104 break; 1105 1106 case TYPE_A: 1107 if (is_retr && restart_point) { 1108 int ch; 1109 off_t i; 1110 1111 if (fseeko(fout, (off_t)0, SEEK_SET) < 0) 1112 goto done; 1113 for (i = 0; i++ < restart_point;) { 1114 if ((ch = getc(fout)) == EOF) 1115 goto done; 1116 if (ch == '\n') 1117 i++; 1118 } 1119 if (fseeko(fout, (off_t)0, SEEK_CUR) < 0) { 1120 done: 1121 warn("Can't seek to restart `%s'", local); 1122 goto cleanuprecv; 1123 } 1124 } 1125 while ((c = getc(din)) != EOF) { 1126 if (c == '\n') 1127 bare_lfs++; 1128 while (c == '\r') { 1129 while (hash_interval && bytes >= hashbytes) { 1130 (void)putc('#', ttyout); 1131 (void)fflush(ttyout); 1132 hashbytes += mark; 1133 } 1134 bytes++; 1135 if ((c = getc(din)) != '\n' || tcrflag) { 1136 if (ferror(fout)) 1137 goto break2; 1138 (void)putc('\r', fout); 1139 if (c == '\0') { 1140 bytes++; 1141 goto contin2; 1142 } 1143 if (c == EOF) 1144 goto contin2; 1145 } 1146 } 1147 (void)putc(c, fout); 1148 bytes++; 1149 contin2: ; 1150 } 1151 break2: 1152 if (hash_interval) { 1153 if (bytes < hashbytes) 1154 (void)putc('#', ttyout); 1155 (void)putc('\n', ttyout); 1156 } 1157 if (ferror(din)) { 1158 if (errno != EPIPE) 1159 warn("Reading from network"); 1160 bytes = -1; 1161 } 1162 if (ferror(fout)) 1163 warn("Writing `%s'", local); 1164 break; 1165 } 1166 1167 progressmeter(1); 1168 if (closefunc != NULL) { 1169 (*closefunc)(fout); 1170 fout = NULL; 1171 } 1172 (void)fclose(din); 1173 din = NULL; 1174 (void)getreply(0); 1175 if (bare_lfs) { 1176 fprintf(ttyout, 1177 "WARNING! %d bare linefeeds received in ASCII mode.\n", 1178 bare_lfs); 1179 fputs("File may not have transferred correctly.\n", ttyout); 1180 } 1181 if (bytes >= 0 && is_retr) { 1182 if (bytes > 0) 1183 ptransfer(0); 1184 if (preserve && (closefunc == fclose)) { 1185 mtime = remotemodtime(remote, 0); 1186 if (mtime != -1) { 1187 (void)gettimeofday(&tval[0], NULL); 1188 tval[1].tv_sec = mtime; 1189 tval[1].tv_usec = 0; 1190 if (utimes(local, tval) == -1) { 1191 fprintf(ttyout, 1192 "Can't change modification time on %s to %s", 1193 local, 1194 rfc2822time(localtime(&mtime))); 1195 } 1196 } 1197 } 1198 } 1199 goto cleanuprecv; 1200 1201 abort: 1202 /* 1203 * abort using RFC 959 recommended IP,SYNC sequence 1204 */ 1205 if (! sigsetjmp(xferabort, 1)) { 1206 /* this is the first call */ 1207 (void)xsignal(SIGINT, abort_squared); 1208 if (!cpend) { 1209 code = -1; 1210 goto cleanuprecv; 1211 } 1212 abort_remote(din); 1213 } 1214 code = -1; 1215 if (bytes > 0) 1216 ptransfer(0); 1217 1218 cleanuprecv: 1219 if (oldintr != SIG_ERR) 1220 (void)xsignal(SIGINT, oldintr); 1221 if (oldpipe != SIG_ERR) 1222 (void)xsignal(SIGPIPE, oldpipe); 1223 if (data >= 0) { 1224 (void)close(data); 1225 data = -1; 1226 } 1227 if (closefunc != NULL && fout != NULL) 1228 (*closefunc)(fout); 1229 if (din) 1230 (void)fclose(din); 1231 progress = oprogress; 1232 preserve = opreserve; 1233 bytes = 0; 1234} 1235 1236/* 1237 * Need to start a listen on the data channel before we send the command, 1238 * otherwise the server's connect may fail. 1239 */ 1240int 1241initconn(void) 1242{ 1243 char *p, *a; 1244 int result, tmpno = 0; 1245 int on = 1; 1246 int error; 1247 unsigned int addr[16], port[2]; 1248 unsigned int af, hal, pal; 1249 socklen_t len; 1250 const char *pasvcmd = NULL; 1251 int overbose; 1252 1253#ifdef INET6 1254#ifndef NO_DEBUG 1255 if (myctladdr.su_family == AF_INET6 && ftp_debug && 1256 (IN6_IS_ADDR_LINKLOCAL(&myctladdr.si_su.su_sin6.sin6_addr) || 1257 IN6_IS_ADDR_SITELOCAL(&myctladdr.si_su.su_sin6.sin6_addr))) { 1258 warnx("Use of scoped addresses can be troublesome"); 1259 } 1260#endif 1261#endif 1262 1263 reinit: 1264 if (passivemode) { 1265 data_addr = myctladdr; 1266 data = socket(data_addr.su_family, SOCK_STREAM, 0); 1267 if (data < 0) { 1268 warn("Can't create socket for data connection"); 1269 return (1); 1270 } 1271 if ((options & SO_DEBUG) && 1272 setsockopt(data, SOL_SOCKET, SO_DEBUG, 1273 (void *)&on, sizeof(on)) == -1) { 1274 DWARN("setsockopt %s (ignored)", "SO_DEBUG"); 1275 } 1276 result = COMPLETE + 1; 1277 switch (data_addr.su_family) { 1278 case AF_INET: 1279 if (epsv4 && !epsv4bad) { 1280 pasvcmd = "EPSV"; 1281 overbose = verbose; 1282 if (ftp_debug == 0) 1283 verbose = -1; 1284 result = command("EPSV"); 1285 verbose = overbose; 1286 if (verbose > 0 && 1287 (result == COMPLETE || !connected)) 1288 fprintf(ttyout, "%s\n", reply_string); 1289 if (!connected) 1290 return (1); 1291 /* 1292 * this code is to be friendly with broken 1293 * BSDI ftpd 1294 */ 1295 if (code / 10 == 22 && code != 229) { 1296 fputs( 1297"wrong server: return code must be 229\n", 1298 ttyout); 1299 result = COMPLETE + 1; 1300 } 1301 if (result != COMPLETE) { 1302 epsv4bad = 1; 1303 DPRINTF("disabling epsv4 for this " 1304 "connection\n"); 1305 } 1306 } 1307 if (result != COMPLETE) { 1308 pasvcmd = "PASV"; 1309 result = command("PASV"); 1310 if (!connected) 1311 return (1); 1312 } 1313 break; 1314#ifdef INET6 1315 case AF_INET6: 1316 if (epsv6 && !epsv6bad) { 1317 pasvcmd = "EPSV"; 1318 overbose = verbose; 1319 if (ftp_debug == 0) 1320 verbose = -1; 1321 result = command("EPSV"); 1322 verbose = overbose; 1323 if (verbose > 0 && 1324 (result == COMPLETE || !connected)) 1325 fprintf(ttyout, "%s\n", reply_string); 1326 if (!connected) 1327 return (1); 1328 /* 1329 * this code is to be friendly with 1330 * broken BSDI ftpd 1331 */ 1332 if (code / 10 == 22 && code != 229) { 1333 fputs( 1334 "wrong server: return code must be 229\n", 1335 ttyout); 1336 result = COMPLETE + 1; 1337 } 1338 if (result != COMPLETE) { 1339 epsv6bad = 1; 1340 DPRINTF("disabling epsv6 for this " 1341 "connection\n"); 1342 } 1343 } 1344 if (result != COMPLETE) { 1345 pasvcmd = "LPSV"; 1346 result = command("LPSV"); 1347 } 1348 if (!connected) 1349 return (1); 1350 break; 1351#endif 1352 default: 1353 result = COMPLETE + 1; 1354 break; 1355 } 1356 if (result != COMPLETE) { 1357 if (activefallback) { 1358 (void)close(data); 1359 data = -1; 1360 passivemode = 0; 1361#if 0 1362 activefallback = 0; 1363#endif 1364 goto reinit; 1365 } 1366 fputs("Passive mode refused.\n", ttyout); 1367 goto bad; 1368 } 1369 1370#define pack2(var, off) \ 1371 (((var[(off) + 0] & 0xff) << 8) | ((var[(off) + 1] & 0xff) << 0)) 1372#define pack4(var, off) \ 1373 (((var[(off) + 0] & 0xff) << 24) | ((var[(off) + 1] & 0xff) << 16) | \ 1374 ((var[(off) + 2] & 0xff) << 8) | ((var[(off) + 3] & 0xff) << 0)) 1375#define UC(b) (((int)b)&0xff) 1376 1377 /* 1378 * What we've got at this point is a string of comma separated 1379 * one-byte unsigned integer values, separated by commas. 1380 */ 1381 if (strcmp(pasvcmd, "PASV") == 0) { 1382 if (data_addr.su_family != AF_INET) { 1383 fputs( 1384 "Passive mode AF mismatch. Shouldn't happen!\n", ttyout); 1385 goto bad; 1386 } 1387 if (code / 10 == 22 && code != 227) { 1388 fputs("wrong server: return code must be 227\n", 1389 ttyout); 1390 goto bad; 1391 } 1392 error = sscanf(pasv, "%u,%u,%u,%u,%u,%u", 1393 &addr[0], &addr[1], &addr[2], &addr[3], 1394 &port[0], &port[1]); 1395 if (error != 6) { 1396 fputs( 1397"Passive mode address scan failure. Shouldn't happen!\n", ttyout); 1398 goto bad; 1399 } 1400 memset(&data_addr, 0, sizeof(data_addr)); 1401 data_addr.su_family = AF_INET; 1402 data_addr.su_len = sizeof(struct sockaddr_in); 1403 data_addr.si_su.su_sin.sin_addr.s_addr = 1404 htonl(pack4(addr, 0)); 1405 data_addr.su_port = htons(pack2(port, 0)); 1406 if (data_addr.si_su.su_sin.sin_addr.s_addr != 1407 hisctladdr.si_su.su_sin.sin_addr.s_addr) { 1408 fputs("Passive mode address mismatch.\n", 1409 ttyout); 1410 goto bad; 1411 } 1412 } else if (strcmp(pasvcmd, "LPSV") == 0) { 1413 if (code / 10 == 22 && code != 228) { 1414 fputs("wrong server: return code must be 228\n", 1415 ttyout); 1416 goto bad; 1417 } 1418 switch (data_addr.su_family) { 1419 case AF_INET: 1420 error = sscanf(pasv, 1421"%u,%u,%u,%u,%u,%u,%u,%u,%u", 1422 &af, &hal, 1423 &addr[0], &addr[1], &addr[2], &addr[3], 1424 &pal, &port[0], &port[1]); 1425 if (error != 9) { 1426 fputs( 1427"Passive mode address scan failure. Shouldn't happen!\n", ttyout); 1428 goto bad; 1429 } 1430 if (af != 4 || hal != 4 || pal != 2) { 1431 fputs( 1432"Passive mode AF mismatch. Shouldn't happen!\n", ttyout); 1433 goto bad; 1434 } 1435 1436 memset(&data_addr, 0, sizeof(data_addr)); 1437 data_addr.su_family = AF_INET; 1438 data_addr.su_len = sizeof(struct sockaddr_in); 1439 data_addr.si_su.su_sin.sin_addr.s_addr = 1440 htonl(pack4(addr, 0)); 1441 data_addr.su_port = htons(pack2(port, 0)); 1442 if (data_addr.si_su.su_sin.sin_addr.s_addr != 1443 hisctladdr.si_su.su_sin.sin_addr.s_addr) { 1444 fputs("Passive mode address mismatch.\n", 1445 ttyout); 1446 goto bad; 1447 } 1448 break; 1449#ifdef INET6 1450 case AF_INET6: 1451 error = sscanf(pasv, 1452"%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u", 1453 &af, &hal, 1454 &addr[0], &addr[1], &addr[2], &addr[3], 1455 &addr[4], &addr[5], &addr[6], &addr[7], 1456 &addr[8], &addr[9], &addr[10], 1457 &addr[11], &addr[12], &addr[13], 1458 &addr[14], &addr[15], 1459 &pal, &port[0], &port[1]); 1460 if (error != 21) { 1461 fputs( 1462"Passive mode address scan failure. Shouldn't happen!\n", ttyout); 1463 goto bad; 1464 } 1465 if (af != 6 || hal != 16 || pal != 2) { 1466 fputs( 1467"Passive mode AF mismatch. Shouldn't happen!\n", ttyout); 1468 goto bad; 1469 } 1470 1471 memset(&data_addr, 0, sizeof(data_addr)); 1472 data_addr.su_family = AF_INET6; 1473 data_addr.su_len = sizeof(struct sockaddr_in6); 1474 { 1475 size_t i; 1476 for (i = 0; i < sizeof(struct in6_addr); i++) { 1477 data_addr.si_su.su_sin6.sin6_addr.s6_addr[i] = 1478 UC(addr[i]); 1479 } 1480 } 1481 data_addr.su_port = htons(pack2(port, 0)); 1482 if (memcmp( 1483 &data_addr.si_su.su_sin6.sin6_addr, 1484 &hisctladdr.si_su.su_sin6.sin6_addr, 1485 sizeof(data_addr.si_su.su_sin6.sin6_addr))) { 1486 fputs("Passive mode address mismatch.\n", 1487 ttyout); 1488 goto bad; 1489 } 1490 break; 1491#endif 1492 default: 1493 fputs("Unknown passive mode AF.\n", ttyout); 1494 goto bad; 1495 } 1496 } else if (strcmp(pasvcmd, "EPSV") == 0) { 1497 char delim[4]; 1498 1499 port[0] = 0; 1500 if (code / 10 == 22 && code != 229) { 1501 fputs("wrong server: return code must be 229\n", 1502 ttyout); 1503 goto bad; 1504 } 1505 if (sscanf(pasv, "%c%c%c%d%c", &delim[0], 1506 &delim[1], &delim[2], &port[1], 1507 &delim[3]) != 5) { 1508 fputs("parse error!\n", ttyout); 1509 goto bad; 1510 } 1511 if (delim[0] != delim[1] || delim[0] != delim[2] 1512 || delim[0] != delim[3]) { 1513 fputs("parse error!\n", ttyout); 1514 goto bad; 1515 } 1516 data_addr = hisctladdr; 1517 data_addr.su_port = htons(port[1]); 1518 } else 1519 goto bad; 1520 1521 if (ftp_connect(data, (struct sockaddr *)&data_addr.si_su, 1522 data_addr.su_len, 1) < 0) { 1523 if (activefallback) { 1524 (void)close(data); 1525 data = -1; 1526 passivemode = 0; 1527#if 0 1528 activefallback = 0; 1529#endif 1530 goto reinit; 1531 } 1532 goto bad; 1533 } 1534#ifdef IPTOS_THROUGHPUT 1535 if (data_addr.su_family == AF_INET) { 1536 on = IPTOS_THROUGHPUT; 1537 if (setsockopt(data, IPPROTO_IP, IP_TOS, 1538 (void *)&on, sizeof(on)) == -1) { 1539 DWARN("setsockopt %s (ignored)", 1540 "IPTOS_THROUGHPUT"); 1541 } 1542 } 1543#endif 1544 return (0); 1545 } 1546 1547 noport: 1548 data_addr = myctladdr; 1549 if (sendport) 1550 data_addr.su_port = 0; /* let system pick one */ 1551 if (data != -1) 1552 (void)close(data); 1553 data = socket(data_addr.su_family, SOCK_STREAM, 0); 1554 if (data < 0) { 1555 warn("Can't create socket for data connection"); 1556 if (tmpno) 1557 sendport = 1; 1558 return (1); 1559 } 1560 if (!sendport) 1561 if (setsockopt(data, SOL_SOCKET, SO_REUSEADDR, 1562 (void *)&on, sizeof(on)) == -1) { 1563 warn("Can't set SO_REUSEADDR on data connection"); 1564 goto bad; 1565 } 1566 if (bind(data, (struct sockaddr *)&data_addr.si_su, 1567 data_addr.su_len) < 0) { 1568 warn("Can't bind for data connection"); 1569 goto bad; 1570 } 1571 if ((options & SO_DEBUG) && 1572 setsockopt(data, SOL_SOCKET, SO_DEBUG, 1573 (void *)&on, sizeof(on)) == -1) { 1574 DWARN("setsockopt %s (ignored)", "SO_DEBUG"); 1575 } 1576 len = sizeof(data_addr.si_su); 1577 memset((char *)&data_addr, 0, sizeof (data_addr)); 1578 if (getsockname(data, (struct sockaddr *)&data_addr.si_su, &len) == -1) { 1579 warn("Can't determine my address of data connection"); 1580 goto bad; 1581 } 1582 data_addr.su_len = len; 1583 if (ftp_listen(data, 1) < 0) 1584 warn("Can't listen to data connection"); 1585 1586 if (sendport) { 1587 char hname[NI_MAXHOST], sname[NI_MAXSERV]; 1588 struct sockinet tmp; 1589 1590 switch (data_addr.su_family) { 1591 case AF_INET: 1592 if (!epsv4 || epsv4bad) { 1593 result = COMPLETE + 1; 1594 break; 1595 } 1596#ifdef INET6 1597 /* FALLTHROUGH */ 1598 case AF_INET6: 1599 if (!epsv6 || epsv6bad) { 1600 result = COMPLETE + 1; 1601 break; 1602 } 1603#endif 1604 af = (data_addr.su_family == AF_INET) ? 1 : 2; 1605 tmp = data_addr; 1606#ifdef INET6 1607 if (tmp.su_family == AF_INET6) 1608 tmp.si_su.su_sin6.sin6_scope_id = 0; 1609#endif 1610 if (getnameinfo((struct sockaddr *)&tmp.si_su, 1611 tmp.su_len, hname, sizeof(hname), sname, 1612 sizeof(sname), NI_NUMERICHOST | NI_NUMERICSERV)) { 1613 result = ERROR; 1614 } else { 1615 overbose = verbose; 1616 if (ftp_debug == 0) 1617 verbose = -1; 1618 result = command("EPRT |%u|%s|%s|", af, hname, 1619 sname); 1620 verbose = overbose; 1621 if (verbose > 0 && 1622 (result == COMPLETE || !connected)) 1623 fprintf(ttyout, "%s\n", reply_string); 1624 if (!connected) 1625 return (1); 1626 if (result != COMPLETE) { 1627 epsv4bad = 1; 1628 DPRINTF("disabling epsv4 for this " 1629 "connection\n"); 1630 } 1631 } 1632 break; 1633 default: 1634 result = COMPLETE + 1; 1635 break; 1636 } 1637 if (result == COMPLETE) 1638 goto skip_port; 1639 1640 switch (data_addr.su_family) { 1641 case AF_INET: 1642 a = (char *)&data_addr.si_su.su_sin.sin_addr; 1643 p = (char *)&data_addr.su_port; 1644 result = command("PORT %d,%d,%d,%d,%d,%d", 1645 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1646 UC(p[0]), UC(p[1])); 1647 break; 1648#ifdef INET6 1649 case AF_INET6: { 1650 uint8_t ua[sizeof(data_addr.si_su.su_sin6.sin6_addr)]; 1651 uint8_t up[sizeof(data_addr.su_port)]; 1652 1653 memcpy(ua, &data_addr.si_su.su_sin6.sin6_addr, 1654 sizeof(ua)); 1655 memcpy(up, &data_addr.su_port, sizeof(up)); 1656 1657 result = command( 1658 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d", 1659 6, 16, 1660 ua[0], ua[1], ua[2], ua[3], 1661 ua[4], ua[5], ua[6], ua[7], 1662 ua[8], ua[9], ua[10], ua[11], 1663 ua[12], ua[13], ua[14], ua[15], 1664 2, 1665 up[0], up[1]); 1666 break; 1667 } 1668#endif 1669 default: 1670 result = COMPLETE + 1; /* xxx */ 1671 } 1672 if (!connected) 1673 return (1); 1674 skip_port: 1675 1676 if (result == ERROR && sendport == -1) { 1677 sendport = 0; 1678 tmpno = 1; 1679 goto noport; 1680 } 1681 return (result != COMPLETE); 1682 } 1683 if (tmpno) 1684 sendport = 1; 1685#ifdef IPTOS_THROUGHPUT 1686 if (data_addr.su_family == AF_INET) { 1687 on = IPTOS_THROUGHPUT; 1688 if (setsockopt(data, IPPROTO_IP, IP_TOS, 1689 (void *)&on, sizeof(on)) == -1) { 1690 DWARN("setsockopt %s (ignored)", "IPTOS_THROUGHPUT"); 1691 } 1692 } 1693#endif 1694 return (0); 1695 bad: 1696 (void)close(data); 1697 data = -1; 1698 if (tmpno) 1699 sendport = 1; 1700 return (1); 1701} 1702 1703FILE * 1704dataconn(const char *lmode) 1705{ 1706 struct sockinet from; 1707 int s, flags, rv, timeout; 1708 struct timeval endtime, now, td; 1709 struct pollfd pfd[1]; 1710 socklen_t fromlen; 1711 1712 if (passivemode) /* passive data connection */ 1713 return (fdopen(data, lmode)); 1714 1715 /* active mode data connection */ 1716 1717 if ((flags = fcntl(data, F_GETFL, 0)) == -1) 1718 goto dataconn_failed; /* get current socket flags */ 1719 if (fcntl(data, F_SETFL, flags | O_NONBLOCK) == -1) 1720 goto dataconn_failed; /* set non-blocking connect */ 1721 1722 /* NOTE: we now must restore socket flags on successful exit */ 1723 1724 /* limit time waiting on listening socket */ 1725 pfd[0].fd = data; 1726 pfd[0].events = POLLIN; 1727 (void)gettimeofday(&endtime, NULL); /* determine end time */ 1728 endtime.tv_sec += (quit_time > 0) ? quit_time: 60; 1729 /* without -q, default to 60s */ 1730 do { 1731 (void)gettimeofday(&now, NULL); 1732 timersub(&endtime, &now, &td); 1733 timeout = td.tv_sec * 1000 + td.tv_usec/1000; 1734 if (timeout < 0) 1735 timeout = 0; 1736 rv = ftp_poll(pfd, 1, timeout); 1737 /* loop until poll !EINTR && !EAGAIN */ 1738 } while (rv == -1 && (errno == EINTR || errno == EAGAIN)); 1739 if (rv == -1) { 1740 warn("Can't poll waiting before accept"); 1741 goto dataconn_failed; 1742 } 1743 if (rv == 0) { 1744 warnx("Poll timeout waiting before accept"); 1745 goto dataconn_failed; 1746 } 1747 1748 /* (non-blocking) accept the connection */ 1749 fromlen = myctladdr.su_len; 1750 do { 1751 s = accept(data, (struct sockaddr *) &from.si_su, &fromlen); 1752 /* loop until accept !EINTR && !EAGAIN */ 1753 } while (s == -1 && (errno == EINTR || errno == EAGAIN)); 1754 if (s == -1) { 1755 warn("Can't accept data connection"); 1756 goto dataconn_failed; 1757 } 1758 1759 (void)close(data); 1760 data = s; 1761 if (fcntl(data, F_SETFL, flags) == -1) /* restore socket flags */ 1762 goto dataconn_failed; 1763 1764#ifdef IPTOS_THROUGHPUT 1765 if (from.su_family == AF_INET) { 1766 int tos = IPTOS_THROUGHPUT; 1767 if (setsockopt(s, IPPROTO_IP, IP_TOS, 1768 (void *)&tos, sizeof(tos)) == -1) { 1769 DWARN("setsockopt %s (ignored)", "IPTOS_THROUGHPUT"); 1770 } 1771 } 1772#endif 1773 return (fdopen(data, lmode)); 1774 1775 dataconn_failed: 1776 (void)close(data); 1777 data = -1; 1778 return (NULL); 1779} 1780 1781void 1782psabort(int notused) 1783{ 1784 int oerrno = errno; 1785 1786 sigint_raised = 1; 1787 alarmtimer(0); 1788 abrtflag++; 1789 errno = oerrno; 1790} 1791 1792void 1793pswitch(int flag) 1794{ 1795 sigfunc oldintr; 1796 static struct comvars { 1797 int connect; 1798 char name[MAXHOSTNAMELEN]; 1799 struct sockinet mctl; 1800 struct sockinet hctl; 1801 FILE *in; 1802 FILE *out; 1803 int tpe; 1804 int curtpe; 1805 int cpnd; 1806 int sunqe; 1807 int runqe; 1808 int mcse; 1809 int ntflg; 1810 char nti[17]; 1811 char nto[17]; 1812 int mapflg; 1813 char mi[MAXPATHLEN]; 1814 char mo[MAXPATHLEN]; 1815 } proxstruct, tmpstruct; 1816 struct comvars *ip, *op; 1817 1818 abrtflag = 0; 1819 oldintr = xsignal(SIGINT, psabort); 1820 if (flag) { 1821 if (proxy) 1822 return; 1823 ip = &tmpstruct; 1824 op = &proxstruct; 1825 proxy++; 1826 } else { 1827 if (!proxy) 1828 return; 1829 ip = &proxstruct; 1830 op = &tmpstruct; 1831 proxy = 0; 1832 } 1833 ip->connect = connected; 1834 connected = op->connect; 1835 if (hostname) 1836 (void)strlcpy(ip->name, hostname, sizeof(ip->name)); 1837 else 1838 ip->name[0] = '\0'; 1839 hostname = op->name; 1840 ip->hctl = hisctladdr; 1841 hisctladdr = op->hctl; 1842 ip->mctl = myctladdr; 1843 myctladdr = op->mctl; 1844 ip->in = cin; 1845 cin = op->in; 1846 ip->out = cout; 1847 cout = op->out; 1848 ip->tpe = type; 1849 type = op->tpe; 1850 ip->curtpe = curtype; 1851 curtype = op->curtpe; 1852 ip->cpnd = cpend; 1853 cpend = op->cpnd; 1854 ip->sunqe = sunique; 1855 sunique = op->sunqe; 1856 ip->runqe = runique; 1857 runique = op->runqe; 1858 ip->mcse = mcase; 1859 mcase = op->mcse; 1860 ip->ntflg = ntflag; 1861 ntflag = op->ntflg; 1862 (void)strlcpy(ip->nti, ntin, sizeof(ip->nti)); 1863 (void)strlcpy(ntin, op->nti, sizeof(ntin)); 1864 (void)strlcpy(ip->nto, ntout, sizeof(ip->nto)); 1865 (void)strlcpy(ntout, op->nto, sizeof(ntout)); 1866 ip->mapflg = mapflag; 1867 mapflag = op->mapflg; 1868 (void)strlcpy(ip->mi, mapin, sizeof(ip->mi)); 1869 (void)strlcpy(mapin, op->mi, sizeof(mapin)); 1870 (void)strlcpy(ip->mo, mapout, sizeof(ip->mo)); 1871 (void)strlcpy(mapout, op->mo, sizeof(mapout)); 1872 (void)xsignal(SIGINT, oldintr); 1873 if (abrtflag) { 1874 abrtflag = 0; 1875 (*oldintr)(SIGINT); 1876 } 1877} 1878 1879__dead static void 1880abortpt(int notused) 1881{ 1882 1883 sigint_raised = 1; 1884 alarmtimer(0); 1885 if (fromatty) 1886 write(fileno(ttyout), "\n", 1); 1887 ptabflg++; 1888 mflag = 0; 1889 abrtflag = 0; 1890 siglongjmp(ptabort, 1); 1891} 1892 1893void 1894proxtrans(const char *cmd, const char *local, const char *remote) 1895{ 1896 sigfunc volatile oldintr; 1897 int prox_type, nfnd; 1898 int volatile secndflag; 1899 const char *volatile cmd2; 1900 1901 oldintr = SIG_ERR; 1902 secndflag = 0; 1903 if (strcmp(cmd, "RETR")) 1904 cmd2 = "RETR"; 1905 else 1906 cmd2 = runique ? "STOU" : "STOR"; 1907 if ((prox_type = type) == 0) { 1908 if (unix_server && unix_proxy) 1909 prox_type = TYPE_I; 1910 else 1911 prox_type = TYPE_A; 1912 } 1913 if (curtype != prox_type) 1914 changetype(prox_type, 1); 1915 if (command("PASV") != COMPLETE) { 1916 fputs("proxy server does not support third party transfers.\n", 1917 ttyout); 1918 return; 1919 } 1920 pswitch(0); 1921 if (!connected) { 1922 fputs("No primary connection.\n", ttyout); 1923 pswitch(1); 1924 code = -1; 1925 return; 1926 } 1927 if (curtype != prox_type) 1928 changetype(prox_type, 1); 1929 if (command("PORT %s", pasv) != COMPLETE) { 1930 pswitch(1); 1931 return; 1932 } 1933 if (sigsetjmp(ptabort, 1)) 1934 goto abort; 1935 oldintr = xsignal(SIGINT, abortpt); 1936 if ((restart_point && 1937 (command("REST " LLF, (LLT) restart_point) != CONTINUE)) 1938 || (command("%s %s", cmd, remote) != PRELIM)) { 1939 (void)xsignal(SIGINT, oldintr); 1940 pswitch(1); 1941 return; 1942 } 1943 sleep(2); 1944 pswitch(1); 1945 secndflag++; 1946 if ((restart_point && 1947 (command("REST " LLF, (LLT) restart_point) != CONTINUE)) 1948 || (command("%s %s", cmd2, local) != PRELIM)) 1949 goto abort; 1950 ptflag++; 1951 (void)getreply(0); 1952 pswitch(0); 1953 (void)getreply(0); 1954 (void)xsignal(SIGINT, oldintr); 1955 pswitch(1); 1956 ptflag = 0; 1957 fprintf(ttyout, "local: %s remote: %s\n", local, remote); 1958 return; 1959 abort: 1960 if (sigsetjmp(xferabort, 1)) { 1961 (void)xsignal(SIGINT, oldintr); 1962 return; 1963 } 1964 (void)xsignal(SIGINT, abort_squared); 1965 ptflag = 0; 1966 if (strcmp(cmd, "RETR") && !proxy) 1967 pswitch(1); 1968 else if (!strcmp(cmd, "RETR") && proxy) 1969 pswitch(0); 1970 if (!cpend && !secndflag) { /* only here if cmd = "STOR" (proxy=1) */ 1971 if (command("%s %s", cmd2, local) != PRELIM) { 1972 pswitch(0); 1973 if (cpend) 1974 abort_remote(NULL); 1975 } 1976 pswitch(1); 1977 if (ptabflg) 1978 code = -1; 1979 (void)xsignal(SIGINT, oldintr); 1980 return; 1981 } 1982 if (cpend) 1983 abort_remote(NULL); 1984 pswitch(!proxy); 1985 if (!cpend && !secndflag) { /* only if cmd = "RETR" (proxy=1) */ 1986 if (command("%s %s", cmd2, local) != PRELIM) { 1987 pswitch(0); 1988 if (cpend) 1989 abort_remote(NULL); 1990 pswitch(1); 1991 if (ptabflg) 1992 code = -1; 1993 (void)xsignal(SIGINT, oldintr); 1994 return; 1995 } 1996 } 1997 if (cpend) 1998 abort_remote(NULL); 1999 pswitch(!proxy); 2000 if (cpend) { 2001 if ((nfnd = empty(cin, NULL, 10)) <= 0) { 2002 if (nfnd < 0) 2003 warn("Error aborting proxy command"); 2004 if (ptabflg) 2005 code = -1; 2006 lostpeer(0); 2007 } 2008 (void)getreply(0); 2009 (void)getreply(0); 2010 } 2011 if (proxy) 2012 pswitch(0); 2013 pswitch(1); 2014 if (ptabflg) 2015 code = -1; 2016 (void)xsignal(SIGINT, oldintr); 2017} 2018 2019void 2020reset(int argc, char *argv[]) 2021{ 2022 int nfnd = 1; 2023 2024 if (argc == 0 && argv != NULL) { 2025 UPRINTF("usage: %s\n", argv[0]); 2026 code = -1; 2027 return; 2028 } 2029 while (nfnd > 0) { 2030 if ((nfnd = empty(cin, NULL, 0)) < 0) { 2031 warn("Error resetting connection"); 2032 code = -1; 2033 lostpeer(0); 2034 } else if (nfnd) 2035 (void)getreply(0); 2036 } 2037} 2038 2039char * 2040gunique(const char *local) 2041{ 2042 static char new[MAXPATHLEN]; 2043 char *cp = strrchr(local, '/'); 2044 int d, count=0, len; 2045 char ext = '1'; 2046 2047 if (cp) 2048 *cp = '\0'; 2049 d = access(cp == local ? "/" : cp ? local : ".", W_OK); 2050 if (cp) 2051 *cp = '/'; 2052 if (d < 0) { 2053 warn("Can't access `%s'", local); 2054 return (NULL); 2055 } 2056 len = strlcpy(new, local, sizeof(new)); 2057 cp = &new[len]; 2058 *cp++ = '.'; 2059 while (!d) { 2060 if (++count == 100) { 2061 fputs("runique: can't find unique file name.\n", 2062 ttyout); 2063 return (NULL); 2064 } 2065 *cp++ = ext; 2066 *cp = '\0'; 2067 if (ext == '9') 2068 ext = '0'; 2069 else 2070 ext++; 2071 if ((d = access(new, F_OK)) < 0) 2072 break; 2073 if (ext != '0') 2074 cp--; 2075 else if (*(cp - 2) == '.') 2076 *(cp - 1) = '1'; 2077 else { 2078 *(cp - 2) = *(cp - 2) + 1; 2079 cp--; 2080 } 2081 } 2082 return (new); 2083} 2084 2085/* 2086 * abort_squared -- 2087 * aborts abort_remote(). lostpeer() is called because if the user is 2088 * too impatient to wait or there's another problem then ftp really 2089 * needs to get back to a known state. 2090 */ 2091static void 2092abort_squared(int signo) 2093{ 2094 char msgbuf[100]; 2095 size_t len; 2096 2097 sigint_raised = 1; 2098 alarmtimer(0); 2099 len = strlcpy(msgbuf, "\nremote abort aborted; closing connection.\n", 2100 sizeof(msgbuf)); 2101 write(fileno(ttyout), msgbuf, len); 2102 lostpeer(signo); 2103 siglongjmp(xferabort, 1); 2104} 2105 2106void 2107abort_remote(FILE *din) 2108{ 2109 unsigned char buf[BUFSIZ]; 2110 int nfnd; 2111 2112 if (cout == NULL) { 2113 warnx("Lost control connection for abort"); 2114 if (ptabflg) 2115 code = -1; 2116 lostpeer(0); 2117 return; 2118 } 2119 /* 2120 * send IAC in urgent mode instead of DM because 4.3BSD places oob mark 2121 * after urgent byte rather than before as is protocol now 2122 */ 2123 buf[0] = IAC; 2124 buf[1] = IP; 2125 buf[2] = IAC; 2126 if (send(fileno(cout), buf, 3, MSG_OOB) != 3) 2127 warn("Can't send abort message"); 2128 fprintf(cout, "%cABOR\r\n", DM); 2129 (void)fflush(cout); 2130 if ((nfnd = empty(cin, din, 10)) <= 0) { 2131 if (nfnd < 0) 2132 warn("Can't send abort message"); 2133 if (ptabflg) 2134 code = -1; 2135 lostpeer(0); 2136 } 2137 if (din && (nfnd & 2)) { 2138 while (read(fileno(din), buf, BUFSIZ) > 0) 2139 continue; 2140 } 2141 if (getreply(0) == ERROR && code == 552) { 2142 /* 552 needed for nic style abort */ 2143 (void)getreply(0); 2144 } 2145 (void)getreply(0); 2146} 2147 2148/* 2149 * Ensure that ai->ai_addr is NOT an IPv4 mapped address. 2150 * IPv4 mapped address complicates too many things in FTP 2151 * protocol handling, as FTP protocol is defined differently 2152 * between IPv4 and IPv6. 2153 * 2154 * This may not be the best way to handle this situation, 2155 * since the semantics of IPv4 mapped address is defined in 2156 * the kernel. There are configurations where we should use 2157 * IPv4 mapped address as native IPv6 address, not as 2158 * "an IPv6 address that embeds IPv4 address" (namely, SIIT). 2159 * 2160 * More complete solution would be to have an additional 2161 * getsockopt to grab "real" peername/sockname. "real" 2162 * peername/sockname will be AF_INET if IPv4 mapped address 2163 * is used to embed IPv4 address, and will be AF_INET6 if 2164 * we use it as native. What a mess! 2165 */ 2166void 2167ai_unmapped(struct addrinfo *ai) 2168{ 2169#ifdef INET6 2170 struct sockaddr_in6 *sin6; 2171 struct sockaddr_in sin; 2172 socklen_t len; 2173 2174 if (ai->ai_family != AF_INET6) 2175 return; 2176 if (ai->ai_addrlen != sizeof(struct sockaddr_in6) || 2177 sizeof(sin) > ai->ai_addrlen) 2178 return; 2179 sin6 = (struct sockaddr_in6 *)ai->ai_addr; 2180 if (!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 2181 return; 2182 2183 memset(&sin, 0, sizeof(sin)); 2184 sin.sin_family = AF_INET; 2185 len = sizeof(struct sockaddr_in); 2186 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], 2187 sizeof(sin.sin_addr)); 2188 sin.sin_port = sin6->sin6_port; 2189 2190 ai->ai_family = AF_INET; 2191#if defined(HAVE_STRUCT_SOCKADDR_IN_SIN_LEN) 2192 sin.sin_len = len; 2193#endif 2194 memcpy(ai->ai_addr, &sin, len); 2195 ai->ai_addrlen = len; 2196#endif 2197} 2198 2199#ifdef NO_USAGE 2200void 2201xusage(void) 2202{ 2203 fputs("Usage error\n", ttyout); 2204} 2205#endif 2206