1 /* $NetBSD: tftp.c,v 1.36 2016/09/03 06:00:32 dholland Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)tftp.c 8.1 (Berkeley) 6/6/93"; 36 #else 37 __RCSID("$NetBSD: tftp.c,v 1.36 2016/09/03 06:00:32 dholland Exp $"); 38 #endif 39 #endif /* not lint */ 40 41 /* Many bug fixes are from Jim Guyton <guyton@rand-unix> */ 42 43 /* 44 * TFTP User Program -- Protocol Machines 45 */ 46 #include <sys/types.h> 47 #include <sys/param.h> 48 #include <sys/socket.h> 49 #include <sys/stat.h> 50 #include <sys/time.h> 51 52 #include <netinet/in.h> 53 54 #include <arpa/tftp.h> 55 #include <arpa/inet.h> 56 57 #include <err.h> 58 #include <errno.h> 59 #include <setjmp.h> 60 #include <signal.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <unistd.h> 65 #include <netdb.h> 66 67 #include "extern.h" 68 #include "tftpsubs.h" 69 70 extern jmp_buf toplevel; 71 72 char ackbuf[PKTSIZE]; 73 int timeout; 74 jmp_buf timeoutbuf; 75 76 static void nak(int, struct sockaddr *); 77 static int makerequest(int, const char *, struct tftphdr *, const char *, off_t); 78 static void printstats(const char *, unsigned long); 79 static void startclock(void); 80 static void stopclock(void); 81 static __dead void timer(int); 82 static void tpacket(const char *, struct tftphdr *, int); 83 static int cmpport(struct sockaddr *, struct sockaddr *); 84 85 static void get_options(struct tftphdr *, int); 86 static int tftp_igmp_join(void); 87 static void tftp_igmp_leave(int); 88 89 static void 90 get_options(struct tftphdr *ap, int size) 91 { 92 unsigned long val; 93 char *opt, *endp, *nextopt, *valp; 94 int l; 95 96 size -= 2; /* skip over opcode */ 97 opt = ap->th_stuff; 98 endp = opt + size - 1; 99 *endp = '\0'; 100 101 while (opt < endp) { 102 int ismulticast; 103 l = strlen(opt) + 1; 104 valp = opt + l; 105 ismulticast = !strcasecmp(opt, "multicast"); 106 if (valp < endp) { 107 val = strtoul(valp, NULL, 10); 108 l = strlen(valp) + 1; 109 nextopt = valp + l; 110 if (!ismulticast) { 111 if (val == ULONG_MAX && errno == ERANGE) { 112 /* Report illegal value */ 113 opt = nextopt; 114 continue; 115 } 116 } 117 } else { 118 /* Badly formed OACK */ 119 break; 120 } 121 if (strcmp(opt, "tsize") == 0) { 122 /* cool, but we'll ignore it */ 123 } else if (strcmp(opt, "timeout") == 0) { 124 if (val >= 1 && val <= 255) { 125 rexmtval = val; 126 } else { 127 /* Report error? */ 128 } 129 } else if (strcmp(opt, "blksize") == 0) { 130 if (val >= 8 && val <= MAXSEGSIZE) { 131 blksize = val; 132 } else { 133 /* Report error? */ 134 } 135 } else if (ismulticast) { 136 char multicast[24]; 137 char *pmulticast; 138 char *addr; 139 140 strlcpy(multicast, valp, sizeof(multicast)); 141 pmulticast = multicast; 142 addr = strsep(&pmulticast, ","); 143 if (pmulticast == NULL) 144 continue; /* Report error? */ 145 mcport = atoi(strsep(&pmulticast, ",")); 146 if (pmulticast == NULL) 147 continue; /* Report error? */ 148 mcmasterslave = atoi(pmulticast); 149 mcaddr = inet_addr(addr); 150 if (mcaddr == INADDR_NONE) 151 continue; /* Report error? */ 152 } else { 153 /* unknown option */ 154 } 155 opt = nextopt; 156 } 157 } 158 159 static int 160 tftp_igmp_join(void) 161 { 162 struct ip_mreq req; 163 struct sockaddr_in s; 164 int fd, rv; 165 166 memset(&req, 0, sizeof(struct ip_mreq)); 167 req.imr_multiaddr.s_addr = mcaddr; 168 req.imr_interface.s_addr = INADDR_ANY; 169 170 fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP); 171 if (fd < 0) { 172 perror("socket"); 173 return fd; 174 } 175 176 memset(&s, 0, sizeof(struct sockaddr_in)); 177 s.sin_family = AF_INET; 178 s.sin_port = htons(mcport); 179 s.sin_len = sizeof(struct sockaddr_in); 180 rv = bind(fd, (struct sockaddr *)&s, sizeof(struct sockaddr_in)); 181 if (rv < 0) { 182 perror("bind"); 183 close(fd); 184 return rv; 185 } 186 187 rv = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &req, 188 sizeof(struct ip_mreq)); 189 if (rv < 0) { 190 perror("setsockopt"); 191 close(fd); 192 return rv; 193 } 194 195 return fd; 196 } 197 198 static void 199 tftp_igmp_leave(int fd) 200 { 201 struct ip_mreq req; 202 int rv; 203 204 memset(&req, 0, sizeof(struct ip_mreq)); 205 req.imr_multiaddr.s_addr = mcaddr; 206 req.imr_interface.s_addr = INADDR_ANY; 207 208 rv = setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &req, 209 sizeof(struct ip_mreq)); 210 if (rv < 0) 211 perror("setsockopt"); 212 213 close(fd); 214 215 return; 216 } 217 218 /* 219 * Send the requested file. 220 */ 221 void 222 sendfile(int fd, const char *name, const char *mode) 223 { 224 struct tftphdr *ap; /* data and ack packets */ 225 struct tftphdr *dp; 226 int j, n; 227 volatile unsigned int block; 228 volatile int size, convert; 229 volatile unsigned long amount; 230 struct sockaddr_storage from; 231 struct stat sbuf; 232 volatile off_t filesize = 0; 233 socklen_t fromlen; 234 FILE *file; 235 struct sockaddr_storage peer; 236 struct sockaddr_storage serv; /* valid server port number */ 237 238 startclock(); /* start stat's clock */ 239 dp = r_init(); /* reset fillbuf/read-ahead code */ 240 ap = (struct tftphdr *)(void *)ackbuf; 241 if (tsize) { 242 if (fstat(fd, &sbuf) == 0) { 243 filesize = sbuf.st_size; 244 } else { 245 filesize = -1ULL; 246 } 247 } 248 file = fdopen(fd, "r"); 249 convert = !strcmp(mode, "netascii"); 250 block = 0; 251 amount = 0; 252 (void)memcpy(&peer, &peeraddr, (size_t)peeraddr.ss_len); 253 (void)memset(&serv, 0, sizeof(serv)); 254 255 (void)signal(SIGALRM, timer); 256 do { 257 if (block == 0) 258 size = makerequest(WRQ, name, dp, mode, filesize) - 4; 259 else { 260 /* size = read(fd, dp->th_data, SEGSIZE); */ 261 size = readit(file, &dp, blksize, convert); 262 if (size < 0) { 263 nak(errno + 100, (struct sockaddr *)(void *)&peer); 264 break; 265 } 266 dp->th_opcode = htons((u_short)DATA); 267 dp->th_block = htons((u_short)block); 268 } 269 timeout = 0; 270 (void) setjmp(timeoutbuf); 271 send_data: 272 if (trace) 273 tpacket("sent", dp, size + 4); 274 n = sendto(f, dp, (socklen_t)(size + 4), 0, 275 (struct sockaddr *)(void *)&peer, (socklen_t)peer.ss_len); 276 if (n != size + 4) { 277 warn("sendto"); 278 goto abort; 279 } 280 if (block) 281 read_ahead(file, blksize, convert); 282 for ( ; ; ) { 283 (void)alarm(rexmtval); 284 do { 285 int curf; 286 fromlen = sizeof(from); 287 if (mcaddr != INADDR_NONE) 288 curf = mf; 289 else 290 curf = f; 291 n = recvfrom(curf, ackbuf, sizeof(ackbuf), 0, 292 (struct sockaddr *)(void *)&from, &fromlen); 293 } while (n <= 0); 294 (void)alarm(0); 295 if (n < 0) { 296 warn("recvfrom"); 297 goto abort; 298 } 299 if (!serv.ss_family) 300 serv = from; 301 else if (!cmpport((struct sockaddr *)(void *)&serv, 302 (struct sockaddr *)(void *)&from)) { 303 warn("server port mismatch"); 304 goto abort; 305 } 306 peer = from; 307 if (trace) 308 tpacket("received", ap, n); 309 /* should verify packet came from server */ 310 ap->th_opcode = ntohs(ap->th_opcode); 311 if (ap->th_opcode == ERROR) { 312 (void)printf("Error code %d: %s\n", ap->th_code, 313 ap->th_msg); 314 goto abort; 315 } 316 if (ap->th_opcode == ACK) { 317 ap->th_block = ntohs(ap->th_block); 318 319 if (ap->th_block == 0) { 320 /* 321 * If the extended options are enabled, 322 * the server just refused 'em all. 323 * The only one that _really_ 324 * matters is blksize, but we'll 325 * clear timeout and mcaddr, too. 326 */ 327 blksize = def_blksize; 328 rexmtval = def_rexmtval; 329 mcaddr = INADDR_NONE; 330 } 331 if (ap->th_block == block) { 332 break; 333 } 334 /* On an error, try to synchronize 335 * both sides. 336 */ 337 j = synchnet(f, blksize+4); 338 if (j && trace) { 339 (void)printf("discarded %d packets\n", 340 j); 341 } 342 if (ap->th_block == (block-1)) { 343 goto send_data; 344 } 345 } 346 if (ap->th_opcode == OACK) { 347 if (block == 0) { 348 blksize = def_blksize; 349 rexmtval = def_rexmtval; 350 mcaddr = INADDR_NONE; 351 get_options(ap, n); 352 break; 353 } 354 } 355 } 356 if (block > 0) 357 amount += size; 358 block++; 359 } while ((size_t)size == blksize || block == 1); 360 abort: 361 (void)fclose(file); 362 stopclock(); 363 if (amount > 0) 364 printstats("Sent", amount); 365 } 366 367 /* 368 * Receive a file. 369 */ 370 void 371 recvfile(int fd, const char *name, const char *mode) 372 { 373 struct tftphdr *ap; 374 struct tftphdr *dp; 375 int j, n; 376 volatile int oack = 0; 377 volatile unsigned int block; 378 volatile int size, firsttrip; 379 volatile unsigned long amount; 380 struct sockaddr_storage from; 381 socklen_t fromlen; 382 volatile size_t readlen; 383 FILE *file; 384 volatile int convert; /* true if converting crlf -> lf */ 385 struct sockaddr_storage peer; 386 struct sockaddr_storage serv; /* valid server port number */ 387 388 startclock(); 389 dp = w_init(); 390 ap = (struct tftphdr *)(void *)ackbuf; 391 file = fdopen(fd, "w"); 392 convert = !strcmp(mode, "netascii"); 393 block = 1; 394 firsttrip = 1; 395 amount = 0; 396 (void)memcpy(&peer, &peeraddr, (size_t)peeraddr.ss_len); 397 (void)memset(&serv, 0, sizeof(serv)); 398 399 (void)signal(SIGALRM, timer); 400 do { 401 if (firsttrip) { 402 size = makerequest(RRQ, name, ap, mode, (off_t)0); 403 readlen = PKTSIZE; 404 firsttrip = 0; 405 } else { 406 ap->th_opcode = htons((u_short)ACK); 407 ap->th_block = htons((u_short)(block)); 408 readlen = blksize+4; 409 size = 4; 410 block++; 411 } 412 timeout = 0; 413 (void) setjmp(timeoutbuf); 414 send_ack: 415 if (trace) 416 tpacket("sent", ap, size); 417 if (sendto(f, ackbuf, (socklen_t)size, 0, 418 (struct sockaddr *)(void *)&peer, 419 (socklen_t)peer.ss_len) != size) { 420 (void)alarm(0); 421 warn("sendto"); 422 goto abort; 423 } 424 skip_ack: 425 if (write_behind(file, convert) == -1) 426 goto abort; 427 for ( ; ; ) { 428 (void)alarm(rexmtval); 429 do { 430 int readfd; 431 if (mf > 0) 432 readfd = mf; 433 else 434 readfd = f; 435 fromlen = sizeof(from); 436 n = recvfrom(readfd, dp, readlen, 0, 437 (struct sockaddr *)(void *)&from, &fromlen); 438 } while (n <= 0); 439 (void)alarm(0); 440 if (n < 0) { 441 warn("recvfrom"); 442 goto abort; 443 } 444 if (!serv.ss_family) 445 serv = from; 446 else if (!cmpport((struct sockaddr *)(void *)&serv, 447 (struct sockaddr *)(void *)&from)) { 448 warn("server port mismatch"); 449 goto abort; 450 } 451 peer = from; 452 if (trace) 453 tpacket("received", dp, n); 454 /* should verify client address */ 455 dp->th_opcode = ntohs(dp->th_opcode); 456 if (dp->th_opcode == ERROR) { 457 (void)printf("Error code %d: %s\n", dp->th_code, 458 dp->th_msg); 459 goto abort; 460 } 461 if (dp->th_opcode == DATA) { 462 dp->th_block = ntohs(dp->th_block); 463 464 if (dp->th_block == 1 && !oack) { 465 /* no OACK, revert to defaults */ 466 blksize = def_blksize; 467 rexmtval = def_rexmtval; 468 } 469 if (dp->th_block == block) { 470 break; /* have next packet */ 471 } 472 /* On an error, try to synchronize 473 * both sides. 474 */ 475 j = synchnet(f, blksize); 476 if (j && trace) { 477 (void)printf("discarded %d packets\n", j); 478 } 479 if (dp->th_block == (block-1)) { 480 goto send_ack; /* resend ack */ 481 } 482 } 483 if (dp->th_opcode == OACK) { 484 if (block == 1) { 485 oack = 1; 486 blksize = def_blksize; 487 rexmtval = def_rexmtval; 488 get_options(dp, n); 489 ap->th_opcode = htons(ACK); 490 ap->th_block = 0; 491 readlen = blksize+4; 492 size = 4; 493 if (mcaddr != INADDR_NONE) { 494 mf = tftp_igmp_join(); 495 if (mf < 0) 496 goto abort; 497 if (mcmasterslave == 0) 498 goto skip_ack; 499 } 500 goto send_ack; 501 } 502 } 503 } 504 /* size = write(fd, dp->th_data, n - 4); */ 505 size = writeit(file, &dp, n - 4, convert); 506 if (size < 0) { 507 nak(errno + 100, (struct sockaddr *)(void *)&peer); 508 break; 509 } 510 amount += size; 511 } while ((size_t)size == blksize); 512 abort: /* ok to ack, since user */ 513 ap->th_opcode = htons((u_short)ACK); /* has seen err msg */ 514 ap->th_block = htons((u_short)block); 515 if (mcaddr != INADDR_NONE && mf >= 0) { 516 tftp_igmp_leave(mf); 517 mf = -1; 518 } 519 (void) sendto(f, ackbuf, 4, 0, (struct sockaddr *)(void *)&peer, 520 (socklen_t)peer.ss_len); 521 /* 522 * flush last buffer 523 * We do not check for failure because last buffer 524 * can be empty, thus returning an error. 525 * XXX maybe we should fix 'write_behind' instead. 526 */ 527 (void)write_behind(file, convert); 528 (void)fclose(file); 529 stopclock(); 530 if (amount > 0) 531 printstats("Received", amount); 532 } 533 534 static int 535 makerequest(int request, const char *name, struct tftphdr *tp, const char *mode, 536 off_t filesize) 537 { 538 char *cp; 539 540 tp->th_opcode = htons((u_short)request); 541 #ifndef __SVR4 542 cp = tp->th_stuff; 543 #else 544 cp = (void *)&tp->th_stuff; 545 #endif 546 (void)strcpy(cp, name); 547 cp += strlen(name); 548 *cp++ = '\0'; 549 (void)strcpy(cp, mode); 550 cp += strlen(mode); 551 *cp++ = '\0'; 552 if (tsize) { 553 (void)strcpy(cp, "tsize"); 554 cp += strlen(cp); 555 *cp++ = '\0'; 556 (void)sprintf(cp, "%lu", (unsigned long) filesize); 557 cp += strlen(cp); 558 *cp++ = '\0'; 559 } 560 if (tout) { 561 (void)strcpy(cp, "timeout"); 562 cp += strlen(cp); 563 *cp++ = '\0'; 564 (void)sprintf(cp, "%d", rexmtval); 565 cp += strlen(cp); 566 *cp++ = '\0'; 567 } 568 if (blksize != SEGSIZE) { 569 (void)strcpy(cp, "blksize"); 570 cp += strlen(cp); 571 *cp++ = '\0'; 572 (void)sprintf(cp, "%zd", blksize); 573 cp += strlen(cp); 574 *cp++ = '\0'; 575 } 576 return (cp - (char *)(void *)tp); 577 } 578 579 const struct errmsg { 580 int e_code; 581 const char *e_msg; 582 } errmsgs[] = { 583 { EUNDEF, "Undefined error code" }, 584 { ENOTFOUND, "File not found" }, 585 { EACCESS, "Access violation" }, 586 { ENOSPACE, "Disk full or allocation exceeded" }, 587 { EBADOP, "Illegal TFTP operation" }, 588 { EBADID, "Unknown transfer ID" }, 589 { EEXISTS, "File already exists" }, 590 { ENOUSER, "No such user" }, 591 { EOPTNEG, "Option negotiation failed" }, 592 { -1, 0 } 593 }; 594 595 /* 596 * Send a nak packet (error message). 597 * Error code passed in is one of the 598 * standard TFTP codes, or a UNIX errno 599 * offset by 100. 600 */ 601 static void 602 nak(int error, struct sockaddr *peer) 603 { 604 const struct errmsg *pe; 605 struct tftphdr *tp; 606 int length; 607 size_t msglen; 608 609 tp = (struct tftphdr *)(void *)ackbuf; 610 tp->th_opcode = htons((u_short)ERROR); 611 msglen = sizeof(ackbuf) - (&tp->th_msg[0] - ackbuf); 612 for (pe = errmsgs; pe->e_code >= 0; pe++) 613 if (pe->e_code == error) 614 break; 615 if (pe->e_code < 0) { 616 tp->th_code = EUNDEF; 617 (void)strlcpy(tp->th_msg, strerror(error - 100), msglen); 618 } else { 619 tp->th_code = htons((u_short)error); 620 (void)strlcpy(tp->th_msg, pe->e_msg, msglen); 621 } 622 length = strlen(tp->th_msg); 623 msglen = &tp->th_msg[length + 1] - ackbuf; 624 if (trace) 625 tpacket("sent", tp, (int)msglen); 626 if ((size_t)sendto(f, ackbuf, msglen, 0, peer, (socklen_t)peer->sa_len) != msglen) 627 warn("nak"); 628 } 629 630 static void 631 tpacket(const char *s, struct tftphdr *tp, int n) 632 { 633 static const char *opcodes[] = 634 { "#0", "RRQ", "WRQ", "DATA", "ACK", "ERROR", "OACK" }; 635 char *cp, *file, *endp, *opt = NULL; 636 const char *spc; 637 u_short op = ntohs(tp->th_opcode); 638 int i, o; 639 640 if (op < RRQ || op > OACK) 641 (void)printf("%s opcode=%x ", s, op); 642 else 643 (void)printf("%s %s ", s, opcodes[op]); 644 switch (op) { 645 646 case RRQ: 647 case WRQ: 648 n -= 2; 649 #ifndef __SVR4 650 cp = tp->th_stuff; 651 #else 652 cp = (void *) &tp->th_stuff; 653 #endif 654 endp = cp + n - 1; 655 if (*endp != '\0') { /* Shouldn't happen, but... */ 656 *endp = '\0'; 657 } 658 file = cp; 659 cp = strchr(cp, '\0') + 1; 660 (void)printf("<file=%s, mode=%s", file, cp); 661 cp = strchr(cp, '\0') + 1; 662 o = 0; 663 while (cp < endp) { 664 i = strlen(cp) + 1; 665 if (o) { 666 (void)printf(", %s=%s", opt, cp); 667 } else { 668 opt = cp; 669 } 670 o = (o+1) % 2; 671 cp += i; 672 } 673 (void)printf(">\n"); 674 break; 675 676 case DATA: 677 (void)printf("<block=%d, %d bytes>\n", ntohs(tp->th_block), n - 4); 678 break; 679 680 case ACK: 681 (void)printf("<block=%d>\n", ntohs(tp->th_block)); 682 break; 683 684 case ERROR: 685 (void)printf("<code=%d, msg=%s>\n", ntohs(tp->th_code), tp->th_msg); 686 break; 687 688 case OACK: 689 o = 0; 690 n -= 2; 691 cp = tp->th_stuff; 692 endp = cp + n - 1; 693 if (*endp != '\0') { /* Shouldn't happen, but... */ 694 *endp = '\0'; 695 } 696 (void)printf("<"); 697 spc = ""; 698 while (cp < endp) { 699 i = strlen(cp) + 1; 700 if (o) { 701 (void)printf("%s%s=%s", spc, opt, cp); 702 spc = ", "; 703 } else { 704 opt = cp; 705 } 706 o = (o+1) % 2; 707 cp += i; 708 } 709 (void)printf(">\n"); 710 break; 711 } 712 } 713 714 struct timeval tstart; 715 struct timeval tstop; 716 717 static void 718 startclock(void) 719 { 720 721 (void)gettimeofday(&tstart, NULL); 722 } 723 724 static void 725 stopclock(void) 726 { 727 728 (void)gettimeofday(&tstop, NULL); 729 } 730 731 static void 732 printstats(const char *direction, unsigned long amount) 733 { 734 double delta; 735 736 /* compute delta in 1/10's second units */ 737 delta = ((tstop.tv_sec*10.)+(tstop.tv_usec/100000)) - 738 ((tstart.tv_sec*10.)+(tstart.tv_usec/100000)); 739 delta = delta/10.; /* back to seconds */ 740 (void)printf("%s %ld bytes in %.1f seconds", direction, amount, delta); 741 if (verbose) 742 (void)printf(" [%.0f bits/sec]", (amount*8.)/delta); 743 (void)putchar('\n'); 744 } 745 746 static void 747 /*ARGSUSED*/ 748 timer(int sig) 749 { 750 751 timeout += rexmtval; 752 if (timeout >= maxtimeout) { 753 (void)printf("Transfer timed out."); 754 longjmp(toplevel, -1); 755 } 756 longjmp(timeoutbuf, 1); 757 } 758 759 static int 760 cmpport(struct sockaddr *sa, struct sockaddr *sb) 761 { 762 char a[NI_MAXSERV], b[NI_MAXSERV]; 763 764 if (getnameinfo(sa, (socklen_t)sa->sa_len, NULL, 0, a, sizeof(a), NI_NUMERICSERV)) 765 return 0; 766 if (getnameinfo(sb, (socklen_t)sb->sa_len, NULL, 0, b, sizeof(b), NI_NUMERICSERV)) 767 return 0; 768 if (strcmp(a, b) != 0) 769 return 0; 770 771 return 1; 772 } 773