1 /* $NetBSD: tftp.c,v 1.26 2006/07/21 17:49:00 jmcneill 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 1.26 2006/07/21 17:49:00 jmcneill 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 char ackbuf[PKTSIZE]; 71 int timeout; 72 jmp_buf toplevel; 73 jmp_buf timeoutbuf; 74 75 static void nak __P((int, struct sockaddr *)); 76 static int makerequest __P((int, const char *, struct tftphdr *, const char *, off_t)); 77 static void printstats __P((const char *, unsigned long)); 78 static void startclock __P((void)); 79 static void stopclock __P((void)); 80 static void timer __P((int)); 81 static void tpacket __P((const char *, struct tftphdr *, int)); 82 static int cmpport __P((struct sockaddr *, struct sockaddr *)); 83 84 static void get_options(struct tftphdr *, int); 85 static int tftp_igmp_join(void); 86 static void tftp_igmp_leave(int); 87 88 static void 89 get_options(struct tftphdr *ap, int size) 90 { 91 unsigned long val; 92 char *opt, *endp, *nextopt, *valp; 93 int l; 94 95 size -= 2; /* skip over opcode */ 96 opt = ap->th_stuff; 97 endp = opt + size - 1; 98 *endp = '\0'; 99 100 while (opt < endp) { 101 int ismulticast; 102 l = strlen(opt) + 1; 103 valp = opt + l; 104 ismulticast = !strcasecmp(opt, "multicast"); 105 if (valp < endp) { 106 val = strtoul(valp, NULL, 10); 107 l = strlen(valp) + 1; 108 nextopt = valp + l; 109 if (!ismulticast) { 110 if (val == ULONG_MAX && errno == ERANGE) { 111 /* Report illegal value */ 112 opt = nextopt; 113 continue; 114 } 115 } 116 } else { 117 /* Badly formed OACK */ 118 break; 119 } 120 if (strcmp(opt, "tsize") == 0) { 121 /* cool, but we'll ignore it */ 122 } else if (strcmp(opt, "timeout") == 0) { 123 if (val >= 1 && val <= 255) { 124 rexmtval = val; 125 } else { 126 /* Report error? */ 127 } 128 } else if (strcmp(opt, "blksize") == 0) { 129 if (val >= 8 && val <= MAXSEGSIZE) { 130 blksize = val; 131 } else { 132 /* Report error? */ 133 } 134 } else if (ismulticast) { 135 char multicast[24]; 136 char *pmulticast; 137 char *addr; 138 139 strlcpy(multicast, valp, sizeof(multicast)); 140 pmulticast = multicast; 141 addr = strsep(&pmulticast, ","); 142 if (multicast == NULL) 143 continue; /* Report error? */ 144 mcport = atoi(strsep(&pmulticast, ",")); 145 if (multicast == NULL) 146 continue; /* Report error? */ 147 mcmasterslave = atoi(multicast); 148 mcaddr = inet_addr(addr); 149 if (mcaddr == INADDR_NONE) 150 continue; /* Report error? */ 151 } else { 152 /* unknown option */ 153 } 154 opt = nextopt; 155 } 156 } 157 158 static int 159 tftp_igmp_join(void) 160 { 161 struct ip_mreq req; 162 struct sockaddr_in s; 163 int fd, rv; 164 165 memset(&req, 0, sizeof(struct ip_mreq)); 166 req.imr_multiaddr.s_addr = mcaddr; 167 req.imr_interface.s_addr = INADDR_ANY; 168 169 fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP); 170 if (fd < 0) { 171 perror("socket"); 172 return fd; 173 } 174 175 memset(&s, 0, sizeof(struct sockaddr_in)); 176 s.sin_family = AF_INET; 177 s.sin_port = htons(mcport); 178 s.sin_len = sizeof(struct sockaddr_in); 179 rv = bind(fd, (struct sockaddr *)&s, sizeof(struct sockaddr_in)); 180 if (rv < 0) { 181 perror("bind"); 182 close(fd); 183 return rv; 184 } 185 186 rv = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &req, 187 sizeof(struct ip_mreq)); 188 if (rv < 0) { 189 perror("setsockopt"); 190 close(fd); 191 return rv; 192 } 193 194 return fd; 195 } 196 197 static void 198 tftp_igmp_leave(int fd) 199 { 200 struct ip_mreq req; 201 int rv; 202 203 memset(&req, 0, sizeof(struct ip_mreq)); 204 req.imr_multiaddr.s_addr = mcaddr; 205 req.imr_interface.s_addr = INADDR_ANY; 206 207 rv = setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &req, 208 sizeof(struct ip_mreq)); 209 if (rv < 0) 210 perror("setsockopt"); 211 212 close(fd); 213 214 return; 215 } 216 217 /* 218 * Send the requested file. 219 */ 220 void 221 sendfile(fd, name, mode) 222 int fd; 223 char *name; 224 char *mode; 225 { 226 struct tftphdr *ap; /* data and ack packets */ 227 struct tftphdr *dp; 228 int j, n; 229 volatile unsigned int block; 230 volatile int size, convert; 231 volatile unsigned long amount; 232 struct sockaddr_storage from; 233 struct stat sbuf; 234 off_t filesize=0; 235 socklen_t fromlen; 236 FILE *file; 237 struct sockaddr_storage peer; 238 struct sockaddr_storage serv; /* valid server port number */ 239 240 startclock(); /* start stat's clock */ 241 dp = r_init(); /* reset fillbuf/read-ahead code */ 242 ap = (struct tftphdr *)(void *)ackbuf; 243 if (tsize) { 244 if (fstat(fd, &sbuf) == 0) { 245 filesize = sbuf.st_size; 246 } else { 247 filesize = -1ULL; 248 } 249 } 250 file = fdopen(fd, "r"); 251 convert = !strcmp(mode, "netascii"); 252 block = 0; 253 amount = 0; 254 (void)memcpy(&peer, &peeraddr, (size_t)peeraddr.ss_len); 255 (void)memset(&serv, 0, sizeof(serv)); 256 257 (void)signal(SIGALRM, timer); 258 do { 259 if (block == 0) 260 size = makerequest(WRQ, name, dp, mode, filesize) - 4; 261 else { 262 /* size = read(fd, dp->th_data, SEGSIZE); */ 263 size = readit(file, &dp, blksize, convert); 264 if (size < 0) { 265 nak(errno + 100, (struct sockaddr *)(void *)&peer); 266 break; 267 } 268 dp->th_opcode = htons((u_short)DATA); 269 dp->th_block = htons((u_short)block); 270 } 271 timeout = 0; 272 (void) setjmp(timeoutbuf); 273 send_data: 274 if (trace) 275 tpacket("sent", dp, size + 4); 276 n = sendto(f, dp, (socklen_t)(size + 4), 0, 277 (struct sockaddr *)(void *)&peer, (socklen_t)peer.ss_len); 278 if (n != size + 4) { 279 warn("sendto"); 280 goto abort; 281 } 282 if (block) 283 read_ahead(file, blksize, convert); 284 for ( ; ; ) { 285 (void)alarm(rexmtval); 286 do { 287 int curf; 288 fromlen = sizeof(from); 289 if (mcaddr != INADDR_NONE) 290 curf = mf; 291 else 292 curf = f; 293 n = recvfrom(curf, ackbuf, sizeof(ackbuf), 0, 294 (struct sockaddr *)(void *)&from, &fromlen); 295 } while (n <= 0); 296 (void)alarm(0); 297 if (n < 0) { 298 warn("recvfrom"); 299 goto abort; 300 } 301 if (!serv.ss_family) 302 serv = from; 303 else if (!cmpport((struct sockaddr *)(void *)&serv, 304 (struct sockaddr *)(void *)&from)) { 305 warn("server port mismatch"); 306 goto abort; 307 } 308 peer = from; 309 if (trace) 310 tpacket("received", ap, n); 311 /* should verify packet came from server */ 312 ap->th_opcode = ntohs(ap->th_opcode); 313 if (ap->th_opcode == ERROR) { 314 (void)printf("Error code %d: %s\n", ap->th_code, 315 ap->th_msg); 316 goto abort; 317 } 318 if (ap->th_opcode == ACK) { 319 ap->th_block = ntohs(ap->th_block); 320 321 if (ap->th_block == 0) { 322 /* 323 * If the extended options are enabled, 324 * the server just refused 'em all. 325 * The only one that _really_ 326 * matters is blksize, but we'll 327 * clear timeout and mcaddr, too. 328 */ 329 blksize = def_blksize; 330 rexmtval = def_rexmtval; 331 mcaddr = INADDR_NONE; 332 } 333 if (ap->th_block == block) { 334 break; 335 } 336 /* On an error, try to synchronize 337 * both sides. 338 */ 339 j = synchnet(f, blksize+4); 340 if (j && trace) { 341 (void)printf("discarded %d packets\n", 342 j); 343 } 344 if (ap->th_block == (block-1)) { 345 goto send_data; 346 } 347 } 348 if (ap->th_opcode == OACK) { 349 if (block == 0) { 350 blksize = def_blksize; 351 rexmtval = def_rexmtval; 352 mcaddr = INADDR_NONE; 353 get_options(ap, n); 354 break; 355 } 356 } 357 } 358 if (block > 0) 359 amount += size; 360 block++; 361 } while (size == blksize || block == 1); 362 abort: 363 (void)fclose(file); 364 stopclock(); 365 if (amount > 0) 366 printstats("Sent", amount); 367 } 368 369 /* 370 * Receive a file. 371 */ 372 void 373 recvfile(fd, name, mode) 374 int fd; 375 char *name; 376 char *mode; 377 { 378 struct tftphdr *ap; 379 struct tftphdr *dp; 380 int j, n, oack=0; 381 volatile unsigned int block; 382 volatile int size, firsttrip; 383 volatile unsigned long amount; 384 struct sockaddr_storage from; 385 socklen_t fromlen; 386 size_t readlen; 387 FILE *file; 388 volatile int convert; /* true if converting crlf -> lf */ 389 struct sockaddr_storage peer; 390 struct sockaddr_storage serv; /* valid server port number */ 391 392 startclock(); 393 dp = w_init(); 394 ap = (struct tftphdr *)(void *)ackbuf; 395 file = fdopen(fd, "w"); 396 convert = !strcmp(mode, "netascii"); 397 block = 1; 398 firsttrip = 1; 399 amount = 0; 400 (void)memcpy(&peer, &peeraddr, (size_t)peeraddr.ss_len); 401 (void)memset(&serv, 0, sizeof(serv)); 402 403 (void)signal(SIGALRM, timer); 404 do { 405 if (firsttrip) { 406 size = makerequest(RRQ, name, ap, mode, (off_t)0); 407 readlen = PKTSIZE; 408 firsttrip = 0; 409 } else { 410 ap->th_opcode = htons((u_short)ACK); 411 ap->th_block = htons((u_short)(block)); 412 readlen = blksize+4; 413 size = 4; 414 block++; 415 } 416 timeout = 0; 417 (void) setjmp(timeoutbuf); 418 send_ack: 419 if (trace) 420 tpacket("sent", ap, size); 421 if (sendto(f, ackbuf, (socklen_t)size, 0, 422 (struct sockaddr *)(void *)&peer, 423 (socklen_t)peer.ss_len) != size) { 424 (void)alarm(0); 425 warn("sendto"); 426 goto abort; 427 } 428 skip_ack: 429 if (write_behind(file, convert) == -1) 430 goto abort; 431 for ( ; ; ) { 432 (void)alarm(rexmtval); 433 do { 434 int readfd; 435 if (mf > 0) 436 readfd = mf; 437 else 438 readfd = f; 439 fromlen = sizeof(from); 440 n = recvfrom(readfd, dp, readlen, 0, 441 (struct sockaddr *)(void *)&from, &fromlen); 442 } while (n <= 0); 443 (void)alarm(0); 444 if (n < 0) { 445 warn("recvfrom"); 446 goto abort; 447 } 448 if (!serv.ss_family) 449 serv = from; 450 else if (!cmpport((struct sockaddr *)(void *)&serv, 451 (struct sockaddr *)(void *)&from)) { 452 warn("server port mismatch"); 453 goto abort; 454 } 455 peer = from; 456 if (trace) 457 tpacket("received", dp, n); 458 /* should verify client address */ 459 dp->th_opcode = ntohs(dp->th_opcode); 460 if (dp->th_opcode == ERROR) { 461 (void)printf("Error code %d: %s\n", dp->th_code, 462 dp->th_msg); 463 goto abort; 464 } 465 if (dp->th_opcode == DATA) { 466 dp->th_block = ntohs(dp->th_block); 467 468 if (dp->th_block == 1 && !oack) { 469 /* no OACK, revert to defaults */ 470 blksize = def_blksize; 471 rexmtval = def_rexmtval; 472 } 473 if (dp->th_block == block) { 474 break; /* have next packet */ 475 } 476 /* On an error, try to synchronize 477 * both sides. 478 */ 479 j = synchnet(f, blksize); 480 if (j && trace) { 481 (void)printf("discarded %d packets\n", j); 482 } 483 if (dp->th_block == (block-1)) { 484 goto send_ack; /* resend ack */ 485 } 486 } 487 if (dp->th_opcode == OACK) { 488 if (block == 1) { 489 oack = 1; 490 blksize = def_blksize; 491 rexmtval = def_rexmtval; 492 get_options(dp, n); 493 ap->th_opcode = htons(ACK); 494 ap->th_block = 0; 495 readlen = blksize+4; 496 size = 4; 497 if (mcaddr != INADDR_NONE) { 498 mf = tftp_igmp_join(); 499 if (mcmasterslave == 0) 500 goto skip_ack; 501 } 502 goto send_ack; 503 } 504 } 505 } 506 /* size = write(fd, dp->th_data, n - 4); */ 507 size = writeit(file, &dp, n - 4, convert); 508 if (size < 0) { 509 nak(errno + 100, (struct sockaddr *)(void *)&peer); 510 break; 511 } 512 amount += size; 513 } while (size == blksize); 514 abort: /* ok to ack, since user */ 515 ap->th_opcode = htons((u_short)ACK); /* has seen err msg */ 516 ap->th_block = htons((u_short)block); 517 if (mcaddr != INADDR_NONE) { 518 tftp_igmp_leave(mf); 519 mf = -1; 520 } 521 (void) sendto(f, ackbuf, 4, 0, (struct sockaddr *)(void *)&peer, 522 (socklen_t)peer.ss_len); 523 /* 524 * flush last buffer 525 * We do not check for failure because last buffer 526 * can be empty, thus returning an error. 527 * XXX maybe we should fix 'write_behind' instead. 528 */ 529 (void)write_behind(file, convert); 530 (void)fclose(file); 531 stopclock(); 532 if (amount > 0) 533 printstats("Received", amount); 534 } 535 536 static int 537 makerequest(request, name, tp, mode, filesize) 538 int request; 539 const char *name; 540 struct tftphdr *tp; 541 const char *mode; 542 off_t filesize; 543 { 544 char *cp; 545 546 tp->th_opcode = htons((u_short)request); 547 #ifndef __SVR4 548 cp = tp->th_stuff; 549 #else 550 cp = (void *)&tp->th_stuff; 551 #endif 552 (void)strcpy(cp, name); 553 cp += strlen(name); 554 *cp++ = '\0'; 555 (void)strcpy(cp, mode); 556 cp += strlen(mode); 557 *cp++ = '\0'; 558 if (tsize) { 559 (void)strcpy(cp, "tsize"); 560 cp += strlen(cp); 561 *cp++ = '\0'; 562 (void)sprintf(cp, "%lu", (unsigned long) filesize); 563 cp += strlen(cp); 564 *cp++ = '\0'; 565 } 566 if (tout) { 567 (void)strcpy(cp, "timeout"); 568 cp += strlen(cp); 569 *cp++ = '\0'; 570 (void)sprintf(cp, "%d", rexmtval); 571 cp += strlen(cp); 572 *cp++ = '\0'; 573 } 574 if (blksize != SEGSIZE) { 575 (void)strcpy(cp, "blksize"); 576 cp += strlen(cp); 577 *cp++ = '\0'; 578 (void)sprintf(cp, "%zd", blksize); 579 cp += strlen(cp); 580 *cp++ = '\0'; 581 } 582 return (cp - (char *)(void *)tp); 583 } 584 585 const struct errmsg { 586 int e_code; 587 const char *e_msg; 588 } errmsgs[] = { 589 { EUNDEF, "Undefined error code" }, 590 { ENOTFOUND, "File not found" }, 591 { EACCESS, "Access violation" }, 592 { ENOSPACE, "Disk full or allocation exceeded" }, 593 { EBADOP, "Illegal TFTP operation" }, 594 { EBADID, "Unknown transfer ID" }, 595 { EEXISTS, "File already exists" }, 596 { ENOUSER, "No such user" }, 597 { EOPTNEG, "Option negotiation failed" }, 598 { -1, 0 } 599 }; 600 601 /* 602 * Send a nak packet (error message). 603 * Error code passed in is one of the 604 * standard TFTP codes, or a UNIX errno 605 * offset by 100. 606 */ 607 static void 608 nak(error, peer) 609 int error; 610 struct sockaddr *peer; 611 { 612 const struct errmsg *pe; 613 struct tftphdr *tp; 614 int length; 615 size_t msglen; 616 617 tp = (struct tftphdr *)(void *)ackbuf; 618 tp->th_opcode = htons((u_short)ERROR); 619 msglen = sizeof(ackbuf) - (&tp->th_msg[0] - ackbuf); 620 for (pe = errmsgs; pe->e_code >= 0; pe++) 621 if (pe->e_code == error) 622 break; 623 if (pe->e_code < 0) { 624 tp->th_code = EUNDEF; 625 (void)strlcpy(tp->th_msg, strerror(error - 100), msglen); 626 } else { 627 tp->th_code = htons((u_short)error); 628 (void)strlcpy(tp->th_msg, pe->e_msg, msglen); 629 } 630 length = strlen(tp->th_msg); 631 msglen = &tp->th_msg[length + 1] - ackbuf; 632 if (trace) 633 tpacket("sent", tp, (int)msglen); 634 if (sendto(f, ackbuf, msglen, 0, peer, (socklen_t)peer->sa_len) != msglen) 635 warn("nak"); 636 } 637 638 static void 639 tpacket(s, tp, n) 640 const char *s; 641 struct tftphdr *tp; 642 int n; 643 { 644 static const char *opcodes[] = 645 { "#0", "RRQ", "WRQ", "DATA", "ACK", "ERROR", "OACK" }; 646 char *cp, *file, *endp, *opt = NULL; 647 const char *spc; 648 u_short op = ntohs(tp->th_opcode); 649 int i, o; 650 651 if (op < RRQ || op > OACK) 652 (void)printf("%s opcode=%x ", s, op); 653 else 654 (void)printf("%s %s ", s, opcodes[op]); 655 switch (op) { 656 657 case RRQ: 658 case WRQ: 659 n -= 2; 660 #ifndef __SVR4 661 cp = tp->th_stuff; 662 #else 663 cp = (void *) &tp->th_stuff; 664 #endif 665 endp = cp + n - 1; 666 if (*endp != '\0') { /* Shouldn't happen, but... */ 667 *endp = '\0'; 668 } 669 file = cp; 670 cp = strchr(cp, '\0') + 1; 671 (void)printf("<file=%s, mode=%s", file, cp); 672 cp = strchr(cp, '\0') + 1; 673 o = 0; 674 while (cp < endp) { 675 i = strlen(cp) + 1; 676 if (o) { 677 (void)printf(", %s=%s", opt, cp); 678 } else { 679 opt = cp; 680 } 681 o = (o+1) % 2; 682 cp += i; 683 } 684 (void)printf(">\n"); 685 break; 686 687 case DATA: 688 (void)printf("<block=%d, %d bytes>\n", ntohs(tp->th_block), n - 4); 689 break; 690 691 case ACK: 692 (void)printf("<block=%d>\n", ntohs(tp->th_block)); 693 break; 694 695 case ERROR: 696 (void)printf("<code=%d, msg=%s>\n", ntohs(tp->th_code), tp->th_msg); 697 break; 698 699 case OACK: 700 o = 0; 701 n -= 2; 702 cp = tp->th_stuff; 703 endp = cp + n - 1; 704 if (*endp != '\0') { /* Shouldn't happen, but... */ 705 *endp = '\0'; 706 } 707 (void)printf("<"); 708 spc = ""; 709 while (cp < endp) { 710 i = strlen(cp) + 1; 711 if (o) { 712 (void)printf("%s%s=%s", spc, opt, cp); 713 spc = ", "; 714 } else { 715 opt = cp; 716 } 717 o = (o+1) % 2; 718 cp += i; 719 } 720 (void)printf(">\n"); 721 break; 722 } 723 } 724 725 struct timeval tstart; 726 struct timeval tstop; 727 728 static void 729 startclock() 730 { 731 732 (void)gettimeofday(&tstart, NULL); 733 } 734 735 static void 736 stopclock() 737 { 738 739 (void)gettimeofday(&tstop, NULL); 740 } 741 742 static void 743 printstats(direction, amount) 744 const char *direction; 745 unsigned long amount; 746 { 747 double delta; 748 749 /* compute delta in 1/10's second units */ 750 delta = ((tstop.tv_sec*10.)+(tstop.tv_usec/100000)) - 751 ((tstart.tv_sec*10.)+(tstart.tv_usec/100000)); 752 delta = delta/10.; /* back to seconds */ 753 (void)printf("%s %ld bytes in %.1f seconds", direction, amount, delta); 754 if (verbose) 755 (void)printf(" [%.0f bits/sec]", (amount*8.)/delta); 756 (void)putchar('\n'); 757 } 758 759 static void 760 /*ARGSUSED*/ 761 timer(sig) 762 int sig; 763 { 764 765 timeout += rexmtval; 766 if (timeout >= maxtimeout) { 767 (void)printf("Transfer timed out.\n"); 768 longjmp(toplevel, -1); 769 } 770 longjmp(timeoutbuf, 1); 771 } 772 773 static int 774 cmpport(sa, sb) 775 struct sockaddr *sa; 776 struct sockaddr *sb; 777 { 778 char a[NI_MAXSERV], b[NI_MAXSERV]; 779 780 if (getnameinfo(sa, (socklen_t)sa->sa_len, NULL, 0, a, sizeof(a), NI_NUMERICSERV)) 781 return 0; 782 if (getnameinfo(sb, (socklen_t)sb->sa_len, NULL, 0, b, sizeof(b), NI_NUMERICSERV)) 783 return 0; 784 if (strcmp(a, b) != 0) 785 return 0; 786 787 return 1; 788 } 789