1 /* $OpenBSD: main.c,v 1.34 2013/11/26 21:08:12 deraadt Exp $ */ 2 /* $NetBSD: main.c,v 1.6 1995/05/21 16:54:10 mycroft Exp $ */ 3 4 /* 5 * Copyright (c) 1983, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * TFTP User Program -- Command Interface 35 * 36 * This version includes many modifications by Jim Guyton <guyton@rand-unix> 37 */ 38 39 #include <sys/param.h> 40 #include <sys/socket.h> 41 #include <sys/file.h> 42 43 #include <netinet/in.h> 44 #include <arpa/inet.h> 45 #include <arpa/tftp.h> 46 47 #include <ctype.h> 48 #include <err.h> 49 #include <errno.h> 50 #include <netdb.h> 51 #include <poll.h> 52 #include <signal.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 #include "extern.h" 59 60 #define LBUFLEN 200 /* size of input buffer */ 61 #define MAXARGV 20 62 #define HELPINDENT (sizeof("connect")) 63 64 void get(int, char **); 65 void help(int, char **); 66 void modecmd(int, char **); 67 void put(int, char **); 68 void quit(int, char **); 69 void setascii(int, char **); 70 void setbinary(int, char **); 71 void setpeer(char *, char *); 72 void parsearg(int, char **); 73 void setrexmt(int, char **); 74 void settimeout(int, char **); 75 void settrace(int, char **); 76 void setverbose(int, char **); 77 void settsize(int, char **); 78 void settout(int, char **); 79 void setblksize(int, char **); 80 void status(int, char **); 81 int readcmd(char *, int, FILE *); 82 static void getusage(char *); 83 static int makeargv(void); 84 static void putusage(char *); 85 static void settftpmode(char *); 86 static __dead void command(void); 87 struct cmd *getcmd(char *); 88 char *tail(char *); 89 90 struct sockaddr_storage peeraddr; 91 int f; 92 int trace; 93 int verbose; 94 int connected; 95 char mode[32]; 96 char line[LBUFLEN]; 97 int margc; 98 char *margv[MAXARGV+1]; 99 char *prompt = "tftp"; 100 void intr(int); 101 int rexmtval = TIMEOUT; 102 int maxtimeout = 5 * TIMEOUT; 103 char hostname[MAXHOSTNAMELEN]; 104 FILE *file = NULL; 105 volatile sig_atomic_t intrflag = 0; 106 char *ackbuf; 107 int has_options = 0; 108 int opt_tsize = 0; 109 int opt_tout = 0; 110 int opt_blksize = 0; 111 112 char vhelp[] = "toggle verbose mode"; 113 char thelp[] = "toggle packet tracing"; 114 char chelp[] = "connect to remote tftp"; 115 char qhelp[] = "exit tftp"; 116 char hhelp[] = "print help information"; 117 char shelp[] = "send file"; 118 char rhelp[] = "receive file"; 119 char mhelp[] = "set file transfer mode"; 120 char sthelp[] = "show current status"; 121 char xhelp[] = "set per-packet retransmission timeout"; 122 char ihelp[] = "set total retransmission timeout"; 123 char ashelp[] = "set mode to netascii"; 124 char bnhelp[] = "set mode to octet"; 125 char oshelp[] = "toggle tsize option"; 126 char othelp[] = "toggle timeout option"; 127 char obhelp[] = "set alternative blksize option"; 128 129 struct cmd { 130 char *name; 131 char *help; 132 void (*handler)(int, char **); 133 }; 134 135 struct cmd cmdtab[] = { 136 { "connect", chelp, parsearg }, 137 { "mode", mhelp, modecmd }, 138 { "put", shelp, put }, 139 { "get", rhelp, get }, 140 { "quit", qhelp, quit }, 141 { "verbose", vhelp, setverbose }, 142 { "trace", thelp, settrace }, 143 { "status", sthelp, status }, 144 { "binary", bnhelp, setbinary }, 145 { "ascii", ashelp, setascii }, 146 { "rexmt", xhelp, setrexmt }, 147 { "timeout", ihelp, settimeout }, 148 { "tsize", oshelp, settsize }, 149 { "tout", othelp, settout }, 150 { "blksize", obhelp, setblksize }, 151 { "help", hhelp, help }, 152 { "?", hhelp, help }, 153 { NULL, NULL, NULL } 154 }; 155 156 struct modes { 157 char *m_name; 158 char *m_mode; 159 } modes[] = { 160 { "ascii", "netascii" }, 161 { "netascii", "netascii" }, 162 { "binary", "octet" }, 163 { "image", "octet" }, 164 { "octet", "octet" }, 165 /* { "mail", "mail" }, */ 166 { NULL, NULL } 167 }; 168 169 int 170 main(int argc, char *argv[]) 171 { 172 f = -1; 173 174 /* set default transfer mode */ 175 strlcpy(mode, "netascii", sizeof(mode)); 176 177 /* set peer if given */ 178 if (argc > 1) 179 parsearg(argc, argv); 180 181 /* catch SIGINT */ 182 signal(SIGINT, intr); 183 184 /* allocate memory for packets */ 185 if ((ackbuf = malloc(SEGSIZE_MAX + 4)) == NULL) 186 err(1, "malloc"); 187 188 /* command prompt */ 189 command(); 190 191 return (0); 192 } 193 194 void 195 setpeer(char *host, char *port) 196 { 197 struct addrinfo hints, *res0, *res; 198 int error; 199 struct sockaddr_storage ss; 200 char *cause = "unknown"; 201 202 if (connected) { 203 close(f); 204 f = -1; 205 } 206 connected = 0; 207 208 memset(&hints, 0, sizeof(hints)); 209 hints.ai_family = PF_UNSPEC; 210 hints.ai_socktype = SOCK_DGRAM; 211 hints.ai_protocol = IPPROTO_UDP; 212 hints.ai_flags = AI_CANONNAME; 213 if (!port) 214 port = "tftp"; 215 error = getaddrinfo(host, port, &hints, &res0); 216 if (error) { 217 warnx("%s", gai_strerror(error)); 218 return; 219 } 220 221 for (res = res0; res; res = res->ai_next) { 222 if (res->ai_addrlen > sizeof(peeraddr)) 223 continue; 224 f = socket(res->ai_family, res->ai_socktype, res->ai_protocol); 225 if (f < 0) { 226 cause = "socket"; 227 continue; 228 } 229 230 memset(&ss, 0, sizeof(ss)); 231 ss.ss_family = res->ai_family; 232 ss.ss_len = res->ai_addrlen; 233 if (bind(f, (struct sockaddr *)&ss, ss.ss_len) < 0) { 234 cause = "bind"; 235 close(f); 236 f = -1; 237 continue; 238 } 239 240 break; 241 } 242 243 if (f < 0) 244 warn("%s", cause); 245 else { 246 /* res->ai_addr <= sizeof(peeraddr) is guaranteed */ 247 memcpy(&peeraddr, res->ai_addr, res->ai_addrlen); 248 if (res->ai_canonname) { 249 (void)strlcpy(hostname, res->ai_canonname, 250 sizeof(hostname)); 251 } else 252 (void)strlcpy(hostname, host, sizeof(hostname)); 253 connected = 1; 254 } 255 freeaddrinfo(res0); 256 } 257 258 void 259 parsearg(int argc, char *argv[]) 260 { 261 if (argc < 2) { 262 strlcpy(line, "Connect ", sizeof(line)); 263 printf("(to) "); 264 readcmd(&line[strlen(line)], LBUFLEN - strlen(line), stdin); 265 if (makeargv()) 266 return; 267 argc = margc; 268 argv = margv; 269 } 270 if ((argc < 2) || (argc > 3)) { 271 printf("usage: %s [host [port]]\n", argv[0]); 272 return; 273 } 274 if (argc == 2) 275 setpeer(argv[1], NULL); 276 else 277 setpeer(argv[1], argv[2]); 278 } 279 280 void 281 modecmd(int argc, char *argv[]) 282 { 283 struct modes *p; 284 char *sep; 285 286 if (argc < 2) { 287 printf("Using %s mode to transfer files.\n", mode); 288 return; 289 } 290 if (argc == 2) { 291 for (p = modes; p->m_name != NULL; p++) 292 if (strcmp(argv[1], p->m_name) == 0) 293 break; 294 if (p->m_name) { 295 settftpmode(p->m_mode); 296 return; 297 } 298 printf("%s: unknown mode\n", argv[1]); 299 /* drop through and print usage message */ 300 } 301 302 printf("usage: %s [", argv[0]); 303 sep = " "; 304 for (p = modes; p->m_name != NULL; p++) { 305 printf("%s%s", sep, p->m_name); 306 if (*sep == ' ') 307 sep = " | "; 308 } 309 printf(" ]\n"); 310 311 return; 312 } 313 314 /* ARGSUSED */ 315 void 316 setbinary(int argc, char *argv[]) 317 { 318 settftpmode("octet"); 319 } 320 321 /* ARGSUSED */ 322 void 323 setascii(int argc, char *argv[]) 324 { 325 settftpmode("netascii"); 326 } 327 328 static void 329 settftpmode(char *newmode) 330 { 331 strlcpy(mode, newmode, sizeof(mode)); 332 if (verbose) 333 printf("mode set to %s\n", mode); 334 } 335 336 /* 337 * Send file(s). 338 */ 339 void 340 put(int argc, char *argv[]) 341 { 342 int fd; 343 int n; 344 char *cp, *targ; 345 346 if (argc < 2) { 347 strlcpy(line, "put ", sizeof(line)); 348 printf("(file) "); 349 readcmd(&line[strlen(line)], LBUFLEN - strlen(line), stdin); 350 if (makeargv()) 351 return; 352 argc = margc; 353 argv = margv; 354 } 355 if (argc < 2) { 356 putusage(argv[0]); 357 return; 358 } 359 targ = argv[argc - 1]; 360 if (strrchr(argv[argc - 1], ':')) { 361 362 for (n = 1; n < argc - 1; n++) 363 if (strchr(argv[n], ':')) { 364 putusage(argv[0]); 365 return; 366 } 367 cp = argv[argc - 1]; 368 targ = strrchr(cp, ':'); 369 *targ++ = 0; 370 if (cp[0] == '[' && cp[strlen(cp) - 1] == ']') { 371 cp[strlen(cp) - 1] = '\0'; 372 cp++; 373 } 374 setpeer(cp, NULL); 375 } 376 if (!connected) { 377 printf("No target machine specified.\n"); 378 return; 379 } 380 if (argc < 4) { 381 cp = argc == 2 ? tail(targ) : argv[1]; 382 fd = open(cp, O_RDONLY); 383 if (fd < 0) { 384 warn("open: %s", cp); 385 return; 386 } 387 if (verbose) 388 printf("putting %s to %s:%s [%s]\n", 389 cp, hostname, targ, mode); 390 sendfile(fd, targ, mode); 391 return; 392 } 393 394 /* 395 * this assumes the target is a directory on 396 * on a remote unix system. hmmmm. 397 */ 398 for (n = 1; n < argc - 1; n++) { 399 if (asprintf(&cp, "%s/%s", targ, tail(argv[n])) == -1) 400 err(1, "asprintf"); 401 fd = open(argv[n], O_RDONLY); 402 if (fd < 0) { 403 warn("open: %s", argv[n]); 404 free(cp); 405 continue; 406 } 407 if (verbose) 408 printf("putting %s to %s:%s [%s]\n", 409 argv[n], hostname, cp, mode); 410 sendfile(fd, cp, mode); 411 free(cp); 412 } 413 } 414 415 static void 416 putusage(char *s) 417 { 418 printf("usage: %s file [[host:]remotename]\n", s); 419 printf(" %s file1 file2 ... fileN [[host:]remote-directory]\n", 420 s); 421 } 422 423 /* 424 * Receive file(s). 425 */ 426 void 427 get(int argc, char *argv[]) 428 { 429 int fd; 430 int n; 431 char *cp; 432 char *src; 433 434 if (argc < 2) { 435 strlcpy(line, "get ", sizeof(line)); 436 printf("(files) "); 437 readcmd(&line[strlen(line)], LBUFLEN - strlen(line), stdin); 438 if (makeargv()) 439 return; 440 argc = margc; 441 argv = margv; 442 } 443 if (argc < 2) { 444 getusage(argv[0]); 445 return; 446 } 447 if (!connected) { 448 for (n = 1; n < argc; n++) 449 if (strrchr(argv[n], ':') == 0) { 450 getusage(argv[0]); 451 return; 452 } 453 } 454 for (n = 1; n < argc; n++) { 455 src = strrchr(argv[n], ':'); 456 if (src == NULL) 457 src = argv[n]; 458 else { 459 char *cp; 460 461 *src++ = 0; 462 cp = argv[n]; 463 if (cp[0] == '[' && cp[strlen(cp) - 1] == ']') { 464 cp[strlen(cp) - 1] = '\0'; 465 cp++; 466 } 467 setpeer(cp, NULL); 468 if (!connected) 469 continue; 470 } 471 if (argc < 4) { 472 cp = argc == 3 ? argv[2] : tail(src); 473 fd = creat(cp, 0644); 474 if (fd < 0) { 475 warn("create: %s", cp); 476 return; 477 } 478 if (verbose) 479 printf("getting from %s:%s to %s [%s]\n", 480 hostname, src, cp, mode); 481 recvfile(fd, src, mode); 482 break; 483 } 484 cp = tail(src); /* new .. jdg */ 485 fd = creat(cp, 0644); 486 if (fd < 0) { 487 warn("create: %s", cp); 488 continue; 489 } 490 if (verbose) 491 printf("getting from %s:%s to %s [%s]\n", 492 hostname, src, cp, mode); 493 recvfile(fd, src, mode); 494 } 495 } 496 497 static void 498 getusage(char *s) 499 { 500 printf("usage: %s [host:]file [localname]\n", s); 501 printf(" %s [host1:]file1 [host2:]file2 ... [hostN:]fileN\n", s); 502 } 503 504 void 505 setrexmt(int argc, char *argv[]) 506 { 507 int t; 508 const char *errstr; 509 510 if (argc < 2) { 511 strlcpy(line, "Rexmt-timeout ", sizeof(line)); 512 printf("(value) "); 513 readcmd(&line[strlen(line)], LBUFLEN - strlen(line), stdin); 514 if (makeargv()) 515 return; 516 argc = margc; 517 argv = margv; 518 } 519 if (argc != 2) { 520 printf("usage: %s value\n", argv[0]); 521 return; 522 } 523 t = strtonum(argv[1], TIMEOUT_MIN, TIMEOUT_MAX, &errstr); 524 if (errstr) 525 printf("%s: value is %s\n", argv[1], errstr); 526 else 527 rexmtval = t; 528 } 529 530 void 531 settimeout(int argc, char *argv[]) 532 { 533 int t; 534 const char *errstr; 535 536 if (argc < 2) { 537 strlcpy(line, "Maximum-timeout ", sizeof(line)); 538 printf("(value) "); 539 readcmd(&line[strlen(line)], LBUFLEN - strlen(line), stdin); 540 if (makeargv()) 541 return; 542 argc = margc; 543 argv = margv; 544 } 545 if (argc != 2) { 546 printf("usage: %s value\n", argv[0]); 547 return; 548 } 549 t = strtonum(argv[1], TIMEOUT_MIN, TIMEOUT_MAX, &errstr); 550 if (errstr) 551 printf("%s: value is %s\n", argv[1], errstr); 552 else 553 maxtimeout = t; 554 } 555 556 /* ARGSUSED */ 557 void 558 status(int argc, char *argv[]) 559 { 560 if (connected) 561 printf("Connected to %s.\n", hostname); 562 else 563 printf("Not connected.\n"); 564 printf("Mode: %s Verbose: %s Tracing: %s\n", 565 mode, verbose ? "on" : "off", trace ? "on" : "off"); 566 printf("Rexmt-interval: %d seconds, Max-timeout: %d seconds\n", 567 rexmtval, maxtimeout); 568 } 569 570 /* ARGSUSED */ 571 void 572 intr(int signo) 573 { 574 intrflag = 1; 575 } 576 577 char * 578 tail(char *filename) 579 { 580 char *s; 581 582 while (*filename) { 583 s = strrchr(filename, '/'); 584 if (s == NULL) 585 break; 586 if (s[1]) 587 return (s + 1); 588 *s = '\0'; 589 } 590 591 return (filename); 592 } 593 594 /* 595 * Command parser. 596 */ 597 static __dead void 598 command(void) 599 { 600 struct cmd *c; 601 602 for (;;) { 603 printf("%s> ", prompt); 604 if (readcmd(line, LBUFLEN, stdin) < 1) 605 continue; 606 if ((line[0] == 0) || (line[0] == '\n')) 607 continue; 608 if (makeargv()) 609 continue; 610 if (margc == 0) 611 continue; 612 c = getcmd(margv[0]); 613 if (c == (struct cmd *) - 1) { 614 printf("?Ambiguous command\n"); 615 continue; 616 } 617 if (c == 0) { 618 printf("?Invalid command\n"); 619 continue; 620 } 621 (*c->handler)(margc, margv); 622 } 623 } 624 625 struct cmd * 626 getcmd(char *name) 627 { 628 char *p, *q; 629 struct cmd *c, *found; 630 int nmatches, longest; 631 632 longest = 0; 633 nmatches = 0; 634 found = 0; 635 intrflag = 0; 636 for (c = cmdtab; (p = c->name) != NULL; c++) { 637 for (q = name; *q == *p++; q++) 638 if (*q == 0) /* exact match? */ 639 return (c); 640 if (!*q) { /* the name was a prefix */ 641 if (q - name > longest) { 642 longest = q - name; 643 nmatches = 1; 644 found = c; 645 } else if (q - name == longest) 646 nmatches++; 647 } 648 } 649 if (nmatches > 1) 650 return ((struct cmd *) - 1); 651 652 return (found); 653 } 654 655 /* 656 * Slice a string up into argc/argv. 657 */ 658 static int 659 makeargv(void) 660 { 661 char *cp; 662 char **argp = margv; 663 int ret = 0; 664 665 margc = 0; 666 for (cp = line; *cp;) { 667 if (margc >= MAXARGV) { 668 printf("too many arguments\n"); 669 ret = 1; 670 break; 671 } 672 while (isspace((unsigned char)*cp)) 673 cp++; 674 if (*cp == '\0') 675 break; 676 *argp++ = cp; 677 margc += 1; 678 while (*cp != '\0' && !isspace((unsigned char)*cp)) 679 cp++; 680 if (*cp == '\0') 681 break; 682 *cp++ = '\0'; 683 } 684 *argp++ = 0; 685 686 return (ret); 687 } 688 689 /* ARGSUSED */ 690 void 691 quit(int argc, char *argv[]) 692 { 693 exit(0); 694 } 695 696 /* 697 * Help command. 698 */ 699 void 700 help(int argc, char *argv[]) 701 { 702 struct cmd *c; 703 704 if (argc == 1) { 705 printf("Commands may be abbreviated. Commands are:\n\n"); 706 for (c = cmdtab; c->name != NULL; c++) 707 printf("%-*s\t%s\n", (int)HELPINDENT, c->name, c->help); 708 return; 709 } 710 while (--argc > 0) { 711 char *arg; 712 arg = *++argv; 713 c = getcmd(arg); 714 if (c == (struct cmd *) - 1) 715 printf("?Ambiguous help command %s\n", arg); 716 else if (c == (struct cmd *)0) 717 printf("?Invalid help command %s\n", arg); 718 else 719 printf("%s\n", c->help); 720 } 721 } 722 723 /* ARGSUSED */ 724 void 725 settrace(int argc, char *argv[]) 726 { 727 trace = !trace; 728 printf("Packet tracing %s.\n", trace ? "on" : "off"); 729 } 730 731 /* ARGSUSED */ 732 void 733 setverbose(int argc, char *argv[]) 734 { 735 verbose = !verbose; 736 printf("Verbose mode %s.\n", verbose ? "on" : "off"); 737 } 738 739 /* ARGSUSED */ 740 void 741 settsize(int argc, char *argv[]) 742 { 743 opt_tsize = !opt_tsize; 744 printf("Tsize option %s.\n", opt_tsize ? "on" : "off"); 745 if (opt_tsize) 746 has_options++; 747 else 748 has_options--; 749 } 750 751 /* ARGSUSED */ 752 void 753 settout(int argc, char *argv[]) 754 { 755 opt_tout = !opt_tout; 756 printf("Timeout option %s.\n", opt_tout ? "on" : "off"); 757 if (opt_tout) 758 has_options++; 759 else 760 has_options--; 761 } 762 763 void 764 setblksize(int argc, char *argv[]) 765 { 766 int t; 767 const char *errstr; 768 769 if (argc < 2) { 770 strlcpy(line, "Blocksize ", sizeof(line)); 771 printf("(value) "); 772 readcmd(&line[strlen(line)], LBUFLEN - strlen(line), stdin); 773 if (makeargv()) 774 return; 775 argc = margc; 776 argv = margv; 777 } 778 if (argc != 2) { 779 printf("usage: %s value\n", argv[0]); 780 return; 781 } 782 t = strtonum(argv[1], SEGSIZE_MIN, SEGSIZE_MAX, &errstr); 783 if (errstr) 784 printf("%s: value is %s\n", argv[1], errstr); 785 else { 786 if (opt_blksize == 0) 787 has_options++; 788 opt_blksize = t; 789 } 790 } 791 792 int 793 readcmd(char *input, int len, FILE *stream) 794 { 795 int nfds; 796 struct pollfd pfd[1]; 797 798 fflush(stdout); 799 800 pfd[0].fd = 0; 801 pfd[0].events = POLLIN; 802 nfds = poll(pfd, 1, INFTIM); 803 if (nfds == -1) { 804 if (intrflag) { 805 intrflag = 0; 806 putchar('\n'); 807 return (0); 808 } 809 exit(1); 810 } 811 812 if (fgets(input, len, stream) == NULL) { 813 if (feof(stdin)) 814 exit(0); 815 else 816 return (-1); 817 } 818 819 return (1); 820 } 821