1 /* 2 * bootptest.c - Test out a bootp server. 3 * 4 * This simple program was put together from pieces taken from 5 * various places, including the CMU BOOTP client and server. 6 * The packet printing routine is from the Berkeley "tcpdump" 7 * program with some enhancements I added. The print-bootp.c 8 * file was shared with my copy of "tcpdump" and therefore uses 9 * some unusual utility routines that would normally be provided 10 * by various parts of the tcpdump program. Gordon W. Ross 11 * 12 * Boilerplate: 13 * 14 * This program includes software developed by the University of 15 * California, Lawrence Berkeley Laboratory and its contributors. 16 * (See the copyright notice in print-bootp.c) 17 * 18 * The remainder of this program is public domain. You may do 19 * whatever you like with it except claim that you wrote it. 20 * 21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 22 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 24 * 25 * HISTORY: 26 * 27 * 12/02/93 Released version 1.4 (with bootp-2.3.2) 28 * 11/05/93 Released version 1.3 29 * 10/14/93 Released version 1.2 30 * 10/11/93 Released version 1.1 31 * 09/28/93 Released version 1.0 32 * 09/93 Original developed by Gordon W. Ross <gwr@mc.com> 33 * 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 char *usage = "bootptest [-h] server-name [vendor-data-template-file]"; 40 41 #include <sys/types.h> 42 #include <sys/socket.h> 43 #include <sys/ioctl.h> 44 #include <sys/file.h> 45 #include <sys/time.h> 46 #include <sys/stat.h> 47 #include <sys/utsname.h> 48 49 #include <net/if.h> 50 #include <netinet/in.h> 51 #include <arpa/inet.h> /* inet_ntoa */ 52 53 #ifndef NO_UNISTD 54 #include <unistd.h> 55 #endif 56 57 #include <err.h> 58 #include <stdlib.h> 59 #include <signal.h> 60 #include <stdio.h> 61 #include <string.h> 62 #include <errno.h> 63 #include <ctype.h> 64 #include <netdb.h> 65 #include <assert.h> 66 67 #include "bootp.h" 68 #include "bootptest.h" 69 #include "getif.h" 70 #include "getether.h" 71 72 #include "patchlevel.h" 73 74 static void send_request(); 75 76 #define LOG_ERR 1 77 #define BUFLEN 1024 78 #define WAITSECS 1 79 #define MAXWAIT 10 80 81 int vflag = 1; 82 int tflag = 0; 83 int thiszone; 84 char *progname; 85 unsigned char *packetp; 86 unsigned char *snapend; 87 int snaplen; 88 89 90 /* 91 * IP port numbers for client and server obtained from /etc/services 92 */ 93 94 u_short bootps_port, bootpc_port; 95 96 97 /* 98 * Internet socket and interface config structures 99 */ 100 101 struct sockaddr_in sin_server; /* where to send requests */ 102 struct sockaddr_in sin_client; /* for bind and listen */ 103 struct sockaddr_in sin_from; /* Packet source */ 104 u_char eaddr[16]; /* Ethernet address */ 105 106 /* 107 * General 108 */ 109 110 int debug = 1; /* Debugging flag (level) */ 111 char *sndbuf; /* Send packet buffer */ 112 char *rcvbuf; /* Receive packet buffer */ 113 114 struct utsname my_uname; 115 char *hostname; 116 117 /* 118 * Vendor magic cookies for CMU and RFC1048 119 */ 120 121 unsigned char vm_cmu[4] = VM_CMU; 122 unsigned char vm_rfc1048[4] = VM_RFC1048; 123 short secs; /* How long client has waited */ 124 125 char *get_errmsg(); 126 extern void bootp_print(); 127 128 /* 129 * Initialization such as command-line processing is done, then 130 * the receiver loop is started. Die when interrupted. 131 */ 132 133 int 134 main(argc, argv) 135 int argc; 136 char **argv; 137 { 138 struct bootp *bp; 139 struct servent *sep; 140 struct hostent *hep; 141 142 char *servername = NULL; 143 char *vendor_file = NULL; 144 char *bp_file = NULL; 145 int32 server_addr; /* inet addr, network order */ 146 int s; /* Socket file descriptor */ 147 int n, fromlen, recvcnt; 148 int use_hwa = 0; 149 int32 vend_magic; 150 int32 xid; 151 152 progname = strrchr(argv[0], '/'); 153 if (progname) 154 progname++; 155 else 156 progname = argv[0]; 157 argc--; 158 argv++; 159 160 if (debug) 161 printf("%s: version %s.%d\n", progname, VERSION, PATCHLEVEL); 162 163 /* 164 * Verify that "struct bootp" has the correct official size. 165 * (Catch evil compilers that do struct padding.) 166 */ 167 assert(sizeof(struct bootp) == BP_MINPKTSZ); 168 169 if (uname(&my_uname) < 0) 170 errx(1, "can't get hostname"); 171 hostname = my_uname.nodename; 172 173 sndbuf = malloc(BUFLEN); 174 rcvbuf = malloc(BUFLEN); 175 if (!sndbuf || !rcvbuf) { 176 printf("malloc failed\n"); 177 exit(1); 178 } 179 180 /* default magic number */ 181 bcopy(vm_rfc1048, (char*)&vend_magic, 4); 182 183 /* Handle option switches. */ 184 while (argc > 0) { 185 if (argv[0][0] != '-') 186 break; 187 switch (argv[0][1]) { 188 189 case 'f': /* File name to request. */ 190 if (argc < 2) 191 goto error; 192 argc--; argv++; 193 bp_file = *argv; 194 break; 195 196 case 'h': /* Use hardware address. */ 197 use_hwa = 1; 198 break; 199 200 case 'm': /* Magic number value. */ 201 if (argc < 2) 202 goto error; 203 argc--; argv++; 204 vend_magic = inet_addr(*argv); 205 break; 206 207 error: 208 default: 209 puts(usage); 210 exit(1); 211 212 } 213 argc--; 214 argv++; 215 } 216 217 /* Get server name (or address) for query. */ 218 if (argc > 0) { 219 servername = *argv; 220 argc--; 221 argv++; 222 } 223 /* Get optional vendor-data-template-file. */ 224 if (argc > 0) { 225 vendor_file = *argv; 226 argc--; 227 argv++; 228 } 229 if (!servername) { 230 printf("missing server name.\n"); 231 puts(usage); 232 exit(1); 233 } 234 /* 235 * Create a socket. 236 */ 237 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 238 perror("socket"); 239 exit(1); 240 } 241 /* 242 * Get server's listening port number 243 */ 244 sep = getservbyname("bootps", "udp"); 245 if (sep) { 246 bootps_port = ntohs((u_short) sep->s_port); 247 } else { 248 warnx("bootps/udp: unknown service -- using port %d", 249 IPPORT_BOOTPS); 250 bootps_port = (u_short) IPPORT_BOOTPS; 251 } 252 253 /* 254 * Set up server socket address (for send) 255 */ 256 if (servername) { 257 if (isdigit(servername[0])) 258 server_addr = inet_addr(servername); 259 else { 260 hep = gethostbyname(servername); 261 if (!hep) 262 errx(1, "%s: unknown host", servername); 263 bcopy(hep->h_addr, &server_addr, sizeof(server_addr)); 264 } 265 } else { 266 /* Get broadcast address */ 267 /* XXX - not yet */ 268 server_addr = INADDR_ANY; 269 } 270 sin_server.sin_family = AF_INET; 271 sin_server.sin_port = htons(bootps_port); 272 sin_server.sin_addr.s_addr = server_addr; 273 274 /* 275 * Get client's listening port number 276 */ 277 sep = getservbyname("bootpc", "udp"); 278 if (sep) { 279 bootpc_port = ntohs(sep->s_port); 280 } else { 281 warnx("bootpc/udp: unknown service -- using port %d", 282 IPPORT_BOOTPC); 283 bootpc_port = (u_short) IPPORT_BOOTPC; 284 } 285 286 /* 287 * Set up client socket address (for listen) 288 */ 289 sin_client.sin_family = AF_INET; 290 sin_client.sin_port = htons(bootpc_port); 291 sin_client.sin_addr.s_addr = INADDR_ANY; 292 293 /* 294 * Bind client socket to BOOTPC port. 295 */ 296 if (bind(s, (struct sockaddr *) &sin_client, sizeof(sin_client)) < 0) { 297 if (errno == EACCES) { 298 warn("bind BOOTPC port"); 299 errx(1, "you need to run this as root"); 300 } 301 else 302 err(1, "bind BOOTPC port"); 303 } 304 /* 305 * Build a request. 306 */ 307 bp = (struct bootp *) sndbuf; 308 bzero(bp, sizeof(*bp)); 309 bp->bp_op = BOOTREQUEST; 310 xid = (int32) getpid(); 311 bp->bp_xid = (u_int32) htonl(xid); 312 if (bp_file) 313 strncpy(bp->bp_file, bp_file, BP_FILE_LEN); 314 315 /* 316 * Fill in the hardware address (or client IP address) 317 */ 318 if (use_hwa) { 319 struct ifreq *ifr; 320 321 ifr = getif(s, &sin_server.sin_addr); 322 if (!ifr) { 323 printf("No interface for %s\n", servername); 324 exit(1); 325 } 326 if (getether(ifr->ifr_name, (char*)eaddr)) { 327 printf("Can not get ether addr for %s\n", ifr->ifr_name); 328 exit(1); 329 } 330 /* Copy Ethernet address into request packet. */ 331 bp->bp_htype = 1; 332 bp->bp_hlen = 6; 333 bcopy(eaddr, bp->bp_chaddr, bp->bp_hlen); 334 } else { 335 /* Fill in the client IP address. */ 336 hep = gethostbyname(hostname); 337 if (!hep) { 338 printf("Can not get my IP address\n"); 339 exit(1); 340 } 341 bcopy(hep->h_addr, &bp->bp_ciaddr, hep->h_length); 342 } 343 344 /* 345 * Copy in the default vendor data. 346 */ 347 bcopy((char*)&vend_magic, bp->bp_vend, 4); 348 if (vend_magic) 349 bp->bp_vend[4] = TAG_END; 350 351 /* 352 * Read in the "options" part of the request. 353 * This also determines the size of the packet. 354 */ 355 snaplen = sizeof(*bp); 356 if (vendor_file) { 357 int fd = open(vendor_file, 0); 358 if (fd < 0) { 359 perror(vendor_file); 360 exit(1); 361 } 362 /* Compute actual space for options. */ 363 n = BUFLEN - sizeof(*bp) + BP_VEND_LEN; 364 n = read(fd, bp->bp_vend, n); 365 close(fd); 366 if (n < 0) { 367 perror(vendor_file); 368 exit(1); 369 } 370 printf("read %d bytes of vendor template\n", n); 371 if (n > BP_VEND_LEN) { 372 printf("warning: extended options in use (len > %d)\n", 373 BP_VEND_LEN); 374 snaplen += (n - BP_VEND_LEN); 375 } 376 } 377 /* 378 * Set globals needed by print_bootp 379 * (called by send_request) 380 */ 381 packetp = (unsigned char *) eaddr; 382 snapend = (unsigned char *) sndbuf + snaplen; 383 384 /* Send a request once per second while waiting for replies. */ 385 recvcnt = 0; 386 bp->bp_secs = secs = 0; 387 send_request(s); 388 while (1) { 389 struct timeval tv; 390 int readfds; 391 392 tv.tv_sec = WAITSECS; 393 tv.tv_usec = 0L; 394 readfds = (1 << s); 395 n = select(s + 1, (fd_set *) & readfds, NULL, NULL, &tv); 396 if (n < 0) { 397 perror("select"); 398 break; 399 } 400 if (n == 0) { 401 /* 402 * We have not received a response in the last second. 403 * If we have ever received any responses, exit now. 404 * Otherwise, bump the "wait time" field and re-send. 405 */ 406 if (recvcnt > 0) 407 exit(0); 408 secs += WAITSECS; 409 if (secs > MAXWAIT) 410 break; 411 bp->bp_secs = htons(secs); 412 send_request(s); 413 continue; 414 } 415 fromlen = sizeof(sin_from); 416 n = recvfrom(s, rcvbuf, BUFLEN, 0, 417 (struct sockaddr *) &sin_from, &fromlen); 418 if (n <= 0) { 419 continue; 420 } 421 if (n < sizeof(struct bootp)) { 422 printf("received short packet\n"); 423 continue; 424 } 425 recvcnt++; 426 427 /* Print the received packet. */ 428 printf("Recvd from %s", inet_ntoa(sin_from.sin_addr)); 429 /* set globals needed by bootp_print() */ 430 snaplen = n; 431 snapend = (unsigned char *) rcvbuf + snaplen; 432 bootp_print(rcvbuf, n, sin_from.sin_port, 0); 433 putchar('\n'); 434 /* 435 * This no longer exits immediately after receiving 436 * one response because it is useful to know if the 437 * client might get multiple responses. This code 438 * will now listen for one second after a response. 439 */ 440 } 441 errx(1, "no response from %s", servername); 442 } 443 444 static void 445 send_request(s) 446 int s; 447 { 448 /* Print the request packet. */ 449 printf("Sending to %s", inet_ntoa(sin_server.sin_addr)); 450 bootp_print(sndbuf, snaplen, sin_from.sin_port, 0); 451 putchar('\n'); 452 453 /* Send the request packet. */ 454 if (sendto(s, sndbuf, snaplen, 0, 455 (struct sockaddr *) &sin_server, 456 sizeof(sin_server)) < 0) 457 { 458 perror("sendto server"); 459 exit(1); 460 } 461 } 462 463 /* 464 * Print out a filename (or other ascii string). 465 * Return true if truncated. 466 */ 467 int 468 printfn(s, ep) 469 u_char *s, *ep; 470 { 471 u_char c; 472 473 putchar('"'); 474 while ((c = *s++) != '\0') { 475 if (s > ep) { 476 putchar('"'); 477 return (1); 478 } 479 if (!isascii(c)) { 480 c = toascii(c); 481 putchar('M'); 482 putchar('-'); 483 } 484 if (!isprint(c)) { 485 c ^= 0x40; /* DEL to ?, others to alpha */ 486 putchar('^'); 487 } 488 putchar(c); 489 } 490 putchar('"'); 491 return (0); 492 } 493 494 /* 495 * Convert an IP addr to a string. 496 * (like inet_ntoa, but ina is a pointer) 497 */ 498 char * 499 ipaddr_string(ina) 500 struct in_addr *ina; 501 { 502 static char b[24]; 503 u_char *p; 504 505 p = (u_char *) ina; 506 snprintf(b, sizeof(b), "%d.%d.%d.%d", p[0], p[1], p[2], p[3]); 507 return (b); 508 } 509 510 /* 511 * Local Variables: 512 * tab-width: 4 513 * c-indent-level: 4 514 * c-argdecl-indent: 4 515 * c-continued-statement-offset: 4 516 * c-continued-brace-offset: -4 517 * c-label-offset: -4 518 * c-brace-offset: 0 519 * End: 520 */ 521