bootptest.c revision 1.6
1 /* $NetBSD: bootptest.c,v 1.6 1998/07/06 07:02:17 mrg Exp $ */ 2 3 /* 4 * bootptest.c - Test out a bootp server. 5 * 6 * This simple program was put together from pieces taken from 7 * various places, including the CMU BOOTP client and server. 8 * The packet printing routine is from the Berkeley "tcpdump" 9 * program with some enhancements I added. The print-bootp.c 10 * file was shared with my copy of "tcpdump" and therefore uses 11 * some unusual utility routines that would normally be provided 12 * by various parts of the tcpdump program. Gordon W. Ross 13 * 14 * Boilerplate: 15 * 16 * This program includes software developed by the University of 17 * California, Lawrence Berkeley Laboratory and its contributors. 18 * (See the copyright notice in print-bootp.c) 19 * 20 * The remainder of this program is public domain. You may do 21 * whatever you like with it except claim that you wrote it. 22 * 23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 26 * 27 * HISTORY: 28 * 29 * 12/02/93 Released version 1.4 (with bootp-2.3.2) 30 * 11/05/93 Released version 1.3 31 * 10/14/93 Released version 1.2 32 * 10/11/93 Released version 1.1 33 * 09/28/93 Released version 1.0 34 * 09/93 Original developed by Gordon W. Ross <gwr (at) mc.com> 35 */ 36 37 #include <sys/cdefs.h> 38 #ifndef lint 39 __RCSID("$NetBSD: bootptest.c,v 1.6 1998/07/06 07:02:17 mrg Exp $"); 40 #endif 41 42 char *usage = "bootptest [-h] server-name [vendor-data-template-file]"; 43 44 #include <sys/types.h> 45 #include <sys/socket.h> 46 #include <sys/ioctl.h> 47 #include <sys/file.h> 48 #include <sys/time.h> 49 #include <sys/stat.h> 50 51 #include <net/if.h> 52 #include <netinet/in.h> 53 #include <arpa/inet.h> /* inet_ntoa */ 54 55 #include <stdlib.h> 56 #include <signal.h> 57 #include <stdio.h> 58 #include <string.h> 59 #include <errno.h> 60 #include <ctype.h> 61 #include <netdb.h> 62 #include <assert.h> 63 #include <unistd.h> 64 65 #include "bootp.h" 66 #include "bootptest.h" 67 #include "getif.h" 68 #include "report.h" 69 #include "patchlevel.h" 70 71 #define LOG_ERR 1 72 #define BUFLEN 1024 73 #define WAITSECS 1 74 #define MAXWAIT 10 75 76 int vflag = 1; 77 int tflag = 0; 78 int thiszone; 79 char *progname; 80 unsigned char *packetp; 81 unsigned char *snapend; 82 int snaplen; 83 84 85 /* 86 * IP port numbers for client and server obtained from /etc/services 87 */ 88 89 u_short bootps_port, bootpc_port; 90 91 92 /* 93 * Internet socket and interface config structures 94 */ 95 96 struct sockaddr_in sin_server; /* where to send requests */ 97 struct sockaddr_in sin_client; /* for bind and listen */ 98 struct sockaddr_in sin_from; /* Packet source */ 99 u_char eaddr[16]; /* Ethernet address */ 100 101 /* 102 * General 103 */ 104 105 int debug = 1; /* Debugging flag (level) */ 106 char hostname[MAXHOSTNAMELEN + 1]; 107 char *sndbuf; /* Send packet buffer */ 108 char *rcvbuf; /* Receive packet buffer */ 109 110 /* 111 * Vendor magic cookies for CMU and RFC1048 112 */ 113 114 unsigned char vm_cmu[4] = VM_CMU; 115 unsigned char vm_rfc1048[4] = VM_RFC1048; 116 short secs; /* How long client has waited */ 117 118 119 #ifdef __STDC__ 120 #define P(args) args 121 #else 122 #define P(args) () 123 #endif 124 125 extern int getether P((char *, char *)); 126 int main P((int, char **)); 127 void send_request P((int)); 128 129 #undef P 130 131 /* 132 * Initialization such as command-line processing is done, then 133 * the receiver loop is started. Die when interrupted. 134 */ 135 136 int 137 main(argc, argv) 138 int argc; 139 char **argv; 140 { 141 struct bootp *bp; 142 struct servent *sep; 143 struct hostent *hep; 144 145 char *servername = NULL; 146 char *vendor_file = NULL; 147 char *bp_file = NULL; 148 int s; /* Socket file descriptor */ 149 int n, fromlen, recvcnt; 150 int use_hwa = 0; 151 int32 vend_magic; 152 int32 xid; 153 154 progname = strrchr(argv[0], '/'); 155 if (progname) 156 progname++; 157 else 158 progname = argv[0]; 159 argc--; 160 argv++; 161 162 if (debug) 163 printf("%s: version %s.%d\n", progname, VERSION, PATCHLEVEL); 164 165 /* 166 * Verify that "struct bootp" has the correct official size. 167 * (Catch evil compilers that do struct padding.) 168 */ 169 assert(sizeof(struct bootp) == BP_MINPKTSZ); 170 171 sndbuf = malloc(BUFLEN); 172 rcvbuf = malloc(BUFLEN); 173 if (!sndbuf || !rcvbuf) { 174 printf("malloc failed\n"); 175 exit(1); 176 } 177 178 /* default magic number */ 179 bcopy(vm_rfc1048, (char*)&vend_magic, 4); 180 181 /* Handle option switches. */ 182 while (argc > 0) { 183 if (argv[0][0] != '-') 184 break; 185 switch (argv[0][1]) { 186 187 case 'f': /* File name to reqest. */ 188 if (argc < 2) 189 goto error; 190 argc--; argv++; 191 bp_file = *argv; 192 break; 193 194 case 'h': /* Use hardware address. */ 195 use_hwa = 1; 196 break; 197 198 case 'm': /* Magic number value. */ 199 if (argc < 2) 200 goto error; 201 argc--; argv++; 202 vend_magic = inet_addr(*argv); 203 break; 204 205 error: 206 default: 207 puts(usage); 208 exit(1); 209 210 } 211 argc--; 212 argv++; 213 } 214 215 /* Get server name (or address) for query. */ 216 if (argc > 0) { 217 servername = *argv; 218 argc--; 219 argv++; 220 } 221 /* Get optional vendor-data-template-file. */ 222 if (argc > 0) { 223 vendor_file = *argv; 224 argc--; 225 argv++; 226 } 227 if (!servername) { 228 printf("missing server name.\n"); 229 puts(usage); 230 exit(1); 231 } 232 /* 233 * Create a socket. 234 */ 235 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 236 perror("socket"); 237 exit(1); 238 } 239 /* 240 * Get server's listening port number 241 */ 242 sep = getservbyname("bootps", "udp"); 243 if (sep) { 244 bootps_port = ntohs((u_short) sep->s_port); 245 } else { 246 fprintf(stderr, "udp/bootps: unknown service -- using port %d\n", 247 IPPORT_BOOTPS); 248 bootps_port = (u_short) IPPORT_BOOTPS; 249 } 250 251 /* 252 * Set up server socket address (for send) 253 */ 254 if (servername) { 255 if (inet_aton(servername, &sin_server.sin_addr) == 0) { 256 hep = gethostbyname(servername); 257 if (!hep) { 258 fprintf(stderr, "%s: unknown host\n", servername); 259 exit(1); 260 } 261 memcpy(&sin_server.sin_addr, hep->h_addr, 262 sizeof(sin_server.sin_addr)); 263 } 264 } else { 265 /* Get broadcast address */ 266 /* XXX - not yet */ 267 sin_server.sin_addr.s_addr = INADDR_ANY; 268 } 269 sin_server.sin_family = AF_INET; 270 sin_server.sin_port = htons(bootps_port); 271 272 /* 273 * Get client's listening port number 274 */ 275 sep = getservbyname("bootpc", "udp"); 276 if (sep) { 277 bootpc_port = ntohs(sep->s_port); 278 } else { 279 fprintf(stderr, "udp/bootpc: unknown service -- using port %d\n", 280 IPPORT_BOOTPC); 281 bootpc_port = (u_short) IPPORT_BOOTPC; 282 } 283 284 /* 285 * Set up client socket address (for listen) 286 */ 287 sin_client.sin_family = AF_INET; 288 sin_client.sin_port = htons(bootpc_port); 289 sin_client.sin_addr.s_addr = INADDR_ANY; 290 291 /* 292 * Bind client socket to BOOTPC port. 293 */ 294 if (bind(s, (struct sockaddr *) &sin_client, sizeof(sin_client)) < 0) { 295 perror("bind BOOTPC port"); 296 if (errno == EACCES) 297 fprintf(stderr, "You need to run this as root\n"); 298 exit(1); 299 } 300 /* 301 * Build a request. 302 */ 303 bp = (struct bootp *) sndbuf; 304 bzero(bp, sizeof(*bp)); 305 bp->bp_op = BOOTREQUEST; 306 xid = (int32) getpid(); 307 bp->bp_xid = (u_int32) htonl(xid); 308 if (bp_file) 309 strncpy(bp->bp_file, bp_file, BP_FILE_LEN); 310 311 /* 312 * Fill in the hardware address (or client IP address) 313 */ 314 if (use_hwa) { 315 struct ifreq *ifr; 316 317 ifr = getif(s, &sin_server.sin_addr); 318 if (!ifr) { 319 printf("No interface for %s\n", servername); 320 exit(1); 321 } 322 if (getether(ifr->ifr_name, eaddr)) { 323 printf("Can not get ether addr for %s\n", ifr->ifr_name); 324 exit(1); 325 } 326 /* Copy Ethernet address into request packet. */ 327 bp->bp_htype = 1; 328 bp->bp_hlen = 6; 329 bcopy(eaddr, bp->bp_chaddr, bp->bp_hlen); 330 } else { 331 /* Fill in the client IP address. */ 332 gethostname(hostname, sizeof(hostname)); 333 hostname[sizeof(hostname) - 1] = '\0'; 334 hep = gethostbyname(hostname); 335 if (!hep) { 336 printf("Can not get my IP address\n"); 337 exit(1); 338 } 339 bcopy(hep->h_addr, &bp->bp_ciaddr, hep->h_length); 340 } 341 342 /* 343 * Copy in the default vendor data. 344 */ 345 bcopy((char*)&vend_magic, bp->bp_vend, 4); 346 if (vend_magic) 347 bp->bp_vend[4] = TAG_END; 348 349 /* 350 * Read in the "options" part of the request. 351 * This also determines the size of the packet. 352 */ 353 snaplen = sizeof(*bp); 354 if (vendor_file) { 355 int fd = open(vendor_file, 0); 356 if (fd < 0) { 357 perror(vendor_file); 358 exit(1); 359 } 360 /* Compute actual space for options. */ 361 n = BUFLEN - sizeof(*bp) + BP_VEND_LEN; 362 n = read(fd, bp->bp_vend, n); 363 close(fd); 364 if (n < 0) { 365 perror(vendor_file); 366 exit(1); 367 } 368 printf("read %d bytes of vendor template\n", n); 369 if (n > BP_VEND_LEN) { 370 printf("warning: extended options in use (len > %d)\n", 371 BP_VEND_LEN); 372 snaplen += (n - BP_VEND_LEN); 373 } 374 } 375 /* 376 * Set globals needed by print_bootp 377 * (called by send_request) 378 */ 379 packetp = (unsigned char *) eaddr; 380 snapend = (unsigned char *) sndbuf + snaplen; 381 382 /* Send a request once per second while waiting for replies. */ 383 recvcnt = 0; 384 bp->bp_secs = secs = 0; 385 send_request(s); 386 while (1) { 387 struct timeval tv; 388 int readfds; 389 390 tv.tv_sec = WAITSECS; 391 tv.tv_usec = 0L; 392 readfds = (1 << s); 393 n = select(s + 1, (fd_set *) & readfds, NULL, NULL, &tv); 394 if (n < 0) { 395 perror("select"); 396 break; 397 } 398 if (n == 0) { 399 /* 400 * We have not received a response in the last second. 401 * If we have ever received any responses, exit now. 402 * Otherwise, bump the "wait time" field and re-send. 403 */ 404 if (recvcnt > 0) 405 exit(0); 406 secs += WAITSECS; 407 if (secs > MAXWAIT) 408 break; 409 bp->bp_secs = htons(secs); 410 send_request(s); 411 continue; 412 } 413 fromlen = sizeof(sin_from); 414 n = recvfrom(s, rcvbuf, BUFLEN, 0, 415 (struct sockaddr *) &sin_from, &fromlen); 416 if (n <= 0) { 417 continue; 418 } 419 if (n < sizeof(struct bootp)) { 420 printf("received short packet\n"); 421 continue; 422 } 423 recvcnt++; 424 425 /* Print the received packet. */ 426 printf("Recvd from %s", inet_ntoa(sin_from.sin_addr)); 427 /* set globals needed by bootp_print() */ 428 snaplen = n; 429 snapend = (unsigned char *) rcvbuf + snaplen; 430 bootp_print((struct bootp *)rcvbuf, n, sin_from.sin_port, 0); 431 putchar('\n'); 432 /* 433 * This no longer exits immediately after receiving 434 * one response because it is useful to know if the 435 * client might get multiple responses. This code 436 * will now listen for one second after a response. 437 */ 438 } 439 fprintf(stderr, "no response from %s\n", servername); 440 exit(1); 441 } 442 443 void 444 send_request(s) 445 int s; 446 { 447 /* Print the request packet. */ 448 printf("Sending to %s", inet_ntoa(sin_server.sin_addr)); 449 bootp_print((struct bootp *)sndbuf, snaplen, sin_from.sin_port, 0); 450 putchar('\n'); 451 452 /* Send the request packet. */ 453 if (sendto(s, sndbuf, snaplen, 0, 454 (struct sockaddr *) &sin_server, 455 sizeof(sin_server)) < 0) 456 { 457 perror("sendto server"); 458 exit(1); 459 } 460 } 461 462 /* 463 * Print out a filename (or other ascii string). 464 * Return true if truncated. 465 */ 466 int 467 printfn(s, ep) 468 register u_char *s, *ep; 469 { 470 register u_char c; 471 472 putchar('"'); 473 while ((c = *s++) != 0) { 474 if (s > ep) { 475 putchar('"'); 476 return (1); 477 } 478 if (!isascii(c)) { 479 c = toascii(c); 480 putchar('M'); 481 putchar('-'); 482 } 483 if (!isprint(c)) { 484 c ^= 0x40; /* DEL to ?, others to alpha */ 485 putchar('^'); 486 } 487 putchar(c); 488 } 489 putchar('"'); 490 return (0); 491 } 492 493 /* 494 * Convert an IP addr to a string. 495 * (like inet_ntoa, but ina is a pointer) 496 */ 497 char * 498 ipaddr_string(ina) 499 struct in_addr *ina; 500 { 501 static char b[24]; 502 u_char *p; 503 504 p = (u_char *) ina; 505 sprintf(b, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]); 506 return (b); 507 } 508 509 /* 510 * Local Variables: 511 * tab-width: 4 512 * c-indent-level: 4 513 * c-argdecl-indent: 4 514 * c-continued-statement-offset: 4 515 * c-continued-brace-offset: -4 516 * c-label-offset: -4 517 * c-brace-offset: 0 518 * End: 519 */ 520
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