bootptest.c revision 1.20
1 /* $NetBSD: bootptest.c,v 1.20 2011/08/21 08:59:50 christos 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 1.20 2011/08/21 08:59:50 christos Exp $"); 40 #endif 41 42 static const char usage[] = 43 "Usage: %s [-f bootfile] [-h] [-m magic_number] server-name\n" 44 "\t[vendor-data-template-file]\n"; 45 46 #include <sys/param.h> 47 #include <sys/socket.h> 48 #include <sys/ioctl.h> 49 #include <sys/file.h> 50 #include <sys/time.h> 51 #include <sys/stat.h> 52 #include <sys/poll.h> 53 54 #include <net/if.h> 55 #include <netinet/in.h> 56 #include <arpa/inet.h> /* inet_ntoa */ 57 58 #include <stdlib.h> 59 #include <signal.h> 60 #include <stdio.h> 61 #include <string.h> 62 #include <strings.h> 63 #include <errno.h> 64 #include <ctype.h> 65 #include <netdb.h> 66 #include <assert.h> 67 #include <unistd.h> 68 69 #include "bootp.h" 70 #include "bootptest.h" 71 #include "getif.h" 72 #include "report.h" 73 #include "patchlevel.h" 74 75 #define LOG_ERR 1 76 #define BUFLEN 1024 77 #define WAITSECS 1 78 #define MAXWAIT 10 79 80 int vflag = 1; 81 int tflag = 0; 82 int thiszone; 83 char *progname; 84 unsigned char *packetp; 85 unsigned char *snapend; 86 int snaplen; 87 88 89 /* 90 * IP port numbers for client and server obtained from /etc/services 91 */ 92 93 u_short bootps_port, bootpc_port; 94 95 96 /* 97 * Internet socket and interface config structures 98 */ 99 100 struct sockaddr_in sin_server; /* where to send requests */ 101 struct sockaddr_in sin_client; /* for bind and listen */ 102 struct sockaddr_in sin_from; /* Packet source */ 103 u_char eaddr[16]; /* Ethernet address */ 104 105 /* 106 * General 107 */ 108 109 int debug = 1; /* Debugging flag (level) */ 110 char hostname[MAXHOSTNAMELEN + 1]; 111 char *sndbuf; /* Send packet buffer */ 112 char *rcvbuf; /* Receive packet buffer */ 113 114 /* 115 * Vendor magic cookies for CMU and RFC1048 116 */ 117 118 unsigned char vm_cmu[4] = VM_CMU; 119 unsigned char vm_rfc1048[4] = VM_RFC1048; 120 short secs; /* How long client has waited */ 121 122 123 extern int getether(char *, char *); 124 int main(int, char **); 125 void send_request(int); 126 127 /* 128 * Initialization such as command-line processing is done, then 129 * the receiver loop is started. Die when interrupted. 130 */ 131 132 int 133 main(int argc, char **argv) 134 { 135 struct bootp *bp; 136 struct servent *sep; 137 struct hostent *hep; 138 139 char *servername = NULL; 140 char *vendor_file = NULL; 141 char *bp_file = NULL; 142 socklen_t fromlen; 143 int s; /* Socket file descriptor */ 144 int n, recvcnt; 145 int use_hwa = 0; 146 int32 vend_magic; 147 int32 xid; 148 struct pollfd set[1]; 149 150 progname = strrchr(argv[0], '/'); 151 if (progname) 152 progname++; 153 else 154 progname = argv[0]; 155 argc--; 156 argv++; 157 158 if (debug) 159 printf("%s: version %s.%d\n", progname, VERSION, PATCHLEVEL); 160 161 /* 162 * Verify that "struct bootp" has the correct official size. 163 * (Catch evil compilers that do struct padding.) 164 */ 165 assert(sizeof(struct bootp) == BP_MINPKTSZ); 166 167 sndbuf = malloc(BUFLEN); 168 rcvbuf = malloc(BUFLEN); 169 if (!sndbuf || !rcvbuf) { 170 printf("malloc failed\n"); 171 exit(1); 172 } 173 174 /* default magic number */ 175 bcopy(vm_rfc1048, (char*)&vend_magic, 4); 176 177 /* Handle option switches. */ 178 while (argc > 0) { 179 if (argv[0][0] != '-') 180 break; 181 switch (argv[0][1]) { 182 183 case 'f': /* File name to reqest. */ 184 if (argc < 2) 185 goto error; 186 argc--; argv++; 187 bp_file = *argv; 188 break; 189 190 case 'h': /* Use hardware address. */ 191 use_hwa = 1; 192 break; 193 194 case 'm': /* Magic number value. */ 195 if (argc < 2) 196 goto error; 197 argc--; argv++; 198 vend_magic = inet_addr(*argv); 199 break; 200 201 error: 202 default: 203 (void)fprintf(stderr, usage, getprogname()); 204 exit(1); 205 206 } 207 argc--; 208 argv++; 209 } 210 211 /* Get server name (or address) for query. */ 212 if (argc > 0) { 213 servername = *argv; 214 argc--; 215 argv++; 216 } 217 /* Get optional vendor-data-template-file. */ 218 if (argc > 0) { 219 vendor_file = *argv; 220 argc--; 221 argv++; 222 } 223 if (!servername) { 224 printf("missing server name.\n"); 225 (void)fprintf(stderr, usage, getprogname()); 226 exit(1); 227 } 228 /* 229 * Create a socket. 230 */ 231 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 232 perror("socket"); 233 exit(1); 234 } 235 /* 236 * Get server's listening port number 237 */ 238 sep = getservbyname("bootps", "udp"); 239 if (sep) { 240 bootps_port = ntohs((u_short) sep->s_port); 241 } else { 242 fprintf(stderr, "udp/bootps: unknown service -- using port %d\n", 243 IPPORT_BOOTPS); 244 bootps_port = (u_short) IPPORT_BOOTPS; 245 } 246 247 /* 248 * Set up server socket address (for send) 249 */ 250 if (servername) { 251 if (inet_aton(servername, &sin_server.sin_addr) == 0) { 252 hep = gethostbyname(servername); 253 if (!hep) { 254 fprintf(stderr, "%s: unknown host\n", servername); 255 exit(1); 256 } 257 memcpy(&sin_server.sin_addr, hep->h_addr, 258 sizeof(sin_server.sin_addr)); 259 } 260 } else { 261 /* Get broadcast address */ 262 /* XXX - not yet */ 263 sin_server.sin_addr.s_addr = INADDR_ANY; 264 } 265 sin_server.sin_family = AF_INET; 266 sin_server.sin_port = htons(bootps_port); 267 268 /* 269 * Get client's listening port number 270 */ 271 sep = getservbyname("bootpc", "udp"); 272 if (sep) { 273 bootpc_port = ntohs(sep->s_port); 274 } else { 275 fprintf(stderr, "udp/bootpc: unknown service -- using port %d\n", 276 IPPORT_BOOTPC); 277 bootpc_port = (u_short) IPPORT_BOOTPC; 278 } 279 280 /* 281 * Set up client socket address (for listen) 282 */ 283 sin_client.sin_family = AF_INET; 284 sin_client.sin_port = htons(bootpc_port); 285 sin_client.sin_addr.s_addr = INADDR_ANY; 286 287 /* 288 * Bind client socket to BOOTPC port. 289 */ 290 if (bind(s, (struct sockaddr *) &sin_client, sizeof(sin_client)) < 0) { 291 perror("bind BOOTPC port"); 292 if (errno == EACCES) 293 fprintf(stderr, "You need to run this as root\n"); 294 exit(1); 295 } 296 /* 297 * Build a request. 298 */ 299 bp = (struct bootp *) sndbuf; 300 bzero(bp, sizeof(*bp)); 301 bp->bp_op = BOOTREQUEST; 302 xid = (int32) getpid(); 303 bp->bp_xid = (u_int32) htonl(xid); 304 if (bp_file) 305 strlcpy(bp->bp_file, bp_file, sizeof(bp->bp_file)); 306 307 /* 308 * Fill in the hardware address (or client IP address) 309 */ 310 if (use_hwa) { 311 struct ifreq *ifr; 312 313 ifr = getif(s, &sin_server.sin_addr); 314 if (!ifr) { 315 printf("No interface for %s\n", servername); 316 exit(1); 317 } 318 if (getether(ifr->ifr_name, (char *)eaddr)) { 319 printf("Can not get ether addr for %s\n", ifr->ifr_name); 320 exit(1); 321 } 322 /* Copy Ethernet address into request packet. */ 323 bp->bp_htype = 1; 324 bp->bp_hlen = 6; 325 bcopy(eaddr, bp->bp_chaddr, bp->bp_hlen); 326 } else { 327 /* Fill in the client IP address. */ 328 gethostname(hostname, sizeof(hostname)); 329 hostname[sizeof(hostname) - 1] = '\0'; 330 hep = gethostbyname(hostname); 331 if (!hep) { 332 printf("Can not get my IP address\n"); 333 exit(1); 334 } 335 bcopy(hep->h_addr, &bp->bp_ciaddr, hep->h_length); 336 } 337 338 /* 339 * Copy in the default vendor data. 340 */ 341 bcopy((char*)&vend_magic, bp->bp_vend, 4); 342 if (vend_magic) 343 bp->bp_vend[4] = TAG_END; 344 345 /* 346 * Read in the "options" part of the request. 347 * This also determines the size of the packet. 348 */ 349 snaplen = sizeof(*bp); 350 if (vendor_file) { 351 int fd = open(vendor_file, 0); 352 if (fd < 0) { 353 perror(vendor_file); 354 exit(1); 355 } 356 /* Compute actual space for options. */ 357 n = BUFLEN - sizeof(*bp) + BP_VEND_LEN; 358 n = read(fd, bp->bp_vend, n); 359 close(fd); 360 if (n < 0) { 361 perror(vendor_file); 362 exit(1); 363 } 364 printf("read %d bytes of vendor template\n", n); 365 if (n > BP_VEND_LEN) { 366 printf("warning: extended options in use (len > %d)\n", 367 BP_VEND_LEN); 368 snaplen += (n - BP_VEND_LEN); 369 } 370 } 371 /* 372 * Set globals needed by print_bootp 373 * (called by send_request) 374 */ 375 packetp = (unsigned char *) eaddr; 376 snapend = (unsigned char *) sndbuf + snaplen; 377 378 /* Send a request once per second while waiting for replies. */ 379 recvcnt = 0; 380 bp->bp_secs = secs = 0; 381 send_request(s); 382 set[0].fd = s; 383 set[0].events = POLLIN; 384 while (1) { 385 n = poll(set, 1, WAITSECS * 1000); 386 if (n < 0) { 387 perror("poll"); 388 break; 389 } 390 if (n == 0) { 391 /* 392 * We have not received a response in the last second. 393 * If we have ever received any responses, exit now. 394 * Otherwise, bump the "wait time" field and re-send. 395 */ 396 if (recvcnt > 0) 397 exit(0); 398 secs += WAITSECS; 399 if (secs > MAXWAIT) 400 break; 401 bp->bp_secs = htons(secs); 402 send_request(s); 403 continue; 404 } 405 fromlen = sizeof(sin_from); 406 n = recvfrom(s, rcvbuf, BUFLEN, 0, 407 (struct sockaddr *) &sin_from, &fromlen); 408 if (n <= 0) { 409 continue; 410 } 411 if (n < (int)sizeof(struct bootp)) { 412 printf("received short packet\n"); 413 continue; 414 } 415 recvcnt++; 416 417 /* Print the received packet. */ 418 printf("Recvd from %s", inet_ntoa(sin_from.sin_addr)); 419 /* set globals needed by bootp_print() */ 420 snaplen = n; 421 snapend = (unsigned char *) rcvbuf + snaplen; 422 bootp_print((struct bootp *)rcvbuf, n, sin_from.sin_port, 0); 423 putchar('\n'); 424 /* 425 * This no longer exits immediately after receiving 426 * one response because it is useful to know if the 427 * client might get multiple responses. This code 428 * will now listen for one second after a response. 429 */ 430 } 431 fprintf(stderr, "no response from %s\n", servername); 432 exit(1); 433 } 434 435 void 436 send_request(int s) 437 { 438 /* Print the request packet. */ 439 printf("Sending to %s", inet_ntoa(sin_server.sin_addr)); 440 bootp_print((struct bootp *)sndbuf, snaplen, sin_from.sin_port, 0); 441 putchar('\n'); 442 443 /* Send the request packet. */ 444 if (sendto(s, sndbuf, snaplen, 0, 445 (struct sockaddr *) &sin_server, 446 sizeof(sin_server)) < 0) 447 { 448 perror("sendto server"); 449 exit(1); 450 } 451 } 452 453 /* 454 * Print out a filename (or other ascii string). 455 * Return true if truncated. 456 */ 457 int 458 printfn(u_char *s, u_char *ep) 459 { 460 u_char c; 461 462 putchar('"'); 463 while ((c = *s++) != 0) { 464 if (s > ep) { 465 putchar('"'); 466 return (1); 467 } 468 if (!isascii(c)) { 469 c = toascii(c); 470 putchar('M'); 471 putchar('-'); 472 } 473 if (!isprint(c)) { 474 c ^= 0x40; /* DEL to ?, others to alpha */ 475 putchar('^'); 476 } 477 putchar(c); 478 } 479 putchar('"'); 480 return (0); 481 } 482 483 /* 484 * Convert an IP addr to a string. 485 * (like inet_ntoa, but ina is a pointer) 486 */ 487 char * 488 ipaddr_string(struct in_addr *ina) 489 { 490 static char b[24]; 491 u_char *p; 492 493 p = (u_char *) ina; 494 snprintf(b, sizeof(b), "%d.%d.%d.%d", p[0], p[1], p[2], p[3]); 495 return (b); 496 } 497 498 /* 499 * Local Variables: 500 * tab-width: 4 501 * c-indent-level: 4 502 * c-argdecl-indent: 4 503 * c-continued-statement-offset: 4 504 * c-continued-brace-offset: -4 505 * c-label-offset: -4 506 * c-brace-offset: 0 507 * End: 508 */ 509
Indexes created Wed Sep 24 05:09:52 GMT 2025