bootptest.c revision 1.9
1 /* $NetBSD: bootptest.c,v 1.9 2002/07/14 00:30:02 wiz 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 1.9 2002/07/14 00:30:02 wiz Exp $"); 40 #endif 41 42 char *usage = "bootptest [-h] server-name [vendor-data-template-file]"; 43 44 #include <sys/param.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 extern int getether(char *, char *); 120 int main(int, char **); 121 void send_request(int); 122 123 /* 124 * Initialization such as command-line processing is done, then 125 * the receiver loop is started. Die when interrupted. 126 */ 127 128 int 129 main(int argc, char **argv) 130 { 131 struct bootp *bp; 132 struct servent *sep; 133 struct hostent *hep; 134 135 char *servername = NULL; 136 char *vendor_file = NULL; 137 char *bp_file = NULL; 138 int s; /* Socket file descriptor */ 139 int n, fromlen, recvcnt; 140 int use_hwa = 0; 141 int32 vend_magic; 142 int32 xid; 143 144 progname = strrchr(argv[0], '/'); 145 if (progname) 146 progname++; 147 else 148 progname = argv[0]; 149 argc--; 150 argv++; 151 152 if (debug) 153 printf("%s: version %s.%d\n", progname, VERSION, PATCHLEVEL); 154 155 /* 156 * Verify that "struct bootp" has the correct official size. 157 * (Catch evil compilers that do struct padding.) 158 */ 159 assert(sizeof(struct bootp) == BP_MINPKTSZ); 160 161 sndbuf = malloc(BUFLEN); 162 rcvbuf = malloc(BUFLEN); 163 if (!sndbuf || !rcvbuf) { 164 printf("malloc failed\n"); 165 exit(1); 166 } 167 168 /* default magic number */ 169 bcopy(vm_rfc1048, (char*)&vend_magic, 4); 170 171 /* Handle option switches. */ 172 while (argc > 0) { 173 if (argv[0][0] != '-') 174 break; 175 switch (argv[0][1]) { 176 177 case 'f': /* File name to reqest. */ 178 if (argc < 2) 179 goto error; 180 argc--; argv++; 181 bp_file = *argv; 182 break; 183 184 case 'h': /* Use hardware address. */ 185 use_hwa = 1; 186 break; 187 188 case 'm': /* Magic number value. */ 189 if (argc < 2) 190 goto error; 191 argc--; argv++; 192 vend_magic = inet_addr(*argv); 193 break; 194 195 error: 196 default: 197 puts(usage); 198 exit(1); 199 200 } 201 argc--; 202 argv++; 203 } 204 205 /* Get server name (or address) for query. */ 206 if (argc > 0) { 207 servername = *argv; 208 argc--; 209 argv++; 210 } 211 /* Get optional vendor-data-template-file. */ 212 if (argc > 0) { 213 vendor_file = *argv; 214 argc--; 215 argv++; 216 } 217 if (!servername) { 218 printf("missing server name.\n"); 219 puts(usage); 220 exit(1); 221 } 222 /* 223 * Create a socket. 224 */ 225 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 226 perror("socket"); 227 exit(1); 228 } 229 /* 230 * Get server's listening port number 231 */ 232 sep = getservbyname("bootps", "udp"); 233 if (sep) { 234 bootps_port = ntohs((u_short) sep->s_port); 235 } else { 236 fprintf(stderr, "udp/bootps: unknown service -- using port %d\n", 237 IPPORT_BOOTPS); 238 bootps_port = (u_short) IPPORT_BOOTPS; 239 } 240 241 /* 242 * Set up server socket address (for send) 243 */ 244 if (servername) { 245 if (inet_aton(servername, &sin_server.sin_addr) == 0) { 246 hep = gethostbyname(servername); 247 if (!hep) { 248 fprintf(stderr, "%s: unknown host\n", servername); 249 exit(1); 250 } 251 memcpy(&sin_server.sin_addr, hep->h_addr, 252 sizeof(sin_server.sin_addr)); 253 } 254 } else { 255 /* Get broadcast address */ 256 /* XXX - not yet */ 257 sin_server.sin_addr.s_addr = INADDR_ANY; 258 } 259 sin_server.sin_family = AF_INET; 260 sin_server.sin_port = htons(bootps_port); 261 262 /* 263 * Get client's listening port number 264 */ 265 sep = getservbyname("bootpc", "udp"); 266 if (sep) { 267 bootpc_port = ntohs(sep->s_port); 268 } else { 269 fprintf(stderr, "udp/bootpc: unknown service -- using port %d\n", 270 IPPORT_BOOTPC); 271 bootpc_port = (u_short) IPPORT_BOOTPC; 272 } 273 274 /* 275 * Set up client socket address (for listen) 276 */ 277 sin_client.sin_family = AF_INET; 278 sin_client.sin_port = htons(bootpc_port); 279 sin_client.sin_addr.s_addr = INADDR_ANY; 280 281 /* 282 * Bind client socket to BOOTPC port. 283 */ 284 if (bind(s, (struct sockaddr *) &sin_client, sizeof(sin_client)) < 0) { 285 perror("bind BOOTPC port"); 286 if (errno == EACCES) 287 fprintf(stderr, "You need to run this as root\n"); 288 exit(1); 289 } 290 /* 291 * Build a request. 292 */ 293 bp = (struct bootp *) sndbuf; 294 bzero(bp, sizeof(*bp)); 295 bp->bp_op = BOOTREQUEST; 296 xid = (int32) getpid(); 297 bp->bp_xid = (u_int32) htonl(xid); 298 if (bp_file) 299 strncpy(bp->bp_file, bp_file, BP_FILE_LEN); 300 301 /* 302 * Fill in the hardware address (or client IP address) 303 */ 304 if (use_hwa) { 305 struct ifreq *ifr; 306 307 ifr = getif(s, &sin_server.sin_addr); 308 if (!ifr) { 309 printf("No interface for %s\n", servername); 310 exit(1); 311 } 312 if (getether(ifr->ifr_name, eaddr)) { 313 printf("Can not get ether addr for %s\n", ifr->ifr_name); 314 exit(1); 315 } 316 /* Copy Ethernet address into request packet. */ 317 bp->bp_htype = 1; 318 bp->bp_hlen = 6; 319 bcopy(eaddr, bp->bp_chaddr, bp->bp_hlen); 320 } else { 321 /* Fill in the client IP address. */ 322 gethostname(hostname, sizeof(hostname)); 323 hostname[sizeof(hostname) - 1] = '\0'; 324 hep = gethostbyname(hostname); 325 if (!hep) { 326 printf("Can not get my IP address\n"); 327 exit(1); 328 } 329 bcopy(hep->h_addr, &bp->bp_ciaddr, hep->h_length); 330 } 331 332 /* 333 * Copy in the default vendor data. 334 */ 335 bcopy((char*)&vend_magic, bp->bp_vend, 4); 336 if (vend_magic) 337 bp->bp_vend[4] = TAG_END; 338 339 /* 340 * Read in the "options" part of the request. 341 * This also determines the size of the packet. 342 */ 343 snaplen = sizeof(*bp); 344 if (vendor_file) { 345 int fd = open(vendor_file, 0); 346 if (fd < 0) { 347 perror(vendor_file); 348 exit(1); 349 } 350 /* Compute actual space for options. */ 351 n = BUFLEN - sizeof(*bp) + BP_VEND_LEN; 352 n = read(fd, bp->bp_vend, n); 353 close(fd); 354 if (n < 0) { 355 perror(vendor_file); 356 exit(1); 357 } 358 printf("read %d bytes of vendor template\n", n); 359 if (n > BP_VEND_LEN) { 360 printf("warning: extended options in use (len > %d)\n", 361 BP_VEND_LEN); 362 snaplen += (n - BP_VEND_LEN); 363 } 364 } 365 /* 366 * Set globals needed by print_bootp 367 * (called by send_request) 368 */ 369 packetp = (unsigned char *) eaddr; 370 snapend = (unsigned char *) sndbuf + snaplen; 371 372 /* Send a request once per second while waiting for replies. */ 373 recvcnt = 0; 374 bp->bp_secs = secs = 0; 375 send_request(s); 376 while (1) { 377 struct timeval tv; 378 int readfds; 379 380 tv.tv_sec = WAITSECS; 381 tv.tv_usec = 0L; 382 readfds = (1 << s); 383 n = select(s + 1, (fd_set *) & readfds, NULL, NULL, &tv); 384 if (n < 0) { 385 perror("select"); 386 break; 387 } 388 if (n == 0) { 389 /* 390 * We have not received a response in the last second. 391 * If we have ever received any responses, exit now. 392 * Otherwise, bump the "wait time" field and re-send. 393 */ 394 if (recvcnt > 0) 395 exit(0); 396 secs += WAITSECS; 397 if (secs > MAXWAIT) 398 break; 399 bp->bp_secs = htons(secs); 400 send_request(s); 401 continue; 402 } 403 fromlen = sizeof(sin_from); 404 n = recvfrom(s, rcvbuf, BUFLEN, 0, 405 (struct sockaddr *) &sin_from, &fromlen); 406 if (n <= 0) { 407 continue; 408 } 409 if (n < sizeof(struct bootp)) { 410 printf("received short packet\n"); 411 continue; 412 } 413 recvcnt++; 414 415 /* Print the received packet. */ 416 printf("Recvd from %s", inet_ntoa(sin_from.sin_addr)); 417 /* set globals needed by bootp_print() */ 418 snaplen = n; 419 snapend = (unsigned char *) rcvbuf + snaplen; 420 bootp_print((struct bootp *)rcvbuf, n, sin_from.sin_port, 0); 421 putchar('\n'); 422 /* 423 * This no longer exits immediately after receiving 424 * one response because it is useful to know if the 425 * client might get multiple responses. This code 426 * will now listen for one second after a response. 427 */ 428 } 429 fprintf(stderr, "no response from %s\n", servername); 430 exit(1); 431 } 432 433 void 434 send_request(int s) 435 { 436 /* Print the request packet. */ 437 printf("Sending to %s", inet_ntoa(sin_server.sin_addr)); 438 bootp_print((struct bootp *)sndbuf, snaplen, sin_from.sin_port, 0); 439 putchar('\n'); 440 441 /* Send the request packet. */ 442 if (sendto(s, sndbuf, snaplen, 0, 443 (struct sockaddr *) &sin_server, 444 sizeof(sin_server)) < 0) 445 { 446 perror("sendto server"); 447 exit(1); 448 } 449 } 450 451 /* 452 * Print out a filename (or other ascii string). 453 * Return true if truncated. 454 */ 455 int 456 printfn(u_char *s, u_char *ep) 457 { 458 u_char c; 459 460 putchar('"'); 461 while ((c = *s++) != 0) { 462 if (s > ep) { 463 putchar('"'); 464 return (1); 465 } 466 if (!isascii(c)) { 467 c = toascii(c); 468 putchar('M'); 469 putchar('-'); 470 } 471 if (!isprint(c)) { 472 c ^= 0x40; /* DEL to ?, others to alpha */ 473 putchar('^'); 474 } 475 putchar(c); 476 } 477 putchar('"'); 478 return (0); 479 } 480 481 /* 482 * Convert an IP addr to a string. 483 * (like inet_ntoa, but ina is a pointer) 484 */ 485 char * 486 ipaddr_string(struct in_addr *ina) 487 { 488 static char b[24]; 489 u_char *p; 490 491 p = (u_char *) ina; 492 sprintf(b, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]); 493 return (b); 494 } 495 496 /* 497 * Local Variables: 498 * tab-width: 4 499 * c-indent-level: 4 500 * c-argdecl-indent: 4 501 * c-continued-statement-offset: 4 502 * c-continued-brace-offset: -4 503 * c-label-offset: -4 504 * c-brace-offset: 0 505 * End: 506 */ 507
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