bootptest.c revision 1.1
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 is 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. 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 (at) mc.com> 33 */ 34 35 char *usage = "bootptest [-h] server-name [vendor-data-template-file]"; 36 37 #include <sys/types.h> 38 #include <sys/socket.h> 39 #include <sys/ioctl.h> 40 #include <sys/file.h> 41 #include <sys/time.h> 42 #include <sys/stat.h> 43 44 #include <net/if.h> 45 #include <netinet/in.h> 46 #include <arpa/inet.h> /* inet_ntoa */ 47 48 #include <stdlib.h> 49 #include <signal.h> 50 #include <stdio.h> 51 #include <string.h> 52 #include <errno.h> 53 #include <ctype.h> 54 #include <netdb.h> 55 #include <assert.h> 56 57 #include "bootp.h" 58 #include "bootptest.h" 59 #include "getif.h" 60 #include "patchlevel.h" 61 62 #define LOG_ERR 1 63 #define BUFLEN 1024 64 #define WAITSECS 1 65 #define MAXWAIT 10 66 67 int vflag = 1; 68 int tflag = 0; 69 int thiszone; 70 char *progname; 71 unsigned char *packetp; 72 unsigned char *snapend; 73 int snaplen; 74 75 76 /* 77 * IP port numbers for client and server obtained from /etc/services 78 */ 79 80 u_short bootps_port, bootpc_port; 81 82 83 /* 84 * Internet socket and interface config structures 85 */ 86 87 struct sockaddr_in sin_server; /* where to send requests */ 88 struct sockaddr_in sin_client; /* for bind and listen */ 89 struct sockaddr_in sin_from; /* Packet source */ 90 u_char eaddr[16]; /* Ethernet address */ 91 92 /* 93 * General 94 */ 95 96 int debug = 1; /* Debugging flag (level) */ 97 char hostname[64]; 98 char *sndbuf; /* Send packet buffer */ 99 char *rcvbuf; /* Receive packet buffer */ 100 101 /* 102 * Vendor magic cookies for CMU and RFC1048 103 */ 104 105 unsigned char vm_cmu[4] = VM_CMU; 106 unsigned char vm_rfc1048[4] = VM_RFC1048; 107 short secs; /* How long client has waited */ 108 109 char *get_errmsg(); 110 extern void bootp_print(); 111 112 /* 113 * Initialization such as command-line processing is done, then 114 * the receiver loop is started. Die when interrupted. 115 */ 116 117 main(argc, argv) 118 int argc; 119 char **argv; 120 { 121 struct bootp *bp; 122 struct servent *sep; 123 struct hostent *hep; 124 125 char *servername = NULL; 126 char *vendor_file = NULL; 127 char *bp_file = NULL; 128 int32 server_addr; /* inet addr, network order */ 129 int s; /* Socket file descriptor */ 130 int n, tolen, fromlen, recvcnt; 131 int use_hwa = 0; 132 int32 xid; 133 134 progname = strrchr(argv[0], '/'); 135 if (progname) 136 progname++; 137 else 138 progname = argv[0]; 139 argc--; 140 argv++; 141 142 if (debug) 143 printf("%s: version %s.%d\n", progname, VERSION, PATCHLEVEL); 144 145 /* Debugging for compilers with struct padding. */ 146 assert(sizeof(struct bootp) == BP_MINPKTSZ); 147 148 sndbuf = malloc(BUFLEN); 149 rcvbuf = malloc(BUFLEN); 150 if (!sndbuf || !rcvbuf) { 151 printf("malloc failed\n"); 152 exit(1); 153 } 154 /* Handle option switches. */ 155 while (argc > 0) { 156 if (argv[0][0] != '-') 157 break; 158 switch (argv[0][1]) { 159 160 case 'f': /* File name to reqest. */ 161 if (argc < 2) 162 goto error; 163 argc--; argv++; 164 bp_file = *argv; 165 break; 166 167 case 'h': /* Use hardware address. */ 168 use_hwa = 1; 169 break; 170 171 error: 172 default: 173 puts(usage); 174 exit(1); 175 176 } 177 argc--; 178 argv++; 179 } 180 181 /* Get server name (or address) for query. */ 182 if (argc > 0) { 183 servername = *argv; 184 argc--; 185 argv++; 186 } 187 /* Get optional vendor-data-template-file. */ 188 if (argc > 0) { 189 vendor_file = *argv; 190 argc--; 191 argv++; 192 } 193 if (!servername) { 194 printf("missing server name.\n"); 195 puts(usage); 196 exit(1); 197 } 198 /* 199 * Create a socket. 200 */ 201 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 202 perror("socket"); 203 exit(1); 204 } 205 /* 206 * Get server's listening port number 207 */ 208 sep = getservbyname("bootps", "udp"); 209 if (sep) { 210 bootps_port = ntohs((u_short) sep->s_port); 211 } else { 212 fprintf(stderr, "udp/bootps: unknown service -- using port %d\n", 213 IPPORT_BOOTPS); 214 bootps_port = (u_short) IPPORT_BOOTPS; 215 } 216 217 /* 218 * Set up server socket address (for send) 219 */ 220 if (servername) { 221 if (isdigit(servername[0])) 222 server_addr = inet_addr(servername); 223 else { 224 hep = gethostbyname(servername); 225 if (!hep) { 226 fprintf(stderr, "%s: unknown host\n", servername); 227 exit(1); 228 } 229 bcopy(hep->h_addr, &server_addr, sizeof(server_addr)); 230 } 231 } else { 232 /* Get broadcast address */ 233 /* XXX - not yet */ 234 server_addr = INADDR_ANY; 235 } 236 sin_server.sin_family = AF_INET; 237 sin_server.sin_port = htons(bootps_port); 238 sin_server.sin_addr.s_addr = server_addr; 239 240 /* 241 * Get client's listening port number 242 */ 243 sep = getservbyname("bootpc", "udp"); 244 if (sep) { 245 bootpc_port = ntohs(sep->s_port); 246 } else { 247 fprintf(stderr, "udp/bootpc: unknown service -- using port %d\n", 248 IPPORT_BOOTPC); 249 bootpc_port = (u_short) IPPORT_BOOTPC; 250 } 251 252 /* 253 * Set up client socket address (for listen) 254 */ 255 sin_client.sin_family = AF_INET; 256 sin_client.sin_port = htons(bootpc_port); 257 sin_client.sin_addr.s_addr = INADDR_ANY; 258 259 /* 260 * Bind client socket to BOOTPC port. 261 */ 262 if (bind(s, (struct sockaddr *) &sin_client, sizeof(sin_client)) < 0) { 263 perror("bind BOOTPC port"); 264 if (errno == EACCES) 265 fprintf(stderr, "You need to run this as root\n"); 266 exit(1); 267 } 268 /* 269 * Build a request. 270 */ 271 bp = (struct bootp *) sndbuf; 272 bzero(bp, sizeof(*bp)); 273 bp->bp_op = BOOTREQUEST; 274 xid = (int32) getpid(); 275 bp->bp_xid = (u_int32) htonl(xid); 276 if (bp_file) 277 strncpy(bp->bp_file, bp_file, BP_FILE_LEN); 278 279 /* 280 * Fill in the hardware address (or client IP address) 281 */ 282 if (use_hwa) { 283 struct ifreq *ifr; 284 285 ifr = getif(s, &sin_server.sin_addr); 286 if (!ifr) { 287 printf("No interface for %s\n", servername); 288 exit(1); 289 } 290 if (getether(ifr->ifr_name, eaddr)) { 291 printf("Can not get ether addr for %s\n", ifr->ifr_name); 292 exit(1); 293 } 294 /* Copy Ethernet address into request packet. */ 295 bp->bp_htype = 1; 296 bp->bp_hlen = 6; 297 bcopy(eaddr, bp->bp_chaddr, bp->bp_hlen); 298 } else { 299 /* Fill in the client IP address. */ 300 gethostname(hostname, sizeof(hostname)); 301 hep = gethostbyname(hostname); 302 if (!hep) { 303 printf("Can not get my IP address\n"); 304 exit(1); 305 } 306 bcopy(hep->h_addr, &bp->bp_ciaddr, hep->h_length); 307 } 308 309 /* 310 * Copy in the default vendor data. 311 */ 312 bcopy(vm_rfc1048, bp->bp_vend, sizeof(vm_rfc1048)); 313 bp->bp_vend[4] = TAG_END; 314 315 /* 316 * Read in the "options" part of the request. 317 * This also determines the size of the packet. 318 */ 319 snaplen = sizeof(*bp); 320 if (vendor_file) { 321 int fd = open(vendor_file, 0); 322 if (fd < 0) { 323 perror(vendor_file); 324 exit(1); 325 } 326 /* Compute actual space for options. */ 327 n = BUFLEN - sizeof(*bp) + BP_VEND_LEN; 328 n = read(fd, bp->bp_vend, n); 329 close(fd); 330 if (n < 0) { 331 perror(vendor_file); 332 exit(1); 333 } 334 printf("read %d bytes of vendor template\n", n); 335 if (n > BP_VEND_LEN) { 336 printf("warning: extended options in use (len > %d)\n", 337 BP_VEND_LEN); 338 snaplen += (n - BP_VEND_LEN); 339 } 340 } 341 /* 342 * Set globals needed by print_bootp 343 * (called by send_request) 344 */ 345 packetp = (unsigned char *) eaddr; 346 snapend = (unsigned char *) sndbuf + snaplen; 347 348 /* Send a request once per second while waiting for replies. */ 349 recvcnt = 0; 350 bp->bp_secs = secs = 0; 351 send_request(s); 352 while (1) { 353 struct timeval tv; 354 int readfds; 355 356 tv.tv_sec = WAITSECS; 357 tv.tv_usec = 0L; 358 readfds = (1 << s); 359 n = select(s + 1, (fd_set *) & readfds, NULL, NULL, &tv); 360 if (n < 0) { 361 perror("select"); 362 break; 363 } 364 if (n == 0) { 365 /* 366 * We have not received a response since the last send. 367 * If we have ever received any responses, exit now. 368 * Otherwise, bump the "wait time" field and re-send. 369 */ 370 if (recvcnt > 0) 371 exit(0); 372 secs += WAITSECS; 373 if (secs > MAXWAIT) 374 break; 375 bp->bp_secs = htons(secs); 376 send_request(s); 377 continue; 378 } 379 fromlen = sizeof(sin_from); 380 n = recvfrom(s, rcvbuf, BUFLEN, 0, 381 (struct sockaddr *) &sin_from, &fromlen); 382 if (n <= 0) { 383 continue; 384 } 385 if (n < sizeof(struct bootp)) { 386 printf("received short packet\n"); 387 continue; 388 } 389 recvcnt++; 390 391 /* Print the received packet. */ 392 printf("Recvd from %s", inet_ntoa(sin_from.sin_addr)); 393 /* set globals needed by bootp_print() */ 394 snaplen = n; 395 snapend = (unsigned char *) rcvbuf + snaplen; 396 bootp_print(rcvbuf, n, sin_from.sin_port, 0); 397 putchar('\n'); 398 /* 399 * This no longer exits immediately after receiving 400 * one response because it is useful to know if the 401 * client might get multiple responses. This code 402 * will now listen for one second after a response. 403 */ 404 } 405 fprintf(stderr, "no response from %s\n", servername); 406 exit(1); 407 } 408 409 send_request(s) 410 int s; 411 { 412 /* Print the request packet. */ 413 printf("Sending to %s", inet_ntoa(sin_server.sin_addr)); 414 bootp_print(sndbuf, snaplen, sin_from.sin_port, 0); 415 putchar('\n'); 416 417 /* Send the request packet. */ 418 if (sendto(s, sndbuf, snaplen, 0, 419 (struct sockaddr *) &sin_server, 420 sizeof(sin_server)) < 0) 421 { 422 perror("sendto server"); 423 exit(1); 424 } 425 } 426 427 /* 428 * Print out a filename (or other ascii string). 429 * Return true if truncated. 430 */ 431 int 432 printfn(s, ep) 433 register u_char *s, *ep; 434 { 435 register u_char c; 436 437 putchar('"'); 438 while (c = *s++) { 439 if (s > ep) { 440 putchar('"'); 441 return (1); 442 } 443 if (!isascii(c)) { 444 c = toascii(c); 445 putchar('M'); 446 putchar('-'); 447 } 448 if (!isprint(c)) { 449 c ^= 0x40; /* DEL to ?, others to alpha */ 450 putchar('^'); 451 } 452 putchar(c); 453 } 454 putchar('"'); 455 return (0); 456 } 457 458 /* 459 * Convert an IP addr to a string. 460 * (like inet_ntoa, but ina is a pointer) 461 */ 462 char * 463 ipaddr_string(ina) 464 struct in_addr *ina; 465 { 466 static char b[24]; 467 u_char *p; 468 469 p = (u_char *) ina; 470 sprintf(b, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]); 471 return (b); 472 } 473 474 /* 475 * Local Variables: 476 * tab-width: 4 477 * c-indent-level: 4 478 * c-argdecl-indent: 4 479 * c-continued-statement-offset: 4 480 * c-continued-brace-offset: -4 481 * c-label-offset: -4 482 * c-brace-offset: 0 483 * End: 484 */ 485
Indexes created Wed Sep 24 14:09:57 GMT 2025