bootptest.c revision 1.10
1 /* $NetBSD: bootptest.c,v 1.10 2002/09/18 23:13:40 mycroft 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 1.10 2002/09/18 23:13:40 mycroft 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 #include <sys/poll.h> 51 52 #include <net/if.h> 53 #include <netinet/in.h> 54 #include <arpa/inet.h> /* inet_ntoa */ 55 56 #include <stdlib.h> 57 #include <signal.h> 58 #include <stdio.h> 59 #include <string.h> 60 #include <errno.h> 61 #include <ctype.h> 62 #include <netdb.h> 63 #include <assert.h> 64 #include <unistd.h> 65 66 #include "bootp.h" 67 #include "bootptest.h" 68 #include "getif.h" 69 #include "report.h" 70 #include "patchlevel.h" 71 72 #define LOG_ERR 1 73 #define BUFLEN 1024 74 #define WAITSECS 1 75 #define MAXWAIT 10 76 77 int vflag = 1; 78 int tflag = 0; 79 int thiszone; 80 char *progname; 81 unsigned char *packetp; 82 unsigned char *snapend; 83 int snaplen; 84 85 86 /* 87 * IP port numbers for client and server obtained from /etc/services 88 */ 89 90 u_short bootps_port, bootpc_port; 91 92 93 /* 94 * Internet socket and interface config structures 95 */ 96 97 struct sockaddr_in sin_server; /* where to send requests */ 98 struct sockaddr_in sin_client; /* for bind and listen */ 99 struct sockaddr_in sin_from; /* Packet source */ 100 u_char eaddr[16]; /* Ethernet address */ 101 102 /* 103 * General 104 */ 105 106 int debug = 1; /* Debugging flag (level) */ 107 char hostname[MAXHOSTNAMELEN + 1]; 108 char *sndbuf; /* Send packet buffer */ 109 char *rcvbuf; /* Receive packet buffer */ 110 111 /* 112 * Vendor magic cookies for CMU and RFC1048 113 */ 114 115 unsigned char vm_cmu[4] = VM_CMU; 116 unsigned char vm_rfc1048[4] = VM_RFC1048; 117 short secs; /* How long client has waited */ 118 119 120 extern int getether(char *, char *); 121 int main(int, char **); 122 void send_request(int); 123 124 /* 125 * Initialization such as command-line processing is done, then 126 * the receiver loop is started. Die when interrupted. 127 */ 128 129 int 130 main(int argc, char **argv) 131 { 132 struct bootp *bp; 133 struct servent *sep; 134 struct hostent *hep; 135 136 char *servername = NULL; 137 char *vendor_file = NULL; 138 char *bp_file = NULL; 139 int s; /* Socket file descriptor */ 140 int n, fromlen, recvcnt; 141 int use_hwa = 0; 142 int32 vend_magic; 143 int32 xid; 144 145 progname = strrchr(argv[0], '/'); 146 if (progname) 147 progname++; 148 else 149 progname = argv[0]; 150 argc--; 151 argv++; 152 153 if (debug) 154 printf("%s: version %s.%d\n", progname, VERSION, PATCHLEVEL); 155 156 /* 157 * Verify that "struct bootp" has the correct official size. 158 * (Catch evil compilers that do struct padding.) 159 */ 160 assert(sizeof(struct bootp) == BP_MINPKTSZ); 161 162 sndbuf = malloc(BUFLEN); 163 rcvbuf = malloc(BUFLEN); 164 if (!sndbuf || !rcvbuf) { 165 printf("malloc failed\n"); 166 exit(1); 167 } 168 169 /* default magic number */ 170 bcopy(vm_rfc1048, (char*)&vend_magic, 4); 171 172 /* Handle option switches. */ 173 while (argc > 0) { 174 if (argv[0][0] != '-') 175 break; 176 switch (argv[0][1]) { 177 178 case 'f': /* File name to reqest. */ 179 if (argc < 2) 180 goto error; 181 argc--; argv++; 182 bp_file = *argv; 183 break; 184 185 case 'h': /* Use hardware address. */ 186 use_hwa = 1; 187 break; 188 189 case 'm': /* Magic number value. */ 190 if (argc < 2) 191 goto error; 192 argc--; argv++; 193 vend_magic = inet_addr(*argv); 194 break; 195 196 error: 197 default: 198 puts(usage); 199 exit(1); 200 201 } 202 argc--; 203 argv++; 204 } 205 206 /* Get server name (or address) for query. */ 207 if (argc > 0) { 208 servername = *argv; 209 argc--; 210 argv++; 211 } 212 /* Get optional vendor-data-template-file. */ 213 if (argc > 0) { 214 vendor_file = *argv; 215 argc--; 216 argv++; 217 } 218 if (!servername) { 219 printf("missing server name.\n"); 220 puts(usage); 221 exit(1); 222 } 223 /* 224 * Create a socket. 225 */ 226 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 227 perror("socket"); 228 exit(1); 229 } 230 /* 231 * Get server's listening port number 232 */ 233 sep = getservbyname("bootps", "udp"); 234 if (sep) { 235 bootps_port = ntohs((u_short) sep->s_port); 236 } else { 237 fprintf(stderr, "udp/bootps: unknown service -- using port %d\n", 238 IPPORT_BOOTPS); 239 bootps_port = (u_short) IPPORT_BOOTPS; 240 } 241 242 /* 243 * Set up server socket address (for send) 244 */ 245 if (servername) { 246 if (inet_aton(servername, &sin_server.sin_addr) == 0) { 247 hep = gethostbyname(servername); 248 if (!hep) { 249 fprintf(stderr, "%s: unknown host\n", servername); 250 exit(1); 251 } 252 memcpy(&sin_server.sin_addr, hep->h_addr, 253 sizeof(sin_server.sin_addr)); 254 } 255 } else { 256 /* Get broadcast address */ 257 /* XXX - not yet */ 258 sin_server.sin_addr.s_addr = INADDR_ANY; 259 } 260 sin_server.sin_family = AF_INET; 261 sin_server.sin_port = htons(bootps_port); 262 263 /* 264 * Get client's listening port number 265 */ 266 sep = getservbyname("bootpc", "udp"); 267 if (sep) { 268 bootpc_port = ntohs(sep->s_port); 269 } else { 270 fprintf(stderr, "udp/bootpc: unknown service -- using port %d\n", 271 IPPORT_BOOTPC); 272 bootpc_port = (u_short) IPPORT_BOOTPC; 273 } 274 275 /* 276 * Set up client socket address (for listen) 277 */ 278 sin_client.sin_family = AF_INET; 279 sin_client.sin_port = htons(bootpc_port); 280 sin_client.sin_addr.s_addr = INADDR_ANY; 281 282 /* 283 * Bind client socket to BOOTPC port. 284 */ 285 if (bind(s, (struct sockaddr *) &sin_client, sizeof(sin_client)) < 0) { 286 perror("bind BOOTPC port"); 287 if (errno == EACCES) 288 fprintf(stderr, "You need to run this as root\n"); 289 exit(1); 290 } 291 /* 292 * Build a request. 293 */ 294 bp = (struct bootp *) sndbuf; 295 bzero(bp, sizeof(*bp)); 296 bp->bp_op = BOOTREQUEST; 297 xid = (int32) getpid(); 298 bp->bp_xid = (u_int32) htonl(xid); 299 if (bp_file) 300 strncpy(bp->bp_file, bp_file, BP_FILE_LEN); 301 302 /* 303 * Fill in the hardware address (or client IP address) 304 */ 305 if (use_hwa) { 306 struct ifreq *ifr; 307 308 ifr = getif(s, &sin_server.sin_addr); 309 if (!ifr) { 310 printf("No interface for %s\n", servername); 311 exit(1); 312 } 313 if (getether(ifr->ifr_name, eaddr)) { 314 printf("Can not get ether addr for %s\n", ifr->ifr_name); 315 exit(1); 316 } 317 /* Copy Ethernet address into request packet. */ 318 bp->bp_htype = 1; 319 bp->bp_hlen = 6; 320 bcopy(eaddr, bp->bp_chaddr, bp->bp_hlen); 321 } else { 322 /* Fill in the client IP address. */ 323 gethostname(hostname, sizeof(hostname)); 324 hostname[sizeof(hostname) - 1] = '\0'; 325 hep = gethostbyname(hostname); 326 if (!hep) { 327 printf("Can not get my IP address\n"); 328 exit(1); 329 } 330 bcopy(hep->h_addr, &bp->bp_ciaddr, hep->h_length); 331 } 332 333 /* 334 * Copy in the default vendor data. 335 */ 336 bcopy((char*)&vend_magic, bp->bp_vend, 4); 337 if (vend_magic) 338 bp->bp_vend[4] = TAG_END; 339 340 /* 341 * Read in the "options" part of the request. 342 * This also determines the size of the packet. 343 */ 344 snaplen = sizeof(*bp); 345 if (vendor_file) { 346 int fd = open(vendor_file, 0); 347 if (fd < 0) { 348 perror(vendor_file); 349 exit(1); 350 } 351 /* Compute actual space for options. */ 352 n = BUFLEN - sizeof(*bp) + BP_VEND_LEN; 353 n = read(fd, bp->bp_vend, n); 354 close(fd); 355 if (n < 0) { 356 perror(vendor_file); 357 exit(1); 358 } 359 printf("read %d bytes of vendor template\n", n); 360 if (n > BP_VEND_LEN) { 361 printf("warning: extended options in use (len > %d)\n", 362 BP_VEND_LEN); 363 snaplen += (n - BP_VEND_LEN); 364 } 365 } 366 /* 367 * Set globals needed by print_bootp 368 * (called by send_request) 369 */ 370 packetp = (unsigned char *) eaddr; 371 snapend = (unsigned char *) sndbuf + snaplen; 372 373 /* Send a request once per second while waiting for replies. */ 374 recvcnt = 0; 375 bp->bp_secs = secs = 0; 376 send_request(s); 377 while (1) { 378 struct pollfd set[1]; 379 380 set[0].fd = s; 381 set[0].events = POLLIN; 382 n = poll(set, 1, WAITSECS * 1000); 383 if (n < 0) { 384 perror("poll"); 385 break; 386 } 387 if (n == 0) { 388 /* 389 * We have not received a response in the last second. 390 * If we have ever received any responses, exit now. 391 * Otherwise, bump the "wait time" field and re-send. 392 */ 393 if (recvcnt > 0) 394 exit(0); 395 secs += WAITSECS; 396 if (secs > MAXWAIT) 397 break; 398 bp->bp_secs = htons(secs); 399 send_request(s); 400 continue; 401 } 402 fromlen = sizeof(sin_from); 403 n = recvfrom(s, rcvbuf, BUFLEN, 0, 404 (struct sockaddr *) &sin_from, &fromlen); 405 if (n <= 0) { 406 continue; 407 } 408 if (n < sizeof(struct bootp)) { 409 printf("received short packet\n"); 410 continue; 411 } 412 recvcnt++; 413 414 /* Print the received packet. */ 415 printf("Recvd from %s", inet_ntoa(sin_from.sin_addr)); 416 /* set globals needed by bootp_print() */ 417 snaplen = n; 418 snapend = (unsigned char *) rcvbuf + snaplen; 419 bootp_print((struct bootp *)rcvbuf, n, sin_from.sin_port, 0); 420 putchar('\n'); 421 /* 422 * This no longer exits immediately after receiving 423 * one response because it is useful to know if the 424 * client might get multiple responses. This code 425 * will now listen for one second after a response. 426 */ 427 } 428 fprintf(stderr, "no response from %s\n", servername); 429 exit(1); 430 } 431 432 void 433 send_request(int s) 434 { 435 /* Print the request packet. */ 436 printf("Sending to %s", inet_ntoa(sin_server.sin_addr)); 437 bootp_print((struct bootp *)sndbuf, snaplen, sin_from.sin_port, 0); 438 putchar('\n'); 439 440 /* Send the request packet. */ 441 if (sendto(s, sndbuf, snaplen, 0, 442 (struct sockaddr *) &sin_server, 443 sizeof(sin_server)) < 0) 444 { 445 perror("sendto server"); 446 exit(1); 447 } 448 } 449 450 /* 451 * Print out a filename (or other ascii string). 452 * Return true if truncated. 453 */ 454 int 455 printfn(u_char *s, u_char *ep) 456 { 457 u_char c; 458 459 putchar('"'); 460 while ((c = *s++) != 0) { 461 if (s > ep) { 462 putchar('"'); 463 return (1); 464 } 465 if (!isascii(c)) { 466 c = toascii(c); 467 putchar('M'); 468 putchar('-'); 469 } 470 if (!isprint(c)) { 471 c ^= 0x40; /* DEL to ?, others to alpha */ 472 putchar('^'); 473 } 474 putchar(c); 475 } 476 putchar('"'); 477 return (0); 478 } 479 480 /* 481 * Convert an IP addr to a string. 482 * (like inet_ntoa, but ina is a pointer) 483 */ 484 char * 485 ipaddr_string(struct in_addr *ina) 486 { 487 static char b[24]; 488 u_char *p; 489 490 p = (u_char *) ina; 491 sprintf(b, "%d.%d.%d.%d", p[0], p[1], p[2], p[3]); 492 return (b); 493 } 494 495 /* 496 * Local Variables: 497 * tab-width: 4 498 * c-indent-level: 4 499 * c-argdecl-indent: 4 500 * c-continued-statement-offset: 4 501 * c-continued-brace-offset: -4 502 * c-label-offset: -4 503 * c-brace-offset: 0 504 * End: 505 */ 506
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