1 /* $NetBSD: bootptest.c,v 1.22 2022/12/24 15:23:03 andvar 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 1.22 2022/12/24 15:23:03 andvar 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 void send_request(int); 125 126 /* 127 * Initialization such as command-line processing is done, then 128 * the receiver loop is started. Die when interrupted. 129 */ 130 131 int 132 main(int argc, char **argv) 133 { 134 struct bootp *bp; 135 struct servent *sep; 136 struct hostent *hep; 137 138 char *servername = NULL; 139 char *vendor_file = NULL; 140 char *bp_file = NULL; 141 socklen_t fromlen; 142 int s; /* Socket file descriptor */ 143 int n, recvcnt; 144 int use_hwa = 0; 145 int32 vend_magic; 146 int32 xid; 147 struct pollfd set[1]; 148 149 progname = strrchr(argv[0], '/'); 150 if (progname) 151 progname++; 152 else 153 progname = argv[0]; 154 argc--; 155 argv++; 156 157 if (debug) 158 printf("%s: version %s.%d\n", progname, VERSION, PATCHLEVEL); 159 160 /* 161 * Verify that "struct bootp" has the correct official size. 162 * (Catch evil compilers that do struct padding.) 163 */ 164 assert(sizeof(struct bootp) == BP_MINPKTSZ); 165 166 sndbuf = malloc(BUFLEN); 167 rcvbuf = malloc(BUFLEN); 168 if (!sndbuf || !rcvbuf) { 169 printf("malloc failed\n"); 170 exit(1); 171 } 172 173 /* default magic number */ 174 bcopy(vm_rfc1048, (char*)&vend_magic, 4); 175 176 /* Handle option switches. */ 177 while (argc > 0) { 178 if (argv[0][0] != '-') 179 break; 180 switch (argv[0][1]) { 181 182 case 'f': /* File name to request. */ 183 if (argc < 2) 184 goto error; 185 argc--; argv++; 186 bp_file = *argv; 187 break; 188 189 case 'h': /* Use hardware address. */ 190 use_hwa = 1; 191 break; 192 193 case 'm': /* Magic number value. */ 194 if (argc < 2) 195 goto error; 196 argc--; argv++; 197 vend_magic = inet_addr(*argv); 198 break; 199 200 error: 201 default: 202 (void)fprintf(stderr, usage, getprogname()); 203 exit(1); 204 205 } 206 argc--; 207 argv++; 208 } 209 210 /* Get server name (or address) for query. */ 211 if (argc > 0) { 212 servername = *argv; 213 argc--; 214 argv++; 215 } 216 /* Get optional vendor-data-template-file. */ 217 if (argc > 0) { 218 vendor_file = *argv; 219 argc--; 220 argv++; 221 } 222 if (!servername) { 223 printf("missing server name.\n"); 224 (void)fprintf(stderr, usage, getprogname()); 225 exit(1); 226 } 227 /* 228 * Create a socket. 229 */ 230 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { 231 perror("socket"); 232 exit(1); 233 } 234 /* 235 * Get server's listening port number 236 */ 237 sep = getservbyname("bootps", "udp"); 238 if (sep) { 239 bootps_port = ntohs((u_short) sep->s_port); 240 } else { 241 fprintf(stderr, "udp/bootps: unknown service -- using port %d\n", 242 IPPORT_BOOTPS); 243 bootps_port = (u_short) IPPORT_BOOTPS; 244 } 245 246 /* 247 * Set up server socket address (for send) 248 */ 249 if (servername) { 250 if (inet_aton(servername, &sin_server.sin_addr) == 0) { 251 hep = gethostbyname(servername); 252 if (!hep) { 253 fprintf(stderr, "%s: unknown host\n", servername); 254 exit(1); 255 } 256 memcpy(&sin_server.sin_addr, hep->h_addr, 257 sizeof(sin_server.sin_addr)); 258 } 259 } else { 260 /* Get broadcast address */ 261 /* XXX - not yet */ 262 sin_server.sin_addr.s_addr = INADDR_ANY; 263 } 264 sin_server.sin_family = AF_INET; 265 sin_server.sin_port = htons(bootps_port); 266 267 /* 268 * Get client's listening port number 269 */ 270 sep = getservbyname("bootpc", "udp"); 271 if (sep) { 272 bootpc_port = ntohs(sep->s_port); 273 } else { 274 fprintf(stderr, "udp/bootpc: unknown service -- using port %d\n", 275 IPPORT_BOOTPC); 276 bootpc_port = (u_short) IPPORT_BOOTPC; 277 } 278 279 /* 280 * Set up client socket address (for listen) 281 */ 282 sin_client.sin_family = AF_INET; 283 sin_client.sin_port = htons(bootpc_port); 284 sin_client.sin_addr.s_addr = INADDR_ANY; 285 286 /* 287 * Bind client socket to BOOTPC port. 288 */ 289 if (bind(s, (struct sockaddr *) &sin_client, sizeof(sin_client)) < 0) { 290 perror("bind BOOTPC port"); 291 if (errno == EACCES) 292 fprintf(stderr, "You need to run this as root\n"); 293 exit(1); 294 } 295 /* 296 * Build a request. 297 */ 298 bp = (struct bootp *) sndbuf; 299 bzero(bp, sizeof(*bp)); 300 bp->bp_op = BOOTREQUEST; 301 xid = (int32) getpid(); 302 bp->bp_xid = (u_int32) htonl(xid); 303 if (bp_file) 304 strlcpy(bp->bp_file, bp_file, sizeof(bp->bp_file)); 305 306 /* 307 * Fill in the hardware address (or client IP address) 308 */ 309 if (use_hwa) { 310 struct ifreq *ifr; 311 312 ifr = getif(s, &sin_server.sin_addr); 313 if (!ifr) { 314 printf("No interface for %s\n", servername); 315 exit(1); 316 } 317 if (getether(ifr->ifr_name, (char *)eaddr)) { 318 printf("Can not get ether addr for %s\n", ifr->ifr_name); 319 exit(1); 320 } 321 /* Copy Ethernet address into request packet. */ 322 bp->bp_htype = 1; 323 bp->bp_hlen = 6; 324 bcopy(eaddr, bp->bp_chaddr, bp->bp_hlen); 325 } else { 326 /* Fill in the client IP address. */ 327 gethostname(hostname, sizeof(hostname)); 328 hostname[sizeof(hostname) - 1] = '\0'; 329 hep = gethostbyname(hostname); 330 if (!hep) { 331 printf("Can not get my IP address\n"); 332 exit(1); 333 } 334 bcopy(hep->h_addr, &bp->bp_ciaddr, hep->h_length); 335 } 336 337 /* 338 * Copy in the default vendor data. 339 */ 340 bcopy((char*)&vend_magic, bp->bp_vend, 4); 341 if (vend_magic) 342 bp->bp_vend[4] = TAG_END; 343 344 /* 345 * Read in the "options" part of the request. 346 * This also determines the size of the packet. 347 */ 348 snaplen = sizeof(*bp); 349 if (vendor_file) { 350 int fd = open(vendor_file, 0); 351 if (fd < 0) { 352 perror(vendor_file); 353 exit(1); 354 } 355 /* Compute actual space for options. */ 356 n = BUFLEN - sizeof(*bp) + BP_VEND_LEN; 357 n = read(fd, bp->bp_vend, n); 358 close(fd); 359 if (n < 0) { 360 perror(vendor_file); 361 exit(1); 362 } 363 printf("read %d bytes of vendor template\n", n); 364 if (n > BP_VEND_LEN) { 365 printf("warning: extended options in use (len > %d)\n", 366 BP_VEND_LEN); 367 snaplen += (n - BP_VEND_LEN); 368 } 369 } 370 /* 371 * Set globals needed by print_bootp 372 * (called by send_request) 373 */ 374 packetp = (unsigned char *) eaddr; 375 snapend = (unsigned char *) sndbuf + snaplen; 376 377 /* Send a request once per second while waiting for replies. */ 378 recvcnt = 0; 379 bp->bp_secs = secs = 0; 380 send_request(s); 381 set[0].fd = s; 382 set[0].events = POLLIN; 383 while (1) { 384 n = poll(set, 1, WAITSECS * 1000); 385 if (n < 0) { 386 perror("poll"); 387 break; 388 } 389 if (n == 0) { 390 /* 391 * We have not received a response in the last second. 392 * If we have ever received any responses, exit now. 393 * Otherwise, bump the "wait time" field and re-send. 394 */ 395 if (recvcnt > 0) 396 exit(0); 397 secs += WAITSECS; 398 if (secs > MAXWAIT) 399 break; 400 bp->bp_secs = htons(secs); 401 send_request(s); 402 continue; 403 } 404 fromlen = sizeof(sin_from); 405 n = recvfrom(s, rcvbuf, BUFLEN, 0, 406 (struct sockaddr *) &sin_from, &fromlen); 407 if (n <= 0) { 408 continue; 409 } 410 if (n < (int)sizeof(struct bootp)) { 411 printf("received short packet\n"); 412 continue; 413 } 414 recvcnt++; 415 416 /* Print the received packet. */ 417 printf("Recvd from %s", inet_ntoa(sin_from.sin_addr)); 418 /* set globals needed by bootp_print() */ 419 snaplen = n; 420 snapend = (unsigned char *) rcvbuf + snaplen; 421 bootp_print((struct bootp *)rcvbuf, n, sin_from.sin_port, 0); 422 putchar('\n'); 423 /* 424 * This no longer exits immediately after receiving 425 * one response because it is useful to know if the 426 * client might get multiple responses. This code 427 * will now listen for one second after a response. 428 */ 429 } 430 fprintf(stderr, "no response from %s\n", servername); 431 exit(1); 432 } 433 434 void 435 send_request(int s) 436 { 437 /* Print the request packet. */ 438 printf("Sending to %s", inet_ntoa(sin_server.sin_addr)); 439 bootp_print((struct bootp *)sndbuf, snaplen, sin_from.sin_port, 0); 440 putchar('\n'); 441 442 /* Send the request packet. */ 443 if (sendto(s, sndbuf, snaplen, 0, 444 (struct sockaddr *) &sin_server, 445 sizeof(sin_server)) < 0) 446 { 447 perror("sendto server"); 448 exit(1); 449 } 450 } 451 452 /* 453 * Print out a filename (or other ascii string). 454 * Return true if truncated. 455 */ 456 int 457 printfn(u_char *s, u_char *ep) 458 { 459 u_char c; 460 461 putchar('"'); 462 while ((c = *s++) != 0) { 463 if (s > ep) { 464 putchar('"'); 465 return (1); 466 } 467 if (!isascii(c)) { 468 c = toascii(c); 469 putchar('M'); 470 putchar('-'); 471 } 472 if (!isprint(c)) { 473 c ^= 0x40; /* DEL to ?, others to alpha */ 474 putchar('^'); 475 } 476 putchar(c); 477 } 478 putchar('"'); 479 return (0); 480 } 481 482 /* 483 * Convert an IP addr to a string. 484 * (like inet_ntoa, but ina is a pointer) 485 */ 486 char * 487 ipaddr_string(struct in_addr *ina) 488 { 489 static char b[24]; 490 u_char *p; 491 492 p = (u_char *) ina; 493 snprintf(b, sizeof(b), "%d.%d.%d.%d", p[0], p[1], p[2], p[3]); 494 return (b); 495 } 496 497 /* 498 * Local Variables: 499 * tab-width: 4 500 * c-indent-level: 4 501 * c-argdecl-indent: 4 502 * c-continued-statement-offset: 4 503 * c-continued-brace-offset: -4 504 * c-label-offset: -4 505 * c-brace-offset: 0 506 * End: 507 */ 508
Indexes created Mon Sep 22 05:09:51 GMT 2025