bootparamd.c revision 1.23.2.1
1 /* $NetBSD: bootparamd.c,v 1.23.2.1 2000/06/22 18:01:09 minoura Exp $ */ 2 3 /* 4 * This code is not copyright, and is placed in the public domain. 5 * Feel free to use and modify. Please send modifications and/or 6 * suggestions + bug fixes to Klas Heggemann <klas (at) nada.kth.se> 7 * 8 * Various small changes by Theo de Raadt <deraadt (at) fsa.ca> 9 * Parser rewritten (adding YP support) by Roland McGrath <roland (at) frob.com> 10 */ 11 12 #include <sys/cdefs.h> 13 #ifndef lint 14 __RCSID("$NetBSD: bootparamd.c,v 1.23.2.1 2000/06/22 18:01:09 minoura Exp $"); 15 #endif 16 17 #include <sys/types.h> 18 #include <sys/ioctl.h> 19 #include <sys/stat.h> 20 #include <sys/socket.h> 21 22 #include <ctype.h> 23 #include <errno.h> 24 #include <err.h> 25 #include <netdb.h> 26 #include <stdlib.h> 27 #include <stdio.h> 28 #include <string.h> 29 #include <syslog.h> 30 #include <unistd.h> 31 #include <util.h> 32 #include <ifaddrs.h> 33 34 #include <net/if.h> 35 36 #include <netinet/in.h> 37 #include <arpa/inet.h> 38 39 #include <rpc/rpc.h> 40 #include <rpc/pmap_clnt.h> 41 #include <rpcsvc/bootparam_prot.h> 42 #include <rpcsvc/ypclnt.h> 43 44 #include "pathnames.h" 45 46 #define MAXLEN 800 47 48 static char hostname[MAX_MACHINE_NAME]; 49 static char askname[MAX_MACHINE_NAME]; 50 static char domain_name[MAX_MACHINE_NAME]; 51 52 extern void bootparamprog_1 __P((struct svc_req *, SVCXPRT *)); 53 54 int _rpcsvcdirty = 0; 55 int _rpcpmstart = 0; 56 int debug = 0; 57 int dolog = 0; 58 struct in_addr route_addr; 59 struct sockaddr_in my_addr; 60 extern char *__progname; 61 char *bootpfile = _PATH_BOOTPARAMS; 62 63 int main __P((int, char *[])); 64 int lookup_bootparam __P((char *, char *, char *, char **, char **)); 65 void usage __P((void)); 66 static int get_localaddr __P((const char *, struct sockaddr_in *)); 67 68 69 /* 70 * ever familiar 71 */ 72 int 73 main(argc, argv) 74 int argc; 75 char *argv[]; 76 { 77 SVCXPRT *transp; 78 struct hostent *he; 79 struct stat buf; 80 int c; 81 82 while ((c = getopt(argc, argv, "dsr:f:")) != -1) 83 switch (c) { 84 case 'd': 85 debug = 1; 86 break; 87 case 'r': 88 if (isdigit(*optarg)) { 89 if (inet_aton(optarg, &route_addr) != 0) 90 break; 91 } 92 he = gethostbyname(optarg); 93 if (he == 0) { 94 warnx("no such host: %s", optarg); 95 usage(); 96 } 97 memmove(&route_addr.s_addr, he->h_addr, he->h_length); 98 break; 99 case 'f': 100 bootpfile = optarg; 101 break; 102 case 's': 103 dolog = 1; 104 #ifndef LOG_DAEMON 105 openlog(__progname, 0, 0); 106 #else 107 openlog(__progname, 0, LOG_DAEMON); 108 setlogmask(LOG_UPTO(LOG_NOTICE)); 109 #endif 110 break; 111 default: 112 usage(); 113 } 114 115 if (stat(bootpfile, &buf)) 116 err(1, "%s", bootpfile); 117 118 if (route_addr.s_addr == 0) { 119 if (get_localaddr(NULL, &my_addr) != 0) 120 errx(1, "router address not found"); 121 route_addr.s_addr = my_addr.sin_addr.s_addr; 122 } 123 if (!debug) { 124 if (daemon(0, 0)) 125 err(1, "can't detach from terminal"); 126 } 127 pidfile(NULL); 128 129 (void) pmap_unset(BOOTPARAMPROG, BOOTPARAMVERS); 130 131 transp = svcudp_create(RPC_ANYSOCK); 132 if (transp == NULL) 133 errx(1, "can't create udp service"); 134 135 if (!svc_register(transp, BOOTPARAMPROG, BOOTPARAMVERS, bootparamprog_1, 136 IPPROTO_UDP)) 137 /* 138 * Do NOT change the "%u" in the format string below to "%lu". If your 139 * build fails update the "rpcgen" program and use "make cleandir" and 140 * "make includes" in "src/lib/librpcsvc" afterwards. 141 */ 142 errx(1, "unable to register BOOTPARAMPROG version %u, udp", 143 BOOTPARAMVERS); 144 145 svc_run(); 146 errx(1, "svc_run returned"); 147 } 148 149 bp_whoami_res * 150 bootparamproc_whoami_1_svc(whoami, rqstp) 151 bp_whoami_arg *whoami; 152 struct svc_req *rqstp; 153 { 154 static bp_whoami_res res; 155 struct hostent *he; 156 struct in_addr haddr; 157 int e; 158 159 if (debug) 160 warnx("whoami got question for %d.%d.%d.%d", 161 255 & whoami->client_address.bp_address_u.ip_addr.net, 162 255 & whoami->client_address.bp_address_u.ip_addr.host, 163 255 & whoami->client_address.bp_address_u.ip_addr.lh, 164 255 & whoami->client_address.bp_address_u.ip_addr.impno); 165 if (dolog) 166 syslog(LOG_NOTICE, "whoami got question for %d.%d.%d.%d", 167 255 & whoami->client_address.bp_address_u.ip_addr.net, 168 255 & whoami->client_address.bp_address_u.ip_addr.host, 169 255 & whoami->client_address.bp_address_u.ip_addr.lh, 170 255 & whoami->client_address.bp_address_u.ip_addr.impno); 171 172 memmove((char *) &haddr, 173 (char *) &whoami->client_address.bp_address_u.ip_addr, 174 sizeof(haddr)); 175 he = gethostbyaddr((char *) &haddr, sizeof(haddr), AF_INET); 176 if (he) { 177 strncpy(askname, he->h_name, sizeof(askname)); 178 askname[sizeof(askname)-1] = 0; 179 } else { 180 strncpy(askname, inet_ntoa(haddr), sizeof(askname)); 181 askname[sizeof(askname)-1] = 0; 182 } 183 184 if (debug) 185 warnx("This is host %s", askname); 186 if (dolog) 187 syslog(LOG_NOTICE, "This is host %s", askname); 188 189 if ((e = lookup_bootparam(askname, hostname, NULL, NULL, NULL)) == 0) { 190 res.client_name = hostname; 191 getdomainname(domain_name, MAX_MACHINE_NAME); 192 res.domain_name = domain_name; 193 194 if (res.router_address.address_type != IP_ADDR_TYPE) { 195 res.router_address.address_type = IP_ADDR_TYPE; 196 memmove(&res.router_address.bp_address_u.ip_addr, 197 &route_addr.s_addr,4); 198 } 199 if (debug) 200 warnx("Returning %s %s %d.%d.%d.%d", 201 res.client_name, res.domain_name, 202 255 & res.router_address.bp_address_u.ip_addr.net, 203 255 & res.router_address.bp_address_u.ip_addr.host, 204 255 & res.router_address.bp_address_u.ip_addr.lh, 205 255 &res.router_address.bp_address_u.ip_addr.impno); 206 if (dolog) 207 syslog(LOG_NOTICE, "Returning %s %s %d.%d.%d.%d", 208 res.client_name, res.domain_name, 209 255 & res.router_address.bp_address_u.ip_addr.net, 210 255 & res.router_address.bp_address_u.ip_addr.host, 211 255 & res.router_address.bp_address_u.ip_addr.lh, 212 255 &res.router_address.bp_address_u.ip_addr.impno); 213 214 return (&res); 215 } 216 errno = e; 217 if (debug) 218 warn("whoami failed"); 219 if (dolog) 220 syslog(LOG_NOTICE, "whoami failed %m"); 221 return (NULL); 222 } 223 224 225 bp_getfile_res * 226 bootparamproc_getfile_1_svc(getfile, rqstp) 227 bp_getfile_arg *getfile; 228 struct svc_req *rqstp; 229 { 230 static bp_getfile_res res; 231 struct hostent *he; 232 int err; 233 234 if (debug) 235 warnx("getfile got question for \"%s\" and file \"%s\"", 236 getfile->client_name, getfile->file_id); 237 238 if (dolog) 239 syslog(LOG_NOTICE, 240 "getfile got question for \"%s\" and file \"%s\"", 241 getfile->client_name, getfile->file_id); 242 243 he = NULL; 244 he = gethostbyname(getfile->client_name); 245 if (!he) 246 goto failed; 247 248 strncpy(askname, he->h_name, sizeof(askname)); 249 askname[sizeof(askname)-1] = 0; 250 err = lookup_bootparam(askname, NULL, getfile->file_id, 251 &res.server_name, &res.server_path); 252 if (err == 0) { 253 he = gethostbyname(res.server_name); 254 if (!he) 255 goto failed; 256 memmove(&res.server_address.bp_address_u.ip_addr, 257 he->h_addr, 4); 258 res.server_address.address_type = IP_ADDR_TYPE; 259 } else if (err == ENOENT && !strcmp(getfile->file_id, "dump")) { 260 /* Special for dump, answer with null strings. */ 261 res.server_name[0] = '\0'; 262 res.server_path[0] = '\0'; 263 memset(&res.server_address.bp_address_u.ip_addr, 0, 4); 264 } else { 265 failed: 266 if (debug) 267 warnx("getfile failed for %s", 268 getfile->client_name); 269 if (dolog) 270 syslog(LOG_NOTICE, 271 "getfile failed for %s", getfile->client_name); 272 return (NULL); 273 } 274 275 if (debug) 276 warnx( 277 "returning server:%s path:%s address: %d.%d.%d.%d", 278 res.server_name, res.server_path, 279 255 & res.server_address.bp_address_u.ip_addr.net, 280 255 & res.server_address.bp_address_u.ip_addr.host, 281 255 & res.server_address.bp_address_u.ip_addr.lh, 282 255 & res.server_address.bp_address_u.ip_addr.impno); 283 if (dolog) 284 syslog(LOG_NOTICE, 285 "returning server:%s path:%s address: %d.%d.%d.%d", 286 res.server_name, res.server_path, 287 255 & res.server_address.bp_address_u.ip_addr.net, 288 255 & res.server_address.bp_address_u.ip_addr.host, 289 255 & res.server_address.bp_address_u.ip_addr.lh, 290 255 & res.server_address.bp_address_u.ip_addr.impno); 291 return (&res); 292 } 293 294 295 int 296 lookup_bootparam(client, client_canonical, id, server, path) 297 char *client; 298 char *client_canonical; 299 char *id; 300 char **server; 301 char **path; 302 { 303 FILE *f = fopen(bootpfile, "r"); 304 #ifdef YP 305 static char *ypbuf = NULL; 306 static int ypbuflen = 0; 307 #endif 308 static char buf[BUFSIZ]; 309 char *bp, *word = NULL; 310 size_t idlen = id == NULL ? 0 : strlen(id); 311 int contin = 0; 312 int found = 0; 313 314 if (f == NULL) 315 return EINVAL; /* ? */ 316 317 while (fgets(buf, sizeof buf, f)) { 318 int wascontin = contin; 319 contin = buf[strlen(buf) - 2] == '\\'; 320 bp = buf + strspn(buf, " \t\n"); 321 322 switch (wascontin) { 323 case -1: 324 /* Continuation of uninteresting line */ 325 contin *= -1; 326 continue; 327 case 0: 328 /* New line */ 329 contin *= -1; 330 if (*bp == '#') 331 continue; 332 if ((word = strsep(&bp, " \t\n")) == NULL) 333 continue; 334 #ifdef YP 335 /* A + in the file means try YP now */ 336 if (!strcmp(word, "+")) { 337 char *ypdom; 338 339 if (yp_get_default_domain(&ypdom) || 340 yp_match(ypdom, "bootparams", client, 341 strlen(client), &ypbuf, &ypbuflen)) 342 continue; 343 bp = ypbuf; 344 word = client; 345 contin *= -1; 346 break; 347 } 348 #endif 349 if (debug) 350 warnx("match %s with %s", word, client); 351 /* See if this line's client is the one we are 352 * looking for */ 353 if (strcasecmp(word, client) != 0) { 354 /* 355 * If it didn't match, try getting the 356 * canonical host name of the client 357 * on this line and comparing that to 358 * the client we are looking for 359 */ 360 struct hostent *hp = gethostbyname(word); 361 if (hp == NULL ) { 362 if (debug) 363 warnx( 364 "Unknown bootparams host %s", word); 365 if (dolog) 366 syslog(LOG_NOTICE, 367 "Unknown bootparams host %s", word); 368 continue; 369 } 370 if (strcasecmp(hp->h_name, client)) 371 continue; 372 } 373 contin *= -1; 374 break; 375 case 1: 376 /* Continued line we want to parse below */ 377 break; 378 } 379 380 if (client_canonical) 381 strncpy(client_canonical, word, MAX_MACHINE_NAME); 382 383 /* We have found a line for CLIENT */ 384 if (id == NULL) { 385 (void) fclose(f); 386 return 0; 387 } 388 389 /* Look for a value for the parameter named by ID */ 390 while ((word = strsep(&bp, " \t\n")) != NULL) { 391 if (!strncmp(word, id, idlen) && word[idlen] == '=') { 392 /* We have found the entry we want */ 393 *server = &word[idlen + 1]; 394 *path = strchr(*server, ':'); 395 if (*path == NULL) 396 /* Malformed entry */ 397 continue; 398 *(*path)++ = '\0'; 399 (void) fclose(f); 400 return 0; 401 } 402 } 403 404 found = 1; 405 } 406 407 (void) fclose(f); 408 return found ? ENOENT : EPERM; 409 } 410 411 void 412 usage() 413 { 414 fprintf(stderr, 415 "usage: %s [-d] [-s] [-r router] [-f bootparmsfile]\n", __progname); 416 exit(1); 417 } 418 419 static int 420 get_localaddr(ifname, sin) 421 const char *ifname; 422 struct sockaddr_in *sin; 423 { 424 struct ifaddrs *ifap, *ifa; 425 426 if (getifaddrs(&ifap) != 0) 427 return -1; 428 429 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 430 if (ifname && strcmp(ifname, ifa->ifa_name) != 0) 431 continue; 432 if (ifa->ifa_addr->sa_family != AF_INET) 433 continue; 434 if (ifa->ifa_addr->sa_len != sizeof(*sin)) 435 continue; 436 437 /* no loopback please */ 438 #ifdef IFF_LOOPBACK 439 if (ifa->ifa_flags & IFF_LOOPBACK) 440 continue; 441 #else 442 if (strncmp(ifa->ifa_name, "lo", 2) == 0 && 443 (isdigit(ifa->ifa_name[2]) || ifa->ifa_name[2] == '\0')) 444 continue; 445 #endif 446 447 /* XXX more sanity checks? */ 448 449 /* candidate found */ 450 memcpy(sin, ifa->ifa_addr, ifa->ifa_addr->sa_len); 451 freeifaddrs(ifap); 452 return 0; 453 } 454 455 /* no candidate */ 456 freeifaddrs(ifap); 457 return -1; 458 } 459
Indexes created Sat Sep 20 22:09:52 GMT 2025