1 /* $OpenBSD: bootparamd.c,v 1.22 2021/11/15 15:14:24 millert 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@nada.kth.se> 7 * 8 * Various small changes by Theo de Raadt <deraadt@fsa.ca> 9 */ 10 11 #include <sys/types.h> 12 #include <sys/ioctl.h> 13 #include <sys/stat.h> 14 #include <sys/socket.h> 15 16 #include <rpc/rpc.h> 17 #include <rpcsvc/bootparam_prot.h> 18 #include <rpcsvc/ypclnt.h> 19 #include <rpcsvc/yp_prot.h> 20 #include <arpa/inet.h> 21 22 #include <stdio.h> 23 #include <netdb.h> 24 #include <ctype.h> 25 #include <syslog.h> 26 #include <string.h> 27 #include <unistd.h> 28 #include <err.h> 29 #include <stdlib.h> 30 31 #include "pathnames.h" 32 33 #define MAXLEN 800 34 35 struct hostent *he; 36 static char hostname[MAX_MACHINE_NAME]; 37 static char askname[MAX_MACHINE_NAME]; 38 static char domain_name[MAX_MACHINE_NAME]; 39 40 extern void bootparamprog_1(struct svc_req *, SVCXPRT *); 41 int lookup_bootparam(char *client, char *client_canonical, char *id, 42 char **server, char **path); 43 44 int _rpcsvcdirty = 0; 45 int _rpcpmstart = 0; 46 int debug = 0; 47 int dolog = 0; 48 struct in_addr route_addr; 49 struct sockaddr_in my_addr; 50 extern char *__progname; 51 char *bootpfile = _PATH_BOOTPARAMS; 52 53 54 static void 55 usage(void) 56 { 57 extern char *__progname; 58 fprintf(stderr, "usage: %s [-ds] [-f file] [-r router]\n", 59 __progname); 60 exit(1); 61 } 62 63 /* 64 * ever familiar 65 */ 66 int 67 main(int argc, char *argv[]) 68 { 69 struct hostent *he; 70 struct stat buf; 71 SVCXPRT *transp; 72 int c; 73 74 while ((c = getopt(argc, argv, "dsr:f:")) != -1) 75 switch (c) { 76 case 'd': 77 debug = 1; 78 break; 79 case 'r': 80 if (inet_aton(optarg, &route_addr) == 1) 81 break; 82 he = gethostbyname(optarg); 83 if (!he) { 84 warnx("no such host: %s", optarg); 85 usage(); 86 } 87 bcopy(he->h_addr, &route_addr.s_addr, 88 sizeof(route_addr.s_addr)); 89 break; 90 case 'f': 91 bootpfile = optarg; 92 break; 93 case 's': 94 dolog = 1; 95 #ifndef LOG_DAEMON 96 openlog(__progname, 0, 0); 97 #else 98 openlog(__progname, 0, LOG_DAEMON); 99 setlogmask(LOG_UPTO(LOG_NOTICE)); 100 #endif 101 break; 102 default: 103 usage(); 104 } 105 106 if (stat(bootpfile, &buf)) 107 err(1, "%s", bootpfile); 108 109 if (!route_addr.s_addr) { 110 get_myaddress(&my_addr); 111 bcopy(&my_addr.sin_addr.s_addr, &route_addr.s_addr, 112 sizeof(route_addr.s_addr)); 113 } 114 if (!debug) { 115 if (daemon(0, 0)) 116 err(1, "can't detach from terminal"); 117 } 118 119 (void) pmap_unset(BOOTPARAMPROG, BOOTPARAMVERS); 120 121 transp = svcudp_create(RPC_ANYSOCK); 122 if (transp == NULL) 123 errx(1, "can't create udp service"); 124 125 if (!svc_register(transp, BOOTPARAMPROG, BOOTPARAMVERS, bootparamprog_1, 126 IPPROTO_UDP)) 127 errx(1, "unable to register BOOTPARAMPROG version %ld, udp", 128 BOOTPARAMVERS); 129 130 if (pledge("stdio rpath dns", NULL) == -1) 131 err(1, "pledge"); 132 133 svc_run(); 134 errx(1, "svc_run returned"); 135 } 136 137 bp_whoami_res * 138 bootparamproc_whoami_1_svc(bp_whoami_arg *whoami, struct svc_req *rqstp) 139 { 140 in_addr_t haddr; 141 static bp_whoami_res res; 142 143 if (debug) 144 warnx("whoami got question for %d.%d.%d.%d", 145 255 & whoami->client_address.bp_address_u.ip_addr.net, 146 255 & whoami->client_address.bp_address_u.ip_addr.host, 147 255 & whoami->client_address.bp_address_u.ip_addr.lh, 148 255 & whoami->client_address.bp_address_u.ip_addr.impno); 149 if (dolog) 150 syslog(LOG_NOTICE, "whoami got question for %d.%d.%d.%d", 151 255 & whoami->client_address.bp_address_u.ip_addr.net, 152 255 & whoami->client_address.bp_address_u.ip_addr.host, 153 255 & whoami->client_address.bp_address_u.ip_addr.lh, 154 255 & whoami->client_address.bp_address_u.ip_addr.impno); 155 156 bcopy(&whoami->client_address.bp_address_u.ip_addr, 157 &haddr, sizeof(haddr)); 158 he = gethostbyaddr(&haddr, sizeof(haddr), AF_INET); 159 if (!he) 160 goto failed; 161 162 if (debug) 163 warnx("This is host %s", he->h_name); 164 if (dolog) 165 syslog(LOG_NOTICE, "This is host %s", he->h_name); 166 167 strlcpy(askname, he->h_name, sizeof askname); 168 if (!lookup_bootparam(askname, hostname, NULL, NULL, NULL)) { 169 res.client_name = hostname; 170 getdomainname(domain_name, MAX_MACHINE_NAME); 171 res.domain_name = domain_name; 172 173 if (res.router_address.address_type != IP_ADDR_TYPE) { 174 res.router_address.address_type = IP_ADDR_TYPE; 175 bcopy(&route_addr.s_addr, 176 &res.router_address.bp_address_u.ip_addr, 4); 177 } 178 if (debug) 179 warnx("Returning %s %s %d.%d.%d.%d", 180 res.client_name, res.domain_name, 181 255 & res.router_address.bp_address_u.ip_addr.net, 182 255 & res.router_address.bp_address_u.ip_addr.host, 183 255 & res.router_address.bp_address_u.ip_addr.lh, 184 255 & res.router_address.bp_address_u.ip_addr.impno); 185 if (dolog) 186 syslog(LOG_NOTICE, "Returning %s %s %d.%d.%d.%d", 187 res.client_name, res.domain_name, 188 255 & res.router_address.bp_address_u.ip_addr.net, 189 255 & res.router_address.bp_address_u.ip_addr.host, 190 255 & res.router_address.bp_address_u.ip_addr.lh, 191 255 & res.router_address.bp_address_u.ip_addr.impno); 192 return (&res); 193 } 194 failed: 195 if (debug) 196 warnx("whoami failed"); 197 if (dolog) 198 syslog(LOG_NOTICE, "whoami failed"); 199 return (NULL); 200 } 201 202 203 bp_getfile_res * 204 bootparamproc_getfile_1_svc(bp_getfile_arg *getfile, struct svc_req *rqstp) 205 { 206 static bp_getfile_res res; 207 int error; 208 209 if (debug) 210 warnx("getfile got question for \"%s\" and file \"%s\"", 211 getfile->client_name, getfile->file_id); 212 213 if (dolog) 214 syslog(LOG_NOTICE, 215 "getfile got question for \"%s\" and file \"%s\"", 216 getfile->client_name, getfile->file_id); 217 218 he = NULL; 219 he = gethostbyname(getfile->client_name); 220 if (!he) 221 goto failed; 222 223 strlcpy(askname, he->h_name, sizeof askname); 224 error = lookup_bootparam(askname, NULL, getfile->file_id, 225 &res.server_name, &res.server_path); 226 if (error == 0) { 227 he = gethostbyname(res.server_name); 228 if (!he) 229 goto failed; 230 bcopy(he->h_addr, &res.server_address.bp_address_u.ip_addr, 4); 231 res.server_address.address_type = IP_ADDR_TYPE; 232 } else if (error == ENOENT && !strcmp(getfile->file_id, "dump")) { 233 /* Special for dump, answer with null strings. */ 234 res.server_name[0] = '\0'; 235 res.server_path[0] = '\0'; 236 bzero(&res.server_address.bp_address_u.ip_addr, 4); 237 } else { 238 failed: 239 if (debug) 240 warnx("getfile failed for %s", getfile->client_name); 241 if (dolog) 242 syslog(LOG_NOTICE, 243 "getfile failed for %s", getfile->client_name); 244 return (NULL); 245 } 246 247 if (debug) 248 warnx("returning server:%s path:%s address: %d.%d.%d.%d", 249 res.server_name, res.server_path, 250 255 & res.server_address.bp_address_u.ip_addr.net, 251 255 & res.server_address.bp_address_u.ip_addr.host, 252 255 & res.server_address.bp_address_u.ip_addr.lh, 253 255 & res.server_address.bp_address_u.ip_addr.impno); 254 if (dolog) 255 syslog(LOG_NOTICE, 256 "returning server:%s path:%s address: %d.%d.%d.%d", 257 res.server_name, res.server_path, 258 255 & res.server_address.bp_address_u.ip_addr.net, 259 255 & res.server_address.bp_address_u.ip_addr.host, 260 255 & res.server_address.bp_address_u.ip_addr.lh, 261 255 & res.server_address.bp_address_u.ip_addr.impno); 262 return (&res); 263 } 264 265 int 266 lookup_bootparam(char *client, char *client_canonical, char *id, 267 char **server, char **path) 268 { 269 FILE *f; 270 static char buf[BUFSIZ]; 271 char *bp, *word = NULL; 272 size_t idlen = id == NULL ? 0 : strlen(id); 273 int contin = 0, found = 0; 274 275 f = fopen(bootpfile, "r"); 276 if (f == NULL) 277 return EINVAL; /* ? */ 278 279 while (fgets(buf, sizeof buf, f)) { 280 int wascontin = contin; 281 282 contin = buf[strlen(buf) - 2] == '\\'; 283 bp = buf + strspn(buf, " \t\n"); 284 285 switch (wascontin) { 286 case -1: 287 /* Continuation of uninteresting line */ 288 contin *= -1; 289 continue; 290 case 0: 291 /* New line */ 292 contin *= -1; 293 if (*bp == '#') 294 continue; 295 if ((word = strsep(&bp, " \t\n")) == NULL) 296 continue; 297 /* See if this line's client is the one we are 298 * looking for */ 299 if (strcasecmp(word, client) != 0) { 300 /* 301 * If it didn't match, try getting the 302 * canonical host name of the client 303 * on this line and comparing that to 304 * the client we are looking for 305 */ 306 struct hostent *hp = gethostbyname(word); 307 if (hp == NULL || strcasecmp(hp->h_name, client)) 308 continue; 309 } 310 contin *= -1; 311 break; 312 case 1: 313 /* Continued line we want to parse below */ 314 break; 315 } 316 317 if (client_canonical) 318 strlcpy(client_canonical, word, MAX_MACHINE_NAME); 319 320 /* We have found a line for CLIENT */ 321 if (id == NULL) { 322 (void) fclose(f); 323 return 0; 324 } 325 326 /* Look for a value for the parameter named by ID */ 327 while ((word = strsep(&bp, " \t\n")) != NULL) { 328 if (!strncmp(word, id, idlen) && word[idlen] == '=') { 329 /* We have found the entry we want */ 330 *server = &word[idlen + 1]; 331 *path = strchr(*server, ':'); 332 if (*path == NULL) 333 /* Malformed entry */ 334 continue; 335 *(*path)++ = '\0'; 336 (void) fclose(f); 337 return 0; 338 } 339 } 340 341 found = 1; 342 } 343 344 (void) fclose(f); 345 return found ? ENOENT : EPERM; 346 } 347