/* $NetBSD: bootparamd.c,v 1.46.44.1 2019/08/16 19:25:31 martin Exp $ */ /* * This code is not copyright, and is placed in the public domain. * Feel free to use and modify. Please send modifications and/or * suggestions + bug fixes to Klas Heggemann * * Various small changes by Theo de Raadt * Parser rewritten (adding YP support) by Roland McGrath */ #include #ifndef lint __RCSID("$NetBSD: bootparamd.c,v 1.46.44.1 2019/08/16 19:25:31 martin Exp $"); #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef YP #include #endif #include "pathnames.h" #define MAXLEN 800 static char hostname[MAX_MACHINE_NAME]; static char askname[MAX_MACHINE_NAME]; static char domain_name[MAX_MACHINE_NAME]; extern void bootparamprog_1(struct svc_req *, SVCXPRT *); extern int _rpcsvcdirty; int _rpcpmstart = 0; int debug = 0; int dolog = 0; struct in_addr route_addr; struct sockaddr_in my_addr; const char *bootpfile = _PATH_BOOTPARAMS; char *iface = NULL; static int lookup_bootparam(char *, char *, char *, char **, char **); __dead static void usage(void); static int get_localaddr(const char *, struct sockaddr_in *); /* * ever familiar */ int main(int argc, char *argv[]) { SVCXPRT *transp; struct hostent *he; struct stat buf; int c; while ((c = getopt(argc, argv, "di:sr:f:")) != -1) switch (c) { case 'd': debug = 1; break; case 'i': iface = optarg; break; case 'r': if (isdigit((unsigned char)*optarg)) { if (inet_aton(optarg, &route_addr) != 0) break; } he = gethostbyname(optarg); if (he == 0) { warnx("no such host: %s", optarg); usage(); } memmove(&route_addr.s_addr, he->h_addr, he->h_length); break; case 'f': bootpfile = optarg; break; case 's': dolog = 1; #ifndef LOG_DAEMON openlog("rpc.bootparamd", 0, 0); #else openlog("rpc.bootparamd", 0, LOG_DAEMON); setlogmask(LOG_UPTO(LOG_NOTICE)); #endif break; default: usage(); } if (stat(bootpfile, &buf)) err(1, "%s", bootpfile); if (route_addr.s_addr == 0) { if (get_localaddr(NULL, &my_addr) != 0) errx(1, "router address not found"); route_addr.s_addr = my_addr.sin_addr.s_addr; } if (!debug) { if (daemon(0, 0)) err(1, "can't detach from terminal"); } pidfile(NULL); (void) pmap_unset(BOOTPARAMPROG, BOOTPARAMVERS); transp = svcudp_create(RPC_ANYSOCK); if (transp == NULL) errx(1, "can't create udp service"); if (!svc_register(transp, BOOTPARAMPROG, BOOTPARAMVERS, bootparamprog_1, IPPROTO_UDP)) /* * Do NOT change the "%u" in the format string below to "%lu". If your * build fails update the "rpcgen" program and use "make cleandir" and * "make includes" in "src/lib/librpcsvc" afterwards. */ errx(1, "unable to register BOOTPARAMPROG version %u, udp", BOOTPARAMVERS); svc_run(); errx(1, "svc_run returned"); } bp_whoami_res * bootparamproc_whoami_1_svc(bp_whoami_arg *whoami, struct svc_req *rqstp) { static bp_whoami_res res; struct hostent *he; struct in_addr haddr; int e; if (debug) warnx("whoami got question for %d.%d.%d.%d", 255 & whoami->client_address.bp_address_u.ip_addr.net, 255 & whoami->client_address.bp_address_u.ip_addr.host, 255 & whoami->client_address.bp_address_u.ip_addr.lh, 255 & whoami->client_address.bp_address_u.ip_addr.impno); if (dolog) syslog(LOG_NOTICE, "whoami got question for %d.%d.%d.%d", 255 & whoami->client_address.bp_address_u.ip_addr.net, 255 & whoami->client_address.bp_address_u.ip_addr.host, 255 & whoami->client_address.bp_address_u.ip_addr.lh, 255 & whoami->client_address.bp_address_u.ip_addr.impno); memmove((char *) &haddr, (char *) &whoami->client_address.bp_address_u.ip_addr, sizeof(haddr)); he = gethostbyaddr((char *) &haddr, sizeof(haddr), AF_INET); if (he) { (void)strlcpy(askname, he->h_name, sizeof(askname)); } else { (void)strlcpy(askname, inet_ntoa(haddr), sizeof(askname)); } if (debug) warnx("This is host %s", askname); if (dolog) syslog(LOG_NOTICE, "This is host %s", askname); if ((e = lookup_bootparam(askname, hostname, NULL, NULL, NULL)) == 0) { res.client_name = hostname; getdomainname(domain_name, MAX_MACHINE_NAME); res.domain_name = domain_name; if (res.router_address.address_type != IP_ADDR_TYPE) { res.router_address.address_type = IP_ADDR_TYPE; memmove(&res.router_address.bp_address_u.ip_addr, &route_addr.s_addr,4); } if (debug) warnx("Returning %s %s %d.%d.%d.%d", res.client_name, res.domain_name, 255 & res.router_address.bp_address_u.ip_addr.net, 255 & res.router_address.bp_address_u.ip_addr.host, 255 & res.router_address.bp_address_u.ip_addr.lh, 255 &res.router_address.bp_address_u.ip_addr.impno); if (dolog) syslog(LOG_NOTICE, "Returning %s %s %d.%d.%d.%d", res.client_name, res.domain_name, 255 & res.router_address.bp_address_u.ip_addr.net, 255 & res.router_address.bp_address_u.ip_addr.host, 255 & res.router_address.bp_address_u.ip_addr.lh, 255 &res.router_address.bp_address_u.ip_addr.impno); return (&res); } errno = e; if (debug) warn("whoami failed"); if (dolog) syslog(LOG_NOTICE, "whoami failed %m"); return (NULL); } bp_getfile_res * bootparamproc_getfile_1_svc(bp_getfile_arg *getfile, struct svc_req *rqstp) { static bp_getfile_res res; struct hostent *he; int error; if (debug) warnx("getfile got question for \"%s\" and file \"%s\"", getfile->client_name, getfile->file_id); if (dolog) syslog(LOG_NOTICE, "getfile got question for \"%s\" and file \"%s\"", getfile->client_name, getfile->file_id); he = NULL; he = gethostbyname(getfile->client_name); if (!he) { if (debug) warnx("getfile can't resolve client %s", getfile->client_name); if (dolog) syslog(LOG_NOTICE, "getfile can't resolve client %s", getfile->client_name); return (NULL); } (void)strlcpy(askname, he->h_name, sizeof(askname)); error = lookup_bootparam(askname, NULL, getfile->file_id, &res.server_name, &res.server_path); if (error == 0) { he = gethostbyname(res.server_name); if (!he) { if (debug) warnx("getfile can't resolve server %s for %s", res.server_name, getfile->client_name); if (dolog) syslog(LOG_NOTICE, "getfile can't resolve server %s for %s", res.server_name, getfile->client_name); return (NULL); } memmove(&res.server_address.bp_address_u.ip_addr, he->h_addr, 4); res.server_address.address_type = IP_ADDR_TYPE; } else if (error == ENOENT && !strcmp(getfile->file_id, "dump")) { /* Special for dump, answer with null strings. */ res.server_name[0] = '\0'; res.server_path[0] = '\0'; memset(&res.server_address.bp_address_u.ip_addr, 0, 4); } else { if (debug) warnx("getfile lookup failed for %s", getfile->client_name); if (dolog) syslog(LOG_NOTICE, "getfile lookup failed for %s", getfile->client_name); return (NULL); } if (debug) warnx( "returning server:%s path:%s address: %d.%d.%d.%d", res.server_name, res.server_path, 255 & res.server_address.bp_address_u.ip_addr.net, 255 & res.server_address.bp_address_u.ip_addr.host, 255 & res.server_address.bp_address_u.ip_addr.lh, 255 & res.server_address.bp_address_u.ip_addr.impno); if (dolog) syslog(LOG_NOTICE, "returning server:%s path:%s address: %d.%d.%d.%d", res.server_name, res.server_path, 255 & res.server_address.bp_address_u.ip_addr.net, 255 & res.server_address.bp_address_u.ip_addr.host, 255 & res.server_address.bp_address_u.ip_addr.lh, 255 & res.server_address.bp_address_u.ip_addr.impno); return (&res); } static int lookup_bootparam(char *client, char *client_canonical, char *id, char **server, char **path) { FILE *f = fopen(bootpfile, "r"); #ifdef YP static char *ypbuf = NULL; static int ypbuflen = 0; #endif static char buf[BUFSIZ]; char *canon = NULL, *bp, *word = NULL; size_t idlen = id == NULL ? 0 : strlen(id); int contin = 0; int found = 0; if (f == NULL) return EINVAL; /* ? */ while (fgets(buf, sizeof buf, f)) { int wascontin = contin; contin = buf[strlen(buf) - 2] == '\\'; bp = buf + strspn(buf, " \t\n"); switch (wascontin) { case -1: /* Continuation of uninteresting line */ contin *= -1; continue; case 0: /* New line */ contin *= -1; if (*bp == '#') continue; if ((word = strsep(&bp, " \t\n")) == NULL) continue; #ifdef YP /* A + in the file means try YP now */ if (!strcmp(word, "+")) { char *ypdom; if (yp_get_default_domain(&ypdom) || yp_match(ypdom, "bootparams", client, strlen(client), &ypbuf, &ypbuflen)) continue; bp = ypbuf; word = client; contin *= -1; break; } #endif if (debug) warnx("match %s with %s", word, client); #define HASGLOB(str) \ (strchr(str, '*') != NULL || \ strchr(str, '?') != NULL || \ strchr(str, '[') != NULL || \ strchr(str, ']') != NULL) /* See if this line's client is the one we are * looking for */ if (fnmatch(word, client, FNM_CASEFOLD) == 0) { /* * Match. The token may be globbed, we * can't just return that as the canonical * name. Check to see if the token has any * globbing characters in it (*, ?, [, ]). * If so, just return the name we already * have. Otherwise, return the token. */ if (HASGLOB(word)) canon = client; else canon = word; } else { struct hostent *hp; /* * If it didn't match, try getting the * canonical host name of the client * on this line, if it's not a glob, * and comparing it to the client we * are looking up. */ if (HASGLOB(word)) { if (debug) warnx("Skipping non-match: %s", word); continue; } if ((hp = gethostbyname(word)) == NULL) { if (debug) warnx( "Unknown bootparams host %s", word); if (dolog) syslog(LOG_NOTICE, "Unknown bootparams host %s", word); continue; } if (strcasecmp(hp->h_name, client) != 0) continue; canon = hp->h_name; } #undef HASGLOB contin *= -1; break; case 1: /* Continued line we want to parse below */ break; } assert(canon != NULL); if (client_canonical) strncpy(client_canonical, canon, MAX_MACHINE_NAME); /* We have found a line for CLIENT */ if (id == NULL) { (void) fclose(f); return 0; } /* Look for a value for the parameter named by ID */ while ((word = strsep(&bp, " \t\n")) != NULL) { if (!strncmp(word, id, idlen) && word[idlen] == '=') { /* We have found the entry we want */ *server = &word[idlen + 1]; *path = strchr(*server, ':'); if (*path == NULL) /* Malformed entry */ continue; *(*path)++ = '\0'; (void) fclose(f); return 0; } } found = 1; } (void) fclose(f); return found ? ENOENT : EPERM; } static void usage(void) { fprintf(stderr, "usage: %s [-ds] [-i interface] [-r router] [-f bootparamsfile]\n", getprogname()); exit(1); } static int get_localaddr(const char *ifname, struct sockaddr_in *sin) { struct ifaddrs *ifap, *ifa; if (getifaddrs(&ifap) != 0) return -1; for (ifa = ifap; ifa; ifa = ifa->ifa_next) { if (ifname && strcmp(ifname, ifa->ifa_name) != 0) continue; if (ifa->ifa_addr->sa_family != AF_INET) continue; if (ifa->ifa_addr->sa_len != sizeof(*sin)) continue; /* no loopback please */ #ifdef IFF_LOOPBACK if (ifa->ifa_flags & IFF_LOOPBACK) continue; #else if (strncmp(ifa->ifa_name, "lo", 2) == 0 && (isdigit(ifa->ifa_name[2]) || ifa->ifa_name[2] == '\0')) continue; #endif if (!iface || strcmp(ifa->ifa_name, iface) == 0) ; else continue; /* candidate found */ memcpy(sin, ifa->ifa_addr, ifa->ifa_addr->sa_len); freeifaddrs(ifap); return 0; } /* no candidate */ freeifaddrs(ifap); return -1; }