Edit
IABSD.fr/src/usr.sbin/rpc.bootparamd/bootparamd.c
florian
- usr.sbin/rpc.bootparamd/bootparamd.c
-
/* $OpenBSD: bootparamd.c,v 1.23 2024/08/21 14:59:49 florian 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 <klas@nada.kth.se> * * Various small changes by Theo de Raadt <deraadt@fsa.ca> */ #include <sys/types.h> #include <sys/ioctl.h> #include <sys/stat.h> #include <sys/socket.h> #include <rpc/rpc.h> #include <rpcsvc/bootparam_prot.h> #include <rpcsvc/ypclnt.h> #include <rpcsvc/yp_prot.h> #include <arpa/inet.h> #include <stdio.h> #include <netdb.h> #include <ctype.h> #include <syslog.h> #include <string.h> #include <unistd.h> #include <err.h> #include <stdlib.h> #include "pathnames.h" #define MAXLEN 800 struct hostent *he; 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 *); int lookup_bootparam(char *client, char *client_canonical, char *id, char **server, char **path); int _rpcsvcdirty = 0; int _rpcpmstart = 0; int debug = 0; int dolog = 0; struct in_addr route_addr; struct sockaddr_in my_addr; extern char *__progname; char *bootpfile = _PATH_BOOTPARAMS; static void usage(void) { extern char *__progname; fprintf(stderr, "usage: %s [-ds] [-f file] [-r router]\n", __progname); exit(1); } /* * ever familiar */ int main(int argc, char *argv[]) { struct addrinfo hints, *res; struct stat buf; SVCXPRT *transp; int c; while ((c = getopt(argc, argv, "dsr:f:")) != -1) switch (c) { case 'd': debug = 1; break; case 'r': memset(&hints, 0, sizeof(hints)); hints.ai_family = AF_INET; if (getaddrinfo(optarg, NULL, &hints, &res) != 0) { warnx("no such host: %s", optarg); usage(); } route_addr = ((struct sockaddr_in *)res->ai_addr)->sin_addr; freeaddrinfo(res); break; case 'f': bootpfile = optarg; break; case 's': dolog = 1; #ifndef LOG_DAEMON openlog(__progname, 0, 0); #else openlog(__progname, 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) { get_myaddress(&my_addr); bcopy(&my_addr.sin_addr.s_addr, &route_addr.s_addr, sizeof(route_addr.s_addr)); } if (!debug) { if (daemon(0, 0)) err(1, "can't detach from terminal"); } (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)) errx(1, "unable to register BOOTPARAMPROG version %ld, udp", BOOTPARAMVERS); if (pledge("stdio rpath dns", NULL) == -1) err(1, "pledge"); svc_run(); errx(1, "svc_run returned"); } bp_whoami_res * bootparamproc_whoami_1_svc(bp_whoami_arg *whoami, struct svc_req *rqstp) { in_addr_t haddr; static bp_whoami_res res; 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); bcopy(&whoami->client_address.bp_address_u.ip_addr, &haddr, sizeof(haddr)); he = gethostbyaddr(&haddr, sizeof(haddr), AF_INET); if (!he) goto failed; if (debug) warnx("This is host %s", he->h_name); if (dolog) syslog(LOG_NOTICE, "This is host %s", he->h_name); strlcpy(askname, he->h_name, sizeof askname); if (!lookup_bootparam(askname, hostname, NULL, NULL, NULL)) { 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; bcopy(&route_addr.s_addr, &res.router_address.bp_address_u.ip_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); } failed: if (debug) warnx("whoami failed"); if (dolog) syslog(LOG_NOTICE, "whoami failed"); return (NULL); } bp_getfile_res * bootparamproc_getfile_1_svc(bp_getfile_arg *getfile, struct svc_req *rqstp) { static bp_getfile_res res; 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) goto failed; 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) goto failed; bcopy(he->h_addr, &res.server_address.bp_address_u.ip_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'; bzero(&res.server_address.bp_address_u.ip_addr, 4); } else { failed: if (debug) warnx("getfile failed for %s", getfile->client_name); if (dolog) syslog(LOG_NOTICE, "getfile 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); } int lookup_bootparam(char *client, char *client_canonical, char *id, char **server, char **path) { FILE *f; static char buf[BUFSIZ]; char *bp, *word = NULL; size_t idlen = id == NULL ? 0 : strlen(id); int contin = 0, found = 0; f = fopen(bootpfile, "r"); 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; /* See if this line's client is the one we are * looking for */ if (strcasecmp(word, client) != 0) { /* * If it didn't match, try getting the * canonical host name of the client * on this line and comparing that to * the client we are looking for */ struct hostent *hp = gethostbyname(word); if (hp == NULL || strcasecmp(hp->h_name, client)) continue; } contin *= -1; break; case 1: /* Continued line we want to parse below */ break; } if (client_canonical) strlcpy(client_canonical, word, 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; }