/*- * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1990, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)portmap.c 8.1 (Berkeley) 6/6/93"; #endif static const char rcsid[] = "$FreeBSD: src/usr.sbin/portmap/portmap.c,v 1.10.2.1 2001/04/09 23:35:19 dillon Exp $"; #endif /* not lint */ /* @(#)portmap.c 2.3 88/08/11 4.0 RPCSRC static char sccsid[] = "@(#)portmap.c 1.32 87/08/06 Copyr 1984 Sun Micro"; */ /* * portmap.c, Implements the program,version to port number mapping for * rpc. */ /* * Sun RPC is a product of Sun Microsystems, Inc. and is provided for * unrestricted use provided that this legend is included on all tape * media and as a part of the software program in whole or part. Users * may copy or modify Sun RPC without charge, but are not authorized * to license or distribute it to anyone else except as part of a product or * program developed by the user. * * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. * * Sun RPC is provided with no support and without any obligation on the * part of Sun Microsystems, Inc. to assist in its use, correction, * modification or enhancement. * * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC * OR ANY PART THEREOF. * * In no event will Sun Microsystems, Inc. be liable for any lost revenue * or profits or other special, indirect and consequential damages, even if * Sun has been advised of the possibility of such damages. * * Sun Microsystems, Inc. * 2550 Garcia Avenue * Mountain View, California 94043 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef USE_RENDEZVOUS #include #endif #include "pmap_check.h" extern void get_myaddress(struct sockaddr_in *); static void reg_service __P((struct svc_req *, SVCXPRT *)); static void callit __P((struct svc_req *, SVCXPRT *)); static void usage __P((void)); static bool should_timeout(void); struct pmaprlist { struct pmaplist pl; #ifdef USE_RENDEZVOUS dns_service_discovery_ref mdnsref; #endif }; struct pmaprlist *pmaplist; int debugging = 0; static bool use_launchd = false; extern int svc_maxfd; #ifdef USE_RENDEZVOUS static void mdns_callback(DNSServiceRegistrationReplyErrorType err, void *d) { return; } #endif int main(argc, argv) int argc; char **argv; { SVCXPRT *xprt; int sock, c, l_on_d_fd = -1, sock_opt = 1; char **hosts = NULL; int nhosts = 0; struct sockaddr_in addr; int len = sizeof(struct sockaddr_in); register struct pmaplist *pml; launch_data_t msg, resp; fd_set readfds; openlog(getprogname(), LOG_PID | LOG_PERROR, LOG_DAEMON); signal(SIGPIPE, SIG_IGN); if (1 == getppid()) { use_launchd = true; } else { msg = launch_data_alloc(LAUNCH_DATA_DICTIONARY); launch_data_dict_insert(msg, launch_data_new_string("com.apple.portmap"), LAUNCH_KEY_GETJOB); resp = launch_msg(msg); if (resp == NULL) { syslog(LOG_ERR, "launch_msg(): %m"); exit(1); } launch_data_free(msg); switch (launch_data_get_type(resp)) { case LAUNCH_DATA_DICTIONARY: syslog(LOG_ERR, "PID %d started this second instance of portmap (the first instance may not be running, as it launches on demand via launchd), exiting!", getppid()); exit(1); case LAUNCH_DATA_ERRNO: errno = launch_data_get_errno(resp); /* if we couldn't find the job, then portmap really isn't running via launchd and we can proceed */ if (ESRCH != errno) { syslog(LOG_ERR, "launch_msg(GETJOB...): %m"); exit(1); } break; default: syslog(LOG_ERR, "unknown response while attempting to find out if portmap is registered with launchd"); exit(1); } launch_data_free(resp); } while ((c = getopt(argc, argv, "dvh:")) != -1) { switch (c) { case 'd': debugging = 1; break; case 'v': verboselog = 1; break; case 'h': ++nhosts; hosts = realloc(hosts, nhosts * sizeof(char *)); hosts[nhosts - 1] = optarg; break; default: usage(); } } closelog(); if (!debugging && !use_launchd && daemon(0, 0)) err(1, "fork"); openlog(getprogname(), debugging ? LOG_PID | LOG_PERROR : LOG_PID, LOG_DAEMON); if (use_launchd) { msg = launch_data_alloc(LAUNCH_DATA_STRING); launch_data_set_string(msg, LAUNCH_KEY_CHECKIN); resp = launch_msg(msg); if (resp == NULL) { syslog(LOG_ERR, "launch_msg(): %m"); exit(1); } launch_data_free(msg); if (launch_data_get_type(resp) == LAUNCH_DATA_DICTIONARY) { msg = launch_data_dict_lookup(resp, LAUNCH_JOBKEY_SOCKETS); msg = launch_data_dict_lookup(msg, "OnDemandTickler"); msg = launch_data_array_get_index(msg, 0); l_on_d_fd = launch_data_get_fd(msg); } else if (launch_data_get_type(resp) == LAUNCH_DATA_STRING) { syslog(LOG_ERR, "launch_msg(): %s", launch_data_get_string(resp)); exit(1); } else if (launch_data_get_type(resp) == LAUNCH_DATA_ERRNO) { syslog(LOG_ERR, "launch_msg(): resp == %s", strerror(launch_data_get_errno(resp))); exit(1); } else { syslog(LOG_ERR, "unknown response to launch_msg()"); } launch_data_free(resp); } bzero(&addr, sizeof(addr)); addr.sin_family = AF_INET; addr.sin_port = htons(PMAPPORT); /* * If no hosts were specified, just bind to INADDR_ANY. Otherwise * make sure 127.0.0.1 is added to the list. */ ++nhosts; hosts = realloc(hosts, nhosts * sizeof(char *)); if (nhosts == 1) hosts[0] = "0.0.0.0"; else hosts[nhosts - 1] = "127.0.0.1"; /* * Add UDP socket(s) - bind to specific IPs if asked to */ while (nhosts > 0) { --nhosts; if (inet_aton(hosts[nhosts], &addr.sin_addr) < 0) { syslog(LOG_ERR, "bad IP address: %s", hosts[nhosts]); exit(1); } if ((sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { syslog(LOG_ERR, "cannot create udp socket: %m"); exit(1); } if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&sock_opt, sizeof(sock_opt)) == -1) { syslog(LOG_ERR, "setsockopt(SO_REUSEADDR): %m"); exit(1); } if (bind(sock, (struct sockaddr *)&addr, len) != 0) { syslog(LOG_ERR, "cannot bind udp: %m"); exit(1); } if ((xprt = svcudp_create(sock)) == (SVCXPRT *)NULL) { syslog(LOG_ERR, "couldn't do udp_create"); exit(1); } } free(hosts); /* make an entry for ourself */ pml = (struct pmaplist *)malloc((u_int)sizeof(struct pmaprlist)); pml->pml_next = 0; pml->pml_map.pm_prog = PMAPPROG; pml->pml_map.pm_vers = PMAPVERS; pml->pml_map.pm_prot = IPPROTO_UDP; pml->pml_map.pm_port = PMAPPORT; (struct pmaplist *)pmaplist = pml; /* * Add TCP socket */ addr.sin_addr.s_addr = 0; if ((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) { syslog(LOG_ERR, "cannot create tcp socket: %m"); exit(1); } if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&sock_opt, sizeof(sock_opt)) == -1) { syslog(LOG_ERR, "setsockopt(SO_REUSEADDR): %m"); exit(1); } if (bind(sock, (struct sockaddr *)&addr, len) != 0) { syslog(LOG_ERR, "cannot bind tcp: %m"); exit(1); } if ((xprt = svctcp_create(sock, RPCSMALLMSGSIZE, RPCSMALLMSGSIZE)) == (SVCXPRT *)NULL) { syslog(LOG_ERR, "couldn't do tcp_create"); exit(1); } /* make an entry for ourself */ pml = (struct pmaplist *)malloc((u_int)sizeof(struct pmaprlist)); pml->pml_map.pm_prog = PMAPPROG; pml->pml_map.pm_vers = PMAPVERS; pml->pml_map.pm_prot = IPPROTO_TCP; pml->pml_map.pm_port = PMAPPORT; pml->pml_next = (struct pmaplist *)pmaplist; #ifdef USE_RENDEZVOUS ((struct pmaprlist *)pml)->mdnsref = DNSServiceRegistrationCreate("", "_portmapper._tcp", "", PMAPPORT, "", mdns_callback, NULL); #endif (struct pmaplist *)pmaplist = pml; (void)svc_register(xprt, PMAPPROG, PMAPVERS, reg_service, FALSE); /* additional initializations */ check_startup(); signal(SIGCHLD, SIG_IGN); for (;;) { struct timeval timeout = { 30, 0 }; int r, maxfd; readfds = svc_fdset; if (l_on_d_fd != -1) { maxfd = (svc_maxfd > l_on_d_fd ? svc_maxfd : l_on_d_fd) + 1; FD_SET(l_on_d_fd, &readfds); } else { maxfd = svc_maxfd; } r = select(maxfd, &readfds, NULL, NULL, should_timeout() ? &timeout : NULL); if (r == -1) { if (errno == EINTR) continue; syslog(LOG_ERR, "cannot bind tcp: %m"); abort(); } else if (r > 0) { if (l_on_d_fd != -1 && FD_ISSET(l_on_d_fd, &readfds)) { struct sockaddr_un sun; socklen_t sl = sizeof(sun); char b = '\0'; int j = accept(l_on_d_fd, (struct sockaddr *)&sun, &sl); if (j == -1) { syslog(LOG_WARNING, "accept(): %m"); } else { write(j, &b, sizeof(b)); close(j); } FD_CLR(l_on_d_fd, &readfds); } svc_getreqset(&readfds); } else { exit(EXIT_SUCCESS); } } } static void usage() { fprintf(stderr, "usage: portmap [-dv]\n"); exit(1); } #ifndef lint /* need to override perror calls in rpc library */ void perror(what) const char *what; { syslog(LOG_ERR, "%s: %m", what); } #endif static struct pmaplist * find_service(prog, vers, prot) u_long prog, vers, prot; { struct pmaplist *hit = NULL; struct pmaprlist *pml; for (pml = pmaplist; pml != NULL; (struct pmaplist *)pml = pml->pl.pml_next) { if ((pml->pl.pml_map.pm_prog != prog) || (pml->pl.pml_map.pm_prot != prot)) continue; hit = (struct pmaplist *)pml; if (pml->pl.pml_map.pm_vers == vers) break; } return (hit); } static bool should_timeout(void) { bool r = true; struct pmaprlist *pml; if (!use_launchd) return false; for (pml = pmaplist; pml != NULL; (struct pmaplist *)pml = pml->pl.pml_next) { if (pml->pl.pml_map.pm_prog != PMAPPROG) { r = false; break; } } return r; } /* * 1 OK, 0 not */ static void reg_service(rqstp, xprt) struct svc_req *rqstp; SVCXPRT *xprt; { struct pmap reg; struct pmaplist *pml, *prevpml, *fnd; int ans, port; caddr_t t; /* * Later wrappers change the logging severity on the fly. Reset to * defaults before handling the next request. */ allow_severity = LOG_INFO; deny_severity = LOG_WARNING; if (debugging) (void) fprintf(stderr, "server: about to do a switch\n"); switch (rqstp->rq_proc) { case PMAPPROC_NULL: /* * Null proc call */ /* remote host authorization check */ check_default(svc_getcaller(xprt), rqstp->rq_proc, (u_long) 0); if (!svc_sendreply(xprt, xdr_void, (caddr_t)0) && debugging) { abort(); } break; case PMAPPROC_SET: /* * Set a program,version to port mapping */ if (!svc_getargs(xprt, xdr_pmap, (caddr_t)®)) svcerr_decode(xprt); else { /* reject non-local requests, protect priv. ports */ if (!check_setunset(svc_getcaller(xprt), rqstp->rq_proc, reg.pm_prog, reg.pm_port)) { ans = 0; goto done; } /* * check to see if already used * find_service returns a hit even if * the versions don't match, so check for it */ fnd = find_service(reg.pm_prog, reg.pm_vers, reg.pm_prot); if (fnd && fnd->pml_map.pm_vers == reg.pm_vers) { if (fnd->pml_map.pm_port == reg.pm_port) { ans = 1; goto done; } else { ans = 0; goto done; } } else { struct rpcent *rent; struct protoent *pent; /* * add to END of list */ pml = (struct pmaplist *) malloc((u_int)sizeof(struct pmaprlist)); pml->pml_map = reg; pml->pml_next = 0; rent = getrpcbynumber(reg.pm_prog); pent = getprotobynumber(reg.pm_prot); #ifdef USE_RENDEZVOUS if( rent != NULL && pent != NULL ) { char *snam; asprintf(&snam, "_%s._%s", rent->r_name, pent->p_name); ((struct pmaprlist *)pml)->mdnsref = DNSServiceRegistrationCreate("", snam, "", reg.pm_port, "", mdns_callback, NULL); } #endif if (pmaplist == 0) { (struct pmaplist *)pmaplist = pml; } else { for (fnd= (struct pmaplist *)pmaplist; fnd->pml_next != 0; fnd = fnd->pml_next); fnd->pml_next = pml; } ans = 1; } done: if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) && debugging) { (void) fprintf(stderr, "svc_sendreply\n"); abort(); } } break; case PMAPPROC_UNSET: /* * Remove a program,version to port mapping. */ if (!svc_getargs(xprt, xdr_pmap, (caddr_t)®)) svcerr_decode(xprt); else { ans = 0; /* reject non-local requests */ if (!check_setunset(svc_getcaller(xprt), rqstp->rq_proc, reg.pm_prog, (u_long) 0)) goto done; for (prevpml = NULL, pml = (struct pmaplist *)pmaplist; pml != NULL; ) { if ((pml->pml_map.pm_prog != reg.pm_prog) || (pml->pml_map.pm_vers != reg.pm_vers)) { /* both pml & prevpml move forwards */ prevpml = pml; pml = pml->pml_next; continue; } /* found it; pml moves forward, prevpml stays */ /* privileged port check */ if (!check_privileged_port(svc_getcaller(xprt), rqstp->rq_proc, reg.pm_prog, pml->pml_map.pm_port)) { ans = 0; break; } ans = 1; t = (caddr_t)pml; #ifdef USE_RENDEZVOUS if (((struct pmaprlist *)pml)->mdnsref) { DNSServiceDiscoveryDeallocate(((struct pmaprlist *)pml)->mdnsref); ((struct pmaprlist *)pml)->mdnsref = 0; } #endif pml = pml->pml_next; if (prevpml == NULL) (struct pmaplist *)pmaplist = pml; else prevpml->pml_next = pml; free(t); } if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&ans)) && debugging) { (void) fprintf(stderr, "svc_sendreply\n"); abort(); } } break; case PMAPPROC_GETPORT: /* * Lookup the mapping for a program,version and return its port */ if (!svc_getargs(xprt, xdr_pmap, (caddr_t)®)) svcerr_decode(xprt); else { /* remote host authorization check */ if (!check_default(svc_getcaller(xprt), rqstp->rq_proc, reg.pm_prog)) { ans = 0; goto done; } fnd = find_service(reg.pm_prog, reg.pm_vers, reg.pm_prot); if (fnd) port = fnd->pml_map.pm_port; else port = 0; if ((!svc_sendreply(xprt, xdr_long, (caddr_t)&port)) && debugging) { (void) fprintf(stderr, "svc_sendreply\n"); abort(); } } break; case PMAPPROC_DUMP: /* * Return the current set of mapped program,version */ if (!svc_getargs(xprt, xdr_void, NULL)) svcerr_decode(xprt); else { /* remote host authorization check */ struct pmaplist *p; if (!check_default(svc_getcaller(xprt), rqstp->rq_proc, (u_long) 0)) { p = 0; /* send empty list */ } else { p = (struct pmaplist *)pmaplist; } if ((!svc_sendreply(xprt, xdr_pmaplist, (caddr_t)&p)) && debugging) { (void) fprintf(stderr, "svc_sendreply\n"); abort(); } } break; case PMAPPROC_CALLIT: /* * Calls a procedure on the local machine. If the requested * procedure is not registered this procedure does not return * error information!! * This procedure is only supported on rpc/udp and calls via * rpc/udp. It passes null authentication parameters. */ callit(rqstp, xprt); break; default: /* remote host authorization check */ check_default(svc_getcaller(xprt), rqstp->rq_proc, (u_long) 0); svcerr_noproc(xprt); break; } } /* * Stuff for the rmtcall service */ #define ARGSIZE 9000 struct encap_parms { u_int arglen; char *args; }; static bool_t xdr_encap_parms(xdrs, epp) XDR *xdrs; struct encap_parms *epp; { return (xdr_bytes(xdrs, &(epp->args), &(epp->arglen), ARGSIZE)); } struct rmtcallargs { u_long rmt_prog; u_long rmt_vers; u_long rmt_port; u_long rmt_proc; struct encap_parms rmt_args; }; static bool_t xdr_rmtcall_args(xdrs, cap) XDR *xdrs; struct rmtcallargs *cap; { /* does not get a port number */ if (xdr_u_long(xdrs, &(cap->rmt_prog)) && xdr_u_long(xdrs, &(cap->rmt_vers)) && xdr_u_long(xdrs, &(cap->rmt_proc))) { return (xdr_encap_parms(xdrs, &(cap->rmt_args))); } return (FALSE); } static bool_t xdr_rmtcall_result(xdrs, cap) XDR *xdrs; struct rmtcallargs *cap; { if (xdr_u_long(xdrs, &(cap->rmt_port))) return (xdr_encap_parms(xdrs, &(cap->rmt_args))); return (FALSE); } /* * only worries about the struct encap_parms part of struct rmtcallargs. * The arglen must already be set!! */ static bool_t xdr_opaque_parms(xdrs, cap) XDR *xdrs; struct rmtcallargs *cap; { return (xdr_opaque(xdrs, cap->rmt_args.args, cap->rmt_args.arglen)); } /* * This routine finds and sets the length of incoming opaque paraters * and then calls xdr_opaque_parms. */ static bool_t xdr_len_opaque_parms(xdrs, cap) XDR *xdrs; struct rmtcallargs *cap; { register u_int beginpos, lowpos, highpos, currpos, pos; beginpos = lowpos = pos = xdr_getpos(xdrs); highpos = lowpos + ARGSIZE; while ((int)(highpos - lowpos) >= 0) { currpos = (lowpos + highpos) / 2; if (xdr_setpos(xdrs, currpos)) { pos = currpos; lowpos = currpos + 1; } else { highpos = currpos - 1; } } xdr_setpos(xdrs, beginpos); cap->rmt_args.arglen = pos - beginpos; return (xdr_opaque_parms(xdrs, cap)); } /* * Call a remote procedure service * This procedure is very quiet when things go wrong. * The proc is written to support broadcast rpc. In the broadcast case, * a machine should shut-up instead of complain, less the requestor be * overrun with complaints at the expense of not hearing a valid reply ... * * This now forks so that the program & process that it calls can call * back to the portmapper. */ static void callit(rqstp, xprt) struct svc_req *rqstp; SVCXPRT *xprt; { struct rmtcallargs a; struct pmaplist *pml; u_short port; struct sockaddr_in me; int pid, so = -1; CLIENT *client; struct authunix_parms *au = (struct authunix_parms *)rqstp->rq_clntcred; struct timeval timeout; char buf[ARGSIZE]; timeout.tv_sec = 5; timeout.tv_usec = 0; a.rmt_args.args = buf; if (!svc_getargs(xprt, xdr_rmtcall_args, (caddr_t)&a)) return; /* host and service access control */ if (!check_callit(svc_getcaller(xprt), rqstp->rq_proc, a.rmt_prog, a.rmt_proc)) return; if ((pml = find_service(a.rmt_prog, a.rmt_vers, (u_long)IPPROTO_UDP)) == NULL) return; /* * fork a child to do the work. Parent immediately returns. * Child exits upon completion. */ if ((pid = fork()) != 0) { if (pid < 0) syslog(LOG_ERR, "CALLIT (prog %lu): fork: %m", a.rmt_prog); return; } port = pml->pml_map.pm_port; get_myaddress(&me); me.sin_port = htons(port); client = clntudp_create(&me, a.rmt_prog, a.rmt_vers, timeout, &so); if (client != (CLIENT *)NULL) { if (rqstp->rq_cred.oa_flavor == AUTH_UNIX) { client->cl_auth = authunix_create(au->aup_machname, au->aup_uid, au->aup_gid, au->aup_len, au->aup_gids); } a.rmt_port = (u_long)port; if (clnt_call(client, a.rmt_proc, xdr_opaque_parms, &a, xdr_len_opaque_parms, &a, timeout) == RPC_SUCCESS) { svc_sendreply(xprt, xdr_rmtcall_result, (caddr_t)&a); } AUTH_DESTROY(client->cl_auth); clnt_destroy(client); } (void)close(so); exit(0); }