/* $NetBSD: rpcb_clnt.c,v 1.6 2000/07/16 06:41:43 itojun Exp $ */ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 2010, Oracle America, Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * - 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. * - Neither the name of the "Oracle America, Inc." 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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. */ /* * rpcb_clnt.c * interface to rpcbind rpc service. */ #include "namespace.h" #include "reentrant.h" #include #include #include #include #include #include #include #include #ifdef PORTMAP #include /* FOR IPPROTO_TCP/UDP definitions */ #include #endif /* PORTMAP */ #include #include #include #include #include #include #include #include "un-namespace.h" #include "rpc_com.h" #include "mt_misc.h" static struct timeval tottimeout = { 60, 0 }; static const struct timeval rmttimeout = { 3, 0 }; static struct timeval rpcbrmttime = { 15, 0 }; extern bool_t xdr_wrapstring(XDR *, char **); static const char nullstring[] = "\000"; #define CACHESIZE 6 struct address_cache { char *ac_host; char *ac_netid; char *ac_uaddr; struct netbuf *ac_taddr; struct address_cache *ac_next; }; static struct address_cache *front; static int cachesize; #define CLCR_GET_RPCB_TIMEOUT 1 #define CLCR_SET_RPCB_TIMEOUT 2 extern int __rpc_lowvers; static struct address_cache *check_cache(const char *, const char *); static void delete_cache(struct netbuf *); static void add_cache(const char *, const char *, struct netbuf *, char *); static CLIENT *getclnthandle(const char *, const struct netconfig *, char **); static CLIENT *local_rpcb(void); static struct netbuf *got_entry(rpcb_entry_list_ptr, const struct netconfig *); /* * This routine adjusts the timeout used for calls to the remote rpcbind. * Also, this routine can be used to set the use of portmapper version 2 * only when doing rpc_broadcasts * These are private routines that may not be provided in future releases. */ bool_t __rpc_control(int request, void *info) { switch (request) { case CLCR_GET_RPCB_TIMEOUT: *(struct timeval *)info = tottimeout; break; case CLCR_SET_RPCB_TIMEOUT: tottimeout = *(struct timeval *)info; break; case CLCR_SET_LOWVERS: __rpc_lowvers = *(int *)info; break; case CLCR_GET_LOWVERS: *(int *)info = __rpc_lowvers; break; default: return (FALSE); } return (TRUE); } /* * It might seem that a reader/writer lock would be more reasonable here. * However because getclnthandle(), the only user of the cache functions, * may do a delete_cache() operation if a check_cache() fails to return an * address useful to clnt_tli_create(), we may as well use a mutex. */ /* * As it turns out, if the cache lock is *not* a reader/writer lock, we will * block all clnt_create's if we are trying to connect to a host that's down, * since the lock will be held all during that time. */ /* * The routines check_cache(), add_cache(), delete_cache() manage the * cache of rpcbind addresses for (host, netid). */ static struct address_cache * check_cache(const char *host, const char *netid) { struct address_cache *cptr; /* READ LOCK HELD ON ENTRY: rpcbaddr_cache_lock */ for (cptr = front; cptr != NULL; cptr = cptr->ac_next) { if (!strcmp(cptr->ac_host, host) && !strcmp(cptr->ac_netid, netid)) { #ifdef ND_DEBUG fprintf(stderr, "Found cache entry for %s: %s\n", host, netid); #endif return (cptr); } } return ((struct address_cache *) NULL); } static void delete_cache(struct netbuf *addr) { struct address_cache *cptr, *prevptr = NULL; /* WRITE LOCK HELD ON ENTRY: rpcbaddr_cache_lock */ for (cptr = front; cptr != NULL; cptr = cptr->ac_next) { if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) { free(cptr->ac_host); free(cptr->ac_netid); free(cptr->ac_taddr->buf); free(cptr->ac_taddr); free(cptr->ac_uaddr); if (prevptr) prevptr->ac_next = cptr->ac_next; else front = cptr->ac_next; free(cptr); cachesize--; break; } prevptr = cptr; } } static void add_cache(const char *host, const char *netid, struct netbuf *taddr, char *uaddr) { struct address_cache *ad_cache, *cptr, *prevptr; ad_cache = (struct address_cache *) malloc(sizeof (struct address_cache)); if (!ad_cache) { return; } ad_cache->ac_host = strdup(host); ad_cache->ac_netid = strdup(netid); ad_cache->ac_uaddr = uaddr ? strdup(uaddr) : NULL; ad_cache->ac_taddr = (struct netbuf *)malloc(sizeof (struct netbuf)); if (!ad_cache->ac_host || !ad_cache->ac_netid || !ad_cache->ac_taddr || (uaddr && !ad_cache->ac_uaddr)) { goto out; } ad_cache->ac_taddr->len = ad_cache->ac_taddr->maxlen = taddr->len; ad_cache->ac_taddr->buf = (char *) malloc(taddr->len); if (ad_cache->ac_taddr->buf == NULL) { out: free(ad_cache->ac_host); free(ad_cache->ac_netid); free(ad_cache->ac_uaddr); free(ad_cache->ac_taddr); free(ad_cache); return; } memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len); #ifdef ND_DEBUG fprintf(stderr, "Added to cache: %s : %s\n", host, netid); #endif /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: cptr */ rwlock_wrlock(&rpcbaddr_cache_lock); if (cachesize < CACHESIZE) { ad_cache->ac_next = front; front = ad_cache; cachesize++; } else { /* Free the last entry */ cptr = front; prevptr = NULL; while (cptr->ac_next) { prevptr = cptr; cptr = cptr->ac_next; } #ifdef ND_DEBUG fprintf(stderr, "Deleted from cache: %s : %s\n", cptr->ac_host, cptr->ac_netid); #endif free(cptr->ac_host); free(cptr->ac_netid); free(cptr->ac_taddr->buf); free(cptr->ac_taddr); free(cptr->ac_uaddr); if (prevptr) { prevptr->ac_next = NULL; ad_cache->ac_next = front; front = ad_cache; } else { front = ad_cache; ad_cache->ac_next = NULL; } free(cptr); } rwlock_unlock(&rpcbaddr_cache_lock); } /* * This routine will return a client handle that is connected to the * rpcbind. If targaddr is non-NULL, the "universal address" of the * host will be stored in *targaddr; the caller is responsible for * freeing this string. * On error, returns NULL and free's everything. */ static CLIENT * getclnthandle(const char *host, const struct netconfig *nconf, char **targaddr) { CLIENT *client; struct netbuf *addr, taddr; struct netbuf addr_to_delete; struct __rpc_sockinfo si; struct addrinfo hints, *res, *tres; struct address_cache *ad_cache; char *tmpaddr; /* VARIABLES PROTECTED BY rpcbaddr_cache_lock: ad_cache */ /* Get the address of the rpcbind. Check cache first */ client = NULL; addr_to_delete.len = 0; rwlock_rdlock(&rpcbaddr_cache_lock); ad_cache = NULL; if (host != NULL) ad_cache = check_cache(host, nconf->nc_netid); if (ad_cache != NULL) { addr = ad_cache->ac_taddr; client = clnt_tli_create(RPC_ANYFD, nconf, addr, (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); if (client != NULL) { if (targaddr) *targaddr = strdup(ad_cache->ac_uaddr); rwlock_unlock(&rpcbaddr_cache_lock); return (client); } addr_to_delete.len = addr->len; addr_to_delete.buf = (char *)malloc(addr->len); if (addr_to_delete.buf == NULL) { addr_to_delete.len = 0; } else { memcpy(addr_to_delete.buf, addr->buf, addr->len); } } rwlock_unlock(&rpcbaddr_cache_lock); if (addr_to_delete.len != 0) { /* * Assume this may be due to cache data being * outdated */ rwlock_wrlock(&rpcbaddr_cache_lock); delete_cache(&addr_to_delete); rwlock_unlock(&rpcbaddr_cache_lock); free(addr_to_delete.buf); } if (!__rpc_nconf2sockinfo(nconf, &si)) { rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; return NULL; } memset(&hints, 0, sizeof hints); hints.ai_family = si.si_af; hints.ai_socktype = si.si_socktype; hints.ai_protocol = si.si_proto; #ifdef CLNT_DEBUG printf("trying netid %s family %d proto %d socktype %d\n", nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype); #endif if (nconf->nc_protofmly != NULL && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) { client = local_rpcb(); if (! client) { #ifdef ND_DEBUG clnt_pcreateerror("rpcbind clnt interface"); #endif return (NULL); } else { struct sockaddr_un sun; if (targaddr) { *targaddr = malloc(sizeof(sun.sun_path)); if (*targaddr == NULL) { CLNT_DESTROY(client); return (NULL); } strncpy(*targaddr, _PATH_RPCBINDSOCK, sizeof(sun.sun_path)); } return (client); } } else { if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) { rpc_createerr.cf_stat = RPC_UNKNOWNHOST; return NULL; } } for (tres = res; tres != NULL; tres = tres->ai_next) { taddr.buf = tres->ai_addr; taddr.len = taddr.maxlen = tres->ai_addrlen; #ifdef ND_DEBUG { char *ua; ua = taddr2uaddr(nconf, &taddr); fprintf(stderr, "Got it [%s]\n", ua); free(ua); } #endif #ifdef ND_DEBUG { int i; fprintf(stderr, "\tnetbuf len = %d, maxlen = %d\n", taddr.len, taddr.maxlen); fprintf(stderr, "\tAddress is "); for (i = 0; i < taddr.len; i++) fprintf(stderr, "%u.", ((char *)(taddr.buf))[i]); fprintf(stderr, "\n"); } #endif client = clnt_tli_create(RPC_ANYFD, nconf, &taddr, (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0); #ifdef ND_DEBUG if (! client) { clnt_pcreateerror("rpcbind clnt interface"); } #endif if (client) { tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL; add_cache(host, nconf->nc_netid, &taddr, tmpaddr); if (targaddr) *targaddr = tmpaddr; break; } } if (res) freeaddrinfo(res); return (client); } /* XXX */ #define IN4_LOCALHOST_STRING "127.0.0.1" #define IN6_LOCALHOST_STRING "::1" /* * This routine will return a client handle that is connected to the local * rpcbind. Returns NULL on error and free's everything. */ static CLIENT * local_rpcb(void) { CLIENT *client; static struct netconfig *loopnconf; static char *hostname; int sock; size_t tsize; struct netbuf nbuf; struct sockaddr_un sun; /* * Try connecting to the local rpcbind through a local socket * first. If this doesn't work, try all transports defined in * the netconfig file. */ memset(&sun, 0, sizeof sun); sock = _socket(AF_LOCAL, SOCK_STREAM, 0); if (sock < 0) goto try_nconf; sun.sun_family = AF_LOCAL; strcpy(sun.sun_path, _PATH_RPCBINDSOCK); nbuf.len = sun.sun_len = SUN_LEN(&sun); nbuf.maxlen = sizeof (struct sockaddr_un); nbuf.buf = &sun; tsize = __rpc_get_t_size(AF_LOCAL, 0, 0); client = clnt_vc_create(sock, &nbuf, (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS, tsize, tsize); if (client != NULL) { /* Mark the socket to be closed in destructor */ (void) CLNT_CONTROL(client, CLSET_FD_CLOSE, NULL); return client; } /* Nobody needs this socket anymore; free the descriptor. */ _close(sock); try_nconf: /* VARIABLES PROTECTED BY loopnconf_lock: loopnconf */ mutex_lock(&loopnconf_lock); if (loopnconf == NULL) { struct netconfig *nconf, *tmpnconf = NULL; void *nc_handle; int fd; nc_handle = setnetconfig(); if (nc_handle == NULL) { /* fails to open netconfig file */ syslog (LOG_ERR, "rpc: failed to open " NETCONFIG); rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; mutex_unlock(&loopnconf_lock); return (NULL); } while ((nconf = getnetconfig(nc_handle)) != NULL) { #ifdef INET6 if ((strcmp(nconf->nc_protofmly, NC_INET6) == 0 || #else if (( #endif strcmp(nconf->nc_protofmly, NC_INET) == 0) && (nconf->nc_semantics == NC_TPI_COTS || nconf->nc_semantics == NC_TPI_COTS_ORD)) { fd = __rpc_nconf2fd(nconf); /* * Can't create a socket, assume that * this family isn't configured in the kernel. */ if (fd < 0) continue; _close(fd); tmpnconf = nconf; if (!strcmp(nconf->nc_protofmly, NC_INET)) hostname = IN4_LOCALHOST_STRING; else hostname = IN6_LOCALHOST_STRING; } } if (tmpnconf == NULL) { endnetconfig(nc_handle); rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; mutex_unlock(&loopnconf_lock); return (NULL); } loopnconf = getnetconfigent(tmpnconf->nc_netid); /* loopnconf is never freed */ endnetconfig(nc_handle); } mutex_unlock(&loopnconf_lock); client = getclnthandle(hostname, loopnconf, NULL); return (client); } /* * Set a mapping between program, version and address. * Calls the rpcbind service to do the mapping. * * nconf - Network structure of transport * address - Services netconfig address */ bool_t rpcb_set(rpcprog_t program, rpcvers_t version, const struct netconfig *nconf, const struct netbuf *address) { CLIENT *client; bool_t rslt = FALSE; RPCB parms; char uidbuf[32]; /* parameter checking */ if (nconf == NULL) { rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; return (FALSE); } if (address == NULL) { rpc_createerr.cf_stat = RPC_UNKNOWNADDR; return (FALSE); } client = local_rpcb(); if (! client) { return (FALSE); } /* convert to universal */ /*LINTED const castaway*/ parms.r_addr = taddr2uaddr((struct netconfig *) nconf, (struct netbuf *)address); if (!parms.r_addr) { CLNT_DESTROY(client); rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; return (FALSE); /* no universal address */ } parms.r_prog = program; parms.r_vers = version; parms.r_netid = nconf->nc_netid; /* * Though uid is not being used directly, we still send it for * completeness. For non-unix platforms, perhaps some other * string or an empty string can be sent. */ (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); parms.r_owner = uidbuf; CLNT_CALL(client, (rpcproc_t)RPCBPROC_SET, (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, (xdrproc_t) xdr_bool, (char *)(void *)&rslt, tottimeout); CLNT_DESTROY(client); free(parms.r_addr); return (rslt); } /* * Remove the mapping between program, version and netbuf address. * Calls the rpcbind service to do the un-mapping. * If netbuf is NULL, unset for all the transports, otherwise unset * only for the given transport. */ bool_t rpcb_unset(rpcprog_t program, rpcvers_t version, const struct netconfig *nconf) { CLIENT *client; bool_t rslt = FALSE; RPCB parms; char uidbuf[32]; client = local_rpcb(); if (! client) { return (FALSE); } parms.r_prog = program; parms.r_vers = version; if (nconf) parms.r_netid = nconf->nc_netid; else { /*LINTED const castaway*/ parms.r_netid = (char *) &nullstring[0]; /* unsets all */ } /*LINTED const castaway*/ parms.r_addr = (char *) &nullstring[0]; (void) snprintf(uidbuf, sizeof uidbuf, "%d", geteuid()); parms.r_owner = uidbuf; CLNT_CALL(client, (rpcproc_t)RPCBPROC_UNSET, (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, (xdrproc_t) xdr_bool, (char *)(void *)&rslt, tottimeout); CLNT_DESTROY(client); return (rslt); } /* * From the merged list, find the appropriate entry */ static struct netbuf * got_entry(rpcb_entry_list_ptr relp, const struct netconfig *nconf) { struct netbuf *na = NULL; rpcb_entry_list_ptr sp; rpcb_entry *rmap; for (sp = relp; sp != NULL; sp = sp->rpcb_entry_next) { rmap = &sp->rpcb_entry_map; if ((strcmp(nconf->nc_proto, rmap->r_nc_proto) == 0) && (strcmp(nconf->nc_protofmly, rmap->r_nc_protofmly) == 0) && (nconf->nc_semantics == rmap->r_nc_semantics) && (rmap->r_maddr != NULL) && (rmap->r_maddr[0] != 0)) { na = uaddr2taddr(nconf, rmap->r_maddr); #ifdef ND_DEBUG fprintf(stderr, "\tRemote address is [%s].\n", rmap->r_maddr); if (!na) fprintf(stderr, "\tCouldn't resolve remote address!\n"); #endif break; } } return (na); } /* * Quick check to see if rpcbind is up. Tries to connect over * local transport. */ static bool_t __rpcbind_is_up(void) { struct netconfig *nconf; struct sockaddr_un sun; void *localhandle; int sock; nconf = NULL; localhandle = setnetconfig(); while ((nconf = getnetconfig(localhandle)) != NULL) { if (nconf->nc_protofmly != NULL && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) break; } endnetconfig(localhandle); if (nconf == NULL) return (FALSE); memset(&sun, 0, sizeof sun); sock = _socket(AF_LOCAL, SOCK_STREAM, 0); if (sock < 0) return (FALSE); sun.sun_family = AF_LOCAL; strncpy(sun.sun_path, _PATH_RPCBINDSOCK, sizeof(sun.sun_path)); sun.sun_len = SUN_LEN(&sun); if (_connect(sock, (struct sockaddr *)&sun, sun.sun_len) < 0) { _close(sock); return (FALSE); } _close(sock); return (TRUE); } /* * An internal function which optimizes rpcb_getaddr function. It also * returns the client handle that it uses to contact the remote rpcbind. * * The algorithm used: If the transports is TCP or UDP, it first tries * version 2 (portmap), 4 and then 3 (svr4). This order should be * changed in the next OS release to 4, 2 and 3. We are assuming that by * that time, version 4 would be available on many machines on the network. * With this algorithm, we get performance as well as a plan for * obsoleting version 2. * * For all other transports, the algorithm remains as 4 and then 3. * * XXX: Due to some problems with t_connect(), we do not reuse the same client * handle for COTS cases and hence in these cases we do not return the * client handle. This code will change if t_connect() ever * starts working properly. Also look under clnt_vc.c. */ struct netbuf * __rpcb_findaddr_timed(rpcprog_t program, rpcvers_t version, const struct netconfig *nconf, const char *host, CLIENT **clpp, struct timeval *tp) { static bool_t check_rpcbind = TRUE; CLIENT *client = NULL; RPCB parms; enum clnt_stat clnt_st; char *ua = NULL; rpcvers_t vers; struct netbuf *address = NULL; rpcvers_t start_vers = RPCBVERS4; struct netbuf servaddr; /* parameter checking */ if (nconf == NULL) { rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; return (NULL); } parms.r_addr = NULL; /* * Use default total timeout if no timeout is specified. */ if (tp == NULL) tp = &tottimeout; #ifdef PORTMAP /* Try version 2 for TCP or UDP */ if (strcmp(nconf->nc_protofmly, NC_INET) == 0) { u_short port = 0; struct netbuf remote; rpcvers_t pmapvers = 2; struct pmap pmapparms; /* * The comment below is now very old, having * been committed to FreeBSD during an import * from NetBSD in 2001. I do not believe there * will still be any rpcbind servers that do * UDP only and, since Azure requires use of * TCP for NFSv3 mounts, comment this out * so that NFSv3 mounts on Azure can work. */ #ifdef notnow /* * Try UDP only - there are some portmappers out * there that use UDP only. */ if (strcmp(nconf->nc_proto, NC_TCP) == 0) { struct netconfig *newnconf; if ((newnconf = getnetconfigent("udp")) == NULL) { rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; return (NULL); } client = getclnthandle(host, newnconf, &parms.r_addr); freenetconfigent(newnconf); } else #endif client = getclnthandle(host, nconf, &parms.r_addr); if (client == NULL) return (NULL); /* * Set version and retry timeout. */ CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rpcbrmttime); CLNT_CONTROL(client, CLSET_VERS, (char *)&pmapvers); pmapparms.pm_prog = program; pmapparms.pm_vers = version; pmapparms.pm_prot = strcmp(nconf->nc_proto, NC_TCP) ? IPPROTO_UDP : IPPROTO_TCP; pmapparms.pm_port = 0; /* not needed */ clnt_st = CLNT_CALL(client, (rpcproc_t)PMAPPROC_GETPORT, (xdrproc_t) xdr_pmap, (caddr_t)(void *)&pmapparms, (xdrproc_t) xdr_u_short, (caddr_t)(void *)&port, *tp); if (clnt_st != RPC_SUCCESS) { if ((clnt_st == RPC_PROGVERSMISMATCH) || (clnt_st == RPC_PROGUNAVAIL)) goto try_rpcbind; /* Try different versions */ rpc_createerr.cf_stat = RPC_PMAPFAILURE; clnt_geterr(client, &rpc_createerr.cf_error); goto error; } else if (port == 0) { address = NULL; rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; goto error; } port = htons(port); CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)&remote); if (((address = (struct netbuf *) malloc(sizeof (struct netbuf))) == NULL) || ((address->buf = (char *) malloc(remote.len)) == NULL)) { rpc_createerr.cf_stat = RPC_SYSTEMERROR; clnt_geterr(client, &rpc_createerr.cf_error); free(address); address = NULL; goto error; } memcpy(address->buf, remote.buf, remote.len); memcpy(&((char *)address->buf)[sizeof (short)], (char *)(void *)&port, sizeof (short)); address->len = address->maxlen = remote.len; goto done; } #endif /* PORTMAP */ try_rpcbind: /* * Check if rpcbind is up. This prevents needless delays when * accessing applications such as the keyserver while booting * disklessly. */ if (check_rpcbind && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) { if (!__rpcbind_is_up()) { rpc_createerr.cf_stat = RPC_PMAPFAILURE; rpc_createerr.cf_error.re_errno = 0; goto error; } check_rpcbind = FALSE; } /* * Now we try version 4 and then 3. * We also send the remote system the address we used to * contact it in case it can help to connect back with us */ parms.r_prog = program; parms.r_vers = version; /*LINTED const castaway*/ parms.r_owner = (char *) &nullstring[0]; /* not needed; */ /* just for xdring */ parms.r_netid = nconf->nc_netid; /* not really needed */ /* * If a COTS transport is being used, try getting address via CLTS * transport. This works only with version 4. */ if (nconf->nc_semantics == NC_TPI_COTS_ORD || nconf->nc_semantics == NC_TPI_COTS) { void *handle; struct netconfig *nconf_clts; rpcb_entry_list_ptr relp = NULL; if (client == NULL) { /* This did not go through the above PORTMAP/TCP code */ if ((handle = __rpc_setconf("datagram_v")) != NULL) { while ((nconf_clts = __rpc_getconf(handle)) != NULL) { if (strcmp(nconf_clts->nc_protofmly, nconf->nc_protofmly) != 0) { continue; } client = getclnthandle(host, nconf_clts, &parms.r_addr); break; } __rpc_endconf(handle); } if (client == NULL) goto regular_rpcbind; /* Go the regular way */ } else { /* This is a UDP PORTMAP handle. Change to version 4 */ vers = RPCBVERS4; CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); } /* * We also send the remote system the address we used to * contact it in case it can help it connect back with us */ if (parms.r_addr == NULL) { /*LINTED const castaway*/ parms.r_addr = (char *) &nullstring[0]; /* for XDRing */ } CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rpcbrmttime); clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDRLIST, (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, (xdrproc_t) xdr_rpcb_entry_list_ptr, (char *)(void *)&relp, *tp); if (clnt_st == RPC_SUCCESS) { if ((address = got_entry(relp, nconf)) != NULL) { xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, (char *)(void *)&relp); CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)(void *)&servaddr); __rpc_fixup_addr(address, &servaddr); goto done; } /* Entry not found for this transport */ xdr_free((xdrproc_t) xdr_rpcb_entry_list_ptr, (char *)(void *)&relp); /* * XXX: should have perhaps returned with error but * since the remote machine might not always be able * to send the address on all transports, we try the * regular way with regular_rpcbind */ goto regular_rpcbind; } else if ((clnt_st == RPC_PROGVERSMISMATCH) || (clnt_st == RPC_PROGUNAVAIL)) { start_vers = RPCBVERS; /* Try version 3 now */ goto regular_rpcbind; /* Try different versions */ } else { rpc_createerr.cf_stat = RPC_PMAPFAILURE; clnt_geterr(client, &rpc_createerr.cf_error); goto error; } } regular_rpcbind: /* Now the same transport is to be used to get the address */ if (client && ((nconf->nc_semantics == NC_TPI_COTS_ORD) || (nconf->nc_semantics == NC_TPI_COTS))) { /* A CLTS type of client - destroy it */ CLNT_DESTROY(client); client = NULL; } if (client == NULL) { client = getclnthandle(host, nconf, &parms.r_addr); if (client == NULL) { goto error; } } if (parms.r_addr == NULL) { /*LINTED const castaway*/ parms.r_addr = (char *) &nullstring[0]; } /* First try from start_vers and then version 3 (RPCBVERS) */ CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *) &rpcbrmttime); for (vers = start_vers; vers >= RPCBVERS; vers--) { /* Set the version */ CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETADDR, (xdrproc_t) xdr_rpcb, (char *)(void *)&parms, (xdrproc_t) xdr_wrapstring, (char *)(void *) &ua, *tp); if (clnt_st == RPC_SUCCESS) { if ((ua == NULL) || (ua[0] == 0)) { /* address unknown */ rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED; goto error; } address = uaddr2taddr(nconf, ua); #ifdef ND_DEBUG fprintf(stderr, "\tRemote address is [%s]\n", ua); if (!address) fprintf(stderr, "\tCouldn't resolve remote address!\n"); #endif xdr_free((xdrproc_t)xdr_wrapstring, (char *)(void *)&ua); if (! address) { /* We don't know about your universal address */ rpc_createerr.cf_stat = RPC_N2AXLATEFAILURE; goto error; } CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)(void *)&servaddr); __rpc_fixup_addr(address, &servaddr); goto done; } else if (clnt_st == RPC_PROGVERSMISMATCH) { struct rpc_err rpcerr; clnt_geterr(client, &rpcerr); if (rpcerr.re_vers.low > RPCBVERS4) goto error; /* a new version, can't handle */ } else if (clnt_st != RPC_PROGUNAVAIL) { /* Cant handle this error */ rpc_createerr.cf_stat = clnt_st; clnt_geterr(client, &rpc_createerr.cf_error); goto error; } } error: if (client) { CLNT_DESTROY(client); client = NULL; } done: if (nconf->nc_semantics != NC_TPI_CLTS) { /* This client is the connectionless one */ if (client) { CLNT_DESTROY(client); client = NULL; } } if (clpp) { *clpp = client; } else if (client) { CLNT_DESTROY(client); } if (parms.r_addr != NULL && parms.r_addr != nullstring) free(parms.r_addr); return (address); } /* * Find the mapped address for program, version. * Calls the rpcbind service remotely to do the lookup. * Uses the transport specified in nconf. * Returns FALSE (0) if no map exists, else returns 1. * * Assuming that the address is all properly allocated */ bool_t rpcb_getaddr(rpcprog_t program, rpcvers_t version, const struct netconfig *nconf, struct netbuf *address, const char *host) { struct netbuf *na; if ((na = __rpcb_findaddr_timed(program, version, (struct netconfig *) nconf, (char *) host, (CLIENT **) NULL, (struct timeval *) NULL)) == NULL) return (FALSE); if (na->len > address->maxlen) { /* Too long address */ free(na->buf); free(na); rpc_createerr.cf_stat = RPC_FAILED; return (FALSE); } memcpy(address->buf, na->buf, (size_t)na->len); address->len = na->len; free(na->buf); free(na); return (TRUE); } /* * Get a copy of the current maps. * Calls the rpcbind service remotely to get the maps. * * It returns only a list of the services * It returns NULL on failure. */ rpcblist * rpcb_getmaps(const struct netconfig *nconf, const char *host) { rpcblist_ptr head = NULL; CLIENT *client; enum clnt_stat clnt_st; rpcvers_t vers = 0; client = getclnthandle(host, nconf, NULL); if (client == NULL) { return (head); } clnt_st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, (char *)(void *)&head, tottimeout); if (clnt_st == RPC_SUCCESS) goto done; if ((clnt_st != RPC_PROGVERSMISMATCH) && (clnt_st != RPC_PROGUNAVAIL)) { rpc_createerr.cf_stat = RPC_RPCBFAILURE; clnt_geterr(client, &rpc_createerr.cf_error); goto done; } /* fall back to earlier version */ CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); if (vers == RPCBVERS4) { vers = RPCBVERS; CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_DUMP, (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_rpcblist_ptr, (char *)(void *)&head, tottimeout) == RPC_SUCCESS) goto done; } rpc_createerr.cf_stat = RPC_RPCBFAILURE; clnt_geterr(client, &rpc_createerr.cf_error); done: CLNT_DESTROY(client); return (head); } /* * rpcbinder remote-call-service interface. * This routine is used to call the rpcbind remote call service * which will look up a service program in the address maps, and then * remotely call that routine with the given parameters. This allows * programs to do a lookup and call in one step. * * nconf -Netconfig structure * host - Remote host name * proc - Remote proc identifiers * xdrargs, xdrres; XDR routines * argsp, resp - Argument and Result * tout - Timeout value for this call * addr_ptr - Preallocated netbuf address */ enum clnt_stat rpcb_rmtcall(const struct netconfig *nconf, const char *host, rpcprog_t prog, rpcvers_t vers, rpcproc_t proc, xdrproc_t xdrargs, caddr_t argsp, xdrproc_t xdrres, caddr_t resp, struct timeval tout, const struct netbuf *addr_ptr) { CLIENT *client; enum clnt_stat stat; struct r_rpcb_rmtcallargs a; struct r_rpcb_rmtcallres r; rpcvers_t rpcb_vers; stat = 0; client = getclnthandle(host, nconf, NULL); if (client == NULL) { return (RPC_FAILED); } /*LINTED const castaway*/ CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)(void *)&rmttimeout); a.prog = prog; a.vers = vers; a.proc = proc; a.args.args_val = argsp; a.xdr_args = xdrargs; r.addr = NULL; r.results.results_val = resp; r.xdr_res = xdrres; for (rpcb_vers = RPCBVERS4; rpcb_vers >= RPCBVERS; rpcb_vers--) { CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&rpcb_vers); stat = CLNT_CALL(client, (rpcproc_t)RPCBPROC_CALLIT, (xdrproc_t) xdr_rpcb_rmtcallargs, (char *)(void *)&a, (xdrproc_t) xdr_rpcb_rmtcallres, (char *)(void *)&r, tout); if ((stat == RPC_SUCCESS) && (addr_ptr != NULL)) { struct netbuf *na; /*LINTED const castaway*/ na = uaddr2taddr((struct netconfig *) nconf, r.addr); if (!na) { stat = RPC_N2AXLATEFAILURE; /*LINTED const castaway*/ ((struct netbuf *) addr_ptr)->len = 0; goto error; } if (na->len > addr_ptr->maxlen) { /* Too long address */ stat = RPC_FAILED; /* XXX A better error no */ free(na->buf); free(na); /*LINTED const castaway*/ ((struct netbuf *) addr_ptr)->len = 0; goto error; } memcpy(addr_ptr->buf, na->buf, (size_t)na->len); /*LINTED const castaway*/ ((struct netbuf *)addr_ptr)->len = na->len; free(na->buf); free(na); break; } else if ((stat != RPC_PROGVERSMISMATCH) && (stat != RPC_PROGUNAVAIL)) { goto error; } } error: CLNT_DESTROY(client); if (r.addr) xdr_free((xdrproc_t) xdr_wrapstring, (char *)(void *)&r.addr); return (stat); } /* * Gets the time on the remote host. * Returns 1 if succeeds else 0. */ bool_t rpcb_gettime(const char *host, time_t *timep) { CLIENT *client = NULL; void *handle; struct netconfig *nconf; rpcvers_t vers; enum clnt_stat st; if ((host == NULL) || (host[0] == 0)) { time(timep); return (TRUE); } if ((handle = __rpc_setconf("netpath")) == NULL) { rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; return (FALSE); } rpc_createerr.cf_stat = RPC_SUCCESS; while (client == NULL) { if ((nconf = __rpc_getconf(handle)) == NULL) { if (rpc_createerr.cf_stat == RPC_SUCCESS) rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; break; } client = getclnthandle(host, nconf, NULL); if (client) break; } __rpc_endconf(handle); if (client == (CLIENT *) NULL) { return (FALSE); } st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout); if ((st == RPC_PROGVERSMISMATCH) || (st == RPC_PROGUNAVAIL)) { CLNT_CONTROL(client, CLGET_VERS, (char *)(void *)&vers); if (vers == RPCBVERS4) { /* fall back to earlier version */ vers = RPCBVERS; CLNT_CONTROL(client, CLSET_VERS, (char *)(void *)&vers); st = CLNT_CALL(client, (rpcproc_t)RPCBPROC_GETTIME, (xdrproc_t) xdr_void, NULL, (xdrproc_t) xdr_int, (char *)(void *)timep, tottimeout); } } CLNT_DESTROY(client); return (st == RPC_SUCCESS? TRUE: FALSE); } /* * Converts taddr to universal address. This routine should never * really be called because local n2a libraries are always provided. */ char * rpcb_taddr2uaddr(struct netconfig *nconf, struct netbuf *taddr) { CLIENT *client; char *uaddr = NULL; /* parameter checking */ if (nconf == NULL) { rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; return (NULL); } if (taddr == NULL) { rpc_createerr.cf_stat = RPC_UNKNOWNADDR; return (NULL); } client = local_rpcb(); if (! client) { return (NULL); } CLNT_CALL(client, (rpcproc_t)RPCBPROC_TADDR2UADDR, (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, tottimeout); CLNT_DESTROY(client); return (uaddr); } /* * Converts universal address to netbuf. This routine should never * really be called because local n2a libraries are always provided. */ struct netbuf * rpcb_uaddr2taddr(struct netconfig *nconf, char *uaddr) { CLIENT *client; struct netbuf *taddr; /* parameter checking */ if (nconf == NULL) { rpc_createerr.cf_stat = RPC_UNKNOWNPROTO; return (NULL); } if (uaddr == NULL) { rpc_createerr.cf_stat = RPC_UNKNOWNADDR; return (NULL); } client = local_rpcb(); if (! client) { return (NULL); } taddr = (struct netbuf *)calloc(1, sizeof (struct netbuf)); if (taddr == NULL) { CLNT_DESTROY(client); return (NULL); } if (CLNT_CALL(client, (rpcproc_t)RPCBPROC_UADDR2TADDR, (xdrproc_t) xdr_wrapstring, (char *)(void *)&uaddr, (xdrproc_t) xdr_netbuf, (char *)(void *)taddr, tottimeout) != RPC_SUCCESS) { free(taddr); taddr = NULL; } CLNT_DESTROY(client); return (taddr); }