path: root/src/rpcb_clnt.c

/*
 * 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 <pthread.h>
#include <reentrant.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/utsname.h>
#include <rpc/rpc.h>
#include <rpc/rpcb_prot.h>
#include <rpc/nettype.h>
#include <netconfig.h>
#ifdef PORTMAP
#include <netinet/in.h>		/* FOR IPPROTO_TCP/UDP definitions */
#include <rpc/pmap_prot.h>
#endif				/* PORTMAP */
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <syslog.h>
#include <assert.h>

#include "rpc_com.h"
#include "debug.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 RPCB_OWNER_STRING "libtirpc"

#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 *copy_of_cached(const char *, 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);
#ifdef NOTUSED
static struct netbuf *got_entry(rpcb_entry_list_ptr, const struct netconfig *);
#endif

/*
 * Destroys a cached address entry structure.
 *
 */
static void
destroy_addr(addr)
	struct address_cache *addr;
{
	if (addr == NULL)
		return;
	if (addr->ac_host != NULL) {
		free(addr->ac_host);
		addr->ac_host = NULL;
	}
	if (addr->ac_netid != NULL) {
		free(addr->ac_netid);
		addr->ac_netid = NULL;
	}
	if (addr->ac_uaddr != NULL) {
		free(addr->ac_uaddr);
		addr->ac_uaddr = NULL;
	}
	if (addr->ac_taddr != NULL) {
		if(addr->ac_taddr->buf != NULL) {
			free(addr->ac_taddr->buf);
			addr->ac_taddr->buf = NULL;
		}
		addr->ac_taddr = NULL;
	}
	free(addr);
	addr = NULL;
}

/*
 * Creates an unlinked copy of an address cache entry. If the argument is NULL
 * or the new entry cannot be allocated then NULL is returned.
 */
static struct address_cache *
copy_addr(addr)
	const struct address_cache *addr;
{
	struct address_cache *copy;

	if (addr == NULL)
		return (NULL);

	copy = calloc(1, sizeof(*addr));
	if (copy == NULL)
		return (NULL);

	if (addr->ac_host != NULL) {
		copy->ac_host = strdup(addr->ac_host);
		if (copy->ac_host == NULL)
			goto err;
	}
	if (addr->ac_netid != NULL) {
		copy->ac_netid = strdup(addr->ac_netid);
		if (copy->ac_netid == NULL)
			goto err;
	}
	if (addr->ac_uaddr != NULL) {
		copy->ac_uaddr = strdup(addr->ac_uaddr);
		if (copy->ac_uaddr == NULL)
			goto err;
	}

	if (addr->ac_taddr == NULL)
		return (copy);

	copy->ac_taddr = calloc(1, sizeof(*addr->ac_taddr));
	if (copy->ac_taddr == NULL)
		goto err;

	memcpy(copy->ac_taddr, addr->ac_taddr, sizeof(*addr->ac_taddr));
	copy->ac_taddr->buf = malloc(addr->ac_taddr->len);
	if (copy->ac_taddr->buf == NULL)
		goto err;

	memcpy(copy->ac_taddr->buf, addr->ac_taddr->buf, addr->ac_taddr->len);
	return (copy);

err:
	destroy_addr(copy);
	return (NULL);
}

/*
 * 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(request, info)
	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);
}

/*
 * Protect against concurrent access to the address cache and modifications
 * (esp. deletions) of cache entries.
 *
 * Previously a bidirectional R/W lock was used. However, R/W locking is
 * dangerous as it allows concurrent modification (e.g. deletion with write
 * lock) at the same time as the deleted element is accessed via check_cache()
 * and a read lock). We absolutely need a single mutex for all access to
 * prevent cache corruption. If the mutexing is restricted to only the
 * relevant code sections, deadlocking should be avoided even with recursed
 * client creation.
 */
extern pthread_mutex_t	rpcbaddr_cache_lock;

/*
 * The routines check_cache(), add_cache(), delete_cache() manage the
 * cache of rpcbind addresses for (host, netid).
 */

static struct address_cache *
copy_of_cached(host, netid)
	const char *host; 
	char *netid;
{
	struct address_cache *cptr, *copy = NULL;

	mutex_lock(&rpcbaddr_cache_lock);
	for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
		if (!strcmp(cptr->ac_host, host) &&
		    !strcmp(cptr->ac_netid, netid)) {
			LIBTIRPC_DEBUG(3, ("check_cache: Found cache entry for %s: %s\n", 
				host, netid));
			copy = copy_addr(cptr);
			break;
		}
	}
	mutex_unlock(&rpcbaddr_cache_lock);
	return copy;
}

static void
delete_cache(addr)
	struct netbuf *addr;
{
	struct address_cache *cptr = NULL, *prevptr = NULL;

	/* LOCK HELD ON ENTRY: rpcbaddr_cache_lock */
	mutex_lock(&rpcbaddr_cache_lock);

	for (cptr = front; cptr != NULL; cptr = cptr->ac_next) {
		if (!memcmp(cptr->ac_taddr->buf, addr->buf, addr->len)) {
			/* Unlink from cache. We'll destroy it after releasing the mutex. */
			if (cptr->ac_uaddr) {
				free(cptr->ac_uaddr);
				cptr->ac_uaddr = NULL;
			}
			if (prevptr) {
				prevptr->ac_next = cptr->ac_next;
			} else {
				front = cptr->ac_next;
			}
			cachesize--;
			break;
		}
		prevptr = cptr;
	}

	mutex_unlock(&rpcbaddr_cache_lock);
	destroy_addr(cptr);
}

static void
add_cache(host, netid, taddr, uaddr)
	const char *host, *netid;
	char *uaddr;
	struct netbuf *taddr;
{
	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_free;
	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)
		goto out_free;
	memcpy(ad_cache->ac_taddr->buf, taddr->buf, taddr->len);
	LIBTIRPC_DEBUG(3, ("add_cache: Added to cache: %s : %s\n", host, netid));

/* VARIABLES PROTECTED BY rpcbaddr_cache_lock:  cptr */

	mutex_lock(&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;
		}

		LIBTIRPC_DEBUG(3, ("add_cache: Deleted from cache: %s : %s\n",
			cptr->ac_host, cptr->ac_netid));
		free(cptr->ac_host);
		free(cptr->ac_netid);
		free(cptr->ac_taddr->buf);
		free(cptr->ac_taddr);
		if (cptr->ac_uaddr)
			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);
	}
	mutex_unlock(&rpcbaddr_cache_lock);
	return;

out_free:
	free(ad_cache->ac_host);
	free(ad_cache->ac_netid);
	free(ad_cache->ac_uaddr);
	free(ad_cache->ac_taddr);
	free(ad_cache);
}


/*
 * 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(host, nconf, targaddr)
	const char *host;
	const struct netconfig *nconf;
	char **targaddr;
{
	CLIENT *client;
	struct netbuf taddr;
	struct __rpc_sockinfo si;
	struct addrinfo hints, *res, *tres;
	char *tmpaddr;

	if (nconf == NULL) {
		rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
		return NULL;
	}

	if (nconf->nc_protofmly != NULL &&
	    strcmp(nconf->nc_protofmly, NC_LOOPBACK) != 0 &&
	    host == NULL) {
		rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
		return NULL;
	}



	/* Get the address of the rpcbind.  Check cache first */
	client = NULL;
	if (targaddr)
		*targaddr = NULL;

	if (host != NULL)  {
		struct address_cache *ad_cache;

		/* Get an MT-safe copy of the cached address (if any) */
		ad_cache = copy_of_cached(host, nconf->nc_netid);
		if (ad_cache != NULL) {
			client = clnt_tli_create(RPC_ANYFD, nconf, ad_cache->ac_taddr,
							(rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0);
			if (client != NULL) {
				if (targaddr && ad_cache->ac_uaddr) {
					*targaddr = ad_cache->ac_uaddr;
					ad_cache->ac_uaddr = NULL; /* De-reference before destruction */
				}
				destroy_addr(ad_cache);
				return (client);
			}

			delete_cache(ad_cache->ac_taddr);
			destroy_addr(ad_cache);
		}
	}

	if (!__rpc_nconf2sockinfo(nconf, &si)) {
		rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
		assert(client == NULL);
		goto out_err;
	}

	memset(&hints, 0, sizeof hints);
	hints.ai_family = si.si_af;
	hints.ai_socktype = si.si_socktype;
	hints.ai_protocol = si.si_proto;

	LIBTIRPC_DEBUG(3, ("getclnthandle: trying netid %s family %d proto %d socktype %d\n",
	    nconf->nc_netid, si.si_af, si.si_proto, si.si_socktype));

	if (nconf->nc_protofmly != NULL && strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
		client = local_rpcb();
		if (! client) {
			LIBTIRPC_DEBUG(1, ("getclnthandle: %s", 
				clnt_spcreateerror("local_rpcb failed")));
			goto out_err;
		} else {
			struct sockaddr_un sun;

			if (targaddr) {
				*targaddr = malloc(sizeof(sun.sun_path));
				strncpy(*targaddr, _PATH_RPCBINDSOCK,
				    sizeof(sun.sun_path));
			}
			return (client);
		}
	} else {
		if (getaddrinfo(host, "sunrpc", &hints, &res) != 0) {
			rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
			assert(client == NULL);
			goto out_err;
		}
	}

	for (tres = res; tres != NULL; tres = tres->ai_next) {
		taddr.buf = tres->ai_addr;
		taddr.len = taddr.maxlen = tres->ai_addrlen;

		if (libtirpc_debug_level > 3 && log_stderr) {
			char *ua;
			int i;

			ua = taddr2uaddr(nconf, &taddr);
			fprintf(stderr, "Got it [%s]\n", ua); 
			free(ua);

			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");
		}

		client = clnt_tli_create(RPC_ANYFD, nconf, &taddr,
		    (rpcprog_t)RPCBPROG, (rpcvers_t)RPCBVERS4, 0, 0);
		if (! client) {
			LIBTIRPC_DEBUG(1, ("getclnthandle: %s", 
				clnt_spcreateerror("clnt_tli_create failed")));
		}

		if (client) {
			tmpaddr = targaddr ? taddr2uaddr(nconf, &taddr) : NULL;
			if (host)
				add_cache(host, nconf->nc_netid, &taddr, tmpaddr);
			if (targaddr)
				*targaddr = tmpaddr;
			break;
		}
	}
	if (res)
		freeaddrinfo(res);
out_err:
	if (!client && targaddr)
		free(*targaddr);
	return (client);
}

/*
 * Create a PMAP client handle.
 */
static CLIENT *
getpmaphandle(nconf, hostname, tgtaddr)
	const struct netconfig *nconf;
	const char *hostname;
	char **tgtaddr;
{
	CLIENT *client = NULL;
	rpcvers_t pmapvers = 2;

	if (nconf == NULL) {
		struct netconfig *newnconf;

		if ((newnconf = getnetconfigent("udp")) == NULL) {
			rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
			return NULL;
		}
		client = getclnthandle(hostname, newnconf, tgtaddr);
		freenetconfigent(newnconf);
	} else if (strcmp(nconf->nc_proto, NC_UDP) == 0 ||
	    strcmp(nconf->nc_proto, NC_TCP) == 0) {
		if (strcmp(nconf->nc_protofmly, NC_INET) != 0)
			return NULL;
		client = getclnthandle(hostname, nconf, tgtaddr);
	}

	/* Set version */
	if (client != NULL)
		CLNT_CONTROL(client, CLSET_VERS, (char *)&pmapvers);

	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()
{
	CLIENT *client;
	static struct netconfig *loopnconf;
	static char *hostname;
	extern mutex_t loopnconf_lock;
	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_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) {
 			rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
			mutex_unlock(&loopnconf_lock);
			endnetconfig(nc_handle);
			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.
 */
bool_t
rpcb_set(program, version, nconf, address)
	rpcprog_t program;
	rpcvers_t version;
	const struct netconfig *nconf;	/* Network structure of transport */
	const struct netbuf *address;		/* Services netconfig 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 *)&parms, (xdrproc_t) xdr_bool,
	    (char *)&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(program, version, nconf)
	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);
}

#ifdef NOTUSED
/*
 * From the merged list, find the appropriate entry
 */
static struct netbuf *
got_entry(relp, nconf)
	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);
			LIBTIRPC_DEBUG(3, ("got_entry: Remote address is [%s] %s", 
				rmap->r_maddr, (na ? "Resolvable" : "Not Resolvable")));
			break;
		}
	}
	return (na);
}

/*
 * Quick check to see if rpcbind is up.  Tries to connect over
 * local transport.
 */
bool_t
__rpcbind_is_up()
{
	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;
	}
	if (nconf == NULL)
		return (FALSE);

	endnetconfig(localhandle);

	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));

	if (connect(sock, (struct sockaddr *)&sun, sizeof(sun)) < 0) {
		close(sock);
		return (FALSE);
	}

	close(sock);
	return (TRUE);
}
#endif

#ifdef PORTMAP
static struct netbuf *
__try_protocol_version_2(program, version, nconf, host, tp)
	rpcprog_t program;
	rpcvers_t version;
	const struct netconfig *nconf;
	const char *host;
	struct timeval *tp;
{
	u_short port = 0;
	struct netbuf remote;
	struct pmap pmapparms;
	CLIENT *client = NULL;
	enum clnt_stat clnt_st;
	struct netbuf *pmapaddress;
	RPCB parms;

	if (strcmp(nconf->nc_proto, NC_UDP) != 0
	 && strcmp(nconf->nc_proto, NC_TCP) != 0)
		return (NULL);

	client = getpmaphandle(nconf, host, &parms.r_addr);
	if (client == NULL)
		goto error;

	/*
	 * Set retry timeout.
	 */
	CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, (char *)&rpcbrmttime);

	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) {
		rpc_createerr.cf_stat = RPC_PMAPFAILURE;
		clnt_geterr(client, &rpc_createerr.cf_error);
		goto error;
	} else if (port == 0) {
		pmapaddress = NULL;
		rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
		goto error;
	}
	port = htons(port);
	CLNT_CONTROL(client, CLGET_SVC_ADDR, (char *)&remote);
	if (((pmapaddress = (struct netbuf *)
		malloc(sizeof (struct netbuf))) == NULL) ||
	    ((pmapaddress->buf = (char *)
		malloc(remote.len)) == NULL)) {
		rpc_createerr.cf_stat = RPC_SYSTEMERROR;
		clnt_geterr(client, &rpc_createerr.cf_error);
		if (pmapaddress) {
			free(pmapaddress);
			pmapaddress = NULL;
		}
		goto error;
	}
	memcpy(pmapaddress->buf, remote.buf, remote.len);
	memcpy(&((char *)pmapaddress->buf)[sizeof (short)],
			(char *)(void *)&port, sizeof (short));
	pmapaddress->len = pmapaddress->maxlen = remote.len;

	CLNT_DESTROY(client);

	if (parms.r_addr != NULL && parms.r_addr != nullstring)
		free(parms.r_addr);

	return pmapaddress;

error:
	if (client) {
		CLNT_DESTROY(client);
		client = NULL;

	}

	if (parms.r_addr != NULL && parms.r_addr != nullstring)
		free(parms.r_addr);

	return (NULL);

}
#endif

/*
 * 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 4 (srv4), then 3 and then fall back to version 2 (portmap).
 * With this algorithm, we get performance as well as a plan for
 * obsoleting version 2. This behaviour is reverted to old algorithm
 * if RPCB_V2FIRST environment var is defined
 *
 * 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(program, version, nconf, host, clpp, tp)
	rpcprog_t program;
	rpcvers_t version;
	const struct netconfig *nconf;
	const char *host;
	CLIENT **clpp;
	struct timeval *tp;
{
#ifdef NOTUSED
	static bool_t check_rpcbind = TRUE;
#endif

#ifdef PORTMAP
	static bool_t portmap_first = FALSE;
#endif
	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;
	struct rpc_err rpcerr;

	/* 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;

	parms.r_prog = program;
	parms.r_vers = version;
	parms.r_netid = nconf->nc_netid;

	/*
	 * rpcbind ignores the r_owner field in GETADDR requests, but we
	 * need to give xdr_rpcb something to gnaw on. Might as well make
	 * it something human readable for when we see these in captures.
	 */
	parms.r_owner = RPCB_OWNER_STRING;

	/* 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;
		free(parms.r_addr);
		parms.r_addr = 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(4) and then version 3 (RPCBVERS), except
	 * if env. var RPCB_V2FIRST is defined */

#ifdef PORTMAP
	if (getenv(V2FIRST)) {
		portmap_first = TRUE;
		LIBTIRPC_DEBUG(3, ("__rpcb_findaddr_timed: trying v2-port first\n"));
		goto portmap;
	}
#endif

rpcbind:
	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);
		switch (clnt_st) {
		case RPC_SUCCESS:
			if ((ua == NULL) || (ua[0] == 0)) {
				/* address unknown */
				rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
				goto error;
			}
			address = uaddr2taddr(nconf, ua);
			LIBTIRPC_DEBUG(3, ("__rpcb_findaddr_timed: Remote address is [%s] %s", 
				ua, (address ? "Resolvable" : "Not Resolvable")));

			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;
		case RPC_PROGVERSMISMATCH:
			clnt_geterr(client, &rpcerr);
			if (rpcerr.re_vers.low > RPCBVERS4)
				goto error;  /* a new version, can't handle */
			/* Try the next lower version */
		case RPC_PROGUNAVAIL:
		case RPC_CANTDECODEARGS:
			break;
		default:
			/* Cant handle this error */
			rpc_createerr.cf_stat = clnt_st;
			clnt_geterr(client, &rpc_createerr.cf_error);
			goto error;
		}
	}

#ifdef PORTMAP 	/* Try version 2 for TCP or UDP */
	if (portmap_first)
		goto error; /* we tried all versions if reached here */
portmap:
	if (strcmp(nconf->nc_protofmly, NC_INET) == 0) {
		address = __try_protocol_version_2(program, version, nconf, host, tp);
		if (address == NULL) {
			if (portmap_first)
				goto rpcbind;
			else
				goto error;
		}
	}
#endif		/* PORTMAP */

	if ((address == NULL) || (address->len == 0)) {
	  rpc_createerr.cf_stat = RPC_PROGNOTREGISTERED;
	  clnt_geterr(client, &rpc_createerr.cf_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
 */
int
rpcb_getaddr(program, version, nconf, address, host)
	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(nconf, host)
	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.
*/
enum clnt_stat
rpcb_rmtcall(nconf, host, prog, vers, proc, xdrargs, argsp,
		xdrres, resp, tout, addr_ptr)
	const struct netconfig *nconf;	/* Netconfig structure */
	const char *host;			/* Remote host name */
	rpcprog_t prog;
	rpcvers_t vers;
	rpcproc_t proc;			/* Remote proc identifiers */
	xdrproc_t xdrargs, xdrres;	/* XDR routines */
	caddr_t argsp, resp;		/* Argument and Result */
	struct timeval tout;		/* Timeout value for this call */
	const struct netbuf *addr_ptr;	/* Preallocated netbuf address */
{
	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(host, timep)
	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(nconf, taddr)
	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(nconf, uaddr)
	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);
}