libc/rpc/rpc_soc.c

/*	$NetBSD: rpc_soc.c,v 1.6 2000/07/06 03:10:35 christos Exp $	*/

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 2009, Sun Microsystems, 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 Sun Microsystems, 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.
 */

/* #ident	"@(#)rpc_soc.c	1.17	94/04/24 SMI" */

/*
 * Copyright (c) 1986-1991 by Sun Microsystems Inc.
 * In addition, portions of such source code were derived from Berkeley
 * 4.3 BSD under license from the Regents of the University of
 * California.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)rpc_soc.c 1.41 89/05/02 Copyr 1988 Sun Micro";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: stable/12/lib/libc/rpc/rpc_soc.c 371495 2022-01-15 12:59:04Z kib $");

#ifdef PORTMAP
/*
 * rpc_soc.c
 *
 * The backward compatibility routines for the earlier implementation
 * of RPC, where the only transports supported were tcp/ip and udp/ip.
 * Based on berkeley socket abstraction, now implemented on the top
 * of TLI/Streams
 */

#include "namespace.h"
#include "reentrant.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#include <rpc/pmap_prot.h>
#include <rpc/nettype.h>
#include <syslog.h>
#include <netinet/in.h>
#include <netdb.h>
#include <errno.h>
#include <syslog.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "un-namespace.h"

#include "rpc_com.h"
#include "mt_misc.h"

static CLIENT *clnt_com_create(struct sockaddr_in *, rpcprog_t, rpcvers_t,
    int *, u_int, u_int, char *);
static SVCXPRT *svc_com_create(int, u_int, u_int, char *);
static bool_t rpc_wrap_bcast(char *, struct netbuf *, struct netconfig *);

/* XXX */
#define IN4_LOCALHOST_STRING    "127.0.0.1"
#define IN6_LOCALHOST_STRING    "::1"

/*
 * A common clnt create routine
 */
static CLIENT *
clnt_com_create(struct sockaddr_in *raddr, rpcprog_t prog, rpcvers_t vers, int *sockp,
    u_int sendsz, u_int recvsz, char *tp)
{
	CLIENT *cl;
	int madefd = FALSE;
	int fd = *sockp;
	struct netconfig *nconf;
	struct netbuf bindaddr;

	mutex_lock(&rpcsoc_lock);
	if ((nconf = __rpc_getconfip(tp)) == NULL) {
		rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
		mutex_unlock(&rpcsoc_lock);
		return (NULL);
	}
	if (fd == RPC_ANYSOCK) {
		fd = __rpc_nconf2fd(nconf);
		if (fd == -1)
			goto syserror;
		madefd = TRUE;
	}

	if (raddr->sin_port == 0) {
		u_int proto;
		u_short sport;

		mutex_unlock(&rpcsoc_lock);	/* pmap_getport is recursive */
		proto = strcmp(tp, "udp") == 0 ? IPPROTO_UDP : IPPROTO_TCP;
		sport = pmap_getport(raddr, (u_long)prog, (u_long)vers,
		    proto);
		mutex_lock(&rpcsoc_lock);	/* pmap_getport is recursive */
		if (sport == 0) {
			goto err;
		}
		raddr->sin_port = htons(sport);
	}

	/* Transform sockaddr_in to netbuf */
	bindaddr.maxlen = bindaddr.len =  sizeof (struct sockaddr_in);
	bindaddr.buf = raddr;

	bindresvport(fd, NULL);
	cl = clnt_tli_create(fd, nconf, &bindaddr, prog, vers,
				sendsz, recvsz);
	if (cl) {
		if (madefd == TRUE) {
			/*
			 * The fd should be closed while destroying the handle.
			 */
			(void) CLNT_CONTROL(cl, CLSET_FD_CLOSE, NULL);
			*sockp = fd;
		}
		(void) freenetconfigent(nconf);
		mutex_unlock(&rpcsoc_lock);
		return (cl);
	}
	goto err;

syserror:
	rpc_createerr.cf_stat = RPC_SYSTEMERROR;
	rpc_createerr.cf_error.re_errno = errno;

err:	if (madefd == TRUE)
		(void)_close(fd);
	(void) freenetconfigent(nconf);
	mutex_unlock(&rpcsoc_lock);
	return (NULL);
}

CLIENT *
clntudp_bufcreate(struct sockaddr_in *raddr, u_long prog, u_long vers,
    struct timeval wait, int *sockp, u_int sendsz, u_int recvsz)
{
	CLIENT *cl;

	cl = clnt_com_create(raddr, (rpcprog_t)prog, (rpcvers_t)vers, sockp,
	    sendsz, recvsz, "udp");
	if (cl == NULL) {
		return (NULL);
	}
	(void) CLNT_CONTROL(cl, CLSET_RETRY_TIMEOUT, &wait);
	return (cl);
}

CLIENT *
clntudp_create(struct sockaddr_in *raddr, u_long program, u_long version,
    struct timeval wait, int *sockp)
{

	return clntudp_bufcreate(raddr, program, version, wait, sockp,
					UDPMSGSIZE, UDPMSGSIZE);
}

CLIENT *
clnttcp_create(struct sockaddr_in *raddr, u_long prog, u_long vers, int *sockp,
    u_int sendsz, u_int recvsz)
{

	return clnt_com_create(raddr, (rpcprog_t)prog, (rpcvers_t)vers, sockp,
	    sendsz, recvsz, "tcp");
}

CLIENT *
clntraw_create(u_long prog, u_long vers)
{

	return clnt_raw_create((rpcprog_t)prog, (rpcvers_t)vers);
}

/*
 * A common server create routine
 */
static SVCXPRT *
svc_com_create(int fd, u_int sendsize, u_int recvsize, char *netid)
{
	struct netconfig *nconf;
	SVCXPRT *svc;
	int madefd = FALSE;
	int port;
	struct sockaddr_in sin;

	if ((nconf = __rpc_getconfip(netid)) == NULL) {
		(void) syslog(LOG_ERR, "Could not get %s transport", netid);
		return (NULL);
	}
	if (fd == RPC_ANYSOCK) {
		fd = __rpc_nconf2fd(nconf);
		if (fd == -1) {
			(void) freenetconfigent(nconf);
			(void) syslog(LOG_ERR,
			"svc%s_create: could not open connection", netid);
			return (NULL);
		}
		madefd = TRUE;
	}

	memset(&sin, 0, sizeof sin);
	sin.sin_family = AF_INET;
	bindresvport(fd, &sin);
	_listen(fd, SOMAXCONN);
	svc = svc_tli_create(fd, nconf, NULL, sendsize, recvsize);
	(void) freenetconfigent(nconf);
	if (svc == NULL) {
		if (madefd)
			(void)_close(fd);
		return (NULL);
	}
	port = (((struct sockaddr_in *)svc->xp_ltaddr.buf)->sin_port);
	svc->xp_port = ntohs(port);
	return (svc);
}

SVCXPRT *
svctcp_create(int fd, u_int sendsize, u_int recvsize)
{

	return svc_com_create(fd, sendsize, recvsize, "tcp");
}

SVCXPRT *
svcudp_bufcreate(int fd, u_int sendsz, u_int recvsz)
{

	return svc_com_create(fd, sendsz, recvsz, "udp");
}

SVCXPRT *
svcfd_create(int fd, u_int sendsize, u_int recvsize)
{

	return svc_fd_create(fd, sendsize, recvsize);
}


SVCXPRT *
svcudp_create(int fd)
{

	return svc_com_create(fd, UDPMSGSIZE, UDPMSGSIZE, "udp");
}

SVCXPRT *
svcraw_create(void)
{

	return svc_raw_create();
}

int
get_myaddress(struct sockaddr_in *addr)
{

	memset((void *) addr, 0, sizeof(*addr));
	addr->sin_family = AF_INET;
	addr->sin_port = htons(PMAPPORT);
	addr->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
	return (0);
}

/*
 * For connectionless "udp" transport. Obsoleted by rpc_call().
 */
int
callrpc(const char *host, int prognum, int versnum, int procnum,
    xdrproc_t inproc, void *in, xdrproc_t outproc, void *out)
{

	return (int)rpc_call(host, (rpcprog_t)prognum, (rpcvers_t)versnum,
	    (rpcproc_t)procnum, inproc, in, outproc, out, "udp");
}

/*
 * For connectionless kind of transport. Obsoleted by rpc_reg()
 */
int
registerrpc(int prognum, int versnum, int procnum,
    char *(*progname)(char [UDPMSGSIZE]),
    xdrproc_t inproc, xdrproc_t outproc)
{

	return rpc_reg((rpcprog_t)prognum, (rpcvers_t)versnum,
	    (rpcproc_t)procnum, progname, inproc, outproc, "udp");
}

/*
 * All the following clnt_broadcast stuff is convulated; it supports
 * the earlier calling style of the callback function
 */
static thread_key_t	clnt_broadcast_key;
static resultproc_t	clnt_broadcast_result_main;
static once_t		clnt_broadcast_once = ONCE_INITIALIZER;

static void
clnt_broadcast_key_init(void)
{

	thr_keycreate(&clnt_broadcast_key, free);
}

/*
 * Need to translate the netbuf address into sockaddr_in address.
 * Dont care about netid here.
 */
/* ARGSUSED */
static bool_t
rpc_wrap_bcast(char *resultp, struct netbuf *addr, struct netconfig *nconf)
/*
 *	char *resultp;		// results of the call
 *	struct netbuf *addr;	// address of the guy who responded
 *	struct netconfig *nconf; // Netconf of the transport
 */
{
	resultproc_t clnt_broadcast_result;

	if (strcmp(nconf->nc_netid, "udp"))
		return (FALSE);
	if (thr_main())
		clnt_broadcast_result = clnt_broadcast_result_main;
	else
		clnt_broadcast_result = (resultproc_t)thr_getspecific(clnt_broadcast_key);
	return (*clnt_broadcast_result)(resultp,
				(struct sockaddr_in *)addr->buf);
}

/*
 * Broadcasts on UDP transport. Obsoleted by rpc_broadcast().
 */
enum clnt_stat
clnt_broadcast(u_long prog, u_long vers, u_long proc, xdrproc_t xargs,
    void *argsp, xdrproc_t xresults, void *resultsp, resultproc_t eachresult)
/*
 *	u_long		prog;		// program number
 *	u_long		vers;		// version number
 *	u_long		proc;		// procedure number
 *	xdrproc_t	xargs;		// xdr routine for args
 *	void	       *argsp;		// pointer to args
 *	xdrproc_t	xresults;	// xdr routine for results
 *	void	       *resultsp;	// pointer to results
 *	resultproc_t	eachresult;	// call with each result obtained
 */
{

	if (thr_main())
		clnt_broadcast_result_main = eachresult;
	else {
		thr_once(&clnt_broadcast_once, clnt_broadcast_key_init);
		thr_setspecific(clnt_broadcast_key, (void *) eachresult);
	}
	return rpc_broadcast((rpcprog_t)prog, (rpcvers_t)vers,
	    (rpcproc_t)proc, xargs, argsp, xresults, resultsp,
	    (resultproc_t) rpc_wrap_bcast, "udp");
}

/*
 * Create the client des authentication object. Obsoleted by
 * authdes_seccreate().
 */
AUTH *
authdes_create(char *servername, u_int window, struct sockaddr *syncaddr,
    des_block *ckey)
/*
 *	char *servername;		// network name of server
 *	u_int window;			// time to live
 *	struct sockaddr *syncaddr;	// optional hostaddr to sync with
 *	des_block *ckey;		// optional conversation key to use
 */
{
	AUTH *dummy;
	AUTH *nauth;
	char hostname[NI_MAXHOST];

	if (syncaddr) {
		/*
		 * Change addr to hostname, because that is the way
		 * new interface takes it.
		 */
		if (getnameinfo(syncaddr, syncaddr->sa_len, hostname,
		    sizeof hostname, NULL, 0, 0) != 0)
			goto fallback;

		nauth = authdes_seccreate(servername, window, hostname, ckey);
		return (nauth);
	}
fallback:
	dummy = authdes_seccreate(servername, window, NULL, ckey);
	return (dummy);
}

/*
 * Create a client handle for a unix connection. Obsoleted by clnt_vc_create()
 */
CLIENT *
clntunix_create(struct sockaddr_un *raddr, u_long prog, u_long vers, int *sockp,
    u_int sendsz, u_int recvsz)
{
	struct netbuf *svcaddr;
	CLIENT *cl;
	int len;

	cl = NULL;
	svcaddr = NULL;
	if ((raddr->sun_len == 0) ||
	   ((svcaddr = malloc(sizeof(struct netbuf))) == NULL ) ||
	   ((svcaddr->buf = malloc(sizeof(struct sockaddr_un))) == NULL)) {
		free(svcaddr);
		rpc_createerr.cf_stat = RPC_SYSTEMERROR;
		rpc_createerr.cf_error.re_errno = errno;
		return(cl);
	}
	if (*sockp < 0) {
		*sockp = _socket(AF_LOCAL, SOCK_STREAM, 0);
		len = raddr->sun_len = SUN_LEN(raddr);
		if ((*sockp < 0) || (_connect(*sockp,
		    (struct sockaddr *)raddr, len) < 0)) {
			rpc_createerr.cf_stat = RPC_SYSTEMERROR;
			rpc_createerr.cf_error.re_errno = errno;
			if (*sockp != -1)
				(void)_close(*sockp);
			goto done;
		}
	}
	svcaddr->buf = raddr;
	svcaddr->len = raddr->sun_len;
	svcaddr->maxlen = sizeof (struct sockaddr_un);
	cl = clnt_vc_create(*sockp, svcaddr, prog,
	    vers, sendsz, recvsz);
done:
	free(svcaddr->buf);
	free(svcaddr);
	return(cl);
}

/*
 * Creates, registers, and returns a (rpc) unix based transporter.
 * Obsoleted by svc_vc_create().
 */
SVCXPRT *
svcunix_create(int sock, u_int sendsize, u_int recvsize, char *path)
{
	struct netconfig *nconf;
	void *localhandle;
	struct sockaddr_un sun;
	struct sockaddr *sa;
	struct t_bind taddr;
	SVCXPRT *xprt;
	int addrlen;

	xprt = (SVCXPRT *)NULL;
	localhandle = setnetconfig();
	while ((nconf = getnetconfig(localhandle)) != NULL) {
		if (nconf->nc_protofmly != NULL &&
		    strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0)
			break;
	}
	if (nconf == NULL)
		goto done;

	if ((sock = __rpc_nconf2fd(nconf)) < 0)
		goto done;

	memset(&sun, 0, sizeof sun);
	sun.sun_family = AF_LOCAL;
	if (strlcpy(sun.sun_path, path, sizeof(sun.sun_path)) >=
	    sizeof(sun.sun_path))
		goto done;
	sun.sun_len = SUN_LEN(&sun);
	addrlen = sizeof (struct sockaddr_un);
	sa = (struct sockaddr *)&sun;

	if (_bind(sock, sa, addrlen) < 0)
		goto done;

	taddr.addr.len = taddr.addr.maxlen = addrlen;
	taddr.addr.buf = malloc(addrlen);
	if (taddr.addr.buf == NULL)
		goto done;
	memcpy(taddr.addr.buf, sa, addrlen);

	if (nconf->nc_semantics != NC_TPI_CLTS) {
		if (_listen(sock, SOMAXCONN) < 0) {
			free(taddr.addr.buf);
			goto done;
		}
	}

	xprt = (SVCXPRT *)svc_tli_create(sock, nconf, &taddr, sendsize, recvsize);

done:
	endnetconfig(localhandle);
	return(xprt);
}

/*
 * Like svunix_create(), except the routine takes any *open* UNIX file
 * descriptor as its first input. Obsoleted by svc_fd_create();
 */
SVCXPRT *
svcunixfd_create(int fd, u_int sendsize, u_int recvsize)
{
 	return (svc_fd_create(fd, sendsize, recvsize));
}

#endif /* PORTMAP */