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      1 /*	$NetBSD: pt_tcp.c,v 1.21 2009/04/11 07:36:43 lukem Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1992, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software donated to Berkeley by
      8  * Jan-Simon Pendry.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	from: Id: pt_tcp.c,v 1.1 1992/05/25 21:43:09 jsp Exp
     35  *	@(#)pt_tcp.c	8.5 (Berkeley) 4/28/95
     36  */
     37 
     38 #include <sys/cdefs.h>
     39 #ifndef lint
     40 __RCSID("$NetBSD: pt_tcp.c,v 1.21 2009/04/11 07:36:43 lukem Exp $");
     41 #endif /* not lint */
     42 
     43 #include <stdio.h>
     44 #include <unistd.h>
     45 #include <stdlib.h>
     46 #include <errno.h>
     47 #include <string.h>
     48 #include <sys/types.h>
     49 #include <sys/param.h>
     50 #include <sys/syslog.h>
     51 #include <sys/socket.h>
     52 #include <netinet/in.h>
     53 #include <arpa/inet.h>
     54 #include <netdb.h>
     55 
     56 #include "portald.h"
     57 
     58 /*
     59  * Key will be tcp/host/port[/"priv"]
     60  * Create a TCP socket connected to the
     61  * requested host and port.
     62  * Some trailing suffix values have special meanings.
     63  * An unrecognised suffix is an error.
     64  */
     65 int
     66 portal_tcp(struct portal_cred *pcr, char *key, char **v, int *fdp)
     67 {
     68 	char host[MAXHOSTNAMELEN];
     69 	char port[MAXHOSTNAMELEN];
     70 	char *p = key + (v[1] ? strlen(v[1]) : 0);
     71 	char *q;
     72 	int priv = 0;
     73 	struct addrinfo hints, *res, *lres;
     74 	int so = -1;
     75 	const char *cause = "unknown";
     76 
     77 	q = strchr(p, '/');
     78 	if (q == 0 || (size_t)(q - p) >= sizeof(host))
     79 		return (EINVAL);
     80 	*q = '\0';
     81 	if (strlcpy(host, p, sizeof(host)) >= sizeof(host))
     82 		return (EINVAL);
     83 	p = q + 1;
     84 
     85 	q = strchr(p, '/');
     86 	if (q)
     87 		*q = '\0';
     88 	if (strlcpy(port, p, sizeof(port)) >= sizeof(port))
     89 		return (EINVAL);
     90 	if (q) {
     91 		p = q + 1;
     92 		if (strcmp(p, "priv") == 0) {
     93 			if (pcr->pcr_uid == 0)
     94 				priv = 1;
     95 			else
     96 				return (EPERM);
     97 		} else {
     98 			return (EINVAL);
     99 		}
    100 	}
    101 
    102 	memset(&hints, 0, sizeof(hints));
    103 	hints.ai_family = PF_UNSPEC;
    104 	hints.ai_socktype = SOCK_STREAM;
    105 	hints.ai_protocol = 0;
    106 	if (getaddrinfo(host, port, &hints, &res) != 0)
    107 		return(EINVAL);
    108 
    109 	for (lres = res; lres; lres = lres->ai_next) {
    110 		if (priv)
    111 			so = rresvport((int *) 0);
    112 		else
    113 			so = socket(lres->ai_family, lres->ai_socktype,
    114 			    lres->ai_protocol);
    115 		if (so < 0) {
    116 			cause = "socket";
    117 			continue;
    118 		}
    119 
    120 		if (connect(so, lres->ai_addr, lres->ai_addrlen) != 0) {
    121 			cause = "connect";
    122 			(void)close(so);
    123 			so = -1;
    124 			continue;
    125 		}
    126 
    127 		*fdp = so;
    128 		errno = 0;
    129 		break;
    130 	}
    131 
    132 	if (so < 0)
    133 		syslog(LOG_WARNING, "%s: %m", cause);
    134 
    135 	freeaddrinfo(res);
    136 
    137 	return (errno);
    138 }
    139