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pt_tcp.c revision 1.6 
      1 /*
      2  * Copyright (c) 1992, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software donated to Berkeley by
      7  * Jan-Simon Pendry.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by the University of
     20  *	California, Berkeley and its contributors.
     21  * 4. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  *
     37  *	from: Id: pt_tcp.c,v 1.1 1992/05/25 21:43:09 jsp Exp
     38  *	from: @(#)pt_tcp.c	8.3 (Berkeley) 3/27/94
     39  *	$Id: pt_tcp.c,v 1.6 1994/09/23 14:27:34 mycroft Exp $
     40  */
     41 
     42 #include <stdio.h>
     43 #include <unistd.h>
     44 #include <stdlib.h>
     45 #include <errno.h>
     46 #include <strings.h>
     47 #include <sys/types.h>
     48 #include <sys/param.h>
     49 #include <sys/syslog.h>
     50 #include <sys/socket.h>
     51 #include <netinet/in.h>
     52 #include <arpa/inet.h>
     53 #include <netdb.h>
     54 
     55 #include "portald.h"
     56 
     57 /*
     58  * Key will be tcp/host/port[/"priv"]
     59  * Create a TCP socket connected to the
     60  * requested host and port.
     61  * Some trailing suffix values have special meanings.
     62  * An unrecognised suffix is an error.
     63  */
     64 int portal_tcp(pcr, key, v, kso, fdp)
     65 struct portal_cred *pcr;
     66 char *key;
     67 char **v;
     68 int kso;
     69 int *fdp;
     70 {
     71 	char host[MAXHOSTNAMELEN];
     72 	char port[MAXHOSTNAMELEN];
     73 	char *p = key + (v[1] ? strlen(v[1]) : 0);
     74 	char *q;
     75 	struct hostent *hp;
     76 	struct servent *sp;
     77 	struct in_addr **ipp;
     78 	struct in_addr *ip[2];
     79 	struct in_addr ina;
     80 	int s_port;
     81 	int priv = 0;
     82 	struct sockaddr_in sain;
     83 
     84 	q = strchr(p, '/');
     85 	if (q == 0 || q - p >= sizeof(host))
     86 		return (EINVAL);
     87 	*q = '\0';
     88 	strcpy(host, p);
     89 	p = q + 1;
     90 
     91 	q = strchr(p, '/');
     92 	if (q)
     93 		*q = '\0';
     94 	if (strlen(p) >= sizeof(port))
     95 		return (EINVAL);
     96 	strcpy(port, p);
     97 	if (q) {
     98 		p = q + 1;
     99 		if (strcmp(p, "priv") == 0) {
    100 			if (pcr->pcr_uid == 0)
    101 				priv = 1;
    102 			else
    103 				return (EPERM);
    104 		} else {
    105 			return (EINVAL);
    106 		}
    107 	}
    108 
    109 	hp = gethostbyname(host);
    110 	if (hp != 0) {
    111 		ipp = (struct in_addr **) hp->h_addr_list;
    112 	} else {
    113 		ina.s_addr = inet_addr(host);
    114 		if (ina.s_addr == INADDR_NONE)
    115 			return (EINVAL);
    116 		ip[0] = &ina;
    117 		ip[1] = 0;
    118 		ipp = ip;
    119 	}
    120 
    121 	sp = getservbyname(port, "tcp");
    122 	if (sp != 0)
    123 		s_port = sp->s_port;
    124 	else {
    125 		s_port = htons(atoi(port));
    126 		if (s_port == 0)
    127 			return (EINVAL);
    128 	}
    129 
    130 	memset(&sain, 0, sizeof(sain));
    131 	sain.sin_len = sizeof(sain);
    132 	sain.sin_family = AF_INET;
    133 	sain.sin_port = s_port;
    134 
    135 	while (ipp[0]) {
    136 		int so;
    137 
    138 		if (priv)
    139 			so = rresvport((int *) 0);
    140 		else
    141 			so = socket(AF_INET, SOCK_STREAM, 0);
    142 		if (so < 0) {
    143 			syslog(LOG_ERR, "socket: %m");
    144 			return (errno);
    145 		}
    146 
    147 		sain.sin_addr = *ipp[0];
    148 		if (connect(so, (struct sockaddr *) &sain, sizeof(sain)) == 0) {
    149 			*fdp = so;
    150 			return (0);
    151 		}
    152 		(void) close(so);
    153 
    154 		ipp++;
    155 	}
    156 
    157 	return (errno);
    158 }
    159