1/*	$NetBSD: pt_tcp.c,v 1.20 2007/07/02 18:07:45 pooka 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 1.20 2007/07/02 18:07:45 pooka 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 */
65int
66portal_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