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
portal_tcp(struct portal_cred * pcr,char * key,char ** v,int * fdp)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