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 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 *	@(#)activate.c	8.3 (Berkeley) 4/28/95
34 */
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD$");
38
39#include <errno.h>
40#include <string.h>
41#include <unistd.h>
42#include <sys/types.h>
43#include <sys/param.h>
44#include <sys/socket.h>
45#include <sys/syslog.h>
46#include <sys/uio.h>
47
48#include "portald.h"
49
50/*
51 * Scan the providers list and call the
52 * appropriate function.
53 */
54static int activate_argv(struct portal_cred *pcr, char *key, char **v, int so,
55    int *fdp)
56{
57	provider *pr;
58
59	for (pr = providers; pr->pr_match; pr++)
60		if (strcmp(v[0], pr->pr_match) == 0)
61			return ((*pr->pr_func)(pcr, key, v, so, fdp));
62
63	return (ENOENT);
64}
65
66static int get_request(int so, struct portal_cred *pcr, char *key, int klen)
67{
68	struct iovec iov[2];
69	struct msghdr msg;
70	int n;
71
72	iov[0].iov_base = (caddr_t) pcr;
73	iov[0].iov_len = sizeof(*pcr);
74	iov[1].iov_base = key;
75	iov[1].iov_len = klen;
76
77	memset(&msg, 0, sizeof(msg));
78	msg.msg_iov = iov;
79	msg.msg_iovlen = 2;
80
81	n = recvmsg(so, &msg, 0);
82	if (n < 0)
83		return (errno);
84
85	if (n <= (int)sizeof(*pcr))
86		return (EINVAL);
87
88	n -= sizeof(*pcr);
89	key[n] = '\0';
90
91	return (0);
92}
93
94static void send_reply(int so, int fd, int error)
95{
96	int n;
97	struct iovec iov;
98	struct msghdr msg;
99	union {
100		struct cmsghdr cmsg;
101		char control[CMSG_SPACE(sizeof(int))];
102	} ctl;
103
104	/*
105	 * Line up error code.  Don't worry about byte ordering
106	 * because we must be sending to the local machine.
107	 */
108	iov.iov_base = (caddr_t) &error;
109	iov.iov_len = sizeof(error);
110
111	/*
112	 * Build a msghdr
113	 */
114	memset(&msg, 0, sizeof(msg));
115	msg.msg_iov = &iov;
116	msg.msg_iovlen = 1;
117
118	/*
119	 * If there is a file descriptor to send then
120	 * construct a suitable rights control message.
121	 */
122	if (fd >= 0) {
123		ctl.cmsg.cmsg_len = CMSG_LEN(sizeof(int));
124		ctl.cmsg.cmsg_level = SOL_SOCKET;
125		ctl.cmsg.cmsg_type = SCM_RIGHTS;
126		*((int *)CMSG_DATA(&ctl.cmsg)) = fd;
127		msg.msg_control = (caddr_t) &ctl;
128		msg.msg_controllen = ctl.cmsg.cmsg_len;
129	}
130
131	/*
132	 * Send to kernel...
133	 */
134	if ((n = sendmsg(so, &msg, 0)) < 0)
135		syslog(LOG_ERR, "send: %s", strerror(errno));
136#ifdef DEBUG
137	fprintf(stderr, "sent %d bytes\n", n);
138#endif
139	sleep(1);	/*XXX*/
140#ifdef notdef
141	if (shutdown(so, SHUT_RDWR) < 0)
142		syslog(LOG_ERR, "shutdown: %s", strerror(errno));
143#endif
144	/*
145	 * Throw away the open file descriptor
146	 */
147	(void) close(fd);
148}
149
150void activate(qelem *q, int so)
151{
152	struct portal_cred pcred;
153	char key[MAXPATHLEN+1];
154	int error;
155	char **v;
156	int fd = -1;
157
158	/*
159	 * Read the key from the socket
160	 */
161	error = get_request(so, &pcred, key, sizeof(key));
162	if (error) {
163		syslog(LOG_ERR, "activate: recvmsg: %s", strerror(error));
164		goto drop;
165	}
166
167#ifdef DEBUG
168	fprintf(stderr, "lookup key %s\n", key);
169#endif
170
171	/*
172	 * Find a match in the configuration file
173	 */
174	v = conf_match(q, key);
175
176	/*
177	 * If a match existed, then find an appropriate portal
178	 * otherwise simply return ENOENT.
179	 */
180	if (v) {
181		error = activate_argv(&pcred, key, v, so, &fd);
182		if (error)
183			fd = -1;
184		else if (fd < 0)
185			error = -1;
186	} else {
187		error = ENOENT;
188	}
189
190	if (error >= 0)
191		send_reply(so, fd, error);
192
193drop:;
194	close(so);
195}
196