1/*	$NetBSD: activate.c,v 1.14 2007/07/02 18:07:44 pooka Exp $	*/
2
3/*
4 * Copyright (c) 1992, 1993
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: activate.c,v 1.2 1992/05/27 07:09:27 jsp Exp
35 *	@(#)activate.c	8.3 (Berkeley) 4/28/95
36 */
37
38#include <sys/cdefs.h>
39#ifndef lint
40__RCSID("$NetBSD: activate.c,v 1.14 2007/07/02 18:07:44 pooka Exp $");
41#endif /* not lint */
42
43#include <stdio.h>
44#include <stdlib.h>
45#include <unistd.h>
46#include <string.h>
47#include <errno.h>
48#include <signal.h>
49#include <sys/types.h>
50#include <sys/param.h>
51#include <sys/socket.h>
52#include <sys/un.h>
53#include <sys/syslog.h>
54#include <sys/uio.h>
55
56#include "portald.h"
57
58static	int	get_request(int, struct portal_cred *, char *, size_t);
59static	void	send_reply(int, int, int);
60
61/*
62 * Scan the providers list and call the
63 * appropriate function.
64 */
65int
66activate_argv(struct portal_cred *pcr, char *key, char **v, int *fdp)
67{
68	provider *pr;
69
70	for (pr = providers; pr->pr_match; pr++)
71		if (strcmp(v[0], pr->pr_match) == 0)
72			return ((*pr->pr_func)(pcr, key, v, fdp));
73
74	return (ENOENT);
75}
76
77static int
78get_request(int so, struct portal_cred *pcr, char *key, size_t klen)
79{
80	struct iovec iov[2];
81	struct msghdr msg;
82	ssize_t n;
83
84	iov[0].iov_base = (caddr_t) pcr;
85	iov[0].iov_len = sizeof(*pcr);
86	iov[1].iov_base = key;
87	iov[1].iov_len = klen;
88
89	memset(&msg, 0, sizeof(msg));
90	msg.msg_iov = iov;
91	msg.msg_iovlen = 2;
92
93	n = recvmsg(so, &msg, 0);
94	if (n < 0)
95		return (errno);
96
97	if (n <= (ssize_t)sizeof(*pcr))
98		return (EINVAL);
99
100	n -= sizeof(*pcr);
101	key[n] = '\0';
102
103	return (0);
104}
105
106static void
107send_reply(int so, int fd, int error)
108{
109	int n;
110	struct iovec iov;
111	struct msghdr msg;
112	void *ctl = NULL;
113	struct cmsghdr *cmsg;
114	int *files;
115	socklen_t cmsgsize;
116
117	/*
118	 * Line up error code.  Don't worry about byte ordering
119	 * because we must be sending to the local machine.
120	 */
121	iov.iov_base = (caddr_t) &error;
122	iov.iov_len = sizeof(error);
123
124	/*
125	 * Build a msghdr
126	 */
127	memset(&msg, 0, sizeof(msg));
128	msg.msg_iov = &iov;
129	msg.msg_iovlen = 1;
130
131	/*
132	 * If there is a file descriptor to send then
133	 * construct a suitable rights control message.
134	 */
135	if (fd >= 0) {
136		cmsgsize = CMSG_LEN(sizeof(*files));
137
138		ctl = malloc(cmsgsize);
139		if (ctl == NULL) {
140			syslog(LOG_WARNING, "malloc control message: %m");
141			return;
142		}
143		memset(ctl, 0, cmsgsize);
144
145		cmsg = (struct cmsghdr *) ctl;
146		cmsg->cmsg_len = CMSG_LEN(sizeof(int));
147		cmsg->cmsg_level = SOL_SOCKET;
148		cmsg->cmsg_type = SCM_RIGHTS;
149
150		files = (int *)CMSG_DATA(cmsg);
151		files[0] = fd;
152
153		msg.msg_control = ctl;
154		msg.msg_controllen = cmsgsize;
155	}
156
157	/*
158	 * Send to kernel...
159	 */
160	if ((n = sendmsg(so, &msg, MSG_EOR)) < 0)
161		syslog(LOG_WARNING, "send: %m");
162#ifdef DEBUG
163	fprintf(stderr, "sent %d bytes\n", n);
164#endif
165	sleep(1);	/*XXX*/
166#ifdef notdef
167	if (shutdown(so, 2) < 0)
168		syslog(LOG_WARNING, "shutdown: %m");
169#endif
170	/*
171	 * Throw away the open file descriptor and control
172	 * message buffer.
173	 */
174	if (fd >= 0)
175		(void) close(fd);
176	if (ctl != NULL)
177		free(ctl);
178}
179
180void
181activate(qelem *q, int so)
182{
183	struct portal_cred pcred;
184	char key[MAXPATHLEN+1];
185	int error;
186	char **v;
187	int fd = -1;
188
189	/*
190	 * Read the key from the socket
191	 */
192	error = get_request(so, &pcred, key, sizeof(key));
193	if (error) {
194		syslog(LOG_WARNING, "activate: recvmsg: %m");
195		goto drop;
196	}
197
198#ifdef DEBUG
199	fprintf(stderr, "lookup key %s\n", key);
200#endif
201
202	/*
203	 * Find a match in the configuration file
204	 */
205	v = conf_match(q, key);
206
207	/*
208	 * If a match existed, then find an appropriate portal
209	 * otherwise simply return ENOENT.
210	 */
211	if (v) {
212		error = activate_argv(&pcred, key, v, &fd);
213		if (error)
214			fd = -1;
215		else if (fd < 0)
216			error = -1;
217	} else
218		error = ENOENT;
219
220	if (error >= 0)
221		send_reply(so, fd, error);
222
223drop:;
224	close(so);
225}
226