1/*	$NetBSD: run.c,v 1.14 2016/04/04 15:52:56 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2015 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31#ifdef HAVE_CONFIG_H
32#include "config.h"
33#endif
34
35#include <sys/cdefs.h>
36__RCSID("$NetBSD: run.c,v 1.14 2016/04/04 15:52:56 christos Exp $");
37
38#include <stdio.h>
39#ifdef HAVE_LIBUTIL_H
40#include <libutil.h>
41#endif
42#ifdef HAVE_UTIL_H
43#include <util.h>
44#endif
45#include <stdarg.h>
46#include <limits.h>
47#include <stdlib.h>
48#include <inttypes.h>
49#include <syslog.h>
50#include <string.h>
51#include <netinet/in.h>
52#include <net/if.h>
53
54#include "run.h"
55#include "conf.h"
56#include "internal.h"
57#include "support.h"
58
59extern char **environ;
60
61static char *
62run(const char *cmd, const char *name, ...)
63{
64	const char *argv[20];
65	size_t i;
66	va_list ap;
67	FILE *fp;
68	char buf[10240], *res;
69
70	argv[0] = "control";
71	argv[1] = cmd;
72	argv[2] = name;
73	va_start(ap, name);
74	for (i = 3; i < __arraycount(argv) &&
75	    (argv[i] = va_arg(ap, char *)) != NULL; i++)
76		continue;
77	va_end(ap);
78
79	if (debug) {
80		size_t z;
81		int r;
82
83		r = snprintf(buf, sizeof(buf), "run %s [", controlprog);
84		if (r == -1 || (z = (size_t)r) >= sizeof(buf))
85			z = sizeof(buf);
86		for (i = 0; argv[i]; i++) {
87			r = snprintf(buf + z, sizeof(buf) - z, "%s%s",
88			    argv[i], argv[i + 1] ? " " : "");
89			if (r == -1 || (z += (size_t)r) >= sizeof(buf))
90				z = sizeof(buf);
91		}
92		(*lfun)(LOG_DEBUG, "%s]", buf);
93	}
94
95	fp = popenve(controlprog, __UNCONST(argv), environ, "r");
96	if (fp == NULL) {
97		(*lfun)(LOG_ERR, "popen %s failed (%m)", controlprog);
98		return NULL;
99	}
100	if (fgets(buf, sizeof(buf), fp) != NULL)
101		res = strdup(buf);
102	else
103		res = NULL;
104	pclose(fp);
105	if (debug)
106		(*lfun)(LOG_DEBUG, "%s returns %s", cmd, res);
107	return res;
108}
109
110void
111run_flush(const struct conf *c)
112{
113	free(run("flush", c->c_name, NULL));
114}
115
116int
117run_change(const char *how, const struct conf *c, char *id, size_t len)
118{
119	const char *prname;
120	char poname[64], adname[128], maskname[32], *rv;
121	size_t off;
122
123	switch (c->c_proto) {
124	case -1:
125		prname = "";
126		break;
127	case IPPROTO_TCP:
128		prname = "tcp";
129		break;
130	case IPPROTO_UDP:
131		prname = "udp";
132		break;
133	default:
134		(*lfun)(LOG_ERR, "%s: bad protocol %d", __func__, c->c_proto);
135		return -1;
136	}
137
138	if (c->c_port != -1)
139		snprintf(poname, sizeof(poname), "%d", c->c_port);
140	else
141		poname[0] = '\0';
142
143	snprintf(maskname, sizeof(maskname), "%d", c->c_lmask);
144	sockaddr_snprintf(adname, sizeof(adname), "%a", (const void *)&c->c_ss);
145
146	rv = run(how, c->c_name, prname, adname, maskname, poname, id, NULL);
147	if (rv == NULL)
148		return -1;
149	if (len != 0) {
150		rv[strcspn(rv, "\n")] = '\0';
151		off = strncmp(rv, "OK ", 3) == 0 ? 3 : 0;
152		strlcpy(id, rv + off, len);
153	}
154	free(rv);
155	return 0;
156}
157