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      1 /*	$NetBSD: run.c,v 1.4 2026/02/07 14:29:09 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 #ifdef HAVE_SYS_CDEFS_H
     36 #include <sys/cdefs.h>
     37 #endif
     38 __RCSID("$NetBSD: run.c,v 1.4 2026/02/07 14:29:09 christos Exp $");
     39 
     40 #include <stdio.h>
     41 #ifdef HAVE_LIBUTIL_H
     42 #include <libutil.h>
     43 #endif
     44 #ifdef HAVE_UTIL_H
     45 #include <util.h>
     46 #endif
     47 #include <stdarg.h>
     48 #include <limits.h>
     49 #include <stdlib.h>
     50 #include <inttypes.h>
     51 #include <syslog.h>
     52 #include <string.h>
     53 #include <netinet/in.h>
     54 #include <net/if.h>
     55 
     56 #include "run.h"
     57 #include "conf.h"
     58 #include "internal.h"
     59 #include "support.h"
     60 
     61 extern char **environ;
     62 
     63 static char *
     64 run(const char *cmd, const char *name, ...)
     65 {
     66 	const char *argv[20];
     67 	size_t i, len;
     68 	va_list ap;
     69 	FILE *fp;
     70 	char *line, *res;
     71 
     72 	argv[0] = "control";
     73 	argv[1] = cmd;
     74 	argv[2] = name;
     75 	va_start(ap, name);
     76 	for (i = 3; i < __arraycount(argv) &&
     77 	    (argv[i] = va_arg(ap, char *)) != NULL; i++)
     78 		continue;
     79 	va_end(ap);
     80 
     81 	if (debug) {
     82 		char buf[2048];
     83 		size_t z;
     84 		int r;
     85 
     86 		r = snprintf(buf, sizeof(buf), "run %s [", controlprog);
     87 		if (r == -1 || (z = (size_t)r) >= sizeof(buf))
     88 			z = sizeof(buf);
     89 		for (i = 0; argv[i]; i++) {
     90 			r = snprintf(buf + z, sizeof(buf) - z, "%s%s",
     91 			    argv[i], argv[i + 1] ? " " : "");
     92 			if (r == -1 || (z += (size_t)r) >= sizeof(buf))
     93 				z = sizeof(buf);
     94 		}
     95 		(*lfun)(LOG_DEBUG, "%s]", buf);
     96 	}
     97 
     98 	fp = popenve(controlprog, __UNCONST(argv), environ, "r");
     99 	if (fp == NULL) {
    100 		(*lfun)(LOG_ERR, "popen %s failed (%m)", controlprog);
    101 		return NULL;
    102 	}
    103 	line = res = NULL;
    104 	len = 0;
    105 	if (getline(&line, &len, fp) >= 0)
    106 		res = line;
    107 	pclose(fp);
    108 	if (debug)
    109 		(*lfun)(LOG_DEBUG, "%s returns %s", cmd, res);
    110 	return res;
    111 }
    112 
    113 void
    114 run_flush(const struct conf *c)
    115 {
    116 	free(run("flush", c->c_name, NULL));
    117 }
    118 
    119 int
    120 run_change(const char *how, const struct conf *c, char *id, size_t len)
    121 {
    122 	const char *prname;
    123 	char poname[64], adname[128], maskname[32], *rv;
    124 	size_t off;
    125 
    126 	switch (c->c_proto) {
    127 	case -1:
    128 		prname = "";
    129 		break;
    130 	case IPPROTO_TCP:
    131 		prname = "tcp";
    132 		break;
    133 	case IPPROTO_UDP:
    134 		prname = "udp";
    135 		break;
    136 	default:
    137 		(*lfun)(LOG_ERR, "%s: bad protocol %d (line %zu)", __func__,
    138 		     c->c_proto, c->c_lineno);
    139 		return -1;
    140 	}
    141 
    142 	if (c->c_port != -1)
    143 		snprintf(poname, sizeof(poname), "%d", c->c_port);
    144 	else
    145 		poname[0] = '\0';
    146 
    147 	snprintf(maskname, sizeof(maskname), "%d", c->c_lmask);
    148 	sockaddr_snprintf(adname, sizeof(adname), "%a", (const void *)&c->c_ss);
    149 
    150 	rv = run(how, c->c_name, prname, adname, maskname, poname, id, NULL);
    151 	if (rv == NULL)
    152 		return -1;
    153 	if (len != 0) {
    154 		rv[strcspn(rv, "\n")] = '\0';
    155 		off = strncmp(rv, "OK ", 3) == 0 ? 3 : 0;
    156 		strlcpy(id, rv + off, len);
    157 	}
    158 	free(rv);
    159 	return 0;
    160 }
    161