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 59 extern char **environ; 60 61 static char * 62 run(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 } 109 110 void 111 run_flush(const struct conf *c) 112 { 113 free(run("flush", c->c_name, NULL)); 114 } 115 116 int 117 run_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