1 /* $NetBSD: main.c,v 1.4 2008/07/21 13:36:59 lukem Exp $ */ 2 3 /* 4 * main.c 5 * 6 * Copyright (c) 2004 Maksim Yevmenkin <m_evmenkin@yahoo.com> 7 * All rights reserved. 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 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $Id: main.c,v 1.4 2008/07/21 13:36:59 lukem Exp $ 31 * $FreeBSD: src/usr.sbin/bluetooth/sdpd/main.c,v 1.1 2004/01/20 20:48:26 emax Exp $ 32 */ 33 34 #include <sys/cdefs.h> 35 __COPYRIGHT("@(#) Copyright (c) 2006 Itronix, Inc.\ 36 Copyright (c) 2004 Maksim Yevmenkin m_evmenkin@yahoo.com.\ 37 All rights reserved."); 38 __RCSID("$NetBSD: main.c,v 1.4 2008/07/21 13:36:59 lukem Exp $"); 39 40 #include <sys/select.h> 41 #include <bluetooth.h> 42 #include <errno.h> 43 #include <grp.h> 44 #include <pwd.h> 45 #include <signal.h> 46 #include <sdp.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <unistd.h> 51 #include "log.h" 52 #include "server.h" 53 54 #include <netinet/in.h> 55 #include <arpa/inet.h> 56 #include <sys/queue.h> 57 #include "profile.h" 58 #include "provider.h" 59 60 #define SDPD "sdpd" 61 62 static int32_t drop_root (char const *user, char const *group); 63 static void sighandler (int32_t s); 64 static void usage (void); 65 66 static int32_t done; 67 68 /* 69 * Bluetooth Service Discovery Procotol (SDP) daemon 70 */ 71 72 int 73 main(int argc, char *argv[]) 74 { 75 server_t server; 76 char const *control = SDP_LOCAL_PATH; 77 char const *user = "_sdpd", *group = "_sdpd"; 78 char const *sgroup = NULL; 79 int32_t detach = 1, opt; 80 struct sigaction sa; 81 82 while ((opt = getopt(argc, argv, "c:dG:g:hu:")) != -1) { 83 switch (opt) { 84 case 'c': /* control */ 85 control = optarg; 86 break; 87 88 case 'd': /* do not detach */ 89 detach = 0; 90 break; 91 92 case 'G': /* super group */ 93 sgroup = optarg; 94 break; 95 96 case 'g': /* group */ 97 group = optarg; 98 break; 99 100 case 'u': /* user */ 101 user = optarg; 102 break; 103 104 case 'h': 105 default: 106 usage(); 107 /* NOT REACHED */ 108 } 109 } 110 111 log_open(SDPD, !detach); 112 113 /* Become daemon if required */ 114 if (detach && daemon(0, 0) < 0) { 115 log_crit("Could not become daemon. %s (%d)", 116 strerror(errno), errno); 117 exit(1); 118 } 119 120 /* Set signal handlers */ 121 memset(&sa, 0, sizeof(sa)); 122 sa.sa_handler = sighandler; 123 124 if (sigaction(SIGTERM, &sa, NULL) < 0 || 125 sigaction(SIGHUP, &sa, NULL) < 0 || 126 sigaction(SIGINT, &sa, NULL) < 0) { 127 log_crit("Could not install signal handlers. %s (%d)", 128 strerror(errno), errno); 129 exit(1); 130 } 131 132 sa.sa_handler = SIG_IGN; 133 if (sigaction(SIGPIPE, &sa, NULL) < 0) { 134 log_crit("Could not install signal handlers. %s (%d)", 135 strerror(errno), errno); 136 exit(1); 137 } 138 139 /* Initialize server */ 140 if (server_init(&server, control, sgroup) < 0) 141 exit(1); 142 143 if ((user != NULL || group != NULL) && drop_root(user, group) < 0) 144 exit(1); 145 146 for (done = 0; !done; ) { 147 if (server_do(&server) != 0) 148 done ++; 149 } 150 151 server_shutdown(&server); 152 log_close(); 153 154 return (0); 155 } 156 157 /* 158 * Drop root 159 */ 160 161 static int32_t 162 drop_root(char const *user, char const *group) 163 { 164 int uid, gid; 165 char *ep; 166 167 if ((uid = getuid()) != 0) { 168 log_notice("Cannot set uid/gid. Not a superuser"); 169 return (0); /* dont do anything unless root */ 170 } 171 172 gid = getgid(); 173 174 if (user != NULL) { 175 uid = strtol(user, &ep, 10); 176 if (*ep != '\0') { 177 struct passwd *pwd = getpwnam(user); 178 179 if (pwd == NULL) { 180 log_err("Could not find passwd entry for " \ 181 "user %s", user); 182 return (-1); 183 } 184 185 uid = pwd->pw_uid; 186 } 187 } 188 189 if (group != NULL) { 190 gid = strtol(group, &ep, 10); 191 if (*ep != '\0') { 192 struct group *grp = getgrnam(group); 193 194 if (grp == NULL) { 195 log_err("Could not find group entry for " \ 196 "group %s", group); 197 return (-1); 198 } 199 200 gid = grp->gr_gid; 201 } 202 } 203 204 if (setgid(gid) < 0) { 205 log_err("Could not setgid(%s). %s (%d)", 206 group, strerror(errno), errno); 207 return (-1); 208 } 209 210 if (setuid(uid) < 0) { 211 log_err("Could not setuid(%s). %s (%d)", 212 user, strerror(errno), errno); 213 return (-1); 214 } 215 216 return (0); 217 } 218 219 /* 220 * Signal handler 221 */ 222 223 static void 224 sighandler(int32_t s) 225 { 226 log_notice("Got signal %d. Total number of signals received %d", 227 s, ++ done); 228 } 229 230 /* 231 * Display usage information and quit 232 */ 233 234 static void 235 usage(void) 236 { 237 fprintf(stderr, 238 "Usage: %s [options]\n" \ 239 "Where options are:\n" \ 240 " -c specify control socket name (default %s)\n" \ 241 " -d do not detach (run in foreground)\n" \ 242 " -G grp allow privileges to group\n" \ 243 " -g grp specify group\n" \ 244 " -h display usage and exit\n" \ 245 " -u usr specify user\n", 246 SDPD, SDP_LOCAL_PATH); 247 exit(255); 248 } 249