1 /*- 2 * main.c 3 * 4 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 1.8 2004/01/13 19:31:54 max Exp $ 31 * $FreeBSD$ 32 */ 33 34 #include <sys/select.h> 35 #define L2CAP_SOCKET_CHECKED 36 #include <bluetooth.h> 37 #include <errno.h> 38 #include <grp.h> 39 #include <pwd.h> 40 #include <signal.h> 41 #include <sdp.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include "log.h" 47 #include "server.h" 48 49 #include <netinet/in.h> 50 #include <arpa/inet.h> 51 #include <sys/queue.h> 52 #include "profile.h" 53 #include "provider.h" 54 55 #define SDPD "sdpd" 56 57 static int32_t drop_root (char const *user, char const *group); 58 static void sighandler (int32_t s); 59 static void usage (void); 60 61 static int32_t done; 62 63 /* 64 * Bluetooth Service Discovery Procotol (SDP) daemon 65 */ 66 67 int 68 main(int argc, char *argv[]) 69 { 70 server_t server; 71 char const *control = SDP_LOCAL_PATH; 72 char const *user = "nobody", *group = "nobody"; 73 int32_t detach = 1, opt; 74 struct sigaction sa; 75 76 while ((opt = getopt(argc, argv, "c:dg:hu:")) != -1) { 77 switch (opt) { 78 case 'c': /* control */ 79 control = optarg; 80 break; 81 82 case 'd': /* do not detach */ 83 detach = 0; 84 break; 85 86 case 'g': /* group */ 87 group = optarg; 88 break; 89 90 case 'u': /* user */ 91 user = optarg; 92 break; 93 94 case 'h': 95 default: 96 usage(); 97 /* NOT REACHED */ 98 } 99 } 100 101 log_open(SDPD, !detach); 102 103 /* Become daemon if required */ 104 if (detach && daemon(0, 0) < 0) { 105 log_crit("Could not become daemon. %s (%d)", 106 strerror(errno), errno); 107 exit(1); 108 } 109 110 /* Set signal handlers */ 111 memset(&sa, 0, sizeof(sa)); 112 sa.sa_handler = sighandler; 113 114 if (sigaction(SIGTERM, &sa, NULL) < 0 || 115 sigaction(SIGHUP, &sa, NULL) < 0 || 116 sigaction(SIGINT, &sa, NULL) < 0) { 117 log_crit("Could not install signal handlers. %s (%d)", 118 strerror(errno), errno); 119 exit(1); 120 } 121 122 sa.sa_handler = SIG_IGN; 123 if (sigaction(SIGPIPE, &sa, NULL) < 0) { 124 log_crit("Could not install signal handlers. %s (%d)", 125 strerror(errno), errno); 126 exit(1); 127 } 128 129 /* Initialize server */ 130 if (server_init(&server, control) < 0) 131 exit(1); 132 133 if ((user != NULL || group != NULL) && drop_root(user, group) < 0) 134 exit(1); 135 136 for (done = 0; !done; ) { 137 if (server_do(&server) != 0) 138 done ++; 139 } 140 141 server_shutdown(&server); 142 log_close(); 143 144 return (0); 145 } 146 147 /* 148 * Drop root 149 */ 150 151 static int32_t 152 drop_root(char const *user, char const *group) 153 { 154 int uid, gid; 155 char *ep; 156 157 if ((uid = getuid()) != 0) { 158 log_notice("Cannot set uid/gid. Not a superuser"); 159 return (0); /* dont do anything unless root */ 160 } 161 162 gid = getgid(); 163 164 if (user != NULL) { 165 uid = strtol(user, &ep, 10); 166 if (*ep != '\0') { 167 struct passwd *pwd = getpwnam(user); 168 169 if (pwd == NULL) { 170 log_err("Could not find passwd entry for " \ 171 "user %s", user); 172 return (-1); 173 } 174 175 uid = pwd->pw_uid; 176 } 177 } 178 179 if (group != NULL) { 180 gid = strtol(group, &ep, 10); 181 if (*ep != '\0') { 182 struct group *grp = getgrnam(group); 183 184 if (grp == NULL) { 185 log_err("Could not find group entry for " \ 186 "group %s", group); 187 return (-1); 188 } 189 190 gid = grp->gr_gid; 191 } 192 } 193 194 if (setgid(gid) < 0) { 195 log_err("Could not setgid(%s). %s (%d)", 196 group, strerror(errno), errno); 197 return (-1); 198 } 199 200 if (setuid(uid) < 0) { 201 log_err("Could not setuid(%s). %s (%d)", 202 user, strerror(errno), errno); 203 return (-1); 204 } 205 206 return (0); 207 } 208 209 /* 210 * Signal handler 211 */ 212 213 static void 214 sighandler(int32_t s) 215 { 216 log_notice("Got signal %d. Total number of signals received %d", 217 s, ++ done); 218 } 219 220 /* 221 * Display usage information and quit 222 */ 223 224 static void 225 usage(void) 226 { 227 fprintf(stderr, 228 "Usage: %s [options]\n" \ 229 "Where options are:\n" \ 230 " -c specify control socket name (default %s)\n" \ 231 " -d do not detach (run in foreground)\n" \ 232 " -g grp specify group\n" \ 233 " -h display usage and exit\n" \ 234 " -u usr specify user\n", 235 SDPD, SDP_LOCAL_PATH); 236 exit(255); 237 } 238 239