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