usr.sbin/bluetooth/sdpd/main.c

   1 /*
   2  * main.c
   3  *
   4  * Copyright (c) 2004 Maksim Yevmenkin <m_evmenkin@yahoo.com>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $Id: main.c,v 1.8 2004/01/13 19:31:54 max Exp $
  29  * $FreeBSD$
  30  */
  31
  32 #include <sys/select.h>
  33 #include <bluetooth.h>
  34 #include <errno.h>
  35 #include <grp.h>
  36 #include <pwd.h>
  37 #include <signal.h>
  38 #include <sdp.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43 #include "log.h"
  44 #include "server.h"
  45
  46 #include <netinet/in.h>
  47 #include <arpa/inet.h>
  48 #include <sys/queue.h>
  49 #include "profile.h"
  50 #include "provider.h"
  51
  52 #define SDPD                    "sdpd"
  53
  54 static int32_t  drop_root       (char const *user, char const *group);
  55 static void     sighandler      (int32_t s);
  56 static void     usage           (void);
  57
  58 static int32_t  done;
  59
  60 /*
  61  * Bluetooth Service Discovery Procotol (SDP) daemon
  62  */
  63
  64 int
  65 main(int argc, char *argv[])
  66 {
  67         server_t                 server;
  68         char const              *control = SDP_LOCAL_PATH;
  69         char const              *user = "nobody", *group = "nobody";
  70         int32_t                  detach = 1, opt;
  71         struct sigaction         sa;
  72
  73         while ((opt = getopt(argc, argv, "c:dg:hu:")) != -1) {
  74                 switch (opt) {
  75                 case 'c': /* control */
  76                         control = optarg;
  77                         break;
  78
  79                 case 'd': /* do not detach */
  80                         detach = 0;
  81                         break;
  82
  83                 case 'g': /* group */
  84                         group = optarg;
  85                         break;
  86
  87                 case 'u': /* user */
  88                         user = optarg;
  89                         break;
  90
  91                 case 'h':
  92                 default:
  93                         usage();
  94                         /* NOT REACHED */
  95                 }
  96         }
  97
  98         log_open(SDPD, !detach);
  99
 100         /* Become daemon if required */
 101         if (detach && daemon(0, 0) < 0) {
 102                 log_crit("Could not become daemon. %s (%d)",
 103                         strerror(errno), errno);
 104                 exit(1);
 105         }
 106
 107         /* Set signal handlers */
 108         memset(&sa, 0, sizeof(sa));
 109         sa.sa_handler = sighandler;
 110
 111         if (sigaction(SIGTERM, &sa, NULL) < 0 ||
 112             sigaction(SIGHUP,  &sa, NULL) < 0 ||
 113             sigaction(SIGINT,  &sa, NULL) < 0) {
 114                 log_crit("Could not install signal handlers. %s (%d)",
 115                         strerror(errno), errno);
 116                 exit(1);
 117         }
 118
 119         sa.sa_handler = SIG_IGN;
 120         if (sigaction(SIGPIPE, &sa, NULL) < 0) {
 121                 log_crit("Could not install signal handlers. %s (%d)",
 122                         strerror(errno), errno);
 123                 exit(1);
 124         }
 125
 126         /* Initialize server */
 127         if (server_init(&server, control) < 0)
 128                 exit(1);
 129
 130         if ((user != NULL || group != NULL) && drop_root(user, group) < 0)
 131                 exit(1);
 132
 133         for (done = 0; !done; ) {
 134                 if (server_do(&server) != 0)
 135                         done ++;
 136         }
 137
 138         server_shutdown(&server);
 139         log_close();
 140
 141         return (0);
 142 }
 143
 144 /*
 145  * Drop root
 146  */
 147
 148 static int32_t
 149 drop_root(char const *user, char const *group)
 150 {
 151         int      uid, gid;
 152         char    *ep;
 153
 154         if ((uid = getuid()) != 0) {
 155                 log_notice("Cannot set uid/gid. Not a superuser");
 156                 return (0); /* dont do anything unless root */
 157         }
 158
 159         gid = getgid();
 160
 161         if (user != NULL) {
 162                 uid = strtol(user, &ep, 10);
 163                 if (*ep != '\0') {
 164                         struct passwd   *pwd = getpwnam(user);
 165
 166                         if (pwd == NULL) {
 167                                 log_err("Could not find passwd entry for " \
 168                                         "user %s", user);
 169                                 return (-1);
 170                         }
 171
 172                         uid = pwd->pw_uid;
 173                 }
 174         }
 175
 176         if (group != NULL) {
 177                 gid = strtol(group, &ep, 10);
 178                 if (*ep != '\0') {
 179                         struct group    *grp = getgrnam(group);
 180
 181                         if (grp == NULL) {
 182                                 log_err("Could not find group entry for " \
 183                                         "group %s", group);
 184                                 return (-1);
 185                         }
 186
 187                         gid = grp->gr_gid;
 188                 }
 189         }
 190
 191         if (setgid(gid) < 0) {
 192                 log_err("Could not setgid(%s). %s (%d)",
 193                         group, strerror(errno), errno);
 194                 return (-1);
 195         }
 196
 197         if (setuid(uid) < 0) {
 198                 log_err("Could not setuid(%s). %s (%d)",
 199                         user, strerror(errno), errno);
 200                 return (-1);
 201         }
 202
 203         return (0);
 204 }
 205
 206 /*
 207  * Signal handler
 208  */
 209
 210 static void
 211 sighandler(int32_t s)
 212 {
 213         log_notice("Got signal %d. Total number of signals received %d",
 214                 s, ++ done);
 215 }
 216
 217 /*
 218  * Display usage information and quit
 219  */
 220
 221 static void
 222 usage(void)
 223 {
 224         fprintf(stderr,
 225 "Usage: %s [options]\n" \
 226 "Where options are:\n" \
 227 "       -c      specify control socket name (default %s)\n" \
 228 "       -d      do not detach (run in foreground)\n" \
 229 "       -g grp  specify group\n" \
 230 "       -h      display usage and exit\n" \
 231 "       -u usr  specify user\n",
 232                 SDPD, SDP_LOCAL_PATH);
 233         exit(255);
 234 }
 235