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237 lines
5.0 KiB
C
237 lines
5.0 KiB
C
/*
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* main.c
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*
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* Copyright (c) 2004 Maksim Yevmenkin <m_evmenkin@yahoo.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: main.c,v 1.8 2004/01/13 19:31:54 max Exp $
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* $FreeBSD$
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*/
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#include <sys/select.h>
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#define L2CAP_SOCKET_CHECKED
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#include <bluetooth.h>
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#include <errno.h>
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#include <grp.h>
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#include <pwd.h>
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#include <signal.h>
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#include <sdp.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "log.h"
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#include "server.h"
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <sys/queue.h>
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#include "profile.h"
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#include "provider.h"
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#define SDPD "sdpd"
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static int32_t drop_root (char const *user, char const *group);
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static void sighandler (int32_t s);
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static void usage (void);
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static int32_t done;
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/*
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* Bluetooth Service Discovery Procotol (SDP) daemon
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*/
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int
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main(int argc, char *argv[])
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{
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server_t server;
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char const *control = SDP_LOCAL_PATH;
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char const *user = "nobody", *group = "nobody";
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int32_t detach = 1, opt;
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struct sigaction sa;
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while ((opt = getopt(argc, argv, "c:dg:hu:")) != -1) {
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switch (opt) {
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case 'c': /* control */
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control = optarg;
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break;
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case 'd': /* do not detach */
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detach = 0;
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break;
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case 'g': /* group */
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group = optarg;
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break;
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case 'u': /* user */
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user = optarg;
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break;
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case 'h':
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default:
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usage();
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/* NOT REACHED */
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}
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}
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log_open(SDPD, !detach);
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/* Become daemon if required */
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if (detach && daemon(0, 0) < 0) {
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log_crit("Could not become daemon. %s (%d)",
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strerror(errno), errno);
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exit(1);
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}
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/* Set signal handlers */
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = sighandler;
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if (sigaction(SIGTERM, &sa, NULL) < 0 ||
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sigaction(SIGHUP, &sa, NULL) < 0 ||
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sigaction(SIGINT, &sa, NULL) < 0) {
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log_crit("Could not install signal handlers. %s (%d)",
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strerror(errno), errno);
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exit(1);
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}
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sa.sa_handler = SIG_IGN;
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if (sigaction(SIGPIPE, &sa, NULL) < 0) {
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log_crit("Could not install signal handlers. %s (%d)",
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strerror(errno), errno);
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exit(1);
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}
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/* Initialize server */
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if (server_init(&server, control) < 0)
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exit(1);
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if ((user != NULL || group != NULL) && drop_root(user, group) < 0)
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exit(1);
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for (done = 0; !done; ) {
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if (server_do(&server) != 0)
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done ++;
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}
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server_shutdown(&server);
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log_close();
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return (0);
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}
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/*
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* Drop root
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*/
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static int32_t
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drop_root(char const *user, char const *group)
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{
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int uid, gid;
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char *ep;
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if ((uid = getuid()) != 0) {
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log_notice("Cannot set uid/gid. Not a superuser");
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return (0); /* dont do anything unless root */
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}
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gid = getgid();
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if (user != NULL) {
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uid = strtol(user, &ep, 10);
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if (*ep != '\0') {
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struct passwd *pwd = getpwnam(user);
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if (pwd == NULL) {
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log_err("Could not find passwd entry for " \
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"user %s", user);
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return (-1);
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}
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uid = pwd->pw_uid;
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}
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}
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if (group != NULL) {
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gid = strtol(group, &ep, 10);
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if (*ep != '\0') {
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struct group *grp = getgrnam(group);
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if (grp == NULL) {
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log_err("Could not find group entry for " \
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"group %s", group);
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return (-1);
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}
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gid = grp->gr_gid;
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}
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}
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if (setgid(gid) < 0) {
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log_err("Could not setgid(%s). %s (%d)",
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group, strerror(errno), errno);
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return (-1);
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}
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if (setuid(uid) < 0) {
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log_err("Could not setuid(%s). %s (%d)",
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user, strerror(errno), errno);
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return (-1);
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}
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return (0);
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}
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/*
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* Signal handler
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*/
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static void
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sighandler(int32_t s)
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{
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log_notice("Got signal %d. Total number of signals received %d",
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s, ++ done);
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}
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/*
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* Display usage information and quit
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*/
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static void
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usage(void)
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{
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fprintf(stderr,
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"Usage: %s [options]\n" \
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"Where options are:\n" \
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" -c specify control socket name (default %s)\n" \
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" -d do not detach (run in foreground)\n" \
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" -g grp specify group\n" \
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" -h display usage and exit\n" \
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" -u usr specify user\n",
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SDPD, SDP_LOCAL_PATH);
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exit(255);
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}
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