/* $NetBSD: main.c,v 1.10 2019/02/04 04:56:35 mrg Exp $ */
/*-
* Copyright (c) 2009 The NetBSD Foundation, Inc.
* Copyright (c) 2004 Maksim Yevmenkin <
[email protected]>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: src/usr.sbin/bluetooth/sdpd/main.c,v 1.1 2004/01/20 20:48:26 emax Exp $
*/
#include <sys/cdefs.h>
__COPYRIGHT("@(#) Copyright (c) 2009 The NetBSD Foundation, Inc.\
Copyright (c) 2006 Itronix, Inc.\
Copyright (c) 2004 Maksim Yevmenkin
[email protected].\
All rights reserved.");
__RCSID("$NetBSD: main.c,v 1.10 2019/02/04 04:56:35 mrg Exp $");
#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "sdpd.h"
#define SDPD "sdpd"
static bool drop_root (char const *user, char const *group);
static void sighandler (int s);
__dead static void usage (void);
static unsigned done;
/*
* Bluetooth Service Discovery Procotol (SDP) daemon
*/
int
main(int argc, char *argv[])
{
server_t server;
char const *control = SDP_LOCAL_PATH;
char const *user = "_sdpd", *group = "_sdpd";
char const *sgroup = NULL;
int opt;
bool detach = true;
struct sigaction sa;
while ((opt = getopt(argc, argv, "c:dG:g:hu:")) != -1) {
switch (opt) {
case 'c': /* control */
control = optarg;
break;
case 'd': /* do not detach */
detach = false;
break;
case 'G': /* super group */
sgroup = optarg;
break;
case 'g': /* group */
group = optarg;
break;
case 'u': /* user */
user = optarg;
break;
case 'h':
default:
usage();
/* NOT REACHED */
}
}
log_open(SDPD, !detach);
/* Become daemon if required */
if (detach && daemon(0, 0) < 0) {
log_crit("Could not become daemon. %s (%d)",
strerror(errno), errno);
exit(EXIT_FAILURE);
}
/* Set signal handlers */
memset(&sa, 0, sizeof(sa));
sa.sa_handler = sighandler;
if (sigaction(SIGTERM, &sa, NULL) < 0
|| sigaction(SIGHUP, &sa, NULL) < 0
|| sigaction(SIGINT, &sa, NULL) < 0) {
log_crit("Could not install signal handlers. %s (%d)",
strerror(errno), errno);
exit(EXIT_FAILURE);
}
sa.sa_handler = SIG_IGN;
if (sigaction(SIGPIPE, &sa, NULL) < 0) {
log_crit("Could not install signal handlers. %s (%d)",
strerror(errno), errno);
exit(EXIT_FAILURE);
}
/* Initialize server */
if (!server_init(&server, control, sgroup))
exit(EXIT_FAILURE);
if ((user != NULL || group != NULL) && !drop_root(user, group))
exit(EXIT_FAILURE);
for (done = 0; !done; ) {
if (!server_do(&server))
done++;
}
server_shutdown(&server);
log_close();
exit(EXIT_SUCCESS);
}
/*
* Drop root
*/
static bool
drop_root(char const *user, char const *group)
{
gid_t gid;
uid_t uid;
char *ep;
if ((uid = getuid()) != 0) {
log_notice("Cannot set uid/gid. Not a superuser");
return true; /* dont do anything unless root */
}
gid = getgid();
if (user != NULL) {
uid = strtol(user, &ep, 10);
if (*ep != '\0') {
struct passwd *pwd = getpwnam(user);
if (pwd == NULL) {
log_err("No passwd entry for user %s", user);
return false;
}
uid = pwd->pw_uid;
}
}
if (group != NULL) {
gid = strtol(group, &ep, 10);
if (*ep != '\0') {
struct group *grp = getgrnam(group);
if (grp == NULL) {
log_err("No group entry for group %s", group);
return false;
}
gid = grp->gr_gid;
}
}
if (setgid(gid) < 0) {
log_err("Could not setgid(%s). %s (%d)", group,
strerror(errno), errno);
return false;
}
if (setgroups(0, NULL) < 0) {
log_err("Could not setgroups(0). %s (%d)",
strerror(errno), errno);
return false;
}
if (setuid(uid) < 0) {
log_err("Could not setuid(%s). %s (%d)", user,
strerror(errno), errno);
return false;
}
return true;
}
/*
* Signal handler
*/
static void
sighandler(int s)
{
log_notice("Got signal %d. Total number of signals received %d",
s, ++done);
}
/*
* Display usage information and quit
*/
static void
usage(void)
{
fprintf(stderr, "Usage: %s [options]\n"
"Where options are:\n"
"\t-c specify control socket name (default %s)\n"
"\t-d do not detach (run in foreground)\n"
"\t-G grp allow privileges to group\n"
"\t-g grp specify group\n"
"\t-h display usage and exit\n"
"\t-u usr specify user\n"
"", SDPD, SDP_LOCAL_PATH);
exit(EXIT_FAILURE);
}
