source: unix.c @ cd63d58

Last change on this file since cd63d58 was cd63d58, checked in by Wilmer van der Gaast <wilmer@…>, at 2008-06-29T12:47:39Z

Now using an environment variable instead of a flag to pass state info when
restarting the ForkDaemon. Preparing for a proper fallback when execv()
fails. (Bug #425)

  • Property mode set to 100644
File size: 6.0 KB
Line 
1  /********************************************************************\
2  * BitlBee -- An IRC to other IM-networks gateway                     *
3  *                                                                    *
4  * Copyright 2002-2004 Wilmer van der Gaast and others                *
5  \********************************************************************/
6
7/* Main file (Unix specific part)                                       */
8
9/*
10  This program is free software; you can redistribute it and/or modify
11  it under the terms of the GNU General Public License as published by
12  the Free Software Foundation; either version 2 of the License, or
13  (at your option) any later version.
14
15  This program is distributed in the hope that it will be useful,
16  but WITHOUT ANY WARRANTY; without even the implied warranty of
17  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  GNU General Public License for more details.
19
20  You should have received a copy of the GNU General Public License with
21  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
22  if not, write to the Free Software Foundation, Inc., 59 Temple Place,
23  Suite 330, Boston, MA  02111-1307  USA
24*/
25
26#include "bitlbee.h"
27#include "commands.h"
28#include "crypting.h"
29#include "protocols/nogaim.h"
30#include "help.h"
31#include "ipc.h"
32#include <signal.h>
33#include <unistd.h>
34#include <sys/time.h>
35#include <sys/wait.h>
36#include <pwd.h>
37
38global_t global;        /* Against global namespace pollution */
39
40static void sighandler( int signal );
41
42int main( int argc, char *argv[] )
43{
44        int i = 0;
45        char *old_cwd = NULL;
46        struct sigaction sig, old;
47       
48        log_init();
49        global.conf_file = g_strdup( CONF_FILE_DEF );
50        global.conf = conf_load( argc, argv );
51        if( global.conf == NULL )
52                return( 1 );
53       
54        b_main_init();
55        nogaim_init();
56       
57        srand( time( NULL ) ^ getpid() );
58        global.helpfile = g_strdup( HELP_FILE );
59       
60        if( global.conf->runmode == RUNMODE_INETD )
61        {
62                i = bitlbee_inetd_init();
63                log_message( LOGLVL_INFO, "Bitlbee %s starting in inetd mode.", BITLBEE_VERSION );
64
65        }
66        else if( global.conf->runmode == RUNMODE_DAEMON )
67        {
68                i = bitlbee_daemon_init();
69                log_message( LOGLVL_INFO, "Bitlbee %s starting in daemon mode.", BITLBEE_VERSION );
70        }
71        else if( global.conf->runmode == RUNMODE_FORKDAEMON )
72        {
73                /* In case the operator requests a restart, we need this. */
74                old_cwd = g_malloc( 256 );
75                if( getcwd( old_cwd, 255 ) == NULL )
76                {
77                        log_message( LOGLVL_WARNING, "Could not save current directory: %s", strerror( errno ) );
78                        g_free( old_cwd );
79                        old_cwd = NULL;
80                }
81               
82                i = bitlbee_daemon_init();
83                log_message( LOGLVL_INFO, "Bitlbee %s starting in forking daemon mode.", BITLBEE_VERSION );
84        }
85        if( i != 0 )
86                return( i );
87       
88        if( ( global.conf->user && *global.conf->user ) &&
89            ( global.conf->runmode == RUNMODE_DAEMON || 
90              global.conf->runmode == RUNMODE_FORKDAEMON ) &&
91            ( !getuid() || !geteuid() ) )
92        {
93                struct passwd *pw = NULL;
94                pw = getpwnam( global.conf->user );
95                if( pw )
96                {
97                        setgid( pw->pw_gid );
98                        setuid( pw->pw_uid );
99                }
100        }
101
102        global.storage = storage_init( global.conf->primary_storage, global.conf->migrate_storage );
103        if( global.storage == NULL )
104        {
105                log_message( LOGLVL_ERROR, "Unable to load storage backend '%s'", global.conf->primary_storage );
106                return( 1 );
107        }
108       
109        /* Catch some signals to tell the user what's happening before quitting */
110        memset( &sig, 0, sizeof( sig ) );
111        sig.sa_handler = sighandler;
112        sigaction( SIGCHLD, &sig, &old );
113        sigaction( SIGPIPE, &sig, &old );
114        sig.sa_flags = SA_RESETHAND;
115        sigaction( SIGINT,  &sig, &old );
116        sigaction( SIGILL,  &sig, &old );
117        sigaction( SIGBUS,  &sig, &old );
118        sigaction( SIGFPE,  &sig, &old );
119        sigaction( SIGSEGV, &sig, &old );
120        sigaction( SIGTERM, &sig, &old );
121        sigaction( SIGQUIT, &sig, &old );
122        sigaction( SIGXCPU, &sig, &old );
123       
124        if( !getuid() || !geteuid() )
125                log_message( LOGLVL_WARNING, "BitlBee is running with root privileges. Why?" );
126        if( help_init( &global.help, global.helpfile ) == NULL )
127                log_message( LOGLVL_WARNING, "Error opening helpfile %s.", HELP_FILE );
128       
129        b_main_run();
130       
131        /* Mainly good for restarting, to make sure we close the help.txt fd. */
132        help_free( &global.help );
133       
134        if( global.restart )
135        {
136                char *fn = ipc_master_save_state();
137               
138                chdir( old_cwd );
139               
140                setenv( "_BITLBEE_RESTART_STATE", fn, 1 );
141                g_free( fn );
142               
143                close( global.listen_socket );
144               
145                if( execv( argv[0], argv ) == -1 )
146                        /* Apparently the execve() failed, so let's just
147                           jump back into our own/current main(). */
148                        /* Need more cleanup code to make this work. */
149                        return 1; /* main( argc, argv ); */
150        }
151       
152        return( 0 );
153}
154
155static void sighandler( int signal )
156{
157        /* FIXME: Calling log_message() here is not a very good idea! */
158       
159        if( signal == SIGTERM )
160        {
161                static int first = 1;
162               
163                if( first )
164                {
165                        /* We don't know what we were doing when this signal came in. It's not safe to touch
166                           the user data now (not to mention writing them to disk), so add a timer. */
167                       
168                        log_message( LOGLVL_ERROR, "SIGTERM received, cleaning up process." );
169                        b_timeout_add( 1, (b_event_handler) bitlbee_shutdown, NULL );
170                       
171                        first = 0;
172                }
173                else
174                {
175                        /* Well, actually, for now we'll never need this part because this signal handler
176                           will never be called more than once in a session for a non-SIGPIPE signal...
177                           But just in case we decide to change that: */
178                       
179                        log_message( LOGLVL_ERROR, "SIGTERM received twice, so long for a clean shutdown." );
180                        raise( signal );
181                }
182        }
183        else if( signal == SIGCHLD )
184        {
185                pid_t pid;
186                int st;
187               
188                while( ( pid = waitpid( 0, &st, WNOHANG ) ) > 0 )
189                {
190                        if( WIFSIGNALED( st ) )
191                                log_message( LOGLVL_INFO, "Client %d terminated normally. (status = %d)", (int) pid, WEXITSTATUS( st ) );
192                        else if( WIFEXITED( st ) )
193                                log_message( LOGLVL_INFO, "Client %d killed by signal %d.", (int) pid, WTERMSIG( st ) );
194                }
195        }
196        else if( signal != SIGPIPE )
197        {
198                log_message( LOGLVL_ERROR, "Fatal signal received: %d. That's probably a bug.", signal );
199                raise( signal );
200        }
201}
202
203double gettime()
204{
205        struct timeval time[1];
206
207        gettimeofday( time, 0 );
208        return( (double) time->tv_sec + (double) time->tv_usec / 1000000 );
209}
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