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bitlbee.c
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bitlbee.c
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/********************************************************************\
* BitlBee -- An IRC to other IM-networks gateway *
* *
* Copyright 2002-2004 Wilmer van der Gaast and others *
\********************************************************************/
/* Main file */
/*
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License with
the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
if not, write to the Free Software Foundation, Inc., 51 Franklin St.,
Fifth Floor, Boston, MA 02110-1301 USA
*/
#define BITLBEE_CORE
#include "bitlbee.h"
#include "commands.h"
#include "protocols/nogaim.h"
#include "help.h"
#include "ipc.h"
#include <signal.h>
#include <stdio.h>
#include <errno.h>
static gboolean bitlbee_io_new_client(gpointer data, gint fd, b_input_condition condition);
static gboolean try_listen(struct addrinfo *res)
{
int i;
global.listen_socket = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (global.listen_socket < 0) {
log_error("socket");
return FALSE;
}
#ifdef IPV6_V6ONLY
if (res->ai_family == AF_INET6) {
i = 0;
setsockopt(global.listen_socket, IPPROTO_IPV6, IPV6_V6ONLY,
(char *) &i, sizeof(i));
}
#endif
/* TIME_WAIT (?) sucks.. */
i = 1;
setsockopt(global.listen_socket, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
i = bind(global.listen_socket, res->ai_addr, res->ai_addrlen);
if (i == -1) {
closesocket(global.listen_socket);
global.listen_socket = -1;
log_error("bind");
return FALSE;
}
return TRUE;
}
int bitlbee_daemon_init()
{
struct addrinfo *res, hints, *addrinfo_bind;
int i;
FILE *fp;
log_link(LOGLVL_ERROR, LOGOUTPUT_CONSOLE);
log_link(LOGLVL_WARNING, LOGOUTPUT_CONSOLE);
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE
#ifdef AI_ADDRCONFIG
/* Disabled as it may be doing more harm than good: this flag
ignores IPv6 addresses on lo (which seems reasonable), but
the result is that some clients (including irssi) try to
connect to ::1 and fail.
| AI_ADDRCONFIG */
#endif
;
i = getaddrinfo(global.conf->iface_in, global.conf->port, &hints, &addrinfo_bind);
if (i) {
log_message(LOGLVL_ERROR, "Couldn't parse address `%s': %s",
global.conf->iface_in, gai_strerror(i));
return -1;
}
global.listen_socket = -1;
/* Try IPv6 first (which will become an IPv6+IPv4 socket). */
for (res = addrinfo_bind; res; res = res->ai_next) {
if (res->ai_family == AF_INET6 && try_listen(res)) {
break;
}
}
/* The rest (so IPv4, I guess). */
if (res == NULL) {
for (res = addrinfo_bind; res; res = res->ai_next) {
if (res->ai_family != AF_INET6 && try_listen(res)) {
break;
}
}
}
freeaddrinfo(addrinfo_bind);
i = listen(global.listen_socket, 10);
if (i == -1) {
log_error("listen");
return(-1);
}
global.listen_watch_source_id = b_input_add(global.listen_socket, B_EV_IO_READ, bitlbee_io_new_client, NULL);
if (!global.conf->nofork) {
i = fork();
if (i == -1) {
log_error("fork");
return(-1);
} else if (i != 0) {
exit(0);
}
setsid();
i = chdir("/");
/* Don't use i, just make gcc happy. :-/ */
if (getenv("_BITLBEE_RESTART_STATE") == NULL) {
for (i = 0; i < 3; i++) {
if (close(i) == 0) {
/* Keep something bogus on those fd's just in case. */
open("/dev/null", O_WRONLY);
}
}
}
}
if (global.conf->runmode == RUNMODE_FORKDAEMON) {
ipc_master_load_state(getenv("_BITLBEE_RESTART_STATE"));
}
if (global.conf->runmode == RUNMODE_DAEMON || global.conf->runmode == RUNMODE_FORKDAEMON) {
ipc_master_listen_socket();
}
if ((fp = fopen(global.conf->pidfile, "w"))) {
fprintf(fp, "%d\n", (int) getpid());
fclose(fp);
} else {
log_message(LOGLVL_WARNING, "Warning: Couldn't write PID to `%s'", global.conf->pidfile);
}
if (!global.conf->nofork) {
log_link(LOGLVL_ERROR, LOGOUTPUT_SYSLOG);
log_link(LOGLVL_WARNING, LOGOUTPUT_SYSLOG);
}
return(0);
}
int bitlbee_inetd_init()
{
if (!irc_new(0)) {
return(1);
}
return(0);
}
gboolean bitlbee_io_current_client_read(gpointer data, gint fd, b_input_condition cond)
{
irc_t *irc = data;
char line[513];
int st;
st = read(irc->fd, line, sizeof(line) - 1);
if (st == 0) {
irc_abort(irc, 1, "Connection reset by peer");
return FALSE;
} else if (st < 0) {
if (sockerr_again()) {
return TRUE;
} else {
irc_abort(irc, 1, "Read error: %s", strerror(errno));
return FALSE;
}
}
line[st] = '\0';
if (irc->readbuffer == NULL) {
irc->readbuffer = g_strdup(line);
} else {
irc->readbuffer = g_renew(char, irc->readbuffer, strlen(irc->readbuffer) + strlen(line) + 1);
strcpy((irc->readbuffer + strlen(irc->readbuffer)), line);
}
irc_process(irc);
/* Normally, irc_process() shouldn't call irc_free() but irc_abort(). Just in case: */
if (!g_slist_find(irc_connection_list, irc)) {
log_message(LOGLVL_WARNING, "Abnormal termination of connection with fd %d.", fd);
return FALSE;
}
/* Very naughty, go read the RFCs! >:) */
if (irc->readbuffer && (strlen(irc->readbuffer) > 1024)) {
irc_abort(irc, 0, "Maximum line length exceeded");
return FALSE;
}
return TRUE;
}
gboolean bitlbee_io_current_client_write(gpointer data, gint fd, b_input_condition cond)
{
irc_t *irc = data;
int st, size;
char *temp;
if (irc->sendbuffer == NULL) {
return FALSE;
}
size = strlen(irc->sendbuffer);
st = write(irc->fd, irc->sendbuffer, size);
if (st == 0 || (st < 0 && !sockerr_again())) {
irc_abort(irc, 1, "Write error: %s", strerror(errno));
return FALSE;
} else if (st < 0) { /* && sockerr_again() */
return TRUE;
}
if (st == size) {
g_free(irc->sendbuffer);
irc->sendbuffer = NULL;
irc->w_watch_source_id = 0;
return FALSE;
} else {
temp = g_strdup(irc->sendbuffer + st);
g_free(irc->sendbuffer);
irc->sendbuffer = temp;
return TRUE;
}
}
static gboolean bitlbee_io_new_client(gpointer data, gint fd, b_input_condition condition)
{
socklen_t size = sizeof(struct sockaddr_in);
struct sockaddr_in conn_info;
int new_socket = accept(global.listen_socket, (struct sockaddr *) &conn_info, &size);
if (new_socket == -1) {
log_message(LOGLVL_WARNING, "Could not accept new connection: %s", strerror(errno));
return TRUE;
}
if (global.conf->runmode == RUNMODE_FORKDAEMON) {
pid_t client_pid = 0;
int fds[2];
if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == -1) {
log_message(LOGLVL_WARNING, "Could not create IPC socket for client: %s", strerror(errno));
fds[0] = fds[1] = -1;
}
sock_make_nonblocking(fds[0]);
sock_make_nonblocking(fds[1]);
client_pid = fork();
if (client_pid > 0 && fds[0] != -1) {
struct bitlbee_child *child;
/* TODO: Stuff like this belongs in ipc.c. */
child = g_new0(struct bitlbee_child, 1);
child->pid = client_pid;
child->ipc_fd = fds[0];
child->ipc_inpa = b_input_add(child->ipc_fd, B_EV_IO_READ, ipc_master_read, child);
child->to_fd = -1;
child_list = g_slist_append(child_list, child);
log_message(LOGLVL_INFO, "Creating new subprocess with pid %d.", (int) client_pid);
/* Close some things we don't need in the parent process. */
close(new_socket);
close(fds[1]);
} else if (client_pid == 0) {
irc_t *irc;
b_main_init();
/* Close the listening socket, we're a client. */
close(global.listen_socket);
b_event_remove(global.listen_watch_source_id);
/* Make a new pipe for the shutdown signal handler */
sighandler_shutdown_setup();
/* Make the connection. */
irc = irc_new(new_socket);
/* We can store the IPC fd there now. */
global.listen_socket = fds[1];
global.listen_watch_source_id = b_input_add(fds[1], B_EV_IO_READ, ipc_child_read, irc);
close(fds[0]);
ipc_master_free_all();
}
} else {
log_message(LOGLVL_INFO, "Creating new connection with fd %d.", new_socket);
irc_new(new_socket);
}
return TRUE;
}
gboolean bitlbee_shutdown(gpointer data, gint fd, b_input_condition cond)
{
/* Send the message here with now=TRUE to ensure it arrives */
irc_write_all(TRUE, "ERROR :Closing link: BitlBee server shutting down");
/* Try to save data for all active connections (if desired). */
while (irc_connection_list != NULL) {
irc_abort(irc_connection_list->data, TRUE, NULL);
}
/* We'll only reach this point when not running in inetd mode: */
b_main_quit();
return FALSE;
}