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ircu2/ircd/ircd.c

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/*
* IRC - Internet Relay Chat, ircd/ircd.c
* Copyright (C) 1990 Jarkko Oikarinen and
* University of Oulu, Computing Center
*
* 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 1, 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
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/** @file
* @brief Entry point and other initialization functions for the daemon.
* @version $Id: ircd.c 1912 2009-07-04 22:44:19Z entrope $
*/
#include "config.h"
#include "ircd.h"
#include "IPcheck.h"
#include "class.h"
#include "client.h"
#include "crule.h"
#include "destruct_event.h"
#include "hash.h"
#include "ircd_alloc.h"
#include "ircd_events.h"
#include "ircd_features.h"
#include "ircd_geoip.h"
#include "ircd_log.h"
#include "ircd_reply.h"
#include "ircd_signal.h"
#include "ircd_string.h"
#include "ircd_crypt.h"
#include "jupe.h"
#include "list.h"
#include "match.h"
#include "motd.h"
#include "msg.h"
#include "numeric.h"
#include "numnicks.h"
#include "opercmds.h"
#include "parse.h"
#include "querycmds.h"
#include "res.h"
#include "s_auth.h"
#include "s_bsd.h"
#include "s_conf.h"
#include "s_debug.h"
#include "s_misc.h"
#include "s_stats.h"
#include "s_user.h"
#include "send.h"
#include "ssl.h"
#include "sys.h"
#include "uping.h"
#include "userload.h"
#include "version.h"
#include "whowas.h"
/* #include <assert.h> -- Now using assert in ircd_log.h */
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
/*----------------------------------------------------------------------------
* External stuff
*--------------------------------------------------------------------------*/
extern void init_counters(void);
extern void mem_dbg_initialise(void);
/*----------------------------------------------------------------------------
* Constants / Enums
*--------------------------------------------------------------------------*/
enum {
BOOT_DEBUG = 1, /**< Enable debug output. */
BOOT_TTY = 2, /**< Stay connected to TTY. */
BOOT_CHKCONF = 4 /**< Exit after reading configuration file. */
};
/*----------------------------------------------------------------------------
* Global data (YUCK!)
*--------------------------------------------------------------------------*/
struct Client me; /**< That's me */
struct Connection me_con; /**< That's me too */
struct Client *GlobalClientList = &me; /**< Pointer to beginning of
Client list */
time_t TSoffset = 0; /**< Offset of timestamps to system clock */
int GlobalRehashFlag = 0; /**< do a rehash if set */
int GlobalRestartFlag = 0; /**< do a restart if set */
time_t CurrentTime; /**< Updated every time we leave select() */
char *configfile = CPATH; /**< Server configuration file */
int debuglevel = -1; /**< Server debug level */
char *debugmode = ""; /**< Server debug level */
static char *dpath = DPATH; /**< Working directory for daemon */
static char *dbg_client; /**< Client specifier for chkconf */
static struct Timer connect_timer; /**< timer structure for try_connections() */
static struct Timer ping_timer; /**< timer structure for check_pings() */
static struct Timer destruct_event_timer; /**< timer structure for exec_expired_destruct_events() */
/** Daemon information. */
static struct Daemon thisServer = { 0, 0, 0, 0, 0, 0, -1 };
/** Non-zero until we want to exit. */
int running = 1;
/*----------------------------------------------------------------------------
* API: server_die
*--------------------------------------------------------------------------*/
/** Terminate the server with a message.
* @param[in] message Message to log and send to operators.
*/
void server_die(const char *message)
{
/* log_write will send out message to both log file and as server notice */
log_write(LS_SYSTEM, L_CRIT, 0, "Server terminating: %s", message);
flush_connections(0);
close_connections(1);
running = 0;
}
/*----------------------------------------------------------------------------
* API: server_panic
*--------------------------------------------------------------------------*/
/** Immediately terminate the server with a message.
* @param[in] message Message to log, but not send to operators.
*/
void server_panic(const char *message)
{
/* inhibit sending server notice--we may be panicking due to low memory */
log_write(LS_SYSTEM, L_CRIT, LOG_NOSNOTICE, "Server panic: %s", message);
flush_connections(0);
log_close();
close_connections(1);
exit(1);
}
/*----------------------------------------------------------------------------
* API: server_restart
*--------------------------------------------------------------------------*/
/** Restart the server with a message.
* @param[in] message Message to log and send to operators.
*/
void server_restart(const char *message)
{
static int restarting = 0;
/* inhibit sending any server notices; we may be in a loop */
log_write(LS_SYSTEM, L_WARNING, LOG_NOSNOTICE, "Restarting Server: %s",
message);
if (restarting++) /* increment restarting to prevent looping */
return;
sendto_opmask_butone(0, SNO_OLDSNO, "Restarting server: %s", message);
Debug((DEBUG_NOTICE, "Restarting server..."));
flush_connections(0);
log_close();
close_connections(!(thisServer.bootopt & (BOOT_TTY | BOOT_DEBUG | BOOT_CHKCONF)));
reap_children();
execv(SPATH, thisServer.argv);
/* Have to reopen since it has been closed above */
log_reopen();
log_write(LS_SYSTEM, L_CRIT, 0, "execv(%s,%s) failed: %m", SPATH,
*thisServer.argv);
Debug((DEBUG_FATAL, "Couldn't restart server \"%s\": %s",
SPATH, (strerror(errno)) ? strerror(errno) : ""));
exit(8);
}
/*----------------------------------------------------------------------------
* outofmemory: Handler for out of memory conditions...
*--------------------------------------------------------------------------*/
/** Handle out-of-memory condition. */
static void outofmemory(void) {
Debug((DEBUG_FATAL, "Out of memory: restarting server..."));
server_restart("Out of Memory");
}
/*----------------------------------------------------------------------------
* write_pidfile
*--------------------------------------------------------------------------*/
/** Write process ID to PID file. */
static void write_pidfile(void) {
char buff[20];
if (thisServer.pid_fd >= 0) {
memset(buff, 0, sizeof(buff));
sprintf(buff, "%5d\n", (int)getpid());
if (write(thisServer.pid_fd, buff, strlen(buff)) == -1)
Debug((DEBUG_NOTICE, "Error writing to pid file %s: %m",
feature_str(FEAT_PPATH)));
return;
}
Debug((DEBUG_NOTICE, "Error opening pid file %s: %m",
feature_str(FEAT_PPATH)));
}
/** Try to create the PID file.
* @return Zero on success; non-zero on any error.
*/
static int check_pid(void)
{
struct flock lock;
lock.l_type = F_WRLCK;
lock.l_start = 0;
lock.l_whence = SEEK_SET;
lock.l_len = 0;
if ((thisServer.pid_fd = open(feature_str(FEAT_PPATH), O_CREAT | O_RDWR,
0600)) >= 0)
return fcntl(thisServer.pid_fd, F_SETLK, &lock) == -1;
return 1;
}
/** Look for any connections that we should try to initiate.
* Reschedules itself to run again at the appropriate time.
* @param[in] ev Timer event (ignored).
*/
static void try_connections(struct Event* ev) {
struct ConfItem* aconf;
struct ConfItem** pconf;
time_t next;
struct Jupe* ajupe;
int hold;
int done;
assert(ET_EXPIRE == ev_type(ev));
assert(0 != ev_timer(ev));
Debug((DEBUG_NOTICE, "Connection check at : %s", myctime(CurrentTime)));
next = CurrentTime + feature_int(FEAT_CONNECTFREQUENCY);
done = 0;
for (aconf = GlobalConfList; aconf; aconf = aconf->next) {
/* Only consider server items with non-zero port and non-zero
* connect times that are not actively juped.
*/
if (!(aconf->status & CONF_SERVER)
|| aconf->address.port == 0
|| !(aconf->flags & CONF_AUTOCONNECT)
|| ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe)))
continue;
/* Do we need to postpone this connection further? */
hold = aconf->hold > CurrentTime;
/* Update next possible connection check time. */
if (hold && next > aconf->hold)
next = aconf->hold;
/* Do not try to connect if its use is still on hold until future,
* we have already initiated a connection this try_connections(),
* too many links in its connection class, it is already linked,
* or if connect rules forbid a link now.
*/
if (hold || done
|| (ConfLinks(aconf) > ConfMaxLinks(aconf))
|| FindServer(aconf->name)
|| conf_eval_crule(aconf->name, CRULE_MASK))
continue;
/* Ensure it is at the end of the list for future checks. */
if (aconf->next) {
/* Find aconf's location in the list and splice it out. */
for (pconf = &GlobalConfList; *pconf; pconf = &(*pconf)->next)
if (*pconf == aconf)
*pconf = aconf->next;
/* Reinsert it at the end of the list (where pconf is now). */
*pconf = aconf;
aconf->next = 0;
}
/* Activate the connection itself. */
if (connect_server(aconf, 0))
sendto_opmask_butone(0, SNO_OLDSNO, "Connection to %s activated.",
aconf->name);
/* And stop looking for further candidates. */
done = 1;
}
Debug((DEBUG_NOTICE, "Next connection check : %s", myctime(next)));
timer_add(&connect_timer, try_connections, 0, TT_ABSOLUTE, next);
}
/** Check for clients that have not sent a ping response recently.
* Reschedules itself to run again at the appropriate time.
* @param[in] ev Timer event (ignored).
*/
static void check_pings(struct Event* ev) {
int expire = 0;
int next_check = CurrentTime;
int max_ping = 0;
int i;
assert(ET_EXPIRE == ev_type(ev));
assert(0 != ev_timer(ev));
next_check += feature_int(FEAT_PINGFREQUENCY);
/* Scan through the client table */
for (i=0; i <= HighestFd; i++) {
struct Client *cptr = LocalClientArray[i];
if (!cptr)
continue;
assert(&me != cptr); /* I should never be in the local client array! */
/* Remove dead clients. */
if (IsDead(cptr)) {
exit_client(cptr, cptr, &me, cli_info(cptr));
continue;
}
Debug((DEBUG_DEBUG, "check_pings(%s)=status:%s current: %d",
cli_name(cptr),
IsPingSent(cptr) ? "[Ping Sent]" : "[]",
(int)(CurrentTime - cli_lasttime(cptr))));
/* Unregistered clients pingout after max_ping seconds, they don't
* get given a second chance - if they were then people could not quite
* finish registration and hold resources without being subject to k/g
* lines
*/
if (!IsRegistered(cptr)) {
assert(!IsServer(cptr));
max_ping = feature_int(FEAT_CONNECTTIMEOUT);
/* If client authorization time has expired, ask auth whether they
* should be checked again later. */
if ((CurrentTime-cli_firsttime(cptr) >= max_ping)
&& auth_ping_timeout(cptr))
continue;
if (!IsRegistered(cptr)) {
/* OK, they still have enough time left, so we'll just skip to the
* next client. Set the next check to be when their time is up, if
* that's before the currently scheduled next check -- hikari */
expire = cli_firsttime(cptr) + max_ping;
if (expire < next_check)
next_check = expire;
continue;
}
}
max_ping = client_get_ping(cptr);
/* If it's a server and we have not sent an AsLL lately, do so. */
if (IsServer(cptr)) {
if (CurrentTime - cli_serv(cptr)->asll_last >= max_ping) {
char *asll_ts;
SetPingSent(cptr);
cli_serv(cptr)->asll_last = CurrentTime;
expire = cli_serv(cptr)->asll_last + max_ping;
asll_ts = militime_float(NULL);
sendcmdto_prio_one(&me, CMD_PING, cptr, "!%s %s %s", asll_ts,
cli_name(cptr), asll_ts);
}
expire = cli_serv(cptr)->asll_last + max_ping;
if (expire < next_check)
next_check = expire;
}
/* Ok, the thing that will happen most frequently, is that someone will
* have sent something recently. Cover this first for speed.
* --
* If it's an unregistered client and hasn't managed to register within
* max_ping then it's obviously having problems (broken client) or it's
* just up to no good, so we won't skip it, even if its been sending
* data to us.
* -- hikari
*/
if ((CurrentTime-cli_lasttime(cptr) < max_ping) && IsRegistered(cptr)) {
expire = cli_lasttime(cptr) + max_ping;
if (expire < next_check)
next_check = expire;
continue;
}
/* Quit the client after max_ping*2 - they should have answered by now */
if (CurrentTime-cli_lasttime(cptr) >= (max_ping*2) )
{
/* If it was a server, then tell ops about it. */
if (IsServer(cptr) || IsConnecting(cptr) || IsHandshake(cptr))
sendto_opmask_butone(0, SNO_OLDSNO,
"No response from %s, closing link",
cli_name(cptr));
exit_client_msg(cptr, cptr, &me, "Ping timeout");
continue;
}
if (!IsPingSent(cptr))
{
/* If we haven't PINGed the connection and we haven't heard from it in a
* while, PING it to make sure it is still alive.
*/
SetPingSent(cptr);
/* If we're late in noticing don't hold it against them :) */
cli_lasttime(cptr) = CurrentTime - max_ping;
if (IsUser(cptr))
sendrawto_one(cptr, MSG_PING " :%s", cli_name(&me));
else
sendcmdto_prio_one(&me, CMD_PING, cptr, ":%s", cli_name(&me));
}
expire = cli_lasttime(cptr) + max_ping * 2;
if (expire < next_check)
next_check=expire;
}
assert(next_check >= CurrentTime);
Debug((DEBUG_DEBUG, "[%i] check_pings() again in %is",
CurrentTime, next_check-CurrentTime));
timer_add(&ping_timer, check_pings, 0, TT_ABSOLUTE, next_check);
}
/** Parse command line arguments.
* Global variables are updated to reflect the arguments.
* As a side effect, makes sure the process's effective user id is the
* same as the real user id.
* @param[in] argc Number of arguments on command line.
* @param[in,out] argv Command-lne arguments.
*/
static void parse_command_line(int argc, char** argv) {
const char *options = "d:f:h:nktvx:c:";
int opt;
if (thisServer.euid != thisServer.uid)
(void)!setuid(thisServer.uid);
/* Do we really need to sanity check the non-NULLness of optarg? That's
* getopt()'s job... Removing those... -zs
*/
while ((opt = getopt(argc, argv, options)) != EOF)
switch (opt) {
case 'k': thisServer.bootopt |= BOOT_CHKCONF | BOOT_TTY; break;
case 'c': dbg_client = optarg; break;
case 'n':
case 't': thisServer.bootopt |= BOOT_TTY; break;
case 'd': dpath = optarg; break;
case 'f': configfile = optarg; break;
case 'h': ircd_strncpy(cli_name(&me), optarg, HOSTLEN + 1); break;
case 'v':
printf("ircd %s+[%s]\n", version, cvs_version);
printf("Event engines: ");
#ifdef USE_KQUEUE
printf("kqueue() ");
#endif
#ifdef USE_DEVPOLL
printf("/dev/poll ");
#endif
#ifdef USE_EPOLL
printf("epoll_*() ");
#endif
#ifdef USE_POLL
printf("poll()");
#else
printf("select()");
#endif
printf("\nCompiled for a maximum of %d connections.\n", MAXCONNECTIONS);
exit(0);
break;
case 'x':
debuglevel = atoi(optarg);
if (debuglevel < 0)
debuglevel = 0;
debugmode = optarg;
thisServer.bootopt |= BOOT_DEBUG;
#ifndef DEBUGMODE
printf("WARNING: DEBUGMODE disabled; -x has no effect.\n");
#endif
break;
default:
printf("Usage: ircd [-f config] [-h servername] [-x loglevel] [-ntv] [-k [-c clispec]]\n"
"\n -f config\t specify explicit configuration file"
"\n -d directory\t specify explicit working directory"
"\n -x loglevel\t set debug logging verbosity"
"\n -n or -t\t don't detach"
"\n -v\t\t display version"
"\n -k\t\t exit after checking config"
"\n -c clispec\t search for client/kill blocks matching client"
"\n\t\t clispec is comma-separated list of user@host,"
"\n\t\t user@ip, $Rrealname, and port number"
"\n\nServer not started.\n");
exit(1);
}
}
/** Become a daemon.
* @param[in] no_fork If non-zero, do not fork into the background.
*/
static void daemon_init(int no_fork) {
if (no_fork)
return;
if (fork())
exit(0);
#ifdef TIOCNOTTY
{
int fd;
if ((fd = open("/dev/tty", O_RDWR)) > -1) {
ioctl(fd, TIOCNOTTY, 0);
close(fd);
}
}
#endif
setsid();
}
/** Check that we have access to a particular file.
* If we do not have access to the file, complain on stderr.
* @param[in] path File name to check for access.
* @param[in] which Configuration character associated with file.
* @param[in] mode Bitwise combination of R_OK, W_OK, X_OK and/or F_OK.
* @return Non-zero if we have the necessary access, zero if not.
*/
static char check_file_access(const char *path, char which, int mode) {
if (!access(path, mode))
return 1;
fprintf(stderr,
"Check on %cPATH (%s) failed: %s\n"
"Please create this file and/or rerun `configure' "
"using --with-%cpath and recompile to correct this.\n",
which, path, strerror(errno), which);
return 0;
}
/*----------------------------------------------------------------------------
* set_core_limit
*--------------------------------------------------------------------------*/
#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
/** Set the core size soft limit to the same as the hard limit. */
static void set_core_limit(void) {
struct rlimit corelim;
if (getrlimit(RLIMIT_CORE, &corelim)) {
fprintf(stderr, "Read of rlimit core size failed: %s\n", strerror(errno));
corelim.rlim_max = RLIM_INFINITY; /* Try to recover */
}
corelim.rlim_cur = corelim.rlim_max;
if (setrlimit(RLIMIT_CORE, &corelim))
fprintf(stderr, "Setting rlimit core size failed: %s\n", strerror(errno));
}
#endif
/** Complain to stderr if any user or group ID belongs to the superuser.
* @return Non-zero if all IDs are okay, zero if some are 0.
*/
static int set_userid_if_needed(void) {
if (getuid() == 0 || geteuid() == 0 ||
getgid() == 0 || getegid() == 0) {
fprintf(stderr, "ERROR: This server will not run as superuser.\n");
return 0;
}
return 1;
}
/*----------------------------------------------------------------------------
* main - entrypoint
*
* TODO: This should set the basic environment up and start the main loop.
* we're doing waaaaaaaaay too much server initialization here. I hate
* long and ugly control paths... -smd
*--------------------------------------------------------------------------*/
/** Run the daemon.
* @param[in] argc Number of arguments in \a argv.
* @param[in] argv Arguments to program execution.
*/
int main(int argc, char **argv) {
CurrentTime = time(NULL);
thisServer.argc = argc;
thisServer.argv = argv;
thisServer.uid = getuid();
thisServer.euid = geteuid();
#ifdef MDEBUG
mem_dbg_initialise();
#endif
#if defined(HAVE_SETRLIMIT) && defined(RLIMIT_CORE)
set_core_limit();
#endif
umask(077); /* better safe than sorry --SRB */
memset(&me, 0, sizeof(me));
memset(&me_con, 0, sizeof(me_con));
cli_connect(&me) = &me_con;
cli_fd(&me) = -1;
parse_command_line(argc, argv);
if (chdir(dpath)) {
fprintf(stderr, "Fail: Cannot chdir(%s): %s, check DPATH\n", dpath, strerror(errno));
return 2;
}
if (!set_userid_if_needed())
return 3;
/* Check paths for accessibility */
if (!check_file_access(SPATH, 'S', X_OK) ||
!check_file_access(configfile, 'C', R_OK))
return 4;
if (!init_connection_limits())
return 9;
close_connections(!(thisServer.bootopt & (BOOT_DEBUG | BOOT_TTY | BOOT_CHKCONF)));
/* daemon_init() must be before event_init() because kqueue() FDs
* are, perversely, not inherited across fork().
*/
daemon_init(thisServer.bootopt & BOOT_TTY);
#ifdef DEBUGMODE
/* Must reserve fd 2... */
if (debuglevel >= 0 && !(thisServer.bootopt & BOOT_TTY)) {
int fd;
if ((fd = open("/dev/null", O_WRONLY)) < 0) {
fprintf(stderr, "Unable to open /dev/null (to reserve fd 2): %s\n",
strerror(errno));
return 8;
}
if (fd != 2 && dup2(fd, 2) < 0) {
fprintf(stderr, "Unable to reserve fd 2; dup2 said: %s\n",
strerror(errno));
return 8;
}
}
#endif
event_init(MAXCONNECTIONS);
setup_signals();
feature_init(); /* initialize features... */
init_isupport(); /* initialize RPL_ISUPPORT... */
log_init(*argv);
set_nomem_handler(outofmemory);
initload();
init_list();
init_hash();
init_class();
initwhowas();
initmsgtree();
initstats();
/* we need this for now, when we're modular this
should be removed -- hikari */
ircd_crypt_init();
motd_init();
if (!init_conf()) {
log_write(LS_SYSTEM, L_CRIT, 0, "Failed to read configuration file %s",
configfile);
return 7;
}
if (thisServer.bootopt & BOOT_CHKCONF) {
if (dbg_client)
conf_debug_iline(dbg_client);
fprintf(stderr, "Configuration file %s checked okay.\n", configfile);
return 0;
}
debug_init(thisServer.bootopt & BOOT_TTY);
if (check_pid()) {
Debug((DEBUG_FATAL, "Failed to acquire PID file lock after fork"));
exit(2);
}
init_server_identity();
#ifdef USE_SSL
if (ssl_init()) {
Debug((DEBUG_FATAL, "Failed to initialize SSL contexts"));
exit(1);
}
#endif
uping_init();
stats_init();
IPcheck_init();
timer_add(timer_init(&connect_timer), try_connections, 0, TT_RELATIVE, 1);
timer_add(timer_init(&ping_timer), check_pings, 0, TT_RELATIVE, 1);
timer_add(timer_init(&destruct_event_timer), exec_expired_destruct_events, 0, TT_PERIODIC, 60);
CurrentTime = time(NULL);
SetMe(&me);
cli_magic(&me) = CLIENT_MAGIC;
cli_from(&me) = &me;
make_server(&me);
cli_serv(&me)->timestamp = TStime(); /* Abuse own link timestamp as start TS */
cli_serv(&me)->prot = atoi(MAJOR_PROTOCOL);
cli_serv(&me)->up = &me;
cli_serv(&me)->down = NULL;
cli_handler(&me) = SERVER_HANDLER;
SetYXXCapacity(&me, MAXCLIENTS);
cli_lasttime(&me) = cli_since(&me) = cli_firsttime(&me) = CurrentTime;
hAddClient(&me);
SetIPv6(&me);
write_pidfile();
init_counters();
load_tunefile();
geoip_init();
Debug((DEBUG_NOTICE, "Server ready..."));
log_write(LS_SYSTEM, L_NOTICE, 0, "Server Ready");
event_loop();
return 0;
}
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