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server.c
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server.c
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/*****************************************************************************
* $Id: server.c 1061 2011-04-21 23:13:41Z chris.m.dunlap $
*****************************************************************************
* Written by Chris Dunlap <cdunlap@llnl.gov>.
* Copyright (C) 2007-2011 Lawrence Livermore National Security, LLC.
* Copyright (C) 2001-2007 The Regents of the University of California.
* UCRL-CODE-2002-009.
*
* This file is part of ConMan: The Console Manager.
* For details, see <http://conman.googlecode.com/>.
*
* ConMan 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 3 of the License, or (at your option)
* any later version.
*
* ConMan 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 ConMan. If not, see <http://www.gnu.org/licenses/>.
*****************************************************************************/
#if HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <netinet/in.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "common.h"
#include "inevent.h"
#include "list.h"
#include "log.h"
#include "server.h"
#include "tpoll.h"
#include "util-file.h"
#include "util-str.h"
#include "util.h"
static void begin_daemonize(int *fd_ptr, pid_t *pgid_ptr);
static void end_daemonize(int fd);
static void setup_coredump(server_conf_t *conf);
static void setup_signals(server_conf_t *conf);
static void sig_chld_handler(int signum);
static void sig_hup_handler(int signum);
static void exit_handler(int signum);
static void coredump_handler(int signum);
static char ** get_sane_env(void);
static void display_configuration(server_conf_t *conf);
static void schedule_timestamp(server_conf_t *conf);
static void timestamp_logfiles(server_conf_t *conf);
static void create_listen_socket(server_conf_t *conf);
static void open_objs(server_conf_t *conf);
static void mux_io(server_conf_t *conf);
static void open_daemon_logfile(server_conf_t *conf);
static void reopen_logfiles(server_conf_t *conf);
static void accept_client(server_conf_t *conf);
static void reset_console(obj_t *console, const char *cmd);
static void kill_console_reset(pid_t *arg);
/* Signal handler flags and whatnot.
*/
static volatile sig_atomic_t done = 0;
static volatile sig_atomic_t reconfig = 0;
static int coredump = 0;
static char coredumpdir[PATH_MAX];
/* The 'tp_global' var is to allow timers to be set or canceled
* without having to pass the conf's tp var through the call stack.
*/
tpoll_t tp_global = NULL;
extern char ** environ;
int main(int argc, char *argv[])
{
int fd = -1;
pid_t pgid = -1;
server_conf_t *conf;
int log_priority = LOG_INFO;
#ifndef NDEBUG
log_priority = LOG_DEBUG;
#endif /* NDEBUG */
log_set_file(stderr, log_priority, 0);
conf = create_server_conf();
tp_global = conf->tp;
process_cmdline(conf, argc, argv);
if (!conf->enableForeground) {
begin_daemonize(&fd, &pgid);
}
process_config(conf);
setup_coredump(conf);
setup_signals(conf);
if (!(environ = get_sane_env())) {
log_err(ENOMEM, "Unable to create sanitized environment");
}
if (conf->enableVerbose) {
display_configuration(conf);
}
if (list_is_empty(conf->objs)) {
log_err(0, "Configuration \"%s\" has no consoles defined",
conf->confFileName);
}
if (conf->tStampMinutes > 0) {
schedule_timestamp(conf);
}
create_listen_socket(conf);
if (!conf->enableForeground) {
if (conf->syslogFacility > 0) {
log_set_syslog(argv[0], conf->syslogFacility);
}
if (conf->logFileName) {
open_daemon_logfile(conf);
}
else {
log_set_file(NULL, 0, 0);
}
end_daemonize(fd);
}
log_msg(LOG_NOTICE, "Starting ConMan daemon %s (pid %d)",
VERSION, (int) getpid());
#if WITH_FREEIPMI
ipmi_init(conf->numIpmiObjs);
#endif /* WITH_FREEIPMI */
open_objs(conf);
mux_io(conf);
#if WITH_FREEIPMI
ipmi_fini();
#endif /* WITH_FREEIPMI */
destroy_server_conf(conf);
if (pgid > 0) {
if (kill(-pgid, SIGTERM) < 0) {
log_msg(LOG_WARNING, "Unable to terminate process group ID %d: %s",
pgid, strerror(errno));
}
}
log_msg(LOG_NOTICE, "Stopping ConMan daemon %s (pid %d)",
VERSION, (int) getpid());
exit(0);
}
static void begin_daemonize(int *fd_ptr, pid_t *pgid_ptr)
{
/* Begins the daemonization of the process.
* Despite the fact that this routine backgrounds the process, control
* will not be returned to the shell until end_daemonize() is called.
* If 'fd_ptr' is non-null, it will be set to the fd to pass to
* end_daemonize() in order to complete the daemonization.
* If 'pgid_ptr' is non-null, it will be set to the daemonized
* process group ID.
*/
int fds[2];
pid_t pid;
int n;
signed char priority;
char ebuf[1024];
pid_t pgid;
/* Clear file mode creation mask.
*/
umask(0);
/* Create pipe for IPC so parent process will wait to terminate until
* signaled by grandchild process. This allows messages written to
* stdout/stderr by the grandchild to be properly displayed before
* the parent process returns control to the shell.
*/
if (pipe(fds) < 0) {
log_err(errno, "Unable to create daemon pipe");
}
/* Set the fd used by log_err() to return status back to the parent.
*/
log_set_err_pipe(fds[1]);
/* Automatically background the process and
* ensure child is not a process group leader.
*/
if ((pid = fork()) < 0) {
log_err(errno, "Unable to create child process");
}
else if (pid > 0) {
log_set_err_pipe(-1);
/*
* FIXME: The following log_err()s don't necessarily indicate the
* daemon has failed since the grandchild process may still be
* running. This could confuse the user. Should they be warnings
* instead?
*/
if (close(fds[1]) < 0) {
log_err(errno, "Unable to close write-pipe in parent process");
}
if ((n = read(fds[0], &priority, sizeof(priority))) < 0) {
log_err(errno, "Unable to read status from grandchild process");
}
if ((n > 0) && (priority >= 0)) {
if ((n = read(fds[0], ebuf, sizeof(ebuf))) < 0) {
log_err(errno,
"Unable to read error message from grandchild process");
}
if ((n > 0) && (ebuf[0] != '\0')) {
log_set_file(stderr, priority, 0);
log_msg(priority, "%s", ebuf);
}
exit(1);
}
exit(0);
}
if (close(fds[0]) < 0) {
log_err(errno, "Unable to close read-pipe in child process");
}
/* Become a session leader and process group leader
* with no controlling tty.
*/
if ((pgid = setsid()) < 0) {
log_err(errno, "Unable to disassociate controlling tty");
}
/* Ignore SIGHUP to keep child from terminating when
* the session leader (ie, the parent) terminates.
*/
posix_signal(SIGHUP, SIG_IGN);
/* Abdicate session leader position in order to guarantee
* daemon cannot automatically re-acquire a controlling tty.
*/
if ((pid = fork()) < 0) {
log_err(errno, "Unable to create grandchild process");
}
else if (pid > 0) {
exit(0);
}
/* Return.
*/
if (fd_ptr) {
*fd_ptr = fds[1];
}
if (pgid_ptr) {
*pgid_ptr = pgid;
}
return;
}
static void end_daemonize(int fd)
{
/* Completes the daemonization of the process,
* where 'fd' is the value returned by begin_daemonize().
*/
int dev_null;
/* Ensure process does not keep a directory in use.
* Avoid relative pathname from this point on!
*/
if (chdir("/") < 0) {
log_err(errno, "Unable to change to root directory");
}
/* Discard data to/from stdin, stdout, and stderr.
*/
if ((dev_null = open("/dev/null", O_RDWR)) < 0) {
log_err(errno, "Unable to open \"/dev/null\"");
}
if (dup2(dev_null, STDIN_FILENO) < 0) {
log_err(errno, "Unable to dup \"/dev/null\" onto stdin");
}
if (dup2(dev_null, STDOUT_FILENO) < 0) {
log_err(errno, "Unable to dup \"/dev/null\" onto stdout");
}
if (dup2(dev_null, STDERR_FILENO) < 0) {
log_err(errno, "Unable to dup \"/dev/null\" onto stderr");
}
if (close(dev_null) < 0) {
log_err(errno, "Unable to close \"/dev/null\"");
}
/* Clear the fd used by log_err() to return status back to the parent.
*/
log_set_err_pipe(-1);
/* Signal grandparent process to terminate.
*/
if ((fd >= 0) && (close(fd) < 0)) {
log_err(errno, "Unable to close write-pipe in grandchild process");
}
return;
}
static void setup_coredump(server_conf_t *conf)
{
struct rlimit limit;
if (conf->enableCoreDump) {
limit.rlim_cur = RLIM_INFINITY;
limit.rlim_max = RLIM_INFINITY;
coredump = 1;
if (conf->coreDumpDir) {
strlcpy(coredumpdir, conf->coreDumpDir, sizeof(coredumpdir));
}
else {
getcwd(coredumpdir, sizeof(coredumpdir));
}
}
else {
limit.rlim_cur = 0;
limit.rlim_max = 0;
coredump = 0;
coredumpdir[0] = '\0';
}
if (setrlimit(RLIMIT_CORE, &limit) < 0) {
log_err(errno, "Unable to set core dump file limit");
}
return;
}
static void setup_signals(server_conf_t *conf)
{
posix_signal(SIGCHLD, sig_chld_handler);
posix_signal(SIGHUP, sig_hup_handler);
posix_signal(SIGINT, exit_handler);
posix_signal(SIGPIPE, SIG_IGN);
posix_signal(SIGTERM, exit_handler);
/* These signals have a default action of terminate+core according to SUS.
*/
posix_signal(SIGABRT, coredump_handler);
posix_signal(SIGBUS, coredump_handler);
posix_signal(SIGFPE, coredump_handler);
posix_signal(SIGILL, coredump_handler);
posix_signal(SIGQUIT, coredump_handler);
posix_signal(SIGSEGV, coredump_handler);
return;
}
static void sig_chld_handler(int signum)
{
pid_t pid;
while ((pid = waitpid(-1, NULL, WNOHANG)) > 0) {;}
return;
}
static void sig_hup_handler(int signum)
{
reconfig = signum;
return;
}
static void exit_handler(int signum)
{
done = signum;
return;
}
static void coredump_handler(int signum)
{
if (coredump && *coredumpdir) {
log_msg(LOG_ERR, "Terminating on signal=%d (check \"%s\" for core)",
signum, coredumpdir);
}
else {
log_msg(LOG_ERR, "Terminating on signal=%d", signum);
}
umask(077);
if (coredump && *coredumpdir) {
(void) chdir(coredumpdir);
}
posix_signal(signum, SIG_DFL);
(void) kill(getpid(), signum);
return;
}
static char ** get_sane_env(void)
{
/* Creates a sanitized environment.
* Returns a NULL-terminated array of NUL-terminated "key=value" strings,
* or NULL on error.
* Based on the example in "Safe Initialization: Sanitizing the Environment",
* Chapter 1.1 of Secure Programming Cookbook by John Viega & Matt Messier.
*/
int env_num;
int env_len;
char **pp;
char *p;
char **env;
char *ptr;
int num;
int len;
char *env_restrict[] = {
"IFS= \t\n",
"PATH=" _PATH_STDPATH,
"TERM=dumb",
NULL
};
char *env_preserve[] = {
"DEBUG",
"TZ",
NULL
};
env_num = 1; /* for terminating NULL */
env_len = 0;
for (pp = env_restrict; *pp; pp++) {
env_len += strlen(*pp) + 1; /* str + NUL */
env_num++;
}
for (pp = env_preserve; *pp; pp++) {
if (!(p = getenv(*pp)))
continue;
env_len += strlen(*pp) + strlen(p) + 2; /* key + '=' + val + NUL */
env_num++;
}
env_len += (env_num * sizeof(char *));
if (!(env = malloc(env_len))) {
return(NULL);
}
ptr = (char *) env + (env_num * sizeof(char *));
num = 0;
for (pp = env_restrict; *pp; pp++) {
env[num++] = ptr;
len = strlen(*pp) + 1;
memcpy(ptr, *pp, len);
ptr += len;
}
for (pp = env_preserve; *pp; pp++) {
if (!(p = getenv(*pp)))
continue;
env[num++] = ptr;
len = strlen(*pp);
memcpy(ptr, *pp, len);
ptr += len;
*ptr++ = '=';
len = strlen(p) + 1;
memcpy(ptr, p, len);
ptr += len;
}
env[num++] = NULL;
assert(num == env_num);
assert(ptr == (char *) env + env_len);
return(env);
}
static void display_configuration(server_conf_t *conf)
{
/* Displays a summary of the server's configuration.
*/
ListIterator i;
obj_t *obj;
int n = 0;
int gotOptions = 0;
i = list_iterator_create(conf->objs);
while ((obj = list_next(i))) {
if (is_console_obj(obj)) {
n++;
}
}
list_iterator_destroy(i);
fprintf(stderr, "\nStarting ConMan daemon %s (pid %d)\n",
VERSION, (int) getpid());
fprintf(stderr, "Configuration: %s\n", conf->confFileName);
fprintf(stderr, "Options:");
if (conf->enableCoreDump) {
fprintf(stderr, " CoreDump");
gotOptions++;
}
if (conf->enableKeepAlive) {
fprintf(stderr, " KeepAlive");
gotOptions++;
}
if (conf->logFileName) {
fprintf(stderr, " LogFile");
gotOptions++;
}
if (conf->enableLoopBack) {
fprintf(stderr, " LoopBack");
gotOptions++;
}
if (conf->resetCmd) {
fprintf(stderr, " ResetCmd");
gotOptions++;
}
if (conf->syslogFacility >= 0) {
fprintf(stderr, " SysLog");
gotOptions++;
}
if (conf->enableTCPWrap) {
fprintf(stderr, " TCP-Wrappers");
gotOptions++;
}
if (conf->tStampMinutes > 0) {
fprintf(stderr, " TimeStamp=%dm", conf->tStampMinutes);
gotOptions++;
}
if (conf->enableZeroLogs) {
fprintf(stderr, " ZeroLogs");
gotOptions++;
}
if (!gotOptions) {
fprintf(stderr, " None");
}
fprintf(stderr, "\n");
fprintf(stderr, "Listening on port %d\n", conf->port);
fprintf(stderr, "Monitoring %d console%s\n", n, ((n == 1) ? "" : "s"));
fprintf(stderr, "\n");
return;
}
static void schedule_timestamp(server_conf_t *conf)
{
/* Schedules a timer for writing timestamps to the console logfiles.
*/
time_t t;
struct tm tm;
struct timeval tv;
int numCompleted;
assert(conf->tStampMinutes > 0);
t = conf->tStampNext;
get_localtime(&t, &tm);
/*
* If this is the first scheduled timestamp, compute the expiration time
* assuming timestamps have been scheduled regularly since midnight.
* Otherwise, base it off of the previous timestamp.
*/
if (!conf->tStampNext) {
numCompleted = ((tm.tm_hour * 60) + tm.tm_min) / conf->tStampMinutes;
tm.tm_min = (numCompleted + 1) * conf->tStampMinutes;
tm.tm_hour = 0;
}
else {
tm.tm_min += conf->tStampMinutes;
}
tm.tm_sec = 0;
if ((t = mktime(&tm)) == ((time_t) -1)) {
log_err(errno, "Unable to determine time of next logfile timestamp");
}
tv.tv_sec = t;
tv.tv_usec = 0;
conf->tStampNext = t;
/* The timer id is not saved because this timer will never be canceled.
*/
if (tpoll_timeout_absolute (tp_global,
(callback_f) timestamp_logfiles, conf, &tv) < 0) {
log_err(0, "Unable to create timer for timestamping logfiles");
}
return;
}
static void timestamp_logfiles(server_conf_t *conf)
{
/* Writes a timestamp message into all of the console logfiles.
*/
char *now;
ListIterator i;
obj_t *logfile;
char buf[MAX_LINE];
int gotLogs = 0;
now = create_long_time_string(0);
i = list_iterator_create(conf->objs);
while ((logfile = list_next(i))) {
if (!is_logfile_obj(logfile)) {
continue;
}
snprintf(buf, sizeof(buf), "%sConsole [%s] log at %s%s",
CONMAN_MSG_PREFIX, logfile->aux.logfile.console->name,
now, CONMAN_MSG_SUFFIX);
strcpy(&buf[sizeof(buf) - 3], "\r\n");
write_obj_data(logfile, buf, strlen(buf), 1);
gotLogs = 1;
}
list_iterator_destroy(i);
free(now);
/* If any logfile objs exist, schedule a timer for the next timestamp.
*/
if (gotLogs) {
schedule_timestamp(conf);
}
return;
}
static void create_listen_socket(server_conf_t *conf)
{
/* Creates the socket on which to listen for client connections.
*/
int ld;
struct sockaddr_in addr;
const int on = 1;
if ((ld = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
log_err(errno, "Unable to create listening socket");
}
DPRINTF((9, "Opened listen socket: fd=%d.\n", ld));
set_fd_nonblocking(ld);
set_fd_closed_on_exec(ld);
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(conf->port);
if (conf->enableLoopBack) {
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
}
else {
addr.sin_addr.s_addr = htonl(INADDR_ANY);
}
if (setsockopt(ld, SOL_SOCKET, SO_REUSEADDR,
(const void *) &on, sizeof(on)) < 0) {
log_err(errno, "Unable to set REUSEADDR socket option");
}
if (bind(ld, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
log_err(errno, "Unable to bind to port %d", conf->port);
}
if (listen(ld, 10) < 0) {
log_err(errno, "Unable to listen on port %d", conf->port);
}
conf->ld = ld;
return;
}
static void open_objs(server_conf_t *conf)
{
/* Initially opens everything in the 'objs' list.
*/
struct rlimit limit;
ListIterator i;
obj_t *obj;
if (getrlimit(RLIMIT_NOFILE, &limit) < 0) {
log_err(errno, "Unable to get open file limit");
}
if (limit.rlim_cur < limit.rlim_max) {
limit.rlim_cur = limit.rlim_max;
if (setrlimit(RLIMIT_NOFILE, &limit) < 0) {
log_msg(LOG_ERR,
"Unable to set open file limit to %d", limit.rlim_cur);
}
else {
log_msg(LOG_INFO,
"Increased open file limit to %d", limit.rlim_cur);
}
}
else {
log_msg(LOG_INFO, "Open file limit set to %d", limit.rlim_cur);
}
i = list_iterator_create(conf->objs);
while ((obj = list_next(i))) {
reopen_obj(obj);
}
list_iterator_destroy(i);
return;
}
static void mux_io(server_conf_t *conf)
{
/* Multiplexes I/O between all of the objs in the configuration.
* This routine is the heart of ConMan.
*/
ListIterator i;
int n;
obj_t *obj;
int inevent_fd;
assert(conf->tp != NULL);
assert(!list_is_empty(conf->objs));
i = list_iterator_create(conf->objs);
while (!done) {
if (reconfig) {
/*
* FIXME: A reconfig should pro'ly resurrect "downed" serial objs
* and reset reconnect timers of "downed" telnet objs.
*/
log_msg(LOG_NOTICE, "Performing reconfig on signal=%d", reconfig);
reopen_logfiles(conf);
reconfig = 0;
}
/* FIXME: Switch from recomputing the tpoll set on each loop iteration
* to modifying it based on events. This will eliminate the 1sec
* tpoll() sleep timeout and greatly reduce cpu utilization.
* It will also eliminate the maze of twisty conditions below.
*/
DPRINTF((25, "Recomputing tpoll fd set\n"));
(void) tpoll_zero(conf->tp, TPOLL_ZERO_FDS);
tpoll_set(conf->tp, conf->ld, POLLIN);
inevent_fd = inevent_get_fd();
if (inevent_fd >= 0) {
tpoll_set(conf->tp, inevent_get_fd(), POLLIN);
}
list_iterator_reset(i);
while ((obj = list_next(i))) {
if (obj->gotReset) {
reset_console(obj, conf->resetCmd);
}
if (obj->fd < 0) {
continue;
}
if ( (
( is_telnet_obj(obj) &&
obj->aux.telnet.state == CONMAN_TELNET_UP ) ||
( is_process_obj(obj) &&
obj->aux.process.state == CONMAN_PROCESS_UP ) ||
#if WITH_FREEIPMI
( is_ipmi_obj(obj) &&
obj->aux.ipmi.state == CONMAN_IPMI_UP ) ||
#endif /* WITH_FREEIPMI */
( is_unixsock_obj(obj) &&
obj->aux.unixsock.state == CONMAN_UNIXSOCK_UP ) ||
is_serial_obj(obj) ||
is_client_obj(obj)
)
&&
( ! obj->gotEOF ) )
{
tpoll_set(conf->tp, obj->fd, POLLIN);
}
if ( ( (obj->bufInPtr != obj->bufOutPtr) ||
(obj->gotEOF) ) &&
( ! (is_telnet_obj(obj) &&
obj->aux.telnet.state != CONMAN_TELNET_UP) ) &&
( ! (is_process_obj(obj) &&
obj->aux.process.state != CONMAN_PROCESS_UP) ) &&
#if WITH_FREEIPMI
( ! (is_ipmi_obj(obj) &&
obj->aux.ipmi.state != CONMAN_IPMI_UP) ) &&
#endif /* WITH_FREEIPMI */
( ! (is_unixsock_obj(obj) &&
obj->aux.unixsock.state != CONMAN_UNIXSOCK_UP) ) &&
( ! (is_client_obj(obj) &&
obj->aux.client.gotSuspend) ) )
{
tpoll_set(conf->tp, obj->fd, POLLOUT);
}
if (is_telnet_obj(obj) &&
obj->aux.telnet.state == CONMAN_TELNET_PENDING)
{
tpoll_set(conf->tp, obj->fd, POLLIN | POLLOUT);
}
}
DPRINTF((25, "Calling tpoll\n"));
while ((n = tpoll(conf->tp, 1000)) < 0) {
if (errno != EINTR) {
log_err(errno, "Unable to multiplex I/O");
}
else if (done || reconfig) {
break;
}
}
if (n <= 0) {
continue;
}
if (tpoll_is_set(conf->tp, conf->ld, POLLIN)) {
accept_client(conf);
}
if ((inevent_fd >= 0) && tpoll_is_set(conf->tp, inevent_fd, POLLIN)) {
inevent_process();
}
/* If read_from_obj() or write_to_obj() returns -1,
* the obj's buffer has been flushed. If it is a telnet obj,
* retain it and attempt to re-establish the connection;
* o/w, give up and remove it from the master objs list.
*/
list_iterator_reset(i);
while ((obj = list_next(i))) {
if (obj->fd < 0) {
continue;
}
if (is_telnet_obj(obj)
&& tpoll_is_set(conf->tp, obj->fd, POLLIN | POLLOUT)
&& (obj->aux.telnet.state == CONMAN_TELNET_PENDING)) {
open_telnet_obj(obj);
continue;
}
if (tpoll_is_set(conf->tp, obj->fd, POLLIN | POLLHUP | POLLERR)) {
if (read_from_obj(obj, conf->tp) < 0) {
list_delete(i);
continue;
}
if (obj->fd < 0) {
continue;
}
}
if (tpoll_is_set(conf->tp, obj->fd, POLLOUT)) {
if (write_to_obj(obj) < 0) {
list_delete(i);
continue;
}
if (obj->fd < 0) {
continue;
}
}
}
}
log_msg(LOG_NOTICE, "Exiting on signal=%d", done);
list_iterator_destroy(i);
return;
}
static void open_daemon_logfile(server_conf_t *conf)
{
/* (Re)opens the daemon logfile.
* Since this logfile can be re-opened after the daemon has chdir()'d,
* it must be specified with an absolute pathname.
*/
static int once = 1;
const char *mode = "a";
mode_t mask;
char dirname[PATH_MAX];
FILE *fp = NULL;
int fd;
assert(conf->logFileName != NULL);
assert(conf->logFileName[0] == '/');
assert(!conf->enableForeground);
/* Only truncate logfile at startup if needed.
*/
if (once) {
if (conf->enableZeroLogs) {
mode = "w";
}
once = 0;
}
/* Perform conversion specifier expansion.
*/
if (conf->logFmtName) {
char buf[MAX_LINE];
if (format_obj_string(buf, sizeof(buf), NULL, conf->logFmtName) < 0) {
log_msg(LOG_WARNING,
"Unable to open daemon logfile: filename too long");
goto err;
}
free(conf->logFileName);
conf->logFileName = create_string(buf);
}
/* Protect logfile against unauthorized writes by removing
* group+other write-access from current mask.
*/
mask = umask(0);
umask(mask | 022);
/*
* Create intermediate directories.
*/
if (get_dir_name(conf->logFileName, dirname, sizeof(dirname))) {
(void) create_dirs(dirname);
}
/* Open the logfile.
*/
fp = fopen(conf->logFileName, mode);
umask(mask);
if (!fp) {
log_msg(LOG_WARNING, "Unable to open daemon logfile \"%s\": %s",
conf->logFileName, strerror(errno));
goto err;
}
if ((fd = fileno(fp)) < 0) {
log_msg(LOG_WARNING,
"Unable to obtain descriptor for daemon logfile \"%s\": %s",
conf->logFileName, strerror(errno));
goto err;
}
if (get_write_lock(fd) < 0) {
log_msg(LOG_WARNING, "Unable to lock daemon logfile \"%s\"",
conf->logFileName);
goto err;
}
set_fd_closed_on_exec(fd);
/*
* Transition to new log file.
*/
log_set_file(fp, conf->logFileLevel, 1);
if (conf->logFilePtr) {
if (fclose(conf->logFilePtr) == EOF) {
log_msg(LOG_WARNING, "Unable to close daemon logfile \"%s\"",
conf->logFileName);
}
}
conf->logFilePtr = fp;
DPRINTF((9, "Opened logfile \"%s\": fd=%d.\n", conf->logFileName, fd));
return;
err:
if (fp) {
(void) fclose(fp);
}
/* Abandon old log file and go logless.
*/
log_set_file(NULL, 0, 0);
if (conf->logFilePtr) {
if (fclose(conf->logFilePtr) == EOF) {
log_msg(LOG_WARNING, "Unable to close daemon logfile \"%s\"",
conf->logFileName);
}
}
conf->logFilePtr = NULL;
return;
}
static void reopen_logfiles(server_conf_t *conf)
{
/* Reopens the daemon logfile and all of the logfiles in the 'objs' list.
*/
ListIterator i;
obj_t *logfile;
i = list_iterator_create(conf->objs);
while ((logfile = list_next(i))) {
if (!is_logfile_obj(logfile)) {
continue;
}
open_logfile_obj(logfile);
}
list_iterator_destroy(i);
if (conf->logFileName && !conf->enableForeground) {
open_daemon_logfile(conf);
}
return;
}
static void accept_client(server_conf_t *conf)
{
/* Accepts a new client connection on the listening socket.
* The new socket connection must be accept()'d within the poll() loop.
* O/w, the following scenario could occur: Read activity would be
* poll()'d on the listen socket. A new thread would be created to
* process this request. Before this new thread is scheduled and the
* socket connection is accept()'d, the poll() loop begins its next
* iteration. It notices read activity on the listen socket from the
* client that has not yet been accepted, so a new thread is created.
* Since the listen socket is set non-blocking, this new thread would
* receive an EAGAIN/EWOULDBLOCK on the accept() and terminate, but still...
*/
int sd;
const int on = 1;
client_arg_t *args;