int
main(int argc, char **argv)
{
int res, last_sig, rp_cache_count;
char *locale;
pid_t old_pid;
fko_srv_options_t opts;
while(1)
{
/* Handle command line
*/
config_init(&opts, argc, argv);
/* Process any options that do their thing and exit. */
/* Kill the currently running fwknopd?
*/
if(opts.kill == 1)
{
old_pid = get_running_pid(&opts);
if(old_pid > 0)
{
res = kill(old_pid, SIGTERM);
if(res == 0)
{
fprintf(stderr, "Killed fwknopd (pid=%i)\n", old_pid);
exit(EXIT_SUCCESS);
}
else
{
perror("Unable to kill fwknop: ");
exit(EXIT_FAILURE);
}
}
else
{
fprintf(stderr, "No running fwknopd detected.\n");
exit(EXIT_FAILURE);
}
}
/* Status of the currently running fwknopd?
*/
if(opts.status == 1)
{
old_pid = write_pid_file(&opts);
if(old_pid > 0)
fprintf(stderr, "Detected fwknopd is running (pid=%i).\n", old_pid);
else
fprintf(stderr, "No running fwknopd detected.\n");
exit(EXIT_SUCCESS);
}
/* Restart the currently running fwknopd?
*/
if(opts.restart == 1 || opts.status == 1)
{
old_pid = get_running_pid(&opts);
if(old_pid > 0)
{
res = kill(old_pid, SIGHUP);
if(res == 0)
{
fprintf(stderr, "Sent restart signal to fwknopd (pid=%i)\n", old_pid);
exit(EXIT_SUCCESS);
}
else
{
perror("Unable to send signal to fwknop: ");
exit(EXIT_FAILURE);
}
}
else
{
fprintf(stderr, "No running fwknopd detected.\n");
exit(EXIT_FAILURE);
}
}
/* Initialize logging.
*/
init_logging(&opts);
#if HAVE_LOCALE_H
/* Set the locale if specified.
*/
if(opts.config[CONF_LOCALE] != NULL
&& strncasecmp(opts.config[CONF_LOCALE], "NONE", 4) != 0)
{
locale = setlocale(LC_ALL, opts.config[CONF_LOCALE]);
if(locale == NULL)
{
log_msg(LOG_ERR,
"WARNING: Unable to set locale to '%s'.",
opts.config[CONF_LOCALE]
);
}
else
{
if(opts.verbose)
log_msg(LOG_INFO,
"Locale set to '%s'.", opts.config[CONF_LOCALE]
);
}
}
#endif
/* Make sure we have a valid run dir and path leading to digest file
* in case it configured to be somewhere other than the run dir.
*/
check_dir_path((const char *)opts.config[CONF_FWKNOP_RUN_DIR], "Run", 0);
#if USE_FILE_CACHE
check_dir_path((const char *)opts.config[CONF_DIGEST_FILE], "Run", 1);
#else
check_dir_path((const char *)opts.config[CONF_DIGEST_DB_FILE], "Run", 1);
#endif
/* Process the access.conf file.
*/
parse_access_file(&opts);
/* Show config (including access.conf vars) and exit dump config was
* wanted.
*/
if(opts.dump_config == 1)
{
dump_config(&opts);
dump_access_list(&opts);
exit(EXIT_SUCCESS);
}
/* Initialize the firewall rules handler based on the fwknopd.conf
* file, but (for iptables firewalls) don't flush any rules or create
* any chains yet. This allows us to dump the current firewall rules
* via fw_rules_dump() in --fw-list mode before changing around any rules
* of an existing fwknopd process.
*/
fw_config_init(&opts);
if(opts.fw_list == 1)
{
fw_dump_rules(&opts);
exit(EXIT_SUCCESS);
}
/* If we are a new process (just being started), proceed with normal
* start-up. Otherwise, we are here as a result of a signal sent to an
* existing process and we want to restart.
*/
if(get_running_pid(&opts) != getpid())
{
/* If foreground mode is not set, the fork off and become a daemon.
* Otherwise, attempt to get the pid file lock and go on.
*/
if(opts.foreground == 0)
{
daemonize_process(&opts);
}
else
{
old_pid = write_pid_file(&opts);
if(old_pid > 0)
{
fprintf(stderr,
"* An instance of fwknopd is already running: (PID=%i).\n", old_pid
);
exit(EXIT_FAILURE);
}
else if(old_pid < 0)
{
fprintf(stderr, "* PID file error. The lock may not be effective.\n");
}
}
log_msg(LOG_INFO, "Starting %s", MY_NAME);
}
else
{
log_msg(LOG_INFO, "Re-starting %s", MY_NAME);
}
if(opts.verbose > 1 && opts.foreground)
{
dump_config(&opts);
dump_access_list(&opts);
}
/* Initialize the digest cache for replay attack detection (either
* with dbm support or with the default simple cache file strategy)
* if so configured.
*/
if(strncasecmp(opts.config[CONF_ENABLE_DIGEST_PERSISTENCE], "Y", 1) == 0)
{
rp_cache_count = replay_cache_init(&opts);
if(rp_cache_count < 0)
{
log_msg(LOG_WARNING,
"Error opening digest cache file. Incoming digests will not be remembered."
);
strlcpy(opts.config[CONF_ENABLE_DIGEST_PERSISTENCE], "N", 2);
}
if(opts.verbose)
log_msg(LOG_ERR,
"Using Digest Cache: '%s' (entry count = %i)",
#if USE_FILE_CACHE
opts.config[CONF_DIGEST_FILE], rp_cache_count
#else
opts.config[CONF_DIGEST_DB_FILE], rp_cache_count
#endif
);
}
/* Prepare the firewall - i.e. flush any old rules and (for iptables)
* create fwknop chains.
*/
fw_initialize(&opts);
/* If the TCP server option was set, fire it up here.
*/
if(strncasecmp(opts.config[CONF_ENABLE_TCP_SERVER], "Y", 1) == 0)
{
if(atoi(opts.config[CONF_TCPSERV_PORT]) <= 0
|| atoi(opts.config[CONF_TCPSERV_PORT]) > 65535)
{
log_msg(LOG_WARNING,
"WARNING: ENABLE_TCP_SERVER is set, but TCPSERV_PORT is not valid. TCP server not started!"
);
}
else
{
run_tcp_server(&opts);
}
}
/* Intiate pcap capture mode...
*/
pcap_capture(&opts);
if(got_signal) {
last_sig = got_signal;
got_signal = 0;
if(got_sighup)
{
log_msg(LOG_WARNING, "Got SIGHUP. Re-reading configs.");
free_configs(&opts);
kill(opts.tcp_server_pid, SIGTERM);
usleep(1000000);
got_sighup = 0;
}
else if(got_sigint)
{
log_msg(LOG_WARNING, "Got SIGINT. Exiting...");
got_sigint = 0;
break;
}
else if(got_sigterm)
{
log_msg(LOG_WARNING, "Got SIGTERM. Exiting...");
got_sigterm = 0;
break;
}
else
{
log_msg(LOG_WARNING,
"Got signal %i. No defined action but to exit.", last_sig);
break;
}
}
else if (opts.packet_ctr_limit > 0
&& opts.packet_ctr >= opts.packet_ctr_limit)
{
log_msg(LOG_INFO,
"Packet count limit (%d) reached. Exiting...",
opts.packet_ctr_limit);
break;
}
else /* got_signal was not set (should be if we are here) */
{
log_msg(LOG_WARNING,
"Capture ended without signal. Exiting...");
break;
}
}
log_msg(LOG_INFO, "Shutting Down fwknopd.");
/* Kill the TCP server (if we have one running).
*/
if(opts.tcp_server_pid > 0)
{
log_msg(LOG_INFO, "Killing the TCP server (pid=%i)",
opts.tcp_server_pid);
kill(opts.tcp_server_pid, SIGTERM);
/* --DSS XXX: This seems to be necessary if the tcp server
* was restarted by this program. We need to
* investigate and fix this. For now, this works
* (it is kludgy, but does no harm afaik).
*/
kill(opts.tcp_server_pid, SIGKILL);
}
/* Other cleanup.
*/
fw_cleanup();
free_logging();
#if USE_FILE_CACHE
free_replay_list(&opts);
#endif
free_configs(&opts);
return(0);
}
int
main(int argc, char **argv)
{
fko_srv_options_t opts;
int depth = 0;
while(1)
{
/* Handle command line
*/
//处理启动参数。
config_init(&opts, argc, argv);
#if HAVE_LIBFIU
/* Set any fault injection points early
*/
enable_fault_injections(&opts);
#endif
/* Process any options that do their thing and exit.
*/
/* Kill the currently running fwknopd process?
*/
if(opts.kill == 1)
clean_exit(&opts, NO_FW_CLEANUP, stop_fwknopd(&opts));
/* Status of the currently running fwknopd process?
*/
if(opts.status == 1)
clean_exit(&opts, NO_FW_CLEANUP, status_fwknopd(&opts));
/* Restart the currently running fwknopd process?
*/
if(opts.restart == 1)
clean_exit(&opts, NO_FW_CLEANUP, restart_fwknopd(&opts));
/* Initialize logging.
*/
init_logging(&opts);
/* Update the verbosity level for the log module */
log_set_verbosity(LOG_DEFAULT_VERBOSITY + opts.verbose);
#if HAVE_LOCALE_H
/* Set the locale if specified.
*/
set_locale(&opts);
#endif
/* Make sure we have a valid run dir and path leading to digest file
* in case it configured to be somewhere other than the run dir.
*/
if(!opts.afl_fuzzing
&& ! check_dir_path((const char *)opts.config[CONF_FWKNOP_RUN_DIR], "Run", 0))
clean_exit(&opts, NO_FW_CLEANUP, EXIT_FAILURE);
/* Initialize the firewall rules handler based on the fwknopd.conf
* file, but (for iptables firewalls) don't flush any rules or create
* any chains yet. This allows us to dump the current firewall rules
* via fw_rules_dump() in --fw-list mode before changing around any rules
* of an existing fwknopd process.
*/
if(fw_config_init(&opts) != 1)
clean_exit(&opts, NO_FW_CLEANUP, EXIT_FAILURE);
if(opts.fw_list == 1 || opts.fw_list_all == 1)
{
fw_dump_rules(&opts);
clean_exit(&opts, NO_FW_CLEANUP, EXIT_SUCCESS);
}
if(opts.fw_flush == 1)
{
fprintf(stdout, "Deleting any existing firewall rules...\n");
clean_exit(&opts, FW_CLEANUP, EXIT_SUCCESS);
}
if (opts.config[CONF_ACCESS_FOLDER] != NULL) //If we have an access folder, process it
{
if (parse_access_folder(&opts, opts.config[CONF_ACCESS_FOLDER], &depth) != EXIT_SUCCESS)
{
clean_exit(&opts, NO_FW_CLEANUP, EXIT_FAILURE);
}
}
/* Process the access.conf file, but only if no access.conf folder was specified.
*/
//读入access.conf中的数据。
else if (parse_access_file(&opts, opts.config[CONF_ACCESS_FILE], &depth) != EXIT_SUCCESS)
{
clean_exit(&opts, NO_FW_CLEANUP, EXIT_FAILURE);
}
/* We must have at least one valid access stanza at this point
*/
//检查有没有合法的stanza。
if(! valid_access_stanzas(opts.acc_stanzas))
{
log_msg(LOG_ERR, "Fatal, could not find any valid access.conf stanzas");
clean_exit(&opts, NO_FW_CLEANUP, EXIT_FAILURE);
}
/* Show config (including access.conf vars) and exit dump config was
* wanted.
*/
if(opts.dump_config == 1)
{
dump_config(&opts);
dump_access_list(&opts);
clean_exit(&opts, NO_FW_CLEANUP, EXIT_SUCCESS);
}
/* Now is the right time to bail if we're just parsing the configs
*/
if(opts.exit_after_parse_config)
{
log_msg(LOG_INFO, "Configs parsed, exiting.");
clean_exit(&opts, NO_FW_CLEANUP, EXIT_SUCCESS);
}
/* Acquire pid, become a daemon or run in the foreground, write pid
* to pid file.
*/
if(! opts.exit_parse_digest_cache)
setup_pid(&opts);
if(opts.verbose > 1 && opts.foreground)
{
dump_config(&opts);
dump_access_list(&opts);
}
/* Initialize the digest cache for replay attack detection (either
* with dbm support or with the default simple cache file strategy)
* if so configured.
*/
init_digest_cache(&opts);
if(opts.exit_parse_digest_cache)
{
log_msg(LOG_INFO, "Digest cache parsed, exiting.");
clean_exit(&opts, NO_FW_CLEANUP, EXIT_SUCCESS);
}
#if AFL_FUZZING
/* SPA data from STDIN. */
if(opts.afl_fuzzing)
{
if(opts.config[CONF_AFL_PKT_FILE] != 0x0)
{
afl_enc_pkt_from_file(&opts);
}
else
{
afl_pkt_from_stdin(&opts);
}
}
#endif
/* Prepare the firewall - i.e. flush any old rules and (for iptables)
* create fwknop chains.
*/
if(!opts.test && opts.enable_fw && (fw_initialize(&opts) != 1))
clean_exit(&opts, FW_CLEANUP, EXIT_FAILURE);
/* If we are to acquire SPA data via a UDP socket, start it up here.
*/
//启动UDP监听。
if(opts.enable_udp_server ||
strncasecmp(opts.config[CONF_ENABLE_UDP_SERVER], "Y", 1) == 0)
{
if(run_udp_server(&opts) < 0)
{
log_msg(LOG_ERR, "Fatal run_udp_server() error");
clean_exit(&opts, FW_CLEANUP, EXIT_FAILURE);
}
else
{
break;
}
}
/* If the TCP server option was set, fire it up here. Note that in
* this mode, fwknopd still acquires SPA packets via libpcap. If you
* want to use UDP only without the libpcap dependency, then fwknop
* needs to be compiled with --enable-udp-server. Note that the UDP
* server can be run even when fwknopd links against libpcap as well,
* but there is no reason to link against it if SPA packets are
* always going to be acquired via a UDP socket.
*/
if(strncasecmp(opts.config[CONF_ENABLE_TCP_SERVER], "Y", 1) == 0)
{
if(run_tcp_server(&opts) < 0)
{
log_msg(LOG_ERR, "Fatal run_tcp_server() error");
clean_exit(&opts, FW_CLEANUP, EXIT_FAILURE);
}
}
#if USE_LIBPCAP
/* Intiate pcap capture mode...
*/
if(!opts.enable_udp_server
&& strncasecmp(opts.config[CONF_ENABLE_UDP_SERVER], "N", 1) == 0)
{
pcap_capture(&opts);
}
#endif
/* Deal with any signals that we've received and break out
* of the loop for any terminating signals
*/
if(handle_signals(&opts) == 1)
break;
}
log_msg(LOG_INFO, "Shutting Down fwknopd.");
/* Kill the TCP server (if we have one running).
*/
if(opts.tcp_server_pid > 0)
{
log_msg(LOG_INFO, "Killing the TCP server (pid=%i)",
opts.tcp_server_pid);
kill(opts.tcp_server_pid, SIGTERM);
/* --DSS XXX: This seems to be necessary if the tcp server
* was restarted by this program. We need to
* investigate and fix this. For now, this works
* (it is kludgy, but does no harm afaik).
*/
kill(opts.tcp_server_pid, SIGKILL);
}
clean_exit(&opts, FW_CLEANUP, EXIT_SUCCESS);
return(EXIT_SUCCESS); /* This never gets called */
}