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fwknopd.c
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fwknopd.c
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/**
* \file server/fwknopd.c
*
* \brief An implementation of an fwknop server.
*
* Fwknop is developed primarily by the people listed in the file 'AUTHORS'.
* Copyright (C) 2009-2015 fwknop developers and contributors. For a full
* list of contributors, see the file 'CREDITS'.
*
* License (GNU General Public License):
*
* 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
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*
*****************************************************************************
*/
#include "fwknopd.h"
#include "access.h"
#include "config_init.h"
#include "log_msg.h"
#include "utils.h"
#include "fw_util.h"
#include "sig_handler.h"
#include "replay_cache.h"
#include "tcp_server.h"
#include "udp_server.h"
#if USE_LIBNETFILTER_QUEUE
#include "nfq_capture.h"
#endif
#if USE_LIBPCAP
#include "pcap_capture.h"
#endif
/* Prototypes
*/
static int check_dir_path(const char * const path,
const char * const path_name, const unsigned char use_basename);
static int make_dir_path(const char * const path);
static void daemonize_process(fko_srv_options_t * const opts);
static int stop_fwknopd(fko_srv_options_t * const opts);
static int status_fwknopd(fko_srv_options_t * const opts);
static int restart_fwknopd(fko_srv_options_t * const opts);
static int write_pid_file(fko_srv_options_t *opts);
static int handle_signals(fko_srv_options_t *opts);
static void setup_pid(fko_srv_options_t *opts);
static void init_digest_cache(fko_srv_options_t *opts);
static void set_locale(fko_srv_options_t *opts);
static pid_t get_running_pid(const fko_srv_options_t *opts);
#if AFL_FUZZING
static void afl_enc_pkt_from_file(fko_srv_options_t *opts);
static void afl_pkt_from_stdin(fko_srv_options_t *opts);
#endif
#if HAVE_LIBFIU
static void enable_fault_injections(fko_srv_options_t * const opts);
#endif
#if AFL_FUZZING
#define AFL_MAX_PKT_SIZE MAX_SPA_ENCODED_MSG_SIZE
#define AFL_DUMP_CTX_SIZE 4096
#endif
int
main(int argc, char **argv)
{
fko_srv_options_t opts;
int depth = 0;
while(1)
{
/* Handle command line
*/
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 our signal handlers. You can check the return value for
* the number of signals that were *not* set. Those that were not set
* will be listed in the log/stderr output.
*/
if(set_sig_handlers() > 0) {
log_msg(LOG_ERR, "Errors encountered when setting signal handlers.");
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");
opts.enable_fw = 1;
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.
*/
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
*/
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 USE_LIBNETFILTER_QUEUE
/* If we are to acquire SPA data via a libnetfilter_queue, start it up here.
*/
if(opts.enable_nfq_capture ||
strncasecmp(opts.config[CONF_ENABLE_NFQ_CAPTURE], "Y", 1) == 0)
{
nfq_capture(&opts);
}
else
#endif
/* If we are to acquire SPA data via a UDP socket, start it up here.
*/
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);
}
else
{
log_msg(LOG_ERR, "No available capture mode specified. Aborting.");
clean_exit(&opts, FW_CLEANUP, EXIT_FAILURE);
}
#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 */
}
static void set_locale(fko_srv_options_t *opts)
{
char *locale;
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
{
log_msg(LOG_INFO,
"Locale set to '%s'.", opts->config[CONF_LOCALE]
);
}
}
return;
}
#if AFL_FUZZING
static void afl_enc_pkt_from_file(fko_srv_options_t *opts)
{
FILE *fp = NULL;
fko_ctx_t decrypt_ctx = NULL;
unsigned char enc_spa_pkt[AFL_MAX_PKT_SIZE] = {0}, rc;
int res = 0, es = EXIT_SUCCESS, enc_msg_len;
char dump_buf[AFL_DUMP_CTX_SIZE];
fp = fopen(opts->config[CONF_AFL_PKT_FILE], "rb");
if(fp != NULL)
{
enc_msg_len = 0;
while(fread(&rc, 1, 1, fp))
{
enc_spa_pkt[enc_msg_len] = rc;
enc_msg_len++;
if(enc_msg_len == AFL_MAX_PKT_SIZE-2)
break;
}
fclose(fp);
enc_msg_len++;
fko_new(&decrypt_ctx);
res = fko_afl_set_spa_data(decrypt_ctx, (const char *)enc_spa_pkt,
enc_msg_len);
if(res == FKO_SUCCESS)
res = fko_decrypt_spa_data(decrypt_ctx, "fwknoptest",
strlen("fwknoptest"));
if(res == FKO_SUCCESS)
res = dump_ctx_to_buffer(decrypt_ctx, dump_buf, sizeof(dump_buf));
if(res == FKO_SUCCESS)
log_msg(LOG_INFO, "%s", dump_buf);
else
log_msg(LOG_ERR, "Error (%d): %s", res, fko_errstr(res));
fko_destroy(decrypt_ctx);
if(res == FKO_SUCCESS)
{
log_msg(LOG_INFO, "SPA packet decode: %s", fko_errstr(res));
es = EXIT_SUCCESS;
}
else
{
log_msg(LOG_ERR, "Could not decode SPA packet: %s", fko_errstr(res));
es = EXIT_FAILURE;
}
}
else
log_msg(LOG_ERR, "Could not acquire SPA packet from file: %s.",
opts->config[CONF_AFL_PKT_FILE]);
clean_exit(opts, NO_FW_CLEANUP, es);
}
static void afl_pkt_from_stdin(fko_srv_options_t *opts)
{
FILE *fp = NULL;
fko_ctx_t decode_ctx = NULL;
unsigned char spa_pkt[AFL_MAX_PKT_SIZE] = {0};
int res = 0, es = EXIT_SUCCESS;
char dump_buf[AFL_DUMP_CTX_SIZE];
fp = fdopen(STDIN_FILENO, "r");
if(fp != NULL)
{
if(fgets((char *)spa_pkt, AFL_MAX_PKT_SIZE, fp) == NULL)
{
fclose(fp);
clean_exit(opts, NO_FW_CLEANUP, EXIT_FAILURE);
}
fclose(fp);
fko_new(&decode_ctx);
res = fko_set_encoded_data(decode_ctx, (char *) spa_pkt,
strlen((char *)spa_pkt), 0, FKO_DIGEST_SHA256);
if(res == FKO_SUCCESS)
res = fko_set_spa_data(decode_ctx, (const char *) spa_pkt);
if(res == FKO_SUCCESS)
res = fko_decode_spa_data(decode_ctx);
if(res == FKO_SUCCESS)
res = dump_ctx_to_buffer(decode_ctx, dump_buf, sizeof(dump_buf));
if(res == FKO_SUCCESS)
log_msg(LOG_INFO, "%s", dump_buf);
fko_destroy(decode_ctx);
if(res == FKO_SUCCESS)
{
log_msg(LOG_INFO, "SPA packet decode: %s", fko_errstr(res));
es = EXIT_SUCCESS;
}
else
{
log_msg(LOG_ERR, "Could not decode SPA packet: %s", fko_errstr(res));
es = EXIT_FAILURE;
}
}
else
log_msg(LOG_ERR, "Could not acquire SPA packet from stdin.");
clean_exit(opts, NO_FW_CLEANUP, es);
}
#endif
static void init_digest_cache(fko_srv_options_t *opts)
{
int rp_cache_count;
#if AFL_FUZZING
if(opts->afl_fuzzing)
return;
#endif
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."
);
/* Destination points to heap memory, and is guaranteed to be
* at least two bytes large via validate_options(),
* DEF_ENABLE_DIGEST_PERSISTENCE, and set_config_entry()
*/
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
);
}
return;
}
static void setup_pid(fko_srv_options_t *opts)
{
pid_t old_pid;
#if AFL_FUZZING
if(opts->afl_fuzzing)
return;
#endif
/* 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, then 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
);
clean_exit(opts, NO_FW_CLEANUP, 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);
}
return;
}
static int restart_fwknopd(fko_srv_options_t * const opts)
{
int res = 0;
pid_t old_pid;
old_pid = get_running_pid(opts);
if(old_pid > 0)
{
res = kill(old_pid, SIGHUP);
if(res == 0)
{
fprintf(stdout, "Sent restart signal to fwknopd (pid=%i)\n", old_pid);
return EXIT_SUCCESS;
}
else
{
perror("Unable to send signal to fwknop: ");
return EXIT_FAILURE;
}
}
fprintf(stdout, "No running fwknopd detected.\n");
return EXIT_FAILURE;
}
static int status_fwknopd(fko_srv_options_t * const opts)
{
pid_t old_pid;
old_pid = write_pid_file(opts);
if(old_pid > 0)
{
fprintf(stdout, "Detected fwknopd is running (pid=%i).\n", old_pid);
return EXIT_SUCCESS;
}
fprintf(stdout, "No running fwknopd detected.\n");
return EXIT_FAILURE;
}
static int handle_signals(fko_srv_options_t *opts)
{
int last_sig = 0, rv = 1;
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);
if(opts->tcp_server_pid > 0)
kill(opts->tcp_server_pid, SIGTERM);
usleep(1000000);
got_sighup = 0;
rv = 0; /* this means fwknopd will not exit */
}
else if(got_sigint)
{
log_msg(LOG_WARNING, "Got SIGINT. Exiting...");
got_sigint = 0;
}
else if(got_sigterm)
{
log_msg(LOG_WARNING, "Got SIGTERM. Exiting...");
got_sigterm = 0;
}
else
{
log_msg(LOG_WARNING,
"Got signal %i. No defined action but to exit.", last_sig);
}
}
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);
}
else /* got_signal was not set (should be if we are here) */
{
log_msg(LOG_WARNING,
"Capture ended without signal. Exiting...");
}
return rv;
}
static int stop_fwknopd(fko_srv_options_t * const opts)
{
int res = 0, is_err = 0, sleep_num = 0;
pid_t old_pid;
old_pid = get_running_pid(opts);
if(old_pid > 0)
{
res = kill(old_pid, SIGTERM);
is_err = kill(old_pid, 0);
if(res == 0 && is_err != 0)
{
fprintf(stdout, "Killed fwknopd (pid=%i)\n", old_pid);
return EXIT_SUCCESS;
}
else
{
/* give a bit of time for process shutdown and check again
*/
for (sleep_num = 0; sleep_num < 4; sleep_num++) {
is_err = kill(old_pid, 0);
if(is_err != 0)
{
fprintf(stdout, "Killed fwknopd (pid=%i) via SIGTERM\n",
old_pid);
return EXIT_SUCCESS;
}
sleep(1);
}
/* if we make it here at all, then we were unsuccessful with the
* above attempt to kill the process with SIGTERM
*/
res = kill(old_pid, SIGKILL);
is_err = kill(old_pid, 0);
if(res == 0 && is_err != 0)
{
fprintf(stdout,
"Killed fwknopd (pid=%i) via SIGKILL\n",
old_pid);
return EXIT_SUCCESS;
}
else
{
sleep(1);
is_err = kill(old_pid, 0);
if(is_err != 0)
{
fprintf(stdout,
"Killed fwknopd (pid=%i) via SIGKILL\n",
old_pid);
return EXIT_SUCCESS;
}
else
{
perror("Unable to kill fwknop: ");
return EXIT_FAILURE;
}
}
}
}
fprintf(stderr, "No running fwknopd detected.\n");
return EXIT_FAILURE;
}
/* Ensure the specified directory exists. If not, create it or die.
*/
static int
check_dir_path(const char * const filepath, const char * const fp_desc, const unsigned char use_basename)
{
struct stat st;
int res = 0;
char tmp_path[MAX_PATH_LEN];
char *ndx;
/*
* FIXME: We shouldn't use a hard-coded dir-separator here.
*/
/* But first make sure we are using an absolute path.
*/
if(*filepath != PATH_SEP)
{
log_msg(LOG_ERR,
"Path '%s' is not absolute.", filepath
);
return 0;
}
/* If this is a file path that we want to use only the basename, strip
* the trailing filename here.
*/
if(use_basename && ((ndx = strrchr(filepath, PATH_SEP)) != NULL))
strlcpy(tmp_path, filepath, (ndx-filepath)+1);
else
strlcpy(tmp_path, filepath, sizeof(tmp_path));
/* At this point, we should make the path is more than just the
* PATH_SEP. If it is not, silently return.
*/
if(strlen(tmp_path) < 2)
return 1;
/* Make sure we have a valid directory.
*/
res = stat(tmp_path, &st);
if(res != 0)
{
if(errno == ENOENT)
{
log_msg(LOG_WARNING,
"%s directory: %s does not exist. Attempting to create it.",
fp_desc, tmp_path
);
/* Directory does not exist, so attempt to create it.
*/
res = make_dir_path(tmp_path);
if(res != 0)
{
log_msg(LOG_ERR,
"Unable to create %s directory: %s (error: %i)",
fp_desc, tmp_path, errno
);
return 0;
}
log_msg(LOG_ERR,
"Successfully created %s directory: %s", fp_desc, tmp_path
);
}
else
{
log_msg(LOG_ERR,
"Stat of %s returned error %i", tmp_path, errno
);
return 0;
}
}
else
{
/* It is a file, but is it a directory?
*/
if(! S_ISDIR(st.st_mode))
{
log_msg(LOG_ERR,
"Specified %s directory: %s is NOT a directory", fp_desc, tmp_path
);
return 0;
}
}
return 1;
}
static int
make_dir_path(const char * const run_dir)
{
struct stat st;
int res = 0;
char tmp_path[MAX_PATH_LEN];
char *ndx;
strlcpy(tmp_path, run_dir, sizeof(tmp_path));
/* Strip any trailing dir sep char.
*/
chop_char(tmp_path, PATH_SEP);
for(ndx = tmp_path+1; *ndx; ndx++)
{
if(*ndx == '/')
{
*ndx = '\0';
/* Stat this part of the path to see if it is a valid directory.
* If it does not exist, attempt to create it. If it does, and
* it is a directory, go on. Otherwise, any other error cause it
* to bail.
*/
if(stat(tmp_path, &st) != 0)
{
if(errno == ENOENT)
{
res = mkdir(tmp_path, S_IRWXU);
if(res != 0)
return res;
/* run stat() against the component since we just
* created it
*/
if(stat(tmp_path, &st) != 0)
{
log_msg(LOG_ERR,
"Could not create component: %s of %s", tmp_path, run_dir
);
return(ENOTDIR);
}
}
}
if(! S_ISDIR(st.st_mode))
{
log_msg(LOG_ERR,
"Component: %s of %s is NOT a directory", tmp_path, run_dir
);
return(ENOTDIR);
}
*ndx = '/';
}
}
res = mkdir(tmp_path, S_IRWXU);
return(res);
}
/* Become a daemon: fork(), start a new session, chdir "/",
* and close unneeded standard filehandles.
*/
static void
daemonize_process(fko_srv_options_t * const opts)
{
pid_t pid, old_pid;
/* Reset the our umask
*/
umask(0);
if ((pid = fork()) < 0)
{
perror("Unable to fork: ");
clean_exit(opts, NO_FW_CLEANUP, EXIT_FAILURE);
}
else if (pid != 0) /* parent */
{
clean_exit(opts, NO_FW_CLEANUP, EXIT_SUCCESS);
}
/* Child process from here on out */
/* Start a new session
*/
setsid();
/* Create the PID file (or be blocked by an existing one).
*/
old_pid = write_pid_file(opts);
if(old_pid > 0)
{
fprintf(stderr,
"[*] An instance of fwknopd is already running: (PID=%i).\n", old_pid
);
clean_exit(opts, NO_FW_CLEANUP, EXIT_FAILURE);
}
else if(old_pid < 0)
{
fprintf(stderr,
"[*] PID file error. The lock may not be effective.\n");
}
/* Chdir to the root of the filesystem
*/
if ((chdir("/")) < 0) {
perror("Could not chdir() to /: ");
clean_exit(opts, NO_FW_CLEANUP, EXIT_FAILURE);
}
/* Close un-needed file handles
*/
close(STDIN_FILENO);
close(STDOUT_FILENO);
close(STDERR_FILENO);
return;
}
static int
write_pid_file(fko_srv_options_t *opts)
{
pid_t old_pid, my_pid;
int op_fd, lck_res, num_bytes;
char buf[PID_BUFLEN] = {0};
/* Reset errno (just in case)
*/
errno = 0;
/* Open the PID file
*/
op_fd = open(
opts->config[CONF_FWKNOP_PID_FILE], O_WRONLY|O_CREAT, S_IRUSR|S_IWUSR
);
if(op_fd == -1)
{
perror("Error trying to open PID file: ");
return -1;
}
if(fcntl(op_fd, F_SETFD, FD_CLOEXEC) == -1)
{
close(op_fd);
perror("Unexpected error from fcntl: ");
return -1;
}
/* Attempt to lock the PID file. If we get an EWOULDBLOCK
* error, another instance already has the lock. So we grab
* the pid from the existing lock file, complain and bail.
*/
lck_res = lockf(op_fd, F_TLOCK, 0);
if(lck_res == -1)
{
close(op_fd);
if(errno != EAGAIN)
{
perror("Unexpected error from lockf: ");
return -1;
}
/* Look for an existing lock holder. If we get a pid return it.
*/
old_pid = get_running_pid(opts);
if(old_pid)
return old_pid;
/* Otherwise, consider it an error.
*/
perror("Unable read existing PID file: ");
return -1;
}
/* Write our PID to the file
*/
my_pid = getpid();
snprintf(buf, PID_BUFLEN, "%i\n", my_pid);
log_msg(LOG_DEBUG, "[+] Writing my PID (%i) to the lock file: %s",
my_pid, opts->config[CONF_FWKNOP_PID_FILE]);
num_bytes = write(op_fd, buf, strlen(buf));
if(errno || num_bytes != strlen(buf))
perror("Lock may not be valid. PID file write error: ");
/* Sync/flush regardless...
*/