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/*
*****************************************************************************
*
* File: psadwatchd.c
*
* Purpose: psadwatchd checks on an interval of every five seconds to make
* sure that both kmsgsd and psad are running on the box. If
* either daemon has died, psadwatchd will restart it and notify
* each email address in @email_addresses that the daemon has been
* restarted.
*
* Author: Michael Rash (mbr@cipherdyne.org)
*
* Credits: (see the CREDITS file)
*
* Copyright (C) 1999-2007 Michael Rash (mbr@cipherdyne.org)
*
* License (GNU Public License):
*
* 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
*
*****************************************************************************
*/
/* includes */
#include "psad.h"
/* defines */
#define CONFIG_FILE "/etc/psad/psad.conf" /* only used for DATA_INPUT_METHOD */
/* Maximum number of overwrite files allowed on the command line */
#define MAX_OVW_FILES 3
/* globals */
short int psad_syscalls_ctr = 0;
short int kmsgsd_syscalls_ctr = 0;
unsigned short int no_email = 0;
unsigned short int check_kmsgsd;
const char mail_redr[] = " < /dev/null > /dev/null 2>&1";
char hostname[MAX_GEN_LEN];
char mail_addrs[MAX_EMAIL_LEN];
char shCmd[MAX_GEN_LEN];
char mailCmd[MAX_GEN_LEN];
char alerting_methods[MAX_GEN_LEN];
char psadCmd[MAX_PATH_LEN];
char install_root[MAX_PATH_LEN];
char psad_pid_file[MAX_PATH_LEN];
char psad_cmdline_file[MAX_PATH_LEN];
char psad_run_dir[MAX_PATH_LEN];
char kmsgsdCmd[MAX_PATH_LEN];
char kmsgsd_pid_file[MAX_PATH_LEN];
char psadwatchd_pid_file[MAX_PATH_LEN];
char data_input_mode[MAX_GEN_LEN];
char enable_syslog_file[MAX_GEN_LEN];
char char_psadwatchd_check_interval[MAX_NUM_LEN];
char char_psadwatchd_max_retries[MAX_NUM_LEN];
unsigned int psadwatchd_check_interval;
unsigned int psadwatchd_max_retries;
static volatile sig_atomic_t received_sighup = 0;
unsigned char dump_cfg;
/* prototypes */
static void usage(void);
static void clean_settings(void);
static void parse_config(char *file);
static void check_config(void);
static void dump_config(void);
static unsigned short int is_kmsgsd_required(void);
static void expand_config_vars(void);
static void find_sub_var_value(
char *value,
char *sub_var,
char *pre_str,
char *post_str
);
static void check_process(
const char *pid_name,
const char *pid_file,
const char *cmdline_file,
const char *binary_path,
unsigned int max_retries
);
static void incr_syscall_ctr(const char *pid_name, unsigned int max_retries);
static void reset_syscall_ctr(const char *pid_name);
static void give_up(const char *pid_name);
static void exec_binary(const char *binary_path, const char *cmdline_file);
static void sighup_handler(int sig);
/* main */
int main(int argc, char *argv[]) {
int cmdlopt;
char **ovw_file_ptr;
char *overwrite_files[MAX_OVW_FILES+1];
char overwrite_cmd[MAX_PATH_LEN];
char config_file[MAX_PATH_LEN];
#ifdef DEBUG
fprintf(stderr, "[+] Entering DEBUG mode\n");
sleep(1);
#endif
overwrite_files[0] = NULL;
strlcpy(config_file, CONFIG_FILE, MAX_PATH_LEN);
dump_cfg = 0;
while((cmdlopt = getopt(argc, argv, "c:O:Dh")) != -1) {
switch(cmdlopt) {
case 'c':
strlcpy(config_file, optarg, MAX_PATH_LEN);
break;
case 'O':
strlcpy(overwrite_cmd, optarg, MAX_PATH_LEN);
list_to_array(overwrite_cmd, ',', overwrite_files, MAX_OVW_FILES);
break;
case 'D':
dump_cfg = 1;
break;
default:
usage();
}
}
/* clean our settings */
clean_settings();
/* Parse both the overwrite and configuration file */
for (ovw_file_ptr=overwrite_files; *ovw_file_ptr!=NULL; ovw_file_ptr++)
parse_config(*ovw_file_ptr);
parse_config(config_file);
/* Check our settings */
check_config();
if (dump_cfg == 1)
dump_config();
/* see if we are suppose to disable all email alerts */
if (strncmp("noemail", alerting_methods, MAX_GEN_LEN) == 0)
no_email = 1;
/* first make sure there isn't another psadwatchd already running */
check_unique_pid(psadwatchd_pid_file, "psadwatchd");
#ifndef DEBUG
/* become a daemon */
daemonize_process(psadwatchd_pid_file);
#endif
/* install signal handler for HUP signals */
signal(SIGHUP, sighup_handler);
/* start doing the real work now that the daemon is running and
* the config file has been processed */
/* MAIN LOOP */
for (;;) {
/* restart processes as necessary */
check_process("psad", psad_pid_file, psad_cmdline_file,
psadCmd, psadwatchd_max_retries);
if (check_kmsgsd)
check_process("kmsgsd", kmsgsd_pid_file, NULL,
kmsgsdCmd, psadwatchd_max_retries);
/* sleep and then check to see if we received any signals */
sleep(psadwatchd_check_interval);
/* check for sighup */
if (received_sighup) {
slogr("psad(psadwatchd)", "received HUP signal");
received_sighup = 0;
/* clean our settings */
clean_settings();
/* reparse the config file since we received a HUP signal */
for (ovw_file_ptr=overwrite_files; *ovw_file_ptr!=NULL; ovw_file_ptr++)
parse_config(*ovw_file_ptr);
parse_config(config_file);
check_config();
}
}
/* this statement doesn't get executed, but for completeness... */
exit(EXIT_SUCCESS);
}
/******************** end main ********************/
static void check_process(
const char *pid_name,
const char *pid_file,
const char *cmdline_file,
const char *binary_path,
unsigned int max_retries)
{
FILE *pidfile_ptr;
pid_t pid;
unsigned short int restart = 0;
char mail_str[MAX_MSG_LEN] = "";
char syslog_str[MAX_MSG_LEN] = "";
char pid_line[MAX_PID_SIZE];
if ((pidfile_ptr = fopen(pid_file, "r")) == NULL) {
#ifdef DEBUG
fprintf(stderr, "[-] Could not open pid file: %s\n", pid_file);
#endif
snprintf(syslog_str, MAX_MSG_LEN,
"could not open pid file: %s on %s", pid_file, hostname);
slogr("psad(psadwatchd)", syslog_str);
/* the pid file must not exist (or we can't read it), so
* setup to start the appropriate process */
restart = 1;
}
/* read the first line of the pid_file, which will contain the
* process id of any running pid_name process. */
if (! restart) {
if (fgets(pid_line, MAX_PID_SIZE, pidfile_ptr) == NULL) {
#ifdef DEBUG
fprintf(stderr, "[-] Could not read the pid file: %s\n",
pid_file);
#endif
fclose(pidfile_ptr);
snprintf(syslog_str, MAX_MSG_LEN,
"could not read pid file: %s on %s", pid_file, hostname);
slogr("psad(psadwatchd)", syslog_str);
/* see if we need to give up */
incr_syscall_ctr(pid_name, max_retries);
return;
}
/* close the pid_file now that we have read it */
fclose(pidfile_ptr);
if (pid_line[strlen(pid_line)] == '\n')
pid_line[strlen(pid_line)] = '\0';
/* convert the pid_line into an integer */
pid = atoi(pid_line);
if (kill(pid, 0) != 0) {
/* the process is not running so start it */
restart = 1;
}
}
if (restart) {
#ifdef DEBUG
fprintf(stderr, "[+] executing exec_binary(%s)\n", binary_path);
#endif
//strlcat(mail_str, mailCmd, MAX_MSG_LEN);
strlcat(mail_str, " -s \"[*] psadwatchd: Restarting ", MAX_MSG_LEN);
strlcat(mail_str, pid_name, MAX_MSG_LEN);
strlcat(mail_str, " on ", MAX_MSG_LEN);
strlcat(mail_str, hostname, MAX_MSG_LEN);
strlcat(mail_str, "\" ", MAX_MSG_LEN);
strlcat(mail_str, mail_addrs, MAX_MSG_LEN);
strlcat(mail_str, mail_redr, MAX_MSG_LEN);
#ifdef DEBUG
fprintf(stderr, "sending mail: %s\n", mail_str);
#endif
snprintf(syslog_str, MAX_MSG_LEN,
"restarting %s on %s", pid_name, hostname);
slogr("psad(psadwatchd)", syslog_str);
if (! no_email) {
/* send the email */
send_alert_email(shCmd, mailCmd, mail_str);
}
/* execute the binary_path psad daemon */
exec_binary(binary_path, cmdline_file);
/* increment the number of times we have tried to restart the binary */
incr_syscall_ctr(pid_name, max_retries);
} else {
#ifdef DEBUG
fprintf(stderr, "[+] %s is running.\n", pid_name);
#endif
/* reset the syscall counter since the process is successfully
* running. */
reset_syscall_ctr(pid_name);
}
return;
}
static void incr_syscall_ctr(const char *pid_name, unsigned int max_retries)
{
if (strncmp("psad", pid_name, MAX_PATH_LEN) == 0) {
psad_syscalls_ctr++;
#ifdef DEBUG
fprintf(stderr,
"[-] %s not running. Trying to restart (%d tries so far).\n",
pid_name, psad_syscalls_ctr);
#endif
if (psad_syscalls_ctr >= max_retries)
give_up(pid_name);
} else if (strncmp("kmsgsd", pid_name, MAX_PATH_LEN) == 0) {
kmsgsd_syscalls_ctr++;
#ifdef DEBUG
fprintf(stderr,
"[-] %s not running. Trying to restart (%d tries so far).\n",
pid_name, kmsgsd_syscalls_ctr);
#endif
if (kmsgsd_syscalls_ctr >= max_retries)
give_up(pid_name);
}
return;
}
static void reset_syscall_ctr(const char *pid_name)
{
if (strncmp("psad", pid_name, MAX_PATH_LEN) == 0) {
psad_syscalls_ctr = 0;
} else if (strncmp("kmsgsd", pid_name, MAX_PATH_LEN) == 0) {
kmsgsd_syscalls_ctr = 0;
}
return;
}
static void give_up(const char *pid_name)
{
char mail_str[MAX_MSG_LEN] = "";
#ifdef DEBUG
fprintf(stderr, "[*] Could not restart %s process. Exiting.\n", pid_name);
#endif
strlcat(mail_str, " -s \"[*] psadwatchd: Could not restart ", MAX_MSG_LEN);
strlcat(mail_str, pid_name, MAX_MSG_LEN);
strlcat(mail_str, " on ", MAX_MSG_LEN);
strlcat(mail_str, hostname, MAX_MSG_LEN);
strlcat(mail_str, ". Exiting.\" ", MAX_MSG_LEN);
strlcat(mail_str, mail_addrs, MAX_MSG_LEN);
strlcat(mail_str, mail_redr, MAX_MSG_LEN);
if (! no_email) {
/* Send the email */
send_alert_email(shCmd, mailCmd, mail_str);
}
exit(EXIT_FAILURE);
}
static void exec_binary(const char *binary, const char *cmdlinefile)
{
FILE *cmdline_ptr;
char *prog_argv[MAX_ARG_LEN];
char cmdline_buf[MAX_LINE_BUF];
char *index;
pid_t child_pid;
int arg_num=0, non_ws, i;
prog_argv[arg_num] = (char *) safe_malloc(strlen(binary)+1);
strlcpy(prog_argv[arg_num], binary, strlen(binary)+1);
arg_num++;
if (cmdlinefile != NULL) {
/* restart binary with its command line arguments intact */
if ((cmdline_ptr = fopen(cmdlinefile, "r")) == NULL) {
exit(EXIT_FAILURE);
}
if ((fgets(cmdline_buf, MAX_LINE_BUF, cmdline_ptr)) == NULL) {
exit(EXIT_FAILURE);
}
fclose(cmdline_ptr);
/* initialize index to the beginning of the line */
index = cmdline_buf;
/* advance the index pointer through any whitespace
* at the beginning of the line */
while (*index == ' ' || *index == '\t') index++;
while (*index != '\n' && *index != '\0') {
non_ws = 0;
while (*index != ' ' && *index != '\t'
&& index != '\0' && *index != '\n') {
index++;
non_ws++;
}
if (arg_num >= MAX_ARG_LEN)
exit(EXIT_FAILURE);
prog_argv[arg_num] = (char *) safe_malloc(non_ws+1);
for (i=0; i<non_ws; i++)
prog_argv[arg_num][i] = *(index - (non_ws - i));
prog_argv[arg_num][i] = '\0';
arg_num++;
/* get past any whitespace */
while (*index == ' ' || *index == '\t') index++;
}
}
if (arg_num >= MAX_ARG_LEN)
exit(EXIT_FAILURE);
prog_argv[arg_num] = NULL;
if ((child_pid = fork()) < 0)
/* could not fork */
exit(EXIT_FAILURE);
else if (child_pid > 0) {
wait(NULL);
for (i=0; i<=arg_num; i++) {
free(prog_argv[i]);
}
} else {
#ifdef DEBUG
fprintf(stderr, "[+] restarting %s\n", binary);
#endif
execve(binary, prog_argv, NULL); /* don't use environment */
}
return;
}
static void parse_config(char * file)
{
FILE *config_ptr; /* FILE pointer to the config file */
int linectr = 0;
char config_buf[MAX_LINE_BUF];
char *index;
int tmp;
#ifdef DEBUG
fprintf(stderr, "[+] Parsing file %s\n", file);
#endif
if ((config_ptr = fopen(file, "r")) == NULL) {
perror("[*] Could not open config file");
exit(EXIT_FAILURE);
}
/* increment through each line of the config file */
while ((fgets(config_buf, MAX_LINE_BUF, config_ptr)) != NULL) {
linectr++;
index = config_buf; /* set the index pointer to the
beginning of the line */
/* advance the index pointer through any whitespace
* at the beginning of the line */
while (*index == ' ' || *index == '\t') index++;
/* skip comments and blank lines, etc. */
if ((*index != '#') && (*index != '\n') &&
(*index != ';') && (index != NULL)) {
find_char_var("HOSTNAME", hostname, index);
find_char_var("INSTALL_ROOT", install_root, index);
find_char_var("PSAD_RUN_DIR", psad_run_dir, index);
find_char_var("PSAD_PID_FILE", psad_pid_file, index);
find_char_var("PSAD_CMDLINE_FILE", psad_cmdline_file, index);
find_char_var("ALERTING_METHODS", alerting_methods, index);
find_char_var("KMSGSD_PID_FILE", kmsgsd_pid_file, index);
find_char_var("PSADWATCHD_PID_FILE", psadwatchd_pid_file, index);
find_char_var("PSADWATCHD_CHECK_INTERVAL",
char_psadwatchd_check_interval, index);
find_char_var("PSADWATCHD_MAX_RETRIES",
char_psadwatchd_max_retries, index);
find_char_var("SYSLOG_DAEMON", data_input_mode, index);
find_char_var("ENABLE_SYSLOG_FILE", enable_syslog_file, index);
find_char_var("EMAIL_ADDRESSES", mail_addrs, index);
/* commands */
find_char_var("kmsgsdCmd", kmsgsdCmd, index);
find_char_var("mailCmd", mailCmd, index);
find_char_var("shCmd", shCmd, index);
find_char_var("psadCmd", psadCmd, index);
}
}
fclose(config_ptr);
tmp = atoi(char_psadwatchd_check_interval);
if (tmp != 0)
psadwatchd_check_interval = tmp;
tmp = atoi(char_psadwatchd_max_retries);
if (tmp != 0)
psadwatchd_max_retries = tmp;
return;
}
static void expand_config_vars(void)
{
char sub_var[MAX_GEN_LEN] = "";
char pre_str[MAX_GEN_LEN] = "";
char post_str[MAX_GEN_LEN] = "";
int found_sub_var = 1, resolve_ctr = 0;
while (found_sub_var) {
resolve_ctr++;
if (resolve_ctr >= 20) {
fprintf(stderr, "[*] Exceeded maximum variable resolution attempts.\n");
exit(EXIT_FAILURE);
}
found_sub_var = 0;
if (has_sub_var("EMAIL_ADDRESSES", mail_addrs, sub_var,
pre_str, post_str)) {
find_sub_var_value(mail_addrs, sub_var, pre_str, post_str);
found_sub_var = 1;
}
if (has_sub_var("HOSTNAME", hostname, sub_var,
pre_str, post_str)) {
find_sub_var_value(hostname, sub_var, pre_str, post_str);
found_sub_var = 1;
}
if (has_sub_var("PSAD_RUN_DIR", psad_run_dir, sub_var,
pre_str, post_str)) {
find_sub_var_value(psad_run_dir, sub_var, pre_str, post_str);
found_sub_var = 1;
}
if (has_sub_var("INSTALL_ROOT", install_root, sub_var,
pre_str, post_str)) {
find_sub_var_value(install_root, sub_var, pre_str, post_str);
found_sub_var = 1;
}
if (has_sub_var("PSAD_PID_FILE", psad_pid_file, sub_var,
pre_str, post_str)) {
find_sub_var_value(psad_pid_file, sub_var, pre_str, post_str);
found_sub_var = 1;
}
if (has_sub_var("PSAD_CMDLINE_FILE", psad_cmdline_file, sub_var,
pre_str, post_str)) {
find_sub_var_value(psad_cmdline_file, sub_var, pre_str, post_str);
found_sub_var = 1;
}
if (has_sub_var("KMSGSD_PID_FILE", kmsgsd_pid_file, sub_var,
pre_str, post_str)) {
find_sub_var_value(kmsgsd_pid_file, sub_var, pre_str, post_str);
found_sub_var = 1;
}
if (has_sub_var("PSADWATCHD_PID_FILE", psadwatchd_pid_file, sub_var,
pre_str, post_str)) {
find_sub_var_value(psadwatchd_pid_file, sub_var, pre_str, post_str);
found_sub_var = 1;
}
if (has_sub_var("PSADWATCHD_CHECK_INTERVAL",
char_psadwatchd_check_interval, sub_var,
pre_str, post_str)) {
find_sub_var_value(char_psadwatchd_check_interval,
sub_var, pre_str, post_str);
found_sub_var = 1;
}
if (has_sub_var("PSADWATCHD_MAX_RETRIES", char_psadwatchd_max_retries,
sub_var, pre_str, post_str)) {
find_sub_var_value(char_psadwatchd_max_retries,
sub_var, pre_str, post_str);
found_sub_var = 1;
}
if (has_sub_var("mailCmd", mailCmd, sub_var,
pre_str, post_str)) {
find_sub_var_value(mailCmd, sub_var, pre_str, post_str);
found_sub_var = 1;
}
if (has_sub_var("shCmd", shCmd, sub_var,
pre_str, post_str)) {
find_sub_var_value(shCmd, sub_var, pre_str, post_str);
found_sub_var = 1;
}
if (has_sub_var("kmsgsdCmd", kmsgsdCmd, sub_var,
pre_str, post_str)) {
find_sub_var_value(kmsgsdCmd, sub_var, pre_str, post_str);
found_sub_var = 1;
}
if (has_sub_var("psadCmd", psadCmd, sub_var,
pre_str, post_str)) {
find_sub_var_value(psadCmd, sub_var, pre_str, post_str);
found_sub_var = 1;
}
}
return;
}
static void find_sub_var_value(char *value, char *sub_var, char *pre_str,
char *post_str)
{
int found_var = 0;
if (strncmp(sub_var, "EMAIL_ADDRESSES", MAX_GEN_LEN) == 0) {
strlcpy(sub_var, mail_addrs, MAX_GEN_LEN);
found_var = 1;
} else if (strncmp(sub_var, "HOSTNAME", MAX_GEN_LEN) == 0) {
strlcpy(sub_var, hostname, MAX_GEN_LEN);
found_var = 1;
} else if (strncmp(sub_var, "INSTALL_ROOT", MAX_GEN_LEN) == 0) {
strlcpy(sub_var, install_root, MAX_GEN_LEN);
found_var = 1;
} else if (strncmp(sub_var, "PSAD_RUN_DIR", MAX_GEN_LEN) == 0) {
strlcpy(sub_var, psad_run_dir, MAX_GEN_LEN);
found_var = 1;
} else if (strncmp(sub_var, "PSAD_PID_FILE", MAX_GEN_LEN) == 0) {
strlcpy(sub_var, psad_pid_file, MAX_GEN_LEN);
found_var = 1;
} else if (strncmp(sub_var, "PSAD_CMDLINE_FILE", MAX_GEN_LEN) == 0) {
strlcpy(sub_var, psad_cmdline_file, MAX_GEN_LEN);
found_var = 1;
} else if (strncmp(sub_var, "KMSGSD_PID_FILE", MAX_GEN_LEN) == 0) {
strlcpy(sub_var, kmsgsd_pid_file, MAX_GEN_LEN);
found_var = 1;
} else if (strncmp(sub_var, "PSADWATCHD_PID_FILE", MAX_GEN_LEN) == 0) {
strlcpy(sub_var, psadwatchd_pid_file, MAX_GEN_LEN);
found_var = 1;
} else if (strncmp(sub_var, "PSADWATCHD_CHECK_INTERVAL", MAX_GEN_LEN) == 0) {
strlcpy(sub_var, char_psadwatchd_check_interval, MAX_GEN_LEN);
found_var = 1;
} else if (strncmp(sub_var, "PSADWATCHD_MAX_RETRIES", MAX_GEN_LEN) == 0) {
strlcpy(sub_var, char_psadwatchd_max_retries, MAX_GEN_LEN);
found_var = 1;
} else if (strncmp(sub_var, "mailCmd", MAX_GEN_LEN) == 0) {
strlcpy(sub_var, mailCmd, MAX_GEN_LEN);
found_var = 1;
} else if (strncmp(sub_var, "shCmd", MAX_GEN_LEN) == 0) {
strlcpy(sub_var, shCmd, MAX_GEN_LEN);
found_var = 1;
} else if (strncmp(sub_var, "kmsgsdCmd", MAX_GEN_LEN) == 0) {
strlcpy(sub_var, kmsgsdCmd, MAX_GEN_LEN);
found_var = 1;
} else if (strncmp(sub_var, "psadCmd", MAX_GEN_LEN) == 0) {
strlcpy(sub_var, psadCmd, MAX_GEN_LEN);
found_var = 1;
}
if (found_var)
/* substitute the variable value */
expand_sub_var_value(value, sub_var, pre_str, post_str);
else {
fprintf(stderr, "[*] Could not resolve sub-var: %s to a value.\n",
sub_var);
exit(EXIT_FAILURE);
}
return;
}
static void check_config(void)
{
unsigned char err;
#ifdef DEBUG
fprintf(stderr, "[+] Checking configuration...\n");
#endif
err = 1;
if (psadwatchd_check_interval <= 0)
fprintf(stderr, "[*] PSADWATCHD_CHECK_INTERVAL must be > 0\n");
else if (psadwatchd_max_retries <= 0)
fprintf(stderr, "[*] PSADWATCHD_MAX_RETRIES must be > 0\n");
else if (mail_addrs[0] == '\0')
fprintf(stderr, "[*] Could not find EMAIL_ADDRESSES\n");
else if (hostname[0] == '\0')
fprintf(stderr, "[*] Could not find HOSTNAME\n");
else if (psad_run_dir[0] == '\0')
fprintf(stderr, "[*] Could not find PSAD_RUN_DIR\n");
else if (install_root[0] == '\0')
fprintf(stderr, "[*] Could not find INSTALL_ROOT\n");
else if (psad_pid_file[0] == '\0')
fprintf(stderr, "[*] Could not find PSAD_PID_FILE\n");
else if (psad_cmdline_file[0] == '\0')
fprintf(stderr, "[*] Could not find PSAD_CMDLINE_FILE\n");
else if (kmsgsd_pid_file[0] == '\0')
fprintf(stderr, "[*] Could not find KMSGD_PID_FILE\n");
else if (psadwatchd_pid_file[0] == '\0')
fprintf(stderr, "[*] Could not find PSADWATCHD_PID_FILE\n");
else if (mailCmd[0] == '\0')
fprintf(stderr, "[*] Could not find mailCmd\n");
else if (shCmd[0] == '\0')
fprintf(stderr, "[*] Could not find shCmd\n");
else if (kmsgsdCmd[0] == '\0')
fprintf(stderr, "[*] Could not find kmsgsdCmd\n");
else if (psadCmd[0] == '\0')
fprintf(stderr, "[*] Could not find psadCmd\n");
else if (alerting_methods[0] == '\0')
fprintf(stderr, "[*] Could not find ALERTING_METHODS\n");
else {
/* Resolve any embedded variables */
expand_config_vars();
/* Refresh the need to check kmsgsd */
check_kmsgsd = is_kmsgsd_required();
err = 0;
}
if (err == 1)
exit(EXIT_FAILURE);
}
static void clean_settings (void)
{
#ifdef DEBUG
fprintf(stderr, "[+] Cleaning settings\n");
#endif
/* Set the default values used by psadwatchd when trying to
* restart the psad and kmsgsd daemons (5s /10 times) */
psadwatchd_check_interval = 5;
psadwatchd_max_retries = 10;
*mail_addrs = '\0';
*hostname = '\0';
*install_root = '\0';
*psad_run_dir = '\0';
*psad_pid_file = '\0';
*psad_cmdline_file = '\0';
*kmsgsd_pid_file = '\0';
*psadwatchd_pid_file = '\0';
*mailCmd = '\0';
*shCmd = '\0';
*kmsgsdCmd = '\0';
*psadCmd = '\0';
*alerting_methods = '\0';
*data_input_mode = '\0';
*enable_syslog_file = '\0';
}
static void dump_config(void)
{
fprintf(stderr, "[+] dump_config()\n");
fprintf(stderr, " EMAIL_ADDRESSES: %s\n", mail_addrs);
fprintf(stderr, " HOSTNAME: %s\n", hostname);
fprintf(stderr, " INSTALL_ROOT: %s\n", install_root);
fprintf(stderr, " PSAD_RUN_DIR: %s\n", psad_run_dir);
fprintf(stderr, " PSAD_PID_FILE: %s\n", psad_pid_file);
fprintf(stderr, " PSAD_CMDLINE_FILE: %s\n", psad_cmdline_file);
fprintf(stderr, " KMSGSD_PID_FILE: %s\n", kmsgsd_pid_file);
fprintf(stderr, " ALERTING_METHODS: %s\n", alerting_methods);
fprintf(stderr, " PSADWATCHD_PID_FILE: %s\n", psadwatchd_pid_file);
fprintf(stderr, " PSADWATCHD_CHECK_INTERVAL: %u\n",
psadwatchd_check_interval);
fprintf(stderr, " PSADWATCHD_MAX_RETRIES: %u\n",
psadwatchd_max_retries);
fprintf(stderr, " kmsgsdCmd: %s\n", kmsgsdCmd);
fprintf(stderr, " mailCmd: %s\n", mailCmd);
fprintf(stderr, " shCmd: %s\n", shCmd);
fprintf(stderr, " psadCmd: %s\n", psadCmd);
exit(EXIT_SUCCESS);
}
static void sighup_handler(int sig)
{
received_sighup = 1;
}
/*
* Check to see if kmsgsd should not be running:
*
* - first check if we are using the ulog mode
* - then, if ENABLE_SYSLOG_FILE is enabled so psad is just parsing
* a file written to by syslog directly
*
* \return 0 if not required
* 1 otherwise
*/
static unsigned short int is_kmsgsd_required(void)
{
unsigned short int required;
if (strncmp(data_input_mode, "ulogd", MAX_GEN_LEN) == 0)
required = 0;
else if (strncmp(enable_syslog_file, "Y", 1) == 0)
required = 0;
else
required = 1;
return required;
}
/*
* Usage message to be displayed when -h option is supplied or a bad option
* is passed to the daemon. This function ends the execution of the program.
*/
static void usage (void)
{
fprintf(stderr, "psadwatchd - Psad watch daemon\n\n");
fprintf(stderr, "[+] Version: %s\n", PSAD_VERSION);
fprintf(stderr,
" By Michael Rash (mbr@cipherdyne.org)\n"
" URL: http://www.cipherdyne.org/psad/\n\n");
fprintf(stderr, "Usage: psadwatchd [options]\n\n");
fprintf(stderr,
"Options:\n"
" -c <file> - Specify path to config file instead of using the\n"
" default $config_file.\n"
" -D - Dump the configuration values that psad\n"
" derives from the /etc/psad/psad.conf (or other\n"
" override files) on STDERR\n"
" -h - Display this usage message and exit\n"
" -O <file> - Override config variable values that are normally\n"
" read from the /etc/psad/psad.conf file with\n"
" values from the specified file\n");
exit(EXIT_FAILURE);
}
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