/******************************************************************************
* *
* Function: zbx_child_fork *
* *
* Purpose: fork from master process and set SIGCHLD handler *
* *
* Return value: same as system fork() function *
* *
* Author: Rudolfs Kreicbergs *
* *
* Comments: use this function only for forks from the main process *
* *
******************************************************************************/
int zbx_child_fork()
{
pid_t pid;
pid = zbx_fork();
/* ignore SIGCHLD to avoid problems with exiting scripts in zbx_execute() and other cases */
if (0 == pid)
signal(SIGCHLD, SIG_DFL);
return pid;
}
/******************************************************************************
* *
* Function: zbx_popen *
* *
* Purpose: this function opens a process by creating a pipe, forking, *
* and invoking the shell *
* *
* Parameters: pid - [OUT] child process PID *
* command - [IN] a pointer to a null-terminated string *
* containing a shell command line *
* *
* Return value: on success, reading file descriptor is returned. On error, *
* -1 is returned, and errno is set appropriately *
* *
* Author: Alexander Vladishev *
* *
******************************************************************************/
static int zbx_popen(pid_t *pid, const char *command)
{
const char *__function_name = "zbx_popen";
int fd[2];
zabbix_log(LOG_LEVEL_DEBUG, "In %s() command:'%s'", __function_name, command);
if (-1 == pipe(fd))
return -1;
if (-1 == (*pid = zbx_fork()))
{
close(fd[0]);
close(fd[1]);
return -1;
}
if (0 != *pid) /* parent process */
{
close(fd[1]);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%d", __function_name, fd[0]);
return fd[0];
}
/* child process */
close(fd[0]);
dup2(fd[1], STDOUT_FILENO);
dup2(fd[1], STDERR_FILENO);
close(fd[1]);
/* set the child as the process group leader, otherwise orphans may be left after timeout */
if (-1 == setpgid(0, 0))
{
zabbix_log(LOG_LEVEL_ERR, "%s(): failed to create a process group: %s",
__function_name, zbx_strerror(errno));
exit(EXIT_SUCCESS);
}
zabbix_log(LOG_LEVEL_DEBUG, "%s(): executing script", __function_name);
execl("/bin/sh", "sh", "-c", command, NULL);
/* execl() returns only when an error occurs */
zabbix_log(LOG_LEVEL_WARNING, "execl() failed for [%s]: %s", command, zbx_strerror(errno));
exit(EXIT_SUCCESS);
}
/******************************************************************************
* *
* Function: zbx_popen *
* *
* Purpose: this function opens a process by creating a pipe, forking, *
* and invoking the shell *
* *
* Parameters: pid - [OUT] child process PID *
* command - [IN] a pointer to a null-terminated string *
* containing a shell command line *
* *
* Return value: on success, reading file descriptor is returned. On error, *
* -1 is returned, and errno is set appropriately *
* *
* Author: Alexander Vladishev *
* *
* Comments: *
* *
******************************************************************************/
static int zbx_popen(pid_t *pid, const char *command)
{
const char *__function_name = "zbx_popen";
int fd[2];
zabbix_log(LOG_LEVEL_DEBUG, "In %s() command:'%s'", __function_name, command);
if (-1 == pipe(fd))
return -1;
if (-1 == (*pid = zbx_fork()))
{
close(fd[0]);
close(fd[1]);
return -1;
}
if (*pid > 0) /* parent process */
{
close(fd[1]);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%d", __function_name, fd[0]);
return fd[0];
}
/* child process */
close(fd[0]);
dup2(fd[1], STDOUT_FILENO);
close(fd[1]);
zabbix_log(LOG_LEVEL_DEBUG, "%s() executing script", __function_name);
execl("/bin/sh", "sh", "-c", command, NULL);
zabbix_log(LOG_LEVEL_DEBUG, "%s() cannot execute script [%s]: %s", __function_name, command, strerror(errno));
exit(FAIL);
}
/******************************************************************************
* *
* Function: execute_action *
* *
* Purpose: execute an action depending on mediatype *
* *
* Parameters: alert - alert details *
* mediatype - media details *
* *
* Return value: SUCCESS - action executed sucessfully *
* FAIL - otherwise, error will contain error message *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
int execute_action(DB_ALERT *alert,DB_MEDIATYPE *mediatype, char *error, int max_error_len)
{
int res=FAIL;
int pid;
char full_path[MAX_STRING_LEN];
char env_alertid[128],env_actionid[128],env_clock[128],env_mediatypeid[128],
env_status[128];
char *zbxenv[] = { (char *)&env_alertid, (char *)&env_actionid, (char *)&env_clock,
(char *)&env_mediatypeid, (char *)&env_status,
(char *)0 };
zabbix_log( LOG_LEVEL_DEBUG, "In execute_action(%s)",
mediatype->smtp_server);
if(mediatype->type==MEDIA_TYPE_EMAIL)
{
alarm(40);
res = send_email(mediatype->smtp_server,mediatype->smtp_helo,mediatype->smtp_email,alert->sendto,alert->subject,
alert->message, error, max_error_len);
alarm(0);
}
#if defined (HAVE_JABBER)
else if(mediatype->type==MEDIA_TYPE_JABBER)
{
/* Jabber uses its own timeouts */
res = send_jabber(mediatype->username, mediatype->passwd, alert->sendto, alert->subject,
alert->message, error, max_error_len);
}
#endif /* HAVE_JABBER */
else if(mediatype->type==MEDIA_TYPE_SMS)
{
/* SMS uses its own timeouts */
res = send_sms(mediatype->gsm_modem,alert->sendto,alert->message, error, max_error_len);
}
else if(mediatype->type==MEDIA_TYPE_EXEC)
{
/* if(-1 == execl(CONFIG_ALERT_SCRIPTS_PATH,mediatype->exec_path,alert->sendto,alert->subject,alert->message))*/
zabbix_log( LOG_LEVEL_DEBUG, "Before execl([%s],[%s])",
CONFIG_ALERT_SCRIPTS_PATH,
mediatype->exec_path);
/* if(-1 == execl("/home/zabbix/bin/lmt.sh","lmt.sh",alert->sendto,alert->subject,alert->message,(char *)0))*/
pid = zbx_fork();
if(0 != pid)
{
waitpid(pid,NULL,0);
}
else
{
strscpy(full_path,CONFIG_ALERT_SCRIPTS_PATH);
zbx_strlcat(full_path,"/",MAX_STRING_LEN);
zbx_strlcat(full_path,mediatype->exec_path,MAX_STRING_LEN);
ltrim_spaces(full_path);
zabbix_log( LOG_LEVEL_DEBUG, "Before executing [%s]",
full_path);
zbx_snprintf(env_alertid,127,"ZABBIX_ALERT_ID=%d",
alert->alertid);
zbx_snprintf(env_actionid,127,"ZABBIX_ACTION_ID=%d",
alert->actionid);
zbx_snprintf(env_clock,127,"ZABBIX_ALERT_TIME=%d",
alert->clock);
zbx_snprintf(env_mediatypeid,127,"ZABBIX_ALERT_MEDIATYPEID=%d",
alert->mediatypeid);
zbx_snprintf(env_status,127,"ZABBIX_ALERT_STATUS=%d",
alert->status);
/* if(-1 == execl(full_path,mediatype->exec_path,alert->sendto,alert->subject,alert->message,(char *)0))*/
if(-1 == execle(full_path,mediatype->exec_path,alert->sendto,alert->subject,alert->message,(char *)0, zbxenv))
{
zabbix_log( LOG_LEVEL_ERR, "Error executing [%s] [%s]",
full_path,
strerror(errno));
zabbix_syslog("Error executing [%s] [%s]",
full_path,
strerror(errno));
zbx_snprintf(error,max_error_len,"Error executing [%s] [%s]",
full_path,
strerror(errno));
res = FAIL;
}
else
{
res = SUCCEED;
}
/* In normal case the program will never reach this point */
zabbix_log( LOG_LEVEL_DEBUG, "After execl()");
exit(0);
}
res = SUCCEED;
}
else
{
zabbix_log( LOG_LEVEL_ERR, "Unsupported media type [%d] for alert ID [%d]",
mediatype->type,
alert->alertid);
zabbix_syslog("Unsupported media type [%d] for alert ID [%d]",
mediatype->type,
alert->alertid);
zbx_snprintf(error,max_error_len,"Unsupported media type [%d]",
mediatype->type);
res=FAIL;
}
zabbix_log( LOG_LEVEL_DEBUG, "End execute_action()");
return res;
}
/******************************************************************************
* *
* Function: daemon_start *
* *
* Purpose: init process as daemon *
* *
* Parameters: allow_root - allow root permission for application *
* user - user on the system to which to drop the *
* privileges *
* *
* Author: Alexei Vladishev *
* *
* Comments: it doesn't allow running under 'root' if allow_root is zero *
* *
******************************************************************************/
int daemon_start(int allow_root, const char *user)
{
pid_t pid;
struct passwd *pwd;
if (0 == allow_root && 0 == getuid()) /* running as root? */
{
if (NULL == user)
user = "******";
pwd = getpwnam(user);
if (NULL == pwd)
{
zbx_error("user %s does not exist", user);
zbx_error("cannot run as root!");
exit(EXIT_FAILURE);
}
if (0 == pwd->pw_uid)
{
zbx_error("User=%s contradicts AllowRoot=0", user);
zbx_error("cannot run as root!");
exit(EXIT_FAILURE);
}
if (-1 == setgid(pwd->pw_gid))
{
zbx_error("cannot setgid to %s: %s", user, zbx_strerror(errno));
exit(EXIT_FAILURE);
}
#ifdef HAVE_FUNCTION_INITGROUPS
if (-1 == initgroups(user, pwd->pw_gid))
{
zbx_error("cannot initgroups to %s: %s", user, zbx_strerror(errno));
exit(EXIT_FAILURE);
}
#endif
if (-1 == setuid(pwd->pw_uid))
{
zbx_error("cannot setuid to %s: %s", user, zbx_strerror(errno));
exit(EXIT_FAILURE);
}
#ifdef HAVE_FUNCTION_SETEUID
if (-1 == setegid(pwd->pw_gid) || -1 == seteuid(pwd->pw_uid))
{
zbx_error("cannot setegid or seteuid to %s: %s", user, zbx_strerror(errno));
exit(EXIT_FAILURE);
}
#endif
}
if (0 != (pid = zbx_fork()))
exit(EXIT_SUCCESS);
setsid();
signal(SIGHUP, SIG_IGN);
if (0 != (pid = zbx_fork()))
exit(EXIT_SUCCESS);
if (-1 == chdir("/")) /* this is to eliminate warning: ignoring return value of chdir */
assert(0);
umask(0002);
redirect_std(CONFIG_LOG_FILE);
if (FAIL == create_pid_file(CONFIG_PID_FILE))
exit(EXIT_FAILURE);
atexit(daemon_stop);
parent_pid = (int)getpid();
zbx_set_common_signal_handlers();
set_daemon_signal_handlers();
/* Set SIGCHLD now to avoid race conditions when a child process is created before */
/* sigaction() is called. To avoid problems when scripts exit in zbx_execute() and */
/* other cases, SIGCHLD is set to SIG_DFL in zbx_child_fork(). */
zbx_set_child_signal_handler();
return MAIN_ZABBIX_ENTRY();
}
/******************************************************************************
* *
* Function: execute_action *
* *
* Purpose: execute an action depending on mediatype *
* *
* Parameters: alert - alert details *
* mediatype - media details *
* *
* Return value: SUCCESS - action executed sucessfully *
* FAIL - otherwise, error will contain error message *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
int execute_action(DB_ALERT *alert, DB_MEDIATYPE *mediatype, char *error, int max_error_len)
{
const char *__function_name = "execute_action";
int pid, res = FAIL;
char full_path[MAX_STRING_LEN];
zabbix_log(LOG_LEVEL_DEBUG, "In %s(): alertid [" ZBX_FS_UI64 "] mediatype [%d]",
__function_name, alert->alertid, mediatype->type);
if (MEDIA_TYPE_EMAIL == mediatype->type)
{
alarm(40);
res = send_email(mediatype->smtp_server, mediatype->smtp_helo, mediatype->smtp_email,
alert->sendto, alert->subject, alert->message, error, max_error_len);
alarm(0);
}
#if defined(HAVE_JABBER)
else if (MEDIA_TYPE_JABBER == mediatype->type)
{
/* Jabber uses its own timeouts */
res = send_jabber(mediatype->username, mediatype->passwd,
alert->sendto, alert->subject, alert->message, error, max_error_len);
}
#endif
else if (MEDIA_TYPE_SMS == mediatype->type)
{
/* SMS uses its own timeouts */
res = send_sms(mediatype->gsm_modem, alert->sendto, alert->message, error, max_error_len);
}
else if (MEDIA_TYPE_EZ_TEXTING == mediatype->type)
{
/* Ez Texting uses its own timeouts */
res = send_ez_texting(mediatype->username, mediatype->passwd,
alert->sendto, alert->message, mediatype->exec_path, error, max_error_len);
}
else if (MEDIA_TYPE_EXEC == mediatype->type)
{
pid = zbx_fork();
if (0 != pid)
{
waitpid(pid, NULL, 0);
res = SUCCEED;
}
else
{
zbx_snprintf(full_path, sizeof(full_path), "%s/%s",
CONFIG_ALERT_SCRIPTS_PATH, mediatype->exec_path);
zabbix_log(LOG_LEVEL_DEBUG, "Before executing [%s]", full_path);
if (-1 == execl(full_path, mediatype->exec_path, alert->sendto,
alert->subject, alert->message, (char *)NULL))
{
zabbix_log(LOG_LEVEL_ERR, "Error executing [%s] [%s]",
full_path,
strerror(errno));
zabbix_syslog("Error executing [%s] [%s]",
full_path,
strerror(errno));
exit(FAIL);
}
else
THIS_SHOULD_NEVER_HAPPEN;
}
}
else
{
zabbix_log(LOG_LEVEL_ERR, "Unsupported media type [%d] for alert ID [" ZBX_FS_UI64 "]",
mediatype->type,
alert->alertid);
zabbix_syslog("Unsupported media type [%d] for alert ID [" ZBX_FS_UI64 "]",
mediatype->type,
alert->alertid);
zbx_snprintf(error, max_error_len, "Unsupported media type [%d]",
mediatype->type);
res = FAIL;
}
zabbix_log(LOG_LEVEL_DEBUG, "End of %s(): %d", __function_name, zbx_result_string(res));
return res;
}
int RUN_COMMAND(const char *cmd, const char *param, unsigned flags, AGENT_RESULT *result)
{
#define MAX_FLAG_LEN 10
char command[MAX_STRING_LEN];
char flag[MAX_FLAG_LEN];
#if defined (_WINDOWS)
STARTUPINFO si;
PROCESS_INFORMATION pi;
char full_command[MAX_STRING_LEN];
#else /* not _WINDOWS */
pid_t pid;
#endif
assert(result);
init_result(result);
if (CONFIG_ENABLE_REMOTE_COMMANDS != 1)
{
SET_MSG_RESULT(result, strdup("ZBX_NOTSUPPORTED"));
return SYSINFO_RET_FAIL;
}
if (num_param(param) > 2)
return SYSINFO_RET_FAIL;
if (0 != get_param(param, 1, command, sizeof(command)))
return SYSINFO_RET_FAIL;
if (*command == '\0')
return SYSINFO_RET_FAIL;
zabbix_log(LOG_LEVEL_DEBUG, "Run command '%s'", command);
if (0 != get_param(param, 2, flag, sizeof(flag)))
*flag = '\0';
if (*flag == '\0')
zbx_snprintf(flag, sizeof(flag), "wait");
if (0 == strcmp(flag, "wait"))
return EXECUTE_STR(cmd,command,flags,result);
else if(0 != strcmp(flag,"nowait"))
return SYSINFO_RET_FAIL;
#if defined(_WINDOWS)
zbx_snprintf(full_command, sizeof(full_command), "cmd /C \"%s\"", command);
GetStartupInfo(&si);
zabbix_log(LOG_LEVEL_DEBUG, "Execute command '%s'",full_command);
if(!CreateProcess(
NULL, /* No module name (use command line) */
full_command,/* Name of app to launch */
NULL, /* Default process security attributes */
NULL, /* Default thread security attributes */
FALSE, /* Don't inherit handles from the parent */
0, /* Normal priority */
NULL, /* Use the same environment as the parent */
NULL, /* Launch in the current directory */
&si, /* Startup Information */
&pi)) /* Process information stored upon return */
{
return SYSINFO_RET_FAIL;
}
#else /* not _WINDOWS */
pid = zbx_fork(); /* run new thread 1 */
switch(pid)
{
case -1:
zabbix_log(LOG_LEVEL_WARNING, "fork failed for command '%s'",command);
return SYSINFO_RET_FAIL;
case 0:
pid = zbx_fork(); /* run new tread 2 to replace by command */
switch(pid)
{
case -1:
zabbix_log(LOG_LEVEL_WARNING, "fork2 failed for '%s'",command);
return SYSINFO_RET_FAIL;
case 0:
/*
* DON'T REMOVE SLEEP
* sleep needed to return server result as "1"
* then we can run "execl"
* otherwise command print result into socket with STDOUT id
*/
sleep(3);
/**/
/* replace thread 2 by the execution of command */
if(execl("/bin/sh", "sh", "-c", command, (char *)0))
{
zabbix_log(LOG_LEVEL_WARNING, "execl failed for command '%s'",command);
}
/* In normal case the program will never reach this point */
exit(0);
default:
waitpid(pid, NULL, WNOHANG); /* NO WAIT can be used for thread 2 closing */
exit(0); /* close thread 1 and transmit thread 2 to system (solve zombie state) */
break;
}
default:
waitpid(pid, NULL, 0); /* wait thread 1 closing */
break;
}
#endif /* _WINDOWS */
SET_UI64_RESULT(result, 1);
return SYSINFO_RET_OK;
}
/******************************************************************************
* *
* Function: zbx_execute_nowait *
* *
* Purpose: this function executes a script in the background and *
* suppresses the std output *
* *
* Parameters: command - [IN] command for execution *
* *
* Author: Rudolfs Kreicbergs *
* *
******************************************************************************/
int zbx_execute_nowait(const char *command)
{
#ifdef _WINDOWS
const char *__function_name = "zbx_execute_nowait";
char *full_command;
STARTUPINFO si;
PROCESS_INFORMATION pi;
wchar_t *wcommand;
full_command = zbx_dsprintf(NULL, "cmd /C \"%s\"", command);
wcommand = zbx_utf8_to_unicode(full_command);
/* fill in process startup info structure */
memset(&si, 0, sizeof(si));
si.cb = sizeof(si);
GetStartupInfo(&si);
zabbix_log(LOG_LEVEL_DEBUG, "%s(): executing [%s]", __function_name, full_command);
if (0 == CreateProcess(
NULL, /* no module name (use command line) */
wcommand, /* name of app to launch */
NULL, /* default process security attributes */
NULL, /* default thread security attributes */
FALSE, /* do not inherit handles from the parent */
0, /* normal priority */
NULL, /* use the same environment as the parent */
NULL, /* launch in the current directory */
&si, /* startup information */
&pi)) /* process information stored upon return */
{
zabbix_log(LOG_LEVEL_WARNING, "failed to create process for [%s]: %s",
full_command, strerror_from_system(GetLastError()));
return FAIL;
}
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
zbx_free(wcommand);
zbx_free(full_command);
return SUCCEED;
#else /* not _WINDOWS */
pid_t pid;
/* use a double fork for running the command in background */
if (-1 == (pid = zbx_fork()))
{
zabbix_log(LOG_LEVEL_WARNING, "first fork() failed for executing [%s]: %s",
command, zbx_strerror(errno));
return FAIL;
}
else if (0 != pid)
{
waitpid(pid, NULL, 0);
return SUCCEED;
}
/* This is the child process. Now create a grand child process which */
/* will be replaced by execl() with the actual command to be executed. */
pid = zbx_fork();
switch (pid)
{
case -1:
zabbix_log(LOG_LEVEL_WARNING, "second fork() failed for executing [%s]: %s",
command, zbx_strerror(errno));
break;
case 0:
/* this is the grand child process */
/* suppress the output of the executed script, otherwise */
/* the output might get written to a logfile or elsewhere */
redirect_std(NULL);
/* replace the process with actual command to be executed */
execl("/bin/sh", "sh", "-c", command, NULL);
/* execl() returns only when an error occurs */
zabbix_log(LOG_LEVEL_WARNING, "execl() failed for [%s]: %s", command, zbx_strerror(errno));
break;
default:
/* this is the child process, exit to complete the double fork */
waitpid(pid, NULL, WNOHANG);
break;
}
/* always exit, parent has already returned */
exit(EXIT_SUCCESS);
#endif
}
/******************************************************************************
* *
* Function: zbx_popen *
* *
* Purpose: this function opens a process by creating a pipe, forking, *
* and invoking the shell *
* *
* Parameters: pid - [OUT] child process PID *
* command - [IN] a pointer to a null-terminated string *
* containing a shell command line *
* *
* Return value: on success, reading file descriptor is returned. On error, *
* -1 is returned, and errno is set appropriately *
* *
* Author: Alexander Vladishev *
* *
******************************************************************************/
static int zbx_popen(pid_t *pid, const char *command)
{
int fd[2], stdout_orig, stderr_orig;
zabbix_log(LOG_LEVEL_DEBUG, "In %s() command:'%s'", __func__, command);
if (-1 == pipe(fd))
return -1;
if (-1 == (*pid = zbx_fork()))
{
close(fd[0]);
close(fd[1]);
return -1;
}
if (0 != *pid) /* parent process */
{
close(fd[1]);
zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%d", __func__, fd[0]);
return fd[0];
}
/* child process */
close(fd[0]);
/* set the child as the process group leader, otherwise orphans may be left after timeout */
if (-1 == setpgid(0, 0))
{
zabbix_log(LOG_LEVEL_ERR, "%s(): failed to create a process group: %s", __func__, zbx_strerror(errno));
exit(EXIT_FAILURE);
}
zabbix_log(LOG_LEVEL_DEBUG, "%s(): executing script", __func__);
/* preserve stdout and stderr to restore them in case execl() fails */
stdout_orig = dup(STDOUT_FILENO);
stderr_orig = dup(STDERR_FILENO);
fcntl(stdout_orig, F_SETFD, FD_CLOEXEC);
fcntl(stderr_orig, F_SETFD, FD_CLOEXEC);
/* redirect output right before script execution after all logging is done */
dup2(fd[1], STDOUT_FILENO);
dup2(fd[1], STDERR_FILENO);
close(fd[1]);
execl("/bin/sh", "sh", "-c", command, NULL);
/* restore original stdout and stderr, because we don't want our output to be confused with script's output */
dup2(stdout_orig, STDOUT_FILENO);
dup2(stderr_orig, STDERR_FILENO);
close(stdout_orig);
close(stderr_orig);
/* this message may end up in stdout or stderr, that's why we needed to save and restore them */
zabbix_log(LOG_LEVEL_WARNING, "execl() failed for [%s]: %s", command, zbx_strerror(errno));
/* execl() returns only when an error occurs, let parent process know about it */
exit(EXIT_FAILURE);
}
int MAIN_ZABBIX_ENTRY(void)
{
int i;
pid_t pid;
zbx_sock_t listen_sock;
int server_num = 0;
if(CONFIG_LOG_FILE == NULL)
{
zabbix_open_log(LOG_TYPE_SYSLOG,CONFIG_LOG_LEVEL,NULL);
}
else
{
zabbix_open_log(LOG_TYPE_FILE,CONFIG_LOG_LEVEL,CONFIG_LOG_FILE);
}
#ifdef HAVE_SNMP
# define SNMP_FEATURE_STATUS "YES"
#else
# define SNMP_FEATURE_STATUS " NO"
#endif
#ifdef HAVE_LIBCURL
# define LIBCURL_FEATURE_STATUS "YES"
#else
# define LIBCURL_FEATURE_STATUS " NO"
#endif
#ifdef HAVE_ODBC
# define ODBC_FEATURE_STATUS "YES"
#else
# define ODBC_FEATURE_STATUS " NO"
#endif
#ifdef HAVE_IPV6
# define IPV6_FEATURE_STATUS "YES"
#else
# define IPV6_FEATURE_STATUS " NO"
#endif
zabbix_log( LOG_LEVEL_WARNING, "Starting zabbix_proxy. ZABBIX %s (revision %s).",
ZABBIX_VERSION,
ZABBIX_REVISION);
zabbix_log( LOG_LEVEL_WARNING, "**** Enabled features ****");
zabbix_log( LOG_LEVEL_WARNING, "SNMP monitoring: " SNMP_FEATURE_STATUS );
zabbix_log( LOG_LEVEL_WARNING, "WEB monitoring: " LIBCURL_FEATURE_STATUS );
zabbix_log( LOG_LEVEL_WARNING, "ODBC: " ODBC_FEATURE_STATUS );
zabbix_log( LOG_LEVEL_WARNING, "IPv6 support: " IPV6_FEATURE_STATUS );
zabbix_log( LOG_LEVEL_WARNING, "**************************");
#ifdef HAVE_SQLITE3
if(ZBX_MUTEX_ERROR == php_sem_get(&sqlite_access, CONFIG_DBNAME))
{
zbx_error("Unable to create mutex for sqlite");
exit(FAIL);
}
#endif /* HAVE_SQLITE3 */
DBinit();
init_database_cache(ZBX_PROCESS_PROXY);
threads = calloc(1 + CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS
+ CONFIG_TRAPPERD_FORKS + CONFIG_PINGER_FORKS + CONFIG_HOUSEKEEPER_FORKS
+ CONFIG_UNREACHABLE_POLLER_FORKS + CONFIG_HTTPPOLLER_FORKS + CONFIG_DISCOVERER_FORKS
+ CONFIG_DBSYNCER_FORKS + CONFIG_IPMIPOLLER_FORKS, sizeof(pid_t));
if (CONFIG_TRAPPERD_FORKS > 0) {
if (FAIL == zbx_tcp_listen(&listen_sock, CONFIG_LISTEN_IP, (unsigned short)CONFIG_LISTEN_PORT)) {
zabbix_log(LOG_LEVEL_CRIT, "Listener failed with error: %s.", zbx_tcp_strerror());
exit(1);
}
}
for ( i = 1;
i <= CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS
+ CONFIG_TRAPPERD_FORKS + CONFIG_PINGER_FORKS + CONFIG_HOUSEKEEPER_FORKS
+ CONFIG_UNREACHABLE_POLLER_FORKS + CONFIG_HTTPPOLLER_FORKS + CONFIG_DISCOVERER_FORKS
+ CONFIG_DBSYNCER_FORKS + CONFIG_IPMIPOLLER_FORKS;
i++)
{
if ((pid = zbx_fork()) == 0) {
server_num = i;
break;
} else
threads[i] = pid;
}
/* Main process */
if (server_num == 0) {
init_main_process();
zabbix_log(LOG_LEVEL_WARNING, "server #%d started [Heartbeat sender]",
server_num);
main_heart_loop();
for (;;)
zbx_sleep(3600);
}
if (server_num <= CONFIG_CONFSYNCER_FORKS)
{
zabbix_log(LOG_LEVEL_WARNING, "server #%d started [Configuration syncer]",
server_num);
main_proxyconfig_loop(server_num);
}
else if (server_num <= CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS)
{
zabbix_log(LOG_LEVEL_WARNING, "server #%d started [Datasender]",
server_num);
main_datasender_loop();
}
else if (server_num <= CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS)
{
#ifdef HAVE_SNMP
init_snmp("zabbix_server");
#endif /* HAVE_SNMP */
zabbix_log(LOG_LEVEL_WARNING, "server #%d started [Poller. SNMP:"SNMP_FEATURE_STATUS"]",
server_num);
main_poller_loop(ZBX_PROCESS_PROXY, ZBX_POLLER_TYPE_NORMAL, server_num - (CONFIG_CONFSYNCER_FORKS
+ CONFIG_DATASENDER_FORKS));
}
else if (server_num <= CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS
+ CONFIG_TRAPPERD_FORKS)
{
zabbix_log(LOG_LEVEL_WARNING, "server #%d started [Trapper]",
server_num);
child_trapper_main(ZBX_PROCESS_PROXY, &listen_sock);
}
else if(server_num <= CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS
+ CONFIG_TRAPPERD_FORKS + CONFIG_PINGER_FORKS)
{
zabbix_log(LOG_LEVEL_WARNING, "server #%d started [ICMP pinger]",
server_num);
main_pinger_loop(ZBX_PROCESS_PROXY, server_num - (CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS
+ CONFIG_POLLER_FORKS + CONFIG_TRAPPERD_FORKS));
}
else if(server_num <= CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS
+ CONFIG_TRAPPERD_FORKS + CONFIG_PINGER_FORKS + CONFIG_HOUSEKEEPER_FORKS)
{
zabbix_log(LOG_LEVEL_WARNING, "server #%d started [Housekeeper]",
server_num);
main_housekeeper_loop();
}
else if(server_num <= CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS
+ CONFIG_TRAPPERD_FORKS + CONFIG_PINGER_FORKS + CONFIG_HOUSEKEEPER_FORKS
+ CONFIG_UNREACHABLE_POLLER_FORKS)
{
#ifdef HAVE_SNMP
init_snmp("zabbix_server");
#endif /* HAVE_SNMP */
zabbix_log(LOG_LEVEL_WARNING, "server #%d started [Poller for unreachable hosts. SNMP:"SNMP_FEATURE_STATUS"]",
server_num);
main_poller_loop(ZBX_PROCESS_PROXY, ZBX_POLLER_TYPE_UNREACHABLE, server_num
- (CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS
+ CONFIG_TRAPPERD_FORKS + CONFIG_PINGER_FORKS + CONFIG_HOUSEKEEPER_FORKS));
}
else if (server_num <= CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS
+ CONFIG_TRAPPERD_FORKS + CONFIG_PINGER_FORKS + CONFIG_HOUSEKEEPER_FORKS
+ CONFIG_UNREACHABLE_POLLER_FORKS + CONFIG_HTTPPOLLER_FORKS)
{
zabbix_log(LOG_LEVEL_WARNING, "server #%d started [HTTP Poller]",
server_num);
main_httppoller_loop(ZBX_PROCESS_PROXY, server_num - (CONFIG_CONFSYNCER_FORKS
+ CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS + CONFIG_TRAPPERD_FORKS
+ CONFIG_PINGER_FORKS + CONFIG_HOUSEKEEPER_FORKS
+ CONFIG_UNREACHABLE_POLLER_FORKS));
}
else if (server_num <= CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS
+ CONFIG_TRAPPERD_FORKS + CONFIG_PINGER_FORKS + CONFIG_HOUSEKEEPER_FORKS
+ CONFIG_UNREACHABLE_POLLER_FORKS + CONFIG_HTTPPOLLER_FORKS + CONFIG_DISCOVERER_FORKS)
{
#ifdef HAVE_SNMP
init_snmp("zabbix_server");
#endif /* HAVE_SNMP */
zabbix_log(LOG_LEVEL_WARNING, "server #%d started [Discoverer. SNMP:"SNMP_FEATURE_STATUS"]",
server_num);
main_discoverer_loop(ZBX_PROCESS_PROXY, server_num - (CONFIG_CONFSYNCER_FORKS
+ CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS + CONFIG_TRAPPERD_FORKS
+ CONFIG_PINGER_FORKS + CONFIG_HOUSEKEEPER_FORKS + CONFIG_UNREACHABLE_POLLER_FORKS
+ CONFIG_HTTPPOLLER_FORKS));
}
else if (server_num <= CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS
+ CONFIG_TRAPPERD_FORKS + CONFIG_PINGER_FORKS + CONFIG_HOUSEKEEPER_FORKS
+ CONFIG_UNREACHABLE_POLLER_FORKS + CONFIG_HTTPPOLLER_FORKS + CONFIG_DISCOVERER_FORKS
+ CONFIG_DBSYNCER_FORKS)
{
zabbix_log(LOG_LEVEL_WARNING, "server #%d started [DB Syncer]",
server_num);
main_dbsyncer_loop();
}
else if (server_num <= CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS
+ CONFIG_TRAPPERD_FORKS + CONFIG_PINGER_FORKS + CONFIG_HOUSEKEEPER_FORKS
+ CONFIG_UNREACHABLE_POLLER_FORKS + CONFIG_HTTPPOLLER_FORKS + CONFIG_DISCOVERER_FORKS
+ CONFIG_DBSYNCER_FORKS + CONFIG_IPMIPOLLER_FORKS)
{
zabbix_log(LOG_LEVEL_WARNING, "server #%d started [IPMI Poller]",
server_num);
main_poller_loop(ZBX_PROCESS_PROXY, ZBX_POLLER_TYPE_IPMI, server_num
- (CONFIG_CONFSYNCER_FORKS + CONFIG_DATASENDER_FORKS + CONFIG_POLLER_FORKS
+ CONFIG_TRAPPERD_FORKS + CONFIG_PINGER_FORKS + CONFIG_HOUSEKEEPER_FORKS
+ CONFIG_UNREACHABLE_POLLER_FORKS + CONFIG_HTTPPOLLER_FORKS + CONFIG_DISCOVERER_FORKS
+ CONFIG_DBSYNCER_FORKS));
}
return SUCCEED;
}
int daemon_start(int allow_root, const char* user)
{
pid_t pid;
struct passwd *pwd;
struct sigaction phan;
/* running as root ?*/
if((0 == allow_root) && (0 == getuid() || 0 == getgid()))
{
pwd = getpwnam(user);
if (NULL == pwd)
{
zbx_error("User %s does not exist.",
user);
zbx_error("Cannot run as root !");
exit(FAIL);
}
if(setgid(pwd->pw_gid) ==-1)
{
zbx_error("Cannot setgid to %s [%s].",
user,
strerror(errno));
exit(FAIL);
}
#ifdef HAVE_FUNCTION_INITGROUPS
if(initgroups(user, pwd->pw_gid) == -1)
{
zbx_error("Cannot initgroups to %s [%s].",
user,
strerror(errno));
exit(FAIL);
}
#endif /* HAVE_FUNCTION_INITGROUPS */
if(setuid(pwd->pw_uid) == -1)
{
zbx_error("Cannot setuid to %s [%s].",
user,
strerror(errno));
exit(FAIL);
}
#ifdef HAVE_FUNCTION_SETEUID
if( (setegid(pwd->pw_gid) ==-1) || (seteuid(pwd->pw_uid) == -1) )
{
zbx_error("Cannot setegid or seteuid to zabbix [%s].", strerror(errno));
exit(FAIL);
}
#endif /* HAVE_FUNCTION_SETEUID */
}
if( (pid = zbx_fork()) != 0 )
{
exit( 0 );
}
setsid();
signal( SIGHUP, SIG_IGN );
if( (pid = zbx_fork()) !=0 )
{
exit( 0 );
}
/* This is to eliminate warning: ignoring return value of chdir */
if(-1 == chdir("/"))
{
assert(0);
}
umask(0002);
redirect_std(CONFIG_LOG_FILE);
#ifdef HAVE_SYS_RESOURCE_SETPRIORITY
if(setpriority(PRIO_PROCESS,0,5)!=0)
{
zbx_error("Unable to set process priority to 5. Leaving default.");
}
#endif /* HAVE_SYS_RESOURCE_SETPRIORITY */
/*------------------------------------------------*/
if( FAIL == create_pid_file(APP_PID_FILE))
{
exit(FAIL);
}
phan.sa_handler = child_signal_handler;
sigemptyset(&phan.sa_mask);
phan.sa_flags = 0;
sigaction(SIGINT, &phan, NULL);
sigaction(SIGQUIT, &phan, NULL);
sigaction(SIGTERM, &phan, NULL);
sigaction(SIGPIPE, &phan, NULL);
zbx_setproctitle("main process");
return MAIN_ZABBIX_ENTRY();
}
/******************************************************************************
* *
* Function: daemon_start *
* *
* Purpose: init process as daemon *
* *
* Parameters: allow_root - allow root permission for application *
* *
* Author: Alexei Vladishev *
* *
* Comments: it doesn't allow running under 'root' if allow_root is zero *
* *
******************************************************************************/
int daemon_start(int allow_root)
{
pid_t pid;
struct passwd *pwd;
struct sigaction phan;
char user[7] = "zabbix";
/* running as root ? */
if (0 == allow_root && (0 == getuid() || 0 == getgid()))
{
pwd = getpwnam(user);
if (NULL == pwd)
{
zbx_error("user %s does not exist", user);
zbx_error("Cannot run as root!");
exit(FAIL);
}
if (-1 == setgid(pwd->pw_gid))
{
zbx_error("cannot setgid to %s: %s", user, zbx_strerror(errno));
exit(FAIL);
}
#ifdef HAVE_FUNCTION_INITGROUPS
if (-1 == initgroups(user, pwd->pw_gid))
{
zbx_error("cannot initgroups to %s: %s", user, zbx_strerror(errno));
exit(FAIL);
}
#endif
if (-1 == setuid(pwd->pw_uid))
{
zbx_error("cannot setuid to %s: %s", user, zbx_strerror(errno));
exit(FAIL);
}
#ifdef HAVE_FUNCTION_SETEUID
if (-1 == setegid(pwd->pw_gid) || -1 == seteuid(pwd->pw_uid))
{
zbx_error("cannot setegid or seteuid to %s: %s", user, zbx_strerror(errno));
exit(FAIL);
}
#endif
}
if (0 != (pid = zbx_fork()))
exit(0);
setsid();
signal(SIGHUP, SIG_IGN);
if (0 != (pid = zbx_fork()))
exit(0);
/* this is to eliminate warning: ignoring return value of chdir */
if (-1 == chdir("/"))
assert(0);
umask(0002);
redirect_std(CONFIG_LOG_FILE);
#ifdef HAVE_SYS_RESOURCE_SETPRIORITY
if (0 != setpriority(PRIO_PROCESS, 0, 5))
zbx_error("Unable to set process priority to 5. Leaving default.");
#endif
/*------------------------------------------------*/
if (FAIL == create_pid_file(CONFIG_PID_FILE))
exit(FAIL);
parent_pid = (int)getpid();
phan.sa_sigaction = child_signal_handler;
sigemptyset(&phan.sa_mask);
phan.sa_flags = SA_SIGINFO;
sigaction(SIGINT, &phan, NULL);
sigaction(SIGQUIT, &phan, NULL);
sigaction(SIGTERM, &phan, NULL);
sigaction(SIGPIPE, &phan, NULL);
sigaction(SIGILL, &phan, NULL);
sigaction(SIGFPE, &phan, NULL);
sigaction(SIGSEGV, &phan, NULL);
sigaction(SIGBUS, &phan, NULL);
sigaction(SIGALRM, &phan, NULL);
sigaction(SIGUSR1, &phan, NULL);
/* Set SIGCHLD now to avoid race conditions when a child process is created before */
/* sigaction() is called. To avoid problems when scripts exit in zbx_execute() and */
/* other cases, SIGCHLD is set to SIG_IGN in zbx_child_fork(). */
phan.sa_sigaction = parent_signal_handler;
sigaction(SIGCHLD, &phan, NULL);
zbx_setproctitle("main process");
return MAIN_ZABBIX_ENTRY();
}