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/* --- BEGIN COPYRIGHT BLOCK ---
* Copyright (C) 2021 Red Hat, Inc.
* All rights reserved.
*
* License: GPL (version 3 or any later version).
* See LICENSE for details.
* --- END COPYRIGHT BLOCK --- */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <inttypes.h>
#include <signal.h>
#include <sys/stat.h>
#include "ldap-agent.h"
#include "ldap.h"
#include "ldif.h"
#include <ctype.h>
#include <limits.h>
#include <errno.h>
static char *agentx_master = NULL;
static char *agent_logdir = NULL;
static char *pidfile = NULL;
server_instance *server_head = NULL;
static int keep_running;
RETSIGTYPE
stop_server(int signum)
{
if (signum == SIGUSR1) {
snmp_log(LOG_WARNING, "Detected attempt to start ldap-agent again.\n");
} else {
snmp_log(LOG_WARNING, "Received stop signal. Stopping ldap-agent...\n");
keep_running = 0;
}
}
int
main(int argc, char *argv[])
{
char *config_file = NULL;
netsnmp_log_handler *log_hdl = NULL;
int c, log_level = LOG_WARNING;
struct stat logdir_s;
pid_t child_pid = 0;
FILE *pid_fp;
/* Pause for the debugger if DEBUG_SLEEP is set in the environment */
{
char *s = getenv("DEBUG_SLEEP");
if ((s != NULL) && isdigit(*s)) {
char *endp = NULL;
int64_t secs;
errno = 0;
secs = strtol(s, &endp, 10);
if ( endp == s ||
*endp != '\0' ||
((secs == LONG_MIN || secs == LONG_MAX) && errno == ERANGE) ||
secs < 1 )
{
/* Invalid value, default to 30 seconds */
secs = 30;
} else if (secs > 3600) {
secs = 3600;
}
printf("%s pid is %d - sleeping for %" PRId64 "\n", argv[0], getpid(), secs);
sleep(secs);
}
}
/* Load options */
while ((--argc > 0) && ((*++argv)[0] == '-')) {
while ((c = *++argv[0])) {
switch (c) {
case 'D':
log_level = LOG_DEBUG;
break;
default:
printf("ldap-agent: illegal option %c\n", c);
exit_usage();
}
}
}
if (argc != 1) {
exit_usage();
}
/* load config file */
if ((config_file = strdup(*argv)) == NULL) {
printf("ldap-agent: Memory error loading config file\n");
exit(1);
}
load_config(config_file);
free(config_file);
/* check if we're already running as another process */
if ((pid_fp = fopen(pidfile, "r")) != NULL) {
int rc = fscanf(pid_fp, "%d", &child_pid);
if ((rc == 0) || (rc == EOF)) {
printf("ldap-agent: Failed to get pid from %s\n", pidfile);
exit(1);
}
fclose(pid_fp);
if (kill(child_pid, SIGUSR1) == 0) {
printf("ldap-agent: Already running as pid %d %s!\n", child_pid, pidfile);
exit(1);
} else {
/* old pidfile exists, but the process doesn't. Cleanup pidfile */
remove(pidfile);
}
}
/* start logging */
netsnmp_ds_set_boolean(NETSNMP_DS_LIBRARY_ID,
NETSNMP_DS_LIB_LOG_TIMESTAMP, 1);
if ((log_hdl = netsnmp_register_loghandler(NETSNMP_LOGHANDLER_FILE,
log_level)) != NULL) {
if (agent_logdir != NULL) {
/* Verify agent-logdir setting */
if (stat(agent_logdir, &logdir_s) < 0) {
printf("ldap-agent: Error reading logdir: %s\n", agent_logdir);
exit(1);
} else {
/* Is it a directory? */
if (S_ISDIR(logdir_s.st_mode)) {
/* Can we write to it? */
if (access(agent_logdir, W_OK) < 0) {
printf("ldap-agent: Unable to write to logdir: %s\n",
agent_logdir);
exit(1);
}
} else {
printf("ldap-agent: agent-logdir setting must point to a directory.\n");
exit(1);
}
}
/* agent-logdir setting looks ok */
if ((log_hdl->token = malloc(strlen(agent_logdir) +
strlen(LDAP_AGENT_LOGFILE) + 2)) != NULL) {
memcpy((char *)log_hdl->token, agent_logdir, strlen(agent_logdir) + 1);
/* add a trailing slash if needed */
if (*(agent_logdir + strlen(agent_logdir)) != '/')
strcat((char *)log_hdl->token, "/");
strcat((char *)log_hdl->token, LDAP_AGENT_LOGFILE);
((char *)log_hdl->token)[(strlen(agent_logdir) + strlen(LDAP_AGENT_LOGFILE) + 1)] = (char)0;
}
} else {
/* agent-logdir not set */
printf("ldap-agent: Error determining log directory.\n");
exit(1);
}
snmp_enable_filelog((char *)log_hdl->token, 1);
} else {
printf("Error starting logging.");
exit(1);
}
snmp_log(LOG_WARNING, "Starting ldap-agent...\n");
/* setup agentx master */
netsnmp_ds_set_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_ROLE, 1);
if (agentx_master)
netsnmp_ds_set_string(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_AGENT_X_SOCKET, agentx_master);
/* run as a daemon */
if (netsnmp_daemonize(0, 0)) {
int i;
int rc;
/* sleep to allow pidfile to be created by child */
for (i = 0; i < 3; i++) {
sleep(5);
if ((pid_fp = fopen(pidfile, "r")) != NULL) {
break;
}
}
if (!pid_fp) {
printf("ldap-agent: Not started after 15 seconds! Check log file for details.\n");
exit(1);
}
rc = fscanf(pid_fp, "%d", &child_pid);
if ((rc == 0) || (rc == EOF)) {
printf("ldap-agent: Failed to get pid from %s\n", pidfile);
exit(1);
}
fclose(pid_fp);
printf("ldap-agent: Started as pid %d\n", child_pid);
exit(0);
}
/* initialize the agent */
init_agent("ldap-agent");
init_ldap_agent();
init_snmp("ldap-agent");
/* listen for signals */
keep_running = 1;
signal(SIGUSR1, stop_server);
signal(SIGTERM, stop_server);
signal(SIGINT, stop_server);
/* create pidfile */
child_pid = getpid();
if ((pid_fp = fopen(pidfile, "w")) == NULL) {
snmp_log(LOG_ERR, "Error creating pid file: %s\n", pidfile);
exit(1);
} else {
if (fprintf(pid_fp, "%d", child_pid) < 0) {
snmp_log(LOG_ERR, "Error writing pid file: %s\n", pidfile);
exit(1);
}
fclose(pid_fp);
}
/* we're up and running! */
snmp_log(LOG_WARNING, "Started ldap-agent as pid %d\n", child_pid);
/* loop here until asked to stop */
while (keep_running) {
agent_check_and_process(1);
}
/* say goodbye */
snmp_shutdown("ldap-agent");
snmp_log(LOG_WARNING, "ldap-agent stopped.\n");
/* remove pidfile */
remove(pidfile);
return 0;
}
/* ldif_read_record lineno argument type depends on openldap version */
#if LDAP_VENDOR_VERSION >= 20434 /* changed in 2.4.34 */
typedef unsigned long int ldif_record_lineno_t;
#else
typedef int ldif_record_lineno_t;
#endif
/************************************************************************
* load_config
*
* Loads subagent config file and reads directory server config files.
*/
void
load_config(char *conf_path)
{
server_instance *serv_p = NULL;
FILE *conf_file = NULL;
LDIFFP *dse_fp = NULL;
int buflen = 0;
ldif_record_lineno_t lineno = 0;
char line[MAXLINE];
char *p = NULL;
int error = 0;
/* Make sure we are getting an absolute path */
if (*conf_path != '/') {
printf("ldap-agent: Error opening config file: %s\n", conf_path);
printf("ldap-agent: You must specify the absolute path to your config file\n");
error = 1;
goto close_and_exit;
}
/* Open config file */
if ((conf_file = fopen(conf_path, "r")) == NULL) {
printf("ldap-agent: Error opening config file: %s\n", conf_path);
error = 1;
goto close_and_exit;
}
/* set pidfile path */
if ((pidfile = malloc(strlen(LOCALRUNDIR) + strlen("/dirsrv/") +
strlen(LDAP_AGENT_PIDFILE) + 1)) != NULL) {
strncpy(pidfile, LOCALRUNDIR, strlen(LOCALRUNDIR) + 1);
/* The above will likely not be NULL terminated, but we need to
* be sure that we're properly NULL terminated for the below
* strcat() to work properly. */
pidfile[strlen(LOCALRUNDIR)] = (char)0;
strcat(pidfile, "/dirsrv/");
strcat(pidfile, LDAP_AGENT_PIDFILE);
} else {
printf("ldap-agent: malloc error processing config file\n");
error = 1;
goto close_and_exit;
}
/* set default logdir to location of config file */
for (p = (conf_path + strlen(conf_path) - 1); p >= conf_path; p--) {
if (*p == '/') {
if ((agent_logdir = malloc((p - conf_path) + 1)) != NULL) {
strncpy(agent_logdir, conf_path, (p - conf_path));
agent_logdir[(p - conf_path)] = (char)0;
break;
} else {
printf("ldap-agent: malloc error processing config file\n");
error = 1;
goto close_and_exit;
}
}
}
while (fgets(line, MAXLINE, conf_file) != NULL) {
/* Ignore comment lines in config file */
if (line[0] == '#')
continue;
if ((p = strstr(line, "agentx-master")) != NULL) {
/* load agentx-master setting */
p = p + 13;
if ((p = strtok(p, " \t\n")) != NULL) {
if (agentx_master) {
free(agentx_master);
}
if ((agentx_master = (char *)malloc(strlen(p) + 1)) != NULL)
strcpy(agentx_master, p);
}
} else if ((p = strstr(line, "agent-logdir")) != NULL) {
/* free the default logdir setting */
if (agent_logdir != NULL) {
free(agent_logdir);
}
/* load agent-logdir setting */
p = p + 12;
if ((p = strtok(p, " \t\n")) != NULL) {
if ((agent_logdir = (char *)malloc(strlen(p) + 1)) != NULL)
strcpy(agent_logdir, p);
}
} else if ((p = strstr(line, "server")) != NULL) {
int got_port = 0;
int got_rundir = 0;
int got_snmp_index = 0;
long snmp_index = 0;
char *entry = NULL;
char *instancename = NULL;
lineno = 0;
/* Allocate a server_instance */
if ((serv_p = malloc(sizeof(server_instance))) == NULL) {
printf("ldap-agent: malloc error processing config file\n");
error = 1;
goto close_and_exit;
}
/* load server setting */
p = p + 6;
if ((p = strtok(p, " \t\n")) != NULL) {
/* first token is the instance name */
instancename = strdup(p);
serv_p->dse_ldif = malloc(strlen(p) + strlen(SYSCONFDIR) +
strlen(PACKAGE_NAME) + 12);
if (serv_p->dse_ldif != NULL) {
snprintf(serv_p->dse_ldif, strlen(p) + strlen(SYSCONFDIR) +
strlen(PACKAGE_NAME) + 12,
"%s/%s/%s/dse.ldif",
SYSCONFDIR, PACKAGE_NAME, p);
serv_p->dse_ldif[(strlen(p) + strlen(SYSCONFDIR) +
strlen(PACKAGE_NAME) + 11)] = (char)0;
} else {
printf("ldap-agent: malloc error processing config file\n");
error = 1;
free(instancename);
instancename = NULL;
goto close_and_exit;
}
/* set the semaphore name */
/* "/" + ".stats" + \0 = 8 */
serv_p->stats_sem_name = malloc(strlen(p) + 8);
if (serv_p->stats_sem_name != NULL) {
snprintf(serv_p->stats_sem_name, strlen(p) + 8, "/%s.stats", p);
} else {
printf("ldap-agent: malloc error processing config file\n");
error = 1;
free(instancename);
instancename = NULL;
goto close_and_exit;
}
} else {
printf("ldap-agent: missing instance name\n");
error = 1;
goto close_and_exit;
}
/* Open dse.ldif */
dse_fp = ldif_open(serv_p->dse_ldif, "r");
buflen = 0;
if (dse_fp == NULL) {
printf("ldap-agent: Error opening server config file: %s\n",
serv_p->dse_ldif);
error = 1;
free(instancename);
instancename = NULL;
goto close_and_exit;
}
/* ldif_get_entry will realloc the entry if it's not null,
* so we can just free it when we're done fetching entries
* from the dse.ldif. Unfortunately, ldif_getline moves
* the pointer that is passed to it, so we need to save a
* pointer to the beginning of the entry so we can free it
* later. */
while (ldif_read_record(dse_fp, &lineno, &entry, &buflen))
{
char *entryp = entry;
char *attr = NULL;
char *val = NULL;
ber_len_t vlen;
/* Check if this is the cn=config entry */
if (ldif_parse_line(ldif_getline(&entryp), &attr, &val, &vlen)) {
printf("ldap-agent: error parsing ldif line from [%s]\n", serv_p->dse_ldif);
}
if ((strcmp(attr, "dn") == 0) && (strcmp(val, "cn=config") == 0)) {
char *dse_line = NULL;
/* Free both outer values and attr */
free(attr);
free(val);
attr = NULL;
val = NULL;
/* Look for port and rundir attributes */
while ((dse_line = ldif_getline(&entryp)) != NULL) {
if (ldif_parse_line(dse_line, &attr, &val, &vlen) != 0) {
/* can't parse these, try next line instead */
continue;
} else if (strcmp(attr, "nsslapd-snmp-index") == 0) {
snmp_index = atol(val);
got_snmp_index = 1;
} else if (strcmp(attr, "nsslapd-port") == 0) {
serv_p->port = atol(val);
got_port = 1;
} else if (strcmp(attr, "nsslapd-rundir") == 0) {
/* 8 = "/" + ".stats" + \0 */
serv_p->stats_file = malloc(vlen + (instancename ? strlen(instancename) : 0) + 8);
if (serv_p->stats_file && instancename) {
snprintf(serv_p->stats_file, vlen + strlen(instancename) + 8,
"%s/%s.stats", val, instancename);
serv_p->stats_file[(vlen + strlen(instancename) + 7)] = (char)0;
} else {
printf("ldap-agent: malloc error processing config file\n");
free(entry);
error = 1;
free(instancename);
instancename = NULL;
goto close_and_exit;
}
got_rundir = 1;
}
free(attr);
free(val);
attr = NULL;
val = NULL;
/* Stop processing this entry if we found the
* port and rundir and snmp_index settings */
if (got_port && got_rundir && got_snmp_index) {
break;
}
}
/* The port and rundir settings must be in the
* cn=config entry, so we can stop reading through
* the dse.ldif now. */
break;
} else {
free(attr);
free(val);
attr = NULL;
val = NULL;
}
}
free(instancename);
instancename = NULL;
/* We're done reading entries from dse_ldif now, so
* we can free entry */
free(entry);
/* Make sure we were able to read the port and
* location of the stats file. */
if (!got_port) {
printf("ldap-agent: Error reading nsslapd-port from "
"server config file: %s\n",
serv_p->dse_ldif);
error = 1;
goto close_and_exit;
} else if (!got_rundir) {
printf("ldap-agent: Error reading nsslapd-rundir from "
"server config file: %s\n",
serv_p->dse_ldif);
error = 1;
goto close_and_exit;
}
/* in case a snmp index is specified, it replace the nsslapd-port
* This would allow to give an index to a snmp report, rather than using
* the TCP interface port number (because the same port may be listen on multiple interfaces).
* For snmp_index values <= 0 (disabled), let's keep the port
*/
if (got_snmp_index && (snmp_index > 0)) {
serv_p->port = snmp_index;
}
/* Insert server instance into linked list */
serv_p->next = server_head;
server_head = serv_p;
}
}
/* check for at least one directory server instance */
if (server_head == NULL) {
printf("ldap-agent: No server instances defined in config file\n");
error = 1;
goto close_and_exit;
}
close_and_exit:
if (conf_file)
fclose(conf_file);
if (dse_fp) {
ldif_close(dse_fp);
}
if (error)
exit(error);
}
/************************************************************************
* exit_usage
*
* Prints usage message and exits program.
*/
void
exit_usage(void)
{
printf("Usage: ldap-agent [-D] configfile\n");
printf(" -D Enable debug logging\n");
exit(1);
}
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