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    /*
    
     * Asterisk -- An open source telephony toolkit.
    
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     *
    
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     * Matthew D. Hardeman <mhardemn@papersoft.com> 
     * Adapted from the MySQL CDR logger originally by James Sharp 
     *
     * Modified September 2003
     * Matthew D. Hardeman <mhardemn@papersoft.com>
     *
    
     * See http://www.asterisk.org for more information about
     * the Asterisk project. Please do not directly contact
     * any of the maintainers of this project for assistance;
     * the project provides a web site, mailing lists and IRC
     * channels for your use.
     *
    
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     * This program is free software, distributed under the terms of
    
     * the GNU General Public License Version 2. See the LICENSE file
     * at the top of the source tree.
     */
    
    
     * \brief PostgreSQL CDR logger 
     * 
     * \author Matthew D. Hardeman <mhardemn@papersoft.com> 
    
     * \extref PostgreSQL http://www.postgresql.org/
    
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     *
    
     * See also
     * \arg \ref Config_cdr
     * \arg http://www.postgresql.org/
    
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     * \ingroup cdr_drivers
    
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     */
    
    
    #include "asterisk.h"
    
    ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
    
    
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    #include <time.h>
    
    #include <libpq-fe.h>
    
    
    #include "asterisk/config.h"
    #include "asterisk/channel.h"
    #include "asterisk/cdr.h"
    #include "asterisk/module.h"
    
    
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    #define DATE_FORMAT "%Y-%m-%d %T"
    
    static char *name = "pgsql";
    static char *config = "cdr_pgsql.conf";
    
    static char *pghostname = NULL, *pgdbname = NULL, *pgdbuser = NULL, *pgpassword = NULL, *pgdbport = NULL, *table = NULL;
    
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    static int connected = 0;
    
    
    AST_MUTEX_DEFINE_STATIC(pgsql_lock);
    
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    static PGconn	*conn = NULL;
    
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    static int pgsql_log(struct ast_cdr *cdr)
    {
    
    	char sqlcmd[2048] = "", timestr[128];
    
    	PGresult *result;
    
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    	ast_mutex_lock(&pgsql_lock);
    
    
    	ast_localtime(&cdr->start, &tm, NULL);
    	ast_strftime(timestr, sizeof(timestr), DATE_FORMAT, &tm);
    
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    	if ((!connected) && pghostname && pgdbuser && pgpassword && pgdbname) {
    		conn = PQsetdbLogin(pghostname, pgdbport, NULL, NULL, pgdbname, pgdbuser, pgpassword);
    		if (PQstatus(conn) != CONNECTION_BAD) {
    			connected = 1;
    		} else {
    
    			pgerror = PQerrorMessage(conn);
    			ast_log(LOG_ERROR, "cdr_pgsql: Unable to connect to database server %s.  Calls will not be logged!\n", pghostname);
    
    			ast_log(LOG_ERROR, "cdr_pgsql: Reason: %s\n", pgerror);
    
    			PQfinish(conn);
    
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    		}
    	}
    
    	if (connected) {
    		char *clid=NULL, *dcontext=NULL, *channel=NULL, *dstchannel=NULL, *lastapp=NULL, *lastdata=NULL;
    
    		char *src=NULL, *dst=NULL, *uniqueid=NULL, *userfield=NULL;
    		int pgerr;
    
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    		/* Maximum space needed would be if all characters needed to be escaped, plus a trailing NULL */
    		if ((clid = alloca(strlen(cdr->clid) * 2 + 1)) != NULL)
    
    			PQescapeStringConn(conn, clid, cdr->clid, strlen(cdr->clid), &pgerr);
    
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    		if ((dcontext = alloca(strlen(cdr->dcontext) * 2 + 1)) != NULL)
    
    			PQescapeStringConn(conn, dcontext, cdr->dcontext, strlen(cdr->dcontext), &pgerr);
    
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    		if ((channel = alloca(strlen(cdr->channel) * 2 + 1)) != NULL)
    
    			PQescapeStringConn(conn, channel, cdr->channel, strlen(cdr->channel), &pgerr);
    
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    		if ((dstchannel = alloca(strlen(cdr->dstchannel) * 2 + 1)) != NULL)
    
    			PQescapeStringConn(conn, dstchannel, cdr->dstchannel, strlen(cdr->dstchannel), &pgerr);
    
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    		if ((lastapp = alloca(strlen(cdr->lastapp) * 2 + 1)) != NULL)
    
    			PQescapeStringConn(conn, lastapp, cdr->lastapp, strlen(cdr->lastapp), &pgerr);
    
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    		if ((lastdata = alloca(strlen(cdr->lastdata) * 2 + 1)) != NULL)
    
    			PQescapeStringConn(conn, lastdata, cdr->lastdata, strlen(cdr->lastdata), &pgerr);
    
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    		if ((uniqueid = alloca(strlen(cdr->uniqueid) * 2 + 1)) != NULL)
    
    			PQescapeStringConn(conn, uniqueid, cdr->uniqueid, strlen(cdr->uniqueid), &pgerr);
    
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    		if ((userfield = alloca(strlen(cdr->userfield) * 2 + 1)) != NULL)
    
    			PQescapeStringConn(conn, userfield, cdr->userfield, strlen(cdr->userfield), &pgerr);
    		if ((src = alloca(strlen(cdr->src) * 2 + 1)) != NULL)
    			PQescapeStringConn(conn, src, cdr->src, strlen(cdr->src), &pgerr);
    		if ((dst = alloca(strlen(cdr->dst) * 2 + 1)) != NULL)
    			PQescapeStringConn(conn, dst, cdr->dst, strlen(cdr->dst), &pgerr);
    
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    		/* Check for all alloca failures above at once */
    
    		if ((!clid) || (!dcontext) || (!channel) || (!dstchannel) || (!lastapp) || (!lastdata) || (!uniqueid) || (!userfield) || (!src) || (!dst)) {
    
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    			ast_log(LOG_ERROR, "cdr_pgsql:  Out of memory error (insert fails)\n");
    			ast_mutex_unlock(&pgsql_lock);
    			return -1;
    		}
    
    
    		ast_debug(2, "cdr_pgsql: inserting a CDR record.\n");
    
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    		snprintf(sqlcmd,sizeof(sqlcmd),"INSERT INTO %s (calldate,clid,src,dst,dcontext,channel,dstchannel,"
    				 "lastapp,lastdata,duration,billsec,disposition,amaflags,accountcode,uniqueid,userfield) VALUES"
    
    				 " ('%s','%s','%s','%s','%s', '%s','%s','%s','%s',%ld,%ld,'%s',%ld,'%s','%s','%s')",
    
    				 table, timestr, clid, src, dst, dcontext, channel, dstchannel, lastapp, lastdata,
    
    				 cdr->duration,cdr->billsec,ast_cdr_disp2str(cdr->disposition),cdr->amaflags, cdr->accountcode, uniqueid, userfield);
    		
    
    		ast_debug(3, "cdr_pgsql: SQL command executed:  %s\n",sqlcmd);
    
    		/* Test to be sure we're still connected... */
    		/* If we're connected, and connection is working, good. */
    		/* Otherwise, attempt reconnect.  If it fails... sorry... */
    		if (PQstatus(conn) == CONNECTION_OK) {
    			connected = 1;
    		} else {
    			ast_log(LOG_ERROR, "cdr_pgsql: Connection was lost... attempting to reconnect.\n");
    			PQreset(conn);
    			if (PQstatus(conn) == CONNECTION_OK) {
    				ast_log(LOG_ERROR, "cdr_pgsql: Connection reestablished.\n");
    				connected = 1;
    			} else {
    				pgerror = PQerrorMessage(conn);
    				ast_log(LOG_ERROR, "cdr_pgsql: Unable to reconnect to database server %s. Calls will not be logged!\n", pghostname);
    				ast_log(LOG_ERROR, "cdr_pgsql: Reason: %s\n", pgerror);
    
    				PQfinish(conn);
    
    				ast_mutex_unlock(&pgsql_lock);
    
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    		result = PQexec(conn, sqlcmd);
    
    		if (PQresultStatus(result) != PGRES_COMMAND_OK) {
    			pgerror = PQresultErrorMessage(result);
    
    			ast_log(LOG_ERROR,"cdr_pgsql: Failed to insert call detail record into database!\n");
    
    			ast_log(LOG_ERROR,"cdr_pgsql: Reason: %s\n", pgerror);
    
    			ast_log(LOG_ERROR,"cdr_pgsql: Connection may have been lost... attempting to reconnect.\n");
    			PQreset(conn);
    			if (PQstatus(conn) == CONNECTION_OK) {
    				ast_log(LOG_ERROR, "cdr_pgsql: Connection reestablished.\n");
    				connected = 1;
    
    				PQclear(result);
    
    				result = PQexec(conn, sqlcmd);
    
    				if (PQresultStatus(result) != PGRES_COMMAND_OK) {
    
    					pgerror = PQresultErrorMessage(result);
    					ast_log(LOG_ERROR,"cdr_pgsql: HARD ERROR!  Attempted reconnection failed.  DROPPING CALL RECORD!\n");
    					ast_log(LOG_ERROR,"cdr_pgsql: Reason: %s\n", pgerror);
    				}
    			}
    
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    			ast_mutex_unlock(&pgsql_lock);
    
    			PQclear(result);
    
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    			return -1;
    		}
    
    		PQclear(result);
    
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    	}
    	ast_mutex_unlock(&pgsql_lock);
    	return 0;
    }
    
    
    static int unload_module(void)
    
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    { 
    
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    	ast_cdr_unregister(name);
    	return 0;
    }
    
    
    static int config_module(int reload)
    
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    {
    	struct ast_variable *var;
    
    	const char *tmp;
    
    	struct ast_config *cfg;
    	struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
    
    	if ((cfg = ast_config_load(config, config_flags)) == NULL) {
    		ast_log(LOG_WARNING, "Unable to load config for PostgreSQL CDR's: %s\n", config);
    		return -1;
    	} else if (cfg == CONFIG_STATUS_FILEUNCHANGED)
    		return 0;
    
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    	if (!(var = ast_variable_browse(cfg, "global"))) {
    		ast_config_destroy(cfg);
    
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    		return 0;
    
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    	if (!(tmp = ast_variable_retrieve(cfg, "global", "hostname"))) {
    		ast_log(LOG_WARNING, "PostgreSQL server hostname not specified.  Assuming unix socket connection\n");
    
    		tmp = "";	/* connect via UNIX-socket by default */
    
    
    	if (pghostname)
    		ast_free(pghostname);
    
    	if (!(pghostname = ast_strdup(tmp))) {
    		ast_config_destroy(cfg);
    
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    	if (!(tmp = ast_variable_retrieve(cfg, "global", "dbname"))) {
    
    		ast_log(LOG_WARNING,"PostgreSQL database not specified.  Assuming asterisk\n");
    
    		tmp = "asteriskcdrdb";
    	}
    
    	if (pgdbname)
    		ast_free(pgdbname);
    
    	if (!(pgdbname = ast_strdup(tmp))) {
    		ast_config_destroy(cfg);
    
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    	if (!(tmp = ast_variable_retrieve(cfg, "global", "user"))) {
    
    		ast_log(LOG_WARNING,"PostgreSQL database user not specified.  Assuming asterisk\n");
    		tmp = "asterisk";
    
    	if (pgdbuser)
    		ast_free(pgdbuser);
    
    	if (!(pgdbuser = ast_strdup(tmp))) {
    		ast_config_destroy(cfg);
    
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    	if (!(tmp = ast_variable_retrieve(cfg, "global", "password"))) {
    
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    		ast_log(LOG_WARNING,"PostgreSQL database password not specified.  Assuming blank\n");
    
    	if (pgpassword)
    		ast_free(pgpassword);
    
    	if (!(pgpassword = ast_strdup(tmp))) {
    		ast_config_destroy(cfg);
    
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    	if (!(tmp = ast_variable_retrieve(cfg,"global","port"))) {
    
    		ast_log(LOG_WARNING,"PostgreSQL database port not specified.  Using default 5432.\n");
    
    	if (pgdbport)
    		ast_free(pgdbport);
    
    	if (!(pgdbport = ast_strdup(tmp))) {
    		ast_config_destroy(cfg);
    
    	if (!(tmp = ast_variable_retrieve(cfg, "global", "table"))) {
    
    		ast_log(LOG_WARNING,"CDR table not specified.  Assuming cdr\n");
    
    	if (!(table = ast_strdup(tmp))) {
    		ast_config_destroy(cfg);
    
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    			ast_debug(1, "cdr_pgsql: using default unix socket\n");
    
    			ast_debug(1, "cdr_pgsql: got hostname of %s\n", pghostname);
    			ast_debug(1, "cdr_pgsql: got port of %s\n", pgdbport);
    			ast_debug(1, "cdr_pgsql: got user of %s\n", pgdbuser);
    			ast_debug(1, "cdr_pgsql: got dbname of %s\n", pgdbname);
    			ast_debug(1, "cdr_pgsql: got password of %s\n", pgpassword);
    			ast_debug(1, "cdr_pgsql: got sql table name of %s\n", table);
    
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    	conn = PQsetdbLogin(pghostname, pgdbport, NULL, NULL, pgdbname, pgdbuser, pgpassword);
    	if (PQstatus(conn) != CONNECTION_BAD) {
    
    		ast_debug(1, "Successfully connected to PostgreSQL database.\n");
    
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    		connected = 1;
    	} else {
    
    		pgerror = PQerrorMessage(conn);
    
    		ast_log(LOG_ERROR, "cdr_pgsql: Unable to connect to database server %s.  CALLS WILL NOT BE LOGGED!!\n", pghostname);
    
    		ast_log(LOG_ERROR, "cdr_pgsql: Reason: %s\n", pgerror);
    
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    		connected = 0;
    	}
    
    
    	return ast_cdr_register(name, ast_module_info->description, pgsql_log);
    
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    }
    
    
    static int load_module(void)
    
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    {
    
    	return config_module(0) ? AST_MODULE_LOAD_DECLINE : 0;
    
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    }
    
    
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    {
    
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    }
    
    
    AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "PostgreSQL CDR Backend",
    		.load = load_module,
    		.unload = unload_module,
    		.reload = reload,
    	       );