db_id.c

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/* 
 * $Id$
 *
 * Copyright (C) 2001-2005 iptel.org
 * Copyright (C) 2007-2008 1&1 Internet AG
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio 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
 *
 * Kamailio 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 "db.h"
#include "db_id.h"
#include "../../dprint.h"
#include "../../mem/mem.h"
#include "../../pt.h"
#include "../../ut.h"
#include <stdlib.h>
#include <string.h>


static int dupl_string(char** dst, const char* begin, const char* end)
{
        if (*dst) pkg_free(*dst);

        *dst = pkg_malloc(end - begin + 1);
        if ((*dst) == NULL) {
                return -1;
        }

        memcpy(*dst, begin, end - begin);
        (*dst)[end - begin] = '\0';
        return 0;
}


static int parse_db_url(struct db_id* id, const str* url)
{
#define SHORTEST_DB_URL "s://a/b"
#define SHORTEST_DB_URL_LEN (sizeof(SHORTEST_DB_URL) - 1)

        enum state {
                ST_SCHEME,     /* Scheme part */
                ST_SLASH1,     /* First slash */
                ST_SLASH2,     /* Second slash */
                ST_USER_HOST,  /* Username or hostname */
                ST_PASS_PORT,  /* Password or port part */
                ST_HOST,       /* Hostname part */
                ST_PORT,       /* Port part */
                ST_DB          /* Database part */
        };

        enum state st;
        unsigned int len, i;
        const char* begin;
        char* prev_token;

        prev_token = 0;

        if (!id || !url || !url->s) {
                goto err;
        }
        
        len = url->len;
        if (len < SHORTEST_DB_URL_LEN) {
                goto err;
        }
        
        /* Initialize all attributes to 0 */
        memset(id, 0, sizeof(struct db_id));
        st = ST_SCHEME;
        begin = url->s;

        for(i = 0; i < len; i++) {
                switch(st) {
                case ST_SCHEME:
                        switch(url->s[i]) {
                        case ':':
                                st = ST_SLASH1;
                                if (dupl_string(&id->scheme, begin, url->s + i) < 0) goto err;
                                break;
                        }
                        break;

                case ST_SLASH1:
                        switch(url->s[i]) {
                        case '/':
                                st = ST_SLASH2;
                                break;

                        default:
                                goto err;
                        }
                        break;

                case ST_SLASH2:
                        switch(url->s[i]) {
                        case '/':
                                st = ST_USER_HOST;
                                begin = url->s + i + 1;
                                break;
                                
                        default:
                                goto err;
                        }
                        break;

                case ST_USER_HOST:
                        switch(url->s[i]) {
                        case '@':
                                st = ST_HOST;
                                if (dupl_string(&id->username, begin, url->s + i) < 0) goto err;
                                begin = url->s + i + 1;
                                break;

                        case ':':
                                st = ST_PASS_PORT;
                                if (dupl_string(&prev_token, begin, url->s + i) < 0) goto err;
                                begin = url->s + i + 1;
                                break;

                        case '/':
                                if (dupl_string(&id->host, begin, url->s + i) < 0) goto err;
                                if (dupl_string(&id->database, url->s + i + 1, url->s + len) < 0) goto err;
                                return 0;
                        }
                        break;

                case ST_PASS_PORT:
                        switch(url->s[i]) {
                        case '@':
                                st = ST_HOST;
                                id->username = prev_token;
                                prev_token = 0;
                                if (dupl_string(&id->password, begin, url->s + i) < 0) goto err;
                                begin = url->s + i + 1;
                                break;

                        case '/':
                                id->host = prev_token;
                                prev_token = 0;
                                id->port = str2s(begin, url->s + i - begin, 0);
                                if (dupl_string(&id->database, url->s + i + 1, url->s + len) < 0) goto err;
                                return 0;
                        }
                        break;

                case ST_HOST:
                        switch(url->s[i]) {
                        case ':':
                                st = ST_PORT;
                                if (dupl_string(&id->host, begin, url->s + i) < 0) goto err;
                                begin = url->s + i + 1;
                                break;

                        case '/':
                                if (dupl_string(&id->host, begin, url->s + i) < 0) goto err;
                                if (dupl_string(&id->database, url->s + i + 1, url->s + len) < 0) goto err;
                                return 0;
                        }
                        break;

                case ST_PORT:
                        switch(url->s[i]) {
                        case '/':
                                id->port = str2s(begin, url->s + i - begin, 0);
                                if (dupl_string(&id->database, url->s + i + 1, url->s + len) < 0) goto err;
                                return 0;
                        }
                        break;
                        
                case ST_DB:
                        break;
                }
        }

        if (st != ST_DB) goto err;
        return 0;

 err:
        if (!id) goto end;
        if (id->scheme) pkg_free(id->scheme);
        if (id->username) pkg_free(id->username);
        if (id->password) pkg_free(id->password);
        if (id->host) pkg_free(id->host);
        if (id->database) pkg_free(id->database);
        memset(id, 0, sizeof(struct db_id));
        if (prev_token) pkg_free(prev_token);
 end:
        return -1;
}


struct db_id* new_db_id(const str* url, db_pooling_t pooling)
{
        static int poolid=0;
        struct db_id* ptr;

        if (!url || !url->s) {
                LM_ERR("invalid parameter\n");
                return 0;
        }

        ptr = (struct db_id*)pkg_malloc(sizeof(struct db_id));
        if (!ptr) {
                LM_ERR("no private memory left\n");
                goto err;
        }
        memset(ptr, 0, sizeof(struct db_id));

        if (parse_db_url(ptr, url) < 0) {
                LM_ERR("error while parsing database URL: '%.*s' \n", url->len, url->s);
                goto err;
        }

        if (pooling == DB_POOLING_NONE) ptr->poolid = ++poolid;
        else ptr->poolid = 0;
        ptr->pid = my_pid();

        return ptr;

 err:
        if (ptr) pkg_free(ptr);
        return 0;
}


unsigned char cmp_db_id(const struct db_id* id1, const struct db_id* id2)
{
        if (!id1 || !id2) return 0;
        if (id1->port != id2->port) return 0;

        if (strcmp(id1->scheme, id2->scheme)) return 0;
        if (id1->username!=0 && id2->username!=0) {
                if (strcmp(id1->username, id2->username)) return 0;
        } else {
                if (id1->username!=0 || id2->username!=0) return 0;
        }
        if (id1->password!=0 && id2->password!=0) {
                if(strcmp(id1->password, id2->password)) return 0;
        } else {
                if (id1->password!=0 || id2->password!=0) return 0;
        }
        if (strcasecmp(id1->host, id2->host)) return 0;
        if (strcmp(id1->database, id2->database)) return 0;
        if(id1->pid!=id2->pid) {
                LM_DBG("identical DB URLs, but different DB connection pid [%d/%d]\n",
                                id1->pid, id2->pid);
                return 0;
        }
        if(id1->poolid!=id2->poolid) {
                LM_DBG("identical DB URLs, but different poolids [%d/%d]\n",
                                id1->poolid, id2->poolid);
                return 0;
        }
        return 1;
}


void free_db_id(struct db_id* id)
{
        if (!id) return;

        if (id->scheme) pkg_free(id->scheme);
        if (id->username) pkg_free(id->username);
        if (id->password) pkg_free(id->password);
        if (id->host) pkg_free(id->host);
        if (id->database) pkg_free(id->database);
        pkg_free(id);
}