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cachedb_id.c
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cachedb_id.c
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/*
* Copyright (C) 2011 OpenSIPS Solutions
*
* This file is part of opensips, a free SIP server.
*
* opensips 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.
*
* opensips 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*
* history:
* ---------
* 2011-09-xx created (vlad-paiu)
*/
#include "cachedb_id.h"
#include "../dprint.h"
#include "../mem/mem.h"
#include "../ut.h"
#include <stdlib.h>
#include <string.h>
/**
* Duplicate a string
* \param dst destination
* \param begin start of the string
* \param end end of the string
*/
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;
}
/**
* Parse a database URL of form
* scheme[:group]://[username[:password]@]hostname[:port]/database[?options]
*
* \param id filled id struct
* \param url parsed URL
* \return 0 if parsing was successful and -1 otherwise
*/
static int parse_cachedb_url(struct cachedb_id* id, const str* url)
{
#define SHORTEST_DB_URL "s://"
#define SHORTEST_DB_URL_LEN (sizeof(SHORTEST_DB_URL) - 1)
enum state {
ST_SCHEME, /* Scheme part */
ST_SLASH1, /* First slash */
ST_SLASH1_GRP, /* Group Name or first / */
ST_SLASH2, /* Second slash */
ST_USER_HOST, /* Username or hostname */
ST_PASS_PORT, /* Password or port part */
ST_HOST, /* Hostname part */
ST_HOST6, /* Hostname part IPv6 */
ST_PORT, /* Port part */
ST_DB, /* Database part */
ST_OPTIONS /* Options part */
};
enum state st;
unsigned int len, i, ipv6_flag=0;
char* begin;
char* prev_token,*start_host=NULL,*start_prev=NULL,*ptr;
prev_token = 0;
if (!id || !url || !url->s) {
goto err;
}
len = url->len;
if (len < SHORTEST_DB_URL_LEN) {
goto err;
}
LM_DBG("parsing [%.*s]\n",url->len,url->s);
/* Initialize all attributes to 0 */
memset(id, 0, sizeof(struct cachedb_id));
st = ST_SCHEME;
begin = url->s;
if (dupl_string(&id->initial_url,url->s,url->s+url->len) < 0)
goto err;
for(i = 0; i < len; i++) {
switch(st) {
case ST_SCHEME:
switch(url->s[i]) {
case ':':
st = ST_SLASH1_GRP;
if (dupl_string(&id->scheme, begin, url->s + i) < 0) goto err;
begin = url->s+i+1;
break;
}
break;
case ST_SLASH1_GRP:
switch(url->s[i]) {
case ':':
st = ST_SLASH1;
if (dupl_string(&id->group_name,begin,url->s+i) < 0) goto err;
break;
case '/':
/* a '/' not right after ':' ?? */
if (begin!=(url->s+i))
goto err;
st = ST_SLASH2;
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;
start_prev = begin;
begin = url->s + i + 1;
break;
case '[':
st = ST_HOST6;
begin = url->s + i + 1;
break;
case '/':
if (dupl_string(&id->host, begin, url->s + i) < 0) goto err;
begin = url->s + i + 1;
st = ST_DB;
break;
}
break;
case ST_PASS_PORT:
switch(url->s[i]) {
case '@':
st = ST_HOST;
id->username = prev_token;
if (dupl_string(&id->password, begin, url->s + i) < 0) goto err;
begin = url->s + i + 1;
break;
case '/':
id->host = prev_token;
id->port = str2s(begin, url->s + i - begin, 0);
begin = url->s + i + 1;
st = ST_DB;
break;
case ',':
st=ST_HOST;
start_host=start_prev;
id->flags |= CACHEDB_ID_MULTIPLE_HOSTS;
break;
}
break;
case ST_HOST:
switch(url->s[i]) {
case '[':
st = ST_HOST6;
begin = url->s + i + 1;
break;
case ':':
LM_DBG("in host - :\n");
if (id->flags & CACHEDB_ID_MULTIPLE_HOSTS) {
LM_DBG("multiple hosts, skipping\n");
break;
}
st = ST_PORT;
if (dupl_string(&id->host, begin, url->s + i - ipv6_flag) < 0) goto err;
start_host = begin;
begin = url->s + i + 1;
break;
case '/':
if (id->flags & CACHEDB_ID_MULTIPLE_HOSTS)
ptr = start_host;
else
ptr = begin;
if (dupl_string(&id->host, ptr, url->s + i - ipv6_flag) < 0) goto err;
begin = url->s + i + 1;
st = ST_DB;
break;
}
break;
case ST_HOST6:
switch(url->s[i]) {
case ']':
ipv6_flag = 1;
st = ST_HOST;
break;
}
break;
case ST_PORT:
switch(url->s[i]) {
case '/':
id->port = str2s(begin, url->s + i - begin, 0);
begin = url->s + i + 1;
st = ST_DB;
break;
case ',':
st = ST_HOST;
pkg_free(id->host);
id->host=NULL;
begin = start_host;
id->flags |= CACHEDB_ID_MULTIPLE_HOSTS;
break;
}
break;
case ST_DB:
switch(url->s[i]) {
case '?':
if (dupl_string(&id->database, begin, url->s + i) < 0) goto err;
if (url->s + i + 1 == url->s + len) {
st = ST_OPTIONS;
break;
}
if (dupl_string(&id->extra_options, url->s + i + 1, url->s + len) < 0) goto err;
return 0;
}
break;
case ST_OPTIONS:
break;
}
}
if (st == ST_PORT) {
if (url->s + i - begin == 0)
goto err;
id->port = str2s(begin, url->s + i - begin, 0);
return 0;
}
if (st == ST_DB) {
if (begin < url->s + len &&
dupl_string(&id->database, begin, url->s + len) < 0) goto err;
return 0;
}
if (st == ST_USER_HOST && begin == url->s+url->len) {
/* Not considered an error - to cope with modules that
* offer cacheDB functionality backed up by OpenSIPS mem */
id->flags |= CACHEDB_ID_NO_URL;
LM_DBG("Just scheme, no actual url\n");
return 0;
}
if (st != ST_DB && st != ST_OPTIONS) goto err;
return 0;
err:
if (id && id->initial_url) pkg_free(id->initial_url);
if (id && id->scheme) pkg_free(id->scheme);
if (id && id->username) pkg_free(id->username);
if (id && id->password) pkg_free(id->password);
if (id && id->host) pkg_free(id->host);
if (id && id->database) pkg_free(id->database);
if (id && id->extra_options) pkg_free(id->extra_options);
if (prev_token && prev_token != id->host && prev_token != id->username)
pkg_free(prev_token);
return -1;
}
/**
* Create a new connection identifier
* \param url database URL
* \return connection identifier, or zero on error
*/
struct cachedb_id* new_cachedb_id(const str* url)
{
struct cachedb_id* ptr;
if (!url || !url->s) {
LM_ERR("invalid parameter\n");
return 0;
}
ptr = pkg_malloc(sizeof(struct cachedb_id));
if (!ptr) {
LM_ERR("no private memory left\n");
goto err;
}
memset(ptr, 0, sizeof(struct cachedb_id));
if (parse_cachedb_url(ptr, url) < 0) {
LM_ERR("error while parsing database URL: '%s'\n",
db_url_escape(url));
goto err;
}
return ptr;
err:
if (ptr) pkg_free(ptr);
return 0;
}
/**
* Compare two connection identifiers
* \param id1 first identifier
* \param id2 second identifier
* \return one if both are equal, zero otherwise
*/
int cmp_cachedb_id(struct cachedb_id* id1, struct cachedb_id* id2)
{
if (!id1 || !id2) return 0;
/* connections with different flags never match */
if (id1->flags != id2->flags) return 0;
/* different scehemes - never match */
if (strcmp(id1->scheme,id2->scheme)) return 0;
if (id1->flags == CACHEDB_ID_NO_URL) {
/* no url - always match, based just on scheme */
return 1;
}
/* different group names - never match */
if ((id1->group_name == NULL && id2->group_name != NULL) ||
(id1->group_name != NULL && id2->group_name == NULL))
return 0;
if (id1->group_name && strcmp(id1->group_name,id2->group_name)) return 0;
/* different usernames - never match */
if ((id1->username == NULL && id2->username != NULL) ||
(id1->username != NULL && id2->username == NULL))
return 0;
if (id1->username && strcmp(id1->username,id2->username)) return 0;
/* different passwords - never match */
if ((id1->password == NULL && id2->password != NULL) ||
(id1->password != NULL && id2->password == NULL))
return 0;
if (id1->password && strcmp(id1->password,id2->password)) return 0;
if (strcmp(id1->host,id2->host)) return 0;
if ((id1->database == NULL && id2->database != NULL) ||
(id1->database != NULL && id2->database == NULL))
return 0;
if (id1->database && strcmp(id1->database,id2->database)) return 0;
if ((!id1->extra_options && id2->extra_options) ||
(id1->extra_options && !id2->extra_options))
return 0;
if (id1->extra_options &&
strcmp(id1->extra_options, id2->extra_options)) return 0;
if (id1->flags != CACHEDB_ID_MULTIPLE_HOSTS) {
/* also check port as it is not included in host member */
if (id1->port != id2->port) return 0;
}
return 1;
}
/**
* Free a connection identifier
* \param id identifier
*/
void free_cachedb_id(struct cachedb_id* id)
{
if (!id) return;
if (id->initial_url) pkg_free(id->initial_url);
if (id->scheme) pkg_free(id->scheme);
if (id->group_name) pkg_free(id->group_name);
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);
if (id->extra_options) pkg_free(id->extra_options);
pkg_free(id);
}