错误现象

22:29:55 [86] DBG:db_mysql:db_mysql_connect: opening connection: mysql://xxxx:xxxx@:gsf@1202]@10.10.10.10/opensips
22:29:55 [86] ERROR:db_mysql:db_mysql_connect: driver error(2005): Unknown MySQL server host ':gsf@1202]@10.10.10.10' (2)
22:29:55 [86] ERROR:db_mysql:db_mysql_new_connection: initial connect failed
22:29:55 [86] ERROR:core:db_do_init: could not add connection to the pool
22:29:55 [86] ERROR:uri:mod_init: Could not connect to database

原因分析

opensips中的db_default_url的解析是自己实现的，2.x源码在db/db_id.c

如果你的密码存在特殊字符，如@，！等，这个解析就存在bug

根据它源码的注释，它是可以通过[] 来实现转义的，

scheme://[username[:password]@]hostname[:port]/database

但是实际上功能上存在bug。

我把它的源码部分贴出来，如果遇到问题的，可以自己试着跑一下

#include <stdio.h>
#include <stdlib.h>
#include <memory.h>typedef struct __str {char* s; /**< string as char array */int len; /**< string length, not including null-termination */
} str;/** Structure representing a database ID */
struct db_id {char* scheme;        /**< URL scheme */char* username;      /**< Username, case sensitive */char* password;      /**< Password, case sensitive */char* host;          /**< Host or IP, case insensitive */unsigned short port; /**< Port number */char* database;      /**< Database, case sensitive */str url;          /**< Pointer to the original url> */
};unsigned short str2s(const char* s, unsigned int len, int *err)
{unsigned short ret;int i;unsigned char *limit;unsigned char *str;/*init*/str=(unsigned char*)s;ret=i=0;limit=str+len;for(;str<limit ;str++){if ( (*str <= '9' ) && (*str >= '0') ){ret=ret*10+*str-'0';i++;if (i>5) goto error_digits;}else{//error unknown chargoto error_char;}}if (err) *err=0;return ret;error_digits:printf("too many letters in [%.*s]\n", (int)len, s);if (err) *err=1;return 0;error_char:printf("unexpected char %c in %.*s\n", *str, (int)len, s);if (err) *err=1;return 0;
}static int dupl_string(char** dst, const char* begin, const char* end)
{if (*dst) free(*dst);*dst = 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://[username[:password]@]hostname[:port]/database** \param id filled id struct* \param url parsed URL* \return 0 if parsing was successful and -1 otherwise*/
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_HOST6,      /* Hostname part IPv6 */ST_PORT,       /* Port part */ST_DB          /* Database part */};enum state st;unsigned int len, i, ipv6_flag=0;const char* begin;char* prev_token = NULL;if (!id || !url || !url->s) {return -1;}len = url->len;if (len < SHORTEST_DB_URL_LEN) {return -1;}/* 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 '[':st = ST_HOST6;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 = NULL;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 = NULL;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_HOST6;begin = url->s + i + 1;break;case ':':st = ST_PORT;if (dupl_string(&id->host, begin, url->s + i - ipv6_flag) < 0) goto err;begin = url->s + i + 1;break;case '/':if (dupl_string(&id->host, begin, url->s + i - ipv6_flag) < 0) goto err;if (dupl_string(&id->database, url->s + i + 1, url->s + len) < 0) goto err;return 0;}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);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->scheme) free(id->scheme);if (id->username) free(id->username);if (id->password) free(id->password);if (id->host) free(id->host);if (id->database) free(id->database);if (prev_token) free(prev_token);return -1;
}int main() {struct db_id id;str url;url.s =  "mysql://root:gsf1202@10.10.10.10/opensips";url.len = strlen(url.s);parse_db_url(&id, &url);printf("scheme: %s    \n""usename: %s    \n""password: %s  \n""host : %s     \n""database: %s  \n""port :  %d",id.scheme, id.username, id.password, id.host,id.database, id.port);return 0;
}

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opensips中db_default_url解析存在的bug

错误现象

原因分析

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