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Docs ModMySQLVhost ยป mod_mysql_vhost.c

Modified source code, instructions here: http://redmine.lighttpd.net/issues/2163 - tronox@hotmail.com, 2013-11-03 09:01

 
#include <unistd.h>
#include <stdio.h>
// end added by Shinrai
#include <string.h>
#include <stdlib.h>
#include "response.h"
// end added by Shinrai
#include <errno.h>
#include <fcntl.h>
#include <strings.h>

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef HAVE_MYSQL
#include <mysql.h>
#endif

#include "plugin.h"
#include "log.h"

#include "stat_cache.h"
#ifdef DEBUG_MOD_MYSQL_VHOST
#define DEBUG
#endif

// added by Shinrai
char *
str_replace ( const char *string, const char *substr, const char *replacement ){
char *tok = NULL;
char *newstr = NULL;
char *oldstr = NULL;
char *head = NULL;
/* if either substr or replacement is NULL, duplicate string a let caller handle it */
if ( substr == NULL || replacement == NULL ) return strdup (string);
newstr = strdup (string);
head = newstr;
while ( (tok = strstr ( head, substr ))){
oldstr = newstr;
newstr = malloc ( strlen ( oldstr ) - strlen ( substr ) + strlen ( replacement ) + 1 );
/*failed to alloc mem, free old string and return NULL */
if ( newstr == NULL ){
free (oldstr);
return NULL;
}
memcpy ( newstr, oldstr, tok - oldstr );
memcpy ( newstr + (tok - oldstr), replacement, strlen ( replacement ) );
memcpy ( newstr + (tok - oldstr) + strlen( replacement ), tok + strlen ( substr ), strlen ( oldstr ) - strlen ( substr ) - ( tok - oldstr ) );
memset ( newstr + strlen ( oldstr ) - strlen ( substr ) + strlen ( replacement ) , 0, 1 );
/* move back head right after the last replacement */
head = newstr + (tok - oldstr) + strlen( replacement );
free (oldstr);
}
return newstr;
}
// end added by Shinrai
/*
* Plugin for lighttpd to use MySQL
* for domain to directory lookups,
* i.e virtual hosts (vhosts).
*
* Optionally sets fcgi_offset and fcgi_arg
* in preparation for fcgi.c to handle
* per-user fcgi chroot jails.
*
* /ada@riksnet.se 2004-12-06
*/

#ifdef HAVE_MYSQL
typedef struct {
MYSQL *mysql;

buffer *mydb;
buffer *myuser;
buffer *mypass;
buffer *mysock;

buffer *hostname;
unsigned short port;

buffer *mysql_pre;
buffer *mysql_post;
} plugin_config;

/* global plugin data */
typedef struct {
PLUGIN_DATA;

buffer *tmp_buf;

plugin_config **config_storage;

plugin_config conf;
} plugin_data;

/* per connection plugin data */
typedef struct {
buffer *server_name;
buffer *document_root;
buffer *fcgi_arg;
unsigned fcgi_offset;
} plugin_connection_data;

/* init the plugin data */
INIT_FUNC(mod_mysql_vhost_init) {
plugin_data *p;

p = calloc(1, sizeof(*p));

p->tmp_buf = buffer_init();

return p;
}

/* cleanup the plugin data */
SERVER_FUNC(mod_mysql_vhost_cleanup) {
plugin_data *p = p_d;

UNUSED(srv);

#ifdef DEBUG
log_error_write(srv, __FILE__, __LINE__, "ss",
"mod_mysql_vhost_cleanup", p ? "yes" : "NO");
#endif
if (!p) return HANDLER_GO_ON;

if (p->config_storage) {
size_t i;
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s = p->config_storage[i];

if (!s) continue;

mysql_close(s->mysql);

buffer_free(s->mydb);
buffer_free(s->myuser);
buffer_free(s->mypass);
buffer_free(s->mysock);
buffer_free(s->mysql_pre);
buffer_free(s->mysql_post);
buffer_free(s->hostname);

free(s);
}
free(p->config_storage);
}
buffer_free(p->tmp_buf);

free(p);

return HANDLER_GO_ON;
}

/* handle the plugin per connection data */
static void* mod_mysql_vhost_connection_data(server *srv, connection *con, void *p_d)
{
plugin_data *p = p_d;
plugin_connection_data *c = con->plugin_ctx[p->id];

UNUSED(srv);

#ifdef DEBUG
log_error_write(srv, __FILE__, __LINE__, "ss",
"mod_mysql_connection_data", c ? "old" : "NEW");
#endif

if (c) return c;
c = calloc(1, sizeof(*c));

c->server_name = buffer_init();
c->document_root = buffer_init();
c->fcgi_arg = buffer_init();
c->fcgi_offset = 0;

return con->plugin_ctx[p->id] = c;
}

/* destroy the plugin per connection data */
CONNECTION_FUNC(mod_mysql_vhost_handle_connection_close) {
plugin_data *p = p_d;
plugin_connection_data *c = con->plugin_ctx[p->id];

UNUSED(srv);

#ifdef DEBUG
log_error_write(srv, __FILE__, __LINE__, "ss",
"mod_mysql_vhost_handle_connection_close", c ? "yes" : "NO");
#endif

if (!c) return HANDLER_GO_ON;

buffer_free(c->server_name);
buffer_free(c->document_root);
buffer_free(c->fcgi_arg);
c->fcgi_offset = 0;

free(c);

con->plugin_ctx[p->id] = NULL;
return HANDLER_GO_ON;
}

/* set configuration values */
SERVER_FUNC(mod_mysql_vhost_set_defaults) {
plugin_data *p = p_d;

// char *qmark;
size_t i = 0;

config_values_t cv[] = {
{ "mysql-vhost.db", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_SERVER },
{ "mysql-vhost.user", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_SERVER },
{ "mysql-vhost.pass", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_SERVER },
{ "mysql-vhost.sock", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_SERVER },
{ "mysql-vhost.sql", NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_SERVER },
{ "mysql-vhost.hostname", NULL, T_CONFIG_STRING,T_CONFIG_SCOPE_SERVER },
{ "mysql-vhost.port", NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_SERVER },
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
};

p->config_storage = calloc(1, srv->config_context->used * sizeof(specific_config *));

for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s;
buffer *sel;


s = calloc(1, sizeof(plugin_config));
s->mydb = buffer_init();
s->myuser = buffer_init();
s->mypass = buffer_init();
s->mysock = buffer_init();
s->hostname = buffer_init();
s->port = 0; /* default port for mysql */
sel = buffer_init();
s->mysql = NULL;

s->mysql_pre = buffer_init();
s->mysql_post = buffer_init();

cv[0].destination = s->mydb;
cv[1].destination = s->myuser;
cv[2].destination = s->mypass;
cv[3].destination = s->mysock;
cv[4].destination = sel;
cv[5].destination = s->hostname;
cv[6].destination = &(s->port);

p->config_storage[i] = s;

if (config_insert_values_global(srv,
((data_config *)srv->config_context->data[i])->value,
cv)) return HANDLER_ERROR;

s->mysql_pre = buffer_init();
s->mysql_post = buffer_init();

// Old code from Lighttpd developers
// if (sel->used && (qmark = strchr(sel->ptr, '?'))) {
// *qmark = '\0';
// buffer_copy_string(s->mysql_pre, sel->ptr);
// buffer_copy_string(s->mysql_post, qmark+1);
// } else {
// buffer_copy_string_buffer(s->mysql_pre, sel);
// }
// added by Shinrai
buffer_copy_string_buffer(s->mysql_pre, sel);
// end added by Shinrai
/* required:
* - username
* - database
*
* optional:
* - password, default: empty
* - socket, default: mysql default
* - hostname, if set overrides socket
* - port, default: 3306
*/

/* all have to be set */
if (!(buffer_is_empty(s->myuser) ||
buffer_is_empty(s->mydb))) {
my_bool reconnect = 1;

if (NULL == (s->mysql = mysql_init(NULL))) {
log_error_write(srv, __FILE__, __LINE__, "s", "mysql_init() failed, exiting...");

return HANDLER_ERROR;
}

#if MYSQL_VERSION_ID >= 50013
/* in mysql versions above 5.0.3 the reconnect flag is off by default */
mysql_options(s->mysql, MYSQL_OPT_RECONNECT, &reconnect);
#endif

#define FOO(x) (s->x->used ? s->x->ptr : NULL)

#if MYSQL_VERSION_ID >= 40100
/* CLIENT_MULTI_STATEMENTS first appeared in 4.1 */
if (!mysql_real_connect(s->mysql, FOO(hostname), FOO(myuser), FOO(mypass),
FOO(mydb), s->port, FOO(mysock), CLIENT_MULTI_STATEMENTS)) {
#else
if (!mysql_real_connect(s->mysql, FOO(hostname), FOO(myuser), FOO(mypass),
FOO(mydb), s->port, FOO(mysock), 0)) {
#endif
log_error_write(srv, __FILE__, __LINE__, "s", mysql_error(s->mysql));

return HANDLER_ERROR;
}
#undef FOO

#if 0
/* set close_on_exec for mysql the hard way */
/* Note: this only works as it is done during startup, */
/* otherwise we cannot be sure that mysql is fd i-1 */
{ int fd;
if (-1 != (fd = open("/dev/null", 0))) {
close(fd);
#ifdef FD_CLOEXEC
fcntl(fd-1, F_SETFD, FD_CLOEXEC);
#endif
} }
#else
#ifdef FD_CLOEXEC
fcntl(s->mysql->net.fd, F_SETFD, FD_CLOEXEC);
#endif
#endif
}
}

return HANDLER_GO_ON;
}

#define PATCH(x) \
p->conf.x = s->x;
static int mod_mysql_vhost_patch_connection(server *srv, connection *con, plugin_data *p) {
size_t i, j;
plugin_config *s = p->config_storage[0];

PATCH(mysql_pre);
PATCH(mysql_post);
#ifdef HAVE_MYSQL
PATCH(mysql);
#endif

/* skip the first, the global context */
for (i = 1; i < srv->config_context->used; i++) {
data_config *dc = (data_config *)srv->config_context->data[i];
s = p->config_storage[i];

/* condition didn't match */
if (!config_check_cond(srv, con, dc)) continue;

/* merge config */
for (j = 0; j < dc->value->used; j++) {
data_unset *du = dc->value->data[j];

if (buffer_is_equal_string(du->key, CONST_STR_LEN("mysql-vhost.sql"))) {
PATCH(mysql_pre);
PATCH(mysql_post);
}
}

if (s->mysql) {
PATCH(mysql);
}
}

return 0;
}
#undef PATCH


/* handle document root request */
CONNECTION_FUNC(mod_mysql_vhost_handle_docroot) {
plugin_data *p = p_d;
plugin_connection_data *c;
stat_cache_entry *sce;

char *rel_url;
buffer *uri;
buffer *username;
buffer *temp_path;
unsigned cols;
MYSQL_ROW row;
MYSQL_RES *result = NULL;

/* no host specified? */
if (!con->uri.authority->used) return HANDLER_GO_ON;

mod_mysql_vhost_patch_connection(srv, con, p);

if (!p->conf.mysql) return HANDLER_GO_ON;

/* sets up connection data if not done yet */
c = mod_mysql_vhost_connection_data(srv, con, p_d);

/* check if cached this connection */
if (c->server_name->used && /* con->uri.authority->used && */
buffer_is_equal(c->server_name, con->uri.authority)) goto GO_ON;

/* build and run SQL query */
/* Old Lttpd Developed Code
buffer_copy_string_buffer(p->tmp_buf, p->conf.mysql_pre);
if (p->conf.mysql_post->used) {
buffer_append_string_buffer(p->tmp_buf, con->uri.authority);
buffer_append_string_buffer(p->tmp_buf, p->conf.mysql_post);
}
*/
// added by Shinrai
// char *basestring = "";
// #ifdef HAVE_MYSQL_REAL_ESCAPE_STRING
// char *sqlquery = mysql_real_escape_string(p->conf.mysql, basestring, con->uri.authority->ptr, strlen(con->uri.authority->ptr));
// #else
// char *sqlquery = mysql_escape_string(basestring, con->uri.authority->ptr, strlen(con->uri.authority->ptr));
// #endif
buffer_copy_string(p->tmp_buf, str_replace(p->conf.mysql_pre->ptr,"?",con->uri.authority->ptr));
if (con->uri.path->ptr[0] == '/' && con->uri.path->ptr[1] == '~' && con->uri.path->ptr[2] != '/'){
username = buffer_init();
uri = buffer_init();
if (NULL == (rel_url = strchr(con->uri.path->ptr + 2, '/'))) {
/* / is missing -> redirect to .../ as we are a user - DIRECTORY ! :) */
http_response_redirect_to_directory(srv, con);

return HANDLER_FINISHED;
}

buffer_copy_string(uri, "/~@@");
buffer_copy_string_len(username, con->uri.path->ptr + 2, rel_url - (con->uri.path->ptr + 2));
buffer_copy_string(uri, str_replace(uri->ptr,"@@",username->ptr));
// Clean up the connection parameters so stuff is found correctly.
buffer_copy_string(con->uri.path, str_replace(con->uri.path->ptr,uri->ptr,""));
buffer_copy_string(con->physical.rel_path, str_replace(con->physical.rel_path->ptr,uri->ptr,""));
// Modify the SQL to replace @@ with the username found.
buffer_copy_string(p->tmp_buf, str_replace(p->tmp_buf->ptr,"@@",username->ptr));
}
// end added by Shinrai
if (mysql_query(p->conf.mysql, p->tmp_buf->ptr)) {
log_error_write(srv, __FILE__, __LINE__, "s", mysql_error(p->conf.mysql));
goto ERR500;
}
result = mysql_store_result(p->conf.mysql);
cols = mysql_num_fields(result);
row = mysql_fetch_row(result);
// Check for null value, seems to crash.
// if ((!row || row[0] == NULL) || cols < 1) {
if (!row || cols < 1) {
/* no such virtual host */
mysql_free_result(result);
#if MYSQL_VERSION_ID >= 40100
while (mysql_next_result(p->conf.mysql) == 0);
#endif
return HANDLER_GO_ON;
}

/* sanity check that really is a directory */
buffer_copy_string(p->tmp_buf, row[0]);
BUFFER_APPEND_SLASH(p->tmp_buf);

if (HANDLER_ERROR == stat_cache_get_entry(srv, con, p->tmp_buf, &sce)) {
log_error_write(srv, __FILE__, __LINE__, "sb", strerror(errno), p->tmp_buf);
goto ERR500;
}
if (!S_ISDIR(sce->st.st_mode)) {
log_error_write(srv, __FILE__, __LINE__, "sb", "Not a directory", p->tmp_buf);
goto ERR500;
}

/* cache the data */
buffer_copy_string_buffer(c->server_name, con->uri.authority);
buffer_copy_string_buffer(c->document_root, p->tmp_buf);

/* fcgi_offset and fcgi_arg are optional */
if (cols > 1 && row[1]) {
c->fcgi_offset = atoi(row[1]);

if (cols > 2 && row[2]) {
buffer_copy_string(c->fcgi_arg, row[2]);
} else {
c->fcgi_arg->used = 0;
}
} else {
c->fcgi_offset = c->fcgi_arg->used = 0;
}
mysql_free_result(result);
#if MYSQL_VERSION_ID >= 40100
while (mysql_next_result(p->conf.mysql) == 0);
#endif

/* fix virtual server and docroot */
GO_ON: buffer_copy_string_buffer(con->server_name, c->server_name);
buffer_copy_string_buffer(con->physical.doc_root, c->document_root);
// added by Shinrai
if (uri->used) {
temp_path = buffer_init();
buffer_copy_string_buffer(temp_path, c->document_root);
if (NULL != (rel_url = strchr(con->physical.rel_path->ptr + 2, '/'))) {
buffer_append_string(temp_path, rel_url + 1); /* skip the / */
}
// Clean up the physical path. We needed the database lookup to find the document_root before we could do this.
buffer_copy_string_buffer(con->physical.path, temp_path);
}
// end added by Shinrai

#ifdef DEBUG
log_error_write(srv, __FILE__, __LINE__, "sbbdb",
result ? "NOT CACHED" : "cached",
con->server_name, con->physical.doc_root,
c->fcgi_offset, c->fcgi_arg);
#endif
return HANDLER_GO_ON;

ERR500: if (result) mysql_free_result(result);
#if MYSQL_VERSION_ID >= 40100
while (mysql_next_result(p->conf.mysql) == 0);
#endif
con->http_status = 500; /* Internal Error */
con->mode = DIRECT;
return HANDLER_FINISHED;
}

/* this function is called at dlopen() time and inits the callbacks */
int mod_mysql_vhost_plugin_init(plugin *p);
int mod_mysql_vhost_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("mysql_vhost");

p->init = mod_mysql_vhost_init;
p->cleanup = mod_mysql_vhost_cleanup;
p->connection_reset = mod_mysql_vhost_handle_connection_close;

p->set_defaults = mod_mysql_vhost_set_defaults;
p->handle_docroot = mod_mysql_vhost_handle_docroot;

return 0;
}
#else
/* we don't have mysql support, this plugin does nothing */
int mod_mysql_vhost_plugin_init(plugin *p);
int mod_mysql_vhost_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("mysql_vhost");

return 0;
}
#endif
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