lighttpd 1.4.x https://www.lighttpd.net/
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#include "first.h"
#include <libpq-fe.h>
#include <string.h>
#include <stdlib.h>
#include "base.h"
#include "http_vhostdb.h"
#include "log.h"
#include "plugin.h"
/*
* virtual host plugin using Postgres for domain to directory lookups
*/
typedef struct {
PGconn *dbconn;
buffer *sqlquery;
} vhostdb_config;
typedef struct {
void *vdata;
array *options;
} plugin_config;
typedef struct {
PLUGIN_DATA;
plugin_config **config_storage;
plugin_config conf;
} plugin_data;
static void mod_vhostdb_dbconf_free (void *vdata)
{
vhostdb_config *dbconf = (vhostdb_config *)vdata;
if (!dbconf) return;
PQfinish(dbconf->dbconn);
free(dbconf);
}
static int mod_vhostdb_dbconf_setup (server *srv, array *opts, void **vdata)
{
buffer *sqlquery = NULL;
const char *dbname=NULL, *user=NULL, *pass=NULL, *host=NULL, *port=NULL;
for (size_t i = 0; i < opts->used; ++i) {
const data_string *ds = (data_string *)opts->data[i];
if (ds->type == TYPE_STRING) {
if (buffer_is_equal_caseless_string(ds->key, CONST_STR_LEN("sql"))) {
sqlquery = ds->value;
} else if (buffer_is_equal_caseless_string(ds->key, CONST_STR_LEN("dbname"))) {
dbname = ds->value->ptr;
} else if (buffer_is_equal_caseless_string(ds->key, CONST_STR_LEN("user"))) {
user = ds->value->ptr;
} else if (buffer_is_equal_caseless_string(ds->key, CONST_STR_LEN("password"))) {
pass = ds->value->ptr;
} else if (buffer_is_equal_caseless_string(ds->key, CONST_STR_LEN("host"))) {
host = ds->value->ptr;
} else if (buffer_is_equal_caseless_string(ds->key, CONST_STR_LEN("port"))) {
port = ds->value->ptr;
}
}
}
/* required:
* - sql (sql query)
* - dbname
* - user (unless dbname is a pgsql conninfo URI)
*
* optional:
* - password, default: empty
* - hostname
* - port, default: 5432
*/
if (!buffer_string_is_empty(sqlquery) && NULL != dbname) {
vhostdb_config *dbconf;
PGconn *dbconn = PQsetdbLogin(host,port,NULL,NULL,dbname,user,pass);
if (NULL == dbconn) {
log_error_write(srv, __FILE__, __LINE__, "s",
"PGsetdbLogin() failed, exiting...");
return -1;
}
if (CONNECTION_OK != PQstatus(dbconn)) {
log_error_write(srv, __FILE__, __LINE__, "s",
"Failed to login to database, exiting...");
PQfinish(dbconn);
return -1;
}
/* Postgres sets FD_CLOEXEC on database socket descriptors */
dbconf = (vhostdb_config *)calloc(1, sizeof(*dbconf));
dbconf->dbconn = dbconn;
dbconf->sqlquery = sqlquery;
*vdata = dbconf;
}
return 0;
}
static void mod_vhostdb_patch_connection (server *srv, connection *con, plugin_data *p);
static int mod_vhostdb_pgsql_query(server *srv, connection *con, void *p_d, buffer *docroot)
{
plugin_data *p = (plugin_data *)p_d;
vhostdb_config *dbconf;
PGresult *res;
int cols, rows;
/*(reuse buffer for sql query before generating docroot result)*/
buffer *sqlquery = docroot;
buffer_string_set_length(sqlquery, 0); /*(also resets docroot (alias))*/
mod_vhostdb_patch_connection(srv, con, p);
if (NULL == p->conf.vdata) return 0; /*(after resetting docroot)*/
dbconf = (vhostdb_config *)p->conf.vdata;
for (char *b = dbconf->sqlquery->ptr, *d; *b; b = d+1) {
if (NULL != (d = strchr(b, '?'))) {
/* escape the uri.authority */
size_t len;
int err;
buffer_append_string_len(sqlquery, b, (size_t)(d - b));
buffer_string_prepare_append(sqlquery, buffer_string_length(con->uri.authority) * 2);
len = PQescapeStringConn(dbconf->dbconn,
sqlquery->ptr + buffer_string_length(sqlquery),
CONST_BUF_LEN(con->uri.authority), &err);
buffer_commit(sqlquery, len);
if (0 != err) return -1;
} else {
d = dbconf->sqlquery->ptr + buffer_string_length(dbconf->sqlquery);
buffer_append_string_len(sqlquery, b, (size_t)(d - b));
break;
}
}
res = PQexec(dbconf->dbconn, sqlquery->ptr);
buffer_string_set_length(docroot, 0); /*(reset buffer to store result)*/
if (PGRES_TUPLES_OK != PQresultStatus(res)) {
log_error_write(srv, __FILE__, __LINE__, "s",
PQerrorMessage(dbconf->dbconn));
PQclear(res);
return -1;
}
cols = PQnfields(res);
rows = PQntuples(res);
if (rows == 1 && cols >= 1) {
buffer_copy_string(docroot, PQgetvalue(res, 0, 0));
} /* else no such virtual host */
PQclear(res);
return 0;
}
INIT_FUNC(mod_vhostdb_init) {
static http_vhostdb_backend_t http_vhostdb_backend_pgsql =
{ "pgsql", mod_vhostdb_pgsql_query, NULL };
plugin_data *p = calloc(1, sizeof(*p));
/* register http_vhostdb_backend_pgsql */
http_vhostdb_backend_pgsql.p_d = p;
http_vhostdb_backend_set(&http_vhostdb_backend_pgsql);
return p;
}
FREE_FUNC(mod_vhostdb_cleanup) {
plugin_data *p = p_d;
if (!p) return HANDLER_GO_ON;
if (p->config_storage) {
for (size_t i = 0; i < srv->config_context->used; i++) {
plugin_config *s = p->config_storage[i];
if (!s) continue;
mod_vhostdb_dbconf_free(s->vdata);
array_free(s->options);
free(s);
}
free(p->config_storage);
}
free(p);
UNUSED(srv);
return HANDLER_GO_ON;
}
SETDEFAULTS_FUNC(mod_vhostdb_set_defaults) {
plugin_data *p = p_d;
config_values_t cv[] = {
{ "vhostdb.pgsql", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION },
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
};
p->config_storage = calloc(1, srv->config_context->used * sizeof(specific_config *));
for (size_t i = 0; i < srv->config_context->used; ++i) {
data_config const *config = (data_config const*)srv->config_context->data[i];
plugin_config *s = calloc(1, sizeof(plugin_config));
s->options = array_init();
cv[0].destination = s->options;
p->config_storage[i] = s;
if (config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) {
return HANDLER_ERROR;
}
if (!array_is_kvstring(s->options)) {
log_error_write(srv, __FILE__, __LINE__, "s",
"unexpected value for vhostdb.pgsql; expected list of \"option\" => \"value\"");
return HANDLER_ERROR;
}
if (s->options->used
&& 0 != mod_vhostdb_dbconf_setup(srv, s->options, &s->vdata)) {
return HANDLER_ERROR;
}
}
return HANDLER_GO_ON;
}
#define PATCH(x) \
p->conf.x = s->x;
static void mod_vhostdb_patch_connection (server *srv, connection *con, plugin_data *p)
{
plugin_config *s = p->config_storage[0];
PATCH(vdata);
/* skip the first, the global context */
for (size_t 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 (size_t j = 0; j < dc->value->used; ++j) {
data_unset *du = dc->value->data[j];
if (buffer_is_equal_string(du->key,CONST_STR_LEN("vhostdb.pgsql"))){
PATCH(vdata);
}
}
}
}
#undef PATCH
/* this function is called at dlopen() time and inits the callbacks */
int mod_vhostdb_pgsql_plugin_init (plugin *p);
int mod_vhostdb_pgsql_plugin_init (plugin *p)
{
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("vhostdb_pgsql");
p->init = mod_vhostdb_init;
p->cleanup = mod_vhostdb_cleanup;
p->set_defaults = mod_vhostdb_set_defaults;
return 0;
}