lighttpd 1.4.x https://www.lighttpd.net/
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/*
* mod_vhostdb_dbi - virtual hosts mapping from backend DBI interface
*
* Copyright(c) 2017 Glenn Strauss gstrauss()gluelogic.com All rights reserved
* License: BSD 3-clause (same as lighttpd)
*/
#include "first.h"
#include <string.h>
#include <stdlib.h>
#include <dbi/dbi.h>
#include "mod_vhostdb_api.h"
#include "base.h"
#include "fdevent.h"
#include "log.h"
#include "plugin.h"
/*
* virtual host plugin using DBI for domain to directory lookups
*
* e.g.
* vhostdb.dbi = ( "sql" => "SELECT docroot FROM vhosts WHERE host='?'"
* "dbtype" => "sqlite3",
* "dbname" => "mydb.sqlite",
* "sqlite3_dbdir" => "/path/to/sqlite/dbs/" )
*/
typedef struct {
dbi_conn dbconn;
dbi_inst dbinst;
const buffer *sqlquery;
log_error_st *errh;
short reconnect_count;
} vhostdb_config;
typedef struct {
void *vdata;
} plugin_config;
typedef struct {
PLUGIN_DATA;
plugin_config defaults;
plugin_config conf;
} plugin_data;
/* used to reconnect to the database when we get disconnected */
static void mod_vhostdb_dbi_error_callback (dbi_conn dbconn, void *vdata)
{
vhostdb_config *dbconf = (vhostdb_config *)vdata;
const char *errormsg = NULL;
/*assert(dbconf->dbconn == dbconn);*/
while (++dbconf->reconnect_count <= 3) { /* retry */
if (0 == dbi_conn_connect(dbconn)) {
fdevent_setfd_cloexec(dbi_conn_get_socket(dbconn));
return;
}
}
dbi_conn_error(dbconn, &errormsg);
log_error(dbconf->errh,__FILE__,__LINE__,"dbi_conn_connect(): %s",errormsg);
}
static void mod_vhostdb_dbconf_free (void *vdata)
{
vhostdb_config *dbconf = (vhostdb_config *)vdata;
if (!dbconf) return;
dbi_conn_close(dbconf->dbconn);
dbi_shutdown_r(dbconf->dbinst);
free(dbconf);
}
static int mod_vhostdb_dbconf_setup (server *srv, const array *opts, void **vdata)
{
const buffer *sqlquery = NULL;
const buffer *dbtype=NULL, *dbname=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;
} else if (buffer_is_equal_caseless_string(&ds->key, CONST_STR_LEN("dbtype"))) {
dbtype = &ds->value;
}
}
}
/* required:
* - sql (sql query)
* - dbtype
* - dbname
*
* optional:
* - username, some databases don't require this (sqlite)
* - password, default: empty
* - socket, default: database type default
* - hostname, if set overrides socket
* - port, default: database default
* - encoding, default: database default
*/
if (sqlquery && !buffer_is_blank(sqlquery) && dbname && dbtype) {
/* create/initialise database */
vhostdb_config *dbconf;
dbi_inst dbinst = NULL;
dbi_conn dbconn;
if (dbi_initialize_r(NULL, &dbinst) < 1) {
log_error(srv->errh, __FILE__, __LINE__,
"dbi_initialize_r() failed. "
"Do you have the DBD for this db type installed?");
return -1;
}
dbconn = dbi_conn_new_r(dbtype->ptr, dbinst);
if (NULL == dbconn) {
log_error(srv->errh, __FILE__, __LINE__,
"dbi_conn_new_r() failed. "
"Do you have the DBD for this db type installed?");
dbi_shutdown_r(dbinst);
return -1;
}
/* set options */
for (size_t j = 0; j < opts->used; ++j) {
data_unset *du = opts->data[j];
const buffer *opt = &du->key;
if (!buffer_is_blank(opt)) {
if (du->type == TYPE_INTEGER) {
data_integer *di = (data_integer *)du;
dbi_conn_set_option_numeric(dbconn, opt->ptr, di->value);
} else if (du->type == TYPE_STRING) {
data_string *ds = (data_string *)du;
if (&ds->value != sqlquery && &ds->value != dbtype) {
dbi_conn_set_option(dbconn, opt->ptr, ds->value.ptr);
}
}
}
}
dbconf = (vhostdb_config *)calloc(1, sizeof(*dbconf));
dbconf->dbinst = dbinst;
dbconf->dbconn = dbconn;
dbconf->sqlquery = sqlquery;
dbconf->errh = srv->errh;
dbconf->reconnect_count = 0;
*vdata = dbconf;
/* used to automatically reconnect to the database */
dbi_conn_error_handler(dbconn, mod_vhostdb_dbi_error_callback, dbconf);
/* connect to database */
mod_vhostdb_dbi_error_callback(dbconn, dbconf);
if (dbconf->reconnect_count >= 3) {
mod_vhostdb_dbconf_free(dbconf);
return -1;
}
}
return 0;
}
static void mod_vhostdb_patch_config (request_st * const r, plugin_data * const p);
static int mod_vhostdb_dbi_query(request_st * const r, void *p_d, buffer *docroot)
{
plugin_data *p = (plugin_data *)p_d;
vhostdb_config *dbconf;
dbi_result result;
unsigned long long nrows;
int retry_count = 0;
/*(reuse buffer for sql query before generating docroot result)*/
buffer *sqlquery = docroot;
buffer_clear(sqlquery); /*(also resets docroot (alias))*/
mod_vhostdb_patch_config(r, 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 */
char *esc = NULL;
size_t len = dbi_conn_escape_string_copy(dbconf->dbconn,
r->uri.authority.ptr,&esc);
buffer_append_str2(sqlquery, b, (size_t)(d - b), esc, len);
free(esc);
if (0 == len) return -1;
} else {
d = dbconf->sqlquery->ptr + buffer_clen(dbconf->sqlquery);
buffer_append_string_len(sqlquery, b, (size_t)(d - b));
break;
}
}
/* reset our reconnect-attempt counter, this is a new query. */
dbconf->reconnect_count = 0;
do {
result = dbi_conn_query(dbconf->dbconn, sqlquery->ptr);
} while (!result && ++retry_count < 2);
buffer_clear(docroot); /*(reset buffer to store result)*/
if (!result) {
const char *errmsg;
dbi_conn_error(dbconf->dbconn, &errmsg);
log_error(r->conf.errh, __FILE__, __LINE__, "%s", errmsg);
return -1;
}
nrows = dbi_result_get_numrows(result);
if (nrows && nrows != DBI_ROW_ERROR && dbi_result_next_row(result)) {
buffer_copy_string(docroot, dbi_result_get_string_idx(result, 1));
} /* else no such virtual host */
dbi_result_free(result);
return 0;
}
INIT_FUNC(mod_vhostdb_init) {
static http_vhostdb_backend_t http_vhostdb_backend_dbi =
{ "dbi", mod_vhostdb_dbi_query, NULL };
plugin_data *p = calloc(1, sizeof(*p));
/* register http_vhostdb_backend_dbi */
http_vhostdb_backend_dbi.p_d = p;
http_vhostdb_backend_set(&http_vhostdb_backend_dbi);
return p;
}
FREE_FUNC(mod_vhostdb_cleanup) {
plugin_data * const p = p_d;
if (NULL == p->cvlist) return;
/* (init i to 0 if global context; to 1 to skip empty global context) */
for (int i = !p->cvlist[0].v.u2[1], used = p->nconfig; i < used; ++i) {
config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0];
for (; -1 != cpv->k_id; ++cpv) {
if (cpv->vtype != T_CONFIG_LOCAL || NULL == cpv->v.v) continue;
switch (cpv->k_id) {
case 0: /* vhostdb.<db> */
mod_vhostdb_dbconf_free(cpv->v.v);
break;
default:
break;
}
}
}
}
static void mod_vhostdb_merge_config_cpv(plugin_config * const pconf, const config_plugin_value_t * const cpv) {
switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */
case 0: /* vhostdb.<db> */
if (cpv->vtype == T_CONFIG_LOCAL)
pconf->vdata = cpv->v.v;
break;
default:/* should not happen */
return;
}
}
static void mod_vhostdb_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv) {
do {
mod_vhostdb_merge_config_cpv(pconf, cpv);
} while ((++cpv)->k_id != -1);
}
static void mod_vhostdb_patch_config(request_st * const r, plugin_data * const p) {
p->conf = p->defaults; /* copy small struct instead of memcpy() */
/*memcpy(&p->conf, &p->defaults, sizeof(plugin_config));*/
for (int i = 1, used = p->nconfig; i < used; ++i) {
if (config_check_cond(r, (uint32_t)p->cvlist[i].k_id))
mod_vhostdb_merge_config(&p->conf,p->cvlist + p->cvlist[i].v.u2[0]);
}
}
SETDEFAULTS_FUNC(mod_vhostdb_set_defaults) {
static const config_plugin_keys_t cpk[] = {
{ CONST_STR_LEN("vhostdb.dbi"),
T_CONFIG_ARRAY_KVANY,
T_CONFIG_SCOPE_CONNECTION }
,{ NULL, 0,
T_CONFIG_UNSET,
T_CONFIG_SCOPE_UNSET }
};
plugin_data * const p = p_d;
if (!config_plugin_values_init(srv, p, cpk, "mod_vhostdb_dbi"))
return HANDLER_ERROR;
/* process and validate config directives
* (init i to 0 if global context; to 1 to skip empty global context) */
for (int i = !p->cvlist[0].v.u2[1]; i < p->nconfig; ++i) {
config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0];
for (; -1 != cpv->k_id; ++cpv) {
switch (cpv->k_id) {
case 0: /* vhostdb.<db> */
if (cpv->v.a->used) {
if (0 != mod_vhostdb_dbconf_setup(srv, cpv->v.a, &cpv->v.v))
return HANDLER_ERROR;
if (NULL != cpv->v.v)
cpv->vtype = T_CONFIG_LOCAL;
}
break;
default:/* should not happen */
break;
}
}
}
/* initialize p->defaults from global config context */
if (p->nconfig > 0 && p->cvlist->v.u2[1]) {
const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0];
if (-1 != cpv->k_id)
mod_vhostdb_merge_config(&p->defaults, cpv);
}
return HANDLER_GO_ON;
}
int mod_vhostdb_dbi_plugin_init (plugin *p);
int mod_vhostdb_dbi_plugin_init (plugin *p)
{
p->version = LIGHTTPD_VERSION_ID;
p->name = "vhostdb_dbi";
p->init = mod_vhostdb_init;
p->cleanup = mod_vhostdb_cleanup;
p->set_defaults = mod_vhostdb_set_defaults;
return 0;
}