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lighttpd2/src/modules/mod_scgi.c

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/*
* mod_scgi - connect to scgi backends for generating content
*
* Description:
* mod_scgi connects to a backend over tcp or unix sockets
*
* Setups:
* none
* Options:
* none
* Actions:
* scgi <socket> - connect to backend at <socket>
* socket: string, either "ip:port" or "unix:/path"
*
* Example config:
* scgi "127.0.0.1:9090"
*
* Author:
* Copyright (c) 2013 Stefan Bühler
*/
#include <lighttpd/base.h>
#include <lighttpd/plugin_core.h>
#include <lighttpd/backends.h>
#include <lighttpd/stream_http_response.h>
LI_API gboolean mod_scgi_init(liModules *mods, liModule *mod);
LI_API gboolean mod_scgi_free(liModules *mods, liModule *mod);
typedef struct scgi_connection scgi_connection;
typedef struct scgi_context scgi_context;
struct scgi_context {
gint refcount;
liBackendPool *pool;
GString *socket_str;
};
struct scgi_connection {
scgi_context *ctx;
liBackendConnection *bcon;
gpointer simple_socket_data;
};
/**********************************************************************************/
static gboolean append_key_value_pair(GByteArray *a, const gchar *key, size_t keylen, const gchar *val, size_t valuelen) {
const guint8 z = 0;
g_byte_array_append(a, (const guint8*) key, keylen);
g_byte_array_append(a, &z, 1);
g_byte_array_append(a, (const guint8*) val, valuelen);
g_byte_array_append(a, &z, 1);
return TRUE;
}
static void scgi_env_add(GByteArray *buf, liEnvironmentDup *envdup, const gchar *key, size_t keylen, const gchar *val, size_t valuelen) {
GString *sval;
if (NULL != (sval = li_environment_dup_pop(envdup, key, keylen))) {
append_key_value_pair(buf, key, keylen, GSTR_LEN(sval));
} else {
append_key_value_pair(buf, key, keylen, val, valuelen);
}
}
static void scgi_env_create(liVRequest *vr, liEnvironmentDup *envdup, GByteArray* buf) {
liConInfo *coninfo = vr->coninfo;
GString *tmp = vr->wrk->tmp_str;
g_assert(vr->request.content_length >= 0);
if (vr->request.content_length >= 0) {
g_string_printf(tmp, "%" LI_GOFFSET_MODIFIER "i", vr->request.content_length);
scgi_env_add(buf, envdup, CONST_STR_LEN("CONTENT_LENGTH"), GSTR_LEN(tmp));
}
scgi_env_add(buf, envdup, CONST_STR_LEN("SCGI"), CONST_STR_LEN("1"));
scgi_env_add(buf, envdup, CONST_STR_LEN("SERVER_SOFTWARE"), GSTR_LEN(CORE_OPTIONPTR(LI_CORE_OPTION_SERVER_TAG).string));
scgi_env_add(buf, envdup, CONST_STR_LEN("SERVER_NAME"), GSTR_LEN(vr->request.uri.host));
scgi_env_add(buf, envdup, CONST_STR_LEN("GATEWAY_INTERFACE"), CONST_STR_LEN("CGI/1.1"));
{
guint port = 0;
switch (coninfo->local_addr.addr->plain.sa_family) {
case AF_INET: port = coninfo->local_addr.addr->ipv4.sin_port; break;
#ifdef HAVE_IPV6
case AF_INET6: port = coninfo->local_addr.addr->ipv6.sin6_port; break;
#endif
}
if (port) {
g_string_printf(tmp, "%u", htons(port));
scgi_env_add(buf, envdup, CONST_STR_LEN("SERVER_PORT"), GSTR_LEN(tmp));
}
}
scgi_env_add(buf, envdup, CONST_STR_LEN("SERVER_ADDR"), GSTR_LEN(coninfo->local_addr_str));
{
guint port = 0;
switch (coninfo->remote_addr.addr->plain.sa_family) {
case AF_INET: port = coninfo->remote_addr.addr->ipv4.sin_port; break;
#ifdef HAVE_IPV6
case AF_INET6: port = coninfo->remote_addr.addr->ipv6.sin6_port; break;
#endif
}
if (port) {
g_string_printf(tmp, "%u", htons(port));
scgi_env_add(buf, envdup, CONST_STR_LEN("REMOTE_PORT"), GSTR_LEN(tmp));
}
}
scgi_env_add(buf, envdup, CONST_STR_LEN("REMOTE_ADDR"), GSTR_LEN(coninfo->remote_addr_str));
scgi_env_add(buf, envdup, CONST_STR_LEN("SCRIPT_NAME"), GSTR_LEN(vr->request.uri.path));
scgi_env_add(buf, envdup, CONST_STR_LEN("PATH_INFO"), GSTR_LEN(vr->physical.pathinfo));
if (vr->physical.pathinfo->len) {
g_string_truncate(tmp, 0);
g_string_append_len(tmp, GSTR_LEN(vr->physical.doc_root));
g_string_append_len(tmp, GSTR_LEN(vr->physical.pathinfo));
scgi_env_add(buf, envdup, CONST_STR_LEN("PATH_TRANSLATED"), GSTR_LEN(tmp));
}
scgi_env_add(buf, envdup, CONST_STR_LEN("SCRIPT_FILENAME"), GSTR_LEN(vr->physical.path));
scgi_env_add(buf, envdup, CONST_STR_LEN("DOCUMENT_ROOT"), GSTR_LEN(vr->physical.doc_root));
scgi_env_add(buf, envdup, CONST_STR_LEN("REQUEST_URI"), GSTR_LEN(vr->request.uri.raw_orig_path));
if (!g_string_equal(vr->request.uri.raw_orig_path, vr->request.uri.raw_path)) {
scgi_env_add(buf, envdup, CONST_STR_LEN("REDIRECT_URI"), GSTR_LEN(vr->request.uri.raw_path));
}
scgi_env_add(buf, envdup, CONST_STR_LEN("QUERY_STRING"), GSTR_LEN(vr->request.uri.query));
scgi_env_add(buf, envdup, CONST_STR_LEN("REQUEST_METHOD"), GSTR_LEN(vr->request.http_method_str));
scgi_env_add(buf, envdup, CONST_STR_LEN("REDIRECT_STATUS"), CONST_STR_LEN("200")); /* if php is compiled with --force-redirect */
switch (vr->request.http_version) {
case LI_HTTP_VERSION_1_1:
scgi_env_add(buf, envdup, CONST_STR_LEN("SERVER_PROTOCOL"), CONST_STR_LEN("HTTP/1.1"));
break;
case LI_HTTP_VERSION_1_0:
default:
scgi_env_add(buf, envdup, CONST_STR_LEN("SERVER_PROTOCOL"), CONST_STR_LEN("HTTP/1.0"));
break;
}
if (coninfo->is_ssl) {
scgi_env_add(buf, envdup, CONST_STR_LEN("HTTPS"), CONST_STR_LEN("on"));
}
}
static void fix_header_name(GString *str) {
guint i, len = str->len;
gchar *s = str->str;
for (i = 0; i < len; i++) {
if (g_ascii_isalpha(s[i])) {
s[i] = g_ascii_toupper(s[i]);
} else if (!g_ascii_isdigit(s[i])) {
s[i] = '_';
}
}
}
static void scgi_send_env(liVRequest *vr, liChunkQueue *out) {
GByteArray *buf = g_byte_array_sized_new(0);
liEnvironmentDup *envdup;
GString *tmp = vr->wrk->tmp_str;
envdup = li_environment_make_dup(&vr->env);
scgi_env_create(vr, envdup, buf);
{
GList *i;
for (i = vr->request.headers->entries.head; NULL != i; i = i->next) {
liHttpHeader *h = (liHttpHeader*) i->data;
const GString hkey = li_const_gstring(h->data->str, h->keylen);
g_string_truncate(tmp, 0);
if (!li_strncase_equal(&hkey, CONST_STR_LEN("CONTENT-TYPE"))) {
g_string_append_len(tmp, CONST_STR_LEN("HTTP_"));
}
g_string_append_len(tmp, h->data->str, h->keylen);
fix_header_name(tmp);
scgi_env_add(buf, envdup, GSTR_LEN(tmp), h->data->str + h->keylen+2, h->data->len - (h->keylen+2));
}
}
{
GHashTableIter i;
gpointer key, val;
g_hash_table_iter_init(&i, envdup->table);
while (g_hash_table_iter_next(&i, &key, &val)) {
append_key_value_pair(buf, GSTR_LEN((GString*) key), GSTR_LEN((GString*) val));
}
}
li_environment_dup_free(envdup);
g_string_printf(tmp, "%u:", buf->len);
li_chunkqueue_append_mem(out, GSTR_LEN(tmp));
{
const guint8 c = ',';
g_byte_array_append(buf, &c, 1);
}
li_chunkqueue_append_bytearr(out, buf);
}
/**********************************************************************************/
static void scgi_backend_free(liBackendPool *bpool) {
liBackendConfig *config = (liBackendConfig*) bpool->config;
li_sockaddr_clear(&config->sock_addr);
g_slice_free(liBackendConfig, config);
}
static liBackendCallbacks scgi_backend_cbs = {
/* backend_detach_thread */ NULL,
/* backend_attach_thread */ NULL,
/* backend_new */ NULL,
/* backend_close */ NULL,
scgi_backend_free
};
static scgi_context* scgi_context_new(liServer *srv, GString *dest_socket) {
liSocketAddress saddr;
scgi_context* ctx;
liBackendConfig *config;
saddr = li_sockaddr_from_string(dest_socket, 0);
if (NULL == saddr.addr) {
ERROR(srv, "Invalid socket address '%s'", dest_socket->str);
return NULL;
}
config = g_slice_new0(liBackendConfig);
config->callbacks = &scgi_backend_cbs;
config->sock_addr = saddr;
config->max_connections = 0;
config->idle_timeout = 5;
config->connect_timeout = 5;
config->wait_timeout = 5;
config->disable_time = 0;
config->max_requests = 1;
config->watch_for_close = TRUE;
ctx = g_slice_new0(scgi_context);
ctx->refcount = 1;
ctx->pool = li_backend_pool_new(config);
ctx->socket_str = g_string_new_len(GSTR_LEN(dest_socket));
return ctx;
}
static void scgi_context_release(scgi_context *ctx) {
if (!ctx) return;
assert(g_atomic_int_get(&ctx->refcount) > 0);
if (g_atomic_int_dec_and_test(&ctx->refcount)) {
li_backend_pool_free(ctx->pool);
g_string_free(ctx->socket_str, TRUE);
g_slice_free(scgi_context, ctx);
}
}
static void scgi_context_acquire(scgi_context *ctx) {
assert(g_atomic_int_get(&ctx->refcount) > 0);
g_atomic_int_inc(&ctx->refcount);
}
static void scgi_io_cb(liIOStream *stream, liIOStreamEvent event) {
scgi_connection *con = stream->data;
liWorker *wrk = li_worker_from_iostream(stream);
li_stream_simple_socket_io_cb_with_context(stream, event, &con->simple_socket_data);
switch (event) {
case LI_IOSTREAM_DESTROY:
li_stream_simple_socket_close(stream, FALSE);
li_event_io_set_fd(&con->bcon->watcher, -1);
li_backend_put(wrk, con->ctx->pool, con->bcon, TRUE);
con->bcon = NULL;
scgi_context_release(con->ctx);
g_slice_free(scgi_connection, con);
stream->data = NULL;
return;
default:
break;
}
if ((NULL == stream->stream_in.out || stream->stream_in.out->is_closed) &&
!(NULL == stream->stream_out.out || stream->stream_out.out->is_closed)) {
stream->stream_out.out->is_closed = TRUE;
li_stream_again_later(&stream->stream_out);
}
}
static void scgi_connection_new(liVRequest *vr, liBackendConnection *bcon, scgi_context *ctx) {
scgi_connection* scon = g_slice_new0(scgi_connection);
liIOStream *iostream;
liStream *outplug;
liStream *http_out;
scgi_context_acquire(ctx);
scon->ctx = ctx;
scon->bcon = bcon;
iostream = li_iostream_new(vr->wrk, li_event_io_fd(&bcon->watcher), scgi_io_cb, scon);
/* insert scgi header before actual data */
outplug = li_stream_plug_new(&vr->wrk->loop);
li_stream_connect(outplug, &iostream->stream_out);
scgi_send_env(vr, outplug->out);
li_stream_notify_later(outplug);
http_out = li_stream_http_response_handle(&iostream->stream_in, vr, TRUE, FALSE);
li_vrequest_handle_indirect(vr, NULL);
li_vrequest_indirect_connect(vr, outplug, http_out);
li_iostream_release(iostream);
li_stream_release(outplug);
li_stream_release(http_out);
}
/**********************************************************************************/
static liHandlerResult scgi_handle_abort(liVRequest *vr, gpointer param, gpointer context) {
scgi_context *ctx = (scgi_context*) param;
liBackendWait *bwait = context;
if (bwait != NULL) {
li_backend_wait_stop(vr, ctx->pool, &bwait);
}
return LI_HANDLER_GO_ON;
}
static liHandlerResult scgi_handle(liVRequest *vr, gpointer param, gpointer *context) {
liBackendWait *bwait = (liBackendWait*) *context;
liBackendConnection *bcon = NULL;
scgi_context *ctx = (scgi_context*) param;
if (li_vrequest_is_handled(vr)) return LI_HANDLER_GO_ON;
LI_VREQUEST_WAIT_FOR_REQUEST_BODY(vr);
if (vr->request.content_length < 0) {
VR_ERROR(vr, "%s", "scgi can't handle progressive uploads. enable request body buffering!");
return LI_HANDLER_ERROR;
}
switch (li_backend_get(vr, ctx->pool, &bcon, &bwait)) {
case LI_BACKEND_SUCCESS:
assert(NULL == bwait);
assert(NULL != bcon);
*context = bwait;
break;
case LI_BACKEND_WAIT:
assert(NULL != bwait);
*context = bwait;
return LI_HANDLER_WAIT_FOR_EVENT;
case LI_BACKEND_TIMEOUT:
li_vrequest_backend_dead(vr);
return LI_HANDLER_GO_ON;
}
scgi_connection_new(vr, bcon, ctx);
return LI_HANDLER_GO_ON;
}
static void scgi_free(liServer *srv, gpointer param) {
scgi_context *ctx = (scgi_context*) param;
UNUSED(srv);
scgi_context_release(ctx);
}
static liAction* scgi_create(liServer *srv, liWorker *wrk, liPlugin* p, liValue *val, gpointer userdata) {
scgi_context *ctx;
UNUSED(wrk); UNUSED(userdata); UNUSED(p);
if (val->type != LI_VALUE_STRING) {
ERROR(srv, "%s", "scgi expects a string as parameter");
return FALSE;
}
ctx = scgi_context_new(srv, val->data.string);
if (NULL == ctx) return NULL;
return li_action_new_function(scgi_handle, scgi_handle_abort, scgi_free, ctx);
}
static const liPluginOption options[] = {
{ NULL, 0, 0, NULL }
};
static const liPluginAction actions[] = {
{ "scgi", scgi_create, NULL },
{ NULL, NULL, NULL }
};
static const liPluginSetup setups[] = {
{ NULL, NULL, NULL }
};
static void plugin_init(liServer *srv, liPlugin *p, gpointer userdata) {
UNUSED(srv); UNUSED(userdata);
p->options = options;
p->actions = actions;
p->setups = setups;
}
gboolean mod_scgi_init(liModules *mods, liModule *mod) {
MODULE_VERSION_CHECK(mods);
mod->config = li_plugin_register(mods->main, "mod_scgi", plugin_init, NULL);
return mod->config != NULL;
}
gboolean mod_scgi_free(liModules *mods, liModule *mod) {
if (mod->config)
li_plugin_free(mods->main, mod->config);
return TRUE;
}
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