mod_sockproxy - socket forwarding

(experimental)

src/Makefile.am

@@ -258,6 +258,11 @@ mod_proxy_la_SOURCES = mod_proxy.c
 mod_proxy_la_LDFLAGS = $(common_module_ldflags)
 mod_proxy_la_LIBADD = $(common_libadd)
 
+lib_LTLIBRARIES += mod_sockproxy.la
+mod_sockproxy_la_SOURCES = mod_sockproxy.c
+mod_sockproxy_la_LDFLAGS = $(common_module_ldflags)
+mod_sockproxy_la_LIBADD = $(common_libadd)
+
 lib_LTLIBRARIES += mod_ssi.la
 mod_ssi_la_SOURCES = mod_ssi_exprparser.c mod_ssi_expr.c mod_ssi.c
 mod_ssi_la_LDFLAGS = $(common_module_ldflags)

src/connections.c

@@ -1128,6 +1128,7 @@ connection *connection_accepted(server *srv, server_socket *srv_socket, sock_add
 			connection_close(srv, con);
 			return NULL;
 		}
+		if (con->http_status < 0) connection_set_state(srv, con, CON_STATE_WRITE);
 		return con;
 }
 

src/mod_sockproxy.c

@@ -0,0 +1,180 @@
+#include "first.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "gw_backend.h"
+typedef gw_plugin_config plugin_config;
+typedef gw_plugin_data   plugin_data;
+typedef gw_handler_ctx   handler_ctx;
+
+#include "base.h"
+#include "array.h"
+#include "buffer.h"
+#include "log.h"
+#include "status_counter.h"
+
+/**
+ *
+ * socket proxy (with optional buffering)
+ *
+ */
+
+SETDEFAULTS_FUNC(mod_sockproxy_set_defaults) {
+	plugin_data *p = p_d;
+	data_unset *du;
+	size_t i = 0;
+
+	config_values_t cv[] = {
+		{ "sockproxy.server",          NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION },       /* 0 */
+		{ "sockproxy.debug",           NULL, T_CONFIG_SHORT, T_CONFIG_SCOPE_CONNECTION },       /* 1 */
+		{ "sockproxy.balance",         NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION },       /* 2 */
+		{ NULL,                        NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
+	};
+
+	p->config_storage = calloc(1, srv->config_context->used * sizeof(plugin_config *));
+	force_assert(p->config_storage);
+
+	for (i = 0; i < srv->config_context->used; i++) {
+		data_config const* config = (data_config const*)srv->config_context->data[i];
+		plugin_config *s;
+
+		s = calloc(1, sizeof(plugin_config));
+		force_assert(s);
+		s->exts          = NULL;
+		s->exts_auth     = NULL;
+		s->exts_resp     = NULL;
+		s->debug         = 0;
+
+		cv[0].destination = NULL; /* T_CONFIG_LOCAL */
+		cv[1].destination = &(s->debug);
+		cv[2].destination = NULL; /* T_CONFIG_LOCAL */
+
+		p->config_storage[i] = s;
+
+		if (0 != config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) {
+			return HANDLER_ERROR;
+		}
+
+		du = array_get_element(config->value, "sockproxy.server");
+		if (!gw_set_defaults_backend(srv, (gw_plugin_data *)p, du, i, 0)) {
+			return HANDLER_ERROR;
+		}
+
+		du = array_get_element(config->value, "sockproxy.balance");
+		if (!gw_set_defaults_balance(srv, s, du)) {
+			return HANDLER_ERROR;
+		}
+
+		/* disable check-local for all exts (default enabled) */
+		if (s->exts) { /*(check after gw_set_defaults_backend())*/
+			for (size_t j = 0; j < s->exts->used; ++j) {
+				gw_extension *ex = s->exts->exts[j];
+				for (size_t n = 0; n < ex->used; ++n) {
+					ex->hosts[n]->check_local = 0;
+				}
+			}
+		}
+	}
+
+	return HANDLER_GO_ON;
+}
+
+
+static handler_t sockproxy_create_env_connect(server *srv, handler_ctx *hctx) {
+	connection *con = hctx->remote_conn;
+	con->file_started = 1;
+	gw_set_transparent(srv, hctx);
+	http_response_upgrade_read_body_unknown(srv, con);
+
+	status_counter_inc(srv, CONST_STR_LEN("sockproxy.requests"));
+	return HANDLER_GO_ON;
+}
+
+
+#define PATCH(x) \
+	p->conf.x = s->x;
+static int mod_sockproxy_patch_connection(server *srv, connection *con, plugin_data *p) {
+	size_t i, j;
+	plugin_config *s = p->config_storage[0];
+
+	PATCH(exts);
+	PATCH(exts_auth);
+	PATCH(exts_resp);
+	PATCH(debug);
+	PATCH(ext_mapping);
+	PATCH(balance);
+
+	/* 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("sockproxy.server"))) {
+				PATCH(exts);
+				PATCH(exts_auth);
+				PATCH(exts_resp);
+			} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("sockproxy.debug"))) {
+				PATCH(debug);
+			} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("sockproxy.balance"))) {
+				PATCH(balance);
+			}
+		}
+	}
+
+	return 0;
+}
+#undef PATCH
+
+static handler_t mod_sockproxy_connection_accept(server *srv, connection *con, void *p_d) {
+	plugin_data *p = p_d;
+	handler_t rc;
+
+	if (con->mode != DIRECT) return HANDLER_GO_ON;
+
+	mod_sockproxy_patch_connection(srv, con, p);
+	if (NULL == p->conf.exts) return HANDLER_GO_ON;
+
+	/*(fake con->uri.path for matching purposes in gw_check_extension())*/
+	buffer_copy_string_len(con->uri.path, CONST_STR_LEN("/"));
+
+	rc = gw_check_extension(srv, con, p, 1, 0);
+	if (HANDLER_GO_ON != rc) return rc;
+
+	if (con->mode == p->id) {
+		handler_ctx *hctx = con->plugin_ctx[p->id];
+		hctx->opts.backend = BACKEND_PROXY;
+		hctx->create_env = sockproxy_create_env_connect;
+		hctx->response = buffer_init();
+		con->http_status = -1; /*(skip HTTP processing)*/
+	}
+
+	return HANDLER_GO_ON;
+}
+
+
+int mod_sockproxy_plugin_init(plugin *p);
+int mod_sockproxy_plugin_init(plugin *p) {
+	p->version      = LIGHTTPD_VERSION_ID;
+	p->name         = buffer_init_string("sockproxy");
+
+	p->init         = gw_init;
+	p->cleanup      = gw_free;
+	p->set_defaults = mod_sockproxy_set_defaults;
+	p->connection_reset        = gw_connection_reset;
+	p->handle_connection_accept= mod_sockproxy_connection_accept;
+	p->handle_subrequest       = gw_handle_subrequest;
+	p->handle_trigger          = gw_handle_trigger;
+	p->handle_waitpid          = gw_handle_waitpid_cb;
+
+	p->data         = NULL;
+
+	return 0;
+}