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/*
* mod_sockproxy - socket-level proxy support for lighttpd
*
* Copyright(c) 2018 Glenn Strauss gstrauss()gluelogic.com All rights reserved
* License: BSD 3-clause (same as lighttpd)
*/
#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"
/**
*
* socket proxy (with optional buffering)
*
*/
static void mod_sockproxy_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: /* sockproxy.server */
if (cpv->vtype == T_CONFIG_LOCAL) {
gw_plugin_config * const gw = cpv->v.v;
pconf->exts = gw->exts;
pconf->exts_auth = gw->exts_auth;
pconf->exts_resp = gw->exts_resp;
}
break;
case 1: /* sockproxy.balance */
/*if (cpv->vtype == T_CONFIG_LOCAL)*//*always true here for this param*/
pconf->balance = (int)cpv->v.u;
break;
case 2: /* sockproxy.debug */
pconf->debug = (int)cpv->v.u;
break;
default:/* should not happen */
return;
}
}
static void mod_sockproxy_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv) {
do {
mod_sockproxy_merge_config_cpv(pconf, cpv);
} while ((++cpv)->k_id != -1);
}
static void mod_sockproxy_patch_config(request_st * const r, plugin_data * const p) {
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_sockproxy_merge_config(&p->conf,p->cvlist+p->cvlist[i].v.u2[0]);
}
}
SETDEFAULTS_FUNC(mod_sockproxy_set_defaults) {
static const config_plugin_keys_t cpk[] = {
{ CONST_STR_LEN("sockproxy.server"),
T_CONFIG_ARRAY_KVARRAY,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("sockproxy.balance"),
T_CONFIG_STRING,
T_CONFIG_SCOPE_CONNECTION }
,{ CONST_STR_LEN("sockproxy.debug"),
T_CONFIG_INT,
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_sockproxy"))
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];
gw_plugin_config *gw = NULL;
for (; -1 != cpv->k_id; ++cpv) {
switch (cpv->k_id) {
case 0: /* sockproxy.server */
gw = ck_calloc(1, sizeof(gw_plugin_config));
if (!gw_set_defaults_backend(srv, p, cpv->v.a, gw, 0,
cpk[cpv->k_id].k)) {
gw_plugin_config_free(gw);
return HANDLER_ERROR;
}
cpv->v.v = gw;
cpv->vtype = T_CONFIG_LOCAL;
break;
case 1: /* sockproxy.balance */
cpv->v.u = (unsigned int)gw_get_defaults_balance(srv, cpv->v.b);
break;
case 2: /* sockproxy.debug */
break;
default:/* should not happen */
break;
}
}
/* disable check-local for all exts (default enabled) */
if (gw && gw->exts) { /*(check after gw_set_defaults_backend())*/
gw_exts_clear_check_local(gw->exts);
}
}
/* default is 0 */
/*p->defaults.balance = (unsigned int)gw_get_defaults_balance(srv, NULL);*/
/* 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_sockproxy_merge_config(&p->defaults, cpv);
}
return HANDLER_GO_ON;
}
static handler_t sockproxy_create_env_connect(handler_ctx *hctx) {
request_st * const r = hctx->r;
r->resp_body_started = 1;
gw_set_transparent(hctx);
http_response_upgrade_read_body_unknown(r);
plugin_stats_inc("sockproxy.requests");
return HANDLER_GO_ON;
}
static handler_t mod_sockproxy_connection_accept(connection *con, void *p_d) {
request_st * const r = &con->request;
plugin_data *p = p_d;
handler_t rc;
if (NULL != r->handler_module) return HANDLER_GO_ON;
mod_sockproxy_patch_config(r, p);
if (NULL == p->conf.exts) return HANDLER_GO_ON;
/*(fake r->uri.path for matching purposes in gw_check_extension())*/
buffer_copy_string_len(&r->uri.path, CONST_STR_LEN("/"));
rc = gw_check_extension(r, p, 1, 0);
if (HANDLER_GO_ON != rc) return rc;
if (r->handler_module == p->self) {
handler_ctx *hctx = r->plugin_ctx[p->id];
hctx->opts.backend = BACKEND_PROXY;
hctx->create_env = sockproxy_create_env_connect;
hctx->response = chunk_buffer_acquire();
r->http_status = -1; /*(skip HTTP processing)*/
r->http_version = HTTP_VERSION_UNSET;
}
return HANDLER_GO_ON;
}
__attribute_cold__
__declspec_dllexport__
int mod_sockproxy_plugin_init(plugin *p);
int mod_sockproxy_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = "sockproxy";
p->init = gw_init;
p->cleanup = gw_free;
p->set_defaults = mod_sockproxy_set_defaults;
p->handle_request_reset = gw_handle_request_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;
return 0;
}
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