1 /* 2 * mod_sockproxy - socket-level proxy support for lighttpd 3 * 4 * Copyright(c) 2018 Glenn Strauss gstrauss()gluelogic.com All rights reserved 5 * License: BSD 3-clause (same as lighttpd) 6 */ 7 #include "first.h" 8 9 #include <stdlib.h> 10 #include <string.h> 11 12 #include "gw_backend.h" 13 typedef gw_plugin_config plugin_config; 14 typedef gw_plugin_data plugin_data; 15 typedef gw_handler_ctx handler_ctx; 16 17 #include "base.h" 18 #include "array.h" 19 #include "buffer.h" 20 #include "log.h" 21 22 /** 23 * 24 * socket proxy (with optional buffering) 25 * 26 */ 27 28 static void mod_sockproxy_merge_config_cpv(plugin_config * const pconf, const config_plugin_value_t * const cpv) { 29 switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */ 30 case 0: /* sockproxy.server */ 31 if (cpv->vtype == T_CONFIG_LOCAL) { 32 gw_plugin_config * const gw = cpv->v.v; 33 pconf->exts = gw->exts; 34 pconf->exts_auth = gw->exts_auth; 35 pconf->exts_resp = gw->exts_resp; 36 } 37 break; 38 case 1: /* sockproxy.balance */ 39 /*if (cpv->vtype == T_CONFIG_LOCAL)*//*always true here for this param*/ 40 pconf->balance = (int)cpv->v.u; 41 break; 42 case 2: /* sockproxy.debug */ 43 pconf->debug = (int)cpv->v.u; 44 break; 45 default:/* should not happen */ 46 return; 47 } 48 } 49 50 static void mod_sockproxy_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv) { 51 do { 52 mod_sockproxy_merge_config_cpv(pconf, cpv); 53 } while ((++cpv)->k_id != -1); 54 } 55 56 static void mod_sockproxy_patch_config(request_st * const r, plugin_data * const p) { 57 memcpy(&p->conf, &p->defaults, sizeof(plugin_config)); 58 for (int i = 1, used = p->nconfig; i < used; ++i) { 59 if (config_check_cond(r, (uint32_t)p->cvlist[i].k_id)) 60 mod_sockproxy_merge_config(&p->conf,p->cvlist+p->cvlist[i].v.u2[0]); 61 } 62 } 63 64 SETDEFAULTS_FUNC(mod_sockproxy_set_defaults) { 65 static const config_plugin_keys_t cpk[] = { 66 { CONST_STR_LEN("sockproxy.server"), 67 T_CONFIG_ARRAY_KVARRAY, 68 T_CONFIG_SCOPE_CONNECTION } 69 ,{ CONST_STR_LEN("sockproxy.balance"), 70 T_CONFIG_STRING, 71 T_CONFIG_SCOPE_CONNECTION } 72 ,{ CONST_STR_LEN("sockproxy.debug"), 73 T_CONFIG_INT, 74 T_CONFIG_SCOPE_CONNECTION } 75 ,{ NULL, 0, 76 T_CONFIG_UNSET, 77 T_CONFIG_SCOPE_UNSET } 78 }; 79 80 plugin_data * const p = p_d; 81 if (!config_plugin_values_init(srv, p, cpk, "mod_sockproxy")) 82 return HANDLER_ERROR; 83 84 /* process and validate config directives 85 * (init i to 0 if global context; to 1 to skip empty global context) */ 86 for (int i = !p->cvlist[0].v.u2[1]; i < p->nconfig; ++i) { 87 config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0]; 88 gw_plugin_config *gw = NULL; 89 for (; -1 != cpv->k_id; ++cpv) { 90 switch (cpv->k_id) { 91 case 0: /* sockproxy.server */ 92 gw = ck_calloc(1, sizeof(gw_plugin_config)); 93 if (!gw_set_defaults_backend(srv, p, cpv->v.a, gw, 0, 94 cpk[cpv->k_id].k)) { 95 gw_plugin_config_free(gw); 96 return HANDLER_ERROR; 97 } 98 cpv->v.v = gw; 99 cpv->vtype = T_CONFIG_LOCAL; 100 break; 101 case 1: /* sockproxy.balance */ 102 cpv->v.u = (unsigned int)gw_get_defaults_balance(srv, cpv->v.b); 103 break; 104 case 2: /* sockproxy.debug */ 105 break; 106 default:/* should not happen */ 107 break; 108 } 109 } 110 111 /* disable check-local for all exts (default enabled) */ 112 if (gw && gw->exts) { /*(check after gw_set_defaults_backend())*/ 113 gw_exts_clear_check_local(gw->exts); 114 } 115 } 116 117 /* default is 0 */ 118 /*p->defaults.balance = (unsigned int)gw_get_defaults_balance(srv, NULL);*/ 119 120 /* initialize p->defaults from global config context */ 121 if (p->nconfig > 0 && p->cvlist->v.u2[1]) { 122 const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0]; 123 if (-1 != cpv->k_id) 124 mod_sockproxy_merge_config(&p->defaults, cpv); 125 } 126 127 return HANDLER_GO_ON; 128 } 129 130 131 static handler_t sockproxy_create_env_connect(handler_ctx *hctx) { 132 request_st * const r = hctx->r; 133 r->resp_body_started = 1; 134 gw_set_transparent(hctx); 135 http_response_upgrade_read_body_unknown(r); 136 137 plugin_stats_inc("sockproxy.requests"); 138 return HANDLER_GO_ON; 139 } 140 141 142 static handler_t mod_sockproxy_connection_accept(connection *con, void *p_d) { 143 request_st * const r = &con->request; 144 plugin_data *p = p_d; 145 handler_t rc; 146 147 if (NULL != r->handler_module) return HANDLER_GO_ON; 148 149 mod_sockproxy_patch_config(r, p); 150 if (NULL == p->conf.exts) return HANDLER_GO_ON; 151 152 /*(fake r->uri.path for matching purposes in gw_check_extension())*/ 153 buffer_copy_string_len(&r->uri.path, CONST_STR_LEN("/")); 154 155 rc = gw_check_extension(r, p, 1, 0); 156 if (HANDLER_GO_ON != rc) return rc; 157 158 if (r->handler_module == p->self) { 159 handler_ctx *hctx = r->plugin_ctx[p->id]; 160 hctx->opts.backend = BACKEND_PROXY; 161 hctx->create_env = sockproxy_create_env_connect; 162 hctx->response = chunk_buffer_acquire(); 163 r->http_status = -1; /*(skip HTTP processing)*/ 164 r->http_version = HTTP_VERSION_UNSET; 165 } 166 167 return HANDLER_GO_ON; 168 } 169 170 171 __attribute_cold__ 172 int mod_sockproxy_plugin_init(plugin *p); 173 int mod_sockproxy_plugin_init(plugin *p) { 174 p->version = LIGHTTPD_VERSION_ID; 175 p->name = "sockproxy"; 176 177 p->init = gw_init; 178 p->cleanup = gw_free; 179 p->set_defaults = mod_sockproxy_set_defaults; 180 p->handle_request_reset = gw_handle_request_reset; 181 p->handle_connection_accept= mod_sockproxy_connection_accept; 182 p->handle_subrequest = gw_handle_subrequest; 183 p->handle_trigger = gw_handle_trigger; 184 p->handle_waitpid = gw_handle_waitpid_cb; 185 186 return 0; 187 } 188