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 #include "status_counter.h" 22 23 /** 24 * 25 * socket proxy (with optional buffering) 26 * 27 */ 28 29 static void mod_sockproxy_merge_config_cpv(plugin_config * const pconf, const config_plugin_value_t * const cpv) { 30 switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */ 31 case 0: /* sockproxy.server */ 32 if (cpv->vtype == T_CONFIG_LOCAL) { 33 gw_plugin_config * const gw = cpv->v.v; 34 pconf->exts = gw->exts; 35 pconf->exts_auth = gw->exts_auth; 36 pconf->exts_resp = gw->exts_resp; 37 } 38 break; 39 case 1: /* sockproxy.balance */ 40 /*if (cpv->vtype == T_CONFIG_LOCAL)*//*always true here for this param*/ 41 pconf->balance = (int)cpv->v.u; 42 break; 43 case 2: /* sockproxy.debug */ 44 pconf->debug = (int)cpv->v.u; 45 break; 46 default:/* should not happen */ 47 return; 48 } 49 } 50 51 static void mod_sockproxy_merge_config(plugin_config * const pconf, const config_plugin_value_t *cpv) { 52 do { 53 mod_sockproxy_merge_config_cpv(pconf, cpv); 54 } while ((++cpv)->k_id != -1); 55 } 56 57 static void mod_sockproxy_patch_config(request_st * const r, plugin_data * const p) { 58 memcpy(&p->conf, &p->defaults, sizeof(plugin_config)); 59 for (int i = 1, used = p->nconfig; i < used; ++i) { 60 if (config_check_cond(r, (uint32_t)p->cvlist[i].k_id)) 61 mod_sockproxy_merge_config(&p->conf,p->cvlist+p->cvlist[i].v.u2[0]); 62 } 63 } 64 65 SETDEFAULTS_FUNC(mod_sockproxy_set_defaults) { 66 static const config_plugin_keys_t cpk[] = { 67 { CONST_STR_LEN("sockproxy.server"), 68 T_CONFIG_ARRAY_KVARRAY, 69 T_CONFIG_SCOPE_CONNECTION } 70 ,{ CONST_STR_LEN("sockproxy.balance"), 71 T_CONFIG_STRING, 72 T_CONFIG_SCOPE_CONNECTION } 73 ,{ CONST_STR_LEN("sockproxy.debug"), 74 T_CONFIG_INT, 75 T_CONFIG_SCOPE_CONNECTION } 76 ,{ NULL, 0, 77 T_CONFIG_UNSET, 78 T_CONFIG_SCOPE_UNSET } 79 }; 80 81 plugin_data * const p = p_d; 82 if (!config_plugin_values_init(srv, p, cpk, "mod_sockproxy")) 83 return HANDLER_ERROR; 84 85 /* process and validate config directives 86 * (init i to 0 if global context; to 1 to skip empty global context) */ 87 for (int i = !p->cvlist[0].v.u2[1]; i < p->nconfig; ++i) { 88 config_plugin_value_t *cpv = p->cvlist + p->cvlist[i].v.u2[0]; 89 gw_plugin_config *gw = NULL; 90 for (; -1 != cpv->k_id; ++cpv) { 91 switch (cpv->k_id) { 92 case 0: /* sockproxy.server */ 93 gw = calloc(1, sizeof(gw_plugin_config)); 94 force_assert(gw); 95 if (!gw_set_defaults_backend(srv, p, cpv->v.a, gw, 0, 96 cpk[cpv->k_id].k)) { 97 gw_plugin_config_free(gw); 98 return HANDLER_ERROR; 99 } 100 cpv->v.v = gw; 101 cpv->vtype = T_CONFIG_LOCAL; 102 break; 103 case 1: /* sockproxy.balance */ 104 cpv->v.u = (unsigned int)gw_get_defaults_balance(srv, cpv->v.b); 105 break; 106 case 2: /* sockproxy.debug */ 107 break; 108 default:/* should not happen */ 109 break; 110 } 111 } 112 113 /* disable check-local for all exts (default enabled) */ 114 if (gw && gw->exts) { /*(check after gw_set_defaults_backend())*/ 115 gw_exts_clear_check_local(gw->exts); 116 } 117 } 118 119 /* default is 0 */ 120 /*p->defaults.balance = (unsigned int)gw_get_defaults_balance(srv, NULL);*/ 121 122 /* initialize p->defaults from global config context */ 123 if (p->nconfig > 0 && p->cvlist->v.u2[1]) { 124 const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0]; 125 if (-1 != cpv->k_id) 126 mod_sockproxy_merge_config(&p->defaults, cpv); 127 } 128 129 return HANDLER_GO_ON; 130 } 131 132 133 static handler_t sockproxy_create_env_connect(handler_ctx *hctx) { 134 request_st * const r = hctx->r; 135 r->resp_body_started = 1; 136 gw_set_transparent(hctx); 137 http_response_upgrade_read_body_unknown(r); 138 139 status_counter_inc(CONST_STR_LEN("sockproxy.requests")); 140 return HANDLER_GO_ON; 141 } 142 143 144 static handler_t mod_sockproxy_connection_accept(connection *con, void *p_d) { 145 request_st * const r = &con->request; 146 plugin_data *p = p_d; 147 handler_t rc; 148 149 if (NULL != r->handler_module) return HANDLER_GO_ON; 150 151 mod_sockproxy_patch_config(r, p); 152 if (NULL == p->conf.exts) return HANDLER_GO_ON; 153 154 /*(fake r->uri.path for matching purposes in gw_check_extension())*/ 155 buffer_copy_string_len(&r->uri.path, CONST_STR_LEN("/")); 156 157 rc = gw_check_extension(r, p, 1, 0); 158 if (HANDLER_GO_ON != rc) return rc; 159 160 if (r->handler_module == p->self) { 161 handler_ctx *hctx = r->plugin_ctx[p->id]; 162 hctx->opts.backend = BACKEND_PROXY; 163 hctx->create_env = sockproxy_create_env_connect; 164 hctx->response = chunk_buffer_acquire(); 165 r->http_status = -1; /*(skip HTTP processing)*/ 166 } 167 168 return HANDLER_GO_ON; 169 } 170 171 172 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->connection_reset = gw_connection_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