/* * Copyright (C) Igor Sysoev */ #include #include #include #if (NGX_HTTP_CACHE) static ngx_int_t ngx_http_upstream_cache(ngx_http_request_t *r, ngx_http_upstream_t *u); static ngx_int_t ngx_http_upstream_cache_send(ngx_http_request_t *r, ngx_http_upstream_t *u); static ngx_int_t ngx_http_upstream_cache_status(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data); #endif static void ngx_http_upstream_init_request(ngx_http_request_t *r); static void ngx_http_upstream_resolve_handler(ngx_resolver_ctx_t *ctx); static void ngx_http_upstream_rd_check_broken_connection(ngx_http_request_t *r); static void ngx_http_upstream_wr_check_broken_connection(ngx_http_request_t *r); static void ngx_http_upstream_check_broken_connection(ngx_http_request_t *r, ngx_event_t *ev); static void ngx_http_upstream_connect(ngx_http_request_t *r, ngx_http_upstream_t *u); static ngx_int_t ngx_http_upstream_reinit(ngx_http_request_t *r, ngx_http_upstream_t *u); static void ngx_http_upstream_send_request(ngx_http_request_t *r, ngx_http_upstream_t *u); static void ngx_http_upstream_send_request_handler(ngx_http_request_t *r, ngx_http_upstream_t *u); static void ngx_http_upstream_process_header(ngx_http_request_t *r, ngx_http_upstream_t *u); static ngx_int_t ngx_http_upstream_test_next(ngx_http_request_t *r, ngx_http_upstream_t *u); static ngx_int_t ngx_http_upstream_intercept_errors(ngx_http_request_t *r, ngx_http_upstream_t *u); static ngx_int_t ngx_http_upstream_test_connect(ngx_connection_t *c); static ngx_int_t ngx_http_upstream_process_headers(ngx_http_request_t *r, ngx_http_upstream_t *u); static void ngx_http_upstream_process_body_in_memory(ngx_http_request_t *r, ngx_http_upstream_t *u); static void ngx_http_upstream_send_response(ngx_http_request_t *r, ngx_http_upstream_t *u); static void ngx_http_upstream_process_non_buffered_downstream(ngx_http_request_t *r); static void ngx_http_upstream_process_non_buffered_upstream(ngx_http_request_t *r, ngx_http_upstream_t *u); static void ngx_http_upstream_process_non_buffered_request(ngx_http_request_t *r, ngx_uint_t do_write); static ngx_int_t ngx_http_upstream_non_buffered_filter_init(void *data); static ngx_int_t ngx_http_upstream_non_buffered_filter(void *data, ssize_t bytes); static void ngx_http_upstream_process_downstream(ngx_http_request_t *r); static void ngx_http_upstream_process_upstream(ngx_http_request_t *r, ngx_http_upstream_t *u); static void ngx_http_upstream_process_request(ngx_http_request_t *r); static void ngx_http_upstream_store(ngx_http_request_t *r, ngx_http_upstream_t *u); static void ngx_http_upstream_dummy_handler(ngx_http_request_t *r, ngx_http_upstream_t *u); static void ngx_http_upstream_next(ngx_http_request_t *r, ngx_http_upstream_t *u, ngx_uint_t ft_type); static void ngx_http_upstream_cleanup(void *data); static void ngx_http_upstream_finalize_request(ngx_http_request_t *r, ngx_http_upstream_t *u, ngx_int_t rc); static ngx_int_t ngx_http_upstream_process_header_line(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_process_content_length(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_process_set_cookie(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_process_cache_control(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_ignore_header_line(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_process_expires(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_process_accel_expires(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_process_limit_rate(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_process_buffering(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_process_charset(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_process_connection(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_process_transfer_encoding(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_copy_header_line(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_copy_multi_header_lines(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_copy_content_type(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_copy_last_modified(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_rewrite_location(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_rewrite_refresh(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_copy_allow_ranges(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); #if (NGX_HTTP_GZIP) static ngx_int_t ngx_http_upstream_copy_content_encoding(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); #endif static ngx_int_t ngx_http_upstream_add_variables(ngx_conf_t *cf); static ngx_int_t ngx_http_upstream_addr_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data); static ngx_int_t ngx_http_upstream_status_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data); static ngx_int_t ngx_http_upstream_response_time_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data); static ngx_int_t ngx_http_upstream_response_length_variable( ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data); static char *ngx_http_upstream(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy); static char *ngx_http_upstream_server(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); static void *ngx_http_upstream_create_main_conf(ngx_conf_t *cf); static char *ngx_http_upstream_init_main_conf(ngx_conf_t *cf, void *conf); #if (NGX_HTTP_SSL) static void ngx_http_upstream_ssl_init_connection(ngx_http_request_t *, ngx_http_upstream_t *u, ngx_connection_t *c); static void ngx_http_upstream_ssl_handshake(ngx_connection_t *c); #endif ngx_http_upstream_header_t ngx_http_upstream_headers_in[] = { { ngx_string("Status"), ngx_http_upstream_process_header_line, offsetof(ngx_http_upstream_headers_in_t, status), ngx_http_upstream_copy_header_line, 0, 0 }, { ngx_string("Content-Type"), ngx_http_upstream_process_header_line, offsetof(ngx_http_upstream_headers_in_t, content_type), ngx_http_upstream_copy_content_type, 0, 1 }, { ngx_string("Content-Length"), ngx_http_upstream_process_content_length, offsetof(ngx_http_upstream_headers_in_t, content_length), ngx_http_upstream_ignore_header_line, 0, 0 }, { ngx_string("Date"), ngx_http_upstream_process_header_line, offsetof(ngx_http_upstream_headers_in_t, date), ngx_http_upstream_copy_header_line, offsetof(ngx_http_headers_out_t, date), 0 }, { ngx_string("Last-Modified"), ngx_http_upstream_process_header_line, offsetof(ngx_http_upstream_headers_in_t, last_modified), ngx_http_upstream_copy_last_modified, 0, 0 }, { ngx_string("ETag"), ngx_http_upstream_process_header_line, offsetof(ngx_http_upstream_headers_in_t, etag), ngx_http_upstream_copy_header_line, offsetof(ngx_http_headers_out_t, etag), 0 }, { ngx_string("Server"), ngx_http_upstream_process_header_line, offsetof(ngx_http_upstream_headers_in_t, server), ngx_http_upstream_copy_header_line, offsetof(ngx_http_headers_out_t, server), 0 }, { ngx_string("WWW-Authenticate"), ngx_http_upstream_process_header_line, offsetof(ngx_http_upstream_headers_in_t, www_authenticate), ngx_http_upstream_copy_header_line, 0, 0 }, { ngx_string("Location"), ngx_http_upstream_process_header_line, offsetof(ngx_http_upstream_headers_in_t, location), ngx_http_upstream_rewrite_location, 0, 0 }, { ngx_string("Refresh"), ngx_http_upstream_ignore_header_line, 0, ngx_http_upstream_rewrite_refresh, 0, 0 }, { ngx_string("Set-Cookie"), ngx_http_upstream_process_set_cookie, 0, ngx_http_upstream_copy_header_line, 0, 1 }, { ngx_string("Content-Disposition"), ngx_http_upstream_ignore_header_line, 0, ngx_http_upstream_copy_header_line, 0, 1 }, { ngx_string("Cache-Control"), ngx_http_upstream_process_cache_control, 0, ngx_http_upstream_copy_multi_header_lines, offsetof(ngx_http_headers_out_t, cache_control), 1 }, { ngx_string("Expires"), ngx_http_upstream_process_expires, 0, ngx_http_upstream_copy_header_line, offsetof(ngx_http_headers_out_t, expires), 1 }, { ngx_string("Accept-Ranges"), ngx_http_upstream_process_header_line, offsetof(ngx_http_upstream_headers_in_t, accept_ranges), ngx_http_upstream_copy_allow_ranges, offsetof(ngx_http_headers_out_t, accept_ranges), 1 }, { ngx_string("Connection"), ngx_http_upstream_process_connection, 0, ngx_http_upstream_ignore_header_line, 0, 0 }, { ngx_string("Keep-Alive"), ngx_http_upstream_ignore_header_line, 0, ngx_http_upstream_ignore_header_line, 0, 0 }, { ngx_string("X-Powered-By"), ngx_http_upstream_ignore_header_line, 0, ngx_http_upstream_copy_header_line, 0, 0 }, { ngx_string("X-Accel-Expires"), ngx_http_upstream_process_accel_expires, 0, ngx_http_upstream_copy_header_line, 0, 0 }, { ngx_string("X-Accel-Redirect"), ngx_http_upstream_process_header_line, offsetof(ngx_http_upstream_headers_in_t, x_accel_redirect), ngx_http_upstream_copy_header_line, 0, 0 }, { ngx_string("X-Accel-Limit-Rate"), ngx_http_upstream_process_limit_rate, 0, ngx_http_upstream_copy_header_line, 0, 0 }, { ngx_string("X-Accel-Buffering"), ngx_http_upstream_process_buffering, 0, ngx_http_upstream_copy_header_line, 0, 0 }, { ngx_string("X-Accel-Charset"), ngx_http_upstream_process_charset, 0, ngx_http_upstream_copy_header_line, 0, 0 }, { ngx_string("Transfer-Encoding"), ngx_http_upstream_process_transfer_encoding, 0, ngx_http_upstream_ignore_header_line, 0, 0 }, #if (NGX_HTTP_GZIP) { ngx_string("Content-Encoding"), ngx_http_upstream_process_header_line, offsetof(ngx_http_upstream_headers_in_t, content_encoding), ngx_http_upstream_copy_content_encoding, 0, 0 }, #endif { ngx_null_string, NULL, 0, NULL, 0, 0 } }; static ngx_command_t ngx_http_upstream_commands[] = { { ngx_string("upstream"), NGX_HTTP_MAIN_CONF|NGX_CONF_BLOCK|NGX_CONF_TAKE1, ngx_http_upstream, 0, 0, NULL }, { ngx_string("server"), NGX_HTTP_UPS_CONF|NGX_CONF_1MORE, ngx_http_upstream_server, NGX_HTTP_SRV_CONF_OFFSET, 0, NULL }, ngx_null_command }; static ngx_http_module_t ngx_http_upstream_module_ctx = { ngx_http_upstream_add_variables, /* preconfiguration */ NULL, /* postconfiguration */ ngx_http_upstream_create_main_conf, /* create main configuration */ ngx_http_upstream_init_main_conf, /* init main configuration */ NULL, /* create server configuration */ NULL, /* merge server configuration */ NULL, /* create location configuration */ NULL /* merge location configuration */ }; ngx_module_t ngx_http_upstream_module = { NGX_MODULE_V1, &ngx_http_upstream_module_ctx, /* module context */ ngx_http_upstream_commands, /* module directives */ NGX_HTTP_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static ngx_http_variable_t ngx_http_upstream_vars[] = { { ngx_string("upstream_addr"), NULL, ngx_http_upstream_addr_variable, 0, NGX_HTTP_VAR_NOCACHEABLE, 0 }, { ngx_string("upstream_status"), NULL, ngx_http_upstream_status_variable, 0, NGX_HTTP_VAR_NOCACHEABLE, 0 }, { ngx_string("upstream_response_time"), NULL, ngx_http_upstream_response_time_variable, 0, NGX_HTTP_VAR_NOCACHEABLE, 0 }, { ngx_string("upstream_response_length"), NULL, ngx_http_upstream_response_length_variable, 0, NGX_HTTP_VAR_NOCACHEABLE, 0 }, #if (NGX_HTTP_CACHE) { ngx_string("upstream_cache_status"), NULL, ngx_http_upstream_cache_status, 0, NGX_HTTP_VAR_NOCACHEABLE, 0 }, #endif { ngx_null_string, NULL, NULL, 0, 0, 0 } }; static ngx_http_upstream_next_t ngx_http_upstream_next_errors[] = { { 500, NGX_HTTP_UPSTREAM_FT_HTTP_500 }, { 502, NGX_HTTP_UPSTREAM_FT_HTTP_502 }, { 503, NGX_HTTP_UPSTREAM_FT_HTTP_503 }, { 504, NGX_HTTP_UPSTREAM_FT_HTTP_504 }, { 404, NGX_HTTP_UPSTREAM_FT_HTTP_404 }, { 0, 0 } }; ngx_conf_bitmask_t ngx_http_upstream_cache_method_mask[] = { { ngx_string("GET"), NGX_HTTP_GET}, { ngx_string("HEAD"), NGX_HTTP_HEAD }, { ngx_string("POST"), NGX_HTTP_POST }, { ngx_null_string, 0 } }; ngx_conf_bitmask_t ngx_http_upstream_ignore_headers_masks[] = { { ngx_string("X-Accel-Redirect"), NGX_HTTP_UPSTREAM_IGN_XA_REDIRECT }, { ngx_string("X-Accel-Expires"), NGX_HTTP_UPSTREAM_IGN_XA_EXPIRES }, { ngx_string("Expires"), NGX_HTTP_UPSTREAM_IGN_EXPIRES }, { ngx_string("Cache-Control"), NGX_HTTP_UPSTREAM_IGN_CACHE_CONTROL }, { ngx_string("Set-Cookie"), NGX_HTTP_UPSTREAM_IGN_SET_COOKIE }, { ngx_null_string, 0 } }; ngx_int_t ngx_http_upstream_create(ngx_http_request_t *r) { ngx_http_upstream_t *u; u = r->upstream; if (u && u->cleanup) { r->main->count++; ngx_http_upstream_cleanup(r); } u = ngx_pcalloc(r->pool, sizeof(ngx_http_upstream_t)); if (u == NULL) { return NGX_ERROR; } r->upstream = u; u->peer.log = r->connection->log; u->peer.log_error = NGX_ERROR_ERR; #if (NGX_THREADS) u->peer.lock = &r->connection->lock; #endif #if (NGX_HTTP_CACHE) r->cache = NULL; #endif u->headers_in.content_length_n = -1; return NGX_OK; } void ngx_http_upstream_init(ngx_http_request_t *r) { ngx_connection_t *c; c = r->connection; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "http init upstream, client timer: %d", c->read->timer_set); if (c->read->timer_set) { ngx_del_timer(c->read); } if (ngx_event_flags & NGX_USE_CLEAR_EVENT) { if (!c->write->active) { if (ngx_add_event(c->write, NGX_WRITE_EVENT, NGX_CLEAR_EVENT) == NGX_ERROR) { ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } } } ngx_http_upstream_init_request(r); } static void ngx_http_upstream_init_request(ngx_http_request_t *r) { ngx_str_t *host; ngx_uint_t i; ngx_resolver_ctx_t *ctx, temp; ngx_http_cleanup_t *cln; ngx_http_upstream_t *u; ngx_http_core_loc_conf_t *clcf; ngx_http_upstream_srv_conf_t *uscf, **uscfp; ngx_http_upstream_main_conf_t *umcf; if (r->aio) { return; } u = r->upstream; #if (NGX_HTTP_CACHE) if (u->conf->cache) { ngx_int_t rc; rc = ngx_http_upstream_cache(r, u); if (rc == NGX_BUSY) { r->write_event_handler = ngx_http_upstream_init_request; return; } r->write_event_handler = ngx_http_request_empty_handler; if (rc == NGX_DONE) { return; } if (rc != NGX_DECLINED) { ngx_http_finalize_request(r, rc); return; } } #endif u->store = (u->conf->store || u->conf->store_lengths); if (!u->store && !r->post_action && !u->conf->ignore_client_abort) { r->read_event_handler = ngx_http_upstream_rd_check_broken_connection; r->write_event_handler = ngx_http_upstream_wr_check_broken_connection; } if (r->request_body) { u->request_bufs = r->request_body->bufs; } if (u->create_request(r) != NGX_OK) { ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } u->peer.local = u->conf->local; clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); u->output.alignment = clcf->directio_alignment; u->output.pool = r->pool; u->output.bufs.num = 1; u->output.bufs.size = clcf->client_body_buffer_size; u->output.output_filter = ngx_chain_writer; u->output.filter_ctx = &u->writer; u->writer.pool = r->pool; if (r->upstream_states == NULL) { r->upstream_states = ngx_array_create(r->pool, 1, sizeof(ngx_http_upstream_state_t)); if (r->upstream_states == NULL) { ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } } else { u->state = ngx_array_push(r->upstream_states); if (u->state == NULL) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } ngx_memzero(u->state, sizeof(ngx_http_upstream_state_t)); } cln = ngx_http_cleanup_add(r, 0); if (cln == NULL) { ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } cln->handler = ngx_http_upstream_cleanup; cln->data = r; u->cleanup = &cln->handler; if (u->resolved == NULL) { uscf = u->conf->upstream; } else { if (u->resolved->sockaddr) { if (ngx_http_upstream_create_round_robin_peer(r, u->resolved) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } ngx_http_upstream_connect(r, u); return; } host = &u->resolved->host; umcf = ngx_http_get_module_main_conf(r, ngx_http_upstream_module); uscfp = umcf->upstreams.elts; for (i = 0; i < umcf->upstreams.nelts; i++) { uscf = uscfp[i]; if (uscf->host.len == host->len && ((uscf->port == 0 && u->resolved->no_port) || uscf->port == u->resolved->port) && ngx_memcmp(uscf->host.data, host->data, host->len) == 0) { goto found; } } if (u->resolved->port == 0) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "no port in upstream \"%V\"", host); ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } temp.name = *host; ctx = ngx_resolve_start(clcf->resolver, &temp); if (ctx == NULL) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } if (ctx == NGX_NO_RESOLVER) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "no resolver defined to resolve %V", host); ngx_http_upstream_finalize_request(r, u, NGX_HTTP_BAD_GATEWAY); return; } ctx->name = *host; ctx->type = NGX_RESOLVE_A; ctx->handler = ngx_http_upstream_resolve_handler; ctx->data = r; ctx->timeout = clcf->resolver_timeout; u->resolved->ctx = ctx; if (ngx_resolve_name(ctx) != NGX_OK) { u->resolved->ctx = NULL; ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } return; } found: if (uscf->peer.init(r, uscf) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } ngx_http_upstream_connect(r, u); } #if (NGX_HTTP_CACHE) static ngx_int_t ngx_http_upstream_cache(ngx_http_request_t *r, ngx_http_upstream_t *u) { ngx_int_t rc; ngx_http_cache_t *c; c = r->cache; if (c == NULL) { if (!(r->method & u->conf->cache_methods)) { return NGX_DECLINED; } if (r->method & NGX_HTTP_HEAD) { u->method = ngx_http_core_get_method; } if (ngx_http_file_cache_new(r) != NGX_OK) { return NGX_ERROR; } if (u->create_key(r) != NGX_OK) { return NGX_ERROR; } /* TODO: add keys */ ngx_http_file_cache_create_key(r); if (r->cache->header_start + 256 >= u->conf->buffer_size) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "%V_buffer_size %uz is not enough for cache key, " "it should increased at least to %uz", &u->conf->module, u->conf->buffer_size, ngx_align(r->cache->header_start + 256, 1024)); r->cache = NULL; return NGX_DECLINED; } switch (ngx_http_test_predicates(r, u->conf->cache_bypass)) { case NGX_ERROR: return NGX_ERROR; case NGX_DECLINED: u->cache_status = NGX_HTTP_CACHE_BYPASS; return NGX_DECLINED; default: /* NGX_OK */ break; } u->cacheable = 1; c = r->cache; c->min_uses = u->conf->cache_min_uses; c->body_start = u->conf->buffer_size; c->file_cache = u->conf->cache->data; u->cache_status = NGX_HTTP_CACHE_MISS; } rc = ngx_http_file_cache_open(r); ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http upstream cache: %i", rc); switch (rc) { case NGX_HTTP_CACHE_UPDATING: if (u->conf->cache_use_stale & NGX_HTTP_UPSTREAM_FT_UPDATING) { u->cache_status = rc; rc = NGX_OK; } else { rc = NGX_HTTP_CACHE_STALE; } break; case NGX_OK: u->cache_status = NGX_HTTP_CACHE_HIT; } switch (rc) { case NGX_OK: rc = ngx_http_upstream_cache_send(r, u); if (rc != NGX_HTTP_UPSTREAM_INVALID_HEADER) { return rc; } break; case NGX_HTTP_CACHE_STALE: c->valid_sec = 0; u->buffer.start = NULL; u->cache_status = NGX_HTTP_CACHE_EXPIRED; break; case NGX_DECLINED: if ((size_t) (u->buffer.end - u->buffer.start) < u->conf->buffer_size) { u->buffer.start = NULL; } else { u->buffer.pos = u->buffer.start + c->header_start; u->buffer.last = u->buffer.pos; } break; case NGX_HTTP_CACHE_SCARCE: u->cacheable = 0; break; case NGX_AGAIN: return NGX_BUSY; case NGX_ERROR: return NGX_ERROR; default: /* cached NGX_HTTP_BAD_GATEWAY, NGX_HTTP_GATEWAY_TIME_OUT, etc. */ u->cache_status = NGX_HTTP_CACHE_HIT; return rc; } r->cached = 0; return NGX_DECLINED; } static ngx_int_t ngx_http_upstream_cache_send(ngx_http_request_t *r, ngx_http_upstream_t *u) { ngx_int_t rc; ngx_http_cache_t *c; r->cached = 1; c = r->cache; if (c->header_start == c->body_start) { r->http_version = NGX_HTTP_VERSION_9; return ngx_http_cache_send(r); } /* TODO: cache stack */ u->buffer = *c->buf; u->buffer.pos += c->header_start; ngx_memzero(&u->headers_in, sizeof(ngx_http_upstream_headers_in_t)); u->headers_in.content_length_n = -1; if (ngx_list_init(&u->headers_in.headers, r->pool, 8, sizeof(ngx_table_elt_t)) != NGX_OK) { return NGX_ERROR; } rc = u->process_header(r); if (rc == NGX_OK) { if (ngx_http_upstream_process_headers(r, u) != NGX_OK) { return NGX_DONE; } return ngx_http_cache_send(r); } if (rc == NGX_ERROR) { return NGX_ERROR; } /* rc == NGX_HTTP_UPSTREAM_INVALID_HEADER */ /* TODO: delete file */ return rc; } #endif static void ngx_http_upstream_resolve_handler(ngx_resolver_ctx_t *ctx) { ngx_http_request_t *r; ngx_http_upstream_t *u; ngx_http_upstream_resolved_t *ur; r = ctx->data; u = r->upstream; ur = u->resolved; if (ctx->state) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "%V could not be resolved (%i: %s)", &ctx->name, ctx->state, ngx_resolver_strerror(ctx->state)); ngx_http_upstream_finalize_request(r, u, NGX_HTTP_BAD_GATEWAY); return; } ur->naddrs = ctx->naddrs; ur->addrs = ctx->addrs; #if (NGX_DEBUG) { in_addr_t addr; ngx_uint_t i; for (i = 0; i < ctx->naddrs; i++) { addr = ntohl(ur->addrs[i]); ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "name was resolved to %ud.%ud.%ud.%ud", (addr >> 24) & 0xff, (addr >> 16) & 0xff, (addr >> 8) & 0xff, addr & 0xff); } } #endif if (ngx_http_upstream_create_round_robin_peer(r, ur) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } ngx_resolve_name_done(ctx); ur->ctx = NULL; ngx_http_upstream_connect(r, u); } static void ngx_http_upstream_handler(ngx_event_t *ev) { ngx_connection_t *c; ngx_http_request_t *r; ngx_http_log_ctx_t *ctx; ngx_http_upstream_t *u; c = ev->data; r = c->data; u = r->upstream; c = r->connection; ctx = c->log->data; ctx->current_request = r; ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0, "http upstream request: \"%V?%V\"", &r->uri, &r->args); if (ev->write) { u->write_event_handler(r, u); } else { u->read_event_handler(r, u); } ngx_http_run_posted_requests(c); } static void ngx_http_upstream_rd_check_broken_connection(ngx_http_request_t *r) { ngx_http_upstream_check_broken_connection(r, r->connection->read); } static void ngx_http_upstream_wr_check_broken_connection(ngx_http_request_t *r) { ngx_http_upstream_check_broken_connection(r, r->connection->write); } static void ngx_http_upstream_check_broken_connection(ngx_http_request_t *r, ngx_event_t *ev) { int n; char buf[1]; ngx_err_t err; ngx_int_t event; ngx_connection_t *c; ngx_http_upstream_t *u; ngx_log_debug2(NGX_LOG_DEBUG_HTTP, ev->log, 0, "http upstream check client, write event:%d, \"%V\"", ev->write, &r->uri); c = r->connection; u = r->upstream; if (c->error) { if ((ngx_event_flags & NGX_USE_LEVEL_EVENT) && ev->active) { event = ev->write ? NGX_WRITE_EVENT : NGX_READ_EVENT; if (ngx_del_event(ev, event, 0) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } } if (!u->cacheable) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_CLIENT_CLOSED_REQUEST); } return; } #if (NGX_HAVE_KQUEUE) if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { if (!ev->pending_eof) { return; } ev->eof = 1; c->error = 1; if (ev->kq_errno) { ev->error = 1; } if (!u->cacheable && u->peer.connection) { ngx_log_error(NGX_LOG_INFO, ev->log, ev->kq_errno, "kevent() reported that client closed prematurely " "connection, so upstream connection is closed too"); ngx_http_upstream_finalize_request(r, u, NGX_HTTP_CLIENT_CLOSED_REQUEST); return; } ngx_log_error(NGX_LOG_INFO, ev->log, ev->kq_errno, "kevent() reported that client closed " "prematurely connection"); if (u->peer.connection == NULL) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_CLIENT_CLOSED_REQUEST); } return; } #endif n = recv(c->fd, buf, 1, MSG_PEEK); err = ngx_socket_errno; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ev->log, err, "http upstream recv(): %d", n); if (ev->write && (n >= 0 || err == NGX_EAGAIN)) { return; } if ((ngx_event_flags & NGX_USE_LEVEL_EVENT) && ev->active) { event = ev->write ? NGX_WRITE_EVENT : NGX_READ_EVENT; if (ngx_del_event(ev, event, 0) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } } if (n > 0) { return; } if (n == -1) { if (err == NGX_EAGAIN) { return; } ev->error = 1; } else { /* n == 0 */ err = 0; } ev->eof = 1; c->error = 1; if (!u->cacheable && u->peer.connection) { ngx_log_error(NGX_LOG_INFO, ev->log, err, "client closed prematurely connection, " "so upstream connection is closed too"); ngx_http_upstream_finalize_request(r, u, NGX_HTTP_CLIENT_CLOSED_REQUEST); return; } ngx_log_error(NGX_LOG_INFO, ev->log, err, "client closed prematurely connection"); if (u->peer.connection == NULL) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_CLIENT_CLOSED_REQUEST); } } static void ngx_http_upstream_connect(ngx_http_request_t *r, ngx_http_upstream_t *u) { ngx_int_t rc; ngx_time_t *tp; ngx_connection_t *c; r->connection->log->action = "connecting to upstream"; r->connection->single_connection = 0; if (u->state && u->state->response_sec) { tp = ngx_timeofday(); u->state->response_sec = tp->sec - u->state->response_sec; u->state->response_msec = tp->msec - u->state->response_msec; } u->state = ngx_array_push(r->upstream_states); if (u->state == NULL) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } ngx_memzero(u->state, sizeof(ngx_http_upstream_state_t)); tp = ngx_timeofday(); u->state->response_sec = tp->sec; u->state->response_msec = tp->msec; rc = ngx_event_connect_peer(&u->peer); ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http upstream connect: %i", rc); if (rc == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } u->state->peer = u->peer.name; if (rc == NGX_BUSY) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "no live upstreams"); ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_NOLIVE); return; } if (rc == NGX_DECLINED) { ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR); return; } /* rc == NGX_OK || rc == NGX_AGAIN */ c = u->peer.connection; c->data = r; c->write->handler = ngx_http_upstream_handler; c->read->handler = ngx_http_upstream_handler; u->write_event_handler = ngx_http_upstream_send_request_handler; u->read_event_handler = ngx_http_upstream_process_header; c->sendfile &= r->connection->sendfile; u->output.sendfile = c->sendfile; if (c->pool == NULL) { /* we need separate pool here to be able to cache SSL connections */ c->pool = ngx_create_pool(128, r->connection->log); if (c->pool == NULL) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } } c->log = r->connection->log; c->pool->log = c->log; c->read->log = c->log; c->write->log = c->log; /* init or reinit the ngx_output_chain() and ngx_chain_writer() contexts */ u->writer.out = NULL; u->writer.last = &u->writer.out; u->writer.connection = c; u->writer.limit = 0; if (u->request_sent) { if (ngx_http_upstream_reinit(r, u) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } } if (r->request_body && r->request_body->buf && r->request_body->temp_file && r == r->main) { /* * the r->request_body->buf can be reused for one request only, * the subrequests should allocate their own temporay bufs */ u->output.free = ngx_alloc_chain_link(r->pool); if (u->output.free == NULL) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } u->output.free->buf = r->request_body->buf; u->output.free->next = NULL; u->output.allocated = 1; r->request_body->buf->pos = r->request_body->buf->start; r->request_body->buf->last = r->request_body->buf->start; r->request_body->buf->tag = u->output.tag; } u->request_sent = 0; if (rc == NGX_AGAIN) { ngx_add_timer(c->write, u->conf->connect_timeout); return; } #if (NGX_HTTP_SSL) if (u->ssl && c->ssl == NULL) { ngx_http_upstream_ssl_init_connection(r, u, c); return; } #endif ngx_http_upstream_send_request(r, u); } #if (NGX_HTTP_SSL) static void ngx_http_upstream_ssl_init_connection(ngx_http_request_t *r, ngx_http_upstream_t *u, ngx_connection_t *c) { ngx_int_t rc; if (ngx_ssl_create_connection(u->conf->ssl, c, NGX_SSL_BUFFER|NGX_SSL_CLIENT) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } c->sendfile = 0; u->output.sendfile = 0; if (u->conf->ssl_session_reuse) { if (u->peer.set_session(&u->peer, u->peer.data) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } } r->connection->log->action = "SSL handshaking to upstream"; rc = ngx_ssl_handshake(c); if (rc == NGX_AGAIN) { c->ssl->handler = ngx_http_upstream_ssl_handshake; return; } ngx_http_upstream_ssl_handshake(c); } static void ngx_http_upstream_ssl_handshake(ngx_connection_t *c) { ngx_http_request_t *r; ngx_http_upstream_t *u; r = c->data; u = r->upstream; if (c->ssl->handshaked) { if (u->conf->ssl_session_reuse) { u->peer.save_session(&u->peer, u->peer.data); } c->write->handler = ngx_http_upstream_handler; c->read->handler = ngx_http_upstream_handler; ngx_http_upstream_send_request(r, u); return; } ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR); } #endif static ngx_int_t ngx_http_upstream_reinit(ngx_http_request_t *r, ngx_http_upstream_t *u) { ngx_chain_t *cl; if (u->reinit_request(r) != NGX_OK) { return NGX_ERROR; } u->keepalive = 0; ngx_memzero(&u->headers_in, sizeof(ngx_http_upstream_headers_in_t)); u->headers_in.content_length_n = -1; if (ngx_list_init(&u->headers_in.headers, r->pool, 8, sizeof(ngx_table_elt_t)) != NGX_OK) { return NGX_ERROR; } /* reinit the request chain */ for (cl = u->request_bufs; cl; cl = cl->next) { cl->buf->pos = cl->buf->start; cl->buf->file_pos = 0; } /* reinit the subrequest's ngx_output_chain() context */ if (r->request_body && r->request_body->temp_file && r != r->main && u->output.buf) { u->output.free = ngx_alloc_chain_link(r->pool); if (u->output.free == NULL) { return NGX_ERROR; } u->output.free->buf = u->output.buf; u->output.free->next = NULL; u->output.buf->pos = u->output.buf->start; u->output.buf->last = u->output.buf->start; } u->output.buf = NULL; u->output.in = NULL; u->output.busy = NULL; /* reinit u->buffer */ u->buffer.pos = u->buffer.start; #if (NGX_HTTP_CACHE) if (r->cache) { u->buffer.pos += r->cache->header_start; } #endif u->buffer.last = u->buffer.pos; return NGX_OK; } static void ngx_http_upstream_send_request(ngx_http_request_t *r, ngx_http_upstream_t *u) { ngx_int_t rc; ngx_connection_t *c; c = u->peer.connection; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http upstream send request"); if (!u->request_sent && ngx_http_upstream_test_connect(c) != NGX_OK) { ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR); return; } c->log->action = "sending request to upstream"; rc = ngx_output_chain(&u->output, u->request_sent ? NULL : u->request_bufs); u->request_sent = 1; if (rc == NGX_ERROR) { ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR); return; } if (c->write->timer_set) { ngx_del_timer(c->write); } if (rc == NGX_AGAIN) { ngx_add_timer(c->write, u->conf->send_timeout); if (ngx_handle_write_event(c->write, u->conf->send_lowat) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } return; } /* rc == NGX_OK */ if (c->tcp_nopush == NGX_TCP_NOPUSH_SET) { if (ngx_tcp_push(c->fd) == NGX_ERROR) { ngx_log_error(NGX_LOG_CRIT, c->log, ngx_socket_errno, ngx_tcp_push_n " failed"); ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } c->tcp_nopush = NGX_TCP_NOPUSH_UNSET; } ngx_add_timer(c->read, u->conf->read_timeout); #if 1 if (c->read->ready) { /* post aio operation */ /* * TODO comment * although we can post aio operation just in the end * of ngx_http_upstream_connect() CHECK IT !!! * it's better to do here because we postpone header buffer allocation */ ngx_http_upstream_process_header(r, u); return; } #endif u->write_event_handler = ngx_http_upstream_dummy_handler; if (ngx_handle_write_event(c->write, 0) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } } static void ngx_http_upstream_send_request_handler(ngx_http_request_t *r, ngx_http_upstream_t *u) { ngx_connection_t *c; c = u->peer.connection; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http upstream send request handler"); if (c->write->timedout) { ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_TIMEOUT); return; } #if (NGX_HTTP_SSL) if (u->ssl && c->ssl == NULL) { ngx_http_upstream_ssl_init_connection(r, u, c); return; } #endif if (u->header_sent) { u->write_event_handler = ngx_http_upstream_dummy_handler; (void) ngx_handle_write_event(c->write, 0); return; } ngx_http_upstream_send_request(r, u); } static void ngx_http_upstream_process_header(ngx_http_request_t *r, ngx_http_upstream_t *u) { ssize_t n; ngx_int_t rc; ngx_connection_t *c; c = u->peer.connection; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http upstream process header"); c->log->action = "reading response header from upstream"; if (c->read->timedout) { ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_TIMEOUT); return; } if (!u->request_sent && ngx_http_upstream_test_connect(c) != NGX_OK) { ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR); return; } if (u->buffer.start == NULL) { u->buffer.start = ngx_palloc(r->pool, u->conf->buffer_size); if (u->buffer.start == NULL) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } u->buffer.pos = u->buffer.start; u->buffer.last = u->buffer.start; u->buffer.end = u->buffer.start + u->conf->buffer_size; u->buffer.temporary = 1; u->buffer.tag = u->output.tag; if (ngx_list_init(&u->headers_in.headers, r->pool, 8, sizeof(ngx_table_elt_t)) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } #if (NGX_HTTP_CACHE) if (r->cache) { u->buffer.pos += r->cache->header_start; u->buffer.last = u->buffer.pos; } #endif } for ( ;; ) { n = c->recv(c, u->buffer.last, u->buffer.end - u->buffer.last); if (n == NGX_AGAIN) { #if 0 ngx_add_timer(rev, u->read_timeout); #endif if (ngx_handle_read_event(c->read, 0) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } return; } if (n == 0) { ngx_log_error(NGX_LOG_ERR, c->log, 0, "upstream prematurely closed connection"); } if (n == NGX_ERROR || n == 0) { ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR); return; } u->buffer.last += n; #if 0 u->valid_header_in = 0; u->peer.cached = 0; #endif rc = u->process_header(r); if (rc == NGX_AGAIN) { if (u->buffer.pos == u->buffer.end) { ngx_log_error(NGX_LOG_ERR, c->log, 0, "upstream sent too big header"); ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_INVALID_HEADER); return; } continue; } break; } if (rc == NGX_HTTP_UPSTREAM_INVALID_HEADER) { ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_INVALID_HEADER); return; } if (rc == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } /* rc == NGX_OK */ if (u->headers_in.status_n > NGX_HTTP_SPECIAL_RESPONSE) { if (r->subrequest_in_memory) { u->buffer.last = u->buffer.pos; } if (ngx_http_upstream_test_next(r, u) == NGX_OK) { return; } if (ngx_http_upstream_intercept_errors(r, u) == NGX_OK) { return; } } if (ngx_http_upstream_process_headers(r, u) != NGX_OK) { return; } if (!r->subrequest_in_memory) { ngx_http_upstream_send_response(r, u); return; } /* subrequest content in memory */ if (u->input_filter == NULL) { u->input_filter_init = ngx_http_upstream_non_buffered_filter_init; u->input_filter = ngx_http_upstream_non_buffered_filter; u->input_filter_ctx = r; } if (u->input_filter_init(u->input_filter_ctx) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } n = u->buffer.last - u->buffer.pos; if (n) { u->buffer.last -= n; u->state->response_length += n; if (u->input_filter(u->input_filter_ctx, n) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, NGX_ERROR); return; } if (u->length == 0) { ngx_http_upstream_finalize_request(r, u, 0); return; } } u->read_event_handler = ngx_http_upstream_process_body_in_memory; ngx_http_upstream_process_body_in_memory(r, u); } static ngx_int_t ngx_http_upstream_test_next(ngx_http_request_t *r, ngx_http_upstream_t *u) { ngx_uint_t status; ngx_http_upstream_next_t *un; status = u->headers_in.status_n; for (un = ngx_http_upstream_next_errors; un->status; un++) { if (status != un->status) { continue; } if (u->peer.tries > 1 && (u->conf->next_upstream & un->mask)) { ngx_http_upstream_next(r, u, un->mask); return NGX_OK; } #if (NGX_HTTP_CACHE) if (u->cache_status == NGX_HTTP_CACHE_EXPIRED && (u->conf->cache_use_stale & un->mask)) { ngx_int_t rc; rc = u->reinit_request(r); if (rc == NGX_OK) { u->cache_status = NGX_HTTP_CACHE_STALE; rc = ngx_http_upstream_cache_send(r, u); } ngx_http_upstream_finalize_request(r, u, rc); return NGX_OK; } #endif } return NGX_DECLINED; } static ngx_int_t ngx_http_upstream_intercept_errors(ngx_http_request_t *r, ngx_http_upstream_t *u) { ngx_int_t status; ngx_uint_t i; ngx_table_elt_t *h; ngx_http_err_page_t *err_page; ngx_http_core_loc_conf_t *clcf; status = u->headers_in.status_n; if (status == NGX_HTTP_NOT_FOUND && u->conf->intercept_404) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_NOT_FOUND); return NGX_OK; } if (!u->conf->intercept_errors) { return NGX_DECLINED; } clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); if (clcf->error_pages == NULL) { return NGX_DECLINED; } err_page = clcf->error_pages->elts; for (i = 0; i < clcf->error_pages->nelts; i++) { if (err_page[i].status == status) { if (status == NGX_HTTP_UNAUTHORIZED && u->headers_in.www_authenticate) { h = ngx_list_push(&r->headers_out.headers); if (h == NULL) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return NGX_OK; } *h = *u->headers_in.www_authenticate; r->headers_out.www_authenticate = h; } #if (NGX_HTTP_CACHE) if (r->cache) { time_t valid; valid = ngx_http_file_cache_valid(u->conf->cache_valid, status); if (valid) { r->cache->valid_sec = ngx_time() + valid; r->cache->error = status; } ngx_http_file_cache_free(r->cache, u->pipe->temp_file); } #endif ngx_http_upstream_finalize_request(r, u, status); return NGX_OK; } } return NGX_DECLINED; } static ngx_int_t ngx_http_upstream_test_connect(ngx_connection_t *c) { int err; socklen_t len; #if (NGX_HAVE_KQUEUE) if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { if (c->write->pending_eof) { c->log->action = "connecting to upstream"; (void) ngx_connection_error(c, c->write->kq_errno, "kevent() reported that connect() failed"); return NGX_ERROR; } } else #endif { err = 0; len = sizeof(int); /* * BSDs and Linux return 0 and set a pending error in err * Solaris returns -1 and sets errno */ if (getsockopt(c->fd, SOL_SOCKET, SO_ERROR, (void *) &err, &len) == -1) { err = ngx_errno; } if (err) { c->log->action = "connecting to upstream"; (void) ngx_connection_error(c, err, "connect() failed"); return NGX_ERROR; } } return NGX_OK; } static ngx_int_t ngx_http_upstream_process_headers(ngx_http_request_t *r, ngx_http_upstream_t *u) { ngx_str_t *uri, args; ngx_uint_t i, flags; ngx_list_part_t *part; ngx_table_elt_t *h; ngx_http_upstream_header_t *hh; ngx_http_upstream_main_conf_t *umcf; umcf = ngx_http_get_module_main_conf(r, ngx_http_upstream_module); if (u->headers_in.x_accel_redirect && !(u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_XA_REDIRECT)) { ngx_http_upstream_finalize_request(r, u, NGX_DECLINED); part = &u->headers_in.headers.part; h = part->elts; for (i = 0; /* void */; i++) { if (i >= part->nelts) { if (part->next == NULL) { break; } part = part->next; h = part->elts; i = 0; } hh = ngx_hash_find(&umcf->headers_in_hash, h[i].hash, h[i].lowcase_key, h[i].key.len); if (hh && hh->redirect) { if (hh->copy_handler(r, &h[i], hh->conf) != NGX_OK) { ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); return NGX_DONE; } } } uri = &u->headers_in.x_accel_redirect->value; ngx_str_null(&args); flags = NGX_HTTP_LOG_UNSAFE; if (ngx_http_parse_unsafe_uri(r, uri, &args, &flags) != NGX_OK) { ngx_http_finalize_request(r, NGX_HTTP_NOT_FOUND); return NGX_DONE; } if (r->method != NGX_HTTP_HEAD) { r->method = NGX_HTTP_GET; } r->valid_unparsed_uri = 0; ngx_http_internal_redirect(r, uri, &args); ngx_http_finalize_request(r, NGX_DONE); return NGX_DONE; } part = &u->headers_in.headers.part; h = part->elts; for (i = 0; /* void */; i++) { if (i >= part->nelts) { if (part->next == NULL) { break; } part = part->next; h = part->elts; i = 0; } if (ngx_hash_find(&u->conf->hide_headers_hash, h[i].hash, h[i].lowcase_key, h[i].key.len)) { continue; } hh = ngx_hash_find(&umcf->headers_in_hash, h[i].hash, h[i].lowcase_key, h[i].key.len); if (hh) { if (hh->copy_handler(r, &h[i], hh->conf) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return NGX_DONE; } continue; } if (ngx_http_upstream_copy_header_line(r, &h[i], 0) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return NGX_DONE; } } if (r->headers_out.server && r->headers_out.server->value.data == NULL) { r->headers_out.server->hash = 0; } if (r->headers_out.date && r->headers_out.date->value.data == NULL) { r->headers_out.date->hash = 0; } r->headers_out.status = u->headers_in.status_n; r->headers_out.status_line = u->headers_in.status_line; r->headers_out.content_length_n = u->headers_in.content_length_n; u->length = u->headers_in.content_length_n; return NGX_OK; } static void ngx_http_upstream_process_body_in_memory(ngx_http_request_t *r, ngx_http_upstream_t *u) { size_t size; ssize_t n; ngx_buf_t *b; ngx_event_t *rev; ngx_connection_t *c; c = u->peer.connection; rev = c->read; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http upstream process body on memory"); if (rev->timedout) { ngx_connection_error(c, NGX_ETIMEDOUT, "upstream timed out"); ngx_http_upstream_finalize_request(r, u, NGX_ETIMEDOUT); return; } b = &u->buffer; for ( ;; ) { size = b->end - b->last; if (size == 0) { ngx_log_error(NGX_LOG_ALERT, c->log, 0, "upstream buffer is too small to read response"); ngx_http_upstream_finalize_request(r, u, NGX_ERROR); return; } n = c->recv(c, b->last, size); if (n == NGX_AGAIN) { break; } if (n == 0 || n == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, n); return; } u->state->response_length += n; if (u->input_filter(u->input_filter_ctx, n) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, NGX_ERROR); return; } if (!rev->ready) { break; } } if (u->length == 0) { ngx_http_upstream_finalize_request(r, u, 0); return; } if (ngx_handle_read_event(rev, 0) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_ERROR); return; } if (rev->active) { ngx_add_timer(rev, u->conf->read_timeout); } else if (rev->timer_set) { ngx_del_timer(rev); } } static void ngx_http_upstream_send_response(ngx_http_request_t *r, ngx_http_upstream_t *u) { int tcp_nodelay; ssize_t n; ngx_int_t rc; ngx_event_pipe_t *p; ngx_connection_t *c; ngx_http_core_loc_conf_t *clcf; rc = ngx_http_send_header(r); if (rc == NGX_ERROR || rc > NGX_OK || r->post_action) { ngx_http_upstream_finalize_request(r, u, rc); return; } c = r->connection; if (r->header_only) { if (u->cacheable || u->store) { if (ngx_shutdown_socket(c->fd, NGX_WRITE_SHUTDOWN) == -1) { ngx_connection_error(c, ngx_socket_errno, ngx_shutdown_socket_n " failed"); } r->read_event_handler = ngx_http_request_empty_handler; r->write_event_handler = ngx_http_request_empty_handler; c->error = 1; } else { ngx_http_upstream_finalize_request(r, u, rc); return; } } u->header_sent = 1; if (r->request_body && r->request_body->temp_file) { ngx_pool_run_cleanup_file(r->pool, r->request_body->temp_file->file.fd); r->request_body->temp_file->file.fd = NGX_INVALID_FILE; } clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); if (!u->buffering) { if (u->input_filter == NULL) { u->input_filter_init = ngx_http_upstream_non_buffered_filter_init; u->input_filter = ngx_http_upstream_non_buffered_filter; u->input_filter_ctx = r; } u->read_event_handler = ngx_http_upstream_process_non_buffered_upstream; r->write_event_handler = ngx_http_upstream_process_non_buffered_downstream; r->limit_rate = 0; if (u->input_filter_init(u->input_filter_ctx) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, 0); return; } if (clcf->tcp_nodelay && c->tcp_nodelay == NGX_TCP_NODELAY_UNSET) { ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "tcp_nodelay"); tcp_nodelay = 1; if (setsockopt(c->fd, IPPROTO_TCP, TCP_NODELAY, (const void *) &tcp_nodelay, sizeof(int)) == -1) { ngx_connection_error(c, ngx_socket_errno, "setsockopt(TCP_NODELAY) failed"); ngx_http_upstream_finalize_request(r, u, 0); return; } c->tcp_nodelay = NGX_TCP_NODELAY_SET; } n = u->buffer.last - u->buffer.pos; if (n) { u->buffer.last = u->buffer.pos; u->state->response_length += n; if (u->input_filter(u->input_filter_ctx, n) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, 0); return; } ngx_http_upstream_process_non_buffered_downstream(r); } else { u->buffer.pos = u->buffer.start; u->buffer.last = u->buffer.start; if (ngx_http_send_special(r, NGX_HTTP_FLUSH) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, 0); return; } if (u->peer.connection->read->ready || u->length == 0) { ngx_http_upstream_process_non_buffered_upstream(r, u); } } return; } /* TODO: preallocate event_pipe bufs, look "Content-Length" */ #if (NGX_HTTP_CACHE) if (r->cache && r->cache->file.fd != NGX_INVALID_FILE) { ngx_pool_run_cleanup_file(r->pool, r->cache->file.fd); r->cache->file.fd = NGX_INVALID_FILE; } switch (ngx_http_test_predicates(r, u->conf->no_cache)) { case NGX_ERROR: ngx_http_upstream_finalize_request(r, u, 0); return; case NGX_DECLINED: u->cacheable = 0; break; default: /* NGX_OK */ if (u->cache_status == NGX_HTTP_CACHE_BYPASS) { r->cache->min_uses = u->conf->cache_min_uses; r->cache->body_start = u->conf->buffer_size; r->cache->file_cache = u->conf->cache->data; if (ngx_http_file_cache_create(r) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, 0); return; } u->cacheable = 1; } break; } if (u->cacheable) { time_t now, valid; now = ngx_time(); valid = r->cache->valid_sec; if (valid == 0) { valid = ngx_http_file_cache_valid(u->conf->cache_valid, u->headers_in.status_n); if (valid) { r->cache->valid_sec = now + valid; } } if (valid) { r->cache->last_modified = r->headers_out.last_modified_time; r->cache->date = now; r->cache->body_start = (u_short) (u->buffer.pos - u->buffer.start); ngx_http_file_cache_set_header(r, u->buffer.start); } else { u->cacheable = 0; r->headers_out.last_modified_time = -1; } } ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "http cacheable: %d", u->cacheable); if (u->cacheable == 0 && r->cache) { ngx_http_file_cache_free(r->cache, u->pipe->temp_file); } #endif p = u->pipe; p->output_filter = (ngx_event_pipe_output_filter_pt) ngx_http_output_filter; p->output_ctx = r; p->tag = u->output.tag; p->bufs = u->conf->bufs; p->busy_size = u->conf->busy_buffers_size; p->upstream = u->peer.connection; p->downstream = c; p->pool = r->pool; p->log = c->log; p->cacheable = u->cacheable || u->store; p->temp_file = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t)); if (p->temp_file == NULL) { ngx_http_upstream_finalize_request(r, u, 0); return; } p->temp_file->file.fd = NGX_INVALID_FILE; p->temp_file->file.log = c->log; p->temp_file->path = u->conf->temp_path; p->temp_file->pool = r->pool; if (p->cacheable) { p->temp_file->persistent = 1; } else { p->temp_file->log_level = NGX_LOG_WARN; p->temp_file->warn = "an upstream response is buffered " "to a temporary file"; } p->max_temp_file_size = u->conf->max_temp_file_size; p->temp_file_write_size = u->conf->temp_file_write_size; p->preread_bufs = ngx_alloc_chain_link(r->pool); if (p->preread_bufs == NULL) { ngx_http_upstream_finalize_request(r, u, 0); return; } p->preread_bufs->buf = &u->buffer; p->preread_bufs->next = NULL; u->buffer.recycled = 1; p->preread_size = u->buffer.last - u->buffer.pos; if (u->cacheable) { p->buf_to_file = ngx_calloc_buf(r->pool); if (p->buf_to_file == NULL) { ngx_http_upstream_finalize_request(r, u, 0); return; } p->buf_to_file->pos = u->buffer.start; p->buf_to_file->last = u->buffer.pos; p->buf_to_file->temporary = 1; } if (ngx_event_flags & NGX_USE_AIO_EVENT) { /* the posted aio operation may currupt a shadow buffer */ p->single_buf = 1; } /* TODO: p->free_bufs = 0 if use ngx_create_chain_of_bufs() */ p->free_bufs = 1; /* * event_pipe would do u->buffer.last += p->preread_size * as though these bytes were read */ u->buffer.last = u->buffer.pos; if (u->conf->cyclic_temp_file) { /* * we need to disable the use of sendfile() if we use cyclic temp file * because the writing a new data may interfere with sendfile() * that uses the same kernel file pages (at least on FreeBSD) */ p->cyclic_temp_file = 1; c->sendfile = 0; } else { p->cyclic_temp_file = 0; } p->read_timeout = u->conf->read_timeout; p->send_timeout = clcf->send_timeout; p->send_lowat = clcf->send_lowat; p->length = -1; if (u->input_filter_init && u->input_filter_init(p->input_ctx) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, 0); return; } u->read_event_handler = ngx_http_upstream_process_upstream; r->write_event_handler = ngx_http_upstream_process_downstream; ngx_http_upstream_process_upstream(r, u); } static void ngx_http_upstream_process_non_buffered_downstream(ngx_http_request_t *r) { ngx_event_t *wev; ngx_connection_t *c; ngx_http_upstream_t *u; c = r->connection; u = r->upstream; wev = c->write; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http upstream process non buffered downstream"); c->log->action = "sending to client"; if (wev->timedout) { c->timedout = 1; ngx_connection_error(c, NGX_ETIMEDOUT, "client timed out"); ngx_http_upstream_finalize_request(r, u, NGX_HTTP_REQUEST_TIME_OUT); return; } ngx_http_upstream_process_non_buffered_request(r, 1); } static void ngx_http_upstream_process_non_buffered_upstream(ngx_http_request_t *r, ngx_http_upstream_t *u) { ngx_connection_t *c; c = u->peer.connection; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http upstream process non buffered upstream"); c->log->action = "reading upstream"; if (c->read->timedout) { ngx_connection_error(c, NGX_ETIMEDOUT, "upstream timed out"); ngx_http_upstream_finalize_request(r, u, 0); return; } ngx_http_upstream_process_non_buffered_request(r, 0); } static void ngx_http_upstream_process_non_buffered_request(ngx_http_request_t *r, ngx_uint_t do_write) { size_t size; ssize_t n; ngx_buf_t *b; ngx_int_t rc; ngx_connection_t *downstream, *upstream; ngx_http_upstream_t *u; ngx_http_core_loc_conf_t *clcf; u = r->upstream; downstream = r->connection; upstream = u->peer.connection; b = &u->buffer; do_write = do_write || u->length == 0; for ( ;; ) { if (do_write) { if (u->out_bufs || u->busy_bufs) { rc = ngx_http_output_filter(r, u->out_bufs); if (rc == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, 0); return; } ngx_chain_update_chains(r->pool, &u->free_bufs, &u->busy_bufs, &u->out_bufs, u->output.tag); } if (u->busy_bufs == NULL) { if (u->length == 0 || upstream->read->eof || upstream->read->error) { ngx_http_upstream_finalize_request(r, u, 0); return; } b->pos = b->start; b->last = b->start; } } size = b->end - b->last; if (size && upstream->read->ready) { n = upstream->recv(upstream, b->last, size); if (n == NGX_AGAIN) { break; } if (n > 0) { u->state->response_length += n; if (u->input_filter(u->input_filter_ctx, n) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, 0); return; } } do_write = 1; continue; } break; } clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); if (downstream->data == r) { if (ngx_handle_write_event(downstream->write, clcf->send_lowat) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, 0); return; } } if (downstream->write->active && !downstream->write->ready) { ngx_add_timer(downstream->write, clcf->send_timeout); } else if (downstream->write->timer_set) { ngx_del_timer(downstream->write); } if (ngx_handle_read_event(upstream->read, 0) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, 0); return; } if (upstream->read->active && !upstream->read->ready) { ngx_add_timer(upstream->read, u->conf->read_timeout); } else if (upstream->read->timer_set) { ngx_del_timer(upstream->read); } } static ngx_int_t ngx_http_upstream_non_buffered_filter_init(void *data) { return NGX_OK; } static ngx_int_t ngx_http_upstream_non_buffered_filter(void *data, ssize_t bytes) { ngx_http_request_t *r = data; ngx_buf_t *b; ngx_chain_t *cl, **ll; ngx_http_upstream_t *u; u = r->upstream; for (cl = u->out_bufs, ll = &u->out_bufs; cl; cl = cl->next) { ll = &cl->next; } cl = ngx_chain_get_free_buf(r->pool, &u->free_bufs); if (cl == NULL) { return NGX_ERROR; } *ll = cl; cl->buf->flush = 1; cl->buf->memory = 1; b = &u->buffer; cl->buf->pos = b->last; b->last += bytes; cl->buf->last = b->last; cl->buf->tag = u->output.tag; if (u->length == -1) { return NGX_OK; } u->length -= bytes; return NGX_OK; } static void ngx_http_upstream_process_downstream(ngx_http_request_t *r) { ngx_event_t *wev; ngx_connection_t *c; ngx_event_pipe_t *p; ngx_http_upstream_t *u; c = r->connection; u = r->upstream; p = u->pipe; wev = c->write; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http upstream process downstream"); c->log->action = "sending to client"; if (wev->timedout) { if (wev->delayed) { wev->timedout = 0; wev->delayed = 0; if (!wev->ready) { ngx_add_timer(wev, p->send_timeout); if (ngx_handle_write_event(wev, p->send_lowat) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, 0); } return; } if (ngx_event_pipe(p, wev->write) == NGX_ABORT) { ngx_http_upstream_finalize_request(r, u, 0); return; } } else { p->downstream_error = 1; c->timedout = 1; ngx_connection_error(c, NGX_ETIMEDOUT, "client timed out"); } } else { if (wev->delayed) { ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http downstream delayed"); if (ngx_handle_write_event(wev, p->send_lowat) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, 0); } return; } if (ngx_event_pipe(p, 1) == NGX_ABORT) { ngx_http_upstream_finalize_request(r, u, 0); return; } } ngx_http_upstream_process_request(r); } static void ngx_http_upstream_process_upstream(ngx_http_request_t *r, ngx_http_upstream_t *u) { ngx_connection_t *c; c = u->peer.connection; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http upstream process upstream"); c->log->action = "reading upstream"; if (c->read->timedout) { u->pipe->upstream_error = 1; ngx_connection_error(c, NGX_ETIMEDOUT, "upstream timed out"); } else { if (ngx_event_pipe(u->pipe, 0) == NGX_ABORT) { ngx_http_upstream_finalize_request(r, u, 0); return; } } ngx_http_upstream_process_request(r); } static void ngx_http_upstream_process_request(ngx_http_request_t *r) { ngx_uint_t del; ngx_temp_file_t *tf; ngx_event_pipe_t *p; ngx_http_upstream_t *u; u = r->upstream; p = u->pipe; if (u->peer.connection) { if (u->store) { del = p->upstream_error; tf = u->pipe->temp_file; if (p->upstream_eof || p->upstream_done) { if (u->headers_in.status_n == NGX_HTTP_OK && (u->headers_in.content_length_n == -1 || (u->headers_in.content_length_n == tf->offset))) { ngx_http_upstream_store(r, u); } else { del = 1; } } if (del && tf->file.fd != NGX_INVALID_FILE) { if (ngx_delete_file(tf->file.name.data) == NGX_FILE_ERROR) { ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno, ngx_delete_file_n " \"%s\" failed", u->pipe->temp_file->file.name.data); } } } #if (NGX_HTTP_CACHE) if (u->cacheable) { if (p->upstream_done) { ngx_http_file_cache_update(r, u->pipe->temp_file); } else if (p->upstream_eof) { /* TODO: check length & update cache */ ngx_http_file_cache_update(r, u->pipe->temp_file); } else if (p->upstream_error) { ngx_http_file_cache_free(r->cache, u->pipe->temp_file); } } #endif if (p->upstream_done || p->upstream_eof || p->upstream_error) { ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http upstream exit: %p", p->out); #if 0 ngx_http_busy_unlock(u->conf->busy_lock, &u->busy_lock); #endif ngx_http_upstream_finalize_request(r, u, 0); return; } } if (p->downstream_error) { ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http upstream downstream error"); if (!u->cacheable && !u->store && u->peer.connection) { ngx_http_upstream_finalize_request(r, u, 0); } } } static void ngx_http_upstream_store(ngx_http_request_t *r, ngx_http_upstream_t *u) { size_t root; time_t lm; ngx_str_t path; ngx_temp_file_t *tf; ngx_ext_rename_file_t ext; tf = u->pipe->temp_file; if (tf->file.fd == NGX_INVALID_FILE) { /* create file for empty 200 response */ tf = ngx_pcalloc(r->pool, sizeof(ngx_temp_file_t)); if (tf == NULL) { return; } tf->file.fd = NGX_INVALID_FILE; tf->file.log = r->connection->log; tf->path = u->conf->temp_path; tf->pool = r->pool; tf->persistent = 1; if (ngx_create_temp_file(&tf->file, tf->path, tf->pool, tf->persistent, tf->clean, tf->access) != NGX_OK) { return; } u->pipe->temp_file = tf; } ext.access = u->conf->store_access; ext.path_access = u->conf->store_access; ext.time = -1; ext.create_path = 1; ext.delete_file = 1; ext.log = r->connection->log; if (u->headers_in.last_modified) { lm = ngx_http_parse_time(u->headers_in.last_modified->value.data, u->headers_in.last_modified->value.len); if (lm != NGX_ERROR) { ext.time = lm; ext.fd = tf->file.fd; } } if (u->conf->store_lengths == NULL) { ngx_http_map_uri_to_path(r, &path, &root, 0); } else { if (ngx_http_script_run(r, &path, u->conf->store_lengths->elts, 0, u->conf->store_values->elts) == NULL) { return; } } path.len--; ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "upstream stores \"%s\" to \"%s\"", tf->file.name.data, path.data); (void) ngx_ext_rename_file(&tf->file.name, &path, &ext); } static void ngx_http_upstream_dummy_handler(ngx_http_request_t *r, ngx_http_upstream_t *u) { ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http upstream dummy handler"); } static void ngx_http_upstream_next(ngx_http_request_t *r, ngx_http_upstream_t *u, ngx_uint_t ft_type) { ngx_uint_t status, state; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http next upstream, %xi", ft_type); #if 0 ngx_http_busy_unlock(u->conf->busy_lock, &u->busy_lock); #endif if (ft_type == NGX_HTTP_UPSTREAM_FT_HTTP_404) { state = NGX_PEER_NEXT; } else { state = NGX_PEER_FAILED; } if (ft_type != NGX_HTTP_UPSTREAM_FT_NOLIVE) { u->peer.free(&u->peer, u->peer.data, state); } if (ft_type == NGX_HTTP_UPSTREAM_FT_TIMEOUT) { ngx_log_error(NGX_LOG_ERR, r->connection->log, NGX_ETIMEDOUT, "upstream timed out"); } if (u->peer.cached && ft_type == NGX_HTTP_UPSTREAM_FT_ERROR) { status = 0; /* TODO: inform balancer instead */ u->peer.tries++; } else { switch(ft_type) { case NGX_HTTP_UPSTREAM_FT_TIMEOUT: status = NGX_HTTP_GATEWAY_TIME_OUT; break; case NGX_HTTP_UPSTREAM_FT_HTTP_500: status = NGX_HTTP_INTERNAL_SERVER_ERROR; break; case NGX_HTTP_UPSTREAM_FT_HTTP_404: status = NGX_HTTP_NOT_FOUND; break; /* * NGX_HTTP_UPSTREAM_FT_BUSY_LOCK and NGX_HTTP_UPSTREAM_FT_MAX_WAITING * never reach here */ default: status = NGX_HTTP_BAD_GATEWAY; } } if (r->connection->error) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_CLIENT_CLOSED_REQUEST); return; } if (status) { u->state->status = status; if (u->peer.tries == 0 || !(u->conf->next_upstream & ft_type)) { #if (NGX_HTTP_CACHE) if (u->cache_status == NGX_HTTP_CACHE_EXPIRED && (u->conf->cache_use_stale & ft_type)) { ngx_int_t rc; rc = u->reinit_request(r); if (rc == NGX_OK) { u->cache_status = NGX_HTTP_CACHE_STALE; rc = ngx_http_upstream_cache_send(r, u); } ngx_http_upstream_finalize_request(r, u, rc); return; } #endif ngx_http_upstream_finalize_request(r, u, status); return; } } if (u->peer.connection) { ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "close http upstream connection: %d", u->peer.connection->fd); #if (NGX_HTTP_SSL) if (u->peer.connection->ssl) { u->peer.connection->ssl->no_wait_shutdown = 1; u->peer.connection->ssl->no_send_shutdown = 1; (void) ngx_ssl_shutdown(u->peer.connection); } #endif if (u->peer.connection->pool) { ngx_destroy_pool(u->peer.connection->pool); } ngx_close_connection(u->peer.connection); } #if 0 if (u->conf->busy_lock && !u->busy_locked) { ngx_http_upstream_busy_lock(p); return; } #endif ngx_http_upstream_connect(r, u); } static void ngx_http_upstream_cleanup(void *data) { ngx_http_request_t *r = data; ngx_http_upstream_t *u; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "cleanup http upstream request: \"%V\"", &r->uri); u = r->upstream; if (u->resolved && u->resolved->ctx) { ngx_resolve_name_done(u->resolved->ctx); u->resolved->ctx = NULL; } ngx_http_upstream_finalize_request(r, u, NGX_DONE); } static void ngx_http_upstream_finalize_request(ngx_http_request_t *r, ngx_http_upstream_t *u, ngx_int_t rc) { ngx_time_t *tp; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "finalize http upstream request: %i", rc); if (u->cleanup) { *u->cleanup = NULL; u->cleanup = NULL; } if (u->resolved && u->resolved->ctx) { ngx_resolve_name_done(u->resolved->ctx); u->resolved->ctx = NULL; } if (u->state && u->state->response_sec) { tp = ngx_timeofday(); u->state->response_sec = tp->sec - u->state->response_sec; u->state->response_msec = tp->msec - u->state->response_msec; if (u->pipe) { u->state->response_length = u->pipe->read_length; } } u->finalize_request(r, rc); if (u->peer.free) { u->peer.free(&u->peer, u->peer.data, 0); } if (u->peer.connection) { #if (NGX_HTTP_SSL) /* TODO: do not shutdown persistent connection */ if (u->peer.connection->ssl) { /* * We send the "close notify" shutdown alert to the upstream only * and do not wait its "close notify" shutdown alert. * It is acceptable according to the TLS standard. */ u->peer.connection->ssl->no_wait_shutdown = 1; (void) ngx_ssl_shutdown(u->peer.connection); } #endif ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "close http upstream connection: %d", u->peer.connection->fd); if (u->peer.connection->pool) { ngx_destroy_pool(u->peer.connection->pool); } ngx_close_connection(u->peer.connection); } u->peer.connection = NULL; if (u->pipe && u->pipe->temp_file) { ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http upstream temp fd: %d", u->pipe->temp_file->file.fd); } #if (NGX_HTTP_CACHE) if (r->cache) { if (u->cacheable) { if (rc == NGX_HTTP_BAD_GATEWAY || rc == NGX_HTTP_GATEWAY_TIME_OUT) { time_t valid; valid = ngx_http_file_cache_valid(u->conf->cache_valid, rc); if (valid) { r->cache->valid_sec = ngx_time() + valid; r->cache->error = rc; } } } ngx_http_file_cache_free(r->cache, u->pipe->temp_file); } #endif if (u->header_sent && rc != NGX_HTTP_REQUEST_TIME_OUT && (rc == NGX_ERROR || rc >= NGX_HTTP_SPECIAL_RESPONSE)) { rc = 0; } if (rc == NGX_DECLINED) { return; } r->connection->log->action = "sending to client"; if (rc == 0) { rc = ngx_http_send_special(r, NGX_HTTP_LAST); } ngx_http_finalize_request(r, rc); } static ngx_int_t ngx_http_upstream_process_header_line(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { ngx_table_elt_t **ph; ph = (ngx_table_elt_t **) ((char *) &r->upstream->headers_in + offset); if (*ph == NULL) { *ph = h; } return NGX_OK; } static ngx_int_t ngx_http_upstream_ignore_header_line(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { return NGX_OK; } static ngx_int_t ngx_http_upstream_process_content_length(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { ngx_http_upstream_t *u; u = r->upstream; u->headers_in.content_length = h; u->headers_in.content_length_n = ngx_atoof(h->value.data, h->value.len); return NGX_OK; } static ngx_int_t ngx_http_upstream_process_set_cookie(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { #if (NGX_HTTP_CACHE) ngx_http_upstream_t *u; u = r->upstream; if (!(u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_SET_COOKIE)) { u->cacheable = 0; } #endif return NGX_OK; } static ngx_int_t ngx_http_upstream_process_cache_control(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { ngx_array_t *pa; ngx_table_elt_t **ph; ngx_http_upstream_t *u; u = r->upstream; pa = &u->headers_in.cache_control; if (pa->elts == NULL) { if (ngx_array_init(pa, r->pool, 2, sizeof(ngx_table_elt_t *)) != NGX_OK) { return NGX_ERROR; } } ph = ngx_array_push(pa); if (ph == NULL) { return NGX_ERROR; } *ph = h; #if (NGX_HTTP_CACHE) { u_char *p, *last; ngx_int_t n; if (u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_CACHE_CONTROL) { return NGX_OK; } if (r->cache == NULL) { return NGX_OK; } if (r->cache->valid_sec != 0) { return NGX_OK; } p = h->value.data; last = p + h->value.len; if (ngx_strlcasestrn(p, last, (u_char *) "no-cache", 8 - 1) != NULL || ngx_strlcasestrn(p, last, (u_char *) "no-store", 8 - 1) != NULL || ngx_strlcasestrn(p, last, (u_char *) "private", 7 - 1) != NULL) { u->cacheable = 0; return NGX_OK; } p = ngx_strlcasestrn(p, last, (u_char *) "max-age=", 8 - 1); if (p == NULL) { return NGX_OK; } n = 0; for (p += 8; p < last; p++) { if (*p == ',' || *p == ';' || *p == ' ') { break; } if (*p >= '0' && *p <= '9') { n = n * 10 + *p - '0'; continue; } u->cacheable = 0; return NGX_OK; } if (n == 0) { u->cacheable = 0; return NGX_OK; } r->cache->valid_sec = ngx_time() + n; } #endif return NGX_OK; } static ngx_int_t ngx_http_upstream_process_expires(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { ngx_http_upstream_t *u; u = r->upstream; u->headers_in.expires = h; #if (NGX_HTTP_CACHE) { time_t expires; if (u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_EXPIRES) { return NGX_OK; } if (r->cache == NULL) { return NGX_OK; } if (r->cache->valid_sec != 0) { return NGX_OK; } expires = ngx_http_parse_time(h->value.data, h->value.len); if (expires == NGX_ERROR || expires < ngx_time()) { u->cacheable = 0; return NGX_OK; } r->cache->valid_sec = expires; } #endif return NGX_OK; } static ngx_int_t ngx_http_upstream_process_accel_expires(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { ngx_http_upstream_t *u; u = r->upstream; u->headers_in.x_accel_expires = h; #if (NGX_HTTP_CACHE) { u_char *p; size_t len; ngx_int_t n; if (u->conf->ignore_headers & NGX_HTTP_UPSTREAM_IGN_XA_EXPIRES) { return NGX_OK; } if (r->cache == NULL) { return NGX_OK; } len = h->value.len; p = h->value.data; if (p[0] != '@') { n = ngx_atoi(p, len); switch (n) { case 0: u->cacheable = 0; case NGX_ERROR: return NGX_OK; default: r->cache->valid_sec = ngx_time() + n; return NGX_OK; } } p++; len--; n = ngx_atoi(p, len); if (n != NGX_ERROR) { r->cache->valid_sec = n; } } #endif return NGX_OK; } static ngx_int_t ngx_http_upstream_process_limit_rate(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { ngx_int_t n; r->upstream->headers_in.x_accel_limit_rate = h; n = ngx_atoi(h->value.data, h->value.len); if (n != NGX_ERROR) { r->limit_rate = (size_t) n; } return NGX_OK; } static ngx_int_t ngx_http_upstream_process_buffering(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { u_char c0, c1, c2; if (r->upstream->conf->change_buffering) { if (h->value.len == 2) { c0 = ngx_tolower(h->value.data[0]); c1 = ngx_tolower(h->value.data[1]); if (c0 == 'n' && c1 == 'o') { r->upstream->buffering = 0; } } else if (h->value.len == 3) { c0 = ngx_tolower(h->value.data[0]); c1 = ngx_tolower(h->value.data[1]); c2 = ngx_tolower(h->value.data[2]); if (c0 == 'y' && c1 == 'e' && c2 == 's') { r->upstream->buffering = 1; } } } return NGX_OK; } static ngx_int_t ngx_http_upstream_process_charset(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { r->headers_out.override_charset = &h->value; return NGX_OK; } static ngx_int_t ngx_http_upstream_process_connection(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { r->upstream->headers_in.connection = h; if (ngx_strlcasestrn(h->value.data, h->value.data + h->value.len, (u_char *) "close", 5 - 1) != NULL) { r->upstream->headers_in.connection_close = 1; } return NGX_OK; } static ngx_int_t ngx_http_upstream_process_transfer_encoding(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { r->upstream->headers_in.transfer_encoding = h; if (ngx_strlcasestrn(h->value.data, h->value.data + h->value.len, (u_char *) "chunked", 7 - 1) != NULL) { r->upstream->headers_in.chunked = 1; } return NGX_OK; } static ngx_int_t ngx_http_upstream_copy_header_line(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { ngx_table_elt_t *ho, **ph; ho = ngx_list_push(&r->headers_out.headers); if (ho == NULL) { return NGX_ERROR; } *ho = *h; if (offset) { ph = (ngx_table_elt_t **) ((char *) &r->headers_out + offset); *ph = ho; } return NGX_OK; } static ngx_int_t ngx_http_upstream_copy_multi_header_lines(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { ngx_array_t *pa; ngx_table_elt_t *ho, **ph; pa = (ngx_array_t *) ((char *) &r->headers_out + offset); if (pa->elts == NULL) { if (ngx_array_init(pa, r->pool, 2, sizeof(ngx_table_elt_t *)) != NGX_OK) { return NGX_ERROR; } } ph = ngx_array_push(pa); if (ph == NULL) { return NGX_ERROR; } ho = ngx_list_push(&r->headers_out.headers); if (ho == NULL) { return NGX_ERROR; } *ho = *h; *ph = ho; return NGX_OK; } static ngx_int_t ngx_http_upstream_copy_content_type(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { u_char *p, *last; r->headers_out.content_type_len = h->value.len; r->headers_out.content_type = h->value; r->headers_out.content_type_lowcase = NULL; for (p = h->value.data; *p; p++) { if (*p != ';') { continue; } last = p; while (*++p == ' ') { /* void */ } if (*p == '\0') { return NGX_OK; } if (ngx_strncasecmp(p, (u_char *) "charset=", 8) != 0) { continue; } p += 8; r->headers_out.content_type_len = last - h->value.data; if (*p == '"') { p++; } last = h->value.data + h->value.len; if (*(last - 1) == '"') { last--; } r->headers_out.charset.len = last - p; r->headers_out.charset.data = p; return NGX_OK; } return NGX_OK; } static ngx_int_t ngx_http_upstream_copy_last_modified(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { ngx_table_elt_t *ho; ho = ngx_list_push(&r->headers_out.headers); if (ho == NULL) { return NGX_ERROR; } *ho = *h; r->headers_out.last_modified = ho; #if (NGX_HTTP_CACHE) if (r->upstream->cacheable) { r->headers_out.last_modified_time = ngx_http_parse_time(h->value.data, h->value.len); } #endif return NGX_OK; } static ngx_int_t ngx_http_upstream_rewrite_location(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { ngx_int_t rc; ngx_table_elt_t *ho; ho = ngx_list_push(&r->headers_out.headers); if (ho == NULL) { return NGX_ERROR; } *ho = *h; if (r->upstream->rewrite_redirect) { rc = r->upstream->rewrite_redirect(r, ho, 0); if (rc == NGX_DECLINED) { return NGX_OK; } if (rc == NGX_OK) { r->headers_out.location = ho; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "rewritten location: \"%V\"", &ho->value); } return rc; } if (ho->value.data[0] != '/') { r->headers_out.location = ho; } /* * we do not set r->headers_out.location here to avoid the handling * the local redirects without a host name by ngx_http_header_filter() */ return NGX_OK; } static ngx_int_t ngx_http_upstream_rewrite_refresh(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { u_char *p; ngx_int_t rc; ngx_table_elt_t *ho; ho = ngx_list_push(&r->headers_out.headers); if (ho == NULL) { return NGX_ERROR; } *ho = *h; if (r->upstream->rewrite_redirect) { p = ngx_strcasestrn(ho->value.data, "url=", 4 - 1); if (p) { rc = r->upstream->rewrite_redirect(r, ho, p + 4 - ho->value.data); } else { return NGX_OK; } if (rc == NGX_DECLINED) { return NGX_OK; } if (rc == NGX_OK) { r->headers_out.refresh = ho; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "rewritten refresh: \"%V\"", &ho->value); } return rc; } r->headers_out.refresh = ho; return NGX_OK; } static ngx_int_t ngx_http_upstream_copy_allow_ranges(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { ngx_table_elt_t *ho; #if (NGX_HTTP_CACHE) if (r->cached) { r->allow_ranges = 1; return NGX_OK; } #endif ho = ngx_list_push(&r->headers_out.headers); if (ho == NULL) { return NGX_ERROR; } *ho = *h; r->headers_out.accept_ranges = ho; return NGX_OK; } #if (NGX_HTTP_GZIP) static ngx_int_t ngx_http_upstream_copy_content_encoding(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { ngx_table_elt_t *ho; ho = ngx_list_push(&r->headers_out.headers); if (ho == NULL) { return NGX_ERROR; } *ho = *h; r->headers_out.content_encoding = ho; return NGX_OK; } #endif static ngx_int_t ngx_http_upstream_add_variables(ngx_conf_t *cf) { ngx_http_variable_t *var, *v; for (v = ngx_http_upstream_vars; v->name.len; v++) { var = ngx_http_add_variable(cf, &v->name, v->flags); if (var == NULL) { return NGX_ERROR; } var->get_handler = v->get_handler; var->data = v->data; } return NGX_OK; } static ngx_int_t ngx_http_upstream_addr_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data) { u_char *p; size_t len; ngx_uint_t i; ngx_http_upstream_state_t *state; v->valid = 1; v->no_cacheable = 0; v->not_found = 0; if (r->upstream_states == NULL || r->upstream_states->nelts == 0) { v->not_found = 1; return NGX_OK; } len = 0; state = r->upstream_states->elts; for (i = 0; i < r->upstream_states->nelts; i++) { if (state[i].peer) { len += state[i].peer->len + 2; } else { len += 3; } } p = ngx_pnalloc(r->pool, len); if (p == NULL) { return NGX_ERROR; } v->data = p; i = 0; for ( ;; ) { if (state[i].peer) { p = ngx_cpymem(p, state[i].peer->data, state[i].peer->len); } if (++i == r->upstream_states->nelts) { break; } if (state[i].peer) { *p++ = ','; *p++ = ' '; } else { *p++ = ' '; *p++ = ':'; *p++ = ' '; if (++i == r->upstream_states->nelts) { break; } continue; } } v->len = p - v->data; return NGX_OK; } static ngx_int_t ngx_http_upstream_status_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data) { u_char *p; size_t len; ngx_uint_t i; ngx_http_upstream_state_t *state; v->valid = 1; v->no_cacheable = 0; v->not_found = 0; if (r->upstream_states == NULL || r->upstream_states->nelts == 0) { v->not_found = 1; return NGX_OK; } len = r->upstream_states->nelts * (3 + 2); p = ngx_pnalloc(r->pool, len); if (p == NULL) { return NGX_ERROR; } v->data = p; i = 0; state = r->upstream_states->elts; for ( ;; ) { if (state[i].status) { p = ngx_sprintf(p, "%ui", state[i].status); } else { *p++ = '-'; } if (++i == r->upstream_states->nelts) { break; } if (state[i].peer) { *p++ = ','; *p++ = ' '; } else { *p++ = ' '; *p++ = ':'; *p++ = ' '; if (++i == r->upstream_states->nelts) { break; } continue; } } v->len = p - v->data; return NGX_OK; } static ngx_int_t ngx_http_upstream_response_time_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data) { u_char *p; size_t len; ngx_uint_t i; ngx_msec_int_t ms; ngx_http_upstream_state_t *state; v->valid = 1; v->no_cacheable = 0; v->not_found = 0; if (r->upstream_states == NULL || r->upstream_states->nelts == 0) { v->not_found = 1; return NGX_OK; } len = r->upstream_states->nelts * (NGX_TIME_T_LEN + 4 + 2); p = ngx_pnalloc(r->pool, len); if (p == NULL) { return NGX_ERROR; } v->data = p; i = 0; state = r->upstream_states->elts; for ( ;; ) { if (state[i].status) { ms = (ngx_msec_int_t) (state[i].response_sec * 1000 + state[i].response_msec); ms = ngx_max(ms, 0); p = ngx_sprintf(p, "%d.%03d", ms / 1000, ms % 1000); } else { *p++ = '-'; } if (++i == r->upstream_states->nelts) { break; } if (state[i].peer) { *p++ = ','; *p++ = ' '; } else { *p++ = ' '; *p++ = ':'; *p++ = ' '; if (++i == r->upstream_states->nelts) { break; } continue; } } v->len = p - v->data; return NGX_OK; } static ngx_int_t ngx_http_upstream_response_length_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data) { u_char *p; size_t len; ngx_uint_t i; ngx_http_upstream_state_t *state; v->valid = 1; v->no_cacheable = 0; v->not_found = 0; if (r->upstream_states == NULL || r->upstream_states->nelts == 0) { v->not_found = 1; return NGX_OK; } len = r->upstream_states->nelts * (NGX_OFF_T_LEN + 2); p = ngx_pnalloc(r->pool, len); if (p == NULL) { return NGX_ERROR; } v->data = p; i = 0; state = r->upstream_states->elts; for ( ;; ) { p = ngx_sprintf(p, "%O", state[i].response_length); if (++i == r->upstream_states->nelts) { break; } if (state[i].peer) { *p++ = ','; *p++ = ' '; } else { *p++ = ' '; *p++ = ':'; *p++ = ' '; if (++i == r->upstream_states->nelts) { break; } continue; } } v->len = p - v->data; return NGX_OK; } ngx_int_t ngx_http_upstream_header_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data) { if (r->upstream == NULL) { v->not_found = 1; return NGX_OK; } return ngx_http_variable_unknown_header(v, (ngx_str_t *) data, &r->upstream->headers_in.headers.part, sizeof("upstream_http_") - 1); } #if (NGX_HTTP_CACHE) ngx_int_t ngx_http_upstream_cache_status(ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data) { ngx_uint_t n; if (r->upstream == NULL || r->upstream->cache_status == 0) { v->not_found = 1; return NGX_OK; } n = r->upstream->cache_status - 1; v->valid = 1; v->no_cacheable = 0; v->not_found = 0; v->len = ngx_http_cache_status[n].len; v->data = ngx_http_cache_status[n].data; return NGX_OK; } #endif static char * ngx_http_upstream(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy) { char *rv; void *mconf; ngx_str_t *value; ngx_url_t u; ngx_uint_t m; ngx_conf_t pcf; ngx_http_module_t *module; ngx_http_conf_ctx_t *ctx, *http_ctx; ngx_http_upstream_srv_conf_t *uscf; ngx_memzero(&u, sizeof(ngx_url_t)); value = cf->args->elts; u.host = value[1]; u.no_resolve = 1; uscf = ngx_http_upstream_add(cf, &u, NGX_HTTP_UPSTREAM_CREATE |NGX_HTTP_UPSTREAM_WEIGHT |NGX_HTTP_UPSTREAM_MAX_FAILS |NGX_HTTP_UPSTREAM_FAIL_TIMEOUT |NGX_HTTP_UPSTREAM_DOWN |NGX_HTTP_UPSTREAM_BACKUP); if (uscf == NULL) { return NGX_CONF_ERROR; } ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_conf_ctx_t)); if (ctx == NULL) { return NGX_CONF_ERROR; } http_ctx = cf->ctx; ctx->main_conf = http_ctx->main_conf; /* the upstream{}'s srv_conf */ ctx->srv_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module); if (ctx->srv_conf == NULL) { return NGX_CONF_ERROR; } ctx->srv_conf[ngx_http_upstream_module.ctx_index] = uscf; uscf->srv_conf = ctx->srv_conf; /* the upstream{}'s loc_conf */ ctx->loc_conf = ngx_pcalloc(cf->pool, sizeof(void *) * ngx_http_max_module); if (ctx->loc_conf == NULL) { return NGX_CONF_ERROR; } for (m = 0; ngx_modules[m]; m++) { if (ngx_modules[m]->type != NGX_HTTP_MODULE) { continue; } module = ngx_modules[m]->ctx; if (module->create_srv_conf) { mconf = module->create_srv_conf(cf); if (mconf == NULL) { return NGX_CONF_ERROR; } ctx->srv_conf[ngx_modules[m]->ctx_index] = mconf; } if (module->create_loc_conf) { mconf = module->create_loc_conf(cf); if (mconf == NULL) { return NGX_CONF_ERROR; } ctx->loc_conf[ngx_modules[m]->ctx_index] = mconf; } } /* parse inside upstream{} */ pcf = *cf; cf->ctx = ctx; cf->cmd_type = NGX_HTTP_UPS_CONF; rv = ngx_conf_parse(cf, NULL); *cf = pcf; if (rv != NGX_CONF_OK) { return rv; } if (uscf->servers == NULL) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "no servers are inside upstream"); return NGX_CONF_ERROR; } return rv; } static char * ngx_http_upstream_server(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { ngx_http_upstream_srv_conf_t *uscf = conf; time_t fail_timeout; ngx_str_t *value, s; ngx_url_t u; ngx_int_t weight, max_fails; ngx_uint_t i; ngx_http_upstream_server_t *us; if (uscf->servers == NULL) { uscf->servers = ngx_array_create(cf->pool, 4, sizeof(ngx_http_upstream_server_t)); if (uscf->servers == NULL) { return NGX_CONF_ERROR; } } us = ngx_array_push(uscf->servers); if (us == NULL) { return NGX_CONF_ERROR; } ngx_memzero(us, sizeof(ngx_http_upstream_server_t)); value = cf->args->elts; ngx_memzero(&u, sizeof(ngx_url_t)); u.url = value[1]; u.default_port = 80; if (ngx_parse_url(cf->pool, &u) != NGX_OK) { if (u.err) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s in upstream \"%V\"", u.err, &u.url); } return NGX_CONF_ERROR; } weight = 1; max_fails = 1; fail_timeout = 10; for (i = 2; i < cf->args->nelts; i++) { if (ngx_strncmp(value[i].data, "weight=", 7) == 0) { if (!(uscf->flags & NGX_HTTP_UPSTREAM_WEIGHT)) { goto invalid; } weight = ngx_atoi(&value[i].data[7], value[i].len - 7); if (weight == NGX_ERROR || weight == 0) { goto invalid; } continue; } if (ngx_strncmp(value[i].data, "max_fails=", 10) == 0) { if (!(uscf->flags & NGX_HTTP_UPSTREAM_MAX_FAILS)) { goto invalid; } max_fails = ngx_atoi(&value[i].data[10], value[i].len - 10); if (max_fails == NGX_ERROR) { goto invalid; } continue; } if (ngx_strncmp(value[i].data, "fail_timeout=", 13) == 0) { if (!(uscf->flags & NGX_HTTP_UPSTREAM_FAIL_TIMEOUT)) { goto invalid; } s.len = value[i].len - 13; s.data = &value[i].data[13]; fail_timeout = ngx_parse_time(&s, 1); if (fail_timeout == NGX_ERROR) { goto invalid; } continue; } if (ngx_strncmp(value[i].data, "backup", 6) == 0) { if (!(uscf->flags & NGX_HTTP_UPSTREAM_BACKUP)) { goto invalid; } us->backup = 1; continue; } if (ngx_strncmp(value[i].data, "down", 4) == 0) { if (!(uscf->flags & NGX_HTTP_UPSTREAM_DOWN)) { goto invalid; } us->down = 1; continue; } goto invalid; } us->addrs = u.addrs; us->naddrs = u.naddrs; us->weight = weight; us->max_fails = max_fails; us->fail_timeout = fail_timeout; return NGX_CONF_OK; invalid: ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", &value[i]); return NGX_CONF_ERROR; } ngx_http_upstream_srv_conf_t * ngx_http_upstream_add(ngx_conf_t *cf, ngx_url_t *u, ngx_uint_t flags) { ngx_uint_t i; ngx_http_upstream_server_t *us; ngx_http_upstream_srv_conf_t *uscf, **uscfp; ngx_http_upstream_main_conf_t *umcf; if (!(flags & NGX_HTTP_UPSTREAM_CREATE)) { if (ngx_parse_url(cf->pool, u) != NGX_OK) { if (u->err) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%s in upstream \"%V\"", u->err, &u->url); } return NULL; } } umcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_upstream_module); uscfp = umcf->upstreams.elts; for (i = 0; i < umcf->upstreams.nelts; i++) { if (uscfp[i]->host.len != u->host.len || ngx_strncasecmp(uscfp[i]->host.data, u->host.data, u->host.len) != 0) { continue; } if ((flags & NGX_HTTP_UPSTREAM_CREATE) && (uscfp[i]->flags & NGX_HTTP_UPSTREAM_CREATE)) { ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "duplicate upstream \"%V\"", &u->host); return NULL; } if ((uscfp[i]->flags & NGX_HTTP_UPSTREAM_CREATE) && u->port) { ngx_conf_log_error(NGX_LOG_WARN, cf, 0, "upstream \"%V\" may not have port %d", &u->host, u->port); return NULL; } if ((flags & NGX_HTTP_UPSTREAM_CREATE) && uscfp[i]->port) { ngx_log_error(NGX_LOG_WARN, cf->log, 0, "upstream \"%V\" may not have port %d in %s:%ui", &u->host, uscfp[i]->port, uscfp[i]->file_name, uscfp[i]->line); return NULL; } if (uscfp[i]->port != u->port) { continue; } if (uscfp[i]->default_port && u->default_port && uscfp[i]->default_port != u->default_port) { continue; } return uscfp[i]; } uscf = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_srv_conf_t)); if (uscf == NULL) { return NULL; } uscf->flags = flags; uscf->host = u->host; uscf->file_name = cf->conf_file->file.name.data; uscf->line = cf->conf_file->line; uscf->port = u->port; uscf->default_port = u->default_port; if (u->naddrs == 1) { uscf->servers = ngx_array_create(cf->pool, 1, sizeof(ngx_http_upstream_server_t)); if (uscf->servers == NULL) { return NGX_CONF_ERROR; } us = ngx_array_push(uscf->servers); if (us == NULL) { return NGX_CONF_ERROR; } ngx_memzero(us, sizeof(ngx_http_upstream_server_t)); us->addrs = u->addrs; us->naddrs = u->naddrs; } uscfp = ngx_array_push(&umcf->upstreams); if (uscfp == NULL) { return NULL; } *uscfp = uscf; return uscf; } char * ngx_http_upstream_bind_set_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) { char *p = conf; ngx_int_t rc; ngx_str_t *value; ngx_addr_t **paddr; paddr = (ngx_addr_t **) (p + cmd->offset); *paddr = ngx_palloc(cf->pool, sizeof(ngx_addr_t)); if (*paddr == NULL) { return NGX_CONF_ERROR; } value = cf->args->elts; rc = ngx_parse_addr(cf->pool, *paddr, value[1].data, value[1].len); switch (rc) { case NGX_OK: (*paddr)->name = value[1]; return NGX_CONF_OK; case NGX_DECLINED: ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid address \"%V\"", &value[1]); default: return NGX_CONF_ERROR; } } ngx_int_t ngx_http_upstream_hide_headers_hash(ngx_conf_t *cf, ngx_http_upstream_conf_t *conf, ngx_http_upstream_conf_t *prev, ngx_str_t *default_hide_headers, ngx_hash_init_t *hash) { ngx_str_t *h; ngx_uint_t i, j; ngx_array_t hide_headers; ngx_hash_key_t *hk; if (conf->hide_headers == NGX_CONF_UNSET_PTR && conf->pass_headers == NGX_CONF_UNSET_PTR) { conf->hide_headers_hash = prev->hide_headers_hash; if (conf->hide_headers_hash.buckets #if (NGX_HTTP_CACHE) && ((conf->cache == NULL) == (prev->cache == NULL)) #endif ) { return NGX_OK; } conf->hide_headers = prev->hide_headers; conf->pass_headers = prev->pass_headers; } else { if (conf->hide_headers == NGX_CONF_UNSET_PTR) { conf->hide_headers = prev->hide_headers; } if (conf->pass_headers == NGX_CONF_UNSET_PTR) { conf->pass_headers = prev->pass_headers; } } if (ngx_array_init(&hide_headers, cf->temp_pool, 4, sizeof(ngx_hash_key_t)) != NGX_OK) { return NGX_ERROR; } for (h = default_hide_headers; h->len; h++) { hk = ngx_array_push(&hide_headers); if (hk == NULL) { return NGX_ERROR; } hk->key = *h; hk->key_hash = ngx_hash_key_lc(h->data, h->len); hk->value = (void *) 1; } if (conf->hide_headers != NGX_CONF_UNSET_PTR) { h = conf->hide_headers->elts; for (i = 0; i < conf->hide_headers->nelts; i++) { hk = hide_headers.elts; for (j = 0; j < hide_headers.nelts; j++) { if (ngx_strcasecmp(h[i].data, hk[j].key.data) == 0) { goto exist; } } hk = ngx_array_push(&hide_headers); if (hk == NULL) { return NGX_ERROR; } hk->key = h[i]; hk->key_hash = ngx_hash_key_lc(h[i].data, h[i].len); hk->value = (void *) 1; exist: continue; } } if (conf->pass_headers != NGX_CONF_UNSET_PTR) { h = conf->pass_headers->elts; hk = hide_headers.elts; for (i = 0; i < conf->pass_headers->nelts; i++) { for (j = 0; j < hide_headers.nelts; j++) { if (hk[j].key.data == NULL) { continue; } if (ngx_strcasecmp(h[i].data, hk[j].key.data) == 0) { hk[j].key.data = NULL; break; } } } } hash->hash = &conf->hide_headers_hash; hash->key = ngx_hash_key_lc; hash->pool = cf->pool; hash->temp_pool = NULL; return ngx_hash_init(hash, hide_headers.elts, hide_headers.nelts); } static void * ngx_http_upstream_create_main_conf(ngx_conf_t *cf) { ngx_http_upstream_main_conf_t *umcf; umcf = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_main_conf_t)); if (umcf == NULL) { return NULL; } if (ngx_array_init(&umcf->upstreams, cf->pool, 4, sizeof(ngx_http_upstream_srv_conf_t *)) != NGX_OK) { return NULL; } return umcf; } static char * ngx_http_upstream_init_main_conf(ngx_conf_t *cf, void *conf) { ngx_http_upstream_main_conf_t *umcf = conf; ngx_uint_t i; ngx_array_t headers_in; ngx_hash_key_t *hk; ngx_hash_init_t hash; ngx_http_upstream_init_pt init; ngx_http_upstream_header_t *header; ngx_http_upstream_srv_conf_t **uscfp; uscfp = umcf->upstreams.elts; for (i = 0; i < umcf->upstreams.nelts; i++) { init = uscfp[i]->peer.init_upstream ? uscfp[i]->peer.init_upstream: ngx_http_upstream_init_round_robin; if (init(cf, uscfp[i]) != NGX_OK) { return NGX_CONF_ERROR; } } /* upstream_headers_in_hash */ if (ngx_array_init(&headers_in, cf->temp_pool, 32, sizeof(ngx_hash_key_t)) != NGX_OK) { return NGX_CONF_ERROR; } for (header = ngx_http_upstream_headers_in; header->name.len; header++) { hk = ngx_array_push(&headers_in); if (hk == NULL) { return NGX_CONF_ERROR; } hk->key = header->name; hk->key_hash = ngx_hash_key_lc(header->name.data, header->name.len); hk->value = header; } hash.hash = &umcf->headers_in_hash; hash.key = ngx_hash_key_lc; hash.max_size = 512; hash.bucket_size = ngx_align(64, ngx_cacheline_size); hash.name = "upstream_headers_in_hash"; hash.pool = cf->pool; hash.temp_pool = NULL; if (ngx_hash_init(&hash, headers_in.elts, headers_in.nelts) != NGX_OK) { return NGX_CONF_ERROR; } return NGX_CONF_OK; }