/* * Copyright (C) Igor Sysoev */ #include #include #include 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_event_t *wev); static void ngx_http_upstream_process_header(ngx_event_t *rev); 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_body(ngx_event_t *ev); 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_body(ngx_event_t *ev); static void ngx_http_upstream_dummy_handler(ngx_event_t *wev); 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_multi_header_lines(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_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_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_content_length(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); #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 size_t ngx_http_upstream_log_status_getlen(ngx_http_request_t *r, uintptr_t data); static u_char *ngx_http_upstream_log_status(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op); static size_t ngx_http_upstream_log_response_time_getlen(ngx_http_request_t *r, uintptr_t data); static u_char *ngx_http_upstream_log_response_time(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op); static ngx_int_t ngx_http_upstream_add_variables(ngx_conf_t *cf); 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 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); static void ngx_http_upstream_ssl_shutdown(ngx_connection_t *c, ngx_peer_t *peer); #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_header_line, offsetof(ngx_http_upstream_headers_in_t, content_length), ngx_http_upstream_copy_content_length, 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("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_ignore_header_line, 0, 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_ignore_header_line, 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_multi_header_lines, offsetof(ngx_http_upstream_headers_in_t, cache_control), ngx_http_upstream_copy_multi_header_lines, offsetof(ngx_http_headers_out_t, cache_control), 1 }, { ngx_string("Expires"), ngx_http_upstream_process_header_line, offsetof(ngx_http_upstream_headers_in_t, expires), 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_header_line, offsetof(ngx_http_headers_out_t, accept_ranges), 1 }, { ngx_string("Connection"), ngx_http_upstream_ignore_header_line, 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_header_line, offsetof(ngx_http_upstream_headers_in_t, x_accel_expires), 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_ignore_header_line, 0, 0 }, { ngx_string("X-Accel-Limit-Rate"), ngx_http_upstream_process_limit_rate, 0, ngx_http_upstream_ignore_header_line, 0, 0 }, { ngx_string("X-Accel-Buffering"), ngx_http_upstream_process_buffering, 0, ngx_http_upstream_ignore_header_line, 0, 0 }, { ngx_string("X-Accel-Charset"), ngx_http_upstream_process_charset, 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_TAKE12, 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_log_op_name_t ngx_http_upstream_log_fmt_ops[] = { { ngx_string("upstream_status"), 0, NULL, ngx_http_upstream_log_status_getlen, ngx_http_upstream_log_status }, { ngx_string("upstream_response_time"), 0, NULL, ngx_http_upstream_log_response_time_getlen, ngx_http_upstream_log_response_time }, { ngx_null_string, 0, NULL, NULL, NULL } }; static ngx_http_variable_t ngx_http_upstream_vars[] = { { ngx_string("upstream_status"), NULL, ngx_http_upstream_status_variable, 0, NGX_HTTP_VAR_NOHASH, 0 }, { ngx_string("upstream_response_time"), NULL, ngx_http_upstream_response_time_variable, 0, NGX_HTTP_VAR_NOHASH, 0 }, { ngx_null_string, NULL, NULL, 0, 0, 0 } }; void ngx_http_upstream_init(ngx_http_request_t *r) { ngx_connection_t *c; ngx_http_cleanup_t *cln; ngx_http_upstream_t *u; ngx_http_core_loc_conf_t *clcf; 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); } u = r->upstream; if (!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 (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; } } } 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.log = r->connection->log; clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); u->output.sendfile = r->connection->sendfile; 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 (ngx_array_init(&u->states, r->pool, u->peer.peers->number, sizeof(ngx_http_upstream_state_t)) != NGX_OK) { ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } 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; ngx_http_upstream_connect(r, u); } 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_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) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_CLIENT_CLOSED_REQUEST); return; } if (u->peer.connection == NULL) { 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->cachable && 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; } return; } #endif n = recv(c->fd, buf, 1, MSG_PEEK); err = ngx_socket_errno; /* * we do not need to disable the write event because * that event has NGX_USE_CLEAR_EVENT type */ if (ev->write && (n >= 0 || err == NGX_EAGAIN)) { return; } if ((ngx_event_flags & NGX_USE_LEVEL_EVENT) && ev->active) { if (ngx_del_event(ev, NGX_READ_EVENT, 0) == NGX_ERROR) { 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->cachable && 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); return; } } 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_time) { tp = ngx_timeofday(); u->state->response_time = tp->sec * 1000 + tp->msec - u->state->response_time; } u->state = ngx_array_push(&u->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_time = tp->sec * 1000 + 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.peers->peer[u->peer.cur_peer].name; if (rc == NGX_BUSY) { ngx_log_error(NGX_LOG_ERR, r->connection->log, 0, "no live upstreams"); } if (rc == NGX_BUSY || 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_send_request_handler; c->read->handler = ngx_http_upstream_process_header; c->sendfile = r->connection->sendfile; c->pool = r->pool; c->read->log = c->write->log = c->log = r->connection->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->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->conf->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; ngx_peer_t *peer; if (ngx_ssl_create_connection(u->conf->ssl, c, NGX_SSL_BUFFER|NGX_SSL_CLIENT) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } c->sendfile = 0; u->output.sendfile = 0; peer = &u->peer.peers->peer[u->peer.cur_peer]; if (ngx_ssl_set_session(c, peer->ssl_session) != 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) { c->write->handler = ngx_http_upstream_send_request_handler; c->read->handler = ngx_http_upstream_process_header; 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; } ngx_memzero(&r->upstream->headers_in, sizeof(ngx_http_upstream_headers_in_t)); if (ngx_list_init(&r->upstream->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 */ #if 0 if (u->cache) { u->buffer.pos = u->buffer.start + u->cache->ctx.header_size; u->buffer.last = u->buffer.pos; } else { u->buffer.pos = u->buffer.start; u->buffer.last = u->buffer.start; } #else u->buffer.pos = u->buffer.start; u->buffer.last = u->buffer.start; #endif return NGX_OK; } static void ngx_http_upstream_send_request(ngx_http_request_t *r, ngx_http_upstream_t *u) { int rc, err; socklen_t len; 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) { #if (NGX_HAVE_KQUEUE) if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) { if (c->write->pending_eof) { (void) ngx_connection_error(c, c->write->kq_errno, "kevent() reported that connect() failed"); ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_ERROR); return; } } 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) { (void) ngx_connection_error(c, err, "connect() failed"); 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_ERROR) { 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(c->read); return; } #endif c->write->handler = ngx_http_upstream_dummy_handler; if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } } static void ngx_http_upstream_send_request_handler(ngx_event_t *wev) { ngx_connection_t *c; ngx_http_request_t *r; ngx_http_upstream_t *u; c = wev->data; r = c->data; u = r->upstream; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, wev->log, 0, "http upstream send request handler"); if (wev->timedout) { ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_TIMEOUT); return; } #if (NGX_HTTP_SSL) if (u->conf->ssl && c->ssl == NULL) { ngx_http_upstream_ssl_init_connection(r, u, c); return; } #endif if (u->header_sent) { wev->handler = ngx_http_upstream_dummy_handler; (void) ngx_handle_write_event(wev, 0); return; } ngx_http_upstream_send_request(r, u); } static void ngx_http_upstream_process_header(ngx_event_t *rev) { ssize_t n; ngx_int_t rc; ngx_str_t *uri, args; ngx_uint_t i, flags; ngx_list_part_t *part; ngx_table_elt_t *h; ngx_connection_t *c; ngx_http_request_t *r; ngx_http_upstream_t *u; ngx_http_err_page_t *err_page; ngx_http_core_loc_conf_t *clcf; ngx_http_upstream_header_t *hh; ngx_http_upstream_main_conf_t *umcf; c = rev->data; r = c->data; u = r->upstream; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, rev->log, 0, "http upstream process header"); c->log->action = "reading response header from upstream"; if (rev->timedout) { ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_TIMEOUT); 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(&r->upstream->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 0 if (u->cache) { u->buffer.pos += u->cache->ctx.header_size; u->buffer.last = u->buffer.pos; } #endif } n = u->peer.connection->recv(u->peer.connection, 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(rev, 0) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } return; } if (n == 0) { ngx_log_error(NGX_LOG_ERR, rev->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 0 ngx_add_timer(rev, u->read_timeout); #endif if (u->buffer.pos == u->buffer.end) { ngx_log_error(NGX_LOG_ERR, rev->log, 0, "upstream sent too big header"); ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_INVALID_HEADER); return; } if (ngx_handle_read_event(rev, 0) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } return; } if (rc == NGX_HTTP_UPSTREAM_INVALID_HEADER) { ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_INVALID_HEADER); return; } if (rc == NGX_ERROR || rc == NGX_HTTP_INTERNAL_SERVER_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_INTERNAL_SERVER_ERROR) { if (u->peer.tries > 1 && (u->conf->next_upstream & NGX_HTTP_UPSTREAM_FT_HTTP_500)) { ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_HTTP_500); return; } #if (NGX_HTTP_CACHE) if (u->peer.tries == 0 && u->stale && (u->conf->use_stale & NGX_HTTP_UPSTREAM_FT_HTTP_500)) { ngx_http_upstream_finalize_request(r, u, ngx_http_send_cached_response(r)); return; } #endif } if (u->headers_in.status_n == NGX_HTTP_NOT_FOUND) { if (u->peer.tries > 1 && u->conf->next_upstream & NGX_HTTP_UPSTREAM_FT_HTTP_404) { ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_HTTP_404); return; } if (u->conf->redirect_404) { rc = (r->err_ctx == NULL) ? 404 : 204; ngx_http_upstream_finalize_request(r, u, rc); return; } } if (u->headers_in.status_n >= NGX_HTTP_BAD_REQUEST && u->conf->intercept_errors && r->err_ctx == NULL) { clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); if (clcf->error_pages) { err_page = clcf->error_pages->elts; for (i = 0; i < clcf->error_pages->nelts; i++) { if (err_page[i].status == (ngx_int_t) u->headers_in.status_n) { if (u->headers_in.status_n == NGX_HTTP_UNAUTHORIZED) { r->headers_out.www_authenticate = ngx_list_push(&r->headers_out.headers); if (r->headers_out.www_authenticate == NULL) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } *r->headers_out.www_authenticate = *u->headers_in.www_authenticate; } ngx_http_upstream_finalize_request(r, u, u->headers_in.status_n); return; } } } } if (r->upstream->headers_in.x_accel_redirect) { ngx_http_upstream_finalize_request(r, u, NGX_DECLINED); umcf = ngx_http_get_module_main_conf(r, ngx_http_upstream_module); part = &r->upstream->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_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } } } uri = &r->upstream->headers_in.x_accel_redirect->value; args.len = 0; args.data = NULL; flags = 0; if (ngx_http_parse_unsafe_uri(r, uri, &args, &flags) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_NOT_FOUND); return; } if (flags & NGX_HTTP_ZERO_IN_URI) { r->zero_in_uri = 1; } if (r->method != NGX_HTTP_HEAD) { r->method = NGX_HTTP_GET; } ngx_http_internal_redirect(r, uri, &args); return; } ngx_http_upstream_send_response(r, u); } static void ngx_http_upstream_send_response(ngx_http_request_t *r, ngx_http_upstream_t *u) { int tcp_nodelay; ssize_t size; ngx_int_t rc; ngx_uint_t i; ngx_list_part_t *part; ngx_table_elt_t *h; ngx_event_pipe_t *p; ngx_connection_t *c; ngx_pool_cleanup_t *cl; ngx_pool_cleanup_file_t *clf; ngx_http_core_loc_conf_t *clcf; 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); part = &r->upstream->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; } 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; } } 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; if (r->headers_out.content_length_n != -1) { u->length = (size_t) r->headers_out.content_length_n; } else { u->length = NGX_MAX_SIZE_T_VALUE; } 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; } u->header_sent = 1; if (r->request_body && r->request_body->temp_file) { for (cl = r->pool->cleanup; cl; cl = cl->next) { if (cl->handler == ngx_pool_cleanup_file) { clf = cl->data; if (clf->fd == r->request_body->temp_file->file.fd) { cl->handler(clf); cl->handler = NULL; r->request_body->temp_file->file.fd = NGX_INVALID_FILE; break; } } } } c = r->connection; 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->peer.connection->read->handler = ngx_http_upstream_process_non_buffered_body; 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; } size = u->buffer.last - u->buffer.pos; if (size) { u->buffer.last = u->buffer.pos; if (u->input_filter(u->input_filter_ctx, size) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, 0); return; } ngx_http_upstream_process_non_buffered_body(c->write); } 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; } } return; } /* TODO: preallocate event_pipe bufs, look "Content-Length" */ #if 0 if (u->cache && u->cache->ctx.file.fd != NGX_INVALID_FILE) { if (ngx_close_file(u->cache->ctx.file.fd) == NGX_FILE_ERROR) { ngx_log_error(NGX_LOG_ALERT, c->log, ngx_errno, ngx_close_file_n " \"%s\" failed", u->cache->ctx.file.name.data); } } if (u->cachable) { header = (ngx_http_cache_header_t *) u->buffer->start; header->expires = u->cache->ctx.expires; header->last_modified = u->cache->ctx.last_modified; header->date = u->cache->ctx.date; header->length = r->headers_out.content_length_n; u->cache->ctx.length = r->headers_out.content_length_n; header->key_len = u->cache->ctx.key0.len; ngx_memcpy(&header->key, u->cache->ctx.key0.data, header->key_len); header->key[header->key_len] = LF; } #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->cachable = u->cachable; 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 (u->cachable) { 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->cachable) { 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; u->peer.connection->read->handler = ngx_http_upstream_process_body; r->write_event_handler = ngx_http_upstream_process_downstream; ngx_http_upstream_process_body(u->peer.connection->read); } static void ngx_http_upstream_process_non_buffered_downstream(ngx_http_request_t *r) { ngx_http_upstream_process_non_buffered_body(r->connection->write); } static void ngx_http_upstream_process_non_buffered_body(ngx_event_t *ev) { size_t size; ssize_t n; ngx_buf_t *b; ngx_int_t rc; ngx_uint_t do_write; ngx_connection_t *c, *client; ngx_http_request_t *r; ngx_http_upstream_t *u; ngx_http_core_loc_conf_t *clcf; c = ev->data; if (ev->write) { ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http upstream process non buffered downstream"); c->log->action = "sending to client"; } else { ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http upstream process non buffered upstream"); c->log->action = "reading upstream"; } if (ev->timedout) { if (ev->write) { c->timedout = 1; ngx_connection_error(c, NGX_ETIMEDOUT, "client timed out"); } else { ngx_connection_error(c, NGX_ETIMEDOUT, "upstream timed out"); } } r = c->data; u = r->upstream; client = r->connection; b = &u->buffer; clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); do_write = ev->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 (client->destroyed) { return; } if (rc == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, 0); return; } ngx_chain_update_chains(&u->free_bufs, &u->busy_bufs, &u->out_bufs, u->output.tag); } if (u->busy_bufs == NULL) { if (u->length == 0 || u->peer.connection->read->eof || u->peer.connection->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 > u->length) { size = u->length; } if (size && u->peer.connection->read->ready) { n = u->peer.connection->recv(u->peer.connection, b->last, size); if (n == NGX_AGAIN) { break; } if (n > 0) { 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; } if (client->data == r) { if (ngx_handle_write_event(client->write, clcf->send_lowat) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, 0); return; } } if (client->write->active) { ngx_add_timer(client->write, clcf->send_timeout); } else if (client->write->timer_set) { ngx_del_timer(client->write); } if (ngx_handle_read_event(u->peer.connection->read, 0) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, 0); return; } if (u->peer.connection->read->active) { ngx_add_timer(u->peer.connection->read, u->conf->read_timeout); } else if (u->peer.connection->read->timer_set) { ngx_del_timer(u->peer.connection->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; if (u->length == NGX_MAX_SIZE_T_VALUE) { return NGX_OK; } u->length -= bytes; return NGX_OK; } static void ngx_http_upstream_process_downstream(ngx_http_request_t *r) { ngx_http_upstream_process_body(r->connection->write); } static void ngx_http_upstream_process_body(ngx_event_t *ev) { ngx_event_pipe_t *p; ngx_connection_t *c, *downstream; ngx_http_request_t *r; ngx_http_upstream_t *u; c = ev->data; r = c->data; u = r->upstream; downstream = r->connection; if (ev->write) { ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http upstream process downstream"); c->log->action = "sending to client"; } else { ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http upstream process upstream"); c->log->action = "reading upstream"; } p = u->pipe; if (ev->timedout) { if (ev->write) { if (ev->delayed) { ev->timedout = 0; ev->delayed = 0; if (!ev->ready) { ngx_add_timer(ev, p->send_timeout); if (ngx_handle_write_event(ev, p->send_lowat) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, 0); return; } return; } if (ngx_event_pipe(p, ev->write) == NGX_ABORT) { if (downstream->destroyed) { return; } 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 { p->upstream_error = 1; ngx_connection_error(c, NGX_ETIMEDOUT, "upstream timed out"); } } else { if (ev->write && ev->delayed) { ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http downstream delayed"); if (ngx_handle_write_event(ev, p->send_lowat) == NGX_ERROR) { return; } return; } if (ngx_event_pipe(p, ev->write) == NGX_ABORT) { if (downstream->destroyed) { return; } ngx_http_upstream_finalize_request(r, u, 0); return; } } if (u->peer.connection) { #if (NGX_HTTP_FILE_CACHE) if (p->upstream_done && u->cachable) { if (ngx_http_cache_update(r) == NGX_ERROR) { ngx_http_busy_unlock(u->conf->busy_lock, &u->busy_lock); ngx_http_upstream_finalize_request(r, u, 0); return; } } else if (p->upstream_eof && u->cachable) { /* TODO: check length & update cache */ if (ngx_http_cache_update(r) == NGX_ERROR) { ngx_http_busy_unlock(u->conf->busy_lock, &u->busy_lock); ngx_http_upstream_finalize_request(r, u, 0); return; } } #endif if (p->upstream_done || p->upstream_eof || p->upstream_error) { ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->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, c->log, 0, "http upstream downstream error"); if (!u->cachable && u->peer.connection) { ngx_http_upstream_finalize_request(r, u, 0); } } } static void ngx_http_upstream_dummy_handler(ngx_event_t *wev) { ngx_log_debug0(NGX_LOG_DEBUG_HTTP, wev->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, down; ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http next upstream, %xD", 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) { down = 0; } else { down = 1; } ngx_event_connect_peer_failed(&u->peer, down); 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; } 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->stale && (u->conf->use_stale & ft_type)) { ngx_http_upstream_finalize_request(r, u, ngx_http_send_cached_response(r)); 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) { ngx_http_upstream_ssl_shutdown(u->peer.connection, &u->peer.peers->peer[u->peer.cur_peer]); } #endif 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_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "cleanup http upstream request: \"%V\"", &r->uri); ngx_http_upstream_finalize_request(r, r->upstream, 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); *u->cleanup = NULL; if (u->state->response_time) { tp = ngx_timeofday(); u->state->response_time = tp->sec * 1000 + tp->msec - u->state->response_time; } u->finalize_request(r, rc); 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) /* TODO: do not shutdown persistent connection */ if (u->peer.connection->ssl) { ngx_http_upstream_ssl_shutdown(u->peer.connection, &u->peer.peers->peer[u->peer.cur_peer]); } #endif ngx_close_connection(u->peer.connection); } u->peer.connection = NULL; if (u->header_sent && (rc == NGX_ERROR || rc >= NGX_HTTP_SPECIAL_RESPONSE)) { rc = 0; } 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 0 if (u->cache) { ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "http upstream cache fd: %d", u->cache->ctx.file.fd); } #endif if (rc == NGX_DECLINED) { return; } r->connection->log->action = "sending to client"; if (rc == 0 && r == r->main && !r->post_action) { rc = ngx_http_send_special(r, NGX_HTTP_LAST); } ngx_http_finalize_request(r, rc); } #if (NGX_HTTP_SSL) static void ngx_http_upstream_ssl_shutdown(ngx_connection_t *c, ngx_peer_t *peer) { /* lock peer mutex */ if (peer->ssl_session) { ngx_ssl_free_session(peer->ssl_session); } peer->ssl_session = ngx_ssl_get_session(c); /* unlock peer mutex */ /* * 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. */ c->ssl->no_wait_shutdown = 1; (void) ngx_ssl_shutdown(c); } #endif 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_process_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 **ph; pa = (ngx_array_t *) ((char *) &r->upstream->headers_in + 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; } *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_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_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; for (p = h->value.data; *p; p++) { if (*p != ';') { continue; } last = p; while (*++p == ' ') { /* void */ } if (ngx_strncasecmp(p, "charset=", 8) != 0) { continue; } p += 8; r->headers_out.content_type_len = last - h->value.data; r->headers_out.charset.len = h->value.data + h->value.len - p; r->headers_out.charset.data = p; } return NGX_OK; } static ngx_int_t ngx_http_upstream_copy_content_length(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_length = ho; r->headers_out.content_length_n = ngx_atoof(h->value.data, h->value.len); 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; } /* * 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 = (u_char *) ngx_strstr(ho->value.data, "url="); 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 (NGX_DEBUG) if (rc == NGX_OK) { ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, "rewritten refresh: \"%V\"", &ho->value); } #endif return rc; } 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 size_t ngx_http_upstream_log_status_getlen(ngx_http_request_t *r, uintptr_t data) { if (r->upstream) { return r->upstream->states.nelts * (3 + 2); } return 1; } static u_char * ngx_http_upstream_log_status(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op) { ngx_uint_t i; ngx_http_upstream_t *u; ngx_http_upstream_state_t *state; u = r->upstream; if (u == NULL || u->states.nelts == 0) { *buf = '-'; return buf + 1; } i = 0; state = u->states.elts; for ( ;; ) { if (state[i].status == 0) { *buf++ = '-'; } else { buf = ngx_sprintf(buf, "%ui", state[i].status); } if (++i == u->states.nelts) { return buf; } *buf++ = ','; *buf++ = ' '; } } static size_t ngx_http_upstream_log_response_time_getlen(ngx_http_request_t *r, uintptr_t data) { if (r->upstream) { return r->upstream->states.nelts * (NGX_TIME_T_LEN + 4 + 2); } return 1; } static u_char * ngx_http_upstream_log_response_time(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op) { ngx_uint_t i; ngx_http_upstream_t *u; ngx_http_upstream_state_t *state; u = r->upstream; if (u == NULL || u->states.nelts == 0) { *buf = '-'; return buf + 1; } i = 0; state = u->states.elts; for ( ;; ) { if (state[i].status == 0) { *buf++ = '-'; } else { buf = ngx_sprintf(buf, "%d.%03d", state[i].response_time / 1000, state[i].response_time % 1000); } if (++i == u->states.nelts) { return buf; } *buf++ = ','; *buf++ = ' '; } } static ngx_int_t ngx_http_upstream_add_variables(ngx_conf_t *cf) { ngx_http_variable_t *var, *v; ngx_http_log_op_name_t *op; 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; } for (op = ngx_http_upstream_log_fmt_ops; op->name.len; op++) { /* void */ } op->run = NULL; for (op = ngx_http_log_fmt_ops; op->run; op++) { if (op->name.len == 0) { op = (ngx_http_log_op_name_t *) op->run; } } op->run = (ngx_http_log_op_run_pt) ngx_http_upstream_log_fmt_ops; 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_t *u; ngx_http_upstream_state_t *state; v->valid = 1; v->no_cachable = 0; v->not_found = 0; u = r->upstream; if (u == NULL || u->states.nelts == 0) { v->not_found = 1; return NGX_OK; } len = u->states.nelts * (3 + 2); p = ngx_palloc(r->pool, len); if (p == NULL) { return NGX_ERROR; } v->data = p; i = 0; state = u->states.elts; for ( ;; ) { if (state[i].status == 0) { *p++ = '-'; } else { p = ngx_sprintf(p, "%ui", state[i].status); } if (++i == u->states.nelts) { break; } *p++ = ','; *p++ = ' '; } 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_http_upstream_t *u; ngx_http_upstream_state_t *state; v->valid = 1; v->no_cachable = 0; v->not_found = 0; u = r->upstream; if (u == NULL || u->states.nelts == 0) { v->not_found = 1; return NGX_OK; } len = u->states.nelts * (NGX_TIME_T_LEN + 4 + 2); p = ngx_palloc(r->pool, len); if (p == NULL) { return NGX_ERROR; } v->data = p; i = 0; state = u->states.elts; for ( ;; ) { if (state[i].status == 0) { *p++ = '-'; } else { p = ngx_sprintf(p, "%d.%03d", state[i].response_time / 1000, state[i].response_time % 1000); } if (++i == u->states.nelts) { break; } *p++ = ','; *p++ = ' '; } v->len = p - v->data; return NGX_OK; } 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 i, j, m, n; ngx_conf_t pcf; ngx_peers_t **peers; ngx_http_module_t *module; ngx_http_conf_ctx_t *ctx; ngx_http_upstream_srv_conf_t *uscf; ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_conf_ctx_t)); if (ctx == NULL) { return NGX_CONF_ERROR; } ngx_memzero(&u, sizeof(ngx_url_t)); value = cf->args->elts; u.host = value[1]; uscf = ngx_http_upstream_add(cf, &u); if (uscf == NULL) { return NGX_CONF_ERROR; } /* 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; /* 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_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; } peers = uscf->servers->elts; if (uscf->servers->nelts == 1) { uscf->peers = peers[0]; } n = 0; for (i = 0; i < uscf->servers->nelts; i++) { n += peers[i]->number; } uscf->peers = ngx_pcalloc(cf->pool, sizeof(ngx_peers_t) + sizeof(ngx_peer_t) * (n - 1)); if (uscf->peers == NULL) { return NGX_CONF_ERROR; } uscf->peers->number = n; n = 0; for (i = 0; i < uscf->servers->nelts; i++) { for (j = 0; j < peers[i]->number; j++) { uscf->peers->peer[n++] = peers[i]->peer[j]; } } 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; ngx_str_t *value; ngx_url_t u; ngx_int_t weight; ngx_uint_t i; ngx_peers_t **peers; if (uscf->servers == NULL) { uscf->servers = ngx_array_create(cf->pool, 4, sizeof(ngx_peers_t *)); if (uscf->servers == NULL) { return NGX_CONF_ERROR; } } peers = ngx_array_push(uscf->servers); if (peers == NULL) { return NGX_CONF_ERROR; } value = cf->args->elts; ngx_memzero(&u, sizeof(ngx_url_t)); u.url = value[1]; u.default_portn = 80; if (ngx_parse_url(cf, &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; if (cf->args->nelts == 3) { value = &value[2]; if (ngx_strncmp(value->data, "weight=", 7) == 0) { weight = ngx_atoi(&value->data[7], value->len - 7); if (weight == NGX_ERROR || weight == 0) { goto invalid; } } else { goto invalid; } } for (i = 0; i < u.peers->number; i++) { u.peers->peer[i].weight = weight; u.peers->peer[i].current_weight = weight; u.peers->peer[i].max_fails = NGX_CONF_UNSET_UINT; u.peers->peer[i].fail_timeout = NGX_CONF_UNSET; } *peers = u.peers; return NGX_CONF_OK; invalid: ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", value); 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 i; ngx_http_upstream_srv_conf_t *uscf, **uscfp; ngx_http_upstream_main_conf_t *umcf; if (u->upstream) { if (ngx_parse_url(cf, 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; } if (u->peers) { uscf = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_srv_conf_t)); if (uscf == NULL) { return NULL; } uscf->peers = u->peers; return uscf; } } 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) { continue; } if (ngx_strncasecmp(uscfp[i]->host.data, u->host.data, u->host.len) == 0) { return uscfp[i]; } } uscf = ngx_pcalloc(cf->pool, sizeof(ngx_http_upstream_srv_conf_t)); if (uscf == NULL) { return NULL; } uscf->host = u->host; uscf->file_name = cf->conf_file->file.name; uscf->line = cf->conf_file->line; uscf->port = u->default_portn; uscfp = ngx_array_push(&umcf->upstreams); if (uscfp == NULL) { return NULL; } *uscfp = uscf; return uscf; } 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 NGX_CONF_ERROR; } 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_header_t *header; ngx_http_upstream_srv_conf_t **uscfp; uscfp = umcf->upstreams.elts; for (i = 0; i < umcf->upstreams.nelts; i++) { if (uscfp[i]->peers) { continue; } uscfp[i]->peers = ngx_inet_resolve_peer(cf, &uscfp[i]->host, uscfp[i]->port); if (uscfp[i]->peers == NULL) { return NGX_CONF_ERROR; } if (uscfp[i]->peers == NGX_CONF_ERROR) { ngx_log_error(NGX_LOG_EMERG, cf->log, 0, "upstream host \"%V\" is not found in %s:%ui", &uscfp[i]->host, uscfp[i]->file_name.data, uscfp[i]->line); return NGX_CONF_ERROR; } } 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_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; }