/* * Copyright (C) Igor Sysoev */ #include #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_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_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_copy_header_line(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset); static ngx_int_t ngx_http_upstream_conditional_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 u_char *ngx_http_upstream_log_response_time(ngx_http_request_t *r, u_char *buf, ngx_http_log_op_t *op); static u_char *ngx_http_upstream_log_error(ngx_http_request_t *r, u_char *buf, size_t len); static ngx_int_t ngx_http_upstream_add_log_formats(ngx_conf_t *cf); static void *ngx_http_upstream_create_main_conf(ngx_conf_t *cf); static char *ngx_http_core_init_main_conf(ngx_conf_t *cf, void *conf); 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), /* STUB */ ngx_http_upstream_ignore_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, 0 }, { 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_conditional_copy_header_line, offsetof(ngx_http_upstream_conf_t, pass_date), 0 }, { ngx_string("Server"), ngx_http_upstream_process_header_line, offsetof(ngx_http_upstream_headers_in_t, server), ngx_http_upstream_conditional_copy_header_line, offsetof(ngx_http_upstream_conf_t, pass_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("Connection"), ngx_http_upstream_ignore_header_line, 0, ngx_http_upstream_ignore_header_line, 0, 0 }, { ngx_string("X-Pad"), 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_conditional_copy_header_line, offsetof(ngx_http_upstream_conf_t, pass_x_powered_by), 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_conditional_copy_header_line, offsetof(ngx_http_upstream_conf_t, pass_x_accel_expires), 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 }, #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 } }; ngx_http_module_t ngx_http_upstream_module_ctx = { ngx_http_upstream_add_log_formats, /* preconfiguration */ NULL, /* postconfiguration */ ngx_http_upstream_create_main_conf, /* create main configuration */ ngx_http_core_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 */ NULL, /* 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"), NGX_TIME_T_LEN + 4, NULL, NULL, ngx_http_upstream_log_response_time }, { ngx_null_string, 0, NULL, NULL, NULL } }; char *ngx_http_upstream_header_errors[] = { "upstream sent invalid header", "upstream sent too long header line" }; void ngx_http_upstream_init(ngx_http_request_t *r) { ngx_time_t *tp; ngx_connection_t *c; 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); } 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; } } } u = r->upstream; 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; u->saved_log_handler = r->log_handler; r->log_handler = ngx_http_upstream_log_error; 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; } u->state = ngx_array_push(&u->states); if (u->state == NULL) { ngx_http_finalize_request(r, 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; 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->closed) { 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->closed = 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->closed = 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_connection_t *c; r->connection->log->action = "connecting to upstream"; r->connection->single_connection = 0; 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; } 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) { if (r->request_body->temp_file && r->main == r) { /* * 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; } /* rc == NGX_OK */ ngx_http_upstream_send_request(r, u); } 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) { if (r->request_body->temp_file && r->main != r && 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->header_in buffer */ #if 0 if (u->cache) { u->header_in.pos = u->header_in.start + u->cache->ctx.header_size; u->header_in.last = u->header_in.pos; } else { u->header_in.pos = u->header_in.start; u->header_in.last = u->header_in.start; } #else u->header_in.pos = u->header_in.start; u->header_in.last = u->header_in.start; #endif /* add one more state */ u->state = ngx_array_push(&u->states); if (u->state == NULL) { return NGX_ERROR; } ngx_memzero(u->state, sizeof(ngx_http_upstream_state_t)); return NGX_OK; } static void ngx_http_upstream_send_request(ngx_http_request_t *r, ngx_http_upstream_t *u) { int rc; ngx_connection_t *c; c = u->peer.connection; ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http upstream send request"); #if (NGX_HAVE_KQUEUE) if ((ngx_event_flags & NGX_USE_KQUEUE_EVENT) && !u->request_sent && 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; } #endif 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; return; } 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) { c->log->action = "sending request to upstream"; ngx_http_upstream_next(r, u, NGX_HTTP_UPSTREAM_FT_TIMEOUT); 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_uint_t i, key; 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->header_in.start == NULL) { u->header_in.start = ngx_palloc(r->pool, u->conf->header_buffer_size); if (u->header_in.start == NULL) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } u->header_in.pos = u->header_in.start; u->header_in.last = u->header_in.start; u->header_in.end = u->header_in.start + u->conf->header_buffer_size; u->header_in.temporary = 1; u->header_in.tag = u->output.tag; if (ngx_list_init(&r->upstream->headers_in.headers, r->pool, 8, sizeof(ngx_table_elt_t)) == NGX_ERROR) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } #if 0 if (u->cache) { u->header_in.pos += u->cache->ctx.header_size; u->header_in.last = u->header_in.pos; } #endif } n = ngx_recv(u->peer.connection, u->header_in.last, u->header_in.end - u->header_in.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->header_in.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->header_in.pos == u->header_in.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 && 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->headers_in.status_n >= NGX_HTTP_BAD_REQUEST && u->conf->redirect_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); hh = (ngx_http_upstream_header_t *) umcf->headers_in_hash.buckets; 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; } key = h[i].hash % umcf->headers_in_hash.hash_size; if (hh[key].redirect && hh[key].name.len == h[i].key.len && ngx_strcasecmp(hh[key].name.data, h[i].key.data) == 0) { if (hh[key].copy_handler(r, &h[i], hh[key].conf) != NGX_OK) { ngx_http_upstream_finalize_request(r, u, NGX_HTTP_INTERNAL_SERVER_ERROR); return; } } } ngx_http_internal_redirect(r, &r->upstream->headers_in.x_accel_redirect->value, NULL); 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) { ngx_int_t rc; ngx_uint_t i, key; ngx_list_part_t *part; ngx_table_elt_t *h; ngx_event_pipe_t *p; 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); hh = (ngx_http_upstream_header_t *) umcf->headers_in_hash.buckets; 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; } key = h[i].hash % umcf->headers_in_hash.hash_size; if (hh[key].name.len == h[i].key.len && ngx_strcasecmp(hh[key].name.data, h[i].key.data) == 0) { if (hh[key].copy_handler(r, &h[i], hh[key].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; } } r->headers_out.status = u->headers_in.status_n; r->headers_out.status_line = u->headers_in.status_line; rc = ngx_http_send_header(r); if (rc == NGX_ERROR || rc > NGX_OK) { ngx_http_upstream_finalize_request(r, u, rc); return; } u->header_sent = 1; if (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; break; } } } } /* 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, r->connection->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->header_in->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 = r->connection; p->pool = r->pool; p->log = r->connection->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 = r->connection->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->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->header_in; p->preread_bufs->next = NULL; u->header_in.recycled = 1; p->preread_size = u->header_in.last - u->header_in.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->header_in.start; p->buf_to_file->last = u->header_in.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->header_in.last += p->preread_size * as though these bytes were read */ u->header_in.last = u->header_in.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; r->connection->sendfile = 0; } else { p->cyclic_temp_file = 0; } clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module); 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_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; ngx_http_request_t *r; ngx_http_upstream_t *u; c = ev->data; r = c->data; u = r->upstream; 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) { ngx_http_upstream_finalize_request(r, u, 0); return; } } else { p->downstream_error = 1; ngx_log_error(NGX_LOG_ERR, c->log, NGX_ETIMEDOUT, "client timed out"); } } else { p->upstream_error = 1; ngx_log_error(NGX_LOG_ERR, c->log, 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) { 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->write->eof) { r->connection->closed = 1; 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); 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_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->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); 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.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 r->log_handler = u->saved_log_handler; if (rc == NGX_DECLINED) { return; } r->connection->log->action = "sending to client"; if (rc == 0 && r->main == r) { rc = ngx_http_send_last(r); } 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_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_copy_header_line(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; return NGX_OK; } static ngx_int_t ngx_http_upstream_conditional_copy_header_line(ngx_http_request_t *r, ngx_table_elt_t *h, ngx_uint_t offset) { ngx_flag_t *f; ngx_table_elt_t *ho; f = (ngx_flag_t *) ((char *) r->upstream->conf + offset); if (*f == 0) { return NGX_OK; } ho = ngx_list_push(&r->headers_out.headers); if (ho == NULL) { return NGX_ERROR; } *ho = *h; 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) { r->headers_out.content_type = h->value; 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) { *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 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) { *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 u_char * ngx_http_upstream_log_error(ngx_http_request_t *r, u_char *buf, size_t len) { u_char *p; ngx_http_upstream_t *u; ngx_peer_connection_t *peer; u = r->upstream; peer = &u->peer; p = ngx_snprintf(buf, len, ", server: %V, URL: \"%V\"," " upstream: %V%V%s%V", &r->server_name, &r->unparsed_uri, &u->conf->schema, &peer->peers->peer[peer->cur_peer].name, peer->peers->peer[peer->cur_peer].uri_separator, &u->uri); len -= p - buf; buf = p; return ngx_http_log_error_info(r, buf, len); } static ngx_int_t ngx_http_upstream_add_log_formats(ngx_conf_t *cf) { ngx_http_log_op_name_t *op; 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 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; } return umcf; } static char * ngx_http_core_init_main_conf(ngx_conf_t *cf, void *conf) { ngx_http_upstream_main_conf_t *umcf = conf; umcf->headers_in_hash.max_size = 100; umcf->headers_in_hash.bucket_limit = 1; umcf->headers_in_hash.bucket_size = sizeof(ngx_http_upstream_header_t); umcf->headers_in_hash.name = "upstream_headers_in"; if (ngx_hash_init(&umcf->headers_in_hash, cf->pool, ngx_http_upstream_headers_in, 0) != NGX_OK) { return NGX_CONF_ERROR; } ngx_log_debug2(NGX_LOG_DEBUG_HTTP, cf->log, 0, "http upstream headers_in hash size: %ui, " "max buckets per entry: %ui", umcf->headers_in_hash.hash_size, umcf->headers_in_hash.min_buckets); return NGX_CONF_OK; }