Mercurial > hg > nginx-quic
view src/stream/ngx_stream_handler.c @ 7385:1c6b6163c039 stable-1.14
HTTP/2: flood detection.
Fixed uncontrolled memory growth in case peer is flooding us with
some frames (e.g., SETTINGS and PING) and doesn't read data. Fix
is to limit the number of allocated control frames.
author | Ruslan Ermilov <ru@nginx.com> |
---|---|
date | Tue, 06 Nov 2018 16:29:35 +0300 |
parents | 3908156a51fa |
children | 893b3313f53c |
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/* * Copyright (C) Roman Arutyunyan * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_event.h> #include <ngx_stream.h> static void ngx_stream_log_session(ngx_stream_session_t *s); static void ngx_stream_close_connection(ngx_connection_t *c); static u_char *ngx_stream_log_error(ngx_log_t *log, u_char *buf, size_t len); static void ngx_stream_proxy_protocol_handler(ngx_event_t *rev); void ngx_stream_init_connection(ngx_connection_t *c) { u_char text[NGX_SOCKADDR_STRLEN]; size_t len; ngx_uint_t i; ngx_time_t *tp; ngx_event_t *rev; struct sockaddr *sa; ngx_stream_port_t *port; struct sockaddr_in *sin; ngx_stream_in_addr_t *addr; ngx_stream_session_t *s; ngx_stream_addr_conf_t *addr_conf; #if (NGX_HAVE_INET6) struct sockaddr_in6 *sin6; ngx_stream_in6_addr_t *addr6; #endif ngx_stream_core_srv_conf_t *cscf; ngx_stream_core_main_conf_t *cmcf; /* find the server configuration for the address:port */ port = c->listening->servers; if (port->naddrs > 1) { /* * There are several addresses on this port and one of them * is the "*:port" wildcard so getsockname() is needed to determine * the server address. * * AcceptEx() and recvmsg() already gave this address. */ if (ngx_connection_local_sockaddr(c, NULL, 0) != NGX_OK) { ngx_stream_close_connection(c); return; } sa = c->local_sockaddr; switch (sa->sa_family) { #if (NGX_HAVE_INET6) case AF_INET6: sin6 = (struct sockaddr_in6 *) sa; addr6 = port->addrs; /* the last address is "*" */ for (i = 0; i < port->naddrs - 1; i++) { if (ngx_memcmp(&addr6[i].addr6, &sin6->sin6_addr, 16) == 0) { break; } } addr_conf = &addr6[i].conf; break; #endif default: /* AF_INET */ sin = (struct sockaddr_in *) sa; addr = port->addrs; /* the last address is "*" */ for (i = 0; i < port->naddrs - 1; i++) { if (addr[i].addr == sin->sin_addr.s_addr) { break; } } addr_conf = &addr[i].conf; break; } } else { switch (c->local_sockaddr->sa_family) { #if (NGX_HAVE_INET6) case AF_INET6: addr6 = port->addrs; addr_conf = &addr6[0].conf; break; #endif default: /* AF_INET */ addr = port->addrs; addr_conf = &addr[0].conf; break; } } s = ngx_pcalloc(c->pool, sizeof(ngx_stream_session_t)); if (s == NULL) { ngx_stream_close_connection(c); return; } s->signature = NGX_STREAM_MODULE; s->main_conf = addr_conf->ctx->main_conf; s->srv_conf = addr_conf->ctx->srv_conf; #if (NGX_STREAM_SSL) s->ssl = addr_conf->ssl; #endif if (c->buffer) { s->received += c->buffer->last - c->buffer->pos; } s->connection = c; c->data = s; cscf = ngx_stream_get_module_srv_conf(s, ngx_stream_core_module); ngx_set_connection_log(c, cscf->error_log); len = ngx_sock_ntop(c->sockaddr, c->socklen, text, NGX_SOCKADDR_STRLEN, 1); ngx_log_error(NGX_LOG_INFO, c->log, 0, "*%uA %sclient %*s connected to %V", c->number, c->type == SOCK_DGRAM ? "udp " : "", len, text, &addr_conf->addr_text); c->log->connection = c->number; c->log->handler = ngx_stream_log_error; c->log->data = s; c->log->action = "initializing session"; c->log_error = NGX_ERROR_INFO; s->ctx = ngx_pcalloc(c->pool, sizeof(void *) * ngx_stream_max_module); if (s->ctx == NULL) { ngx_stream_close_connection(c); return; } cmcf = ngx_stream_get_module_main_conf(s, ngx_stream_core_module); s->variables = ngx_pcalloc(s->connection->pool, cmcf->variables.nelts * sizeof(ngx_stream_variable_value_t)); if (s->variables == NULL) { ngx_stream_close_connection(c); return; } tp = ngx_timeofday(); s->start_sec = tp->sec; s->start_msec = tp->msec; rev = c->read; rev->handler = ngx_stream_session_handler; if (addr_conf->proxy_protocol) { c->log->action = "reading PROXY protocol"; rev->handler = ngx_stream_proxy_protocol_handler; if (!rev->ready) { ngx_add_timer(rev, cscf->proxy_protocol_timeout); if (ngx_handle_read_event(rev, 0) != NGX_OK) { ngx_stream_finalize_session(s, NGX_STREAM_INTERNAL_SERVER_ERROR); } return; } } if (ngx_use_accept_mutex) { ngx_post_event(rev, &ngx_posted_events); return; } rev->handler(rev); } static void ngx_stream_proxy_protocol_handler(ngx_event_t *rev) { u_char *p, buf[NGX_PROXY_PROTOCOL_MAX_HEADER]; size_t size; ssize_t n; ngx_err_t err; ngx_connection_t *c; ngx_stream_session_t *s; ngx_stream_core_srv_conf_t *cscf; c = rev->data; s = c->data; ngx_log_debug0(NGX_LOG_DEBUG_STREAM, c->log, 0, "stream PROXY protocol handler"); if (rev->timedout) { ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out"); ngx_stream_finalize_session(s, NGX_STREAM_OK); return; } n = recv(c->fd, (char *) buf, sizeof(buf), MSG_PEEK); err = ngx_socket_errno; ngx_log_debug1(NGX_LOG_DEBUG_STREAM, c->log, 0, "recv(): %z", n); if (n == -1) { if (err == NGX_EAGAIN) { rev->ready = 0; if (!rev->timer_set) { cscf = ngx_stream_get_module_srv_conf(s, ngx_stream_core_module); ngx_add_timer(rev, cscf->proxy_protocol_timeout); } if (ngx_handle_read_event(rev, 0) != NGX_OK) { ngx_stream_finalize_session(s, NGX_STREAM_INTERNAL_SERVER_ERROR); } return; } ngx_connection_error(c, err, "recv() failed"); ngx_stream_finalize_session(s, NGX_STREAM_OK); return; } if (rev->timer_set) { ngx_del_timer(rev); } p = ngx_proxy_protocol_read(c, buf, buf + n); if (p == NULL) { ngx_stream_finalize_session(s, NGX_STREAM_BAD_REQUEST); return; } size = p - buf; if (c->recv(c, buf, size) != (ssize_t) size) { ngx_stream_finalize_session(s, NGX_STREAM_INTERNAL_SERVER_ERROR); return; } c->log->action = "initializing session"; ngx_stream_session_handler(rev); } void ngx_stream_session_handler(ngx_event_t *rev) { ngx_connection_t *c; ngx_stream_session_t *s; c = rev->data; s = c->data; ngx_stream_core_run_phases(s); } void ngx_stream_finalize_session(ngx_stream_session_t *s, ngx_uint_t rc) { ngx_log_debug1(NGX_LOG_DEBUG_STREAM, s->connection->log, 0, "finalize stream session: %i", rc); s->status = rc; ngx_stream_log_session(s); ngx_stream_close_connection(s->connection); } static void ngx_stream_log_session(ngx_stream_session_t *s) { ngx_uint_t i, n; ngx_stream_handler_pt *log_handler; ngx_stream_core_main_conf_t *cmcf; cmcf = ngx_stream_get_module_main_conf(s, ngx_stream_core_module); log_handler = cmcf->phases[NGX_STREAM_LOG_PHASE].handlers.elts; n = cmcf->phases[NGX_STREAM_LOG_PHASE].handlers.nelts; for (i = 0; i < n; i++) { log_handler[i](s); } } static void ngx_stream_close_connection(ngx_connection_t *c) { ngx_pool_t *pool; ngx_log_debug1(NGX_LOG_DEBUG_STREAM, c->log, 0, "close stream connection: %d", c->fd); #if (NGX_STREAM_SSL) if (c->ssl) { if (ngx_ssl_shutdown(c) == NGX_AGAIN) { c->ssl->handler = ngx_stream_close_connection; return; } } #endif #if (NGX_STAT_STUB) (void) ngx_atomic_fetch_add(ngx_stat_active, -1); #endif pool = c->pool; ngx_close_connection(c); ngx_destroy_pool(pool); } static u_char * ngx_stream_log_error(ngx_log_t *log, u_char *buf, size_t len) { u_char *p; ngx_stream_session_t *s; if (log->action) { p = ngx_snprintf(buf, len, " while %s", log->action); len -= p - buf; buf = p; } s = log->data; p = ngx_snprintf(buf, len, ", %sclient: %V, server: %V", s->connection->type == SOCK_DGRAM ? "udp " : "", &s->connection->addr_text, &s->connection->listening->addr_text); len -= p - buf; buf = p; if (s->log_handler) { p = s->log_handler(log, buf, len); } return p; }