From 4056ce4f4ee4d80d41c56af8c1b4fd41b76144c8 Mon Sep 17 00:00:00 2001 From: Maxim Dounin Date: Mon, 25 May 2020 18:33:42 +0300 Subject: [PATCH] HTTP/2: invalid connection preface logging (ticket #1981). Previously, invalid connection preface errors were only logged at debug level, providing no visible feedback, in particular, when a plain text HTTP/2 listening socket is erroneously used for HTTP/1.x connections. Now these are explicitly logged at the info level, much like other client-related errors. --- src/http/v2/ngx_http_v2.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/src/http/v2/ngx_http_v2.c b/src/http/v2/ngx_http_v2.c index 8b0fc53b0..08d66c97b 100644 --- a/src/http/v2/ngx_http_v2.c +++ b/src/http/v2/ngx_http_v2.c @@ -731,9 +731,8 @@ ngx_http_v2_state_preface(ngx_http_v2_connection_t *h2c, u_char *pos, } if (ngx_memcmp(pos, preface, sizeof(preface) - 1) != 0) { - ngx_log_debug2(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0, - "invalid http2 connection preface \"%*s\"", - sizeof(preface) - 1, pos); + ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0, + "invalid connection preface"); return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_PROTOCOL_ERROR); } @@ -754,9 +753,8 @@ ngx_http_v2_state_preface_end(ngx_http_v2_connection_t *h2c, u_char *pos, } if (ngx_memcmp(pos, preface, sizeof(preface) - 1) != 0) { - ngx_log_debug2(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0, - "invalid http2 connection preface \"%*s\"", - sizeof(preface) - 1, pos); + ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0, + "invalid connection preface"); return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_PROTOCOL_ERROR); }