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[nginx] gRPC: RST_STREAM(NO_ERROR) handling after "trailer only" responses.

Pavel Pautov
November 19, 2020 02:18PM
details: https://hg.nginx.org/nginx/rev/88eca63261c3
changeset: 7746:88eca63261c3
user: Pavel Pautov <p.pautov@f5.com>
date: Wed Nov 18 18:41:16 2020 -0800
gRPC: RST_STREAM(NO_ERROR) handling after "trailer only" responses.

Similarly to the problem fixed in 2096b21fcd10 (ticket #1792),
when a "trailer only" gRPC response (that is, a response with the
END_STREAM flag in the HEADERS frame) was immediately followed by
RST_STREAM(NO_ERROR) in the data preread along with the response
header, RST_STREAM wasn't properly skipped and caused "upstream
rejected request with error 0" errors.
Observed with "unknown service" gRPC errors returned by grpc-go.

Fix is to set ctx->done if we are going to parse additional data,
so the RST_STREAM(NO_ERROR) is properly skipped. Additionally, now
ngx_http_grpc_filter() will complain about frames sent for closed
stream if there are any.


src/http/modules/ngx_http_grpc_module.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diffs (11 lines):

diff -r f57a478aa16d -r 88eca63261c3 src/http/modules/ngx_http_grpc_module.c
--- a/src/http/modules/ngx_http_grpc_module.c Thu Nov 19 17:15:22 2020 +0000
+++ b/src/http/modules/ngx_http_grpc_module.c Wed Nov 18 18:41:16 2020 -0800
@@ -1969,6 +1969,7 @@ ngx_http_grpc_filter_init(void *data)

u->length = 0;
+ ctx->done = 1;

} else {
u->length = 1;
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[nginx] gRPC: RST_STREAM(NO_ERROR) handling after "trailer only" responses.

Pavel Pautov 175 November 19, 2020 02:18PM

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