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openssl: check SSL_write() length on retries

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When an SSL_write() blocks we need to retry it with the
same length as before or stupid OpenSSL freaks out. Remember
it, limit any longer sends and fail shorter ones.

Fixes #18121
Reported-by: adamse on github
Closes #18132
This commit is contained in:
Stefan Eissing 2025-08-01 14:55:52 +02:00 • committed by Daniel Stenberg
parent 8df0a5ba32
commit ec4c559104
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4 changed files with 33 additions and 6 deletions
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13
tests/http/test_02_download.py
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@ -754,7 +754,7 @@ class TestDownload:
# download with looong urls
@pytest.mark.parametrize("proto", ['http/1.1', 'h2', 'h3'])
@pytest.mark.parametrize("url_junk", [1024, 16*1024, 32*1024, 64*1024])
@pytest.mark.parametrize("url_junk", [1024, 16*1024, 32*1024, 64*1024, 80*1024, 96*1024])
def test_02_36_looong_urls(self, env: Env, httpd, nghttpx, proto, url_junk):
if proto == 'h3' and not env.have_h3():
pytest.skip("h3 not supported")
@ -784,6 +784,11 @@ class TestDownload:
# h2 is unable to send such large headers (frame limits)
r.check_exit_code(55)
elif proto == 'h3':
r.check_exit_code(0)
# nghttpx reports 431 Request Header Field too Large
r.check_response(http_status=431)
if url_junk <= 64*1024:
r.check_exit_code(0)
# nghttpx reports 431 Request Header Field too Large
r.check_response(http_status=431)
else:
# nghttpx destroys the connection with internal error
# ERR_QPACK_HEADER_TOO_LARGE
r.check_exit_code(56)