Mercurial > hg > nginx
view src/mail/ngx_mail_ssl_module.h @ 7951:c7a8bdf5af55
Changed ngx_chain_update_chains() to test tag first (ticket #2248).
Without this change, aio used with HTTP/2 can result in connection hang,
as observed with "aio threads; aio_write on;" and proxying (ticket #2248).
The problem is that HTTP/2 updates buffers outside of the output filters
(notably, marks them as sent), and then posts a write event to call
output filters. If a filter does not call the next one for some reason
(for example, because of an AIO operation in progress), this might
result in a state when the owner of a buffer already called
ngx_chain_update_chains() and can reuse the buffer, while the same buffer
is still sitting in the busy chain of some other filter.
In the particular case a buffer was sitting in output chain's ctx->busy,
and was reused by event pipe. Output chain's ctx->busy was permanently
blocked by it, and this resulted in connection hang.
Fix is to change ngx_chain_update_chains() to skip buffers from other
modules unconditionally, without trying to wait for these buffers to
become empty.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Sat, 30 Oct 2021 02:39:19 +0300 |
parents | 3bff3f397c05 |
children | 0aaa09927703 |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_MAIL_SSL_H_INCLUDED_ #define _NGX_MAIL_SSL_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_mail.h> #define NGX_MAIL_STARTTLS_OFF 0 #define NGX_MAIL_STARTTLS_ON 1 #define NGX_MAIL_STARTTLS_ONLY 2 typedef struct { ngx_flag_t enable; ngx_flag_t prefer_server_ciphers; ngx_ssl_t ssl; ngx_uint_t starttls; ngx_uint_t listen; ngx_uint_t protocols; ngx_uint_t verify; ngx_uint_t verify_depth; ssize_t builtin_session_cache; time_t session_timeout; ngx_array_t *certificates; ngx_array_t *certificate_keys; ngx_str_t dhparam; ngx_str_t ecdh_curve; ngx_str_t client_certificate; ngx_str_t trusted_certificate; ngx_str_t crl; ngx_str_t ciphers; ngx_array_t *passwords; ngx_array_t *conf_commands; ngx_shm_zone_t *shm_zone; ngx_flag_t session_tickets; ngx_array_t *session_ticket_keys; u_char *file; ngx_uint_t line; } ngx_mail_ssl_conf_t; extern ngx_module_t ngx_mail_ssl_module; #endif /* _NGX_MAIL_SSL_H_INCLUDED_ */