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Mail: fixed handling of blocked client read events in proxy. 

When establishing a connection to the backend, nginx blocks reading
from the client with ngx_mail_proxy_block_read().  Previously, such
events were lost, and in some cases this resulted in connection hangs.

Notably, this affected mail_imap_ssl.t on Windows, since the test
closes connections after requesting authentication, but without
waiting for any responses (so the connection close events might be
lost).

Fix is to post an event to read from the client after connecting to
the backend if there were blocked events.
This commit is contained in:
Maxim Dounin 2023-03-24 02:53:21 +03:00
parent 4d05ba0272
commit 23958e4a5c
1 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/mail/ngx_mail_proxy_module.c
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@ -327,7 +327,9 @@ ngx_mail_proxy_pop3_handler(ngx_event_t *rev)
c->log->action = NULL;
ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
if (s->buffer->pos < s->buffer->last) {
if (s->buffer->pos < s->buffer->last
|| s->connection->read->ready)
{
ngx_post_event(c->write, &ngx_posted_events);
}
@ -486,7 +488,9 @@ ngx_mail_proxy_imap_handler(ngx_event_t *rev)
c->log->action = NULL;
ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
if (s->buffer->pos < s->buffer->last) {
if (s->buffer->pos < s->buffer->last
|| s->connection->read->ready)
{
ngx_post_event(c->write, &ngx_posted_events);
}
@ -821,7 +825,9 @@ ngx_mail_proxy_smtp_handler(ngx_event_t *rev)
c->log->action = NULL;
ngx_log_error(NGX_LOG_INFO, c->log, 0, "client logged in");
if (s->buffer->pos < s->buffer->last) {
if (s->buffer->pos < s->buffer->last
|| s->connection->read->ready)
{
ngx_post_event(c->write, &ngx_posted_events);
}