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lib: connection filters (cfilter) addition to curl:

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- general construct/destroy in connectdata
 - default implementations of callback functions
 - connect: cfilters for connect and accept
 - socks: cfilter for socks proxying
 - http_proxy: cfilter for http proxy tunneling
 - vtls: cfilters for primary and proxy ssl
 - change in general handling of data/conn
 - Curl_cfilter_setup() sets up filter chain based on data settings,
   if none are installed by the protocol handler setup
 - Curl_cfilter_connect() boot straps filters into `connected` status,
   used by handlers and multi to reach further stages
 - Curl_cfilter_is_connected() to check if a conn is connected,
   e.g. all filters have done their work
 - Curl_cfilter_get_select_socks() gets the sockets and READ/WRITE
   indicators for multi select to work
 - Curl_cfilter_data_pending() asks filters if the have incoming
   data pending for recv
 - Curl_cfilter_recv()/Curl_cfilter_send are the general callbacks
   installed in conn->recv/conn->send for io handling
 - Curl_cfilter_attach_data()/Curl_cfilter_detach_data() inform filters
   and addition/removal of a `data` from their connection
 - adding vtl functions to prevent use of Curl_ssl globals directly
   in other parts of the code.

Reviewed-by: Daniel Stenberg
Closes #9855
This commit is contained in:
Stefan Eissing 2022-11-11 11:45:34 +01:00 • committed by Daniel Stenberg
parent 89ee5cfb38
commit dafdb20a26
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GPG key ID: 5CC908FDB71E12C2
49 changed files with 3325 additions and 1969 deletions
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9
lib/telnet.c
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@ -1491,6 +1491,7 @@ static CURLcode telnet_do(struct Curl_easy *data, bool *done)
}
while(keepon) {
DEBUGF(infof(data, "telnet_do(handle=%p), poll %d fds", data, poll_cnt));
switch(Curl_poll(pfd, poll_cnt, interval_ms)) {
case -1: /* error, stop reading */
keepon = FALSE;
@ -1509,6 +1510,14 @@ static CURLcode telnet_do(struct Curl_easy *data, bool *done)
/* returned not-zero, this an error */
if(result) {
keepon = FALSE;
/* TODO: in test 1452, macOS sees a ECONNRESET sometimes?
* Is this the telnet test server not shutting down the socket
* in a clean way? Seems to be timing related, happens more
* on slow debug build */
if(data->state.os_errno == ECONNRESET) {
DEBUGF(infof(data, "telnet_do(handle=%p), unexpected ECONNRESET"
" on recv", data));
}
break;
}
/* returned zero but actually received 0 or less here,