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asyn resolver code improvements

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"asyn" is the internal name under which both c-ares and threaded
resolver operate. Make the naming more consistent. Implement the c-ares
resolver in `asyn-ares.*` and the threaded resolver in `asyn-thrdd.*`.
The common functions are in `asyn-base.c`.

When `CURLRES_ASYNCH` is defined, either of the two is used and
`data->state.async` exists. Members of that struct vary for the selected
implementation, but have the fields `hostname`, `port` and `ip_version`
always present. This are populated when the async resolving starts and
eliminate the need to pass them again when checking on the status and
processing the results of the resolving.

Add a `Curl_resolv_blocking()` to `hostip.h` that relieves FTP and SOCKS
from having to repeat the same code.

`Curl_resolv_check()` remains the function to check for status of
ongoing resolving. Now it also performs internally the check if the
needed DNS entry exists in the dnscache and if so, aborts the asnyc
operation. (libcurl right now does not check for duplicate resolve
attempts. an area for future improvements).

The number of functions in `asyn.h` has been reduced. There were subtle
difference in "cancel()" and "kill()" calls, both replaced by
`Curl_async_shutdown()` now. This changes behaviour for threaded
resolver insofar as the resolving thread is now always joined unless
`data->set.quick_exit` is set. Before this was only done on some code
paths. A future improvement would be a thread pool that keeps a limit
and also could handle joins more gracefully.

DoH, not previously tagged under "asny", has its struct `doh_probes` now
also in `data->state.async`, moved there from `data->req` because it
makes more sense. Further integration of DoH underneath the "asyn"
umbrella seems like a good idea.

Closes #16963
This commit is contained in:
Stefan Eissing 2025-04-11 14:43:45 +02:00 • committed by Daniel Stenberg
parent be718daf99
commit 56e40ae6a5
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30 changed files with 1902 additions and 2134 deletions
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17
lib/cf-socket.c
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@ -674,21 +674,14 @@ static CURLcode bindlocal(struct Curl_easy *data, struct connectdata *conn,
* of the connection. The resolve functions should really be changed
* to take a type parameter instead.
*/
unsigned char ipver = conn->ip_version;
int rc;
if(af == AF_INET)
conn->ip_version = CURL_IPRESOLVE_V4;
int ip_version = (af == AF_INET) ?
CURL_IPRESOLVE_V4 : CURL_IPRESOLVE_WHATEVER;
#ifdef USE_IPV6
else if(af == AF_INET6)
conn->ip_version = CURL_IPRESOLVE_V6;
if(af == AF_INET6)
ip_version = CURL_IPRESOLVE_V6;
#endif
rc = Curl_resolv(data, host, 80, FALSE, &h);
if(rc == CURLRESOLV_PENDING)
(void)Curl_resolver_wait_resolv(data, &h);
conn->ip_version = ipver;
(void)Curl_resolv_blocking(data, host, 80, ip_version, &h);
if(h) {
int h_af = h->addr->ai_family;
/* convert the resolved address, sizeof myhost >= INET_ADDRSTRLEN */