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lib: provide a getaddrinfo wrapper

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This uses c-ares under the hood and supports the CURL_DNS_SERVER
environment variable - for debug builds only. The getaddrinfo()
replacement function is only used if CURL_DNS_SERVER is set to make a
debug build work more like a release version without the variable set.

'override-dns' is a new feature for the test suite when curl can be told
to use a dedicated DNS server, and test 2102 is the first to require
this.

Requires c-ares 1.26.0 or later.

Closes #17134
This commit is contained in:
Daniel Stenberg 2025-04-22 14:51:49 +02:00
parent da33c1e349
commit e0ebc3ff13
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8 changed files with 335 additions and 11 deletions
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10
src/curlinfo.c
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@ -35,6 +35,8 @@
#include "multihandle.h" /* for ENABLE_WAKEUP */
#include "tool_xattr.h" /* for USE_XATTR */
#include "curl_sha512_256.h" /* for CURL_HAVE_SHA512_256 */
#include "asyn.h" /* for CURLRES_ARES */
#include "fake_addrinfo.h" /* for USE_FAKE_GETADDRINFO */
#include <stdio.h>
static const char *disabled[]={
@ -225,6 +227,14 @@ static const char *disabled[]={
"OFF"
#else
"ON"
#endif
,
"override-dns: "
#if defined(CURLDEBUG) && \
(defined(CURLRES_ARES) || defined(USE_FAKE_GETADDRINFO))
"ON"
#else
"OFF"
#endif
,
NULL