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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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GPG key ID: 5CC908FDB71E12C2
8 changed files with 335 additions and 11 deletions
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24
lib/curl_addrinfo.c
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@ -50,6 +50,7 @@
#include <stddef.h>
#include "curl_addrinfo.h"
#include "fake_addrinfo.h"
#include "inet_pton.h"
#include "warnless.h"
/* The last 3 #include files should be in this order */
@ -508,6 +509,14 @@ curl_dbg_freeaddrinfo(struct addrinfo *freethis,
source, line, (void *)freethis);
#ifdef USE_LWIPSOCK
lwip_freeaddrinfo(freethis);
#elif defined(USE_FAKE_GETADDRINFO)
{
const char *env = getenv("CURL_DNS_SERVER");
if(env)
r_freeaddrinfo(freethis);
else
freeaddrinfo(freethis);
}
#else
freeaddrinfo(freethis);
#endif
@ -526,13 +535,20 @@ curl_dbg_freeaddrinfo(struct addrinfo *freethis,
int
curl_dbg_getaddrinfo(const char *hostname,
const char *service,
const struct addrinfo *hints,
struct addrinfo **result,
int line, const char *source)
const char *service,
const struct addrinfo *hints,
struct addrinfo **result,
int line, const char *source)
{
#ifdef USE_LWIPSOCK
int res = lwip_getaddrinfo(hostname, service, hints, result);
#elif defined(USE_FAKE_GETADDRINFO)
int res;
const char *env = getenv("CURL_DNS_SERVER");
if(env)
res = r_getaddrinfo(hostname, service, hints, result);
else
res = getaddrinfo(hostname, service, hints, result);
#else
int res = getaddrinfo(hostname, service, hints, result);
#endif