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libcurl: New options to bind DNS to local interfaces or IP addresses

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This commit is contained in:
Kim Vandry
2013-09-07 12:45:50 -04:00
committed by Daniel Stenberg
parent 345955e87e
commit df69440d05
9 changed files with 201 additions and 0 deletions
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61
lib/asyn-ares.c
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@@ -623,4 +623,65 @@ CURLcode Curl_set_dns_servers(struct SessionHandle *data,
#endif
return result;
}
CURLcode Curl_set_dns_interface(struct SessionHandle *data,
const char *interface)
{
#if (ARES_VERSION >= 0x010704)
if(!interface) interface = "";
ares_set_local_dev((ares_channel)data->state.resolver, interface);
return CURLE_OK;
#else /* c-ares version too old! */
(void)data;
(void)interface;
return CURLE_NOT_BUILT_IN;
#endif
}
CURLcode Curl_set_dns_local_ip4(struct SessionHandle *data,
const char *local_ip4)
{
#if (ARES_VERSION >= 0x010704)
uint32_t a4;
if((!local_ip4) || (local_ip4[0] == 0)) {
a4 = 0; /* disabled: do not bind to a specific address */
}
else {
if(Curl_inet_pton(AF_INET, local_ip4, &a4) != 1) {
return CURLE_BAD_FUNCTION_ARGUMENT;
}
}
ares_set_local_ip4((ares_channel)data->state.resolver, ntohl(a4));
return CURLE_OK;
#else /* c-ares version too old! */
(void)data;
(void)local_ip4;
return CURLE_NOT_BUILT_IN;
#endif
}
CURLcode Curl_set_dns_local_ip6(struct SessionHandle *data,
const char *local_ip6)
{
#if (ARES_VERSION >= 0x010704)
unsigned char a6[INET6_ADDRSTRLEN];
if((!local_ip6) || (local_ip6[0] == 0)) {
/* disabled: do not bind to a specific address */
memset(a6, 0, sizeof(a6));
}
else {
if(Curl_inet_pton(AF_INET6, local_ip6, a6) != 1) {
return CURLE_BAD_FUNCTION_ARGUMENT;
}
}
ares_set_local_ip6((ares_channel)data->state.resolver, a6);
return CURLE_OK;
#else /* c-ares version too old! */
(void)data;
(void)local_ip6;
return CURLE_NOT_BUILT_IN;
#endif
}
#endif /* CURLRES_ARES */