CURLOPT_DNS_INTERFACE - Online Linux Manual PageSection : 3
Updated : November 26, 2021
Source : libcurl 7.82.0
Note : curl_easy_setopt options
NAMECURLOPT_DNS_INTERFACE − interface to speak DNS over
SYNOPSIS#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_INTERFACE, char *ifname);
DESCRIPTIONPass a char * as parameter. Set the name of the network interface that the DNS resolver should bind to. This must be an interface name (not an address). Set this option to NULL to use the default setting (do not bind to a specific interface). The application does not have to keep the string around after setting this option.
DEFAULTNULL
PROTOCOLS
EXAMPLECURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
curl_easy_setopt(curl, CURLOPT_DNS_INTERFACE, "eth0");
ret = curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
AVAILABILITYAdded in 7.33.0. This option also requires that libcurl was built with a resolver backend that supports this operation. The c-ares backend is the only such one.
RETURN VALUEReturns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_NOT_BUILT_IN if support was disabled at compile-time.
SEE ALSOCURLOPT_DNS_SERVERS(3), CURLOPT_DNS_LOCAL_IP4 (3)," 0
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