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- .\" generated by cd2nroff 0.1 from CURLOPT_DNS_INTERFACE.md
- .TH CURLOPT_DNS_INTERFACE 3 "2025-01-17" libcurl
- .SH NAME
- CURLOPT_DNS_INTERFACE \- interface to speak DNS over
- .SH SYNOPSIS
- .nf
- #include <curl/curl.h>
- CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_INTERFACE, char *ifname);
- .fi
- .SH DESCRIPTION
- Pass a char pointer 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.
- .SH DEFAULT
- NULL
- .SH PROTOCOLS
- This functionality affects all supported protocols
- .SH EXAMPLE
- .nf
- int main(void)
- {
- CURL *curl = curl_easy_init();
- if(curl) {
- CURLcode res;
- curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
- curl_easy_setopt(curl, CURLOPT_DNS_INTERFACE, "eth0");
- res = curl_easy_perform(curl);
- curl_easy_cleanup(curl);
- }
- }
- .fi
- .SH NOTES
- This option requires that libcurl was built with a resolver backend that
- supports this operation. The c\-ares backend is the only such one.
- .SH AVAILABILITY
- Added in curl 7.33.0
- .SH RETURN VALUE
- Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not,
- or CURLE_NOT_BUILT_IN if support was disabled at compile\-time.
- .SH SEE ALSO
- .BR CURLOPT_DNS_LOCAL_IP4 (3),
- .BR CURLOPT_DNS_LOCAL_IP6 (3),
- .BR CURLOPT_DNS_SERVERS (3),
- .BR CURLOPT_INTERFACE (3)
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