FreeBSD Manual Pages
CURLOPT_DNS_INTERFACE(3) Library Functions Manual CURLOPT_DNS_INTERFACE(3) NAME CURLOPT_DNS_INTERFACE - interface to speak DNS over SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_INTERFACE, char *ifname); 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. Using this option multiple times makes the last set string override the previous ones. Set it to NULL to disable its use again. DEFAULT NULL PROTOCOLS This functionality affects all supported protocols EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin"); curl_easy_setopt(curl, CURLOPT_DNS_INTERFACE, "eth0"); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } 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. AVAILABILITY Added in curl 7.33.0 RETURN VALUE curl_easy_setopt(3) returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3). SEE ALSO CURLOPT_DNS_LOCAL_IP4(3), CURLOPT_DNS_LOCAL_IP6(3), CURLOPT_DNS_SERVERS(3), CURLOPT_INTERFACE(3) libcurl 2026-06-11 CURLOPT_DNS_INTERFACE(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | NOTES | AVAILABILITY | RETURN VALUE | SEE ALSO
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=CURLOPT_DNS_INTERFACE&sektion=3&manpath=FreeBSD+Ports+15.1.quarterly>