--- c: Copyright (C) Daniel Stenberg, , et al. SPDX-License-Identifier: curl Title: CURLOPT_DNS_LOCAL_IP4 Section: 3 Source: libcurl See-also: - CURLOPT_DNS_INTERFACE (3) - CURLOPT_DNS_LOCAL_IP6 (3) - CURLOPT_DNS_SERVERS (3) --- # NAME CURLOPT_DNS_LOCAL_IP4 - IPv4 address to bind DNS resolves to # SYNOPSIS ~~~c #include CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_LOCAL_IP4, char *address); ~~~ # DESCRIPTION Set the local IPv4 *address* that the resolver should bind to. The argument should be of type char * and contain a single numerical IPv4 address as a string. Set this option to NULL to use the default setting (do not bind to a specific IP address). The application does not have to keep the string around after setting this option. # DEFAULT NULL # PROTOCOLS All # EXAMPLE ~~~c 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_LOCAL_IP4, "192.168.0.14"); res = curl_easy_perform(curl); curl_easy_cleanup(curl); } } ~~~ # AVAILABILITY This option requires that libcurl was built with a resolver backend that supports this operation. The c-ares backend is the only such one. Added in 7.33.0 # RETURN VALUE Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, CURLE_NOT_BUILT_IN if support was disabled at compile-time, or CURLE_BAD_FUNCTION_ARGUMENT when given a bad address.