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CURLOPT_DNS_LOCAL_IP4(3) Library Functions Manual CURLOPT_DNS_LOCAL_IP4(3) NAME CURLOPT_DNS_LOCAL_IP4 - IPv4 address to bind DNS resolves to SYNOPSIS #include <curl/curl.h> 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. 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_LOCAL_IP4, "192.168.0.14"); 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_INTERFACE(3), CURLOPT_DNS_LOCAL_IP6(3), CURLOPT_DNS_SERVERS(3) libcurl 2026-06-11 CURLOPT_DNS_LOCAL_IP4(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | NOTES | AVAILABILITY | RETURN VALUE | SEE ALSO
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