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deps/curl/docs/libcurl/opts/CURLOPT_DNS_LOCAL_IP4.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, 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 <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.
+
+# 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.