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curl/docs/libcurl/opts/CURLOPT_DNS_INTERFACE.3

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+.\" **************************************************************************
+.\" *                                  _   _ ____  _
+.\" *  Project                     ___| | | |  _ \| |
+.\" *                             / __| | | | |_) | |
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+.\" *                             \___|\___/|_| \_\_____|
+.\" *
+.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <[email protected]>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
+.\" * you should have received as part of this distribution. The terms
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+.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+.\" * copies of the Software, and permit persons to whom the Software is
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+.\" *
+.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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+.\" *
+.\" **************************************************************************
+.\"
+.TH CURLOPT_DNS_INTERFACE 3 "November 04, 2020" "libcurl 7.75.0" "curl_easy_setopt options"
+
+.SH NAME
+CURLOPT_DNS_INTERFACE \- set interface to speak DNS over
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_INTERFACE, char *ifname);
+.SH DESCRIPTION
+Pass a char * 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 (don't bind to a specific
+interface).
+
+The application does not have to keep the string around after setting this
+option.
+.SH DEFAULT
+NULL
+.SH PROTOCOLS
+.SH EXAMPLE
+.nf
+CURL *curl = curl_easy_init();
+if(curl) {
+  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
+  curl_easy_setopt(curl, CURLOPT_DNS_INTERFACE, "eth0");
+  ret = curl_easy_perform(curl);
+  curl_easy_cleanup(curl);
+}
+.fi
+.SH AVAILABILITY
+Added in 7.33.0. This option also requires that libcurl was built with a
+resolver backend that supports this operation. The c-ares backend is the only
+such one.
+.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_SERVERS "(3), " CURLOPT_DNS_LOCAL_IP4 "(3), "