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c4ab33370a
Went through CURLOPTTYPE_STRINGPOINT and CURLOPTTYPE_SLISTPOINT options and clarified: - what happens when setting the option *again* - setting to NULL disables/restores to default - libcurl does not copy the slist for options using a such Closes #14846
74 lines
1.6 KiB
Markdown
74 lines
1.6 KiB
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_DNS_INTERFACE
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_DNS_LOCAL_IP4 (3)
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- CURLOPT_DNS_LOCAL_IP6 (3)
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- CURLOPT_DNS_SERVERS (3)
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- CURLOPT_INTERFACE (3)
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Protocol:
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- All
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Added-in: 7.33.0
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---
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# NAME
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CURLOPT_DNS_INTERFACE - interface to speak DNS over
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_INTERFACE, char *ifname);
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~~~
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# DESCRIPTION
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Pass a char pointer as parameter. Set the name of the network interface that
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the DNS resolver should bind to. This must be an interface name (not an
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address). Set this option to NULL to use the default setting (do not bind to a
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specific interface).
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The application does not have to keep the string around after setting this
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option.
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Using this option multiple times makes the last set string override the
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previous ones. Set it to NULL to disable its use again.
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# DEFAULT
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NULL
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# %PROTOCOLS%
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
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curl_easy_setopt(curl, CURLOPT_DNS_INTERFACE, "eth0");
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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# NOTES
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This option requires that libcurl was built with a resolver backend that
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supports this operation. The c-ares backend is the only such one.
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# %AVAILABILITY%
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# RETURN VALUE
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Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not,
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or CURLE_NOT_BUILT_IN if support was disabled at compile-time.
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