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86 lines
2.9 KiB
Groff
86 lines
2.9 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_INTERFACE 3 "17 Jun 2014" libcurl libcurl
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.SH NAME
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CURLOPT_INTERFACE \- source interface for outgoing traffic
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_INTERFACE, char *interface);
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.fi
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.SH DESCRIPTION
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Pass a char * as parameter. This sets the \fIinterface\fP name to use as
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outgoing network interface. The name can be an interface name, an IP address,
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or a host name.
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If the parameter starts with "if!" then it is treated only as an interface
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name. If the parameter starts with \&"host!" it is treated as either an IP
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address or a hostname.
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If "if!" is specified but the parameter does not match an existing interface,
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\fICURLE_INTERFACE_FAILED\fP is returned from the libcurl function used to
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perform the transfer.
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libcurl does not support using network interface names for this option on
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Windows.
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We strongly advise against specifying the interface with a hostname, as it
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causes libcurl to do a blocking name resolve call to retrieve the IP
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address. That name resolve operation does \fBnot\fP use DNS-over-HTTPS even if
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\fICURLOPT_DOH_URL(3)\fP is set.
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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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.SH DEFAULT
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NULL, use whatever the TCP stack finds suitable
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.SH PROTOCOLS
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All
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.SH EXAMPLE
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.nf
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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_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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.fi
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.SH AVAILABILITY
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The "if!" and "host!" syntax was added in 7.24.0.
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.SH RETURN VALUE
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Returns CURLE_OK on success or
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CURLE_OUT_OF_MEMORY if there was insufficient heap space.
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.SH "SEE ALSO"
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.BR CURLOPT_SOCKOPTFUNCTION (3),
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.BR CURLOPT_TCP_NODELAY (3)
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