e3fe020089
Remove the PROTOCOLS section from the source files completely and instead generate them based on the header data in the curldown files. It also generates TLS backend information for options marked for TLS as protocol. Closes #13175
83 lines
1.9 KiB
Markdown
83 lines
1.9 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_INTERFACE
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Section: 3
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Source: libcurl
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Protocol:
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- All
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See-also:
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- CURLOPT_SOCKOPTFUNCTION (3)
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- CURLOPT_TCP_NODELAY (3)
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- CURLOPT_LOCALPORT (3)
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---
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# NAME
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CURLOPT_INTERFACE - source interface for outgoing traffic
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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_INTERFACE, char *interface);
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~~~
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# DESCRIPTION
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Pass a char pointer as parameter. This sets the *interface* 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 hostname.
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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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*CURLE_INTERFACE_FAILED* is returned from the libcurl function used to perform
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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 **not** use DNS-over-HTTPS even if
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CURLOPT_DOH_URL(3) 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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# DEFAULT
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NULL, use whatever the TCP stack finds suitable
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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_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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# AVAILABILITY
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The "if!" and "host!" syntax was added in 7.24.0.
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# 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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