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CURLOPT_INTERFACE(3)

CURLOPT_INTERFACE(3)       curl_easy_setopt options       CURLOPT_INTERFACE(3)

NAME
       CURLOPT_INTERFACE - source interface for outgoing traffic

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_INTERFACE, char *interface);

DESCRIPTION
       Pass a char * as parameter. This sets the interface name to use as out‐
       going  network  interface. The name can be an interface name, an IP ad‐
       dress, or a host name.

       If the parameter starts with "if!" then it is treated as only as inter‐
       face name and no attempt will ever be named to do treat it as an IP ad‐
       dress or to do name resolution on it.  If  the  parameter  starts  with
       "host!" it is treated as either an IP address or a hostname.  Hostnames
       are resolved synchronously.  Using the if! format is highly recommended
       when  using  the  multi interfaces to avoid allowing the code to block.
       If "if!" is specified but the parameter does not match an existing  in‐
       terface,  CURLE_INTERFACE_FAILED  is returned from the libcurl function
       used to perform the transfer.

       libcurl does not support using network interface names for this  option
       on Windows.

       The  application  does not have to keep the string around after setting
       this option.

DEFAULT
       NULL, use whatever the TCP stack finds suitable

PROTOCOLS
       All

EXAMPLE
       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");

         curl_easy_setopt(curl, CURLOPT_INTERFACE, "eth0");

         ret = curl_easy_perform(curl);

         curl_easy_cleanup(curl);
       }

AVAILABILITY
       The "if!" and "host!" syntax was added in 7.24.0.

RETURN VALUE
       Returns CURLE_OK on success or CURLE_OUT_OF_MEMORY if there was  insuf‐
       ficient heap space.

SEE ALSO
       CURLOPT_SOCKOPTFUNCTION(3), CURLOPT_TCP_NODELAY(3),

libcurl 7.86.0                   May 17, 2022             CURLOPT_INTERFACE(3)
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