CURLOPT_RESOLVE(3)

CURLOPT_RESOLVE(3)  curl_easy_setopt options   CURLOPT_RESOLVE(3)

NAME

     CURLOPT_RESOLVE - provide custom host  name  to  IP  address
     resolves

SYNOPSIS

     #include <curl/curl.h>

     CURLcode curl_easy_setopt(CURL *handle, CURLOPT_RESOLVE,
                               struct curl_slist *hosts);

DESCRIPTION

     Pass a pointer to a linked list of strings  with  host  name
     resolve  information  to  use for requests with this handle.
     The linked list should be  a  fully  valid  list  of  struct
     curl_slist     structs     properly     filled    in.    Use
     curl_slist_append(3)    to    create    the     list     and
     curl_slist_free_all(3) to clean up an entire list.

     Each single name resolve string should be written using  the
     format HOST:PORT:ADDRESS where HOST is the name libcurl will
     try to resolve, PORT is the port number of the service where
     libcurl  wants  to  connect  to  the HOST and ADDRESS is the
     numerical IP address. If libcurl is built to  support  IPv6,
     ADDRESS  can of course be either IPv4 or IPv6 style address-
     ing.

     This option effectively pre-populates  the  DNS  cache  with
     entries  for  the host+port pair so redirects and everything
     that operations against the HOST+PORT will instead use  your
     provided ADDRESS. Addresses set with CURLOPT_RESOLVE(3) will
     not time-out from the DNS cache like ordinary entries.

     The provided ADDRESS set by this option will be used even if
     CURLOPT_IPRESOLVE(3)  is  set to make libcurl use another IP
     version.

     Remove names from the DNS cache  again,  to  stop  providing
     these  fake  resolves,  by  including a string in the linked
     list that uses the format "-HOST:PORT". The host  name  must
     be  prefixed  with a dash, and the host name and port number
     must exactly match what was already added previously.

     Support for providing  the  ADDRESS  within  [brackets]  was
     added in 7.57.0.

DEFAULT

     NULL

PROTOCOLS

     All

libcurl 7.58.0   Last change: November 17, 2017                 1

CURLOPT_RESOLVE(3)  curl_easy_setopt options   CURLOPT_RESOLVE(3)

EXAMPLE

     CURL *curl;
     struct curl_slist *host = NULL;
     host = curl_slist_append(NULL, "example.com:80:127.0.0.1");

     curl = curl_easy_init();
     if(curl) {
       curl_easy_setopt(curl, CURLOPT_RESOLVE, host);
       curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");

       curl_easy_perform(curl);

       /* always cleanup */
       curl_easy_cleanup(curl);
     }

     curl_slist_free_all(host);

AVAILABILITY

     Added in 7.21.3. Removal support added in 7.42.0.

RETURN VALUE

     Returns  CURLE_OK  if   the   option   is   supported,   and
     CURLE_UNKNOWN_OPTION if not.

SEE ALSO

     CURLOPT_IPRESOLVE(3),          CURLOPT_DNS_CACHE_TIMEOUT(3),
     CURLOPT_CONNECT_TO(3),

libcurl 7.58.0   Last change: November 17, 2017                 2