CURLOPT_RESOLVE(3) curl_easy_setopt options CURLOPT_RESOLVE(3)NAMECURLOPT_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 addressing.
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 to set
with CURL_RESOLVE will not time-out from the DNS cache like ordinary
entries.
You can 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. (Added in 7.42.0)
DEFAULT
NULL
PROTOCOLS
All
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");
res = 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 ALSOCURLOPT_IPRESOLVE(3), CURLOPT_DNS_CACHE_TIMEOUT(3),
libcurl 7.37.0 19 Jun 2014 CURLOPT_RESOLVE(3)