CURLOPT_DOH_URL - HTTPS URL
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_URL, char *URL);
CURLOPT_DOH_URL(3) curl_easy_setopt options CURLOPT_DOH_URL(3) NAME CURLOPT_DOH_URL - provide the DNS-over-HTTPS URL SYNOPSIS #include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DOH_URL, char *URL); DESCRIPTION Pass in a pointer to a URL for the DoH server to use for name resolv- ing. The parameter should be a char * to a null-terminated string which must be URL-encoded in the following format: "https://host:port/path". It MUST specify an HTTPS URL. libcurl does not validate the syntax or use this variable until the transfer is issued. Even if you set a crazy value here, curl_easy_setopt(3) will still return CURLE_OK. curl sends POST requests to the given DNS-over-HTTPS URL. To find the DoH server itself, which might be specified using a name, libcurl will use the default name lookup function. You can bootstrap that by providing the address for the DoH server with CUR- LOPT_RESOLVE(3). Disable DoH use again by setting this option to NULL. INHERIT OPTIONS DoH lookups use SSL and some SSL settings from your transfer are inher- ited, like CURLOPT_SSL_CTX_FUNCTION(3). The hostname and peer certificate verification settings are not inher- ited but can be controlled separately via CURLOPT_DOH_SSL_VERIFYHOST(3) and CURLOPT_DOH_SSL_VERIFYPEER(3). A set CURLOPT_OPENSOCKETFUNCTION(3) callback is not inherited. KNOWN BUGS Even when DoH is set to be used with this option, there are still some name resolves that are performed without it, using the default name resolver mechanism. This includes name resolves done for CURLOPT_INTER- FACE(3), CURLOPT_FTPPORT(3), a proxy type set to CURLPROXY_SOCKS4 or CURLPROXY_SOCKS5 and probably some more. DEFAULT NULL - there is no default DoH URL. If this option is not set, libcurl will use the default name resolver. PROTOCOLS All EXAMPLE CURL *curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); curl_easy_setopt(curl, CURLOPT_DOH_URL, "https://dns.example.com"); curl_easy_perform(curl); } AVAILABILITY Added in 7.62.0 RETURN VALUE Returns CURLE_OK on success or CURLE_OUT_OF_MEMORY if there was insuf- ficient heap space. Note that curl_easy_setopt(3) will not immediately parse the given string so when given a bad DoH URL, libcurl might not detect the prob- lem until it later tries to resolve a name with it. ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+------------------+ |Availability | web/curl | +---------------+------------------+ |Stability | Uncommitted | +---------------+------------------+ SEE ALSO CURLOPT_VERBOSE(3), CURLOPT_RESOLVE(3), NOTES Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from https://curl.se/down- load/curl-7.83.1.tar.bz2. Further information about this software can be found on the open source community website at http://curl.haxx.se/. libcurl 7.83.1 May 04, 2022 CURLOPT_DOH_URL(3)