Section 3: library functions
CURLOPT_DNS_USE_GLOBAL_CACHE – enable/disable global DNS cache Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_USE_GLOBAL_CACHE, long enable); DescriptionPass a long. If the enable value is 1, it tells curl to use a global DNS cache that will survive between easy handle creations and deletions. This is not thread-safe and this will use a global variable. WARNING: this option…
CURLOPT_DNS_SERVERS – set preferred DNS servers Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_SERVERS, char *servers); DescriptionPass a char * that is the list of DNS servers to be used instead of the system default. The format of the dns servers option is: host[:port][,host[:port]]… For example: 192.168.1.100,192.168.1.101,3.4.5.6 DefaultNULL – use system default ProtocolsAll ExampleTODO AvailabilityThis option requires…
CURLOPT_DNS_LOCAL_IP6 – IPv6 address to bind DNS resolves to Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_LOCAL_IP6, char *address); DescriptionSet the local IPv6 address that the resolver should bind to. The argument should be of type char * and contain a single IPv6 address as a string. Set this option to NULL to use the default setting…
CURLOPT_DNS_LOCAL_IP4 – IPv4 address to bind DNS resolves to Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_LOCAL_IP4, char *address); DescriptionSet the local IPv4 address that the resolver should bind to. The argument should be of type char * and contain a single numerical IPv4 address as a string. Set this option to NULL to use the default…
CURLOPT_DNS_INTERFACE – set interface to speak DNS over Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_INTERFACE, char *ifname); DescriptionPass a char * as parameter. Set the name of the network interface that the DNS resolver should bind to. This must be an interface name (not an address). Set this option to NULL to use the default setting…
CURLOPT_DNS_CACHE_TIMEOUT – set life-time for DNS cache entries Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_CACHE_TIMEOUT, long age); DescriptionPass a long, this sets the timeout in seconds. Name resolves will be kept in memory and used for this number of seconds. Set to zero to completely disable caching, or set to -1 to make the cached entries…
CURLOPT_DIRLISTONLY – ask for names only in a directory listing Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DIRLISTONLY, long listonly); DescriptionFor FTP and SFTP based URLs a parameter set to 1 tells the library to list the names of files in a directory, rather than performing a full directory listing that would normally include file sizes, dates…
CURLOPT_DEBUGFUNCTION – debug callback Synopsis#include <curl/curl.h> typedef enum { CURLINFO_TEXT = 0, CURLINFO_HEADER_IN, /* 1 */ CURLINFO_HEADER_OUT, /* 2 */ CURLINFO_DATA_IN, /* 3 */ CURLINFO_DATA_OUT, /* 4 */ CURLINFO_SSL_DATA_IN, /* 5 */ CURLINFO_SSL_DATA_OUT, /* 6 */ CURLINFO_END } curl_infotype; int debug_callback(CURL *handle, curl_infotype type, char *data, size_t size, void *userptr); CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DEBUGFUNCTION, debug_callback);DescriptionPass…
CURLOPT_DEBUGDATA – custom pointer for debug callback Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DEBUGDATA, void *pointer); DescriptionPass a pointer to whatever you want passed in to your CURLOPT_DEBUGFUNCTION(3) in the last void * argument. This pointer is not used by libcurl, it is only passed to the callback. DefaultNULL ProtocolsAll Examplehttp://curl.haxx.se/libcurl/c/debug.html AvailabilityAlways Return ValueReturns CURLE_OK See…
CURLOPT_CUSTOMREQUEST – custom string for request Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CUSTOMREQUEST, char *request); DescriptionPass a pointer to a zero terminated string as parameter. When you change the request method by setting CURLOPT_CUSTOMREQUEST(3) to something, you don’t actually change how libcurl behaves or acts in regards to the particular request method, it will only change…
CURLOPT_CRLFILE – specify a Certificate Revocation List file Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CRLFILE, char *file); DescriptionPass a char * to a zero terminated string naming a file with the concatenation of CRL (in PEM format) to use in the certificate validation that occurs during the SSL exchange. When curl is built to use NSS…
CURLOPT_CRLF – enable/disable CRLF conversion Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CRLF, long conv); DescriptionPass a long. If the value is set to 1 (one), libcurl converts Unix newlines to CRLF newlines on transfers. Disable this option again by setting the value to 0 (zero). This is a legacy option of questionable use. Default0 ProtocolsAll ExampleTODO…
CURLOPT_COPYPOSTFIELDS – have libcurl copy data to POST Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_COPYPOSTFIELDS, char *data); DescriptionPass a char * as parameter, which should be the full data to post in a HTTP POST operation. It behaves as the CURLOPT_POSTFIELDS(3) option, but the original data is instead copied by the library, allowing the application to…
CURLOPT_COOKIESESSION – start a new cookie session Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_COOKIESESSION, long init); DescriptionPass a long set to 1 to mark this as a new cookie "session". It will force libcurl to ignore all cookies it is about to load that are "session cookies" from the previous session. By default, libcurl always stores…
CURLOPT_COOKIELIST – add to or manipulate cookies held in memory Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_COOKIELIST, char *cookie);DescriptionPass a char * to a cookie string. Such a cookie can be either a single line in Netscape / Mozilla format or just regular HTTP-style header (Set-Cookie: …) format. This will also enable the cookie engine. This…
CURLOPT_COOKIEJAR – file name to store cookies to Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_COOKIEJAR, char *filename); DescriptionPass a filename as char *, zero terminated. This will make libcurl write all internally known cookies to the specified file when curl_easy_cleanup(3) is called. If no cookies are known, no file will be created. Specify "-" as filename…
CURLOPT_COOKIEFILE – file name to read cookies from Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_COOKIEFILE, char *filename); DescriptionPass a pointer to a zero terminated string as parameter. It should point to the file name of your file holding cookie data to read. The cookie data can be in either the old Netscape / Mozilla cookie data…
CURLOPT_COOKIE – set contents of HTTP Cookie header Synopsis#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_COOKIE, char *cookie); DescriptionPass a pointer to a zero terminated string as parameter. It will be used to set a cookie in the HTTP request. The format of the string should be NAME=CONTENTS, where NAME is the cookie name and CONTENTS is…
CURLOPT_CONV_TO_NETWORK_FUNCTION – convert data to network from host encoding Synopsis#include <curl/curl.h> CURLcode conv_callback(char *ptr, size_t length); CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CONV_TO_NETWORK_FUNCTION, conv_callback);DescriptionPass a pointer to your callback function, which should match the prototype shown above. Applies to non-ASCII platforms. curl_version_info(3) will return the CURL_VERSION_CONV feature bit set if this option is provided. The data to be…
CURLOPT_CONV_FROM_UTF8_FUNCTION – convert data from UTF8 to host encoding Synopsis#include <curl/curl.h> CURLcode conv_callback(char *ptr, size_t length); CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CONV_FROM_UTF8_FUNCTION, conv_callback);DescriptionPass a pointer to your callback function, which should match the prototype shown above. Applies to non-ASCII platforms. curl_version_info(3) will return the CURL_VERSION_CONV feature bit set if this option is provided. The data to be…