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url: Add option CURLOPT_RESOLVER_START_FUNCTION

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- Add new option CURLOPT_RESOLVER_START_FUNCTION to set a callback that
  will be called every time before a new resolve request is started
  (ie before a host is resolved) with a pointer to backend-specific
  resolver data. Currently this is only useful for ares.

- Add new option CURLOPT_RESOLVER_START_DATA to set a user pointer to
  pass to the resolver start callback.

Closes https://github.com/curl/curl/pull/2311
This commit is contained in:
Francisco Sedano 2018-02-14 17:20:43 +00:00 • committed by Jay Satiro
parent dd027c80fe
commit 23713645d4
16 changed files with 379 additions and 3 deletions
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10
include/curl/curl.h
View file

@ -245,7 +245,9 @@ typedef size_t (*curl_write_callback)(char *buffer,
size_t nitems,
void *outstream);
/* This callback will be called when a new resolver request is made */
typedef int (*curl_resolver_start_callback)(void *resolver_state,
void *reserved, void *userdata);
/* enumeration of file types */
typedef enum {
@ -1833,6 +1835,12 @@ typedef enum {
/* Head start in milliseconds to give happy eyeballs. */
CINIT(HAPPY_EYEBALLS_TIMEOUT_MS, LONG, 271),
/* Function that will be called before a resolver request is made */
CINIT(RESOLVER_START_FUNCTION, FUNCTIONPOINT, 272),
/* User data to pass to the resolver start callback. */
CINIT(RESOLVER_START_DATA, OBJECTPOINT, 273),
CURLOPT_LASTENTRY /* the last unused */
} CURLoption;

13
include/curl/typecheck-gcc.h
View file

@ -54,6 +54,9 @@ __extension__ ({ \
if(_curl_is_write_cb_option(_curl_opt)) \
if(!_curl_is_write_cb(value)) \
_curl_easy_setopt_err_write_callback(); \
if((_curl_opt) == CURLOPT_RESOLVER_START_FUNCTION) \
if(!_curl_is_resolver_start_callback(value)) \
_curl_easy_setopt_err_resolver_start_callback(); \
if((_curl_opt) == CURLOPT_READFUNCTION) \
if(!_curl_is_read_cb(value)) \
_curl_easy_setopt_err_read_cb(); \
@ -170,6 +173,10 @@ _CURL_WARNING(_curl_easy_setopt_err_string,
)
_CURL_WARNING(_curl_easy_setopt_err_write_callback,
"curl_easy_setopt expects a curl_write_callback argument for this option")
_CURL_WARNING(_curl_easy_setopt_err_resolver_start_callback,
"curl_easy_setopt expects a "
"curl_resolver_start_callback argument for this option"
)
_CURL_WARNING(_curl_easy_setopt_err_read_cb,
"curl_easy_setopt expects a curl_read_callback argument for this option")
_CURL_WARNING(_curl_easy_setopt_err_ioctl_cb,
@ -354,6 +361,7 @@ _CURL_WARNING(_curl_easy_getinfo_err_curl_off_t,
(option) == CURLOPT_SSH_KEYDATA || \
(option) == CURLOPT_SSL_CTX_DATA || \
(option) == CURLOPT_WRITEDATA || \
(option) == CURLOPT_RESOLVER_START_DATA || \
0)
/* evaluates to true if option takes a POST data argument (void* or char*) */
@ -504,6 +512,11 @@ _CURL_WARNING(_curl_easy_getinfo_err_curl_off_t,
(__builtin_types_compatible_p(__typeof__(func), type) || \
__builtin_types_compatible_p(__typeof__(func) *, type))
/* evaluates to true if expr is of type curl_resolver_start_callback */
#define _curl_is_resolver_start_callback(expr) \
(_curl_is_NULL(expr) || \
_curl_callback_compatible((expr), curl_resolver_start_callback))
/* evaluates to true if expr is of type curl_read_callback or "similar" */
#define _curl_is_read_cb(expr) \
(_curl_is_NULL(expr) || \