php-src/ext/curl/curl_private.h
Ayesh Karunaratne ba748e7bb5
ext/curl: Add CURLOPT_DEBUGFUNCTION option (GH-15674)
This adds support for `CURLOPT_DEBUGFUNCTION`[^1] Curl option to set a
custom callback that gets called with debug information during the
lifetime of a Curl request.

The callback gets called with the `CurlHandle` object, an integer
containing the type of the debug message, and a string containing the
debug message. The callback may get called multiple times with the
same message type during a request.

PHP already uses `CURLOPT_DEBUGFUNCTION` functionality to internally
to expose a Curl option named `CURLINFO_HEADER_OUT`.

However,`CURLINFO_HEADER_OUT` is not a "real" Curl option supported
by libcurl. Back in 2006, `CURLINFO_HEADER_OUT` was added[^2] as
a Curl option by using the debug-callback feature. Git history does
not run that back to show why `CURLINFO_HEADER_OUT` was added as a
Curl option, and why the other debug types (such as
`CURLINFO_HEADER_IN` were not added as Curl options, but this seems
to be a historical artifact when we added features without trying
to be close to libcurl options.

This approach has a few issues:

1. `CURLINFO_HEADER_OUT` is not an actual Curl option supported by
  upstream libcurl.

2. All of the Curl options have `CURLOPT_` prefix, and `CURLINFO_HEADER_OUT`
  is the only Curl "option" that uses the `CURLINFO` prefix. This exception
  is, however, noted[^3] in docs.

3. When `CURLINFO_HEADER_OUT` is set, the `CURLOPT_VERBOSE` is also implicitly
  set. This was reported[^4] to bugs.php.net, but the bug is marked as wontfix.

This commit adds support for `CURLOPT_DEBUGFUNCTION`. It extends the existing
`curl_debug` callback to store the header-in information if it encounters
a debug message with `CURLINFO_HEADER_OUT`. In all cases, if a callable
is set, it gets called.

`CURLOPT_DEBUGFUNCTION` intends to replace `CURLINFO_HEADER_OUT` Curl
option as a versatile alternative that can also be used to extract
other debug information such as SSL data, text information messages,
incoming headers, as well as headers sent out (which `CURLINFO_HEADER_OUT`
makes available).

The callables are allowed to throw exceptions, but the return values are
ignored.

`CURLOPT_DEBUGFUNCTION` requires `CURLOPT_VERBOSE` enabled, and setting
`CURLOPT_DEBUGFUNCTION` does _not_ implicitly enable `CURLOPT_VERBOSE`.

If the `CURLOPT_DEBUGFUNCTION` option is set, setting `CURLINFO_HEADER_OUT`
throws a `ValueError` exception. Setting `CURLOPT_DEBUGFUNCTION` _after_
enabling `CURLINFO_HEADER_OUT` is allowed. Technically, it is possible
for both functionality (calling user-provided callback _and_ storing
header-out data) is possible, setting `CURLINFO_HEADER_OUT` is not
allowed to encourage the use of `CURLOPT_DEBUGFUNCTION` function.

This commit also adds the rest of the `CURLINFO_` constants used as
the `type` integer value in `CURLOPT_DEBUGFUNCTION` callback.

---

[^1]: [cur.se - CURLOPT_DEBUGFUNCTION](https://curl.se/libcurl/c/CURLOPT_DEBUGFUNCTION.html)
[^2]: [`5f25d80`](5f25d80d10)
[^3]: [curl_setopt doc mentioning `CURLINFO_` prefix is intentional](https://www.php.net/manual/en/function.curl-setopt.php#:~:text=prefix%20is%20intentional)
[^4]: [bugs.php.net - `CURLOPT_VERBOSE` does not work with `CURLINFO_HEADER_OUT`](https://bugs.php.net/bug.php?id=65348)
2024-09-24 10:56:56 +02:00

159 lines
4.5 KiB
C

/*
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| https://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Sterling Hughes <sterling@php.net> |
| Wez Furlong <wez@thebrainroom.com> |
+----------------------------------------------------------------------+
*/
#ifndef _PHP_CURL_PRIVATE_H
#define _PHP_CURL_PRIVATE_H
#include "php_curl.h"
#define PHP_CURL_DEBUG 0
#include "php_version.h"
#define PHP_CURL_VERSION PHP_VERSION
#include <curl/curl.h>
#include <curl/multi.h>
#define CURLOPT_RETURNTRANSFER 19913
#define CURLOPT_BINARYTRANSFER 19914 /* For Backward compatibility */
#define PHP_CURL_STDOUT 0
#define PHP_CURL_FILE 1
#define PHP_CURL_USER 2
#define PHP_CURL_DIRECT 3
#define PHP_CURL_RETURN 4
#define PHP_CURL_IGNORE 7
#define SAVE_CURL_ERROR(__handle, __err) \
do { (__handle)->err.no = (int) __err; } while (0)
PHP_MINIT_FUNCTION(curl);
PHP_MSHUTDOWN_FUNCTION(curl);
PHP_MINFO_FUNCTION(curl);
typedef struct {
zend_fcall_info_cache fcc;
FILE *fp;
smart_str buf;
int method;
zval stream;
} php_curl_write;
typedef struct {
zend_fcall_info_cache fcc;
FILE *fp;
zend_resource *res;
int method;
zval stream;
} php_curl_read;
typedef struct {
php_curl_write *write;
php_curl_write *write_header;
php_curl_read *read;
zval std_err;
zend_fcall_info_cache progress;
zend_fcall_info_cache xferinfo;
zend_fcall_info_cache fnmatch;
zend_fcall_info_cache debug;
#if LIBCURL_VERSION_NUM >= 0x075000 /* Available since 7.80.0 */
zend_fcall_info_cache prereq;
#endif
#if LIBCURL_VERSION_NUM >= 0x075400 /* Available since 7.84.0 */
zend_fcall_info_cache sshhostkey;
#endif
} php_curl_handlers;
struct _php_curl_error {
char str[CURL_ERROR_SIZE + 1];
int no;
};
struct _php_curl_send_headers {
zend_string *str;
};
struct _php_curl_free {
zend_llist post;
zend_llist stream;
HashTable *slist;
};
typedef struct {
CURL *cp;
php_curl_handlers handlers;
struct _php_curl_free *to_free;
struct _php_curl_send_headers header;
struct _php_curl_error err;
bool in_callback;
uint32_t* clone;
zval postfields;
/* For CURLOPT_PRIVATE */
zval private_data;
/* CurlShareHandle object set using CURLOPT_SHARE. */
struct _php_curlsh *share;
zend_object std;
} php_curl;
#define CURLOPT_SAFE_UPLOAD -1
typedef struct {
zend_fcall_info_cache server_push;
} php_curlm_handlers;
typedef struct {
CURLM *multi;
zend_llist easyh;
php_curlm_handlers handlers;
struct {
int no;
} err;
zend_object std;
} php_curlm;
typedef struct _php_curlsh {
CURLSH *share;
struct {
int no;
} err;
zend_object std;
} php_curlsh;
php_curl *init_curl_handle_into_zval(zval *curl);
void init_curl_handle(php_curl *ch);
void _php_curl_cleanup_handle(php_curl *);
void _php_curl_multi_cleanup_list(void *data);
void _php_curl_verify_handlers(php_curl *ch, bool reporterror);
void _php_setup_easy_copy_handlers(php_curl *ch, php_curl *source);
static inline php_curl *curl_from_obj(zend_object *obj) {
return (php_curl *)((char *)(obj) - XtOffsetOf(php_curl, std));
}
#define Z_CURL_P(zv) curl_from_obj(Z_OBJ_P(zv))
static inline php_curlsh *curl_share_from_obj(zend_object *obj) {
return (php_curlsh *)((char *)(obj) - XtOffsetOf(php_curlsh, std));
}
#define Z_CURL_SHARE_P(zv) curl_share_from_obj(Z_OBJ_P(zv))
void curl_multi_register_handlers(void);
void curl_share_register_handlers(void);
void curlfile_register_class(void);
zend_result curl_cast_object(zend_object *obj, zval *result, int type);
#endif /* _PHP_CURL_PRIVATE_H */