http_fopen_wrapper.c

php-4.4.7学习linux时下载的源代码

/*
   +----------------------------------------------------------------------+
   | PHP Version 4                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2007 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:           |
   | http://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          |
   | [e-mail] so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Rasmus Lerdorf <[e-mail]>                             |
   |          Jim Winstead <[e-mail]>                                 |
   |          Hartmut Holzgraefe <[e-mail]>                       |
   |          Wez Furlong <[e-mail]>                          |
   +----------------------------------------------------------------------+
 */
/* $Id: http_fopen_wrapper.c,v 1.53.2.20.2.10 2007/01/01 09:46:48 sebastian Exp $ */ 

#include "php.h"
#include "php_globals.h"
#include "php_streams.h"
#include "php_network.h"
#include "php_ini.h"
#include "ext/standard/basic_functions.h"

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#ifdef PHP_WIN32
#include <windows.h>
#include <winsock.h>
#define O_RDONLY _O_RDONLY
#include "win32/param.h"
#else
#include <sys/param.h>
#endif

#include "php_standard.h"

#include <sys/types.h>
#if HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif

#ifdef PHP_WIN32
#include <winsock.h>
#elif defined(NETWARE) && defined(USE_WINSOCK)
#include <novsock2.h>
#else
#include <netinet/in.h>
#include <netdb.h>
#if HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#endif

#if defined(PHP_WIN32) || defined(__riscos__) || defined(NETWARE)
#undef AF_UNIX
#endif

#if defined(AF_UNIX)
#include <sys/un.h>
#endif

#include "php_fopen_wrappers.h"

#define HTTP_HEADER_BLOCK_SIZE		1024
#define PHP_URL_REDIRECT_MAX		20
#define HTTP_HEADER_USER_AGENT		1
#define HTTP_HEADER_HOST		2
#define HTTP_HEADER_AUTH		4
#define HTTP_HEADER_FROM		8

php_stream *php_stream_url_wrap_http_ex(php_stream_wrapper *wrapper, char *path, char *mode, int options, char **opened_path, php_stream_context *context, int redirect_max, int header_init STREAMS_DC TSRMLS_DC)
{
	php_stream *stream = NULL;
	php_url *resource = NULL;
	int use_ssl;
	char *scratch = NULL;
	char *tmp = NULL;
	char *ua_str = NULL;
	zval **ua_zval = NULL, **tmpzval = NULL;
	int scratch_len = 0;
	int body = 0;
	char location[HTTP_HEADER_BLOCK_SIZE];
	zval **response_header = NULL;
	int reqok = 0;
	char *http_header_line = NULL;
	char tmp_line[128];
	size_t chunk_size = 0, file_size = 0;
	int eol_detect, have_header = 0;

	tmp_line[0] = '\0';

 	if (redirect_max < 1) {
 		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Circular redirect, aborting.");
 		return NULL;
 	}

	if (strpbrk(mode, "aw+")) {
		php_stream_wrapper_log_error(wrapper, options TSRMLS_CC, "HTTP wrapper does not support writeable connections.");
		return NULL;
	}

	resource = php_url_parse(path);
	if (resource == NULL) {
		return NULL;
	}

 	if (strncasecmp(resource->scheme, "http", sizeof("http")) && strncasecmp(resource->scheme, "https", sizeof("https"))) {
 		php_url_free(resource);
 		return php_stream_open_wrapper_ex(path, mode, ENFORCE_SAFE_MODE | REPORT_ERRORS, NULL, context);
 	}
	
	use_ssl = resource->scheme && (strlen(resource->scheme) > 4) && resource->scheme[4] == 's';

	/* choose default ports */
	if (use_ssl && resource->port == 0)
		resource->port = 443;
	else if (resource->port == 0)
		resource->port = 80;

	stream = php_stream_sock_open_host(resource->host, resource->port, SOCK_STREAM, NULL, 0);
	if (stream == NULL) {
		eol_detect = 0;
		goto out;
	}

	/* avoid problems with auto-detecting when reading the headers -> the headers
	 * are always in canonical \r\n format */
   	eol_detect = stream->flags & (PHP_STREAM_FLAG_DETECT_EOL | PHP_STREAM_FLAG_EOL_MAC);
	stream->flags &= ~(PHP_STREAM_FLAG_DETECT_EOL | PHP_STREAM_FLAG_EOL_MAC);
	
	php_stream_context_set(stream, context);

	php_stream_notify_info(context, PHP_STREAM_NOTIFY_CONNECT, NULL, 0);
	
#ifdef HAVE_OPENSSL_EXT
	if (use_ssl)	{

		if (context) {
			/* set the CN we expect to be on the remote cert.
			 * You still need to have enabled verification (verify_peer) in the context for
			 * this to have an effect */
			zval *cn;

			ALLOC_INIT_ZVAL(cn);
			ZVAL_STRING(cn, resource->host, 1);
			php_stream_context_set_option(context, "ssl", "CN_match", cn);
		}
		
		if (php_stream_sock_ssl_activate(stream, 1) == FAILURE)	{
			php_stream_wrapper_log_error(wrapper, options TSRMLS_CC, "Unable to activate SSL mode");
			php_stream_close(stream);
			stream = NULL;
			goto out;
		}
	}
#endif

	if (context && php_stream_context_get_option(context, "http", "method", &tmpzval) == SUCCESS) {
		if (Z_TYPE_PP(tmpzval) == IS_STRING && Z_STRLEN_PP(tmpzval) > 0) {
	        	scratch_len = strlen(path) + 29 + Z_STRLEN_PP(tmpzval);
	                scratch = emalloc(scratch_len);
	                strlcpy(scratch, Z_STRVAL_PP(tmpzval), Z_STRLEN_PP(tmpzval) + 1);
	                strcat(scratch, " ");
		}
	}

	if (!scratch) {
		scratch_len = strlen(path) + 32;
	        scratch = emalloc(scratch_len);
	        strcpy(scratch, "GET ");
	}

	/* file */
	if (resource->path && *resource->path)
		strlcat(scratch, resource->path, scratch_len);
	else
		strlcat(scratch, "/", scratch_len);
	
	/* query string */
	if (resource->query)	{
		strlcat(scratch, "?", scratch_len);
		strlcat(scratch, resource->query, scratch_len);
	}

	/* protocol version we are speaking */
	strlcat(scratch, " HTTP/1.0\r\n", scratch_len);

	/* send it */
	php_stream_write(stream, scratch, strlen(scratch));
	
	if (context && php_stream_context_get_option(context, "http", "header", &tmpzval) == SUCCESS && 
		Z_TYPE_PP(tmpzval) == IS_STRING && Z_STRLEN_PP(tmpzval)) {
		/* Remove newlines and spaces from start and end, php_trim will estrndup() */
		tmp = php_trim(Z_STRVAL_PP(tmpzval), Z_STRLEN_PP(tmpzval), NULL, 0, NULL, 3 TSRMLS_CC);
		if (strlen(tmp) > 0) {
			/* Output trimmed headers with \r\n at the end */
			php_stream_write(stream, tmp, strlen(tmp));
			php_stream_write(stream, "\r\n", sizeof("\r\n") - 1);

			/* Make lowercase for easy comparison against 'standard' headers */
			php_strtolower(tmp, strlen(tmp));
			if (strstr(tmp, "user-agent:")) {
				 have_header |= HTTP_HEADER_USER_AGENT;
			}
			if (strstr(tmp, "host:")) {
				 have_header |= HTTP_HEADER_HOST;
			}
			if (strstr(tmp, "from:")) {
				 have_header |= HTTP_HEADER_FROM;
				}
			if (strstr(tmp, "authorization:")) {
				 have_header |= HTTP_HEADER_AUTH;
			}
		}
		efree(tmp);
	}

	/* auth header if it was specified */
	if (((have_header & HTTP_HEADER_AUTH) == 0) && resource->user && resource->pass) {
		/* decode the strings first */
		php_url_decode(resource->user, strlen(resource->user));
		php_url_decode(resource->pass, strlen(resource->pass));

		/* scratch is large enough, since it was made large enough for the whole URL */
		strcpy(scratch, resource->user);
		strcat(scratch, ":");
		strcat(scratch, resource->pass);

		tmp = php_base64_encode((unsigned char*)scratch, strlen(scratch), NULL);

		if (snprintf(scratch, scratch_len, "Authorization: Basic %s\r\n", tmp) > 0) {
			php_stream_write(stream, scratch, strlen(scratch));
			php_stream_notify_info(context, PHP_STREAM_NOTIFY_AUTH_REQUIRED, NULL, 0);
		}

		efree(tmp);
		tmp = NULL;
	}

	/* if the user has configured who they are, send a From: line */
	if (((have_header & HTTP_HEADER_FROM) == 0) && cfg_get_string("from", &tmp) == SUCCESS)	{
		if (snprintf(scratch, scratch_len, "From: %s\r\n", tmp) > 0) {
			php_stream_write(stream, scratch, strlen(scratch));
		}
	}

	/* Send Host: header so name-based virtual hosts work */
	if ((have_header & HTTP_HEADER_HOST) == 0) {
		if ((use_ssl && resource->port != 443) || (!use_ssl && resource->port != 80))	{
			if (snprintf(scratch, scratch_len, "Host: %s:%i\r\n", resource->host, resource->port) > 0) {
				php_stream_write(stream, scratch, strlen(scratch));
			}
		} else {
			if (snprintf(scratch, scratch_len, "Host: %s\r\n", resource->host) > 0) {
				php_stream_write(stream, scratch, strlen(scratch));
			}
		}
	}

	if (context && 
	    php_stream_context_get_option(context, "http", "user_agent", &ua_zval) == SUCCESS &&
		Z_TYPE_PP(ua_zval) == IS_STRING) {
		ua_str = Z_STRVAL_PP(ua_zval);
	} else if (FG(user_agent)) {
		ua_str = FG(user_agent);
	}

	if (ua_str) {
#define _UA_HEADER "User-Agent: %s\r\n"
		char *ua;
		size_t ua_len;
		
		ua_len = sizeof(_UA_HEADER) + strlen(ua_str);
		
		/* ensure the header is only sent if user_agent is not blank */
		if (ua_len > sizeof(_UA_HEADER)) {
			ua = emalloc(ua_len + 1);
			if ((ua_len = snprintf(ua, ua_len, _UA_HEADER, ua_str)) > 0) {
				ua[ua_len] = 0;
				php_stream_write(stream, ua, ua_len);
			} else {
				php_error_docref(NULL TSRMLS_CC, E_WARNING, "Cannot construct User-agent header");
			}

			if (ua) {
				efree(ua);
			}
		}	
	}