php/main/SAPI.c

/* 
   +----------------------------------------------------------------------+
   | PHP Version 4                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2002 The PHP Group                                |
   +----------------------------------------------------------------------+
   | This source file is subject to version 2.02 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available at through the world-wide-web at                           |
   | http://www.php.net/license/2_02.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.               |
   +----------------------------------------------------------------------+
   | Original design:  Shane Caraveo <shane@caraveo.com>                  |
   | Authors: Andi Gutmans <andi@zend.com>                                |
   |          Zeev Suraski <zeev@zend.com>                                |
   +----------------------------------------------------------------------+
*/

/* $Id$ */

#include <ctype.h>
#include <sys/stat.h>

#include "php.h"
#include "SAPI.h"
#include "ext/standard/php_string.h"
#include "ext/standard/pageinfo.h"
#if HAVE_PCRE || HAVE_BUNDLED_PCRE
#include "ext/pcre/php_pcre.h"
#endif
#ifdef ZTS
#include "TSRM.h"
#endif

#include "rfc1867.h"

#ifdef PHP_WIN32
#define STRCASECMP stricmp
#else
#define STRCASECMP strcasecmp
#endif

#include "php_content_types.h"

static HashTable known_post_content_types;

#ifdef ZTS
SAPI_API int sapi_globals_id;
#else
sapi_globals_struct sapi_globals;
#endif

static void sapi_globals_ctor(sapi_globals_struct *sapi_globals TSRMLS_DC)
{
	memset(sapi_globals, 0, sizeof(*sapi_globals));
}

/* True globals (no need for thread safety) */
SAPI_API sapi_module_struct sapi_module;


SAPI_API void sapi_startup(sapi_module_struct *sf)
{
	sapi_module = *sf;
	zend_hash_init_ex(&known_post_content_types, 5, NULL, NULL, 1, 0);

#ifdef ZTS
	ts_allocate_id(&sapi_globals_id, sizeof(sapi_globals_struct), (ts_allocate_ctor) sapi_globals_ctor, NULL);
#else
	sapi_globals_ctor(&sapi_globals TSRMLS_CC);
#endif

#ifdef VIRTUAL_DIR
	virtual_cwd_startup(); /* Could use shutdown to free the main cwd but it would just slow it down for CGI */
#endif

#ifdef PHP_WIN32
	tsrm_win32_startup();
#endif

	reentrancy_startup();
}

SAPI_API void sapi_shutdown(void)
{
	reentrancy_shutdown();
#ifdef VIRTUAL_DIR
	virtual_cwd_shutdown();
#endif

#ifdef PHP_WIN32
	tsrm_win32_shutdown();
#endif

	zend_hash_destroy(&known_post_content_types);
}


SAPI_API void sapi_free_header(sapi_header_struct *sapi_header)
{
	efree(sapi_header->header);
}


SAPI_API void sapi_handle_post(void *arg TSRMLS_DC)
{
	if (SG(request_info).post_entry && SG(request_info).content_type_dup) {
		SG(request_info).post_entry->post_handler(SG(request_info).content_type_dup, arg TSRMLS_CC);
		if (SG(request_info).post_data) {
			efree(SG(request_info).post_data);
			SG(request_info).post_data = NULL;
		}
		efree(SG(request_info).content_type_dup);
		SG(request_info).content_type_dup = NULL;
	}
}

static void sapi_read_post_data(TSRMLS_D)
{
	sapi_post_entry *post_entry;
	uint content_type_length = strlen(SG(request_info).content_type);
	char *content_type = estrndup(SG(request_info).content_type, content_type_length);
	char *p;
	char oldchar=0;
	void (*post_reader_func)(TSRMLS_D);


	/* dedicated implementation for increased performance:
	 * - Make the content type lowercase
	 * - Trim descriptive data, stay with the content-type only
	 */
	for (p=content_type; p<content_type+content_type_length; p++) {
		switch (*p) {
			case ';':
			case ',':
			case ' ':
				content_type_length = p-content_type;
				oldchar = *p;
				*p = 0;
				break;
			default:
				*p = tolower(*p);
				break;
		}
	}

	if (zend_hash_find(&known_post_content_types, content_type, content_type_length+1, (void **) &post_entry)==SUCCESS) {
		SG(request_info).post_entry = post_entry;
		post_reader_func = post_entry->post_reader;
	} else {
		if (!sapi_module.default_post_reader) {
			sapi_module.sapi_error(E_WARNING, "Unsupported content type:  '%s'", content_type);
			return;
		}
		SG(request_info).post_entry = NULL;
		post_reader_func = sapi_module.default_post_reader;
	}
	if (oldchar) {
		*(p-1) = oldchar;
	}

	SG(request_info).content_type_dup = content_type;

	if(post_reader_func) {
		post_reader_func(TSRMLS_C);

		if(PG(always_populate_raw_post_data) && sapi_module.default_post_reader) {
			sapi_module.default_post_reader(TSRMLS_C);
		}
	}
}


SAPI_API SAPI_POST_READER_FUNC(sapi_read_standard_form_data)
{
	int read_bytes;
	int allocated_bytes=SAPI_POST_BLOCK_SIZE+1;

	if (SG(request_info).content_length > SG(post_max_size)) {
		php_error(E_WARNING, "POST Content-Length of %d bytes exceeds the limit of %d bytes",
					SG(request_info).content_length, SG(post_max_size));
		return;
	}
	SG(request_info).post_data = emalloc(allocated_bytes);

	for (;;) {
		read_bytes = sapi_module.read_post(SG(request_info).post_data+SG(read_post_bytes), SAPI_POST_BLOCK_SIZE TSRMLS_CC);
		if (read_bytes<=0) {
			break;
		}
		SG(read_post_bytes) += read_bytes;
		if (SG(read_post_bytes) > SG(post_max_size)) {
			php_error(E_WARNING, "Actual POST length does not match Content-Length, and exceeds %d bytes", SG(post_max_size));
			return;
		}
		if (read_bytes < SAPI_POST_BLOCK_SIZE) {
			break;
		}
		if (SG(read_post_bytes)+SAPI_POST_BLOCK_SIZE >= allocated_bytes) {
			allocated_bytes = SG(read_post_bytes)+SAPI_POST_BLOCK_SIZE+1;
			SG(request_info).post_data = erealloc(SG(request_info).post_data, allocated_bytes);
		}
	}
	SG(request_info).post_data[SG(read_post_bytes)] = 0;  /* terminating NULL */
	SG(request_info).post_data_length = SG(read_post_bytes);
}


SAPI_API char *sapi_get_default_content_type(TSRMLS_D)
{
	char *mimetype, *charset, *content_type;

	mimetype = SG(default_mimetype) ? SG(default_mimetype) : SAPI_DEFAULT_MIMETYPE;
	charset = SG(default_charset) ? SG(default_charset) : SAPI_DEFAULT_CHARSET;

	if (strncasecmp(mimetype, "text/", 5) == 0 && *charset) {
		int len = strlen(mimetype) + sizeof("; charset=") + strlen(charset);
		content_type = emalloc(len);
		snprintf(content_type, len, "%s; charset=%s", mimetype, charset);
	} else {
		content_type = estrdup(mimetype);
	}
	return content_type;
}


SAPI_API void sapi_get_default_content_type_header(sapi_header_struct *default_header TSRMLS_DC)
{
	char *default_content_type = sapi_get_default_content_type(TSRMLS_C);
	int default_content_type_len = strlen(default_content_type);

	default_header->header_len = (sizeof("Content-type: ")-1) + default_content_type_len;
	default_header->header = emalloc(default_header->header_len+1);
	memcpy(default_header->header, "Content-type: ", sizeof("Content-type: "));
	memcpy(default_header->header+sizeof("Content-type: ")-1, default_content_type, default_content_type_len);
	default_header->header[default_header->header_len] = 0;
	efree(default_content_type);
}

/*
 * Add charset on content-type header if the MIME type starts with
 * "text/", the default_charset directive is not empty and
 * there is not already a charset option in there.
 *
 * If "mimetype" is non-NULL, it should point to a pointer allocated
 * with emalloc().  If a charset is added, the string will be
 * re-allocated and the new length is returned.  If mimetype is
 * unchanged, 0 is returned.
 *
 */
SAPI_API size_t sapi_apply_default_charset(char **mimetype, size_t len TSRMLS_DC)
{
	char *charset, *newtype;
	size_t newlen;
	charset = SG(default_charset) ? SG(default_charset) : SAPI_DEFAULT_CHARSET;

	if (*charset && strncmp(*mimetype, "text/", 5) == 0 && strstr(*mimetype, "charset=") == NULL) {
		newlen = len + (sizeof(";charset=")-1) + strlen(charset);
		newtype = emalloc(newlen + 1);
 		PHP_STRLCPY(newtype, *mimetype, newlen + 1, len);
		strlcat(newtype, ";charset=", newlen + 1);
		if (*mimetype != NULL) {
			efree(*mimetype);
		}
		*mimetype = newtype;
		return newlen;
	}
	return 0;
}


/*
 * Called from php_request_startup() for every request.
 */
SAPI_API void sapi_activate(TSRMLS_D)
{
	void (*post_reader_func)(TSRMLS_D);
	zend_llist_init(&SG(sapi_headers).headers, sizeof(sapi_header_struct), (void (*)(void *)) sapi_free_header, 0);
	SG(sapi_headers).send_default_content_type = 1;

	/*
	SG(sapi_headers).http_response_code = 200;
	*/
	SG(sapi_headers).http_status_line = NULL;
	SG(headers_sent) = 0;
	SG(read_post_bytes) = 0;
	SG(request_info).post_data = NULL;
	SG(request_info).current_user = NULL;
	SG(request_info).current_user_length = 0;
	SG(request_info).no_headers = 0;

	/* It's possible to override this general case in the activate() callback, if
	 * necessary.
	 */
	if (SG(request_info).request_method && !strcmp(SG(request_info).request_method, "HEAD")) {
		SG(request_info).headers_only = 1;
	} else {
		SG(request_info).headers_only = 0;
	}
	SG(rfc1867_uploaded_files) = NULL;

	if (SG(server_context)) {
		if (SG(request_info).request_method 
			&& !strcmp(SG(request_info).request_method, "POST")) {
			if (!SG(request_info).content_type) {
				SG(request_info).content_type_dup = NULL;
				if(PG(always_populate_raw_post_data)) {
					SG(request_info).post_entry = NULL;
					post_reader_func = sapi_module.default_post_reader;

					if(post_reader_func) {
						post_reader_func(TSRMLS_C);

						if(PG(always_populate_raw_post_data) && sapi_module.default_post_reader) {
							sapi_module.default_post_reader(TSRMLS_C);
						}
					}
				} else {
					sapi_module.sapi_error(E_WARNING, "No content-type in POST request");
				}
			} else {
				sapi_read_post_data(TSRMLS_C);
			}
		} else {
			SG(request_info).content_type_dup = NULL;
		}
		SG(request_info).cookie_data = sapi_module.read_cookies(TSRMLS_C);
		if (sapi_module.activate) {
			sapi_module.activate(TSRMLS_C);
		}
	}
}


SAPI_API void sapi_deactivate(TSRMLS_D)
{
	zend_llist_destroy(&SG(sapi_headers).headers);
	if (SG(request_info).post_data) {
		efree(SG(request_info).post_data);
	}
	if (SG(request_info).auth_user) {
		efree(SG(request_info).auth_user);
	}
	if (SG(request_info).auth_password) {
		efree(SG(request_info).auth_password);
	}
	if (SG(request_info).content_type_dup) {
		efree(SG(request_info).content_type_dup);
	}
	if (SG(request_info).current_user) {
		efree(SG(request_info).current_user);
	}
	if (sapi_module.deactivate) {
		sapi_module.deactivate(TSRMLS_C);
	}
	if (SG(rfc1867_uploaded_files)) {
		destroy_uploaded_files_hash(TSRMLS_C);
	}
}


SAPI_API void sapi_initialize_empty_request(TSRMLS_D)
{
	SG(server_context) = NULL;
	SG(request_info).request_method = NULL;
	SG(request_info).auth_user = SG(request_info).auth_password = NULL;
	SG(request_info).content_type_dup = NULL;
}


static int sapi_extract_response_code(const char *header_line)
{
	int code = 200;
	const char *ptr;

	for (ptr = header_line; *ptr; ptr++) {
		if (*ptr == ' ' && *(ptr + 1) != ' ') {
			code = atoi(ptr + 1);
			break;
		}
	}
	
	return code;
}

/* This function expects a *duplicated* string, that was previously emalloc()'d.
 * Pointers sent to this functions will be automatically freed by the framework.
 */
SAPI_API int sapi_add_header_ex(char *header_line, uint header_line_len, zend_bool duplicate, zend_bool replace TSRMLS_DC)
{
	int retval, free_header = 0;
	sapi_header_struct sapi_header;
	char *colon_offset;
	long myuid = 0L;

	if (SG(headers_sent) && !SG(request_info).no_headers) {
		char *output_start_filename = php_get_output_start_filename(TSRMLS_C);
		int output_start_lineno = php_get_output_start_lineno(TSRMLS_C);

		if (output_start_filename) {
			sapi_module.sapi_error(E_WARNING, "Cannot add header information - headers already sent by (output started at %s:%d)",
				output_start_filename, output_start_lineno);
		} else {
			sapi_module.sapi_error(E_WARNING, "Cannot add header information - headers already sent");
		}
		if (!duplicate) {
			efree(header_line);
		}
		return FAILURE;
	}

	if (duplicate) {
		header_line = estrndup(header_line, header_line_len);
	}

	/* cut of trailing spaces, linefeeds and carriage-returns */
	while(isspace(header_line[header_line_len-1])) 
		  header_line[--header_line_len]='\0';
	

	sapi_header.header = header_line;
	sapi_header.header_len = header_line_len;
	sapi_header.replace = replace;

	/* Check the header for a few cases that we have special support for in SAPI */
	if (header_line_len>=5 
		&& !strncasecmp(header_line, "HTTP/", 5)) {
		/* filter out the response code */
		SG(sapi_headers).http_response_code = sapi_extract_response_code(header_line);
		SG(sapi_headers).http_status_line = header_line;
		return SUCCESS;
	} else {
		colon_offset = strchr(header_line, ':');
		if (colon_offset) {
			*colon_offset = 0;
			if (!STRCASECMP(header_line, "Content-Type")) {
				char *ptr = colon_offset, *mimetype = NULL, *newheader;
				size_t len = header_line_len - (ptr - header_line), newlen;
				while (*ptr == ' ' && *ptr != '\0') {
					ptr++;
				}
				mimetype = estrdup(ptr);
				newlen = sapi_apply_default_charset(&mimetype, len TSRMLS_CC);
				if (newlen != 0) {
					newlen += sizeof("Content-type: ");
					newheader = emalloc(newlen);
					PHP_STRLCPY(newheader, "Content-type: ", newlen, sizeof("Content-type: ")-1);
					strlcat(newheader, mimetype, newlen);
					sapi_header.header = newheader;
					sapi_header.header_len = newlen - 1;
					colon_offset = strchr(newheader, ':');
					*colon_offset = '\0';
					free_header = 1;
				}
				efree(mimetype);
				SG(sapi_headers).send_default_content_type = 0;
			} else if (!STRCASECMP(header_line, "Location")) {
			        if (SG(sapi_headers).http_response_code < 300 ||
				    SG(sapi_headers).http_response_code > 307) {
				   	/* Return a Found Redirect if one is not already specified */
					SG(sapi_headers).http_response_code = 302;
				   }
			} else if (!STRCASECMP(header_line, "WWW-Authenticate")) { /* HTTP Authentication */
				int newlen;
				char *result, *newheader;
#if HAVE_PCRE || HAVE_BUNDLED_PCRE
				zval *repl_temp;
				char *ptr = colon_offset+1;
				int ptr_len=0, result_len = 0;
#endif

				SG(sapi_headers).http_response_code = 401; /* authentication-required */
#if HAVE_PCRE || HAVE_BUNDLED_PCRE
				if(PG(safe_mode)) {
					myuid = php_getuid();

					ptr_len = strlen(ptr);
					MAKE_STD_ZVAL(repl_temp);
					Z_TYPE_P(repl_temp) = IS_STRING;
					Z_STRVAL_P(repl_temp) = emalloc(32);
					Z_STRLEN_P(repl_temp) = sprintf(Z_STRVAL_P(repl_temp), "realm=\"\\1-%ld\"", myuid);
					/* Modify quoted realm value */
					result = php_pcre_replace("/realm=\"(.*?)\"/i", 16,
											 ptr, ptr_len,
											 repl_temp,
											 0, &result_len, -1 TSRMLS_CC);
					if(result_len==ptr_len) {
						efree(result);
						sprintf(Z_STRVAL_P(repl_temp), "realm=\\1-%ld\\2", myuid);
						/* modify unquoted realm value */
						result = php_pcre_replace("/realm=([^\\s]+)(.*)/i", 21, 
											 	ptr, ptr_len,
											 	repl_temp,
											 	0, &result_len, -1 TSRMLS_CC);
						if(result_len==ptr_len) {
							char *lower_temp = estrdup(ptr);	
							char conv_temp[32];
							int conv_len;

							php_strtolower(lower_temp,strlen(lower_temp));
							/* If there is no realm string at all, append one */
							if(!strstr(lower_temp,"realm")) {
								efree(result);
								conv_len = sprintf(conv_temp," realm=\"%ld\"",myuid);		
								result = emalloc(ptr_len+conv_len+1);
								result_len = ptr_len+conv_len;
								memcpy(result, ptr, ptr_len);	
								memcpy(result+ptr_len, conv_temp, conv_len);
								*(result+ptr_len+conv_len) = '\0';
							}
							efree(lower_temp);
						}
					}
					newlen = sizeof("WWW-Authenticate: ") + result_len;
					newheader = emalloc(newlen+1);
					sprintf(newheader,"WWW-Authenticate: %s", result);
					efree(header_line);
					sapi_header.header = newheader;
					sapi_header.header_len = newlen;
					efree(result);
					efree(Z_STRVAL_P(repl_temp));
					efree(repl_temp);
				} 
#else
				if(PG(safe_mode)) {
					myuid = php_getuid();
					result = emalloc(32);
					newlen = sprintf(result, "WWW-Authenticate: %ld", myuid);	
					newheader = estrndup(result,newlen);
					efree(header_line);
					sapi_header.header = newheader;
					sapi_header.header_len = newlen;
					efree(result);
				} 
#endif
			}
			if (sapi_header.header==header_line) {
				*colon_offset = ':';
			}
		}
	}

	if (sapi_module.header_handler) {
		retval = sapi_module.header_handler(&sapi_header, &SG(sapi_headers) TSRMLS_CC);
	} else {
		retval = SAPI_HEADER_ADD;
	}
	if (retval & SAPI_HEADER_DELETE_ALL) {
		zend_llist_clean(&SG(sapi_headers).headers);
	}
	if (retval & SAPI_HEADER_ADD) {
		zend_llist_add_element(&SG(sapi_headers).headers, (void *) &sapi_header);
	}
	if (free_header) {
		efree(sapi_header.header);
	}
	return SUCCESS;
}


SAPI_API int sapi_send_headers(TSRMLS_D)
{
	int retval;
	int ret = FAILURE;

	if (SG(headers_sent) || SG(request_info).no_headers) {
		return SUCCESS;
	}

	/* Success-oriented.  We set headers_sent to 1 here to avoid an infinite loop
	 * in case of an error situation.
	 */
	SG(headers_sent) = 1;

	if (sapi_module.send_headers) {
		retval = sapi_module.send_headers(&SG(sapi_headers) TSRMLS_CC);
	} else {
		retval = SAPI_HEADER_DO_SEND;
	}

	switch (retval) {
		case SAPI_HEADER_SENT_SUCCESSFULLY:
			ret = SUCCESS;
			break;
		case SAPI_HEADER_DO_SEND:
			if (SG(sapi_headers).http_status_line) {
				sapi_header_struct http_status_line;

				http_status_line.header = SG(sapi_headers).http_status_line;
				http_status_line.header_len = strlen(SG(sapi_headers).http_status_line);
				sapi_module.send_header(&http_status_line, SG(server_context) TSRMLS_CC);
			}
			zend_llist_apply_with_argument(&SG(sapi_headers).headers, (llist_apply_with_arg_func_t) sapi_module.send_header, SG(server_context) TSRMLS_CC);
			if(SG(sapi_headers).send_default_content_type) {
				sapi_header_struct default_header;

				sapi_get_default_content_type_header(&default_header TSRMLS_CC);
				sapi_module.send_header(&default_header, SG(server_context) TSRMLS_CC);
				sapi_free_header(&default_header);
			}
			sapi_module.send_header(NULL, SG(server_context) TSRMLS_CC);
			ret = SUCCESS;
			break;
		case SAPI_HEADER_SEND_FAILED:
			SG(headers_sent) = 0;
			ret = FAILURE;
			break;
	}
	
	if (SG(sapi_headers).http_status_line) {
		efree(SG(sapi_headers).http_status_line);
	}
	
	return ret;
}


SAPI_API int sapi_register_post_entries(sapi_post_entry *post_entries)
{
	sapi_post_entry *p=post_entries;

	while (p->content_type) {
		if (sapi_register_post_entry(p)==FAILURE) {
			return FAILURE;
		}
		p++;
	}
	return SUCCESS;
}


SAPI_API int sapi_register_post_entry(sapi_post_entry *post_entry)
{
	return zend_hash_add(&known_post_content_types, post_entry->content_type, post_entry->content_type_len+1, (void *) post_entry, sizeof(sapi_post_entry), NULL);
}

SAPI_API void sapi_unregister_post_entry(sapi_post_entry *post_entry)
{
	zend_hash_del(&known_post_content_types, post_entry->content_type, post_entry->content_type_len+1);
}


SAPI_API int sapi_register_default_post_reader(void (*default_post_reader)(TSRMLS_D))
{
	sapi_module.default_post_reader = default_post_reader;
	return SUCCESS;
}


SAPI_API int sapi_flush(TSRMLS_D)
{
	if (sapi_module.flush) {
		sapi_module.flush(SG(server_context));
		return SUCCESS;
	} else {
		return FAILURE;
	}
}

SAPI_API struct stat *sapi_get_stat(TSRMLS_D)
{
	if (sapi_module.get_stat) {
		return sapi_module.get_stat(TSRMLS_C);
	} else {
		if (!SG(request_info).path_translated || (VCWD_STAT(SG(request_info).path_translated, &SG(global_stat))==-1)) {
			return NULL;
		}
		return &SG(global_stat);
	}
}


SAPI_API char *sapi_getenv(char *name, size_t name_len TSRMLS_DC)
{
	if (sapi_module.getenv) {
		return sapi_module.getenv(name, name_len TSRMLS_CC);
	} else {
		return NULL;
	}
}

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 * vim600: sw=4 ts=4 fdm=marker
 * vim<600: sw=4 ts=4
 */