--- parser3/src/targets/cgi/parser3.C	2001/04/28 15:22:47	1.76
+++ parser3/src/targets/cgi/parser3.C	2020/11/13 23:35:53	1.314
@@ -1,320 +1,634 @@
 /** @file
 	Parser: scripting and CGI main.
 
-	Copyright(c) 2001 ArtLebedev Group(http://www.artlebedev.com)
-
-	Author: Alexander Petrosyan <paf@design.ru>(http://design.ru/paf)
-
-	$Id: parser3.C,v 1.76 2001/04/28 15:22:47 paf Exp $
+	Copyright (c) 2001-2017 Art. Lebedev Studio (http://www.artlebedev.com)
+	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
 */
 
-#include "pa_config_includes.h"
+volatile const char * IDENT_PARSER3_C="$Id: parser3.C,v 1.314 2020/11/13 23:35:53 moko Exp $";
 
-#ifdef WIN32
-#	include <windows.h>
-#endif
+#include "pa_config_includes.h"
 
 #include "pa_sapi.h"
 #include "classes.h"
 #include "pa_common.h"
 #include "pa_request.h"
-#include "pa_socks.h"
 #include "pa_version.h"
+#include "pa_vconsole.h"
+#include "pa_sapi_info.h"
 
-/// IIS refuses to read bigger chunks
-const size_t READ_POST_CHUNK_SIZE=0x400*0x400; // 1M 
+#ifdef _MSC_VER
+#include <crtdbg.h>
+#include <windows.h>
+#include <direct.h>
+#endif
 
-const char *argv0;
-Pool pool(0); // global pool [dont describe to doxygen: it confuses it with param names]
-bool cgi; ///< we were started as CGI?
+// defines
 
-#ifdef WIN32
-/// global system errors into parser exceptions converter
-static LONG WINAPI TopLevelExceptionFilter(struct _EXCEPTION_POINTERS *ExceptionInfo) {
-	char buf[MAX_STRING];
-	if(ExceptionInfo && ExceptionInfo->ExceptionRecord) {
-		struct _EXCEPTION_RECORD *er=ExceptionInfo->ExceptionRecord;
-		snprintf(buf, MAX_STRING, "Exception 0x%X at %p", 
-			er->ExceptionCode, 
-			er->ExceptionAddress);
-	} else 
-		strcpy(buf, "Exception <unknown>");
-	
-	PTHROW(0, 0,
-		0,
-		buf);
+// comment remove me after debugging
+//#define PA_DEBUG_CGI_ENTRY_EXIT "parser3-debug.log"
 
-	return EXCEPTION_EXECUTE_HANDLER; // never reached
-}
+#if defined(_MSC_VER) && !defined(_DEBUG)
+#	define PA_SUPPRESS_SYSTEM_EXCEPTION
 #endif
 
+// consts
+
+#define REDIRECT_PREFIX "REDIRECT_"
+#define PARSER_CONFIG_ENV_NAME "CGI_PARSER_CONFIG"
+#define PARSER_LOG_ENV_NAME "CGI_PARSER_LOG"
+
+static const char* filespec_to_process=0; // [file]
+static const char* config_filespec=0; // -f option or next to the executable
+static const char* httpd_host_port=0; // -p option
+static bool mail_received=false; // -m option? [asked to parse incoming message to $mail:received]
+
+static char** argv_all = NULL;
+
+static bool cgi; ///< we were started as CGI?
+
+// for signal handlers
+Request *request=0;
+
+// for die error logging
+static Request_info request_info;
+
 // SAPI
-// appends to parser3.log located beside my binary
-void SAPI::log(Pool& pool, const char *fmt, ...) {
-	bool opened;
+
+static void log(const char* fmt, va_list args) {
+	bool opened=false;
 	FILE *f=0;
 
-	if(argv0) {
-		// beside by binary
+	const char* log_by_env=getenv(PARSER_LOG_ENV_NAME);
+	if(!log_by_env)
+		log_by_env=getenv(REDIRECT_PREFIX PARSER_LOG_ENV_NAME);
+	if(log_by_env) {
+		f=fopen(log_by_env, "at");
+		opened=f!=0;
+	}
+#ifdef PA_DEBUG_CGI_ENTRY_EXIT
+	f=fopen(PA_DEBUG_CGI_ENTRY_EXIT, "at");
+	opened=f!=0;
+#endif
+
+	if(!opened && config_filespec) {
+		char beside_config_path[MAX_STRING];
+		strncpy(beside_config_path, config_filespec, MAX_STRING-1);  beside_config_path[MAX_STRING-1]=0;
+		if(!(rsplit(beside_config_path, '/') || rsplit(beside_config_path, '\\'))) { // strip filename
+			// no path, just filename
+			beside_config_path[0]='.'; beside_config_path[1]=0;
+		}
+
 		char file_spec[MAX_STRING];
-		strncpy(file_spec, argv0, MAX_STRING);  // filespec of my binary
-		rsplit(file_spec, '/');  rsplit(file_spec, '\\');// strip filename
-		strcat(file_spec, "/parser3.log");
+		snprintf(file_spec, MAX_STRING, "%s/parser3.log", beside_config_path);
 		f=fopen(file_spec, "at");
+		opened=f!=0;
 	}
-	opened=f!=0;
+	// fallback to stderr
 	if(!opened)
 		f=stderr;
 
+	// use no memory [so that we could log out-of-memory error]
+	setbuf(f, 0); // stderr stream is unbuffered by default, but still...
+
 	// prefix
 	time_t t=time(0);
-	const char *stamp=ctime(&t);
-	fprintf(f, "[%.*s] ", strlen(stamp)-1, stamp);
+	if(const char* stamp=ctime(&t)) { // never saw that
+		if(size_t len=strlen(stamp)) // saw once stamp being =""
+			fprintf(f, "[%.*s] [%u] ", (int)len-1, stamp, (unsigned int)getpid() );
+	}
 	// message
-    va_list args;
-	va_start(args,fmt);
-	vfprintf(f, fmt, args);
-	va_end(args);
-	// newline
-	fprintf(f, "\n");
+
+	char buf[MAX_LOG_STRING];
+	size_t size=vsnprintf(buf, MAX_LOG_STRING, fmt, args);
+	size=remove_crlf(buf, buf+size);
+	fwrite(buf, size, 1, f);
+
+	if(request_info.method) {
+		fprintf(f, " [uri=%s, method=%s, cl=%lu]\n", request_info.uri ? request_info.uri : "<unknown>", request_info.method, (unsigned long)request_info.content_length);
+	} else
+		fputs(" [no request info]\n", f);
 
 	if(opened)
 		fclose(f);
+	else
+		fflush(f);
 }
 
-const char *SAPI::get_env(Pool& pool, const char *name) {
- 	return getenv(name);
+#ifdef PA_DEBUG_CGI_ENTRY_EXIT
+static void log(const char* fmt, ...) {
+	va_list args;
+	va_start(args,fmt);
+	log(fmt, args);
+	va_end(args);
+}
+#endif
+
+// appends to parser3.log located next to the executable if openable, to stderr otherwize
+void SAPI::log(SAPI_Info&, const char* fmt, ...) {
+	va_list args;
+	va_start(args,fmt);
+	::log(fmt, args);
+	va_end(args);
 }
 
-size_t SAPI::read_post(Pool& pool, char *buf, size_t max_bytes) {
-	size_t read_size=0;
-	do {
-		int chunk_size=read(fileno(stdin), 
-			buf+read_size, min(READ_POST_CHUNK_SIZE, max_bytes-read_size));
-		if(chunk_size<0)
-			break;
-		read_size+=chunk_size;
-	} while(read_size<max_bytes);
+void SAPI::die(const char* fmt, ...) {
+	va_list args;
 
-	return read_size;
+	// logging first, first vsnprintf
+	va_start(args,fmt);
+	::log(fmt, args);
+	va_end(args);
+
+	// inform user, second vsnprintf
+	va_start(args, fmt);
+	char message[MAX_STRING];
+	vsnprintf(message, MAX_STRING, fmt, args);
+
+	SAPI::send_error(*sapiInfo, message);
+	exit(1);
+//	va_end(args);
 }
 
-void SAPI::add_header_attribute(Pool& pool, const char *key, const char *value) {
-	if(cgi)
-		printf("%s: %s\n", key, value);
+char* SAPI::Env::get(SAPI_Info& info, const char* name) {
+	return info.get_env(name);
 }
 
-/// @todo intelligent cache-control
-void SAPI::send_header(Pool& pool) {
-	if(cgi) {
-		puts("expires: Fri, 23 Mar 2001 09:32:23 GMT");
+bool SAPI::Env::set(SAPI_Info& info, const char* name, const char* value) {
+	return info.set_env(name, value);
+}
 
-		// header | body  delimiter
-		puts("");
-	}
+const char* const *SAPI::Env::get(SAPI_Info& info) {
+	return info.get_env();
 }
 
-void SAPI::send_body(Pool& pool, const void *buf, size_t size) {
-	stdout_write(buf, size);
+size_t SAPI::read_post(SAPI_Info& info, char *buf, size_t max_bytes) {
+	return info.read_post(buf, max_bytes);
 }
 
-/**
-	main workhorse
+void SAPI::add_header_attribute(SAPI_Info& info, const char* dont_store_key, const char* dont_store_value) {
+	info.add_header_attribute(dont_store_key, dont_store_value);
+}
 
-	@todo 
-		IIS: remove trailing default-document[index.html] from $request.uri.
-		to do that we need to consult metabase,
-		wich is tested but seems slow.
-*/
-int main(int argc, char *argv[]) {
-	argv0=argv[0];
+void SAPI::send_header(SAPI_Info& info) {
+	info.send_header();
+}
 
-	umask(2);
+size_t SAPI::send_body(SAPI_Info& info, const void *buf, size_t size) {
+	return info.send_body(buf, size);
+}
 
+static void full_disk_path(const char* file_name, char *buf, size_t buf_size) {
+	if(file_name[0]=='/' 
 #ifdef WIN32
-	setmode(fileno(stdin), _O_BINARY);
-	setmode(fileno(stdout), _O_BINARY);
-	setmode(fileno(stderr), _O_BINARY);
+		|| file_name[0] && file_name[1]==':'
 #endif
-
-	// were we started as CGI?
-	cgi=
-		getenv("SERVER_SOFTWARE") || 
-		getenv("SERVER_NAME") || 
-		getenv("GATEWAY_INTERFACE") || 
-		getenv("REQUEST_METHOD");
-	
-	if(!cgi) {
-		if(argc<2) {
-			printf(
-				"Parser/%s Copyright(c) 2001 ArtLebedev Group(http://www.artlebedev.com)\n"
-				"Author: Alexander Petrosyan <paf@design.ru>(http://design.ru/paf)\n"
-				"\n"
-				"Usage: %s <file>\n",
-				PARSER_VERSION, 
-				argv0?argv0:"parser3");
-			return 1;
-		}
+	){
+		strncpy(buf, file_name, buf_size-1); buf[buf_size-1]=0;
+	} else {
+		char cwd[MAX_STRING];
+		snprintf(buf, buf_size, "%s/%s", getcwd(cwd, MAX_STRING) ? cwd : "", file_name);
 	}
-
-	char *filespec_to_process=cgi?getenv("PATH_TRANSLATED"):argv[1];
 #ifdef WIN32
-	back_slashes_to_slashes(filespec_to_process);
+	back_slashes_to_slashes(buf);
+#endif
+}
+
+static void log_signal(const char* signal_name) {
+	SAPI::log(*sapiInfo, "%s received %s processing request", signal_name, request ? "while" : "before or after");
+}
+
+#ifdef SIGUSR1
+static void SIGUSR1_handler(int /*sig*/){
+	log_signal("SIGUSR1");
+}
+#endif
+
+#ifdef SIGPIPE
+#define SIGPIPE_NAME "SIGPIPE"
+static const String sigpipe_name(SIGPIPE_NAME);
+static void SIGPIPE_handler(int /*sig*/){
+	Value* sigpipe=0;
+	if(request)
+		sigpipe=request->main_class.get_element(sigpipe_name);
+	if(sigpipe && sigpipe->as_bool())
+		log_signal(SIGPIPE_NAME);
+
+	if(request)
+		request->set_skip(Request::SKIP_INTERRUPTED);
+}
 #endif
 
-	const char *request_method=getenv("REQUEST_METHOD");
-	bool header_only=request_method && strcasecmp(request_method, "HEAD")==0;
-	PTRY { // global try
-		// must be first in PTRY{}PCATCH
 #ifdef WIN32
-		SetUnhandledExceptionFilter(&TopLevelExceptionFilter);
+const char* maybe_reconstruct_IIS_status_in_qs(const char* original) {
+	// 404;http://servername/page[?param=value...]
+	// ';' should be urlencoded by HTTP standard, so we shouldn't get it from browser 
+	// and can consider that as an indication that this is IIS way to report errors
+
+	if(original && isdigit((unsigned char)original[0]) && isdigit((unsigned char)original[1]) && isdigit((unsigned char)original[2]) && original[3]==';'){
+		size_t original_len=strlen(original);
+		char* reconstructed=new(PointerFreeGC) char[original_len +12/*IIS-STATUS=&*/ +14/*IIS-DOCUMENT=&*/ +1];
+		char* cur=reconstructed;
+		memcpy(cur, "IIS-STATUS=", 11);	 cur+=11;
+		memcpy(cur, original, 3); cur+=3;
+		*cur++='&';
+
+		const char* qmark_at=strchr(original, '?');
+		memcpy(cur, "IIS-DOCUMENT=", 13);  cur+=13;
+		{
+			size_t value_len=(qmark_at ? qmark_at-original : original_len)-4;
+			memcpy(cur, original+4, value_len);  cur+=value_len;
+		}
+
+		if(qmark_at) {
+			*cur++='&';
+			strcpy(cur, qmark_at+1/*skip ? itself*/);
+		} else
+			*cur=0;
+
+		return reconstructed;
+	}
+	
+	return original;
+}
+
+#define MAYBE_RECONSTRUCT_IIS_STATUS_IN_QS(s) maybe_reconstruct_IIS_status_in_qs(s)
+#else 
+#define MAYBE_RECONSTRUCT_IIS_STATUS_IN_QS(s) s
 #endif
 
-		// init socks
-		init_socks(pool);
 
-		// init global classes
-		init_methoded_array(pool);
-		// init global variables
-		pa_globals_init(pool);
-
-		if(!filespec_to_process)
-			PTHROW(0, 0,
-				0,
-				"Parser/%s", PARSER_VERSION);
-
-		// Request info
-		Request::Info request_info;
-		if(cgi) {
-			if(const char *env_document_root=SAPI::get_env(pool, "DOCUMENT_ROOT"))
-				request_info.document_root=env_document_root;
-			else if(const char *path_info=SAPI::get_env(pool, "PATH_INFO")) {
-				// IIS
-				size_t len=strlen(filespec_to_process)-strlen(path_info);
-				char *buf=(char *)pool.malloc(len+1);
-				strncpy(buf, filespec_to_process, len);
-				buf[len]=0;
-				request_info.document_root=buf;
+class RequestController {
+public:
+	RequestController(Request* r){
+		::request=r;
+	}
+	~RequestController(){
+		::request=0;
+	}
+};
+
+static void connection_handler(SAPI_Info_HTTPD &info, HTTPD_Connection &connection){
+	connection.read_header();
+	info.populate_env();
+
+	// connection request info, still global for correct log() reporting
+	memset(&request_info, 0, sizeof(request_info));
+
+	char document_root_buf[MAX_STRING];
+	full_disk_path("", document_root_buf, sizeof(document_root_buf));
+	request_info.document_root = document_root_buf;
+	request_info.path_translated = filespec_to_process;
+	request_info.method = connection.method();
+	request_info.query_string = connection.query();
+	request_info.uri = request_info.strip_absolute_uri(connection.uri());
+	request_info.content_type = connection.content_type();
+	request_info.content_length = connection.content_length();
+	request_info.cookie = info.get_env("HTTP_COOKIE");
+	request_info.mail_received = false;
+	request_info.argv = argv_all;
+
+	// prepare to process request
+	Request request(info, request_info, String::Language(String::L_HTML|String::L_OPTIMIZE_BIT));
+	{
+		// initing ::request ptr for signal handlers
+		RequestController rc(&request);
+		// process the request
+		request.core(config_filespec, strcasecmp(request_info.method, "HEAD")==0, String("httpd-main"));
+		// clearing ::request in RequestController desctructor to prevent signal handlers from accessing invalid memory
+	}
+}
+
+static void httpd_mode(){
+	int sock = HTTPD_Server::bind(httpd_host_port);
+
+	while(1){
+		try {
+			HTTPD_Connection connection;
+			if(!connection.accept(sock, 5))
+				continue;
+
+			SAPI_Info_HTTPD info(connection);
+
+			try { // connection try
+				connection_handler(info, connection);
+			} catch(const Exception& e) { // exception in connection handling or unhandled exception
+				SAPI::log(info, "%s", e.comment());
+				SAPI::send_error(info, e.comment(), info.exception_http_status(e.type()));
+			}
+			// closing connection socket in HTTPD_Connection destructor
+		} catch(const Exception& e) { // exception in accept or send_error
+			SAPI::log(*sapiInfo, "%s", e.comment());
+		}
+	}
+}
+
+/** main workhorse */
+
+static void real_parser_handler() {
+	// init libraries
+	pa_globals_init();
+
+	if(httpd_host_port){
+		httpd_mode();
+	}
+
+	const char* request_method=getenv("REQUEST_METHOD");
+
+	if(!filespec_to_process)
+		SAPI::die("Parser/%s", PARSER_VERSION);
+	
+	char document_root_buf[MAX_STRING];
+
+	// global request info
+	request_info.path_translated = filespec_to_process;
+	request_info.method = request_method ? request_method : "GET";
+	request_info.query_string = MAYBE_RECONSTRUCT_IIS_STATUS_IN_QS(getenv("QUERY_STRING"));
+
+	if(cgi) {
+		// obligatory
+		const char* path_info=getenv("PATH_INFO");
+		if(!path_info)
+			SAPI::die("CGI: illegal call (missing PATH_INFO)");
+		
+		request_info.document_root = getenv("DOCUMENT_ROOT");
+		if(!request_info.document_root) {
+			// IIS or fcgiwrap minimalistic setup
+			ssize_t prefix_len = strlen(filespec_to_process) - strlen(path_info);
+			if(prefix_len < 0 || strcmp(filespec_to_process + prefix_len, path_info) != 0)
+				SAPI::die("CGI: illegal call (invalid PATH_INFO in reinventing DOCUMENT_ROOT)");
+
+			char* document_root = new(PointerFreeGC) char[prefix_len + 1/*0*/];
+			memcpy(document_root, filespec_to_process, prefix_len); document_root[prefix_len] = 0;
+			request_info.document_root = document_root;
+		}
+
+		request_info.uri = request_info.strip_absolute_uri(getenv("REQUEST_URI"));
+		if(request_info.uri) { // apache & others stuck to standards
+			// another obligatory
+			const char* script_name = getenv("SCRIPT_NAME");
+			if(!script_name)
+				SAPI::die("CGI: illegal call (missing SCRIPT_NAME)");
+			/*
+				http://parser3/env.html?123  =OK
+				$request:uri=/env.html?123
+				REQUEST_URI='/env.html?123'
+				SCRIPT_NAME='/cgi-bin/parser3'
+				PATH_INFO='/env.html'
+				
+				http://parser3/cgi-bin/parser3/env.html?123 =ERROR
+				$request:uri=/cgi-bin/parser3/env.html?123
+				REQUEST_URI='/cgi-bin/parser3/env.html?123'
+				SCRIPT_NAME='/cgi-bin/parser3'
+				PATH_INFO='/env.html'
+			*/
+			size_t script_name_len = strlen(script_name);
+			size_t uri_len = strlen(request_info.uri);
+			if(strncmp(request_info.uri, script_name, script_name_len)==0 && script_name_len != uri_len) // under IIS they are the same
+				SAPI::die("CGI: illegal call (1)");
+		} else { // fcgiwrap minimalistic setup
+
+			if(request_info.query_string && *request_info.query_string) {
+				char* reconstructed_uri = new(PointerFreeGC) char[strlen(path_info) + 1/*'?'*/+ strlen(request_info.query_string) + 1/*0*/];
+				strcpy(reconstructed_uri, path_info);
+				strcat(reconstructed_uri, "?");
+				strcat(reconstructed_uri, request_info.query_string);
+				request_info.uri = reconstructed_uri;
 			} else
-				PTHROW(0, 0,
-					0,
-					"CGI: no PATH_INFO defined(in reinventing DOCUMENT_ROOT)");
-		} else {
-			static char buf[MAX_STRING];
-			strncpy(buf, filespec_to_process, MAX_STRING);
-			if(rsplit(buf, '/') || rsplit(buf, '\\')) // strip filename
-				request_info.document_root=buf;
-			else
-				request_info.document_root="";
+				request_info.uri = path_info;
 		}
-		request_info.path_translated=filespec_to_process;
-		request_info.method=request_method;
-		const char *query_string=SAPI::get_env(pool, "QUERY_STRING");
-		request_info.query_string=query_string;
-		if(cgi) {
-			if(const char *env_request_uri=SAPI::get_env(pool, "REQUEST_URI"))
-				request_info.uri=env_request_uri;
-			else if(const char *path_info=SAPI::get_env(pool, "PATH_INFO"))
-				if(query_string) {
-					char *reconstructed_uri=(char *)malloc(
-						strlen(path_info)+1/*'?'*/+
-						strlen(query_string)+1/*0*/);
-					strcpy(reconstructed_uri, path_info);
-					strcat(reconstructed_uri, "?");
-					strcat(reconstructed_uri, query_string);
-					request_info.uri=reconstructed_uri;
-				} else
-					request_info.uri=path_info;
+	} else{
+		full_disk_path("", document_root_buf, sizeof(document_root_buf));
+		request_info.document_root = document_root_buf;
+		request_info.uri = "";
+	}
+	
+	request_info.content_type = getenv("CONTENT_TYPE");
+	request_info.content_length = pa_atoul(getenv("CONTENT_LENGTH"));
+	request_info.cookie = getenv("HTTP_COOKIE");
+	request_info.mail_received = mail_received;
+
+	request_info.argv = argv_all;
+
+#ifdef PA_DEBUG_CGI_ENTRY_EXIT
+	log("request_info: method=%s, uri=%s, q=%s, dr=%s, pt=%s, cookies=%s, cl=%u",
+		request_info.method,
+		request_info.uri,
+		request_info.query_string,
+		request_info.document_root,
+		request_info.path_translated,
+		request_info.cookie,
+		request_info.content_length);
+#endif
+
+	// prepare to process request
+	Request request(*sapiInfo, request_info, cgi ? String::Language(String::L_HTML|String::L_OPTIMIZE_BIT) : String::L_AS_IS);
+	{
+		// initing ::request ptr for signal handlers
+		RequestController rc(&request);
+		// process the request
+		request.core(config_filespec, strcasecmp(request_info.method, "HEAD")==0);
+		// clearing ::request in RequestController destructor to prevent signal handlers from accessing invalid memory
+	}
+
+	// finalize libraries
+	pa_globals_done();
+}
+
+#ifdef PA_SUPPRESS_SYSTEM_EXCEPTION
+static const Exception call_real_parser_handler__do_PEH_return_it() {
+	try {
+		real_parser_handler();
+	} catch(const Exception& e) {
+		return e;
+	}
+
+	return Exception();
+}
+
+static void call_real_parser_handler__supress_system_exception() {
+	Exception parser_exception;
+	LPEXCEPTION_POINTERS system_exception=0;
+
+	__try {
+		parser_exception=call_real_parser_handler__do_PEH_return_it();
+	} __except ( (system_exception=GetExceptionInformation()), EXCEPTION_EXECUTE_HANDLER) {
+		if(system_exception)
+			if(_EXCEPTION_RECORD *er=system_exception->ExceptionRecord)
+				throw Exception("system", 0, "0x%08X at 0x%08X", er->ExceptionCode,  er->ExceptionAddress);
 			else
-				PTHROW(0, 0,
-					0,
-					"CGI: no PATH_INFO defined(in reinventing REQUEST_URI)");
-
-			if(const char *script_name=SAPI::get_env(pool, "SCRIPT_NAME")) {
-				size_t script_name_len=strlen(script_name);
-				size_t uri_len=strlen(request_info.uri);
-				if(strncmp(request_info.uri,script_name, script_name_len)==0 &&
-					script_name_len != uri_len) // under IIS they are the same
-					PTHROW(0, 0,
-						0,
-						"CGI: illegal call");
-			}
-		} else
-			request_info.uri=0;
+				throw Exception("system", 0, "<no exception record>");
+		else
+			throw Exception("system", 0, "<no exception information>");
+	}
 
-		request_info.content_type=SAPI::get_env(pool, "CONTENT_TYPE");
-		const char *content_length=SAPI::get_env(pool, "CONTENT_LENGTH");
-		request_info.content_length=(content_length?atoi(content_length):0);
-		request_info.cookie=SAPI::get_env(pool, "HTTP_COOKIE");
-		request_info.user_agent=SAPI::get_env(pool, "HTTP_USER_AGENT");
-
-		// prepare to process request
-		Request request(pool,
-			request_info,
-			cgi ? String::UL_USER_HTML : String::UL_AS_IS
-			);
-		
-		// some root-controlled location
-#ifdef WIN32
-		// c:\windows
-		static char root_auto_path[MAX_STRING];
-		GetWindowsDirectory(root_auto_path, MAX_STRING);
+	if(parser_exception)
+		throw Exception(parser_exception);
+}
+
+#define REAL_PARSER_HANDLER call_real_parser_handler__supress_system_exception
 #else
-		// ~nobody  todo: figure out a better place
-		const char *root_auto_path=SAPI::get_env(pool, "HOME");
+#define REAL_PARSER_HANDLER real_parser_handler
 #endif
-		
-		// beside by binary
-		static char site_auto_path[MAX_STRING];
-		strncpy(site_auto_path, argv[0], MAX_STRING);  // filespec of my binary
-		rsplit(site_auto_path, '/');  rsplit(site_auto_path, '\\');// strip filename
-		
-		// process the request
-		request.core(
-			root_auto_path, false,
-			site_auto_path, false,
-			header_only);
 
-		//
-		done_socks();
+static void usage(const char* program) {
+	printf(
+		"Parser/%s\n"
+		"Copyright (c) 2001-2017 Art. Lebedev Studio (http://www.artlebedev.com)\n"
+		"Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)\n"
+		"\n"
+		"Usage: %s [options] [file]\n"
+		"Options are:\n"
+#ifdef WITH_MAILRECEIVE
+		"    -m              Parse mail, put received letter to $mail:received\n"
+#endif
+		"    -f config_file  Use this config file (/path/to/auto.p)\n"
+		"    -p [host:]port  Start web server on this port\n"
+		"    -h              Display usage information (this message)\n",
+		PARSER_VERSION,
+		program);
+	exit(EINVAL);
+}
 
-		// must be last in PTRY{}PCATCH
-#ifdef WIN32
-		SetUnhandledExceptionFilter(0);
+static void locate_config(const char *executable_path){
+	if(!config_filespec) {
+		config_filespec=getenv(PARSER_CONFIG_ENV_NAME);
+		if(!config_filespec)
+			config_filespec=getenv(REDIRECT_PREFIX PARSER_CONFIG_ENV_NAME);
+		if(!config_filespec){
+			// next to the executable
+			char beside_executable_path[MAX_STRING];
+			strncpy(beside_executable_path, executable_path, MAX_STRING-1);  beside_executable_path[MAX_STRING-1]=0;
+			if(!(rsplit(beside_executable_path, '/') || rsplit(beside_executable_path, '\\'))) { // strip filename
+				// no path, just filename
+				// @todo full path, not ./!
+				beside_executable_path[0]='.'; beside_executable_path[1]=0;
+			}
+			char config_filespec_buf[MAX_STRING];
+			snprintf(config_filespec_buf, MAX_STRING, "%s/%s", beside_executable_path, AUTO_FILE_NAME);
+			if(entry_exists(config_filespec_buf))
+				config_filespec=pa_strdup(config_filespec_buf);
+		}
+	}
+}
+
+
+int main(int argc, char *argv[]) {
+#ifdef PA_DEBUG_CGI_ENTRY_EXIT
+	log("main: entry");
 #endif
-		// successful finish
-		return 0;
-	} PCATCH(e) { // global problem 
-		// must be first in PCATCH{}
-#ifdef WIN32
-		SetUnhandledExceptionFilter(0);
+
+	umask(2);
+
+	// were we started as CGI?
+	cgi=(getenv("SERVER_SOFTWARE") || getenv("SERVER_NAME") || getenv("GATEWAY_INTERFACE") || getenv("REQUEST_METHOD")) && !getenv("PARSER_VERSION");
+	sapiInfo = cgi ? new SAPI_Info_CGI() : new SAPI_Info();
+
+#ifdef SIGUSR1
+    if(signal(SIGUSR1, SIGUSR1_handler)==SIG_ERR)
+		SAPI::die("Can not set handler for SIGUSR1");
+#endif
+#ifdef SIGPIPE
+    if(signal(SIGPIPE, SIGPIPE_handler)==SIG_ERR)
+		SAPI::die("Can not set handler for SIGPIPE");
 #endif
-		// don't allocate anything on pool here:
-		//   possible pool' exception not catch-ed now
-		//   and there could be out-of-memory exception
 
-		const char *body=e.comment();
-		// log it
-		SAPI::log(pool, "exception in request exception handler: %s", body);
+	char *raw_filespec_to_process = NULL;
+	if(cgi) {
+		raw_filespec_to_process=getenv("PATH_TRANSLATED");
+		argv_all=argv + 1;
+	} else {
+		int optind=1;
+		while(optind < argc){
+			char *carg = argv[optind];
+			if(carg[0] != '-')
+				break;
+
+			for(size_t k = 1; k < strlen(carg); k++){
+				char c = carg[k];
+				switch (c) {
+					case 'h':
+						usage(argv[0]);
+						break;
+					case 'f':
+						if(optind < argc - 1){
+							optind++;
+							config_filespec=argv[optind];
+						}
+						break;
+					case 'p':
+						if(optind < argc - 1){
+							optind++;
+							httpd_host_port=argv[optind];
+						}
+						break;
+#ifdef WITH_MAILRECEIVE
+					case 'm':
+						mail_received=true;
+						break;
+#endif
+					default:
+						fprintf(stderr, "%s: invalid option '%c'\n", argv[0], c);
+						usage(argv[0]);
+						break;
+				}
+			}
+			optind++;
+		}
+		
+		if (optind > argc - 1) {
+			if(!httpd_host_port) {
+				fprintf(stderr, "%s: file not specified\n", argv[0]);
+				usage(argv[0]);
+			}
+		} else {
+			raw_filespec_to_process=argv[optind];
+		}
+
+		if (httpd_host_port && mail_received) {
+				fprintf(stderr, "%s: -p and -m options should not be used together\n", argv[0]);
+				usage(argv[0]);
+		}
+
+		argv_all=argv + optind;
+	}
+
+#ifdef _MSC_VER
+	setmode(fileno(stdin), _O_BINARY);
+	setmode(fileno(stdout), _O_BINARY);
+	setmode(fileno(stderr), _O_BINARY);
+#endif
+
+#if defined(_MSC_VER) && defined(_DEBUG)
+	// Get current flag
+	int tmpFlag = _CrtSetDbgFlag( _CRTDBG_REPORT_FLAG );
 
-		//
-		int content_length=strlen(body);
+	// Turn on leak-checking bit
+	tmpFlag |= _CRTDBG_LEAK_CHECK_DF;
 
-		// prepare header
-		SAPI::add_header_attribute(pool, "content-type", "text/plain");
-		char content_length_cstr[MAX_NUMBER];
-		snprintf(content_length_cstr, MAX_NUMBER, "%u", content_length);
-		SAPI::add_header_attribute(pool, "content-length", content_length_cstr);
+	// Set flag to the new value
+	_CrtSetDbgFlag( tmpFlag );
 
-		// send header
-		SAPI::send_header(pool);
+	_CrtSetReportMode( _CRT_WARN, _CRTDBG_MODE_FILE );
+	_CrtSetReportFile( _CRT_WARN, _CRTDBG_FILE_STDERR );
+#endif
+
+	char filespec_to_process_buf[MAX_STRING];
+	if(raw_filespec_to_process && *raw_filespec_to_process){
+		full_disk_path(raw_filespec_to_process, filespec_to_process_buf, sizeof(filespec_to_process_buf));
+		filespec_to_process=filespec_to_process_buf;
+	}
 
-		// body
-		if(!header_only)
-			SAPI::send_body(pool, body, content_length);
+	locate_config(argv[0]);
 
-		// unsuccessful finish
-		return 1;
+	try { // global try
+		REAL_PARSER_HANDLER();
+	} catch(const Exception& e) { // exception in unhandled exception
+		SAPI::die("%s", e.comment());
 	}
-	PEND_CATCH
+
+#ifdef PA_DEBUG_CGI_ENTRY_EXIT
+	log("main: successful return");
+#endif
+	return sapiInfo->http_response_code < 100 ? sapiInfo->http_response_code : 0;
 }