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/** @file
Parser: scripting and CGI main.
Copyright (c) 2001-2015 Art. Lebedev Studio (http://www.artlebedev.com)
Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
*/
volatile const char * IDENT_PARSER3_C="$Id: parser3.C,v 1.269 2015/10/26 01:22:00 moko Exp $";
#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"
#ifdef _MSC_VER
#include <crtdbg.h>
#include <windows.h>
#include <direct.h>
#endif
// defines
// comment remove me after debugging
//#define PA_DEBUG_CGI_ENTRY_EXIT "c:\\parser\\debug-parser3.log"
#if _MSC_VER && !defined(_DEBUG)
# define PA_SUPPRESS_SYSTEM_EXCEPTION
#endif
//#define DEBUG_MAILRECEIVE "mailreceive.eml"
// consts
#define REDIRECT_PREFIX "REDIRECT_"
#define PARSER_CONFIG_ENV_NAME "CGI_PARSER_CONFIG"
#define PARSER_LOG_ENV_NAME "CGI_PARSER_LOG"
#define PARSER_CONFIG_DIR "/etc/parser3"
/// IIS refuses to read bigger chunks
const size_t READ_POST_CHUNK_SIZE=0x400*0x400; // 1M
static const char* argv0;
static const char* config_filespec_cstr=0;
static bool fail_on_config_read_problem=true;
static int args_skip=1;
static char** argv_all = NULL;
static bool cgi; ///< we were started as CGI?
static bool mail_received=false; ///< we were started with -m option? [asked to parse incoming message to $mail:received]
// for signal handlers
Request *request=0;
Request_info *request_info=0;
bool execution_canceled=false;
// SAPI
class SAPI_Info{} SAPI_info;
static void log(const char* fmt, va_list args) {
bool opened=false;
FILE *f=0;
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_cstr) {
char beside_config_path[MAX_STRING];
strncpy(beside_config_path, config_filespec_cstr, 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];
snprintf(file_spec, MAX_STRING,
"%s/parser3.log", beside_config_path);
f=fopen(file_spec, "at");
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);
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
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)
fprintf(f, " [uri=%s, method=%s, cl=%lu]",
request_info->uri? request_info->uri: "<unknown>",
request_info->method? request_info->method: "<unknown>",
request_info->content_length);
else
fputs(" [no request info]", f);
// newline
fputs("\n", f);
if(opened)
fclose(f);
else
fflush(f);
}
#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 beside my binary 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);
}
static void die_or_abort(const char* fmt, va_list args, bool write_core) {
// inform user
char body[MAX_STRING];
int content_length=vsnprintf(body, MAX_STRING, fmt, args);
// prepare header
// let's be honest, that's bad we couldn't produce valid output
// capitalized headers passed for preventing malloc during capitalization
SAPI::add_header_attribute(SAPI_info, HTTP_STATUS_CAPITALIZED, "500");
SAPI::add_header_attribute(SAPI_info, HTTP_CONTENT_TYPE_CAPITALIZED, "text/plain");
// don't use 'format' function because it calls malloc
char content_length_cstr[MAX_NUMBER];
snprintf(content_length_cstr, sizeof(content_length_cstr), "%u", content_length);
SAPI::add_header_attribute(SAPI_info, HTTP_CONTENT_LENGTH_CAPITALIZED, content_length_cstr);
// send header
SAPI::send_header(SAPI_info);
// body
SAPI::send_body(SAPI_info, body, content_length);
// exit & try to produce core dump[unix] or invoke debugger[Win32 Debug version]
if(write_core) {
#ifdef WIN32
// IIS with abort failes to show STDOUT, it just barks "abnormal program termination"
exit(1);
#else
abort();
#endif
}
else
exit(1);
}
void SAPI::die(const char* fmt, ...) {
va_list args;
// logging first, can't log inside die_or_abort due to vsnprintf (bug #106)
va_start(args,fmt);
::log(fmt, args);
va_end(args);
va_start(args, fmt);
die_or_abort(fmt, args, false /*write core?*/);
// va_end(args);
}
void SAPI::abort(const char* fmt, ...) {
va_list args;
// logging first, can't log inside die_or_abort due to vsnprintf (bug #106)
va_start(args,fmt);
::log(fmt, args);
va_end(args);
va_start(args, fmt);
die_or_abort(fmt, args, true /*write core?*/);
// va_end(args);
}
char* SAPI::Env::get(SAPI_Info& , const char* name) {
if(char *local=getenv(name))
return pa_strdup(local);
else
return 0;
}
const char* const *SAPI::Env::get(SAPI_Info&) {
#ifdef _MSC_VER
extern char **_environ;
return _environ;
#else
extern char **environ;
return environ;
#endif
}
size_t SAPI::read_post(SAPI_Info& , char *buf, size_t max_bytes) {
size_t read_size=0;
do {
ssize_t 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);
return read_size;
}
void SAPI::add_header_attribute(SAPI_Info& , const char* dont_store_key, const char* dont_store_value) {
if( cgi && (!request || !request->console.was_used()) )
printf("%s: %s\n", capitalize(dont_store_key), dont_store_value);
}
/// @todo intelligent cache-control
void SAPI::send_header(SAPI_Info& ) {
if(cgi) {
// puts("expires: Fri, 23 Mar 2001 09:32:23 GMT");
// header | body delimiter
puts("");
}
}
size_t SAPI::send_body(SAPI_Info& , const void *buf, size_t size) {
return stdout_write(buf, size);
}
//
static void full_file_spec(const char* file_name, char *buf, size_t buf_size) {
if(file_name)
if(file_name[0]=='/'
#ifdef WIN32
|| file_name[0] && file_name[1]==':'
#endif
)
strncpy(buf, file_name, buf_size);
else {
char cwd[MAX_STRING];
snprintf(buf, buf_size, "%s/%s", getcwd(cwd, MAX_STRING) ? cwd : "", file_name);
}
else
buf[0]=0;
#ifdef WIN32
back_slashes_to_slashes(buf);
#endif
}
static void log_signal(const char* signal_name) {
if(request_info)
SAPI::log(SAPI_info, "%s received while %s. uri=%s, method=%s, cl=%u",
signal_name,
request?"executing code":"reading data",
request_info->uri,
request_info->method,
request_info->content_length);
else
SAPI::log(SAPI_info, "%s received before or after processing request",
signal_name);
}
#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);
execution_canceled=true;
if(request)
request->set_interrupted(true);
}
#endif
#ifdef WIN32
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;
}
#endif
class RequestController {
public:
RequestController(Request* r){
::request=r;
}
~RequestController(){
::request=0;
}
};
/**
main workhorse
@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.
*/
static void real_parser_handler(const char* filespec_to_process,
const char* request_method, bool header_only)
{
// init socks
pa_socks_init();
// init global variables
pa_globals_init();
if(!filespec_to_process || !*filespec_to_process)
SAPI::die("Parser/%s"
#ifdef PA_DEBUG_CGI_ENTRY_EXIT
" with entry/exit tracing"
#endif
, PARSER_VERSION);
// Request info
Request_info request_info; memset(&request_info, 0, sizeof(request_info));
char document_root_buf[MAX_STRING];
if(cgi) {
if(const char* env_document_root=getenv("DOCUMENT_ROOT"))
request_info.document_root=env_document_root;
else if(const char* path_info=getenv("PATH_INFO")) {
// IIS
size_t len=min(sizeof(document_root_buf)-1, strlen(filespec_to_process)-strlen(path_info));
memcpy(document_root_buf, filespec_to_process, len); document_root_buf[len]=0;
request_info.document_root=document_root_buf;
} else
throw Exception(PARSER_RUNTIME,
0,
"CGI: no PATH_INFO defined(in reinventing DOCUMENT_ROOT)");
} else {
full_file_spec("", document_root_buf, sizeof(document_root_buf));
request_info.document_root=document_root_buf;
}
request_info.path_translated=filespec_to_process;
request_info.method=request_method ? request_method : "GET";
const char* query_string=
#ifdef WIN32
maybe_reconstruct_IIS_status_in_qs
#endif
(getenv("QUERY_STRING"));
request_info.query_string=query_string;
if(cgi) {
// few absolute obligatory
const char* path_info=getenv("PATH_INFO");
if(!path_info)
SAPI::die("CGI: illegal call (missing PATH_INFO)");
const char* script_name=getenv("SCRIPT_NAME");
if(!script_name)
SAPI::die("CGI: illegal call (missing SCRIPT_NAME)");
const char* env_request_uri=getenv("REQUEST_URI");
if(env_request_uri)
request_info.uri=env_request_uri;
else
if(query_string) {
char* reconstructed_uri=new(PointerFreeGC) char[
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;
if(env_request_uri) { // apache & others stuck to standards
/*
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(env_request_uri);
if(strncmp(env_request_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 { // seen on IIS5
/*
http://nestle/env.html?123 =OK
$request:uri=/env.html?123
REQUEST_URI=''
SCRIPT_NAME='/env.html'
PATH_INFO='/env.html'
http://nestle/cgi-bin/parser3.exe/env.html =ERROR
$request:uri=/env.html
REQUEST_URI=''
SCRIPT_NAME='/cgi-bin/parser3.exe'
PATH_INFO='/env.html'
*/
if(strcmp(script_name, path_info)!=0)
SAPI::die("CGI: illegal call (2)");
}
} else
request_info.uri="";
request_info.content_type=getenv("CONTENT_TYPE");
const char* content_length=getenv("CONTENT_LENGTH");
request_info.content_length=(content_length?atoi(content_length):0);
request_info.cookie=getenv("HTTP_COOKIE");
request_info.mail_received=mail_received;
request_info.argv=argv_all;
request_info.args_skip=args_skip;
// get request_info ptr for signal handlers
::request_info=&request_info;
if(execution_canceled)
SAPI::die("Execution canceled");
#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(SAPI_info, request_info,
cgi ? String::Language(String::L_HTML|String::L_OPTIMIZE_BIT) : String::L_AS_IS);
{
// get ::request ptr for signal handlers
RequestController rc(&request);
char config_filespec_buf[MAX_STRING];
if(!config_filespec_cstr) {
const char* config_by_env=getenv(PARSER_CONFIG_ENV_NAME);
if(!config_by_env)
config_by_env=getenv(REDIRECT_PREFIX PARSER_CONFIG_ENV_NAME);
if(config_by_env)
config_filespec_cstr=config_by_env;
else {
// beside by binary
char beside_binary_path[MAX_STRING];
strncpy(beside_binary_path, argv0, MAX_STRING-1); beside_binary_path[MAX_STRING-1]=0; // filespec of my binary
if(!(
rsplit(beside_binary_path, '/') ||
rsplit(beside_binary_path, '\\'))) { // strip filename
// no path, just filename
// @todo full path, not ./!
beside_binary_path[0]='.'; beside_binary_path[1]=0;
}
snprintf(config_filespec_buf, MAX_STRING,
"%s/%s",
beside_binary_path, AUTO_FILE_NAME);
config_filespec_cstr=config_filespec_buf;
if (!entry_exists(config_filespec_cstr)) // default system-wide...
config_filespec_cstr=PARSER_CONFIG_DIR "/" AUTO_FILE_NAME;
fail_on_config_read_problem=entry_exists(config_filespec_cstr);
}
}
// process the request
request.core(
config_filespec_cstr, fail_on_config_read_problem,
header_only);
// ::request cleared in RequestController desctructor to prevent signal handlers from accessing invalid memory
}
// finalize global variables
pa_globals_done();
//
pa_socks_done();
}
#ifdef PA_SUPPRESS_SYSTEM_EXCEPTION
static const Exception
call_real_parser_handler__do_PEH_return_it(
const char* filespec_to_process,
const char* request_method, bool header_only)
{
try {
real_parser_handler(
filespec_to_process,
request_method, header_only);
} catch(const Exception& e) {
return e;
}
return Exception();
}
static void call_real_parser_handler__supress_system_exception(
const char* filespec_to_process,
const char* request_method, bool header_only)
{
Exception parser_exception;
LPEXCEPTION_POINTERS system_exception=0;
__try {
parser_exception=call_real_parser_handler__do_PEH_return_it(
filespec_to_process,
request_method, header_only);
} __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
throw Exception("system",
0,
"<no exception record>");
else
throw Exception("system",
0,
"<no exception information>");
}
if(parser_exception)
throw Exception(parser_exception);
}
#endif
static void usage(const char* program) {
printf(
"Parser/%s\n"
"Copyright (c) 2001-2015 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"
" -h Display usage information (this message)\n"
, PARSER_VERSION,
program);
exit(EINVAL);
}
int main(int argc, char *argv[]) {
#ifdef PA_DEBUG_CGI_ENTRY_EXIT
log("main: entry");
#endif
#ifndef PA_DEBUG_DISABLE_GC
GC_java_finalization=0;
// Dont collect unless explicitly requested
// this is quicker (~30% ), but less memory-efficient(~8%)
// so deciding for speed
GC_dont_gc=1;
#endif
#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
#ifdef DEBUG_MAILRECEIVE
if(FILE *fake_in=fopen(DEBUG_MAILRECEIVE, "rt")) {
dup2(fake_in->_file, 0/*STDIN_FILENO*/);
}
#endif
argv_all=argv;
argv0=argv[0];
umask(2);
// were we started as CGI?
cgi=
(
getenv("SERVER_SOFTWARE") ||
getenv("SERVER_NAME") ||
getenv("GATEWAY_INTERFACE") ||
getenv("REQUEST_METHOD")
)
&& !getenv("PARSER_VERSION");
char *raw_filespec_to_process;
if(cgi) {
raw_filespec_to_process=getenv("PATH_TRANSLATED");
if(raw_filespec_to_process && !*raw_filespec_to_process)
raw_filespec_to_process=0;
} 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_cstr=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) {
fprintf(stderr, "%s: file not specified\n", argv[0]);
usage(argv[0]);
}
raw_filespec_to_process=argv[optind];
args_skip=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 );
// Turn on leak-checking bit
tmpFlag |= _CRTDBG_LEAK_CHECK_DF;
// Set flag to the new value
_CrtSetDbgFlag( tmpFlag );
_CrtSetReportMode( _CRT_WARN, _CRTDBG_MODE_FILE );
_CrtSetReportFile( _CRT_WARN, _CRTDBG_FILE_STDERR );
#endif
char filespec_to_process[MAX_STRING];
full_file_spec(raw_filespec_to_process, filespec_to_process, sizeof(filespec_to_process));
const char* request_method=getenv("REQUEST_METHOD");
bool header_only=request_method && strcasecmp(request_method, "HEAD")==0;
try { // global try
#ifdef PA_SUPPRESS_SYSTEM_EXCEPTION
call_real_parser_handler__supress_system_exception(
#else
real_parser_handler(
#endif
filespec_to_process,
request_method, header_only);
} catch(const Exception& e) { // global problem
// don't allocate anything on pool here:
// possible pool' exception not catch-ed now
// and there could be out-of-memory exception
char buf[MAX_STRING];
snprintf(buf, MAX_STRING, "Unhandled exception %s",
e.comment());
// log it
SAPI::log(SAPI_info, "%s", buf);
//
int content_length=strlen(buf);
// prepare header
// capitalized headers are used for preventing malloc during capitalization
SAPI::add_header_attribute(SAPI_info, HTTP_CONTENT_TYPE_CAPITALIZED, "text/plain");
// don't use 'format' function because it calls malloc
char content_length_cstr[MAX_NUMBER];
snprintf(content_length_cstr, MAX_NUMBER, "%u", content_length);
SAPI::add_header_attribute(SAPI_info, HTTP_CONTENT_LENGTH_CAPITALIZED, content_length_cstr);
// send header
SAPI::send_header(SAPI_info);
// send body
if(!header_only)
SAPI::send_body(SAPI_info, buf, content_length);
// unsuccessful finish
}
#ifdef PA_DEBUG_CGI_ENTRY_EXIT
log("main: successful return");
#endif
return 0;
}
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