--- parser3/src/targets/cgi/parser3.C 2001/03/13 17:54:14 1.2 +++ parser3/src/targets/cgi/parser3.C 2020/10/03 22:58:07 1.293 @@ -1,43 +1,623 @@ -/* - Parser - Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com) - Author: Alexander Petrosyan (http://design.ru/paf) +/** @file + Parser: scripting and CGI main. - $Id: parser3.C,v 1.2 2001/03/13 17:54:14 paf Exp $ + Copyright (c) 2001-2017 Art. Lebedev Studio (http://www.artlebedev.com) + Author: Alexandr Petrosian (http://paf.design.ru) */ -#include "core.h" -#include "pa_request.h" +volatile const char * IDENT_PARSER3_C="$Id: parser3.C,v 1.293 2020/10/03 22:58:07 moko Exp $"; + +#include "pa_config_includes.h" + +#include "pa_sapi.h" +#include "classes.h" #include "pa_common.h" +#include "pa_request.h" +#include "pa_version.h" +#include "pa_vconsole.h" -int main(int argc, char *argv[]) { - Pool pool; - core(pool); +#ifdef _MSC_VER +#include +#include +#include +#endif + +// defines + +// comment remove me after debugging +//#define PA_DEBUG_CGI_ENTRY_EXIT "parser3-debug.log" + +#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" + +/// IIS refuses to read bigger chunks +const size_t READ_POST_CHUNK_SIZE=0x400*0x400; // 1M + +static const char* config_filespec_cstr=0; // -f option +static bool mail_received=false; // -m option? [asked to parse incoming message to $mail:received] + +static int args_skip=1; +static char** argv_all = NULL; + +static bool cgi; ///< we were started as CGI? + +// for signal handlers +Request *request=0; +Request_info *request_info=0; +bool execution_canceled=false; - bool cgi= - getenv("SERVER_SOFTWARE") || - getenv("SERVER_NAME") || - getenv("GATEWAY_INTERFACE") || - getenv("REQUEST_METHOD"); - - // TODO: ifdef WIN32 flip \\ to / - char *document_root="Y:/parser3/src/"; - char *page_filespec="Y:/parser3/src/test.p"; - - // request - Request request(pool, - cgi?String::Untaint_lang::HTML_TYPO:String::Untaint_lang::NO, // :) - document_root, - page_filespec - ); +// SAPI + +class SAPI_Info { +public: + int http_response_code; +} SAPI_info = { 0 }; + +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 : "", + request_info->method ? request_info->method : "", + request_info->content_length); + else + fputs(" [no request info]", f); + + // newline + fputs("\n", f); + + if(opened) + fclose(f); + else + fflush(f); +} - bool error; - char *result=request.core(error); +#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); +} + +void SAPI::die(const char* fmt, ...) { + va_list args; + + // logging first, first vsnprintf + va_start(args,fmt); + ::log(fmt, args); + va_end(args); + + // inform user, second vsnprintf + va_start(args, fmt); + 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(1); +// 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_sizeconsole.was_used()) ) + printf("%s: %s\n", capitalize(dont_store_key), dont_store_value); +} + +void SAPI::send_header(SAPI_Info& ) { + if(cgi) { + 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-1); buf[buf_size-1]=0; + } 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 +} - if(error) - printf("ERROR: %s", result); +static void log_signal(const char* signal_name) { + if(request_info) + SAPI::log(SAPI_info, "%s received while %s.", signal_name, request ? "executing code" : "reading data"); else - printf("%s", result); + 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_skip(Request::SKIP_INTERRUPTED); +} +#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; +} + +#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 + + +class RequestController { +public: + RequestController(Request* r){ + ::request=r; + } + ~RequestController(){ + ::request=0; + } +}; + +static bool locate_config(){ + if(!config_filespec_cstr) { + config_filespec_cstr=getenv(PARSER_CONFIG_ENV_NAME); + if(!config_filespec_cstr) + config_filespec_cstr=getenv(REDIRECT_PREFIX PARSER_CONFIG_ENV_NAME); + if(!config_filespec_cstr){ + // beside by binary + char beside_binary_path[MAX_STRING]; + strncpy(beside_binary_path, argv_all[0], 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; + } + char config_filespec_buf[MAX_STRING]; + snprintf(config_filespec_buf, MAX_STRING, "%s/%s", beside_binary_path, AUTO_FILE_NAME); + config_filespec_cstr=pa_strdup(config_filespec_buf); + return entry_exists(config_filespec_cstr); + } + } + return true; +} + +/** +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 libraries + pa_globals_init(); + + if(!filespec_to_process || !*filespec_to_process) + SAPI::die("Parser/%s", PARSER_VERSION); + + // Request info + Request_info request_info; memset(&request_info, 0, sizeof(request_info)); + char document_root_buf[MAX_STRING]; + + 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 + request_info.uri = path_info; + } + } else{ + full_file_spec("", document_root_buf, sizeof(document_root_buf)); + request_info.document_root = document_root_buf; + 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); + bool fail_on_config_read_problem=locate_config(); + // 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 libraries + pa_globals_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, ""); + else + throw Exception("system", 0, ""); + } + + if(parser_exception) + throw Exception(parser_exception); +} + +#define REAL_PARSER_HANDLER call_real_parser_handler__supress_system_exception +#else +#define REAL_PARSER_HANDLER real_parser_handler +#endif + +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 (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 + +#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 + + argv_all=argv; + 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 + REAL_PARSER_HANDLER(filespec_to_process, request_method, header_only); + } catch(const Exception& e) { // exception in unhandled exception + SAPI::die("Unhandled exception %s", e.comment()); + } - return 0; +#ifdef PA_DEBUG_CGI_ENTRY_EXIT + log("main: successful return"); +#endif + return SAPI_info.http_response_code < 100 ? SAPI_info.http_response_code : 0; }