--- parser3/src/targets/cgi/parser3.C 2001/03/13 17:54:14 1.2 +++ parser3/src/targets/cgi/parser3.C 2020/12/15 20:57:56 1.331 @@ -1,43 +1,695 @@ -/* - 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) 2001-2020 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 1.331 2020/12/15 20:57:56 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" +#include "pa_sapi_info.h" -int main(int argc, char *argv[]) { - Pool pool; - core(pool); +#ifdef _MSC_VER +#include +#include +#include + +extern "C" HANDLE WINAPI GC_CreateThread(LPSECURITY_ATTRIBUTES, DWORD, LPTHREAD_START_ROUTINE, LPVOID, DWORD, LPDWORD); + +#else + +extern "C" int GC_pthread_create(pthread_t *, const pthread_attr_t *, void *(*)(void *), void * /* arg */); + +#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" + +static const char* filespec_to_process = 0; // [file] +static const char* httpd_host_port = 0; // -p option +static const char* config_filespec = 0; // -f option or from env or next to the executable if exists +static bool mail_received = false; // -m option? [asked to parse incoming message to $mail:received] +static char* parser3_filespec = 0; // argv[0] +static char** argv_extra = NULL; + +// for error logging +static THREAD_LOCAL Request_info request_info; // global for correct log() reporting +static const char* filespec_4log = NULL; // null only if system-wide auto.p used + +// SAPI - 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 - ); +static void log(const char* fmt, va_list args) { + bool opened=false; + FILE *f=0; - bool error; - char *result=request.core(error); + 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(error) - printf("ERROR: %s", result); + if(!opened && filespec_4log) { + char beside_config_path[MAX_STRING]; + strncpy(beside_config_path, filespec_4log, 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 + strcpy(beside_config_path, "."); + } + + 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.method) { + fprintf(f, " [uri=%s, method=%s, cl=%lu]\n", request_info.uri ? request_info.uri : "", request_info.method, (unsigned long)request_info.content_length); + } else + fputs(" [no request info]\n", f); + + if(opened) + fclose(f); else - printf("%s", result); + 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 next to the config file 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 message[MAX_STRING]; + vsnprintf(message, MAX_STRING, fmt, args); + + SAPI::send_error(*sapiInfo, message); + exit(1); +// va_end(args); +} + +char* SAPI::Env::get(SAPI_Info& info, const char* name) { + return info.get_env(name); +} + +bool SAPI::Env::set(SAPI_Info& info, const char* name, const char* value) { + return info.set_env(name, value); +} + +const char* const *SAPI::Env::get(SAPI_Info& info) { + return info.get_env(); +} + +size_t SAPI::read_post(SAPI_Info& info, char *buf, size_t max_bytes) { + return info.read_post(buf, max_bytes); +} + +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); +} + +void SAPI::send_header(SAPI_Info& info) { + info.send_header(); +} + +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 + || 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); + } +#ifdef WIN32 + 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 + +// requires pa_thread_request() in entry_exists() under Windows +static const char *locate_config(const char *config_filespec_option, const char *executable_path){ + filespec_4log=config_filespec_option; + if(!filespec_4log) + filespec_4log=getenv(PARSER_CONFIG_ENV_NAME); + if(!filespec_4log) + filespec_4log=getenv(REDIRECT_PREFIX PARSER_CONFIG_ENV_NAME); + if(!filespec_4log){ + // next to the executable + char *beside_executable_path = pa_strdup(executable_path); + bool stripped_filename = rsplit(beside_executable_path, '/') || rsplit(beside_executable_path, '\\'); + filespec_4log = pa_strcat(stripped_filename ? beside_executable_path : "." /* no path, just filename */ , "/" AUTO_FILE_NAME); + if(entry_exists(filespec_4log)) + return filespec_4log; +#ifdef SYSTEM_CONFIG_FILE + if(entry_exists(SYSTEM_CONFIG_FILE)){ + filespec_4log=NULL; + return SYSTEM_CONFIG_FILE; + } +#endif + return NULL; + } + return filespec_4log; +} + +#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 void config_handler(SAPI_Info &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.uri = ""; + request_info.argv = argv_extra; + + // prepare to process request + Request r(info, request_info, String::Language(String::L_HTML|String::L_OPTIMIZE_BIT)); + // only once + config_filespec = locate_config(config_filespec, parser3_filespec); + // process main auto.p only + r.core(config_filespec, false, String::Empty); +} + +static void connection_handler(SAPI_Info_HTTPD &info, HTTPD_Connection &connection) { + try { + memset(&request_info, 0, sizeof(request_info)); + + connection.read_header(); + info.populate_env(); + + 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 = (size_t)connection.content_length(); + request_info.cookie = info.get_env("HTTP_COOKIE"); + request_info.mail_received = false; + request_info.argv = argv_extra; + + // prepare to process request + Request r(info, request_info, String::Language(String::L_HTML|String::L_OPTIMIZE_BIT)); + // process the request + r.core(config_filespec, strcasecmp(request_info.method, "HEAD")==0, String("httpd-main")); + } 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())); + } +} + +#ifdef _MSC_VER +DWORD WINAPI connection_thread(void *arg){ +#else +static void *connection_thread(void *arg){ +#endif + HTTPD_Connection &connection=*(HTTPD_Connection*)arg; + SAPI_Info_HTTPD info(connection); + + try { + connection_handler(info, connection); + } catch(const Exception& e) { // exception in send_error + SAPI::log(*sapiInfo, "%s", e.comment()); + } + + delete(&connection); return 0; } + +static void httpd_mode() { + config_handler(*sapiInfo); + + int sock = HTTPD_Server::bind(httpd_host_port); + +#ifdef SIGCHLD + signal(SIGCHLD, SIG_IGN); +#endif +#ifdef SIGPIPE + signal(SIGPIPE, SIG_IGN); +#endif + + while(1){ +#ifndef _MSC_VER + pid_t pid=1; +#endif + try { + request_info.method=NULL; // wipe previous request for correct logging + HTTPD_Connection connection; + if(!connection.accept(sock, 5)) + continue; + + switch (HTTPD_Server::mode) { + case HTTPD_Server::MULTITHREADED: +#ifdef _MSC_VER + if (!GC_CreateThread(0, 0, connection_thread, new HTTPD_Connection(connection), 0, 0)) + throw Exception("httpd.fork", 0, "thread creation failed"); + connection.sock = -1; + break; +#else + pthread_t thread; + pthread_attr_t attr; + pthread_attr_init(&attr); + pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); + + if(int result=GC_pthread_create(&thread, &attr, connection_thread, new HTTPD_Connection(connection))) + throw Exception("httpd.fork", 0, "thread creation failed (%d)", result); + connection.sock=-1; + break; + case HTTPD_Server::PARALLEL: + pid=fork(); + if(pid<0) + throw Exception("httpd.fork", 0, "fork failed: %s (%d)", strerror(errno), errno); + if(pid>0) + continue; // parent should close connection.sock as well +#endif + case HTTPD_Server::SEQUENTIAL: // and fork child + + SAPI_Info_HTTPD info(connection); + connection_handler(info, connection); + } + // closing connection socket in HTTPD_Connection destructor + } catch(const Exception& e) { // exception in accept or send_error + SAPI::log(*sapiInfo, "%s", e.comment()); + } + +#ifndef _MSC_VER + if(pid==0) // fork child + exit(0); +#endif + } +} + +/** main workhorse */ + +static void real_parser_handler(bool cgi) { + // 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 + request_info.uri = request_info.query_string && *request_info.query_string ? pa_strcat(path_info, "?", request_info.query_string) : 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 = (size_t)pa_atoul(getenv("CONTENT_LENGTH")); + request_info.cookie = getenv("HTTP_COOKIE"); + request_info.mail_received = mail_received; + + request_info.argv = argv_extra; + +#ifdef PA_DEBUG_CGI_ENTRY_EXIT + log("request_info: method=%s, uri=%s, q=%s, dr=%s, pt=%s", request_info.method, request_info.uri, request_info.query_string, request_info.document_root, request_info.path_translated); +#endif + + // prepare to process request + Request r(*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(&r); + // process the request + r.core(locate_config(config_filespec, parser3_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(bool cgi) { + try { + real_parser_handler(cgi); + } catch(const Exception& e) { + return e; + } + + return Exception(); +} + +static void call_real_parser_handler__supress_system_exception(bool cgi) { + Exception parser_exception; + LPEXCEPTION_POINTERS system_exception=0; + + __try { + parser_exception=call_real_parser_handler__do_PEH_return_it(cgi); + } __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) 2001-2020 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" + " -p [host:]port Start web server on this port\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 + + parser3_filespec = argv[0]; + umask(2); + + // were we started as CGI? + bool 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 + signal(SIGUSR1, SIGUSR1_handler); +#endif +#ifdef SIGPIPE + signal(SIGPIPE, SIGPIPE_handler); +#endif + + char *raw_filespec_to_process = NULL; + if(cgi) { + raw_filespec_to_process=getenv("PATH_TRANSLATED"); + argv_extra=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_extra=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 ); + + // 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 + + try { // global try + 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; + } + + REAL_PARSER_HANDLER(cgi); + } catch(const Exception& e) { // exception in unhandled exception + SAPI::die("%s", e.comment()); + } + +#ifdef PA_DEBUG_CGI_ENTRY_EXIT + log("main: successful return"); +#endif + return sapiInfo->http_response_code < 100 ? sapiInfo->http_response_code : 0; +}