Annotation of parser3/src/main/pa_exec.C, revision 1.54
1.1 paf 1: /** @file
2: Parser: program executing for different OS-es.
3:
1.51 paf 4: Copyright(c) 2000,2001-2003 ArtLebedev Group(http://www.artlebedev.com)
1.25 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 paf 6:
1.18 paf 7: @todo setrlimit
1.1 paf 8: */
1.38 paf 9:
1.54 ! paf 10: static const char * const IDENT_EXEC_C="$Date: 2003/11/20 15:35:31 $";
1.1 paf 11:
12: #include "pa_config_includes.h"
13:
1.19 paf 14: #include "pa_exec.h"
15: #include "pa_exception.h"
16: #include "pa_common.h"
17:
1.1 paf 18: #ifdef WIN32
19: # include <windows.h>
20: #else
21: # include <signal.h>
22: # include <sys/types.h>
23: # include <sys/wait.h>
24: #endif
25:
26: #ifdef WIN32
27:
28: /// this func from http://www.ccas.ru/~posp/popov/spawn.htm
1.36 paf 29: static DWORD CreateHiddenConsoleProcess(LPCTSTR szCmdLine,
1.51 paf 30: char *szEnv,
1.1 paf 31: PROCESS_INFORMATION* ppi,
32: LPHANDLE phInWrite,
33: LPHANDLE phOutRead,
1.9 parser 34: LPHANDLE phErrRead)
1.1 paf 35: {
1.51 paf 36: DWORD result=0;
1.36 paf 37: BOOL fCreated;
1.51 paf 38: STARTUPINFO si;
39: SECURITY_ATTRIBUTES sa={0};
40: HANDLE hInRead;
41: HANDLE hOutWrite;
42: HANDLE hErrWrite;
43:
44: // Create pipes
45: // initialize security attributes for handle inheritance (for WinNT)
46: sa.nLength=sizeof(sa);
47: sa.bInheritHandle=TRUE;
48: sa.lpSecurityDescriptor=NULL;
49:
50: // create STDIN pipe
51: if(!CreatePipe(&hInRead, phInWrite, &sa, 0))
52: goto error;
53:
54: // create STDOUT pipe
55: if(!CreatePipe(phOutRead, &hOutWrite, &sa, 0))
56: goto error;
57:
58: // create STDERR pipe
59: if(!CreatePipe(phErrRead, &hErrWrite, &sa, 0))
60: goto error;
61:
62: // process startup information
63: memset(&si, 0, sizeof(si));
64: si.cb=sizeof(si);
65: si.dwFlags=STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
66: // child process' console must be hidden for Win95 compatibility
67: si.wShowWindow=SW_HIDE;
68: // assign "other" sides of pipes
69: si.hStdInput=hInRead;
70: si.hStdOutput=hOutWrite;
71: si.hStdError=hErrWrite;
72:
1.31 paf 73: // calculating script's directory
74: char dir[MAX_STRING];
75: strncpy(dir, szCmdLine, MAX_STRING-1); dir[MAX_STRING-1]=0;
1.33 paf 76: lsplit(dir,' '); // trim arguments
1.31 paf 77: rsplit(dir,'/'); rsplit(dir,'\\'); // trim filename
78: chdir(dir);
1.51 paf 79:
80: // Create a child process (suspended)
81: fCreated=CreateProcess(NULL,
82: (LPTSTR)szCmdLine,
83: NULL,
84: NULL,
85: TRUE,
86: CREATE_NO_WINDOW,
87: szEnv,
88: dir,
89: &si,
90: ppi);
1.36 paf 91: if(!fCreated)
92: result=GetLastError();
1.51 paf 93:
94: CloseHandle(hInRead);
95: CloseHandle(hOutWrite);
96: CloseHandle(hErrWrite);
97:
98: if(!fCreated)
99: goto error;
100:
101: return result;
102:
1.1 paf 103: error:
1.36 paf 104: if(!result/*yet*/)
105: result=GetLastError(); // get it
1.51 paf 106:
107: CloseHandle(*phInWrite);
108: CloseHandle(*phOutRead);
109: CloseHandle(*phErrRead);
110:
111: return result;
112: }
1.36 paf 113:
1.51 paf 114: static void read_pipe(String& result, HANDLE hOutRead, String::Language lang){
115: while(true) {
116: char *buf=new(PointerFreeGC) char[MAX_STRING];
117: unsigned long size;
118: if(!ReadFile(hOutRead, buf, MAX_STRING-1, &size, NULL) || !size)
119: break;
120: buf[size]=0;
121: result.append_know_length(buf, size, lang);
122: }
1.1 paf 123: }
124:
1.51 paf 125: static const char* buildCommand(const char* file_spec_cstr, const ArrayString& argv) {
126: const char* result=file_spec_cstr;
1.4 paf 127: if(FILE *f=fopen(file_spec_cstr, "r")) {
1.51 paf 128: try {
1.1 paf 129: char buf[MAX_STRING];
130: size_t size=fread(buf, 1, MAX_STRING-1, f);
131: if(size>2) {
132: buf[size]=0;
133: if(strncmp(buf, "#!", 2)==0) {
1.51 paf 134: const char* begin=buf+2;
1.4 paf 135: if(*begin==' ') // alx: were an old magic for some linux-es
136: begin++;
137: if(char *end=strchr(begin, '\n')) {
1.51 paf 138: String string(pa_strdup(begin, end-begin));
1.1 paf 139: string << " " << file_spec_cstr;
1.8 parser 140: result=string.cstr();
1.1 paf 141: }
142: }
143: }
1.51 paf 144: } catch(...) {
145: fclose(f);
146: rethrow;
147: }
1.1 paf 148: fclose(f);
149: }
1.51 paf 150: { // appending argv
151: String string(result);
152: for(size_t i=0; i<argv.count(); i++) {
153: string << " ";
154: string << *argv[i];
1.8 parser 155: }
156:
1.51 paf 157: result=string.cstr();
1.8 parser 158: }
159:
160: return result;
1.1 paf 161: }
162:
1.51 paf 163: #else
1.1 paf 164:
1.51 paf 165: static pid_t execve_piped(const char* file_spec_cstr,
1.27 paf 166: char * const argv[], char * const env[],
167: int *pipe_in, int *pipe_out, int *pipe_err) {
1.46 paf 168: pid_t pid;
1.1 paf 169: int in_fds[2];
170: int out_fds[2];
171: int err_fds[2];
172: int save_errno;
173:
174: if(pipe_in && pipe(in_fds)<0) {
175: save_errno=errno;
176: errno=save_errno;
177: return 0;
178: }
179:
180: if(pipe_out && pipe(out_fds)<0) {
181: save_errno=errno;
182: if(pipe_in) {
183: close(in_fds[0]); close(in_fds[1]);
184: }
185: errno=save_errno;
186: return 0;
187: }
188:
189: if(pipe_err && pipe(err_fds)<0) {
190: save_errno=errno;
191: if(pipe_in) {
192: close(in_fds[0]); close(in_fds[1]);
193: }
194: if(pipe_out) {
195: close(out_fds[0]); close(out_fds[1]);
196: }
197: errno=save_errno;
198: return 0;
199: }
200:
201: if((pid=fork())<0) {
202: save_errno=errno;
203: if(pipe_in) {
204: close(in_fds[0]); close(in_fds[1]);
205: }
206: if(pipe_out) {
207: close(out_fds[0]); close(out_fds[1]);
208: }
209: if(pipe_err) {
210: close(err_fds[0]); close(err_fds[1]);
211: }
212: errno=save_errno;
1.46 paf 213: return -1;
1.1 paf 214: }
215:
216: if(!pid) {
217: /* Child process */
218:
219: if(pipe_out) {
220: close(out_fds[0]);
221: dup2(out_fds[1], STDOUT_FILENO);
222: close(out_fds[1]);
223: }
224:
225: if(pipe_in) {
226: close(in_fds[1]);
227: dup2(in_fds[0], STDIN_FILENO);
228: close(in_fds[0]);
229: }
230:
231: if(pipe_err) {
232: close(err_fds[0]);
233: dup2(err_fds[1], STDERR_FILENO);
234: close(err_fds[1]);
235: }
236:
1.42 paf 237: /* grabbed this from Apache source: */
238: /* HP-UX SIGCHLD fix goes here, if someone will remind me what it is... */
1.1 paf 239: signal(SIGCHLD, SIG_DFL); /* Was that it? */
240:
1.31 paf 241: // chdir to script's directory
242: char dir[MAX_STRING];
243: strncpy(dir, file_spec_cstr, MAX_STRING-1); dir[MAX_STRING-1]=0;
244: rsplit(dir,'/'); // trim filename
245: chdir(dir);
246:
247: // execute
248: execve(file_spec_cstr, argv, env);
1.1 paf 249: exit(-errno);
250: }
251:
252: /* Parent process */
253:
254: if(pipe_out) {
255: close(out_fds[1]);
256: *pipe_out=out_fds[0];
257: }
258:
259: if(pipe_in) {
260: close(in_fds[0]);
261: *pipe_in=in_fds[1];
262: }
263:
264: if(pipe_err) {
265: close(err_fds[1]);
266: *pipe_err=err_fds[0];
267: }
268:
269: return pid;
270: }
271:
272: static int get_exit_status(int pid) {
273: int status;
274: if(!waitpid(pid, &status, 0))
275: return -1;
276: return WIFEXITED(status) ?
277: WEXITSTATUS(status) : -2;
278: }
279:
1.51 paf 280: static void read_pipe(String& result, int file, String::Language lang){
1.1 paf 281: while(true) {
1.51 paf 282: char *buf=new(PointerFreeGC) char[MAX_STRING];
283: ssize_t length=read(file, buf, MAX_STRING-1);
284: if(length<=0)
1.49 paf 285: break;
1.51 paf 286: buf[length]=0;
287: result.append_know_length(buf, length, lang);
288: }
1.1 paf 289: }
290:
1.51 paf 291: #endif
1.1 paf 292:
1.51 paf 293: #ifndef DOXYGEN
294: struct Append_env_pair_info {
1.1 paf 295: #ifdef WIN32
1.51 paf 296: String& string;
297: Append_env_pair_info(String& astring): string(astring) {}
298: #else
299: char **env_ref;
300: #endif
301: };
302: #endif
303: ///@test maybe here and at argv construction --- cstr(String::L_UNSPECIFIED
304: static void append_env_pair(HashStringString::key_type key, HashStringString::value_type value,
305: Append_env_pair_info *info) {
306: #ifdef WIN32
307: info->string << key << "=" << value;
308: info->string.append_know_length("\1", 1, String::L_AS_IS); // placeholder for of zero byte
1.1 paf 309: #else
1.52 paf 310: String::Body body;
1.51 paf 311: body << key << "=" << value;
1.1 paf 312:
1.51 paf 313: *(info->env_ref++)=body.cstrm();
1.1 paf 314: #endif
315: }
1.31 paf 316:
1.51 paf 317: /// @todonow unix part to smart_ptr
318: PA_exec_result pa_exec(
1.53 paf 319: bool
320: #ifdef NO_PA_EXEC
321: forced_allow
322: #endif
323: ,
1.32 paf 324: const String& file_spec,
1.51 paf 325: const HashStringString* env,
326: const ArrayString& argv,
327: String& in) {
328: PA_exec_result result;
1.1 paf 329:
1.28 paf 330: #ifdef NO_PA_EXECS
1.32 paf 331: if(!forced_allow)
1.34 paf 332: throw Exception("parser.runtime",
1.32 paf 333: &file_spec,
334: "parser execs are disabled [recompile parser without --disable-execs configure option]");
335: #endif
1.28 paf 336:
1.1 paf 337: #ifdef WIN32
338:
339: PROCESS_INFORMATION pi;
340: HANDLE hInWrite, hOutRead, hErrRead;
1.51 paf 341: const char* cmd=buildCommand(file_spec.cstr(String::L_FILE_SPEC), argv);
1.53 paf 342: char* env_cstr=0;
1.1 paf 343: if(env) {
1.51 paf 344: String string;
345: Append_env_pair_info info(string);
346: env->for_each(append_env_pair, &info);
347: env_cstr=info.string.cstrm(String::L_UNSPECIFIED);
348: for(char* replacer=env_cstr; *replacer; replacer++)
349: if(*replacer=='\1')
350: *replacer=0;
1.1 paf 351: }
1.36 paf 352: if(DWORD error=CreateHiddenConsoleProcess(cmd, env_cstr, &pi, &hInWrite, &hOutRead, &hErrRead)) {
353: char szErrorDesc[MAX_STRING];
1.51 paf 354: const char* param="the file you tried to run";
1.36 paf 355: size_t error_size=FormatMessage(
356: FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_ARGUMENT_ARRAY , NULL, error,
357: MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL),
1.51 paf 358: szErrorDesc, sizeof(szErrorDesc), (va_list *)¶m);
1.36 paf 359: if(error_size>3) // ".\r\n"
360: szErrorDesc[error_size-3]=0;
361:
362: throw Exception(0,
363: &file_spec,
364: "exec failed - %s (%ld). Consider adding shbang line (#!x:\\interpreter\\command line)",
365: error_size?szErrorDesc:"<unknown>", (long)error);
366: } else {
1.51 paf 367: const char* in_cstr=in.cstr();
1.5 paf 368: DWORD written_size;
1.51 paf 369: WriteFile(hInWrite, in_cstr, in.length(), &written_size, NULL);
1.5 paf 370: // EOF for stupid text reads
371: // normally they should read CONTENT_LENGTH bytes,
372: // without this char
373: WriteFile(hInWrite, "\x1A", 1, &written_size, NULL);
1.9 parser 374: CloseHandle(hInWrite);
1.51 paf 375: read_pipe(result.out, hOutRead, String::L_AS_IS);
1.9 parser 376: CloseHandle(hOutRead);
1.51 paf 377: read_pipe(result.err, hErrRead, String::L_TAINTED);
1.9 parser 378: CloseHandle(hErrRead);
1.1 paf 379: /*
380: from http://www.apache.org/websrc/cvsweb.cgi/apache-1.3/src/main/util_script.c?rev=1.151&content-type=text/vnd.viewcvs-markup
381:
382: * We must close the handles to the new process and its main thread
383: * to prevent handle and memory leaks.
384: */
385: CloseHandle(pi.hProcess);
386: CloseHandle(pi.hThread);
387: }
388:
389: #else
1.53 paf 390:
391: // execve needs non const
392: char* file_spec_cstr=file_spec.cstrm(String::L_FILE_SPEC);
1.1 paf 393:
394: int pipe_write, pipe_read, pipe_err;
1.31 paf 395:
1.47 paf 396: #ifdef PA_SAFE_MODE
1.32 paf 397: if(!forced_allow) {
398: struct stat finfo;
399: if(stat(file_spec_cstr, &finfo)!=0)
1.34 paf 400: throw Exception("file.missing",
1.51 paf 401: &file_spec,
402: "stat failed: %s (%d), actual filename '%s'",
403: strerror(errno), errno, file_spec_cstr);
1.31 paf 404:
1.50 paf 405: check_safe_mode(finfo, file_spec, file_spec_cstr);
1.32 paf 406: }
1.31 paf 407: #endif
408:
1.51 paf 409: char* argv_cstrs[1+10+1]={file_spec_cstr, 0};
410: const int argv_size=argv.count();
411: const int argv_max=sizeof(argv_cstrs)/sizeof(argv_cstrs[0])-1-1;
412: if(argv_size>argv_max)
413: throw Exception("parser.runtime",
414: &file_spec,
415: "too many arguments (%d > max %d)", argv_size, argv_max);
416: for(int i=0; i<argv_size; i++)
417: argv_cstrs[1+i]=argv[i]->cstrm();
418: argv_cstrs[1+argv_size]=0;
419:
420: char **env_cstrs;
1.1 paf 421: if(env) {
1.51 paf 422: env_cstrs=new(PointerFreeGC) char *[env->count()+1/*0*/];
423: Append_env_pair_info info={env_cstrs};
424: env->for_each(append_env_pair, &info);
425: *info.env_ref=0;
426: } else
427: env_cstrs=0;
1.31 paf 428:
1.46 paf 429: pid_t pid=execve_piped(
1.1 paf 430: file_spec_cstr,
1.27 paf 431: argv_cstrs, env_cstrs,
1.22 paf 432: &pipe_write, &pipe_read, &pipe_err);
1.46 paf 433: if(pid>0) {
1.21 paf 434: // in child
1.51 paf 435: if(in.length()) {// there is some in data
436: const char* in_cstr=in.cstr();
437: write(pipe_write, in_cstr, in.length());
438: }
1.1 paf 439: close(pipe_write);
1.51 paf 440: read_pipe(result.out, pipe_read, String::L_AS_IS);
1.5 paf 441: close(pipe_read);
1.51 paf 442: read_pipe(result.err, pipe_err, String::L_TAINTED);
1.1 paf 443: close(pipe_err);
444:
1.51 paf 445: result.status=get_exit_status(pid); // negative may mean "-errno[execl()]"
1.1 paf 446: } else
1.34 paf 447: throw Exception(0,
1.2 paf 448: &file_spec,
1.46 paf 449: "%s error: %s (%d)", pid<0?"fork":"pipe", strerror(errno), errno);
1.1 paf 450: #endif
451:
1.51 paf 452: return result;
1.1 paf 453: }
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