Annotation of parser3/src/main/pa_exec.C, revision 1.48.2.11
1.1 paf 1: /** @file
2: Parser: program executing for different OS-es.
3:
1.48.2.5 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:
1.48.2.11! paf 10: static const char* IDENT_EXEC_C="$Date: 2003/02/04 12:08:57 $";
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,
1.1 paf 30: char *szEnv,
31: PROCESS_INFORMATION* ppi,
32: LPHANDLE phInWrite,
33: LPHANDLE phOutRead,
1.9 parser 34: LPHANDLE phErrRead)
1.1 paf 35: {
1.36 paf 36: DWORD result=0;
37: BOOL fCreated;
1.1 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)
1.9 parser 46: sa.nLength=sizeof(sa);
47: sa.bInheritHandle=TRUE;
48: sa.lpSecurityDescriptor=NULL;
1.1 paf 49:
50: // create STDIN pipe
1.9 parser 51: if(!CreatePipe(&hInRead, phInWrite, &sa, 0))
1.1 paf 52: goto error;
53:
54: // create STDOUT pipe
1.9 parser 55: if(!CreatePipe(phOutRead, &hOutWrite, &sa, 0))
1.1 paf 56: goto error;
57:
58: // create STDERR pipe
1.9 parser 59: if(!CreatePipe(phErrRead, &hErrWrite, &sa, 0))
1.1 paf 60: goto error;
61:
62: // process startup information
1.9 parser 63: memset(&si, 0, sizeof(si));
64: si.cb=sizeof(si);
65: si.dwFlags=STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
1.1 paf 66: // child process' console must be hidden for Win95 compatibility
1.9 parser 67: si.wShowWindow=SW_HIDE;
1.1 paf 68: // assign "other" sides of pipes
1.9 parser 69: si.hStdInput=hInRead;
70: si.hStdOutput=hOutWrite;
71: si.hStdError=hErrWrite;
1.1 paf 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);
79:
1.1 paf 80: // Create a child process (suspended)
1.9 parser 81: fCreated=CreateProcess(NULL,
1.26 paf 82: (LPTSTR)szCmdLine,
1.1 paf 83: NULL,
84: NULL,
85: TRUE,
1.30 paf 86: CREATE_NO_WINDOW,
1.1 paf 87: szEnv,
1.31 paf 88: dir,
1.1 paf 89: &si,
1.9 parser 90: ppi);
1.36 paf 91: if(!fCreated)
92: result=GetLastError();
1.1 paf 93:
1.9 parser 94: CloseHandle(hInRead);
95: CloseHandle(hOutWrite);
96: CloseHandle(hErrWrite);
1.1 paf 97:
1.9 parser 98: if(!fCreated)
1.1 paf 99: goto error;
100:
1.36 paf 101: return result;
1.1 paf 102:
103: error:
1.36 paf 104: if(!result/*yet*/)
105: result=GetLastError(); // get it
106:
1.9 parser 107: CloseHandle(*phInWrite);
108: CloseHandle(*phOutRead);
109: CloseHandle(*phErrRead);
1.1 paf 110:
1.36 paf 111: return result;
1.1 paf 112: }
113:
1.48.2.5 paf 114: static void read_pipe(Pool& pool, StringPtr result, HANDLE hOutRead, const char* file_spec,
1.35 paf 115: String::Untaint_lang lang){
1.1 paf 116: while(true) {
1.48.2.2 paf 117: char *buf=new(pool) char[MAX_STRING];
1.1 paf 118: unsigned long size;
1.30 paf 119: if(!ReadFile(hOutRead, buf, MAX_STRING, &size, NULL) || !size)
1.1 paf 120: break;
1.48.2.2 paf 121: result->APPEND(buf, size, lang, file_spec, 0);
1.1 paf 122: }
123: }
124:
1.48.2.11! paf 125: static CharPtr buildCommand(CharPtr file_spec_cstr, ArrayString& argv) {
1.48.2.2 paf 126: CharPtr result=file_spec_cstr;
1.4 paf 127: if(FILE *f=fopen(file_spec_cstr, "r")) {
1.48.2.2 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) {
1.48.2.5 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')) {
1.48.2.2 paf 138: String string(begin, end-begin);
1.1 paf 139: string << " " << file_spec_cstr;
1.8 parser 140: result=string.cstr();
1.1 paf 141: }
142: }
143: }
1.48.2.2 paf 144: } catch(...) {
145: fclose(f);
146: rethrow;
147: }
1.1 paf 148: fclose(f);
149: }
1.48.2.2 paf 150: { // appending argv
151: String string(result);
152: for(int i=0; i<argv.count(); i++) {
153: string << " ";
154: string << *argv[i];
1.8 parser 155: }
156:
1.48.2.2 paf 157: result=string.cstr();
1.8 parser 158: }
159:
160: return result;
1.1 paf 161: }
162:
163: #else
164:
1.48.2.5 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:
1.48.2.8 paf 280: static void read_pipe(Pool& pool, StringPtr result, int file, const char* file_spec, String::Untaint_lang lang){
1.1 paf 281: while(true) {
1.48.2.8 paf 282: char *buf=new(pool) char[MAX_STRING];
1.40 paf 283: ssize_t size=read(file, buf, MAX_STRING);
284: if(size<=0)
1.1 paf 285: break;
1.48.2.8 paf 286: result->APPEND(buf, size, lang, file_spec, 0);
1.1 paf 287: }
288: }
289:
290: #endif
291:
1.48.2.8 paf 292: #ifndef DOXYGEN
293: struct Append_env_pair_info {
1.1 paf 294: #ifdef WIN32
1.48.2.9 paf 295: String* string;
1.1 paf 296: #else
1.48.2.8 paf 297: Pool *pool;
298: char **env_ref;
1.48.2.2 paf 299: #endif
1.48.2.8 paf 300: };
301: #endif
302: ///@test maybe here and at argv construction --- cstr(String::UL_UNSPECIFIED
303: static void append_env_pair(HashStringString::key_type key, HashStringString::value_type value,
304: Append_env_pair_info *info) {
1.48.2.2 paf 305: #ifdef WIN32
1.48.2.8 paf 306: *info->string << key << "=" << value;
307: info->string->APPEND_AS_IS("", 1, 0, 0); // zero byte
1.48.2.2 paf 308: #else
309: String string;
1.48.2.1 paf 310: string << key << "=" << value;
1.1 paf 311:
1.48.2.8 paf 312: *(info->env_ref++)=string.cstr(*info->pool, String::UL_UNSPECIFIED);
1.1 paf 313: #endif
314: }
1.31 paf 315:
1.48.2.2 paf 316: /// @todonow unix part to smart_ptr
317: int pa_exec(Pool& pool,
318: bool forced_allow,
1.48.2.4 paf 319: StringPtr file_spec,
1.48.2.2 paf 320: HashStringString& env,
1.48.2.11! paf 321: ArrayString& argv,
1.48.2.4 paf 322: StringPtr in, StringPtr out, StringPtr err) {
1.28 paf 323: #ifdef NO_PA_EXECS
1.32 paf 324: if(!forced_allow)
1.34 paf 325: throw Exception("parser.runtime",
1.48.2.2 paf 326: file_spec,
1.32 paf 327: "parser execs are disabled [recompile parser without --disable-execs configure option]");
328: #endif
1.28 paf 329:
1.48.2.8 paf 330: char* file_spec_cstr=file_spec->cstr(pool, String::UL_FILE_SPEC);
1.1 paf 331: #ifdef WIN32
332:
333: PROCESS_INFORMATION pi;
334: HANDLE hInWrite, hOutRead, hErrRead;
1.48.2.9 paf 335: CharPtr cmd=buildCommand(file_spec->cstr(String::UL_FILE_SPEC), argv);
1.48.2.2 paf 336: CharPtr env_cstr(0);
337: { // env
338: String string;
1.48.2.9 paf 339: Append_env_pair_info info={&string};
340: env.for_each(append_env_pair, &info);
341: env_cstr=info.string->cstr(String::UL_UNSPECIFIED);
1.1 paf 342: }
1.36 paf 343: if(DWORD error=CreateHiddenConsoleProcess(cmd, env_cstr, &pi, &hInWrite, &hOutRead, &hErrRead)) {
344: char szErrorDesc[MAX_STRING];
1.48.2.6 paf 345: const char *param="the file you tried to run";
1.36 paf 346: size_t error_size=FormatMessage(
347: FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_ARGUMENT_ARRAY , NULL, error,
348: MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL),
1.48.2.7 paf 349: szErrorDesc, sizeof(szErrorDesc), (va_list *)¶m);
1.36 paf 350: if(error_size>3) // ".\r\n"
351: szErrorDesc[error_size-3]=0;
352:
353: throw Exception(0,
1.48.2.2 paf 354: file_spec,
1.36 paf 355: "exec failed - %s (%ld). Consider adding shbang line (#!x:\\interpreter\\command line)",
356: error_size?szErrorDesc:"<unknown>", (long)error);
357: } else {
1.48.2.2 paf 358: CharPtr in_cstr=in->cstr();
1.5 paf 359: DWORD written_size;
1.48.2.2 paf 360: WriteFile(hInWrite, in_cstr, in->size(), &written_size, NULL);
1.5 paf 361: // EOF for stupid text reads
362: // normally they should read CONTENT_LENGTH bytes,
363: // without this char
364: WriteFile(hInWrite, "\x1A", 1, &written_size, NULL);
1.9 parser 365: CloseHandle(hInWrite);
1.48.2.2 paf 366: read_pipe(pool, out, hOutRead, file_spec_cstr, String::UL_AS_IS);
1.9 parser 367: CloseHandle(hOutRead);
1.48.2.2 paf 368: read_pipe(pool, err, hErrRead, file_spec_cstr, String::UL_TAINTED);
1.9 parser 369: CloseHandle(hErrRead);
1.1 paf 370: /*
371: 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
372:
373: * We must close the handles to the new process and its main thread
374: * to prevent handle and memory leaks.
375: */
376: CloseHandle(pi.hProcess);
377: CloseHandle(pi.hThread);
378: }
379:
380: #else
381:
382: int pipe_write, pipe_read, pipe_err;
1.31 paf 383:
1.47 paf 384: #ifdef PA_SAFE_MODE
1.32 paf 385: if(!forced_allow) {
386: struct stat finfo;
387: if(stat(file_spec_cstr, &finfo)!=0)
1.34 paf 388: throw Exception("file.missing",
1.48.2.8 paf 389: file_spec,
1.32 paf 390: "stat failed: %s (%d), actual filename '%s'",
391: strerror(errno), errno, file_spec_cstr);
1.31 paf 392:
1.47 paf 393: if(finfo.st_uid/*foreign?*/!=geteuid()
394: && finfo.st_gid/*foreign?*/!=getegid())
395: throw Exception("parser.runtime",
1.48.2.8 paf 396: file_spec,
1.47 paf 397: "parser is in safe mode: executing files of foreign group and user disabled [recompile parser with --disable-safe-mode configure option], actual filename '%s'",
1.32 paf 398: file_spec_cstr);
399: }
1.31 paf 400: #endif
401:
1.48.2.8 paf 402: char * argv_cstrs[1+10+1]={file_spec_cstr, 0};
403: const int argv_size=argv.count();
404: const int argv_max=sizeof(argv_cstrs)/sizeof(argv_cstrs[0])-1-1;
405: if(argv_size>argv_max)
406: throw Exception("parser.runtime",
407: file_spec,
408: "too many arguments (%d > max %d)", argv_size, argv_max);
409: for(int i=0; i<argv_size; i++)
410: argv_cstrs[1+i]=argv[i]->cstr(pool);
411: argv_cstrs[1+argv_size]=0;
412:
413: char **env_cstrs=new(pool) char *[env.count()+1/*0*/];
414: {
415: Append_env_pair_info info={&pool, env_cstrs};
416: env.for_each(append_env_pair, &info);
417: *info.env_ref=0;
1.1 paf 418: }
1.31 paf 419:
1.46 paf 420: pid_t pid=execve_piped(
1.1 paf 421: file_spec_cstr,
1.27 paf 422: argv_cstrs, env_cstrs,
1.22 paf 423: &pipe_write, &pipe_read, &pipe_err);
1.46 paf 424: if(pid>0) {
1.21 paf 425: // in child
1.48.2.8 paf 426: if(in && in->size()) {// there is some in data
427: CharPtr in_cstr=in->cstr();
428: write(pipe_write, in_cstr, in->size());
429: }
1.1 paf 430: close(pipe_write);
1.48.2.8 paf 431: read_pipe(pool, out, pipe_read, file_spec_cstr, String::UL_AS_IS);
1.5 paf 432: close(pipe_read);
1.48.2.8 paf 433: read_pipe(pool, err, pipe_err, file_spec_cstr, String::UL_TAINTED);
1.1 paf 434: close(pipe_err);
435:
436: return get_exit_status(pid); // negative may mean "-errno[execl()]"
437: } else
1.34 paf 438: throw Exception(0,
1.48.2.8 paf 439: file_spec,
1.46 paf 440: "%s error: %s (%d)", pid<0?"fork":"pipe", strerror(errno), errno);
1.1 paf 441: #endif
442:
443: return 0;
444: }
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