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1.1 paf 1: /** @file
2: Parser: program executing for different OS-es.
3:
1.24 paf 4: Copyright(c) 2000,2001, 2002 ArtLebedev Group(http://www.artlebedev.com)
1.25 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 paf 6:
1.33 ! paf 7: $Id: pa_exec.C,v 1.32 2002/03/25 11:55:26 paf Exp $
1.18 paf 8:
9:
10: @todo setrlimit
1.1 paf 11: */
12:
13: #include "pa_config_includes.h"
14:
1.19 paf 15: #include "pa_exec.h"
16: #include "pa_exception.h"
17: #include "pa_common.h"
18:
1.1 paf 19: #ifdef WIN32
20: # include <windows.h>
21: #else
22: # include <signal.h>
23: # include <sys/types.h>
24: # include <sys/wait.h>
25: #endif
26:
27: #ifdef WIN32
28:
29: /// this func from http://www.ccas.ru/~posp/popov/spawn.htm
1.26 paf 30: static BOOL WINAPI CreateHiddenConsoleProcess(LPCTSTR szCmdLine,
1.1 paf 31: char *szEnv,
32: PROCESS_INFORMATION* ppi,
33: LPHANDLE phInWrite,
34: LPHANDLE phOutRead,
1.9 parser 35: LPHANDLE phErrRead)
1.1 paf 36: {
37: BOOL fCreated;
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);
1.1 paf 91:
1.9 parser 92: CloseHandle(hInRead);
93: CloseHandle(hOutWrite);
94: CloseHandle(hErrWrite);
1.1 paf 95:
1.9 parser 96: if(!fCreated)
1.1 paf 97: goto error;
98:
99: return TRUE;
100:
101: error:
1.9 parser 102: CloseHandle(*phInWrite);
103: CloseHandle(*phOutRead);
104: CloseHandle(*phErrRead);
1.1 paf 105:
106: return FALSE;
107: }
108:
1.2 paf 109: static void read_pipe(String& result, HANDLE hOutRead, const char *file_spec){
1.1 paf 110: while(true) {
111: char *buf=(char *)result.pool().malloc(MAX_STRING);
112: unsigned long size;
1.30 paf 113: if(!ReadFile(hOutRead, buf, MAX_STRING, &size, NULL) || !size)
1.1 paf 114: break;
1.3 paf 115: result.APPEND_AS_IS(buf, size, file_spec, 0);
1.1 paf 116: }
117: }
118:
119:
120: static const char *buildCommand(Pool& pool,
121: const String& origin_string,
122: const char *file_spec_cstr, const Array *argv) {
1.8 parser 123: const char *result=file_spec_cstr;
1.4 paf 124: if(FILE *f=fopen(file_spec_cstr, "r")) {
1.1 paf 125: char buf[MAX_STRING];
126: size_t size=fread(buf, 1, MAX_STRING-1, f);
127: if(size>2) {
128: buf[size]=0;
129: if(strncmp(buf, "#!", 2)==0) {
1.4 paf 130: const char *begin=buf+2;
131: if(*begin==' ') // alx: were an old magic for some linux-es
132: begin++;
133: if(char *end=strchr(begin, '\n')) {
1.1 paf 134: String string(pool);
1.4 paf 135: string.APPEND_AS_IS(begin, end-begin,
1.1 paf 136: origin_string.origin().file, 0);
137: string << " " << file_spec_cstr;
138: if(argv)
139: for(int i=0; i<argv->size(); i++)
1.16 paf 140: string << argv->get_string(i)->cstr();
1.8 parser 141: result=string.cstr();
1.1 paf 142: }
143: }
144: }
145: fclose(f);
146: }
1.8 parser 147: if(argv) {
148: String buf(pool);
149: buf << result;
150: for(int i=0; i<argv->size(); i++) {
151: buf << " ";
152: buf << *argv->get_string(i);
153: }
154:
1.16 paf 155: result=buf.cstr();
1.8 parser 156: }
157:
158: return result;
1.1 paf 159: }
160:
161: #else
162:
1.31 paf 163: static int execve_piped(const char *file_spec_cstr,
1.27 paf 164: char * const argv[], char * const env[],
165: int *pipe_in, int *pipe_out, int *pipe_err) {
1.1 paf 166: int pid;
167: int in_fds[2];
168: int out_fds[2];
169: int err_fds[2];
170: int save_errno;
171:
172: if(pipe_in && pipe(in_fds)<0) {
173: save_errno=errno;
174: errno=save_errno;
175: return 0;
176: }
177:
178: if(pipe_out && pipe(out_fds)<0) {
179: save_errno=errno;
180: if(pipe_in) {
181: close(in_fds[0]); close(in_fds[1]);
182: }
183: errno=save_errno;
184: return 0;
185: }
186:
187: if(pipe_err && pipe(err_fds)<0) {
188: save_errno=errno;
189: if(pipe_in) {
190: close(in_fds[0]); close(in_fds[1]);
191: }
192: if(pipe_out) {
193: close(out_fds[0]); close(out_fds[1]);
194: }
195: errno=save_errno;
196: return 0;
197: }
198:
199: if((pid=fork())<0) {
200: save_errno=errno;
201: if(pipe_in) {
202: close(in_fds[0]); close(in_fds[1]);
203: }
204: if(pipe_out) {
205: close(out_fds[0]); close(out_fds[1]);
206: }
207: if(pipe_err) {
208: close(err_fds[0]); close(err_fds[1]);
209: }
210: errno=save_errno;
211: return 0;
212: }
213:
214: if(!pid) {
215: /* Child process */
216:
217: if(pipe_out) {
218: close(out_fds[0]);
219: dup2(out_fds[1], STDOUT_FILENO);
220: close(out_fds[1]);
221: }
222:
223: if(pipe_in) {
224: close(in_fds[1]);
225: dup2(in_fds[0], STDIN_FILENO);
226: close(in_fds[0]);
227: }
228:
229: if(pipe_err) {
230: close(err_fds[0]);
231: dup2(err_fds[1], STDERR_FILENO);
232: close(err_fds[1]);
233: }
234:
235: /* HP-UX SIGCHLD fix goes here, if someone will remind me what it is... */
236: signal(SIGCHLD, SIG_DFL); /* Was that it? */
237:
1.31 paf 238: // chdir to script's directory
239: char dir[MAX_STRING];
240: strncpy(dir, file_spec_cstr, MAX_STRING-1); dir[MAX_STRING-1]=0;
241: rsplit(dir,'/'); // trim filename
242: chdir(dir);
243:
244: // execute
245: execve(file_spec_cstr, argv, env);
1.1 paf 246: exit(-errno);
247: }
248:
249: /* Parent process */
250:
251: if(pipe_out) {
252: close(out_fds[1]);
253: *pipe_out=out_fds[0];
254: }
255:
256: if(pipe_in) {
257: close(in_fds[0]);
258: *pipe_in=in_fds[1];
259: }
260:
261: if(pipe_err) {
262: close(err_fds[1]);
263: *pipe_err=err_fds[0];
264: }
265:
266: return pid;
267: }
268:
269: static int get_exit_status(int pid) {
270: int status;
271: if(!waitpid(pid, &status, 0))
272: return -1;
273: return WIFEXITED(status) ?
274: WEXITSTATUS(status) : -2;
275: }
276:
1.2 paf 277: static void read_pipe(String& result, int file, const char *file_spec){
1.1 paf 278: while(true) {
1.2 paf 279: char *buf=(char *)result.pool().malloc(MAX_STRING);
1.1 paf 280: size_t size=read(file, buf, MAX_STRING);
1.30 paf 281: if(!size)
1.1 paf 282: break;
1.3 paf 283: result.APPEND_AS_IS(buf, size, file_spec, 0);
1.1 paf 284: }
285: }
286:
287: #endif
288:
1.30 paf 289: ///@test maybe here and at argv construction --- cstr(String::UL_UNSPECIFIED
1.1 paf 290: static void append_env_pair(const Hash::Key& key, Hash::Val *value, void *info) {
291: #ifdef WIN32
292: String& string=*static_cast<String *>(info);
293:
294: string << key << "=" << *static_cast<String *>(value);
1.3 paf 295: string.APPEND_AS_IS("", 1, 0, 0); // zero byte
1.1 paf 296: #else
297: String string(key.pool());
298: string << key << "=" << *static_cast<String *>(value);
299:
1.2 paf 300: char ***env_ref=static_cast<char ***>(info);
301: **env_ref=string.cstr(); (*env_ref)++;
1.1 paf 302: #endif
303: }
1.31 paf 304:
1.32 paf 305: int pa_exec(
306: bool forced_allow,
307: const String& file_spec,
1.1 paf 308: const Hash *env,
309: const Array *argv,
310: const String& in, String& out, String& err) {
311: Pool& pool=file_spec.pool();
312:
1.28 paf 313: #ifdef NO_PA_EXECS
1.32 paf 314: if(!forced_allow)
315: throw Exception(0, 0,
316: &file_spec,
317: "parser execs are disabled [recompile parser without --disable-execs configure option]");
318: #endif
1.28 paf 319:
1.1 paf 320: #ifdef WIN32
321:
322: PROCESS_INFORMATION pi;
323: HANDLE hInWrite, hOutRead, hErrRead;
1.12 parser 324: char *file_spec_cstr=file_spec.cstr(String::UL_FILE_SPEC);
1.1 paf 325: const char *cmd=buildCommand(file_spec.pool(), file_spec, file_spec_cstr, argv);
326: char *env_cstr=0;
327: if(env) {
328: String string(env->pool());
329: env->for_each(append_env_pair, &string);
1.16 paf 330: env_cstr=string.cstr();
1.1 paf 331: }
1.9 parser 332: if(CreateHiddenConsoleProcess(cmd, env_cstr, &pi, &hInWrite, &hOutRead, &hErrRead)) {
1.16 paf 333: const char *in_cstr=in.cstr();
1.5 paf 334: DWORD written_size;
335: WriteFile(hInWrite, in_cstr, in.size(), &written_size, NULL);
336: // EOF for stupid text reads
337: // normally they should read CONTENT_LENGTH bytes,
338: // without this char
339: WriteFile(hInWrite, "\x1A", 1, &written_size, NULL);
1.9 parser 340: CloseHandle(hInWrite);
1.1 paf 341: read_pipe(out, hOutRead, file_spec_cstr);
1.9 parser 342: CloseHandle(hOutRead);
1.5 paf 343: read_pipe(err, hErrRead, file_spec_cstr);
1.9 parser 344: CloseHandle(hErrRead);
1.1 paf 345: /*
346: 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
347:
348: * We must close the handles to the new process and its main thread
349: * to prevent handle and memory leaks.
350: */
351: CloseHandle(pi.hProcess);
352: CloseHandle(pi.hThread);
353: } else {
354: DWORD error=GetLastError();
355: char szErrorDesc[MAX_STRING];
356: FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error,
357: MAKELANGID(LANG_NEUTRAL, SUBLANG_NEUTRAL),
358: szErrorDesc, sizeof(szErrorDesc), NULL);
359: size_t error_size=strlen(szErrorDesc);
360: if(error_size>3) // ".\r\n"
361: szErrorDesc[error_size-3]=0;
362:
1.15 parser 363: throw Exception(0, 0,
1.1 paf 364: &file_spec,
1.26 paf 365: "(real command line=\"%s\") exec failed - %s (%ld)",
1.11 parser 366: cmd,
1.10 parser 367: szErrorDesc, (long)error);
1.1 paf 368: }
369:
370: #else
371:
372: int pipe_write, pipe_read, pipe_err;
1.27 paf 373: char *file_spec_cstr=file_spec.cstr(String::UL_FILE_SPEC);
1.31 paf 374:
375: #ifdef NO_FOREIGN_GROUP_FILES
1.32 paf 376: if(!forced_allow) {
377: struct stat finfo;
378: if(stat(file_spec_cstr, &finfo)!=0)
379: throw Exception(0, 0,
380: &file_spec,
381: "stat failed: %s (%d), actual filename '%s'",
382: strerror(errno), errno, file_spec_cstr);
1.31 paf 383:
1.32 paf 384: if(finfo.st_gid/*foreign?*/!=getegid())
385: throw Exception(0, 0,
386: &file_spec,
387: "parser executing files of foreign group is disabled [recompile parser without --disable-foreign-group-files configure option], actual filename '%s'",
388: file_spec_cstr);
389: }
1.31 paf 390: #endif
391:
1.27 paf 392: char *argv_cstrs[1+10+1]={file_spec_cstr, 0};
1.1 paf 393: if(argv) {
1.20 paf 394: const int argv_size=argv->size();
1.27 paf 395: const int argv_max=sizeof(argv_cstrs)/sizeof(argv_cstrs[0])-1-1;
1.20 paf 396: if(argv_size>argv_max)
397: throw Exception(0, 0,
398: &file_spec,
399: "too many arguments (%d > max %d)", argv_size, argv_max);
400: for(int i=0; i<argv_size; i++)
1.27 paf 401: argv_cstrs[1+i]=argv->get_string(i)->cstr();
402: argv_cstrs[1+argv_size]=0;
1.1 paf 403: }
1.2 paf 404: char **env_cstrs=0;
1.1 paf 405: if(env) {
1.2 paf 406: env_cstrs=
1.1 paf 407: (char **)env->pool().malloc(sizeof(char *)*(env->size()+1/*0*/));
1.2 paf 408: char **env_ref=env_cstrs;
409: env->for_each(append_env_pair, &env_ref);
410: *env_ref=0;
1.1 paf 411: }
1.31 paf 412:
1.27 paf 413: int pid=execve_piped(
1.1 paf 414: file_spec_cstr,
1.27 paf 415: argv_cstrs, env_cstrs,
1.22 paf 416: &pipe_write, &pipe_read, &pipe_err);
1.21 paf 417: if(pid) {
418: // in child
1.16 paf 419: const char *in_cstr=in.cstr();
1.1 paf 420: write(pipe_write, in_cstr, in.size());
421: close(pipe_write);
422: read_pipe(out, pipe_read, file_spec_cstr);
1.5 paf 423: close(pipe_read);
1.1 paf 424: read_pipe(err, pipe_err, file_spec_cstr);
425: close(pipe_err);
426:
427: return get_exit_status(pid); // negative may mean "-errno[execl()]"
428: } else
1.15 parser 429: throw Exception(0, 0,
1.2 paf 430: &file_spec,
1.1 paf 431: "pipe error");
432: #endif
433:
434: return 0;
435: }