1: /* Provide relocatable programs.
2: Copyright (C) 2003-2011 Free Software Foundation, Inc.
3: Written by Bruno Haible <bruno@clisp.org>, 2003.
4:
5: This program is free software: you can redistribute it and/or modify
6: it under the terms of the GNU General Public License as published by
7: the Free Software Foundation; either version 3 of the License, or
8: (at your option) any later version.
9:
10: This program is distributed in the hope that it will be useful,
11: but WITHOUT ANY WARRANTY; without even the implied warranty of
12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13: GNU General Public License for more details.
14:
15: You should have received a copy of the GNU General Public License
16: along with this program. If not, see <http://www.gnu.org/licenses/>. */
17:
18:
19: #define _GL_USE_STDLIB_ALLOC 1
20: #include <config.h>
21:
22: /* Specification. */
23: #include "progname.h"
24:
25: #include <stdbool.h>
26: #include <stdio.h>
27: #include <stdlib.h>
28: #include <string.h>
29: #include <fcntl.h>
30: #include <unistd.h>
31: #include <sys/stat.h>
32:
33: /* Get declaration of _NSGetExecutablePath on MacOS X 10.2 or newer. */
34: #if HAVE_MACH_O_DYLD_H
35: # include <mach-o/dyld.h>
36: #endif
37:
38: #if (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__
39: # define WIN32_NATIVE
40: #endif
41:
42: #ifdef WIN32_NATIVE
43: # define WIN32_LEAN_AND_MEAN
44: # include <windows.h>
45: #endif
46:
47: #include "relocatable.h"
48:
49: #ifdef NO_XMALLOC
50: # include "areadlink.h"
51: # define xreadlink areadlink
52: #else
53: # include "xreadlink.h"
54: #endif
55:
56: #ifdef NO_XMALLOC
57: # define xmalloc malloc
58: # define xstrdup strdup
59: #else
60: # include "xalloc.h"
61: #endif
62:
63: #ifndef O_EXEC
64: # define O_EXEC O_RDONLY /* This is often close enough in older systems. */
65: #endif
66:
67: /* Declare canonicalize_file_name.
68: The <stdlib.h> included above may be the system's one, not the gnulib
69: one. */
70: extern char * canonicalize_file_name (const char *name);
71:
72: /* Pathname support.
73: ISSLASH(C) tests whether C is a directory separator character.
74: IS_PATH_WITH_DIR(P) tests whether P contains a directory specification.
75: */
76: #if ((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__) || defined __EMX__ || defined __DJGPP__
77: /* Win32, OS/2, DOS */
78: # define ISSLASH(C) ((C) == '/' || (C) == '\\')
79: # define HAS_DEVICE(P) \
80: ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \
81: && (P)[1] == ':')
82: # define IS_PATH_WITH_DIR(P) \
83: (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P))
84: # define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
85: #else
86: /* Unix */
87: # define ISSLASH(C) ((C) == '/')
88: # define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL)
89: # define FILE_SYSTEM_PREFIX_LEN(P) 0
90: #endif
91:
92: /* The results of open() in this file are not used with fchdir,
93: therefore save some unnecessary work in fchdir.c. */
94: #undef open
95: #undef close
96:
97: /* Use the system functions, not the gnulib overrides in this file. */
98: #undef sprintf
99:
100: #undef set_program_name
101:
102:
103: #if ENABLE_RELOCATABLE
104:
105: #if defined __linux__ || defined __CYGWIN__
106: /* File descriptor of the executable.
107: (Only used to verify that we find the correct executable.) */
108: static int executable_fd = -1;
109: #endif
110:
111: /* Tests whether a given pathname may belong to the executable. */
112: static bool
113: maybe_executable (const char *filename)
114: {
115: /* Woe32 lacks the access() function. */
116: #if !defined WIN32_NATIVE
117: if (access (filename, X_OK) < 0)
118: return false;
119: #endif
120:
121: #if defined __linux__ || defined __CYGWIN__
122: if (executable_fd >= 0)
123: {
124: /* If we already have an executable_fd, check that filename points to
125: the same inode. */
126: struct stat statexe;
127: struct stat statfile;
128:
129: if (fstat (executable_fd, &statexe) >= 0)
130: {
131: if (stat (filename, &statfile) < 0)
132: return false;
133: if (!(statfile.st_dev
134: && statfile.st_dev == statexe.st_dev
135: && statfile.st_ino == statexe.st_ino))
136: return false;
137: }
138: }
139: #endif
140:
141: return true;
142: }
143:
144: /* Determine the full pathname of the current executable, freshly allocated.
145: Return NULL if unknown.
146: Guaranteed to work on Linux and Woe32. Likely to work on the other
147: Unixes (maybe except BeOS), under most conditions. */
148: static char *
149: find_executable (const char *argv0)
150: {
151: #if defined WIN32_NATIVE
152: /* Native Win32 only.
153: On Cygwin, it is better to use the Cygwin provided /proc interface, than
154: to use native Win32 API and cygwin_conv_to_posix_path, because it supports
155: longer file names
156: (see <http://cygwin.com/ml/cygwin/2011-01/msg00410.html>). */
157: char location[MAX_PATH];
158: int length = GetModuleFileName (NULL, location, sizeof (location));
159: if (length < 0)
160: return NULL;
161: if (!IS_PATH_WITH_DIR (location))
162: /* Shouldn't happen. */
163: return NULL;
164: return xstrdup (location);
165: #else /* Unix */
166: # ifdef __linux__
167: /* The executable is accessible as /proc/<pid>/exe. In newer Linux
168: versions, also as /proc/self/exe. Linux >= 2.1 provides a symlink
169: to the true pathname; older Linux versions give only device and ino,
170: enclosed in brackets, which we cannot use here. */
171: {
172: char *link;
173:
174: link = xreadlink ("/proc/self/exe");
175: if (link != NULL && link[0] != '[')
176: return link;
177: if (executable_fd < 0)
178: executable_fd = open ("/proc/self/exe", O_EXEC, 0);
179:
180: {
181: char buf[6+10+5];
182: sprintf (buf, "/proc/%d/exe", getpid ());
183: link = xreadlink (buf);
184: if (link != NULL && link[0] != '[')
185: return link;
186: if (executable_fd < 0)
187: executable_fd = open (buf, O_EXEC, 0);
188: }
189: }
190: # endif
191: # ifdef __CYGWIN__
192: /* The executable is accessible as /proc/<pid>/exe, at least in
193: Cygwin >= 1.5. */
194: {
195: char *link;
196:
197: link = xreadlink ("/proc/self/exe");
198: if (link != NULL)
199: return link;
200: if (executable_fd < 0)
201: executable_fd = open ("/proc/self/exe", O_EXEC, 0);
202: }
203: # endif
204: # if HAVE_MACH_O_DYLD_H && HAVE__NSGETEXECUTABLEPATH
205: /* On MacOS X 10.2 or newer, the function
206: int _NSGetExecutablePath (char *buf, uint32_t *bufsize);
207: can be used to retrieve the executable's full path. */
208: char location[4096];
209: unsigned int length = sizeof (location);
210: if (_NSGetExecutablePath (location, &length) == 0
211: && location[0] == '/')
212: return canonicalize_file_name (location);
213: # endif
214: /* Guess the executable's full path. We assume the executable has been
215: called via execlp() or execvp() with properly set up argv[0]. The
216: login(1) convention to add a '-' prefix to argv[0] is not supported. */
217: {
218: bool has_slash = false;
219: {
220: const char *p;
221: for (p = argv0; *p; p++)
222: if (*p == '/')
223: {
224: has_slash = true;
225: break;
226: }
227: }
228: if (!has_slash)
229: {
230: /* exec searches paths without slashes in the directory list given
231: by $PATH. */
232: const char *path = getenv ("PATH");
233:
234: if (path != NULL)
235: {
236: const char *p;
237: const char *p_next;
238:
239: for (p = path; *p; p = p_next)
240: {
241: const char *q;
242: size_t p_len;
243: char *concat_name;
244:
245: for (q = p; *q; q++)
246: if (*q == ':')
247: break;
248: p_len = q - p;
249: p_next = (*q == '\0' ? q : q + 1);
250:
251: /* We have a path item at p, of length p_len.
252: Now concatenate the path item and argv0. */
253: concat_name = (char *) xmalloc (p_len + strlen (argv0) + 2);
254: # ifdef NO_XMALLOC
255: if (concat_name == NULL)
256: return NULL;
257: # endif
258: if (p_len == 0)
259: /* An empty PATH element designates the current directory. */
260: strcpy (concat_name, argv0);
261: else
262: {
263: memcpy (concat_name, p, p_len);
264: concat_name[p_len] = '/';
265: strcpy (concat_name + p_len + 1, argv0);
266: }
267: if (maybe_executable (concat_name))
268: return canonicalize_file_name (concat_name);
269: free (concat_name);
270: }
271: }
272: /* Not found in the PATH, assume the current directory. */
273: }
274: /* exec treats paths containing slashes as relative to the current
275: directory. */
276: if (maybe_executable (argv0))
277: return canonicalize_file_name (argv0);
278: }
279: /* No way to find the executable. */
280: return NULL;
281: #endif
282: }
283:
284: /* Full pathname of executable, or NULL. */
285: static char *executable_fullname;
286:
287: static void
288: prepare_relocate (const char *orig_installprefix, const char *orig_installdir,
289: const char *argv0)
290: {
291: char *curr_prefix;
292:
293: /* Determine the full pathname of the current executable. */
294: executable_fullname = find_executable (argv0);
295:
296: /* Determine the current installation prefix from it. */
297: curr_prefix = compute_curr_prefix (orig_installprefix, orig_installdir,
298: executable_fullname);
299: if (curr_prefix != NULL)
300: {
301: /* Now pass this prefix to all copies of the relocate.c source file. */
302: set_relocation_prefix (orig_installprefix, curr_prefix);
303:
304: free (curr_prefix);
305: }
306: }
307:
308: /* Set program_name, based on argv[0], and original installation prefix and
309: directory, for relocatability. */
310: void
311: set_program_name_and_installdir (const char *argv0,
312: const char *orig_installprefix,
313: const char *orig_installdir)
314: {
315: const char *argv0_stripped = argv0;
316:
317: /* Relocatable programs are renamed to .bin by install-reloc. Or, more
318: generally, their suffix is changed from $exeext to .bin$exeext.
319: Remove the ".bin" here. */
320: {
321: size_t argv0_len = strlen (argv0);
322: const size_t exeext_len = sizeof (EXEEXT) - sizeof ("");
323: if (argv0_len > 4 + exeext_len)
324: if (memcmp (argv0 + argv0_len - exeext_len - 4, ".bin", 4) == 0)
325: {
326: if (sizeof (EXEEXT) > sizeof (""))
327: {
328: /* Compare using an inlined copy of c_strncasecmp(), because
329: the filenames may have undergone a case conversion since
330: they were packaged. In other words, EXEEXT may be ".exe"
331: on one system and ".EXE" on another. */
332: static const char exeext[] = EXEEXT;
333: const char *s1 = argv0 + argv0_len - exeext_len;
334: const char *s2 = exeext;
335: for (; *s1 != '\0'; s1++, s2++)
336: {
337: unsigned char c1 = *s1;
338: unsigned char c2 = *s2;
339: if ((c1 >= 'A' && c1 <= 'Z' ? c1 - 'A' + 'a' : c1)
340: != (c2 >= 'A' && c2 <= 'Z' ? c2 - 'A' + 'a' : c2))
341: goto done_stripping;
342: }
343: }
344: /* Remove ".bin" before EXEEXT or its equivalent. */
345: {
346: char *shorter = (char *) xmalloc (argv0_len - 4 + 1);
347: #ifdef NO_XMALLOC
348: if (shorter != NULL)
349: #endif
350: {
351: memcpy (shorter, argv0, argv0_len - exeext_len - 4);
352: if (sizeof (EXEEXT) > sizeof (""))
353: memcpy (shorter + argv0_len - exeext_len - 4,
354: argv0 + argv0_len - exeext_len - 4,
355: exeext_len);
356: shorter[argv0_len - 4] = '\0';
357: argv0_stripped = shorter;
358: }
359: }
360: done_stripping: ;
361: }
362: }
363:
364: set_program_name (argv0_stripped);
365:
366: prepare_relocate (orig_installprefix, orig_installdir, argv0);
367: }
368:
369: /* Return the full pathname of the current executable, based on the earlier
370: call to set_program_name_and_installdir. Return NULL if unknown. */
371: char *
372: get_full_program_name (void)
373: {
374: return executable_fullname;
375: }
376:
377: #endif
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