1: /* Provide relocatable programs.
2: Copyright (C) 2003-2009 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: #include <config.h>
20:
21: /* Specification. */
22: #include "progname.h"
23:
24: #include <stdbool.h>
25: #include <stdio.h>
26: #include <stdlib.h>
27: #include <string.h>
28: #include <fcntl.h>
29: #include <unistd.h>
30: #include <sys/stat.h>
31:
32: /* Get declaration of _NSGetExecutablePath on MacOS X 10.2 or newer. */
33: #if HAVE_MACH_O_DYLD_H
34: # include <mach-o/dyld.h>
35: #endif
36:
37: #if defined _WIN32 || defined __WIN32__
38: # define WIN32_NATIVE
39: #endif
40:
41: #if defined WIN32_NATIVE || defined __CYGWIN__
42: # define WIN32_LEAN_AND_MEAN
43: # include <windows.h>
44: #endif
45:
46: #include "canonicalize.h"
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: /* Pathname support.
64: ISSLASH(C) tests whether C is a directory separator character.
65: IS_PATH_WITH_DIR(P) tests whether P contains a directory specification.
66: */
67: #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__
68: /* Win32, Cygwin, OS/2, DOS */
69: # define ISSLASH(C) ((C) == '/' || (C) == '\\')
70: # define HAS_DEVICE(P) \
71: ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \
72: && (P)[1] == ':')
73: # define IS_PATH_WITH_DIR(P) \
74: (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P))
75: # define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
76: #else
77: /* Unix */
78: # define ISSLASH(C) ((C) == '/')
79: # define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL)
80: # define FILE_SYSTEM_PREFIX_LEN(P) 0
81: #endif
82:
83: /* The results of open() in this file are not used with fchdir,
84: therefore save some unnecessary work in fchdir.c. */
85: #undef open
86: #undef close
87:
88: #undef set_program_name
89:
90:
91: #if ENABLE_RELOCATABLE
92:
93: #ifdef __linux__
94: /* File descriptor of the executable.
95: (Only used to verify that we find the correct executable.) */
96: static int executable_fd = -1;
97: #endif
98:
99: /* Tests whether a given pathname may belong to the executable. */
100: static bool
101: maybe_executable (const char *filename)
102: {
103: /* Woe32 lacks the access() function, but Cygwin doesn't. */
104: #if !(defined WIN32_NATIVE && !defined __CYGWIN__)
105: if (access (filename, X_OK) < 0)
106: return false;
107:
108: #ifdef __linux__
109: if (executable_fd >= 0)
110: {
111: /* If we already have an executable_fd, check that filename points to
112: the same inode. */
113: struct stat statexe;
114: struct stat statfile;
115:
116: if (fstat (executable_fd, &statexe) >= 0)
117: {
118: if (stat (filename, &statfile) < 0)
119: return false;
120: if (!(statfile.st_dev
121: && statfile.st_dev == statexe.st_dev
122: && statfile.st_ino == statexe.st_ino))
123: return false;
124: }
125: }
126: #endif
127: #endif
128:
129: return true;
130: }
131:
132: /* Determine the full pathname of the current executable, freshly allocated.
133: Return NULL if unknown.
134: Guaranteed to work on Linux and Woe32. Likely to work on the other
135: Unixes (maybe except BeOS), under most conditions. */
136: static char *
137: find_executable (const char *argv0)
138: {
139: #if defined WIN32_NATIVE || defined __CYGWIN__
140: char location[MAX_PATH];
141: int length = GetModuleFileName (NULL, location, sizeof (location));
142: if (length < 0)
143: return NULL;
144: if (!IS_PATH_WITH_DIR (location))
145: /* Shouldn't happen. */
146: return NULL;
147: {
148: #if defined __CYGWIN__
149: /* cygwin-1.5.13 (2005-03-01) or newer would also allow a Linux-like
150: implementation: readlink of "/proc/self/exe". But using the
151: result of the Win32 system call is simpler and is consistent with the
152: code in relocatable.c. */
153: /* On Cygwin, we need to convert paths coming from Win32 system calls
154: to the Unix-like slashified notation. */
155: static char location_as_posix_path[2 * MAX_PATH];
156: /* There's no error return defined for cygwin_conv_to_posix_path.
157: See cygwin-api/func-cygwin-conv-to-posix-path.html.
158: Does it overflow the buffer of expected size MAX_PATH or does it
159: truncate the path? I don't know. Let's catch both. */
160: cygwin_conv_to_posix_path (location, location_as_posix_path);
161: location_as_posix_path[MAX_PATH - 1] = '\0';
162: if (strlen (location_as_posix_path) >= MAX_PATH - 1)
163: /* A sign of buffer overflow or path truncation. */
164: return NULL;
165: /* Call canonicalize_file_name, because Cygwin supports symbolic links. */
166: return canonicalize_file_name (location_as_posix_path);
167: #else
168: return xstrdup (location);
169: #endif
170: }
171: #else /* Unix && !Cygwin */
172: #ifdef __linux__
173: /* The executable is accessible as /proc/<pid>/exe. In newer Linux
174: versions, also as /proc/self/exe. Linux >= 2.1 provides a symlink
175: to the true pathname; older Linux versions give only device and ino,
176: enclosed in brackets, which we cannot use here. */
177: {
178: char *link;
179:
180: link = xreadlink ("/proc/self/exe");
181: if (link != NULL && link[0] != '[')
182: return link;
183: if (executable_fd < 0)
184: executable_fd = open ("/proc/self/exe", O_RDONLY, 0);
185:
186: {
187: char buf[6+10+5];
188: sprintf (buf, "/proc/%d/exe", getpid ());
189: link = xreadlink (buf);
190: if (link != NULL && link[0] != '[')
191: return link;
192: if (executable_fd < 0)
193: executable_fd = open (buf, O_RDONLY, 0);
194: }
195: }
196: #endif
197: #if HAVE_MACH_O_DYLD_H && HAVE__NSGETEXECUTABLEPATH
198: /* On MacOS X 10.2 or newer, the function
199: int _NSGetExecutablePath (char *buf, uint32_t *bufsize);
200: can be used to retrieve the executable's full path. */
201: char location[4096];
202: unsigned int length = sizeof (location);
203: if (_NSGetExecutablePath (location, &length) == 0
204: && location[0] == '/')
205: return canonicalize_file_name (location);
206: #endif
207: /* Guess the executable's full path. We assume the executable has been
208: called via execlp() or execvp() with properly set up argv[0]. The
209: login(1) convention to add a '-' prefix to argv[0] is not supported. */
210: {
211: bool has_slash = false;
212: {
213: const char *p;
214: for (p = argv0; *p; p++)
215: if (*p == '/')
216: {
217: has_slash = true;
218: break;
219: }
220: }
221: if (!has_slash)
222: {
223: /* exec searches paths without slashes in the directory list given
224: by $PATH. */
225: const char *path = getenv ("PATH");
226:
227: if (path != NULL)
228: {
229: const char *p;
230: const char *p_next;
231:
232: for (p = path; *p; p = p_next)
233: {
234: const char *q;
235: size_t p_len;
236: char *concat_name;
237:
238: for (q = p; *q; q++)
239: if (*q == ':')
240: break;
241: p_len = q - p;
242: p_next = (*q == '\0' ? q : q + 1);
243:
244: /* We have a path item at p, of length p_len.
245: Now concatenate the path item and argv0. */
246: concat_name = (char *) xmalloc (p_len + strlen (argv0) + 2);
247: #ifdef NO_XMALLOC
248: if (concat_name == NULL)
249: return NULL;
250: #endif
251: if (p_len == 0)
252: /* An empty PATH element designates the current directory. */
253: strcpy (concat_name, argv0);
254: else
255: {
256: memcpy (concat_name, p, p_len);
257: concat_name[p_len] = '/';
258: strcpy (concat_name + p_len + 1, argv0);
259: }
260: if (maybe_executable (concat_name))
261: return canonicalize_file_name (concat_name);
262: free (concat_name);
263: }
264: }
265: /* Not found in the PATH, assume the current directory. */
266: }
267: /* exec treats paths containing slashes as relative to the current
268: directory. */
269: if (maybe_executable (argv0))
270: return canonicalize_file_name (argv0);
271: }
272: /* No way to find the executable. */
273: return NULL;
274: #endif
275: }
276:
277: /* Full pathname of executable, or NULL. */
278: static char *executable_fullname;
279:
280: static void
281: prepare_relocate (const char *orig_installprefix, const char *orig_installdir,
282: const char *argv0)
283: {
284: char *curr_prefix;
285:
286: /* Determine the full pathname of the current executable. */
287: executable_fullname = find_executable (argv0);
288:
289: /* Determine the current installation prefix from it. */
290: curr_prefix = compute_curr_prefix (orig_installprefix, orig_installdir,
291: executable_fullname);
292: if (curr_prefix != NULL)
293: {
294: /* Now pass this prefix to all copies of the relocate.c source file. */
295: set_relocation_prefix (orig_installprefix, curr_prefix);
296:
297: free (curr_prefix);
298: }
299: }
300:
301: /* Set program_name, based on argv[0], and original installation prefix and
302: directory, for relocatability. */
303: void
304: set_program_name_and_installdir (const char *argv0,
305: const char *orig_installprefix,
306: const char *orig_installdir)
307: {
308: const char *argv0_stripped = argv0;
309:
310: /* Relocatable programs are renamed to .bin by install-reloc. Or, more
311: generally, their suffix is changed from $exeext to .bin$exeext.
312: Remove the ".bin" here. */
313: {
314: size_t argv0_len = strlen (argv0);
315: const size_t exeext_len = sizeof (EXEEXT) - sizeof ("");
316: if (argv0_len > 4 + exeext_len)
317: if (memcmp (argv0 + argv0_len - exeext_len - 4, ".bin", 4) == 0)
318: {
319: if (sizeof (EXEEXT) > sizeof (""))
320: {
321: /* Compare using an inlined copy of c_strncasecmp(), because
322: the filenames may have undergone a case conversion since
323: they were packaged. In other words, EXEEXT may be ".exe"
324: on one system and ".EXE" on another. */
325: static const char exeext[] = EXEEXT;
326: const char *s1 = argv0 + argv0_len - exeext_len;
327: const char *s2 = exeext;
328: for (; *s1 != '\0'; s1++, s2++)
329: {
330: unsigned char c1 = *s1;
331: unsigned char c2 = *s2;
332: if ((c1 >= 'A' && c1 <= 'Z' ? c1 - 'A' + 'a' : c1)
333: != (c2 >= 'A' && c2 <= 'Z' ? c2 - 'A' + 'a' : c2))
334: goto done_stripping;
335: }
336: }
337: /* Remove ".bin" before EXEEXT or its equivalent. */
338: {
339: char *shorter = (char *) xmalloc (argv0_len - 4 + 1);
340: #ifdef NO_XMALLOC
341: if (shorter != NULL)
342: #endif
343: {
344: memcpy (shorter, argv0, argv0_len - exeext_len - 4);
345: if (sizeof (EXEEXT) > sizeof (""))
346: memcpy (shorter + argv0_len - exeext_len - 4,
347: argv0 + argv0_len - exeext_len - 4,
348: exeext_len);
349: shorter[argv0_len - 4] = '\0';
350: argv0_stripped = shorter;
351: }
352: }
353: done_stripping: ;
354: }
355: }
356:
357: set_program_name (argv0_stripped);
358:
359: prepare_relocate (orig_installprefix, orig_installdir, argv0);
360: }
361:
362: /* Return the full pathname of the current executable, based on the earlier
363: call to set_program_name_and_installdir. Return NULL if unknown. */
364: char *
365: get_full_program_name (void)
366: {
367: return executable_fullname;
368: }
369:
370: #endif
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