1: /* Provide relocatable packages.
2: Copyright (C) 2003-2006 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 it
6: under the terms of the GNU Library General Public License as published
7: by the Free Software Foundation; either version 2, or (at your option)
8: 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 GNU
13: Library General Public License for more details.
14:
15: You should have received a copy of the GNU Library General Public
16: License along with this program; if not, write to the Free Software
17: Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
18: USA. */
19:
20:
21: /* Tell glibc's <stdio.h> to provide a prototype for getline().
22: This must come before <config.h> because <config.h> may include
23: <features.h>, and once <features.h> has been included, it's too late. */
24: #ifndef _GNU_SOURCE
25: # define _GNU_SOURCE 1
26: #endif
27:
28: #include <config.h>
29:
30: /* Specification. */
31: #include "relocatable.h"
32:
33: #if ENABLE_RELOCATABLE
34:
35: #include <stddef.h>
36: #include <stdio.h>
37: #include <stdlib.h>
38: #include <string.h>
39:
40: #ifdef NO_XMALLOC
41: # define xmalloc malloc
42: #else
43: # include "xalloc.h"
44: #endif
45:
46: #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__
47: # define WIN32_LEAN_AND_MEAN
48: # include <windows.h>
49: #endif
50:
51: #if DEPENDS_ON_LIBCHARSET
52: # include <libcharset.h>
53: #endif
54: #if DEPENDS_ON_LIBICONV && HAVE_ICONV
55: # include <iconv.h>
56: #endif
57: #if DEPENDS_ON_LIBINTL && ENABLE_NLS
58: # include <libintl.h>
59: #endif
60:
61: /* Faked cheap 'bool'. */
62: #undef bool
63: #undef false
64: #undef true
65: #define bool int
66: #define false 0
67: #define true 1
68:
69: /* Pathname support.
70: ISSLASH(C) tests whether C is a directory separator character.
71: IS_PATH_WITH_DIR(P) tests whether P contains a directory specification.
72: */
73: #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__
74: /* Win32, Cygwin, OS/2, DOS */
75: # define ISSLASH(C) ((C) == '/' || (C) == '\\')
76: # define HAS_DEVICE(P) \
77: ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \
78: && (P)[1] == ':')
79: # define IS_PATH_WITH_DIR(P) \
80: (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P))
81: # define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
82: #else
83: /* Unix */
84: # define ISSLASH(C) ((C) == '/')
85: # define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL)
86: # define FILE_SYSTEM_PREFIX_LEN(P) 0
87: #endif
88:
89: /* Original installation prefix. */
90: static char *orig_prefix;
91: static size_t orig_prefix_len;
92: /* Current installation prefix. */
93: static char *curr_prefix;
94: static size_t curr_prefix_len;
95: /* These prefixes do not end in a slash. Anything that will be concatenated
96: to them must start with a slash. */
97:
98: /* Sets the original and the current installation prefix of this module.
99: Relocation simply replaces a pathname starting with the original prefix
100: by the corresponding pathname with the current prefix instead. Both
101: prefixes should be directory names without trailing slash (i.e. use ""
102: instead of "/"). */
103: static void
104: set_this_relocation_prefix (const char *orig_prefix_arg,
105: const char *curr_prefix_arg)
106: {
107: if (orig_prefix_arg != NULL && curr_prefix_arg != NULL
108: /* Optimization: if orig_prefix and curr_prefix are equal, the
109: relocation is a nop. */
110: && strcmp (orig_prefix_arg, curr_prefix_arg) != 0)
111: {
112: /* Duplicate the argument strings. */
113: char *memory;
114:
115: orig_prefix_len = strlen (orig_prefix_arg);
116: curr_prefix_len = strlen (curr_prefix_arg);
117: memory = (char *) xmalloc (orig_prefix_len + 1 + curr_prefix_len + 1);
118: #ifdef NO_XMALLOC
119: if (memory != NULL)
120: #endif
121: {
122: memcpy (memory, orig_prefix_arg, orig_prefix_len + 1);
123: orig_prefix = memory;
124: memory += orig_prefix_len + 1;
125: memcpy (memory, curr_prefix_arg, curr_prefix_len + 1);
126: curr_prefix = memory;
127: return;
128: }
129: }
130: orig_prefix = NULL;
131: curr_prefix = NULL;
132: /* Don't worry about wasted memory here - this function is usually only
133: called once. */
134: }
135:
136: /* Sets the original and the current installation prefix of the package.
137: Relocation simply replaces a pathname starting with the original prefix
138: by the corresponding pathname with the current prefix instead. Both
139: prefixes should be directory names without trailing slash (i.e. use ""
140: instead of "/"). */
141: void
142: set_relocation_prefix (const char *orig_prefix_arg, const char *curr_prefix_arg)
143: {
144: set_this_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
145:
146: /* Now notify all dependent libraries. */
147: #if DEPENDS_ON_LIBCHARSET
148: libcharset_set_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
149: #endif
150: #if DEPENDS_ON_LIBICONV && HAVE_ICONV && _LIBICONV_VERSION >= 0x0109
151: libiconv_set_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
152: #endif
153: #if DEPENDS_ON_LIBINTL && ENABLE_NLS && defined libintl_set_relocation_prefix
154: libintl_set_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
155: #endif
156: }
157:
158: #if !defined IN_LIBRARY || (defined PIC && defined INSTALLDIR)
159:
160: /* Convenience function:
161: Computes the current installation prefix, based on the original
162: installation prefix, the original installation directory of a particular
163: file, and the current pathname of this file. Returns NULL upon failure. */
164: #ifdef IN_LIBRARY
165: #define compute_curr_prefix local_compute_curr_prefix
166: static
167: #endif
168: const char *
169: compute_curr_prefix (const char *orig_installprefix,
170: const char *orig_installdir,
171: const char *curr_pathname)
172: {
173: const char *curr_installdir;
174: const char *rel_installdir;
175:
176: if (curr_pathname == NULL)
177: return NULL;
178:
179: /* Determine the relative installation directory, relative to the prefix.
180: This is simply the difference between orig_installprefix and
181: orig_installdir. */
182: if (strncmp (orig_installprefix, orig_installdir, strlen (orig_installprefix))
183: != 0)
184: /* Shouldn't happen - nothing should be installed outside $(prefix). */
185: return NULL;
186: rel_installdir = orig_installdir + strlen (orig_installprefix);
187:
188: /* Determine the current installation directory. */
189: {
190: const char *p_base = curr_pathname + FILE_SYSTEM_PREFIX_LEN (curr_pathname);
191: const char *p = curr_pathname + strlen (curr_pathname);
192: char *q;
193:
194: while (p > p_base)
195: {
196: p--;
197: if (ISSLASH (*p))
198: break;
199: }
200:
201: q = (char *) xmalloc (p - curr_pathname + 1);
202: #ifdef NO_XMALLOC
203: if (q == NULL)
204: return NULL;
205: #endif
206: memcpy (q, curr_pathname, p - curr_pathname);
207: q[p - curr_pathname] = '\0';
208: curr_installdir = q;
209: }
210:
211: /* Compute the current installation prefix by removing the trailing
212: rel_installdir from it. */
213: {
214: const char *rp = rel_installdir + strlen (rel_installdir);
215: const char *cp = curr_installdir + strlen (curr_installdir);
216: const char *cp_base =
217: curr_installdir + FILE_SYSTEM_PREFIX_LEN (curr_installdir);
218:
219: while (rp > rel_installdir && cp > cp_base)
220: {
221: bool same = false;
222: const char *rpi = rp;
223: const char *cpi = cp;
224:
225: while (rpi > rel_installdir && cpi > cp_base)
226: {
227: rpi--;
228: cpi--;
229: if (ISSLASH (*rpi) || ISSLASH (*cpi))
230: {
231: if (ISSLASH (*rpi) && ISSLASH (*cpi))
232: same = true;
233: break;
234: }
235: /* Do case-insensitive comparison if the filesystem is always or
236: often case-insensitive. It's better to accept the comparison
237: if the difference is only in case, rather than to fail. */
238: #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__
239: /* Win32, Cygwin, OS/2, DOS - case insignificant filesystem */
240: if ((*rpi >= 'a' && *rpi <= 'z' ? *rpi - 'a' + 'A' : *rpi)
241: != (*cpi >= 'a' && *cpi <= 'z' ? *cpi - 'a' + 'A' : *cpi))
242: break;
243: #else
244: if (*rpi != *cpi)
245: break;
246: #endif
247: }
248: if (!same)
249: break;
250: /* The last pathname component was the same. opi and cpi now point
251: to the slash before it. */
252: rp = rpi;
253: cp = cpi;
254: }
255:
256: if (rp > rel_installdir)
257: /* Unexpected: The curr_installdir does not end with rel_installdir. */
258: return NULL;
259:
260: {
261: size_t curr_prefix_len = cp - curr_installdir;
262: char *curr_prefix;
263:
264: curr_prefix = (char *) xmalloc (curr_prefix_len + 1);
265: #ifdef NO_XMALLOC
266: if (curr_prefix == NULL)
267: return NULL;
268: #endif
269: memcpy (curr_prefix, curr_installdir, curr_prefix_len);
270: curr_prefix[curr_prefix_len] = '\0';
271:
272: return curr_prefix;
273: }
274: }
275: }
276:
277: #endif /* !IN_LIBRARY || PIC */
278:
279: #if defined PIC && defined INSTALLDIR
280:
281: /* Full pathname of shared library, or NULL. */
282: static char *shared_library_fullname;
283:
284: #if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__
285:
286: /* Determine the full pathname of the shared library when it is loaded. */
287:
288: BOOL WINAPI
289: DllMain (HINSTANCE module_handle, DWORD event, LPVOID reserved)
290: {
291: (void) reserved;
292:
293: if (event == DLL_PROCESS_ATTACH)
294: {
295: /* The DLL is being loaded into an application's address range. */
296: static char location[MAX_PATH];
297:
298: if (!GetModuleFileName (module_handle, location, sizeof (location)))
299: /* Shouldn't happen. */
300: return FALSE;
301:
302: if (!IS_PATH_WITH_DIR (location))
303: /* Shouldn't happen. */
304: return FALSE;
305:
306: {
307: #if defined __CYGWIN__
308: /* On Cygwin, we need to convert paths coming from Win32 system calls
309: to the Unix-like slashified notation. */
310: static char location_as_posix_path[2 * MAX_PATH];
311: /* There's no error return defined for cygwin_conv_to_posix_path.
312: See cygwin-api/func-cygwin-conv-to-posix-path.html.
313: Does it overflow the buffer of expected size MAX_PATH or does it
314: truncate the path? I don't know. Let's catch both. */
315: cygwin_conv_to_posix_path (location, location_as_posix_path);
316: location_as_posix_path[MAX_PATH - 1] = '\0';
317: if (strlen (location_as_posix_path) >= MAX_PATH - 1)
318: /* A sign of buffer overflow or path truncation. */
319: return FALSE;
320: shared_library_fullname = strdup (location_as_posix_path);
321: #else
322: shared_library_fullname = strdup (location);
323: #endif
324: }
325: }
326:
327: return TRUE;
328: }
329:
330: #else /* Unix except Cygwin */
331:
332: static void
333: find_shared_library_fullname ()
334: {
335: #if defined __linux__ && __GLIBC__ >= 2
336: /* Linux has /proc/self/maps. glibc 2 has the getline() function. */
337: FILE *fp;
338:
339: /* Open the current process' maps file. It describes one VMA per line. */
340: fp = fopen ("/proc/self/maps", "r");
341: if (fp)
342: {
343: unsigned long address = (unsigned long) &find_shared_library_fullname;
344: for (;;)
345: {
346: unsigned long start, end;
347: int c;
348:
349: if (fscanf (fp, "%lx-%lx", &start, &end) != 2)
350: break;
351: if (address >= start && address <= end - 1)
352: {
353: /* Found it. Now see if this line contains a filename. */
354: while (c = getc (fp), c != EOF && c != '\n' && c != '/')
355: continue;
356: if (c == '/')
357: {
358: size_t size;
359: int len;
360:
361: ungetc (c, fp);
362: shared_library_fullname = NULL; size = 0;
363: len = getline (&shared_library_fullname, &size, fp);
364: if (len >= 0)
365: {
366: /* Success: filled shared_library_fullname. */
367: if (len > 0 && shared_library_fullname[len - 1] == '\n')
368: shared_library_fullname[len - 1] = '\0';
369: }
370: }
371: break;
372: }
373: while (c = getc (fp), c != EOF && c != '\n')
374: continue;
375: }
376: fclose (fp);
377: }
378: #endif
379: }
380:
381: #endif /* (WIN32 or Cygwin) / (Unix except Cygwin) */
382:
383: /* Return the full pathname of the current shared library.
384: Return NULL if unknown.
385: Guaranteed to work only on Linux, Cygwin and Woe32. */
386: static char *
387: get_shared_library_fullname ()
388: {
389: #if !(defined _WIN32 || defined __WIN32__ || defined __CYGWIN__)
390: static bool tried_find_shared_library_fullname;
391: if (!tried_find_shared_library_fullname)
392: {
393: find_shared_library_fullname ();
394: tried_find_shared_library_fullname = true;
395: }
396: #endif
397: return shared_library_fullname;
398: }
399:
400: #endif /* PIC */
401:
402: /* Returns the pathname, relocated according to the current installation
403: directory. */
404: const char *
405: relocate (const char *pathname)
406: {
407: #if defined PIC && defined INSTALLDIR
408: static int initialized;
409:
410: /* Initialization code for a shared library. */
411: if (!initialized)
412: {
413: /* At this point, orig_prefix and curr_prefix likely have already been
414: set through the main program's set_program_name_and_installdir
415: function. This is sufficient in the case that the library has
416: initially been installed in the same orig_prefix. But we can do
417: better, to also cover the cases that 1. it has been installed
418: in a different prefix before being moved to orig_prefix and (later)
419: to curr_prefix, 2. unlike the program, it has not moved away from
420: orig_prefix. */
421: const char *orig_installprefix = INSTALLPREFIX;
422: const char *orig_installdir = INSTALLDIR;
423: const char *curr_prefix_better;
424:
425: curr_prefix_better =
426: compute_curr_prefix (orig_installprefix, orig_installdir,
427: get_shared_library_fullname ());
428: if (curr_prefix_better == NULL)
429: curr_prefix_better = curr_prefix;
430:
431: set_relocation_prefix (orig_installprefix, curr_prefix_better);
432:
433: initialized = 1;
434: }
435: #endif
436:
437: /* Note: It is not necessary to perform case insensitive comparison here,
438: even for DOS-like filesystems, because the pathname argument was
439: typically created from the same Makefile variable as orig_prefix came
440: from. */
441: if (orig_prefix != NULL && curr_prefix != NULL
442: && strncmp (pathname, orig_prefix, orig_prefix_len) == 0)
443: {
444: if (pathname[orig_prefix_len] == '\0')
445: /* pathname equals orig_prefix. */
446: return curr_prefix;
447: if (ISSLASH (pathname[orig_prefix_len]))
448: {
449: /* pathname starts with orig_prefix. */
450: const char *pathname_tail = &pathname[orig_prefix_len];
451: char *result =
452: (char *) xmalloc (curr_prefix_len + strlen (pathname_tail) + 1);
453:
454: #ifdef NO_XMALLOC
455: if (result != NULL)
456: #endif
457: {
458: memcpy (result, curr_prefix, curr_prefix_len);
459: strcpy (result + curr_prefix_len, pathname_tail);
460: return result;
461: }
462: }
463: }
464: /* Nothing to relocate. */
465: return pathname;
466: }
467:
468: #endif
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