1: /* Provide relocatable packages.
2: Copyright (C) 2003-2006, 2008-2011 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: /* Tell glibc's <stdio.h> to provide a prototype for getline().
20: This must come before <config.h> because <config.h> may include
21: <features.h>, and once <features.h> has been included, it's too late. */
22: #ifndef _GNU_SOURCE
23: # define _GNU_SOURCE 1
24: #endif
25:
26: #define _GL_USE_STDLIB_ALLOC 1
27: #include <config.h>
28:
29: /* Specification. */
30: #include "relocatable.h"
31:
32: #if ENABLE_RELOCATABLE
33:
34: #include <stddef.h>
35: #include <stdio.h>
36: #include <stdlib.h>
37: #include <string.h>
38:
39: #ifdef NO_XMALLOC
40: # define xmalloc malloc
41: #else
42: # include "xalloc.h"
43: #endif
44:
45: #if (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__
46: # define WIN32_LEAN_AND_MEAN
47: # include <windows.h>
48: #endif
49:
50: #if DEPENDS_ON_LIBCHARSET
51: # include <libcharset.h>
52: #endif
53: #if DEPENDS_ON_LIBICONV && HAVE_ICONV
54: # include <iconv.h>
55: #endif
56: #if DEPENDS_ON_LIBINTL && ENABLE_NLS
57: # include <libintl.h>
58: #endif
59:
60: /* Faked cheap 'bool'. */
61: #undef bool
62: #undef false
63: #undef true
64: #define bool int
65: #define false 0
66: #define true 1
67:
68: /* Pathname support.
69: ISSLASH(C) tests whether C is a directory separator character.
70: IS_PATH_WITH_DIR(P) tests whether P contains a directory specification.
71: */
72: #if ((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__) || defined __EMX__ || defined __DJGPP__
73: /* Win32, OS/2, DOS */
74: # define ISSLASH(C) ((C) == '/' || (C) == '\\')
75: # define HAS_DEVICE(P) \
76: ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \
77: && (P)[1] == ':')
78: # define IS_PATH_WITH_DIR(P) \
79: (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P))
80: # define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0)
81: #else
82: /* Unix */
83: # define ISSLASH(C) ((C) == '/')
84: # define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL)
85: # define FILE_SYSTEM_PREFIX_LEN(P) 0
86: #endif
87:
88: /* Original installation prefix. */
89: static char *orig_prefix;
90: static size_t orig_prefix_len;
91: /* Current installation prefix. */
92: static char *curr_prefix;
93: static size_t curr_prefix_len;
94: /* These prefixes do not end in a slash. Anything that will be concatenated
95: to them must start with a slash. */
96:
97: /* Sets the original and the current installation prefix of this module.
98: Relocation simply replaces a pathname starting with the original prefix
99: by the corresponding pathname with the current prefix instead. Both
100: prefixes should be directory names without trailing slash (i.e. use ""
101: instead of "/"). */
102: static void
103: set_this_relocation_prefix (const char *orig_prefix_arg,
104: const char *curr_prefix_arg)
105: {
106: if (orig_prefix_arg != NULL && curr_prefix_arg != NULL
107: /* Optimization: if orig_prefix and curr_prefix are equal, the
108: relocation is a nop. */
109: && strcmp (orig_prefix_arg, curr_prefix_arg) != 0)
110: {
111: /* Duplicate the argument strings. */
112: char *memory;
113:
114: orig_prefix_len = strlen (orig_prefix_arg);
115: curr_prefix_len = strlen (curr_prefix_arg);
116: memory = (char *) xmalloc (orig_prefix_len + 1 + curr_prefix_len + 1);
117: #ifdef NO_XMALLOC
118: if (memory != NULL)
119: #endif
120: {
121: memcpy (memory, orig_prefix_arg, orig_prefix_len + 1);
122: orig_prefix = memory;
123: memory += orig_prefix_len + 1;
124: memcpy (memory, curr_prefix_arg, curr_prefix_len + 1);
125: curr_prefix = memory;
126: return;
127: }
128: }
129: orig_prefix = NULL;
130: curr_prefix = NULL;
131: /* Don't worry about wasted memory here - this function is usually only
132: called once. */
133: }
134:
135: /* Sets the original and the current installation prefix of the package.
136: Relocation simply replaces a pathname starting with the original prefix
137: by the corresponding pathname with the current prefix instead. Both
138: prefixes should be directory names without trailing slash (i.e. use ""
139: instead of "/"). */
140: void
141: set_relocation_prefix (const char *orig_prefix_arg, const char *curr_prefix_arg)
142: {
143: set_this_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
144:
145: /* Now notify all dependent libraries. */
146: #if DEPENDS_ON_LIBCHARSET
147: libcharset_set_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
148: #endif
149: #if DEPENDS_ON_LIBICONV && HAVE_ICONV && _LIBICONV_VERSION >= 0x0109
150: libiconv_set_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
151: #endif
152: #if DEPENDS_ON_LIBINTL && ENABLE_NLS && defined libintl_set_relocation_prefix
153: libintl_set_relocation_prefix (orig_prefix_arg, curr_prefix_arg);
154: #endif
155: }
156:
157: #if !defined IN_LIBRARY || (defined PIC && defined INSTALLDIR)
158:
159: /* Convenience function:
160: Computes the current installation prefix, based on the original
161: installation prefix, the original installation directory of a particular
162: file, and the current pathname of this file.
163: Returns it, freshly allocated. Returns NULL upon failure. */
164: #ifdef IN_LIBRARY
165: #define compute_curr_prefix local_compute_curr_prefix
166: static
167: #endif
168: char *
169: compute_curr_prefix (const char *orig_installprefix,
170: const char *orig_installdir,
171: const char *curr_pathname)
172: {
173: 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 file system 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 file system */
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: {
258: /* Unexpected: The curr_installdir does not end with rel_installdir. */
259: free (curr_installdir);
260: return NULL;
261: }
262:
263: {
264: size_t curr_prefix_len = cp - curr_installdir;
265: char *curr_prefix;
266:
267: curr_prefix = (char *) xmalloc (curr_prefix_len + 1);
268: #ifdef NO_XMALLOC
269: if (curr_prefix == NULL)
270: {
271: free (curr_installdir);
272: return NULL;
273: }
274: #endif
275: memcpy (curr_prefix, curr_installdir, curr_prefix_len);
276: curr_prefix[curr_prefix_len] = '\0';
277:
278: free (curr_installdir);
279:
280: return curr_prefix;
281: }
282: }
283: }
284:
285: #endif /* !IN_LIBRARY || PIC */
286:
287: #if defined PIC && defined INSTALLDIR
288:
289: /* Full pathname of shared library, or NULL. */
290: static char *shared_library_fullname;
291:
292: #if (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__
293: /* Native Win32 only.
294: On Cygwin, it is better to use the Cygwin provided /proc interface, than
295: to use native Win32 API and cygwin_conv_to_posix_path, because it supports
296: longer file names
297: (see <http://cygwin.com/ml/cygwin/2011-01/msg00410.html>). */
298:
299: /* Determine the full pathname of the shared library when it is loaded. */
300:
301: BOOL WINAPI
302: DllMain (HINSTANCE module_handle, DWORD event, LPVOID reserved)
303: {
304: (void) reserved;
305:
306: if (event == DLL_PROCESS_ATTACH)
307: {
308: /* The DLL is being loaded into an application's address range. */
309: static char location[MAX_PATH];
310:
311: if (!GetModuleFileName (module_handle, location, sizeof (location)))
312: /* Shouldn't happen. */
313: return FALSE;
314:
315: if (!IS_PATH_WITH_DIR (location))
316: /* Shouldn't happen. */
317: return FALSE;
318:
319: shared_library_fullname = strdup (location);
320: }
321:
322: return TRUE;
323: }
324:
325: #else /* Unix */
326:
327: static void
328: find_shared_library_fullname ()
329: {
330: #if (defined __linux__ && (__GLIBC__ >= 2 || defined __UCLIBC__)) || defined __CYGWIN__
331: /* Linux has /proc/self/maps. glibc 2 and uClibc have the getline()
332: function.
333: Cygwin >= 1.5 has /proc/self/maps and the getline() function too. */
334: FILE *fp;
335:
336: /* Open the current process' maps file. It describes one VMA per line. */
337: fp = fopen ("/proc/self/maps", "r");
338: if (fp)
339: {
340: unsigned long address = (unsigned long) &find_shared_library_fullname;
341: for (;;)
342: {
343: unsigned long start, end;
344: int c;
345:
346: if (fscanf (fp, "%lx-%lx", &start, &end) != 2)
347: break;
348: if (address >= start && address <= end - 1)
349: {
350: /* Found it. Now see if this line contains a filename. */
351: while (c = getc (fp), c != EOF && c != '\n' && c != '/')
352: continue;
353: if (c == '/')
354: {
355: size_t size;
356: int len;
357:
358: ungetc (c, fp);
359: shared_library_fullname = NULL; size = 0;
360: len = getline (&shared_library_fullname, &size, fp);
361: if (len >= 0)
362: {
363: /* Success: filled shared_library_fullname. */
364: if (len > 0 && shared_library_fullname[len - 1] == '\n')
365: shared_library_fullname[len - 1] = '\0';
366: }
367: }
368: break;
369: }
370: while (c = getc (fp), c != EOF && c != '\n')
371: continue;
372: }
373: fclose (fp);
374: }
375: #endif
376: }
377:
378: #endif /* WIN32 / Unix */
379:
380: /* Return the full pathname of the current shared library.
381: Return NULL if unknown.
382: Guaranteed to work only on Linux, Cygwin and Woe32. */
383: static char *
384: get_shared_library_fullname ()
385: {
386: #if !((defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__)
387: static bool tried_find_shared_library_fullname;
388: if (!tried_find_shared_library_fullname)
389: {
390: find_shared_library_fullname ();
391: tried_find_shared_library_fullname = true;
392: }
393: #endif
394: return shared_library_fullname;
395: }
396:
397: #endif /* PIC */
398:
399: /* Returns the pathname, relocated according to the current installation
400: directory.
401: The returned string is either PATHNAME unmodified or a freshly allocated
402: string that you can free with free() after casting it to 'char *'. */
403: const char *
404: relocate (const char *pathname)
405: {
406: #if defined PIC && defined INSTALLDIR
407: static int initialized;
408:
409: /* Initialization code for a shared library. */
410: if (!initialized)
411: {
412: /* At this point, orig_prefix and curr_prefix likely have already been
413: set through the main program's set_program_name_and_installdir
414: function. This is sufficient in the case that the library has
415: initially been installed in the same orig_prefix. But we can do
416: better, to also cover the cases that 1. it has been installed
417: in a different prefix before being moved to orig_prefix and (later)
418: to curr_prefix, 2. unlike the program, it has not moved away from
419: orig_prefix. */
420: const char *orig_installprefix = INSTALLPREFIX;
421: const char *orig_installdir = INSTALLDIR;
422: char *curr_prefix_better;
423:
424: curr_prefix_better =
425: compute_curr_prefix (orig_installprefix, orig_installdir,
426: get_shared_library_fullname ());
427:
428: set_relocation_prefix (orig_installprefix,
429: curr_prefix_better != NULL
430: ? curr_prefix_better
431: : curr_prefix);
432:
433: if (curr_prefix_better != NULL)
434: free (curr_prefix_better);
435:
436: initialized = 1;
437: }
438: #endif
439:
440: /* Note: It is not necessary to perform case insensitive comparison here,
441: even for DOS-like file systems, because the pathname argument was
442: typically created from the same Makefile variable as orig_prefix came
443: from. */
444: if (orig_prefix != NULL && curr_prefix != NULL
445: && strncmp (pathname, orig_prefix, orig_prefix_len) == 0)
446: {
447: if (pathname[orig_prefix_len] == '\0')
448: {
449: /* pathname equals orig_prefix. */
450: char *result = (char *) xmalloc (strlen (curr_prefix) + 1);
451:
452: #ifdef NO_XMALLOC
453: if (result != NULL)
454: #endif
455: {
456: strcpy (result, curr_prefix);
457: return result;
458: }
459: }
460: else if (ISSLASH (pathname[orig_prefix_len]))
461: {
462: /* pathname starts with orig_prefix. */
463: const char *pathname_tail = &pathname[orig_prefix_len];
464: char *result =
465: (char *) xmalloc (curr_prefix_len + strlen (pathname_tail) + 1);
466:
467: #ifdef NO_XMALLOC
468: if (result != NULL)
469: #endif
470: {
471: memcpy (result, curr_prefix, curr_prefix_len);
472: strcpy (result + curr_prefix_len, pathname_tail);
473: return result;
474: }
475: }
476: }
477: /* Nothing to relocate. */
478: return pathname;
479: }
480:
481: #endif
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