1 /* Relocating wrapper program.
2 Copyright (C) 2003, 2005-2006 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
6 it under the terms of the GNU General Public License as published by
7 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
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, write to the Free Software Foundation,
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18
19 /* Dependencies:
20 relocwrapper
21 -> progname
22 -> progreloc
23 -> xreadlink
24 -> readlink
25 -> canonicalize
26 -> allocsa
27 -> relocatable
28 -> setenv
29 -> allocsa
30 -> strerror
31
32 Macros that need to be set while compiling this file:
33 - ENABLE_RELOCATABLE 1
34 - INSTALLPREFIX the base installation directory
35 - INSTALLDIR the directory into which this program is installed
36 - LIBPATHVAR the platform dependent runtime library path variable
37 - LIBDIRS a comma-terminated list of strings representing the list of
38 directories that contain the libraries at installation time
39
40 We don't want to internationalize this wrapper because then it would
41 depend on libintl and therefore need relocation itself. So use only
42 libc functions, no gettext(), no error(), no xmalloc(), no xsetenv().
43 */
44
45 #include <config.h>
46
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50 #if HAVE_UNISTD_H
51 # include <unistd.h>
52 #endif
53 #include <errno.h>
54
55 #include "progname.h"
56 #include "relocatable.h"
57 #include "setenv.h"
58
59 /* Return a copy of the filename, with an extra ".bin" at the end.
60 More generally, it replaces "${EXEEXT}" at the end with ".bin${EXEEXT}". */
61 static char *
add_dotbin(const char * filename)62 add_dotbin (const char *filename)
63 {
64 size_t filename_len = strlen (filename);
65 char *result = (char *) malloc (filename_len + 4 + 1);
66
67 if (result != NULL)
68 {
69 if (sizeof (EXEEXT) > sizeof (""))
70 {
71 /* EXEEXT handling. */
72 const size_t exeext_len = sizeof (EXEEXT) - sizeof ("");
73 static const char exeext[] = EXEEXT;
74 if (filename_len > exeext_len)
75 {
76 /* Compare using an inlined copy of c_strncasecmp(), because
77 the filenames may have undergone a case conversion since
78 they were packaged. In other words, EXEEXT may be ".exe"
79 on one system and ".EXE" on another. */
80 const char *s1 = filename + filename_len - exeext_len;
81 const char *s2 = exeext;
82 for (; *s1 != '\0'; s1++, s2++)
83 {
84 unsigned char c1 = *s1;
85 unsigned char c2 = *s2;
86 if ((c1 >= 'A' && c1 <= 'Z' ? c1 - 'A' + 'a' : c1)
87 != (c2 >= 'A' && c2 <= 'Z' ? c2 - 'A' + 'a' : c2))
88 goto simple_append;
89 }
90 /* Insert ".bin" before EXEEXT or its equivalent. */
91 memcpy (result, filename, filename_len - exeext_len);
92 memcpy (result + filename_len - exeext_len, ".bin", 4);
93 memcpy (result + filename_len - exeext_len + 4,
94 filename + filename_len - exeext_len,
95 exeext_len + 1);
96 return result;
97 }
98 }
99 simple_append:
100 /* Simply append ".bin". */
101 memcpy (result, filename, filename_len);
102 memcpy (result + filename_len, ".bin", 4 + 1);
103 return result;
104 }
105 else
106 {
107 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
108 exit (1);
109 }
110 }
111
112 /* List of directories that contain the libraries. */
113 static const char *libdirs[] = { LIBDIRS NULL };
114 /* Verify that at least one directory is given. */
115 typedef int verify1[2 * (sizeof (libdirs) / sizeof (libdirs[0]) > 1) - 1];
116
117 /* Relocate the list of directories that contain the libraries. */
118 static void
relocate_libdirs()119 relocate_libdirs ()
120 {
121 size_t i;
122
123 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
124 libdirs[i] = relocate (libdirs[i]);
125 }
126
127 /* Activate the list of directories in the LIBPATHVAR. */
128 static void
activate_libdirs()129 activate_libdirs ()
130 {
131 const char *old_value;
132 size_t total;
133 size_t i;
134 char *value;
135 char *p;
136
137 old_value = getenv (LIBPATHVAR);
138 if (old_value == NULL)
139 old_value = "";
140
141 total = 0;
142 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
143 total += strlen (libdirs[i]) + 1;
144 total += strlen (old_value) + 1;
145
146 value = (char *) malloc (total);
147 if (value == NULL)
148 {
149 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
150 exit (1);
151 }
152 p = value;
153 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
154 {
155 size_t len = strlen (libdirs[i]);
156 memcpy (p, libdirs[i], len);
157 p += len;
158 *p++ = ':';
159 }
160 if (old_value[0] != '\0')
161 strcpy (p, old_value);
162 else
163 p[-1] = '\0';
164
165 if (setenv (LIBPATHVAR, value, 1) < 0)
166 {
167 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
168 exit (1);
169 }
170 }
171
172 int
main(int argc,char * argv[])173 main (int argc, char *argv[])
174 {
175 char *full_program_name;
176
177 /* Set the program name and perform preparations for
178 get_full_program_name() and relocate(). */
179 set_program_name_and_installdir (argv[0], INSTALLPREFIX, INSTALLDIR);
180
181 /* Get the full program path. (Important if accessed through a symlink.) */
182 full_program_name = get_full_program_name ();
183 if (full_program_name == NULL)
184 full_program_name = argv[0];
185
186 /* Invoke the real program, with suffix ".bin". */
187 argv[0] = add_dotbin (full_program_name);
188 relocate_libdirs ();
189 activate_libdirs ();
190 execv (argv[0], argv);
191 fprintf (stderr, "%s: could not execute %s: %s\n",
192 program_name, argv[0], strerror (errno));
193 exit (127);
194 }
195