1 /* Relocating wrapper program.
2 Copyright (C) 2003, 2005-2007 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 /* Dependencies:
19 relocwrapper
20 -> progname
21 -> progreloc
22 -> xreadlink
23 -> areadlink
24 -> readlink
25 -> canonicalize-lgpl
26 -> malloca
27 -> relocatable
28 -> setenv
29 -> malloca
30 -> strerror
31 -> c-ctype
32
33 Macros that need to be set while compiling this file:
34 - ENABLE_RELOCATABLE 1
35 - INSTALLPREFIX the base installation directory
36 - INSTALLDIR the directory into which this program is installed
37 - LIBPATHVAR the platform dependent runtime library path variable
38 - LIBDIRS a comma-terminated list of strings representing the list of
39 directories that contain the libraries at installation time
40
41 We don't want to internationalize this wrapper because then it would
42 depend on libintl and therefore need relocation itself. So use only
43 libc functions, no gettext(), no error(), no xmalloc(), no xsetenv().
44 */
45
46 #include <config.h>
47
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <unistd.h>
52 #include <errno.h>
53
54 #include "progname.h"
55 #include "relocatable.h"
56 #include "setenv.h"
57 #include "c-ctype.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 (c_tolower (c1) != c_tolower (c2))
87 goto simple_append;
88 }
89 /* Insert ".bin" before EXEEXT or its equivalent. */
90 memcpy (result, filename, filename_len - exeext_len);
91 memcpy (result + filename_len - exeext_len, ".bin", 4);
92 memcpy (result + filename_len - exeext_len + 4,
93 filename + filename_len - exeext_len,
94 exeext_len + 1);
95 return result;
96 }
97 }
98 simple_append:
99 /* Simply append ".bin". */
100 memcpy (result, filename, filename_len);
101 memcpy (result + filename_len, ".bin", 4 + 1);
102 return result;
103 }
104 else
105 {
106 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
107 exit (1);
108 }
109 }
110
111 /* List of directories that contain the libraries. */
112 static const char *libdirs[] = { LIBDIRS NULL };
113 /* Verify that at least one directory is given. */
114 typedef int verify1[2 * (sizeof (libdirs) / sizeof (libdirs[0]) > 1) - 1];
115
116 /* Relocate the list of directories that contain the libraries. */
117 static void
relocate_libdirs()118 relocate_libdirs ()
119 {
120 size_t i;
121
122 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
123 libdirs[i] = relocate (libdirs[i]);
124 }
125
126 /* Activate the list of directories in the LIBPATHVAR. */
127 static void
activate_libdirs()128 activate_libdirs ()
129 {
130 const char *old_value;
131 size_t total;
132 size_t i;
133 char *value;
134 char *p;
135
136 old_value = getenv (LIBPATHVAR);
137 if (old_value == NULL)
138 old_value = "";
139
140 total = 0;
141 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
142 total += strlen (libdirs[i]) + 1;
143 total += strlen (old_value) + 1;
144
145 value = (char *) malloc (total);
146 if (value == NULL)
147 {
148 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
149 exit (1);
150 }
151 p = value;
152 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
153 {
154 size_t len = strlen (libdirs[i]);
155 memcpy (p, libdirs[i], len);
156 p += len;
157 *p++ = ':';
158 }
159 if (old_value[0] != '\0')
160 strcpy (p, old_value);
161 else
162 p[-1] = '\0';
163
164 if (setenv (LIBPATHVAR, value, 1) < 0)
165 {
166 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
167 exit (1);
168 }
169 }
170
171 int
main(int argc,char * argv[])172 main (int argc, char *argv[])
173 {
174 char *full_program_name;
175
176 /* Set the program name and perform preparations for
177 get_full_program_name() and relocate(). */
178 set_program_name_and_installdir (argv[0], INSTALLPREFIX, INSTALLDIR);
179
180 /* Get the full program path. (Important if accessed through a symlink.) */
181 full_program_name = get_full_program_name ();
182 if (full_program_name == NULL)
183 full_program_name = argv[0];
184
185 /* Invoke the real program, with suffix ".bin". */
186 argv[0] = add_dotbin (full_program_name);
187 relocate_libdirs ();
188 activate_libdirs ();
189 execv (argv[0], argv);
190 fprintf (stderr, "%s: could not execute %s: %s\n",
191 program_name, argv[0], strerror (errno));
192 exit (127);
193 }
194