1 /* Relocating wrapper program.
2 Copyright (C) 2003, 2005-2007, 2009-2019 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 <https://www.gnu.org/licenses/>. */
17
18 /* Dependencies:
19 relocwrapper
20 -> progname
21 -> progreloc
22 -> areadlink
23 -> careadlinkat
24 -> allocator
25 -> readlink
26 -> stat
27 -> dosname
28 -> pathmax
29 -> verify
30 -> canonicalize-lgpl
31 -> malloca
32 -> lstat
33 -> readlink
34 -> relocatable
35 -> setenv
36 -> malloca
37 -> fprintf-posix [ignore, cut dependency tree here]
38 -> strerror [ignore, cut dependency tree here]
39 -> c-ctype
40
41 Macros that need to be set while compiling this file:
42 - ENABLE_RELOCATABLE 1
43 - INSTALLPREFIX the base installation directory
44 - INSTALLDIR the directory into which this program is installed
45 - LIBPATHVAR the platform dependent runtime library path variable
46 - LIBDIRS a comma-terminated list of strings representing the list of
47 directories that contain the libraries at installation time
48
49 We don't want to internationalize this wrapper because then it would
50 depend on libintl and therefore need relocation itself. So use only
51 libc functions, no gettext(), no error(), no xmalloc(), no xsetenv().
52 */
53
54 #define _GL_USE_STDLIB_ALLOC 1
55 #include <config.h>
56
57 #include <stdio.h>
58 #include <stdlib.h>
59 #include <string.h>
60 #include <unistd.h>
61 #include <errno.h>
62
63 #include "progname.h"
64 #include "relocatable.h"
65 #include "c-ctype.h"
66 #include "verify.h"
67
68 /* Use the system functions, not the gnulib overrides in this file. */
69 #undef fprintf
70 #undef strerror
71
72 /* Return a copy of the filename, with an extra ".bin" at the end.
73 More generally, it replaces "${EXEEXT}" at the end with ".bin${EXEEXT}". */
74 static char *
add_dotbin(const char * filename)75 add_dotbin (const char *filename)
76 {
77 size_t filename_len = strlen (filename);
78 char *result = (char *) malloc (filename_len + 4 + 1);
79
80 if (result != NULL)
81 {
82 if (sizeof (EXEEXT) > sizeof (""))
83 {
84 /* EXEEXT handling. */
85 const size_t exeext_len = sizeof (EXEEXT) - sizeof ("");
86 static const char exeext[] = EXEEXT;
87 if (filename_len > exeext_len)
88 {
89 /* Compare using an inlined copy of c_strncasecmp(), because
90 the filenames may have undergone a case conversion since
91 they were packaged. In other words, EXEEXT may be ".exe"
92 on one system and ".EXE" on another. */
93 const char *s1 = filename + filename_len - exeext_len;
94 const char *s2 = exeext;
95 for (; *s1 != '\0'; s1++, s2++)
96 {
97 unsigned char c1 = *s1;
98 unsigned char c2 = *s2;
99 if (c_tolower (c1) != c_tolower (c2))
100 goto simple_append;
101 }
102 /* Insert ".bin" before EXEEXT or its equivalent. */
103 memcpy (result, filename, filename_len - exeext_len);
104 memcpy (result + filename_len - exeext_len, ".bin", 4);
105 memcpy (result + filename_len - exeext_len + 4,
106 filename + filename_len - exeext_len,
107 exeext_len + 1);
108 return result;
109 }
110 }
111 simple_append:
112 /* Simply append ".bin". */
113 memcpy (result, filename, filename_len);
114 memcpy (result + filename_len, ".bin", 4 + 1);
115 return result;
116 }
117 else
118 {
119 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
120 exit (1);
121 }
122 }
123
124 /* List of directories that contain the libraries. */
125 static const char *libdirs[] = { LIBDIRS NULL };
126 /* Verify that at least one directory is given. */
127 verify (sizeof (libdirs) / sizeof (libdirs[0]) > 1);
128
129 /* Relocate the list of directories that contain the libraries. */
130 static void
relocate_libdirs()131 relocate_libdirs ()
132 {
133 size_t i;
134
135 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
136 libdirs[i] = relocate (libdirs[i]);
137 }
138
139 /* Activate the list of directories in the LIBPATHVAR. */
140 static void
activate_libdirs()141 activate_libdirs ()
142 {
143 const char *old_value;
144 size_t total;
145 size_t i;
146 char *value;
147 char *p;
148
149 old_value = getenv (LIBPATHVAR);
150 if (old_value == NULL)
151 old_value = "";
152
153 total = 0;
154 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
155 total += strlen (libdirs[i]) + 1;
156 total += strlen (old_value) + 1;
157
158 value = (char *) malloc (total);
159 if (value == NULL)
160 {
161 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
162 exit (1);
163 }
164 p = value;
165 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++)
166 {
167 size_t len = strlen (libdirs[i]);
168 memcpy (p, libdirs[i], len);
169 p += len;
170 *p++ = ':';
171 }
172 if (old_value[0] != '\0')
173 strcpy (p, old_value);
174 else
175 p[-1] = '\0';
176
177 if (setenv (LIBPATHVAR, value, 1) < 0)
178 {
179 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted");
180 exit (1);
181 }
182 }
183
184 int
main(int argc,char * argv[])185 main (int argc, char *argv[])
186 {
187 char *full_program_name;
188
189 /* Set the program name and perform preparations for
190 get_full_program_name() and relocate(). */
191 set_program_name_and_installdir (argv[0], INSTALLPREFIX, INSTALLDIR);
192
193 /* Get the full program path. (Important if accessed through a symlink.) */
194 full_program_name = get_full_program_name ();
195 if (full_program_name == NULL)
196 full_program_name = argv[0];
197
198 /* Invoke the real program, with suffix ".bin". */
199 argv[0] = add_dotbin (full_program_name);
200 relocate_libdirs ();
201 activate_libdirs ();
202 execv (argv[0], argv);
203 fprintf (stderr, "%s: could not execute %s: %s\n",
204 program_name, argv[0], strerror (errno));
205 exit (127);
206 }
207