1/* Relocating wrapper program. 2 Copyright (C) 2003, 2005 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#ifdef HAVE_CONFIG_H 46# include <config.h> 47#endif 48 49#include <stdio.h> 50#include <stdlib.h> 51#include <string.h> 52#if HAVE_UNISTD_H 53# include <unistd.h> 54#endif 55#include <errno.h> 56 57#include "progname.h" 58#include "relocatable.h" 59#include "setenv.h" 60 61/* Return a copy of the filename, with an extra ".bin" at the end. 62 More generally, it replaces "${EXEEXT}" at the end with ".bin${EXEEXT}". */ 63static char * 64add_dotbin (const char *filename) 65{ 66 size_t filename_len = strlen (filename); 67 char *result = (char *) malloc (filename_len + 4 + 1); 68 69 if (result != NULL) 70 { 71 if (sizeof (EXEEXT) > sizeof ("")) 72 { 73 /* EXEEXT handling. */ 74 const size_t exeext_len = sizeof (EXEEXT) - sizeof (""); 75 static const char exeext[] = EXEEXT; 76 if (filename_len > exeext_len) 77 { 78 /* Compare using an inlined copy of c_strncasecmp(), because 79 the filenames may have undergone a case conversion since 80 they were packaged. In other words, EXEEXT may be ".exe" 81 on one system and ".EXE" on another. */ 82 const char *s1 = filename + filename_len - exeext_len; 83 const char *s2 = exeext; 84 for (; *s1 != '\0'; s1++, s2++) 85 { 86 unsigned char c1 = *s1; 87 unsigned char c2 = *s2; 88 if ((c1 >= 'A' && c1 <= 'Z' ? c1 - 'A' + 'a' : c1) 89 != (c2 >= 'A' && c2 <= 'Z' ? c2 - 'A' + 'a' : c2)) 90 goto simple_append; 91 } 92 /* Insert ".bin" before EXEEXT or its equivalent. */ 93 memcpy (result, filename, filename_len - exeext_len); 94 memcpy (result + filename_len - exeext_len, ".bin", 4); 95 memcpy (result + filename_len - exeext_len + 4, 96 filename + filename_len - exeext_len, 97 exeext_len + 1); 98 return result; 99 } 100 } 101 simple_append: 102 /* Simply append ".bin". */ 103 memcpy (result, filename, filename_len); 104 memcpy (result + filename_len, ".bin", 4 + 1); 105 return result; 106 } 107 else 108 { 109 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted"); 110 exit (1); 111 } 112} 113 114/* List of directories that contain the libraries. */ 115static const char *libdirs[] = { LIBDIRS NULL }; 116/* Verify that at least one directory is given. */ 117typedef int verify1[2 * (sizeof (libdirs) / sizeof (libdirs[0]) > 1) - 1]; 118 119/* Relocate the list of directories that contain the libraries. */ 120static void 121relocate_libdirs () 122{ 123 size_t i; 124 125 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++) 126 libdirs[i] = relocate (libdirs[i]); 127} 128 129/* Activate the list of directories in the LIBPATHVAR. */ 130static void 131activate_libdirs () 132{ 133 const char *old_value; 134 size_t total; 135 size_t i; 136 char *value; 137 char *p; 138 139 old_value = getenv (LIBPATHVAR); 140 if (old_value == NULL) 141 old_value = ""; 142 143 total = 0; 144 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++) 145 total += strlen (libdirs[i]) + 1; 146 total += strlen (old_value) + 1; 147 148 value = (char *) malloc (total); 149 if (value == NULL) 150 { 151 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted"); 152 exit (1); 153 } 154 p = value; 155 for (i = 0; i < sizeof (libdirs) / sizeof (libdirs[0]) - 1; i++) 156 { 157 size_t len = strlen (libdirs[i]); 158 memcpy (p, libdirs[i], len); 159 p += len; 160 *p++ = ':'; 161 } 162 if (old_value[0] != '\0') 163 strcpy (p, old_value); 164 else 165 p[-1] = '\0'; 166 167 if (setenv (LIBPATHVAR, value, 1) < 0) 168 { 169 fprintf (stderr, "%s: %s\n", program_name, "memory exhausted"); 170 exit (1); 171 } 172} 173 174int 175main (int argc, char *argv[]) 176{ 177 char *full_program_name; 178 179 /* Set the program name and perform preparations for 180 get_full_program_name() and relocate(). */ 181 set_program_name_and_installdir (argv[0], INSTALLPREFIX, INSTALLDIR); 182 183 /* Get the full program path. (Important if accessed through a symlink.) */ 184 full_program_name = get_full_program_name (); 185 if (full_program_name == NULL) 186 full_program_name = argv[0]; 187 188 /* Invoke the real program, with suffix ".bin". */ 189 argv[0] = add_dotbin (full_program_name); 190 relocate_libdirs (); 191 activate_libdirs (); 192 execv (argv[0], argv); 193 fprintf (stderr, "%s: could not execute %s: %s\n", 194 program_name, argv[0], strerror (errno)); 195 exit (127); 196} 197