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}". */ 61static char * 62add_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. */ 112static const char *libdirs[] = { LIBDIRS NULL }; 113/* Verify that at least one directory is given. */ 114typedef int verify1[2 * (sizeof (libdirs) / sizeof (libdirs[0]) > 1) - 1]; 115 116/* Relocate the list of directories that contain the libraries. */ 117static void 118relocate_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. */ 127static void 128activate_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 171int 172main (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