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}". */ 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 ((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. */ 113static const char *libdirs[] = { LIBDIRS NULL }; 114/* Verify that at least one directory is given. */ 115typedef int verify1[2 * (sizeof (libdirs) / sizeof (libdirs[0]) > 1) - 1]; 116 117/* Relocate the list of directories that contain the libraries. */ 118static void 119relocate_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. */ 128static void 129activate_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 172int 173main (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