1 /* $NetBSD: ldd.c,v 1.22 2014/03/02 03:55:19 matt Exp $ */ 2 3 /*- 4 * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Paul Kranenburg. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Copyright 1996 John D. Polstra. 34 * Copyright 1996 Matt Thomas <matt@3am-software.com> 35 * All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by John Polstra. 48 * 4. The name of the author may not be used to endorse or promote products 49 * derived from this software without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 52 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 53 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 54 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 55 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 56 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 60 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 61 */ 62 63 #include <sys/cdefs.h> 64 #ifndef lint 65 __RCSID("$NetBSD: ldd.c,v 1.22 2014/03/02 03:55:19 matt Exp $"); 66 #endif /* not lint */ 67 68 #include <sys/types.h> 69 #include <sys/mman.h> 70 #include <sys/wait.h> 71 72 #include <dirent.h> 73 #include <err.h> 74 #include <errno.h> 75 #include <fcntl.h> 76 #include <stdarg.h> 77 #include <stdio.h> 78 #include <stdlib.h> 79 #include <string.h> 80 #include <unistd.h> 81 #include <ctype.h> 82 83 #include "debug.h" 84 #include "rtld.h" 85 #include "ldd.h" 86 87 /* 88 * Data declarations. 89 */ 90 static char *error_message; /* Message for dlopen(), or NULL */ 91 bool _rtld_trust; /* False for setuid and setgid programs */ 92 /* 93 * This may be ELF64 or ELF32 but since they are used opaquely it doesn't 94 * really matter. 95 */ 96 Obj_Entry *_rtld_objlist; /* Head of linked list of shared objects */ 97 Obj_Entry **_rtld_objtail = &_rtld_objlist; 98 /* Link field of last object in list */ 99 u_int _rtld_objcount; /* Number of shared objects */ 100 u_int _rtld_objloads; /* Number of objects loaded */ 101 102 Obj_Entry *_rtld_objmain; /* The main program shared object */ 103 size_t _rtld_pagesz; 104 105 Search_Path *_rtld_default_paths; 106 Search_Path *_rtld_paths; 107 Library_Xform *_rtld_xforms; 108 109 static void usage(void) __dead; 110 char *main_local; 111 char *main_progname; 112 113 static void 114 usage(void) 115 { 116 fprintf(stderr, "Usage: %s [-f <format 1>] [-f <format 2>] <filename>" 117 " ...\n", getprogname()); 118 exit(1); 119 } 120 121 int 122 main(int argc, char **argv) 123 { 124 const char *fmt1 = NULL, *fmt2 = NULL; 125 int c; 126 127 #ifdef DEBUG 128 debug = 1; 129 #endif 130 while ((c = getopt(argc, argv, "f:o")) != -1) { 131 switch (c) { 132 case 'f': 133 if (fmt1) { 134 if (fmt2) 135 errx(1, "Too many formats"); 136 fmt2 = optarg; 137 } else 138 fmt1 = optarg; 139 break; 140 case 'o': 141 if (fmt1 || fmt2) 142 errx(1, "Cannot use -o and -f together"); 143 fmt1 = "%a:-l%o.%m => %p\n"; 144 break; 145 default: 146 usage(); 147 /*NOTREACHED*/ 148 } 149 } 150 argc -= optind; 151 argv += optind; 152 153 if (argc <= 0) { 154 usage(); 155 /*NOTREACHED*/ 156 } 157 158 for (; argc != 0; argc--, argv++) { 159 int fd; 160 161 fd = open(*argv, O_RDONLY); 162 if (fd == -1) { 163 warn("%s", *argv); 164 continue; 165 } 166 if (elf_ldd(fd, *argv, fmt1, fmt2) == -1 167 /* Alpha never had 32 bit support. */ 168 #if (defined(_LP64) && !defined(ELF64_ONLY)) || defined(MIPS_N32) 169 && elf32_ldd(fd, *argv, fmt1, fmt2) == -1 170 #if defined(__mips__) && 0 /* XXX this is still hosed for some reason */ 171 && elf32_ldd_compat(fd, *argv, fmt1, fmt2) == -1 172 #endif 173 #endif 174 ) 175 warnx("%s", error_message); 176 close(fd); 177 } 178 179 return 0; 180 } 181 182 /* 183 * Error reporting function. Use it like printf. If formats the message 184 * into a buffer, and sets things up so that the next call to dlerror() 185 * will return the message. 186 */ 187 void 188 _rtld_error(const char *fmt, ...) 189 { 190 static char buf[512]; 191 va_list ap; 192 va_start(ap, fmt); 193 xvsnprintf(buf, sizeof buf, fmt, ap); 194 error_message = buf; 195 va_end(ap); 196 } 197 198 char * 199 dlerror() 200 { 201 char *msg = error_message; 202 error_message = NULL; 203 return msg; 204 } 205 206 void 207 _rtld_die(void) 208 { 209 const char *msg = dlerror(); 210 211 if (msg == NULL) 212 msg = "Fatal error"; 213 xerrx(1, "%s", msg); 214 } 215 216 void 217 _rtld_shared_enter(void) 218 { 219 } 220 221 void 222 _rtld_shared_exit(void) 223 { 224 } 225 226 void 227 _rtld_exclusive_enter(sigset_t *mask) 228 { 229 } 230 231 void 232 _rtld_exclusive_exit(sigset_t *mask) 233 { 234 } 235