1 /* $NetBSD: ldd.c,v 1.5 2009/02/03 03:01:02 mrg 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 1.5 2009/02/03 03:01:02 mrg Exp $"); 66 #endif /* not lint */ 67 68 #include <sys/types.h> 69 #include <sys/mman.h> 70 #include <sys/wait.h> 71 72 #include <a.out.h> 73 #include <dirent.h> 74 #include <err.h> 75 #include <errno.h> 76 #include <fcntl.h> 77 #include <stdarg.h> 78 #include <stdio.h> 79 #include <stdlib.h> 80 #include <string.h> 81 #include <unistd.h> 82 #include <ctype.h> 83 84 #include "debug.h" 85 #include "rtld.h" 86 #include "ldd.h" 87 88 /* 89 * Data declarations. 90 */ 91 static char *error_message; /* Message for dlopen(), or NULL */ 92 bool _rtld_trust; /* False for setuid and setgid programs */ 93 Obj_Entry *_rtld_objlist; /* Head of linked list of shared objects */ 94 Obj_Entry **_rtld_objtail = &_rtld_objlist; 95 /* Link field of last object in list */ 96 Obj_Entry *_rtld_objmain; /* The main program shared object */ 97 int _rtld_pagesz; 98 99 Search_Path *_rtld_default_paths; 100 Search_Path *_rtld_paths; 101 Library_Xform *_rtld_xforms; 102 103 static void usage(void) __dead; 104 char *main_local; 105 char *main_progname; 106 107 static void 108 usage(void) 109 { 110 fprintf(stderr, "Usage: %s [-f <format 1>] [-f <format 2>] <filename>" 111 " ...\n", getprogname()); 112 exit(1); 113 } 114 115 int 116 main(int argc, char **argv) 117 { 118 char *fmt1 = NULL, *fmt2 = NULL; 119 int c; 120 121 #ifdef DEBUG 122 debug = 1; 123 #endif 124 while ((c = getopt(argc, argv, "f:")) != -1) { 125 switch (c) { 126 case 'f': 127 if (fmt1) { 128 if (fmt2) 129 errx(1, "Too many formats"); 130 fmt2 = optarg; 131 } else 132 fmt1 = optarg; 133 break; 134 default: 135 usage(); 136 /*NOTREACHED*/ 137 } 138 } 139 argc -= optind; 140 argv += optind; 141 142 if (argc <= 0) { 143 usage(); 144 /*NOTREACHED*/ 145 } 146 147 for (; argc != 0; argc--, argv++) { 148 int fd; 149 150 fd = open(*argv, O_RDONLY); 151 if (fd == -1) { 152 warn("%s", *argv); 153 continue; 154 } 155 if (elf_ldd(fd, *argv, fmt1, fmt2) == -1 && 156 /* Alpha never had 32 bit support. */ 157 #if defined(_LP64) && !defined(__alpha__) 158 elf32_ldd(fd, *argv, fmt1, fmt2) == -1 && 159 #endif 160 aout_ldd(fd, *argv, fmt1, fmt2) == -1) 161 warnx("%s", error_message); 162 close(fd); 163 } 164 165 return 0; 166 } 167 168 /* 169 * Error reporting function. Use it like printf. If formats the message 170 * into a buffer, and sets things up so that the next call to dlerror() 171 * will return the message. 172 */ 173 void 174 _rtld_error(const char *fmt, ...) 175 { 176 static char buf[512]; 177 va_list ap; 178 va_start(ap, fmt); 179 xvsnprintf(buf, sizeof buf, fmt, ap); 180 error_message = buf; 181 va_end(ap); 182 } 183 184 char * 185 dlerror() 186 { 187 char *msg = error_message; 188 error_message = NULL; 189 return msg; 190 } 191 192 void 193 fmtprint(const char *libname, Obj_Entry *obj, const char *fmt1, 194 const char *fmt2) 195 { 196 const char *libpath = obj ? obj->path : "not found"; 197 char libnamebuf[200]; 198 char *libmajor = NULL; 199 const char *fmt; 200 char *cp; 201 int c; 202 203 if (strncmp(libname, "lib", 3) == 0 && 204 (cp = strstr(libname, ".so")) != NULL) { 205 int i = cp - (libname + 3); 206 207 if (i >= sizeof(libnamebuf)) 208 i = sizeof(libnamebuf) - 1; 209 (void)memcpy(libnamebuf, libname + 3, i); 210 libnamebuf[i] = '\0'; 211 if (cp[3] && isdigit((unsigned char)cp[4])) 212 libmajor = &cp[4]; 213 libname = libnamebuf; 214 } 215 216 if (fmt1 == NULL) 217 fmt1 = libmajor != NULL ? 218 "\t-l%o.%m => %p\n" : 219 "\t-l%o => %p\n"; 220 if (fmt2 == NULL) 221 fmt2 = "\t%o => %p\n"; 222 223 fmt = libname == libnamebuf ? fmt1 : fmt2; 224 while ((c = *fmt++) != '\0') { 225 switch (c) { 226 default: 227 putchar(c); 228 continue; 229 case '\\': 230 switch (c = *fmt) { 231 case '\0': 232 continue; 233 case 'n': 234 putchar('\n'); 235 break; 236 case 't': 237 putchar('\t'); 238 break; 239 } 240 break; 241 case '%': 242 switch (c = *fmt) { 243 case '\0': 244 continue; 245 case '%': 246 default: 247 putchar(c); 248 break; 249 case 'A': 250 printf("%s", main_local); 251 break; 252 case 'a': 253 printf("%s", main_progname); 254 break; 255 case 'o': 256 printf("%s", libname); 257 break; 258 case 'm': 259 printf("%s", libmajor); 260 break; 261 case 'n': 262 /* XXX: not supported for elf */ 263 break; 264 case 'p': 265 printf("%s", libpath); 266 break; 267 case 'x': 268 printf("%p", obj ? obj->mapbase : 0); 269 break; 270 } 271 break; 272 } 273 ++fmt; 274 } 275 } 276 277 void 278 print_needed(Obj_Entry *obj, const char *fmt1, const char *fmt2) 279 { 280 const Needed_Entry *needed; 281 282 for (needed = obj->needed; needed != NULL; needed = needed->next) { 283 const char *libname = obj->strtab + needed->name; 284 285 if (needed->obj != NULL) { 286 print_needed(needed->obj, fmt1, fmt2); 287 if (!needed->obj->printed) { 288 fmtprint(libname, needed->obj, fmt1, fmt2); 289 needed->obj->printed = 1; 290 } 291 } else { 292 fmtprint(libname, needed->obj, fmt1, fmt2); 293 } 294 } 295 } 296