1 /* $NetBSD: ldd.c,v 1.9 2009/08/22 06:52:16 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 1.9 2009/08/22 06:52:16 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 <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 Obj_Entry *_rtld_objlist; /* Head of linked list of shared objects */ 93 Obj_Entry **_rtld_objtail = &_rtld_objlist; 94 /* Link field of last object in list */ 95 Obj_Entry *_rtld_objmain; /* The main program shared object */ 96 unsigned int _rtld_pagesz; 97 98 Search_Path *_rtld_default_paths; 99 Search_Path *_rtld_paths; 100 Library_Xform *_rtld_xforms; 101 102 static void usage(void) __dead; 103 char *main_local; 104 char *main_progname; 105 106 static void 107 usage(void) 108 { 109 fprintf(stderr, "Usage: %s [-f <format 1>] [-f <format 2>] <filename>" 110 " ...\n", getprogname()); 111 exit(1); 112 } 113 114 int 115 main(int argc, char **argv) 116 { 117 char *fmt1 = NULL, *fmt2 = NULL; 118 int c; 119 120 #ifdef DEBUG 121 debug = 1; 122 #endif 123 while ((c = getopt(argc, argv, "f:")) != -1) { 124 switch (c) { 125 case 'f': 126 if (fmt1) { 127 if (fmt2) 128 errx(1, "Too many formats"); 129 fmt2 = optarg; 130 } else 131 fmt1 = optarg; 132 break; 133 default: 134 usage(); 135 /*NOTREACHED*/ 136 } 137 } 138 argc -= optind; 139 argv += optind; 140 141 if (argc <= 0) { 142 usage(); 143 /*NOTREACHED*/ 144 } 145 146 for (; argc != 0; argc--, argv++) { 147 int fd; 148 149 fd = open(*argv, O_RDONLY); 150 if (fd == -1) { 151 warn("%s", *argv); 152 continue; 153 } 154 if (elf_ldd(fd, *argv, fmt1, fmt2) == -1 155 /* Alpha never had 32 bit support. */ 156 #if defined(_LP64) && !defined(__alpha__) 157 && elf32_ldd(fd, *argv, fmt1, fmt2) == -1 158 #endif 159 ) 160 warnx("%s", error_message); 161 close(fd); 162 } 163 164 return 0; 165 } 166 167 /* 168 * Error reporting function. Use it like printf. If formats the message 169 * into a buffer, and sets things up so that the next call to dlerror() 170 * will return the message. 171 */ 172 void 173 _rtld_error(const char *fmt, ...) 174 { 175 static char buf[512]; 176 va_list ap; 177 va_start(ap, fmt); 178 xvsnprintf(buf, sizeof buf, fmt, ap); 179 error_message = buf; 180 va_end(ap); 181 } 182 183 char * 184 dlerror() 185 { 186 char *msg = error_message; 187 error_message = NULL; 188 return msg; 189 } 190 191 void 192 fmtprint(const char *libname, Obj_Entry *obj, const char *fmt1, 193 const char *fmt2) 194 { 195 const char *libpath = obj ? obj->path : "not found"; 196 char libnamebuf[200]; 197 char *libmajor = NULL; 198 const char *fmt; 199 char *cp; 200 int c; 201 202 if (strncmp(libname, "lib", 3) == 0 && 203 (cp = strstr(libname, ".so")) != NULL) { 204 int i = cp - (libname + 3); 205 206 if (i >= sizeof(libnamebuf)) 207 i = sizeof(libnamebuf) - 1; 208 (void)memcpy(libnamebuf, libname + 3, i); 209 libnamebuf[i] = '\0'; 210 if (cp[3] && isdigit((unsigned char)cp[4])) 211 libmajor = &cp[4]; 212 libname = libnamebuf; 213 } 214 215 if (fmt1 == NULL) 216 fmt1 = libmajor != NULL ? 217 "\t-l%o.%m => %p\n" : 218 "\t-l%o => %p\n"; 219 if (fmt2 == NULL) 220 fmt2 = "\t%o => %p\n"; 221 222 fmt = libname == libnamebuf ? fmt1 : fmt2; 223 while ((c = *fmt++) != '\0') { 224 switch (c) { 225 default: 226 putchar(c); 227 continue; 228 case '\\': 229 switch (c = *fmt) { 230 case '\0': 231 continue; 232 case 'n': 233 putchar('\n'); 234 break; 235 case 't': 236 putchar('\t'); 237 break; 238 } 239 break; 240 case '%': 241 switch (c = *fmt) { 242 case '\0': 243 continue; 244 case '%': 245 default: 246 putchar(c); 247 break; 248 case 'A': 249 printf("%s", main_local); 250 break; 251 case 'a': 252 printf("%s", main_progname); 253 break; 254 case 'o': 255 printf("%s", libname); 256 break; 257 case 'm': 258 printf("%s", libmajor); 259 break; 260 case 'n': 261 /* XXX: not supported for elf */ 262 break; 263 case 'p': 264 printf("%s", libpath); 265 break; 266 case 'x': 267 printf("%p", obj ? obj->mapbase : 0); 268 break; 269 } 270 break; 271 } 272 ++fmt; 273 } 274 } 275 276 void 277 print_needed(Obj_Entry *obj, const char *fmt1, const char *fmt2) 278 { 279 const Needed_Entry *needed; 280 281 for (needed = obj->needed; needed != NULL; needed = needed->next) { 282 const char *libname = obj->strtab + needed->name; 283 284 if (needed->obj != NULL) { 285 print_needed(needed->obj, fmt1, fmt2); 286 if (!needed->obj->printed) { 287 fmtprint(libname, needed->obj, fmt1, fmt2); 288 needed->obj->printed = 1; 289 } 290 } else { 291 fmtprint(libname, needed->obj, fmt1, fmt2); 292 } 293 } 294 } 295