1 /* $NetBSD: ldd.c,v 1.14 2010/02/27 11:17:05 roy 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 1.14 2010/02/27 11:17:05 roy 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 int _rtld_objcount; /* Number of shared objects */ 96 Obj_Entry *_rtld_objmain; /* The main program shared object */ 97 size_t _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 const char *fmt1 = NULL, *fmt2 = NULL; 119 int c; 120 121 #ifdef DEBUG 122 debug = 1; 123 #endif 124 while ((c = getopt(argc, argv, "f:o")) != -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 case 'o': 135 if (fmt1 || fmt2) 136 errx(1, "Cannot use -o and -f together"); 137 fmt1 = "%a:-l%o.%m => %p\n"; 138 break; 139 default: 140 usage(); 141 /*NOTREACHED*/ 142 } 143 } 144 argc -= optind; 145 argv += optind; 146 147 if (argc <= 0) { 148 usage(); 149 /*NOTREACHED*/ 150 } 151 152 for (; argc != 0; argc--, argv++) { 153 int fd; 154 155 fd = open(*argv, O_RDONLY); 156 if (fd == -1) { 157 warn("%s", *argv); 158 continue; 159 } 160 if (elf_ldd(fd, *argv, fmt1, fmt2) == -1 161 /* Alpha never had 32 bit support. */ 162 #if defined(_LP64) && !defined(__alpha__) 163 && elf32_ldd(fd, *argv, fmt1, fmt2) == -1 164 #ifdef __mips__ 165 && elf32_ldd_compat(fd, *argv, fmt1, fmt2) == -1 166 #endif 167 #endif 168 ) 169 warnx("%s", error_message); 170 close(fd); 171 } 172 173 return 0; 174 } 175 176 /* 177 * Error reporting function. Use it like printf. If formats the message 178 * into a buffer, and sets things up so that the next call to dlerror() 179 * will return the message. 180 */ 181 void 182 _rtld_error(const char *fmt, ...) 183 { 184 static char buf[512]; 185 va_list ap; 186 va_start(ap, fmt); 187 xvsnprintf(buf, sizeof buf, fmt, ap); 188 error_message = buf; 189 va_end(ap); 190 } 191 192 char * 193 dlerror() 194 { 195 char *msg = error_message; 196 error_message = NULL; 197 return msg; 198 } 199 200 void 201 fmtprint(const char *libname, Obj_Entry *obj, const char *fmt1, 202 const char *fmt2) 203 { 204 const char *libpath = obj ? obj->path : "not found"; 205 char libnamebuf[200]; 206 char *libmajor = NULL; 207 const char *fmt; 208 char *cp; 209 int c; 210 211 if (strncmp(libname, "lib", 3) == 0 && 212 (cp = strstr(libname, ".so")) != NULL) { 213 int i = cp - (libname + 3); 214 215 if (i >= sizeof(libnamebuf)) 216 i = sizeof(libnamebuf) - 1; 217 (void)memcpy(libnamebuf, libname + 3, i); 218 libnamebuf[i] = '\0'; 219 if (cp[3] && isdigit((unsigned char)cp[4])) 220 libmajor = &cp[4]; 221 libname = libnamebuf; 222 } 223 224 if (fmt1 == NULL) 225 fmt1 = libmajor != NULL ? 226 "\t-l%o.%m => %p\n" : 227 "\t-l%o => %p\n"; 228 if (fmt2 == NULL) 229 fmt2 = "\t%o => %p\n"; 230 231 fmt = libname == libnamebuf ? fmt1 : fmt2; 232 while ((c = *fmt++) != '\0') { 233 switch (c) { 234 default: 235 putchar(c); 236 continue; 237 case '\\': 238 switch (c = *fmt) { 239 case '\0': 240 continue; 241 case 'n': 242 putchar('\n'); 243 break; 244 case 't': 245 putchar('\t'); 246 break; 247 } 248 break; 249 case '%': 250 switch (c = *fmt) { 251 case '\0': 252 continue; 253 case '%': 254 default: 255 putchar(c); 256 break; 257 case 'A': 258 printf("%s", main_local); 259 break; 260 case 'a': 261 printf("%s", main_progname); 262 break; 263 case 'o': 264 printf("%s", libname); 265 break; 266 case 'm': 267 printf("%s", libmajor); 268 break; 269 case 'n': 270 /* XXX: not supported for elf */ 271 break; 272 case 'p': 273 printf("%s", libpath); 274 break; 275 case 'x': 276 printf("%p", obj ? obj->mapbase : 0); 277 break; 278 } 279 break; 280 } 281 ++fmt; 282 } 283 } 284 285 void 286 print_needed(Obj_Entry *obj, const char *fmt1, const char *fmt2) 287 { 288 const Needed_Entry *needed; 289 290 for (needed = obj->needed; needed != NULL; needed = needed->next) { 291 const char *libname = obj->strtab + needed->name; 292 293 if (needed->obj != NULL) { 294 if (!needed->obj->printed) { 295 fmtprint(libname, needed->obj, fmt1, fmt2); 296 needed->obj->printed = 1; 297 print_needed(needed->obj, fmt1, fmt2); 298 } 299 } else { 300 fmtprint(libname, needed->obj, fmt1, fmt2); 301 } 302 } 303 } 304