ldd.c revision 1.2.12.4
1 /* $NetBSD: ldd.c,v 1.2.12.4 2012/03/17 18:28:31 bouyer 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 (at) 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 1.2.12.4 2012/03/17 18:28:31 bouyer 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 u_int _rtld_objcount; /* Number of shared objects */ 97 u_int _rtld_objloads; /* Number of objects loaded */ 98 99 Obj_Entry *_rtld_objmain; /* The main program shared object */ 100 int _rtld_pagesz; 101 102 Search_Path *_rtld_default_paths; 103 Search_Path *_rtld_paths; 104 Library_Xform *_rtld_xforms; 105 106 static void usage(void) __dead; 107 char *main_local; 108 char *main_progname; 109 110 static void 111 usage(void) 112 { 113 fprintf(stderr, "Usage: %s [-f <format 1>] [-f <format 2>] <filename>" 114 " ...\n", getprogname()); 115 exit(1); 116 } 117 118 int 119 main(int argc, char **argv) 120 { 121 char *fmt1 = NULL, *fmt2 = NULL; 122 int c; 123 124 #ifdef DEBUG 125 debug = 1; 126 #endif 127 while ((c = getopt(argc, argv, "f:")) != -1) { 128 switch (c) { 129 case 'f': 130 if (fmt1) { 131 if (fmt2) 132 errx(1, "Too many formats"); 133 fmt2 = optarg; 134 } else 135 fmt1 = optarg; 136 break; 137 default: 138 usage(); 139 /*NOTREACHED*/ 140 } 141 } 142 argc -= optind; 143 argv += optind; 144 145 if (argc <= 0) { 146 usage(); 147 /*NOTREACHED*/ 148 } 149 150 for (; argc != 0; argc--, argv++) { 151 int fd; 152 153 fd = open(*argv, O_RDONLY); 154 if (fd == -1) { 155 warn("%s", *argv); 156 continue; 157 } 158 if (elf_ldd(fd, *argv, fmt1, fmt2) == -1 && 159 /* Alpha never had 32 bit support. */ 160 #if defined(_LP64) && !defined(__alpha__) 161 elf32_ldd(fd, *argv, fmt1, fmt2) == -1 && 162 #endif 163 aout_ldd(fd, *argv, fmt1, fmt2) == -1) 164 warnx("%s", error_message); 165 close(fd); 166 } 167 168 return 0; 169 } 170 171 /* 172 * Error reporting function. Use it like printf. If formats the message 173 * into a buffer, and sets things up so that the next call to dlerror() 174 * will return the message. 175 */ 176 void 177 _rtld_error(const char *fmt, ...) 178 { 179 static char buf[512]; 180 va_list ap; 181 va_start(ap, fmt); 182 xvsnprintf(buf, sizeof buf, fmt, ap); 183 error_message = buf; 184 va_end(ap); 185 } 186 187 char * 188 dlerror() 189 { 190 char *msg = error_message; 191 error_message = NULL; 192 return msg; 193 } 194 195 void 196 fmtprint(const char *libname, Obj_Entry *obj, const char *fmt1, 197 const char *fmt2) 198 { 199 const char *libpath = obj ? obj->path : "not found"; 200 char libnamebuf[200]; 201 char *libmajor = NULL; 202 const char *fmt; 203 char *cp; 204 int c; 205 206 if (strncmp(libname, "lib", 3) == 0 && 207 (cp = strstr(libname, ".so")) != NULL) { 208 int i = cp - (libname + 3); 209 210 if (i >= sizeof(libnamebuf)) 211 i = sizeof(libnamebuf) - 1; 212 (void)memcpy(libnamebuf, libname + 3, i); 213 libnamebuf[i] = '\0'; 214 if (cp[3] && isdigit((unsigned char)cp[4])) 215 libmajor = &cp[4]; 216 libname = libnamebuf; 217 } 218 219 if (fmt1 == NULL) 220 fmt1 = libmajor != NULL ? 221 "\t-l%o.%m => %p\n" : 222 "\t-l%o => %p\n"; 223 if (fmt2 == NULL) 224 fmt2 = "\t%o => %p\n"; 225 226 fmt = libname == libnamebuf ? fmt1 : fmt2; 227 while ((c = *fmt++) != '\0') { 228 switch (c) { 229 default: 230 putchar(c); 231 continue; 232 case '\\': 233 switch (c = *fmt) { 234 case '\0': 235 continue; 236 case 'n': 237 putchar('\n'); 238 break; 239 case 't': 240 putchar('\t'); 241 break; 242 } 243 break; 244 case '%': 245 switch (c = *fmt) { 246 case '\0': 247 continue; 248 case '%': 249 default: 250 putchar(c); 251 break; 252 case 'A': 253 printf("%s", main_local); 254 break; 255 case 'a': 256 printf("%s", main_progname); 257 break; 258 case 'o': 259 printf("%s", libname); 260 break; 261 case 'm': 262 printf("%s", libmajor); 263 break; 264 case 'n': 265 /* XXX: not supported for elf */ 266 break; 267 case 'p': 268 printf("%s", libpath); 269 break; 270 case 'x': 271 printf("%p", obj ? obj->mapbase : 0); 272 break; 273 } 274 break; 275 } 276 ++fmt; 277 } 278 } 279 280 void 281 print_needed(Obj_Entry *obj, const char *fmt1, const char *fmt2) 282 { 283 const Needed_Entry *needed; 284 285 for (needed = obj->needed; needed != NULL; needed = needed->next) { 286 const char *libname = obj->strtab + needed->name; 287 288 if (needed->obj != NULL) { 289 if (!needed->obj->printed) { 290 fmtprint(libname, needed->obj, fmt1, fmt2); 291 needed->obj->printed = 1; 292 print_needed(needed->obj, fmt1, fmt2); 293 } 294 } else { 295 fmtprint(libname, needed->obj, fmt1, fmt2); 296 } 297 } 298 } 299
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