ldd.c revision 1.12
1 /* $NetBSD: ldd.c,v 1.12 2009/12/13 08:50:56 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 (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 1.12 2009/12/13 08:50:56 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 size_t _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 const char *fmt1 = NULL, *fmt2 = NULL; 118 int c; 119 120 #ifdef DEBUG 121 debug = 1; 122 #endif 123 while ((c = getopt(argc, argv, "f:o")) != -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 case 'o': 134 if (fmt1 || fmt2) 135 errx(1, "Cannot use -o and -f together"); 136 fmt1 = "%a:-l%o.%m => %p\n"; 137 break; 138 default: 139 usage(); 140 /*NOTREACHED*/ 141 } 142 } 143 argc -= optind; 144 argv += optind; 145 146 if (argc <= 0) { 147 usage(); 148 /*NOTREACHED*/ 149 } 150 151 for (; argc != 0; argc--, argv++) { 152 int fd; 153 154 fd = open(*argv, O_RDONLY); 155 if (fd == -1) { 156 warn("%s", *argv); 157 continue; 158 } 159 if (elf_ldd(fd, *argv, fmt1, fmt2) == -1 160 /* Alpha never had 32 bit support. */ 161 #if defined(_LP64) && !defined(__alpha__) 162 && elf32_ldd(fd, *argv, fmt1, fmt2) == -1 163 #ifdef __mips__ 164 && elf32_ldd_compat(fd, *argv, fmt1, fmt2) == -1 165 #endif 166 #endif 167 ) 168 warnx("%s", error_message); 169 close(fd); 170 } 171 172 return 0; 173 } 174 175 /* 176 * Error reporting function. Use it like printf. If formats the message 177 * into a buffer, and sets things up so that the next call to dlerror() 178 * will return the message. 179 */ 180 void 181 _rtld_error(const char *fmt, ...) 182 { 183 static char buf[512]; 184 va_list ap; 185 va_start(ap, fmt); 186 xvsnprintf(buf, sizeof buf, fmt, ap); 187 error_message = buf; 188 va_end(ap); 189 } 190 191 char * 192 dlerror() 193 { 194 char *msg = error_message; 195 error_message = NULL; 196 return msg; 197 } 198 199 void 200 fmtprint(const char *libname, Obj_Entry *obj, const char *fmt1, 201 const char *fmt2) 202 { 203 const char *libpath = obj ? obj->path : "not found"; 204 char libnamebuf[200]; 205 char *libmajor = NULL; 206 const char *fmt; 207 char *cp; 208 int c; 209 210 if (strncmp(libname, "lib", 3) == 0 && 211 (cp = strstr(libname, ".so")) != NULL) { 212 int i = cp - (libname + 3); 213 214 if (i >= sizeof(libnamebuf)) 215 i = sizeof(libnamebuf) - 1; 216 (void)memcpy(libnamebuf, libname + 3, i); 217 libnamebuf[i] = '\0'; 218 if (cp[3] && isdigit((unsigned char)cp[4])) 219 libmajor = &cp[4]; 220 libname = libnamebuf; 221 } 222 223 if (fmt1 == NULL) 224 fmt1 = libmajor != NULL ? 225 "\t-l%o.%m => %p\n" : 226 "\t-l%o => %p\n"; 227 if (fmt2 == NULL) 228 fmt2 = "\t%o => %p\n"; 229 230 fmt = libname == libnamebuf ? fmt1 : fmt2; 231 while ((c = *fmt++) != '\0') { 232 switch (c) { 233 default: 234 putchar(c); 235 continue; 236 case '\\': 237 switch (c = *fmt) { 238 case '\0': 239 continue; 240 case 'n': 241 putchar('\n'); 242 break; 243 case 't': 244 putchar('\t'); 245 break; 246 } 247 break; 248 case '%': 249 switch (c = *fmt) { 250 case '\0': 251 continue; 252 case '%': 253 default: 254 putchar(c); 255 break; 256 case 'A': 257 printf("%s", main_local); 258 break; 259 case 'a': 260 printf("%s", main_progname); 261 break; 262 case 'o': 263 printf("%s", libname); 264 break; 265 case 'm': 266 printf("%s", libmajor); 267 break; 268 case 'n': 269 /* XXX: not supported for elf */ 270 break; 271 case 'p': 272 printf("%s", libpath); 273 break; 274 case 'x': 275 printf("%p", obj ? obj->mapbase : 0); 276 break; 277 } 278 break; 279 } 280 ++fmt; 281 } 282 } 283 284 void 285 print_needed(Obj_Entry *obj, const char *fmt1, const char *fmt2) 286 { 287 const Needed_Entry *needed; 288 289 for (needed = obj->needed; needed != NULL; needed = needed->next) { 290 const char *libname = obj->strtab + needed->name; 291 292 if (needed->obj != NULL) { 293 print_needed(needed->obj, fmt1, fmt2); 294 if (!needed->obj->printed) { 295 fmtprint(libname, needed->obj, fmt1, fmt2); 296 needed->obj->printed = 1; 297 } 298 } else { 299 fmtprint(libname, needed->obj, fmt1, fmt2); 300 } 301 } 302 } 303
Indexes created Thu Oct 23 22:10:10 GMT 2025