1 /* $NetBSD: ldd_elfxx.c,v 1.8 2021/07/22 17:39:53 christos 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_elfxx.c,v 1.8 2021/07/22 17:39:53 christos Exp $"); 66 #endif /* not lint */ 67 68 #include <sys/types.h> 69 #include <sys/mman.h> 70 #include <sys/wait.h> 71 #include <sys/stat.h> 72 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 static void print_needed(Obj_Entry *, const char *, const char *); 89 static void fmtprint(const char *, Obj_Entry *, const char *, const char *); 90 91 /* 92 * elfxx_ldd() - bit-size independent ELF ldd implementation. 93 * returns 0 on success and -1 on failure. 94 */ 95 int 96 ELFNAME(ldd)(int fd, char *prog, char *path, const char *fmt1, const char *fmt2) 97 { 98 struct stat st; 99 100 if (lseek(fd, 0, SEEK_SET) < 0 || 101 fstat(fd, &st) < 0) { 102 _rtld_error("%s: %s", path, strerror(errno)); 103 return -1; 104 } 105 106 _rtld_pagesz = sysconf(_SC_PAGESIZE); 107 108 #ifdef RTLD_ARCH_SUBDIR 109 _rtld_add_paths(path, &_rtld_default_paths, 110 RTLD_DEFAULT_LIBRARY_PATH "/" RTLD_ARCH_SUBDIR); 111 #endif 112 _rtld_add_paths(path, &_rtld_default_paths, RTLD_DEFAULT_LIBRARY_PATH); 113 114 _rtld_paths = NULL; 115 _rtld_trust = (st.st_mode & (S_ISUID | S_ISGID)) == 0; 116 if (_rtld_trust) 117 _rtld_add_paths(path, &_rtld_paths, getenv("LD_LIBRARY_PATH")); 118 119 _rtld_process_hints(path, &_rtld_paths, &_rtld_xforms, _PATH_LD_HINTS); 120 _rtld_objmain = _rtld_map_object(xstrdup(path), fd, &st); 121 if (_rtld_objmain == NULL) 122 return -1; 123 124 _rtld_objmain->path = xstrdup(path); 125 _rtld_digest_dynamic(path, _rtld_objmain); 126 127 /* Link the main program into the list of objects. */ 128 *_rtld_objtail = _rtld_objmain; 129 _rtld_objtail = &_rtld_objmain->next; 130 ++_rtld_objmain->refcount; 131 132 (void) _rtld_load_needed_objects(_rtld_objmain, 0); 133 134 if (fmt1 == NULL) 135 printf("%s:\n", prog); 136 main_local = path; 137 main_progname = _rtld_objmain->path; 138 print_needed(_rtld_objmain, fmt1, fmt2); 139 140 while (_rtld_objlist != NULL) { 141 Obj_Entry *obj = _rtld_objlist; 142 _rtld_objlist = obj->next; 143 while (obj->rpaths != NULL) { 144 const Search_Path *rpath = obj->rpaths; 145 obj->rpaths = rpath->sp_next; 146 xfree(__UNCONST(rpath->sp_path)); 147 xfree(__UNCONST(rpath)); 148 } 149 while (obj->needed != NULL) { 150 const Needed_Entry *needed = obj->needed; 151 obj->needed = needed->next; 152 xfree(__UNCONST(needed)); 153 } 154 (void) munmap(obj->mapbase, obj->mapsize); 155 xfree(obj->path); 156 xfree(obj); 157 } 158 159 _rtld_objmain = NULL; 160 _rtld_objtail = &_rtld_objlist; 161 /* Need to free _rtld_paths? */ 162 163 return 0; 164 } 165 166 void 167 fmtprint(const char *libname, Obj_Entry *obj, const char *fmt1, 168 const char *fmt2) 169 { 170 const char *libpath = obj ? obj->path : "not found"; 171 char libnamebuf[200]; 172 char *libmajor = NULL; 173 const char *fmt; 174 char *cp; 175 int c; 176 177 if (strncmp(libname, "lib", 3) == 0 && 178 (cp = strstr(libname, ".so")) != NULL) { 179 size_t i = cp - (libname + 3); 180 181 if (i >= sizeof(libnamebuf)) 182 i = sizeof(libnamebuf) - 1; 183 (void)memcpy(libnamebuf, libname + 3, i); 184 libnamebuf[i] = '\0'; 185 if (cp[3] && isdigit((unsigned char)cp[4])) 186 libmajor = &cp[4]; 187 libname = libnamebuf; 188 } 189 190 if (fmt1 == NULL) 191 fmt1 = libmajor != NULL ? 192 "\t-l%o.%m => %p\n" : 193 "\t-l%o => %p\n"; 194 if (fmt2 == NULL) 195 fmt2 = "\t%o => %p\n"; 196 197 fmt = libname == libnamebuf ? fmt1 : fmt2; 198 while ((c = *fmt++) != '\0') { 199 switch (c) { 200 default: 201 putchar(c); 202 continue; 203 case '\\': 204 switch (c = *fmt) { 205 case '\0': 206 continue; 207 case 'n': 208 putchar('\n'); 209 break; 210 case 't': 211 putchar('\t'); 212 break; 213 } 214 break; 215 case '%': 216 switch (c = *fmt) { 217 case '\0': 218 continue; 219 case '%': 220 default: 221 putchar(c); 222 break; 223 case 'A': 224 printf("%s", main_local); 225 break; 226 case 'a': 227 printf("%s", main_progname); 228 break; 229 case 'o': 230 printf("%s", libname); 231 break; 232 case 'm': 233 printf("%s", libmajor); 234 break; 235 case 'n': 236 /* XXX: not supported for elf */ 237 break; 238 case 'p': 239 printf("%s", libpath); 240 break; 241 case 'x': 242 printf("%p", obj ? obj->mapbase : 0); 243 break; 244 } 245 break; 246 } 247 ++fmt; 248 } 249 } 250 251 void 252 print_needed(Obj_Entry *obj, const char *fmt1, const char *fmt2) 253 { 254 const Needed_Entry *needed; 255 256 for (needed = obj->needed; needed != NULL; needed = needed->next) { 257 const char *libname = obj->strtab + needed->name; 258 259 if (needed->obj != NULL) { 260 if (!needed->obj->printed) { 261 fmtprint(libname, needed->obj, fmt1, fmt2); 262 needed->obj->printed = 1; 263 print_needed(needed->obj, fmt1, fmt2); 264 } 265 } else { 266 fmtprint(libname, needed->obj, fmt1, fmt2); 267 } 268 } 269 } 270
Indexes created Sun Sep 21 20:09:37 GMT 2025