1 /* 2 * Copyright (c) 1993 Paul Kranenburg 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Paul Kranenburg. 16 * 4. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * $FreeBSD: src/usr.bin/ldd/ldd.c,v 1.18.2.7 2002/02/27 18:35:53 sobomax Exp $ 31 * $DragonFly: src/usr.bin/ldd/ldd.c,v 1.2 2003/06/17 04:29:27 dillon Exp $ 32 */ 33 34 #include <sys/wait.h> 35 #include <machine/elf.h> 36 #include <a.out.h> 37 #include <dlfcn.h> 38 #include <err.h> 39 #include <fcntl.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <unistd.h> 43 44 extern void dump_file __P((const char *)); 45 extern int error_count; 46 47 void 48 usage() 49 { 50 fprintf(stderr, "usage: ldd [-v] [-f format] program ...\n"); 51 exit(1); 52 } 53 54 int 55 main(argc, argv) 56 int argc; 57 char *argv[]; 58 { 59 char *fmt1 = NULL, *fmt2 = NULL; 60 int rval; 61 int c; 62 int vflag = 0; 63 64 while ((c = getopt(argc, argv, "vf:")) != -1) { 65 switch (c) { 66 case 'v': 67 vflag++; 68 break; 69 case 'f': 70 if (fmt1) { 71 if (fmt2) 72 errx(1, "too many formats"); 73 fmt2 = optarg; 74 } else 75 fmt1 = optarg; 76 break; 77 default: 78 usage(); 79 /*NOTREACHED*/ 80 } 81 } 82 argc -= optind; 83 argv += optind; 84 85 if (vflag && fmt1) 86 errx(1, "-v may not be used with -f"); 87 88 if (argc <= 0) { 89 usage(); 90 /*NOTREACHED*/ 91 } 92 93 #ifdef __i386__ 94 if (vflag) { 95 for (c = 0; c < argc; c++) 96 dump_file(argv[c]); 97 exit(error_count == 0 ? EXIT_SUCCESS : EXIT_FAILURE); 98 } 99 #endif 100 101 /* ld.so magic */ 102 setenv("LD_TRACE_LOADED_OBJECTS", "1", 1); 103 if (fmt1) 104 setenv("LD_TRACE_LOADED_OBJECTS_FMT1", fmt1, 1); 105 if (fmt2) 106 setenv("LD_TRACE_LOADED_OBJECTS_FMT2", fmt2, 1); 107 108 rval = 0; 109 for ( ; argc > 0; argc--, argv++) { 110 int fd; 111 union { 112 struct exec aout; 113 Elf_Ehdr elf; 114 } hdr; 115 int n; 116 int status; 117 int file_ok; 118 int is_shlib; 119 120 if ((fd = open(*argv, O_RDONLY, 0)) < 0) { 121 warn("%s", *argv); 122 rval |= 1; 123 continue; 124 } 125 if ((n = read(fd, &hdr, sizeof hdr)) == -1) { 126 warn("%s: can't read program header", *argv); 127 (void)close(fd); 128 rval |= 1; 129 continue; 130 } 131 132 file_ok = 1; 133 is_shlib = 0; 134 if (n >= sizeof hdr.aout && !N_BADMAG(hdr.aout)) { 135 /* a.out file */ 136 if ((N_GETFLAG(hdr.aout) & EX_DPMASK) != EX_DYNAMIC 137 #if 1 /* Compatibility */ 138 || hdr.aout.a_entry < __LDPGSZ 139 #endif 140 ) { 141 warnx("%s: not a dynamic executable", *argv); 142 file_ok = 0; 143 } 144 } else if (n >= sizeof hdr.elf && IS_ELF(hdr.elf)) { 145 Elf_Ehdr ehdr; 146 Elf_Phdr phdr; 147 int dynamic = 0, i; 148 149 if (lseek(fd, 0, SEEK_SET) == -1 || 150 read(fd, &ehdr, sizeof ehdr) != sizeof ehdr || 151 lseek(fd, ehdr.e_phoff, SEEK_SET) == -1 152 ) { 153 warnx("%s: can't read program header", *argv); 154 file_ok = 0; 155 } else { 156 for (i = 0; i < ehdr.e_phnum; i++) { 157 if (read(fd, &phdr, ehdr.e_phentsize) 158 != sizeof phdr) { 159 warnx("%s: can't read program header", 160 *argv); 161 file_ok = 0; 162 break; 163 } 164 if (phdr.p_type == PT_DYNAMIC) 165 dynamic = 1; 166 } 167 } 168 if (!dynamic) { 169 warnx("%s: not a dynamic executable", *argv); 170 file_ok = 0; 171 } else if (hdr.elf.e_type == ET_DYN) { 172 if (hdr.elf.e_ident[EI_OSABI] & ELFOSABI_FREEBSD) { 173 is_shlib = 1; 174 } else { 175 warnx("%s: not a FreeBSD ELF shared " 176 "object", *argv); 177 file_ok = 0; 178 } 179 } 180 } else { 181 warnx("%s: not a dynamic executable", *argv); 182 file_ok = 0; 183 } 184 (void)close(fd); 185 if (!file_ok) { 186 rval |= 1; 187 continue; 188 } 189 190 setenv("LD_TRACE_LOADED_OBJECTS_PROGNAME", *argv, 1); 191 if (fmt1 == NULL && fmt2 == NULL) 192 /* Default formats */ 193 printf("%s:\n", *argv); 194 195 fflush(stdout); 196 197 switch (fork()) { 198 case -1: 199 err(1, "fork"); 200 break; 201 default: 202 if (wait(&status) <= 0) { 203 warn("wait"); 204 rval |= 1; 205 } else if (WIFSIGNALED(status)) { 206 fprintf(stderr, "%s: signal %d\n", 207 *argv, WTERMSIG(status)); 208 rval |= 1; 209 } else if (WIFEXITED(status) && WEXITSTATUS(status)) { 210 fprintf(stderr, "%s: exit status %d\n", 211 *argv, WEXITSTATUS(status)); 212 rval |= 1; 213 } 214 break; 215 case 0: 216 if (is_shlib == 0) { 217 execl(*argv, *argv, (char *)NULL); 218 warn("%s", *argv); 219 } else { 220 dlopen(*argv, RTLD_TRACE); 221 warnx("%s: %s", *argv, dlerror()); 222 } 223 _exit(1); 224 } 225 } 226 227 return rval; 228 } 229