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 1.3 2003/10/04 20:36:47 hmp 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(const char *); 45 extern int error_count; 46 47 void 48 usage(void) 49 { 50 fprintf(stderr, "usage: ldd [-v] [-f format] program ...\n"); 51 exit(1); 52 } 53 54 int 55 main(int argc, char **argv) 56 { 57 char *fmt1 = NULL, *fmt2 = NULL; 58 int rval; 59 int c; 60 int vflag = 0; 61 62 while ((c = getopt(argc, argv, "vf:")) != -1) { 63 switch (c) { 64 case 'v': 65 vflag++; 66 break; 67 case 'f': 68 if (fmt1) { 69 if (fmt2) 70 errx(1, "too many formats"); 71 fmt2 = optarg; 72 } else 73 fmt1 = optarg; 74 break; 75 default: 76 usage(); 77 /*NOTREACHED*/ 78 } 79 } 80 argc -= optind; 81 argv += optind; 82 83 if (vflag && fmt1) 84 errx(1, "-v may not be used with -f"); 85 86 if (argc <= 0) { 87 usage(); 88 /*NOTREACHED*/ 89 } 90 91 #ifdef __i386__ 92 if (vflag) { 93 for (c = 0; c < argc; c++) 94 dump_file(argv[c]); 95 exit(error_count == 0 ? EXIT_SUCCESS : EXIT_FAILURE); 96 } 97 #endif 98 99 /* ld.so magic */ 100 setenv("LD_TRACE_LOADED_OBJECTS", "1", 1); 101 if (fmt1) 102 setenv("LD_TRACE_LOADED_OBJECTS_FMT1", fmt1, 1); 103 if (fmt2) 104 setenv("LD_TRACE_LOADED_OBJECTS_FMT2", fmt2, 1); 105 106 rval = 0; 107 for ( ; argc > 0; argc--, argv++) { 108 int fd; 109 union { 110 struct exec aout; 111 Elf_Ehdr elf; 112 } hdr; 113 int n; 114 int status; 115 int file_ok; 116 int is_shlib; 117 118 if ((fd = open(*argv, O_RDONLY, 0)) < 0) { 119 warn("%s", *argv); 120 rval |= 1; 121 continue; 122 } 123 if ((n = read(fd, &hdr, sizeof hdr)) == -1) { 124 warn("%s: can't read program header", *argv); 125 (void)close(fd); 126 rval |= 1; 127 continue; 128 } 129 130 file_ok = 1; 131 is_shlib = 0; 132 if (n >= sizeof hdr.aout && !N_BADMAG(hdr.aout)) { 133 /* a.out file */ 134 if ((N_GETFLAG(hdr.aout) & EX_DPMASK) != EX_DYNAMIC 135 #if 1 /* Compatibility */ 136 || hdr.aout.a_entry < __LDPGSZ 137 #endif 138 ) { 139 warnx("%s: not a dynamic executable", *argv); 140 file_ok = 0; 141 } 142 } else if (n >= sizeof hdr.elf && IS_ELF(hdr.elf)) { 143 Elf_Ehdr ehdr; 144 Elf_Phdr phdr; 145 int dynamic = 0, i; 146 147 if (lseek(fd, 0, SEEK_SET) == -1 || 148 read(fd, &ehdr, sizeof ehdr) != sizeof ehdr || 149 lseek(fd, ehdr.e_phoff, SEEK_SET) == -1 150 ) { 151 warnx("%s: can't read program header", *argv); 152 file_ok = 0; 153 } else { 154 for (i = 0; i < ehdr.e_phnum; i++) { 155 if (read(fd, &phdr, ehdr.e_phentsize) 156 != sizeof phdr) { 157 warnx("%s: can't read program header", 158 *argv); 159 file_ok = 0; 160 break; 161 } 162 if (phdr.p_type == PT_DYNAMIC) 163 dynamic = 1; 164 } 165 } 166 if (!dynamic) { 167 warnx("%s: not a dynamic executable", *argv); 168 file_ok = 0; 169 } else if (hdr.elf.e_type == ET_DYN) { 170 if (hdr.elf.e_ident[EI_OSABI] & ELFOSABI_FREEBSD) { 171 is_shlib = 1; 172 } else { 173 warnx("%s: not a FreeBSD ELF shared " 174 "object", *argv); 175 file_ok = 0; 176 } 177 } 178 } else { 179 warnx("%s: not a dynamic executable", *argv); 180 file_ok = 0; 181 } 182 (void)close(fd); 183 if (!file_ok) { 184 rval |= 1; 185 continue; 186 } 187 188 setenv("LD_TRACE_LOADED_OBJECTS_PROGNAME", *argv, 1); 189 if (fmt1 == NULL && fmt2 == NULL) 190 /* Default formats */ 191 printf("%s:\n", *argv); 192 193 fflush(stdout); 194 195 switch (fork()) { 196 case -1: 197 err(1, "fork"); 198 break; 199 default: 200 if (wait(&status) <= 0) { 201 warn("wait"); 202 rval |= 1; 203 } else if (WIFSIGNALED(status)) { 204 fprintf(stderr, "%s: signal %d\n", 205 *argv, WTERMSIG(status)); 206 rval |= 1; 207 } else if (WIFEXITED(status) && WEXITSTATUS(status)) { 208 fprintf(stderr, "%s: exit status %d\n", 209 *argv, WEXITSTATUS(status)); 210 rval |= 1; 211 } 212 break; 213 case 0: 214 if (is_shlib == 0) { 215 execl(*argv, *argv, (char *)NULL); 216 warn("%s", *argv); 217 } else { 218 dlopen(*argv, RTLD_TRACE); 219 warnx("%s: %s", *argv, dlerror()); 220 } 221 _exit(1); 222 } 223 } 224 225 return rval; 226 } 227