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 1.5 2005/07/24 15:04:56 joerg Exp $ 32 */ 33 34 #include <sys/param.h> 35 #include <sys/wait.h> 36 #include <machine/elf.h> 37 #include <a.out.h> 38 #include <dlfcn.h> 39 #include <err.h> 40 #include <fcntl.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <unistd.h> 44 45 extern void dump_file(const char *); 46 extern int error_count; 47 48 void 49 usage(void) 50 { 51 fprintf(stderr, "usage: ldd [-v] [-f format] program ...\n"); 52 exit(1); 53 } 54 55 int 56 main(int argc, char **argv) 57 { 58 char *fmt1 = NULL, *fmt2 = NULL; 59 int rval; 60 int c; 61 int vflag = 0; 62 63 while ((c = getopt(argc, argv, "vf:")) != -1) { 64 switch (c) { 65 case 'v': 66 vflag++; 67 break; 68 case 'f': 69 if (fmt1) { 70 if (fmt2) 71 errx(1, "too many formats"); 72 fmt2 = optarg; 73 } else 74 fmt1 = optarg; 75 break; 76 default: 77 usage(); 78 /*NOTREACHED*/ 79 } 80 } 81 argc -= optind; 82 argv += optind; 83 84 if (vflag && fmt1) 85 errx(1, "-v may not be used with -f"); 86 87 if (argc <= 0) { 88 usage(); 89 /*NOTREACHED*/ 90 } 91 92 #ifdef __i386__ 93 if (vflag) { 94 for (c = 0; c < argc; c++) 95 dump_file(argv[c]); 96 exit(error_count == 0 ? EXIT_SUCCESS : EXIT_FAILURE); 97 } 98 #endif 99 100 /* ld.so magic */ 101 setenv("LD_TRACE_LOADED_OBJECTS", "1", 1); 102 if (fmt1) 103 setenv("LD_TRACE_LOADED_OBJECTS_FMT1", fmt1, 1); 104 if (fmt2) 105 setenv("LD_TRACE_LOADED_OBJECTS_FMT2", fmt2, 1); 106 107 rval = 0; 108 for ( ; argc > 0; argc--, argv++) { 109 int fd; 110 union { 111 struct exec aout; 112 Elf_Ehdr elf; 113 } hdr; 114 int n; 115 int status; 116 int file_ok; 117 int is_shlib; 118 119 if ((fd = open(*argv, O_RDONLY, 0)) < 0) { 120 warn("%s", *argv); 121 rval |= 1; 122 continue; 123 } 124 if ((n = read(fd, &hdr, sizeof hdr)) == -1) { 125 warn("%s: can't read program header", *argv); 126 (void)close(fd); 127 rval |= 1; 128 continue; 129 } 130 131 file_ok = 1; 132 is_shlib = 0; 133 if (n >= sizeof hdr.aout && !N_BADMAG(hdr.aout)) { 134 /* a.out file */ 135 if ((N_GETFLAG(hdr.aout) & EX_DPMASK) != EX_DYNAMIC 136 #if 1 /* Compatibility */ 137 || hdr.aout.a_entry < __LDPGSZ 138 #endif 139 ) { 140 warnx("%s: not a dynamic executable", *argv); 141 file_ok = 0; 142 } 143 } else if (n >= sizeof hdr.elf && IS_ELF(hdr.elf)) { 144 Elf_Ehdr ehdr; 145 Elf_Phdr phdr; 146 int dynamic = 0, i; 147 148 if (lseek(fd, 0, SEEK_SET) == -1 || 149 read(fd, &ehdr, sizeof ehdr) != sizeof ehdr || 150 lseek(fd, ehdr.e_phoff, SEEK_SET) == -1 151 ) { 152 warnx("%s: can't read program header", *argv); 153 file_ok = 0; 154 } else { 155 for (i = 0; i < ehdr.e_phnum; i++) { 156 if (read(fd, &phdr, ehdr.e_phentsize) 157 != sizeof phdr) { 158 warnx("%s: can't read program header", 159 *argv); 160 file_ok = 0; 161 break; 162 } 163 if (phdr.p_type == PT_DYNAMIC) 164 dynamic = 1; 165 } 166 } 167 if (!dynamic) { 168 warnx("%s: not a dynamic executable", *argv); 169 file_ok = 0; 170 } else if (hdr.elf.e_type == ET_DYN) { 171 is_shlib = 1; 172 } 173 } else { 174 warnx("%s: not a dynamic executable", *argv); 175 file_ok = 0; 176 } 177 (void)close(fd); 178 if (!file_ok) { 179 rval |= 1; 180 continue; 181 } 182 183 setenv("LD_TRACE_LOADED_OBJECTS_PROGNAME", *argv, 1); 184 if (fmt1 == NULL && fmt2 == NULL) 185 /* Default formats */ 186 printf("%s:\n", *argv); 187 188 fflush(stdout); 189 190 switch (fork()) { 191 case -1: 192 err(1, "fork"); 193 break; 194 default: 195 if (wait(&status) <= 0) { 196 warn("wait"); 197 rval |= 1; 198 } else if (WIFSIGNALED(status)) { 199 fprintf(stderr, "%s: signal %d\n", 200 *argv, WTERMSIG(status)); 201 rval |= 1; 202 } else if (WIFEXITED(status) && WEXITSTATUS(status)) { 203 fprintf(stderr, "%s: exit status %d\n", 204 *argv, WEXITSTATUS(status)); 205 rval |= 1; 206 } 207 break; 208 case 0: 209 if (is_shlib == 0) { 210 execl(*argv, *argv, (char *)NULL); 211 warn("%s", *argv); 212 } else { 213 dlopen(*argv, RTLD_TRACE); 214 warnx("%s: %s", *argv, dlerror()); 215 } 216 _exit(1); 217 } 218 } 219 220 return rval; 221 } 222