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 */ 32 33 #include <sys/param.h> 34 #include <sys/wait.h> 35 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 [-a] [-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 aflag, vflag; 62 63 aflag = vflag = 0; 64 while ((c = getopt(argc, argv, "avf:")) != -1) { 65 switch (c) { 66 case 'a': 67 aflag++; 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 case 'v': 78 vflag++; 79 break; 80 default: 81 usage(); 82 /* NOTREACHED */ 83 } 84 } 85 argc -= optind; 86 argv += optind; 87 88 if (vflag && fmt1) 89 errx(1, "-v may not be used with -f"); 90 91 if (argc <= 0) { 92 usage(); 93 /* NOTREACHED */ 94 } 95 96 #ifdef __i386__ 97 if (vflag) { 98 for (c = 0; c < argc; c++) 99 dump_file(argv[c]); 100 exit(error_count == 0 ? EXIT_SUCCESS : EXIT_FAILURE); 101 } 102 #endif 103 104 /* ld.so magic */ 105 if (setenv("LD_TRACE_LOADED_OBJECTS", "yes", 1) == -1) 106 err(1, "setenv: cannot set LD_TRACE_LOADED_OBJECTS=1"); 107 if (fmt1) { 108 if (setenv("LD_TRACE_LOADED_OBJECTS_FMT1", fmt1, 1) == -1) 109 err(1, "setenv: cannot set LD_TRACE_LOADED_OBJECTS_FMT1=%s", fmt1); 110 } 111 if (fmt2) { 112 if (setenv("LD_TRACE_LOADED_OBJECTS_FMT2", fmt2, 1) == -1) 113 err(1, "setenv: cannot set LD_TRACE_LOADED_OBJECTS_FMT2=%s", fmt2); 114 } 115 116 rval = 0; 117 for ( ; argc > 0; argc--, argv++) { 118 int fd; 119 union { 120 struct exec aout; 121 Elf_Ehdr elf; 122 } hdr; 123 int n; 124 int status; 125 int file_ok; 126 int is_shlib; 127 128 if ((fd = open(*argv, O_RDONLY, 0)) < 0) { 129 warn("%s", *argv); 130 rval |= 1; 131 continue; 132 } 133 if ((n = read(fd, &hdr, sizeof hdr)) == -1) { 134 warn("%s: can't read program header", *argv); 135 (void)close(fd); 136 rval |= 1; 137 continue; 138 } 139 140 file_ok = 1; 141 is_shlib = 0; 142 if (n >= sizeof hdr.aout && !N_BADMAG(hdr.aout)) { 143 /* a.out file */ 144 if ((N_GETFLAG(hdr.aout) & EX_DPMASK) != EX_DYNAMIC 145 #if 1 /* Compatibility */ 146 || hdr.aout.a_entry < __LDPGSZ 147 #endif 148 ) { 149 warnx("%s: not a dynamic executable", *argv); 150 file_ok = 0; 151 } 152 } else if (n >= sizeof hdr.elf && IS_ELF(hdr.elf)) { 153 Elf_Ehdr ehdr; 154 Elf_Phdr phdr; 155 int dynamic = 0, i; 156 157 if (lseek(fd, 0, SEEK_SET) == -1 || 158 read(fd, &ehdr, sizeof ehdr) != sizeof ehdr || 159 lseek(fd, ehdr.e_phoff, SEEK_SET) == -1 160 ) { 161 warnx("%s: can't read program header", *argv); 162 file_ok = 0; 163 } else { 164 for (i = 0; i < ehdr.e_phnum; i++) { 165 if (read(fd, &phdr, ehdr.e_phentsize) 166 != sizeof phdr) { 167 warnx("%s: can't read program header", 168 *argv); 169 file_ok = 0; 170 break; 171 } 172 if (phdr.p_type == PT_DYNAMIC) 173 dynamic = 1; 174 } 175 } 176 if (!dynamic) { 177 warnx("%s: not a dynamic executable", *argv); 178 file_ok = 0; 179 } else if (hdr.elf.e_type == ET_DYN) { 180 is_shlib = 1; 181 } 182 } else { 183 warnx("%s: not a dynamic executable", *argv); 184 file_ok = 0; 185 } 186 (void)close(fd); 187 if (!file_ok) { 188 rval |= 1; 189 continue; 190 } 191 192 if (setenv("LD_TRACE_LOADED_OBJECTS_PROGNAME", *argv, 1) == -1) 193 err(1, "setenv: cannot set LD_TRACE_LOADED_OBJECTS_PROGNAME=%s", *argv); 194 if (aflag) setenv("LD_TRACE_LOADED_OBJECTS_ALL", "1", 1); 195 else if (fmt1 == NULL && fmt2 == NULL) 196 /* Default formats */ 197 printf("%s:\n", *argv); 198 fflush(stdout); 199 200 switch (fork()) { 201 case -1: 202 err(1, "fork"); 203 break; 204 default: 205 if (wait(&status) <= 0) { 206 warn("wait"); 207 rval |= 1; 208 } else if (WIFSIGNALED(status)) { 209 fprintf(stderr, "%s: signal %d\n", 210 *argv, WTERMSIG(status)); 211 rval |= 1; 212 } else if (WIFEXITED(status) && WEXITSTATUS(status)) { 213 fprintf(stderr, "%s: exit status %d\n", 214 *argv, WEXITSTATUS(status)); 215 rval |= 1; 216 } 217 break; 218 case 0: 219 if (is_shlib == 0) { 220 execl(*argv, *argv, NULL); 221 warn("%s", *argv); 222 } else { 223 dlopen(*argv, RTLD_TRACE); 224 warnx("%s: %s", *argv, dlerror()); 225 } 226 _exit(1); 227 } 228 } 229 230 return rval; 231 } 232