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 * $Id: ldd.c,v 1.16 1998/08/30 18:30:59 jdp Exp $ 31 */ 32 33 #include <sys/types.h> 34 #include <sys/stat.h> 35 #include <sys/file.h> 36 #include <sys/time.h> 37 #include <sys/resource.h> 38 #include <sys/wait.h> 39 #include <a.out.h> 40 #include <elf.h> 41 #include <err.h> 42 #include <fcntl.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 48 extern void dump_file __P((const char *)); 49 extern int error_count; 50 51 void 52 usage() 53 { 54 fprintf(stderr, "usage: ldd [-v] [-f format] program ...\n"); 55 exit(1); 56 } 57 58 int 59 main(argc, argv) 60 int argc; 61 char *argv[]; 62 { 63 char *fmt1 = NULL, *fmt2 = NULL; 64 int rval; 65 int c; 66 int vflag = 0; 67 68 while ((c = getopt(argc, argv, "vf:")) != EOF) { 69 switch (c) { 70 case 'v': 71 vflag++; 72 break; 73 case 'f': 74 if (fmt1) { 75 if (fmt2) 76 errx(1, "Too many formats"); 77 fmt2 = optarg; 78 } else 79 fmt1 = optarg; 80 break; 81 default: 82 usage(); 83 /*NOTREACHED*/ 84 } 85 } 86 argc -= optind; 87 argv += optind; 88 89 if (vflag && fmt1) 90 errx(1, "-v may not be used with -f"); 91 92 if (argc <= 0) { 93 usage(); 94 /*NOTREACHED*/ 95 } 96 97 #ifdef __i386__ 98 if (vflag) { 99 for (c = 0; c < argc; c++) 100 dump_file(argv[c]); 101 exit(error_count == 0 ? EXIT_SUCCESS : EXIT_FAILURE); 102 } 103 #endif 104 105 /* ld.so magic */ 106 setenv("LD_TRACE_LOADED_OBJECTS", "1", 1); 107 if (fmt1) 108 setenv("LD_TRACE_LOADED_OBJECTS_FMT1", fmt1, 1); 109 if (fmt2) 110 setenv("LD_TRACE_LOADED_OBJECTS_FMT2", fmt2, 1); 111 112 rval = 0; 113 for ( ; argc > 0; argc--, argv++) { 114 int fd; 115 union { 116 struct exec aout; 117 Elf_Ehdr elf; 118 } hdr; 119 int n; 120 int status; 121 int file_ok; 122 123 if ((fd = open(*argv, O_RDONLY, 0)) < 0) { 124 warn("%s", *argv); 125 rval |= 1; 126 continue; 127 } 128 if ((n = read(fd, &hdr, sizeof hdr)) == -1) { 129 warn("%s: can't read program header", *argv); 130 (void)close(fd); 131 rval |= 1; 132 continue; 133 } 134 135 file_ok = 1; 136 if (n >= sizeof hdr.aout && !N_BADMAG(hdr.aout)) { 137 /* a.out file */ 138 if ((N_GETFLAG(hdr.aout) & EX_DPMASK) != EX_DYNAMIC 139 #if 1 /* Compatibility */ 140 || hdr.aout.a_entry < __LDPGSZ 141 #endif 142 ) { 143 warnx("%s: not a dynamic executable", *argv); 144 file_ok = 0; 145 } 146 } else if (n >= sizeof hdr.elf && IS_ELF(hdr.elf)) { 147 Elf_Ehdr ehdr; 148 Elf_Phdr phdr; 149 int dynamic = 0, i; 150 151 lseek(fd, 0, SEEK_SET); 152 if (read(fd, &ehdr, sizeof ehdr) != sizeof ehdr) { 153 warnx("%s: can't read program header", *argv); 154 file_ok = 0; 155 } 156 lseek(fd, 0, ehdr.e_phoff); 157 for (i = 0; i < ehdr.e_phnum; i++) { 158 if (read(fd, &phdr, ehdr.e_phentsize) 159 != sizeof phdr) { 160 warnx("%s: can't read program header", 161 *argv); 162 file_ok = 0; 163 } 164 if (phdr.p_type == PT_DYNAMIC) 165 dynamic = 1; 166 } 167 if (!dynamic) { 168 warnx("%s: not a dynamic executable", *argv); 169 file_ok = 0; 170 } 171 } else { 172 warnx("%s: not a dynamic executable", *argv); 173 file_ok = 0; 174 } 175 (void)close(fd); 176 if (!file_ok) { 177 rval |= 1; 178 continue; 179 } 180 181 setenv("LD_TRACE_LOADED_OBJECTS_PROGNAME", *argv, 1); 182 if (fmt1 == NULL && fmt2 == NULL) 183 /* Default formats */ 184 printf("%s:\n", *argv); 185 186 fflush(stdout); 187 188 switch (fork()) { 189 case -1: 190 err(1, "fork"); 191 break; 192 default: 193 if (wait(&status) <= 0) { 194 warn("wait"); 195 rval |= 1; 196 } else if (WIFSIGNALED(status)) { 197 fprintf(stderr, "%s: signal %d\n", 198 *argv, WTERMSIG(status)); 199 rval |= 1; 200 } else if (WIFEXITED(status) && WEXITSTATUS(status)) { 201 fprintf(stderr, "%s: exit status %d\n", 202 *argv, WEXITSTATUS(status)); 203 rval |= 1; 204 } 205 break; 206 case 0: 207 rval |= execl(*argv, *argv, NULL) != 0; 208 perror(*argv); 209 _exit(1); 210 } 211 } 212 213 return rval; 214 } 215