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 31 #ifndef lint 32 static const char rcsid[] = 33 "$FreeBSD$"; 34 #endif /* not lint */ 35 36 #include <sys/wait.h> 37 #include <machine/elf.h> 38 #include <a.out.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 __P((const char *)); 46 extern int error_count; 47 48 void 49 usage() 50 { 51 fprintf(stderr, "usage: ldd [-v] [-f format] program ...\n"); 52 exit(1); 53 } 54 55 int 56 main(argc, argv) 57 int argc; 58 char *argv[]; 59 { 60 char *fmt1 = NULL, *fmt2 = NULL; 61 int rval; 62 int c; 63 int vflag = 0; 64 65 while ((c = getopt(argc, argv, "vf:")) != -1) { 66 switch (c) { 67 case 'v': 68 vflag++; 69 break; 70 case 'f': 71 if (fmt1) { 72 if (fmt2) 73 errx(1, "too many formats"); 74 fmt2 = optarg; 75 } else 76 fmt1 = optarg; 77 break; 78 default: 79 usage(); 80 /*NOTREACHED*/ 81 } 82 } 83 argc -= optind; 84 argv += optind; 85 86 if (vflag && fmt1) 87 errx(1, "-v may not be used with -f"); 88 89 if (argc <= 0) { 90 usage(); 91 /*NOTREACHED*/ 92 } 93 94 #ifdef __i386__ 95 if (vflag) { 96 for (c = 0; c < argc; c++) 97 dump_file(argv[c]); 98 exit(error_count == 0 ? EXIT_SUCCESS : EXIT_FAILURE); 99 } 100 #endif 101 102 /* ld.so magic */ 103 setenv("LD_TRACE_LOADED_OBJECTS", "1", 1); 104 if (fmt1) 105 setenv("LD_TRACE_LOADED_OBJECTS_FMT1", fmt1, 1); 106 if (fmt2) 107 setenv("LD_TRACE_LOADED_OBJECTS_FMT2", fmt2, 1); 108 109 rval = 0; 110 for ( ; argc > 0; argc--, argv++) { 111 int fd; 112 union { 113 struct exec aout; 114 Elf_Ehdr elf; 115 } hdr; 116 int n; 117 int status; 118 int file_ok; 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 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 } 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 warn("%s", *argv); 209 _exit(1); 210 } 211 } 212 213 return rval; 214 } 215