1 /*- 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. 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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1988, 1993\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #if 0 37 #ifndef lint 38 static char sccsid[] = "@(#)ktrace.c 8.1 (Berkeley) 6/6/93"; 39 #endif /* not lint */ 40 #endif 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <sys/param.h> 46 #include <sys/stat.h> 47 #include <sys/file.h> 48 #include <sys/time.h> 49 #include <sys/errno.h> 50 #include <sys/uio.h> 51 #include <sys/ktrace.h> 52 53 #include <err.h> 54 #include <stdlib.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <unistd.h> 58 59 #include "ktrace.h" 60 61 static char def_tracefile[] = DEF_TRACEFILE; 62 63 static void no_ktrace(int); 64 static int rpid(char *); 65 static void usage(void); 66 67 int 68 main(int argc, char *argv[]) 69 { 70 enum { NOTSET, CLEAR, CLEARALL } clear; 71 int append, ch, fd, inherit, ops, pid, pidset, trpoints; 72 const char *tracefile; 73 mode_t omask; 74 struct stat sb; 75 76 clear = NOTSET; 77 append = ops = pidset = inherit = 0; 78 trpoints = DEF_POINTS; 79 tracefile = def_tracefile; 80 while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1) 81 switch((char)ch) { 82 case 'a': 83 append = 1; 84 break; 85 case 'C': 86 clear = CLEARALL; 87 pidset = 1; 88 break; 89 case 'c': 90 clear = CLEAR; 91 break; 92 case 'd': 93 ops |= KTRFLAG_DESCEND; 94 break; 95 case 'f': 96 tracefile = optarg; 97 break; 98 case 'g': 99 pid = -rpid(optarg); 100 pidset = 1; 101 break; 102 case 'i': 103 inherit = 1; 104 break; 105 case 'p': 106 pid = rpid(optarg); 107 pidset = 1; 108 break; 109 case 't': 110 trpoints = getpoints(optarg); 111 if (trpoints < 0) { 112 warnx("unknown facility in %s", optarg); 113 usage(); 114 } 115 break; 116 default: 117 usage(); 118 } 119 argv += optind; 120 argc -= optind; 121 122 if ((pidset && *argv) || (!pidset && clear == NOTSET && !*argv)) 123 usage(); 124 125 if (inherit) 126 trpoints |= KTRFAC_INHERIT; 127 128 (void)signal(SIGSYS, no_ktrace); 129 if (clear != NOTSET) { 130 if (clear == CLEARALL) { 131 ops = KTROP_CLEAR | KTRFLAG_DESCEND; 132 trpoints = ALL_POINTS; 133 pid = 1; 134 } else 135 ops |= pidset ? KTROP_CLEAR : KTROP_CLEARFILE; 136 137 if (ktrace(tracefile, ops, trpoints, pid) < 0) 138 err(1, "%s", tracefile); 139 exit(0); 140 } 141 142 omask = umask(S_IRWXG|S_IRWXO); 143 if (append) { 144 if ((fd = open(tracefile, O_CREAT | O_WRONLY | O_NONBLOCK, 145 DEFFILEMODE)) < 0) 146 err(1, "%s", tracefile); 147 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) 148 errx(1, "refuse to append to %s not owned by you", 149 tracefile); 150 if (!(S_ISREG(sb.st_mode))) 151 errx(1, "%s not regular file", tracefile); 152 } else { 153 if (unlink(tracefile) == -1 && errno != ENOENT) 154 err(1, "unlink %s", tracefile); 155 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 156 DEFFILEMODE)) < 0) 157 err(1, "%s", tracefile); 158 } 159 (void)umask(omask); 160 (void)close(fd); 161 162 trpoints |= PROC_ABI_POINTS; 163 164 if (*argv) { 165 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 166 err(1, "%s", tracefile); 167 execvp(argv[0], &argv[0]); 168 err(1, "exec of '%s' failed", argv[0]); 169 } 170 else if (ktrace(tracefile, ops, trpoints, pid) < 0) 171 err(1, "%s", tracefile); 172 exit(0); 173 } 174 175 static int 176 rpid(char *p) 177 { 178 static int first; 179 180 if (first++) { 181 warnx("only one -g or -p flag is permitted"); 182 usage(); 183 } 184 if (!*p) { 185 warnx("illegal process id"); 186 usage(); 187 } 188 return(atoi(p)); 189 } 190 191 static void 192 usage(void) 193 { 194 (void)fprintf(stderr, "%s\n%s\n", 195 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t trstr]", 196 " ktrace [-adi] [-f trfile] [-t trstr] command"); 197 exit(1); 198 } 199 200 static void 201 no_ktrace(int sig __unused) 202 { 203 (void)fprintf(stderr, 204 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n"); 205 exit(1); 206 } 207