1 /* $OpenBSD: ktrace.c,v 1.21 2009/02/23 01:41:14 tedu Exp $ */ 2 /* $NetBSD: ktrace.c,v 1.4 1995/08/31 23:01:44 jtc Exp $ */ 3 4 /*- 5 * Copyright (c) 1988, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 static char copyright[] = 35 "@(#) Copyright (c) 1988, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)ktrace.c 8.2 (Berkeley) 4/28/95"; 42 #endif 43 static char *rcsid = "$OpenBSD: ktrace.c,v 1.21 2009/02/23 01:41:14 tedu Exp $"; 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/stat.h> 48 #include <sys/time.h> 49 #include <sys/uio.h> 50 #include <sys/ktrace.h> 51 52 #include <err.h> 53 #include <errno.h> 54 #include <fcntl.h> 55 #include <stdlib.h> 56 #include <stdio.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #include "ktrace.h" 61 #include "extern.h" 62 63 static int rpid(const char *); 64 static void no_ktrace(int); 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, pidset, trpoints; 72 pid_t pid; 73 char *tracefile; 74 mode_t omask; 75 struct stat sb; 76 77 clear = NOTSET; 78 append = ops = pidset = inherit = pid = 0; 79 trpoints = DEF_POINTS; 80 tracefile = DEF_TRACEFILE; 81 while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1) 82 switch((char)ch) { 83 case 'a': 84 append = 1; 85 break; 86 case 'C': 87 clear = CLEARALL; 88 pidset = 1; 89 break; 90 case 'c': 91 clear = CLEAR; 92 break; 93 case 'd': 94 ops |= KTRFLAG_DESCEND; 95 break; 96 case 'f': 97 tracefile = optarg; 98 break; 99 case 'g': 100 pid = -rpid(optarg); 101 pidset = 1; 102 break; 103 case 'i': 104 inherit = 1; 105 break; 106 case 'p': 107 pid = rpid(optarg); 108 pidset = 1; 109 break; 110 case 't': 111 trpoints = getpoints(optarg); 112 if (trpoints < 0) { 113 warnx("unknown facility in %s", optarg); 114 usage(); 115 } 116 break; 117 default: 118 usage(); 119 } 120 argv += optind; 121 argc -= optind; 122 123 if ((pidset && *argv) || (!pidset && !*argv && clear != CLEAR)) 124 usage(); 125 126 if (inherit) 127 trpoints |= KTRFAC_INHERIT; 128 129 (void)signal(SIGSYS, no_ktrace); 130 if (clear != NOTSET) { 131 if (clear == CLEARALL) { 132 ops = KTROP_CLEAR | KTRFLAG_DESCEND; 133 trpoints = ALL_POINTS; 134 pid = 1; 135 } else 136 ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE; 137 138 if (ktrace(tracefile, ops, trpoints, pid) < 0) 139 err(1, "%s", tracefile); 140 exit(0); 141 } 142 143 omask = umask(S_IRWXG|S_IRWXO); 144 if (append) { 145 if ((fd = open(tracefile, O_CREAT | O_WRONLY, 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 } else { 151 if (unlink(tracefile) == -1 && errno != ENOENT) 152 err(1, "unlink %s", tracefile); 153 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 154 DEFFILEMODE)) < 0) 155 err(1, "%s", tracefile); 156 } 157 (void)umask(omask); 158 (void)close(fd); 159 160 if (*argv) { 161 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 162 err(1, "%s", tracefile); 163 execvp(argv[0], &argv[0]); 164 err(1, "exec of '%s' failed", argv[0]); 165 } 166 else if (ktrace(tracefile, ops, trpoints, pid) < 0) 167 err(1, "%s", tracefile); 168 exit(0); 169 } 170 171 static int 172 rpid(const char *p) 173 { 174 static int first; 175 176 if (first++) { 177 warnx("only one -g or -p flag is permitted."); 178 usage(); 179 } 180 if (!*p) { 181 warnx("illegal process id."); 182 usage(); 183 } 184 return(atoi(p)); 185 } 186 187 static void 188 usage(void) 189 { 190 (void)fprintf(stderr, 191 "usage: ktrace [-aCcdi] [-f trfile] [-g pgid] [-p pid] [-t trstr]\n" 192 " ktrace [-adi] [-f trfile] [-t trstr] command\n"); 193 exit(1); 194 } 195 196 /* ARGSUSED */ 197 static void 198 no_ktrace(int signo) 199 { 200 char buf[8192]; 201 202 snprintf(buf, sizeof(buf), 203 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'option KTRACE'\n"); 204 write(STDERR_FILENO, buf, strlen(buf)); 205 _exit(1); 206 } 207