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 <stdio.h> 55 #include <stdlib.h> 56 #include <unistd.h> 57 58 #include "ktrace.h" 59 60 static char def_tracefile[] = DEF_TRACEFILE; 61 62 static void no_ktrace(int); 63 static int rpid(char *); 64 static void usage(void); 65 66 int 67 main(int argc, char *argv[]) 68 { 69 enum { NOTSET, CLEAR, CLEARALL } clear; 70 int append, ch, fd, inherit, ops, pid, pidset, trpoints; 71 const char *tracefile; 72 mode_t omask; 73 struct stat sb; 74 75 clear = NOTSET; 76 append = ops = pidset = inherit = 0; 77 trpoints = DEF_POINTS; 78 tracefile = def_tracefile; 79 while ((ch = getopt(argc,argv,"aCcdf:g:ip:t:")) != -1) 80 switch((char)ch) { 81 case 'a': 82 append = 1; 83 break; 84 case 'C': 85 clear = CLEARALL; 86 pidset = 1; 87 break; 88 case 'c': 89 clear = CLEAR; 90 break; 91 case 'd': 92 ops |= KTRFLAG_DESCEND; 93 break; 94 case 'f': 95 tracefile = optarg; 96 break; 97 case 'g': 98 pid = -rpid(optarg); 99 pidset = 1; 100 break; 101 case 'i': 102 inherit = 1; 103 break; 104 case 'p': 105 pid = rpid(optarg); 106 pidset = 1; 107 break; 108 case 't': 109 trpoints = getpoints(optarg); 110 if (trpoints < 0) { 111 warnx("unknown facility in %s", optarg); 112 usage(); 113 } 114 break; 115 default: 116 usage(); 117 } 118 argv += optind; 119 argc -= optind; 120 121 if ((pidset && *argv) || (!pidset && clear == NOTSET && !*argv)) 122 usage(); 123 124 if (inherit) 125 trpoints |= KTRFAC_INHERIT; 126 127 (void)signal(SIGSYS, no_ktrace); 128 if (clear != NOTSET) { 129 if (clear == CLEARALL) { 130 ops = KTROP_CLEAR | KTRFLAG_DESCEND; 131 trpoints = ALL_POINTS; 132 pid = 1; 133 } else 134 ops |= pidset ? KTROP_CLEAR : KTROP_CLEARFILE; 135 136 if (ktrace(tracefile, ops, trpoints, pid) < 0) 137 err(1, "%s", tracefile); 138 exit(0); 139 } 140 141 omask = umask(S_IRWXG|S_IRWXO); 142 if (append) { 143 if ((fd = open(tracefile, O_CREAT | O_WRONLY | O_NONBLOCK, 144 DEFFILEMODE)) < 0) 145 err(1, "%s", tracefile); 146 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) 147 errx(1, "refuse to append to %s not owned by you", 148 tracefile); 149 if (!(S_ISREG(sb.st_mode))) 150 errx(1, "%s not regular file", tracefile); 151 } else { 152 if (unlink(tracefile) == -1 && errno != ENOENT) 153 err(1, "unlink %s", tracefile); 154 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 155 DEFFILEMODE)) < 0) 156 err(1, "%s", tracefile); 157 } 158 (void)umask(omask); 159 (void)close(fd); 160 161 trpoints |= PROC_ABI_POINTS; 162 163 if (*argv) { 164 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 165 err(1, "%s", tracefile); 166 execvp(argv[0], &argv[0]); 167 err(1, "exec of '%s' failed", argv[0]); 168 } 169 else if (ktrace(tracefile, ops, trpoints, pid) < 0) 170 err(1, "%s", tracefile); 171 exit(0); 172 } 173 174 static int 175 rpid(char *p) 176 { 177 static int first; 178 179 if (first++) { 180 warnx("only one -g or -p flag is permitted"); 181 usage(); 182 } 183 if (!*p) { 184 warnx("illegal process id"); 185 usage(); 186 } 187 return(atoi(p)); 188 } 189 190 static void 191 usage(void) 192 { 193 (void)fprintf(stderr, "%s\n%s\n", 194 "usage: ktrace [-aCcdi] [-f trfile] [-g pgrp | -p pid] [-t trstr]", 195 " ktrace [-adi] [-f trfile] [-t trstr] command"); 196 exit(1); 197 } 198 199 static void 200 no_ktrace(int sig __unused) 201 { 202 (void)fprintf(stderr, 203 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'options KTRACE'\n"); 204 exit(1); 205 } 206