1 /* $OpenBSD: ktrace.c,v 1.24 2012/07/12 18:03:29 jmc 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 #include <sys/param.h> 34 #include <sys/stat.h> 35 #include <sys/time.h> 36 #include <sys/uio.h> 37 #include <sys/ktrace.h> 38 39 #include <err.h> 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <stdlib.h> 43 #include <stdio.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #include "ktrace.h" 48 #include "extern.h" 49 50 static int rpid(const char *); 51 static void no_ktrace(int); 52 static void usage(void); 53 54 int 55 main(int argc, char *argv[]) 56 { 57 enum { NOTSET, CLEAR, CLEARALL } clear; 58 int append, ch, fd, inherit, ops, pidset, trpoints; 59 pid_t pid; 60 char *tracefile; 61 mode_t omask; 62 struct stat sb; 63 64 clear = NOTSET; 65 append = ops = pidset = inherit = pid = 0; 66 trpoints = DEF_POINTS; 67 tracefile = DEF_TRACEFILE; 68 while ((ch = getopt(argc,argv,"aBCcdf:g:ip:t:")) != -1) 69 switch((char)ch) { 70 case 'a': 71 append = 1; 72 break; 73 case 'B': 74 putenv("LD_BIND_NOW="); 75 break; 76 case 'C': 77 clear = CLEARALL; 78 pidset = 1; 79 break; 80 case 'c': 81 clear = CLEAR; 82 break; 83 case 'd': 84 ops |= KTRFLAG_DESCEND; 85 break; 86 case 'f': 87 tracefile = optarg; 88 break; 89 case 'g': 90 pid = -rpid(optarg); 91 pidset = 1; 92 break; 93 case 'i': 94 inherit = 1; 95 break; 96 case 'p': 97 pid = rpid(optarg); 98 pidset = 1; 99 break; 100 case 't': 101 trpoints = getpoints(optarg); 102 if (trpoints < 0) { 103 warnx("unknown facility in %s", optarg); 104 usage(); 105 } 106 break; 107 default: 108 usage(); 109 } 110 argv += optind; 111 argc -= optind; 112 113 if ((pidset && *argv) || (!pidset && !*argv && clear != CLEAR)) 114 usage(); 115 116 if (inherit) 117 trpoints |= KTRFAC_INHERIT; 118 119 (void)signal(SIGSYS, no_ktrace); 120 if (clear != NOTSET) { 121 if (clear == CLEARALL) { 122 ops = KTROP_CLEAR | KTRFLAG_DESCEND; 123 trpoints = ALL_POINTS; 124 pid = 1; 125 } else 126 ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE; 127 128 if (ktrace(tracefile, ops, trpoints, pid) < 0) 129 err(1, "%s", tracefile); 130 exit(0); 131 } 132 133 omask = umask(S_IRWXG|S_IRWXO); 134 if (append) { 135 if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0) 136 err(1, "%s", tracefile); 137 if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) 138 errx(1, "Refuse to append to %s: not owned by you.", 139 tracefile); 140 } else { 141 if (unlink(tracefile) == -1 && errno != ENOENT) 142 err(1, "unlink %s", tracefile); 143 if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, 144 DEFFILEMODE)) < 0) 145 err(1, "%s", tracefile); 146 } 147 (void)umask(omask); 148 (void)close(fd); 149 150 if (*argv) { 151 if (ktrace(tracefile, ops, trpoints, getpid()) < 0) 152 err(1, "%s", tracefile); 153 execvp(argv[0], &argv[0]); 154 err(1, "exec of '%s' failed", argv[0]); 155 } 156 else if (ktrace(tracefile, ops, trpoints, pid) < 0) 157 err(1, "%s", tracefile); 158 exit(0); 159 } 160 161 static int 162 rpid(const char *p) 163 { 164 static int first; 165 166 if (first++) { 167 warnx("only one -g or -p flag is permitted."); 168 usage(); 169 } 170 if (!*p) { 171 warnx("illegal process id."); 172 usage(); 173 } 174 return(atoi(p)); 175 } 176 177 static void 178 usage(void) 179 { 180 (void)fprintf(stderr, 181 "usage: ktrace [-aBCcdi] [-f trfile] [-g pgid] [-p pid] [-t trstr]\n" 182 " ktrace [-adi] [-f trfile] [-t trstr] command\n"); 183 exit(1); 184 } 185 186 /* ARGSUSED */ 187 static void 188 no_ktrace(int signo) 189 { 190 char buf[8192]; 191 192 snprintf(buf, sizeof(buf), 193 "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'option KTRACE'\n"); 194 write(STDERR_FILENO, buf, strlen(buf)); 195 _exit(1); 196 } 197