/* $OpenBSD: ktrace.c,v 1.33 2016/07/18 09:36:50 guenther Exp $ */ /* $NetBSD: ktrace.c,v 1.4 1995/08/31 23:01:44 jtc Exp $ */ /*- * Copyright (c) 1988, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include /* MAXCOMLEN */ #include #include #include #include #include #include #include #include #include #include #include #include #include "ktrace.h" #include "extern.h" extern char *__progname; static int rpid(const char *); static void no_ktrace(int); static void usage(void); int is_ltrace; int main(int argc, char *argv[]) { enum { NOTSET, CLEAR, CLEARALL } clear; int append, ch, fd, inherit, ops, pidset, trpoints; pid_t pid; char *tracefile, *tracespec; mode_t omask; struct stat sb; is_ltrace = strcmp(__progname, "ltrace") == 0; clear = NOTSET; append = ops = pidset = inherit = pid = 0; trpoints = is_ltrace ? KTRFAC_USER : DEF_POINTS; tracefile = DEF_TRACEFILE; tracespec = NULL; if (is_ltrace) { while ((ch = getopt(argc, argv, "af:it:u:")) != -1) switch ((char)ch) { case 'a': append = 1; break; case 'f': tracefile = optarg; break; case 'i': inherit = 1; break; case 't': trpoints = getpoints(optarg, KTRFAC_USER); if (trpoints < 0) { warnx("unknown facility in %s", optarg); usage(); } break; case 'u': tracespec = optarg; break; default: usage(); } } else { while ((ch = getopt(argc, argv, "aBCcdf:g:ip:t:")) != -1) switch ((char)ch) { case 'a': append = 1; break; case 'B': putenv("LD_BIND_NOW="); break; case 'C': clear = CLEARALL; pidset = 1; break; case 'c': clear = CLEAR; break; case 'd': ops |= KTRFLAG_DESCEND; break; case 'f': tracefile = optarg; break; case 'g': pid = -rpid(optarg); pidset = 1; break; case 'i': inherit = 1; break; case 'p': pid = rpid(optarg); pidset = 1; break; case 't': trpoints = getpoints(optarg, DEF_POINTS); if (trpoints < 0) { warnx("unknown facility in %s", optarg); usage(); } break; default: usage(); } } argv += optind; argc -= optind; if ((pidset && *argv) || (!pidset && !*argv && clear != CLEAR)) usage(); if (inherit) trpoints |= KTRFAC_INHERIT; (void)signal(SIGSYS, no_ktrace); if (clear != NOTSET) { if (clear == CLEARALL) { ops = KTROP_CLEAR | KTRFLAG_DESCEND; trpoints = ALL_POINTS; pid = 1; } else ops |= pid ? KTROP_CLEAR : KTROP_CLEARFILE; if (ktrace(tracefile, ops, trpoints, pid) < 0) { if (errno == ESRCH) err(1, "%d", pid); err(1, "%s", tracefile); } exit(0); } omask = umask(S_IRWXG|S_IRWXO); if (append) { if ((fd = open(tracefile, O_CREAT | O_WRONLY, DEFFILEMODE)) < 0) err(1, "%s", tracefile); if (fstat(fd, &sb) != 0 || sb.st_uid != getuid()) errx(1, "Refuse to append to %s: not owned by you.", tracefile); } else { if (unlink(tracefile) == -1 && errno != ENOENT) err(1, "unlink %s", tracefile); if ((fd = open(tracefile, O_CREAT | O_EXCL | O_WRONLY, DEFFILEMODE)) < 0) err(1, "%s", tracefile); } (void)umask(omask); (void)close(fd); if (*argv) { if (is_ltrace) { if (setenv("LD_TRACE_PLT", inherit ? "i" : "", 1) < 0) err(1, "setenv(LD_TRACE_PLT)"); if (tracespec && setenv("LD_TRACE_PLTSPEC", tracespec, 1) < 0) err(1, "setenv(LD_TRACE_PLTSPEC)"); } if (ktrace(tracefile, ops, trpoints, getpid()) < 0) err(1, "%s", tracefile); execvp(argv[0], &argv[0]); err(1, "exec of '%s' failed", argv[0]); } else if (ktrace(tracefile, ops, trpoints, pid) < 0) { if (errno == ESRCH) err(1, "%d", pid); err(1, "%s", tracefile); } exit(0); } static int rpid(const char *p) { const char *errstr; static int first; pid_t pid; if (first++) { warnx("only one -g or -p flag is permitted."); usage(); } if (!*p) { warnx("illegal process id."); usage(); } pid = strtonum(p, 1, INT_MAX, &errstr); if (errstr) { warnx("illegal process id: %s", errstr); usage(); } return pid; } static void usage(void) { if (is_ltrace) fprintf(stderr, "usage: %s [-ai] [-f trfile] [-t trstr]" " [-u trspec] command\n", __progname); else fprintf(stderr, "usage: %s [-aBCcdi] [-f trfile] [-g pgid]" " [-p pid] [-t trstr]\n" " %s [-adi] [-f trfile] [-t trstr] command\n", __progname, __progname); exit(1); } /* ARGSUSED */ static void no_ktrace(int signo) { char buf[8192]; snprintf(buf, sizeof(buf), "error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'option KTRACE'\n"); write(STDERR_FILENO, buf, strlen(buf)); _exit(1); }