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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/ktrace/ktrace.c	Lines:	31	101	30.7 %
Date:	2017-11-07	Branches:	20	83	24.1 %


/*	$OpenBSD: ktrace.c,v 1.34 2017/06/11 17:32:19 awolk 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 <sys/param.h>	/* MAXCOMLEN */
#include <sys/signal.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/ktrace.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#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)
{
	dprintf(STDERR_FILENO,
"error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'option KTRACE'\n");
	_exit(1);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: ktrace.c,v 1.34 2017/06/11 17:32:19 awolk 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> /* MAXCOMLEN */
34			#include <sys/signal.h>
35			#include <sys/stat.h>
36			#include <sys/time.h>
37			#include <sys/uio.h>
38			#include <sys/ktrace.h>
39
40			#include <err.h>
41			#include <errno.h>
42			#include <fcntl.h>
43			#include <stdlib.h>
44			#include <stdio.h>
45			#include <string.h>
46			#include <unistd.h>
47
48			#include "ktrace.h"
49			#include "extern.h"
50
51			extern char *__progname;
52
53			static int rpid(const char *);
54			static void no_ktrace(int);
55			static void usage(void);
56
57			int is_ltrace;
58
59			int
60			main(int argc, char *argv[])
61			{
62			enum { NOTSET, CLEAR, CLEARALL } clear;
63			int append, ch, fd, inherit, ops, pidset, trpoints;
64			pid_t pid;
65			char tracefile, tracespec;
66			mode_t omask;
67		420	struct stat sb;
68
69		210	is_ltrace = strcmp(__progname, "ltrace") == 0;
70
71			clear = NOTSET;
72			append = ops = pidset = inherit = pid = 0;
73		210	trpoints = is_ltrace ? KTRFAC_USER : DEF_POINTS;
74			tracefile = DEF_TRACEFILE;
75			tracespec = NULL;
76
77	✗✓	210	if (is_ltrace) {
78			while ((ch = getopt(argc, argv, "af:it:u:")) != -1)
79			switch ((char)ch) {
80			case 'a':
81			append = 1;
82			break;
83			case 'f':
84			tracefile = optarg;
85			break;
86			case 'i':
87			inherit = 1;
88			break;
89			case 't':
90			trpoints = getpoints(optarg, KTRFAC_USER);
91			if (trpoints < 0) {
92			warnx("unknown facility in %s", optarg);
93			usage();
94			}
95			break;
96			case 'u':
97			tracespec = optarg;
98			break;
99			default:
100			usage();
101			}
102			} else {
103	✓✓	630	while ((ch = getopt(argc, argv, "aBCcdf:g:ip:t:")) != -1)
104	✗✗✗✗ ✗✓✗✗ ✓✗✗	420	switch ((char)ch) {
105			case 'a':
106			append = 1;
107			break;
108			case 'B':
109			putenv("LD_BIND_NOW=");
110			break;
111			case 'C':
112			clear = CLEARALL;
113			pidset = 1;
114			break;
115			case 'c':
116			clear = CLEAR;
117			break;
118			case 'd':
119			ops \|= KTRFLAG_DESCEND;
120			break;
121			case 'f':
122		210	tracefile = optarg;
123		210	break;
124			case 'g':
125			pid = -rpid(optarg);
126			pidset = 1;
127			break;
128			case 'i':
129			inherit = 1;
130			break;
131			case 'p':
132		210	pid = rpid(optarg);
133			pidset = 1;
134		210	break;
135			case 't':
136			trpoints = getpoints(optarg, DEF_POINTS);
137			if (trpoints < 0) {
138			warnx("unknown facility in %s", optarg);
139			usage();
140			}
141			break;
142			default:
143			usage();
144			}
145			}
146
147		210	argv += optind;
148			argc -= optind;
149
150	✓✗✓✗ ✗✓✗✗	630	if ((pidset && argv) \|\| (!pidset && !argv && clear != CLEAR))
151			usage();
152
153	✗✓	210	if (inherit)
154			trpoints \|= KTRFAC_INHERIT;
155
156		210	(void)signal(SIGSYS, no_ktrace);
157	✗✓	210	if (clear != NOTSET) {
158			if (clear == CLEARALL) {
159			ops = KTROP_CLEAR \| KTRFLAG_DESCEND;
160			trpoints = ALL_POINTS;
161			pid = 1;
162			} else
163			ops \|= pid ? KTROP_CLEAR : KTROP_CLEARFILE;
164
165			if (ktrace(tracefile, ops, trpoints, pid) < 0) {
166			if (errno == ESRCH)
167			err(1, "%d", pid);
168			err(1, "%s", tracefile);
169			}
170			exit(0);
171			}
172
173		210	omask = umask(S_IRWXG\|S_IRWXO);
174	✗✓	210	if (append) {
175			if ((fd = open(tracefile, O_CREAT \| O_WRONLY, DEFFILEMODE)) < 0)
176			err(1, "%s", tracefile);
177			if (fstat(fd, &sb) != 0 \|\| sb.st_uid != getuid())
178			errx(1, "Refuse to append to %s: not owned by you.",
179			tracefile);
180			} else {
181	✓✓✗✓	220	if (unlink(tracefile) == -1 && errno != ENOENT)
182			err(1, "unlink %s", tracefile);
183	✗✓	420	if ((fd = open(tracefile, O_CREAT \| O_EXCL \| O_WRONLY,
184		210	DEFFILEMODE)) < 0)
185			err(1, "%s", tracefile);
186			}
187		210	(void)umask(omask);
188		210	(void)close(fd);
189
190	✗✓	210	if (*argv) {
191			if (is_ltrace) {
192			if (setenv("LD_TRACE_PLT", inherit ? "i" : "", 1) < 0)
193			err(1, "setenv(LD_TRACE_PLT)");
194			if (tracespec &&
195			setenv("LD_TRACE_PLTSPEC", tracespec, 1) < 0)
196			err(1, "setenv(LD_TRACE_PLTSPEC)");
197			}
198			if (ktrace(tracefile, ops, trpoints, getpid()) < 0)
199			err(1, "%s", tracefile);
200			execvp(argv[0], &argv[0]);
201			err(1, "exec of '%s' failed", argv[0]);
202			}
203	✗✓	210	else if (ktrace(tracefile, ops, trpoints, pid) < 0) {
204			if (errno == ESRCH)
205			err(1, "%d", pid);
206			err(1, "%s", tracefile);
207			}
208			exit(0);
209			}
210
211			static int
212			rpid(const char *p)
213			{
214		420	const char *errstr;
215			static int first;
216			pid_t pid;
217
218	✗✓	210	if (first++) {
219			warnx("only one -g or -p flag is permitted.");
220			usage();
221			}
222	✗✓	210	if (!*p) {
223			warnx("illegal process id.");
224			usage();
225			}
226		210	pid = strtonum(p, 1, INT_MAX, &errstr);
227	✗✓	210	if (errstr) {
228			warnx("illegal process id: %s", errstr);
229			usage();
230			}
231		210	return pid;
232		210	}
233
234			static void
235			usage(void)
236			{
237			if (is_ltrace)
238			fprintf(stderr, "usage: %s [-ai] [-f trfile] [-t trstr]"
239			" [-u trspec] command\n",
240			__progname);
241			else
242			fprintf(stderr, "usage: %s [-aBCcdi] [-f trfile] [-g pgid]"
243			" [-p pid] [-t trstr]\n"
244			" %s [-adi] [-f trfile] [-t trstr] command\n",
245			__progname, __progname);
246			exit(1);
247			}
248
249			/* ARGSUSED */
250			static void
251			no_ktrace(int signo)
252			{
253			dprintf(STDERR_FILENO,
254			"error:\tktrace() system call not supported in the running kernel\n\tre-compile kernel with 'option KTRACE'\n");
255			_exit(1);
256			}