Head

GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libevent/event_tagging.c	Lines:	94	174	54.0 %
Date:	2017-11-13	Branches:	41	90	45.6 %


/*	$OpenBSD: event_tagging.c,v 1.10 2014/10/30 16:45:37 bluhm Exp $	*/

/*
 * Copyright (c) 2003, 2004 Niels Provos <provos@citi.umich.edu>
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/types.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/time.h>

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>

#include "event.h"
#include "log.h"

int evtag_decode_int(ev_uint32_t *pnumber, struct evbuffer *evbuf);
int evtag_encode_tag(struct evbuffer *evbuf, ev_uint32_t tag);
int evtag_decode_tag(ev_uint32_t *ptag, struct evbuffer *evbuf);

static struct evbuffer *_buf;	/* not thread safe */

void
evtag_init(void)
{
	if (_buf != NULL)
		return;

	if ((_buf = evbuffer_new()) == NULL)
		event_err(1, "%s: malloc", __func__);
}

/*
 * We encode integer's by nibbles; the first nibble contains the number
 * of significant nibbles - 1;  this allows us to encode up to 64-bit
 * integers.  This function is byte-order independent.
 */

void
encode_int(struct evbuffer *evbuf, ev_uint32_t number)
{
	int off = 1, nibbles = 0;
	ev_uint8_t data[5];

	memset(data, 0, sizeof(ev_uint32_t)+1);
	while (number) {
		if (off & 0x1)
			data[off/2] = (data[off/2] & 0xf0) | (number & 0x0f);
		else
			data[off/2] = (data[off/2] & 0x0f) |
			    ((number & 0x0f) << 4);
		number >>= 4;
		off++;
	}

	if (off > 2)
		nibbles = off - 2;

	/* Off - 1 is the number of encoded nibbles */
	data[0] = (data[0] & 0x0f) | ((nibbles & 0x0f) << 4);

	evbuffer_add(evbuf, data, (off + 1) / 2);
}

/*
 * Support variable length encoding of tags; we use the high bit in each
 * octet as a continuation signal.
 */

int
evtag_encode_tag(struct evbuffer *evbuf, ev_uint32_t tag)
{
	int bytes = 0;
	ev_uint8_t data[5];

	memset(data, 0, sizeof(data));
	do {
		ev_uint8_t lower = tag & 0x7f;
		tag >>= 7;

		if (tag)
			lower |= 0x80;

		data[bytes++] = lower;
	} while (tag);

	if (evbuf != NULL)
		evbuffer_add(evbuf, data, bytes);

	return (bytes);
}

static int
decode_tag_internal(ev_uint32_t *ptag, struct evbuffer *evbuf, int dodrain)
{
	ev_uint32_t number = 0;
	ev_uint8_t *data = EVBUFFER_DATA(evbuf);
	int len = EVBUFFER_LENGTH(evbuf);
	int count = 0, shift = 0, done = 0;

	while (count++ < len) {
		ev_uint8_t lower = *data++;
		number |= (lower & 0x7f) << shift;
		shift += 7;

		if (!(lower & 0x80)) {
			done = 1;
			break;
		}
	}

	if (!done)
		return (-1);

	if (dodrain)
		evbuffer_drain(evbuf, count);

	if (ptag != NULL)
		*ptag = number;

	return (count);
}

int
evtag_decode_tag(ev_uint32_t *ptag, struct evbuffer *evbuf)
{
	return (decode_tag_internal(ptag, evbuf, 1 /* dodrain */));
}

/*
 * Marshal a data type, the general format is as follows:
 *
 * tag number: one byte; length: var bytes; payload: var bytes
 */

void
evtag_marshal(struct evbuffer *evbuf, ev_uint32_t tag,
    const void *data, ev_uint32_t len)
{
	evtag_encode_tag(evbuf, tag);
	encode_int(evbuf, len);
	evbuffer_add(evbuf, data, len);
}

/* Marshaling for integers */
void
evtag_marshal_int(struct evbuffer *evbuf, ev_uint32_t tag, ev_uint32_t integer)
{
	evbuffer_drain(_buf, EVBUFFER_LENGTH(_buf));
	encode_int(_buf, integer);

	evtag_encode_tag(evbuf, tag);
	encode_int(evbuf, EVBUFFER_LENGTH(_buf));
	evbuffer_add_buffer(evbuf, _buf);
}

void
evtag_marshal_string(struct evbuffer *buf, ev_uint32_t tag, const char *string)
{
	evtag_marshal(buf, tag, string, strlen(string));
}

void
evtag_marshal_timeval(struct evbuffer *evbuf, ev_uint32_t tag, struct timeval *tv)
{
	evbuffer_drain(_buf, EVBUFFER_LENGTH(_buf));

	encode_int(_buf, tv->tv_sec);		/* XXX 2038 */
	encode_int(_buf, tv->tv_usec);

	evtag_marshal(evbuf, tag, EVBUFFER_DATA(_buf),
	    EVBUFFER_LENGTH(_buf));
}

static int
decode_int_internal(ev_uint32_t *pnumber, struct evbuffer *evbuf, int dodrain)
{
	ev_uint32_t number = 0;
	ev_uint8_t *data = EVBUFFER_DATA(evbuf);
	int len = EVBUFFER_LENGTH(evbuf);
	int nibbles = 0;

	if (!len)
		return (-1);

	nibbles = ((data[0] & 0xf0) >> 4) + 1;
	if (nibbles > 8 || (nibbles >> 1) + 1 > len)
		return (-1);
	len = (nibbles >> 1) + 1;

	while (nibbles > 0) {
		number <<= 4;
		if (nibbles & 0x1)
			number |= data[nibbles >> 1] & 0x0f;
		else
			number |= (data[nibbles >> 1] & 0xf0) >> 4;
		nibbles--;
	}

	if (dodrain)
		evbuffer_drain(evbuf, len);

	*pnumber = number;

	return (len);
}

int
evtag_decode_int(ev_uint32_t *pnumber, struct evbuffer *evbuf)
{
	return (decode_int_internal(pnumber, evbuf, 1) == -1 ? -1 : 0);
}

int
evtag_peek(struct evbuffer *evbuf, ev_uint32_t *ptag)
{
	return (decode_tag_internal(ptag, evbuf, 0 /* dodrain */));
}

int
evtag_peek_length(struct evbuffer *evbuf, ev_uint32_t *plength)
{
	struct evbuffer tmp;
	int res, len;

	len = decode_tag_internal(NULL, evbuf, 0 /* dodrain */);
	if (len == -1)
		return (-1);

	tmp = *evbuf;
	tmp.buffer += len;
	tmp.off -= len;

	res = decode_int_internal(plength, &tmp, 0);
	if (res == -1)
		return (-1);

	*plength += res + len;

	return (0);
}

int
evtag_payload_length(struct evbuffer *evbuf, ev_uint32_t *plength)
{
	struct evbuffer tmp;
	int res, len;

	len = decode_tag_internal(NULL, evbuf, 0 /* dodrain */);
	if (len == -1)
		return (-1);

	tmp = *evbuf;
	tmp.buffer += len;
	tmp.off -= len;

	res = decode_int_internal(plength, &tmp, 0);
	if (res == -1)
		return (-1);

	return (0);
}

int
evtag_consume(struct evbuffer *evbuf)
{
	ev_uint32_t len;
	if (decode_tag_internal(NULL, evbuf, 1 /* dodrain */) == -1)
		return (-1);
	if (evtag_decode_int(&len, evbuf) == -1)
		return (-1);
	evbuffer_drain(evbuf, len);

	return (0);
}

/* Reads the data type from an event buffer */

int
evtag_unmarshal(struct evbuffer *src, ev_uint32_t *ptag, struct evbuffer *dst)
{
	ev_uint32_t len;
	ev_uint32_t integer;

	if (decode_tag_internal(ptag, src, 1 /* dodrain */) == -1)
		return (-1);
	if (evtag_decode_int(&integer, src) == -1)
		return (-1);
	len = integer;

	if (EVBUFFER_LENGTH(src) < len)
		return (-1);

	if (evbuffer_add(dst, EVBUFFER_DATA(src), len) == -1)
		return (-1);

	evbuffer_drain(src, len);

	return (len);
}

/* Marshaling for integers */

int
evtag_unmarshal_int(struct evbuffer *evbuf, ev_uint32_t need_tag,
    ev_uint32_t *pinteger)
{
	ev_uint32_t tag;
	ev_uint32_t len;
	ev_uint32_t integer;

	if (decode_tag_internal(&tag, evbuf, 1 /* dodrain */) == -1)
		return (-1);
	if (need_tag != tag)
		return (-1);
	if (evtag_decode_int(&integer, evbuf) == -1)
		return (-1);
	len = integer;

	if (EVBUFFER_LENGTH(evbuf) < len)
		return (-1);

	evbuffer_drain(_buf, EVBUFFER_LENGTH(_buf));
	if (evbuffer_add(_buf, EVBUFFER_DATA(evbuf), len) == -1)
		return (-1);

	evbuffer_drain(evbuf, len);

	return (evtag_decode_int(pinteger, _buf));
}

/* Unmarshal a fixed length tag */

int
evtag_unmarshal_fixed(struct evbuffer *src, ev_uint32_t need_tag, void *data,
    size_t len)
{
	ev_uint32_t tag;

	/* Initialize this event buffer so that we can read into it */
	evbuffer_drain(_buf, EVBUFFER_LENGTH(_buf));

	/* Now unmarshal a tag and check that it matches the tag we want */
	if (evtag_unmarshal(src, &tag, _buf) == -1 || tag != need_tag)
		return (-1);

	if (EVBUFFER_LENGTH(_buf) != len)
		return (-1);

	memcpy(data, EVBUFFER_DATA(_buf), len);
	return (0);
}

int
evtag_unmarshal_string(struct evbuffer *evbuf, ev_uint32_t need_tag,
    char **pstring)
{
	ev_uint32_t tag;

	evbuffer_drain(_buf, EVBUFFER_LENGTH(_buf));

	if (evtag_unmarshal(evbuf, &tag, _buf) == -1 || tag != need_tag)
		return (-1);

	*pstring = calloc(EVBUFFER_LENGTH(_buf) + 1, 1);
	if (*pstring == NULL)
		event_err(1, "%s: calloc", __func__);
	evbuffer_remove(_buf, *pstring, EVBUFFER_LENGTH(_buf));

	return (0);
}

int
evtag_unmarshal_timeval(struct evbuffer *evbuf, ev_uint32_t need_tag,
    struct timeval *ptv)
{
	ev_uint32_t tag;
	ev_uint32_t integer;

	evbuffer_drain(_buf, EVBUFFER_LENGTH(_buf));
	if (evtag_unmarshal(evbuf, &tag, _buf) == -1 || tag != need_tag)
		return (-1);

	if (evtag_decode_int(&integer, _buf) == -1)
		return (-1);
	ptv->tv_sec = integer;
	if (evtag_decode_int(&integer, _buf) == -1)
		return (-1);
	ptv->tv_usec = integer;

	return (0);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: event_tagging.c,v 1.10 2014/10/30 16:45:37 bluhm Exp $ */
2
3			/*
4			* Copyright (c) 2003, 2004 Niels Provos <provos@citi.umich.edu>
5			* All rights reserved.
6			*
7			* Redistribution and use in source and binary forms, with or without
8			* modification, are permitted provided that the following conditions
9			* are met:
10			* 1. Redistributions of source code must retain the above copyright
11			* notice, this list of conditions and the following disclaimer.
12			* 2. Redistributions in binary form must reproduce the above copyright
13			* notice, this list of conditions and the following disclaimer in the
14			* documentation and/or other materials provided with the distribution.
15			* 3. The name of the author may not be used to endorse or promote products
16			* derived from this software without specific prior written permission.
17			*
18			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19			* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20			* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21			* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22			* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23			* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24			* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25			* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26			* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27			* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28			*/
29
30			#include <sys/types.h>
31			#include <sys/ioctl.h>
32			#include <sys/queue.h>
33			#include <sys/time.h>
34
35			#include <errno.h>
36			#include <stdio.h>
37			#include <stdlib.h>
38			#include <string.h>
39			#include <syslog.h>
40			#include <unistd.h>
41
42			#include "event.h"
43			#include "log.h"
44
45			int evtag_decode_int(ev_uint32_t pnumber, struct evbuffer evbuf);
46			int evtag_encode_tag(struct evbuffer *evbuf, ev_uint32_t tag);
47			int evtag_decode_tag(ev_uint32_t ptag, struct evbuffer evbuf);
48
49			static struct evbuffer _buf; / not thread safe */
50
51			void
52			evtag_init(void)
53			{
54	✓✗	18	if (_buf != NULL)
55			return;
56
57	✗✓	9	if ((_buf = evbuffer_new()) == NULL)
58			event_err(1, "%s: malloc", __func__);
59		9	}
60
61			/*
62			* We encode integer's by nibbles; the first nibble contains the number
63			* of significant nibbles - 1; this allows us to encode up to 64-bit
64			* integers. This function is byte-order independent.
65			*/
66
67			void
68			encode_int(struct evbuffer *evbuf, ev_uint32_t number)
69			{
70			int off = 1, nibbles = 0;
71		162	ev_uint8_t data[5];
72
73		81	memset(data, 0, sizeof(ev_uint32_t)+1);
74	✓✓	594	while (number) {
75	✓✓	216	if (off & 0x1)
76		126	data[off/2] = (data[off/2] & 0xf0) \| (number & 0x0f);
77			else
78		180	data[off/2] = (data[off/2] & 0x0f) \|
79		90	((number & 0x0f) << 4);
80		216	number >>= 4;
81		216	off++;
82			}
83
84	✓✓	81	if (off > 2)
85		36	nibbles = off - 2;
86
87			/* Off - 1 is the number of encoded nibbles */
88		81	data[0] = (data[0] & 0x0f) \| ((nibbles & 0x0f) << 4);
89
90		81	evbuffer_add(evbuf, data, (off + 1) / 2);
91		81	}
92
93			/*
94			* Support variable length encoding of tags; we use the high bit in each
95			* octet as a continuation signal.
96			*/
97
98			int
99			evtag_encode_tag(struct evbuffer *evbuf, ev_uint32_t tag)
100			{
101			int bytes = 0;
102		126	ev_uint8_t data[5];
103
104		63	memset(data, 0, sizeof(data));
105		63	do {
106		144	ev_uint8_t lower = tag & 0x7f;
107		144	tag >>= 7;
108
109	✓✓	144	if (tag)
110		81	lower \|= 0x80;
111
112		144	data[bytes++] = lower;
113	✓✓	144	} while (tag);
114
115	✓✗	63	if (evbuf != NULL)
116		63	evbuffer_add(evbuf, data, bytes);
117
118		63	return (bytes);
119		63	}
120
121			static int
122			decode_tag_internal(ev_uint32_t ptag, struct evbuffer evbuf, int dodrain)
123			{
124			ev_uint32_t number = 0;
125		1926	ev_uint8_t *data = EVBUFFER_DATA(evbuf);
126		963	int len = EVBUFFER_LENGTH(evbuf);
127			int count = 0, shift = 0, done = 0;
128
129	✓✗	3786	while (count++ < len) {
130		1893	ev_uint8_t lower = *data++;
131		1893	number \|= (lower & 0x7f) << shift;
132		1893	shift += 7;
133
134	✓✓	1893	if (!(lower & 0x80)) {
135			done = 1;
136		963	break;
137			}
138	✓✓	930	}
139
140	✗✓	963	if (!done)
141			return (-1);
142
143	✓✗	963	if (dodrain)
144		963	evbuffer_drain(evbuf, count);
145
146	✓✗	963	if (ptag != NULL)
147		963	*ptag = number;
148
149		963	return (count);
150		963	}
151
152			int
153			evtag_decode_tag(ev_uint32_t ptag, struct evbuffer evbuf)
154			{
155		108	return (decode_tag_internal(ptag, evbuf, 1 /* dodrain */));
156			}
157
158			/*
159			* Marshal a data type, the general format is as follows:
160			*
161			* tag number: one byte; length: var bytes; payload: var bytes
162			*/
163
164			void
165			evtag_marshal(struct evbuffer *evbuf, ev_uint32_t tag,
166			const void *data, ev_uint32_t len)
167			{
168		18	evtag_encode_tag(evbuf, tag);
169		9	encode_int(evbuf, len);
170		9	evbuffer_add(evbuf, data, len);
171		9	}
172
173			/* Marshaling for integers */
174			void
175			evtag_marshal_int(struct evbuffer *evbuf, ev_uint32_t tag, ev_uint32_t integer)
176			{
177			evbuffer_drain(_buf, EVBUFFER_LENGTH(_buf));
178			encode_int(_buf, integer);
179
180			evtag_encode_tag(evbuf, tag);
181			encode_int(evbuf, EVBUFFER_LENGTH(_buf));
182			evbuffer_add_buffer(evbuf, _buf);
183			}
184
185			void
186			evtag_marshal_string(struct evbuffer buf, ev_uint32_t tag, const char string)
187			{
188			evtag_marshal(buf, tag, string, strlen(string));
189			}
190
191			void
192			evtag_marshal_timeval(struct evbuffer evbuf, ev_uint32_t tag, struct timeval tv)
193			{
194		18	evbuffer_drain(_buf, EVBUFFER_LENGTH(_buf));
195
196		9	encode_int(_buf, tv->tv_sec); /* XXX 2038 */
197		9	encode_int(_buf, tv->tv_usec);
198
199		18	evtag_marshal(evbuf, tag, EVBUFFER_DATA(_buf),
200		9	EVBUFFER_LENGTH(_buf));
201		9	}
202
203			static int
204			decode_int_internal(ev_uint32_t pnumber, struct evbuffer evbuf, int dodrain)
205			{
206			ev_uint32_t number = 0;
207		1928	ev_uint8_t *data = EVBUFFER_DATA(evbuf);
208		964	int len = EVBUFFER_LENGTH(evbuf);
209			int nibbles = 0;
210
211	✗✓	964	if (!len)
212			return (-1);
213
214		964	nibbles = ((data[0] & 0xf0) >> 4) + 1;
215	✓✓✗✓	1451	if (nibbles > 8 \|\| (nibbles >> 1) + 1 > len)
216		477	return (-1);
217			len = (nibbles >> 1) + 1;
218
219	✓✓	5462	while (nibbles > 0) {
220		2244	number <<= 4;
221	✓✓	2244	if (nibbles & 0x1)
222		1244	number \|= data[nibbles >> 1] & 0x0f;
223			else
224		1000	number \|= (data[nibbles >> 1] & 0xf0) >> 4;
225		2244	nibbles--;
226			}
227
228	✓✗	487	if (dodrain)
229		487	evbuffer_drain(evbuf, len);
230
231		487	*pnumber = number;
232
233		487	return (len);
234		964	}
235
236			int
237			evtag_decode_int(ev_uint32_t pnumber, struct evbuffer evbuf)
238			{
239		1928	return (decode_int_internal(pnumber, evbuf, 1) == -1 ? -1 : 0);
240			}
241
242			int
243			evtag_peek(struct evbuffer evbuf, ev_uint32_t ptag)
244			{
245			return (decode_tag_internal(ptag, evbuf, 0 /* dodrain */));
246			}
247
248			int
249			evtag_peek_length(struct evbuffer evbuf, ev_uint32_t plength)
250			{
251			struct evbuffer tmp;
252			int res, len;
253
254			len = decode_tag_internal(NULL, evbuf, 0 /* dodrain */);
255			if (len == -1)
256			return (-1);
257
258			tmp = *evbuf;
259			tmp.buffer += len;
260			tmp.off -= len;
261
262			res = decode_int_internal(plength, &tmp, 0);
263			if (res == -1)
264			return (-1);
265
266			*plength += res + len;
267
268			return (0);
269			}
270
271			int
272			evtag_payload_length(struct evbuffer evbuf, ev_uint32_t plength)
273			{
274			struct evbuffer tmp;
275			int res, len;
276
277			len = decode_tag_internal(NULL, evbuf, 0 /* dodrain */);
278			if (len == -1)
279			return (-1);
280
281			tmp = *evbuf;
282			tmp.buffer += len;
283			tmp.off -= len;
284
285			res = decode_int_internal(plength, &tmp, 0);
286			if (res == -1)
287			return (-1);
288
289			return (0);
290			}
291
292			int
293			evtag_consume(struct evbuffer *evbuf)
294			{
295			ev_uint32_t len;
296			if (decode_tag_internal(NULL, evbuf, 1 /* dodrain */) == -1)
297			return (-1);
298			if (evtag_decode_int(&len, evbuf) == -1)
299			return (-1);
300			evbuffer_drain(evbuf, len);
301
302			return (0);
303			}
304
305			/* Reads the data type from an event buffer */
306
307			int
308			evtag_unmarshal(struct evbuffer src, ev_uint32_t ptag, struct evbuffer *dst)
309			{
310			ev_uint32_t len;
311		1818	ev_uint32_t integer;
312
313	✗✓	909	if (decode_tag_internal(ptag, src, 1 /* dodrain */) == -1)
314			return (-1);
315	✓✓	909	if (evtag_decode_int(&integer, src) == -1)
316		476	return (-1);
317		433	len = integer;
318
319	✓✓	433	if (EVBUFFER_LENGTH(src) < len)
320		286	return (-1);
321
322	✗✓	147	if (evbuffer_add(dst, EVBUFFER_DATA(src), len) == -1)
323			return (-1);
324
325		147	evbuffer_drain(src, len);
326
327		147	return (len);
328		909	}
329
330			/* Marshaling for integers */
331
332			int
333			evtag_unmarshal_int(struct evbuffer *evbuf, ev_uint32_t need_tag,
334			ev_uint32_t *pinteger)
335			{
336			ev_uint32_t tag;
337			ev_uint32_t len;
338			ev_uint32_t integer;
339
340			if (decode_tag_internal(&tag, evbuf, 1 /* dodrain */) == -1)
341			return (-1);
342			if (need_tag != tag)
343			return (-1);
344			if (evtag_decode_int(&integer, evbuf) == -1)
345			return (-1);
346			len = integer;
347
348			if (EVBUFFER_LENGTH(evbuf) < len)
349			return (-1);
350
351			evbuffer_drain(_buf, EVBUFFER_LENGTH(_buf));
352			if (evbuffer_add(_buf, EVBUFFER_DATA(evbuf), len) == -1)
353			return (-1);
354
355			evbuffer_drain(evbuf, len);
356
357			return (evtag_decode_int(pinteger, _buf));
358			}
359
360			/* Unmarshal a fixed length tag */
361
362			int
363			evtag_unmarshal_fixed(struct evbuffer src, ev_uint32_t need_tag, void data,
364			size_t len)
365			{
366			ev_uint32_t tag;
367
368			/* Initialize this event buffer so that we can read into it */
369			evbuffer_drain(_buf, EVBUFFER_LENGTH(_buf));
370
371			/* Now unmarshal a tag and check that it matches the tag we want */
372			if (evtag_unmarshal(src, &tag, _buf) == -1 \|\| tag != need_tag)
373			return (-1);
374
375			if (EVBUFFER_LENGTH(_buf) != len)
376			return (-1);
377
378			memcpy(data, EVBUFFER_DATA(_buf), len);
379			return (0);
380			}
381
382			int
383			evtag_unmarshal_string(struct evbuffer *evbuf, ev_uint32_t need_tag,
384			char **pstring)
385			{
386			ev_uint32_t tag;
387
388			evbuffer_drain(_buf, EVBUFFER_LENGTH(_buf));
389
390			if (evtag_unmarshal(evbuf, &tag, _buf) == -1 \|\| tag != need_tag)
391			return (-1);
392
393			*pstring = calloc(EVBUFFER_LENGTH(_buf) + 1, 1);
394			if (*pstring == NULL)
395			event_err(1, "%s: calloc", __func__);
396			evbuffer_remove(_buf, *pstring, EVBUFFER_LENGTH(_buf));
397
398			return (0);
399			}
400
401			int
402			evtag_unmarshal_timeval(struct evbuffer *evbuf, ev_uint32_t need_tag,
403			struct timeval *ptv)
404			{
405		1818	ev_uint32_t tag;
406		909	ev_uint32_t integer;
407
408		909	evbuffer_drain(_buf, EVBUFFER_LENGTH(_buf));
409	✓✓✓✓	1056	if (evtag_unmarshal(evbuf, &tag, _buf) == -1 \|\| tag != need_tag)
410		908	return (-1);
411
412	✓✗	1	if (evtag_decode_int(&integer, _buf) == -1)
413		1	return (-1);
414			ptv->tv_sec = integer;
415			if (evtag_decode_int(&integer, _buf) == -1)
416			return (-1);
417			ptv->tv_usec = integer;
418
419			return (0);
420		909	}