GCOV - Varnish Cache


/*-
 * Copyright (c) 2006-2015 Varnish Software AS
 * All rights reserved.
 *
 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * Do Vary processing.
 *
 * When we insert an object into the cache which has a Vary: header,
 * we encode a vary matching string containing the headers mentioned
 * and their value.
 *
 * When we match an object in the cache, we check the present request
 * against the vary matching string.
 *
 * The only kind of header-munging we do is leading & trailing space
 * removal.  All the potential "q=foo" gymnastics is not worth the
 * effort.
 *
 * The vary matching string has the following format:
 *
 * Sequence of: {
 *      <msb>                   \   Length of header contents.
 *      <lsb>                   /
 *      <length of header + 1>  \
 *      <header>                 \  Same format as argument to http_GetHdr()
 *      ':'                      /
 *      '\0'                    /
 *      <header>                >   Only present if length != 0xffff
 * }
 *      0xff,                   \   Length field
 *      0xff,                   /
 *      '\0'                    >   Terminator
 */

#include "config.h"

#include <stdlib.h>

#include "cache_varnishd.h"

#include "vct.h"
#include "vend.h"

static unsigned VRY_Validate(const uint8_t *vary);

/**********************************************************************
 * Create a Vary matching string from a Vary header
 *
 * Return value:
 * <0: Parse error
 *  0: No Vary header on object
 * >0: Length of Vary matching string in *psb
 */

int
VRY_Create(struct busyobj *bo, struct vsb **psb)
{
        const char *v, *p, *q, *h, *e;
        struct vsb *sb, *sbh;
        unsigned l;
        int error = 0;

        CHECK_OBJ_NOTNULL(bo, BUSYOBJ_MAGIC);
        CHECK_OBJ_NOTNULL(bo->bereq, HTTP_MAGIC);
        CHECK_OBJ_NOTNULL(bo->beresp, HTTP_MAGIC);
        AN(psb);
        AZ(*psb);

        /* No Vary: header, no worries */
        if (!http_GetHdr(bo->beresp, H_Vary, &v))
                return (0);

        /* For vary matching string */
        sb = VSB_new_auto();
        AN(sb);

        /* For header matching strings */
        sbh = VSB_new_auto();
        AN(sbh);

        for (p = v; *p; p++) {

                /* Find next header-name */
                if (vct_issp(*p))
                        continue;
                for (q = p; *q && !vct_issp(*q) && *q != ','; q++)
                        continue;

                if (q - p > INT8_MAX) {
                        VSLb(bo->vsl, SLT_Error,
                            "Vary header name length exceeded");
                        error = 1;
                        break;
                }

                /* Build a header-matching string out of it */
                VSB_clear(sbh);
                AZ(VSB_printf(sbh, "%c%.*s:%c",
                    (char)(1 + (q - p)), (int)(q - p), p, 0));
                AZ(VSB_finish(sbh));

                if (http_GetHdr(bo->bereq, VSB_data(sbh), &h)) {
                        AZ(vct_issp(*h));
                        /* Trim trailing space */
                        e = strchr(h, '\0');
                        while (e > h && vct_issp(e[-1]))
                                e--;
                        /* Encode two byte length and contents */
                        l = e - h;
                        if (l > 0xffff - 1) {
                                VSLb(bo->vsl, SLT_Error,
                                    "Vary header maximum length exceeded");
                                error = 1;
                                break;
                        }
                } else {
                        e = h;
                        l = 0xffff;
                }
                AZ(VSB_printf(sb, "%c%c", (int)(l >> 8), (int)(l & 0xff)));
                /* Append to vary matching string */
                AZ(VSB_bcat(sb, VSB_data(sbh), VSB_len(sbh)));
                if (e != h)
                        AZ(VSB_bcat(sb, h, e - h));

                while (vct_issp(*q))
                        q++;
                if (*q == '\0')
                        break;
                if (*q != ',') {
                        VSLb(bo->vsl, SLT_Error, "Malformed Vary header");
                        error = 1;
                        break;
                }
                p = q;
        }

        if (error) {
                VSB_destroy(&sbh);
                VSB_destroy(&sb);
                return (-1);
        }

        /* Terminate vary matching string */
        VSB_printf(sb, "%c%c%c", 0xff, 0xff, 0);

        VSB_destroy(&sbh);
        AZ(VSB_finish(sb));
        *psb = sb;
        return (VSB_len(sb));
}

/*
 * Find length of a vary entry
 */
static unsigned
VRY_Len(const uint8_t *p)
{
        unsigned l = vbe16dec(p);

        return (2 + p[2] + 2 + (l == 0xffff ? 0 : l));
}

/*
 * Compare two vary entries
 */
static int
vry_cmp(const uint8_t *v1, const uint8_t *v2)
{
        unsigned retval = 0;

        if (!memcmp(v1, v2, VRY_Len(v1))) {
                /* Same same */
                retval = 0;
        } else if (memcmp(v1 + 2, v2 + 2, v1[2] + 2)) {
                /* Different header */
                retval = 1;
        } else if (cache_param->http_gzip_support &&
            http_hdr_eq(H_Accept_Encoding, (const char*) v1 + 2)) {
                /*
                 * If we do gzip processing, we do not vary on Accept-Encoding,
                 * because we want everybody to get the gzip'ed object, and
                 * varnish will gunzip as necessary.  We implement the skip at
                 * check time, rather than create time, so that object in
                 * persistent storage can be used with either setting of
                 * http_gzip_support.
                 */
                retval = 0;
        } else {
                /* Same header, different content */
                retval = 2;
        }
        return (retval);
}

/**********************************************************************
 * Prepare predictive vary string
 */

void
VRY_Prep(struct req *req)
{
        if (req->hash_objhead == NULL) {
                /* Not a waiting list return */
                AZ(req->vary_b);
                AZ(req->vary_e);
                (void)WS_ReserveAll(req->ws);
        } else {
                AN(WS_Reservation(req->ws));
        }
        req->vary_b = WS_Reservation(req->ws);
        req->vary_e = req->vary_b + WS_ReservationSize(req->ws);
        if (req->vary_b + 2 < req->vary_e)
                req->vary_b[2] = '\0';
}

void
VRY_Clear(struct req *req)
{

        CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
        if (req->vary_b != NULL)
                free(req->vary_b);
        req->vary_b = NULL;
        AZ(req->vary_e);
}

/**********************************************************************
 * Finish predictive vary processing
 */

void
VRY_Finish(struct req *req, enum vry_finish_flag flg)
{
        uint8_t *p = NULL;
        size_t l;

        if (req->vary_b + 2 >= req->vary_e) {
                req->vary_b = NULL;
                req->vary_e = NULL;
                WS_Release(req->ws, 0);
                WS_MarkOverflow(req->ws);
                return;
        }

        l = VRY_Validate(req->vary_b);
        if (flg == KEEP && l > 3) {
                p = malloc(l);
                if (p != NULL)
                        memcpy(p, req->vary_b, l);
        }
        WS_Release(req->ws, 0);
        req->vary_e = NULL;
        req->vary_b = p;
}

/**********************************************************************
 * Match vary strings, and build a new cached string if possible.
 *
 * Return zero if there is certainly no match.
 * Return non-zero if there could be a match or if we couldn't tell.
 */

int
VRY_Match(const struct req *req, const uint8_t *vary)
{
        uint8_t *vsp = req->vary_b;
        const char *h, *e;
        unsigned lh, ln;
        int i, oflo = 0;

        AN(vsp);
        AN(vary);
        while (vary[2]) {
                if (vsp + 2 >= req->vary_e) {
                        /*
                         * Too little workspace to find out
                         */
                        oflo = 1;
                        break;
                }
                i = vry_cmp(vary, vsp);
                if (i == 1) {
                        /*
                         * Different header, build a new entry,
                         * then compare again with that new entry.
                         */

                        ln = 2 + vary[2] + 2;
                        i = http_GetHdr(req->http, (const char*)(vary+2), &h);
                        if (i) {
                                /* Trim trailing space */
                                e = strchr(h, '\0');
                                while (e > h && vct_issp(e[-1]))
                                        e--;
                                lh = e - h;
                                assert(lh < 0xffff);
                                ln += lh;
                        } else {
                                e = h = NULL;
                                lh = 0xffff;
                        }

                        if (vsp + ln + 3 >= req->vary_e) {
                                /*
                                 * Not enough space to build new entry
                                 * and put terminator behind it.
                                 */
                                oflo = 1;
                                break;
                        }

                        vbe16enc(vsp, (uint16_t)lh);
                        memcpy(vsp + 2, vary + 2, vary[2] + 2);
                        if (h != NULL)
                                memcpy(vsp + 2 + vsp[2] + 2, h, lh);
                        vsp[ln++] = 0xff;
                        vsp[ln++] = 0xff;
                        vsp[ln++] = 0;
                        assert(VRY_Validate(vsp) == ln);

                        i = vry_cmp(vary, vsp);
                        assert(i == 0 || i == 2);
                }
                if (i == 0) {
                        /* Same header, same contents */
                        vsp += VRY_Len(vsp);
                        vary += VRY_Len(vary);
                } else if (i == 2) {
                        /* Same header, different contents, cannot match */
                        return (0);
                }
        }
        if (oflo) {
                vsp = req->vary_b;
                if (vsp + 2 < req->vary_e) {
                        vsp[0] = 0xff;
                        vsp[1] = 0xff;
                        vsp[2] = 0;
                }
                return (0);
        } else {
                return (1);
        }
}

/*
 * Check the validity of a Vary string and return its total length
 */

static unsigned
VRY_Validate(const uint8_t *vary)
{
        unsigned l, retval = 0;

        while (vary[2] != 0) {
                assert(strlen((const char*)vary + 3) == vary[2]);
                l = VRY_Len(vary);
                retval += l;
                vary += l;
        }
        return (retval + 3);
}

		varnish-cache/bin/varnishd/cache/cache_vary.c
0		/*-
1		* Copyright (c) 2006-2015 Varnish Software AS
2		* All rights reserved.
3		*
4		* Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
5		*
6		* SPDX-License-Identifier: BSD-2-Clause
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		*
17		* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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		* Do Vary processing.
30		*
31		* When we insert an object into the cache which has a Vary: header,
32		* we encode a vary matching string containing the headers mentioned
33		* and their value.
34		*
35		* When we match an object in the cache, we check the present request
36		* against the vary matching string.
37		*
38		* The only kind of header-munging we do is leading & trailing space
39		* removal. All the potential "q=foo" gymnastics is not worth the
40		* effort.
41		*
42		* The vary matching string has the following format:
43		*
44		* Sequence of: {
45		* <msb> \ Length of header contents.
46		* <lsb> /
47		* <length of header + 1> \
48		* <header> \ Same format as argument to http_GetHdr()
49		* ':' /
50		* '\0' /
51		* <header> > Only present if length != 0xffff
52		* }
53		* 0xff, \ Length field
54		* 0xff, /
55		* '\0' > Terminator
56		*/
57
58		#include "config.h"
59
60		#include <stdlib.h>
61
62		#include "cache_varnishd.h"
63
64		#include "vct.h"
65		#include "vend.h"
66
67		static unsigned VRY_Validate(const uint8_t *vary);
68
69		/**********************************************************************
70		* Create a Vary matching string from a Vary header
71		*
72		* Return value:
73		* <0: Parse error
74		* 0: No Vary header on object
75		* >0: Length of Vary matching string in *psb
76		*/
77
78		int
79	34650	VRY_Create(struct busyobj bo, struct vsb *psb)
80		{
81		const char v, p, q, h, *e;
82		struct vsb sb, sbh;
83		unsigned l;
84	34650	int error = 0;
85
86	34650	CHECK_OBJ_NOTNULL(bo, BUSYOBJ_MAGIC);
87	34650	CHECK_OBJ_NOTNULL(bo->bereq, HTTP_MAGIC);
88	34650	CHECK_OBJ_NOTNULL(bo->beresp, HTTP_MAGIC);
89	34650	AN(psb);
90	34650	AZ(*psb);
91
92		/* No Vary: header, no worries */
93	34650	if (!http_GetHdr(bo->beresp, H_Vary, &v))
94	29425	return (0);
95
96		/* For vary matching string */
97	5225	sb = VSB_new_auto();
98	5225	AN(sb);
99
100		/* For header matching strings */
101	5225	sbh = VSB_new_auto();
102	5225	AN(sbh);
103
104	5625	for (p = v; *p; p++) {
105
106		/* Find next header-name */
107	5625	if (vct_issp(*p))
108	200	continue;
109	73200	for (q = p; q && !vct_issp(q) && *q != ','; q++)
110	67775	continue;
111
112	5425	if (q - p > INT8_MAX) {
113	50	VSLb(bo->vsl, SLT_Error,
114		"Vary header name length exceeded");
115	50	error = 1;
116	50	break;
117		}
118
119		/* Build a header-matching string out of it */
120	5375	VSB_clear(sbh);
121	5375	AZ(VSB_printf(sbh, "%c%.*s:%c",
122		(char)(1 + (q - p)), (int)(q - p), p, 0));
123	5375	AZ(VSB_finish(sbh));
124
125	5375	if (http_GetHdr(bo->bereq, VSB_data(sbh), &h)) {
126	4975	AZ(vct_issp(*h));
127		/* Trim trailing space */
128	4975	e = strchr(h, '\0');
129	4975	while (e > h && vct_issp(e[-1]))
130	0	e--;
131		/* Encode two byte length and contents */
132	4975	l = e - h;
133	4975	if (l > 0xffff - 1) {
134	0	VSLb(bo->vsl, SLT_Error,
135		"Vary header maximum length exceeded");
136	0	error = 1;
137	0	break;
138		}
139	4975	} else {
140	400	e = h;
141	400	l = 0xffff;
142		}
143	5375	AZ(VSB_printf(sb, "%c%c", (int)(l >> 8), (int)(l & 0xff)));
144		/* Append to vary matching string */
145	5375	AZ(VSB_bcat(sb, VSB_data(sbh), VSB_len(sbh)));
146	5375	if (e != h)
147	4950	AZ(VSB_bcat(sb, h, e - h));
148
149	5450	while (vct_issp(*q))
150	75	q++;
151	5375	if (*q == '\0')
152	5100	break;
153	275	if (*q != ',') {
154	75	VSLb(bo->vsl, SLT_Error, "Malformed Vary header");
155	75	error = 1;
156	75	break;
157		}
158	200	p = q;
159	200	}
160
161	5225	if (error) {
162	125	VSB_destroy(&sbh);
163	125	VSB_destroy(&sb);
164	125	return (-1);
165		}
166
167		/* Terminate vary matching string */
168	5100	VSB_printf(sb, "%c%c%c", 0xff, 0xff, 0);
169
170	5100	VSB_destroy(&sbh);
171	5100	AZ(VSB_finish(sb));
172	5100	*psb = sb;
173	5100	return (VSB_len(sb));
174	34650	}
175
176		/*
177		* Find length of a vary entry
178		*/
179		static unsigned
180	96319	VRY_Len(const uint8_t *p)
181		{
182	96319	unsigned l = vbe16dec(p);
183
184	96319	return (2 + p[2] + 2 + (l == 0xffff ? 0 : l));
185		}
186
187		/*
188		* Compare two vary entries
189		*/
190		static int
191	75773	vry_cmp(const uint8_t v1, const uint8_t v2)
192		{
193	75773	unsigned retval = 0;
194
195	75773	if (!memcmp(v1, v2, VRY_Len(v1))) {
196		/* Same same */
197	3323	retval = 0;
198	75773	} else if (memcmp(v1 + 2, v2 + 2, v1[2] + 2)) {
199		/* Different header */
200	6350	retval = 1;
201	72450	} else if (cache_param->http_gzip_support &&
202	66075	http_hdr_eq(H_Accept_Encoding, (const char*) v1 + 2)) {
203		/*
204		* If we do gzip processing, we do not vary on Accept-Encoding,
205		* because we want everybody to get the gzip'ed object, and
206		* varnish will gunzip as necessary. We implement the skip at
207		* check time, rather than create time, so that object in
208		* persistent storage can be used with either setting of
209		* http_gzip_support.
210		*/
211	650	retval = 0;
212	650	} else {
213		/* Same header, different content */
214	65450	retval = 2;
215		}
216	75773	return (retval);
217		}
218
219		/**********************************************************************
220		* Prepare predictive vary string
221		*/
222
223		void
224	61207	VRY_Prep(struct req *req)
225		{
226	61207	if (req->hash_objhead == NULL) {
227		/* Not a waiting list return */
228	60049	AZ(req->vary_b);
229	60049	AZ(req->vary_e);
230	60049	(void)WS_ReserveAll(req->ws);
231	60049	} else {
232	1158	AN(WS_Reservation(req->ws));
233		}
234	61207	req->vary_b = WS_Reservation(req->ws);
235	61207	req->vary_e = req->vary_b + WS_ReservationSize(req->ws);
236	61207	if (req->vary_b + 2 < req->vary_e)
237	61186	req->vary_b[2] = '\0';
238	61211	}
239
240		void
241	463	VRY_Clear(struct req *req)
242		{
243
244	463	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
245	463	if (req->vary_b != NULL)
246	50	free(req->vary_b);
247	463	req->vary_b = NULL;
248	463	AZ(req->vary_e);
249	463	}
250
251		/**********************************************************************
252		* Finish predictive vary processing
253		*/
254
255		void
256	60058	VRY_Finish(struct req *req, enum vry_finish_flag flg)
257		{
258	60058	uint8_t *p = NULL;
259		size_t l;
260
261	60058	if (req->vary_b + 2 >= req->vary_e) {
262	25	req->vary_b = NULL;
263	25	req->vary_e = NULL;
264	25	WS_Release(req->ws, 0);
265	25	WS_MarkOverflow(req->ws);
266	25	return;
267		}
268
269	60033	l = VRY_Validate(req->vary_b);
270	60033	if (flg == KEEP && l > 3) {
271	2500	p = malloc(l);
272	2500	if (p != NULL)
273	2500	memcpy(p, req->vary_b, l);
274	2500	}
275	60033	WS_Release(req->ws, 0);
276	60033	req->vary_e = NULL;
277	60033	req->vary_b = p;
278	60058	}
279
280		/**********************************************************************
281		* Match vary strings, and build a new cached string if possible.
282		*
283		* Return zero if there is certainly no match.
284		* Return non-zero if there could be a match or if we couldn't tell.
285		*/
286
287		int
288	69248	VRY_Match(const struct req req, const uint8_t vary)
289		{
290	69248	uint8_t *vsp = req->vary_b;
291		const char h, e;
292		unsigned lh, ln;
293	69248	int i, oflo = 0;
294
295	69248	AN(vsp);
296	69248	AN(vary);
297	73221	while (vary[2]) {
298	69448	if (vsp + 2 >= req->vary_e) {
299		/*
300		* Too little workspace to find out
301		*/
302	0	oflo = 1;
303	0	break;
304		}
305	69448	i = vry_cmp(vary, vsp);
306	69448	if (i == 1) {
307		/*
308		* Different header, build a new entry,
309		* then compare again with that new entry.
310		*/
311
312	6350	ln = 2 + vary[2] + 2;
313	6350	i = http_GetHdr(req->http, (const char*)(vary+2), &h);
314	6350	if (i) {
315		/* Trim trailing space */
316	3625	e = strchr(h, '\0');
317	3625	while (e > h && vct_issp(e[-1]))
318	0	e--;
319	3625	lh = e - h;
320	3625	assert(lh < 0xffff);
321	3625	ln += lh;
322	3625	} else {
323	2725	e = h = NULL;
324	2725	lh = 0xffff;
325		}
326
327	6350	if (vsp + ln + 3 >= req->vary_e) {
328		/*
329		* Not enough space to build new entry
330		* and put terminator behind it.
331		*/
332	25	oflo = 1;
333	25	break;
334		}
335
336	6325	vbe16enc(vsp, (uint16_t)lh);
337	6325	memcpy(vsp + 2, vary + 2, vary[2] + 2);
338	6325	if (h != NULL)
339	3600	memcpy(vsp + 2 + vsp[2] + 2, h, lh);
340	6325	vsp[ln++] = 0xff;
341	6325	vsp[ln++] = 0xff;
342	6325	vsp[ln++] = 0;
343	6325	assert(VRY_Validate(vsp) == ln);
344
345	6325	i = vry_cmp(vary, vsp);
346	6325	assert(i == 0 \|\| i == 2);
347	6325	}
348	69423	if (i == 0) {
349		/* Same header, same contents */
350	3973	vsp += VRY_Len(vsp);
351	3973	vary += VRY_Len(vary);
352	69423	} else if (i == 2) {
353		/* Same header, different contents, cannot match */
354	65450	return (0);
355		}
356		}
357	3798	if (oflo) {
358	25	vsp = req->vary_b;
359	25	if (vsp + 2 < req->vary_e) {
360	25	vsp[0] = 0xff;
361	25	vsp[1] = 0xff;
362	25	vsp[2] = 0;
363	25	}
364	25	return (0);
365		} else {
366	3773	return (1);
367		}
368	69248	}
369
370		/*
371		* Check the validity of a Vary string and return its total length
372		*/
373
374		static unsigned
375	66357	VRY_Validate(const uint8_t *vary)
376		{
377	66357	unsigned l, retval = 0;
378
379	78957	while (vary[2] != 0) {
380	12600	assert(strlen((const char*)vary + 3) == vary[2]);
381	12600	l = VRY_Len(vary);
382	12600	retval += l;
383	12600	vary += l;
384		}
385	66357	return (retval + 3);
386		}