GCOV - Varnish Cache


/*-
 * Copyright (c) 2016 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.
 *
 */

#include "config.h"

#include "cache/cache_varnishd.h"

#include <stdio.h>

#include "cache/cache_transport.h"
#include "http2/cache_http2.h"

#include "vend.h"
#include "vtcp.h"

static const char h2_resp_101[] =
        "HTTP/1.1 101 Switching Protocols\r\n"
        "Connection: Upgrade\r\n"
        "Upgrade: h2c\r\n"
        "\r\n";

static const char H2_prism[24] = {
        0x50, 0x52, 0x49, 0x20, 0x2a, 0x20, 0x48, 0x54,
        0x54, 0x50, 0x2f, 0x32, 0x2e, 0x30, 0x0d, 0x0a,
        0x0d, 0x0a, 0x53, 0x4d, 0x0d, 0x0a, 0x0d, 0x0a
};

static size_t
h2_enc_settings(const struct h2_settings *h2s, uint8_t *buf, ssize_t n)
{
        uint8_t *p = buf;

#define H2_SETTING(U,l,v,d,...)                         \
        if (h2s->l != d) {                              \
                n -= 6;                                 \
                assert(n >= 0);                         \
                vbe16enc(p, v);                         \
                p += 2;                                 \
                vbe32enc(p, h2s->l);                    \
                p += 4;                                 \
        }
#include "tbl/h2_settings.h"
        return (p - buf);
}

static const struct h2_settings H2_proto_settings = {
#define H2_SETTING(U,l,v,d,...) . l = d,
#include "tbl/h2_settings.h"
};

static void
h2_local_settings(struct h2_settings *h2s)
{
        *h2s = H2_proto_settings;
#define H2_SETTINGS_PARAM_ONLY
#define H2_SETTING(U, l, ...)                   \
        h2s->l = cache_param->h2_##l;
#include "tbl/h2_settings.h"
#undef H2_SETTINGS_PARAM_ONLY
        h2s->max_header_list_size = cache_param->http_req_size;
}

void
H2S_Lock_VSLb(const struct h2_sess *h2, enum VSL_tag_e tag, const char *fmt, ...)
{
        va_list ap;
        int held = 0;

        AN(h2);

        if (VSL_tag_is_masked(tag))
                return;

        if (h2->highest_stream > 0) {
                held = 1;
                Lck_Lock(&h2->sess->mtx);
        }

        va_start(ap, fmt);
        VSLbv(h2->vsl, tag, fmt, ap);
        va_end(ap);

        if (held)
                Lck_Unlock(&h2->sess->mtx);
}

/**********************************************************************
 * The h2_sess struct needs many of the same things as a request,
 * WS, VSL, HTC &c,  but rather than implement all that stuff over, we
 * grab an actual struct req, and mirror the relevant fields into
 * struct h2_sess.
 */

static struct h2_sess *
h2_init_sess(struct sess *sp,
    struct h2_sess *h2s, struct req *srq, struct h2h_decode *decode)
{
        uintptr_t *up;
        struct h2_sess *h2;

        /* proto_priv session attribute will always have been set up by H1
         * before reaching here. */
        AZ(SES_Get_proto_priv(sp, &up));
        assert(*up == 0);

        if (srq == NULL)
                srq = Req_New(sp, NULL);
        AN(srq);
        h2 = h2s;
        AN(h2);
        INIT_OBJ(h2, H2_SESS_MAGIC);
        h2->srq = srq;
        h2->htc = srq->htc;
        h2->ws = srq->ws;
        h2->vsl = srq->vsl;
        VSL_Flush(h2->vsl, 0);
        h2->vsl->wid = sp->vxid;
        h2->htc->rfd = &sp->fd;
        h2->sess = sp;
        h2->rxthr = pthread_self();
        PTOK(pthread_cond_init(h2->winupd_cond, NULL));
        VTAILQ_INIT(&h2->streams);
        VTAILQ_INIT(&h2->txqueue);
        h2_local_settings(&h2->local_settings);
        h2->remote_settings = H2_proto_settings;
        h2->decode = decode;

        h2->rapid_reset = cache_param->h2_rapid_reset;
        h2->rapid_reset_limit = cache_param->h2_rapid_reset_limit;
        h2->rapid_reset_period = cache_param->h2_rapid_reset_period;

        h2->rst_budget = h2->rapid_reset_limit;
        h2->last_rst = sp->t_open;
        AZ(isnan(h2->last_rst));

        AZ(VHT_Init(h2->dectbl, h2->local_settings.header_table_size));

        *up = (uintptr_t)h2;

        return (h2);
}

static void
h2_del_sess(struct worker *wrk, struct h2_sess *h2, stream_close_t reason)
{
        struct sess *sp;
        struct req *req;

        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        AZ(h2->refcnt);
        assert(VTAILQ_EMPTY(&h2->streams));
        AN(reason);

        VHT_Fini(h2->dectbl);
        PTOK(pthread_cond_destroy(h2->winupd_cond));
        TAKE_OBJ_NOTNULL(req, &h2->srq, REQ_MAGIC);
        assert(!WS_IsReserved(req->ws));
        sp = h2->sess;
        Req_Cleanup(sp, wrk, req);
        Req_Release(req);
        SES_Delete(sp, reason, NAN);
}

/**********************************************************************/

enum htc_status_e v_matchproto_(htc_complete_f)
H2_prism_complete(struct http_conn *htc)
{
        size_t sz;

        CHECK_OBJ_NOTNULL(htc, HTTP_CONN_MAGIC);
        sz = sizeof(H2_prism);
        if (htc->rxbuf_b + sz > htc->rxbuf_e)
                sz = htc->rxbuf_e - htc->rxbuf_b;
        if (memcmp(htc->rxbuf_b, H2_prism, sz))
                return (HTC_S_JUNK);
        return (sz == sizeof(H2_prism) ? HTC_S_COMPLETE : HTC_S_MORE);
}


/**********************************************************************
 * Deal with the base64url (NB: ...url!) encoded SETTINGS in the H1 req
 * of a H2C upgrade.
 */

static int
h2_b64url_settings(struct h2_sess *h2, struct req *req)
{
        const char *p, *q;
        uint8_t u[6], *up;
        unsigned x;
        int i, n;
        static const char s[] =
            "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
            "abcdefghijklmnopqrstuvwxyz"
            "0123456789"
            "-_=";

        /*
         * If there is trouble with this, we could reject the upgrade
         * but putting this on the H1 side is just plain wrong...
         */
        if (!http_GetHdr(req->http, H_HTTP2_Settings, &p))
                return (-1);
        AN(p);
        VSLb(req->vsl, SLT_Debug, "H2CS %s", p);

        n = 0;
        x = 0;
        up = u;
        for (;*p; p++) {
                q = strchr(s, *p);
                if (q == NULL)
                        return (-1);
                i = q - s;
                assert(i >= 0 && i <= 64);
                x <<= 6;
                x |= i;
                n += 6;
                if (n < 8)
                        continue;
                *up++ = (uint8_t)(x >> (n - 8));
                n -= 8;
                if (up == u + sizeof u) {
                        AZ(n);
                        if (h2_set_setting(h2, (void*)u))
                                return (-1);
                        up = u;
                }
        }
        if (up != u)
                return (-1);
        return (0);
}


/**********************************************************************/

static int
h2_ou_rel(struct worker *wrk, struct req *req)
{
        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
        AZ(req->vcl);
        Req_AcctLogCharge(wrk->stats, req);
        Req_Release(req);
        return (0);
}

static int
h2_ou_session(struct worker *wrk, struct h2_sess *h2,
    struct req *req)
{
        ssize_t sz;
        enum htc_status_e hs;
        struct h2_req *r2;

        if (h2_b64url_settings(h2, req)) {
                VSLb(h2->vsl, SLT_Debug, "H2: Bad HTTP-Settings");
                return (h2_ou_rel(wrk, req));
        }

        sz = write(h2->sess->fd, h2_resp_101, strlen(h2_resp_101));
        VTCP_Assert(sz);
        if (sz != strlen(h2_resp_101)) {
                VSLb(h2->vsl, SLT_Debug, "H2: Upgrade: Error writing 101"
                    " response: %s\n", VAS_errtxt(errno));
                return (h2_ou_rel(wrk, req));
        }

        http_Unset(req->http, H_Upgrade);
        http_Unset(req->http, H_HTTP2_Settings);

        /* Steal pipelined read-ahead, if any */
        h2->htc->pipeline_b = req->htc->pipeline_b;
        h2->htc->pipeline_e = req->htc->pipeline_e;
        req->htc->pipeline_b = NULL;
        req->htc->pipeline_e = NULL;
        /* XXX: This call may assert on buffer overflow if the pipelined
           data exceeds the available space in the ws workspace. What to
           do about the overflowing data is an open issue. */
        HTC_RxInit(h2->htc, h2->ws);

        /* Start req thread */
        r2 = h2_new_req(h2, 1, req);
        AZ(h2->highest_stream);
        h2->highest_stream = r2->stream;
        req->transport = &HTTP2_transport;
        assert(req->req_step == R_STP_TRANSPORT);
        req->task->func = h2_do_req;
        req->task->priv = req;
        r2->scheduled = 1;
        r2->state = H2_S_CLOS_REM; // rfc7540,l,489,491
        req->err_code = 0;
        http_SetH(req->http, HTTP_HDR_PROTO, "HTTP/2.0");

        /* Wait for PRISM response */
        hs = HTC_RxStuff(h2->htc, H2_prism_complete,
            NULL, NULL, NAN, h2->sess->t_idle + cache_param->timeout_idle, NAN,
            sizeof H2_prism);
        if (hs != HTC_S_COMPLETE) {
                VSLb(h2->vsl, SLT_Debug, "H2: No/Bad OU PRISM (hs=%d)", hs);
                r2->scheduled = 0;
                h2_del_req(wrk, r2);
                return (0);
        }
        if (Pool_Task(wrk->pool, req->task, TASK_QUEUE_REQ)) {
                r2->scheduled = 0;
                h2_del_req(wrk, r2);
                VSLb(h2->vsl, SLT_Debug, "H2: No Worker-threads");
                return (0);
        }
        return (1);
}

/**********************************************************************
 */

#define H2_PU_MARKER    1
#define H2_OU_MARKER    2

void
H2_PU_Sess(struct worker *wrk, struct sess *sp, struct req *req)
{
        VSL(SLT_Debug, sp->vxid, "H2 Prior Knowledge Upgrade");
        req->err_code = H2_PU_MARKER;
        SES_SetTransport(wrk, sp, req, &HTTP2_transport);
}

void
H2_OU_Sess(struct worker *wrk, struct sess *sp, struct req *req)
{
        VSL(SLT_Debug, sp->vxid, "H2 Optimistic Upgrade");
        req->err_code = H2_OU_MARKER;
        SES_SetTransport(wrk, sp, req, &HTTP2_transport);
}

static void v_matchproto_(task_func_t)
h2_new_session(struct worker *wrk, void *arg)
{
        struct req *req;
        struct sess *sp;
        struct h2_sess h2s;
        struct h2_sess *h2;
        struct h2_req *r2, *r22;
        int again;
        uint8_t settings[48];
        struct h2h_decode decode;
        size_t l;

        CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
        CAST_OBJ_NOTNULL(req, arg, REQ_MAGIC);
        sp = req->sp;
        CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);

        if (wrk->wpriv->vcl)
                VCL_Rel(&wrk->wpriv->vcl);

        assert(req->transport == &HTTP2_transport);

        assert (req->err_code == H2_PU_MARKER || req->err_code == H2_OU_MARKER);

        h2 = h2_init_sess(sp, &h2s,
            req->err_code == H2_PU_MARKER ? req : NULL, &decode);
        h2->req0 = h2_new_req(h2, 0, NULL);
        AZ(h2->htc->priv);
        h2->htc->priv = h2;

        AZ(wrk->vsl);
        wrk->vsl = h2->vsl;

        if (req->err_code == H2_OU_MARKER && !h2_ou_session(wrk, h2, req)) {
                assert(h2->refcnt == 1);
                h2_del_req(wrk, h2->req0);
                h2_del_sess(wrk, h2, SC_RX_JUNK);
                wrk->vsl = NULL;
                return;
        }
        assert(HTC_S_COMPLETE == H2_prism_complete(h2->htc));
        HTC_RxPipeline(h2->htc, h2->htc->rxbuf_b + sizeof(H2_prism));
        HTC_RxInit(h2->htc, h2->ws);
        AN(WS_Reservation(h2->ws));
        VSLb(h2->vsl, SLT_Debug, "H2: Got pu PRISM");

        THR_SetRequest(h2->srq);
        AN(WS_Reservation(h2->ws));

        l = h2_enc_settings(&h2->local_settings, settings, sizeof (settings));
        AN(WS_Reservation(h2->ws));
        H2_Send_Get(wrk, h2, h2->req0);
        AN(WS_Reservation(h2->ws));
        H2_Send_Frame(wrk, h2,
            H2_F_SETTINGS, H2FF_NONE, l, 0, settings);
        AN(WS_Reservation(h2->ws));
        H2_Send_Rel(h2, h2->req0);
        AN(WS_Reservation(h2->ws));

        /* and off we go... */
        h2->cond = &wrk->cond;

        while (h2_rxframe(wrk, h2)) {
                HTC_RxInit(h2->htc, h2->ws);
                if (WS_Overflowed(h2->ws)) {
                        H2S_Lock_VSLb(h2, SLT_SessError, "H2: Empty Rx Workspace");
                        h2->error = H2CE_INTERNAL_ERROR;
                        break;
                }
                AN(WS_Reservation(h2->ws));
        }

        AN(h2->error);

        /* Delete all idle streams */
        Lck_Lock(&h2->sess->mtx);
        VSLb(h2->vsl, SLT_Debug, "H2 CLEANUP %s", h2->error->name);
        VTAILQ_FOREACH(r2, &h2->streams, list) {
                if (r2->error == 0)
                        r2->error = h2->error;
                if (r2->cond != NULL)
                        PTOK(pthread_cond_signal(r2->cond));
        }
        PTOK(pthread_cond_broadcast(h2->winupd_cond));
        Lck_Unlock(&h2->sess->mtx);
        while (1) {
                again = 0;
                VTAILQ_FOREACH_SAFE(r2, &h2->streams, list, r22) {
                        if (r2 != h2->req0) {
                                h2_kill_req(wrk, h2, r2, h2->error);
                                again++;
                        }
                }
                if (!again)
                        break;
                Lck_Lock(&h2->sess->mtx);
                VTAILQ_FOREACH(r2, &h2->streams, list)
                        VSLb(h2->vsl, SLT_Debug, "ST %u %d",
                            r2->stream, r2->state);
                (void)Lck_CondWaitTimeout(h2->cond, &h2->sess->mtx, .1);
                Lck_Unlock(&h2->sess->mtx);
        }
        h2->cond = NULL;
        assert(h2->refcnt == 1);
        h2_del_req(wrk, h2->req0);
        h2_del_sess(wrk, h2, h2->error->reason);
        wrk->vsl = NULL;
}

static int v_matchproto_(vtr_poll_f)
h2_poll(struct req *req)
{
        struct h2_req *r2;

        CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
        CAST_OBJ_NOTNULL(r2, req->transport_priv, H2_REQ_MAGIC);
        return (r2->error ? -1 : 1);
}

struct transport HTTP2_transport = {
        .name =                 "HTTP/2",
        .magic =                TRANSPORT_MAGIC,
        .deliver =              h2_deliver,
        .minimal_response =     h2_minimal_response,
        .new_session =          h2_new_session,
        .req_body =             h2_req_body,
        .req_fail =             h2_req_fail,
        .sess_panic =           h2_sess_panic,
        .poll =                 h2_poll,
};

		varnish-cache/bin/varnishd/http2/cache_http2_session.c
0		/*-
1		* Copyright (c) 2016 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		*/
30
31		#include "config.h"
32
33		#include "cache/cache_varnishd.h"
34
35		#include <stdio.h>
36
37		#include "cache/cache_transport.h"
38		#include "http2/cache_http2.h"
39
40		#include "vend.h"
41		#include "vtcp.h"
42	150
43		static const char h2_resp_101[] =
44		"HTTP/1.1 101 Switching Protocols\r\n"
45		"Connection: Upgrade\r\n"
46		"Upgrade: h2c\r\n"
47		"\r\n";
48
49		static const char H2_prism[24] = {
50		0x50, 0x52, 0x49, 0x20, 0x2a, 0x20, 0x48, 0x54,
51		0x54, 0x50, 0x2f, 0x32, 0x2e, 0x30, 0x0d, 0x0a,
52		0x0d, 0x0a, 0x53, 0x4d, 0x0d, 0x0a, 0x0d, 0x0a
53	150	};
54
55		static size_t
56	150	h2_enc_settings(const struct h2_settings h2s, uint8_t buf, ssize_t n)
57		{
58	150	uint8_t *p = buf;
59
60		#define H2_SETTING(U,l,v,d,...) \
61		if (h2s->l != d) { \
62		n -= 6; \
63		assert(n >= 0); \
64	150	vbe16enc(p, v); \
65		p += 2; \
66		vbe32enc(p, h2s->l); \
67		p += 4; \
68		}
69		#include "tbl/h2_settings.h"
70		return (p - buf);
71		}
72
73		static const struct h2_settings H2_proto_settings = {
74	150	#define H2_SETTING(U,l,v,d,...) . l = d,
75		#include "tbl/h2_settings.h"
76		};
77
78		static void
79	154	h2_local_settings(struct h2_settings *h2s)
80		{
81	154	*h2s = H2_proto_settings;
82		#define H2_SETTINGS_PARAM_ONLY
83		#define H2_SETTING(U, l, ...) \
84	150	h2s->l = cache_param->h2_##l;
85		#include "tbl/h2_settings.h"
86		#undef H2_SETTINGS_PARAM_ONLY
87		h2s->max_header_list_size = cache_param->http_req_size;
88		}
89
90		void
91	265	H2S_Lock_VSLb(const struct h2_sess h2, enum VSL_tag_e tag, const char fmt, ...)
92		{
93		va_list ap;
94	265	int held = 0;
95	150
96	265	AN(h2);
97
98	265	if (VSL_tag_is_masked(tag))
99	0	return;
100
101	265	if (h2->highest_stream > 0) {
102	240	held = 1;
103	240	Lck_Lock(&h2->sess->mtx);
104	240	}
105	150
106	265	va_start(ap, fmt);
107	265	VSLbv(h2->vsl, tag, fmt, ap);
108	265	va_end(ap);
109
110	265	if (held)
111	240	Lck_Unlock(&h2->sess->mtx);
112	265	}
113
114		/**********************************************************************
115	150	* The h2_sess struct needs many of the same things as a request,
116		* WS, VSL, HTC &c, but rather than implement all that stuff over, we
117		* grab an actual struct req, and mirror the relevant fields into
118		* struct h2_sess.
119		*/
120
121		static struct h2_sess *
122	154	h2_init_sess(struct sess *sp,
123		struct h2_sess h2s, struct req srq, struct h2h_decode *decode)
124		{
125	150	uintptr_t *up;
126		struct h2_sess *h2;
127
128		/* proto_priv session attribute will always have been set up by H1
129		* before reaching here. */
130	154	AZ(SES_Get_proto_priv(sp, &up));
131	154	assert(*up == 0);
132
133	154	if (srq == NULL)
134	7	srq = Req_New(sp, NULL);
135	154	AN(srq);
136	154	h2 = h2s;
137	154	AN(h2);
138	154	INIT_OBJ(h2, H2_SESS_MAGIC);
139	154	h2->srq = srq;
140	154	h2->htc = srq->htc;
141	154	h2->ws = srq->ws;
142	154	h2->vsl = srq->vsl;
143	154	VSL_Flush(h2->vsl, 0);
144	154	h2->vsl->wid = sp->vxid;
145	154	h2->htc->rfd = &sp->fd;
146	154	h2->sess = sp;
147	154	h2->rxthr = pthread_self();
148	154	PTOK(pthread_cond_init(h2->winupd_cond, NULL));
149	154	VTAILQ_INIT(&h2->streams);
150	154	VTAILQ_INIT(&h2->txqueue);
151	154	h2_local_settings(&h2->local_settings);
152	154	h2->remote_settings = H2_proto_settings;
153	154	h2->decode = decode;
154
155	154	h2->rapid_reset = cache_param->h2_rapid_reset;
156	154	h2->rapid_reset_limit = cache_param->h2_rapid_reset_limit;
157	154	h2->rapid_reset_period = cache_param->h2_rapid_reset_period;
158
159	154	h2->rst_budget = h2->rapid_reset_limit;
160	154	h2->last_rst = sp->t_open;
161	154	AZ(isnan(h2->last_rst));
162
163	154	AZ(VHT_Init(h2->dectbl, h2->local_settings.header_table_size));
164
165	154	*up = (uintptr_t)h2;
166
167	154	return (h2);
168		}
169
170		static void
171	153	h2_del_sess(struct worker wrk, struct h2_sess h2, stream_close_t reason)
172		{
173		struct sess *sp;
174		struct req *req;
175
176	153	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
177	153	AZ(h2->refcnt);
178	153	assert(VTAILQ_EMPTY(&h2->streams));
179	153	AN(reason);
180
181	153	VHT_Fini(h2->dectbl);
182	153	PTOK(pthread_cond_destroy(h2->winupd_cond));
183	153	TAKE_OBJ_NOTNULL(req, &h2->srq, REQ_MAGIC);
184	153	assert(!WS_IsReserved(req->ws));
185	153	sp = h2->sess;
186	153	Req_Cleanup(sp, wrk, req);
187	153	Req_Release(req);
188	153	SES_Delete(sp, reason, NAN);
189	153	}
190
191		/**********************************************************************/
192
193		enum htc_status_e v_matchproto_(htc_complete_f)
194	9881	H2_prism_complete(struct http_conn *htc)
195		{
196		size_t sz;
197
198	9881	CHECK_OBJ_NOTNULL(htc, HTTP_CONN_MAGIC);
199	9881	sz = sizeof(H2_prism);
200	9881	if (htc->rxbuf_b + sz > htc->rxbuf_e)
201	207	sz = htc->rxbuf_e - htc->rxbuf_b;
202	9881	if (memcmp(htc->rxbuf_b, H2_prism, sz))
203	9271	return (HTC_S_JUNK);
204	610	return (sz == sizeof(H2_prism) ? HTC_S_COMPLETE : HTC_S_MORE);
205	9881	}
206
207
208		/**********************************************************************
209		* Deal with the base64url (NB: ...url!) encoded SETTINGS in the H1 req
210		* of a H2C upgrade.
211		*/
212
213		static int
214	7	h2_b64url_settings(struct h2_sess h2, struct req req)
215		{
216		const char p, q;
217		uint8_t u[6], *up;
218		unsigned x;
219		int i, n;
220		static const char s[] =
221		"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
222		"abcdefghijklmnopqrstuvwxyz"
223		"0123456789"
224		"-_=";
225
226		/*
227		* If there is trouble with this, we could reject the upgrade
228		* but putting this on the H1 side is just plain wrong...
229		*/
230	7	if (!http_GetHdr(req->http, H_HTTP2_Settings, &p))
231	1	return (-1);
232	6	AN(p);
233	6	VSLb(req->vsl, SLT_Debug, "H2CS %s", p);
234
235	6	n = 0;
236	6	x = 0;
237	6	up = u;
238	86	for (;*p; p++) {
239	81	q = strchr(s, *p);
240	81	if (q == NULL)
241	1	return (-1);
242	80	i = q - s;
243	80	assert(i >= 0 && i <= 64);
244	80	x <<= 6;
245	80	x \|= i;
246	80	n += 6;
247	80	if (n < 8)
248	20	continue;
249	60	*up++ = (uint8_t)(x >> (n - 8));
250	60	n -= 8;
251	60	if (up == u + sizeof u) {
252	10	AZ(n);
253	10	if (h2_set_setting(h2, (void*)u))
254	0	return (-1);
255	10	up = u;
256	10	}
257	60	}
258	5	if (up != u)
259	0	return (-1);
260	5	return (0);
261	7	}
262
263
264		/**********************************************************************/
265
266		static int
267	2	h2_ou_rel(struct worker wrk, struct req req)
268		{
269	2	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
270	2	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
271	2	AZ(req->vcl);
272	2	Req_AcctLogCharge(wrk->stats, req);
273	2	Req_Release(req);
274	2	return (0);
275		}
276
277		static int
278	7	h2_ou_session(struct worker wrk, struct h2_sess h2,
279		struct req *req)
280		{
281		ssize_t sz;
282		enum htc_status_e hs;
283		struct h2_req *r2;
284
285	7	if (h2_b64url_settings(h2, req)) {
286	2	VSLb(h2->vsl, SLT_Debug, "H2: Bad HTTP-Settings");
287	2	return (h2_ou_rel(wrk, req));
288		}
289
290	5	sz = write(h2->sess->fd, h2_resp_101, strlen(h2_resp_101));
291	5	VTCP_Assert(sz);
292	5	if (sz != strlen(h2_resp_101)) {
293	0	VSLb(h2->vsl, SLT_Debug, "H2: Upgrade: Error writing 101"
294	0	" response: %s\n", VAS_errtxt(errno));
295	0	return (h2_ou_rel(wrk, req));
296		}
297
298	5	http_Unset(req->http, H_Upgrade);
299	5	http_Unset(req->http, H_HTTP2_Settings);
300
301		/* Steal pipelined read-ahead, if any */
302	5	h2->htc->pipeline_b = req->htc->pipeline_b;
303	5	h2->htc->pipeline_e = req->htc->pipeline_e;
304	5	req->htc->pipeline_b = NULL;
305	5	req->htc->pipeline_e = NULL;
306		/* XXX: This call may assert on buffer overflow if the pipelined
307		data exceeds the available space in the ws workspace. What to
308		do about the overflowing data is an open issue. */
309	5	HTC_RxInit(h2->htc, h2->ws);
310
311		/* Start req thread */
312	5	r2 = h2_new_req(h2, 1, req);
313	5	AZ(h2->highest_stream);
314	5	h2->highest_stream = r2->stream;
315	5	req->transport = &HTTP2_transport;
316	5	assert(req->req_step == R_STP_TRANSPORT);
317	5	req->task->func = h2_do_req;
318	5	req->task->priv = req;
319	5	r2->scheduled = 1;
320	5	r2->state = H2_S_CLOS_REM; // rfc7540,l,489,491
321	5	req->err_code = 0;
322	5	http_SetH(req->http, HTTP_HDR_PROTO, "HTTP/2.0");
323
324		/* Wait for PRISM response */
325	10	hs = HTC_RxStuff(h2->htc, H2_prism_complete,
326	5	NULL, NULL, NAN, h2->sess->t_idle + cache_param->timeout_idle, NAN,
327		sizeof H2_prism);
328	5	if (hs != HTC_S_COMPLETE) {
329	1	VSLb(h2->vsl, SLT_Debug, "H2: No/Bad OU PRISM (hs=%d)", hs);
330	1	r2->scheduled = 0;
331	1	h2_del_req(wrk, r2);
332	1	return (0);
333		}
334	4	if (Pool_Task(wrk->pool, req->task, TASK_QUEUE_REQ)) {
335	1	r2->scheduled = 0;
336	1	h2_del_req(wrk, r2);
337	1	VSLb(h2->vsl, SLT_Debug, "H2: No Worker-threads");
338	1	return (0);
339		}
340	3	return (1);
341	7	}
342
343		/**********************************************************************
344		*/
345
346		#define H2_PU_MARKER 1
347		#define H2_OU_MARKER 2
348
349		void
350	147	H2_PU_Sess(struct worker wrk, struct sess sp, struct req *req)
351		{
352	147	VSL(SLT_Debug, sp->vxid, "H2 Prior Knowledge Upgrade");
353	147	req->err_code = H2_PU_MARKER;
354	147	SES_SetTransport(wrk, sp, req, &HTTP2_transport);
355	147	}
356
357		void
358	7	H2_OU_Sess(struct worker wrk, struct sess sp, struct req *req)
359		{
360	7	VSL(SLT_Debug, sp->vxid, "H2 Optimistic Upgrade");
361	7	req->err_code = H2_OU_MARKER;
362	7	SES_SetTransport(wrk, sp, req, &HTTP2_transport);
363	7	}
364
365		static void v_matchproto_(task_func_t)
366	154	h2_new_session(struct worker wrk, void arg)
367		{
368		struct req *req;
369		struct sess *sp;
370		struct h2_sess h2s;
371		struct h2_sess *h2;
372		struct h2_req r2, r22;
373		int again;
374		uint8_t settings[48];
375		struct h2h_decode decode;
376		size_t l;
377
378	154	CHECK_OBJ_NOTNULL(wrk, WORKER_MAGIC);
379	154	CAST_OBJ_NOTNULL(req, arg, REQ_MAGIC);
380	154	sp = req->sp;
381	154	CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);
382
383	154	if (wrk->wpriv->vcl)
384	24	VCL_Rel(&wrk->wpriv->vcl);
385
386	154	assert(req->transport == &HTTP2_transport);
387
388	154	assert (req->err_code == H2_PU_MARKER \|\| req->err_code == H2_OU_MARKER);
389
390	308	h2 = h2_init_sess(sp, &h2s,
391	154	req->err_code == H2_PU_MARKER ? req : NULL, &decode);
392	154	h2->req0 = h2_new_req(h2, 0, NULL);
393	154	AZ(h2->htc->priv);
394	154	h2->htc->priv = h2;
395
396	154	AZ(wrk->vsl);
397	154	wrk->vsl = h2->vsl;
398
399	154	if (req->err_code == H2_OU_MARKER && !h2_ou_session(wrk, h2, req)) {
400	4	assert(h2->refcnt == 1);
401	4	h2_del_req(wrk, h2->req0);
402	4	h2_del_sess(wrk, h2, SC_RX_JUNK);
403	4	wrk->vsl = NULL;
404	4	return;
405		}
406	150	assert(HTC_S_COMPLETE == H2_prism_complete(h2->htc));
407	150	HTC_RxPipeline(h2->htc, h2->htc->rxbuf_b + sizeof(H2_prism));
408	150	HTC_RxInit(h2->htc, h2->ws);
409	150	AN(WS_Reservation(h2->ws));
410	150	VSLb(h2->vsl, SLT_Debug, "H2: Got pu PRISM");
411
412	150	THR_SetRequest(h2->srq);
413	150	AN(WS_Reservation(h2->ws));
414
415	150	l = h2_enc_settings(&h2->local_settings, settings, sizeof (settings));
416	150	AN(WS_Reservation(h2->ws));
417	150	H2_Send_Get(wrk, h2, h2->req0);
418	150	AN(WS_Reservation(h2->ws));
419	300	H2_Send_Frame(wrk, h2,
420	150	H2_F_SETTINGS, H2FF_NONE, l, 0, settings);
421	150	AN(WS_Reservation(h2->ws));
422	150	H2_Send_Rel(h2, h2->req0);
423	150	AN(WS_Reservation(h2->ws));
424
425		/* and off we go... */
426	150	h2->cond = &wrk->cond;
427
428	1085	while (h2_rxframe(wrk, h2)) {
429	935	HTC_RxInit(h2->htc, h2->ws);
430	935	if (WS_Overflowed(h2->ws)) {
431	0	H2S_Lock_VSLb(h2, SLT_SessError, "H2: Empty Rx Workspace");
432	0	h2->error = H2CE_INTERNAL_ERROR;
433	0	break;
434		}
435	935	AN(WS_Reservation(h2->ws));
436		}
437
438	150	AN(h2->error);
439
440		/* Delete all idle streams */
441	150	Lck_Lock(&h2->sess->mtx);
442	150	VSLb(h2->vsl, SLT_Debug, "H2 CLEANUP %s", h2->error->name);
443	412	VTAILQ_FOREACH(r2, &h2->streams, list) {
444	262	if (r2->error == 0)
445	245	r2->error = h2->error;
446	262	if (r2->cond != NULL)
447	4	PTOK(pthread_cond_signal(r2->cond));
448	262	}
449	150	PTOK(pthread_cond_broadcast(h2->winupd_cond));
450	150	Lck_Unlock(&h2->sess->mtx);
451	267	while (1) {
452	267	again = 0;
453	694	VTAILQ_FOREACH_SAFE(r2, &h2->streams, list, r22) {
454	427	if (r2 != h2->req0) {
455	161	h2_kill_req(wrk, h2, r2, h2->error);
456	161	again++;
457	161	}
458	427	}
459	267	if (!again)
460	150	break;
461	117	Lck_Lock(&h2->sess->mtx);
462	282	VTAILQ_FOREACH(r2, &h2->streams, list)
463	330	VSLb(h2->vsl, SLT_Debug, "ST %u %d",
464	165	r2->stream, r2->state);
465	117	(void)Lck_CondWaitTimeout(h2->cond, &h2->sess->mtx, .1);
466	117	Lck_Unlock(&h2->sess->mtx);
467		}
468	150	h2->cond = NULL;
469	150	assert(h2->refcnt == 1);
470	150	h2_del_req(wrk, h2->req0);
471	150	h2_del_sess(wrk, h2, h2->error->reason);
472	150	wrk->vsl = NULL;
473	154	}
474
475		static int v_matchproto_(vtr_poll_f)
476	469	h2_poll(struct req *req)
477		{
478		struct h2_req *r2;
479
480	469	CHECK_OBJ_NOTNULL(req, REQ_MAGIC);
481	469	CAST_OBJ_NOTNULL(r2, req->transport_priv, H2_REQ_MAGIC);
482	469	return (r2->error ? -1 : 1);
483		}
484
485		struct transport HTTP2_transport = {
486		.name = "HTTP/2",
487		.magic = TRANSPORT_MAGIC,
488		.deliver = h2_deliver,
489		.minimal_response = h2_minimal_response,
490		.new_session = h2_new_session,
491		.req_body = h2_req_body,
492		.req_fail = h2_req_fail,
493		.sess_panic = h2_sess_panic,
494		.poll = h2_poll,
495		};