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http2.c
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http2.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#ifdef USE_NGHTTP2
#include <nghttp2/nghttp2.h>
#include "urldata.h"
#include "http2.h"
#include "http.h"
#include "sendf.h"
#include "select.h"
#include "curl_base64.h"
#include "strcase.h"
#include "multiif.h"
#include "url.h"
#include "cfilters.h"
#include "connect.h"
#include "strtoofft.h"
#include "strdup.h"
#include "transfer.h"
#include "dynbuf.h"
#include "h2h3.h"
#include "headers.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
#define H2_BUFSIZE 32768
#if (NGHTTP2_VERSION_NUM < 0x010c00)
#error too old nghttp2 version, upgrade!
#endif
#ifdef CURL_DISABLE_VERBOSE_STRINGS
#define nghttp2_session_callbacks_set_error_callback(x,y)
#endif
#if (NGHTTP2_VERSION_NUM >= 0x010c00)
#define NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE 1
#endif
#define HTTP2_HUGE_WINDOW_SIZE (32 * 1024 * 1024) /* 32 MB */
#define DEBUG_HTTP2
#ifdef DEBUG_HTTP2
#define H2BUGF(x) x
#else
#define H2BUGF(x) do { } while(0)
#endif
#define H2_SETTINGS_IV_LEN 3
#define H2_BINSETTINGS_LEN 80
static int populate_settings(nghttp2_settings_entry *iv,
struct Curl_easy *data)
{
iv[0].settings_id = NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS;
iv[0].value = Curl_multi_max_concurrent_streams(data->multi);
iv[1].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
iv[1].value = HTTP2_HUGE_WINDOW_SIZE;
iv[2].settings_id = NGHTTP2_SETTINGS_ENABLE_PUSH;
iv[2].value = data->multi->push_cb != NULL;
return 3;
}
static size_t populate_binsettings(uint8_t *binsettings,
struct Curl_easy *data)
{
nghttp2_settings_entry iv[H2_SETTINGS_IV_LEN];
int ivlen;
ivlen = populate_settings(iv, data);
/* this returns number of bytes it wrote */
return nghttp2_pack_settings_payload(binsettings, H2_BINSETTINGS_LEN,
iv, ivlen);
}
struct h2_cf_ctx {
nghttp2_session *h2;
uint32_t max_concurrent_streams;
bool enable_push;
/* We associate the connectdata struct with the connection, but we need to
make sure we can identify the current "driving" transfer. This is a
work-around for the lack of nghttp2_session_set_user_data() in older
nghttp2 versions that we want to support. (Added in 1.31.0) */
struct Curl_easy *trnsfr;
char *inbuf; /* buffer to receive data from underlying socket */
size_t inbuflen; /* number of bytes filled in inbuf */
size_t nread_inbuf; /* number of bytes read from in inbuf */
/* We need separate buffer for transmission and reception because we
may call nghttp2_session_send() after the
nghttp2_session_mem_recv() but mem buffer is still not full. In
this case, we wrongly sends the content of mem buffer if we share
them for both cases. */
int32_t pause_stream_id; /* stream ID which paused
nghttp2_session_mem_recv */
size_t drain_total; /* sum of all stream's UrlState.drain */
};
static void h2_cf_ctx_clear(struct h2_cf_ctx *ctx)
{
if(ctx->h2) {
nghttp2_session_del(ctx->h2);
}
free(ctx->inbuf);
memset(ctx, 0, sizeof(*ctx));
}
static void h2_cf_ctx_free(struct h2_cf_ctx *ctx)
{
if(ctx) {
h2_cf_ctx_clear(ctx);
free(ctx);
}
}
static int h2_client_new(struct Curl_cfilter *cf,
nghttp2_session_callbacks *cbs)
{
struct h2_cf_ctx *ctx = cf->ctx;
#if NGHTTP2_VERSION_NUM < 0x013200
/* before 1.50.0 */
return nghttp2_session_client_new(&ctx->h2, cbs, cf);
#else
nghttp2_option *o;
int rc = nghttp2_option_new(&o);
if(rc)
return rc;
/* turn off RFC 9113 leading and trailing white spaces validation against
HTTP field value. */
nghttp2_option_set_no_rfc9113_leading_and_trailing_ws_validation(o, 1);
rc = nghttp2_session_client_new2(&ctx->h2, cbs, cf, o);
nghttp2_option_del(o);
return rc;
#endif
}
static ssize_t send_callback(nghttp2_session *h2,
const uint8_t *mem, size_t length, int flags,
void *userp);
static int on_frame_recv(nghttp2_session *session, const nghttp2_frame *frame,
void *userp);
static int on_data_chunk_recv(nghttp2_session *session, uint8_t flags,
int32_t stream_id,
const uint8_t *mem, size_t len, void *userp);
static int on_stream_close(nghttp2_session *session, int32_t stream_id,
uint32_t error_code, void *userp);
static int on_begin_headers(nghttp2_session *session,
const nghttp2_frame *frame, void *userp);
static int on_header(nghttp2_session *session, const nghttp2_frame *frame,
const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen,
uint8_t flags,
void *userp);
static int error_callback(nghttp2_session *session, const char *msg,
size_t len, void *userp);
/*
* multi_connchanged() is called to tell that there is a connection in
* this multi handle that has changed state (multiplexing become possible, the
* number of allowed streams changed or similar), and a subsequent use of this
* multi handle should move CONNECT_PEND handles back to CONNECT to have them
* retry.
*/
static void multi_connchanged(struct Curl_multi *multi)
{
multi->recheckstate = TRUE;
}
static CURLcode http2_data_setup(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct HTTP *stream = data->req.p.http;
(void)cf;
DEBUGASSERT(stream);
DEBUGASSERT(data->state.buffer);
stream->stream_id = -1;
Curl_dyn_init(&stream->header_recvbuf, DYN_H2_HEADERS);
Curl_dyn_init(&stream->trailer_recvbuf, DYN_H2_TRAILERS);
stream->bodystarted = FALSE;
stream->status_code = -1;
stream->pausedata = NULL;
stream->pauselen = 0;
stream->closed = FALSE;
stream->close_handled = FALSE;
stream->memlen = 0;
stream->error = NGHTTP2_NO_ERROR;
stream->upload_left = 0;
stream->upload_mem = NULL;
stream->upload_len = 0;
stream->mem = data->state.buffer;
stream->len = data->set.buffer_size;
return CURLE_OK;
}
/*
* Initialize the cfilter context
*/
static CURLcode h2_cf_ctx_init(struct Curl_cfilter *cf,
struct Curl_easy *data,
bool via_h1_upgrade)
{
struct h2_cf_ctx *ctx = cf->ctx;
struct HTTP *stream = data->req.p.http;
CURLcode result = CURLE_OUT_OF_MEMORY;
int rc;
nghttp2_session_callbacks *cbs = NULL;
DEBUGASSERT(!ctx->h2);
ctx->inbuf = malloc(H2_BUFSIZE);
if(!ctx->inbuf)
goto out;
rc = nghttp2_session_callbacks_new(&cbs);
if(rc) {
failf(data, "Couldn't initialize nghttp2 callbacks");
goto out;
}
nghttp2_session_callbacks_set_send_callback(cbs, send_callback);
nghttp2_session_callbacks_set_on_frame_recv_callback(cbs, on_frame_recv);
nghttp2_session_callbacks_set_on_data_chunk_recv_callback(
cbs, on_data_chunk_recv);
nghttp2_session_callbacks_set_on_stream_close_callback(cbs, on_stream_close);
nghttp2_session_callbacks_set_on_begin_headers_callback(
cbs, on_begin_headers);
nghttp2_session_callbacks_set_on_header_callback(cbs, on_header);
nghttp2_session_callbacks_set_error_callback(cbs, error_callback);
/* The nghttp2 session is not yet setup, do it */
rc = h2_client_new(cf, cbs);
if(rc) {
failf(data, "Couldn't initialize nghttp2");
goto out;
}
ctx->max_concurrent_streams = DEFAULT_MAX_CONCURRENT_STREAMS;
result = http2_data_setup(cf, data);
if(result)
goto out;
if(via_h1_upgrade) {
/* HTTP/1.1 Upgrade issued. H2 Settings have already been submitted
* in the H1 request and we upgrade from there. This stream
* is opened implicitly as #1. */
uint8_t binsettings[H2_BINSETTINGS_LEN];
size_t binlen; /* length of the binsettings data */
binlen = populate_binsettings(binsettings, data);
stream->stream_id = 1;
/* queue SETTINGS frame (again) */
rc = nghttp2_session_upgrade2(ctx->h2, binsettings, binlen,
data->state.httpreq == HTTPREQ_HEAD,
NULL);
if(rc) {
failf(data, "nghttp2_session_upgrade2() failed: %s(%d)",
nghttp2_strerror(rc), rc);
result = CURLE_HTTP2;
goto out;
}
rc = nghttp2_session_set_stream_user_data(ctx->h2, stream->stream_id,
data);
if(rc) {
infof(data, "http/2: failed to set user_data for stream %u",
stream->stream_id);
DEBUGASSERT(0);
}
}
else {
nghttp2_settings_entry iv[H2_SETTINGS_IV_LEN];
int ivlen;
/* H2 Settings need to be submitted. Stream is not open yet. */
DEBUGASSERT(stream->stream_id == -1);
ivlen = populate_settings(iv, data);
rc = nghttp2_submit_settings(ctx->h2, NGHTTP2_FLAG_NONE,
iv, ivlen);
if(rc) {
failf(data, "nghttp2_submit_settings() failed: %s(%d)",
nghttp2_strerror(rc), rc);
result = CURLE_HTTP2;
goto out;
}
}
rc = nghttp2_session_set_local_window_size(ctx->h2, NGHTTP2_FLAG_NONE, 0,
HTTP2_HUGE_WINDOW_SIZE);
if(rc) {
failf(data, "nghttp2_session_set_local_window_size() failed: %s(%d)",
nghttp2_strerror(rc), rc);
result = CURLE_HTTP2;
goto out;
}
/* all set, traffic will be send on connect */
result = CURLE_OK;
out:
if(cbs)
nghttp2_session_callbacks_del(cbs);
return result;
}
static int h2_session_send(struct Curl_cfilter *cf,
struct Curl_easy *data);
static int h2_process_pending_input(struct Curl_cfilter *cf,
struct Curl_easy *data,
CURLcode *err);
/*
* http2_stream_free() free HTTP2 stream related data
*/
static void http2_stream_free(struct HTTP *stream)
{
if(stream) {
Curl_dyn_free(&stream->header_recvbuf);
for(; stream->push_headers_used > 0; --stream->push_headers_used) {
free(stream->push_headers[stream->push_headers_used - 1]);
}
free(stream->push_headers);
stream->push_headers = NULL;
}
}
/*
* The server may send us data at any point (e.g. PING frames). Therefore,
* we cannot assume that an HTTP/2 socket is dead just because it is readable.
*
* Check the lower filters first and, if successful, peek at the socket
* and distinguish between closed and data.
*/
static bool http2_connisdead(struct Curl_cfilter *cf, struct Curl_easy *data)
{
struct h2_cf_ctx *ctx = cf->ctx;
int sval;
bool dead = TRUE;
if(!cf->next || !cf->next->cft->is_alive(cf->next, data))
return TRUE;
sval = SOCKET_READABLE(cf->conn->sock[cf->sockindex], 0);
if(sval == 0) {
/* timeout */
dead = FALSE;
}
else if(sval & CURL_CSELECT_ERR) {
/* socket is in an error state */
dead = TRUE;
}
else if(sval & CURL_CSELECT_IN) {
/* This happens before we've sent off a request and the connection is
not in use by any other transfer, there shouldn't be any data here,
only "protocol frames" */
CURLcode result;
ssize_t nread = -1;
Curl_attach_connection(data, cf->conn);
nread = Curl_conn_cf_recv(cf->next, data,
ctx->inbuf, H2_BUFSIZE, &result);
dead = FALSE;
if(nread != -1) {
H2BUGF(infof(data,
"%d bytes stray data read before trying h2 connection",
(int)nread));
ctx->nread_inbuf = 0;
ctx->inbuflen = nread;
if(h2_process_pending_input(cf, data, &result) < 0)
/* immediate error, considered dead */
dead = TRUE;
}
else
/* the read failed so let's say this is dead anyway */
dead = TRUE;
Curl_detach_connection(data);
}
return dead;
}
/*
* Set the transfer that is currently using this HTTP/2 connection.
*/
static void set_transfer(struct h2_cf_ctx *ctx,
struct Curl_easy *data)
{
ctx->trnsfr = data;
}
/*
* Get the transfer that is currently using this HTTP/2 connection.
*/
static struct Curl_easy *get_transfer(struct h2_cf_ctx *ctx)
{
DEBUGASSERT(ctx && ctx->trnsfr);
return ctx->trnsfr;
}
static CURLcode http2_send_ping(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct h2_cf_ctx *ctx = cf->ctx;
int rc;
rc = nghttp2_submit_ping(ctx->h2, 0, ZERO_NULL);
if(rc) {
failf(data, "nghttp2_submit_ping() failed: %s(%d)",
nghttp2_strerror(rc), rc);
return CURLE_HTTP2;
}
set_transfer(ctx, data); /* set the transfer */
rc = nghttp2_session_send(ctx->h2);
if(rc) {
failf(data, "nghttp2_session_send() failed: %s(%d)",
nghttp2_strerror(rc), rc);
return CURLE_SEND_ERROR;
}
return CURLE_OK;
}
/*
* Store nghttp2 version info in this buffer.
*/
void Curl_http2_ver(char *p, size_t len)
{
nghttp2_info *h2 = nghttp2_version(0);
(void)msnprintf(p, len, "nghttp2/%s", h2->version_str);
}
/*
* The implementation of nghttp2_send_callback type. Here we write |data| with
* size |length| to the network and return the number of bytes actually
* written. See the documentation of nghttp2_send_callback for the details.
*/
static ssize_t send_callback(nghttp2_session *h2,
const uint8_t *buf, size_t blen, int flags,
void *userp)
{
struct Curl_cfilter *cf = userp;
struct h2_cf_ctx *ctx = cf->ctx;
struct Curl_easy *data = get_transfer(ctx);
ssize_t written;
CURLcode result = CURLE_OK;
(void)h2;
(void)flags;
written = Curl_conn_cf_send(cf->next, data, buf, blen, &result);
if(result == CURLE_AGAIN) {
return NGHTTP2_ERR_WOULDBLOCK;
}
if(written == -1) {
failf(data, "Failed sending HTTP2 data");
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
if(!written)
return NGHTTP2_ERR_WOULDBLOCK;
return written;
}
/* We pass a pointer to this struct in the push callback, but the contents of
the struct are hidden from the user. */
struct curl_pushheaders {
struct Curl_easy *data;
const nghttp2_push_promise *frame;
};
/*
* push header access function. Only to be used from within the push callback
*/
char *curl_pushheader_bynum(struct curl_pushheaders *h, size_t num)
{
/* Verify that we got a good easy handle in the push header struct, mostly to
detect rubbish input fast(er). */
if(!h || !GOOD_EASY_HANDLE(h->data))
return NULL;
else {
struct HTTP *stream = h->data->req.p.http;
if(num < stream->push_headers_used)
return stream->push_headers[num];
}
return NULL;
}
/*
* push header access function. Only to be used from within the push callback
*/
char *curl_pushheader_byname(struct curl_pushheaders *h, const char *header)
{
/* Verify that we got a good easy handle in the push header struct,
mostly to detect rubbish input fast(er). Also empty header name
is just a rubbish too. We have to allow ":" at the beginning of
the header, but header == ":" must be rejected. If we have ':' in
the middle of header, it could be matched in middle of the value,
this is because we do prefix match.*/
if(!h || !GOOD_EASY_HANDLE(h->data) || !header || !header[0] ||
!strcmp(header, ":") || strchr(header + 1, ':'))
return NULL;
else {
struct HTTP *stream = h->data->req.p.http;
size_t len = strlen(header);
size_t i;
for(i = 0; i<stream->push_headers_used; i++) {
if(!strncmp(header, stream->push_headers[i], len)) {
/* sub-match, make sure that it is followed by a colon */
if(stream->push_headers[i][len] != ':')
continue;
return &stream->push_headers[i][len + 1];
}
}
}
return NULL;
}
/*
* This specific transfer on this connection has been "drained".
*/
static void drained_transfer(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct h2_cf_ctx *ctx = cf->ctx;
DEBUGASSERT(ctx->drain_total >= data->state.drain);
ctx->drain_total -= data->state.drain;
data->state.drain = 0;
}
/*
* Mark this transfer to get "drained".
*/
static void drain_this(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct h2_cf_ctx *ctx = cf->ctx;
data->state.drain++;
ctx->drain_total++;
DEBUGASSERT(ctx->drain_total >= data->state.drain);
}
static struct Curl_easy *h2_duphandle(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct Curl_easy *second = curl_easy_duphandle(data);
if(second) {
/* setup the request struct */
struct HTTP *http = calloc(1, sizeof(struct HTTP));
if(!http) {
(void)Curl_close(&second);
}
else {
second->req.p.http = http;
http2_data_setup(cf, second);
second->state.priority.weight = data->state.priority.weight;
}
}
return second;
}
static int set_transfer_url(struct Curl_easy *data,
struct curl_pushheaders *hp)
{
const char *v;
CURLUcode uc;
char *url = NULL;
int rc = 0;
CURLU *u = curl_url();
if(!u)
return 5;
v = curl_pushheader_byname(hp, H2H3_PSEUDO_SCHEME);
if(v) {
uc = curl_url_set(u, CURLUPART_SCHEME, v, 0);
if(uc) {
rc = 1;
goto fail;
}
}
v = curl_pushheader_byname(hp, H2H3_PSEUDO_AUTHORITY);
if(v) {
uc = curl_url_set(u, CURLUPART_HOST, v, 0);
if(uc) {
rc = 2;
goto fail;
}
}
v = curl_pushheader_byname(hp, H2H3_PSEUDO_PATH);
if(v) {
uc = curl_url_set(u, CURLUPART_PATH, v, 0);
if(uc) {
rc = 3;
goto fail;
}
}
uc = curl_url_get(u, CURLUPART_URL, &url, 0);
if(uc)
rc = 4;
fail:
curl_url_cleanup(u);
if(rc)
return rc;
if(data->state.url_alloc)
free(data->state.url);
data->state.url_alloc = TRUE;
data->state.url = url;
return 0;
}
static int push_promise(struct Curl_cfilter *cf,
struct Curl_easy *data,
const nghttp2_push_promise *frame)
{
struct h2_cf_ctx *ctx = cf->ctx;
int rv; /* one of the CURL_PUSH_* defines */
H2BUGF(infof(data, "PUSH_PROMISE received, stream %u",
frame->promised_stream_id));
if(data->multi->push_cb) {
struct HTTP *stream;
struct HTTP *newstream;
struct curl_pushheaders heads;
CURLMcode rc;
size_t i;
/* clone the parent */
struct Curl_easy *newhandle = h2_duphandle(cf, data);
if(!newhandle) {
infof(data, "failed to duplicate handle");
rv = CURL_PUSH_DENY; /* FAIL HARD */
goto fail;
}
heads.data = data;
heads.frame = frame;
/* ask the application */
H2BUGF(infof(data, "Got PUSH_PROMISE, ask application"));
stream = data->req.p.http;
if(!stream) {
failf(data, "Internal NULL stream");
(void)Curl_close(&newhandle);
rv = CURL_PUSH_DENY;
goto fail;
}
rv = set_transfer_url(newhandle, &heads);
if(rv) {
(void)Curl_close(&newhandle);
rv = CURL_PUSH_DENY;
goto fail;
}
Curl_set_in_callback(data, true);
rv = data->multi->push_cb(data, newhandle,
stream->push_headers_used, &heads,
data->multi->push_userp);
Curl_set_in_callback(data, false);
/* free the headers again */
for(i = 0; i<stream->push_headers_used; i++)
free(stream->push_headers[i]);
free(stream->push_headers);
stream->push_headers = NULL;
stream->push_headers_used = 0;
if(rv) {
DEBUGASSERT((rv > CURL_PUSH_OK) && (rv <= CURL_PUSH_ERROROUT));
/* denied, kill off the new handle again */
http2_stream_free(newhandle->req.p.http);
newhandle->req.p.http = NULL;
(void)Curl_close(&newhandle);
goto fail;
}
newstream = newhandle->req.p.http;
newstream->stream_id = frame->promised_stream_id;
newhandle->req.maxdownload = -1;
newhandle->req.size = -1;
/* approved, add to the multi handle and immediately switch to PERFORM
state with the given connection !*/
rc = Curl_multi_add_perform(data->multi, newhandle, cf->conn);
if(rc) {
infof(data, "failed to add handle to multi");
http2_stream_free(newhandle->req.p.http);
newhandle->req.p.http = NULL;
Curl_close(&newhandle);
rv = CURL_PUSH_DENY;
goto fail;
}
rv = nghttp2_session_set_stream_user_data(ctx->h2,
frame->promised_stream_id,
newhandle);
if(rv) {
infof(data, "failed to set user_data for stream %u",
frame->promised_stream_id);
DEBUGASSERT(0);
rv = CURL_PUSH_DENY;
goto fail;
}
Curl_dyn_init(&newstream->header_recvbuf, DYN_H2_HEADERS);
Curl_dyn_init(&newstream->trailer_recvbuf, DYN_H2_TRAILERS);
}
else {
H2BUGF(infof(data, "Got PUSH_PROMISE, ignore it"));
rv = CURL_PUSH_DENY;
}
fail:
return rv;
}
static int on_frame_recv(nghttp2_session *session, const nghttp2_frame *frame,
void *userp)
{
struct Curl_cfilter *cf = userp;
struct h2_cf_ctx *ctx = cf->ctx;
struct Curl_easy *data_s = NULL;
struct HTTP *stream = NULL;
struct Curl_easy *data = get_transfer(ctx);
int rv;
size_t left, ncopy;
int32_t stream_id = frame->hd.stream_id;
CURLcode result;
if(!stream_id) {
/* stream ID zero is for connection-oriented stuff */
DEBUGASSERT(data);
switch(frame->hd.type) {
case NGHTTP2_SETTINGS: {
uint32_t max_conn = ctx->max_concurrent_streams;
H2BUGF(infof(data, CFMSG(cf, "recv frame SETTINGS")));
ctx->max_concurrent_streams = nghttp2_session_get_remote_settings(
session, NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS);
ctx->enable_push = nghttp2_session_get_remote_settings(
session, NGHTTP2_SETTINGS_ENABLE_PUSH);
H2BUGF(infof(data, CFMSG(cf, "MAX_CONCURRENT_STREAMS == %d"),
ctx->max_concurrent_streams));
H2BUGF(infof(data, CFMSG(cf, "ENABLE_PUSH == %s"),
ctx->enable_push?"TRUE":"false"));
if(data && max_conn != ctx->max_concurrent_streams) {
/* only signal change if the value actually changed */
infof(data, CFMSG(cf, "MAX_CONCURRENT_STREAMS now %u"),
ctx->max_concurrent_streams);
multi_connchanged(data->multi);
}
break;
}
case NGHTTP2_GOAWAY:
if(data) {
infof(data, "recveived GOAWAY, error=%d, last_stream=%u",
frame->goaway.error_code, frame->goaway.last_stream_id);
multi_connchanged(data->multi);
}
break;
case NGHTTP2_WINDOW_UPDATE:
H2BUGF(infof(data, CFMSG(cf, "recv frame WINDOW_UPDATE")));
break;
default:
H2BUGF(infof(data, CFMSG(cf, "recv frame %x on 0"), frame->hd.type));
}
return 0;
}
data_s = nghttp2_session_get_stream_user_data(session, stream_id);
if(!data_s) {
H2BUGF(infof(data, CFMSG(cf, "No Curl_easy associated with stream: %u"),
stream_id));
return 0;
}
stream = data_s->req.p.http;
if(!stream) {
H2BUGF(infof(data_s, CFMSG(cf, "No proto pointer for stream: %u"),
stream_id));
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
switch(frame->hd.type) {
case NGHTTP2_DATA:
/* If body started on this stream, then receiving DATA is illegal. */
H2BUGF(infof(data_s, CFMSG(cf, "recv frame DATA stream %u"), stream_id));
if(!stream->bodystarted) {
rv = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE,
stream_id, NGHTTP2_PROTOCOL_ERROR);
if(nghttp2_is_fatal(rv)) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
}
break;
case NGHTTP2_HEADERS:
H2BUGF(infof(data_s, CFMSG(cf, "recv frame HEADERS stream %u"),
stream_id));
if(stream->bodystarted) {
/* Only valid HEADERS after body started is trailer HEADERS. We
buffer them in on_header callback. */
break;
}
/* nghttp2 guarantees that :status is received, and we store it to
stream->status_code. Fuzzing has proven this can still be reached
without status code having been set. */
if(stream->status_code == -1)
return NGHTTP2_ERR_CALLBACK_FAILURE;
/* Only final status code signals the end of header */
if(stream->status_code / 100 != 1) {
stream->bodystarted = TRUE;
stream->status_code = -1;
}
result = Curl_dyn_addn(&stream->header_recvbuf, STRCONST("\r\n"));
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
left = Curl_dyn_len(&stream->header_recvbuf) -
stream->nread_header_recvbuf;
ncopy = CURLMIN(stream->len, left);
memcpy(&stream->mem[stream->memlen],
Curl_dyn_ptr(&stream->header_recvbuf) +
stream->nread_header_recvbuf,
ncopy);
stream->nread_header_recvbuf += ncopy;
DEBUGASSERT(stream->mem);
H2BUGF(infof(data_s, CFMSG(cf, "%zu header bytes, stream %u at %p"),
ncopy, stream_id, stream->mem));
stream->len -= ncopy;
stream->memlen += ncopy;
drain_this(cf, data_s);
/* if we receive data for another handle, wake that up */
if(get_transfer(ctx) != data_s)
Curl_expire(data_s, 0, EXPIRE_RUN_NOW);
break;
case NGHTTP2_PUSH_PROMISE:
H2BUGF(infof(data_s, CFMSG(cf, "recv frame PUSH_PROMISE stream %u"),
stream_id));
rv = push_promise(cf, data_s, &frame->push_promise);
if(rv) { /* deny! */
int h2;
DEBUGASSERT((rv > CURL_PUSH_OK) && (rv <= CURL_PUSH_ERROROUT));
h2 = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE,
frame->push_promise.promised_stream_id,
NGHTTP2_CANCEL);
if(nghttp2_is_fatal(h2))
return NGHTTP2_ERR_CALLBACK_FAILURE;
else if(rv == CURL_PUSH_ERROROUT) {
DEBUGF(infof(data_s, CFMSG(cf, "Fail the parent stream (too)")));
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
}
break;
default:
H2BUGF(infof(data_s, CFMSG(cf, "recv frame %x for stream %u"),
frame->hd.type, stream_id));
break;
}
return 0;
}
static int on_data_chunk_recv(nghttp2_session *session, uint8_t flags,
int32_t stream_id,
const uint8_t *mem, size_t len, void *userp)
{
struct Curl_cfilter *cf = userp;
struct h2_cf_ctx *ctx = cf->ctx;
struct HTTP *stream;
struct Curl_easy *data_s;
size_t nread;
(void)flags;
DEBUGASSERT(stream_id); /* should never be a zero stream ID here */
/* get the stream from the hash based on Stream ID */
data_s = nghttp2_session_get_stream_user_data(session, stream_id);
if(!data_s) {
/* Receiving a Stream ID not in the hash should not happen - unless
we have aborted a transfer artificially and there were more data
in the pipeline. Silently ignore. */
H2BUGF(fprintf(stderr, "Data for stream %u but it doesn't exist\n",
stream_id));
return 0;
}
stream = data_s->req.p.http;
if(!stream)
return NGHTTP2_ERR_CALLBACK_FAILURE;
nread = CURLMIN(stream->len, len);
memcpy(&stream->mem[stream->memlen], mem, nread);
stream->len -= nread;
stream->memlen += nread;
drain_this(cf, data_s);
/* if we receive data for another handle, wake that up */
if(get_transfer(ctx) != data_s)
Curl_expire(data_s, 0, EXPIRE_RUN_NOW);
H2BUGF(infof(data_s, "%zu data received for stream %u "
"(%zu left in buffer %p, total %zu)",
nread, stream_id,
stream->len, stream->mem,
stream->memlen));
if(nread < len) {
stream->pausedata = mem + nread;
stream->pauselen = len - nread;
H2BUGF(infof(data_s, "NGHTTP2_ERR_PAUSE - %zu bytes out of buffer"
", stream %u",
len - nread, stream_id));
ctx->pause_stream_id = stream_id;
return NGHTTP2_ERR_PAUSE;
}
/* pause execution of nghttp2 if we received data for another handle
in order to process them first. */
if(get_transfer(ctx) != data_s) {
ctx->pause_stream_id = stream_id;
return NGHTTP2_ERR_PAUSE;
}
return 0;
}
static int on_stream_close(nghttp2_session *session, int32_t stream_id,
uint32_t error_code, void *userp)
{
struct Curl_cfilter *cf = userp;
struct h2_cf_ctx *ctx = cf->ctx;
struct Curl_easy *data_s;
struct HTTP *stream;
int rv;
(void)session;
(void)stream_id;
if(stream_id) {
/* get the stream from the hash based on Stream ID, stream ID zero is for
connection-oriented stuff */
data_s = nghttp2_session_get_stream_user_data(session, stream_id);
if(!data_s) {
/* We could get stream ID not in the hash. For example, if we
decided to reject stream (e.g., PUSH_PROMISE). */
return 0;
}
H2BUGF(infof(data_s, "on_stream_close(), %s (err %d), stream %u",
nghttp2_http2_strerror(error_code), error_code, stream_id));