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544a7f804d
curl/lib/http2.c
Stefan Eissing 544a7f804d
http2: fix error handling during parallel operations 
RST and connection close were not handled correctly during parallel
transfers, leading to aborted response bodies being reported complete.

Closes #10715
2023-03-10 23:52:53 +01:00

2668 lines
79 KiB
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 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 cf_h2_ctx {
nghttp2_session *h2;
uint32_t max_concurrent_streams;
/* The easy handle used in the current filter call, cleared at return */
struct cf_call_data call_data;
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 */
struct dynbuf outbuf;
/* 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 */
int32_t goaway_error;
int32_t last_stream_id;
BIT(goaway);
BIT(enable_push);
};
/* How to access `call_data` from a cf_h2 filter */
#define CF_CTX_CALL_DATA(cf) \
((struct cf_h2_ctx *)(cf)->ctx)->call_data
static void cf_h2_ctx_clear(struct cf_h2_ctx *ctx)
{
struct cf_call_data save = ctx->call_data;
if(ctx->h2) {
nghttp2_session_del(ctx->h2);
}
free(ctx->inbuf);
Curl_dyn_free(&ctx->outbuf);
memset(ctx, 0, sizeof(*ctx));
ctx->call_data = save;
}
static void cf_h2_ctx_free(struct cf_h2_ctx *ctx)
{
if(ctx) {
cf_h2_ctx_clear(ctx);
free(ctx);
}
}
static int h2_client_new(struct Curl_cfilter *cf,
nghttp2_session_callbacks *cbs)
{
struct cf_h2_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 cf_h2_ctx_init(struct Curl_cfilter *cf,
struct Curl_easy *data,
bool via_h1_upgrade)
{
struct cf_h2_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;
/* we want to aggregate small frames, SETTINGS, PRIO, UPDATES */
Curl_dyn_init(&ctx->outbuf, 4*1024);
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 CURLcode 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;
}
}
/*
* Returns nonzero if current HTTP/2 session should be closed.
*/
static int should_close_session(struct cf_h2_ctx *ctx)
{
return ctx->drain_total == 0 && !nghttp2_session_want_read(ctx->h2) &&
!nghttp2_session_want_write(ctx->h2);
}
/*
* 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_connisalive(struct Curl_cfilter *cf, struct Curl_easy *data,
bool *input_pending)
{
struct cf_h2_ctx *ctx = cf->ctx;
bool alive = TRUE;
*input_pending = FALSE;
if(!cf->next || !cf->next->cft->is_alive(cf->next, data, input_pending))
return FALSE;
if(*input_pending) {
/* 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;
*input_pending = FALSE;
Curl_attach_connection(data, cf->conn);
nread = Curl_conn_cf_recv(cf->next, data,
ctx->inbuf, H2_BUFSIZE, &result);
if(nread != -1) {
DEBUGF(LOG_CF(data, cf, "%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 */
alive = FALSE;
else {
alive = !should_close_session(ctx);
}
}
else {
/* the read failed so let's say this is dead anyway */
alive = FALSE;
}
Curl_detach_connection(data);
}
return alive;
}
static CURLcode http2_send_ping(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_h2_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;
}
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);
}
static CURLcode flush_output(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_h2_ctx *ctx = cf->ctx;
size_t buflen = Curl_dyn_len(&ctx->outbuf);
ssize_t written;
CURLcode result;
if(!buflen)
return CURLE_OK;
DEBUGF(LOG_CF(data, cf, "h2 conn flush %zu bytes", buflen));
written = Curl_conn_cf_send(cf->next, data, Curl_dyn_ptr(&ctx->outbuf),
buflen, &result);
if(written < 0) {
return result;
}
if((size_t)written < buflen) {
Curl_dyn_tail(&ctx->outbuf, buflen - (size_t)written);
return CURLE_AGAIN;
}
else {
Curl_dyn_reset(&ctx->outbuf);
}
return CURLE_OK;
}
/*
* 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 cf_h2_ctx *ctx = cf->ctx;
struct Curl_easy *data = CF_DATA_CURRENT(cf);
ssize_t written;
CURLcode result = CURLE_OK;
size_t buflen = Curl_dyn_len(&ctx->outbuf);
(void)h2;
(void)flags;
DEBUGASSERT(data);
if(blen < 1024 && (buflen + blen + 1 < ctx->outbuf.toobig)) {
result = Curl_dyn_addn(&ctx->outbuf, buf, blen);
if(result) {
failf(data, "Failed to add data to output buffer");
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
return blen;
}
if(buflen) {
/* not adding, flush buffer */
result = flush_output(cf, data);
if(result) {
if(result == CURLE_AGAIN) {
return NGHTTP2_ERR_WOULDBLOCK;
}
failf(data, "Failed sending HTTP2 data");
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
}
DEBUGF(LOG_CF(data, cf, "h2 conn send %zu bytes", blen));
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)
{
if(data->state.drain) {
struct cf_h2_ctx *ctx = cf->ctx;
DEBUGASSERT(ctx->drain_total > 0);
ctx->drain_total--;
data->state.drain = 0;
}
}
/*
* Mark this transfer to get "drained".
*/
static void drain_this(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
if(!data->state.drain) {
struct cf_h2_ctx *ctx = cf->ctx;
data->state.drain = 1;
ctx->drain_total++;
DEBUGASSERT(ctx->drain_total > 0);
}
}
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 cf_h2_ctx *ctx = cf->ctx;
int rv; /* one of the CURL_PUSH_* defines */
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] PUSH_PROMISE received",
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 */
DEBUGF(LOG_CF(data, cf, "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 {
DEBUGF(LOG_CF(data, cf, "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 cf_h2_ctx *ctx = cf->ctx;
struct Curl_easy *data_s = NULL;
struct HTTP *stream = NULL;
struct Curl_easy *data = CF_DATA_CURRENT(cf);
int rv;
size_t left, ncopy;
int32_t stream_id = frame->hd.stream_id;
CURLcode result;
DEBUGASSERT(data);
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;
DEBUGF(LOG_CF(data, 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) != 0;
DEBUGF(LOG_CF(data, cf, "MAX_CONCURRENT_STREAMS == %d",
ctx->max_concurrent_streams));
DEBUGF(LOG_CF(data, 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 */
DEBUGF(LOG_CF(data, cf, "MAX_CONCURRENT_STREAMS now %u",
ctx->max_concurrent_streams));
multi_connchanged(data->multi);
}
break;
}
case NGHTTP2_GOAWAY:
ctx->goaway = TRUE;
ctx->goaway_error = frame->goaway.error_code;
ctx->last_stream_id = frame->goaway.last_stream_id;
if(data) {
infof(data, "recveived GOAWAY, error=%d, last_stream=%u",
ctx->goaway_error, ctx->last_stream_id);
multi_connchanged(data->multi);
}
break;
case NGHTTP2_WINDOW_UPDATE:
DEBUGF(LOG_CF(data, cf, "recv frame WINDOW_UPDATE"));
break;
default:
DEBUGF(LOG_CF(data, 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) {
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] No Curl_easy associated",
stream_id));
return 0;
}
stream = data_s->req.p.http;
if(!stream) {
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] No proto pointer", 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. */
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] recv frame DATA", 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;
}
}
if(frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
/* Stream has ended. If there is pending data, ensure that read
will occur to consume it. */
if(!data->state.drain && stream->memlen) {
drain_this(cf, data_s);
Curl_expire(data, 0, EXPIRE_RUN_NOW);
}
}
break;
case NGHTTP2_HEADERS:
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] recv frame HEADERS", 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);
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] %zu header bytes, at %p",
stream_id, ncopy, (void *)stream->mem));
stream->len -= ncopy;
stream->memlen += ncopy;
drain_this(cf, data_s);
Curl_expire(data_s, 0, EXPIRE_RUN_NOW);
break;
case NGHTTP2_PUSH_PROMISE:
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] recv PUSH_PROMISE", 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(LOG_CF(data_s, cf, "Fail the parent stream (too)"));
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
}
break;
case NGHTTP2_RST_STREAM:
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] recv RST", stream_id));
stream->closed = TRUE;
stream->reset = TRUE;
drain_this(cf, data);
Curl_expire(data, 0, EXPIRE_RUN_NOW);
break;
case NGHTTP2_WINDOW_UPDATE:
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] recv WINDOW_UPDATE", stream_id));
if((data_s->req.keepon & KEEP_SEND_PAUSE) &&
(data_s->req.keepon & KEEP_SEND)) {
data_s->req.keepon &= ~KEEP_SEND_PAUSE;
drain_this(cf, data_s);
Curl_expire(data_s, 0, EXPIRE_RUN_NOW);
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] unpausing after win update",
stream_id));
}
break;
default:
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] recv frame %x",
stream_id, frame->hd.type));
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 cf_h2_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 */
DEBUGASSERT(CF_DATA_CURRENT(cf));
/* 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. */
DEBUGF(LOG_CF(CF_DATA_CURRENT(cf), cf, "[h2sid=%u] Data for unknown",
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;
/* if we receive data for another handle, wake that up */
if(CF_DATA_CURRENT(cf) != data_s) {
drain_this(cf, data_s);
Curl_expire(data_s, 0, EXPIRE_RUN_NOW);
}
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] %zu DATA recvd, "
"(buffer now holds %zu, %zu still free in %p)",
stream_id, nread,
stream->memlen, stream->len, (void *)stream->mem));
if(nread < len) {
stream->pausedata = mem + nread;
stream->pauselen = len - nread;
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] %zu not recvd -> NGHTTP2_ERR_PAUSE",
stream_id, len - nread));
ctx->pause_stream_id = stream_id;
drain_this(cf, data_s);
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 cf_h2_ctx *ctx = cf->ctx;
struct Curl_easy *data_s;
struct HTTP *stream;
int rv;
(void)session;
/* get the stream from the hash based on Stream ID, stream ID zero is for
connection-oriented stuff */
data_s = stream_id?
nghttp2_session_get_stream_user_data(session, stream_id) : NULL;
if(!data_s) {
return 0;
}
stream = data_s->req.p.http;
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] on_stream_close(), %s (err %d)",
stream_id, nghttp2_http2_strerror(error_code), error_code));
if(!stream)
return NGHTTP2_ERR_CALLBACK_FAILURE;
stream->closed = TRUE;
stream->error = error_code;
if(stream->error)
stream->reset = TRUE;
if(CF_DATA_CURRENT(cf) != data_s) {
drain_this(cf, data_s);
Curl_expire(data_s, 0, EXPIRE_RUN_NOW);
}
/* remove `data_s` from the nghttp2 stream */
rv = nghttp2_session_set_stream_user_data(session, stream_id, 0);
if(rv) {
infof(data_s, "http/2: failed to clear user_data for stream %u",
stream_id);
DEBUGASSERT(0);
}
if(stream_id == ctx->pause_stream_id) {
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] closed the pause stream",
stream_id));
ctx->pause_stream_id = 0;
}
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] closed now", stream_id));
return 0;
}
static int on_begin_headers(nghttp2_session *session,
const nghttp2_frame *frame, void *userp)
{
struct Curl_cfilter *cf = userp;
struct HTTP *stream;
struct Curl_easy *data_s = NULL;
(void)cf;
data_s = nghttp2_session_get_stream_user_data(session, frame->hd.stream_id);
if(!data_s) {
return 0;
}
DEBUGF(LOG_CF(data_s, cf, "on_begin_headers() was called"));
if(frame->hd.type != NGHTTP2_HEADERS) {
return 0;
}
stream = data_s->req.p.http;
if(!stream || !stream->bodystarted) {
return 0;
}
return 0;
}
/* Decode HTTP status code. Returns -1 if no valid status code was
decoded. */
static int decode_status_code(const uint8_t *value, size_t len)
{
int i;
int res;
if(len != 3) {
return -1;
}
res = 0;
for(i = 0; i < 3; ++i) {
char c = value[i];
if(c < '0' || c > '9') {
return -1;
}
res *= 10;
res += c - '0';
}
return res;
}
/* frame->hd.type is either NGHTTP2_HEADERS or NGHTTP2_PUSH_PROMISE */
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)
{
struct Curl_cfilter *cf = userp;
struct HTTP *stream;
struct Curl_easy *data_s;
int32_t stream_id = frame->hd.stream_id;
CURLcode result;
(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, this is an
internal error more than anything else! */
return NGHTTP2_ERR_CALLBACK_FAILURE;
stream = data_s->req.p.http;
if(!stream) {
failf(data_s, "Internal NULL stream");
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
/* Store received PUSH_PROMISE headers to be used when the subsequent
PUSH_PROMISE callback comes */
if(frame->hd.type == NGHTTP2_PUSH_PROMISE) {
char *h;
if(!strcmp(H2H3_PSEUDO_AUTHORITY, (const char *)name)) {
/* pseudo headers are lower case */
int rc = 0;
char *check = aprintf("%s:%d", cf->conn->host.name,
cf->conn->remote_port);
if(!check)
/* no memory */
return NGHTTP2_ERR_CALLBACK_FAILURE;
if(!strcasecompare(check, (const char *)value) &&
((cf->conn->remote_port != cf->conn->given->defport) ||
!strcasecompare(cf->conn->host.name, (const char *)value))) {
/* This is push is not for the same authority that was asked for in
* the URL. RFC 7540 section 8.2 says: "A client MUST treat a
* PUSH_PROMISE for which the server is not authoritative as a stream
* error of type PROTOCOL_ERROR."
*/
(void)nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE,
stream_id, NGHTTP2_PROTOCOL_ERROR);
rc = NGHTTP2_ERR_CALLBACK_FAILURE;
}
free(check);
if(rc)
return rc;
}
if(!stream->push_headers) {
stream->push_headers_alloc = 10;
stream->push_headers = malloc(stream->push_headers_alloc *
sizeof(char *));
if(!stream->push_headers)
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
stream->push_headers_used = 0;
}
else if(stream->push_headers_used ==
stream->push_headers_alloc) {
char **headp;
if(stream->push_headers_alloc > 1000) {
/* this is beyond crazy many headers, bail out */
failf(data_s, "Too many PUSH_PROMISE headers");
Curl_safefree(stream->push_headers);
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
stream->push_headers_alloc *= 2;
headp = Curl_saferealloc(stream->push_headers,
stream->push_headers_alloc * sizeof(char *));
if(!headp) {
stream->push_headers = NULL;
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
stream->push_headers = headp;
}
h = aprintf("%s:%s", name, value);
if(h)
stream->push_headers[stream->push_headers_used++] = h;
return 0;
}
if(stream->bodystarted) {
/* This is a trailer */
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] trailer: %.*s: %.*s",
stream->stream_id,
(int)namelen, name,
(int)valuelen, value));
result = Curl_dyn_addf(&stream->trailer_recvbuf,
"%.*s: %.*s\r\n", (int)namelen, name,
(int)valuelen, value);
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
return 0;
}
if(namelen == sizeof(H2H3_PSEUDO_STATUS) - 1 &&
memcmp(H2H3_PSEUDO_STATUS, name, namelen) == 0) {
/* nghttp2 guarantees :status is received first and only once, and
value is 3 digits status code, and decode_status_code always
succeeds. */
char buffer[32];
stream->status_code = decode_status_code(value, valuelen);
DEBUGASSERT(stream->status_code != -1);
msnprintf(buffer, sizeof(buffer), H2H3_PSEUDO_STATUS ":%u\r",
stream->status_code);
result = Curl_headers_push(data_s, buffer, CURLH_PSEUDO);
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
result = Curl_dyn_addn(&stream->header_recvbuf, STRCONST("HTTP/2 "));
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
result = Curl_dyn_addn(&stream->header_recvbuf, value, valuelen);
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
/* the space character after the status code is mandatory */
result = Curl_dyn_addn(&stream->header_recvbuf, STRCONST(" \r\n"));
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
/* if we receive data for another handle, wake that up */
if(CF_DATA_CURRENT(cf) != data_s)
Curl_expire(data_s, 0, EXPIRE_RUN_NOW);
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] status: HTTP/2 %03d",
stream->stream_id, stream->status_code));
return 0;
}
/* nghttp2 guarantees that namelen > 0, and :status was already
received, and this is not pseudo-header field . */
/* convert to an HTTP1-style header */
result = Curl_dyn_addn(&stream->header_recvbuf, name, namelen);
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
result = Curl_dyn_addn(&stream->header_recvbuf, STRCONST(": "));
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
result = Curl_dyn_addn(&stream->header_recvbuf, value, valuelen);
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
result = Curl_dyn_addn(&stream->header_recvbuf, STRCONST("\r\n"));
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
/* if we receive data for another handle, wake that up */
if(CF_DATA_CURRENT(cf) != data_s)
Curl_expire(data_s, 0, EXPIRE_RUN_NOW);
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] header: %.*s: %.*s",
stream->stream_id,
(int)namelen, name,
(int)valuelen, value));
return 0; /* 0 is successful */
}
static ssize_t data_source_read_callback(nghttp2_session *session,
int32_t stream_id,
uint8_t *buf, size_t length,
uint32_t *data_flags,
nghttp2_data_source *source,
void *userp)
{
struct Curl_cfilter *cf = userp;
struct Curl_easy *data_s;
struct HTTP *stream = NULL;
size_t nread;
(void)source;
(void)cf;
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)
/* Receiving a Stream ID not in the hash should not happen, this is an
internal error more than anything else! */
return NGHTTP2_ERR_CALLBACK_FAILURE;
stream = data_s->req.p.http;
if(!stream)
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
else
return NGHTTP2_ERR_INVALID_ARGUMENT;
nread = CURLMIN(stream->upload_len, length);
if(nread > 0) {
memcpy(buf, stream->upload_mem, nread);
stream->upload_mem += nread;
stream->upload_len -= nread;
if(data_s->state.infilesize != -1)
stream->upload_left -= nread;
}
if(stream->upload_left == 0)
*data_flags = NGHTTP2_DATA_FLAG_EOF;
else if(nread == 0)
return NGHTTP2_ERR_DEFERRED;
DEBUGF(LOG_CF(data_s, cf, "[h2sid=%u] data_source_read_callback: "
"returns %zu bytes", stream_id, nread));
return nread;
}
#if !defined(CURL_DISABLE_VERBOSE_STRINGS)
static int error_callback(nghttp2_session *session,
const char *msg,
size_t len,
void *userp)
{
(void)session;
(void)msg;
(void)len;
(void)userp;
return 0;
}
#endif
static void http2_data_done(struct Curl_cfilter *cf,
struct Curl_easy *data, bool premature)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct HTTP *stream = data->req.p.http;
/* there might be allocated resources done before this got the 'h2' pointer
setup */
Curl_dyn_free(&stream->header_recvbuf);
Curl_dyn_free(&stream->trailer_recvbuf);
if(stream->push_headers) {
/* if they weren't used and then freed before */
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;
}
if(!ctx || !ctx->h2)
return;
/* do this before the reset handling, as that might clear ->stream_id */
if(stream->stream_id && stream->stream_id == ctx->pause_stream_id) {
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] DONE, the pause stream",
stream->stream_id));
ctx->pause_stream_id = 0;
}
(void)premature;
if(!stream->closed && stream->stream_id) {
/* RST_STREAM */
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] RST", stream->stream_id));
if(!nghttp2_submit_rst_stream(ctx->h2, NGHTTP2_FLAG_NONE,
stream->stream_id, NGHTTP2_STREAM_CLOSED))
(void)nghttp2_session_send(ctx->h2);
}
if(data->state.drain)
drained_transfer(cf, data);
/* -1 means unassigned and 0 means cleared */
if(nghttp2_session_get_stream_user_data(ctx->h2, stream->stream_id)) {
int rv = nghttp2_session_set_stream_user_data(ctx->h2,
stream->stream_id, 0);
if(rv) {
infof(data, "http/2: failed to clear user_data for stream %u",
stream->stream_id);
DEBUGASSERT(0);
}
}
}
/*
* Append headers to ask for an HTTP1.1 to HTTP2 upgrade.
*/
CURLcode Curl_http2_request_upgrade(struct dynbuf *req,
struct Curl_easy *data)
{
CURLcode result;
char *base64;
size_t blen;
struct SingleRequest *k = &data->req;
uint8_t binsettings[H2_BINSETTINGS_LEN];
size_t binlen; /* length of the binsettings data */
binlen = populate_binsettings(binsettings, data);
if(binlen <= 0) {
failf(data, "nghttp2 unexpectedly failed on pack_settings_payload");
Curl_dyn_free(req);
return CURLE_FAILED_INIT;
}
result = Curl_base64url_encode((const char *)binsettings, binlen,
&base64, &blen);
if(result) {
Curl_dyn_free(req);
return result;
}
result = Curl_dyn_addf(req,
"Connection: Upgrade, HTTP2-Settings\r\n"
"Upgrade: %s\r\n"
"HTTP2-Settings: %s\r\n",
NGHTTP2_CLEARTEXT_PROTO_VERSION_ID, base64);
free(base64);
k->upgr101 = UPGR101_H2;
return result;
}
/*
* h2_process_pending_input() processes pending input left in
* httpc->inbuf. Then, call h2_session_send() to send pending data.
* This function returns 0 if it succeeds, or -1 and error code will
* be assigned to *err.
*/
static int h2_process_pending_input(struct Curl_cfilter *cf,
struct Curl_easy *data,
CURLcode *err)
{
struct cf_h2_ctx *ctx = cf->ctx;
ssize_t nread;
ssize_t rv;
nread = ctx->inbuflen - ctx->nread_inbuf;
if(nread) {
char *inbuf = ctx->inbuf + ctx->nread_inbuf;
rv = nghttp2_session_mem_recv(ctx->h2, (const uint8_t *)inbuf, nread);
if(rv < 0) {
failf(data,
"h2_process_pending_input: nghttp2_session_mem_recv() returned "
"%zd:%s", rv, nghttp2_strerror((int)rv));
*err = CURLE_RECV_ERROR;
return -1;
}
if(nread == rv) {
DEBUGF(LOG_CF(data, cf, "all data in connection buffer processed"));
ctx->inbuflen = 0;
ctx->nread_inbuf = 0;
}
else {
ctx->nread_inbuf += rv;
DEBUGF(LOG_CF(data, cf, "h2_process_pending_input: %zu bytes left "
"in connection buffer",
ctx->inbuflen - ctx->nread_inbuf));
}
}
rv = h2_session_send(cf, data);
if(rv) {
*err = CURLE_SEND_ERROR;
return -1;
}
if(nghttp2_session_check_request_allowed(ctx->h2) == 0) {
/* No more requests are allowed in the current session, so
the connection may not be reused. This is set when a
GOAWAY frame has been received or when the limit of stream
identifiers has been reached. */
connclose(cf->conn, "http/2: No new requests allowed");
}
if(should_close_session(ctx)) {
struct HTTP *stream = data->req.p.http;
DEBUGF(LOG_CF(data, cf,
"h2_process_pending_input: nothing to do in this session"));
if(stream->reset)
*err = CURLE_PARTIAL_FILE;
else if(stream->error)
*err = CURLE_HTTP2;
else {
/* not an error per se, but should still close the connection */
connclose(cf->conn, "GOAWAY received");
*err = CURLE_OK;
}
return -1;
}
return 0;
}
static CURLcode http2_data_done_send(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_h2_ctx *ctx = cf->ctx;
CURLcode result = CURLE_OK;
struct HTTP *stream = data->req.p.http;
if(!ctx || !ctx->h2)
goto out;
if(stream->upload_left) {
/* If the stream still thinks there's data left to upload. */
stream->upload_left = 0; /* DONE! */
/* resume sending here to trigger the callback to get called again so
that it can signal EOF to nghttp2 */
(void)nghttp2_session_resume_data(ctx->h2, stream->stream_id);
(void)h2_process_pending_input(cf, data, &result);
}
/* If nghttp2 still has pending frames unsent */
if(nghttp2_session_want_write(ctx->h2)) {
struct SingleRequest *k = &data->req;
int rv;
DEBUGF(LOG_CF(data, cf, "HTTP/2 still wants to send data"));
/* and attempt to send the pending frames */
rv = h2_session_send(cf, data);
if(rv)
result = CURLE_SEND_ERROR;
if(nghttp2_session_want_write(ctx->h2)) {
/* re-set KEEP_SEND to make sure we are called again */
k->keepon |= KEEP_SEND;
}
}
out:
return result;
}
static ssize_t http2_handle_stream_close(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct HTTP *stream, CURLcode *err)
{
struct cf_h2_ctx *ctx = cf->ctx;
if(ctx->pause_stream_id == stream->stream_id) {
ctx->pause_stream_id = 0;
}
drained_transfer(cf, data);
if(ctx->pause_stream_id == 0) {
if(h2_process_pending_input(cf, data, err) != 0) {
return -1;
}
}
if(stream->error == NGHTTP2_REFUSED_STREAM) {
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] REFUSED_STREAM, try again on a new "
"connection", stream->stream_id));
connclose(cf->conn, "REFUSED_STREAM"); /* don't use this anymore */
data->state.refused_stream = TRUE;
*err = CURLE_RECV_ERROR; /* trigger Curl_retry_request() later */
return -1;
}
else if(stream->error != NGHTTP2_NO_ERROR) {
failf(data, "HTTP/2 stream %u was not closed cleanly: %s (err %u)",
stream->stream_id, nghttp2_http2_strerror(stream->error),
stream->error);
*err = CURLE_HTTP2_STREAM;
return -1;
}
else if(stream->reset) {
failf(data, "HTTP/2 stream %u was reset", stream->stream_id);
*err = stream->bodystarted? CURLE_PARTIAL_FILE : CURLE_RECV_ERROR;
return -1;
}
if(!stream->bodystarted) {
failf(data, "HTTP/2 stream %u was closed cleanly, but before getting "
" all response header fields, treated as error",
stream->stream_id);
*err = CURLE_HTTP2_STREAM;
return -1;
}
if(Curl_dyn_len(&stream->trailer_recvbuf)) {
char *trailp = Curl_dyn_ptr(&stream->trailer_recvbuf);
char *lf;
do {
size_t len = 0;
CURLcode result;
/* each trailer line ends with a newline */
lf = strchr(trailp, '\n');
if(!lf)
break;
len = lf + 1 - trailp;
Curl_debug(data, CURLINFO_HEADER_IN, trailp, len);
/* pass the trailers one by one to the callback */
result = Curl_client_write(data, CLIENTWRITE_HEADER, trailp, len);
if(result) {
*err = result;
return -1;
}
trailp = ++lf;
} while(lf);
}
stream->close_handled = TRUE;
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] closed cleanly", stream->stream_id));
return 0;
}
static int sweight_wanted(const struct Curl_easy *data)
{
/* 0 weight is not set by user and we take the nghttp2 default one */
return data->set.priority.weight?
data->set.priority.weight : NGHTTP2_DEFAULT_WEIGHT;
}
static int sweight_in_effect(const struct Curl_easy *data)
{
/* 0 weight is not set by user and we take the nghttp2 default one */
return data->state.priority.weight?
data->state.priority.weight : NGHTTP2_DEFAULT_WEIGHT;
}
/*
* h2_pri_spec() fills in the pri_spec struct, used by nghttp2 to send weight
* and dependency to the peer. It also stores the updated values in the state
* struct.
*/
static void h2_pri_spec(struct Curl_easy *data,
nghttp2_priority_spec *pri_spec)
{
struct Curl_data_priority *prio = &data->set.priority;
struct HTTP *depstream = (prio->parent?
prio->parent->req.p.http:NULL);
int32_t depstream_id = depstream? depstream->stream_id:0;
nghttp2_priority_spec_init(pri_spec, depstream_id,
sweight_wanted(data),
data->set.priority.exclusive);
data->state.priority = *prio;
}
/*
* h2_session_send() checks if there's been an update in the priority /
* dependency settings and if so it submits a PRIORITY frame with the updated
* info.
*/
static CURLcode h2_session_send(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct HTTP *stream = data->req.p.http;
int rv = 0;
if((sweight_wanted(data) != sweight_in_effect(data)) ||
(data->set.priority.exclusive != data->state.priority.exclusive) ||
(data->set.priority.parent != data->state.priority.parent) ) {
/* send new weight and/or dependency */
nghttp2_priority_spec pri_spec;
h2_pri_spec(data, &pri_spec);
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] Queuing PRIORITY",
stream->stream_id));
DEBUGASSERT(stream->stream_id != -1);
rv = nghttp2_submit_priority(ctx->h2, NGHTTP2_FLAG_NONE,
stream->stream_id, &pri_spec);
if(rv)
goto out;
}
rv = nghttp2_session_send(ctx->h2);
out:
if(nghttp2_is_fatal(rv)) {
DEBUGF(LOG_CF(data, cf, "nghttp2_session_send error (%s)%d",
nghttp2_strerror(rv), rv));
return CURLE_SEND_ERROR;
}
return flush_output(cf, data);
}
static ssize_t cf_h2_recv(struct Curl_cfilter *cf, struct Curl_easy *data,
char *buf, size_t len, CURLcode *err)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct HTTP *stream = data->req.p.http;
ssize_t nread = -1;
struct cf_call_data save;
bool conn_is_closed = FALSE;
CF_DATA_SAVE(save, cf, data);
/* If the h2 session has told us to GOAWAY with an error AND
* indicated the highest stream id it has processes AND
* the stream we are trying to read has a higher id, this
* means we will most likely not receive any more for it.
* Treat this as if the server explicitly had RST the stream */
if((ctx->goaway && ctx->goaway_error &&
ctx->last_stream_id > 0 &&
ctx->last_stream_id < stream->stream_id)) {
stream->reset = TRUE;
}
/* If a stream is RST, it does not matter what state the h2 session
* is in, our answer to receiving data is always the same. */
if(stream->reset) {
*err = stream->bodystarted? CURLE_PARTIAL_FILE : CURLE_RECV_ERROR;
nread = -1;
goto out;
}
if(should_close_session(ctx)) {
DEBUGF(LOG_CF(data, cf, "http2_recv: nothing to do in this session"));
if(cf->conn->bits.close) {
/* already marked for closure, return OK and we're done */
drained_transfer(cf, data);
*err = CURLE_OK;
nread = 0;
goto out;
}
*err = CURLE_HTTP2;
nread = -1;
goto out;
}
/* Nullify here because we call nghttp2_session_send() and they
might refer to the old buffer. */
stream->upload_mem = NULL;
stream->upload_len = 0;
/*
* At this point 'stream' is just in the Curl_easy the connection
* identifies as its owner at this time.
*/
if(stream->bodystarted &&
stream->nread_header_recvbuf < Curl_dyn_len(&stream->header_recvbuf)) {
/* If there is header data pending for this stream to return, do that */
size_t left =
Curl_dyn_len(&stream->header_recvbuf) - stream->nread_header_recvbuf;
size_t ncopy = CURLMIN(len, left);
memcpy(buf, Curl_dyn_ptr(&stream->header_recvbuf) +
stream->nread_header_recvbuf, ncopy);
stream->nread_header_recvbuf += ncopy;
DEBUGF(LOG_CF(data, cf, "recv: Got %d bytes from header_recvbuf",
(int)ncopy));
nread = ncopy;
goto out;
}
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] cf_recv: win %u/%u",
stream->stream_id,
nghttp2_session_get_local_window_size(ctx->h2),
nghttp2_session_get_stream_local_window_size(ctx->h2,
stream->stream_id)
));
if(stream->memlen) {
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] recv: DRAIN %zu bytes (%p => %p)",
stream->stream_id, stream->memlen,
(void *)stream->mem, (void *)buf));
if(buf != stream->mem) {
/* if we didn't get the same buffer this time, we must move the data to
the beginning */
memmove(buf, stream->mem, stream->memlen);
stream->len = len - stream->memlen;
stream->mem = buf;
}
if(ctx->pause_stream_id == stream->stream_id && !stream->pausedata) {
/* We have paused nghttp2, but we have no pause data (see
on_data_chunk_recv). */
ctx->pause_stream_id = 0;
if(h2_process_pending_input(cf, data, err) != 0) {
nread = -1;
goto out;
}
}
}
else if(stream->pausedata) {
DEBUGASSERT(ctx->pause_stream_id == stream->stream_id);
nread = CURLMIN(len, stream->pauselen);
memcpy(buf, stream->pausedata, nread);
stream->pausedata += nread;
stream->pauselen -= nread;
drain_this(cf, data);
if(stream->pauselen == 0) {
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] Unpaused", stream->stream_id));
DEBUGASSERT(ctx->pause_stream_id == stream->stream_id);
ctx->pause_stream_id = 0;
stream->pausedata = NULL;
stream->pauselen = 0;
}
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] recv: returns unpaused %zd bytes",
stream->stream_id, nread));
goto out;
}
else if(ctx->pause_stream_id) {
/* If a stream paused nghttp2_session_mem_recv previously, and has
not processed all data, it still refers to the buffer in
nghttp2_session. If we call nghttp2_session_mem_recv(), we may
overwrite that buffer. To avoid that situation, just return
here with CURLE_AGAIN. This could be busy loop since data in
socket is not read. But it seems that usually streams are
notified with its drain property, and socket is read again
quickly. */
if(stream->closed) {
/* closed overrides paused */
drained_transfer(cf, data);
nread = 0;
goto out;
}
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] is paused, pause h2sid: %u",
stream->stream_id, ctx->pause_stream_id));
*err = CURLE_AGAIN;
nread = -1;
goto out;
}
else {
/* We have nothing buffered for `data` and no other stream paused
* the processing of incoming data, we can therefore read new data
* from the network.
* If DATA is coming for this stream, we want to store it ad the
* `buf` passed in right away - saving us a copy.
*/
stream->mem = buf;
stream->len = len;
stream->memlen = 0;
if(ctx->inbuflen > 0) {
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] %zd bytes in inbuf",
stream->stream_id, ctx->inbuflen - ctx->nread_inbuf));
if(h2_process_pending_input(cf, data, err))
return -1;
}
while(stream->memlen == 0 && /* have no data for this stream */
!stream->closed && /* and it is not closed/reset */
!ctx->pause_stream_id && /* we are not paused either */
ctx->inbuflen == 0 && /* and out input buffer is empty */
!conn_is_closed) { /* and connection is not closed */
/* Receive data from the "lower" filters */
nread = Curl_conn_cf_recv(cf->next, data, ctx->inbuf, H2_BUFSIZE, err);
if(nread < 0) {
DEBUGASSERT(*err);
if(*err == CURLE_AGAIN) {
break;
}
failf(data, "Failed receiving HTTP2 data");
conn_is_closed = TRUE;
}
else if(nread == 0) {
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] underlying connection is closed",
stream->stream_id));
conn_is_closed = TRUE;
}
else {
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] read %zd from connection",
stream->stream_id, nread));
ctx->inbuflen = nread;
DEBUGASSERT(ctx->nread_inbuf == 0);
if(h2_process_pending_input(cf, data, err))
return -1;
}
}
}
if(stream->memlen) {
ssize_t retlen = stream->memlen;
/* TODO: all this buffer handling is very brittle */
stream->len += stream->memlen;
stream->memlen = 0;
if(ctx->pause_stream_id == stream->stream_id) {
/* data for this stream is returned now, but this stream caused a pause
already so we need it called again asap */
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] Data returned for PAUSED stream",
stream->stream_id));
drain_this(cf, data);
Curl_expire(data, 0, EXPIRE_RUN_NOW);
}
else if(stream->closed) {
if(stream->reset || stream->error) {
nread = http2_handle_stream_close(cf, data, stream, err);
goto out;
}
/* this stream is closed, trigger a another read ASAP to detect that */
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] is closed now, run again",
stream->stream_id));
drain_this(cf, data);
Curl_expire(data, 0, EXPIRE_RUN_NOW);
}
else {
drained_transfer(cf, data);
}
*err = CURLE_OK;
nread = retlen;
goto out;
}
if(conn_is_closed && !stream->closed) {
/* underlying connection is closed and we have nothing for the stream.
* Treat this as a RST */
stream->closed = stream->reset = TRUE;
failf(data, "HTTP/2 stream %u was not closed cleanly before"
" end of the underlying connection",
stream->stream_id);
}
if(stream->closed) {
nread = http2_handle_stream_close(cf, data, stream, err);
goto out;
}
if(!data->state.drain && Curl_conn_cf_data_pending(cf->next, data)) {
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] pending data, set drain",
stream->stream_id));
drain_this(cf, data);
}
*err = CURLE_AGAIN;
nread = -1;
out:
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] cf_recv -> %zd, %d",
stream->stream_id, nread, *err));
CF_DATA_RESTORE(cf, save);
return nread;
}
static ssize_t cf_h2_send(struct Curl_cfilter *cf, struct Curl_easy *data,
const void *buf, size_t len, CURLcode *err)
{
/*
* Currently, we send request in this function, but this function is also
* used to send request body. It would be nice to add dedicated function for
* request.
*/
struct cf_h2_ctx *ctx = cf->ctx;
int rv;
struct HTTP *stream = data->req.p.http;
nghttp2_nv *nva = NULL;
size_t nheader;
nghttp2_data_provider data_prd;
int32_t stream_id;
nghttp2_priority_spec pri_spec;
CURLcode result;
struct h2h3req *hreq;
struct cf_call_data save;
ssize_t nwritten;
CF_DATA_SAVE(save, cf, data);
DEBUGF(LOG_CF(data, cf, "cf_send(len=%zu) start", len));
if(stream->stream_id != -1) {
if(stream->close_handled) {
infof(data, "stream %u closed", stream->stream_id);
*err = CURLE_HTTP2_STREAM;
nwritten = -1;
goto out;
}
else if(stream->closed) {
nwritten = http2_handle_stream_close(cf, data, stream, err);
goto out;
}
/* If stream_id != -1, we have dispatched request HEADERS, and now
are going to send or sending request body in DATA frame */
stream->upload_mem = buf;
stream->upload_len = len;
rv = nghttp2_session_resume_data(ctx->h2, stream->stream_id);
if(nghttp2_is_fatal(rv)) {
*err = CURLE_SEND_ERROR;
nwritten = -1;
goto out;
}
result = h2_session_send(cf, data);
if(result) {
*err = result;
nwritten = -1;
goto out;
}
nwritten = (ssize_t)len - (ssize_t)stream->upload_len;
stream->upload_mem = NULL;
stream->upload_len = 0;
if(should_close_session(ctx)) {
DEBUGF(LOG_CF(data, cf, "send: nothing to do in this session"));
*err = CURLE_HTTP2;
nwritten = -1;
goto out;
}
if(stream->upload_left) {
/* we are sure that we have more data to send here. Calling the
following API will make nghttp2_session_want_write() return
nonzero if remote window allows it, which then libcurl checks
socket is writable or not. See http2_perform_getsock(). */
nghttp2_session_resume_data(ctx->h2, stream->stream_id);
}
if(!nwritten) {
size_t rwin = nghttp2_session_get_stream_remote_window_size(ctx->h2,
stream->stream_id);
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] cf_send: win %u/%zu",
stream->stream_id,
nghttp2_session_get_remote_window_size(ctx->h2), rwin));
if(rwin == 0) {
/* We cannot upload more as the stream's remote window size
* is 0. We need to receive WIN_UPDATEs before we can continue.
*/
data->req.keepon |= KEEP_SEND_PAUSE;
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] pausing send as remote flow "
"window is exhausted", stream->stream_id));
}
}
DEBUGF(LOG_CF(data, cf, "[h2sid=%u] cf_send returns %zd ",
stream->stream_id, nwritten));
/* handled writing BODY for open stream. */
goto out;
}
/* Stream has not been opened yet. `buf` is expected to contain
* request headers. */
/* TODO: this assumes that the `buf` and `len` we are called with
* is *all* HEADERs and no body. We have no way to determine here
* if that is indeed the case. */
result = Curl_pseudo_headers(data, buf, len, NULL, &hreq);
if(result) {
*err = result;
nwritten = -1;
goto out;
}
nheader = hreq->entries;
nva = malloc(sizeof(nghttp2_nv) * nheader);
if(!nva) {
Curl_pseudo_free(hreq);
*err = CURLE_OUT_OF_MEMORY;
nwritten = -1;
goto out;
}
else {
unsigned int i;
for(i = 0; i < nheader; i++) {
nva[i].name = (unsigned char *)hreq->header[i].name;
nva[i].namelen = hreq->header[i].namelen;
nva[i].value = (unsigned char *)hreq->header[i].value;
nva[i].valuelen = hreq->header[i].valuelen;
nva[i].flags = NGHTTP2_NV_FLAG_NONE;
}
Curl_pseudo_free(hreq);
}
h2_pri_spec(data, &pri_spec);
DEBUGF(LOG_CF(data, cf, "send request allowed %d (easy handle %p)",
nghttp2_session_check_request_allowed(ctx->h2), (void *)data));
switch(data->state.httpreq) {
case HTTPREQ_POST:
case HTTPREQ_POST_FORM:
case HTTPREQ_POST_MIME:
case HTTPREQ_PUT:
if(data->state.infilesize != -1)
stream->upload_left = data->state.infilesize;
else
/* data sending without specifying the data amount up front */
stream->upload_left = -1; /* unknown, but not zero */
data_prd.read_callback = data_source_read_callback;
data_prd.source.ptr = NULL;
stream_id = nghttp2_submit_request(ctx->h2, &pri_spec, nva, nheader,
&data_prd, data);
break;
default:
stream_id = nghttp2_submit_request(ctx->h2, &pri_spec, nva, nheader,
NULL, data);
}
Curl_safefree(nva);
if(stream_id < 0) {
DEBUGF(LOG_CF(data, cf, "send: nghttp2_submit_request error (%s)%u",
nghttp2_strerror(stream_id), stream_id));
*err = CURLE_SEND_ERROR;
nwritten = -1;
goto out;
}
infof(data, "Using Stream ID: %u (easy handle %p)",
stream_id, (void *)data);
stream->stream_id = stream_id;
/* See TODO above. We assume that the whole buf was consumed by
* generating the request headers. */
nwritten = len;
result = h2_session_send(cf, data);
if(result) {
*err = result;
nwritten = -1;
goto out;
}
if(should_close_session(ctx)) {
DEBUGF(LOG_CF(data, cf, "send: nothing to do in this session"));
*err = CURLE_HTTP2;
nwritten = -1;
goto out;
}
/* If whole HEADERS frame was sent off to the underlying socket, the nghttp2
library calls data_source_read_callback. But only it found that no data
available, so it deferred the DATA transmission. Which means that
nghttp2_session_want_write() returns 0 on http2_perform_getsock(), which
results that no writable socket check is performed. To workaround this,
we issue nghttp2_session_resume_data() here to bring back DATA
transmission from deferred state. */
nghttp2_session_resume_data(ctx->h2, stream->stream_id);
out:
CF_DATA_RESTORE(cf, save);
return nwritten;
}
static int cf_h2_get_select_socks(struct Curl_cfilter *cf,
struct Curl_easy *data,
curl_socket_t *sock)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct SingleRequest *k = &data->req;
struct HTTP *stream = data->req.p.http;
int bitmap = GETSOCK_BLANK;
struct cf_call_data save;
CF_DATA_SAVE(save, cf, data);
sock[0] = Curl_conn_cf_get_socket(cf, data);
if(!(k->keepon & KEEP_RECV_PAUSE))
/* Unless paused - in an HTTP/2 connection we can basically always get a
frame so we should always be ready for one */
bitmap |= GETSOCK_READSOCK(0);
/* we're (still uploading OR the HTTP/2 layer wants to send data) AND
there's a window to send data in */
if((((k->keepon & (KEEP_SEND|KEEP_SEND_PAUSE)) == KEEP_SEND) ||
nghttp2_session_want_write(ctx->h2)) &&
(nghttp2_session_get_remote_window_size(ctx->h2) &&
nghttp2_session_get_stream_remote_window_size(ctx->h2,
stream->stream_id)))
bitmap |= GETSOCK_WRITESOCK(0);
CF_DATA_RESTORE(cf, save);
return bitmap;
}
static CURLcode cf_h2_connect(struct Curl_cfilter *cf,
struct Curl_easy *data,
bool blocking, bool *done)
{
struct cf_h2_ctx *ctx = cf->ctx;
CURLcode result = CURLE_OK;
struct cf_call_data save;
if(cf->connected) {
*done = TRUE;
return CURLE_OK;
}
/* Connect the lower filters first */
if(!cf->next->connected) {
result = Curl_conn_cf_connect(cf->next, data, blocking, done);
if(result || !*done)
return result;
}
*done = FALSE;
CF_DATA_SAVE(save, cf, data);
if(!ctx->h2) {
result = cf_h2_ctx_init(cf, data, FALSE);
if(result)
goto out;
}
if(-1 == h2_process_pending_input(cf, data, &result)) {
result = CURLE_HTTP2;
goto out;
}
*done = TRUE;
cf->connected = TRUE;
result = CURLE_OK;
out:
CF_DATA_RESTORE(cf, save);
return result;
}
static void cf_h2_close(struct Curl_cfilter *cf, struct Curl_easy *data)
{
struct cf_h2_ctx *ctx = cf->ctx;
if(ctx) {
struct cf_call_data save;
CF_DATA_SAVE(save, cf, data);
cf_h2_ctx_clear(ctx);
CF_DATA_RESTORE(cf, save);
}
}
static void cf_h2_destroy(struct Curl_cfilter *cf, struct Curl_easy *data)
{
struct cf_h2_ctx *ctx = cf->ctx;
(void)data;
if(ctx) {
cf_h2_ctx_free(ctx);
cf->ctx = NULL;
}
}
static CURLcode http2_data_pause(struct Curl_cfilter *cf,
struct Curl_easy *data,
bool pause)
{
struct cf_h2_ctx *ctx = cf->ctx;
DEBUGASSERT(data);
#ifdef NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE
if(ctx && ctx->h2) {
struct HTTP *stream = data->req.p.http;
uint32_t window = !pause * HTTP2_HUGE_WINDOW_SIZE;
CURLcode result;
int rv = nghttp2_session_set_local_window_size(ctx->h2,
NGHTTP2_FLAG_NONE,
stream->stream_id,
window);
if(rv) {
failf(data, "nghttp2_session_set_local_window_size() failed: %s(%d)",
nghttp2_strerror(rv), rv);
return CURLE_HTTP2;
}
/* make sure the window update gets sent */
result = h2_session_send(cf, data);
if(result)
return result;
DEBUGF(infof(data, "Set HTTP/2 window size to %u for stream %u",
window, stream->stream_id));
#ifdef DEBUGBUILD
{
/* read out the stream local window again */
uint32_t window2 =
nghttp2_session_get_stream_local_window_size(ctx->h2,
stream->stream_id);
DEBUGF(infof(data, "HTTP/2 window size is now %u for stream %u",
window2, stream->stream_id));
}
#endif
}
#endif
return CURLE_OK;
}
static CURLcode cf_h2_cntrl(struct Curl_cfilter *cf,
struct Curl_easy *data,
int event, int arg1, void *arg2)
{
CURLcode result = CURLE_OK;
struct cf_call_data save;
(void)arg2;
CF_DATA_SAVE(save, cf, data);
switch(event) {
case CF_CTRL_DATA_SETUP: {
result = http2_data_setup(cf, data);
break;
}
case CF_CTRL_DATA_PAUSE: {
result = http2_data_pause(cf, data, (arg1 != 0));
break;
}
case CF_CTRL_DATA_DONE_SEND: {
result = http2_data_done_send(cf, data);
break;
}
case CF_CTRL_DATA_DONE: {
http2_data_done(cf, data, arg1 != 0);
break;
}
default:
break;
}
CF_DATA_RESTORE(cf, save);
return result;
}
static bool cf_h2_data_pending(struct Curl_cfilter *cf,
const struct Curl_easy *data)
{
struct cf_h2_ctx *ctx = cf->ctx;
if(ctx && ctx->inbuflen > 0 && ctx->nread_inbuf > ctx->inbuflen)
return TRUE;
return cf->next? cf->next->cft->has_data_pending(cf->next, data) : FALSE;
}
static bool cf_h2_is_alive(struct Curl_cfilter *cf,
struct Curl_easy *data,
bool *input_pending)
{
struct cf_h2_ctx *ctx = cf->ctx;
CURLcode result;
struct cf_call_data save;
CF_DATA_SAVE(save, cf, data);
result = (ctx && ctx->h2 && http2_connisalive(cf, data, input_pending));
DEBUGF(LOG_CF(data, cf, "conn alive -> %d, input_pending=%d",
result, *input_pending));
CF_DATA_RESTORE(cf, save);
return result;
}
static CURLcode cf_h2_keep_alive(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
CURLcode result;
struct cf_call_data save;
CF_DATA_SAVE(save, cf, data);
result = http2_send_ping(cf, data);
CF_DATA_RESTORE(cf, save);
return result;
}
static CURLcode cf_h2_query(struct Curl_cfilter *cf,
struct Curl_easy *data,
int query, int *pres1, void *pres2)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct cf_call_data save;
size_t effective_max;
switch(query) {
case CF_QUERY_MAX_CONCURRENT:
DEBUGASSERT(pres1);
CF_DATA_SAVE(save, cf, data);
if(nghttp2_session_check_request_allowed(ctx->h2) == 0) {
/* the limit is what we have in use right now */
effective_max = CONN_INUSE(cf->conn);
}
else {
effective_max = ctx->max_concurrent_streams;
}
*pres1 = (effective_max > INT_MAX)? INT_MAX : (int)effective_max;
CF_DATA_RESTORE(cf, save);
return CURLE_OK;
default:
break;
}
return cf->next?
cf->next->cft->query(cf->next, data, query, pres1, pres2) :
CURLE_UNKNOWN_OPTION;
}
struct Curl_cftype Curl_cft_nghttp2 = {
"HTTP/2",
CF_TYPE_MULTIPLEX,
CURL_LOG_DEFAULT,
cf_h2_destroy,
cf_h2_connect,
cf_h2_close,
Curl_cf_def_get_host,
cf_h2_get_select_socks,
cf_h2_data_pending,
cf_h2_send,
cf_h2_recv,
cf_h2_cntrl,
cf_h2_is_alive,
cf_h2_keep_alive,
cf_h2_query,
};
static CURLcode http2_cfilter_add(struct Curl_cfilter **pcf,
struct Curl_easy *data,
struct connectdata *conn,
int sockindex)
{
struct Curl_cfilter *cf = NULL;
struct cf_h2_ctx *ctx;
CURLcode result = CURLE_OUT_OF_MEMORY;
DEBUGASSERT(data->conn);
ctx = calloc(sizeof(*ctx), 1);
if(!ctx)
goto out;
result = Curl_cf_create(&cf, &Curl_cft_nghttp2, ctx);
if(result)
goto out;
Curl_conn_cf_add(data, conn, sockindex, cf);
result = CURLE_OK;
out:
if(result)
cf_h2_ctx_free(ctx);
*pcf = result? NULL : cf;
return result;
}
static CURLcode http2_cfilter_insert_after(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct Curl_cfilter *cf_h2 = NULL;
struct cf_h2_ctx *ctx;
CURLcode result = CURLE_OUT_OF_MEMORY;
(void)data;
ctx = calloc(sizeof(*ctx), 1);
if(!ctx)
goto out;
result = Curl_cf_create(&cf_h2, &Curl_cft_nghttp2, ctx);
if(result)
goto out;
Curl_conn_cf_insert_after(cf, cf_h2);
result = CURLE_OK;
out:
if(result)
cf_h2_ctx_free(ctx);
return result;
}
bool Curl_cf_is_http2(struct Curl_cfilter *cf, const struct Curl_easy *data)
{
(void)data;
for(; cf; cf = cf->next) {
if(cf->cft == &Curl_cft_nghttp2)
return TRUE;
if(cf->cft->flags & CF_TYPE_IP_CONNECT)
return FALSE;
}
return FALSE;
}
bool Curl_conn_is_http2(const struct Curl_easy *data,
const struct connectdata *conn,
int sockindex)
{
return conn? Curl_cf_is_http2(conn->cfilter[sockindex], data) : FALSE;
}
bool Curl_http2_may_switch(struct Curl_easy *data,
struct connectdata *conn,
int sockindex)
{
(void)sockindex;
if(!Curl_conn_is_http2(data, conn, sockindex) &&
data->state.httpwant == CURL_HTTP_VERSION_2_PRIOR_KNOWLEDGE) {
#ifndef CURL_DISABLE_PROXY
if(conn->bits.httpproxy && !conn->bits.tunnel_proxy) {
/* We don't support HTTP/2 proxies yet. Also it's debatable
whether or not this setting should apply to HTTP/2 proxies. */
infof(data, "Ignoring HTTP/2 prior knowledge due to proxy");
return FALSE;
}
#endif
return TRUE;
}
return FALSE;
}
CURLcode Curl_http2_switch(struct Curl_easy *data,
struct connectdata *conn, int sockindex)
{
struct Curl_cfilter *cf;
CURLcode result;
DEBUGASSERT(!Curl_conn_is_http2(data, conn, sockindex));
DEBUGF(infof(data, DMSGI(data, sockindex, "switching to HTTP/2")));
result = http2_cfilter_add(&cf, data, conn, sockindex);
if(result)
return result;
result = cf_h2_ctx_init(cf, data, FALSE);
if(result)
return result;
conn->httpversion = 20; /* we know we're on HTTP/2 now */
conn->bits.multiplex = TRUE; /* at least potentially multiplexed */
conn->bundle->multiuse = BUNDLE_MULTIPLEX;
multi_connchanged(data->multi);
if(cf->next) {
bool done;
return Curl_conn_cf_connect(cf, data, FALSE, &done);
}
return CURLE_OK;
}
CURLcode Curl_http2_switch_at(struct Curl_cfilter *cf, struct Curl_easy *data)
{
struct Curl_cfilter *cf_h2;
CURLcode result;
DEBUGASSERT(!Curl_cf_is_http2(cf, data));
result = http2_cfilter_insert_after(cf, data);
if(result)
return result;
cf_h2 = cf->next;
result = cf_h2_ctx_init(cf_h2, data, FALSE);
if(result)
return result;
cf->conn->httpversion = 20; /* we know we're on HTTP/2 now */
cf->conn->bits.multiplex = TRUE; /* at least potentially multiplexed */
cf->conn->bundle->multiuse = BUNDLE_MULTIPLEX;
multi_connchanged(data->multi);
if(cf_h2->next) {
bool done;
return Curl_conn_cf_connect(cf_h2, data, FALSE, &done);
}
return CURLE_OK;
}
CURLcode Curl_http2_upgrade(struct Curl_easy *data,
struct connectdata *conn, int sockindex,
const char *mem, size_t nread)
{
struct Curl_cfilter *cf;
struct cf_h2_ctx *ctx;
CURLcode result;
DEBUGASSERT(!Curl_conn_is_http2(data, conn, sockindex));
DEBUGF(infof(data, DMSGI(data, sockindex, "upgrading to HTTP/2")));
DEBUGASSERT(data->req.upgr101 == UPGR101_RECEIVED);
result = http2_cfilter_add(&cf, data, conn, sockindex);
if(result)
return result;
DEBUGASSERT(cf->cft == &Curl_cft_nghttp2);
ctx = cf->ctx;
result = cf_h2_ctx_init(cf, data, TRUE);
if(result)
return result;
if(nread) {
/* we are going to copy mem to httpc->inbuf. This is required since
mem is part of buffer pointed by stream->mem, and callbacks
called by nghttp2_session_mem_recv() will write stream specific
data into stream->mem, overwriting data already there. */
if(H2_BUFSIZE < nread) {
failf(data, "connection buffer size is too small to store data "
"following HTTP Upgrade response header: buflen=%d, datalen=%zu",
H2_BUFSIZE, nread);
return CURLE_HTTP2;
}
infof(data, "Copying HTTP/2 data in stream buffer to connection buffer"
" after upgrade: len=%zu", nread);
DEBUGASSERT(ctx->nread_inbuf == 0);
memcpy(ctx->inbuf, mem, nread);
ctx->inbuflen = nread;
}
conn->httpversion = 20; /* we know we're on HTTP/2 now */
conn->bits.multiplex = TRUE; /* at least potentially multiplexed */
conn->bundle->multiuse = BUNDLE_MULTIPLEX;
multi_connchanged(data->multi);
if(cf->next) {
bool done;
return Curl_conn_cf_connect(cf, data, FALSE, &done);
}
return CURLE_OK;
}
/* Only call this function for a transfer that already got an HTTP/2
CURLE_HTTP2_STREAM error! */
bool Curl_h2_http_1_1_error(struct Curl_easy *data)
{
struct HTTP *stream = data->req.p.http;
return (stream && stream->error == NGHTTP2_HTTP_1_1_REQUIRED);
}
#else /* !USE_NGHTTP2 */
/* Satisfy external references even if http2 is not compiled in. */
#include <curl/curl.h>
char *curl_pushheader_bynum(struct curl_pushheaders *h, size_t num)
{
(void) h;
(void) num;
return NULL;
}
char *curl_pushheader_byname(struct curl_pushheaders *h, const char *header)
{
(void) h;
(void) header;
return NULL;
}
#endif /* USE_NGHTTP2 */
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