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35380273b9
curl/lib/http2.c
Stefan Eissing 35380273b9
http2: improved on_stream_close/data_done handling 
- there seems to be a code path that cleans up easy handles without
  triggering DONE or DETACH events to the connection filters. This
  would explain wh nghttp2 still holds stream user data
- add GOOD check to easy handle used in on_close_callback to
  prevent crashes, ASSERTs in debug builds.
- NULL the stream user data early before submitting RST
- add checks in on_stream_close() to identify UNGOOD easy handles

Reported-by: Hans-Christian Egtvedt
Fixes #10936
Closes #12562
2023-12-22 10:06:01 +01:00

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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 <stdint.h>
#include <nghttp2/nghttp2.h>
#include "urldata.h"
#include "bufq.h"
#include "http1.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 "urlapi-int.h"
#include "cfilters.h"
#include "connect.h"
#include "rand.h"
#include "strtoofft.h"
#include "strdup.h"
#include "transfer.h"
#include "dynbuf.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"
#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
/* buffer dimensioning:
* use 16K as chunk size, as that fits H2 DATA frames well */
#define H2_CHUNK_SIZE (16 * 1024)
/* this is how much we want "in flight" for a stream */
#define H2_STREAM_WINDOW_SIZE (10 * 1024 * 1024)
/* on receiving from TLS, we prep for holding a full stream window */
#define H2_NW_RECV_CHUNKS (H2_STREAM_WINDOW_SIZE / H2_CHUNK_SIZE)
/* on send into TLS, we just want to accumulate small frames */
#define H2_NW_SEND_CHUNKS 1
/* stream recv/send chunks are a result of window / chunk sizes */
#define H2_STREAM_RECV_CHUNKS (H2_STREAM_WINDOW_SIZE / H2_CHUNK_SIZE)
/* keep smaller stream upload buffer (default h2 window size) to have
* our progress bars and "upload done" reporting closer to reality */
#define H2_STREAM_SEND_CHUNKS ((64 * 1024) / H2_CHUNK_SIZE)
/* spare chunks we keep for a full window */
#define H2_STREAM_POOL_SPARES (H2_STREAM_WINDOW_SIZE / H2_CHUNK_SIZE)
/* We need to accommodate the max number of streams with their window
* sizes on the overall connection. Streams might become PAUSED which
* will block their received QUOTA in the connection window. And if we
* run out of space, the server is blocked from sending us any data.
* See #10988 for an issue with this. */
#define HTTP2_HUGE_WINDOW_SIZE (100 * H2_STREAM_WINDOW_SIZE)
#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 = H2_STREAM_WINDOW_SIZE;
iv[2].settings_id = NGHTTP2_SETTINGS_ENABLE_PUSH;
iv[2].value = data->multi->push_cb != NULL;
return 3;
}
static ssize_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 or a negative number on error. */
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;
struct bufq inbufq; /* network input */
struct bufq outbufq; /* network output */
struct bufc_pool stream_bufcp; /* spares for stream buffers */
size_t drain_total; /* sum of all stream's UrlState drain */
int32_t goaway_error;
int32_t last_stream_id;
BIT(conn_closed);
BIT(goaway);
BIT(enable_push);
BIT(nw_out_blocked);
};
/* How to access `call_data` from a cf_h2 filter */
#undef CF_CTX_CALL_DATA
#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);
}
Curl_bufq_free(&ctx->inbufq);
Curl_bufq_free(&ctx->outbufq);
Curl_bufcp_free(&ctx->stream_bufcp);
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 CURLcode h2_progress_egress(struct Curl_cfilter *cf,
struct Curl_easy *data);
/**
* All about the H3 internals of a stream
*/
struct stream_ctx {
/*********** for HTTP/2 we store stream-local data here *************/
int32_t id; /* HTTP/2 protocol identifier for stream */
struct bufq recvbuf; /* response buffer */
struct bufq sendbuf; /* request buffer */
struct h1_req_parser h1; /* parsing the request */
struct dynhds resp_trailers; /* response trailer fields */
size_t resp_hds_len; /* amount of response header bytes in recvbuf */
size_t upload_blocked_len;
curl_off_t upload_left; /* number of request bytes left to upload */
char **push_headers; /* allocated array */
size_t push_headers_used; /* number of entries filled in */
size_t push_headers_alloc; /* number of entries allocated */
int status_code; /* HTTP response status code */
uint32_t error; /* stream error code */
uint32_t local_window_size; /* the local recv window size */
bool resp_hds_complete; /* we have a complete, final response */
bool closed; /* TRUE on stream close */
bool reset; /* TRUE on stream reset */
bool close_handled; /* TRUE if stream closure is handled by libcurl */
bool bodystarted;
bool send_closed; /* transfer is done sending, we might have still
buffered data in stream->sendbuf to upload. */
};
#define H2_STREAM_CTX(d) ((struct stream_ctx *)(((d) && (d)->req.p.http)? \
((struct HTTP *)(d)->req.p.http)->h2_ctx \
: NULL))
#define H2_STREAM_LCTX(d) ((struct HTTP *)(d)->req.p.http)->h2_ctx
#define H2_STREAM_ID(d) (H2_STREAM_CTX(d)? \
H2_STREAM_CTX(d)->id : -2)
/*
* Mark this transfer to get "drained".
*/
static void drain_stream(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct stream_ctx *stream)
{
unsigned char bits;
(void)cf;
bits = CURL_CSELECT_IN;
if(!stream->send_closed &&
(stream->upload_left || stream->upload_blocked_len))
bits |= CURL_CSELECT_OUT;
if(data->state.select_bits != bits) {
CURL_TRC_CF(data, cf, "[%d] DRAIN select_bits=%x",
stream->id, bits);
data->state.select_bits = bits;
Curl_expire(data, 0, EXPIRE_RUN_NOW);
}
}
static CURLcode http2_data_setup(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct stream_ctx **pstream)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct stream_ctx *stream;
(void)cf;
DEBUGASSERT(data);
if(!data->req.p.http) {
failf(data, "initialization failure, transfer not http initialized");
return CURLE_FAILED_INIT;
}
stream = H2_STREAM_CTX(data);
if(stream) {
*pstream = stream;
return CURLE_OK;
}
stream = calloc(1, sizeof(*stream));
if(!stream)
return CURLE_OUT_OF_MEMORY;
stream->id = -1;
Curl_bufq_initp(&stream->sendbuf, &ctx->stream_bufcp,
H2_STREAM_SEND_CHUNKS, BUFQ_OPT_NONE);
Curl_bufq_initp(&stream->recvbuf, &ctx->stream_bufcp,
H2_STREAM_RECV_CHUNKS, BUFQ_OPT_SOFT_LIMIT);
Curl_h1_req_parse_init(&stream->h1, H1_PARSE_DEFAULT_MAX_LINE_LEN);
Curl_dynhds_init(&stream->resp_trailers, 0, DYN_HTTP_REQUEST);
stream->resp_hds_len = 0;
stream->bodystarted = FALSE;
stream->status_code = -1;
stream->closed = FALSE;
stream->close_handled = FALSE;
stream->error = NGHTTP2_NO_ERROR;
stream->local_window_size = H2_STREAM_WINDOW_SIZE;
stream->upload_left = 0;
H2_STREAM_LCTX(data) = stream;
*pstream = stream;
return CURLE_OK;
}
static void http2_data_done(struct Curl_cfilter *cf,
struct Curl_easy *data, bool premature)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct stream_ctx *stream = H2_STREAM_CTX(data);
DEBUGASSERT(ctx);
(void)premature;
if(!stream)
return;
if(ctx->h2) {
bool flush_egress = FALSE;
/* returns error if stream not known, which is fine here */
(void)nghttp2_session_set_stream_user_data(ctx->h2, stream->id, NULL);
if(!stream->closed && stream->id > 0) {
/* RST_STREAM */
CURL_TRC_CF(data, cf, "[%d] premature DATA_DONE, RST stream",
stream->id);
stream->closed = TRUE;
stream->reset = TRUE;
stream->send_closed = TRUE;
nghttp2_submit_rst_stream(ctx->h2, NGHTTP2_FLAG_NONE,
stream->id, NGHTTP2_STREAM_CLOSED);
flush_egress = TRUE;
}
if(!Curl_bufq_is_empty(&stream->recvbuf)) {
/* Anything in the recvbuf is still being counted
* in stream and connection window flow control. Need
* to free that space or the connection window might get
* exhausted eventually. */
nghttp2_session_consume(ctx->h2, stream->id,
Curl_bufq_len(&stream->recvbuf));
/* give WINDOW_UPATE a chance to be sent, but ignore any error */
flush_egress = TRUE;
}
if(flush_egress)
nghttp2_session_send(ctx->h2);
}
Curl_bufq_free(&stream->sendbuf);
Curl_bufq_free(&stream->recvbuf);
Curl_h1_req_parse_free(&stream->h1);
Curl_dynhds_free(&stream->resp_trailers);
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;
}
free(stream);
H2_STREAM_LCTX(data) = NULL;
}
static int h2_client_new(struct Curl_cfilter *cf,
nghttp2_session_callbacks *cbs)
{
struct cf_h2_ctx *ctx = cf->ctx;
nghttp2_option *o;
int rc = nghttp2_option_new(&o);
if(rc)
return rc;
/* We handle window updates ourself to enforce buffer limits */
nghttp2_option_set_no_auto_window_update(o, 1);
#if NGHTTP2_VERSION_NUM >= 0x013200
/* with 1.50.0 */
/* 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);
#endif
rc = nghttp2_session_client_new2(&ctx->h2, cbs, cf, o);
nghttp2_option_del(o);
return rc;
}
static ssize_t nw_in_reader(void *reader_ctx,
unsigned char *buf, size_t buflen,
CURLcode *err)
{
struct Curl_cfilter *cf = reader_ctx;
struct Curl_easy *data = CF_DATA_CURRENT(cf);
return Curl_conn_cf_recv(cf->next, data, (char *)buf, buflen, err);
}
static ssize_t nw_out_writer(void *writer_ctx,
const unsigned char *buf, size_t buflen,
CURLcode *err)
{
struct Curl_cfilter *cf = writer_ctx;
struct Curl_easy *data = CF_DATA_CURRENT(cf);
if(data) {
ssize_t nwritten = Curl_conn_cf_send(cf->next, data,
(const char *)buf, buflen, err);
if(nwritten > 0)
CURL_TRC_CF(data, cf, "[0] egress: wrote %zd bytes", nwritten);
return nwritten;
}
return 0;
}
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);
#ifndef CURL_DISABLE_VERBOSE_STRINGS
static int on_frame_send(nghttp2_session *session, const nghttp2_frame *frame,
void *userp);
#endif
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);
/*
* 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 stream_ctx *stream;
CURLcode result = CURLE_OUT_OF_MEMORY;
int rc;
nghttp2_session_callbacks *cbs = NULL;
DEBUGASSERT(!ctx->h2);
Curl_bufcp_init(&ctx->stream_bufcp, H2_CHUNK_SIZE, H2_STREAM_POOL_SPARES);
Curl_bufq_initp(&ctx->inbufq, &ctx->stream_bufcp, H2_NW_RECV_CHUNKS, 0);
Curl_bufq_initp(&ctx->outbufq, &ctx->stream_bufcp, H2_NW_SEND_CHUNKS, 0);
ctx->last_stream_id = 2147483647;
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);
#ifndef CURL_DISABLE_VERBOSE_STRINGS
nghttp2_session_callbacks_set_on_frame_send_callback(cbs, on_frame_send);
#endif
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;
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];
ssize_t binlen; /* length of the binsettings data */
binlen = populate_binsettings(binsettings, data);
if(binlen <= 0) {
failf(data, "nghttp2 unexpectedly failed on pack_settings_payload");
result = CURLE_FAILED_INIT;
goto out;
}
result = http2_data_setup(cf, data, &stream);
if(result)
goto out;
DEBUGASSERT(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->id,
data);
if(rc) {
infof(data, "http/2: failed to set user_data for stream %u",
stream->id);
DEBUGASSERT(0);
}
CURL_TRC_CF(data, cf, "created session via Upgrade");
}
else {
nghttp2_settings_entry iv[H2_SETTINGS_IV_LEN];
int ivlen;
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;
CURL_TRC_CF(data, cf, "[0] created h2 session%s",
via_h1_upgrade? " (via h1 upgrade)" : "");
out:
if(cbs)
nghttp2_session_callbacks_del(cbs);
return result;
}
/*
* 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);
}
/*
* Processes pending input left in network input buffer.
* 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;
const unsigned char *buf;
size_t blen;
ssize_t rv;
while(Curl_bufq_peek(&ctx->inbufq, &buf, &blen)) {
rv = nghttp2_session_mem_recv(ctx->h2, (const uint8_t *)buf, blen);
if(rv < 0) {
failf(data,
"process_pending_input: nghttp2_session_mem_recv() returned "
"%zd:%s", rv, nghttp2_strerror((int)rv));
*err = CURLE_RECV_ERROR;
return -1;
}
Curl_bufq_skip(&ctx->inbufq, (size_t)rv);
if(Curl_bufq_is_empty(&ctx->inbufq)) {
break;
}
else {
CURL_TRC_CF(data, cf, "process_pending_input: %zu bytes left "
"in connection buffer", Curl_bufq_len(&ctx->inbufq));
}
}
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");
}
return 0;
}
/*
* 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;
nread = Curl_bufq_slurp(&ctx->inbufq, nw_in_reader, cf, &result);
if(nread != -1) {
CURL_TRC_CF(data, cf, "%zd bytes stray data read before trying "
"h2 connection", nread);
if(h2_process_pending_input(cf, data, &result) < 0)
/* immediate error, considered dead */
alive = FALSE;
else {
alive = !should_close_session(ctx);
}
}
else if(result != CURLE_AGAIN) {
/* the read failed so let's say this is dead anyway */
alive = FALSE;
}
}
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 nw_out_flush(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_h2_ctx *ctx = cf->ctx;
ssize_t nwritten;
CURLcode result;
(void)data;
if(Curl_bufq_is_empty(&ctx->outbufq))
return CURLE_OK;
nwritten = Curl_bufq_pass(&ctx->outbufq, nw_out_writer, cf, &result);
if(nwritten < 0) {
if(result == CURLE_AGAIN) {
CURL_TRC_CF(data, cf, "flush nw send buffer(%zu) -> EAGAIN",
Curl_bufq_len(&ctx->outbufq));
ctx->nw_out_blocked = 1;
}
return result;
}
return Curl_bufq_is_empty(&ctx->outbufq)? CURLE_OK: CURLE_AGAIN;
}
/*
* 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 nwritten;
CURLcode result = CURLE_OK;
(void)h2;
(void)flags;
DEBUGASSERT(data);
nwritten = Curl_bufq_write_pass(&ctx->outbufq, buf, blen,
nw_out_writer, cf, &result);
if(nwritten < 0) {
if(result == CURLE_AGAIN) {
ctx->nw_out_blocked = 1;
return NGHTTP2_ERR_WOULDBLOCK;
}
failf(data, "Failed sending HTTP2 data");
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
if(!nwritten) {
ctx->nw_out_blocked = 1;
return NGHTTP2_ERR_WOULDBLOCK;
}
return nwritten;
}
/* 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 stream_ctx *stream = H2_STREAM_CTX(h->data);
if(stream && 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)
{
struct stream_ctx *stream;
size_t len;
size_t i;
/* 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;
stream = H2_STREAM_CTX(h->data);
if(!stream)
return NULL;
len = strlen(header);
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;
}
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 {
struct stream_ctx *second_stream;
second->req.p.http = http;
http2_data_setup(cf, second, &second_stream);
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, HTTP_PSEUDO_SCHEME);
if(v) {
uc = curl_url_set(u, CURLUPART_SCHEME, v, 0);
if(uc) {
rc = 1;
goto fail;
}
}
v = curl_pushheader_byname(hp, HTTP_PSEUDO_AUTHORITY);
if(v) {
uc = Curl_url_set_authority(u, v, CURLU_DISALLOW_USER);
if(uc) {
rc = 2;
goto fail;
}
}
v = curl_pushheader_byname(hp, HTTP_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 void discard_newhandle(struct Curl_cfilter *cf,
struct Curl_easy *newhandle)
{
if(!newhandle->req.p.http) {
http2_data_done(cf, newhandle, TRUE);
newhandle->req.p.http = NULL;
}
(void)Curl_close(&newhandle);
}
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 */
CURL_TRC_CF(data, cf, "[%d] PUSH_PROMISE received",
frame->promised_stream_id);
if(data->multi->push_cb) {
struct stream_ctx *stream;
struct stream_ctx *newstream;
struct curl_pushheaders heads;
CURLMcode rc;
CURLcode result;
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 */
CURL_TRC_CF(data, cf, "Got PUSH_PROMISE, ask application");
stream = H2_STREAM_CTX(data);
if(!stream) {
failf(data, "Internal NULL stream");
discard_newhandle(cf, newhandle);
rv = CURL_PUSH_DENY;
goto fail;
}
rv = set_transfer_url(newhandle, &heads);
if(rv) {
discard_newhandle(cf, newhandle);
rv = CURL_PUSH_DENY;
goto fail;
}
result = http2_data_setup(cf, newhandle, &newstream);
if(result) {
failf(data, "error setting up stream: %d", result);
discard_newhandle(cf, newhandle);
rv = CURL_PUSH_DENY;
goto fail;
}
DEBUGASSERT(stream);
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 */
discard_newhandle(cf, newhandle);
goto fail;
}
newstream->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");
discard_newhandle(cf, newhandle);
rv = CURL_PUSH_DENY;
goto fail;
}
rv = nghttp2_session_set_stream_user_data(ctx->h2,
newstream->id,
newhandle);
if(rv) {
infof(data, "failed to set user_data for stream %u",
newstream->id);
DEBUGASSERT(0);
rv = CURL_PUSH_DENY;
goto fail;
}
}
else {
CURL_TRC_CF(data, cf, "Got PUSH_PROMISE, ignore it");
rv = CURL_PUSH_DENY;
}
fail:
return rv;
}
static CURLcode recvbuf_write_hds(struct Curl_cfilter *cf,
struct Curl_easy *data,
const char *buf, size_t blen)
{
struct stream_ctx *stream = H2_STREAM_CTX(data);
ssize_t nwritten;
CURLcode result;
(void)cf;
nwritten = Curl_bufq_write(&stream->recvbuf,
(const unsigned char *)buf, blen, &result);
if(nwritten < 0)
return result;
stream->resp_hds_len += (size_t)nwritten;
DEBUGASSERT((size_t)nwritten == blen);
return CURLE_OK;
}
static CURLcode on_stream_frame(struct Curl_cfilter *cf,
struct Curl_easy *data,
const nghttp2_frame *frame)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct stream_ctx *stream = H2_STREAM_CTX(data);
int32_t stream_id = frame->hd.stream_id;
CURLcode result;
size_t rbuflen;
int rv;
if(!stream) {
CURL_TRC_CF(data, cf, "[%d] No stream_ctx set", stream_id);
return CURLE_FAILED_INIT;
}
switch(frame->hd.type) {
case NGHTTP2_DATA:
rbuflen = Curl_bufq_len(&stream->recvbuf);
CURL_TRC_CF(data, cf, "[%d] DATA, buffered=%zu, window=%d/%d",
stream_id, rbuflen,
nghttp2_session_get_stream_effective_recv_data_length(
ctx->h2, stream->id),
nghttp2_session_get_stream_effective_local_window_size(
ctx->h2, stream->id));
/* If !body started on this stream, then receiving DATA is illegal. */
if(!stream->bodystarted) {
rv = nghttp2_submit_rst_stream(ctx->h2, NGHTTP2_FLAG_NONE,
stream_id, NGHTTP2_PROTOCOL_ERROR);
if(nghttp2_is_fatal(rv)) {
return CURLE_RECV_ERROR;
}
}
if(frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
drain_stream(cf, data, stream);
}
else if(rbuflen > stream->local_window_size) {
int32_t wsize = nghttp2_session_get_stream_local_window_size(
ctx->h2, stream->id);
if(wsize > 0 && (uint32_t)wsize != stream->local_window_size) {
/* H2 flow control is not absolute, as the server might not have the
* same view, yet. When we receive more than we want, we enforce
* the local window size again to make nghttp2 send WINDOW_UPATEs
* accordingly. */
nghttp2_session_set_local_window_size(ctx->h2,
NGHTTP2_FLAG_NONE,
stream->id,
stream->local_window_size);
}
}
break;
case NGHTTP2_HEADERS:
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 CURLE_RECV_ERROR;
/* Only final status code signals the end of header */
if(stream->status_code / 100 != 1) {
stream->bodystarted = TRUE;
stream->status_code = -1;
}
result = recvbuf_write_hds(cf, data, STRCONST("\r\n"));
if(result)
return result;
if(stream->status_code / 100 != 1) {
stream->resp_hds_complete = TRUE;
}
drain_stream(cf, data, stream);
break;
case NGHTTP2_PUSH_PROMISE:
rv = push_promise(cf, data, &frame->push_promise);
if(rv) { /* deny! */
DEBUGASSERT((rv > CURL_PUSH_OK) && (rv <= CURL_PUSH_ERROROUT));
rv = nghttp2_submit_rst_stream(ctx->h2, NGHTTP2_FLAG_NONE,
frame->push_promise.promised_stream_id,
NGHTTP2_CANCEL);
if(nghttp2_is_fatal(rv))
return CURLE_SEND_ERROR;
else if(rv == CURL_PUSH_ERROROUT) {
CURL_TRC_CF(data, cf, "[%d] fail in PUSH_PROMISE received",
stream_id);
return CURLE_RECV_ERROR;
}
}
break;
case NGHTTP2_RST_STREAM:
stream->closed = TRUE;
if(frame->rst_stream.error_code) {
stream->reset = TRUE;
}
stream->send_closed = TRUE;
drain_stream(cf, data, stream);
break;
case NGHTTP2_WINDOW_UPDATE:
if(CURL_WANT_SEND(data)) {
drain_stream(cf, data, stream);
}
break;
default:
break;
}
return CURLE_OK;
}
#ifndef CURL_DISABLE_VERBOSE_STRINGS
static int fr_print(const nghttp2_frame *frame, char *buffer, size_t blen)
{
switch(frame->hd.type) {
case NGHTTP2_DATA: {
return msnprintf(buffer, blen,
"FRAME[DATA, len=%d, eos=%d, padlen=%d]",
(int)frame->hd.length,
!!(frame->hd.flags & NGHTTP2_FLAG_END_STREAM),
(int)frame->data.padlen);
}
case NGHTTP2_HEADERS: {
return msnprintf(buffer, blen,
"FRAME[HEADERS, len=%d, hend=%d, eos=%d]",
(int)frame->hd.length,
!!(frame->hd.flags & NGHTTP2_FLAG_END_HEADERS),
!!(frame->hd.flags & NGHTTP2_FLAG_END_STREAM));
}
case NGHTTP2_PRIORITY: {
return msnprintf(buffer, blen,
"FRAME[PRIORITY, len=%d, flags=%d]",
(int)frame->hd.length, frame->hd.flags);
}
case NGHTTP2_RST_STREAM: {
return msnprintf(buffer, blen,
"FRAME[RST_STREAM, len=%d, flags=%d, error=%u]",
(int)frame->hd.length, frame->hd.flags,
frame->rst_stream.error_code);
}
case NGHTTP2_SETTINGS: {
if(frame->hd.flags & NGHTTP2_FLAG_ACK) {
return msnprintf(buffer, blen, "FRAME[SETTINGS, ack=1]");
}
return msnprintf(buffer, blen,
"FRAME[SETTINGS, len=%d]", (int)frame->hd.length);
}
case NGHTTP2_PUSH_PROMISE: {
return msnprintf(buffer, blen,
"FRAME[PUSH_PROMISE, len=%d, hend=%d]",
(int)frame->hd.length,
!!(frame->hd.flags & NGHTTP2_FLAG_END_HEADERS));
}
case NGHTTP2_PING: {
return msnprintf(buffer, blen,
"FRAME[PING, len=%d, ack=%d]",
(int)frame->hd.length,
frame->hd.flags&NGHTTP2_FLAG_ACK);
}
case NGHTTP2_GOAWAY: {
char scratch[128];
size_t s_len = sizeof(scratch)/sizeof(scratch[0]);
size_t len = (frame->goaway.opaque_data_len < s_len)?
frame->goaway.opaque_data_len : s_len-1;
if(len)
memcpy(scratch, frame->goaway.opaque_data, len);
scratch[len] = '\0';
return msnprintf(buffer, blen, "FRAME[GOAWAY, error=%d, reason='%s', "
"last_stream=%d]", frame->goaway.error_code,
scratch, frame->goaway.last_stream_id);
}
case NGHTTP2_WINDOW_UPDATE: {
return msnprintf(buffer, blen,
"FRAME[WINDOW_UPDATE, incr=%d]",
frame->window_update.window_size_increment);
}
default:
return msnprintf(buffer, blen, "FRAME[%d, len=%d, flags=%d]",
frame->hd.type, (int)frame->hd.length,
frame->hd.flags);
}
}
static int on_frame_send(nghttp2_session *session, const nghttp2_frame *frame,
void *userp)
{
struct Curl_cfilter *cf = userp;
struct Curl_easy *data = CF_DATA_CURRENT(cf);
(void)session;
DEBUGASSERT(data);
if(data && Curl_trc_cf_is_verbose(cf, data)) {
char buffer[256];
int len;
len = fr_print(frame, buffer, sizeof(buffer)-1);
buffer[len] = 0;
CURL_TRC_CF(data, cf, "[%d] -> %s", frame->hd.stream_id, buffer);
}
return 0;
}
#endif /* !CURL_DISABLE_VERBOSE_STRINGS */
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 = CF_DATA_CURRENT(cf), *data_s;
int32_t stream_id = frame->hd.stream_id;
DEBUGASSERT(data);
#ifndef CURL_DISABLE_VERBOSE_STRINGS
if(Curl_trc_cf_is_verbose(cf, data)) {
char buffer[256];
int len;
len = fr_print(frame, buffer, sizeof(buffer)-1);
buffer[len] = 0;
CURL_TRC_CF(data, cf, "[%d] <- %s",frame->hd.stream_id, buffer);
}
#endif /* !CURL_DISABLE_VERBOSE_STRINGS */
if(!stream_id) {
/* stream ID zero is for connection-oriented stuff */
DEBUGASSERT(data);
switch(frame->hd.type) {
case NGHTTP2_SETTINGS: {
if(!(frame->hd.flags & NGHTTP2_FLAG_ACK)) {
uint32_t max_conn = ctx->max_concurrent_streams;
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;
CURL_TRC_CF(data, cf, "[0] MAX_CONCURRENT_STREAMS: %d",
ctx->max_concurrent_streams);
CURL_TRC_CF(data, cf, "[0] ENABLE_PUSH: %s",
ctx->enable_push ? "TRUE" : "false");
if(data && max_conn != ctx->max_concurrent_streams) {
/* only signal change if the value actually changed */
CURL_TRC_CF(data, cf, "[0] notify MAX_CONCURRENT_STREAMS: %u",
ctx->max_concurrent_streams);
Curl_multi_connchanged(data->multi);
}
/* Since the initial stream window is 64K, a request might be on HOLD,
* due to exhaustion. The (initial) SETTINGS may announce a much larger
* window and *assume* that we treat this like a WINDOW_UPDATE. Some
* servers send an explicit WINDOW_UPDATE, but not all seem to do that.
* To be safe, we UNHOLD a stream in order not to stall. */
if(CURL_WANT_SEND(data)) {
struct stream_ctx *stream = H2_STREAM_CTX(data);
if(stream)
drain_stream(cf, data, stream);
}
}
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, "received GOAWAY, error=%d, last_stream=%u",
ctx->goaway_error, ctx->last_stream_id);
Curl_multi_connchanged(data->multi);
}
break;
default:
break;
}
return 0;
}
data_s = nghttp2_session_get_stream_user_data(session, stream_id);
if(!data_s) {
CURL_TRC_CF(data, cf, "[%d] No Curl_easy associated", stream_id);
return 0;
}
return on_stream_frame(cf, data_s, frame)? NGHTTP2_ERR_CALLBACK_FAILURE : 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 stream_ctx *stream;
struct Curl_easy *data_s;
ssize_t nwritten;
CURLcode result;
(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. */
CURL_TRC_CF(CF_DATA_CURRENT(cf), cf, "[%d] Data for unknown",
stream_id);
/* consumed explicitly as no one will read it */
nghttp2_session_consume(session, stream_id, len);
return 0;
}
stream = H2_STREAM_CTX(data_s);
if(!stream)
return NGHTTP2_ERR_CALLBACK_FAILURE;
nwritten = Curl_bufq_write(&stream->recvbuf, mem, len, &result);
if(nwritten < 0) {
if(result != CURLE_AGAIN)
return NGHTTP2_ERR_CALLBACK_FAILURE;
nwritten = 0;
}
/* if we receive data for another handle, wake that up */
drain_stream(cf, data_s, stream);
DEBUGASSERT((size_t)nwritten == len);
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 Curl_easy *data_s, *call_data = CF_DATA_CURRENT(cf);
struct stream_ctx *stream;
int rv;
(void)session;
DEBUGASSERT(call_data);
/* 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) {
CURL_TRC_CF(call_data, cf,
"[%d] on_stream_close, no easy set on stream", stream_id);
return 0;
}
if(!GOOD_EASY_HANDLE(data_s)) {
/* nghttp2 still has an easy registered for the stream which has
* been freed be libcurl. This points to a code path that does not
* trigger DONE or DETACH events as it must. */
CURL_TRC_CF(call_data, cf,
"[%d] on_stream_close, not a GOOD easy on stream", stream_id);
(void)nghttp2_session_set_stream_user_data(session, stream_id, 0);
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
stream = H2_STREAM_CTX(data_s);
if(!stream) {
CURL_TRC_CF(data_s, cf,
"[%d] on_stream_close, GOOD easy but no stream", stream_id);
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
stream->closed = TRUE;
stream->error = error_code;
if(stream->error) {
stream->reset = TRUE;
stream->send_closed = TRUE;
}
if(stream->error)
CURL_TRC_CF(data_s, cf, "[%d] RESET: %s (err %d)",
stream_id, nghttp2_http2_strerror(error_code), error_code);
else
CURL_TRC_CF(data_s, cf, "[%d] CLOSED", stream_id);
drain_stream(cf, data_s, stream);
/* 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);
}
return 0;
}
static int on_begin_headers(nghttp2_session *session,
const nghttp2_frame *frame, void *userp)
{
struct Curl_cfilter *cf = userp;
struct stream_ctx *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;
}
if(frame->hd.type != NGHTTP2_HEADERS) {
return 0;
}
stream = H2_STREAM_CTX(data_s);
if(!stream || !stream->bodystarted) {
return 0;
}
return 0;
}
/* 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 stream_ctx *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 = H2_STREAM_CTX(data_s);
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(HTTP_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 */
CURL_TRC_CF(data_s, cf, "[%d] trailer: %.*s: %.*s",
stream->id, (int)namelen, name, (int)valuelen, value);
result = Curl_dynhds_add(&stream->resp_trailers,
(const char *)name, namelen,
(const char *)value, valuelen);
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
return 0;
}
if(namelen == sizeof(HTTP_PSEUDO_STATUS) - 1 &&
memcmp(HTTP_PSEUDO_STATUS, name, namelen) == 0) {
/* nghttp2 guarantees :status is received first and only once. */
char buffer[32];
result = Curl_http_decode_status(&stream->status_code,
(const char *)value, valuelen);
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
msnprintf(buffer, sizeof(buffer), HTTP_PSEUDO_STATUS ":%u\r",
stream->status_code);
result = Curl_headers_push(data_s, buffer, CURLH_PSEUDO);
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
result = recvbuf_write_hds(cf, data_s, STRCONST("HTTP/2 "));
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
result = recvbuf_write_hds(cf, data_s, (const char *)value, valuelen);
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
/* the space character after the status code is mandatory */
result = recvbuf_write_hds(cf, data_s, 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);
CURL_TRC_CF(data_s, cf, "[%d] status: HTTP/2 %03d",
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 = recvbuf_write_hds(cf, data_s, (const char *)name, namelen);
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
result = recvbuf_write_hds(cf, data_s, STRCONST(": "));
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
result = recvbuf_write_hds(cf, data_s, (const char *)value, valuelen);
if(result)
return NGHTTP2_ERR_CALLBACK_FAILURE;
result = recvbuf_write_hds(cf, data_s, 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);
CURL_TRC_CF(data_s, cf, "[%d] header: %.*s: %.*s",
stream->id, (int)namelen, name, (int)valuelen, value);
return 0; /* 0 is successful */
}
static ssize_t req_body_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 stream_ctx *stream = NULL;
CURLcode result;
ssize_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 = H2_STREAM_CTX(data_s);
if(!stream)
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
else
return NGHTTP2_ERR_INVALID_ARGUMENT;
nread = Curl_bufq_read(&stream->sendbuf, buf, length, &result);
if(nread < 0) {
if(result != CURLE_AGAIN)
return NGHTTP2_ERR_CALLBACK_FAILURE;
nread = 0;
}
if(nread > 0 && stream->upload_left != -1)
stream->upload_left -= nread;
CURL_TRC_CF(data_s, cf, "[%d] req_body_read(len=%zu) left=%"
CURL_FORMAT_CURL_OFF_T " -> %zd, %d",
stream_id, length, stream->upload_left, nread, result);
if(stream->upload_left == 0)
*data_flags = NGHTTP2_DATA_FLAG_EOF;
else if(nread == 0)
return NGHTTP2_ERR_DEFERRED;
return nread;
}
#if !defined(CURL_DISABLE_VERBOSE_STRINGS)
static int error_callback(nghttp2_session *session,
const char *msg,
size_t len,
void *userp)
{
struct Curl_cfilter *cf = userp;
struct Curl_easy *data = CF_DATA_CURRENT(cf);
(void)session;
failf(data, "%.*s", (int)len, msg);
return 0;
}
#endif
/*
* 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];
ssize_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;
}
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 stream_ctx *stream = H2_STREAM_CTX(data);
if(!ctx || !ctx->h2 || !stream)
goto out;
CURL_TRC_CF(data, cf, "[%d] data done send", stream->id);
if(!stream->send_closed) {
stream->send_closed = TRUE;
if(stream->upload_left) {
/* we now know that everything that is buffered is all there is. */
stream->upload_left = Curl_bufq_len(&stream->sendbuf);
/* 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->id);
drain_stream(cf, data, stream);
}
}
out:
return result;
}
static ssize_t http2_handle_stream_close(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct stream_ctx *stream,
CURLcode *err)
{
ssize_t rv = 0;
if(stream->error == NGHTTP2_REFUSED_STREAM) {
CURL_TRC_CF(data, cf, "[%d] REFUSED_STREAM, try again on a new "
"connection", 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->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->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->id);
*err = CURLE_HTTP2_STREAM;
return -1;
}
if(Curl_dynhds_count(&stream->resp_trailers)) {
struct dynhds_entry *e;
struct dynbuf dbuf;
size_t i;
*err = CURLE_OK;
Curl_dyn_init(&dbuf, DYN_TRAILERS);
for(i = 0; i < Curl_dynhds_count(&stream->resp_trailers); ++i) {
e = Curl_dynhds_getn(&stream->resp_trailers, i);
if(!e)
break;
Curl_dyn_reset(&dbuf);
*err = Curl_dyn_addf(&dbuf, "%.*s: %.*s\x0d\x0a",
(int)e->namelen, e->name,
(int)e->valuelen, e->value);
if(*err)
break;
Curl_debug(data, CURLINFO_HEADER_IN, Curl_dyn_ptr(&dbuf),
Curl_dyn_len(&dbuf));
*err = Curl_client_write(data, CLIENTWRITE_HEADER|CLIENTWRITE_TRAILER,
Curl_dyn_ptr(&dbuf), Curl_dyn_len(&dbuf));
if(*err)
break;
}
Curl_dyn_free(&dbuf);
if(*err)
goto out;
}
stream->close_handled = TRUE;
*err = CURLE_OK;
rv = 0;
out:
CURL_TRC_CF(data, cf, "handle_stream_close -> %zd, %d", rv, *err);
return rv;
}
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 stream_ctx *depstream = H2_STREAM_CTX(prio->parent);
int32_t depstream_id = depstream? depstream->id:0;
nghttp2_priority_spec_init(pri_spec, depstream_id,
sweight_wanted(data),
data->set.priority.exclusive);
data->state.priority = *prio;
}
/*
* Check if there's been an update in the priority /
* dependency settings and if so it submits a PRIORITY frame with the updated
* info.
* Flush any out data pending in the network buffer.
*/
static CURLcode h2_progress_egress(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct stream_ctx *stream = H2_STREAM_CTX(data);
int rv = 0;
if(stream && stream->id > 0 &&
((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);
CURL_TRC_CF(data, cf, "[%d] Queuing PRIORITY", stream->id);
DEBUGASSERT(stream->id != -1);
rv = nghttp2_submit_priority(ctx->h2, NGHTTP2_FLAG_NONE,
stream->id, &pri_spec);
if(rv)
goto out;
}
ctx->nw_out_blocked = 0;
while(!rv && !ctx->nw_out_blocked && nghttp2_session_want_write(ctx->h2))
rv = nghttp2_session_send(ctx->h2);
out:
if(nghttp2_is_fatal(rv)) {
CURL_TRC_CF(data, cf, "nghttp2_session_send error (%s)%d",
nghttp2_strerror(rv), rv);
return CURLE_SEND_ERROR;
}
return nw_out_flush(cf, data);
}
static ssize_t stream_recv(struct Curl_cfilter *cf, struct Curl_easy *data,
struct stream_ctx *stream,
char *buf, size_t len, CURLcode *err)
{
struct cf_h2_ctx *ctx = cf->ctx;
ssize_t nread = -1;
*err = CURLE_AGAIN;
if(!Curl_bufq_is_empty(&stream->recvbuf)) {
nread = Curl_bufq_read(&stream->recvbuf,
(unsigned char *)buf, len, err);
if(nread < 0)
goto out;
DEBUGASSERT(nread > 0);
}
if(nread < 0) {
if(stream->closed) {
CURL_TRC_CF(data, cf, "[%d] returning CLOSE", stream->id);
nread = http2_handle_stream_close(cf, data, stream, err);
}
else if(stream->reset ||
(ctx->conn_closed && Curl_bufq_is_empty(&ctx->inbufq)) ||
(ctx->goaway && ctx->last_stream_id < stream->id)) {
CURL_TRC_CF(data, cf, "[%d] returning ERR", stream->id);
*err = stream->bodystarted? CURLE_PARTIAL_FILE : CURLE_RECV_ERROR;
nread = -1;
}
}
else if(nread == 0) {
*err = CURLE_AGAIN;
nread = -1;
}
out:
if(nread < 0 && *err != CURLE_AGAIN)
CURL_TRC_CF(data, cf, "[%d] stream_recv(len=%zu) -> %zd, %d",
stream->id, len, nread, *err);
return nread;
}
static CURLcode h2_progress_ingress(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct stream_ctx *stream;
CURLcode result = CURLE_OK;
ssize_t nread;
/* Process network input buffer fist */
if(!Curl_bufq_is_empty(&ctx->inbufq)) {
CURL_TRC_CF(data, cf, "Process %zu bytes in connection buffer",
Curl_bufq_len(&ctx->inbufq));
if(h2_process_pending_input(cf, data, &result) < 0)
return result;
}
/* Receive data from the "lower" filters, e.g. network until
* it is time to stop due to connection close or us not processing
* all network input */
while(!ctx->conn_closed && Curl_bufq_is_empty(&ctx->inbufq)) {
stream = H2_STREAM_CTX(data);
if(stream && (stream->closed || Curl_bufq_is_full(&stream->recvbuf))) {
/* We would like to abort here and stop processing, so that
* the transfer loop can handle the data/close here. However,
* this may leave data in underlying buffers that will not
* be consumed. */
if(!cf->next || !cf->next->cft->has_data_pending(cf->next, data))
break;
}
nread = Curl_bufq_slurp(&ctx->inbufq, nw_in_reader, cf, &result);
if(nread < 0) {
if(result != CURLE_AGAIN) {
failf(data, "Failed receiving HTTP2 data: %d(%s)", result,
curl_easy_strerror(result));
return result;
}
break;
}
else if(nread == 0) {
CURL_TRC_CF(data, cf, "[0] ingress: connection closed");
ctx->conn_closed = TRUE;
break;
}
else {
CURL_TRC_CF(data, cf, "[0] ingress: read %zd bytes",
nread);
}
if(h2_process_pending_input(cf, data, &result))
return result;
}
if(ctx->conn_closed && Curl_bufq_is_empty(&ctx->inbufq)) {
connclose(cf->conn, "GOAWAY received");
}
return CURLE_OK;
}
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 stream_ctx *stream = H2_STREAM_CTX(data);
ssize_t nread = -1;
CURLcode result;
struct cf_call_data save;
if(!stream) {
/* Abnormal call sequence: either this transfer has never opened a stream
* (unlikely) or the transfer has been done, cleaned up its resources, but
* a read() is called anyway. It is not clear what the calling sequence
* is for such a case. */
failf(data, "[%zd-%zd], http/2 recv on a transfer never opened "
"or already cleared", (ssize_t)data->id,
(ssize_t)cf->conn->connection_id);
*err = CURLE_HTTP2;
return -1;
}
CF_DATA_SAVE(save, cf, data);
nread = stream_recv(cf, data, stream, buf, len, err);
if(nread < 0 && *err != CURLE_AGAIN)
goto out;
if(nread < 0) {
*err = h2_progress_ingress(cf, data);
if(*err)
goto out;
nread = stream_recv(cf, data, stream, buf, len, err);
}
if(nread > 0) {
size_t data_consumed = (size_t)nread;
/* Now that we transferred this to the upper layer, we report
* the actual amount of DATA consumed to the H2 session, so
* that it adjusts stream flow control */
if(stream->resp_hds_len >= data_consumed) {
stream->resp_hds_len -= data_consumed; /* no DATA */
}
else {
if(stream->resp_hds_len) {
data_consumed -= stream->resp_hds_len;
stream->resp_hds_len = 0;
}
if(data_consumed) {
nghttp2_session_consume(ctx->h2, stream->id, data_consumed);
}
}
if(stream->closed) {
CURL_TRC_CF(data, cf, "[%d] DRAIN closed stream", stream->id);
drain_stream(cf, data, stream);
}
}
out:
result = h2_progress_egress(cf, data);
if(result == CURLE_AGAIN) {
/* pending data to send, need to be called again. Ideally, we'd
* monitor the socket for POLLOUT, but we might not be in SENDING
* transfer state any longer and are unable to make this happen.
*/
drain_stream(cf, data, stream);
}
else if(result) {
*err = result;
nread = -1;
}
CURL_TRC_CF(data, cf, "[%d] cf_recv(len=%zu) -> %zd %d, "
"buffered=%zu, window=%d/%d, connection %d/%d",
stream->id, len, nread, *err,
Curl_bufq_len(&stream->recvbuf),
nghttp2_session_get_stream_effective_recv_data_length(
ctx->h2, stream->id),
nghttp2_session_get_stream_effective_local_window_size(
ctx->h2, stream->id),
nghttp2_session_get_local_window_size(ctx->h2),
HTTP2_HUGE_WINDOW_SIZE);
CF_DATA_RESTORE(cf, save);
return nread;
}
static ssize_t h2_submit(struct stream_ctx **pstream,
struct Curl_cfilter *cf, struct Curl_easy *data,
const void *buf, size_t len, CURLcode *err)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct stream_ctx *stream = NULL;
struct dynhds h2_headers;
nghttp2_nv *nva = NULL;
const void *body = NULL;
size_t nheader, bodylen, i;
nghttp2_data_provider data_prd;
int32_t stream_id;
nghttp2_priority_spec pri_spec;
ssize_t nwritten;
Curl_dynhds_init(&h2_headers, 0, DYN_HTTP_REQUEST);
*err = http2_data_setup(cf, data, &stream);
if(*err) {
nwritten = -1;
goto out;
}
nwritten = Curl_h1_req_parse_read(&stream->h1, buf, len, NULL, 0, err);
if(nwritten < 0)
goto out;
if(!stream->h1.done) {
/* need more data */
goto out;
}
DEBUGASSERT(stream->h1.req);
*err = Curl_http_req_to_h2(&h2_headers, stream->h1.req, data);
if(*err) {
nwritten = -1;
goto out;
}
/* no longer needed */
Curl_h1_req_parse_free(&stream->h1);
nva = Curl_dynhds_to_nva(&h2_headers, &nheader);
if(!nva) {
*err = CURLE_OUT_OF_MEMORY;
nwritten = -1;
goto out;
}
h2_pri_spec(data, &pri_spec);
if(!nghttp2_session_check_request_allowed(ctx->h2))
CURL_TRC_CF(data, cf, "send request NOT allowed (via nghttp2)");
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 */
data_prd.read_callback = req_body_read_callback;
data_prd.source.ptr = NULL;
stream_id = nghttp2_submit_request(ctx->h2, &pri_spec, nva, nheader,
&data_prd, data);
break;
default:
stream->upload_left = 0; /* no request body */
stream_id = nghttp2_submit_request(ctx->h2, &pri_spec, nva, nheader,
NULL, data);
}
if(stream_id < 0) {
CURL_TRC_CF(data, cf, "send: nghttp2_submit_request error (%s)%u",
nghttp2_strerror(stream_id), stream_id);
*err = CURLE_SEND_ERROR;
nwritten = -1;
goto out;
}
#define MAX_ACC 60000 /* <64KB to account for some overhead */
if(Curl_trc_is_verbose(data)) {
size_t acc = 0;
infof(data, "[HTTP/2] [%d] OPENED stream for %s",
stream_id, data->state.url);
for(i = 0; i < nheader; ++i) {
acc += nva[i].namelen + nva[i].valuelen;
infof(data, "[HTTP/2] [%d] [%.*s: %.*s]", stream_id,
(int)nva[i].namelen, nva[i].name,
(int)nva[i].valuelen, nva[i].value);
}
if(acc > MAX_ACC) {
infof(data, "[HTTP/2] Warning: The cumulative length of all "
"headers exceeds %d bytes and that could cause the "
"stream to be rejected.", MAX_ACC);
}
}
stream->id = stream_id;
stream->local_window_size = H2_STREAM_WINDOW_SIZE;
if(data->set.max_recv_speed) {
/* We are asked to only receive `max_recv_speed` bytes per second.
* Let's limit our stream window size around that, otherwise the server
* will send in large bursts only. We make the window 50% larger to
* allow for data in flight and avoid stalling. */
curl_off_t n = (((data->set.max_recv_speed - 1) / H2_CHUNK_SIZE) + 1);
n += CURLMAX((n/2), 1);
if(n < (H2_STREAM_WINDOW_SIZE / H2_CHUNK_SIZE) &&
n < (UINT_MAX / H2_CHUNK_SIZE)) {
stream->local_window_size = (uint32_t)n * H2_CHUNK_SIZE;
}
}
body = (const char *)buf + nwritten;
bodylen = len - nwritten;
if(bodylen) {
/* We have request body to send in DATA frame */
ssize_t n = Curl_bufq_write(&stream->sendbuf, body, bodylen, err);
if(n < 0) {
*err = CURLE_SEND_ERROR;
nwritten = -1;
goto out;
}
nwritten += n;
}
out:
CURL_TRC_CF(data, cf, "[%d] submit -> %zd, %d",
stream? stream->id : -1, nwritten, *err);
Curl_safefree(nva);
*pstream = stream;
Curl_dynhds_free(&h2_headers);
return nwritten;
}
static ssize_t cf_h2_send(struct Curl_cfilter *cf, struct Curl_easy *data,
const void *buf, size_t len, CURLcode *err)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct stream_ctx *stream = H2_STREAM_CTX(data);
struct cf_call_data save;
int rv;
ssize_t nwritten;
CURLcode result;
int blocked = 0, was_blocked = 0;
CF_DATA_SAVE(save, cf, data);
if(stream && stream->id != -1) {
if(stream->upload_blocked_len) {
/* the data in `buf` has already been submitted or added to the
* buffers, but have been EAGAINed on the last invocation. */
/* TODO: this assertion triggers in OSSFuzz runs and it is not
* clear why. Disable for now to let OSSFuzz continue its tests. */
DEBUGASSERT(len >= stream->upload_blocked_len);
if(len < stream->upload_blocked_len) {
/* Did we get called again with a smaller `len`? This should not
* happen. We are not prepared to handle that. */
failf(data, "HTTP/2 send again with decreased length (%zd vs %zd)",
len, stream->upload_blocked_len);
*err = CURLE_HTTP2;
nwritten = -1;
goto out;
}
nwritten = (ssize_t)stream->upload_blocked_len;
stream->upload_blocked_len = 0;
was_blocked = 1;
}
else if(stream->closed) {
if(stream->resp_hds_complete) {
/* Server decided to close the stream after having sent us a findl
* response. This is valid if it is not interested in the request
* body. This happens on 30x or 40x responses.
* We silently discard the data sent, since this is not a transport
* error situation. */
CURL_TRC_CF(data, cf, "[%d] discarding data"
"on closed stream with response", stream->id);
*err = CURLE_OK;
nwritten = (ssize_t)len;
goto out;
}
infof(data, "stream %u closed", stream->id);
*err = CURLE_SEND_ERROR;
nwritten = -1;
goto out;
}
else {
/* If stream_id != -1, we have dispatched request HEADERS and
* optionally request body, and now are going to send or sending
* more request body in DATA frame */
nwritten = Curl_bufq_write(&stream->sendbuf, buf, len, err);
if(nwritten < 0 && *err != CURLE_AGAIN)
goto out;
}
if(!Curl_bufq_is_empty(&stream->sendbuf)) {
/* req body data is buffered, resume the potentially suspended stream */
rv = nghttp2_session_resume_data(ctx->h2, stream->id);
if(nghttp2_is_fatal(rv)) {
*err = CURLE_SEND_ERROR;
nwritten = -1;
goto out;
}
}
}
else {
nwritten = h2_submit(&stream, cf, data, buf, len, err);
if(nwritten < 0) {
goto out;
}
DEBUGASSERT(stream);
}
/* Call the nghttp2 send loop and flush to write ALL buffered data,
* headers and/or request body completely out to the network */
result = h2_progress_egress(cf, data);
/* if the stream has been closed in egress handling (nghttp2 does that
* when it does not like the headers, for example */
if(stream && stream->closed && !was_blocked) {
infof(data, "stream %u closed", stream->id);
*err = CURLE_SEND_ERROR;
nwritten = -1;
goto out;
}
else if(result == CURLE_AGAIN) {
blocked = 1;
}
else if(result) {
*err = result;
nwritten = -1;
goto out;
}
else if(stream && !Curl_bufq_is_empty(&stream->sendbuf)) {
/* although we wrote everything that nghttp2 wants to send now,
* there is data left in our stream send buffer unwritten. This may
* be due to the stream's HTTP/2 flow window being exhausted. */
blocked = 1;
}
if(stream && blocked && nwritten > 0) {
/* Unable to send all data, due to connection blocked or H2 window
* exhaustion. Data is left in our stream buffer, or nghttp2's internal
* frame buffer or our network out buffer. */
size_t rwin = nghttp2_session_get_stream_remote_window_size(ctx->h2,
stream->id);
/* Whatever the cause, we need to return CURL_EAGAIN for this call.
* We have unwritten state that needs us being invoked again and EAGAIN
* is the only way to ensure that. */
stream->upload_blocked_len = nwritten;
CURL_TRC_CF(data, cf, "[%d] cf_send(len=%zu) BLOCK: win %u/%zu "
"blocked_len=%zu",
stream->id, len,
nghttp2_session_get_remote_window_size(ctx->h2), rwin,
nwritten);
*err = CURLE_AGAIN;
nwritten = -1;
goto out;
}
else if(should_close_session(ctx)) {
/* nghttp2 thinks this session is done. If the stream has not been
* closed, this is an error state for out transfer */
if(stream->closed) {
nwritten = http2_handle_stream_close(cf, data, stream, err);
}
else {
CURL_TRC_CF(data, cf, "send: nothing to do in this session");
*err = CURLE_HTTP2;
nwritten = -1;
}
}
out:
if(stream) {
CURL_TRC_CF(data, cf, "[%d] cf_send(len=%zu) -> %zd, %d, "
"upload_left=%" CURL_FORMAT_CURL_OFF_T ", "
"h2 windows %d-%d (stream-conn), "
"buffers %zu-%zu (stream-conn)",
stream->id, len, nwritten, *err,
stream->upload_left,
nghttp2_session_get_stream_remote_window_size(
ctx->h2, stream->id),
nghttp2_session_get_remote_window_size(ctx->h2),
Curl_bufq_len(&stream->sendbuf),
Curl_bufq_len(&ctx->outbufq));
}
else {
CURL_TRC_CF(data, cf, "cf_send(len=%zu) -> %zd, %d, "
"connection-window=%d, nw_send_buffer(%zu)",
len, nwritten, *err,
nghttp2_session_get_remote_window_size(ctx->h2),
Curl_bufq_len(&ctx->outbufq));
}
CF_DATA_RESTORE(cf, save);
return nwritten;
}
static void cf_h2_adjust_pollset(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct easy_pollset *ps)
{
struct cf_h2_ctx *ctx = cf->ctx;
bool want_recv = CURL_WANT_RECV(data);
bool want_send = CURL_WANT_SEND(data);
if(ctx->h2 && (want_recv || want_send)) {
struct stream_ctx *stream = H2_STREAM_CTX(data);
curl_socket_t sock = Curl_conn_cf_get_socket(cf, data);
struct cf_call_data save;
bool c_exhaust, s_exhaust;
CF_DATA_SAVE(save, cf, data);
c_exhaust = !nghttp2_session_get_remote_window_size(ctx->h2);
s_exhaust = stream && stream->id >= 0 &&
!nghttp2_session_get_stream_remote_window_size(ctx->h2,
stream->id);
want_recv = (want_recv || c_exhaust || s_exhaust);
want_send = (!s_exhaust && want_send) ||
(!c_exhaust && nghttp2_session_want_write(ctx->h2));
Curl_pollset_set(data, ps, sock, want_recv, want_send);
CF_DATA_RESTORE(cf, save);
}
}
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;
}
result = h2_progress_ingress(cf, data);
if(result)
goto out;
/* Send out our SETTINGS and ACKs and such. If that blocks, we
* have it buffered and can count this filter as being connected */
result = h2_progress_egress(cf, data);
if(result == CURLE_AGAIN)
result = CURLE_OK;
else if(result)
goto out;
*done = TRUE;
cf->connected = TRUE;
result = CURLE_OK;
out:
CURL_TRC_CF(data, cf, "cf_connect() -> %d, %d, ", result, *done);
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);
}
if(cf->next)
cf->next->cft->do_close(cf->next, data);
}
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)
{
#ifdef NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE
struct cf_h2_ctx *ctx = cf->ctx;
struct stream_ctx *stream = H2_STREAM_CTX(data);
DEBUGASSERT(data);
if(ctx && ctx->h2 && stream) {
uint32_t window = pause? 0 : stream->local_window_size;
int rv = nghttp2_session_set_local_window_size(ctx->h2,
NGHTTP2_FLAG_NONE,
stream->id,
window);
if(rv) {
failf(data, "nghttp2_session_set_local_window_size() failed: %s(%d)",
nghttp2_strerror(rv), rv);
return CURLE_HTTP2;
}
if(!pause)
drain_stream(cf, data, stream);
/* attempt to send the window update */
(void)h2_progress_egress(cf, data);
if(!pause) {
/* Unpausing a h2 transfer, requires it to be run again. The server
* may send new DATA on us increasing the flow window, and it may
* not. We may have already buffered and exhausted the new window
* by operating on things in flight during the handling of other
* transfers. */
drain_stream(cf, data, stream);
Curl_expire(data, 0, EXPIRE_RUN_NOW);
}
DEBUGF(infof(data, "Set HTTP/2 window size to %u for stream %u",
window, stream->id));
#ifdef DEBUGBUILD
{
/* read out the stream local window again */
uint32_t window2 =
nghttp2_session_get_stream_local_window_size(ctx->h2,
stream->id);
DEBUGF(infof(data, "HTTP/2 window size is now %u for stream %u",
window2, 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:
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_DETACH:
http2_data_done(cf, data, TRUE);
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;
struct stream_ctx *stream = H2_STREAM_CTX(data);
if(ctx && (!Curl_bufq_is_empty(&ctx->inbufq)
|| (stream && !Curl_bufq_is_empty(&stream->sendbuf))
|| (stream && !Curl_bufq_is_empty(&stream->recvbuf))))
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));
CURL_TRC_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_LVL_NONE,
cf_h2_destroy,
cf_h2_connect,
cf_h2_close,
Curl_cf_def_get_host,
cf_h2_adjust_pollset,
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(1, sizeof(*ctx));
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(1, sizeof(*ctx));
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;
}
static 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, "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;
Curl_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;
Curl_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, "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 > 0) {
/* Remaining data from the protocol switch reply is already using
* the switched protocol, ie. HTTP/2. We add that to the network
* inbufq. */
ssize_t copied;
copied = Curl_bufq_write(&ctx->inbufq,
(const unsigned char *)mem, nread, &result);
if(copied < 0) {
failf(data, "error on copying HTTP Upgrade response: %d", result);
return CURLE_RECV_ERROR;
}
if((size_t)copied < nread) {
failf(data, "connection buffer size could not take all data "
"from HTTP Upgrade response header: copied=%zd, datalen=%zu",
copied, nread);
return CURLE_HTTP2;
}
infof(data, "Copied HTTP/2 data in stream buffer to connection buffer"
" after upgrade: len=%zu", 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;
Curl_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 stream_ctx *stream = H2_STREAM_CTX(data);
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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