branch: master
http2.c
96421 bytesRaw
/***************************************************************************
* _ _ ____ _
* 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"
#if !defined(CURL_DISABLE_HTTP) && defined(USE_NGHTTP2)
#include <nghttp2/nghttp2.h>
#include "urldata.h"
#include "bufq.h"
#include "uint-hash.h"
#include "http1.h"
#include "http2.h"
#include "http.h"
#include "sendf.h"
#include "curl_trc.h"
#include "select.h"
#include "curlx/base64.h"
#include "multiif.h"
#include "progress.h"
#include "url.h"
#include "urlapi-int.h"
#include "cfilters.h"
#include "connect.h"
#include "transfer.h"
#include "bufref.h"
#include "curlx/dynbuf.h"
#include "headers.h"
#if (NGHTTP2_VERSION_NUM < 0x010c00)
#error too old nghttp2 version, upgrade!
#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)
/* connection window size */
#define H2_CONN_WINDOW_SIZE (10 * 1024 * 1024)
/* on receiving from TLS, we prep for holding a full stream window */
#define H2_NW_RECV_CHUNKS (H2_CONN_WINDOW_SIZE / H2_CHUNK_SIZE)
/* on send into TLS, we want to accumulate small frames */
#define H2_NW_SEND_CHUNKS 1
/* this is how much we want "in flight" for a stream, unthrottled */
#define H2_STREAM_WINDOW_SIZE_MAX (10 * 1024 * 1024)
/* this is how much we want "in flight" for a stream, initially, IFF
* nghttp2 allows us to tweak the local window size. */
#if NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE
#define H2_STREAM_WINDOW_SIZE_INITIAL (64 * 1024)
#else
#define H2_STREAM_WINDOW_SIZE_INITIAL H2_STREAM_WINDOW_SIZE_MAX
#endif
/* 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_CONN_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. 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_MAX)
#define H2_SETTINGS_IV_LEN 3
#define H2_BINSETTINGS_LEN 80
struct cf_h2_ctx {
nghttp2_session *h2;
/* 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 */
struct dynbuf scratch; /* scratch buffer for temp use */
struct uint_hash streams; /* hash of `data->mid` to `h2_stream_ctx` */
size_t drain_total; /* sum of all stream's UrlState drain */
uint32_t initial_win_size; /* current initial window size (settings) */
uint32_t max_concurrent_streams;
uint32_t goaway_error; /* goaway error code from server */
int32_t remote_max_sid; /* max id processed by server */
int32_t local_max_sid; /* max id processed by us */
BIT(initialized);
BIT(via_h1_upgrade);
BIT(conn_closed);
BIT(rcvd_goaway);
BIT(sent_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
/**
* All about the H2 internals of a stream
*/
struct h2_stream_ctx {
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 */
curl_off_t nrcvd_data; /* number of DATA bytes received */
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 */
CURLcode xfer_result; /* Result of writing out response */
int32_t local_window_size; /* the local recv window size */
int32_t id; /* HTTP/2 protocol identifier for stream */
BIT(resp_hds_complete); /* we have a complete, final response */
BIT(closed); /* TRUE on stream close */
BIT(reset); /* TRUE on stream reset */
BIT(reset_by_server); /* TRUE on stream reset by server */
BIT(close_handled); /* TRUE if stream closure is handled by libcurl */
BIT(bodystarted);
BIT(body_eos); /* the complete body has been added to `sendbuf` and
* is being/has been processed from there. */
BIT(write_paused); /* stream write is paused */
};
static void free_push_headers(struct h2_stream_ctx *stream)
{
size_t i;
for(i = 0; i < stream->push_headers_used; i++)
curlx_free(stream->push_headers[i]);
Curl_safefree(stream->push_headers);
stream->push_headers_used = 0;
}
static void h2_stream_ctx_free(struct h2_stream_ctx *stream)
{
Curl_bufq_free(&stream->sendbuf);
Curl_h1_req_parse_free(&stream->h1);
Curl_dynhds_free(&stream->resp_trailers);
free_push_headers(stream);
curlx_free(stream);
}
static void h2_stream_hash_free(unsigned int id, void *stream)
{
(void)id;
DEBUGASSERT(stream);
h2_stream_ctx_free((struct h2_stream_ctx *)stream);
}
static void cf_h2_ctx_init(struct cf_h2_ctx *ctx, bool via_h1_upgrade)
{
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);
curlx_dyn_init(&ctx->scratch, CURL_MAX_HTTP_HEADER);
Curl_uint32_hash_init(&ctx->streams, 63, h2_stream_hash_free);
ctx->remote_max_sid = 2147483647;
ctx->via_h1_upgrade = via_h1_upgrade;
ctx->initialized = TRUE;
}
static void cf_h2_ctx_free(struct cf_h2_ctx *ctx)
{
if(ctx && ctx->initialized) {
Curl_bufq_free(&ctx->inbufq);
Curl_bufq_free(&ctx->outbufq);
Curl_bufcp_free(&ctx->stream_bufcp);
curlx_dyn_free(&ctx->scratch);
Curl_uint32_hash_destroy(&ctx->streams);
memset(ctx, 0, sizeof(*ctx));
}
curlx_free(ctx);
}
static void cf_h2_ctx_close(struct cf_h2_ctx *ctx)
{
if(ctx->h2) {
nghttp2_session_del(ctx->h2);
ctx->h2 = NULL;
}
}
static uint32_t cf_h2_initial_win_size(struct Curl_easy *data)
{
#if NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE
/* If the transfer has a rate-limit lower than the default initial
* stream window size, use that. It needs to be at least 8k or servers
* may be unhappy. */
curl_off_t rps = Curl_rlimit_per_step(&data->progress.dl.rlimit);
if((rps > 0) && (rps < H2_STREAM_WINDOW_SIZE_INITIAL))
return CURLMAX((uint32_t)rps, 8192);
#endif
return H2_STREAM_WINDOW_SIZE_INITIAL;
}
static size_t populate_settings(nghttp2_settings_entry *iv,
struct Curl_easy *data,
struct cf_h2_ctx *ctx)
{
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 = cf_h2_initial_win_size(data);
if(ctx)
ctx->initial_win_size = iv[1].value;
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];
size_t ivlen;
ivlen = populate_settings(iv, data, NULL);
/* this returns number of bytes it wrote or a negative number on error. */
return nghttp2_pack_settings_payload(binsettings, H2_BINSETTINGS_LEN,
iv, ivlen);
}
static CURLcode cf_h2_update_settings(struct cf_h2_ctx *ctx,
uint32_t initial_win_size)
{
nghttp2_settings_entry entry;
entry.settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
entry.value = initial_win_size;
if(nghttp2_submit_settings(ctx->h2, NGHTTP2_FLAG_NONE, &entry, 1))
return CURLE_SEND_ERROR;
ctx->initial_win_size = initial_win_size;
return CURLE_OK;
}
#define H2_STREAM_CTX(ctx, data) \
((struct h2_stream_ctx *)( \
(data) ? Curl_uint32_hash_get(&(ctx)->streams, (data)->mid) : NULL))
static struct h2_stream_ctx *h2_stream_ctx_create(struct cf_h2_ctx *ctx)
{
struct h2_stream_ctx *stream;
(void)ctx;
stream = curlx_calloc(1, sizeof(*stream));
if(!stream)
return NULL;
stream->id = -1;
Curl_bufq_initp(&stream->sendbuf, &ctx->stream_bufcp,
H2_STREAM_SEND_CHUNKS, BUFQ_OPT_NONE);
Curl_h1_req_parse_init(&stream->h1, H1_PARSE_DEFAULT_MAX_LINE_LEN);
Curl_dynhds_init(&stream->resp_trailers, 0, DYN_HTTP_REQUEST);
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_INITIAL;
stream->nrcvd_data = 0;
return stream;
}
#ifdef NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE
static int32_t cf_h2_get_desired_local_win(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
curl_off_t avail = Curl_rlimit_avail(&data->progress.dl.rlimit,
Curl_pgrs_now(data));
(void)cf;
if(avail < CURL_OFF_T_MAX) { /* limit in place */
if(avail <= 0)
return 0;
else if(avail < INT32_MAX)
return (int32_t)avail;
}
return H2_STREAM_WINDOW_SIZE_MAX;
}
static CURLcode cf_h2_update_local_win(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct h2_stream_ctx *stream)
{
struct cf_h2_ctx *ctx = cf->ctx;
int32_t dwsize;
int rv;
dwsize = (stream->write_paused || stream->xfer_result) ?
0 : cf_h2_get_desired_local_win(cf, data);
if(dwsize != stream->local_window_size) {
int32_t wsize = nghttp2_session_get_stream_effective_local_window_size(
ctx->h2, stream->id);
if(dwsize > wsize) {
rv = nghttp2_session_set_local_window_size(ctx->h2, NGHTTP2_FLAG_NONE,
stream->id, dwsize);
if(rv) {
failf(data, "[%d] nghttp2 set_local_window_size(%d) failed: "
"%s(%d)", stream->id, dwsize, nghttp2_strerror(rv), rv);
return CURLE_HTTP2;
}
rv = nghttp2_submit_window_update(ctx->h2, NGHTTP2_FLAG_NONE,
stream->id, dwsize - wsize);
if(rv) {
failf(data, "[%d] nghttp2_submit_window_update() failed: "
"%s(%d)", stream->id, nghttp2_strerror(rv), rv);
return CURLE_HTTP2;
}
stream->local_window_size = dwsize;
CURL_TRC_CF(data, cf, "[%d] local window update by %d",
stream->id, dwsize - wsize);
}
else {
rv = nghttp2_session_set_local_window_size(ctx->h2, NGHTTP2_FLAG_NONE,
stream->id, dwsize);
if(rv) {
failf(data, "[%d] nghttp2_session_set_local_window_size() failed: "
"%s(%d)", stream->id, nghttp2_strerror(rv), rv);
return CURLE_HTTP2;
}
stream->local_window_size = dwsize;
CURL_TRC_CF(data, cf, "[%d] local window size now %d",
stream->id, dwsize);
}
}
return CURLE_OK;
}
#else /* NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE */
static CURLcode cf_h2_update_local_win(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct h2_stream_ctx *stream)
{
(void)cf;
(void)data;
(void)stream;
return CURLE_OK;
}
#endif /* !NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE */
static CURLcode http2_data_setup(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct h2_stream_ctx **pstream)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct h2_stream_ctx *stream;
(void)cf;
DEBUGASSERT(data);
if(!data)
return CURLE_BAD_FUNCTION_ARGUMENT;
stream = H2_STREAM_CTX(ctx, data);
if(stream) {
*pstream = stream;
return CURLE_OK;
}
stream = h2_stream_ctx_create(ctx);
if(!stream)
return CURLE_OUT_OF_MEMORY;
if(!Curl_uint32_hash_set(&ctx->streams, data->mid, stream)) {
h2_stream_ctx_free(stream);
return CURLE_OUT_OF_MEMORY;
}
*pstream = stream;
return CURLE_OK;
}
static CURLcode nw_out_flush(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_h2_ctx *ctx = cf->ctx;
size_t nwritten;
CURLcode result;
if(Curl_bufq_is_empty(&ctx->outbufq))
return CURLE_OK;
result = Curl_cf_send_bufq(cf->next, data, &ctx->outbufq, NULL, 0,
&nwritten);
if(result) {
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;
}
static void http2_data_done(struct Curl_cfilter *cf, struct Curl_easy *data)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct h2_stream_ctx *stream = H2_STREAM_CTX(ctx, data);
DEBUGASSERT(ctx);
if(!stream || !ctx->initialized)
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;
nghttp2_submit_rst_stream(ctx->h2, NGHTTP2_FLAG_NONE,
stream->id, NGHTTP2_STREAM_CLOSED);
flush_egress = TRUE;
}
if(flush_egress) {
(void)nghttp2_session_send(ctx->h2);
(void)nw_out_flush(cf, data);
}
}
Curl_uint32_hash_remove(&ctx->streams, data->mid);
}
static int h2_client_new(struct Curl_cfilter *cf,
nghttp2_session_callbacks *cbs)
{
struct cf_h2_ctx *ctx = cf->ctx;
nghttp2_option *o;
nghttp2_mem mem = { NULL, Curl_nghttp2_malloc, Curl_nghttp2_free,
Curl_nghttp2_calloc, Curl_nghttp2_realloc };
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_new3(&ctx->h2, cbs, cf, o, &mem);
nghttp2_option_del(o);
return rc;
}
/*
* 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 CURLcode h2_process_pending_input(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_h2_ctx *ctx = cf->ctx;
const unsigned char *buf;
size_t blen, nread;
ssize_t rv;
while(Curl_bufq_peek(&ctx->inbufq, &buf, &blen)) {
rv = nghttp2_session_mem_recv(ctx->h2, (const uint8_t *)buf, blen);
if(!curlx_sztouz(rv, &nread)) {
failf(data, "nghttp2 recv error %zd: %s", rv, nghttp2_strerror((int)rv));
return CURLE_HTTP2;
}
Curl_bufq_skip(&ctx->inbufq, nread);
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 CURLE_OK;
}
/*
* The server may send us data at any point (e.g. PING frames). Therefore, we
* cannot assume that an HTTP/2 socket is dead 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 have sent off a request and the connection is
not in use by any other transfer, there should not be any data here,
only "protocol frames" */
CURLcode result;
size_t nread;
*input_pending = FALSE;
result = Curl_cf_recv_bufq(cf->next, data, &ctx->inbufq, 0, &nread);
if(!result) {
CURL_TRC_CF(data, cf, "%zu bytes stray data read before trying "
"h2 connection", nread);
result = h2_process_pending_input(cf, data);
if(result)
/* 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)curl_msnprintf(p, len, "nghttp2/%s", h2->version_str);
}
/*
* The implementation of nghttp2_send_callback type. Here we write |data| with
* size |length| to the network and return the number of bytes actually
* written. See the documentation of nghttp2_send_callback for the details.
*/
static ssize_t send_callback(nghttp2_session *h2,
const uint8_t *buf, size_t blen, int flags,
void *userp)
{
struct Curl_cfilter *cf = userp;
struct cf_h2_ctx *ctx = cf->ctx;
struct Curl_easy *data = CF_DATA_CURRENT(cf);
size_t nwritten;
CURLcode result = CURLE_OK;
(void)h2;
(void)flags;
DEBUGASSERT(data);
if(!cf->connected)
result = Curl_bufq_write(&ctx->outbufq, buf, blen, &nwritten);
else
result = Curl_cf_send_bufq(cf->next, data, &ctx->outbufq, buf, blen,
&nwritten);
if(result) {
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 > SSIZE_MAX) ?
NGHTTP2_ERR_CALLBACK_FAILURE : (ssize_t)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;
struct h2_stream_ctx *stream;
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 {
if(h->stream && num < h->stream->push_headers_used)
return h->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 *name)
{
struct h2_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 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) || !name || !name[0] ||
!strcmp(name, ":") || strchr(name + 1, ':'))
return NULL;
stream = h->stream;
if(!stream)
return NULL;
len = strlen(name);
for(i = 0; i < stream->push_headers_used; i++) {
if(!strncmp(name, 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) {
struct h2_stream_ctx *second_stream;
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);
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;
Curl_bufref_set(&data->state.url, url, 0, curl_free);
return 0;
}
static void discard_newhandle(struct Curl_cfilter *cf,
struct Curl_easy *newhandle)
{
http2_data_done(cf, newhandle);
(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 h2_stream_ctx *stream;
struct h2_stream_ctx *newstream;
struct curl_pushheaders heads;
CURLMcode mresult;
CURLcode result;
/* 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;
}
stream = H2_STREAM_CTX(ctx, data);
if(!stream) {
failf(data, "Internal NULL stream");
discard_newhandle(cf, newhandle);
rv = CURL_PUSH_DENY;
goto fail;
}
heads.data = data;
heads.stream = stream;
heads.frame = frame;
rv = set_transfer_url(newhandle, &heads);
if(rv) {
CURL_TRC_CF(data, cf, "[%d] PUSH_PROMISE, failed to set URL -> %d",
frame->promised_stream_id, rv);
discard_newhandle(cf, 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 */
free_push_headers(stream);
if(rv) {
DEBUGASSERT((rv > CURL_PUSH_OK) && (rv <= CURL_PUSH_ERROROUT));
/* denied, kill off the new handle again */
CURL_TRC_CF(data, cf, "[%d] PUSH_PROMISE, denied by application -> %d",
frame->promised_stream_id, rv);
discard_newhandle(cf, newhandle);
goto fail;
}
/* approved, add to the multi handle for processing. This
* assigns newhandle->mid. For the new `mid` we assign the
* h2_stream instance and remember the stream_id already known. */
mresult = Curl_multi_add_perform(data->multi, newhandle, cf->conn);
if(mresult) {
infof(data, "failed to add handle to multi");
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(newstream);
newstream->id = frame->promised_stream_id;
newhandle->req.maxdownload = -1;
newhandle->req.size = -1;
CURL_TRC_CF(data, cf, "promise easy handle added to multi, mid=%u",
newhandle->mid);
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);
discard_newhandle(cf, newhandle);
rv = CURL_PUSH_DENY;
goto fail;
}
/* success, remember max stream id processed */
if(newstream->id > ctx->local_max_sid)
ctx->local_max_sid = newstream->id;
}
else {
CURL_TRC_CF(data, cf, "Got PUSH_PROMISE, ignore it");
rv = CURL_PUSH_DENY;
}
fail:
return rv;
}
static void h2_xfer_write_resp_hd(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct h2_stream_ctx *stream,
const char *buf, size_t blen, bool eos)
{
/* If we already encountered an error, skip further writes */
if(!stream->xfer_result) {
stream->xfer_result = Curl_xfer_write_resp_hd(data, buf, blen, eos);
if(!stream->xfer_result && !eos)
stream->xfer_result = cf_h2_update_local_win(cf, data, stream);
if(stream->xfer_result)
CURL_TRC_CF(data, cf, "[%d] error %d writing %zu bytes of headers",
stream->id, stream->xfer_result, blen);
}
}
static void h2_xfer_write_resp(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct h2_stream_ctx *stream,
const char *buf, size_t blen, bool eos)
{
/* If we already encountered an error, skip further writes */
if(!stream->xfer_result)
stream->xfer_result = Curl_xfer_write_resp(data, buf, blen, eos);
/* If the transfer write is errored, we do not want any more data */
if(stream->xfer_result) {
struct cf_h2_ctx *ctx = cf->ctx;
CURL_TRC_CF(data, cf, "[%d] error %d writing %zu bytes of data, "
"RST-ing stream",
stream->id, stream->xfer_result, blen);
nghttp2_submit_rst_stream(ctx->h2, 0, stream->id,
(uint32_t)NGHTTP2_ERR_CALLBACK_FAILURE);
}
else if(!stream->write_paused && Curl_xfer_write_is_paused(data)) {
CURL_TRC_CF(data, cf, "[%d] stream output paused", stream->id);
stream->write_paused = TRUE;
}
else if(stream->write_paused && !Curl_xfer_write_is_paused(data)) {
CURL_TRC_CF(data, cf, "[%d] stream output unpaused", stream->id);
stream->write_paused = FALSE;
}
if(!stream->xfer_result && !eos)
stream->xfer_result = cf_h2_update_local_win(cf, data, stream);
}
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 h2_stream_ctx *stream = H2_STREAM_CTX(ctx, data);
int32_t stream_id = frame->hd.stream_id;
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:
CURL_TRC_CF(data, cf, "[%d] DATA, window=%d/%d",
stream_id,
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;
}
}
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;
else
stream->status_code = -1;
h2_xfer_write_resp_hd(cf, data, stream, STRCONST("\r\n"),
(bool)stream->closed);
if(stream->status_code / 100 != 1) {
stream->resp_hds_complete = TRUE;
}
Curl_multi_mark_dirty(data);
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:
if(frame->rst_stream.error_code)
stream->reset_by_server = TRUE;
Curl_multi_mark_dirty(data);
break;
case NGHTTP2_WINDOW_UPDATE:
if(CURL_REQ_WANT_SEND(data) && Curl_bufq_is_empty(&stream->sendbuf)) {
/* need more data, force processing of transfer */
Curl_multi_mark_dirty(data);
}
else if(!Curl_bufq_is_empty(&stream->sendbuf)) {
/* resume the potentially suspended stream */
rv = nghttp2_session_resume_data(ctx->h2, stream->id);
if(nghttp2_is_fatal(rv))
return CURLE_SEND_ERROR;
}
break;
default:
break;
}
if(frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
if(!stream->closed && !stream->body_eos &&
((stream->status_code >= 400) || (stream->status_code < 200))) {
/* The server did not give us a positive response and we are not
* done uploading the request body. We need to stop doing that and
* also inform the server that we aborted our side. */
CURL_TRC_CF(data, cf, "[%d] EOS frame with unfinished upload and "
"HTTP status %d, abort upload by RST",
stream_id, stream->status_code);
nghttp2_submit_rst_stream(ctx->h2, NGHTTP2_FLAG_NONE,
stream->id, NGHTTP2_STREAM_CLOSED);
stream->closed = TRUE;
}
Curl_multi_mark_dirty(data);
}
return CURLE_OK;
}
#ifdef CURLVERBOSE
int Curl_nghttp2_fr_print(const nghttp2_frame *frame, char *buffer,
size_t blen)
{
switch(frame->hd.type) {
case NGHTTP2_DATA: {
return curl_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 curl_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 curl_msnprintf(buffer, blen,
"FRAME[PRIORITY, len=%d, flags=%d]",
(int)frame->hd.length, frame->hd.flags);
}
case NGHTTP2_RST_STREAM: {
return curl_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 curl_msnprintf(buffer, blen, "FRAME[SETTINGS, ack=1]");
}
return curl_msnprintf(buffer, blen,
"FRAME[SETTINGS, len=%d]", (int)frame->hd.length);
}
case NGHTTP2_PUSH_PROMISE:
return curl_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 curl_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 = CURL_ARRAYSIZE(scratch);
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 curl_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 curl_msnprintf(buffer, blen,
"FRAME[WINDOW_UPDATE, incr=%d]",
frame->window_update.window_size_increment);
}
default:
return curl_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 cf_h2_ctx *ctx = cf->ctx;
struct Curl_easy *data = CF_DATA_CURRENT(cf);
(void)session;
DEBUGASSERT(data);
if(Curl_trc_cf_is_verbose(cf, data)) {
char buffer[256];
int len;
len = Curl_nghttp2_fr_print(frame, buffer, sizeof(buffer) - 1);
buffer[len] = 0;
CURL_TRC_CF(data, cf, "[%d] -> %s", frame->hd.stream_id, buffer);
}
if((frame->hd.type == NGHTTP2_GOAWAY) && !ctx->sent_goaway) {
/* A GOAWAY not initiated by us, but by nghttp2 itself on detecting
* a protocol error on the connection */
failf(data, "nghttp2 shuts down connection with error %d: %s",
frame->goaway.error_code,
nghttp2_http2_strerror(frame->goaway.error_code));
}
return 0;
}
#endif /* CURLVERBOSE */
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);
#ifdef CURLVERBOSE
if(Curl_trc_cf_is_verbose(cf, data)) {
char buffer[256];
int len;
len = Curl_nghttp2_fr_print(frame, buffer, sizeof(buffer) - 1);
buffer[len] = 0;
CURL_TRC_CF(data, cf, "[%d] <- %s", frame->hd.stream_id, buffer);
}
#endif /* CURLVERBOSE */
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_REQ_WANT_SEND(data))
Curl_multi_mark_dirty(data);
}
break;
}
case NGHTTP2_GOAWAY:
ctx->rcvd_goaway = TRUE;
ctx->goaway_error = frame->goaway.error_code;
ctx->remote_max_sid = frame->goaway.last_stream_id;
if(data) {
infof(data, "received GOAWAY, error=%u, last_stream=%u",
ctx->goaway_error, ctx->remote_max_sid);
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 cf_h2_on_invalid_frame_recv(nghttp2_session *session,
const nghttp2_frame *frame,
int ngerr, void *userp)
{
struct Curl_cfilter *cf = userp;
struct cf_h2_ctx *ctx = cf->ctx;
struct Curl_easy *data;
int32_t stream_id = frame->hd.stream_id;
data = nghttp2_session_get_stream_user_data(session, stream_id);
if(data) {
struct h2_stream_ctx *stream;
#ifdef CURLVERBOSE
char buffer[256];
int len;
len = Curl_nghttp2_fr_print(frame, buffer, sizeof(buffer) - 1);
buffer[len] = 0;
failf(data, "[HTTP2] [%d] received invalid frame: %s, error %d: %s",
stream_id, buffer, ngerr, nghttp2_strerror(ngerr));
#endif /* CURLVERBOSE */
stream = H2_STREAM_CTX(ctx, data);
if(stream) {
nghttp2_submit_rst_stream(ctx->h2, NGHTTP2_FLAG_NONE,
stream->id, NGHTTP2_STREAM_CLOSED);
stream->error = ngerr;
stream->closed = TRUE;
stream->reset = TRUE;
return 0; /* keep the connection alive */
}
}
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
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 h2_stream_ctx *stream;
struct Curl_easy *data_s;
(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(ctx, data_s);
if(!stream)
return NGHTTP2_ERR_CALLBACK_FAILURE;
h2_xfer_write_resp(cf, data_s, stream, (const char *)mem, len, FALSE);
nghttp2_session_consume(ctx->h2, stream_id, len);
stream->nrcvd_data += (curl_off_t)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 cf_h2_ctx *ctx = cf->ctx;
struct Curl_easy *data_s, *call_data = CF_DATA_CURRENT(cf);
struct h2_stream_ctx *stream;
int rv;
(void)session;
DEBUGASSERT(call_data);
/* stream id 0 is the connection, do not look there for streams. */
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(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;
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);
Curl_multi_mark_dirty(data_s);
/* 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 cf_h2_ctx *ctx = cf->ctx;
struct h2_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(ctx, data_s);
if(!stream || !stream->bodystarted) {
return 0;
}
return 0;
}
static void cf_h2_header_error(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct h2_stream_ctx *stream,
CURLcode result)
{
struct cf_h2_ctx *ctx = cf->ctx;
failf(data, "Error receiving HTTP2 header: %d(%s)", result,
curl_easy_strerror(result));
if(stream) {
nghttp2_submit_rst_stream(ctx->h2, NGHTTP2_FLAG_NONE,
stream->id, NGHTTP2_STREAM_CLOSED);
stream->closed = TRUE;
stream->reset = TRUE;
}
}
/* 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 cf_h2_ctx *ctx = cf->ctx;
struct h2_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(!GOOD_EASY_HANDLE(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(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((namelen == (sizeof(HTTP_PSEUDO_AUTHORITY) - 1)) &&
!strncmp(HTTP_PSEUDO_AUTHORITY, (const char *)name, namelen)) {
/* pseudo headers are lower case */
int rc = 0;
char *check = curl_maprintf("%s:%d", cf->conn->host.name,
cf->conn->remote_port);
if(!check)
/* no memory */
return NGHTTP2_ERR_CALLBACK_FAILURE;
if(!curl_strequal(check, (const char *)value) &&
((cf->conn->remote_port != cf->conn->given->defport) ||
!curl_strequal(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;
}
curlx_free(check);
if(rc)
return rc;
}
if(!stream->push_headers) {
stream->push_headers_alloc = 10;
stream->push_headers = curlx_malloc(stream->push_headers_alloc *
sizeof(char *));
if(!stream->push_headers)
return NGHTTP2_ERR_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");
free_push_headers(stream);
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
stream->push_headers_alloc *= 2;
headp = curlx_realloc(stream->push_headers,
stream->push_headers_alloc * sizeof(char *));
if(!headp) {
free_push_headers(stream);
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
stream->push_headers = headp;
}
h = curl_maprintf("%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) {
cf_h2_header_error(cf, data_s, stream, 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];
size_t hlen;
result = Curl_http_decode_status(&stream->status_code,
(const char *)value, valuelen);
if(result) {
cf_h2_header_error(cf, data_s, stream, result);
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
hlen = curl_msnprintf(buffer, sizeof(buffer), HTTP_PSEUDO_STATUS ":%u\r",
stream->status_code);
result = Curl_headers_push(data_s, buffer, hlen, CURLH_PSEUDO);
if(result) {
cf_h2_header_error(cf, data_s, stream, result);
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
curlx_dyn_reset(&ctx->scratch);
result = curlx_dyn_addn(&ctx->scratch, STRCONST("HTTP/2 "));
if(!result)
result = curlx_dyn_addn(&ctx->scratch, value, valuelen);
if(!result)
result = curlx_dyn_addn(&ctx->scratch, STRCONST(" \r\n"));
if(!result)
h2_xfer_write_resp_hd(cf, data_s, stream, curlx_dyn_ptr(&ctx->scratch),
curlx_dyn_len(&ctx->scratch), FALSE);
if(result) {
cf_h2_header_error(cf, data_s, stream, result);
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
/* if we receive data for another handle, wake that up */
if(CF_DATA_CURRENT(cf) != data_s)
Curl_multi_mark_dirty(data_s);
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 */
curlx_dyn_reset(&ctx->scratch);
result = curlx_dyn_addn(&ctx->scratch, (const char *)name, namelen);
if(!result)
result = curlx_dyn_addn(&ctx->scratch, STRCONST(": "));
if(!result)
result = curlx_dyn_addn(&ctx->scratch, (const char *)value, valuelen);
if(!result)
result = curlx_dyn_addn(&ctx->scratch, STRCONST("\r\n"));
if(!result)
h2_xfer_write_resp_hd(cf, data_s, stream, curlx_dyn_ptr(&ctx->scratch),
curlx_dyn_len(&ctx->scratch), FALSE);
if(result) {
cf_h2_header_error(cf, data_s, stream, result);
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
/* if we receive data for another handle, wake that up */
if(CF_DATA_CURRENT(cf) != data_s)
Curl_multi_mark_dirty(data_s);
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 cf_h2_ctx *ctx = cf->ctx;
struct Curl_easy *data_s;
struct h2_stream_ctx *stream = NULL;
CURLcode result;
ssize_t nread;
size_t n;
(void)source;
(void)cf;
if(!stream_id)
return NGHTTP2_ERR_INVALID_ARGUMENT;
/* 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(ctx, data_s);
if(!stream)
return NGHTTP2_ERR_CALLBACK_FAILURE;
result = Curl_bufq_read(&stream->sendbuf, buf, length, &n);
if(result) {
if(result != CURLE_AGAIN)
return NGHTTP2_ERR_CALLBACK_FAILURE;
nread = 0;
}
else
nread = (ssize_t)n;
CURL_TRC_CF(data_s, cf, "[%d] req_body_read(len=%zu) eos=%d -> %zd, %d",
stream_id, length, stream->body_eos, nread, result);
if(stream->body_eos && Curl_bufq_is_empty(&stream->sendbuf)) {
*data_flags = NGHTTP2_DATA_FLAG_EOF;
return nread;
}
return (nread == 0) ? NGHTTP2_ERR_DEFERRED : nread;
}
#ifdef CURLVERBOSE
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 rc;
size_t binlen; /* length of the binsettings data */
rc = populate_binsettings(binsettings, data);
if(!curlx_sztouz(rc, &binlen) || !binlen) {
failf(data, "nghttp2 unexpectedly failed on pack_settings_payload");
curlx_dyn_free(req);
return CURLE_FAILED_INIT;
}
result = curlx_base64url_encode(binsettings, binlen, &base64, &blen);
if(result) {
curlx_dyn_free(req);
return result;
}
data->state.http_hd_upgrade = TRUE;
data->state.http_hd_h2_settings = TRUE;
result = curlx_dyn_addf(req,
"Upgrade: %s\r\n"
"HTTP2-Settings: %s\r\n",
NGHTTP2_CLEARTEXT_PROTO_VERSION_ID, base64);
curlx_free(base64);
k->upgr101 = UPGR101_H2;
data->conn->bits.upgrade_in_progress = TRUE;
return result;
}
static CURLcode http2_handle_stream_close(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct h2_stream_ctx *stream,
size_t *pnlen)
{
CURLcode result;
*pnlen = 0;
if(stream->reset) {
if(stream->error == NGHTTP2_REFUSED_STREAM) {
infof(data, "HTTP/2 stream %d refused by server, try again on a new "
"connection", stream->id);
connclose(cf->conn, "REFUSED_STREAM"); /* do not use this anymore */
data->state.refused_stream = TRUE;
return CURLE_RECV_ERROR; /* trigger Curl_retry_request() later */
}
else if(stream->resp_hds_complete && data->req.no_body) {
CURL_TRC_CF(data, cf, "[%d] error after response headers, but we did "
"not want a body anyway, ignore: %s (err %u)",
stream->id, nghttp2_http2_strerror(stream->error),
stream->error);
stream->close_handled = TRUE;
return CURLE_OK;
}
failf(data, "HTTP/2 stream %" PRIu32 " reset by %s (error 0x%" PRIx32
" %s)", stream->id, stream->reset_by_server ? "server" : "curl",
stream->error, nghttp2_http2_strerror(stream->error));
return stream->error ? CURLE_HTTP2_STREAM :
(data->req.bytecount ? CURLE_PARTIAL_FILE : CURLE_HTTP2);
}
else if(!stream->bodystarted) {
failf(data, "HTTP/2 stream %d was closed cleanly, but before getting "
"all response header fields, treated as error", stream->id);
return CURLE_HTTP2_STREAM;
}
if(Curl_dynhds_count(&stream->resp_trailers)) {
struct dynhds_entry *e;
struct dynbuf dbuf;
size_t i;
result = CURLE_OK;
curlx_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;
curlx_dyn_reset(&dbuf);
result = curlx_dyn_addf(&dbuf, "%.*s: %.*s\x0d\x0a",
(int)e->namelen, e->name,
(int)e->valuelen, e->value);
if(result)
break;
Curl_debug(data, CURLINFO_HEADER_IN, curlx_dyn_ptr(&dbuf),
curlx_dyn_len(&dbuf));
result = Curl_client_write(data,
CLIENTWRITE_HEADER | CLIENTWRITE_TRAILER,
curlx_dyn_ptr(&dbuf), curlx_dyn_len(&dbuf));
if(result)
break;
}
curlx_dyn_free(&dbuf);
if(result)
goto out;
}
stream->close_handled = TRUE;
result = CURLE_OK;
out:
CURL_TRC_CF(data, cf, "handle_stream_close -> %d, %zu", result, *pnlen);
return result;
}
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 cf_h2_ctx *ctx,
struct Curl_easy *data,
nghttp2_priority_spec *pri_spec)
{
struct Curl_data_priority *prio = &data->set.priority;
struct h2_stream_ctx *depstream = H2_STREAM_CTX(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 is 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 h2_stream_ctx *stream = H2_STREAM_CTX(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(ctx, 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;
}
/* Defer flushing during the connect phase so that the SETTINGS and
* other initial frames are sent together with the first request.
* Unless we are 'connect_only' where the request will never come. */
if(!cf->connected && !cf->conn->bits.connect_only)
return CURLE_OK;
return nw_out_flush(cf, data);
}
static CURLcode stream_recv(struct Curl_cfilter *cf, struct Curl_easy *data,
struct h2_stream_ctx *stream,
char *buf, size_t len, size_t *pnread)
{
struct cf_h2_ctx *ctx = cf->ctx;
CURLcode result = CURLE_AGAIN;
(void)buf;
(void)len;
*pnread = 0;
if(!stream->xfer_result)
stream->xfer_result = cf_h2_update_local_win(cf, data, stream);
if(stream->xfer_result) {
CURL_TRC_CF(data, cf, "[%d] xfer write failed", stream->id);
result = stream->xfer_result;
}
else if(stream->closed) {
CURL_TRC_CF(data, cf, "[%d] returning CLOSE", stream->id);
result = http2_handle_stream_close(cf, data, stream, pnread);
}
else if(stream->reset ||
(ctx->conn_closed && Curl_bufq_is_empty(&ctx->inbufq)) ||
(ctx->rcvd_goaway && ctx->remote_max_sid < stream->id)) {
CURL_TRC_CF(data, cf, "[%d] returning ERR", stream->id);
result = data->req.bytecount ? CURLE_PARTIAL_FILE : CURLE_HTTP2;
}
if(result && (result != CURLE_AGAIN))
CURL_TRC_CF(data, cf, "[%d] stream_recv(len=%zu) -> %d, %zu",
stream->id, len, result, *pnread);
return result;
}
static CURLcode h2_progress_ingress(struct Curl_cfilter *cf,
struct Curl_easy *data,
size_t data_max_bytes)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct h2_stream_ctx *stream;
CURLcode result = CURLE_OK;
size_t nread;
if(should_close_session(ctx)) {
CURL_TRC_CF(data, cf, "[0] ingress: session is closed");
return CURLE_HTTP2;
}
/* Process network input buffer first */
if(!Curl_bufq_is_empty(&ctx->inbufq)) {
CURL_TRC_CF(data, cf, "Process %zu bytes in connection buffer",
Curl_bufq_len(&ctx->inbufq));
result = h2_process_pending_input(cf, data);
if(result)
return result;
}
if(!data_max_bytes)
data_max_bytes = H2_CHUNK_SIZE;
/* 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(ctx, data);
if(stream && (stream->closed || !data_max_bytes)) {
/* We would like to abort here and stop processing, so that the transfer
* loop can handle the data/close here. This may leave data in
* underlying buffers that will not be consumed. */
if(!cf->next || !cf->next->cft->has_data_pending(cf->next, data))
Curl_multi_mark_dirty(data);
break;
}
else if(!stream) {
DEBUGASSERT(0);
break;
}
result = Curl_cf_recv_bufq(cf->next, data, &ctx->inbufq, 0, &nread);
if(result) {
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 %zu bytes", nread);
data_max_bytes = (data_max_bytes > nread) ? (data_max_bytes - nread) : 0;
}
result = h2_process_pending_input(cf, data);
if(result)
return result;
CURL_TRC_CF(data, cf, "[0] ingress: nw-in buffered %zu",
Curl_bufq_len(&ctx->inbufq));
}
if(ctx->conn_closed && Curl_bufq_is_empty(&ctx->inbufq)) {
connclose(cf->conn, ctx->rcvd_goaway ? "server closed with GOAWAY" :
"server closed abruptly");
}
CURL_TRC_CF(data, cf, "[0] ingress: done");
return CURLE_OK;
}
static CURLcode cf_h2_recv(struct Curl_cfilter *cf, struct Curl_easy *data,
char *buf, size_t len, size_t *pnread)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct h2_stream_ctx *stream;
CURLcode result, r2;
struct cf_call_data save;
if(!data)
return CURLE_HTTP2;
stream = H2_STREAM_CTX(ctx, data);
*pnread = 0;
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, "http/2 recv on a transfer never opened "
"or already cleared, mid=%u", data->mid);
return CURLE_HTTP2;
}
CF_DATA_SAVE(save, cf, data);
result = stream_recv(cf, data, stream, buf, len, pnread);
if(result && (result != CURLE_AGAIN))
goto out;
if(result) {
result = h2_progress_ingress(cf, data, len);
if(result)
goto out;
result = stream_recv(cf, data, stream, buf, len, pnread);
}
if(*pnread > 0) {
/* 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 */
nghttp2_session_consume(ctx->h2, stream->id, *pnread);
if(stream->closed) {
CURL_TRC_CF(data, cf, "[%d] DRAIN closed stream", stream->id);
Curl_multi_mark_dirty(data);
}
}
out:
r2 = h2_progress_egress(cf, data);
if(r2 == CURLE_AGAIN) {
/* pending data to send, need to be called again. Ideally, we
* monitor the socket for POLLOUT, but when not SENDING
* any more, we force processing of the transfer. */
if(!CURL_REQ_WANT_SEND(data))
Curl_multi_mark_dirty(data);
}
else if(r2) {
result = r2;
}
CURL_TRC_CF(data, cf, "[%d] cf_recv(len=%zu) -> %d, %zu, "
"window=%d/%d, connection %d/%d",
stream->id, len, result, *pnread,
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 result;
}
static CURLcode cf_h2_body_send(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct h2_stream_ctx *stream,
const void *buf, size_t blen, bool eos,
size_t *pnwritten)
{
struct cf_h2_ctx *ctx = cf->ctx;
CURLcode result;
*pnwritten = 0;
if(stream->closed) {
if(stream->resp_hds_complete) {
/* Server decided to close the stream after having sent us a final
* 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);
if(eos)
stream->body_eos = TRUE;
*pnwritten = blen;
return CURLE_OK;
}
/* Server closed before we got a response, this is an error */
infof(data, "stream %u closed", stream->id);
return CURLE_SEND_ERROR;
}
result = Curl_bufq_write(&stream->sendbuf, buf, blen, pnwritten);
if(result)
return result;
if(eos && (blen == *pnwritten))
stream->body_eos = TRUE;
if(eos || !Curl_bufq_is_empty(&stream->sendbuf)) {
/* resume the potentially suspended stream */
int rv = nghttp2_session_resume_data(ctx->h2, stream->id);
if(nghttp2_is_fatal(rv))
return CURLE_SEND_ERROR;
}
return CURLE_OK;
}
static CURLcode h2_submit(struct h2_stream_ctx **pstream,
struct Curl_cfilter *cf, struct Curl_easy *data,
const uint8_t *buf, size_t len,
bool eos, size_t *pnwritten)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct h2_stream_ctx *stream = NULL;
struct dynhds h2_headers;
nghttp2_nv *nva = NULL;
const void *body = NULL;
size_t nheader, bodylen;
nghttp2_data_provider data_prd;
int32_t stream_id;
nghttp2_priority_spec pri_spec;
size_t nwritten;
CURLcode result = CURLE_OK;
uint32_t initial_win_size;
*pnwritten = 0;
Curl_dynhds_init(&h2_headers, 0, DYN_HTTP_REQUEST);
result = http2_data_setup(cf, data, &stream);
if(result)
goto out;
result = Curl_h1_req_parse_read(&stream->h1, buf, len, NULL,
!data->state.http_ignorecustom ?
data->set.str[STRING_CUSTOMREQUEST] : NULL,
0, &nwritten);
if(result)
goto out;
*pnwritten = nwritten;
if(!stream->h1.done) {
/* need more data */
goto out;
}
DEBUGASSERT(stream->h1.req);
result = Curl_http_req_to_h2(&h2_headers, stream->h1.req, data);
if(result)
goto out;
/* no longer needed */
Curl_h1_req_parse_free(&stream->h1);
nva = Curl_dynhds_to_nva(&h2_headers, &nheader);
if(!nva) {
result = CURLE_OUT_OF_MEMORY;
goto out;
}
h2_pri_spec(ctx, data, &pri_spec);
if(!nghttp2_session_check_request_allowed(ctx->h2))
CURL_TRC_CF(data, cf, "send request NOT allowed (via nghttp2)");
/* Check the initial windows size of the transfer (rate-limits?) and
* send an updated settings on changes from previous value. */
initial_win_size = cf_h2_initial_win_size(data);
if(initial_win_size != ctx->initial_win_size) {
result = cf_h2_update_settings(ctx, initial_win_size);
if(result)
goto out;
}
switch(data->state.httpreq) {
case HTTPREQ_POST:
case HTTPREQ_POST_FORM:
case HTTPREQ_POST_MIME:
case HTTPREQ_PUT:
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_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);
result = CURLE_SEND_ERROR;
goto out;
}
#ifdef CURLVERBOSE
#define MAX_ACC 60000 /* <64KB to account for some overhead */
if(Curl_trc_is_verbose(data)) {
size_t acc = 0, i;
infof(data, "[HTTP/2] [%d] OPENED stream for %s",
stream_id, Curl_bufref_ptr(&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);
}
}
#endif
stream->id = stream_id;
body = (const char *)buf + *pnwritten;
bodylen = len - *pnwritten;
if(bodylen || eos) {
size_t n;
result = cf_h2_body_send(cf, data, stream, body, bodylen, eos, &n);
if(!result)
*pnwritten += n;
else if(result == CURLE_AGAIN)
result = CURLE_OK;
else {
result = CURLE_SEND_ERROR;
}
}
out:
CURL_TRC_CF(data, cf, "[%d] submit -> %d, %zu",
stream ? stream->id : -1, result, *pnwritten);
Curl_safefree(nva);
*pstream = stream;
Curl_dynhds_free(&h2_headers);
return result;
}
static CURLcode cf_h2_send(struct Curl_cfilter *cf, struct Curl_easy *data,
const uint8_t *buf, size_t len, bool eos,
size_t *pnwritten)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct h2_stream_ctx *stream = H2_STREAM_CTX(ctx, data);
struct cf_call_data save;
CURLcode result = CURLE_OK, r2;
CF_DATA_SAVE(save, cf, data);
*pnwritten = 0;
if(!stream || stream->id == -1) {
result = h2_submit(&stream, cf, data, buf, len, eos, pnwritten);
if(result)
goto out;
DEBUGASSERT(stream);
}
else if(stream->body_eos) {
/* We already wrote this, but CURLE_AGAIN-ed the call due to not
* being able to flush stream->sendbuf. Make a 0-length write
* to trigger flushing again.
* If this works, we report to have written `len` bytes. */
size_t n;
DEBUGASSERT(eos);
result = cf_h2_body_send(cf, data, stream, buf, 0, eos, &n);
CURL_TRC_CF(data, cf, "[%d] cf_body_send last CHUNK -> %d, %zu, eos=%d",
stream->id, result, n, eos);
if(result)
goto out;
*pnwritten = len;
}
else {
result = cf_h2_body_send(cf, data, stream, buf, len, eos, pnwritten);
CURL_TRC_CF(data, cf, "[%d] cf_body_send(len=%zu) -> %d, %zu, eos=%d",
stream->id, len, result, *pnwritten, eos);
}
/* Call the nghttp2 send loop and flush to write ALL buffered data,
* headers and/or request body completely out to the network */
r2 = 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) {
infof(data, "stream %u closed", stream->id);
result = CURLE_SEND_ERROR;
goto out;
}
else if(r2 && (r2 != CURLE_AGAIN)) {
result = r2;
goto out;
}
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 && stream->closed) {
result = http2_handle_stream_close(cf, data, stream, pnwritten);
}
else {
CURL_TRC_CF(data, cf, "send: nothing to do in this session");
result = CURLE_HTTP2;
}
}
out:
if(stream) {
CURL_TRC_CF(data, cf, "[%d] cf_send(len=%zu) -> %d, %zu, "
"eos=%d, h2 windows %d-%d (stream-conn), "
"buffers %zu-%zu (stream-conn)",
stream->id, len, result, *pnwritten,
stream->body_eos,
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) -> %d, %zu, "
"connection-window=%d, nw_send_buffer(%zu)",
len, result, *pnwritten,
nghttp2_session_get_remote_window_size(ctx->h2),
Curl_bufq_len(&ctx->outbufq));
}
CF_DATA_RESTORE(cf, save);
return result;
}
static CURLcode cf_h2_flush(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct h2_stream_ctx *stream = H2_STREAM_CTX(ctx, data);
struct cf_call_data save;
CURLcode result = CURLE_OK;
CF_DATA_SAVE(save, cf, data);
if(stream && !Curl_bufq_is_empty(&stream->sendbuf)) {
/* resume the potentially suspended stream */
int rv = nghttp2_session_resume_data(ctx->h2, stream->id);
if(nghttp2_is_fatal(rv)) {
result = CURLE_SEND_ERROR;
goto out;
}
}
result = h2_progress_egress(cf, data);
out:
if(stream) {
CURL_TRC_CF(data, cf, "[%d] flush -> %d, "
"h2 windows %d-%d (stream-conn), "
"buffers %zu-%zu (stream-conn)",
stream->id, result,
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, "flush -> %d, "
"connection-window=%d, nw_send_buffer(%zu)",
result, nghttp2_session_get_remote_window_size(ctx->h2),
Curl_bufq_len(&ctx->outbufq));
}
CF_DATA_RESTORE(cf, save);
return result;
}
static CURLcode cf_h2_adjust_pollset(struct Curl_cfilter *cf,
struct Curl_easy *data,
struct easy_pollset *ps)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct cf_call_data save;
curl_socket_t sock;
bool want_recv, want_send;
CURLcode result = CURLE_OK;
if(!ctx->h2)
return CURLE_OK;
sock = Curl_conn_cf_get_socket(cf, data);
Curl_pollset_check(data, ps, sock, &want_recv, &want_send);
if(want_recv || want_send) {
struct h2_stream_ctx *stream = H2_STREAM_CTX(ctx, data);
bool c_exhaust, s_exhaust;
CF_DATA_SAVE(save, cf, data);
c_exhaust = want_send && !nghttp2_session_get_remote_window_size(ctx->h2);
s_exhaust = want_send && 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_bufq_is_empty(&ctx->outbufq);
result = Curl_pollset_set(data, ps, sock, want_recv, want_send);
CF_DATA_RESTORE(cf, save);
}
else if(ctx->sent_goaway && !cf->shutdown) {
/* shutdown in progress */
CF_DATA_SAVE(save, cf, data);
want_send = nghttp2_session_want_write(ctx->h2) ||
!Curl_bufq_is_empty(&ctx->outbufq);
want_recv = nghttp2_session_want_read(ctx->h2);
result = Curl_pollset_set(data, ps, sock, want_recv, want_send);
CF_DATA_RESTORE(cf, save);
}
return result;
}
static CURLcode cf_h2_ctx_open(struct Curl_cfilter *cf,
struct Curl_easy *data)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct h2_stream_ctx *stream;
CURLcode result = CURLE_OUT_OF_MEMORY;
int rc;
nghttp2_session_callbacks *cbs = NULL;
DEBUGASSERT(!ctx->h2);
DEBUGASSERT(ctx->initialized);
rc = nghttp2_session_callbacks_new(&cbs);
if(rc) {
failf(data, "Could not 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_invalid_frame_recv_callback(cbs,
cf_h2_on_invalid_frame_recv);
#ifdef CURLVERBOSE
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);
#ifdef CURLVERBOSE
nghttp2_session_callbacks_set_error_callback(cbs, error_callback);
#endif
/* The nghttp2 session is not yet setup, do it */
rc = h2_client_new(cf, cbs);
if(rc) {
failf(data, "Could not initialize nghttp2");
goto out;
}
ctx->max_concurrent_streams = DEFAULT_MAX_CONCURRENT_STREAMS;
if(ctx->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 rclen;
size_t binlen; /* length of the binsettings data */
rclen = populate_binsettings(binsettings, data);
if(!curlx_sztouz(rclen, &binlen) || !binlen) {
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];
size_t ivlen;
ivlen = populate_settings(iv, data, ctx);
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",
ctx->via_h1_upgrade ? " (via h1 upgrade)" : "");
out:
if(cbs)
nghttp2_session_callbacks_del(cbs);
return result;
}
static CURLcode cf_h2_connect(struct Curl_cfilter *cf,
struct Curl_easy *data,
bool *done)
{
struct cf_h2_ctx *ctx = cf->ctx;
CURLcode result = CURLE_OK;
struct cf_call_data save;
bool first_time = FALSE;
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, done);
if(result || !*done)
return result;
}
*done = FALSE;
CF_DATA_SAVE(save, cf, data);
DEBUGASSERT(ctx->initialized);
if(!ctx->h2) {
result = cf_h2_ctx_open(cf, data);
if(result)
goto out;
first_time = TRUE;
}
if(!first_time) {
result = h2_progress_ingress(cf, data, 0);
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 && (result != CURLE_AGAIN))
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_close(ctx);
CF_DATA_RESTORE(cf, save);
cf->connected = FALSE;
}
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 cf_h2_shutdown(struct Curl_cfilter *cf,
struct Curl_easy *data, bool *done)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct cf_call_data save;
CURLcode result;
int rv;
if(!cf->connected || !ctx->h2 || cf->shutdown || ctx->conn_closed) {
*done = TRUE;
return CURLE_OK;
}
CF_DATA_SAVE(save, cf, data);
if(!ctx->sent_goaway) {
ctx->sent_goaway = TRUE;
rv = nghttp2_submit_goaway(ctx->h2, NGHTTP2_FLAG_NONE,
ctx->local_max_sid, 0,
(const uint8_t *)"shutdown",
sizeof("shutdown"));
if(rv) {
failf(data, "nghttp2_submit_goaway() failed: %s(%d)",
nghttp2_strerror(rv), rv);
result = CURLE_SEND_ERROR;
goto out;
}
}
/* GOAWAY submitted, process egress and ingress until nghttp2 is done. */
result = CURLE_OK;
if(nghttp2_session_want_write(ctx->h2) ||
!Curl_bufq_is_empty(&ctx->outbufq))
result = h2_progress_egress(cf, data);
if(!result && nghttp2_session_want_read(ctx->h2))
result = h2_progress_ingress(cf, data, 0);
if(result == CURLE_AGAIN)
result = CURLE_OK;
*done = (ctx->conn_closed ||
(!result && !nghttp2_session_want_write(ctx->h2) &&
!nghttp2_session_want_read(ctx->h2) &&
Curl_bufq_is_empty(&ctx->outbufq)));
out:
CF_DATA_RESTORE(cf, save);
cf->shutdown = (result || *done);
return result;
}
static CURLcode http2_data_pause(struct Curl_cfilter *cf,
struct Curl_easy *data,
bool pause)
{
struct cf_h2_ctx *ctx = cf->ctx;
struct h2_stream_ctx *stream = H2_STREAM_CTX(ctx, data);
DEBUGASSERT(data);
if(ctx && ctx->h2 && stream) {
CURLcode result;
stream->write_paused = pause;
result = cf_h2_update_local_win(cf, data, stream);
if(result)
return result;
/* 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. */
Curl_multi_mark_dirty(data);
}
CURL_TRC_CF(data, cf, "[%d] stream now %spaused", stream->id,
pause ? "" : "un");
}
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_FLUSH:
result = cf_h2_flush(cf, data);
break;
case CF_CTRL_DATA_DONE:
http2_data_done(cf, data);
break;
case CF_CTRL_CONN_INFO_UPDATE:
if(!cf->sockindex && cf->connected) {
cf->conn->httpversion_seen = 20;
Curl_conn_set_multiplex(cf->conn);
}
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 && !Curl_bufq_is_empty(&ctx->inbufq))
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;
bool alive;
struct cf_call_data save;
*input_pending = FALSE;
CF_DATA_SAVE(save, cf, data);
alive = (ctx && ctx->h2 && http2_connisalive(cf, data, input_pending));
CURL_TRC_CF(data, cf, "conn alive -> %d, input_pending=%d",
alive, *input_pending);
CF_DATA_RESTORE(cf, save);
return alive;
}
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(!ctx->h2 || !nghttp2_session_check_request_allowed(ctx->h2)) {
/* the limit is what we have in use right now */
effective_max = cf->conn->attached_xfers;
}
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;
case CF_QUERY_STREAM_ERROR: {
struct h2_stream_ctx *stream = H2_STREAM_CTX(ctx, data);
*pres1 = stream ? (int)stream->error : 0;
return CURLE_OK;
}
case CF_QUERY_NEED_FLUSH: {
struct h2_stream_ctx *stream = H2_STREAM_CTX(ctx, data);
if(!Curl_bufq_is_empty(&ctx->outbufq) ||
(stream && !Curl_bufq_is_empty(&stream->sendbuf))) {
*pres1 = TRUE;
return CURLE_OK;
}
break;
}
case CF_QUERY_HTTP_VERSION:
*pres1 = 20;
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 | CF_TYPE_HTTP,
CURL_LOG_LVL_NONE,
cf_h2_destroy,
cf_h2_connect,
cf_h2_close,
cf_h2_shutdown,
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,
bool via_h1_upgrade)
{
struct Curl_cfilter *cf = NULL;
struct cf_h2_ctx *ctx;
CURLcode result = CURLE_OUT_OF_MEMORY;
DEBUGASSERT(data->conn);
ctx = curlx_calloc(1, sizeof(*ctx));
if(!ctx)
goto out;
cf_h2_ctx_init(ctx, via_h1_upgrade);
result = Curl_cf_create(&cf, &Curl_cft_nghttp2, ctx);
if(result)
goto out;
ctx = NULL;
Curl_conn_cf_add(data, conn, sockindex, cf);
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,
bool via_h1_upgrade)
{
struct Curl_cfilter *cf_h2 = NULL;
struct cf_h2_ctx *ctx;
CURLcode result = CURLE_OUT_OF_MEMORY;
(void)data;
ctx = curlx_calloc(1, sizeof(*ctx));
if(!ctx)
goto out;
cf_h2_ctx_init(ctx, via_h1_upgrade);
result = Curl_cf_create(&cf_h2, &Curl_cft_nghttp2, ctx);
if(result)
goto out;
ctx = NULL;
Curl_conn_cf_insert_after(cf, cf_h2);
out:
if(result)
cf_h2_ctx_free(ctx);
return result;
}
bool Curl_http2_may_switch(struct Curl_easy *data)
{
if(Curl_conn_http_version(data, data->conn) < 20 &&
(data->state.http_neg.wanted & CURL_HTTP_V2x) &&
data->state.http_neg.h2_prior_knowledge) {
#ifndef CURL_DISABLE_PROXY
if(data->conn->bits.httpproxy && !data->conn->bits.tunnel_proxy) {
/* We do not support HTTP/2 proxies yet. Also it is 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 Curl_cfilter *cf;
CURLcode result;
DEBUGASSERT(Curl_conn_http_version(data, data->conn) < 20);
result = http2_cfilter_add(&cf, data, data->conn, FIRSTSOCKET, FALSE);
if(result)
return result;
CURL_TRC_CF(data, cf, "switching connection to HTTP/2");
if(cf->next) {
bool done;
return Curl_conn_cf_connect(cf, data, &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_conn_http_version(data, data->conn) < 20);
result = http2_cfilter_insert_after(cf, data, FALSE);
if(result)
return result;
cf_h2 = cf->next;
if(cf_h2->next) {
bool done;
return Curl_conn_cf_connect(cf_h2, data, &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_http_version(data, conn) < 20);
result = http2_cfilter_add(&cf, data, conn, sockindex, TRUE);
if(result)
return result;
CURL_TRC_CF(data, cf, "upgrading connection to HTTP/2");
DEBUGASSERT(cf->cft == &Curl_cft_nghttp2);
ctx = cf->ctx;
data->req.httpversion_sent = 20; /* it is an h2 request now */
data->req.header = TRUE; /* we expect the real response to come in h2 */
data->req.headerline = 0; /* restart the header line counter */
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. */
size_t copied;
result = Curl_bufq_write(&ctx->inbufq,
(const unsigned char *)mem, nread, &copied);
if(result) {
failf(data, "error on copying HTTP Upgrade response: %d", result);
return CURLE_RECV_ERROR;
}
if(copied < nread) {
failf(data, "connection buffer size could not take all data "
"from HTTP Upgrade response header: copied=%zu, datalen=%zu",
copied, nread);
return CURLE_HTTP2;
}
infof(data, "Copied HTTP/2 data in stream buffer to connection buffer"
" after upgrade: len=%zu", nread);
}
if(cf->next) {
bool done;
result = Curl_conn_cf_connect(cf, data, &done);
if(!result)
cf->cft->cntrl(cf, data, CF_CTRL_CONN_INFO_UPDATE, 0, NULL);
}
return result;
}
/* 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)
{
if(Curl_conn_http_version(data, data->conn) == 20) {
int err = Curl_conn_get_stream_error(data, data->conn, FIRSTSOCKET);
return err == NGHTTP2_HTTP_1_1_REQUIRED;
}
return FALSE;
}
void *Curl_nghttp2_malloc(size_t size, void *user_data)
{
(void)user_data;
return Curl_cmalloc(size);
}
void Curl_nghttp2_free(void *ptr, void *user_data)
{
(void)user_data;
Curl_cfree(ptr);
}
void *Curl_nghttp2_calloc(size_t nmemb, size_t size, void *user_data)
{
(void)user_data;
return Curl_ccalloc(nmemb, size);
}
void *Curl_nghttp2_realloc(void *ptr, size_t size, void *user_data)
{
(void)user_data;
return Curl_crealloc(ptr, size);
}
#else /* CURL_DISABLE_HTTP || !USE_NGHTTP2 */
/* Satisfy external references even if http2 is not compiled in. */
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 *name)
{
(void)h;
(void)name;
return NULL;
}
#endif /* !CURL_DISABLE_HTTP && USE_NGHTTP2 */