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http2.c
2817 lines (2494 loc) · 86.3 KB
/
http2.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#ifdef USE_NGHTTP2
#include <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 "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 size_t populate_binsettings(uint8_t *binsettings,
struct Curl_easy *data)
{
nghttp2_settings_entry iv[H2_SETTINGS_IV_LEN];
int ivlen;
ivlen = populate_settings(iv, data);
/* this returns number of bytes it wrote */
return nghttp2_pack_settings_payload(binsettings, H2_BINSETTINGS_LEN,
iv, ivlen);
}
struct cf_h2_ctx {
nghttp2_session *h2;
uint32_t max_concurrent_streams;
/* The easy handle used in the current filter call, cleared at return */
struct cf_call_data call_data;
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 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 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.dselect_bits != bits) {
CURL_TRC_CF(data, cf, "[%d] DRAIN dselect_bits=%x",
stream->id, bits);
data->state.dselect_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_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) {
if(!stream->closed && stream->id > 0) {
/* RST_STREAM */
CURL_TRC_CF(data, cf, "[%d] premature DATA_DONE, RST stream",
stream->id);
if(!nghttp2_submit_rst_stream(ctx->h2, NGHTTP2_FLAG_NONE,
stream->id, NGHTTP2_STREAM_CLOSED))
(void)nghttp2_session_send(ctx->h2);
}
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 */
(void)h2_progress_egress(cf, data);
}
/* -1 means unassigned and 0 means cleared */
if(nghttp2_session_get_stream_user_data(ctx->h2, stream->id)) {
int rv = nghttp2_session_set_stream_user_data(ctx->h2,
stream->id, 0);
if(rv) {
infof(data, "http/2: failed to clear user_data for stream %u",
stream->id);
DEBUGASSERT(0);
}
}
}
Curl_bufq_free(&stream->sendbuf);
Curl_bufq_free(&stream->recvbuf);
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);
ssize_t nwritten;
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;
}
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];
size_t binlen; /* length of the binsettings data */
binlen = populate_binsettings(binsettings, data);
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);