/
ngtcp2.c
1794 lines (1571 loc) · 51.8 KB
/
ngtcp2.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2019, 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.haxx.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.
*
***************************************************************************/
#include "curl_setup.h"
#ifdef USE_NGTCP2
#include <ngtcp2/ngtcp2.h>
#include <ngtcp2/ngtcp2_crypto.h>
#include <nghttp3/nghttp3.h>
#include <openssl/err.h>
#include "urldata.h"
#include "sendf.h"
#include "strdup.h"
#include "rand.h"
#include "ngtcp2.h"
#include "multiif.h"
#include "strcase.h"
#include "connect.h"
#include "strerror.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
/* #define DEBUG_NGTCP2 */
#ifdef CURLDEBUG
#define DEBUG_HTTP3
#endif
#ifdef DEBUG_HTTP3
#define H3BUGF(x) x
#else
#define H3BUGF(x) do { } while(0)
#endif
/*
* This holds outgoing HTTP/3 stream data that is used by nghttp3 until acked.
* It is used as a circular buffer. Add new bytes at the end until it reaches
* the far end, then start over at index 0 again.
*/
#define H3_SEND_SIZE (20*1024)
struct h3out {
uint8_t buf[H3_SEND_SIZE];
size_t used; /* number of bytes used in the buffer */
size_t windex; /* index in the buffer where to start writing the next
data block */
};
#define QUIC_MAX_STREAMS (256*1024)
#define QUIC_MAX_DATA (1*1024*1024)
#define QUIC_IDLE_TIMEOUT 60000 /* milliseconds */
#define QUIC_CIPHERS \
"TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_" \
"POLY1305_SHA256:TLS_AES_128_CCM_SHA256"
#define QUIC_GROUPS "P-256:X25519:P-384:P-521"
static CURLcode ng_process_ingress(struct connectdata *conn,
curl_socket_t sockfd,
struct quicsocket *qs);
static CURLcode ng_flush_egress(struct connectdata *conn, int sockfd,
struct quicsocket *qs);
static int cb_h3_acked_stream_data(nghttp3_conn *conn, int64_t stream_id,
size_t datalen, void *user_data,
void *stream_user_data);
static ngtcp2_tstamp timestamp(void)
{
struct curltime ct = Curl_now();
return ct.tv_sec * NGTCP2_SECONDS + ct.tv_usec * NGTCP2_MICROSECONDS;
}
#ifdef DEBUG_NGTCP2
static void quic_printf(void *user_data, const char *fmt, ...)
{
va_list ap;
(void)user_data; /* TODO, use this to do infof() instead long-term */
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
}
#endif
static ngtcp2_crypto_level
quic_from_ossl_level(OSSL_ENCRYPTION_LEVEL ossl_level)
{
switch(ossl_level) {
case ssl_encryption_initial:
return NGTCP2_CRYPTO_LEVEL_INITIAL;
case ssl_encryption_early_data:
return NGTCP2_CRYPTO_LEVEL_EARLY;
case ssl_encryption_handshake:
return NGTCP2_CRYPTO_LEVEL_HANDSHAKE;
case ssl_encryption_application:
return NGTCP2_CRYPTO_LEVEL_APP;
default:
assert(0);
}
}
static int setup_initial_crypto_context(struct quicsocket *qs)
{
const ngtcp2_cid *dcid = ngtcp2_conn_get_dcid(qs->qconn);
if(ngtcp2_crypto_derive_and_install_initial_key(
qs->qconn, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, dcid,
NGTCP2_CRYPTO_SIDE_CLIENT) != 0)
return -1;
return 0;
}
static void quic_settings(ngtcp2_settings *s,
uint64_t stream_buffer_size)
{
ngtcp2_settings_default(s);
#ifdef DEBUG_NGTCP2
s->log_printf = quic_printf;
#else
s->log_printf = NULL;
#endif
s->initial_ts = timestamp();
s->transport_params.initial_max_stream_data_bidi_local = stream_buffer_size;
s->transport_params.initial_max_stream_data_bidi_remote = QUIC_MAX_STREAMS;
s->transport_params.initial_max_stream_data_uni = QUIC_MAX_STREAMS;
s->transport_params.initial_max_data = QUIC_MAX_DATA;
s->transport_params.initial_max_streams_bidi = 1;
s->transport_params.initial_max_streams_uni = 3;
s->transport_params.idle_timeout = QUIC_IDLE_TIMEOUT;
}
static FILE *keylog_file; /* not thread-safe */
static void keylog_callback(const SSL *ssl, const char *line)
{
(void)ssl;
fputs(line, keylog_file);
fputc('\n', keylog_file);
fflush(keylog_file);
}
static int init_ngh3_conn(struct quicsocket *qs);
static int quic_set_encryption_secrets(SSL *ssl,
OSSL_ENCRYPTION_LEVEL ossl_level,
const uint8_t *rx_secret,
const uint8_t *tx_secret,
size_t secretlen)
{
struct quicsocket *qs = (struct quicsocket *)SSL_get_app_data(ssl);
int level = quic_from_ossl_level(ossl_level);
if(ngtcp2_crypto_derive_and_install_key(
qs->qconn, ssl, NULL, NULL, NULL, NULL, NULL, NULL, level, rx_secret,
tx_secret, secretlen, NGTCP2_CRYPTO_SIDE_CLIENT) != 0)
return 0;
if(level == NGTCP2_CRYPTO_LEVEL_APP) {
if(init_ngh3_conn(qs) != CURLE_OK)
return 0;
/* malloc an area big enough for both secrets */
qs->rx_secret = malloc(secretlen * 2);
if(!qs->rx_secret)
return 0;
memcpy(qs->rx_secret, rx_secret, secretlen);
memcpy(&qs->rx_secret[secretlen], tx_secret, secretlen);
qs->tx_secret = &qs->rx_secret[secretlen];
qs->rx_secretlen = secretlen;
}
return 1;
}
static int quic_add_handshake_data(SSL *ssl, OSSL_ENCRYPTION_LEVEL ossl_level,
const uint8_t *data, size_t len)
{
struct quicsocket *qs = (struct quicsocket *)SSL_get_app_data(ssl);
struct quic_handshake *crypto_data;
ngtcp2_crypto_level level = quic_from_ossl_level(ossl_level);
int rv;
crypto_data = &qs->crypto_data[level];
if(crypto_data->buf == NULL) {
crypto_data->buf = malloc(4096);
if(!crypto_data->buf)
return 0;
crypto_data->alloclen = 4096;
}
/* TODO Just pretend that handshake does not grow more than 4KiB for
now */
assert(crypto_data->len + len <= crypto_data->alloclen);
memcpy(&crypto_data->buf[crypto_data->len], data, len);
crypto_data->len += len;
rv = ngtcp2_conn_submit_crypto_data(
qs->qconn, level, (uint8_t *)(&crypto_data->buf[crypto_data->len] - len),
len);
if(rv) {
H3BUGF(fprintf(stderr, "write_client_handshake failed\n"));
}
assert(0 == rv);
return 1;
}
static int quic_flush_flight(SSL *ssl)
{
(void)ssl;
return 1;
}
static int quic_send_alert(SSL *ssl, enum ssl_encryption_level_t level,
uint8_t alert)
{
struct quicsocket *qs = (struct quicsocket *)SSL_get_app_data(ssl);
(void)level;
qs->tls_alert = alert;
return 1;
}
static SSL_QUIC_METHOD quic_method = {quic_set_encryption_secrets,
quic_add_handshake_data,
quic_flush_flight, quic_send_alert};
static SSL_CTX *quic_ssl_ctx(struct Curl_easy *data)
{
SSL_CTX *ssl_ctx = SSL_CTX_new(TLS_method());
const char *keylog_filename;
SSL_CTX_set_min_proto_version(ssl_ctx, TLS1_3_VERSION);
SSL_CTX_set_max_proto_version(ssl_ctx, TLS1_3_VERSION);
SSL_CTX_set_default_verify_paths(ssl_ctx);
if(SSL_CTX_set_ciphersuites(ssl_ctx, QUIC_CIPHERS) != 1) {
char error_buffer[256];
ERR_error_string_n(ERR_get_error(), error_buffer, sizeof(error_buffer));
failf(data, "SSL_CTX_set_ciphersuites: %s", error_buffer);
return NULL;
}
if(SSL_CTX_set1_groups_list(ssl_ctx, QUIC_GROUPS) != 1) {
failf(data, "SSL_CTX_set1_groups_list failed");
return NULL;
}
SSL_CTX_set_quic_method(ssl_ctx, &quic_method);
keylog_filename = getenv("SSLKEYLOGFILE");
if(keylog_filename) {
keylog_file = fopen(keylog_filename, "wb");
if(keylog_file) {
SSL_CTX_set_keylog_callback(ssl_ctx, keylog_callback);
}
}
return ssl_ctx;
}
/** SSL callbacks ***/
static int quic_init_ssl(struct quicsocket *qs)
{
const uint8_t *alpn = NULL;
size_t alpnlen = 0;
/* this will need some attention when HTTPS proxy over QUIC get fixed */
const char * const hostname = qs->conn->host.name;
if(qs->ssl)
SSL_free(qs->ssl);
qs->ssl = SSL_new(qs->sslctx);
SSL_set_app_data(qs->ssl, qs);
SSL_set_connect_state(qs->ssl);
switch(qs->version) {
#ifdef NGTCP2_PROTO_VER
case NGTCP2_PROTO_VER:
alpn = (const uint8_t *)NGTCP2_ALPN_H3;
alpnlen = sizeof(NGTCP2_ALPN_H3) - 1;
break;
#endif
}
if(alpn)
SSL_set_alpn_protos(qs->ssl, alpn, (int)alpnlen);
/* set SNI */
SSL_set_tlsext_host_name(qs->ssl, hostname);
return 0;
}
static int cb_initial(ngtcp2_conn *quic, void *user_data)
{
struct quicsocket *qs = (struct quicsocket *)user_data;
if(ngtcp2_crypto_read_write_crypto_data(
quic, qs->ssl, NGTCP2_CRYPTO_LEVEL_INITIAL, NULL, 0) != 0)
return NGTCP2_ERR_CALLBACK_FAILURE;
return 0;
}
static int
cb_recv_crypto_data(ngtcp2_conn *tconn, ngtcp2_crypto_level crypto_level,
uint64_t offset,
const uint8_t *data, size_t datalen,
void *user_data)
{
struct quicsocket *qs = (struct quicsocket *)user_data;
(void)offset;
if(ngtcp2_crypto_read_write_crypto_data(tconn, qs->ssl, crypto_level, data,
datalen) != 0)
return NGTCP2_ERR_CRYPTO;
return 0;
}
static int cb_handshake_completed(ngtcp2_conn *tconn, void *user_data)
{
struct quicsocket *qs = (struct quicsocket *)user_data;
(void)tconn;
infof(qs->conn->data, "QUIC handshake is completed\n");
return 0;
}
static void extend_stream_window(ngtcp2_conn *tconn,
struct HTTP *stream)
{
size_t thismuch = stream->unacked_window;
ngtcp2_conn_extend_max_stream_offset(tconn, stream->stream3_id, thismuch);
ngtcp2_conn_extend_max_offset(tconn, thismuch);
stream->unacked_window = 0;
}
static int cb_recv_stream_data(ngtcp2_conn *tconn, int64_t stream_id,
int fin, uint64_t offset,
const uint8_t *buf, size_t buflen,
void *user_data, void *stream_user_data)
{
struct quicsocket *qs = (struct quicsocket *)user_data;
ssize_t nconsumed;
(void)offset;
(void)stream_user_data;
nconsumed =
nghttp3_conn_read_stream(qs->h3conn, stream_id, buf, buflen, fin);
if(nconsumed < 0) {
failf(qs->conn->data, "nghttp3_conn_read_stream returned error: %s\n",
nghttp3_strerror((int)nconsumed));
return NGTCP2_ERR_CALLBACK_FAILURE;
}
/* number of bytes inside buflen which consists of framing overhead
* including QPACK HEADERS. In other words, it does not consume payload of
* DATA frame. */
ngtcp2_conn_extend_max_stream_offset(tconn, stream_id, nconsumed);
ngtcp2_conn_extend_max_offset(tconn, nconsumed);
return 0;
}
static int
cb_acked_stream_data_offset(ngtcp2_conn *tconn, int64_t stream_id,
uint64_t offset, size_t datalen, void *user_data,
void *stream_user_data)
{
struct quicsocket *qs = (struct quicsocket *)user_data;
int rv;
(void)stream_id;
(void)tconn;
(void)offset;
(void)datalen;
(void)stream_user_data;
rv = nghttp3_conn_add_ack_offset(qs->h3conn, stream_id, datalen);
if(rv != 0) {
failf(qs->conn->data, "nghttp3_conn_add_ack_offset returned error: %s\n",
nghttp3_strerror(rv));
return NGTCP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
static int cb_stream_close(ngtcp2_conn *tconn, int64_t stream_id,
uint64_t app_error_code,
void *user_data, void *stream_user_data)
{
struct quicsocket *qs = (struct quicsocket *)user_data;
int rv;
(void)tconn;
(void)stream_user_data;
/* stream is closed... */
rv = nghttp3_conn_close_stream(qs->h3conn, stream_id,
app_error_code);
if(rv != 0) {
failf(qs->conn->data, "nghttp3_conn_close_stream returned error: %s\n",
nghttp3_strerror(rv));
return NGTCP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
static int cb_stream_reset(ngtcp2_conn *tconn, int64_t stream_id,
uint64_t final_size, uint64_t app_error_code,
void *user_data, void *stream_user_data)
{
struct quicsocket *qs = (struct quicsocket *)user_data;
int rv;
(void)tconn;
(void)final_size;
(void)app_error_code;
(void)stream_user_data;
rv = nghttp3_conn_reset_stream(qs->h3conn, stream_id);
if(rv != 0) {
failf(qs->conn->data, "nghttp3_conn_reset_stream returned error: %s\n",
nghttp3_strerror(rv));
return NGTCP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
static int cb_recv_retry(ngtcp2_conn *tconn, const ngtcp2_pkt_hd *hd,
const ngtcp2_pkt_retry *retry, void *user_data)
{
/* Re-generate handshake secrets here because connection ID might change. */
struct quicsocket *qs = (struct quicsocket *)user_data;
(void)tconn;
(void)hd;
(void)retry;
setup_initial_crypto_context(qs);
return 0;
}
static int cb_extend_max_local_streams_bidi(ngtcp2_conn *tconn,
uint64_t max_streams,
void *user_data)
{
(void)tconn;
(void)max_streams;
(void)user_data;
return 0;
}
static int cb_extend_max_stream_data(ngtcp2_conn *tconn, int64_t stream_id,
uint64_t max_data, void *user_data,
void *stream_user_data)
{
struct quicsocket *qs = (struct quicsocket *)user_data;
int rv;
(void)tconn;
(void)max_data;
(void)stream_user_data;
rv = nghttp3_conn_unblock_stream(qs->h3conn, stream_id);
if(rv != 0) {
failf(qs->conn->data, "nghttp3_conn_unblock_stream returned error: %s\n",
nghttp3_strerror(rv));
return NGTCP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
static int cb_get_new_connection_id(ngtcp2_conn *tconn, ngtcp2_cid *cid,
uint8_t *token, size_t cidlen,
void *user_data)
{
struct quicsocket *qs = (struct quicsocket *)user_data;
CURLcode result;
(void)tconn;
result = Curl_rand(qs->conn->data, cid->data, cidlen);
if(result)
return NGTCP2_ERR_CALLBACK_FAILURE;
cid->datalen = cidlen;
result = Curl_rand(qs->conn->data, token, NGTCP2_STATELESS_RESET_TOKENLEN);
if(result)
return NGTCP2_ERR_CALLBACK_FAILURE;
return 0;
}
static int cb_update_key(ngtcp2_conn *tconn, uint8_t *rx_key,
uint8_t *rx_iv, uint8_t *tx_key,
uint8_t *tx_iv, void *user_data)
{
struct quicsocket *qs = (struct quicsocket *)user_data;
uint8_t rx_secret[64];
uint8_t tx_secret[64];
if(ngtcp2_crypto_update_key(tconn, rx_secret, tx_secret,
rx_key, rx_iv, tx_key, tx_iv, qs->rx_secret,
qs->tx_secret, qs->rx_secretlen) != 0)
return NGTCP2_ERR_CALLBACK_FAILURE;
/* store the updated secrets */
memcpy(qs->rx_secret, rx_secret, qs->rx_secretlen);
memcpy(qs->tx_secret, tx_secret, qs->rx_secretlen);
return 0;
}
static ngtcp2_conn_callbacks ng_callbacks = {
cb_initial,
NULL, /* recv_client_initial */
cb_recv_crypto_data,
cb_handshake_completed,
NULL, /* recv_version_negotiation */
ngtcp2_crypto_encrypt_cb,
ngtcp2_crypto_decrypt_cb,
ngtcp2_crypto_hp_mask_cb,
cb_recv_stream_data,
NULL, /* acked_crypto_offset */
cb_acked_stream_data_offset,
NULL, /* stream_open */
cb_stream_close,
NULL, /* recv_stateless_reset */
cb_recv_retry,
cb_extend_max_local_streams_bidi,
NULL, /* extend_max_local_streams_uni */
NULL, /* rand */
cb_get_new_connection_id,
NULL, /* remove_connection_id */
cb_update_key, /* update_key */
NULL, /* path_validation */
NULL, /* select_preferred_addr */
cb_stream_reset,
NULL, /* extend_max_remote_streams_bidi */
NULL, /* extend_max_remote_streams_uni */
cb_extend_max_stream_data,
};
/*
* Might be called twice for happy eyeballs.
*/
CURLcode Curl_quic_connect(struct connectdata *conn,
curl_socket_t sockfd,
int sockindex,
const struct sockaddr *addr,
socklen_t addrlen)
{
int rc;
int rv;
CURLcode result;
ngtcp2_path path; /* TODO: this must be initialized properly */
struct Curl_easy *data = conn->data;
struct quicsocket *qs = &conn->hequic[sockindex];
char ipbuf[40];
long port;
uint8_t paramsbuf[64];
ngtcp2_transport_params params;
ssize_t nwrite;
qs->conn = conn;
/* extract the used address as a string */
if(!Curl_addr2string((struct sockaddr*)addr, addrlen, ipbuf, &port)) {
char buffer[STRERROR_LEN];
failf(data, "ssrem inet_ntop() failed with errno %d: %s",
SOCKERRNO, Curl_strerror(SOCKERRNO, buffer, sizeof(buffer)));
return CURLE_BAD_FUNCTION_ARGUMENT;
}
infof(data, "Connect socket %d over QUIC to %s:%ld\n",
sockfd, ipbuf, port);
qs->version = NGTCP2_PROTO_VER;
qs->sslctx = quic_ssl_ctx(data);
if(!qs->sslctx)
return CURLE_FAILED_INIT; /* TODO: better return code */
if(quic_init_ssl(qs))
return CURLE_FAILED_INIT; /* TODO: better return code */
qs->dcid.datalen = NGTCP2_MAX_CIDLEN;
result = Curl_rand(data, qs->dcid.data, NGTCP2_MAX_CIDLEN);
if(result)
return result;
qs->scid.datalen = NGTCP2_MAX_CIDLEN;
result = Curl_rand(data, qs->scid.data, NGTCP2_MAX_CIDLEN);
if(result)
return result;
quic_settings(&qs->settings, data->set.buffer_size);
qs->local_addrlen = sizeof(qs->local_addr);
rv = getsockname(sockfd, (struct sockaddr *)&qs->local_addr,
&qs->local_addrlen);
if(rv == -1)
return CURLE_FAILED_INIT;
ngtcp2_addr_init(&path.local, (uint8_t *)&qs->local_addr, qs->local_addrlen,
NULL);
ngtcp2_addr_init(&path.remote, (uint8_t*)addr, addrlen, NULL);
#ifdef NGTCP2_PROTO_VER
#define QUICVER NGTCP2_PROTO_VER
#else
#error "unsupported ngtcp2 version"
#endif
rc = ngtcp2_conn_client_new(&qs->qconn, &qs->dcid, &qs->scid, &path, QUICVER,
&ng_callbacks, &qs->settings, NULL, qs);
if(rc)
return CURLE_FAILED_INIT; /* TODO: create a QUIC error code */
ngtcp2_conn_get_local_transport_params(qs->qconn, ¶ms);
nwrite = ngtcp2_encode_transport_params(
paramsbuf, sizeof(paramsbuf), NGTCP2_TRANSPORT_PARAMS_TYPE_CLIENT_HELLO,
¶ms);
if(nwrite < 0) {
failf(data, "ngtcp2_encode_transport_params: %s\n",
ngtcp2_strerror((int)nwrite));
return CURLE_FAILED_INIT;
}
if(!SSL_set_quic_transport_params(qs->ssl, paramsbuf, nwrite))
return CURLE_FAILED_INIT;
rc = setup_initial_crypto_context(qs);
if(rc)
return CURLE_FAILED_INIT; /* TODO: better return code */
return CURLE_OK;
}
/*
* Store ngtp2 version info in this buffer, Prefix with a space. Return total
* length written.
*/
int Curl_quic_ver(char *p, size_t len)
{
ngtcp2_info *ng2 = ngtcp2_version(0);
nghttp3_info *ht3 = nghttp3_version(0);
return msnprintf(p, len, " ngtcp2/%s nghttp3/%s",
ng2->version_str, ht3->version_str);
}
static int ng_getsock(struct connectdata *conn, curl_socket_t *socks)
{
struct SingleRequest *k = &conn->data->req;
int bitmap = GETSOCK_BLANK;
socks[0] = conn->sock[FIRSTSOCKET];
/* in a HTTP/2 connection we can basically always get a frame so we should
always be ready for one */
bitmap |= GETSOCK_READSOCK(FIRSTSOCKET);
/* we're still uploading or the HTTP/2 layer wants to send data */
if((k->keepon & (KEEP_SEND|KEEP_SEND_PAUSE)) == KEEP_SEND)
bitmap |= GETSOCK_WRITESOCK(FIRSTSOCKET);
return bitmap;
}
static int ng_perform_getsock(const struct connectdata *conn,
curl_socket_t *socks)
{
return ng_getsock((struct connectdata *)conn, socks);
}
static CURLcode ng_disconnect(struct connectdata *conn,
bool dead_connection)
{
int i;
struct quicsocket *qs = &conn->hequic[0];
(void)dead_connection;
free(qs->rx_secret);
if(qs->ssl)
SSL_free(qs->ssl);
for(i = 0; i < 3; i++)
free(qs->crypto_data[i].buf);
nghttp3_conn_del(qs->h3conn);
ngtcp2_conn_del(qs->qconn);
SSL_CTX_free(qs->sslctx);
return CURLE_OK;
}
static unsigned int ng_conncheck(struct connectdata *conn,
unsigned int checks_to_perform)
{
(void)conn;
(void)checks_to_perform;
return CONNRESULT_NONE;
}
static const struct Curl_handler Curl_handler_http3 = {
"HTTPS", /* scheme */
ZERO_NULL, /* setup_connection */
Curl_http, /* do_it */
Curl_http_done, /* done */
ZERO_NULL, /* do_more */
ZERO_NULL, /* connect_it */
ZERO_NULL, /* connecting */
ZERO_NULL, /* doing */
ng_getsock, /* proto_getsock */
ng_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ng_perform_getsock, /* perform_getsock */
ng_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
ng_conncheck, /* connection_check */
PORT_HTTP, /* defport */
CURLPROTO_HTTPS, /* protocol */
PROTOPT_SSL | PROTOPT_STREAM /* flags */
};
static int cb_h3_stream_close(nghttp3_conn *conn, int64_t stream_id,
uint64_t app_error_code, void *user_data,
void *stream_user_data)
{
struct Curl_easy *data = stream_user_data;
struct HTTP *stream = data->req.protop;
(void)conn;
(void)stream_id;
(void)app_error_code;
(void)user_data;
H3BUGF(infof(data, "cb_h3_stream_close CALLED\n"));
stream->closed = TRUE;
Curl_expire(data, 0, EXPIRE_QUIC);
/* make sure that ngh3_stream_recv is called again to complete the transfer
even if there are no more packets to be received from the server. */
data->state.drain = 1;
return 0;
}
/* Minimum size of the overflow buffer */
#define OVERFLOWSIZE 1024
/*
* allocate_overflow() ensures that there is room for incoming data in the
* overflow buffer, growing it to accommodate the new data if necessary. We
* may need to use the overflow buffer because we can't precisely limit the
* amount of HTTP/3 header data we receive using QUIC flow control mechanisms.
*/
static CURLcode allocate_overflow(struct Curl_easy *data,
struct HTTP *stream,
size_t length)
{
size_t maxleft;
size_t newsize;
/* length can be arbitrarily large, so take care not to overflow newsize */
maxleft = CURL_MAX_READ_SIZE - stream->overflow_buflen;
if(length > maxleft) {
/* The reason to have a max limit for this is to avoid the risk of a bad
server feeding libcurl with a highly compressed list of headers that
will cause our overflow buffer to grow too large */
failf(data, "Rejected %zu bytes of overflow data (max is %d)!",
stream->overflow_buflen + length, CURL_MAX_READ_SIZE);
return CURLE_OUT_OF_MEMORY;
}
newsize = stream->overflow_buflen + length;
if(newsize > stream->overflow_bufsize) {
/* We enlarge the overflow buffer as it is too small */
char *newbuff;
newsize = CURLMAX(newsize * 3 / 2, stream->overflow_bufsize*2);
newsize = CURLMIN(CURLMAX(OVERFLOWSIZE, newsize), CURL_MAX_READ_SIZE);
newbuff = realloc(stream->overflow_buf, newsize);
if(!newbuff) {
failf(data, "Failed to alloc memory for overflow buffer!");
return CURLE_OUT_OF_MEMORY;
}
stream->overflow_buf = newbuff;
stream->overflow_bufsize = newsize;
infof(data, "Grew HTTP/3 overflow buffer to %zu bytes\n", newsize);
}
return CURLE_OK;
}
/*
* write_data() copies data to the stream's receive buffer. If not enough
* space is available in the receive buffer, it copies the rest to the
* stream's overflow buffer.
*/
static CURLcode write_data(struct Curl_easy *data,
struct HTTP *stream,
const void *mem, size_t memlen)
{
CURLcode result = CURLE_OK;
const char *buf = mem;
size_t ncopy = memlen;
/* copy as much as possible to the receive buffer */
if(stream->len) {
size_t len = CURLMIN(ncopy, stream->len);
#if 0 /* extra debugging of incoming h3 data */
fprintf(stderr, "!! Copies %zd bytes to %p (total %zd)\n",
len, stream->mem, stream->memlen);
#endif
memcpy(stream->mem, buf, len);
stream->len -= len;
stream->memlen += len;
stream->mem += len;
buf += len;
ncopy -= len;
}
/* copy the rest to the overflow buffer */
if(ncopy) {
result = allocate_overflow(data, stream, ncopy);
if(result) {
return result;
}
#if 0 /* extra debugging of incoming h3 data */
fprintf(stderr, "!! Copies %zd overflow bytes to %p (total %zd)\n",
ncopy, stream->overflow_buf, stream->overflow_buflen);
#endif
memcpy(stream->overflow_buf + stream->overflow_buflen, buf, ncopy);
stream->overflow_buflen += ncopy;
}
#if 0 /* extra debugging of incoming h3 data */
{
size_t i;
for(i = 0; i < memlen; i++) {
fprintf(stderr, "!! data[%d]: %02x '%c'\n", i, buf[i], buf[i]);
}
}
#endif
return result;
}
static int cb_h3_recv_data(nghttp3_conn *conn, int64_t stream_id,
const uint8_t *buf, size_t buflen,
void *user_data, void *stream_user_data)
{
struct Curl_easy *data = stream_user_data;
struct HTTP *stream = data->req.protop;
CURLcode result = CURLE_OK;
(void)conn;
result = write_data(data, stream, buf, buflen);
if(result) {
return -1;
}
stream->unacked_window += buflen;
(void)stream_id;
(void)user_data;
return 0;
}
static int cb_h3_deferred_consume(nghttp3_conn *conn, int64_t stream_id,
size_t consumed, void *user_data,
void *stream_user_data)
{
struct quicsocket *qs = user_data;
(void)conn;
(void)stream_user_data;
(void)stream_id;
ngtcp2_conn_extend_max_stream_offset(qs->qconn, stream_id, consumed);
ngtcp2_conn_extend_max_offset(qs->qconn, consumed);
return 0;
}
/* Decode HTTP status code. Returns -1 if no valid status code was
decoded. (duplicate from http2.c) */
static int decode_status_code(const uint8_t *value, size_t len)
{
int i;
int res;
if(len != 3) {
return -1;
}
res = 0;
for(i = 0; i < 3; ++i) {
char c = value[i];
if(c < '0' || c > '9') {
return -1;
}
res *= 10;
res += c - '0';
}
return res;
}
static int cb_h3_end_headers(nghttp3_conn *conn, int64_t stream_id,
void *user_data, void *stream_user_data)
{
struct Curl_easy *data = stream_user_data;
struct HTTP *stream = data->req.protop;
CURLcode result = CURLE_OK;
(void)conn;
(void)stream_id;
(void)user_data;
/* add a CRLF only if we've received some headers */
if(stream->firstheader) {
result = write_data(data, stream, "\r\n", 2);
if(result) {
return -1;
}
}
return 0;
}
static int cb_h3_recv_header(nghttp3_conn *conn, int64_t stream_id,
int32_t token, nghttp3_rcbuf *name,
nghttp3_rcbuf *value, uint8_t flags,
void *user_data, void *stream_user_data)
{
nghttp3_vec h3name = nghttp3_rcbuf_get_buf(name);
nghttp3_vec h3val = nghttp3_rcbuf_get_buf(value);
struct Curl_easy *data = stream_user_data;
struct HTTP *stream = data->req.protop;
CURLcode result = CURLE_OK;
(void)conn;
(void)stream_id;
(void)token;
(void)flags;
(void)user_data;
if(h3name.len == sizeof(":status") - 1 &&
!memcmp(":status", h3name.base, h3name.len)) {
char line[14]; /* status line is always 13 characters long */
size_t ncopy;
int status = decode_status_code(h3val.base, h3val.len);
DEBUGASSERT(status != -1);
ncopy = msnprintf(line, sizeof(line), "HTTP/3 %03d \r\n", status);
result = write_data(data, stream, line, ncopy);
if(result) {
return -1;
}
}
else {
/* store as a HTTP1-style header */
result = write_data(data, stream, h3name.base, h3name.len);
if(result) {
return -1;
}
result = write_data(data, stream, ": ", 2);
if(result) {
return -1;
}
result = write_data(data, stream, h3val.base, h3val.len);
if(result) {
return -1;
}
result = write_data(data, stream, "\r\n", 2);
if(result) {
return -1;
}
}
stream->firstheader = TRUE;
return 0;
}
static int cb_h3_send_stop_sending(nghttp3_conn *conn, int64_t stream_id,
uint64_t app_error_code,
void *user_data,
void *stream_user_data)
{
(void)conn;
(void)stream_id;
(void)app_error_code;
(void)user_data;
(void)stream_user_data;
return 0;
}