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curl/lib/http2.c

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2014, 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 http://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_NGHTTP2
#define _MPRINTF_REPLACE
#include <curl/mprintf.h>
#include <nghttp2/nghttp2.h>
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#include "urldata.h"
#include "http2.h"
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#include "http.h"
#include "sendf.h"
#include "curl_base64.h"
#include "curl_memory.h"
/* include memdebug.h last */
#include "memdebug.h"
#if (NGHTTP2_VERSION_NUM < 0x000300)
#error too old nghttp2 version, upgrade!
#endif
/*
* HTTP2 handler interface. This isn't added to the general list of protocols
* but will be used at run-time when the protocol is dynamically switched from
* HTTP to HTTP2.
*/
const struct Curl_handler Curl_handler_http2 = {
"HTTP2", /* scheme */
ZERO_NULL, /* setup_connection */
ZERO_NULL, /* do_it */
ZERO_NULL , /* done */
ZERO_NULL, /* do_more */
ZERO_NULL, /* connect_it */
ZERO_NULL, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
PORT_HTTP, /* defport */
CURLPROTO_HTTP, /* protocol */
PROTOPT_NONE /* flags */
};
/*
* Store nghttp2 version info in this buffer, Prefix with a space. Return
* total length written.
*/
int Curl_http2_ver(char *p, size_t len)
{
nghttp2_info *h2 = nghttp2_version(0);
return snprintf(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 *data, size_t length, int flags,
void *userp)
{
struct connectdata *conn = (struct connectdata *)userp;
ssize_t written;
CURLcode rc =
Curl_write(conn, conn->sock[FIRSTSOCKET], data, length, &written);
(void)h2;
(void)flags;
if(rc) {
failf(conn->data, "Failed sending HTTP2 data");
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
else if(!written)
return NGHTTP2_ERR_WOULDBLOCK;
return written;
}
static int on_frame_recv(nghttp2_session *session, const nghttp2_frame *frame,
void *userp)
{
struct connectdata *conn = (struct connectdata *)userp;
(void)session;
(void)frame;
infof(conn->data, "on_frame_recv() was called with header %x\n",
frame->hd.type);
return 0;
}
static int on_invalid_frame_recv(nghttp2_session *session,
const nghttp2_frame *frame,
nghttp2_error_code error_code, void *userp)
{
struct connectdata *conn = (struct connectdata *)userp;
(void)session;
(void)frame;
infof(conn->data, "on_invalid_frame_recv() was called, error_code = %d\n",
error_code);
return 0;
}
static int on_data_chunk_recv(nghttp2_session *session, uint8_t flags,
int32_t stream_id,
const uint8_t *data, size_t len, void *userp)
{
struct connectdata *conn = (struct connectdata *)userp;
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struct http_conn *c = &conn->proto.httpc;
(void)session;
(void)flags;
(void)data;
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infof(conn->data, "on_data_chunk_recv() "
"len = %u, stream = %x\n", len, stream_id);
if(len < c->len) {
memcpy(c->mem, data, len);
c->mem += len;
c->len -= len;
}
else {
infof(conn->data, "EEEEEEK\n");
}
return 0;
}
static int before_frame_send(nghttp2_session *session,
const nghttp2_frame *frame,
void *userp)
{
struct connectdata *conn = (struct connectdata *)userp;
(void)session;
(void)frame;
infof(conn->data, "before_frame_send() was called\n");
return 0;
}
static int on_frame_send(nghttp2_session *session,
const nghttp2_frame *frame,
void *userp)
{
struct connectdata *conn = (struct connectdata *)userp;
(void)session;
(void)frame;
infof(conn->data, "on_frame_send() was called\n");
return 0;
}
static int on_frame_not_send(nghttp2_session *session,
const nghttp2_frame *frame,
int lib_error_code, void *userp)
{
struct connectdata *conn = (struct connectdata *)userp;
(void)session;
(void)frame;
infof(conn->data, "on_frame_not_send() was called, lib_error_code = %d\n",
lib_error_code);
return 0;
}
static int on_stream_close(nghttp2_session *session, int32_t stream_id,
nghttp2_error_code error_code, void *userp)
{
struct connectdata *conn = (struct connectdata *)userp;
(void)session;
(void)stream_id;
infof(conn->data, "on_stream_close() was called, error_code = %d\n",
error_code);
return 0;
}
static int on_unknown_frame_recv(nghttp2_session *session,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen,
void *userp)
{
struct connectdata *conn = (struct connectdata *)userp;
(void)session;
(void)head;
(void)headlen;
(void)payload;
(void)payloadlen;
infof(conn->data, "on_unknown_frame_recv() was called\n");
return 0;
}
static int on_begin_headers(nghttp2_session *session,
const nghttp2_frame *frame, void *userp)
{
struct connectdata *conn = (struct connectdata *)userp;
(void)session;
(void)frame;
infof(conn->data, "on_begin_headers() was called\n");
return 0;
}
/* frame->hd.type is either NGHTTP2_HEADERS or NGHTTP2_PUSH_PROMISE */
static int on_header(nghttp2_session *session, const nghttp2_frame *frame,
const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen,
void *userp)
{
struct connectdata *conn = (struct connectdata *)userp;
struct http_conn *c = &conn->proto.httpc;
size_t hlen = namelen + valuelen + 3; /* colon + CRLF == 3 bytes */
(void)session;
(void)frame;
if(namelen && (name[0] == ':')) {
/* special case */
hlen = snprintf(c->mem, c->len, "HTTP/2.0 %s\r\n", value);
}
else if(hlen + 1 < c->len) { /* hlen + a zero byte */
/* convert to a HTTP1-style header */
memcpy(c->mem, name, namelen);
c->mem[namelen]=':';
memcpy(&c->mem[namelen+1], value, valuelen);
c->mem[namelen + valuelen + 1]='\r';
c->mem[namelen + valuelen + 2]='\n';
c->mem[namelen + valuelen + 3]=0; /* to display this easier */
}
infof(conn->data, "Got %s", c->mem);
c->mem += hlen;
c->len -= hlen;
return 0; /* 0 is successful */
}
/*
* This is all callbacks nghttp2 calls
*/
static const nghttp2_session_callbacks callbacks = {
send_callback, /* nghttp2_send_callback */
NULL, /* nghttp2_recv_callback */
on_frame_recv, /* nghttp2_on_frame_recv_callback */
on_invalid_frame_recv, /* nghttp2_on_invalid_frame_recv_callback */
on_data_chunk_recv, /* nghttp2_on_data_chunk_recv_callback */
before_frame_send, /* nghttp2_before_frame_send_callback */
on_frame_send, /* nghttp2_on_frame_send_callback */
on_frame_not_send, /* nghttp2_on_frame_not_send_callback */
on_stream_close, /* nghttp2_on_stream_close_callback */
on_unknown_frame_recv, /* nghttp2_on_unknown_frame_recv_callback */
on_begin_headers, /* nghttp2_on_begin_headers_callback */
on_header /* nghttp2_on_header_callback */
};
/*
* The HTTP2 settings we send in the Upgrade request
*/
static nghttp2_settings_entry settings[] = {
{ NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100 },
{ NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE, NGHTTP2_INITIAL_WINDOW_SIZE },
};
/*
* Initialize nghttp2 for a Curl connection
*/
CURLcode Curl_http2_init(struct connectdata *conn) {
if(!conn->proto.httpc.h2) {
/* The nghttp2 session is not yet setup, do it */
int rc = nghttp2_session_client_new(&conn->proto.httpc.h2,
&callbacks, conn);
if(rc) {
failf(conn->data, "Couldn't initialize nghttp2!");
return CURLE_OUT_OF_MEMORY; /* most likely at least */
}
}
return CURLE_OK;
}
/*
* Send a request using http2
*/
CURLcode Curl_http2_send_request(struct connectdata *conn)
{
(void)conn;
return CURLE_OK;
}
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/*
* Append headers to ask for a HTTP1.1 to HTTP2 upgrade.
*/
CURLcode Curl_http2_request_upgrade(Curl_send_buffer *req,
struct connectdata *conn)
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{
CURLcode result;
ssize_t binlen;
char *base64;
size_t blen;
struct SingleRequest *k = &conn->data->req;
uint8_t *binsettings = conn->proto.httpc.binsettings;
Curl_http2_init(conn);
/* As long as we have a fixed set of settings, we don't have to dynamically
* figure out the base64 strings since it'll always be the same. However,
* the settings will likely not be fixed every time in the future.
*/
/* this returns number of bytes it wrote */
binlen = nghttp2_pack_settings_payload(binsettings, H2_BINSETTINGS_LEN,
settings,
sizeof(settings)/sizeof(settings[0]));
if(!binlen) {
failf(conn->data, "nghttp2 unexpectedly failed on pack_settings_payload");
return CURLE_FAILED_INIT;
}
conn->proto.httpc.binlen = binlen;
result = Curl_base64_encode(conn->data, (const char *)binsettings, binlen,
&base64, &blen);
if(result)
return result;
result = Curl_add_bufferf(req,
"Connection: Upgrade, HTTP2-Settings\r\n"
"Upgrade: %s\r\n"
"HTTP2-Settings: %s\r\n",
NGHTTP2_PROTO_VERSION_ID, base64);
free(base64);
k->upgr101 = UPGR101_REQUESTED;
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return result;
}
#define H2_BUFSIZE 4096
/*
* If the read would block (EWOULDBLOCK) we return -1. Otherwise we return
* a regular CURLcode value.
*/
static ssize_t http2_recv(struct connectdata *conn, int sockindex,
char *mem, size_t len, CURLcode *err)
{
CURLcode rc;
ssize_t rv;
ssize_t nread;
char inbuf[H2_BUFSIZE];
(void)sockindex; /* we always do HTTP2 on sockindex 0 */
conn->proto.httpc.mem = mem;
conn->proto.httpc.len = len;
infof(conn->data, "http2_recv\n");
for(;;) {
rc = Curl_read_plain(conn->sock[FIRSTSOCKET], inbuf, H2_BUFSIZE, &nread);
if(rc == CURLE_AGAIN) {
*err = rc;
return -1;
}
if(rc) {
failf(conn->data, "Failed receiving HTTP2 data");
*err = CURLE_RECV_ERROR;
return 0;
}
infof(conn->data, "nread=%zd\n", nread);
if(!nread) {
*err = CURLE_RECV_ERROR;
return 0; /* TODO EOF? */
}
rv = nghttp2_session_mem_recv(conn->proto.httpc.h2,
(const uint8_t *)inbuf, nread);
if(nghttp2_is_fatal((int)rv)) {
failf(conn->data, "nghttp2_session_mem_recv() returned %d:%s\n",
rv, nghttp2_strerror((int)rv));
*err = CURLE_RECV_ERROR;
return 0;
}
if(rv < nread) {
/* Happens when NGHTTP2_ERR_PAUSE is returned from user callback */
break;
}
}
return len - conn->proto.httpc.len;
}
/* return number of received (decrypted) bytes */
static ssize_t http2_send(struct connectdata *conn, int sockindex,
const void *mem, size_t len, CURLcode *err)
{
/* TODO: proper implementation */
(void)conn;
(void)sockindex;
(void)mem;
(void)len;
(void)err;
return 0;
}
int Curl_http2_switched(struct connectdata *conn)
{
int rc;
struct http_conn *httpc = &conn->proto.httpc;
/* we are switched! */
conn->handler = &Curl_handler_http2;
conn->recv[FIRSTSOCKET] = http2_recv;
conn->send[FIRSTSOCKET] = http2_send;
infof(conn->data, "We have switched to HTTP2\n");
/* send the SETTINGS frame (again) */
rc = nghttp2_session_upgrade(httpc->h2, httpc->binsettings, httpc->binlen,
conn);
return rc;
}
#endif