osd-contiki/core/net/ipv6/websocket-http-client.c

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2016-10-31 22:08:27 +01:00
/*
* Copyright (c) 2014, Thingsquare, http://www.thingsquare.com/.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "websocket-http-client.h"
#include "net/ip/uiplib.h"
#include "net/ip/resolv.h"
#include "ip64-addr.h"
#include <stdio.h>
#include <string.h>
#define DEBUG DEBUG_NONE
#include "net/ip/uip-debug.h"
enum {
STATE_WAITING_FOR_HEADER,
STATE_WAITING_FOR_CONNECTED,
STATE_STEADY_STATE,
};
/*---------------------------------------------------------------------------*/
static void
send_get(struct websocket_http_client_state *s)
{
struct tcp_socket *tcps;
tcps = &s->s;
tcp_socket_send_str(tcps, "GET ");
tcp_socket_send_str(tcps, s->file);
tcp_socket_send_str(tcps, " HTTP/1.1\r\n");
tcp_socket_send_str(tcps, "Host: ");
tcp_socket_send_str(tcps, s->host);
tcp_socket_send_str(tcps, "\r\n");
if(strlen(s->header) > 0) {
tcp_socket_send_str(tcps, s->header);
}
tcp_socket_send_str(tcps,
"Connection: Upgrade\r\n"
"Upgrade: websocket\r\n"
"Sec-WebSocket-Key: x3JJHMbDL1EzLkh9GBhXDw==\r\n"
"Sec-WebSocket-Version: 13\r\n"
"Sec-WebSocket-Protocol:");
tcp_socket_send_str(tcps, s->subprotocol);
tcp_socket_send_str(tcps, "\r\n");
tcp_socket_send_str(tcps, "\r\n");
PRINTF("websocket-http-client: send_get(): output buffer left %d\n", tcp_socket_max_sendlen(tcps));
}
/*---------------------------------------------------------------------------*/
static void
send_connect(struct websocket_http_client_state *s)
{
struct tcp_socket *tcps;
char buf[20];
tcps = &s->s;
tcp_socket_send_str(tcps, "CONNECT ");
tcp_socket_send_str(tcps, s->host);
tcp_socket_send_str(tcps, ":");
sprintf(buf, "%d", s->port);
tcp_socket_send_str(tcps, buf);
tcp_socket_send_str(tcps, " HTTP/1.1\r\n");
tcp_socket_send_str(tcps, "Host: ");
tcp_socket_send_str(tcps, s->host);
tcp_socket_send_str(tcps, "\r\n");
tcp_socket_send_str(tcps, "Proxy-Connection: Keep-Alive\r\n\r\n");
}
/*---------------------------------------------------------------------------*/
static void
event(struct tcp_socket *tcps, void *ptr,
tcp_socket_event_t e)
{
struct websocket_http_client_state *s = ptr;
if(e == TCP_SOCKET_CONNECTED) {
if(s->proxy_port != 0) {
send_connect(s);
} else {
send_get(s);
}
} else if(e == TCP_SOCKET_CLOSED) {
websocket_http_client_closed(s);
} else if(e == TCP_SOCKET_TIMEDOUT) {
websocket_http_client_timedout(s);
} else if(e == TCP_SOCKET_ABORTED) {
websocket_http_client_aborted(s);
} else if(e == TCP_SOCKET_DATA_SENT) {
}
}
/*---------------------------------------------------------------------------*/
static int
parse_header_byte(struct websocket_http_client_state *s,
uint8_t b)
{
static const char *endmarker = "\r\n\r\n";
PT_BEGIN(&s->parse_header_pt);
/* Skip the first part of the HTTP response */
while(b != ' ') {
PT_YIELD(&s->parse_header_pt);
}
/* Skip the space that follow the first part */
PT_YIELD(&s->parse_header_pt);
/* Read the first three bytes that consistute the HTTP status code. */
s->http_status = (b - '0');
PT_YIELD(&s->parse_header_pt);
s->http_status = s->http_status * 10 + (b - '0');
PT_YIELD(&s->parse_header_pt);
s->http_status = s->http_status * 10 + (b - '0');
if((s->proxy_port != 0 && !(s->http_status == 200 || s->http_status == 101)) ||
(s->proxy_port == 0 && s->http_status != 101)) {
/* This is a websocket request, so the server should have answered
with a 101 Switching protocols response. */
PRINTF("Websocket HTTP client didn't get the 101 status code (got %d), closing connection\n",
s->http_status);
websocket_http_client_close(s);
while(1) {
PT_YIELD(&s->parse_header_pt);
}
}
/* Keep eating header bytes until we reach the end of it. The end is
indicated by the string "\r\n\r\n". We don't actually look at any
of the headers.
The s->i variable contains the number of consecutive bytes
matched. If we match the total length of the string, we stop.
*/
s->i = 0;
do {
PT_YIELD(&s->parse_header_pt);
if(b == (uint8_t)endmarker[s->i]) {
s->i++;
} else {
s->i = 0;
}
} while(s->i < strlen(endmarker));
if(s->proxy_port != 0 && s->state == STATE_WAITING_FOR_HEADER) {
send_get(s);
s->state = STATE_WAITING_FOR_CONNECTED;
} else {
s->state = STATE_STEADY_STATE;
websocket_http_client_connected(s);
}
PT_END(&s->parse_header_pt);
}
/*---------------------------------------------------------------------------*/
static int
input(struct tcp_socket *tcps, void *ptr,
const uint8_t *inputptr, int inputdatalen)
{
struct websocket_http_client_state *s = ptr;
if(s->state == STATE_WAITING_FOR_HEADER ||
s->state == STATE_WAITING_FOR_CONNECTED) {
int i;
for(i = 0; i < inputdatalen; i++) {
parse_header_byte(s, inputptr[i]);
if(s->state == STATE_STEADY_STATE) {
i++;
break;
}
}
if(i < inputdatalen && s->state == STATE_STEADY_STATE) {
websocket_http_client_datahandler(s, &inputptr[i], inputdatalen - i);
}
} else {
websocket_http_client_datahandler(s, inputptr, inputdatalen);
}
return 0; /* all data consumed */
}
/*---------------------------------------------------------------------------*/
int
websocket_http_client_register(struct websocket_http_client_state *s,
const char *host,
uint16_t port,
const char *file,
const char *subprotocol,
const char *header)
{
if(host == NULL) {
return -1;
}
strncpy(s->host, host, sizeof(s->host));
if(file == NULL) {
return -1;
}
strncpy(s->file, file, sizeof(s->file));
if(subprotocol == NULL) {
return -1;
}
strncpy(s->subprotocol, subprotocol, sizeof(s->subprotocol));
if(header == NULL) {
strncpy(s->header, "", sizeof(s->header));
} else {
strncpy(s->header, header, sizeof(s->header));
}
if(port == 0) {
s->port = 80;
} else {
s->port = port;
}
return 1;
}
/*---------------------------------------------------------------------------*/
int
websocket_http_client_get(struct websocket_http_client_state *s)
{
uip_ip4addr_t ip4addr;
uip_ip6addr_t ip6addr;
uip_ip6addr_t *addr;
uint16_t port;
PRINTF("websocket_http_client_get: connecting to %s with file %s subprotocol %s header %s\n",
s->host, s->file, s->subprotocol, s->header);
s->state = STATE_WAITING_FOR_HEADER;
if(tcp_socket_register(&s->s, s,
s->inputbuf, sizeof(s->inputbuf),
s->outputbuf, sizeof(s->outputbuf),
input, event) < 0) {
return -1;
}
port = s->port;
if(s->proxy_port != 0) {
/* The proxy address should be an IPv6 address. */
uip_ipaddr_copy(&ip6addr, &s->proxy_addr);
port = s->proxy_port;
} else if(uiplib_ip6addrconv(s->host, &ip6addr) == 0) {
/* First check if the host is an IP address. */
if(uiplib_ip4addrconv(s->host, &ip4addr) != 0) {
ip64_addr_4to6(&ip4addr, &ip6addr);
} else {
/* Try to lookup the hostname. If it fails, we initiate a hostname
lookup. */
if(resolv_lookup(s->host, &addr) != RESOLV_STATUS_CACHED) {
return -1;
}
return tcp_socket_connect(&s->s, addr, s->port);
}
}
return tcp_socket_connect(&s->s, &ip6addr, port);
}
/*---------------------------------------------------------------------------*/
int
websocket_http_client_send(struct websocket_http_client_state *s,
const uint8_t *data,
uint16_t datalen)
{
if(s->state == STATE_STEADY_STATE) {
return tcp_socket_send(&s->s, data, datalen);
}
return -1;
}
/*---------------------------------------------------------------------------*/
int
websocket_http_client_sendbuflen(struct websocket_http_client_state *s)
{
return tcp_socket_max_sendlen(&s->s);
}
/*---------------------------------------------------------------------------*/
void
websocket_http_client_close(struct websocket_http_client_state *s)
{
tcp_socket_close(&s->s);
}
/*---------------------------------------------------------------------------*/
const char *
websocket_http_client_hostname(struct websocket_http_client_state *s)
{
return s->host;
}
/*---------------------------------------------------------------------------*/
void
websocket_http_client_init(struct websocket_http_client_state *s)
{
uip_create_unspecified(&s->proxy_addr);
s->proxy_port = 0;
}
/*---------------------------------------------------------------------------*/
void
websocket_http_client_set_proxy(struct websocket_http_client_state *s,
const uip_ipaddr_t *addr, uint16_t port)
{
uip_ipaddr_copy(&s->proxy_addr, addr);
s->proxy_port = port;
}
/*---------------------------------------------------------------------------*/
int
websocket_http_client_queuelen(struct websocket_http_client_state *s)
{
return tcp_socket_queuelen(&s->s);
}
/*---------------------------------------------------------------------------*/