285 lines
8.2 KiB
C
285 lines
8.2 KiB
C
/*
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* Copyright (c) 2009, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: twitter.c,v 1.2 2009/05/11 17:31:13 adamdunkels Exp $
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*/
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/**
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* \file
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* Contiki interface to posting Twitter messages
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "contiki.h"
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#include "contiki-net.h"
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#include "shell.h"
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#include "twitter.h"
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#include <stdio.h>
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#include <string.h>
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#define MAX_USERNAME_PASSWORD 32
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#define MAX_MESSAGE 160
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#define MAX_LENGTH 10
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struct twitter_state {
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unsigned char timer;
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struct psock sin, sout;
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char lengthstr[MAX_LENGTH];
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char base64_username_password[MAX_USERNAME_PASSWORD];
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char message[MAX_MESSAGE];
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uint8_t inputbuf[UIP_TCP_MSS];
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uip_ipaddr_t addr;
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};
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struct twitter_state conn;
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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PROCESS(twitter_process, "Twitter client");
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/*---------------------------------------------------------------------------*/
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static uint8_t
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base64_encode_6bits(uint8_t c)
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{
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if(c <= 25) {
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return c + 'A';
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} else if(c <= 51) {
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return c - 26 + 'a';
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} else if(c <= 61) {
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return c - 52 + '0';
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} else if(c == 62) {
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return '+';
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} else if(c == 63) {
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return '/';
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}
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/* This shouldn't happen because only 6 bits of data should be
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passed to this function. */
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return '=';
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}
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/*---------------------------------------------------------------------------*/
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static void
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base64_encode_24bits(const uint8_t inputdata[], char outputdata[], int len)
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{
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switch(len) {
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case 0:
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outputdata[0] = outputdata[1] = outputdata[2] = outputdata[3] = '=';
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break;
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case 1:
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outputdata[0] = base64_encode_6bits((inputdata[0] >> 2) & 0x3f);
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outputdata[1] = base64_encode_6bits((((inputdata[0] << 4) & 0x30)));
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outputdata[2] = outputdata[3] = '=';
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break;
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case 2:
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outputdata[0] = base64_encode_6bits((inputdata[0] >> 2) & 0x3f);
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outputdata[1] = base64_encode_6bits((((inputdata[0] << 4) & 0x30) |
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(inputdata[1] >> 4)) & 0x3f);
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outputdata[2] = base64_encode_6bits((((inputdata[1] << 2) & 0x3f)));
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outputdata[3] = '=';
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break;
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case 3:
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default:
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outputdata[0] = base64_encode_6bits((inputdata[0] >> 2) & 0x3f);
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outputdata[1] = base64_encode_6bits((((inputdata[0] << 4) & 0x30) |
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(inputdata[1] >> 4)) & 0x3f);
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outputdata[2] = base64_encode_6bits((((inputdata[1] << 2) & 0x3c) |
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(inputdata[2] >> 6)) & 0x3f);
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outputdata[3] = base64_encode_6bits((inputdata[2]) & 0x3f);
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break;
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}
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}
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/*---------------------------------------------------------------------------*/
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int
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twitter_post(const uint8_t *username_password, const char *msg)
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{
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int len;
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int i, j;
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struct twitter_state *s;
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process_exit(&twitter_process);
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/* s = (struct twitter_state *)memb_alloc(&conns);*/
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s = &conn;
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if(s == NULL) {
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PRINTF("Could not allocate memory for the tweet\n");
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return 0;
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}
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PSOCK_INIT(&s->sin, (uint8_t *)s->inputbuf, sizeof(s->inputbuf) - 1);
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PSOCK_INIT(&s->sout, (uint8_t *)s->inputbuf, sizeof(s->inputbuf) - 1);
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s->timer = 0;
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/* dec64 encode username:password pair */
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len = strlen((char *)username_password);
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j = 0;
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for(i = 0; i < len; i += 3) {
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base64_encode_24bits(&username_password[i], &s->base64_username_password[j],
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len - i);
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j += 4;
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}
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s->base64_username_password[j] = 0;
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/* Copy the status message, and avoid the leading whitespace. */
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strcpy(s->message, "status=");
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strcpy(&s->message[7], msg);
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/* PRINTF("username_password '%s'\n", s->base64_username_password);
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PRINTF("message '%s'\n", s->message);*/
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/* Spawn process to deal with TCP connection */
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process_start(&twitter_process, (char *)s);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static int
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handle_output(struct twitter_state *s)
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{
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PSOCK_BEGIN(&s->sout);
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/* Send POST header */
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PSOCK_SEND_STR(&s->sout, "POST /statuses/update.json HTTP/1.1\r\n");
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/* Send Authorization header */
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PSOCK_SEND_STR(&s->sout, "Authorization: Basic ");
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PSOCK_SEND_STR(&s->sout, s->base64_username_password);
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PSOCK_SEND_STR(&s->sout, "\r\n");
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/* Send Agent header */
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PSOCK_SEND_STR(&s->sout, "User-Agent: Contiki 2.x\r\n");
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PSOCK_SEND_STR(&s->sout, "Host: twitter.com\r\n");
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PSOCK_SEND_STR(&s->sout, "Accept: */*\r\n");
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/* Send Content length header */
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PSOCK_SEND_STR(&s->sout, "Content-Length: ");
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snprintf(s->lengthstr, sizeof(s->lengthstr), "%d", strlen(s->message));
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PSOCK_SEND_STR(&s->sout, s->lengthstr);
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PSOCK_SEND_STR(&s->sout, "\r\n");
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/* Send Content type header */
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PSOCK_SEND_STR(&s->sout,
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"Content-Type: application/x-www-form-urlencoded\r\n\r\n");
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/* Send status message */
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PSOCK_SEND_STR(&s->sout, s->message);
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/* Close connection */
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PSOCK_CLOSE(&s->sout);
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PSOCK_EXIT(&s->sout);
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PSOCK_END(&s->sout);
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}
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/*---------------------------------------------------------------------------*/
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static int
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handle_input(struct twitter_state *s)
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{
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PSOCK_BEGIN(&s->sin);
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/* We don't care about input data for now */
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PSOCK_END(&s->sin);
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}
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/*---------------------------------------------------------------------------*/
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static void
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handle_connection(struct twitter_state *s)
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{
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handle_input(s);
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handle_output(s);
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(twitter_process, ev, data)
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{
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struct twitter_state *s = data;
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struct uip_conn *conn;
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PROCESS_BEGIN();
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/* Lookup host "twitter.com" */
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/* XXX for now, just use 128.121.146.228 */
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uip_ipaddr(&s->addr, 128,121,146,228);
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/* Open a TCP connection to port 80 on twitter.com */
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conn = tcp_connect(&s->addr, htons(80), s);
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if(conn == NULL) {
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PRINTF("Could not open TCP connection\n");
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/* memb_free(&conns, s);*/
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PROCESS_EXIT();
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}
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while(1) {
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PROCESS_WAIT_EVENT();
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if(ev == tcpip_event) {
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struct twitter_state *s = (struct twitter_state *)data;
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if(uip_closed() || uip_aborted() || uip_timedout()) {
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if(uip_closed()) {
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PRINTF("Connection closed\n");
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} else {
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PRINTF("Connection aborted/timedout\n");
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}
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/* if(s != NULL) {
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memb_free(&conns, s);
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}*/
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PROCESS_EXIT();
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} else if(uip_connected()) {
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handle_connection(s);
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s->timer = 0;
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} else if(s != NULL) {
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if(uip_poll()) {
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++s->timer;
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if(s->timer >= 20) {
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PRINTF("Timed out due to inactivity\n");
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uip_abort();
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PROCESS_EXIT();
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/* memb_free(&conns, s);*/
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}
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} else {
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s->timer = 0;
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}
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handle_connection(s);
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} else {
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PRINTF("Abort because s == NULL\n");
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uip_abort();
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PROCESS_EXIT();
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}
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}
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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