440 lines
11 KiB
C
440 lines
11 KiB
C
/**
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* \addtogroup apps
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* @{
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*/
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/**
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* \defgroup webclient Web client
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* @{
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*
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* This example shows a HTTP client that is able to download web pages
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* and files from web servers. It requires a number of callback
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* functions to be implemented by the module that utilizes the code:
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* webclient_datahandler(), webclient_connected(),
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* webclient_timedout(), webclient_aborted(), webclient_closed().
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*/
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/**
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* \file
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* Implementation of the HTTP client.
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* \author Adam Dunkels <adam@dunkels.com>
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*/
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/*
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* Copyright (c) 2002, Adam Dunkels.
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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
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This file is part of the uIP TCP/IP stack.
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*
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* $Id: webclient.c,v 1.2 2006/06/11 21:46:37 adam Exp $
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*
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*/
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#include "uip.h"
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#include "uiplib.h"
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#include "webclient.h"
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#include "resolv.h"
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#include <string.h>
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#define WEBCLIENT_TIMEOUT 100
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#define WEBCLIENT_STATE_STATUSLINE 0
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#define WEBCLIENT_STATE_HEADERS 1
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#define WEBCLIENT_STATE_DATA 2
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#define WEBCLIENT_STATE_CLOSE 3
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#define HTTPFLAG_NONE 0
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#define HTTPFLAG_OK 1
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#define HTTPFLAG_MOVED 2
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#define HTTPFLAG_ERROR 3
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#define ISO_nl 0x0a
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#define ISO_cr 0x0d
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#define ISO_space 0x20
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static struct webclient_state s;
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/*-----------------------------------------------------------------------------------*/
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char *
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webclient_mimetype(void)
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{
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return s.mimetype;
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}
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/*-----------------------------------------------------------------------------------*/
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char *
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webclient_filename(void)
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{
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return s.file;
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}
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/*-----------------------------------------------------------------------------------*/
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char *
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webclient_hostname(void)
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{
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return s.host;
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}
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/*-----------------------------------------------------------------------------------*/
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unsigned short
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webclient_port(void)
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{
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return s.port;
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}
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/*-----------------------------------------------------------------------------------*/
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void
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webclient_init(void)
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{
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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init_connection(void)
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{
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s.state = WEBCLIENT_STATE_STATUSLINE;
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s.getrequestleft = sizeof(http_get) - 1 + 1 +
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sizeof(http_10) - 1 +
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sizeof(http_crnl) - 1 +
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sizeof(http_host) - 1 +
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sizeof(http_crnl) - 1 +
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strlen(http_user_agent_fields) +
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strlen(s.file) + strlen(s.host);
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s.getrequestptr = 0;
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s.httpheaderlineptr = 0;
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}
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/*-----------------------------------------------------------------------------------*/
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void
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webclient_close(void)
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{
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s.state = WEBCLIENT_STATE_CLOSE;
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}
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/*-----------------------------------------------------------------------------------*/
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unsigned char
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webclient_get(char *host, u16_t port, char *file)
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{
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struct uip_conn *conn;
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uip_ipaddr_t *ipaddr;
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static uip_ipaddr_t addr;
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/* First check if the host is an IP address. */
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ipaddr = &addr;
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if(uiplib_ipaddrconv(host, (unsigned char *)addr) == 0) {
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ipaddr = (uip_ipaddr_t *)resolv_lookup(host);
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if(ipaddr == NULL) {
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return 0;
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}
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}
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conn = uip_connect(ipaddr, htons(port));
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if(conn == NULL) {
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return 0;
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}
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s.port = port;
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strncpy(s.file, file, sizeof(s.file));
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strncpy(s.host, host, sizeof(s.host));
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init_connection();
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return 1;
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}
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/*-----------------------------------------------------------------------------------*/
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static unsigned char *
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copy_string(unsigned char *dest,
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const unsigned char *src, unsigned char len)
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{
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strncpy(dest, src, len);
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return dest + len;
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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senddata(void)
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{
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u16_t len;
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char *getrequest;
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char *cptr;
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if(s.getrequestleft > 0) {
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cptr = getrequest = (char *)uip_appdata;
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cptr = copy_string(cptr, http_get, sizeof(http_get) - 1);
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cptr = copy_string(cptr, s.file, strlen(s.file));
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*cptr++ = ISO_space;
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cptr = copy_string(cptr, http_10, sizeof(http_10) - 1);
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cptr = copy_string(cptr, http_crnl, sizeof(http_crnl) - 1);
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cptr = copy_string(cptr, http_host, sizeof(http_host) - 1);
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cptr = copy_string(cptr, s.host, strlen(s.host));
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cptr = copy_string(cptr, http_crnl, sizeof(http_crnl) - 1);
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cptr = copy_string(cptr, http_user_agent_fields,
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strlen(http_user_agent_fields));
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len = s.getrequestleft > uip_mss()?
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uip_mss():
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s.getrequestleft;
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uip_send(&(getrequest[s.getrequestptr]), len);
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}
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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acked(void)
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{
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u16_t len;
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if(s.getrequestleft > 0) {
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len = s.getrequestleft > uip_mss()?
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uip_mss():
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s.getrequestleft;
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s.getrequestleft -= len;
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s.getrequestptr += len;
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}
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}
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/*-----------------------------------------------------------------------------------*/
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static u16_t
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parse_statusline(u16_t len)
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{
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char *cptr;
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while(len > 0 && s.httpheaderlineptr < sizeof(s.httpheaderline)) {
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s.httpheaderline[s.httpheaderlineptr] = *(char *)uip_appdata;
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++((char *)uip_appdata);
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--len;
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if(s.httpheaderline[s.httpheaderlineptr] == ISO_nl) {
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if((strncmp(s.httpheaderline, http_10,
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sizeof(http_10) - 1) == 0) ||
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(strncmp(s.httpheaderline, http_11,
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sizeof(http_11) - 1) == 0)) {
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cptr = &(s.httpheaderline[9]);
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s.httpflag = HTTPFLAG_NONE;
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if(strncmp(cptr, http_200, sizeof(http_200) - 1) == 0) {
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/* 200 OK */
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s.httpflag = HTTPFLAG_OK;
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} else if(strncmp(cptr, http_301, sizeof(http_301) - 1) == 0 ||
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strncmp(cptr, http_302, sizeof(http_302) - 1) == 0) {
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/* 301 Moved permanently or 302 Found. Location: header line
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will contain thw new location. */
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s.httpflag = HTTPFLAG_MOVED;
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} else {
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s.httpheaderline[s.httpheaderlineptr - 1] = 0;
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}
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} else {
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uip_abort();
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webclient_aborted();
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return 0;
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}
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/* We're done parsing the status line, so we reset the pointer
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and start parsing the HTTP headers.*/
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s.httpheaderlineptr = 0;
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s.state = WEBCLIENT_STATE_HEADERS;
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break;
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} else {
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++s.httpheaderlineptr;
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}
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}
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return len;
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}
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/*-----------------------------------------------------------------------------------*/
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static char
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casecmp(char *str1, const char *str2, char len)
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{
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static char c;
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while(len > 0) {
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c = *str1;
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/* Force lower-case characters. */
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if(c & 0x40) {
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c |= 0x20;
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}
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if(*str2 != c) {
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return 1;
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}
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++str1;
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++str2;
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--len;
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}
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return 0;
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}
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/*-----------------------------------------------------------------------------------*/
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static u16_t
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parse_headers(u16_t len)
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{
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char *cptr;
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static unsigned char i;
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while(len > 0 && s.httpheaderlineptr < sizeof(s.httpheaderline)) {
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s.httpheaderline[s.httpheaderlineptr] = *(char *)uip_appdata;
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++((char *)uip_appdata);
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--len;
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if(s.httpheaderline[s.httpheaderlineptr] == ISO_nl) {
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/* We have an entire HTTP header line in s.httpheaderline, so
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we parse it. */
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if(s.httpheaderline[0] == ISO_cr) {
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/* This was the last header line (i.e., and empty "\r\n"), so
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we are done with the headers and proceed with the actual
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data. */
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s.state = WEBCLIENT_STATE_DATA;
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return len;
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}
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s.httpheaderline[s.httpheaderlineptr - 1] = 0;
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/* Check for specific HTTP header fields. */
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if(casecmp(s.httpheaderline, http_content_type,
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sizeof(http_content_type) - 1) == 0) {
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/* Found Content-type field. */
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cptr = strchr(s.httpheaderline, ';');
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if(cptr != NULL) {
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*cptr = 0;
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}
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strncpy(s.mimetype, s.httpheaderline +
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sizeof(http_content_type) - 1, sizeof(s.mimetype));
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} else if(casecmp(s.httpheaderline, http_location,
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sizeof(http_location) - 1) == 0) {
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cptr = s.httpheaderline +
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sizeof(http_location) - 1;
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if(strncmp(cptr, http_http, 7) == 0) {
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cptr += 7;
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for(i = 0; i < s.httpheaderlineptr - 7; ++i) {
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if(*cptr == 0 ||
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*cptr == '/' ||
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*cptr == ' ' ||
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*cptr == ':') {
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s.host[i] = 0;
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break;
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}
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s.host[i] = *cptr;
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++cptr;
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}
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}
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strncpy(s.file, cptr, sizeof(s.file));
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/* s.file[s.httpheaderlineptr - i] = 0;*/
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}
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/* We're done parsing, so we reset the pointer and start the
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next line. */
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s.httpheaderlineptr = 0;
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} else {
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++s.httpheaderlineptr;
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}
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}
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return len;
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}
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/*-----------------------------------------------------------------------------------*/
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static void
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newdata(void)
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{
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u16_t len;
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len = uip_datalen();
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if(s.state == WEBCLIENT_STATE_STATUSLINE) {
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len = parse_statusline(len);
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}
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if(s.state == WEBCLIENT_STATE_HEADERS && len > 0) {
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len = parse_headers(len);
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}
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if(len > 0 && s.state == WEBCLIENT_STATE_DATA &&
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s.httpflag != HTTPFLAG_MOVED) {
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webclient_datahandler((char *)uip_appdata, len);
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}
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}
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/*-----------------------------------------------------------------------------------*/
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void
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webclient_appcall(void)
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{
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if(uip_connected()) {
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s.timer = 0;
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s.state = WEBCLIENT_STATE_STATUSLINE;
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senddata();
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webclient_connected();
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return;
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}
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if(s.state == WEBCLIENT_STATE_CLOSE) {
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webclient_closed();
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uip_abort();
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return;
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}
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if(uip_aborted()) {
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webclient_aborted();
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}
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if(uip_timedout()) {
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webclient_timedout();
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}
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if(uip_acked()) {
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s.timer = 0;
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acked();
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}
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if(uip_newdata()) {
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s.timer = 0;
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newdata();
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}
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if(uip_rexmit() ||
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uip_newdata() ||
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uip_acked()) {
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senddata();
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} else if(uip_poll()) {
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++s.timer;
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if(s.timer == WEBCLIENT_TIMEOUT) {
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webclient_timedout();
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uip_abort();
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return;
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}
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/* senddata();*/
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}
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if(uip_closed()) {
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if(s.httpflag != HTTPFLAG_MOVED) {
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/* Send NULL data to signal EOF. */
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webclient_datahandler(NULL, 0);
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} else {
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if(resolv_lookup(s.host) == NULL) {
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resolv_query(s.host);
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}
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webclient_get(s.host, s.port, s.file);
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}
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}
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}
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/*-----------------------------------------------------------------------------------*/
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/** @} */
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/** @} */
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