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