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/****************************************************************************
* netutils/webclient/webclient.c
* Implementation of the HTTP client.
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Based on uIP which also has a BSD style license:
*
* 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 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().
*/
/****************************************************************************
* Included Files
****************************************************************************/
#include <sys/types.h>
#include <string.h>
#include <sys/socket.h>
#include <net/uip/uip.h>
#include <net/uip/resolv.h>
#include <net/uip/uip-arch.h>
#include <net/uip/uip-lib.h>
#include "webclient.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 shortwebclient_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(const char *host, uint16 port, char *file)
{
uip_ipaddr_t *ipaddr;
static uip_ipaddr_t addr;
struct sockaddr_in server;
int sockfd;
/* First check if the host is an IP address. */
ipaddr = &addr;
if (uiplib_ipaddrconv(host, (unsigned char *)addr) == 0)
{
if (resolv_query(host, &ipaddr) < 0)
{
return ERROR;
}
}
/* Create a socket */
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
{
return ERROR;
}
/* Connect to server. First we have to set some fields in the
* 'server' structure. The system will assign me an arbitrary
* local port that is not in use.
*/
server.sin_family = AF_INET;
memcpy(&server.sin_addr.s_addr, &host, sizeof(in_addr_t));
server.sin_port = htons(port);
if (connect(sockfd, (struct sockaddr *)&server, sizeof(struct sockaddr_in)) < 0)
{
return ERROR;
}
s.port = port;
strncpy(s.file, file, sizeof(s.file));
strncpy(s.host, host, sizeof(s.host));
init_connection();
return OK;
}
static char *copy_string(char *dest, const char *src, int len)
{
strncpy(dest, src, len);
return dest + len;
}
static void senddata(struct uip_driver_s *dev)
{
uint16 len;
char *getrequest;
char *cptr;
if (s.getrequestleft > 0) {
cptr = getrequest = (char *)dev->d_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(dev, &(getrequest[s.getrequestptr]), len);
}
}
static void acked(void)
{
uint16 len;
if (s.getrequestleft > 0) {
len = s.getrequestleft > uip_mss()?
uip_mss():
s.getrequestleft;
s.getrequestleft -= len;
s.getrequestptr += len;
}
}
static uint16 parse_statusline(struct uip_driver_s *dev, uint16 len)
{
char *cptr;
while(len > 0 && s.httpheaderlineptr < sizeof(s.httpheaderline))
{
char *pappdata = (char*)dev->d_appdata;
s.httpheaderline[s.httpheaderlineptr] = *pappdata++;
dev->d_appdata = (void*)pappdata;
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 uint16 parse_headers(struct uip_driver_s *dev, uint16 len)
{
char *cptr;
static unsigned char i;
while(len > 0 && s.httpheaderlineptr < sizeof(s.httpheaderline))
{
char *pappdata = (char*)dev->d_appdata;
s.httpheaderline[s.httpheaderlineptr] = *pappdata++;
dev->d_appdata = (void*)pappdata;
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));
}
/* 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(struct uip_driver_s *dev)
{
uint16 len;
len = uip_datalen(dev);
if (s.state == WEBCLIENT_STATE_STATUSLINE) {
len = parse_statusline(dev, len);
}
if (s.state == WEBCLIENT_STATE_HEADERS && len > 0) {
len = parse_headers(dev, len);
}
if (len > 0 && s.state == WEBCLIENT_STATE_DATA &&
s.httpflag != HTTPFLAG_MOVED) {
webclient_datahandler((char *)dev->d_appdata, len);
}
}
/* This function is called by the UIP interrupt handling logic whenevent an
* event of interest occurs.
*/
void uip_interrupt_event(struct uip_driver_s *dev)
{
#warning OBSOLETE -- needs to be redesigned
if (uip_connected_event())
{
s.timer = 0;
s.state = WEBCLIENT_STATE_STATUSLINE;
senddata(dev);
webclient_connected();
return;
}
if (s.state == WEBCLIENT_STATE_CLOSE)
{
webclient_closed();
uip_abort();
return;
}
if (uip_abort_event())
{
webclient_aborted();
}
if (uip_timeout_event())
{
webclient_timedout();
}
if (uip_ack_event())
{
s.timer = 0;
acked();
}
if (uip_newdata_event())
{
s.timer = 0;
newdata(dev);
}
if (uip_rexmit_event() || uip_newdata_event() || uip_ack_event())
{
senddata(dev);
}
else if (uip_poll_event())
{
++s.timer;
if (s.timer == WEBCLIENT_TIMEOUT)
{
webclient_timedout();
uip_abort();
return;
}
}
if (uip_close_event())
{
if (s.httpflag != HTTPFLAG_MOVED)
{
/* Send NULL data to signal EOF. */
webclient_datahandler(NULL, 0);
}
else
{
#ifdef CONFIG_NET_IPv6
struct sockaddr_in6 addr;
#else
struct sockaddr_in addr;
#endif
if (resolv_query(s.host, &addr) < 0)
{
return;
}
webclient_get(s.host, s.port, s.file);
}
}
}
|