osd-contiki/apps/codeprop/tcp_loader.c

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/*
* Copyright (c) 2005, Swedish Institute of Computer Science
* 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 Institute 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 INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: tcp_loader.c,v 1.2 2006/08/02 14:33:37 bg- Exp $
*/
#include <stdio.h>
#include <string.h>
#include "contiki.h"
#include "sys/etimer.h"
#include "loader/elfloader.h"
#include "net/uip.h"
#include "dev/xmem.h"
#include "codeprop.h"
#define PRINTF(x)
PROCESS(tcp_loader_process, "TCP loader");
static
struct codeprop_state {
u16_t addr;
u16_t len;
struct pt tcpthread_pt;
} s;
/*---------------------------------------------------------------------*/
static
PT_THREAD(recv_tcpthread(struct pt *pt))
{
PT_BEGIN(pt);
/* Read the header. */
PT_WAIT_UNTIL(pt, uip_newdata() && uip_datalen() > 0);
if(uip_datalen() < sizeof(struct codeprop_tcphdr)) {
PRINTF(("codeprop: header not found in first tcp segment\n"));
uip_abort();
goto thread_done;
}
s.len = htons(((struct codeprop_tcphdr *)uip_appdata)->len);
s.addr = 0;
uip_appdata += sizeof(struct codeprop_tcphdr);
uip_len -= sizeof(struct codeprop_tcphdr);
xmem_erase(XMEM_ERASE_UNIT_SIZE, EEPROMFS_ADDR_CODEPROP);
/* Read the rest of the data. */
do {
if(uip_len > 0) {
xmem_pwrite(uip_appdata, uip_len, EEPROMFS_ADDR_CODEPROP + s.addr);
s.addr += uip_len;
}
if(s.addr < s.len) {
PT_YIELD_UNTIL(pt, uip_newdata());
}
} while(s.addr < s.len);
/* Kill old program. */
elfloader_unload();
/* Link, load, and start new program. */
int s;
static char msg[30 + 10];
s = elfloader_load(EEPROMFS_ADDR_CODEPROP);
if (s == ELFLOADER_OK)
sprintf(msg, "ok\n");
else
sprintf(msg, "err %d %s\n", s, elfloader_unknown);
/* Return "ok" message. */
do {
s = strlen(msg);
uip_send(msg, s);
PT_WAIT_UNTIL(pt, uip_acked() || uip_rexmit() || uip_closed());
} while(uip_rexmit());
/* Close the connection. */
uip_close();
thread_done:;
PT_END(pt);
}
/*---------------------------------------------------------------------*/
PROCESS_THREAD(tcp_loader_process, ev, data)
{
PROCESS_BEGIN();
tcp_listen(HTONS(CODEPROP_DATA_PORT));
while(1) {
PROCESS_YIELD();
if(ev == tcpip_event && uip_conn->lport == HTONS(CODEPROP_DATA_PORT)) {
if(uip_connected()) { /* Really uip_connecting()!!! */
if(data == NULL) {
PT_INIT(&s.tcpthread_pt);
process_poll(&tcp_loader_process);
tcp_markconn(uip_conn, &s);
} else {
PRINTF(("codeprop: uip_connected() and data != NULL\n"));
uip_abort();
}
}
recv_tcpthread(&s.tcpthread_pt); /* Run thread */
if(uip_closed() || uip_aborted() || uip_timedout()) {
PRINTF(("codeprop: connection down\n"));
tcp_markconn(uip_conn, NULL);
}
}
}
PROCESS_END();
}