ppp_dhcp.c

在ARM7和UC/OSII的平台上实现了GPS自动报站的功能,涉及GPS模块LEA_4S的驱动,位置速寻算法,语音芯片ISD4004的录放音驱动,LED页面管理等等.从启动代码到操作系统的移植以及到业

/*
 * FILENAME: ppp_dhcp.c
 *
 * Copyright 1997- 2001 By InterNiche Technologies Inc. All rights reserved
 *
 * Routines for running DHCP over PPP
 *
 * MODULE: PPP
 *
 * PORTABLE: yes
 */

#include "ipport.h"

#ifdef USE_PPP          /* ifdef whole file */

#include "ppp_port.h"
#include "mppp.h"


#ifdef PPP_DHCP_CLIENT

#include "dhcpclnt.h"

int   dhc_port_ipset(int iface, int state);     /* prototype success callback */
void  dhcp_timeout(M_PPP mppp, long arg);     /* time expired callback */

#ifndef PPP_DHCP_TMO
#define  PPP_DHCP_TMO      10    /* dhcp client timeout, in seconds */
#endif

/* FUNCTION: ppp_start_dhcp()
 *
 * ppp_start_dhcp() - start client DHCP on the interface
 * corresponding to the PPP unit.  This is called from ipcp_up in
 * ipcp.c. Note that the IP address, which may have already been
 * either negotiated as part of IPCP or pre-configured from NVRAM, is
 * replaced with 0.0.0.0 while DHCP packets exchange. Although
 * technically up, only DHCP client packets are allowed in and out the
 * PPP interface until DHCP has completed.
 *
 * 
 * PARAM1: int unit; a PPP unit number
 *
 * RETURNS: void
 */

void
ppp_start_dhcp(M_PPP mppp)
{
   int iface;

   iface = net_num(mppp->ifp);

   dhc_states[iface].state = DHCS_INIT;   /* set up for DHCP activity */
   dhc_set_callback(iface, dhc_port_ipset);     /* set callback routine */
   dhc_discover(iface);                         /* send 1st DHCP discovery */

   /* set timer for DHCP completion */
   ppp_settimer(mppp, dhcp_timeout, PPP_DHCP_TMO, (long)iface);

   //ConPrintf("ppp_start_dhcp: ppp_timeout in %d secs\n", PPP_DHCP_TMO);
}



/* FUNCTION: dhcp_timeout()
 * 
 * PARAM1: void * arg
 *
 * RETURNS: 
 */

void
dhcp_timeout(M_PPP mppp, long arg)
{
   int      iface =  (int)arg;
   NET      ifp;
   PACKET   pkt;

   ifp = if_getbynum(iface);

   //ConPrintf("dhcp_timeout: iface %d\n", iface);
#ifdef NOTDEF
   dhc_states[iface].state = DHCS_TIMEOUT;
#endif

   /* restore default IP from NV - may be 0.0.0.0 */
   ifp->n_ipaddr = mppp->default_ip; 
   dhc_halt(iface);           /* stop dhcp client retrys for this net */

   /* clean up any traffic we queued */
   while(mppp->dataq.q_head)
   {
      pkt = (PACKET)getq(&mppp->dataq);
      LOCK_NET_RESOURCE(FREEQ_RESID);
      pk_free(pkt);
      UNLOCK_NET_RESOURCE(FREEQ_RESID);
   }
}


/* FUNCTION: dhc_port_ipset()
 *
 * dhc_port_ipset() is called directly from dhcpclnt.c when the DHCP 
 * client changes state; DHCS_BOUND corresponds to receipt of 
 *
 * 
 * PARAM1: int iface
 * PARAM2: int state
 *
 * RETURNS: 
 */

int
dhc_port_ipset(int iface, int state)
{
   NET   ifp;
   M_PPP mppp;

   ifp = if_getbynum(iface);
   mppp = (M_PPP)ifp->n_local;

   if (state == DHCS_BOUND)
   {
      //ConPrintf("DHCP assigned PPP link IP=%u.%u.%u.%u\n", 
         //PUSH_IPADDR(ifp->n_ipaddr));

      ppp_cleartimer(mppp);      /* kill timer */
      ppp_allpktsend(mppp);      /* move along any traffic we queued */
   }
   return 0;
}

#endif   /* PPP_DHCP_CLIENT */
#endif   /* USE_PPP */