From 28e08c18929a9841cd36f6ba726048e10fe4168e Mon Sep 17 00:00:00 2001
From: patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>
Date: Fri, 30 Nov 2007 23:15:06 +0000
Subject: Basic DHPC client functionality

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@419 42af7a65-404d-4744-a932-0658087f49c3
---
 nuttx/netutils/dhcpc/dhcpc.c | 31 ++++++++++++++++++++++++-------
 1 file changed, 24 insertions(+), 7 deletions(-)

(limited to 'nuttx/netutils/dhcpc')

diff --git a/nuttx/netutils/dhcpc/dhcpc.c b/nuttx/netutils/dhcpc/dhcpc.c
index 0188128f2..e0ee702c2 100644
--- a/nuttx/netutils/dhcpc/dhcpc.c
+++ b/nuttx/netutils/dhcpc/dhcpc.c
@@ -183,18 +183,12 @@ static uint8 *add_end(uint8 *optptr)
 
 static void create_msg(struct dhcpc_state_s *pdhcpc)
 {
-  struct in_addr addr;
-
   memset(&pdhcpc->packet, 0, sizeof(struct dhcp_msg));
   pdhcpc->packet.op    = DHCP_REQUEST;
   pdhcpc->packet.htype = DHCP_HTYPE_ETHERNET;
   pdhcpc->packet.hlen  = pdhcpc->ds_maclen;
   memcpy(pdhcpc->packet.xid, xid, 4);
   pdhcpc->packet.flags = HTONS(BOOTP_BROADCAST); /*  Broadcast bit. */
-
-  uip_gethostaddr("eth0", &addr);
-  memcpy(&pdhcpc->packet.ciaddr, &addr.s_addr, 4);
-
   memcpy(pdhcpc->packet.chaddr, pdhcpc->ds_macaddr, pdhcpc->ds_maclen);
   memset(&pdhcpc->packet.chaddr[pdhcpc->ds_maclen], 0, 16 - pdhcpc->ds_maclen);
   memcpy(pdhcpc->packet.options, magic_cookie, sizeof(magic_cookie));
@@ -206,13 +200,20 @@ static int send_discover(struct dhcpc_state_s *pdhcpc)
   uint8 *pend;
   int len;
 
+  /* Create the basic message header */
+
   create_msg(pdhcpc);
+
+  /* Add the options */
+
   pend = &pdhcpc->packet.options[4];
   pend = add_msg_type(pend, DHCPDISCOVER);
   pend = add_req_options(pend);
   pend = add_end(pend);
   len  = pend - (uint8*)&pdhcpc->packet;
 
+  /* Send the request */
+
   addr.sin_family      = AF_INET;
   addr.sin_port        = HTONS(DHCPC_SERVER_PORT);
   addr.sin_addr.s_addr = INADDR_BROADCAST;
@@ -226,7 +227,13 @@ static int send_request(struct dhcpc_state_s *pdhcpc, struct dhcpc_state *presul
   uint8 *pend;
   int len;
 
+  /* Create the basic message header */
+
   create_msg(pdhcpc);
+  memcpy(pdhcpc->packet.ciaddr, &presult->ipaddr.s_addr, 4);
+
+  /* Add the options */
+
   pend = &pdhcpc->packet.options[4];
   pend = add_msg_type(pend, DHCPREQUEST);
   pend = add_server_id(presult, pend);
@@ -234,6 +241,8 @@ static int send_request(struct dhcpc_state_s *pdhcpc, struct dhcpc_state *presul
   pend = add_end(pend);
   len  = pend - (uint8*)&pdhcpc->packet;
 
+  /* Send the request */
+
   addr.sin_family      = AF_INET;
   addr.sin_port        = HTONS(DHCPC_SERVER_PORT);
   addr.sin_addr.s_addr = INADDR_BROADCAST;
@@ -336,7 +345,7 @@ void *dhcpc_open(const void *macaddr, int maclen)
 
       /* Configure for read timeouts */
 
-      tv.tv_sec  = 30;
+      tv.tv_sec  = 10;
       tv.tv_usec = 0;
       if (setsockopt(pdhcpc->sockfd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(struct timeval)) < 0)
         {
@@ -361,9 +370,15 @@ void dhcpc_close(void *handle)
 int dhcpc_request(void *handle, struct dhcpc_state *presult)
 {
   struct dhcpc_state_s *pdhcpc = (struct dhcpc_state_s *)handle;
+  struct in_addr oldaddr;
   ssize_t result;
   int state;
 
+  /* Save the currently assigned IP address (should be zero) */
+
+  oldaddr.s_addr = 0;
+  uip_gethostaddr("eth0", &oldaddr);
+
   /* Loop until we receive the offer */
 
   do
@@ -386,6 +401,7 @@ int dhcpc_request(void *handle, struct dhcpc_state *presult)
             {
               if (parse_msg(pdhcpc, result, presult) == DHCPOFFER)
                 {
+                  (void)uip_sethostaddr("eth0", &presult->ipaddr);
                   state = STATE_OFFER_RECEIVED;
                 }
             }
@@ -421,6 +437,7 @@ int dhcpc_request(void *handle, struct dhcpc_state *presult)
             {
               /* An error other than a timeout was received */
 
+              (void)uip_sethostaddr("eth0", &oldaddr);
               return ERROR;
             }
         }
-- 
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