Move nuttx/netutils to apps/netutils

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3401 42af7a65-404d-4744-a932-0658087f49c3

2 files changed, 701 insertions, 0 deletions

diff --git a/apps/netutils/dhcpc/Makefile b/apps/netutils/dhcpc/Makefile
new file mode 100644
index 000000000..7209907de
--- /dev/null
+++ b/apps/netutils/dhcpc/Makefile
@@ -0,0 +1,94 @@
+############################################################################
+# apps/netutils/dhcpc/Makefile
+#
+#   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# 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 NuttX 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 COPYRIGHT HOLDERS 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
+# COPYRIGHT OWNER 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.
+#
+############################################################################
+
+-include $(TOPDIR)/.config
+-include $(TOPDIR)/Make.defs
+include $(APPDIR)/Make.defs
+
+# DHCP Client Library
+
+ASRCS		=
+CSRCS		= 
+
+ifeq ($(CONFIG_NET_UDP),y)
+CSRCS		+= dhcpc.c
+endif
+
+AOBJS		= $(ASRCS:.S=$(OBJEXT))
+COBJS		= $(CSRCS:.c=$(OBJEXT))
+
+SRCS		= $(ASRCS) $(CSRCS)
+OBJS		= $(AOBJS) $(COBJS)
+
+BIN	    	= ../../libapps$(LIBEXT)
+
+ROOTDEPPATH	= --dep-path .
+
+# Common build
+
+VPATH		= 
+
+all: .built
+
+$(AOBJS): %$(OBJEXT): %.S
+	$(call ASSEMBLE, $<, $@)
+
+$(COBJS): %$(OBJEXT): %.c
+	$(call COMPILE, $<, $@)
+
+$(BIN):	$(OBJS)
+	@( for obj in $(OBJS) ; do \
+		$(call ARCHIVE, $@, $${obj}); \
+	done ; )
+	@touch .built
+	
+.built: $(BIN)
+
+.depend: Makefile $(SRCS)
+	@$(MKDEP) $(ROOTDEPPATH) \
+	  $(CC) -- $(CFLAGS) -- $(SRCS) >Make.dep
+	@touch $@
+
+# Register application
+depend: .depend
+
+clean:
+	@rm -f $(BIN) *.o *~ .*.swp .built
+	$(call CLEAN)
+
+distclean: clean
+	@rm -f Make.dep .depend
+
+-include Make.dep
diff --git a/apps/netutils/dhcpc/dhcpc.c b/apps/netutils/dhcpc/dhcpc.c
new file mode 100644
index 000000000..dc80988bb
--- /dev/null
+++ b/apps/netutils/dhcpc/dhcpc.c
@@ -0,0 +1,607 @@
+/****************************************************************************
+ * netutils/dhcpc/dhcpc.c
+ *
+ *   Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Based heavily on portions of uIP:
+ *
+ *   Author: Adam Dunkels <adam@dunkels.com>
+ *   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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <sys/types.h>
+#include <sys/socket.h>
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+#include <time.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <net/uip/uip.h>
+#include <apps/netutils/dhcpc.h>
+#include <apps/netutils/uiplib.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+#define STATE_INITIAL           0
+#define STATE_HAVE_OFFER        1
+#define STATE_HAVE_LEASE        2
+
+#define BOOTP_BROADCAST         0x8000
+
+#define DHCP_REQUEST            1
+#define DHCP_REPLY              2
+#define DHCP_HTYPE_ETHERNET     1
+#define DHCP_HLEN_ETHERNET      6
+#define DHCP_MSG_LEN            236
+
+#define DHCPC_SERVER_PORT       67
+#define DHCPC_CLIENT_PORT       68
+
+#define DHCPDISCOVER            1
+#define DHCPOFFER               2
+#define DHCPREQUEST             3
+#define DHCPDECLINE             4
+#define DHCPACK                 5
+#define DHCPNAK                 6
+#define DHCPRELEASE             7
+
+#define DHCP_OPTION_SUBNET_MASK 1
+#define DHCP_OPTION_ROUTER      3
+#define DHCP_OPTION_DNS_SERVER  6
+#define DHCP_OPTION_REQ_IPADDR  50
+#define DHCP_OPTION_LEASE_TIME  51
+#define DHCP_OPTION_MSG_TYPE    53
+#define DHCP_OPTION_SERVER_ID   54
+#define DHCP_OPTION_REQ_LIST    55
+#define DHCP_OPTION_END         255
+
+#define BUFFER_SIZE             256
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+struct dhcp_msg
+{
+  uint8_t  op;
+  uint8_t  htype;
+  uint8_t  hlen;
+  uint8_t  hops;
+  uint8_t  xid[4];
+  uint16_t secs;
+  uint16_t flags;
+  uint8_t  ciaddr[4];
+  uint8_t  yiaddr[4];
+  uint8_t  siaddr[4];
+  uint8_t  giaddr[4];
+  uint8_t  chaddr[16];
+#ifndef CONFIG_NET_DHCP_LIGHT
+  uint8_t  sname[64];
+  uint8_t  file[128];
+#endif
+  uint8_t  options[312];
+};
+
+struct dhcpc_state_s
+{
+  struct uip_udp_conn *ds_conn;
+  const void          *ds_macaddr;
+  int                  ds_maclen;
+  int                  sockfd;
+  struct in_addr       ipaddr;
+  struct in_addr       serverid;
+  struct dhcp_msg      packet;
+};
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const uint8_t xid[4]          = {0xad, 0xde, 0x12, 0x23};
+static const uint8_t magic_cookie[4] = {99, 130, 83, 99};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: dhcpc_add<option>
+ ****************************************************************************/
+
+static uint8_t *dhcpc_addmsgtype(uint8_t *optptr, uint8_t type)
+{
+  *optptr++ = DHCP_OPTION_MSG_TYPE;
+  *optptr++ = 1;
+  *optptr++ = type;
+  return optptr;
+}
+
+static uint8_t *dhcpc_addserverid(struct in_addr *serverid, uint8_t *optptr)
+{
+  *optptr++ = DHCP_OPTION_SERVER_ID;
+  *optptr++ = 4;
+  memcpy(optptr, &serverid->s_addr, 4);
+  return optptr + 4;
+}
+
+static uint8_t *dhcpc_addreqipaddr(struct in_addr *ipaddr, uint8_t *optptr)
+{
+  *optptr++ = DHCP_OPTION_REQ_IPADDR;
+  *optptr++ = 4;
+  memcpy(optptr, &ipaddr->s_addr, 4);
+  return optptr + 4;
+}
+
+static uint8_t *dhcpc_addreqoptions(uint8_t *optptr)
+{
+  *optptr++ = DHCP_OPTION_REQ_LIST;
+  *optptr++ = 3;
+  *optptr++ = DHCP_OPTION_SUBNET_MASK;
+  *optptr++ = DHCP_OPTION_ROUTER;
+  *optptr++ = DHCP_OPTION_DNS_SERVER;
+  return optptr;
+}
+
+static uint8_t *dhcpc_addend(uint8_t *optptr)
+{
+  *optptr++ = DHCP_OPTION_END;
+  return optptr;
+}
+
+/****************************************************************************
+ * Name: dhcpc_sendmsg
+ ****************************************************************************/
+
+static int dhcpc_sendmsg(struct dhcpc_state_s *pdhcpc,
+                         struct dhcpc_state *presult, int msgtype)
+{
+  struct sockaddr_in addr;
+  uint8_t *pend;
+  in_addr_t serverid = INADDR_BROADCAST;
+  int len;
+
+  /* Create the common message header settings */
+
+  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);
+  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));
+
+  /* Add the common header options */
+
+  pend = &pdhcpc->packet.options[4];
+  pend = dhcpc_addmsgtype(pend, msgtype);
+
+  /* Handle the message specific settings */
+
+  switch (msgtype)
+    {
+      /* Broadcast DISCOVER message to all servers */
+
+      case DHCPDISCOVER:
+        pdhcpc->packet.flags = HTONS(BOOTP_BROADCAST); /*  Broadcast bit. */
+        pend     = dhcpc_addreqoptions(pend);
+        break;
+
+      /* Send REQUEST message to the server that sent the *first* OFFER */
+
+      case DHCPREQUEST:
+        pdhcpc->packet.flags = HTONS(BOOTP_BROADCAST); /*  Broadcast bit. */
+        memcpy(pdhcpc->packet.ciaddr, &pdhcpc->ipaddr.s_addr, 4);
+        pend     = dhcpc_addserverid(&pdhcpc->serverid, pend);
+        pend     = dhcpc_addreqipaddr(&pdhcpc->ipaddr, pend);
+        break;
+
+      /* Send DECLINE message to the server that sent the *last* OFFER */
+
+      case DHCPDECLINE:
+        memcpy(pdhcpc->packet.ciaddr, &presult->ipaddr.s_addr, 4);
+        pend     = dhcpc_addserverid(&presult->serverid, pend);
+        serverid = presult->serverid.s_addr;
+        break;
+
+      default:
+        return ERROR;
+    }
+
+  pend = dhcpc_addend(pend);
+  len  = pend - (uint8_t*)&pdhcpc->packet;
+
+  /* Send the request */
+
+  addr.sin_family      = AF_INET;
+  addr.sin_port        = HTONS(DHCPC_SERVER_PORT);
+  addr.sin_addr.s_addr = serverid;
+
+  return sendto(pdhcpc->sockfd, &pdhcpc->packet, len, 0,
+                (struct sockaddr*)&addr, sizeof(struct sockaddr_in));
+}
+
+/****************************************************************************
+ * Name: dhcpc_parseoptions
+ ****************************************************************************/
+
+static uint8_t dhcpc_parseoptions(struct dhcpc_state *presult, uint8_t *optptr, int len)
+{
+  uint8_t *end = optptr + len;
+  uint8_t type = 0;
+
+  while (optptr < end)
+    {
+      switch(*optptr)
+        {
+          case DHCP_OPTION_SUBNET_MASK:
+            /* Get subnet mask in network order */
+
+            memcpy(&presult->netmask.s_addr, optptr + 2, 4);
+            break;
+
+          case DHCP_OPTION_ROUTER:
+            /* Get the default router address in network order */
+
+            memcpy(&presult->default_router.s_addr, optptr + 2, 4);
+            break;
+
+          case DHCP_OPTION_DNS_SERVER:
+            /* Get the DNS server address in network order */
+
+            memcpy(&presult->dnsaddr.s_addr, optptr + 2, 4);
+            break;
+
+          case DHCP_OPTION_MSG_TYPE:
+            /* Get message type */
+
+            type = *(optptr + 2);
+            break;
+
+          case DHCP_OPTION_SERVER_ID:
+            /* Get server address in network order */
+
+            memcpy(&presult->serverid.s_addr, optptr + 2, 4);
+            break;
+
+          case DHCP_OPTION_LEASE_TIME:
+            {
+              /* Get lease time (in seconds) in host order */
+
+              uint16_t tmp[2];
+              memcpy(tmp, optptr + 2, 4);
+              presult->lease_time = ((uint32_t)ntohs(tmp[0])) << 16 | (uint32_t)ntohs(tmp[1]);
+            }
+            break;
+
+          case DHCP_OPTION_END:
+            return type;
+        }
+
+      optptr += optptr[1] + 2;
+    }
+  return type;
+}
+
+/****************************************************************************
+ * Name: dhcpc_parsemsg
+ ****************************************************************************/
+
+static uint8_t dhcpc_parsemsg(struct dhcpc_state_s *pdhcpc, int buflen,
+                            struct dhcpc_state *presult)
+{
+  if (pdhcpc->packet.op == DHCP_REPLY &&
+      memcmp(pdhcpc->packet.xid, xid, sizeof(xid)) == 0 &&
+      memcmp(pdhcpc->packet.chaddr, pdhcpc->ds_macaddr, pdhcpc->ds_maclen) == 0)
+    {
+      memcpy(&presult->ipaddr.s_addr, pdhcpc->packet.yiaddr, 4);
+      return dhcpc_parseoptions(presult, &pdhcpc->packet.options[4], buflen);
+    }
+  return 0;
+}
+
+/****************************************************************************
+ * Global Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: dhcpc_open
+ ****************************************************************************/
+
+void *dhcpc_open(const void *macaddr, int maclen)
+{
+  struct dhcpc_state_s *pdhcpc;
+  struct sockaddr_in addr;
+  struct timeval tv;
+
+  dbg("MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
+      ((uint8_t*)macaddr)[0], ((uint8_t*)macaddr)[1], ((uint8_t*)macaddr)[2],
+      ((uint8_t*)macaddr)[3], ((uint8_t*)macaddr)[4], ((uint8_t*)macaddr)[5]);
+
+  /* Allocate an internal DHCP structure */
+
+  pdhcpc = (struct dhcpc_state_s *)malloc(sizeof(struct dhcpc_state_s));
+  if (pdhcpc)
+    {
+      /* Initialize the allocated structure */
+
+      memset(pdhcpc, 0, sizeof(struct dhcpc_state_s));
+      pdhcpc->ds_macaddr = macaddr;
+      pdhcpc->ds_maclen  = maclen;
+
+      /* Create a UDP socket */
+
+      pdhcpc->sockfd    = socket(PF_INET, SOCK_DGRAM, 0);
+      if (pdhcpc->sockfd < 0)
+        {
+          free(pdhcpc);
+          return NULL;
+        }
+
+      /* bind the socket */
+
+      addr.sin_family      = AF_INET;
+      addr.sin_port        = HTONS(DHCPC_CLIENT_PORT);
+      addr.sin_addr.s_addr = INADDR_ANY;
+
+      if (bind(pdhcpc->sockfd, (struct sockaddr*)&addr, sizeof(struct sockaddr_in)) < 0)
+        {
+          close(pdhcpc->sockfd);
+          free(pdhcpc);
+          return NULL;
+        }
+
+      /* Configure for read timeouts */
+
+      tv.tv_sec  = 10;
+      tv.tv_usec = 0;
+      if (setsockopt(pdhcpc->sockfd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(struct timeval)) < 0)
+        {
+          close(pdhcpc->sockfd);
+          free(pdhcpc);
+          return NULL;
+        }
+    }
+
+  return (void*)pdhcpc;
+}
+
+/****************************************************************************
+ * Name: dhcpc_close
+ ****************************************************************************/
+
+void dhcpc_close(void *handle)
+{
+  struct dchcpc_state_internal *pdhcpc = (struct dchcpc_state_internal *)handle;
+  if (pdhcpc)
+    {
+      free(pdhcpc);
+    }
+}
+
+/****************************************************************************
+ * Name: dhcpc_request
+ ****************************************************************************/
+
+int dhcpc_request(void *handle, struct dhcpc_state *presult)
+{
+  struct dhcpc_state_s *pdhcpc = (struct dhcpc_state_s *)handle;
+  struct in_addr oldaddr;
+  struct in_addr newaddr;
+  ssize_t result;
+  uint8_t msgtype;
+  int     retries;
+  int     state;
+
+  /* Save the currently assigned IP address (should be INADDR_ANY) */
+
+  oldaddr.s_addr = 0;
+  uip_gethostaddr("eth0", &oldaddr);
+
+  /* Loop until we receive the lease (or an error occurs) */
+
+  do
+    {
+      /* Set the IP address to INADDR_ANY. */
+
+      newaddr.s_addr = INADDR_ANY;
+      (void)uip_sethostaddr("eth0", &newaddr);
+
+      /* Loop sending DISCOVER until we receive an OFFER from a DHCP
+       * server.  We will lock on to the first OFFER and decline any
+       * subsequent offers (which will happen if there are more than one
+       * DHCP servers on the network.
+       */
+
+      state = STATE_INITIAL;
+      do
+        {
+          /* Send the DISCOVER command */
+
+          dbg("Broadcast DISCOVER\n");
+          if (dhcpc_sendmsg(pdhcpc, presult, DHCPDISCOVER) < 0)
+            {
+              return ERROR;
+            }
+
+          /* Get the DHCPOFFER response */
+
+          result = recv(pdhcpc->sockfd, &pdhcpc->packet, sizeof(struct dhcp_msg), 0);
+          if (result >= 0)
+            {
+              msgtype = dhcpc_parsemsg(pdhcpc, result, presult);
+              if (msgtype == DHCPOFFER)
+                {
+                  /* Save the servid from the presult so that it is not clobbered
+                   * by a new OFFER.
+                   */
+
+                  dbg("Received OFFER from %08x\n", ntohl(presult->serverid.s_addr));
+                  pdhcpc->ipaddr.s_addr   = presult->ipaddr.s_addr;
+                  pdhcpc->serverid.s_addr = presult->serverid.s_addr;
+
+                  /* Temporarily use the address offered by the server and break
+                   * out of the loop.
+                   */
+
+                  (void)uip_sethostaddr("eth0", &presult->ipaddr);
+                  state = STATE_HAVE_OFFER;
+                }
+            }
+
+          /* An error has occurred.  If this was a timeout error (meaning that
+           * nothing was received on this socket for a long period of time).
+           * Then loop and send the DISCOVER command again.
+           */
+
+          else if (*get_errno_ptr() != EAGAIN)
+            {
+              /* An error other than a timeout was received -- error out */
+
+              return ERROR;
+            }
+        }
+      while (state == STATE_INITIAL);
+
+
+      /* Loop sending the REQUEST up to three times (if there is no response) */
+
+      retries = 0;
+      do
+        {
+          /* Send the REQUEST message to obtain the lease that was offered to us. */
+
+          dbg("Send REQUEST\n");
+          if (dhcpc_sendmsg(pdhcpc, presult, DHCPREQUEST) < 0)
+            {
+              return ERROR;
+            }
+          retries++;
+
+          /* Get the ACK/NAK response to the REQUEST (or timeout) */
+
+          result = recv(pdhcpc->sockfd, &pdhcpc->packet, sizeof(struct dhcp_msg), 0);
+          if (result >= 0)
+            {
+              /* Parse the response */
+
+              msgtype = dhcpc_parsemsg(pdhcpc, result, presult);
+
+              /* The ACK response means that the server has accepted our request
+               * and we have the lease.
+               */
+
+              if (msgtype == DHCPACK)
+                {
+                  dbg("Received ACK\n");
+                  state = STATE_HAVE_LEASE;
+                }
+
+              /* NAK means the server has refused our request.  Break out of
+               * this loop with state == STATE_HAVE_OFFER and send DISCOVER again
+               */
+
+              else if (msgtype == DHCPNAK)
+                {
+                  dbg("Received NAK\n");
+                  break;
+                }
+
+              /* If we get any OFFERs from other servers, then decline them now
+               * and continue waiting for the ACK from the server that we
+               * requested from.
+               */
+
+              else if (msgtype == DHCPOFFER)
+                {
+                  dbg("Received another OFFER, send DECLINE\n");
+                  (void)dhcpc_sendmsg(pdhcpc, presult, DHCPDECLINE);
+                }
+
+              /* Otherwise, it is something that we do not recognize */
+
+              else
+                {
+                  dbg("Ignoring msgtype=%d\n", msgtype);
+                }
+            }
+
+          /* An error has occurred.  If this was a timeout error (meaning
+           * that nothing was received on this socket for a long period of time).
+           * Then break out and send the DISCOVER command again (at most
+           * 3 times).
+           */
+
+          else if (*get_errno_ptr() != EAGAIN)
+            {
+              /* An error other than a timeout was received */
+
+              (void)uip_sethostaddr("eth0", &oldaddr);
+              return ERROR;
+            }
+        }
+      while (state == STATE_HAVE_OFFER && retries < 3);
+    }
+  while (state != STATE_HAVE_LEASE);
+
+  dbg("Got IP address %d.%d.%d.%d\n",
+      (presult->ipaddr.s_addr >> 24 ) & 0xff,
+      (presult->ipaddr.s_addr >> 16 ) & 0xff,
+      (presult->ipaddr.s_addr >> 8  ) & 0xff,
+      (presult->ipaddr.s_addr       ) & 0xff);
+  dbg("Got netmask %d.%d.%d.%d\n",
+      (presult->netmask.s_addr >> 24 ) & 0xff,
+      (presult->netmask.s_addr >> 16 ) & 0xff,
+      (presult->netmask.s_addr >> 8  ) & 0xff,
+      (presult->netmask.s_addr       ) & 0xff);
+  dbg("Got DNS server %d.%d.%d.%d\n",
+      (presult->dnsaddr.s_addr >> 24 ) & 0xff,
+      (presult->dnsaddr.s_addr >> 16 ) & 0xff,
+      (presult->dnsaddr.s_addr >> 8  ) & 0xff,
+      (presult->dnsaddr.s_addr       ) & 0xff);
+  dbg("Got default router %d.%d.%d.%d\n",
+      (presult->default_router.s_addr >> 24 ) & 0xff,
+      (presult->default_router.s_addr >> 16 ) & 0xff,
+      (presult->default_router.s_addr >> 8  ) & 0xff,
+      (presult->default_router.s_addr       ) & 0xff);
+  dbg("Lease expires in %d seconds\n", presult->lease_time);
+  return OK;
+}