lwip: Add LwIP-based TCP/IP translator

* Makefile (prog-subdirs): Add lwip.
* config.make.in (HAVE_LIBLWIP, liblwip_CFLAGS, liblwip_LIBS): Define
variables.
* configure.ac: Check for liblwip.
* lwip/: New directory.

1 files changed, 113 insertions, 0 deletions

diff --git a/lwip/pfinet-ops.c b/lwip/pfinet-ops.c
new file mode 100644
index 00000000..96d2d12b
--- /dev/null
+++ b/lwip/pfinet-ops.c
@@ -0,0 +1,113 @@
+/*
+   Copyright (C) 2000,02,17 Free Software Foundation, Inc.
+   Written by Marcus Brinkmann.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with the GNU Hurd.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* Operations offered by the stack */
+
+#include <lwip_pfinet_S.h>
+
+#include <string.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <lwip/netif.h>
+#include <sys/mman.h>
+
+#include <lwip-util.h>
+#include <netif/hurdethif.h>
+
+/*
+ * Get all the data requested by SIOCGIFCONF for a particular interface.
+ *
+ * When ifc->ifc_ifreq == NULL, this function is being called for getting
+ * the needed buffer length and not the actual data.
+ */
+static void
+dev_ifconf (struct ifconf *ifc)
+{
+  struct netif *netif;
+  struct ifreq *ifr;
+  struct sockaddr_in *saddr;
+  int len;
+
+  ifr = ifc->ifc_req;
+  len = ifc->ifc_len;
+  saddr = (struct sockaddr_in *) &ifr->ifr_addr;
+  for (netif = netif_list; netif != 0; netif = netif->next)
+    {
+      if (ifc->ifc_req != 0)
+	{
+	  /* Get the data */
+	  if (len < (int) sizeof (struct ifreq))
+	    break;
+
+	  memset (ifr, 0, sizeof (struct ifreq));
+
+	  strncpy (ifr->ifr_name, netif_get_state (netif)->devname,
+		   strlen (netif_get_state (netif)->devname) + 1);
+	  saddr->sin_len = sizeof (struct sockaddr_in);
+	  saddr->sin_family = AF_INET;
+	  saddr->sin_addr.s_addr = netif_ip4_addr (netif)->addr;
+
+	  len -= sizeof (struct ifreq);
+	}
+      /* Update the needed buffer length */
+      ifr++;
+    }
+
+  ifc->ifc_len = (uintptr_t) ifr - (uintptr_t) ifc->ifc_req;
+}
+
+/* Return the list of devices in the format provided by SIOCGIFCONF
+   in IFR, but don't return more then AMOUNT bytes. If AMOUNT is
+   negative, there is no limit.  */
+error_t
+lwip_S_pfinet_siocgifconf (io_t port,
+			   vm_size_t amount,
+			   char **ifr, mach_msg_type_number_t * len)
+{
+  struct ifconf ifc;
+
+  if (amount == (vm_size_t) - 1)
+    {
+      /* Get the needed buffer length */
+      ifc.ifc_buf = 0;
+      ifc.ifc_len = 0;
+      dev_ifconf (&ifc);
+      amount = ifc.ifc_len;
+    }
+  else
+    ifc.ifc_len = amount;
+
+  if (amount > 0)
+    {
+      /* Possibly allocate a new buffer */
+      if (*len < amount)
+	ifc.ifc_buf = (char *) mmap (0, amount, PROT_READ | PROT_WRITE,
+				     MAP_ANON, 0, 0);
+      else
+	ifc.ifc_buf = *ifr;
+
+      dev_ifconf (&ifc);
+    }
+
+  *len = ifc.ifc_len;
+  *ifr = ifc.ifc_buf;
+
+  return 0;
+}