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, 81 insertions, 0 deletions

diff --git a/lwip/options.h b/lwip/options.h
new file mode 100644
index 00000000..e370fab0
--- /dev/null
+++ b/lwip/options.h
@@ -0,0 +1,81 @@
+/*
+   Copyright (C) 1996, 1997, 2000, 2001, 2006, 2007, 2017
+     Free Software Foundation, Inc.
+
+   Written by Miles Bader <miles@gnu.org>
+
+   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/>.
+*/
+
+/* Fsysopts and command line option parsing */
+
+#ifndef OPTIONS_H
+#define OPTIONS_H
+
+#include <stdint.h>
+#include <string.h>
+#include <sys/types.h>
+#include <argp.h>
+
+#include <lwip/ip.h>
+#include <lwip/netif.h>
+
+#define DEV_NAME_LEN    256
+
+/* Used to describe a particular interface during argument parsing.  */
+struct parse_interface
+{
+  /* The network interface in question.  */
+  char dev_name[DEV_NAME_LEN];
+
+  /* New values to apply to it. (IPv4) */
+  ip4_addr_t address, netmask, peer, gateway;
+
+  /* New IPv6 configuration to apply. */
+  uint32_t addr6[LWIP_IPV6_NUM_ADDRESSES][4];
+};
+
+/* Used to hold data during argument parsing.  */
+struct parse_hook
+{
+  /* A list of specified interfaces and their corresponding options.  */
+  struct parse_interface *interfaces;
+  size_t num_interfaces;
+
+  /* Interface to which options apply.  If the device field isn't filled in
+     then it should be by the next --interface option.  */
+  struct parse_interface *curint;
+};
+
+/* Lwip translator options.  Used for both startup and runtime.  */
+static const struct argp_option options[] = {
+  {"interface", 'i', "DEVICE", 0, "Network interface to use", 1},
+  {0, 0, 0, 0, "These apply to a given interface:", 2},
+  {"address", 'a', "ADDRESS", OPTION_ARG_OPTIONAL, "Set the network address"},
+  {"netmask", 'm', "MASK", OPTION_ARG_OPTIONAL, "Set the netmask"},
+  {"gateway", 'g', "ADDRESS", OPTION_ARG_OPTIONAL, "Set the default gateway"},
+  {"ipv4", '4', "NAME", 0, "Put active IPv4 translator on NAME"},
+  {"ipv6", '6', "NAME", 0, "Put active IPv6 translator on NAME"},
+  {"address6", 'A', "ADDR/LEN", OPTION_ARG_OPTIONAL,
+   "Set the global IPv6 address"},
+  {0}
+};
+
+static const char doc[] = "Interface-specific options before the first \
+interface specification apply to the first following interface; otherwise \
+they apply to the previously specified interface.";
+
+#endif // OPTIONS_H