Update mud

2016-03-30 14:36:52 +00:00
43 changed files with 1090 additions and 2032 deletions
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,24 +0,0 @@
-name: Build
-
-on: [push]
-
-jobs:
-  build:
-
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest, macOS-latest]
-
-    steps:
-    - uses: actions/checkout@v1
-    - name: Build glorytun
-      run: |
-          git submodule update --init --recursive
-          ./sodium.sh
-          make prefix=. install
-
-    - uses: actions/upload-artifact@v1
-      with:
-        name: ${{ matrix.os }}
-        path: ./bin
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
-*.[ios]
+*.o
 *.log
 *.scan
 *.cache
@@ -10,7 +10,4 @@ configure
 build-aux
 .deps
 .dirstamp
-.static
 glorytun
-build*
-VERSION
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,8 +1,3 @@
 [submodule "mud"]
 	path = mud
 	url = https://github.com/angt/mud.git
-	ignore = dirty
-[submodule "argz"]
-	path = argz
-	url = https://github.com/angt/argz.git
-	ignore = dirty
--- a/2
+++ b/2
@@ -1,4 +1,4 @@
-Copyright (c) 2015-2020, Adrien Gallouët <adrien@gallouet.fr>
+Copyright (c) 2015-2016, angt
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
--- a/34
+++ b/34
@@ -1,34 +0,0 @@
-NAME    := glorytun
-VERSION := $(shell ./version.sh)
-DIST    := $(NAME)-$(VERSION)
-
-CC      ?= cc
-DESTDIR ?=
-prefix  ?= /usr
-Q       := @
-
-CFLAGS := -std=c11 -O2 -Wall -fstack-protector-strong
-
-FLAGS := $(CFLAGS) $(LDFLAGS) $(CPPFLAGS)
-FLAGS += -DPACKAGE_NAME=\"$(NAME)\" -DPACKAGE_VERSION=\"$(VERSION)\"
-
-FLAGS += -I.static/$(CROSS)/libsodium-stable/src/libsodium/include
-FLAGS += -L.static/$(CROSS)/libsodium-stable/src/libsodium/.libs
-
-SRC := argz/argz.c mud/mud.c mud/aegis256/aegis256.c $(wildcard src/*.c)
-HDR := argz/argz.h mud/mud.h mud/aegis256/aegis256.h $(wildcard src/*.h)
-
-$(NAME): $(SRC) $(HDR)
-	@echo "$(NAME)"
-	$(Q)$(CC) $(FLAGS) -o $(NAME) $(SRC) -lsodium
-
-.PHONY: install
-install: $(NAME)
-	@echo "$(DESTDIR)$(prefix)/bin/$(NAME)"
-	$(Q)install -m 755 -d $(DESTDIR)$(prefix)/bin
-	$(Q)install -m 755 -s $(NAME) $(DESTDIR)$(prefix)/bin
-
-.PHONY: clean
-clean:
-	$(Q)rm -f "$(NAME)"
-	$(Q)rm -f "$(DIST).tar.gz"
--- a/Makefile.am
+++ b/Makefile.am
@@ -5,39 +5,29 @@ bin_PROGRAMS = glorytun
 glorytun_CFLAGS = $(libsodium_CFLAGS)
 glorytun_LDADD = $(libsodium_LIBS)
 glorytun_SOURCES = \
-    argz/argz.c \
-    argz/argz.h \
-    mud/mud.c \
-    mud/mud.h \
-    mud/aegis256/aegis256.c \
-    mud/aegis256/aegis256.h \
-    src/bench.c \
-    src/bind.c \
-    src/common.c \
    src/common.h \
-    src/ctl.c \
-    src/ctl.h \
-    src/iface.c \
-    src/iface.h \
+    src/common.c \
+    src/buffer.h \
    src/ip.h \
-    src/keygen.c \
-    src/main.c \
-    src/path.c \
-    src/set.c \
-    src/show.c \
    src/str.h \
+    src/main.c \
+    src/option.c \
+    src/option.h \
    src/tun.c \
-    src/tun.h
+    src/tun.h \
+    src/db.c \
+    src/db.h \
+    src/state.c \
+    src/state.h
+
+glorytun_CFLAGS  += -I$(srcdir)/mud
+glorytun_SOURCES += \
+    mud/mud.h \
+    mud/mud.c

 EXTRA_DIST = \
    LICENSE \
-    Makefile \
    README.md \
    VERSION \
    autogen.sh \
-    meson.build \
-    mud/LICENSE \
-    mud/README.md \
-    sodium.sh \
-    systemd \
    version.sh
--- a/README.md
+++ b/README.md
@@ -1,53 +1,23 @@
-# Glorytun
+# π₁(Glorytun)=ℤ²

-Glorytun is a small, simple and secure VPN over [mud](https://github.com/angt/mud).
+Small, Simple and Stupid VPN over [mud](https://github.com/angt/mud).

-Please visit the [wiki](https://github.com/angt/glorytun/wiki) for how-to guides, tutorials, etc.
+#### Work In Progress

-## Compatibility
+This code will probably format your harddisk!

-Glorytun only depends on [libsodium](https://github.com/jedisct1/libsodium) version >= 1.0.4.
-Which can be installed on a wide variety of systems.
+#### Build and Install

-Linux is the platform of choice but the code is standard so it should be easily ported on other posix systems.
-It was successfully tested on OpenBSD, FreeBSD and MacOS.
+Glorytun depends on [libsodium](https://github.com/jedisct1/libsodium) version >= 1.0.4
+and needs an AES-NI capable CPU.

-IPv4 and IPv6 are supported.
-On Linux you can have both at the same time by binding `::`.
+To build and install the latest version:

-## Features
-
-The key features of Glorytun come directly from mud:
-
- * **Fast and highly secure**
-
-   Glorytun uses a new and very fast AEAD construction called AEGIS-256 if AES-NI is available otherwise ChaCha20-Poly1305 is used.
-   Of course, you can force the use of ChaCha20-Poly1305 for higher security.
-   All messages are encrypted, authenticated and timestamped to mitigate a large set of attacks.
-   This implies that the client and the server must be synchronized, an offset of 10min is accepted by default.
-   Perfect forward secrecy is also implemented with ECDH over Curve25519. Keys are rotated every hours.
-
- * **Multipath and failover**
-
-   Connectivity is now crucial, especially in the SD-WAN world.
-   This feature allows a TCP connection (and all other protocols) to explore and exploit all available links without being disconnected.
-   Aggregation should work on all conventional links.
-   Only very high latency (+500ms) links are not recommended for now.
-   Backup paths are also supported, they will be used only in case of emergency, it is useful when aggregation is not your priority.
-
- * **Traffic shaping**
-
-   Shaping is very important in network, it allows to keep a low latency without sacrificing the bandwidth.
-   It also helps the multipath scheduler to make better decisions.
-   Currently it must be configured by hand, but soon Glorytun will do it for you.
-
- * **Path MTU discovery without ICMP**
-
-   Bad MTU configuration is a very common problem in the world of VPN.
-   As it is critical, Glorytun will try to setup it correctly by guessing its value.
-   It doesn't rely on Next-hop MTU to avoid ICMP black holes.
-   In asymmetric situations the minimum MTU is selected.
-
---
+    $ git clone https://github.com/angt/glorytun --recursive --branch mud
+    $ cd glorytun
+    $ ./autogen.sh
+    $ ./configure
+    $ make
+    # make install

 For feature requests and bug reports, please create an [issue](https://github.com/angt/glorytun/issues).
--- a/1
+++ b/1
--- a/configure.ac
+++ b/configure.ac
@@ -4,18 +4,18 @@ AC_INIT([glorytun],
        [https://github.com/angt/glorytun/issues],
        [glorytun],
        [https://github.com/angt/glorytun])
+AC_DEFINE_UNQUOTED([VERSION_MAJOR], [m4_esyscmd([./version.sh major])])
 AC_CONFIG_SRCDIR([src/common.h])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
-AM_INIT_AUTOMAKE([1.12 -Wall -Werror foreign tar-ustar subdir-objects])
+AM_INIT_AUTOMAKE([1.9 -Wall -Werror foreign tar-ustar subdir-objects])
 AM_DEP_TRACK
 AM_SILENT_RULES([yes])
 AM_PROG_CC_C_O
 AC_PROG_CC_C99
 AC_USE_SYSTEM_EXTENSIONS
+AC_SEARCH_LIBS([getaddrinfo], [resolv nsl])
 AC_SEARCH_LIBS([socket], [socket])
-AC_CHECK_LIB([rt], [clock_gettime])
-AC_CHECK_FUNCS([clock_gettime])
 PKG_CHECK_MODULES([libsodium], [libsodium >= 1.0.4])
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT
--- a/m4/pkg.m4
+++ b/m4/pkg.m4
@@ -1,6 +1,6 @@
-# pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
-# serial 12 (pkg-config-0.29.2)
-
+dnl pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
+dnl serial 11 (pkg-config-0.29)
+dnl
 dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
 dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
 dnl
@@ -41,7 +41,7 @@ dnl
 dnl See the "Since" comment for each macro you use to see what version
 dnl of the macros you require.
 m4_defun([PKG_PREREQ],
-[m4_define([PKG_MACROS_VERSION], [0.29.2])
+[m4_define([PKG_MACROS_VERSION], [0.29])
 m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
    [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
 ])dnl PKG_PREREQ
@@ -142,7 +142,7 @@ AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
 AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl

 pkg_failed=no
-AC_MSG_CHECKING([for $2])
+AC_MSG_CHECKING([for $1])

 _PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
 _PKG_CONFIG([$1][_LIBS], [libs], [$2])
@@ -152,11 +152,11 @@ and $1[]_LIBS to avoid the need to call pkg-config.
 See the pkg-config man page for more details.])

 if test $pkg_failed = yes; then
-        AC_MSG_RESULT([no])
+   	AC_MSG_RESULT([no])
        _PKG_SHORT_ERRORS_SUPPORTED
        if test $_pkg_short_errors_supported = yes; then
 	        $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
-        else
+        else 
 	        $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1`
        fi
 	# Put the nasty error message in config.log where it belongs
@@ -173,7 +173,7 @@ installed software in a non-standard prefix.
 _PKG_TEXT])[]dnl
        ])
 elif test $pkg_failed = untried; then
-        AC_MSG_RESULT([no])
+     	AC_MSG_RESULT([no])
 	m4_default([$4], [AC_MSG_FAILURE(
 [The pkg-config script could not be found or is too old.  Make sure it
 is in your PATH or set the PKG_CONFIG environment variable to the full
--- a/meson.build
+++ b/meson.build
@@ -1,62 +0,0 @@
-project('glorytun', 'c',
-    version: run_command('./version.sh').stdout(),
-    license: 'BSD-3-Clause',
-    default_options : [
-      'buildtype=debugoptimized',
-      'c_std=gnu99'
-    ]
-)
-
-cc = meson.get_compiler('c')
-
-prefix = get_option('prefix')
-bindir = join_paths(prefix, get_option('bindir'))
-
-conf_data = configuration_data()
-conf_data.set('prefix', prefix)
-conf_data.set('bindir', bindir)
-
-add_global_arguments('-DPACKAGE_VERSION="'+meson.project_version()+'"', language : 'c')
-add_global_arguments('-DPACKAGE_NAME="'+meson.project_name()+'"', language : 'c')
-
-executable('glorytun', install: true,
-  sources: [
-    'argz/argz.c',
-    'mud/mud.c',
-    'mud/aegis256/aegis256.c',
-    'src/bench.c',
-    'src/bind.c',
-    'src/common.c',
-    'src/ctl.c',
-    'src/iface.c',
-    'src/keygen.c',
-    'src/main.c',
-    'src/path.c',
-    'src/set.c',
-    'src/show.c',
-    'src/tun.c',
-  ],
-  dependencies: [
-    dependency('libsodium', version : '>=1.0.4'),
-  ]
-)
-
-systemd = dependency('systemd', required: false)
-
-if systemd.found()
-  systemdutildir = systemd.get_pkgconfig_variable('systemdutildir')
-  configure_file(
-      input: 'systemd/glorytun@.service.in',
-      output: 'glorytun@.service',
-      configuration: conf_data,
-      install_dir: join_paths(systemdutildir, 'system')
-  )
-  install_data('systemd/glorytun.network',
-      install_dir: join_paths(systemdutildir, 'network'))
-  install_data('systemd/glorytun-client.network',
-      install_dir: join_paths(systemdutildir, 'network'))
-  install_data('systemd/glorytun-run',
-      install_dir: bindir)
-  install_data('systemd/glorytun-setup',
-      install_dir: bindir)
-endif
--- a/2
+++ b/2
--- a/sodium.sh
+++ b/sodium.sh
@@ -1,29 +0,0 @@
-#!/bin/sh
-
-mkdir -p .static
-cd .static || exit 1
-
-file=LATEST.tar.gz
-url=https://download.libsodium.org/libsodium/releases
-dir="$PWD"
-
-[ -f "$file" ] || wget -q     "$url/$file" -O "$file"
-[ -f "$file" ] || curl -SsfLO "$url/$file"
-[ -f "$file" ] || {
-	echo "Couldn't download $url/$file"
-	exit 1
-}
-
-if [ "$1" ]; then
-	mkdir -p "$1"
-	cd "$1" || exit 1
-fi
-
-rm -rf libsodium-stable
-tar zxf "$dir/$file"
-cd libsodium-stable || exit 1
-
-NPROC=$(sysctl -n hw.ncpu || nproc) 2>/dev/null
-
-./configure ${1+--host=$1} --enable-minimal --disable-dependency-tracking --enable-static --disable-shared
-make "-j$((NPROC+1))"
--- a/src/bench.c
+++ b/src/bench.c
@@ -1,118 +0,0 @@
-#include "common.h"
-
-#include <sodium.h>
-#include <string.h>
-#include <stdio.h>
-#include <time.h>
-#include <unistd.h>
-#include <inttypes.h>
-
-#include "../argz/argz.h"
-#include "../mud/aegis256/aegis256.h"
-
-#define NPUBBYTES 32
-#define KEYBYTES  32
-#define ABYTES    16
-
-int
-gt_bench(int argc, char **argv)
-{
-    struct argz bench_argz[] = {
-        {"aes|chacha", NULL, NULL, argz_option},
-        {NULL}};
-
-    if (argz(bench_argz, argc, argv))
-        return 1;
-
-    if (sodium_init() == -1) {
-        gt_log("sodium init failed\n");
-        return 1;
-    }
-
-    int term = isatty(1);
-    int aes = argz_is_set(bench_argz, "aes");
-    int chacha = argz_is_set(bench_argz, "chacha");
-
-    if (!aegis256_is_available()) {
-        if (aes) {
-            gt_log("aes is not available on your platform\n");
-            return 1;
-        }
-        chacha = 1;
-    }
-
-    unsigned char buf[1450 + ABYTES];
-    unsigned char npub[NPUBBYTES];
-    unsigned char key[KEYBYTES];
-
-    memset(buf, 0, sizeof(buf));
-    randombytes_buf(npub, sizeof(npub));
-    randombytes_buf(key, sizeof(key));
-
-    if (term) {
-        printf("cipher: %s\n\n", GT_CIPHER(chacha));
-        printf("  size       min           mean            max      \n");
-        printf("----------------------------------------------------\n");
-    }
-
-    int64_t size = 20;
-
-    for (int i = 0; !gt_quit && size <= 1450; i++) {
-        struct {
-            int64_t min, mean, max, n;
-        } mbps = { .n = 0 };
-
-        int64_t bytes_max = (int64_t)1 << 24;
-
-        while (!gt_quit && mbps.n < 10) {
-            int64_t bytes = 0;
-            int64_t base = (int64_t)clock();
-
-            while (!gt_quit && bytes <= bytes_max) {
-                if (chacha) {
-                    crypto_aead_chacha20poly1305_encrypt(
-                            buf, NULL, buf, size, NULL, 0, NULL, npub, key);
-                } else {
-                    aegis256_encrypt(buf, NULL, buf, size, NULL, 0, npub, key);
-                }
-                bytes += size;
-            }
-
-            int64_t dt = (int64_t)clock() - base;
-            bytes_max = (bytes * (CLOCKS_PER_SEC / 3)) / dt;
-            int64_t _mbps = (8 * bytes * CLOCKS_PER_SEC) / (dt * 1000 * 1000);
-
-            if (!mbps.n++) {
-                mbps.min = _mbps;
-                mbps.max = _mbps;
-                mbps.mean = _mbps;
-                continue;
-            }
-
-            if (mbps.min > _mbps)
-                mbps.min = _mbps;
-
-            if (mbps.max < _mbps)
-                mbps.max = _mbps;
-
-            mbps.mean += (_mbps - mbps.mean) / mbps.n;
-
-            if (term) {
-                printf("\r %5"PRIi64" %9"PRIi64" Mbps %9"PRIi64" Mbps %9"PRIi64" Mbps",
-                        size, mbps.min, mbps.mean, mbps.max);
-                fflush(stdout);
-            }
-        }
-
-        if (term) {
-            printf("\n");
-        } else {
-            printf("bench %s %"PRIi64" %"PRIi64" %"PRIi64" %"PRIi64"\n",
-                    GT_CIPHER(chacha), size, mbps.min, mbps.mean, mbps.max);
-        }
-
-        size += 2 * 5 * 13;
-    }
-
-    return 0;
-}
--- a/src/bind.c
+++ b/src/bind.c
@@ -1,367 +0,0 @@
-#include "common.h"
-#include "ctl.h"
-#include "iface.h"
-#include "ip.h"
-#include "str.h"
-#include "tun.h"
-
-#include <fcntl.h>
-#include <stdio.h>
-#include <sys/select.h>
-
-#include "../argz/argz.h"
-#include "../mud/mud.h"
-
-#include <sodium.h>
-
-#ifndef O_CLOEXEC
-#define O_CLOEXEC 0
-#endif
-
-static int
-fd_set_nonblock(int fd)
-{
-    if (fd == -1)
-        return 0;
-
-    int ret;
-
-    do {
-        ret = fcntl(fd, F_GETFL, 0);
-    } while (ret == -1 && errno == EINTR);
-
-    int flags = (ret == -1) ? 0 : ret;
-
-    do {
-        ret = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
-    } while (ret == -1 && errno == EINTR);
-
-    return ret;
-}
-
-static int
-gt_setup_secretkey(struct mud *mud, const char *keyfile)
-{
-    int fd;
-
-    do {
-        fd = open(keyfile, O_RDONLY | O_CLOEXEC);
-    } while (fd == -1 && errno == EINTR);
-
-    if (fd == -1) {
-        gt_log("couldn't open %s: %s\n", keyfile, strerror(errno));
-        return -1;
-    }
-
-    unsigned char key[32];
-    char buf[2 * sizeof(key)];
-    size_t size = 0;
-
-    while (size < sizeof(buf)) {
-        ssize_t r = read(fd, &buf[size], sizeof(buf) - size);
-
-        if (r <= (ssize_t)0) {
-            if (r && (errno == EAGAIN || errno == EINTR))
-                continue;
-            break;
-        }
-
-        size += (size_t)r;
-    }
-
-    close(fd);
-
-    if (size != sizeof(buf)) {
-        gt_log("couldn't read secret key\n");
-        return -1;
-    }
-
-    if (gt_fromhex(key, sizeof(key), buf, sizeof(buf))) {
-        gt_log("secret key is not valid\n");
-        return -1;
-    }
-
-    mud_set_key(mud, key, sizeof(key));
-
-    return 0;
-}
-
-static size_t
-gt_setup_mtu(struct mud *mud, size_t old, const char *tun_name)
-{
-    size_t mtu = mud_get_mtu(mud);
-
-    if (!mtu || mtu == old)
-        return mtu;
-
-    if (iface_set_mtu(tun_name, mtu) == -1)
-        gt_log("couldn't setup MTU at %zu on device %s\n", mtu, tun_name);
-
-    return mtu;
-}
-
-int
-gt_bind(int argc, char **argv)
-{
-    struct sockaddr_storage bind_addr = { .ss_family = AF_INET };
-    struct sockaddr_storage peer_addr = { 0 };
-    unsigned short bind_port = 5000;
-    unsigned short peer_port = bind_port;
-    const char *dev = NULL;
-    const char *keyfile = NULL;
-
-    struct argz toz[] = {
-        {NULL, "IPADDR", &peer_addr, argz_addr},
-        {NULL, "PORT", &peer_port, argz_ushort},
-        {NULL}};
-
-    struct argz bindz[] = {
-        {NULL, "IPADDR", &bind_addr, argz_addr},
-        {NULL, "PORT", &bind_port, argz_ushort},
-        {"to", NULL, &toz, argz_option},
-        {"dev", "NAME", &dev, argz_str},
-        {"keyfile", "FILE", &keyfile, argz_str},
-        {"chacha", NULL, NULL, argz_option},
-        {"persist", NULL, NULL, argz_option},
-        {NULL}};
-
-    if (argz(bindz, argc, argv))
-        return 1;
-
-    if (str_empty(keyfile)) {
-        gt_log("a keyfile is needed!\n");
-        return 1;
-    }
-
-    gt_set_port((struct sockaddr *)&bind_addr, bind_port);
-    gt_set_port((struct sockaddr *)&peer_addr, peer_port);
-
-    int chacha = argz_is_set(bindz, "chacha");
-    int persist = argz_is_set(bindz, "persist");
-
-    if (sodium_init() == -1) {
-        gt_log("couldn't init sodium\n");
-        return 1;
-    }
-
-    unsigned char hashkey[crypto_shorthash_KEYBYTES];
-    randombytes_buf(hashkey, sizeof(hashkey));
-
-    struct mud *mud = mud_create((struct sockaddr *)&bind_addr);
-    const int mud_fd = mud_get_fd(mud);
-
-    if (mud_fd == -1) {
-        gt_log("couldn't create mud\n");
-        return 1;
-    }
-
-    if (gt_setup_secretkey(mud, keyfile))
-        return 1;
-
-    if (!chacha && mud_set_aes(mud)) {
-        gt_log("AES is not available, enjoy ChaCha20!\n");
-        chacha = 1;
-    }
-
-    char tun_name[64];
-    const int tun_fd = tun_create(tun_name, sizeof(tun_name), dev);
-
-    if (tun_fd == -1) {
-        gt_log("couldn't create tun device\n");
-        return 1;
-    }
-
-    size_t mtu = gt_setup_mtu(mud, 0, tun_name);
-
-    if (tun_set_persist(tun_fd, persist) == -1) {
-        gt_log("couldn't %sable persist mode on device %s\n",
-                persist ? "en" : "dis", tun_name);
-    }
-
-    if (peer_addr.ss_family) {
-        if (mud_peer(mud, (struct sockaddr *)&peer_addr)) {
-            perror("mud_peer");
-            return 1;
-        }
-    }
-
-    const int ctl_fd = ctl_create(tun_name);
-
-    if (ctl_fd == -1) {
-        char dir[64];
-        if (ctl_rundir(dir, sizeof(dir))) {
-            gt_log("couldn't create %s/%s: %s\n",
-                    dir, tun_name, strerror(errno));
-        } else {
-            gt_log("couldn't find a writable run/tmp directory\n");
-        }
-        return 1;
-    }
-
-    if (//fd_set_nonblock(tun_fd) ||
-        //fd_set_nonblock(mud_fd) ||
-        fd_set_nonblock(ctl_fd)) {
-        gt_log("couldn't setup non-blocking fds\n");
-        return 1;
-    }
-
-    const long pid = (long)getpid();
-
-    gt_log("running on device %s as pid %li\n", tun_name, pid);
-
-    fd_set rfds, wfds;
-    FD_ZERO(&rfds);
-    FD_ZERO(&wfds);
-
-    int tun_can_read = 0;
-    int tun_can_write = 0;
-    int mud_can_read = 0;
-    int mud_can_write = 0;
-
-    int last_fd = MAX(tun_fd, mud_fd);
-    last_fd = 1 + MAX(last_fd, ctl_fd);
-
-    __attribute__((aligned(16)))
-        unsigned char buf[1500];
-
-    while (!gt_quit) {
-        if (tun_can_write) FD_CLR(tun_fd, &wfds); else FD_SET(tun_fd, &wfds);
-        if (mud_can_write) FD_CLR(mud_fd, &wfds); else FD_SET(mud_fd, &wfds);
-        if (tun_can_read)  FD_CLR(tun_fd, &rfds); else FD_SET(tun_fd, &rfds);
-        if (mud_can_read)  FD_CLR(mud_fd, &rfds); else FD_SET(mud_fd, &rfds);
-
-        FD_SET(ctl_fd, &rfds);
-
-        struct timeval tv = { 0 };
-        int update = mud_update(mud);
-
-        if (update >= 0) {
-            if (mud_can_read && tun_can_write) {
-            } else if (tun_can_read && mud_can_write) {
-                if (update)
-                    tv.tv_usec = 1000;
-            } else {
-                tv.tv_usec = 100000;
-            }
-        }
-
-        const int ret = select(last_fd, &rfds, &wfds, NULL, update < 0 ? NULL : &tv);
-
-        if (ret == -1) {
-            if (errno == EBADF) {
-                perror("select");
-                break;
-            }
-            continue;
-        }
-
-        if (FD_ISSET(tun_fd, &rfds)) tun_can_read  = 1;
-        if (FD_ISSET(tun_fd, &wfds)) tun_can_write = 1;
-        if (FD_ISSET(mud_fd, &rfds)) mud_can_read  = 1;
-        if (FD_ISSET(mud_fd, &wfds)) mud_can_write = 1;
-
-        mtu = gt_setup_mtu(mud, mtu, tun_name);
-
-        if (tun_can_read && mud_can_write && !mud_send_wait(mud)) {
-            struct ip_common ic;
-            int r = tun_read(tun_fd, buf, sizeof(buf));
-
-            if (r > 0 && !ip_get_common(&ic, buf, r)) {
-                mud_send(mud, buf, (size_t)r);
-                mud_can_write = 0;
-            }
-
-            tun_can_read = 0;
-        }
-
-        if (mud_can_read && tun_can_write)  {
-            int r = mud_recv(mud, buf, sizeof(buf));
-
-            if (r > 0 && ip_is_valid(buf, r)) {
-                tun_write(tun_fd, buf, (size_t)r);
-                tun_can_write = 0;
-            }
-
-            mud_can_read = 0;
-        }
-
-        if (FD_ISSET(ctl_fd, &rfds)) {
-            struct ctl_msg req, res = {.reply = 1};
-            struct sockaddr_storage ss;
-            socklen_t sl = sizeof(ss);
-
-            ssize_t r = recvfrom(ctl_fd, &req, sizeof(req), 0,
-                                 (struct sockaddr *)&ss, &sl);
-
-            if (r == (ssize_t)sizeof(req)) {
-                res.type = req.type;
-
-                switch (req.type) {
-                case CTL_NONE:
-                    break;
-                case CTL_STATE:
-                    if (mud_set_state(mud, (struct sockaddr *)&req.path.addr,
-                                      req.path.state,
-                                      req.path.rate_tx,
-                                      req.path.rate_rx,
-                                      req.path.beat,
-                                      req.path.fixed_rate))
-                        res.ret = errno;
-                    break;
-                case CTL_CONF:
-                    if (mud_set_conf(mud, &req.conf))
-                        res.ret = errno;
-                    break;
-                case CTL_STATUS:
-                    memcpy(res.status.tun_name, tun_name, sizeof(tun_name)); // XXX
-                    res.status.pid = pid;
-                    res.status.mtu = mtu;
-                    res.status.chacha = chacha;
-                    res.status.bind = bind_addr;
-                    res.status.peer = peer_addr;
-                    break;
-                case CTL_PATH_STATUS:
-                    {
-                        unsigned count = 0;
-                        struct mud_path *paths = mud_get_paths(mud, &count);
-
-                        if (!paths) {
-                            res.ret = errno;
-                            break;
-                        }
-
-                        res.ret = EAGAIN;
-
-                        for (unsigned i = 0; i < count; i++) {
-                            memcpy(&res.path_status, &paths[i], sizeof(struct mud_path));
-                            if (sendto(ctl_fd, &res, sizeof(res), 0,
-                                       (const struct sockaddr *)&ss, sl) == -1)
-                                perror("sendto(ctl)");
-                        }
-
-                        free(paths);
-                        res.ret = 0;
-                    }
-                    break;
-                case CTL_BAD:
-                    if (mud_get_bad(mud, &res.bad))
-                        res.ret = errno;
-                    break;
-                }
-                if (sendto(ctl_fd, &res, sizeof(res), 0,
-                           (const struct sockaddr *)&ss, sl) == -1)
-                    perror("sendto(ctl)");
-            } else if (r == -1 && errno != EAGAIN) {
-                perror("recvfrom(ctl)");
-            }
-        }
-    }
-
-    if (gt_reload && tun_fd >= 0)
-        tun_set_persist(tun_fd, 1);
-
-    mud_delete(mud);
-    ctl_delete(ctl_fd);
-
-    return 0;
-}
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -0,0 +1,66 @@
+#pragma once
+
+#include "common.h"
+
+typedef struct buffer buffer_t;
+
+struct buffer {
+    uint8_t *data;
+    uint8_t *read;
+    uint8_t *write;
+    uint8_t *end;
+};
+
+static inline void buffer_setup (buffer_t *buffer, void *data, size_t size)
+{
+    if (!data)
+        data = malloc(ALIGN(size));
+
+    buffer->data  = data;
+    buffer->read  = data;
+    buffer->write = data;
+    buffer->end   = data;
+    buffer->end  += size;
+}
+
+static inline void buffer_format (buffer_t *buffer)
+{
+    buffer->write = buffer->data;
+    buffer->read  = buffer->data;
+}
+
+_pure_
+static inline size_t buffer_size (buffer_t *buffer)
+{
+    return buffer->end-buffer->data;
+}
+
+_pure_
+static inline size_t buffer_write_size (buffer_t *buffer)
+{
+    return buffer->end-buffer->write;
+}
+
+_pure_
+static inline size_t buffer_read_size (buffer_t *buffer)
+{
+    return buffer->write-buffer->read;
+}
+
+static inline void buffer_shift (buffer_t *buffer)
+{
+    if (buffer->read==buffer->data)
+        return;
+
+    if (buffer->read==buffer->write) {
+        buffer_format(buffer);
+        return;
+    }
+
+    const size_t size = buffer_read_size(buffer);
+
+    memmove(buffer->data, buffer->read, size);
+
+    buffer->read  = buffer->data;
+    buffer->write = buffer->data+size;
+}
--- a/src/common.c
+++ b/src/common.c
@@ -1,10 +1,22 @@
 #include "common.h"

-#include <stdarg.h>
 #include <stdio.h>
+#include <stdarg.h>

-void
-gt_log(const char *fmt, ...)
+int gt_print (const char *fmt, ...)
+{
+    va_list ap;
+    va_start(ap, fmt);
+    int ret = vfprintf(stdout, fmt, ap);
+    va_end(ap);
+
+    if (ret<0)
+        return 0;
+
+    return ret;
+}
+
+void gt_log (const char *fmt, ...)
 {
    va_list ap;
    va_start(ap, fmt);
@@ -12,20 +24,34 @@ gt_log(const char *fmt, ...)
    va_end(ap);
 }

-int
-gt_tohex(char *dst, size_t dst_size, const uint8_t *src, size_t src_size)
+void gt_fatal (const char *fmt, ...)
 {
-    if (_0_(!dst_size))
+    va_list ap;
+    va_start(ap, fmt);
+    vfprintf(stderr, fmt, ap);
+    va_end(ap);
+
+    exit(EXIT_FAILURE);
+}
+
+void gt_na (const char *name)
+{
+    gt_log("%s is not available on your platform\n", name);
+}
+
+int gt_tohex (char *dst, size_t dst_size, const uint8_t *src, size_t src_size)
+{
+    if _0_(!dst_size)
        return -1;

-    if (_0_(((dst_size - 1) / 2) < src_size))
+    if _0_(((dst_size-1)/2)<src_size)
        return -1;

    static const char tbl[] = "0123456789ABCDEF";

-    for (size_t i = 0; i < src_size; i++) {
-        *dst++ = tbl[0xF & (src[i] >> 4)];
-        *dst++ = tbl[0xF & (src[i])];
+    for (size_t i=0; i<src_size; i++) {
+        *dst++ = tbl[0xF&(src[i]>>4)];
+        *dst++ = tbl[0xF&(src[i])];
    }

    *dst = 0;
@@ -33,84 +59,38 @@ gt_tohex(char *dst, size_t dst_size, const uint8_t *src, size_t src_size)
    return 0;
 }

-_const_ static inline int
-fromhex(const char c)
+_const_
+static inline int fromhex (const char c)
 {
-    if (c >= '0' && c <= '9')
-        return c - '0';
+    if (c>='0' && c<='9')
+        return c-'0';

-    if (c >= 'A' && c <= 'F')
-        return c - 'A' + 10;
+    if (c>='A' && c<='F')
+        return c-'A'+10;

-    if (c >= 'a' && c <= 'f')
-        return c - 'a' + 10;
+    if (c>='a' && c<='f')
+        return c-'a'+10;

    return -1;
 }

-int
-gt_fromhex(uint8_t *dst, size_t dst_size, const char *src, size_t src_size)
+int gt_fromhex (uint8_t *dst, size_t dst_size, const char *src, size_t src_size)
 {
-    if (_0_(src_size & 1))
+    if _0_(src_size&1)
        return -1;

-    if (_0_(dst_size < (src_size / 2)))
+    if _0_(dst_size<(src_size/2))
        return -1;

-    for (size_t i = 0; i < src_size; i += 2) {
+    for (size_t i=0; i<src_size; i+=2) {
        const int a = fromhex(src[i]);
-        const int b = fromhex(src[i + 1]);
+        const int b = fromhex(src[i+1]);

-        if (_0_(a == -1 || b == -1))
+        if _0_(a==-1 || b==-1)
            return -1;

-        *dst++ = (uint8_t)((a << 4) | b);
+        *dst++ = (a<<4)|b;
    }

    return 0;
 }
-
-void
-gt_set_port(struct sockaddr *sa, uint16_t port)
-{
-    switch (sa->sa_family) {
-    case AF_INET:
-        ((struct sockaddr_in *)sa)->sin_port = htons(port);
-        break;
-    case AF_INET6:
-        ((struct sockaddr_in6 *)sa)->sin6_port = htons(port);
-        break;
-    }
-}
-
-uint16_t
-gt_get_port(struct sockaddr *sa)
-{
-    switch (sa->sa_family) {
-    case AF_INET:
-        return ntohs(((struct sockaddr_in *)sa)->sin_port);
-    case AF_INET6:
-        return ntohs(((struct sockaddr_in6 *)sa)->sin6_port);
-    }
-
-    return 0;
-}
-
-int
-gt_toaddr(char *str, size_t size, struct sockaddr *sa)
-{
-    if (str)
-        str[0] = 0;
-
-    switch (sa->sa_family) {
-    case AF_INET:
-        return -!inet_ntop(AF_INET,
-                &((struct sockaddr_in *)sa)->sin_addr, str, (socklen_t)size);
-    case AF_INET6:
-        return -!inet_ntop(AF_INET6,
-                &((struct sockaddr_in6 *)sa)->sin6_addr, str, (socklen_t)size);
-    }
-
-    errno = EAFNOSUPPORT;
-    return -1;
-}
--- a/src/common.h
+++ b/src/common.h
@@ -1,26 +1,11 @@
 #pragma once

-#if defined __linux__ && !defined _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include <stdlib.h>
 #include <stdint.h>
 #include <string.h>
 #include <unistd.h>
-#include <signal.h>
 #include <errno.h>

-#include <arpa/inet.h>
-
-#ifndef PACKAGE_NAME
-#define PACKAGE_NAME "glorytun"
-#endif
-
-#ifndef PACKAGE_VERSION
-#define PACKAGE_VERSION "0.0.0"
-#endif
-
 #define COUNT(x)       (sizeof(x)/sizeof(x[0]))

 #define ALIGN_SIZE     (1<<4)
@@ -44,31 +29,10 @@
 #define _const_        __attribute__ ((const))
 #define _align_(...)   __attribute__ ((aligned(__VA_ARGS__)))

-#undef MAX
-#define MAX(x,y) ({ __typeof__(x) X=(x); __typeof__(y) Y=(y); X > Y ? X : Y; })
-
-#undef MIN
-#define MIN(x,y) ({ __typeof__(x) X=(x); __typeof__(y) Y=(y); X < Y ? X : Y; })
-
-#define GT_CIPHER(x)  ((x) ? "chacha20poly1305" : "aegis256")
-
-extern volatile sig_atomic_t gt_alarm;
-extern volatile sig_atomic_t gt_reload;
-extern volatile sig_atomic_t gt_quit;
-
 int  gt_print (const char *, ...) _printf_(1,2);
 void gt_log   (const char *, ...) _printf_(1,2);
+void gt_fatal (const char *, ...) _printf_(1,2) _noreturn_;
+void gt_na    (const char *);

 int gt_tohex   (char *, size_t, const uint8_t *, size_t);
 int gt_fromhex (uint8_t *, size_t, const char *, size_t);
-
-void     gt_set_port (struct sockaddr *, uint16_t);
-uint16_t gt_get_port (struct sockaddr *);
-int      gt_toaddr   (char *, size_t, struct sockaddr *);
-
-int gt_show   (int, char **);
-int gt_bind   (int, char **);
-int gt_path   (int, char **);
-int gt_keygen (int, char **);
-int gt_bench  (int, char **);
-int gt_set    (int, char **);
--- a/src/ctl.c
+++ b/src/ctl.c
@@ -1,203 +0,0 @@
-#include "common.h"
-#include "ctl.h"
-#include "str.h"
-
-#include <stdio.h>
-#include <unistd.h>
-#include <dirent.h>
-#include <libgen.h>
-#include <sys/socket.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/un.h>
-
-char *
-ctl_rundir(char *dst, size_t size)
-{
-    if (dst && size)
-        dst[0] = 0;
-
-    const char *fmt[] = {
-        "/run/user/%u/" PACKAGE_NAME,
-        "/run/"         PACKAGE_NAME ".%u",
-        "/var/run/"     PACKAGE_NAME ".%u",
-        "/tmp/"         PACKAGE_NAME ".%u",
-    };
-
-    for (unsigned i = 0; i < COUNT(fmt); i++) {
-        char path[128];
-        int ret = snprintf(dst, size, fmt[i], geteuid());
-
-        if ((ret <= 0) ||
-            ((size_t)ret >= size) ||
-            ((size_t)ret >= sizeof(path)))
-            continue;
-
-        memcpy(path, dst, (size_t)ret + 1);
-        char *p = dirname(path);
-
-        if (p && !access(p, W_OK))
-            return dst;
-    }
-
-    errno = EINTR;
-    return NULL;
-}
-
-int
-ctl_reply(int fd, struct ctl_msg *res, struct ctl_msg *req)
-{
-    if ((send(fd, req, sizeof(struct ctl_msg), 0) == -1) ||
-        (recv(fd, res, sizeof(struct ctl_msg), 0) == -1))
-        return -1;
-
-    if (res->type != req->type || !res->reply) {
-        errno = EBADMSG;
-        return -1;
-    }
-
-    if (res->ret) {
-        errno = res->ret;
-        return -1;
-    }
-
-    return 0;
-}
-
-static int
-ctl_setsun(struct sockaddr_un *dst, const char *dir, const char *file)
-{
-    struct sockaddr_un sun = {
-        .sun_family = AF_UNIX,
-    };
-
-    int ret = snprintf(sun.sun_path, sizeof(sun.sun_path), "%s/%s", dir, file);
-
-    if (ret <= 0 || (size_t)ret >= sizeof(sun.sun_path)) {
-        errno = EINVAL;
-        return -1;
-    }
-
-    if (dst)
-        *dst = sun;
-
-    return 0;
-}
-
-static int
-ctl_bind(int fd, const char *dir, const char *file)
-{
-    char name[10] = { [0] = '.' };
-    struct sockaddr_un sun;
-
-    if (str_empty(file)) {
-        unsigned pid = (unsigned)getpid();
-
-        for (size_t i = 1; i < sizeof(name) - 1; i++, pid >>= 4)
-            name[i] = "uncopyrightables"[pid & 15];
-
-        file = name;
-    }
-
-    if (ctl_setsun(&sun, dir, file))
-        return -1;
-
-    if (unlink(sun.sun_path) && errno != ENOENT)
-        return -1;
-
-    return bind(fd, (struct sockaddr *)&sun, sizeof(sun));
-}
-
-void
-ctl_delete(int fd)
-{
-    struct sockaddr_storage ss = { 0 };
-    socklen_t sslen = sizeof(ss);
-
-    if ((getsockname(fd, (struct sockaddr *)&ss, &sslen) == 0) &&
-        (ss.ss_family == AF_UNIX))
-        unlink(((struct sockaddr_un *)&ss)->sun_path);
-
-    close(fd);
-}
-
-int
-ctl_create(const char *file)
-{
-    char dir[64];
-
-    if (!ctl_rundir(dir, sizeof(dir)))
-        return -1;
-
-    if (mkdir(dir, 0700) == -1 && errno != EEXIST)
-        return -1;
-
-    int fd = socket(AF_UNIX, SOCK_DGRAM, 0);
-
-    if (ctl_bind(fd, dir, file)) {
-        int err = errno;
-        close(fd);
-        errno = err;
-        return -1;
-    }
-
-    return fd;
-}
-
-int
-ctl_connect(const char *file)
-{
-    char dir[64];
-    DIR *dp = NULL;
-
-    if (!ctl_rundir(dir, sizeof(dir)))
-        return -1;
-
-    if (!file) {
-        if (dp = opendir(dir), !dp)
-            return -1;
-
-        struct dirent *d = NULL;
-
-        while (d = readdir(dp), d) {
-            if (d->d_name[0] == '.')
-                continue;
-
-            if (file) {
-                closedir(dp);
-                return CTL_ERROR_MANY;
-            }
-
-            file = &d->d_name[0];
-        }
-
-        if (!file) {
-            closedir(dp);
-            return CTL_ERROR_NONE;
-        }
-    }
-
-    struct sockaddr_un sun;
-    const int ret = ctl_setsun(&sun, dir, file);
-
-    if (dp) {
-        int err = errno;
-        closedir(dp);
-        errno = err;
-    }
-
-    if (ret)
-        return -1;
-
-    int fd = socket(AF_UNIX, SOCK_DGRAM, 0);
-
-    if (ctl_bind(fd, dir, NULL) ||
-        connect(fd, (struct sockaddr *)&sun, sizeof(sun))) {
-        int err = errno;
-        ctl_delete(fd);
-        errno = err;
-        return -1;
-    }
-
-    return fd;
-}
--- a/src/ctl.h
+++ b/src/ctl.h
@@ -1,49 +0,0 @@
-#pragma once
-
-#include "../mud/mud.h"
-
-#include <sys/socket.h>
-
-#define CTL_ERROR_NONE (-2)
-#define CTL_ERROR_MANY (-3)
-
-enum ctl_type {
-    CTL_NONE = 0,
-    CTL_STATE,
-    CTL_CONF,
-    CTL_STATUS,
-    CTL_PATH_STATUS,
-    CTL_BAD,
-};
-
-struct ctl_msg {
-    enum ctl_type type;
-    int reply, ret;
-    union {
-        struct {
-            struct sockaddr_storage addr;
-            enum mud_state state;
-            unsigned long rate_tx;
-            unsigned long rate_rx;
-            unsigned long beat;
-            unsigned char fixed_rate;
-        } path;
-        struct {
-            char tun_name[64];
-            long pid;
-            size_t mtu;
-            int chacha;
-            struct sockaddr_storage bind;
-            struct sockaddr_storage peer;
-        } status;
-        struct mud_conf conf;
-        struct mud_path path_status;
-        struct mud_bad bad;
-    };
-};
-
-char *ctl_rundir  (char *, size_t);
-int   ctl_create  (const char *);
-int   ctl_connect (const char *);
-int   ctl_reply   (int, struct ctl_msg *, struct ctl_msg *);
-void  ctl_delete  (int);
--- a/src/db.c
+++ b/src/db.c
@@ -0,0 +1,155 @@
+#include "common.h"
+
+#include "db.h"
+#include "str.h"
+
+#define CBIT(X)      (1&(intptr_t)(X))
+#define CBIT_PTR(X)  (uint8_t *)(1|(intptr_t)(X))
+#define CBIT_NODE(X) (struct node *)(1^(intptr_t)(X))
+
+struct node {
+    uint8_t *child[2];
+    uint32_t point;
+};
+
+_pure_
+static inline size_t db_size (const uint8_t *a)
+{
+    return (a[0]?:str_len((char *)a+1))+1;
+}
+
+_pure_
+static inline size_t db_cmp (const uint8_t *a, const uint8_t *b)
+{
+    const size_t size = a[0];
+
+    if (size!=b[0])
+        return 1;
+
+    if (!size) {
+        size_t i = str_cmp((char *)a+1, (char *)b+1);
+        return i?i+1:0;
+    }
+
+    for (size_t i=1; i<=size; i++) {
+        if (a[i]!=b[i])
+            return i+1;
+    }
+
+    return 0;
+}
+
+_pure_
+static inline int db_dir (const uint32_t point, uint8_t *data, const size_t size)
+{
+    const size_t pos = point>>8;
+
+    if (pos>=size)
+        return 0;
+
+    return ((point|data[pos])&255)==255;
+}
+
+uint8_t *db_search (uint8_t **p, uint8_t *data)
+{
+    if _0_(!*p)
+        return NULL;
+
+    uint8_t *r = *p;
+    const size_t size = db_size(data);
+
+    while (CBIT(r)) {
+        struct node *node = CBIT_NODE(r);
+        r = node->child[db_dir(node->point, data, size)];
+    }
+
+    if (!db_cmp(r, data))
+        return r;
+
+    return NULL;
+}
+
+uint8_t *db_insert (uint8_t **p, uint8_t *data)
+{
+    if _0_(CBIT(data))
+        return NULL;
+
+    if _0_(!*p) {
+        *p = data;
+        return data;
+    }
+
+    uint8_t *r = *p;
+    size_t size = db_size(data);
+
+    while (CBIT(r)) {
+        struct node *node = CBIT_NODE(r);
+        r = node->child[db_dir(node->point, data, size)];
+    }
+
+    const size_t diff = db_cmp(r, data);
+
+    if _0_(!diff)
+        return r;
+
+    const size_t pos = diff-1;
+    const uint8_t mask = ~((1u<<31)>>CLZ(r[pos]^data[pos]));
+    const size_t point = (pos<<8)|mask;
+
+    while (CBIT(*p)) {
+        struct node *node = CBIT_NODE(*p);
+
+        if (node->point>point)
+            break;
+
+        p = node->child+db_dir(node->point, data, size);
+    }
+
+    struct node *node = malloc(sizeof(struct node));
+
+    if _0_(!node)
+        return NULL;
+
+    const int dir = (mask|r[pos])==255;
+
+    node->child[dir] = *p;
+    node->child[1-dir] = data;
+    node->point = point;
+
+    *p = CBIT_PTR(node);
+
+    return data;
+}
+
+uint8_t *db_remove (uint8_t **p, uint8_t *data)
+{
+    if _0_(!*p)
+        return NULL;
+
+    const size_t size = db_size(data);
+
+    uint8_t **p_old = NULL;
+    struct node *node = NULL;
+    int dir = 0;
+
+    while (CBIT(*p)) {
+        p_old = p;
+        node = CBIT_NODE(*p);
+        dir = db_dir(node->point, data, size);
+        p = node->child+dir;
+    }
+
+    if _0_(db_cmp(data, *p))
+        return NULL;
+
+    uint8_t *r = *p;
+
+    if (p_old) {
+        *p_old = node->child[1-dir];
+        free(node);
+    } else {
+        *p = NULL;
+    }
+
+    return r;
+}
--- a/src/db.h
+++ b/src/db.h
@@ -0,0 +1,7 @@
+#pragma once
+
+#include <stdint.h>
+
+uint8_t *db_search (uint8_t **, uint8_t *);
+uint8_t *db_insert (uint8_t **, uint8_t *);
+uint8_t *db_remove (uint8_t **, uint8_t *);
--- a/src/iface.c
+++ b/src/iface.c
@@ -1,39 +0,0 @@
-#include "common.h"
-#include "iface.h"
-
-#include <stdio.h>
-#include <net/if.h>
-#include <sys/ioctl.h>
-
-int
-iface_set_mtu(const char *dev_name, size_t mtu)
-{
-    if (mtu > (size_t)0xFFFF) {
-        errno = EINVAL;
-        return -1;
-    }
-
-    struct ifreq ifr = {
-        .ifr_mtu = (int)mtu,
-    };
-
-    int ret = snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", dev_name);
-
-    if (ret <= 0 || (size_t)ret >= sizeof(ifr.ifr_name)) {
-        errno = EINVAL;
-        return -1;
-    }
-
-    int fd = socket(AF_INET, SOCK_DGRAM, 0);
-
-    if (fd == -1)
-        return -1;
-
-    ret = ioctl(fd, SIOCSIFMTU, &ifr);
-
-    int err = errno;
-    close(fd);
-    errno = err;
-
-    return ret;
-}
--- a/src/iface.h
+++ b/src/iface.h
@@ -1,3 +0,0 @@
-#pragma once
-
-int iface_set_mtu (const char *, size_t);
--- a/src/ip.h
+++ b/src/ip.h
@@ -3,95 +3,37 @@
 #include <stdint.h>

 struct ip_common {
-    uint8_t tc;
+    uint8_t version;
    uint8_t proto;
-    struct { // data are not reordered
-        union {
-            unsigned char v6[16];
-            struct {
-                unsigned char zero[10];
-                unsigned char ff[2];
-                unsigned char v4[4];
-            };
-        };
-        unsigned char port[2];
-    } src, dst;
+    uint8_t hdr_size;
+    uint16_t size;
 };

-static inline int
-ip_read16(const uint8_t *src)
+_pure_
+static inline uint8_t ip_get_version (const uint8_t *data, size_t size)
 {
-    return ((int)src[1]) | (((int)src[0]) << 8);
-}
-
-static inline uint8_t
-ip_get_version(const uint8_t *data, int size)
-{
-    if (size < 20)
+    if (size<20)
        return 0;

-    return data[0] >> 4;
+    return data[0]>>4;
 }

-static inline int
-ip_is_valid(const uint8_t *data, int size)
+static inline int ip_get_common (struct ip_common *ic, const uint8_t *data, size_t size)
 {
-    switch (ip_get_version(data, size)) {
-        case 4: return size == ip_read16(&data[2]);
-        case 6: return size == ip_read16(&data[4]) + 40;
-    }
+    ic->version = ip_get_version(data, size);

-    return 0;
-}
-
-static inline int
-ip_get_common(struct ip_common *ic, const uint8_t *data, int size)
-{
-    switch (ip_get_version(data, size)) {
+    switch (ic->version) {
    case 4:
-        ic->tc = data[1];
        ic->proto = data[9];
-        if (size == ip_read16(&data[2])) {
-            const int hdrsize = (data[0] & 0xF) << 2;
-            memset(ic->src.zero, 0, sizeof(ic->src.zero));
-            memset(ic->src.ff, 0xff, sizeof(ic->src.ff));
-            memcpy(ic->src.v4, &data[12], sizeof(ic->src.v4));
-            memset(ic->dst.zero, 0, sizeof(ic->dst.zero));
-            memset(ic->dst.ff, 0xff, sizeof(ic->dst.ff));
-            memcpy(ic->dst.v4, &data[16], sizeof(ic->dst.v4));
-            switch (ic->proto) {
-            case 6:  // tcp
-            case 17: // udp
-                memcpy(ic->src.port, &data[hdrsize], sizeof(ic->src.port));
-                memcpy(ic->dst.port, &data[hdrsize + 2], sizeof(ic->dst.port));
-                break;
-            default:
-                memset(ic->src.port, 0, sizeof(ic->src.port));
-                memset(ic->dst.port, 0, sizeof(ic->dst.port));
-            }
-            return 0;
-        }
-        break;
+        ic->hdr_size = (data[0]&0xF)<<2;
+        ic->size = ((data[2]<<8)|data[3]);
+        return 0;
    case 6:
-        ic->tc = (uint8_t)((data[0] << 4) | (data[1] >> 4));
        ic->proto = data[6];
-        if (size == ip_read16(&data[4]) + 40) {
-            memcpy(ic->src.v6, &data[8], sizeof(ic->src.v6));
-            memcpy(ic->dst.v6, &data[24], sizeof(ic->dst.v6));
-            switch (ic->proto) {
-            case 6:  // tcp
-            case 17: // udp
-                memcpy(ic->src.port, &data[40], sizeof(ic->src.port));
-                memcpy(ic->dst.port, &data[42], sizeof(ic->dst.port));
-                break;
-            default:
-                memset(ic->src.port, 0, sizeof(ic->src.port));
-                memset(ic->dst.port, 0, sizeof(ic->dst.port));
-            }
-            return 0;
-        }
-        break;
+        ic->hdr_size = 40;
+        ic->size = ((data[4]<<8)|data[5])+40;
+        return 0;
    }

-    return 1;
+    return -1;
 }
--- a/src/keygen.c
+++ b/src/keygen.c
@@ -1,22 +0,0 @@
-#include "common.h"
-
-#include <sodium.h>
-#include <stdio.h>
-
-int
-gt_keygen(int argc, char **argv)
-{
-    if (sodium_init() == -1) {
-        gt_log("sodium init failed\n");
-        return 1;
-    }
-
-    unsigned char key[32];
-    randombytes_buf(key, sizeof(key));
-
-    char buf[2 * sizeof(key) + 1];
-    gt_tohex(buf, sizeof(buf), key, sizeof(key));
-    printf("%s\n", buf);
-
-    return 0;
-}
--- a/src/main.c
+++ b/src/main.c
@@ -1,31 +1,73 @@
 #include "common.h"
+
+#include "buffer.h"
+#include "ip.h"
 #include "str.h"
+#include "option.h"
+#include "tun.h"
+#include "db.h"
+#include "state.h"
+
+#include <inttypes.h>
+#include <limits.h>
+#include <stdio.h>
+#include <signal.h>
+#include <poll.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+
+#include <arpa/inet.h>
+#include <netdb.h>

 #include <sodium.h>
-#include <stdio.h>

-#include "../argz/argz.h"
+#include "mud.h"

-volatile sig_atomic_t gt_alarm;
-volatile sig_atomic_t gt_reload;
-volatile sig_atomic_t gt_quit;
+#ifndef O_CLOEXEC
+#define O_CLOEXEC 0
+#endif

-static void
-gt_sa_handler(int sig)
+static struct {
+    int timeout;
+    volatile sig_atomic_t quit;
+    volatile sig_atomic_t info;
+    uint8_t key[crypto_generichash_KEYBYTES];
+} gt;
+
+static void fd_set_nonblock (int fd)
+{
+    int ret;
+
+    do {
+        ret = fcntl(fd, F_GETFL, 0);
+    } while (ret==-1 && errno==EINTR);
+
+    int flags = (ret==-1)?0:ret;
+
+    do {
+        ret = fcntl(fd, F_SETFL, flags|O_NONBLOCK);
+    } while (ret==-1 && errno==EINTR);
+
+    if (ret==-1)
+        perror("fcntl O_NONBLOCK");
+}
+
+static void gt_sa_handler (int sig)
 {
    switch (sig) {
-    case SIGALRM:
-        gt_alarm = 1;
-        return;
-    case SIGHUP:
-        gt_reload = 1; /* FALLTHRU */
-    default:
-        gt_quit = 1;
+    case SIGINT:
+    case SIGQUIT:
+    case SIGTERM:
+        gt.quit = 1;
+        break;
+    case SIGUSR1:
+        gt.info = 1;
+        break;
    }
 }

-static void
-gt_set_signal(void)
+static void gt_set_signal (void)
 {
    struct sigaction sa = {
        .sa_flags = 0,
@@ -34,74 +76,333 @@ gt_set_signal(void)
    sigemptyset(&sa.sa_mask);

    sa.sa_handler = gt_sa_handler;
-    sigaction(SIGINT, &sa, NULL);
+    sigaction(SIGINT,  &sa, NULL);
    sigaction(SIGQUIT, &sa, NULL);
    sigaction(SIGTERM, &sa, NULL);
-    sigaction(SIGHUP, &sa, NULL);
-    sigaction(SIGALRM, &sa, NULL);
+    sigaction(SIGUSR1, &sa, NULL);

    sa.sa_handler = SIG_IGN;
+    sigaction(SIGHUP,  &sa, NULL);
    sigaction(SIGPIPE, &sa, NULL);
-    sigaction(SIGUSR1, &sa, NULL);
-    sigaction(SIGUSR2, &sa, NULL);
 }

-static int
-gt_version(int argc, char **argv)
+static ssize_t fd_read (int fd, void *data, size_t size)
 {
-    struct argz version_argz[] = {
-        {"libsodium", NULL, NULL, argz_option},
-        {NULL}};
+    if ((fd==-1) || !size)
+        return -1;

-    if (argz(version_argz, argc, argv))
-        return 1;
+    ssize_t ret = read(fd, data, size);

-    if (argz_is_set(version_argz, "libsodium")) {
-        printf("%s\n", sodium_version_string());
-    } else {
-        printf("%s\n", PACKAGE_VERSION);
+    if (ret==-1) {
+        if (errno==EAGAIN || errno==EINTR)
+            return -1;
+
+        if (errno)
+            perror("read");
+
+        return 0;
+    }
+
+    return ret;
+}
+
+static ssize_t fd_write (int fd, const void *data, size_t size)
+{
+    if ((fd==-1) || !size)
+        return -1;
+
+    ssize_t ret = write(fd, data, size);
+
+    if (ret==-1) {
+        if (errno==EAGAIN || errno==EINTR)
+            return -1;
+
+        if (errno==EPIPE || errno==ECONNRESET)
+            return 0;
+
+        if (errno)
+            perror("write");
+
+        return 0;
+    }
+
+    return ret;
+}
+
+static size_t fd_read_all (int fd, void *data, size_t size)
+{
+    size_t done = 0;
+
+    while (done<size) {
+        ssize_t ret = fd_read(fd, (uint8_t *)data+done, size-done);
+
+        if (!ret)
+            break;
+
+        if (ret<0) {
+            struct pollfd pollfd = {
+                .fd = fd,
+                .events = POLLIN,
+            };
+
+            if (!poll(&pollfd, 1, gt.timeout))
+                break;
+
+            continue;
+        }
+
+        done += ret;
+    }
+
+    return done;
+}
+
+static size_t fd_write_all (int fd, const void *data, size_t size)
+{
+    size_t done = 0;
+
+    while (done<size) {
+        ssize_t ret = fd_write(fd, (const uint8_t *)data+done, size-done);
+
+        if (!ret)
+            break;
+
+        if (ret<0) {
+            struct pollfd pollfd = {
+                .fd = fd,
+                .events = POLLOUT,
+            };
+
+            if (!poll(&pollfd, 1, gt.timeout))
+                break;
+
+            continue;
+        }
+
+        done += ret;
+    }
+
+    return done;
+}
+
+static int gt_setup_secretkey (char *keyfile)
+{
+    const size_t size = sizeof(gt.key);
+
+    if (str_empty(keyfile)) {
+        char buf[2*size+1];
+
+        randombytes_buf(gt.key, size);
+        gt_tohex(buf, sizeof(buf), gt.key, size);
+        state("SECRETKEY", buf);
+
+        return 0;
+    }
+
+    int fd;
+
+    do {
+        fd = open(keyfile, O_RDONLY|O_CLOEXEC);
+    } while (fd==-1 && errno==EINTR);
+
+    if (fd==-1) {
+        perror("open keyfile");
+        return -1;
+    }
+
+    char key[2*size];
+    size_t r = fd_read_all(fd, key, sizeof(key));
+
+    close(fd);
+
+    if (r!=sizeof(key)) {
+        gt_log("unable to read secret key\n");
+        return -1;
+    }
+
+    if (gt_fromhex(gt.key, size, key, sizeof(key))) {
+        gt_log("secret key is not valid\n");
+        return -1;
    }

    return 0;
 }

-int
-main(int argc, char **argv)
+int main (int argc, char **argv)
 {
    gt_set_signal();

-    struct {
-        char *name;
-        char *help;
-        int (*call)(int, char **);
-    } cmd[] = {
-        {"show", "show tunnel info", gt_show},
-        {"bench", "start a crypto bench", gt_bench},
-        {"bind", "start a new tunnel", gt_bind},
-        {"set", "change tunnel properties", gt_set},
-        {"keygen", "generate a new secret key", gt_keygen},
-        {"path", "manage paths", gt_path},
-        {"version", "show version", gt_version},
-        {NULL}};
+    char *host = NULL;
+    char *port = "5000";
+    char *bind_list = NULL;
+    char *bind_port = "5000";
+    char *dev = NULL;
+    char *keyfile = NULL;
+    char *statefile = NULL;

-    if (argv[1]) {
-        for (int k = 0; cmd[k].name; k++) {
-            if (!str_cmp(cmd[k].name, argv[1]))
-                return cmd[k].call(argc - 1, argv + 1);
+    gt.timeout = 5000;
+
+    struct option opts[] = {
+        { "host",        &host,         option_str    },
+        { "port",        &port,         option_str    },
+        { "bind",        &bind_list,    option_str    },
+        { "bind-port",   &bind_port,    option_str    },
+        { "dev",         &dev,          option_str    },
+        { "keyfile",     &keyfile,      option_str    },
+        { "multiqueue",  NULL,          option_option },
+        { "statefile",   &statefile,    option_str    },
+        { "timeout",     &gt.timeout,   option_long   },
+        { "version",     NULL,          option_option },
+        { NULL },
+    };
+
+    if (option(opts, argc, argv))
+        return 1;
+
+    if (option_is_set(opts, "version")) {
+        gt_print(PACKAGE_STRING"\n");
+        return 0;
+    }
+
+    if (!option_is_set(opts, "keyfile")) {
+        gt_log("keyfile option must be set\n");
+        return 1;
+    }
+
+    if (gt.timeout<=0 || gt.timeout>INT_MAX) {
+        gt_log("bad timeout\n");
+        return 1;
+    }
+
+    if (sodium_init()==-1) {
+        gt_log("libsodium initialization has failed\n");
+        return 1;
+    }
+
+    if (!crypto_aead_aes256gcm_is_available()) {
+        gt_na("AES-256-GCM");
+        return 1;
+    }
+
+    if (state_init(statefile))
+        return 1;
+
+    char *tun_name = NULL;
+
+    int tun_fd = tun_create(dev, &tun_name, option_is_set(opts, "multiqueue"));
+
+    if (tun_fd==-1) {
+        gt_log("couldn't create tun device\n");
+        return 1;
+    }
+
+    fd_set_nonblock(tun_fd);
+
+    if (gt_setup_secretkey(keyfile))
+        return 1;
+
+    struct mud *mud = mud_create(bind_port);
+
+    if (!mud) {
+        gt_log("couldn't create mud\n");
+        return 1;
+    }
+
+    mud_set_key(mud, gt.key, sizeof(gt.key));
+
+    if (bind_list) {
+        char tmp[1024];
+        char *name = &tmp[0];
+
+        size_t size = str_cpy(tmp, bind_list, sizeof(tmp)-1);
+
+        for (size_t i=0; i<size; i++) {
+            if (tmp[i]!=',')
+                continue;
+
+            tmp[i] = 0;
+
+            if (mud_bind(mud, name))
+                return 1;
+
+            name = &tmp[i+1];
+        }
+
+        if (name[0] && mud_bind(mud, name))
+            return 1;
+    }
+
+    if (host && mud_peer(mud, host, port))
+        return 1;
+
+    int mud_fd = mud_get_fd(mud);
+
+    state("INITIALIZED", tun_name);
+
+    fd_set rfds;
+    FD_ZERO(&rfds);
+
+    int started = 0;
+    unsigned char buf[2048];
+
+    while (!gt.quit) {
+        FD_SET(tun_fd, &rfds);
+
+        if (mud_can_pull(mud)) {
+            FD_SET(mud_fd, &rfds);
+        } else {
+            FD_CLR(mud_fd, &rfds);
+        }
+
+        struct timeval timeout = {
+            .tv_usec = 1000,
+        };
+
+        if _0_(select(mud_fd+1, &rfds, NULL, NULL, &timeout)==-1) {
+            if (errno==EINTR)
+                continue;
+            perror("select");
+            return 1;
+        }
+
+        if (mud_is_up(mud)) {
+            if (!started) {
+                state("STARTED", NULL);
+                started = 1;
+            }
+        } else if (started) {
+            state("STOPPED", NULL);
+            started = 0;
+        }
+
+        if (FD_ISSET(tun_fd, &rfds)) {
+            while (1) {
+                const ssize_t r = tun_read(tun_fd, buf, sizeof(buf));
+
+                if (r<=0)
+                    break;
+
+                struct ip_common ic;
+
+                if (!ip_get_common(&ic, buf, sizeof(buf)) && ic.size==r)
+                    mud_send(mud, buf, r);
+            }
+        }
+
+        mud_push(mud);
+
+        if (FD_ISSET(mud_fd, &rfds))
+            mud_pull(mud);
+
+        while (1) {
+            const int r = mud_recv(mud, buf, sizeof(buf));
+
+            if (r<=0)
+                break;
+
+            tun_write(tun_fd, buf, r);
        }
    }

-    printf("available commands:\n\n");
-
-    int len = 0;
-
-    for (int k = 0; cmd[k].name; k++)
-        len = MAX(len, (int)str_len(cmd[k].name, 32));
-
-    for (int k = 0; cmd[k].name; k++)
-        printf("  %-*s  %s\n", len, cmd[k].name, cmd[k].help);
-
-    printf("\n");
-
-    return 1;
+    return 0;
 }
--- a/src/option.c
+++ b/src/option.c
@@ -0,0 +1,140 @@
+#include "common.h"
+
+#include "option.h"
+#include "str.h"
+
+int option_str (void *data, int argc, char **argv)
+{
+    if (argc<2 || str_empty(argv[1])) {
+        gt_print("option `%s' need a string argument\n", argv[0]);
+        return -1;
+    }
+
+    memcpy(data, &argv[1], sizeof(argv[1]));
+
+    return 1;
+}
+
+int option_long (void *data, int argc, char **argv)
+{
+    if (argc<2 || str_empty(argv[1])) {
+        gt_print("option `%s' need an integer argument\n", argv[0]);
+        return -1;
+    }
+
+    errno = 0;
+    char *end;
+    long val = strtol(argv[1], &end, 0);
+
+    if (errno || argv[1]==end) {
+        gt_print("argument `%s' is not a valid integer\n", argv[1]);
+        return -1;
+    }
+
+    memcpy(data, &val, sizeof(val));
+
+    return 1;
+}
+
+int option_is_set (struct option *opts, const char *name)
+{
+    for (int k=0; opts[k].name; k++) {
+        if (!str_cmp(opts[k].name, name))
+            return opts[k].set;
+    }
+
+    return 0;
+}
+
+int option_option (void *data, int argc, char **argv)
+{
+    if (!data)
+        return 0;
+
+    struct option *opts = (struct option *)data;
+
+    for (int k=0; opts[k].name; k++)
+        opts[k].set = 0;
+
+    for (int i=1; i<argc; i++) {
+        int found = 0;
+
+        for (int k=0; opts[k].name; k++) {
+            if (str_cmp(opts[k].name, argv[i]))
+                continue;
+
+            if (opts[k].set) {
+                gt_print("option `%s' is already set\n", opts[k].name);
+                return -1;
+            }
+
+            int ret = opts[k].call(opts[k].data, argc-i, &argv[i]);
+
+            if (ret<0)
+                return -1;
+
+            opts[k].set = 1;
+
+            i += ret;
+            found = 1;
+            break;
+        }
+
+        if (!found)
+            return i-1;
+    }
+
+    return argc;
+}
+
+static int option_usage (struct option *opts, int slen)
+{
+    if (!opts)
+        return 0;
+
+    int len = 0;
+
+    for (int k=0; opts[k].name; k++) {
+        if (len>40) {
+            gt_print("\n%*s", slen, "");
+            len = 0;
+        }
+
+        len += gt_print(" [%s", opts[k].name);
+
+        if (opts[k].call==option_option) {
+            len += option_usage((struct option *)opts[k].data, slen+len);
+        } else {
+            len += gt_print(" ARG");
+        }
+
+        len += gt_print("]");
+    }
+
+    return len;
+}
+
+int option (struct option *opts, int argc, char **argv)
+{
+    int ret = option_option(opts, argc, argv);
+
+    if (ret==argc)
+        return 0;
+
+    if (ret<0 || ret+1>=argc)
+        return 1;
+
+    gt_print("option `%s' is unknown\n", argv[ret+1]);
+
+    int slen = gt_print("usage: %s", argv[0]);
+
+    if (slen>40) {
+        slen = 12;
+        gt_print("\n%*s", slen, "");
+    }
+
+    option_usage(opts, slen);
+    gt_print("\n");
+
+    return 1;
+}
--- a/src/option.h
+++ b/src/option.h
@@ -0,0 +1,15 @@
+#pragma once
+
+struct option {
+    char *name;
+    void *data;
+    int (*call) (void *, int, char **);
+    int set;
+};
+
+int option_option (void *, int, char **);
+int option_str    (void *, int, char **);
+int option_long   (void *, int, char **);
+
+int option_is_set (struct option *, const char *);
+int option        (struct option *, int, char **);
--- a/src/path.c
+++ b/src/path.c
@@ -1,229 +0,0 @@
-#include "common.h"
-#include "ctl.h"
-#include "str.h"
-
-#include <stdio.h>
-#include <sys/socket.h>
-#include <unistd.h>
-
-#include "../argz/argz.h"
-
-static void
-gt_path_print_status(struct mud_path *path, int term)
-{
-    char bindstr[INET6_ADDRSTRLEN];
-    char publstr[INET6_ADDRSTRLEN];
-    char peerstr[INET6_ADDRSTRLEN];
-
-    gt_toaddr(bindstr, sizeof(bindstr),
-            (struct sockaddr *)&path->local_addr);
-    gt_toaddr(publstr, sizeof(publstr),
-            (struct sockaddr *)&path->r_addr);
-    gt_toaddr(peerstr, sizeof(peerstr),
-            (struct sockaddr *)&path->addr);
-
-    const char *statestr = NULL;
-
-    switch (path->state) {
-        case MUD_UP:     statestr = "UP";     break;
-        case MUD_BACKUP: statestr = "BACKUP"; break;
-        case MUD_DOWN:   statestr = "DOWN";   break;
-        default:         return;
-    }
-
-    printf(term ? "path %s\n"
-            "  status:  %s\n"
-            "  bind:    %s port %"PRIu16"\n"
-            "  public:  %s port %"PRIu16"\n"
-            "  peer:    %s port %"PRIu16"\n"
-            "  mtu:     %zu bytes\n"
-            "  rtt:     %.3f ms\n"
-            "  rttvar:  %.3f ms\n"
-            "  rate:    %s\n"
-            "  beat:    %"PRIu64" ms\n"
-            "  tx:\n"
-            "    rate:  %"PRIu64" bytes/sec\n"
-            "    loss:  %"PRIu64" percent\n"
-            "    total: %"PRIu64" packets\n"
-            "  rx:\n"
-            "    rate:  %"PRIu64" bytes/sec\n"
-            "    loss:  %"PRIu64" percent\n"
-            "    total: %"PRIu64" packets\n"
-            : "path %s %s"
-            " %s %"PRIu16" %s %"PRIu16" %s %"PRIu16
-            " %zu %.3f %.3f"
-            " %s"
-            " %"PRIu64
-            " %"PRIu64" %"PRIu64" %"PRIu64
-            " %"PRIu64" %"PRIu64" %"PRIu64
-            "\n",
-        statestr,
-        path->ok ? "OK" : "DEGRADED",
-        bindstr[0] ? bindstr : "-",
-        gt_get_port((struct sockaddr *)&path->local_addr),
-        publstr[0] ? publstr : "-",
-        gt_get_port((struct sockaddr *)&path->r_addr),
-        peerstr[0] ? peerstr : "-",
-        gt_get_port((struct sockaddr *)&path->addr),
-        path->mtu.ok,
-        (double)path->rtt.val / 1e3,
-        (double)path->rtt.var / 1e3,
-        path->conf.fixed_rate ? "fixed" : "auto",
-        path->conf.beat / 1000,
-        path->tx.rate,
-        path->tx.loss * 100 / 255,
-        path->tx.total,
-        path->rx.rate,
-        path->rx.loss * 100 / 255,
-        path->rx.total);
-}
-
-static int
-gt_path_cmp_addr(struct sockaddr_storage *a, struct sockaddr_storage *b)
-{
-    if (a->ss_family != b->ss_family)
-        return 1;
-
-    if (a->ss_family == AF_INET) {
-        struct sockaddr_in *A = (struct sockaddr_in *)a;
-        struct sockaddr_in *B = (struct sockaddr_in *)b;
-        return ((memcmp(&A->sin_addr, &B->sin_addr, sizeof(A->sin_addr))));
-    }
-
-    if (a->ss_family == AF_INET6) {
-        struct sockaddr_in6 *A = (struct sockaddr_in6 *)a;
-        struct sockaddr_in6 *B = (struct sockaddr_in6 *)b;
-        return ((memcmp(&A->sin6_addr, &B->sin6_addr, sizeof(A->sin6_addr))));
-    }
-
-    return 1;
-}
-
-static int
-gt_path_status(int fd, enum mud_state state, struct sockaddr_storage *addr)
-{
-    struct ctl_msg req = {
-        .type = CTL_PATH_STATUS,
-    }, res = {0};
-
-    if (send(fd, &req, sizeof(struct ctl_msg), 0) == -1)
-        return -1;
-
-    struct mud_path path[MUD_PATH_MAX];
-    int count = 0;
-
-    while (1) {
-        if (recv(fd, &res, sizeof(struct ctl_msg), 0) == -1)
-            return -1;
-
-        if (res.type != req.type) {
-            errno = EBADMSG;
-            return -1;
-        }
-
-        if (res.ret == EAGAIN) {
-            memcpy(&path[count], &res.path_status, sizeof(struct mud_path));
-            count++;
-        } else if (res.ret) {
-            errno = res.ret;
-            return -1;
-        } else break;
-    }
-
-    int term = isatty(1);
-
-    for (int i = 0; i < count; i++) {
-        if ((state == MUD_EMPTY || path[i].state == state) &&
-            (!addr->ss_family || !gt_path_cmp_addr(addr, &path[i].local_addr)))
-            gt_path_print_status(&path[i], term);
-    }
-
-    return 0;
-}
-
-int
-gt_path(int argc, char **argv)
-{
-    const char *dev = NULL;
-
-    struct ctl_msg req = {
-        .type = CTL_STATE,
-        .path = {
-            .state = MUD_EMPTY,
-        },
-    }, res = {0};
-
-    struct argz ratez[] = {
-        {"fixed|auto", NULL, NULL, argz_option},
-        {"tx", "BYTES/SEC", &req.path.rate_tx, argz_bytes},
-        {"rx", "BYTES/SEC", &req.path.rate_rx, argz_bytes},
-        {NULL}};
-
-    struct argz pathz[] = {
-        {NULL, "IPADDR", &req.path.addr, argz_addr},
-        {"dev", "NAME", &dev, argz_str},
-        {"up|backup|down", NULL, NULL, argz_option},
-        {"rate", NULL, &ratez, argz_option},
-        {"beat", "SECONDS", &req.path.beat, argz_time},
-        {NULL}};
-
-    if (argz(pathz, argc, argv))
-        return 1;
-
-    int fd = ctl_connect(dev);
-
-    if (fd < 0) {
-        switch (fd) {
-        case -1:
-            perror("path");
-            break;
-        case CTL_ERROR_NONE:
-            gt_log("no device\n");
-            break;
-        case CTL_ERROR_MANY:
-            gt_log("please choose a device\n");
-            break;
-        default:
-            gt_log("couldn't connect\n");
-        }
-        return 1;
-    }
-
-    int set = argz_is_set(pathz, "rate")
-           || argz_is_set(pathz, "beat");
-
-    if (set && !req.path.addr.ss_family) {
-        gt_log("please specify a path\n");
-        return 1;
-    }
-
-    if (argz_is_set(pathz, "up")) {
-        req.path.state = MUD_UP;
-    } else if (argz_is_set(pathz, "backup")) {
-        req.path.state = MUD_BACKUP;
-    } else if (argz_is_set(pathz, "down")) {
-        req.path.state = MUD_DOWN;
-    }
-
-    if (argz_is_set(ratez, "fixed")) {
-        req.path.fixed_rate = 3;
-    } else if (argz_is_set(ratez, "auto")) {
-        req.path.fixed_rate = 1;
-    }
-
-    int ret;
-
-    if (!req.path.addr.ss_family ||
-        (req.path.state == MUD_EMPTY && !set)) {
-        ret = gt_path_status(fd, req.path.state, &req.path.addr);
-    } else {
-        ret = ctl_reply(fd, &res, &req);
-    }
-
-    if (ret == -1)
-        perror("path");
-
-    ctl_delete(fd);
-
-    return !!ret;
-}
--- a/src/set.c
+++ b/src/set.c
@@ -1,84 +0,0 @@
-#include "common.h"
-#include "ctl.h"
-#include "str.h"
-
-#include <stdio.h>
-#include <sys/socket.h>
-
-#include "../argz/argz.h"
-
-static int
-gt_argz_tc(void *data, int argc, char **argv)
-{
-    if (argc < 1 || !argv[0])
-        return -1;
-
-    int val = 0;
-    const char *s = argv[0];
-
-    if ((s[0] == 'C') && (s[1] == 'S') &&
-        (s[2] >= '0') && (s[2] <= '7') && !s[3]) {
-        val = (s[2] - '0') << 3;
-    } else if ((s[0] == 'A') && (s[1] == 'F') &&
-               (s[2] >= '1') && (s[2] <= '4') &&
-               (s[3] >= '1') && (s[3] <= '3') && !s[4]) {
-        val = ((s[2] - '0') << 3) | ((s[3] - '0') << 1);
-    } else if ((s[0] == 'E') && (s[1] == 'F') && !s[2]) {
-        val = 46;
-    } else return -1;
-
-    if (data)
-        *(int *)data = (val << 1) | 1;
-
-    return 1;
-}
-
-int
-gt_set(int argc, char **argv)
-{
-    const char *dev = NULL;
-
-    struct ctl_msg req = {
-        .type = CTL_CONF,
-    }, res = {0};
-
-    struct argz pathz[] = {
-        {"dev", "NAME", &dev, argz_str},
-        {"tc", "CS|AF|EF", &req.conf.tc, gt_argz_tc},
-        {"kxtimeout", "SECONDS", &req.conf.kxtimeout, argz_time},
-        {"timetolerance", "SECONDS", &req.conf.timetolerance, argz_time},
-        {"losslimit", "PERCENT", &req.conf.losslimit, argz_percent},
-        {"keepalive", "SECONDS", &req.conf.keepalive, argz_time},
-        {NULL}};
-
-    if (argz(pathz, argc, argv))
-        return 1;
-
-    int fd = ctl_connect(dev);
-
-    if (fd < 0) {
-        switch (fd) {
-        case -1:
-            perror("set");
-            break;
-        case CTL_ERROR_NONE:
-            gt_log("no device\n");
-            break;
-        case CTL_ERROR_MANY:
-            gt_log("please choose a device\n");
-            break;
-        default:
-            gt_log("couldn't connect\n");
-        }
-        return 1;
-    }
-
-    int ret = ctl_reply(fd, &res, &req);
-
-    if (ret)
-        perror("set");
-
-    ctl_delete(fd);
-
-    return !!ret;
-}
--- a/src/show.c
+++ b/src/show.c
@@ -1,161 +0,0 @@
-#include "common.h"
-#include "ctl.h"
-#include "str.h"
-
-#include "../argz/argz.h"
-
-#include <stdio.h>
-#include <sys/socket.h>
-#include <dirent.h>
-#include <sys/un.h>
-#include <arpa/inet.h>
-#include <unistd.h>
-
-static void
-gt_show_bad_line(int term, char *name, uint64_t count,
-                 struct sockaddr_storage *ss)
-{
-    if (!count)
-        return;
-
-    char addr[INET6_ADDRSTRLEN];
-    gt_toaddr(addr, sizeof(addr), (struct sockaddr *)ss);
-
-    printf(term ? "%s:\n"
-                  "  count: %"PRIu64"\n"
-                  "  last:  %s port %"PRIu16"\n"
-                : "%s"
-                  " %"PRIu64
-                  " %s %"PRIu16
-                  "\n",
-           name, count, addr[0] ? addr : "-",
-           gt_get_port((struct sockaddr *)ss));
-}
-
-static int
-gt_show_bad(int fd)
-{
-    struct ctl_msg res, req = {.type = CTL_BAD};
-
-    if (ctl_reply(fd, &res, &req))
-        return -1;
-
-    int term = isatty(1);
-
-    gt_show_bad_line(term, "decrypt",
-            res.bad.decrypt.count, &res.bad.decrypt.addr);
-    gt_show_bad_line(term, "difftime",
-            res.bad.difftime.count, &res.bad.difftime.addr);
-    gt_show_bad_line(term, "keyx",
-            res.bad.keyx.count, &res.bad.keyx.addr);
-
-    return 0;
-}
-
-static int
-gt_show_status(int fd)
-{
-    struct ctl_msg res, req = {.type = CTL_STATUS};
-
-    if (ctl_reply(fd, &res, &req))
-        return -1;
-
-    char bindstr[INET6_ADDRSTRLEN];
-    char peerstr[INET6_ADDRSTRLEN];
-
-    gt_toaddr(bindstr, sizeof(bindstr),
-              (struct sockaddr *)&res.status.bind);
-
-    int server = gt_toaddr(peerstr, sizeof(peerstr),
-                           (struct sockaddr *)&res.status.peer);
-
-    int term = isatty(1);
-
-    if (server) {
-        printf(term ? "server %s:\n"
-                      "  pid:    %li\n"
-                      "  bind:   %s port %"PRIu16"\n"
-                      "  mtu:    %zu\n"
-                      "  cipher: %s\n"
-                    : "server %s"
-                      " %li"
-                      " %s %"PRIu16
-                      " %zu"
-                      " %s"
-                      "\n",
-               res.status.tun_name,
-               res.status.pid,
-               bindstr[0] ? bindstr : "-",
-               gt_get_port((struct sockaddr *)&res.status.bind),
-               res.status.mtu,
-               GT_CIPHER(res.status.chacha));
-    } else {
-        printf(term ? "client %s:\n"
-                      "  pid:    %li\n"
-                      "  bind:   %s port %"PRIu16"\n"
-                      "  peer:   %s port %"PRIu16"\n"
-                      "  mtu:    %zu\n"
-                      "  cipher: %s\n"
-                    : "client %s"
-                      " %li"
-                      " %s %"PRIu16
-                      " %s %"PRIu16
-                      " %zu"
-                      " %s"
-                      "\n",
-               res.status.tun_name,
-               res.status.pid,
-               bindstr[0] ? bindstr : "-",
-               gt_get_port((struct sockaddr *)&res.status.bind),
-               peerstr[0] ? peerstr : "-",
-               gt_get_port((struct sockaddr *)&res.status.peer),
-               res.status.mtu,
-               GT_CIPHER(res.status.chacha));
-    }
-
-    return 0;
-}
-
-int
-gt_show(int argc, char **argv)
-{
-    const char *dev = NULL;
-
-    struct argz showz[] = {
-        {"dev", "NAME", &dev, argz_str},
-        {"bad", NULL, NULL, argz_option},
-        {NULL}};
-
-    if (argz(showz, argc, argv))
-        return 1;
-
-    int fd = ctl_connect(dev);
-
-    if (fd < 0) {
-        switch (fd) {
-        case -1:
-            perror("show");
-            break;
-        case CTL_ERROR_NONE:
-            gt_log("no device\n");
-            break;
-        case CTL_ERROR_MANY:
-            gt_log("please choose a device\n");
-            break;
-        default:
-            gt_log("couldn't connect\n");
-        }
-        return 1;
-    }
-
-    int ret = argz_is_set(showz, "bad")
-            ? gt_show_bad(fd)
-            : gt_show_status(fd);
-
-    if (ret == -1)
-        perror("show");
-
-    ctl_delete(fd);
-
-    return !!ret;
-}
--- a/src/state.c
+++ b/src/state.c
@@ -0,0 +1,61 @@
+#include "common.h"
+
+#include "state.h"
+#include "str.h"
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+static int state_fd = -1;
+
+int state_init (const char *filename)
+{
+    if (str_empty(filename))
+        return 0;
+
+    state_fd = open(filename, O_WRONLY);
+
+    if (state_fd==-1) {
+        if (errno!=EINTR)
+            perror("open");
+        return -1;
+    }
+
+    struct stat st = {0};
+
+    if (fstat(state_fd, &st)==-1) {
+        perror("fstat");
+        close(state_fd);
+        state_fd = -1;
+        return -1;
+    }
+
+    if (!S_ISFIFO(st.st_mode)) {
+        gt_log("`%s' is not a fifo\n", filename);
+        close(state_fd);
+        state_fd = -1;
+        return -1;
+    }
+
+    return 0;
+}
+
+void state (const char *state, const char *info)
+{
+    if (str_empty(state))
+        return;
+
+    const char *strs[] = { state, " ", info, "\n" };
+    char *str = str_cat(strs, COUNT(strs));
+
+    if (!str)
+        return;
+
+    if (state_fd==-1) {
+        gt_print("%s", str);
+    } else {
+        if (write(state_fd, str, str_len(str))==-1 && errno!=EINTR)
+            perror("write");
+    }
+}
--- a/src/state.h
+++ b/src/state.h
@@ -0,0 +1,4 @@
+#pragma once
+
+int  state_init (const char *);
+void state      (const char *, const char *);
--- a/src/str.h
+++ b/src/str.h
@@ -2,32 +2,72 @@

 #include "common.h"

-_pure_ static inline int
-str_empty(const char *restrict str)
+static inline size_t str_cpy (char *restrict dst, const char *restrict src, size_t len)
+{
+    if (!dst || !src)
+        return 0;
+
+    size_t i;
+
+    for (i=0; i<len && src[i]; i++)
+        dst[i] = src[i];
+
+    dst[i] = 0;
+
+    return i;
+}
+
+_pure_
+static inline int str_empty (const char *restrict str)
 {
    return !str || !str[0];
 }

-_pure_ static inline size_t
-str_cmp(const char *restrict sa, const char *restrict sb)
+_pure_
+static inline size_t str_cmp (const char *restrict sa, const char *restrict sb)
 {
    if (!sa || !sb)
        return 1;

    size_t i = 0;

-    while (sa[i] == sb[i])
+    while (sa[i]==sb[i])
        if (!sa[i++])
            return 0;

-    return i + 1;
+    return i+1;
 }

-_pure_ static inline size_t
-str_len(const char *restrict str, size_t len)
+_pure_
+static inline size_t str_len (const char *restrict str)
 {
    if (!str)
        return 0;

-    return strnlen(str, len);
+    return strlen(str);
+}
+
+static inline char *str_cat (const char **strs, size_t count)
+{
+    size_t size = 1;
+
+    for (size_t i=0; i<count; i++)
+        size += str_len(strs[i]);
+
+    char *str = malloc(size);
+
+    if (!str)
+        return NULL;
+
+    char *p = str;
+
+    for (size_t i=0; i<count; i++) {
+        size_t len = str_len(strs[i]);
+        memcpy(p, strs[i], len);
+        p += len;
+    }
+
+    p[0] = 0;
+
+    return str;
 }
--- a/src/tun.c
+++ b/src/tun.c
@@ -1,26 +1,25 @@
 #include "common.h"
-#include "ip.h"
-#include "str.h"
-#include "tun.h"

-#include <fcntl.h>
+#include "tun.h"
+#include "str.h"
+#include "ip.h"
+
 #include <stdio.h>
+#include <fcntl.h>
+
 #include <sys/ioctl.h>
 #include <sys/socket.h>
 #include <sys/uio.h>
-#include <net/if.h>

 #ifdef __linux__
-#define IFF_TUN 0x0001
-#define IFF_NO_PI 0x1000
-#define TUNSETIFF _IOW('T', 202, int)
-#define TUNSETPERSIST _IOW('T', 203, int)
+#include <linux/if.h>
+#include <linux/if_tun.h>
 #endif

 #ifdef __APPLE__
-#include <net/if_utun.h>
-#include <sys/kern_control.h>
 #include <sys/sys_domain.h>
+#include <sys/kern_control.h>
+#include <net/if_utun.h>
 #endif

 #if defined(__APPLE__) || defined(__OpenBSD__)
@@ -29,29 +28,20 @@

 #ifdef __APPLE__

-static int
-tun_create_by_id(char *name, size_t len, unsigned id)
+static int tun_create_by_id (char *name, size_t size, unsigned id, _unused_ int mq)
 {
-    int ret = snprintf(name, len, "utun%u", id);
-
-    if (ret <= 0 || (size_t)ret >= len) {
-        errno = EINVAL;
-        return -1;
-    }
-
    int fd = socket(PF_SYSTEM, SOCK_DGRAM, SYSPROTO_CONTROL);

-    if (fd == -1)
+    if (fd==-1)
        return -1;

-    struct ctl_info ci = {
-        .ctl_name = UTUN_CONTROL_NAME,
-    };
+    struct ctl_info ci;
+
+    memset(&ci, 0, sizeof(ci));
+    str_cpy(ci.ctl_name, UTUN_CONTROL_NAME, sizeof(ci.ctl_name)-1);

    if (ioctl(fd, CTLIOCGINFO, &ci)) {
-        int err = errno;
        close(fd);
-        errno = err;
        return -1;
    }

@@ -60,164 +50,157 @@ tun_create_by_id(char *name, size_t len, unsigned id)
        .sc_len = sizeof(sc),
        .sc_family = AF_SYSTEM,
        .ss_sysaddr = AF_SYS_CONTROL,
-        .sc_unit = id + 1,
+        .sc_unit = id+1,
    };

    if (connect(fd, (struct sockaddr *)&sc, sizeof(sc))) {
-        int err = errno;
        close(fd);
-        errno = err;
        return -1;
    }

+    snprintf(name, size, "utun%u", id);
+
    return fd;
 }

-static int
-tun_create_by_name(char *name, size_t len, const char *dev_name)
+static int tun_create_by_name (char *name, size_t size, char *dev_name, int mq)
 {
    unsigned id = 0;

-    if (sscanf(dev_name, "utun%u", &id) != 1) {
-        errno = EINVAL;
+    if (sscanf(dev_name, "utun%u", &id)!=1)
        return -1;
-    }

-    return tun_create_by_id(name, len, id);
+    return tun_create_by_id(name, size, id, mq);
 }

 #else /* not __APPLE__ */

 #ifdef __linux__

-static int
-tun_create_by_name(char *name, size_t len, const char *dev_name)
+static int tun_create_by_name (char *name, size_t size, char *dev_name, int mq)
 {
-    int ret = snprintf(name, len, "%s", dev_name);
-
-    if (ret <= 0 || (size_t)ret >= len) {
-        errno = EINVAL;
-        return -1;
-    }
-
-    struct ifreq ifr = {
-        .ifr_flags = IFF_TUN | IFF_NO_PI,
-    };
-
-    ret = snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", dev_name);
-
-    if (ret <= 0 || (size_t)ret >= sizeof(ifr.ifr_name)) {
-        errno = EINVAL;
-        return -1;
-    }
-
    int fd = open("/dev/net/tun", O_RDWR);

-    if (fd == -1)
+    if (fd==-1)
        return -1;

+    struct ifreq ifr = {
+        .ifr_flags = IFF_TUN|IFF_NO_PI,
+    };
+
+    if (mq) {
+#ifdef IFF_MULTI_QUEUE
+        ifr.ifr_flags |= IFF_MULTI_QUEUE;
+#endif
+    }
+
+    str_cpy(ifr.ifr_name, dev_name, IFNAMSIZ-1);
+
    if (ioctl(fd, TUNSETIFF, &ifr)) {
-        int err = errno;
        close(fd);
-        errno = err;
        return -1;
    }

+    str_cpy(name, ifr.ifr_name, size-1);
+
    return fd;
 }

 #else /* not __linux__ not __APPLE__ */

-static int
-tun_create_by_name(char *name, size_t len, const char *dev_name)
+static int tun_create_by_name (char *name, size_t size, char *dev_name, _unused_ int mq)
 {
-    int ret = snprintf(name, len, "/dev/%s", dev_name);
+    char path[64];

-    if (ret <= 0 || (size_t)ret >= len) {
-        errno = EINVAL;
-        return -1;
-    }
+    snprintf(path, sizeof(path), "/dev/%s", dev_name);
+    str_cpy(name, dev_name, size-1);

-    return open(tmp, O_RDWR);
+    return open(path, O_RDWR);
 }

 #endif /* not __APPLE__ */

-static int
-tun_create_by_id(char *name, size_t len, unsigned id)
+static int tun_create_by_id (char *name, size_t size, unsigned id, int mq)
 {
-    char tmp[64];
-    int ret = snprintf(tmp, sizeof(tmp), "tun%u", id);
+    char dev_name[64];

-    if (ret <= 0 || (size_t)ret >= sizeof(tmp)) {
-        errno = EINVAL;
-        return -1;
-    }
+    snprintf(dev_name, sizeof(dev_name), "tun%u", id);

-    return tun_create_by_name(name, len, tmp);
+    return tun_create_by_name(name, size, dev_name, mq);
 }

 #endif

-int
-tun_create(char *name, size_t len, const char *dev_name)
+int tun_create (char *dev_name, char **ret_name, int mq)
 {
+    char name[64] = {0};
    int fd = -1;

+#ifndef IFF_MULTI_QUEUE
+    if (mq)
+        gt_na("IFF_MULTI_QUEUE");
+#endif
+
    if (str_empty(dev_name)) {
-        for (unsigned id = 0; id < 32 && fd == -1; id++)
-            fd = tun_create_by_id(name, len, id);
+        for (unsigned id=0; id<32 && fd==-1; id++)
+            fd = tun_create_by_id(name, sizeof(name), id, mq);
    } else {
-        fd = tun_create_by_name(name, len, dev_name);
+        fd = tun_create_by_name(name, sizeof(name), dev_name, mq);
    }

+    if (fd!=-1 && ret_name)
+        *ret_name = strdup(name);
+
    return fd;
 }

-int
-tun_read(int fd, void *data, size_t size)
+ssize_t tun_read (int fd, void *data, size_t size)
 {
    if (!size)
-        return 0;
+        return -1;

 #ifdef GT_BSD_TUN
    uint32_t family;

    struct iovec iov[2] = {
-        {
-            .iov_base = &family,
-            .iov_len = sizeof(family),
-        },
-        {
-            .iov_base = data,
-            .iov_len = size,
-        },
+        { .iov_base = &family, .iov_len = sizeof(family) },
+        { .iov_base = data, .iov_len = size }
    };

-    int ret = (int)readv(fd, iov, 2);
+    ssize_t ret = readv(fd, iov, 2);
+#else
+    ssize_t ret = read(fd, data, size);
+#endif

-    if (ret <= 0)
-        return ret;
+    if (ret==-1) {
+        if (errno==EAGAIN || errno==EINTR)
+            return -1;

-    if ((size_t)ret <= sizeof(family))
+        if (errno)
+            perror("tun read");
+
+        return 0;
+    }
+
+#ifdef GT_BSD_TUN
+    if (ret<(ssize_t) sizeof(family))
        return 0;

-    return ret - (int)sizeof(family);
+    return ret-sizeof(family);
 #else
-    return (int)read(fd, data, size);
+    return ret;
 #endif
 }

-int
-tun_write(int fd, const void *data, size_t size)
+ssize_t tun_write (int fd, const void *data, size_t size)
 {
    if (!size)
-        return 0;
+        return -1;

 #ifdef GT_BSD_TUN
    uint32_t family;

-    switch (ip_get_version(data, (int)size)) {
+    switch (ip_get_version(data, size)) {
    case 4:
        family = htonl(AF_INET);
        break;
@@ -225,42 +208,35 @@ tun_write(int fd, const void *data, size_t size)
        family = htonl(AF_INET6);
        break;
    default:
-        errno = EINVAL;
        return -1;
    }

    struct iovec iov[2] = {
-        {
-            .iov_base = &family,
-            .iov_len = sizeof(family),
-        },
-        {
-            .iov_base = (void *)data,
-            .iov_len = size,
-        },
+        { .iov_base = &family, .iov_len = sizeof(family) },
+        { .iov_base = (void *) data, .iov_len = size },
    };

-    int ret = (int)writev(fd, iov, 2);
+    ssize_t ret = writev(fd, iov, 2);
+#else
+    ssize_t ret = write(fd, data, size);
+#endif

-    if (ret <= 0)
-        return ret;
+    if (ret==-1) {
+        if (errno==EAGAIN || errno==EINTR)
+            return -1;

-    if ((size_t)ret <= sizeof(family))
+        if (errno)
+            perror("tun write");
+
+        return 0;
+    }
+
+#ifdef GT_BSD_TUN
+    if (ret<(ssize_t) sizeof(family))
        return 0;

-    return ret - (int)sizeof(family);
+    return ret-sizeof(family);
 #else
-    return (int)write(fd, data, size);
-#endif
-}
-
-int
-tun_set_persist(int fd, int on)
-{
-#ifdef TUNSETPERSIST
-    return ioctl(fd, TUNSETPERSIST, on);
-#else
-    errno = ENOSYS;
-    return -1;
+    return ret;
 #endif
 }
--- a/src/tun.h
+++ b/src/tun.h
@@ -1,6 +1,7 @@
 #pragma once

-int tun_create      (char *, size_t, const char *);
-int tun_read        (int, void *, size_t);
-int tun_write       (int, const void *, size_t);
-int tun_set_persist (int, int);
+#include <unistd.h>
+
+int     tun_create (char *, char **, int);
+ssize_t tun_read   (int, void *, size_t);
+ssize_t tun_write  (int, const void *, size_t);
--- a/systemd/glorytun-client.network
+++ b/systemd/glorytun-client.network
@@ -1,10 +0,0 @@
-[Match]
-Name=gtc-*
-
-[Network]
-Description=Glorytun client device
-DHCP=ipv4
-
-[DHCP]
-CriticalConnection=yes
-RouteTable=200
--- a/systemd/glorytun-run
+++ b/systemd/glorytun-run
@@ -1,6 +0,0 @@
-#!/bin/sh
-
-exec glorytun bind "$@" \
-	$BIND $BIND_PORT \
-	${DEV:+dev "$DEV"} \
-	${HOST:+to "$HOST" "$PORT"}
--- a/systemd/glorytun-setup
+++ b/systemd/glorytun-setup
@@ -1,75 +0,0 @@
-#!/bin/sh
-
-set -e
-
-_ask() {
-	printf "%s: " "$1"
-	read -r "$2"
-}
-
-_ask "Config filename (tun0)" NAME
-NAME=${NAME:-tun0}
-DIR="/etc/glorytun/$NAME"
-
-if [ -d "$DIR" ]; then
-	echo "This config already exit!"
-	exit 1
-fi
-
-_ask "Server ip (enter for server conf)" HOST
-if [ -z "$HOST" ]; then
-	_ask "Bind to port (5000)" BIND_PORT
-	BIND_PORT=${BIND_PORT:-5000}
-else
-	_ask "Server port (5000)" PORT
-	PORT=${PORT:-5000}
-fi
-
-BIND=0.0.0.0
-case "$HOST" in
-	*:*) BIND=::
-esac
-
-_ask "Server key (enter to generate a new one)" KEY
-if [ -z "$KEY" ]; then
-	KEY=$(glorytun keygen)
-	echo "Your new key: $KEY"
-fi
-
-# install files
-mkdir -p "$DIR"
-
-cat > "$DIR/env" <<EOF
-DEV=gt${HOST:+c}-$NAME
-HOST=$HOST
-PORT=$PORT
-BIND=$BIND
-BIND_PORT=$BIND_PORT
-OPTIONS=
-EOF
-
-( umask 077; echo "$KEY" > "$DIR/key" )
-
-[ "$HOST" ] && cat > "$DIR/post.sh" <<'EOF'
-#!/bin/sh
-
-PREF=32765
-TABLE=200
-
-# keep the current route to HOST
-SRC=$(ip route get "$HOST" | awk '/src/{getline;print $0}' RS=' ')
-ip rule add from "$SRC" table main pref "$((PREF-1))" || true
-
-# limit to 100Mbit by default
-glorytun path up "$SRC" dev "$DEV" rate rx 12500000 tx 12500000
-
-# forward everything else to the tunnel
-ip rule add from all table "$TABLE" pref "$PREF" || true
-EOF
-[ -f "$DIR/post.sh" ] && chmod u+x "$DIR/post.sh"
-
-# start services
-_ask "Start glorytun now ? (enter to skip)" START
-case "$START" in y*|Y*)
-	systemctl start glorytun@"$NAME" ;;
-esac
--- a/systemd/glorytun.network
+++ b/systemd/glorytun.network
@@ -1,14 +0,0 @@
-[Match]
-Name=gt-*
-
-[Network]
-Description=Glorytun server device
-Address=0.0.0.0/24
-DHCPServer=yes
-IPMasquerade=yes
-
-[DHCPServer]
-PoolOffset=2
-PoolSize=1
-EmitDNS=yes
-DNS=9.9.9.9
--- a/systemd/glorytun@.service.in
+++ b/systemd/glorytun@.service.in
@@ -1,14 +0,0 @@
-[Unit]
-Description=Glorytun on %I
-After=network.target
-
-[Service]
-Type=simple
-Restart=always
-EnvironmentFile=/etc/glorytun/%i/env
-ExecStart=@bindir@/glorytun-run keyfile /etc/glorytun/%i/key $OPTIONS
-ExecStartPost=-/etc/glorytun/%i/post.sh
-CapabilityBoundingSet=CAP_NET_ADMIN
-
-[Install]
-WantedBy=multi-user.target
--- a/version.sh
+++ b/version.sh
@@ -1,15 +1,13 @@
 #!/bin/sh

-export GIT_DIR=.git
-export GIT_WORK_TREE=.
+[ -z "${VERSION}" ] && VERSION=`git describe --tags --match='v[0-9].*' 2>/dev/null` \
+                    && VERSION=${VERSION#v}

-[ -z "$VERSION" ] && VERSION="$(git describe --tags --match='v[0-9].*' 2>/dev/null)" \
-                  && VERSION="${VERSION#v}"
+[ -z "${VERSION}" ] && VERSION=`cat VERSION 2>/dev/null`

-[ -z "$VERSION" ] && VERSION="$(git rev-parse HEAD 2>/dev/null)"
+[ -z "${VERSION}" ] && VERSION=0.0.0

-[ -z "$VERSION" ] && VERSION="$(cat VERSION 2>/dev/null)"
+[ "$1" = "major"  ] && printf ${VERSION%%.*} \
+                    && exit 0

-[ -z "$VERSION" ] && VERSION="0.0.0"
-
-printf "%s" "$VERSION" | tee VERSION
+printf ${VERSION} | tee VERSION