Update mud: losslimit per path

Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>

.github/workflows/build.yml

@@ -0,0 +1,24 @@
+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

.gitignore

@@ -1,4 +1,4 @@
-*.o
+*.[ios]
 *.log
 *.scan
 *.cache
@@ -10,4 +10,7 @@ configure
 build-aux
 .deps
 .dirstamp
+.static
 glorytun
+build*
+VERSION

.gitmodules

@@ -0,0 +1,8 @@
+[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

.travis.yml

@@ -24,7 +24,12 @@ deploy:
     api_key:
         secure: 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
     skip_cleanup: true
-    file: "glorytun-*.tar.gz"
+    file_glob: true
+    file: glorytun-*.tar.gz
     on:
         tags: true
         repo: angt/glorytun
+        condition: "${TRAVIS_OS_NAME}-${CC} == linux-gcc"
+
+after_deploy:
+    - md5sum glorytun-*.tar.gz

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2015, angt
+Copyright (c) 2015-2020, Adrien Gallouët <adrien@gallouet.fr>
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without

Makefile

@@ -0,0 +1,40 @@
+NAME    := glorytun
+VERSION := $(shell ./version.sh)
+DIST    := $(NAME)-$(VERSION)
+
+CC      ?= cc
+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 $(wildcard src/*.h)
+
+ifneq ($(CROSS),)
+    X = $(CROSS)-
+endif
+
+$(NAME): $(SRC) $(HDR)
+	$(Q)$(X)$(CC) $(FLAGS) -o $(NAME) $(SRC) -lsodium
+
+$(NAME)-strip: $(NAME)
+	$(Q)cp $< $@
+	$(Q)$(X)strip -x $@
+
+.PHONY: install
+install: $(NAME)-strip
+	@echo "$(DESTDIR)$(prefix)/bin/$(NAME)"
+	$(Q)install -m 755 -d $(DESTDIR)$(prefix)/bin
+	$(Q)install -m 755 $(NAME)-strip $(DESTDIR)$(prefix)/bin/$(NAME)
+
+.PHONY: clean
+clean:
+	$(Q)rm -f "$(NAME)"
+	$(Q)rm -f "$(DIST).tar.gz"

Makefile.am

@@ -5,18 +5,39 @@ bin_PROGRAMS = glorytun
 glorytun_CFLAGS = $(libsodium_CFLAGS)
 glorytun_LDADD = $(libsodium_LIBS)
 glorytun_SOURCES = \
-    src/common.h \
-    src/common-static.h \
+    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/ip-static.h \
+    src/common.h \
+    src/ctl.c \
+    src/ctl.h \
+    src/iface.c \
+    src/iface.h \
+    src/ip.h \
+    src/keygen.c \
     src/main.c \
-    src/option.c \
-    src/option.h \
+    src/path.c \
+    src/set.c \
+    src/show.c \
+    src/str.h \
     src/tun.c \
     src/tun.h
 
 EXTRA_DIST = \
     LICENSE \
+    Makefile \
     README.md \
+    VERSION \
     autogen.sh \
+    meson.build \
+    mud/LICENSE \
+    mud/README.md \
+    sodium.sh \
+    systemd \
     version.sh

README.md

@@ -1,22 +1,53 @@
 # Glorytun
 
-Small, Simple and Stupid **TCP** VPN.
+Glorytun is a small, simple and secure VPN over [mud](https://github.com/angt/mud).
 
-**Work In Progress:** Do not touch! This code will probably format your harddisk!
+Please visit the [wiki](https://github.com/angt/glorytun/wiki) for how-to guides, tutorials, etc.
 
-Glorytun depends on [libsodium](https://github.com/jedisct1/libsodium) version >= 1.0.4
-and needs an AES-NI capable CPU.
+## Compatibility
 
-To build and install the latest version:
+Glorytun only depends on [libsodium](https://github.com/jedisct1/libsodium) version >= 1.0.4.
+Which can be installed on a wide variety of systems.
 
-    $ git clone https://github.com/angt/glorytun
-    $ cd glorytun
-    $ ./autogen.sh
-    $ ./configure
-    $ make
-    # make 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.
 
-To create and use a new secret key:
+IPv4 and IPv6 are supported.
+On Linux you can have both at the same time by binding `::`.
 
-    $ dd if=/dev/urandom of=glorytun.key bs=32 count=1
-    # glorytun keyfile glorytun.key [...]
+## 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.
+
+---
+
+For feature requests and bug reports, please create an [issue](https://github.com/angt/glorytun/issues).

configure.ac

@@ -7,14 +7,15 @@ AC_INIT([glorytun],
 AC_CONFIG_SRCDIR([src/common.h])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
-AM_INIT_AUTOMAKE([1.9 -Wall -Werror foreign tar-ustar subdir-objects])
+AM_INIT_AUTOMAKE([1.12 -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

m4/pkg.m4

@@ -1,6 +1,6 @@
-dnl pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
-dnl serial 11 (pkg-config-0.29)
-dnl
+# pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
+# serial 12 (pkg-config-0.29.2)
+
 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])
+[m4_define([PKG_MACROS_VERSION], [0.29.2])
 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 $1])
+AC_MSG_CHECKING([for $2])
 
 _PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
 _PKG_CONFIG([$1][_LIBS], [libs], [$2])

meson.build

@@ -0,0 +1,62 @@
+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

sodium.sh

@@ -0,0 +1,29 @@
+#!/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))"

src/bench.c

@@ -0,0 +1,118 @@
+#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;
+}

src/bind.c

@@ -0,0 +1,368 @@
+#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,
+                                      req.path.loss_limit))
+                        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;
+}

src/common-static.h

@@ -1,142 +0,0 @@
-#pragma once
-
-#include "common.h"
-
-#include <unistd.h>
-#include <errno.h>
-
-static inline void byte_set (void *dst, const char value, size_t size)
-{
-    if (!dst)
-        return;
-
-    char *restrict d = dst;
-
-    while (size--)
-        *d++ = value;
-}
-
-static inline void byte_cpy (void *dst, const void *src, size_t size)
-{
-    if (!dst || !src)
-        return;
-
-    char *restrict d = dst;
-    const char *restrict s = src;
-
-    while (size--)
-        *d++ = *s++;
-}
-
-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;
-}
-
-static inline int str_cmp (const char *restrict sa, const char *restrict sb)
-{
-    if (!sa || !sb)
-        return 1;
-
-     while (*sa==*sb++)
-         if (!*sa++)
-             return 0;
-
-    return 1;
-}
-
-static inline size_t str_len (const char *restrict str)
-{
-    if (!str)
-        return 0;
-
-    size_t i = 0;
-
-    while (str[i])
-        i++;
-
-    return i;
-}
-
-static inline char *str_cat (const char *const 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]);
-        byte_cpy(p, strs[i], len);
-        p += len;
-    }
-
-    p[0] = 0;
-
-    return str;
-}
-
-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;
-}
-
-static inline size_t buffer_size (buffer_t *buffer)
-{
-    return buffer->end-buffer->data;
-}
-
-static inline size_t buffer_write_size (buffer_t *buffer)
-{
-    return buffer->end-buffer->write;
-}
-
-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->write) {
-        buffer_format(buffer);
-    } else {
-        const uint8_t *src = PALIGN_DOWN(buffer->read);
-        const size_t size = ALIGN(buffer->write-src);
-        if (buffer->data+size<src) {
-            byte_cpy(buffer->data, src, size);
-            buffer->read  -= src-buffer->data;
-            buffer->write -= src-buffer->data;
-        }
-    }
-}

src/common.c

@@ -1,40 +1,116 @@
 #include "common.h"
 
-#include <stdio.h>
 #include <stdarg.h>
+#include <stdio.h>
 
-int gt_print (const char *fmt, ...)
+void
+gt_log(const char *fmt, ...)
 {
     va_list ap;
     va_start(ap, fmt);
-    int ret = vfprintf(stdout, fmt, ap);
+    vfprintf(stderr, fmt, ap);
     va_end(ap);
+}
+
+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))
+        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])];
+    }
+
+    *dst = 0;
 
-    if (ret<0)
     return 0;
-
-    return ret;
 }
 
-void gt_log (const char *fmt, ...)
+_const_ static inline int
+fromhex(const char c)
 {
-    va_list ap;
-    va_start(ap, fmt);
-    vfprintf(stderr, fmt, ap);
-    va_end(ap);
+    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;
+
+    return -1;
 }
 
-void gt_fatal (const char *fmt, ...)
+int
+gt_fromhex(uint8_t *dst, size_t dst_size, const char *src, size_t src_size)
 {
-    va_list ap;
-    va_start(ap, fmt);
-    vfprintf(stderr, fmt, ap);
-    va_end(ap);
+    if (_0_(src_size & 1))
+        return -1;
 
-    exit(EXIT_FAILURE);
+    if (_0_(dst_size < (src_size / 2)))
+        return -1;
+
+    for (size_t i = 0; i < src_size; i += 2) {
+        const int a = fromhex(src[i]);
+        const int b = fromhex(src[i + 1]);
+
+        if (_0_(a == -1 || b == -1))
+            return -1;
+
+        *dst++ = (uint8_t)((a << 4) | b);
     }
 
-void gt_na (const char *name)
+    return 0;
+}
+
+void
+gt_set_port(struct sockaddr *sa, uint16_t port)
 {
-    gt_log("%s is not available on your platform!\n", name);
+    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;
 }

src/common.h

@@ -1,7 +1,25 @@
 #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]))
 
@@ -17,21 +35,40 @@
 #define _1_(x)         (__builtin_expect((x), 1))
 #define _0_(x)         (__builtin_expect((x), 0))
 
+#define CLZ(x)         (__builtin_clz(x))
+
 #define _printf_(A,B)  __attribute__ ((format(printf,A,B)))
 #define _noreturn_     __attribute__ ((noreturn))
 #define _unused_       __attribute__ ((unused))
+#define _pure_         __attribute__ ((pure))
+#define _const_        __attribute__ ((const))
 #define _align_(...)   __attribute__ ((aligned(__VA_ARGS__)))
 
-typedef struct buffer buffer_t;
+#undef MAX
+#define MAX(x,y) ({ __typeof__(x) X=(x); __typeof__(y) Y=(y); X > Y ? X : Y; })
 
-struct buffer {
-    uint8_t *data;
-    uint8_t *read;
-    uint8_t *write;
-    uint8_t *end;
-};
+#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 **);

src/ctl.c

@@ -0,0 +1,203 @@
+#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;
+}

src/ctl.h

@@ -0,0 +1,50 @@
+#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;
+            unsigned char loss_limit;
+        } 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);

src/iface.c

@@ -0,0 +1,39 @@
+#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;
+}

src/iface.h

@@ -0,0 +1,3 @@
+#pragma once
+
+int iface_set_mtu (const char *, size_t);

src/ip-static.h

@@ -1,39 +0,0 @@
-#pragma once
-
-#include <stdint.h>
-
-static inline int ip_get_version (const uint8_t *data, size_t size)
-{
-    if (size<20)   // XXX
-        return -1; // XXX
-
-    return data[0]>>4;
-}
-
-static inline void ip_set_size (uint8_t *data, size_t size)
-{
-    data[2] = 0xFF&(size>>8);
-    data[3] = 0xFF&(size);
-}
-
-static inline ssize_t ip_get_size (const uint8_t *data, size_t size)
-{
-    switch (ip_get_version(data, size)) {
-    case 4:
-        return (data[2]<<8)|data[3];
-    case -1:
-        return -1;
-    }
-
-    return 0;
-}
-
-static inline int ip_get_dscp (const uint8_t *data, size_t size)
-{
-    switch (ip_get_version(data, size)) {
-    case 4:
-        return data[1]>>2;
-    }
-
-    return 0;
-}

src/ip.h

@@ -0,0 +1,97 @@
+#pragma once
+
+#include <stdint.h>
+
+struct ip_common {
+    uint8_t tc;
+    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;
+};
+
+static inline int
+ip_read16(const uint8_t *src)
+{
+    return ((int)src[1]) | (((int)src[0]) << 8);
+}
+
+static inline uint8_t
+ip_get_version(const uint8_t *data, int size)
+{
+    if (size < 20)
+        return 0;
+
+    return data[0] >> 4;
+}
+
+static inline int
+ip_is_valid(const uint8_t *data, int size)
+{
+    switch (ip_get_version(data, size)) {
+        case 4: return size == ip_read16(&data[2]);
+        case 6: return size == ip_read16(&data[4]) + 40;
+    }
+
+    return 0;
+}
+
+static inline int
+ip_get_common(struct ip_common *ic, const uint8_t *data, int size)
+{
+    switch (ip_get_version(data, size)) {
+    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;
+    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;
+    }
+
+    return 1;
+}

src/keygen.c

@@ -0,0 +1,22 @@
+#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;
+}

src/option.c

@@ -1,142 +0,0 @@
-#include "common-static.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "option.h"
-
-int option_str (void *data, int argc, char **argv)
-{
-    if (argc<2 || !argv[1]) {
-        gt_print("option `%s' need a string argument\n", argv[0]);
-        return -1;
-    }
-
-    byte_cpy(data, &argv[1], sizeof(argv[1]));
-
-    return 1;
-}
-
-int option_long (void *data, int argc, char **argv)
-{
-    if (argc<2 || !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;
-    }
-
-    byte_cpy(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;
-}

src/option.h

@@ -1,15 +0,0 @@
-#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 **);

src/path.c

@@ -0,0 +1,237 @@
+#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"
+            "  losslim: %u\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 %u"
+            " %"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.loss_limit * 100 / 255,
+        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;
+    unsigned int loss_limit = 0;
+
+    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},
+        {"losslimit", "PERCENT", &loss_limit, argz_percent},
+        {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")
+           || argz_is_set(pathz, "losslimit");
+
+    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 (loss_limit)
+        req.path.loss_limit = loss_limit * 255 / 100;
+
+    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;
+}

src/set.c

@@ -0,0 +1,83 @@
+#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},
+        {"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;
+}

src/show.c

@@ -0,0 +1,161 @@
+#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;
+}

src/str.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include "common.h"
+
+_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)
+{
+    if (!sa || !sb)
+        return 1;
+
+    size_t i = 0;
+
+    while (sa[i] == sb[i])
+        if (!sa[i++])
+            return 0;
+
+    return i + 1;
+}
+
+_pure_ static inline size_t
+str_len(const char *restrict str, size_t len)
+{
+    if (!str)
+        return 0;
+
+    return strnlen(str, len);
+}

src/tun.c

@@ -1,82 +1,58 @@
-#include "common-static.h"
-#include "ip-static.h"
-
+#include "common.h"
+#include "ip.h"
+#include "str.h"
 #include "tun.h"
 
-#include <stdio.h>
 #include <fcntl.h>
-
+#include <stdio.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
 #include <sys/uio.h>
+#include <net/if.h>
 
 #ifdef __linux__
-# include <linux/if.h>
-# include <linux/if_tun.h>
+#define IFF_TUN 0x0001
+#define IFF_NO_PI 0x1000
+#define TUNSETIFF _IOW('T', 202, int)
+#define TUNSETPERSIST _IOW('T', 203, int)
 #endif
 
 #ifdef __APPLE__
-# include <sys/sys_domain.h>
-# include <sys/kern_control.h>
 #include <net/if_utun.h>
+#include <sys/kern_control.h>
+#include <sys/sys_domain.h>
 #endif
 
 #if defined(__APPLE__) || defined(__OpenBSD__)
-# define GT_BSD_TUN 1
+#define GT_BSD_TUN
 #endif
 
-#ifdef __linux__
-int tun_create (char *name, int multiqueue)
-{
-    int fd = open("/dev/net/tun", O_RDWR);
+#ifdef __APPLE__
 
-    if (fd<0) {
-        perror("open /dev/net/tun");
+static int
+tun_create_by_id(char *name, size_t len, unsigned id)
+{
+    int ret = snprintf(name, len, "utun%u", id);
+
+    if (ret <= 0 || (size_t)ret >= len) {
+        errno = EINVAL;
         return -1;
     }
 
-    struct ifreq ifr = {
-        .ifr_flags = IFF_TUN|IFF_NO_PI,
-    };
-
-    if (multiqueue) {
-#ifdef IFF_MULTI_QUEUE
-        ifr.ifr_flags |= IFF_MULTI_QUEUE;
-#else
-        gt_na("IFF_MULTI_QUEUE");
-#endif
-    }
-
-    str_cpy(ifr.ifr_name, name, IFNAMSIZ-1);
-
-    int ret = ioctl(fd, TUNSETIFF, &ifr);
-
-    if (ret<0) {
-        perror("ioctl TUNSETIFF");
-        return -1;
-    }
-
-    gt_log("tun name: %s\n", ifr.ifr_name);
-
-    return fd;
-}
-#elif defined(__APPLE__)
-int tun_create (_unused_ char *name, _unused_ int mq)
-{
-    for (unsigned dev_id = 0; dev_id < 32; dev_id++) {
-        struct ctl_info ci;
-
-        byte_set(&ci, 0, sizeof(ci));
-        str_cpy(ci.ctl_name, UTUN_CONTROL_NAME, sizeof(ci.ctl_name)-1);
-
     int fd = socket(PF_SYSTEM, SOCK_DGRAM, SYSPROTO_CONTROL);
 
     if (fd == -1)
         return -1;
 
-        if (ioctl(fd, CTLIOCGINFO, &ci)==-1) {
+    struct ctl_info ci = {
+        .ctl_name = UTUN_CONTROL_NAME,
+    };
+
+    if (ioctl(fd, CTLIOCGINFO, &ci)) {
+        int err = errno;
         close(fd);
-            continue;
+        errno = err;
+        return -1;
     }
 
     struct sockaddr_ctl sc = {
@@ -84,90 +60,164 @@ int tun_create (_unused_ char *name, _unused_ int mq)
         .sc_len = sizeof(sc),
         .sc_family = AF_SYSTEM,
         .ss_sysaddr = AF_SYS_CONTROL,
-            .sc_unit = dev_id+1,
+        .sc_unit = id + 1,
     };
 
-        if (connect(fd, (struct sockaddr *)&sc, sizeof(sc))==-1) {
+    if (connect(fd, (struct sockaddr *)&sc, sizeof(sc))) {
+        int err = errno;
         close(fd);
-            continue;
+        errno = err;
+        return -1;
     }
 
-        gt_log("tun name: /dev/utun%u\n", dev_id);
-
     return fd;
 }
 
+static int
+tun_create_by_name(char *name, size_t len, const char *dev_name)
+{
+    unsigned id = 0;
+
+    if (sscanf(dev_name, "utun%u", &id) != 1) {
+        errno = EINVAL;
         return -1;
     }
-#else
-int tun_create (_unused_ char *name, _unused_ int mq)
+
+    return tun_create_by_id(name, len, id);
+}
+
+#else /* not __APPLE__ */
+
+#ifdef __linux__
+
+static int
+tun_create_by_name(char *name, size_t len, const char *dev_name)
 {
-    for (unsigned dev_id = 0; dev_id < 32; dev_id++) {
-        char dev_path[11];
+    int ret = snprintf(name, len, "%s", dev_name);
 
-        snprintf(dev_path, sizeof(dev_path), "/dev/tun%u", dev_id);
+    if (ret <= 0 || (size_t)ret >= len) {
+        errno = EINVAL;
+        return -1;
+    }
 
-        int fd = open(dev_path, O_RDWR);
+    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)
-            continue;
+        return -1;
 
-        gt_log("tun name: %s\n", dev_path);
+    if (ioctl(fd, TUNSETIFF, &ifr)) {
+        int err = errno;
+        close(fd);
+        errno = err;
+        return -1;
+    }
 
     return fd;
 }
 
+#else /* not __linux__ not __APPLE__ */
+
+static int
+tun_create_by_name(char *name, size_t len, const char *dev_name)
+{
+    int ret = snprintf(name, len, "/dev/%s", dev_name);
+
+    if (ret <= 0 || (size_t)ret >= len) {
+        errno = EINVAL;
         return -1;
     }
+
+    return open(tmp, O_RDWR);
+}
+
+#endif /* not __APPLE__ */
+
+static int
+tun_create_by_id(char *name, size_t len, unsigned id)
+{
+    char tmp[64];
+    int ret = snprintf(tmp, sizeof(tmp), "tun%u", id);
+
+    if (ret <= 0 || (size_t)ret >= sizeof(tmp)) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    return tun_create_by_name(name, len, tmp);
+}
+
 #endif
 
-ssize_t tun_read (int fd, void *data, size_t size)
+int
+tun_create(char *name, size_t len, const char *dev_name)
+{
+    int fd = -1;
+
+    if (str_empty(dev_name)) {
+        for (unsigned id = 0; id < 32 && fd == -1; id++)
+            fd = tun_create_by_id(name, len, id);
+    } else {
+        fd = tun_create_by_name(name, len, dev_name);
+    }
+
+    return fd;
+}
+
+int
+tun_read(int fd, void *data, size_t size)
 {
     if (!size)
-        return -1;
+        return 0;
 
 #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,
+        },
     };
 
-    ssize_t ret = readv(fd, iov, 2);
-#else
-    ssize_t ret = read(fd, data, size);
-#endif
+    int ret = (int)readv(fd, iov, 2);
 
-    if (ret==-1) {
-        if (errno==EAGAIN || errno==EINTR)
-            return -1;
-
-        if (errno)
-            perror("tun read");
-
-        return 0;
-    }
-
-#ifdef GT_BSD_TUN
-    if (ret<(ssize_t) sizeof(family))
-        return 0;
-
-    return ret-sizeof(family);
-#else
+    if (ret <= 0)
         return ret;
+
+    if ((size_t)ret <= sizeof(family))
+        return 0;
+
+    return ret - (int)sizeof(family);
+#else
+    return (int)read(fd, data, size);
 #endif
 }
 
-ssize_t tun_write (int fd, const void *data, size_t size)
+int
+tun_write(int fd, const void *data, size_t size)
 {
     if (!size)
-        return -1;
+        return 0;
 
 #ifdef GT_BSD_TUN
     uint32_t family;
 
-    switch (ip_get_version(data, size)) {
+    switch (ip_get_version(data, (int)size)) {
     case 4:
         family = htonl(AF_INET);
         break;
@@ -175,35 +225,42 @@ ssize_t 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,
+        },
     };
 
-    ssize_t ret = writev(fd, iov, 2);
-#else
-    ssize_t ret = write(fd, data, size);
-#endif
+    int ret = (int)writev(fd, iov, 2);
 
-    if (ret==-1) {
-        if (errno==EAGAIN || errno==EINTR)
-            return -1;
-
-        if (errno)
-            perror("tun write");
-
-        return 0;
-    }
-
-#ifdef GT_BSD_TUN
-    if (ret<(ssize_t) sizeof(family))
-        return 0;
-
-    return ret-sizeof(family);
-#else
+    if (ret <= 0)
         return ret;
+
+    if ((size_t)ret <= sizeof(family))
+        return 0;
+
+    return ret - (int)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;
 #endif
 }

src/tun.h

@@ -1,7 +1,6 @@
 #pragma once
 
-#include <unistd.h>
-
-int     tun_create (char *, int);
-ssize_t tun_read   (int, void *, size_t);
-ssize_t tun_write  (int, const void *, size_t);
+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);

systemd/glorytun-client.network

@@ -0,0 +1,10 @@
+[Match]
+Name=gtc-*
+
+[Network]
+Description=Glorytun client device
+DHCP=ipv4
+
+[DHCP]
+CriticalConnection=yes
+RouteTable=200

systemd/glorytun-run

@@ -0,0 +1,6 @@
+#!/bin/sh
+
+exec glorytun bind "$@" \
+	$BIND $BIND_PORT \
+	${DEV:+dev "$DEV"} \
+	${HOST:+to "$HOST" "$PORT"}

systemd/glorytun-setup

@@ -0,0 +1,75 @@
+#!/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

systemd/glorytun.network

@@ -0,0 +1,14 @@
+[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

systemd/glorytun@.service.in

@@ -0,0 +1,14 @@
+[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

version.sh

@@ -1,9 +1,15 @@
 #!/bin/sh
 
-[ -z "${VERSION}" ] && VERSION=`git describe --tags --always 2>/dev/null` \
-                    && VERSION=${VERSION#v}
+export GIT_DIR=.git
+export GIT_WORK_TREE=.
 
-[ -z "${VERSION}" ] && VERSION=`basename \`pwd\`` \
-                    && VERSION=${VERSION#*-}
+[ -z "$VERSION" ] && VERSION="$(git describe --tags --match='v[0-9].*' 2>/dev/null)" \
+                  && VERSION="${VERSION#v}"
 
-printf ${VERSION}
+[ -z "$VERSION" ] && VERSION="$(git rev-parse HEAD 2>/dev/null)"
+
+[ -z "$VERSION" ] && VERSION="$(cat VERSION 2>/dev/null)"
+
+[ -z "$VERSION" ] && VERSION="0.0.0"
+
+printf "%s" "$VERSION" | tee VERSION