Add mtu option

This reverts commit 03cd87df1c.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "mud"]
+	path = mud
+	url = https://github.com/angt/mud.git

Makefile.am

@@ -16,7 +16,14 @@ glorytun_SOURCES = \
     src/tun.c \
     src/tun.h \
     src/db.c \
-    src/db.h
+    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 \

README.md

@@ -1,6 +1,6 @@
-# Glorytun
+# π₁(Glorytun)=ℤ²
 
-Small, Simple and Stupid TCP VPN.
+Small, Simple and Stupid VPN over [mud](https://github.com/angt/mud).
 
 #### Work In Progress
 
@@ -13,7 +13,7 @@ and needs an AES-NI capable CPU.
 
 To build and install the latest version:
 
-    $ git clone https://github.com/angt/glorytun
+    $ git clone https://github.com/angt/glorytun --recursive --branch mud
     $ cd glorytun
     $ ./autogen.sh
     $ ./configure

src/buffer.h

@@ -49,15 +49,18 @@ static inline size_t buffer_read_size (buffer_t *buffer)
 
 static inline void buffer_shift (buffer_t *buffer)
 {
+    if (buffer->read==buffer->data)
+        return;
+
     if (buffer->read==buffer->write) {
         buffer_format(buffer);
-    } else {
+        return;
-        const uint8_t *src = PALIGN_DOWN(buffer->read);
-        const size_t size = ALIGN(buffer->write-src);
-        if (buffer->data+size<src) {
-            memcpy(buffer->data, src, size);
-            buffer->read  -= src-buffer->data;
-            buffer->write -= src-buffer->data;
-        }
     }
+
+    const size_t size = buffer_read_size(buffer);
+
+    memmove(buffer->data, buffer->read, size);
+
+    buffer->read  = buffer->data;
+    buffer->write = buffer->data+size;
 }

src/state.c

@@ -0,0 +1,62 @@
+#include "common.h"
+
+#include "state.h"
+#include "str.h"
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+int state_create (const char *filename)
+{
+    if (str_empty(filename))
+        return -1;
+
+    int fd = open(filename, O_WRONLY);
+
+    if (fd==-1) {
+        if (errno!=EINTR)
+            perror("open");
+        return -1;
+    }
+
+    struct stat st = {0};
+
+    if (fstat(fd, &st)==-1) {
+        perror("fstat");
+        close(fd);
+        return -1;
+    }
+
+    if (!S_ISFIFO(st.st_mode)) {
+        gt_log("`%s' is not a fifo\n", filename);
+        close(fd);
+        return -1;
+    }
+
+    return fd;
+}
+
+void state_send (int fd, const char *state, const char *info)
+{
+    if (str_empty(state))
+        return;
+
+    if (fd==-1) {
+        gt_print("%s %s\n", state, info);
+        return;
+    }
+
+    const char *strs[] = { state, " ", info, "\n" };
+    char *str = str_cat(strs, COUNT(strs));
+
+    if (!str) {
+        perror("str_cat");
+        return;
+    }
+
+    if (write(fd, str, str_len(str))==-1 && errno!=EINTR)
+        perror("write");
+
+    free(str);
+}

src/state.h

@@ -0,0 +1,4 @@
+#pragma once
+
+int  state_create (const char *);
+void state_send   (int, const char *, const char *);

src/str.h

@@ -47,7 +47,7 @@ static inline size_t str_len (const char *restrict str)
     return strlen(str);
 }
 
-static inline char *str_cat (const char *const strs[], size_t count)
+static inline char *str_cat (const char **strs, size_t count)
 {
     size_t size = 1;
 

src/tun.c

@@ -131,9 +131,9 @@ static int tun_create_by_id (char *name, size_t size, unsigned id, int mq)
 
 #endif
 
-int tun_create (char *dev_name, int mq)
+int tun_create (char *dev_name, char **ret_name, int mq)
 {
-    char name[64];
+    char name[64] = {0};
     int fd = -1;
 
 #ifndef IFF_MULTI_QUEUE
@@ -148,8 +148,8 @@ int tun_create (char *dev_name, int mq)
         fd = tun_create_by_name(name, sizeof(name), dev_name, mq);
     }
 
-    if (fd!=-1)
+    if (fd!=-1 && ret_name)
-        gt_print("tun name: %s\n", name);
+        *ret_name = strdup(name);
 
     return fd;
 }

src/tun.h

@@ -2,6 +2,6 @@
 
 #include <unistd.h>
 
-int     tun_create (char *, int);
+int     tun_create (char *, char **, int);
 ssize_t tun_read   (int, void *, size_t);
 ssize_t tun_write  (int, const void *, size_t);

version.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-[ -z "${VERSION}" ] && VERSION=`git describe --tags --always 2>/dev/null` \
+[ -z "${VERSION}" ] && VERSION=`git describe --tags --match='v[0-9].*' 2>/dev/null` \
                     && VERSION=${VERSION#v}
 
 [ -z "${VERSION}" ] && VERSION=`cat VERSION 2>/dev/null`