Quit on tun error

This reverts commit 03cd87df1c.

.gitmodules

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

Makefile.am

@@ -20,6 +20,11 @@ glorytun_SOURCES = \
     src/state.c \
     src/state.h
 
+glorytun_CFLAGS  += -I$(srcdir)/mud
+glorytun_SOURCES += \
+    mud/mud.h \
+    mud/mud.c
+
 EXTRA_DIST = \
     LICENSE \
     README.md \

README.md

@@ -1,6 +1,6 @@
 # π₁(Glorytun)=ℤ²
 
-Small, Simple and Stupid TCP VPN.
+Small, Simple and Stupid VPN over [mud](https://github.com/angt/mud).
 
 #### Work In Progress
 
@@ -8,11 +8,12 @@ This code will probably format your harddisk!
 
 #### Build and Install
 
-Glorytun depends on [libsodium](https://github.com/jedisct1/libsodium) version >= 1.0.4.
+Glorytun depends on [libsodium](https://github.com/jedisct1/libsodium) version >= 1.0.4
+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/state.c

@@ -7,14 +7,16 @@
 #include <fcntl.h>
 #include <sys/stat.h>
 
-int state_create (const char *filename)
+static int state_fd = -1;
+
+int state_init (const char *filename)
 {
     if (str_empty(filename))
-        return -1;
+        return 0;
 
-    int fd = open(filename, O_WRONLY);
+    state_fd = open(filename, O_WRONLY);
 
-    if (fd==-1) {
+    if (state_fd==-1) {
         if (errno!=EINTR)
             perror("open");
         return -1;
@@ -22,41 +24,38 @@ int state_create (const char *filename)
 
     struct stat st = {0};
 
-    if (fstat(fd, &st)==-1) {
+    if (fstat(state_fd, &st)==-1) {
         perror("fstat");
-        close(fd);
+        close(state_fd);
+        state_fd = -1;
         return -1;
     }
 
     if (!S_ISFIFO(st.st_mode)) {
         gt_log("`%s' is not a fifo\n", filename);
-        close(fd);
+        close(state_fd);
+        state_fd = -1;
         return -1;
     }
 
-    return fd;
+    return 0;
 }
 
-void state_send (int fd, const char *state, const char *info)
+void state (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");
+    if (!str)
         return;
-    }
 
-    if (write(fd, str, str_len(str))==-1 && errno!=EINTR)
+    if (state_fd==-1) {
+        gt_print("%s", str);
+    } else {
+        if (write(state_fd, str, str_len(str))==-1 && errno!=EINTR)
             perror("write");
-
-    free(str);
+    }
 }

src/state.h

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