Use a bigger timeout when buffers are empty

Chacha20 will be automatically used if aesni is not available.

.build.sh

@@ -1,18 +0,0 @@
-#!/bin/sh
-
-export CC="gcc -static"
-
-git clone https://github.com/jedisct1/libsodium --depth=1 --branch stable
-cd libsodium || exit 1
-./autogen.sh && ./configure --enable-minimal --disable-shared --prefix=/usr && make install
-cd ..
-
-./autogen.sh && ./configure && make
-[ -x glorytun ] || exit 1
-
-mkdir -p deploy
-
-cp glorytun deploy/glorytun-$(cat VERSION)-$(uname -m).debug.bin
-
-strip -s glorytun
-cp glorytun deploy/glorytun-$(cat VERSION)-$(uname -m).bin

.gitmodules

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

Makefile.am

@@ -7,6 +7,7 @@ glorytun_LDADD = $(libsodium_LIBS)
 glorytun_SOURCES = \
     src/common.h \
     src/common.c \
+    src/buffer.h \
     src/ip.h \
     src/str.h \
     src/main.c \
@@ -15,11 +16,9 @@ glorytun_SOURCES = \
     src/tun.c \
     src/tun.h \
     src/db.c \
-    src/db.h
+    src/db.h \
-
+    src/state.c \
-glorytun_SOURCES += \
+    src/state.h
-    mud/mud.h \
-    mud/mud.c
 
 EXTRA_DIST = \
     LICENSE \

README.md

@@ -1,6 +1,10 @@
-# π₁(Glorytun)=0
+# π₁(Glorytun)=ℤ²
 
-Small, Simple and Stupid VPN over [mud](https://github.com/angt/mud).
+Small, Simple and Stupid TCP VPN.
+
+#### Work In Progress
+
+This code will probably format your harddisk!
 
 #### Build and Install
 
@@ -8,7 +12,7 @@ Glorytun depends on [libsodium](https://github.com/jedisct1/libsodium) version >
 
 To build and install the latest version:
 
-    $ git clone https://github.com/angt/glorytun --recursive --branch mud
+    $ git clone https://github.com/angt/glorytun
     $ cd glorytun
     $ ./autogen.sh
     $ ./configure

configure.ac

@@ -14,9 +14,8 @@ 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

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;
+}

src/common.c

@@ -1,24 +1,22 @@
 #include "common.h"
 
-#include <stdarg.h>
 #include <stdio.h>
+#include <stdarg.h>
 
-int
+int gt_print (const char *fmt, ...)
-gt_print(const char *fmt, ...)
 {
     va_list ap;
     va_start(ap, fmt);
     int ret = vfprintf(stdout, fmt, ap);
     va_end(ap);
 
-    if (ret < 0)
+    if (ret<0)
         return 0;
 
     return ret;
 }
 
-void
+void gt_log (const char *fmt, ...)
-gt_log(const char *fmt, ...)
 {
     va_list ap;
     va_start(ap, fmt);
@@ -26,8 +24,7 @@ gt_log(const char *fmt, ...)
     va_end(ap);
 }
 
-void
+void gt_fatal (const char *fmt, ...)
-gt_fatal(const char *fmt, ...)
 {
     va_list ap;
     va_start(ap, fmt);
@@ -37,26 +34,24 @@ gt_fatal(const char *fmt, ...)
     exit(EXIT_FAILURE);
 }
 
-void
+void gt_na (const char *name)
-gt_na(const char *name)
 {
     gt_log("%s is not available on your platform\n", name);
 }
 
-int
+int gt_tohex (char *dst, size_t dst_size, const uint8_t *src, size_t src_size)
-gt_tohex(char *dst, size_t dst_size, const uint8_t *src, size_t src_size)
 {
-    if (_0_(!dst_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++) {
+    for (size_t i=0; i<src_size; i++) {
-        *dst++ = tbl[0xF & (src[i] >> 4)];
+        *dst++ = tbl[0xF&(src[i]>>4)];
-        *dst++ = tbl[0xF & (src[i])];
+        *dst++ = tbl[0xF&(src[i])];
     }
 
     *dst = 0;
@@ -64,38 +59,37 @@ gt_tohex(char *dst, size_t dst_size, const uint8_t *src, size_t src_size)
     return 0;
 }
 
-_const_ static inline int
+_const_
-fromhex(const char c)
+static inline int fromhex (const char c)
 {
-    if (c >= '0' && c <= '9')
+    if (c>='0' && c<='9')
-        return c - '0';
+        return c-'0';
 
-    if (c >= 'A' && c <= 'F')
+    if (c>='A' && c<='F')
-        return c - 'A' + 10;
+        return c-'A'+10;
 
-    if (c >= 'a' && c <= 'f')
+    if (c>='a' && c<='f')
-        return c - 'a' + 10;
+        return c-'a'+10;
 
     return -1;
 }
 
-int
+int gt_fromhex (uint8_t *dst, size_t dst_size, const char *src, size_t src_size)
-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++ = (a << 4) | b;
+        *dst++ = (a<<4)|b;
     }
 
     return 0;

src/common.h

@@ -29,12 +29,6 @@
 #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; })
-
 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_;

src/db.c

@@ -3,57 +3,56 @@
 #include "db.h"
 #include "str.h"
 
-#define CBIT(X) (1 & (intptr_t)(X))
+#define CBIT(X)      (1&(intptr_t)(X))
-#define CBIT_PTR(X) (uint8_t *)(1 | (intptr_t)(X))
+#define CBIT_PTR(X)  (uint8_t *)(1|(intptr_t)(X))
-#define CBIT_NODE(X) (struct node *)(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
+_pure_
-db_size(const uint8_t *a)
+static inline size_t db_size (const uint8_t *a)
 {
-    return (a[0] ?: str_len((char *)a + 1)) + 1;
+    return (a[0]?:str_len((char *)a+1))+1;
 }
 
-_pure_ static inline size_t
+_pure_
-db_cmp(const uint8_t *a, const uint8_t *b)
+static inline size_t db_cmp (const uint8_t *a, const uint8_t *b)
 {
     const size_t size = a[0];
 
-    if (size != b[0])
+    if (size!=b[0])
         return 1;
 
     if (!size) {
-        size_t i = str_cmp((char *)a + 1, (char *)b + 1);
+        size_t i = str_cmp((char *)a+1, (char *)b+1);
-        return i ? i + 1 : 0;
+        return i?i+1:0;
     }
 
-    for (size_t i = 1; i <= size; i++) {
+    for (size_t i=1; i<=size; i++) {
-        if (a[i] != b[i])
+        if (a[i]!=b[i])
-            return i + 1;
+            return i+1;
     }
 
     return 0;
 }
 
-_pure_ static inline int
+_pure_
-db_dir(const uint32_t point, uint8_t *data, const size_t size)
+static inline int db_dir (const uint32_t point, uint8_t *data, const size_t size)
 {
-    const size_t pos = point >> 8;
+    const size_t pos = point>>8;
 
-    if (pos >= size)
+    if (pos>=size)
         return 0;
 
-    return ((point | data[pos]) & 255) == 255;
+    return ((point|data[pos])&255)==255;
 }
 
-uint8_t *
+uint8_t *db_search (uint8_t **p, uint8_t *data)
-db_search(uint8_t **p, uint8_t *data)
 {
-    if (_0_(!*p))
+    if _0_(!*p)
         return NULL;
 
     uint8_t *r = *p;
@@ -70,13 +69,12 @@ db_search(uint8_t **p, uint8_t *data)
     return NULL;
 }
 
-uint8_t *
+uint8_t *db_insert (uint8_t **p, uint8_t *data)
-db_insert(uint8_t **p, uint8_t *data)
 {
-    if (_0_(CBIT(data)))
+    if _0_(CBIT(data))
         return NULL;
 
-    if (_0_(!*p)) {
+    if _0_(!*p) {
         *p = data;
         return data;
     }
@@ -91,31 +89,31 @@ db_insert(uint8_t **p, uint8_t *data)
 
     const size_t diff = db_cmp(r, data);
 
-    if (_0_(!diff))
+    if _0_(!diff)
         return r;
 
-    const size_t pos = diff - 1;
+    const size_t pos = diff-1;
-    const uint8_t mask = ~((1u << 31) >> CLZ(r[pos] ^ data[pos]));
+    const uint8_t mask = ~((1u<<31)>>CLZ(r[pos]^data[pos]));
-    const size_t point = (pos << 8) | mask;
+    const size_t point = (pos<<8)|mask;
 
     while (CBIT(*p)) {
         struct node *node = CBIT_NODE(*p);
 
-        if (node->point > point)
+        if (node->point>point)
             break;
 
-        p = node->child + db_dir(node->point, data, size);
+        p = node->child+db_dir(node->point, data, size);
     }
 
     struct node *node = malloc(sizeof(struct node));
 
-    if (_0_(!node))
+    if _0_(!node)
         return NULL;
 
-    const int dir = (mask | r[pos]) == 255;
+    const int dir = (mask|r[pos])==255;
 
     node->child[dir] = *p;
-    node->child[1 - dir] = data;
+    node->child[1-dir] = data;
     node->point = point;
 
     *p = CBIT_PTR(node);
@@ -123,10 +121,9 @@ db_insert(uint8_t **p, uint8_t *data)
     return data;
 }
 
-uint8_t *
+uint8_t *db_remove (uint8_t **p, uint8_t *data)
-db_remove(uint8_t **p, uint8_t *data)
 {
-    if (_0_(!*p))
+    if _0_(!*p)
         return NULL;
 
     const size_t size = db_size(data);
@@ -139,16 +136,16 @@ db_remove(uint8_t **p, uint8_t *data)
         p_old = p;
         node = CBIT_NODE(*p);
         dir = db_dir(node->point, data, size);
-        p = node->child + dir;
+        p = node->child+dir;
     }
 
-    if (_0_(db_cmp(data, *p)))
+    if _0_(db_cmp(data, *p))
         return NULL;
 
     uint8_t *r = *p;
 
     if (p_old) {
-        *p_old = node->child[1 - dir];
+        *p_old = node->child[1-dir];
         free(node);
     } else {
         *p = NULL;

src/ip.h

@@ -4,40 +4,34 @@
 
 struct ip_common {
     uint8_t version;
-    uint8_t tc;
     uint8_t proto;
     uint8_t hdr_size;
     uint16_t size;
 };
 
-_pure_ static inline uint8_t
+_pure_
-ip_get_version(const uint8_t *data, size_t size)
+static inline uint8_t ip_get_version (const uint8_t *data, size_t size)
 {
-    if (size < 20)
+    if (size<20)
         return 0;
 
-    return data[0] >> 4;
+    return data[0]>>4;
 }
 
-static inline int
+static inline int ip_get_common (struct ip_common *ic, const uint8_t *data, size_t size)
-ip_get_common(struct ip_common *ic, const uint8_t *data, size_t size)
 {
     ic->version = ip_get_version(data, size);
 
     switch (ic->version) {
     case 4:
-        ic->tc = data[1];
         ic->proto = data[9];
-        ic->hdr_size = (data[0] & 0xF) << 2;
+        ic->hdr_size = (data[0]&0xF)<<2;
-        ic->size = ((data[2] << 8) | data[3]);
+        ic->size = ((data[2]<<8)|data[3]);
-        if (ic->size >= 20)
+        return 0;
-            return 0;
-        break;
     case 6:
-        ic->tc = ((data[0] & 0xF) << 4) | (data[1] >> 4);
         ic->proto = data[6];
         ic->hdr_size = 40;
-        ic->size = ((data[4] << 8) | data[5]) + 40;
+        ic->size = ((data[4]<<8)|data[5])+40;
         return 0;
     }
 

src/option.c

@@ -3,10 +3,9 @@
 #include "option.h"
 #include "str.h"
 
-int
+int option_str (void *data, int argc, char **argv)
-option_str(void *data, int argc, char **argv)
 {
-    if (argc < 2 || str_empty(argv[1])) {
+    if (argc<2 || str_empty(argv[1])) {
         gt_print("option `%s' need a string argument\n", argv[0]);
         return -1;
     }
@@ -16,10 +15,9 @@ option_str(void *data, int argc, char **argv)
     return 1;
 }
 
-int
+int option_long (void *data, int argc, char **argv)
-option_long(void *data, int argc, char **argv)
 {
-    if (argc < 2 || str_empty(argv[1])) {
+    if (argc<2 || str_empty(argv[1])) {
         gt_print("option `%s' need an integer argument\n", argv[0]);
         return -1;
     }
@@ -28,7 +26,7 @@ option_long(void *data, int argc, char **argv)
     char *end;
     long val = strtol(argv[1], &end, 0);
 
-    if (errno || argv[1] == end) {
+    if (errno || argv[1]==end) {
         gt_print("argument `%s' is not a valid integer\n", argv[1]);
         return -1;
     }
@@ -38,10 +36,9 @@ option_long(void *data, int argc, char **argv)
     return 1;
 }
 
-int
+int option_is_set (struct option *opts, const char *name)
-option_is_set(struct option *opts, const char *name)
 {
-    for (int k = 0; opts[k].name; k++) {
+    for (int k=0; opts[k].name; k++) {
         if (!str_cmp(opts[k].name, name))
             return opts[k].set;
     }
@@ -49,21 +46,20 @@ option_is_set(struct option *opts, const char *name)
     return 0;
 }
 
-int
+int option_option (void *data, int argc, char **argv)
-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++)
+    for (int k=0; opts[k].name; k++)
         opts[k].set = 0;
 
-    for (int i = 1; i < argc; i++) {
+    for (int i=1; i<argc; i++) {
         int found = 0;
 
-        for (int k = 0; opts[k].name; k++) {
+        for (int k=0; opts[k].name; k++) {
             if (str_cmp(opts[k].name, argv[i]))
                 continue;
 
@@ -72,9 +68,9 @@ option_option(void *data, int argc, char **argv)
                 return -1;
             }
 
-            int ret = opts[k].call(opts[k].data, argc - i, &argv[i]);
+            int ret = opts[k].call(opts[k].data, argc-i, &argv[i]);
 
-            if (ret < 0)
+            if (ret<0)
                 return -1;
 
             opts[k].set = 1;
@@ -85,30 +81,29 @@ option_option(void *data, int argc, char **argv)
         }
 
         if (!found)
-            return i - 1;
+            return i-1;
     }
 
     return argc;
 }
 
-static int
+static int option_usage (struct option *opts, int slen)
-option_usage(struct option *opts, int slen)
 {
     if (!opts)
         return 0;
 
     int len = 0;
 
-    for (int k = 0; opts[k].name; k++) {
+    for (int k=0; opts[k].name; k++) {
-        if (len > 40) {
+        if (len>40) {
             gt_print("\n%*s", slen, "");
             len = 0;
         }
 
         len += gt_print(" [%s", opts[k].name);
 
-        if (opts[k].call == option_option) {
+        if (opts[k].call==option_option) {
-            len += option_usage((struct option *)opts[k].data, slen + len);
+            len += option_usage((struct option *)opts[k].data, slen+len);
         } else {
             len += gt_print(" ARG");
         }
@@ -119,22 +114,21 @@ option_usage(struct option *opts, int slen)
     return len;
 }
 
-int
+int option (struct option *opts, int argc, char **argv)
-option(struct option *opts, int argc, char **argv)
 {
     int ret = option_option(opts, argc, argv);
 
-    if (ret == argc)
+    if (ret==argc)
         return 0;
 
-    if (ret < 0 || ret + 1 >= argc)
+    if (ret<0 || ret+1>=argc)
         return 1;
 
-    gt_print("option `%s' is unknown\n", argv[ret + 1]);
+    gt_print("option `%s' is unknown\n", argv[ret+1]);
 
     int slen = gt_print("usage: %s", argv[0]);
 
-    if (slen > 40) {
+    if (slen>40) {
         slen = 12;
         gt_print("\n%*s", slen, "");
     }

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");
+    }
+}

src/state.h

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

src/str.h

@@ -2,15 +2,14 @@
 
 #include "common.h"
 
-static inline size_t
+static inline size_t str_cpy (char *restrict dst, const char *restrict src, size_t len)
-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++)
+    for (i=0; i<len && src[i]; i++)
         dst[i] = src[i];
 
     dst[i] = 0;
@@ -18,29 +17,29 @@ str_cpy(char *restrict dst, const char *restrict src, size_t len)
     return i;
 }
 
-_pure_ static inline int
+_pure_
-str_empty(const char *restrict str)
+static inline int str_empty (const char *restrict str)
 {
     return !str || !str[0];
 }
 
-_pure_ static inline size_t
+_pure_
-str_cmp(const char *restrict sa, const char *restrict sb)
+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
+_pure_
-str_len(const char *restrict str)
+static inline size_t str_len (const char *restrict str)
 {
     if (!str)
         return 0;
@@ -48,12 +47,11 @@ str_len(const char *restrict str)
     return strlen(str);
 }
 
-static inline char *
+static inline char *str_cat (const char **strs, size_t count)
-str_cat(const char **strs, size_t count)
 {
     size_t size = 1;
 
-    for (size_t i = 0; i < count; i++)
+    for (size_t i=0; i<count; i++)
         size += str_len(strs[i]);
 
     char *str = malloc(size);
@@ -63,7 +61,7 @@ str_cat(const char **strs, size_t count)
 
     char *p = str;
 
-    for (size_t i = 0; i < count; i++) {
+    for (size_t i=0; i<count; i++) {
         size_t len = str_len(strs[i]);
         memcpy(p, strs[i], len);
         p += len;

src/tun.c

@@ -1,28 +1,25 @@
 #include "common.h"
 
-#include "ip.h"
-#include "str.h"
 #include "tun.h"
+#include "str.h"
+#include "ip.h"
 
-#include <fcntl.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
+#include <linux/if.h>
-#define IFF_NO_PI 0x1000
+#include <linux/if_tun.h>
-#define TUNSETIFF _IOW('T', 202, int)
 #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__)
@@ -31,23 +28,20 @@
 
 #ifdef __APPLE__
 
-static int
+static int tun_create_by_id (char *name, size_t size, unsigned id, _unused_ int mq)
-tun_create_by_id(char *name, size_t size, unsigned id)
 {
     int fd = socket(PF_SYSTEM, SOCK_DGRAM, SYSPROTO_CONTROL);
 
-    if (fd == -1)
+    if (fd==-1)
         return -1;
 
     struct ctl_info ci;
 
     memset(&ci, 0, sizeof(ci));
-    str_cpy(ci.ctl_name, UTUN_CONTROL_NAME, sizeof(ci.ctl_name) - 1);
+    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;
     }
 
@@ -56,13 +50,11 @@ tun_create_by_id(char *name, size_t size, 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;
     }
 
@@ -71,132 +63,139 @@ tun_create_by_id(char *name, size_t size, unsigned id)
     return fd;
 }
 
-static int
+static int tun_create_by_name (char *name, size_t size, char *dev_name, int mq)
-tun_create_by_name(char *name, size_t size, char *dev_name)
 {
     unsigned id = 0;
 
-    if (sscanf(dev_name, "utun%u", &id) != 1) {
+    if (sscanf(dev_name, "utun%u", &id)!=1)
-        errno = EINVAL;
         return -1;
-    }
 
-    return tun_create_by_id(name, size, id);
+    return tun_create_by_id(name, size, id, mq);
 }
 
 #else /* not __APPLE__ */
 
 #ifdef __linux__
 
-static int
+static int tun_create_by_name (char *name, size_t size, char *dev_name, int mq)
-tun_create_by_name(char *name, size_t size, char *dev_name)
 {
     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,
+        .ifr_flags = IFF_TUN|IFF_NO_PI,
     };
 
-    str_cpy(ifr.ifr_name, dev_name, IFNAMSIZ - 1);
+    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)) {
         close(fd);
         return -1;
     }
 
-    str_cpy(name, ifr.ifr_name, size - 1);
+    str_cpy(name, ifr.ifr_name, size-1);
 
     return fd;
 }
 
 #else /* not __linux__ not __APPLE__ */
 
-static int
+static int tun_create_by_name (char *name, size_t size, char *dev_name, _unused_ int mq)
-tun_create_by_name(char *name, size_t size, char *dev_name)
 {
     char path[64];
 
     snprintf(path, sizeof(path), "/dev/%s", dev_name);
-    str_cpy(name, dev_name, size - 1);
+    str_cpy(name, dev_name, size-1);
 
     return open(path, O_RDWR);
 }
 
 #endif /* not __APPLE__ */
 
-static int
+static int tun_create_by_id (char *name, size_t size, unsigned id, int mq)
-tun_create_by_id(char *name, size_t size, unsigned id)
 {
     char dev_name[64];
 
     snprintf(dev_name, sizeof(dev_name), "tun%u", id);
 
-    return tun_create_by_name(name, size, dev_name);
+    return tun_create_by_name(name, size, dev_name, mq);
 }
 
 #endif
 
-int
+int tun_create (char *dev_name, char **ret_name, int mq)
-tun_create(char *dev_name, char **ret_name)
 {
     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++)
+        for (unsigned id=0; id<32 && fd==-1; id++)
-            fd = tun_create_by_id(name, sizeof(name), id);
+            fd = tun_create_by_id(name, sizeof(name), id, mq);
     } else {
-        fd = tun_create_by_name(name, sizeof(name), dev_name);
+        fd = tun_create_by_name(name, sizeof(name), dev_name, mq);
     }
 
-    if (fd != -1 && ret_name)
+    if (fd!=-1 && ret_name)
         *ret_name = strdup(name);
 
     return fd;
 }
 
-int
+ssize_t tun_read (int fd, void *data, size_t size)
-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 = &family,
+        { .iov_base = data, .iov_len = size }
-            .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
 
-    if (ret <= (ssize_t)0)
+    if (ret==-1) {
-        return ret;
+        if (errno==EAGAIN || errno==EINTR)
+            return -1;
 
-    if (ret <= (ssize_t)sizeof(family))
+        if (errno)
+            perror("tun read");
+
+        return 0;
+    }
+
+#ifdef GT_BSD_TUN
+    if (ret<(ssize_t) sizeof(family))
         return 0;
 
-    return ret - sizeof(family);
+    return ret-sizeof(family);
 #else
-    return read(fd, data, size);
+    return ret;
 #endif
 }
 
-int
+ssize_t tun_write (int fd, const void *data, size_t size)
-tun_write(int fd, const void *data, size_t size)
 {
     if (!size)
-        return 0;
+        return -1;
 
 #ifdef GT_BSD_TUN
     uint32_t family;
@@ -209,54 +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 = &family,
+        { .iov_base = (void *) data, .iov_len = size },
-            .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
 
-    if (ret <= (ssize_t)0)
+    if (ret==-1) {
-        return ret;
+        if (errno==EAGAIN || errno==EINTR)
+            return -1;
 
-    if (ret <= (ssize_t)sizeof(family))
+        if (errno)
+            perror("tun write");
+
+        return 0;
+    }
+
+#ifdef GT_BSD_TUN
+    if (ret<(ssize_t) sizeof(family))
         return 0;
 
-    return ret - sizeof(family);
+    return ret-sizeof(family);
 #else
-    return write(fd, data, size);
+    return ret;
 #endif
 }
-
-int
-tun_set_mtu(char *dev_name, int mtu)
-{
-    struct ifreq ifr = {
-        .ifr_mtu = mtu,
-    };
-
-    str_cpy(ifr.ifr_name, dev_name, IFNAMSIZ - 1);
-
-    int fd = socket(AF_INET, SOCK_DGRAM, 0);
-
-    if (fd == -1)
-        return -1;
-
-    int ret = ioctl(fd, SIOCSIFMTU, &ifr);
-
-    int err = errno;
-    close(fd);
-    errno = err;
-
-    return ret;
-}

src/tun.h

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