Update mud

.build.sh

@@ -0,0 +1,15 @@
+#!/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
+strip -s glorytun
+mv glorytun deploy/glorytun-$(cat VERSION)-$(uname -m).bin

configure.ac

@@ -14,8 +14,9 @@ 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/ip.h

@@ -4,6 +4,7 @@
 
 struct ip_common {
     uint8_t version;
+    uint8_t tc;
     uint8_t proto;
     uint8_t hdr_size;
     uint16_t size;
@@ -24,11 +25,13 @@ static inline int ip_get_common (struct ip_common *ic, const uint8_t *data, size
 
     switch (ic->version) {
     case 4:
+        ic->tc = data[1];
         ic->proto = data[9];
         ic->hdr_size = (data[0]&0xF)<<2;
         ic->size = ((data[2]<<8)|data[3]);
         return 0;
     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;

src/main.c

@@ -245,12 +245,18 @@ int main (int argc, char **argv)
     char *keyfile = NULL;
     char *statefile = NULL;
 
+    long mtu = 1450;
+
     gt.timeout = 5000;
 
     long time_tolerance = 0;
 
     int v4 = 1;
-    int v6 = 1;
+    int v6 = 0;
+
+#ifdef __linux__
+    v6 = 1;
+#endif
 
     struct option opts[] = {
         { "host",           &host,           option_str    },
@@ -258,6 +264,7 @@ int main (int argc, char **argv)
         { "bind",           &bind_list,      option_str    },
         { "bind-port",      &bind_port,      option_long   },
         { "dev",            &dev,            option_str    },
+        { "mtu",            &mtu,            option_long   },
         { "keyfile",        &keyfile,        option_str    },
         { "multiqueue",     NULL,            option_option },
         { "statefile",      &statefile,      option_str    },
@@ -265,6 +272,7 @@ int main (int argc, char **argv)
         { "time-tolerance", &time_tolerance, option_long   },
         { "v4only",         NULL,            option_option },
         { "v6only",         NULL,            option_option },
+        { "chacha20",       NULL,            option_option },
         { "version",        NULL,            option_option },
         { NULL },
     };
@@ -277,13 +285,18 @@ int main (int argc, char **argv)
         return 0;
     }
 
-    if (option_is_set(opts, "v4only"))
+    if (option_is_set(opts, "v4only")) {
+        v4 = 1;
         v6 = 0;
+    }
 
-    if (option_is_set(opts, "v6only"))
+    if (option_is_set(opts, "v6only")) {
         v4 = 0;
+        v6 = 1;
+    }
 
-    if (!v4 && !v6) {
+    if (option_is_set(opts, "v4only") &&
+        option_is_set(opts, "v6only")) {
         gt_log("v4only and v6only are both set\n");
         return 1;
     }
@@ -314,7 +327,9 @@ int main (int argc, char **argv)
 
     fd_set_nonblock(tun_fd);
 
-    struct mud *mud = mud_create(bind_port, v4, v6);
+    int chacha = option_is_set(opts, "chacha20");
+
+    struct mud *mud = mud_create(bind_port, v4, v6, !chacha);
 
     if (!mud) {
         gt_log("couldn't create mud\n");
@@ -359,7 +374,18 @@ int main (int argc, char **argv)
     FD_ZERO(&rfds);
 
     int started = 0;
-    unsigned char buf[2048];
+
+    struct {
+        unsigned char *buf;
+    } send, recv;
+
+    send.buf = malloc(2*mtu);
+    recv.buf = malloc(mtu);
+
+    size_t send_size = 0;
+    size_t send_limit = 0;
+    int send_tc = 0;
+    int send_next_tc = 0;
 
     while (!gt.quit) {
         FD_SET(tun_fd, &rfds);
@@ -374,7 +400,7 @@ int main (int argc, char **argv)
             .tv_usec = 100000,
         };
 
-        if (mud_can_push(mud))
+        if (mud_can_push(mud) || send_size)
             timeout.tv_usec = 1000;
 
         if _0_(select(mud_fd+1, &rfds, NULL, NULL, &timeout)==-1) {
@@ -397,8 +423,8 @@ int main (int argc, char **argv)
         }
 
         if (FD_ISSET(tun_fd, &rfds)) {
-            while (1) {
-                const ssize_t r = tun_read(tun_fd, buf, sizeof(buf));
+            while (send_size<mtu) {
+                const ssize_t r = tun_read(tun_fd, send.buf+send_size, mtu);
 
                 if (r<=0) {
                     gt.quit |= !r;
@@ -407,27 +433,73 @@ int main (int argc, char **argv)
 
                 struct ip_common ic;
 
-                if (!ip_get_common(&ic, buf, sizeof(buf)) && ic.size==r)
-                    mud_send(mud, buf, r);
+                if (ip_get_common(&ic, send.buf+send_size, mtu) || ic.size!=r) {
+                    gt_log("packet dropped: malformed\n");
+                    continue;
+                }
+
+                send_size += r;
+
+                int update_tc = (ic.tc&0xFC)>(send_tc&0xFC);
+
+                if (send_size<=mtu) {
+                    send_limit = send_size;
+                    if ((ic.tc&0xFC)>(send_tc&0xFC))
+                        send_tc = ic.tc;
+                } else {
+                    if ((ic.tc&0xFC)>(send_next_tc&0xFC))
+                        send_next_tc = ic.tc;
+                }
             }
         }
 
-        mud_push(mud);
+        if (send_limit) {
+            int r = mud_send(mud, send.buf, send_limit, send_tc);
+            if (r==-1 && errno!=EAGAIN) {
+                perror("mud_send");
+            } else if (r==send_limit) {
+                if (send_size>send_limit)
+                    memmove(&send.buf[0], &send.buf[send_limit], send_size-send_limit);
+                send_size -= send_limit;
+                send_limit = send_size;
+                send_tc = send_next_tc;
+                send_next_tc = 0;
+            }
+        }
 
-        if (FD_ISSET(mud_fd, &rfds))
-            mud_pull(mud);
+        if (mud_push(mud)==-1 && errno!=EAGAIN)
+            perror("mud_push");
 
-        while (1) {
-            const int size = mud_recv(mud, buf, sizeof(buf));
+        if (FD_ISSET(mud_fd, &rfds)) {
+            if (mud_pull(mud)==-1 && errno!=EAGAIN)
+                perror("mud_pull");
+        }
 
-            if (size<=0)
+        while (!gt.quit) {
+            const int size = mud_recv(mud, recv.buf, mtu);
+
+            if (size<=0) {
+                if (size==-1 && errno!=EAGAIN)
+                    perror("mud_recv");
                 break;
+            }
 
-            const ssize_t r = tun_write(tun_fd, buf, size);
+            int p = 0;
 
-            if (r<=0) {
-                gt.quit |= !r;
-                break;
+            while (p<size) {
+                struct ip_common ic;
+
+                if (ip_get_common(&ic, recv.buf+p, size-p) || ic.size>size-p)
+                    break;
+
+                const ssize_t r = tun_write(tun_fd, recv.buf+p, ic.size);
+
+                if (r<=0) {
+                    gt.quit |= !r;
+                    break;
+                }
+
+                p += ic.size;
             }
         }
     }