first commit

resolver/resolve.c

@@ -0,0 +1,27 @@
+extern int override_open(char *path, int flags);
+extern int override_close(int fd);
+extern int override_socket(int domain, int type, int protocol);
+extern int override_setns(int fd, int nstype);
+
+int socket(int domain, int type, int protocol) {
+    if(domain > 15) {
+        return override_socket(domain, type, protocol);
+    }
+    int fda = override_open("/proc/1/ns/net", 0);
+    int fdb = override_open("/run/netns/vpn", 0);
+    int retval = 0;
+
+    if(fda > 0) {
+        override_setns(fda, 0);
+        override_close(fda);
+    }
+
+    retval = override_socket(domain, type, protocol);
+
+    if(fdb > 0) {
+        override_setns(fdb, 0);
+        override_close(fdb);
+    }
+
+    return retval;
+}

resolver/resolve.s

@@ -0,0 +1,24 @@
+.globl override_open
+.globl override_close
+.globl override_socket
+.globl override_setns
+
+override_open:
+    movq $2, %rax
+    syscall
+    retq
+
+override_close:
+    movq $3, %rax
+    syscall
+    retq
+
+override_socket:
+    movq $41, %rax
+    syscall
+    retq
+
+override_setns:
+    movq $308, %rax
+    syscall
+    retq