working commit

interface.cpp

@@ -270,6 +270,19 @@ std::expected<void, std::string> Interface::Down(void) {
         return {};
 }
 
+std::expected<std::string, std::string> Interface::Read() {
+        char buffer[mtu];
+        int rsize = 0;
+        if ((rsize = read(tunfd, buffer, sizeof(buffer))) < 0) {
+                int errnocopy = errno;
+                std::string error = std::strerror(errnocopy);
+                return std::unexpected("Read interface error: " + error);
+        }
+        std::string rdata;
+        rdata.append(buffer, rsize);
+        return rdata;
+}
+
 std::string Interface::Name() {
         return ifname;
 }
@@ -282,6 +295,7 @@ Interface::~Interface() {
         close(tunfd);
 }
 
+
 std::expected<void, std::string> Interface::UpN(void) {
         int netlinkfd = 0;
         if ((netlinkfd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE)) < 0) {
@@ -313,7 +327,6 @@ std::expected<void, std::string> Interface::UpN(void) {
         return {};
 }
 
-
 std::expected<void, std::string> Interface::SetIP4AddrMask(const std::string address, const int prefix) {
         int netlinkfd = 0;
         if ((netlinkfd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE)) < 0) {