fix

main.cpp

@@ -17,10 +17,11 @@ namespace po = boost::program_options;
 
 in_addr_t remote;
 auto cipher = (unsigned char *) "Mathematics is the art of giving the same name to different things.";
+auto cipher_length = strlen((char *) cipher);
 
 void encrypt_package(unsigned char *buffer, size_t length) {
     for (auto i = 0; i < length; i++) {
-        buffer[i] ^= cipher[i];
+        buffer[i] ^= cipher[i % cipher_length];
     }
 }
 
@@ -30,7 +31,7 @@ void inbound(int raw, int tun) {
     sockaddr_in address{.sin_family = AF_INET};
     socklen_t address_length;
     size_t packet_length;
-    while ((packet_length = recvfrom(raw, buffer, sizeof(buffer), 0, (sockaddr * ) & address, &address_length)) >= 0) {
+    while ((packet_length = recvfrom(raw, buffer, sizeof(buffer), 0, (sockaddr *) &address, &address_length)) >= 0) {
         auto *packet = (iphdr *) buffer;
         auto overhead = packet->ihl * 4;
         auto payload = buffer + overhead;
@@ -56,7 +57,7 @@ void outbound(int raw, int tun) {
     size_t packet_length;
     while ((packet_length = read(tun, buffer, sizeof(buffer))) >= 0) {
         encrypt_package(buffer, packet_length);
-        if (sendto(raw, buffer, packet_length, 0, (sockaddr * ) & address, sizeof(address)) < 0) {
+        if (sendto(raw, buffer, packet_length, 0, (sockaddr *) &address, sizeof(address)) < 0) {
             perror("outbound write");
         }
     }