X-Git-Url: https://git.llucax.com/z.facultad/75.74/practicos.git/blobdiff_plain/6758589f5ff68b1775d5a83b01d7ac49f1b612ef..659563a75d668130df84664e7e6b1220667cbc28:/practicas/pipi/src/ipin.cpp

diff --git a/practicas/pipi/src/ipin.cpp b/practicas/pipi/src/ipin.cpp
index c191b90..c8ea64e 100644
--- a/practicas/pipi/src/ipin.cpp
+++ b/practicas/pipi/src/ipin.cpp
@@ -16,12 +16,14 @@ IPIn::IPIn(const IPAddr& ip, Dev& dev, Dev& forward_que, bool router,
 
 void IPIn::drop(const std::string& msg, const std::string& buf)
 {
-    log << "IPIn::drop: " << msg << "\n\tBuffer: " << buf << "\n";
+    log << "IPIn::drop (" << ip << "): " << msg << "\n\tBuffer: " << buf
+            << "\n";
 }
 
 void IPIn::drop(const std::string& msg, const IPHeader& iph)
 {
-    log << "IPIn::drop: " << msg << "\n\tIPHeader: " << iph << "\n";
+    log << "IPIn::drop (" << ip << "): " << msg << "\n\tIPHeader: " << iph
+            << "\n";
 }
 
 /// Recibe un paquete IP
@@ -33,28 +35,39 @@ std::string IPIn::recv(uint8_t proto, IPAddr& src, IPAddr& dst) throw (std::runt
         // No es siquiera IP
         if (buf.size() < IPHeader::header_len())
         {
+            // Silencioso
             drop("Cabecera incompleta o no es IP", buf);
             continue;
         }
         IPHeader iph(buf);
 #ifdef DEBUG
-        std::cout << "IPIn::recv: IPHeader: " << iph << "\n";
+        std::cout << "IPIn::recv (" << ip << "): IPHeader: " << iph << "\n";
         std::string tmp = buf.substr(iph.header_len());
         std::cout << "\tdata (" << tmp.size() << ") = " << tmp << "\n";
 #endif
         if (iph.version != 4)
         {
+            // Silencioso
             drop("Versión IP incorrecta", iph);
             continue;
         }
         if (!iph.check_checksum())
         {
+            // Silencioso
             drop("Mal checksum", iph);
             continue;
         }
+        // Si el TTL se va a 0
+        if (!--iph.ttl)
+        {
+            // ICMP
+            drop("TTL == 0 -> ICMP", iph);
+            continue;
+        }
         // No es para nosotros y no forwardeamos
         if (iph.dst != ip && !forward)
         {
+            // Silencioso
             drop("No es para nosotros y no hacemos forward", iph);
             continue;
         }
@@ -67,6 +80,7 @@ std::string IPIn::recv(uint8_t proto, IPAddr& src, IPAddr& dst) throw (std::runt
         // Es para nosotros pero somos router
         else if (router)
         {
+            // Silencioso
             drop("Es para nosotros pero somos un router", iph);
             continue;
         }
@@ -85,7 +99,8 @@ std::string IPIn::recv(uint8_t proto, IPAddr& src, IPAddr& dst) throw (std::runt
             data += i->second;
         }
 #ifdef DEBUG
-        std::cout << "IPIn::recv: Paquete completo: data = '" << data << "'\n";
+        std::cout << "IPIn::recv (" << ip << "): Paquete completo: data = '"
+                << data << "'\n";
 #endif
         buffer.erase(iph);
         //TODO faltaría limpiar fragmentos viejos cada tanto (timer?)