0.9.4 protect crude against small packets from non-rudes

crude/main.c

@@ -1018,6 +1018,7 @@ static int rec_to_file(unsigned short port, unsigned long limit)
 	  struct pcap_pkthdr *header;
 	  const u_char *packet;
 	  int result;
+	  int nsmallpkts=0;
 
 	  while(1)
 	    {
@@ -1036,6 +1037,8 @@ static int rec_to_file(unsigned short port, unsigned long limit)
 	      if(rec_bytes <= 0)
 		{
 		  RUDEBUG1("crude: error when receiving packet: %s\n",strerror(errno));
+		} else if (rec_bytes < sizeof(struct udp_data)){ // not a rude packet
+		  nsmallpkts++;
 		}
 	      else
 		{
@@ -1247,6 +1250,7 @@ static int rec_n_print(unsigned short port, unsigned long limit)
 	int                ttl = 64;
 	int                hoplimit = 64;
 	int                received_ttl;
+	int                nsmallpkts=0;
 	struct sockaddr_storage src_addr;
 	struct msghdr msgh;
 	struct iovec iov;
@@ -1288,8 +1292,9 @@ static int rec_n_print(unsigned short port, unsigned long limit)
 		if(rec_bytes <= 0)
 		{
 			RUDEBUG1("crude: error when receiving packet: %s\n",strerror(errno));
-		}
-		else
+		} else if (rec_bytes < sizeof(struct udp_data)){ // not a rude/crude packet
+		  nsmallpkts++;
+		} else
 		{
 			struct cmsghdr *cmsg;
 			int *ttlptr;

include/rude.h

@@ -35,7 +35,7 @@
 #define PMAXSIZE 32768  /* Maximum accepted UDP-data field/packet size      */
 #define MINDURAT 0.001  /* Minimum allowed flow duration in seconds (float) */
 
-#define VERSION "0.9.3"
+#define VERSION "0.9.4"
 
 /*
  * Enumeration definition for different (known) flow types