make pcap compile time activatable : #ifdef

crude/main.c

@@ -48,7 +48,9 @@
 #include <netinet/ip6.h>
 #include <netinet/udp.h>
 #include <limits.h>
+#ifdef PCAP
 #include <pcap.h>
+#endif
 #include <netpacket/packet.h>
 #include <net/ethernet.h> /* the L2 protocols */
 //#include <linux/if_packet.h>  // provided by netpacket/packet.h
@@ -110,8 +112,13 @@ char preffix[] = "::ffff:";
 short opt_af_packet=0, opt_pcap=0;
 short opt_ktime=0; // kernel packet time by ioctl
 short opt_fork=0; // fork for write in separate process with noblock for improving packet loss
+
+short pcap_enabled=0;
+#ifdef PCAP
 char pcap_dev[100]="";
 pcap_t *main_pcap;
+pcap_enabled=1;
+#endif
 
 // data structure for ouput ring buffer 
 int  osize;
@@ -266,6 +273,7 @@ int main(int argc, char **argv)
 		  break;
 
 		case 'C': // pcap capture
+		  #ifdef PCAP
 			if(optarg != NULL)
 			{
 				errno=0;
@@ -277,6 +285,10 @@ int main(int argc, char **argv)
 				RUDEBUG1("crude: invalid commandline arguments!\n");
 				retval = -2;
 			}
+		  #else
+		      printf("Recompile and enable PCAP with -DPCAP\n");
+		      retval= -2;
+		  #endif
 			break;
 
 		case 'i':
@@ -655,6 +667,7 @@ static int make_conn(unsigned short port, char *ifaddr,int use_ip6,unsigned int
 	      return -3;
 	      } 
 	} else if (opt_pcap) {
+	  #ifdef PCAP
 	  struct bpf_program fp;		/* The compiled filter */
 	  char filter[100];
 	  char errbuf[PCAP_ERRBUF_SIZE];
@@ -669,11 +682,11 @@ static int make_conn(unsigned short port, char *ifaddr,int use_ip6,unsigned int
 	    RUDEBUG1("Couldn't parse filter %s: %s\n", filter, pcap_geterr(main_pcap));
 	    return(-1);
 	  }
-	if ( pcap_setfilter(main_pcap, &fp) == -1) {
+	  if ( pcap_setfilter(main_pcap, &fp) == -1) {
 	    RUDEBUG1("Couldn't install filter %s: %s\n", filter, pcap_geterr(main_pcap));
 	    return(-1);
 	  }
-	  
+	  #endif
 	} else {
 
 	  if( (our_sock=socket(our_addr.ss_family ,SOCK_DGRAM,0) ) < 0)
@@ -1048,6 +1061,7 @@ static int rec_to_file(unsigned short port, unsigned long limit)
 	  while(1)
 	    {
 	      if ( opt_pcap){
+		#ifdef PCAP
 		if ( (  result= pcap_next_ex(main_pcap, &header, &packet)) < 1 ){
 		  if ( result == 0 ) continue;  // just timeout waiting for data
 		  fprintf( stderr, "crude: error when receiving pcap packet: result %d , error %s \n", 
@@ -1055,6 +1069,7 @@ static int rec_to_file(unsigned short port, unsigned long limit)
 		  rec_bytes=0;
 		};
 		rec_bytes = header->caplen;
+		#endif
 	      } else {
 		rec_bytes = recvfrom(main_socket, buffer, PMAXSIZE, 0,
 		                     (struct sockaddr *)&src_addr, (socklen_t *)&src_len);
@@ -1071,10 +1086,12 @@ static int rec_to_file(unsigned short port, unsigned long limit)
 		  time1=(struct timeval){0}; // new packet - blank
 
 		  if ( opt_pcap || opt_af_packet){  // raw packets unwrap
+		    #ifdef PCAP
 		    if ( opt_pcap) { // ether header
 		      rude_data= (struct udp_data*) (packet + 14) ; // compile error : sizeof(struct ether_header);
 		      memcpy(&time1, &header->ts, sizeof(struct timeval));
-		    } 
+		    }
+		    #endif
 		      
 		    unsigned short iphdrlen;
 		    unsigned char prot;