X-Git-Url: http://dolda2000.com/gitweb/?p=icmp-dn.git;a=blobdiff_plain;f=idnlookup.c;h=be4809bc934a443aa53a3e17c37b88dcbd6d2de6;hp=bd45b750583a7b433dba28445dd57da8759bbbfd;hb=15a913c297d12c0a4b14c01437420ac0df8b6675;hpb=3d6143ece9dc7829a59674c2d1148830a480d7ce

diff --git a/idnlookup.c b/idnlookup.c
index bd45b75..be4809b 100644
--- a/idnlookup.c
+++ b/idnlookup.c
@@ -73,11 +73,13 @@ void printdn(FILE *f, unsigned char *dnbuf, size_t size)
 		fprintf(stderr, "domain name decompression not implemented, aborting\n");
 		exit(1);
 	    }
-	    printf("%.*s.", (int)*p, p + 1);
+	    fprintf(f, "%.*s", (int)*p, p + 1);
 	    p += 1 + (int)*p;
+	    if(*p != 0)
+		fprintf(f, ".");
 	}
 	p++;
-	printf("\n");
+	fprintf(f, "\n");
     }
 }
 
@@ -86,7 +88,7 @@ void cksum(void *hdr, size_t len)
     struct icmphdr *ih;
     u_int8_t *cb;
     int i;
-    u_int8_t b1, b2;
+    int b1, b2;
     
     ih = (struct icmphdr *)hdr;
     cb = (u_int8_t *)hdr;
@@ -98,9 +100,22 @@ void cksum(void *hdr, size_t len)
     }
     if(i & 1)
 	b1 += cb[len - 1];
+    while(1) {
+	if(b1 >= 256) {
+	    b2 += b1 >> 8;
+	    b1 &= 0xff;
+	    continue;
+	}
+	if(b2 >= 256) {
+	    b1 += b2 >> 8;
+	    b2 &= 0xff;
+	    continue;
+	}
+	break;
+    }
     cb = (u_int8_t *)&ih->checksum;
-    cb[0] = ~b1;
-    cb[1] = ~b2;
+    cb[0] = ~(u_int8_t)b1;
+    cb[1] = ~(u_int8_t)b2;
 }
 
 void usage(void)
@@ -121,14 +136,19 @@ int main(int argc, char **argv)
     struct pollfd pfd;
     struct timeval tvb, tvc;
     struct sockaddr_storage name;
-    int timeout, elapsed;
+    int timeout, dispttl;
+    int elapsed;
     
     timeout = 3000;
-    while((c = getopt(argc, argv, "ht:")) != -1) {
+    dispttl = 0;
+    while((c = getopt(argc, argv, "hTt:")) != -1) {
 	switch(c) {
 	case 't':
 	    timeout = atoi(optarg);
 	    break;
+	case 'T':
+	    dispttl = 1;
+	    break;
 	case 'h':
 	case '?':
 	case ':':
@@ -221,6 +241,8 @@ int main(int argc, char **argv)
 	    }
 	}
 	
+	if(dispttl)
+	    printf("%i\n", ntohl(rep.ttl));
 	printdn(stdout, buf + sizeof(iphdr) + sizeof(rep), ret - sizeof(iphdr) - sizeof(rep));
 	
 	close(s);