Wireshark · Ethereal-dev: [Ethereal-dev] [patch] PIM hello options decode

["Kevin Humphries" <khumphries@xxxxxxxxxxxx>]

Here is a patch to decode all know PIM hello options as of
draft-ietf-pim-sm-v2-new-05.  The only one that I could not test was
option 2 - LAN Prune Delay.

Thanks for considering this patch.

Kevin

Index: packet-pim.c
===================================================================
RCS file: /cvsroot/ethereal/packet-pim.c,v
retrieving revision 1.39
diff -u -r1.39 packet-pim.c
--- packet-pim.c        2002/02/01 07:06:32     1.39
+++ packet-pim.c        2002/04/18 03:47:24
@@ -749,17 +749,65 @@
        case 0: /*hello*/
          {
            while (tvb_reported_length_remaining(tvb, offset) >= 2) {
-               if (tvb_get_ntohs(tvb, offset) == 1 &&
-                   tvb_get_ntohs(tvb, offset + 2) == 2) {
-                   guint16 holdtime;
+               guint16 hello_opt, opt_len;
+               guint16 holdtime;
+               guint16 lan_delay;
+               guint16 override_interval;
+               guint32 priority;
+               guint32 opt_value = 0;

-                   holdtime = tvb_get_ntohs(tvb, offset + 4);
-                   proto_tree_add_text(pimopt_tree, tvb, offset, 6,
-                       "Holdtime: %u%s", holdtime,
-                       holdtime == 0xffff ? " (infty)" : "");
-                   offset += 6;
-               } else
-                   break;
+               hello_opt = tvb_get_ntohs(tvb, offset);
+               opt_len = tvb_get_ntohs(tvb, offset + 2);
+
+               if(opt_len == 2)
+                       opt_value = tvb_get_ntohs(tvb, offset + 4);
+               if(opt_len == 4)
+                       opt_value = tvb_get_ntohl(tvb, offset + 4);
+
+               switch(hello_opt) {
+               case 1: /* holdtime */
+                       holdtime = opt_value;
+                       proto_tree_add_text(pimopt_tree, tvb, offset, 4
+ opt_len,
+                                           "Holdtime: %u%s", holdtime,
+                                           holdtime == 0xffff ? "
(infty)" : "");
+                       break;
+               case 2: /* LAN prune delay */
+               {
+                       proto_tree *sub_tree = NULL;
+                       proto_item *landelay_option;
+
+                       landelay_option = proto_tree_add_text(pim_tree,
tvb, offset, -1,
+                                                       "LAN Prune Delay");
+                       sub_tree =
proto_item_add_subtree(landelay_option, ett_pim);
+
+                       lan_delay = (opt_value & 0x7f00) >> 8;
+                       override_interval = opt_value & 0xff;
+                       proto_tree_add_text(sub_tree, tvb, offset, 4 +
opt_len,
+                                           "T bit is %s",
+                                           opt_value & 0x8000 ? "set" :
"not set");
+                       proto_tree_add_text(sub_tree, tvb, offset, 4 +
opt_len,
+                                           "LAN Delay:  %u", lan_delay);
+                       proto_tree_add_text(sub_tree, tvb, offset, 4 +
opt_len,
+                                           "Override Interval:  %u",
override_interval);
+                       break;
+               }
+               case 19: /* priority */
+                       priority = opt_value;
+                       proto_tree_add_text(pimopt_tree, tvb, offset, 4
+ opt_len,
+                                       "DR Priority: %u", priority);
+                       break;
+               case 20: /* generation ID */
+                       proto_tree_add_text(pimopt_tree, tvb, offset, 4
+ opt_len,
+                                           "Generation ID: %d", opt_value);
+                       break;
+
+               default:
+                       proto_tree_add_text(pimopt_tree, tvb, offset, 4
+ opt_len,
+                                           "Unknown option: %d  len: %d
 value: 0x%x",
+                                           hello_opt, opt_len, opt_value);
+                       break;
+               }
+               offset += 4 + opt_len;
            }
            break;
          }






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