static int
dissect_msnip_gm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
{
guint8 count;
/* group count */
count = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(parent_tree, hf_count, tvb, offset, 1, count);
offset += 1;
/* checksum */
igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
offset += 2;
/* holdtime */
proto_tree_add_uint(parent_tree, hf_holdtime, tvb, offset, 4, count);
offset += 4;
while (count--) {
proto_tree *tree;
proto_item *item;
guint32 maddr;
guint8 masklen;
int old_offset = offset;
item = proto_tree_add_item(parent_tree, hf_groups,
tvb, offset, -1, ENC_NA);
tree = proto_item_add_subtree(item, ett_groups);
/* multicast group */
maddr = tvb_get_ipv4(tvb, offset);
proto_tree_add_ipv4(tree, hf_maddr, tvb, offset, 4,
maddr);
offset += 4;
/* mask length */
masklen = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_mask, tvb,
offset, 1, masklen);
offset += 1;
/* skip 3 unused bytes */
offset += 3;
if (item) {
proto_item_set_text(item,"Group: %s/%d",
ip_to_str((guint8 *)&maddr), masklen);
proto_item_set_len(item, offset-old_offset);
}
}
return offset;
}
static int
dissect_mrdisc_mrst(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
{
/* skip reserved byte */
offset += 1;
/* checksum */
igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
offset += 2;
return offset;
}
static int
dissect_msnip_rmr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
{
guint8 count;
/* group count */
count = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(parent_tree, hf_count, tvb, offset, 1, count);
offset += 1;
/* checksum */
igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
offset += 2;
while (count--) {
proto_tree *tree;
proto_item *item;
guint8 rec_type;
guint32 maddr;
int old_offset = offset;
item = proto_tree_add_item(parent_tree, hf_groups,
tvb, offset, -1, ENC_NA);
tree = proto_item_add_subtree(item, ett_groups);
/* record type */
rec_type = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_rec_type, tvb, offset, 1, rec_type);
offset += 1;
/* skip 3 unused bytes */
offset += 3;
/* multicast group */
maddr = tvb_get_ipv4(tvb, offset);
proto_tree_add_ipv4(tree, hf_maddr, tvb, offset, 4,
maddr);
offset += 4;
if (item) {
proto_item_set_text(item,"Group: %s %s",
ip_to_str((guint8 *)&maddr),
val_to_str(rec_type, msnip_rec_types,
"Unknown Type:0x%02x"));
proto_item_set_len(item, offset-old_offset);
}
}
return offset;
}
static int
dissect_msnip_is(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
{
/* skip reserved byte */
offset += 1;
/* checksum */
igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
offset += 2;
/* 16 bit holdtime */
proto_tree_add_uint(parent_tree, hf_holdtime16, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
offset += 2;
/* Generation ID */
proto_tree_add_uint(parent_tree, hf_genid, tvb, offset, 2, tvb_get_ntohs(tvb, offset));
offset += 2;
return offset;
}
/* This function is only called from the IGMP dissector */
int
dissect_rgmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
{
proto_tree *tree;
proto_item *item;
guint8 type;
if (!proto_is_protocol_enabled(find_protocol_by_id(proto_rgmp))) {
/* we are not enabled, skip entire packet to be nice
to the igmp layer. (so clicking on IGMP will display the data)
*/
return offset + tvb_length_remaining(tvb, offset);
}
item = proto_tree_add_item(parent_tree, proto_rgmp, tvb, offset, -1, ENC_NA);
tree = proto_item_add_subtree(item, ett_rgmp);
col_set_str(pinfo->cinfo, COL_PROTOCOL, "RGMP");
col_clear(pinfo->cinfo, COL_INFO);
type = tvb_get_guint8(tvb, offset);
if (check_col(pinfo->cinfo, COL_INFO)) {
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(type, rgmp_types, "Unknown Type: 0x%02x"));
}
proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
offset += 1;
/* reserved */
offset += 1;
igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
offset += 2;
proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
return offset;
}
/* This function is only called from the IGMP dissector */
int
dissect_igap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
{
proto_tree *tree;
proto_item *item;
guint8 type, tsecs, subtype, asize, msize;
guchar account[ACCOUNT_SIZE+1], message[MESSAGE_SIZE+1];
if (!proto_is_protocol_enabled(find_protocol_by_id(proto_igap))) {
/* we are not enabled, skip entire packet to be nice
to the igmp layer. (so clicking on IGMP will display the data)
*/
return offset + tvb_length_remaining(tvb, offset);
}
item = proto_tree_add_item(parent_tree, proto_igap, tvb, offset, -1, ENC_NA);
tree = proto_item_add_subtree(item, ett_igap);
col_set_str(pinfo->cinfo, COL_PROTOCOL, "IGAP");
col_clear(pinfo->cinfo, COL_INFO);
type = tvb_get_guint8(tvb, offset);
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(type, igap_types, "Unknown Type: 0x%02x"));
proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
offset += 1;
tsecs = tvb_get_guint8(tvb, offset);
proto_tree_add_uint_format_value(tree, hf_max_resp, tvb, offset, 1, tsecs,
"%.1f sec (0x%02x)", tsecs * 0.1, tsecs);
offset += 1;
igmp_checksum(tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
offset += 2;
proto_tree_add_item(tree, hf_maddr, tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_uint(tree, hf_version, tvb, offset, 1,
tvb_get_guint8(tvb, offset));
offset += 1;
subtype = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_subtype, tvb, offset, 1, subtype);
offset += 2;
proto_tree_add_uint(tree, hf_challengeid, tvb, offset, 1,
tvb_get_guint8(tvb, offset));
offset += 1;
asize = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_asize, tvb, offset, 1, asize);
offset += 1;
msize = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_msize, tvb, offset, 1, msize);
offset += 3;
if (asize > 0) {
if (asize > ACCOUNT_SIZE) {
/* Bogus account size.
XXX - flag this? */
asize = ACCOUNT_SIZE;
}
tvb_memcpy(tvb, account, offset, asize);
account[asize] = '\0';
proto_tree_add_string(tree, hf_account, tvb, offset, asize, account);
}
offset += ACCOUNT_SIZE;
if (msize > 0) {
if (msize > MESSAGE_SIZE) {
/* Bogus message size.
XXX - flag this? */
msize = MESSAGE_SIZE;
}
tvb_memcpy(tvb, message, offset, msize);
switch (subtype) {
case IGAP_SUBTYPE_PASSWORD_JOIN:
case IGAP_SUBTYPE_PASSWORD_LEAVE:
/* Challenge field is user's password */
message[msize] = '\0';
proto_tree_add_string(tree, hf_igap_user_password, tvb, offset, msize, message);
break;
case IGAP_SUBTYPE_CHALLENGE_RESPONSE_JOIN:
case IGAP_SUBTYPE_CHALLENGE_RESPONSE_LEAVE:
/* Challenge field is the results of MD5 calculation */
proto_tree_add_item(tree, hf_igap_result_of_md5_calculation, tvb, offset, msize, ENC_NA);
break;
case IGAP_SUBTYPE_CHALLENGE:
/* Challenge field is the challenge value */
proto_tree_add_item(tree, hf_igap_challenge, tvb, offset, msize, ENC_NA);
break;
case IGAP_SUBTYPE_AUTH_MESSAGE:
/* Challenge field indicates the result of the authenticaion */
proto_tree_add_uint(tree, hf_igap_authentication_result, tvb, offset, msize, message[0]);
break;
case IGAP_SUBTYPE_ACCOUNTING_MESSAGE:
/* Challenge field indicates the accounting status */
proto_tree_add_uint(tree, hf_igap_accounting_status, tvb, offset, msize, message[0]);
break;
default:
proto_tree_add_item(tree, hf_igap_unknown_message, tvb, offset, msize, ENC_NA);
}
}
offset += MESSAGE_SIZE;
if (item) proto_item_set_len(item, offset);
return offset;
}
static int
dissect_dvmrp_v1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
{
guint8 code;
guint8 af=2; /* default */
/* version */
proto_tree_add_uint(parent_tree, hf_version, tvb, 0, 0, 1);
/* type of command */
proto_tree_add_uint(parent_tree, hf_type, tvb, offset, 1, 0x13);
offset += 1;
/* code */
code = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(parent_tree, hf_code_v1, tvb, offset, 1, code);
offset += 1;
col_add_fstr(pinfo->cinfo, COL_INFO,
"V%d %s",1 ,val_to_str(code, code_v1,
"Unknown Type:0x%02x"));
/* checksum */
igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
offset += 2;
/* decode all the v1 commands */
while (tvb_reported_length_remaining(tvb, offset) > 0) {
proto_tree *tree;
proto_item *item;
guint8 cmd,count;
int old_offset = offset;
item = proto_tree_add_item(parent_tree, hf_commands,
tvb, offset, -1, ENC_NA);
tree = proto_item_add_subtree(item, ett_commands);
cmd = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_command, tvb,
offset, 1, cmd);
offset += 1;
switch (cmd){
case V1_COMMAND_NULL:
offset += 1; /* skip ignored/pad byte*/
if (item) {
proto_item_set_text(item, "Command: NULL");
}
break;
case V1_COMMAND_AFI:
af = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_afi, tvb,
offset, 1, af);
offset += 1;
if (item) {
proto_item_set_text(item, "%s: %s",
val_to_str(cmd, command, "Unknown Command:0x%02x"),
val_to_str(af, afi, "Unknown Family:0x%02x")
);
}
break;
case V1_COMMAND_SUBNETMASK:
count = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_count, tvb,
offset, 1, count);
offset += 1;
if (count) { /* must be 0 or 1 */
proto_tree_add_item(tree, hf_netmask,
tvb, offset, 4, ENC_BIG_ENDIAN);
if (item) {
proto_item_set_text(item, "%s: %d.%d.%d.%d",
val_to_str(cmd, command, "Unknown Command:0x%02x"),
tvb_get_guint8(tvb, offset),
tvb_get_guint8(tvb, offset+1),
tvb_get_guint8(tvb, offset+2),
tvb_get_guint8(tvb, offset+3));
}
offset += 4;
} else {
if (item) {
proto_item_set_text(item, "%s: <no mask supplied>",
val_to_str(cmd, command, "Unknown Command:0x%02x"));
}
}
break;
case V1_COMMAND_METRIC:
proto_tree_add_item(tree, hf_metric, tvb,
offset, 1, ENC_BIG_ENDIAN);
if (item) {
proto_item_set_text(item, "%s: %d",
val_to_str(cmd, command, "Unknown Command:0x%02x"),
tvb_get_guint8(tvb, offset));
}
offset += 1;
break;
case V1_COMMAND_FLAGS0:
count = tvb_get_guint8(tvb, offset);
proto_tree_add_boolean(tree, hf_dest_unr, tvb, offset, 1, count);
proto_tree_add_boolean(tree, hf_split_horiz, tvb, offset, 1, count);
if (item) {
proto_item_set_text(item, "%s: 0x%02x",
val_to_str(cmd, command, "Unknown Command:0x%02x"), count);
}
offset += 1;
break;
case V1_COMMAND_INFINITY:
proto_tree_add_item(tree, hf_infinity, tvb,
offset, 1, ENC_BIG_ENDIAN);
if (item) {
proto_item_set_text(item, "%s: %d",
val_to_str(cmd, command, "Unknown Command:0x%02x"), tvb_get_guint8(tvb, offset));
}
offset += 1;
break;
case V1_COMMAND_DA:
case V1_COMMAND_RDA: /* same as DA */
count = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_count, tvb,
offset, 1, count);
offset += 1;
while (count--) {
proto_tree_add_item(tree, hf_daddr,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
}
if (item) {
proto_item_set_text(item, "%s",
val_to_str(cmd, command, "Unknown Command:0x%02x"));
}
break;
case V1_COMMAND_NMR:
count = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_count, tvb,
offset, 1, count);
offset += 1;
while (count--) {
proto_tree_add_item(tree, hf_maddr,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
proto_tree_add_item(tree, hf_hold, tvb,
offset, 4, ENC_BIG_ENDIAN);
offset += 4;
}
if (item) {
proto_item_set_text(item, "%s",
val_to_str(cmd, command, "Unknown Command:0x%02x"));
}
break;
case V1_COMMAND_NMR_CANCEL:
count = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_count, tvb,
offset, 1, count);
offset += 1;
while (count--) {
proto_tree_add_item(tree, hf_maddr,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
}
if (item) {
proto_item_set_text(item, "%s",
val_to_str(cmd, command, "Unknown Command:0x%02x"));
}
break;
}
proto_item_set_len(item, offset-old_offset);
}
return offset;
}
static int
dissect_dvmrp_v3(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
{
guint8 code;
/* version */
proto_tree_add_uint(parent_tree, hf_version, tvb, 0, 0, 3);
/* type of command */
proto_tree_add_uint(parent_tree, hf_type, tvb, offset, 1, 0x13);
offset += 1;
/* code */
code = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(parent_tree, hf_code_v3, tvb, offset, 1, code);
offset += 1;
col_add_fstr(pinfo->cinfo, COL_INFO,
"V%d %s",3 ,val_to_str(code, code_v3,
"Unknown Type:0x%02x"));
/* checksum */
igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
offset += 2;
/* skip unused byte */
offset += 1;
/* PROBE and NEIGHBORS 2 packets have capabilities flags, unused
for other packets */
if (code==DVMRP_V3_PROBE || code==DVMRP_V3_NEIGHBORS_2) {
static const int * capabilities[] = {
&hf_cap_netmask,
&hf_cap_snmp,
&hf_cap_mtrace,
&hf_cap_genid,
&hf_cap_prune,
&hf_cap_leaf,
NULL
};
proto_tree_add_bitmask(parent_tree, tvb, offset, hf_capabilities,
ett_capabilities, capabilities, ENC_NA);
}
offset += 1;
/* minor version */
proto_tree_add_item(parent_tree, hf_min_ver, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* major version */
proto_tree_add_item(parent_tree, hf_maj_ver, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
switch (code) {
case DVMRP_V3_PROBE:
/* generation id */
proto_tree_add_item(parent_tree, hf_genid, tvb,
offset, 4, ENC_BIG_ENDIAN);
offset += 4;
while (tvb_reported_length_remaining(tvb, offset)>=4) {
proto_tree_add_item(parent_tree, hf_neighbor,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
}
break;
case DVMRP_V3_REPORT:
offset = dissect_v3_report(tvb, parent_tree, offset);
break;
case DVMRP_V3_PRUNE:
/* source address */
proto_tree_add_item(parent_tree, hf_saddr,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
/* group address */
proto_tree_add_item(parent_tree, hf_maddr,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
/* prune lifetime */
proto_tree_add_item(parent_tree, hf_life,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
/* source netmask */
if (tvb_reported_length_remaining(tvb, offset)>=4) {
proto_tree_add_item(parent_tree, hf_netmask,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
}
break;
case DVMRP_V3_GRAFT:
/* source address */
proto_tree_add_item(parent_tree, hf_saddr,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
/* group address */
proto_tree_add_item(parent_tree, hf_maddr,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
/* source netmask */
if (tvb_reported_length_remaining(tvb, offset)>=4) {
proto_tree_add_item(parent_tree, hf_netmask,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
}
break;
case DVMRP_V3_GRAFT_ACK:
/* source address */
proto_tree_add_item(parent_tree, hf_saddr,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
/* group address */
proto_tree_add_item(parent_tree, hf_maddr,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
/* source netmask */
if (tvb_reported_length_remaining(tvb, offset)>=4) {
proto_tree_add_item(parent_tree, hf_netmask,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
}
break;
case DVMRP_V3_ASK_NEIGHBORS:
case DVMRP_V3_NEIGHBORS:
/* XXX - obsolete, and the draft doesn't describe them */
break;
case DVMRP_V3_ASK_NEIGHBORS_2:
/* No data */
break;
case DVMRP_V3_NEIGHBORS_2:
while (tvb_reported_length_remaining(tvb, offset)>=12) {
guint8 neighbor_count;
/* local address */
proto_tree_add_item(parent_tree, hf_local,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
/* Metric */
proto_tree_add_item(parent_tree, hf_metric,
tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* Threshold */
proto_tree_add_item(parent_tree, hf_threshold,
tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* Flags */
{
proto_tree *tree;
proto_item *item;
item = proto_tree_add_item(parent_tree, hf_flags,
tvb, offset, 1, ENC_NA);
tree = proto_item_add_subtree(item, ett_flags);
proto_tree_add_item(tree, hf_flag_tunnel, tvb,
offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(tree, hf_flag_srcroute, tvb,
offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(tree, hf_flag_down, tvb,
offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(tree, hf_flag_disabled, tvb,
offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(tree, hf_flag_querier, tvb,
offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(tree, hf_flag_leaf, tvb,
offset, 1, ENC_BIG_ENDIAN);
}
offset += 1;
/* Neighbor count */
neighbor_count = tvb_get_guint8(tvb, offset);
proto_tree_add_item(parent_tree, hf_ncount,
tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
while ((tvb_reported_length_remaining(tvb, offset)>=4)
&& (neighbor_count>0)) {
proto_tree_add_item(parent_tree, hf_neighbor,
tvb, offset, 4, ENC_BIG_ENDIAN);
offset += 4;
neighbor_count--;
}
}
break;
}
return offset;
}
static int
dissect_mrdisc_mra(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
{
guint16 num;
/* Advertising Interval */
proto_tree_add_item(parent_tree, hf_advint, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* checksum */
igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
offset += 2;
/* skip unused bytes */
offset += 2;
/* number of options */
num = tvb_get_ntohs(tvb, offset);
proto_tree_add_uint(parent_tree, hf_numopts, tvb,
offset, 2, num);
offset += 2;
/* process any options */
while (num--) {
proto_tree *tree;
proto_item *item;
guint8 type,len;
int old_offset = offset;
item = proto_tree_add_item(parent_tree, hf_options,
tvb, offset, -1, ENC_NA);
tree = proto_item_add_subtree(item, ett_options);
type = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_option, tvb, offset, 1, type);
offset += 1;
len = tvb_get_guint8(tvb, offset);
proto_tree_add_uint(tree, hf_option_len, tvb, offset, 1, len);
offset += 1;
switch (type) {
case MRDISC_QI:
if (item) {
proto_item_set_text(item,"Option: %s == %d",
val_to_str(type, mrdisc_options, "unknown %x"),
tvb_get_ntohs(tvb, offset));
}
if (len != 2)
THROW(ReportedBoundsError);
proto_tree_add_item(tree, hf_qi, tvb, offset, len,
ENC_BIG_ENDIAN);
offset += len;
break;
case MRDISC_RV:
if (item) {
proto_item_set_text(item,"Option: %s == %d",
val_to_str(type, mrdisc_options, "unknown %x"),
tvb_get_ntohs(tvb, offset));
}
if (len != 2)
THROW(ReportedBoundsError);
proto_tree_add_item(tree, hf_rv, tvb, offset, len,
ENC_BIG_ENDIAN);
offset += len;
break;
default:
if (item) {
proto_item_set_text(item,"Option: unknown");
}
proto_tree_add_item(tree, hf_option_bytes,
tvb, offset, len, ENC_NA);
offset += len;
}
if (item) {
proto_item_set_len(item, offset-old_offset);
}
}
return offset;
}