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Add code to dissect MX and LOC records ("sparc.com" has both). 

svn path=/trunk/; revision=694
This commit is contained in:
Guy Harris 1999-09-21 07:15:38 +00:00
parent f37741ebde
commit 453a4e95fb
1 changed files with 107 additions and 1 deletions
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108
packet-dns.c
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@ -1,7 +1,7 @@
/* packet-dns.c
* Routines for DNS packet disassembly
*
* $Id: packet-dns.c,v 1.20 1999/07/29 05:46:53 gram Exp $
* $Id: packet-dns.c,v 1.21 1999/09/21 07:15:38 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
@ -389,6 +389,48 @@ get_dns_name_type_class (const u_char *dns_data_ptr,
return len;
}
static double
rfc1867_size(const u_char *dptr)
{
double size;
guint32 exponent;
size = (*dptr & 0xF0) >> 4;
exponent = (*dptr & 0x0F);
while (exponent != 0) {
size *= 10;
exponent--;
}
return size / 100; /* return size in meters, not cm */
}
static char *
rfc1867_angle(const u_char *dptr, const char *nsew)
{
guint32 angle;
char direction;
guint32 degrees, minutes, secs, tsecs;
static char buf[10+1+3+1 + 2+1+3+1 + 2+1+3+1+3+1 + 1 + 1];
angle = pntohl(dptr);
if (angle < 0x80000000U) {
angle = 0x80000000U - angle;
direction = nsew[1];
} else {
angle = angle - 0x80000000U;
direction = nsew[0];
}
tsecs = angle % 1000;
angle = angle / 1000;
secs = angle % 60;
angle = angle / 60;
minutes = angle % 60;
degrees = angle / 60;
sprintf(buf, "%u deg %u min %u.%03u sec %c", degrees, minutes, secs,
tsecs, direction);
return buf;
}
static int
dissect_dns_query(const u_char *dns_data_ptr, const u_char *pd, int offset,
@ -607,6 +649,70 @@ dissect_dns_answer(const u_char *dns_data_ptr, const u_char *pd, int offset,
break;
}
break;
case T_MX:
{
guint16 preference;
char mx_name[MAXDNAME];
int mx_name_len;
rrptr = dptr;
preference = pntohs(rrptr);
rrptr += 2;
mx_name_len = get_dns_name(dns_data_ptr, rrptr, mx_name, sizeof(mx_name));
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s, preference %u, mx %s",
name, type_name, class_name, preference, mx_name);
rr_tree = add_rr_to_tree(trr, ETT_DNS_RR, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
offset += (dptr - data_start);
proto_tree_add_text(rr_tree, offset, 2, "Preference: %u", preference);
offset += 2;
proto_tree_add_text(rr_tree, offset, mx_name_len, "Mail exchange: %s", mx_name);
}
break;
case T_LOC:
{
rrptr = dptr;
trr = proto_tree_add_text(dns_tree, offset, (dptr - data_start) + data_len,
"%s: type %s, class %s",
name, type_name, class_name);
rr_tree = add_rr_to_tree(trr, ETT_DNS_RR, offset, name, name_len,
long_type_name, class_name, ttl, data_len);
offset += (dptr - data_start);
proto_tree_add_text(rr_tree, offset, 1, "Version: %u", *dptr);
if (*rrptr == 0) {
/* Version 0, the only version RFC 1876 discusses. */
rrptr++;
offset++;
proto_tree_add_text(rr_tree, offset, 1, "Size: %g m",
rfc1867_size(rrptr));
rrptr++;
offset++;
proto_tree_add_text(rr_tree, offset, 1, "Horizontal precision: %g m",
rfc1867_size(rrptr));
rrptr++;
offset++;
proto_tree_add_text(rr_tree, offset, 1, "Vertical precision: %g m",
rfc1867_size(rrptr));
rrptr++;
offset++;
proto_tree_add_text(rr_tree, offset, 4, "Latitude: %s",
rfc1867_angle(rrptr, "NS"));
rrptr += 4;
offset += 4;
proto_tree_add_text(rr_tree, offset, 4, "Longitude: %s",
rfc1867_angle(rrptr, "EW"));
rrptr += 4;
offset += 4;
proto_tree_add_text(rr_tree, offset, 4, "Altitude: %g m",
(pntohl(rrptr) - 10000000)/100.0);
} else
proto_tree_add_text(rr_tree, offset, data_len, "Data");
break;
}
break;
/* TODO: parse more record types */