Date: Tue, 6 Nov 2001 07:54:51 +1030 From: Ian West <ian@niw.com.au> To: freebsd-net@freebsd.org Subject: Results from RTM_GET on route socket ? Message-ID: <20011106075451.E34308@rose.niw.com.au>
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I am a bit confused about the results of RTM_GET. Below is a hexdump of
the response I am getting, The response rtm_addrs field is 0x37 which
I believe indicates I should have values for the following in top down
order.
#define RTA_DST 0x1 /* destination sockaddr present */
#define RTA_GATEWAY 0x2 /* gateway sockaddr present */
#define RTA_NETMASK 0x4 /* netmask sockaddr present */
#define RTA_IFP 0x10 /* interface name sockaddr present */
#define RTA_IFA 0x20 /* interface addr sockaddr present */
Starting at the * (Offset 5c, sizeof(struct rt_msghdr) I have 16 bytes
for RTA_DST, 16 bytes for RTA_GATEWAY, and then 4 null bytes. After this
there seems to be a valid RTA_IFP, and RTA_IFA. My understanding is that
the items should be sockaddr's, what is the correct way to interpret the
null bytes ? (I don't want to write iffy code that breaks later :-)
0x0000: c8 00 05 04 02 00 00 00 43 08 01 00 37 00 00 00 H C 7
0x0010: ef 0e 00 00 00 00 00 00 00 00 00 00 00 00 00 00 o
0x0020: 00 00 00 00 00 00 00 00 dc 05 00 00 00 00 00 00 \
0x0030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0040: 00 00 00 00 00 00 00 00 d5 17 00 00 00 00 00 00 U
0x0050: 00 00 00 00 00 00 00 00 00 00 00 00*10 02 00 00
0x0060: 00 00 00 00 00 00 00 00 00 00 00 00 10 02 00 00
0x0070: c0 a8 01 0a 00 00 00 00 00 00 00 00 00 00 00 00 @(
0x0080: 38 12 02 00 06 03 06 00 64 63 30 00 80 c8 cd 23 8 dc0 HM#
0x0090: fd 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 }
0x00a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x00b0: 00 00 00 00 00 00 00 00 10 02 00 00 c0 a8 01 09 @(
0x00c0: 00 00 00 00 00 00 00 00 -- -- -- -- -- -- -- --
Thanks for any feedback..
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