new software on the server, ..., almost done
Michael Hornung
hornung at cac.washington.edu
Mon Sep 10 14:00:45 EDT 2007
(gdb) print model->ArgusThisNetworkFlowType
$9 = 2054
(gdb) print model->ArgusThisLength
$10 = 90
(gdb) print model->ArgusSnapLength
$11 = 52
(gdb) print (struct ether_header *)model->ArgusThisEpHdr
$12 = (struct ether_header *) 0x859fffa
(gdb) up
#2 0x0804f531 in ArgusProcessPacket (model=0x859f008, p=0x859fffa "",
length=90, tvp=0xbfe06d10, type=0) at ArgusModeler.c:1072
1072 if ((nflow = ArgusNewFlow(model, model->ArgusThisFlow,
model->hstruct, model->ArgusStatusQueue)) != NULL)
(gdb) x/32x p
0x859fffa: 0xb3f21400 0x18004cb1 0xccc31574 0x00450800
0x85a000a: 0x17584c00 0x2ffdb900 0x5b4550c0 0x1cacfe87
0x85a001a: 0x0c06ec2a 0x0c080608 0x0608060c 0x0d070c09
0x85a002a: 0x090d0709 0x06090f06 0x0f06070f 0x080f0607
0x85a003a: 0x07081007 0x10070810 0x08100708 0x07081007
0x85a004a: 0x0e040510 0x050d0304 0x87af1006 0x8a0a5827
0x85a005a: 0x00890000 0x10800000 0x00002000 0x71e50000
0x85a006a: 0x0000cb2d 0x00000000 0x00000000 0xe1460000
-Mike
On Mon, 10 Sep 2007 at 13:57, Carter Bullard wrote:
|Great, unfortunately there is more information that is needed:
| (gdb) print model->ArgusThisNetworkFlowType
| (gdb) print model->ArgusThisLength
| (gdb) print model->ArgusSnapLength
| (gdb) print (struct ether_header *)model->ArgusThisEpHdr
|
|And then assuming your context is in ArgusNewFlow
| (gdb) up
|
|That should put you in ArgusProcessPacket
| (gdb) x/32x p
|
|Thanks for all the help!!!!!
|
|Carter
|
|
|On Sep 10, 2007, at 1:19 PM, Michael Hornung wrote:
|
|> (gdb) print model->ArgusThisSnapLen
|> There is no member named ArgusThisSnapLen.
|>
|> (gdb) print model->ArgusThisSnapEnd
|> $4 = (unsigned char *) 0x85a0054 "�\207'X\n\212"
|>
|> (gdb) print model->ArgusThisEpHdr
|> $5 = (struct ether_header *) 0x859fffa
|>
|> (gdb) print model->ArgusThisNetworkHdr
|> $6 = (void *) 0x0
|>
|> (gdb) print *((struct arphdr *)model->ArgusThisUpHdr)
|> $7 = {ar_hrd = 3080, ar_pro = 1548, ar_hln = 8 '\b', ar_pln = 6 '\006',
|> ar_op = 3081}
|>
|> (gdb) x/32x model->ArgusThisUpHdr
|> 0x85a0020: 0x060c0c08 0x0c090608 0x07090d07 0x0f06090d
|> 0x85a0030: 0x070f0609 0x06070f06 0x1007080f 0x08100708
|> 0x85a0040: 0x07081007 0x10070810 0x05100708 0x03040e04
|> 0x85a0050: 0x1006050d 0x582787af 0x00008a0a 0x00000089
|> 0x85a0060: 0x20001080 0x00000000 0xcb2d71e5 0x00000000
|> 0x85a0070: 0x00000000 0x00000000 0x60d2e146 0x24210c00
|> 0x85a0080: 0x61d246e1 0xb60d0800 0x00000003 0x3c000500
|> 0x85a0090: 0x00000000 0x00000000 0x00000000 0x00000000
|>
|> -Mike
|>
|> On Mon, 10 Sep 2007 at 13:08, Carter Bullard wrote:
|>
|> |So it looks quickly like your trying to build an Arp flow key, for either
|> an
|> |illegal op code, or you didn't get enough data in the snaplen to get
|> |all the arp information. So, if you still have the info, lets dump the
|> packet
|> |contents, and I'll try to figure it out:
|> |
|> | (gdb) print model->ArgusThisSnapLen
|> | (gdb) print model->ArgusThisSnapEnd
|> | (gdb) print model->ArgusThisEpHdr
|> | (gdb) print model->ArgusThisNetworkHdr
|> |
|> | (gdb) print *((struct arphdr *)model->ArgusThisUpHdr)
|> | (gdb) x/32x model->ArgusThisUpHdr
|> |
|> |Carter
|> |
|> |On Sep 10, 2007, at 11:45 AM, Michael Hornung wrote:
|> |
|> |> (gdb) print *flow
|> |> $1 = {hdr = {type = 2 '\002', subtype = 6 '\006', dsr_un = {fl = {data =
|> |> 0},
|> |> vl8 = {qual = 0 '\0', len = 0 '\0'}, vl16 = {len = 0}}}, flow_un = {
|> |> ipv6 = {ip_src = {0, 0, 0, 0}, ip_dst = {0, 0, 0, 0}, flow = 0, resv =
|> |> 0,
|> |> ip_p = 0, sport = 0, dport = 0}, ip = {ip_src = 0, ip_dst = 0,
|> |> ip_p = 0 '\0', tp_p = 0 '\0', sport = 0, dport = 0, pad = 0}, mac =
|> |> {
|> |> ehdr = {ether_dhost = "\000\000\000\000\000",
|> |> ether_shost = "\000\000\000\000\000", ether_type = 0}, dsap = 0
|> |> '\0',
|> |> ssap = 0 '\0'}, icmpv6 = {ip_src = {0, 0, 0, 0}, ip_dst = {0, 0, 0,
|> |> 0},
|> |> flow = 0, resv = 0, ip_p = 0, type = 0 '\0', code = 0 '\0', id = 0},
|> |> icmp = {ip_src = 0, ip_dst = 0, ip_p = 0 '\0', tp_p = 0 '\0',
|> |> type = 0 '\0', code = 0 '\0', id = 0, ip_id = 0}, igmpv6 = {ip_src =
|> |> {0,
|> |> 0, 0, 0}, ip_dst = {0, 0, 0, 0}, flow = 0, resv = 0, ip_p = 0,
|> |> type = 0 '\0', code = 0 '\0', pad = 0}, igmp = {ip_src = 0, ip_dst =
|> |> 0,
|> |> ip_p = 0 '\0', tp_p = 0 '\0', type = 0 '\0', code = 0 '\0', pad = 0,
|> |> ip_id = 0}, espv6 = {ip_src = {0, 0, 0, 0}, ip_dst = {0, 0, 0, 0},
|> |> flow = 0, resv = 0, ip_p = 0, spi = 0}, esp = {ip_src = 0, ip_dst =
|> |> 0,
|> |> ip_p = 0 '\0', tp_p = 0 '\0', pad = 0, spi = 0}, arp = {hrd = 0,
|> |> pro = 0, hln = 0 '\0', pln = 0 '\0', op = 0, arp_spa = 0, arp_tpa =
|> |> 0,
|> |> haddr = {{ethernet = "\000\000\000\000\000",
|> |> ib = '\0' <repeats 31 times>, ieee1394 = '\0' <repeats 15
|> |> times>,
|> |> framerelay = "\000\000\000", tokenring = "\000\000\000\000\000",
|> |> arcnet = "", fiberchannel = '\0' <repeats 11 times>,
|> |> atm = '\0' <repeats 19 times>}}}, rarp = {hrd = 0, pro = 0,
|> |> hln = 0 '\0', pln = 0 '\0', op = 0, arp_tpa = 0, shaddr = {{
|> |> ethernet = "\000\000\000\000\000", ib = '\0' <repeats 31 times>,
|> |> ieee1394 = '\0' <repeats 15 times>, framerelay = "\000\000\000",
|> |> tokenring = "\000\000\000\000\000", arcnet = "",
|> |> fiberchannel = '\0' <repeats 11 times>,
|> |> atm = '\0' <repeats 19 times>}}, dhaddr = {{
|> |> ethernet = "\000\000\000\000\000", ib = '\0' <repeats 31 times>,
|> |> ieee1394 = '\0' <repeats 15 times>, framerelay = "\000\000\000",
|> |> tokenring = "\000\000\000\000\000", arcnet = "",
|> |> fiberchannel = '\0' <repeats 11 times>,
|> |> atm = '\0' <repeats 19 times>}}}, fragv6 = {ip_src = {0, 0, 0,
|> |> 0},
|> |> ip_dst = {0, 0, 0, 0}, flow = 0, resv = 0, ip_p = 0, ip_id = 0},
|> |> frag = {
|> |> ip_src = 0, ip_dst = 0, ip_p = 0 '\0', tp_p = 0 '\0', pad = {0, 0},
|> |> ip_id = 0}}}
|> |>
|> |>
|> |> (gdb) print *hstruct
|> |> $3 = {len = 0, hash = 0, key = {0 <repeats 24 times>}}
|> |>
|> |>
|> |> -Mike
|> |>
|> |> On Sun, 9 Sep 2007 at 16:52, Carter Bullard wrote:
|> |>
|> |> |OK, well like I said earlier, we need to know what kind of packet this
|> is,
|> |> |and the flow struct that we created as the key to the flow should tell
|> us.
|> |> |
|> |> |So, in gdb:
|> |> |
|> |> |(gdb) print *flow
|> |> |
|> |> |in ArgusNewFlow() will give us most of the info we need.
|> |> |But in addition, we should also get the contents of the hstruct:
|> |> |
|> |> |(gdb) print *hstruct
|> |> |
|> |> |that should tell us enough in this situation.
|> |> |
|> |> |Carter
|> |> |
|> |> |On Sep 7, 2007, at 6:27 PM, Michael Hornung wrote:
|> |> |
|> |> |> Here's where it gets me:
|> |> |>
|> |> |> (gdb) run
|> |> |> Starting program: /usr/local/sbin/argus
|> |> |> ArgusWarning: argus[29876]: 07 Sep 07 15:19:15.920346 started
|> |> |> ArgusWarning: argus[29876]: 07 Sep 07 15:19:15.920527
|> |> |> ArgusGetInterfaceStatus: interface eth2 is up
|> |> |> ArgusInfo: argus[29876]: 07 Sep 07 15:19:18.541138 connect from
|> |> |> marathon.cac.washington.edu
|> |> |>
|> |> |> Program received signal SIGSEGV, Segmentation fault.
|> |> |> 0x4c13e663 in bcopy () from /lib/libc.so.6
|> |> |>
|> |> |> (gdb) bt full
|> |> |> #0 0x4c13e663 in bcopy () from /lib/libc.so.6
|> |> |> No symbol table info available.
|> |> |> #1 0x0804ff55 in ArgusNewFlow (model=0x8fab008, flow=0x8fab3a8,
|> |> |> hstruct=0x8fab310, queue=0x8fab380) at ArgusModeler.c:1469
|> |> |> retn = (struct ArgusFlowStruct *) 0x9281420
|> |> |> timeout = 5
|> |> |> userlen = 0
|> |> |> #2 0x0804ef30 in ArgusProcessPacket (model=0x8fab008, p=0x8fac1ea "",
|> |> |> length=90, tvp=0xbfd68c70, type=0) at ArgusModeler.c:1072
|> |> |> retn = 0
|> |> |> tflow = (struct ArgusSystemFlow *) 0x8fab3a8
|> |> |> flow = (struct ArgusFlowStruct *) 0x0
|> |> |> nflow = (struct ArgusFlowStruct *) 0x9eb7b80
|> |> |> ptr = 0x8fac1ea ""
|> |> |> value = 0
|> |> |> #3 0x0805655b in ArgusEtherPacket (user=0xb7ed9008 "", h=0xbfd68c70,
|> |> |> p=0x8fac1ea "") at ArgusSource.c:683
|> |> |> ep = (struct ether_header *) 0x8fac1ea
|> |> |> ind = 0
|> |> |> src = (struct ArgusSourceStruct *) 0xb7ed9008
|> |> |> tvp = (struct timeval *) 0xbfd68c70
|> |> |> caplen = 90
|> |> |> length = 90
|> |> |> statbuf = {st_dev = 578110229122026696, __pad1 = 45768,
|> |> |> __st_ino = 3218508768, st_mode = 3218508904, st_nlink = 1275960740,
|> |> |> st_uid = 3086401536, st_gid = 1935745139, st_rdev =
|> 5480000866624733183,
|> |> |> __pad2 = 41952, st_size = -4623353967097284856, st_blksize =
|> 1275861536,
|> |> |> st_blocks = -5190746013132413544, st_atim = {tv_sec = 1, tv_nsec = 1},
|> |> |> st_mtim = {tv_sec = 0, tv_nsec = 4589194}, st_ctim = {tv_sec =
|> 4583424,
|> |> |> tv_nsec = 164972}, st_ino = 20393674228473252}
|> |> |> #4 0x00464517 in pcap_open_live () from /usr/lib/libpcap.so.0.9.4
|> |> |> No symbol table info available.
|> |> |> #5 0x00464987 in pcap_dispatch () from /usr/lib/libpcap.so.0.9.4
|> |> |> No symbol table info available.
|> |> |> #6 0x080585c1 in ArgusGetPackets (src=0xb7ed9008) at
|> ArgusSource.c:1730
|> |> |> ArgusReadMask = {__fds_bits = {128, 0 <repeats 31 times>}}
|> |> |> ArgusWriteMask = {__fds_bits = {0 <repeats 32 times>}}
|> |> |> ArgusExceptMask = {__fds_bits = {0 <repeats 32 times>}}
|> |> |> tmp = 1
|> |> |> i = 0
|> |> |> width = 7
|> |> |> noerror = 1
|> |> |> fd = 7
|> |> |> found = 1
|> |> |> up = 1
|> |> |> wait = {tv_sec = 0, tv_usec = 20000}
|> |> |> #7 0x0804b687 in main (argc=1, argv=0xbfd69084) at argus.c:567
|> |> |> commandlinew = 0
|> |> |> doconf = 0
|> |> |> dodebug = 0
|> |> |> i = 1
|> |> |> pid = 0
|> |> |> tmparg = 0x0
|> |> |> filter = 0x0
|> |> |> statbuf = {st_dev = 64768, __pad1 = 0, __st_ino = 36308349,
|> |> |> st_mode = 33188, st_nlink = 1, st_uid = 0, st_gid = 0, st_rdev = 0,
|> |> |> __pad2 = 0, st_size = 11781, st_blksize = 4096, st_blocks = 32,
|> st_atim
|> |> |> = {
|> |> |> tv_sec = 1189199340, tv_nsec = 0}, st_mtim = {tv_sec = 1189199328,
|> |> |> tv_nsec = 0}, st_ctim = {tv_sec = 1189199328, tv_nsec = 0},
|> |> |> st_ino = 36308349}
|> |> |> op = -1
|> |> |> commandlinei = 0
|> |> |> path = "/etc/argus.conf\000argus", '\0' <repeats 8170 times>
|> |> |>
|> |> |> (gdb) up
|> |> |> #1 0x0804ff55 in ArgusNewFlow (model=0x8fab008, flow=0x8fab3a8,
|> |> |> hstruct=0x8fab310, queue=0x8fab380) at ArgusModeler.c:1469
|> |> |> 1469 bcopy ((char *)&flow->flow_un, (char
|> |> |> *)&retn->canon.flow.flow_un, (flow->hdr.argus_dsrvl8.len - 1) * 4);
|> |> |>
|> |> |> (gdb) print (char *)&flow->flow_un
|> |> |> $1 = 0x8fab3ac ""
|> |> |>
|> |> |> (gdb) print (char *)&retn->canon.flow.flow_un
|> |> |> $3 = 0x92815b4 ""
|> |> |>
|> |> |> (gdb) print flow->hdr.argus_dsrvl8.len
|> |> |> There is no member named argus_dsrvl8.
|> |> |>
|> |> |> Hrmm.
|> |> |>
|> |> |> -Mike
|> |> |>
|> |> |> On Fri, 7 Sep 2007 at 17:04, Carter Bullard wrote:
|> |> |>
|> |> |> |I think I found something that could be the cause of your problem,
|> |> |> |although its a medium shot (as opposed to a long shot ;o)
|> |> |> |
|> |> |> |I'll have a new argus and clients up on the server, and it could fix
|> |> |> |Michael's problem as well, only because there are multiple changes
|> |> |> |in this update.
|> |> |> |
|> |> |> |So for Peter, I have a few more checks, and we shouldn't die if we
|> |> |> |have your problem, now (should not die). For Michael, I put in some
|> |> |> |checks for zero length hash structs, and we should survive them
|> |> |> |much better.
|> |> |> |
|> |> |> |Carter
|> |> |> |
|> |> |> |On Sep 7, 2007, at 2:20 PM, Peter Van Epp wrote:
|> |> |> |
|> |> |> |> On Fri, Sep 07, 2007 at 12:36:38PM -0400, Carter Bullard wrote:
|> |> |> |> > Hey Peter,
|> |> |> |> > Well that is good news!!!
|> |> |> |> >
|> |> |> |> > So there is another update, to support ARP functions for IP over
|> |> |> |> > Inifiniband and
|> |> |> |> > ATM, which is a pretty big change, as the physical addresses (mac
|> |> |> |> > addresses)
|> |> |> |> > can be rather large (physical address for infiniband is what 32
|> bytes
|> |> |> |> > long.
|> |> |> |> > So the flow model for ARP had to change to accommodate that.
|> |> |> |> >
|> |> |> |> > I'll put it and new matching clients up later today, or on Sunday,
|> |> |> |> > depending on
|> |> |> |> > how far I get on documentation, etc...., If someone is
|> interested
|> |> |> |> > in monitoring
|> |> |> |> > IP over infinifband on there OpenIB adapter this weekend, yell and
|> |> |> |> > I'll put it up
|> |> |> |> > sooner.
|> |> |> |> >
|> |> |> |> > Carter
|> |> |> |>
|> |> |> |> Unfortunatly it didn't hold (must be traffic of some kind). It
|> |> looks
|> |> |> |> like the problem is that retn->dsrs[i] is NULL which makes copying
|> in
|> |> to
|> |> |> |> it difficult :-).
|> |> |> |>
|> |> |> |> test4:/var/log/argus vanepp$ ra3 -r
|> |> |> |>
|> |> |>
|> |>
|> /archive/argus3/com_argus.archive/2007/09/07/com_argus.2007.09.07.09.00.00.0.gz
|> |> |> |> -n >t
|> |> |> |> ra3(10073,0xa000ed88) malloc: *** vm_allocate(size=8421376) failed
|> |> (error
|> |> |> |> code=3)
|> |> |> |> ra3(10073,0xa000ed88) malloc: *** error: can't allocate region
|> |> |> |> ra3(10073,0xa000ed88) malloc: *** set a breakpoint in szone_error to
|> |> debug
|> |> |> |> Bus error (core dumped)
|> |> |> |> test4:/var/log/argus vanepp$ ls /cores
|> |> |> |> core.10073 core.5848
|> |> |> |> test4:/var/log/argus vanepp$ ls -l /cores
|> |> |> |> total 8574696
|> |> |> |> -r-------- 1 vanepp admin 2191327232 Sep 7 11:15 core.10073
|> |> |> |> -r-------- 1 vanepp admin 2198917120 Sep 6 19:03 core.5848
|> |> |> |> test4:/var/log/argus vanepp$ gdb ra3 /cores/core.10073
|> |> |> |> GNU gdb 6.3.50-20050815 (Apple version gdb-563) (Wed Jul 19 05:17:43
|> |> GMT
|> |> |> |> 2006)
|> |> |> |> Copyright 2004 Free Software Foundation, Inc.
|> |> |> |> GDB is free software, covered by the GNU General Public License, and
|> |> you
|> |> |> are
|> |> |> |> welcome to change it and/or distribute copies of it under certain
|> |> |> conditions.
|> |> |> |> Type "show copying" to see the conditions.
|> |> |> |> There is absolutely no warranty for GDB. Type "show warranty" for
|> |> |> details.
|> |> |> |> This GDB was configured as "powerpc-apple-darwin"...Reading symbols
|> for
|> |> |> |> shared libraries .. done
|> |> |> |>
|> |> |> |> Core was generated by `/usr/local/bin/ra3'.
|> |> |> |> #0 0xffff8a74 in ___memcpy () at
|> |> |> |>
|> |> |>
|> |>
|> /System/Library/Frameworks/System.framework/PrivateHeaders/ppc/cpu_capabilities.h:189
|> |> |> |> 189
|> |> |> |>
|> |> |>
|> |>
|> /System/Library/Frameworks/System.framework/PrivateHeaders/ppc/cpu_capabilities.h:
|> |> |> |> No such file or directory.
|> |> |> |> in
|> |> |> |>
|> |> |>
|> |>
|> /System/Library/Frameworks/System.framework/PrivateHeaders/ppc/cpu_capabilities.h
|> |> |> |> (gdb) where
|> |> |> |> #0 0xffff8a74 in ___memcpy () at
|> |> |> |>
|> |> |>
|> |>
|> /System/Library/Frameworks/System.framework/PrivateHeaders/ppc/cpu_capabilities.h:189
|> |> |> |> #1 0x0005c804 in ArgusCopyRecordStruct (rec=0x405234) at
|> |> |> |> ./argus_client.c:3359
|> |> |> |> #2 0x0000979c in RaScheduleRecord (parser=0x288000, argus=0x405234)
|> at
|> |> |> |> ./argus_util.c:840
|> |> |> |> #3 0x00009c2c in ArgusHandleDatum (parser=0x288000, input=0x405000,
|> |> |> |> ptr=0x632bc4, filter=0x299f40) at ./argus_util.c:919
|> |> |> |> #4 0x00056e34 in ArgusReadStreamSocket (parser=0x288000,
|> |> input=0x405000)
|> |> |> at
|> |> |> |> ./argus_client.c:1638
|> |> |> |> #5 0x0005713c in ArgusReadFileStream (parser=0x288000,
|> input=0x405000)
|> |> at
|> |> |> |> ./argus_client.c:1700
|> |> |> |> #6 0x00003b44 in main (argc=4, argv=0xbffffc18) at
|> ./argus_main.c:238
|> |> |> |> (gdb) up
|> |> |> |> #1 0x0005c804 in ArgusCopyRecordStruct (rec=0x405234) at
|> |> |> |> ./argus_client.c:3359
|> |> |> |> 3359 bcopy (rec->dsrs[i], retn->dsrs[i],
|> |> size +
|> |> |> |> 8);
|> |> |> |> (gdb) print rec->dsrs[i]
|> |> |> |> $1 = (struct ArgusDSRHeader *) 0x45550c
|> |> |> |> (gdb) print *rec->dsrs[i]
|> |> |> |> $2 = {
|> |> |> |> type = 80 'P',
|> |> |> |> subtype = 160 '?',
|> |> |> |> dsr_un = {
|> |> |> |> fl = {
|> |> |> |> data = 130
|> |> |> |> },
|> |> |> |> vl8 = {
|> |> |> |> qual = 0 '\0',
|> |> |> |> len = 130 '?'
|> |> |> |> },
|> |> |> |> vl16 = {
|> |> |> |> len = 130
|> |> |> |> }
|> |> |> |> }
|> |> |> |> }
|> |> |> |> (gdb) print retn->dsrs[i]
|> |> |> |> $3 = (struct ArgusDSRHeader *) 0x0
|> |> |> |> (gdb) print *retn->dsrs[i]
|> |> |> |> $4 = {
|> |> |> |> type = 0 '\0',
|> |> |> |> subtype = 0 '\0',
|> |> |> |> dsr_un = {
|> |> |> |> fl = {
|> |> |> |> data = 0
|> |> |> |> },
|> |> |> |> vl8 = {
|> |> |> |> qual = 0 '\0',
|> |> |> |> len = 0 '\0'
|> |> |> |> },
|> |> |> |> vl16 = {
|> |> |> |> len = 0
|> |> |> |> }
|> |> |> |> }
|> |> |> |> }
|> |> |> |> (gdb) print *user
|> |> |> |> $5 = {
|> |> |> |> hdr = {
|> |> |> |> type = 80 'P',
|> |> |> |> subtype = 160 '?',
|> |> |> |> dsr_un = {
|> |> |> |> fl = {
|> |> |> |> data = 130
|> |> |> |> },
|> |> |> |> vl8 = {
|> |> |> |> qual = 0 '\0',
|> |> |> |> len = 130 '?'
|> |> |> |> },
|> |> |> |> vl16 = {
|> |> |> |> len = 130
|> |> |> |> }
|> |> |> |> }
|> |> |> |> },
|> |> |> |> size = 512,
|> |> |> |> count = 512,
|> |> |> |> array = "=en-us\">"
|> |> |> |> }
|> |> |> |> (gdb) print i
|> |> |> |> $6 = 12
|> |> |> |>
|> |> |> |> Peter Van Epp / Operations and Technical Support
|> |> |> |> Simon Fraser University, Burnaby, B.C. Canada
|> |> |> |>
|> |> |> |
|> |> |>
|> |> |
|> |>
|> |
|
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