[Cflowd] Problem running cflowdmux

[David Mitchell]

Greetings,

I don't know if anyone is actively supporting CFlowd at this point,
but I've run into a problem. I've compiled version 2-1-b1 from
source on a Linux box. I run cflowdmux, and it seems to start up
OK. At least according to the syslog output:

Apr 26 16:18:55 flowscan cflowdmux[31748]: [I] cflowdmux (version
cflowd-2-1-b1) started.
Apr 26 16:18:55 flowscan cflowdmux[31748]: [I] created 2101248 byte packet
queue shmem segment {CflowdPacketQueue.cc:247}
Apr 26 16:18:55 flowscan cflowdmux[31748]: [I] attached to 2101248 byte
packet queue at 0x401be000
Apr 26 16:18:55 flowscan cflowdmux[31748]: [I] created semaphore: id 0

But, it never does anything. In fact, it never even attempts to
listen for the UDP packets. In the section 'cflowd debugginer' of
the config file, it lists this type of problem as "a serious
problem which should be reported to the author", so I'm writing
in the hopes that you all can help out. The curious thing is that
if I use strace to attach to the process, it opens up the UDP
socket as soon as I attach! It never actually reads any data
though.

flowscan:/var/log# strace -p 31748
time([1019860114])                      = 1019860114
getpid()                                = 31748
rt_sigaction(SIGPIPE, {0x4016c578, [], 0x4000000}, {SIG_DFL}, 8) = 0
send(3, "<179>Apr 26 16:28:34 cflowdmux[3"..., 140, 0) = 140
rt_sigaction(SIGPIPE, {SIG_DFL}, NULL, 8) = 0
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 4
fcntl(4, F_GETFL)                       = 0x2 (flags O_RDWR)
fcntl(4, F_SETFL, O_RDWR|O_NONBLOCK)    = 0
setsockopt(4, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
setsockopt(4, SOL_SOCKET, SO_RCVBUF, [131032], 4) = 0
setsockopt(4, SOL_SOCKET, SO_RCVBUF, [196548], 4) = 0
setsockopt(4, SOL_SOCKET, SO_RCVBUF, [229306], 4) = 0
setsockopt(4, SOL_SOCKET, SO_RCVBUF, [245685], 4) = 0
setsockopt(4, SOL_SOCKET, SO_RCVBUF, [253874], 4) = 0
setsockopt(4, SOL_SOCKET, SO_RCVBUF, [257969], 4) = 0
setsockopt(4, SOL_SOCKET, SO_RCVBUF, [260016], 4) = 0
setsockopt(4, SOL_SOCKET, SO_RCVBUF, [261040], 4) = 0
setsockopt(4, SOL_SOCKET, SO_RCVBUF, [261040], 4) = 0
time([1019860114])                      = 1019860114
getpid()                                = 31748
rt_sigaction(SIGPIPE, {0x4016c578, [], 0x4000000}, {SIG_DFL}, 8) = 0
send(3, "<182>Apr 26 16:28:34 cflowdmux[3"..., 98, 0) = 98
rt_sigaction(SIGPIPE, {SIG_DFL}, NULL, 8) = 0
bind(4, {sin_family=AF_INET, sin_port=htons(9996),
sin_addr=inet_addr("0.0.0.0")}}, 16) = 0
rt_sigaction(SIGHUP, NULL, {SIG_DFL}, 8) = 0
rt_sigaction(SIGHUP, {0x804d950, [], 0x4000000}, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [HUP], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [HUP], NULL, 8) = 0
select(5, [4], NULL, NULL, {2, 0})      = 1 (in [4], left {2, 0})
time(NULL)                              = 1019860114
semop(0, 0xbffff000, 2

-- 
-----------------------------------------------------------------
| David Mitchell (mitchell@ucar.edu)       Network Engineer IV  |
| Tel: (303) 497-1845                      National Center for  |
| FAX: (303) 497-1818                      Atmospheric Research |
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