❦ 5 octobre 2013 12:55 CEST, Michael Braun <michael-...@fami-braun.de> :
> I'm running lldpd and tried to identify the local switchport by running
> lldpctl.
> However, lldpctl just hands. Tracing lldpd and lldpctl, it looks like lldpctl
> sends a message to lldpd and lldpd then discards the message (the message is
> received unmodified) with the following error:
>
> select(8, [6 7], NULL, NULL, {23, 239245}) = 1 (in [7], left {20, 944351})
> recvfrom(7,
> "\1\200\302\0\0\16x\254\300\344\376{\210\314\2\7\4x\254\300\344\356\0\4\4\007133\6\2\0"...,
> 1500, 0, {sa_family=AF_PACKET, proto=0x88cc, if2, pkttype=PACKET_MULTICAST,
> addr(6)={1, 78acc0e4fe7b}, [18]) = 276
> time(NULL) = 1380970074
> time(NULL) = 1380970074
> select(8, [6 7], NULL, NULL, {21, 0}^C <unfinished ...>
> Process 9127 detached
> root@logserver:~# strace -f -p 9127 -s 65535
> Process 9127 attached - interrupt to quit
> select(8, [6 7], NULL, NULL, {14, 301586}) = 1 (in [6], left {7, 351326})
> accept(6, 0, NULL) = 8
> time(NULL) = 1380970088
> select(9, [6 7 8], NULL, NULL, {7, 0}) = 1 (in [8], left {6, 999068})
> recv(8, "\1\0\0\0\0\0\335#\0\0", 8192, 0) = 10
> time(NULL) = 1380970088
> send(3, "<26>Oct 5 12:48:08 lldpd[9127]: client_handle_client: too short
> message request received", 89, MSG_NOSIGNAL) = 89
> time(NULL) = 1380970088
> select(9, [6 7 8], NULL, NULL, {7, 0}) = 1 (in [8], left {5, 140363})
> recv(8, "", 8192, 0) = 0
> close(8) = 0
> time(NULL) = 1380970090
You say the message is received unmodified but I think you omit a part
of the trace. We see that a 10 bytes message is received by lldpd but I
don't see if the same message is sent by lldpctl.
I am unable to reproduce this on a clean wheezy. Do you have this
problem on all your hosts or only one in particular?
The message "too short message request received" is here because you
received a request that is too short to even contain the message header.
struct hmsg_hdr {
enum hmsg_type type;
int16_t len;
pid_t pid;
};
type is at least one byte, but there is padding, so two bytes, two bytes
for len and four bytes for pid, so eight bytes. Maybe enum is 4 bytes,
then 2 bytes for len, 2 bytes for padding and 4 bytes for pid_t, so 12
bytes. I don't see when this struct could be 10 bytes but let's assume
that's possible. Maybe there is a mismatch between lldpctl and lldpd.
Could you check that lldpd and lldpctl are from the right package:
dpkg -S $(which lldpctl)
dpkg -S $(which lldpd)
sudo ls -l /proc/$(pidof -s lldpd)/exe
debsums lldpd
sudo lsof -n | grep lldpd | grep /usr/sbin/lldpd
ls -li /usr/sbin/lldpd
--
Use data arrays to avoid repetitive control sequences.
- The Elements of Programming Style (Kernighan & Plauger)
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