Debugging an issue with pcap_compile/pcap_setfilter

[Adayadil Thomas <adayadil.thomas () gmail com>]

Hi All,

I have a program that uses libpcap to read and analyze packets.
Libpcap version: 0.9.4

The pseudo code of my program looks like this

PacketFunc()
{

    pd = pcap_open_live( ifname, snaplen, 1, 10, errorbuf);
    if ( !pd ) {
        //error out
    }

    if(pcap_compile(pd, &fcode, filter, 1, netmask) < 0)
    {
        //error out
    }

    if(pcap_setfilter(pd, &fcode) < 0)
    {
        //error out
    }

    if(pcap_loop(pd, -1, (pcap_handler) analyze, (u_char *)&args) < 0) {
      //error out
    }

}



I get a seg fault with the following dump -


Program terminated with signal 11, Segmentation fault.
[New process 9556]
[New process 9555]
[New process 9551]
#0 0xb761807c in ?? ()
(gdb) bt
#0 0xb761807c in ?? ()
#1 0xb7fb308a in _dl_signal_error () from /lib/ld-linux.so.2
#2 0xb7fb313a in _dl_signal_cerror () from /lib/ld-linux.so.2
#3 0xb7faf3ee in _dl_lookup_symbol_x () from /lib/ld-linux.so.2
#4 0xb7fb2cc8 in _dl_fixup () from /lib/ld-linux.so.2
#5 0xb7fb84d0 in _dl_runtime_resolve () from /lib/ld-linux.so.2
#6 0xb7f7da78 in pcap_compile () from /usr/lib/libpcap.so.0.9.4
#7 0x0804bbe5 in PacketFunc (t_id=0x1) at program.c:959
#8 0xb7f6449b in start_thread () from /lib/libpthread.so.0
#9 0xb7eec42e in clone () from /lib/libc.so.6

The following message was found in log file :

symbol lookup error: /usr/lib/libpcap.so.0.9.4: undefined symbol: lex_cleanup



Any ideas or pointers to what the issue may be?

Thanks
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