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Comment # 9 on bug 9962 from Guy Harris

Actually, lbm_channel_is_known() checks
lbm_channel_is_unknown_transport_lbttcp(), which checks both
lbm_channel_is_unknown_transport_source_lbttcp() and
lbm_channel_is_unknown_transport_client_lbttcp().

So lbm_channel_is_unknown_transport_lbttcp(channel) will be true if
lbm_channel_is_unknown_transport_source_lbttcp(channel) is true or
lbm_channel_is_unknown_transport_client_lbttcp(channel) is true.

So:

lbm_channel_is_known() is:

gboolean lbm_channel_is_known(guint64 channel)
{
    return (!lbm_channel_is_unknown_transport_lbttcp(channel) &&
!lbm_channel_is_unknown_stream_tcp(channel));
}

so it'll be false iff lbm_channel_is_unknown_transport_lbttcp(channel) is true
or lbm_channel_is_unknown_stream_tcp(channel) is true, so it'll be false if any
of lbm_channel_is_unknown_transport_source_lbttcp(channel),
lbm_channel_is_unknown_transport_client_lbttcp(channel), or
lbm_channel_is_unknown_stream_tcp(channel) are true.

So we know that:

    one of lbm_channel_is_unknown_transport_source_lbttcp(channel),
lbm_channel_is_unknown_transport_client_lbttcp(channel), or
lbm_channel_is_unknown_stream_tcp(channel) is true;

    lbm_channel_is_unknown_transport_source_lbttcp(channel) is not true;

    lbm_channel_is_unknown_transport_client_lbttcp(channel) is not true;

so lbm_channel_is_unknown_stream_tcp(channel) is true.

So if channel is LBM_CHANNEL_UNKNOWN_STREAM_TCP:

    lbm_channel_is_unknown_transport_source_lbttcp(channel) is false, so the
address and port won't be set from the TCP source;

    lbm_channel_is_unknown_transport_client_lbttcp(channel) is false, so the
address and port won't be set from the TCP destination;

    both of those are false, so
lbm_channel_is_unknown_transport_lbttcp(channel) is false;

    lbm_channel_is_unknown_transport_lbttcp(channel) is false,
lbm_channel_is_unknown_stream_tcp(channel) is true, so
lbm_channel_is_known(channel) is false, so, on the first pass, if
tcp_sid_info.set is true, *boom*.

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