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b338bce94f
created namedb*.c nameservresp.c nameservreply.c and namepacket.c added modules to Makefile, downloading dan's current version first :-) shuffled docs to match source created more docs fixed bug in announce_backup() discovered when going nameannounce.doc: backup list requests to the master browser should be used when samba is not a master browser; backup list requests to the primary domain controller should be used when samba is not a primary domain controller. fixed bug in sync_server: it would never send MasterAnnounce packets. removed the code that ignored special browser names: these should only be ignored (except 0x1b names) when broadcasted name queries are sent, not when directed registration or directed queries are sent samba as a WINS server. (note: exactly what's going on is still uncertain). renamed NAME_QUERY_MST_SRV_CHK to NAME_QUERY_PDC_SRV_CHK (more accurate). renamed NAME_STATUS_MST_SRV_CHK to NAME_STATUS_PDC_SRV_CHK (more accurate). added secured WINS name registration: a new 'state' NAME_REGISTER_CHALLENGE; functions send_name_response(), response_name_query_register(); added sending of WAIT ACKNOWLEDGEMENT packet; added a reply_to_ip field to the response record structure so that after the name query challenge, you know who to inform of the outcome of that challenge. note: these are all currently untested modifications (yikes!) lkcl (This used to be commit b50ff657ddc29b81b4aa02a597e5affab197e4f2)
107 lines
4.2 KiB
Plaintext
107 lines
4.2 KiB
Plaintext
this module deals with packets: sending, receiving, queueing
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and some basic interpretation (e.g it excludes datagram
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error packets at the moment).
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the packet queueing mechanism was originally introduced when
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samba dealt with responses by sending a packet, receiving
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packets and queueing all packets that didn't match up with
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the response expected. this is fine in a single-thread
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environment, but samba now deals with response packets by
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queueing the responses. to some extent, therefore, this
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queue_packet mechanism is redundant.
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/*************************************************************************
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send_mailslot_reply()
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*************************************************************************/
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this function is responsible for sending a MAILSLOT packet.
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it will _not_ send packets to the pseudo WINS subnet's address of
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255.255.255.255: this would be disastrous.
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each packet sent out has a unique transaction identifier. this is done
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so that responses can be matched later with the original purpose for
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the packet being sent out in the first place.
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/*************************************************************************
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listen_for_packets()
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*************************************************************************/
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this function is responsible for reading NMB and DGRAM packets, and then
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queueing them. it will normally time-out for NMBD_SELECT_LOOP seconds, but
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if there is an election currently running or we are expecting a response
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then this time is reduced to 1 second.
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note: the time-out period needs refining to the millisecond level.
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/*************************************************************************
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queue_packet()
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*************************************************************************/
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this function is responsible for queueing any NMB and DGRAM packets passed
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to it. these packets will be removed from the queue in run_packet_queue().
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/*************************************************************************
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run_packet_queue()
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*************************************************************************/
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this function is responsible for taking a packet off the queue,
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identifying whether it is an NMB or a DGRAM packet, processing
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it accordingly and deleting it. this process continues until
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there are no more packets on the queue.
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/*************************************************************************
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process_nmb()
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*************************************************************************/
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this function receives a packet identified as a netbios packet.
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it further identifies whether it is a response or a query packet.
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by identifying the type of packet (name registration, query etc)
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process_nmb() will call the appropriate function to deal with the
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type of packet received.
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/*************************************************************************
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process_dgram()
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*************************************************************************/
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this function is responsible for identifying whether the datagram
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packet received is a browser packet or a domain logon packet. it
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also does some filtering of certain types of packets (e.g it
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filters out error packets).
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/*************************************************************************
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reply_netbios_packet()
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*************************************************************************/
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this function is responsible for sending a reply to another NetBIOS
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packet from another host. it can be used to send a reply to a name
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registration, name release, name query or name status request.
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the reply can be either a positive or a negative one.
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/*************************************************************************
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initiate_netbios_packet()
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*************************************************************************/
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this function is responsible for construction a netbios packet and sending
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it. if the packet has not had a unique transaction id allocated to it,
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then initiate_netbios_packet() will give it one.
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/*************************************************************************
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update_name_trn_id()
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*************************************************************************/
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this function is responsible for allocating unique transaction identifiers
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for each new packet sent on the network.
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