nmbd/nmbd_namequery.c

ソースコードを見る。

関数
static void	query_name_response (struct subnet_record *subrec, struct response_record *rrec, struct packet_struct *p)
static void	query_name_timeout_response (struct subnet_record *subrec, struct response_record *rrec)
static BOOL	query_local_namelists (struct subnet_record *subrec, struct nmb_name *nmbname, struct name_record **namerecp)
BOOL	query_name (struct subnet_record *subrec, const char *name, int type, query_name_success_function success_fn, query_name_fail_function fail_fn, struct userdata_struct *userdata)
BOOL	query_name_from_wins_server (struct in_addr ip_to, const char *name, int type, query_name_success_function success_fn, query_name_fail_function fail_fn, struct userdata_struct *userdata)

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関数

static void query_name_response	(	struct subnet_record *	subrec,
		struct response_record *	rrec,
		struct packet_struct *	p
	)			[static]

nmbd_namequery.c の 30 行で定義されています。

参照先 nmb_packet::answers・dbgtext()・response_record::fail_fn・nmb_packet::header・packet_struct::ip・packet_struct::nmb・nmb_namestr()・response_record::num_msgs・nmb_packet::opcode・response_record::packet・packet_struct::packet・nmb_packet::question・nmb_packet::question_name・nmb_packet::rcode・res_rec::rdata・response_record::repeat_count・response_record::repeat_time・subnet_record::subnet_name・response_record::success_fn・packet_struct::timestamp・res_rec::ttl・response_record::userdata・zero_ip().

参照元 query_name()・query_name_from_wins_server().

{
        struct nmb_packet *nmb = &p->packet.nmb;
        BOOL success = False;
        struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
        struct in_addr answer_ip;

        zero_ip(&answer_ip);

        /* Ensure we don't retry the query but leave the response record cleanup
                to the timeout code. We may get more answer responses in which case
                we should mark the name in conflict.. */
        rrec->repeat_count = 0;

        if(rrec->num_msgs == 1) {
                /* This is the first response. */

                if(nmb->header.opcode == NMB_WACK_OPCODE) {
                        /* WINS server is telling us to wait. Pretend we didn't get
                                the response but don't send out any more query requests. */

                        if( DEBUGLVL( 5 ) ) {
                                dbgtext( "query_name_response: " );
                                dbgtext( "WACK from WINS server %s ", inet_ntoa(p->ip) );
                                dbgtext( "in querying name %s ", nmb_namestr(question_name) );
                                dbgtext( "on subnet %s.\n", subrec->subnet_name );
                        }
  
                        rrec->repeat_count = 0;
                        /* How long we should wait for. */
                        if (nmb->answers) {
                                rrec->repeat_time = p->timestamp + nmb->answers->ttl;
                        } else {
                                /* No answer - this is probably a corrupt
                                   packet.... */
                                DEBUG(0,("query_name_response: missing answer record in "
                                        "NMB_WACK_OPCODE response.\n"));
                                rrec->repeat_time = p->timestamp + 10;
                        }
                        rrec->num_msgs--;
                        return;
                } else if(nmb->header.rcode != 0) {

                        success = False;

                        if( DEBUGLVL( 5 ) ) {
                                dbgtext( "query_name_response: On subnet %s ", subrec->subnet_name );
                                dbgtext( "- negative response from IP %s ", inet_ntoa(p->ip) );
                                dbgtext( "for name %s. ", nmb_namestr(question_name) );
                                dbgtext( "Error code was %d.\n", nmb->header.rcode );
                        }
                } else {
                        if (!nmb->answers) {
                                dbgtext( "query_name_response: On subnet %s ", subrec->subnet_name );
                                dbgtext( "IP %s ", inet_ntoa(p->ip) );
                                dbgtext( "returned a success response with no answer\n" );
                                return;
                        }

                        success = True;

                        putip((char *)&answer_ip,&nmb->answers->rdata[2]);
        
                        if( DEBUGLVL( 5 ) ) {
                                dbgtext( "query_name_response: On subnet %s ", subrec->subnet_name );
                                dbgtext( "- positive response from IP %s ", inet_ntoa(p->ip) );
                                dbgtext( "for name %s.  ", nmb_namestr(question_name) );
                                dbgtext( "IP of that name is %s\n", inet_ntoa(answer_ip) );
                        }

                        /* Interestingly, we could add these names to our namelists, and
                                change nmbd to a model that checked its own name cache first,
                                before sending out a query. This is a task for another day, though.
                        */
                }
        } else if( rrec->num_msgs > 1) {

                if( DEBUGLVL( 0 ) ) {
                        if (nmb->answers)
                                putip( (char *)&answer_ip, &nmb->answers->rdata[2] );
                        dbgtext( "query_name_response: " );
                        dbgtext( "Multiple (%d) responses ", rrec->num_msgs );
                        dbgtext( "received for a query on subnet %s ", subrec->subnet_name );
                        dbgtext( "for name %s.\nThis response ", nmb_namestr(question_name) );
                        dbgtext( "was from IP %s, reporting ", inet_ntoa(p->ip) );
                        dbgtext( "an IP address of %s.\n", inet_ntoa(answer_ip) );
                }

                /* We have already called the success or fail function, so we
                        don't call again here. Leave the response record around in
                        case we get more responses. */

                return; 
        }
  
        if(success && rrec->success_fn)
                (*(query_name_success_function)rrec->success_fn)(subrec, rrec->userdata, question_name, answer_ip, nmb->answers);
        else if( rrec->fail_fn)
                (*(query_name_fail_function)rrec->fail_fn)(subrec, rrec, question_name, nmb->header.rcode);

}

static void query_name_timeout_response	(	struct subnet_record *	subrec,
		struct response_record *	rrec
	)			[static]

nmbd_namequery.c の 138 行で定義されています。

参照先 dbgtext()・response_record::fail_fn・failed・packet_struct::nmb・nmb_namestr()・response_record::num_msgs・packet_struct::packet・response_record::packet・nmb_packet::question・nmb_packet::question_name・remove_response_record()・subnet_record::subnet_name.

参照元 query_name()・query_name_from_wins_server().

{
        struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
        /* We can only fail here, never succeed. */
        BOOL failed = True;
        struct nmb_name *question_name = &sent_nmb->question.question_name;

        if(rrec->num_msgs != 0) {
                /* We got at least one response, and have called the success/fail
                        function already. */

                failed = False; 
        }

        if(failed) {
                if( DEBUGLVL( 5 ) ) {
                        dbgtext( "query_name_timeout_response: No response to " );
                        dbgtext( "query for name %s ", nmb_namestr(question_name) );
                        dbgtext( "on subnet %s.\n", subrec->subnet_name );
                }

                if(rrec->fail_fn)
                        (*(query_name_fail_function)rrec->fail_fn)(subrec, rrec, question_name, 0);
        }

        remove_response_record(subrec, rrec);
}

static BOOL query_local_namelists	(	struct subnet_record *	subrec,
		struct nmb_name *	nmbname,
		struct name_record **	namerecp
	)			[static]

nmbd_namequery.c の 172 行で定義されています。

参照先 name_record::data・find_name_in_lmhosts()・find_name_on_subnet()・LMHOSTS_NAME・SELF_NAME・nmb_data::source.

参照元 query_name().

{
        struct name_record *namerec;

        *namerecp = NULL;

        if(find_name_in_lmhosts(nmbname, namerecp))
                return True;
  
        if((namerec = find_name_on_subnet(subrec, nmbname, FIND_ANY_NAME))==NULL)
                return False;

        if( NAME_IS_ACTIVE(namerec) && ( (namerec->data.source == SELF_NAME) || (namerec->data.source == LMHOSTS_NAME) ) ) {
                *namerecp = namerec;
                return True;
        } 
        return False;
}

BOOL query_name	(	struct subnet_record *	subrec,
		const char *	name,
		int	type,
		query_name_success_function	success_fn,
		query_name_fail_function	fail_fn,
		struct userdata_struct *	userdata
	)

nmbd_namequery.c の 196 行で定義されています。

参照先 name_record::data・dbgtext()・nmb_data::ip・make_nmb_name()・nmb_data::nb_flags・nmb_namestr()・nmb_data::num_ips・query_local_namelists()・query_name_response()・query_name_timeout_response()・queue_query_name()・set_nb_flags().

参照元 announce_and_sync_with_domain_master_browser()・become_domain_master_browser_bcast()・become_domain_master_browser_wins()・check_master_browser_exists()・collect_all_workgroup_names_from_wins_server()・make_wins_proxy_name_query_request().

{
        struct nmb_name nmbname;
        struct name_record *namerec;

        make_nmb_name(&nmbname, name, type);

        /*
         * We need to check our local namelists first.
         * It may be an magic name, lmhosts name or just
         * a name we have registered.
         */

        if(query_local_namelists(subrec, &nmbname, &namerec) == True) {
                struct res_rec rrec;
                int i;

                memset((char *)&rrec, '\0', sizeof(struct res_rec));

                /* Fake up the needed res_rec just in case it's used. */
                rrec.rr_name = nmbname;
                rrec.rr_type = RR_TYPE_NB;
                rrec.rr_class = RR_CLASS_IN;
                rrec.ttl = PERMANENT_TTL;
                rrec.rdlength = namerec->data.num_ips * 6;
                if(rrec.rdlength > MAX_DGRAM_SIZE) {
                        if( DEBUGLVL( 0 ) ) {
                                dbgtext( "query_name: nmbd internal error - " );
                                dbgtext( "there are %d ip addresses ", namerec->data.num_ips );
                                dbgtext( "for name %s.\n", nmb_namestr(&nmbname) );
                        }
                        return False;
                }

                for( i = 0; i < namerec->data.num_ips; i++) {
                        set_nb_flags( &rrec.rdata[i*6], namerec->data.nb_flags );
                        putip( &rrec.rdata[(i*6) + 2], (char *)&namerec->data.ip[i]);
                }

                /* Call the success function directly. */
                if(success_fn)
                        (*(query_name_success_function)success_fn)(subrec, userdata, &nmbname, namerec->data.ip[0], &rrec);
                return False;
        }

        if(queue_query_name( subrec, query_name_response, query_name_timeout_response, success_fn, fail_fn, userdata, &nmbname) == NULL) {
                if( DEBUGLVL( 0 ) ) {
                        dbgtext( "query_name: Failed to send packet " );
                        dbgtext( "trying to query name %s\n", nmb_namestr(&nmbname) );
                }
                return True;
        }
        return False;
}

BOOL query_name_from_wins_server	(	struct in_addr	ip_to,
		const char *	name,
		int	type,
		query_name_success_function	success_fn,
		query_name_fail_function	fail_fn,
		struct userdata_struct *	userdata
	)

nmbd_namequery.c の 258 行で定義されています。

参照先 dbgtext()・make_nmb_name()・nmb_namestr()・query_name_response()・query_name_timeout_response()・queue_query_name_from_wins_server().

参照元 wins_process_multihomed_name_registration_request()・wins_process_name_registration_request().

{
        struct nmb_name nmbname;

        make_nmb_name(&nmbname, name, type);

        if(queue_query_name_from_wins_server( ip_to, query_name_response, query_name_timeout_response, success_fn, fail_fn, userdata, &nmbname) == NULL) {
                if( DEBUGLVL( 0 ) ) {
                        dbgtext( "query_name_from_wins_server: Failed to send packet " );
                        dbgtext( "trying to query name %s\n", nmb_namestr(&nmbname) );
                }
                return True;
        }
        return False;
}

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