JP2004187034A - System and method for solving pier resource - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pier resource solving system which can realize pier resource retrieve at a low cost and is excellent in followability to pier generation and elimination. <P>SOLUTION: This pier resource solving system is provided with a P2P resource registering part 252 for registering a P2P resource retrieving part 250 in a P2P domain name record 300, a P2P resource inquiring part 120 for transmitting a pier inquiry request, a DNS resource inquiring part 150 for converting the pier inquiry request into a DNS resource inquiry request, a domain server 30 for performing static resource retrieval on the basis of registered information of the P2P domain name record 300, the P2P resource retrieving part 250 for converting the DNS resource inquiry request into a pier response request, simultaneously transmitting the pier response request to responding side pier groups 21 to 24 and dynamically retrieving pier resources, and a P2P resource request responding part 240 for returning a pier response for the pier response request. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a system for resolving P2P resources in a peer-to-peer (P2P) network, and more particularly to a system for resolving resources of a peer belonging to one network from a peer belonging to one network.
[0002]
[Prior art]
In order to perform communication between terminals connected by a network, a terminal of a communication destination must be specified by some method. As a method of specifying the terminal of the communication destination, for example, in an IP (Internet Protocol) network, a 32-bit unique IP address such as “192.168.0.1” is assigned to each terminal and this IP address is used. There is a method to specify the terminal.
[0003]
However, such a sequence of numbers is difficult for a human to remember and is difficult to handle. Therefore, using a directory service such as DNS (Domain Name System), the terminal name (domain name) represented by an easy-to-understand character string is converted to the IP address. A name resolution method of determining an address is used. Deriving other necessary attribute information on the communication destination terminal from one attribute information (resource) on the communication destination terminal by the directory service in this way is called resource resolution, and the name resolution described above is one of the resource solutions. Are in a relationship.
[0004]
Here, DNS will be described as a general directory service.
When the client terminal sends an inquiry request to the DNS server by designating the client terminal name of the communication destination, the DNS server associates the client terminal name with the IP address assigned to the client terminal by A (host Address). ) Record (in the case of IPv6, it is an AAAA record or an A6 record. Hereinafter, simply referred to as an "A record"), a system for performing name resolution from a designated client terminal name to an IP address. Yes, DNS servers are arranged in a tree-like hierarchy.
[0005]
More specifically, the hierarchical DNS server group internally stores an A record in which a client terminal name and an IP address managed by the DNS server are associated with each other. Browse records. Here, if the client terminal name specified in the A record held by itself is hit, the DNS server performs name resolution and returns an inquiry result to the client terminal, that is, returns the IP address of the client terminal of the communication destination. If the specified client terminal name is not hit in the A record held by itself, the packet is forwarded to the upper DNS server, and the same processing is repeated between the DNS servers. Finally, the specified client terminal name is hit. The query result obtained from the DNS server is returned to the client terminal. In this way, it is possible to perform communication between client terminals by performing resource resolution using name resolution by DNS (for example, see Non-Patent Documents 1 and 2).
[0006]
In addition, DNS name resolution requires that a client terminal name and an IP address be associated with each other and registered in an A record in a DNS server. A static DNS in which the client terminal name and each IP address are registered in association with each other, and a dynamic DNS in which each client terminal enters (registers) the client terminal name and the IP address in an A record in the DNS server at startup. DNS (dynamic DNS).
[0007]
In this dynamic DNS, when each client terminal disappears from the network due to the termination processing, it is necessary to access the DNS server and delete the entry and update the A record before the termination processing (for example, see Non-Patent Reference 3).
[0008]
On the other hand, even in a P2P (Peer to Peer) network that enables an unspecified number of terminal devices (peers) to communicate with each other, a unique peer address is assigned to each peer, and this peer address is assigned. There is a method to specify the peer using the Since this peer address is also a sequence of unique numbers similarly to the above-mentioned IP address, a name resolution method of calculating a peer address from a peer name of a character string that is easy to understand even in a P2P network is used for a resource resolution procedure. It is possible.
[0009]
In this case, as a first method for performing name resolution in a P2P network, a peer solution is formed by a static solution, that is, an autonomous system such as each ISP (Internet Service Provider), that is, a so-called AS (Autonomous System) unit. A method is conceivable in which a directory service is provided, P2P records in which peer names and peer addresses are associated with each other are exchanged with each other to cooperate with each peer group, and perform name resolution from peer names to peer addresses.
[0010]
Also, as a second method, a dynamic name resolution such as a dynamic DNS, that is, when a peer starts up with a DNS server or the like already operating in the AS, a P2P record held by the DNS server is stored in the P2P record. A method of dynamically entering a peer name and a peer address is conceivable.
[0011]
Furthermore, as a third method, a DNS server or the like that holds a P2P record is installed on a LAN (Local Area Network) that configures a peer network, and the peer name and the peer address are dynamically stored in the P2P record when each peer starts up. , And registering this DNS server in an A record in the DNS server already running in the ISP as a name server managing the P2P network.
[0012]
[Non-patent document 1]
Paul Mockapetris, "Request for Comments 1034. Domain Names-Concepts and Facilities 1034. DOMAIN NAMES-CONCEPTS AND FACILITIES", Internet Engineering Task Force, Internet Age 11E, USA. Monthly publication, p5-7, etc. [Retrieved November 1, 2002], Internet <URL: ftp: // ftp. rfc-editor. org / in-notes / rfc1034. txt>
[0013]
[Non-patent document 2]
Paul Mockapetris, "Request for Comments 1035, Domain Name-Implementation and Specification (Request for Comments 1035, DOMAIN NAMES-IMPLEMENTATION AND SPECIFICATIONs)", Internet Engineering Task Force, Internet Engineering Task Force , November 1987, p2, etc., [Searched November 1, 2002], Internet
<URL: ftp: // ftp. rfc-editor. org / in-notes / rfc1035. txt>
[0014]
[Non-Patent Document 3]
Paul Vixie and four other authors, "Request for Comments 2136, Dynamic Updates in the Domain Name System," Internet Engineering Task Force, Internet Engineering Task Force, Internet Engine Task Force Published in April, 2002, p3, etc. [searched on November 1, 2002], Internet <URL: ftp: // ftp. rfc-editor. org / in-notes / rfc2136. txt>
[0015]
[Problems to be solved by the invention]
However, according to the first method, a network system for constructing a server for managing a peer group and for mutually exchanging P2P records and dynamically cooperating between the servers for managing the peer group is provided. There is a problem that it is necessary to newly construct, and the cost required for the construction and operation increases.
[0016]
Further, according to the second method, entry requests from an unspecified number of peers are concentrated on the DNS server in the AS, so that the processing speed of the existing DNS server is significantly reduced. is there. On the other hand, if the processing speed of the DNS server is to be maintained, there is also a problem that the cost of adding an existing system increases.
[0017]
Furthermore, according to the third method, since a directory service such as DNS is installed on the LAN, an administrator for managing the network is required, and a directory service such as constructing a DNS server is required. Since the cost for operating the system increases, there is a problem that when introducing the system to a home LAN or the like, the users are limited to those having advanced network management technology.
[0018]
According to the method of dynamically entering the peer name and the peer address in the P2P record as in the second and third methods, the terminal performs a termination process due to a freeze or the like due to a terminal system error. In the case where the peer disappears from the network without first being created, there is a problem that the generation or disappearance of each peer cannot be immediately reflected in the P2P record, for example, entries of peers that do not exist in the P2P record remain.
[0019]
Therefore, the present invention has been made in view of such a problem, and a peer resource search which can realize a search for a peer resource without incurring an additional cost and has excellent followability to generation and disappearance of a peer. The purpose is to provide a system.
[0020]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following technical means.
That is, in a peer-to-peer communication between a first peer terminal in a first network and a second peer terminal in a second network, the peer resource solving system according to the present invention uses the peer information based on resource information indicating one attribute of the peer terminal. A peer resource resolution system for deriving resource resolution information indicating other attributes of a terminal, the resource being connected to the first network and inquiring about the resource information on the second peer terminal for deriving the resource resolution information. An inquiry device, a resource search device connected to the second network, searching for the second peer terminal based on the resource information about the second peer, and returning a search result to the resource inquiry device; Intermediate between one network and the second network 3 is connected to a network, and a domain server which provides a predetermined directory service to the second network.
[0021]
Here, as one embodiment of the present invention, the first peer terminal transmits an inquiry message indicating an inquiry about the resource information to the resource inquiry device according to a predetermined first protocol; Response message receiving means for receiving, from the resource inquiry device, a response message including the resource resolution information on the second peer terminal according to the first protocol, wherein the resource inquiry device is configured to execute the first Resource inquiry means for transmitting the inquiry message received from the peer terminal to the resource search device according to a second protocol for performing communication with the domain server; and a resource inquiry device transmitted from the resource search device according to the second protocol. The response message Receiving a di-, and a response message forwarding unit configured to transmit the response message to the first peer terminal in accordance with the first protocol.
[0022]
As another embodiment of the present invention, the resource search device receives an inquiry message indicating that the inquiry is about the resource information transmitted from the resource inquiry device according to the second protocol, and the inquiry message Resource search means for transmitting to the second peer terminal according to the first protocol, and a response message containing the resource resolution information on the second peer terminal received from the second peer terminal according to the first protocol, Resource response transmission means for transmitting to the resource inquiry device according to the two protocols, wherein the second peer terminal receives the inquiry message transmitted from the resource search device according to the first protocol. And the received inquiry message Resource resolution means for analyzing the resource information included in the message and deriving the resource resolution information, and response message transmission means for generating the response message including the resource resolution information and transmitting the response message to the resource search device according to the first protocol And
[0023]
Further, as still another embodiment of the present invention, a combination of the above two embodiments may be provided. Here, the domain server is configured to transmit the predetermined directory service from the resource inquiry device according to the second protocol. The transmitted inquiry message is transferred to the resource search device, and the response message transmitted from the resource search device is transferred to the resource inquiry device.
[0024]
Further, the present invention can also be realized as a peer resource solving method in which each component in the peer resource solving system is a step, and is realized as a program for causing a computer to execute each step or a recording medium recording the program. You can also.
[0025]
Furthermore, the present invention can also be realized as a resource inquiry device having characteristic means in a peer resource resolution system, or as a resource search device having characteristic means in a peer resource resolution system.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail, but these are for the purpose of illustration, and the present invention is not limited thereto.
[0027]
(Embodiment 1)
First, a peer resource solving system according to Embodiment 1 of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an overall configuration of a peer resource solving system 1 according to the first embodiment.
[0028]
The peer resource solving system 1 is a system that realizes a search for peer resources in a P2P network at low cost and solves peer resources. Here, the resolution of the peer resource refers to deriving other necessary attribute information from one attribute information regarding the peer, and in this specification, when deriving a peer address from a peer name to establish peer-to-peer communication Will be described as an example.
[0029]
The peer resource solving system 1 includes a query P2P network 10 for inquiring a peer resource, a responding P2P network 20 for responding to a query for a peer resource, and a directory in the responding P2P network 20. It comprises a P2P domain server 30 for providing services and a wide area network 40. Here, it is assumed that the directory service provided to the responding P2P network 20 is DNS, and that the wide area network 40 is an IP network and is performing communication according to the TCP / IP protocol.
[0030]
The inquiry-side P2P network 10 is a P2P-type LAN that has a plurality of peers in a home or the like and enables communication between the peers, and includes inquiry-side peers 11 to 14 that inquire about peer resources, and peer resources. And an inquiry-side communication device 15 that transmits the inquiry to the outside of the LAN, that is, to a WAN (Wide Area Network).
[0031]
Note that, in the inquiry side P2P network 10, communication between the peers is performed by a P2P network protocol different from the TCP / IP protocol.
[0032]
The inquiry-side peers 11 to 14 are terminal devices physically connected in the inquiry-side P2P network 10 and are home appliances such as a personal computer, a TV compatible with a network connection, and a video recorder with a built-in hard disk. It has a CPU and the like. Each of the inquiry-side peers 11 to 14 is provided with an interface for inputting a peer name or the like as a communication destination, and transmits the input peer name or the like as a peer inquiry request. Note that examples of the interface include a keyboard, a mouse, and a TV remote controller.
[0033]
The inquiry-side communication device 15 is a communication device such as a broadband router that enables communication between the inquiry-side P2P network 10 and the wide area network 40. The inquiry-side communication device 15 includes a CPU, a memory, and the like, and functions as a gateway device in the inquiry-side P2P network 10. Function. The inquiry-side communication device 15 is connected to a domain server (not shown) of the inquiry-side P2P network 10, acquires a peer inquiry request from the inquiry-side peers 11 to 14, converts the request into a DNS resource inquiry request, A DNS resource inquiry request is transmitted to the domain server of the inquiry side P2P network 10. Thereafter, this DNS resource inquiry request is transmitted to the P2P domain server 30 via the wide area network 40 in which an unspecified DNS server is interposed.
[0034]
The responding P2P network 20 is composed of a plurality of terminal devices at home or the like, is a P2P-type LAN that enables communication between the terminal devices, and includes a responding peer 21 to 24 responding to an inquiry about a peer resource. , A response-side communication device 25 that receives a peer resource inquiry from the WAN and transmits a response to the peer resource inquiry to the WAN.
[0035]
It is assumed that communication between the peers is also performed within the responding P2P network 20 using the same P2P network protocol as that of the inquiry P2P network 10.
[0036]
The responding peers 21 to 24 are a group of terminal devices physically connected in the responding P2P network 20, and are home electric appliances such as a personal computer and a digital video camera compatible with the network connection. Is provided inside.
[0037]
The response-side communication device 25 is a communication device such as a broadband router that enables communication between the response-side P2P network 20 and the P2P domain server 30. The response-side communication device 25 includes a CPU, a memory, and the like, and is a gateway device in the response-side P2P network 20. Function as The responding communication device 25 is connected to a P2P domain server 30 which is a domain server of the responding P2P network 20, acquires a DNS resource inquiry request from the P2P domain server 30, converts it into a peer response request, To the side peers 21-24. In addition, the responding communication device 25 acquires a peer response from the responding peers 21 to 24, converts it into a DNS resource inquiry response, and transmits the DNS resource inquiry response to the P2P domain server 30.
[0038]
The P2P domain server 30 is a DNS server device that provides a directory service to the responding P2P network 20, and is connected to the wide area network 40 and can communicate with each other. The P2P domain server 30 also provides a directory service to a plurality of P2P networks such as the P2P network 20b in addition to the responding P2P network 20.
[0039]
Next, the function of each component will be described in more detail with reference to FIG.
FIG. 2 is a functional block diagram of each component in the peer resource solving system 1 according to the first embodiment.
[0040]
First, in the query-side P2P network 10, the query-side peer 12 includes a P2P resource query unit 120. The P2P resource inquiry unit 120 is a processing unit that generates a peer inquiry request conforming to the P2P network protocol and transmits the request to the inquiry-side communication device 15, and is realized by a program or the like stored in the internal memory of the inquiry-side peer 12. Is done. Here, the peer inquiry request is a packet including a peer name input from the input interface of the inquiry peer 12 or its own peer name, and is generated according to the P2P network protocol. Although not shown in FIG. 2, the other inquiring peers 11, 13, and 14 also include the P2P resource inquiry unit 120.
[0041]
In addition, the inquiry communication device 15 includes a DNS resource inquiry unit 150. The DNS resource inquiry unit 150 acquires a peer inquiry request from the P2P resource inquiry unit 120 of the inquiry peer 12, performs a protocol conversion to the DNS resource inquiry request in accordance with the TCP / IP protocol, and obtains a domain of the inquiry P2P network 10. It is a processing unit that transmits to the server. The DNS resource inquiry unit 150 is realized by software or the like mounted on the inquiry communication device 15 such as a broadband router. The DNS resource inquiry request is a packet including information included in the peer inquiry request, and is generated according to the TCP / IP protocol.
[0042]
Here, the protocol conversion from the peer inquiry request to the DNS resource inquiry request will be described with reference to FIG.
FIG. 3 is a diagram schematically illustrating a protocol conversion process in the peer resource solving system 1 according to the first embodiment.
[0043]
The P2P network protocol 100 includes a P2P header 101 and P2P data 102. The P2P header 101 further includes a P2P message type 103, a destination peer name 104, a destination P2P domain name 105, and a source peer address 106. And a source peer name 107, etc., and a predetermined number of bits are assigned to each item.
[0044]
The P2P message type 103 indicates that the inquiry is a peer resource inquiry.
The destination peer name 104 indicates the name of a peer that is a communication destination.
[0045]
The transmission destination P2P domain name 105 indicates the P2P domain name of the communication destination.
The source peer address 106 and the like indicate its own peer address and the like.
In this way, a peer inquiry request is generated.
[0046]
On the other hand, the TCP / IP protocol 110 includes a TCP / IP header 111 and TCP / IP data 112. Further, the TCP / IP data 112 includes a DNS message header 114, an inquiry DNS resource 115, and a DNS resource response 116. And the like, and includes a DNS inquiry 113 and the like, and a predetermined number of bits is assigned to each item.
[0047]
The DNS message header 114 is information indicating that a resource inquiry is made to the DNS server.
The inquiry DNS resource 115 indicates the name of the DNS resource to be inquired.
[0048]
In this way, a DNS resource inquiry request is generated.
That is, the information stored in the P2P message type 103 in the P2P network protocol 100 is stored in the DNS message header 114 in the TCP / IP protocol 110, and the information is stored in the destination peer name 104 and the destination P2P domain name 105 in the P2P network protocol 100. The stored information is stored in the inquiry DNS resource 115 in the TCP / IP protocol 110, and furthermore, the TCP / IP header 111 and the like are added, or unnecessary information is deleted. The protocol conversion from the peer inquiry request to the DNS resource inquiry request is performed while maintaining the property.
[0049]
Next, referring to FIG. 2 again, in the responding P2P network 20, the responding peer 24 includes a P2P resource inquiry responding unit 240. The P2P resource inquiry response unit 240 obtains and analyzes a peer response request in accordance with the P2P network protocol from the responding communication device 25, determines whether or not it matches its own peer name. Is a processing unit for performing name resolution from a peer name to a peer address and transmitting a peer response to the responding communication device 25 in accordance with the P2P network protocol. The P2P resource inquiry response unit 240 is realized by a program or the like stored in the internal memory of the response peer 24. Here, the peer response is a packet including information indicating that the peer resource has been resolved and the peer name and the peer address of the responding peer 24, and is generated in accordance with the P2P network protocol. Although not shown in FIG. 2, the other responding peers 21 to 23 also include the P2P resource inquiry responding unit 240.
[0050]
Further, the responding communication device 25 includes a P2P resource search unit 250 and a P2P resource registration unit 252.
The P2P resource search unit 250 functions as a name server of the P2P domain of the responding P2P network 20 and is a processing unit that dynamically searches for a peer to be queried in the responding P2P network 20. This is realized by implemented software or the like. The P2P resource search unit 250 obtains a DNS resource inquiry request according to the TCP / IP protocol from the P2P domain server 30, converts the request into a peer response request according to the P2P network protocol, and converts the peer response request into a response side. It transmits all at once to the responding peers 21 to 24 in the P2P network. Here, the peer response request is a packet including information requesting name resolution toward the responding peers 21 to 24 and a peer name requesting a response, and is generated in accordance with the P2P network protocol.
[0051]
Further, the P2P resource search unit 250 acquires a peer response according to the P2P network protocol from the responding peers 21 to 24, performs protocol conversion into a DNS resource inquiry response according to the TCP / IP protocol, and Send to Here, the DNS resource inquiry response is a packet including information included in the peer response, and is generated according to the TCP / IP protocol.
[0052]
Note that the protocol conversion from the DNS resource inquiry request to the peer response request in the P2P resource search unit 250 is performed in a direction opposite to the conversion direction shown in FIG. In the protocol conversion from the peer response to the DNS resource inquiry response, a conversion process in the same direction as the conversion direction shown in FIG. 3 is performed. Then, the DNS resource response 116 shown in FIG. 3 indicates one of the peer addresses of the responding peers 21 to 24.
[0053]
Further, the P2P resource search unit 250 includes a cache memory 251. The cache memory 251 is, for example, a RAM (Random Access Memory) that stores a peer name and a peer address included in the peer inquiry response acquired from the responding peers 21 to 24 by the P2P resource search unit 250 in association with each other. By providing the cache memory 251, when there is a resource inquiry request to the same peer in the responding P2P network 20, the peer to be queried is statically searched based on the result stored in the cache memory 251. can do.
[0054]
The P2P resource registration unit 252 is a processing unit that registers the P2P resource search unit 250 as a name server of the responding P2P network 20 in the P2P domain server 30, and is realized by software or the like mounted on the responding communication device 25. You. The P2P resource registration unit 252 transmits information indicating the P2P resource search unit 250 to the P2P domain server 30 when the responding communication device 25 is activated. Here, the information indicating the P2P resource search unit 250 is a unique address for identifying the P2P resource search unit 250 that the P2P domain server 30 functions as a name server of the P2P domain and transmits a DNS resource inquiry request to. In the first embodiment, for example, it is the global IP address of the responding communication device 25.
[0055]
Further, the P2P domain server 30 includes a P2P domain name record 300. The P2P domain name record 300 is an accumulation of data that the P2P domain server 30 refers to for performing DNS resource name resolution, and is recorded in a storage device such as a hard disk in the P2P domain server 30.
[0056]
FIG. 4 is a diagram showing a P2P domain name record 300 in the P2P domain server 30 in the peer resource solution system 1 according to the first embodiment.
As shown in FIG. 4, the P2P domain name record 300 includes, in the P2P domain name column 301, the domain name of the P2P domain that is provided with the directory service from the P2P domain server 30, such as the responding P2P network 20. Record. Then, in association with the P2P domain name column 301, an address required to identify the P2P resource search unit 250 functioning as the P2P domain name server described above, that is, in the first embodiment, the response side communication is performed. The global IP address of the device 25 is recorded in the IP address column 302.
[0057]
In the peer resource solving system configured as described above, a process for solving a peer resource will be specifically described according to a procedure. Here, as an example, it is assumed that the inquiry-side peer 12 of the inquiry-side P2P network 10 uses a peer resource resolution process when establishing communication with the response-side peer 24 of the response-side P2P network 20. The domain name of the query side P2P network 10 is “xyz.p2p”, the domain name of the response side P2P network 20 is “abc.p2p”, and the peer name of the query side peer 12 is It is assumed that “HDVIDEO”, and the peer name of the responding peer 24 is “DVCamera”.
[0058]
FIG. 5 is a sequence diagram illustrating a processing procedure of the peer resource resolution in the peer resource resolution system 1 according to the first embodiment.
First, in the responding communication device 25 in the responding P2P network 20, the P2P resource registration unit 252 performs entry registration of the P2P resource search unit 250 as a P2P domain name server in the P2P domain server 30 at startup (S100). Specifically, this entry registration includes the domain name “abc.p2p” of the responding P2P network 20 and the address required to identify the P2P resource search unit 250, that is, the global IP address of the responding communication device 25. Is transmitted to the P2P domain server 30.
[0059]
When the P2P domain server 30 acquires a packet for entry registration of the P2P resource search unit 250 from the responding communication device 25, the P2P domain server 30 analyzes information included in the packet, and acquires the domain name “abc.p2p” of the responding P2P network 20. Is associated with the global IP address of the response-side communication device 25 and stored in the P2P domain name column 301 and the IP address column 302 of the P2P domain name record 300, and the P2P domain name record 300 is updated (S101).
[0060]
Here, when trying to establish communication with the responding peer 24 from the querying peer 12, the querying peer 12 firstly inputs the peer name "DVCamera" and the P2P domain name "abc.p2p" of the responding peer 24. It generates the specified peer inquiry request and transmits it to the inquiry communication device 15 via the inquiry P2P network 10 (S102).
[0061]
Next, upon acquiring the peer inquiry request from the inquiry side peer 12, the inquiry side communication device 15 performs a protocol conversion to the DNS resource inquiry request by the DNS resource inquiry unit 150 (S103). After that, when the inquiry-side communication device 15 transmits a DNS resource inquiry request to the domain server of the inquiry-side P2P network 10, the DNS server that manages the domain name “abc.p2p” is hierarchized on the wide area network 40. Searched in DNS servers. Then, as a result, the DNS resource inquiry request is transferred to the P2P domain server 30 (S104).
[0062]
Here, upon acquiring the DNS resource inquiry request, the P2P domain server 30 analyzes the information included in the inquiry DNS resource 115 of the DNS resource inquiry request, and stores the P2P of the P2P domain name record 300 held therein. The domain name string 301 is referred to (S105). At this time, since “abc.p2p” which is the domain name of the responding P2P network 20 exists in the P2P domain name column 301 in the inquiry DNS resource 115 of the DNS resource inquiry request, the P2P domain server 30 executes “abc.p2p”. The global IP address of the responding communication device 25 stored in the IP address column 302 associated with "" is read, and a DNS resource inquiry is forwarded to this address (S106).
[0063]
After that, when the response side communication device 25 acquires the DNS resource inquiry request forwarded from the P2P domain server 30, the P2P resource search unit 250 converts the protocol into the peer response request (S107). Then, the P2P resource search unit 250 broadcasts a peer response request to the responding peer groups 21 to 24 in the responding P2P network (S108).
[0064]
When each of the responding peer groups 21 to 24 obtains the peer response request transmitted from the P2P resource search unit 250, the P2P resource inquiry response unit 240 analyzes the information included in the destination peer name 104 of the peer response request. Then, it is determined whether or not it matches its own peer name (S109). At this time, since the destination peer name 104 of the peer response request includes “DVCamera” which is the peer name of the responding peer 24, the responding peer 24 transmits its own peer name by the P2P resource inquiry response unit 240. To the peer address, which resolves the peer resource.
[0065]
Thereafter, the responding peer 24 generates a peer response including information indicating its own peer address to return the result of the resolution of the peer resource to the querying peer 12 that is the source of the peer inquiry request. This is transmitted to the communication device 25 (S110).
[0066]
The responding communication device 25 obtains the peer response from the responding peer 24 by the P2P resource search unit 250, performs protocol conversion on the DNS resource inquiry response (S111), and transmits the DNS resource inquiry response to the P2P domain server 30. (S112).
[0067]
Upon acquiring the DNS resource inquiry response, the P2P domain server 30 refers to the destination IP address included in the TCP / IP header 111 of the DNS resource inquiry response to determine the global IP address of the inquiry-side communication device 15, and The response is forwarded to the inquiry-side communication device 15 (S113).
[0068]
When the inquiry-side communication device 15 receives the DNS resource inquiry response transmitted from the P2P domain server 30 via the wide area network 40, the DNS resource inquiry unit 150 converts the protocol into a peer inquiry response (S114). Then, the DNS resource inquiry unit 150 transmits a peer inquiry response to the inquiry side peer 12 that has made the inquiry about the peer resource, and returns a result of the resolution of the peer resource in the response side peer 24 (S115). This allows P2P communication between the inquiry-side peer 12 and the response-side peer 24. As a result, via the P2P communication, the inquiring peer 12 performs control such as directly obtaining the moving image file recorded by the responding peer 24 from the responding peer 24 and giving an operation instruction to the responding peer 24. can do.
[0069]
As described above, according to the first embodiment, by combining the static resource resolution by the directory service called DNS and the dynamic resource resolution by the P2P resource search unit, the peer name and the peer address are statically entered. Since the resources of the peers on the P2P network that have not been established can be solved, P2P communication can be realized at low cost without increasing the cost of adding an existing directory service.
[0070]
Further, by dynamically resolving resources on the P2P network, it is possible to ensure responsiveness to peer generation and disappearance.
In the first embodiment, when there is no peer to be a destination in the responding P2P network 20, that is, when any of the responding peers 21 to 24 in the responding P2P network is the destination of the peer response request. If the information included in the peer name 104 does not match its own peer name, the following processing procedure is performed.
[0071]
In this case, for example, if the information included in the destination peer name 104 of the peer response request does not match its own peer name by the P2P resource inquiry response unit 240, the responding peers 21 to 24 match. The response-side communication device 25 transmits a packet including information indicating that the packet has not been transmitted to the response-side communication device 25, and the response-side communication device 25 obtains the packet from all peers in the response-side P2P network 20 by the P2P resource search unit 250. In this case, a DNS resource non-response notifying that the peer resource could not be resolved is generated and transmitted to the P2P domain server 30.
[0072]
In addition, the responding communication device 25 includes a timer or the like in the P2P resource search unit 250, thereby measuring the elapse of a fixed time after transmitting the peer response request to the responding peers 21 to 24, and within this fixed time. If a peer response is not acquired, a DNS resource non-response may be generated and transmitted to the P2P domain server 30.
[0073]
(Embodiment 2)
Next, a peer resource solving system according to Embodiment 2 of the present invention will be described with reference to the drawings.
FIG. 6 is a functional block diagram of each component in the peer resource solving system 2 according to the second embodiment.
[0074]
Although the configuration of the peer resource resolution system 2 is substantially the same as the configuration of the peer resource resolution system 1 in the first embodiment, the presence of the predetermined firewall 26a in the responding P2P network 20a allows the P2P domain server 30a to Since the forwarded DNS resource inquiry request cannot directly access the response-side P2P network 20a, the resource inquiry relay server 50 is interposed between the response-side P2P network 20a and the P2P domain server 30a. Different from the form 1.
[0075]
Hereinafter, points different from the first embodiment will be mainly described. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted (hereinafter, the same applies to other drawings).
[0076]
As shown in FIG. 6, the responding P2P network 20a is composed of responding peers 21a to 24a, a responding communication device 25a, and a firewall 26a for preventing the responding P2P network 20a from being intruded from outside. .
[0077]
The firewall 26a is a processing device that monitors data flowing on a boundary between the responding P2P network 20a and another network, detects an unauthorized access to the responding communication device 25a, and cuts off the unauthorized access. The firewall 26a is realized by dedicated hardware, but may be realized by software mounted on the responding communication device 25a such as a broadband router. In the second embodiment, it is assumed that a DNS resource inquiry request forwarded from the P2P domain server 30a is blocked by the firewall 26a and cannot be passed.
[0078]
In the responding P2P network 20a, the responding communication device 25a includes a P2P resource searching unit 250a and a P2P resource registering unit 252a.
The P2P resource search unit 250a is substantially the same as the P2P resource search unit 250 in the first embodiment, but does not directly obtain the DNS resource inquiry request from the P2P domain server 30a but sends the DNS inquiry request to the resource inquiry relay server 50. This embodiment is different from the first embodiment in that a message for requesting storage information is transmitted and a DNS resource inquiry request is obtained from the resource relay server 50. Here, the message for requesting the storage information of the DNS resource inquiry request is information stored in a packet transmitted to the resource inquiry relay server 50, and stores the DNS resource inquiry request to the responding P2P network 20a. This is information for confirming whether or not it is stored, and requesting transmission to the responding communication device 25a if it is stored.
[0079]
The P2P resource registration unit 252a is a processing unit that registers, in the P2P domain server 30a, the resource inquiry relay server 50 that is a transfer destination of the DNS resource inquiry request to the response side P2P network 20a, and is mounted on the response side communication device 25a. It is realized by software or the like. The P2P resource registration unit 252a transmits information indicating the resource inquiry relay server 50 to the P2P domain server 30a when the responding communication device 25a is activated. Here, the information indicating the resource inquiry relay server 50 is a unique address or the like for the P2P domain server 30a to identify the resource inquiry relay server 50 to which the DNS resource inquiry request is transmitted, and the present embodiment 2 is the global IP address of the resource inquiry relay server 50.
[0080]
Further, the P2P domain server 30a includes a P2P domain name record 300a. The P2P domain name record 300a is a database recorded in a storage device such as a hard disk as in the first embodiment, but differs from the first embodiment in the recorded contents.
[0081]
FIG. 7 is a diagram showing a P2P domain name record 300a in the P2P domain server 30a in the peer resource solving system 2 according to the second embodiment.
[0082]
As shown in FIG. 7, the P2P domain name record 300a includes, in the P2P domain name column 301a, the domain name of the P2P domain that is provided with the directory service from the P2P domain server 30a, such as the responding P2P network 20a. Record. Then, in association with the P2P domain name column 301a, an address necessary to identify the resource inquiry relay server 50 to which the DNS resource inquiry is forwarded, that is, in the second embodiment, the address of the resource inquiry relay server 50 The global IP address is recorded in the IP address column 302a.
[0083]
Next, referring again to FIG. 6, looking at the data flow between the P2P domain server 30a and the responding P2P network 20a, the firewall 26a allows the P2P domain server 30a to freely access the responding P2P network 20a. Can not. Therefore, access from the P2P domain server 30a to the responding P2P network 20a is via the resource inquiry relay server 50.
[0084]
The resource inquiry relay server 50 is a server device interposed between the responding communication device 25a and the P2P domain server 30a, and includes an inquiry message holding unit 51 for temporarily storing a DNS resource inquiry request. The resource inquiry relay server 50 is realized by, for example, hardware such as a proxy server device or software such as a program stored in the server device.
[0085]
The inquiry message holding unit 51 is a storage device such as a hard disk that stores the DNS resource inquiry request acquired from the P2P domain server 30a.
[0086]
When the resource inquiry relay server 50 receives the message requesting the accumulated information of the DNS resource inquiry request from the P2P resource search unit 250a, the resource inquiry relay server 50 reads the DNS resource inquiry request from the inquiry message holding unit 51 holding the DNS resource inquiry request. , P2P resource search unit 250a.
[0087]
In the thus configured peer resource solving system according to the second embodiment, a process for solving a peer resource will be specifically described according to a procedure. Here, as an example, it is assumed that the querying peer 12 of the querying P2P network 10 uses a peer resource resolution process when establishing communication with the responding peer 24a of the responding P2P network 20a. The domain name of the query side P2P network 10 is “xyz.p2p”, the domain name of the response side P2P network 20a is “def.p2p”, and the peer name of the query side peer 12 is It is assumed that "HDVIDEO" and the peer name of the responding peer 24a is "DVCamera".
[0088]
FIG. 8 is a sequence diagram illustrating a processing procedure of the peer resource resolution in the peer resource resolution system 2 according to the second embodiment.
First, in the responding communication device 25a in the responding P2P network 20a, the P2P resource registration unit 252a registers the resource inquiry relay server 50 as a P2P domain name server in the P2P domain server 30a at the time of startup (S200). Specifically, this entry registration is performed by registering the domain name “def.p2p” of the responding P2P network 20a and an address necessary to identify the resource inquiry relay server 50, that is, the global address of the resource inquiry relay server 50. This is performed by transmitting a packet including information indicating the IP address to the P2P domain server 30a.
[0089]
When the P2P domain server 30a acquires a packet for registering the resource inquiry relay server 50 from the responding communication device 25a, the P2P domain server 30a analyzes the information included in the packet and determines the domain name “def.p2p” of the responding P2P network 20a. Is associated with the global IP address of the resource inquiry relay server 50 and stored in the P2P domain name column 301a and the resource inquiry relay server IP address column 302a of the P2P domain name record 300a, and the P2P domain name record 300a is updated. (S201).
[0090]
Here, when the communication from the inquiry-side peer 12 to the response-side peer 24a is to be established, the same processing as that of the first embodiment is performed in the inquiry-side network 10. Although not shown in the drawing, the inquiry-side peer 12 generates a peer inquiry request that specifies the peer name “DVcamera” and the P2P domain name “def.p2p” of the response-side peer 24a, and sends the request to the inquiry-side communication device 15. Then, the query communication device 15 performs protocol conversion of the peer query request into a DNS resource query request and transmits the request to the domain server of the query P2P network 10. Note that these processes correspond to the processes in S102 and S103 shown in FIG.
[0091]
When the P2P domain server 30a acquires the DNS resource inquiry request via the hierarchically arranged DNS server group on the wide area network 40 (S204), the information included in the DNS resource 115 inquiry DNS resource inquiry request is provided. Is analyzed, and the P2P domain name column 301a of the P2P domain name record 300a stored therein is referred to (S205). At this time, in the inquiry DNS resource 115 of the DNS resource inquiry request, the domain name “def.p2p” of the responding P2P network 20a exists in the P2P domain name column 301a, so the P2P domain server 30a sends “def.p2p”. The global IP address of the resource inquiry relay server 50 associated with "" is read, and a DNS resource inquiry request is forwarded to this address (S206).
[0092]
Upon acquiring the DNS resource inquiry request forwarded from the P2P domain server 30a, the resource inquiry relay server 50 stores the DNS resource inquiry request in the inquiry message holding unit 51 provided inside the server, and holds the DNS resource inquiry request (S207).
[0093]
Here, in the responding communication device 25a, when the P2P resource search unit 250a transmits a message confirming the presence or absence of the DNS resource inquiry request to the resource inquiry relay server 50 (S208), the resource inquiry relay server 50 makes the inquiry. With reference to the message holding unit 51, a DNS resource inquiry request is read and transmitted to the P2P resource search unit 250a (S209).
[0094]
Thereafter, in the responding communication device 25a, after the P2P resource searching unit 250a acquires the DNS resource inquiry request, the P2P resource searching unit 250a and the responding peers 21 to 24 perform the same processing as in the first embodiment, and The resource is resolved (S210). That is, when the P2P resource search unit 250a transmits a peer response request including the information “DVcamera” to the destination peer name 104 to the responding peer groups 21a to 24a, the responding peer 24a sends the P2P resource inquiry response unit 240a Generates a peer response in order to resolve the peer resource by performing name resolution from its peer name to the peer address, and to return the result of the resolution of the peer resource to the inquiring peer 12 that is the source of the peer inquiry request. I do.
[0095]
Then, the responding communication device 25a acquires the peer response generated by the responding peer 24a, converts the protocol into a DNS resource inquiry response by the P2P resource searching unit 250a, and transmits the protocol response to the P2P domain server 30a (S211). . Upon acquiring the DNS resource inquiry response, the P2P domain server 30a determines the global IP address of the inquiry communication device 15 and forwards the DNS resource inquiry response to the inquiry communication device 15 as in the first embodiment (S212). Finally, the inquiry-side communication device 15 returns the result of the resolution of the peer resource to the inquiry-side peer 12, so that P2P communication between the inquiry-side peer 12 and the response-side peer 24a becomes possible. .
[0096]
As described above, according to the second embodiment, by interposing the resource inquiry relay server between the P2P domain server and the responding P2P network, the firewall exists in the responding P2P network, Even when the communication with the side P2p network is restricted, the same effects as in the first embodiment can be obtained.
[0097]
As described above, the peer resource solving system according to the present invention has been described based on the embodiments, but the present invention is not limited to these embodiments.
[0098]
For example, in each of the above embodiments, the DNS resource inquiry unit in the inquiry side P2P network is realized by software implemented in the inquiry side communication device such as a broadband router, but is installed in a PC (Personal Computer). It may be realized by implemented software. Similarly, the P2P resource search unit and the P2P resource registration unit in the responding P2P network are realized by software installed in the responding communication device such as a broadband router, but are realized by software installed in the PC. May be performed.
[0099]
Further, in each of the above embodiments, the P2P resource search unit and the P2P resource registration unit are provided in the same device. However, the present invention is not limited to this. And a communication device such as a broadband router may include a P2P resource registration unit. Furthermore, the PC or the communication device may include a P2P resource registration and search unit in which the P2P resource search unit and the P2P resource registration unit are integrated.
[0100]
Further, in each of the above embodiments, the domain server that provides the directory service to the querying P2P network is different from the P2P domain server that provides the directory service to the responding P2P network. Similarly to the side P2P network, a directory service may be provided from a P2P domain server. In this case, it goes without saying that the DNS resource inquiry request is transmitted directly from the inquiry-side communication device to the P2P domain server without passing through the wide area network.
[0101]
Also, in the first embodiment, unlike the second embodiment, there is no firewall in the responding P2P network. However, this is not intended to exclude the firewall. For example, a DNS resource inquiry sent from a P2P domain server is not sent. There may be a firewall that uses packet filtering that specifies a port number that is allowed to pass requests.
[0102]
Further, in the second embodiment, the cache memory in the response-side P2P resource search unit is not described, but the response-side P2P resource search unit may include a cache memory as in the first embodiment.
[0103]
In each of the above embodiments, as a solution of the peer resource, it is exemplified that the peer address is derived from the peer name in order to establish the peer-to-peer communication. It may be used for resource resolution such as deriving capacity.
[0104]
【The invention's effect】
As described above, a peer resource solving system according to the present invention provides a resource indicating one attribute of a peer terminal in peer-to-peer communication between a first peer terminal in a first network and a second peer terminal in a second network. A peer resource resolution system for deriving resource resolution information indicating other attributes of said peer terminal from information, said peer resource resolution system being connected to said first network for deriving said resource resolution information for said resource information about said second peer terminal. A resource inquiry device that makes an inquiry, and a resource search device that is connected to the second network and searches for the second peer terminal based on the resource information about the second peer, and returns a search result to the resource inquiry device And the first network and the second network Is connected to a third network that mediates, and a domain server which provides a predetermined directory service to the second network.
[0105]
Here, as one embodiment of the present invention, the first peer terminal transmits an inquiry message indicating an inquiry about the resource information to the resource inquiry device according to a predetermined first protocol; Response message receiving means for receiving, from the resource inquiry device, a response message including the resource resolution information on the second peer terminal according to the first protocol, wherein the resource inquiry device is configured to execute the first Resource inquiry means for transmitting the inquiry message received from the peer terminal to the resource search device according to a second protocol for performing communication with the domain server; and a resource inquiry device transmitted from the resource search device according to the second protocol. The response message Receiving a di-, and a response message forwarding unit configured to transmit the response message to the first peer terminal in accordance with the first protocol.
[0106]
As another embodiment of the present invention, the resource search device receives an inquiry message indicating that the inquiry is about the resource information transmitted from the resource inquiry device according to the second protocol, and the inquiry message Resource search means for transmitting to the second peer terminal according to the first protocol, and a response message containing the resource resolution information on the second peer terminal received from the second peer terminal according to the first protocol, Resource response transmission means for transmitting to the resource inquiry device according to the two protocols, wherein the second peer terminal receives the inquiry message transmitted from the resource search device according to the first protocol. And the received inquiry message Resource resolution means for analyzing the resource information included in the message and deriving the resource resolution information, and response message transmission means for generating the response message including the resource resolution information and transmitting the response message to the resource search device according to the first protocol And
[0107]
Further, as still another embodiment of the present invention, a combination of the above two embodiments may be provided. Here, the domain server is configured to transmit the predetermined directory service from the resource inquiry device according to the second protocol. The transmitted inquiry message is transferred to the resource search device, and the response message transmitted from the resource search device is transferred to the resource inquiry device.
[0108]
As a result, the resources of the peer on the P2P network can be resolved without performing static entry registration of the peer, and P2P communication can be established without adding an existing directory service system.
[0109]
Further, it is possible to exhibit excellent followability with respect to generation and disappearance of a peer, and it is possible to shorten a time for responding to a peer inquiry.
Furthermore, since the existing directory service can be used, the system can be operated even without the network management technology of server management, and can be easily introduced to, for example, a home LAN. Can be.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall configuration of a peer resource solving system according to Embodiment 1 of the present invention.
FIG. 2 is a functional block diagram of each component in the peer resource solving system according to Embodiment 1 of the present invention.
FIG. 3 is a diagram schematically illustrating a protocol conversion process in the peer resource solving system according to the first embodiment of the present invention.
FIG. 4 is a diagram showing a P2P domain name record in a P2P domain server in the peer resource solving system according to the first embodiment of the present invention.
FIG. 5 is a sequence diagram showing a processing procedure of peer resource resolution in the peer resource resolution system according to Embodiment 1 of the present invention.
FIG. 6 is a functional block diagram of each component in a peer resource solving system according to Embodiment 2 of the present invention.
FIG. 7 is a diagram showing a P2P domain name record in a P2P domain server in the peer resource solving system according to Embodiment 2 of the present invention.
FIG. 8 is a sequence diagram showing a processing procedure of peer resource resolution in the peer resource resolution system according to Embodiment 2 of the present invention.
[Explanation of symbols]
10 Inquiry P2P network
11, 12, 13, 14 Querying peer
15 Inquiring communication device
20, 20a Responder P2P network
20b P2P network
21, 21a, 22, 22a, 23, 23a, 24, 24a Responding peer
25, 25a Responding communication device
26a firewall
30 P2P domain server
40 Wide area network
50 Resource inquiry relay server
51 Inquiry Message Holder
100 P2P network protocol
101 P2P header
102 P2P data
103 P2P message type
104 Destination peer name
105 Destination P2P domain name
106 Source peer address
107 Source peer name
110 TCP / IP protocol
111 TCP / IP header
112 TCP / IP data
113 DNS inquiry
114 DNS Message Header
115 Inquiry DNS resource
116 DNS Resource Response
120 P2P resource inquiry section
150 DNS resource inquiry section
240, 240a P2P resource inquiry response unit
250, 250a P2P resource search unit
251 cache memory
252, 252a P2P resource registration unit
300, 300a P2P domain name record
301, 301a P2P domain name string
302 IP address column
302a Resource relay server IP address column

Claims (17)

In peer-to-peer communication between a first peer terminal in a first network and a second peer terminal in a second network, resource resolution information indicating another attribute of the peer terminal is derived from resource information indicating one attribute of the peer terminal. A peer resource resolution system,
A resource inquiry device connected to the first network and inquiring to derive the resource solution information for the resource information on the second peer terminal;
A resource search device connected to the second network, searching for the second peer terminal based on the resource information about the second peer terminal, and returning a search result to the resource inquiry device;
A domain server that is connected to a third network that mediates between the first network and the second network and that provides a predetermined directory service to the second network;
The first peer terminal,
Inquiry message transmitting means for transmitting an inquiry message indicating that the inquiry is about the resource information to the resource inquiry device according to a predetermined first protocol;
Response message receiving means for receiving a response message including the resource resolution information regarding the second peer terminal from the resource inquiry device according to the first protocol,
The resource inquiry device,
Resource inquiry means for transmitting the inquiry message received from the first peer terminal according to the first protocol to the resource search device according to a second protocol for communicating with the domain server;
A response message forwarding unit that receives the response message transmitted from the resource search device according to the second protocol, and transmits the response message to the first peer terminal according to the first protocol. Resource resolution system. In peer-to-peer communication between a first peer terminal in a first network and a second peer terminal in a second network, resource resolution information indicating another attribute of the peer terminal is derived from resource information indicating one attribute of the peer terminal. A peer resource resolution system,
A resource inquiry device connected to the first network and inquiring to derive the resource solution information for the resource information on the second peer terminal;
A resource search device connected to the second network, searching for the second peer terminal based on the resource information about the second peer terminal, and returning a search result to the resource inquiry device;
A domain server that is connected to a third network that mediates between the first network and the second network and that provides a predetermined directory service to the second network;
The resource search device,
Receiving an inquiry message indicating that the inquiry is about the resource information transmitted from the resource inquiry device according to a second protocol for performing communication with the domain server; 2 resource search means for transmitting to the peer terminal;
Resource response transmission means for transmitting a response message including the resource resolution information on the second peer terminal received from the second peer terminal according to the first protocol to the resource inquiry device according to the second protocol,
The second peer terminal,
Inquiry message receiving means for receiving the inquiry message transmitted from the resource search device according to the first protocol;
Resource resolution means for analyzing the resource information included in the received inquiry message and deriving the resource resolution information,
Response message transmitting means for generating the response message including the resource resolution information and transmitting the response message to the resource search device according to the first protocol. In peer-to-peer communication between a first peer terminal in a first network and a second peer terminal in a second network, resource resolution information indicating another attribute of the peer terminal is derived from resource information indicating one attribute of the peer terminal. A peer resource resolution system,
A resource inquiry device connected to the first network and inquiring to derive the resource solution information for resource information on the second peer terminal;
A resource search device connected to the second network, searching for the second peer terminal based on the resource information about the second peer terminal, and returning a search result to the resource inquiry device;
A domain server that is connected to a third network that mediates between the first network and the second network and that provides a predetermined directory service to the second network;
The first peer terminal,
Inquiry message transmitting means for transmitting an inquiry message indicating that the inquiry is about the resource information to the resource inquiry device according to a predetermined first protocol;
Response message receiving means for receiving a response message including the resource resolution information regarding the second peer terminal from the resource inquiry device according to the first protocol,
The resource inquiry device,
Resource inquiry means for transmitting the inquiry message received from the first peer terminal according to the first protocol to the resource search device according to a second protocol for communicating with the domain server;
Response message forwarding means for receiving the response message transmitted from the resource search device according to the second protocol, and transmitting the response message to the first peer terminal according to the first protocol;
The resource search device,
Resource search means for receiving the inquiry message transmitted from the resource inquiry device according to the second protocol, and transmitting the inquiry message to the second peer terminal according to the first protocol;
Resource response transmission means for transmitting the response message received from the second peer terminal according to the first protocol to the resource inquiry device according to the second protocol,
The second peer terminal,
Inquiry message receiving means for receiving the inquiry message transmitted from the resource search device according to the first protocol;
Resource resolution means for analyzing the resource information included in the received inquiry message and deriving the resource resolution information,
Response message transmitting means for generating the response message including the resource resolution information, and transmitting the response message to the resource search device according to the first protocol,
The domain server,
The predetermined directory service transfers the inquiry message transmitted from the resource inquiry device to the resource search device according to the second protocol, and sends the response message transmitted from the resource search device to the resource inquiry device. A peer resource resolution system characterized by forwarding. The peer resource resolution system further comprises:
A resource registration device connected to the second network for registering the resource search means with the domain server;
The resource registration device,
A resource registration unit that registers information indicating the resource search unit in a record held by the domain server when the resource registration device is activated,
The domain server,
Transferring the inquiry message transmitted from the resource inquiry device to the resource search device according to the second protocol, based on the information indicating the resource search device registered in the record by the resource registration device. 4. The peer resource resolution system according to claim 2, wherein The resource search device further includes:
Cache means for temporarily holding the response message received from the second peer terminal according to the first protocol,
The resource search means,
Does the inquiry message transmitted from the resource inquiry device according to the second protocol include information indicating that the inquiry message is an inquiry about resource information of the same peer terminal as the second peer terminal held in the cache unit? Analyzing whether or not the information includes the information, outputs the response message to the resource response transmitting unit, and if not including the information, transmits the inquiry message to the second peer terminal according to the first protocol And
The resource response transmitting means,
The method according to any one of claims 2 to 4, wherein, when the response message is obtained from the resource search unit, the response message is transmitted to the resource inquiry device according to the second protocol. Peer resource resolution system. The peer resource resolution system further comprises:
A resource inquiry relay server connected to a third network between the domain server and the second network;
The domain server,
Transferring the inquiry message transmitted from the resource inquiry device to the resource inquiry relay server according to the second protocol,
The resource inquiry relay server,
6. The server according to claim 1, further comprising a proxy unit that temporarily holds the inquiry message received from the domain server and transmits the inquiry message to the resource search device according to a predetermined condition. A peer resource resolution system according to claim 1. The resource registration means,
Registering information indicating the proxy means in a record held by the domain server when starting the resource registration device,
The second domain server comprises:
Transferring the inquiry message transmitted from the resource inquiry device according to the second protocol to the resource inquiry relay server based on the information indicating the proxy unit registered in the record by the resource registration unit. 7. The peer resource resolution system according to claim 6, wherein: The peer resource resolution system comprises:
The peer resource solving system according to any one of claims 4 to 7, further comprising a resource registration and search device that integrates the resource search device and the resource registration device. A resource inquiry device connected to the first network and inquiring about resource information indicating one attribute of the peer terminal to derive resource resolution information indicating another attribute of the peer terminal; and A resource search device that searches for the peer terminal based on resource information and returns a search result to the resource inquiry device; and a third network that mediates between the first network and the second network, A domain server that provides a predetermined directory service to the second network, and a peer in peer-to-peer communication between a first peer terminal connected to the first network and a second peer terminal connected to the second network A resource inquiry device of a resource resolution system,
The first peer terminal,
Inquiry message transmitting means for transmitting an inquiry message indicating an inquiry about the resource information regarding the second peer terminal to the resource inquiry device according to a predetermined first protocol;
Response message receiving means for receiving a response message including the resource resolution information regarding the second peer terminal from the resource inquiry device according to the first protocol,
The resource inquiry device,
Resource inquiry means for transmitting the inquiry message received from the first peer terminal according to the first protocol to the resource search device according to a second protocol for communicating with the domain server;
Response message forwarding means for receiving the response message transmitted from the resource search device according to the second protocol, and transmitting the response message to the first peer terminal according to the first protocol;
The resource search device,
Resource search means for receiving the inquiry message transmitted from the resource inquiry device according to the second protocol, and transmitting the inquiry message to the second peer terminal according to the first protocol;
Resource response transmission means for transmitting the response message received from the second peer terminal according to the first protocol to the resource inquiry device according to the second protocol,
The second peer terminal,
Inquiry message receiving means for receiving the inquiry message transmitted from the resource search device according to the first protocol;
Resource resolution means for analyzing the resource information included in the received inquiry message and deriving the resource resolution information,
Response message transmitting means for generating the response message including the resource resolution information, and transmitting the response message to the resource search device according to the first protocol,
The domain server,
The predetermined directory service transfers the inquiry message transmitted from the resource inquiry device to the resource search device according to the second protocol, and sends the response message transmitted from the resource search device to the resource inquiry device. A resource inquiry device characterized by transferring. A resource inquiry device connected to the first network and inquiring about resource information indicating one attribute of the peer terminal to derive resource resolution information indicating another attribute of the peer terminal; and A resource search device that searches for the peer terminal based on resource information and returns a search result to the resource inquiry device; and a third network that mediates between the first network and the second network, A domain server that provides a predetermined directory service to the second network, and a peer in peer-to-peer communication between a first peer terminal connected to the first network and a second peer terminal connected to the second network A resource search device of a resource resolution system,
The first peer terminal,
Inquiry message transmitting means for transmitting an inquiry message indicating an inquiry about the resource information regarding the second peer terminal to the resource inquiry device according to a predetermined first protocol;
Response message receiving means for receiving a response message including the resource resolution information regarding the second peer terminal from the resource inquiry device according to the first protocol,
The resource inquiry device,
Resource inquiry means for transmitting the inquiry message received from the first peer terminal according to the first protocol to the resource search device according to a second protocol for communicating with the domain server;
Response message forwarding means for receiving the response message transmitted from the resource search device according to the second protocol, and transmitting the response message to the first peer terminal according to the first protocol;
The resource search device,
Resource search means for receiving the inquiry message transmitted from the resource inquiry device according to the second protocol, and transmitting the inquiry message to the second peer terminal according to the first protocol;
Resource response transmission means for transmitting the response message received from the second peer terminal according to the first protocol to the resource inquiry device according to the second protocol,
The second peer terminal,
Inquiry message receiving means for receiving the inquiry message transmitted from the resource search device according to the first protocol;
Resource resolution means for analyzing the resource information included in the received inquiry message and deriving the resource resolution information,
Response message transmitting means for generating the response message including the resource resolution information, and transmitting the response message to the resource search device according to the first protocol,
The domain server,
The predetermined directory service transfers the inquiry message transmitted from the resource inquiry device to the resource search device according to the second protocol, and sends the response message transmitted from the resource search device to the resource inquiry device. A resource search device for transferring. A resource inquiry device connected to the first network and inquiring about resource information indicating one attribute of the peer terminal to derive resource resolution information indicating another attribute of the peer terminal; and A resource search device that searches for the peer terminal based on resource information and returns a search result to the resource inquiry device; and a third network that mediates between the first network and the second network, A domain server that provides a predetermined directory service to the second network, wherein in peer-to-peer communication between a first peer terminal connected to the first network and a second peer terminal connected to the second network, Solving the resource of the peer terminal from the resource information of the peer terminal A peer resource solution in a peer resource resolution system to derive the distribution,
In the first peer terminal,
An inquiry message transmitting step of transmitting an inquiry message indicating the inquiry about the resource information to the resource inquiry device according to a predetermined first protocol;
Receiving a response message including the resource resolution information regarding the second peer terminal from the resource inquiry device according to the first protocol,
In the resource inquiry device,
A resource inquiry step of receiving the inquiry message transmitted from the first peer terminal according to the first protocol, and transmitting the inquiry message to the resource search device according to a second protocol for communicating with the domain server; When,
A response message forwarding step of receiving the response message transmitted from the resource search device according to the second protocol, and transmitting the response message to the first peer terminal according to the first protocol. Resource resolution. A resource inquiry device connected to the first network and inquiring about resource information indicating one attribute of the peer terminal to derive resource resolution information indicating another attribute of the peer terminal; and A resource search device that searches for the peer terminal based on resource information and returns a search result to the resource inquiry device; and a third network that mediates between the first network and the second network, A domain server that provides a predetermined directory service to the second network, wherein in peer-to-peer communication between a first peer terminal connected to the first network and a second peer terminal connected to the second network, Solving the resource of the peer terminal from the resource information of the peer terminal A peer resource solution in a peer resource resolution system to derive the distribution,
In the resource search device,
Receiving an inquiry message indicating that the inquiry is about the resource information transmitted from the resource inquiry device according to a second protocol for performing communication with the domain server, and transmitting the inquiry message according to a predetermined first protocol 2 a resource search step to send to the peer terminal;
Transmitting a response message including the resource resolution information on the second peer terminal received from the second peer terminal according to the first protocol to the resource inquiry device according to the second protocol,
In the second peer terminal,
An inquiry message receiving step of receiving the inquiry message transmitted from the resource search device according to the first protocol;
A resource resolution step of analyzing the resource information included in the received inquiry message to derive the resource resolution information,
Transmitting a response message including the resource resolution information and transmitting the response message to the resource search device according to the first protocol. A resource inquiry device connected to the first network and inquiring about resource information indicating one attribute of the peer terminal to derive resource resolution information indicating another attribute of the peer terminal; and A resource search device that searches for the peer terminal based on resource information and returns a search result to the resource inquiry device; and a third network that mediates between the first network and the second network, A domain server that provides a predetermined directory service to the second network, wherein in peer-to-peer communication between a first peer terminal connected to the first network and a second peer terminal connected to the second network, Solving the resource of the peer terminal from the resource information of the peer terminal A peer resource solution in a peer resource resolution system to derive the distribution,
In the first peer terminal,
An inquiry message transmitting step of transmitting an inquiry message indicating the inquiry about the resource information to the resource inquiry device according to a predetermined first protocol;
Receiving a response message including the resource resolution information regarding the second peer terminal from the resource inquiry device according to the first protocol,
In the resource search device,
A resource search step of receiving the inquiry message transmitted from the resource inquiry device according to the second protocol, and transmitting the inquiry message to the second peer terminal according to a predetermined first protocol;
Transmitting a response message received from the second peer terminal according to the first protocol to the resource inquiry device according to the second protocol,
In the second peer terminal,
An inquiry message receiving step of receiving the inquiry message transmitted from the resource search device according to the first protocol;
A resource resolution step of analyzing the resource information included in the received inquiry message to derive the resource resolution information,
Generating a response message including the resource resolution information, and transmitting the response message to the resource search device according to the first protocol,
In the domain server,
The predetermined directory service transfers the inquiry message transmitted from the resource inquiry device to the resource search device according to the second protocol, and transmits the response message transmitted from the resource search device to the resource inquiry device. A peer resource solving method characterized by transferring. Furthermore, a method of solving a peer resource in a system connected to the second network and including a resource registration device for registering the resource search device with the domain server,
In the resource registration device,
Including a resource registration step of registering information indicating the resource search device in a record held by the domain server when starting the resource registration device,
In the domain server,
Transferring the inquiry message transmitted from the resource inquiry device according to the second protocol to the resource search device based on the information indicating the resource search device registered in the record in the resource registration step. 14. The peer resource solving method according to claim 12, wherein A program for a resource inquiry device,
14. A program for causing a computer to execute a resource inquiry step and a response message forwarding step in the peer resource solving method according to claim 11 or 13. A program for a resource search device,
14. A program for causing a computer to execute a resource search step and a resource response transmission step in the peer resource solving method according to claim 12 or 13. A program for a resource registration device,
15. A program for causing a computer to execute a resource registration step in the peer resource solving method according to claim 14.

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