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lec6_server - Socket Network Programming The Server Marco...

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1 Socket Network Programming: The Server Marco Gruteser Network-Centric Programming
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2 Sockets API General interface for network programming and inter- process communication A socket is a communication endpoint, a tap into the network Network protocol independent but usually used with Internet protocols Allows variety of addressing formats Datagram Unordered message-oriented communication Application multiplexing Usually mapped to UDP Stream Application multiplexing Reliable, flow controlled data stream Usually mapped to TCP Raw Direct access to network layer Usually mapped to IP
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3 Creating a socket Int socket(int family, int type, int protocol) Returns socket file descriptor Family: AF_INET, AF_INET6, … Type: SOCK_STREAM, SOCK_DGRAM, SOCK_SEQPACKET, SOCK_RAW Protocol: 0 (select default), IPPROTO_TCP, IPPROTO_UDP, IPPROTO_SCTP Not all combinations valid
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4 Typical Socket Implementation of  Client-Server Scenario Socket() Connect() Write() Read() Close() TCP Client Socket() Accept() Read() Close() Write() Bind() Listen() TCP Server Connection Establishment Request Reply
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5 Which IP address?
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6 Internet Assigned Numbers Authority (IANA)  Maintains Port Numbers Common applications E.g.
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