Part1. Introduction and TCP/IP
Chapter1. Introduction
1.1 Introduction 3
1.2 A Simple Daytime Client 6
1.3 Protocol Independence 10
1.4 Error Handling: Wrapper Functions 11
1.5 A Simple Daytime Server 13
1.6 Roadmap to Client/Server Examples in the Text 16
1.7 OSI Model !8
1.8 BSD Networking History 20
1.9 Test Networks and Hosts 22
1.10 Unix Standards 25
1.11 64-Bit Architectures 28
1.12 Summary 29
Chapter 2. The Transport Layer: TCP, UDP, and SCTP
2.1 Introduction 31
2.2 The Big Picture 32
2.3 User Datagram Protocol (UDP) 34
2.4 Transmission Control Protocol (TCP) 35
2.5 Stream Control Transmission Protocol (SCTP) 36
2.6 TCP Connection Establishment and Termination 37
2.7 TIME_WAIT State 43
2.8 SCTP Association Establishment and Termination 44
2.9 Port Numbers 50
2.10 TCP Port Numbers and Concurrent Servers 52
2.11 Buffer Sizes and Limitations 55
2.12 Standard Internet Services 61
2.13 Protocol Usage by Common Internet Applications 62
2.14 Summary 63
Part 2. Elementary Sockets
Chapter 3. Sockets Introduction
3.1 Introduction 67
3.2 Socket Address Structures 67
3.3 Value-Result Arguments 74
3.4 Byte Ordering Functions 77
3.5 Byte Manipulation Functions 80
3.6 inet_aton, inet_addr, and inet_ntoa Functions 82
3.7 inet_pton and inet_ntop Functions 83
3.8 sock_ntop and Related Functions 86
3.9 readn, writen, and readline Functions 88
3.10 Summary 92
Chapter 4. Elementary TCP Sockets
4.1 Introduction 9,5
4.2 socket Function 95
4.3 connect Function 99
4.4 bind Function 101
4.5 listen Function 104
4.6 accept Function 109
4.7 fork and exec Functions 111
4.8 Concurrent Servers 114
4.9 close Function 117
4.10 getsockname and getpeername Functions 117
4.11 Summary 120
Chapter 5, TCP Client/Server Example
5.1 Introduction 121
5.2 TCP Echo Server: main Function 122
5.3 TCP Echo Server: str echo Function 123
5.4 TCP Echo Client: main Function 124
5.5 TCP Echo Client: str cli Function 125
5.6 Normal Startup 126
5.7 Normal Termination 128
5.8 POSIX Signal Handling 129
5.9 Handling SIGCHLD Signals 132
5.10 wait and waitpid Functions 135
5.11 Connection,Abort before accept Returns 139
5.12 Termination of Server Process 141
5.13 SIGPIPE Signal 142
5.14 Crashing of Server Host 144
5.15 Crashing and Rebooting of Server Host 144
5.16 Shutdown of Server Host 145
5.17 Summary of TCP Example 146
5.18 Data Format 147
5.19 Summary 151
Chapter 6. I/O Multiplexing: The select and poll Functions
6.1 Introduction 153
6.2 I/O Models 154
6,3 select Function 160
6.4 str_cli Function (Revisited) 167
6.5 Batch Input and Buffering 169
6.6 shutdown Function 172
6.7 str eli Function (Revisited Again) 173
6.8 TCP Echo Server (Revisited) 175
6.9 pselect Function 181
6.10 poll Function 182
6.11 TCP Echo Server (Revisited Again) 185
6.12 Summary 188
Chapter 7. Socket Options
7.1 Introduction 191
7.2 getsockopt and setsockopt Functions 192
7.3 Checking if an Option Is Supported and Obtaining the Default
7.4 Socket States 198
7.5 Generic Socket Options 198
7.6 IPv4 Socket Options 214
7.7 ICMPv6 Socket Option 216
7.8 IPv6 Socket Options 216
7.9 TCP Socket Options 219
7.10 SCTP Socket Options 222
7.11 fcnt1 Function 233
7.12 Summary 236
Chapter 8. Elementary UDP Sockets
8.1 Introduction 239
8.2 recvfrom and sendto Functions 240
8.3 UDP Echo Server: main Function 241
8.4 UDP Echo Server: dg_echo Function 242
8.5 UDP Echo Client: main Function 244
8.6 UDP Echo Client: dg_cli Function 245
8.7 Lost Datagrams 245
8.8 Verifying Received Response 246
8.9 Server Not Running 248
8.10 Summary of UDP Example 250
8.11 connect Function with UDP 252
8.12 dg_cli Function (Revisited) 256
8,13 Lack of Flow Control with UDP 257
8.14 Determining Outgoing Interface with UDP 261
8.15 TCP and UDP Echo Server Using select 262
8.16 Summary 264
Chapter 9. Elementary SCTP Sockets
9.1 Introduction 267
9.2 Interface Models 268
9.3 sctp_bindx Function 272
9.4 sctp_connectx Function 274
9.5 sctp_getpaddrs Function 275
9.6 sctp_freepaddrs Function 275
9.7 sctp_get laddrs Function 275
9.8 sctp_freeladdrs Function 276
9.9 sctp_sendmsg Function 276
9.10 sctp_recvmsg Function 277
9.11 sctp_opt_info Function 278
9.12 sctp_peeloff Function 278
9.13 shutdown Function 278
9.14 Notifications 280
9.15 Summary 286
Chapter10. SCTP Client/Server Example
10.1 Introduction 287
10.2 SCTP One-to-Many-Style Streaming Echo Server: main Function
10.3 SCTP One-to-Many-Style Streaming Echo Client: main Function
10.4 SCTP Streaming Echo Client: str_cli Function 292
10.5 Exploring Head-of-Line Blocking 293
10.6 Controlling the Number of Streams 299
10.7 Controlling Termination 300
10.8 Summary 301
Chapter11. Name and Address Conversions
11.1 Introduction 303
11.2 Domain Name System (DNS) 303
11.3 gethostbyname Function 307
11.4 gethostbyaddr Function 310
11.5 getservbyname and getservbyport Functions 311
11.6 getaddrinfo Function 315
11.7 gai_strerror Function 320
11.8 freeaddrinfo Function 321
11.9 getaddrinfo Function: IPv6 322
11.10 getaddrinfo Function: Examples 324
11.11 host serv Function 325
11.12 tcp_connect Function 326
11.13 tcp_listen Function 330
11.14 udp_client Function 334
11.15 udp_connect Function 337
11.16 udp_server Function 338
11.17 getnameinfo Function 340
11.18 Re-entrant Functions 341
11.19 gethostbyname_r and gethostbyaddr_r Functions 344
11.20 Obsolete IPv6 Address Lookup Functions 346
11.21 Other Networking Information 348
11.22 Summary 349
Part 3. Advanced Sockets
Chapter12. IPv4 and IPv6 Interoperability
12.1 Introduction 353
12.2 IPv4 Client, IPv6 Server 354
12.3 IPv6 Client, IPv4 Server 357
12.4 IPv6 Address-Testing Macros 360
12.5 Source Code Portability 361
12.6 Summary 362
Chapter13. Daemon Processes and the inetd Superserver
13.1 Introduction 363
13.2 syslogd Daemon 364
13.3 syslo9 Function 365
13.4 daemon init Function 367
13.5 inetd Daemon 371
13.6 daemon inetd Function 377
13.7 Summary 379
Chapter14. Advanced I/O Functions
14.1 Introduction 381
14,2 Socket Timeouts 381
14.3 recv and send Functions 387
14.4 readv and writev Functions 389
14.5 recvmsg and sendmsg Functions 390
14,6 Ancillary Data 395
14.7 How Much Data Is Queued? 398
14.8 Sockets and Standard I/O 399
14.9 Advanced Polling 402
14.10 Summary 408
Chapter15. Unix Domain Protocols 411
15.1 Introduction 411
15.2 Unix Domain Socket Address Structure 412
15.3 socketpair Function 414
15.4 Socket Functions 415
15.5 Unix Domain Stream Client/Server 416
15.6 Unix Domain Datagram Client/Server 418
15.7 Passing Descriptors 420
15.8 Receiving Sender Credentials 429
15.9 Summary 432
Chapter16. Nonblocking I/O 435
16.1 Introduction 435
16.2 Nonblocking Reads and Writes: str cli Function (Revisited) 437
16.3 Nonblocking connect 448
16.4 Nonblocking connect: Daytime Client 449
16.5 Nonblocking connect: Web Client 452
16.6 Nonblocking accept 461
16.7 Summary 463
Chapter17. ioct1 Operations 465
17.1 Introduction 465
17.2 ioctl Function 466
17.3 Socket Operations 466
17.4 File Operations 468
17.5 Interface Configuration 468
17.6 get ifi info Function 469
17.7 Interface Dperations 480
17.8 ARP Cache Operations 481
17.9 Routing Table Operations 483
17.10 Summary 484
Chapter18. Routing Sockets 485
18.1 Introduction 485
18.2 Datalink Socket Address Structure 486
18.3 Reading and Writing 487
18.4 sysctl Operations 495
18.5 get_ifi_info Function (Revisited) 500
18.6 Interface Name and Index Functions 504
18.7 Summary 508
Chapter19. Key Management Sockets511
19.1 Introduction 511
19.2 Reading and Writing 512
19.3 Dumping the Security Association Database (SADB) 514
19.4 Creating a Static Security Association (SA) 517
19.5 Dynamically Maintaining SAs 524
19.6 Summary 528
Chapter 20. Broadcasting 529
20.1 Introduction 529
20.2 Broadcast Addresses 531
20.3 Unicast versus Broadcast 532
20.4 dg_cli Function Using Broadcasting 535
20.5 Race Conditions 538
20.6 Summary 547
Chapter 21. Multicasting 549
21.1 Introduction 549
21.2 Multicast Addresses 549
21.3 Multicasting versus Broadcasting on a LAN 553
21.4 Multicasting on a WAN 556
21.5 Source-Specific Multicast 558
21.6 Multicast Socket Options 559
21.7 mcast_join and Related Functions 565
21.8 dg_cli Function Using Multicasting 570
21.9 Receiving IP Multicast Infrastructure Session Announcements 571
21.10 Sending and Receiving 575
21.11 Simple Network Time Protocol (SNTP) 579
21.12 Summary 584
Chapter 22. Advanced UDP Sockets 587
22.1 Introduction 587
22.2 Receiving Flags, Destination IP Address, and Interface Index 588
22.3 Datagram Truncation 594
22.4 When to Use UDP Instead of TCP 594
22.5 Adding Reliability to a UDP Application 597
22.6 Binding Interface Addresses 608
22.7 Concurrent UDP Servers 612
22.8 IPv6 Packet Information 615
22.9 IPv6 Path MTU Control 618
22.10 Summary 620
Chapter 23. Advanced SCTP Sockets 621
23.1 Introduction 621
23.2 An Autoclosing One-to-Many-Style Server 621
23.3 Partial Delivery 622
23.4 Notifications 625
23.5 Unordered Data 629
23.6 Binding a Subset of Addresses 630
23.7 Determining Peer and Local Address Information 631
23.8 Finding an Association ID Given an IP Address 635
23.9 Heartbeating and Address Failure 636
23.10 Peeling Off an Association 637
23.11 Controlling Timing 639
23.12 When to Use SCTP Instead of TCP 641
23.13 Summary 643
Chapter 24. Out-of-Band Data 645
24.1 Introduction 645
24.2 TCP Out-of-Band Data 645
24.3 sockatmark Function 654
24.4 TCP Out-of-Band Data Recap 661
24.5 Summary 662
Chapter 25. Signal-Driven I/O663
25.1 introduction 663
25.2 Signal-Driven I/O for Sockets 664
25.3 UDP Echo Server Using SIGIO 666
25.4 Summary 672
Chapter 26. Threads 675
26.1 Introduction 675
26.2 Basic Thread Functions: Creation and Termination 676
26.3 str cli Function Using Threads 679
26.4 TcP-Echo Server Using Threads 681
26.5 Thread-Specific Data 686
26.6 Web Client and Simultaneous Connections (Continued) 694
26.7 Mutexes: Mutual Exclusion 697
26.8 Condition Variables 701
26.9 Web Client and Simultaneous Connections (Continued) 705
26.10 Summary 707
Chapter 27. IP Options 709
27.1 Introduction 709
27.2 IPv4 Options 709
27.3 IPv4 Source Route Options 711
27.4 I Pv6 Extension Headers 719
27.5 IPv6 Hop-by-Hop Options and Destination Options 719
27.6 IPv6 Routing Header 725
27.7 IPv6 Sticky Options 731
27.8 Historical IPv6 Advanced API 732
27.9 Summary 733
Chapter 28. Raw Sockets 735
28.1 introduction 735
28.2 Raw Socket Creation 736
28.3 Raw Socket Output 737
28.4 Raw Socket Input 739
28.5 ping Program 741
28.6 traceroute Program 755
28.7 An ICMP Message Daemon 769
28.8 Summary 786
Chapter 29. Datalink Access 787
29.1 Introduction 787
29.2 BSD Packet Filter (BPF) 788
29.3 Datalink Provider Interface (DLPI) 790
29.4 Linux: SOCK' PACKET and PF PACKET 791
29.5 libpcap: Packet Capture Library 792
29.6 libnet: Packet Creation and Injection Library 793
29.7 Examining the UDP Checksum Field 793
29.8 Summary 815
Chapter 30. Client/Server Design Alternatives 817
30.1 Introduction 817
30.2 TCP Client Alternatives 819
30.3 TCP Test Client 820
30.4 TCP Iterative Server 821
30.5 TCP Concurrent Server, One Child per Client 822
30.6 TCP Preforked Server, No Locking Around accept 826
30.7 TCP Preforked Server, File Locking Around accept 832
30.8 TCP Preforked Server, Thread Locking Around accept 835
30.9 TCP Preforked Server, Descriptor Passing 836
30.10 TCP Concurrent Server, One Thread per Client 842
30.11 TCP Prethreaded Server, per-Thread accept 844
30.12 TCP Prethreaded Server, Main Thread accept 846
30.13 Summary 849
Chapter 31. STREAMS 851
31.1 Introduction 851
31.2 Overview 851
31.3 getmsg and putmsg Functions 856
31.4 getpmsg and putpmsg Functions 857
31.5 ioctl Function 857
31.6 Transport Provider Interface (TPI) 858
31.7 Summary 868
Appendix A. IPv4, IPv6, ICMPv4, and ICMPv6 869
A.1 Introduction 869
A.2 IPv4 Header 869
A.3 IPv6 Header 871
A.4 IPv4 Addresses 874
A.5 IPv6 Addresses 877
A.6 Internet Control Message Protocols (ICMPv4 and ICMPv6) 882
Appendix B. Virtual Networks 885
B.1 Introduction 885
B.2 The MBone 885
B.3 The 6bone 887
B.4 IPv6 Transition: 6to4 889
Appendix C. Debugging Techniques 891
C.1 System Call Tracing 891
C.2 Standard Internet Services 893
0.3 sock Program 893
C.4 Small Test Programs 896
C.5 tcpdump Program 896
C.6 netstat Program 896
C.7 lsof Program 897
Appendix D. Miscellaneous Source Code 899
D.1 unp.h Header 899
D.2 config, h Header 904
D.3 Standard Error Functions 910
Appendix E. Solutions to Selected Exercises 913
Bibliography 947
Index 955
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