Part 1．Introduction and TCP/IP 1
Chapter 1．Introduction 3
1.1 Introduction 3
1.2 A Simple Daytime Client 6
1.3 Protocol Independence 9
1.4 Error Handling:Wrapper Functions 11
1.5 A Simple Daytime Server 13
Contents 15
Preface 15
1.6 Road Map to Client-Server Examples in the Text 16
1.7 OSI Model 18
1.8 BSD Networking History 19
1.9 Test Networks and Hosts 20
1.10 Unix Standards 24
1.11 64-bit Architectures 27
1.12 Summary 28
Chapter2．The Transport Layer:TCP and UDP 29
2.1 Introduction 29
2.2 The Big Picture 30
2.3 UDP:User Datagram Protocol 32
2.4 TCP:Transmission Control Protocol 32
2.5 TCP Connection Establishment and Termination 34
2.6 TIME WAIT State 40
2.7 Port Numbers 41
2.8 TCP Port Numbers and Concurrent Servers 44
2 9 Buffer Sizes and Limitations 46
2.10 Standard Internet Services 50
2.11 Prctocol Usage by Common Internet Applications 52
2.12 Summary 52
Part 2．Elementary Sockets 55
Chapter 3．Sockets Introduction 57
3.1 Introduction 57
3.2 Socket Address Structures 57
3.3 Value-Result Arguments 63
3.4 Byte Ordering Functions 66
3.5 Byte Manipulation Functions 69
3.6 inet_aton,inet_addr,and inet_ntoa Functions 70
3.7 inet_poton and inet_ntop Functions 72
3.8 sock_ntop and Related Functions 75
3.9 readn,writen,and readline Functions 77
3.10 isfdtype Function 81
3.11 Summary 82
Chapter 4．Elementary TCP Sockets 85
4.1 Introduction 85
4.2 socket Function 85
4.3 connect Function 89
4.4 bind Function 91
4.5 listen Function 93
4.6 accept Function 99
4.7 fork and exec Functions 102
4.8 Concurrent Servers 104
4.9 close Function 107
4.10 getsockname and getpeername Functions 107
4.11 Summary 110
Chapter 5．TCP Client-Server Example 111
5.1 Introduction 111
5.2 TCP Echo Server:main Function 112
5.3 TCP Echo Server:str_echo Function 113
5.4 TCP Echo Client:main Function 113
5.5 TCP Echo Client:str_cli Function 115
5.6 Normal Startup 115
5.7 Normal Termination 117
5.8 Posix Signal Handling 119
5.9 Handling SIGCHLD Signals 122
5.10 wait and waitpid Functions 124
5.11 Connection Abort before accept Returns 129
5.12 Termination of Server Process 130
5.13 SIGPIPE Signal 132
5.14 Crashing of Server Host 133
5.15 Crashing and Rebooting of Server Host 134
5.16 Shutdown of Server Host 135
5.17 Summary of TCP Example 135
5.18 Data Format 137
5.19 Summary 140
6.1 Introduction 143
Chapter 6．I/O Multiplexing:The select and poll Functions 143
6.2 I/O Models 144
6.3 select Function 150
6.4 str_cli Function(Revisited) 155
6.5 Batch Input 157
6.6 shutdown Function 160
6.7 str_cli Function(Revisited Again) 161
6.8 TCP Echo Server(Revisited) 162
6.9 pselect Function 168
6.10 poll Function 169
6.11 TCP Echo Server(Revisited Again) 172
6.12 Summary 175
7.1 Introduction 177
Chapter 7．Socket Options 177
7.2 getsockopt and setsockopt Functions 178
7.3 Checking If an Option Is Supported and Obtaining the Default 178
7.4 Socket States 183
7.5 Generic Socket Options 183
7.6 IPv4 Socket Options 197
7.7 ICMPv6 Socket Option 199
7.8 IPv6 Socket Options 199
7.9 TCP Socket Options 201
7.10 fcntl Function 205
7.11 Summary 207
8.1 Introduction 211
Chapter 8．Elementary UDP Sockets 211
8.2 recvfrom and sendto Functions 212
8.3 UDP Echo Server:main Function 213
8.4 UDP Echo Senver:dg_echo Function 214
8.5 UDP Echo Client:main Function 216
8.6 UDP Echo Client:dg_c1i Function 217
8.7 Lost Datagrams 217
8.8 Verifying Received Response 218
8.9 Server Not Running 220
8.10 Summary of UDP example 221
8.11 connect Function with UDP 224
8.12 dg_cli Function(Revisited) 227
8.13 Lack of Flow Control with UDP 228
8.14 Determining Outgoing Interface with UDP 231
8.15 TCP and UDP Echo Server Using select 233
8.16 Summary 235
Chapter 9．Elementary Name and Address Conversions 237
9.1 Introduction 237
9.2 Domain Name System 237
9.3 gethostbyname Function 240
9.4 RES_USE_INET6 Resolver Option 245
9.5 gethostbyname2 Function and IPv6 Support 246
9.6 gethostbyaddr Function 248
9.7 uname Function 249
9.8 gethostname Function 250
9.9 getservbyname and getservbyport Functions 251
9.10 Other Networking Information 255
9.11 Summary 256
Part 3．Advanced Sockets 259
Chapter 10．IPv4 and IPv6 Interoperability 261
10.1 Introduction 261
10.2 IPv4 Client,IPv6 Server 262
10.3 IPv6 Client,IPv4 Server 265
10.4 IPv6 Address Testing Macros 267
10.5 IPV6_ADDRFORM Socket Option 268
10.6 Source Code Portability 270
10.7 Summary 271
11.2 getaddrinfo Function 273
Chapter 11．Advanced Name and Address Conversions 273
11.1 Introduction 273
11.3 gai_strerror Function 278
11.4 freeaddrinfo Function 279
11.5 getaddrinfo Function:IPv6 and Unix Domain 279
11.6 getaddrinfo Function:Examples 282
11.7 host_serv Function 284
11.8 tcp_connect Function 285
11.9 tcp_listen Function 288
11.10 udp_client Function 293
11.11 udp_connect Function 295
11.12 udp_server Function 296
11.13 getnameinfo Function 298
11.14 Reentrant Functions 300
11.15 gethostbyname_r and gethostbyaddr_r Functions 303
11.16 Implementation of getaddrinfo and getnameinfo Functions 305
11.17 Summary 328
Chapter 12．Daemon Processes and inetd Superserver 331
12.1 Introduction 331
12.2 syslogd Daemon 332
12.3 syslog Function 333
12.4 daemon_init Function 335
12.5 inetd Daemon 339
12.6 daemon_inetd Function 344
12.7 Summary 346
13.2 Socket Timeouts 349
Chapter 13．Advanced I/O Functions 349
13.1 Introduction 349
13.3 recv and send Functions 354
13.4 readv and writev Functions 357
13.5 recvmsg and sendmsg Functions 358
13.6 Ancillary Dafa 362
13.7 How Much Data Is Queued? 365
13.8 Sockets and Standard I/O 366
13.9 T/TCP:TCP for Transactions 369
13.10 Summary 371
Chapter 14．Unix Domain Protocols 373
14.1 Introduction 373
14.2 Unix Domain Socket Address Structure 374
14.3 socketpair Function 376
14.4 Socket Functions 377
14.5 Unix Domain Stream Clienf-Server 378
14.6 Unix Domain Datagram Client-Server 379
14.7 Passing Descriptors 381
14.8 Receiving Sender Credentials 390
14.9 Summary 394
Chapter 15．Nonblocking I/0 397
15.1 Introduction 397
15.2 Nonblocking Reads and Writes:str_cli Function(Revisited) 399
15.3 Nonblocking connect 409
15.4 Nonblocking connect:Daytime Client 410
15.5 Nonblocking connect:Web Client 413
15.6 Nonblocking accept 422
15.7 Summary 424
Chapter 16．ioctl Operations 425
16.1 Introduction 425
16.2 ioctl Function 426
16.3 Socket Operations 426
16.4 File Operations 427
16.5 Interface Configuration 428
16.6 get_ifi_info Function 429
16.7 Interface Operations 439
16.8 ARP Cache Operations 440
16.9 Routing Table Operations 442
16.10 Summary 443
Chapter 17．Routing Sockets 445
17.1 Introduction 445
17.2 Datalink Socket Address Structure 446
17.3 Reading and Writing 447
17.4 sysctl Operations 454
17.5 get_ifi_info Function 459
17.6 Interface Name and Index Functions 463
17.7 Summary 467
Chapter 18．Broadcasting 469
18.1 Introduction 469
18.2 Broadcast Addresses 470
18.3 Unicast versus Broadcast 472
18.4 dg_cli Function Using Broadcasting 475
18.5 Race Conditions 478
18.6 Summary 486
Chapter 19．Multlcasting 487
19.1 Introduction 487
19.2 Multicast Addresses 487
19.3 Multicasting versus Broadcasting on A LAN 490
19.4 Multicasting on a WAN 493
19.5 Multicast Socket Options 495
19.6 mcast_join and Related Functions 499
19.7 dg_cli Function Using Multicasting 502
19.8 Receiving MBone Session Announcements 504
19.9 Sending and Receiving 507
19.10 SNTP:Simple Network Time Protocol 510
19.11 SNTP(Continued) 515
19.12 Summary 528
Chapter 20．Advanced UDP Sockets 531
20.1 Introduction 531
20.2 Receiving Flags,Destination IP Address,and Interface Index 532
20.3 Datagram Truncation 539
20.4 When to Use UDP Instead Of TCP 539
20.5 Adding Reliability to a UDP Application 542
20.6 Binding Interface Addresses 553
20.7 Concurrent UDP Servers 557
20.8 IPv6 Packet Information 560
20.9 Summary 562
Chapter 21．Out-of-Band Data 565
21.1 Introduction 565
21.2 TCP Out-of-Band Data 565
21.3 sockatmark Function 572
21.4 TCP Out-of-Band Data Summary 580
21.5 Client-Server Heartbeat Functions 581
21.6 Summary 586
Chapter 22．Signal-Driven I/O 589
22.1 Introduction 589
22.2 Signal-Driven I/O for Sockets 590
22.3 UDP Echo Server Using SIGIO 592
22.4 Summary 598
23.1 Introduction 601
Chapter 23．Threads 601
23.2 Basic Thread Functions:Creation and Termination 602
23.3 str_cli Function Using Threads 605
23.4 TCP Echo Server Using Threads 607
23.5 Thread-Specific Data 611
23.6 Web Client and Simultaneous Connections(Continued) 620
23.7 Mutexes:Mutual Exclusion 622
23.8 Condition Variables 627
23.9 Web Client and Simultaneous Connections(Continued) 631
23.10 Summary 633
24.2 IPv4 Options 635
Chapter 24．IP Options 635
24.1 Introduction 635
24.3 IPv4 Source Route Options 637
24.4 IPv6 Extension Headers 645
24.5 IPv6 Hop-by-Hop Options and Destination Options 645
24.6 IPv6 Routing Header 649
24.7 IPv6 Sticky Options 653
24.8 Summary 654
Chapter 25．Raw Sockets 655
25.1 Introduction 655
25.2 Raw Socket Creation 656
25.3 Raw Socket Output 657
25.4 Raw Socket Input 659
25.5 Ping Program 661
25.6 Traceroute Program 672
25.7 An ICMP Message Daemon 685
25.8 Summary 702
Chapter 26．Datalink Access 703
26.1 Introduction 703
26.2 BPF:BSD Packet Filter 704
26.3 DLPI: Data Link Provider Interface 706
26.4 Linux:SOCK_PACKET 707
26.5 libpcap:Packet Capture Library 707
26 6 Examining the UDP Checksum Field 708
26.7 Summary 725
27.1 Introduction 727
Chapter 27．Ciient-Server Design Alternatives 727
27.2 TCP Client Altematives 730
27.3 TCP Test Client 730
27.4 TCP Iterative Server 732
27.5 TCP Concurrent Server,One Child per Client 732
27.6 TCP Preforked Server,No Locking around accept 736
27.7 TCP Preforked Server,File Locking around accept 742
27.8 TCP Preforked Server,Thread Locking around accept 745
27.9 TCP Preforked Server,Descriptor Passing 746
27.10 TCP Concurrent Server,One Thread per Client 752
27.11 TCP Prethreaded Server,per-Thread accept 754
27.12 TCP Prethreaded Server,Main Thread accept 756
27.13 Summary 759
Part 4．XTI:X/Open Transport Interface 761
Chapter 28．XTI:TCP Clients 763
28.1 Introduction 763
28.2 t_open Function 764
28.3 t_error and t_strerror Functions 767
28.4 netbuf Structures and XTI Structures 769
28.5 t_bind Function 770
28.6 t_connect Function 772
28.7 t_rcv and t_snd Functions 773
28.8 t_look Function 774
28.9 t_sndrel and t_rcvrel Functions 775
28.10 t_snddis and t_rcvdis Functions 777
28.11 XTI TCP Daytime Client 778
28.12 xti_rdwr Function 781
28.13 Summary 782
Chapter 29．XTl:Name and Address Functions 783
29.1 Introduction 783
29.2 /etc/netconfig File and netconfig Functions 784
29.3 NETPATH Variable and netpath Functions 785
29.4 netdir Functions 786
29.5 t_alloc and t_free Functions 788
29.6 t_getprotaddr Functions 790
29.7 xti_ntop Function 791
29.8 top_connect Function 792
29.9 Summary 796
30.1 Introduction 797
Chapter 30．XTI:TCP Servers 797
30.2 t_listen Function 799
30.3 tcp_listen Function 800
30.4 t_accept Function 802
30.5 xti_accept Function 803
30.6 Simple Daytime Server 804
30.7 Multiple Pending Connections 806
30.8 xti_accept Function(Revisited) 808
30.9 Summary 816
31.1 Introduction 819
31.2 t_rcvudata and t_sndudata Functions 819
Chapter 31．XTI:UDP Clients and Servers 819
31.3 udp_client Function 820
31.4 t_rcvuderr Function:Asynchronous Errors 824
31.5 udp_server Function 826
31.6 Reading a Datagram in Pieces 829
31.7 Summary 831
Chapter 32．XTI Options 833
32.1 Introduction 833
32.2 t_opthdr Structure 835
32.3 XTI Options 837
32.4 t_optmgmt Function 840
32.5 Checking If an Option Is Supported and Obtaining the Default 841
32.6 Getting and Setting XTI Options 844
32.7 Summary 848
Chapter 33．Streams 849
33.1 Introduction 849
33.2 Overview 850
33.3 getmsg and putmsg Functions 854
33.4 getpmsg and putpmsg Functions 855
33.5 ioctl Function 855
33.6 TPI:Transport Provider Interface 856
33.7 Summary 866
Chapter 34．XTI:Additional Functions 867
34.1 Introduction 867
34.2 Nonbiocking I/O 867
34.3 t_rcvconnect Function 868
34.4 t_getinfo Function 869
34.5 t_getstate Function 869
34.6 t_sync Function 870
34.7 t_unbind Function 872
34.8 t_rcvv and t_rcvvudata Functions 872
34.9 t_sndv and t_sndvudata Functions 873
34.10 t_rcvreldata and t_sndreldata Functions 874
34.11 Signal-Driven I/O 874
34.12 Out-of-Band Data 875
34.13 Loopback Transport Providers 880
34.14 Summary 881
A.2 IPv4 Header 883
A.1 Introduction 883
Appendix A．IPv4,IPv6,ICMPv4,and ICMPv6 883
A.3 IPv6 Header 885
A.4 IPv4 Addresses 887
A.5 IPv6 Addresses 892
A.6 ICMPv4 and ICMPv6:Internet Control Message Protocol 896
Appendix B．Virtual Networks 899
B.1 Introduction 899
B.2 The MBone 899
B.3 The 6bone 901
Appendix C．Debugging Techniques 903
C.1 System Call Tracing 903
C.3 sock Program 908
C.2 Standard Internet Services 908
C.4 Small Test Programs 911
C.5 tcpdump Program 913
C.6 netstat Program 914
C.7 lsof Program 914
Appendix D．Miscellaneous Source Code 915
D.1 unp.h Header 915
D.2 config.h Header 919
D.3 unpxti.h Header 920
D.4 Standard Error Functions 922
Appendix E．Solutions to Selected Exercises 925
Bibliography 963
Index 971