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标题: 一个很实用的服务端和客户端进行TCP通信的实例 [打印本页]
作者: admin 时间: 2020-5-9 01:46
标题: 一个很实用的服务端和客户端进行TCP通信的实例
本文给出一个很实用的服务端和客户端进行TCP通信的小例子。具体实现上非常简单,只是平时编写类似程序,具体步骤经常忘记,还要总是查,暂且将其记下来,方便以后参考。/ f3 Z, T4 t+ t' ^1 W
(1)客户端程序,编写一个文件client.c,内容如下:
6 C/ a- R# ~$ w- L9 n0 `6 q- #include <stdlib.h>
1 q+ {4 |2 y5 E# {/ C6 l5 F6 k1 ^) a - #include <stdio.h>6 Z3 |6 F2 \3 v% ~2 b8 d
- #include <unistd.h># r) s/ ]/ A6 }7 r5 c) X4 `! w
- #include <string.h>" M# Y# Z( m! [- C7 S
- #include <sys/types.h>
( T0 o5 t5 e: w' ], b( D - #include <sys/socket.h>
; x5 L+ Q# ~0 w+ S4 o# W8 l& K4 E - #include <netinet/in.h>
7 h$ M p. k0 Y9 q - #include <netdb.h> /* netdb is necessary for struct hostent */5 c+ Z* f+ {" @3 A
& E' U# O2 o: p) l% u- U) j- #define PORT 4321 /* server port */
- m* }) G: [- S - + @8 a1 N) b$ K6 ?
- #define MAXDATASIZE 100; ?5 u" i3 U/ x w0 Z
- k. k4 r: V$ R6 n* N
- int main(int argc, char *argv[])
: v% {$ z5 [ }: A0 @) f' b - {
) b& k/ d+ K3 c) r/ o' V: P8 p% F9 v( o - int sockfd, num; /* files descriptors */
# x4 ~/ D: R, Z) x& k - char buf[MAXDATASIZE]; /* buf will store received text */' g9 ~0 u! w; ]5 V* {
- struct hostent *he; /* structure that will get information about remote host */% I5 O4 Q; t8 y% J7 T
- struct sockaddr_in server;) T5 A( a2 s) P: m+ S* Q. x" f
-
* R! Z& _: u2 V& e% v - if (argc != 2)4 a% l& ?: Q! j/ I9 z) \
- {
( i9 v% E5 O6 B$ _. l) r5 Q' E - printf("Usage: %s <IP Address>\n",argv[0]);
7 S4 Z! _( [* _6 }1 U - exit(1);; {& t+ t$ g, p
- } R' J' B9 Y1 t% G' f2 _6 f
-
+ V7 ^/ A' t7 A% T - if((he=gethostbyname(argv[1]))==NULL)
4 ?! v5 Q% v! P: M - {; N# m( T& a; Y, y: I; p
- printf("gethostbyname() error\n");8 Z7 ]7 S! ^# J6 a k& e! s
- exit(1);$ Y6 O( y7 H! A9 E& h' G( i5 ]7 v
- }
4 g r; M. x2 F - / @. T `' y( h; h1 |
- if((sockfd=socket(AF_INET,SOCK_STREAM, 0))==-1)
* {, `9 \8 h1 D1 B* a4 @% ? - {8 R6 H5 l3 \: V3 \: G
- printf("socket() error\n");2 b9 ]! C9 t1 v, S; t
- exit(1);
7 a) v. C5 A! } - }" |) d# c# ^# h! e4 I# |0 z. A
- bzero(&server,sizeof(server));
& L3 J/ G- v( q3 P9 l - server.sin_family = AF_INET;
9 [! ?( o% P7 e X$ R$ `5 q6 X - server.sin_port = htons(PORT);
4 t. B4 x- t) i1 t. O$ M( S - server.sin_addr = *((struct in_addr *)he->h_addr);( t0 r8 E% W) B: C
- if(connect(sockfd, (struct sockaddr *)&server, sizeof(server))==-1)! s) A7 W0 l( v$ C: D% ~4 \1 O
- {% ^0 b: X7 b! W% \7 |7 H$ J
- printf("connect() error\n");7 B5 e- k m/ s5 Z& ?$ ]6 K
- exit(1);
0 r8 y, ^- h' K% K - }
7 u1 i4 v; C9 Q! G -
& N- q+ W% W3 y - char str[] = "horst\n"
+ |6 \) V% D5 h0 f- g* e* }0 p - * ^/ \2 }% G$ |9 R, `% r* h
- if((num=send(sockfd,str,sizeof(str),0))==-1){
; O9 F0 u9 X1 T0 a' H' X - printf("send() error\n");5 l7 [3 b# R1 c5 j8 t& L
- exit(1);
+ T! s) Y, V8 v H - }
6 {* m6 m2 x- L; U* N6 V& S - if((num=recv(sockfd,buf,MAXDATASIZE,0))==-1)5 r- p, N$ z, W5 F7 t0 w
- { ^1 q2 q* c+ }% }+ {
- printf("recv() error\n");
/ r% ?3 p& k3 V# F1 M# T - exit(1);5 i" ?3 ^4 ^, N! a! U
- }
5 Z6 d6 G( U2 y3 W- M) B( t - buf[num-1]='\0';
% S1 U, `* B" U& ]/ G9 X: h - printf("server message: %s\n",buf);
7 L& x9 ~ F# K7 p$ O - close(sockfd);+ g( p! D/ M9 M$ Q* X. E l( {
- return 0;
1 K1 b% `5 @% d* I3 C - }
复制代码 (2)服务器端,编写server.c,内容如下
l) [0 u3 W% I) \8 ~) a. X- #include <sys/time.h>, l' _# ^, l9 ]6 _1 `* O2 l; e
- #include <stdlib.h>
; v" B+ a- Y# Z6 A5 z+ J - #include <stdio.h>& y1 p! ~/ ^0 {( ^( i/ \
- #include <string.h># I7 K( Y3 N& l: Q+ d
- #include <unistd.h>8 ~0 J. `% j; |! g( v6 Z
- #include <sys/types.h>8 k2 n- `, C9 H
- #include <sys/socket.h>
. |3 J" r& F& s+ M5 u4 r7 x - #include <netinet/in.h>
7 D7 P# Q) v% ] - #include <arpa/inet.h>$ O6 B* ]6 f1 r4 e% B3 k( T i; U
- , t, E& \ q* V
- #define PORT 4321
1 t7 u) E8 R/ Y m - , ~- y9 g) [: S+ G0 ^; L
- #define BACKLOG 1
* u# K# j+ W9 g; S! d$ A* w - #define MAXRECVLEN 1024
& c! E4 X$ e/ D. S, g
& U+ e0 E- b, c3 c& l- int main(int argc, char *argv[])
" h9 u# X( R1 g - {8 ?& K& }0 ?3 `, c- ~3 ]# ^( ~
- char buf[MAXRECVLEN];1 q# J7 S' g. y, H
- int listenfd, connectfd; /* socket descriptors */
" G1 A7 R' }1 H0 N% a8 N - struct sockaddr_in server; /* server's address information */. N- P. h) Y$ L4 Q
- struct sockaddr_in client; /* client's address information */2 r2 Y s' G1 r/ o2 L- M
- socklen_t addrlen;9 t$ @2 }& D- I6 X5 p. q
- /* Create TCP socket */
" ? |3 B* |1 E$ v% D2 h8 B - if ((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)& C1 p" l& ~! v L7 b1 p2 F8 s
- {
. l" |5 V3 m, |# Y* e+ M1 L - /* handle exception */
* D, I' c% c$ z5 H: o7 \ - perror("socket() error. Failed to initiate a socket");( Z t/ G# Q' K2 u) R" \6 }
- exit(1);
& r; s$ B7 [0 P/ G. i/ K" | - }6 |* S, Z& o& G% Z- d% s
-
8 ^1 R" \- A# S! t& t - /* set socket option */! l5 l& F1 A1 r# c4 D2 P- A
- int opt = SO_REUSEADDR;, a4 q1 F& I8 ?% F. L2 U4 N' T
- setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
8 c; n6 T( V. Y
4 p7 L7 r$ l, M; j. {- S- bzero(&server, sizeof(server));& }; y* e% f3 n" J0 L( I+ E
- ( B7 `$ {9 V5 C
- server.sin_family = AF_INET;
6 P% A! W5 D9 t+ D" { - server.sin_port = htons(PORT);
! t2 y( w: b0 J* R6 B2 I) P - server.sin_addr.s_addr = htonl(INADDR_ANY); S; w q; p: ~# r
- if(bind(listenfd, (struct sockaddr *)&server, sizeof(server)) == -1)4 w9 o! a6 c+ x9 F: R8 d
- {
7 e6 P+ m* x+ p - /* handle exception */+ n# S; |7 G5 W/ ^1 b' v$ `: @
- perror("Bind() error.");9 Z# J1 |; G1 a5 b, T* {" m0 i2 E
- exit(1);! y* Z. ?, S y6 l+ [8 Z! k
- }0 y, @1 |) Q, q2 d
- ' ]+ G7 M# G' k3 A* d3 A4 ]
- if(listen(listenfd, BACKLOG) == -1). ]: Y/ G* o8 N: _% G6 o- g
- {5 t5 R/ n% \( U* Y4 R7 _% d
- perror("listen() error. \n");
! S' w# C: F9 m3 B" P: h - exit(1);
7 Y) s5 [0 N4 J# ` - }' h. c9 Q7 p' N* N2 T- d
- # ]5 [+ K4 [( C( C$ F& s0 S) J
- addrlen = sizeof(client);
- z6 K7 ^! p3 k7 e! j3 J, k - while(1){
% V0 E" Q+ K6 }% p E! r - if((connectfd=accept(listenfd,(struct sockaddr *)&client, &addrlen))==-1)
; e& |$ W- z: u$ m' b) J5 L# n - {" L$ `8 u+ Z# ~9 A
- perror("accept() error. \n");
0 ^9 }4 P" r' c" e - exit(1);9 X1 E& L" h" \ M0 _( h
- }
7 b# r6 d& ]; H: M; L7 m
" H9 L) ~3 I: c3 ^- F' F# t- struct timeval tv;2 Y: m4 o# @4 l; ]2 z+ w
- gettimeofday(&tv, NULL);$ i: C7 S9 Y3 q7 @" {" {& g7 Q
- printf("You got a connection from client's ip %s, port %d at time %ld.%ld\n",inet_ntoa(client.sin_addr),htons(client.sin_port), tv.tv_sec,tv.tv_usec);
9 ]4 A4 f7 ]1 t- }1 C2 V. @0 T - ! g V9 U6 X9 N5 i3 X5 M$ Q8 e4 B) z$ _
- int iret=-1;
% T5 w* |& o$ V+ o: @! U - while(1)
( e5 D8 C& O, P, r" K- D - {
4 ^3 w3 j; u/ Y+ ^6 I - iret = recv(connectfd, buf, MAXRECVLEN, 0);
2 V( n6 ?& } A- G% c' ~5 B; C# D - if(iret>0)
$ O; ~" w r7 D# u& l) z l0 u - {- [, v0 l7 q6 V4 M& l7 e: x
- printf("%s\n", buf);$ I) T) f* E ~% b7 ~
- }else
R# d5 j W! j. N - {
/ s6 [2 I# i$ ?2 [& v - close(connectfd);$ [: ?5 w/ S) n+ _ l4 M
- break;
2 J1 a! B! t0 G* [% N" O6 f; H - }
% A, O2 Y6 n* I9 ` s, k- R - /* print client's ip and port */
. x! g; S$ [- Q0 b - send(connectfd, buf, iret, 0); /* send to the client welcome message */5 T& O- t- s1 Y" N3 g3 u
- }4 M; A8 |- @- I! c) Z! j4 r
- }! ~% O# y6 P$ t* t- N
- close(listenfd); /* close listenfd */
: Y, p- n& l2 ]$ f; h; c - return 0;; X8 n6 z3 u/ T# N: H+ K8 V
- }
复制代码 # r) }: }% Y* Y0 y4 [' C F9 `
3 W( P7 P0 I1 O' @4 h/ [9 |: ~! h0 l
(3)编译运行
以上两个程序放在同一个目录下,比如 /home/horstxu/Cprog/tcpCSmodel
命令行进入该目录 $ cd /home/horstxu/Cprog/tcpCSmodel
命令行执行 $ gcc -o client client.c ,可以编译出客户端程序。
命令行执行 $ gcc -o server server.c,可以编译出服务端程序。
命令行执行 $ ./server,启动server程序。
这时你可能需要重新打开一个命令行窗口,到刚才的目录下,执行 $ ./client 127.0.0.1,启动客户端程序,就可以看到结果了。
客户端:
- $ ./client 127.0.0.1
# j- d' \" K% w - : r9 I1 Z, ~- O# K& K0 |
- server message:horst
复制代码
( ?3 {) ]5 o% k/ [% E3 r服务器端:
- $./server1 T4 d8 s3 q1 b, ^7 H
- you got a connection from client`s ip 127.0.0.1, port 60865 at time 1418281267.643428
复制代码本程序客户端会自动退出,服务器不会,因此如果想停掉服务器程序,直接在命令行界面按键盘Ctrl+C停止。
程序实现的功能很简单,就是服务器监听4321端口,客户端与之建立TCP连接后,再发送字符串“horst\n”到服务端,服务端打印出来,然后再把字符串传回给客户端,客户端再打印出来。然后客户端关闭连接退出,而服务端继续监听4321端口等待下一次连接。
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4 o0 t1 `6 d* @7 q5 M1 A: ~0 V& t( Q: | q1 u" J0 q! p) O
作者: admin 时间: 2020-5-9 01:48
服务端启动,客户端通过ip地址连接服务端,然后输入要发送的文件名,发送文件到服务段.
$ G3 n7 |$ d6 G( a. J2 F" l: k- /*client.c*/
5 e) k( b K' |9 n4 g - #include<netinet/in.h> // for sockaddr_in / _1 {# T+ R4 ` |, j% z
- #include<sys/types.h> // for socket
$ A- R# k x2 g. U# _7 t5 l - #include<sys/socket.h> // for socket & j9 ]4 h3 S% M0 _! u& H2 A
- #include<stdio.h> // for printf
. g/ N4 {; t- o3 S. u - #include<stdlib.h> // for exit ! j# w. h/ [+ W: c
- #include<string.h> // for bzero " F/ \2 A# P" ^0 N( H# N
* O2 ]0 G" |: P) }) Y- #define HELLO_WORLD_SERVER_PORT 6666 # Z/ u: J/ {! M( L- x: _
- #define BUFFER_SIZE 1024
1 [8 B! V& D1 v. V5 ]9 U, k - #define FILE_NAME_MAX_SIZE 512
2 A2 L ^3 {4 P7 N
9 q! c r0 p7 d% x1 i, \: I# Z- int main(int argc, char **argv) ' H/ N" k, e* t8 n# G7 d7 [
- {
/ E6 a4 M. H1 e3 O. I& } - if (argc != 2) 5 Z4 y1 ^' M* u
- {
3 O( }: o4 X" Z. z! t - printf("Usage: ./%s ServerIPAddress\n", argv[0]); & d/ `, K9 e# _1 p; W' Z( N
- exit(1);
2 E, k# ^3 ?4 G5 t6 ^: T4 J* K - } 2 \) }9 s7 |2 I! q' j1 J
0 X. @: D7 e0 G, o, `- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
: j; b) v& K0 Q1 n0 A' d - struct sockaddr_in client_addr; % [% ?. C# N( [2 g7 Q7 O" d) [8 t5 f
- bzero(&client_addr, sizeof(client_addr));
* u, m/ W2 \+ q! F u. P - client_addr.sin_family = AF_INET; // internet协议族
0 s- A! E& F* B$ s& E: b- g3 C - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址
4 F3 Y) G; N5 s! f3 E6 j- ^ - client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口 % r3 ]" T4 W2 a. C) l& e
" K" d" H8 ^. i( ^5 i+ G# S- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket ! \6 W. E3 m' a( q7 h' R
- int client_socket = socket(AF_INET, SOCK_STREAM, 0); - w- \4 \) S7 D# Q
- if (client_socket < 0)
& c# i8 R7 U9 [9 M7 l - { 9 d( |1 \8 H, d! r: ]
- printf("Create Socket Failed!\n");
; M3 P5 W I; V. z& A7 p) ]* A - exit(1); . _- D1 k+ `" Q) E# z
- } & X6 h& h% [9 A4 w( _8 B
" i# F1 B! N# q* U. V! B- // 把客户端的socket和客户端的socket地址结构绑定 T1 R7 Q n5 H5 c" |" Z
- if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr))) 7 w$ ^5 v/ }0 m4 `' v: ^
- {
) d+ G5 K* b! _* h9 Q, A - printf("Client Bind Port Failed!\n"); - J$ H' d. r3 R+ S
- exit(1);
2 K7 e# r7 s9 ] - }
2 n! A" p! j) s# \3 T+ g5 I
6 N* D7 ?! n, d, v7 G: i- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口 # G: l$ y7 d8 U
- struct sockaddr_in server_addr; % q$ c1 o" I" J' Q* o
- bzero(&server_addr, sizeof(server_addr)); ) W" {1 o: a3 |9 x
- server_addr.sin_family = AF_INET;
. X% {7 X+ L5 `
$ X$ ~% i: f* }- f6 \& k8 N- // 服务器的IP地址来自程序的参数
' J- Z" @% G5 _; k - if (inet_aton(argv[1], &server_addr.sin_addr) == 0)
. ]! }4 C' }" v X6 f3 h$ d - {
* t+ k/ U" ]3 [' J& {7 T$ ? - printf("Server IP Address Error!\n");
) g5 g5 F* Y, }- k! D4 v! H - exit(1); ; q3 w) j* v7 a$ f7 N8 d
- }
8 i! l4 c" ]; G% v$ c - 8 t% P% } U+ w; Q) M
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); 7 k4 N1 u4 c$ n) d* K, a. H# H) ^8 q+ O
- socklen_t server_addr_length = sizeof(server_addr); * `) H$ ]2 E- Q) V7 y* A
+ `) o& O1 n1 u" j4 ?& u- // 向服务器发起连接请求,连接成功后client_socket代表客户端和服务器端的一个socket连接
0 Y$ C3 V: w Y' f - if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0) ( t$ _* r4 P! T% y" O D+ p) v4 Q
- { " U! M O: S r1 {5 {
- printf("Can Not Connect To %s!\n", argv[1]);
! m* f. {$ q/ W: E+ E0 x - exit(1);
2 {3 A; @& t9 Q2 @ G - } " X; z* V% n) `3 f- ?2 Y, y
- 9 ?* P0 X# S9 l7 f
- char file_name[FILE_NAME_MAX_SIZE + 1]; , w* Z4 X: E0 k, c
- bzero(file_name, sizeof(file_name)); & I/ e4 S! h( C, _
- printf("Please Input File Name On Server.\t"); 9 J# V2 B$ K. b* m: R
- scanf("%s", file_name); ! p, s; y0 w4 ]
- * M% N& E+ U- a$ d" [& G, s
- char buffer[BUFFER_SIZE];
* g3 B# G- L) V# l0 Q+ ` - bzero(buffer, sizeof(buffer));
' _( `- U! l8 e- u - strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name)); 8 a: Z4 r) j& s( z2 Z
- // 向服务器发送buffer中的数据,此时buffer中存放的是客户端需要接收的文件的名字 ! B6 u0 j+ {6 O5 h& A) d
- send(client_socket, buffer, BUFFER_SIZE, 0); + B6 B9 E9 Y2 P% c% L. Z( j Y3 I+ r
- ! u4 W0 K: b2 d1 Y6 t5 u
- FILE *fp = fopen(file_name, "w"); " e2 q3 \4 v) Z4 i* Y
- if (fp == NULL) ) O/ K- X0 }0 [' H
- { 0 |8 ^! B6 F# q5 |$ M9 ?& r
- printf("File:\t%s Can Not Open To Write!\n", file_name); % P1 v2 J% W4 ~3 D' S! h' Z
- exit(1); & ^# ^4 ?/ M& n6 V* d
- } d# j/ C* n5 n7 p
, F, Q* Q+ [6 y3 X h+ p( h- // 从服务器端接收数据到buffer中
7 G$ z# ]; W; w, l - bzero(buffer, sizeof(buffer)); 8 D' x6 q& [2 E! s) r. f- P
- int length = 0;
9 N1 ^. q& M1 r3 r - while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))
2 v' E* s8 W5 \7 {5 I - {
3 r/ M0 K5 N, V% e% w0 W7 E" s - if (length < 0)
# f% A) _' t J0 q& _ - {
; I4 F! y$ Y( O2 E" c0 _/ n- C - printf("Recieve Data From Server %s Failed!\n", argv[1]); 5 N7 Q4 x/ n& ~' [" F& z6 |9 |
- break; 5 R2 l* \. n% z, G# p4 r& ]
- } / i7 U8 g; K; _7 ]) h3 @) [1 v
- 4 F3 q' G& v) q$ x9 J9 T6 \5 G' q
- int write_length = fwrite(buffer, sizeof(char), length, fp);
- {7 O! h( a5 p+ s6 y - if (write_length < length) * s2 s6 l, M! g% z! F7 |
- { ! L' S; _7 t3 l- Q5 a! Y, y6 f
- printf("File:\t%s Write Failed!\n", file_name);
6 u& a* N, v5 Y8 m5 O6 } - break; . ^- u% @1 g1 k5 i! A1 E
- }
, I# }! M' R, [# O7 F% E) r - bzero(buffer, BUFFER_SIZE); 4 o, ]% ^% C/ [5 @% h
- } / T2 w# [+ [( w. ^
- / D3 _0 p H: l' m, K X
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]);
1 M2 W6 Q* A9 c( M - " b1 Z* J$ ?$ I8 x: Q. @
- // 传输完毕,关闭socket
8 C% ^: ^1 D. m& C9 O( i - fclose(fp);
& N; ]7 @, s& p" _ - close(client_socket);
! t+ B2 l+ D# V2 h( v- U3 k - return 0; 8 i5 L+ E _ U" a
- 0 [6 U3 ^# K6 V& R3 L5 e
- } % Q9 V- q, {& {7 p' ~
- + ]# _; R1 h* S, ]( x5 g& Q2 ~+ ?, _
复制代码- /*server.c*/+ | m! w- j5 ^8 L
- #include<netinet/in.h>
0 X- [" I5 q2 a1 X8 y - #include<sys/types.h>3 O4 f* U( q3 N5 X3 u
- #include<sys/socket.h>0 j( H8 m' Q* I( P k8 v& z+ D
- #include<stdio.h>' A' ^: q8 g3 ?+ {) k6 u
- #include<stdlib.h>
3 r$ }8 t; [7 u, K$ `5 D - #include<string.h>. [; H& m7 M. H9 j4 v7 E& u
- % e; o& e7 V! w5 c: j5 y; b
- #define HELLO_WORLD_SERVER_PORT 6666 //端口号
! z% c, N5 `- ^ - #define LENGTH_OF_LISTEN_QUEUE 20
* o# @/ N0 i# x1 e - #define BUFFER_SIZE 1024% L: ?( P2 Q; K- z1 ?) W, e5 i
- #define FILE_NAME_MAX_SIZE 512
; U6 u( D+ W1 w2 h7 e) q7 }; G
2 N4 U' n3 n! O& j8 g- _ G- int main(int argc, char **argv), @9 Z! ~+ t# N# c5 j7 j0 q
- {/ X: O/ T+ E# k- O6 {/ U6 M3 _, d
- // set socket's address information5 I5 u% \: |* ^
- // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
$ D" V9 e# ^' v9 m K - struct sockaddr_in server_addr;
8 @4 {; ]) ^# {* L# }' X; J - bzero(&server_addr, sizeof(server_addr));
" r9 x- l) {3 b' R2 E - server_addr.sin_family = AF_INET;. K% U3 M& j4 d2 l" _+ H- @* m% b
- server_addr.sin_addr.s_addr = htons(INADDR_ANY);
% I; `1 P, \7 A k+ s2 O - server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);5 g e- S! M5 K+ x7 O9 a
- ; p4 {$ D. N( q2 f1 p
- // create a stream socket3 W, Q; n( @# Z8 G' h/ Y# P/ t
- // 创建用于internet的流协议(TCP)socket,用server_socket代表服务器向客户端提供服务的接口
' C6 g7 F+ K4 u/ T' k - int server_socket = socket(PF_INET, SOCK_STREAM, 0);
' N, ^- w1 ?" v. P& T/ c" p7 c - if (server_socket < 0)
) T( ~+ X W! J2 [& q - {
' U" ^5 q- X! K - printf("Create Socket Failed!\n");9 z2 H. d" A1 @2 G- q) R
- exit(1);
: l! Z; R/ m2 ?( _ - }
2 F0 I8 K+ u7 S. A6 h/ h6 c
& q3 l" @. b1 z) ]1 h' V- // 把socket和socket地址结构绑定: W6 L$ @/ S4 S7 k/ {7 x- |( G3 u
- if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
- j. f7 k: u% L$ H% y8 K9 t8 G4 L) f - {1 o& B6 u N- N& s- h3 p; X6 c
- printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);
0 E; \9 F7 n. D1 _9 \( u- R. ]+ E - exit(1);. {$ M6 s5 Z# M3 c" T& ^6 v
- }# |; O% d) ~ D b6 F5 U) e
* u" ~1 c2 M: m8 T: s- // server_socket用于监听7 P* E+ ] R$ \) z0 Y1 S6 e! Y \8 d! h
- if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE)): H& d' P! y$ q3 _" h. Q
- {4 a- h; f6 y- V+ k! P: d- |8 |/ Q
- printf("Server Listen Failed!\n");
+ D2 p- Y3 x$ b: T; ~ - exit(1);
- l9 r4 @, R6 `+ ^$ R* ?# ^6 G - }
- t; M) \6 a& {/ C$ B9 N5 ]0 e
9 w( `; K Z# B' e- // 服务器端一直运行用以持续为客户端提供服务
2 r/ c6 p( X8 H8 t4 ^* N6 p( N - while(1)5 q2 t2 s& J' Q7 C$ }# f
- {2 ?: A @. S& p; S1 o/ t
- // 定义客户端的socket地址结构client_addr,当收到来自客户端的请求后,调用accept8 n2 B& h# r) P( F
- // 接受此请求,同时将client端的地址和端口等信息写入client_addr中
9 Q" i2 m; e) q5 R; J$ ^, q* W% g - struct sockaddr_in client_addr;6 ~: o' A7 E3 [6 t9 M
- socklen_t length = sizeof(client_addr);# K! m5 |" G1 O/ g
- 5 Z; o( y6 }, E; O+ @$ l& u3 r
- // 接受一个从client端到达server端的连接请求,将客户端的信息保存在client_addr中
, m" S3 {( O. X6 a+ f - // 如果没有连接请求,则一直等待直到有连接请求为止,这是accept函数的特性,可以
2 H, u9 X7 E% [& L" C+ m: j - // 用select()来实现超时检测# a$ Y5 n ]3 r8 ^+ `- z
- // accpet返回一个新的socket,这个socket用来与此次连接到server的client进行通信
8 S8 Q, p) b H8 u5 u/ | - // 这里的new_server_socket代表了这个通信通道
0 V0 c" M" l. N" R - int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);" Z' i- h. d9 z( x' U# V
- if (new_server_socket < 0)
0 O2 H# m0 a: d; O - {
* O) X1 y, ^: A: [ - printf("Server Accept Failed!\n");; l& u% ~2 \, w) O( u0 Q& O
- break;
. W3 z* @- F) o$ o - }
: y8 V; u7 b) A
. a/ f8 |& l2 X0 s7 n L$ [- char buffer[BUFFER_SIZE];
3 G8 r! T& Q; [: c' W, |2 \, O q3 F - bzero(buffer, sizeof(buffer));
+ y, x9 e |8 Y3 y, a0 H' n - length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);; j# p, {* K- ]. M) [6 W' c+ e, C2 p
- if (length < 0)
/ |: x/ L& {& {% j - {
' h! X* I1 o6 j( {( t - printf("Server Recieve Data Failed!\n");
2 e+ K6 F$ |; @" _* ?4 e) C9 P - break;
! u% l- @3 D3 F& Q6 l8 `! ?) | - }
0 u. `& G0 {1 }0 o, ~ - $ {5 g2 m! W5 p0 L4 N- b2 V- `* X
- char file_name[FILE_NAME_MAX_SIZE + 1];9 n) [6 m. ~6 Y9 H4 r) x" x, S* A
- bzero(file_name, sizeof(file_name));
8 [; s7 O! L. ^* V - strncpy(file_name, buffer,
, k4 m. A: {3 P8 p0 Q- u% W - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));
% I4 v4 W2 ]" w3 m - $ Y+ g8 r' ~: g) b9 d' r: D
- FILE *fp = fopen(file_name, "r");6 E' v6 X/ {+ p& f/ w
- if (fp == NULL)9 s+ \& |. I2 S# @& A
- {
/ B/ p n: M9 V: r9 m. j6 q# k - printf("File:\t%s Not Found!\n", file_name);) y+ P" R% C1 s. c
- }9 r5 L [8 p) F9 W1 I' F- e
- else4 d! y6 o, L* n: W& ^, O7 B
- {% N, l, k9 j& c. b* U( e8 f
- bzero(buffer, BUFFER_SIZE);0 [4 O2 w, S# ]6 j W; M
- int file_block_length = 0;! l, @( y v. @; L! }) o8 t
- while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)5 o1 Z, ?( J% ^! o; h! A7 j
- {* u: u; m: ~- { I
- printf("file_block_length = %d\n", file_block_length);0 c# @) ^- Y' n) `
) C* Z5 E& Y3 q; t- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
" O# G; ?1 K1 J; y1 Q - if (send(new_server_socket, buffer, file_block_length, 0) < 0)& a8 O: O6 p6 ~7 g' M5 l1 N7 ?2 a" a& _
- {
d0 Q' }- ?; ]( G - printf("Send File:\t%s Failed!\n", file_name);
8 U( r0 i, J5 G2 I" U9 H - break;
" a+ J0 _/ f2 G8 U( n - }
: {, j: z6 X# A8 E+ Z7 [8 s - ! K' j* U1 i9 k9 c- z9 J& @3 f
- bzero(buffer, sizeof(buffer));9 y4 ?" F v9 R
- }
5 D K9 D) Z- c" S! |) S/ K* o - fclose(fp);3 D3 w! z" P, K, I2 b8 s9 q
- printf("File:\t%s Transfer Finished!\n", file_name);
: F6 y. i" }2 E {; c9 n - }
C5 [! a* V4 }1 M& Q( A/ _ - + [- C3 U- x1 Q& Q- s
- close(new_server_socket);! }$ X) Y7 q7 v% O5 b, e* k
- }
: O+ [! q! r, D - - O2 v* R0 i9 g- j. z/ ~9 O# k
- close(server_socket); u7 c& L& p3 Z: Z# C+ s
- 7 V1 a% A8 m7 _- A
- return 0;
$ O5 S& z9 \9 T6 p" L$ { - }6 T! Z* g: ]) ?8 A4 b
- v2 `1 y( g5 H7 Y$ i
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