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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。2 ^/ j1 B( V' k9 X5 m* Y
(1)客户端程序,编写一个文件client.c,内容如下:. i1 g3 Z! b2 c! J" ^' [8 S0 U
- #include <stdlib.h>
! `! K; E% U+ _) V - #include <stdio.h>
- T; q7 [* k& K' J4 x4 W' H - #include <unistd.h>, M4 \ `) t9 p: G7 U% c
- #include <string.h># |# z% I( ]0 P2 Z/ s0 @
- #include <sys/types.h>9 _! j" U V, Y
- #include <sys/socket.h>% ]0 |. e% n" G1 X- S
- #include <netinet/in.h>
3 P# }! z. v; o - #include <netdb.h> /* netdb is necessary for struct hostent */; o; ?# k* A* S2 w# R# N% h
# W8 p# A+ |$ v' h7 E2 ^! ]- #define PORT 4321 /* server port */& d% C2 p; l# W: b( ?9 j
2 R! e$ P" _. b4 d: ?- #define MAXDATASIZE 1003 i; A" l& R* v; v
- 9 o7 q* u$ }: `, Z k5 ~: p
- int main(int argc, char *argv[])
5 @, j# g+ M3 v. D; h - {
5 T6 ]" C$ ~3 Q8 q2 s9 X - int sockfd, num; /* files descriptors */! P8 h& J3 H d! N: t- V1 Z" V
- char buf[MAXDATASIZE]; /* buf will store received text */+ Q+ {& r9 ?& Q5 Z# {
- struct hostent *he; /* structure that will get information about remote host */
/ F. d8 ?/ {( ?8 b5 s - struct sockaddr_in server;* H$ @2 Q; s( d) P9 \6 h
-
' |1 a; `7 t+ M7 A - if (argc != 2)' h% q/ ^% V! d. `
- {
$ K6 k1 c2 Q- N; Q8 s W+ N" v3 c - printf("Usage: %s <IP Address>\n",argv[0]);
7 Y6 ]" |% F7 C& n - exit(1);$ s, ]% v; J1 n' O+ f; v
- }
0 i. I1 J2 s5 y2 {) J( z5 r - * @, M& Z8 x: ~, a$ c
- if((he=gethostbyname(argv[1]))==NULL)
3 B) {" }! ]4 M8 `" F - {5 ~4 Q6 q' |0 X) s' m. N, k
- printf("gethostbyname() error\n");
4 |: Z: o0 ]; T2 i% `& ?* @ - exit(1);
+ k, [# b# x4 L" Z - }
) s! J/ r7 \9 Z- K7 g* ~3 F0 h9 F. z -
5 q7 [+ [' U2 g \+ ?4 g, u - if((sockfd=socket(AF_INET,SOCK_STREAM, 0))==-1)
; H4 b/ e+ h7 { c - {" _' B# O) I/ j0 O
- printf("socket() error\n");
* Q4 j% u* n9 F# h, Y1 m" K - exit(1);- \- w8 w: _% |
- }
/ M5 I% ^6 j4 I1 Y - bzero(&server,sizeof(server));3 o) t) y+ U! q. B$ {" L; n) x
- server.sin_family = AF_INET;$ H* m% e! ?! C5 y( H9 }: Q/ ~% ]
- server.sin_port = htons(PORT);
$ U5 P; N& v# p9 h: f - server.sin_addr = *((struct in_addr *)he->h_addr);
5 D. m, [+ M& } - if(connect(sockfd, (struct sockaddr *)&server, sizeof(server))==-1); Q( f# ~: Z7 f1 B2 ?! Q( x- _+ k1 u
- {
, u: B& l+ l/ o - printf("connect() error\n");
. H9 B: E( N3 f$ T4 Y - exit(1);
! D/ X. ~& C! m9 r7 D& e4 s - }7 R7 _7 a3 F0 d# J% ?
- * `; v- P8 i* l5 j3 a
- char str[] = "horst\n"
+ `5 o; ^3 y8 H6 t! _( Q! n; T6 M) B - 2 R7 j; T- @! O4 q% a) S
- if((num=send(sockfd,str,sizeof(str),0))==-1){
( Z$ w- g1 N2 s2 u# U$ x0 ?. A - printf("send() error\n");* K6 n: [, p0 Y# C; J9 @, R2 _" a0 j
- exit(1);
- q/ H& I+ ]2 O j, \ - }
& D1 l% p! W4 r) T4 F/ l P - if((num=recv(sockfd,buf,MAXDATASIZE,0))==-1)3 K5 U; c/ z2 k0 k& d; b0 H
- {( M0 A! e) u0 @4 U- T
- printf("recv() error\n");5 Q7 Q! V9 a5 x4 E1 K
- exit(1);! k9 w; {& }8 c8 j
- }
$ x$ B6 \. x) L6 ` - buf[num-1]='\0';
- o) v; H3 F+ ^4 B/ S9 t" Q: o' a# m - printf("server message: %s\n",buf);
% X3 N4 @8 C7 O+ X' A8 N - close(sockfd);
# `* @: M2 V) w3 W( K - return 0;$ {' |6 k& |! l7 S' ~, p* q$ I
- }
复制代码 (2)服务器端,编写server.c,内容如下& K9 }0 l8 l; M$ M! j
- #include <sys/time.h>
# t& z! S% c8 O: A# @ - #include <stdlib.h>% H# R) f$ p1 ]6 p4 u8 r
- #include <stdio.h>
6 r- Y' o; ~5 }9 V8 B - #include <string.h>
6 _! F; S3 v4 R - #include <unistd.h>
5 G3 }, o, {" W3 [! q- E& n - #include <sys/types.h># b% H) F) E9 d6 S0 s9 B
- #include <sys/socket.h>
* d4 X% v1 Y$ ~" ^8 w - #include <netinet/in.h>. }4 O+ h3 `+ {
- #include <arpa/inet.h># I1 r& |9 p8 T2 d9 C- y) T" N
- % Q. X5 L* _$ F4 P& p
- #define PORT 4321
1 s% J/ s3 R7 @0 z: b# ~
1 g* h- x0 u# ]% `: G$ g- #define BACKLOG 1
" i O: ?4 S* T$ c! b - #define MAXRECVLEN 1024
6 m6 C' s" i5 } - # g3 r$ \' I7 j: k l5 @
- int main(int argc, char *argv[])5 a6 U* T% M) `) M$ b+ A
- {
/ m% j( K# e% r. y* | - char buf[MAXRECVLEN];, P1 L: F2 x' r# v% i3 I- I7 |' e6 w
- int listenfd, connectfd; /* socket descriptors */
3 F4 i8 u3 X) Y5 T - struct sockaddr_in server; /* server's address information */
& q9 R* [: F+ d( O' B( b' W - struct sockaddr_in client; /* client's address information */6 }6 m; C9 O6 T( t& o* q
- socklen_t addrlen;
, e$ S1 [. B! Q4 ]% G1 O* k$ v - /* Create TCP socket */
6 z$ p5 l' ^9 z' D2 B8 c' o - if ((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)# u1 I8 c" q( d ^; c: Z; l) |7 x
- {1 Z) k. B' t) q# _2 ]9 H& r
- /* handle exception */
$ \* _8 C8 L+ w - perror("socket() error. Failed to initiate a socket");5 R d- o- S6 Z* i) |4 ?8 K3 I g
- exit(1);$ K% m. g: t6 U, s9 m R
- }; r+ U5 l4 ?6 ~5 q
-
* d* L b, b' c, s) O" n" u( H - /* set socket option */4 {6 J( s; {0 M; v# V
- int opt = SO_REUSEADDR;4 l' M% k. c1 X; R z- X
- setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));$ D4 `5 _+ b; c. G. r' X
- 1 u) C' c0 i8 I8 N7 K- Z Y
- bzero(&server, sizeof(server));
3 C1 v4 X# U2 q0 w& ^
$ K0 W) s2 h) U C' T- server.sin_family = AF_INET;
, g' b+ f( C7 l( m9 [ - server.sin_port = htons(PORT);' l& ~; x$ D7 g( l1 I5 a; F1 V" W
- server.sin_addr.s_addr = htonl(INADDR_ANY);
; Q0 x( C6 u5 P+ q9 j - if(bind(listenfd, (struct sockaddr *)&server, sizeof(server)) == -1)- A% M3 X) O- C. B) D
- {, @6 Y! J" d. b' c$ P0 V/ q
- /* handle exception */! Q; H4 P( Q# c- }; i
- perror("Bind() error.");
. L) B& D6 T% _# G' {4 @3 p - exit(1);
3 p% F6 T/ D# t J( s - }
9 V+ ^& @ }" {+ f: W/ x -
* G) T$ N; R, `9 p, F* L - if(listen(listenfd, BACKLOG) == -1)
0 F6 s, N4 _$ B& a* z( t$ Y - {
$ H1 n2 q" T& Z3 T$ l N; u& N - perror("listen() error. \n");
' `" }7 a' V$ { - exit(1);
7 F1 i1 O ]* @/ g* S* Y- `& z - }/ } \) s \7 j3 Y( P
- ! P; [. [4 P% z! w$ P, G" w
- addrlen = sizeof(client);
\5 ]$ {% ]3 m/ c0 N/ J- N. P - while(1){* k6 o8 w) t: ^! _9 i, a3 |
- if((connectfd=accept(listenfd,(struct sockaddr *)&client, &addrlen))==-1)0 C4 ^$ b4 p7 r+ Y: I" J- v
- {
$ k5 u1 S8 j. Y8 i- @+ m% c0 S6 @ - perror("accept() error. \n");3 `4 ]( |7 B# ]1 z7 j2 ^
- exit(1);6 |* x: \4 z7 }% z( i
- }( w- E5 {7 o8 I8 p' m" o
4 M- u' T0 q. @- struct timeval tv; Y3 [& m# I1 J1 e: d5 g& F
- gettimeofday(&tv, NULL);
9 t7 y1 w- D0 ]* H9 A' M0 A - 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);& p9 x) a' _) b% I6 j% `8 E7 z9 M h
- , |5 P' [- ~/ W/ g) m* V, e! e$ ^
- int iret=-1;9 y: N0 |$ S! a$ b' m+ P
- while(1)3 e/ ] J" s2 B! A; s( L
- {/ b1 `: q9 l- [3 T% T
- iret = recv(connectfd, buf, MAXRECVLEN, 0);
5 c; ?' z- n _( X1 C5 Z; v - if(iret>0)
, J. f3 W6 a9 i$ U7 E$ u - {
o) r) r5 y2 p: J - printf("%s\n", buf);0 C0 ?' V5 o: V" I9 g# c$ Z. Y
- }else
# D. O2 r! C% x( @% ]+ G* O - {& Q4 Q# e( z* u
- close(connectfd);; _5 h% p, y3 z { i) T: J) r7 l
- break;% W1 N: G1 S6 p6 h+ L; i; }$ X, A
- }
: C- S0 {' ?/ d# N0 V# K - /* print client's ip and port */
7 T* i7 J; _# M' v - send(connectfd, buf, iret, 0); /* send to the client welcome message */
, r4 ^* G+ K7 J2 V6 b - }
* d8 e1 m/ s6 }+ u5 G- A) j6 a! y - }
! r2 n1 b5 K2 t& c" b9 S - close(listenfd); /* close listenfd */# J' l" d* o: A5 w0 T
- return 0;
& o; j* K# `' Z) ~$ O3 G9 M% t - }
复制代码
- n' T" o6 ]9 `! g; D
5 @: ^# [1 h0 ~& K/ |; {(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
7 x8 `& F/ |' \ - . [! e- }7 f3 ?$ f9 R
- server message:horst
复制代码 , n! L! a0 z; l" I+ B, k
服务器端:
- $./server
9 I0 L" V ?9 F( b0 j - you got a connection from client`s ip 127.0.0.1, port 60865 at time 1418281267.643428
复制代码本程序客户端会自动退出,服务器不会,因此如果想停掉服务器程序,直接在命令行界面按键盘Ctrl+C停止。
程序实现的功能很简单,就是服务器监听4321端口,客户端与之建立TCP连接后,再发送字符串“horst\n”到服务端,服务端打印出来,然后再把字符串传回给客户端,客户端再打印出来。然后客户端关闭连接退出,而服务端继续监听4321端口等待下一次连接。
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作者: admin 时间: 2020-5-9 01:48
服务端启动,客户端通过ip地址连接服务端,然后输入要发送的文件名,发送文件到服务段.) f) V) c: G+ I2 D5 | p( c
- /*client.c*/
" M3 U( R+ T- {# l9 y - #include<netinet/in.h> // for sockaddr_in ) E0 [0 H$ ~+ m q
- #include<sys/types.h> // for socket
' M' c# [, ]4 E1 u - #include<sys/socket.h> // for socket ) ?4 Q9 G# t8 F# K5 }5 q, R
- #include<stdio.h> // for printf
7 p0 y& l w4 J& l) T - #include<stdlib.h> // for exit ( A. g2 f! L' ~) X; @4 x c
- #include<string.h> // for bzero ) u% u0 ]' P# ^5 n0 I" {0 I
- $ q7 D$ r' ]8 e% r3 _! r6 o. l3 U
- #define HELLO_WORLD_SERVER_PORT 6666
9 N8 G5 M' a4 L( s- k7 U& g - #define BUFFER_SIZE 1024
: q% K, n( H! ]& i$ y - #define FILE_NAME_MAX_SIZE 512 P6 @8 Y! W+ X2 R
- * P. I0 m" ?! C4 E# `
- int main(int argc, char **argv)
4 l$ b7 t& R* ?9 n" C* L - { : f1 A2 u+ \3 v
- if (argc != 2) 0 X7 C5 D( L8 R" q# F, ?+ ]+ {
- {
, v, f/ V; K: f- Q3 d! @# d' d, ~ - printf("Usage: ./%s ServerIPAddress\n", argv[0]);
( }3 e" v& R$ x! ` - exit(1);
' l2 |+ X% v1 b8 V2 X! V - }
4 k( y0 K B& j+ K7 ]' P Y: l
7 L0 I% }7 b3 A8 `7 M+ A- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口 2 J4 x$ @+ L) Y$ t- \; B- A
- struct sockaddr_in client_addr;
; z6 z$ y e7 L: L1 b - bzero(&client_addr, sizeof(client_addr)); 4 r$ a# A+ K8 d S
- client_addr.sin_family = AF_INET; // internet协议族
8 X& L8 ?0 J2 I" Z) g/ ^ - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址
$ u% M( z/ S# j# q0 S; a - client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口 % O9 k5 I$ q" H3 M ]0 [
- ) [1 c# Z" v) V4 ]5 D8 d) K$ q
- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
+ x1 G& M' Z6 f* x. { - int client_socket = socket(AF_INET, SOCK_STREAM, 0);
- ^0 t! V' T) @2 |$ ?1 s - if (client_socket < 0)
& O* m/ q" `$ ^ - { ; i" A2 F4 p; r) j- U
- printf("Create Socket Failed!\n"); 7 N! |( Q% v! _& Z m
- exit(1);
$ _7 X5 X) b0 Q5 m8 E! e) X6 W - } 1 W/ r! N y* W$ d7 o
- 1 e x' J8 G8 ^5 L$ C$ U
- // 把客户端的socket和客户端的socket地址结构绑定
1 V0 a9 W+ a Z! O( s9 | - if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr))) 9 S3 G+ Z/ ?! _4 \; ]& W
- { & D# P, \/ }+ ]* i# n' B. r
- printf("Client Bind Port Failed!\n"); . y- o2 c2 L# I4 t" V
- exit(1); ' c) U4 R/ T3 @* H( @( h
- } - ?; @% S% |8 C1 Y- I
+ |6 S5 B4 O- z9 [- t- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口 . I" h, ?9 Y* T9 m! t
- struct sockaddr_in server_addr;
) L% Z3 z+ @; U. ?+ M0 ? - bzero(&server_addr, sizeof(server_addr));
7 N- R5 m! q( D" r - server_addr.sin_family = AF_INET; 6 _; l# K4 i' V6 b5 V
4 g% W2 o, Q8 S8 r4 F9 O+ x, b" R- // 服务器的IP地址来自程序的参数 ) z; ]1 c4 [& ]0 }% W
- if (inet_aton(argv[1], &server_addr.sin_addr) == 0)
3 O, j2 x9 P% G; S# J - {
/ n) h7 `1 _$ y* g# ^( g8 _ - printf("Server IP Address Error!\n"); F3 S2 E/ ?, L2 [
- exit(1); * S4 G! d& f/ d' A( w- T! b
- } " f+ C! T/ {0 b2 a) |3 \$ _
1 Z1 U7 d, E3 ~, s- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
* K. C9 P" F2 l1 X$ S, @0 T0 T - socklen_t server_addr_length = sizeof(server_addr);
6 ~) t6 J9 S: l- V: S4 f' h, O- I
& p& d8 S9 V- |, w! D- // 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 ; x2 E! l) L- @( l, E! t: i
- if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
0 X' ] X, N& O N( s - {
8 R( B. {% W) e9 H3 y - printf("Can Not Connect To %s!\n", argv[1]); ) b3 J4 G3 I3 _0 b5 y2 T
- exit(1);
2 v+ i6 k& j) S& h1 p) M$ w - } 9 v4 b' `' h; F7 b
- & L! S* g4 w- }0 M, \/ L: V
- char file_name[FILE_NAME_MAX_SIZE + 1];
' v3 v. |/ |2 y2 r6 V - bzero(file_name, sizeof(file_name));
% D' i! o" r7 k* z2 x - printf("Please Input File Name On Server.\t"); & o2 @% V8 u% h- V5 P
- scanf("%s", file_name);
4 p" m/ G! A1 L j3 V9 }$ C; i - : W% r3 r3 z2 F# M% s9 C
- char buffer[BUFFER_SIZE]; 4 t/ s! x* q0 X3 p5 V/ L
- bzero(buffer, sizeof(buffer));
" B( m! U: h4 X1 L$ \+ c - strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));
( k: u& r* g/ c5 \) p9 s; G - // 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 , w2 I# h: F' q7 z9 T
- send(client_socket, buffer, BUFFER_SIZE, 0);
: {1 q( H, @- }0 g) G. r5 q1 p( h5 l
$ t4 I6 j! A I$ P3 p3 G9 U- FILE *fp = fopen(file_name, "w");
# e* ^- c( A7 W, ]# k/ W" L - if (fp == NULL)
$ f; g* n/ j! z6 p* f% J; k1 ~ - { 8 a$ h7 Z1 t3 @
- printf("File:\t%s Can Not Open To Write!\n", file_name);
7 g% K$ \7 }( ` - exit(1);
. }8 a; }, p' } - }
0 I2 G* ?6 L$ I/ M* u) Z - & d3 I }' p+ w/ q1 G" e4 J( o
- // 从服务器端接收数据到buffer中 + g3 N( C+ Z2 F' R Y8 {
- bzero(buffer, sizeof(buffer)); : t7 U2 t/ Q5 `% k& f* X; N5 N
- int length = 0; 1 U; H0 g! q: R- ~# N' F
- while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))
$ k, d$ |5 T2 I+ s% F1 A - {
7 E/ t: I8 I8 W. [" F - if (length < 0)
0 L) i) |* h+ Q3 @# ]: a - {
/ p' R6 h5 V7 l1 U0 u# x: T - printf("Recieve Data From Server %s Failed!\n", argv[1]);
) }* K& w% S y* i - break;
) p& L: e' r* U, D+ o - }
5 D- F* M, X- d! I Y) I' X
4 ~ M0 G$ f" M" I- int write_length = fwrite(buffer, sizeof(char), length, fp);
5 a/ r/ N, \8 p6 B* T9 _/ M4 O - if (write_length < length) : p/ l9 w) ?0 y; k( ^5 P
- { : Y7 T- z! I: G& `! G0 d1 y: [1 C
- printf("File:\t%s Write Failed!\n", file_name);
* Z( c( Q0 {/ e8 Y P& u8 m* N0 L - break; & Q: L" C R4 {* i
- }
: U* c- Y% d2 t. L9 k! X - bzero(buffer, BUFFER_SIZE); 5 b% L& L; u0 r" h2 o T' Q' @
- }
$ v1 E) n/ ~% L: ^, F* H5 W
' q' o- J7 x/ t% }' y# L- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]);
) f. S% P. I4 b* y- D* {. F$ l3 r, D
, i" s- z: o2 c4 d, ~2 q& ^- // 传输完毕,关闭socket
! W5 y M" j0 f9 v8 y: V3 M7 T - fclose(fp);
8 P% W$ W7 I" [1 v - close(client_socket);
: a" @* p( x- S+ b6 l) P8 e - return 0; ' ^9 d/ O; Z7 t7 [! W/ X
- # ?4 I5 o/ D3 I$ i4 \4 f/ A6 w
- } - F9 x$ r; p/ j
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复制代码- /*server.c*/
5 }# D" A# t4 o+ B4 ~9 O# s - #include<netinet/in.h>' k4 ~8 n, H6 E! |
- #include<sys/types.h>
! S% r% j s( S& J7 G - #include<sys/socket.h>2 d# b. m+ A* ^+ f# B
- #include<stdio.h> }+ f! K- ^! [: r- w! W0 Y
- #include<stdlib.h>$ q( C: k1 Q& d8 E1 }
- #include<string.h>
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7 T" \" k3 ?+ O& L, _- #define HELLO_WORLD_SERVER_PORT 6666 //端口号
! _+ a4 i! o* Y/ n - #define LENGTH_OF_LISTEN_QUEUE 20
% T+ K( O( J% G! {+ _" f - #define BUFFER_SIZE 1024
2 L+ v7 b2 l ]7 A# Z' u/ T) I - #define FILE_NAME_MAX_SIZE 512
! e, ~* @# N k% a+ [5 I2 i4 J - : S6 a# j1 `1 O6 h. ?, T
- int main(int argc, char **argv)
6 t. u- P- U& q, W - {
0 Y9 ]! a: ]$ |( o - // set socket's address information
^; w g9 ^# i" j9 n - // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
9 F1 t" g/ `* \: J" O - struct sockaddr_in server_addr;
P- B3 @0 L' T; W! ~7 q% u - bzero(&server_addr, sizeof(server_addr));
, O8 b; F( C( v& `+ A, [$ ]' O - server_addr.sin_family = AF_INET;$ f6 H# X N" ?+ ~ i( V& |
- server_addr.sin_addr.s_addr = htons(INADDR_ANY);5 y- R6 L4 _$ G- v) Z; ]
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);$ E" h. r2 L& ?3 P/ g! \- p
- 8 P; U7 B( U* O( q2 P% i# \
- // create a stream socket' a2 o* ]0 @5 E+ Z) X' B0 p5 J
- // 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+ w; j' m1 Q% T: G* u
- int server_socket = socket(PF_INET, SOCK_STREAM, 0);3 Q O' \: { t
- if (server_socket < 0)
$ G; q' M' {6 ]; H! f - {
5 C* \0 I3 o4 |. p - printf("Create Socket Failed!\n");3 y( S6 ^( ^) y$ G
- exit(1);
/ R& T; T; l4 Q$ t @3 W - }
9 e) R4 m1 ~. e$ Q5 o/ T% F1 v; j - , L3 a. O) W; U
- // 把socket和socket地址结构绑定
# P0 z/ f/ P+ f7 k* ?' E$ M - if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr))) p4 d! `/ a7 q: g J/ C$ `
- {
! `5 C- O" t6 b# W, G) q% f - printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);& l* _5 }. V5 X9 C* P0 M" K X% p
- exit(1);' x b% S; g* ?, H0 `* o! a
- }9 X' i0 Y8 e+ G: u. q
, m$ S4 V* [/ x; S- // server_socket用于监听
; v( s/ i3 p+ L - if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))2 t( k+ a" v+ F1 e* ~) N
- {
5 U9 x# x4 @2 C7 @. T; r - printf("Server Listen Failed!\n");) F' @6 c- b" H8 k% c
- exit(1);+ @9 T* Q8 r! z9 S5 J4 F, P) u6 c
- }/ E4 | T1 w6 t, ]# Q# i* t4 a
, f$ t8 Z# J) |; {2 {" J- // 服务器端一直运行用以持续为客户端提供服务3 n+ I) b% {2 p; G
- while(1)) [' j+ h6 s [" b% i+ t
- {1 q# l+ h4 J& X1 r. ~3 B9 S
- // 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accept
4 u+ j) E8 p4 q+ T7 ` - // 接受此请求,同时将client端的地址和端口等信息写入client_addr中4 W+ Y( Q/ U' F( Y+ b
- struct sockaddr_in client_addr;
6 j- Q( }$ @+ n9 B4 M' b: S - socklen_t length = sizeof(client_addr);3 F# y% Y3 m/ t2 _& T
0 i4 g9 l4 e$ g) I" `# Q! D- F( T- // 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# i1 a; f* ]/ I3 ]! ?
- // 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% V8 N3 j% E0 ?, A9 E- O2 B( }
- // 用select()来实现超时检测
# a) o9 Y6 v, t; a- ? - // 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( Z0 @/ c, N/ q3 c
- // 这里的new_server_socket代表了这个通信通道
! }7 S& ~2 e4 X- t; j' W m" } - int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);1 g9 o' t6 K* k( t5 g* x
- if (new_server_socket < 0)
3 n0 `; S3 K6 {6 U# B! c: k - {. T, s4 z$ X8 c/ e! j3 W3 o# e5 I# W2 `) [
- printf("Server Accept Failed!\n");8 Q# X! q0 w1 W, U8 H3 ~
- break;
* y1 T1 m; @7 i6 A - }
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- char buffer[BUFFER_SIZE];
, m# l7 h8 i9 k. e9 Z" U - bzero(buffer, sizeof(buffer));
7 Z9 w. G* @, P# p1 U! b( K - length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);
3 @8 G0 i: t! m2 s' V: Q - if (length < 0)( i2 T" p( D6 I( a x
- {
# s' k7 `8 |* K( a* t) o5 O - printf("Server Recieve Data Failed!\n");
6 r& C* b. }2 ?9 c6 M. [ U - break;# J8 V* w1 y- J8 H
- }
6 ~+ `7 c: V8 M% s
! m8 Y0 c& e7 C/ i6 Z2 ^- char file_name[FILE_NAME_MAX_SIZE + 1];
+ m- O+ @& w# K* p" _ - bzero(file_name, sizeof(file_name));0 @# O% a3 v: {( N( \* x- ^) _
- strncpy(file_name, buffer,
# Z }4 T! R) y2 ~& v$ J- C5 B - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));$ x7 X' M% o' @- e% ^
- 4 E) m1 L9 M" I& h4 y; V# P
- FILE *fp = fopen(file_name, "r");
# g$ t' C/ _! J6 w6 `- u2 e. @ - if (fp == NULL)( f1 l7 M- H; ~7 X5 d8 {8 ^5 U: S
- {" h& i7 z& C2 @! ^; V
- printf("File:\t%s Not Found!\n", file_name);2 O$ z$ ^. M5 }$ f' ?% K
- }1 {. U) v ?$ R4 h
- else
: r ~4 i9 G' }1 U! g - {: y% H' r& K! o% y/ N$ u4 f$ T2 [) R
- bzero(buffer, BUFFER_SIZE);+ @; D" Q1 w1 X4 c
- int file_block_length = 0;# K5 ~! W! n) |- b
- while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
0 A' [6 c0 c4 x6 h1 P - {
4 o' _, ~2 F/ E. O - printf("file_block_length = %d\n", file_block_length);
% v0 V) x, [! B1 t% C2 u; O9 S( ^ - " S" K1 o9 r3 P
- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端0 D, r* c/ X( O9 v3 _: t
- if (send(new_server_socket, buffer, file_block_length, 0) < 0)1 L1 X6 Q& w# s+ p1 R0 @6 L
- {# m) {0 i* [- i% Q* q* `3 v7 T. x
- printf("Send File:\t%s Failed!\n", file_name);
' H$ F5 }8 v3 f" a- H4 {4 C$ ^ - break;2 d7 ]8 H- x8 {3 p( p3 z0 j" `
- }; H F3 e6 ^1 K
& ? Q+ m4 d" E3 C% ?) x( O- bzero(buffer, sizeof(buffer));
7 a1 R* Z0 @4 E - }( _$ N4 l& w& D; m/ O
- fclose(fp);6 S k- H) o( G7 F0 K7 g
- printf("File:\t%s Transfer Finished!\n", file_name);
4 o- s) i, _$ }4 N' ^, D, y - }
6 M0 F" X( X$ x) p# T8 O - . [! y/ U+ O& L4 H8 T S
- close(new_server_socket); w8 ]7 A' p& Q* ?2 Y; K% x( O
- } Q9 U2 @0 ]4 \! ]% _& y; @
0 `* t: `* d4 d- close(server_socket);* q/ h8 }- B( `% U& y e
. A1 `" v9 u: B4 M* R4 t, `- return 0;
4 F) h ~# c3 q0 X/ |/ `. W - }
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