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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 @" Q$ x8 E2 d- A% _( f(1)客户端程序,编写一个文件client.c,内容如下:* R/ I; |0 O' b
- #include <stdlib.h>
+ a5 I$ v; s4 \5 L% u6 G - #include <stdio.h>8 t* X" Z$ t7 L* R* d
- #include <unistd.h>
# m2 c% R: U: v1 f/ ] - #include <string.h>/ _) b. w( W7 g8 b. {
- #include <sys/types.h>6 F! c$ `: V7 B. X$ X
- #include <sys/socket.h>0 I# ^' h5 V0 b4 \# d
- #include <netinet/in.h> G1 |8 N/ Y# i5 x' R6 _' Z
- #include <netdb.h> /* netdb is necessary for struct hostent */) ^4 e! P' S; J3 [/ u9 x
! ~. F. Z$ @* L- #define PORT 4321 /* server port */( z( b: O" V6 o/ {
- * z* C4 ]" \1 Z* j
- #define MAXDATASIZE 100' c: p: I- m- u( m. A) f
- D/ f5 _( x Z0 i# _& X$ u- int main(int argc, char *argv[])7 J5 [) o( S' `) H
- {. R3 B* ^" }7 w, x" k
- int sockfd, num; /* files descriptors */8 I# k, F+ }+ a# h
- char buf[MAXDATASIZE]; /* buf will store received text */
6 z6 h. s, ?% l - struct hostent *he; /* structure that will get information about remote host */
. z6 Y0 j6 V8 A - struct sockaddr_in server;3 V9 Z, x- @. D X2 G! N
-
- C) L. }7 Q) x% T1 k - if (argc != 2)+ L# R/ p' Z0 a' w( U' V- Z% @
- {
! @: e/ |1 e/ B. N - printf("Usage: %s <IP Address>\n",argv[0]);
6 I2 R' X7 |2 w - exit(1);( @9 r$ L& g% X" \8 E" g- B
- }: Z3 n7 ~. K% h
- 4 {' Q k f6 O0 ~2 {
- if((he=gethostbyname(argv[1]))==NULL)
" N4 H! E9 _+ C& U - {
3 t' ^- O, `# G - printf("gethostbyname() error\n");
1 x( x1 F0 G% C - exit(1);: m* ?7 K3 O2 e' L+ h1 l, p5 Q
- }
3 R# }/ V8 @; i; `% ~# G1 y0 P -
- o1 W3 u: I6 G V' O( H m1 l - if((sockfd=socket(AF_INET,SOCK_STREAM, 0))==-1)
, Q' t% |! j8 c7 E - {
Y- r8 T8 X9 c9 H. Y) D- [ - printf("socket() error\n");1 V5 v( b. s- n
- exit(1);. R2 Q$ R) V0 R& y2 P# t& D0 W
- }
c" ?2 B, R) v' j - bzero(&server,sizeof(server));/ s, Y- V3 p. R& b
- server.sin_family = AF_INET;, Y% P1 u' I( X+ i
- server.sin_port = htons(PORT);$ l! _" J5 {. k/ A5 V
- server.sin_addr = *((struct in_addr *)he->h_addr);, E) W! C B6 b: Y0 ?+ `& _, J
- if(connect(sockfd, (struct sockaddr *)&server, sizeof(server))==-1)
: T& v7 W& k& M - {. y' d$ F9 w1 k; w5 h" q
- printf("connect() error\n");
( x$ F+ q8 ~- n8 ~( T - exit(1);
% v/ F2 r, X- h* _2 w9 s% e$ h - }
7 a4 F4 X: k8 [( T+ Q -
' Z [6 L1 h4 Y - char str[] = "horst\n"! X7 n1 W7 ?1 j# B; P
2 c! f" p: ?& Z4 X8 P; g: x- if((num=send(sockfd,str,sizeof(str),0))==-1){6 ~- Z! j9 N5 z' N/ A4 [) j
- printf("send() error\n");
% u' b' z1 [. a& P2 m2 R$ h: g5 G - exit(1);* Y" `/ y% M" f! r4 M+ v
- }- S: n# X% e& b. O/ t( N
- if((num=recv(sockfd,buf,MAXDATASIZE,0))==-1)% d* S- w. o* ?5 C" ]7 u
- {
% Y" `' P3 ]1 M# O6 `; T - printf("recv() error\n");
3 ?& Z, Y8 O0 S+ ]9 g- D - exit(1);
9 S" I5 M7 C2 ` - }. u. [; |5 c2 s, U0 `& o9 X8 Z
- buf[num-1]='\0';! ^. v+ q' [1 j5 W
- printf("server message: %s\n",buf);5 x' e# |; `! g6 E* t2 q) T
- close(sockfd);
% u0 V; H8 w" N) f6 k, k/ | - return 0;
( i4 Q) r4 D6 U! N2 @ - }
复制代码 (2)服务器端,编写server.c,内容如下
' \; S3 h: ?$ n4 b) D+ }- #include <sys/time.h>
3 E8 _$ n% `( a' a4 C - #include <stdlib.h>
, z7 N1 @8 M2 b( w& j. _4 ?6 n - #include <stdio.h>
9 t0 C. y& R: i7 j - #include <string.h>
: c2 T j5 v( b- m1 ^6 r* A( j - #include <unistd.h>4 }. A. H2 `2 Q" L' G; q) }
- #include <sys/types.h>
) l4 d2 c9 ?, |( i9 x, m - #include <sys/socket.h>' k! L* u3 e. r T" P$ u" d
- #include <netinet/in.h>, s, D5 Y% r. |3 c5 _, }
- #include <arpa/inet.h>
$ e8 Q- V- B0 j" \! |# T- I
( D( s) D; n* ~9 e- #define PORT 4321
; f0 ?2 y% L& H" t - : l5 @, n% ^4 L* G8 Q1 C/ u
- #define BACKLOG 1
# Z- k7 p, L6 N& ~) j - #define MAXRECVLEN 10240 ~# N, ~& i- l1 y. c& r
- + e, g5 k6 v" r/ W9 E- ?' g4 U
- int main(int argc, char *argv[])
0 O$ a) x2 L9 o, { - {0 ~; S( S7 J2 v$ k! T% r/ A
- char buf[MAXRECVLEN];. }) ^7 N$ K% A
- int listenfd, connectfd; /* socket descriptors */' A4 I% G4 Q7 }# `' Q
- struct sockaddr_in server; /* server's address information */* p, A3 y/ C+ r" q1 f3 |- B% Q
- struct sockaddr_in client; /* client's address information */
. C0 _ |* Z, o* B5 U. W2 g. ], y - socklen_t addrlen;( W3 U1 s+ {9 a
- /* Create TCP socket */
+ ^ E5 ]8 l, L1 J, P# g - if ((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
3 [7 y, R$ J, Y9 J( W0 ]6 D/ u - {% `) k% x+ f) [
- /* handle exception */
/ M- r8 ~; y$ U& \( d$ P - perror("socket() error. Failed to initiate a socket");
4 z! \2 `3 K0 I5 y9 O9 { - exit(1);
. S5 k7 {) T, c! f" n; v6 B8 X - }
) _! ^1 A4 d# `! @: D& ~ -
3 Y: [" N$ x7 F/ Y& l |+ k; @8 S - /* set socket option */3 M) a2 w. r8 h' w) r
- int opt = SO_REUSEADDR;/ f( j% |( H# H7 t& {$ t& X
- setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));& e% G- O& W5 j$ q' v: ~3 h
; t% N7 T( E, k2 H7 w( o( W- bzero(&server, sizeof(server));0 y* d# `9 Q* f' |6 A+ v
+ ?) q# M5 C& n. U" O+ P, H) F- server.sin_family = AF_INET;
& P; W5 v5 u8 j* v2 ` - server.sin_port = htons(PORT);
! _0 `+ i0 N2 k( T) S5 i' n/ p - server.sin_addr.s_addr = htonl(INADDR_ANY);
) H8 L" R( d/ O - if(bind(listenfd, (struct sockaddr *)&server, sizeof(server)) == -1)) ^7 V g, \4 W! j% d( y: {
- {
2 }2 `, O! S( \* @/ V - /* handle exception */
1 p) }! a0 u a) H9 e8 s( N [ - perror("Bind() error.");
& c1 F/ V6 u. Z: p2 W - exit(1);
" N; O9 G- z- g - }
, w' J# }) g9 V" y7 S& p) z - ; x$ i0 O, U! Y" Y% S7 O
- if(listen(listenfd, BACKLOG) == -1)
6 f. Q: s, ~4 J; n0 q8 ` - {
$ j5 L! H: v. W7 {7 _& y - perror("listen() error. \n");
2 X2 w" @, _( ~ - exit(1);* s" L! T: {6 E- B% F& k$ O
- }( [! j7 t7 b7 Q) z% G+ C+ n
- j' \ S& A- v$ J1 `, E
- addrlen = sizeof(client);) R) Y& T) U- Y/ I+ D: ~ C
- while(1){
; p* t6 m) ?+ e& y9 o" a; i/ H( a - if((connectfd=accept(listenfd,(struct sockaddr *)&client, &addrlen))==-1)1 m+ v+ A/ f6 Y$ k) M
- {
) y) t9 D4 l5 V# V9 {3 V, E8 W - perror("accept() error. \n");
& d( ?) I& K( Q% n. t - exit(1);
9 t, P5 O$ S, U - }
9 g/ f" p( Q/ _# v; h1 {' E( @
0 i' N# ?- Z4 U! Q- struct timeval tv;5 s9 M2 ]0 p7 R. z/ `
- gettimeofday(&tv, NULL);( Z) ]2 L# _9 n l
- 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);
6 u O0 V$ J; f( h -
4 a7 u" G Q d$ V8 ]$ p% |1 D) w - int iret=-1;
, t8 F9 B( Q/ I - while(1)
# C" _9 n. A) l5 P/ X- M - { ?! L3 J# |$ f1 T5 D
- iret = recv(connectfd, buf, MAXRECVLEN, 0);% ^; ], p/ N3 e0 b! A
- if(iret>0)/ A( p6 x4 a. }( F5 n" }5 s
- {- n& X; R6 [; o; }! x
- printf("%s\n", buf);* r6 W. @+ _! ^, d
- }else
# v2 }$ w6 T$ @6 v2 Y - {5 Z8 }2 x9 w6 C3 W* \4 H* F
- close(connectfd);5 ] w$ ]8 I6 l; g) H+ R5 j) @
- break;+ s0 G' y! [) ?% d# |
- }+ C6 D9 O6 f r) u6 x
- /* print client's ip and port */
- W" T9 D) L4 h) G! ] - send(connectfd, buf, iret, 0); /* send to the client welcome message */: E1 |$ r8 {( I, s# v/ ]% j
- }
: u5 Y5 V, S/ b - }0 g; R" m$ F7 I# }+ s
- close(listenfd); /* close listenfd */4 S9 d8 o" W( Y! \ e h4 o
- return 0;7 N4 H5 k2 ] L0 d& A2 y
- }
复制代码 % ~) R' s* c$ {8 F4 w; u
$ }0 I0 ]3 K8 R
(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 127.0.0.10 ]8 _& K5 V. j- D& s# n
7 D0 o8 K, r7 i# S- server message:horst
复制代码
! @" O& l2 ]2 r& f1 R服务器端:
- $./server/ k! a, }% ?, n
- you got a connection from client`s ip 127.0.0.1, port 60865 at time 1418281267.643428
复制代码本程序客户端会自动退出,服务器不会,因此如果想停掉服务器程序,直接在命令行界面按键盘Ctrl+C停止。
程序实现的功能很简单,就是服务器监听4321端口,客户端与之建立TCP连接后,再发送字符串“horst\n”到服务端,服务端打印出来,然后再把字符串传回给客户端,客户端再打印出来。然后客户端关闭连接退出,而服务端继续监听4321端口等待下一次连接。
* F! B% ^; ]2 F2 j5 t
+ P7 T7 H7 |* {# x" Q* y! J$ m; C3 D% F# d
) I$ }# c9 t) M: X1 {
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.
4 d% m* K( n0 ?% d- /*client.c*/
; `9 a/ J. H3 J; p, f - #include<netinet/in.h> // for sockaddr_in : y. I1 ]; C- a+ a% h
- #include<sys/types.h> // for socket
8 S$ l& ~+ r* J% c+ i6 @$ I - #include<sys/socket.h> // for socket
2 V$ U7 C4 ?2 b' J+ {& D0 q% b - #include<stdio.h> // for printf 6 s$ V: H: G* Z! o( C. P: g2 r
- #include<stdlib.h> // for exit ' M1 ?7 G- n; _
- #include<string.h> // for bzero $ F- Q4 j- i0 X' F: o
z& s/ v& V3 Y7 e$ H- l+ D' S- #define HELLO_WORLD_SERVER_PORT 6666 7 C i% ^0 T% l p, I6 `
- #define BUFFER_SIZE 1024
# n ~) x1 u6 M; R - #define FILE_NAME_MAX_SIZE 512
9 S8 N9 p+ U! A/ d# D& F, X& ^ - " C) N; E& [4 l7 b7 x% p% |- l
- int main(int argc, char **argv) % E) s: n& f0 ]1 \7 o6 P: ~: q
- {
3 c% C+ Z- P/ p- | a1 t - if (argc != 2)
6 D* G: A# D3 i1 ?; m6 P! A - {
' L; h# F. s6 k2 c8 Y. F0 ^4 e" w - printf("Usage: ./%s ServerIPAddress\n", argv[0]);
2 v/ |8 b9 |( R* ~2 P - exit(1);
2 N1 u5 W9 x+ C; N& p - } * V! P" E7 q) u8 @$ |4 \
0 s& A7 g* u7 @$ B: `3 U- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口 2 V4 V# x$ f8 v: D9 o$ h1 I
- struct sockaddr_in client_addr;
( ^! x/ y) S2 ^$ c& z( ~) l - bzero(&client_addr, sizeof(client_addr));
+ ~* b; e$ F8 X$ R# Q4 t - client_addr.sin_family = AF_INET; // internet协议族 ) O7 P7 D' n1 U" J. b; ]$ i
- client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址
: Q' [- q6 Y, G5 w9 a - client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口 + Y7 ~0 b) e l" N; H1 g5 W
( N* j- A S3 l5 T! @- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
0 Y# C9 t. _; i) \4 C - int client_socket = socket(AF_INET, SOCK_STREAM, 0);
8 n1 |) W. Z% \ - if (client_socket < 0) 3 t; X! L' ^1 A8 `) [
- { % D/ a1 O% O; W
- printf("Create Socket Failed!\n"); ! U+ A) b) n5 @$ S4 f$ E' v9 _' U" ]! ]+ _
- exit(1);
! D5 G1 \2 r; h. J- c7 ]7 ]5 r - }
1 S. i' R& i* l" g+ [' }! _4 P
" k5 O* w5 u! A0 o! w$ ^- // 把客户端的socket和客户端的socket地址结构绑定 & K4 U9 V4 n3 m; `: K% ^" M
- if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))
9 i3 e6 z& O; m! M% X - {
2 q; Y5 S6 f2 Q/ V3 Y - printf("Client Bind Port Failed!\n");
9 C8 w6 F7 W; A( ]7 n5 {1 u, \3 ^ - exit(1);
# D$ v' G6 v+ K7 F - }
; U/ J9 p/ b- z1 h5 N
7 C7 r$ |3 g- z0 g" k% `' v4 c- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口 2 o- p' D# }+ a* }# Y) |4 e
- struct sockaddr_in server_addr;
D2 _7 n0 e3 R# W2 ~ - bzero(&server_addr, sizeof(server_addr)); 9 W) a' {7 E! j
- server_addr.sin_family = AF_INET;
; q& P/ v/ n4 D4 l z - 4 {5 q7 \# _- S$ K% F7 B
- // 服务器的IP地址来自程序的参数
! F3 N( U7 z; |9 Q, u% ~8 T; e+ X - if (inet_aton(argv[1], &server_addr.sin_addr) == 0) 1 ^9 u3 b) y1 f0 U1 @
- { 7 W8 o1 ^ R# _8 b8 r+ o
- printf("Server IP Address Error!\n"); + l8 }& @4 G$ J) A" }* b
- exit(1);
4 ]% m2 X4 U: R+ h& s/ w' d - } * w5 ^$ O* {' ^ x7 w
B) u3 R9 C, L) ~+ p. m. k- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); + F& d1 ]/ t) z/ S' _: }
- socklen_t server_addr_length = sizeof(server_addr); 6 {" V" ?' I3 b) [% Q( y% a% h
- 9 X: e& s7 V. W% T
- // 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
3 y& a# A f1 l5 T - if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0) 6 T5 j! L$ m5 T7 n0 k" ^, U/ J
- { 9 u% `+ R5 Y/ M. }: P1 H
- printf("Can Not Connect To %s!\n", argv[1]); " @1 R& p9 i8 o5 o; O8 `* g" V
- exit(1);
O& F' m6 W; N' j1 ~/ u - }
8 y4 @9 s' O g
) C" [3 N5 b2 t8 b3 F# [& }& G: ~8 e- char file_name[FILE_NAME_MAX_SIZE + 1]; ! B# c* v1 ?1 J; K$ e6 w- G
- bzero(file_name, sizeof(file_name)); 8 Y N: y" @. Q0 V
- printf("Please Input File Name On Server.\t"); 9 F+ [6 f! E# z8 ?+ A
- scanf("%s", file_name); $ k! w7 o- l/ n, u" u; |
- , U/ U: f& z' V3 w5 y
- char buffer[BUFFER_SIZE]; 6 V( z( q; j4 A2 o: g5 l
- bzero(buffer, sizeof(buffer));
2 F8 ?4 T5 |+ c e - strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));
: h# [/ x8 A, R+ S - // 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
2 X9 v3 ?9 e2 }4 k - send(client_socket, buffer, BUFFER_SIZE, 0);
; E q3 d- {' y9 @* v3 @ - / ?; ]- {* ~7 c' k
- FILE *fp = fopen(file_name, "w");
- K- J' | x5 I* W0 _ - if (fp == NULL)
, Z( P5 F6 x: \* W - {
% S- Q3 G- p! ~: y& w: K - printf("File:\t%s Can Not Open To Write!\n", file_name); - i4 [, ? j( V6 O; Y4 x
- exit(1); $ ^% ?# g* A/ i4 Z0 ^. m7 Z5 w" V
- } % |' D2 K7 s/ x( ?$ R1 Z3 D
# w* ]5 ?" c4 m# X+ G! H- // 从服务器端接收数据到buffer中 + @4 F: `9 F* q* I
- bzero(buffer, sizeof(buffer));
+ W/ p3 Z& A V, B3 \ - int length = 0;
3 [/ H& n0 S5 ^! a, @& d- W5 T - while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))
& n: j# A6 |- {) N( V - { 7 P3 G- Z6 }% l9 Q4 K# R
- if (length < 0) ! y( `8 _% ^& p8 O7 Q# x' X
- { 4 w+ e$ f' P2 X$ }+ n; X9 j7 T
- printf("Recieve Data From Server %s Failed!\n", argv[1]); 9 M" p# G+ A8 e
- break;
3 u9 t3 n) o6 K5 b4 u. r9 D - }
; J1 G4 j, ]3 j6 \. I
O1 D: @) U$ h! {' l; Z& ~- int write_length = fwrite(buffer, sizeof(char), length, fp);
6 g8 _3 V& P/ n& V1 i - if (write_length < length)
: D2 ^" r; i9 m& C; s - {
5 z) y8 E( e" ]% U3 p - printf("File:\t%s Write Failed!\n", file_name); ' c" {& c: J! I$ T! R1 W
- break;
: i; R2 r( W# x. u9 S - }
+ G2 {% r0 R5 w Q; i, I& w/ t. @ - bzero(buffer, BUFFER_SIZE); , ^( X: t6 T [
- }
4 h$ e8 n% j- A1 V/ D0 a7 f: w - & I2 v% b" W% m: [0 o) n5 W
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]); " [6 a8 s6 v& E2 v4 C- R
6 a4 o% l2 r& v9 g w) {( A+ p- // 传输完毕,关闭socket ! e$ T A; ?! t
- fclose(fp);
/ y4 S. l P$ Y6 K" { - close(client_socket); 2 k4 i& ]1 H, g. g1 L- L4 q
- return 0;
. \5 i; N" y, J' Q7 U+ F
6 J2 S, ^) x4 r' {: h- } + I9 z" S2 P$ R+ I. e5 Y) x9 {- S
- 9 o8 \, V h( E! g D
复制代码- /*server.c*/+ l8 `- a" F- @" Z
- #include<netinet/in.h>% u3 g. X0 r2 @. m$ Y
- #include<sys/types.h>
& `! L M+ a* g+ X! v8 j - #include<sys/socket.h>
4 u9 [/ w! X5 M+ [$ m3 C8 q$ h - #include<stdio.h>$ X4 D$ ~2 N: b& K$ w4 a# H
- #include<stdlib.h>- {) ^2 u8 ^% `
- #include<string.h>
. O0 b" K2 ?' u; i# _. V H- b - 5 @7 A- t/ z/ s4 h/ y) l4 B
- #define HELLO_WORLD_SERVER_PORT 6666 //端口号
; E( g1 b) u8 B: w& ^7 e& { - #define LENGTH_OF_LISTEN_QUEUE 200 W6 e; b M: r, \2 L5 K X
- #define BUFFER_SIZE 1024
% ?$ S3 z. A0 l1 X$ H$ O) C' ]2 }9 j - #define FILE_NAME_MAX_SIZE 512; _& Y1 n8 _( j/ [( n! v
- ' ]# u7 z, s' W) L H$ ^) c
- int main(int argc, char **argv)( o8 P( N/ O- t
- {8 |- g4 H1 ~2 C/ j% [1 _4 c# I8 P
- // set socket's address information
( o" e6 m9 U& W& R0 D - // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
2 ?5 q- C5 i0 y& T- Z0 `9 |; e - struct sockaddr_in server_addr;
& X, Q Y1 w3 l% B G0 T( U) C6 ? - bzero(&server_addr, sizeof(server_addr));
9 S) ~5 P$ @$ B, m. K6 a - server_addr.sin_family = AF_INET; |8 p, d; a j4 y+ g
- server_addr.sin_addr.s_addr = htons(INADDR_ANY);
9 }8 e, M7 ^& \. w, ]0 D3 l3 a - server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);7 q) J# H J5 q
- - W; V; \ z5 B9 S0 B/ e
- // create a stream socket5 @- c* z. `4 G
- // 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
* |' {: t3 N0 U0 ? - int server_socket = socket(PF_INET, SOCK_STREAM, 0);
5 |! h: }1 t; m - if (server_socket < 0)
8 g I! y, f, h5 B - {6 N7 P& [# O3 p
- printf("Create Socket Failed!\n");" A$ N& v/ \& `. a% n- N
- exit(1);
# ?& L! Q8 r9 A( M9 L1 M2 w. w - }8 ^8 j" M: q2 a0 f1 \6 v& x* P2 u
- ; b) V% d6 \+ D
- // 把socket和socket地址结构绑定+ p9 l3 d) `/ _- I
- if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
5 _* R! V; {# j2 f/ |) ^" b - {8 `* X! f, h0 `9 @& }3 f" ~9 W
- printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);
) p. a M7 l9 d& R+ Z Q5 H% { - exit(1);
- \8 d8 r' @6 [7 }# l - }! R1 [/ \. c& h' t% v8 F; f
; w( j9 d- |4 x$ o* c* \/ a- // server_socket用于监听
! E1 l$ i |' C, A! @% ~6 h* ^ - if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
2 R d! D9 x+ @; y9 y - {
6 k% t9 n5 ^& N - printf("Server Listen Failed!\n");9 R0 ?1 A2 O( s- Q( Y% g, `
- exit(1);, B6 z! x ~ H% A. x" y9 y
- }
* B7 h7 Q% B' u7 G
0 r! U. K3 T4 Q/ B- X; b" N" f- // 服务器端一直运行用以持续为客户端提供服务* T) a3 d% J8 A4 p
- while(1)% }; P' m; d$ r# u
- {
6 [0 i$ u$ x; y - // 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( M2 ~) D* X* Q( R% o; F, f' P7 q/ I
- // 接受此请求,同时将client端的地址和端口等信息写入client_addr中
8 {6 D$ }3 V! p. O9 k+ f1 I - struct sockaddr_in client_addr;
* B9 `4 u" s4 K% C+ j) n - socklen_t length = sizeof(client_addr);& |% [6 I$ f+ x0 B' B& O1 d6 d
: O/ B' Z. }6 Q: ?; q# T7 |- // 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5 W; ]% x; W" V4 Q4 z S! l# M
- // 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
- t# m2 x1 \- k6 A1 f - // 用select()来实现超时检测
7 e$ T& ]6 {: V - // 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( I, A0 P5 w: S/ e
- // 这里的new_server_socket代表了这个通信通道
5 \4 r5 E% P6 N$ R W - int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length); g# ], g8 ^& V3 B
- if (new_server_socket < 0)
J9 q6 v- G4 H L" @# _ - {
3 l5 I) ^) h; I1 w% a8 F) W - printf("Server Accept Failed!\n");
, X5 S* {5 V4 k. h5 N/ c7 K - break;
; Q7 F& B$ A; F3 P" P# f - }
/ h/ e5 r$ L- P( W& C - 1 v" e! E6 w" _. a. g" _
- char buffer[BUFFER_SIZE];, w7 o# N% \" ]
- bzero(buffer, sizeof(buffer));. Y9 @0 K2 N$ Q! g2 N# X
- length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);" Q: B* U2 f% o/ w; f
- if (length < 0)0 t. t- _* q6 G' F8 [; ]
- {
- ]# v/ f9 Y! T! s6 y3 g - printf("Server Recieve Data Failed!\n");" f! ^, n! ~& Y3 |/ _6 {
- break;) m" n' D5 W# u# \& Y+ q
- }, v& b' ]6 S( j" h6 e
- 6 t5 ~2 ]: x* A; P1 f
- char file_name[FILE_NAME_MAX_SIZE + 1];
! v- S% x3 |; K( A - bzero(file_name, sizeof(file_name));' [9 l7 F h5 |4 y- M
- strncpy(file_name, buffer,
/ c8 y( T7 U2 O - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));5 {( U2 S4 f& K3 M9 W. c) p
- 4 T& @ m4 [( W/ P( {+ A
- FILE *fp = fopen(file_name, "r");, [4 t# e' U* G' V
- if (fp == NULL)& t, }: P- k8 Q6 X; o4 H) G/ l6 P. F
- {
9 g9 c. G( n: H; J7 |8 ~ - printf("File:\t%s Not Found!\n", file_name);
$ i( ^& v# s. h* M; t" o - } O7 T! l3 c' Z5 G) Q5 B# g0 B# p
- else3 S! f2 T9 h# d& e
- {
0 M2 P0 ]! a; n5 J - bzero(buffer, BUFFER_SIZE);; |8 k5 F# G1 a2 B2 Q0 h
- int file_block_length = 0;
: j0 y1 R$ F( i+ f6 [6 l - while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)4 M) x' a' q; R7 G7 L7 p
- {
: {( v& u( ?1 L$ u! T) y1 P9 v - printf("file_block_length = %d\n", file_block_length);! K5 c+ |+ ]' |( k' K' q5 O
+ q- q1 n) A0 h7 F e: G H- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
, C) b d. H+ ~% y4 {7 ?' } R - if (send(new_server_socket, buffer, file_block_length, 0) < 0)
0 \6 l$ ?: H, R8 U- [ - { i( b2 U- g; i; b
- printf("Send File:\t%s Failed!\n", file_name);4 Q; i" b, _& B" p8 _! [$ [( i/ T1 Y
- break;
5 O. ?: ]* Q3 J7 q- v, a - }
" X1 O$ o, k3 ^3 C, [ - 0 X( y( M% H( r$ o8 O G
- bzero(buffer, sizeof(buffer));
2 q& Q1 B9 d# m" L: i: F - }. R( g/ y6 f, e$ G) ]7 T) G
- fclose(fp);/ D8 n0 H! A6 R" U3 I
- printf("File:\t%s Transfer Finished!\n", file_name);
) L. r/ K r$ g: l! \ - }
' L( _$ D, M. Q6 W$ }3 v1 G5 r
; e2 g( a& y7 M" m- close(new_server_socket);
* r4 Z% w/ [# p+ U' N - }' `, Z0 v5 z: w* A7 q) F9 v
- . P" F* X' j7 M- U- A
- close(server_socket);6 S. a* J0 f. O
" T$ z( Q0 c" [" g {! A! b1 {2 F- return 0;
2 ]* T8 D7 [: O! e9 e - }0 R; v" P% _! Y# q9 ^
- . o' a* M% _' P* r
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