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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。1 K5 o* ^* ~6 R+ I" B8 e
(1)客户端程序,编写一个文件client.c,内容如下:
# d3 {3 M* ^6 r& P9 C- #include <stdlib.h>, n) B5 N) {3 c1 ~0 m
- #include <stdio.h>
- L2 [4 h O4 G M+ @! | - #include <unistd.h>
( F, x) ? R* s/ p7 V - #include <string.h>
# H+ G/ N" o1 W* D - #include <sys/types.h>2 P. l* k) {1 w4 }9 M" I, K& p
- #include <sys/socket.h>9 X8 j% d' s; \
- #include <netinet/in.h>
* q5 Q; T0 O5 n) ?0 g$ L' E - #include <netdb.h> /* netdb is necessary for struct hostent */
; [/ \& L) M- k8 U - ( y# k, A5 I+ ~8 _& V
- #define PORT 4321 /* server port */( ~% a* O: ~4 @, K
9 \# [; K& i/ z' y" N3 Y) ?2 [+ m- #define MAXDATASIZE 100
3 L1 w, v* X) A2 ?$ X, H; x& s - , x6 W3 e& s( I
- int main(int argc, char *argv[])1 o2 D* N$ `# t
- {
% g8 b# k8 P" P8 s( k - int sockfd, num; /* files descriptors */. H' C* ~3 H& @. n1 ?( O) l
- char buf[MAXDATASIZE]; /* buf will store received text */
* b; s4 J5 n: m) x; }; c - struct hostent *he; /* structure that will get information about remote host */
& _6 c7 ~$ v& c0 T4 k8 C" i1 ^ - struct sockaddr_in server;
' T# c% J! x2 e6 J3 }$ B - . Y* f! O: U2 J/ i1 v4 m6 K
- if (argc != 2)
- G7 x, ]& J! i. \0 r. e9 | - {
4 h( p0 [% x: _* \ - printf("Usage: %s <IP Address>\n",argv[0]);& _+ V3 e$ ] v! e
- exit(1);% L" h- p% G, E
- }
# S- [+ E1 m( V5 d* U# ? - 3 j3 w! c1 P* N; u* n! R
- if((he=gethostbyname(argv[1]))==NULL)! }, _- ]% `7 g' a9 {: c1 s
- {
0 s' [7 g! Q3 |' s5 H - printf("gethostbyname() error\n");- O% R( ^# K! _& x2 M$ \
- exit(1);
1 t6 W- D& r7 G k$ a - }
/ x8 Q& M0 A- K% l F# r0 d) u - 4 B' c$ C: y) X# l# k4 M4 i
- if((sockfd=socket(AF_INET,SOCK_STREAM, 0))==-1)$ Y6 Z6 X% k8 L
- {3 s+ v& @( H' |" V
- printf("socket() error\n");) ?- [ e4 y) D! o& \
- exit(1);: n% @/ E) G- M( q: p7 O
- }) |& S$ f0 U$ }$ O* T
- bzero(&server,sizeof(server));5 y' \' }0 x$ I9 b: r% e0 J
- server.sin_family = AF_INET;/ R) u4 Y. x$ U% n) f
- server.sin_port = htons(PORT);
- e# z+ j" Q: `# {: {1 V - server.sin_addr = *((struct in_addr *)he->h_addr);
1 k8 I6 V" {: L: U& `# s4 U7 D" u) r - if(connect(sockfd, (struct sockaddr *)&server, sizeof(server))==-1)$ K2 \( m0 A c% s
- {8 y2 R( t" y+ }" f8 f3 n
- printf("connect() error\n");+ w5 x- X: Y2 X
- exit(1);; _& A. F7 {6 ?
- }
1 g) A8 t# U, `& w) W1 i8 R -
3 c& B& `0 g( W$ a( y - char str[] = "horst\n"
0 S5 C3 z1 {1 }, Y v" x; l - 6 N' T0 y" N7 x
- if((num=send(sockfd,str,sizeof(str),0))==-1){
' Q5 k/ s$ F8 J4 D' E - printf("send() error\n");: W: [/ L( j0 a8 Q8 h# ?0 a1 l
- exit(1);9 `9 S: [4 W1 j" l
- }
" J; O" {" C" Q" g+ Q - if((num=recv(sockfd,buf,MAXDATASIZE,0))==-1)
+ g9 K' @$ q, |3 }1 d- z - {
* u1 G. E$ Z: w2 g; e9 Z - printf("recv() error\n");# r/ P* t5 b5 v8 r
- exit(1); N3 l' R( y' J* B) J
- }
: [7 I, D" P& J) n( I - buf[num-1]='\0';
# G2 c; P; y4 S6 ~! X, G - printf("server message: %s\n",buf);
" U1 T J L( `2 S& L. J% r' y - close(sockfd);
/ l) K& n0 U2 c. P& ^; A - return 0;( ]+ K/ R5 N" k7 t
- }
复制代码 (2)服务器端,编写server.c,内容如下; b, c1 X7 I- \& ?$ G& h
- #include <sys/time.h>
9 K& d* c- f; a5 b$ J* U - #include <stdlib.h>- [# [- J) ~# A s" M; L2 ^- Y( J% j# v
- #include <stdio.h>$ ?# D+ H( K' _
- #include <string.h>
' d- b$ F/ I x3 V - #include <unistd.h>7 L2 F) @; H# C. u; `! @2 V% L
- #include <sys/types.h>. p6 B" ]( ?0 a% V' V/ p
- #include <sys/socket.h>1 H2 N; n4 ~% {1 [' ]& @
- #include <netinet/in.h>$ k6 n$ A. i: w d3 I$ L
- #include <arpa/inet.h>8 l0 C3 b" e- p" U% [7 n0 P: M
3 G& y9 F4 G* P# X [- #define PORT 4321 o1 x4 _+ v* x3 ~9 ?
- ! r7 e) K1 d0 J4 }, n0 U6 X9 I, @
- #define BACKLOG 1& T9 B3 S4 s" N. D
- #define MAXRECVLEN 1024/ \- a8 b) K; `+ ~
- % n; i I* S, t! a
- int main(int argc, char *argv[])
Q9 W* b$ l g- R/ M - {- _7 }' b6 s5 i
- char buf[MAXRECVLEN];
4 ~! U p9 u3 V( R, V4 x9 t - int listenfd, connectfd; /* socket descriptors */: [* @1 a/ p& u3 i
- struct sockaddr_in server; /* server's address information */
( r% A+ ?. b: C; ? - struct sockaddr_in client; /* client's address information */
3 l4 E" D! q, j- H - socklen_t addrlen;
+ K3 _2 P4 J. _( T d - /* Create TCP socket */
, a- p6 r" R, j+ X: { - if ((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1), k' j. B( g: [/ I
- {
6 n3 X; F& A* C& }) ?! } - /* handle exception */
$ \) x- W. x& G% ~5 R: L1 E - perror("socket() error. Failed to initiate a socket");
" p' P. B& j! D5 n2 j2 p - exit(1);
& R: F8 Y% i& S - }
) N1 l' t& W% B -
; U2 Z& U8 [+ x6 A - /* set socket option */, V7 [ W \2 h8 w
- int opt = SO_REUSEADDR;, s1 ~2 D, l$ U+ m# h3 y4 ?: }
- setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));! k# M6 W4 _ q D
- $ v! B0 F5 Z# d' b
- bzero(&server, sizeof(server));2 q1 D. ]2 z8 _" u& \& J
- 8 {* V6 m/ {, Q" i1 z! \
- server.sin_family = AF_INET;' F9 e7 m$ r4 x$ q1 ~0 w8 G X
- server.sin_port = htons(PORT);
/ {( A( A5 _' ?; V% R1 I1 m - server.sin_addr.s_addr = htonl(INADDR_ANY);0 R1 ^8 D" o& p6 b- }
- if(bind(listenfd, (struct sockaddr *)&server, sizeof(server)) == -1)# S3 r' {, G5 p
- {! G2 v' V2 k/ @) a1 E
- /* handle exception */
8 Q" [2 B) z# [# y; v0 ~1 ~; r - perror("Bind() error.");6 g+ s: ]) E* |0 [6 L$ M" k# g( k
- exit(1);
: g+ @% Y j8 i3 } - }
) W# k& k! d) U; s. x1 y -
3 \- r, ^/ P$ ~/ M+ l- y$ D3 P - if(listen(listenfd, BACKLOG) == -1)# S: o3 I; k: L5 @* h& g/ ?
- {5 P# c! `' Y- S1 n+ q3 X/ z0 i
- perror("listen() error. \n");
n6 `$ k6 z- e2 t' E6 J, r - exit(1);
$ W5 }; i% v- L; \& g - }2 w* S1 W: \$ o1 A8 C. p. O
- ) k0 |5 C8 D0 A& m' f
- addrlen = sizeof(client);% s3 k2 V B' f" Y+ H0 y- N
- while(1){
5 ?& ~% V$ C- A/ s9 l. v6 W - if((connectfd=accept(listenfd,(struct sockaddr *)&client, &addrlen))==-1)' C/ x, e: M, a8 f
- {
7 R, F) ^4 m: O: {3 L - perror("accept() error. \n");
9 \$ M% |5 v7 @- C - exit(1);
9 A) S# \. \' n - }
' @( z( P$ I# m" ?- G) O - 8 ~7 e0 ]+ n7 D3 t5 z0 M2 l; F$ A; g
- struct timeval tv;8 w. w) q3 B0 ^2 c- u1 V5 A4 o) D
- gettimeofday(&tv, NULL);
& |9 I8 p" f2 E" f: [ - 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);/ o5 u% N& L: c* m/ A4 X6 D8 U' U
-
7 ^; q( ~4 d# B - int iret=-1;
G/ d( Q* s D: _3 A" P) O" { - while(1)
- s/ m' [/ H" E3 e" V/ ^1 F4 B - {
6 y: s5 r! I# U1 c& P" e - iret = recv(connectfd, buf, MAXRECVLEN, 0);
6 `* G# @- u: D1 c& f8 Y9 L - if(iret>0)4 c! E# s% D9 E
- {, b; z; E: q- n3 I5 T
- printf("%s\n", buf);
7 s! M; ^5 P) @- `) O - }else1 V# w+ q2 L6 } \! H
- {
c: _0 I$ z# m - close(connectfd);% `, {) o1 p8 y2 a3 u+ ~% d
- break;. W2 p& j* P$ W
- }
- r7 F3 D7 z) O$ n; Q. w! F" F - /* print client's ip and port */3 o/ T4 R% M6 {4 B- ^5 X
- send(connectfd, buf, iret, 0); /* send to the client welcome message */
/ o6 Q& Z7 a' @, d: s4 J D% u8 j - }
- M2 o. f& z0 U - }
# O4 a/ B/ e/ D) k7 n& ~: M - close(listenfd); /* close listenfd */; b7 Z9 Z+ v/ a5 p3 q
- return 0;
8 a) u) w& r) M+ O5 F) s - }
复制代码 : \ m; }; k G8 d) W
9 m* w1 r x& u(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$ p8 _0 A; m1 _
3 A7 n4 r9 l$ R# L) z. k/ y- server message:horst
复制代码
; f- `- N0 f8 v) i5 S" F( d# {服务器端:
- $./server, `: q4 A8 c4 s: s- b
- 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。
" v% r c& ` D0 \
% a2 N/ y7 m' u7 e0 K# u+ N# }6 |7 ^
0 c) g& \ Q, q7 U- ^
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.
7 Z: m: m _7 k+ z, V2 A- /*client.c*/
$ F: X% ]0 U9 Z; }# r+ |0 Z - #include<netinet/in.h> // for sockaddr_in
+ ]! Y, \: H' A& Y1 p - #include<sys/types.h> // for socket 9 z/ C8 s E3 o v# ?: h: W) I
- #include<sys/socket.h> // for socket . z5 {2 v+ B# t6 z& s
- #include<stdio.h> // for printf
. \$ T. r7 o) `' z - #include<stdlib.h> // for exit
3 T/ y( |( U2 g1 |. s - #include<string.h> // for bzero
. p( `: J' D; G7 O3 v - . r" O0 y- ~( C% m' y
- #define HELLO_WORLD_SERVER_PORT 6666 , H1 \) F6 X- Q' Y
- #define BUFFER_SIZE 1024
% Y2 Z" L( v8 p, i' ^4 J - #define FILE_NAME_MAX_SIZE 512
; z4 I4 ]7 c4 I) J! o - ) ~1 C/ m u9 Q `3 E- L. {
- int main(int argc, char **argv) " F: G0 I }! S. P1 y
- {
5 M% o2 y$ s' w* w - if (argc != 2)
4 r& N, {- y3 \8 V% M - { ' f" F" J5 ?' n9 @; c
- printf("Usage: ./%s ServerIPAddress\n", argv[0]);
: s( t1 \* S$ u6 z' A' h - exit(1); ) l' k a; R1 \5 A' O
- }
; e) H+ {% s F& ` E, \% X
) B2 g8 s; l' q! s: w' f- S- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
9 A0 i5 o% g5 w# \; o - struct sockaddr_in client_addr; 9 U {4 J3 P8 p' P- ~
- bzero(&client_addr, sizeof(client_addr));
4 O t$ a Z* y. A6 X! u# P - client_addr.sin_family = AF_INET; // internet协议族 ; O: P% h; r& Y, s4 v: }; d
- client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址 3 p5 P: R& Y8 A* B
- client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口
, n% W: N8 z5 C8 h8 L - 6 Q) O+ s: G% r: K3 D/ ^( @4 a
- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
' O: \9 z- M. i9 L5 j - int client_socket = socket(AF_INET, SOCK_STREAM, 0);
' L0 \ f5 c" g" G& b0 o9 o8 f; Z - if (client_socket < 0) & G9 T- j7 k/ {
- { 4 i- y. M, D3 C% U/ C
- printf("Create Socket Failed!\n");
" ^* H: s, T @' p5 v, ] - exit(1); - y( c* ~5 w% E9 Z+ S8 U0 ~1 t
- }
: G" V. M3 P$ _& ?
! l4 l, \5 [8 x3 i* S- // 把客户端的socket和客户端的socket地址结构绑定
" K: z3 I+ {* [. p! ]% n - if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr))) 6 N0 M5 P8 F) c" N
- {
z; O* O* N) G2 v- h( C9 f# V, \ - printf("Client Bind Port Failed!\n");
/ g! y+ S Q) Q0 P5 R" ^: I/ k - exit(1);
/ I7 x2 U/ B7 @7 g6 b: E. G( B) d - }
2 Q5 n9 t! v: _) g* M% R0 b - 3 }: P) i6 `6 o$ p3 ]
- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口 1 r, z) q& b) V% j5 Z" T; T! D/ b
- struct sockaddr_in server_addr; / l/ D3 g/ c8 a1 {) C
- bzero(&server_addr, sizeof(server_addr));
, m2 p N2 e( ]# d( G- ^' W: I* y - server_addr.sin_family = AF_INET;
; f F0 t% n* w7 @! z$ m8 k
0 A5 \: ]$ u; P; t' S- // 服务器的IP地址来自程序的参数
& |2 o0 ~& `( v- ^; B6 R) N' a - if (inet_aton(argv[1], &server_addr.sin_addr) == 0)
& p7 T: T2 x+ }% o - { Y( y- K# A5 _
- printf("Server IP Address Error!\n");
+ w. @7 x9 y: h2 x5 e+ s& L - exit(1); 9 m* `* i( n M4 c9 [) ^& G
- }
2 Y6 k$ ~/ o: r% o& E7 X - " V* n2 P. K9 j% v7 C# d8 A4 ]
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
0 x, n9 q5 D8 R5 D, p1 u - socklen_t server_addr_length = sizeof(server_addr);
- h3 U% p4 b1 D: B( U# A% x- W0 | - ( s$ p0 L4 O- }4 V' o
- // 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 , x5 N X& x0 [. c0 g
- if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
2 q3 u6 X4 p: D - { / ~1 n- ?% `+ i& U' J/ Y/ u- R
- printf("Can Not Connect To %s!\n", argv[1]);
% ~$ U: n5 G3 i7 M - exit(1);
: R8 m# N! B' g - }
% I4 v( t( S$ V% R) W* c2 _ - * S# l. \; `) l7 o: L+ P
- char file_name[FILE_NAME_MAX_SIZE + 1];
7 Y* R8 D% h# B& V4 n - bzero(file_name, sizeof(file_name)); ; r% a$ Q/ D z/ Q1 o1 e
- printf("Please Input File Name On Server.\t"); 8 W/ `0 D2 n M/ C7 [
- scanf("%s", file_name);
- H3 K v( B) |6 ^9 H3 ^
4 Y2 c. i: O" b; K; }- char buffer[BUFFER_SIZE]; ! F& q- k) T M( U+ A _9 e
- bzero(buffer, sizeof(buffer)); 7 [5 r, ~- t" S7 n
- strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));
3 S7 E+ K+ L7 a% L - // 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 ! Q* q2 Y" A$ A
- send(client_socket, buffer, BUFFER_SIZE, 0); 9 ]; b% _! r& }5 c1 `& V' w
/ x, T) _; P1 B# i6 C7 e* n3 }- FILE *fp = fopen(file_name, "w");
, O& ^* V8 q9 F A5 v$ o2 f - if (fp == NULL) 3 V( `8 t0 ?2 {. w; W' W2 M
- { & B% b( o, \( `' ?5 I4 K
- printf("File:\t%s Can Not Open To Write!\n", file_name); 4 B0 R9 n* }& r1 t
- exit(1); 9 t. e* l5 P' @% q
- }
; I8 d$ `2 [# B( o. q* N( y
# s9 U/ f, ?0 M0 |* t, |- // 从服务器端接收数据到buffer中 ' e* h; y) F( j: Q4 @- E
- bzero(buffer, sizeof(buffer));
t( _- {+ G" i: S - int length = 0; - l8 p, b# k- Q$ _2 U
- while(length = recv(client_socket, buffer, BUFFER_SIZE, 0)) + [" y) e7 `$ E
- { % U H4 p6 W& b3 x/ j m8 z
- if (length < 0)
1 o6 \( j+ {! k) T - { % R+ v3 Q( c1 T- H
- printf("Recieve Data From Server %s Failed!\n", argv[1]); 9 B/ k9 c7 P' d
- break;
/ j1 u% W3 z7 A* Q - } 1 }" s8 H% x9 B$ Q1 F& J
8 D0 Z+ z! D7 L! O9 |) M- int write_length = fwrite(buffer, sizeof(char), length, fp);
2 w. Q2 S: `6 Z$ H2 Q2 N, c - if (write_length < length) 4 u Z" G& U# N: ^2 K
- {
6 m9 U2 w) |6 K. S - printf("File:\t%s Write Failed!\n", file_name);
# v$ f5 y5 n5 O4 r! q' C- U; _6 T0 | - break; 3 ]* }& X6 r: ?( H, L( y
- } 8 N* q8 X! |) r8 x! R6 L7 Z& `- T
- bzero(buffer, BUFFER_SIZE); 3 e0 `0 x4 M/ V( M- [3 j: Q$ w
- }
/ Z& L/ @! B) _- T# q. d! g/ ~ } - 4 B9 h d$ i& l4 N' x! w" w! X' l
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]); 1 O6 g- P+ }* i2 G9 ]
- $ }$ f1 H3 R8 [8 x0 i+ p2 E6 u; o
- // 传输完毕,关闭socket
( H( ]2 ]' k" v4 a j" Z - fclose(fp);
) |6 V) X, {+ n8 r2 e% ` - close(client_socket); ; k% \* g" }1 W. Q- w7 P. H8 J
- return 0; 3 ?* c7 w9 s' u8 q
- % o' B) B6 P. F* g
- } . G! m) P! z! E0 f( H# Z, l
% i$ L: d O; X8 P
复制代码- /*server.c*/+ i0 l7 J. X; J; o: `5 D
- #include<netinet/in.h># c; v% E4 z3 f" q# H! n1 U
- #include<sys/types.h>% I; Y4 n1 w5 J3 n0 P
- #include<sys/socket.h>+ M4 j, e$ S0 E5 t' \; {
- #include<stdio.h>
a+ k" z9 O& o$ r, P3 y - #include<stdlib.h>4 e2 s2 Q: T3 r
- #include<string.h>2 S9 {, d& x/ f" v% \- O- ?
6 z! a; s: C5 |. `6 A# F/ z2 W' u5 Y- #define HELLO_WORLD_SERVER_PORT 6666 //端口号: V+ Z( e0 y3 o: A& ` r
- #define LENGTH_OF_LISTEN_QUEUE 20
1 x7 z2 _7 P- S, { - #define BUFFER_SIZE 1024# \( a, U2 C8 q* _+ p7 _. h) H
- #define FILE_NAME_MAX_SIZE 512
6 g- _, o$ f# ^) \
% c" Q s0 q; K j7 B- int main(int argc, char **argv)$ d& f" F9 c" G
- {
5 O) J; e+ |/ a3 K- m% F - // set socket's address information$ t# q1 [6 T6 _, \5 R+ y6 S5 }
- // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口3 L2 K1 `1 d3 J3 x
- struct sockaddr_in server_addr;3 e4 Z$ r/ H* ]# j {
- bzero(&server_addr, sizeof(server_addr));( v& |$ C& s% i5 i8 P
- server_addr.sin_family = AF_INET;6 I9 p, v3 Q1 `
- server_addr.sin_addr.s_addr = htons(INADDR_ANY);
, u$ c. `% c% ]3 y - server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);, r( w+ L& x- w+ [" G
w+ J5 Y$ s$ {9 O; A- // create a stream socket
+ s& j, U: ?) F; |! n1 f% L - // 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
$ t- f8 m# m4 @/ L) Z. Z: ^' A - int server_socket = socket(PF_INET, SOCK_STREAM, 0);
$ u3 T. v3 A) ]1 c3 [ - if (server_socket < 0), U. j% [9 j. v& |1 Y- x2 z
- {6 L0 a& i9 ~/ F
- printf("Create Socket Failed!\n");
/ [/ J4 Q& S1 m8 B9 J - exit(1);
2 Z: B1 P8 K: V1 ~4 g( v - }0 p' }' e" w4 `9 |2 [$ W m
4 d, J- x; I+ ~1 ]( T, h4 V- // 把socket和socket地址结构绑定
8 g: w: F5 d0 {# N - if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
* y, K( U9 F8 C& G - {
2 n- ?: `9 q/ S; @ - printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);
2 u& N* e9 b- p. R6 ^ - exit(1);* S7 G& B3 R9 S: H6 E' j
- }' {# Q X+ a- E) ?
6 L/ ]$ w0 Z' E4 A- // server_socket用于监听# s- ^- d0 q* F) W
- if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))4 C$ ]5 J2 T9 p" z
- {
/ z$ d, ^9 K: N' l K6 _$ y - printf("Server Listen Failed!\n");
- t+ N+ s( L/ X3 F/ r& t4 X; [0 a: w, H - exit(1);
% t l2 d. |* h- K- s6 D. ^: _; G - }
% ?, Z3 A# T) M# S% |0 r
+ w( _' D4 D- J' O- // 服务器端一直运行用以持续为客户端提供服务
, N& b' @) d3 l& j! N; [0 ` - while(1) u: F) K( {3 q
- {- k b; S3 Z3 I- o9 ?2 h
- // 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accept4 L( M" W% O$ Q) D/ y8 e
- // 接受此请求,同时将client端的地址和端口等信息写入client_addr中& q, C* t$ d0 R1 X7 q4 F
- struct sockaddr_in client_addr;( G7 K6 _' Y3 R6 s5 H3 ^& g
- socklen_t length = sizeof(client_addr);
7 y0 i, R) s5 a7 a# I
' |6 ]7 t( d1 b$ e7 p7 m7 b- // 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
6 i9 e. n' l4 V - // 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4 v6 D6 H% @# D3 z2 S! D5 p7 s# {
- // 用select()来实现超时检测
6 l' o( N: b9 w8 h/ i! A% T/ U- c - // 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
1 O) ^: M }( ~( a, Q3 g) y - // 这里的new_server_socket代表了这个通信通道# C: }0 b( q* u$ s# m* }' Q" H* j
- int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);" W+ E$ }$ u$ [5 t8 O' ]
- if (new_server_socket < 0)5 d3 i8 @4 u: ~: z7 T) W6 B
- {
/ x' T0 K) L6 i - printf("Server Accept Failed!\n");
# T# U. i( }5 Y3 z - break;
" B8 a: s3 J- W4 y6 E - }
R T F/ a3 U9 U, R. c, d - : N1 Z6 G6 V* X `" D
- char buffer[BUFFER_SIZE];8 @; q9 v3 [3 g: f
- bzero(buffer, sizeof(buffer)); F5 Z% s) w8 P% s
- length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);7 _' c" @& b8 e( A
- if (length < 0)
; f9 o3 V5 U7 c3 i* @% F - {7 K' q9 t/ h7 h) R
- printf("Server Recieve Data Failed!\n");
3 o/ p5 K4 A% f& ?4 I) P1 D+ D - break;
, ]) r' z: \3 u8 W8 { - }5 c) Q$ F% j( \
( q+ @( x4 t- |2 f, O. M6 K& L5 t* j- char file_name[FILE_NAME_MAX_SIZE + 1];
# Q& r5 }& o/ m* [ - bzero(file_name, sizeof(file_name));
' ^0 Q9 j9 `; A u2 J$ P - strncpy(file_name, buffer,
6 a+ G0 g6 J) i2 S- j8 {8 i' o - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));: z: z5 f1 J; ^% I. _
- 5 F- L* k p3 N3 J5 T
- FILE *fp = fopen(file_name, "r");- _. F! M' E: I% {
- if (fp == NULL); y: s- B, M+ T7 G3 `/ ` k
- {3 e; N1 q$ D& w* i# U
- printf("File:\t%s Not Found!\n", file_name);
+ D: b$ Y' S) v, \ - }
' b( d+ ?2 M# u - else
7 r. @) z5 [4 u9 R+ ] h( m# a - {
# n" Z8 A5 c. }% T* t - bzero(buffer, BUFFER_SIZE);3 l# {% \' D* k2 c/ J/ |9 B; Z
- int file_block_length = 0;0 L3 v. n X+ A
- while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)1 W+ f. z7 N% o' q" ?
- {
0 t8 N0 x& ^; T1 w+ {- a3 A& O - printf("file_block_length = %d\n", file_block_length);
# N% y& ?" i5 L' U0 c& v
& N' ?# K2 `& M2 T- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端- ^4 l) J7 A \% o$ L2 S5 i! b# A8 l
- if (send(new_server_socket, buffer, file_block_length, 0) < 0)( t/ k* ^# y. ?9 d
- {
9 B! l, c9 b; m3 ]& F" U - printf("Send File:\t%s Failed!\n", file_name);/ `! h8 ?& E. P5 `
- break;
7 i2 {( y% \( j5 i( z - }
* X% k% K$ r8 D, ?4 c6 ?
% e8 G" b9 F2 x1 a$ d7 ~$ N- bzero(buffer, sizeof(buffer));* G: H% D' d3 ]& B2 _
- }
6 C- r+ l$ W' ]6 M2 Y - fclose(fp);
$ g! }: M9 P6 C; T - printf("File:\t%s Transfer Finished!\n", file_name);4 G8 x9 T# g1 b% C
- }
0 {. |: h0 ]! n; M9 A ] - : k7 Z3 J7 \* v9 r% r8 i
- close(new_server_socket);% r1 M- a0 @& t6 W- r' U
- }
1 `- r* r3 u7 f/ ], N - + }! c) R. Z! b% V
- close(server_socket);
+ e) q2 t) u# w5 c5 ~ - : i6 U4 W2 J: d0 m
- return 0;8 @3 P+ Z$ {# t; X9 Y
- }4 b5 c! n" s4 O4 n
- ( `# C! i5 r, d0 f* e% r
复制代码 # o6 e8 J% J' B: M$ N. J
% i: R+ ^# @9 S0 k) b0 z3 d+ R9 T8 Q' V* n, j( P1 @! F s
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