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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。6 w$ E& m l0 O# L" p5 r8 Z
(1)客户端程序,编写一个文件client.c,内容如下:
: t* p4 I2 R" q$ O0 {" p* ?' B- #include <stdlib.h>
* j- t, n3 c. @# }, u - #include <stdio.h>! D( e @. ?/ h/ e7 Q
- #include <unistd.h>
N" B, L* c' V - #include <string.h>+ W X$ D/ p. s
- #include <sys/types.h> V' b2 Q( {3 _3 ^" k
- #include <sys/socket.h>
$ x/ I% z6 k1 y) _; t Q$ o! j - #include <netinet/in.h>
8 c2 x# w- n3 B' Q$ m ` - #include <netdb.h> /* netdb is necessary for struct hostent */) W$ q/ L$ M1 k: s) s4 X
* f, Y# }' ^5 B4 H% G7 c" g+ Y) }/ g- #define PORT 4321 /* server port */, t* n- X2 H: o0 L+ L8 A$ l
4 s+ p; \0 O& D& m4 t% ~- #define MAXDATASIZE 100+ M0 v, ]8 V X8 A* q
- ; o# c; ~ g# N* ~" B* m. o$ z8 s( ~
- int main(int argc, char *argv[])
, T: D: _7 W3 i" D( i1 v# h8 c - {" H1 b) S- U7 d% @: a6 K! D2 g
- int sockfd, num; /* files descriptors */$ T' ?! G6 J H8 N7 D# B( Z' H
- char buf[MAXDATASIZE]; /* buf will store received text */
2 C+ q% `" a8 U1 A - struct hostent *he; /* structure that will get information about remote host */3 C2 W/ l7 |5 E
- struct sockaddr_in server;1 y5 X) c7 U" H4 ]
- - Z% u; M$ i% @; ?/ Z
- if (argc != 2)0 Z- W$ d* ~* b" ~' D9 X* N$ \
- {, Q" ?! V2 z) k
- printf("Usage: %s <IP Address>\n",argv[0]);" e3 s' L4 [! x& G R! N
- exit(1);& d6 s; g) T) p) H
- }% w4 Y9 H' u: a }* {6 [- s$ k
- : h1 k( j+ B5 C7 S2 J. b3 a
- if((he=gethostbyname(argv[1]))==NULL)
9 M! z0 N& p# a - {4 \ ^2 D' g6 N) ~0 E) w
- printf("gethostbyname() error\n");
$ l4 w, }2 Z3 ?' {3 b( x - exit(1);2 d/ D6 E5 D0 H4 }
- }% m8 {# V% y/ O' l$ O% `3 o- C$ @
- ( k; V/ ^2 Q7 k/ g
- if((sockfd=socket(AF_INET,SOCK_STREAM, 0))==-1)& H# f1 N2 N$ O6 N2 ^
- {
5 \5 D$ f. m0 [ - printf("socket() error\n");' O& M* k) K2 g4 ?
- exit(1);& K* c }& V3 ]: j# D" _) C
- }
G9 Z( A9 [3 F' U - bzero(&server,sizeof(server));
: ^! _3 ], z2 ]& l; x- d! G+ x - server.sin_family = AF_INET;$ G0 D# i# A S) y
- server.sin_port = htons(PORT);0 N3 M5 o5 _2 @. a7 x- Y
- server.sin_addr = *((struct in_addr *)he->h_addr);
& U9 t) [6 d6 A! I, Z8 [ - if(connect(sockfd, (struct sockaddr *)&server, sizeof(server))==-1)
2 W: g, B5 |+ {, x - {
( ~5 [4 i1 I3 x4 G5 Q# r" | - printf("connect() error\n");9 P* }6 ^; L6 ^' w3 N2 ~
- exit(1);
! O& z# `) X% u7 ~ - }
- A" U! A/ {, i3 G, [ - ' p3 ^. Z d$ z1 W! d0 Q7 e8 \
- char str[] = "horst\n"( `: j9 q9 c9 e/ K7 d
- ; w# G$ F" i2 p: O
- if((num=send(sockfd,str,sizeof(str),0))==-1){4 |0 a8 y/ \; T5 S* [: P" m2 p
- printf("send() error\n");
' M) R: v" `% J" e& E$ ~ - exit(1);% p/ B9 E* H+ f# M2 r8 v: V
- }
9 \; C7 |8 O3 X \( `* y! a5 W( Z, x/ A+ S - if((num=recv(sockfd,buf,MAXDATASIZE,0))==-1)& a t) B* ]& W% e
- {
0 p7 y% E% i: t& v; f, [ - printf("recv() error\n");
$ M( D# _9 z: h+ b: H; h - exit(1);
) W' s" v) c$ G' \ - }
( L$ N6 h) W% V: P2 S# d! ] - buf[num-1]='\0';
5 Z; o+ D# f* A+ N8 P2 U - printf("server message: %s\n",buf);
1 m, d& R, @7 {- O - close(sockfd);
$ }3 K! _/ U) r - return 0;/ D" b5 l+ P, z; X$ S5 h c
- }
复制代码 (2)服务器端,编写server.c,内容如下
2 ?/ K- d) J; X& E. P% z- #include <sys/time.h>; R. k3 c- ?$ L X
- #include <stdlib.h>) Y+ C R/ y U# Q/ g
- #include <stdio.h>
3 a( m0 o, ~, N6 D' t1 L, k - #include <string.h>$ M8 f/ b: B+ Z! f( t+ v
- #include <unistd.h>
8 X4 w0 C/ x0 }. H8 y - #include <sys/types.h>
+ A- k+ o6 ~5 W( t% |# }9 m# T% A - #include <sys/socket.h>
% E8 @( }0 [+ }" S - #include <netinet/in.h>$ F( W- v/ n# B1 P5 `* ]1 Q
- #include <arpa/inet.h>
7 }3 J! k; y! d. o$ a' X - 8 i* G4 K9 T% f! O3 y$ C# r7 j
- #define PORT 4321& |9 o4 u& p% A; i! R2 P/ `
- [0 i: ]* C4 h2 _% G+ K: P& Y# i
- #define BACKLOG 19 l& p3 o# T1 N4 |
- #define MAXRECVLEN 1024
. Y) Q c3 I- n ]* O" j5 O
; n [. h; p3 }: F" w( c- int main(int argc, char *argv[])7 i5 D/ b; N$ a( a5 {" ]! y
- { b* _( E, |4 w0 X9 A) F
- char buf[MAXRECVLEN];! I: a* I# w% M5 U
- int listenfd, connectfd; /* socket descriptors */! _& u$ I! \! ^4 n0 a. g# y8 g
- struct sockaddr_in server; /* server's address information */
: w. ?* P5 S4 y - struct sockaddr_in client; /* client's address information */# A& f2 j- Q: A9 h2 _$ e
- socklen_t addrlen;' k; Y" X; Y, }9 c# D7 d" A, r
- /* Create TCP socket */' B0 l% F9 G; j$ V5 U
- if ((listenfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
~* R3 z! y' H: _4 d9 j1 q5 I) B3 s - {
9 q. N( P3 w: B( h& w - /* handle exception */4 N; C- b" E/ Q5 E
- perror("socket() error. Failed to initiate a socket");
" U! E) c8 r8 }! H - exit(1);/ k9 m8 M3 {; o/ w2 ?
- }
- z( ~# a: b3 N+ f/ Q+ V4 D -
; |' c8 j( s; R1 N* s - /* set socket option */
4 _. u$ N$ g J' T( ?4 G8 F5 M2 e - int opt = SO_REUSEADDR;
: K% o2 L1 H: J( h - setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));5 e& v2 _* R8 u( r
/ v7 i, }: E1 k5 i8 L- D- bzero(&server, sizeof(server));
6 v- Y8 r; h9 f
) N* k: e. w' w+ z& r: u- server.sin_family = AF_INET;: q/ k' t+ [- |3 Y5 G% t7 l& x: t p* e
- server.sin_port = htons(PORT);. `& x# G/ ^8 S* c" F' f) J
- server.sin_addr.s_addr = htonl(INADDR_ANY);0 g* w, }; D6 z9 P
- if(bind(listenfd, (struct sockaddr *)&server, sizeof(server)) == -1)9 q3 T a# B6 T/ R
- {
+ r5 K6 R7 q# E) i& {! U - /* handle exception */
+ h# a+ k7 V# k) O - perror("Bind() error.");8 L0 @3 c( _7 |) ?
- exit(1);
/ d8 @: o" L, X" w% ` - }
& E" |7 Z- o/ h -
( M3 U0 _) l+ x* f; i3 D6 O - if(listen(listenfd, BACKLOG) == -1)
, l! M, r* _9 x3 b; p - {
/ H/ j/ }9 K& {. K. e/ c" }) } - perror("listen() error. \n");
" r# I! b1 h% Z9 T3 ?' W - exit(1);- h+ A, T% D7 t, T e' [# N
- }
1 K( t2 W1 ~+ _ - ! E& o$ ]9 v2 y' J. X' b- g. \
- addrlen = sizeof(client);
5 Y ^6 x& J$ U, M; A0 m - while(1){' @+ f* [* s4 M. N
- if((connectfd=accept(listenfd,(struct sockaddr *)&client, &addrlen))==-1)/ q. [& Q n2 E
- {
/ O3 H: q3 Z& R' H: O7 }" | - perror("accept() error. \n");
, Q, h! t' e) g o( a, r" b - exit(1);# t* ~% k( ^+ a% \3 p
- }
p! u! b5 t9 P/ Q# |. ^
* h% |) [# _/ Z, g! K- struct timeval tv;
6 q# z4 k3 r6 f7 s - gettimeofday(&tv, NULL);! ^6 v* L% P) L- s- M
- 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);$ h4 h" z5 G) J* Z
- # o. b! y2 E7 p( r8 D
- int iret=-1;6 m3 D7 [/ U- U! \* ]# ~
- while(1)3 e) k( v8 b3 M2 ]# @# W- X
- {, Y! K- E3 Y, R9 |3 @( h
- iret = recv(connectfd, buf, MAXRECVLEN, 0);
" c, H! G4 U |) G - if(iret>0)
! I, ]7 j) v+ X# `3 g, \, i - {, |% s5 O( \3 e% s
- printf("%s\n", buf);
9 |& X/ k2 ]1 u- |1 p& E9 J - }else! r) w B" k& y. M) T/ {9 R% D
- {
* r7 |. e; A& C+ `; ? - close(connectfd);. F6 Y/ n, P5 x$ }8 D# E) P
- break;8 g V8 o+ I4 [3 ] X
- }
8 c* X: s$ o- R7 t& d% H - /* print client's ip and port */
9 a( M) ]7 o' o3 p( S - send(connectfd, buf, iret, 0); /* send to the client welcome message */
, P& y' W. f" X7 G - }
% m" Q* j2 |: G/ T# _. Q1 i - }2 V8 m0 E+ Y* b4 e
- close(listenfd); /* close listenfd */" f+ w& Y* e! r, S
- return 0;
$ C4 D- q3 [! g4 ~. t4 x6 h$ G* v - }
复制代码 X' B l! d4 v8 g! E3 X5 E R* ?: ~
; T7 B z3 o( d+ n+ I& ~
(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
0 K7 h! h3 O8 @7 l- X
0 }8 x& o$ e4 W; h: f- server message:horst
复制代码 6 M' ^, T% ?1 } f; _9 [
服务器端:
- $./server
% B# q" e) j+ v A2 Q - you got a connection from client`s ip 127.0.0.1, port 60865 at time 1418281267.643428
复制代码本程序客户端会自动退出,服务器不会,因此如果想停掉服务器程序,直接在命令行界面按键盘Ctrl+C停止。
程序实现的功能很简单,就是服务器监听4321端口,客户端与之建立TCP连接后,再发送字符串“horst\n”到服务端,服务端打印出来,然后再把字符串传回给客户端,客户端再打印出来。然后客户端关闭连接退出,而服务端继续监听4321端口等待下一次连接。
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作者: admin 时间: 2020-5-9 01:48
服务端启动,客户端通过ip地址连接服务端,然后输入要发送的文件名,发送文件到服务段.
5 f! q1 h! }3 k z* C* G% |; M- /*client.c*/
1 T4 H0 T" V1 m6 \& i3 P - #include<netinet/in.h> // for sockaddr_in
0 n( g8 Z3 t# ?0 l - #include<sys/types.h> // for socket
* k$ {/ N( S$ z7 e6 h# C3 l1 K - #include<sys/socket.h> // for socket
% o3 }7 a/ t: I% v( f+ i' k - #include<stdio.h> // for printf
+ t5 k4 i- m8 L2 [- y - #include<stdlib.h> // for exit ) u" h/ |: N6 U: F! R0 l f- s
- #include<string.h> // for bzero
1 {, O/ M: F: d) u+ o3 V0 K5 y6 Z8 A - 2 s: e+ J f$ S8 ~; d2 r
- #define HELLO_WORLD_SERVER_PORT 6666 7 A4 G0 f0 U( A1 W0 b) V. n9 w
- #define BUFFER_SIZE 1024
& M" U# N. L% V+ u+ X - #define FILE_NAME_MAX_SIZE 512
% G1 X/ S9 q- u# f - % _! n' Y' q9 |: h
- int main(int argc, char **argv) , ]/ f, U6 U* ?: X
- {
* O2 Y- P5 k' l9 P, i1 B# k( ~ - if (argc != 2) & ]& O& O9 q& k% A# ~7 r! J, }
- {
% z" I9 c$ b+ j; X4 ]0 b+ n - printf("Usage: ./%s ServerIPAddress\n", argv[0]);
8 Z' d# O+ H1 P1 _7 j2 J3 k# P - exit(1); + G6 u/ `# O7 k* `7 Z+ T, ^
- } , F" _8 x G1 W' W1 u6 ~$ L F! p
- N/ D8 C! G. ~6 x- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
- [$ [$ k0 u6 P* W! Y - struct sockaddr_in client_addr; . ^5 Q1 {/ V3 X o
- bzero(&client_addr, sizeof(client_addr));
3 C0 V% j1 S5 {( l - client_addr.sin_family = AF_INET; // internet协议族
* Y* h+ ^( ]+ _6 Y6 _& |4 F/ A/ s - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址 4 T6 q8 H, a0 y z( X" g$ O
- client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口
/ l- d5 E* D2 j. F - 1 h5 m- S6 Y! W2 ^5 G
- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket 6 ] g9 |8 G" Q* H/ K. {' D9 n
- int client_socket = socket(AF_INET, SOCK_STREAM, 0); . F1 K7 w1 E; P D; C
- if (client_socket < 0) ! h2 n& ?5 u6 D* S
- {
) G5 y3 D/ H1 R" l, @+ i4 S6 y0 { - printf("Create Socket Failed!\n"); % g3 Q: e7 }3 b$ `7 i' _8 v* N
- exit(1);
& y- h0 D8 N6 U' V - }
% [! F, h. ^% q7 ?, @. n! M) ?" @ - + J8 C: L% q1 |; r
- // 把客户端的socket和客户端的socket地址结构绑定
' R8 H7 ? \! ^ - if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))
/ L5 Z1 T( G- S+ f( ] - {
; J5 _& x% g8 D" E( q5 z4 s - printf("Client Bind Port Failed!\n"); * W) U: u- U0 F% O* E! [; o3 U
- exit(1); + ]8 [9 ^' m0 i& n! ^
- } : Y' J$ b! W- T
- 6 I( e6 G* `" y% E5 O, h% v
- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口 ! z3 h1 g! W. e8 B7 [4 w
- struct sockaddr_in server_addr; k7 a: |' [! c5 s
- bzero(&server_addr, sizeof(server_addr));
( I. M2 @/ s$ T - server_addr.sin_family = AF_INET; ) }) x( o5 A$ e8 D3 y0 G
; Y+ o* W# C8 }$ d) T7 I- // 服务器的IP地址来自程序的参数
1 n0 G" O2 I& L. Z+ _ - if (inet_aton(argv[1], &server_addr.sin_addr) == 0)
$ x: _: Y( P/ w4 t0 B: W, s, m - {
! l6 W8 O! ?" {4 w, }# f - printf("Server IP Address Error!\n");
4 N8 v1 t+ N9 c2 z - exit(1); # m& T( \8 ?- A7 ^
- } 9 A# c2 {0 ]8 h: g8 V1 ~2 Y1 E. J
- * \8 z9 K5 i1 `6 M9 V; A+ _
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); $ V0 C" G$ v+ V' l; ~8 m0 j Z4 l
- socklen_t server_addr_length = sizeof(server_addr);
+ i$ i5 a0 r' }8 \2 ?+ x/ \ - % E- n+ j7 ^, c" m9 _( } G
- // 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 q. A3 Z* B4 {5 c
- if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
+ X. _* {! S/ \1 |1 t - { # ^$ ?1 B+ X6 d' A
- printf("Can Not Connect To %s!\n", argv[1]); }% h; _4 @8 g
- exit(1); 4 x1 c2 y1 X: n3 D" j
- } 2 E1 ?2 m. D! z0 _! V
8 H) t$ G& Z2 ?$ W- char file_name[FILE_NAME_MAX_SIZE + 1];
$ c$ u, {. P Y1 [ q - bzero(file_name, sizeof(file_name)); 8 R r7 A. `1 I1 |% N0 s
- printf("Please Input File Name On Server.\t"); . h; Y4 e6 Q m0 K
- scanf("%s", file_name); 1 s' H: K. a6 v/ H2 Z
- 4 l ^# k0 J# [/ ^/ C* k! v
- char buffer[BUFFER_SIZE]; & s; U( W; q( n3 L/ _
- bzero(buffer, sizeof(buffer));
6 p2 J, q) ~; r: @/ |# x - strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name)); ! k. E( b8 R% X0 c$ O0 Q
- // 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
, d5 g1 |2 ~# s7 i - send(client_socket, buffer, BUFFER_SIZE, 0);
4 P) N9 x Z' K2 k* s, \$ D - % {5 a$ ]+ s# E% {1 V
- FILE *fp = fopen(file_name, "w");
) I! S0 l2 m; z e" a) V% k; w6 Y - if (fp == NULL) ( g% B, I5 o) g6 ^
- { 3 k+ m) {5 x: Z( v6 m2 }/ w: \
- printf("File:\t%s Can Not Open To Write!\n", file_name);
* n2 H q) N# z {+ Q/ \, l - exit(1); 3 u. X: ^- H! Q0 E B5 ^$ j
- }
9 V* a9 I2 R1 @( i0 h
: ~/ u. H, K% \9 C% [- // 从服务器端接收数据到buffer中 ' b# _& X( f5 v! B7 t4 c
- bzero(buffer, sizeof(buffer));
. F1 p, N, S' C! r% a3 w) y - int length = 0; + k h$ Q& Q/ J! `
- while(length = recv(client_socket, buffer, BUFFER_SIZE, 0)) 2 g. \6 m# Z J
- { 7 r8 c2 {7 m; s
- if (length < 0) 8 K' ]% s& ^+ h8 L) o
- { 5 n* ~$ m4 H1 T# p; Z, j! n0 o
- printf("Recieve Data From Server %s Failed!\n", argv[1]); . k1 |# x9 y7 ^
- break;
* t% q" d+ ^* f- z# Y* t" m4 i7 k - } 5 I( F4 f* ?9 V! f; k" F& h2 J
8 P @6 o+ E/ c% w z9 G2 V( ~# q- int write_length = fwrite(buffer, sizeof(char), length, fp);
: b0 E; o4 N6 T p4 f/ W - if (write_length < length) ; y% |8 p- b% q8 I+ e; d
- { ) d' N" B% p% W$ k: e+ _
- printf("File:\t%s Write Failed!\n", file_name); - ~5 }' b, \5 Z5 _& G% N* e
- break; ' I( r$ Q7 s6 f
- }
) Y3 {( t3 n# {- b( C. t2 M7 ~ - bzero(buffer, BUFFER_SIZE); 4 y5 Q- u9 P+ Q4 ]' \; P
- }
; K* _( x. \ _- A$ ~: _9 l
2 L. }) b% ]& Q0 a7 j: I- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]);
: W6 U2 W$ w5 a6 @0 c
! }+ m$ M8 i" m2 O& a5 ?) L' W3 p- // 传输完毕,关闭socket
* n5 {3 ~/ q5 G" V* v! O* ^ u - fclose(fp);
7 j. _7 d8 H1 t$ e) X( D& s5 R - close(client_socket); 5 M6 k5 s* S: u0 K) Y5 l2 r, K; c3 s
- return 0; 9 u$ V. K6 ~+ r
- $ B6 h" K, q M3 T. o& C) E# j% B
- } $ Z7 l- {" i2 B
' [) x0 N) w+ F! |8 b( l# Z' |1 X; G' o
复制代码- /*server.c*/
: o# n, D; Y# {5 `6 x& Y - #include<netinet/in.h>
( p" G5 o, y$ U+ A2 E R/ w - #include<sys/types.h>
1 _4 U' G5 O3 j" Q - #include<sys/socket.h>! G; [2 }/ L3 X* l0 m
- #include<stdio.h>+ L# h6 B9 z; _- m3 g9 [
- #include<stdlib.h>
# \6 m/ w3 ^( J6 D - #include<string.h>; v2 p' E$ X2 f# T3 A4 h( D% E
% y9 t; @7 j9 J( x7 `- #define HELLO_WORLD_SERVER_PORT 6666 //端口号' }% y7 i9 F- J! E0 g6 ^! Q w
- #define LENGTH_OF_LISTEN_QUEUE 20$ v( }6 g+ i8 d* n T: \ e
- #define BUFFER_SIZE 1024# M( F/ X$ A: {" A+ P- t5 ]
- #define FILE_NAME_MAX_SIZE 5125 ^0 p' T, o! U
- 4 F7 Z) E+ h& {5 A3 Y) p
- int main(int argc, char **argv). q$ o' \- x5 g0 H
- {
: X8 B) s. @, A - // set socket's address information8 `% ^' O2 T" |7 W; v' S
- // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
2 V4 u' C3 c+ ?3 o, {& C/ n - struct sockaddr_in server_addr;
4 l, K/ I" s6 T2 u - bzero(&server_addr, sizeof(server_addr));" P2 }, J8 @. S/ \2 r& O$ |
- server_addr.sin_family = AF_INET;( |4 T3 c- [, A; h
- server_addr.sin_addr.s_addr = htons(INADDR_ANY);
' S3 z, r. _+ f! Z - server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
+ g8 B& k; F; l/ A* L( g - 0 P' S9 u0 F" i" S7 a. a
- // create a stream socket& ?( T& g4 S! k `/ m2 d4 v3 m& f
- // 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
. E# }( R6 C% G* P9 T - int server_socket = socket(PF_INET, SOCK_STREAM, 0);. n# U6 `, f' l. P% W" p4 e; c
- if (server_socket < 0)
, a7 {9 X0 m" R" X- X% ~/ ~ - {- S4 O1 w- m9 V
- printf("Create Socket Failed!\n"); o- v5 W. V( |2 w1 W/ z+ s
- exit(1);
- l2 |+ J3 K! l. m5 k7 P# k$ w6 |) K - }
V6 K8 R6 K2 G% `# m! q2 V9 u
& J1 c' g. g# d! Z' A# b! J0 b- // 把socket和socket地址结构绑定- e; i5 ]2 z- P
- if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
' s2 Z$ @: o7 d G; C2 d3 E5 }+ { - {
! j" r$ k% a3 b" C& _$ w; v/ V - printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT); x4 k6 w0 L0 N# x0 G r4 o
- exit(1);( T! a0 X# A" z: [+ F
- }
$ t- i" m; ~# Y' j; f; b
- z& a. n* ~1 ^* E8 M8 z' t- // server_socket用于监听* g7 [; Q% T0 g0 E3 I
- if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
( N! {. H, ?7 ~! n* A - {7 T0 D P1 A) D0 o6 S
- printf("Server Listen Failed!\n");/ t# F& G- P: q& Q- o# H
- exit(1);
" K3 |! d/ J4 P) N2 A3 j- d - }3 m/ m( g! c$ D8 L/ J. o
4 r4 M/ o- R! Z6 B/ J- // 服务器端一直运行用以持续为客户端提供服务
4 K& Z/ E. v4 j6 O - while(1)/ t3 a2 G& Q. V y
- {% W7 A8 h* V' h3 U' p t6 X+ ^# 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accept" o5 u% Z: C6 e& K0 X6 N
- // 接受此请求,同时将client端的地址和端口等信息写入client_addr中+ _/ N* N+ D' p
- struct sockaddr_in client_addr;6 A( @: h; N0 u
- socklen_t length = sizeof(client_addr);
# j3 K0 M1 n9 l - " h. l" c0 a" I5 p' U
- // 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
: q: L! Y S. ^: ^8 B - // 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
; j. M* U# d( L$ U# U - // 用select()来实现超时检测' K) \; O* C# _# J8 ~; i9 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$ x! N+ V. C H
- // 这里的new_server_socket代表了这个通信通道
& [) a: }& S: I% g- }/ [/ m - int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);( b( G/ q6 A9 t* L( }4 X, u
- if (new_server_socket < 0)2 \! m% N6 S) w0 u* g( _/ x
- {
/ `7 H: {% g0 n - printf("Server Accept Failed!\n");
$ A+ {& K( c* {! r7 M - break;
2 E$ q. A) P, Y: m - }+ |. _3 i- ]8 j8 n) s% |% U
- * A" E$ z6 j* T! ^- f! b" A$ u
- char buffer[BUFFER_SIZE];6 L" J1 s3 y, R8 e$ V! j k! c& c
- bzero(buffer, sizeof(buffer));
! Q @; i- V& \& F+ W - length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);
/ \- J i5 W; ?& | - if (length < 0)
' v. j, e5 ^& Y' Z+ b - {9 ^$ _. D! J! B/ W0 W
- printf("Server Recieve Data Failed!\n");
# _+ ]* T+ y) Z$ Q* w; w" G - break;) j( R' O Y: n9 ]: `
- }
4 F& D: R, b" L M/ D
3 |7 \5 b/ W0 `$ k8 {& ~( p- char file_name[FILE_NAME_MAX_SIZE + 1];
) _ a- u+ X, g$ N( l7 R - bzero(file_name, sizeof(file_name));# F9 t2 K" | H `* F
- strncpy(file_name, buffer,, J7 m, [' H; I$ z9 H3 k+ Q8 S0 U0 S
- strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));( Q8 @) A% ~5 t& ^% @
4 e" _7 K) D$ k- FILE *fp = fopen(file_name, "r");
/ Q r' k9 `2 m - if (fp == NULL)
: O! J5 K1 P1 i4 U% S - { P1 K% @9 x' q* f" J! X
- printf("File:\t%s Not Found!\n", file_name);
( M' A+ l# w5 _0 w# o& u% V - }: _; B) \* d. A/ Q- Y# m
- else
( \9 @0 D$ u& F D - {& S4 [% j0 T8 s5 B- A+ ]* ~+ }7 N7 E
- bzero(buffer, BUFFER_SIZE);
- l0 E+ ?4 y, l - int file_block_length = 0;
z7 o7 X5 }2 ?1 ] - while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0) v3 G" Z" @7 U& Y2 l$ Q" K
- {
7 |! K- M% ^3 ]% i% B - printf("file_block_length = %d\n", file_block_length);
) b* G1 ^7 a7 c
# j, K* D, w1 v+ o( O+ N/ x5 {- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端' ] L$ L; C/ l( q! U7 A
- if (send(new_server_socket, buffer, file_block_length, 0) < 0)# }. ]* I, k& ~$ m/ d4 B
- {
, \& b, f, d& @8 A! R9 y. J; l - printf("Send File:\t%s Failed!\n", file_name);; c- Q' \& k+ _9 R! E% O) i* D
- break;: e6 K, U( Y1 b. ]7 X
- }
. V4 Q& c# q7 h' b7 k4 W% E - . y# C# m, K S' W! G3 Y* u. i
- bzero(buffer, sizeof(buffer));8 d; i# v' s4 Y$ C- U
- }
% l3 L# Q8 C! h. O' k- w0 z0 X6 H - fclose(fp);: w B7 h0 B f: t y
- printf("File:\t%s Transfer Finished!\n", file_name);
. E8 A* V8 d* U( X - }( L c9 h# z7 G: L: A
+ D+ o1 [$ y8 p( V5 d1 _& o- close(new_server_socket);
; A, k6 ^9 X3 J- A" I - }7 T( W) S& N4 ~2 T- ?/ n
$ Q( g: ^# z6 e5 n- close(server_socket);" K# r; b" b# g; T5 p, c. [ Z
5 }7 R3 y* \( H* T- return 0;! X9 L$ z) ]2 k# R) `4 v* C
- }
; z1 h, N# i/ }% {4 J+ z2 f8 e - 4 U* b# [6 }& M& c' E
复制代码 6 r! J1 L1 i* ]. K8 N
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