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发表于 2020-5-9 01:48:09
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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 J% d6 C6 g: W" P j- /*client.c*/
$ p5 m: e; R5 q; }: e - #include<netinet/in.h> // for sockaddr_in
& i4 z6 T% T4 T, c" e1 Y( F: ^8 f) q - #include<sys/types.h> // for socket
7 E3 L) c+ H- V+ L: g, H2 w - #include<sys/socket.h> // for socket
; L" x/ h( v* I" d8 b( w - #include<stdio.h> // for printf 7 V3 q7 d, L" D* x9 s
- #include<stdlib.h> // for exit
' W; W6 I3 z6 _' t3 m - #include<string.h> // for bzero
/ Z9 ~. R" T9 \% p9 G0 o! f" e7 z7 W% u - - Y" L5 o1 ^: k9 n: t
- #define HELLO_WORLD_SERVER_PORT 6666 4 M3 ]( Z$ S4 ~5 |4 Z" ^4 x
- #define BUFFER_SIZE 1024
; O6 v2 @! f/ ?7 L$ H - #define FILE_NAME_MAX_SIZE 512 # o- ]* O H( T4 J+ e/ w
: ~; P$ M+ j" `5 o0 K3 l9 y- int main(int argc, char **argv) ) x; }9 t7 p1 a& u
- { 8 M i1 O/ s8 y$ Y8 i9 N
- if (argc != 2) 0 R" r4 q) J3 y" E1 E
- { % G1 R/ J1 N/ j/ W* }$ v6 j$ R) x* U
- printf("Usage: ./%s ServerIPAddress\n", argv[0]); 8 `+ `; s1 N) J$ o! a
- exit(1);
- c" a. y3 q! [, W/ R/ ~6 F - }
$ X v+ t- [" U
( s' _5 o3 \: Q& } N$ p U- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口 $ ^$ c n2 ?4 S& {- M) ^ G
- struct sockaddr_in client_addr;
# ~* x) Q8 z2 f* h( e: y1 }0 m1 T - bzero(&client_addr, sizeof(client_addr)); ( ?6 R8 U- ?8 _2 z' y% `+ h$ @
- client_addr.sin_family = AF_INET; // internet协议族
" M( L" n# a( e8 L( ?, m - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址
' e' M; F" s$ I( v. g$ a - client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口 & m/ P5 Y' p, T' a5 P
' a! v, H7 X2 s! g0 S* k: p) R- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
9 Z) Y: }. t1 j k& B s - int client_socket = socket(AF_INET, SOCK_STREAM, 0); 9 K3 f! O& k0 d$ B( k$ t
- if (client_socket < 0) " `9 U: B4 R8 K4 w& S* _- j1 Y6 C/ S
- {
/ p/ ]% o5 n* H( i2 f+ G - printf("Create Socket Failed!\n"); / ]! C% j8 t+ Z5 E
- exit(1); 2 h& q X1 x7 g, `$ l7 I$ T
- } 4 q( f' X( d6 o; ?; U+ {
- / X/ l+ q- U# V0 x9 ?5 @
- // 把客户端的socket和客户端的socket地址结构绑定 $ G) E* P, Q! D0 V
- if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))
1 @" h% g/ A) U- i - {
9 l! F' w9 f q1 X* I - printf("Client Bind Port Failed!\n");
, o! d& z n" w+ @% S - exit(1);
. L7 |2 J# g8 P2 d - } " R1 ^9 q4 M% v3 U7 n* I$ s
p4 ~2 H3 I% ^! o0 Q- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口
4 _' r6 o* \ g L7 k - struct sockaddr_in server_addr; * V6 ~6 X' M- X% a
- bzero(&server_addr, sizeof(server_addr));
6 y+ I8 k5 _9 \9 V/ J - server_addr.sin_family = AF_INET; - C V, t" _ ?9 D1 O& L
, m& I& d9 M+ Y4 l2 X7 ~2 f- // 服务器的IP地址来自程序的参数
7 s' _! o7 N; T- U- @ - if (inet_aton(argv[1], &server_addr.sin_addr) == 0)
9 X q- I& o+ |) M2 e - {
$ }- c- A3 a9 l4 }4 { - printf("Server IP Address Error!\n");
! U/ h, z% r8 r$ a - exit(1);
8 Z9 d# k2 Q+ ?( m' a' C - } U3 ~- x7 |7 }, W) k
. e$ q4 u1 U5 X6 u' t% O9 Q- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); - ?& n A0 q1 j
- socklen_t server_addr_length = sizeof(server_addr);
5 w! u; K8 J3 N+ B# h1 G+ X - , T- s$ w6 ], b- [
- // 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
7 p6 V* f5 B+ v: @; c- t7 V - if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
1 q2 I+ G& ?; Q9 x h6 K - {
4 ?# ~8 O4 H3 ?' y; ?7 k( z) g - printf("Can Not Connect To %s!\n", argv[1]); / x! K. t$ \+ V
- exit(1);
, b. k$ u% e9 f1 f4 a+ j: M8 x - }
% y9 v8 U" k/ w$ O" w# r9 k$ B
# Z8 U4 }3 E; x: p* e$ Q- char file_name[FILE_NAME_MAX_SIZE + 1];
/ o7 V3 `* g# d - bzero(file_name, sizeof(file_name));
) P9 x8 c' N0 f5 U, B' h2 t - printf("Please Input File Name On Server.\t"); 5 M8 ?, z W, A. `
- scanf("%s", file_name);
; V7 L4 m! l9 y8 u9 P' v0 @5 n - : U/ Y" r% i4 [( c$ o+ _, {7 [
- char buffer[BUFFER_SIZE]; - r0 P0 n1 a5 K8 Y
- bzero(buffer, sizeof(buffer)); M! I7 V) w! m& ~/ B: H& j) \
- strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));
# @! p0 p. `/ { Z1 u - // 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 # M; I- ~. m; u+ Y. n9 W
- send(client_socket, buffer, BUFFER_SIZE, 0);
6 s% d: _0 d# l0 k
: ^8 ^' K% j5 @- FILE *fp = fopen(file_name, "w");
Y8 ?: H; h- |( q# v - if (fp == NULL)
* C+ ~8 i$ c* n+ v w - { , I: d7 l& M6 r( u8 D* b8 \8 }7 F
- printf("File:\t%s Can Not Open To Write!\n", file_name);
# S( s# R$ L n7 O0 c - exit(1); $ K, y2 N3 N g4 ^* X2 `& K- x, p
- }
/ R. B& U4 F' [- h
7 s+ q) k* l/ U: J( G# L- // 从服务器端接收数据到buffer中 " y7 R6 O& O9 {# C) g" o/ M
- bzero(buffer, sizeof(buffer)); $ O9 x0 n$ Z3 O
- int length = 0;
- a& T' r8 `% a# v' m! S. _ - while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))
1 |: @6 v2 a! Z4 }3 E - {
7 M$ z, B! t( E$ Y+ } - if (length < 0) 8 }8 H! N! K% W) X% f" Y h
- {
2 p' h+ q& r$ }+ {2 I7 I4 V - printf("Recieve Data From Server %s Failed!\n", argv[1]);
8 @" r3 p: @2 U& Q: x2 M) K - break;
$ ]9 f6 p6 o6 V: X1 [ - }
8 U5 ]. h+ D& @& V" T% p+ @; L! t - . l% v) w; [8 o" m( u* s
- int write_length = fwrite(buffer, sizeof(char), length, fp);
: J+ E3 c7 l; C* d& L5 ~0 s - if (write_length < length) 2 M3 ] y6 g: v7 a% A. e! a3 ~
- {
6 Y c) b6 V# ?+ i4 @ - printf("File:\t%s Write Failed!\n", file_name); , L& w2 ^2 ^! z( u
- break; 1 w; D# f" l+ V* a3 D, r. ^! E8 u
- } 7 q/ I) f, Q7 r, j7 ?+ q* Y
- bzero(buffer, BUFFER_SIZE); ' l$ ~) t* q* h9 B5 o- K+ x7 T
- } 1 `9 E/ u! k' k. o! P
- 9 z4 i: G2 ~1 v8 m/ @' v
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]);
% y/ k0 o4 D. i/ m. e6 {; j9 R
/ s$ [' @* n) Y; v/ s8 _- // 传输完毕,关闭socket
; G* l/ f* N* ?. f, R/ l - fclose(fp); ) Z8 v& J% l! T6 n3 P
- close(client_socket); 7 B1 W+ S( b6 X8 J: q1 d$ }, _
- return 0; " \# G0 F! C( g1 v
3 X8 B& K4 W9 d; f6 f- } 2 ~) D6 |! ^+ H! Q; {
- , j4 e4 u6 B" X0 \" j! j$ ]
复制代码- /*server.c*/
( d) Q8 d) N% m- R$ ` - #include<netinet/in.h>
- I: h0 k) p- |) d) ?( Q - #include<sys/types.h># S; z+ l# Y) h1 B* K* c
- #include<sys/socket.h>, C: T* @8 @+ X% u4 u. z
- #include<stdio.h>
8 b5 B7 \" b* ^0 Z0 r' e/ Y5 Z - #include<stdlib.h>+ r6 w; p3 d8 K! |0 R- V
- #include<string.h>
$ N2 l- N' C% L3 H* s
9 K7 l* a {9 U1 v- #define HELLO_WORLD_SERVER_PORT 6666 //端口号! `8 H: M8 T' {+ `
- #define LENGTH_OF_LISTEN_QUEUE 20
* u" S' ?3 @7 w0 C1 ~) n5 Q - #define BUFFER_SIZE 1024
0 @' Q" J2 P5 ~9 z7 H; w7 e - #define FILE_NAME_MAX_SIZE 512' G4 f4 s* I7 |
- 4 p" r4 V) h* ^ q/ | _
- int main(int argc, char **argv)9 h0 I- ~5 y, W, B+ `% s _0 Z
- {
, _7 ?7 A7 }0 A7 z. q' i$ R( q - // set socket's address information
5 {: g8 y3 X/ e* i% q. [3 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
, K' b0 X" n V - struct sockaddr_in server_addr;; y0 I( L9 N# ^- a
- bzero(&server_addr, sizeof(server_addr));; }2 v" L8 J! s$ H+ x# J1 v
- server_addr.sin_family = AF_INET;
7 @) `- v/ W+ K. h+ g - server_addr.sin_addr.s_addr = htons(INADDR_ANY);; `' G# X7 ? J! Z
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);: f' F/ t% H4 L2 N* K! m
- . F( `/ b( _* G4 N2 t2 G1 I2 G- T
- // create a stream socket
; t+ T r# j0 G! [7 V( 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3 B% |) p7 s: |% ~- J, S. g# @2 P
- int server_socket = socket(PF_INET, SOCK_STREAM, 0);
. ?5 L2 J' B' x - if (server_socket < 0)
3 J" A- e9 Y" k7 J& ^& U# K' \ - {
" o8 ~2 `: @6 x1 [- ` - printf("Create Socket Failed!\n");
- M$ l5 v3 R* s b* s, R1 m5 F0 m1 ] - exit(1);7 X$ B: P) F5 Y/ E0 k6 p/ ]; Y6 H$ O) F8 M' Z
- }: Y) R/ b5 d( T1 r( i. D
- 6 `2 L& b$ `4 s" x$ V
- // 把socket和socket地址结构绑定
8 h" I3 E1 J/ n - if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
* q J% t" [& G6 Y$ `6 r& e8 ~ - {$ O5 Y8 ?: s. h" `
- printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);) ~* @; c% C: [* x. g/ a
- exit(1);! k" Y/ ]7 p% U5 P+ f
- }2 b) g9 _ I6 P( P1 G5 o8 x
1 y# {" w2 o) Y) p- // server_socket用于监听
. {/ E/ b/ X* H5 v - if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
' Q8 q5 w& A0 M9 h$ M* r* v - {. {9 ]3 r9 j+ B
- printf("Server Listen Failed!\n");% Z& r2 H5 ]1 F6 V
- exit(1);
s' x. C5 s( f: q. k, \ V4 C - }
' e. V* q P" X - . J, _. e4 g1 R, T# D
- // 服务器端一直运行用以持续为客户端提供服务6 s, `: O, @0 F3 {! t. w6 _9 I* O
- while(1)
8 o6 J6 X- H5 U: Z) L9 F5 G8 b; w - {3 k- B5 |$ k8 p: {0 g9 B
- // 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
. L* @2 }' \0 k: H. s' p - // 接受此请求,同时将client端的地址和端口等信息写入client_addr中
5 I2 g1 P J: }9 J: } - struct sockaddr_in client_addr;( G4 B/ H0 H% u1 Z$ b1 H9 F
- socklen_t length = sizeof(client_addr);
" C0 j6 f$ b& E+ `5 ^
8 ? K. U: o4 t( Z( d2 f- // 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
# R1 W& ]1 R3 o# D9 ^ - // 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
0 x! q/ G1 v2 d: N - // 用select()来实现超时检测/ C" q; D. k1 g) U 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
; M9 A$ m2 k) u; L7 _# J. ~. h - // 这里的new_server_socket代表了这个通信通道
4 J p5 j0 I; c2 p$ o* O- B - int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);$ T! g, y+ R# i# w
- if (new_server_socket < 0)
* q1 o+ d4 R5 w' e! A. k/ _ - {+ C( I5 B2 G5 e5 M
- printf("Server Accept Failed!\n");: {5 L! z1 h9 ^3 I. K- Y; i
- break;1 D; h8 O3 Y+ P6 B, H1 Z$ w! f
- }
8 D Q' a1 F; I - : F7 H2 h6 R3 L: F
- char buffer[BUFFER_SIZE];7 G8 u" M& t5 P7 b8 S
- bzero(buffer, sizeof(buffer));
7 g2 c$ F' W; S+ @! e( n - length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);7 Q1 A4 `+ c, M& f j
- if (length < 0)9 H) e8 @, o6 y" n0 d8 f _4 ?
- {# ]. K2 R0 ]" [
- printf("Server Recieve Data Failed!\n");8 O; x+ ^( }3 j% Q% ~
- break;
! `8 @. U% R7 g$ B w - }) _+ {( s& G2 S. @/ w# W
- ; k; C$ ^: H3 S/ @9 w9 G4 D
- char file_name[FILE_NAME_MAX_SIZE + 1];
' `) J8 ^9 {1 v | - bzero(file_name, sizeof(file_name));7 Z: f) u" M1 w+ d: ^# ~
- strncpy(file_name, buffer,& L5 }7 a) @4 u9 i w& S
- strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));
0 d7 @3 q" L$ j7 ?* G - ; g; C/ y" K$ z# e
- FILE *fp = fopen(file_name, "r");0 X7 v8 f8 [. f% y, a' q- I# V" P+ T
- if (fp == NULL)! d2 l- M% ]; F5 P8 }2 S! t
- {$ P( L- u" o; C! g
- printf("File:\t%s Not Found!\n", file_name);; ^7 s: r+ z5 d1 b8 X% V
- }
6 m2 k0 e: e" Q - else" W2 @0 I) e" G) g) e+ B* B
- {+ e0 b7 n6 {0 u3 c( m8 R7 X
- bzero(buffer, BUFFER_SIZE);
( F+ @5 N0 g: `1 k+ }& U - int file_block_length = 0;4 j) Y- B* L$ r' J, S
- while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0), g: v+ M+ n" X$ T
- {
9 C: F: v1 K/ i* D1 E g+ Z - printf("file_block_length = %d\n", file_block_length);
# A& R" L m6 ^
' I5 W1 ~8 G& \8 T- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
( m+ m. o, Z! a( X8 K - if (send(new_server_socket, buffer, file_block_length, 0) < 0)
# [3 w( z! }( G7 I - {' R3 t1 @ D8 p; n
- printf("Send File:\t%s Failed!\n", file_name);: J' H1 x+ ]( A
- break;. r+ Q* ?6 S: ^4 k+ m
- }. y6 k4 f' i3 g2 R$ k- |
- & n6 ]$ g" P: C
- bzero(buffer, sizeof(buffer));# o3 i- D7 |$ y0 }) m; }
- }
" I1 g# z+ Z$ I- k - fclose(fp);
* j+ P a x0 C# i' n1 o* D - printf("File:\t%s Transfer Finished!\n", file_name);( t" K3 [/ _, G
- }6 e4 Q* x# M: Z$ _3 K) M
- 0 Q* E; {1 ]3 ]+ y7 c8 P
- close(new_server_socket);6 g7 c4 K f* ]& {' ]4 Z) _
- }2 Y/ l. J L; j
- P8 ?- g1 O% s: d9 i
- close(server_socket);
& P0 e% ^0 ? T
* ^0 G; h+ a( p- return 0;
8 K% O Z# a8 j" x" Q: i1 @ - }
) c, c. K3 J' W' K9 Y
" v- k* K4 e. H
复制代码
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