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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.: X9 \8 l }9 }0 O4 h' G2 R
- /*client.c*/
! w/ f9 w, ^, }6 w5 p& Z4 ^5 R$ X - #include<netinet/in.h> // for sockaddr_in 7 N! u+ m$ E+ b+ t
- #include<sys/types.h> // for socket ) k; W5 o5 \1 a# L: B) z: C
- #include<sys/socket.h> // for socket
7 Q; d) G( t7 O/ u' t - #include<stdio.h> // for printf
7 Q4 ?% E% V6 E( R - #include<stdlib.h> // for exit . u; x: F9 K- D4 Y5 m; f
- #include<string.h> // for bzero
7 u; e' U7 D% a6 w1 y2 u# ~ - + i. K% I5 g( i' u
- #define HELLO_WORLD_SERVER_PORT 6666
# c$ e' l# w2 ^$ Z" T- U' S- r$ S1 t - #define BUFFER_SIZE 1024 . W ^& P4 S: T( x
- #define FILE_NAME_MAX_SIZE 512 0 W5 y+ d2 n$ y5 `4 Q
, u4 d2 H+ L! y6 g0 N# v$ x# q- int main(int argc, char **argv) ! {- c) i. z, q' G3 \& ?
- {
4 K, H" e# R; Z9 z, i - if (argc != 2)
5 x( ^+ i L& R, g' W" F5 u - { ' B1 I- G0 M+ h+ M7 h3 A
- printf("Usage: ./%s ServerIPAddress\n", argv[0]);
' H8 B" o# u) U% K8 T/ Z - exit(1);
0 m) P% c' ~- K4 ]$ K5 d - } 1 |1 M, E( `% Y1 G( v/ e k0 x
- 9 X* G Q3 Q% |4 W
- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
! ?; m+ B7 v2 h2 i. u - struct sockaddr_in client_addr;
5 d5 |" Y8 ^7 \1 N* _, f - bzero(&client_addr, sizeof(client_addr)); $ u4 x( W' ~/ _- _# a3 V
- client_addr.sin_family = AF_INET; // internet协议族
# U9 J* Z9 y9 b - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址 2 g( I+ S' ]) f
- client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口
9 z- L: w r# o - * m9 U5 D0 _0 E) l
- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket . r4 O/ ~6 W8 g/ ^$ ?. I
- int client_socket = socket(AF_INET, SOCK_STREAM, 0); & k" ~% {/ Q" h }3 p6 c5 t
- if (client_socket < 0)
8 s9 v: u+ c' }9 R; }6 i& x5 e - {
8 h; O& T k7 E# R/ r; c - printf("Create Socket Failed!\n");
( H* l% m9 `# w8 b3 N' x! w - exit(1);
8 l9 m% N# f. e, G1 ?4 p5 I - }
0 }% x7 W: y2 S% w( e
9 R4 M1 h6 g4 }- // 把客户端的socket和客户端的socket地址结构绑定 7 I- q2 g; z0 ?2 I% O
- if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr))) 2 z4 n( ^% t6 t
- { / u6 x( ?/ h5 b5 S2 E! H* |
- printf("Client Bind Port Failed!\n"); - F1 m! ~0 C( E( S% N
- exit(1);
4 H. b6 X" Q- z6 U; K0 H W3 _+ i# A - }
q! n2 }' W. K - . A, Y3 ~" a* ]% B- m
- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口 2 r! ]6 N! C) {0 A6 @
- struct sockaddr_in server_addr;
( I# j# @& ?; w, A$ s' x9 I - bzero(&server_addr, sizeof(server_addr));
2 R9 c0 U% d2 f - server_addr.sin_family = AF_INET;
$ Q- M$ h7 ?$ y# S" a. u
5 w) X, l! E1 I, e7 X/ W8 I# X- // 服务器的IP地址来自程序的参数 * e! i* w( G- \1 y$ ~( D
- if (inet_aton(argv[1], &server_addr.sin_addr) == 0) / G9 x' _9 b& A7 D1 G8 n/ K- r
- { ; y- \0 Y" l! V" S, u$ F
- printf("Server IP Address Error!\n"); / N/ ]# e, H$ L- d3 b4 T2 H; v
- exit(1); * u7 Y( V0 @0 y" ^* E
- } 6 G. [8 U- ?9 Z" s B
- / d3 z8 i8 Q- ^# ?2 `: ^- {) T
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
1 X2 U/ L( p" i/ O# v" F% [- d - socklen_t server_addr_length = sizeof(server_addr);
( d9 c9 T& a4 @+ j4 E2 _
$ u6 j2 {- k) t/ ?5 i- // 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
+ b) b' O5 }! `; M8 A; q - if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
9 l1 T+ i1 _& ^8 }# x! _0 o - {
* l8 e" K$ R# Y2 a% r - printf("Can Not Connect To %s!\n", argv[1]);
4 m8 |/ D! |. @4 k! g0 g - exit(1);
+ j% Z* C D W/ a# i) e5 `/ P5 g - } ! _/ ?: T# b+ ~- Q2 j3 y: `
- 8 ?- K5 G1 u4 ?7 A
- char file_name[FILE_NAME_MAX_SIZE + 1]; ( }5 l' N! L4 E |- ^8 S
- bzero(file_name, sizeof(file_name)); . f9 Z$ [/ G3 d0 k& ~9 H
- printf("Please Input File Name On Server.\t"); 5 g7 n. i7 o4 f5 t+ R
- scanf("%s", file_name);
! f6 d" ^3 P$ o( b" [( c
& w/ I# W% H `. @% |- U7 B$ b- char buffer[BUFFER_SIZE];
& u! O! ?1 }) G* R1 P: X- O1 i - bzero(buffer, sizeof(buffer));
. o$ H# @. P! D9 _ - strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name)); : J8 M' ~4 E: v' [ M7 b5 V
- // 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 6 l/ Z2 M/ ]1 e/ a7 [, \
- send(client_socket, buffer, BUFFER_SIZE, 0); ' m" m+ b0 L O9 [6 m
- & X! x M) R$ j" b; ~
- FILE *fp = fopen(file_name, "w"); ( u. J: o/ n: q& Y) F4 S
- if (fp == NULL)
" ]8 ]) Z, \) H, {5 L- M - {
8 |5 a5 b; G/ ~, V: ^, k - printf("File:\t%s Can Not Open To Write!\n", file_name);
3 ?& w& E$ D: x( U2 Q - exit(1); : u) Y( @+ {% H
- }
. F+ \7 S# x6 { x1 h `
$ U0 W/ K. K/ K) z- // 从服务器端接收数据到buffer中
7 D) @' w1 T- i/ p3 I7 A0 f - bzero(buffer, sizeof(buffer));
4 M8 _ c, h8 V: q - int length = 0;
8 {) L# b; p, S5 w+ x: [- e( o - while(length = recv(client_socket, buffer, BUFFER_SIZE, 0)) 7 t( Z" _+ Y1 ]
- { & d1 z& ?. U% z6 N0 a. t& ^
- if (length < 0)
8 E& G( \: U# u9 }/ r2 E1 e8 R! R# b - { * E" r) K; j @! E7 [ K" [# T5 S
- printf("Recieve Data From Server %s Failed!\n", argv[1]); & w! R5 V- B7 S
- break; 7 f5 q$ o- T8 n% _1 T
- } # F" Q$ w- Z" \- H/ j
- ; J6 h& T3 |% g+ X# b
- int write_length = fwrite(buffer, sizeof(char), length, fp); 1 j7 f# J5 l5 {" _- I/ J3 U2 @5 E
- if (write_length < length)
7 t% I7 Z7 m; j* f9 ?9 C7 j - { ; f* V9 R& @8 @5 y
- printf("File:\t%s Write Failed!\n", file_name); ) _2 h5 p' c; P1 X
- break; 2 J! E# G" z; l5 p; _" u5 k
- }
$ A) a* i: h4 w W" @ - bzero(buffer, BUFFER_SIZE);
0 X9 j; L' J1 t7 Z# A! r. ` - }
- W5 O7 p2 o* K. g8 ?1 n3 k# z
: ~4 T/ i7 j: n- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]);
+ ~& A9 D \' X+ R
" Z% T7 S5 F- v) A7 P- // 传输完毕,关闭socket - H$ N% o: T0 X' k. c, Z& y4 r
- fclose(fp);
$ e+ h n% [; H' d/ Q - close(client_socket); + [& F9 Z) D& K: U) i
- return 0; 6 t) s! G5 J' K6 ?% k
- / A0 {/ W- ?- p- B5 e7 f
- }
: {' M% x& T" F4 k& d
0 c8 ^: t, D( ~: v+ N' p1 y
复制代码- /*server.c*/6 ]& x9 f" L2 P; w# p
- #include<netinet/in.h>
. c. e4 d) A, }# B! B8 t* Y - #include<sys/types.h>
8 q. g ?3 u u - #include<sys/socket.h>
T! C# H9 T, c8 \- |) U7 O - #include<stdio.h>
* W9 ^( t/ p) q/ _3 \/ |0 Z - #include<stdlib.h>
2 G4 I4 W6 \# e: e0 z2 {: \ - #include<string.h>8 V5 q. }' ?) \
* n7 g0 y1 l) H0 V& x6 y8 ?- #define HELLO_WORLD_SERVER_PORT 6666 //端口号5 ?! i! ]4 B# F6 t
- #define LENGTH_OF_LISTEN_QUEUE 20' J, W2 k# w, Q3 S! l+ ^- x. v
- #define BUFFER_SIZE 1024
9 B# N9 R( T/ H, P' A! I - #define FILE_NAME_MAX_SIZE 512( Q3 k- _! a3 N; N- s
! |$ R. A6 ~3 ]6 i) V3 ~- int main(int argc, char **argv)
* Q9 Z l0 W) Y. g) K* R. b - {
7 l- I3 {; T6 w: _$ \ - // set socket's address information
; v! I3 `: s6 ~6 M+ ~ - // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
2 v" c( W2 u* M8 L9 h8 o+ J - struct sockaddr_in server_addr;( P, r4 Q1 e/ Y3 ~
- bzero(&server_addr, sizeof(server_addr));
" D( Z+ N* Y# k0 s: p7 z+ Q9 i; h - server_addr.sin_family = AF_INET;
& I/ Q/ [- H( v4 m6 ?2 a. W; v - server_addr.sin_addr.s_addr = htons(INADDR_ANY);
0 j9 x! F3 ]8 v - server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);3 D- L4 K0 r U! \4 p' a4 u$ Y1 y
- 2 v; P" n' I0 ~8 n1 Z/ c: E
- // create a stream socket
8 I; y5 v5 z$ p2 x: C+ G$ B - // 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
5 S/ X0 U, ]5 D% P- D9 D - int server_socket = socket(PF_INET, SOCK_STREAM, 0); G7 N( D, ?8 V7 G( c- R: Z2 T
- if (server_socket < 0)5 P& [& {' g; V
- {: A( z$ u& ~" v- z& n
- printf("Create Socket Failed!\n");* g8 d# |! \. ?: K3 ^" x
- exit(1);
8 T0 }, y5 s- w7 C3 X6 K - }* j i7 z! p. A, f9 `# F3 l3 L
- % U* Q- s' X) Z$ b2 Q2 ~
- // 把socket和socket地址结构绑定* k# b! e# _# m+ I
- if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))" `) d% y7 `' J+ o
- {/ j; x- S" {3 ]: j! d( l
- printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);9 e2 p; }* |3 `* r% Z9 o
- exit(1);6 Y( u3 i. x4 r2 G* u
- }
# @, z/ {0 m+ u1 k: ]1 s - $ s' X5 [9 u1 ^
- // server_socket用于监听
! s+ y- j! @" Y. v, o1 }( I - if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE)): p( w: F& m( W2 P4 h9 t, f
- {
. U+ ?; k8 z# f" X: Q - printf("Server Listen Failed!\n");. P5 t$ f$ u0 F( E7 w+ u
- exit(1);
5 p, e/ }" Z }$ {, t0 X& B - }: @ @9 z9 Q4 B! K$ p: i# M: l
- . Y: Y2 @' `, O g3 i
- // 服务器端一直运行用以持续为客户端提供服务$ {0 V" I! }5 ~+ U, K
- while(1)) g. ^; v# Z. T0 |4 _
- {
9 p. B* A1 z! n( F( Q - // 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: i" J! `: d+ M% A' T' a - // 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 _$ k' p8 Q; n: [ - struct sockaddr_in client_addr;5 z. l* b7 X' k& |. |
- socklen_t length = sizeof(client_addr);3 g) I% Q5 e H9 [, i: b. x
- : k" g) E! ~, F; K( F( 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
* ^& C3 P3 k# Y/ O9 @. l X - // 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/ d n k' J% l' f
- // 用select()来实现超时检测7 ] G3 H6 r9 k% E& ?
- // 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
9 n* s5 t- Z6 C6 d& Z. s0 l - // 这里的new_server_socket代表了这个通信通道* l$ ]$ |. U- k/ K: R
- int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);
/ N" K8 V" b; r z5 u4 \ - if (new_server_socket < 0)* y5 e9 c3 c. y1 B2 V
- {0 ~" v- S0 M! M- P4 |7 x
- printf("Server Accept Failed!\n");
$ P2 k: J+ U) b - break;
, Q, H7 N1 X& g9 x: L - }+ R) }& z& L H6 N2 ~
- u' c, n" }1 L) w# Y
- char buffer[BUFFER_SIZE];
$ Y4 e8 Y" N1 Z& Q - bzero(buffer, sizeof(buffer)); L3 n: A& I# f! A
- length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);7 {" c2 E \' ~* G
- if (length < 0)
* ~5 f" |2 M' _7 \3 n- l - {
% N1 P! t: E# s9 ], _5 N - printf("Server Recieve Data Failed!\n");
" }0 r) }+ F( W6 N - break;
9 v1 ]: k9 ^; J2 C+ ^) b - }
' |" b- P e2 r
) o7 G l7 w4 S: v: `- char file_name[FILE_NAME_MAX_SIZE + 1];! A# W% Z7 c# }+ z# P# E; W. c) f
- bzero(file_name, sizeof(file_name));4 ?+ f" v# I) i, a- \
- strncpy(file_name, buffer,
\- @! n# T8 r' @6 \% R1 g - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));
) S9 B5 v' [7 E! B0 q - ( I; o5 }& c! ~! o1 U7 m5 z
- FILE *fp = fopen(file_name, "r");
0 i& ]" L* D3 T Z; Q5 M6 O; o `8 e6 H - if (fp == NULL)# R" J2 C6 |, p6 D. I
- {
' x) e' o+ a- X2 K. G - printf("File:\t%s Not Found!\n", file_name);( v- g( n9 T$ ~$ B4 M( x8 V) z! c
- }
- s# f$ D/ _: _2 X9 ~, r& S - else: X" q: k1 ], E1 L8 E' _+ c6 i
- {: D( p( Q5 L8 m
- bzero(buffer, BUFFER_SIZE);
2 I/ D+ `+ t+ j# S; ?) ` - int file_block_length = 0;
) ?" k* `5 w+ t) t# A; u9 x - while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)% D5 `) | d7 X. v5 C! J
- {
. S6 i2 m. R; z/ [ - printf("file_block_length = %d\n", file_block_length);
3 B T* a( n/ |! X% \
9 a) s6 v% B+ p; M/ Z+ y- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
+ s3 D8 I8 g: d- c - if (send(new_server_socket, buffer, file_block_length, 0) < 0)( |! v3 o, F! S3 i6 p' P
- {: d" [: F2 J$ I/ i5 x: O; @% @
- printf("Send File:\t%s Failed!\n", file_name);8 ^0 u# `0 F' T; N9 H! Y
- break;6 i+ { P3 i L- ^6 w* Y1 L& m
- }
0 h+ c+ g' ?- G: S& Z+ t0 n - 9 X: a9 T) P9 v! I: |
- bzero(buffer, sizeof(buffer));
* X' {4 S/ q0 @( G y8 g - }
8 @+ h, |- C8 S {4 y - fclose(fp);
4 A+ N$ e3 W1 ^ - printf("File:\t%s Transfer Finished!\n", file_name);- T/ J/ W- b% Y8 ~* ^6 _
- }
7 J! n; u0 c8 L7 `1 M4 C
( l3 U1 b% ?6 N1 c- ]- close(new_server_socket);
5 r# {$ y& h0 |% K( `) B/ H - }
4 P( u1 G& h5 D. h1 A
7 }# Z, r6 U0 H2 M- close(server_socket);
7 J( S' X. h( I. q) \/ } - # C/ O$ y2 h/ E( T) _* a
- return 0;) d$ ?' Q- X' z& p- L. V2 u" z: ~/ c& Q
- }
. o! z6 K, s, m2 k3 J6 j - ' H4 ]0 m+ @- e4 F8 x" W
复制代码
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