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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.( q/ v0 i [' Q" @& x: N. Z6 y
- /*client.c*/
2 N: `7 Y! l1 ?" J8 T1 v2 T - #include<netinet/in.h> // for sockaddr_in + m; }0 Z; t$ s$ ] w2 P
- #include<sys/types.h> // for socket 4 Y( p4 o' i; N; p) k6 K- a
- #include<sys/socket.h> // for socket 3 a) C& f9 e0 x/ ~5 j3 o; G
- #include<stdio.h> // for printf
- t9 ~) H3 t. G2 p* _" }( q! _ - #include<stdlib.h> // for exit
0 |0 B) I$ `8 K( _4 D - #include<string.h> // for bzero 0 `; h4 j( g h3 R5 U- M
- 5 K. j$ Z5 K3 V6 B, l/ r3 E
- #define HELLO_WORLD_SERVER_PORT 6666
: w3 `: p4 t. r% m - #define BUFFER_SIZE 1024
! t1 M& Z T" L o! f) x) Q' P - #define FILE_NAME_MAX_SIZE 512
2 @: g1 \$ ~) k0 p' d; w; V+ g - 3 V& ] u3 s) n
- int main(int argc, char **argv)
* t! ^: e5 Y* m& H! \) y- E - {
4 h& D0 h" I! Q+ @3 ~: l! G - if (argc != 2) , w8 F* d" {" {
- {
: h( H# a" I& z) ^, q - printf("Usage: ./%s ServerIPAddress\n", argv[0]);
+ O: e, w. g5 G0 A - exit(1);
+ i& i# e. {3 r1 a: s4 s- i" r - }
) ?2 l" u8 |1 H% Z( E' n+ u
: k9 \7 b; @& ~- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
! Q# H' l0 o2 _* a6 u# f% F - struct sockaddr_in client_addr;
' E; x& l+ u% k5 u - bzero(&client_addr, sizeof(client_addr)); 3 J% F$ y/ w3 V1 A4 O" D& ]. {& V5 Z- k
- client_addr.sin_family = AF_INET; // internet协议族 - G5 U, |, W. q& x4 K
- client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址 8 V- s& Q1 w) E z" z4 L, I
- client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口 * v- P4 g8 }; {: k; `1 x
) Q) A3 |) z, A# p; m* Z% p) q- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
' T3 b4 m* G# A! e - int client_socket = socket(AF_INET, SOCK_STREAM, 0); 9 |$ j: Z& h+ ^2 z$ c
- if (client_socket < 0)
$ o3 d( |' H$ e i; \8 l4 e' z - { & K" t$ K0 n2 M. u6 f
- printf("Create Socket Failed!\n");
) j% u5 e5 K( K0 \" | - exit(1); 1 v+ j# g) v# L: v, W' W% M. Z
- }
6 M M1 Y2 S: Z" u - ' R3 L+ q* h U4 l- j
- // 把客户端的socket和客户端的socket地址结构绑定 0 N8 N7 O# F. F0 U& E0 ?/ o6 x
- if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr))) ' O2 r/ p0 N8 c6 r7 `; r
- {
* O1 r! Y+ f4 V) S& _: H1 C1 }1 q - printf("Client Bind Port Failed!\n"); 4 \9 d" y J f- v: C- i, Z" n3 O
- exit(1); ; S2 p- b( l- J0 ~
- } 6 a3 F8 r% m6 M7 g
' p# n; W8 i/ i$ ^2 R- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口 3 a7 _$ N! [8 Z! C# v: e4 v
- struct sockaddr_in server_addr;
% c) o! r0 p6 Q0 c; [ - bzero(&server_addr, sizeof(server_addr));
% _( v- M( j! _2 w5 E' b6 c - server_addr.sin_family = AF_INET; 7 `1 f. b+ L8 H" a$ G
- 8 R0 |1 r9 U1 X0 x
- // 服务器的IP地址来自程序的参数
; ]& p# l: |& T1 ~ - if (inet_aton(argv[1], &server_addr.sin_addr) == 0)
4 d- z- h- w( |$ C* u! { r( {/ M - {
4 _. z2 Y5 v& |* I2 ]# N2 U - printf("Server IP Address Error!\n"); + \2 @1 g O2 d; S
- exit(1);
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$ K! ]9 e2 S9 u* ^1 A- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
( i' y4 ^- S' j$ | - socklen_t server_addr_length = sizeof(server_addr); 5 T5 K& S4 T# h" C* Q
" d% L! ~' G. b% P5 v9 T+ d- // 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
0 T! H7 K8 w1 c! C! w - if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
$ }' f k. \! F/ N& E - { 9 o! d. {2 q8 B! W
- printf("Can Not Connect To %s!\n", argv[1]);
0 U7 }& f/ L) T* q+ O' m+ ? - exit(1);
8 v: T: W6 w1 r V! T - }
) s7 \) J9 v- C
' [+ ]3 ?' n& f+ l+ I5 p; p- char file_name[FILE_NAME_MAX_SIZE + 1];
9 J4 G8 {1 {: H' c8 P6 Z - bzero(file_name, sizeof(file_name));
& D$ i' e# B9 \" W4 I5 g E - printf("Please Input File Name On Server.\t");
* X7 g$ R2 D4 J! X* d* m - scanf("%s", file_name); U: ^8 L# b) E0 W
$ [3 M* o+ ]5 u# |- char buffer[BUFFER_SIZE]; 9 o% _' k4 C7 p6 T
- bzero(buffer, sizeof(buffer)); 3 W. \- u5 a/ c' z6 ` T# ~( _
- strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name)); 7 c: a( p( e) p: J7 e2 D- g
- // 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 ( c2 K1 I: h2 J; ?# R
- send(client_socket, buffer, BUFFER_SIZE, 0); 6 J" |% \7 p8 z W8 v& c0 ^
, J1 V% T. i6 l( L& i" J- FILE *fp = fopen(file_name, "w");
( @( q/ i+ {6 F' P1 ]3 s - if (fp == NULL) ) M8 P# S- u! y9 ^8 c6 K
- { 9 W; ~5 G- O, H1 m) m7 h
- printf("File:\t%s Can Not Open To Write!\n", file_name);
) q4 c7 @/ z- B( W; l4 h! \2 R - exit(1); 3 u7 ~) n% M# ^0 @7 C0 i
- }
$ u# W" N0 ?2 t
8 Q: z( ^3 [0 T- // 从服务器端接收数据到buffer中
4 Q! t: B z ]# [ - bzero(buffer, sizeof(buffer)); 7 ^7 i4 U; \( }0 c3 M
- int length = 0; . L0 r% e( |+ }" }6 M% X( e5 ]
- while(length = recv(client_socket, buffer, BUFFER_SIZE, 0)) , \! T% ?' H2 E8 |/ [1 `
- { , i0 w; w3 U9 }2 w
- if (length < 0)
. t8 Q# f! @7 Y$ k; h - {
3 g, }8 @( [; x - printf("Recieve Data From Server %s Failed!\n", argv[1]); , i+ h- {3 r7 P8 u1 u" @- h
- break; ; y r+ b5 t* n/ h; C' W
- } ) a9 d, \1 k8 A8 L
. q$ N2 V; l& I" S2 V* t1 }- int write_length = fwrite(buffer, sizeof(char), length, fp); # F: F2 O) q1 N. P! r: {# ]
- if (write_length < length) 5 }, L$ u- c3 l' I
- {
' p3 O9 v5 p y* e$ Q - printf("File:\t%s Write Failed!\n", file_name);
/ y" [0 w- W7 b `2 A - break;
, L8 [3 \4 h0 O - }
" W6 U% d8 v: @$ H8 O - bzero(buffer, BUFFER_SIZE); 3 c( ~6 W9 `8 `0 \& f) {8 |. @
- } {0 J% l8 X% K* d! n/ g
- * D) S) G) j( K' h
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]); - L* B. ]1 r' q! F) v, t2 k
+ @/ j# L0 l) D4 e- // 传输完毕,关闭socket / q- V; `: y9 N6 j s) J; M
- fclose(fp); $ l9 n$ J$ i6 B4 C5 Z8 A5 h
- close(client_socket); # r, d2 k9 R% L
- return 0; ' G" L: t ~! w: M, C! S0 H
! ?* ?# g! m3 o' T7 e* T- }
4 ?1 Y2 J4 [+ g
8 K0 k% C, n% J/ L4 u
复制代码- /*server.c*/
: \/ r# Y+ m- }$ i' m6 v+ ^6 o. G4 ~ - #include<netinet/in.h>
+ m) n$ @0 H% Q& C7 Z - #include<sys/types.h>7 r1 c* G& ^) _: N% r
- #include<sys/socket.h>. ^; I+ G' f. ]0 T
- #include<stdio.h>
8 ^- d; Y5 W, n* \: C - #include<stdlib.h>
& n H' w) W) O- r' f - #include<string.h>
( M) C% J4 }( V3 N
/ O( a2 {8 o3 | b7 e; g; n2 e- #define HELLO_WORLD_SERVER_PORT 6666 //端口号" x) D: ?" G, U' P. s5 F4 P x
- #define LENGTH_OF_LISTEN_QUEUE 20+ I+ }" B8 @1 p5 H
- #define BUFFER_SIZE 1024% g* f3 D5 V9 M- o1 H( q
- #define FILE_NAME_MAX_SIZE 5122 y; e4 K% P- {9 f6 Z
. ]( E) {. g) |7 J% F- int main(int argc, char **argv)
/ B/ E8 j( Q( b - {
* T2 n( l+ Y3 P' F - // set socket's address information
! K( w1 b" E' I( m* `3 \ - // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口, n$ o) y% X1 |# U
- struct sockaddr_in server_addr; P+ y' z' z% _9 J2 @$ y2 M1 w
- bzero(&server_addr, sizeof(server_addr));. [* C$ b1 S5 r+ l0 y5 x
- server_addr.sin_family = AF_INET;
0 I; r$ K7 V( h1 i: e - server_addr.sin_addr.s_addr = htons(INADDR_ANY);" g6 g3 z4 \. l) E: E5 ]6 `9 G
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);4 \/ c8 k% P# O! O" R) F
2 _* o" }; r$ h5 a2 Q0 }- // create a stream socket( [4 n) g8 J: Z5 S
- // 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 H' D6 j! @8 C6 i& M; d. N
- int server_socket = socket(PF_INET, SOCK_STREAM, 0);) P8 \; e. R1 _! Z
- if (server_socket < 0)
6 T1 m( _0 S( A& w. X# n: I$ i - {. Q$ z3 ?0 \1 M2 R! F- ~7 r% B% j
- printf("Create Socket Failed!\n");
k* i- x+ j! M# [1 N! O- j - exit(1);
+ D6 U( F$ u8 z% [3 E3 ~2 q3 ] - }
a2 ~1 L/ Q8 `: w
" v Z, m7 ?) u6 j6 j1 i- // 把socket和socket地址结构绑定
: K6 m! o$ E$ P9 h, F - if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr))); X8 B* x1 P# t5 R
- {/ A# x' {+ Z5 n' R# l
- printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);" g4 U S6 Z0 `0 m( T5 U4 ?, I
- exit(1);' V! [) S$ u' w8 T+ z% p
- }6 x! T. z" W, W3 [$ \! K2 l3 M
- 1 D: x9 Q0 J% Y# C- `0 ~% s
- // server_socket用于监听
5 K7 V3 i8 L' j# i3 l: w6 c - if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
/ _/ R# A+ f4 U3 w a. h - {5 H& F# E; R1 C
- printf("Server Listen Failed!\n");" I3 L) X3 [- G! l+ e: f
- exit(1);* B% G! O E' k+ X6 k; L3 c6 X
- }2 L4 R7 f+ |! k+ M
5 E, {2 O- `/ X* `- // 服务器端一直运行用以持续为客户端提供服务
6 j/ q8 x6 O3 |' Y1 Y8 u - while(1)
) E' J9 |* |' { F9 S; G& N1 [ - {
; C" I4 |- B( c- {+ 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
: R9 s0 Q( I) e5 L - // 接受此请求,同时将client端的地址和端口等信息写入client_addr中. _ K( r0 g" U5 K8 w- T
- struct sockaddr_in client_addr;
3 b' b9 q9 c9 t/ u) T - socklen_t length = sizeof(client_addr);4 c/ i) h/ _) O6 k' f! D
8 ~9 v+ {4 K2 P7 |! r- // 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
' T1 k/ Z) g( } - // 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" Q9 I* l4 X( |$ a# T0 H' o
- // 用select()来实现超时检测% F. m; ^& Y2 k. a% a
- // 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
( K) g" ]8 Q4 U, e2 L, F, g - // 这里的new_server_socket代表了这个通信通道2 P" u, Z7 T h% r+ M0 G# Q
- int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);
/ B! f8 G) S) I9 L t% K. M - if (new_server_socket < 0)' F2 ^$ D# X$ z9 _' A3 y+ y
- {
" C$ @, B0 W3 y( z; I( h - printf("Server Accept Failed!\n");
/ D6 z3 u( [: P/ L0 o+ P# B - break;4 S" b4 C' c3 }/ y r
- }" J7 @ ~7 _8 }
- & V- ?8 q" n) s! g
- char buffer[BUFFER_SIZE];9 [5 c. U6 q; p0 C& W O/ T! u
- bzero(buffer, sizeof(buffer));' H( f7 d$ v# B; ?& N/ d
- length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);2 b' p q; F/ v' g9 |1 o
- if (length < 0), C& e7 R8 y. ^% ?5 c. h
- {
f' n0 b) V7 ^. _' S1 U8 w6 e - printf("Server Recieve Data Failed!\n");# F7 I$ N' h g' g$ Z
- break;
7 _* F8 w& I; V; N6 v2 }& o - }" }" }2 r8 O, i& V3 K
- - S" e) y3 @ p; u; u( X$ t/ q1 u
- char file_name[FILE_NAME_MAX_SIZE + 1];5 g3 {2 H0 H" w8 V& a
- bzero(file_name, sizeof(file_name));
/ B. s9 N8 v- B% W% E1 {6 T) ?$ | - strncpy(file_name, buffer,. @! G4 d5 @7 i' t5 _5 M) u
- strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));, h8 V) j) K+ L& V$ M
5 ~ n$ [, m9 A& P0 ~3 O; `# R- FILE *fp = fopen(file_name, "r");* }6 [# `% E) v; J, v, t6 ?/ A
- if (fp == NULL)$ c/ g( B' q" [" v$ J
- {# A' r h; X& l% ]* `0 w* ^: u
- printf("File:\t%s Not Found!\n", file_name);: M7 q- I5 a0 [9 l
- }
1 M' A4 z7 ~* o" f5 N - else3 T% _& o3 }! G) j
- {1 g m% _+ m3 d0 ?7 b
- bzero(buffer, BUFFER_SIZE);
( i ^% S) F+ G! C/ X - int file_block_length = 0;7 u c$ G( H* y% J) R
- while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)2 T: }$ S7 e' } m
- {
3 W1 p, S. L! M! j - printf("file_block_length = %d\n", file_block_length);5 \* d0 [' F1 s. j2 a1 m3 W
. x& J/ q3 i) v9 w( H* s- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端7 ` M( C/ s3 k, M/ o% I/ R
- if (send(new_server_socket, buffer, file_block_length, 0) < 0)
* q F; r+ @/ f; r6 ] - {* _8 W+ P$ s. s3 n% K% S( k8 E
- printf("Send File:\t%s Failed!\n", file_name);
- G: p1 [5 p' A6 T6 a - break;) B$ U$ w+ m2 [9 {
- }
# D% i/ J9 q% G
' Z0 {' |0 j: M# a" e- bzero(buffer, sizeof(buffer));
( R* W1 C( G( s5 x3 s, Z- W - }4 Q) r8 g, C) u/ a) j( a
- fclose(fp);( v* t4 A5 H2 h0 T
- printf("File:\t%s Transfer Finished!\n", file_name);) M# a# q8 k7 s5 R& }" Q
- }- d3 E1 j. D# d5 S) v* b5 [: O
7 h Y9 e. b& f4 l* n+ Z- close(new_server_socket);: Z+ A* j3 v! w6 f0 A& O
- }
. |0 I: H" c- C3 \, e
" B* g9 I; O1 X; @( q, D$ ~+ s( v- close(server_socket);+ w g# s% y' n* G- ~
, E# ?0 R% b$ G- P- return 0;, n; ]8 z. M/ q& k* Q
- }
5 u% Q/ W5 |2 T - 2 p8 G$ f; Q4 z1 K
复制代码
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