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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.1 [' t6 E6 T, [2 |' d
- /*client.c*/9 V4 L' ?$ T X
- #include<netinet/in.h> // for sockaddr_in 1 n- v; t9 s9 m6 ^- w9 b
- #include<sys/types.h> // for socket + P9 `% K H' h1 Z$ v- U' R
- #include<sys/socket.h> // for socket
J( J: W P' ?& d6 |2 E - #include<stdio.h> // for printf
( a3 _# G( E( }7 N8 P/ k# Z w - #include<stdlib.h> // for exit ! V( V1 r% s2 T1 n# d' x3 M8 [
- #include<string.h> // for bzero
) x! M# k2 E U4 U! r! d
; T" q9 K- }' ]& A! ]$ E- #define HELLO_WORLD_SERVER_PORT 6666 + ?1 I2 u! N4 J5 {! H; J$ S& [
- #define BUFFER_SIZE 1024 ( w+ r. T4 z' X& Y8 F% M
- #define FILE_NAME_MAX_SIZE 512
" \. |5 a$ V1 z - " ~& _ @9 g- b9 y) Y" P2 y
- int main(int argc, char **argv) # }' `1 ]& G( D' O9 ]
- { - Q" B9 m* N9 ^- w
- if (argc != 2) & u9 m2 M- G: N
- { 5 T* [7 B5 y( l i3 W' @ c
- printf("Usage: ./%s ServerIPAddress\n", argv[0]); 9 \6 c- P7 h2 @# m: K1 m/ y
- exit(1); ( }5 f7 D& h$ \% `5 {3 Y
- }
( p) V. T9 a: C$ p% c+ t" x
: B+ J9 j2 N7 F$ j* n) L2 C q- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
/ s0 P+ A* N4 Q5 p" g+ j3 D - struct sockaddr_in client_addr;
6 b2 A+ j; w3 P! m' T- ?* u! Y' n+ K - bzero(&client_addr, sizeof(client_addr)); - z* D6 s6 v1 Z; z. i: x" G+ S
- client_addr.sin_family = AF_INET; // internet协议族
# X0 E) r' |: k' ~ - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址 - R4 R/ q7 ^5 y/ A" i
- client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口
) y n6 |0 C7 L& }/ G0 a- ~
P1 f* n4 o Z1 D% R0 P |- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
9 {, O1 Q6 o" `: L) j) ` - int client_socket = socket(AF_INET, SOCK_STREAM, 0);
2 I' N, a" `' C! \( J7 A, R - if (client_socket < 0) ! ^4 ~& s6 [! a) n5 v
- {
/ B1 i8 e% I/ N0 K - printf("Create Socket Failed!\n");
) g h* a9 a# w2 p, R% C# Z - exit(1);
+ q/ V% f6 L$ X5 m* J2 w$ y - }
7 w7 W5 |; j; b- Z0 w8 h - ( `' W( S7 m n' O
- // 把客户端的socket和客户端的socket地址结构绑定 . \) U' Q+ v" j a. ~4 W8 Q4 J
- if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr))) 5 ^9 s# a" B I: |/ v' y. b
- { # m H a' i" @* I. e3 s$ c ?+ J
- printf("Client Bind Port Failed!\n"); 7 _6 g3 E3 H4 I t3 } w& u, c
- exit(1); E0 n8 J/ b, ~0 k3 C* G7 K1 k
- } , \' h4 N! s4 F7 S/ V( _$ x I
# H( \+ i+ |) c$ k& `8 b. ?' m! z- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口 , S. A# U, ~) q6 q
- struct sockaddr_in server_addr; $ O( Q3 _* A9 V4 k& y6 C3 G0 S
- bzero(&server_addr, sizeof(server_addr));
" C. M5 s' E y, O* Y# O - server_addr.sin_family = AF_INET; 2 K# t; H z' q
- * _2 i# M0 C/ ~
- // 服务器的IP地址来自程序的参数 % d! L1 g8 `5 ?" J8 i
- if (inet_aton(argv[1], &server_addr.sin_addr) == 0) : G7 V6 I/ C) q% x' \( P0 ^' Q& ^
- { " t* `- ^0 ]& N4 m
- printf("Server IP Address Error!\n");
! y3 a. m) ^& z0 D+ \ - exit(1);
3 E) y4 E9 [# b" f5 D - } # E6 v" ?9 X- K- u& y5 R: U# [6 t
- 7 z a" W/ O- ^% {) e9 t
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); & `$ B+ ~' D$ ~! t
- socklen_t server_addr_length = sizeof(server_addr);
) O; c1 Q! i! U6 C6 m8 S+ x
; O* g+ h$ g/ m) E4 l, u$ X- // 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
" R4 f1 P5 S' M2 c; k) N - if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0) $ `% P" g7 H3 \. x, x1 A1 j7 G
- {
! E+ Y' i1 d, m. J - printf("Can Not Connect To %s!\n", argv[1]); ; w- U2 A- b! h+ @
- exit(1); 4 Y, Y5 Q" t: K" h5 q0 o- k
- } 3 l' y( {3 ], b
- . a5 l, N- c: R7 b7 M8 [
- char file_name[FILE_NAME_MAX_SIZE + 1]; 4 j2 @$ k3 Z$ I- k3 V5 p' f( }
- bzero(file_name, sizeof(file_name)); ! g9 ^& |: [+ J3 t% S4 L& q' J
- printf("Please Input File Name On Server.\t"); " S: l0 U% h' }' L6 ^" x9 A4 v0 p
- scanf("%s", file_name);
( s9 ~( q* O( B* \* h1 j - 4 T3 d" b; ?& M5 `8 \
- char buffer[BUFFER_SIZE]; [5 u. p" o# M) Q
- bzero(buffer, sizeof(buffer)); " U! q/ h, j) f
- strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));
1 F( [7 M) S* @4 x - // 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
. U' i' m' x2 k% |! N; q4 c* | - send(client_socket, buffer, BUFFER_SIZE, 0);
, _3 a" c! g3 A
" y$ a8 \: m' a' q, \. l$ \- FILE *fp = fopen(file_name, "w");
4 O' G/ }; J6 U$ J- t - if (fp == NULL)
& j% M. K+ {- G" N' g7 ] - { # _7 b, H: B, Y- }8 V( A) F
- printf("File:\t%s Can Not Open To Write!\n", file_name); & \( F5 k. Y0 f) c1 q1 d3 S7 [
- exit(1); 9 r% m" ?; f- q1 Q. w
- }
- G) ^4 _! Y5 [. p2 y5 C* R6 X
! Y1 I: B" w# W. l8 }% @- // 从服务器端接收数据到buffer中 3 j- g" z" v, x+ W0 S6 H
- bzero(buffer, sizeof(buffer));
7 e, u! q9 B: o, h! e# `& u - int length = 0;
/ r3 X, b% u* n - while(length = recv(client_socket, buffer, BUFFER_SIZE, 0)) 0 B1 W0 G% I" a! u
- {
: k$ K9 j+ i( N' o/ c7 F - if (length < 0) ' |! m7 ~& A. ]7 T& [
- {
, {' ^, Y" x# o0 m" K) r5 f - printf("Recieve Data From Server %s Failed!\n", argv[1]); / I) H" M- M6 T
- break;
9 A; {% i# W: `7 g5 u# d% f - }
' d, ]: j- v) l% A4 o; Z; C - ( O% v) ~% n% a% a" B3 A- M. s
- int write_length = fwrite(buffer, sizeof(char), length, fp);
# f! w9 S2 y9 R( E( b Z - if (write_length < length) / p- Y* X8 ~& V/ l+ ~" Z' G
- {
* \# ]! |6 k. r4 C# E- R1 Z' H - printf("File:\t%s Write Failed!\n", file_name); 7 l/ y6 M5 q3 r% g
- break; 0 G4 H$ d* |! i3 P0 `; X
- } 5 P: G4 `1 d( s6 T8 g p4 b$ @% }
- bzero(buffer, BUFFER_SIZE);
1 J( k8 D4 o9 K5 o1 V( f - } 1 c8 R2 c# Y& J9 y- d
- % x$ [+ n8 h/ o r/ l5 Y% i
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]);
" ^. i Y+ v9 [5 u - }. M, }, q8 h$ x7 m
- // 传输完毕,关闭socket
) G8 {6 l9 X- p7 v - fclose(fp);
) N1 e* G7 e; ^( m0 N/ |* S - close(client_socket); % j) i1 m. s# t4 v1 Y) ~. d
- return 0;
* O1 b z+ m$ M. P- I0 _
! `) q. I; C7 b2 j8 I% e- } * ~) @ r2 @, t. @
* R3 X7 z% [' i5 Z$ x1 E
复制代码- /*server.c*/
- B0 F8 z/ z8 ?: w - #include<netinet/in.h>( \& W4 T6 O" ?& ?+ a6 f
- #include<sys/types.h>
6 m9 i z' f& k7 T/ z4 a - #include<sys/socket.h>% X4 m( l1 z8 {* V
- #include<stdio.h>
. L& X+ o4 \8 \ - #include<stdlib.h>% b! Y, K: o# [2 r* D0 T
- #include<string.h>
2 Z6 ^# [1 l7 v( I2 U5 w - 5 W# t! g' g( s; j! e0 P
- #define HELLO_WORLD_SERVER_PORT 6666 //端口号
6 H7 h) z- }; K+ d0 h - #define LENGTH_OF_LISTEN_QUEUE 20
( h: D( [3 S1 l7 }% U. w/ l* Y - #define BUFFER_SIZE 1024
! w$ q( m' N, x. A! T+ K' L - #define FILE_NAME_MAX_SIZE 512( d8 T) Y7 g8 V ]5 e% ^! x( M
- ! [. n1 m; B8 D9 R4 N
- int main(int argc, char **argv)) U7 X7 r; C8 U r; L8 f
- {
( z/ y5 E! _/ ]" M6 I - // set socket's address information
& J# b7 }* E" M0 s% k - // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
7 f# z5 G$ I% {0 _& D b& R) ^ - struct sockaddr_in server_addr;
d% N$ E/ f) z4 ^ M - bzero(&server_addr, sizeof(server_addr));9 ]7 t1 G6 N- i
- server_addr.sin_family = AF_INET;
- e% ]* Y) g0 U m; t) J - server_addr.sin_addr.s_addr = htons(INADDR_ANY);: H, F, p0 l# P q
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
: D( }0 _+ J( u" x
" D- o* {/ ~9 w) c( ^" M- // create a stream socket
0 D& ]5 \; H4 W- Q1 l# ~0 T - // 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& c- w5 v* x- A; {
- int server_socket = socket(PF_INET, SOCK_STREAM, 0);
/ r3 V" ~+ F* C& l% J: Q- z; q4 D - if (server_socket < 0)
1 V# X( i, q5 S' X - {* q% W9 W5 ]9 V/ t
- printf("Create Socket Failed!\n"); j* d0 S% |6 u- t
- exit(1);! ?* u6 b4 J T9 V0 Q& J9 J7 _2 B
- }
* p( @+ j: j" O! D: W - ( U4 v( [8 `, ~( s
- // 把socket和socket地址结构绑定. @# R% b# z3 {# ?0 q! B+ g% c
- if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
5 r( j* B( j4 W1 j, K U - {( Z7 S" S6 o3 K) `1 D
- printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);1 ?- t" r3 m2 y, H
- exit(1);
$ l" A& ^* f/ F8 o5 ~ - }
5 t; l$ o! s7 i1 m. O1 x - ( J% Z- L9 b! K' j, x8 A
- // server_socket用于监听 P' _. P% m' |- E+ K
- if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))3 `( B: t( N5 ?4 c
- {; A$ Z& p* I7 _9 x" W
- printf("Server Listen Failed!\n");
* F, C/ G% I0 { - exit(1);
9 c; A R2 L+ \5 O - }0 N& P, E2 X0 u% n1 Y. v- {! k3 C: J
& S) `) A9 y/ y7 H9 D- // 服务器端一直运行用以持续为客户端提供服务 { Q( i: [ P; r7 T, f* c
- while(1)
- m$ ]/ `2 r% ~! ~6 o/ ? - {$ E: j; ~- r- V/ ?! f' V! r: W
- // 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accept8 }1 m' Z6 `/ P# }# g, k2 T& ~
- // 接受此请求,同时将client端的地址和端口等信息写入client_addr中 ]3 l2 p) T1 ~1 E e, G
- struct sockaddr_in client_addr;
. }! ]7 M; |4 x3 ]( Z# k - socklen_t length = sizeof(client_addr);
* {' m4 F4 x2 W, ^. E+ M
% z {8 S9 G. n5 n- // 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
- v0 P' I, D1 v4 Z" o. 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, W, G9 k7 t7 n U. r$ W
- // 用select()来实现超时检测
9 d8 q3 b* b/ E; c C d - // 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 Z& C# ], a+ e4 t+ ~8 K l - // 这里的new_server_socket代表了这个通信通道
% @2 W+ \% U& M1 i% I$ o - int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);9 J s9 S5 w$ F: T9 B
- if (new_server_socket < 0). p9 z2 w; }# x* C& ^1 s
- {: w! m- j$ a( B/ X( J) t
- printf("Server Accept Failed!\n");$ N5 g9 i5 x( j3 I. [+ O' ^
- break;3 {, n* n2 |5 l/ E/ R2 i
- }
# q5 h X, I( F6 o3 A* a
; r/ V( s# `4 Q0 v7 q; x" o4 Y- char buffer[BUFFER_SIZE];
1 z+ E' s/ u8 ?; e) `* ^0 u3 V - bzero(buffer, sizeof(buffer));& H' m- f5 i- q7 ]5 x
- length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);( f b8 }( j) ]8 J
- if (length < 0)
. t0 }4 _9 Q- v/ n% O5 F7 Y" i - {
* W# i1 U6 H$ s5 {0 \$ q - printf("Server Recieve Data Failed!\n");
0 b% y e* o+ R' {/ X$ t - break;
/ \/ T1 Z, F5 R" H- j7 B - }
2 G n. r! E1 C% f5 ^. L - # R9 g/ H( A% @: a6 B
- char file_name[FILE_NAME_MAX_SIZE + 1];
6 L" n5 H' U+ P; F1 a- n ^ { - bzero(file_name, sizeof(file_name));
" ^7 s* d; z' D- L9 `2 v2 m - strncpy(file_name, buffer,7 O2 H- `% }2 L5 \
- strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));
N$ T5 ]% K w" m3 ?1 j - ' a1 @- y3 ]% F+ B/ c: [
- FILE *fp = fopen(file_name, "r");
( E( i. y3 ] D# f; L& `1 q - if (fp == NULL)
9 |1 o3 E) n, |" M- ], a) S - {
- O4 [' x" h y) B$ O - printf("File:\t%s Not Found!\n", file_name);
( D! q5 n' g' b; h - }# v) j6 @* h; ^# ]. J: k
- else$ n7 j; F5 L0 v% l w/ Z5 p2 i: P& y* O
- {
0 r2 j8 W7 Q; b; s5 ^. D - bzero(buffer, BUFFER_SIZE);
# b3 m: Q- F8 i - int file_block_length = 0; Q. z @- @% Y) u( U% K
- while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)( H0 e. g. s, U) c5 z( u7 l
- {' q1 h' M+ h. e7 g! D
- printf("file_block_length = %d\n", file_block_length);
8 L. |3 n" V7 x" E
4 C2 V J5 E' Y: O- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
3 {$ k: B, J, C# t' ?1 ]+ ~/ | - if (send(new_server_socket, buffer, file_block_length, 0) < 0)0 O/ b: m9 A0 @ f! z2 F
- {
6 X3 x9 X4 P" T e# Q - printf("Send File:\t%s Failed!\n", file_name);
* }( @7 {) L! J - break;( v) T$ m1 E% ]/ e& [/ ?7 i3 f( M
- }
; o# a( ?- n4 j4 _' g% p# p7 g - % |% P' u- b- m& }
- bzero(buffer, sizeof(buffer));- ]/ ?! v5 n! @% \# a
- }+ i, F9 h1 X1 s- S* p" |3 C, b
- fclose(fp);
; u! k5 ]# E: { n8 d& Q - printf("File:\t%s Transfer Finished!\n", file_name);7 R M A) v2 M& f/ A6 S. A
- }+ k% o4 ?( { [, v) g
- + D; n, i0 h6 o! }, l
- close(new_server_socket);- g8 b# {3 M: N1 E( E2 q
- }
$ b' {6 d- q, ^% b, `) P - 7 q6 c% D( a! a8 @. J, n, v
- close(server_socket);( n6 I0 O7 n( q7 {
- - p& N% y& j$ a" l
- return 0;
( E5 d% {# s) \9 ]7 P3 s - }, @. k1 l0 g! j9 Q6 z
- : L4 w- Y/ b' r
复制代码 4 s0 D5 D% d" e" E# t% m5 o
: Y1 l$ @$ y0 E: x/ F% o; s! I# y
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