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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 E8 {% B% F' ^, @; W
- /*client.c*/9 d# h' P/ f. u. x: J0 P
- #include<netinet/in.h> // for sockaddr_in # P3 w& r' @4 p9 i7 ^
- #include<sys/types.h> // for socket : k5 a, b6 G# ]) T7 Q
- #include<sys/socket.h> // for socket % Q% L: [+ V: G: ^
- #include<stdio.h> // for printf
# E7 Z/ H- Z3 o k' C - #include<stdlib.h> // for exit
U8 `- [5 f7 {5 Y ?9 A! N - #include<string.h> // for bzero / r" e& ^& i! n7 O! p0 }5 o
- 7 y+ U- G. e7 _
- #define HELLO_WORLD_SERVER_PORT 6666 & W: j* O9 {6 u, c
- #define BUFFER_SIZE 1024
0 x/ a% j, ]- y - #define FILE_NAME_MAX_SIZE 512
+ d. {# `% w/ X _" D - " h" O; c. a: R! o% J
- int main(int argc, char **argv) 0 h5 b$ v7 {' c$ w& A
- { . e9 x1 Y( A4 ]2 O+ b# c3 f
- if (argc != 2)
; s6 E' N9 }" S7 W H - {
: n# M) p8 F6 P8 o1 M( t - printf("Usage: ./%s ServerIPAddress\n", argv[0]); - p: P* J c% d% X
- exit(1);
2 e' ^2 r+ ^3 g- T/ v1 ]" {8 ? - }
! X! ?: K7 S- \- r
9 }" c4 R% V0 Z [% g9 W* n, y7 O- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口 & B# W [+ P9 \5 `" X6 l
- struct sockaddr_in client_addr; 1 ^2 k6 D0 Z( N- g% s H5 p' ?
- bzero(&client_addr, sizeof(client_addr));
% U4 V0 C% K+ z, H0 O$ a+ X - client_addr.sin_family = AF_INET; // internet协议族
) J3 W* I; Q1 \% T - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址 8 W% |# ~: Y; Y
- client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口 7 r2 {+ u& Z5 a4 E
- ! L: `' S' j7 Y9 k/ v1 O- k/ ]
- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
+ a1 c0 _/ G: Y! F - int client_socket = socket(AF_INET, SOCK_STREAM, 0); + b9 g3 v0 Q0 H- p- p! _- @$ _5 V9 Y
- if (client_socket < 0)
+ U- w# M1 A9 x; z. q0 p - { 8 O* @7 b; i/ \* z, O1 M
- printf("Create Socket Failed!\n"); # M" t; z/ B/ c; ]' `1 |
- exit(1); 8 w4 w1 J6 c9 q+ S# W! u
- }
+ f- M( i2 l& G2 C- r1 b- \
0 n6 p: T- k4 B) }4 z- // 把客户端的socket和客户端的socket地址结构绑定
! j' i1 R; w4 R - if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))
* Q' a; N6 D# L# h j- x - { % x0 m+ b- G9 n5 G5 g
- printf("Client Bind Port Failed!\n"); m- ]8 u. `. [, o* ~7 q3 r: Q
- exit(1); : l L. a" E$ }' [/ g
- } i1 c0 N1 }8 d
W- s9 ?: ^* \9 K1 t1 ?1 C7 a- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口
& ^9 ]$ N% f8 n3 A, y - struct sockaddr_in server_addr; * ?: H* R& c' G( d
- bzero(&server_addr, sizeof(server_addr)); , M O* @8 ~7 x
- server_addr.sin_family = AF_INET; 0 |8 |& r' {( B6 o1 E
8 w; k1 R. u; b: N! c# a, b8 A- // 服务器的IP地址来自程序的参数 3 p9 N; h4 e1 e. K5 O
- if (inet_aton(argv[1], &server_addr.sin_addr) == 0) $ i, z* }" {/ c4 x( I
- {
% n7 S! [7 n( h! o8 M9 S9 }+ w5 ^' }6 E - printf("Server IP Address Error!\n"); . O! P' {3 F/ w1 a2 }7 P
- exit(1); , h) W, w% G/ d3 v9 Q3 E9 ~
- } & o% w+ C, N3 R* ?% F; g! j
- ) z' c; O- e1 U4 {$ ^! x% D
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); 1 v! ]7 D9 x6 e* `
- socklen_t server_addr_length = sizeof(server_addr);
4 x, E$ p7 s3 i1 G0 _0 N - 5 l/ j; r* z( l3 N K( {
- // 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
, V) T+ v7 r8 I5 A9 @ - if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
3 N3 ], O a! O5 ~, [- _ - {
; R. J4 U' C) b) v P - printf("Can Not Connect To %s!\n", argv[1]);
$ o: _ V0 @/ Z9 Q* ^ - exit(1);
8 M: G; q4 t2 ?$ n( n - }
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- char file_name[FILE_NAME_MAX_SIZE + 1];
- F r, Y; h0 K* @; d( m% T' ` - bzero(file_name, sizeof(file_name)); ) F! Y f. @3 V9 n* j
- printf("Please Input File Name On Server.\t");
. `3 _. q0 e7 n7 T k) k: G( j$ R$ K - scanf("%s", file_name); 8 }8 B K; j* s6 n! B f
" p H T" b a8 Y- char buffer[BUFFER_SIZE]; 0 [4 @& n1 d; p( U1 ]1 g( `; D
- bzero(buffer, sizeof(buffer)); : L8 l3 `/ V" q# m ]
- strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));
' p" l" {) Y+ Y5 q2 l1 P - // 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 5 L* { ]& Y! N( q' B3 F
- send(client_socket, buffer, BUFFER_SIZE, 0); 5 Z$ L3 A y* ? Z O- V
8 d |5 \- w# q, Y1 C- FILE *fp = fopen(file_name, "w");
" `+ _: m" F [ - if (fp == NULL) 2 _+ Q, ~9 s& m: i$ X( q
- {
7 k5 a1 l, }" ~2 G6 o - printf("File:\t%s Can Not Open To Write!\n", file_name); 1 R0 X" Y2 m! c2 x" j
- exit(1); 8 ^4 t6 d/ t5 X
- } 5 N! _2 N% G& T" O) ~0 ~
- 2 P# f4 s/ h! M8 n$ N
- // 从服务器端接收数据到buffer中
7 w+ ? J! X: p: b- y - bzero(buffer, sizeof(buffer)); 8 d ?( G: Y/ |* ]; K' V4 X
- int length = 0; % L) s ^% o& e3 W$ c; s
- while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))
1 [/ F* E+ w3 ]8 R# C( L - { _: L& n( q2 {) F; z+ u
- if (length < 0) 7 o: T! J2 a0 u7 ~! w
- { : q1 |+ B5 z9 L( K
- printf("Recieve Data From Server %s Failed!\n", argv[1]);
1 T5 B- C* ^: f. @9 R" r2 X - break; ! o1 E: g+ s; d: G" V/ I5 w2 R7 q& [
- }
: V c8 u# E1 [. o) a# K
: |. i* [9 m& y* X' z6 \! ^3 a- int write_length = fwrite(buffer, sizeof(char), length, fp);
]1 z) f. p" @ - if (write_length < length) . q, U5 w) u1 l1 q) r8 Z
- {
4 ^+ f' A% C- w - printf("File:\t%s Write Failed!\n", file_name); L! w c( P' m% T
- break;
5 e2 W, c3 W9 R c! l0 Y' h - }
# x7 ]& h3 S8 H S - bzero(buffer, BUFFER_SIZE); ! ]2 b6 h/ J. |0 B
- }
7 o: b9 ~5 W# S' ]: F/ y - % P @* S. M% D/ [2 O* h
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]); ; k6 Q. M5 m& X) e* I5 V
- 2 ]8 h2 t4 S7 K2 s5 O6 Z& V8 k! D( s
- // 传输完毕,关闭socket
( U! l% M6 a+ f' d$ W8 L" D, P - fclose(fp); + g0 h' x! _2 P8 K+ h8 w2 q: W
- close(client_socket); ) d7 ]1 r/ E* C$ ]# e+ ?8 z
- return 0; $ n# { F% P! B% A( z
- : A8 [4 Y0 L* L4 w
- } 4 ^, ~% Y6 d) A: w8 i
5 ?$ e! z7 v* C5 d' t; ? e {
复制代码- /*server.c*/5 [# J- I5 j" C+ r3 Z+ _2 S
- #include<netinet/in.h>
- ]+ K0 S* J/ v3 \ - #include<sys/types.h>
* H" j, z$ d. X+ q6 Z! q - #include<sys/socket.h>
1 Y n8 e/ d6 r" i, E$ V) o - #include<stdio.h>( ~# t+ _2 ?! K5 J0 e7 d: [
- #include<stdlib.h>
3 ?# O; \/ w6 N - #include<string.h>
, @: N( v1 M. N2 H1 X2 g4 w |& b
" i6 {+ V X$ ^# a/ h. j# w* O- #define HELLO_WORLD_SERVER_PORT 6666 //端口号
' m) C" X& `& O) v' u' \ - #define LENGTH_OF_LISTEN_QUEUE 20- I+ E2 b. U0 l9 ~+ k5 j% Q
- #define BUFFER_SIZE 1024
+ ?+ y% P+ c1 [ - #define FILE_NAME_MAX_SIZE 512
5 e$ y" z( _2 l$ v9 }; ? - + A7 h1 Y/ B, V. s1 O
- int main(int argc, char **argv)* z# j( H* a9 O2 }6 k. K: \- ^" S
- {
8 N& t/ Y% v4 r# N - // set socket's address information
, P8 ~: G4 C' H0 C/ G+ d9 f7 A - // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
8 R3 d& a6 z5 n) w5 g3 j3 U - struct sockaddr_in server_addr;3 b: d" {. A- k8 y
- bzero(&server_addr, sizeof(server_addr));- l- `9 o9 d2 f3 M8 J, Z/ v
- server_addr.sin_family = AF_INET;
& O9 U! T# a# k4 t* \5 ] - server_addr.sin_addr.s_addr = htons(INADDR_ANY);
8 U: n% j( Q. ]) a! [ - server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
# G" J4 T/ s4 Q2 V/ n - ; _' L& K' ?4 ?' m' J4 h
- // create a stream socket8 U1 R3 P8 c1 K; i& z0 i2 f5 j
- // 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
8 o8 O6 s) @6 \; o - int server_socket = socket(PF_INET, SOCK_STREAM, 0);- G- P2 X2 \4 E) L9 a* z
- if (server_socket < 0)
1 x% @7 _3 u6 m% h5 I3 J5 z$ g( \ - {
+ Z4 j% d9 I3 L4 z9 Q2 x4 T, I. Q5 ` - printf("Create Socket Failed!\n");
. r0 y9 i( y% N - exit(1);8 l& T6 I" w8 I! L
- }
! ^) S7 y* D: B( K - / l+ ~/ p6 T, U; c H- @) y6 ~- i% M a
- // 把socket和socket地址结构绑定
0 f2 ^: |$ `- D( `8 d O - if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))0 K6 m; W! t I( v6 s/ z7 B/ d
- {4 }' K9 Q l0 E) _9 e' i
- printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);8 E2 Q5 b0 o% r$ A/ _# b! k; e
- exit(1);
3 Q5 {7 a8 g2 T5 X- f8 G - }
! c- M, y; E! \* O: I# y; m - 3 }) N1 t6 N1 a, G, P
- // server_socket用于监听 G% Q; L# s2 Q
- if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))6 A7 A& Z7 D9 `- n5 P
- {' s9 P/ I& v+ L3 q
- printf("Server Listen Failed!\n");
4 f- @+ G/ n1 D - exit(1);
. ~% W' ]+ @9 d. i - }
9 T( R- c+ V F' L4 c
2 B- q% M8 w- o+ o/ ]3 H- // 服务器端一直运行用以持续为客户端提供服务% Y; x; p- u1 F9 ?9 n' e
- while(1)
# v& E0 |1 Y. I - {: w: p9 M& l0 C' v2 d! z, c
- // 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, b- v9 d) H. I/ }3 b* E9 W
- // 接受此请求,同时将client端的地址和端口等信息写入client_addr中
* H" q) J9 R0 o6 F' `& X+ ? - struct sockaddr_in client_addr;9 p2 ~, J3 V6 H4 P4 i- }5 Q) G) d
- socklen_t length = sizeof(client_addr);
' p& R% I% {; w4 |- Q
& {+ P, x9 Z8 D9 \. H- // 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% ^9 k) e- m% o6 p) A2 i$ W! 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
2 r4 o8 t& |% k8 T - // 用select()来实现超时检测% {3 E6 m3 |1 O# ^
- // 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
3 {1 O5 I2 d4 j; Q' L; j - // 这里的new_server_socket代表了这个通信通道& c- |1 n: y n3 R
- int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);+ K( z( \, G' F( X) I2 J) Y
- if (new_server_socket < 0)
1 X1 i- u+ w. h7 F - {) { H0 `" W5 {+ t4 N
- printf("Server Accept Failed!\n");, R, Q$ w6 F h$ A" X4 X# E
- break;
: I# ^/ O$ I- t9 g7 ^, X- \ - }7 t7 P5 L3 p3 x) z/ Q
( D$ j, D' `/ Y! S0 [- char buffer[BUFFER_SIZE];
. L `' A% J0 [6 c3 ` - bzero(buffer, sizeof(buffer));4 Y' J4 d3 g/ ]
- length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);" G& p* J& J2 C9 x8 j
- if (length < 0)
. W3 I- P: M1 S5 d( _; j7 c3 A - {
* v7 j8 J1 N% Q# O8 C- W9 l6 R - printf("Server Recieve Data Failed!\n");+ y7 `+ ?6 q* L' f
- break;
; C! L4 w) Z$ D5 u - }1 }! D/ w5 }. b3 [" t K
+ F z6 {& d+ e* j5 }2 W/ d- char file_name[FILE_NAME_MAX_SIZE + 1];* Q9 m# T6 K! ~3 \ J
- bzero(file_name, sizeof(file_name));
+ k6 s7 P4 U& ]& S! r6 p. k5 g/ h' h - strncpy(file_name, buffer,
5 g/ ]. s. G* D/ p' r* I, i N - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));- D5 i# R+ H7 v$ |0 m \
- 4 l! c" H5 ?6 k) Q( c
- FILE *fp = fopen(file_name, "r");6 H/ n' @3 B$ {# w1 m
- if (fp == NULL)% B% k! S% s# s4 O. S4 J& D
- {, e( ^6 G c1 [' F. `
- printf("File:\t%s Not Found!\n", file_name);9 M6 B: y. w5 b; d5 |
- }8 D F; o. y; m& `) ?1 v
- else
; g9 F6 g1 S' F; G4 M - {
3 \" R3 x' p* }7 J - bzero(buffer, BUFFER_SIZE);
9 Y$ ]. o' n5 j, c4 r - int file_block_length = 0;
9 X l8 I: d/ V& M$ P! m - while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
@7 H3 x; C/ J/ ~) g Q - {
# U* x7 m0 u r% A6 _! u - printf("file_block_length = %d\n", file_block_length);$ o# ?- b1 P( o) [2 t! u8 q" P# N
- % J J' e) g% C- r3 e
- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
& Q( a! n2 o: z+ I9 ]; ] - if (send(new_server_socket, buffer, file_block_length, 0) < 0)
4 R P' Q: p; C( {# c8 Y5 f - {- ~! r& [/ |# g! {1 l- }9 y# Z1 u
- printf("Send File:\t%s Failed!\n", file_name);( W* O% u9 L# I
- break;: V0 W6 }, [" X, B2 W
- }, a# \+ k5 n: n( V( v
4 c9 I9 I, b# B* L( ~- I' A( f- bzero(buffer, sizeof(buffer));8 y8 g" M2 ]7 w" [
- }1 T) ?9 ^8 E4 W& e/ M& n: O3 }5 b
- fclose(fp);) X9 ]' @- }: g: L$ I
- printf("File:\t%s Transfer Finished!\n", file_name);0 U) I) Y( U% W& U- I
- }
6 X: H; r! Z4 \* b, P+ B3 Y
/ G, i0 ~- b* b$ x Q& ` D- close(new_server_socket);
; L7 v! j) Y. t q4 G6 } - }$ I/ U: S& I8 A) E8 }; U
- ) T9 p7 e6 D$ Y# C3 `
- close(server_socket);
3 s. S/ F* ]1 f* [% k/ r4 W - Y, ?5 B7 c: ` D
- return 0;3 m; k" j3 C0 Z* J4 O
- }$ u* G4 k+ X' Z* z; X7 h
- 0 P( D6 |9 W. v- r
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