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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.
z* F/ t1 M" L" e; P. A- /*client.c*/. s- I( e* t1 P- w( z
- #include<netinet/in.h> // for sockaddr_in 2 q( `1 D: G1 z6 \. m7 N) M
- #include<sys/types.h> // for socket ' x {8 w3 N! O! }+ Y
- #include<sys/socket.h> // for socket 7 O# i5 c. m4 P
- #include<stdio.h> // for printf
+ Y' ?5 J/ r3 f - #include<stdlib.h> // for exit
& [0 i7 I% I+ K2 x2 L( W6 } - #include<string.h> // for bzero
& I$ E$ K, F% i3 C
+ Q0 d' ~6 A7 B/ F4 i! V- #define HELLO_WORLD_SERVER_PORT 6666 " _1 I1 l5 L! @4 g* D% k- m/ Z
- #define BUFFER_SIZE 1024
, W0 }7 ~7 k- J l8 y7 ^& J% } - #define FILE_NAME_MAX_SIZE 512 & \8 G' N) ]# Z( _/ s
- / X; U3 n: Y9 b, L% Y( A. u
- int main(int argc, char **argv) 2 c: e' y) E7 q
- {
' g) R& g3 t1 [" \- m4 x - if (argc != 2)
* @* A) Z) V7 `- i - {
) B" C( T4 F9 }5 }. o. Y - printf("Usage: ./%s ServerIPAddress\n", argv[0]);
. I6 |3 m$ d% W) v# l - exit(1);
" r1 e6 K+ V) \; k" @9 `. Y/ a - } 8 `8 c. h$ g, }9 U! p1 E3 u
]* |9 K( s; a$ y! s! N6 _" a- T- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口 , X F" A! G7 f/ [8 D
- struct sockaddr_in client_addr; 1 W- K4 w5 c; C% b# d
- bzero(&client_addr, sizeof(client_addr)); 0 l8 X2 w! f( N
- client_addr.sin_family = AF_INET; // internet协议族
$ w% c6 ?& N" ] - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址
" o# M/ S) Y7 R& r7 D$ w& N- r. n - client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口
9 ~* n o6 G4 K- q, X j8 L
3 ?! L% i+ G& b7 f0 V& L- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket ' u' B4 Q# W2 A
- int client_socket = socket(AF_INET, SOCK_STREAM, 0); + \" r) G/ {; r1 F3 D. t
- if (client_socket < 0) # J5 e; a# h( X$ K. t Z8 l
- { / v2 x. {9 y, m$ x. h/ `6 M
- printf("Create Socket Failed!\n"); ! r) w* @0 }' n7 A
- exit(1); ( h2 `3 _, O" v- n7 H4 s6 k# ~
- }
0 d4 F; D6 T9 ` j- v
% \/ b" a# J j% Y- a! S- // 把客户端的socket和客户端的socket地址结构绑定
+ E& L3 R5 L9 C9 W: m5 q - if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))
' B8 [) g$ D/ m4 {. k* D - { " h3 h- K% x; A: l
- printf("Client Bind Port Failed!\n"); ! K0 }% L# [, M; s
- exit(1);
, s6 `$ P- m1 t) f - }
1 j) c, B8 R) p, ~ h7 t: s
4 l* q% C2 p, U( _' `, k) z- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口 ( w, C! S/ X$ W
- struct sockaddr_in server_addr;
9 p3 V: N0 x/ n9 J - bzero(&server_addr, sizeof(server_addr)); # a! t, W. Y A" ^' O. e
- server_addr.sin_family = AF_INET;
% P2 \" b" d) ?" Z+ D% I: |2 b - 5 p, O4 C3 W; t# D! I
- // 服务器的IP地址来自程序的参数 7 e. Z. K5 P3 w1 s% ^
- if (inet_aton(argv[1], &server_addr.sin_addr) == 0) 1 G8 S" ?$ S& T; J0 b
- { ) V" l; b! k* g7 T) L: X }
- printf("Server IP Address Error!\n");
: Z$ o, |9 A+ e2 `* S - exit(1); & g: p4 C. ^/ h! Q4 @
- } $ h& h1 h+ j4 l m
! b+ t! T) `$ Y% y( w. c& K- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
- |' Y1 n0 x# s) I: K0 E% y: m - socklen_t server_addr_length = sizeof(server_addr); 1 W: x9 [9 a" W: j9 h7 Z
0 {: q/ {3 H% O$ A8 U4 f+ E- // 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 * F2 f' r7 g' E" b% p, w/ }$ F
- if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0) * Z! J$ u' N: m
- { 8 f8 V% w& V$ G" q
- printf("Can Not Connect To %s!\n", argv[1]);
# L" y/ G9 y7 C) N5 |5 l' { - exit(1); 2 v; ^; j0 r* R% H
- }
) w# j( h2 _# m" B# H - 1 { @8 F! a: p3 a8 P, p
- char file_name[FILE_NAME_MAX_SIZE + 1];
$ [# ~: v/ r2 k# U - bzero(file_name, sizeof(file_name));
& q8 k( C( j' P - printf("Please Input File Name On Server.\t");
' O. m! n5 M' y - scanf("%s", file_name);
* |4 ?& d7 p% N0 O8 Z7 f4 a& T - 8 |1 b# i. ? h' S4 A- F& G
- char buffer[BUFFER_SIZE];
5 f& v; z v% T4 v1 j% c% n - bzero(buffer, sizeof(buffer));
6 H' N% S9 U7 b! U7 |# w - strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));
" h+ ?* v& |' {/ ^1 y2 I% s - // 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 N+ U& Y" W' V. w2 C8 i
- send(client_socket, buffer, BUFFER_SIZE, 0); ) d7 a/ o h/ G9 i# f [
0 a$ `9 X8 X, p2 J5 i }& J; t3 f, ^- FILE *fp = fopen(file_name, "w"); $ o9 M# C5 H6 v/ e# n
- if (fp == NULL)
& T) R& j# z# m( I8 R - {
( I; i4 M6 o8 @: b, D6 Y% l3 o8 e - printf("File:\t%s Can Not Open To Write!\n", file_name); * [: X! }. o" S- Q' a
- exit(1);
4 ]- g6 D7 c* O" }& M5 o3 V2 h - }
7 n; H! b3 E( u- f - / \( E4 u# o$ z* q1 ?1 p0 P0 K. H
- // 从服务器端接收数据到buffer中 3 `! N1 @7 I- U4 ^' L Y
- bzero(buffer, sizeof(buffer));
7 B$ M. C' T; Z6 t - int length = 0;
% I: A* e2 g% ^& |$ H3 j# s f - while(length = recv(client_socket, buffer, BUFFER_SIZE, 0)) 6 P7 i i% ?! K; T( N
- { $ O" E0 ?4 Z9 z5 T4 G1 p" O
- if (length < 0) , {* p, x, [3 b, o1 e
- { 5 j% C/ ^# n, F/ U! N1 ?
- printf("Recieve Data From Server %s Failed!\n", argv[1]); % }' `5 ^) R- \+ S
- break; " n5 j9 K# l! m; b; y
- } * v# C& _! M0 w7 X* {4 L
( s9 E9 k+ I5 R5 K5 G4 i8 d- int write_length = fwrite(buffer, sizeof(char), length, fp);
b0 ^$ W. v: y! l( m) u6 J6 m: t - if (write_length < length)
* a: u7 }& [3 c2 J$ q7 |3 h; j( ] - { + `' N6 }8 S" w1 ^+ R
- printf("File:\t%s Write Failed!\n", file_name); 6 k5 o) C* c) u1 ] R
- break;
& i( m1 q( o& E i4 f; | - }
h0 ^5 d$ z" Z( } - bzero(buffer, BUFFER_SIZE);
$ d0 _* ]' q% h; s8 }: \8 U - }
/ o: X9 l- R$ Y6 t
# n' ^, t! ]6 n. \' v- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]); ( p9 a0 f# G* X: S. m$ w
- 0 C; }/ B, z3 _) c
- // 传输完毕,关闭socket
" J- f( D6 Z9 U$ @0 ?' n - fclose(fp); ) d. i+ p- g/ r3 B5 W
- close(client_socket);
- k! M1 V9 W, ~- P7 I - return 0; . `% s O3 t& ?- v' i
- - p9 ~3 w8 R2 M) N* M8 _
- } {2 q& C6 h. Q
- 7 m& I* ^: n4 D" J/ e6 Z. `
复制代码- /*server.c*/9 \5 c/ H' m9 O5 k, g- e
- #include<netinet/in.h>
" I" b2 i7 A6 [/ d' O1 g - #include<sys/types.h>
" c) y% b& T& |* ]$ K - #include<sys/socket.h>
2 Q- i. [. W+ K7 c! I( P! F - #include<stdio.h>; W) M6 S/ y5 g
- #include<stdlib.h>
4 M( y3 h: n8 w& D+ c* m - #include<string.h>: U: X- a# Z$ O0 L6 z4 A" M: b a
- V1 W1 K4 i! f5 S0 c: l3 Q- #define HELLO_WORLD_SERVER_PORT 6666 //端口号" d7 F# F. a, R4 W& ~
- #define LENGTH_OF_LISTEN_QUEUE 20
6 D7 V. D0 k5 f; }9 z$ w& x1 W - #define BUFFER_SIZE 1024
. ~$ Q( O Z9 A - #define FILE_NAME_MAX_SIZE 512
( m1 z0 p& W% ?- T. | - ?" C- w6 [: }
- int main(int argc, char **argv)% G( }5 r2 q& g: B) Q
- {& z! n# \9 ^( E- Q
- // set socket's address information/ @6 N* z+ Z( i, u: g
- // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
/ o2 F& A' h' |. h8 B j - struct sockaddr_in server_addr;! O6 f4 e0 l5 g3 G! u2 ]8 w
- bzero(&server_addr, sizeof(server_addr));
2 B# l( G9 a" W, [0 p - server_addr.sin_family = AF_INET;2 T4 a/ J: I* U% ?; A6 t; V9 M
- server_addr.sin_addr.s_addr = htons(INADDR_ANY);
' q+ l* l, Y0 i- G% i - server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);& ^9 F8 | q( B. I6 f& Q
- ( M* K% f1 z) ?+ x
- // create a stream socket
* h) i" R) t1 Y0 L5 \1 } - // 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 e# i6 e4 e- _3 x1 i - int server_socket = socket(PF_INET, SOCK_STREAM, 0);. d; [% x ]* E, x; |
- if (server_socket < 0)* J/ N3 Y& u* H& T" t7 m
- {
! r; E$ N$ M' f - printf("Create Socket Failed!\n");
1 b' X4 n0 R* g, Q - exit(1);1 W$ d: ~3 M: l2 i
- }
1 ` k/ Y) L. l7 t8 b! h6 D
+ v( g" p2 p( R) H* A6 _- // 把socket和socket地址结构绑定
$ y4 r8 X. `8 V/ ]: R0 A6 x - if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))3 t- w7 M- j, I% c7 O
- {
$ ?9 P0 Z; x# ], | - printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);
9 q5 e$ I. h) R' ^. U$ x0 a - exit(1);
: N% N) _' d7 k/ ~% a( | - }
# n) H7 o) E0 G. _$ V - , F' u! O$ m2 r8 d; ^6 O
- // server_socket用于监听7 W, o, |: ^, D! x: E, @9 t
- if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
$ ?% c0 D% J' G* x9 L8 j7 _* c0 y - {
5 X3 x4 X3 l# V( Y$ \, l, h - printf("Server Listen Failed!\n");
7 ~' R, X! p9 {% F4 ^6 [ - exit(1);. T3 G9 F0 ^0 p1 Z' g
- }; C' a/ t5 F, j8 d
- 4 C9 S& S1 ~7 |" [/ w0 }
- // 服务器端一直运行用以持续为客户端提供服务; Q& m: u) _, x2 L, v
- while(1)% a8 s! M" U: Z9 h0 l$ p" [
- {
/ R, v2 z/ u& k/ G" \: } - // 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
: n3 c4 b1 ? U3 K/ z7 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$ }7 Y! i6 B8 P ] J
- struct sockaddr_in client_addr;" Z# o% q7 t3 T6 }! E2 U) J- w! ]
- socklen_t length = sizeof(client_addr);% v7 }; `; M, i- y6 k7 g# v* R- u: k* D
5 A3 \6 P4 }+ ^6 ]3 m% {! ^- i- // 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
; P9 A+ k) w s - // 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 Z% y6 G' t7 N+ d2 N& H( J
- // 用select()来实现超时检测
1 L/ C! a( m8 g+ S6 X j - // 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
" u. P1 F, a. B+ J7 Z2 e - // 这里的new_server_socket代表了这个通信通道
" }$ G4 B$ @: o7 a - int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);3 w# P! o, K! \* S
- if (new_server_socket < 0)$ T$ P; a' J6 `8 q( o& F
- {% r3 d! i- [3 p+ J' A) o
- printf("Server Accept Failed!\n");3 V7 _7 D7 a f5 ]0 {7 A
- break;0 p$ }; B3 |# B0 g
- }8 e5 E% X5 p# E9 o
- % F, j/ V l* J: \2 R2 o
- char buffer[BUFFER_SIZE];
4 Y* |5 s4 j! W- `! M7 B9 r - bzero(buffer, sizeof(buffer));
4 d1 H, d3 W" f; d1 c' d - length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);
6 u! M( @( g# n9 V9 o$ o7 ] - if (length < 0)9 h+ l) D! k0 x
- {
, e& m! d$ G2 t0 G1 ]9 l8 d" v1 S - printf("Server Recieve Data Failed!\n");
1 s! v- C) |4 F. N - break;3 Y4 g- |5 G5 _& p; ?6 R
- }
. B4 K1 E& x4 N" C4 c6 \
7 Y; t, b4 H" c9 y6 r- char file_name[FILE_NAME_MAX_SIZE + 1];
3 g* Y6 Y! N/ x( Y; \/ w0 g4 j& P - bzero(file_name, sizeof(file_name));! K0 d4 }, K' G: R' f
- strncpy(file_name, buffer,
_9 m) r* \) X7 } - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));* i0 M. S n: T5 i3 {4 z$ z
- . F9 @7 D# {' }! `. A5 `
- FILE *fp = fopen(file_name, "r");
- \# ]& x% o% F8 K: x! ?3 z - if (fp == NULL)
# M: E7 r: X9 ^# Q' P( W* I - {
2 s: H; e$ C! E7 r$ U! Z) \ - printf("File:\t%s Not Found!\n", file_name);
5 ^" D( ? X' C+ U- ^ - }
% @, b, v. s) Y2 S2 }" ] - else
3 W+ f* F @ z6 r9 s7 M - {$ @. }; y3 R a
- bzero(buffer, BUFFER_SIZE);; }; ?4 ?: \" B# x% _5 R
- int file_block_length = 0;
2 Q4 C4 F2 \! @ m1 U. E& }2 a - while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)3 N4 L2 x8 e i/ u3 {& u( b8 H
- {$ l1 C/ u. }5 }! ]$ g) v6 a) j
- printf("file_block_length = %d\n", file_block_length);) f+ @8 }7 W/ x
- : M7 @4 i) P" i: ?2 N
- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
6 x7 |: p8 P6 a - if (send(new_server_socket, buffer, file_block_length, 0) < 0)
$ R# O" Y" C+ G1 d; x8 b - {
' t* K% o1 m6 l3 B* v6 N& s - printf("Send File:\t%s Failed!\n", file_name);' B) ]3 e) n9 Q: D- J' P
- break;
2 d: D3 z& ]! g- ~! F: u, q* |# q - }
: t7 i* k* S6 n* ]1 z+ }. s - + }& E8 F: K6 w3 V7 v
- bzero(buffer, sizeof(buffer));; m7 V4 E. t9 _# e2 Q. O5 T2 s
- }
: u9 Q4 L( P7 S5 U1 N( r - fclose(fp);. F: R/ C, D1 ~2 x, ^5 ~9 G
- printf("File:\t%s Transfer Finished!\n", file_name);
. W& _& y0 p- E7 ^' P8 z8 k - }& c* z5 f: p) U3 A8 y" T9 E
- r0 ~" N1 G- m$ b7 f- close(new_server_socket);9 a5 g! r* t0 l
- }
' O/ b0 a, k' Q' \4 L
/ t4 }& R1 \' Q: O- close(server_socket);0 }7 d" Y: U- D, n& C
- 1 E7 l, [* O" C( Z1 F" r1 g1 q% w
- return 0;
0 S7 Y5 G7 y; l% G6 J - }" t/ @0 Y. l1 N7 e
- 3 o" g7 t) j1 [" |0 ~6 p
复制代码 0 s5 i! D( C& ?0 [. U
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