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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.$ x7 \; L% Z5 P3 n0 [
- /*client.c*/
) j, F1 n3 @7 s - #include<netinet/in.h> // for sockaddr_in
" T; V+ z8 a( x2 v) U8 [1 L; A4 h4 f - #include<sys/types.h> // for socket - j2 ?, u8 C0 o/ n9 Q
- #include<sys/socket.h> // for socket 7 x& P: T2 C# o: ^, X
- #include<stdio.h> // for printf $ o: b+ I4 }$ T2 F$ l
- #include<stdlib.h> // for exit
0 W" n) ~/ \' z3 ^1 M2 T2 N - #include<string.h> // for bzero ! ^3 t" h+ V' R( `5 s
2 \( D# y& {8 k: v. t% K9 Q& \- #define HELLO_WORLD_SERVER_PORT 6666
2 t! S1 i$ ^1 x9 x - #define BUFFER_SIZE 1024 & {5 Q$ u, N: I
- #define FILE_NAME_MAX_SIZE 512
" s& X: X! d$ p- n2 X! x
; p/ E+ I6 | }" n% @' C6 m V- int main(int argc, char **argv) " C8 {" v# P. ^7 |! o3 o( Y! C+ S
- { . P1 {0 o" o& E! w. R! q% U
- if (argc != 2) 1 o' Y( E% V) G
- {
; z- A7 x$ W; O8 X) H1 c4 Y k - printf("Usage: ./%s ServerIPAddress\n", argv[0]);
) K5 _, u& e: g$ O9 ?5 \# p - exit(1); ; }- G& p; _" x
- } , a5 a" Z$ Y' V% g
- 6 Z/ g! w* f- f8 x; _4 I0 c: p7 `
- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
( z6 U1 z! R- C& C# ^ - struct sockaddr_in client_addr; 1 D) a4 V8 G1 B
- bzero(&client_addr, sizeof(client_addr));
; N7 o! `- ~7 Y5 z% g - client_addr.sin_family = AF_INET; // internet协议族
& g! @* P7 t- O+ i1 l& R. Q! u - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址 $ `( X9 E- Y/ t, G4 M) H6 r) ~0 b* j
- client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口 ' N/ E+ F7 c+ x6 U- P$ k
# ]9 S2 `6 w) I8 }+ ~% K- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
. A# v+ G5 u ~8 K - int client_socket = socket(AF_INET, SOCK_STREAM, 0);
6 F% ^8 m2 a- `% H- F1 p - if (client_socket < 0)
6 @9 m. Q5 b8 y* o }% i - { 3 Y( N: Q* \$ F3 \+ t
- printf("Create Socket Failed!\n"); - `3 \( F! j3 E# D8 g& t+ s
- exit(1);
. F2 }( r" U! L) s: n; ]/ v& E - } 8 m9 [: _0 k0 ^9 ~1 x, K m& ]: b
- * F9 v( E5 `+ B! d7 {5 p
- // 把客户端的socket和客户端的socket地址结构绑定 ' x5 j% q- j6 r6 `
- if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))
4 f) V; N) {# p2 x - { 8 C" l( q# y' [5 {
- printf("Client Bind Port Failed!\n"); 4 J2 ~! c& X0 u4 r' M/ T0 u1 C! l
- exit(1); 7 |% g) f; O: Z' l
- }
0 ]# D1 k8 h! D1 Y8 B
" g0 v1 V" n7 ^$ R8 b7 ~, g- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口
$ I- o/ F& _9 R4 g: U2 h7 k - struct sockaddr_in server_addr;
, E1 \) ?* }# V: B' C8 V X/ x; E - bzero(&server_addr, sizeof(server_addr)); 7 O( y1 h2 x2 o/ Q, i, L
- server_addr.sin_family = AF_INET; ( k) Q s8 h6 h4 c% ?! l. k
- 2 H; f) z' ~4 Y
- // 服务器的IP地址来自程序的参数 * Z- h1 y% h/ _( D o' h w
- if (inet_aton(argv[1], &server_addr.sin_addr) == 0)
% `# k# `0 n, i/ }- c" Z; P - {
8 ` s4 B$ r' q$ \ f - printf("Server IP Address Error!\n");
( }+ Y" ~9 O. b- n7 _4 r - exit(1);
5 g" b" F# ~3 B4 p& W1 B: T2 I - } ! M' v# F0 L. A
- + o6 Y& o! h/ J4 J) `5 I
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); - {* N* e5 V8 i/ a
- socklen_t server_addr_length = sizeof(server_addr);
H. u# D& a6 x( c: Y( }, @4 I; @ - # k. e& P2 m7 Q
- // 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 6 _( J" m+ A' U0 b# M# m
- if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0) / [. w& _- u8 h9 P
- {
4 ?0 Q! o9 Q( d$ M6 v - printf("Can Not Connect To %s!\n", argv[1]);
" B0 S. d8 w1 K% m. i5 A, @* [ - exit(1);
' N2 m; g- w2 d) {2 S# c- L - }
& M9 k9 w4 `6 s) G: {5 b
" ^4 @; L# T% H p$ X' M- char file_name[FILE_NAME_MAX_SIZE + 1]; 6 V. b8 j( U' \5 c# f
- bzero(file_name, sizeof(file_name));
0 s/ k: g* L5 Z' }/ x" z; } - printf("Please Input File Name On Server.\t");
) U0 _ f' f& m - scanf("%s", file_name); . L* a9 w' W! T9 f1 X$ K0 y
- X( d$ _* |: A
- char buffer[BUFFER_SIZE];
* [! }( u9 S0 U6 l$ T3 M% T - bzero(buffer, sizeof(buffer)); : R) X# E6 n, b- d6 [* f- C
- strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));
/ N J6 h% O E' 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 7 x" }7 @' ~/ ]2 w% h$ r
- send(client_socket, buffer, BUFFER_SIZE, 0);
& o; n4 s; o4 M& B0 j - ) a D8 j; u7 B: y* O7 Z
- FILE *fp = fopen(file_name, "w");
# P) Y: a Z: [ U, z' \ - if (fp == NULL) 2 J. B% V/ V1 \; ~0 ]- |
- {
1 e5 k; ?1 Z" Q" l - printf("File:\t%s Can Not Open To Write!\n", file_name);
) ~- Q) a! W* Z - exit(1);
, ?7 K5 l2 U9 ^0 s- G8 O - }
8 l) _: U$ G% m. H1 s - 7 V7 r* @3 N1 }! H; j
- // 从服务器端接收数据到buffer中 & ?/ Y* G! f* a. v2 l# Z: k
- bzero(buffer, sizeof(buffer)); * O k' O0 Q! S6 h- \1 B# ?
- int length = 0;
+ t: q: v) q8 I+ _3 F% Z - while(length = recv(client_socket, buffer, BUFFER_SIZE, 0)) " i: j$ k# M- k0 ]
- {
7 ?3 ^2 I2 d$ M% Y - if (length < 0) 0 @) M* c. `2 P6 P" m$ t% v
- { & O, o$ w) |8 S$ ^/ l
- printf("Recieve Data From Server %s Failed!\n", argv[1]);
% B* _2 `0 I5 G, L7 n9 V, V - break;
0 P6 j0 f, n5 D5 i% t+ M - }
! f; h! t/ H/ f; |6 ]; I - 0 d9 i- i9 B. z' P
- int write_length = fwrite(buffer, sizeof(char), length, fp); 1 z( B/ v/ I7 ^7 ?
- if (write_length < length) . p8 d) Y9 T& r3 @
- { 0 a% E, L5 S% K1 n* o+ j
- printf("File:\t%s Write Failed!\n", file_name);
6 `) ?" m$ n, g: V$ F - break; ) B; d5 R& I( K; \1 e4 c
- }
" [* f$ L' b. r - bzero(buffer, BUFFER_SIZE); 1 d7 _% K7 A1 d# R
- } 3 ^& a# I* r& M4 d! [0 N$ U
- & F5 O5 T: U) y' K
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]); 6 G! T- O! N% ^; Z/ L
" x: [$ n/ J, H( P7 ~- // 传输完毕,关闭socket ( W4 X. j( T/ a; }) j, R: |, h" N* u) @
- fclose(fp); ( [/ ^1 r$ Z; ^- i4 {; I
- close(client_socket); 5 p% p! |/ l2 [& b+ H& i6 h+ c5 f
- return 0;
$ D. Q$ B: g! c' I7 G) }- Q - . N$ y _; w4 v- _' b- g6 k0 {% |
- } 7 ^, `/ l3 Q; f$ }/ K8 \- `
/ R; h4 W9 C9 k3 @
复制代码- /*server.c*/
- ?0 o% v% f( v6 P" x - #include<netinet/in.h>2 A) M2 m# z/ D' \8 X7 O% Z+ \: F
- #include<sys/types.h>
- b3 O" P4 q b' D( l# v - #include<sys/socket.h>
! ^7 b9 q3 z1 \ a" g' E - #include<stdio.h>
7 x; [7 S3 D" f5 F) s( @& |1 m - #include<stdlib.h>
) e4 t; X4 D( a - #include<string.h>/ N% s+ b2 }. I2 P {1 w! Q% v
- 8 A3 i0 R1 k$ j1 m& F
- #define HELLO_WORLD_SERVER_PORT 6666 //端口号
! z; m. q: k7 b# _7 O - #define LENGTH_OF_LISTEN_QUEUE 205 u0 G% ^, Z, s. G$ C6 U7 V, P
- #define BUFFER_SIZE 1024
: G5 E2 V2 b$ ~: n- s! i - #define FILE_NAME_MAX_SIZE 512- n- _4 Z' a4 A1 `+ p! y
- 8 ?) h* \: B0 W$ b; t
- int main(int argc, char **argv)# l' t' T& n$ Z; ~: _3 u6 w9 h
- {
- Q/ V5 O; s; L1 o8 v! x1 J1 l - // set socket's address information" A, g- a, a/ c* Q9 m1 o
- // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口' t3 m( b) ^4 W. }7 J; F, o" W
- struct sockaddr_in server_addr;
- Z8 u8 a) u9 T U Y2 i - bzero(&server_addr, sizeof(server_addr));
9 h6 c4 L' z) u0 }- s7 ~ - server_addr.sin_family = AF_INET;4 @' y. Y/ \5 N8 k8 r6 E/ d- n
- server_addr.sin_addr.s_addr = htons(INADDR_ANY);
& o" d. y7 z8 n - server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);# x n' |; d& w. B( D
: Y2 n! g4 H! t- // create a stream socket
+ r, p7 O* K, J" ]( w - // 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1 S) d/ d* Z7 D* `9 W1 H
- int server_socket = socket(PF_INET, SOCK_STREAM, 0);
) p' ~+ w! j$ v; @. Z - if (server_socket < 0)! R; _+ c1 u% R- A6 k# b
- {
' x/ l( y2 K5 n2 m0 l- { - printf("Create Socket Failed!\n");
2 A9 u+ J/ U3 r6 s' F1 P - exit(1);
' D- s& E; @/ i. j' O8 q4 N# } - }
+ O0 ]2 P( \5 v4 b! S3 h, r; q, V& F s - . I& { e4 J) G; b- ?
- // 把socket和socket地址结构绑定. @: l# D: m* N! V% l5 W4 Q
- if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
8 L3 y2 i# Q8 |6 ^ - {
, s, D \) I2 l# j$ } - printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);5 F) i! W. Y! S# u; Y
- exit(1);
" U4 s9 y2 e$ y4 c* K4 i - }
- y+ B9 z8 N9 x! D/ [
) _: L$ l4 i0 \) U0 m- // server_socket用于监听
. R6 _0 t! Q' F+ x$ l; h - if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
; y9 C/ S8 @7 d$ D9 ? - {
9 y9 Q1 x# Z5 ^ - printf("Server Listen Failed!\n");( x+ |: U: g8 X2 K/ Y
- exit(1);
, j3 B* E# A# \ O - }
% V+ n% c- U; x n - ) B+ N2 s7 W, Q$ S
- // 服务器端一直运行用以持续为客户端提供服务: J, g# i1 @0 D7 d7 x6 [: [
- while(1)
{* ^' s* O, P- z, S4 R5 R - {+ m7 `& R8 m) ~% |$ ?1 f, Z! p
- // 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- o3 G6 }- h/ p
- // 接受此请求,同时将client端的地址和端口等信息写入client_addr中
9 A! i$ G* M& J, m" U+ j' ^5 R - struct sockaddr_in client_addr;2 {, ^$ d- l3 S, t
- socklen_t length = sizeof(client_addr);
# u; O8 U# f: P) b# t' c$ }# |* l - * G& s. H0 ]# Z8 h0 [
- // 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
. ^0 \" c& `0 [1 J% a3 [! a- }7 W - // 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 c8 U: ]6 ]$ V+ R g
- // 用select()来实现超时检测6 C: `, U- \" X
- // 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: Q( E+ q0 T" H, o& l: q0 A
- // 这里的new_server_socket代表了这个通信通道2 \" u0 a& c W
- int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);
# ~0 ?' X( O5 r ?9 @0 C0 D - if (new_server_socket < 0)) D2 l: Y8 c- p( i) t/ W7 Q
- { R6 a$ `% E. O' X
- printf("Server Accept Failed!\n");
7 g! X* F' R5 [ - break;6 [) Z$ f4 C. v, Q9 u% B* R
- }3 x( @* y5 n& Y4 Z" c. G
8 c% {! U) C* R) X$ s' g$ g" w% ^- char buffer[BUFFER_SIZE];
, b. a6 e7 s/ ?1 x- S - bzero(buffer, sizeof(buffer));
% T% o- y- i5 o( r% q - length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);
0 P, H9 ?2 K7 }+ ~5 j# ?) k* _ - if (length < 0)) h) r7 Y. G I! n1 O# a
- {
5 e% _( R' M: X" }% Z - printf("Server Recieve Data Failed!\n");
$ y6 f+ S0 m$ b: r& B - break;0 B6 E4 k1 X: W2 i; D, t" p
- }
, n7 A2 z, F0 @9 [$ n3 W/ I
. X9 E+ }2 ~" y) J- char file_name[FILE_NAME_MAX_SIZE + 1];- P& o7 F- S& H# A2 D
- bzero(file_name, sizeof(file_name));' q! R; y* W! q5 W" \7 p
- strncpy(file_name, buffer,
' e1 g# g/ v7 n! b: N1 c - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));" @$ P; B. V7 L" i8 T. d
- - E/ L5 \- w7 f X* ?# I
- FILE *fp = fopen(file_name, "r");$ q) h$ ]5 U8 p0 {
- if (fp == NULL)9 |+ b& N1 ^5 @ e1 i5 L8 o
- {
9 `( o+ H) ]& `' Q. j- o - printf("File:\t%s Not Found!\n", file_name);. A, m! C; L) ?5 H1 Z* E3 `; U1 e
- }
9 e! s, u5 t6 o/ G - else+ f; Q4 V( ^' f0 r) w- T
- {$ n1 a1 Y! n4 y4 O% f3 E- d* E9 m
- bzero(buffer, BUFFER_SIZE);' L0 h4 b, A7 [ v- q% e
- int file_block_length = 0;
. T- B' d. e8 m0 M - while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
+ X; Z0 J6 Y7 M N, r" s7 h - {7 g+ s7 B- L0 m. p9 q e
- printf("file_block_length = %d\n", file_block_length);4 z$ R2 l- g3 r/ ]
% @8 U2 ^/ X* r: c0 w- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
# a& R- [; J4 F1 ~( o - if (send(new_server_socket, buffer, file_block_length, 0) < 0)
! |6 q1 V! a' e, k4 y - {% O3 ]4 W) o. u4 J* C
- printf("Send File:\t%s Failed!\n", file_name);
2 e5 Q% n7 E6 A$ L/ @& C3 a - break;
4 L5 [) Q" t2 y4 m, w - }/ |7 _$ b2 Q9 `5 ~
% r( ?. y7 M3 F' f( m- bzero(buffer, sizeof(buffer));" K0 o* j4 L6 U l8 @
- }2 W6 ~' C+ I1 S9 V2 l5 `( H+ N
- fclose(fp);8 h. H, o3 B3 {3 V# B1 q @+ |
- printf("File:\t%s Transfer Finished!\n", file_name);
- N% ~0 N5 ]* V+ I# S9 R - }
" @1 w }6 ^* c$ h - i5 Q+ f* Z' N
- close(new_server_socket);, l9 i$ O! u8 a& J; Q
- }
/ u1 R& B5 o+ \# q
- m! k% Y: u/ I8 }, j! D+ d- close(server_socket);" [4 N# y" x4 Q8 t3 t( E$ l
- ! b: |5 e" I' j1 T, h
- return 0;
, w4 P) T( p. \) d* G1 I; H( @ - }/ v& i N: e! S
- ) r1 |7 j" ?/ Q( @9 Y5 z- E+ z
复制代码
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