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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.% M! H/ G% N# ]8 T/ q
- /*client.c*/
# g) ?/ A: g- {( w4 Y% m' } - #include<netinet/in.h> // for sockaddr_in
1 [" W/ q2 M R2 L8 Q' p - #include<sys/types.h> // for socket / B' {2 G( h6 ?" R4 B
- #include<sys/socket.h> // for socket 8 z5 i3 `) S& x
- #include<stdio.h> // for printf 8 f4 m7 i/ p2 H
- #include<stdlib.h> // for exit
) x$ W& T; M/ { - #include<string.h> // for bzero 2 |( y* l% w5 S9 \$ n) D/ C4 K" Y ]
7 p) i+ d# H) X3 ~- #define HELLO_WORLD_SERVER_PORT 6666
3 l! E& H1 @( V' ? - #define BUFFER_SIZE 1024
: `5 F$ i' k) ]2 l - #define FILE_NAME_MAX_SIZE 512 / |7 m% v w& E I% ?- i
- 3 f4 M5 i2 ?) [7 s$ x7 e. U3 {0 _
- int main(int argc, char **argv)
/ a- K& O# X6 y7 _2 k6 z" I - {
. ~4 v0 d" O6 z - if (argc != 2) ) f0 i8 |3 V, u' y0 J6 j; [7 I
- { ) o) ~: v, U& l8 s8 G8 k0 i
- printf("Usage: ./%s ServerIPAddress\n", argv[0]);
1 ]+ W2 y/ ^" H7 K* E6 F - exit(1); ( \4 |/ F4 Q9 Z' ?4 p
- }
0 A1 e2 X; T. U8 ~0 L+ e
6 @3 y: j" k9 v2 @! v- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
2 D* r7 U" Y+ l+ h' p% t* I: D& F - struct sockaddr_in client_addr; , E8 [& j2 u, J, d/ P' D( w
- bzero(&client_addr, sizeof(client_addr)); 9 Q( j2 m8 E8 c) U
- client_addr.sin_family = AF_INET; // internet协议族
7 @8 ~* y7 @3 A9 [$ P7 S: W; { - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址
9 o/ e6 r% w; V: h' x p - client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口 ( ?' P% x5 F6 Q! ?# [" D1 V
1 {; u% X' m" O9 ^- k! m8 I- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
$ M( M) c' S; ]1 K0 i: n$ H - int client_socket = socket(AF_INET, SOCK_STREAM, 0);
" _5 ?2 Y+ U$ h - if (client_socket < 0)
' U" K/ }( g7 N) D) T3 ]) i7 K' S - { " P* Q5 i, ~( h* G; L
- printf("Create Socket Failed!\n"); / \8 o; q: p/ t8 N
- exit(1);
; u3 c. A4 V: u3 f s+ a% j, J - } # C z9 C5 M+ C" `8 R
- 6 h* N0 k* ?$ _( ]7 Z# t
- // 把客户端的socket和客户端的socket地址结构绑定 4 ^1 j3 l+ _8 d: n
- if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr))) ! m, v* m0 s# n( U$ ~8 C
- {
1 O# V/ Z9 R; b% q6 E/ _' O( q - printf("Client Bind Port Failed!\n");
+ l: d' O, \7 b3 E# M) U - exit(1);
8 o/ B0 p% K8 i/ }& |3 m$ v6 b$ } - } * B' k; m3 w. X: b, w- z
3 g( d |; P7 y4 j- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口 2 j% k9 s/ D; D+ R- m; l7 q
- struct sockaddr_in server_addr; 1 y6 Z9 z; X8 ~/ T9 N
- bzero(&server_addr, sizeof(server_addr));
! r7 I( [2 v4 S) L! c6 Z - server_addr.sin_family = AF_INET; 2 T' ~2 P0 G) x
9 `2 `* c) k/ }! R( s Q% _' F- // 服务器的IP地址来自程序的参数
, P0 ]9 l7 W! T/ o" @* g - if (inet_aton(argv[1], &server_addr.sin_addr) == 0)
/ c9 L! L& [ ^% {2 f: w - { ' g, X6 l. s2 s3 u& K
- printf("Server IP Address Error!\n"); - ]0 P- g9 N! n7 Y# @3 k0 g
- exit(1); $ s+ O1 `9 x* ]* w) M8 ]" ~* c
- }
& }2 x7 s) {. h3 ]+ J/ l0 i - : U3 F8 S( k6 ], r( s! ^* l: Y
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); ' P+ _8 w% {8 W9 _
- socklen_t server_addr_length = sizeof(server_addr);
% I+ u! A7 }6 J! e/ k" r8 O$ I7 ^ - 6 i% i2 S, g( S! I6 W6 l9 w
- // 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
& d7 Q) ]$ ?& j5 R# g; ? - if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
) U6 j; [6 e, N7 k" k - {
% K- q x: f& J' e, W7 @ Y: `+ c - printf("Can Not Connect To %s!\n", argv[1]);
6 P. A E: s4 T7 Q) E$ e - exit(1); 9 {+ j* w2 n/ s5 d' q4 u
- } 9 p" v6 x1 v% k% [8 J8 c! n
( c2 ~* `9 L: K- char file_name[FILE_NAME_MAX_SIZE + 1];
5 N: v( k+ ~% t! z! ? - bzero(file_name, sizeof(file_name)); ( n0 {' t9 U! T+ c8 }, G9 T
- printf("Please Input File Name On Server.\t"); 2 _( S3 t) q0 o6 v. c9 _
- scanf("%s", file_name); ' U; Z5 r ~, g! ]
6 e) T& V6 ]( p! }- char buffer[BUFFER_SIZE]; " h7 k1 ~, m4 z' g& ?, j5 O
- bzero(buffer, sizeof(buffer)); 1 z" S% A ~* G, j% o) B5 n6 C
- strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name)); 0 Z3 j7 Q) g) |' O u. ?. H/ t, z
- // 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
( H, A- X; }' { x - send(client_socket, buffer, BUFFER_SIZE, 0); 9 V& W" l+ l l! o+ E* r
- $ ^ Q: Z7 ^4 l8 s0 o# h
- FILE *fp = fopen(file_name, "w"); : T2 N5 m( j4 I. Q( o8 w# k7 X% q
- if (fp == NULL)
" q6 U, K. D) X6 N - { $ f+ L5 y Q. a
- printf("File:\t%s Can Not Open To Write!\n", file_name); : Q0 D" c! t% }4 s
- exit(1); 1 L* K9 K% ]+ d4 d4 s3 n
- }
1 L8 s& D5 m* j - 8 z2 ]% |8 ^+ d& G& i3 L4 j6 W+ |
- // 从服务器端接收数据到buffer中
$ h& W8 I9 U4 F - bzero(buffer, sizeof(buffer));
" O# s( T7 Z+ h - int length = 0;
: ^6 m: ^# P& N. Q5 g - while(length = recv(client_socket, buffer, BUFFER_SIZE, 0)) & `' |& j2 R/ X! O) Z, M: [4 e
- { ! \* x4 t* R7 I, X
- if (length < 0) 5 a7 {" i) c7 f: N
- { 9 ~! O% E% a/ u- e& `- Q
- printf("Recieve Data From Server %s Failed!\n", argv[1]);
0 ]7 B+ H4 d+ g2 i6 Q/ E9 c - break; * z4 I& a# X; X6 @. h
- }
6 g3 f9 I8 }! S2 d, k6 l - ( X, f4 K! @' r7 n$ s4 h" l2 k) O$ H
- int write_length = fwrite(buffer, sizeof(char), length, fp);
2 p# J) C0 l1 G0 B! O: I - if (write_length < length)
: t* ]$ Y( z. E( I2 ]# Z - { D5 _. W* D4 p
- printf("File:\t%s Write Failed!\n", file_name); : _4 x3 }" b$ T3 c
- break; " d6 o; a/ m" k' o/ S/ H
- }
- J0 p m' i& o3 u( S+ D% B - bzero(buffer, BUFFER_SIZE);
6 L/ t W! N; C0 n' b - } % a% ?% X" S8 p, V* S
- @; U( a0 k$ U& u9 V; b6 N- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]); 2 N0 q, O- Q5 u8 A% x/ ~) G
' [. e' n+ k. F7 A- // 传输完毕,关闭socket
8 m0 T: i- ]5 Q/ _3 O, {3 c; b - fclose(fp);
) Y) q( j! b0 R/ L - close(client_socket); ) w- @1 f& P% n, i9 m
- return 0; ' ]1 V2 l( I. S% K X
- % z8 M6 Z! I/ @/ d# @. A
- }
* h9 U! D0 y9 y4 @ - 3 j7 w& F& |5 t3 S6 V7 ^
复制代码- /*server.c*/
) k' j' q! h- ?0 e - #include<netinet/in.h># [$ o9 p; S1 T2 {) O
- #include<sys/types.h>
, s9 g9 @8 l3 }0 Y$ H6 G. P - #include<sys/socket.h>: r1 L( D+ L! n
- #include<stdio.h>
* j4 H( Z( o& B7 ] w0 Z - #include<stdlib.h>0 l: }0 {" a4 E) X
- #include<string.h>
% _( n* ?3 j$ f
: z1 I) @7 X. t- #define HELLO_WORLD_SERVER_PORT 6666 //端口号
3 c* X- k; s8 a4 U - #define LENGTH_OF_LISTEN_QUEUE 20
# S! K5 e* B' W2 r" i# {+ H |, s - #define BUFFER_SIZE 1024
5 ]: E7 F: r0 W - #define FILE_NAME_MAX_SIZE 512
: g! V! j$ e6 }1 o5 Y - . K. ^( u5 G, f
- int main(int argc, char **argv)
& L: b" s" Z4 l$ V5 y$ e( \1 F - {
R3 R; _/ g: Q - // set socket's address information
! `. r' _5 ]$ {/ {; N' K- ]- \ - // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
! H( n; o0 q/ _. T" ^( w, [* M - struct sockaddr_in server_addr;
+ w3 J+ Y$ a& f. I* Z - bzero(&server_addr, sizeof(server_addr));! c( N7 X ?6 |9 H+ o
- server_addr.sin_family = AF_INET;
d( I. G/ ?7 C; [' }) g, ?# w# } - server_addr.sin_addr.s_addr = htons(INADDR_ANY);" p2 Q2 M7 G. U/ G; W0 b
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);" k- D/ N$ ~/ ?" n1 d! ^. k
- ( S! l; n; G4 V6 [6 o ?. j
- // create a stream socket) ~# Z! Z# \0 t, U- C
- // 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
9 G3 \( N3 H6 d9 P/ e - int server_socket = socket(PF_INET, SOCK_STREAM, 0);
8 N M- d! H6 d+ q% w. x - if (server_socket < 0)
) b7 \1 P" ~( e! J3 t5 o& s! Y - {
- f- l/ i& O. _ - printf("Create Socket Failed!\n");! U! p4 Y- j) q1 p- Y1 I' h- L
- exit(1);
& [; p0 o/ ^1 a }* H9 g$ ? - }
1 A9 G9 F/ B# v: O - 8 y. R2 ?( p! m1 Q4 s) o2 i
- // 把socket和socket地址结构绑定" z) P/ y6 y! M6 x# M+ ?
- if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))! }- h4 q! F# r4 @: w, ~
- {3 d& h5 X2 u$ D( [/ B2 f; Z) o1 D% C
- printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);
P( L! [' ?& v& A K* ? - exit(1);; y% O! u3 d% A( Q+ z
- }2 v; ~6 J T2 q7 q1 ]
- 0 y6 r, Q+ i. y7 |
- // server_socket用于监听* R7 O+ K5 C" g# u& d9 a
- if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
; A5 T. r( r* k2 z6 T# l' [ - {
: q: c+ Q! F. |0 k* w, c1 } - printf("Server Listen Failed!\n");, s- Y1 g$ b& n0 G+ r6 t
- exit(1);. E8 x6 G& ]8 c4 F9 }
- }. N7 F' X; G) Q1 ~3 R
, y$ _; _' G9 n, G4 ~+ t- // 服务器端一直运行用以持续为客户端提供服务) a9 ~# H* a+ Y$ V! D0 S+ [! I, e
- while(1)" ?& O( u) c6 P% y4 R9 u" }
- {
) k \& Z# D, j9 T2 d! r/ F4 N d - // 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
! e1 A T1 s( K* d( |/ k - // 接受此请求,同时将client端的地址和端口等信息写入client_addr中. H7 |$ M1 E. k- `3 I' f
- struct sockaddr_in client_addr;- U( U* J0 U+ {' N. h/ P
- socklen_t length = sizeof(client_addr); O& m3 x! e8 ?
- 3 A0 X: A o* ~6 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
1 x- m& \& X) M; J8 h8 R, @4 r - // 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" X3 X( N9 ?8 P9 Y
- // 用select()来实现超时检测$ [6 ~% H f0 `0 h
- // 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
! v. n7 q" `3 j W8 S# g9 `% X& k - // 这里的new_server_socket代表了这个通信通道6 T8 Q' J2 `$ i7 l. R# u/ c, V
- int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);
9 P8 C6 ]& _ c" z& F4 Z8 ?: J z - if (new_server_socket < 0)) e2 ?9 K0 B/ N7 J: X5 v/ B
- {4 L& f& b A, u& y
- printf("Server Accept Failed!\n");
3 M6 Y9 E' C- ^, p: ] - break;8 w- {1 {2 a7 X) `
- }
; O8 L0 a3 l* \# ~ - 2 Z, c2 M5 E& y7 |/ ?# e8 E. r
- char buffer[BUFFER_SIZE];8 y3 H! b8 g8 m: q( ]
- bzero(buffer, sizeof(buffer));
3 D( T% ]) T, R- w$ W6 W - length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);6 i/ G4 S$ x2 d" x) z: P
- if (length < 0)% o7 @! o8 v1 o8 W6 W9 Y
- {% C6 R. p- P8 V) U& b+ g
- printf("Server Recieve Data Failed!\n");
. q: j& r% s) c/ x - break;
+ v) x. W8 p( d$ ?* b4 L9 f - }
* x z- M6 i/ D8 X0 P h- s9 a - 8 f6 N' ?) o3 f
- char file_name[FILE_NAME_MAX_SIZE + 1];4 x, c& `6 H& K3 {- O% Q
- bzero(file_name, sizeof(file_name));2 C4 X+ Q0 @2 `! Q; N, L
- strncpy(file_name, buffer,
; ?1 P$ e0 G! A - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));( ~7 ~% N) g9 C! \7 T+ z3 \ A
- 2 Q" x# x! U+ ]9 G! z; @5 H
- FILE *fp = fopen(file_name, "r");
# y7 B( M4 `% P% \$ D+ s - if (fp == NULL)
' W; U, Q6 j1 _- r* C2 U" B - {5 Z3 Q1 s/ X7 }- I* O
- printf("File:\t%s Not Found!\n", file_name);
. m F7 I' o1 t& |$ ] - }% V4 A+ {2 E! r$ X" {: z
- else. f$ ^/ A, e" d/ d% ~
- {1 n% n; L" r1 m* L/ I
- bzero(buffer, BUFFER_SIZE);
) N" w1 ?% M! i; _ z) ], | - int file_block_length = 0;
' m( e: X5 c+ y% _$ o) A8 I - while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)! T5 ?! R2 ~4 r: R# w# G6 d
- {
& T1 v: i# j- h+ m+ h' N6 E - printf("file_block_length = %d\n", file_block_length);
% U1 s, x$ \2 {! e4 C) U% ]9 u - ) J- D! g# u0 M# N4 P
- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端( m6 e2 |, A N1 j7 Q
- if (send(new_server_socket, buffer, file_block_length, 0) < 0)0 O+ A" T/ z' {* m1 f0 R
- {
% l/ ?9 l9 L# E4 Z$ {# q - printf("Send File:\t%s Failed!\n", file_name);5 v- F7 o. Z. u/ k9 {6 X
- break;
/ J5 b1 t8 a- o3 D6 \8 _ - }
; L: J; b1 ^+ U* ^; R: X/ j, R - 8 P9 t5 _5 k4 C1 }( Y3 R
- bzero(buffer, sizeof(buffer));& A( ]. @6 R* J$ g/ P
- }
8 j6 m; V* C! m7 F - fclose(fp);
: @4 _" ~ ^8 ^/ l! `$ ^0 K - printf("File:\t%s Transfer Finished!\n", file_name);
~5 L, h2 C/ F3 ] - }3 m5 T* |" n5 U: F5 L# m! J
9 H! Y+ O" n/ w. f( ]7 z- F- close(new_server_socket);# G. [. B" w7 `
- }5 y9 d, A$ i6 M p
- 2 h$ v* Q4 p! e! z
- close(server_socket);0 D; T6 b9 @( y, \) ~
0 J V' X' a6 r- return 0;
, W5 n3 @# t$ o- a3 |4 N - }
4 w( Z# H" {% f9 u - 1 E1 O! x2 Z# t0 R* u% `
复制代码
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