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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.* P" f0 D. C. k( Z; X
- /*client.c*/
& z/ S0 \& Y) q; W/ N3 g% @6 b7 [1 A3 d - #include<netinet/in.h> // for sockaddr_in , a8 F; r$ |% D! p
- #include<sys/types.h> // for socket ' P7 o* M. j4 z, {5 |2 z( Y
- #include<sys/socket.h> // for socket
. _0 t! p. j! ?) Q; E# V+ u - #include<stdio.h> // for printf 2 ^6 e8 b" S+ d
- #include<stdlib.h> // for exit
4 y2 [3 B. l9 l. v. D! @ - #include<string.h> // for bzero : l% x. x# ^5 _( f: D' R! W, D$ j, v
- 5 m, z# H. P8 O! ]: |
- #define HELLO_WORLD_SERVER_PORT 6666 9 V0 A+ y; k, u. U" U4 ~3 U
- #define BUFFER_SIZE 1024
* g# \! ] T) p. ^' Q - #define FILE_NAME_MAX_SIZE 512
* m% ]4 D: `, A/ S
) B1 S. c" o$ L' A& U" s( z- int main(int argc, char **argv)
% m# E" [/ g; [: [- j - {
5 R2 M2 `9 [8 r5 J8 A - if (argc != 2)
3 k+ M2 G" e. E' X# m& W - { # O9 a1 I8 J# e" R) O
- printf("Usage: ./%s ServerIPAddress\n", argv[0]); * w, g: Q) ]5 V3 n4 ?5 s) z
- exit(1);
3 s, y- i4 w: `! R% W- G6 N - } ! ?: i6 J, H @0 h& v9 l' Q
% q6 B2 s3 J& g K% ?- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
* Z/ V2 l! m, ?3 i/ _% k# O - struct sockaddr_in client_addr;
, B4 E. h/ z/ I9 `4 a; Z - bzero(&client_addr, sizeof(client_addr)); 7 G+ [7 i* I' {8 _+ T, f
- client_addr.sin_family = AF_INET; // internet协议族 4 o* v5 e% T+ x7 m$ C; U$ a5 Q$ i
- client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址
1 w5 ^8 b4 g4 G- L* k2 o6 h: x - client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口
0 X7 [; g [4 B3 T
" p, j9 Y4 h& U* L2 i- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
0 z# q$ j* L' n3 ] - int client_socket = socket(AF_INET, SOCK_STREAM, 0);
! K7 ?. ^6 h, H# T) I& x. U - if (client_socket < 0)
! T' c) \; g. r2 |( |0 t; o - {
4 o4 ~6 j/ ^' t- k1 U9 Z- [- O/ q- v - printf("Create Socket Failed!\n"); : B9 k: L( x. y* `( I& J/ f7 _ N
- exit(1); # S7 G! P. L$ \0 w% H
- } ' h K; I8 `& {/ R" z9 e+ ~% g$ Q
3 p' Z. H! X7 n$ L- V8 A2 O# ^- // 把客户端的socket和客户端的socket地址结构绑定
0 ~% T A3 N' Y' Z; I" s4 H# m! a* s - if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))
( N4 O) l: ~. j: F) @4 y# r - {
0 @3 q0 h! o0 [5 p5 w& v - printf("Client Bind Port Failed!\n"); 2 L" h7 r1 ^# m' N7 W7 v
- exit(1); 3 L$ f d' U' L( I8 E1 H
- }
% W7 G% K( T; W, d2 C
! \1 x0 q" p" X4 ^% `2 R8 _% v- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口
( O$ U7 |( A1 h( W9 ^$ H - struct sockaddr_in server_addr; 4 y# T: E: n& q' s& W- g
- bzero(&server_addr, sizeof(server_addr));
+ |9 ~2 }8 Z& @+ B; U0 B& ^. Z - server_addr.sin_family = AF_INET; 5 q8 ]" C$ {2 `+ b8 i
0 t( G5 L) h+ Y- // 服务器的IP地址来自程序的参数 9 C" `4 x; T) X* U; k( q
- if (inet_aton(argv[1], &server_addr.sin_addr) == 0)
2 t( m* l& \% F+ E - {
7 l: f& c8 i- {; x( d0 r: R- O - printf("Server IP Address Error!\n"); 1 u8 [2 d( d( A) L( J! r3 i6 K; e
- exit(1);
& B4 b% z9 ]- z% U; J& Z7 o - } ( ]* P) j; H/ b5 U2 k1 y: p8 D
- * |9 p1 u( K2 e1 p! l4 F+ F
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
+ @ Y6 s8 [& R P o* o4 N2 L8 u - socklen_t server_addr_length = sizeof(server_addr); 1 E. {9 E E [: Z
- ! _0 N+ r& t7 z+ P6 O9 `
- // 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 9 c/ Q7 v" D) b+ v/ [1 C U7 J
- if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
/ i: S- {: b+ @ - { # N# y" s! W. b w$ R
- printf("Can Not Connect To %s!\n", argv[1]);
" o2 _+ T9 A1 T3 Y9 o - exit(1); : v2 b% J, h* Z/ O
- }
# O5 r: a2 z: t
1 v% J" R; N9 K1 ], y$ K- char file_name[FILE_NAME_MAX_SIZE + 1]; 8 @) n$ ^9 |% W6 J' ?5 [7 c1 T
- bzero(file_name, sizeof(file_name));
7 y, J1 u6 J7 T$ c0 z - printf("Please Input File Name On Server.\t");
6 y1 `7 L3 n' F4 C+ J. W% P - scanf("%s", file_name);
) c5 h/ }" o( a6 g4 U2 g" b - $ r5 [% y; x7 w
- char buffer[BUFFER_SIZE]; 3 |3 Q* a+ j; w3 {/ M* ~' g
- bzero(buffer, sizeof(buffer));
0 k0 n' Q% R) j - strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));
6 D1 R3 ~* w" 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 , s, w( I0 B# [7 w7 P X6 ^$ _
- send(client_socket, buffer, BUFFER_SIZE, 0);
: G4 s: ]# c& Z" \ I
' r8 M& \2 r# g3 K% T! ^7 K- FILE *fp = fopen(file_name, "w"); 2 b/ G& A5 N5 m
- if (fp == NULL)
3 c" g6 s' M- ^ a' |' Q - { & j7 ?. \& b0 T* b$ y5 y; E: ^5 n
- printf("File:\t%s Can Not Open To Write!\n", file_name); . ^# z. `9 | i3 b o5 N/ @7 l7 _
- exit(1); 7 x& \; b$ s6 T
- } , C2 e, S2 d* w3 N
1 c6 g4 l: J' ^; _8 ^% [3 x- // 从服务器端接收数据到buffer中
/ Z$ U }6 E) }. q - bzero(buffer, sizeof(buffer));
: l' k8 K: N: ~* j o! V/ b7 i - int length = 0;
9 ~# ~. Y7 A; C+ d0 M - while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))
) j# p* Y1 f" N: G7 v" ? - { ; }, N& c( P% w
- if (length < 0) % g& I6 P' ]5 ~ J! _/ ~. c5 q0 |
- { 4 o' @& u! c$ M; q' w+ |, L: W
- printf("Recieve Data From Server %s Failed!\n", argv[1]);
2 [& _' o' E# A$ D4 _) w: Z# ~ - break; 3 o3 ]6 F4 ]& W. \% \ H
- } 5 N& W+ Y2 R+ \
5 G* ^* Y3 q0 d% A3 U1 A( F- int write_length = fwrite(buffer, sizeof(char), length, fp);
. k( D/ A9 Q. k - if (write_length < length) : D4 U& ?9 {9 z8 t
- {
$ C1 m! z9 H# u% W, y5 ^ - printf("File:\t%s Write Failed!\n", file_name); ! c* ^" f0 Q" A' z& _
- break;
: m( K. \6 k' q$ R! j - }
" J; m& h2 p: m2 {+ f( s - bzero(buffer, BUFFER_SIZE);
/ H' E) ?9 I0 F& [# e- `( }* O' S - }
1 r" y3 a) d9 t1 }- p$ {
T; }6 k9 m2 k+ O2 b( b- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]);
8 V$ `- z9 Z7 s0 i' l - 4 @: w8 o5 ^5 `6 m2 u
- // 传输完毕,关闭socket : ?5 H/ M, _7 m
- fclose(fp); , v& r1 r6 n2 X/ I% t8 N$ x* W
- close(client_socket);
1 K4 V& L5 x0 R2 W) a* J - return 0;
0 [7 x+ v8 t. u) w9 c% n
4 F* X3 }: F0 J- } ; W! B6 f$ i! `2 j2 F0 ]% ^
- # c0 u: }" j3 g6 v9 M S( K' H
复制代码- /*server.c*/
1 s) H* [( d$ r% A - #include<netinet/in.h>- k7 a& h# ]) n. \6 w; z
- #include<sys/types.h>9 \4 V2 @/ ]1 }2 b1 H& e
- #include<sys/socket.h>( j7 ?& N& _, Z5 }+ S$ b6 L6 P$ E
- #include<stdio.h>4 H+ z' r/ `/ ` G4 J3 a
- #include<stdlib.h>
" _2 p, r j4 O0 S9 ] - #include<string.h>
8 ?2 m9 u/ E6 d i& Z3 e - / A, f9 i; U0 S) ~' v. f8 o8 s
- #define HELLO_WORLD_SERVER_PORT 6666 //端口号
# C6 W/ l ~- m8 x0 j5 E! u @ - #define LENGTH_OF_LISTEN_QUEUE 202 s* ~' ^, p0 }/ P7 `
- #define BUFFER_SIZE 10244 t( n) m% }# d* k
- #define FILE_NAME_MAX_SIZE 512
* l ?4 N( i8 `7 c - " m7 i3 u+ Q3 Q! v2 Y* ~. H
- int main(int argc, char **argv)1 d7 U) R! i; ]0 M
- {# x7 `" l' T1 D. I4 G2 t3 U; L
- // set socket's address information2 ?5 O/ y# k0 w$ g; i( [& J
- // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口5 w: }. K1 l0 i. A8 J: r* y
- struct sockaddr_in server_addr;
& u: r2 C. P* |6 |0 j. o - bzero(&server_addr, sizeof(server_addr));' O- e! f# c: x5 R3 s
- server_addr.sin_family = AF_INET;8 _- i+ U/ t+ d- O7 v, f( ^
- server_addr.sin_addr.s_addr = htons(INADDR_ANY);
3 |0 t% s8 {0 { - server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
5 r! b) L/ L' ^7 @( R - % P9 V3 p6 X9 w8 y, N
- // create a stream socket4 }& i& ^$ y% ^) Z) W7 R
- // 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
% X" ]6 m, Y' ^; b2 s3 g; z! D3 { - int server_socket = socket(PF_INET, SOCK_STREAM, 0);) s% F6 A. R) s8 H# c$ w
- if (server_socket < 0)! H y- ^$ r0 n% ?. k" {% [
- {
1 J# d9 c( F1 r2 G - printf("Create Socket Failed!\n");
+ u1 t* i7 [6 B( x/ t$ c0 ^5 p8 x - exit(1);
! s9 q- k S4 U. ?* f; S% n" Z - }
; E3 `9 U4 N& ^& p* k- v
/ x+ d* ^3 [, f8 |' h2 D4 ?- // 把socket和socket地址结构绑定
/ B0 F9 G4 _0 h( e/ W; G - if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))9 ]! }! D7 K1 c W8 a2 H
- {+ e. b9 }/ P5 `1 h) ^8 b
- printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);2 [ v4 W6 [" {1 h/ R5 J0 i
- exit(1);
X8 ^1 e& Q0 d* j- n' D - } l3 h8 Q T# d1 M6 |7 t/ \% L
3 e# _/ b+ `4 ?9 i: i) W- // server_socket用于监听
6 [7 f# s) y- E; G - if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
" i2 M- B* {) V2 f - { m& X# Z) _, s2 g- x5 O0 x
- printf("Server Listen Failed!\n");
% E) F% a& j9 P; _! G) Q - exit(1);5 K1 ?9 N! t3 M, G# u% ]# T6 D. P0 R9 b
- }
9 d" }' V' b O! u" T' e - ( w4 j- s4 z6 Y
- // 服务器端一直运行用以持续为客户端提供服务
9 M1 @: B( F9 B: ?+ x - while(1)4 t$ ^( G3 W: G& `; l8 J3 l
- {; ?5 e1 h; R% [; u$ h/ w4 I' x7 ]
- // 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
6 u) e. L: R4 Y3 `* g& g" g5 E1 P& Q - // 接受此请求,同时将client端的地址和端口等信息写入client_addr中
' G; H8 X ?" g& }9 O - struct sockaddr_in client_addr;
: A1 z& d% b6 [/ U7 p- _) } - socklen_t length = sizeof(client_addr);1 j! X+ j% y9 O- J! F
- " o' G8 ~: B2 e4 Z8 @
- // 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
( Q0 N4 V; m2 K; }% \ - // 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# t3 J6 Z& M/ r( ?9 T; C2 x
- // 用select()来实现超时检测: V7 X$ Z& m$ a
- // 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
0 [( [0 p0 N0 i/ C. C - // 这里的new_server_socket代表了这个通信通道
% t: z, Y% N+ y% l/ Y - int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);" J) i$ |+ s. p3 \
- if (new_server_socket < 0) K5 a& f+ d+ P7 R
- {
1 n. q8 ]' ?* ] - printf("Server Accept Failed!\n");! K# W! \# @; _, C( l. z3 f
- break;
& G. y; R# N" `# F$ j! d - }: z; n3 F1 K( X4 g- G6 l' r0 U
- . P- }/ C& h3 F
- char buffer[BUFFER_SIZE];# O' c, n+ k- S+ I, f
- bzero(buffer, sizeof(buffer));4 t+ u+ g2 b: p, `& D
- length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);- Y$ K1 F& i0 x: R2 X' X
- if (length < 0)
$ B8 Y" u3 q4 R* N - {5 Z1 @# @- W! |: V# r( }: ` u, }
- printf("Server Recieve Data Failed!\n");
8 |- L) P( k, H3 B - break;
, }! C) ]! a& F0 W* N9 S# x - }+ r# n% N3 l7 x z. o
( P% }# F7 V0 D' z/ u- i- char file_name[FILE_NAME_MAX_SIZE + 1];
; T, E. X- a: j# E2 P5 O J9 s1 X - bzero(file_name, sizeof(file_name));
+ q3 G9 o4 R- M1 I3 ?. d0 Y( ] - strncpy(file_name, buffer,
: Z5 E2 \8 t; a" D t; w$ f: K2 W - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));
; b1 X: l5 Z8 g0 L; O( I& b3 M
" {$ s4 T) H0 P5 ~- FILE *fp = fopen(file_name, "r");$ M8 s: Y( t" u. A. c$ T
- if (fp == NULL)8 B, a+ B/ ?+ D$ `
- {5 ~. K. r: a' B/ x
- printf("File:\t%s Not Found!\n", file_name);
, S* ^# j" |) Q) d - }, A) H; M. E# n/ l5 c
- else/ D- C5 B# v' ?& D' J' u
- {
' V( Z5 B/ I. k+ l" K5 k# { - bzero(buffer, BUFFER_SIZE); \, j1 L+ Z& H6 e: v% p$ L/ \) v
- int file_block_length = 0;+ W: y: K4 C3 ~2 h) i
- while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
; J8 J7 i. R4 t v& q - {+ m9 x5 [2 t k; o- D
- printf("file_block_length = %d\n", file_block_length);, g6 g1 s W$ s3 m ?' O
- 1 {9 [" \: n7 }5 ^% \2 Z
- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
" a$ Y2 @1 n; A! W- ?3 w - if (send(new_server_socket, buffer, file_block_length, 0) < 0)
1 K0 n' L, ]- z: X' x$ r! K - {% G- ~# G- K. p
- printf("Send File:\t%s Failed!\n", file_name);% a$ F, d& V9 M4 K
- break;! a: Z5 q1 K1 T+ q s
- }% S, E. ~+ q* p* u- }9 Z& r
) o+ \/ V) H" X4 {- bzero(buffer, sizeof(buffer));5 K% V1 L7 A4 m; m1 w* c+ }) y
- }5 M3 ~$ U% V6 D. _' @3 q4 k
- fclose(fp);; z5 e- f# U# [# U; L& N
- printf("File:\t%s Transfer Finished!\n", file_name);# q+ z) v4 K+ G8 v+ ^) @# n+ s
- }: w# z: g: W' w
- % H/ m# e; A' ^! g
- close(new_server_socket);9 N @* Q8 f8 N5 b$ `$ u
- }
& ~2 c& c8 J D6 y3 N- G) \ - * W7 \" `; Z# C3 }( X0 ?
- close(server_socket);
" j& ~2 t; ]# O: {2 x3 O. ]* y - , u$ W3 }+ t6 ~0 p0 D! E
- return 0;: _( R# M q8 i! B/ A1 v: g" y
- }7 x$ W' J/ C- G* G+ _# l
8 e9 A$ {9 X, e! [
复制代码
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