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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.
9 d6 |4 a& O: z6 N8 N- /*client.c*/) t& F1 v2 u* s
- #include<netinet/in.h> // for sockaddr_in # r. }$ j! |% `5 {* i: E5 N, |
- #include<sys/types.h> // for socket
; O! Q& s& k0 t6 n% w- w @ M - #include<sys/socket.h> // for socket
; C& |1 _- X ` A4 Y ~ - #include<stdio.h> // for printf
1 f: k. Z3 S2 d+ o0 W6 x - #include<stdlib.h> // for exit
' l+ \% b* k6 ^% g3 o - #include<string.h> // for bzero
2 \0 _9 B8 Z* c: B% P; c. C+ @ - 9 o/ ?9 H7 \( x% j
- #define HELLO_WORLD_SERVER_PORT 6666 4 g( k7 [: l) W, @
- #define BUFFER_SIZE 1024 - K" j( i2 ?" u
- #define FILE_NAME_MAX_SIZE 512 * E) T T+ l* a
- . \& b2 E! }' ?0 x+ Z7 v
- int main(int argc, char **argv)
5 N% ]* I: O9 ? A9 \: j - {
* }6 g% _% F6 I8 Q - if (argc != 2)
% o* M5 Q- O$ K4 R - {
* u( k$ m3 U; a- I1 G4 A - printf("Usage: ./%s ServerIPAddress\n", argv[0]); * ]2 q. t- F4 c0 o9 U5 A3 D, B
- exit(1);
& R9 Z) Y0 ~! R/ s0 N" A0 j/ V. s - }
$ a& @9 C+ G7 b- y) U4 b
" s' |, c6 `" W+ v$ E- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
9 s3 i, D/ [% }+ ^( T7 W. p - struct sockaddr_in client_addr;
1 T; Z. _% ~2 p Q" q, `( ~ - bzero(&client_addr, sizeof(client_addr)); 0 K/ k5 I6 V7 O9 t; R! Q" B" e
- client_addr.sin_family = AF_INET; // internet协议族 8 o P/ [; Y) S, y. s- o6 q! r& @6 G
- client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址 7 B9 a% V/ Q9 j' M3 U# S, v
- client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口
9 u% B% g/ O" X5 U6 V! `
: [: p: O; x1 B- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
1 p. S3 i$ v% O: Y a* v - int client_socket = socket(AF_INET, SOCK_STREAM, 0); 8 ^( `8 Q0 J; k5 |2 j2 t/ f
- if (client_socket < 0)
4 p2 o9 o8 ~" x% t7 g - { 1 E3 O1 P3 l# d1 y9 j% R3 d3 s
- printf("Create Socket Failed!\n");
; M8 j+ @9 X2 I% A: f - exit(1); + G% B$ k% t- o$ x4 i$ s
- }
/ e; M! p$ r1 W3 L( t# V0 P - * X# c0 `6 X4 J ~) X+ K; J* {+ S
- // 把客户端的socket和客户端的socket地址结构绑定 * j- I3 B' }" E h+ T" F: t5 z
- if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr))) : S6 ^" j2 m/ c, O
- { ) k- O% N6 z5 s2 j6 h/ y; m1 U
- printf("Client Bind Port Failed!\n");
4 W3 R) i- ?( G: W- H - exit(1); " U: U* q* F& z+ t: F! Y
- }
, s, m$ W/ T h! Q4 t - ' [7 o! a, s% m1 l' T
- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口
+ A6 p; O# i; j3 @/ n! x% k1 u - struct sockaddr_in server_addr; 6 a1 u u# C; h5 X! G
- bzero(&server_addr, sizeof(server_addr)); 1 K- x7 Z5 D5 p* c: c P* Q- w
- server_addr.sin_family = AF_INET; / g t' e8 M! P5 \9 @' H
! \$ m |3 ^4 B. E# Z$ e- // 服务器的IP地址来自程序的参数
# A3 T3 |5 Z0 Q: y. T s - if (inet_aton(argv[1], &server_addr.sin_addr) == 0) % F1 j7 _: a4 T- [7 `- G# X
- {
7 n9 [0 L) g$ a - printf("Server IP Address Error!\n");
2 P' ?( _& n+ f. t% U - exit(1); & a- G( E0 h- Z9 j! }% {
- } # s- ]: t: p& u+ M; J9 A9 I
2 C c# C! t( k- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
# R/ M( U. x* J9 Y/ j - socklen_t server_addr_length = sizeof(server_addr);
+ h& c( {; R/ [7 |' D
+ N4 [( _8 O3 X' [- // 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 4 c! P( n3 C8 M) _$ f
- if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
" W5 ^" C- x0 C; b; r( [ - { n% N0 q: S% f7 I5 c; P
- printf("Can Not Connect To %s!\n", argv[1]); % d) v2 g8 w5 v( B* L
- exit(1);
! C3 U! d0 R( m6 v4 o. s - } % G; l1 d! I3 o" R( P V8 g& j, U
% ~+ k9 O% ?+ u% X/ H' |- char file_name[FILE_NAME_MAX_SIZE + 1]; $ }, |5 O# ~0 _3 m
- bzero(file_name, sizeof(file_name));
' T( H1 o1 K4 C* o5 P" r- Z$ @: e - printf("Please Input File Name On Server.\t"); & ]" F# `% @4 e0 P& L1 w& }; [9 H
- scanf("%s", file_name); ; d- P( K1 {' ?( P& H8 _$ ~
- 5 S) K* m) W/ o0 I4 }
- char buffer[BUFFER_SIZE];
6 y: p) p. X3 a! K: X7 C - bzero(buffer, sizeof(buffer));
9 |# x. E5 o1 a. G; S - strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name)); 8 z5 t, d: M. g* f9 t$ H4 q
- // 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
v+ x* q. p# i. T0 |2 g) t& N& V - send(client_socket, buffer, BUFFER_SIZE, 0); 8 v# Q3 M5 q0 s+ i* z
: g" S+ {$ U8 p% E I* i- FILE *fp = fopen(file_name, "w"); / X2 K9 z+ V. b, m+ f5 W* h& E
- if (fp == NULL)
8 w3 G1 l% G1 i9 Q1 B; E - { 7 |8 [3 y9 B8 U
- printf("File:\t%s Can Not Open To Write!\n", file_name); ' Q. `) ~3 H; d0 ]8 X; K( p
- exit(1);
, N! `/ ~& B* D& J, h$ T - }
( W7 Y1 n$ D8 @: p' g
$ M$ X# m- x$ |' {4 i0 g- // 从服务器端接收数据到buffer中
" c( }( n- @' R( P% N - bzero(buffer, sizeof(buffer));
0 V# R _ x7 q0 K2 j9 J5 r - int length = 0; ) v! y# v5 T! y% O
- while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))
& u0 x9 [% V: S( f0 F: y - {
2 A! x6 p4 c) E- K: |/ A - if (length < 0)
/ i4 a& L2 b7 j6 H2 a - {
7 v6 q" z9 x3 Y3 C; U, z - printf("Recieve Data From Server %s Failed!\n", argv[1]); ' [3 i: h0 o$ Y/ ~) n3 P" o' }
- break; & W8 |& F& H6 E v H
- }
1 G* \& r( {& [/ Q P0 _ - 4 V v5 Q! i4 F4 k4 t* i# i" H
- int write_length = fwrite(buffer, sizeof(char), length, fp);
; }1 H; a& S" t. ` - if (write_length < length) * j; A+ d' K& l, S
- {
: \4 e0 @5 | T+ P5 z# ` i4 }' F9 s - printf("File:\t%s Write Failed!\n", file_name); ( w) L% Q3 W. `/ l1 j1 i8 C$ k* F% q
- break; 0 @) g: W* Q( ^, V3 h) W" L/ D, n% \
- } 8 x6 W5 F/ t! c) U0 t8 F \; s
- bzero(buffer, BUFFER_SIZE);
$ A+ C# t' a; T1 S* N; I7 y8 C - } , I; r$ S2 b& y' d- X
- ! m+ j7 z! x1 z/ C, \: ^
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]);
* L9 W7 |7 J+ Q; ?5 S - / ~7 e& P* @) o- h9 h
- // 传输完毕,关闭socket
5 H. M+ K) x/ [ - fclose(fp); * F0 L% C, v- i7 X1 b1 z
- close(client_socket); ' b g8 ]' \8 k k$ W# h
- return 0;
# j, _- P& i! o3 t* ]# ]! g - ; ]0 a @6 \# ]9 I1 F& e
- } % ?7 [8 R, o* D: s
- 1 k% A3 k2 o7 n8 u% I' Z, q
复制代码- /*server.c*/
2 v2 x. Q0 I0 B" M+ X - #include<netinet/in.h>
, b. E! R2 u: h' N6 q/ s. G+ _ - #include<sys/types.h>
K2 g' M' [& G% F4 Z - #include<sys/socket.h>
/ Q$ @' K7 i; m' Y7 G2 X - #include<stdio.h># K" \ a" q# i$ ?0 t- k. E- P
- #include<stdlib.h>/ g( O2 f# h% q- H7 Z2 d
- #include<string.h>2 [/ h$ V+ P5 E) e- @2 {
- 5 z8 G" m& d4 O: ?. H
- #define HELLO_WORLD_SERVER_PORT 6666 //端口号5 x3 n8 e/ _& c' Q9 ?' g
- #define LENGTH_OF_LISTEN_QUEUE 20* V- r4 J" D' \5 i
- #define BUFFER_SIZE 1024
w( A5 l& Y5 u1 B - #define FILE_NAME_MAX_SIZE 512
$ E4 e# O) v5 ~/ n
$ G; `$ G) h) W- A f7 K9 g- int main(int argc, char **argv)
$ G/ M' C4 E7 c1 r8 y* M2 A3 ^1 C1 p - {
! G8 X5 D! g1 q1 k9 D - // set socket's address information
9 U7 N! ]* Z: j/ y - // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
: u3 w+ n2 G0 r1 r$ P* V+ ]2 F) H4 Q - struct sockaddr_in server_addr;" t7 k! q& w& I& Z7 }9 a
- bzero(&server_addr, sizeof(server_addr));* g2 i& G- z+ z! j
- server_addr.sin_family = AF_INET;. I) K1 w. N/ W0 Y7 n' I! n, R
- server_addr.sin_addr.s_addr = htons(INADDR_ANY);
- H/ ^" \5 x6 ^+ G f; g0 c - server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
) c' Q% q8 n* [# i
9 B. x2 O7 B5 C8 G0 s- // create a stream socket
1 [2 P1 B6 j2 o4 |% \1 E1 V( |( S7 {2 O - // 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
& _* ^/ r e6 J, K* V* ? - int server_socket = socket(PF_INET, SOCK_STREAM, 0);( G+ ]- I3 v6 `1 c; X2 {9 ]0 e7 I
- if (server_socket < 0)/ D0 G4 M: z y- ?7 |3 D7 {7 n0 G
- {! U! W; i+ `4 ]- y
- printf("Create Socket Failed!\n");
# Q, R6 n1 v$ Y7 X0 Z3 X5 q5 C# T9 b - exit(1);, n0 E: U2 N# t) H5 y$ L; H- o
- }4 p% q9 C, ~& ` R! R' e
3 _! K/ H5 N- H6 ~- // 把socket和socket地址结构绑定
+ |* r6 A8 u6 Y4 P9 b6 j! l - if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
( A0 Y& J; X* r, c3 ~0 q - {3 v+ y- q, s" p% D
- printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);( C. l* [% P4 h4 l
- exit(1);
# K6 B4 Y/ M7 A5 Z/ F - }
2 ?' j4 l" Q! w* A1 ?5 O
Q* U' S: J, \- // server_socket用于监听4 i4 u9 C% Z1 q3 c. R
- if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))9 a9 K) p* R! G7 }0 Z0 M2 |
- {" b& W( G7 `3 i, m$ r0 j$ M
- printf("Server Listen Failed!\n");- K# N8 I0 _$ e1 J$ A9 u# e
- exit(1);( a0 Z8 x! w: k8 l: Y
- }
4 b5 x' ]8 K6 H. R+ p8 w
5 g6 H0 k3 w- U/ G' O1 _- // 服务器端一直运行用以持续为客户端提供服务9 x4 I; g' V+ i9 J' g
- while(1): ?" M. W: s7 i3 D- I% V
- {4 K6 T' s, f/ Q/ X2 Z+ h: F
- // 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: ?9 W- m5 N2 {' o2 G3 D* 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7 f1 s& P) d4 n1 z. k+ G$ o
- struct sockaddr_in client_addr;+ Z- K6 N8 Z+ c+ Z. {4 b
- socklen_t length = sizeof(client_addr);
! E2 w; M5 C9 l' B: X' B' @ - # G& q3 ?! I9 _7 @9 S$ j
- // 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4 @7 ^) a! v" ]& C' I
- // 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. T+ }8 [% {- i$ N) E& @
- // 用select()来实现超时检测* V5 B% \2 J% u, j* S5 x5 P
- // 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" W; P$ B8 Q7 s1 T2 w$ b
- // 这里的new_server_socket代表了这个通信通道
( O4 {9 s8 x+ g; `. p - int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);1 c$ h# n& o7 M+ c7 M2 X
- if (new_server_socket < 0)
5 |& C. J j( R; l4 P+ g# w& {7 e - {
: y/ S4 u/ ^+ w& v% c9 Q - printf("Server Accept Failed!\n");5 [. w. M. l$ m& S& v0 E
- break;
n: ^* j( A1 _0 L+ ~4 ^( } - }) P t4 u4 E1 N+ F
- 8 p {7 V4 l' f5 E
- char buffer[BUFFER_SIZE];
! Q; k3 j7 t' Z% H" o - bzero(buffer, sizeof(buffer));7 `, \0 l# b; h* e
- length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);% |/ V3 c6 ], n$ L+ r
- if (length < 0)9 e% C1 S( \8 Z; \; @, j) C
- {3 j) n L- O8 w6 g; a! N$ Q6 A
- printf("Server Recieve Data Failed!\n");- w; m7 v& S" L7 O
- break;
. e9 Z8 l( g4 o* t9 ~ - }
8 l) H& x. p$ N* H, e# C6 w - ; I( h) q. h7 W# w: E3 q+ K7 [+ u4 Z6 _/ b
- char file_name[FILE_NAME_MAX_SIZE + 1];
% y o/ c+ N6 m3 N9 h - bzero(file_name, sizeof(file_name));2 e9 L j5 `/ X
- strncpy(file_name, buffer,
- X7 R/ @0 e6 n$ w0 l - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));8 B, X I. p" M& t, Z7 U
* u) u, D; M R; h% Y0 K) J) ^- FILE *fp = fopen(file_name, "r");7 F4 {5 d( g- I& {% T7 M5 X5 [. V
- if (fp == NULL)
& S' w. R1 C, G0 I6 M - {
1 ]" ~' C1 Y6 G7 ^ F* A4 r+ Q9 U - printf("File:\t%s Not Found!\n", file_name);
0 }* ?% u3 M; k+ \* j$ a - }
. b7 ^7 u5 \' Y. R; N - else
7 b. g! h' E9 u k - {1 M5 A, J) l, r7 z0 b
- bzero(buffer, BUFFER_SIZE);4 a" {: `$ g7 \6 E
- int file_block_length = 0;
1 P# o& N+ V8 b! Y) t5 v - while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
P/ R6 S# k; b' ~* |1 V - {2 G: M6 n7 j6 M' v5 ?
- printf("file_block_length = %d\n", file_block_length);
1 J @8 m' M* b$ m) v - ; O/ }" I) [4 Y8 M
- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
1 z) L4 ]9 E( j4 b9 W, P - if (send(new_server_socket, buffer, file_block_length, 0) < 0)4 ^$ r) }* @) D
- {, V# I0 Y' }" A
- printf("Send File:\t%s Failed!\n", file_name);% O1 n, N& I2 g C, E( ]7 b8 \
- break;
+ S- C& ?8 D6 P+ { - }
, J/ }& u5 J1 C0 c+ J* P6 ]# t - ; L# @ `8 h2 v: L+ C% F- Z4 ^+ D
- bzero(buffer, sizeof(buffer));4 i. o. {& N b0 w& i7 w$ L; P1 y
- }
6 a$ j# g$ `6 Z" b* \ - fclose(fp);
" H/ |4 F8 `3 w; ?, T8 `3 H6 k: |4 l( Z - printf("File:\t%s Transfer Finished!\n", file_name);& @ h, `/ D) f/ w* ^2 M' L
- }# C' `" m4 s, x( m+ o8 ?! _
- , g* D9 C9 [2 I5 y( P, P! \2 N6 c
- close(new_server_socket);4 W5 s& v: y3 D% L
- }8 ?- x5 d0 f4 I# c9 f3 V
! r- h8 v8 y6 e7 _* o- P- close(server_socket);0 r8 {0 K: f2 M
' u9 L! [ Z+ \! q8 Y- b- return 0;# D0 u# ~* F9 Q
- }
4 O$ @1 m: W1 q3 A+ v: Q - # V: Q p& v( H' J3 x
复制代码
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