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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. s0 z# |; Y* r# d5 n
- /*client.c*/
4 C: y- ] @9 } - #include<netinet/in.h> // for sockaddr_in
% G6 x( ^- ^7 ^ - #include<sys/types.h> // for socket ) a/ u! ]! Q C3 V( I1 z0 I
- #include<sys/socket.h> // for socket
. Z u& b; P Z - #include<stdio.h> // for printf : v+ e; p2 B# G# z
- #include<stdlib.h> // for exit
1 `; j0 G5 b9 s0 x8 Z: m* r, n1 d; x [' U - #include<string.h> // for bzero : J/ A L0 k+ E( Z+ d
- 3 D S4 W7 a5 Z, f
- #define HELLO_WORLD_SERVER_PORT 6666 ' Y! R7 \8 C6 C0 Y3 `" e1 a
- #define BUFFER_SIZE 1024
& n, V8 ~" \( w+ y# v, a - #define FILE_NAME_MAX_SIZE 512
5 k- o* e0 _) d' k! G: t - B6 L# ~" L9 i
- int main(int argc, char **argv) 5 m4 C: s+ ^) n! P
- {
% e' p* d6 Q% j, |0 W - if (argc != 2) ( r& q' {/ R' ?$ i3 J* p; @; U
- {
& A0 J: ]: c" o9 U- P) z - printf("Usage: ./%s ServerIPAddress\n", argv[0]);
r" x9 L8 ^+ |( x3 w0 T; e - exit(1);
W1 b8 l/ V$ g7 H - } : o0 Y9 d! @6 n
* Z0 l5 s- U, U+ V c- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口 E$ L( e0 P8 x) V: [' k6 u; |7 y
- struct sockaddr_in client_addr; $ Z/ u7 } w3 z2 H
- bzero(&client_addr, sizeof(client_addr)); * S9 X& K4 q; h0 G
- client_addr.sin_family = AF_INET; // internet协议族 ; s. d) z: y: n5 j% b' u) G, W3 d! f2 q
- client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址
) @! R: k# i b7 j3 W - client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口 $ `' r4 ^' D; O+ ?
- / {" z0 n3 A* `5 Y* z9 @
- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket 9 k8 P7 p" |: H8 ]7 T' q
- int client_socket = socket(AF_INET, SOCK_STREAM, 0);
$ g4 c7 _8 b# y* E' m. ` - if (client_socket < 0)
. G6 Q; `& t5 t% _ - { 7 g" z% [" z5 e l9 k1 `6 u" s$ c
- printf("Create Socket Failed!\n");
0 P a" R/ d9 m9 Q: R7 A - exit(1);
* ?: o2 J' A% ?7 R - }
5 v M, x9 c: b' K) B9 }
3 ?; C* I3 w; p; i7 O# n5 ?: u6 W- // 把客户端的socket和客户端的socket地址结构绑定
8 V+ S% W% R _ - if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr))) ' h7 O' c o6 m' N' k2 @
- {
, X0 M8 M2 h! A# s9 c9 I& I( L1 y - printf("Client Bind Port Failed!\n"); 2 a c7 K; q- T2 b6 a
- exit(1);
* ~4 T7 g; W5 \+ U - } 7 d, J5 [6 m- K7 ]
* U) @8 n& O7 b6 _- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口 3 N+ i, p* F/ B8 M0 v7 }
- struct sockaddr_in server_addr;
1 m) y+ ^9 O0 M a0 J, |" I - bzero(&server_addr, sizeof(server_addr));
/ W& Q n! r" t1 O7 w# G - server_addr.sin_family = AF_INET; . k$ a& \2 ^* `+ }; r0 c ?
6 r9 I( x4 _0 z+ ?# |. n" y* M- // 服务器的IP地址来自程序的参数 8 E# }4 ~# `. q4 _/ @
- if (inet_aton(argv[1], &server_addr.sin_addr) == 0)
$ j1 Z& [0 v" @1 K6 C) F - {
7 i3 J! b& O# ^ - printf("Server IP Address Error!\n");
7 M* e! c; Y+ K( R - exit(1); 2 m- ^+ z0 ~9 ]$ X9 q
- } / F/ F* ]( U/ r& A5 T
2 C. \8 ]9 ~2 V0 |4 U: d$ t- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
7 I$ a; w8 P! O0 b" k/ ]" L1 c* o- f - socklen_t server_addr_length = sizeof(server_addr);
4 f. D* ^) K6 l4 Q6 c - 7 F, J& P! j4 N9 p1 n: O( }
- // 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
1 t8 B( `# V7 X- {" l9 b" I - if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
Y$ j8 Y5 v2 N1 \ - {
# g) F6 X8 ?8 j# q, ? - printf("Can Not Connect To %s!\n", argv[1]);
0 u! A$ w3 J; D+ g - exit(1); 8 l0 A( {: s4 r% F5 p3 e
- } # _% ^' ]# ~3 F% D6 Y; U" e8 f* L
$ |# u( ^/ s% v- char file_name[FILE_NAME_MAX_SIZE + 1]; " U* x) `0 h* O) n3 I
- bzero(file_name, sizeof(file_name));
( w. \5 T( w* @$ v! k* }" \8 D5 x* N% k - printf("Please Input File Name On Server.\t");
* N: h$ ^8 B* ]3 {/ |5 C4 Z - scanf("%s", file_name); 1 K. r( C# V% U- {
- 4 V4 G4 J& w6 K7 C
- char buffer[BUFFER_SIZE];
# J; X3 u n q! W6 p e2 ~ - bzero(buffer, sizeof(buffer)); ) W1 d+ U6 K# {% S
- strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name)); ( ~% S; v) h, U/ [4 H0 I9 r
- // 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 6 Y8 x9 W& ^) f! s' _ n/ Z9 H
- send(client_socket, buffer, BUFFER_SIZE, 0);
! G0 a1 z3 H" _8 u
, K+ f) {1 r% z$ }3 D5 }- FILE *fp = fopen(file_name, "w");
7 }% g* k2 I; k& B - if (fp == NULL) 3 S5 F/ L/ G# J7 x) S, j8 u( O3 M
- {
+ y' x: q) f( N$ J - printf("File:\t%s Can Not Open To Write!\n", file_name); & u% i: Q# d; K+ I8 B2 p
- exit(1);
- x- H2 }4 i, |4 ]- r, B6 h$ G - } 1 P/ }+ r- R2 T
- 0 z; }0 I8 J8 o1 D
- // 从服务器端接收数据到buffer中 J2 w7 q, | N( q2 G9 P! h
- bzero(buffer, sizeof(buffer)); , J2 _' m- q9 o7 {$ b
- int length = 0; 3 `! T7 r! w2 }
- while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))
" W0 ]; ]5 F0 o) Q7 F, R8 O' ~ - { ) `0 Z6 t( n& \7 Z1 t
- if (length < 0) % O* U1 U! M8 b! P( ]$ o
- { 9 L7 e: A1 A3 g# W
- printf("Recieve Data From Server %s Failed!\n", argv[1]); 3 L" D: p3 R- F
- break;
" H/ O- J9 t W* c: @. P/ j - } 6 A: Y9 f$ b! K
- ' }% _6 w* e" n- Z2 A7 B; P6 e
- int write_length = fwrite(buffer, sizeof(char), length, fp); ( @# o$ I* o/ U
- if (write_length < length) 3 L. |# P9 U! V2 K3 G
- { 3 C6 \! r, b7 Z0 c: y
- printf("File:\t%s Write Failed!\n", file_name);
& R( f- S9 g/ ^$ v( q+ {, U6 K - break; 0 [6 K' @$ h- ?5 k. o0 q+ e
- } & v+ r$ W, R9 t" A1 r2 H( a X
- bzero(buffer, BUFFER_SIZE); 1 ] A0 G/ h! k G/ T$ n" ^3 F
- } 6 d/ h+ f2 h( h0 x0 R; n
- , i7 I! }5 k: Q0 h3 I
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]);
$ u/ U! r% c* y1 p( F0 Q, Y
4 O( Z" j- {' E! U0 a) y# V- // 传输完毕,关闭socket
+ n7 ~* h L% v- j% D9 E Z$ z - fclose(fp); ) T" @) ]$ m; b1 e! _
- close(client_socket);
8 ^( o! `$ R/ G: [9 [ - return 0; 2 g! O% k' T5 k& Y
( L9 ?' x8 Z# w7 Z* M6 r- } % M; O8 i5 x$ j# ~
- ; v: g0 u/ D, C$ j6 s) f8 m; j4 M
复制代码- /*server.c*/
H( ~" U5 `8 u - #include<netinet/in.h>& n6 A8 s' i6 [/ g
- #include<sys/types.h>" _0 f( V7 I: s* j
- #include<sys/socket.h>
% R8 t9 H# _6 C8 q* b - #include<stdio.h>
, X+ A+ ]! p: J8 P - #include<stdlib.h>
+ w- ?( Z- u& _ - #include<string.h>% e4 t0 c: I/ ~! M$ A
- $ \: ]1 P. G7 z8 t! P
- #define HELLO_WORLD_SERVER_PORT 6666 //端口号0 \, d7 D1 ~, _1 l* t$ g& _: z8 C
- #define LENGTH_OF_LISTEN_QUEUE 20' g+ R/ R: g! k: ]
- #define BUFFER_SIZE 1024
% }! U2 c( E& r2 \3 d$ V% L _) L - #define FILE_NAME_MAX_SIZE 512& I+ i& p0 ^) A& N- z& h. b
- ' }6 P: i' x9 F$ M0 h% m6 E) T/ T
- int main(int argc, char **argv)
$ w+ ^2 C6 m8 l! H - {3 w# N. f3 z) o
- // set socket's address information
" p5 }& n0 t9 H- G8 l0 B - // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口- a2 R! ?) K8 i6 @8 Y/ l9 Q
- struct sockaddr_in server_addr;+ g' E4 ?6 r3 R+ h
- bzero(&server_addr, sizeof(server_addr));
9 m( \. g+ a* v4 ]# p0 z" U: Z3 O - server_addr.sin_family = AF_INET;
" |3 j4 x! }+ K9 y, q" E+ b - server_addr.sin_addr.s_addr = htons(INADDR_ANY);) T" o; ^, Z7 L, D3 R# W. T7 O
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);; Z8 _8 U4 L# b; ^' o: l8 u
- * x. a( O- ]- Z9 ?
- // create a stream socket3 }" _: l1 w C+ z5 Q
- // 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
' s, N! m- k$ Y9 F. z0 ~6 Q6 s- k4 F/ I - int server_socket = socket(PF_INET, SOCK_STREAM, 0);
& ~; {5 G6 x4 W) z- k5 P - if (server_socket < 0)0 X2 l/ Z; [7 Y0 Y4 T1 F ]
- {
) l2 R D" K3 C7 I% ^ - printf("Create Socket Failed!\n");' I6 M a4 M7 G5 }: z1 b
- exit(1);
$ l$ G! A1 ]9 D+ [# b9 R - }7 m/ w4 ?% `$ L* n2 J; ]" w& |% G
% O$ y& f/ i) N) p- _0 a4 C# G- // 把socket和socket地址结构绑定
6 I1 k9 K1 q# o1 \& f) B+ G+ h - if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
4 d; U( W3 g: ^; a, Y4 m$ H - {
' w3 F6 j# I6 C, L( Y - printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);
3 D/ }: t9 o; F$ I4 u - exit(1);) N9 X7 ^! ^' k+ q- y9 v+ U
- }
- {2 K' x8 M- T" F, J) t
! t, r/ Q& g* Q& R- // server_socket用于监听
" n# ]# \! Y! ^1 l9 e) X$ z2 a - if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
; M6 M$ M. y0 R8 k' p; w6 z - {$ N: g3 u5 y3 q; t8 P3 g
- printf("Server Listen Failed!\n");
0 _$ L- \. V6 Q+ `& ]* [ - exit(1);6 T( R% @. Z a
- }
) G7 ?( p" j! O# v! V1 i
6 i$ e6 }7 Q* [. ]' ]1 S0 M- // 服务器端一直运行用以持续为客户端提供服务
& h: Z9 D$ M" ]5 H, H0 \) @ - while(1)
# [. z9 |* S- Z% {/ Q9 } - {+ P6 @5 h6 {; E0 R
- // 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- G: W5 m& {" B# O- O' W" y% C
- // 接受此请求,同时将client端的地址和端口等信息写入client_addr中$ D& a/ v5 b; p5 n7 x
- struct sockaddr_in client_addr;+ F7 c" G# v \
- socklen_t length = sizeof(client_addr);
, q: x+ S3 G* q$ y - * g. x; @$ F! f; U' Z
- // 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
+ v* Z; U! b+ a8 F - // 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
5 j6 R, |/ v, J& Z: \+ O - // 用select()来实现超时检测4 b T& n3 z8 h/ M; f" S' q$ Q* 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
3 P* u" Y8 q+ N1 x - // 这里的new_server_socket代表了这个通信通道$ A* ?0 Q, h8 ]3 m7 y
- int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);
$ E. C/ _1 N: T* E7 s - if (new_server_socket < 0)2 c& m6 d8 e3 q- n- K) d8 C$ m
- {
1 `3 M, p& t$ ^! A; A5 w. S - printf("Server Accept Failed!\n");
+ Z* w) B) |$ o L/ W2 d6 h - break;
3 K5 t, _2 I% ]6 |6 g) T: ` - }$ U& h# z9 y+ _; i# V* T
. Z) @- `3 ^7 M. O n- char buffer[BUFFER_SIZE];. k* b( N- v8 Z6 q
- bzero(buffer, sizeof(buffer));" X/ b) a7 }& m/ j# R
- length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);0 E* k' q3 ]/ M$ G
- if (length < 0): l( A& E* [4 l" ]3 w
- {
. P5 a4 z' K# T0 ^+ g9 F - printf("Server Recieve Data Failed!\n");* I% w9 O) U, u" s
- break;) @* s, i s+ o4 O
- }
+ J# E/ ]" X9 p8 { - / t$ j* o5 W+ P6 O
- char file_name[FILE_NAME_MAX_SIZE + 1];: c0 g3 Y; ]" B2 f7 |1 j U
- bzero(file_name, sizeof(file_name));8 `) I2 W2 n# d4 [3 B' ?# X
- strncpy(file_name, buffer,
! r. S1 O. t7 J1 d* d - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));, ?$ ~; i8 x* x8 V N( t% Y% e+ O" W
- 4 b* U% U1 V6 r8 I8 r
- FILE *fp = fopen(file_name, "r"); s7 K# f' f ~* c( U* P/ M
- if (fp == NULL)
8 w) o: Y+ G; ~+ l - {
9 r9 J: W; u* c) N; ^ - printf("File:\t%s Not Found!\n", file_name);
+ O8 q& `/ N; T. t - }- t$ _' G# C# j, m" g
- else
! W! Z; z& o: f - {" P4 ?2 [/ N' W# }
- bzero(buffer, BUFFER_SIZE);0 h9 D: ~$ `8 m4 [
- int file_block_length = 0;
+ P, p+ c) ^" I6 i* e - while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)6 \' }% P/ f* G7 V6 b
- {
4 |! s: \" _* Z - printf("file_block_length = %d\n", file_block_length);+ X. \9 O3 u, s
& d7 w; C6 {/ A* h- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
; T, y: S1 i6 Y0 `4 N1 w - if (send(new_server_socket, buffer, file_block_length, 0) < 0)
! {' o: O2 T" N& } | - {) ^" S7 j( y, O/ @4 M$ j
- printf("Send File:\t%s Failed!\n", file_name);0 X( r) w# G1 w/ W, l0 O
- break;" m3 ~; `5 B( z5 p; ?# t" x; M" P1 u
- }
& ]1 Q7 C: k. j0 H0 J5 ?2 M
, I! S- _6 L& y. h" x5 P1 g- bzero(buffer, sizeof(buffer));, C d6 }4 j: M$ H! V# T3 k
- }5 ?, y9 ^; O. c" Z
- fclose(fp);) [4 M# X( d% k
- printf("File:\t%s Transfer Finished!\n", file_name);2 x4 a0 b/ r- v
- }' E3 O- g" {3 M! }! x" a; W7 _
- ' E/ f) ?6 c# W4 U
- close(new_server_socket);# @; w7 A& K1 n9 O. t( C0 C& u8 a2 l
- }
5 o8 v, B% o. G8 d6 \* G
1 e3 c, t8 a6 t: T- close(server_socket);" `" {" U4 L: k0 @) P. }1 [
- / F3 M; F) U+ V) R
- return 0;
- X$ x- a, D: T/ z! B/ d - }
$ }% T G2 H' b
3 |4 p) ]8 ^( m& ]7 k& q
复制代码
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