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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.: J/ M% G% H- k1 M0 ], M" m+ J
- /*client.c*/3 }- V8 @3 M4 e W0 O. Z
- #include<netinet/in.h> // for sockaddr_in
9 k2 w4 ]. k( E: f9 V6 f) x - #include<sys/types.h> // for socket
" O+ @/ i+ S o6 o# S4 t! p - #include<sys/socket.h> // for socket . P/ }' r+ c8 }. @/ Z
- #include<stdio.h> // for printf
; v1 ~# j& E/ \4 i - #include<stdlib.h> // for exit
" `, I8 ]+ T3 P1 V1 b/ d: j, c - #include<string.h> // for bzero 1 X, x' D/ U' M" s+ m3 e
- & ^3 q1 l% h: n2 x" S3 f
- #define HELLO_WORLD_SERVER_PORT 6666 H8 f: ?8 f; D5 c" \6 l9 }
- #define BUFFER_SIZE 1024 7 Z% Q" f% Q5 p, S$ D0 _$ N3 ]) P
- #define FILE_NAME_MAX_SIZE 512
: V7 H0 o0 R6 }/ n; b" M9 C V - 3 ]$ \* \2 _2 t( |
- int main(int argc, char **argv) / {/ s. u( U! J5 d: `
- { ' f; B8 e/ s$ P8 Q; ?- ?
- if (argc != 2) ) r( K; s1 q# X3 i0 [0 `
- {
* u4 y+ l) T5 m% W - printf("Usage: ./%s ServerIPAddress\n", argv[0]); + I% @! D- @) Z e K% h4 _7 J/ @
- exit(1); 1 ^- x+ n; b! w
- } " N, u R; F1 M
- 5 ]1 F# g% A+ p3 C: I# r) B* T9 |$ |
- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
9 [9 h3 H* E7 _7 ` - struct sockaddr_in client_addr;
1 R- D& E& g: O* I* E - bzero(&client_addr, sizeof(client_addr)); ' f, r. f* i, r6 i7 U B
- client_addr.sin_family = AF_INET; // internet协议族
: F3 n, T0 j/ A% g( n - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址
$ W! Y- k8 `+ o" B1 T! _ - client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口
/ w4 |% k5 c, f' b! `) J) i
7 b) q3 A& ~2 h: |& g2 ^0 s1 r- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
" J$ x- p0 q( ]! m+ D7 q3 J% D i - int client_socket = socket(AF_INET, SOCK_STREAM, 0); 7 ?; o. A1 y! n+ l7 k7 \
- if (client_socket < 0) 0 z3 J2 C, M7 u1 |6 B
- {
7 A/ d0 \; t4 w7 B# B8 E& @% [ - printf("Create Socket Failed!\n");
* A8 J# F; J8 a- H1 i( c& s$ f& [ - exit(1); ! Q6 V1 E: I0 d3 f2 T
- } 0 N9 ]7 |# X! A, w% G
% @2 P; D2 w+ ?% D( A- // 把客户端的socket和客户端的socket地址结构绑定 ( K3 P9 x; o: A# ?# I
- if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))
- U: Y# E9 v& C+ y - { ; |" T: w. B) j, H- z3 L l6 |. T
- printf("Client Bind Port Failed!\n"); $ ?6 _! m# X+ Q& }
- exit(1); ) R5 h3 ^ d1 Q m: h
- } 7 ?: G F* _8 D0 c) g7 ~9 n6 ]
- 3 X+ ^+ U# b; ?
- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口
+ W0 M- i& q: a P - struct sockaddr_in server_addr; ' a2 v" e* {6 k+ i ~4 ^
- bzero(&server_addr, sizeof(server_addr));
. z: L# ?5 |, e - server_addr.sin_family = AF_INET;
+ m% k5 Y" [( b. g) x) G. @ - & L0 F9 p: [; u- @ g
- // 服务器的IP地址来自程序的参数 & r. ~. N, b I, ~# f) d8 a& ~" O
- if (inet_aton(argv[1], &server_addr.sin_addr) == 0)
/ J1 `% G6 F7 l: Q( h& B - {
. @6 {0 X y6 g9 T) y! N7 \. M0 N - printf("Server IP Address Error!\n"); - }- i8 L9 x& h$ G
- exit(1);
, Q/ ^5 A; i+ O( N/ c& ?+ x - }
0 E( v% [+ D+ E, m9 g0 |
( F1 E$ s: H; U5 B; v1 P3 I5 I0 ^/ c/ b- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); * C8 U i* O1 m! r! z& o7 G+ p
- socklen_t server_addr_length = sizeof(server_addr); 6 b2 X* N. f6 g7 o* B+ m
- 8 ^! y7 C2 l3 b m
- // 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 a2 I+ k5 b/ m8 b0 \; f - if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
- n, J' d' H# X. U/ u - {
0 \- U% }0 ?$ l) T& J% F+ m7 ` - printf("Can Not Connect To %s!\n", argv[1]);
' J+ i. V$ N2 q8 H - exit(1);
. ]2 k3 J6 s: y4 `; p$ W8 ]. a - } ! B0 H0 I8 k' g1 [4 I8 F
- ; ?: h: ~( u! \2 o+ b
- char file_name[FILE_NAME_MAX_SIZE + 1]; 0 F* Y" k. c3 R$ E
- bzero(file_name, sizeof(file_name)); ~8 B7 Y% u' d" Z Q) d! B% a
- printf("Please Input File Name On Server.\t");
- M- ?# X6 f# f: m- Q- m- g$ N, Q - scanf("%s", file_name);
6 L$ {: g9 T% E5 s- D# C4 [" z! x
9 O3 u# X) P: a+ r- char buffer[BUFFER_SIZE]; : O' N+ Y/ o0 l, L9 q; j4 Y4 `
- bzero(buffer, sizeof(buffer));
/ O% p, E0 K" h. ? - strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name)); : E. O0 |7 t6 D3 l# D1 \2 h
- // 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 + P' g: t. n6 K: y" @* i% K/ \
- send(client_socket, buffer, BUFFER_SIZE, 0);
: E9 W8 h& \* @7 l
+ V2 h3 t; k1 ^* y- FILE *fp = fopen(file_name, "w"); 5 x B6 v* l. `" p3 ^
- if (fp == NULL) ) Z+ e+ \3 L9 }4 ]" U
- {
2 v' ?$ g" O) ?2 e+ U0 \ - printf("File:\t%s Can Not Open To Write!\n", file_name);
% e) j8 w' c' X+ A. x - exit(1);
, U: z* O$ f3 Q - } + i+ J' K8 L6 D- _! q& `9 ~
- 2 j7 Z3 E0 Q6 Q7 V3 W6 l
- // 从服务器端接收数据到buffer中 - C3 v) ]. q5 @, U) ^# h, M) P
- bzero(buffer, sizeof(buffer)); . F) x! b: v) j+ r* q/ W9 {' ^
- int length = 0;
& B: ^+ U5 w# E0 z6 h6 C+ v - while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))
5 c7 T$ c/ U: i* Z" e+ L - { ( _. Q$ b+ \$ o$ w2 l
- if (length < 0)
+ Q9 c) q' N" ~; D- s! R - {
2 m$ Z, l4 m2 X M - printf("Recieve Data From Server %s Failed!\n", argv[1]);
" H$ E; z _* i" n w - break; - \! k: R/ r% R" d* X+ D
- } 4 i. v, M- b! A) e+ z0 g6 J) w
* m% c( ]! R! H( o3 W8 m+ ~- int write_length = fwrite(buffer, sizeof(char), length, fp);
: d9 Q Q) u. k6 ~, A* T6 N - if (write_length < length) , ]6 t' c, r% K2 Z
- {
$ o( ^& v* Q+ o$ ^ - printf("File:\t%s Write Failed!\n", file_name);
1 b2 Q" D( G5 ]: |) C2 Q8 e - break;
5 i) s) [! k' d5 j - }
1 T) W: [5 R3 ? - bzero(buffer, BUFFER_SIZE); ' c9 R4 N$ T, c8 l* K
- } 9 D0 E* K4 i j& l F$ b
- , d/ Y' c* K K! Y" m/ j
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]);
$ Z( z8 l" G4 Q: V) d h7 p$ z - 2 k+ |5 L" y K$ L+ S% r3 s
- // 传输完毕,关闭socket 2 \, \5 g" }0 x% C3 x$ b. X w
- fclose(fp); $ g* B h7 m8 z( B8 n
- close(client_socket);
8 g- u5 ?; h2 n' t - return 0; 3 t0 n y7 O1 C# F! L1 ]* I9 Z ~
% G: K) G E, d' j0 G0 D: O- }
' E1 s0 h3 D* @9 d
) O0 Y. g: @5 _& ]+ `
复制代码- /*server.c*/
3 P% Y5 g5 z- C4 M - #include<netinet/in.h>
3 Q* e+ X) A; l. N' ^# L) P - #include<sys/types.h>4 T) a: w8 W! o, z* P3 C3 U/ e! b
- #include<sys/socket.h>) {* L2 z! v% ?/ j) A
- #include<stdio.h>
9 `. P7 s/ J2 ~ L - #include<stdlib.h>
3 L3 P( y8 m5 `4 D ~9 x - #include<string.h>: r" ^& i$ |5 K' E6 i8 ?$ w. h
- " P V9 w' S0 v" T+ R. i
- #define HELLO_WORLD_SERVER_PORT 6666 //端口号4 w! ? `' K% t9 s
- #define LENGTH_OF_LISTEN_QUEUE 20
; R* h( A8 Q1 E - #define BUFFER_SIZE 10243 y; ^$ I' l' D6 R Q2 P* F
- #define FILE_NAME_MAX_SIZE 512
/ ~% h* w$ u, y" |" C
/ B7 @, _1 K) a$ h; L- int main(int argc, char **argv)
6 s: U! P- e% W - {- S" G" T2 k/ ?. R1 b5 @4 `
- // set socket's address information
8 D. C) K% m+ Z8 Z/ I, [4 T* N - // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
" S* `, l$ d7 ~( o P - struct sockaddr_in server_addr;
; z, x" k6 h9 A$ b+ Y# G - bzero(&server_addr, sizeof(server_addr));( b! f5 G9 \9 ]! r4 x
- server_addr.sin_family = AF_INET;+ e0 e! L' d8 B
- server_addr.sin_addr.s_addr = htons(INADDR_ANY);
6 M( w( i% j- Z( B2 [# L - server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
+ p3 d* H6 d, g9 M/ \ - 8 w3 [0 S, s1 W6 d/ }
- // create a stream socket/ Y/ a1 Y/ _( \8 D: i4 i" K9 T0 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
+ m+ w2 s# X8 l4 h - int server_socket = socket(PF_INET, SOCK_STREAM, 0);4 d) D4 J/ T) U+ k* J/ S
- if (server_socket < 0)
/ h* Y/ x9 v# k% m; f1 ~ - {
. i5 A& @5 u$ A0 p4 a- b" i4 w - printf("Create Socket Failed!\n");
( S F& i( k( {+ W - exit(1);& v6 ^' ]/ x0 I6 K; t: y
- }
S; X. ] N5 \: ?7 { - % P2 i; g" G j+ O
- // 把socket和socket地址结构绑定& H Q( B! t+ Q$ m5 W" e y; A! E
- if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))/ B! L6 @+ d' y" j' \( f& X
- {" b# n0 ^" ~% m3 r( K! ^
- printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);
0 N1 U- b* S5 m - exit(1);% i, G, h! [: e: _! }
- }
3 @7 s, f9 r4 c3 v& C8 K6 d% t$ g
. y) F& t5 \8 \# L' E2 R2 R, D- // server_socket用于监听
( z- h6 L% ]6 g2 L) ^ - if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))3 t/ X' d4 C' A& V+ c
- {
6 @5 \# [& _* D6 S. v: Y% w - printf("Server Listen Failed!\n");% n& [( ^& j8 q3 n8 V- i/ o
- exit(1);
; b! F6 n" |9 p& I* g- { - }) o+ w9 [+ b2 S# o
- / j; L* d0 M) y6 P" Z
- // 服务器端一直运行用以持续为客户端提供服务( O+ v2 M& T8 @
- while(1)
0 r. P3 o3 T# r, t" X3 T - {) `& c% |* T* d' g
- // 定义客户端的socket地址结构client_addr,当收到来自客户端的请求后,调用accept
; W( x* j E0 w/ @" F - // 接受此请求,同时将client端的地址和端口等信息写入client_addr中
* ?1 G! E: A; l% T$ m/ \4 G$ Y& p - struct sockaddr_in client_addr;7 Y! X; u1 |$ u( J9 q2 S# N
- socklen_t length = sizeof(client_addr);" \6 T: i% k+ Z$ w, M! n2 [) Y
+ _9 Y2 z7 Y% \) S; ^9 s- // 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
$ r. F/ U" S) E4 a1 E2 t( ^3 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
! |0 Z% P' k* _! N. Y - // 用select()来实现超时检测
6 Y; ]/ r/ L8 n3 U6 [- ` - // 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
1 V Y0 D4 @6 }/ T6 U6 G+ e6 l" Z, k - // 这里的new_server_socket代表了这个通信通道) F3 K1 {, G$ ]7 t! E: ^
- int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);
. D4 c$ P( T2 q0 R - if (new_server_socket < 0)
/ [" d7 G1 w+ ]& [7 P0 c# p9 M - {
{" H4 `% Z9 Y - printf("Server Accept Failed!\n");
# o6 f) ~* o6 }( d* C* [, o - break;6 y( o8 }8 [9 D6 l2 R
- } V, l8 L2 K9 |- ^$ ?0 K
- / x' L4 i! Y3 g9 {/ G* ^2 J- P p5 `
- char buffer[BUFFER_SIZE];
& Y+ j; X0 l P0 N/ ~ - bzero(buffer, sizeof(buffer));
) ~+ a9 t. Q4 c. o: E6 I& V* p - length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);0 {7 W- u% j. J
- if (length < 0)6 D( ]8 `& j/ G4 u
- {3 y+ y1 U" ]% `7 h
- printf("Server Recieve Data Failed!\n");
6 v3 j0 O9 ]. d) z3 Q* O: A- j - break;; P: g3 O* p' y3 u
- }4 @6 S% |& i9 C2 }# Z; m) p4 M3 G
5 z: P4 L& p3 D/ Y8 Q- char file_name[FILE_NAME_MAX_SIZE + 1]; u% y, Y/ R% j' N& @7 w$ T& J
- bzero(file_name, sizeof(file_name));
, ?0 p2 J' U: E! ^; Y - strncpy(file_name, buffer,$ L ^; X( r5 `/ t% U+ S
- strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));7 T+ g6 M1 S+ ]5 h8 \+ K# o- z
- & O+ j; f$ O0 B5 z
- FILE *fp = fopen(file_name, "r");
2 b9 U) z1 E. r. p6 t - if (fp == NULL)
$ ~9 `( J/ `5 Y/ `$ F - {
9 d( [1 w7 Y& j - printf("File:\t%s Not Found!\n", file_name);) B3 v4 Z) B8 Y* V. m6 V0 I
- }+ O4 w0 k' s! x0 L1 `; B2 @ l! U
- else
6 O; l, U+ z+ L: G: C: j2 j" m1 } - {# E( z. x, f0 M9 {- ?
- bzero(buffer, BUFFER_SIZE);( i; ?+ |5 [2 ?- f
- int file_block_length = 0;& m6 M+ f, w) K, G( I
- while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
% z" S8 b0 y* V& }0 u4 R3 ^& }# ] - {
1 Y5 h, b; O- D/ @, N3 [ - printf("file_block_length = %d\n", file_block_length); X( w1 P2 B. L! W3 b/ {3 ]0 `9 p
- # w0 ]1 E4 I6 Y4 M
- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
: x) q1 m+ E% Z8 w- @' P' Y6 I - if (send(new_server_socket, buffer, file_block_length, 0) < 0)
4 c1 a6 L: r- W8 _$ B1 X - {
3 m/ t8 `, d' T% F- o" t p - printf("Send File:\t%s Failed!\n", file_name);9 ^/ ^! R7 H* v
- break;; `( P' n+ `0 Z
- }
9 V) h9 X' \; K* t+ M% W5 t* U
( G' q8 f2 [2 [3 R/ L6 R- bzero(buffer, sizeof(buffer));. ?, i" [" |3 f: B" T
- }
+ ~9 D3 _; }; |' c* _ - fclose(fp);' Z4 u8 }* @' J- V
- printf("File:\t%s Transfer Finished!\n", file_name);
1 o7 i, A0 D! }/ A* N- L& f - }
/ d$ R" W T& m9 r2 A# u1 ]8 v
# D1 X- |( S4 n8 l/ M4 d7 f- close(new_server_socket);
9 r2 R. V$ ^( S# ~1 I4 M! h4 _ - }
7 y' M2 d- V, e! z1 V# a
. O" w/ Z) [* ?- close(server_socket);
7 \6 r3 |( b8 r9 Q2 H( b
U5 Z. g" J" L- V- return 0;
3 L( G0 r+ F& m) ]$ s - }8 e. C- b( A- q8 }" Z% \
- : o( }$ L1 c c/ H3 D
复制代码 0 s9 ?( X" |/ z6 e( r
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