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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.! j6 ~3 i* H# B6 B0 n
- /*client.c*/
+ w- q, x" _8 M3 b4 {$ ~; }9 ? - #include<netinet/in.h> // for sockaddr_in
! D7 t. F+ E' T" ?. Y" [ - #include<sys/types.h> // for socket - m0 `- a; O8 g6 g. W3 D
- #include<sys/socket.h> // for socket # `; L. B& { w& U0 B; P/ l
- #include<stdio.h> // for printf ) ^- b# D" X+ A' q, Q
- #include<stdlib.h> // for exit 6 E7 Z: M ^* E8 p
- #include<string.h> // for bzero " Z/ e8 P8 O3 a3 S Y3 {
4 S2 V2 Y" O4 p2 l- #define HELLO_WORLD_SERVER_PORT 6666
7 M- I9 _! F3 {# v! c0 T1 t& Q# m2 ^6 { - #define BUFFER_SIZE 1024 . w% s* l. j. A' W: Y9 k
- #define FILE_NAME_MAX_SIZE 512
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- int main(int argc, char **argv) / R/ T! o% Y% i8 ^
- { 5 e: W& r1 \0 c0 T% a+ J
- if (argc != 2)
: C% |3 l! K8 r7 D) I - {
9 C* ] i2 Z/ e# N" T D3 w - printf("Usage: ./%s ServerIPAddress\n", argv[0]); 6 k% X0 ]! X$ e# }* V
- exit(1);
) ?1 s0 J. ^) Z# E3 l - } 8 Z# p% @5 J# U: c
- " _0 d8 _3 a: Y
- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口 , O! ^. R4 t" A( {- {) A7 j
- struct sockaddr_in client_addr; ; u" d. P- n6 o; ~5 T, ]# E& T
- bzero(&client_addr, sizeof(client_addr)); 7 f0 X4 ]' ^) \- H; i/ Q
- client_addr.sin_family = AF_INET; // internet协议族
% H: r) R- S0 J/ v: z - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址
$ T9 j9 r- L+ Z - client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口 " b- X5 R ^& `( f- R/ P9 ~$ U
1 J7 E3 O% V/ |' v' g- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket 4 H7 r& c( M4 x P) h4 V/ j4 ?# H& l
- int client_socket = socket(AF_INET, SOCK_STREAM, 0);
* j5 n3 r! o( L: i - if (client_socket < 0) , O% a, x6 P; L. ]* }) l% T
- { $ l _7 ?9 ^: Q! W
- printf("Create Socket Failed!\n");
; u S% }" r9 }# c( d3 s. S - exit(1);
* W4 G4 B$ ?7 n9 u( w* c( x0 V6 i - }
3 U$ d! v# ~7 j8 ]
5 A/ _# m {- N8 d- // 把客户端的socket和客户端的socket地址结构绑定 / f6 b% e8 n( w5 g7 X
- if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))
' Q9 T% w+ O& r7 m - {
* Z* c6 I; q1 t - printf("Client Bind Port Failed!\n");
# ]- l% M- n' G0 H/ f! F9 [6 x - exit(1);
" d B7 }9 u$ g( l* T5 }% B - }
v2 ~6 r5 @9 L5 w% U - " d; q! H8 y1 J8 [
- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口
4 l T4 }" @* U/ `, Q - struct sockaddr_in server_addr; ( T3 e( \5 i0 U& ^
- bzero(&server_addr, sizeof(server_addr)); 2 d! g- m; C" s9 r! q6 v" @
- server_addr.sin_family = AF_INET;
; @4 [+ c) r. W& f - ) P/ B" q) Y$ ~4 i# w5 z; P9 D- x/ ]
- // 服务器的IP地址来自程序的参数
! o) k6 g5 z# i" U - if (inet_aton(argv[1], &server_addr.sin_addr) == 0) $ H0 b! M' O# ~: ?0 d6 N& e0 L( {% U: q
- { ) I/ I3 p: D$ I. ^+ a! r2 y. f
- printf("Server IP Address Error!\n");
& m! U n( g- n/ e - exit(1); 5 n, E+ N0 `0 Z3 D* M! x
- } * P* P7 ~- }" w
- 4 b+ j0 |! C( l+ _" Y2 O3 f
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
; z# ~3 e; _- y0 p - socklen_t server_addr_length = sizeof(server_addr); # P0 Z; G0 l6 }# T; Y( V
- Y3 P i, h; n3 @6 D( o" X7 Z
- // 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 \. l, N1 B( i# K0 | - if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
4 a$ m( \, f( ]' q5 l - {
1 a' H2 x2 g- j, r$ Y5 D% M+ s c' D - printf("Can Not Connect To %s!\n", argv[1]); ; p/ I! d# n( o+ w$ J8 L6 K2 C6 N
- exit(1); + L% ^ F/ L4 x, T* n( U4 ?- O
- }
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' I& ]1 _0 t2 t. l% ?; N- char file_name[FILE_NAME_MAX_SIZE + 1];
2 \' A7 u- y9 u4 u6 z; y - bzero(file_name, sizeof(file_name)); ( U' C d; m& h7 w! @+ d$ i; K
- printf("Please Input File Name On Server.\t"); / J/ q% m% ?/ i# X9 C7 X/ h6 B
- scanf("%s", file_name); ! k+ I& v: ?' c& u; D% x$ c( C- }8 B
" Y$ T, Z d: \; f- char buffer[BUFFER_SIZE]; , X, H8 d5 e# q. h7 \! }/ O
- bzero(buffer, sizeof(buffer)); 9 c \$ ~* X; N( `2 z3 f9 }
- strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));
! S0 R' D4 V6 C+ o - // 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 y7 W. H$ Y+ I6 i
- send(client_socket, buffer, BUFFER_SIZE, 0); ; }0 e1 ` t2 M$ T r' p4 I
- 4 k9 N0 @0 c6 b/ B
- FILE *fp = fopen(file_name, "w"); - W7 q8 \! i2 V- ^
- if (fp == NULL)
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- printf("File:\t%s Can Not Open To Write!\n", file_name); 1 e8 w# }* s/ S; w$ t
- exit(1);
9 z( g4 i c+ y- Z - }
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- // 从服务器端接收数据到buffer中 - @/ K4 q* z3 h% S
- bzero(buffer, sizeof(buffer)); ; K+ K( R1 j4 ?$ i: V7 f j; S. A
- int length = 0; ' G$ j: L# z2 \* p1 v+ g n
- while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))
6 _9 B) W: u$ X7 [& Q+ W4 l' s3 ] - { ' W: `( k: u. }* r% A2 p9 m. p/ _
- if (length < 0) ) ^8 r2 |; L, N
- {
7 Y& ~1 J* u, T. ]8 d$ H* b" ]& l - printf("Recieve Data From Server %s Failed!\n", argv[1]);
0 v( k5 m, T* d - break; 3 w6 F1 r/ X) b A; a
- }
% ^- k; X B* ]4 v - + w+ ~4 T' `! m; N' x: w% r: X
- int write_length = fwrite(buffer, sizeof(char), length, fp); 2 j' K5 {7 q7 j6 Y+ k9 \4 R8 v
- if (write_length < length) M, F9 F8 L @7 \3 a1 k- ?
- {
6 E/ v, O& G, e! J3 t) x1 q - printf("File:\t%s Write Failed!\n", file_name);
5 t6 L5 T( e1 X% h, D/ l) A# G! a - break; $ t2 C5 M. U1 D$ | ]% v; I6 c
- }
% a# L7 X$ y1 m( I. k& Y9 M - bzero(buffer, BUFFER_SIZE);
& l. \9 Q4 j9 R( q# C4 R/ m1 i - } 1 ]9 \5 E, I. u7 @
- - e+ N. b* {; w5 ?$ D
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]); 1 R- |; a* j% B- x4 \6 }) ^" O& V
- 8 ?- j' a3 G3 W
- // 传输完毕,关闭socket
: I8 ^% l' Y! ]. Z - fclose(fp); % ~- W: f1 k; d( S5 Q7 E
- close(client_socket); ' M6 S2 R. e5 |/ W# i
- return 0;
* C7 c+ N# Y& y h% ? - ( U. a4 ^" W/ H V/ v
- } . `8 w1 e" V$ x6 a5 h/ ~
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复制代码- /*server.c*/* l6 p/ O8 S( k+ Y o. f' O
- #include<netinet/in.h>/ U$ d& {- l; ^0 ]; M R! w J* _ {
- #include<sys/types.h>6 ^# B3 M7 I# U
- #include<sys/socket.h>4 H; C5 g$ l0 s) E
- #include<stdio.h>
/ P0 p" g4 ]2 f3 a2 S+ T - #include<stdlib.h> B5 h( G* ~/ A7 D( L0 @8 q
- #include<string.h>6 v: r- l( C4 I7 h7 X
7 ]9 ~, j4 ~) L% r( v7 i- #define HELLO_WORLD_SERVER_PORT 6666 //端口号9 W8 `7 N2 }: E8 \" S3 ~/ S1 {
- #define LENGTH_OF_LISTEN_QUEUE 20; X2 u# l" T5 ?) I# W1 D
- #define BUFFER_SIZE 10246 q! I0 x7 e d: V& A2 p9 B
- #define FILE_NAME_MAX_SIZE 512) R$ R4 z* v" _# b. @' k; H0 i
- " y4 e0 m, @1 F
- int main(int argc, char **argv)
6 @9 k* I% G( [ - {( e ~1 [: T- K' y( Z
- // set socket's address information8 C! ], ]7 `7 N# `# |6 @
- // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口# t" i* D) d9 f$ M- o+ J% Y
- struct sockaddr_in server_addr;
: D$ B; A/ Q. C0 u, e: V) T - bzero(&server_addr, sizeof(server_addr));% `7 V% L. b2 p }; b- Q9 b
- server_addr.sin_family = AF_INET;
8 k8 z, m6 u7 J - server_addr.sin_addr.s_addr = htons(INADDR_ANY);) d5 B7 }9 t4 }
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
" |6 g5 v) }% u' j, R9 E; w' @
6 r) ^3 A" p) N- x- // create a stream socket8 ?) {. n _* G% f
- // 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* w+ [" F# J, M; v. {1 I) d/ A
- int server_socket = socket(PF_INET, SOCK_STREAM, 0);
2 W) b% e0 }' j5 P$ |- y - if (server_socket < 0), n' N; D7 r) u1 Z. e2 G
- {+ O0 h8 J+ V. n" _+ e& A7 \& x
- printf("Create Socket Failed!\n");& u4 ~( N% A; J& }" t* D0 h8 o
- exit(1);
( F* F5 U# P# p4 v0 f - }
y0 q8 x$ t8 T2 o+ S! q - & _& K2 I3 P3 Q2 Q
- // 把socket和socket地址结构绑定' x3 v. e# ^: n' q- _+ D# d1 A
- if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
. m+ e6 L! G" g - {! J' ~# X7 K& a6 `0 l& Z
- printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);2 h7 c! g; ?/ H% ?
- exit(1);2 M+ A9 _8 H, F# Y# D4 n/ G
- }% z! U I$ K9 d6 u$ y( ]. W% [
- % \$ o: U% T4 j5 {+ E
- // server_socket用于监听
1 n- ]6 F! {+ K# R* z" X - if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))# j* |& G2 o! O- h: t- q8 o7 l8 Z
- {
+ Q# k/ X, o0 i3 j# Z$ e0 j' N* w- h - printf("Server Listen Failed!\n");
( C% Y" x9 D. M A' E" } - exit(1);0 t1 R# }9 W9 i7 E! `6 H
- }
" W8 r8 e( U7 d. C! {
$ I7 |9 ^6 v% Q% E' j7 X- // 服务器端一直运行用以持续为客户端提供服务
) E* b1 u* L9 @& _2 v5 v) n$ G6 I - while(1)* Y, i9 Z# r I
- {3 P# K; F F" a9 K. `- _7 k" W
- // 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
: Z2 B$ W/ u( d/ r. i - // 接受此请求,同时将client端的地址和端口等信息写入client_addr中3 B# B' }9 g1 Y- w* j5 `9 s5 E: U
- struct sockaddr_in client_addr;6 ~' d5 b. } |. o& O" W( F8 I
- socklen_t length = sizeof(client_addr);
6 _0 u* M* m4 t6 ~0 |0 w - $ V0 h4 M5 N, H2 g
- // 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/ Y% N- V3 V9 c1 `/ I' j( G
- // 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
; U9 x/ E5 }+ C( f5 n# _; m - // 用select()来实现超时检测! S( S6 r5 E" t7 f5 n- p4 |, h3 Q- L
- // 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
2 y7 n5 B6 l# E( I8 a6 j0 n - // 这里的new_server_socket代表了这个通信通道
# d1 G/ j# l( k: O# p - int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);
* O' ^# G) N$ Y- Q5 R - if (new_server_socket < 0)
# V# i1 e7 ]$ g1 g+ K+ h6 N! W - {8 K7 O/ k2 Q K$ j, O/ t' O
- printf("Server Accept Failed!\n");+ Y" U' F3 t# B- t& R1 e- b
- break;
k3 x, @' b8 V7 h) t) o) R - }# q0 B3 A! o/ t% {3 I7 Q3 T
- $ K; c( `: f5 Y# H/ f
- char buffer[BUFFER_SIZE];
% u# i* _0 e: q3 |9 A5 d - bzero(buffer, sizeof(buffer));1 s6 a( ?/ ?7 u5 p
- length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);
1 ]$ ]. p0 I$ ^( [( ] - if (length < 0)
/ v% z0 O! u8 f9 ?$ l1 k - {
3 J. N# Z6 `+ z' n: r: | - printf("Server Recieve Data Failed!\n");
0 k9 j f. c6 K k- z* b - break;6 k B; v5 Z" _0 @" q2 y
- }' V1 J8 S; y( q4 E6 ^1 b
2 | I; [7 |( o& I- char file_name[FILE_NAME_MAX_SIZE + 1];4 u( T; X' a* i* j: F
- bzero(file_name, sizeof(file_name));0 g) K4 s; [4 A I3 {7 C& }; L5 R
- strncpy(file_name, buffer,$ S5 H. k+ f1 |3 n" s
- strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));
9 O" w* J5 g( b6 G2 m4 y - - `6 Q. n# d: e- u8 j: m) B
- FILE *fp = fopen(file_name, "r");5 v% j! s" ?1 y" U
- if (fp == NULL)
$ ]! B8 }/ |$ m9 Z! V& y - {
6 G( ~$ ^: ]& P1 Y* Z. Q, ^8 Z - printf("File:\t%s Not Found!\n", file_name);
( L: `. i; } O* @3 o4 M - }
- x& U \. t- Q( R r( u+ X; J - else, q) j4 N! p) o( D) L! }2 ?
- { m, o* M& h: P* x3 H: h
- bzero(buffer, BUFFER_SIZE);, O: L( \4 i) `7 T
- int file_block_length = 0;
$ I8 R2 q" F' s; n4 E1 {, B* }# f - while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
: f) F2 ]0 g' `! M. [ - { a2 ~1 j. ^; {) ], I
- printf("file_block_length = %d\n", file_block_length);9 V# D# l; h# F) T6 z
- 6 j+ k8 V3 J" R) r/ M
- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端3 c& i) N+ n. \3 S; l) ~9 O
- if (send(new_server_socket, buffer, file_block_length, 0) < 0)
( G* Y/ c. Q7 A5 X l - { b. n. `5 B$ L% i
- printf("Send File:\t%s Failed!\n", file_name);
! B x9 M$ @3 I, {" v" S4 _ - break;. A. C) N; R! H4 D2 p
- }
0 A* o- C& r! C9 ]2 z
, B4 @, `; `0 E) q" j& `- bzero(buffer, sizeof(buffer));
6 P1 E" U ]2 k2 c6 h" w - }1 C! L8 Q D3 `5 d9 z! b$ K
- fclose(fp);
$ m& X* l3 I% \ B( P - printf("File:\t%s Transfer Finished!\n", file_name);
. f5 c+ g/ w% ]. F) T' J - }
& |) m( u% @- U6 I- z' y - 9 T* k! K5 b" W1 x/ B/ U
- close(new_server_socket);
' N( w- `! z- _; W& q - }
7 i {2 k0 n+ \2 {/ j7 b6 ? - 6 D7 g( _; Y3 \0 n
- close(server_socket);
; _. H0 ?, ?( E2 f& M+ } - $ ]6 J( o4 P6 o/ l0 v7 Z8 q
- return 0;
" t3 n, Q G6 }4 N$ B/ a - }1 N# ?$ K5 `& ~% ^# ~. T* L. q
- % O. K/ ~3 i) @* b. @( m
复制代码
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