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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.2 D( q9 t1 p t* ?* y
- /*client.c*/
& I% V% j4 }. j8 s! `( d# Z' y - #include<netinet/in.h> // for sockaddr_in
/ d8 U7 g/ o* n F- S2 n - #include<sys/types.h> // for socket 6 v. _$ o$ d; R w4 A0 ]
- #include<sys/socket.h> // for socket
) O- J$ _4 ^- `7 F/ ^7 l - #include<stdio.h> // for printf @9 Z$ O- h4 ]! a; V1 w
- #include<stdlib.h> // for exit
6 o1 u) j3 M! Q+ n' `+ G$ x - #include<string.h> // for bzero
+ W: F2 z* \9 s - # H3 v& d. [+ a& b2 l4 c3 E. m
- #define HELLO_WORLD_SERVER_PORT 6666 ( X \9 y. E2 ?" i) E- E
- #define BUFFER_SIZE 1024
& O9 R: u- @. v& v+ `* r - #define FILE_NAME_MAX_SIZE 512
; U. v+ i' W, t
6 C* Z: O3 a- H9 c' a e8 S2 X- int main(int argc, char **argv) ; y' T; w/ \0 {% O
- { 1 H1 I8 A% H! k s% _ t8 _- u2 q* J
- if (argc != 2)
& s8 [, L' w5 H2 t% v. P - {
7 e2 ~3 i" M0 T: U - printf("Usage: ./%s ServerIPAddress\n", argv[0]); }; I/ R1 y5 F {! c4 H4 L0 @
- exit(1); + d9 n2 A f; y$ }& c. ~1 z
- }
* l4 V% U/ y$ x- T7 F8 @' h( |% I - * m4 x* b) u( }9 e5 r' t( x) X7 d& O5 S
- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口 , F6 m& q* n7 ^) z$ i- |+ r( s$ @5 p
- struct sockaddr_in client_addr; 7 d; ^2 R6 M! i$ \5 ^5 i+ I% m
- bzero(&client_addr, sizeof(client_addr)); 0 T) u0 C4 J' h5 i9 z# b# t. b' Z
- client_addr.sin_family = AF_INET; // internet协议族
: P/ }$ b# J- _) F6 B" C - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址 + f5 Z% z: |/ L( P& Z
- client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口
+ _% Y! M3 F- A6 u
' C! J# U0 z6 L& y% }" C, G. S- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
8 ^8 h; B$ x5 j7 t! d4 f* U - int client_socket = socket(AF_INET, SOCK_STREAM, 0); ) N) @, I# H& P3 W& g9 b0 R
- if (client_socket < 0)
- x# R Y, i: M M- ^$ i. B% b5 ? - { ' X, Q4 N- ?/ {( S+ H: n; e8 R
- printf("Create Socket Failed!\n"); 7 d& v" ^7 y# }8 x0 R- D( Z3 r, A
- exit(1);
) e# i. z# I0 {7 n8 } - } / X1 ?$ @% V1 i9 X7 S
- 0 V* J9 x- S1 z2 m5 j
- // 把客户端的socket和客户端的socket地址结构绑定
- _" g! n; L" t# o - if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr))) ( N K4 b& f7 H0 p. `7 ?3 R+ e
- {
2 i) H+ P& H( ?& q! J+ I( j# ]+ @ - printf("Client Bind Port Failed!\n");
9 K7 \" m+ {6 a ^ - exit(1);
( R" g8 `% W2 s( ?" n0 S1 Q - } 2 K4 h, a/ c, R% r: b$ k* S; l, C
- . j+ q* w4 h# J0 H; ^5 w6 ]
- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口
. ]8 p! ^' V! B9 h# N5 E& |* R - struct sockaddr_in server_addr;
5 s0 z+ a( x$ V' o - bzero(&server_addr, sizeof(server_addr));
0 o' E+ s, F& p" g$ l+ d: h% @% m - server_addr.sin_family = AF_INET; / k2 t6 m. t# c' S, ^3 O
- + H6 U1 ?4 _$ m
- // 服务器的IP地址来自程序的参数
# C& i5 ^) K% \0 c: N1 o9 f- B6 m - if (inet_aton(argv[1], &server_addr.sin_addr) == 0)
) L# W# s! j: n7 J; o" _# E - { ) R$ G# q0 e# N' i
- printf("Server IP Address Error!\n"); ! V9 g$ y9 Q& j8 g) y4 V0 J) U0 p
- exit(1);
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- 0 E7 J+ \( z* B# L$ c* X; m
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); # G* B/ M" i/ w
- socklen_t server_addr_length = sizeof(server_addr); ( t$ D0 V" U0 A8 Z9 ] U5 e. p
+ j( X0 b* 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
- S/ ?7 k# U/ e9 k) r1 D - if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
. c( I( N6 m9 z - { * i5 ]6 d3 c9 D
- printf("Can Not Connect To %s!\n", argv[1]); ! _# L5 o) W; n r/ v( `' a
- exit(1);
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! P2 K& } W n3 Q+ o- ]$ `- char file_name[FILE_NAME_MAX_SIZE + 1];
% {% J* f' J% R - bzero(file_name, sizeof(file_name));
0 y* n0 |/ ^- M1 c - printf("Please Input File Name On Server.\t"); . P* N J! s1 C
- scanf("%s", file_name);
- y; d" O7 P( w, d7 [ - 5 n9 E Z; ?7 P# v
- char buffer[BUFFER_SIZE];
+ G/ e2 g6 `5 d - bzero(buffer, sizeof(buffer)); ; B4 X/ Y, Y2 z# z2 l8 G9 r
- strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));
' N6 O' Z$ e9 G3 L1 u7 ?4 @ - // 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. Q- z$ \; u3 e1 V/ K
- send(client_socket, buffer, BUFFER_SIZE, 0); & R* z5 {8 I/ g/ f1 F- D
+ v. F) A6 o G& t- FILE *fp = fopen(file_name, "w");
% S5 y! n/ A3 L& F5 R, |9 J2 X* A" v - if (fp == NULL) & [- ?" K/ R& r, t4 q! F4 X
- { " t& S2 g/ r# n6 O" m3 \* X
- printf("File:\t%s Can Not Open To Write!\n", file_name); $ t7 Y2 {8 K$ o, r! h% D
- exit(1); ' \: R+ I' u* h+ Y
- } 4 ?; C4 W8 O! o/ F
- , w& g; ~8 U. `4 W& k1 @# B! E0 o7 b
- // 从服务器端接收数据到buffer中 + Y0 x) q$ V0 T+ Z. S' ?" g' }
- bzero(buffer, sizeof(buffer));
. G9 A3 J% [. ]9 @: ]. R - int length = 0;
5 U/ w6 e! |$ y! M9 f+ O+ h - while(length = recv(client_socket, buffer, BUFFER_SIZE, 0)) 8 A% k! q- } s
- {
3 E! U1 F' H8 h: P! N3 C5 g& K$ \ - if (length < 0)
8 Y7 l* K9 X0 e. g4 S - {
7 m; y6 V1 {# F8 Q4 f3 ^ - printf("Recieve Data From Server %s Failed!\n", argv[1]);
, r, R; X' c6 M2 [. v: ?. ` - break;
) x% u* o( [7 _3 O1 u f8 q2 b; ^; U - } 6 J. l, g4 c4 A3 a# H# x4 f2 G: X" o
- % A7 m9 s3 q$ {. q1 X
- int write_length = fwrite(buffer, sizeof(char), length, fp); 6 y7 N' H& w4 `0 q) e
- if (write_length < length) 5 P8 [* U$ Q) ^$ T2 O `4 c. D
- { 0 Q o$ `, F8 F- e& R
- printf("File:\t%s Write Failed!\n", file_name); - Y; p5 f# \* t# ]4 W2 q# p" \
- break;
( u- X( C7 v5 q n, Z9 r - } ' V3 G, S {. Y6 U5 W
- bzero(buffer, BUFFER_SIZE); 7 F( G5 N3 Q9 ?
- } & N" R5 I) n2 W2 X, A% T7 } R
- 3 K9 j {1 k9 b: ~0 x
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]);
, @7 t' o2 g$ i# f9 ^: ]6 y+ K# S0 v; }
) a% |4 l( K/ @7 X1 v$ B- // 传输完毕,关闭socket : C8 W0 i) _ T6 C
- fclose(fp);
+ W* b& A* k0 v- J0 J- h K - close(client_socket);
% G; b1 N9 ]( I, l) b; ] - return 0; ! ]7 p r, y7 g( Z! s
w# A% d+ q( r- } 1 k! c% ^ B1 [1 T7 Z# c
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复制代码- /*server.c*/* A. a5 P' G% D
- #include<netinet/in.h> m2 D& [/ D5 Z: G! V8 O0 e7 l& u
- #include<sys/types.h>
, L: i a& L) z9 |" _2 O" I6 E2 Q - #include<sys/socket.h>
! U( k# Z) Q3 a6 @7 |, E - #include<stdio.h># W5 @( J3 v N: \3 L$ t
- #include<stdlib.h>
& ?7 y8 [2 i/ \/ A& } - #include<string.h>
$ A) }! N8 U6 f' } c$ p# q
. d( j8 E$ d4 b5 L) A' ]; C: G1 l* p- #define HELLO_WORLD_SERVER_PORT 6666 //端口号
# I, i! C/ f$ @. S& a - #define LENGTH_OF_LISTEN_QUEUE 20
& G% R1 ?8 {% f" i3 L2 D9 | D - #define BUFFER_SIZE 1024
3 d% f& l5 K" O: J9 s$ ^# o9 Q - #define FILE_NAME_MAX_SIZE 5123 X% S5 `9 H0 Z9 q7 o/ ]
- 9 u% h; P+ \- v) P: n7 w
- int main(int argc, char **argv)& m) E2 z" K7 b, L
- {# Z$ V# I! f: W
- // set socket's address information8 g! o* l3 }* x
- // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口! Z3 x& R% P9 x6 f
- struct sockaddr_in server_addr;
3 f# S$ e/ O; m! k - bzero(&server_addr, sizeof(server_addr));
* w9 [3 u/ D& z% x# u) u1 ~ - server_addr.sin_family = AF_INET; k& d6 w" d! O( V
- server_addr.sin_addr.s_addr = htons(INADDR_ANY);+ o8 S0 t1 g8 x1 u' u8 L
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
" x- g# {/ i0 m* g - 4 W1 M7 q1 [0 K7 R2 X/ }
- // create a stream socket; ^, V( S1 ?/ q: c
- // 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
% {6 \7 H+ t6 }8 G2 y! ]5 ?; a - int server_socket = socket(PF_INET, SOCK_STREAM, 0);
/ p2 G; B4 x9 J( { - if (server_socket < 0)/ ^8 S7 J1 y5 F$ X k$ E: C
- {
& z4 A: m7 G4 `0 I2 n - printf("Create Socket Failed!\n");* C# S2 t9 i' F' g3 m
- exit(1);
/ j6 L0 C3 y1 P3 t, { - }
) T7 e1 {0 H2 M
: J+ o0 d1 r# A) b- // 把socket和socket地址结构绑定
0 [% ^. G3 @3 P+ p- e - if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
4 W: ^! `) u& ^+ \: [7 k9 A - {
* x1 s1 E6 d& Y, H7 o$ R - printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);2 B9 L% e) T. y
- exit(1);
. `% E# q3 V3 w' Q2 c - }8 }+ Z, S& i1 d
- & G/ V. A5 r! E7 W) p
- // server_socket用于监听4 N( ^# D/ p5 }4 D% b3 r
- if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
+ q M- I5 y4 _) E2 }5 b1 n - {
- ^5 A9 W& n# }1 m) U5 y& P& i( R - printf("Server Listen Failed!\n");
7 f x+ ~/ a7 I" {! T - exit(1);
2 g" Y; r+ I" d8 `( h F/ g - }
3 \# V- p6 `0 \( X. `
- z# n/ W; B; K/ p# d o* s0 x& b7 f- // 服务器端一直运行用以持续为客户端提供服务: h$ L; [0 ]3 v1 r
- while(1)0 J c, e% c. F8 N# y
- {8 \1 }4 Q+ p, `1 W7 b
- // 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' t+ F b' K- y T1 O* F* 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% ^4 K% R; L; U: u6 V7 i' b- r. r* n
- struct sockaddr_in client_addr;' N3 a5 M" X- _( l4 |
- socklen_t length = sizeof(client_addr);
/ ~! J: z6 j, {
; \' A0 ~9 x" d+ T/ t- // 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
* @6 z( S8 j5 c1 J8 a& i3 e" O- z - // 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
6 A6 [4 w; r2 q! g, p - // 用select()来实现超时检测3 R( L2 [4 h* I& w5 q
- // 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. n v0 K* Y2 ^( F5 U) _
- // 这里的new_server_socket代表了这个通信通道
" M1 x% t. m, q( I+ d$ i - int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);
4 w! O7 H' X+ q: v$ E2 ]0 G - if (new_server_socket < 0)/ B* U$ T7 d! V6 v0 h0 F) o
- {
" s" Y/ g9 M3 F2 X - printf("Server Accept Failed!\n");( J% A" ?' c" T" ]& L9 O
- break;
! }- D' O4 k0 o- u8 Y9 y2 p - }
/ r4 |, v2 g4 j8 x! E, p& f! r
& ^ P; o# A+ X5 w& B: ^- char buffer[BUFFER_SIZE];
) \/ U) T2 I3 N" [+ m - bzero(buffer, sizeof(buffer));9 p' O2 D6 y, W- e" |
- length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);
$ w( E( @' P- l9 d, W; I - if (length < 0)7 U# J* q. ~, V2 T
- {
' ?1 |# O h6 j* n7 a! k4 j! j* S% C2 u" \ - printf("Server Recieve Data Failed!\n");
g" V- s- } T/ d; |- z - break; |& X! g2 {9 T8 C, [* b( H& n
- }) O0 N7 O& X4 P' n$ v) C# q1 o
4 ~$ b8 |% c. K; w$ S- char file_name[FILE_NAME_MAX_SIZE + 1];) Q3 E! w' l- g+ L
- bzero(file_name, sizeof(file_name));8 H: r2 s( o# A5 ]+ d f
- strncpy(file_name, buffer,
! i& n: z1 r" e! _* l, L! k - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));
5 ]7 _% J+ }2 o
% a7 Z0 n: V0 k; c$ U4 Q2 X- FILE *fp = fopen(file_name, "r");
% \2 ^9 D2 K. J7 _ E. k - if (fp == NULL)$ B# O* N m3 b3 i% I4 Z \! ?
- {
% x7 d2 c! b1 }1 y' {$ M3 m - printf("File:\t%s Not Found!\n", file_name);
' g1 {/ R7 s+ K3 ], A2 f8 ^: q - }
4 d" }! O$ S; o* q - else# ?+ |" S- P# B
- {
w9 t- L0 n; E - bzero(buffer, BUFFER_SIZE);4 Q4 Z7 C5 Y+ F
- int file_block_length = 0;# W. _' r, F: r# C+ r, H
- while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0); Q; N i0 w. `# D, S* E
- {+ j* b; ?7 z( F6 ~: h( i% f
- printf("file_block_length = %d\n", file_block_length);( Y' v9 u, n' ]3 K, a7 D ~ x
+ r- _4 F% B, Z1 m5 k- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
* a2 e6 C- V! N' E1 ?, D* w - if (send(new_server_socket, buffer, file_block_length, 0) < 0)/ P( k m; Y& e, }# s; p" _- q9 B
- {
4 m: t) L" \9 }& B - printf("Send File:\t%s Failed!\n", file_name);
+ U) N* |% Q" O: Z* H - break;
" H/ I, T' W0 r2 z! Y( C - }; R: n1 H1 m; r! ]* n6 }* D
- ! _& N$ h5 I! }$ ? G
- bzero(buffer, sizeof(buffer));; b3 ]- `. X$ x
- }5 _4 r( p4 g6 ]3 c
- fclose(fp);; T3 @7 U1 F* V+ M/ g& j
- printf("File:\t%s Transfer Finished!\n", file_name);
. o- r4 o5 W: l$ n. U, a3 C, y - }! `+ q. }! L+ s3 U# _9 h/ }) J
6 r/ @! r6 k5 ^6 A9 v1 D" r- close(new_server_socket);+ \. w g( c! u. `
- }
% X3 f/ {" c5 p$ J/ H* Q' S
4 f- F( E7 f2 Z) F4 K; o- close(server_socket);
( N% c6 N! K0 ?3 }( @$ y d# F9 J0 @8 f
' N. R% D h, ]$ R- return 0;
5 t; P8 _" e C" f - }
4 g0 i+ T3 Z4 z) t% K - % Y: ]2 _6 s* i& i: }# }. {8 S, @
复制代码 ; a& h9 Z O5 d( W% z" B4 ]0 L( z
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