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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.& G/ }1 j% H- ~, [# N7 x
- /*client.c*/$ t: C2 n: E/ I6 Y8 W* \$ c
- #include<netinet/in.h> // for sockaddr_in 1 r( w# _! s* h) I0 J* [
- #include<sys/types.h> // for socket
2 c6 V2 ^+ f3 {" ~ - #include<sys/socket.h> // for socket
" J) T# b# M! U+ J) }# i - #include<stdio.h> // for printf
. d7 |. z3 k" q& A3 J& ?; \5 B+ l - #include<stdlib.h> // for exit
N+ V6 d2 }2 O - #include<string.h> // for bzero * t9 l8 F. d& k: X V+ f; m
- % a' u* U3 ]4 f6 _( d. [1 f! z% i- C
- #define HELLO_WORLD_SERVER_PORT 6666
: U* t3 b) M1 j ^' s, b7 @ - #define BUFFER_SIZE 1024 9 [! t9 I- e( j$ q. a& f8 E" n
- #define FILE_NAME_MAX_SIZE 512
$ I9 T" C' |: _5 B# W, s- `$ h
. E0 m8 E5 B! \. _1 ]- int main(int argc, char **argv)
1 }" p4 x8 O4 k( \) j - {
8 N8 X, `, w& W - if (argc != 2) 6 Q; p! n# V8 v4 R2 m, @ r
- { * Q: `6 ?/ |* E4 B. i
- printf("Usage: ./%s ServerIPAddress\n", argv[0]);
; T- c( f7 e+ `: ]' s - exit(1);
- P4 K- ^$ b0 t: @! ~ - }
T, p' F: h& ~+ L' C - 5 p6 M4 W p3 |: b/ \
- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
7 G; y- V. `% x& G - struct sockaddr_in client_addr;
* B" Y) V n/ G( \( z - bzero(&client_addr, sizeof(client_addr));
( s/ c: t. }# x# O& P$ |: v - client_addr.sin_family = AF_INET; // internet协议族 4 p% s& K: c& v4 g
- client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址
+ L, \4 }: \ X- d+ u - client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口 1 o3 m. b2 q9 q8 z3 w9 w
) I) w* C, O$ c' t- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
7 c$ c5 x5 `# \0 w - int client_socket = socket(AF_INET, SOCK_STREAM, 0);
; \7 H/ M7 A" L+ w& W) S - if (client_socket < 0)
; u3 H' G8 K8 l) a& J - {
) M6 s; v) \; Z3 x - printf("Create Socket Failed!\n");
3 G Y% }% |/ ? ^- Y. I+ y - exit(1);
, ?) a1 ~* }5 j% { - }
7 R. c6 ]( o# B# X4 N- c% j
- E& r8 H/ o }- // 把客户端的socket和客户端的socket地址结构绑定
9 K& L, A! S& ?) x7 f" L% g* w! ~ - if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))
( p. {) B# E, f: Y! k* q - { 6 B( G! B" b& H3 c
- printf("Client Bind Port Failed!\n"); + ?* I% H+ F% |% y% X
- exit(1); ( x3 b! L/ i# Y5 R0 e- A7 H1 P1 v
- }
: C+ H; C; w- C- V4 V - $ v3 v% d9 V0 R$ N
- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口
0 N3 @0 c& C5 x' w/ e5 P - struct sockaddr_in server_addr;
) [, Y$ ^& I+ c - bzero(&server_addr, sizeof(server_addr)); ) Y' P, o4 U! g5 [& y4 o
- server_addr.sin_family = AF_INET; " A) }9 B* e( B- Q8 C, ]
* A4 }( L* V7 U# I- // 服务器的IP地址来自程序的参数 $ U, t3 M W1 Y U) Z8 B
- if (inet_aton(argv[1], &server_addr.sin_addr) == 0) & p5 x# Q$ Y1 B, A
- { " M4 y8 s! W) o' G% i
- printf("Server IP Address Error!\n"); " `; w5 P9 |, @: F$ O+ N
- exit(1);
% C7 e6 ]" s% H; h - } $ f K9 p; {; p
, }. O- R5 _) d [1 c+ W- J- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); : O* P: Q: O4 d) H
- socklen_t server_addr_length = sizeof(server_addr);
" k( v% t7 e$ f u! o - 2 }7 K4 b* U0 B8 ~3 {
- // 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 6 ?! h& x! d+ @+ T# d- z# J
- if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0) 2 S7 v" |7 ]6 ] \
- {
6 r9 a& i3 p5 {4 p, T - printf("Can Not Connect To %s!\n", argv[1]);
7 Y6 F5 h$ Y) e5 |1 Q( u - exit(1);
& [; t: I( H; ^, E - }
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1 W& x! X- K# u( I- U8 A' G0 S) n- char file_name[FILE_NAME_MAX_SIZE + 1];
/ q; N4 Q5 }% T - bzero(file_name, sizeof(file_name));
/ o3 a& d7 q- |( P/ Q - printf("Please Input File Name On Server.\t"); ! f5 X3 m6 h# R4 r1 w% a1 C
- scanf("%s", file_name); 7 E- a; z- U9 C- _! K
9 g' S5 b P' K. w: E# h& K- char buffer[BUFFER_SIZE]; 8 s3 H3 [# `0 {, M# ?
- bzero(buffer, sizeof(buffer));
t; c9 B4 e9 f6 P0 x - strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name)); * T" s. w. ~: |9 S7 g+ y; [: x
- // 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 4 |3 J6 P& m" }4 {
- send(client_socket, buffer, BUFFER_SIZE, 0);
* V; r. J; o) F9 w0 O) F( u, f
2 p6 E" K4 x/ h; [, v- FILE *fp = fopen(file_name, "w"); 6 ^% _! U0 ^3 ` }1 ]: _7 I2 o$ @! w2 T
- if (fp == NULL) , B% O+ n# G' C m1 @
- {
. o+ }( K/ S* w: | - printf("File:\t%s Can Not Open To Write!\n", file_name);
4 a" G3 B7 Z7 H3 Z1 k: b - exit(1); % M: a3 i; B6 F% `1 _4 w; P$ e
- }
p6 c0 k3 G2 H i# k - / r0 ]( g+ Y/ T% D- I4 G8 k" o4 C; V
- // 从服务器端接收数据到buffer中 ' r0 C% \( T1 X3 K0 @7 N
- bzero(buffer, sizeof(buffer)); " O, r) j* F8 I [
- int length = 0;
! h/ b p9 h- }5 G4 L9 S - while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))
" w B( o; V' |3 \2 T5 J - {
7 L$ h! K; A2 C, Q$ _6 I - if (length < 0) 6 i9 D+ T( U( p- J A+ ?4 ?0 o" A
- {
8 k2 T$ s0 Z. f1 r3 p% x- E - printf("Recieve Data From Server %s Failed!\n", argv[1]); 0 m+ w. X& H0 n5 ?
- break; 9 X1 Y0 i& V7 U7 A$ G) h2 l% C, m
- }
; f- l" b2 y6 v# B
6 ]7 P. ?( l9 J* K% {3 |- int write_length = fwrite(buffer, sizeof(char), length, fp); : X1 B, [$ K9 |
- if (write_length < length)
5 L" s1 G* ^, M/ q+ a( a2 b9 { - {
" U! i* F; K- N: l" w - printf("File:\t%s Write Failed!\n", file_name);
# h8 K; D# {. q) v7 Q - break;
9 b. d7 N& ?% ]. y" S - } 0 z* o. h3 E, x% ~6 {
- bzero(buffer, BUFFER_SIZE); ) ?& k) Z4 {- |+ g' d) i
- } & O9 V) y9 @4 C
( D$ q7 }' c. |/ s- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]); ^2 U' q$ ^7 P. G8 c, |
- % o; Z* N( T& h6 q$ m; c0 [
- // 传输完毕,关闭socket 1 d( ~) Z+ y# e
- fclose(fp);
1 q$ ~; @0 a1 I+ U, ]& s0 c+ L% ] - close(client_socket);
( [4 V0 I. P& x# |* g U - return 0;
2 v4 @; w" k# m8 d) S - y- E S/ q& ]* g8 q3 L% @
- }
5 ]1 x# L1 [ {5 r6 n" j
2 n" G I2 G6 [7 p
复制代码- /*server.c*/6 o) y. Q5 b' w& H) J$ z) v9 n. ]
- #include<netinet/in.h>
. K: }8 T; Q: j2 `% _% v1 G' A' v - #include<sys/types.h>6 |9 x9 F7 d3 S9 d8 x; d$ j$ z
- #include<sys/socket.h>
& L7 d5 k' n3 v! F0 B$ T - #include<stdio.h>
* Z1 d2 [8 y1 o7 ]/ r" x# V - #include<stdlib.h>. ?( q; p6 Z0 C8 t% p
- #include<string.h>- ~/ H1 V1 P) Z e) r _
, z9 Z7 r- ]" g+ F' h! {1 @1 d. K- #define HELLO_WORLD_SERVER_PORT 6666 //端口号
/ y# ^5 m/ n6 V, ]8 q. x - #define LENGTH_OF_LISTEN_QUEUE 20& _( [ V$ H. s
- #define BUFFER_SIZE 1024( G1 o. U/ G2 C# J5 v( e# A
- #define FILE_NAME_MAX_SIZE 5126 M+ y7 O: x. e9 Y$ L" G7 H" A
3 v6 ^9 t2 Q& U! s- int main(int argc, char **argv)
3 Y2 d1 M( T6 O0 q- W - {
4 h& E( ^8 u+ D( n0 b( u% ` - // set socket's address information
$ l: z5 K. S8 U, G5 B% } - // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口: |+ x( w- ?$ z! o) t1 K5 h( X
- struct sockaddr_in server_addr;
4 L# k! c; _8 o ^9 Y8 O - bzero(&server_addr, sizeof(server_addr)); ]* A$ [% S/ Q9 P3 t6 T" ^7 q
- server_addr.sin_family = AF_INET;
/ U/ i4 d* R$ j. ^/ f: Q! I - server_addr.sin_addr.s_addr = htons(INADDR_ANY);
& @: x: ~* L* i# ~6 ]7 m y3 Y1 r7 g - server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
# F0 P2 g- Q2 E- M, ~
9 P$ q" Z! Y/ r+ t9 @' F9 b- // create a stream socket1 D+ {3 C) m( X. \" L
- // 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 x6 Q0 b4 g2 m1 K
- int server_socket = socket(PF_INET, SOCK_STREAM, 0);- Y$ u8 l, q9 w$ v+ W3 F
- if (server_socket < 0)
$ n5 [8 ~$ p0 h( i" W" x - {0 R) N3 c- ^8 i9 P7 I+ a' y
- printf("Create Socket Failed!\n");9 E) {7 F% o# L
- exit(1);
, B) c# M1 T* U0 \" N0 [* C - }8 o6 b8 Y6 K3 {6 P* n. D- d
9 R' N& g5 v$ A: W& M* W3 P- // 把socket和socket地址结构绑定
" d+ F. Q- I# D1 O, @ - if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))9 P3 j6 ^9 c) J% K b; Y* I
- {
; x' N" P; `/ i$ ~3 o) A1 p - printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);( q( G* A# K7 O: R$ r, ~6 {
- exit(1);
/ }% a0 k' y# U0 C) c$ m - }
' o8 `( Z0 L2 I5 M3 c3 \5 {- }
- l$ k9 B/ U( o& J4 V7 v- // server_socket用于监听
- j; Z& C% K; u6 [ - if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
; Y( Y# R ]: \' ~ - {
" G! L& [! O1 _4 u* ~* j - printf("Server Listen Failed!\n");
" \8 w- B8 C8 w8 Z - exit(1);# [3 ^4 o" {( y7 S5 j
- }
7 a! i8 d; q$ u8 W4 u( l - 7 E y- M. e) c7 Z! o$ n7 \- c9 |
- // 服务器端一直运行用以持续为客户端提供服务1 \) O7 t1 X0 T4 I5 i7 h5 E( w
- while(1)
, p$ E7 o+ G: n# ]& z* R - {0 x/ s6 Z( p! b/ q+ ^
- // 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
+ o) s$ k! O4 R, U2 m7 q - // 接受此请求,同时将client端的地址和端口等信息写入client_addr中
8 o/ j0 q0 Z$ q - struct sockaddr_in client_addr;
9 o5 T% J/ }$ }4 l d' v4 g - socklen_t length = sizeof(client_addr);
0 i2 [( y% U5 D0 I - ; G0 b) R! ^( p" g f( ~
- // 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
) i7 |& V" A3 t( T! N; w - // 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: ], M/ C$ f0 y
- // 用select()来实现超时检测
1 j: P) _ p- f" |- R - // 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0 F/ Z) y; [4 C6 R# u. a. x" [
- // 这里的new_server_socket代表了这个通信通道% ]+ w3 ?. q% H% z, O
- int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);
A R/ W, N3 R - if (new_server_socket < 0)
* U |! g, Q' F2 e: Q$ Y7 R8 y - {
3 v# k# m7 n V6 G - printf("Server Accept Failed!\n");
k8 d/ V7 K: H - break;: a0 `8 X( p" \! H$ o( X4 u
- }( M- e$ C% k! I+ D; ~; o- W
- * h3 S5 ^& A3 ~" K: }9 g
- char buffer[BUFFER_SIZE];
8 z9 O3 b$ T5 I& I - bzero(buffer, sizeof(buffer));
2 {3 ?& ~0 ?, i# w8 s: { - length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);5 r% m3 { b& T& _
- if (length < 0)
) |. R8 w$ s$ c' k x - {: r+ O, \$ \* q1 l" G& Z3 p
- printf("Server Recieve Data Failed!\n");
6 X N% Z& N# p4 E2 W% }/ c1 A - break;4 b1 J e, L' o1 o3 _% K1 K
- }0 b4 N8 s' b1 W3 f% y+ ]7 g
- 3 b& G! z$ R4 |, o+ Y3 @ h( S. e
- char file_name[FILE_NAME_MAX_SIZE + 1];
/ L. n4 V4 A* G$ C [ - bzero(file_name, sizeof(file_name));2 T2 }& T0 A5 n
- strncpy(file_name, buffer,1 V2 [5 N+ H. ^- W
- strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));- ?7 A! B! J) H8 e. ^4 {7 L
" H' ?) S. q6 s& \! N- FILE *fp = fopen(file_name, "r");
r4 m& [/ P8 |5 c. q9 @# t p - if (fp == NULL)
* d9 p6 o3 c: A: d - {) p5 G1 g0 o/ E& F' Y$ h2 a
- printf("File:\t%s Not Found!\n", file_name);# ~( Y: k2 ?2 }
- }
5 Z6 \- ~6 s: n - else
, I& Z* [/ c4 h+ |3 Q+ t - {
9 [/ j8 p6 P& N$ O3 ?# c! M8 l$ @ - bzero(buffer, BUFFER_SIZE);. q' M# v8 O) k9 I1 J1 Y, F- u
- int file_block_length = 0;/ Z0 y. }3 Z3 o' j1 M! j
- while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
/ J9 n5 p$ T* M. I0 u2 t9 \; b - {( w" O0 k. L, n# v' m! A: x4 c! @3 j) z2 R
- printf("file_block_length = %d\n", file_block_length);
# p+ S4 s6 R) J8 Q
e4 H5 e7 N! N; |; H: |1 A. m; l- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
' ?2 ~# m( |' z7 m7 G8 H1 Y2 A - if (send(new_server_socket, buffer, file_block_length, 0) < 0)) C, b- I* y; ]
- {
! T0 `& D& q# Z, A) y - printf("Send File:\t%s Failed!\n", file_name);, s% S4 u0 _3 e' D8 m0 @! u& h
- break;
/ x; v4 C5 T3 x( J" P; V - }
4 Y- H. v9 T7 p# p# Y( n
' a& I2 L' i# [6 N" O/ C- _- bzero(buffer, sizeof(buffer));
# g& E: K& {, u' S - }0 |8 j$ o* v1 |3 r
- fclose(fp);4 [) _, _4 Y# q9 t, _
- printf("File:\t%s Transfer Finished!\n", file_name);
, i; i3 F- ?- L3 `- Z9 p! X! G( j - }7 ]$ b) J. ~4 |, G
& k6 D! W6 _2 P( h& \. ]1 T- close(new_server_socket);
8 i( E; _& x* M& b; M& T0 ` - }$ c( h% Q4 I% v1 k N
- $ G7 h; _$ i" h& A# G
- close(server_socket);
: G; L3 Q% J9 T# x5 K
' X. }1 e4 b4 G3 t0 A' h7 `- u3 k3 L- return 0;8 N; Z# o- f* |; c
- }! t3 F' I7 @0 e
- 5 P% B( h2 K! o
复制代码
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