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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./ g3 O# e8 ?# p7 f
- /*client.c*/+ B( q( `6 K3 f4 G' H+ t( T
- #include<netinet/in.h> // for sockaddr_in 4 J7 Y; ]0 K# S2 @, j+ C* G. ~8 W: F
- #include<sys/types.h> // for socket
. Q1 y4 H; {# @" c6 h! e, ~; @ - #include<sys/socket.h> // for socket + L- i( s# ?3 C' c2 ~7 k
- #include<stdio.h> // for printf
C1 m% g" s9 p7 ~4 ^2 u/ W - #include<stdlib.h> // for exit
' R" }$ a; p0 D/ h. j - #include<string.h> // for bzero + x! p4 _* H$ ^
! q$ V, Q+ J4 g( _; f) z4 B- #define HELLO_WORLD_SERVER_PORT 6666
4 L3 t. o/ o" T' [, \ - #define BUFFER_SIZE 1024
: b- g m' A& Y% _9 [; B - #define FILE_NAME_MAX_SIZE 512
5 j3 M* D9 L0 d- v+ L* A1 ~# V, n
( |7 L2 _! r+ j- int main(int argc, char **argv) / o5 ^% t0 {" c! R
- {
; B6 C% r, u! F4 x7 z - if (argc != 2) " O# _& N& l2 a8 o6 b
- { , K0 e6 e& n6 C) T2 R* h
- printf("Usage: ./%s ServerIPAddress\n", argv[0]);
/ ^, y# O, K0 b/ v( b. a - exit(1); 4 A3 b8 R0 ?, P) I" l0 K
- }
& P: }7 c/ h, }' f) R - / n5 x3 m/ ~6 l. j; G
- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
' r$ Q, {& d. {5 a - struct sockaddr_in client_addr; ) W# V0 F j' b' G% H8 q
- bzero(&client_addr, sizeof(client_addr));
- A* S4 X8 \% y# w: t - client_addr.sin_family = AF_INET; // internet协议族
5 d( k. @8 f+ o a+ c; Z - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址 2 v$ n* b V5 V3 ?! J
- client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口
9 D6 O/ a a) Z) \7 D: o9 S - ; r4 f, I! @2 R/ z! u
- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
! {+ \# B: K& i& f2 A6 t6 d - int client_socket = socket(AF_INET, SOCK_STREAM, 0);
1 C; d6 q& b6 e+ i7 P& }/ y, P" z - if (client_socket < 0)
8 y# `1 n( V6 {/ | - {
4 ^/ S# b4 y) N. o' }# ^ - printf("Create Socket Failed!\n"); 2 C( B& C3 M5 Y( _: U" l
- exit(1); & G" N& k& ^/ J5 _( Q6 N$ J, ^9 W
- }
5 C" x; `! G3 `: @ - " e7 P6 \) `# i( U; ?( _2 }
- // 把客户端的socket和客户端的socket地址结构绑定
W# W) B- F+ e- I" d( }9 S. r - if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))
! n8 }' n( f' n- w5 u6 t - {
) |7 G0 D3 o. n$ d. L& z - printf("Client Bind Port Failed!\n");
2 g u: D8 m9 U# A+ f - exit(1);
$ b& s5 f' |5 L; U3 u6 O7 a/ p+ ` - }
! I; e0 v! N3 @; c+ [" @
7 w, w" f; i6 v1 B8 S- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口 ! A l- R- t% H
- struct sockaddr_in server_addr;
5 z: O! y8 w, t - bzero(&server_addr, sizeof(server_addr));
: A) P# n7 v9 v/ N7 c* G! c - server_addr.sin_family = AF_INET; + ^0 @6 u* u1 d+ c
- . G) p: b* e( K
- // 服务器的IP地址来自程序的参数
" f$ o2 D$ B1 `5 d# R( k( X! ?0 P" p - if (inet_aton(argv[1], &server_addr.sin_addr) == 0)
6 l L% l: i' r' \; Z. j) q - {
1 `) }/ A6 I& n4 V9 N: j" O& j - printf("Server IP Address Error!\n"); 4 _& f$ u$ C+ {
- exit(1);
6 S2 S, E" Y9 W. A - } ' N: \% Y: j5 `8 N$ \
- ' [. z& L0 n& N# l- Z# \0 @
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
1 X; T6 G: x4 {4 K - socklen_t server_addr_length = sizeof(server_addr); , Y2 M0 K/ i$ [0 C* {" n& F$ J8 Q
- ) z. p& `2 h4 c/ J
- // 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 ' ]# d2 E/ {( o- s% [7 [
- if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
0 ?8 u$ r0 l/ |' y; I, O - {
9 ~1 d! w( h5 @& C& X - printf("Can Not Connect To %s!\n", argv[1]);
, G3 h4 h8 y! s0 ]% U - exit(1); t6 r3 T3 I6 V* m/ y7 V* k# W
- } ; V$ q& Z! I4 [) g. z
0 g) p. c( k2 L3 h) M- char file_name[FILE_NAME_MAX_SIZE + 1]; 0 l1 n4 Z8 u% Y3 L& N" Q3 F
- bzero(file_name, sizeof(file_name)); 9 ~+ g# Z4 Q$ t- `1 w: `' }
- printf("Please Input File Name On Server.\t"); ! p/ o. C* m# O8 ?
- scanf("%s", file_name);
4 |! o* @# L; D, x - ) s5 P* V" Q/ @5 K: Z
- char buffer[BUFFER_SIZE]; / `* b4 T: w; b: \7 }# I
- bzero(buffer, sizeof(buffer));
3 ~; O/ f/ D$ R3 s0 o2 {5 T - strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name)); " u0 J% h! b+ x5 O a( A& Y
- // 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 * z# Y. }2 @4 B) ^6 Y
- send(client_socket, buffer, BUFFER_SIZE, 0);
2 x% k" n, \& N7 K& J - 7 G5 ~' |! ]6 S. Z
- FILE *fp = fopen(file_name, "w");
9 l7 P6 {) I+ l2 Y! W, Q% g8 H! V8 O: N - if (fp == NULL) ; S2 A8 s! s. j( A( v( f" o
- {
$ V1 R5 e' p2 }2 m - printf("File:\t%s Can Not Open To Write!\n", file_name);
1 `' e: |, W% \. G - exit(1); |4 f9 w- _) N K# [; Z
- }
: m7 P$ u, a. f3 o- z
8 G4 ]$ b7 Z. t; y- // 从服务器端接收数据到buffer中
4 P$ F9 R7 W& n - bzero(buffer, sizeof(buffer));
+ i# W8 W( W: T8 s: l% u b+ K - int length = 0; # M# L) u9 O) q: I* V
- while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))
# l1 V1 I# m3 J# i1 @9 c- h - {
$ k" W: B4 r$ o4 g) K - if (length < 0)
: R5 D; ?+ t" d' l: s$ H9 U3 b+ _ - { 1 m' ~/ P! \4 J
- printf("Recieve Data From Server %s Failed!\n", argv[1]);
: ~0 N# P4 b8 u0 E6 } - break;
5 u$ M0 h: {; w8 K3 V0 i - } ; }2 Z% ]# e9 r+ h7 Q1 z6 S l C
* ^* `7 R/ `2 a: y- int write_length = fwrite(buffer, sizeof(char), length, fp);
5 i3 F8 U! C5 ]! Z - if (write_length < length)
( X0 T* j; @' l - { & z% R' W( R6 H$ P
- printf("File:\t%s Write Failed!\n", file_name); ; T6 h# l2 h6 u* `4 t5 a
- break;
; f$ B8 c. R, G( J, \2 {2 K/ h - } " Q/ \! i$ ]7 L6 ^- Z
- bzero(buffer, BUFFER_SIZE);
% |- z5 Y1 ^1 c6 R4 v - }
; _) Q: ^' W7 s& {( R3 ] - . H7 B& Q' i! {$ V. y4 V- z+ z
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]); ' S9 W f) \! b3 i7 p7 Q2 K
- " y9 M4 M& ^& H: [
- // 传输完毕,关闭socket
% } l! C4 f5 d6 u - fclose(fp); 1 R7 l5 [% I( B A7 A) e
- close(client_socket);
' \; I( ?; g2 J! V1 ^# e! ]! t" ` - return 0; " O/ b5 X& o2 W+ ]8 W# y
- # s0 B" @- B2 m0 ?
- } - [& P8 W* Z2 D- {
& L# E* [# q- {6 ^' D- E% Y$ W
复制代码- /*server.c*/
9 Q7 f4 Z/ m% g# c+ S - #include<netinet/in.h>$ @# y( M1 s8 E) _: f0 q
- #include<sys/types.h>
: J% t! Y+ y" O4 Z1 n* q: W" F7 k - #include<sys/socket.h>$ ]+ w- q$ O/ |( W7 ^0 H
- #include<stdio.h>
1 N, z4 |4 {7 l - #include<stdlib.h>! ]7 J0 a" \. N+ o5 g) Q# N
- #include<string.h>7 T# y4 ~2 H* B) s% i C: E5 Z
; U' M+ K$ I2 z; }7 D* [1 A- #define HELLO_WORLD_SERVER_PORT 6666 //端口号
" f- t- b: L( _& ]( x g7 j - #define LENGTH_OF_LISTEN_QUEUE 20
5 R+ e8 x8 u9 O' F( `( l' r( l/ o - #define BUFFER_SIZE 1024
9 X" P. _; ]9 H& O& R: W8 Y$ @ - #define FILE_NAME_MAX_SIZE 512
% b8 v. a4 f: }/ l
u) |: Y5 Z# }& p- P4 ]- int main(int argc, char **argv)
& h8 t# `" I5 u0 a - {
7 r- c s& L, {' y/ M" n- e - // set socket's address information
" O+ M: y! D) T4 j - // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
+ P1 M ^8 X2 x+ a- N* _" ^" M - struct sockaddr_in server_addr;
3 V( e" J9 o" u, \3 p& C - bzero(&server_addr, sizeof(server_addr));* U# v: o" S! J5 g
- server_addr.sin_family = AF_INET;
U& v5 J! x$ `6 C/ j/ m! F" Y - server_addr.sin_addr.s_addr = htons(INADDR_ANY);0 ]0 ^! G, e/ R" G! v; t+ D4 S+ p
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
[) O, A+ E1 H - * K2 J- c5 S5 ~7 D
- // create a stream socket7 u! Z) H- ]2 f! g7 i- J1 O$ H
- // 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* r! W9 x* \: m: d/ _
- int server_socket = socket(PF_INET, SOCK_STREAM, 0);/ {9 I/ f/ X( t& U
- if (server_socket < 0)7 i+ Y0 X8 B& m; c9 O5 l
- {) E& Q( b: f% Q; k
- printf("Create Socket Failed!\n");
$ V, I+ P/ B2 I- i3 k- J' W1 D - exit(1);
( W& N V, \6 L- N5 Y' V( D - }* H3 b- ?/ p. y' l6 a
- F# o7 g$ v7 {8 O! C3 [- u- // 把socket和socket地址结构绑定
( m4 E4 V( z# P - if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
# k1 z5 P2 X d - {
3 _& `6 d3 n1 r6 g: ?% B% R4 X3 n - printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);
- l7 g- ^0 g) _2 [ C - exit(1);
1 b3 C9 d7 B( Y; U5 z: G - }6 n) N. v0 I% u* X, _0 C: B
- 4 o0 H# M6 V8 _3 ~% V1 o
- // server_socket用于监听9 O/ C+ ~8 m, j# a3 M9 J
- if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))4 i4 P: e Z4 e
- {( h2 I4 m6 y- j0 v7 N. B
- printf("Server Listen Failed!\n");& j* G2 i$ D$ \8 c' M% ~, k
- exit(1);7 J* I R/ p7 \
- }; V! z& H( J5 \4 I5 W
- 6 B' T. Z, m, T W/ c5 r Q
- // 服务器端一直运行用以持续为客户端提供服务
8 J6 [. b; z* a y$ p, p - while(1)
) \: ?) R- K9 }" R6 |! E8 J - {
9 l) O' U6 ~+ L - // 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! |( |: i; g, J2 U
- // 接受此请求,同时将client端的地址和端口等信息写入client_addr中6 B# O7 w' a4 ?
- struct sockaddr_in client_addr;9 l# N, \* V, @0 N% ]- ~! n- g# {. o$ z9 r
- socklen_t length = sizeof(client_addr);( f+ |) P& ~# b2 a1 l) ], j) S
- ; n0 Z& v L( a) m0 l
- // 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
+ K9 C# Z/ G- R) U K2 M* a - // 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
. A1 u! h8 A$ k - // 用select()来实现超时检测
7 I& {" o# P% S* t - // 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" v6 f8 ?+ N% ]0 d
- // 这里的new_server_socket代表了这个通信通道4 V2 X% p" C- G7 k
- int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);
, F2 v& k" P% R. e - if (new_server_socket < 0)5 I5 L E1 j. ^6 ?0 w: w' O
- {
0 _& y* |$ J$ [# b4 D - printf("Server Accept Failed!\n");5 K/ |& { |$ v2 |- x
- break;
6 {3 K. j/ j1 K$ F - }
$ ]3 O2 ~$ u! [* W8 G. V, p' @ - / c9 C7 w q3 S) _$ P: j; a5 f
- char buffer[BUFFER_SIZE];; N, Y& D* J" k" |
- bzero(buffer, sizeof(buffer));
; m" @# A- m. W( t - length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);
( B2 |; q$ n0 b; r& c- w [ - if (length < 0)
5 J8 L" W3 K% h3 F6 h4 c4 N5 V - {* C2 ]6 `0 Y& A0 S4 ]- J3 D. r# F
- printf("Server Recieve Data Failed!\n");
; _! ^- {, @0 z1 j - break;
( q; l+ | _& t; ~! H - }
* |) e* K2 z8 e- J
* b' ]- n7 i) Q4 A; G- char file_name[FILE_NAME_MAX_SIZE + 1];) ~* e4 U6 N' b1 B
- bzero(file_name, sizeof(file_name));
. A* K2 C" B, t, f - strncpy(file_name, buffer,, [' F: k- b- F9 q2 ^; O- T
- strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));/ F9 H: f/ k; M" A9 V5 D! n$ d
& _1 w9 N8 ?$ U7 J% @# A( I- FILE *fp = fopen(file_name, "r");
% r6 j& f' [2 Z. ~ - if (fp == NULL)0 w# ]; E, z( @9 n% h
- {# t$ `- @6 N' d0 @8 S6 }
- printf("File:\t%s Not Found!\n", file_name);
# _' Q: c3 o$ |$ b1 ~% R - }2 h( B3 B( |4 E9 V; S- U
- else! V i1 E' Z$ @9 m) Y
- {$ Q. u! q8 B& M) d1 X+ ?
- bzero(buffer, BUFFER_SIZE);& o$ X# W- d; y" f
- int file_block_length = 0;+ c N. g7 o# a1 ]. |
- while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)5 F! Z5 j! w Z8 P; [* N' p% b, e. h
- {$ X( }" x! {( [8 t2 \2 f
- printf("file_block_length = %d\n", file_block_length);
" T) d7 r. l3 D6 h" R$ ]8 A( Z - 8 i- R4 t" [& q9 z0 c
- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端0 u5 V- E" i& X
- if (send(new_server_socket, buffer, file_block_length, 0) < 0)
( h) c! g% D- x7 G5 O# ?, \& a7 z - {
; \0 @6 e! y k$ D# u - printf("Send File:\t%s Failed!\n", file_name);
* u7 k1 ?6 ^/ I% V: D - break;
& p' k* ]4 c2 @# p. w - }
3 S7 g- X6 y# a1 N5 g - # a3 `" w2 L4 g& w. U
- bzero(buffer, sizeof(buffer));
9 Y ?# b- l, ~4 v/ ?# O9 m7 I3 l - }
7 f& s9 q8 u" D4 b& {( g4 f* } - fclose(fp);* R2 s6 p9 U+ A, y2 b% T4 I
- printf("File:\t%s Transfer Finished!\n", file_name);
7 Q- k% }4 N9 s/ P/ v - }
8 j1 u7 Z6 y' u# c - # z+ J% J% E! G' Q( |
- close(new_server_socket);
/ R: Q! |( Y' b/ ^ - }0 v( D" y8 U# A+ F" |
, ?9 d& |! E3 o1 o' x2 B: m- close(server_socket);$ Z5 G- _1 P. f9 H1 i. y5 j
- * c- g7 g* Z( g x- o0 N9 a
- return 0;+ V$ I8 X) w, _+ y
- }) X2 f+ U/ M" X
- ! q5 {9 T) B0 T6 P: E6 M
复制代码
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