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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.% Q- M! U' F" G& R2 D
- /*client.c*/
( M' t2 A+ d( g; `: s5 {- y - #include<netinet/in.h> // for sockaddr_in ^" a" X9 e p! m9 u
- #include<sys/types.h> // for socket
! c" U/ x% W( T( R - #include<sys/socket.h> // for socket
" o8 K7 y& Y- ]4 t - #include<stdio.h> // for printf ! {! A& S9 V3 |
- #include<stdlib.h> // for exit 4 ^) B8 X" p9 r+ a- O* Q
- #include<string.h> // for bzero
G+ L& _+ \$ T/ X# l' s8 z - 1 \# p( C5 ]* V6 n+ p
- #define HELLO_WORLD_SERVER_PORT 6666 . h) e% K& N3 D1 R8 s
- #define BUFFER_SIZE 1024 2 l1 z( }* B' X/ h
- #define FILE_NAME_MAX_SIZE 512
% ^; |2 u) v) ^# h( Y4 c
M v' r/ o, M# g% V* T- int main(int argc, char **argv)
/ I0 x! ]+ u$ a2 r - {
N/ G5 N$ i2 _# X - if (argc != 2)
( E' K' B1 x6 R! P g - {
& _9 }9 R0 o- l% k6 g+ R - printf("Usage: ./%s ServerIPAddress\n", argv[0]); 1 k1 H% L: d0 t- I
- exit(1); / a1 A T+ { z* W/ G6 J
- }
% O9 M9 p1 w" |9 X9 c - 9 O% T7 q2 r2 q ^9 F
- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
* \+ x. H! ~$ ]4 q! U/ }! l* Z - struct sockaddr_in client_addr; 7 p4 O4 O; x+ a. n% B% B
- bzero(&client_addr, sizeof(client_addr)); # l2 J6 ^) ]( P# Q- k+ {
- client_addr.sin_family = AF_INET; // internet协议族 8 P' n5 L1 |: @+ p2 R- }- f" x
- client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址 , g6 D ]8 L- \- ~/ p. L4 D: J
- client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口
l& F N; P0 }3 Q) A+ W
2 K+ K( x9 d: h$ c) l- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket ; S* d2 K) z# O% L- h
- int client_socket = socket(AF_INET, SOCK_STREAM, 0); ! Q% t/ v( x* q. G( v
- if (client_socket < 0) 6 ]3 Y! K/ @, }1 C: h' @' u
- { ) z5 l. Y$ n" @
- printf("Create Socket Failed!\n"); - z) [4 @! \3 z
- exit(1);
* E% q: n, @9 G7 e* D0 d - } ( y9 N+ U6 _# Z: U. g. ]: e# X; A" e
- . h5 R7 v r& P- y
- // 把客户端的socket和客户端的socket地址结构绑定
# B' r+ t+ R& |6 G0 L0 \$ X d - if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))
# \ p4 w8 X8 q/ q! U - {
- Y. T) G! L' N( @ - printf("Client Bind Port Failed!\n"); . l4 H9 d9 @5 ]* M
- exit(1); / j8 k9 C4 ^* a
- }
( N) _3 M$ o8 m - ! Z! V5 d* P7 X& _( p0 i
- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口 * J4 K# I) \. \5 Z8 q6 X( Z* f
- struct sockaddr_in server_addr;
) A5 s* w( _$ i& d - bzero(&server_addr, sizeof(server_addr)); + d, f3 G: f9 [9 d0 a# n
- server_addr.sin_family = AF_INET;
+ o, R& g8 q+ B' P( f
' _, e/ k2 Y, ~2 W! m2 Q, O- h- // 服务器的IP地址来自程序的参数 7 c8 Y& { {5 `0 X4 G
- if (inet_aton(argv[1], &server_addr.sin_addr) == 0)
2 n) ^1 A1 G% |2 e - { : f- E0 p, O6 T
- printf("Server IP Address Error!\n");
/ [; X3 m, ^& D; H% x - exit(1);
/ q# ~& ?" R. Y - } / V6 ?3 p: J4 v5 C" D5 d
- # D- ~7 s3 s7 @" w& o: c8 @! w2 p3 P) y' U
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); 4 }! e3 X' ^) ?0 C6 e/ |- H _
- socklen_t server_addr_length = sizeof(server_addr);
+ o. p3 l0 {: G - 2 d4 P8 ?; Z# `: `* f+ E" U
- // 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
5 x; K3 d6 g) k* X3 Q5 G0 k/ @- `' [ - if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
+ s7 t5 M: ?( w0 d% `( ?2 ~ - {
/ g" O7 v$ Y1 `$ i - printf("Can Not Connect To %s!\n", argv[1]); $ x& q" C/ P$ A6 ~! l
- exit(1); 2 }6 t/ X7 o! b& m/ y
- } 2 b+ D& F: r- L3 m( {9 x# i. h
- s2 q! Q3 Z( N$ j, g
- char file_name[FILE_NAME_MAX_SIZE + 1]; : O# S7 j9 V) B. z5 K/ y2 ]: Y# j
- bzero(file_name, sizeof(file_name));
5 W+ ?9 n6 A/ q( ~2 m2 V. W - printf("Please Input File Name On Server.\t"); 4 d2 D C, P1 c6 ^8 j
- scanf("%s", file_name); . q u: F) I1 d) b0 [, O
- % R/ l a0 U5 P! Z# F9 h. i
- char buffer[BUFFER_SIZE];
8 k+ R2 l3 G3 U4 X# i - bzero(buffer, sizeof(buffer)); ) l1 E6 Y9 i9 t; D# i! U
- strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name)); $ i: X& L, S$ S, B
- // 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 5 V6 H) c2 D/ D
- send(client_socket, buffer, BUFFER_SIZE, 0); ; h# q* s* Q& y0 d( v; u' p
- 6 ?& A, c# A+ b
- FILE *fp = fopen(file_name, "w");
/ Y& ^0 g6 T% ?$ _( Y - if (fp == NULL)
9 B' ~8 q, [) F/ d0 o - {
0 i) S) ?8 r9 H% ] - printf("File:\t%s Can Not Open To Write!\n", file_name); / W% P! n8 E+ o4 K) E6 x4 @* }
- exit(1); ; j# W w R' K! Y* t
- }
: K8 D9 N/ R9 r - ) x# o/ u5 f4 r3 E# d
- // 从服务器端接收数据到buffer中
. t* ~: a& _: S5 M& J, v% h9 e - bzero(buffer, sizeof(buffer));
7 H* X( x+ T* X5 y9 z - int length = 0; 7 d: W* b- q6 a& [: S7 M
- while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))
) T7 \; `/ p/ u7 ]" r - { # H2 V3 P4 A( H- o* ]8 T. t
- if (length < 0)
7 V3 q+ e9 |5 J! Z: T- D - { : Z% }" I* r% j6 l0 [/ \
- printf("Recieve Data From Server %s Failed!\n", argv[1]);
3 j! t1 r) j2 L/ z- o - break;
1 C2 a9 z, k0 h8 w+ ?, `; D - } , D; Z9 n8 p/ j: U6 W- J/ Y
- 4 c- s/ b8 x: u2 ^8 h2 x
- int write_length = fwrite(buffer, sizeof(char), length, fp);
" J% v9 B1 c/ P9 s" \ - if (write_length < length)
1 E% n" k7 Q) x7 H. P - {
/ V' f Z r1 n! J - printf("File:\t%s Write Failed!\n", file_name); 2 X. M4 f/ s, Y. g& o, S- v8 ?8 V
- break;
9 Z+ L( t# G( _ - }
6 u5 O0 a4 t- l/ n; x- f8 q - bzero(buffer, BUFFER_SIZE);
9 e( P+ L3 S7 W( ~1 w, ?( S - } 1 p0 a/ Z) y2 A2 S; `( A, T1 `
, u4 i" u7 m9 j3 S, ^. o5 Q- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]); q- l5 f9 Q: p, t9 x, S7 _: P2 v% A, d9 S
( L* |6 F8 Z' {- // 传输完毕,关闭socket
1 w9 x1 a7 ?/ @ - fclose(fp); ) t9 @, ^ i& g& \* q
- close(client_socket); 7 [1 Q" l+ _% p& ?( `3 f, A
- return 0; $ x, V! H/ T1 W' r. `
- t& h* H5 o) \. J0 C. H
- }
5 v' J, z; ]! B8 b' |3 N5 |# { - " d3 g1 m( _: f& M. a
复制代码- /*server.c*/
3 o' v9 a( _7 w7 E3 T - #include<netinet/in.h>$ D& Q0 J3 @; A( q/ h9 l% [
- #include<sys/types.h>
; S% F9 J F: g6 v - #include<sys/socket.h>: [8 ]" x5 ], z' \9 |) f' I$ d3 e
- #include<stdio.h>
. K1 Z( E0 _; ~8 B# H - #include<stdlib.h>
" x0 r3 N, E7 |3 E c8 H - #include<string.h>
7 s3 D A# G2 f - $ G& @& V7 N$ X* x% A( x
- #define HELLO_WORLD_SERVER_PORT 6666 //端口号
2 K, f* n+ s& ?. x$ ~$ { - #define LENGTH_OF_LISTEN_QUEUE 20; ~' p- O" S% v/ p" R# ^% t. `$ E
- #define BUFFER_SIZE 1024% [* R! f8 _# G. @: D
- #define FILE_NAME_MAX_SIZE 512
# K/ n- g' o& R. m6 ~
. u4 \' o1 s4 t) G- int main(int argc, char **argv)
* ~& g2 s5 u( [3 Y2 j5 N+ |9 f5 e - {, |6 n6 f8 |5 s2 N2 G1 r- j
- // set socket's address information; j0 A- v" b9 ?/ \9 @% W
- // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
+ c, j' S6 c7 X: \ z* s - struct sockaddr_in server_addr;
" @% V* |' [ z& l - bzero(&server_addr, sizeof(server_addr));' H1 E; g2 |2 }' i
- server_addr.sin_family = AF_INET;$ C9 D; x" i2 X+ r
- server_addr.sin_addr.s_addr = htons(INADDR_ANY);- a6 w; I8 A" u
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
' i8 c$ P! \9 }% o: \8 M; ]& D0 d - + `, I! t% @9 e& e; \( R
- // create a stream socket
; L0 W3 r. Q; C- A7 n5 @8 j - // 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
8 R) o l3 h7 ~* c2 d - int server_socket = socket(PF_INET, SOCK_STREAM, 0);, l8 V& p( ` P0 B$ y+ g$ j
- if (server_socket < 0)
$ ~1 `3 K. V) R! { - {' h4 q6 x% T2 ]9 a
- printf("Create Socket Failed!\n");
8 T' V' T' D% |* I5 b - exit(1);
+ y4 T8 @5 s+ X( o - }
3 W) {8 J5 p l0 E - 3 F z/ J n) S
- // 把socket和socket地址结构绑定" J# N+ ]9 j, h1 A
- if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
5 n4 O- s7 V) A5 X+ W: ?8 F* R - {5 D4 ?7 y% S! X0 U8 E
- printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);
3 E L. M% @, `- j8 d" ~ - exit(1);: ?3 `0 J4 b, ^/ \% ~( { }
- }, y. K6 q& i- G0 m
5 f" ]2 q' r# o* }- J4 n# j2 O V* {- // server_socket用于监听9 k8 V/ d6 k U/ V6 M, M0 X
- if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))! f4 v8 j+ }" t# e* E
- {
4 M- \; O j) d Q. t - printf("Server Listen Failed!\n");9 p/ i X5 Q" p+ t9 T% h+ A9 E3 X& Z
- exit(1); z( L3 |% W& h k* r
- }
4 |% ~+ K3 l! P0 Z# f; o, B* N4 H - ! h9 d- j6 l4 R$ e
- // 服务器端一直运行用以持续为客户端提供服务
+ x! Z8 d( g8 J0 |' U( W) w - while(1)2 D7 D8 ? T- x8 @* `7 S4 U q
- {
' @7 N$ A$ j, x% T- \& @ - // 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% G( |3 J: I% k3 L/ 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: g- Z, m' t9 B% M. I5 _
- struct sockaddr_in client_addr;3 G) o' n$ m8 w# H
- socklen_t length = sizeof(client_addr);
! J7 ]3 [8 r7 X! X
2 u& ?7 s+ W8 U; }- // 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7 p- N9 O# h) c4 ]- N
- // 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: i( n; E5 y3 \% C$ n7 U' ?
- // 用select()来实现超时检测2 o: P- K# Z% Z
- // 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 y% O1 E& {0 c4 B, j* O ~
- // 这里的new_server_socket代表了这个通信通道
( E9 h/ s/ a, r$ J# R% F% E - int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);
% ~! ?. F4 s1 J1 J - if (new_server_socket < 0)
g0 ^% e4 M; o: b* U - {
5 m' N1 A \; f - printf("Server Accept Failed!\n");0 c! }( [6 q, B
- break;
0 c4 W% E3 D. ^; `& n - }
5 c. r3 `% Z- H/ g
% B" a2 y- G+ |0 ^: F% a- char buffer[BUFFER_SIZE];
1 j( `" X) P# |- O8 y& n3 V - bzero(buffer, sizeof(buffer));" p6 W! o8 Q5 F7 M
- length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);
- |8 z2 H8 M1 I5 B2 Z* g - if (length < 0)* V- K/ F! L$ Q1 g* `' ?2 H" t
- {
( p7 o$ }( d0 I' \( a+ i* w - printf("Server Recieve Data Failed!\n");
# k% e; U7 s7 ]: | - break;
3 T+ u; c$ X' t, q" g1 Q - }
# v% w) t6 `/ K4 ~- l; {/ R
4 t- {5 p q5 [# ~* |- char file_name[FILE_NAME_MAX_SIZE + 1];
4 q/ n) a6 y1 ~4 Y3 h - bzero(file_name, sizeof(file_name));
* O" Q8 { @( A2 u* X1 G* ^+ d - strncpy(file_name, buffer,
( X0 a% B1 A; N3 ] - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));
4 n/ [' Q7 B+ M! e
n3 t- r3 r0 Q- Q; @- FILE *fp = fopen(file_name, "r");
/ u2 _3 q8 n" o% T - if (fp == NULL)
* z: l) [# C. K5 V7 w - {
7 q+ H, A' z/ Y5 Z - printf("File:\t%s Not Found!\n", file_name);
6 |; j3 i8 L9 [5 A( L9 Y# P - }, @( F6 `% C9 u' o6 J
- else* k( y+ f+ i+ w% Z N- L; p
- {1 l, M3 l R6 n) B4 z7 z
- bzero(buffer, BUFFER_SIZE);, Z3 B# {& Y4 p2 x' Q% s
- int file_block_length = 0;
a( x D' V4 o0 j - while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)* Q7 }+ V5 N. l+ F, N# r- D
- {/ \/ B' f2 ]% k
- printf("file_block_length = %d\n", file_block_length);8 b7 P( n6 z4 e0 I$ L+ n
- . q, h/ k% U7 H! @. u0 E
- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端* l# x" B0 `+ }' e
- if (send(new_server_socket, buffer, file_block_length, 0) < 0)- C- k" ]; J# z# N$ _
- {
9 a0 l! J/ \5 ^$ S4 l - printf("Send File:\t%s Failed!\n", file_name);
4 C" j6 `8 |- o' h0 h - break;
6 ?3 k" V& ]( S. b' i* ^/ _ - }5 U( n) D0 r6 i2 g1 C$ k, [
- & s9 u( o! p/ v: R& X- M9 v
- bzero(buffer, sizeof(buffer));( i1 A7 O' `% y K, u7 P
- }2 J" @# |2 W, m) ?+ x# i
- fclose(fp);2 P. W/ X' k- x D% p
- printf("File:\t%s Transfer Finished!\n", file_name);. z6 M, R( f+ w1 O+ J
- }
3 N5 p% O9 ]) y, c8 H$ Z Z
* U4 b# S4 V& i+ \/ b3 Y- close(new_server_socket);
9 i5 v- x9 L5 i" j4 I - }
$ V! \# l7 j+ Z. D" T - 0 U$ l1 ~: L: j5 z8 r" d7 r
- close(server_socket);$ Z4 m" D" Z* L+ A0 _: f: X# [
- ) R' G7 _3 K$ V5 o$ D
- return 0;
; U) L1 Z# }# e' s - }
) l) m, `# e; B1 H+ P" m5 w# t; X q+ c
' F2 r- X) \& Z. N2 `
复制代码 / }2 \) `( i; [9 M x- G1 g: x# |+ Q
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