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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.
U) T$ g( e4 R* c4 X) q- /*client.c*/
& @& {; Z* q* S# a) {; e2 B - #include<netinet/in.h> // for sockaddr_in : c8 I9 b! p6 E9 w, f
- #include<sys/types.h> // for socket
9 U' D4 n8 @% D3 U& U: b7 N3 a) @ - #include<sys/socket.h> // for socket
) }; ~) b) e7 S - #include<stdio.h> // for printf
5 a% _% n( {/ a4 f% B - #include<stdlib.h> // for exit
0 f, ]4 b8 a: [/ Q; l - #include<string.h> // for bzero
" _$ Z6 C$ I8 H" B L" _9 l
/ e, P g5 ~ y% f5 L1 l! t- #define HELLO_WORLD_SERVER_PORT 6666 5 u8 W" L7 U, Z% l
- #define BUFFER_SIZE 1024
: p$ z8 e/ j! N - #define FILE_NAME_MAX_SIZE 512 1 }4 ?) R5 w7 |- i$ U% ~
8 P, y ~: P7 A& X4 k- int main(int argc, char **argv) . ?8 t y" `' \" u# }
- {
# c! \& t% n( S2 o - if (argc != 2)
5 u; j3 q: |, l% Q% h1 g- E% H - { ; y* d1 [/ l0 r ^/ f j+ D/ {+ J
- printf("Usage: ./%s ServerIPAddress\n", argv[0]); 8 O* F" a8 P) ^4 `
- exit(1); 5 i% m( b0 |1 X; U# w0 G
- } 6 N% C6 u0 R$ p6 ?5 S I) C
- 1 X1 Q( P3 Y u, t6 e+ ]
- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口 9 P4 r+ C% q6 U6 @8 a7 J
- struct sockaddr_in client_addr;
' ?* m3 [9 G) u: `9 E p8 r - bzero(&client_addr, sizeof(client_addr));
/ f3 o) H8 R G$ p - client_addr.sin_family = AF_INET; // internet协议族 9 j0 l3 w6 [$ M2 P2 X6 Y
- client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址 4 T5 U; m; G- Z! ^4 B! |1 ?
- client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口
5 W* l( C) h: h& g* X3 @1 c, S8 t - % I0 l0 N L+ G6 u8 I$ X7 F) W
- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
4 k8 a* W( h$ f0 I! ^ - int client_socket = socket(AF_INET, SOCK_STREAM, 0);
1 Y" W# Z$ ^' t1 J1 Z - if (client_socket < 0)
; U6 [2 v* B4 Q& b% @ - { - j6 `4 i* f: q% @7 D4 {
- printf("Create Socket Failed!\n"); + x9 w, K, D( r8 M
- exit(1);
- V ^, Y5 v0 }- w3 G( A - } " v- Q9 l- h0 F [
5 j* ]' `7 R7 p+ O# K+ v- // 把客户端的socket和客户端的socket地址结构绑定 6 L$ S" P/ q. k" N# Y/ Z, i& c
- if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr))) ' S! O. J& o/ X4 g1 m
- { , G/ n' d' z! _0 h4 @
- printf("Client Bind Port Failed!\n"); 3 K6 `9 m( i; |! `
- exit(1); ( A/ b. f8 u4 C- w% V
- } 5 l1 Z1 w: O+ }- ?/ Y
- # C' N6 G) R& n; N8 }
- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口
( |- i8 s5 r5 l7 ]: [ - struct sockaddr_in server_addr; ) U5 @8 R& i9 ~4 e. C1 q
- bzero(&server_addr, sizeof(server_addr)); , l0 E0 b2 ?, n
- server_addr.sin_family = AF_INET;
7 q7 E: z3 T& D( e/ N7 J
! K! C1 F5 B- E& P( P6 Y& N- // 服务器的IP地址来自程序的参数
: o9 [- ~. n# F0 | - if (inet_aton(argv[1], &server_addr.sin_addr) == 0) . R# F! ?4 n- e, v* j+ M5 o6 }3 X: K- Z
- {
: N" w9 z$ A4 @: C! p- Z9 ] - printf("Server IP Address Error!\n");
5 e, o* v1 h" V5 S+ J6 ]' ]) E - exit(1); ' K9 T+ c! D' J/ O
- }
' p2 j o2 I3 a4 p- v; C) C8 C - 0 h* R/ Z1 U) r4 X8 J
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); / _8 x' b _# n: O
- socklen_t server_addr_length = sizeof(server_addr);
& R$ X3 A3 ~2 r. z8 q. M$ d0 k; a - $ M+ e; s. w: \0 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 8 |) I# C5 V0 S( i2 d
- if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)
- B S* ^+ M M) e7 q' }( T* h - {
7 C& x. D( a, f - printf("Can Not Connect To %s!\n", argv[1]); . e7 z; _6 Y. g6 v) {
- exit(1);
* c8 g" D) e) ]: D L/ I - } ! `+ T8 O) X3 o0 ^' B4 j: ^0 Z8 H
* @9 F% x5 e6 }$ N* }- char file_name[FILE_NAME_MAX_SIZE + 1]; ' V. H* S* ?/ i) a" Y$ N
- bzero(file_name, sizeof(file_name)); 2 V6 p- U7 M Y" F# e
- printf("Please Input File Name On Server.\t");
* R3 n* K5 Y8 Q2 E0 } - scanf("%s", file_name);
4 ]+ O9 H7 L5 F0 M- n6 I - 1 t1 Q/ k6 v7 ` C% Q5 T1 {( w% S
- char buffer[BUFFER_SIZE]; - C L7 w4 R7 E2 P
- bzero(buffer, sizeof(buffer)); 2 V* C9 T4 ~- q/ ]
- strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));
: M4 l. t# o9 H! L% Z# q+ F - // 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 u9 H0 i2 Z2 N, |
- send(client_socket, buffer, BUFFER_SIZE, 0); - E I* \2 y- r9 H1 q/ @
G" X# i0 g$ H9 ~- FILE *fp = fopen(file_name, "w");
2 E% ], |/ J7 n - if (fp == NULL)
\; f9 W8 c; T- c. x1 B2 d - { 1 o# p* A: L; D- p' E* w
- printf("File:\t%s Can Not Open To Write!\n", file_name);
2 O, ~9 B) N7 Y2 ?2 L% X7 D% F - exit(1);
8 h( K% @- A% E: b) ~ - } ; w+ j+ n$ A. ^1 ?" h4 m
- ~0 k. _* b g v
- // 从服务器端接收数据到buffer中
2 P! X, c6 X* E - bzero(buffer, sizeof(buffer));
1 |% O5 p. V6 I" ^$ u( ?! e# w - int length = 0; ' p' N1 j3 G6 U1 N, c" T
- while(length = recv(client_socket, buffer, BUFFER_SIZE, 0)) 5 {) a% O4 Y% s
- { 0 E( H) ]: z% H4 O
- if (length < 0)
T2 z |& K* v) \" E8 M2 b. {/ { - {
& g9 h$ _( \5 [3 l" J" y - printf("Recieve Data From Server %s Failed!\n", argv[1]);
- e E) | Q& {% ?6 p - break;
* H( K& A& |+ J- o. U3 _/ H; g; N - } : w5 I+ i9 f4 c9 O
- 4 g) w9 H3 _- b0 Z0 t& k1 f3 U
- int write_length = fwrite(buffer, sizeof(char), length, fp);
+ ?* o7 E+ q% n2 P% s: X, X - if (write_length < length) , H" [( C! `- A- k2 W, S
- {
3 v5 X4 [% {! {, A. U. t) @ - printf("File:\t%s Write Failed!\n", file_name);
{- b% k+ b1 g: _( K& J3 S - break; / V0 g; o$ m. i0 I4 O5 H/ l
- } & s1 ?2 l$ h/ l
- bzero(buffer, BUFFER_SIZE); : o% m* M4 f3 `5 }. J6 w: L% \$ z
- }
/ f4 h. K( _8 x6 A
$ i) P' f* X& b! ]4 L: k0 t# q3 \- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]);
1 `) e S) l0 S+ J' D& r
' e3 b9 G2 [0 A) j6 P- // 传输完毕,关闭socket
+ V% N: N1 Q* B - fclose(fp); 5 d( l5 p" C1 x5 ^' f* h
- close(client_socket); 5 N4 f3 |: t! @# {) {0 K$ C5 p7 h
- return 0;
3 G8 a6 g) M0 D/ A
8 w% o# e- `! W. o, Z1 n* Z- } : i, p, ]1 O' w! W; ?
- 1 V/ W1 P7 L, d* Q6 j. [7 Q. i) F
复制代码- /*server.c*/" F) {0 U6 M. F6 f% {4 ~ d3 j& h
- #include<netinet/in.h>. m8 U! f6 u: i- K& ?1 f O. |% H" z
- #include<sys/types.h>0 f1 o0 G0 f& |( s$ a/ D- ~! @
- #include<sys/socket.h>
$ r6 _/ C5 c" G3 [- ` - #include<stdio.h>7 m* l6 N( s5 V2 u4 h
- #include<stdlib.h> l, K/ l' l I) @* ?( [
- #include<string.h>
O. k( S* S+ v G' V6 Q
1 w: p" X5 X' J; a t- #define HELLO_WORLD_SERVER_PORT 6666 //端口号
# l) o7 ^4 }) u x - #define LENGTH_OF_LISTEN_QUEUE 20% _$ B3 f& Z; s7 ?6 \; J9 \% m/ N. m
- #define BUFFER_SIZE 1024
8 F! o2 [" G( U/ z5 z7 f, | - #define FILE_NAME_MAX_SIZE 512
! B* z0 n( M# U% C) S5 \7 A - % B& H+ i: I4 @( i# `% o
- int main(int argc, char **argv)5 v% E: m# N5 P! G* j8 D+ Y
- {5 m O1 ^+ y; j5 V
- // set socket's address information1 ]& W( Q5 t( w4 y: i
- // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
9 H* Y6 D) U. \# C$ t - struct sockaddr_in server_addr;- P/ }/ j( M! I4 f2 h
- bzero(&server_addr, sizeof(server_addr));1 c4 S$ O) p8 g
- server_addr.sin_family = AF_INET;
5 v* y0 i6 ]. u+ ^ - server_addr.sin_addr.s_addr = htons(INADDR_ANY); d/ a! x* s9 e. W" R; }3 j
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);$ S0 a' f! O) A7 O
- " j& X+ h0 ~7 i' Z
- // create a stream socket
# ]; O; {. @2 z6 c* j( a5 { - // 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
; |2 }! y' D$ Q a; L5 { - int server_socket = socket(PF_INET, SOCK_STREAM, 0);; ~1 E! u: @- v* L
- if (server_socket < 0)) {* H, z' w0 S9 \6 L) a# F2 I* t
- {
) @/ e$ h$ A# X% a3 S6 q - printf("Create Socket Failed!\n");
: n2 d7 ?3 D2 n8 b: g! w! b - exit(1);: V/ F6 I/ D/ J5 T8 e+ ~) i
- }9 _1 ~5 ?( a' c$ R2 A' B
- ; Z/ }2 |% j; J2 m4 j& I
- // 把socket和socket地址结构绑定) X0 k/ x" m9 f# |, j
- if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
; i1 n. K0 z6 c. G - {
; s3 E! P. s2 K+ T& [: @ - printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);* I; _; { T& P0 r6 @4 a+ O" }
- exit(1);
) q. U+ Y& X" } - }
) {9 S5 m! X- U9 O4 g( Z+ P& y
2 c/ Q2 e g& N8 W: D6 e- // server_socket用于监听( R; `$ ~& u' X; J* f: e2 B1 @
- if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
7 d( O( n9 y$ j6 [8 v - {/ q8 t% W9 S0 H4 x. B. H. n
- printf("Server Listen Failed!\n");( d) U' d+ u6 _- F
- exit(1);! R% \9 Y, r. o5 y+ Y
- }, ^- {* D: u y- \; |" e
- 6 v4 V# _$ X$ h! P0 ~6 ?8 u+ ^/ k
- // 服务器端一直运行用以持续为客户端提供服务1 _* M1 S) a5 X2 n8 d& I; c+ r
- while(1)
% i3 B8 O0 v% h% O! I# j - {
. j% O% v8 A" c0 P+ K - // 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
Y& L% ]. t9 G& X: 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% g1 @4 E) u8 P
- struct sockaddr_in client_addr;
0 p; p9 w/ y& N7 P* x - socklen_t length = sizeof(client_addr);
* S" M4 C/ H8 i. h
" Q. a. R" Z8 q% n! s" h3 g. G4 W- // 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
& h7 w9 o, F/ d8 {3 O. S - // 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
3 T' j+ D0 ?; @9 C! [& a - // 用select()来实现超时检测
% R# A# A9 x) K2 J: c - // 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4 t+ ^1 e: E, j6 P: g8 f0 W
- // 这里的new_server_socket代表了这个通信通道! _% K# ?; f1 _4 O3 u" ~6 S4 ?" S
- int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);
+ e6 O. e! t/ K5 p - if (new_server_socket < 0)
6 @0 }1 D9 o& o. D - {
. x, g+ _. ^! s5 u& ~* j q1 z - printf("Server Accept Failed!\n");- }8 E4 f! ?( v8 ]2 t/ b, V
- break;" c% O" N+ T6 P5 V9 ?
- }& B# Y9 I' ]2 q2 }( s
- 7 n1 h& S& X% u
- char buffer[BUFFER_SIZE];! f5 j: F3 R# e1 ]
- bzero(buffer, sizeof(buffer));
' ]( {, [( W3 p7 E% W. t - length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);4 S- ], d3 J8 e H
- if (length < 0)5 F/ g, q/ {0 P9 o
- {$ `6 E( l8 w$ U
- printf("Server Recieve Data Failed!\n");
. G' v0 q7 J ^- |# B - break;) ^2 T* G) P2 W o& a9 u) o% U" K
- }
/ [) j) r c" s/ Z6 x4 P3 q - 5 |) o, h- n7 [) Y# Y% J" l
- char file_name[FILE_NAME_MAX_SIZE + 1];6 \3 ]; Y( z3 L8 \' j
- bzero(file_name, sizeof(file_name));
7 N, u5 r" H4 r% F4 Q - strncpy(file_name, buffer,
/ V9 W( R o& r) A3 k - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));
# A. H9 r& Z3 L& B4 u3 ^* i
; \$ y% \2 b6 s. c# b- FILE *fp = fopen(file_name, "r");2 H6 c% |$ ?; }) K& w E
- if (fp == NULL)! q4 v m# z$ o$ N' n
- {
& M" X q0 P: X1 Q& U - printf("File:\t%s Not Found!\n", file_name);/ G+ K2 Q" L! k3 S6 D% W
- }: f& [- X1 G2 F) N- j- P
- else
. B( ^! ^4 f$ e+ W& a - {( J% V9 Y% ?) W, I1 J* s/ V
- bzero(buffer, BUFFER_SIZE);7 Z# P; x [, B7 f. T
- int file_block_length = 0;8 g3 z( C8 {3 e6 U/ _+ \2 N9 f: J
- while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
1 Y1 W9 j) {# e& ~ - {
3 G Q' Y4 `8 y" Z9 O7 f! X' ] - printf("file_block_length = %d\n", file_block_length);3 O! l- @* b) E1 k/ N
! ~) O$ @ \& b& G. p5 i& d8 e# K" ~- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
% t$ J1 |: K, s s - if (send(new_server_socket, buffer, file_block_length, 0) < 0)& }$ K! r, n/ x0 T( ]: E7 w
- {
! o x9 N4 l! N8 L6 S" H. C0 e# Z - printf("Send File:\t%s Failed!\n", file_name);
/ ?! p3 V8 q! c; I+ W/ i - break;! ]* d+ S0 H7 v2 G }: v. B
- }" s) B* K5 G* c+ e9 X5 M8 Q% Z, A
8 R* s& f- ?8 O4 M- bzero(buffer, sizeof(buffer));
! ]4 `- [6 W; X - }- c3 y' d& c" I; L; n. @9 i
- fclose(fp);
# L5 Y" X# X* ^/ q2 b4 n; N; O3 r$ ~0 e - printf("File:\t%s Transfer Finished!\n", file_name);9 q9 c! @1 Q1 {9 `- A. f
- }
; U% R- K- Q- H" E
& ~4 g4 R1 k" @# h0 ?- close(new_server_socket);# I$ O1 E$ V; |2 Z2 Y: k1 ^
- }+ e4 ^) J, n! x: R, D
7 N x- u) M! N5 g9 h( T! K- close(server_socket);
7 r& |- Y0 M& @( W4 v# r
9 Q7 o" J3 d( {/ f- return 0;
: H$ ^( k3 D3 i, z - }
& m7 R- P: {% @4 h( t2 ^+ n$ j
# X0 x7 q/ M; C0 h
复制代码 # o+ ~# S1 |: w! _- {5 l
) o- i0 Y& s7 q8 t; p+ J1 [" ~2 ]9 e
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