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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' M* O( Y/ @; |5 E6 U- /*client.c*/
) @. R# K0 Z! |# ]+ z# ?) m8 U - #include<netinet/in.h> // for sockaddr_in
* O# Q, m1 Z' r1 b" y4 F5 v1 n9 J' } - #include<sys/types.h> // for socket ' J1 S4 Z, H7 [3 Q' _; X
- #include<sys/socket.h> // for socket
/ R. L2 W R* ~% H3 H6 B* H - #include<stdio.h> // for printf
; b7 u2 o% z0 `0 j - #include<stdlib.h> // for exit / k" _- A( V5 B) K, O1 R: d
- #include<string.h> // for bzero
; H$ `5 J4 q% [# s7 P$ M0 b+ @
" a) r: A$ b$ g& ~8 x6 w- #define HELLO_WORLD_SERVER_PORT 6666 ( Q6 x$ d. a1 ~
- #define BUFFER_SIZE 1024
( w' r; s6 q% U! ~6 }* L' U5 G* P - #define FILE_NAME_MAX_SIZE 512 5 z# F7 w" D1 N! {/ t; a* i' z
+ y6 l: _/ ]2 a6 \! C; W( e- int main(int argc, char **argv) ' s8 m. C& J2 u( B6 w
- { 6 P; X0 w, S' x* k( c
- if (argc != 2) ' e0 ^% }- Y. ?$ H
- { ' r$ C. V3 d: r) D7 j" {& a d. `
- printf("Usage: ./%s ServerIPAddress\n", argv[0]);
% Z7 _% B! n( G, O+ m - exit(1);
1 l$ o3 U0 j; X4 ] - }
$ \7 D4 z% r8 U' }
9 W2 E D5 a1 v, V5 P- X1 p4 N- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
8 B* y [% L2 j% k( @; M8 I) W - struct sockaddr_in client_addr; L! u8 M4 C+ x F' z5 N: _
- bzero(&client_addr, sizeof(client_addr));
5 i& n# z0 |7 N- ]$ { - client_addr.sin_family = AF_INET; // internet协议族 + n1 S! R% j+ o. k- f% ^4 n) Z
- client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址 ; r( M, r1 ^; a# w
- client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口 0 R0 S6 a3 z4 i* H8 l
) f U- _7 f7 G8 @- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket * [" u) ~: [6 h( C4 A
- int client_socket = socket(AF_INET, SOCK_STREAM, 0);
" k0 i9 y, q6 U* s* p4 e. \/ ?# c - if (client_socket < 0)
. p- N b- j0 }3 ^: M" q - {
, N- y" j8 |& Y! u' _ - printf("Create Socket Failed!\n");
3 N- h( q/ d0 x4 R, S - exit(1);
0 P' G2 E2 \4 D. T# S' e& { - }
6 O) ?4 ?% ]; D- k: m: J) O% l - : X0 G( h0 ^ e
- // 把客户端的socket和客户端的socket地址结构绑定
$ N1 u8 X7 V' D' y- J. l! R4 Z - if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))
$ U5 @0 u; e c, [0 L8 d - {
& h( K6 i4 j. r# o( x: D5 l( S - printf("Client Bind Port Failed!\n");
. _" I% [8 W1 U/ d! x% j - exit(1);
4 Y X/ |; a% g# j; U# {" W - }
/ o% P; z6 U- V2 |+ r" Q, g5 N
' k, X' H# D$ T) z+ U, E% E, g$ a4 f- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口 4 i4 L9 y" @' W: S' g) I3 G
- struct sockaddr_in server_addr;
2 J V, x" }: \8 x; }* ^! {2 o: f - bzero(&server_addr, sizeof(server_addr)); & W% N* }2 \: l; H
- server_addr.sin_family = AF_INET;
" i1 y# [# V( [+ S/ M1 d* @
# J2 _. f$ { `4 X/ ~- // 服务器的IP地址来自程序的参数
) s; j: z1 O# U6 ~ - if (inet_aton(argv[1], &server_addr.sin_addr) == 0) 9 w/ i+ I3 @% ?
- {
1 _4 _1 r: j% O, S; u+ S - printf("Server IP Address Error!\n"); 9 G E% d3 U& i# Y4 h0 L
- exit(1);
; x6 p4 E6 S* X* J4 _ - } 5 ^4 J' v' z/ l0 m
- ! b6 l$ n1 [+ V1 `* n4 L! j9 s! T" |6 v
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
0 Y; }# q. c3 M _7 N; [: r4 Y" r - socklen_t server_addr_length = sizeof(server_addr);
- G3 f+ L2 x6 J - & W& o! P' A6 r: x& {( 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 ( \5 b4 y: n, F' ]/ H% h
- if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0) ( c+ ?) D/ w; T- d; U! H
- {
, z7 a$ u, ^- r1 R( t8 m - printf("Can Not Connect To %s!\n", argv[1]); ! n- n' x- t" C6 _
- exit(1); 4 _' k4 i+ u# U% u% D
- }
- q$ T D5 v- \$ Y: K N6 Z
4 x. ~# @( u: |( D+ K- U1 V* l: L- char file_name[FILE_NAME_MAX_SIZE + 1];
6 F( D8 Z: m. O8 _% l - bzero(file_name, sizeof(file_name));
+ Z' `3 p& R. N- ^" O - printf("Please Input File Name On Server.\t"); 2 }5 n, f2 q: N" O8 x$ g1 n
- scanf("%s", file_name); n; N1 v$ }4 }3 T; b7 ~
- * G4 u/ J4 ^' r3 C' d% Z! f8 `
- char buffer[BUFFER_SIZE]; * i. l5 h S8 S4 _
- bzero(buffer, sizeof(buffer)); ) C/ \; @$ v/ `1 I/ d) g) R
- strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name)); 3 n4 A; F& [% _( K
- // 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 x& ^) h: t7 W' e
- send(client_socket, buffer, BUFFER_SIZE, 0);
+ u( T. ]) ~1 _+ G' m* m
3 W, D: O \9 c6 x1 b" H3 J/ i% _- FILE *fp = fopen(file_name, "w"); # x B o) C9 j0 f0 G
- if (fp == NULL)
0 h# Q5 P5 [5 J( n/ N- b5 [ - { ! T4 A8 M+ l% N9 S2 g/ y3 V. S
- printf("File:\t%s Can Not Open To Write!\n", file_name);
, u$ i' i* Q1 o4 c( S* ?" w' P* q* Z - exit(1);
2 Z0 t3 B+ C# Z) L3 }4 G - } ! q# @ Y0 ^- C; ?
5 K$ B* Q2 f# ]- // 从服务器端接收数据到buffer中
5 V, H* K7 P5 F: M; A - bzero(buffer, sizeof(buffer)); : E4 r ~! ?" x/ E
- int length = 0;
0 h, L a- Y: `' I- u - while(length = recv(client_socket, buffer, BUFFER_SIZE, 0)) ; R7 V! u% ]' z( m; j
- { 2 O: Y1 Y8 |5 x0 g- X
- if (length < 0)
7 E& X+ _% P0 n. x( Q0 B; o - {
, l4 T/ ]) O* R. D - printf("Recieve Data From Server %s Failed!\n", argv[1]); * j, |: _, Y1 K8 t& x) l$ [
- break;
# o+ H' o& f5 F" R) d7 @& h; B2 V7 _ - } ' B0 N' G1 b* ?, x! y. c) R; N
y0 i" V% B* c9 b; G, O( z. ]- int write_length = fwrite(buffer, sizeof(char), length, fp);
& p4 \" A9 ~1 M9 U9 B$ U8 ~5 [ - if (write_length < length)
5 D( q+ a6 E& ^* |+ h2 v$ B; Q - {
$ b* r, n' T. t7 z' W% u: F1 `7 j - printf("File:\t%s Write Failed!\n", file_name); . [2 H/ Z" ?4 ?$ r
- break; $ s8 g7 m3 m1 q* |# K) {
- } % P1 N- K: y- f% o% |( Z
- bzero(buffer, BUFFER_SIZE); : Z; w2 W- u7 K6 |+ {
- }
, B8 O" d- \& i$ K - : }! B! r$ i& g/ \- t6 h
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]);
# W6 {3 V+ h3 }0 z+ a - $ {0 t* s% a4 \1 @. V% e$ ~
- // 传输完毕,关闭socket
! m5 |4 v3 N% q, a3 A - fclose(fp); . w& ]7 K8 r/ m
- close(client_socket);
! P$ f/ {+ C S, M - return 0;
8 v0 o5 N6 `- z - 1 l. f/ E, ^! ~: S5 J8 T$ G8 N
- }
; X" ]2 k/ E6 @8 v0 q
" T# e, Q. A/ M) _8 s, j
复制代码- /*server.c*/
; q) {/ D# C: P: d - #include<netinet/in.h>
0 r: F! Z' h5 F+ h* @1 }& O - #include<sys/types.h>' w T( a3 }. H! J# w t
- #include<sys/socket.h>
/ O( X }. W% Q/ _ - #include<stdio.h>
" n; p+ f) [: e. A3 ]) r( \5 Q u - #include<stdlib.h>
' [3 c7 x6 [' b - #include<string.h>
) J2 j, ]5 R" J7 W; e5 f4 X
. c, e) ^/ R7 U- #define HELLO_WORLD_SERVER_PORT 6666 //端口号9 y0 S% a6 R) I' o1 ~. F3 I
- #define LENGTH_OF_LISTEN_QUEUE 20! H+ U% T$ R+ _- s7 {
- #define BUFFER_SIZE 1024
O T1 r& B0 h - #define FILE_NAME_MAX_SIZE 5122 `/ M6 ]* s3 {' a& E n# B
- 1 U# v, i0 P* m$ ^* K6 d( x7 K+ Z E$ j
- int main(int argc, char **argv)6 X9 U' Q3 {5 d
- {
, w) Y" w' B1 E+ i# I: d' d. A - // set socket's address information7 @1 y3 v- |' Y2 v
- // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
7 C3 l' X4 X+ v7 y) D - struct sockaddr_in server_addr;6 H" b9 M6 @9 |. h+ O
- bzero(&server_addr, sizeof(server_addr));0 b9 l; i, X: f4 ^
- server_addr.sin_family = AF_INET;
# y. f# z& M; C) \# N4 u$ ?; k+ ~# v( y - server_addr.sin_addr.s_addr = htons(INADDR_ANY);
; n! a Q1 G3 [5 z - server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
. Z m- m0 G+ p. ]- z# W4 r* Q - 4 c6 f, p. I- z; C! m: ?4 ~
- // create a stream socket
9 H* a k- n3 x+ K- v - // 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
1 k, F0 f. e% f3 J - int server_socket = socket(PF_INET, SOCK_STREAM, 0);, a# s6 Z2 R- W& N1 d
- if (server_socket < 0)
' \0 Y- p$ A- T* X+ r) F S+ [ - {" O4 Y. K1 V1 f- v
- printf("Create Socket Failed!\n");
: a) E5 H! S2 a4 Y' k1 e - exit(1);. y9 I5 {! ^. \
- }
) z2 B- [$ W* a0 `2 n* e& B - # k C% r3 R* y$ t$ W! Y" D$ l
- // 把socket和socket地址结构绑定5 x1 B: @, n+ t/ k7 d) t" n
- if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr))). _& j2 Q1 b3 P$ K, r' j+ x
- {
+ F7 b+ } G. S/ O - printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);
V' d+ L1 c- h1 D# b+ k* v - exit(1);
- ^+ \: G- X- i) n- C+ S0 Z! m - }
, \" x u" S$ k, D1 R
- D; b: Z1 `& R" G& P/ H- // server_socket用于监听" e: f* u m" j. L. U
- if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE)) T% m! r b6 e* Y+ V4 v: W
- {
3 D' b* t3 L4 z" Z& c$ B6 y! o2 e - printf("Server Listen Failed!\n");- O; u# u! D" Y# D8 r9 h
- exit(1);
+ S7 a6 M! \- B, |3 V+ O/ ` - }
, F# S% N, f3 m; X8 ~! D
. k" F2 H3 T' D9 x R4 s- // 服务器端一直运行用以持续为客户端提供服务
% P# C7 r% ]6 v0 {3 g7 \ - while(1)# o8 n; y* t- ?- \$ K% z' H" B
- {
( v; j u% S7 J% { - // 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; ]/ t0 O( z# o2 b: P
- // 接受此请求,同时将client端的地址和端口等信息写入client_addr中
$ {; z( e: y- Y' y$ s- m - struct sockaddr_in client_addr;
9 g9 |' @* Z- |$ v7 p* R - socklen_t length = sizeof(client_addr);" B) Y3 n5 v6 i8 `6 a6 [* |
4 E9 M' o' K) I: S2 `' e- // 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$ ~$ I; ~. V/ x5 J6 o" q7 |
- // 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4 B" x" s; S* @: ~7 O' b6 u
- // 用select()来实现超时检测
5 Y( ^" i, _& N - // 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
* q1 U! m- @2 M0 t. Z0 s - // 这里的new_server_socket代表了这个通信通道. C6 U Q; \. _+ ~
- int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);! y: _1 \6 l8 {3 B
- if (new_server_socket < 0)* @1 P) M' d. n/ ^; T
- {
/ y+ G; {: r+ I h - printf("Server Accept Failed!\n");
4 ?" | J; E; `$ }9 f7 m - break;
9 D0 w$ E, U+ p* c a; E. R - }
4 z. E; r& t" n4 h* r' U% t; `
0 c7 r' v/ V" _, S8 Z- char buffer[BUFFER_SIZE];
8 F) Y+ N; Q9 t* `! O, m L - bzero(buffer, sizeof(buffer));8 ]) S, j; Q! ~# K4 x) a, x) m
- length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);, G9 f+ F2 u% |) K
- if (length < 0)' y# w2 x2 [ e$ }$ Q
- {- i" H; T' ?& U
- printf("Server Recieve Data Failed!\n");# L9 K* H4 k& W, z
- break;
7 w& @* n' J3 y9 p - }, b+ I$ p+ w; z. D6 o, {8 z* T
+ m% y7 y# Z( H( M- char file_name[FILE_NAME_MAX_SIZE + 1];- z8 J# Y I2 O4 `/ {: S- C
- bzero(file_name, sizeof(file_name));
$ s/ O3 L8 R D- T - strncpy(file_name, buffer,+ [* c! i4 W$ O* `( y5 ~; j" z4 s! O# ]
- strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));
( E1 H7 D, g* N4 `6 {
: R& g# d+ q, Z, R$ Q: Z- FILE *fp = fopen(file_name, "r");$ _1 Z! t' ~1 A, K: Y9 v
- if (fp == NULL)
# ?7 Y7 U; q; k% m - {
% b, Q/ h( L1 n - printf("File:\t%s Not Found!\n", file_name);
7 L: Y4 R! H3 ] - }
7 D' r; Z% R1 S; \ { f' R - else
2 {- J! ~7 x, C5 Y5 l* p% Z9 J8 U - {
- A- ~/ @; X& M8 J - bzero(buffer, BUFFER_SIZE);
5 G* E9 z& j% P- S5 E. K - int file_block_length = 0;# o; z1 t0 v% r+ Q7 p5 t! M
- while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
, E7 ~6 z% k5 h5 B - {
( b5 A8 v i' T( M: i1 ?. c - printf("file_block_length = %d\n", file_block_length);
- z* d+ }: F8 K* Z
* x" ?* y; s* t( v* [+ L( O- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端
5 [9 M' e6 h; E6 G - if (send(new_server_socket, buffer, file_block_length, 0) < 0)
% z- n% E' t& P# [' M( g, F# e - {
" P$ {, j, H5 z2 u5 K - printf("Send File:\t%s Failed!\n", file_name);
5 X4 s% s2 t% n - break;4 t8 g+ h% Q! }, n8 ~7 r; _6 m; G
- }7 G: o5 ~: M* W8 `7 Q K" K
% ~# |1 n% m5 [* J- bzero(buffer, sizeof(buffer));
+ G; _# P( P- c' I6 t - }; c! r4 A# N9 {6 J( J& m5 w% b* t! X
- fclose(fp);, y: M3 Z6 L1 C4 g
- printf("File:\t%s Transfer Finished!\n", file_name);
+ r1 j1 m) {& v2 U3 O - }) C4 Z* p: e2 {, \4 H& w! P
" {3 I1 ~- U+ a7 Q# m1 N- close(new_server_socket);6 K8 L% Y" B j% }
- }4 m7 [8 n" I4 A- B% `. c) D% G. I; `/ N
8 S# W m2 P- v. u! |: y/ u$ Q- close(server_socket);
! X( t' [- a& x# v) L# P - % z" K% Z9 k' D' i4 V- `9 m6 c
- return 0;
2 g3 R' k& X3 i9 c: J) | - }) J, i) Z* M8 b& G8 C1 E9 f6 U( L
7 Z9 @: l, c# ?
复制代码
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