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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.* N2 b, ~! d" C# K* C" m
- /*client.c*/; ]6 y- x6 G; K; g
- #include<netinet/in.h> // for sockaddr_in 2 d: D5 T0 C" C$ U# n2 F
- #include<sys/types.h> // for socket
, d" x* c- z1 u* _$ z4 J - #include<sys/socket.h> // for socket " S& ~( `9 Y) F
- #include<stdio.h> // for printf
/ n0 f3 U I$ @ - #include<stdlib.h> // for exit
- [' q8 S" B8 S) a- R( Q3 n6 a( C - #include<string.h> // for bzero
7 Z( h- Y, m! \6 i1 \( A - : M; [( V3 p$ n8 l" }( c) O
- #define HELLO_WORLD_SERVER_PORT 6666
2 H1 b4 n6 h8 c. ^1 F1 j, ~6 V - #define BUFFER_SIZE 1024 " k! y. F7 `( ^4 n5 z4 o
- #define FILE_NAME_MAX_SIZE 512 ( o4 T3 [ f# o. U
) y$ E" E0 ` `+ H6 z: \5 _- int main(int argc, char **argv)
* h7 c! o6 ]" w7 Y) t' t - { * I! v3 ~" E: R
- if (argc != 2) 9 ?- X& ?: h" a2 e- K
- { % _4 K( s; e, _! Z* E3 L7 X
- printf("Usage: ./%s ServerIPAddress\n", argv[0]);
# M; v3 Q4 y, D! ^* c - exit(1);
( ]" [( d9 h* C' p/ m& m - } * l: R2 V8 J8 @0 t" U
+ `: \ f1 h) B9 ~! Z- // 设置一个socket地址结构client_addr, 代表客户机的internet地址和端口
* i, F6 P$ E8 s7 A: O - struct sockaddr_in client_addr;
- k u0 ]! S3 K& U% w$ m: Q0 |% K - bzero(&client_addr, sizeof(client_addr)); # r' c: s8 M1 q! s. `- f# l. ~4 [
- client_addr.sin_family = AF_INET; // internet协议族
* `3 {. y/ F' \ - client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY表示自动获取本机地址 & i) w* e; p3 R( A5 N/ F9 d/ R& b8 R
- client_addr.sin_port = htons(0); // auto allocated, 让系统自动分配一个空闲端口 6 C1 ? y5 x5 F( v" B2 a
- : H0 U: n5 D o. U
- // 创建用于internet的流协议(TCP)类型socket,用client_socket代表客户端socket
! { [3 r/ X1 t/ L2 V* g - int client_socket = socket(AF_INET, SOCK_STREAM, 0);
, L @4 i0 R c - if (client_socket < 0)
D5 Q0 h! F7 m0 I - { / A- s+ o: p |4 o' z' |# Y1 _
- printf("Create Socket Failed!\n"); ?4 x: i9 b q' n' T; u0 h5 }
- exit(1);
Z' b4 U) G/ F7 ?" @8 v - } 6 E7 }* n7 r! a6 w- P2 P
- c1 x' A7 N+ N1 S- q( \' ?
- // 把客户端的socket和客户端的socket地址结构绑定
. C0 \3 t8 n2 u3 c C+ } - if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr))) 5 `7 B0 x- u& i, Z
- {
e0 F* w+ Y1 S3 G3 K6 z' V/ Q* y - printf("Client Bind Port Failed!\n"); % O( ?/ v% w- z2 q+ q
- exit(1);
v* J, D0 B* J, u* b/ k - }
0 I, V7 U! F. g& H
$ l. Z V, B; c# Y4 ?/ _3 U- // 设置一个socket地址结构server_addr,代表服务器的internet地址和端口
' D3 K+ i2 U5 D1 l; @1 T5 Z5 M5 a - struct sockaddr_in server_addr; 6 y* E" Z3 |+ d% Y8 a' |
- bzero(&server_addr, sizeof(server_addr)); # W* p% y3 D9 `5 j: |6 w! e* \
- server_addr.sin_family = AF_INET; , W$ u; w: ?& `: J: P& Z
9 f! R, W, v0 S- // 服务器的IP地址来自程序的参数 4 B6 C/ u. E. X% L/ n+ ]
- if (inet_aton(argv[1], &server_addr.sin_addr) == 0) & o1 }7 y* f7 _( z, @ B
- { : M; D$ }6 M! m
- printf("Server IP Address Error!\n");
1 E4 \. C: @& q - exit(1);
' V9 G) I5 F* b2 t$ _ - }
8 g) l8 R& r* Z3 d6 O6 M
: D. H! k2 O3 c9 V+ N6 k- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT); 8 S" X! K* l3 n: P+ W/ @
- socklen_t server_addr_length = sizeof(server_addr); 8 ^% ^! u$ f" c" \ B5 h) F9 G
- 6 M+ D& Q' M1 @+ `' U) q- s
- // 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
@1 }8 M. A0 v4 A/ \' U - if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0) 4 F" x6 [! s& q5 O$ q; r% {
- {
' _; c0 m- O. t; O3 v - printf("Can Not Connect To %s!\n", argv[1]); : P" x2 M" m- ?. Y6 Q0 h8 d; y
- exit(1); - Z# t0 i, P4 D% r! z l6 q! r
- }
/ m: Z9 z$ c0 o0 x- [ - & }- s3 U7 _. i6 T }; Q. f& O' F
- char file_name[FILE_NAME_MAX_SIZE + 1];
! T" ]) I3 V1 V7 e - bzero(file_name, sizeof(file_name)); # ^4 V, F- M: T7 h! P
- printf("Please Input File Name On Server.\t"); , f6 Y$ V& x7 ] s* p
- scanf("%s", file_name); ( U: ?* _4 N3 I3 ?/ V O0 c& N0 ~
" N. Q6 h* M3 n4 n5 X l/ w- char buffer[BUFFER_SIZE];
6 u/ q( q6 u2 c% A - bzero(buffer, sizeof(buffer)); 5 A" N" M5 K3 R0 [
- strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));
, T2 z1 z! t9 f0 d5 V3 h, ?3 W5 I; I - // 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 , O9 a" Y2 S" Q
- send(client_socket, buffer, BUFFER_SIZE, 0); 1 q# ? Y8 p- W' e+ c0 @/ C
- # G/ z" b7 j* I" W* z
- FILE *fp = fopen(file_name, "w");
# M1 E3 `0 U# O. Q - if (fp == NULL)
8 q. \& A, t1 B7 `. S6 Y - { ; }# R4 d/ O3 t9 }0 h$ _
- printf("File:\t%s Can Not Open To Write!\n", file_name);
/ F. a9 S. m4 @ - exit(1);
2 o6 c; ~: N* c3 c$ W& I) C0 n - }
. Z& H% p# A- c/ |/ c5 X. k0 K - 8 \, v0 x- W% b. C+ Y
- // 从服务器端接收数据到buffer中 , u. f1 D% P! N. a8 m
- bzero(buffer, sizeof(buffer)); 7 c6 h' ]; u9 L9 F3 n2 u# l8 T4 s
- int length = 0; ' i# D" i& c. G$ F2 o! L. ~
- while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))
9 V& Y( ~5 P+ I/ o3 y* a: j% Z - {
, c2 X. s3 @! j3 }: a( L - if (length < 0)
- T7 R8 ~; C' u* z% R) w+ { - { " D0 [( x' Z, k; g @$ k) f
- printf("Recieve Data From Server %s Failed!\n", argv[1]); q: J! ^6 l8 [# e0 S
- break;
) A7 w: D. j0 r! q1 j Y% n - } % U: p$ W/ H7 C0 L! F, \
- - L- Q6 j/ o. t" g
- int write_length = fwrite(buffer, sizeof(char), length, fp);
% I' L: h* d7 W* e0 `- p - if (write_length < length) $ L: H; @7 t. C- Z; ^8 ^
- { / [9 U/ c: R1 V% M1 l' H3 F
- printf("File:\t%s Write Failed!\n", file_name); V$ i7 w. M1 W
- break;
, a* f8 F' t" U# F - } / U: `9 W! _% b5 c; w
- bzero(buffer, BUFFER_SIZE);
7 O3 {" |7 e" _+ [1 O - }
8 _0 n& c& e1 P* j$ e - 3 r* p% p) ^1 B# G& z' h. f5 ^
- printf("Recieve File:\t %s From Server[%s] Finished!\n", file_name, argv[1]); 2 J! _6 e) `, l% ~
- " \9 _2 b) u* g% N, ~$ ^3 l
- // 传输完毕,关闭socket
, L# M. ^4 Z: E) W2 k - fclose(fp);
% T7 C; V6 M8 |/ R( U - close(client_socket); ' U: I$ ]- M% h1 A4 d; C9 c5 y$ u8 S
- return 0; # C" c* x7 x& t0 |: Q6 P
2 u8 A+ C: f# o Z2 |9 R% E- }
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! N9 A% f9 K) o" y6 I4 G6 z
复制代码- /*server.c*/
7 a% K* A5 g; o4 Q3 o+ \- B - #include<netinet/in.h>, d4 r* q3 v2 y6 d" H! U
- #include<sys/types.h>
" o( b" U" r0 s7 y) I - #include<sys/socket.h>
& l2 K( g! D$ }; p# W - #include<stdio.h>
, c/ k0 m# n8 G% \7 `$ t - #include<stdlib.h>: k8 N5 |8 y5 [% p) O$ d
- #include<string.h>
, E) ?7 O/ _0 ^7 N! s# _6 i - 5 @* Q R2 ^" j3 P/ z
- #define HELLO_WORLD_SERVER_PORT 6666 //端口号& l( Y9 M P& Q, C6 l. |1 A( g: J
- #define LENGTH_OF_LISTEN_QUEUE 209 x* H2 a' _8 l" w
- #define BUFFER_SIZE 1024$ p$ n" ]$ I3 O3 p! U+ N) q+ ^
- #define FILE_NAME_MAX_SIZE 5120 Q( g/ Z: {. v
- ; }/ W8 C- J W a- @* |/ ~
- int main(int argc, char **argv)
5 s8 m! ] ~9 T5 R - {+ ~! r' x# p* w" c& k
- // set socket's address information
7 v/ ^% i9 S1 |; q2 {/ i4 c* J! l - // 设置一个socket地址结构server_addr,代表服务器internet的地址和端口
1 v0 v; Q6 W& j - struct sockaddr_in server_addr;; X/ t: [- \ h. c- }- M- p1 o
- bzero(&server_addr, sizeof(server_addr));. n' b _ {+ ?& X- S: [) z
- server_addr.sin_family = AF_INET;- ?/ A- N" \% U' W! Q
- server_addr.sin_addr.s_addr = htons(INADDR_ANY);- s V( S' [9 z6 w
- server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
. j% h$ N u. J j" O k- \' z; E
# H! S5 F- s" B% F# k, {7 A- // create a stream socket
- m% r# K1 A6 |7 N! n7 V% n$ ] - // 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
3 x! v' R6 u7 x - int server_socket = socket(PF_INET, SOCK_STREAM, 0);
3 N8 W# T4 n" f. B - if (server_socket < 0)8 F) j& D8 w1 ]6 F6 u
- {2 @8 l, K8 d- |- W/ U$ O8 N
- printf("Create Socket Failed!\n");$ E4 q7 n( X {: k
- exit(1); B- f, p0 \. i
- }
' O0 l8 t: p$ b5 E
) X. {5 R9 Y1 N$ v# W- // 把socket和socket地址结构绑定9 P4 x% A: m/ L: N+ `
- if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
r% r, I @+ g' Z+ W% `; q) u - {7 _0 r5 x9 {8 {3 p
- printf("Server Bind Port: %d Failed!\n", HELLO_WORLD_SERVER_PORT);
9 _6 V% }' }& o$ _ c; v7 }' h$ o6 Q - exit(1);
* u2 K) j9 [8 p+ _5 n1 L2 U5 @ - }/ }6 E2 y5 l% a" t$ y
- 9 y# j- o' `8 e8 I2 m
- // server_socket用于监听3 ]4 `6 W7 L, K
- if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
/ S& c* v! [3 [# v) ^ - {
1 ?5 H: L# e* p4 d. W* C* z: ^ - printf("Server Listen Failed!\n");
- V# D8 l+ o3 v( S' j4 G1 D - exit(1);
( N( q8 a0 b: Y9 Z' Y8 z2 H - }
% E" X& ]" a' X' t2 Q" W
2 q$ X( _( s& R" |& i: [- // 服务器端一直运行用以持续为客户端提供服务+ S! |% |; M# B! ~- L) `
- while(1)- y b3 @+ q2 {3 t8 s9 C; R' \
- {4 I2 O! X/ n* A5 L1 r& c
- // 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
" S9 |2 u! p5 b8 l - // 接受此请求,同时将client端的地址和端口等信息写入client_addr中
$ t: a- O: J A2 H - struct sockaddr_in client_addr;
- B; R# s9 A# D0 K p& d - socklen_t length = sizeof(client_addr);
* O/ G$ ?! l0 A: T
2 v6 ]' ~' B7 |- // 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- h* @5 g; z( e- h& [
- // 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
8 g: V: o, p) d- k2 x - // 用select()来实现超时检测
" a: M8 ]% O7 _4 H9 o. A - // 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 [ X9 i$ Z( p) _1 x, J
- // 这里的new_server_socket代表了这个通信通道8 Y, }) _4 a' t7 o2 z, o
- int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);" \0 F. D' t/ O& c0 q: t( k
- if (new_server_socket < 0)& n* p6 |+ a1 a
- {: } Z: i; P U1 y8 Q: I: N( X
- printf("Server Accept Failed!\n");. f- l7 g, N# T6 ~- t2 W. q) O
- break;
( P9 l1 I6 C, d, N! r9 ]8 O7 l4 K' {8 r - }
" C4 r# Y9 Q1 W F# J5 v
# ^+ ?7 I. |: K" P- char buffer[BUFFER_SIZE];
# a3 |$ H9 P5 b: z3 y - bzero(buffer, sizeof(buffer));! v: R* v' X9 U$ k& O
- length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);* z! g# g; h: P! D
- if (length < 0)) P) h' b: F3 K1 w4 l
- {
1 ]' W% d9 n& W3 a- U; Z - printf("Server Recieve Data Failed!\n");
h8 l: a; @; y( { - break;
; s# `* S$ G: x" `, X - }0 _8 f' |# Y( Y4 p
- 0 c g* |/ ~* G7 }! l2 ]) h b: S
- char file_name[FILE_NAME_MAX_SIZE + 1];% {7 @3 `" A1 F& }6 \ S; f' T
- bzero(file_name, sizeof(file_name));
* [, ]5 n. |: K* D; O P - strncpy(file_name, buffer,
0 L. d0 i" Q8 x [, f5 g$ l. I - strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));
( g- a" [- {7 ?+ Q2 s) ^
' c2 }+ k/ O' d: b( o9 h- FILE *fp = fopen(file_name, "r");% H w. q7 y }" \
- if (fp == NULL)4 j9 O: G( o! u& s3 l
- {& {9 y9 x% ~+ w9 l& j5 x
- printf("File:\t%s Not Found!\n", file_name);
, r7 N4 w j2 G - }
( l3 [- U$ l0 a' ~) [9 O* b6 } - else: [+ d1 ~2 y4 \- G0 i* x. q3 \
- { g r+ b) d; G* p- e2 o% q C: J
- bzero(buffer, BUFFER_SIZE);- t5 |5 d1 ^. I) O" D8 b3 X+ N
- int file_block_length = 0;
9 ~$ d+ Z& g% ~7 x2 A$ l) k% P2 ]9 U - while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
" s% I- N- r: \! @- J - {/ P, y8 B% h5 W+ l+ b& i
- printf("file_block_length = %d\n", file_block_length);
% N4 ?5 u# c5 ^$ z3 x$ w - ; N0 J: Z( F: Z& K8 {2 X* x
- // 发送buffer中的字符串到new_server_socket,实际上就是发送给客户端% r9 N* v" w. F$ g' M' q+ @/ b
- if (send(new_server_socket, buffer, file_block_length, 0) < 0)6 z2 T, u+ \8 b3 @7 }
- {
. K& z: G5 E) `3 F! n. j - printf("Send File:\t%s Failed!\n", file_name);
7 o# ]: ]1 ^) L2 o \2 I" L/ n - break;
, @6 u# g. M8 b% T) Y8 H5 ]" s( v - }; w" U3 F t4 A4 @( N- ~
( b; _% w9 T3 E# J- bzero(buffer, sizeof(buffer));
5 {1 @% e6 ^6 O# W @ - }% D' y6 G! V5 B! o+ V6 @
- fclose(fp);, k+ m) l( h- O$ p/ U$ Y
- printf("File:\t%s Transfer Finished!\n", file_name);
G# v- G6 W9 ~+ Q! W9 ?( ` - }
" S" W1 [. X+ A) M - # |, P/ p W: v, \" ^) ?
- close(new_server_socket);
$ m7 _% E8 I1 D, | u4 R" S6 _7 g - }
4 b: a1 v: M/ U. g! [& L
0 P: ~9 X" ~" g5 Z0 K- close(server_socket);
% O, k" k! t! x1 M
( W7 w6 a- ]( D- return 0;
$ H0 B8 O4 ~: z& E c7 i - }4 T R2 D5 ^8 D% ` c
- * I8 R/ \, J1 v4 F1 B
复制代码
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