急：请教一个client/server的UDP通信问题，高手请进-->多谢！

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楼主贴 大中小发表于 2001-9-6 11:00 只看该作者

从网上下了这两个程序，我进行了适当的修改了，在red hat linux7.1下编译通过。& t3 r- V0 Q. H2 X
源程序如下：, l" q& y) q' [1 \
/*client_udp.c*/, s- a: o# S) f4 y. c, L2 Z- ?' a8 S
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>) T0 V( R! r& t6 u- @7 h% P
#include <stdlib.h>9 k" |8 K8 I: Z
#include <time.h>/ t- u' I5 Q0 U( B" \
#include <netinet/in.h>

#define MAX_BUF_SIZE 1024
void udpc_requ(int sockfd,const struct sockaddr *addr,int len)6 a: }7 i: }1 E8 p' M
{ 3 P0 m6 j6 X# y1 F; l
  char buffer[MAX_BUF_SIZE];
  int n; 2 t0 a- p: {$ s: h, {# L
  while(1) ( t( ^9 B7 M8 f+ Z5 |; o, n
  {
fgets(buffer,MAX_BUF_SIZE,stdin);1 {6 l9 |# f( v' c
sendto(sockfd,buffer,strlen(buffer),0,addr,len);3 P3 |3 o% O0 p1 k/ \
bzero(buffer,MAX_BUF_SIZE);
n=recvfrom(sockfd,buffer,MAX_BUF_SIZE,0,NULL,NULL);
buffer[n]=0;
fputs(buffer,stdout);5 \" y5 l, O% M, v( B+ d
}
}
1 B2 q7 c: P: c: b( B
int main(int argc,char **argv) " `8 Q) m4 e6 J2 f5 Q' j5 j
{ # C$ U9 E3 b- G
  int sockfd,port;1 a% L# p" p! ^7 Q+ B2 r
  struct sockaddr_in addr;
/*  if(argc!=3)
{ , X+ B9 L, G' \2 \( D5 F$ p
printf("\nPlease input Server IP and Server port\n");5 f0 [5 j1 c# X' r* h
exit(1);
} */
  if((port=atoi(argv[2]))<0)8 _/ q, I+ r, r( R6 Q+ b4 V
  {
printf("\npara error,Please input Server IP and Server port\n");% I# T& U5 F2 i* h3 p( S8 _# {0 ^) c
exit(1); ( V: B9 R. b# u8 S! n  Q
  }
  sockfd=socket(AF_INET,SOCK_DGRAM,0);" W  ]7 h/ L1 K
  if(sockfd<0); V/ g3 c' D5 l* `
  { 4 g& p+ R) d- e& c6 Q) y
printf("Socket Error:");
exit(1); 9 ^* F. t! t  u" Q. \/ o! a
  }

  bzero(&addr,sizeof(struct sockaddr_in));
  addr.sin_family=AF_INET;
  addr.sin_port=htons(port); 9 h4 S- s* @, W/ p3 o) Z3 R
  if(inet_aton(argv[1],&addr.sin_addr)<0)
{
printf("Ip error:");
exit(1); 9 e7 @0 g; {8 N0 ?
}8 N; N* p) @4 R! t
udpc_requ(sockfd,(struct sockaddr *)&addr,sizeof(struct sockaddr_in));2 P, L" f6 X7 U5 b  q
close(sockfd); 4 I' U$ v! e# j3 U- R
}

/*server_udp.c*// m7 X! ^9 S! }7 c4 P+ b0 I6 J" ]
#include <stdio.h>; x/ f) n% w( Z+ ?& A/ A9 J
#include <sys/types.h>+ G/ h1 Y9 F$ F0 |
#include <sys/socket.h>
#include <errno.h>
#include <stdlib.h>
#include <time.h>
#include <netinet/in.h> /* define address struct sockaddr_in */8 ?1 `1 D, |& M  a* n! r
#define SERVER_PORT 8888
#define SERVER_ADDR "202.112.0.12"
#define MAX_MSG_SIZE 1024 ! J8 X. {# G* x& y% q6 [

void udps_respon(int sockfd)3 a. m0 J4 w, W$ w
{ ) D5 S9 v1 Q/ i  q
  struct sockaddr_in serv_addr;
  int addrlen,n;
  char msg[MAX_MSG_SIZE];5 f! H+ Y5 K, y
  while(1)
  {
n=recvfrom(sockfd,msg,MAX_MSG_SIZE,0, (struct sockaddr*)&serv_addr,&addrlen);
msg[n]=0;   h/ M- _# N4 w( _- y  z" C! |7 w
fprintf(stdout,"I have received %s",msg);
sendto(sockfd,msg,n,0,(struct sockaddr*)&serv_addr,addrlen);
  }
}
( a6 C3 v( b# b
int main(void) 3 B1 R- J$ w; m0 B+ C5 F+ A( {
{
  int sockfd;
  int ret;
  struct sockaddr_in addr; 0 ~4 Z& w7 d% e  S: r+ G
  sockfd=socket(AF_INET,SOCK_DGRAM,0);
  if(sockfd<0) 5 G5 h: M. [: ?; V
  {   a1 b9 |  V+ d& ?
printf("Socket Error");$ Z6 ?2 Y6 T5 U9 s% d, G% y
exit(1);   x( W# i, o6 R3 N0 X
  } ( O* N+ a, l  [4 g; e; C% Q
  bzero(&addr,sizeof(struct sockaddr_in)); 1 j; x9 a0 }) u! m+ @% ^
  addr.sin_family=AF_INET;
  addr.sin_addr.s_addr=htonl(inet_addr(SERVER_ADDR)); 2 ]7 {+ K/ h- J- l5 L4 W
  addr.sin_port=htons(SERVER_PORT);
  ret=bind(sockfd,(struct sockaddr *)&addr,sizeof(addr));
  if(ret<0)
  {
printf("Bind Server Port Error"); - j6 R- m1 w% f- R' d! s% V
exit(1);
  } / }1 m1 @  e8 R7 q' |( m& B
  udps_respon(sockfd);1 S. l% C% b/ _2 w/ y5 @
  close(sockfd);
}

现在的问题是我不知道该怎么测试这两个程序，我用
./client_udp my-server-IP my-server-port  asdfasdfa测试client端,但是后面无论输入多少字符都不退出.在一台机器上可以测试这两个程序吗，多谢啦！2 W- h. E- G* x4 ?
( G& O9 d! W/ g( A0 X
　　　　　　

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急：请教一个client/server的UDP通信问题，高手请进--&gt;多谢！

急：请教一个client/server的UDP通信问题，高手请进-->多谢！