[2009/06/08] 예제소스(echo_client2.c, bnd_server.c, bnd_client.c)

/* echo_client2.c */


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>

void error_handling(char *message);

int main(int argc, char **argv)
{
 int sock;
 char message[30];
 int str_len, recv_len, recv_num;
 struct sockaddr_in serv_addr;
 
 if(argc!=3){
  printf("Usage : %s <IP> <port>\n", argv[0]);
  exit(1);
 }
 
 sock=socket(PF_INET, SOCK_STREAM, 0);  
 if(sock == -1)
  error_handling("socket() error");
 
 memset(&serv_addr, 0, sizeof(serv_addr));
 serv_addr.sin_family=AF_INET;
 serv_addr.sin_addr.s_addr=inet_addr(argv[1]);
 serv_addr.sin_port=htons(atoi(argv[2]));
 
 if( connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr))==-1 )
  error_handling("connect() error!");
 
 while(1)
 {    
  fputs("전송할 메시지를 입력 하세요 (q to quit) : ", stdout);
  fgets(message, sizeof(message), stdin);
  
  if(!strcmp(message,"q\n")) break;
  str_len=write(sock, message, strlen(message)); /* 메시지 전송 */
  
  for(recv_len=0; recv_len<str_len; ) /* 메시지 수신 */
  { 
   recv_num=read(sock, &message[recv_len], str_len-recv_len);
   if(recv_num==-1)
    error_handling("read() error!");
   recv_len+=recv_num;
  }
  message[str_len]=0;
  printf("서버로부터 전송된 메시지 : %s \n", message);
 }
 
 close(sock);
 return 0;
}

void error_handling(char *message)
{
 fputs(message, stderr);
 fputc('\n', stderr);
 exit(1);
}






/* bnd_server.c */


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>

#define BUFSIZE 100

void error_handling(char *message);

int main(int argc, char **argv)
{
 int serv_sock;
 int clnt_sock;
 char message[BUFSIZE];
 int str_len;
 
 struct sockaddr_in serv_addr;
 struct sockaddr_in clnt_addr;
 int clnt_addr_size;
 if(argc!=2){
  printf("Usage : %s <port>\n", argv[0]);
  exit(1);
 }
 
 serv_sock=socket(PF_INET, SOCK_STREAM, 0);  
 if(serv_sock == -1)
  error_handling("socket() error");
 
 memset(&serv_addr, 0, sizeof(serv_addr));
 serv_addr.sin_family=AF_INET;
 serv_addr.sin_addr.s_addr=htonl(INADDR_ANY);
 serv_addr.sin_port=htons(atoi(argv[1]));
 
 if( bind(serv_sock, (struct sockaddr*) &serv_addr, sizeof(serv_addr))==-1 )
  error_handling("bind() error");
 
 if( listen(serv_sock, 5)==-1 )
  error_handling("listen() error");
 
 clnt_addr_size=sizeof(clnt_addr);   
 clnt_sock=accept(serv_sock, (struct sockaddr*)&clnt_addr,&clnt_addr_size);
 if(clnt_sock==-1)
  error_handling("accept() error");
 
 sleep(5);
 str_len=read(clnt_sock, message, BUFSIZE); /* 메시지 수신 */
 write(clnt_sock, message, str_len);   /* 메시지 전송 */
 
 close(clnt_sock);
 return 0;
}






/* echo_client2.c */


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>

void error_handling(char *message);

int main(int argc, char **argv)
{
 int sock;
 char message[30];
 int str_len, recv_len, recv_num;
 struct sockaddr_in serv_addr;
 
 if(argc!=3){
  printf("Usage : %s <IP> <port>\n", argv[0]);
  exit(1);
 }
 
 sock=socket(PF_INET, SOCK_STREAM, 0);  
 if(sock == -1)
  error_handling("socket() error");
 
 memset(&serv_addr, 0, sizeof(serv_addr));
 serv_addr.sin_family=AF_INET;
 serv_addr.sin_addr.s_addr=inet_addr(argv[1]);
 serv_addr.sin_port=htons(atoi(argv[2]));
 
 if( connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr))==-1 )
  error_handling("connect() error!");
 
 while(1)
 {    
  fputs("전송할 메시지를 입력 하세요 (q to quit) : ", stdout);
  fgets(message, sizeof(message), stdin);
  
  if(!strcmp(message,"q\n")) break;
  str_len=write(sock, message, strlen(message)); /* 메시지 전송 */
  
  for(recv_len=0; recv_len<str_len; ) /* 메시지 수신 */
  { 
   recv_num=read(sock, &message[recv_len], str_len-recv_len);
   if(recv_num==-1)
    error_handling("read() error!");
   recv_len+=recv_num;
  }
  message[str_len]=0;
  printf("서버로부터 전송된 메시지 : %s \n", message);
 }
 
 close(sock);
 return 0;
}

void error_handling(char *message)
{
 fputs(message, stderr);
 fputc('\n', stderr);
 exit(1);
}