소스코드
Sever.c
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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define PORT_NUM 20046
#define MAXLEN 256
struct usr_data
{
char name[MAXLEN];
char buf[MAXLEN];
};
int main(int argc, char **argv)
{
int sockfd;
char *ans = "SUCCESS";
socklen_t addrlen;
struct sockaddr_in addr, cliaddr;
struct usr_data rdata;
if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
{
return 1;
}
memset((void *)&addr, 0x00, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_ANY);
addr.sin_port = htons(PORT_NUM);
addrlen = sizeof(addr);
if(bind(sockfd, (struct sockaddr *)&addr, addrlen) == -1)
{
return 1;
}
while(1)
{
addrlen = sizeof(cliaddr);
recvfrom(sockfd, (void *)&rdata, sizeof(rdata), 0, (struct sockaddr *)&cliaddr, &addrlen);
printf("Client Info : %s (Port : %d)\n", inet_ntoa(cliaddr.sin_addr), ntohs(cliaddr.sin_port));
printf("[%s] said : %s \n",rdata.name ,rdata.buf);
memset(rdata.buf, 0x00, sizeof(rdata.buf));
sscanf(ans, "%s", rdata.buf);
rdata.buf[strlen(rdata.buf)-1] = '\n';
sendto(sockfd, (void *)&rdata, sizeof(rdata), 0, (struct sockaddr *)&cliaddr, addrlen);
}
return 1;
}
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cs |
Client.c
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#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define PORT_NUM 20046
#define MAXLEN 256
struct usr_data
{
char name[256];
char buf[MAXLEN];
};
int main(int argc, char **argv)
{
int sockfd;
struct sockaddr_in addr;
struct usr_data sdata, recvaddr;
char msg[MAXLEN];
socklen_t addrlen;
if (argc != 2)
{
printf("Usage : %s [ipaddress]\n", argv[0]);
return 1;
}
if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1 )
{
return 1;
}
memset((void *)&addr, 0x00, sizeof(addr));
memset((void *)&sdata, 0x00, sizeof(sdata));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr(argv[1]);
addr.sin_port = htons(PORT_NUM);
printf("Input your name \n");
// input user name
fgets(sdata.name, MAXLEN, stdin);
sdata.name[strlen(sdata.name)-1] ='\0';
printf("If you want to quit, input \"quit\"\n");
while(1)
{
memset(sdata.buf, 0x00, MAXLEN);
printf("> ");
fgets(sdata.buf, sizeof(msg), stdin);
if(strncmp(sdata.buf, "quit\n",5) == 0){
break;
}
addrlen = sizeof(addr);
sendto(sockfd, (void *)&sdata, sizeof(sdata), 0, (struct sockaddr *)&addr, addrlen);
memset(sdata.buf, 0x00, MAXLEN);
recvfrom(sockfd, (void *)&sdata, sizeof(sdata), 0, (struct sockaddr *)&recvaddr, &addrlen);
printf("Server : %s", sdata.buf);
}
close(sockfd);
}
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cs |
실행결과
| Server | Client | ||||||
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※ 본 글은 개인 포트폴리오 혹은 공부용으로 사용하기 때문에, 무단 복사 유포는 금지하지만, 개인 공부 용도로는 얼마든지 사용하셔도 좋습니다
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