echo_server.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#define BUF_SIZE 1024
#define OPSZ 4
void error_handling(char *message);
int calculate(int opnum, int opnds[], char oprator);
int main(int argc, char *argv[])
{
int serv_sock, clnt_sock;
char opinfo[BUF_SIZE];
int result, opnd_cnt, i;
int recv_cnt, recv_len;
struct sockaddr_in serv_adr, clnt_adr;
socklen_t clnt_adr_sz;
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_adr, 0, sizeof(serv_adr));
serv_adr.sin_family=AF_INET;
serv_adr.sin_addr.s_addr=htonl(INADDR_ANY);
serv_adr.sin_port=htons(atoi(argv[1]));
if(bind(serv_sock, (struct sockaddr*)&serv_adr, sizeof(serv_adr))==-1)
error_handling("bind() error");
if(listen(serv_sock, 5)==-1)
error_handling("listen() error");
clnt_adr_sz=sizeof(clnt_adr);
for(i=0; i<5; i++)
{
opnd_cnt=0;
clnt_sock=accept(serv_sock, (struct sockaddr*)&clnt_adr, &clnt_adr_sz);
read(clnt_sock, &opnd_cnt, 1);
recv_len=0;
while((opnd_cnt*OPSZ+1)>recv_len)
{
recv_cnt=read(clnt_sock, &opinfo[recv_len], BUF_SIZE-1);
recv_len+=recv_cnt;
}
result=calculate(opnd_cnt, (int*)opinfo, opinfo[recv_len-1]);
write(clnt_sock, (char*)&result, sizeof(result));
close(clnt_sock);
}
close(serv_sock);
return 0;
}
int calculate(int opnum, int opnds[], char op)
{
int result=opnds[0], i;
switch(op)
{
case '+':
for(i=1; i<opnum; i++) result+=opnds[i];
break;
case '-':
for(i=1; i<opnum; i++) result-=opnds[i];
break;
case '*':
for(i=1; i<opnum; i++) result*=opnds[i];
break;
}
return result;
}
void error_handling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
exit(1);
}
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echo_client.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#define BUF_SIZE 1024
void error_handling(char *message);
int main(int argc, char *argv[])
{
int sock;
char message[BUF_SIZE];
int str_len, recv_len, recv_cnt;
struct sockaddr_in serv_adr;
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_adr, 0, sizeof(serv_adr));
serv_adr.sin_family=AF_INET;
serv_adr.sin_addr.s_addr=inet_addr(argv[1]);
serv_adr.sin_port=htons(atoi(argv[2]));
if(connect(sock, (struct sockaddr*)&serv_adr, sizeof(serv_adr))==-1)
error_handling("connect() error!");
else
puts("Connected...........");
while(1)
{
fputs("Input message(Q to quit): ", stdout);
fgets(message, BUF_SIZE, stdin);
if(!strcmp(message,"q\n") || !strcmp(message,"Q\n"))
break;
str_len=write(sock, message, strlen(message));
recv_len=0;
while(recv_len<str_len)
{
recv_cnt=read(sock, &message[recv_len], BUF_SIZE-1);
if(recv_cnt==-1)
error_handling("read() error!");
recv_len+=recv_cnt;
}
message[recv_len]=0;
printf("Message from server: %s", message);
}
close(sock);
return 0;
}
void error_handling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
exit(1);
}
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op_server.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#define BUF_SIZE 1024
#define OPSZ 4
void error_handling(char *message);
int calculate(int opnum, int opnds[], char oprator);
int main(int argc, char *argv[])
{
int serv_sock, clnt_sock;
char opinfo[BUF_SIZE];
int result, opnd_cnt, i;
int recv_cnt, recv_len;
struct sockaddr_in serv_adr, clnt_adr;
socklen_t clnt_adr_sz;
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_adr, 0, sizeof(serv_adr));
serv_adr.sin_family=AF_INET;
serv_adr.sin_addr.s_addr=htonl(INADDR_ANY);
serv_adr.sin_port=htons(atoi(argv[1]));
if(bind(serv_sock, (struct sockaddr*)&serv_adr, sizeof(serv_adr))==-1)
error_handling("bind() error");
if(listen(serv_sock, 5)==-1)
error_handling("listen() error");
clnt_adr_sz=sizeof(clnt_adr);
for(i=0; i<5; i++)
{
opnd_cnt=0;
clnt_sock=accept(serv_sock, (struct sockaddr*)&clnt_adr, &clnt_adr_sz);
read(clnt_sock, &opnd_cnt, 1);
recv_len=0;
while((opnd_cnt*OPSZ+1)>recv_len)
{
recv_cnt=read(clnt_sock, &opinfo[recv_len], BUF_SIZE-1);
recv_len+=recv_cnt;
}
result=calculate(opnd_cnt, (int*)opinfo, opinfo[recv_len-1]);
write(clnt_sock, (char*)&result, sizeof(result));
close(clnt_sock);
}
close(serv_sock);
return 0;
}
int calculate(int opnum, int opnds[], char op)
{
int result=opnds[0], i;
switch(op)
{
case '+':
for(i=1; i<opnum; i++) result+=opnds[i];
break;
case '-':
for(i=1; i<opnum; i++) result-=opnds[i];
break;
case '*':
for(i=1; i<opnum; i++) result*=opnds[i];
break;
}
return result;
}
void error_handling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
exit(1);
}
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op_client.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#define BUF_SIZE 1024
#define RLT_SIZE 4
#define OPSZ 4
void error_handling(char *message);
int main(int argc, char *argv[])
{
int sock;
char opmsg[BUF_SIZE];
int result, opnd_cnt, i;
struct sockaddr_in serv_adr;
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_adr, 0, sizeof(serv_adr));
serv_adr.sin_family=AF_INET;
serv_adr.sin_addr.s_addr=inet_addr(argv[1]);
serv_adr.sin_port=htons(atoi(argv[2]));
if(connect(sock, (struct sockaddr*)&serv_adr, sizeof(serv_adr))==-1)
error_handling("connect() error!");
else
puts("Connected...........");
fputs("Operand count: ", stdout);
scanf("%d", &opnd_cnt);
opmsg[0]=(char)opnd_cnt;
for(i=0; i<opnd_cnt; i++)
{
printf("Operand %d: ", i+1);
scanf("%d", (int*)&opmsg[i*OPSZ+1]);
}
fgetc(stdin);
fputs("Operator: ", stdout);
scanf("%c", &opmsg[opnd_cnt*OPSZ+1]);
write(sock, opmsg, opnd_cnt*OPSZ+2);
read(sock, &result, RLT_SIZE);
printf("Operation result: %d \n", result);
close(sock);
return 0;
}
void error_handling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
exit(1);
}
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Datagram Socket
비연결 지향형 소켓 (SOCK_DGRAM, UDP 소켓)
데이터그램 방식의 소켓 생성 : 개별적으로 주소가 쓰여진 패킷 전송시 사용
- 패킷은 전달된 순서대로 수신되지 않음
- 에러복구를 하지 않음 (즉, 신뢰성이 없음)
- 데이터그램 패킷의 크기 제한
connect 함수로 성능향상
TCP 기반에서 connect 함수 호출 시 내부 상황
bound_host1.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#define BUF_SIZE 30
void error_handling(char *message);
int main(int argc, char *argv[])
{
int sock;
char message[BUF_SIZE];
struct sockaddr_in my_adr, your_adr;
socklen_t adr_sz;
int str_len, i;
if(argc!=2){
printf("Usage : %s <port>\n", argv[0]);
exit(1);
}
sock=socket(PF_INET, SOCK_DGRAM, 0);
if(sock==-1)
error_handling("socket() error");
memset(&my_adr, 0, sizeof(my_adr));
my_adr.sin_family=AF_INET;
my_adr.sin_addr.s_addr=htonl(INADDR_ANY);
my_adr.sin_port=htons(atoi(argv[1]));
if(bind(sock, (struct sockaddr*)&my_adr, sizeof(my_adr))==-1)
error_handling("bind() error");
for(i=0; i<3; i++)
{
sleep(5); // delay 5 sec.
adr_sz=sizeof(your_adr);
str_len=recvfrom(sock, message, BUF_SIZE, 0,
(struct sockaddr*)&your_adr, &adr_sz);
printf("Message %d: %s \n", i+1, message);
}
close(sock);
return 0;
}
void error_handling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
exit(1);
}
/*
root@my_linux:/home/swyoon/tcpip# gcc bound_host1.c -o host1
root@my_linux:/home/swyoon/tcpip# ./host1
Usage : ./host1 <port>
root@my_linux:/home/swyoon/tcpip# ./host1 9190
Message 1: Hi!
Message 2: I'm another UDP host!
Message 3: Nice to meet you
root@my_linux:/home/swyoon/tcpip#
*/
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bound_host2.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#define BUF_SIZE 30
void error_handling(char *message);
int main(int argc, char *argv[])
{
int sock;
char msg1[]="Hi!";
char msg2[]="I'm another UDP host!";
char msg3[]="Nice to meet you";
struct sockaddr_in your_adr;
socklen_t your_adr_sz;
if(argc!=3){
printf("Usage : %s <IP> <port>\n", argv[0]);
exit(1);
}
sock=socket(PF_INET, SOCK_DGRAM, 0);
if(sock==-1)
error_handling("socket() error");
memset(&your_adr, 0, sizeof(your_adr));
your_adr.sin_family=AF_INET;
your_adr.sin_addr.s_addr=inet_addr(argv[1]);
your_adr.sin_port=htons(atoi(argv[2]));
sendto(sock, msg1, sizeof(msg1), 0,
(struct sockaddr*)&your_adr, sizeof(your_adr));
sendto(sock, msg2, sizeof(msg2), 0,
(struct sockaddr*)&your_adr, sizeof(your_adr));
sendto(sock, msg3, sizeof(msg3), 0,
(struct sockaddr*)&your_adr, sizeof(your_adr));
close(sock);
return 0;
}
void error_handling(char *message)
{
fputs(message, stderr);
fputc('\n', stderr);
exit(1);
}
/*
root@my_linux:/home/swyoon/tcpip# gcc bound_host2.c -o host2
root@my_linux:/home/swyoon/tcpip# ./host2
Usage : ./host2 <IP> <port>
root@my_linux:/home/swyoon/tcpip# ./host2 127.0.0.1 9190
root@my_linux:/home/swyoon/tcpip#
*/
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