coolx.net 문학중년

Programming

No.

143

Name.

swindler

Subject.

UNIX Networking (socket, address, write, read)

Main Cate.

C/C++

Sub Cate.

Date.

2005-07-06 11:13

Hit.

3527 (211.109....)

File.

각종 함수를 정리한다.

1) Domain Name으로 IP 얻기

struct hostent *host;
struct in_addr *addr;
char Domain[MAX]="www.swindler.net";

host=gethostbyname(Domain);
addr=(struct in_addr *) *host->h_addr_list;
HOST=addr->s_addr;
PORT=htons((long int) 80);
strcpy(temp_buf,inet_inet_ntoa((struct in_addr) *addr));

temp_buf -> 147.46.232.177
HOST -> ip어드레스가 반대 순서로 16진수 8자리로 구성된 long int

2) 접속하기

int sock;
int connected;
struct sockaddr_in address;

memset((char *)&address,0,sizeof(address));
address.sin_family = AF_INET;
address.sin_port = PORT;
address.sin_addr.s_addr=HOST;

sock=socket(AF_INET,SOCK_STREAM,0);
connected=connect(sock, (struct sockaddr *) & address, sizeof(address));

connectec<0, sock>0 이면 close(sock);

3) 보내고 받기
write(sock, command, strlen(command));
// command : GET / message RFC822
read(sock, buffer, MAX);

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