- 37-
printf("%s: sending data to '%s' (IP : %s) \n", argv[0], h->h_name,
inet_ntoa(*(struct in_addr *)h->h_addr_list[0]));
remoteServAddr.sin_family = h->h_addrtype;
memcpy((char *) &remoteServAddr.sin_addr.s_addr,
h->h_addr_list[0], h->h_length);
remoteServAddr.sin_port = htons(REMOTE_SERVER_PORT);
/* socket creation */
sd = socket(AF_INET,SOCK_DGRAM,0);
if(sd<0) {
printf("%s: cannot open socket \n",argv[0]);
exit(1);
}
/* bind any port */
cliAddr.sin_family = AF_INET;
cliAddr.sin_addr.s_addr = htonl(INADDR_ANY);
cliAddr.sin_port = htons(0);
rc = bind(sd, (struct sockaddr *) &cliAddr, sizeof(cliAddr));
if(rc<0) {
printf("%s: cannot bind port\n", argv[0]);
exit(1);
}
/* send data */
for(i=2;i<argc;i++) {
rc = sendto(sd, argv[i], strlen(argv[i])+1, 0,
(struct sockaddr *) &remoteServAddr,
sizeof(remoteServAddr));
if(rc<0) {
printf("%s: cannot send data %d \n",argv[0],i-1);
close(sd);
exit(1);
}
}
return 1;
}
• Chương trình udpServer.c
/* udpServer.c */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <unistd.h> /* close() */
