i need help converting hostname to ip and inserting to sockaddr_in->sin_addr to be able assign to char. For example i input: localhost and it gives me 127.0.0.1
I found code, but i dont know why it gives me wrong numbers
//---
#include <sys/types.h>
#include <netinet/in.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <time.h>
#include <sys/fcntl.h>
#include <netdb.h>
//---
///CZY WPISANO HOST
struct in_addr inaddr;
inaddr.s_addr = inet_addr(argv[1]);
if( inaddr.s_addr == INADDR_NONE) //if sHost is name and not IP
{
struct hostent* phostent = gethostbyname( argv[1]);
if( phostent == 0)
bail("gethostbyname()");
if( sizeof(inaddr) != phostent->h_length)
bail("problem z inaddr"); // error something wrong,
puts(argv[1]);
inaddr.s_addr = *((unsigned long*) phostent->h_addr);
//strdup( inet_ntoa(inaddr));
srvr_addr = inet_ntoa(adr_srvr.sin_addr);
puts(srvr_addr);
}
I also wrote own code but i dont know how transfer from sockaddr to sockaddr_in data:
///CZY WPISANO HOST
if(argv[1][0]>=(char)'a' && argv[1][0]<=(char)'Z')
{
struct hostent *hent;
hent = gethostbyname(argv[1]);
adr_srvr.sin_addr = (struct in_addr*)hent->h_addr_list;
}
adr_srvr is a char* type
I really need help, thanks!
Try something like this:
struct hostent *he;
struct sockaddr_in server;
int socket;
const char hostname[] = "localhost";
/* resolve hostname */
if ( (he = gethostbyname(hostname) ) == NULL ) {
exit(1); /* error */
}
/* copy the network address to sockaddr_in structure */
memcpy(&server.sin_addr, he->h_addr_list[0], he->h_length);
server.sin_family = AF_INET;
server.sin_port = htons(1337);
/* and now you can connect */
if ( connect(socket, (struct sockaddr *)&server, sizeof(server) ) {
exit(1); /* error */
}
I wrote this code straight from my memory so I cannot guarantee that it works but I am pretty sure it should be OK.