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#include <arpa/inet.h>
#include <sys/socket.h>
#include <assert.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if EMSCRIPTEN
#include <emscripten.h>
#endif
int sockfd;
void finish(int result) {
close(sockfd);
#if EMSCRIPTEN
REPORT_RESULT();
#endif
exit(result);
}
int main() {
char str[INET_ADDRSTRLEN];
struct in_addr addr;
const char *res;
int err;
// resolve the hostname ot an actual address
struct hostent *host = gethostbyname("slashdot.org");
// convert the raw address to a string
char **raw_addr_list = host->h_addr_list;
int *raw_addr = (int*)*raw_addr_list;
res = inet_ntop(host->h_addrtype, raw_addr, str, INET_ADDRSTRLEN);
assert(res);
// convert the string to an in_addr structure
err = inet_pton(AF_INET, str, &addr);
assert(err == 1);
// do a reverse lookup on the ip address
struct hostent *host1 = gethostbyaddr(&addr, sizeof(addr), host->h_addrtype);
assert(strstr(host1->h_name, "slashdot.org"));
return EXIT_SUCCESS;
}
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