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/*
* trygetif.c - test program for getif.c
*/
#include <sys/types.h>
#include <sys/socket.h>
#if defined(SUNOS) || defined(SVR4)
#include <sys/sockio.h>
#endif
#include <net/if.h> /* for struct ifreq */
#include <netinet/in.h>
#include <arpa/inet.h> /* inet_ntoa */
#include <netdb.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include "getif.h"
int debug = 0;
char *progname;
int
main(int argc, char *argv[])
{
struct hostent *hep;
struct sockaddr ea; /* Ethernet address */
struct sockaddr_in *sip; /* Interface address */
struct ifreq *ifr;
struct in_addr dst_addr;
struct in_addr *dap;
int i, s;
progname = argv[0]; /* for report */
dap = NULL;
if (argc > 1) {
dap = &dst_addr;
if (inet_aton(argv[1], &dst_addr) == 0) {
hep = gethostbyname(argv[1]);
if (!hep) {
printf("gethostbyname(%s)\n", argv[1]);
exit(1);
}
memcpy(&dst_addr, hep->h_addr, sizeof(dst_addr));
}
}
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0) {
perror("socket open");
exit(1);
}
ifr = getif(s, dap);
if (!ifr) {
printf("no interface for address\n");
exit(1);
}
printf("Intf-name:%s\n", ifr->ifr_name);
sip = (struct sockaddr_in *) &(ifr->ifr_addr);
printf("Intf-addr:%s\n", inet_ntoa(sip->sin_addr));
exit(0);
}
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