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