release/src/router/libnfnetlink/utils/iftest.c

   1 /* simple test for index to interface name API */
   2
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <errno.h>
   7 #include <net/if.h>
   8
   9 #include <libnfnetlink/libnfnetlink.h>
  10
  11 int main(int argc, char *argv[])
  12 {
  13         int idx;
  14         struct nlif_handle *h;
  15         char name[IFNAMSIZ];
  16         unsigned int flags;
  17
  18         if (argc != 2) {
  19                 fprintf(stderr, "Usage: %s <interface>\n", argv[0]);
  20                 exit(EXIT_FAILURE);
  21         }
  22
  23         h = nlif_open();
  24         if (h == NULL) {
  25                 perror("nlif_open");
  26                 exit(EXIT_FAILURE);
  27         }
  28
  29         if (nlif_query(h) == -1) {
  30                 fprintf(stderr, "failed query to retrieve interfaces: %s\n",
  31                         strerror(errno));
  32                 exit(EXIT_FAILURE);
  33         }
  34
  35         idx = if_nametoindex(argv[1]);
  36
  37         /* Superfluous: just to make sure nlif_index2name is working fine */
  38         if (nlif_index2name(h, idx, name) == -1)
  39                 fprintf(stderr, "Cannot translate device idx=%u\n", idx);
  40
  41         if (nlif_get_ifflags(h, idx, &flags) == -1) {
  42                 fprintf(stderr, "Cannot get flags for device `%s'\n", argv[1]);
  43                 exit(EXIT_FAILURE);
  44         }
  45
  46         printf("index (%d) is %s (%s) (%s)\n", idx, argv[1],
  47                 flags & IFF_RUNNING ? "RUNNING" : "NOT RUNNING",
  48                 flags & IFF_UP ? "UP" : "DOWN");
  49
  50         nlif_close(h);
  51         return EXIT_SUCCESS;
  52 }