test/inet/tst-ethers-line.c

   1 #include <netinet/ether.h>
   2 #include <stdio.h>
   3 #include <sys/mman.h>
   4 #include <sys/types.h>
   5 #include <sys/stat.h>
   6 #include <fcntl.h>
   7 #include <stdlib.h>
   8
   9 /* glibc 2.4 has no ETHER_FILE_NAME, host compile fails without this */
  10 #ifndef ETHER_FILE_NAME
  11 #define ETHER_FILE_NAME "/etc/ethers"
  12 #endif
  13
  14 #define ETHER_LINE_LEN 256
  15
  16 /* This test requires /etc/ethers to exist
  17  * and to have nonzero length. You should create it manually,
  18  * if it doesn't exist.
  19  */
  20
  21 int main(void)
  22 {
  23         struct ether_addr addr;
  24         char hostname[ETHER_LINE_LEN];
  25         int fd, i;
  26         const char *ethers;
  27         struct stat statb;
  28
  29         if ((fd = open(ETHER_FILE_NAME, O_RDONLY)) == -1) {
  30                 perror ("Cannot open file /etc/ethers");
  31                 exit(1);
  32         }
  33
  34         if (fstat(fd, &statb)) {
  35                 perror("Stat failed");
  36                 exit(1);
  37         }
  38         ethers = mmap(NULL, statb.st_size, PROT_READ, MAP_SHARED, fd, 0);
  39
  40         if (ethers == MAP_FAILED) {
  41                 perror("File mapping failed");
  42                 exit(1);
  43         }
  44
  45         ether_line(ethers, &addr, hostname);
  46
  47         for (i = 0; i < 6; i++) {
  48                 printf("%02x", addr.ether_addr_octet[i]);
  49                 if (i < 5)
  50                         printf(":");
  51         }
  52         printf(" %s\n", hostname);
  53
  54         return 0;
  55 }