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
18 */
19
main(void)20 int main(void)
21 {
22 struct ether_addr addr;
23 char hostname[ETHER_LINE_LEN];
24 int fd, i;
25 const char *ethers;
26 struct stat statb;
27
28 if ((fd = open(ETHER_FILE_NAME, O_RDONLY)) == -1) {
29 perror ("Cannot open file");
30 exit(1);
31 }
32
33 if (fstat(fd, &statb)) {
34 perror("Stat failed");
35 exit(1);
36 }
37 ethers = mmap(NULL, statb.st_size, PROT_READ, MAP_SHARED, fd, 0);
38
39 if (ethers == MAP_FAILED) {
40 perror("File mapping failed");
41 exit(1);
42 }
43
44 ether_line(ethers, &addr, hostname);
45
46 for (i = 0; i < 6; i++) {
47 printf("%02x", addr.ether_addr_octet[i]);
48 if (i < 5)
49 printf(":");
50 }
51 printf(" %s\n", hostname);
52
53 return 0;
54 }
55