81 lines
1.5 KiB
C
81 lines
1.5 KiB
C
#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <limits.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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int main(const int argc, const char **argv) {
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unsigned int f_flag = 0;
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unsigned int d_flag = 0;
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unsigned int i_flag = 0;
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int i;
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for (i = 1; i < argc; i++) {
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if (argv[i][0] != '-')
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break;
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else if (!strcmp(argv[i], "-f"))
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f_flag = 1;
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else if (!strcmp(argv[i], "-d"))
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d_flag = 1;
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else if (!strcmp(argv[i], "-i"))
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i_flag = 1;
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else if (!strcmp(argv[i], "--help")) {
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printf("hostname [-f (Display the FQDN)] [-d (Display domainname)] [-i (Addresses for the hostname)]/ [hostname (Set new hostname)]\n");
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return 0;
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}
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}
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/* Set hostname */
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if (argc - i == 1) {
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if (sethostname(argv[argc - 1], strlen(argv[argc - 1])) < 0) {
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fprintf(stderr, "hostname: %s\n", strerror(errno));
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return 1;
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}
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return 0;
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}
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/* Get info */
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char hostname[HOST_NAME_MAX];
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if (gethostname(hostname, sizeof(hostname)) < 0) {
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fprintf(stderr, "hostname: %s\n", strerror(errno));
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return 1;
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}
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struct hostent *hp = gethostbyname(hostname);
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if (!hp) {
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fprintf(stderr, "hostname: %s\n", strerror(errno));
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return 1;
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}
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/* Print info */
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if (f_flag)
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puts(hp->h_name);
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else if (d_flag) {
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char *ptr = strchr(hp->h_name, '.');
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if (ptr)
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puts(ptr + 1);
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}
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else if (i_flag) {
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while (hp->h_addr_list[0])
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printf("%s ", inet_ntoa( *(struct in_addr *) *(hp->h_addr_list++) ));
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printf("\n");
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}
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else
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puts(hostname);
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return 0;
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}
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