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/* hostname.c - Get/Set the hostname
*
* Copyright 2012 Andre Renaud <andre@bluewatersys.com>
*
* http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/hostname.html
USE_HOSTNAME(NEWTOY(hostname, ">1bdsfF:[!bdsf]", TOYFLAG_BIN))
config HOSTNAME
bool "hostname"
default y
help
usage: hostname [-bdsf] [-F FILENAME] [newname]
Get/set the current hostname.
-b Set hostname to 'localhost' if otherwise unset
-d Show DNS domain name (no host)
-f Show fully-qualified name (host+domain, FQDN)
-F Set hostname to contents of FILENAME
-s Show short host name (no domain)
*/
#define FOR_hostname
#include "toys.h"
GLOBALS(
char *F;
)
void hostname_main(void)
{
char *hostname = *toys.optargs, *dot;
struct hostent *h;
if (TT.F && (hostname = xreadfile(TT.F, 0, 0))) {
if (!*chomp(hostname)) {
if (CFG_TOYBOX_FREE) free(hostname);
if (!FLAG(b)) error_exit("empty '%s'", TT.F);
hostname = 0;
}
}
// Implement -b.
if (!hostname && FLAG(b))
if (gethostname(toybuf, sizeof(toybuf)-1) || !*toybuf)
hostname = "localhost";
// Setting?
if (hostname) {
if (sethostname(hostname, strlen(hostname)))
perror_exit("set '%s'", hostname);
return;
}
// Get the hostname.
if (gethostname(toybuf, sizeof(toybuf)-1)) perror_exit("gethostname");
// We only do the DNS lookup for -d and -f.
if (FLAG(d) || FLAG(f)) {
if (!(h = gethostbyname(toybuf))) perror_exit("gethostbyname");
snprintf(toybuf, sizeof(toybuf), "%s", h->h_name);
}
dot = strchr(toybuf, '.');
if (FLAG(s) && dot) *dot = '\0';
xputs(FLAG(d) ? dot+1 : toybuf);
}
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