mirror of
https://github.com/sheumann/hush.git
synced 2024-08-20 04:28:57 +00:00
196 lines
4.5 KiB
C
196 lines
4.5 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini ipcalc implementation for busybox
|
|
*
|
|
* By Jordan Crouse <jordan@cosmicpenguin.net>
|
|
* Stephan Linz <linz@li-pro.net>
|
|
*
|
|
* This is a complete reimplementation of the ipcalc program
|
|
* from Red Hat. I didn't look at their source code, but there
|
|
* is no denying that this is a loving reimplementation
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|
*/
|
|
|
|
#include <getopt.h>
|
|
#include <sys/socket.h>
|
|
#include <arpa/inet.h>
|
|
|
|
#include "libbb.h"
|
|
|
|
#define CLASS_A_NETMASK ntohl(0xFF000000)
|
|
#define CLASS_B_NETMASK ntohl(0xFFFF0000)
|
|
#define CLASS_C_NETMASK ntohl(0xFFFFFF00)
|
|
|
|
static unsigned long get_netmask(unsigned long ipaddr)
|
|
{
|
|
ipaddr = htonl(ipaddr);
|
|
|
|
if ((ipaddr & 0xC0000000) == 0xC0000000)
|
|
return CLASS_C_NETMASK;
|
|
else if ((ipaddr & 0x80000000) == 0x80000000)
|
|
return CLASS_B_NETMASK;
|
|
else if ((ipaddr & 0x80000000) == 0)
|
|
return CLASS_A_NETMASK;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_FEATURE_IPCALC_FANCY
|
|
static int get_prefix(unsigned long netmask)
|
|
{
|
|
unsigned long msk = 0x80000000;
|
|
int ret = 0;
|
|
|
|
netmask = htonl(netmask);
|
|
while (msk) {
|
|
if (netmask & msk)
|
|
ret++;
|
|
msk >>= 1;
|
|
}
|
|
return ret;
|
|
}
|
|
#else
|
|
int get_prefix(unsigned long netmask);
|
|
#endif
|
|
|
|
|
|
#define NETMASK 0x01
|
|
#define BROADCAST 0x02
|
|
#define NETWORK 0x04
|
|
#define NETPREFIX 0x08
|
|
#define HOSTNAME 0x10
|
|
#define SILENT 0x20
|
|
|
|
#if ENABLE_FEATURE_IPCALC_LONG_OPTIONS
|
|
static const struct option long_options[] = {
|
|
{ "netmask", no_argument, NULL, 'm' },
|
|
{ "broadcast", no_argument, NULL, 'b' },
|
|
{ "network", no_argument, NULL, 'n' },
|
|
# if ENABLE_FEATURE_IPCALC_FANCY
|
|
{ "prefix", no_argument, NULL, 'p' },
|
|
{ "hostname", no_argument, NULL, 'h' },
|
|
{ "silent", no_argument, NULL, 's' },
|
|
# endif
|
|
{ NULL, 0, NULL, 0 }
|
|
};
|
|
#endif
|
|
|
|
int ipcalc_main(int argc, char **argv);
|
|
int ipcalc_main(int argc, char **argv)
|
|
{
|
|
unsigned opt;
|
|
int have_netmask = 0;
|
|
in_addr_t netmask, broadcast, network, ipaddr;
|
|
struct in_addr a;
|
|
char *ipstr;
|
|
|
|
#if ENABLE_FEATURE_IPCALC_LONG_OPTIONS
|
|
applet_long_options = long_options;
|
|
#endif
|
|
opt = getopt32(argc, argv, "mbn" USE_FEATURE_IPCALC_FANCY("phs"));
|
|
argc -= optind;
|
|
argv += optind;
|
|
if (opt & (BROADCAST | NETWORK | NETPREFIX)) {
|
|
if (argc > 2 || argc <= 0)
|
|
bb_show_usage();
|
|
} else {
|
|
if (argc != 1)
|
|
bb_show_usage();
|
|
}
|
|
if (opt & SILENT)
|
|
logmode = LOGMODE_NONE; /* Suppress error_msg() output */
|
|
|
|
ipstr = argv[0];
|
|
if (ENABLE_FEATURE_IPCALC_FANCY) {
|
|
unsigned long netprefix = 0;
|
|
char *prefixstr;
|
|
|
|
prefixstr = ipstr;
|
|
|
|
while (*prefixstr) {
|
|
if (*prefixstr == '/') {
|
|
*prefixstr = (char)0;
|
|
prefixstr++;
|
|
if (*prefixstr) {
|
|
unsigned msk;
|
|
netprefix = xatoul_range(prefixstr, 0, 32);
|
|
netmask = 0;
|
|
msk = 0x80000000;
|
|
while (netprefix > 0) {
|
|
netmask |= msk;
|
|
msk >>= 1;
|
|
netprefix--;
|
|
}
|
|
netmask = htonl(netmask);
|
|
/* Even if it was 0, we will signify that we have a netmask. This allows */
|
|
/* for specification of default routes, etc which have a 0 netmask/prefix */
|
|
have_netmask = 1;
|
|
}
|
|
break;
|
|
}
|
|
prefixstr++;
|
|
}
|
|
}
|
|
ipaddr = inet_aton(ipstr, &a);
|
|
|
|
if (ipaddr == 0) {
|
|
bb_error_msg_and_die("bad IP address: %s", argv[0]);
|
|
}
|
|
ipaddr = a.s_addr;
|
|
|
|
if (argc == 2) {
|
|
if (ENABLE_FEATURE_IPCALC_FANCY && have_netmask) {
|
|
bb_error_msg_and_die("use prefix or netmask, not both");
|
|
}
|
|
|
|
netmask = inet_aton(argv[1], &a);
|
|
if (netmask == 0) {
|
|
bb_error_msg_and_die("bad netmask: %s", argv[1]);
|
|
}
|
|
netmask = a.s_addr;
|
|
} else {
|
|
|
|
/* JHC - If the netmask wasn't provided then calculate it */
|
|
if (!ENABLE_FEATURE_IPCALC_FANCY || !have_netmask)
|
|
netmask = get_netmask(ipaddr);
|
|
}
|
|
|
|
if (opt & NETMASK) {
|
|
printf("NETMASK=%s\n", inet_ntoa((*(struct in_addr *) &netmask)));
|
|
}
|
|
|
|
if (opt & BROADCAST) {
|
|
broadcast = (ipaddr & netmask) | ~netmask;
|
|
printf("BROADCAST=%s\n", inet_ntoa((*(struct in_addr *) &broadcast)));
|
|
}
|
|
|
|
if (opt & NETWORK) {
|
|
network = ipaddr & netmask;
|
|
printf("NETWORK=%s\n", inet_ntoa((*(struct in_addr *) &network)));
|
|
}
|
|
|
|
if (ENABLE_FEATURE_IPCALC_FANCY) {
|
|
if (opt & NETPREFIX) {
|
|
printf("PREFIX=%i\n", get_prefix(netmask));
|
|
}
|
|
|
|
if (opt & HOSTNAME) {
|
|
struct hostent *hostinfo;
|
|
int x;
|
|
|
|
hostinfo = gethostbyaddr((char *) &ipaddr, sizeof(ipaddr), AF_INET);
|
|
if (!hostinfo) {
|
|
bb_herror_msg_and_die("cannot find hostname for %s", argv[0]);
|
|
}
|
|
for (x = 0; hostinfo->h_name[x]; x++) {
|
|
hostinfo->h_name[x] = tolower(hostinfo->h_name[x]);
|
|
}
|
|
|
|
printf("HOSTNAME=%s\n", hostinfo->h_name);
|
|
}
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|