Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 | /* 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;
}
#if ENABLE_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 char ipcalc_longopts[] ALIGN1 =
"netmask\0" No_argument "m"
"broadcast\0" No_argument "b"
"network\0" No_argument "n"
# if ENABLE_FEATURE_IPCALC_FANCY
"prefix\0" No_argument "p"
"hostname\0" No_argument "h"
"silent\0" No_argument "s"
# endif
;
#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 = ipcalc_longopts;
#endif
opt = getopt32(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;
}
|