[821] | 1 | /* vi: set sw=4 ts=4 ai: */
|
---|
| 2 | /*
|
---|
| 3 | * Mini ipcalc implementation for busybox
|
---|
| 4 | *
|
---|
| 5 | * By Jordan Crouse <jordan@cosmicpenguin.net>
|
---|
| 6 | * Stephan Linz <linz@li-pro.net>
|
---|
| 7 | *
|
---|
| 8 | * This is a complete reimplementation of the ipcalc program
|
---|
| 9 | * from Red Hat. I didn't look at their source code, but there
|
---|
| 10 | * is no denying that this is a loving reimplementation
|
---|
| 11 | *
|
---|
| 12 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
---|
| 13 | */
|
---|
| 14 |
|
---|
| 15 | #include "busybox.h"
|
---|
| 16 | #include <ctype.h>
|
---|
| 17 | #include <getopt.h>
|
---|
| 18 | #include <sys/socket.h>
|
---|
| 19 | #include <arpa/inet.h>
|
---|
| 20 |
|
---|
| 21 | #define IPCALC_MSG(CMD,ALTCMD) if (mode & SILENT) {ALTCMD;} else {CMD;}
|
---|
| 22 |
|
---|
| 23 | #define CLASS_A_NETMASK ntohl(0xFF000000)
|
---|
| 24 | #define CLASS_B_NETMASK ntohl(0xFFFF0000)
|
---|
| 25 | #define CLASS_C_NETMASK ntohl(0xFFFFFF00)
|
---|
| 26 |
|
---|
| 27 | static unsigned long get_netmask(unsigned long ipaddr)
|
---|
| 28 | {
|
---|
| 29 | ipaddr = htonl(ipaddr);
|
---|
| 30 |
|
---|
| 31 | if ((ipaddr & 0xC0000000) == 0xC0000000)
|
---|
| 32 | return CLASS_C_NETMASK;
|
---|
| 33 | else if ((ipaddr & 0x80000000) == 0x80000000)
|
---|
| 34 | return CLASS_B_NETMASK;
|
---|
| 35 | else if ((ipaddr & 0x80000000) == 0)
|
---|
| 36 | return CLASS_A_NETMASK;
|
---|
| 37 | else
|
---|
| 38 | return 0;
|
---|
| 39 | }
|
---|
| 40 |
|
---|
| 41 | #ifdef CONFIG_FEATURE_IPCALC_FANCY
|
---|
| 42 | static int get_prefix(unsigned long netmask)
|
---|
| 43 | {
|
---|
| 44 | unsigned long msk = 0x80000000;
|
---|
| 45 | int ret = 0;
|
---|
| 46 |
|
---|
| 47 | netmask = htonl(netmask);
|
---|
| 48 | while(msk) {
|
---|
| 49 | if (netmask & msk)
|
---|
| 50 | ret++;
|
---|
| 51 | msk >>= 1;
|
---|
| 52 | }
|
---|
| 53 | return ret;
|
---|
| 54 | }
|
---|
| 55 | #else
|
---|
| 56 | int get_prefix(unsigned long netmask);
|
---|
| 57 | #endif
|
---|
| 58 |
|
---|
| 59 | #define NETMASK 0x01
|
---|
| 60 | #define BROADCAST 0x02
|
---|
| 61 | #define NETWORK 0x04
|
---|
| 62 | #define NETPREFIX 0x08
|
---|
| 63 | #define HOSTNAME 0x10
|
---|
| 64 | #define SILENT 0x20
|
---|
| 65 |
|
---|
| 66 | #if ENABLE_FEATURE_IPCALC_LONG_OPTIONS
|
---|
| 67 | static const struct option long_options[] = {
|
---|
| 68 | {"netmask", no_argument, NULL, 'm'},
|
---|
| 69 | {"broadcast", no_argument, NULL, 'b'},
|
---|
| 70 | {"network", no_argument, NULL, 'n'},
|
---|
| 71 | #ifdef CONFIG_FEATURE_IPCALC_FANCY
|
---|
| 72 | {"prefix", no_argument, NULL, 'p'},
|
---|
| 73 | {"hostname", no_argument, NULL, 'h'},
|
---|
| 74 | {"silent", no_argument, NULL, 's'},
|
---|
| 75 | #endif
|
---|
| 76 | {NULL, 0, NULL, 0}
|
---|
| 77 | };
|
---|
| 78 | #else
|
---|
| 79 | #define long_options 0
|
---|
| 80 | #endif
|
---|
| 81 |
|
---|
| 82 |
|
---|
| 83 |
|
---|
| 84 | int ipcalc_main(int argc, char **argv)
|
---|
| 85 | {
|
---|
| 86 | unsigned long mode;
|
---|
| 87 | int have_netmask = 0;
|
---|
| 88 | in_addr_t netmask, broadcast, network, ipaddr;
|
---|
| 89 | struct in_addr a;
|
---|
| 90 | char *ipstr;
|
---|
| 91 |
|
---|
| 92 | if (ENABLE_FEATURE_IPCALC_LONG_OPTIONS)
|
---|
| 93 | bb_applet_long_options = long_options;
|
---|
| 94 |
|
---|
| 95 | mode = bb_getopt_ulflags(argc, argv, "mbn" USE_FEATURE_IPCALC_FANCY("phs"));
|
---|
| 96 |
|
---|
| 97 | argc -= optind;
|
---|
| 98 | argv += optind;
|
---|
| 99 | if (mode & (BROADCAST | NETWORK | NETPREFIX)) {
|
---|
| 100 | if (argc > 2 || argc <= 0)
|
---|
| 101 | bb_show_usage();
|
---|
| 102 | } else {
|
---|
| 103 | if (argc != 1)
|
---|
| 104 | bb_show_usage();
|
---|
| 105 | }
|
---|
| 106 |
|
---|
| 107 | ipstr = argv[0];
|
---|
| 108 | if (ENABLE_FEATURE_IPCALC_FANCY) {
|
---|
| 109 | unsigned long netprefix = 0;
|
---|
| 110 | char *prefixstr;
|
---|
| 111 |
|
---|
| 112 | prefixstr = ipstr;
|
---|
| 113 |
|
---|
| 114 | while(*prefixstr) {
|
---|
| 115 | if (*prefixstr == '/') {
|
---|
| 116 | *prefixstr = (char)0;
|
---|
| 117 | prefixstr++;
|
---|
| 118 | if (*prefixstr) {
|
---|
| 119 | unsigned int msk;
|
---|
| 120 |
|
---|
| 121 | if (safe_strtoul(prefixstr, &netprefix) || netprefix > 32) {
|
---|
| 122 | IPCALC_MSG(bb_error_msg_and_die("bad IP prefix: %s\n", prefixstr),
|
---|
| 123 | exit(EXIT_FAILURE));
|
---|
| 124 | }
|
---|
| 125 | netmask = 0;
|
---|
| 126 | msk = 0x80000000;
|
---|
| 127 | while (netprefix > 0) {
|
---|
| 128 | netmask |= msk;
|
---|
| 129 | msk >>= 1;
|
---|
| 130 | netprefix--;
|
---|
| 131 | }
|
---|
| 132 | netmask = htonl(netmask);
|
---|
| 133 | /* Even if it was 0, we will signify that we have a netmask. This allows */
|
---|
| 134 | /* for specification of default routes, etc which have a 0 netmask/prefix */
|
---|
| 135 | have_netmask = 1;
|
---|
| 136 | }
|
---|
| 137 | break;
|
---|
| 138 | }
|
---|
| 139 | prefixstr++;
|
---|
| 140 | }
|
---|
| 141 | }
|
---|
| 142 | ipaddr = inet_aton(ipstr, &a);
|
---|
| 143 |
|
---|
| 144 | if (ipaddr == 0) {
|
---|
| 145 | IPCALC_MSG(bb_error_msg_and_die("bad IP address: %s", argv[0]),
|
---|
| 146 | exit(EXIT_FAILURE));
|
---|
| 147 | }
|
---|
| 148 | ipaddr = a.s_addr;
|
---|
| 149 |
|
---|
| 150 | if (argc == 2) {
|
---|
| 151 | if (ENABLE_FEATURE_IPCALC_FANCY && have_netmask) {
|
---|
| 152 | IPCALC_MSG(bb_error_msg_and_die("Use prefix or netmask, not both.\n"),
|
---|
| 153 | exit(EXIT_FAILURE));
|
---|
| 154 | }
|
---|
| 155 |
|
---|
| 156 | netmask = inet_aton(argv[1], &a);
|
---|
| 157 | if (netmask == 0) {
|
---|
| 158 | IPCALC_MSG(bb_error_msg_and_die("bad netmask: %s", argv[1]),
|
---|
| 159 | exit(EXIT_FAILURE));
|
---|
| 160 | }
|
---|
| 161 | netmask = a.s_addr;
|
---|
| 162 | } else {
|
---|
| 163 |
|
---|
| 164 | /* JHC - If the netmask wasn't provided then calculate it */
|
---|
| 165 | if (!ENABLE_FEATURE_IPCALC_FANCY || !have_netmask)
|
---|
| 166 | netmask = get_netmask(ipaddr);
|
---|
| 167 | }
|
---|
| 168 |
|
---|
| 169 | if (mode & NETMASK) {
|
---|
| 170 | printf("NETMASK=%s\n", inet_ntoa((*(struct in_addr *) &netmask)));
|
---|
| 171 | }
|
---|
| 172 |
|
---|
| 173 | if (mode & BROADCAST) {
|
---|
| 174 | broadcast = (ipaddr & netmask) | ~netmask;
|
---|
| 175 | printf("BROADCAST=%s\n", inet_ntoa((*(struct in_addr *) &broadcast)));
|
---|
| 176 | }
|
---|
| 177 |
|
---|
| 178 | if (mode & NETWORK) {
|
---|
| 179 | network = ipaddr & netmask;
|
---|
| 180 | printf("NETWORK=%s\n", inet_ntoa((*(struct in_addr *) &network)));
|
---|
| 181 | }
|
---|
| 182 |
|
---|
| 183 | if (ENABLE_FEATURE_IPCALC_FANCY) {
|
---|
| 184 | if (mode & NETPREFIX) {
|
---|
| 185 | printf("PREFIX=%i\n", get_prefix(netmask));
|
---|
| 186 | }
|
---|
| 187 |
|
---|
| 188 | if (mode & HOSTNAME) {
|
---|
| 189 | struct hostent *hostinfo;
|
---|
| 190 | int x;
|
---|
| 191 |
|
---|
| 192 | hostinfo = gethostbyaddr((char *) &ipaddr, sizeof(ipaddr), AF_INET);
|
---|
| 193 | if (!hostinfo) {
|
---|
| 194 | IPCALC_MSG(bb_herror_msg_and_die(
|
---|
| 195 | "cannot find hostname for %s", argv[0]),);
|
---|
| 196 | exit(EXIT_FAILURE);
|
---|
| 197 | }
|
---|
| 198 | for (x = 0; hostinfo->h_name[x]; x++) {
|
---|
| 199 | hostinfo->h_name[x] = tolower(hostinfo->h_name[x]);
|
---|
| 200 | }
|
---|
| 201 |
|
---|
| 202 | printf("HOSTNAME=%s\n", hostinfo->h_name);
|
---|
| 203 | }
|
---|
| 204 | }
|
---|
| 205 |
|
---|
| 206 | return EXIT_SUCCESS;
|
---|
| 207 | }
|
---|