[1765] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 2 | /*
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| 3 | * Mini ipcalc implementation for busybox
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| 4 | *
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| 5 | * By Jordan Crouse <jordan@cosmicpenguin.net>
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| 6 | * Stephan Linz <linz@li-pro.net>
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| 7 | *
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| 8 | * This is a complete reimplementation of the ipcalc program
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| 9 | * from Red Hat. I didn't look at their source code, but there
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| 10 | * is no denying that this is a loving reimplementation
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| 11 | *
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| 12 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 13 | */
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| 14 |
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| 15 | #include <getopt.h>
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| 16 | #include <sys/socket.h>
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| 17 | #include <arpa/inet.h>
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| 18 |
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[1765] | 19 | #include "libbb.h"
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[821] | 20 |
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| 21 | #define CLASS_A_NETMASK ntohl(0xFF000000)
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| 22 | #define CLASS_B_NETMASK ntohl(0xFFFF0000)
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| 23 | #define CLASS_C_NETMASK ntohl(0xFFFFFF00)
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| 24 |
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| 25 | static unsigned long get_netmask(unsigned long ipaddr)
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| 26 | {
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| 27 | ipaddr = htonl(ipaddr);
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| 28 |
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| 29 | if ((ipaddr & 0xC0000000) == 0xC0000000)
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| 30 | return CLASS_C_NETMASK;
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| 31 | else if ((ipaddr & 0x80000000) == 0x80000000)
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| 32 | return CLASS_B_NETMASK;
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| 33 | else if ((ipaddr & 0x80000000) == 0)
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| 34 | return CLASS_A_NETMASK;
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| 35 | else
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| 36 | return 0;
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| 37 | }
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| 38 |
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[1765] | 39 | #if ENABLE_FEATURE_IPCALC_FANCY
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[821] | 40 | static int get_prefix(unsigned long netmask)
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| 41 | {
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| 42 | unsigned long msk = 0x80000000;
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| 43 | int ret = 0;
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| 44 |
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| 45 | netmask = htonl(netmask);
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[1765] | 46 | while (msk) {
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[821] | 47 | if (netmask & msk)
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| 48 | ret++;
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| 49 | msk >>= 1;
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| 50 | }
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| 51 | return ret;
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| 52 | }
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| 53 | #else
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| 54 | int get_prefix(unsigned long netmask);
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| 55 | #endif
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| 56 |
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[1765] | 57 |
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[821] | 58 | #define NETMASK 0x01
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| 59 | #define BROADCAST 0x02
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| 60 | #define NETWORK 0x04
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| 61 | #define NETPREFIX 0x08
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| 62 | #define HOSTNAME 0x10
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| 63 | #define SILENT 0x20
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| 64 |
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| 65 | #if ENABLE_FEATURE_IPCALC_LONG_OPTIONS
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[1765] | 66 | static const char ipcalc_longopts[] ALIGN1 =
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| 67 | "netmask\0" No_argument "m"
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| 68 | "broadcast\0" No_argument "b"
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| 69 | "network\0" No_argument "n"
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| 70 | # if ENABLE_FEATURE_IPCALC_FANCY
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| 71 | "prefix\0" No_argument "p"
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| 72 | "hostname\0" No_argument "h"
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| 73 | "silent\0" No_argument "s"
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| 74 | # endif
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| 75 | ;
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[821] | 76 | #endif
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| 77 |
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[1765] | 78 | int ipcalc_main(int argc, char **argv);
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[821] | 79 | int ipcalc_main(int argc, char **argv)
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| 80 | {
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[1765] | 81 | unsigned opt;
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[821] | 82 | int have_netmask = 0;
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| 83 | in_addr_t netmask, broadcast, network, ipaddr;
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| 84 | struct in_addr a;
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| 85 | char *ipstr;
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| 86 |
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[1765] | 87 | #if ENABLE_FEATURE_IPCALC_LONG_OPTIONS
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| 88 | applet_long_options = ipcalc_longopts;
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| 89 | #endif
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| 90 | opt = getopt32(argv, "mbn" USE_FEATURE_IPCALC_FANCY("phs"));
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[821] | 91 | argc -= optind;
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| 92 | argv += optind;
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[1765] | 93 | if (opt & (BROADCAST | NETWORK | NETPREFIX)) {
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[821] | 94 | if (argc > 2 || argc <= 0)
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| 95 | bb_show_usage();
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| 96 | } else {
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| 97 | if (argc != 1)
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| 98 | bb_show_usage();
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| 99 | }
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[1765] | 100 | if (opt & SILENT)
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| 101 | logmode = LOGMODE_NONE; /* Suppress error_msg() output */
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[821] | 102 |
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| 103 | ipstr = argv[0];
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| 104 | if (ENABLE_FEATURE_IPCALC_FANCY) {
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| 105 | unsigned long netprefix = 0;
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| 106 | char *prefixstr;
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| 107 |
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| 108 | prefixstr = ipstr;
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| 109 |
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[1765] | 110 | while (*prefixstr) {
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[821] | 111 | if (*prefixstr == '/') {
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| 112 | *prefixstr = (char)0;
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| 113 | prefixstr++;
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| 114 | if (*prefixstr) {
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[1765] | 115 | unsigned msk;
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| 116 | netprefix = xatoul_range(prefixstr, 0, 32);
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[821] | 117 | netmask = 0;
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| 118 | msk = 0x80000000;
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| 119 | while (netprefix > 0) {
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| 120 | netmask |= msk;
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| 121 | msk >>= 1;
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| 122 | netprefix--;
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| 123 | }
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| 124 | netmask = htonl(netmask);
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| 125 | /* Even if it was 0, we will signify that we have a netmask. This allows */
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| 126 | /* for specification of default routes, etc which have a 0 netmask/prefix */
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| 127 | have_netmask = 1;
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| 128 | }
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| 129 | break;
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| 130 | }
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| 131 | prefixstr++;
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| 132 | }
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| 133 | }
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| 134 | ipaddr = inet_aton(ipstr, &a);
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| 135 |
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| 136 | if (ipaddr == 0) {
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[1765] | 137 | bb_error_msg_and_die("bad IP address: %s", argv[0]);
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[821] | 138 | }
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| 139 | ipaddr = a.s_addr;
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| 140 |
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| 141 | if (argc == 2) {
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| 142 | if (ENABLE_FEATURE_IPCALC_FANCY && have_netmask) {
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[1765] | 143 | bb_error_msg_and_die("use prefix or netmask, not both");
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[821] | 144 | }
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| 145 |
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| 146 | netmask = inet_aton(argv[1], &a);
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| 147 | if (netmask == 0) {
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[1765] | 148 | bb_error_msg_and_die("bad netmask: %s", argv[1]);
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[821] | 149 | }
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| 150 | netmask = a.s_addr;
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| 151 | } else {
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| 152 |
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| 153 | /* JHC - If the netmask wasn't provided then calculate it */
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| 154 | if (!ENABLE_FEATURE_IPCALC_FANCY || !have_netmask)
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| 155 | netmask = get_netmask(ipaddr);
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| 156 | }
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| 157 |
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[1765] | 158 | if (opt & NETMASK) {
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[821] | 159 | printf("NETMASK=%s\n", inet_ntoa((*(struct in_addr *) &netmask)));
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| 160 | }
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| 161 |
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[1765] | 162 | if (opt & BROADCAST) {
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[821] | 163 | broadcast = (ipaddr & netmask) | ~netmask;
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| 164 | printf("BROADCAST=%s\n", inet_ntoa((*(struct in_addr *) &broadcast)));
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| 165 | }
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| 166 |
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[1765] | 167 | if (opt & NETWORK) {
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[821] | 168 | network = ipaddr & netmask;
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| 169 | printf("NETWORK=%s\n", inet_ntoa((*(struct in_addr *) &network)));
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| 170 | }
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| 171 |
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| 172 | if (ENABLE_FEATURE_IPCALC_FANCY) {
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[1765] | 173 | if (opt & NETPREFIX) {
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[821] | 174 | printf("PREFIX=%i\n", get_prefix(netmask));
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| 175 | }
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| 176 |
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[1765] | 177 | if (opt & HOSTNAME) {
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[821] | 178 | struct hostent *hostinfo;
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| 179 | int x;
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| 180 |
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| 181 | hostinfo = gethostbyaddr((char *) &ipaddr, sizeof(ipaddr), AF_INET);
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| 182 | if (!hostinfo) {
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[1765] | 183 | bb_herror_msg_and_die("cannot find hostname for %s", argv[0]);
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[821] | 184 | }
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| 185 | for (x = 0; hostinfo->h_name[x]; x++) {
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| 186 | hostinfo->h_name[x] = tolower(hostinfo->h_name[x]);
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| 187 | }
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| 188 |
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| 189 | printf("HOSTNAME=%s\n", hostinfo->h_name);
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| 190 | }
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| 191 | }
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| 192 |
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| 193 | return EXIT_SUCCESS;
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| 194 | }
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