[1765] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 2 | /*
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[2725] | 3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 4 | *
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[2725] | 5 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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[821] | 6 | *
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| 7 | * Changes:
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| 8 | *
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[2725] | 9 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
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[821] | 10 | */
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| 11 |
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| 12 | #include "libbb.h"
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| 13 | #include "utils.h"
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| 14 | #include "inet_common.h"
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| 15 |
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[3621] | 16 | unsigned get_hz(void)
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| 17 | {
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| 18 | static unsigned hz_internal;
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| 19 | FILE *fp;
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| 20 |
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| 21 | if (hz_internal)
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| 22 | return hz_internal;
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| 23 |
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| 24 | fp = fopen_for_read("/proc/net/psched");
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| 25 | if (fp) {
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| 26 | unsigned nom, denom;
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| 27 |
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| 28 | if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
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| 29 | if (nom == 1000000)
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| 30 | hz_internal = denom;
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| 31 | fclose(fp);
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| 32 | }
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| 33 | if (!hz_internal)
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| 34 | hz_internal = bb_clk_tck();
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| 35 | return hz_internal;
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| 36 | }
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| 37 |
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[2725] | 38 | unsigned get_unsigned(char *arg, const char *errmsg)
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[821] | 39 | {
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| 40 | unsigned long res;
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| 41 | char *ptr;
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| 42 |
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[2725] | 43 | if (*arg) {
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| 44 | res = strtoul(arg, &ptr, 0);
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| 45 | //FIXME: "" will be accepted too, is it correct?!
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| 46 | if (!*ptr && res <= UINT_MAX) {
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| 47 | return res;
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| 48 | }
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| 49 | }
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[3621] | 50 | invarg_1_to_2(arg, errmsg); /* does not return */
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[821] | 51 | }
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| 52 |
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[2725] | 53 | uint32_t get_u32(char *arg, const char *errmsg)
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[821] | 54 | {
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| 55 | unsigned long res;
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| 56 | char *ptr;
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| 57 |
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[2725] | 58 | if (*arg) {
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| 59 | res = strtoul(arg, &ptr, 0);
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| 60 | //FIXME: "" will be accepted too, is it correct?!
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| 61 | if (!*ptr && res <= 0xFFFFFFFFUL) {
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| 62 | return res;
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| 63 | }
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| 64 | }
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[3621] | 65 | invarg_1_to_2(arg, errmsg); /* does not return */
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[821] | 66 | }
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| 67 |
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[2725] | 68 | uint16_t get_u16(char *arg, const char *errmsg)
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[821] | 69 | {
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| 70 | unsigned long res;
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| 71 | char *ptr;
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| 72 |
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[2725] | 73 | if (*arg) {
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| 74 | res = strtoul(arg, &ptr, 0);
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| 75 | //FIXME: "" will be accepted too, is it correct?!
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| 76 | if (!*ptr && res <= 0xFFFF) {
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| 77 | return res;
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| 78 | }
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| 79 | }
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[3621] | 80 | invarg_1_to_2(arg, errmsg); /* does not return */
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[821] | 81 | }
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| 82 |
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[2725] | 83 | int get_addr_1(inet_prefix *addr, char *name, int family)
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[821] | 84 | {
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| 85 | memset(addr, 0, sizeof(*addr));
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| 86 |
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[2725] | 87 | if (strcmp(name, "default") == 0
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| 88 | || strcmp(name, "all") == 0
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| 89 | || strcmp(name, "any") == 0
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| 90 | ) {
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[821] | 91 | addr->family = family;
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| 92 | addr->bytelen = (family == AF_INET6 ? 16 : 4);
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| 93 | addr->bitlen = -1;
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| 94 | return 0;
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| 95 | }
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| 96 |
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| 97 | if (strchr(name, ':')) {
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| 98 | addr->family = AF_INET6;
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| 99 | if (family != AF_UNSPEC && family != AF_INET6)
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| 100 | return -1;
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| 101 | if (inet_pton(AF_INET6, name, addr->data) <= 0)
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| 102 | return -1;
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| 103 | addr->bytelen = 16;
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| 104 | addr->bitlen = -1;
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| 105 | return 0;
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| 106 | }
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| 107 |
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| 108 | if (family != AF_UNSPEC && family != AF_INET)
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| 109 | return -1;
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[3232] | 110 |
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| 111 | /* Try to parse it as IPv4 */
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| 112 | addr->family = AF_INET;
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| 113 | #if 0 /* Doesn't handle e.g. "10.10", for example, "ip r l root 10.10/16" */
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[2725] | 114 | if (inet_pton(AF_INET, name, addr->data) <= 0)
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| 115 | return -1;
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[3232] | 116 | #else
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| 117 | {
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| 118 | unsigned i = 0;
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| 119 | unsigned n = 0;
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| 120 | const char *cp = name - 1;
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| 121 | while (*++cp) {
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| 122 | if ((unsigned char)(*cp - '0') <= 9) {
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| 123 | n = 10 * n + (unsigned char)(*cp - '0');
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| 124 | if (n >= 256)
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| 125 | return -1;
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| 126 | ((uint8_t*)addr->data)[i] = n;
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| 127 | continue;
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| 128 | }
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| 129 | if (*cp == '.' && ++i <= 3) {
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| 130 | n = 0;
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| 131 | continue;
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| 132 | }
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| 133 | return -1;
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| 134 | }
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| 135 | }
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| 136 | #endif
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[821] | 137 | addr->bytelen = 4;
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| 138 | addr->bitlen = -1;
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[3232] | 139 |
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[821] | 140 | return 0;
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| 141 | }
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| 142 |
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[3232] | 143 | static void get_prefix_1(inet_prefix *dst, char *arg, int family)
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[821] | 144 | {
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| 145 | char *slash;
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| 146 |
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| 147 | memset(dst, 0, sizeof(*dst));
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| 148 |
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[2725] | 149 | if (strcmp(arg, "default") == 0
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| 150 | || strcmp(arg, "all") == 0
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| 151 | || strcmp(arg, "any") == 0
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| 152 | ) {
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[821] | 153 | dst->family = family;
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[2725] | 154 | /*dst->bytelen = 0; - done by memset */
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| 155 | /*dst->bitlen = 0;*/
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[3232] | 156 | return;
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[821] | 157 | }
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| 158 |
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| 159 | slash = strchr(arg, '/');
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| 160 | if (slash)
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[1765] | 161 | *slash = '\0';
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[3232] | 162 |
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| 163 | if (get_addr_1(dst, arg, family) == 0) {
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[2725] | 164 | dst->bitlen = (dst->family == AF_INET6) ? 128 : 32;
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[821] | 165 | if (slash) {
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[3232] | 166 | unsigned plen;
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[2725] | 167 | inet_prefix netmask_pfx;
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| 168 |
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| 169 | netmask_pfx.family = AF_UNSPEC;
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| 170 | plen = bb_strtou(slash + 1, NULL, 0);
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| 171 | if ((errno || plen > dst->bitlen)
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[3232] | 172 | && get_addr_1(&netmask_pfx, slash + 1, family) != 0
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| 173 | ) {
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| 174 | goto bad;
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| 175 | }
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| 176 | if (netmask_pfx.family == AF_INET) {
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[2725] | 177 | /* fill in prefix length of dotted quad */
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| 178 | uint32_t mask = ntohl(netmask_pfx.data[0]);
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| 179 | uint32_t host = ~mask;
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| 180 |
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| 181 | /* a valid netmask must be 2^n - 1 */
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[3232] | 182 | if (host & (host + 1))
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| 183 | goto bad;
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| 184 |
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| 185 | for (plen = 0; mask; mask <<= 1)
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| 186 | ++plen;
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| 187 | if (plen > dst->bitlen)
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| 188 | goto bad;
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| 189 | /* dst->flags |= PREFIXLEN_SPECIFIED; */
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[821] | 190 | }
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[3232] | 191 | dst->bitlen = plen;
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[821] | 192 | }
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| 193 | }
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[3232] | 194 |
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[821] | 195 | if (slash)
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| 196 | *slash = '/';
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[3232] | 197 | return;
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| 198 | bad:
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| 199 | bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "inet", "prefix", arg);
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[821] | 200 | }
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| 201 |
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[2725] | 202 | int get_addr(inet_prefix *dst, char *arg, int family)
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[821] | 203 | {
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| 204 | if (family == AF_PACKET) {
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[2725] | 205 | bb_error_msg_and_die("\"%s\" may be inet %s, but it is not allowed in this context", arg, "address");
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[821] | 206 | }
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| 207 | if (get_addr_1(dst, arg, family)) {
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[2725] | 208 | bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "inet", "address", arg);
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[821] | 209 | }
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| 210 | return 0;
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| 211 | }
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| 212 |
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[3232] | 213 | void get_prefix(inet_prefix *dst, char *arg, int family)
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[821] | 214 | {
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| 215 | if (family == AF_PACKET) {
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[2725] | 216 | bb_error_msg_and_die("\"%s\" may be inet %s, but it is not allowed in this context", arg, "prefix");
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[821] | 217 | }
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[3232] | 218 | get_prefix_1(dst, arg, family);
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[821] | 219 | }
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| 220 |
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[1765] | 221 | uint32_t get_addr32(char *name)
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[821] | 222 | {
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| 223 | inet_prefix addr;
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| 224 |
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| 225 | if (get_addr_1(&addr, name, AF_INET)) {
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[2725] | 226 | bb_error_msg_and_die("an %s %s is expected rather than \"%s\"", "IP", "address", name);
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[821] | 227 | }
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| 228 | return addr.data[0];
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| 229 | }
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| 230 |
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| 231 | void incomplete_command(void)
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| 232 | {
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[3621] | 233 | bb_error_msg_and_die("command line is not complete, try \"help\"");
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[821] | 234 | }
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| 235 |
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[3621] | 236 | void invarg_1_to_2(const char *arg, const char *opt)
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[821] | 237 | {
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[3621] | 238 | bb_error_msg_and_die(bb_msg_invalid_arg_to, arg, opt);
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[821] | 239 | }
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| 240 |
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[1765] | 241 | void duparg(const char *key, const char *arg)
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[821] | 242 | {
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[1765] | 243 | bb_error_msg_and_die("duplicate \"%s\": \"%s\" is the second value", key, arg);
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[821] | 244 | }
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| 245 |
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[1765] | 246 | void duparg2(const char *key, const char *arg)
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[821] | 247 | {
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[1765] | 248 | bb_error_msg_and_die("either \"%s\" is duplicate, or \"%s\" is garbage", key, arg);
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[821] | 249 | }
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| 250 |
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[3232] | 251 | int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits)
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[821] | 252 | {
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[3232] | 253 | const uint32_t *a1 = a->data;
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| 254 | const uint32_t *a2 = b->data;
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[2725] | 255 | int words = bits >> 5;
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[821] | 256 |
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| 257 | bits &= 0x1f;
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| 258 |
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| 259 | if (words)
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| 260 | if (memcmp(a1, a2, words << 2))
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| 261 | return -1;
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| 262 |
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| 263 | if (bits) {
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[1765] | 264 | uint32_t w1, w2;
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| 265 | uint32_t mask;
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[821] | 266 |
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| 267 | w1 = a1[words];
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| 268 | w2 = a2[words];
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| 269 |
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| 270 | mask = htonl((0xffffffff) << (0x20 - bits));
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| 271 |
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| 272 | if ((w1 ^ w2) & mask)
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| 273 | return 1;
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| 274 | }
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| 275 |
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| 276 | return 0;
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| 277 | }
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| 278 |
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[3621] | 279 | const char *rt_addr_n2a(int af, void *addr)
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[821] | 280 | {
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| 281 | switch (af) {
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| 282 | case AF_INET:
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| 283 | case AF_INET6:
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[3621] | 284 | return inet_ntop(af, addr,
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| 285 | auto_string(xzalloc(INET6_ADDRSTRLEN)), INET6_ADDRSTRLEN
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| 286 | );
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[821] | 287 | default:
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| 288 | return "???";
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| 289 | }
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| 290 | }
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| 291 |
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[2725] | 292 | #ifdef RESOLVE_HOSTNAMES
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[3621] | 293 | const char *format_host(int af, int len, void *addr)
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[821] | 294 | {
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| 295 | if (resolve_hosts) {
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| 296 | struct hostent *h_ent;
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| 297 |
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| 298 | if (len <= 0) {
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| 299 | switch (af) {
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| 300 | case AF_INET:
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| 301 | len = 4;
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| 302 | break;
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| 303 | case AF_INET6:
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| 304 | len = 16;
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| 305 | break;
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| 306 | default:;
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| 307 | }
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| 308 | }
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[1765] | 309 | if (len > 0) {
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| 310 | h_ent = gethostbyaddr(addr, len, af);
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| 311 | if (h_ent != NULL) {
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[3621] | 312 | return auto_string(xstrdup(h_ent->h_name));
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[1765] | 313 | }
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[821] | 314 | }
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| 315 | }
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[3621] | 316 | return rt_addr_n2a(af, addr);
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[2725] | 317 | }
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[821] | 318 | #endif
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