[1765] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 2 | /*
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| 3 | * utils.c
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| 4 | *
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| 5 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 6 | *
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| 7 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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| 8 | *
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| 9 | * Changes:
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| 10 | *
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| 11 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
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| 12 | */
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| 13 |
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| 14 | #include "libbb.h"
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| 15 | #include "utils.h"
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| 16 | #include "inet_common.h"
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| 17 |
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| 18 | int get_integer(int *val, char *arg, int base)
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| 19 | {
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| 20 | long res;
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| 21 | char *ptr;
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| 22 |
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| 23 | if (!arg || !*arg)
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| 24 | return -1;
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| 25 | res = strtol(arg, &ptr, base);
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| 26 | if (!ptr || ptr == arg || *ptr || res > INT_MAX || res < INT_MIN)
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| 27 | return -1;
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| 28 | *val = res;
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| 29 | return 0;
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| 30 | }
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[1765] | 31 | //XXX: FIXME: use some libbb function instead
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[821] | 32 | int get_unsigned(unsigned *val, char *arg, int base)
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| 33 | {
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| 34 | unsigned long res;
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| 35 | char *ptr;
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| 36 |
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| 37 | if (!arg || !*arg)
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| 38 | return -1;
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| 39 | res = strtoul(arg, &ptr, base);
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| 40 | if (!ptr || ptr == arg || *ptr || res > UINT_MAX)
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| 41 | return -1;
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| 42 | *val = res;
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| 43 | return 0;
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| 44 | }
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| 45 |
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[1765] | 46 | int get_u32(uint32_t * val, char *arg, int base)
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[821] | 47 | {
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| 48 | unsigned long res;
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| 49 | char *ptr;
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| 50 |
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| 51 | if (!arg || !*arg)
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| 52 | return -1;
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| 53 | res = strtoul(arg, &ptr, base);
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| 54 | if (!ptr || ptr == arg || *ptr || res > 0xFFFFFFFFUL)
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| 55 | return -1;
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| 56 | *val = res;
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| 57 | return 0;
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| 58 | }
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| 59 |
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[1765] | 60 | int get_u16(uint16_t * val, char *arg, int base)
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[821] | 61 | {
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| 62 | unsigned long res;
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| 63 | char *ptr;
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| 64 |
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| 65 | if (!arg || !*arg)
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| 66 | return -1;
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| 67 | res = strtoul(arg, &ptr, base);
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| 68 | if (!ptr || ptr == arg || *ptr || res > 0xFFFF)
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| 69 | return -1;
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| 70 | *val = res;
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| 71 | return 0;
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| 72 | }
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| 73 |
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[1765] | 74 | int get_u8(uint8_t * val, char *arg, int base)
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[821] | 75 | {
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| 76 | unsigned long res;
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| 77 | char *ptr;
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| 78 |
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| 79 | if (!arg || !*arg)
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| 80 | return -1;
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| 81 | res = strtoul(arg, &ptr, base);
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| 82 | if (!ptr || ptr == arg || *ptr || res > 0xFF)
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| 83 | return -1;
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| 84 | *val = res;
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| 85 | return 0;
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| 86 | }
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| 87 |
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[1765] | 88 | int get_s16(int16_t * val, char *arg, int base)
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[821] | 89 | {
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| 90 | long res;
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| 91 | char *ptr;
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| 92 |
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| 93 | if (!arg || !*arg)
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| 94 | return -1;
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| 95 | res = strtol(arg, &ptr, base);
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| 96 | if (!ptr || ptr == arg || *ptr || res > 0x7FFF || res < -0x8000)
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| 97 | return -1;
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| 98 | *val = res;
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| 99 | return 0;
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| 100 | }
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| 101 |
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[1765] | 102 | int get_s8(int8_t * val, char *arg, int base)
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[821] | 103 | {
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| 104 | long res;
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| 105 | char *ptr;
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| 106 |
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| 107 | if (!arg || !*arg)
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| 108 | return -1;
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| 109 | res = strtol(arg, &ptr, base);
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| 110 | if (!ptr || ptr == arg || *ptr || res > 0x7F || res < -0x80)
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| 111 | return -1;
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| 112 | *val = res;
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| 113 | return 0;
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| 114 | }
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| 115 |
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| 116 | int get_addr_1(inet_prefix * addr, char *name, int family)
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| 117 | {
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| 118 | char *cp;
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| 119 | unsigned char *ap = (unsigned char *) addr->data;
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| 120 | int i;
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| 121 |
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| 122 | memset(addr, 0, sizeof(*addr));
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| 123 |
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[1765] | 124 | if (strcmp(name, bb_str_default) == 0 ||
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[821] | 125 | strcmp(name, "all") == 0 || strcmp(name, "any") == 0) {
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| 126 | addr->family = family;
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| 127 | addr->bytelen = (family == AF_INET6 ? 16 : 4);
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| 128 | addr->bitlen = -1;
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| 129 | return 0;
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| 130 | }
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| 131 |
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| 132 | if (strchr(name, ':')) {
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| 133 | addr->family = AF_INET6;
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| 134 | if (family != AF_UNSPEC && family != AF_INET6)
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| 135 | return -1;
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| 136 | if (inet_pton(AF_INET6, name, addr->data) <= 0)
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| 137 | return -1;
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| 138 | addr->bytelen = 16;
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| 139 | addr->bitlen = -1;
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| 140 | return 0;
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| 141 | }
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| 142 |
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| 143 | addr->family = AF_INET;
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| 144 | if (family != AF_UNSPEC && family != AF_INET)
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| 145 | return -1;
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| 146 | addr->bytelen = 4;
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| 147 | addr->bitlen = -1;
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| 148 | for (cp = name, i = 0; *cp; cp++) {
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| 149 | if (*cp <= '9' && *cp >= '0') {
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| 150 | ap[i] = 10 * ap[i] + (*cp - '0');
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| 151 | continue;
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| 152 | }
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| 153 | if (*cp == '.' && ++i <= 3)
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| 154 | continue;
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| 155 | return -1;
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| 156 | }
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| 157 | return 0;
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| 158 | }
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| 159 |
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| 160 | int get_prefix_1(inet_prefix * dst, char *arg, int family)
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| 161 | {
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| 162 | int err;
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| 163 | int plen;
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| 164 | char *slash;
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| 165 |
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| 166 | memset(dst, 0, sizeof(*dst));
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| 167 |
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[1765] | 168 | if (strcmp(arg, bb_str_default) == 0 || strcmp(arg, "any") == 0) {
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[821] | 169 | dst->family = family;
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| 170 | dst->bytelen = 0;
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| 171 | dst->bitlen = 0;
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| 172 | return 0;
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| 173 | }
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| 174 |
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| 175 | slash = strchr(arg, '/');
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| 176 | if (slash)
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[1765] | 177 | *slash = '\0';
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[821] | 178 | err = get_addr_1(dst, arg, family);
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| 179 | if (err == 0) {
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| 180 | switch (dst->family) {
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| 181 | case AF_INET6:
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| 182 | dst->bitlen = 128;
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| 183 | break;
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| 184 | default:
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| 185 | case AF_INET:
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| 186 | dst->bitlen = 32;
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| 187 | }
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| 188 | if (slash) {
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| 189 | if (get_integer(&plen, slash + 1, 0) || plen > dst->bitlen) {
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| 190 | err = -1;
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| 191 | goto done;
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| 192 | }
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| 193 | dst->bitlen = plen;
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| 194 | }
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| 195 | }
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[1765] | 196 | done:
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[821] | 197 | if (slash)
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| 198 | *slash = '/';
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| 199 | return err;
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| 200 | }
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| 201 |
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| 202 | int get_addr(inet_prefix * dst, char *arg, int family)
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| 203 | {
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| 204 | if (family == AF_PACKET) {
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[1765] | 205 | bb_error_msg_and_die("\"%s\" may be inet address, but it is not allowed in this context", arg);
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[821] | 206 | }
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| 207 | if (get_addr_1(dst, arg, family)) {
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[1765] | 208 | bb_error_msg_and_die("an inet address is expected rather than \"%s\"", 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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| 213 | int get_prefix(inet_prefix * dst, char *arg, int family)
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| 214 | {
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| 215 | if (family == AF_PACKET) {
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[1765] | 216 | bb_error_msg_and_die("\"%s\" may be inet address, but it is not allowed in this context", arg);
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[821] | 217 | }
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| 218 | if (get_prefix_1(dst, arg, family)) {
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[1765] | 219 | bb_error_msg_and_die("an inet address is expected rather than \"%s\"", arg);
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[821] | 220 | }
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| 221 | return 0;
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| 222 | }
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| 223 |
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[1765] | 224 | uint32_t get_addr32(char *name)
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[821] | 225 | {
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| 226 | inet_prefix addr;
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| 227 |
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| 228 | if (get_addr_1(&addr, name, AF_INET)) {
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| 229 | bb_error_msg_and_die("an IP address is expected rather than \"%s\"", name);
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| 230 | }
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| 231 | return addr.data[0];
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| 232 | }
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| 233 |
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| 234 | void incomplete_command(void)
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| 235 | {
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[1765] | 236 | bb_error_msg_and_die("command line is not complete, try option \"help\"");
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[821] | 237 | }
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| 238 |
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[1765] | 239 | void invarg(const char *arg, const char *opt)
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[821] | 240 | {
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[1765] | 241 | bb_error_msg_and_die(bb_msg_invalid_arg, arg, opt);
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[821] | 242 | }
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| 243 |
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[1765] | 244 | void duparg(const char *key, const char *arg)
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[821] | 245 | {
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[1765] | 246 | bb_error_msg_and_die("duplicate \"%s\": \"%s\" is the second value", key, arg);
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[821] | 247 | }
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| 248 |
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[1765] | 249 | void duparg2(const char *key, const char *arg)
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[821] | 250 | {
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[1765] | 251 | bb_error_msg_and_die("either \"%s\" is duplicate, or \"%s\" is garbage", key, arg);
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[821] | 252 | }
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| 253 |
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| 254 | int inet_addr_match(inet_prefix * a, inet_prefix * b, int bits)
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| 255 | {
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[1765] | 256 | uint32_t *a1 = a->data;
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| 257 | uint32_t *a2 = b->data;
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[821] | 258 | int words = bits >> 0x05;
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| 259 |
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| 260 | bits &= 0x1f;
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| 261 |
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| 262 | if (words)
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| 263 | if (memcmp(a1, a2, words << 2))
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| 264 | return -1;
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| 265 |
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| 266 | if (bits) {
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[1765] | 267 | uint32_t w1, w2;
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| 268 | uint32_t mask;
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[821] | 269 |
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| 270 | w1 = a1[words];
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| 271 | w2 = a2[words];
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| 272 |
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| 273 | mask = htonl((0xffffffff) << (0x20 - bits));
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| 274 |
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| 275 | if ((w1 ^ w2) & mask)
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| 276 | return 1;
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| 277 | }
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| 278 |
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| 279 | return 0;
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| 280 | }
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| 281 |
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| 282 | const char *rt_addr_n2a(int af, int ATTRIBUTE_UNUSED len,
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| 283 | void *addr, char *buf, int buflen)
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| 284 | {
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| 285 | switch (af) {
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| 286 | case AF_INET:
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| 287 | case AF_INET6:
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| 288 | return inet_ntop(af, addr, buf, buflen);
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| 289 | default:
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| 290 | return "???";
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| 291 | }
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| 292 | }
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| 293 |
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| 294 |
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| 295 | const char *format_host(int af, int len, void *addr, char *buf, int buflen)
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| 296 | {
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| 297 | #ifdef RESOLVE_HOSTNAMES
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| 298 | if (resolve_hosts) {
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| 299 | struct hostent *h_ent;
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| 300 |
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| 301 | if (len <= 0) {
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| 302 | switch (af) {
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| 303 | case AF_INET:
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| 304 | len = 4;
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| 305 | break;
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| 306 | case AF_INET6:
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| 307 | len = 16;
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| 308 | break;
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| 309 | default:;
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| 310 | }
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| 311 | }
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[1765] | 312 | if (len > 0) {
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| 313 | h_ent = gethostbyaddr(addr, len, af);
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| 314 | if (h_ent != NULL) {
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| 315 | safe_strncpy(buf, h_ent->h_name, buflen);
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| 316 | return buf;
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| 317 | }
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[821] | 318 | }
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| 319 | }
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| 320 | #endif
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| 321 | return rt_addr_n2a(af, len, addr, buf, buflen);
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| 322 | }
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