release/src/router/busybox/networking/libiproute/utils.c

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