sbin/ifconfig/util.c

   1 /*      $NetBSD: util.c,v 1.17 2013/10/19 00:35:30 christos Exp $       */
   2
   3 /*-
   4  * Copyright (c) 2008 David Young.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 #ifndef lint
  30 __RCSID("$NetBSD: util.c,v 1.17 2013/10/19 00:35:30 christos Exp $");
  31 #endif /* not lint */
  32
  33 #include <ctype.h>
  34 #include <err.h>
  35 #include <errno.h>
  36 #include <netdb.h>
  37 #include <stddef.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42 #include <util.h>
  43
  44 #include <sys/param.h>
  45 #include <sys/types.h>
  46 #include <sys/socket.h>
  47 #include <ifaddrs.h>
  48
  49 #include <sys/ioctl.h>
  50 #include <net/if.h>
  51 #include <net/if_dl.h>
  52 #include <netinet/in.h>         /* XXX */
  53
  54 #include "env.h"
  55 #include "extern.h"
  56 #include "util.h"
  57 #include "prog_ops.h"
  58
  59 int
  60 getsock(int naf)
  61 {
  62         static int oaf = -1, s;
  63
  64         if (oaf == naf || (oaf != -1 && naf == AF_UNSPEC))
  65                 return s;
  66
  67         if (oaf != -1)
  68                 prog_close(s);
  69
  70         if (naf == AF_UNSPEC)
  71                 naf = AF_INET;
  72
  73         s = prog_socket(naf, SOCK_DGRAM, 0);
  74         if (s == -1)
  75                 oaf = -1;
  76         else
  77                 oaf = naf;
  78         return s;
  79 }
  80
  81 const char *
  82 get_string(const char *val, const char *sep, u_int8_t *buf, int *lenp,
  83     bool hexok)
  84 {
  85         int len;
  86         bool hexstr;
  87         u_int8_t *p;
  88
  89         len = *lenp;
  90         p = buf;
  91         hexstr = hexok && val[0] == '0' && tolower((u_char)val[1]) == 'x';
  92         if (hexstr)
  93                 val += 2;
  94         for (;;) {
  95                 if (*val == '\0')
  96                         break;
  97                 if (sep != NULL && strchr(sep, *val) != NULL) {
  98                         val++;
  99                         break;
 100                 }
 101                 if (hexstr) {
 102                         if (!isxdigit((u_char)val[0]) ||
 103                             !isxdigit((u_char)val[1])) {
 104                                 warnx("bad hexadecimal digits");
 105                                 return NULL;
 106                         }
 107                 }
 108                 if (p >= buf + len) {
 109                         if (hexstr)
 110                                 warnx("hexadecimal digits too long");
 111                         else
 112                                 warnx("strings too long");
 113                         return NULL;
 114                 }
 115                 if (hexstr) {
 116 #define tohex(x)        (isdigit(x) ? (x) - '0' : tolower(x) - 'a' + 10)
 117                         *p++ = (tohex((u_char)val[0]) << 4) |
 118                             tohex((u_char)val[1]);
 119 #undef tohex
 120                         val += 2;
 121                 } else
 122                         *p++ = *val++;
 123         }
 124         len = p - buf;
 125         if (len < *lenp)
 126                 memset(p, 0, *lenp - len);
 127         *lenp = len;
 128         return val;
 129 }
 130
 131 void
 132 print_string(const u_int8_t *buf, int len)
 133 {
 134         int i;
 135         bool hasspc;
 136
 137         i = 0;
 138         hasspc = false;
 139         if (len < 2 || buf[0] != '0' || tolower(buf[1]) != 'x') {
 140                 for (; i < len; i++) {
 141                         if (!isprint(buf[i]))
 142                                 break;
 143                         if (isspace(buf[i]))
 144                                 hasspc = true;
 145                 }
 146         }
 147         if (i == len) {
 148                 if (hasspc || len == 0)
 149                         printf("\"%.*s\"", len, buf);
 150                 else
 151                         printf("%.*s", len, buf);
 152         } else {
 153                 printf("0x");
 154                 for (i = 0; i < len; i++)
 155                         printf("%02x", buf[i]);
 156         }
 157 }
 158
 159 struct paddr_prefix *
 160 prefixlen_to_mask(int af, int plen)
 161 {
 162         union {
 163                 struct sockaddr sa;
 164                 struct sockaddr_in sin;
 165                 struct sockaddr_in6 sin6;
 166         } u;
 167         struct paddr_prefix *pfx;
 168         size_t addrlen;
 169         uint8_t *addr;
 170         int nbit;
 171
 172         memset(&u, 0, sizeof(u));
 173
 174         switch (af) {
 175         case AF_INET:
 176                 addrlen = sizeof(u.sin.sin_addr);
 177                 addr = (uint8_t *)&u.sin.sin_addr;
 178                 u.sa.sa_len = sizeof(u.sin);
 179                 break;
 180         case AF_INET6:
 181                 addrlen = sizeof(u.sin6.sin6_addr);
 182                 addr = (uint8_t *)&u.sin6.sin6_addr;
 183                 u.sa.sa_len = sizeof(u.sin6);
 184                 break;
 185         default:
 186                 errno = EINVAL;
 187                 return NULL;
 188         }
 189         u.sa.sa_family = af;
 190
 191         if (plen < 0 || (size_t)plen > addrlen * NBBY) {
 192                 errno = EINVAL;
 193                 return NULL;
 194         }
 195
 196         if (plen == 0)
 197                 plen = addrlen * NBBY;
 198
 199         memset(addr, 0xff, (plen + NBBY - 1) / NBBY);
 200
 201         nbit = plen % NBBY;
 202         if (nbit != 0)
 203                 addr[plen / NBBY] &= ~((uint8_t)0xff >> nbit);
 204         pfx = malloc(offsetof(struct paddr_prefix, pfx_addr) + u.sa.sa_len);
 205         if (pfx == NULL)
 206                 return NULL;
 207         pfx->pfx_len = plen;
 208         memcpy(&pfx->pfx_addr, &u.sa, u.sa.sa_len);
 209
 210         return pfx;
 211 }
 212
 213 int
 214 direct_ioctl(prop_dictionary_t env, unsigned long cmd, void *data)
 215 {
 216         const char *ifname;
 217         int s;
 218
 219         if ((s = getsock(AF_UNSPEC)) == -1)
 220                 err(EXIT_FAILURE, "getsock");
 221
 222         if ((ifname = getifname(env)) == NULL)
 223                 err(EXIT_FAILURE, "getifname");
 224
 225         estrlcpy(data, ifname, IFNAMSIZ);
 226
 227         return prog_ioctl(s, cmd, data);
 228 }
 229
 230 int
 231 indirect_ioctl(prop_dictionary_t env, unsigned long cmd, void *data)
 232 {
 233         struct ifreq ifr;
 234
 235         memset(&ifr, 0, sizeof(ifr));
 236
 237         ifr.ifr_data = data;
 238
 239         return direct_ioctl(env, cmd, &ifr);
 240 }
 241
 242 void
 243 print_link_addresses(prop_dictionary_t env, bool print_active_only)
 244 {
 245         char hbuf[NI_MAXHOST];
 246         const char *ifname;
 247         int s;
 248         struct ifaddrs *ifa, *ifap;
 249         const struct sockaddr_dl *sdl;
 250         struct if_laddrreq iflr;
 251
 252         if ((ifname = getifname(env)) == NULL)
 253                 err(EXIT_FAILURE, "%s: getifname", __func__);
 254
 255         if ((s = getsock(AF_LINK)) == -1)
 256                 err(EXIT_FAILURE, "%s: getsock", __func__);
 257
 258         if (getifaddrs(&ifap) == -1)
 259                 err(EXIT_FAILURE, "%s: getifaddrs", __func__);
 260
 261         memset(&iflr, 0, sizeof(iflr));
 262
 263         strlcpy(iflr.iflr_name, ifname, sizeof(iflr.iflr_name));
 264
 265         for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
 266                 if (strcmp(ifname, ifa->ifa_name) != 0)
 267                         continue;
 268                 if (ifa->ifa_addr->sa_family != AF_LINK)
 269                         continue;
 270
 271                 sdl = satocsdl(ifa->ifa_addr);
 272
 273                 memcpy(&iflr.addr, ifa->ifa_addr, MIN(ifa->ifa_addr->sa_len,
 274                     sizeof(iflr.addr)));
 275                 iflr.flags = IFLR_PREFIX;
 276                 iflr.prefixlen = sdl->sdl_alen * NBBY;
 277
 278                 if (prog_ioctl(s, SIOCGLIFADDR, &iflr) == -1)
 279                         err(EXIT_FAILURE, "%s: ioctl", __func__);
 280
 281                 if (((iflr.flags & IFLR_ACTIVE) != 0) != print_active_only)
 282                         continue;
 283
 284                 if (getnameinfo(ifa->ifa_addr, ifa->ifa_addr->sa_len,
 285                         hbuf, sizeof(hbuf), NULL, 0,
 286                         Nflag ? 0 : NI_NUMERICHOST) == 0 &&
 287                     hbuf[0] != '\0') {
 288                         printf("\t%s %s\n",
 289                             print_active_only ? "address:" : "link", hbuf);
 290                 }
 291         }
 292         freeifaddrs(ifap);
 293 }
 294
 295 int16_t
 296 ifa_get_preference(const char *ifname, const struct sockaddr *sa)
 297 {
 298         struct if_addrprefreq ifap;
 299         int s;
 300
 301         if ((s = getsock(sa->sa_family)) == -1) {
 302                 if (errno == EPROTONOSUPPORT)
 303                         return 0;
 304                 err(EXIT_FAILURE, "socket");
 305         }
 306         memset(&ifap, 0, sizeof(ifap));
 307         estrlcpy(ifap.ifap_name, ifname, sizeof(ifap.ifap_name));
 308         memcpy(&ifap.ifap_addr, sa, MIN(sizeof(ifap.ifap_addr), sa->sa_len));
 309         if (prog_ioctl(s, SIOCGIFADDRPREF, &ifap) == -1) {
 310                 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT)
 311                         return 0;
 312                 warn("SIOCGIFADDRPREF");
 313         }
 314         return ifap.ifap_preference;
 315 }
 316
 317 void
 318 ifa_print_preference(const char *ifname, const struct sockaddr *sa)
 319 {
 320         int16_t preference;
 321
 322         if (lflag)
 323                 return;
 324
 325         preference = ifa_get_preference(ifname, sa);
 326         printf(" preference %" PRId16, preference);
 327 }
 328
 329 bool
 330 ifa_any_preferences(const char *ifname, struct ifaddrs *ifap, int family)
 331 {
 332         struct ifaddrs *ifa;
 333
 334         /* Print address preference numbers if any address has a non-zero
 335          * preference assigned.
 336          */
 337         for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
 338                 if (strcmp(ifname, ifa->ifa_name) != 0)
 339                         continue;
 340                 if (ifa->ifa_addr->sa_family != family)
 341                         continue;
 342                 if (ifa_get_preference(ifa->ifa_name, ifa->ifa_addr) != 0)
 343                         return true;
 344         }
 345         return false;
 346 }