1 /* $NetBSD: util.c,v 1.20 2020/10/11 21:32:37 roy 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 1.20 2020/10/11 21:32:37 roy 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 warn("%s: ioctl SIOCGLIFADDR", __func__); 280 continue; 281 } 282 283 if (((iflr.flags & IFLR_ACTIVE) != 0) != print_active_only) 284 continue; 285 286 if (getnameinfo(ifa->ifa_addr, ifa->ifa_addr->sa_len, 287 hbuf, sizeof(hbuf), NULL, 0, 288 Nflag ? 0 : NI_NUMERICHOST) == 0 && 289 hbuf[0] != '\0') { 290 printf("\t%s %s\n", 291 print_active_only ? "address:" : "link", hbuf); 292 } 293 } 294 freeifaddrs(ifap); 295 } 296 297 int16_t 298 ifa_get_preference(const char *ifname, const struct sockaddr *sa) 299 { 300 struct if_addrprefreq ifap; 301 int s; 302 303 if ((s = getsock(sa->sa_family)) == -1) { 304 if (errno == EPROTONOSUPPORT) 305 return 0; 306 err(EXIT_FAILURE, "socket"); 307 } 308 memset(&ifap, 0, sizeof(ifap)); 309 estrlcpy(ifap.ifap_name, ifname, sizeof(ifap.ifap_name)); 310 memcpy(&ifap.ifap_addr, sa, MIN(sizeof(ifap.ifap_addr), sa->sa_len)); 311 if (prog_ioctl(s, SIOCGIFADDRPREF, &ifap) == -1) { 312 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) 313 return 0; 314 warn("SIOCGIFADDRPREF"); 315 } 316 return ifap.ifap_preference; 317 } 318 319 void 320 ifa_print_preference(const char *ifname, const struct sockaddr *sa) 321 { 322 int16_t preference; 323 324 if (lflag) 325 return; 326 327 preference = ifa_get_preference(ifname, sa); 328 printf(" preference %" PRId16, preference); 329 } 330 331 bool 332 ifa_any_preferences(const char *ifname, struct ifaddrs *ifap, int family) 333 { 334 struct ifaddrs *ifa; 335 336 /* Print address preference numbers if any address has a non-zero 337 * preference assigned. 338 */ 339 for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { 340 if (strcmp(ifname, ifa->ifa_name) != 0) 341 continue; 342 if (ifa->ifa_addr->sa_family != family) 343 continue; 344 if (ifa_get_preference(ifa->ifa_name, ifa->ifa_addr) != 0) 345 return true; 346 } 347 return false; 348 } 349