1 /* $NetBSD: af_inet.c,v 1.17 2015/05/12 14:05:29 roy Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __RCSID("$NetBSD: af_inet.c,v 1.17 2015/05/12 14:05:29 roy Exp $"); 35 #endif /* not lint */ 36 37 #include <sys/param.h> 38 #include <sys/ioctl.h> 39 #include <sys/socket.h> 40 41 #include <net/if.h> 42 #include <netinet/in.h> 43 #include <netinet/in_var.h> 44 45 #include <arpa/inet.h> 46 47 #include <assert.h> 48 #include <err.h> 49 #include <errno.h> 50 #include <ifaddrs.h> 51 #include <netdb.h> 52 #include <string.h> 53 #include <stdlib.h> 54 #include <stdio.h> 55 #include <util.h> 56 57 #include "env.h" 58 #include "extern.h" 59 #include "af_inetany.h" 60 #include "prog_ops.h" 61 62 static void in_constructor(void) __attribute__((constructor)); 63 static void in_status(prop_dictionary_t, prop_dictionary_t, bool); 64 static void in_commit_address(prop_dictionary_t, prop_dictionary_t); 65 static bool in_addr_tentative(struct ifaddrs *ifa); 66 static void in_alias(const char *, prop_dictionary_t, prop_dictionary_t, 67 struct in_aliasreq *); 68 69 static struct afswtch af = { 70 .af_name = "inet", .af_af = AF_INET, .af_status = in_status, 71 .af_addr_commit = in_commit_address, 72 .af_addr_tentative = in_addr_tentative 73 }; 74 75 static void 76 in_alias(const char *ifname, prop_dictionary_t env, prop_dictionary_t oenv, 77 struct in_aliasreq *creq) 78 { 79 struct ifreq ifr; 80 bool alias; 81 int s; 82 unsigned short flags; 83 struct in_aliasreq in_addreq; 84 const struct sockaddr_in * const asin = &in_addreq.ifra_addr; 85 const struct sockaddr_in * const dsin = &in_addreq.ifra_dstaddr; 86 const struct sockaddr_in * const bsin = &in_addreq.ifra_broadaddr; 87 char hbuf[NI_MAXHOST]; 88 const int niflag = Nflag ? 0 : NI_NUMERICHOST; 89 90 if (lflag) 91 return; 92 93 alias = true; 94 95 /* Get the non-alias address for this interface. */ 96 if ((s = getsock(AF_INET)) == -1) { 97 if (errno == EAFNOSUPPORT) 98 return; 99 err(EXIT_FAILURE, "socket"); 100 } 101 memset(&ifr, 0, sizeof(ifr)); 102 estrlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); 103 if (prog_ioctl(s, SIOCGIFADDR, &ifr) == -1) { 104 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) 105 return; 106 warn("SIOCGIFADDR"); 107 } 108 /* If creq and ifr are the same address, this is not an alias. */ 109 if (memcmp(&ifr.ifr_addr, &creq->ifra_addr, sizeof(ifr.ifr_addr)) == 0) 110 alias = false; 111 in_addreq = *creq; 112 if (prog_ioctl(s, SIOCGIFALIAS, &in_addreq) == -1) { 113 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) { 114 return; 115 } else 116 warn("SIOCGIFALIAS"); 117 } 118 119 if (getnameinfo((const struct sockaddr *)asin, asin->sin_len, 120 hbuf, sizeof(hbuf), NULL, 0, niflag)) 121 strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */ 122 printf("\tinet %s%s", alias ? "alias " : "", hbuf); 123 124 if (getifflags(env, oenv, &flags) == -1) 125 err(EXIT_FAILURE, "%s: getifflags", __func__); 126 127 if (flags & IFF_POINTOPOINT) { 128 if (getnameinfo((const struct sockaddr *)dsin, dsin->sin_len, 129 hbuf, sizeof(hbuf), NULL, 0, niflag)) 130 strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */ 131 printf(" -> %s", hbuf); 132 } 133 134 printf(" netmask 0x%x", ntohl(in_addreq.ifra_mask.sin_addr.s_addr)); 135 136 if (flags & IFF_BROADCAST) { 137 if (getnameinfo((const struct sockaddr *)bsin, bsin->sin_len, 138 hbuf, sizeof(hbuf), NULL, 0, niflag)) 139 strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */ 140 printf(" broadcast %s", hbuf); 141 } 142 143 #ifdef IN_IFF_TENTATIVE 144 memcpy(&ifr.ifr_addr, &creq->ifra_addr, creq->ifra_addr.sin_len); 145 if (prog_ioctl(s, SIOCGIFAFLAG_IN, &ifr) == -1) { 146 if (errno != EADDRNOTAVAIL) 147 warn("SIOCGIFAFLAG_IN"); 148 } else { 149 if (ifr.ifr_addrflags & IN_IFF_TENTATIVE) 150 printf(" tentative"); 151 if (ifr.ifr_addrflags & IN_IFF_DUPLICATED) 152 printf(" duplicated"); 153 if (ifr.ifr_addrflags & IN_IFF_DETACHED) 154 printf(" detached"); 155 } 156 #endif 157 } 158 159 static void 160 in_status(prop_dictionary_t env, prop_dictionary_t oenv, bool force) 161 { 162 struct ifaddrs *ifap, *ifa; 163 struct in_aliasreq ifra; 164 bool printprefs = false; 165 const char *ifname; 166 167 if ((ifname = getifname(env)) == NULL) 168 err(EXIT_FAILURE, "%s: getifname", __func__); 169 170 if (getifaddrs(&ifap) != 0) 171 err(EXIT_FAILURE, "getifaddrs"); 172 173 printprefs = ifa_any_preferences(ifname, ifap, AF_INET); 174 175 for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { 176 if (strcmp(ifname, ifa->ifa_name) != 0) 177 continue; 178 if (ifa->ifa_addr->sa_family != AF_INET) 179 continue; 180 if (sizeof(ifra.ifra_addr) < ifa->ifa_addr->sa_len) 181 continue; 182 183 memset(&ifra, 0, sizeof(ifra)); 184 estrlcpy(ifra.ifra_name, ifa->ifa_name, sizeof(ifra.ifra_name)); 185 memcpy(&ifra.ifra_addr, ifa->ifa_addr, ifa->ifa_addr->sa_len); 186 in_alias(ifa->ifa_name, env, oenv, &ifra); 187 if (printprefs) 188 ifa_print_preference(ifa->ifa_name, ifa->ifa_addr); 189 printf("\n"); 190 } 191 freeifaddrs(ifap); 192 } 193 194 static void 195 in_commit_address(prop_dictionary_t env, prop_dictionary_t oenv) 196 { 197 struct ifreq in_ifr; 198 struct in_aliasreq in_ifra; 199 struct afparam inparam = { 200 .req = BUFPARAM(in_ifra) 201 , .dgreq = BUFPARAM(in_ifr) 202 , .name = { 203 {.buf = in_ifr.ifr_name, 204 .buflen = sizeof(in_ifr.ifr_name)} 205 , {.buf = in_ifra.ifra_name, 206 .buflen = sizeof(in_ifra.ifra_name)} 207 } 208 , .dgaddr = BUFPARAM(in_ifr.ifr_addr) 209 , .addr = BUFPARAM(in_ifra.ifra_addr) 210 , .dst = BUFPARAM(in_ifra.ifra_dstaddr) 211 , .brd = BUFPARAM(in_ifra.ifra_broadaddr) 212 , .mask = BUFPARAM(in_ifra.ifra_mask) 213 , .aifaddr = IFADDR_PARAM(SIOCAIFADDR) 214 , .difaddr = IFADDR_PARAM(SIOCDIFADDR) 215 , .gifaddr = IFADDR_PARAM(SIOCGIFADDR) 216 , .defmask = {.buf = NULL, .buflen = 0} 217 }; 218 memset(&in_ifr, 0, sizeof(in_ifr)); 219 memset(&in_ifra, 0, sizeof(in_ifra)); 220 commit_address(env, oenv, &inparam); 221 } 222 223 static bool 224 in_addr_tentative(struct ifaddrs *ifa) 225 { 226 #ifdef IN_IFF_TENTATIVE 227 int s; 228 struct ifreq ifr; 229 230 memset(&ifr, 0, sizeof(ifr)); 231 strncpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name)); 232 ifr.ifr_addr = *ifa->ifa_addr; 233 if ((s = getsock(AF_INET)) == -1) 234 err(EXIT_FAILURE, "%s: getsock", __func__); 235 if (prog_ioctl(s, SIOCGIFAFLAG_IN, &ifr) == -1) 236 err(EXIT_FAILURE, "SIOCGIFAFLAG_IN"); 237 return ifr.ifr_addrflags & IN_IFF_TENTATIVE ? true : false; 238 #else 239 return false; 240 #endif 241 } 242 243 static void 244 in_constructor(void) 245 { 246 register_family(&af); 247 } 248