1 /* $NetBSD: af_inet.c,v 1.15 2010/12/13 17:35:08 pooka 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 1.15 2010/12/13 17:35:08 pooka 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 void in_alias(const char *, prop_dictionary_t, prop_dictionary_t, 66 struct in_aliasreq *); 67 68 static struct afswtch af = { 69 .af_name = "inet", .af_af = AF_INET, .af_status = in_status, 70 .af_addr_commit = in_commit_address 71 }; 72 73 static void 74 in_alias(const char *ifname, prop_dictionary_t env, prop_dictionary_t oenv, 75 struct in_aliasreq *creq) 76 { 77 struct ifreq ifr; 78 bool alias; 79 int s; 80 unsigned short flags; 81 struct in_aliasreq in_addreq; 82 const struct sockaddr_in * const asin = &in_addreq.ifra_addr; 83 const struct sockaddr_in * const dsin = &in_addreq.ifra_dstaddr; 84 const struct sockaddr_in * const bsin = &in_addreq.ifra_broadaddr; 85 char hbuf[NI_MAXHOST]; 86 const int niflag = Nflag ? 0 : NI_NUMERICHOST; 87 88 if (lflag) 89 return; 90 91 alias = true; 92 93 /* Get the non-alias address for this interface. */ 94 if ((s = getsock(AF_INET)) == -1) { 95 if (errno == EAFNOSUPPORT) 96 return; 97 err(EXIT_FAILURE, "socket"); 98 } 99 memset(&ifr, 0, sizeof(ifr)); 100 estrlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); 101 if (prog_ioctl(s, SIOCGIFADDR, &ifr) == -1) { 102 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) 103 return; 104 warn("SIOCGIFADDR"); 105 } 106 /* If creq and ifr are the same address, this is not an alias. */ 107 if (memcmp(&ifr.ifr_addr, &creq->ifra_addr, sizeof(ifr.ifr_addr)) == 0) 108 alias = false; 109 in_addreq = *creq; 110 if (prog_ioctl(s, SIOCGIFALIAS, &in_addreq) == -1) { 111 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) { 112 return; 113 } else 114 warn("SIOCGIFALIAS"); 115 } 116 117 if (getnameinfo((const struct sockaddr *)asin, asin->sin_len, 118 hbuf, sizeof(hbuf), NULL, 0, niflag)) 119 strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */ 120 printf("\tinet %s%s", alias ? "alias " : "", hbuf); 121 122 if (getifflags(env, oenv, &flags) == -1) 123 err(EXIT_FAILURE, "%s: getifflags", __func__); 124 125 if (flags & IFF_POINTOPOINT) { 126 if (getnameinfo((const struct sockaddr *)dsin, dsin->sin_len, 127 hbuf, sizeof(hbuf), NULL, 0, niflag)) 128 strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */ 129 printf(" -> %s", hbuf); 130 } 131 132 printf(" netmask 0x%x", ntohl(in_addreq.ifra_mask.sin_addr.s_addr)); 133 134 if (flags & IFF_BROADCAST) { 135 if (getnameinfo((const struct sockaddr *)bsin, bsin->sin_len, 136 hbuf, sizeof(hbuf), NULL, 0, niflag)) 137 strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */ 138 printf(" broadcast %s", hbuf); 139 } 140 } 141 142 static void 143 in_status(prop_dictionary_t env, prop_dictionary_t oenv, bool force) 144 { 145 struct ifaddrs *ifap, *ifa; 146 struct in_aliasreq ifra; 147 bool printprefs = false; 148 const char *ifname; 149 150 if ((ifname = getifname(env)) == NULL) 151 err(EXIT_FAILURE, "%s: getifname", __func__); 152 153 if (getifaddrs(&ifap) != 0) 154 err(EXIT_FAILURE, "getifaddrs"); 155 156 printprefs = ifa_any_preferences(ifname, ifap, AF_INET); 157 158 for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { 159 if (strcmp(ifname, ifa->ifa_name) != 0) 160 continue; 161 if (ifa->ifa_addr->sa_family != AF_INET) 162 continue; 163 if (sizeof(ifra.ifra_addr) < ifa->ifa_addr->sa_len) 164 continue; 165 166 memset(&ifra, 0, sizeof(ifra)); 167 estrlcpy(ifra.ifra_name, ifa->ifa_name, sizeof(ifra.ifra_name)); 168 memcpy(&ifra.ifra_addr, ifa->ifa_addr, ifa->ifa_addr->sa_len); 169 in_alias(ifa->ifa_name, env, oenv, &ifra); 170 if (printprefs) 171 ifa_print_preference(ifa->ifa_name, ifa->ifa_addr); 172 printf("\n"); 173 } 174 freeifaddrs(ifap); 175 } 176 177 static void 178 in_commit_address(prop_dictionary_t env, prop_dictionary_t oenv) 179 { 180 struct ifreq in_ifr; 181 struct in_aliasreq in_ifra; 182 struct afparam inparam = { 183 .req = BUFPARAM(in_ifra) 184 , .dgreq = BUFPARAM(in_ifr) 185 , .name = { 186 {.buf = in_ifr.ifr_name, 187 .buflen = sizeof(in_ifr.ifr_name)} 188 , {.buf = in_ifra.ifra_name, 189 .buflen = sizeof(in_ifra.ifra_name)} 190 } 191 , .dgaddr = BUFPARAM(in_ifr.ifr_addr) 192 , .addr = BUFPARAM(in_ifra.ifra_addr) 193 , .dst = BUFPARAM(in_ifra.ifra_dstaddr) 194 , .brd = BUFPARAM(in_ifra.ifra_broadaddr) 195 , .mask = BUFPARAM(in_ifra.ifra_mask) 196 , .aifaddr = IFADDR_PARAM(SIOCAIFADDR) 197 , .difaddr = IFADDR_PARAM(SIOCDIFADDR) 198 , .gifaddr = IFADDR_PARAM(SIOCGIFADDR) 199 , .defmask = {.buf = NULL, .buflen = 0} 200 }; 201 memset(&in_ifr, 0, sizeof(in_ifr)); 202 memset(&in_ifra, 0, sizeof(in_ifra)); 203 commit_address(env, oenv, &inparam); 204 } 205 206 static void 207 in_constructor(void) 208 { 209 register_family(&af); 210 } 211