af_inet.c revision 1.12
1 /* $NetBSD: af_inet.c,v 1.12 2008/07/02 07:44:14 dyoung 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 1.12 2008/07/02 07:44:14 dyoung 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 61 static void in_constructor(void) __attribute__((constructor)); 62 static void in_status(prop_dictionary_t, prop_dictionary_t, bool); 63 static void in_commit_address(prop_dictionary_t, prop_dictionary_t); 64 static void in_alias(const char *, prop_dictionary_t, prop_dictionary_t, 65 struct in_aliasreq *); 66 static void in_preference(const char *, const struct sockaddr *); 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 83 if (lflag) 84 return; 85 86 alias = true; 87 88 /* Get the non-alias address for this interface. */ 89 if ((s = getsock(AF_INET)) == -1) { 90 if (errno == EAFNOSUPPORT) 91 return; 92 err(EXIT_FAILURE, "socket"); 93 } 94 memset(&ifr, 0, sizeof(ifr)); 95 estrlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); 96 if (ioctl(s, SIOCGIFADDR, &ifr) == -1) { 97 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) 98 return; 99 warn("SIOCGIFADDR"); 100 } 101 /* If creq and ifr are the same address, this is not an alias. */ 102 if (memcmp(&ifr.ifr_addr, &creq->ifra_addr, sizeof(ifr.ifr_addr)) == 0) 103 alias = false; 104 in_addreq = *creq; 105 if (ioctl(s, SIOCGIFALIAS, &in_addreq) == -1) { 106 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) { 107 return; 108 } else 109 warn("SIOCGIFALIAS"); 110 } 111 112 printf("\tinet %s%s", alias ? "alias " : "", 113 inet_ntoa(in_addreq.ifra_addr.sin_addr)); 114 115 if (getifflags(env, oenv, &flags) == -1) 116 err(EXIT_FAILURE, "%s: getifflags", __func__); 117 118 if (flags & IFF_POINTOPOINT) 119 printf(" -> %s", inet_ntoa(in_addreq.ifra_dstaddr.sin_addr)); 120 121 printf(" netmask 0x%x", ntohl(in_addreq.ifra_mask.sin_addr.s_addr)); 122 123 if (flags & IFF_BROADCAST) { 124 printf(" broadcast %s", 125 inet_ntoa(in_addreq.ifra_broadaddr.sin_addr)); 126 } 127 } 128 129 static int16_t 130 in_get_preference(const char *ifname, const struct sockaddr *sa) 131 { 132 struct if_addrprefreq ifap; 133 int s; 134 135 if ((s = getsock(AF_INET)) == -1) { 136 if (errno == EPROTONOSUPPORT) 137 return 0; 138 err(EXIT_FAILURE, "socket"); 139 } 140 memset(&ifap, 0, sizeof(ifap)); 141 estrlcpy(ifap.ifap_name, ifname, sizeof(ifap.ifap_name)); 142 memcpy(&ifap.ifap_addr, sa, MIN(sizeof(ifap.ifap_addr), sa->sa_len)); 143 if (ioctl(s, SIOCGIFADDRPREF, &ifap) == -1) { 144 if (errno == EADDRNOTAVAIL || errno == EAFNOSUPPORT) 145 return 0; 146 warn("SIOCGIFADDRPREF"); 147 } 148 return ifap.ifap_preference; 149 } 150 151 static void 152 in_preference(const char *ifname, const struct sockaddr *sa) 153 { 154 int16_t preference; 155 156 if (lflag) 157 return; 158 159 preference = in_get_preference(ifname, sa); 160 printf(" preference %" PRId16, preference); 161 } 162 163 static void 164 in_status(prop_dictionary_t env, prop_dictionary_t oenv, bool force) 165 { 166 struct ifaddrs *ifap, *ifa; 167 struct in_aliasreq ifra; 168 int printprefs = 0; 169 const char *ifname; 170 171 if ((ifname = getifname(env)) == NULL) 172 err(EXIT_FAILURE, "%s: getifname", __func__); 173 174 if (getifaddrs(&ifap) != 0) 175 err(EXIT_FAILURE, "getifaddrs"); 176 177 /* Print address preference numbers if any address has a non-zero 178 * preference assigned. 179 */ 180 for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { 181 if (strcmp(ifname, ifa->ifa_name) != 0) 182 continue; 183 if (ifa->ifa_addr->sa_family != AF_INET) 184 continue; 185 if (in_get_preference(ifa->ifa_name, ifa->ifa_addr) != 0) { 186 printprefs = 1; 187 break; 188 } 189 } 190 for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { 191 if (strcmp(ifname, ifa->ifa_name) != 0) 192 continue; 193 if (ifa->ifa_addr->sa_family != AF_INET) 194 continue; 195 if (sizeof(ifra.ifra_addr) < ifa->ifa_addr->sa_len) 196 continue; 197 198 memset(&ifra, 0, sizeof(ifra)); 199 estrlcpy(ifra.ifra_name, ifa->ifa_name, sizeof(ifra.ifra_name)); 200 memcpy(&ifra.ifra_addr, ifa->ifa_addr, ifa->ifa_addr->sa_len); 201 in_alias(ifa->ifa_name, env, oenv, &ifra); 202 if (printprefs) 203 in_preference(ifa->ifa_name, ifa->ifa_addr); 204 printf("\n"); 205 } 206 freeifaddrs(ifap); 207 } 208 209 static void 210 in_commit_address(prop_dictionary_t env, prop_dictionary_t oenv) 211 { 212 struct ifreq in_ifr; 213 struct in_aliasreq in_ifra; 214 struct afparam inparam = { 215 .req = BUFPARAM(in_ifra) 216 , .dgreq = BUFPARAM(in_ifr) 217 , .name = { 218 {.buf = in_ifr.ifr_name, 219 .buflen = sizeof(in_ifr.ifr_name)} 220 , {.buf = in_ifra.ifra_name, 221 .buflen = sizeof(in_ifra.ifra_name)} 222 } 223 , .dgaddr = BUFPARAM(in_ifr.ifr_addr) 224 , .addr = BUFPARAM(in_ifra.ifra_addr) 225 , .dst = BUFPARAM(in_ifra.ifra_dstaddr) 226 , .brd = BUFPARAM(in_ifra.ifra_broadaddr) 227 , .mask = BUFPARAM(in_ifra.ifra_mask) 228 , .aifaddr = IFADDR_PARAM(SIOCAIFADDR) 229 , .difaddr = IFADDR_PARAM(SIOCDIFADDR) 230 , .gifaddr = IFADDR_PARAM(SIOCGIFADDR) 231 , .defmask = {.buf = NULL, .buflen = 0} 232 }; 233 memset(&in_ifr, 0, sizeof(in_ifr)); 234 memset(&in_ifra, 0, sizeof(in_ifra)); 235 commit_address(env, oenv, &inparam); 236 } 237 238 static void 239 in_constructor(void) 240 { 241 register_family(&af); 242 } 243
Indexes created Mon Sep 29 15:09:53 GMT 2025