af_inet.c revision 1.26
1 /* $NetBSD: af_inet.c,v 1.26 2019/08/16 10:33:17 msaitoh 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 1.26 2019/08/16 10:33:17 msaitoh 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 *); 66 static bool in_addr_tentative_or_detached(struct ifaddrs *); 67 static in_addr_t in_netmask(struct sockaddr *);; 68 static int in_prefixlen(struct sockaddr *); 69 static void in_alias(struct ifaddrs *, prop_dictionary_t, prop_dictionary_t); 70 71 static struct afswtch af = { 72 .af_name = "inet", .af_af = AF_INET, .af_status = in_status, 73 .af_addr_commit = in_commit_address, 74 .af_addr_tentative = in_addr_tentative, 75 .af_addr_tentative_or_detached = in_addr_tentative_or_detached 76 }; 77 78 static in_addr_t 79 in_netmask(struct sockaddr *sa) 80 { 81 struct sockaddr_in sin; 82 83 memset(&sin, 0, sizeof(sin)); 84 memcpy(&sin, sa, sa->sa_len); 85 return ntohl(sin.sin_addr.s_addr); 86 } 87 88 static int 89 in_prefixlen(struct sockaddr *sa) 90 { 91 in_addr_t mask; 92 int cidr; 93 94 mask = in_netmask(sa); 95 if (mask == 0) /* mask 0 ==> /0 */ 96 return 0; 97 98 cidr = 33 - ffs(mask); /* 33 - (1 .. 32) -> 32 .. 1 */ 99 100 if (cidr < 32) { /* more than 1 bit in mask */ 101 /* check for non-contig netmask */ 102 if ((mask ^ (((1U << cidr) - 1) << (32 - cidr))) != 0) 103 return -1; /* noncontig, no pfxlen */ 104 } 105 106 return cidr; 107 } 108 109 static void 110 in_alias(struct ifaddrs *ifa, prop_dictionary_t env, prop_dictionary_t oenv) 111 { 112 char hbuf[NI_MAXHOST]; 113 const int niflag = Nflag ? 0 : NI_NUMERICHOST; 114 int pfxlen; 115 char fbuf[1024]; 116 117 if (lflag) 118 return; 119 120 if (getnameinfo(ifa->ifa_addr, ifa->ifa_addr->sa_len, 121 hbuf, sizeof(hbuf), NULL, 0, niflag)) 122 strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */ 123 printf("\tinet %s", hbuf); 124 pfxlen = in_prefixlen(ifa->ifa_netmask); 125 if (pfxlen >= 0) 126 printf("/%d", pfxlen); 127 128 if (ifa->ifa_flags & IFF_POINTOPOINT) { 129 if (getnameinfo(ifa->ifa_dstaddr, ifa->ifa_dstaddr->sa_len, 130 hbuf, sizeof(hbuf), NULL, 0, niflag)) 131 strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */ 132 printf(" -> %s", hbuf); 133 } 134 135 if (pfxlen < 0) 136 printf(" netmask %#x", in_netmask(ifa->ifa_netmask)); 137 138 if (ifa->ifa_flags & IFF_BROADCAST) { 139 if (getnameinfo(ifa->ifa_broadaddr, ifa->ifa_broadaddr->sa_len, 140 hbuf, sizeof(hbuf), NULL, 0, niflag)) 141 strlcpy(hbuf, "", sizeof(hbuf)); /* some message? */ 142 printf(" broadcast %s", hbuf); 143 } 144 145 (void)snprintb(fbuf, sizeof(fbuf), IN_IFFBITS, ifa->ifa_addrflags); 146 printf(" flags %s", fbuf); 147 } 148 149 static void 150 in_status(prop_dictionary_t env, prop_dictionary_t oenv, bool force) 151 { 152 struct ifaddrs *ifap, *ifa; 153 bool printprefs = false; 154 const char *ifname; 155 156 if ((ifname = getifname(env)) == NULL) 157 err(EXIT_FAILURE, "%s: getifname", __func__); 158 159 if (getifaddrs(&ifap) != 0) 160 err(EXIT_FAILURE, "getifaddrs"); 161 162 printprefs = ifa_any_preferences(ifname, ifap, AF_INET); 163 164 for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { 165 if (strcmp(ifname, ifa->ifa_name) != 0) 166 continue; 167 if (ifa->ifa_addr->sa_family != AF_INET) 168 continue; 169 /* The first address is not an alias. */ 170 in_alias(ifa, env, oenv); 171 if (printprefs) 172 ifa_print_preference(ifa->ifa_name, ifa->ifa_addr); 173 printf("\n"); 174 } 175 freeifaddrs(ifap); 176 } 177 178 static void 179 in_commit_address(prop_dictionary_t env, prop_dictionary_t oenv) 180 { 181 struct ifreq in_ifr; 182 struct in_aliasreq in_ifra; 183 struct afparam inparam = { 184 .req = BUFPARAM(in_ifra) 185 , .dgreq = BUFPARAM(in_ifr) 186 , .name = { 187 {.buf = in_ifr.ifr_name, 188 .buflen = sizeof(in_ifr.ifr_name)} 189 , {.buf = in_ifra.ifra_name, 190 .buflen = sizeof(in_ifra.ifra_name)} 191 } 192 , .dgaddr = BUFPARAM(in_ifr.ifr_addr) 193 , .addr = BUFPARAM(in_ifra.ifra_addr) 194 , .dst = BUFPARAM(in_ifra.ifra_dstaddr) 195 , .brd = BUFPARAM(in_ifra.ifra_broadaddr) 196 , .mask = BUFPARAM(in_ifra.ifra_mask) 197 , .aifaddr = IFADDR_PARAM(SIOCAIFADDR) 198 , .difaddr = IFADDR_PARAM(SIOCDIFADDR) 199 , .gifaddr = IFADDR_PARAM(SIOCGIFADDR) 200 , .defmask = {.buf = NULL, .buflen = 0} 201 }; 202 memset(&in_ifr, 0, sizeof(in_ifr)); 203 memset(&in_ifra, 0, sizeof(in_ifra)); 204 commit_address(env, oenv, &inparam); 205 } 206 207 #ifdef SIOCGIFAFLAG_IN 208 static bool 209 in_addr_flags(struct ifaddrs *ifa, int flags) 210 { 211 int s; 212 struct ifreq ifr; 213 214 memset(&ifr, 0, sizeof(ifr)); 215 estrlcpy(ifr.ifr_name, ifa->ifa_name, sizeof(ifr.ifr_name)); 216 ifr.ifr_addr = *ifa->ifa_addr; 217 if ((s = getsock(AF_INET)) == -1) 218 err(EXIT_FAILURE, "%s: getsock", __func__); 219 if (prog_ioctl(s, SIOCGIFAFLAG_IN, &ifr) == -1) 220 err(EXIT_FAILURE, "SIOCGIFAFLAG_IN"); 221 return ifr.ifr_addrflags & flags ? true : false; 222 return false; 223 } 224 #endif 225 226 static bool 227 in_addr_tentative(struct ifaddrs *ifa) 228 { 229 230 #ifdef SIOCGIFAFLAG_IN 231 return in_addr_flags(ifa, IN_IFF_TENTATIVE); 232 #else 233 return false; 234 #endif 235 } 236 237 static bool 238 in_addr_tentative_or_detached(struct ifaddrs *ifa) 239 { 240 241 #ifdef SIOCGIFAFLAG_IN 242 return in_addr_flags(ifa, IN_IFF_TENTATIVE | IN_IFF_DETACHED); 243 #else 244 return false; 245 #endif 246 } 247 248 static void 249 in_constructor(void) 250 { 251 register_family(&af); 252 } 253
Indexes created Sun Sep 28 16:09:52 GMT 2025