1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: src/sbin/ifconfig/af_inet.c,v 1.2 2005/06/16 19:37:09 ume Exp $ 30 */ 31 32 #include <sys/param.h> 33 #include <sys/types.h> 34 #include <sys/ioctl.h> 35 #include <sys/socket.h> 36 #include <net/if.h> 37 #include <net/if_var.h> /* for struct ifaddr */ 38 #include <netinet/in.h> 39 #include <netinet/in_var.h> 40 #include <arpa/inet.h> 41 #include <netdb.h> 42 43 #include <err.h> 44 #include <ifaddrs.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 #include "ifconfig.h" 51 52 static struct ifaliasreq in_addreq; 53 static struct ifreq in_ridreq; 54 static char addr_buf[NI_MAXHOST]; /* for getnameinfo() */ 55 56 static void 57 in_status(int s __unused, const struct ifaddrs *ifa) 58 { 59 struct sockaddr_in *sin, null_sin; 60 int error, n_flags; 61 62 memset(&null_sin, 0, sizeof(null_sin)); 63 64 sin = (struct sockaddr_in *)ifa->ifa_addr; 65 if (sin == NULL) 66 return; 67 68 if (f_addr != NULL && strcmp(f_addr, "fqdn") == 0) 69 n_flags = 0; 70 else if (f_addr != NULL && strcmp(f_addr, "host") == 0) 71 n_flags = NI_NOFQDN; 72 else 73 n_flags = NI_NUMERICHOST; 74 75 error = getnameinfo((struct sockaddr *)sin, sin->sin_len, addr_buf, 76 sizeof(addr_buf), NULL, 0, n_flags); 77 if (error != 0) 78 inet_ntop(AF_INET, &sin->sin_addr, addr_buf, sizeof(addr_buf)); 79 80 printf("\tinet %s", addr_buf); 81 82 if (ifa->ifa_flags & IFF_POINTOPOINT) { 83 sin = (struct sockaddr_in *)ifa->ifa_dstaddr; 84 if (sin == NULL) 85 sin = &null_sin; 86 printf(" --> %s", inet_ntoa(sin->sin_addr)); 87 } 88 89 sin = (struct sockaddr_in *)ifa->ifa_netmask; 90 if (sin == NULL) 91 sin = &null_sin; 92 if (f_inet != NULL && strcmp(f_inet, "cidr") == 0) { 93 int cidr = 32; 94 unsigned long smask = ntohl(sin->sin_addr.s_addr); 95 96 while ((smask & 1) == 0) { 97 smask >>= 1; 98 cidr--; 99 if (cidr == 0) 100 break; 101 } 102 printf("/%d", cidr); 103 } else if (f_inet != NULL && strcmp(f_inet, "dotted") == 0) { 104 printf(" netmask %s", inet_ntoa(sin->sin_addr)); 105 } else { 106 printf(" netmask 0x%lx", 107 (unsigned long)ntohl(sin->sin_addr.s_addr)); 108 } 109 110 if (ifa->ifa_flags & IFF_BROADCAST) { 111 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 112 if (sin != NULL && sin->sin_addr.s_addr != 0) 113 printf(" broadcast %s", inet_ntoa(sin->sin_addr)); 114 } 115 putchar('\n'); 116 } 117 118 #define SIN(x) ((struct sockaddr_in *) &(x)) 119 static struct sockaddr_in *sintab[] = { 120 SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr), 121 SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr) 122 }; 123 124 static void 125 in_getaddr(const char *s, int which) 126 { 127 struct sockaddr_in *sin = sintab[which]; 128 struct hostent *hp; 129 struct netent *np; 130 131 sin->sin_len = sizeof(*sin); 132 if (which != MASK) 133 sin->sin_family = AF_INET; 134 135 if (which == ADDR) { 136 char *p = NULL; 137 138 if ((p = strrchr(s, '/')) != NULL) { 139 /* address is `name/masklen' */ 140 int masklen, ret; 141 struct sockaddr_in *min = sintab[MASK]; 142 143 *p = '\0'; 144 ret = sscanf(p+1, "%u", &masklen); 145 if (ret != 1 || (masklen < 0 || masklen > 32)) { 146 *p = '/'; 147 errx(1, "%s: bad value", s); 148 } 149 min->sin_len = sizeof(*min); 150 min->sin_addr.s_addr = 151 htonl(rounddown2(0xffffffff, 1LL << (32 - masklen))); 152 } 153 } 154 155 if (inet_aton(s, &sin->sin_addr)) 156 return; 157 if ((hp = gethostbyname(s)) != NULL) 158 memcpy(&sin->sin_addr, hp->h_addr, 159 MIN((size_t)hp->h_length, sizeof(sin->sin_addr))); 160 else if ((np = getnetbyname(s)) != NULL) 161 sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY); 162 else 163 errx(1, "%s: bad value", s); 164 } 165 166 static void 167 in_status_tunnel(int s) 168 { 169 char src[NI_MAXHOST]; 170 char dst[NI_MAXHOST]; 171 struct ifreq ifr; 172 const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr; 173 174 memset(&ifr, 0, sizeof(ifr)); 175 strlcpy(ifr.ifr_name, IfName, sizeof(ifr.ifr_name)); 176 177 if (ioctl(s, SIOCGIFPSRCADDR, &ifr) < 0) 178 return; 179 if (sa->sa_family != AF_INET) 180 return; 181 if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, 182 NI_NUMERICHOST) != 0) 183 src[0] = '\0'; 184 185 if (ioctl(s, SIOCGIFPDSTADDR, &ifr) < 0) 186 return; 187 if (sa->sa_family != AF_INET) 188 return; 189 if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, 190 NI_NUMERICHOST) != 0) 191 dst[0] = '\0'; 192 193 printf("\ttunnel inet %s --> %s\n", src, dst); 194 } 195 196 static void 197 in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres) 198 { 199 struct ifaliasreq addreq; 200 201 memset(&addreq, 0, sizeof(addreq)); 202 strlcpy(addreq.ifra_name, IfName, sizeof(addreq.ifra_name)); 203 memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len); 204 memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len); 205 206 if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0) 207 warn("SIOCSIFPHYADDR"); 208 } 209 210 static struct afswtch af_inet = { 211 .af_name = "inet", 212 .af_af = AF_INET, 213 .af_status = in_status, 214 .af_getaddr = in_getaddr, 215 .af_status_tunnel = in_status_tunnel, 216 .af_settunnel = in_set_tunnel, 217 .af_difaddr = SIOCDIFADDR, 218 .af_aifaddr = SIOCAIFADDR, 219 .af_ridreq = &in_ridreq, 220 .af_addreq = &in_addreq, 221 }; 222 223 __constructor(112) 224 static void 225 inet_ctor(void) 226 { 227 af_register(&af_inet); 228 } 229