af_inet.c revision 330897
1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 * 4. 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#ifndef lint 33static const char rcsid[] = 34 "$FreeBSD: stable/11/sbin/ifconfig/af_inet.c 330897 2018-03-14 03:19:51Z eadler $"; 35#endif /* not lint */ 36 37#include <sys/param.h> 38#include <sys/ioctl.h> 39#include <sys/socket.h> 40#include <net/if.h> 41 42#include <ctype.h> 43#include <err.h> 44#include <stdio.h> 45#include <stdlib.h> 46#include <string.h> 47#include <unistd.h> 48#include <ifaddrs.h> 49 50#include <netinet/in.h> 51#include <netinet/in_var.h> 52#include <arpa/inet.h> 53#include <netdb.h> 54 55#include "ifconfig.h" 56 57static struct in_aliasreq in_addreq; 58static struct ifreq in_ridreq; 59static char addr_buf[NI_MAXHOST]; /*for getnameinfo()*/ 60extern char *f_inet, *f_addr; 61 62static void 63in_status(int s __unused, const struct ifaddrs *ifa) 64{ 65 struct sockaddr_in *sin, null_sin; 66 int error, n_flags; 67 68 memset(&null_sin, 0, sizeof(null_sin)); 69 70 sin = (struct sockaddr_in *)ifa->ifa_addr; 71 if (sin == NULL) 72 return; 73 74 if (f_addr != NULL && strcmp(f_addr, "fqdn") == 0) 75 n_flags = 0; 76 else if (f_addr != NULL && strcmp(f_addr, "host") == 0) 77 n_flags = NI_NOFQDN; 78 else 79 n_flags = NI_NUMERICHOST; 80 81 error = getnameinfo((struct sockaddr *)sin, sin->sin_len, addr_buf, 82 sizeof(addr_buf), NULL, 0, n_flags); 83 84 if (error) 85 inet_ntop(AF_INET, &sin->sin_addr, addr_buf, sizeof(addr_buf)); 86 87 printf("\tinet %s", addr_buf); 88 89 if (ifa->ifa_flags & IFF_POINTOPOINT) { 90 sin = (struct sockaddr_in *)ifa->ifa_dstaddr; 91 if (sin == NULL) 92 sin = &null_sin; 93 printf(" --> %s", inet_ntoa(sin->sin_addr)); 94 } 95 96 sin = (struct sockaddr_in *)ifa->ifa_netmask; 97 if (sin == NULL) 98 sin = &null_sin; 99 if (f_inet != NULL && strcmp(f_inet, "cidr") == 0) { 100 int cidr = 32; 101 unsigned long smask; 102 103 smask = ntohl(sin->sin_addr.s_addr); 104 while ((smask & 1) == 0) { 105 smask = smask >> 1; 106 cidr--; 107 if (cidr == 0) 108 break; 109 } 110 printf("/%d ", cidr); 111 } else if (f_inet != NULL && strcmp(f_inet, "dotted") == 0) 112 printf(" netmask %s ", inet_ntoa(sin->sin_addr)); 113 else 114 printf(" netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr)); 115 116 if (ifa->ifa_flags & IFF_BROADCAST) { 117 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 118 if (sin != NULL && sin->sin_addr.s_addr != 0) 119 printf("broadcast %s ", inet_ntoa(sin->sin_addr)); 120 } 121 122 print_vhid(ifa, " "); 123 124 putchar('\n'); 125} 126 127#define SIN(x) ((struct sockaddr_in *) &(x)) 128static struct sockaddr_in *sintab[] = { 129 SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr), 130 SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr) 131}; 132 133static void 134in_getaddr(const char *s, int which) 135{ 136 struct sockaddr_in *sin = sintab[which]; 137 struct hostent *hp; 138 struct netent *np; 139 140 sin->sin_len = sizeof(*sin); 141 sin->sin_family = AF_INET; 142 143 if (which == ADDR) { 144 char *p = NULL; 145 146 if((p = strrchr(s, '/')) != NULL) { 147 const char *errstr; 148 /* address is `name/masklen' */ 149 int masklen; 150 struct sockaddr_in *min = sintab[MASK]; 151 *p = '\0'; 152 if (!isdigit(*(p + 1))) 153 errstr = "invalid"; 154 else 155 masklen = (int)strtonum(p + 1, 0, 32, &errstr); 156 if (errstr != NULL) { 157 *p = '/'; 158 errx(1, "%s: bad value (width %s)", s, errstr); 159 } 160 min->sin_family = AF_INET; 161 min->sin_len = sizeof(*min); 162 min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) & 163 0xffffffff); 164 } 165 } 166 167 if (inet_aton(s, &sin->sin_addr)) 168 return; 169 if ((hp = gethostbyname(s)) != NULL) 170 bcopy(hp->h_addr, (char *)&sin->sin_addr, 171 MIN((size_t)hp->h_length, sizeof(sin->sin_addr))); 172 else if ((np = getnetbyname(s)) != NULL) 173 sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY); 174 else 175 errx(1, "%s: bad value", s); 176} 177 178static void 179in_status_tunnel(int s) 180{ 181 char src[NI_MAXHOST]; 182 char dst[NI_MAXHOST]; 183 struct ifreq ifr; 184 const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr; 185 186 memset(&ifr, 0, sizeof(ifr)); 187 strlcpy(ifr.ifr_name, name, IFNAMSIZ); 188 189 if (ioctl(s, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0) 190 return; 191 if (sa->sa_family != AF_INET) 192 return; 193 if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0) 194 src[0] = '\0'; 195 196 if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0) 197 return; 198 if (sa->sa_family != AF_INET) 199 return; 200 if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0) 201 dst[0] = '\0'; 202 203 printf("\ttunnel inet %s --> %s\n", src, dst); 204} 205 206static void 207in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres) 208{ 209 struct in_aliasreq addreq; 210 211 memset(&addreq, 0, sizeof(addreq)); 212 strlcpy(addreq.ifra_name, name, IFNAMSIZ); 213 memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len); 214 memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len); 215 216 if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0) 217 warn("SIOCSIFPHYADDR"); 218} 219 220static struct afswtch af_inet = { 221 .af_name = "inet", 222 .af_af = AF_INET, 223 .af_status = in_status, 224 .af_getaddr = in_getaddr, 225 .af_status_tunnel = in_status_tunnel, 226 .af_settunnel = in_set_tunnel, 227 .af_difaddr = SIOCDIFADDR, 228 .af_aifaddr = SIOCAIFADDR, 229 .af_ridreq = &in_ridreq, 230 .af_addreq = &in_addreq, 231}; 232 233static __constructor void 234inet_ctor(void) 235{ 236 237#ifndef RESCUE 238 if (!feature_present("inet")) 239 return; 240#endif 241 af_register(&af_inet); 242} 243