af_inet.c revision 224179
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 * 4. 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 30#ifndef lint 31static const char rcsid[] = 32 "$FreeBSD: head/sbin/ifconfig/af_inet.c 224179 2011-07-18 10:29:16Z bz $"; 33#endif /* not lint */ 34 35#include <sys/types.h> 36#include <sys/ioctl.h> 37#include <sys/socket.h> 38#include <net/if.h> 39 40#include <ctype.h> 41#include <err.h> 42#include <stdio.h> 43#include <stdlib.h> 44#include <string.h> 45#include <unistd.h> 46#include <ifaddrs.h> 47 48#include <netinet/in.h> 49#include <net/if_var.h> /* for struct ifaddr */ 50#include <netinet/in_var.h> 51#include <arpa/inet.h> 52#include <netdb.h> 53 54#include "ifconfig.h" 55 56static struct in_aliasreq in_addreq; 57static struct ifreq in_ridreq; 58 59static void 60in_status(int s __unused, const struct ifaddrs *ifa) 61{ 62 struct sockaddr_in *sin, null_sin; 63 64 memset(&null_sin, 0, sizeof(null_sin)); 65 66 sin = (struct sockaddr_in *)ifa->ifa_addr; 67 if (sin == NULL) 68 return; 69 70 printf("\tinet %s ", inet_ntoa(sin->sin_addr)); 71 72 if (ifa->ifa_flags & IFF_POINTOPOINT) { 73 sin = (struct sockaddr_in *)ifa->ifa_dstaddr; 74 if (sin == NULL) 75 sin = &null_sin; 76 printf("--> %s ", inet_ntoa(sin->sin_addr)); 77 } 78 79 sin = (struct sockaddr_in *)ifa->ifa_netmask; 80 if (sin == NULL) 81 sin = &null_sin; 82 printf("netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr)); 83 84 if (ifa->ifa_flags & IFF_BROADCAST) { 85 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 86 if (sin != NULL && sin->sin_addr.s_addr != 0) 87 printf("broadcast %s", inet_ntoa(sin->sin_addr)); 88 } 89 putchar('\n'); 90} 91 92#define SIN(x) ((struct sockaddr_in *) &(x)) 93static struct sockaddr_in *sintab[] = { 94 SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr), 95 SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr) 96}; 97 98static void 99in_getaddr(const char *s, int which) 100{ 101#define MIN(a,b) ((a)<(b)?(a):(b)) 102 struct sockaddr_in *sin = sintab[which]; 103 struct hostent *hp; 104 struct netent *np; 105 106 sin->sin_len = sizeof(*sin); 107 if (which != MASK) 108 sin->sin_family = AF_INET; 109 110 if (which == ADDR) { 111 char *p = NULL; 112 113 if((p = strrchr(s, '/')) != NULL) { 114 const char *errstr; 115 /* address is `name/masklen' */ 116 int masklen; 117 struct sockaddr_in *min = sintab[MASK]; 118 *p = '\0'; 119 if (!isdigit(*(p + 1))) 120 errstr = "invalid"; 121 else 122 masklen = (int)strtonum(p + 1, 0, 32, &errstr); 123 if (errstr != NULL) { 124 *p = '/'; 125 errx(1, "%s: bad value (width %s)", s, errstr); 126 } 127 min->sin_len = sizeof(*min); 128 min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) & 129 0xffffffff); 130 } 131 } 132 133 if (inet_aton(s, &sin->sin_addr)) 134 return; 135 if ((hp = gethostbyname(s)) != 0) 136 bcopy(hp->h_addr, (char *)&sin->sin_addr, 137 MIN((size_t)hp->h_length, sizeof(sin->sin_addr))); 138 else if ((np = getnetbyname(s)) != 0) 139 sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY); 140 else 141 errx(1, "%s: bad value", s); 142#undef MIN 143} 144 145static void 146in_status_tunnel(int s) 147{ 148 char src[NI_MAXHOST]; 149 char dst[NI_MAXHOST]; 150 struct ifreq ifr; 151 const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr; 152 153 memset(&ifr, 0, sizeof(ifr)); 154 strncpy(ifr.ifr_name, name, IFNAMSIZ); 155 156 if (ioctl(s, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0) 157 return; 158 if (sa->sa_family != AF_INET) 159 return; 160 if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0) 161 src[0] = '\0'; 162 163 if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0) 164 return; 165 if (sa->sa_family != AF_INET) 166 return; 167 if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0) 168 dst[0] = '\0'; 169 170 printf("\ttunnel inet %s --> %s\n", src, dst); 171} 172 173static void 174in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres) 175{ 176 struct in_aliasreq addreq; 177 178 memset(&addreq, 0, sizeof(addreq)); 179 strncpy(addreq.ifra_name, name, IFNAMSIZ); 180 memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len); 181 memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len); 182 183 if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0) 184 warn("SIOCSIFPHYADDR"); 185} 186 187static struct afswtch af_inet = { 188 .af_name = "inet", 189 .af_af = AF_INET, 190 .af_status = in_status, 191 .af_getaddr = in_getaddr, 192 .af_status_tunnel = in_status_tunnel, 193 .af_settunnel = in_set_tunnel, 194 .af_difaddr = SIOCDIFADDR, 195 .af_aifaddr = SIOCAIFADDR, 196 .af_ridreq = &in_ridreq, 197 .af_addreq = &in_addreq, 198}; 199 200static __constructor void 201inet_ctor(void) 202{ 203 204#ifndef RESCUE 205 if (!feature_present("inet")) 206 return; 207#endif 208 af_register(&af_inet); 209} 210