af_inet.c revision 227738
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 227738 2011-11-19 19:06:08Z glebius $"; 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 sin->sin_family = AF_INET; 108 109 if (which == ADDR) { 110 char *p = NULL; 111 112 if((p = strrchr(s, '/')) != NULL) { 113 const char *errstr; 114 /* address is `name/masklen' */ 115 int masklen; 116 struct sockaddr_in *min = sintab[MASK]; 117 *p = '\0'; 118 if (!isdigit(*(p + 1))) 119 errstr = "invalid"; 120 else 121 masklen = (int)strtonum(p + 1, 0, 32, &errstr); 122 if (errstr != NULL) { 123 *p = '/'; 124 errx(1, "%s: bad value (width %s)", s, errstr); 125 } 126 min->sin_len = sizeof(*min); 127 min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) & 128 0xffffffff); 129 } 130 } 131 132 if (inet_aton(s, &sin->sin_addr)) 133 return; 134 if ((hp = gethostbyname(s)) != 0) 135 bcopy(hp->h_addr, (char *)&sin->sin_addr, 136 MIN((size_t)hp->h_length, sizeof(sin->sin_addr))); 137 else if ((np = getnetbyname(s)) != 0) 138 sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY); 139 else 140 errx(1, "%s: bad value", s); 141#undef MIN 142} 143 144static void 145in_status_tunnel(int s) 146{ 147 char src[NI_MAXHOST]; 148 char dst[NI_MAXHOST]; 149 struct ifreq ifr; 150 const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr; 151 152 memset(&ifr, 0, sizeof(ifr)); 153 strncpy(ifr.ifr_name, name, IFNAMSIZ); 154 155 if (ioctl(s, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0) 156 return; 157 if (sa->sa_family != AF_INET) 158 return; 159 if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0) 160 src[0] = '\0'; 161 162 if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0) 163 return; 164 if (sa->sa_family != AF_INET) 165 return; 166 if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0) 167 dst[0] = '\0'; 168 169 printf("\ttunnel inet %s --> %s\n", src, dst); 170} 171 172static void 173in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres) 174{ 175 struct in_aliasreq addreq; 176 177 memset(&addreq, 0, sizeof(addreq)); 178 strncpy(addreq.ifra_name, name, IFNAMSIZ); 179 memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len); 180 memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len); 181 182 if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0) 183 warn("SIOCSIFPHYADDR"); 184} 185 186static struct afswtch af_inet = { 187 .af_name = "inet", 188 .af_af = AF_INET, 189 .af_status = in_status, 190 .af_getaddr = in_getaddr, 191 .af_status_tunnel = in_status_tunnel, 192 .af_settunnel = in_set_tunnel, 193 .af_difaddr = SIOCDIFADDR, 194 .af_aifaddr = SIOCAIFADDR, 195 .af_ridreq = &in_ridreq, 196 .af_addreq = &in_addreq, 197}; 198 199static __constructor void 200inet_ctor(void) 201{ 202 203#ifndef RESCUE 204 if (!feature_present("inet")) 205 return; 206#endif 207 af_register(&af_inet); 208} 209