af_inet.c revision 191121
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 191121 2009-04-15 20:53:34Z brooks $"; 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 <err.h> 41#include <stdio.h> 42#include <stdlib.h> 43#include <string.h> 44#include <unistd.h> 45#include <ifaddrs.h> 46 47#include <netinet/in.h> 48#include <net/if_var.h> /* for struct ifaddr */ 49#include <netinet/in_var.h> 50#include <arpa/inet.h> 51#include <netdb.h> 52 53#include "ifconfig.h" 54 55static struct in_aliasreq in_addreq; 56static struct ifreq in_ridreq; 57 58static void 59in_status(int s __unused, const struct ifaddrs *ifa) 60{ 61 struct sockaddr_in *sin, null_sin; 62 63 memset(&null_sin, 0, sizeof(null_sin)); 64 65 sin = (struct sockaddr_in *)ifa->ifa_addr; 66 if (sin == NULL) 67 return; 68 69 printf("\tinet %s ", inet_ntoa(sin->sin_addr)); 70 71 if (ifa->ifa_flags & IFF_POINTOPOINT) { 72 sin = (struct sockaddr_in *)ifa->ifa_dstaddr; 73 if (sin == NULL) 74 sin = &null_sin; 75 printf("--> %s ", inet_ntoa(sin->sin_addr)); 76 } 77 78 sin = (struct sockaddr_in *)ifa->ifa_netmask; 79 if (sin == NULL) 80 sin = &null_sin; 81 printf("netmask 0x%lx ", (unsigned long)ntohl(sin->sin_addr.s_addr)); 82 83 if (ifa->ifa_flags & IFF_BROADCAST) { 84 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 85 if (sin != NULL && sin->sin_addr.s_addr != 0) 86 printf("broadcast %s", inet_ntoa(sin->sin_addr)); 87 } 88 putchar('\n'); 89} 90 91#define SIN(x) ((struct sockaddr_in *) &(x)) 92static struct sockaddr_in *sintab[] = { 93 SIN(in_ridreq.ifr_addr), SIN(in_addreq.ifra_addr), 94 SIN(in_addreq.ifra_mask), SIN(in_addreq.ifra_broadaddr) 95}; 96 97static void 98in_getaddr(const char *s, int which) 99{ 100#define MIN(a,b) ((a)<(b)?(a):(b)) 101 struct sockaddr_in *sin = sintab[which]; 102 struct hostent *hp; 103 struct netent *np; 104 105 sin->sin_len = sizeof(*sin); 106 if (which != MASK) 107 sin->sin_family = AF_INET; 108 109 if (which == ADDR) { 110 char *p = NULL; 111 112 if((p = strrchr(s, '/')) != NULL) { 113 /* address is `name/masklen' */ 114 int masklen; 115 int ret; 116 struct sockaddr_in *min = sintab[MASK]; 117 *p = '\0'; 118 ret = sscanf(p+1, "%u", &masklen); 119 if(ret != 1 || (masklen < 0 || masklen > 32)) { 120 *p = '/'; 121 errx(1, "%s: bad value", s); 122 } 123 min->sin_len = sizeof(*min); 124 min->sin_addr.s_addr = htonl(~((1LL << (32 - masklen)) - 1) & 125 0xffffffff); 126 } 127 } 128 129 if (inet_aton(s, &sin->sin_addr)) 130 return; 131 if ((hp = gethostbyname(s)) != 0) 132 bcopy(hp->h_addr, (char *)&sin->sin_addr, 133 MIN(hp->h_length, sizeof(sin->sin_addr))); 134 else if ((np = getnetbyname(s)) != 0) 135 sin->sin_addr = inet_makeaddr(np->n_net, INADDR_ANY); 136 else 137 errx(1, "%s: bad value", s); 138#undef MIN 139} 140 141static void 142in_status_tunnel(int s) 143{ 144 char src[NI_MAXHOST]; 145 char dst[NI_MAXHOST]; 146 struct ifreq ifr; 147 const struct sockaddr *sa = (const struct sockaddr *) &ifr.ifr_addr; 148 149 memset(&ifr, 0, sizeof(ifr)); 150 strncpy(ifr.ifr_name, name, IFNAMSIZ); 151 152 if (ioctl(s, SIOCGIFPSRCADDR, (caddr_t)&ifr) < 0) 153 return; 154 if (sa->sa_family != AF_INET) 155 return; 156 if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0, NI_NUMERICHOST) != 0) 157 src[0] = '\0'; 158 159 if (ioctl(s, SIOCGIFPDSTADDR, (caddr_t)&ifr) < 0) 160 return; 161 if (sa->sa_family != AF_INET) 162 return; 163 if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0, NI_NUMERICHOST) != 0) 164 dst[0] = '\0'; 165 166 printf("\ttunnel inet %s --> %s\n", src, dst); 167} 168 169static void 170in_set_tunnel(int s, struct addrinfo *srcres, struct addrinfo *dstres) 171{ 172 struct in_aliasreq addreq; 173 174 memset(&addreq, 0, sizeof(addreq)); 175 strncpy(addreq.ifra_name, name, IFNAMSIZ); 176 memcpy(&addreq.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len); 177 memcpy(&addreq.ifra_dstaddr, dstres->ai_addr, dstres->ai_addr->sa_len); 178 179 if (ioctl(s, SIOCSIFPHYADDR, &addreq) < 0) 180 warn("SIOCSIFPHYADDR"); 181} 182 183static struct afswtch af_inet = { 184 .af_name = "inet", 185 .af_af = AF_INET, 186 .af_status = in_status, 187 .af_getaddr = in_getaddr, 188 .af_status_tunnel = in_status_tunnel, 189 .af_settunnel = in_set_tunnel, 190 .af_difaddr = SIOCDIFADDR, 191 .af_aifaddr = SIOCAIFADDR, 192 .af_ridreq = &in_ridreq, 193 .af_addreq = &in_addreq, 194}; 195 196static __constructor void 197inet_ctor(void) 198{ 199 af_register(&af_inet); 200} 201