1 /* $FreeBSD$ */ 2 /* from $OpenBSD: ifconfig.c,v 1.82 2003/10/19 05:43:35 mcbride Exp $ */ 3 4 /*- 5 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 6 * 7 * Copyright (c) 2002 Michael Shalayeff. All rights reserved. 8 * Copyright (c) 2003 Ryan McBride. All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 25 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 27 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 28 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 29 * THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/param.h> 33 #include <sys/ioctl.h> 34 #include <sys/socket.h> 35 #include <sys/sockio.h> 36 37 #include <stdlib.h> 38 #include <unistd.h> 39 40 #include <net/if.h> 41 #include <netinet/in.h> 42 #include <netinet/in_var.h> 43 #include <netinet/ip_carp.h> 44 45 #include <arpa/inet.h> 46 47 #include <ctype.h> 48 #include <stdbool.h> 49 #include <stdio.h> 50 #include <string.h> 51 #include <stdlib.h> 52 #include <unistd.h> 53 #include <err.h> 54 #include <errno.h> 55 #include <netdb.h> 56 57 #include <libifconfig.h> 58 59 #include "ifconfig.h" 60 61 static const char *carp_states[] = { CARP_STATES }; 62 63 static void carp_status(int s); 64 static void setcarp_vhid(const char *, int, int, const struct afswtch *rafp); 65 static void setcarp_callback(int, void *); 66 static void setcarp_advbase(const char *,int, int, const struct afswtch *rafp); 67 static void setcarp_advskew(const char *, int, int, const struct afswtch *rafp); 68 static void setcarp_passwd(const char *, int, int, const struct afswtch *rafp); 69 70 static int carpr_vhid = -1; 71 static int carpr_advskew = -1; 72 static int carpr_advbase = -1; 73 static int carpr_state = -1; 74 static struct in_addr carp_addr; 75 static struct in6_addr carp_addr6; 76 static unsigned char const *carpr_key; 77 78 static void 79 carp_status(int s) 80 { 81 struct ifconfig_carp carpr[CARP_MAXVHID]; 82 char addr_buf[NI_MAXHOST]; 83 84 if (ifconfig_carp_get_info(lifh, name, carpr, CARP_MAXVHID) == -1) 85 return; 86 87 for (size_t i = 0; i < carpr[0].carpr_count; i++) { 88 printf("\tcarp: %s vhid %d advbase %d advskew %d", 89 carp_states[carpr[i].carpr_state], carpr[i].carpr_vhid, 90 carpr[i].carpr_advbase, carpr[i].carpr_advskew); 91 if (printkeys && carpr[i].carpr_key[0] != '\0') 92 printf(" key \"%s\"\n", carpr[i].carpr_key); 93 else 94 printf("\n"); 95 96 inet_ntop(AF_INET6, &carpr[i].carpr_addr6, addr_buf, 97 sizeof(addr_buf)); 98 99 printf("\t peer %s peer6 %s\n", 100 inet_ntoa(carpr[i].carpr_addr), addr_buf); 101 } 102 } 103 104 static void 105 setcarp_vhid(const char *val, int d, int s, const struct afswtch *afp) 106 { 107 108 carpr_vhid = atoi(val); 109 110 if (carpr_vhid <= 0 || carpr_vhid > CARP_MAXVHID) 111 errx(1, "vhid must be greater than 0 and less than %u", 112 CARP_MAXVHID); 113 114 switch (afp->af_af) { 115 #ifdef INET 116 case AF_INET: 117 { 118 struct in_aliasreq *ifra; 119 120 ifra = (struct in_aliasreq *)afp->af_addreq; 121 ifra->ifra_vhid = carpr_vhid; 122 break; 123 } 124 #endif 125 #ifdef INET6 126 case AF_INET6: 127 { 128 struct in6_aliasreq *ifra; 129 130 ifra = (struct in6_aliasreq *)afp->af_addreq; 131 ifra->ifra_vhid = carpr_vhid; 132 break; 133 } 134 #endif 135 default: 136 errx(1, "%s doesn't support carp(4)", afp->af_name); 137 } 138 139 callback_register(setcarp_callback, NULL); 140 } 141 142 static void 143 setcarp_callback(int s, void *arg __unused) 144 { 145 struct ifconfig_carp carpr = { }; 146 147 if (ifconfig_carp_get_vhid(lifh, name, &carpr, carpr_vhid) == -1) { 148 if (ifconfig_err_errno(lifh) != ENOENT) 149 return; 150 } 151 152 carpr.carpr_vhid = carpr_vhid; 153 if (carpr_key != NULL) 154 /* XXX Should hash the password into the key here? */ 155 strlcpy(carpr.carpr_key, carpr_key, CARP_KEY_LEN); 156 if (carpr_advskew > -1) 157 carpr.carpr_advskew = carpr_advskew; 158 if (carpr_advbase > -1) 159 carpr.carpr_advbase = carpr_advbase; 160 if (carpr_state > -1) 161 carpr.carpr_state = carpr_state; 162 if (carp_addr.s_addr != INADDR_ANY) 163 carpr.carpr_addr = carp_addr; 164 if (! IN6_IS_ADDR_UNSPECIFIED(&carp_addr6)) 165 memcpy(&carpr.carpr_addr6, &carp_addr6, 166 sizeof(carp_addr6)); 167 168 if (ifconfig_carp_set_info(lifh, name, &carpr)) 169 err(1, "SIOCSVH"); 170 } 171 172 static void 173 setcarp_passwd(const char *val, int d, int s, const struct afswtch *afp) 174 { 175 176 if (carpr_vhid == -1) 177 errx(1, "passwd requires vhid"); 178 179 carpr_key = val; 180 } 181 182 static void 183 setcarp_advskew(const char *val, int d, int s, const struct afswtch *afp) 184 { 185 186 if (carpr_vhid == -1) 187 errx(1, "advskew requires vhid"); 188 189 carpr_advskew = atoi(val); 190 } 191 192 static void 193 setcarp_advbase(const char *val, int d, int s, const struct afswtch *afp) 194 { 195 196 if (carpr_vhid == -1) 197 errx(1, "advbase requires vhid"); 198 199 carpr_advbase = atoi(val); 200 } 201 202 static void 203 setcarp_state(const char *val, int d, int s, const struct afswtch *afp) 204 { 205 int i; 206 207 if (carpr_vhid == -1) 208 errx(1, "state requires vhid"); 209 210 for (i = 0; i <= CARP_MAXSTATE; i++) 211 if (strcasecmp(carp_states[i], val) == 0) { 212 carpr_state = i; 213 return; 214 } 215 216 errx(1, "unknown state"); 217 } 218 219 static void 220 setcarp_peer(const char *val, int d, int s, const struct afswtch *afp) 221 { 222 carp_addr.s_addr = inet_addr(val); 223 } 224 225 static void 226 setcarp_mcast(const char *val, int d, int s, const struct afswtch *afp) 227 { 228 carp_addr.s_addr = htonl(INADDR_CARP_GROUP); 229 } 230 231 static void 232 setcarp_peer6(const char *val, int d, int s, const struct afswtch *afp) 233 { 234 struct addrinfo hints, *res; 235 236 memset(&hints, 0, sizeof(hints)); 237 hints.ai_family = AF_INET6; 238 hints.ai_flags = AI_NUMERICHOST; 239 240 if (getaddrinfo(val, NULL, &hints, &res) == 1) 241 errx(1, "Invalid IPv6 address %s", val); 242 243 memcpy(&carp_addr6, &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr, 244 sizeof(carp_addr6)); 245 freeaddrinfo(res); 246 } 247 248 static void 249 setcarp_mcast6(const char *val, int d, int s, const struct afswtch *afp) 250 { 251 bzero(&carp_addr6, sizeof(carp_addr6)); 252 carp_addr6.s6_addr[0] = 0xff; 253 carp_addr6.s6_addr[1] = 0x02; 254 carp_addr6.s6_addr[15] = 0x12; 255 } 256 257 static struct cmd carp_cmds[] = { 258 DEF_CMD_ARG("advbase", setcarp_advbase), 259 DEF_CMD_ARG("advskew", setcarp_advskew), 260 DEF_CMD_ARG("pass", setcarp_passwd), 261 DEF_CMD_ARG("vhid", setcarp_vhid), 262 DEF_CMD_ARG("state", setcarp_state), 263 DEF_CMD_ARG("peer", setcarp_peer), 264 DEF_CMD("mcast", 0, setcarp_mcast), 265 DEF_CMD_ARG("peer6", setcarp_peer6), 266 DEF_CMD("mcast6", 0, setcarp_mcast6), 267 }; 268 static struct afswtch af_carp = { 269 .af_name = "af_carp", 270 .af_af = AF_UNSPEC, 271 .af_other_status = carp_status, 272 }; 273 274 static __constructor void 275 carp_ctor(void) 276 { 277 int i; 278 279 /* Default to multicast. */ 280 setcarp_mcast(NULL, 0, 0, NULL); 281 setcarp_mcast6(NULL, 0, 0, NULL); 282 283 for (i = 0; i < nitems(carp_cmds); i++) 284 cmd_register(&carp_cmds[i]); 285 af_register(&af_carp); 286 } 287