carp.c revision 272461
1/* $FreeBSD: releng/10.1/sbin/ifconfig/carp.c 228577 2011-12-16 14:30:58Z glebius $ */ 2/* from $OpenBSD: ifconfig.c,v 1.82 2003/10/19 05:43:35 mcbride Exp $ */ 3 4/* 5 * Copyright (c) 2002 Michael Shalayeff. All rights reserved. 6 * Copyright (c) 2003 Ryan McBride. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 27 * THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30#include <sys/param.h> 31#include <sys/ioctl.h> 32#include <sys/socket.h> 33#include <sys/sockio.h> 34 35#include <stdlib.h> 36#include <unistd.h> 37 38#include <net/if.h> 39#include <net/if_var.h> 40#include <netinet/in.h> 41#include <netinet/in_var.h> 42#include <netinet/ip_carp.h> 43 44#include <ctype.h> 45#include <stdio.h> 46#include <string.h> 47#include <stdlib.h> 48#include <unistd.h> 49#include <err.h> 50#include <errno.h> 51 52#include "ifconfig.h" 53 54static const char *carp_states[] = { CARP_STATES }; 55 56static void carp_status(int s); 57static void setcarp_vhid(const char *, int, int, const struct afswtch *rafp); 58static void setcarp_callback(int, void *); 59static void setcarp_advbase(const char *,int, int, const struct afswtch *rafp); 60static void setcarp_advskew(const char *, int, int, const struct afswtch *rafp); 61static void setcarp_passwd(const char *, int, int, const struct afswtch *rafp); 62 63static int carpr_vhid = -1; 64static int carpr_advskew = -1; 65static int carpr_advbase = -1; 66static int carpr_state = -1; 67static unsigned char const *carpr_key; 68 69static void 70carp_status(int s) 71{ 72 struct carpreq carpr[CARP_MAXVHID]; 73 int i; 74 75 bzero(carpr, sizeof(struct carpreq) * CARP_MAXVHID); 76 carpr[0].carpr_count = CARP_MAXVHID; 77 ifr.ifr_data = (caddr_t)&carpr; 78 79 if (ioctl(s, SIOCGVH, (caddr_t)&ifr) == -1) 80 return; 81 82 for (i = 0; i < carpr[0].carpr_count; i++) { 83 printf("\tcarp: %s vhid %d advbase %d advskew %d", 84 carp_states[carpr[i].carpr_state], carpr[i].carpr_vhid, 85 carpr[i].carpr_advbase, carpr[i].carpr_advskew); 86 if (printkeys && carpr[i].carpr_key[0] != '\0') 87 printf(" key \"%s\"\n", carpr[i].carpr_key); 88 else 89 printf("\n"); 90 } 91} 92 93static void 94setcarp_vhid(const char *val, int d, int s, const struct afswtch *afp) 95{ 96 97 carpr_vhid = atoi(val); 98 99 if (carpr_vhid <= 0 || carpr_vhid > CARP_MAXVHID) 100 errx(1, "vhid must be greater than 0 and less than %u", 101 CARP_MAXVHID); 102 103 switch (afp->af_af) { 104#ifdef INET 105 case AF_INET: 106 { 107 struct in_aliasreq *ifra; 108 109 ifra = (struct in_aliasreq *)afp->af_addreq; 110 ifra->ifra_vhid = carpr_vhid; 111 break; 112 } 113#endif 114#ifdef INET6 115 case AF_INET6: 116 { 117 struct in6_aliasreq *ifra; 118 119 ifra = (struct in6_aliasreq *)afp->af_addreq; 120 ifra->ifra_vhid = carpr_vhid; 121 break; 122 } 123#endif 124 default: 125 errx(1, "%s doesn't support carp(4)", afp->af_name); 126 } 127 128 callback_register(setcarp_callback, NULL); 129} 130 131static void 132setcarp_callback(int s, void *arg __unused) 133{ 134 struct carpreq carpr; 135 136 bzero(&carpr, sizeof(struct carpreq)); 137 carpr.carpr_vhid = carpr_vhid; 138 carpr.carpr_count = 1; 139 ifr.ifr_data = (caddr_t)&carpr; 140 141 if (ioctl(s, SIOCGVH, (caddr_t)&ifr) == -1 && errno != ENOENT) 142 err(1, "SIOCGVH"); 143 144 if (carpr_key != NULL) 145 /* XXX Should hash the password into the key here? */ 146 strlcpy(carpr.carpr_key, carpr_key, CARP_KEY_LEN); 147 if (carpr_advskew > -1) 148 carpr.carpr_advskew = carpr_advskew; 149 if (carpr_advbase > -1) 150 carpr.carpr_advbase = carpr_advbase; 151 if (carpr_state > -1) 152 carpr.carpr_state = carpr_state; 153 154 if (ioctl(s, SIOCSVH, (caddr_t)&ifr) == -1) 155 err(1, "SIOCSVH"); 156} 157 158static void 159setcarp_passwd(const char *val, int d, int s, const struct afswtch *afp) 160{ 161 162 if (carpr_vhid == -1) 163 errx(1, "passwd requires vhid"); 164 165 carpr_key = val; 166} 167 168static void 169setcarp_advskew(const char *val, int d, int s, const struct afswtch *afp) 170{ 171 172 if (carpr_vhid == -1) 173 errx(1, "advskew requires vhid"); 174 175 carpr_advskew = atoi(val); 176} 177 178static void 179setcarp_advbase(const char *val, int d, int s, const struct afswtch *afp) 180{ 181 182 if (carpr_vhid == -1) 183 errx(1, "advbase requires vhid"); 184 185 carpr_advbase = atoi(val); 186} 187 188static void 189setcarp_state(const char *val, int d, int s, const struct afswtch *afp) 190{ 191 int i; 192 193 if (carpr_vhid == -1) 194 errx(1, "state requires vhid"); 195 196 for (i = 0; i <= CARP_MAXSTATE; i++) 197 if (strcasecmp(carp_states[i], val) == 0) { 198 carpr_state = i; 199 return; 200 } 201 202 errx(1, "unknown state"); 203} 204 205static struct cmd carp_cmds[] = { 206 DEF_CMD_ARG("advbase", setcarp_advbase), 207 DEF_CMD_ARG("advskew", setcarp_advskew), 208 DEF_CMD_ARG("pass", setcarp_passwd), 209 DEF_CMD_ARG("vhid", setcarp_vhid), 210 DEF_CMD_ARG("state", setcarp_state), 211}; 212static struct afswtch af_carp = { 213 .af_name = "af_carp", 214 .af_af = AF_UNSPEC, 215 .af_other_status = carp_status, 216}; 217 218static __constructor void 219carp_ctor(void) 220{ 221#define N(a) (sizeof(a) / sizeof(a[0])) 222 int i; 223 224 for (i = 0; i < N(carp_cmds); i++) 225 cmd_register(&carp_cmds[i]); 226 af_register(&af_carp); 227#undef N 228} 229