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carp.c revision 1.10 
      1 /* $NetBSD: carp.c,v 1.10 2008/07/02 07:44:14 dyoung Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2002 Michael Shalayeff. All rights reserved.
      5  * Copyright (c) 2003 Ryan McBride. All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
     20  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     21  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     22  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     24  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
     25  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     26  * THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 #ifndef lint
     31 __RCSID("$NetBSD: carp.c,v 1.10 2008/07/02 07:44:14 dyoung Exp $");
     32 #endif /* not lint */
     33 
     34 #include <sys/param.h>
     35 #include <sys/ioctl.h>
     36 #include <sys/socket.h>
     37 #include <sys/sockio.h>
     38 
     39 #include <net/if.h>
     40 #include <netinet/ip_carp.h>
     41 #include <net/route.h>
     42 
     43 #include <stdio.h>
     44 #include <string.h>
     45 #include <stdlib.h>
     46 #include <unistd.h>
     47 #include <err.h>
     48 #include <errno.h>
     49 #include <util.h>
     50 
     51 #include "env.h"
     52 #include "parse.h"
     53 #include "extern.h"
     54 
     55 static status_func_t status;
     56 static cmdloop_branch_t branch;
     57 
     58 static void carp_constructor(void) __attribute__((constructor));
     59 static void carp_status(prop_dictionary_t, prop_dictionary_t);
     60 static int setcarp_advbase(prop_dictionary_t, prop_dictionary_t);
     61 static int setcarp_advskew(prop_dictionary_t, prop_dictionary_t);
     62 static int setcarp_passwd(prop_dictionary_t, prop_dictionary_t);
     63 static int setcarp_vhid(prop_dictionary_t, prop_dictionary_t);
     64 static int setcarp_state(prop_dictionary_t, prop_dictionary_t);
     65 static int setcarpdev(prop_dictionary_t, prop_dictionary_t);
     66 
     67 static const char *carp_states[] = { CARP_STATES };
     68 
     69 struct kwinst carpstatekw[] = {
     70 	  {.k_word = "INIT", .k_nextparser = &command_root.pb_parser}
     71 	, {.k_word = "BACKUP", .k_nextparser = &command_root.pb_parser}
     72 	, {.k_word = "MASTER", .k_nextparser = &command_root.pb_parser}
     73 };
     74 
     75 struct pinteger parse_advbase = PINTEGER_INITIALIZER1(&parse_advbase, "advbase",
     76     0, 255, 10, setcarp_advbase, "advbase", &command_root.pb_parser);
     77 
     78 struct pinteger parse_advskew = PINTEGER_INITIALIZER1(&parse_advskew, "advskew",
     79     0, 254, 10, setcarp_advskew, "advskew", &command_root.pb_parser);
     80 
     81 struct piface carpdev = PIFACE_INITIALIZER(&carpdev, "carpdev", setcarpdev,
     82     "carpdev", &command_root.pb_parser);
     83 
     84 struct pkw carpstate = PKW_INITIALIZER(&carpstate, "carp state", setcarp_state,
     85     "carp_state", carpstatekw, __arraycount(carpstatekw),
     86     &command_root.pb_parser);
     87 
     88 struct pstr pass = PSTR_INITIALIZER(&pass, "pass", setcarp_passwd,
     89     "pass", &command_root.pb_parser);
     90 
     91 struct pinteger parse_vhid = PINTEGER_INITIALIZER1(&vhid, "vhid",
     92     0, 255, 10, setcarp_vhid, "vhid", &command_root.pb_parser);
     93 
     94 static const struct kwinst carpkw[] = {
     95 	  {.k_word = "advbase", .k_nextparser = &parse_advbase.pi_parser}
     96 	, {.k_word = "advskew", .k_nextparser = &parse_advskew.pi_parser}
     97 	, {.k_word = "carpdev", .k_nextparser = &carpdev.pif_parser}
     98 	, {.k_word = "-carpdev", .k_key = "carpdev", .k_type = KW_T_STR,
     99 	   .k_str = "", .k_exec = setcarpdev,
    100 	   .k_nextparser = &command_root.pb_parser}
    101 	, {.k_word = "pass", .k_nextparser = &pass.ps_parser}
    102 	, {.k_word = "state", .k_nextparser = &carpstate.pk_parser}
    103 	, {.k_word = "vhid", .k_nextparser = &parse_vhid.pi_parser}
    104 };
    105 
    106 struct pkw carp = PKW_INITIALIZER(&carp, "CARP", NULL, NULL,
    107     carpkw, __arraycount(carpkw), NULL);
    108 
    109 static void
    110 carp_set(prop_dictionary_t env, struct carpreq *carpr)
    111 {
    112 	if (indirect_ioctl(env, SIOCSVH, carpr) == -1)
    113 		err(EXIT_FAILURE, "SIOCSVH");
    114 }
    115 
    116 static int
    117 carp_get1(prop_dictionary_t env, struct carpreq *carpr)
    118 {
    119 	memset(carpr, 0, sizeof(*carpr));
    120 
    121 	return indirect_ioctl(env, SIOCGVH, carpr);
    122 }
    123 
    124 static void
    125 carp_get(prop_dictionary_t env, struct carpreq *carpr)
    126 {
    127 	if (carp_get1(env, carpr) == -1)
    128 		err(EXIT_FAILURE, "SIOCGVH");
    129 }
    130 
    131 static void
    132 carp_status(prop_dictionary_t env, prop_dictionary_t oenv)
    133 {
    134 	const char *state;
    135 	struct carpreq carpr;
    136 
    137 	if (carp_get1(env, &carpr) == -1)
    138 		return;
    139 
    140 	if (carpr.carpr_vhid <= 0)
    141 		return;
    142 	if (carpr.carpr_state > CARP_MAXSTATE)
    143 		state = "<UNKNOWN>";
    144 	else
    145 		state = carp_states[carpr.carpr_state];
    146 
    147 	printf("\tcarp: %s carpdev %s vhid %d advbase %d advskew %d\n",
    148 	    state, carpr.carpr_carpdev[0] != '\0' ?
    149 	    carpr.carpr_carpdev : "none", carpr.carpr_vhid,
    150 	    carpr.carpr_advbase, carpr.carpr_advskew);
    151 }
    152 
    153 int
    154 setcarp_passwd(prop_dictionary_t env, prop_dictionary_t xenv)
    155 {
    156 	struct carpreq carpr;
    157 	prop_data_t data;
    158 
    159 	data = (prop_data_t)prop_dictionary_get(env, "pass");
    160 	if (data == NULL) {
    161 		errno = ENOENT;
    162 		return -1;
    163 	}
    164 
    165 	carp_get(env, &carpr);
    166 
    167 	memset(carpr.carpr_key, 0, sizeof(carpr.carpr_key));
    168 	/* XXX Should hash the password into the key here, perhaps? */
    169 	strlcpy((char *)carpr.carpr_key, prop_data_data_nocopy(data),
    170 	    MIN(CARP_KEY_LEN, prop_data_size(data)));
    171 
    172 	carp_set(env, &carpr);
    173 	return 0;
    174 }
    175 
    176 int
    177 setcarp_vhid(prop_dictionary_t env, prop_dictionary_t xenv)
    178 {
    179 	struct carpreq carpr;
    180 	int64_t vhid;
    181 
    182 	if (!prop_dictionary_get_int64(env, "vhid", &vhid)) {
    183 		errno = ENOENT;
    184 		return -1;
    185 	}
    186 
    187 	carp_get(env, &carpr);
    188 
    189 	carpr.carpr_vhid = vhid;
    190 
    191 	carp_set(env, &carpr);
    192 	return 0;
    193 }
    194 
    195 int
    196 setcarp_advskew(prop_dictionary_t env, prop_dictionary_t xenv)
    197 {
    198 	struct carpreq carpr;
    199 	int64_t advskew;
    200 
    201 	if (!prop_dictionary_get_int64(env, "advskew", &advskew)) {
    202 		errno = ENOENT;
    203 		return -1;
    204 	}
    205 
    206 	carp_get(env, &carpr);
    207 
    208 	carpr.carpr_advskew = advskew;
    209 
    210 	carp_set(env, &carpr);
    211 	return 0;
    212 }
    213 
    214 /* ARGSUSED */
    215 int
    216 setcarp_advbase(prop_dictionary_t env, prop_dictionary_t xenv)
    217 {
    218 	struct carpreq carpr;
    219 	int64_t advbase;
    220 
    221 	if (!prop_dictionary_get_int64(env, "advbase", &advbase)) {
    222 		errno = ENOENT;
    223 		return -1;
    224 	}
    225 
    226 	carp_get(env, &carpr);
    227 
    228 	carpr.carpr_advbase = advbase;
    229 
    230 	carp_set(env, &carpr);
    231 	return 0;
    232 }
    233 
    234 /* ARGSUSED */
    235 static int
    236 setcarp_state(prop_dictionary_t env, prop_dictionary_t xenv)
    237 {
    238 	struct carpreq carpr;
    239 	int64_t carp_state;
    240 
    241 	if (!prop_dictionary_get_int64(env, "carp_state", &carp_state)) {
    242 		errno = ENOENT;
    243 		return -1;
    244 	}
    245 
    246 	carp_get(env, &carpr);
    247 
    248 	carpr.carpr_state = carp_state;
    249 
    250 	carp_set(env, &carpr);
    251 	return 0;
    252 }
    253 
    254 /* ARGSUSED */
    255 int
    256 setcarpdev(prop_dictionary_t env, prop_dictionary_t xenv)
    257 {
    258 	struct carpreq carpr;
    259 	prop_data_t data;
    260 
    261 	data = (prop_data_t)prop_dictionary_get(env, "carpdev");
    262 	if (data == NULL) {
    263 		errno = ENOENT;
    264 		return -1;
    265 	}
    266 
    267 	carp_get(env, &carpr);
    268 
    269 	strlcpy(carpr.carpr_carpdev, prop_data_data_nocopy(data),
    270 	    MIN(sizeof(carpr.carpr_carpdev), prop_data_size(data)));
    271 
    272 	carp_set(env, &carpr);
    273 	return 0;
    274 }
    275 
    276 static void
    277 carp_constructor(void)
    278 {
    279 	cmdloop_branch_init(&branch, &carp.pk_parser);
    280 	register_cmdloop_branch(&branch);
    281 	status_func_init(&status, carp_status);
    282 	register_status(&status);
    283 }
    284