/
dhcp6c.c
1907 lines (1658 loc) · 46.5 KB
/
dhcp6c.c
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/* $KAME: dhcp6c.c,v 1.164 2006/01/10 02:46:09 jinmei Exp $ */
/*
* Copyright (C) 1998 and 1999 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/queue.h>
#include <errno.h>
#include <limits.h>
#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# else
# include <time.h>
# endif
#endif
#include <net/if.h>
#ifdef __FreeBSD__
#include <net/if_var.h>
#endif
#include <netinet/in.h>
#ifdef __KAME__
#include <net/if_dl.h>
#include <netinet6/in6_var.h>
#endif
#include <arpa/inet.h>
#include <netdb.h>
#include <signal.h>
#include <stdio.h>
#include <stdarg.h>
#include <syslog.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <err.h>
#include <ifaddrs.h>
#include <fcntl.h>
#include "dhcp6.h"
#include "config.h"
#include "common.h"
#include "timer.h"
#include "dhcp6c.h"
#include "dhcp6c_ia.h"
#include "prefixconf.h"
#include "auth.h"
static int debug = 0;
static int exit_ok = 0;
static sig_atomic_t sig_flags = 0;
#define SIGF_TERM 0x1
#define SIGF_HUP 0x2
#define SIGF_USR1 0x4
const dhcp6_mode_t dhcp6_mode = DHCP6_MODE_CLIENT;
static int sock; /* inbound/outbound udp port */
#define CTLSKEW 300
static const char *conffile = DHCP6C_CONF;
static const struct sockaddr_in6 *sa6_allagent;
static struct duid client_duid;
static const char *pid_file = DHCP6C_PIDFILE;
static struct keyinfo *ctlkey = NULL;
static int ctldigestlen;
static int infreq_mode = 0;
int opt_norelease;
static void usage(void);
static void client6_init(void);
static void client6_startall(int);
static void free_resources(struct dhcp6_if *);
static void client6_mainloop(void);
static void check_exit(void);
static void process_signals(void);
static struct dhcp6_serverinfo *find_server(struct dhcp6_event *,
struct duid *);
static struct dhcp6_serverinfo *select_server(struct dhcp6_event *);
static void client6_recv(void);
static int client6_recvadvert(struct dhcp6_if *, struct dhcp6 *,
ssize_t, struct dhcp6_optinfo *);
static int client6_recvreply(struct dhcp6_if *, struct dhcp6 *,
ssize_t, struct dhcp6_optinfo *);
static void client6_signal(int);
static struct dhcp6_event *find_event_withid(struct dhcp6_if *,
uint32_t);
static int construct_confdata(struct dhcp6_if *, struct dhcp6_event *);
static int construct_reqdata(struct dhcp6_if *, struct dhcp6_optinfo *,
struct dhcp6_event *);
static void destruct_iadata(struct dhcp6_eventdata *);
static void tv_sub(struct timeval *, struct timeval *, struct timeval *);
static struct dhcp6_timer *client6_expire_refreshtime(void *);
static int process_auth(struct authparam *, struct dhcp6 *dh6, ssize_t,
struct dhcp6_optinfo *);
static int set_auth(struct dhcp6_event *, struct dhcp6_optinfo *);
struct dhcp6_timer *client6_timo(void *);
int client6_start(struct dhcp6_if *);
static void info_printf(const char *, ...);
#define MAX_ELAPSED_TIME 0xffff
int
main(int argc, char *argv[])
{
int ch, pid;
char *progname;
FILE *pidfp;
struct dhcp6_if *ifp;
#ifndef HAVE_ARC4RANDOM
srandom(time(NULL) & getpid());
#endif
if ((progname = strrchr(*argv, '/')) == NULL)
progname = *argv;
else
progname++;
while ((ch = getopt(argc, argv, "c:dDfinp:")) != -1) {
switch (ch) {
case 'c':
conffile = optarg;
break;
case 'd':
debug = 1;
break;
case 'D':
debug = 2;
break;
case 'f':
foreground++;
break;
case 'i':
infreq_mode = 1;
break;
case 'n':
opt_norelease = 1;
break;
case 'p':
pid_file = optarg;
break;
default:
usage();
exit(0);
}
}
argc -= optind;
argv += optind;
if (argc == 0) {
usage();
exit(0);
}
if (foreground == 0)
openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
setloglevel(debug);
client6_init();
while (argc-- > 0) {
if ((ifp = ifinit(argv[0])) == NULL) {
d_printf(LOG_ERR, FNAME, "failed to initialize %s",
argv[0]);
exit(1);
}
argv++;
}
if (infreq_mode == 0 && (cfparse(conffile)) != 0) {
d_printf(LOG_ERR, FNAME, "failed to parse configuration file");
exit(1);
}
if (foreground == 0 && infreq_mode == 0) {
if (daemon(0, 0) < 0)
err(1, "daemon");
}
/* dump current PID */
pid = getpid();
if ((pidfp = fopen(pid_file, "w")) != NULL) {
fprintf(pidfp, "%d\n", pid);
fclose(pidfp);
}
client6_startall(0);
client6_mainloop();
exit(0);
}
static void
usage()
{
fprintf(stderr, "usage: dhcp6c [-c configfile] [-dDfin] "
"[-p pid-file] interface [interfaces...]\n");
}
/*------------------------------------------------------------*/
void
client6_init(void)
{
struct addrinfo hints, *res;
static struct sockaddr_in6 sa6_allagent_storage;
int error, on = 0;
/* get our DUID */
if (get_duid(DUID_FILE, &client_duid)) {
d_printf(LOG_ERR, FNAME, "failed to get a DUID");
exit(1);
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_INET6;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
hints.ai_flags = AI_PASSIVE;
error = getaddrinfo(NULL, DH6PORT_DOWNSTREAM, &hints, &res);
if (error) {
d_printf(LOG_ERR, FNAME, "getaddrinfo: %s",
gai_strerror(error));
exit(1);
}
sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (sock < 0) {
d_printf(LOG_ERR, FNAME, "socket");
exit(1);
}
if ((on = fcntl(sock, F_GETFL, 0)) == -1) {
d_printf(LOG_ERR, FNAME, "fctnl getflags");
exit(1);
}
on |= FD_CLOEXEC;
if ((on = fcntl(sock, F_SETFL, on)) == -1) {
d_printf(LOG_ERR, FNAME, "fctnl setflags");
exit(1);
}
on = 1;
if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
&on, sizeof(on)) < 0) {
d_printf(LOG_ERR, FNAME,
"setsockopt(SO_REUSEPORT): %s", strerror(errno));
exit(1);
}
#ifdef IPV6_RECVPKTINFO
if (setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
sizeof(on)) < 0) {
d_printf(LOG_ERR, FNAME,
"setsockopt(IPV6_RECVPKTINFO): %s",
strerror(errno));
exit(1);
}
#else
if (setsockopt(sock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
sizeof(on)) < 0) {
d_printf(LOG_ERR, FNAME,
"setsockopt(IPV6_PKTINFO): %s",
strerror(errno));
exit(1);
}
#endif
if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &on,
sizeof(on)) < 0) {
d_printf(LOG_ERR, FNAME,
"setsockopt(sock, IPV6_MULTICAST_LOOP): %s",
strerror(errno));
exit(1);
}
#ifdef IPV6_V6ONLY
if (setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
&on, sizeof(on)) < 0) {
d_printf(LOG_ERR, FNAME, "setsockopt(IPV6_V6ONLY): %s",
strerror(errno));
exit(1);
}
#endif
/*
* According RFC3315 2.2, only the incoming port should be bound to UDP
* port 546. However, to have an interoperability with some servers,
* the outgoing port is also bound to the DH6PORT_DOWNSTREAM.
*/
if (bind(sock, res->ai_addr, res->ai_addrlen) < 0) {
d_printf(LOG_ERR, FNAME, "bind: %s", strerror(errno));
exit(1);
}
freeaddrinfo(res);
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_INET6;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
error = getaddrinfo(DH6ADDR_ALLAGENT, DH6PORT_UPSTREAM, &hints, &res);
if (error) {
d_printf(LOG_ERR, FNAME, "getaddrinfo: %s",
gai_strerror(error));
exit(1);
}
memcpy(&sa6_allagent_storage, res->ai_addr, res->ai_addrlen);
sa6_allagent = (const struct sockaddr_in6 *)&sa6_allagent_storage;
freeaddrinfo(res);
if (signal(SIGHUP, client6_signal) == SIG_ERR) {
d_printf(LOG_WARNING, FNAME, "failed to set signal: %s",
strerror(errno));
exit(1);
}
if (signal(SIGTERM, client6_signal) == SIG_ERR) {
d_printf(LOG_WARNING, FNAME, "failed to set signal: %s",
strerror(errno));
exit(1);
}
if (signal(SIGUSR1, client6_signal) == SIG_ERR) {
d_printf(LOG_WARNING, FNAME, "failed to set signal: %s",
strerror(errno));
exit(1);
}
}
int
client6_start(struct dhcp6_if *ifp)
{
struct dhcp6_event *ev;
/* make sure that the interface does not have a timer */
if (ifp->timer != NULL) {
d_printf(LOG_DEBUG, FNAME,
"removed existing timer on %s", ifp->ifname);
dhcp6_remove_timer(&ifp->timer);
}
/* create an event for the initial delay */
if ((ev = dhcp6_create_event(ifp, DHCP6S_INIT)) == NULL) {
d_printf(LOG_NOTICE, FNAME, "failed to create an event");
return (-1);
}
TAILQ_INSERT_TAIL(&ifp->event_list, ev, link);
if ((ev->authparam = new_authparam(ifp->authproto,
ifp->authalgorithm, ifp->authrdm)) == NULL) {
d_printf(LOG_WARNING, FNAME, "failed to allocate "
"authentication parameters");
dhcp6_remove_event(ev);
return (-1);
}
if ((ev->timer = dhcp6_add_timer(client6_timo, ev)) == NULL) {
d_printf(LOG_NOTICE, FNAME, "failed to add a timer for %s",
ifp->ifname);
dhcp6_remove_event(ev);
return (-1);
}
dhcp6_reset_timer(ev);
return (0);
}
static void
client6_startall(int isrestart)
{
struct dhcp6_if *ifp;
for (ifp = dhcp6_if; ifp; ifp = ifp->next) {
if (isrestart &&ifreset(ifp)) {
d_printf(LOG_NOTICE, FNAME, "failed to reset %s",
ifp->ifname);
continue; /* XXX: try to recover? */
}
if (client6_start(ifp))
exit(1); /* initialization failure. we give up. */
}
}
static void
free_resources(struct dhcp6_if *freeifp)
{
struct dhcp6_if *ifp;
for (ifp = dhcp6_if; ifp; ifp = ifp->next) {
struct dhcp6_event *ev, *ev_next;
if (freeifp != NULL && freeifp != ifp)
continue;
/* release all IAs as well as send RELEASE message(s) */
release_all_ia(ifp);
/*
* Cancel all outstanding events for each interface except
* ones being released.
*/
for (ev = TAILQ_FIRST(&ifp->event_list); ev; ev = ev_next) {
ev_next = TAILQ_NEXT(ev, link);
if (ev->state == DHCP6S_RELEASE)
continue; /* keep it for now */
dhcp6_remove_event(ev);
}
}
}
static void
check_exit(void)
{
struct dhcp6_if *ifp;
if (!exit_ok)
return;
for (ifp = dhcp6_if; ifp; ifp = ifp->next) {
/*
* Check if we have an outstanding event. If we do, we cannot
* exit for now.
*/
if (!TAILQ_EMPTY(&ifp->event_list))
return;
}
for (ifp = dhcp6_if; ifp; ifp = ifp->next)
client6_script(ifp->scriptpath, DHCP6S_EXIT, NULL);
/* We have no existing event. Do exit. */
d_printf(LOG_INFO, FNAME, "exiting");
unlink(pid_file);
exit(0);
}
static void
process_signals(void)
{
if ((sig_flags & SIGF_TERM)) {
exit_ok = 1;
free_resources(NULL);
check_exit();
}
if ((sig_flags & SIGF_HUP)) {
d_printf(LOG_INFO, FNAME, "restarting");
free_resources(NULL);
if (cfparse(conffile) != 0) {
d_printf(LOG_WARNING, FNAME,
"failed to reload configuration file");
}
client6_startall(1);
}
if ((sig_flags & SIGF_USR1)) {
d_printf(LOG_INFO, FNAME, "exit without release");
exit_ok = 1;
opt_norelease = 1;
free_resources(NULL);
check_exit();
}
sig_flags = 0;
}
static void
client6_mainloop(void)
{
struct timeval *w;
int ret, maxsock;
fd_set r;
while(1) {
if (sig_flags)
process_signals();
w = dhcp6_check_timer();
FD_ZERO(&r);
FD_SET(sock, &r);
maxsock = sock;
ret = select(maxsock + 1, &r, NULL, NULL, w);
switch (ret) {
case -1:
if (errno != EINTR) {
d_printf(LOG_ERR, FNAME, "select: %s",
strerror(errno));
exit(1);
}
continue;
case 0: /* timeout */
break; /* dhcp6_check_timer() will treat the case */
default:
break;
}
if (FD_ISSET(sock, &r))
client6_recv();
}
}
static inline int
get_ifname(char **bpp, int *lenp, char *ifbuf, int ifbuflen)
{
char *bp = *bpp;
int len = *lenp, ifnamelen;
uint32_t i32;
if (get_val32(bpp, lenp, &i32))
return (-1);
ifnamelen = (int)i32;
if (*lenp < ifnamelen || ifnamelen > ifbuflen)
return (-1);
memset(ifbuf, 0, ifbuflen);
memcpy(ifbuf, *bpp, ifnamelen);
if (ifbuf[ifbuflen - 1] != '\0')
return (-1); /* not null terminated */
*bpp = bp + sizeof(i32) + ifnamelen;
*lenp = len - (sizeof(i32) + ifnamelen);
return (0);
}
static struct dhcp6_timer *
client6_expire_refreshtime(void *arg)
{
struct dhcp6_if *ifp = arg;
d_printf(LOG_DEBUG, FNAME,
"information refresh time on %s expired", ifp->ifname);
dhcp6_remove_timer(&ifp->timer);
client6_start(ifp);
return (NULL);
}
struct dhcp6_timer *
client6_timo(void *arg)
{
struct dhcp6_event *ev = (struct dhcp6_event *)arg;
struct dhcp6_if *ifp;
int state = ev->state;
ifp = ev->ifp;
ev->timeouts++;
/*
* Unless MRC is zero, the message exchange fails once the client has
* transmitted the message MRC times.
* [RFC3315 14.]
*/
if (ev->max_retrans_cnt && ev->timeouts >= ev->max_retrans_cnt) {
d_printf(LOG_INFO, FNAME, "no responses were received");
dhcp6_remove_event(ev);
if (state == DHCP6S_RELEASE)
check_exit();
return (NULL);
}
switch(ev->state) {
case DHCP6S_INIT:
ev->timeouts = 0; /* indicate to generate a new XID. */
if ((ifp->send_flags & DHCIFF_INFO_ONLY) || infreq_mode)
ev->state = DHCP6S_INFOREQ;
else {
ev->state = DHCP6S_SOLICIT;
if (construct_confdata(ifp, ev)) {
d_printf(LOG_ERR, FNAME, "can't send solicit");
exit(1); /* XXX */
}
}
dhcp6_set_timeoparam(ev); /* XXX */
/* fall through */
case DHCP6S_REQUEST:
case DHCP6S_RELEASE:
case DHCP6S_INFOREQ:
client6_send(ev);
break;
case DHCP6S_RENEW:
case DHCP6S_REBIND:
if (!TAILQ_EMPTY(&ev->data_list))
client6_send(ev);
else {
d_printf(LOG_INFO, FNAME,
"all information to be updated was canceled");
dhcp6_remove_event(ev);
return (NULL);
}
break;
case DHCP6S_SOLICIT:
if (ev->servers) {
/*
* Send a Request to the best server.
* Note that when we set Rapid-commit in Solicit,
* but a direct Reply has been delayed (very much),
* the transition to DHCP6S_REQUEST (and the change of
* transaction ID) will invalidate the reply even if it
* ever arrives.
*/
ev->current_server = select_server(ev);
if (ev->current_server == NULL) {
/* this should not happen! */
d_printf(LOG_NOTICE, FNAME,
"can't find a server");
exit(1); /* XXX */
}
if (duidcpy(&ev->serverid,
&ev->current_server->optinfo.serverID)) {
d_printf(LOG_NOTICE, FNAME,
"can't copy server ID");
return (NULL); /* XXX: better recovery? */
}
ev->timeouts = 0;
ev->state = DHCP6S_REQUEST;
dhcp6_set_timeoparam(ev);
if (ev->authparam != NULL)
free(ev->authparam);
ev->authparam = ev->current_server->authparam;
ev->current_server->authparam = NULL;
if (construct_reqdata(ifp,
&ev->current_server->optinfo, ev)) {
d_printf(LOG_NOTICE, FNAME,
"failed to construct request data");
break;
}
}
client6_send(ev);
break;
}
dhcp6_reset_timer(ev);
return (ev->timer);
}
static int
construct_confdata(struct dhcp6_if *ifp, struct dhcp6_event *ev)
{
struct ia_conf *iac;
struct dhcp6_eventdata *evd = NULL;
struct dhcp6_list *ial = NULL, pl;
struct dhcp6_ia iaparam;
TAILQ_INIT(&pl); /* for safety */
for (iac = TAILQ_FIRST(&ifp->iaconf_list); iac;
iac = TAILQ_NEXT(iac, link)) {
/* ignore IA config currently used */
if (!TAILQ_EMPTY(&iac->iadata))
continue;
evd = NULL;
if ((evd = malloc(sizeof(*evd))) == NULL) {
d_printf(LOG_NOTICE, FNAME,
"failed to create a new event data");
goto fail;
}
memset(evd, 0, sizeof(*evd));
memset(&iaparam, 0, sizeof(iaparam));
iaparam.iaid = iac->iaid;
switch (iac->type) {
case IATYPE_PD:
ial = NULL;
if ((ial = malloc(sizeof(*ial))) == NULL)
goto fail;
TAILQ_INIT(ial);
TAILQ_INIT(&pl);
dhcp6_copy_list(&pl,
&((struct iapd_conf *)iac)->iapd_prefix_list);
if (dhcp6_add_listval(ial, DHCP6_LISTVAL_IAPD,
&iaparam, &pl) == NULL) {
goto fail;
}
dhcp6_clear_list(&pl);
evd->type = DHCP6_EVDATA_IAPD;
evd->data = ial;
evd->event = ev;
evd->destructor = destruct_iadata;
TAILQ_INSERT_TAIL(&ev->data_list, evd, link);
break;
case IATYPE_NA:
ial = NULL;
if ((ial = malloc(sizeof(*ial))) == NULL)
goto fail;
TAILQ_INIT(ial);
TAILQ_INIT(&pl);
dhcp6_copy_list(&pl,
&((struct iana_conf *)iac)->iana_address_list);
if (dhcp6_add_listval(ial, DHCP6_LISTVAL_IANA,
&iaparam, &pl) == NULL) {
goto fail;
}
dhcp6_clear_list(&pl);
evd->type = DHCP6_EVDATA_IANA;
evd->data = ial;
evd->event = ev;
evd->destructor = destruct_iadata;
TAILQ_INSERT_TAIL(&ev->data_list, evd, link);
break;
default:
d_printf(LOG_ERR, FNAME, "internal error");
exit(1);
}
}
return (0);
fail:
if (evd)
free(evd);
if (ial)
free(ial);
dhcp6_remove_event(ev); /* XXX */
return (-1);
}
static int
construct_reqdata(struct dhcp6_if *ifp,
struct dhcp6_optinfo *optinfo, struct dhcp6_event *ev)
{
struct ia_conf *iac;
struct dhcp6_eventdata *evd = NULL;
struct dhcp6_list *ial = NULL;
struct dhcp6_ia iaparam;
/* discard previous event data */
dhcp6_remove_evdata(ev);
if (optinfo == NULL)
return (0);
for (iac = TAILQ_FIRST(&ifp->iaconf_list); iac;
iac = TAILQ_NEXT(iac, link)) {
struct dhcp6_listval *v;
/* ignore IA config currently used */
if (!TAILQ_EMPTY(&iac->iadata))
continue;
memset(&iaparam, 0, sizeof(iaparam));
iaparam.iaid = iac->iaid;
ial = NULL;
evd = NULL;
switch (iac->type) {
case IATYPE_PD:
if ((v = dhcp6_find_listval(&optinfo->iapd_list,
DHCP6_LISTVAL_IAPD, &iaparam, 0)) == NULL)
continue;
if ((ial = malloc(sizeof(*ial))) == NULL)
goto fail;
TAILQ_INIT(ial);
if (dhcp6_add_listval(ial, DHCP6_LISTVAL_IAPD,
&iaparam, &v->sublist) == NULL) {
goto fail;
}
if ((evd = malloc(sizeof(*evd))) == NULL)
goto fail;
memset(evd, 0, sizeof(*evd));
evd->type = DHCP6_EVDATA_IAPD;
evd->data = ial;
evd->event = ev;
evd->destructor = destruct_iadata;
TAILQ_INSERT_TAIL(&ev->data_list, evd, link);
break;
case IATYPE_NA:
if ((v = dhcp6_find_listval(&optinfo->iana_list,
DHCP6_LISTVAL_IANA, &iaparam, 0)) == NULL)
continue;
if ((ial = malloc(sizeof(*ial))) == NULL)
goto fail;
TAILQ_INIT(ial);
if (dhcp6_add_listval(ial, DHCP6_LISTVAL_IANA,
&iaparam, &v->sublist) == NULL) {
goto fail;
}
if ((evd = malloc(sizeof(*evd))) == NULL)
goto fail;
memset(evd, 0, sizeof(*evd));
evd->type = DHCP6_EVDATA_IANA;
evd->data = ial;
evd->event = ev;
evd->destructor = destruct_iadata;
TAILQ_INSERT_TAIL(&ev->data_list, evd, link);
break;
default:
d_printf(LOG_ERR, FNAME, "internal error");
exit(1);
}
}
return (0);
fail:
if (evd)
free(evd);
if (ial)
free(ial);
dhcp6_remove_event(ev); /* XXX */
return (-1);
}
static void
destruct_iadata(struct dhcp6_eventdata *evd)
{
struct dhcp6_list *ial;
if (evd->type != DHCP6_EVDATA_IAPD && evd->type != DHCP6_EVDATA_IANA) {
d_printf(LOG_ERR, FNAME, "assumption failure %d", evd->type);
exit(1);
}
ial = (struct dhcp6_list *)evd->data;
dhcp6_clear_list(ial);
free(ial);
}
static struct dhcp6_serverinfo *
select_server(struct dhcp6_event *ev)
{
struct dhcp6_serverinfo *s;
/*
* pick the best server according to RFC3315 Section 17.1.3.
* XXX: we currently just choose the one that is active and has the
* highest preference.
*/
for (s = ev->servers; s; s = s->next) {
if (s->active) {
d_printf(LOG_DEBUG, FNAME, "picked a server (ID: %s)",
duidstr(&s->optinfo.serverID));
return (s);
}
}
return (NULL);
}
static void
client6_signal(int sig)
{
switch (sig) {
case SIGTERM:
sig_flags |= SIGF_TERM;
break;
case SIGHUP:
sig_flags |= SIGF_HUP;
break;
case SIGUSR1:
sig_flags |= SIGF_USR1;
break;
}
}
void
client6_send(struct dhcp6_event *ev)
{
struct dhcp6_if *ifp;
char buf[BUFSIZ];
struct sockaddr_in6 dst;
struct dhcp6 *dh6;
struct dhcp6_optinfo optinfo;
ssize_t optlen, len;
struct dhcp6_eventdata *evd;
ifp = ev->ifp;
dh6 = (struct dhcp6 *)buf;
memset(dh6, 0, sizeof(*dh6));
switch(ev->state) {
case DHCP6S_SOLICIT:
dh6->dh6_msgtype = DH6_SOLICIT;
d_printf(LOG_INFO, FNAME, "Sending Solicit");
break;
case DHCP6S_REQUEST:
dh6->dh6_msgtype = DH6_REQUEST;
d_printf(LOG_INFO, FNAME, "Sending Request");
break;
case DHCP6S_RENEW:
dh6->dh6_msgtype = DH6_RENEW;
d_printf(LOG_INFO, FNAME, "Sending Renew");
break;
case DHCP6S_REBIND:
dh6->dh6_msgtype = DH6_REBIND;
d_printf(LOG_INFO, FNAME, "Sending Rebind");
break;
case DHCP6S_RELEASE:
dh6->dh6_msgtype = DH6_RELEASE;
d_printf(LOG_INFO, FNAME, "Sending Release");
break;
case DHCP6S_INFOREQ:
dh6->dh6_msgtype = DH6_INFORM_REQ;
d_printf(LOG_INFO, FNAME, "Sending Information Request");
break;
default:
d_printf(LOG_ERR, FNAME, "unexpected state");
exit(1); /* XXX */
}
if (ev->timeouts == 0) {
/*
* A client SHOULD generate a random number that cannot easily
* be guessed or predicted to use as the transaction ID for
* each new message it sends.
*
* A client MUST leave the transaction-ID unchanged in
* retransmissions of a message. [RFC3315 15.1]
*/
#ifdef HAVE_ARC4RANDOM
ev->xid = arc4random() & DH6_XIDMASK;
#else
ev->xid = random() & DH6_XIDMASK;
#endif
d_printf(LOG_DEBUG, FNAME, "a new XID (%x) is generated",
ev->xid);
}
dh6->dh6_xid &= ~ntohl(DH6_XIDMASK);
dh6->dh6_xid |= htonl(ev->xid);
len = sizeof(*dh6);
/*
* construct options
*/
dhcp6_init_options(&optinfo);
/* server ID */
switch (ev->state) {
case DHCP6S_REQUEST:
case DHCP6S_RENEW:
case DHCP6S_RELEASE:
if (duidcpy(&optinfo.serverID, &ev->serverid)) {
d_printf(LOG_ERR, FNAME, "failed to copy server ID");
goto end;
}
break;
}
/* client ID */
if (duidcpy(&optinfo.clientID, &client_duid)) {