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dhcp6c.c
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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 <dhcp6.h>
#include <config.h>
#include <common.h>
#include <timer.h>
#include <dhcp6c.h>
#include <control.h>
#include <dhcp6_ctl.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
const dhcp6_mode_t dhcp6_mode = DHCP6_MODE_CLIENT;
int sock; /* inbound/outbound udp port */
int rtsock; /* routing socket */
int ctlsock = -1; /* control TCP port */
char *ctladdr = DEFAULT_CLIENT_CONTROL_ADDR;
char *ctlport = DEFAULT_CLIENT_CONTROL_PORT;
#define DEFAULT_KEYFILE SYSCONFDIR "/dhcp6cctlkey"
#define CTLSKEW 300
static char *conffile = DHCP6C_CONF;
static const struct sockaddr_in6 *sa6_allagent;
static struct duid client_duid;
static char *pid_file = DHCP6C_PIDFILE;
static char *ctlkeyfile = DEFAULT_KEYFILE;
static struct keyinfo *ctlkey = NULL;
static int ctldigestlen;
static int infreq_mode = 0;
static inline int get_val32 __P((char **, int *, u_int32_t *));
static inline int get_ifname __P((char **, int *, char *, int));
static void usage __P((void));
static void client6_init __P((void));
static void client6_startall __P((int));
static void free_resources __P((struct dhcp6_if *));
static void client6_mainloop __P((void));
static int client6_do_ctlcommand __P((char *, ssize_t));
static void client6_reload __P((void));
static int client6_ifctl __P((char *ifname, u_int16_t));
static void check_exit __P((void));
static void process_signals __P((void));
static struct dhcp6_serverinfo *find_server __P((struct dhcp6_event *,
struct duid *));
static struct dhcp6_serverinfo *select_server __P((struct dhcp6_event *));
static void client6_recv __P((void));
static int client6_recvadvert __P((struct dhcp6_if *, struct dhcp6 *,
ssize_t, struct dhcp6_optinfo *));
static int client6_recvreply __P((struct dhcp6_if *, struct dhcp6 *,
ssize_t, struct dhcp6_optinfo *));
static void client6_signal __P((int));
static struct dhcp6_event *find_event_withid __P((struct dhcp6_if *,
u_int32_t));
static int construct_confdata __P((struct dhcp6_if *, struct dhcp6_event *));
static int construct_reqdata __P((struct dhcp6_if *, struct dhcp6_optinfo *,
struct dhcp6_event *));
static void destruct_iadata __P((struct dhcp6_eventdata *));
static void tv_sub __P((struct timeval *, struct timeval *, struct timeval *));
static struct dhcp6_timer *client6_expire_refreshtime __P((void *));
static int process_auth __P((struct authparam *, struct dhcp6 *dh6, ssize_t,
struct dhcp6_optinfo *));
static int set_auth __P((struct dhcp6_event *, struct dhcp6_optinfo *));
struct dhcp6_timer *client6_timo __P((void *));
int client6_start __P((struct dhcp6_if *));
static void info_printf __P((const char *, ...));
extern int client6_script __P((char *, int, struct dhcp6_optinfo *));
#define MAX_ELAPSED_TIME 0xffff
int
main(argc, argv)
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:dDfik:p:")) != -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 'k':
ctlkeyfile = optarg;
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) {
dprintf(LOG_ERR, FNAME, "failed to initialize %s",
argv[0]);
exit(1);
}
argv++;
}
if (infreq_mode == 0 && (cfparse(conffile)) != 0) {
dprintf(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] [-dDfi] "
"[-p pid-file] interface [interfaces...]\n");
}
/*------------------------------------------------------------*/
void
client6_init()
{
struct addrinfo hints, *res;
static struct sockaddr_in6 sa6_allagent_storage;
int error, on = 1;
/* get our DUID */
if (get_duid(DUID_FILE, &client_duid)) {
dprintf(LOG_ERR, FNAME, "failed to get a DUID");
exit(1);
}
if (dhcp6_ctl_authinit(ctlkeyfile, &ctlkey, &ctldigestlen) != 0) {
dprintf(LOG_NOTICE, FNAME,
"failed initialize control message authentication");
/* run the server anyway */
}
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) {
dprintf(LOG_ERR, FNAME, "getaddrinfo: %s",
gai_strerror(error));
exit(1);
}
sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (sock < 0) {
dprintf(LOG_ERR, FNAME, "socket");
exit(1);
}
if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT,
&on, sizeof(on)) < 0) {
dprintf(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) {
dprintf(LOG_ERR, FNAME,
"setsockopt(IPV6_RECVPKTINFO): %s",
strerror(errno));
exit(1);
}
#else
if (setsockopt(sock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
sizeof(on)) < 0) {
dprintf(LOG_ERR, FNAME,
"setsockopt(IPV6_PKTINFO): %s",
strerror(errno));
exit(1);
}
#endif
if (setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &on,
sizeof(on)) < 0) {
dprintf(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) {
dprintf(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) {
dprintf(LOG_ERR, FNAME, "bind: %s", strerror(errno));
exit(1);
}
freeaddrinfo(res);
/* open a routing socket to watch the routing table */
if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
dprintf(LOG_ERR, FNAME, "open a routing socket: %s",
strerror(errno));
exit(1);
}
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) {
dprintf(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);
/* set up control socket */
if (ctlkey == NULL)
dprintf(LOG_NOTICE, FNAME, "skip opening control port");
else if (dhcp6_ctl_init(ctladdr, ctlport,
DHCP6CTL_DEF_COMMANDQUEUELEN, &ctlsock)) {
dprintf(LOG_ERR, FNAME,
"failed to initialize control channel");
exit(1);
}
if (signal(SIGHUP, client6_signal) == SIG_ERR) {
dprintf(LOG_WARNING, FNAME, "failed to set signal: %s",
strerror(errno));
exit(1);
}
if (signal(SIGTERM, client6_signal) == SIG_ERR) {
dprintf(LOG_WARNING, FNAME, "failed to set signal: %s",
strerror(errno));
exit(1);
}
}
int
client6_start(ifp)
struct dhcp6_if *ifp;
{
struct dhcp6_event *ev;
/* make sure that the interface does not have a timer */
if (ifp->timer != NULL) {
dprintf(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) {
dprintf(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) {
dprintf(LOG_WARNING, FNAME, "failed to allocate "
"authentication parameters");
dhcp6_remove_event(ev);
return (-1);
}
if ((ev->timer = dhcp6_add_timer(client6_timo, ev)) == NULL) {
dprintf(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(isrestart)
int isrestart;
{
struct dhcp6_if *ifp;
for (ifp = dhcp6_if; ifp; ifp = ifp->next) {
if (isrestart &&ifreset(ifp)) {
dprintf(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(freeifp)
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()
{
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;
}
/* We have no existing event. Do exit. */
dprintf(LOG_INFO, FNAME, "exiting");
exit(0);
}
static void
process_signals()
{
if ((sig_flags & SIGF_TERM)) {
exit_ok = 1;
free_resources(NULL);
unlink(pid_file);
check_exit();
}
if ((sig_flags & SIGF_HUP)) {
dprintf(LOG_INFO, FNAME, "restarting");
free_resources(NULL);
client6_startall(1);
}
sig_flags = 0;
}
static void
client6_mainloop()
{
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;
if (ctlsock >= 0) {
FD_SET(ctlsock, &r);
maxsock = (sock > ctlsock) ? sock : ctlsock;
(void)dhcp6_ctl_setreadfds(&r, &maxsock);
}
ret = select(maxsock + 1, &r, NULL, NULL, w);
switch (ret) {
case -1:
if (errno != EINTR) {
dprintf(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();
if (ctlsock >= 0) {
if (FD_ISSET(ctlsock, &r)) {
(void)dhcp6_ctl_acceptcommand(ctlsock,
client6_do_ctlcommand);
}
(void)dhcp6_ctl_readcommand(&r);
}
}
}
static inline int
get_val32(bpp, lenp, valp)
char **bpp;
int *lenp;
u_int32_t *valp;
{
char *bp = *bpp;
int len = *lenp;
u_int32_t i32;
if (len < sizeof(*valp))
return (-1);
memcpy(&i32, bp, sizeof(i32));
*valp = ntohl(i32);
*bpp = bp + sizeof(*valp);
*lenp = len - sizeof(*valp);
return (0);
}
static inline int
get_ifname(bpp, lenp, ifbuf, ifbuflen)
char **bpp;
int *lenp;
char *ifbuf;
int ifbuflen;
{
char *bp = *bpp;
int len = *lenp, ifnamelen;
u_int32_t i32;
if (get_val32(bpp, lenp, &i32))
return (-1);
ifnamelen = (int)i32;
if (*lenp < ifnamelen || ifnamelen > ifbuflen)
return (-1);
memset(ifbuf, 0, sizeof(ifbuf));
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 int
client6_do_ctlcommand(buf, len)
char *buf;
ssize_t len;
{
struct dhcp6ctl *ctlhead;
u_int16_t command, version;
u_int32_t p32, ts, ts0;
int commandlen;
char *bp;
char ifname[IFNAMSIZ];
time_t now;
memset(ifname, 0, sizeof(ifname));
ctlhead = (struct dhcp6ctl *)buf;
command = ntohs(ctlhead->command);
commandlen = (int)(ntohs(ctlhead->len));
version = ntohs(ctlhead->version);
if (len != sizeof(struct dhcp6ctl) + commandlen) {
dprintf(LOG_ERR, FNAME,
"assumption failure: command length mismatch");
return (DHCP6CTL_R_FAILURE);
}
/* replay protection and message authentication */
if ((now = time(NULL)) < 0) {
dprintf(LOG_ERR, FNAME, "failed to get current time: %s",
strerror(errno));
return (DHCP6CTL_R_FAILURE);
}
ts0 = (u_int32_t)now;
ts = ntohl(ctlhead->timestamp);
if (ts + CTLSKEW < ts0 || (ts - CTLSKEW) > ts0) {
dprintf(LOG_INFO, FNAME, "timestamp is out of range");
return (DHCP6CTL_R_FAILURE);
}
if (ctlkey == NULL) { /* should not happen!! */
dprintf(LOG_ERR, FNAME, "no secret key for control channel");
return (DHCP6CTL_R_FAILURE);
}
if (dhcp6_verify_mac(buf, len, DHCP6CTL_AUTHPROTO_UNDEF,
DHCP6CTL_AUTHALG_HMACMD5, sizeof(*ctlhead), ctlkey) != 0) {
dprintf(LOG_INFO, FNAME, "authentication failure");
return (DHCP6CTL_R_FAILURE);
}
bp = buf + sizeof(*ctlhead) + ctldigestlen;
commandlen -= ctldigestlen;
if (version > DHCP6CTL_VERSION) {
dprintf(LOG_INFO, FNAME, "unsupported version: %d", version);
return (DHCP6CTL_R_FAILURE);
}
switch (command) {
case DHCP6CTL_COMMAND_RELOAD:
if (commandlen != 0) {
dprintf(LOG_INFO, FNAME, "invalid command length "
"for reload: %d", commandlen);
return (DHCP6CTL_R_DONE);
}
client6_reload();
break;
case DHCP6CTL_COMMAND_START:
if (get_val32(&bp, &commandlen, &p32))
return (DHCP6CTL_R_FAILURE);
switch (p32) {
case DHCP6CTL_INTERFACE:
if (get_ifname(&bp, &commandlen, ifname,
sizeof(ifname))) {
return (DHCP6CTL_R_FAILURE);
}
if (client6_ifctl(ifname, DHCP6CTL_COMMAND_START))
return (DHCP6CTL_R_FAILURE);
break;
default:
dprintf(LOG_INFO, FNAME,
"unknown start target: %ul", p32);
return (DHCP6CTL_R_FAILURE);
}
break;
case DHCP6CTL_COMMAND_STOP:
if (commandlen == 0) {
exit_ok = 1;
free_resources(NULL);
unlink(pid_file);
check_exit();
} else {
if (get_val32(&bp, &commandlen, &p32))
return (DHCP6CTL_R_FAILURE);
switch (p32) {
case DHCP6CTL_INTERFACE:
if (get_ifname(&bp, &commandlen, ifname,
sizeof(ifname))) {
return (DHCP6CTL_R_FAILURE);
}
if (client6_ifctl(ifname,
DHCP6CTL_COMMAND_STOP)) {
return (DHCP6CTL_R_FAILURE);
}
break;
default:
dprintf(LOG_INFO, FNAME,
"unknown start target: %ul", p32);
return (DHCP6CTL_R_FAILURE);
}
}
break;
default:
dprintf(LOG_INFO, FNAME,
"unknown control command: %d (len=%d)",
(int)command, commandlen);
return (DHCP6CTL_R_FAILURE);
}
return (DHCP6CTL_R_DONE);
}
static void
client6_reload()
{
/* reload the configuration file */
if (cfparse(conffile) != 0) {
dprintf(LOG_WARNING, FNAME,
"failed to reload configuration file");
return;
}
dprintf(LOG_NOTICE, FNAME, "client reloaded");
return;
}
static int
client6_ifctl(ifname, command)
char *ifname;
u_int16_t command;
{
struct dhcp6_if *ifp;
if ((ifp = find_ifconfbyname(ifname)) == NULL) {
dprintf(LOG_INFO, FNAME,
"failed to find interface configuration for %s",
ifname);
return (-1);
}
dprintf(LOG_DEBUG, FNAME, "%s interface %s",
command == DHCP6CTL_COMMAND_START ? "start" : "stop", ifname);
switch(command) {
case DHCP6CTL_COMMAND_START:
free_resources(ifp);
if (client6_start(ifp)) {
dprintf(LOG_NOTICE, FNAME, "failed to restart %s",
ifname);
return (-1);
}
break;
case DHCP6CTL_COMMAND_STOP:
free_resources(ifp);
if (ifp->timer != NULL) {
dprintf(LOG_DEBUG, FNAME,
"removed existing timer on %s", ifp->ifname);
dhcp6_remove_timer(&ifp->timer);
}
break;
default: /* impossible case, should be a bug */
dprintf(LOG_ERR, FNAME, "unknown command: %d", (int)command);
break;
}
return (0);
}
static struct dhcp6_timer *
client6_expire_refreshtime(arg)
void *arg;
{
struct dhcp6_if *ifp = arg;
dprintf(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(arg)
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) {
dprintf(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)) {
dprintf(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 {
dprintf(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! */
dprintf(LOG_NOTICE, FNAME,
"can't find a server");
exit(1); /* XXX */
}
if (duidcpy(&ev->serverid,
&ev->current_server->optinfo.serverID)) {
dprintf(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)) {
dprintf(LOG_NOTICE, FNAME,
"failed to construct request data");
break;
}
}
client6_send(ev);
break;
}
dhcp6_reset_timer(ev);
return (ev->timer);
}
static int
construct_confdata(ifp, ev)
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) {
dprintf(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:
dprintf(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(ifp, optinfo, ev)
struct dhcp6_if *ifp;
struct dhcp6_optinfo *optinfo;