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common.c
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/* $KAME: common.c,v 1.129 2005/09/16 11:30:13 suz 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/socket.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/stat.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>
#include <netinet/in.h>
#ifdef __KAME__
#include <net/if_types.h>
#ifdef __FreeBSD__
#include <net/if_var.h>
#endif
#include <net/if_dl.h>
#endif
#ifdef __linux__
#include <linux/if_packet.h>
#endif
#include <net/if_arp.h>
#ifdef __sun__
#include <sys/sockio.h>
#include <sys/dlpi.h>
#include <stropts.h>
#include <fcntl.h>
#include <libdevinfo.h>
#endif
#ifdef __KAME__
#include <netinet6/in6_var.h>
#endif
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdarg.h>
#include <syslog.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <err.h>
#include <netdb.h>
#include <ifaddrs.h>
#include "dhcp6.h"
#include "config.h"
#include "common.h"
#include "timer.h"
#ifdef __linux__
/* from /usr/include/linux/ipv6.h */
struct in6_ifreq {
struct in6_addr ifr6_addr;
uint32_t ifr6_prefixlen;
unsigned int ifr6_ifindex;
};
#endif
#define MAXDNAME 255
int foreground;
int debug_thresh;
static int dhcp6_count_list(struct dhcp6_list *);
static int in6_matchflags(struct sockaddr *, char *, int);
static ssize_t dnsencode(const char *, char *, size_t);
static char *dnsdecode(u_char **, u_char *, char *, size_t);
static int copyout_option(char *, char *, struct dhcp6_listval *);
static int copyin_option(int, struct dhcp6opt *, struct dhcp6opt *,
struct dhcp6_list *);
static int copy_option(uint16_t, uint16_t, void *, struct dhcp6opt **,
struct dhcp6opt *, int *);
static ssize_t gethwid(char *, int, const char *, uint16_t *);
static char *sprint_uint64(char *, int, uint64_t);
static char *sprint_auth(struct dhcp6_optinfo *);
int
rawop_count_list(head)
struct rawop_list *head;
{
struct rawoption *op;
int i;
//d_printf(LOG_INFO, FNAME, "counting list at %p", (void*)head);
for (i = 0, op = TAILQ_FIRST(head); op; op = TAILQ_NEXT(op, link)) {
i++;
}
return (i);
}
void
rawop_clear_list(head)
struct rawop_list *head;
{
struct rawoption *op;
//d_printf(LOG_INFO, FNAME, "clearing %d rawops at %p", rawop_count_list(head), (void*)head);
while ((op = TAILQ_FIRST(head)) != NULL) {
//d_printf(LOG_INFO, FNAME, " current op: %p link: %p", (void*)op, op->link);
TAILQ_REMOVE(head, op, link);
if (op->data != NULL) {
d_printf(LOG_INFO, FNAME, " freeing op data at %p", (void*)op->data);
free(op->data);
}
free(op); // Needed? yes
}
return;
}
int
rawop_copy_list(dst, src)
struct rawop_list *dst, *src;
{
struct rawoption *op, *newop;
/*
d_printf(LOG_INFO, FNAME,
" copying rawop list %p to %p (%d ops)",
(void*)src, (void*)dst, rawop_count_list(src));
*/
for (op = TAILQ_FIRST(src); op; op = TAILQ_NEXT(op, link)) {
newop = NULL;
if ((newop = malloc(sizeof(*newop))) == NULL) {
d_printf(LOG_ERR, FNAME,
"failed to allocate memory for a new raw option");
goto fail;
}
memset(newop, 0, sizeof(*newop));
newop->opnum = op->opnum;
newop->datalen = op->datalen;
newop->data = NULL;
/* copy data */
if ((newop->data = malloc(newop->datalen)) == NULL) {
d_printf(LOG_ERR, FNAME,
"failed to allocate memory for new raw option data");
goto fail;
}
memcpy(newop->data, op->data, newop->datalen);
//d_printf(LOG_INFO, FNAME, " copied %d bytes of data at %p", newop->datalen, (void*)newop->data);
TAILQ_INSERT_TAIL(dst, newop, link);
}
return (0);
fail:
rawop_clear_list(dst);
return (-1);
}
void
rawop_move_list(dst, src)
struct rawop_list *dst, *src;
{
struct rawoption *op;
/*
d_printf(LOG_INFO, FNAME,
" moving rawop list of %d from %p to %p",
rawop_count_list(src), (void*)src, (void*)dst);
*/
while ((op = TAILQ_FIRST(src)) != NULL) {
TAILQ_REMOVE(src, op, link);
TAILQ_INSERT_TAIL(dst, op, link);
}
}
int
dhcp6_copy_list(struct dhcp6_list *dst, struct dhcp6_list *src)
{
struct dhcp6_listval *ent;
for (ent = TAILQ_FIRST(src); ent; ent = TAILQ_NEXT(ent, link)) {
if (dhcp6_add_listval(dst, ent->type,
&ent->uv, &ent->sublist) == NULL)
goto fail;
}
return (0);
fail:
dhcp6_clear_list(dst);
return (-1);
}
void
dhcp6_move_list(struct dhcp6_list *dst, struct dhcp6_list *src)
{
struct dhcp6_listval *v;
while ((v = TAILQ_FIRST(src)) != NULL) {
TAILQ_REMOVE(src, v, link);
TAILQ_INSERT_TAIL(dst, v, link);
}
}
void
dhcp6_clear_list(struct dhcp6_list *head)
{
struct dhcp6_listval *v;
while ((v = TAILQ_FIRST(head)) != NULL) {
TAILQ_REMOVE(head, v, link);
dhcp6_clear_listval(v);
}
return;
}
static int
dhcp6_count_list(struct dhcp6_list *head)
{
struct dhcp6_listval *v;
int i;
for (i = 0, v = TAILQ_FIRST(head); v; v = TAILQ_NEXT(v, link))
i++;
return (i);
}
void
dhcp6_clear_listval(struct dhcp6_listval *lv)
{
dhcp6_clear_list(&lv->sublist);
switch (lv->type) {
case DHCP6_LISTVAL_VBUF:
dhcp6_vbuf_free(&lv->val_vbuf);
break;
default: /* nothing to do */
break;
}
free(lv);
}
/*
* Note: this function only searches for the first entry that matches
* VAL. It also does not care about sublists.
*/
struct dhcp6_listval *
dhcp6_find_listval(struct dhcp6_list *head, dhcp6_listval_type_t type,
void *val, int option)
{
struct dhcp6_listval *lv;
for (lv = TAILQ_FIRST(head); lv; lv = TAILQ_NEXT(lv, link)) {
if (lv->type != type)
continue;
switch(type) {
case DHCP6_LISTVAL_NUM:
if (lv->val_num == *(int *)val)
return (lv);
break;
case DHCP6_LISTVAL_STCODE:
if (lv->val_num16 == *(uint16_t *)val)
return (lv);
break;
case DHCP6_LISTVAL_ADDR6:
if (IN6_ARE_ADDR_EQUAL(&lv->val_addr6,
(struct in6_addr *)val)) {
return (lv);
}
break;
case DHCP6_LISTVAL_PREFIX6:
if ((option & MATCHLIST_PREFIXLEN) &&
lv->val_prefix6.plen ==
((struct dhcp6_prefix *)val)->plen) {
return (lv);
} else if (IN6_ARE_ADDR_EQUAL(&lv->val_prefix6.addr,
&((struct dhcp6_prefix *)val)->addr) &&
lv->val_prefix6.plen ==
((struct dhcp6_prefix *)val)->plen) {
return (lv);
}
break;
case DHCP6_LISTVAL_STATEFULADDR6:
if (IN6_ARE_ADDR_EQUAL(&lv->val_statefuladdr6.addr,
&((struct dhcp6_prefix *)val)->addr)) {
return (lv);
}
break;
case DHCP6_LISTVAL_IAPD:
case DHCP6_LISTVAL_IANA:
if (lv->val_ia.iaid ==
((struct dhcp6_ia *)val)->iaid) {
return (lv);
}
break;
case DHCP6_LISTVAL_VBUF:
if (dhcp6_vbuf_cmp(&lv->val_vbuf,
(struct dhcp6_vbuf *)val) == 0) {
return (lv);
}
break;
}
}
return (NULL);
}
struct dhcp6_listval *
dhcp6_add_listval(struct dhcp6_list *head, dhcp6_listval_type_t type,
void *val, struct dhcp6_list *sublist)
{
struct dhcp6_listval *lv = NULL;
if ((lv = malloc(sizeof(*lv))) == NULL) {
d_printf(LOG_ERR, FNAME,
"failed to allocate memory for list entry");
goto fail;
}
memset(lv, 0, sizeof(*lv));
lv->type = type;
TAILQ_INIT(&lv->sublist);
switch(type) {
case DHCP6_LISTVAL_NUM:
lv->val_num = *(int *)val;
break;
case DHCP6_LISTVAL_STCODE:
lv->val_num16 = *(uint16_t *)val;
break;
case DHCP6_LISTVAL_ADDR6:
lv->val_addr6 = *(struct in6_addr *)val;
break;
case DHCP6_LISTVAL_PREFIX6:
lv->val_prefix6 = *(struct dhcp6_prefix *)val;
break;
case DHCP6_LISTVAL_STATEFULADDR6:
lv->val_statefuladdr6 = *(struct dhcp6_statefuladdr *)val;
break;
case DHCP6_LISTVAL_IAPD:
case DHCP6_LISTVAL_IANA:
lv->val_ia = *(struct dhcp6_ia *)val;
break;
case DHCP6_LISTVAL_VBUF:
if (dhcp6_vbuf_copy(&lv->val_vbuf, (struct dhcp6_vbuf *)val))
goto fail;
break;
default:
d_printf(LOG_ERR, FNAME,
"unexpected list value type (%d)", type);
goto fail;
}
if (sublist && dhcp6_copy_list(&lv->sublist, sublist))
goto fail;
TAILQ_INSERT_TAIL(head, lv, link);
return (lv);
fail:
if (lv)
free(lv);
return (NULL);
}
int
dhcp6_vbuf_copy(struct dhcp6_vbuf *dst, struct dhcp6_vbuf *src)
{
dst->dv_buf = malloc(src->dv_len);
if (dst->dv_buf == NULL)
return (-1);
dst->dv_len = src->dv_len;
memcpy(dst->dv_buf, src->dv_buf, dst->dv_len);
return (0);
}
void
dhcp6_vbuf_free(struct dhcp6_vbuf *vbuf)
{
free(vbuf->dv_buf);
vbuf->dv_len = 0;
vbuf->dv_buf = NULL;
}
int
dhcp6_vbuf_cmp(struct dhcp6_vbuf *vb1, struct dhcp6_vbuf *vb2)
{
if (vb1->dv_len != vb2->dv_len)
return (vb1->dv_len - vb2->dv_len);
return (memcmp(vb1->dv_buf, vb2->dv_buf, vb1->dv_len));
}
static int
dhcp6_get_addr(int optlen, void *cp, dhcp6_listval_type_t type,
struct dhcp6_list *list)
{
char *val;
if (optlen % sizeof(struct in6_addr) || optlen == 0) {
d_printf(LOG_INFO, FNAME,
"malformed DHCP option: type %d, len %d", type, optlen);
return -1;
}
for (val = (char *)cp; val < (char *)cp + optlen;
val += sizeof(struct in6_addr)) {
struct in6_addr valaddr;
memcpy(&valaddr, val, sizeof(valaddr));
if (dhcp6_find_listval(list,
DHCP6_LISTVAL_ADDR6, &valaddr, 0)) {
d_printf(LOG_INFO, FNAME, "duplicated %s address (%s)",
dhcp6optstr(type), in6addr2str(&valaddr, 0));
continue;
}
if (dhcp6_add_listval(list, DHCP6_LISTVAL_ADDR6,
&valaddr, NULL) == NULL) {
d_printf(LOG_ERR, FNAME,
"failed to copy %s address", dhcp6optstr(type));
return -1;
}
}
return 0;
}
static int
dhcp6_set_addr(type, list, p, optep, len)
dhcp6_listval_type_t type;
struct dhcp6_list *list;
struct dhcp6opt **p, *optep;
int *len;
{
struct in6_addr *in6;
struct dhcp6_listval *d;
int optlen;
if (TAILQ_EMPTY(list))
return 0;
optlen = dhcp6_count_list(list) * sizeof(struct in6_addr);
if ((in6 = malloc(optlen)) == NULL) {
d_printf(LOG_ERR, FNAME,
"memory allocation failed for %s options",
dhcp6optstr(type));
return -1;
}
for (d = TAILQ_FIRST(list); d; d = TAILQ_NEXT(d, link), in6++)
memcpy(in6, &d->val_addr6, sizeof(*in6));
if (copy_option(type, optlen, (char *)in6, p, optep, len) != 0) {
free(in6);
return -1;
}
free(in6);
return 0;
}
static int
dhcp6_get_domain(optlen, cp, type, list)
int optlen;
void *cp;
dhcp6_listval_type_t type;
struct dhcp6_list *list;
{
char *val;
val = (char *)cp;
while (val < (char *)cp + optlen) {
struct dhcp6_vbuf vb;
char name[MAXDNAME + 1];
if (dnsdecode((u_char **)(void *)&val,
(u_char *)((char *)cp + optlen), name, sizeof(name)) == NULL) {
d_printf(LOG_INFO, FNAME, "failed to "
"decode a %s domain name",
dhcp6optstr(type));
d_printf(LOG_INFO, FNAME,
"malformed DHCP option: type %d, len %d",
type, optlen);
return -1;
}
vb.dv_len = strlen(name) + 1;
vb.dv_buf = name;
if (dhcp6_add_listval(list,
DHCP6_LISTVAL_VBUF, &vb, NULL) == NULL) {
d_printf(LOG_ERR, FNAME, "failed to "
"copy a %s domain name", dhcp6optstr(type));
return -1;
}
}
return 0;
}
static int
dhcp6_set_domain(type, list, p, optep, len)
dhcp6_listval_type_t type;
struct dhcp6_list *list;
struct dhcp6opt **p, *optep;
int *len;
{
int optlen = 0;
struct dhcp6_listval *d;
char *tmpbuf;
char name[MAXDNAME], *cp, *ep;
if (TAILQ_EMPTY(list))
return 0;
for (d = TAILQ_FIRST(list); d; d = TAILQ_NEXT(d, link))
optlen += (d->val_vbuf.dv_len + 1);
if (optlen == 0) {
return 0;
}
tmpbuf = NULL;
if ((tmpbuf = malloc(optlen)) == NULL) {
d_printf(LOG_ERR, FNAME, "memory allocation failed for "
"%s domain options", dhcp6optstr(type));
return -1;
}
cp = tmpbuf;
ep = cp + optlen;
for (d = TAILQ_FIRST(list); d; d = TAILQ_NEXT(d, link)) {
int nlen;
nlen = dnsencode((const char *)d->val_vbuf.dv_buf,
name, sizeof (name));
if (nlen < 0) {
d_printf(LOG_ERR, FNAME,
"failed to encode a %s domain name",
dhcp6optstr(type));
free(tmpbuf);
return -1;
}
if (ep - cp < nlen) {
d_printf(LOG_ERR, FNAME,
"buffer length for %s domain name is too short",
dhcp6optstr(type));
free(tmpbuf);
return -1;
}
memcpy(cp, name, nlen);
cp += nlen;
}
if (copy_option(type, cp - tmpbuf, tmpbuf, p, optep, len) != 0) {
free(tmpbuf);
return -1;
}
free(tmpbuf);
return 0;
}
struct dhcp6_event *
dhcp6_create_event(ifp, state)
struct dhcp6_if *ifp;
int state;
{
struct dhcp6_event *ev;
if ((ev = malloc(sizeof(*ev))) == NULL) {
d_printf(LOG_ERR, FNAME,
"failed to allocate memory for an event");
return (NULL);
}
memset(ev, 0, sizeof(*ev));
ev->ifp = ifp;
ev->state = state;
TAILQ_INIT(&ev->data_list);
return (ev);
}
void
dhcp6_remove_event(ev)
struct dhcp6_event *ev;
{
struct dhcp6_serverinfo *sp, *sp_next;
d_printf(LOG_DEBUG, FNAME, "removing an event on %s, state=%s",
ev->ifp->ifname, dhcp6_event_statestr(ev));
dhcp6_remove_evdata(ev);
duidfree(&ev->serverid);
if (ev->timer)
dhcp6_remove_timer(&ev->timer);
TAILQ_REMOVE(&ev->ifp->event_list, ev, link);
for (sp = ev->servers; sp; sp = sp_next) {
sp_next = sp->next;
d_printf(LOG_DEBUG, FNAME, "removing server (ID: %s)",
duidstr(&sp->optinfo.serverID));
dhcp6_clear_options(&sp->optinfo);
if (sp->authparam != NULL)
free(sp->authparam);
free(sp);
}
if (ev->authparam != NULL)
free(ev->authparam);
free(ev);
}
void
dhcp6_remove_evdata(ev)
struct dhcp6_event *ev;
{
struct dhcp6_eventdata *evd;
while ((evd = TAILQ_FIRST(&ev->data_list)) != NULL) {
TAILQ_REMOVE(&ev->data_list, evd, link);
if (evd->destructor)
(*evd->destructor)(evd);
free(evd);
}
}
struct authparam *
new_authparam(proto, alg, rdm)
int proto, alg, rdm;
{
struct authparam *authparam;
if ((authparam = malloc(sizeof(*authparam))) == NULL)
return (NULL);
memset(authparam, 0, sizeof(*authparam));
authparam->authproto = proto;
authparam->authalgorithm = alg;
authparam->authrdm = rdm;
authparam->key = NULL;
authparam->flags |= AUTHPARAM_FLAGS_NOPREVRD;
authparam->prevrd = 0;
return (authparam);
}
struct authparam *
copy_authparam(authparam)
struct authparam *authparam;
{
struct authparam *dst;
if ((dst = malloc(sizeof(*dst))) == NULL)
return (NULL);
memcpy(dst, authparam, sizeof(*dst));
return (dst);
}
/*
* Home-brew function of a 64-bit version of ntohl.
* XXX: is there any standard for this?
*/
#if (BYTE_ORDER == LITTLE_ENDIAN)
static __inline uint64_t
ntohq(uint64_t x)
{
return (uint64_t)ntohl((uint32_t)(x >> 32)) |
(int64_t)ntohl((uint32_t)(x & 0xffffffff)) << 32;
}
#else /* (BYTE_ORDER == LITTLE_ENDIAN) */
#define ntohq(x) (x)
#endif
int
dhcp6_auth_replaycheck(method, prev, current)
int method;
uint64_t prev, current;
{
char bufprev[] = "ffff ffff ffff ffff";
char bufcurrent[] = "ffff ffff ffff ffff";
if (method != DHCP6_AUTHRDM_MONOCOUNTER) {
d_printf(LOG_ERR, FNAME, "unsupported replay detection "
"method (%d)", method);
return (-1);
}
(void)sprint_uint64(bufprev, sizeof(bufprev), prev);
(void)sprint_uint64(bufcurrent, sizeof(bufcurrent), current);
d_printf(LOG_DEBUG, FNAME, "previous: %s, current: %s",
bufprev, bufcurrent);
prev = ntohq(prev);
current = ntohq(current);
/*
* we call the singular point guilty, since we cannot guess
* whether the serial number is increasing or not.
*/
if (prev == (current ^ 0x8000000000000000ULL)) {
d_printf(LOG_INFO, FNAME, "detected a singular point");
return (1);
}
return (((int64_t)(current - prev) > 0) ? 0 : 1);
}
int
getifaddr(addr, ifnam, prefix, plen, strong, ignoreflags)
struct in6_addr *addr;
char *ifnam;
struct in6_addr *prefix;
int plen;
int strong; /* if strong host model is required or not */
int ignoreflags;
{
struct ifaddrs *ifap, *ifa;
struct sockaddr_in6 sin6;
int error = -1;
if (getifaddrs(&ifap) != 0) {
d_printf(LOG_WARNING, FNAME,
"getifaddrs failed: %s", strerror(errno));
return (-1);
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
int s1, s2;
if (strong && strcmp(ifnam, ifa->ifa_name) != 0)
continue;
/* in any case, ignore interfaces in different scope zones. */
if ((s1 = in6_addrscopebyif(prefix, ifnam)) < 0 ||
(s2 = in6_addrscopebyif(prefix, ifa->ifa_name)) < 0 ||
s1 != s2)
continue;
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
#ifdef HAVE_SA_LEN
if (ifa->ifa_addr->sa_len > sizeof(sin6))
continue;
#endif
if (in6_matchflags(ifa->ifa_addr, ifa->ifa_name, ignoreflags))
continue;
memcpy(&sin6, ifa->ifa_addr, sysdep_sa_len(ifa->ifa_addr));
#ifdef __KAME__
if (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr)) {
sin6.sin6_addr.s6_addr[2] = 0;
sin6.sin6_addr.s6_addr[3] = 0;
}
#endif
if (plen % 8 == 0) {
if (memcmp(&sin6.sin6_addr, prefix, plen / 8) != 0)
continue;
} else {
struct in6_addr a, m;
int i;
memcpy(&a, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
memset(&m, 0, sizeof(m));
memset(&m, 0xff, plen / 8);
m.s6_addr[plen / 8] = (0xff00 >> (plen % 8)) & 0xff;
for (i = 0; i < (int)sizeof(a); i++)
a.s6_addr[i] &= m.s6_addr[i];
if (memcmp(&a, prefix, plen / 8) != 0 ||
a.s6_addr[plen / 8] !=
(prefix->s6_addr[plen / 8] & m.s6_addr[plen / 8]))
continue;
}
memcpy(addr, &sin6.sin6_addr, sizeof(sin6.sin6_addr));
#ifdef __KAME__
if (IN6_IS_ADDR_LINKLOCAL(addr))
addr->s6_addr[2] = addr->s6_addr[3] = 0;
#endif
error = 0;
break;
}
freeifaddrs(ifap);
return (error);
}
int
getifidfromaddr(addr, ifidp)
struct in6_addr *addr;
unsigned int *ifidp;
{
struct ifaddrs *ifap, *ifa;
struct sockaddr_in6 *sa6;
unsigned int ifid;
int retval = -1;
if (getifaddrs(&ifap) != 0) {
d_printf(LOG_WARNING, FNAME,
"getifaddrs failed: %s", strerror(errno));
return (-1);
}
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
sa6 = (struct sockaddr_in6 *)(void *)ifa->ifa_addr;
if (IN6_ARE_ADDR_EQUAL(addr, &sa6->sin6_addr))
break;
}
if (ifa != NULL) {
if ((ifid = if_nametoindex(ifa->ifa_name)) == 0) {
d_printf(LOG_ERR, FNAME,
"if_nametoindex failed for %s", ifa->ifa_name);
goto end;
}
retval = 0;
*ifidp = ifid;
}
end:
freeifaddrs(ifap);
return (retval);
}
int
in6_addrscopebyif(addr, ifnam)
struct in6_addr *addr;
char *ifnam;
{
u_int ifindex;
if ((ifindex = if_nametoindex(ifnam)) == 0)
return (-1);
if (IN6_IS_ADDR_LINKLOCAL(addr) || IN6_IS_ADDR_MC_LINKLOCAL(addr))
return (ifindex);
if (IN6_IS_ADDR_SITELOCAL(addr) || IN6_IS_ADDR_MC_SITELOCAL(addr))
return (1); /* XXX */
if (IN6_IS_ADDR_MC_ORGLOCAL(addr))
return (1); /* XXX */
return (1); /* treat it as global */
}
int
transmit_sa(s, sa, buf, len)
int s;
struct sockaddr *sa;
char *buf;
size_t len;
{
ssize_t error;
error = sendto(s, buf, len, 0, sa, sysdep_sa_len(sa));
return (error != (ssize_t)len) ? -1 : 0;
}
long
random_between(x, y)
long x;
long y;
{
long ratio;
ratio = 1 << 16;
while ((y - x) * ratio < (y - x))
ratio = ratio / 2;
return (x + ((y - x) * (ratio - 1) / random() & (ratio - 1)));
}
int
prefix6_mask(in6, plen)
struct in6_addr *in6;
int plen;
{
struct sockaddr_in6 mask6;
int i;
if (sa6_plen2mask(&mask6, plen))
return (-1);
for (i = 0; i < 16; i++)
in6->s6_addr[i] &= mask6.sin6_addr.s6_addr[i];
return (0);
}
int
sa6_plen2mask(sa6, plen)
struct sockaddr_in6 *sa6;
int plen;
{
u_char *cp;
if (plen < 0 || plen > 128)
return (-1);
memset(sa6, 0, sizeof(*sa6));
sa6->sin6_family = AF_INET6;
#ifdef HAVE_SA_LEN
sa6->sin6_len = sizeof(*sa6);
#endif
for (cp = (u_char *)&sa6->sin6_addr; plen > 7; plen -= 8)
*cp++ = 0xff;
*cp = 0xff << (8 - plen);
return (0);
}
char *
addr2str(sa)
struct sockaddr *sa;
{
static char addrbuf[8][NI_MAXHOST];
static int round = 0;
char *cp;
round = (round + 1) & 7;
cp = addrbuf[round];
getnameinfo(sa, sysdep_sa_len(sa), cp, NI_MAXHOST,
NULL, 0, NI_NUMERICHOST);
return (cp);
}
char *
in6addr2str(in6, scopeid)
struct in6_addr *in6;
int scopeid;
{
struct sockaddr_in6 sa6;
memset(&sa6, 0, sizeof(sa6));
sa6.sin6_family = AF_INET6;
#ifdef HAVE_SA_LEN
sa6.sin6_len = sizeof(sa6);
#endif
sa6.sin6_addr = *in6;
sa6.sin6_scope_id = scopeid;
return (addr2str((struct sockaddr *)&sa6));
}
/* return IPv6 address scope type. caller assumes that smaller is narrower. */