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|
/* $OpenBSD: kroute.c,v 1.60 2014/01/20 02:54:07 deraadt Exp $ */
/*
* Copyright 2012 Kenneth R Westerback <krw@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "dhcpd.h"
#include "privsep.h"
#include <sys/ioctl.h>
#include <sys/sysctl.h>
#include <sys/uio.h>
#include <net/if_types.h>
#include <ifaddrs.h>
#include <signal.h>
struct in_addr active_addr;
int create_route_label(struct sockaddr_rtlabel *);
int check_route_label(struct sockaddr_rtlabel *);
void populate_rti_info(struct sockaddr **, struct rt_msghdr *);
void delete_route(int, int, struct rt_msghdr *);
#define ROUTE_LABEL_NONE 1
#define ROUTE_LABEL_NOT_DHCLIENT 2
#define ROUTE_LABEL_DHCLIENT_OURS 3
#define ROUTE_LABEL_DHCLIENT_UNKNOWN 4
#define ROUTE_LABEL_DHCLIENT_LIVE 5
#define ROUTE_LABEL_DHCLIENT_DEAD 6
/*
* Do equivalent of
*
* route -q $rdomain -n flush -inet -iface $interface
* arp -dan
*/
void
flush_routes(char *ifname, int rdomain)
{
struct imsg_flush_routes imsg;
int rslt;
memset(&imsg, 0, sizeof(imsg));
strlcpy(imsg.ifname, ifname, sizeof(imsg.ifname));
imsg.rdomain = rdomain;
imsg.zapzombies = 1;
rslt = imsg_compose(unpriv_ibuf, IMSG_FLUSH_ROUTES, 0, 0, -1,
&imsg, sizeof(imsg));
if (rslt == -1)
warning("flush_routes: imsg_compose: %s", strerror(errno));
/* Do flush to maximize chances of cleaning up routes on exit. */
rslt = imsg_flush(unpriv_ibuf);
if (rslt == -1)
warning("flush_routes: imsg_flush: %s", strerror(errno));
}
void
priv_flush_routes(struct imsg_flush_routes *imsg)
{
char ifname[IF_NAMESIZE];
struct sockaddr *rti_info[RTAX_MAX];
int mib[7];
size_t needed;
char *lim, *buf = NULL, *bufp, *next, *errmsg = NULL;
struct rt_msghdr *rtm;
struct sockaddr_in *sa_in;
struct sockaddr_rtlabel *sa_rl;
int s;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = AF_INET;
mib[4] = NET_RT_FLAGS;
mib[5] = RTF_GATEWAY;
mib[6] = imsg->rdomain;
while (1) {
if (sysctl(mib, 7, NULL, &needed, NULL, 0) == -1) {
errmsg = "sysctl size of routes:";
break;
}
if (needed == 0) {
free(buf);
return;
}
if ((bufp = realloc(buf, needed)) == NULL) {
free(buf);
errmsg = "routes buf malloc:";
continue;
}
buf = bufp;
if (sysctl(mib, 7, buf, &needed, NULL, 0) == -1) {
if (errno == ENOMEM)
continue;
free(buf);
errmsg = "sysctl retrieval of routes:";
break;
}
break;
}
if (errmsg) {
warning("route cleanup failed - %s %s (msize=%zu)",
errmsg, strerror(errno), needed);
return;
}
if ((s = socket(AF_ROUTE, SOCK_RAW, 0)) == -1)
error("opening socket to flush routes: %s", strerror(errno));
lim = buf + needed;
for (next = buf; next < lim; next += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)next;
if (rtm->rtm_version != RTM_VERSION)
continue;
populate_rti_info(rti_info, rtm);
sa_rl = (struct sockaddr_rtlabel *)rti_info[RTAX_LABEL];
sa_in = (struct sockaddr_in *)rti_info[RTAX_NETMASK];
switch (check_route_label(sa_rl)) {
case ROUTE_LABEL_DHCLIENT_OURS:
/* Always delete routes we labeled. */
delete_route(s, imsg->rdomain, rtm);
break;;
case ROUTE_LABEL_DHCLIENT_DEAD:
if (imsg->zapzombies)
delete_route(s, imsg->rdomain, rtm);
break;
case ROUTE_LABEL_DHCLIENT_LIVE:
case ROUTE_LABEL_DHCLIENT_UNKNOWN:
/* Another dhclient's responsibility. */
break;
case ROUTE_LABEL_NONE:
case ROUTE_LABEL_NOT_DHCLIENT:
/* Delete default routes on our interface. */
memset(ifname, 0, sizeof(ifname));
if (if_indextoname(rtm->rtm_index, ifname) &&
sa_in &&
sa_in->sin_addr.s_addr == INADDR_ANY &&
rtm->rtm_tableid == imsg->rdomain &&
strcmp(imsg->ifname, ifname) == 0)
delete_route(s, imsg->rdomain, rtm);
break;
default:
break;
}
}
close(s);
free(buf);
}
void
add_route(int rdomain, struct in_addr dest, struct in_addr netmask,
struct in_addr gateway, int addrs, int flags)
{
struct imsg_add_route imsg;
int rslt;
memset(&imsg, 0, sizeof(imsg));
imsg.rdomain = rdomain;
imsg.dest = dest;
imsg.gateway = gateway;
imsg.netmask = netmask;
imsg.addrs = addrs;
imsg.flags = flags;
rslt = imsg_compose(unpriv_ibuf, IMSG_ADD_ROUTE, 0, 0, -1,
&imsg, sizeof(imsg));
if (rslt == -1)
warning("add_route: imsg_compose: %s", strerror(errno));
}
void
priv_add_route(struct imsg_add_route *imsg)
{
struct rt_msghdr rtm;
struct sockaddr_in dest, gateway, mask;
struct sockaddr_rtlabel label;
struct iovec iov[5];
int s, i, iovcnt = 0;
if ((s = socket(AF_ROUTE, SOCK_RAW, 0)) == -1)
error("Routing Socket open failed: %s", strerror(errno));
/* Build RTM header */
memset(&rtm, 0, sizeof(rtm));
rtm.rtm_version = RTM_VERSION;
rtm.rtm_type = RTM_ADD;
rtm.rtm_tableid = imsg->rdomain;
rtm.rtm_priority = RTP_NONE;
rtm.rtm_msglen = sizeof(rtm);
rtm.rtm_addrs = imsg->addrs;
rtm.rtm_flags = imsg->flags;
iov[iovcnt].iov_base = &rtm;
iov[iovcnt++].iov_len = sizeof(rtm);
if (imsg->addrs & RTA_DST) {
memset(&dest, 0, sizeof(dest));
dest.sin_len = sizeof(dest);
dest.sin_family = AF_INET;
dest.sin_addr.s_addr = imsg->dest.s_addr;
rtm.rtm_msglen += sizeof(dest);
iov[iovcnt].iov_base = &dest;
iov[iovcnt++].iov_len = sizeof(dest);
}
if (imsg->addrs & RTA_GATEWAY) {
memset(&gateway, 0, sizeof(gateway));
gateway.sin_len = sizeof(gateway);
gateway.sin_family = AF_INET;
gateway.sin_addr.s_addr = imsg->gateway.s_addr;
rtm.rtm_msglen += sizeof(gateway);
iov[iovcnt].iov_base = &gateway;
iov[iovcnt++].iov_len = sizeof(gateway);
}
if (imsg->addrs & RTA_NETMASK) {
memset(&mask, 0, sizeof(mask));
mask.sin_len = sizeof(mask);
mask.sin_family = AF_INET;
mask.sin_addr.s_addr = imsg->netmask.s_addr;
rtm.rtm_msglen += sizeof(mask);
iov[iovcnt].iov_base = &mask;
iov[iovcnt++].iov_len = sizeof(mask);
}
/* Add our label so we can identify the route as our creation. */
if (create_route_label(&label) == 0) {
rtm.rtm_addrs |= RTA_LABEL;
rtm.rtm_msglen += sizeof(label);
iov[iovcnt].iov_base = &label;
iov[iovcnt++].iov_len = sizeof(label);
}
/* Check for EEXIST since other dhclient may not be done. */
for (i = 0; i < 5; i++) {
if (writev(s, iov, iovcnt) != -1)
break;
if (errno != EEXIST && errno != ENETUNREACH)
error("failed to add default route: %s",
strerror(errno));
sleep(1);
}
close(s);
}
/*
* Delete all existing inet addresses on interface.
*/
void
delete_addresses(char *ifname, int rdomain)
{
struct in_addr addr;
struct ifaddrs *ifap, *ifa;
if (getifaddrs(&ifap) != 0)
error("delete_addresses getifaddrs: %s", strerror(errno));
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if ((ifa->ifa_flags & IFF_LOOPBACK) ||
(ifa->ifa_flags & IFF_POINTOPOINT) ||
(!(ifa->ifa_flags & IFF_UP)) ||
(ifa->ifa_addr->sa_family != AF_INET) ||
(strcmp(ifi->name, ifa->ifa_name)))
continue;
memcpy(&addr, &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr,
sizeof(addr));
delete_address(ifi->name, ifi->rdomain, addr);
}
freeifaddrs(ifap);
}
/*
* [priv_]delete_address is the equivalent of
*
* ifconfig <ifname> inet <addr> delete
*/
void
delete_address(char *ifname, int rdomain, struct in_addr addr)
{
struct imsg_delete_address imsg;
int rslt;
memset(&imsg, 0, sizeof(imsg));
/* Note the address we are deleting for RTM_DELADDR filtering! */
deleting.s_addr = addr.s_addr;
strlcpy(imsg.ifname, ifname, sizeof(imsg.ifname));
imsg.rdomain = rdomain;
imsg.addr = addr;
rslt = imsg_compose(unpriv_ibuf, IMSG_DELETE_ADDRESS, 0, 0 , -1, &imsg,
sizeof(imsg));
if (rslt == -1)
warning("delete_address: imsg_compose: %s", strerror(errno));
/* Do flush to quickly kill previous dhclient, if any. */
rslt = imsg_flush(unpriv_ibuf);
if (rslt == -1 && errno != EPIPE)
warning("delete_address: imsg_flush: %s", strerror(errno));
}
void
priv_delete_address(struct imsg_delete_address *imsg)
{
struct ifaliasreq ifaliasreq;
struct sockaddr_in *in;
int s;
/*
* Delete specified address on specified interface.
*/
if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1)
error("socket open failed: %s", strerror(errno));
memset(&ifaliasreq, 0, sizeof(ifaliasreq));
strncpy(ifaliasreq.ifra_name, imsg->ifname,
sizeof(ifaliasreq.ifra_name));
in = (struct sockaddr_in *)&ifaliasreq.ifra_addr;
in->sin_family = AF_INET;
in->sin_len = sizeof(ifaliasreq.ifra_addr);
in->sin_addr.s_addr = imsg->addr.s_addr;
/* SIOCDIFADDR will result in a RTM_DELADDR message we must catch! */
if (ioctl(s, SIOCDIFADDR, &ifaliasreq) == -1) {
if (errno != EADDRNOTAVAIL)
warning("SIOCDIFADDR failed (%s): %s",
inet_ntoa(imsg->addr), strerror(errno));
close(s);
return;
}
close(s);
}
/*
* [priv_]add_address is the equivalent of
*
* ifconfig <if> inet <addr> netmask <mask> broadcast <addr>
*/
void
add_address(char *ifname, int rdomain, struct in_addr addr,
struct in_addr mask)
{
struct imsg_add_address imsg;
int rslt;
memset(&imsg, 0, sizeof(imsg));
/* Note the address we are adding for RTM_NEWADDR filtering! */
adding = addr;
strlcpy(imsg.ifname, ifname, sizeof(imsg.ifname));
imsg.rdomain = rdomain;
imsg.addr = addr;
imsg.mask = mask;
rslt = imsg_compose(unpriv_ibuf, IMSG_ADD_ADDRESS, 0, 0, -1, &imsg,
sizeof(imsg));
if (rslt == -1)
warning("add_address: imsg_compose: %s", strerror(errno));
}
void
priv_add_address(struct imsg_add_address *imsg)
{
struct ifaliasreq ifaliasreq;
struct sockaddr_in *in;
int s;
if (imsg->addr.s_addr == INADDR_ANY) {
/* Notification that the active_addr has been deleted. */
active_addr.s_addr = INADDR_ANY;
quit = INTERNALSIG;
return;
}
/*
* Add specified address on specified interface.
*/
if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1)
error("socket open failed: %s", strerror(errno));
memset(&ifaliasreq, 0, sizeof(ifaliasreq));
strncpy(ifaliasreq.ifra_name, imsg->ifname,
sizeof(ifaliasreq.ifra_name));
/* The actual address in ifra_addr. */
in = (struct sockaddr_in *)&ifaliasreq.ifra_addr;
in->sin_family = AF_INET;
in->sin_len = sizeof(ifaliasreq.ifra_addr);
in->sin_addr.s_addr = imsg->addr.s_addr;
/* And the netmask in ifra_mask. */
in = (struct sockaddr_in *)&ifaliasreq.ifra_mask;
in->sin_family = AF_INET;
in->sin_len = sizeof(ifaliasreq.ifra_mask);
memcpy(&in->sin_addr, &imsg->mask, sizeof(in->sin_addr));
/* No need to set broadcast address. Kernel can figure it out. */
if (ioctl(s, SIOCAIFADDR, &ifaliasreq) == -1)
warning("SIOCAIFADDR failed (%s): %s", inet_ntoa(imsg->addr),
strerror(errno));
close(s);
active_addr = imsg->addr;
}
/*
* Inform the [priv] process a HUP was received and it should restart.
*/
void
sendhup(struct client_lease *active)
{
struct imsg_hup imsg;
int rslt;
memset(&imsg, 0, sizeof(imsg));
strlcpy(imsg.ifname, ifi->name, sizeof(imsg.ifname));
imsg.rdomain = ifi->rdomain;
if (active)
imsg.addr = active->address;
rslt = imsg_compose(unpriv_ibuf, IMSG_HUP, 0, 0, -1,
&imsg, sizeof(imsg));
if (rslt == -1)
warning("cleanup: imsg_compose: %s", strerror(errno));
/* Do flush so cleanup message gets through immediately. */
rslt = imsg_flush(unpriv_ibuf);
if (rslt == -1 && errno != EPIPE)
warning("cleanup: imsg_flush: %s", strerror(errno));
}
/*
* priv_cleanup removes dhclient installed routes and address.
*/
void
priv_cleanup(struct imsg_hup *imsg)
{
struct imsg_flush_routes fimsg;
struct imsg_delete_address dimsg;
memset(&fimsg, 0, sizeof(fimsg));
fimsg.rdomain = imsg->rdomain;
fimsg.zapzombies = 0; /* Only zapzombies when binding a lease. */
priv_flush_routes(&fimsg);
if (imsg->addr.s_addr == INADDR_ANY)
return;
memset(&dimsg, 0, sizeof(dimsg));
strlcpy(dimsg.ifname, imsg->ifname, sizeof(imsg->ifname));
dimsg.rdomain = imsg->rdomain;
dimsg.addr = imsg->addr;
priv_delete_address(&dimsg);
}
int
resolv_conf_priority(int domain)
{
struct iovec iov[3];
struct {
struct rt_msghdr m_rtm;
char m_space[512];
} m_rtmsg;
struct sockaddr *rti_info[RTAX_MAX];
struct sockaddr_in sin;
struct sockaddr_rtlabel *sa_rl;
pid_t pid;
ssize_t len;
u_int32_t seq;
int s, rslt, iovcnt = 0;
rslt = 0;
s = socket(PF_ROUTE, SOCK_RAW, AF_INET);
if (s == -1) {
warning("default route socket: %s", strerror(errno));
return (0);
}
/* Build RTM header */
memset(&m_rtmsg, 0, sizeof(m_rtmsg));
m_rtmsg.m_rtm.rtm_version = RTM_VERSION;
m_rtmsg.m_rtm.rtm_type = RTM_GET;
m_rtmsg.m_rtm.rtm_msglen = sizeof(m_rtmsg.m_rtm);
m_rtmsg.m_rtm.rtm_flags = RTF_STATIC | RTF_GATEWAY | RTF_UP;
m_rtmsg.m_rtm.rtm_seq = seq = arc4random();
m_rtmsg.m_rtm.rtm_tableid = domain;
iov[iovcnt].iov_base = &m_rtmsg.m_rtm;
iov[iovcnt++].iov_len = sizeof(m_rtmsg.m_rtm);
/* Set destination & netmask addresses of all zeros. */
m_rtmsg.m_rtm.rtm_addrs = RTA_DST | RTA_NETMASK;
memset(&sin, 0, sizeof(sin));
sin.sin_len = sizeof(sin);
sin.sin_family = AF_INET;
iov[iovcnt].iov_base = &sin;
iov[iovcnt++].iov_len = sizeof(sin);
iov[iovcnt].iov_base = &sin;
iov[iovcnt++].iov_len = sizeof(sin);
m_rtmsg.m_rtm.rtm_msglen += 2 * sizeof(sin);
if (writev(s, iov, iovcnt) == -1) {
if (errno != ESRCH)
warning("RTM_GET of default route: %s",
strerror(errno));
goto done;
}
pid = getpid();
do {
len = read(s, &m_rtmsg, sizeof(m_rtmsg));
if (len == -1) {
warning("get default route read: %s", strerror(errno));
break;
} else if (len == 0) {
warning("no data from default route read");
break;
}
if (m_rtmsg.m_rtm.rtm_version != RTM_VERSION)
continue;
if (m_rtmsg.m_rtm.rtm_type == RTM_GET &&
m_rtmsg.m_rtm.rtm_pid == pid &&
m_rtmsg.m_rtm.rtm_seq == seq) {
if (m_rtmsg.m_rtm.rtm_errno) {
warning("default route read rtm: %s",
strerror(m_rtmsg.m_rtm.rtm_errno));
goto done;
}
break;
}
} while (1);
populate_rti_info(rti_info, &m_rtmsg.m_rtm);
sa_rl = (struct sockaddr_rtlabel *)rti_info[RTAX_LABEL];
if (check_route_label(sa_rl) == ROUTE_LABEL_DHCLIENT_OURS)
rslt = 1;
done:
close(s);
return (rslt);
}
int
create_route_label(struct sockaddr_rtlabel *label)
{
int len;
memset(label, 0, sizeof(*label));
label->sr_len = sizeof(label);
label->sr_family = AF_UNSPEC;
len = snprintf(label->sr_label, sizeof(label->sr_label), "DHCLIENT %d",
(int)getpid());
if (len == -1) {
warning("creating route label: %s", strerror(errno));
return (1);
}
if (len >= sizeof(label->sr_label)) {
warning("creating route label: label too long (%d vs %zd)", len,
sizeof(label->sr_label));
return (1);
}
return (0);
}
int
check_route_label(struct sockaddr_rtlabel *label)
{
pid_t pid;
if (!label)
return (ROUTE_LABEL_NONE);
if (strncmp("DHCLIENT ", label->sr_label, 9))
return (ROUTE_LABEL_NOT_DHCLIENT);
pid = (pid_t)strtonum(label->sr_label + 9, 1, INT_MAX, NULL);
if (pid <= 0)
return (ROUTE_LABEL_DHCLIENT_UNKNOWN);
if (pid == getpid())
return (ROUTE_LABEL_DHCLIENT_OURS);
if (kill(pid, 0) == -1) {
if (errno == ESRCH)
return (ROUTE_LABEL_DHCLIENT_DEAD);
else
return (ROUTE_LABEL_DHCLIENT_UNKNOWN);
}
return (ROUTE_LABEL_DHCLIENT_LIVE);
}
void
populate_rti_info(struct sockaddr **rti_info, struct rt_msghdr *rtm)
{
struct sockaddr *sa;
int i;
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
sa = (struct sockaddr *)((char *)(rtm) + rtm->rtm_hdrlen);
for (i = 0; i < RTAX_MAX; i++) {
if (rtm->rtm_addrs & (1 << i)) {
rti_info[i] = sa;
sa = (struct sockaddr *)((char *)(sa) +
ROUNDUP(sa->sa_len));
} else
rti_info[i] = NULL;
}
}
void
delete_route(int s, int rdomain, struct rt_msghdr *rtm)
{
static int seqno;
ssize_t rlen;
rtm->rtm_type = RTM_DELETE;
rtm->rtm_tableid = rdomain;
rtm->rtm_seq = seqno++;
rlen = write(s, (char *)rtm, rtm->rtm_msglen);
if (rlen == -1) {
if (errno != ESRCH)
error("RTM_DELETE write: %s", strerror(errno));
} else if (rlen < (int)rtm->rtm_msglen)
error("short RTM_DELETE write (%zd)\n", rlen);
}
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