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dhcpcd/if-bsd.c

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/*
* dhcpcd - DHCP client daemon
* Copyright (c) 2006-2010 Roy Marples <roy@marples.name>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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/ioctl.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <netinet/in.h>
#ifdef __DragonFly__
# include <netproto/802_11/ieee80211_ioctl.h>
#elif __APPLE__
/* FIXME: Add apple includes so we can work out SSID */
#else
# include <net80211/ieee80211_ioctl.h>
#endif
#include <errno.h>
#include <fnmatch.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "config.h"
#include "common.h"
#include "configure.h"
#include "dhcp.h"
#include "if-options.h"
#include "net.h"
#ifndef RT_ROUNDUP
#define RT_ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#define RT_ADVANCE(x, n) (x += RT_ROUNDUP((n)->sa_len))
#endif
/* FIXME: Why do we need to check for sa_family 255 */
#define COPYOUT(sin, sa) \
sin.s_addr = ((sa) != NULL) ? \
(((struct sockaddr_in *)(void *)sa)->sin_addr).s_addr : 0
static int r_fd = -1;
static char *link_buf;
static ssize_t link_buflen;
int
if_init(_unused struct interface *iface)
{
/* BSD promotes secondary address by default */
return 0;
}
int
if_conf(_unused struct interface *iface)
{
/* No extra checks needed on BSD */
return 0;
}
int
init_sockets(void)
{
if ((socket_afnet = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
return -1;
set_cloexec(socket_afnet);
if ((r_fd = socket(PF_ROUTE, SOCK_RAW, 0)) == -1)
return -1;
set_cloexec(r_fd);
return 0;
}
int
getifssid(const char *ifname, char *ssid)
{
int retval = -1;
#if defined(SIOCG80211NWID)
struct ifreq ifr;
struct ieee80211_nwid nwid;
#elif defined(IEEE80211_IOC_SSID)
struct ieee80211req ireq;
char nwid[IEEE80211_NWID_LEN + 1];
#endif
#if defined(SIOCG80211NWID) /* NetBSD */
memset(&ifr, 0, sizeof(ifr));
strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
memset(&nwid, 0, sizeof(nwid));
ifr.ifr_data = (void *)&nwid;
if (ioctl(socket_afnet, SIOCG80211NWID, &ifr) == 0) {
retval = nwid.i_len;
memcpy(ssid, nwid.i_nwid, nwid.i_len);
ssid[nwid.i_len] = '\0';
}
#elif defined(IEEE80211_IOC_SSID) /* FreeBSD */
memset(&ireq, 0, sizeof(ireq));
strlcpy(ireq.i_name, ifname, sizeof(ireq.i_name));
ireq.i_type = IEEE80211_IOC_SSID;
ireq.i_val = -1;
ireq.i_data = &nwid;
if (ioctl(socket_afnet, SIOCG80211, &ireq) == 0) {
retval = ireq.i_len;
memcpy(ssid, nwid, ireq.i_len);
ssid[ireq.i_len] = '\0';
}
#endif
return retval;
}
int
if_address(const struct interface *iface, const struct in_addr *address,
const struct in_addr *netmask, const struct in_addr *broadcast,
int action)
{
int retval;
struct ifaliasreq ifa;
union {
struct sockaddr *sa;
struct sockaddr_in *sin;
} _s;
memset(&ifa, 0, sizeof(ifa));
strlcpy(ifa.ifra_name, iface->name, sizeof(ifa.ifra_name));
#define ADDADDR(_var, _addr) { \
_s.sa = &_var; \
_s.sin->sin_family = AF_INET; \
_s.sin->sin_len = sizeof(*_s.sin); \
memcpy(&_s.sin->sin_addr, _addr, sizeof(_s.sin->sin_addr)); \
}
ADDADDR(ifa.ifra_addr, address);
ADDADDR(ifa.ifra_mask, netmask);
if (action >= 0 && broadcast) {
ADDADDR(ifa.ifra_broadaddr, broadcast);
}
#undef ADDADDR
if (action < 0)
retval = ioctl(socket_afnet, SIOCDIFADDR, &ifa);
else
retval = ioctl(socket_afnet, SIOCAIFADDR, &ifa);
return retval;
}
/* ARGSUSED4 */
int
if_route(const struct interface *iface, const struct in_addr *dest,
const struct in_addr *net, const struct in_addr *gate,
_unused int metric, int action)
{
union sockunion {
struct sockaddr sa;
struct sockaddr_in sin;
#ifdef INET6
struct sockaddr_in6 sin6;
#endif
struct sockaddr_dl sdl;
struct sockaddr_storage ss;
} su;
struct rtm
{
struct rt_msghdr hdr;
char buffer[sizeof(su) * 4];
} rtm;
char *bp = rtm.buffer, *p;
size_t l;
int retval = 0;
#define ADDSU(_su) { \
l = RT_ROUNDUP(_su.sa.sa_len); \
memcpy(bp, &(_su), l); \
bp += l; \
}
#define ADDADDR(_a) { \
memset (&su, 0, sizeof(su)); \
su.sin.sin_family = AF_INET; \
su.sin.sin_len = sizeof(su.sin); \
memcpy (&su.sin.sin_addr, _a, sizeof(su.sin.sin_addr)); \
ADDSU(su); \
}
memset(&rtm, 0, sizeof(rtm));
rtm.hdr.rtm_version = RTM_VERSION;
rtm.hdr.rtm_seq = 1;
if (action == 0)
rtm.hdr.rtm_type = RTM_CHANGE;
else if (action > 0)
rtm.hdr.rtm_type = RTM_ADD;
else
rtm.hdr.rtm_type = RTM_DELETE;
rtm.hdr.rtm_flags = RTF_UP;
/* None interface subnet routes are static. */
if (gate->s_addr != INADDR_ANY ||
net->s_addr != iface->net.s_addr ||
dest->s_addr != (iface->addr.s_addr & iface->net.s_addr))
rtm.hdr.rtm_flags |= RTF_STATIC;
rtm.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
if (dest->s_addr == gate->s_addr && net->s_addr == INADDR_BROADCAST)
rtm.hdr.rtm_flags |= RTF_HOST;
else {
rtm.hdr.rtm_addrs |= RTA_NETMASK;
if (rtm.hdr.rtm_flags & RTF_STATIC)
rtm.hdr.rtm_flags |= RTF_GATEWAY;
if (action >= 0)
rtm.hdr.rtm_addrs |= RTA_IFA;
}
ADDADDR(dest);
if (rtm.hdr.rtm_flags & RTF_HOST ||
!(rtm.hdr.rtm_flags & RTF_STATIC))
{
/* Make us a link layer socket for the host gateway */
memset(&su, 0, sizeof(su));
su.sdl.sdl_len = sizeof(struct sockaddr_dl);
link_addr(iface->name, &su.sdl);
ADDSU(su);
} else
ADDADDR(gate);
if (rtm.hdr.rtm_addrs & RTA_NETMASK) {
/* Ensure that netmask is set correctly */
memset(&su, 0, sizeof(su));
su.sin.sin_family = AF_INET;
su.sin.sin_len = sizeof(su.sin);
memcpy(&su.sin.sin_addr, &net->s_addr, sizeof(su.sin.sin_addr));
p = su.sa.sa_len + (char *)&su;
for (su.sa.sa_len = 0; p > (char *)&su;)
if (*--p != 0) {
su.sa.sa_len = 1 + p - (char *)&su;
break;
}
ADDSU(su);
}
if (rtm.hdr.rtm_addrs & RTA_IFA)
ADDADDR(&iface->addr);
rtm.hdr.rtm_msglen = l = bp - (char *)&rtm;
if (write(r_fd, &rtm, l) == -1)
retval = -1;
return retval;
}
int
open_link_socket(void)
{
int fd;
fd = socket(PF_ROUTE, SOCK_RAW, 0);
if (fd != -1) {
set_cloexec(fd);
set_nonblock(fd);
}
return fd;
}
static void
get_addrs(int type, char *cp, struct sockaddr **sa)
{
int i;
for (i = 0; i < RTAX_MAX; i++) {
if (type & (1 << i)) {
sa[i] = (struct sockaddr *)cp;
#ifdef DEBUG
printf ("got %d %d %s\n", i, sa[i]->sa_family,
inet_ntoa(((struct sockaddr_in *)sa[i])->
sin_addr));
#endif
RT_ADVANCE(cp, sa[i]);
} else
sa[i] = NULL;
}
}
int
manage_link(int fd)
{
char *p, *e, *cp;
char ifname[IF_NAMESIZE];
ssize_t bytes;
struct rt_msghdr *rtm;
struct if_announcemsghdr *ifan;
struct if_msghdr *ifm;
struct ifa_msghdr *ifam;
struct rt rt;
struct sockaddr *sa, *rti_info[RTAX_MAX];
int len;
#ifdef RTM_CHGADDR
struct sockaddr_dl sdl;
unsigned char *hwaddr;
#endif
for (;;) {
if (ioctl(fd, FIONREAD, &len) == -1)
return -1;
if (link_buflen < len) {
p = realloc(link_buf, len);
if (p == NULL)
return -1;
link_buf = p;
link_buflen = len;
}
bytes = read(fd, link_buf, link_buflen);
if (bytes == -1) {
if (errno == EAGAIN)
return 0;
if (errno == EINTR)
continue;
return -1;
}
e = link_buf + bytes;
for (p = link_buf; p < e; p += rtm->rtm_msglen) {
rtm = (struct rt_msghdr *)(void *)p;
switch(rtm->rtm_type) {
#ifdef RTM_IFANNOUNCE
case RTM_IFANNOUNCE:
ifan = (struct if_announcemsghdr *)(void *)p;
switch(ifan->ifan_what) {
case IFAN_ARRIVAL:
handle_interface(1, ifan->ifan_name);
break;
case IFAN_DEPARTURE:
handle_interface(-1, ifan->ifan_name);
break;
}
break;
#endif
case RTM_IFINFO:
ifm = (struct if_msghdr *)(void *)p;
memset(ifname, 0, sizeof(ifname));
if (if_indextoname(ifm->ifm_index, ifname))
handle_interface(0, ifname);
break;
case RTM_DELETE:
if (!(rtm->rtm_addrs & RTA_DST) ||
!(rtm->rtm_addrs & RTA_GATEWAY) ||
!(rtm->rtm_addrs & RTA_NETMASK))
break;
if (rtm->rtm_pid == getpid())
break;
cp = (char *)(void *)(rtm + 1);
sa = (struct sockaddr *)(void *)cp;
if (sa->sa_family != AF_INET)
break;
get_addrs(rtm->rtm_addrs, cp, rti_info);
rt.iface = NULL;
rt.next = NULL;
COPYOUT(rt.dest, rti_info[RTAX_DST]);
COPYOUT(rt.net, rti_info[RTAX_NETMASK]);
COPYOUT(rt.gate, rti_info[RTAX_GATEWAY]);
route_deleted(&rt);
break;
#ifdef RTM_CHGADDR
case RTM_CHGADDR: /* FALLTHROUGH */
#endif
case RTM_DELADDR: /* FALLTHROUGH */
case RTM_NEWADDR:
ifam = (struct ifa_msghdr *)(void *)p;
if (!if_indextoname(ifam->ifam_index, ifname))
break;
cp = (char *)(void *)(ifam + 1);
get_addrs(ifam->ifam_addrs, cp, rti_info);
if (rti_info[RTAX_IFA] == NULL)
break;
switch (rti_info[RTAX_IFA]->sa_family) {
#ifdef RTM_CHGADDR
case AF_LINK:
if (rtm->rtm_type != RTM_CHGADDR)
break;
memcpy(&sdl, rti_info[RTAX_IFA],
rti_info[RTAX_IFA]->sa_len);
hwaddr = xmalloc(sdl.sdl_alen);
memcpy(hwaddr, LLADDR(&sdl),
sdl.sdl_alen);
handle_hwaddr(ifname, hwaddr,
sdl.sdl_alen);
break;
#endif
case AF_INET:
case 255: /* FIXME: Why 255? */
COPYOUT(rt.dest, rti_info[RTAX_IFA]);
COPYOUT(rt.net, rti_info[RTAX_NETMASK]);
COPYOUT(rt.gate, rti_info[RTAX_BRD]);
handle_ifa(rtm->rtm_type, ifname,
&rt.dest, &rt.net, &rt.gate);
break;
}
break;
}
}
}
}
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