diff --git a/sbin/dhclient/dhclient-script b/sbin/dhclient/dhclient-script index c5649e1a1d2a..bcc9050407d4 100755 --- a/sbin/dhclient/dhclient-script +++ b/sbin/dhclient/dhclient-script @@ -1,411 +1,410 @@ #!/bin/sh # # $OpenBSD: dhclient-script,v 1.6 2004/05/06 18:22:41 claudio Exp $ # $FreeBSD$ # # Copyright (c) 2003 Kenneth R Westerback # # 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. # # ARP=/usr/sbin/arp HOSTNAME=/bin/hostname IFCONFIG='/sbin/ifconfig -n' LOCALHOST=127.0.0.1 if [ -x /usr/bin/logger ]; then LOGGER="/usr/bin/logger -s -p user.notice -t dhclient" else LOGGER=echo fi # # Helper functions that implement common actions. # check_hostname() { current_hostname=`$HOSTNAME` if [ -z "$current_hostname" ]; then $LOGGER "New Hostname ($interface): $new_host_name" $HOSTNAME $new_host_name elif [ "$current_hostname" = "$old_host_name" -a \ "$new_host_name" != "$old_host_name" ]; then $LOGGER "New Hostname ($interface): $new_host_name" $HOSTNAME $new_host_name fi } arp_flush() { arp -an -i $interface | \ sed -n -e 's/^.*(\(.*\)) at .*$/arp -d \1/p' | \ sh >/dev/null 2>&1 } delete_old_address() { eval "$IFCONFIG $interface inet -alias $old_ip_address $medium" } add_new_address() { eval "$IFCONFIG $interface \ inet $new_ip_address \ netmask $new_subnet_mask \ broadcast $new_broadcast_address \ $medium" $LOGGER "New IP Address ($interface): $new_ip_address" $LOGGER "New Subnet Mask ($interface): $new_subnet_mask" $LOGGER "New Broadcast Address ($interface): $new_broadcast_address" $LOGGER "New Routers ($interface): $new_routers" } delete_old_alias() { if [ -n "$alias_ip_address" ]; then $IFCONFIG $interface inet -alias $alias_ip_address > /dev/null 2>&1 #route delete $alias_ip_address $LOCALHOST > /dev/null 2>&1 fi } add_new_alias() { if [ -n "$alias_ip_address" ]; then $IFCONFIG $interface inet alias $alias_ip_address netmask \ $alias_subnet_mask #route add $alias_ip_address $LOCALHOST fi } fill_classless_routes() { set $1 while [ $# -ge 5 ]; do if [ $1 -eq 0 ]; then route="default" elif [ $1 -le 8 ]; then route="$2.0.0.0/$1" shift elif [ $1 -le 16 ]; then route="$2.$3.0.0/$1" shift; shift elif [ $1 -le 24 ]; then route="$2.$3.$4.0/$1" shift; shift; shift else route="$2.$3.$4.$5/$1" shift; shift; shift; shift fi shift router="$1.$2.$3.$4" classless_routes="$classless_routes $route $router" shift; shift; shift; shift done } delete_old_routes() { #route delete "$old_ip_address" $LOCALHOST >/dev/null 2>&1 if [ -n "$old_classless_routes" ]; then fill_classless_routes "$old_classless_routes" set $classless_routes while [ $# -gt 1 ]; do route delete "$1" "$2" shift; shift done return 0; fi # If we supported multiple default routes, we'd be removing each # one here. We don't so just delete the default route if it's # through our interface. if is_default_interface; then route delete default >/dev/null 2>&1 fi if [ -n "$old_static_routes" ]; then set $old_static_routes while [ $# -gt 1 ]; do route delete "$1" "$2" shift; shift done fi arp_flush } add_new_routes() { #route add $new_ip_address $LOCALHOST >/dev/null 2>&1 # RFC 3442: If the DHCP server returns both a Classless Static # Routes option and a Router option, the DHCP client MUST ignore # the Router option. # # DHCP clients that support this option (Classless Static Routes) # MUST NOT install the routes specified in the Static Routes # option (option code 33) if both a Static Routes option and the # Classless Static Routes option are provided. if [ -n "$new_classless_routes" ]; then fill_classless_routes "$new_classless_routes" $LOGGER "New Classless Static Routes ($interface): $classless_routes" set $classless_routes while [ $# -gt 1 ]; do if [ "0.0.0.0" = "$2" ]; then route add "$1" -iface "$interface" else route add "$1" "$2" fi shift; shift done return fi for router in $new_routers; do if is_default_interface; then if [ "$new_ip_address" = "$router" ]; then route add default -iface $router >/dev/null 2>&1 else if [ "$new_subnet_mask" = "255.255.255.255" ]; then route add "$router" -iface "$interface" >/dev/null 2>&1 fi route add default $router >/dev/null 2>&1 fi fi # 2nd and subsequent default routers error out, so explicitly # stop processing the list after the first one. break done if [ -n "$new_static_routes" ]; then $LOGGER "New Static Routes ($interface): $new_static_routes" set $new_static_routes while [ $# -gt 1 ]; do route add $1 $2 shift; shift done fi } add_new_resolv_conf() { # XXX Old code did not create/update resolv.conf unless both # $new_domain_name and $new_domain_name_servers were provided. PR # #3135 reported some ISP's only provide $new_domain_name_servers and # thus broke the script. This code creates the resolv.conf if either # are provided. local tmpres=/var/run/resolv.conf.${interface} rm -f $tmpres if [ -n "$new_domain_search" ]; then echo "search $new_domain_search" >>$tmpres elif [ -n "$new_domain_name" ]; then echo "search $new_domain_name" >>$tmpres fi if [ -n "$new_domain_name_servers" ]; then for nameserver in $new_domain_name_servers; do echo "nameserver $nameserver" >>$tmpres done fi if [ -f $tmpres ]; then if [ -f /etc/resolv.conf.tail ]; then cat /etc/resolv.conf.tail >>$tmpres fi case $resolvconf_enable in # "no", "false", "off", or "0" [Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|[Oo][Ff][Ff]|0) # When resolv.conf is not changed actually, we don't # need to update it. # If /usr is not mounted yet, we cannot use cmp, then # the following test fails. In such case, we simply # ignore an error and do update resolv.conf. if cmp -s $tmpres /etc/resolv.conf; then rm -f $tmpres return 0 fi 2>/dev/null # In case (e.g. during OpenBSD installs) # /etc/resolv.conf is a symbolic link, take # care to preserve the link and write the new # data in the correct location. if [ -f /etc/resolv.conf ]; then cat /etc/resolv.conf > /etc/resolv.conf.save fi cat $tmpres > /etc/resolv.conf # Try to ensure correct ownership and permissions. chown -RL root:wheel /etc/resolv.conf chmod -RL 644 /etc/resolv.conf ;; *) /sbin/resolvconf -a ${interface} < $tmpres ;; esac rm -f $tmpres return 0 fi return 1 } # Must be used on exit. Invokes the local dhcp client exit hooks, if any. exit_with_hooks() { exit_status=$1 if [ -f /etc/dhclient-exit-hooks ]; then . /etc/dhclient-exit-hooks fi # probably should do something with exit status of the local script exit $exit_status } # Get the interface with the current ipv4 default route on it using only # commands that are available prior to /usr being mounted. is_default_interface() { routeget="`route -n get -inet default`" oldifs="$IFS" IFS=" " defif= for line in $routeget ; do case $line in *interface:*) defif=${line##*: } ;; esac done IFS=${oldifs} if [ -z "$defif" -o "$defif" = "$interface" ]; then return 0 else return 1 fi } # # Start of active code. # # Invoke the local dhcp client enter hooks, if they exist. if [ -f /etc/dhclient-enter-hooks ]; then exit_status=0 . /etc/dhclient-enter-hooks # allow the local script to abort processing of this state # local script must set exit_status variable to nonzero. if [ $exit_status -ne 0 ]; then exit $exit_status fi fi : ${resolvconf_enable="YES"} case $reason in MEDIUM) eval "$IFCONFIG $interface $medium" - eval "$IFCONFIG $interface inet -alias 0.0.0.0 $medium" >/dev/null 2>&1 sleep 1 ;; PREINIT) delete_old_alias - $IFCONFIG $interface inet alias 0.0.0.0 netmask 255.0.0.0 broadcast 255.255.255.255 up + eval "$IFCONFIG $interface up" ;; ARPCHECK|ARPSEND) ;; BOUND|RENEW|REBIND|REBOOT) check_hostname if [ -n "$old_ip_address" ]; then if [ "$old_ip_address" != "$alias_ip_address" ]; then delete_old_alias fi if [ "$old_ip_address" != "$new_ip_address" ]; then delete_old_address delete_old_routes fi fi if [ "$reason" = BOUND ] || \ [ "$reason" = REBOOT ] || \ [ -z "$old_ip_address" ] || \ [ "$old_ip_address" != "$new_ip_address" ]; then add_new_address add_new_routes fi if [ "$new_ip_address" != "$alias_ip_address" ]; then add_new_alias fi if is_default_interface; then add_new_resolv_conf fi ;; EXPIRE|FAIL) delete_old_alias if [ -n "$old_ip_address" ]; then delete_old_address delete_old_routes fi if [ -x $ARP ]; then $ARP -d -a -i $interface fi # XXX Why add alias we just deleted above? add_new_alias if is_default_interface; then case $resolvconf_enable in # "no", "false", "off", or "0" [Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|[Oo][Ff][Ff]|0) if [ -f /etc/resolv.conf.save ]; then cat /etc/resolv.conf.save > /etc/resolv.conf fi ;; *) /sbin/resolvconf -d ${interface} ;; esac fi ;; TIMEOUT) delete_old_alias add_new_address sleep 1 if [ -n "$new_routers" ]; then $LOGGER "New Routers ($interface): $new_routers" set "$new_routers" if ping -q -c 1 -t 1 "$1"; then if [ "$new_ip_address" != "$alias_ip_address" ]; then add_new_alias fi add_new_routes if ! is_default_interface; then exit_with_hooks 0 fi if add_new_resolv_conf; then exit_with_hooks 0 fi fi fi eval "$IFCONFIG $interface inet -alias $new_ip_address $medium" delete_old_routes exit_with_hooks 1 ;; esac exit_with_hooks 0 diff --git a/sbin/dhclient/dispatch.c b/sbin/dhclient/dispatch.c index 91f1694ec902..29ae73103913 100644 --- a/sbin/dhclient/dispatch.c +++ b/sbin/dhclient/dispatch.c @@ -1,578 +1,567 @@ /* $OpenBSD: dispatch.c,v 1.31 2004/09/21 04:07:03 david Exp $ */ /*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright 2004 Henning Brauer * Copyright (c) 1995, 1996, 1997, 1998, 1999 * The Internet Software Consortium. 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 Internet Software Consortium 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 INTERNET SOFTWARE CONSORTIUM 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 INTERNET SOFTWARE CONSORTIUM 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. * * This software has been written for the Internet Software Consortium * by Ted Lemon in cooperation with Vixie * Enterprises. To learn more about the Internet Software Consortium, * see ``http://www.vix.com/isc''. To learn more about Vixie * Enterprises, see ``http://www.vix.com''. */ #include __FBSDID("$FreeBSD$"); #include "dhcpd.h" #include "privsep.h" #include #include #include #include #include /* Assert that pointer p is aligned to at least align bytes */ #define assert_aligned(p, align) assert((((uintptr_t)p) & ((align) - 1)) == 0) static struct protocol *protocols; static struct timeout *timeouts; static struct timeout *free_timeouts; static int interfaces_invalidated; void (*bootp_packet_handler)(struct interface_info *, struct dhcp_packet *, int, unsigned int, struct iaddr, struct hardware *); static int interface_status(struct interface_info *ifinfo); /* * Use getifaddrs() to get a list of all the attached interfaces. For * each interface that's of type INET and not the loopback interface, * register that interface with the network I/O software, figure out * what subnet it's on, and add it to the list of interfaces. */ void discover_interfaces(struct interface_info *iface) { struct ifaddrs *ifap, *ifa; struct ifreq *tif; + int len = IFNAMSIZ + sizeof(struct sockaddr_storage); if (getifaddrs(&ifap) != 0) error("getifaddrs failed"); for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { if ((ifa->ifa_flags & IFF_LOOPBACK) || (ifa->ifa_flags & IFF_POINTOPOINT) || (!(ifa->ifa_flags & IFF_UP))) continue; if (strcmp(iface->name, ifa->ifa_name)) continue; /* * If we have the capability, extract link information * and record it in a linked list. */ if (ifa->ifa_addr->sa_family == AF_LINK) { struct sockaddr_dl *foo; /* * The implementation of getifaddrs should guarantee * this alignment */ assert_aligned(ifa->ifa_addr, _Alignof(struct sockaddr_dl)); #ifdef __clang__ #pragma clang diagnostic push #pragma clang diagnostic ignored "-Wcast-align" #endif foo = (struct sockaddr_dl *)ifa->ifa_addr; #ifdef __clang__ #pragma clang diagnostic pop #endif iface->index = foo->sdl_index; iface->hw_address.hlen = foo->sdl_alen; iface->hw_address.htype = HTYPE_ETHER; /* XXX */ memcpy(iface->hw_address.haddr, LLADDR(foo), foo->sdl_alen); - } else if (ifa->ifa_addr->sa_family == AF_INET) { - struct sockaddr_in foo; - struct iaddr addr; - - memcpy(&foo, ifa->ifa_addr, sizeof(foo)); - if (foo.sin_addr.s_addr == htonl(INADDR_LOOPBACK)) - continue; - if (!iface->ifp) { - if ((tif = calloc(1, sizeof(struct ifreq))) - == NULL) - error("no space to remember ifp"); - strlcpy(tif->ifr_name, ifa->ifa_name, IFNAMSIZ); - memcpy(&tif->ifr_addr, ifa->ifa_addr, - ifa->ifa_addr->sa_len); - iface->ifp = tif; - iface->primary_address = foo.sin_addr; - } - addr.len = 4; - memcpy(addr.iabuf, &foo.sin_addr.s_addr, addr.len); } + if (!iface->ifp) { + if ((tif = calloc(1, len)) == NULL) + error("no space to remember ifp"); + strlcpy(tif->ifr_name, ifa->ifa_name, IFNAMSIZ); + iface->ifp = tif; + } + } if (!iface->ifp) error("%s: not found", iface->name); /* Register the interface... */ if_register_receive(iface); if_register_send(iface); add_protocol(iface->name, iface->rfdesc, got_one, iface); freeifaddrs(ifap); } void reinitialize_interfaces(void) { interfaces_invalidated = 1; } /* * Wait for packets to come in using poll(). When a packet comes in, * call receive_packet to receive the packet and possibly strip hardware * addressing information from it, and then call through the * bootp_packet_handler hook to try to do something with it. */ void dispatch(void) { int count, live_interfaces, i, to_msec, nfds = 0; struct protocol *l; struct pollfd *fds; time_t howlong; for (l = protocols; l; l = l->next) nfds++; fds = malloc(nfds * sizeof(struct pollfd)); if (fds == NULL) error("Can't allocate poll structures."); do { /* * Call any expired timeouts, and then if there's still * a timeout registered, time out the select call then. */ another: if (timeouts) { struct timeout *t; if (timeouts->when <= cur_time) { t = timeouts; timeouts = timeouts->next; (*(t->func))(t->what); t->next = free_timeouts; free_timeouts = t; goto another; } /* * Figure timeout in milliseconds, and check for * potential overflow, so we can cram into an * int for poll, while not polling with a * negative timeout and blocking indefinitely. */ howlong = timeouts->when - cur_time; if (howlong > INT_MAX / 1000) howlong = INT_MAX / 1000; to_msec = howlong * 1000; } else to_msec = -1; /* Set up the descriptors to be polled. */ live_interfaces = 0; for (i = 0, l = protocols; l; l = l->next) { struct interface_info *ip = l->local; if (ip == NULL || ip->dead) continue; fds[i].fd = l->fd; fds[i].events = POLLIN; fds[i].revents = 0; i++; if (l->handler == got_one) live_interfaces++; } if (live_interfaces == 0) error("No live interfaces to poll on - exiting."); /* Wait for a packet or a timeout... XXX */ count = poll(fds, nfds, to_msec); /* Not likely to be transitory... */ if (count == -1) { if (errno == EAGAIN || errno == EINTR) { time(&cur_time); continue; } else error("poll: %m"); } /* Get the current time... */ time(&cur_time); i = 0; for (l = protocols; l; l = l->next) { struct interface_info *ip; ip = l->local; if ((fds[i].revents & (POLLIN | POLLHUP))) { fds[i].revents = 0; if (ip && (l->handler != got_one || !ip->dead)) (*(l->handler))(l); if (interfaces_invalidated) break; } i++; } interfaces_invalidated = 0; } while (1); } void got_one(struct protocol *l) { struct sockaddr_in from; struct hardware hfrom; struct iaddr ifrom; ssize_t result; union { /* * Packet input buffer. Must be as large as largest * possible MTU. */ unsigned char packbuf[4095]; struct dhcp_packet packet; } u; struct interface_info *ip = l->local; if ((result = receive_packet(ip, u.packbuf, sizeof(u), &from, &hfrom)) == -1) { warning("receive_packet failed on %s: %s", ip->name, strerror(errno)); ip->errors++; if ((!interface_status(ip)) || (ip->noifmedia && ip->errors > 20)) { /* our interface has gone away. */ warning("Interface %s no longer appears valid.", ip->name); ip->dead = 1; interfaces_invalidated = 1; close(l->fd); remove_protocol(l); free(ip); } return; } if (result == 0) return; if (bootp_packet_handler) { ifrom.len = 4; memcpy(ifrom.iabuf, &from.sin_addr, ifrom.len); (*bootp_packet_handler)(ip, &u.packet, result, from.sin_port, ifrom, &hfrom); } } int interface_status(struct interface_info *ifinfo) { char *ifname = ifinfo->name; int ifsock = ifinfo->rfdesc; struct ifreq ifr; struct ifmediareq ifmr; /* get interface flags */ memset(&ifr, 0, sizeof(ifr)); strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) { cap_syslog(capsyslog, LOG_ERR, "ioctl(SIOCGIFFLAGS) on %s: %m", ifname); goto inactive; } /* * if one of UP and RUNNING flags is dropped, * the interface is not active. */ if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) goto inactive; /* Next, check carrier on the interface, if possible */ if (ifinfo->noifmedia) goto active; memset(&ifmr, 0, sizeof(ifmr)); strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name)); if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) { if (errno != EINVAL) { cap_syslog(capsyslog, LOG_DEBUG, "ioctl(SIOCGIFMEDIA) on %s: %m", ifname); ifinfo->noifmedia = 1; goto active; } /* * EINVAL (or ENOTTY) simply means that the interface * does not support the SIOCGIFMEDIA ioctl. We regard it alive. */ ifinfo->noifmedia = 1; goto active; } if (ifmr.ifm_status & IFM_AVALID) { switch (ifmr.ifm_active & IFM_NMASK) { case IFM_ETHER: case IFM_IEEE80211: if (ifmr.ifm_status & IFM_ACTIVE) goto active; else goto inactive; break; default: goto inactive; } } inactive: return (0); active: return (1); } void add_timeout(time_t when, void (*where)(void *), void *what) { struct timeout *t, *q; /* See if this timeout supersedes an existing timeout. */ t = NULL; for (q = timeouts; q; q = q->next) { if (q->func == where && q->what == what) { if (t) t->next = q->next; else timeouts = q->next; break; } t = q; } /* If we didn't supersede a timeout, allocate a timeout structure now. */ if (!q) { if (free_timeouts) { q = free_timeouts; free_timeouts = q->next; q->func = where; q->what = what; } else { q = malloc(sizeof(struct timeout)); if (!q) error("Can't allocate timeout structure!"); q->func = where; q->what = what; } } q->when = when; /* Now sort this timeout into the timeout list. */ /* Beginning of list? */ if (!timeouts || timeouts->when > q->when) { q->next = timeouts; timeouts = q; return; } /* Middle of list? */ for (t = timeouts; t->next; t = t->next) { if (t->next->when > q->when) { q->next = t->next; t->next = q; return; } } /* End of list. */ t->next = q; q->next = NULL; } void cancel_timeout(void (*where)(void *), void *what) { struct timeout *t, *q; /* Look for this timeout on the list, and unlink it if we find it. */ t = NULL; for (q = timeouts; q; q = q->next) { if (q->func == where && q->what == what) { if (t) t->next = q->next; else timeouts = q->next; break; } t = q; } /* If we found the timeout, put it on the free list. */ if (q) { q->next = free_timeouts; free_timeouts = q; } } /* Add a protocol to the list of protocols... */ void add_protocol(const char *name, int fd, void (*handler)(struct protocol *), void *local) { struct protocol *p; p = malloc(sizeof(*p)); if (!p) error("can't allocate protocol struct for %s", name); p->fd = fd; p->handler = handler; p->local = local; p->next = protocols; protocols = p; } void remove_protocol(struct protocol *proto) { struct protocol *p, *prev; for (p = protocols, prev = NULL; p != NULL; prev = p, p = p->next) { if (p == proto) { if (prev == NULL) protocols = p->next; else prev->next = p->next; free(p); break; } } } int interface_link_status(char *ifname) { struct ifmediareq ifmr; int sock; if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) error("Can't create socket"); memset(&ifmr, 0, sizeof(ifmr)); strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name)); if (ioctl(sock, SIOCGIFMEDIA, (caddr_t)&ifmr) == -1) { /* EINVAL -> link state unknown. treat as active */ if (errno != EINVAL) cap_syslog(capsyslog, LOG_DEBUG, "ioctl(SIOCGIFMEDIA) on %s: %m", ifname); close(sock); return (1); } close(sock); if (ifmr.ifm_status & IFM_AVALID) { switch (ifmr.ifm_active & IFM_NMASK) { case IFM_ETHER: case IFM_IEEE80211: if (ifmr.ifm_status & IFM_ACTIVE) return (1); else return (0); } } return (1); } void interface_set_mtu_unpriv(int privfd, u_int16_t mtu) { struct imsg_hdr hdr; struct buf *buf; int errs = 0; hdr.code = IMSG_SET_INTERFACE_MTU; hdr.len = sizeof(hdr) + sizeof(u_int16_t); if ((buf = buf_open(hdr.len)) == NULL) error("buf_open: %m"); errs += buf_add(buf, &hdr, sizeof(hdr)); errs += buf_add(buf, &mtu, sizeof(mtu)); if (errs) error("buf_add: %m"); if (buf_close(privfd, buf) == -1) error("buf_close: %m"); } void interface_set_mtu_priv(char *ifname, u_int16_t mtu) { struct ifreq ifr; int sock; u_int16_t old_mtu; if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) error("Can't create socket"); memset(&ifr, 0, sizeof(ifr)); old_mtu = 0; strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); if (ioctl(sock, SIOCGIFMTU, (caddr_t)&ifr) == -1) warning("SIOCGIFMTU failed (%s): %s", ifname, strerror(errno)); else old_mtu = ifr.ifr_mtu; if (mtu != old_mtu) { ifr.ifr_mtu = mtu; if (ioctl(sock, SIOCSIFMTU, &ifr) == -1) warning("SIOCSIFMTU failed (%d): %s", mtu, strerror(errno)); } close(sock); }