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1 #!/bin/sh
2 #-
3 # Copyright (c) 2016 Devin Teske
4 # All rights reserved.
5 #
6 # Redistribution and use in source and binary forms, with or without
7 # modification, are permitted provided that the following conditions
8 # are met:
9 # 1. Redistributions of source code must retain the above copyright
10 #    notice, this list of conditions and the following disclaimer.
11 # 2. Redistributions in binary form must reproduce the above copyright
12 #    notice, this list of conditions and the following disclaimer in the
13 #    documentation and/or other materials provided with the distribution.
14 #
15 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 # ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 # SUCH DAMAGE.
26 #
27 # $FreeBSD$
28 #
29 ############################################################ IDENT(1)
30 #
31 # $Title: if_bridge(4) management script for vnet jails $
32 #
33 ############################################################ INFORMATION
34 #
35 # Use this tool with jail.conf(5) (or rc.conf(5) ``legacy'' configuration) to
36 # manage `vnet' interfaces for jails. Designed to automate the creation of vnet
37 # interface(s) during jail `prestart' and destroy said interface(s) during jail
38 # `poststop'.
39 #
40 # In jail.conf(5) format:
41 #
42 # ### BEGIN EXCERPT ###
43 #
44 # xxx {
45 #       host.hostname = "xxx.yyy";
46 #       path = "/vm/xxx";
47
48 #       #
49 #       # NB: Below 2-lines required
50 #       # NB: The number of eNb_xxx interfaces should match the number of
51 #       #     arguments given to `jib addm xxx' in exec.prestart value.
52 #       #
53 #       vnet;
54 #       vnet.interface = e0b_xxx, e1b_xxx, ...;
55
56 #       exec.clean;
57 #       exec.system_user = "root";
58 #       exec.jail_user = "root";
59
60 #       #
61 #       # NB: Below 2-lines required
62 #       # NB: The number of arguments after `jib addm xxx' should match
63 #       #     the number of eNb_xxx arguments in vnet.interface value.
64 #       #
65 #       exec.prestart += "jib addm xxx em0 em1 ...";
66 #       exec.poststop += "jib destroy xxx";
67
68 #       # Standard recipe
69 #       exec.start += "/bin/sh /etc/rc";
70 #       exec.stop = "/bin/sh /etc/rc.shutdown jail";
71 #       exec.consolelog = "/var/log/jail_xxx_console.log";
72 #       mount.devfs;
73 #
74 #       # Optional (default off)
75 #       #allow.mount;
76 #       #allow.set_hostname = 1;
77 #       #allow.sysvipc = 1;
78 #       #devfs_ruleset = "11"; # rule to unhide bpf for DHCP
79 # }
80 #
81 # ### END EXCERPT ###
82 #
83 # In rc.conf(5) ``legacy'' format (used when /etc/jail.conf does not exist):
84 #
85 # ### BEGIN EXCERPT ###
86 #
87 # jail_enable="YES"
88 # jail_list="xxx"
89 #
90 # #
91 # # Global presets for all jails
92 # #
93 # jail_devfs_enable="YES"       # mount devfs
94 #
95 # #
96 # # Global options (default off)
97 # #
98 # #jail_mount_enable="YES"              # mount /etc/fstab.{name}
99 # #jail_set_hostname_allow="YES"        # Allow hostname to change
100 # #jail_sysvipc_allow="YES"             # Allow SysV Interprocess Comm.
101
102 # # xxx
103 # jail_xxx_hostname="xxx.shxd.cx"               # hostname
104 # jail_xxx_rootdir="/vm/xxx"                    # root directory
105 # jail_xxx_vnet_interfaces="e0b_xxx e1bxxx ..." # vnet interface(s)
106 # jail_xxx_exec_prestart0="jib addm xxx em0 em1 ..."    # bridge interface(s)
107 # jail_xxx_exec_poststop0="jib destroy xxx"     # destroy interface(s)
108 # #jail_xxx_mount_enable="YES"                  # mount /etc/fstab.xxx
109 # #jail_xxx_devfs_ruleset="11"                  # rule to unhide bpf for DHCP
110 #
111 # ### END EXCERPT ###
112 #
113 # Note that the legacy rc.conf(5) format is converted to
114 # /var/run/jail.{name}.conf by /etc/rc.d/jail if jail.conf(5) is missing.
115 #
116 # ASIDE: dhclient(8) inside a vnet jail...
117 #
118 # To allow dhclient(8) to work inside a vnet jail, make sure the following
119 # appears in /etc/devfs.rules (which should be created if it doesn't exist):
120 #
121 #       [devfsrules_jail=11]
122 #       add include $devfsrules_hide_all
123 #       add include $devfsrules_unhide_basic
124 #       add include $devfsrules_unhide_login
125 #       add path 'bpf*' unhide
126 #
127 # And set ether devfs.ruleset="11" (jail.conf(5)) or
128 # jail_{name}_devfs_ruleset="11" (rc.conf(5)).
129 #
130 # NB: While this tool can't create every type of desirable topology, it should
131 # handle most setups, minus some which considered exotic or purpose-built.
132 #
133 ############################################################ GLOBALS
134
135 pgm="${0##*/}" # Program basename
136
137 #
138 # Global exit status
139 #
140 SUCCESS=0
141 FAILURE=1
142
143 ############################################################ FUNCTIONS
144
145 usage()
146 {
147         local action usage descr
148         exec >&2
149         echo "Usage: $pgm action [arguments]"
150         echo "Actions:"
151         for action in \
152                 addm            \
153                 show            \
154                 show1           \
155                 destroy         \
156         ; do
157                 eval usage=\"\$jib_${action}_usage\"
158                 [ "$usage" ] || continue
159                 eval descr=\"\$jib_${action}_descr\"
160                 printf "\t%s\n\t\t%s\n" "$usage" "$descr"
161         done
162         exit $FAILURE
163 }
164
165 action_usage()
166 {
167         local usage descr action="$1"
168         eval usage=\"\$jib_${action}_usage\"
169         echo "Usage: $pgm $usage" >&2
170         eval descr=\"\$jib_${action}_descr\"
171         printf "\t%s\n" "$descr"
172         exit $FAILURE
173 }
174
175 derive_mac()
176 {
177         local OPTIND=1 OPTARG __flag
178         local __mac_num= __make_pair=
179         while getopts 2n: __flag; do
180                 case "$__flag" in
181                 2) __make_pair=1 ;;
182                 n) __mac_num=${OPTARG%%[^0-9]*} ;;
183                 esac
184         done
185         shift $(( $OPTIND - 1 ))
186
187         if [ ! "$__mac_num" ]; then
188                 eval __mac_num=\${_${iface}_num:--1}
189                 __mac_num=$(( $__mac_num + 1 ))
190                 eval _${iface}_num=\$__mac_num
191         fi
192
193         local __iface="$1" __name="$2" __var_to_set="$3" __var_to_set_b="$4"
194         local __iface_devid __new_devid __num __new_devid_b
195         #
196         # Calculate MAC address derived from given iface.
197         #
198         # The formula I'm using is ``NP:SS:SS:II:II:II'' where:
199         # + N denotes 4 bits used as a counter to support branching
200         #   each parent interface up to 15 times under the same jail
201         #   name (see S below).
202         # + P denotes the special nibble whose value, if one of
203         #   2, 6, A, or E (but usually 2) denotes a privately
204         #   administered MAC address (while remaining routable).
205         # + S denotes 16 bits, the sum(1) value of the jail name.
206         # + I denotes bits that are inherited from parent interface.
207         #
208         # The S bits are a CRC-16 checksum of NAME, allowing the jail
209         # to change link numbers in ng_bridge(4) without affecting the
210         # MAC address. Meanwhile, if...
211         #   + the jail NAME changes (e.g., it was duplicated and given
212         #     a new name with no other changes)
213         #   + the underlying network interface changes
214         #   + the jail is moved to another host
215         # the MAC address will be recalculated to a new, similarly
216         # unique value preventing conflict.
217         #
218         __iface_devid=$( ifconfig $__iface ether | awk '/ether/,$0=$2' )
219         # ??:??:??:II:II:II
220         __new_devid=${__iface_devid#??:??:??} # => :II:II:II
221         # => :SS:SS:II:II:II
222         __num=$( set -- `echo -n "$__name" | sum` && echo $1 )
223         __new_devid=$( printf :%02x:%02x \
224                 $(( $__num >> 8 & 255 )) $(( $__num & 255 )) )$__new_devid
225         # => P:SS:SS:II:II:II
226         case "$__iface_devid" in
227            ?2:*) __new_devid=a$__new_devid __new_devid_b=e$__new_devid ;;
228         ?[Ee]:*) __new_devid=2$__new_devid __new_devid_b=6$__new_devid ;;
229               *) __new_devid=2$__new_devid __new_devid_b=e$__new_devid
230         esac
231         # => NP:SS:SS:II:II:II
232         __new_devid=$( printf %x $(( $__mac_num & 15 )) )$__new_devid
233         __new_devid_b=$( printf %x $(( $__mac_num & 15 )) )$__new_devid_b
234
235         #
236         # Return derivative MAC address(es)
237         #
238         if [ "$__make_pair" ]; then
239                 if [ "$__var_to_set" -a "$__var_to_set_b" ]; then
240                         eval $__var_to_set=\$__new_devid
241                         eval $__var_to_set_b=\$__new_devid_b
242                 else
243                         echo $__new_devid $__new_devid_b
244                 fi
245         else
246                 if [ "$__var_to_set" ]; then
247                         eval $__var_to_set=\$__new_devid
248                 else
249                         echo $__new_devid
250                 fi
251         fi
252 }
253
254 mustberoot_to_continue()
255 {
256         if [ "$( id -u )" -ne 0 ]; then
257                 echo "Must run as root!" >&2
258                 exit $FAILURE
259         fi
260 }
261
262 jib_addm_usage="addm [-b BRIDGE_NAME] NAME [!]iface0 [[!]iface1 ...]"
263 jib_addm_descr="Creates e0b_NAME [e1b_NAME ...]"
264 jib_addm()
265 {
266         local OPTIND=1 OPTARG flag bridge=bridge
267         while getopts b: flag; do
268                 case "$flag" in
269                 b) bridge="${OPTARG:-bridge}" ;;
270                 *) action_usage addm # NOTREACHED
271                 esac
272         done
273         shift $(( $OPTIND - 1 ))
274
275         local name="$1"
276         [ "${name:-x}" = "${name#*[!0-9a-zA-Z_]}" -a $# -gt 1 ] ||
277                 action_usage addm # NOTREACHED
278         shift 1 # name
279
280         mustberoot_to_continue
281
282         local iface eiface_devid_a eiface_devid_b
283         local new no_derive num quad i=0
284         for iface in $*; do
285
286                 no_derive=
287                 case "$iface" in
288                 !*) iface=${iface#!} no_derive=1 ;;
289                 esac
290
291                 # Make sure the interface doesn't exist already
292                 if ifconfig "e${i}a_$name" > /dev/null 2>&1; then
293                         i=$(( $i + 1 ))
294                         continue
295                 fi
296
297                 # Bring the interface up
298                 ifconfig $iface up || return
299
300                 # Make sure the interface has been bridged
301                 if ! ifconfig "$iface$bridge" > /dev/null 2>&1; then
302                         new=$( ifconfig bridge create ) || return
303                         ifconfig $new addm $iface || return
304                         ifconfig $new name "$iface$bridge" || return
305                         ifconfig "$iface$bridge" up || return
306                 fi
307
308                 # Create a new interface to the bridge
309                 new=$( ifconfig epair create ) || return
310                 ifconfig "$iface$bridge" addm $new || return
311
312                 # Rename the new interface
313                 ifconfig $new name "e${i}a_$name" || return
314                 ifconfig ${new%a}b name "e${i}b_$name" || return
315                 ifconfig "e${i}a_$name" up || return
316                 ifconfig "e${i}b_$name" up || return
317
318                 #
319                 # Set the MAC address of the new interface using a sensible
320                 # algorithm to prevent conflicts on the network.
321                 #
322                 eiface_devid_a= eiface_devid_b=
323                 [ "$no_derive" ] || derive_mac -2 $iface "$name" \
324                         eiface_devid_a eiface_devid_b
325                 if [ "$eiface_devid_a" -a "$eiface_devid_b" ]; then
326                         ifconfig "e${i}a_$name" ether $eiface_devid_a
327                         ifconfig "e${i}b_$name" ether $eiface_devid_b
328                 fi > /dev/null 2>&1
329
330                 i=$(( $i + 1 ))
331         done # for iface
332 }
333
334 jib_show_usage="show"
335 jib_show_descr="List possible NAME values for \`show NAME'"
336 jib_show1_usage="show NAME"
337 jib_show1_descr="Lists e0b_NAME [e1b_NAME ...]"
338 jib_show2_usage="show [NAME]"
339 jib_show()
340 {
341         local OPTIND=1 OPTARG flag
342         while getopts "" flag; do
343                 case "$flag" in
344                 *) action_usage show2 # NOTREACHED
345                 esac
346         done
347         shift $(( $OPTIND - 1 ))
348         if [ $# -eq 0 ]; then
349                 ifconfig | awk '
350                         /^[^:[:space:]]+:/ {
351                                 iface = $1
352                                 sub(/:.*/, "", iface)
353                                 next
354                         }
355                         $1 == "groups:" {
356                                 for (n = split($0, group); n > 1; n--) {
357                                         if (group[n] != "bridge") continue
358                                         print iface
359                                         next
360                                 }
361                         }' |
362                         xargs -rn1 ifconfig |
363                         awk '$1 == "member:" &&
364                                 sub(/^e[[:digit:]]+a_/, "", $2), $0 = $2' |
365                         sort -u
366                 return
367         fi
368         ifconfig | awk -v name="$1" '
369                 match($0, /^e[[:digit:]]+a_/) && sub(/:.*/, "") &&
370                         substr($1, RSTART + RLENGTH) == name
371         ' | sort
372 }
373
374 jib_destroy_usage="destroy NAME"
375 jib_destroy_descr="Destroy e0b_NAME [e1b_NAME ...]"
376 jib_destroy()
377 {
378         local OPTIND=1 OPTARG flag
379         while getopts "" flag; do
380                 case "$flag" in
381                 *) action_usage destroy # NOTREACHED
382                 esac
383         done
384         shift $(( $OPTIND -1 ))
385         local name="$1"
386         [ "${name:-x}" = "${name#*[!0-9a-zA-Z_]}" -a $# -eq 1 ] ||
387                 action_usage destroy # NOTREACHED
388         mustberoot_to_continue
389         jib_show "$name" | xargs -rn1 -I eiface ifconfig eiface destroy
390 }
391
392 ############################################################ MAIN
393
394 #
395 # Command-line arguments
396 #
397 action="$1"
398 [ "$action" ] || usage # NOTREACHED
399
400 #
401 # Validate action argument
402 #
403 if [ "$BASH_VERSION" ]; then
404         type="$( type -t "jib_$action" )" || usage # NOTREACHED
405 else
406         type="$( type "jib_$action" 2> /dev/null )" || usage # NOTREACHED
407 fi
408 case "$type" in
409 *function)
410         shift 1 # action
411         eval "jib_$action" \"\$@\"
412         ;;
413 *) usage # NOTREACHED
414 esac
415
416 ################################################################################
417 # END
418 ################################################################################