summaryrefslogtreecommitdiff
blob: dd325a33f4d04bac574cf722a8dd0a537a721697 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
#!/bin/bash
# Copyright (c) 2004-2006 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

# We will be loaded after conf.d/rc and conf.d/net so we can set a default
# here.
RC_AUTO_INTERFACE="${RC_AUTO_INTERFACE:-no}"

netdir="/var/lib/net-scripts"
statedir="${netdir}/state"

# Contributed by Roy Marples (uberlord@gentoo.org)

# char* interface_device(char *iface)
#
# Gets the base device of the interface
# Can handle eth0:1 and eth0.1
# Which returns eth0 in this case
interface_device() {
	local dev="${1%%.*}"
	[[ ${dev} == "$1" ]] && dev="${1%%:*}"
	echo "${dev}"
}

# char* interface_type(char* iface)
#
# Returns the base type of the interface
# eth, ippp, etc
interface_type() {
	echo "${1%%[0-9]*}"
}

# void save_state(char *interface)
#
# Saves state information regarding the interface
save_state() {
	local iface="$1"
	local d="${statedir}/${iface}"

	[[ ! -d ${d} ]] && mkdir -m 0755 -p "${d}"
	cp -p /etc/resolv.conf /etc/ntp.conf /etc/yp.conf "${d}" 2>/dev/null
}

# void remove_state(char *interface)
#
# Removes state information regarding the interface
remove_state() {
	local d="${statedir}/$1"

	[[ -d ${d} ]] && rm -Rf "${d}" 2>/dev/null
	[[ ! ${2:-true} ]] && mkdir -m 0755 -p "${d}"
}

# void apply_state(char *interface)
#
# Apply's state information about the interface to the system
# If the files in the state dir are not links back to etc then
# we create them if RC_AUTO_INTERFACE="yes"
#
apply_state() {
	local iface="$1"

	if [[ -z ${iface} ]]; then
		iface=$( select_best_interface )
		[[ -z ${iface} ]] && return
	fi

	local d="${statedir}/${iface}"
	if [[ -d ${d} ]]; then
		local files=$( ls "${d}" )
		if [[ -n ${files} ]] ; then
			if [[ ${RC_AUTO_INTERFACE} == "yes" ]]; then
				cp -pPR "${d}"/* "${netdir}"
				local file 
				for file in ${files} ; do
					# Skip .sv files
					[[ ${file} == *".sv" ]] && contine
					local link=$( readlink "/etc/${file}" 2>/dev/null )
					if [[ ${link} != "${netdir}/${file}" ]]; then
						[[ -e "/etc/${file}" ]] && rm -f "/etc/${file}"
						ln -snf "${netdir}/${file}" "/etc/${file}"
					fi
				done
			else
				cp -pPR "${d}"/* /etc
			fi
		fi
	fi

	[[ ${RC_AUTO_INTERFACE} == "yes" ]] && merge_configs
}

# char* order_interfaces(bool require_gateway)
#
# Lists the interfaces in route metric order that we have configured
# (ie a state dir exists)
# require_gateway defaults to false
order_interfaces() {
	local ifaces extra

	${1:-false} && extra=' && $2=="00000000"'
	ifaces=$(awk '{if (NR>1 && $1!="lo"'"${extra}"') print $7, $1}' /proc/net/route \
		| sort -n | cut -d' ' -f2 | uniq)

	# Append lo if it's up
	if ! ${1:-false} ; then
		if grep -q "^lo[ \t]*" /proc/net/route ; then
			ifaces="${ifaces} lo"
		fi
	fi

	local i order
	for i in ${ifaces}; do
		[[ -d "${statedir}/${i}" ]] && order="${order}${i} "
	done

	echo "${order}"
}

# void merge_resolv()
#
# Merges the resolv.conf info from active interfaces
merge_resolv() {
	local -a ifaces=( $(order_interfaces) )
	local i j f

	# We only work for ifaces with a resolv.conf
	j=${#ifaces[@]}
	for (( i=0; i<j; i++ )); do
		[[ ! -e "${statedir}/${ifaces[i]}/resolv.conf" ]] && unset ifaces[i]
	done
	ifaces=( "${ifaces[@]}" )

	# No point merging unless there are two or more interfaces
	[[ ${#ifaces[@]} -lt 2 ]] && return

	veinfo "Merging resolv.conf from interfaces ${ifaces[@]}"
	
	local -a search srvs opts sortlist
	j=0
	for (( i=0; i<${#ifaces[@]}; i++ )); do
		f="${statedir}/${ifaces[i]}/resolv.conf"
		srvs[i]=$( sed -n -e 's/^[ \t]*nameserver[ \t]*\([^#]*\).*/\1/p' "${f}" \
			| sed 2q )
		
		search[i]=$( sed -n -e 's/^[ \t]*\(domain\|search\)[ \t]*\([^#]*\).*/\2/p' \
			"${f}" | sed -e '$!d' )

		opts[i]=$( sed -n -e 's/^[ \t]*options[ \t]*\([^#]*\).*/\1#/p;' "${f}" | xargs )
		sortlist[i]=$( sed -n -e 's/^[ \t]*sortlist[ \t]*\([^#]*\).*/\1/p' "${f}" )
		
		if [[ -z ${srvs[i]} && -z ${opts[i]} && -z ${sortlist[i]} && -z ${search[i]} ]]; then
			unset srvs[i]
			unset search[i]
			unset opts[i]
			unset sortlist[i]
			continue
		fi
		
		# No point in handling more than 3 interfaces due to libc limits
		(( j++ ))
		[[ ${j} -gt 2 ]] && break
	done
	srvs=( "${srvs[@]}" )
	search=( ${search[@]} )
	opts=( "${opts[@]}" )
	sortlist=( ${sortlist[@]} )

	local new_srvs
	j=0
	# Add interface primary nameservers
	for (( i=0;i<${#srvs[@]}; i++ )); do
		local -a n=( ${srvs[i]} )
		if [[ " ${new_srvs} " != *" ${n[0]} "* ]]; then
			new_srvs="${new_srvs} ${n[0]}"
			# libc can only handle 3 name servers
			(( j++ ))
			[[ ${j} -gt 2 ]] && break
		fi
	done

	# Add interface secondary nameservers
	if [[ ${j} -lt 3 ]]; then
		for (( i=0;i<${#srvs[@]}; i++ )); do
			local -a n=( ${srvs[i]} )
			[[ -z ${n[1]} ]] && continue
			if [[ " ${new_srvs} " != *" ${n[1]} "* ]]; then
				new_srvs="${new_srvs} ${n[1]}"
				# libc can only handle 3 name servers
				(( j++ ))
				[[ ${j} -gt 2 ]] && break
			fi
		done
	fi

	local new_search n_search=0
	for i in ${search[@]}; do
		if [[ " ${new_search} " != *" ${i} "* ]]; then
			new_search="${new_search} ${i}"
			# libc limits us to 6 search domains
			(( n_search++ ))
			[[ ${n_search} -gt 5 ]] && break
		fi
	done

	local new_opts
	for i in "${opts[@]}"; do
		new_opts="${new_opts}#${i}"
	done

	# Remove duplicate options
	new_opts=$(
		echo -e "${new_opts//\#/\n}" \
		| sort -u | sed -e 's/^/#/g' | xargs
	)

	local new_sortlist n_sortlist=0
	for i in ${sortlist[@]}; do
		if [[ " ${new_sortlist} " != *" ${i} "* ]]; then
			new_sortlist="${new_sortlist} ${i}"
			# libc limits us to 10 items
			(( n_sortlist++ ))
			[[ ${n_sortlist} -gt 9 ]] && break
		fi
	done

	# Now we create a new resolv.conf to use
	local f="${netdir}/resolv.conf.$$"
	echo "# Generated by net-scripts from interfaces ${ifaces[@]}" > "${f}"
	chmod 644 "${f}"
	for i in ${new_srvs[@]}; do
		echo "nameserver ${i}" >> "${f}"
	done
	if [[ -n ${new_search} ]]; then
		if [[ ${n_search} == "1" ]]; then
			echo "domain${new_search}" >> "${f}"
		else
			echo "search${new_search}" >> "${f}"
		fi
	fi

	[[ -n ${new_sortlist} ]] && echo "sortlist${new_sortlist}" >> "${f}"
	
	# We seperated the options out using # in our sed call above
	# so we set IFS here. If you do any spliting futher down in this function
	# then you will need to reset IFS.
	local IFS="#"
	for i in ${new_opts}; do
		[[ -n ${i# } ]] && echo "options ${i# }" >> "${f}"
	done
	
	mv "${f}" "${netdir}/resolv.conf"
}


# void merge_ntp()
#
# Merges the ntp.conf info from active interfaces
merge_ntp() {
	local -a ifaces=( $(order_interfaces) )
	local i j f

	# We only work for ifaces with a ntp.conf
	j=${#ifaces[@]}
	for (( i=0; i<j; i++ )); do
		[[ ! -e "${statedir}/${ifaces[i]}/ntp.conf" ]] && unset ifaces[i]
	done
	ifaces=( "${ifaces[@]}" )
	
	# No point merging unless there are two or more interfaces
	[[ ${#ifaces[@]} -lt 2 ]] && return

	veinfo "Merging ntp.conf from interfaces ${ifaces[@]}"
	
	local srvs
	for (( i=0; i<${#ifaces[@]}; i++ )); do
		f="${statedir}/${ifaces[i]}/ntp.conf"
		srvs="${srvs} $( sed -n -e 's/^[ \t]*server[ \t]*\([^#]\)/\1/p' "${f}" )"
	done

	# ntp does it's own preference list, so we just remove duplicates
    sort_unique() {
		set -- " ${@/%/\n}"
		echo -e "$@" | sort -u
	}

	srvs=$( sort_unique ${srvs} )

	f="${netdir}/ntp.conf.$$"
    echo "# Generated by net-scripts for interfaces ${ifaces[@]}" > "${f}"
    chmod 644 "${f}"

    echo "restrict default noquery notrust nomodify" >> "${f}"
    echo "restrict 127.0.0.1" >> "${f}"

    for i in ${srvs}; do
        echo "restrict ${i} nomodify notrap noquery" >> "${f}"
        echo "server ${i}" >> "${f}"
    done

    echo "driftfile /var/lib/ntp/ntp.drift" >> "${f}"
    echo "logfile /var/log/ntp.log" >> "${f}"

    mv "${f}" "${netdir}/ntp.conf"
}

# void merge_configs()
#
# Merge config files together
merge_configs() {
	merge_resolv
	merge_ntp
}

# char* select_best_interface()
#
# Selects the best interface to apply state information to
# This is currently based on routing metrics
select_best_interface() {
	local -a ifs=( $(order_interfaces) )

	# Move lo to the back of the pecking order of it's active
	local x=" ${ifs[@]} "
	[[ ${x// lo / } != "${x}" ]] && ifs=( ${x// lo / } lo )

	local iface
	for iface in ${ifs[@]} ; do
		if [[ -e "${statedir}/${iface}/resolv.conf" ]]; then
			echo "${iface}"
			return 0
		fi
	done

	echo "${ifs[0]}"
}

# int calculate_metric(char *interface)
#
# Calculates the best metric for the interface
# The Linux kernel does not use this at the moment, but we use it so that
# default routes remain and we can work out the "best" interface
calculate_metric() {
	local iface="$1" exclude='$1!="Iface" && $1!="lo"'

	# Have we already got a metric?
	local m=$( awk '$1=="'${iface}'" && $2=="00000000" { print $7 }' \
		/proc/net/route )
	if [[ -n ${m} ]]; then
		echo "${m}"
		return 0
	fi

	local itype=$( interface_type "${iface}" ) x i

	# If we're not a wireless device then exclude wireless from the
	# routing table so we stay < 1000
	if [[ -e /proc/net/wireless ]]; then
		if ! grep -q "^[ \t]*${iface}:[ \t]" /proc/net/wireless ; then
			local i=$( sed -n -e 's/^[ \t]*\(.*\):.*/\1/p' /proc/net/wireless )
			for x in ${i} ; do
				exclude="${exclude} && "'$1'"!=\"${x}\""
			done
		fi
	fi

	# Exclude ppp and ippp as well
	local ix="ppp|ippp"
	[[ ${itype} == "ppp" ]] && ix="ippp"
	[[ ${itype} == "ippp" ]] && ix="ppp"
	i=$( sed -n -e 's/^[ ]*\('${ix}'[0-9]*\):.*$/\1/p' /proc/net/dev )
	for x in ${i} ; do
		exclude="${exclude} && "'$1'"!=\"${x}\""
	done

	local m=$( awk "${exclude} { print "'$7'" }" /proc/net/route \
		| sort -rn | head -n 1 | cut -d' ' -f2 )
	m="${m:--1}"
	(( m ++ ))

	# If we're a wireless device then add 1000 so that wired interfaces take preference
	if [[ -e /proc/net/wireless ]]; then
		grep -q "^[ \t]*${iface}:[ \t]" /proc/net/wireless && (( m+= 1000 ))
	fi

	# If we're a ppp device then we add 2000 for ISDN, otherwise 3000
	[[ ${itype} == "ippp" ]] && (( m+= 2000 ))
	[[ ${itype} == "ppp" ]] && (( m+= 3000 ))

	echo "${m}"
}

# int netmask2cidr(char *netmask)
#
# Returns the CIDR of a given netmask
netmask2cidr() {
	local binary="" i bin

	for i in ${1//./ }; do
		bin=""
		while [[ ${i} != "0" ]]; do
			bin=$[${i}%2]${bin}
			(( i=i>>1 ))
		done
		binary="${binary}${bin}"
	done
	binary="${binary%%0*}"
	echo "${#binary}"
}

# char* netmask2cidr(int cidr)
#
# Returns the netmask of a given CIDR
cidr2netmask() {
	local cidr="$1" netmask="" done=0 i sum=0 cur=128
	local octets frac

	(( octets=cidr/8 ))
	(( frac=cidr%8 ))
	while [[ octets -gt 0 ]]; do
		netmask="${netmask}.255"
		(( octets-- ))
		(( done++ ))
	done

	if [[ ${done} -lt 4 ]]; then
		for (( i=0; i<${frac}; i++ )); do
			(( sum+=cur ))
			(( cur/=2 ))
		done
		netmask="${netmask}.${sum}"
		(( done++ ))

		while [[ ${done} -lt 4 ]]; do
			netmask="${netmask}.0"
			(( done++ ))
		done
	fi

	echo "${netmask:1}"
}

# char* ip_network(char *ip, char *netmask)
#
# Returns the network of the ip address
# ip can be 192.168.0.51/24
# or
# ip can be 192.168.0.51 and netmask is 255.255.255.0
ip_network() {
	local ip="$1" mask="$2" i network x

	# We only work for IPv4 addresses
	[[ ${ip} != *.*.*.* ]] && return
	
	# If we didn't get parameter 2 then assume we have a CIDR
	if [[ -z ${mask} ]]; then
		mask="${ip##*/}"
		[[ -z ${mask} || ${mask} == ${ip} ]] && return 1
		mask=$( cidr2netmask "${mask}" )
		ip="${ip%%/*}"
	fi

	ip=( ${ip//./ } )
	mask=( ${mask//./ } )

	for (( i=0; i<4; i++ )); do
		(( x=ip[i] & mask[i] ))
		network="${network}${x}"
		[[ ${i} -lt 3 ]] && network="${network}."
	done

	echo "${network}"
}

# bool clean_pidfile(char *file)
#
# Removes the given pidfile if the process is not running
# Returns 1 if the process is still running otherwise 0
clean_pidfile() {
	local pidfile="$1"

	[[ ! -f ${pidfile} ]] && return 0
	local pid=$( < "${pidfile}" )

	if [[ -n ${pid} ]]; then
		local cmd="${pidfile##*/}"
		cmd="${cmd%%-*}"
		ps -p "${pid}" 2>/dev/null | grep -q "${cmd}" && return 1
	fi

	rm -f "${pidfile}"
	return 0
}

# bool process_finished(int pid, char* cmd)
#
# We wait for 10 seconds until the command ${cmd}
# stops running on the process ${pid}
process_finished() {
	local i pid="$1" cmd="$2" secs="${3:-9}"

	for (( i=0; i<secs; i++ )); do
		ps -p "${pid}" 2>/dev/null | grep -q "${cmd}" || return 0
		sleep 1
	done

	return 1
}

# bool is_function(char* name)
#
# Returns 0 if the given name is a shell function, otherwise 1
is_function() {
	[[ -z $1 ]] && return 1
	[[ $(type -t "$1") == "function" ]]
}

# void function_wrap(char* source, char* target)
#
# wraps function calls - for example function_wrap(this, that)
# maps function names this_* to that_*
function_wrap() {
	local i

	is_function "${2}_depend" && return

	for i in $( typeset -f | grep -o '^'"${1}"'_[^ ]*' ); do
		eval "${2}${i#${1}}() { ${i} \"\$@\"; }"
	done
}

# char[] * expand_parameters(char *cmd)
#
# Returns an array after expanding parameters. For example
# "192.168.{1..3}.{1..3}/24 brd +"
# will return
# "192.168.1.1/24 brd +"
# "192.168.1.2/24 brd +"
# "192.168.1.3/24 brd +"
# "192.168.2.1/24 brd +"
# "192.168.2.2/24 brd +"
# "192.168.2.3/24 brd +"
# "192.168.3.1/24 brd +"
# "192.168.3.2/24 brd +"
# "192.168.3.3/24 brd +"
expand_parameters() {
	local x="$( eval echo ${@// /_} )"
	local -a a=( ${x} )

	a=( "${a[@]/#/\"}" )
	a=( "${a[@]/%/\"}" )
	echo "${a[*]//_/ }"
}

# void configure_variables(char *interface, char *option1, [char *option2])
#
# Maps configuration options from <variable>_<option> to <variable>_<iface>
# option2 takes precedence over option1
configure_variables() {
	local iface="$1" option1="$2" option2="$3"

	local mod func x i
	local -a ivars ovars1 ovars2
	local ifvar=$( bash_variable "${iface}" )

	for mod in ${MODULES[@]}; do
		is_function ${mod}_variables || continue
		for v in $(${mod}_variables) ; do
			x=""
			[[ -n ${option2} ]] && x="${v}_${option2}[@]"
			[[ -z ${!x} ]] && x="${v}_${option1}[@]"
			[[ -n ${!x} ]] && eval "${v}_${ifvar}=( \"\${!x}\" )"
		done
	done

	return 0
}

# Provide a wrapper for hostname if it's not available
if [[ -z $(type -p hostname) ]]; then
	hostname() {
		# Linux and *BSD seem to differ
		local kernel="kern" ctl="hostname"
		[[ $(uname) == "Linux" ]] && kernel="kernel"
		
		if [[ $1 == "-y" || $1 == "--yp" || $1 == "nis" ]]; then
			ctl="domainname"
			shift
		fi
		
		if [[ -n $1 ]]; then
			sysctl -q -w "${kernel}.${ctl}=$1"
		else
			sysctl -n "${kernel}.${ctl}"
		fi
	}
fi

# vim:ts=4