summaryrefslogtreecommitdiffstats
path: root/stap-client
blob: 68584e1b59a966ac4673c94a9ade5552d2b0e508 (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
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
#!/bin/bash

# Compile server client for systemtap
#
# Copyright (C) 2008, 2009 Red Hat Inc.
#
# This file is part of systemtap, and is free software.  You can
# redistribute it and/or modify it under the terms of the GNU General
# Public License (GPL); either version 2, or (at your option) any
# later version.

# This script examines the systemtap command line and packages the files and
# information needed to execute the command. This is then sent to a trusted
# systemtap server which will process the request and return the resulting
# kernel module (if requested) and any other information generated by the
# request. If a kernel module is generated, this script will load the module
# and execute it using 'staprun', if requested.

# Catch ctrl-c and other termination signals
trap 'terminate' SIGTERM
trap 'interrupt' SIGINT
trap 'ignore_signal' SIGHUP SIGPIPE

# Initialize the environment
. `dirname $0`/stap-env

#-----------------------------------------------------------------------------
# Helper functions.
#-----------------------------------------------------------------------------
# function: initialization
function initialization {
    our_host_name=`expr "$HOSTNAME" : "\\\([a-zA-Z0-9-]*\\\).*"`
    our_domain_name=`expr "$HOSTNAME" : "$our_host_name\\\(.*\\\)"`

    rc=0
    wd=`pwd`
    umask 0

    # Default location for server certificates if we're not root
    # Must be owned by us.
    local uid
    if test $EUID != 0; then
	if test -e $stap_user_ssl_db/client; then
	    if check_db $stap_user_ssl_db/client $EUID $USER; then
		local_ssl_dbs=$stap_user_ssl_db/client
	    fi
	fi
    fi
    # Additional location for all users. Must be owned by root.
    if test -e $stap_root_ssl_db/client; then
	if check_db $stap_root_ssl_db/client 0 root; then
	    public_ssl_dbs=$stap_root_ssl_db/client
	fi
    fi

    # Default options settings
    p_phase=5
    v_level=0
    keep_temps=0
    b_specified=0
    m_name=
    module_name=stap_$$
    uname_r="`uname -r`"
    arch=`stap_get_arch`

    # Default variable settings
    find_all=

    # Create a temporary directory to package things in
    # Do this before parsing the command line so that there is a place
    # to put -I and -R directories.
    tmpdir_client=`mktemp -dt $stap_tmpdir_prefix_client.XXXXXX` || \
	fatal "Cannot create temporary directory " $tmpdir_client
    tmpdir_env=`dirname $tmpdir_client`
}

# function: parse_options [ STAP-OPTIONS ]
#
# Examine the command line. We need not do much checking, but we do need to
# parse all options in order to discover the ones we're interested in.
# The server will take care of most situations and return the appropriate
# output.
#
function parse_options {
    cmdline=
    cmdline1=
    cmdline2=

    while test $# != 0
    do
	advance_p=0
	dash_seen=0

        # Start of a new token.
	first_token=$1
	until test $advance_p != 0
	do
            # Identify the next option
	    first_char=`expr "$first_token" : '\(.\).*'`
	    second_char=
	    if test $dash_seen = 0; then
		if test "$first_char" = "-"; then
		    if test "$first_token" != "-"; then
	                # It's not a lone dash, so it's an option.
			# Is it a long option (i.e. --option)?
			second_char=`expr "$first_token" : '.\(.\).*'`
			if test "X$second_char" = "X-"; then
			    long_option=`expr "$first_token" : '--\(.*\)=.*'`
			    test "X$long_option" != "X" || long_option=`expr "$first_token" : '--\(.*\)'`
			    case $long_option in
				ssl)
				    process_ssl $first_token
				    ;;
				server)
				    process_server $first_token
				    ;;
				*)
		                    # An unknown or unimportant option.
				    # Ignore it, but pass it on to the server.
				    cmdline2="$cmdline2 $first_token"
				    ;;
			    esac
			    advance_p=$(($advance_p + 1))
			    break
			fi
	                # It's not a lone dash, or a long option, so it's a short option string.
			# Remove the dash.
			first_token=`expr "$first_token" : '-\(.*\)'`
			dash_seen=1
			first_char=`expr "$first_token" : '\(.\).*'`
		    fi
		fi
		if test $dash_seen = 0; then
	            # The dash has not been seen. This is either the script file
	            # name or an argument to be passed to the probe module.
	            # If this is the first time, and -e has not been specified,
	            # then it could be the name of the script file.
		    if test "X$e_script" = "X" -a "X$script_file" = "X"; then
			script_file="$first_token"
			cmdline1="$cmdline2"
			cmdline2=
		    elif test "$first_char" != "'"; then
			cmdline2="$cmdline2 '$first_token'"
		    else
			cmdline2="$cmdline2 $first_token"
		    fi
		    advance_p=$(($advance_p + 1))
		    break
		fi
	    fi

            # We are at the start of an option. Look at the first character.
	    case $first_char in
		a)
		    get_arg $first_token $2
		    process_a $stap_arg
		    ;;	
		b)
		    b_specified=1
		    ;;
		B)
		    get_arg $first_token $2
		    cmdline2="${cmdline2} -$first_char '$stap_arg'"
		    ;;	
		c)
		    get_arg $first_token "$2"
		    process_c "$stap_arg"
		    ;;
		D)
		    get_arg $first_token $2
		    cmdline2="${cmdline2} -$first_char '$stap_arg'"
		    ;;
		e)
		    get_arg $first_token "$2"
		    process_e "$stap_arg"
		    ;;
		I)
		    get_arg $first_token $2
		    process_I $stap_arg
		    ;;	
		k)
		    keep_temps=1
		    ;;
		l)
		    get_arg $first_token $2
		    cmdline2="${cmdline2} -$first_char '$stap_arg'"
		    p_phase=2
		    ;;
		L)
		    get_arg $first_token $2
		    cmdline2="${cmdline2} -$first_char '$stap_arg'"
		    p_phase=2
		    ;;
		m)
		    get_arg $first_token $2
		    process_m $stap_arg
		    ;;
		o)
		    get_arg $first_token $2
		    process_o $stap_arg
		    ;;
		p)
		    get_arg $first_token $2
		    process_p $stap_arg
		    ;;
		r)
		    get_arg $first_token $2
		    process_r $stap_arg
		    ;;	
		R)
		    get_arg $first_token $2
		    process_R $stap_arg
		    ;;	
		s)
		    get_arg $first_token $2
		    cmdline2="${cmdline2} -$first_char '$stap_arg'"
		    ;;	
		S)
		    get_arg $first_token $2
		    cmdline2="${cmdline2} -$first_char '$stap_arg'"
		    ;;	
		v)
		    v_level=$(($v_level + 1))
		    ;;
		x)
		    get_arg $first_token $2
		    cmdline2="${cmdline2} -$first_char '$stap_arg'"
		    ;;
		*)
		    # An unknown or unimportant flag. Ignore it, but pass it on to the server.
		    ;;
	    esac

	    if test $advance_p = 0; then
	        # Just another flag character. Consume it.
		cmdline2="$cmdline2 -$first_char"
		first_token=`expr "$first_token" : '.\(.*\)'`
		if test "X$first_token" = "X"; then
		    advance_p=$(($advance_p + 1))
		fi
	    fi
	done

        # Consume the arguments we just processed.
	while test $advance_p != 0
	do
	    shift
	    advance_p=$(($advance_p - 1))
	done
    done

    # If the script file was given and it's not '-', then replace it with its
    # client-temp-name in the command string.
    if test "X$script_file" != "X"; then
	local local_name
	if test "$script_file" != "-"; then
	    local_name=`generate_client_temp_name "$script_file"`
	else
	    local_name="$script_file"
	fi
	cmdline="$cmdline1 'script/$local_name' $cmdline2"
    else
	cmdline="$cmdline2"
    fi

    # Processing based on final options settings
    # Complete the list of local certificate databases
    local_ssl_dbs="$additional_local_ssl_dbs $local_ssl_dbs"

    # We must have at least one usable certificate database.
    test "X$local_ssl_dbs" != "X " -o "X$public_ssl_dbs" != "X" || \
	fatal "No usable certificate databases found"

    # We can use any server if the phase is less than 4
    # But don't for now....
    #if test $p_phase -lt 4; then
    #	find_all="--all"
    #fi
}

# function: get_arg FIRSTWORD SECONDWORD
#
# Collect an argument to the given option
function get_arg {
    # Remove first character.
    local opt=`expr "$1" : '\(.\).*'`
    local first=`expr "$1" : '.\(.*\)'`

    # Advance to the next token, if the first one is exhausted.
    if test "X$first" = "X"; then
	shift
	advance_p=$(($advance_p + 1))
	first=$1
    fi

    test "X$first" != "X" || \
	fatal "Missing argument to -$opt"

    stap_arg="$first"
    advance_p=$(($advance_p + 1))
}

# function: process_ssl ARGUMENT
#
# Process the --ssl option.
function process_ssl {
    local db=`expr "$1" : '--ssl=\(.*\)'`

    test "X$db" != "X" || \
	fatal "Missing argument to --ssl"

    check_db $db || return

    additional_local_ssl_dbs="$additional_local_ssl_dbs $db"
}

# function: process_server ARGUMENT
#
# Process the --server option.
function process_server {
    local spec=`expr "$1" : '--server=\(.*\)'`

    test "X$spec" != "X" || \
	fatal "Missing argument to --server"

    specified_servers="$specified_servers $spec"
}

# function: process_c ARGUMENT
#
# Process the -c flag.
function process_c {
    c_cmd="$1"
    cmdline2="${cmdline2} -c '$1'"
}

# function: process_e ARGUMENT
#
# Process the -e flag.
function process_e {
    # Only the first -e option is recognized and it overrides any script file name
    # which may have already been identified.
    if test "X$e_script" = "X"; then
	e_script="$1"
	if test "X$script_file" != "X"; then
	    cmdline2="$cmdline1 '$script_file' $cmdline2"
	    cmdline1=
	    script_file=
	fi
    fi
    cmdline2="${cmdline2} -e '$1'"
}

# function: process_I ARGUMENT
#
# Process the -I flag.
function process_I {
    local local_name=`include_file_or_directory tapsets $1`
    test "X$local_name" != "X" || return
    cmdline2="${cmdline2} -I 'tapsets/$local_name'"
}

# function: process_m ARGUMENT
#
# Process the -m flag.
function process_m {
    module_name="$1"
    m_name="$1"
    cmdline2="${cmdline2} -m '$1'"
}

# function: process_o ARGUMENT
#
# Process the -o flag.
function process_o {
    stdout_redirection="$1"
    cmdline2="${cmdline2} -o '$1'"
}

# function: process_p ARGUMENT
#
# Process the -p flag.
function process_p {
    p_phase=$1
    cmdline2="${cmdline2} -p '$1'"
}

# function: process_r ARGUMENT
#
# Process the -r flag.
function process_r {
    local first_char=`expr "$1" : '\(.\).*'`

    if test "$first_char" = "/"; then # fully specified path
        kernel_build_tree=$1
        version_file_name="$kernel_build_tree/include/config/kernel.release"
        # The file include/config/kernel.release within the
        # build tree is used to pull out the version information
	release=`cat $version_file_name 2>/dev/null`
	if test "X$release" = "X"; then
	    fatal "Missing $version_file_name"
	    return
	fi
    else
	# kernel release specified directly
	release=$1
    fi

    if test "X$release" != "X$uname_r"; then
	uname_r=$release
	find_all="--all"
    fi
}

# function: process_a ARGUMENT
#
# Process the -a flag.
function process_a {
    if test "X$1" != "X$arch"; then
	arch=$1
	find_all="--all"
    fi
}

# function: process_R ARGUMENT
#
# Process the -R flag.
function process_R {
    local local_name=`include_file_or_directory runtime $1`
    test "X$local_name" != "X" || return
    cmdline2="${cmdline2} -R 'runtime/$local_name'"
}

# function: include_file_or_directory PREFIX NAME
#
# Include the given file or directory in the client's temporary
# tree to be sent to the server.
function include_file_or_directory {
    # Add a symbolic link of the named file or directory to our temporary directory
    local local_name=`generate_client_temp_name "$2"`
    local local_dirname=`dirname "$local_name"`
    mkdir -p "$tmpdir_client/$1/$local_dirname" || \
	fatal "Could not create $tmpdir_client/$1/$local_dirname"
    ln -s "/$local_name" "$tmpdir_client/$1/$local_name" || \
	fatal "Could not link $tmpdir_client/$1/$local_name to /$local_name"
    echo "$local_name"
}

# function: generate_client_temp_name NAME
#
# Generate the name to be used for the given file/directory relative to the
# client's temporary directory.
function generate_client_temp_name {
    # Transform the name into a fully qualified path name
    local full_name=`echo "$1" | sed "s,^\\\([^/]\\\),$wd/\\\\1,"`

    # The same name without the initial / or trailing /
    local local_name=`echo "$full_name" | sed 's,^/\(.*\),\1,'`
    local_name=`echo "$local_name" | sed 's,\(.*\)/$,\1,'`
    echo "$local_name"
}

# function: create_request
#
# Add information to the client's temp directory representing the request
# to the server.
function create_request {
    # Work in our temporary directory
    cd $tmpdir_client

    if test "X$script_file" != "X"; then
	if test "$script_file" = "-"; then
	    mkdir -p $tmpdir_client/script || \
		fatal "Cannot create temporary directory " $tmpdir_client/script
	    cat > "$tmpdir_client/script/$script_file"
	else
	    include_file_or_directory script "$script_file" > /dev/null
	fi
    fi

    # Add the necessary info to special files in our temporary directory.
    echo "cmdline: $cmdline" > cmdline
    echo "sysinfo: `client_sysinfo`" > sysinfo
}

# function client_sysinfo
#
# Generate the client's sysinfo and echo it to stdout
function client_sysinfo {
    echo "$uname_r $arch"
}

# function: package_request
#
# Package the client's temp directory into a form suitable for sending to the
# server.
function package_request {
    # Package up the temporary directory into a zip file
    cd $tmpdir_env

    local tmpdir_client_base=`basename $tmpdir_client`
    zip_client=$tmpdir_env/`mktemp $tmpdir_client_base.zip.XXXXXX` || \
	fatal "Cannot create temporary file " $zip_client

    (rm $zip_client && zip -r $zip_client $tmpdir_client_base > /dev/null) || \
	fatal "zip of request tree, $tmpdir_client, failed"
}

# function: unpack_response
#
# Unpack the zip file received from the server and make the contents available
# for printing the results and/or running 'staprun'.
function unpack_response {
    tmpdir_server=`mktemp -dt $stap_tmpdir_prefix_client.server.XXXXXX` || \
	fatal "Cannot create temporary file " $tmpdir_server

    # Unpack the server output directory
    unzip -d $tmpdir_server $zip_server > /dev/null || \
	fatal "Cannot unpack server response, $zip_server"

    # Check the contents of the expanded directory. It should contain a
    # single directory whose name matches $stap_tmpdir_prefix_server.??????
    local num_files=`ls $tmpdir_server | wc -l`
    test $num_files = 1 || \
	fatal "Wrong number of files in server's temp directory"
    test -d $tmpdir_server/$stap_tmpdir_prefix_server.?????? || \
	fatal "`ls $tmpdir_server` does not match the expected name or is not a directory"
    # Move the contents of the directory down one level.
    mv $tmpdir_server/$stap_tmpdir_prefix_server.??????/* $tmpdir_server
    rm -fr $tmpdir_server/$stap_tmpdir_prefix_server.??????

    # Check the contents of the directory. It should contain:
    # 1) a file called stdout
    # 2) a file called stderr
    # 3) a file called rc
    # 4) optionally a directory named to match stap??????
    num_files=`ls $tmpdir_server | wc -l`
    test $num_files = 4 -o $num_files = 3 || \
	fatal "Wrong number of files in server's temp directory"
    test -f $tmpdir_server/stdout || \
	fatal "`pwd`/$tmpdir_server/stdout does not exist or is not a regular file"
    test -f $tmpdir_server/stderr || \
	fatal "`pwd`/$tmpdir_server/stderr does not exist or is not a regular file"
    test -f $tmpdir_server/rc || \
	fatal "`pwd`/$tmpdir_server/rc does not exist or is not a regular file"

    # See if there is a systemtap temp directory
    tmpdir_stap=`cd $tmpdir_server && ls | grep stap......\$ 2>/dev/null`
    if test "X$tmpdir_stap" != "X"; then
	test -d $tmpdir_server/$tmpdir_stap || \
	    fatal "$tmpdir_server/$tmpdir_stap is not a directory"

        # Move the systemtap temp directory to a local temp location, if -k
        # was specified.
	if test $keep_temps = 1; then
	    local local_tmpdir_stap=`mktemp -dt stapXXXXXX` || \
		fatal "Cannot create temporary directory " $local_tmpdir_stap
	    mv $tmpdir_server/$tmpdir_stap/* $local_tmpdir_stap 2>/dev/null
	    rm -fr $tmpdir_server/$tmpdir_stap

	    # Correct the name of the temp directory in the server's stderr output
	    sed -i "s,^Keeping temporary directory.*,Keeping temporary directory \"$local_tmpdir_stap\"," $tmpdir_server/stderr
	    tmpdir_stap=$local_tmpdir_stap
	else
	    tmpdir_stap=$tmpdir_server/$tmpdir_stap
            # Make sure we own the systemtap temp directory if we are root.
	    test $EUID = 0 && chown $EUID:$EUID $tmpdir_stap
	fi
    fi
}

# function: find_and_connect_to_server
#
# Find and establish connection with a compatible stap server.
function find_and_connect_to_server {
    local num_servers=0

    # Make a place to receive the response file.
    zip_server=`mktemp -t $stap_tmpdir_prefix_client.server.zip.XXXXXX` || \
	fatal "Cannot create temporary file " $zip_server

    # Make a place to record connection errors
    touch $tmpdir_client/connect

    # If servers were specified on the command line, then try them
    # in sequence. Don't try any other servers.
    if test "X$specified_servers" != "X"; then
	for server in $specified_servers; do
	    num_servers=$(($num_servers + 1))

	    # If the server is completely specified, (i.e. server:port),
            # then try it directly.
	    port=`expr "$server" : '.\+:\([0-9]\+\)'`
            if test "X$port" != "X"; then
		name=`expr "$server" : '\(.\+\):[0-9]\+'`

                # If we have been given an ip address, then try to resolve it to a name.
                # If we have been given a name, try to resolve the full name.
                # The full name is needed in order to validate the server's certificate.
                address=`expr "$name" : '\([0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+\)'`
		if test "X$address" = "X"; then
		    # We've been given a host name
		    full_name=`nslookup $name | awk '/^Name\:/ {print $2}'`
		    if test "X$full_name" != "X"; then
			name=$full_name
		    fi
		else
		    # We've been given an ip address.
		    name=`nslookup $address | awk '/in-addr\.arpa/ {print $4}'`
		    name=`expr "$name" : '\(.*\)\.'`
                    if test "X$name" = "X"; then
			echo "Cannot resolve ip address $address" >> $tmpdir_client/connect
			continue
		    fi
		fi

		# Now try to contact the given server.
		ssl_db=`send_receive $name $port`
		test "X$ssl_db" != "X" && return
		continue
	    fi

	    # Otherwise select the matching server from the available servers
	    # and use the port it is advertizing.
	    #
	    # Have we been given an ip address? If so, just use it.
	    address=`expr "$server" : '\([0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+\)'`
	    if test "X$address" = "X"; then
		# We have not been given an ip address. Try to resolve it as a host name.
		if test "X$server" = "Xlocalhost"; then
		    # We don't want the address of the loopback interface here. Avahi will present
		    # the actual ip address.
		    server=$our_host_name$our_domain_name
		fi
		address=`nslookup $server | awk '/^Address\:[ \t][0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$/ {print $2}'`
                if test "X$address" = "X"; then
		    echo "Cannot resolve server $server" >> $tmpdir_client/connect
		    continue
		fi
	    fi

	    if test `${stap_exec_prefix}stap-find-servers $find_all | grep $address | wc -l` = "0"; then
		warning "No server is available on $server" 2>> $tmpdir_client/connect
		continue
	    fi

            ssl_db=`${stap_exec_prefix}stap-find-servers $find_all | grep $address | choose_server`
	    test "X$ssl_db" != "X" && return
	done
    else
        # No servers specified. Find available servers and choose one of them.
	# Remember which ssl certificate database was used to authenticate the chosen
        # server.
	ssl_db=`${stap_exec_prefix}stap-find-servers $find_all | choose_server`
	test "X$ssl_db" != "X" && return

	num_servers=`${stap_exec_prefix}stap-find-servers $find_all | wc -l`
    fi

    if test $num_servers = 0; then
	fatal "Unable to find a server"
    fi

    cat $tmpdir_client/connect >&2
    fatal "Unable to connect to a server"
}

# function: choose_server
#
# Examine each line from stdin and attempt to connect to each server
# specified until successful.
# echo the name of the ssl certificate database used to successfully authenticate
# the server.
function choose_server {
    local name ip port remain

    while read name ip port remain
    do
	if test "X$name" = "X"; then
	    fatal "Server name not provided by avahi"
	fi

#	if test "X$ip" = "X"; then
#	    fatal "Server ip address not provided by avahi"
#	fi

	if test "X$port" = "X"; then
	    fatal "Server port not provided by avahi"
	fi

	# Does the server build for the kernel release and architecture that we want?
	sysinfo=`expr "$remain" : "'sysinfo=\\\(.*\\\)'"`
	test "X$sysinfo" != "X$uname_r $arch" && continue

	ssl_db=`send_receive $name $port`
	test "X$ssl_db" != "X" && echo $ssl_db && return
    done
}

# function: send_receive SERVER PORT
#
# Connect to the server, send the request and receive the response
# echo the name of the ssl certificate database used to successfully authenticate
# the server.
function send_receive {
    local server=$1
    local port=$2

    # The server must match the dns name on the certificate
    # and must be 'localhost' if the server is on the local host.
    local server_host_name=`expr "$server" : "\\\([a-zA-Z0-9-]*\\\).*"`
    local server_domain_name=`expr "$server" : "$server_host_name\\\(.*\\\)"`

    if test "X$server_domain_name" = "X.local"; then
	server_domain_name=$our_domain_name
    fi
    if test "X$server_host_name$server_domain_name" = "Xlocalhost$our_domain_name"; then
	server=localhost
    elif test "X$server_host_name$server_domain_name" = "X$our_host_name$our_domain_name"; then
	server=localhost
    else
	server=$server_host_name$server_domain_name
    fi

    # Try to connect using each of the given local certificate databases in turn
    # for verification.
    for db in $local_ssl_dbs
    do
        # Send the request and receive the response using stap-client-connect
	echo "Attempting connection with $server:$port using certificate database in '$db'" >> $tmpdir_client/connect
	${stap_exec_prefix}stap-client-connect -i $zip_client -o $zip_server -d $db -p $port -h $server >> $tmpdir_client/connect 2>&1 &
	wait '%${stap_exec_prefix}stap-client-connect'
	test $? = 0 && echo $db && return
	sleep 1
    done

    # Next, try the public certificate databases.
    for db in $public_ssl_dbs
    do
        # Send the request and receive the response using stap-client-connect
	echo "Attempting connection with $server:$port using certificate database in '$db'" >> $tmpdir_client/connect
	${stap_exec_prefix}stap-client-connect -i $zip_client -o $zip_server -d $db -p $port -h $server >> $tmpdir_client/connect 2>&1 &
	wait '%${stap_exec_prefix}stap-client-connect'
	test $? = 0 && echo $db && return
	sleep 1
    done

    # Could not connect using any of the certificate databases
}

# function: process_response
#
# Write the stdout and stderr from the server to stdout and stderr respectively.
function process_response {
    # Pick up the results of running stap on the server.
    cd $tmpdir_server
    rc=`cat rc`

    if test $p_phase -ge 4; then
	if test -f $tmpdir_stap/*.ko; then
	    if test $p_phase = 4 -o "X$m_name" != "X"; then
		cp -p $tmpdir_stap/*.ko $wd/$module_name.ko
		test -f $tmpdir_stap/*.sgn && cp -p $tmpdir_stap/*.sgn $wd/$module_name.ko.sgn
	    else
		module_name=`ls $tmpdir_stap/*.ko`
		module_name=`expr "$module_name" : '\(.*\)\.ko'`
	    fi
	elif test "X$script_file" != "X" -o "X$e_script" != "X"; then
	    if test "X$rc" != "X" -a $rc = 0; then
		stream_output
		fatal "no module returned by the server"
	    fi
	fi
    fi

    # Change the name of the temp directory and module name in stdout and stderr
    sed -i "s,stap_[0-9]\+,$module_name,g" $tmpdir_server/stdout
    sed -i "s,stap_[0-9]\+,$module_name,g" $tmpdir_server/stderr
    sed -i "s,into \".*$module_name,into \"$module_name,g" $tmpdir_server/stdout
    sed -i "s,into \".*$module_name,into \"$module_name,g" $tmpdir_server/stderr

    # Output stdout and stderr as directed
    stream_output
}

# function: stream_output
#
# Output stdout and stderr as directed
function stream_output {
    cd $tmpdir_server
    cat stderr >&2
    cat stdout
}

# function: maybe_call_staprun
#
# Call staprun using the module returned from the server, if requested.
function maybe_call_staprun {
    if test $rc != 0; then
	# stap run on the server failed, so don't bother
	return
    fi

    if test $p_phase -ge 4; then
        # There should be a systemtap temporary directory.
	if test "X$tmpdir_stap" = "X"; then
	    # OK if no script specified
	    if test "X$e_script" != "X" -o "X$script_file" != "X"; then
		fatal "systemtap temporary directory is missing in server response"
	    fi
	    return
	fi

	if test $p_phase = 5; then
	    test $v_level -gt 0 && echo "Pass 5: starting run." >&2

	    # We have a module. Try to run it
	    # If a -c command was specified, pass it along.
	    if test "X$c_cmd" != "X"; then
		staprun_opts="-c '$c_cmd'"
	    fi

	    # The -v level will be one less than what was specified
	    # for us.
	    for ((vl=$((v_level - 1)); $vl > 0; --vl))
	    do
		staprun_opts="$staprun_opts -v"
	    done

	    # if -o was specified, pass it along
	    if test "X$stdout_redirection" != "X"; then
		staprun_opts="$staprun_opts -o $stdout_redirection"
	    fi

	    # Run it from our original working directory
	    cd $wd

	    # Run it in the background and wait for it. This
	    # way any signals sent to us can be caught.
	    if test $v_level -ge 2; then
		echo "running `which staprun` $staprun_opts $module_name.ko" >&2
	    fi
	    eval `staprun_PATH` "$staprun_opts" $module_name.ko
	    rc=$?

	    # Wait until the job actually disappears so that its output is complete.
	    while jobs '%?staprun' >/dev/null 2>&1
	    do
		sleep 1
	    done

	    test $v_level -gt 0 && echo "Pass 5: run completed in 0usr/0sys/0real ms." >&2
	fi
    fi
}

# function: staprun_PATH
#
# Compute a PATH suitable for running staprun.
function staprun_PATH {
    # If $SYSTEMTAP_STAPRUN is set, then use that
    if test "X$SYSTEMTAP_STAPRUN" != "X"; then
	echo $SYSTEMTAP_STAPRUN
	return
    fi

    # Otherwise, if there is an exec_prefix, then use it.
    if test "X$stap_exec_prefix" != "X"; then
	echo ${stap_exec_prefix}staprun
	return
    fi

    # Otherwise, we have been called by the dejagnu test harness as 'stap'
    # and we are the first 'stap' on the path. Since staprun may call
    # 'stap', remove the PATH component where we live from the PATH in order to
    # avoid recursion.
    local first_stap=`which stap`
    local PATH_component=`dirname $first_stap`
    echo "PATH=$PATH staprun" | sed "s,$PATH_component,,g"
}

# function: check_db DBNAME [ EUID USER ]
#
# Check the security of the given database directory.
function check_db {
    local dir=$1
    local euid=$2
    local user=$3
    local rc=0

    # Check that we have been given a directory
    if ! test -e $dir; then
	warning "Certificate database '$dir' does not exist"
	return 1
    fi
    if ! test -d $dir; then
	warning "Certificate database '$dir' is not a directory"
	return 1
    fi

    # If euid has been specified, then this directory must be owned by that
    #  user.
    if test "X$euid" != "X"; then
	local ownerid=`stat -c "%u" $dir`
	if test "X$ownerid" != "X$euid"; then
	    warning "Certificate database '$dir' must be owned by $user"
	    rc=1
	fi
    fi

    # Check that we can read the directory
    if ! test -r $dir; then
	warning "Certificate database '$dir' is not readble"
	rc=1
    fi

    # Check the access permissions of the directory
    local perm=0`stat -c "%a" $dir`
    if test $((($perm & 0400) == 0400)) = 0; then
	warning "Certificate database '$dir' should be readable by the owner"
    fi
    if test $((($perm & 0200) == 0200)) = 0; then
	warning "Certificate database '$dir' should be writeable by the owner"
    fi
    if test $((($perm & 0100) == 0100)) = 0; then
	warning "Certificate database '$dir' should be searchable by the owner"
    fi
    if test $((($perm & 0040) == 0040)) = 0; then
	warning "Certificate database '$dir' should be readable by the group"
    fi
    if test $((($perm & 0020) == 0020)) = 1; then
	warning "Certificate database '$dir' must not be writable by the group"
	rc=1
    fi
    if test $((($perm & 0010) == 0010)) = 0; then
	warning "Certificate database '$dir' should be searchable by the group"
    fi
    if test $((($perm & 0004) == 0004)) = 0; then
	warning "Certificate database '$dir' should be readable by others"
    fi
    if test $((($perm & 0002) == 0002)) = 1; then
	warning "Certificate database '$dir' must not be writable by others"
	rc=1
    fi
    if test $((($perm & 0001) == 0001)) = 0; then
	warning "Certificate database '$dir' should be searchable by others"
    fi

    # Now check the permissions of the critical files.
    check_db_file $dir/cert8.db  $euid $user || rc=1
    check_db_file $dir/key3.db   $euid $user || rc=1
    check_db_file $dir/secmod.db $euid $user || rc=1

    test $rc = 1 && warning "Unable to use certificate database '$dir' due to errors"

    return $rc
}

# function: check_db_file FILENAME [ EUID USER ]
#
# Check the security of the given database file.
function check_db_file {
    local file=$1
    local rc=0

    # Check that we have been given a file
    if ! test -e $file; then
	warning "Certificate database file '$file' does not exist"
	return 1
    fi
    if ! test -f $file; then
	warning "Certificate database file '$file' is not a regular file"
	return 1
    fi

    # If euid has been specified, then this directory must be owned by that
    #  user.
    if test "X$euid" != "X"; then
	local ownerid=`stat -c "%u" $file`
	if test "X$ownerid" != "X$euid"; then
	    warning "Certificate database file '$file' must be owned by $user"
	    rc=1
	fi
    fi

    # Check that we can read the file
    if ! test -r $file; then
	warning "Certificate database file '$file' is not readble"
	rc=1
    fi

    # Check the access permissions of the file
    local perm=0`stat -c "%a" $file`
    if test $((($perm & 0400) == 0400)) = 0; then
	warning "Certificate database file '$file' should be readable by the owner"
    fi
    if test $((($perm & 0200) == 0200)) = 0; then
	warning "Certificate database file '$file' should be writeable by the owner"
    fi
    if test $((($perm & 0100) == 0100)) = 1; then
	warning "Certificate database file '$file' must not be executable by the owner"
	rc=1
    fi
    if test $((($perm & 0040) == 0040)) = 0; then
	warning "Certificate database file '$file' should be readable by the group"
    fi
    if test $((($perm & 0020) == 0020)) = 1; then
	warning "Certificate database file '$file' must not be writable by the group"
	rc=1
    fi
    if test $((($perm & 0010) == 0010)) = 1; then
	warning "Certificate database file '$file' must not be executable by the group"
	rc=1
    fi
    if test $((($perm & 0004) == 0004)) = 0; then
	warning "Certificate database file '$file' should be readable by others"
    fi
    if test $((($perm & 0002) == 0002)) = 1; then
	warning "Certificate database file '$file' must not be writable by others"
	rc=1
    fi
    if test $((($perm & 0001) == 0001)) = 1; then
	warning "Certificate database file '$file' must not be executable by others"
	rc=1
    fi

    return $rc
}

# function: warning [ MESSAGE ]
#
# Warning error
# Prints its arguments to stderr
function warning {
    echo "$0: WARNING:" "$@" >&2
}

# function: fatal [ MESSAGE ]
#
# Fatal error
# Prints its arguments to stderr and exits
function fatal {
    echo "$0: ERROR:" "$@" >&2
    cleanup
    exit 1
}

# function cleanup
#
# Cleanup work files unless asked to keep them.
function cleanup {
    # Clean up.
    cd $tmpdir_env
    if test $keep_temps != 1; then
	rm -fr $tmpdir_client
	rm -f  $zip_client
	rm -f  $zip_server
	rm -fr $tmpdir_server
    fi
}

# function: terminate
#
# Terminate gracefully.
function terminate {
    # Clean up
    echo "$0: terminated by signal" >&2
    cleanup

    # Kill any running staprun job
    kill -s SIGTERM '%?staprun' 2>/dev/null

    # Kill any stap-client-connect job
    kill -s SIGTERM '%${stap_exec_prefix}stap-client-connect' 2>/dev/null

    exit 1
}

# function: interrupt
#
# Pass an interrupt (ctrl-C) to staprun
function interrupt {
    # Kill any stap-client-connect job
    # SIGINT won't do it.
    kill -s SIGTERM '%${stap_exec_prefix}stap-client-connect' 2>/dev/null

    # If staprun was not running, then exit.
    cleanup
    exit 1
}

# function: ignore_signal
#
# Called in order to ignore a signal
function ignore_signal {
    :
}

#-----------------------------------------------------------------------------
# Beginning of main line execution.
#-----------------------------------------------------------------------------
initialization
parse_options "$@"
create_request
package_request
find_and_connect_to_server
unpack_response
process_response
maybe_call_staprun
cleanup

exit $rc