4 ################################################################################
6 # Michael Smith. All rights reserved.
8 # Redistribution and use in source and binary forms, with or without
9 # modification, are permitted provided that the following conditions
11 # 1. Redistributions of source code must retain the above copyright
12 # notice, this list of conditions and the following disclaimer.
13 # 2. Redistributions in binary form must reproduce the above copyright
14 # notice, this list of conditions and the following disclaimer in the
15 # documentation and/or other materials provided with the distribution.
16 # 3. Neither the name of the author nor the names of any co-contributors
17 # may be used to endorse or promote products derived from this software
18 # without specific prior written permission.
20 # THIS SOFTWARE IS PROVIDED BY Michael Smith AND CONTRIBUTORS ``AS IS'' AND
21 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 # ARE DISCLAIMED. IN NO EVENT SHALL Michael Smith OR CONTRIBUTORS BE LIABLE
24 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 ################################################################################
33 # LibraryReport; produce a list of shared libraries on the system, and a list of
34 # all executables that use them.
36 ################################################################################
38 # Stage 1 looks for shared libraries; the output of 'ldconfig -r' is examined
39 # for hints as to where to look for libraries (but not trusted as a complete
42 # These libraries each get an entry in the global 'Libs()' array.
44 # Stage 2 walks the entire system directory heirachy looking for executable
45 # files, applies 'ldd' to them and attempts to determine which libraries are
46 # used. The path of the executable is then added to the 'Libs()' array
47 # for each library used.
49 # Stage 3 reports on the day's findings.
51 ################################################################################
55 #########################################################################################
58 # Ask ldconfig where it thinks libraries are to be found. Go look for them, and
59 # add an element to 'Libs' for everything that looks like a library.
63 global Libs stats verbose;
65 # Older ldconfigs return a junk value when asked for a report
66 if {[catch {set liblist [exec ldconfig -r]} err]} { # get ldconfig output
67 puts stderr "ldconfig returned nonzero, persevering.";
68 set liblist $err; # there's junk in this
71 # remove hintsfile name, convert to list
72 set liblist [lrange [split $liblist "\n"] 1 end];
74 set libdirs ""; # no directories yet
75 foreach line $liblist {
76 # parse ldconfig output
77 if {[scan $line "%s => %s" junk libname] == 2} {
79 set libdir [file dirname $libname];
80 # have we got this one already?
81 if {[lsearch -exact $libdirs $libdir] == -1} {
82 lappend libdirs $libdir;
85 puts stderr "Unparseable ldconfig output line :";
90 # libdirs is now a list of directories that we might find libraries in
91 foreach dir $libdirs {
92 # get the names of anything that looks like a library
93 set libnames [glob -nocomplain "$dir/lib*.so.*"]
94 foreach lib $libnames {
95 set type [file type $lib]; # what is it?
97 file { # looks like a library
98 # may have already been referenced by a symlink
99 if {![info exists Libs($lib)]} {
100 set Libs($lib) ""; # add it to our list
101 if {$verbose} {puts "+ $lib";}
104 link { # symlink; probably to another library
105 # If the readlink fails, the symlink is stale
106 if {[catch {set ldest [file readlink $lib]}]} {
107 puts stderr "Symbolic link points to nothing : $lib";
109 # may have already been referenced by another symlink
110 if {![info exists Libs($lib)]} {
111 set Libs($lib) ""; # add it to our list
112 if {$verbose} {puts "+ $lib";}
114 # list the symlink as a consumer of this library
115 lappend Libs($ldest) "($lib)";
116 if {$verbose} {puts "-> $ldest";}
122 set stats(libs) [llength [array names Libs]];
125 ################################################################################
128 # Look in the directory (dir) for executables. If we find any, call
129 # examineExecutable to see if it uses any shared libraries. Call ourselves
130 # on any directories we find.
132 # Note that the use of "*" as a glob pattern means we miss directories and
133 # executables starting with '.'. This is a Feature.
135 proc findLibUsers {dir} {
137 global stats verbose;
140 set ents [glob -nocomplain "$dir/*"];
143 set msg "permission denied";
145 puts stderr "Can't search under '$dir' : $msg";
149 if {$verbose} {puts "===>> $dir";}
155 if {[file executable $f]} {
157 if {[file isfile $f]} {
159 examineExecutable $f;
165 # maybe a directory with more files?
166 # don't use 'file isdirectory' because that follows symlinks
167 if {[catch {set type [file type $f]}]} {
168 continue ; # may not be able to stat
170 if {$type == "directory"} {
176 ################################################################################
179 # Look at (fname) and see if ldd thinks it references any shared libraries.
180 # If it does, update Libs with the information.
182 proc examineExecutable {fname} {
184 global Libs stats verbose;
187 if {[catch {set result [exec ldd $fname]} msg]} {
188 return ; # not dynamic
191 if {$verbose} {puts -nonewline "$fname : ";}
194 # For a non-shared executable, we get a single-line error message.
195 # For a shared executable, we get a heading line, so in either case
196 # we can discard the first line and any subsequent lines are libraries
198 set llist [lrange [split $result "\n"] 1 end];
201 foreach line $llist {
202 if {[scan $line "%s => %s %s" junk1 lib junk2] == 3} {
203 if {$lib == "not"} { # "not found" error
204 set mlname [string range $junk1 2 end];
205 puts stderr "$fname : library '$mlname' not known.";
207 lappend Libs($lib) $fname;
211 puts stderr "Unparseable ldd output line :";
215 if {$verbose} {puts "$uses";}
218 ################################################################################
221 # Emit a listing of libraries and the executables that use them.
223 proc emitLibDetails {} {
227 # divide into used/unused
230 foreach lib [array names Libs] {
231 if {$Libs($lib) == ""} {
239 puts "== Current Shared Libraries ==================================================";
240 foreach lib [lsort $used] {
241 # sort executable names
242 set users [lsort $Libs($lib)];
243 puts [format "%-30s %s" $lib $users];
246 puts "== Stale Shared Libraries ====================================================";
247 foreach lib [lsort $unused] {
248 # sort executable names
249 set users [lsort $Libs($lib)];
250 puts [format "%-30s %s" $lib $users];
254 ################################################################################
255 # Run the whole shebang
259 global stats verbose argv;
268 puts stderr "Unknown option '$arg'.";
283 puts [format "Searched %d directories, %d executables (%d dynamic) for %d libraries." \
284 $stats(dirs) $stats(files) $stats(execs) $stats(libs)];
287 ################################################################################