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#!/usr/bin/env python
#
# LinkMap.py: this file is part of the elfix package
# Copyright (C) 2011 Anthony G. Basile
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import re
import portage
class LinkMap:
def __init__(self):
""" Put all the NEEDED.ELF.2 files for all installed packages
into a dictionary of the form
{ pkg : line_from_NEEDED.ELF.2, ... }
where the line has the following form:
echo "${arch:3};${obj};${soname};${rpath};${needed}" >> \
"${PORTAGE_BUILDDIR}"/build-info/NEEDED.ELF.2
See /usr/lib/portage/bin/misc-functions.sh ~line 520
"""
vardb = portage.db[portage.root]["vartree"].dbapi
self.pkgs = []
self.pkgs_needed = {}
for pkg in vardb.cpv_all():
needed = vardb.aux_get(pkg, ['NEEDED.ELF.2'])[0].strip()
if needed: # Some packages have no NEEDED.ELF.2
self.pkgs.append(pkg)
for line in re.split('\n', needed):
self.pkgs_needed.setdefault(pkg,[]).append(re.split(';', line))
def get_object_needed(self):
""" Return object_needed dictionary which has structure
{
abi1 : { full_path_to_ELF_object : [ soname1, soname2, ... ], ... },
abi2 : { full_path_to_ELF_object : [ soname1, soname2, ... ], ... },
....
}
Here the sonames were obtained from the ELF object by scanelf -nm
(like readelf -d) during emerge.
"""
object_needed = {}
for pkg in self.pkgs:
for link in self.pkgs_needed[pkg]:
abi = link[0]
elf = link[1]
sonames = re.split(',', link[4])
object_needed.setdefault(abi,{}).update({elf:sonames})
return object_needed
def get_libraries(self):
""" Return library2soname dictionary which has structure
{ full_path_to_library : (soname, abi), ... }
and its inverse which has structure
{ (soname, abi) : full_path_to_library, ... }
"""
library2soname = {}
soname2library = {}
for pkg in self.pkgs:
for link in self.pkgs_needed[pkg]:
abi = link[0]
elf = link[1]
soname = link[2]
if soname: #no soname => executable
library2soname[elf] = (soname,abi)
soname2library[(soname,abi)] = elf
return ( library2soname, soname2library )
def get_soname_needed(self, object_needed, library2soname ):
""" Return soname_needed dictionary which has structure:
{
abi1: { soname: [ soname1, soname2, ... ], .... },
abi2: { soname: [ soname1, soname2, ... ], .... },
}
Here the soname1, soname2,... were obtained from soname's corresponding
ELF object by scanelf -n during emerge.
"""
soname_needed = {}
for abi in object_needed:
for elf in object_needed[abi]:
try:
(soname, abi_check) = library2soname[elf]
assert abi == abi_check # We should get the same abi associated with the soname
soname_needed.setdefault(abi,{}).update({soname:object_needed[abi][elf]})
except KeyError:
continue # no soname, its probably an executable
return soname_needed
def expand_linkings(self, object_needed, soname2library):
""" Expands the object_needed dictionary which has structure
{
abi1 : { full_path_to_ELF_object : [ soname1, soname2, ... ], ... },
abi2 : { full_path_to_ELF_object : [ soname1, soname2, ... ], ... },
....
}
such that the soname's are traced all the way to the end of
the link chain. Here the sonames should be the same as those
obtained from the ELF object by ldd.
"""
for abi in object_needed:
for elf in object_needed[abi]:
while True:
found_new_soname = False
for so in object_needed[abi][elf]: # For all the first links ...
try:
for sn in object_needed[abi][soname2library[(so,abi)]]: # go to the next links ...
if sn in object_needed[abi][elf]: # skip if already included ...
continue
if not (sn,abi) in soname2library: # skip if vdso ...
continue
# This appends to the object_needed and soname_needed lists. No copy was
# done so its the same lists in memory for both, and its modified for both.
object_needed[abi][elf].append(sn) # otherwise collapse it back into
found_new_soname = True # first links of the chain.
except KeyError: # Not all nodes in the chain have a next node
continue
if not found_new_soname: # We're done, that last iteration found
break # no new nodes
def get_object_reverse_linkings(self, object_linkings):
""" Return object_reverse_linkings dictionary which has structure
{
abi1 : { soname : [ path_to_elf1, path_to_elf2, ... ], ... },
abi2 : { soname : [ path_to_elf3, path_to_elf4, ... ], ... },
....
}
"""
object_reverse_linkings = {}
for abi in object_linkings:
for elf in object_linkings[abi]:
for soname in object_linkings[abi][elf]:
object_reverse_linkings.setdefault(abi,{}).setdefault(soname,[]).append(elf)
return object_reverse_linkings
def get_maps(self):
""" Generate the full forward and reverse links using the above functions """
# After get_object_needed() and get_soname_needed(), both object_linkings and
# soname_linkings are only one step into the entire link chain.
object_linkings = self.get_object_needed()
( library2soname, soname2library ) = self.get_libraries()
soname_linkings = self.get_soname_needed( object_linkings, library2soname )
# After the appending in expand_linkings(), forward_linkings and soname_linkings
# have been extended through the entire chain of linking. expand_linkings() is
# a "side-effect" function, so we note it here.
self.expand_linkings( soname_linkings, soname2library )
object_reverse_linkings = self.get_object_reverse_linkings( object_linkings )
return ( object_linkings, object_reverse_linkings, library2soname, soname2library )
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