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#!/usr/bin/env python
import sys, math
# must match <linux/nl80211.h> enum nl80211_reg_rule_flags
flag_definitions = {
'NO-OFDM': 1<<0,
'NO-CCK': 1<<1,
'NO-INDOOR': 1<<2,
'NO-OUTDOOR': 1<<3,
'DFS': 1<<4,
'PTP-ONLY': 1<<5,
'PTMP-ONLY': 1<<6,
'NO-IR': 1<<7 | 1<<8,
# hole at bit 9. FIXME: Where is NO-HT40 defined?
'NO-HT40': 1<<10,
'AUTO-BW': 1<<11,
}
dfs_regions = {
'DFS-FCC': 1,
'DFS-ETSI': 2,
'DFS-JP': 3,
}
class FreqBand(object):
def __init__(self, start, end, bw, comments=None):
self.start = start
self.end = end
self.maxbw = bw
self.comments = comments or []
def __cmp__(self, other):
s = self
o = other
if not isinstance(o, FreqBand):
return False
return cmp((s.start, s.end, s.maxbw), (o.start, o.end, o.maxbw))
def __hash__(self):
s = self
return hash((s.start, s.end, s.maxbw))
def __str__(self):
return '<FreqBand %.3f - %.3f @ %.3f>' % (
self.start, self.end, self.maxbw)
class PowerRestriction(object):
def __init__(self, max_ant_gain, max_eirp, comments = None):
self.max_ant_gain = max_ant_gain
self.max_eirp = max_eirp
self.comments = comments or []
def __cmp__(self, other):
s = self
o = other
if not isinstance(o, PowerRestriction):
return False
return cmp((s.max_ant_gain, s.max_eirp),
(o.max_ant_gain, o.max_eirp))
def __str__(self):
return '<PowerRestriction ...>'
def __hash__(self):
s = self
return hash((s.max_ant_gain, s.max_eirp))
class DFSRegionError(Exception):
def __init__(self, dfs_region):
self.dfs_region = dfs_region
class FlagError(Exception):
def __init__(self, flag):
self.flag = flag
class Permission(object):
def __init__(self, freqband, power, flags):
assert isinstance(freqband, FreqBand)
assert isinstance(power, PowerRestriction)
self.freqband = freqband
self.power = power
self.flags = 0
for flag in flags:
if not flag in flag_definitions:
raise FlagError(flag)
self.flags |= flag_definitions[flag]
self.textflags = flags
def _as_tuple(self):
return (self.freqband, self.power, self.flags)
def __cmp__(self, other):
if not isinstance(other, Permission):
return False
return cmp(self._as_tuple(), other._as_tuple())
def __hash__(self):
return hash(self._as_tuple())
class Country(object):
def __init__(self, dfs_region, permissions=None, comments=None):
self._permissions = permissions or []
self.comments = comments or []
self.dfs_region = 0
if dfs_region:
if not dfs_region in dfs_regions:
raise DFSRegionError(dfs_region)
self.dfs_region = dfs_regions[dfs_region]
def add(self, perm):
assert isinstance(perm, Permission)
self._permissions.append(perm)
self._permissions.sort()
def __contains__(self, perm):
assert isinstance(perm, Permission)
return perm in self._permissions
def __str__(self):
r = ['(%s, %s)' % (str(b), str(p)) for b, p in self._permissions]
return '<Country (%s)>' % (', '.join(r))
def _get_permissions_tuple(self):
return tuple(self._permissions)
permissions = property(_get_permissions_tuple)
class SyntaxError(Exception):
pass
class DBParser(object):
def __init__(self, warn=None):
self._warn_callout = warn or sys.stderr.write
def _syntax_error(self, txt=None):
txt = txt and ' (%s)' % txt or ''
raise SyntaxError("Syntax error in line %d%s" % (self._lineno, txt))
def _warn(self, txt):
self._warn_callout("Warning (line %d): %s\n" % (self._lineno, txt))
def _parse_band_def(self, bname, banddef, dupwarn=True):
try:
freqs, bw = banddef.split('@')
bw = float(bw)
except ValueError:
bw = 20.0
try:
start, end = freqs.split('-')
start = float(start)
end = float(end)
# The kernel will reject these, so might as well reject this
# upon building it.
if start <= 0:
self._syntax_error("Invalid start freq (%d)" % start)
if end <= 0:
self._syntax_error("Invalid end freq (%d)" % end)
if start > end:
self._syntax_error("Inverted freq range (%d - %d)" % (start, end))
if start == end:
self._syntax_error("Start and end freqs are equal (%d)" % start)
except ValueError:
self._syntax_error("band must have frequency range")
b = FreqBand(start, end, bw, comments=self._comments)
self._comments = []
self._banddup[bname] = bname
if b in self._bandrev:
if dupwarn:
self._warn('Duplicate band definition ("%s" and "%s")' % (
bname, self._bandrev[b]))
self._banddup[bname] = self._bandrev[b]
self._bands[bname] = b
self._bandrev[b] = bname
self._bandline[bname] = self._lineno
def _parse_band(self, line):
try:
bname, line = line.split(':', 1)
if not bname:
self._syntax_error("'band' keyword must be followed by name")
except ValueError:
self._syntax_error("band name must be followed by colon")
if bname in flag_definitions:
self._syntax_error("Invalid band name")
self._parse_band_def(bname, line)
def _parse_power(self, line):
try:
pname, line = line.split(':', 1)
if not pname:
self._syntax_error("'power' keyword must be followed by name")
except ValueError:
self._syntax_error("power name must be followed by colon")
if pname in flag_definitions:
self._syntax_error("Invalid power name")
self._parse_power_def(pname, line)
def _parse_power_def(self, pname, line, dupwarn=True):
try:
max_eirp = line
if max_eirp == 'N/A':
max_eirp = '0'
max_ant_gain = float(0)
def conv_pwr(pwr):
if pwr.endswith('mW'):
pwr = float(pwr[:-2])
return 10.0 * math.log10(pwr)
else:
return float(pwr)
max_eirp = conv_pwr(max_eirp)
except ValueError:
self._syntax_error("invalid power data")
p = PowerRestriction(max_ant_gain, max_eirp,
comments=self._comments)
self._comments = []
self._powerdup[pname] = pname
if p in self._powerrev:
if dupwarn:
self._warn('Duplicate power definition ("%s" and "%s")' % (
pname, self._powerrev[p]))
self._powerdup[pname] = self._powerrev[p]
self._power[pname] = p
self._powerrev[p] = pname
self._powerline[pname] = self._lineno
def _parse_country(self, line):
try:
cname, cvals= line.split(':', 1)
dfs_region = cvals.strip()
if not cname:
self._syntax_error("'country' keyword must be followed by name")
except ValueError:
self._syntax_error("country name must be followed by colon")
cnames = cname.split(',')
self._current_countries = {}
for cname in cnames:
if len(cname) != 2:
self._warn("country '%s' not alpha2" % cname)
if not cname in self._countries:
self._countries[cname] = Country(dfs_region, comments=self._comments)
self._current_countries[cname] = self._countries[cname]
self._comments = []
def _parse_country_item(self, line):
if line[0] == '(':
try:
band, line = line[1:].split('),', 1)
bname = 'UNNAMED %d' % self._lineno
self._parse_band_def(bname, band, dupwarn=False)
except:
self._syntax_error("Badly parenthesised band definition")
else:
try:
bname, line = line.split(',', 1)
if not bname:
self._syntax_error("country definition must have band")
if not line:
self._syntax_error("country definition must have power")
except ValueError:
self._syntax_error("country definition must have band and power")
if line[0] == '(':
items = line.split('),', 1)
if len(items) == 1:
pname = items[0]
line = ''
if not pname[-1] == ')':
self._syntax_error("Badly parenthesised power definition")
pname = pname[:-1]
flags = []
else:
pname = items[0]
flags = items[1].split(',')
power = pname[1:]
pname = 'UNNAMED %d' % self._lineno
self._parse_power_def(pname, power, dupwarn=False)
else:
line = line.split(',')
pname = line[0]
flags = line[1:]
if not bname in self._bands:
self._syntax_error("band does not exist")
if not pname in self._power:
self._syntax_error("power does not exist")
self._bands_used[bname] = True
self._power_used[pname] = True
# de-duplicate so binary database is more compact
bname = self._banddup[bname]
pname = self._powerdup[pname]
b = self._bands[bname]
p = self._power[pname]
try:
perm = Permission(b, p, flags)
except FlagError, e:
self._syntax_error("Invalid flag '%s'" % e.flag)
for cname, c in self._current_countries.iteritems():
if perm in c:
self._warn('Rule "%s, %s" added to "%s" twice' % (
bname, pname, cname))
else:
c.add(perm)
def parse(self, f):
self._current_countries = None
self._bands = {}
self._power = {}
self._countries = {}
self._bands_used = {}
self._power_used = {}
self._bandrev = {}
self._powerrev = {}
self._banddup = {}
self._powerdup = {}
self._bandline = {}
self._powerline = {}
self._comments = []
self._lineno = 0
for line in f:
self._lineno += 1
line = line.strip()
if line[0:1] == '#':
self._comments.append(line[1:].strip())
line = line.replace(' ', '').replace('\t', '')
if not line:
self._comments = []
line = line.split('#')[0]
if not line:
continue
if line[0:4] == 'band':
self._parse_band(line[4:])
self._current_countries = None
self._comments = []
elif line[0:5] == 'power':
self._parse_power(line[5:])
self._current_countries = None
self._comments = []
elif line[0:7] == 'country':
self._parse_country(line[7:])
self._comments = []
elif self._current_countries is not None:
self._parse_country_item(line)
self._comments = []
else:
self._syntax_error("Expected band, power or country definition")
countries = self._countries
bands = {}
for k, v in self._bands.iteritems():
if k in self._bands_used:
bands[self._banddup[k]] = v
continue
# we de-duplicated, but don't warn again about the dupes
if self._banddup[k] == k:
self._lineno = self._bandline[k]
self._warn('Unused band definition "%s"' % k)
power = {}
for k, v in self._power.iteritems():
if k in self._power_used:
power[self._powerdup[k]] = v
continue
# we de-duplicated, but don't warn again about the dupes
if self._powerdup[k] == k:
self._lineno = self._powerline[k]
self._warn('Unused power definition "%s"' % k)
return countries
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