148 lines
4.8 KiB
Python
148 lines
4.8 KiB
Python
# Copyright 2016 Catalysts GmbH
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import ctypes as ct
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import sys
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import traceback
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import warnings
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import re
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from .libbcc import lib
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def _read_cpu_range(path):
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cpus = []
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with open(path, 'r') as f:
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cpus_range_str = f.read()
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for cpu_range in cpus_range_str.split(','):
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rangeop = cpu_range.find('-')
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if rangeop == -1:
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cpus.append(int(cpu_range))
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else:
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start = int(cpu_range[:rangeop])
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end = int(cpu_range[rangeop+1:])
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cpus.extend(range(start, end+1))
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return cpus
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def get_online_cpus():
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return _read_cpu_range('/sys/devices/system/cpu/online')
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def get_possible_cpus():
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return _read_cpu_range('/sys/devices/system/cpu/possible')
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def detect_language(candidates, pid):
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res = lib.bcc_procutils_language(pid)
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language = ct.cast(res, ct.c_char_p).value.decode()
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return language if language in candidates else None
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FILESYSTEMENCODING = sys.getfilesystemencoding()
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def printb(s, file=sys.stdout, nl=1):
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"""
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printb(s)
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print a bytes object to stdout and flush
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"""
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buf = file.buffer if hasattr(file, "buffer") else file
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buf.write(s)
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if nl:
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buf.write(b"\n")
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file.flush()
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class ArgString(object):
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"""
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ArgString(arg)
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encapsulate a system argument that can be easily coerced to a bytes()
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object, which is better for comparing to kernel or probe data (which should
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never be en/decode()'ed).
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"""
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def __init__(self, arg):
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if sys.version_info[0] >= 3:
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self.s = arg
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else:
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self.s = arg.decode(FILESYSTEMENCODING)
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def __bytes__(self):
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return self.s.encode(FILESYSTEMENCODING)
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def __str__(self):
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return self.s
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def warn_with_traceback(message, category, filename, lineno, file=None, line=None):
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log = file if hasattr(file, "write") else sys.stderr
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traceback.print_stack(f=sys._getframe(2), file=log)
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log.write(warnings.formatwarning(message, category, filename, lineno, line))
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# uncomment to get full tracebacks for invalid uses of python3+str in arguments
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#warnings.showwarning = warn_with_traceback
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_strict_bytes = False
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def _assert_is_bytes(arg):
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if arg is None:
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return arg
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if _strict_bytes:
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assert type(arg) is bytes, "not a bytes object: %r" % arg
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elif type(arg) is not bytes:
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warnings.warn("not a bytes object: %r" % arg, DeprecationWarning, 2)
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return ArgString(arg).__bytes__()
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return arg
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class StrcmpRewrite(object):
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@staticmethod
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def _generate_streq_function(string, probe_read_func, streq_functions,
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probeid):
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fname = "streq_%d" % probeid
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streq_functions += """
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static inline bool %s(char const *ignored, uintptr_t str) {
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char needle[] = %s;
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char haystack[sizeof(needle)];
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%s(&haystack, sizeof(haystack), (void *)str);
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for (int i = 0; i < sizeof(needle) - 1; ++i) {
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if (needle[i] != haystack[i]) {
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return false;
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}
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}
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return true;
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}
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""" % (fname, string, probe_read_func)
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return fname, streq_functions
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@staticmethod
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def rewrite_expr(expr, bin_cmp, is_user, probe_user_list, streq_functions,
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probeid):
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if bin_cmp:
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STRCMP_RE = 'STRCMP\\(\"([^"]+)\\",(.+?)\\)'
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else:
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STRCMP_RE = 'STRCMP\\(("[^"]+\\"),(.+?)\\)'
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matches = re.finditer(STRCMP_RE, expr)
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for match in matches:
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string = match.group(1)
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probe_read_func = "bpf_probe_read"
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# if user probe or @user tag is specified, use
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# bpf_probe_read_user for char* read
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if is_user or \
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match.group(2).strip() in probe_user_list:
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probe_read_func = "bpf_probe_read_user"
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fname, streq_functions = StrcmpRewrite._generate_streq_function(
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string, probe_read_func,
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streq_functions, probeid)
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probeid += 1
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expr = expr.replace("STRCMP", fname, 1)
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rdict = {
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"expr": expr,
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"streq_functions": streq_functions,
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"probeid": probeid
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}
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return rdict
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