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utils.py

# Copyright 2016 Catalysts GmbH
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import ctypes as ct
import sys
import traceback
import warnings
import re

from .libbcc import lib

def _read_cpu_range(path):
    cpus = []
    with open(path, 'r') as f:
        cpus_range_str = f.read()
        for cpu_range in cpus_range_str.split(','):
            rangeop = cpu_range.find('-')
            if rangeop == -1:
                cpus.append(int(cpu_range))
            else:
                start = int(cpu_range[:rangeop])
                end = int(cpu_range[rangeop+1:])
                cpus.extend(range(start, end+1))
    return cpus

def get_online_cpus():
    return _read_cpu_range('/sys/devices/system/cpu/online')

def get_possible_cpus():
    return _read_cpu_range('/sys/devices/system/cpu/possible')

def detect_language(candidates, pid):
    res = lib.bcc_procutils_language(pid)
    language = ct.cast(res, ct.c_char_p).value.decode()
    return language if language in candidates else None

FILESYSTEMENCODING = sys.getfilesystemencoding()

def printb(s, file=sys.stdout, nl=1):
    """
    printb(s)

print a bytes object to stdout and flush
    """
    buf = file.buffer if hasattr(file, "buffer") else file

buf.write(s)
    if nl:
        buf.write(b"\n")
    file.flush()

class ArgString(object):
    """
    ArgString(arg)

encapsulate a system argument that can be easily coerced to a bytes()
    object, which is better for comparing to kernel or probe data (which should
    never be en/decode()'ed).
    """
    def __init__(self, arg):
        if sys.version_info[0] >= 3:
            self.s = arg
        else:
            self.s = arg.decode(FILESYSTEMENCODING)

def __bytes__(self):
        return self.s.encode(FILESYSTEMENCODING)

def __str__(self):
        return self.s

def warn_with_traceback(message, category, filename, lineno, file=None, line=None):
    log = file if hasattr(file, "write") else sys.stderr
    traceback.print_stack(f=sys._getframe(2), file=log)
    log.write(warnings.formatwarning(message, category, filename, lineno, line))

# uncomment to get full tracebacks for invalid uses of python3+str in arguments
#warnings.showwarning = warn_with_traceback

_strict_bytes = False
def _assert_is_bytes(arg):
    if arg is None:
        return arg
    if _strict_bytes:
        assert type(arg) is bytes, "not a bytes object: %r" % arg
    elif type(arg) is not bytes:
        warnings.warn("not a bytes object: %r" % arg, DeprecationWarning, 2)
        return ArgString(arg).__bytes__()
    return arg

class StrcmpRewrite(object):
    @staticmethod
    def _generate_streq_function(string, probe_read_func, streq_functions,
                                probeid):
        fname = "streq_%d" % probeid
        streq_functions += """
static inline bool %s(char const *ignored, uintptr_t str) {
        char needle[] = %s;
        char haystack[sizeof(needle)];
        %s(&haystack, sizeof(haystack), (void *)str);
        for (int i = 0; i < sizeof(needle) - 1; ++i) {
                if (needle[i] != haystack[i]) {
                        return false;
                }
        }
        return true;
}
        """ % (fname, string, probe_read_func)
        return fname, streq_functions

@staticmethod
    def rewrite_expr(expr, bin_cmp, is_user, probe_user_list, streq_functions,
                    probeid):
        if bin_cmp:
            STRCMP_RE = 'STRCMP\\(\"([^"]+)\\",(.+?)\\)'
        else:
            STRCMP_RE = 'STRCMP\\(("[^"]+\\"),(.+?)\\)'
        matches = re.finditer(STRCMP_RE, expr)
        for match in matches:
            string = match.group(1)
            probe_read_func = "bpf_probe_read"
            # if user probe or @user tag is specified, use
            # bpf_probe_read_user for char* read
            if is_user or \
                match.group(2).strip() in probe_user_list:
                    probe_read_func = "bpf_probe_read_user"
            fname, streq_functions = StrcmpRewrite._generate_streq_function(
                                            string, probe_read_func,
                                            streq_functions, probeid)
            probeid += 1
            expr = expr.replace("STRCMP", fname, 1)
        rdict = {
            "expr": expr,
            "streq_functions": streq_functions,
            "probeid": probeid
        }
        return rdict

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	0/0	0755	2024-11-07 05:05:38
..	dir	-	0/0	0755	2026-04-28 05:55:45
__pycache__	dir	-	0/0	0755	2024-11-07 05:05:38
__init__.py	text/x-script.python	66.1 KB	0/0	0644	2024-11-05 09:24:10
containers.py	text/x-script.python	3.6 KB	0/0	0644	2024-11-05 09:24:10
disassembler.py	text/x-script.python	20.24 KB	0/0	0644	2024-11-05 09:24:10
libbcc.py	text/x-script.python	14.22 KB	0/0	0644	2024-11-05 09:24:10
perf.py	text/x-script.python	8.13 KB	0/0	0644	2024-11-05 09:24:10
syscall.py	text/plain	9.43 KB	0/0	0644	2024-11-05 09:24:10
table.py	text/x-script.python	47.97 KB	0/0	0644	2024-11-05 09:24:10
tcp.py	text/x-script.python	1.55 KB	0/0	0644	2024-11-05 09:24:10
usdt.py	text/x-script.python	9.05 KB	0/0	0644	2024-11-05 09:24:10
utils.py	text/x-script.python	4.78 KB	0/0	0644	2024-11-05 09:24:10
version.py	text/plain	23 B	0/0	0644	2024-11-05 09:24:10

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