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Revert "Revert "[Kubernetes]: The kube server could be used as http-p…
…roxy for docker (sonic-net#7469)" (sonic-net#8023)" (sonic-net#8158) This reverts commit 7236fa9. Restore original PR sonic-net#7469
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| #!/usr/bin/env python3 | ||
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| import ipaddress | ||
| import os | ||
| import re | ||
| import socket | ||
| import subprocess | ||
| import syslog | ||
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| UNIT_TESTING = 0 | ||
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| # NOTE: | ||
| # Unable to use python-iptables as that does not create rules per ip-tables default | ||
| # which is nf_tables. So rules added via iptc package will not be listed under | ||
| # "sudo iptables -t nat -L -n". But available in kernel. To list, we need to | ||
| # use legacy mode as "sudo iptables-legacy -t nat -L -n". | ||
| # As we can't use two modes and using non-default could make any debugging effort | ||
| # very tough. | ||
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| from urllib.parse import urlparse | ||
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| DST_FILE = "/etc/systemd/system/docker.service.d/http_proxy.conf" | ||
| DST_IP = None | ||
| DST_PORT = None | ||
| SQUID_PORT = "3128" | ||
|
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| def _get_ip(ip_str): | ||
| ret = "" | ||
| if ip_str: | ||
| try: | ||
| ipaddress.ip_address(ip_str) | ||
| ret = ip_str | ||
| except ValueError: | ||
| pass | ||
|
|
||
| if not ret: | ||
| try: | ||
| ret = socket.gethostbyname(ip_str) | ||
| except (OSError, socket.error): | ||
| pass | ||
| if not ret: | ||
| syslog.syslog(syslog.LOG_ERR, "{} is neither IP nor resolves to IP". | ||
| format(ip_str)) | ||
| return ret | ||
|
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| def _get_dst_info(): | ||
| global DST_IP, DST_PORT | ||
| DST_IP = None | ||
| DST_PORT = None | ||
| print("DST_FILE={}".format(DST_FILE)) | ||
| if os.path.exists(DST_FILE): | ||
| with open(DST_FILE, "r") as s: | ||
| for line in s.readlines(): | ||
| url_match = re.search('^Environment=.HTTP_PROXY=(.+?)"', line) | ||
| if url_match: | ||
| url = urlparse(url_match.group(1)) | ||
| DST_IP = _get_ip(url.hostname) | ||
| DST_PORT = url.port | ||
| break | ||
| else: | ||
| print("{} not available".format(DST_FILE)) | ||
| print("DST_IP={}".format(DST_IP)) | ||
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| def _is_rule_match(rule): | ||
| expect = "DNAT tcp -- 0.0.0.0/0 {} tcp dpt:{} to:".format( | ||
| DST_IP, DST_PORT) | ||
|
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| # Remove duplicate spaces | ||
| rule = " ".join(rule.split()).strip() | ||
|
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| if rule.startswith(expect): | ||
| return rule[len(expect):] | ||
| else: | ||
| return "" | ||
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| def check_proc(proc): | ||
| if proc.returncode: | ||
| syslog.syslog(syslog.LOG_ERR, "Failed to run: cmd: {}".format(proc.args)) | ||
| syslog.syslog(syslog.LOG_ERR, "Failed to run: stdout: {}".format(proc.stdout)) | ||
| syslog.syslog(syslog.LOG_ERR, "Failed to run: stderr: {}".format(proc.stderr)) | ||
| if not UNIT_TESTING: | ||
| assert False | ||
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| def iptable_proxy_rule_upd(ip_str, port = SQUID_PORT): | ||
| _get_dst_info() | ||
| if not DST_IP: | ||
| # There is no proxy in use. Bail out. | ||
| return "" | ||
|
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| destination = "" | ||
| if ip_str: | ||
| upd_ip = _get_ip(ip_str) | ||
| if not upd_ip: | ||
| return "" | ||
| destination = "{}:{}".format(upd_ip, port) | ||
|
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| found = False | ||
| num = 0 | ||
|
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| while True: | ||
| num += 1 | ||
|
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| cmd = "sudo iptables -t nat -n -L OUTPUT {}".format(num) | ||
| proc = subprocess.run(cmd, shell=True, capture_output=True) | ||
| check_proc(proc) | ||
|
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| if not proc.stdout: | ||
| # No more rule | ||
| break | ||
|
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| rule_dest = _is_rule_match(proc.stdout.decode("utf-8").strip()) | ||
| if rule_dest: | ||
| if not found and destination and (rule_dest == destination): | ||
| found = True | ||
| else: | ||
| # Duplicate or different IP - delete it | ||
| cmd = "sudo iptables -t nat -D OUTPUT {}".format(num) | ||
| proc = subprocess.run(cmd, shell=True, capture_output=True) | ||
| check_proc(proc) | ||
| # Decrement number to accommodate deleted rule | ||
| num -= 1 | ||
|
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| if destination and not found: | ||
| cmd = "sudo iptables -t nat -A OUTPUT -p tcp -d {} --dport {} -j DNAT --to-destination {}".format( | ||
| DST_IP, DST_PORT, destination) | ||
| proc = subprocess.run(cmd, shell=True, capture_output=True) | ||
|
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| check_proc(proc) | ||
|
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| return destination |
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