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micropython-lib/micropython/udnspkt/udnspkt.py

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1.4 KiB
Python
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udnspkt: A module to create/parse DNS packets to resolve hostnames. This module implements "Sans I/O" approach, where packets are created/ parsed using BytesIO objects, and all networking happens outside the module. The module implements enough functionality to resolve a domain name into IP address, for both IPv4 and IPv6. Other DNS functionality is outside the scope of this module, that's why it's called *u*dnspkt. The API is experimental and subject to change. This module requires .readbin()/.writebin() methods on a stream.
2017-12-17 14:02:35 +00:00
def write_fqdn(buf, name):
parts = name.split(".")
for p in parts:
buf.writebin("B", len(p))
buf.write(p)
buf.writebin("B", 0)
def skip_fqdn(buf):
while True:
sz = buf.readbin("B")
if not sz:
break
all: Run black over all code. Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
2021-05-27 05:50:04 +00:00
if sz >= 0xC0:
udnspkt: A module to create/parse DNS packets to resolve hostnames. This module implements "Sans I/O" approach, where packets are created/ parsed using BytesIO objects, and all networking happens outside the module. The module implements enough functionality to resolve a domain name into IP address, for both IPv4 and IPv6. Other DNS functionality is outside the scope of this module, that's why it's called *u*dnspkt. The API is experimental and subject to change. This module requires .readbin()/.writebin() methods on a stream.
2017-12-17 14:02:35 +00:00
buf.readbin("B")
break
buf.read(sz)
def make_req(buf, fqdn, is_ipv6):
typ = 1 # A
if is_ipv6:
typ = 28 # AAAA
buf.writebin(">H", 0)
buf.writebin(">H", 0x100)
# q count
buf.writebin(">H", 1)
buf.writebin(">H", 0)
# squashed together
buf.writebin(">I", 0)
write_fqdn(buf, fqdn)
buf.writebin(">H", typ)
buf.writebin(">H", 1) # Class
def parse_resp(buf, is_ipv6):
typ = 1 # A
if is_ipv6:
typ = 28 # AAAA
all: Enable ruff F841 'Local variable is assigned to but never used'. Most of these look like they were used for print debugging and then kept in when the print statements were removed or commented. Some look like missing or incomplete functionality, these have been marked with comments where possible. Signed-off-by: Angus Gratton <angus@redyak.com.au>
2024-05-14 05:05:35 +00:00
buf.readbin(">H") # id
udnspkt: A module to create/parse DNS packets to resolve hostnames. This module implements "Sans I/O" approach, where packets are created/ parsed using BytesIO objects, and all networking happens outside the module. The module implements enough functionality to resolve a domain name into IP address, for both IPv4 and IPv6. Other DNS functionality is outside the scope of this module, that's why it's called *u*dnspkt. The API is experimental and subject to change. This module requires .readbin()/.writebin() methods on a stream.
2017-12-17 14:02:35 +00:00
flags = buf.readbin(">H")
assert flags & 0x8000
all: Enable ruff F841 'Local variable is assigned to but never used'. Most of these look like they were used for print debugging and then kept in when the print statements were removed or commented. Some look like missing or incomplete functionality, these have been marked with comments where possible. Signed-off-by: Angus Gratton <angus@redyak.com.au>
2024-05-14 05:05:35 +00:00
buf.readbin(">H") # qcnt
udnspkt: A module to create/parse DNS packets to resolve hostnames. This module implements "Sans I/O" approach, where packets are created/ parsed using BytesIO objects, and all networking happens outside the module. The module implements enough functionality to resolve a domain name into IP address, for both IPv4 and IPv6. Other DNS functionality is outside the scope of this module, that's why it's called *u*dnspkt. The API is experimental and subject to change. This module requires .readbin()/.writebin() methods on a stream.
2017-12-17 14:02:35 +00:00
acnt = buf.readbin(">H")
all: Enable ruff F841 'Local variable is assigned to but never used'. Most of these look like they were used for print debugging and then kept in when the print statements were removed or commented. Some look like missing or incomplete functionality, these have been marked with comments where possible. Signed-off-by: Angus Gratton <angus@redyak.com.au>
2024-05-14 05:05:35 +00:00
buf.readbin(">H") # nscnt
buf.readbin(">H") # addcnt
udnspkt: A module to create/parse DNS packets to resolve hostnames. This module implements "Sans I/O" approach, where packets are created/ parsed using BytesIO objects, and all networking happens outside the module. The module implements enough functionality to resolve a domain name into IP address, for both IPv4 and IPv6. Other DNS functionality is outside the scope of this module, that's why it's called *u*dnspkt. The API is experimental and subject to change. This module requires .readbin()/.writebin() methods on a stream.
2017-12-17 14:02:35 +00:00
skip_fqdn(buf)
all: Enable ruff F841 'Local variable is assigned to but never used'. Most of these look like they were used for print debugging and then kept in when the print statements were removed or commented. Some look like missing or incomplete functionality, these have been marked with comments where possible. Signed-off-by: Angus Gratton <angus@redyak.com.au>
2024-05-14 05:05:35 +00:00
buf.readbin(">H")
buf.readbin(">H")
udnspkt: A module to create/parse DNS packets to resolve hostnames. This module implements "Sans I/O" approach, where packets are created/ parsed using BytesIO objects, and all networking happens outside the module. The module implements enough functionality to resolve a domain name into IP address, for both IPv4 and IPv6. Other DNS functionality is outside the scope of this module, that's why it's called *u*dnspkt. The API is experimental and subject to change. This module requires .readbin()/.writebin() methods on a stream.
2017-12-17 14:02:35 +00:00
for i in range(acnt):
all: Run black over all code. Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
2021-05-27 05:50:04 +00:00
# print("Resp #%d" % i)
# v = read_fqdn(buf)
# print(v)
udnspkt: A module to create/parse DNS packets to resolve hostnames. This module implements "Sans I/O" approach, where packets are created/ parsed using BytesIO objects, and all networking happens outside the module. The module implements enough functionality to resolve a domain name into IP address, for both IPv4 and IPv6. Other DNS functionality is outside the scope of this module, that's why it's called *u*dnspkt. The API is experimental and subject to change. This module requires .readbin()/.writebin() methods on a stream.
2017-12-17 14:02:35 +00:00
skip_fqdn(buf)
all: Enable ruff F841 'Local variable is assigned to but never used'. Most of these look like they were used for print debugging and then kept in when the print statements were removed or commented. Some look like missing or incomplete functionality, these have been marked with comments where possible. Signed-off-by: Angus Gratton <angus@redyak.com.au>
2024-05-14 05:05:35 +00:00
t = buf.readbin(">H") # Type
buf.readbin(">H") # Class
buf.readbin(">I") # TTL
udnspkt: A module to create/parse DNS packets to resolve hostnames. This module implements "Sans I/O" approach, where packets are created/ parsed using BytesIO objects, and all networking happens outside the module. The module implements enough functionality to resolve a domain name into IP address, for both IPv4 and IPv6. Other DNS functionality is outside the scope of this module, that's why it's called *u*dnspkt. The API is experimental and subject to change. This module requires .readbin()/.writebin() methods on a stream.
2017-12-17 14:02:35 +00:00
rlen = buf.readbin(">H")
rval = buf.read(rlen)
if t == typ:
return rval