New submission from Sworddragon:
If I'm receiving data from a socket (several bytes) and making the first call
to socket.recv(1) all is fine but the second call won't get any further data.
But doing this again with socket.recv(2) instead will successfully get the 2
bytes. Here is a testcase:
Script:
def icmp_packet(type, code, data):
length_data = len(data)
if length_data % 2 == 1:
data += b'\x00'
checksum = code | type << 8
i = 0
while i < length_data:
checksum += data[i + 1] | data[i] << 8
checksum = (checksum & 65535) + (checksum >> 16)
i += 2
return bytes([type]) + bytes([code]) + (checksum ^ 65535).to_bytes(2,
'big') + data
import socket
connection = socket.socket(proto = socket.IPPROTO_ICMP, type = socket.SOCK_RAW)
connection.settimeout(1)
connection.sendto(icmp_packet(8, 0, b'\x00\x00\x00\x00'), ('8.8.8.8', 0))
print(connection.recv(2))
connection.close()
connection = socket.socket(proto = socket.IPPROTO_ICMP, type = socket.SOCK_RAW)
connection.settimeout(1)
connection.sendto(icmp_packet(8, 0, b'\x00\x00\x00\x00'), ('8.8.8.8', 0))
print(connection.recv(1))
print(connection.recv(1))
connection.close()
Here is the result:
root@ubuntu:/home/sworddragon/tmp# python3 test.py
b'E\x00'
b'E'
Traceback (most recent call last):
File "test.py", line 24, in <module>
print(connection.recv(1))
socket.timeout: timed out
----------
components: Library (Lib)
messages: 221155
nosy: Sworddragon
priority: normal
severity: normal
status: open
title: Remaining buffer from socket isn't available anymore after calling
socket.recv the first time
type: behavior
versions: Python 3.4
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Python tracker <[email protected]>
<http://bugs.python.org/issue21819>
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