Белов Егор, 3530901/70201 lab2s

[EgoriusE]

Лаб. 2 сервер
Описание см. readme

[wrbbz]

Попытки загрузки и выгрузки файла на/с сервер(а) не привели к успеху:

Загрузка файла на сервер:

Клиент:

➜ atftp 167.99.132.136 1820
tftp> put intertwined
timeout: retrying...
timeout: retrying...
^Ctftp: unknown error.
tftp: aborting

Сервер:

ke@ubuntu-s-1vcpu-1gb-fra1-01:~/2020H2/src$ java tftp --host 167.99.132.136 -p 1820
Server Ready. Address: 167.99.132.136 Port: 1820
Write Request from /91.108.28.40
Time out, resend ack
Time out, resend ack
Time out, resend ack
Time out, resend ack
Write Request from /91.108.28.40
Client start failed:access violation, file exists
Time out, resend ack
Client failed:  Connection failed
Write Request from /91.108.28.40
Time out, resend ack
Time out, resend ack
Time out, resend ack
Time out, resend ack
Time out, resend ack
Client failed:  Connection failed

Выгрузка файла:

Клиент:

➜ atftp 167.99.132.136 1820
tftp> get test.txt
timeout: retrying...
timeout: retrying...
^Ctftp: unknown error.
tftp: aborting

Сервер:

ke@ubuntu-s-1vcpu-1gb-fra1-01:~/2020H2/src$ java tftp --host 167.99.132.136 -p 1820
Server Ready. Address: 167.99.132.136 Port: 1820
Read Request from /91.108.28.40
procce checking
send block no. 1
bytes sent:  516
current op code  3
Resent blk 1
Resent blk 1
Resent blk 1
Resent blk 1
Read Request from /91.108.28.40
procce checking
send block no. 1
bytes sent:  516
current op code  3
Resent blk 1
Client failed:  connection failed
Resent blk 1
Resent blk 1
Resent blk 1
Resent blk 1
Read Request from /91.108.28.40
procce checking
send block no. 1
bytes sent:  516
current op code  3
Resent blk 1
Client failed:  connection failed
Resent blk 1
Resent blk 1
Resent blk 1
Resent blk 1
Resent blk 1
Client failed:  connection failed

[EgoriusE]

Никак не получается воспроизвести.. может есть еще какие нибудь детали?
Провел повторное тестирование на windows и linux:
Windows:
Клиент:

C:\Users\egori>tftp -i 127.0.0.1 get pic.jpg
Успешная передача: 9934 байт за 1 сек., 9934 байт/с

C:\Users\egori>tftp -i 127.0.0.1 put .gitconfig
Успешная передача: 103 байт за 1 сек., 103 байт/с

Сервер

D:\Projects\Java\2020H2\src>java tftp
Server Ready. Address: 127.0.0.1 Port: 69
Read Request from /127.0.0.1
procce checking
send block no. 1
bytes sent:  516
current op code  3
confirm blk num 1 from 57852
send block no. 2
bytes sent:  516
<...>
confirm blk num 19 from 57852
send block no. 20
bytes sent:  210
current op code  3
confirm blk num 20 from 57852
Transfer completed.(Client /127.0.0.1)
Filename: pic.jpg
SHA1 checksum: 720a392b77c2bed1995cacf01034aa45b0f3f90f

Write Request from /127.0.0.1
Transfer completed.(Client /127.0.0.1)
Filename: .gitconfig
SHA1 checksum: a8b89f3971145245a570e46b8e1119cb0fbe8272

Linux:
клиент:

egorius@DESKTOP-DG9NQ0F:~$ sudo tftp
tftp> connect 127.0.0.1
tftp> put testfile2
Sent 17 bytes in 0.0 seconds
tftp> get pic.jpg
Received 9934 bytes in 0.0 seconds

сервер:

egorius@DESKTOP-DG9NQ0F:~/tftp-server/src$ sudo java tftp
Server Ready. Address: 127.0.0.1 Port: 69
Write Request from /127.0.0.1
Transfer completed.(Client /127.0.0.1)
Filename: testfile2
SHA1 checksum: 31bc9d52e8b5d15c0b826a37a3bbc2cf55dca69b

Read Request from /127.0.0.1
procce checking
send block no. 1
bytes sent:  516
current op code  3
confirm blk num 1 from 61873
send block no. 2
bytes sent:  516
current op code  3
confirm blk num 2 from 61873
send block no. 3
bytes sent:  516
current op code  3
confirm blk num 3 from 61873
send block no. 4
bytes sent:  516
current op code  3
confirm blk num 4 from 61873
send block no. 5
bytes sent:  516
current op code  3
confirm blk num 5 from 61873
send block no. 6
bytes sent:  516
current op code  3
<...>
send block no. 19
bytes sent:  516
current op code  3
confirm blk num 19 from 61873
send block no. 20
bytes sent:  210
current op code  3
confirm blk num 20 from 61873
Transfer completed.(Client /127.0.0.1)
Filename: pic.jpg
SHA1 checksum: 720a392b77c2bed1995cacf01034aa45b0f3f90f

[wrbbz]

Воспроизводится в том случае, когда сервер и клиент находятся на разных машинах.
Локально - да. Все хорошо

[EgoriusE]

Провел еще тестирования, теперь на разных машинах:

Если запускать мой сервер на windows и подключаться к нему с другой машины на линуксе, то все работает:
Клиент линукс

egorius@egor-pc:~/tfttp client/2020H2/src$ tftp
tftp> connect 192.168.0/103
192.168.0/103: unknown host
tftp> connect 192.168.0.103
tftp> get pic.jpg
Received 9934 bytes in 0.1 seconds
tftp> get pic.jpg
Received 9934 bytes in 0.1 seconds
tftp> quit
egorius@egor-pc:~/tfttp client/2020H2/src$ echo 'hello world smth' » test
egorius@egor-pc:~/tfttp client/2020H2/src$ tftp
tftp> connect 192.168.0.103
tftp> put test
Sent 18 bytes in 0.0 seconds
tftp>

Сервер windows:

D:\Projects\Java\2020H2\src>java tftp --host 192.168.0.103
Server Ready. Address: 192.168.0.103 Port: 69
Read Request from /192.168.0.106
procce checking
send block no. 1
bytes sent:  516
current op code  3
<...>
bytes sent:  210
current op code  3
confirm blk num 20 from 49388
Transfer completed.(Client /192.168.0.106)
Filename: pic.jpg
SHA1 checksum: 720a392b77c2bed1995cacf01034aa45b0f3f90f

Read Request from /192.168.0.106
procce checking
send block no. 1
bytes sent:  516
<...>
send block no. 20
bytes sent:  210
current op code  3
confirm blk num 20 from 58982
Transfer completed.(Client /192.168.0.106)
Filename: pic.jpg
SHA1 checksum: 720a392b77c2bed1995cacf01034aa45b0f3f90f

Write Request from /192.168.0.106
Transfer completed.(Client /192.168.0.106)
Filename: test
SHA1 checksum: db94c45efe004e27943eeea48801ff4a552cc30d

Пакеты отловленные в wireshark

НО если запускать сервер на линуксе (в моем случае ubuntu 18.04) и подключаться с другой машины - то не работает. Причем если подключаться к серверу локально на линуксе, то работает
Так и не смог найти причину

[wrbbz]

Да. В этом и была проблема. Локально рабоотало, при связи Линукс-Линукс - нет. Но, судя по пакетам из Wireshark все ок. Так что: зачет