あなたの知らないネットワークプログラミングの世界

oraccha
Plan9 http://d.hatena.ne.jp/oraccha/

2009 11 5 VM

Thursday, November 5, 2009

Plan 9
• Plan 9 ...

• UNIX V1

• xv6

• V7/x86

• 2.11BSD

• X Window System


Plan 9

4th International Workshop on Plan 9

...


• Plan 9

• BSD dial(2)

• acid truss


Plan 9

•
• 9P
•

•
• open-read-write-close


...
UNIX
UNIX

•
• UCB

• GUI

• X MIT


API

•
open-read-write-close

• BSD

•


/net
•
•
• /net/ether0

• /net/^(arp icmp udp tcp)

• /net/^(cs dns)


/net/tcp
• /net/tcp/N

• ctl

• data

• /net/tcp/clone
% lc /net/tcp
0 1 10 ... clone stats

% lc /net/tcp/0
ctl data err listen local remote status


echo client
terminal 1:
% cat /net/tcp/clone open(“/net/tcp/clone”)
5 open(“/net/tcp/*/ctl”)

% cat > /net/tcp/clone

connect 204.178.31.2!7
terminal 2:
% cat /net/tcp/5/data &

% echo hoge > /net/tcp/5/data

echo


telnet client
clonefile=/net/tcp/clone
if(! ~ $#* 2) {
echo Usage: telnet ip port >[1=2]
exit usage
}

<[4] $clonefile {
netdir=`{basename -d $clonefile} ^ / ^
`{cat /fd/4}
echo connect $1!$2 >$netdir/ctl || exit
'cannot connect'
cat $netdir/data &
cat >$netdir/data
}

/net/cs
•
• clone
IP

% ndb/csquery

> tcp!www.bell-labs.com!http

/net/tcp/clone 135.245.1.14!80


•
% srv tcp!plan9.bell-labs.com!http foo
post...
% netstat -n
tcp 29 oraccha Established 58069 80 204.178.31.2
% echo GET /plan9/index.html >>/srv/foo
% cat /srv/foo
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01
Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
:
% rm /srv/foo

echo
int fd, n;

char *name;

name = netmkaddr(“plan9.bell-labs.com”,
“tcp”, “echo”); “204.178.31.2!echo
fd = dial(name, 0, 0, 0);

:
n = write(fd, buf, sizeof(buf));

read(1, buf, n);


echo
int acfd, lcfd, dfd, n;
char adir[40], ldir[40] /net/tcp/5
acfd = announce("tcp!*!7", adir);
for (;;) { /net/tcp/6
lcfd = listen(adir, ldir);
switch (fork()) { UNIX
case 0:
dfd = accept(lcfd, ldir);
while ((n = read(dfd, buf, sizeof(buf))) > 0)
write(dfd, buf, n);
exits(0);
}
}

BSD
Plan 9 BSD socket
dial active open fd
socket
announce passive open fd
dial connect active open
- bind
announce listen
listen/accept accept
reject close
- shutdown


• dial(2)

• /sys/src/libc/9sys/dial.c

• announce(2), listen(2), accept(2), reject(2)

• /sys/src/libc/9sys/announce.c

• netmkaddr(2)

• /sys/src/libc/port/netmkaddr.c

• /net/cs

• /sys/src/cmd/ndb/cs.c

acid truss (strace)
% acid -l truss a.out
a.out:386 plan 9 executable

/sys/lib/acid/port
/sys/lib/acid/truss
/sys/lib/acid/386
acid: new()
acid: truss()
:


echo truss /
# dial(2)
open("/net/cs", 2) # open connection server
return value: 3
pwrite(3, "tcp!192.168.0.1!8007", 20, -1) # translate the address
return value: 20
seek(0x00013e30, 3, 0, 0)
return value: 0
pread(3, 0x7fffec00, 127, -1)
return value: 31
data: "/net/tcp/clone 192.168.0.1!8007"


echo truss /
open("/net/tcp/clone", 2) # open clone file
return value: 4
pread(4, 0x7fffe7d0, 255, -1) # get directory name
return value: 2
data: "33"
# connect(2)
pwrite(4, "connect 192.168.0.1!8007", 24, -1) # connect
return value: 24
open("/net/tcp/33/data", 2) # open data connection
return value: 5
close(4) # close clone file
return value: 0
close(3) # close connection server
return value: 0


echo truss /
# echo
pread(0, 0x00014aa8, 4096, -1)
glenda # input “glenda” from stdin
return value: 7
data: "glenda
"
pwrite(5, "glenda
", 8, -1)
return value: 8
pread(5, 0x7fffee5c, 256, -1)
return value: 8
data: "glenda
"
pwrite(1, "glenda
", 8, -1)
glenda # output “glenda” to stdout
return value: 8


echod truss /
# announce(2)
open("/net/cs", 2) # open connection server
return value: 3
pwrite(3, "tcp!*!8007", 10, -1) # translate the address
return value: 10
seek(0x00007a94, 3, 0, 0)
return value: 0
pread(3, 0x7fffe8b4, 255, -1)
return value: 19
data: "/net/tcp/clone 8007"
close(3) # close connection server
return value: 0


echod truss /
open("/net/tcp/clone", 2) # open clone file
return value: 3
pread(3, 0x7fffece9, 246, -1) # get directory name
return value: 2
data: "29"
pwrite(3, "announce 8007", 13, -1) # announce service
return value: 13
# listen(2)
open("/net/tcp/29/listen", 2) # open listen file
return value: 4
pread(4, 0x7fffece9, 246, -1) # get directory name
return value: 2
data: "34"


echod truss /
# accept(2)
pwrite(4, "accept 34", 9, -1) # accept a call
return value: -1 # (ignore return value)
open("/net/tcp/34/data", 2) # open data file
return value: 5
# echod
pread(5, 0x7fffee04, 256, -1)
return value: 8
data: "glenda
"
pwrite(5, "glenda
", 8, -1)
return value: 8


• man dial(2)

• Pegasus by

• http://plan9.aichi-u.ac.jp/pegasus/


TODO
•
• TCP/IP

• TCP: 3200

• UDP: 620

•

•
• open-close-read-write

• Plan 9

•

Plan9 http://d.hatena.ne.jp/oraccha/

あなたの知らないネットワークプログラミングの世界

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