ref: a411870ee4640241e3c494367d922847da84f972
dir: /appl/cmd/auth/factotum/factotum.b/
implement Factotum, Authio;
#
# Copyright © 2003-2004 Vita Nuova Holdings Limited
#
include "sys.m";
sys: Sys;
Rread, Rwrite: import Sys;
include "draw.m";
include "string.m";
str: String;
include "keyring.m";
include "authio.m";
include "arg.m";
include "readdir.m";
Factotum: module
{
init: fn(nil: ref Draw->Context, nil: list of string);
};
#confirm, log
Files: adt {
ctl: ref Sys->FileIO;
rpc: ref Sys->FileIO;
proto: ref Sys->FileIO;
needkey: ref Sys->FileIO;
};
Debug: con 0;
debug := Debug;
files: Files;
authio: Authio;
keymanc: chan of (list of ref Attr, int, chan of (list of ref Key, string));
init(nil: ref Draw->Context, args: list of string)
{
sys = load Sys Sys->PATH;
str = load String String->PATH;
authio = load Authio "$self";
svcname := "#sfactotum";
mntpt := "/mnt/factotum";
arg := load Arg Arg->PATH;
if(arg != nil){
arg->init(args);
arg->setusage("auth/factotum [-d] [-m /mnt/factotum] [-s factotum]");
while((o := arg->opt()) != 0)
case o {
'd' => debug++;
'm' => mntpt = arg->earg();
's' => svcname = "#s"+arg->earg();
* => arg->usage();
}
args = arg->argv();
if(args != nil)
arg->usage();
arg = nil;
}
sys->unmount(nil, mntpt);
if(sys->bind(svcname, mntpt, Sys->MREPL) < 0)
err(sys->sprint("can't bind %s on %s: %r", svcname, mntpt));
files.ctl = sys->file2chan(mntpt, "ctl");
files.rpc = sys->file2chan(mntpt, "rpc");
files.proto = sys->file2chan(mntpt, "proto");
files.needkey = sys->file2chan(mntpt, "needkey");
if(files.ctl == nil || files.rpc == nil || files.proto == nil || files.needkey == nil)
err(sys->sprint("can't create %s/*: %r", mntpt));
keymanc = chan of (list of ref Attr, int, chan of (list of ref Key, string));
spawn factotumsrv();
}
user(): string
{
fd := sys->open("/dev/user", Sys->OREAD);
if(fd == nil)
return nil;
b := array[Sys->NAMEMAX] of byte;
n := sys->read(fd, b, len b);
if(n <= 0)
return nil;
return string b[0:n];
}
err(s: string)
{
sys->fprint(sys->fildes(2), "factotum: %s\n", s);
raise "fail:error";
}
rlist: list of ref Fid;
factotumsrv()
{
sys->pctl(Sys->NEWPGRP|Sys->FORKFD|Sys->FORKENV, nil);
if(debug == 0)
privacy();
allkeys := array[0] of ref Key;
pidc := chan of int;
donec := chan of ref Fid;
# keyc := chan of (list of ref Attr, chan of (ref Key, string));
needfid := -1;
needed, needy: list of (int, list of ref Attr, chan of (list of ref Key, string));
needread: Sys->Rread;
needtag := 0;
for(;;) X: alt{
r := <-donec =>
r.pid = 0;
cleanfid(r.fid);
(off, nbytes, nil, rc) := <-files.ctl.read =>
if(rc == nil)
break;
s := "";
for(i := 0; i < len allkeys; i++)
if((k := allkeys[i]) != nil)
s += k.safetext()+"\n";
rc <-= reads(s, off, nbytes);
(nil, data, nil, wc) := <-files.ctl.write =>
if(wc == nil)
break;
(nf, flds) := sys->tokenize(string data, "\n\r");
if(nf > 1){
# compatibility with plan 9; has the advantage you can tell which key is wrong
wc <-= (0, "multiline write not allowed");
break;
}
if(flds == nil || (hd flds)[0] == '#'){
wc <-= (len data, nil);
break;
}
s := hd flds;
for(i := 0; i < len s && s[i] != ' '; i++){
# skip
}
verb := s[0:i];
if(i < len s)
i++;
s = s[i:];
case verb {
"key" =>
k := Key.mk(parseline(s));
if(k == nil){
wc <-= (len data, nil); # ignore it
break;
}
if(lookattrval(k.attrs, "proto") == nil){
wc <-= (0, "key without proto");
break;
}
allkeys = addkey(allkeys, k);
wc <-= (len data, nil);
"delkey" =>
attrs := parseline(s);
for(al := attrs; al != nil; al = tl al){
a := hd al;
if(a.name[0] == '!' && (a.val != nil || a.tag != Aquery)){
wc <-= (0, "cannot specify values for private fields");
break X;
}
}
if(delkey(allkeys, attrs) == 0)
wc <-= (0, "no matching keys");
else
wc <-= (len data, nil);
"debug" =>
wc <-= (len data, nil);
* =>
wc <-= (0, "unknown verb");
}
(nil, nbytes, fid, rc) := <-files.rpc.read =>
if(rc == nil)
break;
r := findfid(fid);
if(r == nil){
rc <-= (nil, "no rpc pending");
break;
}
alt{
r.read <-= (nbytes, rc) =>
;
* =>
rc <-= (nil, "concurrent rpc read not allowed");
}
(nil, data, fid, wc) := <-files.rpc.write =>
if(wc == nil){
cleanfid(fid);
break;
}
r := findfid(fid);
if(r == nil){
r = ref Fid(fid, 0, nil, nil, chan[1] of (array of byte, Rwrite), chan[1] of (int, Rread), 0, nil);
spawn request(r, pidc, donec);
r.pid = <-pidc;
rlist = r :: rlist;
}
# this non-blocking write avoids a potential deadlock situation that
# can happen when a proto module calls findkey at the same time
# a client tries to write to the rpc file. this might not be the correct fix!
alt{
r.write <-= (data, wc) =>
;
* =>
wc <-= (-1, "concurrent rpc write not allowed");
}
(off, nbytes, nil, rc) := <-files.proto.read =>
if(rc == nil)
break;
rc <-= reads(readprotos(), off, nbytes);
(nil, nil, nil, wc) := <-files.proto.write =>
if(wc != nil)
wc <-= (0, "illegal operation");
(nil, nil, fid, rc) := <-files.needkey.read =>
if(rc == nil)
break;
if(needfid >= 0 && fid != needfid){
rc <-= (nil, "file in use");
break;
}
needfid = fid;
if(needy != nil){
(tag, attr, kc) := hd needy;
needy = tl needy;
needed = (tag, attr, kc) :: needed;
rc <-= (sys->aprint("needkey tag=%ud %s", tag, attrtext(attr)), nil);
break;
}
if(needread != nil){
rc <-= (nil, "already reading");
break;
}
needread = rc;
(nil, data, fid, wc) := <-files.needkey.write =>
if(wc == nil){
if(needfid == fid){
needfid = -1; # TO DO? give needkey errors back to request
needread = nil;
}
break;
}
if(needfid >= 0 && fid != needfid){
wc <-= (0, "file in use");
break;
}
needfid = fid;
tagline := parseline(string data);
if(len tagline != 1 || (t := lookattrval(tagline, "tag")) == nil){
wc <-= (0, "no tag");
break;
}
tag := int t;
nl: list of (int, list of ref Attr, chan of (list of ref Key, string));
found := 0;
for(l := needed; l != nil; l = tl l){
(ntag, attrs, kc) := hd l;
if(tag == ntag){
found = 1;
k := findkey(allkeys, attrs);
if(k != nil)
kc <-= (k :: nil, nil);
else
kc <-= (nil, "needkey "+attrtext(attrs));
while((l = tl l) != nil)
nl = hd l :: nl;
break;
}
nl = hd l :: nl;
}
if(found)
wc <-= (len data, nil);
else
wc <-= (0, "tag not found");
(attrs, required, kc) := <-keymanc =>
# look for key and reply
kl := findkeys(allkeys, attrs);
if(kl != nil){
kc <-= (kl, nil);
break;
}else if(!required || needfid == -1){
kc <-= (nil, "needkey "+attrtext(attrs));
break;
}
# query surrounding environment using needkey
if(needread != nil){
needed = (needtag, attrs, kc) :: needed;
needread <-= (sys->aprint("needkey tag=%ud %s", needtag, attrtext(attrs)), nil);
needread = nil;
needtag++;
}else
needy = (needtag++, attrs, kc) :: needy;
}
}
findfid(fid: int): ref Fid
{
for(rl := rlist; rl != nil; rl = tl rl){
r := hd rl;
if(r.fid == fid)
return r;
}
return nil;
}
cleanfid(fid: int)
{
rl := rlist;
rlist = nil;
for(; rl != nil; rl = tl rl){
r := hd rl;
if(r.fid != fid)
rlist = r :: rlist;
else if(r.pid)
kill(r.pid);
}
}
kill(pid: int)
{
fd := sys->open("/prog/"+string pid+"/ctl", Sys->OWRITE);
if(fd != nil)
sys->fprint(fd, "kill");
}
privacy()
{
fd := sys->open("#p/"+string sys->pctl(0, nil)+"/ctl", Sys->OWRITE);
if(fd == nil || sys->fprint(fd, "private") < 0)
sys->fprint(sys->fildes(2), "factotum: warning: unable to make memory private: %r\n");
}
reads(str: string, off, nbytes: int): (array of byte, string)
{
bstr := array of byte str;
slen := len bstr;
if(off < 0 || off >= slen)
return (nil, nil);
if(off + nbytes > slen)
nbytes = slen - off;
if(nbytes <= 0)
return (nil, nil);
return (bstr[off:off+nbytes], nil);
}
readprotos(): string
{
readdir := load Readdir Readdir->PATH;
if(readdir == nil)
return "unknown\n";
(dirs, nil) := readdir->init("/dis/auth/proto", Readdir->NAME|Readdir->COMPACT);
s := "";
for(i := 0; i < len dirs; i++){
n := dirs[i].name;
if(len n > 4 && n[len n-4:] == ".dis")
s += n[0: len n-4]+"\n";
}
return s;
}
Ogok, Ostart, Oread, Owrite, Oauthinfo, Oattr: con iota;
ops := array[] of {
(Ostart, "start"),
(Oread, "read"),
(Owrite, "write"),
(Oauthinfo, "authinfo"),
(Oattr, "attr"),
};
request(r: ref Fid, pidc: chan of int, donec: chan of ref Fid)
{
pidc <-= sys->pctl(0, nil);
rpc := rio(r);
while(rpc != nil){
if(rpc.cmd == Ostart){
(proto, attrs, e) := startproto(string rpc.arg);
if(e != nil){
reply(rpc, "error "+e);
rpc = rio(r);
continue;
}
r.attrs = attrs; # saved for attr request
ok(rpc);
io := ref IO(r, nil);
{
err := proto->interaction(attrs, io);
if(debug && err != nil)
sys->fprint(sys->fildes(2), "factotum: failure: %s\n", err);
if(r.err == nil)
r.err = err;
r.done = 1;
}exception ex{
"*" =>
r.done = 0;
r.err = "exception "+ex;
}
if(r.err != nil)
io.error(r.err);
rpc = finish(r);
r.attrs = nil;
r.err = nil;
r.done = 0;
r.ai = nil;
}else
reply(rpc, "no current protocol");
}
flushreq(r, donec);
}
startproto(request: string): (Authproto, list of ref Attr, string)
{
attrs := parseline(request);
if(debug > 1)
sys->print("-> %s <-\n", attrtext(attrs));
p := lookattrval(attrs, "proto");
if(p == nil)
return (nil, nil, "did not specify protocol");
if(debug > 1)
sys->print("proto=%s\n", p);
if(any(p, "./")) # avoid unpleasantness
return (nil, nil, "illegal protocol: "+p);
proto := load Authproto "/dis/auth/proto/"+p+".dis";
if(proto == nil)
return (nil, nil, sys->sprint("protocol %s: %r", p));
if(debug)
sys->print("start %s\n", p);
e: string;
{
e = proto->init(authio);
}exception ex{
"*" =>
e = "exception "+ex;
}
if(e != nil)
return (nil, nil, e);
return (proto, attrs, nil);
}
finish(r: ref Fid): ref Rpc
{
while((rpc := rio(r)) != nil)
case rpc.cmd {
Owrite =>
phase(rpc, "protocol phase error");
Oread =>
if(r.err != nil)
reply(rpc, "error "+r.err);
else
done(rpc, r.ai);
Oauthinfo =>
if(r.done){
if(r.ai == nil)
reply(rpc, "error no authinfo available");
else{
a := packai(r.ai);
if(rpc.nbytes-3 < len a)
reply(rpc, sys->sprint("toosmall %d", len a + 3));
else
okdata(rpc, a);
}
}else
reply(rpc, "error authentication unfinished");
Ostart =>
return rpc;
* =>
reply(rpc, "error unexpected request");
}
return nil;
}
flushreq(r: ref Fid, donec: chan of ref Fid)
{
for(;;) alt{
donec <-= r =>
exit;
(nil, wc) := <-r.write =>
wc <-= (0, "write rpc protocol error");
(nil, rc) := <-r.read =>
rc <-= (nil, "read rpc protocol error");
}
}
rio(r: ref Fid): ref Rpc
{
req: array of byte;
for(;;) alt{
(data, wc) := <-r.write =>
if(req != nil){
wc <-= (0, "rpc pending; read to clear");
break;
}
req = data;
wc <-= (len data, nil);
(nbytes, rc) := <-r.read =>
if(req == nil){
rc <-= (nil, "no rpc pending");
break;
}
(cmd, arg) := op(req, ops);
req = nil;
rpc := ref Rpc(r, cmd, arg, nbytes, rc);
case cmd {
Ogok =>
reply(rpc, "error unknown rpc");
break;
Oattr =>
if(r.attrs == nil)
reply(rpc, "error no attributes");
else
reply(rpc, "ok "+attrtext(r.attrs));
break;
* =>
return rpc;
}
}
}
ok(rpc: ref Rpc)
{
reply(rpc, "ok");
}
okdata(rpc: ref Rpc, a: array of byte)
{
b := array[len a + 3] of byte;
b[0] = byte 'o';
b[1] = byte 'k';
b[2] = byte ' ';
b[3:] = a;
rpc.rc <-= (b, nil);
}
done(rpc: ref Rpc, ai: ref Authinfo)
{
rpc.r.ai = ai;
rpc.r.done = 1;
if(ai != nil)
reply(rpc, "done haveai");
else
reply(rpc, "done");
}
phase(rpc: ref Rpc, s: string)
{
reply(rpc, "phase "+s);
}
needkey(rpc: ref Rpc, attrs: list of ref Attr)
{
reply(rpc, "needkey "+attrtext(attrs));
}
reply(rpc: ref Rpc, s: string)
{
rpc.rc <-= reads(s, 0, rpc.nbytes);
}
puta(a: array of byte, n: int, v: array of byte): int
{
if(n < 0)
return -1;
c := len v;
if(n+2+c > len a)
return -1;
a[n++] = byte c;
a[n++] = byte (c>>8);
a[n:] = v;
return n + len v;
}
packai(ai: ref Authinfo): array of byte
{
a := array[1024] of byte;
i := puta(a, 0, array of byte ai.cuid);
i = puta(a, i, array of byte ai.suid);
i = puta(a, i, array of byte ai.cap);
i = puta(a, i, ai.secret);
if(i < 0)
return nil;
return a[0:i];
}
op(a: array of byte, ops: array of (int, string)): (int, array of byte)
{
arg: array of byte;
for(i := 0; i < len a; i++)
if(a[i] == byte ' '){
if(i+1 < len a)
arg = a[i+1:];
break;
}
s := string a[0:i];
for(i = 0; i < len ops; i++){
(cmd, name) := ops[i];
if(s == name)
return (cmd, arg);
}
return (Ogok, arg);
}
parseline(s: string): list of ref Attr
{
fld := str->unquoted(s);
rfld := fld;
for(fld = nil; rfld != nil; rfld = tl rfld)
fld = (hd rfld) :: fld;
attrs: list of ref Attr;
for(; fld != nil; fld = tl fld){
n := hd fld;
a := "";
tag := Aattr;
for(i:=0; i<len n; i++)
if(n[i] == '='){
a = n[i+1:];
n = n[0:i];
tag = Aval;
}
if(len n == 0)
continue;
if(tag == Aattr && len n > 1 && n[len n-1] == '?'){
tag = Aquery;
n = n[0:len n-1];
}
attrs = ref Attr(tag, n, a) :: attrs;
}
return attrs;
}
Attr.text(a: self ref Attr): string
{
case a.tag {
Aattr =>
return a.name;
Aval =>
return a.name+"="+a.val;
Aquery =>
return a.name+"?";
* =>
return "??";
}
}
attrtext(attrs: list of ref Attr): string
{
s := "";
sp := 0;
for(; attrs != nil; attrs = tl attrs){
if(sp)
s[len s] = ' ';
sp = 1;
s += (hd attrs).text();
}
return s;
}
lookattr(attrs: list of ref Attr, n: string): ref Attr
{
for(; attrs != nil; attrs = tl attrs)
if((a := hd attrs).tag != Aquery && a.name == n)
return a;
return nil;
}
lookattrval(attrs: list of ref Attr, n: string): string
{
if((a := lookattr(attrs, n)) != nil)
return a.val;
return nil;
}
anyattr(attrs: list of ref Attr, n: string): ref Attr
{
for(; attrs != nil; attrs = tl attrs)
if((a := hd attrs).name == n)
return a;
return nil;
}
reverse[T](l: list of T): list of T
{
r: list of T;
for(; l != nil; l = tl l)
r = hd l :: r;
return r;
}
setattrs(lv: list of ref Attr, rv: list of ref Attr): list of ref Attr
{
# new attributes
nl: list of ref Attr;
for(rl := rv; rl != nil; rl = tl rl)
if(anyattr(lv, (hd rl).name) == nil)
nl = ref(*hd rl) :: nl;
# new values
for(; lv != nil; lv = tl lv){
a := lookattr(rv, (hd lv).name); # won't take queries
if(a != nil)
nl = ref *a :: nl;
}
return reverse(nl);
}
delattrs(lv: list of ref Attr, rv: list of ref Attr): list of ref Attr
{
nl: list of ref Attr;
for(; lv != nil; lv = tl lv)
if(anyattr(rv, (hd lv).name) == nil)
nl = hd lv :: nl;
return reverse(nl);
}
ignored(s: string): int
{
return s == "role" || s == "disabled";
}
matchattr(attrs: list of ref Attr, pat: ref Attr): int
{
return (b := lookattr(attrs, pat.name)) != nil && (pat.tag == Aquery || b.val == pat.val) ||
ignored(pat.name);
}
matchattrs(pub: list of ref Attr, secret: list of ref Attr, pats: list of ref Attr): int
{
for(pl := pats; pl != nil; pl = tl pl)
if(!matchattr(pub, hd pl) && !matchattr(secret, hd pl))
return 0;
return 1;
}
sortattrs(attrs: list of ref Attr): list of ref Attr
{
a := array[len attrs] of ref Attr;
i := 0;
for(l := attrs; l != nil; l = tl l)
a[i++] = hd l;
shellsort(a);
for(i = 0; i < len a; i++)
l = a[i] :: l;
return l;
}
# sort into decreasing order (we'll reverse the list)
shellsort(a: array of ref Attr)
{
n := len a;
for(gap := n; gap > 0; ) {
gap /= 2;
max := n-gap;
ex: int;
do{
ex = 0;
for(i := 0; i < max; i++) {
j := i+gap;
if(a[i].name > a[j].name || a[i].name == nil) {
t := a[i]; a[i] = a[j]; a[j] = t;
ex = 1;
}
}
}while(ex);
}
}
findkey(keys: array of ref Key, attrs: list of ref Attr): ref Key
{
if(debug)
sys->print("findkey %q\n", attrtext(attrs));
for(i := 0; i < len keys; i++)
if((k := keys[i]) != nil && matchattrs(k.attrs, k.secrets, attrs))
return k;
return nil;
}
findkeys(keys: array of ref Key, attrs: list of ref Attr): list of ref Key
{
if(debug)
sys->print("findkey %q\n", attrtext(attrs));
kl: list of ref Key;
for(i := 0; i < len keys; i++)
if((k := keys[i]) != nil && matchattrs(k.attrs, k.secrets, attrs))
kl = k :: kl;
return reverse(kl);
}
delkey(keys: array of ref Key, attrs: list of ref Attr): int
{
nk := 0;
for(i := 0; i < len keys; i++)
if((k := keys[i]) != nil)
if(matchattrs(k.attrs, k.secrets, attrs)){
nk++;
keys[i] = nil;
}
return nk;
}
Key.mk(attrs: list of ref Attr): ref Key
{
k := ref Key;
for(; attrs != nil; attrs = tl attrs){
a := hd attrs;
if(a.name != nil){
if(a.name[0] == '!')
k.secrets = a :: k.secrets;
else
k.attrs = a :: k.attrs;
}
}
if(k.attrs != nil || k.secrets != nil)
return k;
return nil;
}
addkey(keys: array of ref Key, k: ref Key): array of ref Key
{
for(i := 0; i < len keys; i++)
if(keys[i] == nil){
keys[i] = k;
return keys;
}
n := array[len keys+1] of ref Key;
n[0:] = keys;
n[len keys] = k;
return n;
}
Key.text(k: self ref Key): string
{
s := attrtext(k.attrs);
if(s != nil && k.secrets != nil)
s[len s] = ' ';
return s + attrtext(k.secrets);
}
Key.safetext(k: self ref Key): string
{
s := attrtext(sortattrs(k.attrs));
sp := s != nil;
for(sl := k.secrets; sl != nil; sl = tl sl){
if(sp)
s[len s] = ' ';
s += sys->sprint("%s?", (hd sl).name);
}
return s;
}
any(s: string, t: string): int
{
for(i := 0; i < len s; i++)
for(j := 0; j < len t; j++)
if(s[i] == t[j])
return 1;
return 0;
}
IO.findkey(io: self ref IO, attrs: list of ref Attr, extra: string): (ref Key, string)
{
(kl, err) := io.findkeys(attrs, extra);
if(kl != nil)
return (hd kl, err);
return (nil, err);
}
IO.findkeys(nil: self ref IO, attrs: list of ref Attr, extra: string): (list of ref Key, string)
{
ea := parseline(extra);
for(; ea != nil; ea = tl ea)
attrs = hd ea :: attrs;
kc := chan of (list of ref Key, string);
keymanc <-= (attrs, 1, kc); # TO DO: 1 => 0 for not needed
return <-kc;
}
IO.needkey(nil: self ref IO, attrs: list of ref Attr, extra: string): (ref Key, string)
{
ea := parseline(extra);
for(; ea != nil; ea = tl ea)
attrs = hd ea :: attrs;
kc := chan of (list of ref Key, string);
keymanc <-= (attrs, 1, kc);
(kl, err) := <-kc;
if(kl != nil)
return (hd kl, err);
return (nil, err);
}
IO.read(io: self ref IO): array of byte
{
io.ok();
while((rpc := rio(io.f)) != nil)
case rpc.cmd {
* =>
phase(rpc, "protocol phase error");
Oauthinfo =>
reply(rpc, "error authentication unfinished");
Owrite =>
io.rpc = rpc;
if(rpc.arg == nil)
rpc.arg = array[0] of byte;
return rpc.arg;
}
exit;
}
IO.readn(io: self ref IO, n: int): array of byte
{
while((buf := io.read()) != nil && len buf < n)
io.toosmall(n);
return buf;
}
IO.write(io: self ref IO, buf: array of byte, n: int): int
{
io.ok();
while((rpc := rio(io.f)) != nil)
case rpc.cmd {
Oread =>
if(rpc.nbytes-3 >= n){
okdata(rpc, buf[0:n]);
return n;
}
io.rpc = rpc;
io.toosmall(n+3);
Oauthinfo =>
reply(rpc, "error authentication unfinished");
* =>
phase(rpc, "protocol phase error");
}
exit;
}
IO.rdwr(io: self ref IO): array of byte
{
io.ok();
while((rpc := rio(io.f)) != nil)
case rpc.cmd {
Oread =>
io.rpc = rpc;
if(rpc.nbytes >= 3)
return nil;
io.toosmall(128+3); # make them read something
Owrite =>
io.rpc = rpc;
if(rpc.arg == nil)
rpc.arg = array[0] of byte;
return rpc.arg;
Oauthinfo =>
reply(rpc, "error authentication unfinished");
* =>
phase(rpc, "protocol phase error");
}
exit;
}
IO.reply2read(io: self ref IO, buf: array of byte, n: int): int
{
if(io.rpc == nil)
return 0;
rpc := io.rpc;
if(rpc.cmd != Oread){
io.rpc = nil;
phase(rpc, "internal phase error");
return 0;
}
if(rpc.nbytes-3 < n){
io.toosmall(n+3);
return 0;
}
io.rpc = nil;
okdata(rpc, buf[0:n]);
return 1;
}
IO.ok(io: self ref IO)
{
if(io.rpc != nil){
reply(io.rpc, "ok");
io.rpc = nil;
}
}
IO.toosmall(io: self ref IO, n: int)
{
if(io.rpc != nil){
reply(io.rpc, sys->sprint("toosmall %d", n));
io.rpc = nil;
}
}
IO.error(io: self ref IO, s: string)
{
if(io.rpc != nil){
io.rpc.rc <-= (nil, "error "+s);
io.rpc = nil;
}
}
IO.done(io: self ref IO, ai: ref Authinfo)
{
io.f.ai = ai;
io.ok();
while((rpc := rio(io.f)) != nil)
case rpc.cmd {
Oread or Owrite =>
done(rpc, ai);
return;
* =>
phase(rpc, "protocol phase error");
}
}
memrandom(a: array of byte, n: int)
{
if(0){
# speed up testing
for(i := 0; i < len a; i++)
a[i] = byte i;
return;
}
fd := sys->open("/dev/notquiterandom", Sys->OREAD);
if(fd == nil)
err("can't open /dev/notquiterandom");
if(sys->read(fd, a, n) != n)
err("can't read /dev/notquiterandom");
}
eqbytes(a, b: array of byte): int
{
if(len a != len b)
return 0;
for(i := 0; i < len a; i++)
if(a[i] != b[i])
return 0;
return 1;
}
netmkaddr(addr, net, svc: string): string
{
if(net == nil)
net = "net";
(n, nil) := sys->tokenize(addr, "!");
if(n <= 1){
if(svc== nil)
return sys->sprint("%s!%s", net, addr);
return sys->sprint("%s!%s!%s", net, addr, svc);
}
if(svc == nil || n > 2)
return addr;
return sys->sprint("%s!%s", addr, svc);
}