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implement CPU;
include "sys.m";
sys: Sys;
stderr: ref Sys->FD;
include "draw.m";
include "string.m";
str: String;
include "arg.m";
include "keyring.m";
include "security.m";
include "dial.m";
DEFCMD: con "/dis/sh";
CPU: module
{
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
badmodule(p: string)
{
sys->fprint(stderr, "cpu: cannot load %s: %r\n", p);
raise "fail:bad module";
}
usage()
{
sys->fprint(stderr, "Usage: cpu [-C cryptoalg] mach command args...\n");
raise "fail:usage";
}
# The default level of security is NOSSL, unless
# the keyring directory doesn't exist, in which case
# it's disallowed.
init(nil: ref Draw->Context, argv: list of string)
{
sys = load Sys Sys->PATH;
stderr = sys->fildes(2);
arg := load Arg Arg->PATH;
if (arg == nil) badmodule(Arg->PATH);
str = load String String->PATH;
if (str == nil) badmodule(String->PATH);
au := load Auth Auth->PATH;
if (au == nil) badmodule(Auth->PATH);
kr := load Keyring Keyring->PATH;
if (kr == nil) badmodule(Keyring->PATH);
dial := load Dial Dial->PATH;
arg->init(argv);
alg := "";
while ((opt := arg->opt()) != 0) {
if (opt == 'C') {
alg = arg->arg();
} else
usage();
}
argv = arg->argv();
args := "auxi/cpuslave";
# if(ctxt != nil && ctxt.screen != nil)
# args += " -s" + string ctxt.screen.id;
# else
args += " --";
mach: string;
case len argv {
0 =>
usage();
1 =>
mach = hd argv;
args += " " + DEFCMD;
* =>
mach = hd argv;
args += " " + str->quoted(tl argv);
}
user := getuser();
kd := "/usr/" + user + "/keyring/";
cert := kd + dial->netmkaddr(mach, "tcp", "");
if (!exists(cert)) {
cert = kd + "default";
if (!exists(cert)) {
sys->fprint(stderr, "cpu: cannot find certificate in %s; use getauthinfo\n", kd);
raise "fail:no certificate";
}
}
c := dial->dial(dial->netmkaddr(mach, "net", "rstyx"), nil);
if(c == nil){
sys->fprint(stderr, "cpu: can't dial %s: %r\n", mach);
raise "fail:dial";
}
ai := kr->readauthinfo(cert);
if (alg == nil)
alg = "none";
err := au->init();
if(err != nil) {
sys->fprint(stderr, "cpu: cannot initialise auth module: %s\n", err);
raise "fail:auth init failed";
}
fd := ref Sys->FD;
#sys->fprint(stderr, "cpu: authenticating using alg '%s'\n", alg);
(fd, err) = au->client(alg, ai, c.dfd);
if(fd == nil) {
sys->fprint(stderr, "cpu: authentication failed: %s\n", err);
raise "fail:authentication failure";
}
t := array of byte sys->sprint("%d\n%s\n", len (array of byte args)+1, args);
if(sys->write(fd, t, len t) != len t){
sys->fprint(stderr, "cpu: export args write error: %r\n");
raise "fail:write error";
}
if(sys->export(fd, "/", sys->EXPWAIT) < 0){
sys->fprint(stderr, "cpu: export failed: %r\n");
raise "fail:export error";
}
}
exists(file: string): int
{
(ok, nil) := sys->stat(file);
return ok != -1;
}
getuser(): string
{
fd := sys->open("/dev/user", sys->OREAD);
if(fd == nil){
sys->fprint(stderr, "cpu: cannot open /dev/user: %r\n");
raise "fail:no user id";
}
buf := array[50] of byte;
n := sys->read(fd, buf, len buf);
if(n < 0){
sys->fprint(stderr, "cpu: cannot read /dev/user: %r\n");
raise "fail:no user id";
}
return string buf[0:n];
}
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