Merge pull request #14 from pete/add-whois

Add whois(1)

1 files changed, 89 insertions, 0 deletions

diff --git a/appl/cmd/whois.b b/appl/cmd/whois.b
new file mode 100644
index 00000000..f89fb601
--- /dev/null
+++ b/appl/cmd/whois.b
@@ -0,0 +1,89 @@
+implement Whois;
+
+include "sys.m"; sys: Sys;
+include "draw.m";
+include "dial.m"; dial: Dial;
+include "arg.m";
+
+Whois: module {
+	init: fn(nil: ref Draw->Context, args: list of string);
+};
+
+init(nil: ref Draw->Context, args: list of string) {
+	sys = load Sys Sys->PATH;
+	dial = load Dial Dial->PATH;
+	arg := load Arg Arg->PATH;
+
+	addr := "tcp!whois.iana.org!43";
+	expect_refer := 5;
+
+	arg->init(args);
+	arg->setusage("whois [-a addr] [-n] host");
+	while((opt := arg->opt()) != 0) {
+		case opt {
+		'a' =>
+			addr = dial->netmkaddr(arg->earg(), "tcp", "43");
+		'n' =>
+			expect_refer = 0;
+		* =>
+			arg->usage();
+		}
+	}
+
+	args = arg->argv();
+	if(len args != 1)
+		arg->usage();
+
+	host := hd args;
+	fd := whois(addr, host);
+
+	buf := array[512] of byte;
+	stdout := sys->fildes(1);
+	while((i := sys->read(fd, buf, len buf)) > 0) {
+		if(expect_refer) {
+			ls := sys->tokenize(string buf[0:i], "\n").t1;
+			newaddr: string = nil;
+			while(ls != nil) {
+				l := hd ls;
+				(n, rs) := sys->tokenize(l, " \t");
+				if(n == 2 && hd rs == "refer:") {
+					newaddr = dial->netmkaddr(hd tl rs, "tcp", "43");
+					break;
+				} else if(n == 3 && hd rs == "Whois" && hd tl rs == "Server:") {
+					newaddr = dial->netmkaddr(hd tl tl rs, "tcp", "43");
+					break;
+				}
+				ls = tl ls;
+			}
+			if(newaddr != nil) {
+				fd = whois(newaddr, host);
+				expect_refer--;
+				continue;
+			}
+		}
+		sys->write(stdout, buf, i);
+	}
+	if(i < 0) {
+		sys->fprint(sys->fildes(2), "whois: reading info: %r\n");
+		raise "fail:errors";
+	}
+}
+
+whois(addr: string, host: string): ref Sys->FD
+{
+	sys->print("[using server %s]\n", addr);
+	conn := dial->dial(addr, nil);
+	if(conn == nil) {
+		sys->fprint(sys->fildes(2), "whois: dialing %s: %r\n", addr);
+		raise "fail:errors";
+	}
+
+	fd := conn.dfd;
+	i := sys->fprint(fd, "%s\r\n", host);
+	if(i != len host + 2) {
+		sys->fprint(sys->fildes(2), "whois: sending name: %r\n");
+		raise "fail:errors";
+	}
+
+	return fd;
+}