--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lib/courier-authlib/chain.c	Wed Jan 16 22:39:43 2008 +0100
@@ -0,0 +1,67 @@
+/*
+** Copyright 1998 - 1999 Double Precision, Inc.  See COPYING for
+** distribution information.
+*/
+
+#if	HAVE_CONFIG_H
+#include	"config.h"
+#endif
+#include	<stdio.h>
+#include	<stdlib.h>
+#include	<string.h>
+#if	HAVE_UNISTD_H
+#include	<unistd.h>
+#endif
+#if	HAVE_FCNTL_H
+#include	<fcntl.h>
+#endif
+
+#include	"auth.h"
+
+static const char rcsid[]="$Id: chain.c,v 1.1 2000/04/13 17:55:05 bruce Exp $";
+
+void authchain(int argc, char **argv, const char *buf)
+{
+int	pipes[2];
+pid_t	p;
+int	l, n;
+char	**vec;
+char	*prog;
+
+	vec=authcopyargv(argc, argv, &prog);
+	if (!prog || open("/dev/null", O_RDONLY) != 3)	authexit(1);
+
+	if (pipe(pipes))
+	{
+		perror("pipe");
+		authexit(1);
+	}
+	while ((p=fork()) < 0)
+	{
+		perror("fork");
+		sleep(3);
+	}
+	close(3);
+
+	if (p)
+	{
+		dup(pipes[0]);
+		close(pipes[0]);
+		close(pipes[1]);
+		execv(prog, vec);
+		perror(prog);
+		authexit(1);
+	}
+	l=strlen(buf);
+	close(3);
+	close(pipes[0]);
+	while (l)
+	{
+		n=write(pipes[1], buf, l);
+		if (n <= 0)	break;
+		buf += n;
+		l -= n;
+	}
+	close(pipes[1]);
+	authexit(1);
+}