1 files changed, 137 insertions, 0 deletions
diff --git a/imap/capability.c b/imap/capability.c
new file mode 100644
index 0000000..25e77a2
--- /dev/null
+++ b/imap/capability.c
@@ -0,0 +1,137 @@
+/*
+** Copyright 1998 - 2008 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
+#include	"imapwrite.h"
+
+
+static int capa_keywords=0;
+
+extern const char *externalauth();
+
+void initcapability()
+{
+	const char *p=getenv("IMAP_KEYWORDS");
+
+	if (p) capa_keywords=atoi(p);
+}
+
+int have_starttls()
+{
+const char *p;
+
+	if ((p=getenv("IMAP_STARTTLS")) == 0)	return (0);
+	if (*p != 'y' && *p != 'Y')		return (0);
+
+	p=getenv("COURIERTLS");
+	if (!p || !*p)	return (0);
+	if (access(p, X_OK))	return (0);
+	return (1);
+}
+
+
+int tlsrequired()
+{
+const char *p=getenv("IMAP_TLS_REQUIRED");
+
+	if (p && atoi(p))       return (1);
+	return (0);
+}
+
+int keywords()
+{
+	return capa_keywords != 0;
+}
+
+int fastkeywords()
+{
+	return capa_keywords == 1;
+}
+
+int magictrash()
+{
+	const char *p;
+
+	p=getenv("IMAP_MOVE_EXPUNGE_TO_TRASH");
+
+	if (p && atoi(p))
+		return 1;
+	return 0;
+}
+
+const char *imap_externalauth()
+{
+	const char *p;
+
+	if ((p=getenv("IMAP_TLS")) && atoi(p))
+		return externalauth();
+
+	return NULL;
+}
+
+
+void imapcapability()
+{
+	const char *p;
+
+	if ((p=getenv("IMAP_TLS")) && atoi(p) &&
+	    (p=getenv("IMAP_CAPABILITY_TLS")) && *p)
+		writes(p);
+	else if ((p=getenv("IMAP_CAPABILITY")) != 0 && *p)
+		writes(p);
+	else
+		writes("IMAP4rev1");
+
+#if SMAP
+	p=getenv("SMAP_CAPABILITY");
+
+	if (p && *p)
+	{
+		writes(" ");
+		writes(p);
+
+		if (keywords())
+			writes(" KEYWORDS");
+	}
+#endif
+
+	if ((p=getenv("IMAP_ACL")) && atoi(p))
+		writes(" ACL ACL2=UNION");
+
+	if (getenv("IMAP_ID_FIELDS"))
+		writes(" ID");
+
+	if (have_starttls())
+	{
+		writes(" STARTTLS");
+		if (tlsrequired())
+			writes(" LOGINDISABLED");
+	}
+	else
+	{
+		if (imap_externalauth())
+			writes(" AUTH=EXTERNAL");
+	}
+			
+
+	p=getenv("OUTBOX");
+
+	if (p && *p)
+	{
+		writes(" XCOURIEROUTBOX=INBOX");
+		writes(p);
+	}
+
+	if (magictrash())
+		writes(" XMAGICTRASH");
+}