1 files changed, 103 insertions, 0 deletions
diff --git a/src/global/split_addr.c b/src/global/split_addr.c
new file mode 100644
index 0000000..fb8bb34
--- /dev/null
+++ b/src/global/split_addr.c
@@ -0,0 +1,103 @@
+/*++
+/* NAME
+/*	split_addr 3
+/* SUMMARY
+/*	recipient localpart address splitter
+/* SYNOPSIS
+/*	#include <split_addr.h>
+/*
+/*	char	*split_addr_internal(localpart, delimiter_set)
+/*	char	*localpart;
+/*	const char *delimiter_set;
+/* LEGACY SUPPORT
+/*	char	*split_addr(localpart, delimiter_set)
+/*	char	*localpart;
+/*	const char *delimiter_set;
+/* DESCRIPTION
+/*	split_addr*() null-terminates \fIlocalpart\fR at the first
+/*	occurrence of the \fIdelimiter\fR character(s) found, and
+/*	returns a pointer to the remainder.
+/*
+/*	With split_addr_internal(), the address must be in internal
+/*	(unquoted) form.
+/*
+/*	split_addr() is a backwards-compatible form for legacy code.
+/*
+/*	Reserved addresses are not split: postmaster, mailer-daemon,
+/*	double-bounce. Addresses that begin with owner-, or addresses
+/*	that end in -request are not split when the owner_request_special
+/*	parameter is set.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <string.h>
+
+#ifdef STRCASECMP_IN_STRINGS_H
+#include <strings.h>
+#endif
+
+/* Utility library. */
+
+#include <split_at.h>
+#include <stringops.h>
+
+/* Global library. */
+
+#include <mail_params.h>
+#include <mail_addr.h>
+#include <split_addr.h>
+
+/* split_addr_internal - split address with extreme prejudice */
+
+char   *split_addr_internal(char *localpart, const char *delimiter_set)
+{
+    ssize_t len;
+
+    /*
+     * Don't split these, regardless of what the delimiter is.
+     */
+    if (strcasecmp(localpart, MAIL_ADDR_POSTMASTER) == 0)
+	return (0);
+    if (strcasecmp(localpart, MAIL_ADDR_MAIL_DAEMON) == 0)
+	return (0);
+    if (strcasecmp_utf8(localpart, var_double_bounce_sender) == 0)
+	return (0);
+
+    /*
+     * Backwards compatibility: don't split owner-foo or foo-request.
+     */
+    if (strchr(delimiter_set, '-') != 0 && var_ownreq_special != 0) {
+	if (strncasecmp(localpart, "owner-", 6) == 0)
+	    return (0);
+	if ((len = strlen(localpart) - 8) > 0
+	    && strcasecmp(localpart + len, "-request") == 0)
+	    return (0);
+    }
+
+    /*
+     * Safe to split this address. Do not split the address if the result
+     * would have a null localpart.
+     */
+    if ((len = strcspn(localpart, delimiter_set)) == 0 || localpart[len] == 0) {
+	return (0);
+    } else {
+	localpart[len] = 0;
+	return (localpart + len + 1);
+    }
+}