1 files changed, 98 insertions, 0 deletions
diff --git a/src/local/biff_notify.c b/src/local/biff_notify.c
new file mode 100644
index 0000000..a6a4925
--- /dev/null
+++ b/src/local/biff_notify.c
@@ -0,0 +1,98 @@
+/*++
+/* NAME
+/*	biff_notify 3
+/* SUMMARY
+/*	send biff notification
+/* SYNOPSIS
+/*	#include <biff_notify.h>
+/*
+/*	void	biff_notify(text, len)
+/*	const char *text;
+/*	ssize_t	len;
+/* DESCRIPTION
+/*	biff_notify() sends a \fBBIFF\fR notification request to the
+/*	\fBcomsat\fR daemon.
+/*
+/*	Arguments:
+/* .IP text
+/*	Null-terminated text (username@mailbox-offset).
+/* .IP len
+/*	Length of text, including null terminator.
+/* BUGS
+/*	The \fBBIFF\fR "service" can be a noticeable load for
+/*	systems that have many logged-in users.
+/* 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
+/*--*/
+
+/* System library. */
+
+#include "sys_defs.h"
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <string.h>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <iostuff.h>
+
+/* Application-specific. */
+
+#include <biff_notify.h>
+
+/* biff_notify - notify recipient via the biff "protocol" */
+
+void    biff_notify(const char *text, ssize_t len)
+{
+    static struct sockaddr_in sin;
+    static int sock = -1;
+    struct hostent *hp;
+    struct servent *sp;
+
+    /*
+     * Initialize a socket address structure, or re-use an existing one.
+     */
+    if (sin.sin_family == 0) {
+	if ((sp = getservbyname("biff", "udp")) == 0) {
+	    msg_warn("service not found: biff/udp");
+	    return;
+	}
+	if ((hp = gethostbyname("localhost")) == 0) {
+	    msg_warn("host not found: localhost");
+	    return;
+	}
+	if ((int) hp->h_length > (int) sizeof(sin.sin_addr)) {
+	    msg_warn("bad address size %d for localhost", hp->h_length);
+	    return;
+	}
+	sin.sin_family = hp->h_addrtype;
+	sin.sin_port = sp->s_port;
+	memcpy((void *) &sin.sin_addr, hp->h_addr_list[0], hp->h_length);
+    }
+
+    /*
+     * Open a socket, or re-use an existing one.
+     */
+    if (sock < 0) {
+	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
+	    msg_warn("socket: %m");
+	    return;
+	}
+	close_on_exec(sock, CLOSE_ON_EXEC);
+    }
+
+    /*
+     * Biff!
+     */
+    if (sendto(sock, text, len, 0, (struct sockaddr *) &sin, sizeof(sin)) != len)
+	msg_warn("biff_notify: %m");
+}