--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rvinterf/lowlevel/localsock.c	Sat Jun 11 00:13:35 2016 +0000
@@ -0,0 +1,180 @@
+/*
+ * This rvinterf module handles the local UNIX domain socket interface
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <stdio.h>
+#include <string.h>
+#include <strings.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "../include/localsock.h"
+#include "client.h"
+
+int listener;
+
+extern struct client *client_head;
+extern int max_fd;
+extern char *socket_pathname;
+extern int socketpair_fd;
+
+create_listener_socket()
+{
+	/* local socket binding voodoo copied from osmocon */
+	struct sockaddr_un local;
+	unsigned int namelen;
+	int rc;
+
+	listener = socket(AF_UNIX, SOCK_STREAM, 0);
+	if (listener < 0) {
+		perror("socket(AF_UNIX, SOCK_STREAM, 0)");
+		exit(1);
+	}
+
+	local.sun_family = AF_UNIX;
+	strncpy(local.sun_path, socket_pathname, sizeof(local.sun_path));
+	local.sun_path[sizeof(local.sun_path) - 1] = '\0';
+	unlink(local.sun_path);
+
+	/* we use the same magic that X11 uses in Xtranssock.c for
+	 * calculating the proper length of the sockaddr */
+#if defined(BSD44SOCKETS) || defined(__UNIXWARE__)
+	local.sun_len = strlen(local.sun_path);
+#endif
+#if defined(BSD44SOCKETS) || defined(SUN_LEN)
+	namelen = SUN_LEN(&local);
+#else
+	namelen = strlen(local.sun_path) +
+		  offsetof(struct sockaddr_un, sun_path) + 1;
+#endif
+
+	rc = bind(listener, (struct sockaddr *) &local, namelen);
+	if (rc != 0) {
+		perror("bind on local socket");
+		exit(1);
+	}
+	rc = listen(listener, 3);
+	if (rc != 0) {
+		perror("listen");
+		exit(1);
+	}
+
+	if (listener > max_fd)
+		max_fd = listener;
+	return(0);
+}
+
+static void
+prep_for_length_rx(cli)
+	struct client *cli;
+{
+	cli->rx_state = 0;
+	cli->rx_ptr = cli->rx_buf;
+	cli->rx_left = 2;
+}
+
+static void
+prep_for_message_rx(cli)
+	struct client *cli;
+{
+	cli->rx_state = 1;
+	cli->rx_ptr = cli->rx_buf;
+	cli->rx_left = cli->rx_msglen;
+}
+
+handle_listener_select()
+{
+	struct sockaddr_un un_addr;
+	socklen_t len;
+	int rc;
+	struct client *newcli;
+
+	len = sizeof(un_addr);
+	rc = accept(listener, (struct sockaddr *) &un_addr, &len);
+	if (rc < 0) {
+		perror("rvinterf: accept");
+		exit(1);
+	}
+	if (rc > max_fd)
+		max_fd = rc;
+	newcli = malloc(sizeof(struct client));
+	if (!newcli) {
+		perror("rvinterf: malloc for new client");
+		exit(1);
+	}
+	bzero(newcli, sizeof(struct client));
+	newcli->fd = rc;
+	newcli->next = client_head;
+	client_head = newcli;
+	prep_for_length_rx(newcli);
+	output_line("*** Client program connected");
+	return(0);
+}
+
+create_socketpair_client()
+{
+	struct client *cli;
+
+	if (socketpair_fd > max_fd)
+		max_fd = socketpair_fd;
+	cli = malloc(sizeof(struct client));
+	if (!cli) {
+		perror("rvinterf: malloc for socketpair client");
+		exit(1);
+	}
+	bzero(cli, sizeof(struct client));
+	cli->fd = socketpair_fd;
+	client_head = cli;
+	prep_for_length_rx(cli);
+	return(0);
+}
+
+send_local_msg_to_client(cli, msg)
+	struct client *cli;
+	char *msg;
+{
+	int len, len1;
+	u_char hdr[3];
+
+	len = strlen(msg);
+	len1 = len + 1;
+	hdr[0] = len1 >> 8;
+	hdr[1] = len1 & 0xFF;
+	hdr[2] = RVI2CLI_LOCAL_CMD_RESP;
+	write(cli->fd, hdr, 3);
+	write(cli->fd, msg, len);
+}
+
+void
+handle_client_select(cli)
+	struct client *cli;
+{
+	int cc;
+
+	cc = read(cli->fd, cli->rx_ptr, cli->rx_left);
+	if (cc <= 0) {
+		/* normal client exit condition */
+		output_line("*** Client program disconnected");
+close_socket:	cli->rx_state = 2;
+		return;
+	}
+	cli->rx_ptr += cc;
+	cli->rx_left -= cc;
+	if (cli->rx_left)
+		return;
+	/* got the thing, process it */
+	if (cli->rx_state) {
+		prep_for_length_rx(cli);
+		process_msg_from_client(cli);
+	} else {
+		cli->rx_msglen = cli->rx_buf[0] << 8 | cli->rx_buf[1];
+		if (cli->rx_msglen < 1 || cli->rx_msglen > LOCALSOCK_MAX_MSG) {
+			send_local_msg_to_client(cli,
+					"-Invalid length, closing socket");
+			goto close_socket;
+		}
+		prep_for_message_rx(cli);
+	}
+}