contrib/fwd: initial IPC work

contrib/fwd/src/fwd_ipc.c

@@ -0,0 +1,98 @@
+/*
+ * fwd - OpenWrt firewall daemon - unix domain socket parts
+ *
+ *   Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
+ *
+ * The fwd program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * The fwd program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with the fwd program. If not, see http://www.gnu.org/licenses/.
+ */
+
+
+#include "fwd.h"
+#include "fwd_ipc.h"
+
+
+int fwd_ipc_listen(void)
+{
+	int fd;
+	struct sockaddr_un addr;
+
+	if( (fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0 )
+		fwd_fatal("Cannot create AF_UNIX socket: %m");
+
+	memset(&addr, 0, sizeof(struct sockaddr_un));
+	strcpy(addr.sun_path, FWD_SOCKET_PATH);
+	addr.sun_family = AF_UNIX;
+
+	unlink(FWD_SOCKET_PATH);
+
+	if( bind(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr_un)) < 0 )
+		fwd_fatal("Cannot bind AF_UNIX socket: %m");
+
+	if( listen(fd, 1) < 0 )
+		fwd_fatal("Cannot listen on AF_UNIX socket: %m");
+
+	//fcntl(fd, F_SETFL, O_NONBLOCK);
+
+	return fd;
+}
+
+int fwd_ipc_accept(int fd)
+{
+	return accept(fd, NULL, NULL);
+}
+
+int fwd_ipc_connect(void)
+{
+	int fd;
+	struct sockaddr_un addr;
+
+	if( (fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0 )
+		fwd_fatal("Cannot create AF_UNIX socket: %m");
+
+	memset(&addr, 0, sizeof(struct sockaddr_un));
+	strcpy(addr.sun_path, FWD_SOCKET_PATH);
+	addr.sun_family = AF_UNIX;
+
+	if( connect(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr_un)) < 0 )
+		fwd_fatal("Cannot connect AF_UNIX socket: %m");
+
+	fcntl(fd, F_SETFL, O_NONBLOCK);
+
+	return fd;
+}
+
+int fwd_ipc_recvmsg(int fd, void *buf, int len)
+{
+	return recv(fd, buf, len, 0);
+}
+
+int fwd_ipc_sendmsg(int fd, void *buf, int len)
+{
+	return send(fd, buf, len, 0);
+}
+
+void fwd_ipc_shutdown(int fd)
+{
+	shutdown(fd, SHUT_RDWR);
+	close(fd);
+}
+
+int fwd_ipc_sendtype(int fd, enum fwd_ipc_msgtype type)
+{
+	struct fwd_ipc_msg msg;
+
+	memset(&msg, 0, sizeof(struct fwd_ipc_msg));
+	msg.type = type;
+
+	return fwd_ipc_sendmsg(fd, &msg, sizeof(struct fwd_ipc_msg));
+}

contrib/fwd/src/fwd_ipc.h

@@ -0,0 +1,61 @@
+/*
+ * fwd - OpenWrt firewall daemon - unix domain socket headers
+ *
+ *   Copyright (C) 2009 Jo-Philipp Wich <xm@subsignal.org>
+ *
+ * The fwd program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * The fwd program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with the fwd program. If not, see http://www.gnu.org/licenses/.
+ */
+
+#ifndef __FWD_IPC_H__
+#define __FWD_IPC_H__
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <sys/socket.h>
+#include <sys/un.h>
+
+#define FWD_SOCKET_PATH	"/var/run/fwd.sock"
+
+
+enum fwd_ipc_msgtype {
+	FWD_IPC_OK     = 0,
+	FWD_IPC_ERROR  = 1,
+	FWD_IPC_FLUSH  = 2,
+	FWD_IPC_BUILD  = 3,
+	FWD_IPC_RELOAD = 4,
+	FWD_IPC_ADDIF  = 5,
+	FWD_IPC_DELIF  = 6
+};
+
+struct fwd_ipc_msg {
+	enum fwd_ipc_msgtype type;
+	union {
+		char network[256];
+	} data;
+};
+
+int fwd_ipc_listen(void);
+int fwd_ipc_accept(int);
+
+int fwd_ipc_connect(void);
+
+int fwd_ipc_recvmsg(int, void *, int);
+int fwd_ipc_sendmsg(int, void *, int);
+
+void fwd_ipc_shutdown(int);
+
+int fwd_ipc_sendtype(int, enum fwd_ipc_msgtype);
+
+#endif