move common code of system_linux.c and system_aix.c into new system_common.c

Michael

(This used to be ctdb commit 124874847e5e03ce2a44bddfe778f01dfb0a7a03)

1 files changed, 72 insertions, 0 deletions

diff --git a/ctdb/common/system_common.c b/ctdb/common/system_common.c
new file mode 100644
index 00000000000..9aa4620bd82
--- /dev/null
+++ b/ctdb/common/system_common.c
@@ -0,0 +1,72 @@
+/* 
+   ctdb system specific code to manage raw sockets on linux
+
+   Copyright (C) Ronnie Sahlberg  2007
+   Copyright (C) Andrew Tridgell  2007
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This 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 this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "system/network.h"
+
+/*
+  uint16 checksum for n bytes
+ */
+uint32_t uint16_checksum(uint16_t *data, size_t n)
+{
+	uint32_t sum=0;
+	while (n>=2) {
+		sum += (uint32_t)ntohs(*data);
+		data++;
+		n -= 2;
+	}
+	if (n == 1) {
+		sum += (uint32_t)ntohs(*(uint8_t *)data);
+	}
+	return sum;
+}
+
+/*
+  see if we currently have an interface with the given IP
+
+  we try to bind to it, and if that fails then we don't have that IP
+  on an interface
+ */
+bool ctdb_sys_have_ip(ctdb_sock_addr *_addr)
+{
+	int s;
+	int ret;
+	ctdb_sock_addr __addr = *_addr;
+	ctdb_sock_addr *addr = &__addr;
+
+	switch (addr->sa.sa_family) {
+	case AF_INET:
+		addr->ip.sin_port = 0;
+		break;
+	case AF_INET6:
+		addr->ip6.sin6_port = 0;
+		break;
+	}
+
+	s = socket(addr->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
+	if (s == -1) {
+		return false;
+	}
+
+	ret = bind(s, (struct sockaddr *)addr, sizeof(ctdb_sock_addr));
+
+	close(s);
+	return ret == 0;
+}