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Diffstat (limited to 'src/libsystemd-network/dhcp-network.c')
-rw-r--r--src/libsystemd-network/dhcp-network.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/src/libsystemd-network/dhcp-network.c b/src/libsystemd-network/dhcp-network.c
new file mode 100644
index 0000000000..934e8bf13e
--- /dev/null
+++ b/src/libsystemd-network/dhcp-network.c
@@ -0,0 +1,109 @@
+/***
+ This file is part of systemd.
+
+ Copyright (C) 2013 Intel Corporation. All rights reserved.
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <string.h>
+#include <linux/if_packet.h>
+#include <net/ethernet.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "socket-util.h"
+
+#include "dhcp-internal.h"
+
+int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link)
+{
+ int s, one = 1;
+
+ assert(index > 0);
+ assert(link);
+
+ s = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
+ htons(ETH_P_IP));
+ if (s < 0)
+ return -errno;
+
+ link->ll.sll_family = AF_PACKET;
+ link->ll.sll_protocol = htons(ETH_P_IP);
+ link->ll.sll_ifindex = index;
+ link->ll.sll_halen = ETH_ALEN;
+ memset(link->ll.sll_addr, 0xff, ETH_ALEN);
+
+ if (setsockopt (s, SOL_PACKET, PACKET_AUXDATA, &one, sizeof(one)) < 0)
+ return -errno;
+
+ if (bind(s, &link->sa, sizeof(link->ll)) < 0) {
+ close_nointr_nofail(s);
+ return -errno;
+ }
+
+ return s;
+}
+
+int dhcp_network_bind_udp_socket(int index, be32_t address, uint16_t port)
+{
+ int s;
+ union sockaddr_union src = {
+ .in.sin_family = AF_INET,
+ .in.sin_port = htobe16(port),
+ .in.sin_addr.s_addr = address,
+ };
+
+ s = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
+ if (s < 0)
+ return -errno;
+
+ if (bind(s, &src.sa, sizeof(src.in)) < 0) {
+ close_nointr_nofail(s);
+ return -errno;
+ }
+
+ return s;
+}
+
+int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link,
+ const void *packet, size_t len)
+{
+ assert(link);
+ assert(packet);
+ assert(len);
+
+ if (sendto(s, packet, len, 0, &link->sa, sizeof(link->ll)) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port,
+ const void *packet, size_t len)
+{
+ union sockaddr_union dest = {
+ .in.sin_family = AF_INET,
+ .in.sin_port = htobe16(port),
+ .in.sin_addr.s_addr = address,
+ };
+
+ if (sendto(s, packet, len, 0, &dest.sa, sizeof(dest.in)) < 0)
+ return -errno;
+
+ return 0;
+}