[systemd-devel] [PATCH v3 12/26] dhcp: Add function for sending a raw packet
Patrik Flykt
patrik.flykt at linux.intel.com
Mon Dec 9 13:43:18 PST 2013
Open a packet socket, create a link level header, send packet and
close socket. Adding it to a separate file makes testing of the
DHCP sending much easier, as the test program can supply any socket
to the DHCP client code.
---
v3: use size_t and set buffer to const
src/dhcp/internal.h | 2 ++
src/dhcp/network.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 57 insertions(+)
create mode 100644 src/dhcp/network.c
diff --git a/src/dhcp/internal.h b/src/dhcp/internal.h
index 88e1a08..f3cde61 100644
--- a/src/dhcp/internal.h
+++ b/src/dhcp/internal.h
@@ -25,6 +25,8 @@
#include "protocol.h"
+int dhcp_network_send_raw_packet(int index, const void *packet, size_t len);
+
int dhcp_option_append(uint8_t **buf, size_t *buflen, uint8_t code,
size_t optlen, const void *optval);
diff --git a/src/dhcp/network.c b/src/dhcp/network.c
new file mode 100644
index 0000000..ce21031
--- /dev/null
+++ b/src/dhcp/network.c
@@ -0,0 +1,55 @@
+/***
+ 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 "internal.h"
+
+int dhcp_network_send_raw_packet(int index, const void *packet, size_t len)
+{
+ _cleanup_close_ int s;
+ union sockaddr_union link = {};
+
+ s = socket(AF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC, 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 (bind(s, &link.sa, sizeof(link.ll)) < 0)
+ return -errno;
+
+ if (sendto(s, packet, len, 0, &link.sa, sizeof(link.ll)) < 0)
+ return -errno;
+
+ return 0;
+}
--
1.7.10.4
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