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authorPatrik Flykt <patrik.flykt@linux.intel.com>2013-12-09 23:43:18 +0200
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2013-12-12 11:43:34 -0500
commit8b4a96932de0c56048fbd7f7386090dc202704f7 (patch)
tree8cb7e76f11816a4dd885d72e2ec9c87069bebfed /src
parente88bc7958c02305968f2d22dd4455b50fbf911f0 (diff)
dhcp: Add function for sending a raw packet
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.
Diffstat (limited to 'src')
-rw-r--r--src/libsystemd-dhcp/dhcp-internal.h2
-rw-r--r--src/libsystemd-dhcp/dhcp-network.c55
2 files changed, 57 insertions, 0 deletions
diff --git a/src/libsystemd-dhcp/dhcp-internal.h b/src/libsystemd-dhcp/dhcp-internal.h
index 1f9c9d249b..814a3cdf64 100644
--- a/src/libsystemd-dhcp/dhcp-internal.h
+++ b/src/libsystemd-dhcp/dhcp-internal.h
@@ -25,6 +25,8 @@
#include "dhcp-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/libsystemd-dhcp/dhcp-network.c b/src/libsystemd-dhcp/dhcp-network.c
new file mode 100644
index 0000000000..ed34228f67
--- /dev/null
+++ b/src/libsystemd-dhcp/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 "dhcp-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;
+}