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. --- v2: - previous 11/28 - use sockaddr_union, initialize with {}, _cleanup_close_, const - keep buflen as int, easier to check if it goes < 0 by being too short
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 328ef1c..6f414e3 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, void *packet, int len); + int dhcp_option_append(uint8_t **buf, int *buflen, uint8_t code, uint8_t optlen, const void *optval); diff --git a/src/dhcp/network.c b/src/dhcp/network.c new file mode 100644 index 0000000..3b2d2c3 --- /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, void *packet, int 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 _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel