1 | /*
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2 | * clientsocket.c -- DHCP client socket creation
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3 | *
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4 | * udhcp client
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5 | *
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6 | * Russ Dill <Russ.Dill@asu.edu> July 2001
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7 | *
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8 | * This program is free software; you can redistribute it and/or modify
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9 | * it under the terms of the GNU General Public License as published by
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10 | * the Free Software Foundation; either version 2 of the License, or
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11 | * (at your option) any later version.
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12 | *
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13 | * This program is distributed in the hope that it will be useful,
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 | * GNU General Public License for more details.
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17 | *
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18 | * You should have received a copy of the GNU General Public License
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19 | * along with this program; if not, write to the Free Software
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20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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21 | */
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22 |
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23 | #include <sys/types.h>
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24 | #include <sys/socket.h>
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25 | #include <unistd.h>
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26 | #include <netinet/in.h>
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27 | #include <features.h>
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28 | #if (__GLIBC__ >= 2 && __GLIBC_MINOR >= 1) || defined _NEWLIB_VERSION
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29 | #include <netpacket/packet.h>
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30 | #include <net/ethernet.h>
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31 | #else
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32 | #include <asm/types.h>
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33 | #include <linux/if_packet.h>
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34 | #include <linux/if_ether.h>
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35 | #endif
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36 |
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37 | #include "clientsocket.h"
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38 | #include "common.h"
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39 |
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40 |
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41 | int raw_socket(int ifindex)
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42 | {
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43 | int fd;
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44 | struct sockaddr_ll sock;
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45 |
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46 | DEBUG(LOG_INFO, "Opening raw socket on ifindex %d", ifindex);
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47 | if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
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48 | DEBUG(LOG_ERR, "socket call failed: %m");
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49 | return -1;
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50 | }
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51 |
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52 | sock.sll_family = AF_PACKET;
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53 | sock.sll_protocol = htons(ETH_P_IP);
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54 | sock.sll_ifindex = ifindex;
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55 | if (bind(fd, (struct sockaddr *) &sock, sizeof(sock)) < 0) {
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56 | DEBUG(LOG_ERR, "bind call failed: %m");
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57 | close(fd);
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58 | return -1;
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59 | }
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60 |
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61 | return fd;
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62 | }
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