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skarg
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/*####COPYRIGHTBEGIN####
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-------------------------------------------
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Copyright (C) 2005 Steve Karg
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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The Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA.
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As a special exception, if other files instantiate templates or
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use macros or inline functions from this file, or you compile
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this file and link it with other works to produce a work based
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on this file, this file does not by itself cause the resulting
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work to be covered by the GNU General Public License. However
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the source code for this file must still be made available in
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accordance with section (3) of the GNU General Public License.
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This exception does not invalidate any other reasons why a work
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based on this file might be covered by the GNU General Public
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License.
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-------------------------------------------
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####COPYRIGHTEND####*/
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#include <stdint.h> /* for standard integer types uint8_t etc. */
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#include <stdbool.h> /* for the standard bool type. */
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#include "bacdcode.h"
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#include "bip.h"
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#include "net.h"
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static int get_local_ifr_ioctl(char *ifname, struct ifreq *ifr,
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int request)
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{
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int fd;
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int rv; /* return value */
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strncpy(ifr->ifr_name, ifname, sizeof(ifr->ifr_name));
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fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
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if (fd < 0)
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rv = fd;
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else
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rv = ioctl(fd, request, ifr);
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return rv;
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}
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static int get_local_address_ioctl(char *ifname,
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struct in_addr *addr, int request)
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{
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struct ifreq ifr = { {{0}} };
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struct sockaddr_in *tcpip_address;
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int rv; /* return value */
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rv = get_local_ifr_ioctl(ifname, &ifr, request);
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if (rv >= 0) {
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tcpip_address = (struct sockaddr_in *) &ifr.ifr_addr;
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memcpy(addr, &tcpip_address->sin_addr, sizeof(struct in_addr));
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}
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return rv;
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}
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/* on Linux, ifname is eth0, ath0, arc0, and others. */
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static void bip_set_interface(char *ifname)
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{
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struct in_addr local_address;
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struct in_addr broadcast_address;
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/* setup local address */
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get_local_address_ioctl(ifname, &local_address, SIOCGIFADDR);
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bip_set_addr(local_address.s_addr);
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#ifdef BIP_DEBUG
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fprintf(stderr, "Interface: %s\n", ifname);
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fprintf(stderr, "IP Address: %s\n", inet_ntoa(local_address));
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#endif
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/* setup local broadcast address */
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get_local_address_ioctl(ifname, &broadcast_address, SIOCGIFBRDADDR);
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bip_set_broadcast_addr(broadcast_address.s_addr);
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#ifdef BIP_DEBUG
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fprintf(stderr, "IP Broadcast Address: %s\n",
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inet_ntoa(broadcast_address));
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fprintf(stderr, "UDP Port: 0x%04X [%hu]\n",
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bip_get_port(),
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bip_get_port());
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#endif
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}
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bool bip_init(char *ifname)
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{
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int status = 0; /* return from socket lib calls */
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struct sockaddr_in sin;
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int sockopt = 0;
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int sock_fd = -1;
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if (ifname)
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bip_set_interface(ifname);
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else
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bip_set_interface("eth0");
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/* assumes that the driver has already been initialized */
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sock_fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
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bip_set_socket(sock_fd);
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if (sock_fd < 0)
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return false;
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/* Allow us to use the same socket for sending and receiving */
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/* This makes sure that the src port is correct when sending */
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sockopt = 1;
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status = setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR,
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&sockopt, sizeof(sockopt));
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if (status < 0) {
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close(sock_fd);
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bip_set_socket(-1);
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return status;
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}
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/* allow us to send a broadcast */
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status = setsockopt(sock_fd, SOL_SOCKET, SO_BROADCAST,
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&sockopt, sizeof(sockopt));
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if (status < 0) {
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close(sock_fd);
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bip_set_socket(-1);
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return status;
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}
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/* bind the socket to the local port number and IP address */
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = htonl(INADDR_ANY);
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sin.sin_port = htons(bip_get_port());
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memset(&(sin.sin_zero), '\0', sizeof(sin.sin_zero));
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status = bind(sock_fd,
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(const struct sockaddr *) &sin, sizeof(struct sockaddr));
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if (status < 0) {
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close(sock_fd);
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bip_set_socket(-1);
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return false;
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}
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return true;
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}
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