158 lines
4.1 KiB
C
Executable File
158 lines
4.1 KiB
C
Executable File
/*
|
|
* socket.c -- DHCP server client/server socket creation
|
|
*
|
|
* udhcp client/server
|
|
* Copyright (C) 1999 Matthew Ramsay <matthewr@moreton.com.au>
|
|
* Chris Trew <ctrew@moreton.com.au>
|
|
*
|
|
* Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/ioctl.h>
|
|
#include <netinet/in.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <arpa/inet.h>
|
|
#include <net/if.h>
|
|
#include <errno.h>
|
|
#include <features.h>
|
|
#if __GLIBC__ >=2 && __GLIBC_MINOR >= 1
|
|
#include <netpacket/packet.h>
|
|
#include <net/ethernet.h>
|
|
#else
|
|
#include <asm/types.h>
|
|
#include <linux/if_packet.h>
|
|
#include <linux/if_ether.h>
|
|
#endif
|
|
|
|
#include "debug.h"
|
|
|
|
int read_interface(char *interface, int *ifindex, u_int32_t *addr, unsigned char *arp)
|
|
{
|
|
int fd;
|
|
struct ifreq ifr;
|
|
struct sockaddr_in *our_ip;
|
|
|
|
memset(&ifr, 0, sizeof(struct ifreq));
|
|
if((fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) >= 0) {
|
|
ifr.ifr_addr.sa_family = AF_INET;
|
|
strcpy(ifr.ifr_name, interface);
|
|
|
|
if (addr) {
|
|
if (ioctl(fd, SIOCGIFADDR, &ifr) == 0) {
|
|
our_ip = (struct sockaddr_in *) &ifr.ifr_addr;
|
|
*addr = our_ip->sin_addr.s_addr;
|
|
DEBUG(LOG_INFO, "%s (our ip) = %s", ifr.ifr_name, inet_ntoa(our_ip->sin_addr));
|
|
} else {
|
|
LOG(LOG_ERR, "SIOCGIFADDR failed, is the interface up and configured?: %s",
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (ioctl(fd, SIOCGIFINDEX, &ifr) == 0) {
|
|
DEBUG(LOG_INFO, "adapter index %d", ifr.ifr_ifindex);
|
|
*ifindex = ifr.ifr_ifindex;
|
|
} else {
|
|
LOG(LOG_ERR, "SIOCGIFINDEX failed!: %s", strerror(errno));
|
|
return -1;
|
|
}
|
|
if (ioctl(fd, SIOCGIFHWADDR, &ifr) == 0) {
|
|
memcpy(arp, ifr.ifr_hwaddr.sa_data, 6);
|
|
DEBUG(LOG_INFO, "adapter hardware address %02x:%02x:%02x:%02x:%02x:%02x",
|
|
arp[0], arp[1], arp[2], arp[3], arp[4], arp[5]);
|
|
} else {
|
|
LOG(LOG_ERR, "SIOCGIFHWADDR failed!: %s", strerror(errno));
|
|
return -1;
|
|
}
|
|
} else {
|
|
LOG(LOG_ERR, "socket failed!: %s", strerror(errno));
|
|
return -1;
|
|
}
|
|
close(fd);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int listen_socket(unsigned int ip, int port, char *inf)
|
|
{
|
|
struct ifreq interface;
|
|
int fd;
|
|
struct sockaddr_in addr;
|
|
int n = 1;
|
|
|
|
DEBUG(LOG_INFO, "Opening listen socket on 0x%08x:%d %s\n", ip, port, inf);
|
|
if ((fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
|
|
DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
addr.sin_family = AF_INET;
|
|
addr.sin_port = htons(port);
|
|
addr.sin_addr.s_addr = ip;
|
|
|
|
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &n, sizeof(n)) == -1) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (char *) &n, sizeof(n)) == -1) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
strncpy(interface.ifr_ifrn.ifrn_name, inf, IFNAMSIZ);
|
|
if (setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE,(char *)&interface, sizeof(interface)) < 0) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
if (bind(fd, (struct sockaddr *)&addr, sizeof(struct sockaddr)) == -1) {
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
|
|
int raw_socket(int ifindex)
|
|
{
|
|
int fd;
|
|
struct sockaddr_ll sock;
|
|
|
|
DEBUG(LOG_INFO, "Opening raw socket on ifindex %d\n", ifindex);
|
|
if ((fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP))) < 0) {
|
|
DEBUG(LOG_ERR, "socket call failed: %s", strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
sock.sll_family = AF_PACKET;
|
|
sock.sll_protocol = htons(ETH_P_IP);
|
|
sock.sll_ifindex = ifindex;
|
|
if (bind(fd, (struct sockaddr *) &sock, sizeof(sock)) < 0) {
|
|
DEBUG(LOG_ERR, "bind call failed: %s", strerror(errno));
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|