mirror of
https://github.com/pi-hole/dnsmasq.git
synced 2025-12-19 10:18:25 +00:00
import of dnsmasq-2.41.tar.gz
This commit is contained in:
Simon Kelley
215
src/bpf.c
215
src/bpf.c
@@ -1,20 +1,22 @@
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/* dnsmasq is Copyright (c) 2000-2006 Simon Kelley
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/* dnsmasq is Copyright (c) 2000-2007 Simon Kelley
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 dated June, 1991.
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the Free Software Foundation; version 2 dated June, 1991, or
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(at your option) version 3 dated 29 June, 2007.
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include "dnsmasq.h"
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#ifndef HAVE_LINUX_NETWORK
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#include <net/bpf.h>
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#if defined(HAVE_BSD_NETWORK) || defined(HAVE_SOLARIS_NETWORK)
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static struct iovec ifconf = {
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.iov_base = NULL,
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@@ -26,6 +28,107 @@ static struct iovec ifreq = {
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.iov_len = 0
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};
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int iface_enumerate(void *parm, int (*ipv4_callback)(), int (*ipv6_callback)())
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{
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char *ptr;
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struct ifreq *ifr;
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struct ifconf ifc;
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int fd, errsav, ret = 0;
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int lastlen = 0;
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size_t len = 0;
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if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
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return 0;
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while(1)
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{
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len += 10*sizeof(struct ifreq);
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if (!expand_buf(&ifconf, len))
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goto err;
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ifc.ifc_len = len;
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ifc.ifc_buf = ifconf.iov_base;
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if (ioctl(fd, SIOCGIFCONF, &ifc) == -1)
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{
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if (errno != EINVAL || lastlen != 0)
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goto err;
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}
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else
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{
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if (ifc.ifc_len == lastlen)
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break; /* got a big enough buffer now */
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lastlen = ifc.ifc_len;
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}
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}
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for (ptr = ifc.ifc_buf; ptr < ifc.ifc_buf + ifc.ifc_len; ptr += len )
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{
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/* subsequent entries may not be aligned, so copy into
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an aligned buffer to avoid nasty complaints about
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unaligned accesses. */
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#ifdef HAVE_SOCKADDR_SA_LEN
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len = ((struct ifreq *)ptr)->ifr_addr.sa_len + IF_NAMESIZE;
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#else
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len = sizeof(struct ifreq);
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#endif
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if (!expand_buf(&ifreq, len))
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goto err;
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ifr = (struct ifreq *)ifreq.iov_base;
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memcpy(ifr, ptr, len);
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if (ifr->ifr_addr.sa_family == AF_INET && ipv4_callback)
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{
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struct in_addr addr, netmask, broadcast;
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broadcast.s_addr = 0;
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addr = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr;
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if (ioctl(fd, SIOCGIFNETMASK, ifr) == -1)
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continue;
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netmask = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr;
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if (ioctl(fd, SIOCGIFBRDADDR, ifr) != -1)
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broadcast = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr;
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if (!((*ipv4_callback)(addr,
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(int)if_nametoindex(ifr->ifr_name),
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netmask, broadcast,
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parm)))
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goto err;
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}
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#ifdef HAVE_IPV6
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else if (ifr->ifr_addr.sa_family == AF_INET6 && ipv6_callback)
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{
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struct in6_addr *addr = &((struct sockaddr_in6 *)&ifr->ifr_addr)->sin6_addr;
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/* voodoo to clear interface field in address */
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if (!(daemon->options & OPT_NOWILD) && IN6_IS_ADDR_LINKLOCAL(addr))
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{
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addr->s6_addr[2] = 0;
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addr->s6_addr[3] = 0;
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}
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if (!((*ipv6_callback)(addr,
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(int)((struct sockaddr_in6 *)&ifr->ifr_addr)->sin6_scope_id,
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(int)if_nametoindex(ifr->ifr_name),
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parm)))
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goto err;
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}
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#endif
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}
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ret = 1;
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err:
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errsav = errno;
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close(fd);
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errno = errsav;
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return ret;
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}
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#endif
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#if defined(HAVE_BSD_NETWORK)
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#include <net/bpf.h>
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void init_bpf(void)
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{
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int i = 0;
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@@ -116,8 +219,10 @@ void send_via_bpf(struct dhcp_packet *mess, size_t len,
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udp.uh_sum = 0;
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udp.uh_ulen = sum = htons(sizeof(struct udphdr) + len);
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sum += htons(IPPROTO_UDP);
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for (i = 0; i < 4; i++)
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sum += ((u16 *)&ip.ip_src)[i];
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sum += ip.ip_src.s_addr & 0xffff;
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sum += (ip.ip_src.s_addr >> 16) & 0xffff;
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sum += ip.ip_dst.s_addr & 0xffff;
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sum += (ip.ip_dst.s_addr >> 16) & 0xffff;
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for (i = 0; i < sizeof(struct udphdr)/2; i++)
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sum += ((u16 *)&udp)[i];
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for (i = 0; i < (len + 1) / 2; i++)
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@@ -140,100 +245,6 @@ void send_via_bpf(struct dhcp_packet *mess, size_t len,
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while (writev(daemon->dhcp_raw_fd, iov, 4) == -1 && retry_send());
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}
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int iface_enumerate(void *parm, int (*ipv4_callback)(), int (*ipv6_callback)())
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{
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char *ptr;
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struct ifreq *ifr;
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struct ifconf ifc;
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int fd, errsav, ret = 0;
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int lastlen = 0;
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size_t len = 0;
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if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
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return 0;
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while(1)
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{
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len += 10*sizeof(struct ifreq);
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if (!expand_buf(&ifconf, len))
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goto err;
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ifc.ifc_len = len;
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ifc.ifc_buf = ifconf.iov_base;
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if (ioctl(fd, SIOCGIFCONF, &ifc) == -1)
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{
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if (errno != EINVAL || lastlen != 0)
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goto err;
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}
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else
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{
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if (ifc.ifc_len == lastlen)
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break; /* got a big enough buffer now */
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lastlen = ifc.ifc_len;
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}
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}
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for (ptr = ifc.ifc_buf; ptr < ifc.ifc_buf + ifc.ifc_len; ptr += len )
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{
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/* subsequent entries may not be aligned, so copy into
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an aligned buffer to avoid nasty complaints about
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unaligned accesses. */
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#ifdef HAVE_SOCKADDR_SA_LEN
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len = ((struct ifreq *)ptr)->ifr_addr.sa_len + IF_NAMESIZE;
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#else
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len = sizeof(struct ifreq);
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#endif
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if (!expand_buf(&ifreq, len))
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goto err;
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ifr = ifreq.iov_base;
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memcpy(ifr, ptr, len);
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if (ifr->ifr_addr.sa_family == AF_INET && ipv4_callback)
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{
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struct in_addr addr, netmask, broadcast;
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broadcast.s_addr = 0;
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addr = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr;
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if (ioctl(fd, SIOCGIFNETMASK, ifr) == -1)
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continue;
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netmask = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr;
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if (ioctl(fd, SIOCGIFBRDADDR, ifr) != -1)
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broadcast = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr;
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if (!((*ipv4_callback)(addr,
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(int)if_nametoindex(ifr->ifr_name),
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netmask, broadcast,
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parm)))
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goto err;
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}
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#ifdef HAVE_IPV6
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else if (ifr->ifr_addr.sa_family == AF_INET6 && ipv6_callback)
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{
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struct in6_addr *addr = &((struct sockaddr_in6 *)&ifr->ifr_addr)->sin6_addr;
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/* voodoo to clear interface field in address */
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if (!(daemon->options & OPT_NOWILD) && IN6_IS_ADDR_LINKLOCAL(addr))
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{
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addr->s6_addr[2] = 0;
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addr->s6_addr[3] = 0;
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}
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if (!((*ipv6_callback)(addr,
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(int)((struct sockaddr_in6 *)&ifr->ifr_addr)->sin6_scope_id,
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(int)if_nametoindex(ifr->ifr_name),
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parm)))
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goto err;
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}
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#endif
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}
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ret = 1;
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err:
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errsav = errno;
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close(fd);
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errno = errsav;
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return ret;
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}
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#endif
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