mirror of
https://github.com/pi-hole/dnsmasq.git
synced 2025-12-19 02:08:24 +00:00
Fix possible SIGSEGV in bpf.c
This commit is contained in:
Simon Kelley
178
src/bpf.c
178
src/bpf.c
@@ -126,112 +126,110 @@ int iface_enumerate(int family, void *parm, callback_t callback)
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for (addrs = head; addrs; addrs = addrs->ifa_next)
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{
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if (addrs->ifa_addr->sa_family == family)
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int iface_index = if_nametoindex(addrs->ifa_name);
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if (iface_index == 0 || !addrs->ifa_addr ||
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addrs->ifa_addr->sa_family != family ||
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(!addrs->ifa_netmask && family != AF_LINK))
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continue;
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if (family == AF_INET)
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{
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int iface_index = if_nametoindex(addrs->ifa_name);
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if (iface_index == 0 || !addrs->ifa_addr ||
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(!addrs->ifa_netmask && family != AF_LINK))
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struct in_addr addr, netmask, broadcast;
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addr = ((struct sockaddr_in *) addrs->ifa_addr)->sin_addr;
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#ifdef HAVE_BSD_NETWORK
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if (del_family == AF_INET && del_addr.addr4.s_addr == addr.s_addr)
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continue;
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if (family == AF_INET)
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{
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struct in_addr addr, netmask, broadcast;
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addr = ((struct sockaddr_in *) addrs->ifa_addr)->sin_addr;
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#ifdef HAVE_BSD_NETWORK
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if (del_family == AF_INET && del_addr.addr4.s_addr == addr.s_addr)
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continue;
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#endif
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netmask = ((struct sockaddr_in *) addrs->ifa_netmask)->sin_addr;
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if (addrs->ifa_broadaddr)
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broadcast = ((struct sockaddr_in *) addrs->ifa_broadaddr)->sin_addr;
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else
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broadcast.s_addr = 0;
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if (!callback.af_inet(addr, iface_index, NULL, netmask, broadcast, parm))
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goto err;
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}
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else if (family == AF_INET6)
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{
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struct in6_addr *addr = &((struct sockaddr_in6 *) addrs->ifa_addr)->sin6_addr;
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unsigned char *netmask = (unsigned char *) &((struct sockaddr_in6 *) addrs->ifa_netmask)->sin6_addr;
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int scope_id = ((struct sockaddr_in6 *) addrs->ifa_addr)->sin6_scope_id;
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int i, j, prefix = 0;
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u32 valid = 0xffffffff, preferred = 0xffffffff;
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int flags = 0;
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netmask = ((struct sockaddr_in *) addrs->ifa_netmask)->sin_addr;
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if (addrs->ifa_broadaddr)
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broadcast = ((struct sockaddr_in *) addrs->ifa_broadaddr)->sin_addr;
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else
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broadcast.s_addr = 0;
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if (!callback.af_inet(addr, iface_index, NULL, netmask, broadcast, parm))
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goto err;
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}
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else if (family == AF_INET6)
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{
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struct in6_addr *addr = &((struct sockaddr_in6 *) addrs->ifa_addr)->sin6_addr;
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unsigned char *netmask = (unsigned char *) &((struct sockaddr_in6 *) addrs->ifa_netmask)->sin6_addr;
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int scope_id = ((struct sockaddr_in6 *) addrs->ifa_addr)->sin6_scope_id;
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int i, j, prefix = 0;
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u32 valid = 0xffffffff, preferred = 0xffffffff;
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int flags = 0;
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#ifdef HAVE_BSD_NETWORK
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if (del_family == AF_INET6 && IN6_ARE_ADDR_EQUAL(&del_addr.addr6, addr))
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continue;
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if (del_family == AF_INET6 && IN6_ARE_ADDR_EQUAL(&del_addr.addr6, addr))
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continue;
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#endif
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#if defined(HAVE_BSD_NETWORK) && !defined(__APPLE__)
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struct in6_ifreq ifr6;
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memset(&ifr6, 0, sizeof(ifr6));
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safe_strncpy(ifr6.ifr_name, addrs->ifa_name, sizeof(ifr6.ifr_name));
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struct in6_ifreq ifr6;
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memset(&ifr6, 0, sizeof(ifr6));
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safe_strncpy(ifr6.ifr_name, addrs->ifa_name, sizeof(ifr6.ifr_name));
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ifr6.ifr_addr = *((struct sockaddr_in6 *) addrs->ifa_addr);
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if (fd != -1 && ioctl(fd, SIOCGIFAFLAG_IN6, &ifr6) != -1)
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{
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if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_TENTATIVE)
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flags |= IFACE_TENTATIVE;
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if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DEPRECATED)
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flags |= IFACE_DEPRECATED;
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ifr6.ifr_addr = *((struct sockaddr_in6 *) addrs->ifa_addr);
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if (fd != -1 && ioctl(fd, SIOCGIFAFLAG_IN6, &ifr6) != -1)
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{
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if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_TENTATIVE)
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flags |= IFACE_TENTATIVE;
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if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DEPRECATED)
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flags |= IFACE_DEPRECATED;
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#ifdef IN6_IFF_TEMPORARY
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if (!(ifr6.ifr_ifru.ifru_flags6 & (IN6_IFF_AUTOCONF | IN6_IFF_TEMPORARY)))
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flags |= IFACE_PERMANENT;
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if (!(ifr6.ifr_ifru.ifru_flags6 & (IN6_IFF_AUTOCONF | IN6_IFF_TEMPORARY)))
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flags |= IFACE_PERMANENT;
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#endif
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#ifdef IN6_IFF_PRIVACY
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if (!(ifr6.ifr_ifru.ifru_flags6 & (IN6_IFF_AUTOCONF | IN6_IFF_PRIVACY)))
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flags |= IFACE_PERMANENT;
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if (!(ifr6.ifr_ifru.ifru_flags6 & (IN6_IFF_AUTOCONF | IN6_IFF_PRIVACY)))
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flags |= IFACE_PERMANENT;
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#endif
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}
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ifr6.ifr_addr = *((struct sockaddr_in6 *) addrs->ifa_addr);
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if (fd != -1 && ioctl(fd, SIOCGIFALIFETIME_IN6, &ifr6) != -1)
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{
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valid = ifr6.ifr_ifru.ifru_lifetime.ia6t_vltime;
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preferred = ifr6.ifr_ifru.ifru_lifetime.ia6t_pltime;
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}
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}
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ifr6.ifr_addr = *((struct sockaddr_in6 *) addrs->ifa_addr);
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if (fd != -1 && ioctl(fd, SIOCGIFALIFETIME_IN6, &ifr6) != -1)
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{
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valid = ifr6.ifr_ifru.ifru_lifetime.ia6t_vltime;
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preferred = ifr6.ifr_ifru.ifru_lifetime.ia6t_pltime;
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}
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#endif
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for (i = 0; i < IN6ADDRSZ; i++, prefix += 8)
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if (netmask[i] != 0xff)
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break;
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if (i != IN6ADDRSZ && netmask[i])
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for (j = 7; j > 0; j--, prefix++)
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if ((netmask[i] & (1 << j)) == 0)
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break;
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/* voodoo to clear interface field in address */
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if (!option_bool(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 (!callback.af_inet6(addr, prefix, scope_id, iface_index, flags,
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(unsigned int) preferred, (unsigned int)valid, parm))
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goto err;
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}
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#ifdef HAVE_DHCP6
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else if (family == AF_LINK)
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{
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/* Assume ethernet again here */
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struct sockaddr_dl *sdl = (struct sockaddr_dl *) addrs->ifa_addr;
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if (sdl->sdl_alen != 0 &&
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!callback.af_local(iface_index, ARPHRD_ETHER, LLADDR(sdl), sdl->sdl_alen, parm))
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goto err;
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}
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#endif
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for (i = 0; i < IN6ADDRSZ; i++, prefix += 8)
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if (netmask[i] != 0xff)
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break;
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if (i != IN6ADDRSZ && netmask[i])
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for (j = 7; j > 0; j--, prefix++)
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if ((netmask[i] & (1 << j)) == 0)
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break;
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/* voodoo to clear interface field in address */
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if (!option_bool(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 (!callback.af_inet6(addr, prefix, scope_id, iface_index, flags,
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(unsigned int) preferred, (unsigned int)valid, parm))
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goto err;
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}
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#ifdef HAVE_DHCP6
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else if (family == AF_LINK)
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{
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/* Assume ethernet again here */
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struct sockaddr_dl *sdl = (struct sockaddr_dl *) addrs->ifa_addr;
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if (sdl->sdl_alen != 0 &&
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!callback.af_local(iface_index, ARPHRD_ETHER, LLADDR(sdl), sdl->sdl_alen, 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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errsave = errno;
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freeifaddrs(head);
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