diff options
Diffstat (limited to 'source4/lib/socket/netif.c')
| -rw-r--r-- | source4/lib/socket/netif.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/source4/lib/socket/netif.c b/source4/lib/socket/netif.c new file mode 100644 index 0000000000..bf410af441 --- /dev/null +++ b/source4/lib/socket/netif.c @@ -0,0 +1,126 @@ +/* + Unix SMB/CIFS implementation. + return a list of network interfaces + Copyright (C) Andrew Tridgell 1998 + Copyright (C) Jeremy Allison 2007 + Copyright (C) Jelmer Vernooij 2007 + + 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 3 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, see <http://www.gnu.org/licenses/>. +*/ + + +/* working out the interfaces for a OS is an incredibly non-portable + thing. We have several possible implementations below, and autoconf + tries each of them to see what works + + Note that this file does _not_ include includes.h. That is so this code + can be called directly from the autoconf tests. That also means + this code cannot use any of the normal Samba debug stuff or defines. + This is standalone code. + +*/ + +#include "includes.h" +#include "system/network.h" +#include "netif.h" + +/**************************************************************************** + Try the "standard" getifaddrs/freeifaddrs interfaces. + Also gets IPv6 interfaces. +****************************************************************************/ + +/**************************************************************************** + Get the netmask address for a local interface. +****************************************************************************/ + +static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces) +{ + struct ifaddrs *iflist = NULL; + struct ifaddrs *ifptr = NULL; + int total = 0; + + if (getifaddrs(&iflist) < 0) { + return -1; + } + + /* Loop through interfaces, looking for given IP address */ + for (ifptr = iflist, total = 0; + ifptr != NULL && total < max_interfaces; + ifptr = ifptr->ifa_next) { + + memset(&ifaces[total], '\0', sizeof(ifaces[total])); + + if (!ifptr->ifa_addr || !ifptr->ifa_netmask) { + continue; + } + + /* Check the interface is up. */ + if (!(ifptr->ifa_flags & IFF_UP)) { + continue; + } + + /* We don't support IPv6 *yet* */ + if (ifptr->ifa_addr->sa_family != AF_INET) { + continue; + } + + ifaces[total].ip = ((struct sockaddr_in *)ifptr->ifa_addr)->sin_addr; + ifaces[total].netmask = ((struct sockaddr_in *)ifptr->ifa_netmask)->sin_addr; + + strlcpy(ifaces[total].name, ifptr->ifa_name, + sizeof(ifaces[total].name)); + total++; + } + + freeifaddrs(iflist); + + return total; +} + +static int iface_comp(struct iface_struct *i1, struct iface_struct *i2) +{ + int r; + r = strcmp(i1->name, i2->name); + if (r) return r; + r = ntohl(i1->ip.s_addr) - ntohl(i2->ip.s_addr); + if (r) return r; + r = ntohl(i1->netmask.s_addr) - ntohl(i2->netmask.s_addr); + return r; +} + +/* this wrapper is used to remove duplicates from the interface list generated + above */ +int get_interfaces(struct iface_struct *ifaces, int max_interfaces) +{ + int total, i, j; + + total = _get_interfaces(ifaces, max_interfaces); + if (total <= 0) return total; + + /* now we need to remove duplicates */ + qsort(ifaces, total, sizeof(ifaces[0]), QSORT_CAST iface_comp); + + for (i=1;i<total;) { + if (iface_comp(&ifaces[i-1], &ifaces[i]) == 0) { + for (j=i-1;j<total-1;j++) { + ifaces[j] = ifaces[j+1]; + } + total--; + } else { + i++; + } + } + + return total; +} |