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-rw-r--r--source3/lib/netmask.c351
1 files changed, 351 insertions, 0 deletions
diff --git a/source3/lib/netmask.c b/source3/lib/netmask.c
new file mode 100644
index 00000000000..138a4413f10
--- /dev/null
+++ b/source3/lib/netmask.c
@@ -0,0 +1,351 @@
+/*
+ Unix SMB/Netbios implementation.
+ Version 1.9.
+ code to query kernel netmask
+ Copyright (C) Andrew Tridgell 1998
+
+ 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.
+*/
+
+
+/* working out the netmask for an interface 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.
+
+*/
+
+#ifndef AUTOCONF
+#include "config.h"
+#endif
+
+#ifdef HAVE_NETMASK_IFCONF
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+
+#ifndef SIOCGIFCONF
+#include <sys/sockio.h>
+#endif
+
+
+/****************************************************************************
+ get the netmask address for a local interface
+****************************************************************************/
+int get_netmask(struct in_addr *ipaddr, struct in_addr *nmask)
+{
+ struct ifconf ifc;
+ char buff[2048];
+ int fd, i, n;
+ struct ifreq *ifr=NULL;
+
+ if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
+#ifdef DEBUG
+ fprintf(stderr,"socket failed\n");
+#endif
+ return -1;
+ }
+
+ ifc.ifc_len = sizeof(buff);
+ ifc.ifc_buf = buff;
+ if (ioctl(fd, SIOCGIFCONF, &ifc) != 0) {
+#ifdef DEBUG
+ fprintf(stderr,"SIOCGIFCONF failed\n");
+#endif
+ close(fd);
+ return -1;
+ }
+
+ ifr = ifc.ifc_req;
+
+ n = ifc.ifc_len / sizeof(struct ifreq);
+
+#ifdef DEBUG
+ fprintf(stderr,"%d interfaces - looking for %s\n",
+ n, inet_ntoa(*ipaddr));
+#endif
+
+ /* Loop through interfaces, looking for given IP address */
+ for (i=n-1;i>=0;i--) {
+ if (ioctl(fd, SIOCGIFADDR, &ifr[i]) != 0) {
+#ifdef DEBUG
+ fprintf(stderr,"SIOCGIFADDR failed\n");
+#endif
+ continue;
+ }
+
+#ifdef DEBUG
+ fprintf(stderr,"interface %s\n",
+ inet_ntoa((*(struct sockaddr_in *)&ifr[i].ifr_addr).sin_addr));
+#endif
+ if (ipaddr->s_addr !=
+ (*(struct sockaddr_in *)&ifr[i].ifr_addr).sin_addr.s_addr) {
+ continue;
+ }
+
+ if (ioctl(fd, SIOCGIFNETMASK, &ifr[i]) != 0) {
+#ifdef DEBUG
+ fprintf(stderr,"SIOCGIFNETMASK failed\n");
+#endif
+ close(fd);
+ return -1;
+ }
+ close(fd);
+ (*nmask) = ((struct sockaddr_in *)&ifr[i].ifr_addr)->sin_addr;
+#ifdef DEBUG
+ fprintf(stderr,"netmask %s\n", inet_ntoa(*nmask));
+#endif
+ return 0;
+ }
+
+#ifdef DEBUG
+ fprintf(stderr,"interface not found\n");
+#endif
+
+ close(fd);
+ return -1;
+}
+
+#elif defined(HAVE_NETMASK_IFREQ)
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+
+#ifndef SIOCGIFCONF
+#include <sys/sockio.h>
+#endif
+
+#ifndef I_STR
+#include <sys/stropts.h>
+#endif
+
+
+/****************************************************************************
+this should cover most of the rest of systems
+****************************************************************************/
+ int get_netmask(struct in_addr *ipaddr, struct in_addr *nmask)
+{
+ struct ifreq ifreq;
+ struct strioctl strioctl;
+ struct ifconf *ifc;
+ char buff[2048];
+ int fd, i, n;
+ struct ifreq *ifr=NULL;
+
+ if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
+#ifdef DEBUG
+ fprintf(stderr,"socket failed\n");
+#endif
+ return -1;
+ }
+
+ ifc = (struct ifconf *)buff;
+ ifc->ifc_len = BUFSIZ - sizeof(struct ifconf);
+ strioctl.ic_cmd = SIOCGIFCONF;
+ strioctl.ic_dp = (char *)ifc;
+ strioctl.ic_len = sizeof(buff);
+ if (ioctl(fd, I_STR, &strioctl) < 0) {
+#ifdef DEBUG
+ fprintf(stderr,"SIOCGIFCONF failed\n");
+#endif
+ close(fd);
+ return -1;
+ }
+
+ ifr = (struct ifreq *)ifc->ifc_req;
+
+ /* Loop through interfaces, looking for given IP address */
+ n = ifc->ifc_len / sizeof(struct ifreq);
+
+ for (i = 0; i<n; i++, ifr++) {
+#ifdef DEBUG
+ fprintf(stderr,"interface %s\n",
+ inet_ntoa((*(struct sockaddr_in *)&ifr->ifr_addr).sin_addr.s_addr));
+#endif
+ if (ipaddr->s_addr ==
+ (*(struct sockaddr_in *) &ifr->ifr_addr).sin_addr.s_addr) {
+ break;
+ }
+ }
+
+#ifdef DEBUG
+ if (i == n) {
+ fprintf(stderr,"interface not found\n");
+ close(fd);
+ return -1;
+ }
+#endif
+
+ ifreq = *ifr;
+
+ strioctl.ic_cmd = SIOCGIFNETMASK;
+ strioctl.ic_dp = (char *)&ifreq;
+ strioctl.ic_len = sizeof(struct ifreq);
+ if (ioctl(fd, I_STR, &strioctl) != 0) {
+#ifdef DEBUG
+ fprintf(stderr,"Failed SIOCGIFNETMASK\n");
+#endif
+ close(fd);
+ return -1;
+ }
+
+ close(fd);
+ *nmask = ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr;
+#ifdef DEBUG
+ fprintf(stderr,"netmask %s\n", inet_ntoa(*nmask));
+#endif
+ return 0;
+}
+
+#elif defined(HAVE_NETMASK_AIX)
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+
+#ifndef SIOCGIFCONF
+#include <sys/sockio.h>
+#endif
+
+/****************************************************************************
+this one is for AIX
+****************************************************************************/
+ int get_netmask(struct in_addr *ipaddr, struct in_addr *nmask)
+{
+ char buff[2048];
+ int fd, i, n;
+ struct ifconf ifc;
+ struct ifreq *ifr=NULL;
+
+ if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
+#ifdef DEBUG
+ fprintf(stderr,"socket failed\n");
+#endif
+ return -1;
+ }
+
+
+ ifc.ifc_len = sizeof(buff);
+ ifc.ifc_buf = buff;
+
+ if (ioctl(fd, SIOCGIFCONF, &ifc) != 0) {
+#ifdef DEBUG
+ fprintf(stderr,"SIOCGIFCONF failed\n");
+#endif
+ close(fd);
+ return -1;
+ }
+
+ ifr = ifc.ifc_req;
+ /* Loop through interfaces, looking for given IP address */
+ i = ifc.ifc_len;
+ while (i > 0) {
+#ifdef DEBUG
+ fprintf(stderr,"interface %s\n",
+ inet_ntoa((*(struct sockaddr_in *)&ifr->ifr_addr).sin_addr));
+#endif
+ if (ipaddr->s_addr ==
+ (*(struct sockaddr_in *) &ifr->ifr_addr).sin_addr.s_addr) {
+ break;
+ }
+ i -= ifr->ifr_addr.sa_len + IFNAMSIZ;
+ ifr = (struct ifreq*) ((char*) ifr + ifr->ifr_addr.sa_len +
+ IFNAMSIZ);
+ }
+
+
+#ifdef DEBUG
+ if (i <= 0) {
+ fprintf(stderr,"interface not found\n");
+ close(fd);
+ return -1;
+ }
+#endif
+
+ if (ioctl(fd, SIOCGIFNETMASK, ifr) != 0) {
+#ifdef DEBUG
+ fprintf(stderr,"SIOCGIFNETMASK failed\n");
+#endif
+ close(fd);
+ return -1;
+ }
+
+ close(fd);
+
+ (*nmask) = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
+#ifdef DEBUG
+ fprintf(stderr,"netmask %s\n", inet_ntoa(*nmask));
+#endif
+ return 0;
+}
+
+#else /* a dummy version */
+ int get_netmask(struct in_addr *ipaddr, struct in_addr *nmask)
+{
+ return -1;
+}
+#endif
+
+
+#ifdef AUTOCONF
+/* this is the autoconf driver to test get_netmask() */
+
+ main()
+{
+ char buf[1024];
+ struct hostent *hp;
+ struct in_addr ip, nmask;
+
+ if (gethostname(buf, sizeof(buf)-1) != 0) {
+ fprintf(stderr,"gethostname failed\n");
+ exit(1);
+ }
+
+ hp = gethostbyname(buf);
+
+ if (!hp) {
+ fprintf(stderr,"gethostbyname failed\n");
+ exit(1);
+ }
+
+ memcpy((char *)&ip, (char *)hp->h_addr, hp->h_length);
+
+ if (get_netmask(&ip, &nmask) == 0) exit(0);
+
+ fprintf(stderr,"get_netmask failed\n");
+ exit(1);
+}
+#endif
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