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-rw-r--r--source4/lib/socket/netif.c225
1 files changed, 206 insertions, 19 deletions
diff --git a/source4/lib/socket/netif.c b/source4/lib/socket/netif.c
index e36f268bde..2846813d3f 100644
--- a/source4/lib/socket/netif.c
+++ b/source4/lib/socket/netif.c
@@ -37,6 +37,101 @@
#include "lib/util/tsort.h"
/****************************************************************************
+ Create a struct sockaddr_storage with the netmask bits set to 1.
+****************************************************************************/
+
+bool make_netmask(struct sockaddr_storage *pss_out,
+ const struct sockaddr_storage *pss_in,
+ unsigned long masklen)
+{
+ *pss_out = *pss_in;
+ /* Now apply masklen bits of mask. */
+#if defined(HAVE_IPV6)
+ if (pss_in->ss_family == AF_INET6) {
+ char *p = (char *)&((struct sockaddr_in6 *)pss_out)->sin6_addr;
+ unsigned int i;
+
+ if (masklen > 128) {
+ return false;
+ }
+ for (i = 0; masklen >= 8; masklen -= 8, i++) {
+ *p++ = 0xff;
+ }
+ /* Deal with the partial byte. */
+ *p++ &= (0xff & ~(0xff>>masklen));
+ i++;
+ for (;i < sizeof(struct in6_addr); i++) {
+ *p++ = '\0';
+ }
+ return true;
+ }
+#endif
+ if (pss_in->ss_family == AF_INET) {
+ if (masklen > 32) {
+ return false;
+ }
+ ((struct sockaddr_in *)pss_out)->sin_addr.s_addr =
+ htonl(((0xFFFFFFFFL >> masklen) ^ 0xFFFFFFFFL));
+ return true;
+ }
+ return false;
+}
+
+/****************************************************************************
+ Create a struct sockaddr_storage set to the broadcast or network adress from
+ an incoming sockaddr_storage.
+****************************************************************************/
+
+static void make_bcast_or_net(struct sockaddr_storage *pss_out,
+ const struct sockaddr_storage *pss_in,
+ const struct sockaddr_storage *nmask,
+ bool make_bcast_p)
+{
+ unsigned int i = 0, len = 0;
+ char *pmask = NULL;
+ char *p = NULL;
+ *pss_out = *pss_in;
+
+ /* Set all zero netmask bits to 1. */
+#if defined(HAVE_IPV6)
+ if (pss_in->ss_family == AF_INET6) {
+ p = (char *)&((struct sockaddr_in6 *)pss_out)->sin6_addr;
+ pmask = discard_const_p(char, &((struct sockaddr_in6 *)nmask)->sin6_addr);
+ len = 16;
+ }
+#endif
+ if (pss_in->ss_family == AF_INET) {
+ p = (char *)&((struct sockaddr_in *)pss_out)->sin_addr;
+ pmask = discard_const_p(char, &((struct sockaddr_in *)nmask)->sin_addr);
+ len = 4;
+ }
+
+ for (i = 0; i < len; i++, p++, pmask++) {
+ if (make_bcast_p) {
+ *p = (*p & *pmask) | (*pmask ^ 0xff);
+ } else {
+ /* make_net */
+ *p = (*p & *pmask);
+ }
+ }
+}
+
+void make_bcast(struct sockaddr_storage *pss_out,
+ const struct sockaddr_storage *pss_in,
+ const struct sockaddr_storage *nmask)
+{
+ make_bcast_or_net(pss_out, pss_in, nmask, true);
+}
+
+void make_net(struct sockaddr_storage *pss_out,
+ const struct sockaddr_storage *pss_in,
+ const struct sockaddr_storage *nmask)
+{
+ make_bcast_or_net(pss_out, pss_in, nmask, false);
+}
+
+
+/****************************************************************************
Try the "standard" getifaddrs/freeifaddrs interfaces.
Also gets IPv6 interfaces.
****************************************************************************/
@@ -45,22 +140,38 @@
Get the netmask address for a local interface.
****************************************************************************/
-static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces)
+static int _get_interfaces(TALLOC_CTX *mem_ctx, struct iface_struct **pifaces)
{
+ struct iface_struct *ifaces;
struct ifaddrs *iflist = NULL;
struct ifaddrs *ifptr = NULL;
+ int count;
int total = 0;
+ size_t copy_size;
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) {
+ count = 0;
+ for (ifptr = iflist; ifptr != NULL; ifptr = ifptr->ifa_next) {
+ if (!ifptr->ifa_addr || !ifptr->ifa_netmask) {
+ continue;
+ }
+ if (!(ifptr->ifa_flags & IFF_UP)) {
+ continue;
+ }
+ count += 1;
+ }
- memset(&ifaces[total], '\0', sizeof(ifaces[total]));
+ ifaces = talloc_array(mem_ctx, struct iface_struct, count);
+ if (ifaces == NULL) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ /* Loop through interfaces, looking for given IP address */
+ for (ifptr = iflist; ifptr != NULL; ifptr = ifptr->ifa_next) {
if (!ifptr->ifa_addr || !ifptr->ifa_netmask) {
continue;
@@ -71,13 +182,33 @@ static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces)
continue;
}
- /* We don't support IPv6 *yet* */
- if (ifptr->ifa_addr->sa_family != AF_INET) {
- continue;
+ memset(&ifaces[total], '\0', sizeof(ifaces[total]));
+
+ copy_size = sizeof(struct sockaddr_in);
+
+ ifaces[total].flags = ifptr->ifa_flags;
+
+#if defined(HAVE_IPV6)
+ if (ifptr->ifa_addr->sa_family == AF_INET6) {
+ copy_size = sizeof(struct sockaddr_in6);
}
+#endif
+
+ memcpy(&ifaces[total].ip, ifptr->ifa_addr, copy_size);
+ memcpy(&ifaces[total].netmask, ifptr->ifa_netmask, copy_size);
- ifaces[total].ip = ((struct sockaddr_in *)ifptr->ifa_addr)->sin_addr;
- ifaces[total].netmask = ((struct sockaddr_in *)ifptr->ifa_netmask)->sin_addr;
+ if (ifaces[total].flags & (IFF_BROADCAST|IFF_LOOPBACK)) {
+ make_bcast(&ifaces[total].bcast,
+ &ifaces[total].ip,
+ &ifaces[total].netmask);
+ } else if ((ifaces[total].flags & IFF_POINTOPOINT) &&
+ ifptr->ifa_dstaddr ) {
+ memcpy(&ifaces[total].bcast,
+ ifptr->ifa_dstaddr,
+ copy_size);
+ } else {
+ continue;
+ }
strlcpy(ifaces[total].name, ifptr->ifa_name,
sizeof(ifaces[total].name));
@@ -86,27 +217,82 @@ static int _get_interfaces(struct iface_struct *ifaces, int max_interfaces)
freeifaddrs(iflist);
+ *pifaces = ifaces;
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;
+
+#if defined(HAVE_IPV6)
+ /*
+ * If we have IPv6 - sort these interfaces lower
+ * than any IPv4 ones.
+ */
+ if (i1->ip.ss_family == AF_INET6 &&
+ i2->ip.ss_family == AF_INET) {
+ return -1;
+ } else if (i1->ip.ss_family == AF_INET &&
+ i2->ip.ss_family == AF_INET6) {
+ return 1;
+ }
+
+ if (i1->ip.ss_family == AF_INET6) {
+ struct sockaddr_in6 *s1 = (struct sockaddr_in6 *)&i1->ip;
+ struct sockaddr_in6 *s2 = (struct sockaddr_in6 *)&i2->ip;
+
+ r = memcmp(&s1->sin6_addr,
+ &s2->sin6_addr,
+ sizeof(struct in6_addr));
+ if (r) {
+ return r;
+ }
+
+ s1 = (struct sockaddr_in6 *)&i1->netmask;
+ s2 = (struct sockaddr_in6 *)&i2->netmask;
+
+ r = memcmp(&s1->sin6_addr,
+ &s2->sin6_addr,
+ sizeof(struct in6_addr));
+ if (r) {
+ return r;
+ }
+ }
+#endif
+
+ /* AIX uses __ss_family instead of ss_family inside of
+ sockaddr_storage. Instead of trying to figure out which field to
+ use, we can just cast it to a sockaddr.
+ */
+
+ if (((struct sockaddr *)&i1->ip)->sa_family == AF_INET) {
+ struct sockaddr_in *s1 = (struct sockaddr_in *)&i1->ip;
+ struct sockaddr_in *s2 = (struct sockaddr_in *)&i2->ip;
+
+ r = ntohl(s1->sin_addr.s_addr) -
+ ntohl(s2->sin_addr.s_addr);
+ if (r) {
+ return r;
+ }
+
+ s1 = (struct sockaddr_in *)&i1->netmask;
+ s2 = (struct sockaddr_in *)&i2->netmask;
+
+ return ntohl(s1->sin_addr.s_addr) -
+ ntohl(s2->sin_addr.s_addr);
+ }
+ return 0;
}
/* this wrapper is used to remove duplicates from the interface list generated
above */
-int get_interfaces(struct iface_struct *ifaces, int max_interfaces)
+int get_interfaces(TALLOC_CTX *mem_ctx, struct iface_struct **pifaces)
{
+ struct iface_struct *ifaces;
int total, i, j;
- total = _get_interfaces(ifaces, max_interfaces);
+ total = _get_interfaces(mem_ctx, &ifaces);
if (total <= 0) return total;
/* now we need to remove duplicates */
@@ -123,5 +309,6 @@ int get_interfaces(struct iface_struct *ifaces, int max_interfaces)
}
}
+ *pifaces = ifaces;
return total;
}
generated by cgit (git 2.34.1) at 2024-11-03 19:00:04 +0000