[PATCH 1/4] util: introduce a new helper for get interface IPv6 address

[Luyao Huang <lhuang@xxxxxxxxxx>]

Introduce a new function to help to get interface IPv6 address.

Signed-off-by: Luyao Huang <lhuang@xxxxxxxxxx>
---
 src/libvirt_private.syms |  1 +
 src/util/virnetdev.c     | 70 ++++++++++++++++++++++++++++++++++++++++++++++++
 src/util/virnetdev.h     |  2 ++
 3 files changed, 73 insertions(+)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 645aef1..f60911c 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1659,6 +1659,7 @@ virNetDevDelMulti;
 virNetDevExists;
 virNetDevGetIndex;
 virNetDevGetIPv4Address;
+virNetDevGetIPv6Address;
 virNetDevGetLinkInfo;
 virNetDevGetMAC;
 virNetDevGetMTU;
diff --git a/src/util/virnetdev.c b/src/util/virnetdev.c
index 2a0eb43..c1a588e 100644
--- a/src/util/virnetdev.c
+++ b/src/util/virnetdev.c
@@ -33,6 +33,10 @@
 #include "virstring.h"
 #include "virutil.h"
 
+#if defined(HAVE_GETIFADDRS)
+# include <ifaddrs.h>
+#endif
+
 #include <sys/ioctl.h>
 #include <net/if.h>
 #include <fcntl.h>
@@ -1432,6 +1436,72 @@ int virNetDevGetIPv4Address(const char *ifname ATTRIBUTE_UNUSED,
 
 #endif /* ! SIOCGIFADDR */
 
+/**
+ *virNetDevGetIPv6Address:
+ *@ifname: name of the interface whose IP address we want
+ *@addr: filled with the IPv6 address
+ *
+ *This function gets the IPv6 address for the interface @ifname
+ *and stores it in @addr
+ *
+ *Returns 0 on success, -1 on failure.
+ */
+#if defined(HAVE_GETIFADDRS)
+int virNetDevGetIPv6Address(const char *ifname,
+                            virSocketAddrPtr addr)
+{
+    struct ifaddrs *ifap, *ifa;
+    int ret = -1;
+    bool found_one = false;
+
+    if (getifaddrs(&ifap) < 0) {
+        virReportSystemError(errno, "%s",
+                             _("Could not get interface list"));
+        return -1;
+    }
+
+    for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
+        if (STRNEQ(ifa->ifa_name, ifname))
+            continue;
+        found_one = true;
+        if (ifa->ifa_addr->sa_family == AF_INET6)
+            break;
+    }
+
+    if (!ifa) {
+        if (found_one)
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("Interface '%s' do not have a IPv6 address"),
+                           ifname);
+        else
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("Interface '%s' not found"),
+                           ifname);
+        goto cleanup;
+    }
+
+    addr->data.stor.ss_family = AF_INET6;
+    addr->len = sizeof(addr->data.inet6);
+    memcpy(&addr->data.inet6, ifa->ifa_addr, addr->len);
+    ret = 0;
+
+ cleanup:
+    freeifaddrs(ifap);
+    return ret;
+}
+
+#else
+
+int virNetDevGetIPv6Address(const char *ifname ATTRIBUTE_UNUSED,
+                            virSocketAddrPtr addr ATTRIBUTE_UNUSED)
+{
+    virReportSystemError(ENOSYS, "%s",
+                         _("Unable to get IPv6 address on this platform"));
+    return -1;
+}
+
+#endif
+
 
 /**
  * virNetDevValidateConfig:
diff --git a/src/util/virnetdev.h b/src/util/virnetdev.h
index de8b480..c065381 100644
--- a/src/util/virnetdev.h
+++ b/src/util/virnetdev.h
@@ -104,6 +104,8 @@ int virNetDevClearIPAddress(const char *ifname,
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
 int virNetDevGetIPv4Address(const char *ifname, virSocketAddrPtr addr)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
+int virNetDevGetIPv6Address(const char *ifname, virSocketAddrPtr addr)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
 
 
 int virNetDevSetMAC(const char *ifname,
-- 
1.8.3.1

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