Include length with virSocketAddr data

Some operations on socket addresses need to know the length of
the sockaddr struct for the particular address family. This
info was being discarded when passing around virSocketAddr
instances. Turn it from a union into a struct containing
union+socklen_t fields, so length is always kept around.

* src/util/network.h: Add socklen_t field to virSocketAddr
* src/util/network.c, src/network/bridge_driver.c,
  src/conf/domain_conf.c: Update to take account of new
  struct definition.

src/conf/domain_conf.c

@@ -2522,7 +2522,7 @@ virDomainChrDefParseTargetXML(virCapsPtr caps,
                 goto error;
             }
 
-            if (def->target.addr->stor.ss_family != AF_INET) {
+            if (def->target.addr->data.stor.ss_family != AF_INET) {
                 virDomainReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                                      "%s", _("guestfwd channel only supports "
                                              "IPv4 addresses"));

src/network/bridge_driver.c

@@ -1060,14 +1060,14 @@ static int networkCheckRouteCollision(virNetworkObjPtr network)
         goto error;
     }
 
-    if (inaddress.stor.ss_family != AF_INET ||
-        innetmask.stor.ss_family != AF_INET) {
+    if (inaddress.data.stor.ss_family != AF_INET ||
+        innetmask.data.stor.ss_family != AF_INET) {
         /* Only support collision check for IPv4 */
         goto out;
     }
 
-    net_dest = (inaddress.inet4.sin_addr.s_addr &
-                innetmask.inet4.sin_addr.s_addr);
+    net_dest = (inaddress.data.inet4.sin_addr.s_addr &
+                innetmask.data.inet4.sin_addr.s_addr);
 
     /* Read whole routing table into memory */
     if ((len = virFileReadAll(PROC_NET_ROUTE, MAX_ROUTE_SIZE, &buf)) < 0)
@@ -1120,7 +1120,7 @@ static int networkCheckRouteCollision(virNetworkObjPtr network)
         addr_val &= mask_val;
 
         if ((net_dest == addr_val) &&
-            (innetmask.inet4.sin_addr.s_addr == mask_val)) {
+            (innetmask.data.inet4.sin_addr.s_addr == mask_val)) {
             networkReportError(VIR_ERR_INTERNAL_ERROR,
                               _("Network %s/%s is already in use by "
                                 "interface %s"),

src/util/network.c

@@ -27,10 +27,10 @@ static int getIPv4Addr(virSocketAddrPtr addr, virIPv4AddrPtr tab) {
     unsigned long val;
     int i;
 
-    if ((addr == NULL) || (tab == NULL) || (addr->stor.ss_family != AF_INET))
+    if ((addr == NULL) || (tab == NULL) || (addr->data.stor.ss_family != AF_INET))
         return(-1);
 
-    val = ntohl(addr->inet4.sin_addr.s_addr);
+    val = ntohl(addr->data.inet4.sin_addr.s_addr);
 
     for (i = 0;i < 4;i++) {
         (*tab)[3 - i] = val & 0xFF;
@@ -43,12 +43,12 @@ static int getIPv4Addr(virSocketAddrPtr addr, virIPv4AddrPtr tab) {
 static int getIPv6Addr(virSocketAddrPtr addr, virIPv6AddrPtr tab) {
     int i;
 
-    if ((addr == NULL) || (tab == NULL) || (addr->stor.ss_family != AF_INET6))
+    if ((addr == NULL) || (tab == NULL) || (addr->data.stor.ss_family != AF_INET6))
         return(-1);
 
     for (i = 0;i < 8;i++) {
-        (*tab)[i] = ((addr->inet6.sin6_addr.s6_addr[2 * i] << 8) |
-                     addr->inet6.sin6_addr.s6_addr[2 * i + 1]);
+        (*tab)[i] = ((addr->data.inet6.sin6_addr.s6_addr[2 * i] << 8) |
+                     addr->data.inet6.sin6_addr.s6_addr[2 * i + 1]);
     }
 
     return(0);
@@ -81,8 +81,10 @@ virSocketParseAddr(const char *val, virSocketAddrPtr addr, int hint) {
     }
 
     len = res->ai_addrlen;
-    if (addr != NULL)
-        memcpy(&addr->stor, res->ai_addr, len);
+    if (addr != NULL) {
+        memcpy(&addr->data.stor, res->ai_addr, len);
+        addr->len = res->ai_addrlen;
+    }
 
     freeaddrinfo(res);
     return(len);
@@ -133,14 +135,14 @@ virSocketFormatAddr(virSocketAddrPtr addr) {
     if (addr == NULL)
         return NULL;
 
-    if (addr->stor.ss_family == AF_INET) {
+    if (addr->data.stor.ss_family == AF_INET) {
         outlen = INET_ADDRSTRLEN;
-        inaddr = &addr->inet4.sin_addr;
+        inaddr = &addr->data.inet4.sin_addr;
     }
 
-    else if (addr->stor.ss_family == AF_INET6) {
+    else if (addr->data.stor.ss_family == AF_INET6) {
         outlen = INET6_ADDRSTRLEN;
-        inaddr = &addr->inet6.sin6_addr;
+        inaddr = &addr->data.inet6.sin6_addr;
     }
 
     else {
@@ -150,7 +152,7 @@ virSocketFormatAddr(virSocketAddrPtr addr) {
     if (VIR_ALLOC_N(out, outlen) < 0)
         return NULL;
 
-    if (inet_ntop(addr->stor.ss_family, inaddr, out, outlen) == NULL) {
+    if (inet_ntop(addr->data.stor.ss_family, inaddr, out, outlen) == NULL) {
         VIR_FREE(out);
         return NULL;
     }
@@ -174,12 +176,12 @@ virSocketSetPort(virSocketAddrPtr addr, int port) {
 
     port = htons(port);
 
-    if(addr->stor.ss_family == AF_INET) {
-        addr->inet4.sin_port = port;
+    if(addr->data.stor.ss_family == AF_INET) {
+        addr->data.inet4.sin_port = port;
     }
 
-    else if(addr->stor.ss_family == AF_INET6) {
-        addr->inet6.sin6_port = port;
+    else if(addr->data.stor.ss_family == AF_INET6) {
+        addr->data.inet6.sin6_port = port;
     }
 
     else {
@@ -201,12 +203,12 @@ virSocketGetPort(virSocketAddrPtr addr) {
     if (addr == NULL)
         return -1;
 
-    if(addr->stor.ss_family == AF_INET) {
-        return ntohs(addr->inet4.sin_port);
+    if(addr->data.stor.ss_family == AF_INET) {
+        return ntohs(addr->data.inet4.sin_port);
     }
 
-    else if(addr->stor.ss_family == AF_INET6) {
-        return ntohs(addr->inet6.sin6_port);
+    else if(addr->data.stor.ss_family == AF_INET6) {
+        return ntohs(addr->data.inet6.sin6_port);
     }
 
     return -1;
@@ -245,14 +247,14 @@ int virSocketCheckNetmask(virSocketAddrPtr addr1, virSocketAddrPtr addr2,
 
     if ((addr1 == NULL) || (addr2 == NULL) || (netmask == NULL))
         return(-1);
-    if ((addr1->stor.ss_family != addr2->stor.ss_family) ||
-        (addr1->stor.ss_family != netmask->stor.ss_family))
+    if ((addr1->data.stor.ss_family != addr2->data.stor.ss_family) ||
+        (addr1->data.stor.ss_family != netmask->data.stor.ss_family))
         return(-1);
 
     if (virSocketAddrIsNetmask(netmask) != 0)
         return(-1);
 
-    if (addr1->stor.ss_family == AF_INET) {
+    if (addr1->data.stor.ss_family == AF_INET) {
         virIPv4Addr t1, t2, tm;
 
         if ((getIPv4Addr(addr1, &t1) < 0) ||
@@ -265,7 +267,7 @@ int virSocketCheckNetmask(virSocketAddrPtr addr1, virSocketAddrPtr addr2,
                 return(0);
         }
 
-    } else if (addr1->stor.ss_family == AF_INET) {
+    } else if (addr1->data.stor.ss_family == AF_INET) {
         virIPv6Addr t1, t2, tm;
 
         if ((getIPv6Addr(addr1, &t1) < 0) ||
@@ -301,10 +303,10 @@ int virSocketGetRange(virSocketAddrPtr start, virSocketAddrPtr end) {
 
     if ((start == NULL) || (end == NULL))
         return(-1);
-    if (start->stor.ss_family != end->stor.ss_family)
+    if (start->data.stor.ss_family != end->data.stor.ss_family)
         return(-1);
 
-    if (start->stor.ss_family == AF_INET) {
+    if (start->data.stor.ss_family == AF_INET) {
         virIPv4Addr t1, t2;
 
         if ((getIPv4Addr(start, &t1) < 0) ||
@@ -319,7 +321,7 @@ int virSocketGetRange(virSocketAddrPtr start, virSocketAddrPtr end) {
         if (ret < 0)
             return(-1);
         ret++;
-    } else if (start->stor.ss_family == AF_INET6) {
+    } else if (start->data.stor.ss_family == AF_INET6) {
         virIPv6Addr t1, t2;
 
         if ((getIPv6Addr(start, &t1) < 0) ||
@@ -355,7 +357,7 @@ int virSocketGetNumNetmaskBits(const virSocketAddrPtr netmask)
     int i, j;
     int c = 0;
 
-    if (netmask->stor.ss_family == AF_INET) {
+    if (netmask->data.stor.ss_family == AF_INET) {
         virIPv4Addr tm;
         uint8_t bit;
 
@@ -389,7 +391,7 @@ int virSocketGetNumNetmaskBits(const virSocketAddrPtr netmask)
         }
 
         return c;
-    } else if (netmask->stor.ss_family == AF_INET6) {
+    } else if (netmask->data.stor.ss_family == AF_INET6) {
         virIPv6Addr tm;
         uint16_t bit;
 

src/util/network.h

@@ -17,11 +17,15 @@
 # include <sys/socket.h>
 # include <netdb.h>
 
-typedef union {
+typedef struct {
+    union {
         struct sockaddr_storage stor;
         struct sockaddr_in inet4;
         struct sockaddr_in6 inet6;
+    } data;
+    socklen_t len;
 } virSocketAddr;
+
 typedef virSocketAddr *virSocketAddrPtr;
 
 int virSocketParseAddr    (const char *val,