util: report all address range errors in virSocketAddrGetRange()

There are now many more reasons that virSocketAddrGetRange() could
fail, so it is much more informative to report the error there instead
of in the caller. (one of the two callers was previously assuming
success, which is almost surely safe based on the parsing that has
already happened to the config by that time, but it still is nicer to
account for an error "just in case")

Part of fix for: https://bugzilla.redhat.com/show_bug.cgi?id=985653

src/conf/network_conf.c

@@ -861,12 +861,8 @@ virSocketAddrRangeParseXML(const char *networkName,
 
     /* do a sanity check of the range */
     if (virSocketAddrGetRange(&range->start, &range->end, &ipdef->address,
-                              virNetworkIpDefPrefix(ipdef)) < 0) {
-        virReportError(VIR_ERR_XML_ERROR,
-                       _("Invalid dhcp range '%s' to '%s' in network '%s'"),
-                       start, end, networkName);
+                              virNetworkIpDefPrefix(ipdef)) < 0)
         goto cleanup;
-    }
 
     ret = 0;
 

src/network/bridge_driver.c

@@ -1181,6 +1181,8 @@ networkDnsmasqConfContents(virNetworkObjPtr network,
 
     while (ipdef) {
         for (r = 0; r < ipdef->nranges; r++) {
+            int thisRange;
+
             if (!(saddr = virSocketAddrFormat(&ipdef->ranges[r].start)) ||
                 !(eaddr = virSocketAddrFormat(&ipdef->ranges[r].end)))
                 goto cleanup;
@@ -1189,10 +1191,13 @@ networkDnsmasqConfContents(virNetworkObjPtr network,
                               saddr, eaddr);
             VIR_FREE(saddr);
             VIR_FREE(eaddr);
-            nbleases += virSocketAddrGetRange(&ipdef->ranges[r].start,
+            thisRange = virSocketAddrGetRange(&ipdef->ranges[r].start,
                                               &ipdef->ranges[r].end,
                                               &ipdef->address,
                                               virNetworkIpDefPrefix(ipdef));
+            if (thisRange < 0)
+                goto cleanup;
+            nbleases += thisRange;
         }
 
         /*

src/util/virsocketaddr.c

@@ -26,6 +26,7 @@
 #include "virsocketaddr.h"
 #include "virerror.h"
 #include "virstring.h"
+#include "viralloc.h"
 
 #include <netdb.h>
 
@@ -623,32 +624,63 @@ virSocketAddrGetRange(virSocketAddrPtr start, virSocketAddrPtr end,
     int ret = 0;
     size_t i;
     virSocketAddr netmask;
+    char *startStr = NULL, *endStr = NULL, *netStr = NULL;
 
-    if (start == NULL || end == NULL || network == NULL)
-        return -1;
+    if (start == NULL || end == NULL || network == NULL) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("NULL argument - %p %p %p"), start, end, network);
+        goto error;
+    }
+
+    startStr = virSocketAddrFormat(start);
+    endStr = virSocketAddrFormat(end);
+    netStr = virSocketAddrFormat(network);
+    if (!(startStr && endStr && netStr))
+        goto error; /*error already reported */
 
     if (VIR_SOCKET_ADDR_FAMILY(start) != VIR_SOCKET_ADDR_FAMILY(end) ||
-        VIR_SOCKET_ADDR_FAMILY(start) != VIR_SOCKET_ADDR_FAMILY(network))
-        return -1;
+        VIR_SOCKET_ADDR_FAMILY(start) != VIR_SOCKET_ADDR_FAMILY(network)) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("mismatch of address family in "
+                         "range %s - %s for network %s"),
+                       startStr, endStr, netStr);
+        goto error;
+    }
 
     if (prefix < 0 ||
-        virSocketAddrPrefixToNetmask(prefix, &netmask, VIR_SOCKET_ADDR_FAMILY(network)) < 0)
-        return -1;
+        virSocketAddrPrefixToNetmask(prefix, &netmask,
+                                     VIR_SOCKET_ADDR_FAMILY(network)) < 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("bad prefix %d for network %s when "
+                         " checking range %s - %s"),
+                       prefix, netStr, startStr, endStr);
+        goto error;
+    }
 
     /* both start and end of range need to be in the same network as
      * "network"
      */
     if (virSocketAddrCheckNetmask(start, network, &netmask) <= 0 ||
-        virSocketAddrCheckNetmask(end, network, &netmask) <= 0)
-        return -1;
+        virSocketAddrCheckNetmask(end, network, &netmask) <= 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("range %s - %s is not entirely within "
+                         "network %s/%d"),
+                       startStr, endStr, netStr, prefix);
+        goto error;
+    }
 
     if (VIR_SOCKET_ADDR_IS_FAMILY(start, AF_INET)) {
         virSocketAddrIPv4 t1, t2;
         virSocketAddr netaddr, broadcast;
 
         if (virSocketAddrBroadcast(network, &netmask, &broadcast) < 0 ||
-            virSocketAddrMask(network, &netmask, &netaddr) < 0)
-           return -1;
+            virSocketAddrMask(network, &netmask, &netaddr) < 0) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("failed to construct broadcast or network "
+                             "address for network %s/%d"),
+                           netStr, prefix);
+            goto error;
+        }
 
         /* Don't allow the start of the range to be the network
          * address (usually "...0") or the end of the range to be the
@@ -657,47 +689,104 @@ virSocketAddrGetRange(virSocketAddrPtr start, virSocketAddrPtr end,
          * other combined checks) (IPv6 doesn't have broadcast and
          * network addresses, so this check is only done for IPv4)
          */
-        if (virSocketAddrEqual(start, &netaddr) ||
-            virSocketAddrEqual(end, &broadcast))
-            return -1;
+        if (virSocketAddrEqual(start, &netaddr)) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("start of range %s - %s in network %s/%d "
+                             "is the network address"),
+                           startStr, endStr, netStr, prefix);
+            goto error;
+        }
+
+        if (virSocketAddrEqual(end, &broadcast)) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("end of range %s - %s in network %s/%d "
+                             "is the broadcast address"),
+                           startStr, endStr, netStr, prefix);
+            goto error;
+        }
 
         if ((virSocketAddrGetIPv4Addr(start, &t1) < 0) ||
-            (virSocketAddrGetIPv4Addr(end, &t2) < 0))
-            return -1;
+            (virSocketAddrGetIPv4Addr(end, &t2) < 0)) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("failed to get IPv4 address "
+                             "for start or end of range %s - %s "
+                             "in network %s/%d"),
+                           startStr, endStr, netStr, prefix);
+            goto error;
+        }
 
         /* legacy check that everything except the last two bytes are
          * the same
          */
         for (i = 0; i < 2; i++) {
-            if (t1[i] != t2[i])
-                return -1;
+            if (t1[i] != t2[i]) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("range %s - %s is too large (> 65535) "
+                             "in network %s/%d"),
+                           startStr, endStr, netStr, prefix);
+            goto error;
+            }
         }
         ret = (t2[2] - t1[2]) * 256 + (t2[3] - t1[3]);
-        if (ret < 0)
-            return -1;
+        if (ret < 0) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("range %s - %s is reversed "
+                             "in network %s/%d"),
+                           startStr, endStr, netStr, prefix);
+            goto error;
+        }
         ret++;
     } else if (VIR_SOCKET_ADDR_IS_FAMILY(start, AF_INET6)) {
         virSocketAddrIPv6 t1, t2;
 
         if ((virSocketAddrGetIPv6Addr(start, &t1) < 0) ||
-            (virSocketAddrGetIPv6Addr(end, &t2) < 0))
-            return -1;
+            (virSocketAddrGetIPv6Addr(end, &t2) < 0)) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("failed to get IPv6 address "
+                             "for start or end of range %s - %s "
+                             "in network %s/%d"),
+                           startStr, endStr, netStr, prefix);
+            goto error;
+        }
 
         /* legacy check that everything except the last two bytes are
          * the same
          */
         for (i = 0; i < 7; i++) {
-            if (t1[i] != t2[i])
-                return -1;
+            if (t1[i] != t2[i]) {
+                virReportError(VIR_ERR_INTERNAL_ERROR,
+                               _("range %s - %s is too large (> 65535) "
+                                 "in network %s/%d"),
+                               startStr, endStr, netStr, prefix);
+                goto error;
+            }
         }
         ret = t2[7] - t1[7];
-        if (ret < 0)
-            return -1;
+        if (ret < 0) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("range %s - %s start larger than end "
+                             "in network %s/%d"),
+                           startStr, endStr, netStr, prefix);
+            goto error;
+        }
         ret++;
     } else {
-        return -1;
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("unsupported address family "
+                         "for range %s - %s "
+                         "in network %s/%d, must be ipv4 or ipv6"),
+                       startStr, endStr, netStr, prefix);
+        goto error;
     }
+ cleanup:
+    VIR_FREE(startStr);
+    VIR_FREE(endStr);
+    VIR_FREE(netStr);
     return ret;
+
+ error:
+    ret = -1;
+    goto cleanup;
 }