darkstat: Add support to darkstat to allow multiple local networks to be

specified for montioring

eg allows ipv4 and ipv6 forwarded traffic to be monitored from
both main network and dmz in single graph

Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified
    it.

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved

Signed-off-by: Simon Day <email@simonday.info>

net/darkstat/patches/101-allow-multiple-local-interfaces.patch

@@ -0,0 +1,70 @@
+--- a/acct.c
++++ b/acct.c
+@@ -37,8 +37,9 @@
+ 
+ uint64_t acct_total_packets = 0, acct_total_bytes = 0;
+ 
++#define LOCAL_NET_MAX 10
+ static int using_localnet4 = 0, using_localnet6 = 0;
+-static struct addr localnet4, localmask4, localnet6, localmask6;
++static struct addr localnet4[LOCAL_NET_MAX], localmask4[LOCAL_NET_MAX], localnet6[LOCAL_NET_MAX], localmask6[LOCAL_NET_MAX];
+ 
+ /* Parse the net/mask specification into two IPs or die trying. */
+ void
+@@ -120,13 +121,19 @@ acct_init_localnet(const char *spec)
+    /* Register the correct netmask and calculate the correct net.  */
+    addr_mask(&localnet, &localmask);
+    if (localnet.family == IPv6) {
+-      using_localnet6 = 1;
+-      localnet6 = localnet;
+-      localmask6 = localmask;
++      if(using_localnet6 >= LOCAL_NET_MAX){
++	errx(1, "Exceeded maximum IPv6 local networks");
++      }
++      localnet6[using_localnet6] = localnet;
++      localmask6[using_localnet6] = localmask;
++      using_localnet6++;
+    } else {
+-      using_localnet4 = 1;
+-      localnet4 = localnet;
+-      localmask4 = localmask;
++      if(using_localnet4 >= LOCAL_NET_MAX){
++	errx(1, "Exceeded maximum IPv4 local networks");
++      }
++      localnet4[using_localnet4] = localnet;
++      localmask4[using_localnet4] = localmask;
++      using_localnet4++;
+    }
+ 
+    verbosef("local network address: %s", addr_to_str(&localnet));
+@@ -138,11 +145,15 @@ static int addr_is_local(const struct addr * const a,
+    if (is_localip(a, local_ips))
+       return 1;
+    if (a->family == IPv4 && using_localnet4) {
+-      if (addr_inside(a, &localnet4, &localmask4))
+-         return 1;
++      for (int i=0; i < using_localnet4; i++){	   
++        if (addr_inside(a, &localnet4[i], &localmask4[i]))
++           return 1;
++      }
+    } else if (a->family == IPv6 && using_localnet6) {
+-      if (addr_inside(a, &localnet6, &localmask6))
+-         return 1;
++      for (int i=0; i < using_localnet6; i++){	   
++        if (addr_inside(a, &localnet6[i], &localmask6[i]))
++           return 1;
++      }
+    }
+    return 0;
+ }
+--- a/darkstat.c
++++ b/darkstat.c
+@@ -193,7 +193,7 @@ static struct cmdline_arg cmdline_args[] = {
+    {"-r",             "capfile",         cb_capfile,      0},
+    {"-p",             "port",            cb_port,         0},
+    {"-b",             "bindaddr",        cb_bindaddr,    -1},
+-   {"-l",             "network/netmask", cb_local,        0},
++   {"-l",             "network/netmask", cb_local,       -1},
+    {"--base",         "path",            cb_base,         0},
+    {"--local-only",   NULL,              cb_local_only,   0},
+    {"--snaplen",      "bytes",           cb_snaplen,      0},