From a2572d9510149926d16750ed0e39c87522a280cb Mon Sep 17 00:00:00 2001
From: Doug MacEachern <dougm@hyperic.com>
Date: Thu, 5 Apr 2007 16:56:42 +0000
Subject: [PATCH] change net_interface_config_primary_get to likely interface
 if none have an ip (unplugged)

---
 src/sigar.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/sigar.c b/src/sigar.c
index 5c92888d..73c7a6eb 100644
--- a/src/sigar.c
+++ b/src/sigar.c
@@ -1872,6 +1872,9 @@ sigar_net_interface_config_primary_get(sigar_t *sigar,
 {
     int i, status, found=0;
     sigar_net_interface_list_t iflist;
+    sigar_net_interface_config_t possible_config;
+
+    possible_config.flags = 0;
 
     if ((status = sigar_net_interface_list_get(sigar, &iflist)) != SIGAR_OK) {
         return status;
@@ -1883,12 +1886,20 @@ sigar_net_interface_config_primary_get(sigar_t *sigar,
 
         if ((status != SIGAR_OK) ||
             (ifconfig->flags & SIGAR_IFF_LOOPBACK) ||
-            !ifconfig->address.addr.in ||  /* no ip address */
             !ifconfig->hwaddr.addr.in ||   /* no mac address */
             strchr(iflist.data[i], ':'))  /* alias */
         {
             continue;
         }
+
+        if (!possible_config.flags) {
+            /* save for later for use if we're not connected to the net */
+            memcpy(&possible_config, ifconfig, sizeof(*ifconfig));
+        }
+        if (!ifconfig->address.addr.in) {
+            continue; /* no ip address */
+        }
+
         found = 1;
         break;
     }
@@ -1898,6 +1909,10 @@ sigar_net_interface_config_primary_get(sigar_t *sigar,
     if (found) {
         return SIGAR_OK;
     }
+    else if (possible_config.flags) {
+        memcpy(ifconfig, &possible_config, sizeof(*ifconfig));
+        return SIGAR_OK;
+    }
     else {
         return SIGAR_ENXIO;
     }
@@ -1913,6 +1928,9 @@ static int fqdn_ip_get(sigar_t *sigar, char *name)
     if (status != SIGAR_OK) {
         return status;
     }
+    if (!ifconfig.address.addr.in) {
+        return SIGAR_ENXIO;
+    }
 
     sigar_net_address_to_string(sigar, &ifconfig.address, name);