start net_info impl for windows

src/os/win32/sigar_os.h

@@ -43,6 +43,39 @@ static __inline sigar_uint64_t FileTimeToTime(FILETIME *ft)
                                         lpw, -1, (LPSTR)lpa, chars, \
                                         NULL, NULL))
 
+/* from iptypes.h not in vs6.0 */
+#define MAX_ADAPTER_DESCRIPTION_LENGTH  128
+#define MAX_ADAPTER_NAME_LENGTH         256
+#define MAX_ADAPTER_ADDRESS_LENGTH      8
+#define MAX_HOSTNAME_LEN                128
+#define MAX_DOMAIN_NAME_LEN             128
+#define MAX_SCOPE_ID_LEN                256
+
+typedef struct {
+    char String[4 * 4];
+} IP_ADDRESS_STRING, *PIP_ADDRESS_STRING, IP_MASK_STRING, *PIP_MASK_STRING;
+
+typedef struct _IP_ADDR_STRING {
+    struct _IP_ADDR_STRING* Next;
+    IP_ADDRESS_STRING IpAddress;
+    IP_MASK_STRING IpMask;
+    DWORD Context;
+} IP_ADDR_STRING, *PIP_ADDR_STRING;
+
+typedef struct {
+    char HostName[MAX_HOSTNAME_LEN + 4];
+    char DomainName[MAX_DOMAIN_NAME_LEN + 4];
+    PIP_ADDR_STRING CurrentDnsServer;
+    IP_ADDR_STRING DnsServerList;
+    UINT NodeType;
+    char ScopeId[MAX_SCOPE_ID_LEN + 4];
+    UINT EnableRouting;
+    UINT EnableProxy;
+    UINT EnableDns;
+} FIXED_INFO, *PFIXED_INFO;
+
+/* end iptypes.h */
+
 #include <iprtrmib.h>
 
 /* undocumented structures */
@@ -87,6 +120,8 @@ typedef DWORD (CALLBACK *LPGETTCPEXTABLE)(PMIB_TCPEXTABLE *, BOOL, HANDLE,
 typedef DWORD (CALLBACK *LPGETUDPEXTABLE)(PMIB_UDPEXTABLE *, BOOL, HANDLE,
                                           DWORD, DWORD);
 
+typedef DWORD (CALLBACK *LPNETPARAMS)(PFIXED_INFO, PULONG);
+
 typedef DWORD (CALLBACK *LPSYSINFO)(DWORD, PVOID, ULONG, PULONG);
 
 typedef BOOL (CALLBACK *LPENUMMODULES)(HANDLE, HMODULE*,
@@ -135,6 +170,7 @@ struct sigar_t {
     LPGETTCPEXTABLE get_tcpx_table;
     LPGETUDPTABLE get_udp_table;
     LPGETUDPEXTABLE get_udpx_table;
+    LPNETPARAMS get_net_params;
     LPSYSINFO get_ntsys_info;
     LPENUMMODULES enum_modules;
     LPGETMODULENAME get_module_name;

src/os/win32/win32_sigar.c

@@ -225,6 +225,8 @@ int sigar_os_open(sigar_t **sigar)
             (LPGETUDPEXTABLE)GetProcAddress(h,
                                             "AllocateAndGet"
                                             "UdpExTableFromStack");
+        (*sigar)->get_net_params =
+            (LPNETPARAMS)GetProcAddress(h, "GetNetworkParams");
         (*sigar)->ip_handle = h;
     }
     else {
@@ -1602,6 +1604,37 @@ SIGAR_DECLARE(int) sigar_cpu_info_list_get(sigar_t *sigar,
     return SIGAR_OK;
 }
 
+SIGAR_DECLARE(int) sigar_net_info_get(sigar_t *sigar,
+                                      sigar_net_info_t *netinfo)
+{
+    FIXED_INFO info;
+    ULONG len;
+    IP_ADDR_STRING *ip;
+
+    if (!sigar->get_net_params) {
+        return SIGAR_ENOTIMPL;
+    }
+
+    SIGAR_ZERO(netinfo);
+
+    len = sizeof(info);
+
+    if (sigar->get_net_params(&info, &len) != ERROR_SUCCESS) {
+        return GetLastError();
+    }
+
+    SIGAR_SSTRCPY(netinfo->domain_name, info.DomainName);
+    SIGAR_SSTRCPY(netinfo->primary_dns,
+                  info.DnsServerList.IpAddress.String);
+
+    if ((ip = info.DnsServerList.Next)) {
+        SIGAR_SSTRCPY(netinfo->secondary_dns,
+                      ip->IpAddress.String);
+    }
+
+    return SIGAR_OK;
+}
+
 SIGAR_DECLARE(int) sigar_net_route_list_get(sigar_t *sigar,
                                             sigar_net_route_list_t *routelist)
 {

src/sigar.c

@@ -750,12 +750,6 @@ SIGAR_DECLARE(int) sigar_who_list_get(sigar_t *sigar,
     return SIGAR_ENOTIMPL;
 }
 
-SIGAR_DECLARE(int) sigar_net_info_get(sigar_t *sigar,
-                                      sigar_net_info_t *netinfo)
-{
-    return SIGAR_ENOTIMPL;
-}
-
 SIGAR_DECLARE(int) sigar_resource_limit_get(sigar_t *sigar,
                                             sigar_resource_limit_t *rlimit)
 {