test-server: Configure network interface

Require ROOT priviledge to:
1. Run external command to configure and bring up network interface.
2. Enable kernel IP forwarding.

diff --git a/gatchat/test-server.c b/gatchat/test-server.c
index 71e4986..2f5dab2 100644 (file)
--- a/gatchat/test-server.c
+++ b/gatchat/test-server.c
@@ -50,6 +50,7 @@
 
 #define DEFAULT_TCP_PORT 12346
 #define DEFAULT_SOCK_PATH "./server_sock"
+#define IFCONFIG_PATH "/sbin/ifconfig"
 
 static int modem_mode = 0;
 static int modem_creg = 0;
@@ -91,15 +92,40 @@ static void server_debug(const char *str, void *data)
        g_print("%s: %s\n", (char *) data, str);
 }
 
+static gboolean execute(const char *cmd)
+{
+       int status;
+
+       status = system(cmd);
+       if (status < 0) {
+               g_print("Failed to execute command: %s\n", strerror(errno));
+               return FALSE;
+       }
+
+       return TRUE;
+}
+
 static void ppp_connect(const char *iface, const char *local, const char *peer,
                        const char *dns1, const char *dns2,
                        gpointer user)
 {
+       char buf[512];
+
        g_print("Network Device: %s\n", iface);
        g_print("IP Address: %s\n", local);
        g_print("Peer IP Address: %s\n", peer);
        g_print("Primary DNS Server: %s\n", dns1);
        g_print("Secondary DNS Server: %s\n", dns2);
+
+       snprintf(buf, sizeof(buf), "%s %s up", IFCONFIG_PATH, iface);
+       execute(buf);
+
+       snprintf(buf, sizeof(buf), "%s %s %s pointopoint %s", IFCONFIG_PATH,
+                               iface, local, peer);
+       execute(buf);
+
+       snprintf(buf, sizeof(buf), "echo 1 > /proc/sys/net/ipv4/ip_forward");
+       execute(buf);
 }
 
 static void ppp_disconnect(GAtPPPDisconnectReason reason, gpointer user)
@@ -130,6 +156,11 @@ static gboolean setup_ppp(gpointer user)
        GAtServer *server = user;
        GAtIO *io;
 
+       if (getuid() != 0) {
+               g_print("Need root priviledge for PPP connection\n");
+               return FALSE;
+       }
+
        io = g_at_server_get_io(server);
 
        g_at_server_suspend(server);