add radius_bind_{min,max} options

[l2tpns.git] / radius.c

diff --git a/radius.c b/radius.c
index fdb54a1..60b97a4 100644 (file)
--- a/radius.c
+++ b/radius.c
@@ -1,6 +1,6 @@
 // L2TPNS Radius Stuff
 
-char const *cvs_id_radius = "$Id: radius.c,v 1.51 2006/06/11 12:46:18 bodea Exp $";
+char const *cvs_id_radius = "$Id: radius.c,v 1.52 2006/07/01 12:40:17 bodea Exp $";
 
 #include <time.h>
 #include <stdio.h>
@@ -45,6 +45,25 @@ static void calc_auth(const void *buf, size_t len, const uint8_t *in, uint8_t *o
 void initrad(void)
 {
        int i;
+       uint16_t port = 0;
+       uint16_t min = config->radius_bind_min;
+       uint16_t max = config->radius_bind_max;
+       int inc = 1;
+       struct sockaddr_in addr;
+
+       if (min)
+       {
+               port = min;
+               if (!max)
+                       max = ~0 - 1;
+       }
+       else if (max) /* no minimum specified, bind from max down */
+       {
+               port = max;
+               min = 1;
+               inc = -1;
+       }
+
        LOG(3, 0, 0, "Creating %d sockets for RADIUS queries\n", RADIUS_FDS);
        radfds = calloc(sizeof(int), RADIUS_FDS);
        for (i = 0; i < RADIUS_FDS; i++)
@@ -53,6 +72,27 @@ void initrad(void)
                radfds[i] = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
                flags = fcntl(radfds[i], F_GETFL, 0);
                fcntl(radfds[i], F_SETFL, flags | O_NONBLOCK);
+
+               if (port)
+               {
+                       int b;
+
+                       memset(&addr, 0, sizeof(addr));
+                       addr.sin_family = AF_INET;
+                       addr.sin_addr.s_addr = INADDR_ANY;
+
+                       do {
+                               addr.sin_port = htons(port);
+                               if ((b = bind(radfds[i], (struct sockaddr *) &addr, sizeof(addr))) < 0)
+                               {
+                                       if ((port += inc) < min || port > max)
+                                       {
+                                               LOG(0, 0, 0, "Can't bind RADIUS socket in range %u-%u\n", min, max);
+                                               exit(1);
+                                       }
+                               }
+                       } while (b < 0);
+               }
        }
 }