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[l2tpns.git] / radius.c
diff --git a/radius.c b/radius.c
index 7453211..c2474e3 100644 (file)
--- a/radius.c
+++ b/radius.c
@@ -1,6 +1,6 @@
 // L2TPNS Radius Stuff
 
 // L2TPNS Radius Stuff
 
-char const *cvs_id_radius = "$Id: radius.c,v 1.8 2004-07-11 07:57:35 bodea Exp $";
+char const *cvs_id_radius = "$Id: radius.c,v 1.34 2005-06-28 14:48:28 bodea Exp $";
 
 #include <time.h>
 #include <stdio.h>
 
 #include <time.h>
 #include <stdio.h>
@@ -12,59 +12,48 @@ char const *cvs_id_radius = "$Id: radius.c,v 1.8 2004-07-11 07:57:35 bodea Exp $
 #include <arpa/inet.h>
 #include <ctype.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <ctype.h>
 #include <netinet/in.h>
+#include <errno.h>
 #include "md5.h"
 #include "constants.h"
 #include "l2tpns.h"
 #include "plugin.h"
 #include "util.h"
 #include "md5.h"
 #include "constants.h"
 #include "l2tpns.h"
 #include "plugin.h"
 #include "util.h"
+#include "cluster.h"
 
 extern radiust *radius;
 extern sessiont *session;
 extern tunnelt *tunnel;
 
 extern radiust *radius;
 extern sessiont *session;
 extern tunnelt *tunnel;
-extern u32 sessionid;
-extern struct configt *config;
+extern configt *config;
 extern int *radfds;
 extern int *radfds;
-
-const char *radius_state(int state)
-{
-       static char *tmp = NULL;
-       int i;
-       for (i = 0; radius_states[i]; i++)
-               if (i == state) return radius_states[i];
-
-       if (tmp == NULL) tmp = (char *)calloc(64, 1);
-       sprintf(tmp, "%d", state);
-       return tmp;
-}
+extern ip_filtert *ip_filters;
 
 // Set up socket for radius requests
 void initrad(void)
 {
        int i;
 
 // Set up socket for radius requests
 void initrad(void)
 {
        int i;
-       log(3, 0, 0, 0, "Creating %d sockets for RADIUS queries\n", config->num_radfds);
-       radfds = calloc(sizeof(int), config->num_radfds);
-       for (i = 0; i < config->num_radfds; i++)
+       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++)
        {
                int flags;
        {
                int flags;
-               if (!radfds[i]) radfds[i] = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
+               radfds[i] = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
                flags = fcntl(radfds[i], F_GETFL, 0);
                fcntl(radfds[i], F_SETFL, flags | O_NONBLOCK);
        }
 }
 
                flags = fcntl(radfds[i], F_GETFL, 0);
                fcntl(radfds[i], F_SETFL, flags | O_NONBLOCK);
        }
 }
 
-void radiusclear(u16 r, sessionidt s)
+void radiusclear(uint16_t r, sessionidt s)
 {
 {
-       if (s) session[s].radius = 0;
+       if (s) sess_local[s].radius = 0;
        memset(&radius[r], 0, sizeof(radius[r])); // radius[r].state = RADIUSNULL;
 }
 
        memset(&radius[r], 0, sizeof(radius[r])); // radius[r].state = RADIUSNULL;
 }
 
-
-static u16 get_free_radius()
+static uint16_t get_free_radius()
 {
        int count;
 {
        int count;
-       static u32 next_radius_id = 0;
+       static uint32_t next_radius_id = 0;
 
 
-       for (count = MAXRADIUS; count > 0 ; --count)
+       for (count = MAXRADIUS; count > 0; --count)
        {
                ++next_radius_id;               // Find the next ID to check.
                if (next_radius_id >= MAXRADIUS)
        {
                ++next_radius_id;               // Find the next ID to check.
                if (next_radius_id >= MAXRADIUS)
@@ -76,59 +65,61 @@ static u16 get_free_radius()
                }
        }
 
                }
        }
 
-       log(0, 0, 0, 0, "Can't find a free radius session! This is very bad!\n");
+       LOG(0, 0, 0, "Can't find a free radius session! This is very bad!\n");
        return 0;
 }
 
        return 0;
 }
 
-u16 radiusnew(sessionidt s)
+uint16_t radiusnew(sessionidt s)
 {
 {
-       u16 r = session[s].radius;
+       uint16_t r = sess_local[s].radius;
 
        /* re-use */
        if (r)
        {
 
        /* re-use */
        if (r)
        {
-               log(3, 0, s, session[s].tunnel, "Re-used radius %d\n", r);
+               LOG(3, s, session[s].tunnel, "Re-used radius %d\n", r);
                return r;
        }
 
        if (!(r = get_free_radius()))
        {
                return r;
        }
 
        if (!(r = get_free_radius()))
        {
-               log(1, 0, s, session[s].tunnel, "No free RADIUS sessions\n");
+               LOG(1, s, session[s].tunnel, "No free RADIUS sessions\n");
                STAT(radius_overflow);
                return 0;
        };
 
        memset(&radius[r], 0, sizeof(radius[r]));
                STAT(radius_overflow);
                return 0;
        };
 
        memset(&radius[r], 0, sizeof(radius[r]));
-       session[s].radius = r;
+       sess_local[s].radius = r;
        radius[r].session = s;
        radius[r].state = RADIUSWAIT;
        radius[r].retry = TIME + 1200; // Wait at least 120 seconds to re-claim this.
 
        radius[r].session = s;
        radius[r].state = RADIUSWAIT;
        radius[r].retry = TIME + 1200; // Wait at least 120 seconds to re-claim this.
 
-       log(3,0,s, session[s].tunnel, "Allocated radius %d\n", r);
+       random_data(radius[r].auth, sizeof(radius[r].auth));
+
+       LOG(3, s, session[s].tunnel, "Allocated radius %d\n", r);
        return r;
 }
 
 // Send a RADIUS request
        return r;
 }
 
 // Send a RADIUS request
-void radiussend(u16 r, u8 state)
+void radiussend(uint16_t r, uint8_t state)
 {
        struct sockaddr_in addr;
 {
        struct sockaddr_in addr;
-       u8 b[4096];            // RADIUS packet
+       uint8_t b[4096];            // RADIUS packet
        char pass[129];
        int pl;
        char pass[129];
        int pl;
-       u8 *p;
+       uint8_t *p;
        sessionidt s;
 
        sessionidt s;
 
-       CSTAT(call_radiussend);
+       CSTAT(radiussend);
 
        s = radius[r].session;
        if (!config->numradiusservers)
        {
 
        s = radius[r].session;
        if (!config->numradiusservers)
        {
-               log(0, 0, s, session[s].tunnel, "No RADIUS servers\n");
+               LOG(0, s, session[s].tunnel, "No RADIUS servers\n");
                return;
        }
        if (!*config->radiussecret)
        {
                return;
        }
        if (!*config->radiussecret)
        {
-               log(0, 0, s, session[s].tunnel, "No RADIUS secret\n");
+               LOG(0, s, session[s].tunnel, "No RADIUS secret\n");
                return;
        }
 
                return;
        }
 
@@ -141,21 +132,23 @@ void radiussend(u16 r, u8 state)
 
        if (radius[r].state != state)
                radius[r].try = 0;
 
        if (radius[r].state != state)
                radius[r].try = 0;
+
        radius[r].state = state;
        radius[r].state = state;
-       radius[r].retry = backoff(radius[r].try++);
-       log(4, 0, s, session[s].tunnel, "Send RADIUS id %d sock %d state %s try %d\n",
-                       r >> RADIUS_SHIFT, r & RADIUS_MASK,
-                       radius_state(radius[r].state), radius[r].try);
+       radius[r].retry = backoff(radius[r].try++) + 20; // 3s, 4s, 6s, 10s...
+       LOG(4, s, session[s].tunnel, "Send RADIUS id %d sock %d state %s try %d\n",
+               r >> RADIUS_SHIFT, r & RADIUS_MASK,
+               radius_state(radius[r].state), radius[r].try);
+
        if (radius[r].try > config->numradiusservers * 2)
        {
                if (s)
                {
                        if (state == RADIUSAUTH)
        if (radius[r].try > config->numradiusservers * 2)
        {
                if (s)
                {
                        if (state == RADIUSAUTH)
-                               sessionshutdown(s, "RADIUS timeout");
+                               sessionshutdown(s, "RADIUS timeout.", 3, 0);
                        else
                        {
                        else
                        {
-                               log(1, 0, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",
-                                       radius_states[state]);
+                               LOG(1, s, session[s].tunnel, "RADIUS timeout, but in state %s so don't timeout session\n",
+                                       radius_state(state));
                                radiusclear(r, s);
                        }
                        STAT(radius_timeout);
                                radiusclear(r, s);
                        }
                        STAT(radius_timeout);
@@ -166,20 +159,21 @@ void radiussend(u16 r, u8 state)
                        radius[r].state = RADIUSWAIT;
                        radius[r].retry = 100;
                }
                        radius[r].state = RADIUSWAIT;
                        radius[r].retry = 100;
                }
-               return ;
+               return;
        }
        // contruct RADIUS access request
        switch (state)
        {
                case RADIUSAUTH:
        }
        // contruct RADIUS access request
        switch (state)
        {
                case RADIUSAUTH:
-                       b[0] = 1;               // access request
+                       b[0] = AccessRequest;               // access request
                        break;
                case RADIUSSTART:
                case RADIUSSTOP:
                        break;
                case RADIUSSTART:
                case RADIUSSTOP:
-                       b[0] = 4;               // accounting request
+               case RADIUSINTERIM:
+                       b[0] = AccountingRequest;               // accounting request
                        break;
                default:
                        break;
                default:
-                       log(0, 0, 0, 0, "Unknown radius state %d\n", state);
+                       LOG(0, 0, 0, "Unknown radius state %d\n", state);
        }
        b[1] = r >> RADIUS_SHIFT;       // identifier
        memcpy(b + 4, radius[r].auth, 16);
        }
        b[1] = r >> RADIUS_SHIFT;       // identifier
        memcpy(b + 4, radius[r].auth, 16);
@@ -240,46 +234,75 @@ void radiussend(u16 r, u8 state)
                        p += p[1];
                }
        }
                        p += p[1];
                }
        }
-       else if (state == RADIUSSTART || state == RADIUSSTOP)
-       {                          // accounting
-               *p = 40;                // accounting type
+       else if (state == RADIUSSTART || state == RADIUSSTOP || state == RADIUSINTERIM)
+       {                       // accounting
+               *p = 40;        // accounting type
                p[1] = 6;
                p[1] = 6;
-               *(u32 *) (p + 2) = htonl((state == RADIUSSTART) ? 1 : 2);
+               *(uint32_t *) (p + 2) = htonl(state - RADIUSSTART + 1); // start=1, stop=2, interim=3
                p += p[1];
                if (s)
                {
                p += p[1];
                if (s)
                {
-                       *p = 44;           // session ID
+                       *p = 44;        // session ID
                        p[1] = 18;
                        p[1] = 18;
-                       sprintf(p + 2, "%08X%08X", session[s].id, session[s].opened);
+                       sprintf(p + 2, "%08X%08X", session[s].unique_id, session[s].opened);
                        p += p[1];
                        p += p[1];
-                       if (state == RADIUSSTOP)
-                       {                // stop
-                               *p = 42;      // input octets
+                       if (state == RADIUSSTART)
+                       {                       // start
+                               *p = 41;        // delay
                                p[1] = 6;
                                p[1] = 6;
-                               *(u32 *) (p + 2) = htonl(session[s].cin);
+                               *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
                                p += p[1];
                                p += p[1];
-                               *p = 43;      // output octets
+                               sess_local[s].last_interim = time_now; // Setup "first" Interim
+                       }
+                       else
+                       {                       // stop, interim
+                               *p = 42;        // input octets
                                p[1] = 6;
                                p[1] = 6;
-                               *(u32 *) (p + 2) = htonl(session[s].cout);
+                               *(uint32_t *) (p + 2) = htonl(session[s].cin);
                                p += p[1];
                                p += p[1];
-                               *p = 46;      // session time
+
+                               *p = 43;        // output octets
                                p[1] = 6;
                                p[1] = 6;
-                               *(u32 *) (p + 2) = htonl(time(NULL) - session[s].opened);
+                               *(uint32_t *) (p + 2) = htonl(session[s].cout);
                                p += p[1];
                                p += p[1];
-                               *p = 47;      // input packets
+                               if (state == RADIUSSTOP)
+                               {
+                                       *p = 46;        // session time
+                                       p[1] = 6;
+                                       *(uint32_t *) (p + 2) = htonl(time(NULL) - session[s].opened);
+                                       p += p[1];
+                               }
+
+                               *p = 47;        // input packets
                                p[1] = 6;
                                p[1] = 6;
-                               *(u32 *) (p + 2) = htonl(session[s].pin);
+                               *(uint32_t *) (p + 2) = htonl(session[s].pin);
                                p += p[1];
                                p += p[1];
-                               *p = 48;      // output spackets
+
+                               *p = 48;        // output packets
                                p[1] = 6;
                                p[1] = 6;
-                               *(u32 *) (p + 2) = htonl(session[s].pout);
+                               *(uint32_t *) (p + 2) = htonl(session[s].pout);
                                p += p[1];
                                p += p[1];
-                       }
-                       else
-                       {                // start
-                               *p = 41;      // delay
+
+                               *p = 52;        // input gigawords
+                               p[1] = 6;
+                               *(uint32_t *) (p + 2) = htonl(session[s].cin_wrap);
+                               p += p[1];
+
+                               *p = 53;        // output gigawords
                                p[1] = 6;
                                p[1] = 6;
-                               *(u32 *) (p + 2) = htonl(time(NULL) - session[s].opened);
+                               *(uint32_t *) (p + 2) = htonl(session[s].cout_wrap);
+                               p += p[1];
+                       }
+
+                       if (session[s].snoop_ip && session[s].snoop_port)
+                       {
+                               *p = 26;                                // vendor-specific
+                               *(uint32_t *) (p + 2) = htonl(9);       // Cisco
+                               p[6] = 1;                               // Cisco-AVPair
+                               p[7] = 2 + sprintf(p + 8, "intercept=%s:%d",
+                                       fmtaddr(session[s].snoop_ip, 0), session[s].snoop_port);
+
+                               p[1] = p[7] + 6;
                                p += p[1];
                        }
                }
                                p += p[1];
                        }
                }
@@ -288,14 +311,14 @@ void radiussend(u16 r, u8 state)
        {
                *p = 5; // NAS-Port
                p[1] = 6;
        {
                *p = 5; // NAS-Port
                p[1] = 6;
-               *(u32 *) (p + 2) = htonl(s);
+               *(uint32_t *) (p + 2) = htonl(s);
                p += p[1];
        }
        if (s && session[s].ip)
        {
                *p = 8;                 // Framed-IP-Address
                p[1] = 6;
                p += p[1];
        }
        if (s && session[s].ip)
        {
                *p = 8;                 // Framed-IP-Address
                p[1] = 6;
-               *(u32 *) (p + 2) = htonl(session[s].ip);
+               *(uint32_t *) (p + 2) = htonl(session[s].ip);
                p += p[1];
        }
        if (*session[s].called)
                p += p[1];
        }
        if (*session[s].called)
@@ -322,11 +345,11 @@ void radiussend(u16 r, u8 state)
        // NAS-IP-Address
        *p = 4;
        p[1] = 6;
        // NAS-IP-Address
        *p = 4;
        p[1] = 6;
-       *(u32 *)(p + 2) = config->bind_address;
+       *(uint32_t *)(p + 2) = config->bind_address;
        p += p[1];
 
        // All AVpairs added
        p += p[1];
 
        // All AVpairs added
-       *(u16 *) (b + 2) = htons(p - b);
+       *(uint16_t *) (b + 2) = htons(p - b);
        if (state != RADIUSAUTH)
        {
            // Build auth for accounting packet
        if (state != RADIUSAUTH)
        {
            // Build auth for accounting packet
@@ -344,51 +367,99 @@ void radiussend(u16 r, u8 state)
        }
        memset(&addr, 0, sizeof(addr));
        addr.sin_family = AF_INET;
        }
        memset(&addr, 0, sizeof(addr));
        addr.sin_family = AF_INET;
-       *(u32 *) & addr.sin_addr = config->radiusserver[(radius[r].try - 1) % config->numradiusservers];
-       addr.sin_port = htons((state == RADIUSAUTH) ? RADPORT : RADAPORT);
+       *(uint32_t *) & addr.sin_addr = config->radiusserver[(radius[r].try - 1) % config->numradiusservers];
+       {
+               // get radius port
+               uint16_t port = config->radiusport[(radius[r].try - 1) % config->numradiusservers];
+               // assume RADIUS accounting port is the authentication port +1
+               addr.sin_port = htons((state == RADIUSAUTH) ? port : port+1);
+       }
 
 
-       log_hex(5, "RADIUS Send", b, (p - b));
+       LOG_HEX(5, "RADIUS Send", b, (p - b));
        sendto(radfds[r & RADIUS_MASK], b, p - b, 0, (void *) &addr, sizeof(addr));
 }
 
        sendto(radfds[r & RADIUS_MASK], b, p - b, 0, (void *) &addr, sizeof(addr));
 }
 
+static void handle_avpair(sessionidt s, uint8_t *avp, int len)
+{
+       char *key = avp;
+       char *value = memchr(avp, '=', len);
+       char tmp[2048] = "";
+
+       if (value)
+       {
+               *value++ = 0;
+               len -= value - key;
+       }
+       else
+       {
+               value = tmp;
+               len = 0;
+       }
+
+       // strip quotes
+       if (len > 2 && (*value == '"' || *value == '\'') && value[len - 1] == *value)
+       {
+               value++;
+               len--;
+               value[len - 1] = 0;
+       }
+       // copy and null terminate
+       else if (len < sizeof(tmp) - 1)
+       {
+               memcpy(tmp, value, len);
+               tmp[len] = 0;
+               value = tmp;
+       }
+       else
+               return;
+       
+       // Run hooks
+       {
+               struct param_radius_response p = { &tunnel[session[s].tunnel], &session[s], key, value };
+               run_plugins(PLUGIN_RADIUS_RESPONSE, &p);
+       }
+}
+
 // process RADIUS response
 // process RADIUS response
-void processrad(u8 *buf, int len, char socket_index)
+void processrad(uint8_t *buf, int len, char socket_index)
 {
 {
-       u8 b[MAXCONTROL];
+       uint8_t b[MAXCONTROL];
        MD5_CTX ctx;
        MD5_CTX ctx;
-       u16 r;
+       uint16_t r;
        sessionidt s;
        tunnelidt t = 0;
        hasht hash;
        sessionidt s;
        tunnelidt t = 0;
        hasht hash;
-       u8 routes = 0;
-
-       int r_code, r_id ; // Radius code.
-
-       r_code = buf[0]; // First byte in radius packet.
-       r_id = buf[1]; // radius reply indentifier.
-
+       uint8_t routes = 0;
+       int r_code;
+       int r_id;
 
 
-       CSTAT(call_processrad);
+       CSTAT(processrad);
 
 
-       log_hex(5, "RADIUS Response", buf, len);
-       if (len < 20 || len < ntohs(*(u16 *) (buf + 2)))
+       LOG_HEX(5, "RADIUS Response", buf, len);
+       if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2)))
        {
        {
-               log(1, 0, 0, 0, "Duff RADIUS response length %d\n", len);
+               LOG(1, 0, 0, "Duff RADIUS response length %d\n", len);
                return ;
        }
                return ;
        }
-       len = ntohs(*(u16 *) (buf + 2));
+
+       r_code = buf[0]; // response type
+       r_id = buf[1]; // radius reply indentifier.
+
+       len = ntohs(*(uint16_t *) (buf + 2));
        r = socket_index | (r_id << RADIUS_SHIFT);
        s = radius[r].session;
        r = socket_index | (r_id << RADIUS_SHIFT);
        s = radius[r].session;
-       log(3, 0, s, session[s].tunnel, "Received %s, radius %d response for session %u (code %d, id %d)\n",
-                       radius_states[radius[r].state], r, s, r_code, r_id);
+       LOG(3, s, session[s].tunnel, "Received %s, radius %d response for session %u (%s, id %d)\n",
+                       radius_state(radius[r].state), r, s, radius_code(r_code), r_id);
+
        if (!s && radius[r].state != RADIUSSTOP)
        {
        if (!s && radius[r].state != RADIUSSTOP)
        {
-               log(1, 0, s, session[s].tunnel, "   Unexpected RADIUS response\n");
+               LOG(1, s, session[s].tunnel, "   Unexpected RADIUS response\n");
                return;
        }
                return;
        }
-       if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSSTART && radius[r].state != RADIUSSTOP)
+       if (radius[r].state != RADIUSAUTH && radius[r].state != RADIUSSTART
+           && radius[r].state != RADIUSSTOP && radius[r].state != RADIUSINTERIM)
        {
        {
-               log(1, 0, s, session[s].tunnel, "   Unexpected RADIUS response\n");
+               LOG(1, s, session[s].tunnel, "   Unexpected RADIUS response\n");
                return;
        }
        t = session[s].tunnel;
                return;
        }
        t = session[s].tunnel;
@@ -401,98 +472,108 @@ void processrad(u8 *buf, int len, char socket_index)
        do {
                if (memcmp(hash, buf + 4, 16))
                {
        do {
                if (memcmp(hash, buf + 4, 16))
                {
-                       log(0, 0, s, session[s].tunnel, "   Incorrect auth on RADIUS response!! (wrong secret in radius config?)\n");
+                       LOG(0, s, session[s].tunnel, "   Incorrect auth on RADIUS response!! (wrong secret in radius config?)\n");
                        return; // Do nothing. On timeout, it will try the next radius server.
                }
                        return; // Do nothing. On timeout, it will try the next radius server.
                }
-               if ((radius[r].state == RADIUSAUTH && *buf != 2 && *buf != 3) ||
-                       ((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP) && *buf != 5))
+
+               if ((radius[r].state == RADIUSAUTH && r_code != AccessAccept && r_code != AccessReject) ||
+                       ((radius[r].state == RADIUSSTART || radius[r].state == RADIUSSTOP || radius[r].state == RADIUSINTERIM) && r_code != AccountingResponse))
                {
                {
-                       log(1, 0, s, session[s].tunnel, "   Unexpected RADIUS response %d\n", *buf);
+                       LOG(1, s, session[s].tunnel, "   Unexpected RADIUS response %s\n", radius_code(r_code));
                        return; // We got something we didn't expect. Let the timeouts take
                                // care off finishing the radius session if that's really correct.
                }
                        return; // We got something we didn't expect. Let the timeouts take
                                // care off finishing the radius session if that's really correct.
                }
+
                if (radius[r].state == RADIUSAUTH)
                {
                if (radius[r].state == RADIUSAUTH)
                {
-                       log(4, 0, s, session[s].tunnel, "   Original response is \"%s\"\n", (*buf == 2) ? "accept" : "reject");
+                       // run post-auth plugin
+                       struct param_post_auth packet = {
+                               &tunnel[t],
+                               &session[s],
+                               session[s].user,
+                               (r_code == AccessAccept),
+                               radius[r].chap ? PPPCHAP : PPPPAP
+                       };
+
+                       run_plugins(PLUGIN_POST_AUTH, &packet);
+                       r_code = packet.auth_allowed ? AccessAccept : AccessReject;
+
                        // process auth response
                        if (radius[r].chap)
                        {
                                // CHAP
                        // process auth response
                        if (radius[r].chap)
                        {
                                // CHAP
-                               u8 *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP);
-                               if (!p) {
-                                       return; // Abort!
-                               }
-                               {
-                                       struct param_post_auth packet = { &tunnel[t], &session[s], session[s].user, (*buf == 2), PPPCHAP };
-                                       run_plugins(PLUGIN_POST_AUTH, &packet);
-                                       *buf = packet.auth_allowed ? 2 : 3;
-                               }
+                               uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPCHAP);
+                               if (!p) return; // Abort!
 
 
-                               log(3, 0, s, session[s].tunnel, "   CHAP User %s authentication %s.\n", session[s].user,
-                                               (*buf == 2) ? "allowed" : "denied");
-                               *p = (*buf == 2) ? 3 : 4;     // ack/nak
+                               *p = (r_code == AccessAccept) ? 3 : 4;     // ack/nak
                                p[1] = radius[r].id;
                                p[1] = radius[r].id;
-                               *(u16 *) (p + 2) = ntohs(4); // no message
+                               *(uint16_t *) (p + 2) = ntohs(4); // no message
                                tunnelsend(b, (p - b) + 4, t); // send it
                                tunnelsend(b, (p - b) + 4, t); // send it
+
+                               LOG(3, s, session[s].tunnel, "   CHAP User %s authentication %s.\n", session[s].user,
+                                               (r_code == AccessAccept) ? "allowed" : "denied");
                        }
                        else
                        {
                                // PAP
                        }
                        else
                        {
                                // PAP
-                               u8 *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP);
-                               if (!p)
-                                       return;         // Abort!
-
-                               {
-                                       struct param_post_auth packet = { &tunnel[t], &session[s], session[s].user, (*buf == 2), PPPPAP };
-                                       run_plugins(PLUGIN_POST_AUTH, &packet);
-                                       *buf = packet.auth_allowed ? 2 : 3;
-                               }
+                               uint8_t *p = makeppp(b, sizeof(b), 0, 0, t, s, PPPPAP);
+                               if (!p) return;         // Abort!
 
 
-                               log(3, 0, s, session[s].tunnel, "   PAP User %s authentication %s.\n", session[s].user,
-                                               (*buf == 2) ? "allowed" : "denied");
                                // ack/nak
                                // ack/nak
-                               *p = *buf;
+                               *p = r_code;
                                p[1] = radius[r].id;
                                p[1] = radius[r].id;
-                               *(u16 *) (p + 2) = ntohs(5);
+                               *(uint16_t *) (p + 2) = ntohs(5);
                                p[4] = 0; // no message
                                tunnelsend(b, (p - b) + 5, t); // send it
                                p[4] = 0; // no message
                                tunnelsend(b, (p - b) + 5, t); // send it
+
+                               LOG(3, s, session[s].tunnel, "   PAP User %s authentication %s.\n", session[s].user,
+                                               (r_code == AccessAccept) ? "allowed" : "denied");
                        }
 
                        }
 
-                       if (*buf == 2)
+                       if (r_code == AccessAccept)
                        {
                                // Login successful
                                // Extract IP, routes, etc
                        {
                                // Login successful
                                // Extract IP, routes, etc
-                               u8 *p = buf + 20;
-                               u8 *e = buf + len;
-                               for (p = buf + 20; p < e && p[1]; p += p[1])
+                               uint8_t *p = buf + 20;
+                               uint8_t *e = buf + len;
+                               for (; p + 2 <= e && p[1] && p + p[1] <= e; p += p[1])
                                {
                                        if (*p == 8)
                                        {
                                {
                                        if (*p == 8)
                                        {
-                                               // Statically assigned address
-                                               log(3, 0, s, session[s].tunnel, "   Radius reply contains IP address %s\n", inet_toa(*(u32 *) (p + 2)));
-                                               session[s].ip = ntohl(*(u32 *) (p + 2));
+                                               // Framed-IP-Address
+                                               if (p[1] < 6) continue;
+                                               session[s].ip = ntohl(*(uint32_t *) (p + 2));
                                                session[s].ip_pool_index = -1;
                                                session[s].ip_pool_index = -1;
+                                               LOG(3, s, session[s].tunnel, "   Radius reply contains IP address %s\n",
+                                                       fmtaddr(htonl(session[s].ip), 0));
+
+                                               if (session[s].ip == 0xFFFFFFFE)
+                                                       session[s].ip = 0; // assign from pool
                                        }
                                        else if (*p == 135)
                                        {
                                                // DNS address
                                        }
                                        else if (*p == 135)
                                        {
                                                // DNS address
-                                               log(3, 0, s, session[s].tunnel, "   Radius reply contains primary DNS address %s\n", inet_toa(*(u32 *) (p + 2)));
-                                               session[s].dns1 = ntohl(*(u32 *) (p + 2));
+                                               if (p[1] < 6) continue;
+                                               session[s].dns1 = ntohl(*(uint32_t *) (p + 2));
+                                               LOG(3, s, session[s].tunnel, "   Radius reply contains primary DNS address %s\n",
+                                                       fmtaddr(htonl(session[s].dns1), 0));
                                        }
                                        else if (*p == 136)
                                        {
                                                // DNS address
                                        }
                                        else if (*p == 136)
                                        {
                                                // DNS address
-                                               log(3, 0, s, session[s].tunnel, "   Radius reply contains secondary DNS address %s\n", inet_toa(*(u32 *) (p + 2)));
-                                               session[s].dns2 = ntohl(*(u32 *) (p + 2));
+                                               if (p[1] < 6) continue;
+                                               session[s].dns2 = ntohl(*(uint32_t *) (p + 2));
+                                               LOG(3, s, session[s].tunnel, "   Radius reply contains secondary DNS address %s\n",
+                                                       fmtaddr(htonl(session[s].dns2), 0));
                                        }
                                        else if (*p == 22)
                                        {
                                        }
                                        else if (*p == 22)
                                        {
-                                               // framed-route
-                                               ipt ip = 0, mask = 0;
-                                               u8 u = 0;
-                                               u8 bits = 0;
-                                               u8 *n = p + 2;
-                                               u8 *e = p + p[1];
+                                               // Framed-Route
+                                               in_addr_t ip = 0, mask = 0;
+                                               uint8_t u = 0;
+                                               uint8_t bits = 0;
+                                               uint8_t *n = p + 2;
+                                               uint8_t *e = p + p[1];
                                                while (n < e && (isdigit(*n) || *n == '.'))
                                                {
                                                        if (*n == '.')
                                                while (n < e && (isdigit(*n) || *n == '.'))
                                                {
                                                        if (*n == '.')
@@ -518,94 +599,134 @@ void processrad(u8 *buf, int len, char socket_index)
                                                        mask = 0xFFFF0000;
                                                else
                                                        mask = 0xFFFFFF00;
                                                        mask = 0xFFFF0000;
                                                else
                                                        mask = 0xFFFFFF00;
+
                                                if (routes == MAXROUTE)
                                                {
                                                if (routes == MAXROUTE)
                                                {
-                                                       log(1, 0, s, session[s].tunnel, "   Too many routes\n");
+                                                       LOG(1, s, session[s].tunnel, "   Too many routes\n");
                                                }
                                                else if (ip)
                                                {
                                                }
                                                else if (ip)
                                                {
-                                                       char *ips, *masks;
-                                                       ips = strdup(inet_toa(htonl(ip)));
-                                                       masks = strdup(inet_toa(htonl(mask)));
-                                                       log(3, 0, s, session[s].tunnel, "   Radius reply contains route for %s/%s\n", ips, masks);
-                                                       free(ips);
-                                                       free(masks);
+                                                       LOG(3, s, session[s].tunnel, "   Radius reply contains route for %s/%s\n",
+                                                               fmtaddr(htonl(ip), 0), fmtaddr(htonl(mask), 1));
+                                                       
                                                        session[s].route[routes].ip = ip;
                                                        session[s].route[routes].mask = mask;
                                                        routes++;
                                                }
                                        }
                                                        session[s].route[routes].ip = ip;
                                                        session[s].route[routes].mask = mask;
                                                        routes++;
                                                }
                                        }
-                                       else if (*p == 26)
+                                       else if (*p == 11)
+                                       {
+                                               // Filter-Id
+                                               char *filter = p + 2;
+                                               int l = p[1] - 2;
+                                               char *suffix;
+                                               int f;
+                                               uint8_t *fp = 0;
+
+                                               LOG(3, s, session[s].tunnel, "   Radius reply contains Filter-Id \"%.*s\"\n", l, filter);
+                                               if ((suffix = memchr(filter, '.', l)))
+                                               {
+                                                       int b = suffix - filter;
+                                                       if (l - b == 3 && !memcmp("in", suffix+1, 2))
+                                                               fp = &session[s].filter_in;
+                                                       else if (l - b == 4 && !memcmp("out", suffix+1, 3))
+                                                               fp = &session[s].filter_out;
+
+                                                       l = b;
+                                               }
+
+                                               if (!fp)
+                                               {
+                                                       LOG(3, s, session[s].tunnel, "    Invalid filter\n");
+                                                       continue;
+                                               }
+
+                                               if ((f = find_filter(filter, l)) < 0 || !*ip_filters[f].name)
+                                               {
+                                                       LOG(3, s, session[s].tunnel, "    Unknown filter\n");
+                                               }
+                                               else
+                                               {
+                                                       *fp = f + 1;
+                                                       ip_filters[f].used++;
+                                               }
+                                       }
+                                       else if (*p == 26 && p[1] >= 7)
                                        {
                                                // Vendor-Specific Attribute
                                                int vendor = ntohl(*(int *)(p + 2));
                                                char attrib = *(p + 6);
                                        {
                                                // Vendor-Specific Attribute
                                                int vendor = ntohl(*(int *)(p + 2));
                                                char attrib = *(p + 6);
-                                               char attrib_length = *(p + 7) - 2;
-                                               log(3, 0, s, session[s].tunnel, "   Radius reply contains Vendor-Specific. Vendor=%d Attrib=%d Length=%d\n", vendor, attrib, attrib_length);
-                                               if (attrib_length == 0) continue;
-                                               if (attrib != 1)
-                                                       log(3, 0, s, session[s].tunnel, "      Unknown vendor-specific\n");
-                                               else
+                                               int attrib_length = *(p + 7) - 2;
+
+                                               LOG(3, s, session[s].tunnel, "   Radius reply contains Vendor-Specific.  Vendor=%d Attrib=%d Length=%d\n", vendor, attrib, attrib_length);
+                                               if (vendor != 9 || attrib != 1)
                                                {
                                                {
-                                                       char *avpair, *value, *key, *newp;
-                                                       avpair = key = calloc(attrib_length + 1, 1);
-                                                       memcpy(avpair, p + 8, attrib_length);
-                                                       log(3, 0, s, session[s].tunnel, "      Cisco-Avpair value: %s\n", avpair);
-                                                       do {
-                                                               value = strchr(key, '=');
-                                                               if (!value) break;
-                                                               *value++ = 0;
-
-                                                               // Trim quotes off reply string
-                                                               if (*value == '\'' || *value == '\"')
-                                                               {
-                                                                       char *x;
-                                                                       value++;
-                                                                       x = value + strlen(value) - 1;
-                                                                       if (*x == '\'' || *x == '\"')
-                                                                               *x = 0;
-                                                               }
-
-                                                               // Run hooks
-                                                               newp = strchr(value, ',');
-                                                               if (newp) *newp++ = 0;
-                                                               {
-                                                                       struct param_radius_response p = { &tunnel[session[s].tunnel], &session[s], key, value };
-                                                                       run_plugins(PLUGIN_RADIUS_RESPONSE, &p);
-                                                               }
-                                                               key = newp;
-                                                       } while (newp);
-                                                       free(avpair);
+                                                       LOG(3, s, session[s].tunnel, "      Unknown vendor-specific\n");
+                                                       continue;
+                                               }
+
+                                               if (attrib_length > 0)
+                                               {
+                                                       LOG(3, s, session[s].tunnel, "      Cisco-AVPair value: %.*s\n",
+                                                               attrib_length, p + 8);
+
+                                                       handle_avpair(s, p + 8, attrib_length);
+                                               }
+                                       }
+                                       else if (*p == 99)
+                                       {
+                                               // Framed-IPv6-Route
+                                               struct in6_addr r6;
+                                               int prefixlen;
+                                               uint8_t *n = p + 2;
+                                               uint8_t *e = p + p[1];
+                                               uint8_t *m = strchr(n, '/');
+
+                                               *m++ = 0;
+                                               inet_pton(AF_INET6, n, &r6);
+
+                                               prefixlen = 0;
+                                               while (m < e && isdigit(*m)) {
+                                                       prefixlen = prefixlen * 10 + *m++ - '0';
+                                               }
+
+                                               if (prefixlen)
+                                               {
+                                                       LOG(3, s, session[s].tunnel,
+                                                               "   Radius reply contains route for %s/%d\n",
+                                                               n, prefixlen);
+                                                       session[s].ipv6route = r6;
+                                                       session[s].ipv6prefixlen = prefixlen;
                                                }
                                        }
                                }
                        }
                                                }
                                        }
                                }
                        }
-                       else if (*buf == 3)
+                       else if (r_code == AccessReject)
                        {
                        {
-                               log(2, 0, s, session[s].tunnel, "   Authentication denied for %s\n", session[s].user);
-//FIXME: We should tear down the session here!
+                               LOG(2, s, session[s].tunnel, "   Authentication rejected for %s\n", session[s].user);
+                               sessionkill(s, "Authentication rejected");
                                break;
                        }
 
                        if (!session[s].dns1 && config->default_dns1)
                        {
                                session[s].dns1 = htonl(config->default_dns1);
                                break;
                        }
 
                        if (!session[s].dns1 && config->default_dns1)
                        {
                                session[s].dns1 = htonl(config->default_dns1);
-                               log(3, 0, s, t, "   Sending dns1 = %s\n", inet_toa(config->default_dns1));
+                               LOG(3, s, t, "   Sending dns1 = %s\n", fmtaddr(config->default_dns1, 0));
                        }
                        if (!session[s].dns2 && config->default_dns2)
                        {
                                session[s].dns2 = htonl(config->default_dns2);
                        }
                        if (!session[s].dns2 && config->default_dns2)
                        {
                                session[s].dns2 = htonl(config->default_dns2);
-                               log(3, 0, s, t, "   Sending dns2 = %s\n", inet_toa(config->default_dns2));
+                               LOG(3, s, t, "   Sending dns2 = %s\n", fmtaddr(config->default_dns2, 0));
                        }
 
                        // Valid Session, set it up
                        }
 
                        // Valid Session, set it up
-                       session[s].sid = 0;
+                       session[s].unique_id = 0;
                        sessionsetup(t, s);
                }
                else
                {
                                // An ack for a stop or start record.
                        sessionsetup(t, s);
                }
                else
                {
                                // An ack for a stop or start record.
-                       log(3, 0, s, t, "   RADIUS accounting ack recv in state %s\n", radius_states[radius[r].state]);
+                       LOG(3, s, t, "   RADIUS accounting ack recv in state %s\n", radius_state(radius[r].state));
                        break;
                }
        } while (0);
                        break;
                }
        } while (0);
@@ -615,55 +736,357 @@ void processrad(u8 *buf, int len, char socket_index)
 }
 
 // Send a retry for RADIUS/CHAP message
 }
 
 // Send a retry for RADIUS/CHAP message
-void radiusretry(u16 r)
+void radiusretry(uint16_t r)
 {
        sessionidt s = radius[r].session;
        tunnelidt t = 0;
 
 {
        sessionidt s = radius[r].session;
        tunnelidt t = 0;
 
-       CSTAT(call_radiusretry);
+       CSTAT(radiusretry);
+
+       if (s) t = session[s].tunnel;
 
 
-       if (s)
-               t = session[s].tunnel;
-       radius[r].retry = backoff(radius[r].try + 1);
        switch (radius[r].state)
        {
        switch (radius[r].state)
        {
-               case RADIUSCHAP:           // sending CHAP down PPP
+               case RADIUSCHAP:        // sending CHAP down PPP
                        sendchap(t, s);
                        break;
                case RADIUSIPCP:
                        sendchap(t, s);
                        break;
                case RADIUSIPCP:
-                       sendipcp(t, s);         // send IPCP
+                       sendipcp(t, s); // send IPCP
                        break;
                        break;
-               case RADIUSAUTH:           // sending auth to RADIUS server
+               case RADIUSAUTH:        // sending auth to RADIUS server
                        radiussend(r, RADIUSAUTH);
                        break;
                        radiussend(r, RADIUSAUTH);
                        break;
-               case RADIUSSTART:          // sending start accounting to RADIUS server
+               case RADIUSSTART:       // sending start accounting to RADIUS server
                        radiussend(r, RADIUSSTART);
                        break;
                        radiussend(r, RADIUSSTART);
                        break;
-               case RADIUSSTOP:           // sending stop accounting to RADIUS server
+               case RADIUSSTOP:        // sending stop accounting to RADIUS server
                        radiussend(r, RADIUSSTOP);
                        break;
                        radiussend(r, RADIUSSTOP);
                        break;
+               case RADIUSINTERIM:     // sending interim accounting to RADIUS server
+                       radiussend(r, RADIUSINTERIM);
+                       break;
                default:
                default:
-               case RADIUSNULL:           // Not in use
-               case RADIUSWAIT:           // waiting timeout before available, in case delayed reply from RADIUS server
+               case RADIUSNULL:        // Not in use
+               case RADIUSWAIT:        // waiting timeout before available, in case delayed reply from RADIUS server
                        // free up RADIUS task
                        radiusclear(r, s);
                        // free up RADIUS task
                        radiusclear(r, s);
-                       log(3, 0, s, session[s].tunnel, "Freeing up radius session %d\n", r);
+                       LOG(3, s, session[s].tunnel, "Freeing up radius session %d\n", r);
                        break;
        }
 }
 
                        break;
        }
 }
 
-void radius_clean()
+extern int daefd;
+
+void processdae(uint8_t *buf, int len, struct sockaddr_in *addr, int alen)
 {
 {
-       int i;
+       int i, r_code, r_id, length, attribute_length;
+       uint8_t vector[16], hash[16], *packet, attribute;
+       MD5_CTX ctx;
+       char username[MAXUSER] = "";
+       in_addr_t nas = 0;
+       in_addr_t ip = 0;
+       uint32_t port = 0;
+       uint32_t error = 0;
+       sessionidt s = 0;
+       tunnelidt t;
+       int fin = -1;
+       int fout = -1;
+       uint8_t *avpair[64];
+       int avpair_len[sizeof(avpair)/sizeof(*avpair)];
+       int avp = 0;
+       int auth_only = 0;
+       uint8_t *p;
+
+       LOG(3, 0, 0, "DAE request from %s\n", fmtaddr(addr->sin_addr.s_addr, 0));
+
+       // check if DAE is from RADIUS server
+       for (i = 0; i < config->numradiusservers; i++)
+               if (config->radiusserver[i] == addr -> sin_addr.s_addr)
+                       break;
+
+       if (i >= config->numradiusservers)
+       {
+               LOG(1, 0, 0, "Unknown DAE client %s\n", fmtaddr(addr->sin_addr.s_addr, 0));
+               return;
+       }
+
+       LOG_HEX(5, "DAE Request", buf, len);
+
+       if (len < 20 || len < ntohs(*(uint16_t *) (buf + 2)))
+       {
+               LOG(1, 0, 0, "Duff DAE request length %d\n", len);
+               return;
+       }
+
+       r_code = buf[0]; // request type
+       r_id = buf[1]; // radius indentifier.
 
 
-       log(1, 0, 0, 0, "Cleaning radius session array\n");
+       if (r_code != DisconnectRequest && r_code != CoARequest)
+       {
+               LOG(1, 0, 0, "Unrecognised DAE request %s\n", radius_code(r_code));
+               return;
+       }
 
 
-       for (i = 1; i < MAXRADIUS; i++)
+       if (!config->cluster_iam_master)
+       {
+               master_forward_dae_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
+               return;
+       }
+
+       len = ntohs(*(uint16_t *) (buf + 2));
+
+       LOG(3, 0, 0, "Received DAE %s, id %d\n", radius_code(r_code), r_id);
+
+       // check authenticator
+       memcpy(vector, buf + 4, 16);
+       memset(buf + 4, 0, 16);
+
+       i = strlen(config->radiussecret);
+       if (i > 16) i = 16;
+
+       MD5Init(&ctx);
+       MD5Update(&ctx, buf, len);
+       MD5Update(&ctx, buf, config->radiussecret, i);
+       MD5Final(hash, &ctx);
+       if (memcmp(hash, vector, 16) != 0)
        {
        {
-               if (radius[i].retry == 0
-                               || !session[radius[i].session].opened
-                               || session[radius[i].session].die
-                               || session[radius[i].session].tunnel == 0)
-                       radiusclear(i, radius[i].session);
+               LOG(1, 0, 0, "Incorrect vector in DAE request (wrong secret in radius config?)\n");
+               return;
+       }
+
+       // unpack attributes
+       packet = buf + 20;
+       length = len - 20;
+
+       while (length > 0)
+       {
+               attribute = *packet++;
+               attribute_length = *packet++;
+               if (attribute_length < 2)
+                       break;
+
+               length -= attribute_length;
+               attribute_length -= 2;
+               switch (attribute)
+               {
+               case 1: /* username */
+                       len = attribute_length < MAXUSER ? attribute_length : MAXUSER - 1;
+                       memcpy(username, packet, len);
+                       username[len] = 0;
+                       LOG(4, 0, 0, "    Received DAE User-Name: %s\n", username);
+                       break;
+
+               case 4: /* nas ip address */
+                       nas = *(uint32_t *) packet; // net order
+                       if (nas != config->bind_address)
+                               error = 403; // NAS identification mismatch
+
+                       LOG(4, 0, 0, "    Received DAE NAS-IP-Address: %s\n", fmtaddr(nas, 0));
+                       break;
+
+               case 5: /* nas port */
+                       port = ntohl(*(uint32_t *) packet);
+                       if (port < 1 || port > MAXSESSION)
+                               error = 404;
+
+                       LOG(4, 0, 0, "    Received DAE NAS-Port: %u\n", port);
+                       break;
+
+               case 6: /* service type */
+                       {
+                               uint32_t service_type = ntohl(*(uint32_t *) packet);
+                               auth_only = service_type == 8; // Authenticate only
+
+                               LOG(4, 0, 0, "    Received DAE Service-Type: %u\n", service_type);
+                       }
+                       break;
+
+               case 8: /* ip address */
+                       ip = *(uint32_t *) packet; // net order
+                       LOG(4, 0, 0, "    Received DAE Framed-IP-Address: %s\n", fmtaddr(ip, 0));
+                       break;
+
+               case 11: /* filter id */
+                       LOG(4, 0, 0, "    Received DAE Filter-Id: %.*s\n", attribute_length, packet);
+                       if (!(p = memchr(packet, '.', attribute_length)))
+                       {
+                               error = 404; // invalid request
+                               break;
+                       }
+
+                       len = p - packet;
+                       i = find_filter(packet, len);
+                       if (i < 0 || !*ip_filters[i].name)
+                       {
+                               error = 404;
+                               break;
+                       }
+
+                       if (!memcmp(p, ".in", attribute_length - len))
+                               fin = i + 1;
+                       else if (!memcmp(p, ".out", attribute_length - len))
+                               fout = i + 1;
+                       else
+                               error = 404;
+
+                       break;
+
+               case 26: /* vendor specific */
+                       if (attribute_length >= 6
+                           && ntohl(*(uint32_t *) packet) == 9 // Cisco
+                           && *(packet + 4) == 1               // Cisco-AVPair
+                           && *(packet + 5) >= 2)              // length
+                       {
+                               int len = *(packet + 5) - 2;
+                               uint8_t *a = packet + 6;
+
+                               LOG(4, 0, 0, "    Received DAE Cisco-AVPair: %.*s\n", len, a);
+                               if (avp < sizeof(avpair)/sizeof(*avpair) - 1)
+                               {
+                                       avpair[avp] = a;
+                                       avpair_len[avp++] = len;
+                               }
+                       }
+                       break;
+               }
+
+               packet += attribute_length;
        }
        }
+
+       if (!error && auth_only)
+       {
+               if (fin != -1 || fout != -1 || avp)
+                       error = 401; // unsupported attribute
+               else
+                       error = 405; // unsupported service
+       }
+
+       if (!error && !(port || ip || *username))
+               error = 402; // missing attribute
+
+       // exact match for SID if given
+       if (!error && port)
+       {
+               s = port;
+               if (!session[s].opened)
+                       error = 503; // not found
+       }
+
+       if (!error && ip)
+       {
+               // find/check session by IP
+               i = sessionbyip(ip);
+               if (!i || (s && s != i)) // not found or mismatching port
+                       error = 503;
+               else
+                       s = i;
+       }
+
+       if (!error && *username)
+       {
+               if (s)
+               {
+                       if (strcmp(session[s].user, username))
+                               error = 503;
+               }
+               else if (!(s = sessionbyuser(username)))
+                       error = 503;
+       }
+
+       t = session[s].tunnel;
+
+       switch (r_code)
+       {
+       case DisconnectRequest: // Packet of Disconnect/Death
+               if (error)
+               {
+                       r_code = DisconnectNAK;
+                       break;
+               }
+
+               LOG(3, s, t, "    DAE Disconnect %d (%s)\n", s, session[s].user);
+               r_code = DisconnectACK;
+
+               sessionshutdown(s, "Requested by PoD", 3, 0); // disconnect session
+               break;
+
+       case CoARequest: // Change of Authorization
+               if (error)
+               {
+                       r_code = CoANAK;
+                       break;
+               }
+
+               LOG(3, s, t, "    DAE Change %d (%s)\n", s, session[s].user);
+               r_code = CoAACK;
+       
+               // reset
+               {
+                       struct param_radius_reset p = { &tunnel[session[s].tunnel], &session[s] };
+                       run_plugins(PLUGIN_RADIUS_RESET, &p);
+               }
+
+               // apply filters
+               if (fin != -1 || fout != -1)
+               {
+                       if (fin == -1)
+                               fin = 0;
+                       else
+                               LOG(3, s, t, "        Filter in %d (%s)\n", fin, ip_filters[fin - 1].name);
+
+                       if (fout == -1)
+                               fout = 0;
+                       else
+                               LOG(3, s, t, "        Filter out %d (%s)\n", fout, ip_filters[fout - 1].name);
+
+                       filter_session(s, fin, fout);
+               }
+
+               // process cisco av-pair(s)
+               for (i = 0; i < avp; i++)
+               {
+                       LOG(3, s, t, "        Cisco-AVPair: %.*s\n", avpair_len[i], avpair[i]);
+                       handle_avpair(s, avpair[i], avpair_len[i]);
+               }
+
+               cluster_send_session(s);
+               break;
+       }
+
+       // send response
+       packet = buf;
+       *packet++ = r_code;
+       *packet++ = r_id;
+       packet += 2;
+       memset(packet, 0, 16);
+       packet += 16;
+       len = 20;
+
+       // add attributes
+       if (error)
+       {
+               // add error cause
+               *packet++ = 101;
+               *packet++ = 6;
+               *(uint32_t *) packet = htonl(error);
+               len += 6;
+       }
+
+       *((uint16_t *)(buf + 2)) = htons(len);
+
+       // make vector
+       i = strlen(config->radiussecret);
+       if (i > 16) i = 16;
+
+       MD5Init(&ctx);
+       MD5Update(&ctx, buf, len);
+       MD5Update(&ctx, config->radiussecret, i);
+       MD5Final(hash, &ctx);
+       memcpy(buf + 4, hash, 16);
+
+       LOG(3, 0, 0, "Sending DAE %s, id=%d\n", radius_code(r_code), r_id);
+
+       // send DAE response
+       if (sendto(daefd, buf, len, MSG_DONTWAIT | MSG_NOSIGNAL, (struct sockaddr *) addr, alen) < 0)
+               LOG(0, 0, 0, "Error sending DAE response packet: %s\n", strerror(errno));
 }
 }
for cloning use: "git clone git://git.sameswireless.fr/l2tpns.git" ; For add to your sources.list: "deb http://package.sameswifi.fr/ jessie main"