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[l2tpns.git] / l2tpns.c
diff --git a/l2tpns.c b/l2tpns.c
index 1e5b46c..1bcdf1d 100644 (file)
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -4,7 +4,7 @@
 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
 // vim: sw=8 ts=8
 
 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
 // vim: sw=8 ts=8
 
-char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.16 2004-07-26 00:20:41 fred_nerk Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.34 2004-10-29 04:01:11 bodea Exp $";
 
 #include <arpa/inet.h>
 #include <assert.h>
 
 #include <arpa/inet.h>
 #include <assert.h>
@@ -63,7 +63,7 @@ u32 sessionid = 0;            // session id for radius accounting
 int syslog_log = 0;            // are we logging to syslog
 FILE *log_stream = NULL;       // file handle for direct logging (i.e. direct into file, not via syslog).
 extern int cluster_sockfd;     // Intra-cluster communications socket.
 int syslog_log = 0;            // are we logging to syslog
 FILE *log_stream = NULL;       // file handle for direct logging (i.e. direct into file, not via syslog).
 extern int cluster_sockfd;     // Intra-cluster communications socket.
-u32 last_sid = 0;              // Last used PPP SID. Can I kill this?? -- mo
+u32 last_id = 0;               // Last used PPP SID. Can I kill this?? -- mo
 int clifd = 0;                 // Socket listening for CLI connections.
 
 struct cli_session_actions *cli_session_actions = NULL;        // Pending session changes requested by CLI
 int clifd = 0;                 // Socket listening for CLI connections.
 
 struct cli_session_actions *cli_session_actions = NULL;        // Pending session changes requested by CLI
@@ -94,19 +94,21 @@ int bgp_configured = 0;
 struct config_descriptt config_values[] = {
        CONFIG("debug", debug, INT),
        CONFIG("log_file", log_filename, STRING),
 struct config_descriptt config_values[] = {
        CONFIG("debug", debug, INT),
        CONFIG("log_file", log_filename, STRING),
+       CONFIG("pid_file", pid_file, STRING),
        CONFIG("l2tp_secret", l2tpsecret, STRING),
        CONFIG("primary_dns", default_dns1, IP),
        CONFIG("secondary_dns", default_dns2, IP),
        CONFIG("save_state", save_state, BOOL),
        CONFIG("primary_radius", radiusserver[0], IP),
        CONFIG("secondary_radius", radiusserver[1], IP),
        CONFIG("l2tp_secret", l2tpsecret, STRING),
        CONFIG("primary_dns", default_dns1, IP),
        CONFIG("secondary_dns", default_dns2, IP),
        CONFIG("save_state", save_state, BOOL),
        CONFIG("primary_radius", radiusserver[0], IP),
        CONFIG("secondary_radius", radiusserver[1], IP),
-       CONFIG("primary_radius_port",radiusport[0], SHORT),
-       CONFIG("secondary_radius_port",radiusport[1], SHORT),
+       CONFIG("primary_radius_port", radiusport[0], SHORT),
+       CONFIG("secondary_radius_port", radiusport[1], SHORT),
        CONFIG("radius_accounting", radius_accounting, BOOL),
        CONFIG("radius_secret", radiussecret, STRING),
        CONFIG("bind_address", bind_address, IP),
        CONFIG("send_garp", send_garp, BOOL),
        CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
        CONFIG("radius_accounting", radius_accounting, BOOL),
        CONFIG("radius_secret", radiussecret, STRING),
        CONFIG("bind_address", bind_address, IP),
        CONFIG("send_garp", send_garp, BOOL),
        CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
+       CONFIG("throttle_buckets", num_tbfs, INT),
        CONFIG("accounting_dir", accounting_dir, STRING),
        CONFIG("setuid", target_uid, INT),
        CONFIG("dump_speed", dump_speed, BOOL),
        CONFIG("accounting_dir", accounting_dir, STRING),
        CONFIG("setuid", target_uid, INT),
        CONFIG("dump_speed", dump_speed, BOOL),
@@ -168,6 +170,7 @@ void dump_state();
 void tunnel_clean();
 tunnelidt new_tunnel();
 void update_config();
 void tunnel_clean();
 tunnelidt new_tunnel();
 void update_config();
+int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length);
 
 static void cache_ipmap(ipt ip, int s);
 static void uncache_ipmap(ipt ip);
 
 static void cache_ipmap(ipt ip, int s);
 static void uncache_ipmap(ipt ip);
@@ -537,20 +540,28 @@ int cmd_show_ipcache(struct cli_def *cli, char *command, char **argv, int argc)
        if (CLI_HELP_REQUESTED)
                return CLI_HELP_NO_ARGS;
 
        if (CLI_HELP_REQUESTED)
                return CLI_HELP_NO_ARGS;
 
-        cli_print(cli, "%7s %s", "Sess#", "IP Address");
+       cli_print(cli, "%7s %s", "Sess#", "IP Address");
 
 
-       for (i = 0; i < 256; ++i) {
-               if (!d[i]) continue;
+       for (i = 0; i < 256; ++i)
+       {
+               if (!d[i])
+                       continue;
                e = (char**) d[i];
                e = (char**) d[i];
-               for (j = 0; j < 256; ++j) {
-                       if (!e[j]) continue;
+               for (j = 0; j < 256; ++j)
+               {
+                       if (!e[j])
+                               continue;
                        f = (char**) e[j];
                        f = (char**) e[j];
-                       for (k = 0; k < 256; ++k) {
-                               if (!f[k]) continue;
+                       for (k = 0; k < 256; ++k)
+                       {
+                               if (!f[k])
+                                       continue;
                                g = (char**)f[k];
                                g = (char**)f[k];
-                               for (l = 0; l < 256; ++l) {
-                                       if (!g[l]) continue;
-                                       cli_print(cli, "%7d %d.%d.%d.%d",  (int) g[l], i, j, k, l);
+                               for (l = 0; l < 256; ++l)
+                               {
+                                       if (!g[l])
+                                               continue;
+                                       cli_print(cli, "%7d %d.%d.%d.%d", (int) g[l], i, j, k, l);
                                        ++count;
                                }
                        }
                                        ++count;
                                }
                        }
@@ -572,7 +583,8 @@ sessionidt sessionbyuser(char *username)
        int s;
        CSTAT(call_sessionbyuser);
 
        int s;
        CSTAT(call_sessionbyuser);
 
-       for (s = 1; s < MAXSESSION ; ++s) {
+       for (s = 1; s < MAXSESSION ; ++s)
+       {
                if (session[s].walled_garden)
                        continue;               // Skip walled garden users.
 
                if (session[s].walled_garden)
                        continue;               // Skip walled garden users.
 
@@ -741,7 +753,8 @@ void processipout(u8 * buf, int len)
                static int rate = 0;    // Number of ICMP packets we've sent this second.
                static int last = 0;    // Last time we reset the ICMP packet counter 'rate'.
 
                static int rate = 0;    // Number of ICMP packets we've sent this second.
                static int last = 0;    // Last time we reset the ICMP packet counter 'rate'.
 
-               if (last != time_now) {
+               if (last != time_now)
+               {
                        last = time_now;
                        rate = 0;
                }
                        last = time_now;
                        rate = 0;
                }
@@ -781,7 +794,8 @@ void processipout(u8 * buf, int len)
        // Add on L2TP header
        {
                u8 *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
        // Add on L2TP header
        {
                u8 *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
-               if (!p) {
+               if (!p)
+               {
                        log(3, session[s].ip, s, t, "failed to send packet in processipout.\n");
                        return;
                }
                        log(3, session[s].ip, s, t, "failed to send packet in processipout.\n");
                        return;
                }
@@ -807,7 +821,8 @@ void send_ipout(sessionidt s, u8 *buf, int len)
 
        u8 b[MAXETHER + 20];
 
 
        u8 b[MAXETHER + 20];
 
-       if (len < 0 || len > MAXETHER) {
+       if (len < 0 || len > MAXETHER)
+       {
                log(1,0,0,0, "Odd size IP packet: %d bytes\n", len);
                return;
        }
                log(1,0,0,0, "Odd size IP packet: %d bytes\n", len);
                return;
        }
@@ -832,7 +847,8 @@ void send_ipout(sessionidt s, u8 *buf, int len)
        // Add on L2TP header
        {
                u8 *p = makeppp(b, sizeof(b),  buf, len, t, s, PPPIP);
        // Add on L2TP header
        {
                u8 *p = makeppp(b, sizeof(b),  buf, len, t, s, PPPIP);
-               if (!p) {
+               if (!p)
+               {
                        log(3, session[s].ip, s, t, "failed to send packet in send_ipout.\n");
                        return;
                }
                        log(3, session[s].ip, s, t, "failed to send packet in send_ipout.\n");
                        return;
                }
@@ -959,11 +975,16 @@ int throttle_session(sessionidt s, int throttle)
        if (!session[s].tunnel)
                return 0;       // No-one home.
 
        if (!session[s].tunnel)
                return 0;       // No-one home.
 
-        if (!*session[s].user)
-                return 0; // User not logged in
+       if (!*session[s].user)
+               return 0; // User not logged in
 
 
-       if (throttle) {
-               if (session[s].tbf_in || session[s].tbf_out) {
+       if (throttle)
+       {
+               int rate_in = throttle & 0x0000FFFF;
+               int rate_out = throttle >> 16;
+
+               if (session[s].tbf_in || session[s].tbf_out)
+               {
                        if (throttle == session[s].throttle)
                                return 1;
 
                        if (throttle == session[s].throttle)
                                return 1;
 
@@ -973,10 +994,12 @@ int throttle_session(sessionidt s, int throttle)
                        free_tbf(session[s].tbf_out);
                }
 
                        free_tbf(session[s].tbf_out);
                }
 
-               session[s].tbf_in = new_tbf(s, throttle*1024/4, throttle*1024/8, send_ipin);
-               session[s].tbf_out = new_tbf(s, throttle*1024/4, throttle*1024/8, send_ipout);
+               if (rate_in) session[s].tbf_in = new_tbf(s, rate_in * 1024 / 4, rate_in * 1024 / 8, send_ipin);
+               if (rate_out) session[s].tbf_out = new_tbf(s, rate_out * 1024 / 4, rate_out * 1024 / 8, send_ipout);
 
 
-               if (throttle != session[s].throttle) {  // Changed. Flood to slaves.
+               if (throttle != session[s].throttle)
+               {
+                       // Changed. Flood to slaves.
                        session[s].throttle = throttle;
                        cluster_send_session(s);
                }
                        session[s].throttle = throttle;
                        cluster_send_session(s);
                }
@@ -995,7 +1018,9 @@ int throttle_session(sessionidt s, int throttle)
        free_tbf(session[s].tbf_out);
        session[s].tbf_out = 0;
 
        free_tbf(session[s].tbf_out);
        session[s].tbf_out = 0;
 
-       if (throttle != session[s].throttle) {  // Changed. Flood to slaves.
+       if (throttle != session[s].throttle)
+       {
+               // Changed. Flood to slaves.
                session[s].throttle = throttle;
                cluster_send_session(s);
        }
                session[s].throttle = throttle;
                cluster_send_session(s);
        }
@@ -1029,7 +1054,8 @@ void sessionshutdown(sessionidt s, char *reason)
        }
 
        // RADIUS Stop message
        }
 
        // RADIUS Stop message
-       if (session[s].opened && !walled_garden && !dead) {
+       if (session[s].opened && !walled_garden && !dead)
+       {
                u16 r = session[s].radius;
                if (!r)
                {
                u16 r = session[s].radius;
                if (!r)
                {
@@ -1104,7 +1130,8 @@ void sendipcp(tunnelidt t, sessionidt s)
        }
 
        q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP);
        }
 
        q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP);
-       if (!q) {
+       if (!q)
+       {
                log(3, session[s].ip, s, t, "failed to send packet in sendipcp.\n");
                return;
        }
                log(3, session[s].ip, s, t, "failed to send packet in sendipcp.\n");
                return;
        }
@@ -1114,7 +1141,7 @@ void sendipcp(tunnelidt t, sessionidt s)
        *(u16 *) (q + 2) = htons(10);
        q[4] = 3;
        q[5] = 6;
        *(u16 *) (q + 2) = htons(10);
        q[4] = 3;
        q[5] = 6;
-       *(u32 *) (q + 6) = config->bind_address; // send my IP
+       *(u32 *) (q + 6) = config->bind_address ? config->bind_address : my_address; // send my IP
        tunnelsend(buf, 10 + (q - buf), t); // send it
        session[s].flags &= ~SF_IPCP_ACKED;     // Clear flag.
 }
        tunnelsend(buf, 10 + (q - buf), t); // send it
        session[s].flags &= ~SF_IPCP_ACKED;     // Clear flag.
 }
@@ -1286,7 +1313,8 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                char called[MAXTEL] = ""; // called number
                char calling[MAXTEL] = ""; // calling number
 
                char called[MAXTEL] = ""; // called number
                char calling[MAXTEL] = ""; // calling number
 
-               if (!config->cluster_iam_master) {
+               if (!config->cluster_iam_master)
+               {
                        master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
                        return;
                }
                        master_forward_packet(buf, len, addr->sin_addr.s_addr, addr->sin_port);
                        return;
                }
@@ -1307,7 +1335,8 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                                //
                                // Is this a duplicate of the first packet? (SCCRQ)
                                //
                                //
                                // Is this a duplicate of the first packet? (SCCRQ)
                                //
-                       for ( i = 1; i <= config->cluster_highest_tunnelid ; ++i) {
+                       for (i = 1; i <= config->cluster_highest_tunnelid ; ++i)
+                       {
                                if (tunnel[i].state != TUNNELOPENING ||
                                        tunnel[i].ip != ntohl(*(ipt *) & addr->sin_addr) ||
                                        tunnel[i].port != ntohs(addr->sin_port) )
                                if (tunnel[i].state != TUNNELOPENING ||
                                        tunnel[i].ip != ntohl(*(ipt *) & addr->sin_addr) ||
                                        tunnel[i].port != ntohs(addr->sin_port) )
@@ -1317,7 +1346,8 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                        }
                }
 
                        }
                }
 
-               if (!t) {
+               if (!t)
+               {
                        if (!(t = new_tunnel()))
                        {
                                log(1, ntohl(addr->sin_addr.s_addr), 0, 0, "No more tunnels\n");
                        if (!(t = new_tunnel()))
                        {
                                log(1, ntohl(addr->sin_addr.s_addr), 0, 0, "No more tunnels\n");
@@ -1424,6 +1454,13 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                                                continue;
                                        }
                                        log(4, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP\n");
                                                continue;
                                        }
                                        log(4, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP\n");
+                                       // Unhide the AVP
+                                       n = unhide_avp(b, t, s, n);
+                                       if (n == 0)
+                                       {
+                                               fatal = flags;
+                                               continue;
+                                       }
                                }
                                if (*b & 0x3C)
                                {
                                }
                                if (*b & 0x3C)
                                {
@@ -1456,17 +1493,21 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                                        {
                                                u16 rescode = ntohs(*(u16 *)(b));
                                                const char* resdesc = "(unknown)";
                                        {
                                                u16 rescode = ntohs(*(u16 *)(b));
                                                const char* resdesc = "(unknown)";
-                                               if (message == 4) { /* StopCCN */
+                                               if (message == 4)
+                                               { /* StopCCN */
                                                        if (rescode <= MAX_STOPCCN_RESULT_CODE)
                                                                resdesc = stopccn_result_codes[rescode];
                                                        if (rescode <= MAX_STOPCCN_RESULT_CODE)
                                                                resdesc = stopccn_result_codes[rescode];
-                                               } else if (message == 14) { /* CDN */
+                                               }
+                                               else if (message == 14)
+                                               { /* CDN */
                                                        if (rescode <= MAX_CDN_RESULT_CODE)
                                                                resdesc = cdn_result_codes[rescode];
                                                }
 
                                                log(4, ntohl(addr->sin_addr.s_addr), s, t, "   Result Code %d: %s\n",
                                                        rescode, resdesc);
                                                        if (rescode <= MAX_CDN_RESULT_CODE)
                                                                resdesc = cdn_result_codes[rescode];
                                                }
 
                                                log(4, ntohl(addr->sin_addr.s_addr), s, t, "   Result Code %d: %s\n",
                                                        rescode, resdesc);
-                                               if (n >= 4) {
+                                               if (n >= 4)
+                                               {
                                                        u16 errcode = ntohs(*(u16 *)(b + 2));
                                                        const char* errdesc = "(unknown)";
                                                        if (errcode <= MAX_ERROR_CODE)
                                                        u16 errcode = ntohs(*(u16 *)(b + 2));
                                                        const char* errdesc = "(unknown)";
                                                        if (errcode <= MAX_ERROR_CODE)
@@ -1534,6 +1575,11 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                                                build_chap_response(b, 2, n, &chapresponse);
                                        }
                                        break;
                                                build_chap_response(b, 2, n, &chapresponse);
                                        }
                                        break;
+                               case 13:    // Response
+                                       // Why did they send a response? We never challenge.
+                                       log(2, ntohl(addr->sin_addr.s_addr), s, t, "   received unexpected challenge response\n");
+                               break;
+
                                case 14:    // assigned session
                                        asession = session[s].far = ntohs(*(u16 *) (b));
                                        log(4, ntohl(addr->sin_addr.s_addr), s, t, "   assigned session = %d\n", asession);
                                case 14:    // assigned session
                                        asession = session[s].far = ntohs(*(u16 *) (b));
                                        log(4, ntohl(addr->sin_addr.s_addr), s, t, "   assigned session = %d\n", asession);
@@ -1559,6 +1605,8 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                                        memcpy(calling, b, (n >= MAXTEL) ? (MAXTEL-1) : n);
                                        log(4, ntohl(addr->sin_addr.s_addr), s, t, "   Calling <%s>\n", calling);
                                        break;
                                        memcpy(calling, b, (n >= MAXTEL) ? (MAXTEL-1) : n);
                                        log(4, ntohl(addr->sin_addr.s_addr), s, t, "   Calling <%s>\n", calling);
                                        break;
+                               case 23:    // subtype
+                                       break;
                                case 24:    // tx connect speed
                                        if (n == 4)
                                        {
                                case 24:    // tx connect speed
                                        if (n == 4)
                                        {
@@ -1777,6 +1825,7 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
                                        // TBA
                                        break;
                                case 12:      // ICCN
                                        // TBA
                                        break;
                                case 12:      // ICCN
+                                       if (amagic == 0) amagic = time_now;
                                        session[s].magic = amagic; // set magic number
                                        session[s].l2tp_flags = aflags; // set flags received
                                        log(3, ntohl(addr->sin_addr.s_addr), s, t, "Magic %X Flags %X\n", amagic, aflags);
                                        session[s].magic = amagic; // set magic number
                                        session[s].l2tp_flags = aflags; // set flags received
                                        log(3, ntohl(addr->sin_addr.s_addr), s, t, "Magic %X Flags %X\n", amagic, aflags);
@@ -2032,7 +2081,7 @@ int regular_cleanups(void)
                if (!session[s].tunnel) // Session isn't in use
                        continue;
 
                if (!session[s].tunnel) // Session isn't in use
                        continue;
 
-               if (!session[s].die && session[s].ip && !(session[s].flags & SF_IPCP_ACKED) )
+               if (!session[s].die && session[s].ip && !(session[s].flags & SF_IPCP_ACKED))
                {
                        // IPCP has not completed yet. Resend
                        log(3, session[s].ip, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n");
                {
                        // IPCP has not completed yet. Resend
                        log(3, session[s].ip, s, session[s].tunnel, "No ACK for initial IPCP ConfigReq... resending\n");
@@ -2062,7 +2111,8 @@ int regular_cleanups(void)
                        u8 b[MAXCONTROL] = {0};
 
                        u8 *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP);
                        u8 b[MAXCONTROL] = {0};
 
                        u8 *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP);
-                       if (!q) {
+                       if (!q)
+                       {
                                log(3, session[s].ip, s, t, "failed to send ECHO packet.\n");
                                continue;
                        }
                                log(3, session[s].ip, s, t, "failed to send ECHO packet.\n");
                                continue;
                        }
@@ -2076,7 +2126,6 @@ int regular_cleanups(void)
                                        (int)(time_now - session[s].last_packet));
                        tunnelsend(b, 24, session[s].tunnel); // send it
                        if (++count >= MAX_ACTIONS) break;
                                        (int)(time_now - session[s].last_packet));
                        tunnelsend(b, 24, session[s].tunnel); // send it
                        if (++count >= MAX_ACTIONS) break;
-                       continue;
                }
 
                // Check for actions requested from the CLI
                }
 
                // Check for actions requested from the CLI
@@ -2112,8 +2161,9 @@ int regular_cleanups(void)
 
                        if (a & CLI_SESS_THROTTLE)
                        {
 
                        if (a & CLI_SESS_THROTTLE)
                        {
-                               log(2, 0, s, session[s].tunnel, "Throttling session by CLI (to %d)\n",
-                                   cli_session_actions[s].throttle);
+                               log(2, 0, s, session[s].tunnel, "Throttling session by CLI (to %dkb/s up and %dkb/s down)\n",
+                                   cli_session_actions[s].throttle & 0xFFFF,
+                                   cli_session_actions[s].throttle >> 16);
 
                                throttle_session(s, cli_session_actions[s].throttle);
                        }
 
                                throttle_session(s, cli_session_actions[s].throttle);
                        }
@@ -2128,11 +2178,10 @@ int regular_cleanups(void)
                                cluster_send_session(s);
 
                        if (++count >= MAX_ACTIONS) break;
                                cluster_send_session(s);
 
                        if (++count >= MAX_ACTIONS) break;
-                       continue;
                }
        }
 
                }
        }
 
-       if (config->accounting_dir && next_acct <= TIME)
+       if (*config->accounting_dir && next_acct <= TIME)
        {
                // Dump accounting data
                next_acct = TIME + ACCT_TIME;
        {
                // Dump accounting data
                next_acct = TIME + ACCT_TIME;
@@ -2154,18 +2203,31 @@ int regular_cleanups(void)
 int still_busy(void)
 {
        int i;
 int still_busy(void)
 {
        int i;
-       static int last_talked = 0;
-       for (i = config->cluster_highest_tunnelid ; i > 0 ; --i) {
+       static clockt last_talked = 0;
+       static clockt start_busy_wait = 0;
+       if (start_busy_wait == 0)
+               start_busy_wait = TIME;
+
+       for (i = config->cluster_highest_tunnelid ; i > 0 ; --i)
+       {
                if (!tunnel[i].controlc)
                        continue;
 
                if (!tunnel[i].controlc)
                        continue;
 
-               if (last_talked != TIME) {
+               if (last_talked != TIME)
+               {
                        log(2,0,0,0, "Tunnel %d still has un-acked control messages.\n", i);
                        last_talked = TIME;
                }
                return 1;
        }
 
                        log(2,0,0,0, "Tunnel %d still has un-acked control messages.\n", i);
                        last_talked = TIME;
                }
                return 1;
        }
 
+       // We stop waiting for radius after BUSY_WAIT_TIMEOUT 1/10th seconds
+       if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIMEOUT)
+       {
+               log(1, 0, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
+               return 0;
+       }
+
        for (i = 1; i < MAXRADIUS; i++)
        {
                if (radius[i].state == RADIUSNULL)
        for (i = 1; i < MAXRADIUS; i++)
        {
                if (radius[i].state == RADIUSNULL)
@@ -2173,7 +2235,8 @@ int still_busy(void)
                if (radius[i].state == RADIUSWAIT)
                        continue;
 
                if (radius[i].state == RADIUSWAIT)
                        continue;
 
-               if (last_talked != TIME) {
+               if (last_talked != TIME)
+               {
                        log(2,0,0,0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session);
                        last_talked = TIME;
                }
                        log(2,0,0,0, "Radius session %d is still busy (sid %d)\n", i, radius[i].session);
                        last_talked = TIME;
                }
@@ -2298,13 +2361,17 @@ void mainloop(void)
                        for (i = 0; i < config->num_radfds; i++)
                                if (FD_ISSET(radfds[i], &r))
                                        processrad(buf, recv(radfds[i], buf, sizeof(buf), 0), i);
                        for (i = 0; i < config->num_radfds; i++)
                                if (FD_ISSET(radfds[i], &r))
                                        processrad(buf, recv(radfds[i], buf, sizeof(buf), 0), i);
-                       if (FD_ISSET(cluster_sockfd, &r)) {
+
+                       if (FD_ISSET(cluster_sockfd, &r))
+                       {
                                int size;
                                size = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen);
                                processcluster(buf, size, addr.sin_addr.s_addr);
                        }
                                int size;
                                size = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen);
                                processcluster(buf, size, addr.sin_addr.s_addr);
                        }
+
                        if (FD_ISSET(controlfd, &r))
                                processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr);
                        if (FD_ISSET(controlfd, &r))
                                processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr);
+
                        if (FD_ISSET(clifd, &r))
                        {
                                struct sockaddr_in addr;
                        if (FD_ISSET(clifd, &r))
                        {
                                struct sockaddr_in addr;
@@ -2348,7 +2415,8 @@ void mainloop(void)
                        // Runs on all machines both master and slave.
                {
                        static clockt last_run = 0;
                        // Runs on all machines both master and slave.
                {
                        static clockt last_run = 0;
-                       if (last_run != TIME) {
+                       if (last_run != TIME)
+                       {
                                last_run = TIME;
                                tbf_run_timer();
                        }
                                last_run = TIME;
                                tbf_run_timer();
                        }
@@ -2358,10 +2426,15 @@ void mainloop(void)
                 * something to read, else under load this will never actually run....
                 *
                 */
                 * something to read, else under load this will never actually run....
                 *
                 */
-               if (config->cluster_iam_master && next_clean <= time_now) {
-                       if (regular_cleanups()) { // Did it finish?
+               if (config->cluster_iam_master && next_clean <= time_now)
+               {
+                       if (regular_cleanups())
+                       {
+                               // Did it finish?
                                next_clean = time_now + 1 ;     // Didn't finish. Check quickly.
                                next_clean = time_now + 1 ;     // Didn't finish. Check quickly.
-                       } else {
+                       }
+                       else
+                       {
                                next_clean = time_now + config->cleanup_interval; // Did. Move to next interval.
                        }
                }
                                next_clean = time_now + config->cleanup_interval; // Did. Move to next interval.
                        }
                }
@@ -2389,78 +2462,75 @@ void mainloop(void)
 }
 
 // Init data structures
 }
 
 // Init data structures
-void initdata(void)
+void initdata(int optdebug, char *optconfig)
 {
        int i;
 
 {
        int i;
 
-       _statistics = mmap(NULL, sizeof(struct Tstats), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
-       if (_statistics == MAP_FAILED)
+       if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
        {
        {
-               log(0, 0, 0, 0, "Error doing mmap for _statistics: %s\n", strerror(errno));
+               log(0, 0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
                exit(1);
        }
                exit(1);
        }
-       config = mmap(NULL, sizeof(struct configt), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
-       if (config == MAP_FAILED)
+       if (!(config = shared_malloc(sizeof(struct configt))))
        {
        {
-               log(0, 0, 0, 0, "Error doing mmap for configuration: %s\n", strerror(errno));
+               log(0, 0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno));
                exit(1);
        }
        memset(config, 0, sizeof(struct configt));
        time(&config->start_time);
                exit(1);
        }
        memset(config, 0, sizeof(struct configt));
        time(&config->start_time);
-       strncpy(config->config_file, CONFIGFILE, sizeof(config->config_file) - 1);
-       tunnel = mmap(NULL, sizeof(tunnelt) * MAXTUNNEL, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
-       if (tunnel == MAP_FAILED)
+       strncpy(config->config_file, optconfig, strlen(optconfig));
+       config->debug = optdebug;
+       config->num_tbfs = MAXTBFS;
+       config->rl_rate = 28; // 28kbps
+
+       if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
        {
        {
-               log(0, 0, 0, 0, "Error doing mmap for tunnels: %s\n", strerror(errno));
+               log(0, 0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
                exit(1);
        }
                exit(1);
        }
-       session = mmap(NULL, sizeof(sessiont) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
-       if (session == MAP_FAILED)
+       if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
        {
        {
-               log(0, 0, 0, 0, "Error doing mmap for sessions: %s\n", strerror(errno));
+               log(0, 0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
                exit(1);
        }
 
                exit(1);
        }
 
-       sess_count = mmap(NULL, sizeof(sessioncountt) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
-       if (sess_count == MAP_FAILED)
+       if (!(sess_count = shared_malloc(sizeof(sessioncountt) * MAXSESSION)))
        {
        {
-               log(0, 0, 0, 0, "Error doing mmap for sessions_count: %s\n", strerror(errno));
+               log(0, 0, 0, 0, "Error doing malloc for sessions_count: %s\n", strerror(errno));
                exit(1);
        }
 
                exit(1);
        }
 
-       radius = mmap(NULL, sizeof(radiust) * MAXRADIUS, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
-       if (radius == MAP_FAILED)
+       if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
        {
        {
-               log(0, 0, 0, 0, "Error doing mmap for radius: %s\n", strerror(errno));
+               log(0, 0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
                exit(1);
        }
                exit(1);
        }
-       ip_address_pool = mmap(NULL, sizeof(ippoolt) * MAXIPPOOL, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
-       if (ip_address_pool == MAP_FAILED)
+
+       if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
        {
        {
-               log(0, 0, 0, 0, "Error doing mmap for ip_address_pool: %s\n", strerror(errno));
+               log(0, 0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
                exit(1);
        }
                exit(1);
        }
+
 #ifdef RINGBUFFER
 #ifdef RINGBUFFER
-       ringbuffer = mmap(NULL, sizeof(struct Tringbuffer), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
-       if (ringbuffer == MAP_FAILED)
+       if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
        {
        {
-               log(0, 0, 0, 0, "Error doing mmap for ringbuffer: %s\n", strerror(errno));
+               log(0, 0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
                exit(1);
        }
        memset(ringbuffer, 0, sizeof(struct Tringbuffer));
 #endif
 
                exit(1);
        }
        memset(ringbuffer, 0, sizeof(struct Tringbuffer));
 #endif
 
-       cli_session_actions = mmap(NULL, sizeof(struct cli_session_actions) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
-       if (cli_session_actions == MAP_FAILED)
+       if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
        {
        {
-               log(0, 0, 0, 0, "Error doing mmap for cli session actions: %s\n", strerror(errno));
+               log(0, 0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
                exit(1);
        }
        memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
                exit(1);
        }
        memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
-       cli_tunnel_actions = mmap(NULL, sizeof(struct cli_tunnel_actions) * MAXSESSION, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
-       if (cli_tunnel_actions == MAP_FAILED)
+
+       if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
        {
        {
-               log(0, 0, 0, 0, "Error doing mmap for cli tunnel actions: %s\n", strerror(errno));
+               log(0, 0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
                exit(1);
        }
        memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
                exit(1);
        }
        memset(cli_tunnel_actions, 0, sizeof(struct cli_tunnel_actions) * MAXSESSION);
@@ -2471,7 +2541,8 @@ void initdata(void)
        memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
 
                // Put all the sessions on the free list marked as undefined.
        memset(ip_address_pool, 0, sizeof(ippoolt) * MAXIPPOOL);
 
                // Put all the sessions on the free list marked as undefined.
-       for (i = 1; i < MAXSESSION - 1; i++) {
+       for (i = 1; i < MAXSESSION - 1; i++)
+       {
                session[i].next = i + 1;
                session[i].tunnel = T_UNDEF;    // mark it as not filled in.
        }
                session[i].next = i + 1;
                session[i].tunnel = T_UNDEF;    // mark it as not filled in.
        }
@@ -2479,9 +2550,8 @@ void initdata(void)
        sessionfree = 1;
 
                // Mark all the tunnels as undefined (waiting to be filled in by a download).
        sessionfree = 1;
 
                // Mark all the tunnels as undefined (waiting to be filled in by a download).
-       for (i = 1; i < MAXTUNNEL- 1; i++) {
+       for (i = 1; i < MAXTUNNEL- 1; i++)
                tunnel[i].state = TUNNELUNDEF;  // mark it as not filled in.
                tunnel[i].state = TUNNELUNDEF;  // mark it as not filled in.
-       }
 
        if (!*hostname)
        {
 
        if (!*hostname)
        {
@@ -2490,13 +2560,13 @@ void initdata(void)
                gethostname(hostname, sizeof(hostname));
                if ((p = strchr(hostname, '.'))) *p = 0;
        }
                gethostname(hostname, sizeof(hostname));
                if ((p = strchr(hostname, '.'))) *p = 0;
        }
+
        _statistics->start_time = _statistics->last_reset = time(NULL);
 
 #ifdef BGP
        _statistics->start_time = _statistics->last_reset = time(NULL);
 
 #ifdef BGP
-       bgp_peers = mmap(NULL, sizeof(struct bgp_peer) * BGP_NUM_PEERS, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 0, 0);
-       if (bgp_peers == MAP_FAILED)
+       if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
        {
        {
-               log(0, 0, 0, 0, "Error doing mmap for bgp: %s\n", strerror(errno));
+               log(0, 0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
                exit(1);
        }
 #endif /* BGP */
                exit(1);
        }
 #endif /* BGP */
@@ -2603,7 +2673,8 @@ void rebuild_address_pool(void)
                //
                // Zero the IP pool allocation, and build
                // a map from IP address to pool index.
                //
                // Zero the IP pool allocation, and build
                // a map from IP address to pool index.
-       for (i = 1; i < MAXIPPOOL; ++i) {
+       for (i = 1; i < MAXIPPOOL; ++i)
+       {
                ip_address_pool[i].assigned = 0;
                ip_address_pool[i].session = 0;
                if (!ip_address_pool[i].address)
                ip_address_pool[i].assigned = 0;
                ip_address_pool[i].session = 0;
                if (!ip_address_pool[i].address)
@@ -2612,13 +2683,16 @@ void rebuild_address_pool(void)
                cache_ipmap(ip_address_pool[i].address, -i);    // Map pool IP to pool index.
        }
 
                cache_ipmap(ip_address_pool[i].address, -i);    // Map pool IP to pool index.
        }
 
-       for (i = 0; i < MAXSESSION; ++i) {
+       for (i = 0; i < MAXSESSION; ++i)
+       {
                int ipid;
                if (!session[i].ip || !session[i].tunnel)
                        continue;
                ipid = - lookup_ipmap(htonl(session[i].ip));
 
                int ipid;
                if (!session[i].ip || !session[i].tunnel)
                        continue;
                ipid = - lookup_ipmap(htonl(session[i].ip));
 
-               if (session[i].ip_pool_index < 0) {     // Not allocated out of the pool.
+               if (session[i].ip_pool_index < 0)
+               {
+                       // Not allocated out of the pool.
                        if (ipid < 1)                   // Not found in the pool either? good.
                                continue;
 
                        if (ipid < 1)                   // Not found in the pool either? good.
                                continue;
 
@@ -2629,7 +2703,8 @@ void rebuild_address_pool(void)
                }
 
 
                }
 
 
-               if (ipid > MAXIPPOOL || ipid < 0) {
+               if (ipid > MAXIPPOOL || ipid < 0)
+               {
                        log(0, 0, i, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i, ipid);
                        ipid = -1;
                        session[i].ip_pool_index = ipid;
                        log(0, 0, i, 0, "Session %d has a pool IP that's not found in the pool! (%d)\n", i, ipid);
                        ipid = -1;
                        session[i].ip_pool_index = ipid;
@@ -2785,54 +2860,55 @@ void snoop_send_packet(char *packet, u16 size, ipt destination, u16 port)
 
 void dump_acct_info()
 {
 
 void dump_acct_info()
 {
-    char filename[1024];
-    char timestr[64];
-    time_t t = time(NULL);
-    int i;
-    FILE *f = NULL;
+       char filename[1024];
+       char timestr[64];
+       time_t t = time(NULL);
+       int i;
+       FILE *f = NULL;
 
 
 
 
-    CSTAT(call_dump_acct_info);
+       CSTAT(call_dump_acct_info);
 
 
-    strftime(timestr, 64, "%Y%m%d%H%M%S", localtime(&t));
-    snprintf(filename, 1024, "%s/%s", config->accounting_dir, timestr);
+       strftime(timestr, 64, "%Y%m%d%H%M%S", localtime(&t));
+       snprintf(filename, 1024, "%s/%s", config->accounting_dir, timestr);
 
 
-    for (i = 0; i < MAXSESSION; i++)
-    {
-       if (!session[i].opened || !session[i].ip || !session[i].cin || !session[i].cout || !*session[i].user || session[i].walled_garden)
-               continue;
-       if (!f)
+       for (i = 0; i < MAXSESSION; i++)
        {
        {
-           time_t now = time(NULL);
-           if (!(f = fopen(filename, "w")))
-           {
-                   log(0, 0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
-                   return;
-           }
-           log(3, 0, 0, 0, "Dumping accounting information to %s\n", filename);
-           fprintf(f, "# dslwatch.pl dump file V1.01\n"
-               "# host: %s\n"
-               "# time: %ld\n"
-               "# uptime: %ld\n"
-               "# format: username ip qos uptxoctets downrxoctets\n",
-                   hostname,
-                   now,
-                   now - basetime);
-       }
-
-       log(4, 0, 0, 0, "Dumping accounting information for %s\n", session[i].user);
-       fprintf(f, "%s %s %d %u %u\n",
-           session[i].user,                            // username
-           inet_toa(htonl(session[i].ip)),             // ip
-           (session[i].throttle) ? 2 : 1,              // qos
-           (u32)session[i].cin,                // uptxoctets
-           (u32)session[i].cout);              // downrxoctets
-
-       session[i].pin = session[i].cin = 0;
-       session[i].pout = session[i].cout = 0;
-    }
-
-    if (f) fclose(f);
+               if (!session[i].opened || !session[i].ip || (!session[i].cin && !session[i].cout) || !*session[i].user || session[i].walled_garden)
+                       continue;
+               if (!f)
+               {
+                       time_t now = time(NULL);
+                       if (!(f = fopen(filename, "w")))
+                       {
+                               log(0, 0, 0, 0, "Can't write accounting info to %s: %s\n", filename, strerror(errno));
+                               return ;
+                       }
+                       log(3, 0, 0, 0, "Dumping accounting information to %s\n", filename);
+                       fprintf(f, "# dslwatch.pl dump file V1.01\n"
+                               "# host: %s\n"
+                               "# time: %ld\n"
+                               "# uptime: %ld\n"
+                               "# format: username ip qos uptxoctets downrxoctets\n",
+                               hostname,
+                               now,
+                               now - basetime);
+               }
+
+               log(4, 0, 0, 0, "Dumping accounting information for %s\n", session[i].user);
+               fprintf(f, "%s %s %d %u %u\n",
+                       session[i].user,                // username
+                       inet_toa(htonl(session[i].ip)), // ip
+                       (session[i].throttle) ? 2 : 1,  // qos
+                       (u32)session[i].cin,            // uptxoctets
+                       (u32)session[i].cout);          // downrxoctets
+
+               session[i].pin = session[i].cin = 0;
+               session[i].pout = session[i].cout = 0;
+       }
+
+       if (f)
+               fclose(f);
 }
 
 // Main program
 }
 
 // Main program
@@ -2840,13 +2916,14 @@ int main(int argc, char *argv[])
 {
        int o;
        int optdebug = 0;
 {
        int o;
        int optdebug = 0;
+       char *optconfig = CONFIGFILE;
 
        _program_name = strdup(argv[0]);
 
        time(&basetime);             // start clock
 
        // scan args
 
        _program_name = strdup(argv[0]);
 
        time(&basetime);             // start clock
 
        // scan args
-       while ((o = getopt(argc, argv, "vc:h:a:")) >= 0)
+       while ((o = getopt(argc, argv, "dvc:h:")) >= 0)
        {
                switch (o)
                {
        {
                switch (o)
                {
@@ -2858,10 +2935,12 @@ int main(int argc, char *argv[])
                        case 'v':
                                optdebug++;
                                break;
                        case 'v':
                                optdebug++;
                                break;
+                       case 'c':
+                               optconfig = optarg;
+                               break;
                        case 'h':
                                snprintf(hostname, sizeof(hostname), "%s", optarg);
                                break;
                        case 'h':
                                snprintf(hostname, sizeof(hostname), "%s", optarg);
                                break;
-                       case '?':
                        default:
                                printf("Args are:\n"
                                       "\t-d\tDetach from terminal\n"
                        default:
                                printf("Args are:\n"
                                       "\t-d\tDetach from terminal\n"
@@ -2883,13 +2962,11 @@ int main(int argc, char *argv[])
 
        initiptables();
        initplugins();
 
        initiptables();
        initplugins();
-       initdata();
-
-       config->debug = optdebug;
+       initdata(optdebug, optconfig);
 
 
-       init_tbf();
-       init_cli(hostname);
        read_config_file();
        read_config_file();
+       init_tbf(config->num_tbfs);
+       init_cli(hostname);
 
        log(0, 0, 0, 0, "L2TPNS version " VERSION "\n");
        log(0, 0, 0, 0, "Copyright (c) 2003, 2004 Optus Internet Engineering\n");
 
        log(0, 0, 0, 0, "L2TPNS version " VERSION "\n");
        log(0, 0, 0, 0, "Copyright (c) 2003, 2004 Optus Internet Engineering\n");
@@ -2938,11 +3015,11 @@ int main(int argc, char *argv[])
        signal(SIGPIPE, SIG_IGN);
        bgp_setup(config->as_number);
        bgp_add_route(config->bind_address, 0xffffffff);
        signal(SIGPIPE, SIG_IGN);
        bgp_setup(config->as_number);
        bgp_add_route(config->bind_address, 0xffffffff);
-        if (*config->bgp_peer[0])
+       if (*config->bgp_peer[0])
                bgp_start(&bgp_peers[0], config->bgp_peer[0],
                    config->bgp_peer_as[0], 0); /* 0 = routing disabled */
 
                bgp_start(&bgp_peers[0], config->bgp_peer[0],
                    config->bgp_peer_as[0], 0); /* 0 = routing disabled */
 
-        if (*config->bgp_peer[1])
+       if (*config->bgp_peer[1])
                bgp_start(&bgp_peers[1], config->bgp_peer[1],
                    config->bgp_peer_as[1], 0);
 #endif /* BGP */
                bgp_start(&bgp_peers[1], config->bgp_peer[1],
                    config->bgp_peer_as[1], 0);
 #endif /* BGP */
@@ -2993,6 +3070,10 @@ int main(int argc, char *argv[])
        /* remove plugins (so cleanup code gets run) */
        plugins_done();
 
        /* remove plugins (so cleanup code gets run) */
        plugins_done();
 
+       // Remove the PID file if we wrote it
+       if (config->wrote_pid && *config->pid_file == '/')
+               unlink(config->pid_file);
+
        /* kill CLI children */
        signal(SIGTERM, SIG_IGN);
        kill(0, SIGTERM);
        /* kill CLI children */
        signal(SIGTERM, SIG_IGN);
        kill(0, SIGTERM);
@@ -3079,168 +3160,178 @@ void sigchild_handler(int signal)
 
 void read_state()
 {
 
 void read_state()
 {
-    struct stat sb;
-    int i;
-    ippoolt itmp;
-    FILE *f;
-    char magic[sizeof(DUMP_MAGIC)-1];
-    u32 buf[2];
+       struct stat sb;
+       int i;
+       ippoolt itmp;
+       FILE *f;
+       char magic[sizeof(DUMP_MAGIC) - 1];
+       u32 buf[2];
 
 
-    if (!config->save_state)
-    {
-       unlink(STATEFILE);
-       return;
-    }
+       if (!config->save_state)
+       {
+               unlink(STATEFILE);
+               return ;
+       }
 
 
-    if (stat(STATEFILE, &sb) < 0)
-    {
-       unlink(STATEFILE);
-       return;
-    }
+       if (stat(STATEFILE, &sb) < 0)
+       {
+               unlink(STATEFILE);
+               return ;
+       }
 
 
-    if (sb.st_mtime < (time(NULL) - 60))
-    {
-       log(0, 0, 0, 0, "State file is too old to read, ignoring\n");
+       if (sb.st_mtime < (time(NULL) - 60))
+       {
+               log(0, 0, 0, 0, "State file is too old to read, ignoring\n");
+               unlink(STATEFILE);
+               return ;
+       }
+
+       f = fopen(STATEFILE, "r");
        unlink(STATEFILE);
        unlink(STATEFILE);
-       return;
-    }
-
-    f = fopen(STATEFILE, "r");
-    unlink(STATEFILE);
-
-    if (!f)
-    {
-       log(0, 0, 0, 0, "Can't read state file: %s\n", strerror(errno));
-       exit(1);
-    }
-
-    if (fread(magic, sizeof(magic), 1, f) != 1 || strncmp(magic, DUMP_MAGIC, sizeof(magic)))
-    {
-       log(0, 0, 0, 0, "Bad state file magic\n");
-       exit(1);
-    }
-
-    log(1, 0, 0, 0, "Reading state information\n");
-    if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] > MAXIPPOOL || buf[1] != sizeof(ippoolt))
-    {
-       log(0, 0, 0, 0, "Error/mismatch reading ip pool header from state file\n");
-       exit(1);
-    }
-
-    if (buf[0] > ip_pool_size)
-    {
-       log(0, 0, 0, 0, "ip pool has shrunk!  state = %d, current = %d\n", buf[0], ip_pool_size);
-       exit(1);
-    }
-
-    log(2, 0, 0, 0, "Loading %u ip addresses\n", buf[0]);
-    for (i = 0; i < buf[0]; i++)
-    {
-       if (fread(&itmp, sizeof(itmp), 1, f) != 1)
-       {
-           log(0, 0, 0, 0, "Error reading ip %d from state file: %s\n", i, strerror(errno));
-           exit(1);
-       }
-
-       if (itmp.address != ip_address_pool[i].address)
-       {
-           log(0, 0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i);
-           exit(1);
-       }
-
-       memcpy(&ip_address_pool[i], &itmp, sizeof(itmp));
-    }
-
-    if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXTUNNEL || buf[1] != sizeof(tunnelt))
-    {
-       log(0, 0, 0, 0, "Error/mismatch reading tunnel header from state file\n");
-       exit(1);
-    }
-
-    log(2, 0, 0, 0, "Loading %u tunnels\n", MAXTUNNEL);
-    if (fread(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL)
-    {
-       log(0, 0, 0, 0, "Error reading tunnel data from state file\n");
-       exit(1);
-    }
-
-    for (i = 0; i < MAXTUNNEL; i++)
-    {
-       tunnel[i].controlc = 0;
-       tunnel[i].controls = NULL;
-       tunnel[i].controle = NULL;
-       if (*tunnel[i].hostname)
-           log(3, 0, 0, 0, "Created tunnel for %s\n", tunnel[i].hostname);
-    }
-
-    if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXSESSION || buf[1] != sizeof(sessiont))
-    {
-       log(0, 0, 0, 0, "Error/mismatch reading session header from state file\n");
-       exit(1);
-    }
-
-    log(2, 0, 0, 0, "Loading %u sessions\n", MAXSESSION);
-    if (fread(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION)
-    {
-       log(0, 0, 0, 0, "Error reading session data from state file\n");
-       exit(1);
-    }
-
-    for (i = 0; i < MAXSESSION; i++)
-    {
-       session[i].tbf_in = 0;
-       session[i].tbf_out = 0;
-       if (session[i].opened)
-       {
-           log(2, 0, i, 0, "Loaded active session for user %s\n", session[i].user);
-           if (session[i].ip)
-               sessionsetup(session[i].tunnel, i);
-       }
-    }
-
-    fclose(f);
-    log(0, 0, 0, 0, "Loaded saved state information\n");
+
+       if (!f)
+       {
+               log(0, 0, 0, 0, "Can't read state file: %s\n", strerror(errno));
+               exit(1);
+       }
+
+       if (fread(magic, sizeof(magic), 1, f) != 1 || strncmp(magic, DUMP_MAGIC, sizeof(magic)))
+       {
+               log(0, 0, 0, 0, "Bad state file magic\n");
+               exit(1);
+       }
+
+       log(1, 0, 0, 0, "Reading state information\n");
+       if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] > MAXIPPOOL || buf[1] != sizeof(ippoolt))
+       {
+               log(0, 0, 0, 0, "Error/mismatch reading ip pool header from state file\n");
+               exit(1);
+       }
+
+       if (buf[0] > ip_pool_size)
+       {
+               log(0, 0, 0, 0, "ip pool has shrunk!  state = %d, current = %d\n", buf[0], ip_pool_size);
+               exit(1);
+       }
+
+       log(2, 0, 0, 0, "Loading %u ip addresses\n", buf[0]);
+       for (i = 0; i < buf[0]; i++)
+       {
+               if (fread(&itmp, sizeof(itmp), 1, f) != 1)
+               {
+                       log(0, 0, 0, 0, "Error reading ip %d from state file: %s\n", i, strerror(errno));
+                       exit(1);
+               }
+
+               if (itmp.address != ip_address_pool[i].address)
+               {
+                       log(0, 0, 0, 0, "Mismatched ip %d from state file: pool may only be extended\n", i);
+                       exit(1);
+               }
+
+               memcpy(&ip_address_pool[i], &itmp, sizeof(itmp));
+       }
+
+       if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXTUNNEL || buf[1] != sizeof(tunnelt))
+       {
+               log(0, 0, 0, 0, "Error/mismatch reading tunnel header from state file\n");
+               exit(1);
+       }
+
+       log(2, 0, 0, 0, "Loading %u tunnels\n", MAXTUNNEL);
+       if (fread(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL)
+       {
+               log(0, 0, 0, 0, "Error reading tunnel data from state file\n");
+               exit(1);
+       }
+
+       for (i = 0; i < MAXTUNNEL; i++)
+       {
+               tunnel[i].controlc = 0;
+               tunnel[i].controls = NULL;
+               tunnel[i].controle = NULL;
+               if (*tunnel[i].hostname)
+                       log(3, 0, 0, 0, "Created tunnel for %s\n", tunnel[i].hostname);
+       }
+
+       if (fread(buf, sizeof(buf), 1, f) != 1 || buf[0] != MAXSESSION || buf[1] != sizeof(sessiont))
+       {
+               log(0, 0, 0, 0, "Error/mismatch reading session header from state file\n");
+               exit(1);
+       }
+
+       log(2, 0, 0, 0, "Loading %u sessions\n", MAXSESSION);
+       if (fread(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION)
+       {
+               log(0, 0, 0, 0, "Error reading session data from state file\n");
+               exit(1);
+       }
+
+       for (i = 0; i < MAXSESSION; i++)
+       {
+               session[i].tbf_in = 0;
+               session[i].tbf_out = 0;
+               if (session[i].opened)
+               {
+                       log(2, 0, i, 0, "Loaded active session for user %s\n", session[i].user);
+                       if (session[i].ip)
+                               sessionsetup(session[i].tunnel, i);
+               }
+       }
+
+       fclose(f);
+       log(0, 0, 0, 0, "Loaded saved state information\n");
 }
 
 void dump_state()
 {
 }
 
 void dump_state()
 {
-    FILE *f;
-    u32 buf[2];
+       FILE *f;
+       u32 buf[2];
 
 
-    if (!config->save_state)
-       return;
+       if (!config->save_state)
+               return;
 
 
-    do {
-       if (!(f = fopen(STATEFILE, "w")))
-           break;
+       do
+       {
+               if (!(f = fopen(STATEFILE, "w")))
+                       break;
 
 
-       log(1, 0, 0, 0, "Dumping state information\n");
+               log(1, 0, 0, 0, "Dumping state information\n");
 
 
-       if (fwrite(DUMP_MAGIC, sizeof(DUMP_MAGIC)-1, 1, f) != 1) break;
+               if (fwrite(DUMP_MAGIC, sizeof(DUMP_MAGIC) - 1, 1, f) != 1)
+                       break;
 
 
-       log(2, 0, 0, 0, "Dumping %u ip addresses\n", ip_pool_size);
-       buf[0] = ip_pool_size;
-       buf[1] = sizeof(ippoolt);
-       if (fwrite(buf, sizeof(buf), 1, f) != 1) break;
-       if (fwrite(ip_address_pool, sizeof(ippoolt), ip_pool_size, f) != ip_pool_size) break;
+               log(2, 0, 0, 0, "Dumping %u ip addresses\n", ip_pool_size);
+               buf[0] = ip_pool_size;
+               buf[1] = sizeof(ippoolt);
+               if (fwrite(buf, sizeof(buf), 1, f) != 1)
+                       break;
+               if (fwrite(ip_address_pool, sizeof(ippoolt), ip_pool_size, f) != ip_pool_size)
+                       break;
 
 
-       log(2, 0, 0, 0, "Dumping %u tunnels\n", MAXTUNNEL);
-       buf[0] = MAXTUNNEL;
-       buf[1] = sizeof(tunnelt);
-       if (fwrite(buf, sizeof(buf), 1, f) != 1) break;
-       if (fwrite(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL) break;
+               log(2, 0, 0, 0, "Dumping %u tunnels\n", MAXTUNNEL);
+               buf[0] = MAXTUNNEL;
+               buf[1] = sizeof(tunnelt);
+               if (fwrite(buf, sizeof(buf), 1, f) != 1)
+                       break;
+               if (fwrite(tunnel, sizeof(tunnelt), MAXTUNNEL, f) != MAXTUNNEL)
+                       break;
 
 
-       log(2, 0, 0, 0, "Dumping %u sessions\n", MAXSESSION);
-       buf[0] = MAXSESSION;
-       buf[1] = sizeof(sessiont);
-       if (fwrite(buf, sizeof(buf), 1, f) != 1) break;
-       if (fwrite(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION) break;
+               log(2, 0, 0, 0, "Dumping %u sessions\n", MAXSESSION);
+               buf[0] = MAXSESSION;
+               buf[1] = sizeof(sessiont);
+               if (fwrite(buf, sizeof(buf), 1, f) != 1)
+                       break;
+               if (fwrite(session, sizeof(sessiont), MAXSESSION, f) != MAXSESSION)
+                       break;
 
 
-       if (fclose(f) == 0) return; // OK
-    } while (0);
+               if (fclose(f) == 0)
+                       return ; // OK
+       }
+       while (0);
 
 
-    log(0, 0, 0, 0, "Can't write state information: %s\n", strerror(errno));
-    unlink(STATEFILE);
+       log(0, 0, 0, 0, "Can't write state information: %s\n", strerror(errno));
+       unlink(STATEFILE);
 }
 
 void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response)
 }
 
 void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response)
@@ -3269,13 +3360,13 @@ void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **ch
 
 static int facility_value(char *name)
 {
 
 static int facility_value(char *name)
 {
-    int i;
-    for (i = 0; facilitynames[i].c_name; i++)
-    {
-       if (strcmp(facilitynames[i].c_name, name) == 0)
-           return facilitynames[i].c_val;
-    }
-    return 0;
+       int i;
+       for (i = 0; facilitynames[i].c_name; i++)
+       {
+               if (strcmp(facilitynames[i].c_name, name) == 0)
+                       return facilitynames[i].c_val;
+       }
+       return 0;
 }
 
 void update_config()
 }
 
 void update_config()
@@ -3399,6 +3490,22 @@ void update_config()
                timeout = config->cluster_hb_timeout;
        }
 
                timeout = config->cluster_hb_timeout;
        }
 
+       // Write PID file
+       if (*config->pid_file == '/' && !config->wrote_pid)
+       {
+               FILE *f;
+               if ((f = fopen(config->pid_file, "w")))
+               {
+                       fprintf(f, "%d\n", getpid());
+                       fclose(f);
+                       config->wrote_pid = 1;
+               }
+               else
+               {
+                       log(0, 0, 0, 0, "Can't write to PID file %s: %s\n", config->pid_file, strerror(errno));
+               }
+       }
+
        config->reload_config = 0;
 }
 
        config->reload_config = 0;
 }
 
@@ -3407,7 +3514,8 @@ void read_config_file()
        FILE *f;
 
        if (!config->config_file) return;
        FILE *f;
 
        if (!config->config_file) return;
-       if (!(f = fopen(config->config_file, "r"))) {
+       if (!(f = fopen(config->config_file, "r")))
+       {
                fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
                return;
        }
                fprintf(stderr, "Can't open config file %s: %s\n", config->config_file, strerror(errno));
                return;
        }
@@ -3429,7 +3537,6 @@ int sessionsetup(tunnelidt t, sessionidt s)
 
        CSTAT(call_sessionsetup);
 
 
        CSTAT(call_sessionsetup);
 
-
        log(3, session[s].ip, s, t, "Doing session setup for session\n");
 
        if (!session[s].ip || session[s].ip == 0xFFFFFFFE)
        log(3, session[s].ip, s, t, "Doing session setup for session\n");
 
        if (!session[s].ip || session[s].ip == 0xFFFFFFFE)
@@ -3439,7 +3546,11 @@ int sessionsetup(tunnelidt t, sessionidt s)
                        log(3, 0, s, t, "   No IP allocated. Assigned %s from pool\n",
                                        inet_toa(htonl(session[s].ip)));
                else
                        log(3, 0, s, t, "   No IP allocated. Assigned %s from pool\n",
                                        inet_toa(htonl(session[s].ip)));
                else
+               {
                        log(0, 0, s, t, "   No IP allocated. The IP address pool is FULL!\n");
                        log(0, 0, s, t, "   No IP allocated. The IP address pool is FULL!\n");
+                       sessionshutdown(s, "No IP addresses available");
+                       return 0;
+               }
        }
 
 
        }
 
 
@@ -3474,10 +3585,12 @@ int sessionsetup(tunnelidt t, sessionidt s)
        for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
                routeset(s, session[s].route[r].ip, session[s].route[r].mask, session[s].ip, 1);
 
        for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
                routeset(s, session[s].route[r].ip, session[s].route[r].mask, session[s].ip, 1);
 
-       if (!session[s].sid) {  // did this session just finish radius?
+       if (!session[s].unique_id)
+       {
+               // did this session just finish radius?
                log(3, session[s].ip, s, t, "Sending initial IPCP to client\n");
                sendipcp(t, s);
                log(3, session[s].ip, s, t, "Sending initial IPCP to client\n");
                sendipcp(t, s);
-               session[s].sid = ++last_sid;
+               session[s].unique_id = ++last_id;
        }
 
        // Run the plugin's against this new session.
        }
 
        // Run the plugin's against this new session.
@@ -3518,7 +3631,8 @@ int load_session(sessionidt s, sessiont *new)
 
                // Sanity checks.
        if (new->ip_pool_index >= MAXIPPOOL ||
 
                // Sanity checks.
        if (new->ip_pool_index >= MAXIPPOOL ||
-               new->tunnel >= MAXTUNNEL) {
+               new->tunnel >= MAXTUNNEL)
+       {
                log(0,0,s,0, "Strange session update received!\n");
                        // FIXME! What to do here?
                return 0;
                log(0,0,s,0, "Strange session update received!\n");
                        // FIXME! What to do here?
                return 0;
@@ -3549,7 +3663,9 @@ int load_session(sessionidt s, sessiont *new)
                                uncache_ipmap(session[s].ip);
                }
 
                                uncache_ipmap(session[s].ip);
                }
 
-               if (new->ip) {          // If there's a new one, add it.
+               if (new->ip)
+               {
+                       // If there's a new one, add it.
                        if (new->ip_pool_index == -1)
                                routeset(s, new->ip, 0, 0, 1);
                        else
                        if (new->ip_pool_index == -1)
                                routeset(s, new->ip, 0, 0, 1);
                        else
@@ -3833,7 +3949,8 @@ void become_master(void)
        int s;
        run_plugins(PLUGIN_BECOME_MASTER, NULL);
 
        int s;
        run_plugins(PLUGIN_BECOME_MASTER, NULL);
 
-       for (s = 1; s <= config->cluster_highest_sessionid ; ++s) {
+       for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
+       {
                if (!session[s].tunnel) // Not an in-use session.
                        continue;
 
                if (!session[s].tunnel) // Not an in-use session.
                        continue;
 
@@ -3855,7 +3972,8 @@ int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc
        time(&time_now);
        for (i = 0; i < 64;++i) buckets[i] = 0;
 
        time(&time_now);
        for (i = 0; i < 64;++i) buckets[i] = 0;
 
-       for (s = 1; s <= config->cluster_highest_sessionid ; ++s) {
+       for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
+       {
                int idle;
                if (!session[s].tunnel)
                        continue;
                int idle;
                if (!session[s].tunnel)
                        continue;
@@ -3871,7 +3989,8 @@ int cmd_show_hist_idle(struct cli_def *cli, char *command, char **argv, int argc
                ++buckets[idle];
        }
 
                ++buckets[idle];
        }
 
-       for (i = 0; i < 63; ++i) {
+       for (i = 0; i < 63; ++i)
+       {
                cli_print(cli, "%3d seconds  : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
        }
        cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
                cli_print(cli, "%3d seconds  : %7.2f%% (%6d)", i * 5, (double) buckets[i] * 100.0 / count , buckets[i]);
        }
        cli_print(cli, "lots of secs : %7.2f%% (%6d)", (double) buckets[63] * 100.0 / count , buckets[i]);
@@ -3891,7 +4010,8 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc
        time(&time_now);
        for (i = 0; i < 64;++i) buckets[i] = 0;
 
        time(&time_now);
        for (i = 0; i < 64;++i) buckets[i] = 0;
 
-       for (s = 1; s <= config->cluster_highest_sessionid ; ++s) {
+       for (s = 1; s <= config->cluster_highest_sessionid ; ++s)
+       {
                int open = 0, d;
                if (!session[s].tunnel)
                        continue;
                int open = 0, d;
                if (!session[s].tunnel)
                        continue;
@@ -3899,7 +4019,8 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc
                d = time_now - session[s].opened;
                if (d < 0)
                        d = 0;
                d = time_now - session[s].opened;
                if (d < 0)
                        d = 0;
-               while (d > 1 && open < 32) {
+               while (d > 1 && open < 32)
+               {
                        ++open;
                        d >>= 1; // half.
                }
                        ++open;
                        d >>= 1; // half.
                }
@@ -3908,10 +4029,85 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc
        }
 
        s = 1;
        }
 
        s = 1;
-       for (i = 0; i  < 30; ++i) {
+       for (i = 0; i  < 30; ++i)
+       {
                cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
                s <<= 1;
        }
        cli_print(cli, "%d total sessions open.", count);
        return CLI_OK;
 }
                cli_print(cli, " < %8d seconds : %7.2f%% (%6d)", s, (double) buckets[i] * 100.0 / count , buckets[i]);
                s <<= 1;
        }
        cli_print(cli, "%d total sessions open.", count);
        return CLI_OK;
 }
+
+/* Unhide an avp.
+ *
+ * This unencodes the AVP using the L2TP CHAP secret and the
+ * previously stored random vector. It replaces the hidden data with
+ * the cleartext data and returns the length of the cleartext data
+ * (including the AVP "header" of 6 bytes).
+ *
+ * Based on code from rp-l2tpd by Roaring Penguin Software Inc.
+ */
+int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length)
+{
+       MD5_CTX ctx;
+       u8 *cursor;
+       u8 digest[16];
+       u8 working_vector[16];
+       uint16_t hidden_length;
+       u8 type[2];
+       size_t done, todo;
+       u8 *output;
+
+       // Find the AVP type.
+       type[0] = *(avp + 4);
+       type[1] = *(avp + 5);
+
+       // Line up with the hidden data
+       cursor = output = avp + 6;
+
+       // Compute initial pad
+       MD5Init(&ctx);
+       MD5Update(&ctx, type, 2);
+       MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
+       MD5Update(&ctx, session[s].random_vector, session[s].random_vector_length);
+       MD5Final(digest, &ctx);
+
+       // Get hidden length
+       hidden_length = ((uint16_t) (digest[0] ^ cursor[0])) * 256 + (uint16_t) (digest[1] ^ cursor[1]);
+
+       // Keep these for later use
+       working_vector[0] = *cursor;
+       working_vector[1] = *(cursor + 1);
+       cursor += 2;
+
+       if (hidden_length > length - 8)
+       {
+               log(1, 0, s, t, "Hidden length %d too long in AVP of length %d\n", (int) hidden_length, (int) length);
+               return 0;
+       }
+
+       /* Decrypt remainder */
+       done = 2;
+       todo = hidden_length;
+       while (todo)
+       {
+               working_vector[done] = *cursor;
+               *output = digest[done] ^ *cursor;
+               ++output;
+               ++cursor;
+               --todo;
+               ++done;
+               if (done == 16 && todo)
+               {
+                       // Compute new digest
+                       done = 0;
+                       MD5Init(&ctx);
+                       MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
+                       MD5Update(&ctx, &working_vector, 16);
+                       MD5Final(digest, &ctx);
+               }
+       }
+
+       return hidden_length + 6;
+}
+
for cloning use: "git clone git://git.sameswireless.fr/l2tpns.git" ; For add to your sources.list: "deb http://package.sameswifi.fr/ jessie main"