// 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 1.12 2004/07/08 16:54:35 bodea Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.29 2004/09/23 03:59:09 fred_nerk Exp $";
#include <arpa/inet.h>
#include <assert.h>
int *radfds = NULL; // RADIUS requests file handles
int ifrfd = -1; // File descriptor for routing, etc
time_t basetime = 0; // base clock
-char hostname[1000] = ""; // us.
+char *hostname = NULL; // us.
int tunidx; // ifr_ifindex of tun device
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.
-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
struct config_descriptt config_values[] = {
CONFIG("debug", debug, INT),
CONFIG("log_file", log_filename, STRING),
+ CONFIG("pid_file", pid_file, STRING),
+ CONFIG("hostname", hostname, 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("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("cleanup_interval", cleanup_interval, INT),
CONFIG("multi_read_count", multi_read_count, INT),
CONFIG("scheduler_fifo", scheduler_fifo, BOOL),
+ CONFIG("lock_pages", lock_pages, BOOL),
CONFIG("icmp_rate", icmp_rate, INT),
CONFIG("cluster_address", cluster_address, IP),
CONFIG("cluster_interface", cluster_interface, STRING),
#define max_plugin_functions (sizeof(plugin_functions) / sizeof(char *))
-tunnelt *tunnel = NULL; // Array of tunnel structures.
-sessiont *session = NULL; // Array of session structures.
+tunnelt *tunnel = NULL; // Array of tunnel structures.
+sessiont *session = NULL; // Array of session structures.
sessioncountt *sess_count = NULL; // Array of partial per-session traffic counters.
-radiust *radius = NULL; // Array of radius structures.
+radiust *radius = NULL; // Array of radius structures.
ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
controlt *controlfree = 0;
struct Tstats *_statistics = NULL;
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);
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];
- for (j = 0; j < 256; ++j) {
- if (!e[j]) continue;
+ for (j = 0; j < 256; ++j)
+ {
+ if (!e[j])
+ continue;
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];
- 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;
}
}
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.
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;
}
// 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;
}
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;
}
// 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;
}
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;
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);
}
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);
}
return; // not a live session
}
- if (!session[s].die)
+ if (!dead)
log(2, 0, s, session[s].tunnel, "Shutting down session %d: %s\n", s, reason);
session[s].die = now() + 150; // Clean up in 15 seconds
}
// RADIUS Stop message
- if (session[s].opened && !walled_garden && !dead) {
+ if (session[s].opened && !walled_garden && !dead)
+ {
u16 r = session[s].radius;
if (!r)
{
}
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;
}
*(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.
}
CSTAT(call_sessionkill);
+ session[s].die = now();
sessionshutdown(s, reason); // close radius/routes, etc.
if (session[s].radius)
- radiusclear(session[s].radius, 0); // cant send clean accounting data, session is killed
+ radiusclear(session[s].radius, s); // cant send clean accounting data, session is killed
log(2, 0, s, session[s].tunnel, "Kill session %d (%s): %s\n", s, session[s].user, reason);
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;
}
//
// Is this a duplicate of the first packet? (SCCRQ)
//
- for ( i = 1; i <= config->cluster_highest_tunnelid ; ++i) {
- if (tunnel[t].state != TUNNELOPENING ||
- tunnel[t].ip != ntohl(*(ipt *) & addr->sin_addr) ||
- tunnel[t].port != ntohs(addr->sin_port) )
+ 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) )
continue;
t = i;
break;
}
}
- if (!t) {
+ if (!t)
+ {
if (!(t = new_tunnel()))
{
log(1, ntohl(addr->sin_addr.s_addr), 0, 0, "No more tunnels\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)
{
{
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];
- } 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 (n >= 4) {
+ if (n >= 4)
+ {
u16 errcode = ntohs(*(u16 *)(b + 2));
const char* errdesc = "(unknown)";
if (errcode <= MAX_ERROR_CODE)
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);
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)
{
// 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);
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");
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;
}
(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
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);
}
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;
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 (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;
}
+ // 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)
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;
}
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);
// 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();
}
* 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.
- } else {
+ }
+ else
+ {
next_clean = time_now + config->cleanup_interval; // Did. Move to next interval.
}
}
void initdata(void)
{
int i;
+ char *p;
- _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);
}
- 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);
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)
+ 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);
}
- 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);
}
- 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);
}
- 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);
}
- 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);
}
+
#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
- 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);
- 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);
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.
}
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.
- }
- if (!*hostname)
- {
- char *p;
- // Grab my hostname unless it's been specified
- gethostname(hostname, sizeof(hostname));
- if ((p = strchr(hostname, '.'))) *p = 0;
- }
+ // Grab my hostname unless it's been specified
+ gethostname(config->hostname, sizeof(config->hostname));
+ if ((p = strchr(config->hostname, '.'))) *p = 0;
+ hostname = config->hostname;
+
_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 */
//
// 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)
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));
- 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 > 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;
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
int main(int argc, char *argv[])
{
int o;
+ int optdebug = 0;
_program_name = strdup(argv[0]);
if (fork()) exit(0);
break;
case 'v':
- config->debug++;
+ optdebug++;
break;
case 'h':
snprintf(hostname, sizeof(hostname), "%s", optarg);
initiptables();
initplugins();
initdata();
+
+ config->debug = optdebug;
+
init_tbf();
- init_cli(hostname);
+ init_cli();
read_config_file();
log(0, 0, 0, 0, "L2TPNS version " VERSION "\n");
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 */
- 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 */
signal(SIGQUIT, sigquit_handler);
signal(SIGCHLD, sigchild_handler);
+ // Prevent us from getting paged out
+ if (config->lock_pages)
+ {
+ if (!mlockall(MCL_CURRENT))
+ log(1, 0, 0, 0, "Locking pages into memory\n");
+ else
+ log(0, 0, 0, 0, "Can't lock pages: %s\n", strerror(errno));
+ }
+
alarm(1);
// Drop privileges here
/* 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);
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);
- 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()
{
- 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)
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()
// Update radius
config->numradiusservers = 0;
for (i = 0; i < MAXRADSERVER; i++)
- if (config->radiusserver[i]) config->numradiusservers++;
+ if (config->radiusserver[i])
+ {
+ config->numradiusservers++;
+ // Set radius port: if not set, take the port from the
+ // first radius server. For the first radius server,
+ // take the #defined default value from l2tpns.h
+
+ // test twice, In case someone works with
+ // a secondary radius server without defining
+ // a primary one, this will work even then.
+ if (i>0 && !config->radiusport[i])
+ config->radiusport[i] = config->radiusport[i-1];
+ if (!config->radiusport[i])
+ config->radiusport[i] = RADPORT;
+ }
if (!config->numradiusservers)
{
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;
}
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;
}
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);
- session[s].sid = ++last_sid;
+ session[s].unique_id = ++last_id;
}
// Run the plugin's against this new session.
// 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;
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
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;
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;
++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]);
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;
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.
}
}
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;
}
+
+/* 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;
+}
+
projects / l2tpns.git / blobdiff