// 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 1.45 2004-11-05 07:50:05 bodea Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.57 2004-11-27 05:19:53 bodea Exp $";
#include <arpa/inet.h>
#include <assert.h>
#include "util.h"
#include "tbf.h"
+#ifdef BGP
+#include "bgp.h"
+#endif /* BGP */
+
// Globals
-struct configt *config = NULL; // all configuration
+configt *config = NULL; // all configuration
int tunfd = -1; // tun interface file handle. (network device)
int udpfd = -1; // UDP file handle
int controlfd = -1; // Control signal handle
+int clifd = -1; // Socket listening for CLI connections.
int snoopfd = -1; // UDP file handle for sending out intercept data
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.
-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).
+static u32 sessionid = 0; // session id for radius accounting
+static int syslog_log = 0; // are we logging to syslog
+static 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_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 cli_tunnel_actions *cli_tunnel_actions = NULL; // Pending tunnel changes required by CLI
static void *ip_hash[256]; // Mapping from IP address to session structures.
-u32 udp_tx = 0, udp_rx = 0, udp_rx_pkt = 0; // Global traffic counters.
-u32 eth_tx = 0, eth_rx = 0, eth_rx_pkt = 0;
-u32 ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
-time_t time_now = 0; // Current time in seconds since epoch.
-char time_now_string[64] = {0}; // Current time as a string.
-char main_quit = 0; // True if we're in the process of exiting.
-char *_program_name = NULL;
+// Traffic counters.
+static u32 udp_rx = 0, udp_rx_pkt = 0, udp_tx = 0;
+static u32 eth_rx = 0, eth_rx_pkt = 0;
+u32 eth_tx = 0;
+
+static u32 ip_pool_size = 1; // Size of the pool of addresses used for dynamic address allocation.
+time_t time_now = 0; // Current time in seconds since epoch.
+static char time_now_string[64] = {0}; // Current time as a string.
+static char main_quit = 0; // True if we're in the process of exiting.
linked_list *loaded_plugins;
linked_list *plugins[MAX_PLUGIN_TYPES];
-#ifdef BGP
-#include "bgp.h"
-struct bgp_peer *bgp_peers = 0;
-struct bgp_route_list *bgp_routes = 0;
-int bgp_configured = 0;
-#endif /* BGP */
-
#define membersize(STRUCT, MEMBER) sizeof(((STRUCT *)0)->MEMBER)
-#define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(struct configt, MEMBER), membersize(struct configt, MEMBER), TYPE }
+#define CONFIG(NAME, MEMBER, TYPE) { NAME, offsetof(configt, MEMBER), membersize(configt, MEMBER), TYPE }
-struct config_descriptt config_values[] = {
+config_descriptt config_values[] = {
CONFIG("debug", debug, INT),
CONFIG("log_file", log_filename, STRING),
CONFIG("pid_file", pid_file, STRING),
CONFIG("cluster_interface", cluster_interface, STRING),
CONFIG("cluster_hb_interval", cluster_hb_interval, INT),
CONFIG("cluster_hb_timeout", cluster_hb_timeout, INT),
-#ifdef BGP
- CONFIG("as_number", as_number, SHORT),
- CONFIG("bgp_peer1", bgp_peer[0], STRING),
- CONFIG("bgp_peer1_as", bgp_peer_as[0], SHORT),
- CONFIG("bgp_peer2", bgp_peer[1], STRING),
- CONFIG("bgp_peer2_as", bgp_peer_as[1], SHORT),
-#endif /* BGP */
{ NULL, 0, 0, 0 },
};
-char *plugin_functions[] = {
+static char *plugin_functions[] = {
NULL,
"plugin_pre_auth",
"plugin_post_auth",
sessioncountt *sess_count = NULL; // Array of partial per-session traffic counters.
radiust *radius = NULL; // Array of radius structures.
ippoolt *ip_address_pool = NULL; // Array of dynamic IP addresses.
-controlt *controlfree = 0;
+ip_filtert *ip_filters = NULL; // Array of named filters.
+static controlt *controlfree = 0;
struct Tstats *_statistics = NULL;
#ifdef RINGBUFFER
struct Tringbuffer *ringbuffer = NULL;
#endif
-void sigalrm_handler(int);
-void sighup_handler(int);
-void sigterm_handler(int);
-void sigquit_handler(int);
-void sigchild_handler(int);
-void read_config_file();
-void read_state();
-void dump_state();
-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 free_ip_address(sessionidt s);
+static void dump_acct_info(void);
+static void sighup_handler(int sig);
+static void sigalrm_handler(int sig);
+static void sigterm_handler(int sig);
+static void sigquit_handler(int sig);
+static void sigchild_handler(int sig);
+static void read_state(void);
+static void dump_state(void);
+static void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response);
+static void update_config(void);
+static void read_config_file(void);
+static void initplugins(void);
+static int add_plugin(char *plugin_name);
+static int remove_plugin(char *plugin_name);
+static void plugins_done(void);
+static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr, int alen);
+static tunnelidt new_tunnel(void);
+static int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length);
// return internal time (10ths since process startup)
-clockt now(void)
+static clockt now(void)
{
struct timeval t;
gettimeofday(&t, 0);
// Add a route
//
// This adds it to the routing table, advertises it
-// via iBGP if enabled, and stuffs it into the
+// via BGP if enabled, and stuffs it into the
// 'sessionbyip' cache.
//
// 'ip' and 'mask' must be in _host_ order.
//
-void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add)
+static void routeset(sessionidt s, ipt ip, ipt mask, ipt gw, u8 add)
{
struct rtentry r;
int i;
#endif /* BGP */
// Add/Remove the IPs to the 'sessionbyip' cache.
- // Note that we add the zero address in the case of
+ // Note that we add the zero address in the case of
// a network route. Roll on CIDR.
// Note that 's == 0' implies this is the address pool.
//
// Set up TUN interface
-void inittun(void)
+static void inittun(void)
{
struct ifreq ifr;
struct sockaddr_in sin = {0};
LOG(0, 0, 0, 0, "Error setting tun flags: %s\n", strerror(errno));
exit(1);
}
- if (ioctl(ifrfd, SIOCGIFINDEX, (void *) &ifr) < 0)
- {
- LOG(0, 0, 0, 0, "Error setting tun ifindex: %s\n", strerror(errno));
- exit(1);
- }
- tunidx = ifr.ifr_ifindex;
}
// set up UDP port
-void initudp(void)
+static void initudp(void)
{
int on = 1;
struct sockaddr_in addr;
// Control
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
- addr.sin_port = htons(1702);
- controlfd = socket(AF_INET, SOCK_DGRAM, 17);
+ addr.sin_port = htons(NSCTL_PORT);
+ controlfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
setsockopt(controlfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
if (bind(controlfd, (void *) &addr, sizeof(addr)) < 0)
{
// IP address.
//
-int lookup_ipmap(ipt ip)
+static int lookup_ipmap(ipt ip)
{
u8 *a = (u8 *)&ip;
char **d = (char **) ip_hash;
}
// Find session by username, 0 for not found
-sessiont *sessiontbysessionidt(sessionidt s)
+static sessiont *sessiontbysessionidt(sessionidt s)
{
if (!s || s > MAXSESSION) return NULL;
return &session[s];
}
-sessionidt sessionidtbysessiont(sessiont *s)
+static sessionidt sessionidtbysessiont(sessiont *s)
{
sessionidt val = s-session;
if (s < session || val > MAXSESSION) return 0;
STAT(tunnel_tx_errors);
return;
}
+
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
*(u32 *) & addr.sin_addr = htonl(tunnel[t].ip);
// process outgoing (to tunnel) IP
//
-void processipout(u8 * buf, int len)
+static void processipout(u8 * buf, int len)
{
sessionidt s;
sessiont *sp;
return;
}
- // Snooping this session, send it to intercept box
- if (sp->snoop_ip && sp->snoop_port)
- snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
-
LOG(5, session[s].ip, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
// Add on L2TP header
{
u8 *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
- if (!p)
- {
- LOG(3, session[s].ip, s, t, "failed to send packet in processipout.\n");
- return;
- }
+ if (!p) return;
tunnelsend(b, len + (p-b), t); // send it...
}
+ // Snooping this session, send it to intercept box
+ if (sp->snoop_ip && sp->snoop_port)
+ snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
+
sp->cout += len; // byte count
sp->total_cout += len; // byte count
sp->pout++;
// Helper routine for the TBF filters.
// Used to send queued data in to the user!
//
-void send_ipout(sessionidt s, u8 *buf, int len)
+static void send_ipout(sessionidt s, u8 *buf, int len)
{
sessiont *sp;
tunnelidt t;
if (!session[s].ip)
return;
+
t = session[s].tunnel;
sp = &session[s];
LOG(5, session[s].ip, s, t, "Ethernet -> Tunnel (%d bytes)\n", len);
- // Snooping this session.
- if (sp->snoop_ip && sp->snoop_port)
- snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
-
// Add on L2TP header
{
u8 *p = makeppp(b, sizeof(b), buf, len, t, s, PPPIP);
- if (!p)
- {
- LOG(3, session[s].ip, s, t, "failed to send packet in send_ipout.\n");
- return;
- }
+ if (!p) return;
tunnelsend(b, len + (p-b), t); // send it...
}
+
+ // Snooping this session.
+ if (sp->snoop_ip && sp->snoop_port)
+ snoop_send_packet(buf, len, sp->snoop_ip, sp->snoop_port);
+
sp->cout += len; // byte count
sp->total_cout += len; // byte count
sp->pout++;
}
// add an AVP (16 bit)
-void control16(controlt * c, u16 avp, u16 val, u8 m)
+static void control16(controlt * c, u16 avp, u16 val, u8 m)
{
u16 l = (m ? 0x8008 : 0x0008);
*(u16 *) (c->buf + c->length + 0) = htons(l);
}
// add an AVP (32 bit)
-void control32(controlt * c, u16 avp, u32 val, u8 m)
+static void control32(controlt * c, u16 avp, u32 val, u8 m)
{
u16 l = (m ? 0x800A : 0x000A);
*(u16 *) (c->buf + c->length + 0) = htons(l);
}
// add an AVP (32 bit)
-void controls(controlt * c, u16 avp, char *val, u8 m)
+static void controls(controlt * c, u16 avp, char *val, u8 m)
{
u16 l = ((m ? 0x8000 : 0) + strlen(val) + 6);
*(u16 *) (c->buf + c->length + 0) = htons(l);
}
// add a binary AVP
-void controlb(controlt * c, u16 avp, char *val, unsigned int len, u8 m)
+static void controlb(controlt * c, u16 avp, char *val, unsigned int len, u8 m)
{
u16 l = ((m ? 0x8000 : 0) + len + 6);
*(u16 *) (c->buf + c->length + 0) = htons(l);
}
// new control connection
-controlt *controlnew(u16 mtype)
+static controlt *controlnew(u16 mtype)
{
controlt *c;
if (!controlfree)
// send zero block if nothing is waiting
// (ZLB send).
-void controlnull(tunnelidt t)
+static void controlnull(tunnelidt t)
{
u8 buf[12];
if (tunnel[t].controlc) // Messages queued; They will carry the ack.
}
// add a control message to a tunnel, and send if within window
-void controladd(controlt * c, tunnelidt t, sessionidt s)
+static void controladd(controlt * c, tunnelidt t, sessionidt s)
{
*(u16 *) (c->buf + 2) = htons(c->length); // length
*(u16 *) (c->buf + 4) = htons(tunnel[t].far); // tunnel
tunnel[t].controle->next = c;
else
tunnel[t].controls = c;
+
tunnel[t].controle = c;
tunnel[t].controlc++;
+
// send now if space in window
if (tunnel[t].controlc <= tunnel[t].window)
{
// start tidy shutdown of session
void sessionshutdown(sessionidt s, char *reason)
{
- int dead = session[s].die;
int walled_garden = session[s].walled_garden;
return; // not a live session
}
- 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
-
+ if (!session[s].die)
{
struct param_kill_session data = { &tunnel[session[s].tunnel], &session[s] };
+ LOG(2, 0, s, session[s].tunnel, "Shutting down session %d: %s\n", s, reason);
run_plugins(PLUGIN_KILL_SESSION, &data);
}
// RADIUS Stop message
- if (session[s].opened && !walled_garden && !dead)
+ if (session[s].opened && !walled_garden && !session[s].die)
{
u16 r = session[s].radius;
if (!r)
if (session[s].ip)
{ // IP allocated, clear and unroute
int r;
+ int routed = 0;
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, 0);
+ if ((session[s].ip & session[s].route[r].mask) ==
+ (session[s].route[r].ip & session[s].route[r].mask))
+ routed++;
+
+ routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 0);
session[s].route[r].ip = 0;
}
if (session[s].ip_pool_index == -1) // static ip
{
- routeset(s, session[s].ip, 0, 0, 0); // Delete route.
+ if (!routed) routeset(s, session[s].ip, 0, 0, 0);
session[s].ip = 0;
}
else
controladd(c, session[s].tunnel, s); // send the message
}
+ if (!session[s].die)
+ session[s].die = now() + 150; // Clean up in 15 seconds
+
cluster_send_session(s);
}
}
q = makeppp(buf,sizeof(buf), 0, 0, t, s, PPPIPCP);
- if (!q)
- {
- LOG(3, session[s].ip, s, t, "failed to send packet in sendipcp.\n");
- return;
- }
+ if (!q) return;
*q = ConfigReq;
q[1] = r << RADIUS_SHIFT; // ID, dont care, we only send one type of request
}
// kill a session now
-void sessionkill(sessionidt s, char *reason)
+static void sessionkill(sessionidt s, char *reason)
{
CSTAT(call_sessionkill);
cluster_send_session(s);
}
+static void tunnelclear(tunnelidt t)
+{
+ if (!t) return;
+ memset(&tunnel[t], 0, sizeof(tunnel[t]));
+ tunnel[t].state = TUNNELFREE;
+}
+
// kill a tunnel now
-void tunnelkill(tunnelidt t, char *reason)
+static void tunnelkill(tunnelidt t, char *reason)
{
sessionidt s;
controlt *c;
}
// shut down a tunnel cleanly
-void tunnelshutdown(tunnelidt t, char *reason)
+static void tunnelshutdown(tunnelidt t, char *reason)
{
sessionidt s;
// close session
for (s = 1; s < MAXSESSION; s++)
if (session[s].tunnel == t)
- sessionkill(s, reason);
+ sessionshutdown(s, reason);
tunnel[t].state = TUNNELDIE;
tunnel[t].die = now() + 700; // Clean up in 70 seconds
STAT(tunnel_rx_errors);
return;
}
- LOG(3, ntohl(addr->sin_addr.s_addr), s, t, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
- l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
- // if no tunnel specified, assign one
- if (!t)
+
+ // check for duplicate tunnel open message
+ if (!t && ns == 0)
{
int i;
tunnel[i].port != ntohs(addr->sin_port) )
continue;
t = i;
+ LOG(3, ntohl(addr->sin_addr.s_addr), s, t, "Duplicate SCCRQ?\n");
break;
}
}
+ LOG(3, ntohl(addr->sin_addr.s_addr), s, t, "Control message (%d bytes): (unacked %d) l-ns %d l-nr %d r-ns %d r-nr %d\n",
+ l, tunnel[t].controlc, tunnel[t].ns, tunnel[t].nr, ns, nr);
+
+ // if no tunnel specified, assign one
if (!t)
{
if (!(t = new_tunnel()))
tunnel[t].ip = ntohl(*(ipt *) & addr->sin_addr);
tunnel[t].port = ntohs(addr->sin_port);
tunnel[t].window = 4; // default window
- LOG(1, ntohl(addr->sin_addr.s_addr), 0, t, " New tunnel from %u.%u.%u.%u/%u ID %d\n", tunnel[t].ip >> 24, tunnel[t].ip >> 16 & 255, tunnel[t].ip >> 8 & 255, tunnel[t].ip & 255, tunnel[t].port, t);
STAT(tunnel_created);
+ LOG(1, ntohl(addr->sin_addr.s_addr), 0, t, " New tunnel from %u.%u.%u.%u/%u ID %d\n",
+ tunnel[t].ip >> 24, tunnel[t].ip >> 16 & 255,
+ tunnel[t].ip >> 8 & 255, tunnel[t].ip & 255, tunnel[t].port, t);
+ }
+
+ // If the 'ns' just received is not the 'nr' we're
+ // expecting, just send an ack and drop it.
+ //
+ // if 'ns' is less, then we got a retransmitted packet.
+ // if 'ns' is greater than missed a packet. Either way
+ // we should ignore it.
+ if (ns != tunnel[t].nr)
+ {
+ // is this the sequence we were expecting?
+ STAT(tunnel_rx_errors);
+ LOG(1, ntohl(addr->sin_addr.s_addr), 0, t, " Out of sequence tunnel %d, (%d is not the expected %d)\n",
+ t, ns, tunnel[t].nr);
+
+ if (l) // Is this not a ZLB?
+ controlnull(t);
+ return;
}
// This is used to time out old tunnels
{
int skip = tunnel[t].window; // track how many in-window packets are still in queue
// some to clear maybe?
- while (tunnel[t].controlc && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
+ while (tunnel[t].controlc > 0 && (((tunnel[t].ns - tunnel[t].controlc) - nr) & 0x8000))
{
controlt *c = tunnel[t].controls;
tunnel[t].controls = c->next;
tunnel[t].try = 0; // we have progress
}
- // If the 'ns' just received is not the 'nr' we're
- // expecting, just send an ack and drop it.
- //
- // if 'ns' is less, then we got a retransmitted packet.
- // if 'ns' is greater than missed a packet. Either way
- // we should ignore it.
- if (ns != tunnel[t].nr)
- {
- // is this the sequence we were expecting?
- LOG(1, ntohl(addr->sin_addr.s_addr), 0, t, " Out of sequence tunnel %d, (%d is not the expected %d)\n", t, ns, tunnel[t].nr);
- STAT(tunnel_rx_errors);
-
- if (l) // Is this not a ZLB?
- controlnull(t);
- return;
- }
// receiver advance (do here so quoted correctly in any sends below)
if (l) tunnel[t].nr = (ns + 1);
if (skip < 0) skip = 0;
}
// read and process packet on tun
-void processtun(u8 * buf, int len)
+static void processtun(u8 * buf, int len)
{
LOG_HEX(5, "Receive TUN Data", buf, len);
STAT(tun_rx_packets);
// at once.
#define MAX_ACTIONS 500
-int regular_cleanups(void)
+static int regular_cleanups(void)
{
static sessionidt s = 0; // Next session to check for actions on.
tunnelidt t;
u8 b[MAXCONTROL] = {0};
u8 *q = makeppp(b, sizeof(b), 0, 0, session[s].tunnel, s, PPPLCP);
- if (!q)
- {
- LOG(3, session[s].ip, s, t, "failed to send ECHO packet.\n");
- continue;
- }
+ if (!q) continue;
*q = EchoReq;
*(u8 *)(q + 1) = (time_now % 255); // ID
// Are we in the middle of a tunnel update, or radius
// requests??
//
-int still_busy(void)
+static int still_busy(void)
{
int i;
static clockt last_talked = 0;
static int readset_n = 0;
// main loop - gets packets on tun or udp and processes them
-void mainloop(void)
+static void mainloop(void)
{
int i;
u8 buf[65536];
}
if (FD_ISSET(controlfd, &r))
- processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr);
+ processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr, alen);
if (FD_ISSET(clifd, &r))
{
}
// Init data structures
-void initdata(int optdebug, char *optconfig)
+static void initdata(int optdebug, char *optconfig)
{
int i;
LOG(0, 0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
exit(1);
}
- if (!(config = shared_malloc(sizeof(struct configt))))
+ if (!(config = shared_malloc(sizeof(configt))))
{
LOG(0, 0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno));
exit(1);
}
- memset(config, 0, sizeof(struct configt));
+ memset(config, 0, sizeof(configt));
time(&config->start_time);
strncpy(config->config_file, optconfig, strlen(optconfig));
config->debug = optdebug;
exit(1);
}
+if (!(ip_filters = shared_malloc(sizeof(ip_filtert) * MAXFILTER)))
+{
+ LOG(0, 0, 0, 0, "Error doing malloc for ip_filters: %s\n", strerror(errno));
+ exit(1);
+}
+memset(ip_filters, 0, sizeof(ip_filtert) * MAXFILTER);
+
#ifdef RINGBUFFER
if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
{
#endif /* BGP */
}
-void initiptables(void)
-{
- /* Flush the tables here so that we have a clean slate */
-
-// Not needed. 'nat' is setup by garden.c
-// mangle isn't used (as throttling is done by tbf inhouse).
-}
-
-int assign_ip_address(sessionidt s)
+static int assign_ip_address(sessionidt s)
{
u32 i;
int best = -1;
return 1;
}
-void free_ip_address(sessionidt s)
+static void free_ip_address(sessionidt s)
{
int i = session[s].ip_pool_index;
+
+ CSTAT(call_free_ip_address);
+
if (!session[s].ip)
return; // what the?
ip_address_pool[i].assigned = 0;
ip_address_pool[i].session = 0;
ip_address_pool[i].last = time_now;
-
-
- CSTAT(call_free_ip_address);
-
}
//
//
// Fix the address pool to match a changed session.
// (usually when the master sends us an update).
-void fix_address_pool(int sid)
+static void fix_address_pool(int sid)
{
int ipid;
//
// Add a block of addresses to the IP pool to hand out.
//
-void add_to_ip_pool(u32 addr, u32 mask)
+static void add_to_ip_pool(u32 addr, u32 mask)
{
int i;
if (mask == 0)
}
// Initialize the IP address pool
-void initippool()
+static void initippool()
{
FILE *f;
char *p;
STAT(packets_snooped);
}
-void dump_acct_info()
+static void dump_acct_info()
{
char filename[1024];
char timestr[64];
// Main program
int main(int argc, char *argv[])
{
- int o;
+ int i;
int optdebug = 0;
char *optconfig = CONFIGFILE;
- _program_name = strdup(argv[0]);
-
time(&basetime); // start clock
// scan args
- while ((o = getopt(argc, argv, "dvc:h:")) >= 0)
+ while ((i = getopt(argc, argv, "dvc:h:")) >= 0)
{
- switch (o)
+ switch (i)
{
- case 'd':
- if (fork()) exit(0);
- setsid();
- freopen("/dev/null", "r", stdin);
- freopen("/dev/null", "w", stdout);
- freopen("/dev/null", "w", stderr);
- break;
- case 'v':
- optdebug++;
- break;
- case 'c':
- optconfig = optarg;
- break;
- case 'h':
- snprintf(hostname, sizeof(hostname), "%s", optarg);
- break;
- default:
- printf("Args are:\n"
- "\t-d\tDetach from terminal\n"
- "\t-c <file>\tConfig file\n"
- "\t-h <hostname>\tForce hostname\n"
- "\t-a <address>\tUse specific address\n"
- "\t-v\t\tDebug\n");
-
- return (0);
- break;
+ case 'd':
+ if (fork()) exit(0);
+ setsid();
+ freopen("/dev/null", "r", stdin);
+ freopen("/dev/null", "w", stdout);
+ freopen("/dev/null", "w", stderr);
+ break;
+ case 'v':
+ optdebug++;
+ break;
+ case 'c':
+ optconfig = optarg;
+ break;
+ case 'h':
+ snprintf(hostname, sizeof(hostname), "%s", optarg);
+ break;
+ default:
+ printf("Args are:\n"
+ "\t-d\t\tDetach from terminal\n"
+ "\t-c <file>\tConfig file\n"
+ "\t-h <hostname>\tForce hostname\n"
+ "\t-v\t\tDebug\n");
+
+ return (0);
+ break;
}
}
signal(SIGALRM, sigalrm_handler);
siginterrupt(SIGALRM, 0);
- initiptables();
initplugins();
initdata(optdebug, optconfig);
}
/* Set up the cluster communications port. */
- if (cluster_init(config->bind_address) < 0)
+ if (cluster_init() < 0)
exit(1);
#ifdef BGP
signal(SIGPIPE, SIG_IGN);
bgp_setup(config->as_number);
bgp_add_route(config->bind_address, 0xffffffff);
- 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])
- bgp_start(&bgp_peers[1], config->bgp_peer[1],
- config->bgp_peer_as[1], 0);
+ for (i = 0; i < BGP_NUM_PEERS; i++)
+ {
+ if (config->neighbour[i].name[0])
+ bgp_start(&bgp_peers[i], config->neighbour[i].name,
+ config->neighbour[i].as, config->neighbour[i].keepalive,
+ config->neighbour[i].hold, 0); /* 0 = routing disabled */
+ }
#endif /* BGP */
inittun();
#ifdef BGP
/* try to shut BGP down cleanly; with luck the sockets will be
writable since we're out of the select */
- {
- int i;
- for (i = 0; i < BGP_NUM_PEERS; i++)
- if (bgp_peers[i].state == Established)
- bgp_stop(&bgp_peers[i]);
- }
+ for (i = 0; i < BGP_NUM_PEERS; i++)
+ if (bgp_peers[i].state == Established)
+ bgp_stop(&bgp_peers[i]);
#endif /* BGP */
/* remove plugins (so cleanup code gets run) */
return 0;
}
-void sighup_handler(int junk)
+static void sighup_handler(int sig)
{
if (log_stream && log_stream != stderr)
{
read_config_file();
}
-void sigalrm_handler(int junk)
+static void sigalrm_handler(int sig)
{
// Log current traffic stats
}
-void sigterm_handler(int junk)
+static void sigterm_handler(int sig)
{
LOG(1, 0, 0, 0, "Shutting down cleanly\n");
if (config->save_state)
main_quit++;
}
-void sigquit_handler(int junk)
+static void sigquit_handler(int sig)
{
int i;
main_quit++;
}
-void sigchild_handler(int signal)
+static void sigchild_handler(int sig)
{
while (waitpid(-1, NULL, WNOHANG) > 0)
;
}
-void read_state()
+static void read_state()
{
struct stat sb;
int i;
LOG(0, 0, 0, 0, "Loaded saved state information\n");
}
-void dump_state()
+static void dump_state()
{
FILE *f;
u32 buf[2];
unlink(STATEFILE);
}
-void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response)
+static void build_chap_response(char *challenge, u8 id, u16 challenge_length, char **challenge_response)
{
MD5_CTX ctx;
*challenge_response = NULL;
return 0;
}
-void update_config()
+static void update_config()
{
int i;
static int timeout = 0;
{
if (strcmp(config->plugins[i], config->old_plugins[i]) == 0)
continue;
+
if (*config->plugins[i])
{
// Plugin added
config->reload_config = 0;
}
-void read_config_file()
+static void read_config_file()
{
FILE *f;
}
}
+ {
+ int routed = 0;
+
// Add the route for this session.
- //
- // Static IPs need to be routed. Anything else
- // is part of the IP address pool and is already routed,
- // it just needs to be added to the IP cache.
- if (session[s].ip_pool_index == -1) // static ip
- routeset(s, session[s].ip, 0, 0, 1);
- else
- cache_ipmap(session[s].ip, s);
+ for (r = 0; r < MAXROUTE && session[s].route[r].ip; r++)
+ {
+ if ((session[s].ip & session[s].route[r].mask) ==
+ (session[s].route[r].ip & session[s].route[r].mask))
+ routed++;
+
+ routeset(s, session[s].route[r].ip, session[s].route[r].mask, 0, 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);
+ // Static IPs need to be routed if not already
+ // convered by a Framed-Route. Anything else is part
+ // of the IP address pool and is already routed, it
+ // just needs to be added to the IP cache.
+ if (session[s].ip_pool_index == -1) // static ip
+ {
+ if (!routed) routeset(s, session[s].ip, 0, 0, 1);
+ }
+ else
+ cache_ipmap(session[s].ip, s);
+ }
if (!session[s].unique_id)
{
int load_session(sessionidt s, sessiont *new)
{
int i;
+ int newip = 0;
// Sanity checks.
if (new->ip_pool_index >= MAXIPPOOL ||
session[s].tunnel = new->tunnel; // For logging in cache_ipmap
+ // See if routes/ip cache need updating
+ if (new->ip != session[s].ip)
+ newip++;
+
+ for (i = 0; !newip && i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
+ if (new->route[i].ip != session[s].route[i].ip ||
+ new->route[i].mask != session[s].route[i].mask)
+ newip++;
- if (new->ip != session[s].ip) // Changed ip. fix up hash tables.
+ // needs update
+ if (newip)
{
- if (session[s].ip) // If there's an old one, remove it.
+ int routed = 0;
+
+ // remove old routes...
+ for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
{
- // Remove any routes if the IP has changed
- for (i = 0; i < MAXROUTE && session[s].route[i].ip; i++)
- {
- routeset(s, session[s].route[i].ip, session[s].route[i].mask, session[s].ip, 0);
- session[s].route[i].ip = 0;
- }
+ if ((session[s].ip & session[s].route[i].mask) ==
+ (session[s].route[i].ip & session[s].route[i].mask))
+ routed++;
+
+ routeset(s, session[s].route[i].ip, session[s].route[i].mask, 0, 0);
+ }
+ // ...ip
+ if (session[s].ip)
+ {
if (session[s].ip_pool_index == -1) // static IP
- routeset(s, session[s].ip, 0, 0, 0);
+ {
+ if (!routed) routeset(s, session[s].ip, 0, 0, 0);
+ }
else // It's part of the IP pool, remove it manually.
uncache_ipmap(session[s].ip);
}
+ routed = 0;
+
+ // add new routes...
+ for (i = 0; i < MAXROUTE && new->route[i].ip; i++)
+ {
+ if ((new->ip & new->route[i].mask) ==
+ (new->route[i].ip & new->route[i].mask))
+ routed++;
+
+ routeset(s, new->route[i].ip, new->route[i].mask, 0, 1);
+ }
+
+ // ...ip
if (new->ip)
{
// If there's a new one, add it.
if (new->ip_pool_index == -1)
- routeset(s, new->ip, 0, 0, 1);
+ {
+ if (!routed) routeset(s, new->ip, 0, 0, 1);
+ }
else
cache_ipmap(new->ip, s);
}
}
- // Update routed networks
- for (i = 0; i < MAXROUTE && (session[s].route[i].ip || new->route[i].ip); i++)
- {
- if (new->route[i].ip == session[s].route[i].ip &&
- new->route[i].mask == session[s].route[i].mask)
- continue;
-
- if (session[s].route[i].ip) // Remove the old one if it exists.
- routeset(s, session[s].route[i].ip, session[s].route[i].mask, session[s].ip, 0);
-
- if (new->route[i].ip) // Add the new one if it exists.
- routeset(s, new->route[i].ip, new->route[i].mask, new->ip, 1);
- }
-
if (new->tunnel && s > config->cluster_highest_sessionid) // Maintain this in the slave. It's used
// for walking the sessions to forward byte counts to the master.
config->cluster_highest_sessionid = s;
return 1;
}
-#ifdef RINGBUFFER
-void ringbuffer_dump(FILE *stream)
-{
- int i = ringbuffer->head;
-
- while (i != ringbuffer->tail)
- {
- if (*ringbuffer->buffer[i].message)
- fprintf(stream, "%d-%s", ringbuffer->buffer[i].level, ringbuffer->buffer[i].message);
- if (++i == ringbuffer->tail) break;
- if (i == RINGBUFFER_SIZE) i = 0;
- }
-}
-#endif
-
-void initplugins()
+static void initplugins()
{
int i;
return dlopen(path, RTLD_NOW);
}
-void add_plugin(char *plugin_name)
+// plugin callback to get a config value
+static void *getconfig(char *key, enum config_typet type)
+{
+ int i;
+
+ for (i = 0; config_values[i].key; i++)
+ {
+ if (!strcmp(config_values[i].key, key))
+ {
+ if (config_values[i].type == type)
+ return ((void *) config) + config_values[i].offset;
+
+ LOG(1, 0, 0, 0, "plugin requested config item \"%s\" expecting type %d, have type %d\n",
+ key, type, config_values[i].type);
+
+ return 0;
+ }
+ }
+
+ LOG(1, 0, 0, 0, "plugin requested unknown config item \"%s\"\n", key);
+ return 0;
+}
+
+static int add_plugin(char *plugin_name)
{
static struct pluginfuncs funcs = {
_log,
sessionbyuser,
sessiontbysessionidt,
sessionidtbysessiont,
- sessionkill,
radiusnew,
radiussend,
+ getconfig,
+ sessionkill,
+ throttle_session,
+ cluster_send_session,
};
void *p = open_plugin(plugin_name, 1);
if (!p)
{
LOG(1, 0, 0, 0, " Plugin load failed: %s\n", dlerror());
- return;
+ return -1;
}
if (ll_contains(loaded_plugins, p))
{
dlclose(p);
- return;
+ return 0; // already loaded
}
{
- int *v = dlsym(p, "__plugin_api_version");
+ int *v = dlsym(p, "plugin_api_version");
if (!v || *v != PLUGIN_API_VERSION)
{
LOG(1, 0, 0, 0, " Plugin load failed: API version mismatch: %s\n", dlerror());
dlclose(p);
- return;
+ return -1;
}
}
{
LOG(1, 0, 0, 0, " Plugin load failed: plugin_init() returned FALSE: %s\n", dlerror());
dlclose(p);
- return;
+ return -1;
}
}
}
LOG(2, 0, 0, 0, " Loaded plugin %s\n", plugin_name);
+ return 1;
}
static void run_plugin_done(void *plugin)
donefunc();
}
-void remove_plugin(char *plugin_name)
+static int remove_plugin(char *plugin_name)
{
void *p = open_plugin(plugin_name, 0);
- int i;
+ int loaded = 0;
if (!p)
- return;
-
- for (i = 0; i < max_plugin_functions; i++)
- {
- void *x;
- if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
- ll_delete(plugins[i], x);
- }
+ return -1;
if (ll_contains(loaded_plugins, p))
{
+ int i;
+ for (i = 0; i < max_plugin_functions; i++)
+ {
+ void *x;
+ if (plugin_functions[i] && (x = dlsym(p, plugin_functions[i])))
+ ll_delete(plugins[i], x);
+ }
+
ll_delete(loaded_plugins, p);
run_plugin_done(p);
+ loaded = 1;
}
dlclose(p);
LOG(2, 0, 0, 0, "Removed plugin %s\n", plugin_name);
+ return loaded;
}
int run_plugins(int plugin_type, void *data)
{
int (*func)(void *data);
- if (!plugins[plugin_type] || plugin_type > max_plugin_functions) return 1;
+
+ if (!plugins[plugin_type] || plugin_type > max_plugin_functions)
+ return PLUGIN_RET_ERROR;
ll_reset(plugins[plugin_type]);
while ((func = ll_next(plugins[plugin_type])))
{
- int rc;
- rc = func(data);
- if (rc == PLUGIN_RET_STOP) return 1;
- if (rc == PLUGIN_RET_ERROR) return 0;
+ int r = func(data);
+
+ if (r != PLUGIN_RET_OK)
+ return r; // stop here
}
- return 1;
+
+ return PLUGIN_RET_OK;
}
-void plugins_done()
+static void plugins_done()
{
void *p;
run_plugin_done(p);
}
-void processcontrol(u8 * buf, int len, struct sockaddr_in *addr)
+static void processcontrol(u8 * buf, int len, struct sockaddr_in *addr, int alen)
{
- char *resp;
- int l;
- struct param_control param = { buf, len, ntohl(addr->sin_addr.s_addr), ntohs(addr->sin_port), NULL, 0, 0 };
-
+ struct nsctl request;
+ struct nsctl response;
+ int type = unpack_control(&request, buf, len);
+ int r;
+ void *p;
if (log_stream && config->debug >= 4)
{
- LOG(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Received ");
- dump_packet(buf, log_stream);
+ if (type < 0)
+ {
+ LOG(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Bogus control message (%d)\n", type);
+ }
+ else
+ {
+ LOG(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Received ");
+ dump_control(&request, log_stream);
+ }
}
- resp = calloc(1400, 1);
- l = new_packet(PKT_RESP_ERROR, resp);
- *(int *)(resp + 6) = *(int *)(buf + 6);
+ switch (type)
+ {
+ case NSCTL_REQ_LOAD:
+ if (request.argc != 1)
+ {
+ response.type = NSCTL_RES_ERR;
+ response.argc = 1;
+ response.argv[0] = "name of plugin required";
+ }
+ else if ((r = add_plugin(request.argv[0])) < 1)
+ {
+ response.type = NSCTL_RES_ERR;
+ response.argc = 1;
+ response.argv[0] = !r
+ ? "plugin already loaded"
+ : "error loading plugin";
+ }
+ else
+ {
+ response.type = NSCTL_RES_OK;
+ response.argc = 0;
+ }
- param.type = ntohs(*(short *)(buf + 2));
- param.id = ntohl(*(int *)(buf + 6));
- param.data_length = ntohs(*(short *)(buf + 4)) - 10;
- param.data = (param.data_length > 0) ? (char *)(buf + 10) : NULL;
- param.response = resp;
- param.response_length = l;
+ break;
- run_plugins(PLUGIN_CONTROL, ¶m);
+ case NSCTL_REQ_UNLOAD:
+ if (request.argc != 1)
+ {
+ response.type = NSCTL_RES_ERR;
+ response.argc = 1;
+ response.argv[0] = "name of plugin required";
+ }
+ else if ((r = remove_plugin(request.argv[0])) < 1)
+ {
+ response.type = NSCTL_RES_ERR;
+ response.argc = 1;
+ response.argv[0] = !r
+ ? "plugin not loaded"
+ : "plugin not found";
+ }
+ else
+ {
+ response.type = NSCTL_RES_OK;
+ response.argc = 0;
+ }
- if (param.send_response)
- {
- send_packet(controlfd, ntohl(addr->sin_addr.s_addr), ntohs(addr->sin_port), param.response, param.response_length);
- LOG(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Sent Control packet response\n");
- }
+ break;
- free(resp);
-}
+ case NSCTL_REQ_HELP:
+ response.type = NSCTL_RES_OK;
+ response.argc = 0;
-/*
- * HACK
- * Go through all of the tunnels and do some cleanups
- */
-void tunnel_clean()
-{
- int i;
+ ll_reset(loaded_plugins);
+ while ((p = ll_next(loaded_plugins)))
+ {
+ char **help = dlsym(p, "plugin_control_help");
+ while (response.argc < 0xff && help && *help)
+ response.argv[response.argc++] = *help++;
+ }
- LOG(1, 0, 0, 0, "Cleaning tunnels array\n");
+ break;
- for (i = 1; i < MAXTUNNEL; i++)
+ case NSCTL_REQ_CONTROL:
+ {
+ struct param_control param = {
+ config->cluster_iam_master,
+ request.argc,
+ request.argv,
+ 0,
+ NULL,
+ };
+
+ int r = run_plugins(PLUGIN_CONTROL, ¶m);
+
+ if (r == PLUGIN_RET_ERROR)
+ {
+ response.type = NSCTL_RES_ERR;
+ response.argc = 1;
+ response.argv[0] = param.additional
+ ? param.additional
+ : "error returned by plugin";
+ }
+ else if (r == PLUGIN_RET_NOTMASTER)
+ {
+ static char msg[] = "must be run on master: 000.000.000.000";
+
+ response.type = NSCTL_RES_ERR;
+ response.argc = 1;
+ if (config->cluster_master_address)
+ {
+ strcpy(msg + 23, inet_toa(config->cluster_master_address));
+ response.argv[0] = msg;
+ }
+ else
+ {
+ response.argv[0] = "must be run on master: none elected";
+ }
+ }
+ else if (!(param.response & NSCTL_RESPONSE))
+ {
+ response.type = NSCTL_RES_ERR;
+ response.argc = 1;
+ response.argv[0] = param.response
+ ? "unrecognised response value from plugin"
+ : "unhandled action";
+ }
+ else
+ {
+ response.type = param.response;
+ response.argc = 0;
+ if (param.additional)
+ {
+ response.argc = 1;
+ response.argv[0] = param.additional;
+ }
+ }
+ }
+
+ break;
+
+ default:
+ response.type = NSCTL_RES_ERR;
+ response.argc = 1;
+ response.argv[0] = "error unpacking control packet";
+ }
+
+ buf = calloc(NSCTL_MAX_PKT_SZ, 1);
+ if (!buf)
+ {
+ LOG(2, ntohl(addr->sin_addr.s_addr), 0, 0, "Failed to allocate nsctl response\n");
+ return;
+ }
+
+ r = pack_control(buf, NSCTL_MAX_PKT_SZ, response.type, response.argc, response.argv);
+ if (r > 0)
{
- if (!tunnel[i].ip
- || !*tunnel[i].hostname
- || (tunnel[i].state == TUNNELDIE && tunnel[i].die >= time_now))
+ sendto(controlfd, buf, r, 0, (const struct sockaddr *) addr, alen);
+ if (log_stream && config->debug >= 4)
{
- tunnelclear(i);
+ LOG(4, ntohl(addr->sin_addr.s_addr), 0, 0, "Sent ");
+ dump_control(&response, log_stream);
}
}
-}
+ else
+ LOG(2, ntohl(addr->sin_addr.s_addr), 0, 0, "Failed to pack nsctl response (%d)\n", r);
-void tunnelclear(tunnelidt t)
-{
- if (!t) return;
- memset(&tunnel[t], 0, sizeof(tunnel[t]));
- tunnel[t].state = TUNNELFREE;
+ free(buf);
}
-tunnelidt new_tunnel()
+static tunnelidt new_tunnel()
{
tunnelidt i;
for (i = 1; i < MAXTUNNEL; i++)
// add radius fds
for (i = 0; i < config->num_radfds; i++)
{
- if (!radfds[i]) continue;
FD_SET(radfds[i], &readset);
if (radfds[i] > readset_n)
readset_n = radfds[i];
*
* Based on code from rp-l2tpd by Roaring Penguin Software Inc.
*/
-int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length)
+static int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length)
{
MD5_CTX ctx;
u8 *cursor;
projects / l2tpns.git / blobdiff