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xl2tpd.c
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xl2tpd.c
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/*
* Layer Two Tunnelling Protocol Daemon
* Copyright (C) 1998 Adtran, Inc.
* Copyright (C) 2002 Jeff McAdams
*
*
* Mark Spencer
*
* This software is distributed under the terms
* of the GPL, which you should have received
* along with this source.
*
* Main Daemon source.
*
*/
#define _ISOC99_SOURCE
#define _XOPEN_SOURCE
#define _BSD_SOURCE
#define _DEFAULT_SOURCE
#define _XOPEN_SOURCE_EXTENDED 1
#define _GNU_SOURCE
#include <stdlib.h>
#include <sys/types.h>
#include <sys/utsname.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <signal.h>
#ifndef LINUX
# include <sys/socket.h>
#endif
#include <netdb.h>
#include <string.h>
#include <strings.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "l2tp.h"
struct tunnel_list tunnels;
int rand_source;
int ppd = 1; /* Packet processing delay */
int control_fd; /* descriptor of control area */
static char *dial_no_tmp; /* jz: Dialnumber for Outgoing Call */
int switch_io = 0; /* jz: Switch for Incoming or Outgoing Call */
static void open_controlfd(void);
static volatile sig_atomic_t sigterm_received;
static volatile sig_atomic_t sigint_received;
static volatile sig_atomic_t sigchld_received;
static volatile sig_atomic_t sigusr1_received;;
static volatile sig_atomic_t sighup_received;
struct control_requests_handler {
char type;
int (*handler) (FILE* resf, char* bufp);
};
static int control_handle_available(FILE* resf, char* bufp);
static int control_handle_lns_add_modify(FILE* resf, char* bufp);
static int control_handle_lns_status(FILE* resf, char* bufp);
static int control_handle_tunnel(FILE* respf, char* bufp);
static int control_handle_lac_connect(FILE* resf, char* bufp);
static int control_handle_lac_outgoing_call(FILE* resf, char* bufp);
static int control_handle_lac_hangup(FILE* resf, char* bufp);
static int control_handle_lac_disconnect(FILE* resf, char* bufp);
static int control_handle_lac_add_modify(FILE* resf, char* bufp);
static int control_handle_lac_remove(FILE* resf, char* bufp);
static int control_handle_lac_status();
static int control_handle_lns_remove(FILE* resf, char* bufp);
static struct control_requests_handler control_handlers[] = {
{CONTROL_PIPE_REQ_AVAILABLE, &control_handle_available},
{CONTROL_PIPE_REQ_LNS_ADD_MODIFY, &control_handle_lns_add_modify},
{CONTROL_PIPE_REQ_LNS_STATUS, &control_handle_lns_status},
{CONTROL_PIPE_REQ_TUNNEL, &control_handle_tunnel},
{CONTROL_PIPE_REQ_LAC_CONNECT, &control_handle_lac_connect},
{CONTROL_PIPE_REQ_LAC_OUTGOING_CALL, &control_handle_lac_outgoing_call},
{CONTROL_PIPE_REQ_LAC_HANGUP, &control_handle_lac_hangup},
{CONTROL_PIPE_REQ_LAC_DISCONNECT, &control_handle_lac_disconnect},
{CONTROL_PIPE_REQ_LAC_ADD_MODIFY, &control_handle_lac_add_modify},
{CONTROL_PIPE_REQ_LAC_REMOVE, &control_handle_lac_remove},
{CONTROL_PIPE_REQ_LAC_STATUS, &control_handle_lac_status},
{CONTROL_PIPE_REQ_LNS_REMOVE, &control_handle_lns_remove},
{0, NULL}
};
static void init_tunnel_list (struct tunnel_list *t)
{
t->head = NULL;
t->count = 0;
t->calls = 0;
}
/* Now sends to syslog instead - MvO */
static void show_status (void)
{
struct schedule_entry *se;
struct tunnel *t;
struct call *c;
struct lns *tlns;
struct lac *tlac;
struct host *h;
unsigned long cnt = 0;
int s = 0;
l2tp_log (LOG_WARNING, "====== xl2tpd statistics ========\n");
l2tp_log (LOG_WARNING, " Scheduler entries:\n");
se = events;
while (se)
{
s++;
t = (struct tunnel *) se->data;
tlac = (struct lac *) se->data;
c = (struct call *) se->data;
if (se->func == &hello)
{
l2tp_log (LOG_WARNING, "%d: HELLO to %d\n", s, t->tid);
}
else if (se->func == &magic_lac_dial)
{
l2tp_log (LOG_WARNING, "%d: Magic dial on %s\n", s, tlac->entname);
}
else if (se->func == &send_zlb)
{
l2tp_log (LOG_WARNING, "%d: Send payload ZLB on call %d:%d\n", s,
c->container->tid, c->cid);
}
else if (se->func == &dethrottle)
{
l2tp_log (LOG_WARNING, "%d: Dethrottle call %d:%d\n", s, c->container->tid,
c->cid);
}
else if (se->func == &control_xmit)
{
l2tp_log (LOG_WARNING, "%d: Control xmit on %d\n", s,((struct buffer *)se->data)->tunnel->tid);
}
else
l2tp_log (LOG_WARNING, "%d: Unknown event\n", s);
se = se->next;
};
l2tp_log (LOG_WARNING, "Total Events scheduled: %d\n", s);
l2tp_log (LOG_WARNING, "Number of tunnels open: %d\n", tunnels.count);
t = tunnels.head;
while (t)
{
l2tp_log (LOG_WARNING, "Tunnel %s, ID = %d (local), %d (remote) to %s:%d,"
" control_seq_num = %d, control_rec_seq_num = %d,"
" cLr = %d, call count = %d ref=%u/refhim=%u",
(t->lac ? t->lac->entname : (t->lns ? t->lns->entname : "")),
t->ourtid, t->tid, IPADDY (t->peer.sin_addr),
ntohs (t->peer.sin_port), t->control_seq_num,
t->control_rec_seq_num, t->cLr, t->count,
t->refme, t->refhim);
c = t->call_head;
while (c)
{
cnt++;
l2tp_log (LOG_WARNING,
"Call %s # %lu, ID = %d (local), %d (remote), serno = %u,"
" data_seq_num = %d, data_rec_seq_num = %d,"
" pLr = %d, tx = %u bytes (%u), rx= %u bytes (%u)",
(c->lac ? c->lac->
entname : (c->lns ? c->lns->entname : "")),
cnt, c->ourcid,
c->cid, c->serno, c->data_seq_num, c->data_rec_seq_num,
c->pLr, c->tx_bytes, c->tx_pkts, c->rx_bytes, c->rx_pkts);
c = c->next;
}
t = t->next;
}
l2tp_log (LOG_WARNING, "==========Config File===========\n");
tlns = lnslist;
while (tlns)
{
l2tp_log (LOG_WARNING, "LNS entry %s\n",
tlns->entname[0] ? tlns->entname : "(unnamed)");
tlns = tlns->next;
};
tlac = laclist;
while (tlac)
{
l2tp_log (LOG_WARNING, "LAC entry %s, LNS is/are:",
tlac->entname[0] ? tlac->entname : "(unnamed)");
h = tlac->lns;
if (h)
{
while (h)
{
l2tp_log (LOG_WARNING, " %s", h->hostname);
h = h->next;
}
}
else
l2tp_log (LOG_WARNING, " [none]");
tlac = tlac->next;
};
l2tp_log (LOG_WARNING, "================================\n");
}
static void null_handler(int sig)
{
UNUSED(sig);
/* FIXME
* A sighup is received when a call is terminated, unknown origine ..
* I catch it and ll looks good, but ..
*/
}
static void status_handler (int sig)
{
UNUSED(sig);
show_status ();
}
static void child_handler (int sig)
{
UNUSED(sig);
/*
* Oops, somebody we launched was killed.
* It's time to reap them and close that call.
* But first, we have to find out what PID died.
* unfortunately, pppd will
*/
struct tunnel *t;
struct call *c;
pid_t pid;
int status;
/* Keep looping until all are cleared */
for(;;)
{
pid = waitpid (-1, &status, WNOHANG);
if (pid < 1)
{
/*
* Oh well, nobody there. Maybe we reaped it
* somewhere else already
*/
return;
}
/* find the call that "owned" the pppd which just died */
t = tunnels.head;
while (t)
{
c = t->call_head;
t = t->next;
while (c)
{
if (c->pppd == pid)
{
if ( WIFEXITED( status ) )
{
l2tp_log (LOG_DEBUG, "%s : pppd exited for call %d with code %d\n", __FUNCTION__,
c->cid, WEXITSTATUS( status ) );
}
else if( WIFSIGNALED( status ) )
{
l2tp_log (LOG_DEBUG, "%s : pppd terminated for call %d by signal %d\n", __FUNCTION__,
c->cid, WTERMSIG( status ) );
}
else
{
l2tp_log (LOG_DEBUG, "%s : pppd exited for call %d for unknown reason\n", __FUNCTION__,
c->cid );
}
c->needclose = -1;
/*
* OK...pppd died, we can go ahead and close the pty for
* it
*/
#ifdef USE_KERNEL
if (!kernel_support) {
#endif
close (c->fd);
#ifdef USE_KERNEL
}
#endif
c->fd = -1;
/*
* terminate tunnel and call loops, returning to the
* for(;;) loop (and possibly get the next pid)
*/
t = NULL;
break;
}
c = c->next;
}
}
}
}
static void death_handler (int signal)
{
/*
* If we get here, somebody terminated us with a kill or a control-c.
* we call call_close on each tunnel twice to get a StopCCN out
* for each one (we can't pause to make sure it's received.
* Then we close the connections
*/
struct tunnel *st, *st2;
int sec;
l2tp_log (LOG_CRIT, "%s: Fatal signal %d received\n", __FUNCTION__, signal);
#ifdef USE_KERNEL
if (kernel_support || signal != SIGTERM) {
#else
if (signal != SIGTERM) {
#endif
st = tunnels.head;
while (st)
{
st2 = st->next;
strcpy (st->self->errormsg, "Server closing");
sec = st->self->closing;
if (st->lac)
st->lac->redial = 0;
call_close (st->self);
if (!sec)
{
st->self->closing = -1;
call_close (st->self);
}
st = st2;
}
}
/* erase pid and control files */
unlink (gconfig.pidfile);
unlink (gconfig.controlfile);
free(dial_no_tmp);
close(server_socket);
close(control_fd);
closelog();
exit (1);
}
static void sigterm_handler(int sig)
{
UNUSED(sig);
sigterm_received = 1;
}
static void sigint_handler(int sig)
{
UNUSED(sig);
sigint_received = 1;
}
static void sigchld_handler(int sig)
{
UNUSED(sig);
sigchld_received = 1;
}
static void sigusr1_handler(int sig)
{
UNUSED(sig);
sigusr1_received = 1;
}
static void sighup_handler(int sig)
{
UNUSED(sig);
sighup_received = 1;
}
void process_signal(void)
{
if (sigterm_received) { sigterm_received = 0; death_handler(SIGTERM); }
if (sigint_received) { sigint_received = 0; death_handler(SIGINT); }
if (sigchld_received) { sigchld_received = 0; child_handler(SIGCHLD); }
if (sigusr1_received) { sigusr1_received = 0; status_handler(SIGUSR1); }
if (sighup_received) { sighup_received = 0; null_handler(SIGHUP); }
}
int start_pppd (struct call *c, struct ppp_opts *opts)
{
/* char a, b; */
char tty[512];
char *stropt[80];
#ifdef USE_KERNEL
struct sockaddr_pppol2tp sax;
int flags;
#endif
int pos = 1;
int fd2 = -1;
#ifdef DEBUG_PPPD
int x;
#endif
struct termios ptyconf;
struct call *sc;
struct tunnel *st;
stropt[0] = strdup (PPPD);
if (c->pppd > 0)
{
l2tp_log(LOG_WARNING, "%s: PPP already started on call!\n", __FUNCTION__);
return -EINVAL;
}
if (c->fd > -1)
{
l2tp_log (LOG_WARNING, "%s: file descriptor already assigned!\n",
__FUNCTION__);
return -EINVAL;
}
#ifdef USE_KERNEL
if (kernel_support)
{
fd2 = socket(AF_PPPOX, SOCK_DGRAM, PX_PROTO_OL2TP);
if (fd2 < 0) {
l2tp_log (LOG_WARNING, "%s: Unable to allocate PPPoL2TP socket.\n",
__FUNCTION__);
return -EINVAL;
}
flags = fcntl(fd2, F_GETFL);
if (flags == -1 || fcntl(fd2, F_SETFL, flags | O_NONBLOCK) == -1) {
l2tp_log (LOG_WARNING, "%s: Unable to set PPPoL2TP socket nonblock.\n",
__FUNCTION__);
return -EINVAL;
}
memset(&sax, 0, sizeof(sax));
sax.sa_family = AF_PPPOX;
sax.sa_protocol = PX_PROTO_OL2TP;
sax.pppol2tp.fd = c->container->udp_fd;
sax.pppol2tp.addr.sin_addr.s_addr = c->container->peer.sin_addr.s_addr;
sax.pppol2tp.addr.sin_port = c->container->peer.sin_port;
sax.pppol2tp.addr.sin_family = AF_INET;
sax.pppol2tp.s_tunnel = c->container->ourtid;
sax.pppol2tp.s_session = c->ourcid;
sax.pppol2tp.d_tunnel = c->container->tid;
sax.pppol2tp.d_session = c->cid;
if (connect(fd2, (struct sockaddr *)&sax, sizeof(sax)) < 0) {
l2tp_log (LOG_WARNING, "%s: Unable to connect PPPoL2TP socket.\n",
__FUNCTION__);
close(fd2);
return -EINVAL;
}
stropt[pos++] = strdup ("plugin");
stropt[pos++] = strdup ("pppol2tp.so");
stropt[pos++] = strdup ("pppol2tp");
stropt[pos] = malloc (11);
snprintf (stropt[pos], 11, "%d", fd2);
pos++;
if (c->container->lns) {
stropt[pos++] = strdup ("pppol2tp_lns_mode");
stropt[pos++] = strdup ("pppol2tp_tunnel_id");
stropt[pos] = malloc (11);
snprintf (stropt[pos], 11, "%d", c->container->ourtid);
pos++;
stropt[pos++] = strdup ("pppol2tp_session_id");
stropt[pos] = malloc (11);
snprintf (stropt[pos], 11, "%d", c->ourcid);
pos++;
}
}
else
#endif
{
if ((c->fd = getPtyMaster (tty, sizeof(tty))) < 0)
{
l2tp_log (LOG_WARNING, "%s: unable to allocate pty, abandoning!\n",
__FUNCTION__);
return -EINVAL;
}
/* set fd opened above to not echo so we don't see read our own packets
back of the file descriptor that we just wrote them to */
tcgetattr (c->fd, &ptyconf);
*(c->oldptyconf) = ptyconf;
ptyconf.c_cflag &= ~(ICANON | ECHO);
ptyconf.c_lflag &= ~ECHO;
tcsetattr (c->fd, TCSANOW, &ptyconf);
if(fcntl(c->fd, F_SETFL, O_NONBLOCK)!=0) {
l2tp_log(LOG_WARNING, "failed to set nonblock: %s\n", strerror(errno));
return -EINVAL;
}
fd2 = open (tty, O_RDWR);
if (fd2 < 0) {
l2tp_log (LOG_WARNING, "unable to open tty %s, cannot start pppd", tty);
return -EINVAL;
}
stropt[pos++] = strdup(tty);
}
{
struct ppp_opts *p = opts;
int maxn_opts = sizeof(stropt) / sizeof(stropt[0]) - 1;
while (p && pos < maxn_opts)
{
stropt[pos] = strdup (p->option);
pos++;
p = p->next;
}
stropt[pos] = NULL;
}
#ifdef DEBUG_PPPD
l2tp_log (LOG_DEBUG, "%s: I'm running: \n", __FUNCTION__);
for (x = 0; stropt[x]; x++)
{
l2tp_log (LOG_DEBUG, "\"%s\" \n", stropt[x]);
};
#endif
#ifdef __uClinux__
c->pppd = vfork ();
#else
c->pppd = fork ();
#endif
if (c->pppd < 0)
{
/* parent */
l2tp_log(LOG_WARNING,"%s: unable to fork(), abandoning!\n", __FUNCTION__);
close(fd2);
return -EINVAL;
}
else if (!c->pppd)
{
/* child */
close (0); /* redundant; the dup2() below would do that, too */
close (1); /* ditto */
/* close (2); No, we want to keep the connection to /dev/null. */
#ifdef USE_KERNEL
if (!kernel_support)
#endif
{
/* connect the pty to stdin and stdout */
dup2 (fd2, 0);
dup2 (fd2, 1);
close(fd2);
}
/* close all the calls pty fds */
st = tunnels.head;
while (st)
{
#ifdef USE_KERNEL
if (kernel_support) {
if(st->udp_fd!=-1)
close(st->udp_fd); /* tunnel UDP fd */
if(st->pppox_fd!=-1)
close(st->pppox_fd); /* tunnel PPPoX fd */
} else
#endif
{
sc = st->call_head;
while (sc)
{
if(sc->fd!=-1)
close (sc->fd); /* call pty fd */
sc = sc->next;
}
}
st = st->next;
}
/* close the UDP socket fd */
if(server_socket!=-1)
close (server_socket);
/* close the control pipe fd */
if(control_fd!=-1)
close (control_fd);
if( c->dialing[0] )
{
setenv( "CALLER_ID", c->dialing, 1 );
}
execv (PPPD, stropt);
l2tp_log (LOG_WARNING, "%s: Exec of %s failed!\n", __FUNCTION__, PPPD);
_exit (1);
}
close (fd2);
pos = 0;
while (stropt[pos])
{
free (stropt[pos]);
pos++;
};
return 0;
}
void destroy_tunnel (struct tunnel *t)
{
/*
* Immediately destroy a tunnel (and all its calls)
* and free its resources. This may be called
* by the tunnel itself,so it needs to be
* "suicide safe"
*/
struct call *c, *me, *next;
struct tunnel *p;
struct timeval tv;
if (!t)
return;
/*
* Save ourselves until the very
* end, since we might be calling this ourselves.
* We must divorce ourself from the tunnel
* structure, however, to avoid recursion
* because of the logic of the destroy_call
*/
me = t->self;
/*
* Destroy all the member calls
*/
c = t->call_head;
while (c)
{
next = c->next;
destroy_call (c);
c = next;
};
/*
* Remove ourselves from the list of tunnels
*/
if (tunnels.head == t)
{
tunnels.head = t->next;
tunnels.count--;
}
else
{
p = tunnels.head;
if (p)
{
while (p->next && (p->next != t))
p = p->next;
if (p->next)
{
p->next = t->next;
tunnels.count--;
}
else
{
l2tp_log (LOG_WARNING,
"%s: unable to locate tunnel in tunnel list\n",
__FUNCTION__);
}
}
else
{
l2tp_log (LOG_WARNING, "%s: tunnel list is empty!\n", __FUNCTION__);
}
}
if (t->lac)
{
t->lac->t = NULL;
if (t->lac->redial && (t->lac->rtimeout > 0) && !t->lac->rsched &&
t->lac->active)
{
l2tp_log (LOG_INFO, "Will redial in %d seconds\n",
t->lac->rtimeout);
tv.tv_sec = t->lac->rtimeout;
tv.tv_usec = 0;
t->lac->rsched = schedule (tv, magic_lac_dial, t->lac);
}
}
/* XXX L2TP/IPSec: remove relevant SAs here? NTB 20011010
* XXX But what if another tunnel is using same SA?
*/
if (t->lns)
t->lns->t = NULL;
if (t->chal_us.challenge)
free (t->chal_us.challenge);
if (t->chal_them.challenge)
free (t->chal_them.challenge);
/* we need no free(t->chal_us.vector) here because we malloc() and free()
the memory pointed to by t->chal_us.vector at some other place */
if (t->chal_them.vector)
free (t->chal_them.vector);
if (t->pppox_fd > -1 )
close (t->pppox_fd);
if (t->udp_fd > -1 )
close (t->udp_fd);
destroy_call (me);
free (t);
}
static struct tunnel *l2tp_call (char *host, int port, struct lac *lac,
struct lns *lns)
{
/*
* Establish a tunnel from us to host
* on port port
*/
struct call *tmp = NULL;
struct hostent *hp;
struct in_addr addr;
port = htons (port);
hp = gethostbyname (host);
if (!hp)
{
l2tp_log (LOG_WARNING, "Host name lookup failed for %s.\n",
host);
return NULL;
}
bcopy (hp->h_addr, &addr.s_addr, hp->h_length);
/* Force creation of a new tunnel
and set it's tid to 0 to cause
negotiation to occur */
/*
* to do IPsec properly here, we need to set a socket policy,
* and/or communicate with pluto.
*/
tmp = get_call (0, 0, addr, port, IPSEC_SAREF_NULL, IPSEC_SAREF_NULL);
if (!tmp)
{
l2tp_log (LOG_WARNING, "%s: Unable to create tunnel to %s.\n", __FUNCTION__,
host);
return NULL;
}
tmp->container->tid = 0;
tmp->container->lac = lac;
tmp->container->lns = lns;
tmp->lac = lac;
tmp->lns = lns;
if (lac)
lac->t = tmp->container;
if (lns)
lns->t = tmp->container;
/*
* Since our state is 0, we will establish a tunnel now
*/
l2tp_log (LOG_NOTICE, "Connecting to host %s, port %d\n", host,
ntohs (port));
control_finish (tmp->container, tmp);
return tmp->container;
}
static void magic_lac_tunnel (void *data)
{
struct lac *lac;
lac = (struct lac *) data;
if (!lac)
{
l2tp_log (LOG_WARNING, "%s: magic_lac_tunnel: called on NULL lac!\n",
__FUNCTION__);
return;
}
if (lac->lns)
{
/* FIXME: I should try different LNS's if I get failures */
l2tp_call (lac->lns->hostname, lac->lns->port, lac, NULL);
}
else if (deflac && deflac->lns)
{
l2tp_call (deflac->lns->hostname, deflac->lns->port, lac, NULL);
}
else
{
l2tp_log (LOG_WARNING, "%s: Unable to find hostname to dial for '%s'\n",
__FUNCTION__, lac->entname);
}
}
static struct call *lac_call (int tid, struct lac *lac, struct lns *lns)
{
struct tunnel *t = tunnels.head;
struct call *tmp;
while (t)
{
if (t->ourtid == tid)
{
tmp = new_call (t);
if (!tmp)
{
l2tp_log (LOG_WARNING, "%s: unable to create new call\n",
__FUNCTION__);
return NULL;
}
tmp->next = t->call_head;
t->call_head = tmp;
t->count++;
tmp->cid = 0;
tmp->lac = lac;
tmp->lns = lns;
if (lac)
lac->c = tmp;
l2tp_log (LOG_NOTICE, "Calling on tunnel %d\n", tid);
strcpy (tmp->dial_no, dial_no_tmp); /* jz: copy dialnumber to tmp->dial_no */
control_finish (t, tmp);
return tmp;
}
t = t->next;
};
l2tp_log (LOG_DEBUG, "%s: No such tunnel %d to generate call.\n", __FUNCTION__,
tid);
return NULL;
}
void magic_lac_dial (void *data)
{
struct lac *lac;
lac = (struct lac *) data;
if (!lac)
{
l2tp_log (LOG_WARNING, "%s : called on NULL lac!\n", __FUNCTION__);
return;
}
if (!lac->active)
{
l2tp_log (LOG_DEBUG, "%s: LAC %s not active", __FUNCTION__, lac->entname);
return;
}
lac->rsched = NULL;
lac->rtries++;
if (lac->rmax && (lac->rtries > lac->rmax))
{
l2tp_log (LOG_INFO, "%s: maximum retries exceeded.\n", __FUNCTION__);
return;
}
if (!lac->t)
{
#ifdef DEGUG_MAGIC
l2tp_log (LOG_DEBUG, "%s : tunnel not up! Connecting!\n", __FUNCTION__);
#endif
magic_lac_tunnel (lac);
return;
}
lac_call (lac->t->ourtid, lac, NULL);
}
static void lac_hangup (int cid)
{
struct tunnel *t = tunnels.head;
struct call *tmp;
while (t)
{
tmp = t->call_head;
while (tmp)
{
if (tmp->ourcid == cid)
{
l2tp_log (LOG_INFO,
"%s :Hanging up call %d, Local: %d, Remote: %d\n",
__FUNCTION__, tmp->serno, tmp->ourcid, tmp->cid);
strcpy (tmp->errormsg, "Goodbye!");
/* tmp->needclose = -1; */
kill (tmp->pppd, SIGTERM);
return;
}
tmp = tmp->next;
}
t = t->next;
};
l2tp_log (LOG_DEBUG, "%s : No such call %d to hang up.\n", __FUNCTION__, cid);
return;
}
static void lac_disconnect (int tid)
{
struct tunnel *t = tunnels.head;
while (t)
{
if (t->ourtid == tid)
{
l2tp_log (LOG_INFO,
"Disconnecting from %s, Local: %d, Remote: %d\n",
IPADDY (t->peer.sin_addr), t->ourtid, t->tid);
t->self->needclose = -1;
strcpy (t->self->errormsg, "Goodbye!");
call_close (t->self);
return;
}
t = t->next;
};
l2tp_log (LOG_DEBUG, "No such tunnel %d to hang up.\n", tid);
return;
}
struct tunnel *new_tunnel ()
{
struct tunnel *tmp = calloc (1, sizeof (struct tunnel));
unsigned char entropy_buf[2] = "\0";
if (!tmp)
return NULL;
tmp->debug = -1;
tmp->tid = -1;
#ifndef TESTING
/* while(get_call((tmp->ourtid = rand() & 0xFFFF),0,0,0)); */
/* tmp->ourtid = rand () & 0xFFFF; */
/* get_entropy((char *)&tmp->ourtid, 2); */
get_entropy(entropy_buf, 2);
{
unsigned short *temp;
temp = (unsigned short *)entropy_buf;
tmp->ourtid = *temp & 0xFFFF;
#ifdef DEBUG_ENTROPY
l2tp_log(LOG_DEBUG, "ourtid = %u, entropy_buf = %hx\n", tmp->ourtid, *temp);
#endif
}
#else
tmp->ourtid = 0x6227;
#endif
tmp->peer.sin_family = AF_INET;
bzero (&(tmp->peer.sin_addr), sizeof (tmp->peer.sin_addr));
#ifdef SANITY
tmp->sanity = -1;
#endif
tmp->qtid = -1;
tmp->ourfc = ASYNC_FRAMING | SYNC_FRAMING;
tmp->ourtb = (((_u64) rand ()) << 32) | ((_u64) rand ());
tmp->fc = -1; /* These really need to be specified by the peer */
tmp->bc = -1; /* And we want to know if they forgot */
if (!(tmp->self = new_call (tmp)))
{
free (tmp);
return NULL;
};
tmp->ourrws = DEFAULT_RWS_SIZE;
tmp->self->ourfbit = FBIT;
tmp->rxspeed = DEFAULT_RX_BPS;
tmp->txspeed = DEFAULT_TX_BPS;
memset (tmp->chal_us.reply, 0, MD_SIG_SIZE);
memset (tmp->chal_them.reply, 0, MD_SIG_SIZE);
tmp->chal_them.vector = malloc (VECTOR_SIZE);
return tmp;
}
static void write_res (FILE* res_file, const char *fmt, ...)
{
if (!res_file || ferror (res_file) || feof (res_file))
return;
va_list args;
va_start (args, fmt);
vfprintf (res_file, fmt, args);
va_end (args);
}
static int parse_one_line (char* bufp, int context, void* tc)
{
/* FIXME: I should check for incompatible options */
char *s, *d, *t;
int linenum = 0;
s = strtok (bufp, ";");
// parse options token by token
while (s != NULL)
{
linenum++;
while ((*s < 33) && *s)
s++; /* Skip over beginning white space */
t = s + strlen (s);
while ((t >= s) && (*t < 33))
*(t--) = 0; /* Ditch trailing white space */
if (!strlen (s))
continue;
if (!(t = strchr (s, '=')))
{
l2tp_log (LOG_WARNING, "%s: token %d: no '=' in data\n",
__FUNCTION__, linenum);
return -1;
}
d = t;
d--;
t++;
while ((d >= s) && (*d < 33))
d--;
d++;
*d = 0;
while (*t && (*t < 33))
t++;
#ifdef DEBUG_CONTROL
l2tp_log (LOG_DEBUG, "%s: field is %s, value is %s\n",
__FUNCTION__, s, t);
#endif
/* Okay, bit twidling is done. Let's handle this */
switch (parse_one_option (s, t, context, tc))
{
case -1:
l2tp_log (LOG_WARNING, "%s: error token %d\n",
__FUNCTION__, linenum);
return -1;
case -2:
l2tp_log (LOG_CRIT, "%s: token %d: Unknown field '%s'\n",
__FUNCTION__, linenum, s);
return -1;
}