/*
* pptpctrl.c
*
* PPTP control connection between PAC-PNS pair
*
* $Id: pptpctrl.c,v 1.20 2006/12/08 00:01:40 quozl Exp $
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef __linux__
#define _GNU_SOURCE 1 /* kill() prototype, broken arpa/inet.h */
#endif
#include "our_syslog.h"
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef HAVE_OPENPTY
#ifdef HAVE_PTY_H
#include <pty.h>
#include <termios.h>
#endif
#ifdef HAVE_LIBUTIL_H
#include <libutil.h>
#endif
#endif
#ifdef __UCLIBC__
#define socklen_t int
#endif
#include "compat.h"
#include "pptpctrl.h"
#include "pptpgre.h"
#include "pptpdefs.h"
#include "ctrlpacket.h"
#include "defaults.h"
// placing net/if.h here fixes build on Solaris
#include <net/if.h>
static char *ppp_binary = PPP_BINARY;
static int pptp_logwtmp;
static int noipparam; /* if true, don't send ipparam to ppp */
static char speed[32];
static char pppdxfig[256];
static pid_t pppfork; /* so we can kill it after disconnect */
/*
* Global to handle dying
*
* I'd be nice if someone could figure out a way to do it
* without the global, but i don't think you can.. -tmk
*/
#define clientSocket 0 /* in case it changes back to a variable */
static u_int32_t call_id_pair; /* call id (to terminate call) */
/* Needed by this and ctrlpacket.c */
int pptpctrl_debug = 0; /* specifies if debugging is on or off */
uint16_t unique_call_id = 0xFFFF; /* Start value for our call IDs on this TCP link */
int gargc; /* Command line argument count */
char **gargv; /* Command line argument vector */
/* Local function prototypes */
static void bail(int sigraised);
static void pptp_handle_ctrl_connection(char **pppaddrs, struct in_addr *inetaddrs);
static int startCall(char **pppaddrs, struct in_addr *inetaddrs);
static void launch_pppd(char **pppaddrs, struct in_addr *inetaddrs);
/* Oh the horror.. lets hope this covers all the ones we have to handle */
#if defined(O_NONBLOCK) && !defined(__sun__) && !defined(__sun)
#define OUR_NB_MODE O_NONBLOCK
#else
#define OUR_NB_MODE O_NDELAY
#endif
/* read a command line argument, a flag alone */
#define GETARG_INT(X) \
X = atoi(argv[arg++])
/* read a command line argument, a string alone */
#define GETARG_STRING(X) \
X = strdup(argv[arg++])
/* read a command line argument, a presence flag followed by string */
#define GETARG_VALUE(X) \
if(atoi(argv[arg++]) != 0) \
strlcpy(X, argv[arg++], sizeof(X)); \
else \
*X = '\0'
int main(int argc, char **argv)
{
char pppLocal[16]; /* local IP to pass to pppd */
char pppRemote[16]; /* remote IP address to pass to pppd */
struct sockaddr_in addr; /* client address */
socklen_t addrlen;
int arg = 1;
int flags;
struct in_addr inetaddrs[2];
char *pppaddrs[2] = { pppLocal, pppRemote };
gargc = argc;
gargv = argv;
/* fail if argument count invalid */
if (argc < 7) {
fprintf(stderr, "pptpctrl: insufficient arguments, see man pptpctrl\n");
exit(2);
}
/* open a connection to the syslog daemon */
openlog("pptpd", LOG_PID, PPTP_FACILITY);
/* autoreap if supported */
signal(SIGCHLD, SIG_IGN);
/* note: update pptpctrl.8 if the argument list format is changed */
GETARG_INT(pptpctrl_debug);
GETARG_INT(noipparam);
GETARG_VALUE(pppdxfig);
GETARG_VALUE(speed);
GETARG_VALUE(pppLocal);
GETARG_VALUE(pppRemote);
if (arg < argc) GETARG_INT(unique_call_id);
if (arg < argc) GETARG_STRING(ppp_binary);
if (arg < argc) GETARG_INT(pptp_logwtmp);
if (pptpctrl_debug) {
if (*pppLocal)
syslog(LOG_DEBUG, "CTRL: local address = %s", pppLocal);
if (*pppRemote)
syslog(LOG_DEBUG, "CTRL: remote address = %s", pppRemote);
if (*speed)
syslog(LOG_DEBUG, "CTRL: pppd speed = %s", speed);
#if BSDUSER_PPP
if (*pppdxfig)
syslog(LOG_DEBUG, "CTRL: BSD userland ppp system label = %s", pppdxfig);
#else
if (*pppdxfig)
syslog(LOG_DEBUG, "CTRL: pppd options file = %s", pppdxfig);
#endif
}
addrlen = sizeof(addr);
if (getsockname(clientSocket, (struct sockaddr *) &addr, &addrlen) != 0) {
syslog(LOG_ERR, "CTRL: getsockname() failed");
syslog_perror("getsockname");
close(clientSocket);
bail(0); /* NORETURN */
}
inetaddrs[0] = addr.sin_addr;
addrlen = sizeof(addr);
if (getpeername(clientSocket, (struct sockaddr *) &addr, &addrlen) != 0) {
syslog(LOG_ERR, "CTRL: getpeername() failed");
syslog_perror("getpeername");
close(clientSocket);
bail(0); /* NORETURN */
}
inetaddrs[1] = addr.sin_addr;
/* Set non-blocking */
if ((flags = fcntl(clientSocket, F_GETFL, arg /* ignored */)) == -1 ||
fcntl(clientSocket, F_SETFL, flags|OUR_NB_MODE) == -1) {
syslog(LOG_ERR, "CTRL: Failed to set client socket non-blocking");
syslog_perror("fcntl");
close(clientSocket);
bail(0); /* NORETURN */
}
/* Fiddle with argv */
my_setproctitle(gargc, gargv, "pptpd [%s]%20c",
inet_ntoa(addr.sin_addr), ' ');
/* be ready for a grisly death */
sigpipe_create();
sigpipe_assign(SIGTERM);
NOTE_VALUE(PAC, call_id_pair, htons(-1));
NOTE_VALUE(PNS, call_id_pair, htons(-1));
syslog(LOG_INFO, "CTRL: Client %s control connection started", inet_ntoa(addr.sin_addr));
pptp_handle_ctrl_connection(pppaddrs, inetaddrs);
syslog(LOG_DEBUG, "CTRL: Reaping child PPP[%i]", pppfork);
if (pppfork > 0)
waitpid(pppfork, NULL, 0);
syslog(LOG_INFO, "CTRL: Client %s control connection finished", inet_ntoa(addr.sin_addr));
bail(0); /* NORETURN */
return 1; /* make gcc happy */
}
/*
* Local functions only below
*/
/*
* pptp_handle_ctrl_connection
*
* 1. read a packet (should be start_ctrl_conn_rqst)
* 2. reply to packet (send a start_ctrl_conn_rply)
* 3. proceed with GRE and CTRL connections
*
* args: pppaddrs - ppp local and remote addresses (strings)
* inetaddrs - local and client socket address
* retn: 0 success, -1 failure
*/
static void pptp_handle_ctrl_connection(char **pppaddrs, struct in_addr *inetaddrs)
{
/* For echo requests used to check link is alive */
int echo_wait = FALSE; /* Waiting for echo? */
u_int32_t echo_count = 0; /* Sequence # of echo */
time_t echo_time = 0; /* Time last echo req sent */
struct timeval idleTime; /* How long to select() */
/* General local variables */
ssize_t rply_size; /* Reply packet size */
fd_set fds; /* For select() */
int maxfd = clientSocket; /* For select() */
int send_packet; /* Send a packet this time? */
#if BSDUSER_PPP || SLIRP
/* not needed by stuff which uses socketpair() in startCall() */
#define init 1
#else
int init = 0; /* Has pppd initialized the pty? */
#endif
int pty_fd = -1; /* File descriptor of pty */
int gre_fd = -1; /* Network file descriptor */
int sig_fd = sigpipe_fd(); /* Signal pipe descriptor */
unsigned char packet[PPTP_MAX_CTRL_PCKT_SIZE];
unsigned char rply_packet[PPTP_MAX_CTRL_PCKT_SIZE];
for (;;) {
FD_ZERO(&fds);
FD_SET(sig_fd, &fds);
FD_SET(clientSocket, &fds);
if (pty_fd != -1)
FD_SET(pty_fd, &fds);
if (gre_fd != -1 && init)
FD_SET(gre_fd, &fds);
/* set timeout */
if (encaps_gre(-1, NULL, 0) || decaps_hdlc(-1, NULL, 0)) {
idleTime.tv_sec = 0;
idleTime.tv_usec = 50000; /* don't ack immediately */
} else {
idleTime.tv_sec = IDLE_WAIT;
idleTime.tv_usec = 0;
}
/* default: do nothing */
send_packet = FALSE;
switch (select(maxfd + 1, &fds, NULL, NULL, &idleTime)) {
case -1: /* Error with select() */
if (errno != EINTR)
syslog(LOG_ERR, "CTRL: Error with select(), quitting");
goto leave_clear_call;
case 0:
if (decaps_hdlc(-1, NULL, 0)) {
if(decaps_hdlc(-1, encaps_gre, gre_fd))
syslog(LOG_ERR, "CTRL: GRE re-xmit failed");
} else if (encaps_gre(-1, NULL, 0))
/* Pending ack and nothing else to do */
encaps_gre(gre_fd, NULL, 0); /* send ack with no payload */
else if (echo_wait != TRUE) {
/* Timeout. Start idle link detection. */
echo_count++;
if (pptpctrl_debug)
syslog(LOG_DEBUG, "CTRL: Sending ECHO REQ id %d", echo_count);
time(&echo_time);
make_echo_req_packet(rply_packet, &rply_size, echo_count);
echo_wait = TRUE;
send_packet = TRUE;
}
break;
default:
break;
}
/* check for pending SIGTERM delivery */
if (FD_ISSET(sig_fd, &fds)) {
if (sigpipe_read() == SIGTERM)
bail(SIGTERM);
}
/* detect startup of pppd */
#ifndef init
if (!init && pty_fd != -1 && FD_ISSET(pty_fd, &fds))
init = 1;
#endif
/* handle actual packets */
/* send from pty off via GRE */
if (pty_fd != -1 && FD_ISSET(pty_fd, &fds) && decaps_hdlc(pty_fd, encaps_gre, gre_fd) < 0) {
syslog(LOG_ERR, "CTRL: PTY read or GRE write failed (pty,gre)=(%d,%d)", pty_fd, gre_fd);
break;
}
/* send from GRE off to pty */
if (gre_fd != -1 && FD_ISSET(gre_fd, &fds) && decaps_gre(gre_fd, encaps_hdlc, pty_fd) < 0) {
if (gre_fd == 6 && pty_fd == 5) {
syslog(LOG_ERR, "CTRL: GRE-tunnel has collapsed (GRE read or PTY write failed (gre,pty)=(%d,%d))", gre_fd, pty_fd);
} else {
syslog(LOG_ERR, "CTRL: GRE read or PTY write failed (gre,pty)=(%d,%d)", gre_fd, pty_fd);
}
break;
}
/* handle control messages */
if (FD_ISSET(clientSocket, &fds)) {
send_packet = TRUE;
switch (read_pptp_packet(clientSocket, packet, rply_packet, &rply_size)) {
case 0:
syslog(LOG_ERR, "CTRL: CTRL read failed");
goto leave_drop_call;
case -1:
send_packet = FALSE;
break;
case STOP_CTRL_CONN_RQST:
if (pptpctrl_debug)
syslog(LOG_DEBUG, "CTRL: Received STOP CTRL CONN request (disconnecting)");
if (gre_fd != -1 || pty_fd != -1)
syslog(LOG_WARNING, "CTRL: Request to close control connection when call is open, closing");
send_pptp_packet(clientSocket, rply_packet, rply_size);
goto leave_drop_call;
case CALL_CLR_RQST:
if(pptpctrl_debug)
syslog(LOG_DEBUG, "CTRL: Received CALL CLR request (closing call)");
if (gre_fd == -1 || pty_fd == -1)
syslog(LOG_WARNING, "CTRL: Request to close call but call not open");
if (gre_fd != -1) {
FD_CLR(gre_fd, &fds);
close(gre_fd);
gre_fd = -1;
}
if (pty_fd != -1) {
FD_CLR(pty_fd, &fds);
close(pty_fd);
pty_fd = -1;
}
/* violating RFC */
goto leave_drop_call;
case OUT_CALL_RQST:
/* for killing off the link later (ugly) */
NOTE_VALUE(PAC, call_id_pair, ((struct pptp_out_call_rply *) (rply_packet))->call_id);
NOTE_VALUE(PNS, call_id_pair, ((struct pptp_out_call_rply *) (rply_packet))->call_id_peer);
if (gre_fd != -1 || pty_fd != -1) {
syslog(LOG_WARNING, "CTRL: Request to open call when call is already open, closing");
if (gre_fd != -1) {
FD_CLR(gre_fd, &fds);
close(gre_fd);
gre_fd = -1;
}
if (pty_fd != -1) {
FD_CLR(pty_fd, &fds);
close(pty_fd);
pty_fd = -1;
}
}
/* change process title for accounting and status scripts */
my_setproctitle(gargc, gargv,
"pptpd [%s:%04X - %04X]",
inet_ntoa(inetaddrs[1]),
ntohs(((struct pptp_out_call_rply *) (rply_packet))->call_id_peer),
ntohs(((struct pptp_out_call_rply *) (rply_packet))->call_id));
/* start the call, by launching pppd */
syslog(LOG_INFO, "CTRL: Starting call (launching pppd, opening GRE)");
pty_fd = startCall(pppaddrs, inetaddrs);
if (pty_fd > maxfd) maxfd = pty_fd;
if ((gre_fd = pptp_gre_init(call_id_pair, pty_fd, inetaddrs)) > maxfd)
maxfd = gre_fd;
break;
case ECHO_RPLY:
if (echo_wait == TRUE && ((struct pptp_echo_rply *) (packet))->identifier == echo_count)
echo_wait = FALSE;
else
syslog(LOG_WARNING, "CTRL: Unexpected ECHO REPLY packet");
/* FALLTHRU */
case SET_LINK_INFO:
send_packet = FALSE;
break;
#ifdef PNS_MODE
case IN_CALL_RQST:
case IN_CALL_RPLY:
case IN_CALL_CONN:
#endif
case CALL_DISCONN_NTFY:
case STOP_CTRL_CONN_RPLY:
/* These don't generate replies. Also they come from things we don't send in this section. */
syslog(LOG_WARNING, "CTRL: Got a reply to a packet we didn't send");
send_packet = FALSE;
break;
/* Otherwise, the already-formed reply will do fine, so send it */
}
}
/* send reply packet - this may block, but it should be very rare */
if (send_packet == TRUE && send_pptp_packet(clientSocket, rply_packet, rply_size) < 0) {
syslog(LOG_ERR, "CTRL: Error sending GRE, aborting call");
goto leave_clear_call;
}
/* waiting for echo reply and curtime - echo_time > max wait */
if (echo_wait == TRUE && (time(NULL) - echo_time) > MAX_ECHO_WAIT) {
syslog(LOG_INFO, "CTRL: Session timed out, ending call");
goto leave_clear_call;
}
}
/* Finished! :-) */
leave_drop_call:
NOTE_VALUE(PAC, call_id_pair, htons(-1));
NOTE_VALUE(PNS, call_id_pair, htons(-1));
close(clientSocket);
leave_clear_call:
/* leave clientSocket and call_id_pair alone for bail() */
if (gre_fd != -1)
close(gre_fd);
gre_fd = -1;
if (pty_fd != -1)
close(pty_fd);
pty_fd = -1;
return;
#ifdef init
#undef init
#endif
}
/*
* This is the custom exit() for this program.
*
* Updated to also be the default SIGTERM handler, and if
* the link is going down for unnatural reasons, we will close it
* right now, it's only been tested for win98, other tests would be nice
* -tmk
*/
static void bail(int sigraised)
{
if (sigraised)
syslog(LOG_INFO, "CTRL: Exiting on signal %d", sigraised);
/* send a disconnect to the other end */
/* ignore any errors */
if (GET_VALUE(PAC, call_id_pair) != htons(-1)) {
fd_set connSet; /* fd_set for select() */
struct timeval tv; /* time to wait for reply */
unsigned char packet[PPTP_MAX_CTRL_PCKT_SIZE];
unsigned char rply_packet[PPTP_MAX_CTRL_PCKT_SIZE];
ssize_t rply_size; /* reply packet size */
int pkt;
int retry = 0;
if (pptpctrl_debug)
syslog(LOG_DEBUG, "CTRL: Exiting with active call");
make_call_admin_shutdown(rply_packet, &rply_size);
if(send_pptp_packet(clientSocket, rply_packet, rply_size) < 0)
goto skip;
make_stop_ctrl_req(rply_packet, &rply_size);
if(send_pptp_packet(clientSocket, rply_packet, rply_size) < 0)
goto skip;
FD_ZERO(&connSet);
FD_SET(clientSocket, &connSet);
tv.tv_sec = 5; /* wait 5 secs for a reply then quit */
tv.tv_usec = 0;
/* Wait for STOP CTRL CONN RQST or RPLY */
while (select(clientSocket + 1, &connSet, NULL, NULL, &tv) == 1) {
switch((pkt = read_pptp_packet(clientSocket, packet, rply_packet, &rply_size))) {
case STOP_CTRL_CONN_RQST:
send_pptp_packet(clientSocket, rply_packet, rply_size);
goto skip;
case CALL_CLR_RQST:
syslog(LOG_WARNING, "CTRL: Got call clear request after call manually shutdown - buggy client");
break;
case STOP_CTRL_CONN_RPLY:
goto skip;
case -1:
syslog(LOG_WARNING, "CTRL: Retryable error in disconnect sequence");
retry++;
break;
case 0:
syslog(LOG_WARNING, "CTRL: Fatal error reading control message in disconnect sequence");
goto skip;
default:
syslog(LOG_WARNING, "CTRL: Unexpected control message %d in disconnect sequence", pkt);
retry++;
break;
}
tv.tv_sec = 5; /* wait 5 secs for another reply then quit */
tv.tv_usec = 0;
if (retry > 100) {
syslog(LOG_WARNING, "CTRL: Too many retries (%d) - giving up", retry);
break;
}
}
skip:
close(clientSocket);
}
if (pptpctrl_debug)
syslog(LOG_DEBUG, "CTRL: Exiting now");
}
/*
* startCall
*
* Launches PPPD for the call.
*
* args: pppaddrs - local/remote IPs or "" for either/both if none
* retn: pty file descriptor
*
*/
static int startCall(char **pppaddrs, struct in_addr *inetaddrs)
{
/* PTY/TTY pair for talking to PPPd */
int pty_fd, tty_fd;
/* register pids of children */
#if BSDUSER_PPP || SLIRP
int sockfd[2];
#ifndef AF_LOCAL
#ifdef AF_UNIX
#define AF_LOCAL AF_UNIX /* Old BSD */
#else
#define AF_LOCAL AF_FILE /* POSIX */
#endif
#endif
/* userspace ppp doesn't need to waste a real pty/tty pair */
if (socketpair(AF_LOCAL, SOCK_STREAM, 0, sockfd)) {
syslog(LOG_ERR, "CTRL: socketpair() error");
syslog_perror("socketpair");
exit(1);
}
tty_fd = sockfd[0];
pty_fd = sockfd[1];
#else
/* Finds an open pty/tty pair */
if (openpty(&pty_fd, &tty_fd, NULL, NULL, NULL) != 0) {
syslog(LOG_ERR, "CTRL: openpty() error");
syslog_perror("openpty");
exit(1);
} else {
struct termios tios;
/* Turn off echo in the slave - to prevent loopback.
pppd will do this, but might not do it before we
try to send data. */
if (tcgetattr(tty_fd, &tios) < 0) {
syslog(LOG_ERR, "CTRL: tcgetattr() error");
syslog_perror("tcgetattr");
exit(1);
}
tios.c_lflag &= ~(ECHO | ECHONL);
if (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0) {
syslog(LOG_ERR, "CTRL: tcsetattr() error");
syslog_perror("tcsetattr");
exit(1);
}
}
#endif
if (pptpctrl_debug) {
syslog(LOG_DEBUG, "CTRL: pty_fd = %d", pty_fd);
syslog(LOG_DEBUG, "CTRL: tty_fd = %d", tty_fd);
}
/* Launch the PPPD */
#ifndef HAVE_FORK
switch(pppfork=vfork()){
#else
switch(pppfork=fork()){
#endif
case -1: /* fork() error */
syslog(LOG_ERR, "CTRL: Error forking to exec pppd");
_exit(1);
case 0: /* child */
if (dup2(tty_fd, 0) == -1) {
syslog(LOG_ERR, "CTRL: child tty_fd dup2 to stdin, %s",
strerror(errno));
exit(1);
}
if (dup2(tty_fd, 1) == -1) {
syslog(LOG_ERR, "CTRL: child tty_fd dup2 to stdout, %s",
strerror(errno));
exit(1);
}
#if 0
/* This must never be used if !HAVE_SYSLOG since that logs to stderr.
* Trying just never using it to see if it causes anyone else problems.
* It may let people see the pppd errors, which would be good.
*/
dup2(tty_fd, 2);
#endif
if (tty_fd > 1)
close(tty_fd);
if (pty_fd > 1)
close(pty_fd);
/* In case we move clientSocket back off stdin */
#ifndef clientSocket
if (clientSocket > 1)
close(clientSocket);
#elif clientSocket > 1
close(clientSocket);
#endif
launch_pppd(pppaddrs, inetaddrs);
syslog(LOG_ERR, "CTRL: PPPD launch failed! (launch_pppd did not fork)");
_exit(1);
}
close(tty_fd);
return pty_fd;
}
/*
* launch_pppd
*
* Launches the PPP daemon. The PPP daemon is responsible for assigning the
* PPTP client its IP address.. These values are assigned via the command
* line.
*
* Add return of connected ppp interface
*
* retn: 0 on success, -1 on failure.
*
*/
static void launch_pppd(char **pppaddrs, struct in_addr *inetaddrs)
{
char *pppd_argv[14];
int an = 0;
sigset_t sigs;
pppd_argv[an++] = ppp_binary;
if (pptpctrl_debug) {
syslog(LOG_DEBUG,
"CTRL (PPPD Launcher): program binary = %s",
pppd_argv[an - 1]);
}
#if BSDUSER_PPP
/* The way that Brian Somers' user-land ppp works is to use the
* system name as a reference for most of the useful options. Hence
* most things can't be defined on the command line. On OpenBSD at
* least the file used for the systems is /etc/ppp/ppp.conf, where
* the pptp stanza should look something like:
pptp:
set speed sync
enable pap
enable chap
set dns a.a.a.a b.b.b.b
set ndbs x.x.x.x y.y.y.y
accept dns
add 10.0.0/24
* To be honest, at the time of writing, I haven't had the thing
* working enough to understand :) I will update this comment and
* make a sample config available when I get there.
*/
/* options for BSDUSER_PPP
*
* Ignore IP addresses and line speed
* Use -o or --option string as PPP system label
* Usage info in pptpd.c and configure script have been updated to
* reflect this change
*
* IP addresses can be specified in /etc/ppp/ppp.secret per user
*/
pppd_argv[an++] = "-direct";
if (*pppdxfig) {
pppd_argv[an++] = pppdxfig;
} else {
pppd_argv[an++] = "pptp"; /* XXX this is the system label */
}
#elif SLIRP
/* options for SLIRP
*
* ignores IP addresses from config - SLIRP handles this
*/
pppd_argv[an++] = "-P";
pppd_argv[an++] = "+chap";
pppd_argv[an++] = "-b";
/* If a speed has been specified, use it
* if not, use "smart" default (defaults.h)
*/
if (*speed) {
pppd_argv[an++] = speed;
} else {
pppd_argv[an++] = PPP_SPEED_DEFAULT;
}
if (*pppdxfig) {
pppd_argv[an++] = "-f";
pppd_argv[an++] = pppdxfig;
}
if (pptpctrl_debug) {
syslog(LOG_DEBUG, "CTRL (PPPD Launcher): Connection speed = %s", pppd_argv[an - 1]);
}
#else
/* options for 'normal' pppd */
pppd_argv[an++] = "local";
/* If a pppd option file is specified, use it
* if not, pppd will default to /etc/ppp/options
*/
if (*pppdxfig) {
pppd_argv[an++] = "file";
pppd_argv[an++] = pppdxfig;
}
/* If a speed has been specified, use it
* if not, use "smart" default (defaults.h)
*/
if (*speed) {
pppd_argv[an++] = speed;
} else {
pppd_argv[an++] = PPP_SPEED_DEFAULT;
}
if (pptpctrl_debug) {
if (*pppaddrs[0])
syslog(LOG_DEBUG, "CTRL (PPPD Launcher): local address = %s", pppaddrs[0]);
if (*pppaddrs[1])
syslog(LOG_DEBUG, "CTRL (PPPD Launcher): remote address = %s", pppaddrs[1]);
}
if (*pppaddrs[0] || *pppaddrs[1]) {
char pppInterfaceIPs[33];
sprintf(pppInterfaceIPs, "%s:%s", pppaddrs[0], pppaddrs[1]);
pppd_argv[an++] = pppInterfaceIPs;
}
if (!noipparam) {
pppd_argv[an++] = "ipparam";
pppd_argv[an++] = inet_ntoa(inetaddrs[1]);
}
if (pptp_logwtmp) {
pppd_argv[an++] = "plugin";
pppd_argv[an++] = "/usr/local/lib/pptpd/pptpd-logwtmp.so";
pppd_argv[an++] = "pptpd-original-ip";
pppd_argv[an++] = inet_ntoa(inetaddrs[1]);
}
#endif
/* argv arrays must always be NULL terminated */
pppd_argv[an++] = NULL;
/* make sure SIGCHLD is unblocked, pppd does not expect it */
sigfillset(&sigs);
sigprocmask(SIG_UNBLOCK, &sigs, NULL);
/* run pppd now */
execvp(pppd_argv[0], pppd_argv);
/* execvp() failed */
syslog(LOG_ERR,
"CTRL (PPPD Launcher): Failed to launch PPP daemon. %s",
strerror(errno));
}
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