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ppp/pppd/main.c

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/*
* main.c - Point-to-Point Protocol main module
*
* Copyright (c) 1989 Carnegie Mellon University.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by Carnegie Mellon University. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#define RCSID "$Id: main.c,v 1.89 2000/01/18 19:49:52 masputra Exp $"
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <syslog.h>
#include <netdb.h>
#include <utmp.h>
#include <pwd.h>
#include <setjmp.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "pppd.h"
#include "magic.h"
#include "fsm.h"
#include "lcp.h"
#include "ipcp.h"
#ifdef INET6
#include "ipv6cp.h"
#endif
#include "upap.h"
#include "chap.h"
#include "ccp.h"
#include "pathnames.h"
#include "patchlevel.h"
#ifdef CBCP_SUPPORT
#include "cbcp.h"
#endif
#ifdef IPX_CHANGE
#include "ipxcp.h"
#endif /* IPX_CHANGE */
#ifdef AT_CHANGE
#include "atcp.h"
#endif
static const char rcsid[] = RCSID;
/* interface vars */
char ifname[32]; /* Interface name */
int ifunit; /* Interface unit number */
char *progname; /* Name of this program */
char hostname[MAXNAMELEN]; /* Our hostname */
static char pidfilename[MAXPATHLEN]; /* name of pid file */
static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
static char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
static uid_t uid; /* Our real user-id */
static int conn_running; /* we have a [dis]connector running */
int ttyfd; /* Serial port file descriptor */
mode_t tty_mode = -1; /* Original access permissions to tty */
int baud_rate; /* Actual bits/second for serial device */
int hungup; /* terminal has been hung up */
int privileged; /* we're running as real uid root */
int need_holdoff; /* need holdoff period before restarting */
int detached; /* have detached from terminal */
struct stat devstat; /* result of stat() on devnam */
int prepass = 0; /* doing prepass to find device name */
int devnam_fixed; /* set while in options.ttyxx file */
volatile int status; /* exit status for pppd */
int unsuccess; /* # unsuccessful connection attempts */
int do_callback; /* != 0 if we should do callback next */
int doing_callback; /* != 0 if we are doing callback */
char *callback_script; /* script for doing callback */
int (*holdoff_hook) __P((void)) = NULL;
int (*new_phase_hook) __P((int)) = NULL;
static int fd_ppp = -1; /* fd for talking PPP */
static int fd_loop; /* fd for getting demand-dial packets */
static int pty_master; /* fd for master side of pty */
static int pty_slave; /* fd for slave side of pty */
static int real_ttyfd; /* fd for actual serial port (not pty) */
int phase; /* where the link is at */
int kill_link;
int open_ccp_flag;
static int waiting;
static sigjmp_buf sigjmp;
char **script_env; /* Env. variable values for scripts */
int s_env_nalloc; /* # words avail at script_env */
u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
static int n_children; /* # child processes still running */
static int got_sigchld; /* set if we have received a SIGCHLD */
static int locked; /* lock() has succeeded */
static int privopen; /* don't lock, open device as root */
char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
int ngroups; /* How many groups valid in groups */
static struct timeval start_time; /* Time when link was started. */
struct pppd_stats link_stats;
int link_connect_time;
int link_stats_valid;
static int charshunt_pid; /* Process ID for charshunt */
/*
* We maintain a list of child process pids and
* functions to call when they exit.
*/
struct subprocess {
pid_t pid;
char *prog;
void (*done) __P((void *));
void *arg;
struct subprocess *next;
};
static struct subprocess *children;
/* Prototypes for procedures local to this file. */
static void create_pidfile __P((void));
static void create_linkpidfile __P((void));
static void cleanup __P((void));
static void close_tty __P((void));
static void get_input __P((void));
static void calltimeout __P((void));
static struct timeval *timeleft __P((struct timeval *));
static void kill_my_pg __P((int));
static void hup __P((int));
static void term __P((int));
static void chld __P((int));
static void toggle_debug __P((int));
static void open_ccp __P((int));
static void bad_signal __P((int));
static void holdoff_end __P((void *));
static int device_script __P((char *, int, int, int));
static int reap_kids __P((int waitfor));
static void record_child __P((int, char *, void (*) (void *), void *));
static int start_charshunt __P((int, int));
static void charshunt_done __P((void *));
static void charshunt __P((int, int, char *));
static int record_write __P((FILE *, int code, u_char *buf, int nb,
struct timeval *));
extern char *ttyname __P((int));
extern char *getlogin __P((void));
int main __P((int, char *[]));
#ifdef ultrix
#undef O_NONBLOCK
#define O_NONBLOCK O_NDELAY
#endif
#ifdef ULTRIX
#define setlogmask(x)
#endif
/*
* PPP Data Link Layer "protocol" table.
* One entry per supported protocol.
* The last entry must be NULL.
*/
struct protent *protocols[] = {
&lcp_protent,
&pap_protent,
&chap_protent,
#ifdef CBCP_SUPPORT
&cbcp_protent,
#endif
&ipcp_protent,
#ifdef INET6
&ipv6cp_protent,
#endif
&ccp_protent,
#ifdef IPX_CHANGE
&ipxcp_protent,
#endif
#ifdef AT_CHANGE
&atcp_protent,
#endif
NULL
};
int
main(argc, argv)
int argc;
char *argv[];
{
int i, fdflags, t;
struct sigaction sa;
char *p, *connector;
struct passwd *pw;
struct timeval timo;
sigset_t mask;
struct protent *protp;
struct stat statbuf;
char numbuf[16];
new_phase(PHASE_INITIALIZE);
/*
* Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
* This way we can close 0, 1, 2 in detach() without clobbering
* a fd that we are using.
*/
if ((i = open("/dev/null", O_RDWR)) >= 0) {
while (0 <= i && i <= 2)
i = dup(i);
if (i >= 0)
close(i);
}
script_env = NULL;
/* Initialize syslog facilities */
reopen_log();
if (gethostname(hostname, MAXNAMELEN) < 0 ) {
option_error("Couldn't get hostname: %m");
exit(1);
}
hostname[MAXNAMELEN-1] = 0;
/* make sure we don't create world or group writable files. */
umask(umask(0777) | 022);
uid = getuid();
privileged = uid == 0;
slprintf(numbuf, sizeof(numbuf), "%d", uid);
script_setenv("ORIG_UID", numbuf);
ngroups = getgroups(NGROUPS_MAX, groups);
/*
* Initialize magic number generator now so that protocols may
* use magic numbers in initialization.
*/
magic_init();
/*
* Initialize to the standard option set, then parse, in order,
* the system options file, the user's options file,
* the tty's options file, and the command line arguments.
*/
for (i = 0; (protp = protocols[i]) != NULL; ++i)
(*protp->init)(0);
progname = *argv;
prepass = 0;
if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
|| !options_from_user())
exit(EXIT_OPTION_ERROR);
/* scan command line and options files to find device name */
prepass = 1;
parse_args(argc-1, argv+1);
prepass = 0;
/*
* Work out the device name, if it hasn't already been specified.
*/
using_pty = notty || ptycommand != NULL;
if (!using_pty && default_device) {
char *p;
if (!isatty(0) || (p = ttyname(0)) == NULL) {
option_error("no device specified and stdin is not a tty");
exit(EXIT_OPTION_ERROR);
}
strlcpy(devnam, p, sizeof(devnam));
if (stat(devnam, &devstat) < 0)
fatal("Couldn't stat default device %s: %m", devnam);
}
/*
* Parse the tty options file and the command line.
* The per-tty options file should not change
* ptycommand, notty or devnam.
*/
devnam_fixed = 1;
if (!using_pty) {
if (!options_for_tty())
exit(EXIT_OPTION_ERROR);
}
devnam_fixed = 0;
if (!parse_args(argc-1, argv+1))
exit(EXIT_OPTION_ERROR);
/*
* Check that we are running as root.
*/
if (geteuid() != 0) {
option_error("must be root to run %s, since it is not setuid-root",
argv[0]);
exit(EXIT_NOT_ROOT);
}
if (!ppp_available()) {
option_error(no_ppp_msg);
exit(EXIT_NO_KERNEL_SUPPORT);
}
/*
* Check that the options given are valid and consistent.
*/
if (!sys_check_options())
exit(EXIT_OPTION_ERROR);
auth_check_options();
for (i = 0; (protp = protocols[i]) != NULL; ++i)
if (protp->check_options != NULL)
(*protp->check_options)();
if (demand && connect_script == 0) {
option_error("connect script is required for demand-dialling\n");
exit(EXIT_OPTION_ERROR);
}
/* default holdoff to 0 if no connect script has been given */
if (connect_script == 0 && !holdoff_specified)
holdoff = 0;
if (using_pty) {
if (!default_device) {
option_error("%s option precludes specifying device name",
notty? "notty": "pty");
exit(EXIT_OPTION_ERROR);
}
if (ptycommand != NULL && notty) {
option_error("pty option is incompatible with notty option");
exit(EXIT_OPTION_ERROR);
}
default_device = notty;
lockflag = 0;
modem = 0;
if (notty && log_to_fd <= 1)
log_to_fd = -1;
} else {
/*
* If the user has specified a device which is the same as
* the one on stdin, pretend they didn't specify any.
* If the device is already open read/write on stdin,
* we assume we don't need to lock it, and we can open it as root.
*/
if (fstat(0, &statbuf) >= 0 && S_ISCHR(statbuf.st_mode)
&& statbuf.st_rdev == devstat.st_rdev) {
default_device = 1;
fdflags = fcntl(0, F_GETFL);
if (fdflags != -1 && (fdflags & O_ACCMODE) == O_RDWR)
privopen = 1;
}
}
if (default_device)
nodetach = 1;
/*
* Don't send log messages to the serial port, it tends to
* confuse the peer. :-)
*/
if (log_to_fd >= 0 && fstat(log_to_fd, &statbuf) >= 0
&& S_ISCHR(statbuf.st_mode) && statbuf.st_rdev == devstat.st_rdev)
log_to_fd = -1;
script_setenv("DEVICE", devnam);
/*
* Initialize system-dependent stuff.
*/
sys_init();
if (debug)
setlogmask(LOG_UPTO(LOG_DEBUG));
/*
* Detach ourselves from the terminal, if required,
* and identify who is running us.
*/
if (!nodetach && !updetach)
detach();
p = getlogin();
if (p == NULL) {
pw = getpwuid(uid);
if (pw != NULL && pw->pw_name != NULL)
p = pw->pw_name;
else
p = "(unknown)";
}
syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
script_setenv("PPPLOGNAME", p);
/*
* Compute mask of all interesting signals and install signal handlers
* for each. Only one signal handler may be active at a time. Therefore,
* all other signals should be masked when any handler is executing.
*/
sigemptyset(&mask);
sigaddset(&mask, SIGHUP);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGTERM);
sigaddset(&mask, SIGCHLD);
sigaddset(&mask, SIGUSR2);
#define SIGNAL(s, handler) do { \
sa.sa_handler = handler; \
if (sigaction(s, &sa, NULL) < 0) \
fatal("Couldn't establish signal handler (%d): %m", s); \
} while (0)
sa.sa_mask = mask;
sa.sa_flags = 0;
SIGNAL(SIGHUP, hup); /* Hangup */
SIGNAL(SIGINT, term); /* Interrupt */
SIGNAL(SIGTERM, term); /* Terminate */
SIGNAL(SIGCHLD, chld);
SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
/*
* Install a handler for other signals which would otherwise
* cause pppd to exit without cleaning up.
*/
SIGNAL(SIGABRT, bad_signal);
SIGNAL(SIGALRM, bad_signal);
SIGNAL(SIGFPE, bad_signal);
SIGNAL(SIGILL, bad_signal);
SIGNAL(SIGPIPE, bad_signal);
SIGNAL(SIGQUIT, bad_signal);
SIGNAL(SIGSEGV, bad_signal);
#ifdef SIGBUS
SIGNAL(SIGBUS, bad_signal);
#endif
#ifdef SIGEMT
SIGNAL(SIGEMT, bad_signal);
#endif
#ifdef SIGPOLL
SIGNAL(SIGPOLL, bad_signal);
#endif
#ifdef SIGPROF
SIGNAL(SIGPROF, bad_signal);
#endif
#ifdef SIGSYS
SIGNAL(SIGSYS, bad_signal);
#endif
#ifdef SIGTRAP
SIGNAL(SIGTRAP, bad_signal);
#endif
#ifdef SIGVTALRM
SIGNAL(SIGVTALRM, bad_signal);
#endif
#ifdef SIGXCPU
SIGNAL(SIGXCPU, bad_signal);
#endif
#ifdef SIGXFSZ
SIGNAL(SIGXFSZ, bad_signal);
#endif
/*
* Apparently we can get a SIGPIPE when we call syslog, if
* syslogd has died and been restarted. Ignoring it seems
* be sufficient.
*/
signal(SIGPIPE, SIG_IGN);
waiting = 0;
create_linkpidfile();
/*
* If we're doing dial-on-demand, set up the interface now.
*/
if (demand) {
/*
* Open the loopback channel and set it up to be the ppp interface.
*/
fd_loop = open_ppp_loopback();
syslog(LOG_INFO, "Using interface ppp%d", ifunit);
slprintf(ifname, sizeof(ifname), "ppp%d", ifunit);
script_setenv("IFNAME", ifname);
create_pidfile(); /* write pid to file */
/*
* Configure the interface and mark it up, etc.
*/
demand_conf();
}
do_callback = 0;
for (;;) {
need_holdoff = 1;
ttyfd = -1;
real_ttyfd = -1;
status = EXIT_OK;
++unsuccess;
doing_callback = do_callback;
do_callback = 0;
if (demand && !doing_callback) {
/*
* Don't do anything until we see some activity.
*/
kill_link = 0;
new_phase(PHASE_DORMANT);
demand_unblock();
add_fd(fd_loop);
for (;;) {
if (sigsetjmp(sigjmp, 1) == 0) {
sigprocmask(SIG_BLOCK, &mask, NULL);
if (kill_link || got_sigchld) {
sigprocmask(SIG_UNBLOCK, &mask, NULL);
} else {
waiting = 1;
sigprocmask(SIG_UNBLOCK, &mask, NULL);
wait_input(timeleft(&timo));
}
}
waiting = 0;
calltimeout();
if (kill_link) {
if (!persist)
break;
kill_link = 0;
}
if (get_loop_output())
break;
if (got_sigchld)
reap_kids(0);
}
remove_fd(fd_loop);
if (kill_link && !persist)
break;
/*
* Now we want to bring up the link.
*/
demand_block();
info("Starting link");
}
new_phase(PHASE_SERIALCONN);
/*
* Get a pty master/slave pair if the pty, notty, or record
* options were specified.
*/
strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam));
pty_master = -1;
pty_slave = -1;
if (ptycommand != NULL || notty || record_file != NULL) {
if (!get_pty(&pty_master, &pty_slave, ppp_devnam, uid)) {
error("Couldn't allocate pseudo-tty");
status = EXIT_FATAL_ERROR;
goto fail;
}
set_up_tty(pty_slave, 1);
}
/*
* Lock the device if we've been asked to.
*/
status = EXIT_LOCK_FAILED;
if (lockflag && !privopen) {
if (lock(devnam) < 0)
goto fail;
locked = 1;
}
/*
* Open the serial device and set it up to be the ppp interface.
* First we open it in non-blocking mode so we can set the
* various termios flags appropriately. If we aren't dialling
* out and we want to use the modem lines, we reopen it later
* in order to wait for the carrier detect signal from the modem.
*/
hungup = 0;
kill_link = 0;
connector = doing_callback? callback_script: connect_script;
if (devnam[0] != 0) {
for (;;) {
/* If the user specified the device name, become the
user before opening it. */
int err;
if (!devnam_info.priv && !privopen)
seteuid(uid);
ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0);
err = errno;
if (!devnam_info.priv && !privopen)
seteuid(0);
if (ttyfd >= 0)
break;
errno = err;
if (err != EINTR) {
error("Failed to open %s: %m", devnam);
status = EXIT_OPEN_FAILED;
}
if (!persist || err != EINTR)
goto fail;
}
if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
|| fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
warn("Couldn't reset non-blocking mode on device: %m");
/*
* Do the equivalent of `mesg n' to stop broadcast messages.
*/
if (fstat(ttyfd, &statbuf) < 0
|| fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
warn("Couldn't restrict write permissions to %s: %m", devnam);
} else
tty_mode = statbuf.st_mode;
/*
* Set line speed, flow control, etc.
* If we have a non-null connection or initializer script,
* on most systems we set CLOCAL for now so that we can talk
* to the modem before carrier comes up. But this has the
* side effect that we might miss it if CD drops before we
* get to clear CLOCAL below. On systems where we can talk
* successfully to the modem with CLOCAL clear and CD down,
* we could clear CLOCAL at this point.
*/
set_up_tty(ttyfd, ((connector != NULL && connector[0] != 0)
|| initializer != NULL));
real_ttyfd = ttyfd;
}
/*
* If the notty and/or record option was specified,
* start up the character shunt now.
*/
status = EXIT_PTYCMD_FAILED;
if (ptycommand != NULL) {
if (record_file != NULL) {
int ipipe[2], opipe[2], ok;
if (pipe(ipipe) < 0 || pipe(opipe) < 0)
fatal("Couldn't create pipes for record option: %m");
ok = device_script(ptycommand, opipe[0], ipipe[1], 1) == 0
&& start_charshunt(ipipe[0], opipe[1]);
close(ipipe[0]);
close(ipipe[1]);
close(opipe[0]);
close(opipe[1]);
if (!ok)
goto fail;
} else {
if (device_script(ptycommand, pty_master, pty_master, 1) < 0)
goto fail;
ttyfd = pty_slave;
close(pty_master);
pty_master = -1;
}
} else if (notty) {
if (!start_charshunt(0, 1))
goto fail;
} else if (record_file != NULL) {
if (!start_charshunt(ttyfd, ttyfd))
goto fail;
}
/* run connection script */
if ((connector && connector[0]) || initializer) {
if (real_ttyfd != -1) {
/* XXX do this if doing_callback == CALLBACK_DIALIN? */
if (!default_device && modem) {
setdtr(real_ttyfd, 0); /* in case modem is off hook */
sleep(1);
setdtr(real_ttyfd, 1);
}
}
if (initializer && initializer[0]) {
if (device_script(initializer, ttyfd, ttyfd, 0) < 0) {
error("Initializer script failed");
status = EXIT_INIT_FAILED;
goto fail;
}
if (kill_link)
goto disconnect;
info("Serial port initialized.");
}
if (connector && connector[0]) {
if (device_script(connector, ttyfd, ttyfd, 0) < 0) {
error("Connect script failed");
status = EXIT_CONNECT_FAILED;
goto fail;
}
if (kill_link)
goto disconnect;
info("Serial connection established.");
}
/* set line speed, flow control, etc.;
clear CLOCAL if modem option */
if (real_ttyfd != -1)
set_up_tty(real_ttyfd, 0);
if (doing_callback == CALLBACK_DIALIN)
connector = NULL;
}
/* reopen tty if necessary to wait for carrier */
if (connector == NULL && modem && devnam[0] != 0) {
for (;;) {
if ((i = open(devnam, O_RDWR)) >= 0)
break;
if (errno != EINTR) {
error("Failed to reopen %s: %m", devnam);
status = EXIT_OPEN_FAILED;
}
if (!persist || errno != EINTR || hungup || kill_link)
goto fail;
}
close(i);
}
slprintf(numbuf, sizeof(numbuf), "%d", baud_rate);
script_setenv("SPEED", numbuf);
/* run welcome script, if any */
if (welcomer && welcomer[0]) {
if (device_script(welcomer, ttyfd, ttyfd, 0) < 0)
warn("Welcome script failed");
}
/* set up the serial device as a ppp interface */
fd_ppp = establish_ppp(ttyfd);
if (fd_ppp < 0) {
status = EXIT_FATAL_ERROR;
goto disconnect;
}
if (!demand) {
info("Using interface ppp%d", ifunit);
slprintf(ifname, sizeof(ifname), "ppp%d", ifunit);
script_setenv("IFNAME", ifname);
create_pidfile(); /* write pid to file */
}
/*
* Start opening the connection and wait for
* incoming events (reply, timeout, etc.).
*/
notice("Connect: %s <--> %s", ifname, ppp_devnam);
gettimeofday(&start_time, NULL);
link_stats_valid = 0;
script_unsetenv("CONNECT_TIME");
script_unsetenv("BYTES_SENT");
script_unsetenv("BYTES_RCVD");
lcp_lowerup(0);
/*
* If we are initiating this connection, wait for a short
* time for something from the peer. This can avoid bouncing
* our packets off his tty before he has it set up.
*/
add_fd(fd_ppp);
if (connect_delay != 0 && (connector != NULL || ptycommand != NULL)) {
struct timeval t;
t.tv_sec = connect_delay / 1000;
t.tv_usec = connect_delay % 1000;
wait_input(&t);
}
lcp_open(0); /* Start protocol */
open_ccp_flag = 0;
status = EXIT_NEGOTIATION_FAILED;
new_phase(PHASE_ESTABLISH);
while (phase != PHASE_DEAD) {
if (sigsetjmp(sigjmp, 1) == 0) {
sigprocmask(SIG_BLOCK, &mask, NULL);
if (kill_link || open_ccp_flag || got_sigchld) {
sigprocmask(SIG_UNBLOCK, &mask, NULL);
} else {
waiting = 1;
sigprocmask(SIG_UNBLOCK, &mask, NULL);
wait_input(timeleft(&timo));
}
}
waiting = 0;
calltimeout();
get_input();
if (kill_link) {
lcp_close(0, "User request");
kill_link = 0;
}
if (open_ccp_flag) {
if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
(*ccp_protent.open)(0);
}
open_ccp_flag = 0;
}
if (got_sigchld)
reap_kids(0); /* Don't leave dead kids lying around */
}
/*
* Print connect time and statistics.
*/
if (link_stats_valid) {
int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
info("Connect time %d.%d minutes.", t/10, t%10);
info("Sent %d bytes, received %d bytes.",
link_stats.bytes_out, link_stats.bytes_in);
}
/*
* Delete pid file before disestablishing ppp. Otherwise it
* can happen that another pppd gets the same unit and then
* we delete its pid file.
*/
if (!demand) {
if (pidfilename[0] != 0
&& unlink(pidfilename) < 0 && errno != ENOENT)
warn("unable to delete pid file %s: %m", pidfilename);
pidfilename[0] = 0;
}
/*
* If we may want to bring the link up again, transfer
* the ppp unit back to the loopback. Set the
* real serial device back to its normal mode of operation.
*/
remove_fd(fd_ppp);
clean_check();
if (demand)
restore_loop();
disestablish_ppp(ttyfd);
fd_ppp = -1;
if (!hungup)
lcp_lowerdown(0);
/*
* Run disconnector script, if requested.
* XXX we may not be able to do this if the line has hung up!
*/
disconnect:
if (disconnect_script && !hungup) {
new_phase(PHASE_DISCONNECT);
if (real_ttyfd >= 0)
set_up_tty(real_ttyfd, 1);
if (device_script(disconnect_script, ttyfd, ttyfd, 0) < 0) {
warn("disconnect script failed");
} else {
info("Serial link disconnected.");
}
}
fail:
if (pty_master >= 0)
close(pty_master);
if (pty_slave >= 0)
close(pty_slave);
if (real_ttyfd >= 0)
close_tty();
if (locked) {
unlock();
locked = 0;
}
if (!demand) {
if (pidfilename[0] != 0
&& unlink(pidfilename) < 0 && errno != ENOENT)
warn("unable to delete pid file %s: %m", pidfilename);
pidfilename[0] = 0;
}
if (!persist || (maxfail > 0 && unsuccess >= maxfail))
break;
kill_link = 0;
if (demand)
demand_discard();
t = need_holdoff? holdoff: 0;
if (holdoff_hook)
t = (*holdoff_hook)();
if (t > 0) {
new_phase(PHASE_HOLDOFF);
TIMEOUT(holdoff_end, NULL, t);
do {
if (sigsetjmp(sigjmp, 1) == 0) {
sigprocmask(SIG_BLOCK, &mask, NULL);
if (kill_link || got_sigchld) {
sigprocmask(SIG_UNBLOCK, &mask, NULL);
} else {
waiting = 1;
sigprocmask(SIG_UNBLOCK, &mask, NULL);
wait_input(timeleft(&timo));
}
}
waiting = 0;
calltimeout();
if (kill_link) {
kill_link = 0;
new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
}
if (got_sigchld)
reap_kids(0);
} while (phase == PHASE_HOLDOFF);
if (!persist)
break;
}
}
/* Wait for scripts to finish */
/* XXX should have a timeout here */
while (n_children > 0) {
if (debug) {
struct subprocess *chp;
dbglog("Waiting for %d child processes...", n_children);
for (chp = children; chp != NULL; chp = chp->next)
dbglog(" script %s, pid %d", chp->prog, chp->pid);
}
if (reap_kids(1) < 0)
break;
}
die(status);
return 0;
}
/*
* detach - detach us from the controlling terminal.
*/
void
detach()
{
int pid;
if (detached)
return;
if ((pid = fork()) < 0) {
error("Couldn't detach (fork failed: %m)");
die(1); /* or just return? */
}
if (pid != 0) {
/* parent */
if (locked)
relock(pid);
exit(0); /* parent dies */
}
setsid();
chdir("/");
close(0);
close(1);
close(2);
detached = 1;
log_to_fd = -1;
/* update pid files if they have been written already */
if (pidfilename[0])
create_pidfile();
if (linkpidfile[0])
create_linkpidfile();
}
/*
* reopen_log - (re)open our connection to syslog.
*/
void
reopen_log()
{
#ifdef ULTRIX
openlog("pppd", LOG_PID);
#else
openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
setlogmask(LOG_UPTO(LOG_INFO));
#endif
}
/*
* Create a file containing our process ID.
*/
static void
create_pidfile()
{
FILE *pidfile;
char numbuf[16];
slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
_PATH_VARRUN, ifname);
if ((pidfile = fopen(pidfilename, "w")) != NULL) {
fprintf(pidfile, "%d\n", getpid());
(void) fclose(pidfile);
} else {
error("Failed to create pid file %s: %m", pidfilename);
pidfilename[0] = 0;
}
slprintf(numbuf, sizeof(numbuf), "%d", getpid());
script_setenv("PPPD_PID", numbuf);
if (linkpidfile[0])
create_linkpidfile();
}
static void
create_linkpidfile()
{
FILE *pidfile;
if (linkname[0] == 0)
return;
slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
_PATH_VARRUN, linkname);
if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
fprintf(pidfile, "%d\n", getpid());
if (pidfilename[0])
fprintf(pidfile, "%s\n", ifname);
(void) fclose(pidfile);
} else {
error("Failed to create pid file %s: %m", linkpidfile);
linkpidfile[0] = 0;
}
script_setenv("LINKNAME", linkname);
}
/*
* holdoff_end - called via a timeout when the holdoff period ends.
*/
static void
holdoff_end(arg)
void *arg;
{
new_phase(PHASE_DORMANT);
}
/* List of protocol names, to make our messages a little more informative. */
struct protocol_list {
u_short proto;
const char *name;
} protocol_list[] = {
{ 0x21, "IP" },
{ 0x23, "OSI Network Layer" },
{ 0x25, "Xerox NS IDP" },
{ 0x27, "DECnet Phase IV" },
{ 0x29, "Appletalk" },
{ 0x2b, "Novell IPX" },
{ 0x2d, "VJ compressed TCP/IP" },
{ 0x2f, "VJ uncompressed TCP/IP" },
{ 0x31, "Bridging PDU" },
{ 0x33, "Stream Protocol ST-II" },
{ 0x35, "Banyan Vines" },
{ 0x39, "AppleTalk EDDP" },
{ 0x3b, "AppleTalk SmartBuffered" },
{ 0x3d, "Multi-Link" },
{ 0x3f, "NETBIOS Framing" },
{ 0x41, "Cisco Systems" },
{ 0x43, "Ascom Timeplex" },
{ 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
{ 0x47, "DCA Remote Lan" },
{ 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
{ 0x4b, "SNA over 802.2" },
{ 0x4d, "SNA" },
{ 0x4f, "IP6 Header Compression" },
{ 0x6f, "Stampede Bridging" },
{ 0xfb, "single-link compression" },
{ 0xfd, "1st choice compression" },
{ 0x0201, "802.1d Hello Packets" },
{ 0x0203, "IBM Source Routing BPDU" },
{ 0x0205, "DEC LANBridge100 Spanning Tree" },
{ 0x0231, "Luxcom" },
{ 0x0233, "Sigma Network Systems" },
{ 0x8021, "Internet Protocol Control Protocol" },
{ 0x8023, "OSI Network Layer Control Protocol" },
{ 0x8025, "Xerox NS IDP Control Protocol" },
{ 0x8027, "DECnet Phase IV Control Protocol" },
{ 0x8029, "Appletalk Control Protocol" },
{ 0x802b, "Novell IPX Control Protocol" },
{ 0x8031, "Bridging NCP" },
{ 0x8033, "Stream Protocol Control Protocol" },
{ 0x8035, "Banyan Vines Control Protocol" },
{ 0x803d, "Multi-Link Control Protocol" },
{ 0x803f, "NETBIOS Framing Control Protocol" },
{ 0x8041, "Cisco Systems Control Protocol" },
{ 0x8043, "Ascom Timeplex" },
{ 0x8045, "Fujitsu LBLB Control Protocol" },
{ 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
{ 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
{ 0x804b, "SNA over 802.2 Control Protocol" },
{ 0x804d, "SNA Control Protocol" },
{ 0x804f, "IP6 Header Compression Control Protocol" },
{ 0x006f, "Stampede Bridging Control Protocol" },
{ 0x80fb, "Single Link Compression Control Protocol" },
{ 0x80fd, "Compression Control Protocol" },
{ 0xc021, "Link Control Protocol" },
{ 0xc023, "Password Authentication Protocol" },
{ 0xc025, "Link Quality Report" },
{ 0xc027, "Shiva Password Authentication Protocol" },
{ 0xc029, "CallBack Control Protocol (CBCP)" },
{ 0xc081, "Container Control Protocol" },
{ 0xc223, "Challenge Handshake Authentication Protocol" },
{ 0xc281, "Proprietary Authentication Protocol" },
{ 0, NULL },
};
/*
* protocol_name - find a name for a PPP protocol.
*/
const char *
protocol_name(proto)
int proto;
{
struct protocol_list *lp;
for (lp = protocol_list; lp->proto != 0; ++lp)
if (proto == lp->proto)
return lp->name;
return NULL;
}
/*
* get_input - called when incoming data is available.
*/
static void
get_input()
{
int len, i;
u_char *p;
u_short protocol;
struct protent *protp;
p = inpacket_buf; /* point to beginning of packet buffer */
len = read_packet(inpacket_buf);
if (len < 0)
return;
if (len == 0) {
notice("Modem hangup");
hungup = 1;
status = EXIT_HANGUP;
lcp_lowerdown(0); /* serial link is no longer available */
link_terminated(0);
return;
}
if (debug /*&& (debugflags & DBG_INPACKET)*/)
dbglog("rcvd %P", p, len);
if (len < PPP_HDRLEN) {
MAINDEBUG(("io(): Received short packet."));
return;
}
p += 2; /* Skip address and control */
GETSHORT(protocol, p);
len -= PPP_HDRLEN;
/*
* Toss all non-LCP packets unless LCP is OPEN.
*/
if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
return;
}
/*
* Until we get past the authentication phase, toss all packets
* except LCP, LQR and authentication packets.
*/
if (phase <= PHASE_AUTHENTICATE
&& !(protocol == PPP_LCP || protocol == PPP_LQR
|| protocol == PPP_PAP || protocol == PPP_CHAP)) {
MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
protocol, phase));
return;
}
/*
* Upcall the proper protocol input routine.
*/
for (i = 0; (protp = protocols[i]) != NULL; ++i) {
if (protp->protocol == protocol && protp->enabled_flag) {
(*protp->input)(0, p, len);
return;
}
if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
&& protp->datainput != NULL) {
(*protp->datainput)(0, p, len);
return;
}
}
if (debug) {
const char *pname = protocol_name(protocol);
if (pname != NULL)
warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
else
warn("Unsupported protocol 0x%x received", protocol);
}
lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
}
/*
* new_phase - signal the start of a new phase of pppd's operation.
*/
void
new_phase(p)
int p;
{
phase = p;
if (new_phase_hook)
(*new_phase_hook)(p);
}
/*
* die - clean up state and exit with the specified status.
*/
void
die(status)
int status;
{
cleanup();
syslog(LOG_INFO, "Exit.");
exit(status);
}
/*
* cleanup - restore anything which needs to be restored before we exit
*/
/* ARGSUSED */
static void
cleanup()
{
sys_cleanup();
if (fd_ppp >= 0)
disestablish_ppp(ttyfd);
if (real_ttyfd >= 0)
close_tty();
if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
warn("unable to delete pid file %s: %m", pidfilename);
pidfilename[0] = 0;
if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
warn("unable to delete pid file %s: %m", linkpidfile);
linkpidfile[0] = 0;
if (locked)
unlock();
}
/*
* close_tty - restore the terminal device and close it.
*/
static void
close_tty()
{
/* drop dtr to hang up */
if (!default_device && modem) {
setdtr(real_ttyfd, 0);
/*
* This sleep is in case the serial port has CLOCAL set by default,
* and consequently will reassert DTR when we close the device.
*/
sleep(1);
}
restore_tty(real_ttyfd);
if (tty_mode != (mode_t) -1) {
if (fchmod(real_ttyfd, tty_mode) != 0) {
/* XXX if devnam is a symlink, this will change the link */
chmod(devnam, tty_mode);
}
}
close(real_ttyfd);
real_ttyfd = -1;
}
/*
* update_link_stats - get stats at link termination.
*/
void
update_link_stats(u)
int u;
{
struct timeval now;
char numbuf[32];
if (!get_ppp_stats(u, &link_stats)
|| gettimeofday(&now, NULL) < 0)
return;
link_connect_time = now.tv_sec - start_time.tv_sec;
link_stats_valid = 1;
slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
script_setenv("CONNECT_TIME", numbuf);
slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out);
script_setenv("BYTES_SENT", numbuf);
slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in);
script_setenv("BYTES_RCVD", numbuf);
}
struct callout {
struct timeval c_time; /* time at which to call routine */
void *c_arg; /* argument to routine */
void (*c_func) __P((void *)); /* routine */
struct callout *c_next;
};
static struct callout *callout = NULL; /* Callout list */
static struct timeval timenow; /* Current time */
/*
* timeout - Schedule a timeout.
*
* Note that this timeout takes the number of seconds, NOT hz (as in
* the kernel).
*/
void
timeout(func, arg, time)
void (*func) __P((void *));
void *arg;
int time;
{
struct callout *newp, *p, **pp;
MAINDEBUG(("Timeout %p:%p in %d seconds.", func, arg, time));
/*
* Allocate timeout.
*/
if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
fatal("Out of memory in timeout()!");
newp->c_arg = arg;
newp->c_func = func;
gettimeofday(&timenow, NULL);
newp->c_time.tv_sec = timenow.tv_sec + time;
newp->c_time.tv_usec = timenow.tv_usec;
/*
* Find correct place and link it in.
*/
for (pp = &callout; (p = *pp); pp = &p->c_next)
if (newp->c_time.tv_sec < p->c_time.tv_sec
|| (newp->c_time.tv_sec == p->c_time.tv_sec
&& newp->c_time.tv_usec < p->c_time.tv_usec))
break;
newp->c_next = p;
*pp = newp;
}
/*
* untimeout - Unschedule a timeout.
*/
void
untimeout(func, arg)
void (*func) __P((void *));
void *arg;
{
struct callout **copp, *freep;
MAINDEBUG(("Untimeout %p:%p.", func, arg));
/*
* Find first matching timeout and remove it from the list.
*/
for (copp = &callout; (freep = *copp); copp = &freep->c_next)
if (freep->c_func == func && freep->c_arg == arg) {
*copp = freep->c_next;
free((char *) freep);
break;
}
}
/*
* calltimeout - Call any timeout routines which are now due.
*/
static void
calltimeout()
{
struct callout *p;
while (callout != NULL) {
p = callout;
if (gettimeofday(&timenow, NULL) < 0)
fatal("Failed to get time of day: %m");
if (!(p->c_time.tv_sec < timenow.tv_sec
|| (p->c_time.tv_sec == timenow.tv_sec
&& p->c_time.tv_usec <= timenow.tv_usec)))
break; /* no, it's not time yet */
callout = p->c_next;
(*p->c_func)(p->c_arg);
free((char *) p);
}
}
/*
* timeleft - return the length of time until the next timeout is due.
*/
static struct timeval *
timeleft(tvp)
struct timeval *tvp;
{
if (callout == NULL)
return NULL;
gettimeofday(&timenow, NULL);
tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
if (tvp->tv_usec < 0) {
tvp->tv_usec += 1000000;
tvp->tv_sec -= 1;
}
if (tvp->tv_sec < 0)
tvp->tv_sec = tvp->tv_usec = 0;
return tvp;
}
/*
* kill_my_pg - send a signal to our process group, and ignore it ourselves.
*/
static void
kill_my_pg(sig)
int sig;
{
struct sigaction act, oldact;
act.sa_handler = SIG_IGN;
act.sa_flags = 0;
kill(0, sig);
sigaction(sig, &act, &oldact);
sigaction(sig, &oldact, NULL);
}
/*
* hup - Catch SIGHUP signal.
*
* Indicates that the physical layer has been disconnected.
* We don't rely on this indication; if the user has sent this
* signal, we just take the link down.
*/
static void
hup(sig)
int sig;
{
info("Hangup (SIGHUP)");
kill_link = 1;
if (status != EXIT_HANGUP)
status = EXIT_USER_REQUEST;
if (conn_running)
/* Send the signal to the [dis]connector process(es) also */
kill_my_pg(sig);
if (charshunt_pid)
kill(charshunt_pid, sig);
if (waiting)
siglongjmp(sigjmp, 1);
}
/*
* term - Catch SIGTERM signal and SIGINT signal (^C/del).
*
* Indicates that we should initiate a graceful disconnect and exit.
*/
/*ARGSUSED*/
static void
term(sig)
int sig;
{
info("Terminating on signal %d.", sig);
persist = 0; /* don't try to restart */
kill_link = 1;
status = EXIT_USER_REQUEST;
if (conn_running)
/* Send the signal to the [dis]connector process(es) also */
kill_my_pg(sig);
if (charshunt_pid)
kill(charshunt_pid, sig);
if (waiting)
siglongjmp(sigjmp, 1);
}
/*
* chld - Catch SIGCHLD signal.
* Sets a flag so we will call reap_kids in the mainline.
*/
static void
chld(sig)
int sig;
{
got_sigchld = 1;
if (waiting)
siglongjmp(sigjmp, 1);
}
/*
* toggle_debug - Catch SIGUSR1 signal.
*
* Toggle debug flag.
*/
/*ARGSUSED*/
static void
toggle_debug(sig)
int sig;
{
debug = !debug;
if (debug) {
setlogmask(LOG_UPTO(LOG_DEBUG));
} else {
setlogmask(LOG_UPTO(LOG_WARNING));
}
}
/*
* open_ccp - Catch SIGUSR2 signal.
*
* Try to (re)negotiate compression.
*/
/*ARGSUSED*/
static void
open_ccp(sig)
int sig;
{
open_ccp_flag = 1;
if (waiting)
siglongjmp(sigjmp, 1);
}
/*
* bad_signal - We've caught a fatal signal. Clean up state and exit.
*/
static void
bad_signal(sig)
int sig;
{
static int crashed = 0;
if (crashed)
_exit(127);
crashed = 1;
error("Fatal signal %d", sig);
if (conn_running)
kill_my_pg(SIGTERM);
if (charshunt_pid)
kill(charshunt_pid, SIGTERM);
die(127);
}
/*
* device_script - run a program to talk to the serial device
* (e.g. to run the connector or disconnector script).
*/
static int
device_script(program, in, out, dont_wait)
char *program;
int in, out;
int dont_wait;
{
int pid;
int status = -1;
int errfd;
++conn_running;
pid = fork();
if (pid < 0) {
--conn_running;
error("Failed to create child process: %m");
return -1;
}
if (pid == 0) {
sys_close();
closelog();
if (in == 2) {
/* aargh!!! */
int newin = dup(in);
if (in == out)
out = newin;
in = newin;
} else if (out == 2) {
out = dup(out);
}
if (log_to_fd >= 0) {
if (log_to_fd != 2)
dup2(log_to_fd, 2);
} else {
close(2);
errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
if (errfd >= 0 && errfd != 2) {
dup2(errfd, 2);
close(errfd);
}
}
if (in != 0) {
if (out == 0)
out = dup(out);
dup2(in, 0);
}
if (out != 1) {
dup2(out, 1);
}
if (real_ttyfd > 2)
close(real_ttyfd);
if (pty_master > 2)
close(pty_master);
if (pty_slave > 2)
close(pty_slave);
setuid(uid);
if (getuid() != uid) {
error("setuid failed");
exit(1);
}
setgid(getgid());
execl("/bin/sh", "sh", "-c", program, (char *)0);
error("could not exec /bin/sh: %m");
exit(99);
/* NOTREACHED */
}
if (dont_wait) {
record_child(pid, program, NULL, NULL);
status = 0;
} else {
while (waitpid(pid, &status, 0) < 0) {
if (errno == EINTR)
continue;
fatal("error waiting for (dis)connection process: %m");
}
--conn_running;
}
return (status == 0 ? 0 : -1);
}
/*
* run-program - execute a program with given arguments,
* but don't wait for it.
* If the program can't be executed, logs an error unless
* must_exist is 0 and the program file doesn't exist.
* Returns -1 if it couldn't fork, 0 if the file doesn't exist
* or isn't an executable plain file, or the process ID of the child.
* If done != NULL, (*done)(arg) will be called later (within
* reap_kids) iff the return value is > 0.
*/
pid_t
run_program(prog, args, must_exist, done, arg)
char *prog;
char **args;
int must_exist;
void (*done) __P((void *));
void *arg;
{
int pid;
struct stat sbuf;
/*
* First check if the file exists and is executable.
* We don't use access() because that would use the
* real user-id, which might not be root, and the script
* might be accessible only to root.
*/
errno = EINVAL;
if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
|| (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
if (must_exist || errno != ENOENT)
warn("Can't execute %s: %m", prog);
return 0;
}
pid = fork();
if (pid == -1) {
error("Failed to create child process for %s: %m", prog);
return -1;
}
if (pid == 0) {
int new_fd;
/* Leave the current location */
(void) setsid(); /* No controlling tty. */
(void) umask (S_IRWXG|S_IRWXO);
(void) chdir ("/"); /* no current directory. */
setuid(0); /* set real UID = root */
setgid(getegid());
/* Ensure that nothing of our device environment is inherited. */
sys_close();
closelog();
close (0);
close (1);
close (2);
close (ttyfd); /* tty interface to the ppp device */
if (real_ttyfd >= 0)
close(real_ttyfd);
/* Don't pass handles to the PPP device, even by accident. */
new_fd = open (_PATH_DEVNULL, O_RDWR);
if (new_fd >= 0) {
if (new_fd != 0) {
dup2 (new_fd, 0); /* stdin <- /dev/null */
close (new_fd);
}
dup2 (0, 1); /* stdout -> /dev/null */
dup2 (0, 2); /* stderr -> /dev/null */
}
#ifdef BSD
/* Force the priority back to zero if pppd is running higher. */
if (setpriority (PRIO_PROCESS, 0, 0) < 0)
warn("can't reset priority to 0: %m");
#endif
/* SysV recommends a second fork at this point. */
/* run the program */
execve(prog, args, script_env);
if (must_exist || errno != ENOENT) {
/* have to reopen the log, there's nowhere else
for the message to go. */
reopen_log();
syslog(LOG_ERR, "Can't execute %s: %m", prog);
closelog();
}
_exit(-1);
}
if (debug)
dbglog("Script %s started (pid %d)", prog, pid);
record_child(pid, prog, done, arg);
return pid;
}
/*
* record_child - add a child process to the list for reap_kids
* to use.
*/
static void
record_child(pid, prog, done, arg)
int pid;
char *prog;
void (*done) __P((void *));
void *arg;
{
struct subprocess *chp;
++n_children;
chp = (struct subprocess *) malloc(sizeof(struct subprocess));
if (chp == NULL) {
warn("losing track of %s process", prog);
} else {
chp->pid = pid;
chp->prog = prog;
chp->done = done;
chp->arg = arg;
chp->next = children;
children = chp;
}
}
/*
* reap_kids - get status from any dead child processes,
* and log a message for abnormal terminations.
*/
static int
reap_kids(waitfor)
int waitfor;
{
int pid, status;
struct subprocess *chp, **prevp;
got_sigchld = 0;
if (n_children == 0)
return 0;
while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
&& pid != 0) {
--n_children;
for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
if (chp->pid == pid) {
*prevp = chp->next;
break;
}
}
if (WIFSIGNALED(status)) {
warn("Child process %s (pid %d) terminated with signal %d",
(chp? chp->prog: "??"), pid, WTERMSIG(status));
} else if (debug)
dbglog("Script %s finished (pid %d), status = 0x%x",
(chp? chp->prog: "??"), pid, status);
if (chp && chp->done)
(*chp->done)(chp->arg);
if (chp)
free(chp);
}
if (pid == -1) {
if (errno == ECHILD)
return -1;
if (errno != EINTR)
error("Error waiting for child process: %m");
}
return 0;
}
/*
* novm - log an error message saying we ran out of memory, and die.
*/
void
novm(msg)
char *msg;
{
fatal("Virtual memory exhausted allocating %s\n", msg);
}
/*
* script_setenv - set an environment variable value to be used
* for scripts that we run (e.g. ip-up, auth-up, etc.)
*/
void
script_setenv(var, value)
char *var, *value;
{
size_t vl = strlen(var) + strlen(value) + 2;
int i;
char *p, *newstring;
newstring = (char *) malloc(vl);
if (newstring == 0)
return;
slprintf(newstring, vl, "%s=%s", var, value);
/* check if this variable is already set */
if (script_env != 0) {
for (i = 0; (p = script_env[i]) != 0; ++i) {
if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
free(p);
script_env[i] = newstring;
return;
}
}
} else {
/* no space allocated for script env. ptrs. yet */
i = 0;
script_env = (char **) malloc(16 * sizeof(char *));
if (script_env == 0)
return;
s_env_nalloc = 16;
}
/* reallocate script_env with more space if needed */
if (i + 1 >= s_env_nalloc) {
int new_n = i + 17;
char **newenv = (char **) realloc((void *)script_env,
new_n * sizeof(char *));
if (newenv == 0)
return;
script_env = newenv;
s_env_nalloc = new_n;
}
script_env[i] = newstring;
script_env[i+1] = 0;
}
/*
* script_unsetenv - remove a variable from the environment
* for scripts.
*/
void
script_unsetenv(var)
char *var;
{
int vl = strlen(var);
int i;
char *p;
if (script_env == 0)
return;
for (i = 0; (p = script_env[i]) != 0; ++i) {
if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
free(p);
while ((script_env[i] = script_env[i+1]) != 0)
++i;
break;
}
}
}
/*
* start_charshunt - create a child process to run the character shunt.
*/
static int
start_charshunt(ifd, ofd)
int ifd, ofd;
{
int cpid;
cpid = fork();
if (cpid == -1) {
error("Can't fork process for character shunt: %m");
return 0;
}
if (cpid == 0) {
/* child */
close(pty_slave);
setuid(uid);
if (getuid() != uid)
fatal("setuid failed");
setgid(getgid());
if (!nodetach)
log_to_fd = -1;
charshunt(ifd, ofd, record_file);
exit(0);
}
charshunt_pid = cpid;
close(pty_master);
pty_master = -1;
ttyfd = pty_slave;
record_child(cpid, "pppd (charshunt)", charshunt_done, NULL);
return 1;
}
static void
charshunt_done(arg)
void *arg;
{
charshunt_pid = 0;
}
/*
* charshunt - the character shunt, which passes characters between
* the pty master side and the serial port (or stdin/stdout).
* This runs as the user (not as root).
* (We assume ofd >= ifd which is true the way this gets called. :-).
*/
static void
charshunt(ifd, ofd, record_file)
int ifd, ofd;
char *record_file;
{
int n, nfds;
fd_set ready, writey;
u_char *ibufp, *obufp;
int nibuf, nobuf;
int flags;
int pty_readable, stdin_readable;
struct timeval lasttime;
FILE *recordf = NULL;
/*
* Reset signal handlers.
*/
signal(SIGHUP, SIG_IGN); /* Hangup */
signal(SIGINT, SIG_DFL); /* Interrupt */
signal(SIGTERM, SIG_DFL); /* Terminate */
signal(SIGCHLD, SIG_DFL);
signal(SIGUSR1, SIG_DFL);
signal(SIGUSR2, SIG_DFL);
signal(SIGABRT, SIG_DFL);
signal(SIGALRM, SIG_DFL);
signal(SIGFPE, SIG_DFL);
signal(SIGILL, SIG_DFL);
signal(SIGPIPE, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
signal(SIGSEGV, SIG_DFL);
#ifdef SIGBUS
signal(SIGBUS, SIG_DFL);
#endif
#ifdef SIGEMT
signal(SIGEMT, SIG_DFL);
#endif
#ifdef SIGPOLL
signal(SIGPOLL, SIG_DFL);
#endif
#ifdef SIGPROF
signal(SIGPROF, SIG_DFL);
#endif
#ifdef SIGSYS
signal(SIGSYS, SIG_DFL);
#endif
#ifdef SIGTRAP
signal(SIGTRAP, SIG_DFL);
#endif
#ifdef SIGVTALRM
signal(SIGVTALRM, SIG_DFL);
#endif
#ifdef SIGXCPU
signal(SIGXCPU, SIG_DFL);
#endif
#ifdef SIGXFSZ
signal(SIGXFSZ, SIG_DFL);
#endif
/*
* Open the record file if required.
*/
if (record_file != NULL) {
recordf = fopen(record_file, "a");
if (recordf == NULL)
error("Couldn't create record file %s: %m", record_file);
}
/* set all the fds to non-blocking mode */
flags = fcntl(pty_master, F_GETFL);
if (flags == -1
|| fcntl(pty_master, F_SETFL, flags | O_NONBLOCK) == -1)
warn("couldn't set pty master to nonblock: %m");
flags = fcntl(ifd, F_GETFL);
if (flags == -1
|| fcntl(ifd, F_SETFL, flags | O_NONBLOCK) == -1)
warn("couldn't set %s to nonblock: %m", (ifd==0? "stdin": "tty"));
if (ofd != ifd) {
flags = fcntl(ofd, F_GETFL);
if (flags == -1
|| fcntl(ofd, F_SETFL, flags | O_NONBLOCK) == -1)
warn("couldn't set stdout to nonblock: %m");
}
nibuf = nobuf = 0;
ibufp = obufp = NULL;
pty_readable = stdin_readable = 1;
nfds = (ofd > pty_master? ofd: pty_master) + 1;
if (recordf != NULL) {
gettimeofday(&lasttime, NULL);
putc(7, recordf); /* put start marker */
putc(lasttime.tv_sec >> 24, recordf);
putc(lasttime.tv_sec >> 16, recordf);
putc(lasttime.tv_sec >> 8, recordf);
putc(lasttime.tv_sec, recordf);
lasttime.tv_usec = 0;
}
while (nibuf != 0 || nobuf != 0 || pty_readable || stdin_readable) {
FD_ZERO(&ready);
FD_ZERO(&writey);
if (nibuf != 0)
FD_SET(pty_master, &writey);
else if (stdin_readable)
FD_SET(ifd, &ready);
if (nobuf != 0)
FD_SET(ofd, &writey);
else if (pty_readable)
FD_SET(pty_master, &ready);
if (select(nfds, &ready, &writey, NULL, NULL) < 0) {
if (errno != EINTR)
fatal("select");
continue;
}
if (FD_ISSET(ifd, &ready)) {
ibufp = inpacket_buf;
nibuf = read(ifd, ibufp, sizeof(inpacket_buf));
if (nibuf < 0 && errno == EIO)
nibuf = 0;
if (nibuf < 0) {
if (!(errno == EINTR || errno == EAGAIN)) {
error("Error reading standard input: %m");
break;
}
nibuf = 0;
} else if (nibuf == 0) {
/* end of file from stdin */
stdin_readable = 0;
/* do a 0-length write, hopefully this will generate
an EOF (hangup) on the slave side. */
write(pty_master, inpacket_buf, 0);
if (recordf)
if (!record_write(recordf, 4, NULL, 0, &lasttime))
recordf = NULL;
} else {
FD_SET(pty_master, &writey);
if (recordf)
if (!record_write(recordf, 2, ibufp, nibuf, &lasttime))
recordf = NULL;
}
}
if (FD_ISSET(pty_master, &ready)) {
obufp = outpacket_buf;
nobuf = read(pty_master, obufp, sizeof(outpacket_buf));
if (nobuf < 0 && errno == EIO)
nobuf = 0;
if (nobuf < 0) {
if (!(errno == EINTR || errno == EAGAIN)) {
error("Error reading pseudo-tty master: %m");
break;
}
nobuf = 0;
} else if (nobuf == 0) {
/* end of file from the pty - slave side has closed */
pty_readable = 0;
stdin_readable = 0; /* pty is not writable now */
nibuf = 0;
close(ofd);
if (recordf)
if (!record_write(recordf, 3, NULL, 0, &lasttime))
recordf = NULL;
} else {
FD_SET(ofd, &writey);
if (recordf)
if (!record_write(recordf, 1, obufp, nobuf, &lasttime))
recordf = NULL;
}
}
if (FD_ISSET(ofd, &writey)) {
n = write(ofd, obufp, nobuf);
if (n < 0) {
if (errno != EIO) {
error("Error writing standard output: %m");
break;
}
pty_readable = 0;
nobuf = 0;
} else {
obufp += n;
nobuf -= n;
}
}
if (FD_ISSET(pty_master, &writey)) {
n = write(pty_master, ibufp, nibuf);
if (n < 0) {
if (errno != EIO) {
error("Error writing pseudo-tty master: %m");
break;
}
stdin_readable = 0;
nibuf = 0;
} else {
ibufp += n;
nibuf -= n;
}
}
}
exit(0);
}
static int
record_write(f, code, buf, nb, tp)
FILE *f;
int code;
u_char *buf;
int nb;
struct timeval *tp;
{
struct timeval now;
int diff;
gettimeofday(&now, NULL);
now.tv_usec /= 100000; /* actually 1/10 s, not usec now */
diff = (now.tv_sec - tp->tv_sec) * 10 + (now.tv_usec - tp->tv_usec);
if (diff > 0) {
if (diff > 255) {
putc(5, f);
putc(diff >> 24, f);
putc(diff >> 16, f);
putc(diff >> 8, f);
putc(diff, f);
} else {
putc(6, f);
putc(diff, f);
}
*tp = now;
}
putc(code, f);
if (buf != NULL) {
putc(nb >> 8, f);
putc(nb, f);
fwrite(buf, nb, 1, f);
}
fflush(f);
if (ferror(f)) {
error("Error writing record file: %m");
return 0;
}
return 1;
}
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