1 files changed, 0 insertions, 1846 deletions

diff --git a/mdk-stage1/ppp/pppd/main.c b/mdk-stage1/ppp/pppd/main.c
deleted file mode 100644
index c074938cd..000000000
--- a/mdk-stage1/ppp/pppd/main.c
+++ /dev/null
@@ -1,1846 +0,0 @@
-/*
- * 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	"$Id$"
-
-#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 <arpa/inet.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 "tdb.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 */
-
-struct channel *the_channel;
-
-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 */
-char ppp_devnam[MAXPATHLEN];	/* name of PPP tty (maybe ttypx) */
-uid_t uid;			/* Our real user-id */
-struct notifier *pidchange = NULL;
-struct notifier *phasechange = NULL;
-struct notifier *exitnotify = NULL;
-struct notifier *sigreceived = NULL;
-
-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 */
-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 */
-TDB_CONTEXT *pppdb;		/* database for storing status etc. */
-char db_key[32];
-
-int (*holdoff_hook) __P((void)) = NULL;
-int (*new_phase_hook) __P((int)) = NULL;
-
-static int conn_running;	/* we have a [dis]connector running */
-static int devfd;		/* fd of underlying device */
-static int fd_ppp = -1;		/* fd for talking PPP */
-static int fd_loop;		/* fd for getting demand-dial packets */
-
-int phase;			/* where the link is at */
-int kill_link;
-int open_ccp_flag;
-int listen_time;
-int got_sigusr2;
-int got_sigterm;
-int got_sighup;
-
-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 */
-
-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;
-
-/*
- * 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 setup_signals __P((void));
-static void create_pidfile __P((void));
-static void create_linkpidfile __P((void));
-static void cleanup __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 reap_kids __P((int waitfor));
-static void update_db_entry __P((void));
-static void add_db_key __P((const char *));
-static void delete_db_key __P((const char *));
-static void cleanup_db __P((void));
-static void handle_events __P((void));
-
-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
-};
-
-/*
- * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
- */
-#if !defined(PPP_DRV_NAME)
-#define PPP_DRV_NAME	"ppp"
-#endif /* !defined(PPP_DRV_NAME) */
-
-int
-main(argc, argv)
-    int argc;
-    char *argv[];
-{
-    int i, t;
-    char *p;
-    struct passwd *pw;
-    struct protent *protp;
-    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, 0);
-
-    ngroups = getgroups(NGROUPS_MAX, groups);
-
-    /*
-     * Initialize magic number generator now so that protocols may
-     * use magic numbers in initialization.
-     */
-    magic_init();
-
-    /*
-     * Initialize each protocol.
-     */
-    for (i = 0; (protp = protocols[i]) != NULL; ++i)
-        (*protp->init)(0);
-
-    /*
-     * Initialize the default channel.
-     */
-    tty_init();
-
-    progname = *argv;
-
-    /*
-     * Parse, in order, the system options file, the user's options file,
-     * and the command line arguments.
-     */
-    if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
-	|| !options_from_user()
-	|| !parse_args(argc-1, argv+1))
-	exit(EXIT_OPTION_ERROR);
-    devnam_fixed = 1;		/* can no longer change device name */
-
-    /*
-     * Work out the device name, if it hasn't already been specified,
-     * and parse the tty's options file.
-     */
-    if (the_channel->process_extra_options)
-	(*the_channel->process_extra_options)();
-
-    if (debug)
-	setlogmask(LOG_UPTO(LOG_DEBUG));
-
-    /*
-     * 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("%s", no_ppp_msg);
-	exit(EXIT_NO_KERNEL_SUPPORT);
-    }
-
-    /*
-     * Check that the options given are valid and consistent.
-     */
-    check_options();
-    if (!sys_check_options())
-	exit(EXIT_OPTION_ERROR);
-    auth_check_options();
-#ifdef HAVE_MULTILINK
-    mp_check_options();
-#endif
-    for (i = 0; (protp = protocols[i]) != NULL; ++i)
-	if (protp->check_options != NULL)
-	    (*protp->check_options)();
-    if (the_channel->check_options)
-	(*the_channel->check_options)();
-
-
-    if (dump_options || dryrun) {
-	init_pr_log(NULL, LOG_INFO);
-	print_options(pr_log, NULL);
-	end_pr_log();
-	if (dryrun)
-	    die(0);
-    }
-
-    /*
-     * Initialize system-dependent stuff.
-     */
-    sys_init();
-
-    pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
-    if (pppdb != NULL) {
-	slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
-	update_db_entry();
-    } else {
-	warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
-	if (multilink) {
-	    warn("Warning: disabling multilink");
-	    multilink = 0;
-	}
-    }
-
-    /*
-     * 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 started by %s, uid %d", VERSION, p, uid);
-    script_setenv("PPPLOGNAME", p, 0);
-
-    if (devnam[0])
-	script_setenv("DEVICE", devnam, 1);
-    slprintf(numbuf, sizeof(numbuf), "%d", getpid());
-    script_setenv("PPPD_PID", numbuf, 1);
-
-    setup_signals();
-
-    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.
-	 */
-	tdb_writelock(pppdb);
-	fd_loop = open_ppp_loopback();
-	set_ifunit(1);
-	tdb_writeunlock(pppdb);
-
-	/*
-	 * Configure the interface and mark it up, etc.
-	 */
-	demand_conf();
-    }
-
-    do_callback = 0;
-    for (;;) {
-
-	listen_time = 0;
-	need_holdoff = 1;
-	devfd = -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.
-	     */
-	    new_phase(PHASE_DORMANT);
-	    demand_unblock();
-	    add_fd(fd_loop);
-	    for (;;) {
-		handle_events();
-		if (kill_link && !persist)
-		    break;
-		if (get_loop_output())
-		    break;
-	    }
-	    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);
-
-	devfd = the_channel->connect();
-	if (devfd < 0)
-	    goto fail;
-
-	/* set up the serial device as a ppp interface */
-	tdb_writelock(pppdb);
-	fd_ppp = the_channel->establish_ppp(devfd);
-	if (fd_ppp < 0) {
-	    tdb_writeunlock(pppdb);
-	    status = EXIT_FATAL_ERROR;
-	    goto disconnect;
-	}
-
-	if (!demand && ifunit >= 0)
-	    set_ifunit(1);
-	tdb_writeunlock(pppdb);
-
-	/*
-	 * 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);
-
-	add_fd(fd_ppp);
-	lcp_open(0);		/* Start protocol */
-	status = EXIT_NEGOTIATION_FAILED;
-	new_phase(PHASE_ESTABLISH);
-	while (phase != PHASE_DEAD) {
-	    handle_events();
-	    get_input();
-	    if (kill_link)
-		lcp_close(0, "User request");
-	    if (open_ccp_flag) {
-		if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
-		    ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
-		    (*ccp_protent.open)(0);
-		}
-	    }
-	}
-
-	/*
-	 * 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 %u bytes, received %u 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();
-	the_channel->disestablish_ppp(devfd);
-	fd_ppp = -1;
-	if (!hungup)
-	    lcp_lowerdown(0);
-	if (!demand)
-	    script_unsetenv("IFNAME");
-
-	/*
-	 * Run disconnector script, if requested.
-	 * XXX we may not be able to do this if the line has hung up!
-	 */
-    disconnect:
-	new_phase(PHASE_DISCONNECT);
-	the_channel->disconnect();
-
-    fail:
-	if (the_channel->cleanup)
-	    (*the_channel->cleanup)();
-
-	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;
-
-	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 {
-		handle_events();
-		if (kill_link)
-		    new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
-	    } 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;
-}
-
-/*
- * handle_events - wait for something to happen and respond to it.
- */
-static void
-handle_events()
-{
-    struct timeval timo;
-    sigset_t mask;
-
-    kill_link = open_ccp_flag = 0;
-    if (sigsetjmp(sigjmp, 1) == 0) {
-	sigprocmask(SIG_BLOCK, &mask, NULL);
-	if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
-	    sigprocmask(SIG_UNBLOCK, &mask, NULL);
-	} else {
-	    waiting = 1;
-	    sigprocmask(SIG_UNBLOCK, &mask, NULL);
-	    wait_input(timeleft(&timo));
-	}
-    }
-    waiting = 0;
-    calltimeout();
-    if (got_sighup) {
-	kill_link = 1;
-	got_sighup = 0;
-	if (status != EXIT_HANGUP)
-	    status = EXIT_USER_REQUEST;
-    }
-    if (got_sigterm) {
-	kill_link = 1;
-	persist = 0;
-	status = EXIT_USER_REQUEST;
-	got_sigterm = 0;
-    }
-    if (got_sigchld) {
-	reap_kids(0);	/* Don't leave dead kids lying around */
-	got_sigchld = 0;
-    }
-    if (got_sigusr2) {
-	open_ccp_flag = 1;
-	got_sigusr2 = 0;
-    }
-}
-
-/*
- * setup_signals - initialize signal handling.
- */
-static void
-setup_signals()
-{
-    struct sigaction sa;
-    sigset_t mask;
-
-    /*
-     * 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);
-}
-
-/*
- * set_ifunit - do things we need to do once we know which ppp
- * unit we are using.
- */
-void
-set_ifunit(iskey)
-    int iskey;
-{
-    info("Using interface %s%d", PPP_DRV_NAME, ifunit);
-    slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
-    script_setenv("IFNAME", ifname, iskey);
-    if (iskey) {
-	create_pidfile();	/* write pid to file */
-	create_linkpidfile();
-    }
-}
-
-/*
- * detach - detach us from the controlling terminal.
- */
-void
-detach()
-{
-    int pid;
-    char numbuf[16];
-
-    if (detached)
-	return;
-    if ((pid = fork()) < 0) {
-	error("Couldn't detach (fork failed: %m)");
-	die(1);			/* or just return? */
-    }
-    if (pid != 0) {
-	/* parent */
-	notify(pidchange, pid);
-	exit(0);		/* parent dies */
-    }
-    setsid();
-    chdir("/");
-    close(0);
-    close(1);
-    close(2);
-    detached = 1;
-    if (log_default)
-	log_to_fd = -1;
-    /* update pid files if they have been written already */
-    if (pidfilename[0])
-	create_pidfile();
-    if (linkpidfile[0])
-	create_linkpidfile();
-    slprintf(numbuf, sizeof(numbuf), "%d", getpid());
-    script_setenv("PPPD_PID", numbuf, 1);
-}
-
-/*
- * 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;
-
-    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;
-    }
-}
-
-static void
-create_linkpidfile()
-{
-    FILE *pidfile;
-
-    if (linkname[0] == 0)
-	return;
-    script_setenv("LINKNAME", linkname, 1);
-    slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
-	     _PATH_VARRUN, linkname);
-    if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
-	fprintf(pidfile, "%d\n", getpid());
-	if (ifname[0])
-	    fprintf(pidfile, "%s\n", ifname);
-	(void) fclose(pidfile);
-    } else {
-	error("Failed to create pid file %s: %m", linkpidfile);
-	linkpidfile[0] = 0;
-    }
-}
-
-/*
- * 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);
-    notify(phasechange, p);
-}
-
-/*
- * die - clean up state and exit with the specified status.
- */
-void
-die(status)
-    int status;
-{
-    cleanup();
-    notify(exitnotify, status);
-    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)
-	the_channel->disestablish_ppp(devfd);
-    if (the_channel->cleanup)
-	(*the_channel->cleanup)();
-
-    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 (pppdb != NULL)
-	cleanup_db();
-}
-
-/*
- * 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, 0);
-    slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out);
-    script_setenv("BYTES_SENT", numbuf, 0);
-    slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in);
-    script_setenv("BYTES_RCVD", numbuf, 0);
-}
-
-
-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 milliseconds, NOT hz (as in
- * the kernel).
- */
-void
-timeout(func, arg, secs, usecs)
-    void (*func) __P((void *));
-    void *arg;
-    int secs, usecs;
-{
-    struct callout *newp, *p, **pp;
-  
-    MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
-	       time / 1000, time % 1000));
-  
-    /*
-     * 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 + secs;
-    newp->c_time.tv_usec = timenow.tv_usec + usecs;
-    if (newp->c_time.tv_usec >= 1000000) {
-	newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
-	newp->c_time.tv_usec %= 1000000;
-    }
-
-    /*
-     * 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)");
-    got_sighup = 1;
-    if (conn_running)
-	/* Send the signal to the [dis]connector process(es) also */
-	kill_my_pg(sig);
-    notify(sigreceived, 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);
-    got_sigterm = 1;
-    if (conn_running)
-	/* Send the signal to the [dis]connector process(es) also */
-	kill_my_pg(sig);
-    notify(sigreceived, 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;
-{
-    got_sigusr2 = 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);
-    notify(sigreceived, sig);
-    die(127);
-}
-
-
-/*
- * device_script - run a program to talk to the specified fds
- * (e.g. to run the connector or disconnector script).
- * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
- */
-int
-device_script(program, in, out, dont_wait)
-    char *program;
-    int in, out;
-    int dont_wait;
-{
-    int pid, fd;
-    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) {
-	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);
-    }
-
-    /* here we are executing in the child */
-    /* make sure fds 0, 1, 2 are occupied */
-    while ((fd = dup(in)) >= 0) {
-	if (fd > 2) {
-	    close(fd);
-	    break;
-	}
-    }
-
-    /* dup in and out to fds > 2 */
-    in = dup(in);
-    out = dup(out);
-    if (log_to_fd >= 0) {
-	errfd = dup(log_to_fd);
-    } else {
-	errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
-    }
-
-    /* close fds 0 - 2 and any others we can think of */
-    close(0);
-    close(1);
-    close(2);
-    sys_close();
-    if (the_channel->close)
-	(*the_channel->close)();
-    closelog();
-
-    /* dup the in, out, err fds to 0, 1, 2 */
-    dup2(in, 0);
-    close(in);
-    dup2(out, 1);
-    close(out);
-    if (errfd >= 0) {
-	dup2(errfd, 2);
-	close(errfd);
-    }
-
-    setuid(uid);
-    if (getuid() != uid) {
-	error("setuid failed");
-	exit(1);
-    }
-    setgid(getgid());
-    {
-	    int argc = 0;
-	    char * argv[500];
-	    char * ptr = program;
-	    while (ptr != NULL) {
-		    argv[argc] = ptr;
-		    argc++;
-		    ptr = strchr(ptr, ' ');
-		    if (ptr) {
-			    ptr[0] = '\0';
-			    ptr++;
-		    }
-	    }
-	    argv[argc] = NULL;
-	    execv(argv[0], argv);
-	    error("could not exec %s: %m", program);
-	    exit(99);
-    }
-    /* NOTREACHED */
-}
-
-
-/*
- * 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);
-	if (the_channel->close)
-	    (*the_channel->close)();
-
-        /* 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.
- */
-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;
-
-    if (n_children == 0)
-	return 0;
-    while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
-	   && pid != 0) {
-	for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
-	    if (chp->pid == pid) {
-		--n_children;
-		*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;
-}
-
-/*
- * add_notifier - add a new function to be called when something happens.
- */
-void
-add_notifier(notif, func, arg)
-    struct notifier **notif;
-    notify_func func;
-    void *arg;
-{
-    struct notifier *np;
-
-    np = malloc(sizeof(struct notifier));
-    if (np == 0)
-	novm("notifier struct");
-    np->next = *notif;
-    np->func = func;
-    np->arg = arg;
-    *notif = np;
-}
-
-/*
- * remove_notifier - remove a function from the list of things to
- * be called when something happens.
- */
-void
-remove_notifier(notif, func, arg)
-    struct notifier **notif;
-    notify_func func;
-    void *arg;
-{
-    struct notifier *np;
-
-    for (; (np = *notif) != 0; notif = &np->next) {
-	if (np->func == func && np->arg == arg) {
-	    *notif = np->next;
-	    free(np);
-	    break;
-	}
-    }
-}
-
-/*
- * notify - call a set of functions registered with add_notify.
- */
-void
-notify(notif, val)
-    struct notifier *notif;
-    int val;
-{
-    struct notifier *np;
-
-    while ((np = notif) != 0) {
-	notif = np->next;
-	(*np->func)(np->arg, val);
-    }
-}
-
-/*
- * 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, iskey)
-    char *var, *value;
-    int iskey;
-{
-    size_t varl = strlen(var);
-    size_t vl = varl + strlen(value) + 2;
-    int i;
-    char *p, *newstring;
-
-    newstring = (char *) malloc(vl+1);
-    if (newstring == 0)
-	return;
-    *newstring++ = iskey;
-    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, varl) == 0 && p[varl] == '=') {
-		if (p[-1] && pppdb != NULL)
-		    delete_db_key(p);
-		free(p-1);
-		script_env[i] = newstring;
-		if (iskey && pppdb != NULL)
-		    add_db_key(newstring);
-		update_db_entry();
-		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;
-
-    if (pppdb != NULL) {
-	if (iskey)
-	    add_db_key(newstring);
-	update_db_entry();
-    }
-}
-
-/*
- * 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] == '=') {
-	    if (p[-1] && pppdb != NULL)
-		delete_db_key(p);
-	    free(p-1);
-	    while ((script_env[i] = script_env[i+1]) != 0)
-		++i;
-	    break;
-	}
-    }
-    if (pppdb != NULL)
-	update_db_entry();
-}
-
-/*
- * update_db_entry - update our entry in the database.
- */
-static void
-update_db_entry()
-{
-    TDB_DATA key, dbuf;
-    int vlen, i;
-    char *p, *q, *vbuf;
-
-    if (script_env == NULL)
-	return;
-    vlen = 0;
-    for (i = 0; (p = script_env[i]) != 0; ++i)
-	vlen += strlen(p) + 1;
-    vbuf = malloc(vlen);
-    if (vbuf == 0)
-	novm("database entry");
-    q = vbuf;
-    for (i = 0; (p = script_env[i]) != 0; ++i)
-	q += slprintf(q, vbuf + vlen - q, "%s;", p);
-
-    key.dptr = db_key;
-    key.dsize = strlen(db_key);
-    dbuf.dptr = vbuf;
-    dbuf.dsize = vlen;
-    if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
-	error("tdb_store failed: %s", tdb_error(pppdb));
-
-}
-
-/*
- * add_db_key - add a key that we can use to look up our database entry.
- */
-static void
-add_db_key(str)
-    const char *str;
-{
-    TDB_DATA key, dbuf;
-
-    key.dptr = (char *) str;
-    key.dsize = strlen(str);
-    dbuf.dptr = db_key;
-    dbuf.dsize = strlen(db_key);
-    if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
-	error("tdb_store key failed: %s", tdb_error(pppdb));
-}
-
-/*
- * delete_db_key - delete a key for looking up our database entry.
- */
-static void
-delete_db_key(str)
-    const char *str;
-{
-    TDB_DATA key;
-
-    key.dptr = (char *) str;
-    key.dsize = strlen(str);
-    tdb_delete(pppdb, key);
-}
-
-/*
- * cleanup_db - delete all the entries we put in the database.
- */
-static void
-cleanup_db()
-{
-    TDB_DATA key;
-    int i;
-    char *p;
-
-    key.dptr = db_key;
-    key.dsize = strlen(db_key);
-    tdb_delete(pppdb, key);
-    for (i = 0; (p = script_env[i]) != 0; ++i)
-	if (p[-1])
-	    delete_db_key(p);
-}