X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Fmain.c;h=0722e9104076417b68500f16058a98f31f1e8f2d;hp=7de1d1374832dfb72915d3d0ea023fd70d7da5d6;hb=9b7089a0401b5d0973cace08f1f632d526a06377;hpb=8972198dbc3630137fc364c36f61d65abc36b21a;ds=sidebyside diff --git a/pppd/main.c b/pppd/main.c index 7de1d13..0722e91 100644 --- a/pppd/main.c +++ b/pppd/main.c @@ -17,293 +17,928 @@ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ -#ifndef lint -static char rcsid[] = "$Id: main.c,v 1.4 1993/12/15 00:17:43 paulus Exp $"; -#endif - -#define SETSID +#define RCSID "$Id: main.c,v 1.98 2000/04/29 12:32:59 paulus Exp $" #include +#include +#include +#include +#include #include #include #include #include #include #include - -/* - * If REQ_SYSOPTIONS is defined to 1, pppd will not run unless - * /etc/ppp/options exists. - */ -#ifndef REQ_SYSOPTIONS -#define REQ_SYSOPTIONS 0 -#endif - -#ifdef STREAMS -#undef SGTTY -#endif - -#ifdef SGTTY -#include -#else -#ifndef sun -#include -#endif -#include -#endif - +#include +#include #include #include +#include +#include +#include #include #include -#include - -#include "callout.h" - -#include -#include - -#include - -#ifndef BSD -#define BSD 43 -#endif /*BSD*/ +#include +#include -#include "ppp.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 "pppd.h" +#include "ccp.h" #include "pathnames.h" #include "patchlevel.h" +#include "tdb.h" +#ifdef CBCP_SUPPORT +#include "cbcp.h" +#endif -#ifndef TRUE -#define TRUE (1) -#endif /*TRUE*/ - -#ifndef FALSE -#define FALSE (0) -#endif /*FALSE*/ +#ifdef IPX_CHANGE +#include "ipxcp.h" +#endif /* IPX_CHANGE */ +#ifdef AT_CHANGE +#include "atcp.h" +#endif -#ifdef PIDPATH -static char *pidpath = PIDPATH; /* filename in which pid will be stored */ -#else -static char *pidpath = _PATH_PIDFILE; -#endif /* PIDFILE */ +static const char rcsid[] = RCSID; /* interface vars */ -char ifname[IFNAMSIZ]; /* Interface name */ +char ifname[32]; /* Interface name */ int ifunit; /* Interface unit number */ char *progname; /* Name of this program */ char hostname[MAXNAMELEN]; /* Our hostname */ -char our_name[MAXNAMELEN]; -char remote_name[MAXNAMELEN]; +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 = (mode_t)-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 */ +TDB_CONTEXT *pppdb; /* database for storing status etc. */ +char db_key[32]; -static pid_t pid; /* Our pid */ -static pid_t pgrpid; /* Process Group ID */ -static char pidfilename[MAXPATHLEN]; +int (*holdoff_hook) __P((void)) = NULL; +int (*new_phase_hook) __P((int)) = NULL; -char devname[MAXPATHLEN] = "/dev/tty"; /* Device name */ -int default_device = TRUE; /* use default device (stdin/out) */ +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 fd; /* Device file descriptor */ -int s; /* Socket file descriptor */ +int phase; /* where the link is at */ +int kill_link; +int open_ccp_flag; -#ifdef SGTTY -static struct sgttyb initsgttyb; /* Initial TTY sgttyb */ -#else -static struct termios inittermios; /* Initial TTY termios */ -#endif +static int waiting; +static sigjmp_buf sigjmp; -static int initfdflags = -1; /* Initial file descriptor flags */ +char **script_env; /* Env. variable values for scripts */ +int s_env_nalloc; /* # words avail at script_env */ -static int restore_term; /* 1 => we've munged the terminal */ +u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */ +u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */ -u_char outpacket_buf[MTU+DLLHEADERLEN]; /* buffer for outgoing packet */ -static u_char inpacket_buf[MTU+DLLHEADERLEN]; /* buffer for incoming packet */ +static int n_children; /* # child processes still running */ +static int got_sigchld; /* set if we have received a SIGCHLD */ -int hungup; /* terminal has been hung up */ +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"; -/* configured variables */ - -int debug = 0; /* Debug flag */ -char user[MAXNAMELEN]; /* username for PAP */ -char passwd[MAXSECRETLEN]; /* password for PAP */ -char *connector = NULL; /* "connect" command */ -int inspeed = 0; /* Input/Output speed */ -u_long netmask = 0; /* netmask to use on ppp interface */ -int crtscts = 0; /* use h/w flow control */ -int nodetach = 0; /* don't fork */ -int modem = 0; /* use modem control lines */ -int auth_required = 0; /* require peer to authenticate */ -int defaultroute = 0; /* assign default route through interface */ -int proxyarp = 0; /* set entry in arp table */ -int persist = 0; /* re-initiate on termination */ -int answer = 0; /* wait for incoming call */ -int uselogin = 0; /* check PAP info against /etc/passwd */ - - -/* prototypes */ -static void hup __ARGS((int, int, struct sigcontext *, char *)); -static void intr __ARGS((int, int, struct sigcontext *, char *)); -static void term __ARGS((int, int, struct sigcontext *, char *)); -static void alrm __ARGS((int, int, struct sigcontext *, char *)); -static void io __ARGS((int, int, struct sigcontext *, char *)); -static void incdebug __ARGS((int)); -static void nodebug __ARGS((int)); -void establish_ppp __ARGS((void)); - -void cleanup __ARGS((int, caddr_t)); -void die __ARGS((int)); -void dumpbuffer __ARGS((unsigned char *, int, int)); - -#ifdef STREAMS -extern char *ttyname __ARGS((int)); +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 setup_signals __P((void)); +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 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 int open_socket __P((char *)); +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 -extern char *getlogin __ARGS((void)); /* * PPP Data Link Layer "protocol" table. * One entry per supported protocol. + * The last entry must be NULL. */ -static struct protent { - u_short protocol; - void (*init)(); - void (*input)(); - void (*protrej)(); -} prottbl[] = { - { LCP, lcp_init, lcp_input, lcp_protrej }, - { IPCP, ipcp_init, ipcp_input, ipcp_protrej }, - { UPAP, upap_init, upap_input, upap_protrej }, - { CHAP, ChapInit, ChapInput, ChapProtocolReject }, +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 legacy "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 mask, i; - struct sigvec sv; - struct cmd *cmdp; - FILE *pidfile; - char *p; + int i, fdflags, t; + 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); /* - * Initialize syslog system and magic number package. + * 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 BSD >= 43 || defined(sun) - openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP); - setlogmask(LOG_UPTO(LOG_INFO)); -#else - openlog("pppd", LOG_PID); -#define LOG_UPTO(x) (x) -#define setlogmask(x) (x) -#endif + if ((i = open("/dev/null", O_RDWR)) >= 0) { + while (0 <= i && i <= 2) + i = dup(i); + if (i >= 0) + close(i); + } -#ifdef STREAMS - p = ttyname(fileno(stdin)); - if (p) - strcpy(devname, p); -#endif - - magic_init(); + script_env = NULL; + + /* Initialize syslog facilities */ + reopen_log(); if (gethostname(hostname, MAXNAMELEN) < 0 ) { - syslog(LOG_ERR, "couldn't get hostname: %m"); - die(1); + option_error("Couldn't get hostname: %m"); + exit(1); } hostname[MAXNAMELEN-1] = 0; - pid = getpid(); + /* make sure we don't create world or group writable files. */ + umask(umask(0777) | 022); - if (!ppp_available()) { - fprintf(stderr, "Sorry - PPP is not available on this system\n"); - exit(1); - } + 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 to the standard option set, then parse, in order, - * the system options file, the user's options file, and the command - * line arguments. + * the system options file, the user's options file, + * the tty's options file, and the command line arguments. */ - for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++) - (*prottbl[i].init)(0); - + for (i = 0; (protp = protocols[i]) != NULL; ++i) + (*protp->init)(0); + progname = *argv; - if (!options_from_file(_PATH_SYSOPTIONS, REQ_SYSOPTIONS) || - !options_from_user() || - !parse_args(argc-1, argv+1)) - die(1); - check_auth_options(); - setipdefault(); + prepass = 0; + if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1) + || !options_from_user()) + exit(EXIT_OPTION_ERROR); - p = getlogin(); - if (p == NULL) - p = "(unknown)"; - syslog(LOG_NOTICE, "pppd %s.%d started by %s, uid %d", - VERSION, PATCHLEVEL, p, getuid()); + /* scan command line and options files to find device name */ + prepass = 1; + parse_args(argc-1, argv+1); + prepass = 0; -#ifdef SETSID /* - * Make sure we can set the serial device to be our controlling terminal. + * Work out the device name, if it hasn't already been specified. */ - if (default_device) { + using_pty = notty || ptycommand != NULL || pty_socket != 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, pty_socket, 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(); +#ifdef HAVE_MULTILINK + mp_check_options(); +#endif + 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); + } + if (pty_socket != NULL && (ptycommand != NULL || notty)) { + option_error("socket option is incompatible with pty and notty"); + exit(EXIT_OPTION_ERROR); + } + default_device = notty; + lockflag = 0; + modem = 0; + if (notty && log_to_fd <= 1) + log_to_fd = -1; + } else { /* - * No device name was specified: - * we are in the device's session already. + * 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 ((pgrpid = getpgrp(0)) < 0) { - syslog(LOG_ERR, "getpgrp(0): %m"); - die(1); + 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; + /* + * Initialize system-dependent stuff. + */ + sys_init(); + if (debug) + setlogmask(LOG_UPTO(LOG_DEBUG)); + + 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.%d%s started by %s, uid %d", + VERSION, PATCHLEVEL, IMPLEMENTATION, 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) { /* - * Not default device: make sure we're not a process group leader, - * then become session leader of a new session (so we can make - * our device its controlling terminal and thus get SIGHUPs). + * Open the loopback channel and set it up to be the ppp interface. */ - if (!nodetach) { - /* fork so we're not a process group leader */ - if (pid = fork()) { - exit(0); /* parent is finished */ + 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 (;;) { + + 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); } - if (pid < 0) { - syslog(LOG_ERR, "fork: %m"); - die(1); + 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, socket, + * or record options were specified. + */ + strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam)); + pty_master = -1; + pty_slave = -1; + if (using_pty || 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; } - pid = getpid(); /* otherwise pid is 0 in child */ - } else { + 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; + /* - * try to put ourself into our parent's process group, - * so we're not a process group leader + * 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. */ - if (setpgrp(pid, getppid()) < 0) - syslog(LOG_WARNING, "setpgrp: %m"); + set_up_tty(ttyfd, ((connector != NULL && connector[0] != 0) + || initializer != NULL)); + real_ttyfd = ttyfd; + } + + /* + * If the pty, socket, 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 (pty_socket != NULL) { + int fd = open_socket(pty_socket); + if (fd < 0) + goto fail; + if (!start_charshunt(fd, fd)) + goto fail; + } 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; } - /* create new session */ - if ((pgrpid = setsid()) < 0) { - syslog(LOG_ERR, "setsid(): %m"); - die(1); + /* 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, 0); + + /* 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 */ + tdb_writelock(pppdb); + fd_ppp = establish_ppp(ttyfd); + 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); + + /* + * 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); + 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: + 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; } } -#endif - /* Get an internet socket for doing socket ioctl's on. */ - if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { - syslog(LOG_ERR, "socket : %m"); - die(1); + /* 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; +} + +/* + * 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, @@ -312,328 +947,379 @@ main(argc, argv) sigemptyset(&mask); sigaddset(&mask, SIGHUP); sigaddset(&mask, SIGINT); - sigaddset(&mask, SIGALRM); - sigaddset(&mask, SIGIO); -#ifdef STREAMS - sigaddset(&mask, SIGPOLL); -#endif - -#define SIGNAL(s, handler) { \ - sv.sv_handler = handler; \ - if (sigvec(s, &sv, NULL) < 0) { \ - syslog(LOG_ERR, "sigvec(%d): %m", s); \ - die(1); \ - } \ - } - - sv.sv_mask = mask; - sv.sv_flags = 0; + 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, intr); /* Interrupt */ + SIGNAL(SIGINT, term); /* Interrupt */ SIGNAL(SIGTERM, term); /* Terminate */ - SIGNAL(SIGALRM, alrm); /* Timeout */ - SIGNAL(SIGIO, io); /* Input available */ -#ifdef STREAMS - SIGNAL(SIGPOLL, io); /* Input available */ -#endif + SIGNAL(SIGCHLD, chld); - signal(SIGUSR1, incdebug); /* Increment debug flag */ - signal(SIGUSR2, nodebug); /* Reset debug flag */ - + SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */ + SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */ /* - * Open the serial device and set it up to be the ppp interface. + * Install a handler for other signals which would otherwise + * cause pppd to exit without cleaning up. */ - if ((fd = open(devname, O_RDWR /*| O_NDELAY*/)) < 0) { - syslog(LOG_ERR, "open(%s): %m", devname); - die(1); - } - hungup = 0; - - /* set device to be controlling tty */ - if (!default_device && ioctl(fd, TIOCSCTTY) < 0) { - syslog(LOG_ERR, "ioctl(TIOCSCTTY): %m"); - die(1); - } - - /* set line speed, flow control, etc. */ - set_up_tty(fd); + 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 - /* run connection script */ - if (connector) { - syslog(LOG_INFO, "Connecting with <%s>", connector); + /* + * 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); +} - /* drop dtr to hang up in case modem is off hook */ - if (!default_device && modem) { - setdtr(fd, FALSE); - sleep(1); - setdtr(fd, TRUE); - } +/* + * 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), PPP_DRV_NAME "%d", ifunit); + script_setenv("IFNAME", ifname, iskey); + if (iskey) { + create_pidfile(); /* write pid to file */ + create_linkpidfile(); + } +} - if (set_up_connection(connector, fd, fd) < 0) { - syslog(LOG_ERR, "could not set up connection"); - setdtr(fd, FALSE); - die(1); - } +/* + * detach - detach us from the controlling terminal. + */ +void +detach() +{ + int pid; + char numbuf[16]; - syslog(LOG_INFO, "Connected..."); - sleep(1); /* give it time to set up its terminal */ + if (detached) + return; + if ((pid = fork()) < 0) { + error("Couldn't detach (fork failed: %m)"); + die(1); /* or just return? */ } - - /* set up the serial device as a ppp interface */ - establish_ppp(); + if (pid != 0) { + /* parent */ + if (locked) + relock(pid); + exit(0); /* parent dies */ + } + setsid(); + chdir("/"); + close(0); + close(1); + close(2); + detached = 1; + if (!log_to_file && !log_to_specific_fd) + 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); +} - syslog(LOG_INFO, "Using interface ppp%d", ifunit); - (void) sprintf(ifname, "ppp%d", ifunit); +/* + * 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 +} - /* write pid to file */ - (void) sprintf(pidfilename, "%s/%s.pid", pidpath, ifname); +/* + * 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", pid); + fprintf(pidfile, "%d\n", getpid()); (void) fclose(pidfile); } else { - syslog(LOG_ERR, "unable to create pid file: %m"); + error("Failed to create pid file %s: %m", pidfilename); pidfilename[0] = 0; } +} - /* - * Set process group of device to our process group so we can get - * SIGIOs and SIGHUPs. - */ -#ifdef SETSID - if (default_device) { - int id = tcgetpgrp(fd); - if (id != pgrpid) { - syslog(LOG_WARNING, "warning: not in tty's process group"); - } - } else { - if (tcsetpgrp(fd, pgrpid) < 0) { - syslog(LOG_ERR, "tcsetpgrp(): %m"); - die(1); - } - } -#else - /* set process group on tty so we get SIGIO's */ - if (ioctl(fd, TIOCSPGRP, &pgrpid) < 0) { - syslog(LOG_ERR, "ioctl(TIOCSPGRP): %m"); - die(1); - } -#endif +static void +create_linkpidfile() +{ + FILE *pidfile; - /* - * Record initial device flags, then set device to cause SIGIO - * signals to be generated. - */ - if ((initfdflags = fcntl(fd, F_GETFL)) == -1) { - syslog(LOG_ERR, "fcntl(F_GETFL): %m"); - die(1); - } - if (fcntl(fd, F_SETFL, FNDELAY | FASYNC) == -1) { - syslog(LOG_ERR, "fcntl(F_SETFL, FNDELAY | FASYNC): %m"); - die(1); - } - - /* - * Block all signals, start opening the connection, and wait for - * incoming signals (reply, timeout, etc.). - */ - syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devname); - sigprocmask(SIG_BLOCK, &mask, NULL); /* Block signals now */ - lcp_lowerup(0); /* XXX Well, sort of... */ - lcp_open(0); /* Start protocol */ - for (;;) { - sigpause(0); /* Wait for next signal */ + 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; } } -#if B9600 == 9600 /* - * XXX assume speed_t values numerically equal bits per second - * (so we can ask for any speed). + * holdoff_end - called via a timeout when the holdoff period ends. */ -#define translate_speed(bps) (bps) +static void +holdoff_end(arg) + void *arg; +{ + new_phase(PHASE_DORMANT); +} -#else -/* - * List of valid speeds. - */ -struct speed { - int speed_int, speed_val; -} speeds[] = { -#ifdef B50 - { 50, B50 }, -#endif -#ifdef B75 - { 75, B75 }, -#endif -#ifdef B110 - { 110, B110 }, -#endif -#ifdef B134 - { 134, B134 }, -#endif -#ifdef B150 - { 150, B150 }, -#endif -#ifdef B200 - { 200, B200 }, -#endif -#ifdef B300 - { 300, B300 }, -#endif -#ifdef B600 - { 600, B600 }, -#endif -#ifdef B1200 - { 1200, B1200 }, -#endif -#ifdef B1800 - { 1800, B1800 }, -#endif -#ifdef B2000 - { 2000, B2000 }, -#endif -#ifdef B2400 - { 2400, B2400 }, -#endif -#ifdef B3600 - { 3600, B3600 }, -#endif -#ifdef B4800 - { 4800, B4800 }, -#endif -#ifdef B7200 - { 7200, B7200 }, -#endif -#ifdef B9600 - { 9600, B9600 }, -#endif -#ifdef B19200 - { 19200, B19200 }, -#endif -#ifdef B38400 - { 38400, B38400 }, -#endif -#ifdef EXTA - { 19200, EXTA }, -#endif -#ifdef EXTB - { 38400, EXTB }, -#endif -#ifdef B57600 - { 57600, B57600 }, -#endif -#ifdef B115200 - { 115200, B115200 }, -#endif - { 0, 0 } +/* 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 }, }; /* - * Translate from bits/second to a speed_t. + * protocol_name - find a name for a PPP protocol. */ -int -translate_speed(bps) - int bps; +const char * +protocol_name(proto) + int proto; { - struct speed *speedp; + struct protocol_list *lp; - if (bps == 0) - return 0; - for (speedp = speeds; speedp->speed_int; speedp++) - if (bps == speedp->speed_int) - return speedp->speed_val; - syslog(LOG_WARNING, "speed %d not supported", bps); - return 0; + for (lp = protocol_list; lp->proto != 0; ++lp) + if (proto == lp->proto) + return lp->name; + return NULL; } -#endif /* - * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity, - * at the requested speed, etc. + * get_input - called when incoming data is available. */ -set_up_tty(fd) - int fd; +static void +get_input() { -#ifndef SGTTY - int speed; - struct termios tios; + int len, i; + u_char *p; + u_short protocol; + struct protent *protp; - if (tcgetattr(fd, &tios) < 0) { - syslog(LOG_ERR, "tcgetattr: %m"); - die(1); - } + p = inpacket_buf; /* point to beginning of packet buffer */ - if (!restore_term) - inittermios = tios; - - tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL | CRTSCTS); - tios.c_cflag |= CS8 | CREAD | HUPCL; - if (crtscts) - tios.c_cflag |= CRTSCTS; - if (!modem) - tios.c_cflag |= CLOCAL; - tios.c_iflag = IGNBRK | IGNPAR; - tios.c_oflag = 0; - tios.c_lflag = 0; - tios.c_cc[VMIN] = 1; - tios.c_cc[VTIME] = 0; - speed = translate_speed(inspeed); - if (speed) { - cfsetospeed(&tios, speed); - cfsetispeed(&tios, speed); + 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 (tcsetattr(fd, TCSAFLUSH, &tios) < 0) { - syslog(LOG_ERR, "tcsetattr: %m"); - die(1); + if (debug /*&& (debugflags & DBG_INPACKET)*/) + dbglog("rcvd %P", p, len); + + if (len < PPP_HDRLEN) { + MAINDEBUG(("io(): Received short packet.")); + return; } -#else /* SGTTY */ - int speed; - struct sgttyb sgttyb; + + p += 2; /* Skip address and control */ + GETSHORT(protocol, p); + len -= PPP_HDRLEN; /* - * Put the tty in raw mode. + * Toss all non-LCP packets unless LCP is OPEN. */ - if (ioctl(fd, TIOCGETP, &sgttyb) < 0) { - syslog(LOG_ERR, "ioctl(TIOCGETP): %m"); - die(1); + if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) { + MAINDEBUG(("get_input: Received non-LCP packet when LCP not open.")); + return; } - if (!restore_term) - initsgttyb = sgttyb; + /* + * 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; + } - sgttyb.sg_flags = RAW | ANYP; - speed = translate_speed(inspeed); - if (speed) - sgttyb.sg_ispeed = speed; + /* + * 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 (ioctl(fd, TIOCSETP, &sgttyb) < 0) { - syslog(LOG_ERR, "ioctl(TIOCSETP): %m"); - die(1); + 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); } -#endif - restore_term = TRUE; + lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN); } - /* - * quit - Clean up state and exit. + * new_phase - signal the start of a new phase of pppd's operation. */ -void -quit() +void +new_phase(p) + int p; { - die(0); + phase = p; + if (new_phase_hook) + (*new_phase_hook)(p); } /* - * die - like quit, except we can specify an exit status. + * die - clean up state and exit with the specified status. */ void die(status) int status; { - cleanup(0, NULL); + cleanup(); syslog(LOG_INFO, "Exit."); exit(status); } @@ -642,43 +1328,93 @@ die(status) * cleanup - restore anything which needs to be restored before we exit */ /* ARGSUSED */ -void -cleanup(status, arg) - int status; - caddr_t arg; +static void +cleanup() { - if (fd != 0) { - /* drop dtr to hang up */ - if (modem) - setdtr(fd, FALSE); + sys_cleanup(); - if (fcntl(fd, F_SETFL, initfdflags) < 0) - syslog(LOG_ERR, "fcntl(F_SETFL, fdflags): %m"); + if (fd_ppp >= 0) + disestablish_ppp(ttyfd); + if (real_ttyfd >= 0) + close_tty(); - disestablish_ppp(); + 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 (restore_term) { -#ifndef SGTTY - if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0) - syslog(LOG_ERR, "tcsetattr: %m"); -#else - if (ioctl(fd, TIOCSETP, &initsgttyb) < 0) - syslog(LOG_ERR, "ioctl(TIOCSETP): %m"); -#endif - } + if (locked) + unlock(); + + if (pppdb != NULL) + cleanup_db(); +} + +/* + * 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); + } - close(fd); - fd = 0; + 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); + } } - if (pidfilename[0] != 0 && unlink(pidfilename) < 0) - syslog(LOG_WARNING, "unable to unlink pid file: %m"); - pidfilename[0] = 0; + 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]; -static struct callout *callout = NULL; /* Callout list */ -static struct timeval schedtime; /* Time last timeout was set */ + 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. @@ -688,59 +1424,35 @@ static struct timeval schedtime; /* Time last timeout was set */ */ void timeout(func, arg, time) - void (*func)(); - caddr_t arg; + void (*func) __P((void *)); + void *arg; int time; { - struct itimerval itv; - struct callout *newp, **oldpp; + struct callout *newp, *p, **pp; - MAINDEBUG((LOG_DEBUG, "Timeout %x:%x in %d seconds.", - (int) func, (int) arg, time)); + MAINDEBUG(("Timeout %p:%p in %d seconds.", func, arg, time)); /* * Allocate timeout. */ - if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) { - syslog(LOG_ERR, "Out of memory in timeout()!"); - die(1); - } + 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 to link it in and decrement its time by the - * amount of time used by preceding timeouts. - */ - for (oldpp = &callout; - *oldpp && (*oldpp)->c_time <= time; - oldpp = &(*oldpp)->c_next) - time -= (*oldpp)->c_time; - newp->c_time = time; - newp->c_next = *oldpp; - if (*oldpp) - (*oldpp)->c_time -= time; - *oldpp = newp; - - /* - * If this is now the first callout then we have to set a new - * itimer. + * Find correct place and link it in. */ - if (callout == newp) { - itv.it_interval.tv_sec = itv.it_interval.tv_usec = - itv.it_value.tv_usec = 0; - itv.it_value.tv_sec = callout->c_time; - MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds.", - itv.it_value.tv_sec)); - if (setitimer(ITIMER_REAL, &itv, NULL)) { - syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m"); - die(1); - } - if (gettimeofday(&schedtime, NULL)) { - syslog(LOG_ERR, "gettimeofday: %m"); - die(1); - } - } + 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; } @@ -749,84 +1461,89 @@ timeout(func, arg, time) */ void untimeout(func, arg) - void (*func)(); - caddr_t arg; + void (*func) __P((void *)); + void *arg; { - struct itimerval itv; struct callout **copp, *freep; - int reschedule = 0; - MAINDEBUG((LOG_DEBUG, "Untimeout %x:%x.", (int) func, (int) arg)); + MAINDEBUG(("Untimeout %p:%p.", func, arg)); /* - * If the first callout is unscheduled then we have to set a new - * itimer. + * Find first matching timeout and remove it from the list. */ - if (callout && - callout->c_func == func && - callout->c_arg == arg) - reschedule = 1; - - /* - * Find first matching timeout. Add its time to the next timeouts - * time. - */ - for (copp = &callout; *copp; copp = &(*copp)->c_next) - if ((*copp)->c_func == func && - (*copp)->c_arg == arg) { - freep = *copp; + for (copp = &callout; (freep = *copp); copp = &freep->c_next) + if (freep->c_func == func && freep->c_arg == arg) { *copp = freep->c_next; - if (*copp) - (*copp)->c_time += freep->c_time; - (void) free((char *) freep); + free((char *) freep); break; } - - if (reschedule) { - itv.it_interval.tv_sec = itv.it_interval.tv_usec = - itv.it_value.tv_usec = 0; - itv.it_value.tv_sec = callout ? callout->c_time : 0; - MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds.", - itv.it_value.tv_sec)); - if (setitimer(ITIMER_REAL, &itv, NULL)) { - syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m"); - die(1); - } - if (gettimeofday(&schedtime, NULL)) { - syslog(LOG_ERR, "gettimeofday: %m"); - die(1); - } +} + + +/* + * 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; } /* - * adjtimeout - Decrement the first timeout by the amount of time since - * it was scheduled. + * kill_my_pg - send a signal to our process group, and ignore it ourselves. */ -void -adjtimeout() +static void +kill_my_pg(sig) + int sig; { - struct timeval tv; - int timediff; - - if (callout == NULL) - return; - /* - * Make sure that the clock hasn't been warped dramatically. - * Account for recently expired, but blocked timer by adding - * small fudge factor. - */ - if (gettimeofday(&tv, NULL)) { - syslog(LOG_ERR, "gettimeofday: %m"); - die(1); - } - timediff = tv.tv_sec - schedtime.tv_sec; - if (timediff < 0 || - timediff > callout->c_time + 1) - return; - - callout->c_time -= timediff; /* OK, Adjust time */ + struct sigaction act, oldact; + + act.sa_handler = SIG_IGN; + act.sa_flags = 0; + kill(0, sig); + sigaction(sig, &act, &oldact); + sigaction(sig, &oldact, NULL); } @@ -834,405 +1551,945 @@ adjtimeout() * 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. */ -/*ARGSUSED*/ static void -hup(sig, code, scp, addr) - int sig, code; - struct sigcontext *scp; - char *addr; +hup(sig) + int sig; { - syslog(LOG_INFO, "Hangup (SIGHUP)"); - - hungup = 1; /* they hung up on us! */ - persist = 0; /* don't try to restart */ - adjtimeout(); /* Adjust timeouts */ - lcp_lowerdown(0); /* Reset connection */ - quit(); /* and die */ + 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. + * term - Catch SIGTERM signal and SIGINT signal (^C/del). * * Indicates that we should initiate a graceful disconnect and exit. */ /*ARGSUSED*/ static void -term(sig, code, scp, addr) - int sig, code; - struct sigcontext *scp; - char *addr; +term(sig) + int sig; { - syslog(LOG_INFO, "Terminating link."); + info("Terminating on signal %d.", sig); persist = 0; /* don't try to restart */ - adjtimeout(); /* Adjust timeouts */ - lcp_close(0); /* Close connection */ + 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); } /* - * intr - Catch SIGINT signal (DEL/^C). - * - * Indicates that we should initiate a graceful disconnect and exit. + * chld - Catch SIGCHLD signal. + * Sets a flag so we will call reap_kids in the mainline. */ -/*ARGSUSED*/ static void -intr(sig, code, scp, addr) - int sig, code; - struct sigcontext *scp; - char *addr; +chld(sig) + int sig; { - syslog(LOG_INFO, "Interrupt received: terminating link"); - persist = 0; /* don't try to restart */ - adjtimeout(); /* Adjust timeouts */ - lcp_close(0); /* Close connection */ + got_sigchld = 1; + if (waiting) + siglongjmp(sigjmp, 1); } /* - * alrm - Catch SIGALRM signal. + * toggle_debug - Catch SIGUSR1 signal. * - * Indicates a timeout. + * Toggle debug flag. */ /*ARGSUSED*/ static void -alrm(sig, code, scp, addr) - int sig, code; - struct sigcontext *scp; - char *addr; +toggle_debug(sig) + int sig; { - struct itimerval itv; - struct callout *freep; - - MAINDEBUG((LOG_DEBUG, "Alarm")); - - /* - * Call and free first scheduled timeout and any that were scheduled - * for the same time. - */ - while (callout) { - freep = callout; /* Remove entry before calling */ - callout = freep->c_next; - (*freep->c_func)(freep->c_arg); - (void) free((char *) freep); - if (callout && callout->c_time) - break; - } - - /* - * Set a new itimer if there are more timeouts scheduled. - */ - if (callout) { - itv.it_interval.tv_sec = itv.it_interval.tv_usec = 0; - itv.it_value.tv_usec = 0; - itv.it_value.tv_sec = callout->c_time; - MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds.", - itv.it_value.tv_sec)); - if (setitimer(ITIMER_REAL, &itv, NULL)) { - syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m"); - die(1); - } - if (gettimeofday(&schedtime, NULL)) { - syslog(LOG_ERR, "gettimeofday: %m"); - die(1); - } + debug = !debug; + if (debug) { + setlogmask(LOG_UPTO(LOG_DEBUG)); + } else { + setlogmask(LOG_UPTO(LOG_WARNING)); } } /* - * io - Catch SIGIO signal. + * open_ccp - Catch SIGUSR2 signal. * - * Indicates that incoming data is available. + * Try to (re)negotiate compression. */ /*ARGSUSED*/ static void -io(sig, code, scp, addr) - int sig, code; - struct sigcontext *scp; - char *addr; +open_ccp(sig) + int sig; { - int len, i; - u_char *p; - u_short protocol; - fd_set fdset; - struct timeval notime; - int ready; - - MAINDEBUG((LOG_DEBUG, "IO signal received")); - adjtimeout(); /* Adjust timeouts */ - - /* we do this to see if the SIGIO handler is being invoked for input */ - /* ready, or for the socket buffer hitting the low-water mark. */ + open_ccp_flag = 1; + if (waiting) + siglongjmp(sigjmp, 1); +} - notime.tv_sec = 0; - notime.tv_usec = 0; - FD_ZERO(&fdset); - FD_SET(fd, &fdset); - - if ((ready = select(32, &fdset, (fd_set *) NULL, (fd_set *) NULL, - ¬ime)) == -1) { - syslog(LOG_ERR, "Error in io() select: %m"); - die(1); - } - - if (ready == 0) { - MAINDEBUG((LOG_DEBUG, "IO non-input ready SIGIO occured.")); - return; - } - /* Yup, this is for real */ - for (;;) { /* Read all available packets */ - p = inpacket_buf; /* point to beginning of packet buffer */ +/* + * 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); +} - len = read_packet(inpacket_buf); - if (len < 0) - return; - if (len == 0) { - syslog(LOG_ERR, "End of file on fd!"); - die(1); - } +/* + * 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; - if (len < DLLHEADERLEN) { - MAINDEBUG((LOG_INFO, "io(): Received short packet.")); - return; - } + ++conn_running; + pid = fork(); - p += 2; /* Skip address and control */ - GETSHORT(protocol, p); - len -= DLLHEADERLEN; + if (pid < 0) { + --conn_running; + error("Failed to create child process: %m"); + return -1; + } - /* - * Toss all non-LCP packets unless LCP is OPEN. - */ - if (protocol != LCP && lcp_fsm[0].state != OPENED) { - MAINDEBUG((LOG_INFO, - "io(): Received non-LCP packet when LCP not open.")); - if (debug) - dumpbuffer(inpacket_buf, len + DLLHEADERLEN, LOG_INFO); - return; + 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); } - - /* - * Upcall the proper protocol input routine. - */ - for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++) - if (prottbl[i].protocol == protocol) { - (*prottbl[i].input)(0, p, len); - break; + 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 (i == sizeof (prottbl) / sizeof (struct protent)) { - syslog(LOG_WARNING, "input: Unknown protocol (%x) received!", - protocol); - lcp_sprotrej(0, p - DLLHEADERLEN, len + DLLHEADERLEN); + 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); } + /* - * demuxprotrej - Demultiplex a Protocol-Reject. + * 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. */ -void -demuxprotrej(unit, protocol) - int unit; - u_short protocol; +pid_t +run_program(prog, args, must_exist, done, arg) + char *prog; + char **args; + int must_exist; + void (*done) __P((void *)); + void *arg; { - int i; + int pid; + struct stat sbuf; /* - * Upcall the proper Protocol-Reject routine. + * 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. */ - for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++) - if (prottbl[i].protocol == protocol) { - (*prottbl[i].protrej)(unit); - return; + 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); + } - syslog(LOG_WARNING, - "demuxprotrej: Unrecognized Protocol-Reject for protocol %d!", - protocol); + if (debug) + dbglog("Script %s started (pid %d)", prog, pid); + record_child(pid, prog, done, arg); + + return pid; } /* - * incdebug - Catch SIGUSR1 signal. - * - * Increment debug flag. + * record_child - add a child process to the list for reap_kids + * to use. */ -/*ARGSUSED*/ static void -incdebug(sig) - int sig; +record_child(pid, prog, done, arg) + int pid; + char *prog; + void (*done) __P((void *)); + void *arg; { - syslog(LOG_INFO, "Debug turned ON, Level %d", debug); - setlogmask(LOG_UPTO(LOG_DEBUG)); - debug++; + 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; + } } /* - * nodebug - Catch SIGUSR2 signal. - * - * Turn off debugging. + * reap_kids - get status from any dead child processes, + * and log a message for abnormal terminations. */ -/*ARGSUSED*/ -static void -nodebug(sig) - int sig; +static int +reap_kids(waitfor) + int waitfor; { - setlogmask(LOG_UPTO(LOG_WARNING)); - debug = 0; + 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) { + 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; } /* - * set_up_connection - run a program to initialize the serial connector + * novm - log an error message saying we ran out of memory, and die. */ -int -set_up_connection(program, in, out) - char *program; - int in, out; +void +novm(msg) + char *msg; { - int pid; - int status; - sigset_t mask; + fatal("Virtual memory exhausted allocating %s\n", msg); +} - sigemptyset(&mask); - sigaddset(&mask, SIGINT); - sigaddset(&mask, SIGHUP); - sigprocmask(SIG_BLOCK, &mask, &mask); +/* + * 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; - pid = fork(); - - if (pid < 0) { - syslog(LOG_ERR, "fork: %m"); - die(1); + 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; } - - if (pid == 0) { - setreuid(getuid(), getuid()); - setregid(getgid(), getgid()); - sigprocmask(SIG_SETMASK, &mask, NULL); - dup2(in, 0); - dup2(out, 1); - execl("/bin/sh", "sh", "-c", program, (char *)0); - syslog(LOG_ERR, "could not exec /bin/sh: %m"); - _exit(99); - /* NOTREACHED */ + + /* 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; } - while (waitpid(pid, &status, 0) != pid) { - if (errno == EINTR) - continue; - syslog(LOG_ERR, "waiting for connection process: %m"); - die(1); + script_env[i] = newstring; + script_env[i+1] = 0; + + if (pppdb != NULL) { + if (iskey) + add_db_key(newstring); + update_db_entry(); } - sigprocmask(SIG_SETMASK, &mask, NULL); +} - return (status == 0 ? 0 : -1); +/* + * 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)); + +} /* - * Return user specified netmask. A value of zero means no netmask has - * been set. + * add_db_key - add a key that we can use to look up our database entry. */ -/* ARGSUSED */ -u_long -GetMask(addr) - u_long addr; +static void +add_db_key(str) + const char *str; { - return(netmask); + 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)); } /* - * dumpbuffer - print contents of a buffer in hex to standard output. + * delete_db_key - delete a key for looking up our database entry. */ -void -dumpbuffer(buffer, size, level) - unsigned char *buffer; - int size; - int level; +static void +delete_db_key(str) + const char *str; { - register int i; - char line[256], *p; - - printf("%d bytes:\n", size); - while (size > 0) - { - p = line; - sprintf(p, "%08lx: ", buffer); - p += 10; - - for (i = 0; i < 8; i++, p += 3) - if (size - i <= 0) - sprintf(p, "xx "); - else - sprintf(p, "%02x ", buffer[i]); + TDB_DATA key; - for (i = 0; i < 8; i++) - if (size - i <= 0) - *p++ = 'x'; - else - *p++ = (' ' <= buffer[i] && buffer[i] <= '~') ? - buffer[i] : '.'; + 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; - *p++ = 0; - buffer += 8; - size -= 8; + 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); +} + +/* + * open_socket - establish a stream socket connection to the nominated + * host and port. + */ +static int +open_socket(dest) + char *dest; +{ + char *sep, *endp = NULL; + int sock, port = -1; + u_int32_t host; + struct hostent *hent; + struct sockaddr_in sad; + + /* parse host:port and resolve host to an IP address */ + sep = strchr(dest, ':'); + if (sep != NULL) + port = strtol(sep+1, &endp, 10); + if (port < 0 || endp == sep+1 || sep == dest) { + error("Can't parse host:port for socket destination"); + return -1; + } + *sep = 0; + host = inet_addr(dest); + if (host == (u_int32_t) -1) { + hent = gethostbyname(dest); + if (hent == NULL) { + error("%s: unknown host in socket option", dest); + *sep = ':'; + return -1; + } + host = *(u_int32_t *)(hent->h_addr_list[0]); + } + *sep = ':'; -/* syslog(level, "%s\n", line); */ - printf("%s\n", line); - fflush(stdout); + /* get a socket and connect it to the other end */ + sock = socket(PF_INET, SOCK_STREAM, 0); + if (sock < 0) { + error("Can't create socket: %m"); + return -1; + } + memset(&sad, 0, sizeof(sad)); + sad.sin_family = AF_INET; + sad.sin_port = htons(port); + sad.sin_addr.s_addr = host; + if (connect(sock, (struct sockaddr *)&sad, sizeof(sad)) < 0) { + error("Can't connect to %s: %m", dest); + close(sock); + return -1; } -} + return sock; +} /* - * setdtr - control the DTR line on the serial port. - * This is called from die(), so it shouldn't call die(). + * start_charshunt - create a child process to run the character shunt. */ -setdtr(fd, on) -int fd, on; +static int +start_charshunt(ifd, ofd) + int ifd, ofd; { - int modembits = TIOCM_DTR; + int cpid; - ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits); + 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; } -#include - -char line[256]; -char *p; +static void +charshunt_done(arg) + void *arg; +{ + charshunt_pid = 0; +} -logf(level, fmt, va_alist) -int level; -char *fmt; -va_dcl +/* + * 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; { - va_list pvar; - char buf[256]; + 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; + int ilevel, olevel, max_level; + struct timeval levelt, tout, *top; + + /* + * 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); + } - va_start(pvar); - vsprintf(buf, fmt, pvar); - va_end(pvar); + /* 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"); + } - p = line + strlen(line); - strcat(p, buf); + nibuf = nobuf = 0; + ibufp = obufp = NULL; + pty_readable = stdin_readable = 1; + + ilevel = olevel = 0; + gettimeofday(&levelt, NULL); + if (max_data_rate) { + max_level = max_data_rate / 10; + if (max_level < 100) + max_level = 100; + } else + max_level = sizeof(inpacket_buf) + 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; + } - if (buf[strlen(buf)-1] == '\n') { - syslog(level, "%s", line); - line[0] = 0; + while (nibuf != 0 || nobuf != 0 || pty_readable || stdin_readable) { + top = 0; + tout.tv_sec = 0; + tout.tv_usec = 10000; + FD_ZERO(&ready); + FD_ZERO(&writey); + if (nibuf != 0) { + if (ilevel >= max_level) + top = &tout; + else + FD_SET(pty_master, &writey); + } else if (stdin_readable) + FD_SET(ifd, &ready); + if (nobuf != 0) { + if (olevel >= max_level) + top = &tout; + else + FD_SET(ofd, &writey); + } else if (pty_readable) + FD_SET(pty_master, &ready); + if (select(nfds, &ready, &writey, NULL, top) < 0) { + if (errno != EINTR) + fatal("select"); + continue; + } + if (max_data_rate) { + double dt; + int nbt; + struct timeval now; + + gettimeofday(&now, NULL); + dt = (now.tv_sec - levelt.tv_sec + + (now.tv_usec - levelt.tv_usec) / 1e6); + nbt = (int)(dt * max_data_rate); + ilevel = (nbt < 0 || nbt > ilevel)? 0: ilevel - nbt; + olevel = (nbt < 0 || nbt > olevel)? 0: olevel - nbt; + levelt = now; + } else + ilevel = olevel = 0; + 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 = nobuf; + if (olevel + n > max_level) + n = max_level - olevel; + n = write(ofd, obufp, n); + if (n < 0) { + if (errno == EIO) { + pty_readable = 0; + nobuf = 0; + } else if (errno != EAGAIN && errno != EINTR) { + error("Error writing standard output: %m"); + break; + } + } else { + obufp += n; + nobuf -= n; + olevel += n; + } + } + if (FD_ISSET(pty_master, &writey)) { + n = nibuf; + if (ilevel + n > max_level) + n = max_level - ilevel; + n = write(pty_master, ibufp, n); + if (n < 0) { + if (errno == EIO) { + stdin_readable = 0; + nibuf = 0; + } else if (errno != EAGAIN && errno != EINTR) { + error("Error writing pseudo-tty master: %m"); + break; + } + } else { + ibufp += n; + nibuf -= n; + ilevel += n; + } + } } + exit(0); } -void -novm(msg) - char *msg; +static int +record_write(f, code, buf, nb, tp) + FILE *f; + int code; + u_char *buf; + int nb; + struct timeval *tp; { - syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg); - die(1); + 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; }