/* * main.c - Point-to-Point Protocol main module * * Copyright 2000-2002 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. * * Permission to use, copy, modify, and distribute this software and its * documentation is hereby granted, provided that the above copyright * notice appears in all copies. * * SUN MAKES NO REPRESENTATION OR WARRANTIES ABOUT THE SUITABILITY OF * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES * * 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. */ #pragma ident "%Z%%M% %I% %E% SMI" #define RCSID "$Id: main.c,v 1.97 2000/04/24 02:54:16 masputra Exp $" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pppd.h" #include "magic.h" #include "fsm.h" #include "lcp.h" #include "ipcp.h" #ifdef INET6 #include "ipv6cp.h" #endif #include "upap.h" #include "chap.h" #include "ccp.h" #include "pathnames.h" #include "patchlevel.h" #ifdef HAVE_MULTILINK #include "tdb.h" #endif #ifdef CBCP_SUPPORT #include "cbcp.h" #endif #ifdef IPX_CHANGE #include "ipxcp.h" #endif /* IPX_CHANGE */ #ifdef AT_CHANGE #include "atcp.h" #endif #if !defined(lint) && !defined(_lint) static const char rcsid[] = RCSID; #endif /* interface vars */ char ifname[32]; /* Interface name */ int ifunit = -1; /* Interface unit number */ char *progname; /* Name of this program */ char hostname[MAXHOSTNAMELEN+1]; /* 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) */ 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 */ bool hungup; /* terminal has been hung up */ bool privileged; /* we're running as real uid root */ bool need_holdoff; /* need holdoff period before restarting */ bool detached; /* have detached from terminal */ struct stat devstat; /* result of stat() on devnam */ bool 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 */ #ifdef HAVE_MULTILINK TDB_CONTEXT *pppdb; /* database for storing status etc. */ char db_key[32]; #endif /* * For plug-in usage: * * holdoff_hook - Can be used to change the demand-dial hold-off * time dynamically. This is normally set by the * "holdoff" option, and is 30 seconds by default. * * new_phase_hook - This is called for each change in the PPP * phase (per RFC 1661). This can be used to log * progress. * * check_options_hook - This is called before doing sys_init() * and allows the plugin to verify the selected options. * * updown_script_hook - This is called with the proposed * command-line arguments for any of the * /etc/ppp/{ip,ipv6,ipx,auth}-{up,down} scripts before * fork/exec. It can be used to add or change arguments. * * device_pipe_hook - If this is set, then an extra fd (3) is * passed to the connect/disconnect script. This extra * fd is the write side of a pipe, and the read side is * passed to this routine. This can be used to pass * arbitrary data from the script back to pppd. */ int (*holdoff_hook) __P((void)) = NULL; int (*new_phase_hook) __P((int new, int old)) = NULL; int (*check_options_hook) __P((uid_t uid)) = NULL; int (*updown_script_hook) __P((const char ***argsp)) = NULL; void (*device_pipe_hook) __P((int pipefd)) = NULL; static int fd_ppp = -1; /* fd for talking PPP */ static int fd_loop; /* fd for getting demand-dial packets */ static int pty_master; /* fd for master side of pty */ int pty_slave = -1; /* fd for slave side of pty */ static int real_ttyfd; /* fd for actual serial port (not pty) */ int phase; /* where the link is at */ int kill_link; int open_ccp_flag; static int waiting; /* for input from peer or timer expiration */ 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 */ u_char nak_buffer[PPP_MRU]; /* where we construct a nak packet */ static int n_children; /* # child processes still running */ static bool got_sigchld; /* set if we have received a SIGCHLD */ static sigset_t main_sigmask; /* signals blocked while dispatching */ static bool locked; /* lock() has succeeded */ static bool 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; bool link_stats_valid; static pid_t charshunt_pid; /* Process ID for charshunt */ extern option_t general_options[]; extern option_t auth_options[]; /* * 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 *, int)); 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, char *)); static int reap_kids __P((int waitfor)); static void record_child __P((pid_t, char *, void (*) (void *, int), void *)); static int open_socket __P((char *)); static int start_charshunt __P((int, int)); static void charshunt_done __P((void *, int)); static void charshunt __P((int, int, char *)); static int record_write __P((FILE *, int code, u_char *buf, int nb, struct timeval *)); static void final_reap __P((void)); #ifdef HAVE_MULTILINK 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)); #endif int main __P((int, char *[])); #ifdef ultrix #undef O_NONBLOCK #define O_NONBLOCK O_NDELAY #endif #ifdef ULTRIX #define setlogmask(x) 0 #endif /* Backward compatibility for Linux */ #ifndef RECMARK_TIMESTART #define RECMARK_STARTSEND 1 #define RECMARK_STARTRECV 2 #define RECMARK_ENDSEND 3 #define RECMARK_ENDRECV 4 #define RECMARK_TIMEDELTA32 5 #define RECMARK_TIMEDELTA8 6 #define RECMARK_TIMESTART 7 #endif /* * PPP Data Link Layer "protocol" table. * One entry per supported protocol. * The last entry must be NULL. */ struct protent *protocols[] = { &lcp_protent, &pap_protent, &chap_protent, #ifdef CBCP_SUPPORT &cbcp_protent, #endif &ipcp_protent, #ifdef INET6 &ipv6cp_protent, #endif &ccp_protent, #ifdef IPX_CHANGE &ipxcp_protent, #endif #ifdef AT_CHANGE &atcp_protent, #endif NULL }; int main(argc, argv) int argc; char *argv[]; { int i, fdflags, t; char *p, *connector; struct passwd *pw; struct timeval timo; struct protent *protp; struct stat statbuf; char numbuf[16]; ifname[0] = '\0'; 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(_PATH_DEVNULL, O_RDWR)) >= 0) { while (0 <= i && i <= 2) i = dup(i); if (i >= 0) (void) close(i); } script_env = NULL; /* Initialize syslog facilities */ reopen_log(); if (gethostname(hostname, MAXHOSTNAMELEN+1) < 0 ) { option_error("Couldn't get hostname: %m"); exit(1); } hostname[MAXHOSTNAMELEN] = '\0'; /* make sure we don't create world or group writable files. */ (void) umask(umask(0777) | 022); uid = getuid(); privileged = (uid == 0); (void) 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(); progname = *argv; prepass = 0; /* * Initialize to the standard option set, then parse, in order, the * system options file, the user's options file, the tty's options file, * and the command line arguments. At last, install the options declared * by each protocol into the extra_option list. */ for (i = 0; (protp = protocols[i]) != NULL; ++i) { (*protp->init)(0); if (protp->options != NULL) { add_options(protp->options); } } /* * Install "generic" options into the extra_options list. */ add_options(auth_options); add_options(general_options); /* Install any system-specific options (or remove unusable ones) */ sys_options(); if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1) || !options_from_user()) exit(EXIT_OPTION_ERROR); /* scan command line and options files to find device name */ prepass = 1; (void) parse_args(argc-1, argv+1); prepass = 0; /* * Work out the device name, if it hasn't already been specified. */ using_pty = notty || ptycommand != NULL || pty_socket != NULL; if (!using_pty && default_device && !direct_tty) { char *p; if (!isatty(0) || (p = ttyname(0)) == NULL) { option_error("no device specified and stdin is not a tty"); exit(EXIT_OPTION_ERROR); } (void) 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 && !direct_tty) { 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->enabled_flag && protp->check_options != NULL) (*protp->check_options)(); if (demand && (connect_script == NULL)) { option_error("connect script is required for demand-dialling\n"); exit(EXIT_OPTION_ERROR); } if (updetach && (nodetach || demand)) { option_error("updetach cannot be used with %s", nodetach ? "nodetach" : "demand"); exit(EXIT_OPTION_ERROR); } /* default holdoff to 0 if no connect script has been given */ if ((connect_script == NULL) && !holdoff_specified) holdoff = 0; if (using_pty || direct_tty) { if (!default_device) { option_error("%s option precludes specifying device name", notty? "notty": "pty"); exit(EXIT_OPTION_ERROR); } if (ptycommand != NULL && (notty || direct_tty)) { option_error("pty option is incompatible with notty option"); exit(EXIT_OPTION_ERROR); } if (pty_socket != NULL && (ptycommand != NULL || notty || direct_tty)) { option_error("socket option is incompatible with pty and notty"); exit(EXIT_OPTION_ERROR); } default_device = notty || direct_tty; lockflag = 0; modem = 0; if (default_device && log_to_fd <= 1) log_to_fd = -1; } else { /* * If the user has specified a device which is the same as * the one on stdin, pretend they didn't specify any. * If the device is already open read/write on stdin, * we assume we don't need to lock it, and we can open it as root. */ if (fstat(0, &statbuf) >= 0 && S_ISCHR(statbuf.st_mode) && statbuf.st_rdev == devstat.st_rdev) { default_device = 1; fdflags = fcntl(0, F_GETFL); if (fdflags != -1 && (fdflags & O_ACCMODE) == O_RDWR) privopen = 1; } } if (default_device) nodetach = 1; /* * Don't send log messages to the serial port, it tends to * confuse the peer. :-) */ if (log_to_fd >= 0 && fstat(log_to_fd, &statbuf) >= 0 && S_ISCHR(statbuf.st_mode) && statbuf.st_rdev == devstat.st_rdev) log_to_fd = -1; early_log = 0; if (debug) (void) setlogmask(LOG_UPTO(LOG_DEBUG)); /* * Initialize system-dependent stuff. */ if (check_options_hook != NULL && (*check_options_hook)(uid) == -1) { exit(EXIT_OPTION_ERROR); } sys_init(!devnam_info.priv && !privopen); #ifdef HAVE_MULTILINK pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644); if (pppdb != NULL) { (void) 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; } } #endif /* * Detach ourselves from the terminal, if required, and identify * who is running us. Printing to stderr stops here unless * nodetach or updetach is set. */ 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] != '\0') script_setenv("DEVICE", devnam, 1); (void) 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. */ #ifdef HAVE_MULTILINK (void) tdb_writelock(pppdb); #endif set_ifunit(1); fd_loop = open_ppp_loopback(); #ifdef HAVE_MULTILINK (void) tdb_writeunlock(pppdb); #endif /* * Configure the interface and mark it up, etc. */ demand_conf(); } new_phase(PHASE_INITIALIZED); 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) { (void) sigprocmask(SIG_BLOCK, &main_sigmask, NULL); if (kill_link || got_sigchld) { (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL); } else { waiting = 1; (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, 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) (void) reap_kids(0); } remove_fd(fd_loop); if (kill_link && !persist) break; /* * Now we want to bring up the link. */ demand_block(); info("Starting link"); } new_phase(doing_callback ? PHASE_CALLINGBACK : PHASE_SERIALCONN); /* * Get a pty master/slave pair if the pty, notty, socket, * or record options were specified. */ (void) 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; } set_up_tty(pty_slave, 1); } /* * Lock the device if we've been asked to. */ status = EXIT_LOCK_FAILED; if (lockflag && !privopen && !direct_tty) { 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 (direct_tty) { ttyfd = 0; } else 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) (void) seteuid(uid); if ((ttyfd = sys_extra_fd()) < 0) ttyfd = open(devnam, O_NONBLOCK | O_RDWR); err = errno; if (!devnam_info.priv && !privopen) (void) seteuid(0); if (ttyfd >= 0) break; errno = err; if (err != EINTR) { error("Failed to open %s: %m", devnam); status = EXIT_OPEN_FAILED; } if (!persist || err != EINTR) goto fail; } if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0) warn("Couldn't reset non-blocking mode on device: %m"); /* * Do the equivalent of `mesg n' to stop broadcast messages. */ if (fstat(ttyfd, &statbuf) < 0 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) { warn("Couldn't restrict write permissions to %s: %m", devnam); } else tty_mode = statbuf.st_mode; /* * Set line speed, flow control, etc. * If we have a non-null connection or initializer script, * on most systems we set CLOCAL for now so that we can talk * to the modem before carrier comes up. But this has the * side effect that we might miss it if CD drops before we * get to clear CLOCAL below. On systems where we can talk * successfully to the modem with CLOCAL clear and CD down, * we could clear CLOCAL at this point. */ set_up_tty(ttyfd, ((connector != NULL && connector[0] != '\0') || initializer != NULL)); real_ttyfd = ttyfd; } /* * If the 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"); dbglog("starting charshunt for pty option"); ok = device_script(ptycommand, opipe[0], ipipe[1], 1, "record") == 0 && start_charshunt(ipipe[0], opipe[1]); (void) close(ipipe[0]); (void) close(ipipe[1]); (void) close(opipe[0]); (void) close(opipe[1]); if (!ok) goto fail; } else { if (device_script(ptycommand, pty_master, pty_master, 1, "pty") < 0) goto fail; ttyfd = pty_slave; (void) close(pty_master); pty_master = -1; } } else if (pty_socket != NULL) { int fd = open_socket(pty_socket); if (fd < 0) goto fail; dbglog("starting charshunt for socket option"); if (!start_charshunt(fd, fd)) goto fail; } else if (notty) { dbglog("starting charshunt for notty option"); if (!start_charshunt(0, 1)) goto fail; } else if (record_file != NULL) { dbglog("starting charshunt for record option"); if (!start_charshunt(ttyfd, ttyfd)) goto fail; } /* run connection script */ if (((connector != NULL) && (connector[0] != '\0')) || initializer) { if (real_ttyfd != -1) { /* XXX do this if doing_callback == CALLBACK_DIALIN? */ if (!default_device && modem && !direct_tty) { setdtr(real_ttyfd, 0); /* in case modem is off hook */ (void) sleep(1); setdtr(real_ttyfd, 1); } } if ((initializer != NULL) && (initializer[0] != '\0')) { if (device_script(initializer, ttyfd, ttyfd, 0, "init") < 0) { error("Initializer script failed"); status = EXIT_INIT_FAILED; goto fail; } if (kill_link) goto disconnect; info("Serial port initialized."); } if ((connector != NULL) && (connector[0] != '\0')) { if (device_script(connector, ttyfd, ttyfd, 0, "connect") < 0) { error("Connect script failed"); status = EXIT_CONNECT_FAILED; goto fail; } if (kill_link) goto disconnect; info("Serial connection established."); } /* * Clear CLOCAL if modem option -- we now have carrier * established, and we should respect loss of carrier. */ if (real_ttyfd != -1) set_up_tty(real_ttyfd, 0); if (doing_callback == CALLBACK_DIALIN) connector = NULL; } /* reopen tty if necessary to wait for carrier */ if (connector == NULL && modem && devnam[0] != '\0' && !direct_tty) { 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; } (void) close(i); } (void) slprintf(numbuf, sizeof(numbuf), "%d", baud_rate); script_setenv("SPEED", numbuf, 0); /* run welcome script, if any */ if ((welcomer != NULL) && (welcomer[0] != '\0')) { if (device_script(welcomer, ttyfd, ttyfd, 0, "welcome") < 0) warn("Welcome script failed"); } /* set up the serial device as a ppp interface */ #ifdef HAVE_MULTILINK (void) tdb_writelock(pppdb); #endif fd_ppp = establish_ppp(ttyfd); if (fd_ppp < 0) { #ifdef HAVE_MULTILINK (void) tdb_writeunlock(pppdb); #endif status = EXIT_FATAL_ERROR; goto disconnect; } if (!demand && ifunit >= 0) set_ifunit(1); #ifdef HAVE_MULTILINK (void) tdb_writeunlock(pppdb); #endif /* * Start opening the connection and wait for * incoming events (reply, timeout, etc.). */ notice("Connect: %s <--> %s", ifname, ppp_devnam); (void) gettimeofday(&start_time, NULL); link_stats_valid = 0; script_unsetenv("CONNECT_TIME"); script_unsetenv("BYTES_SENT"); script_unsetenv("BYTES_RCVD"); lcp_lowerup(0); /* Mostly for accounting purposes */ new_phase(PHASE_CONNECTED); /* * 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) { (void) sigprocmask(SIG_BLOCK, &main_sigmask, NULL); if (kill_link || open_ccp_flag || got_sigchld) { (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL); } else { waiting = 1; (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, 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) { /* Uncloak ourselves. */ ccp_fsm[0].flags &= ~OPT_SILENT; (*ccp_protent.open)(0); } open_ccp_flag = 0; } if (got_sigchld) (void) 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 %" PPP_COUNTER_F " bytes (%" PPP_COUNTER_F " packets), received %" PPP_COUNTER_F " bytes (%" PPP_COUNTER_F " packets).", link_stats.bytes_out, link_stats.pkts_out, link_stats.bytes_in, link_stats.pkts_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 != NULL) && (disconnect_script[0] != '\0') && !hungup) { new_phase(PHASE_DISCONNECT); if (real_ttyfd >= 0) set_up_tty(real_ttyfd, 1); if (device_script(disconnect_script, ttyfd, ttyfd, 0, "disconnect") < 0) { warn("disconnect script failed"); } else { info("Serial link disconnected."); } } fail: if (pty_master >= 0) (void) close(pty_master); if (pty_slave >= 0) { (void) close(pty_slave); pty_slave = -1; } if (real_ttyfd >= 0) close_tty(); if (locked) { locked = 0; unlock(); } 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 != NULL) t = (*holdoff_hook)(); if (t > 0) { new_phase(PHASE_HOLDOFF); TIMEOUT(holdoff_end, NULL, t); do { if (sigsetjmp(sigjmp, 1) == 0) { (void) sigprocmask(SIG_BLOCK, &main_sigmask, NULL); if (kill_link || got_sigchld) { (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, NULL); } else { waiting = 1; (void) sigprocmask(SIG_UNBLOCK, &main_sigmask, 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) (void) reap_kids(0); } while (phase == PHASE_HOLDOFF); if (!persist) break; } } /* Wait for scripts to finish */ final_reap(); die(status); return (0); } /* * setup_signals - initialize signal handling. */ static void setup_signals() { struct sigaction sa; /* * 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. */ (void) sigemptyset(&main_sigmask); (void) sigaddset(&main_sigmask, SIGHUP); (void) sigaddset(&main_sigmask, SIGINT); (void) sigaddset(&main_sigmask, SIGTERM); (void) sigaddset(&main_sigmask, SIGCHLD); (void) sigaddset(&main_sigmask, SIGUSR2); #define SIGNAL(s, handler) if (1) { \ sa.sa_handler = handler; \ if (sigaction(s, &sa, NULL) < 0) \ fatal("Couldn't establish signal handler (%d): %m", s); \ } else ((void)0) sa.sa_mask = main_sigmask; sa.sa_flags = 0; /*CONSTANTCONDITION*/ SIGNAL(SIGHUP, hup); /* Hangup */ /*CONSTANTCONDITION*/ SIGNAL(SIGINT, term); /* Interrupt */ /*CONSTANTCONDITION*/ SIGNAL(SIGTERM, term); /* Terminate */ /*CONSTANTCONDITION*/ SIGNAL(SIGCHLD, chld); /*CONSTANTCONDITION*/ SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */ /*CONSTANTCONDITION*/ SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */ /* * Install a handler for other signals which would otherwise * cause pppd to exit without cleaning up. */ /*CONSTANTCONDITION*/ SIGNAL(SIGABRT, bad_signal); /*CONSTANTCONDITION*/ SIGNAL(SIGALRM, bad_signal); /*CONSTANTCONDITION*/ SIGNAL(SIGFPE, bad_signal); /*CONSTANTCONDITION*/ SIGNAL(SIGILL, bad_signal); /*CONSTANTCONDITION*/ SIGNAL(SIGPIPE, bad_signal); /*CONSTANTCONDITION*/ SIGNAL(SIGQUIT, bad_signal); #ifndef DEBUG /*CONSTANTCONDITION*/ SIGNAL(SIGSEGV, bad_signal); #endif #ifdef SIGBUS /*CONSTANTCONDITION*/ SIGNAL(SIGBUS, bad_signal); #endif #ifdef SIGEMT /*CONSTANTCONDITION*/ SIGNAL(SIGEMT, bad_signal); #endif #ifdef SIGPOLL /*CONSTANTCONDITION*/ SIGNAL(SIGPOLL, bad_signal); #endif #ifdef SIGPROF /*CONSTANTCONDITION*/ SIGNAL(SIGPROF, bad_signal); #endif #ifdef SIGSYS /*CONSTANTCONDITION*/ SIGNAL(SIGSYS, bad_signal); #endif #ifdef SIGTRAP /*CONSTANTCONDITION*/ SIGNAL(SIGTRAP, bad_signal); #endif #ifdef SIGVTALRM /*CONSTANTCONDITION*/ SIGNAL(SIGVTALRM, bad_signal); #endif #ifdef SIGXCPU /*CONSTANTCONDITION*/ SIGNAL(SIGXCPU, bad_signal); #endif #ifdef SIGXFSZ /*CONSTANTCONDITION*/ 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. */ (void) 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; { sys_ifname(); info("Using interface %s", ifname); script_setenv("IFNAME", ifname, iskey); if (iskey) { create_pidfile(); /* write pid to file */ create_linkpidfile(); } } /* * detach - detach us from the controlling terminal. */ void detach() { pid_t pid; char numbuf[16]; if (detached) return; if ((pid = fork()) == (pid_t)-1) { error("Couldn't detach (fork failed: %m)"); die(1); /* or just return? */ } if (pid != (pid_t)0) { /* parent */ if (locked) (void) relock(pid); exit(0); /* parent dies */ } (void) setsid(); /* * Fork again to relinquish session leadership. This is needed * to prevent the daemon from acquiring controlling terminal. */ if ((pid = fork()) == (pid_t)-1) { error("Couldn't detach (second fork failed: %m)"); die(1); /* or just return? */ } if (pid != (pid_t)0) { /* parent */ if (locked) (void) relock(pid); exit(0); /* parent dies */ } (void) chdir("/"); (void) close(0); (void) close(1); (void) 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] != '\0') create_pidfile(); if (linkpidfile[0] != '\0') create_linkpidfile(); (void) 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); (void) setlogmask(LOG_UPTO(LOG_INFO)); #endif } /* * Create a file containing our process ID. */ static void create_pidfile() { FILE *pidfile; (void) slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid", _PATH_VARRUN, ifname); if ((pidfile = fopen(pidfilename, "w")) != NULL) { (void) fprintf(pidfile, "%u\n", (unsigned)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); (void) slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid", _PATH_VARRUN, linkname); if ((pidfile = fopen(linkpidfile, "w")) != NULL) { (void) fprintf(pidfile, "%u\n", (unsigned)getpid()); if (ifname[0] != '\0') (void) 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. */ /*ARGSUSED*/ 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" }, { 0x37, "Old VJ compressed TCP/IP" }, { 0x39, "AppleTalk EDDP" }, { 0x3b, "AppleTalk SmartBuffered" }, { 0x3d, "Multilink" }, { 0x3f, "NetBIOS Frame" }, { 0x41, "Cisco LAN Extension" }, { 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" }, { 0x51, "KNX Bridging" }, { 0x53, "Encrypted" }, { 0x55, "per-link encrypted" }, { 0x57, "IPv6" }, { 0x59, "PPP Muxing" }, { 0x6f, "Stampede Bridging" }, { 0x73, "MP+" }, { 0xc1, "STMF" }, { 0xfb, "per-link compressed" }, { 0xfd, "compressed datagram" }, { 0x0201, "802.1d Hello Packets" }, { 0x0203, "IBM Source Routing BPDU" }, { 0x0205, "DEC LANBridge100 Spanning Tree" }, { 0x0207, "Cisco Discovery Protocol" }, { 0x0231, "Luxcom" }, { 0x0233, "Sigma Network Systems" }, { 0x0235, "Apple Client Server Protocol" }, { 0x0281, "MPLS Unicast" }, { 0x0283, "MPLS Multicast" }, { 0x0285, "IEEE p1284.4" }, { 0x0287, "ETSI TETRA TNP1" }, { 0x4021, "Stacker LZS" }, { 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 Control Protocol" }, { 0x8033, "Stream Protocol Control Protocol" }, { 0x8035, "Banyan Vines Control Protocol" }, { 0x803f, "NetBIOS Frames Control Protocol" }, { 0x8041, "Cisco LAN Extension Control Protocol" }, { 0x8043, "Ascom Timeplex Control Protocol" }, { 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" }, { 0x8051, "KNX Bridging Control Protocol" }, { 0x8053, "Encryption Control Protocol" }, { 0x8055, "Per-link Encryption Control Protocol" }, { 0x8057, "IPv6 Control Protocol" }, { 0x806f, "Stampede Bridging Control Protocol" }, { 0x80c1, "STMF Control Protocol" }, { 0x80fb, "Per-link Compression Control Protocol" }, { 0x80fd, "Compression Control Protocol" }, { 0x8207, "Cisco Discovery Control Protocol" }, { 0x8235, "Apple Client Server Control Protocol" }, { 0x8281, "MPLS Control Protocol" }, { 0x8287, "ETSI TETRA TNP1 Control Protocol" }, { 0xc021, "Link Control Protocol" }, { 0xc023, "Password Authentication Protocol" }, { 0xc025, "Link Quality Report" }, { 0xc027, "Shiva Password Authentication Protocol" }, { 0xc029, "CallBack Control Protocol (CBCP)" }, { 0xc02b, "Bandwidth Allocation Control Protocol" }, { 0xc02d, "BAP" }, { 0xc081, "Container Control Protocol" }, { 0xc223, "Challenge Handshake Authentication Protocol" }, { 0xc227, "Extensible Authentication Protocol" }, { 0xc281, "Funk 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); } static const char *phase_names[] = { PHASE__NAMES }; const char * phase_name(pval) int pval; { static char buf[32]; if (pval < 0 || pval >= Dim(phase_names)) { (void) slprintf(buf, sizeof (buf), "unknown %d", pval); return ((const char *)buf); } return (phase_names[pval]); } /* * get_input - called when incoming data is available. */ static void get_input() { int len, i; u_char *p; u_short protocol; struct protent *protp; const char *pname; 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) { dbglog("Discarded short packet (%d < %d)", len, PPP_HDRLEN); return; } p += 2; /* Skip address and control */ GETSHORT(protocol, p); len -= PPP_HDRLEN; pname = debug ? NULL : protocol_name(protocol); /* * Toss all non-LCP packets unless LCP is in Opened state and * discard non-authentication protocols if we're not yet * authenticated. */ if ((protocol != PPP_LCP && (phase < PHASE_AUTHENTICATE || phase > PHASE_RUNNING)) || (phase <= PHASE_AUTHENTICATE && !(protocol == PPP_LCP || protocol == PPP_LQR || protocol == PPP_PAP || protocol == PPP_CHAP))) { if (pname == NULL) dbglog("Discarded proto 0x%x in %s phase", protocol, phase_name(phase)); else dbglog("Discarded %s (0x%x) in %s phase", pname, protocol, phase_name(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) { 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; { if (new_phase_hook != NULL) (*new_phase_hook)(p, phase); phase = p; } /* * die - clean up state and exit with the specified status. */ void die(status) int status; { cleanup(); if (phase != PHASE_EXIT) { syslog(LOG_INFO, "Exit."); new_phase(PHASE_EXIT); } exit(status); } /* * cleanup - restore anything which needs to be restored before we exit */ static void cleanup() { sys_cleanup(); /* XXX: Need to check if this is okay after close_tty */ if (fd_ppp >= 0) { fd_ppp = -1; disestablish_ppp(ttyfd); } if (real_ttyfd >= 0) close_tty(); if (pidfilename[0] != '\0' && unlink(pidfilename) < 0 && errno != ENOENT) warn("unable to delete pid file %s: %m", pidfilename); pidfilename[0] = '\0'; if (linkpidfile[0] != '\0' && unlink(linkpidfile) < 0 && errno != ENOENT) warn("unable to delete pid file %s: %m", linkpidfile); linkpidfile[0] = '\0'; if (locked) { locked = 0; unlock(); } #ifdef HAVE_MULTILINK if (pppdb != NULL) { cleanup_db(); pppdb = NULL; } #endif } /* * close_tty - restore the terminal device and close it. */ static void close_tty() { int fd = real_ttyfd; real_ttyfd = -1; /* drop dtr to hang up */ if (!default_device && modem) { setdtr(fd, 0); /* * This sleep is in case the serial port has CLOCAL set by default, * and consequently will reassert DTR when we close the device. */ (void) sleep(1); } restore_tty(fd); if (tty_mode != (mode_t) -1) { if (fchmod(fd, tty_mode) != 0) { /* XXX if devnam is a symlink, this will change the link */ if (chmod(devnam, tty_mode) != 0) { error("Unable to chmod file %s: %m", devnam); } } } (void) close(fd); } /* * update_link_stats - get stats at link termination. */ void update_link_stats(u) int u; { struct timeval now; char numbuf[32]; if (gettimeofday(&now, NULL) >= 0) { link_connect_time = now.tv_sec - start_time.tv_sec; (void) slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time); script_setenv("CONNECT_TIME", numbuf, 0); } else { link_connect_time = 0; } if (get_ppp_stats(u, &link_stats)) { (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F, link_stats.bytes_out); script_setenv("BYTES_SENT", numbuf, 0); (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F, link_stats.bytes_in); script_setenv("BYTES_RCVD", numbuf, 0); (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F, link_stats.pkts_in); script_setenv("PKTS_RCVD", numbuf, 0); (void) slprintf(numbuf, sizeof(numbuf), "%" PPP_COUNTER_F, link_stats.pkts_out); script_setenv("PKTS_SENT", numbuf, 0); link_stats_valid = 1; } } struct callout { struct timeval c_time; /* time at which to call routine */ void *c_arg; /* argument to routine */ void (*c_func) __P((void *)); /* routine */ struct callout *c_next; }; static struct callout *callout = NULL; /* Callout list */ static struct timeval timenow; /* Current time */ /* * timeout - Schedule a timeout. * * Note that this timeout takes the number of seconds, NOT hz (as in * the kernel). */ void timeout(func, arg, time) void (*func) __P((void *)); void *arg; int time; { struct callout *newp, *p, **pp; MAINDEBUG(("Timeout %p:%p in %d seconds.", func, arg, time)); /* * Allocate timeout. */ if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) novm("callout structure for timeout."); newp->c_arg = arg; newp->c_func = func; (void) gettimeofday(&timenow, NULL); newp->c_time.tv_sec = timenow.tv_sec + time; newp->c_time.tv_usec = timenow.tv_usec; /* * Find correct place and link it in. */ for (pp = &callout; (p = *pp) != NULL; 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) != NULL; 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); (void) 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; sigset_t mask; BZERO(&act, sizeof (act)); act.sa_handler = SIG_IGN; (void) sigemptyset(&mask); (void) sigaddset(&mask, sig); /* * Ignore signal 'sig' temporarily, before finally re-activating the * original handler. We need to do it in the following sequence, since * otherwise the signal handler for 'sig' will be called forever. */ if (sigaction(sig, &act, &oldact) < 0) { fatal("kill_my_pg: couldn't establish signal handler (%d): %m", sig); } (void) sigprocmask(SIG_UNBLOCK, &mask, NULL); /* * Send signal 'sig' to all processes whose process group ID is equal * to the process group ID of the sender. */ (void) kill(0, sig); if (sigaction(sig, &oldact, NULL) < 0) { fatal("kill_my_pg: couldn't establish signal handler (%d): %m", sig); } } /* * hup - Catch SIGHUP signal. * * Indicates that the physical layer has been disconnected. * We don't rely on this indication; if the user has sent this * signal, we just take the link down. */ static void hup(sig) int sig; { info("Hangup (SIGHUP)"); kill_link = 1; if (status != EXIT_HANGUP) status = EXIT_USER_REQUEST; if (conn_running > 0) /* Send the signal to the [dis]connector process(es) also */ kill_my_pg(sig); if (charshunt_pid) (void) kill(charshunt_pid, sig); if (waiting) siglongjmp(sigjmp, 1); } /* * term - Catch SIGTERM signal and SIGINT signal (^C/del). * * Indicates that we should initiate a graceful disconnect and exit. */ /*ARGSUSED*/ static void term(sig) int sig; { info("Terminating on signal %d.", sig); persist = 0; /* don't try to restart */ kill_link = 1; status = EXIT_USER_REQUEST; if (conn_running > 0) /* Send the signal to the [dis]connector process(es) also */ kill_my_pg(sig); if (charshunt_pid) (void) kill(charshunt_pid, sig); if (waiting) siglongjmp(sigjmp, 1); } /* * chld - Catch SIGCHLD signal. * Sets a flag so we will call reap_kids in the mainline. */ /*ARGSUSED*/ 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; { if (debug) { print_ncpstate(0, NULL); dbglog("debug logging disabled"); (void) setlogmask(LOG_UPTO(LOG_WARNING)); debug = 0; } else { (void) setlogmask(LOG_UPTO(LOG_DEBUG)); dbglog("debug logging enabled"); print_ncpstate(0, NULL); debug = 1; } } /* * open_ccp - Catch SIGUSR2 signal. * * Try to (re)negotiate compression. */ /*ARGSUSED*/ static void open_ccp(sig) int sig; { open_ccp_flag = 1; if (waiting) siglongjmp(sigjmp, 1); } /* * bad_signal - We've caught a fatal signal. Clean up state and exit. */ static void bad_signal(sig) int sig; { static int crashed = 0; if (crashed) _exit(127); crashed = 1; error("Fatal signal %d", sig); if (conn_running > 0) kill_my_pg(SIGTERM); if (charshunt_pid) (void) kill(charshunt_pid, SIGTERM); die(127); } /* * device_script - run a program to talk to the serial device * (e.g. to run the connector or disconnector script). */ static int device_script(program, in, out, dont_wait, optname) char *program; int in, out; int dont_wait; char *optname; { pid_t pid; int status = -1; int errfd; int envpipe[2]; envpipe[0] = envpipe[1] = -1; if (!dont_wait && device_pipe_hook != NULL && pipe(envpipe) == -1) { error("Cannot create pipe for child: %m"); return (-1); } ++conn_running; pid = fork(); if (pid == (pid_t)-1) { --conn_running; error("Failed to create child process: %m"); return (-1); } if (pid == (pid_t)0) { sys_close(); closelog(); if (envpipe[0] >= 0) { if (envpipe[1] <= 2) envpipe[1] = dup(envpipe[1]); (void) close(envpipe[0]); } if (in == 2) { /* aargh!!! */ int newin = dup(in); if (in == out) out = newin; in = newin; } else if (out == 2) { out = dup(out); } if (log_to_fd >= 0) { if (log_to_fd != 2) { if (dup2(log_to_fd, 2) < 0) error("dup2(log_to_fd, STDERR) failed: %m"); } } else { (void) close(2); errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600); if (errfd >= 0 && errfd != 2) { if (dup2(errfd, 2) < 0) error("dup2(errfd, STDERR) failed: %m"); (void) close(errfd); } } if (in != 0) { if (out == 0) out = dup(out); if (dup2(in, 0) < 0) error("dup2(in, STDIN) failed: %m"); } if (out != 1) { if (dup2(out, 1) < 0) error("dup2(out, STDOUT) failed: %m"); } if (envpipe[0] >= 0 && dup2(envpipe[1], 3) < 0) error("dup2(pipe, pipeout) failed: %m"); if (real_ttyfd > 2) (void) close(real_ttyfd); if (pty_master > 2) (void) close(pty_master); if (pty_slave > 2) { (void) close(pty_slave); pty_slave = -1; } (void) setuid(uid); if (getuid() != uid) { error("setuid failed"); exit(1); } (void) setgid(getgid()); if (script_env != NULL) { while (*script_env != NULL) { if (putenv(*script_env) == -1) warn("unable to set %s for %s: %m", *script_env, program); script_env++; } } (void) execl("/bin/sh", "sh", "-c", program, (char *)0); error("could not exec /bin/sh: %m"); exit(99); /* NOTREACHED */ } if (debug) dbglog("%s option: '%s' started (pid %d)", optname, program, pid); if (dont_wait) { record_child(pid, program, NULL, NULL); status = 0; } else { if (envpipe[0] >= 0) { (void) close(envpipe[1]); (*device_pipe_hook)(envpipe[0]); } while (waitpid(pid, &status, 0) < 0) { if (errno == EINTR) continue; fatal("error waiting for (dis)connection process: %m"); } if (envpipe[0] >= 0) (void) close(envpipe[0]); --conn_running; } return (status == 0 ? 0 : -1); } /* * run-program - execute a program with given arguments, * but don't wait for it. * If the program can't be executed, logs an error unless * must_exist is 0 and the program file doesn't exist. * Returns -1 if it couldn't fork, 0 if the file doesn't exist * or isn't an executable plain file, or the process ID of the child. * If done != NULL, (*done)(arg, int) will be called later (within * reap_kids) if this routine returns value > 0. */ pid_t run_program(prog, args, must_exist, done, arg) char *prog; char **args; int must_exist; void (*done) __P((void *arg, int status)); void *arg; { pid_t pid; struct stat sbuf; int retv; /* * 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); } if (updown_script_hook != NULL) { retv = (*updown_script_hook)((const char ***)&args); if (retv == -1) { return (-1); } } pid = fork(); if (pid == (pid_t)-1) { error("Failed to create child process for %s: %m", prog); return (-1); } if (pid == (pid_t)0) { int new_fd; /* Leave the current location */ (void) setsid(); /* No controlling tty. */ (void) umask (S_IRWXG|S_IRWXO); (void) chdir ("/"); /* no current directory. */ (void) setuid(0); /* set real UID = root */ (void) setgid(getegid()); /* Ensure that nothing of our device environment is inherited. */ sys_close(); closelog(); (void) close(0); (void) close(1); (void) close(2); (void) close(ttyfd); /* tty interface to the ppp device */ if (real_ttyfd >= 0) (void) 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) { if (dup2(new_fd, 0) < 0) /* stdin <- /dev/null */ error("dup2(/dev/null, STDIN) failed: %m"); (void) close(new_fd); } if (dup2(0, 1) < 0) /* stdout -> /dev/null */ error("dup2(/dev/null, STDOUT) failed: %m"); if (dup2(0, 2) < 0) /* stderr -> /dev/null */ error("dup2(/dev/null, STDERR) failed: %m"); } #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 */ (void) execve(prog, args, script_env); if (must_exist || errno != ENOENT) { /* have to reopen the log, there's nowhere else for the message to go. */ reopen_log(); syslog(LOG_ERR, "Can't execute %s: %m", prog); closelog(); } _exit(-1); } if (debug) dbglog("Script %s started (pid %d)", prog, pid); record_child(pid, prog, done, arg); return (pid); } /* * record_child - add a child process to the list for reap_kids * to use. */ static void record_child(pid, prog, done, arg) pid_t pid; char *prog; void (*done) __P((void *, int)); 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; { pid_t pid; int status, i; struct subprocess *chp, **prevp; got_sigchld = 0; if (n_children == 0) return (0); /*CONSTANTCONDITION*/ while (1) { pid = waitpid(-1, &status, (waitfor ? 0 : WNOHANG)); if (pid == 0) { break; /* return 0 */ } else if (pid == -1) { if (errno == EINTR) continue; if (errno != ECHILD) error("Error waiting for child process: %m"); return (-1); } else { for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) { if (chp->pid == pid) { --n_children; *prevp = chp->next; break; } } if (WIFSIGNALED(status) || WIFSTOPPED(status)) { i = WIFSIGNALED(status) ? WTERMSIG(status) : WSTOPSIG(status); warn("Child process %s (pid %d) %s with signal %d (%s)", (chp != NULL ? chp->prog : "??"), pid, (WIFSIGNALED(status) ? "terminated" : "stopped"), i, signal_name(i)); } else if (debug) { dbglog("Child process %s finished (pid %d), status = %d", (chp != NULL ? chp->prog: "??"), pid, WEXITSTATUS(status)); } if ((chp != NULL) && (chp->done != NULL)) (*chp->done)(chp->arg, status); if (chp != NULL) free(chp); } } return (0); } /* * infanticide - timeout while waiting for child process. */ /*ARGSUSED*/ static void infanticide(sig) int sig; { struct subprocess *chp; static int runcount = 0; if (runcount < 2) { for (chp = children; chp != NULL; chp = chp->next) (void) kill(chp->pid, runcount == 0 ? SIGTERM : SIGKILL); } else { kill_my_pg(SIGTERM); /* Quit and hope for the best. */ n_children = 0; } runcount++; } /* * Perform final wait before exiting. */ static void final_reap() { struct sigaction sa; struct subprocess *chp; if (n_children > 0 && debug) { dbglog("Waiting for %d child processes...", n_children); for (chp = children; chp != NULL; chp = chp->next) dbglog(" pid %d: %s", chp->pid, chp->prog); } BZERO(&sa, sizeof (sa)); /*CONSTANTCONDITION*/ SIGNAL(SIGALRM, infanticide); while (n_children > 0) { (void) alarm(7); if (reap_kids(1) < 0) break; } (void) alarm(0); } /* * novm - log an error message saying we ran out of memory, and die. */ void novm(msg) char *msg; { fatal("Virtual memory exhausted allocating %s\n", msg); } /* * script_setenv - set an environment variable value to be used * for scripts that we run (e.g. ip-up, auth-up, etc.) */ void script_setenv(var, value, iskey) const char *var; const char *value; int iskey; { size_t varl = strlen(var); size_t vl = varl + strlen(value) + 2; int i; char *p, *newstring; /* * XXX: Can we assert that a tdb write lock is held here ? It appears that * Linux's use of tdb is not safe. */ newstring = (char *) malloc(vl+1); if (newstring == NULL) { novm("script environment string"); return; } *newstring++ = iskey; (void) slprintf(newstring, vl, "%s=%s", var, value); /* check if this variable is already set */ if (script_env != NULL) { for (i = 0; (p = script_env[i]) != NULL; ++i) { if (strncmp(p, var, varl) == 0 && p[varl] == '=') { #ifdef HAVE_MULTILINK if (p[-1] != '\0' && pppdb != NULL) delete_db_key(p); #endif free(p-1); script_env[i] = newstring; #ifdef HAVE_MULTILINK if (iskey && pppdb != NULL) add_db_key(newstring); update_db_entry(); #endif return; } } } else { /* no space allocated for script env. ptrs. yet */ i = 0; script_env = (char **) malloc(16 * sizeof(char *)); if (script_env == NULL) { novm("script environment variable."); 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 == NULL) { novm("expanded script environment variable."); return; } script_env = newenv; s_env_nalloc = new_n; } script_env[i] = newstring; script_env[i+1] = NULL; #ifdef HAVE_MULTILINK if (pppdb != NULL) { if (iskey) add_db_key(newstring); update_db_entry(); } #endif } /* * script_unsetenv - remove a variable from the environment * for scripts. */ void script_unsetenv(var) const char *var; { int vl = strlen(var); int i; char *p; /* * XXX: Can we assert that a tdb write lock is held here ? It appears that * Linux's use of tdb is not safe. */ if (script_env == NULL) return; for (i = 0; (p = script_env[i]) != NULL; ++i) { if (strncmp(p, var, vl) == 0 && p[vl] == '=') { #ifdef HAVE_MULTILINK if (p[-1] != '\0' && pppdb != NULL) delete_db_key(p); #endif free(p-1); while ((script_env[i] = script_env[i+1]) != NULL) ++i; break; } } #ifdef HAVE_MULTILINK if ((pppdb != NULL) && (p != NULL)) update_db_entry(); #endif } /* * script_getenv - find a variable in the script environment. */ const char * script_getenv(var) const char *var; { int vl = strlen(var); int i; char *p; if (script_env == NULL) return (NULL); for (i = 0; (p = script_env[i]) != NULL; ++i) { if (strncmp(p, var, vl) == 0 && p[vl] == '=') return ((const char *)p+vl+1); } return (NULL); } #ifdef HAVE_MULTILINK /* * 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 needs to be initialized as 1, or otherwise, the last string * is truncated by slprintf. */ vlen = 1; for (i = 0; (p = script_env[i]) != NULL; ++i) vlen += strlen(p) + 1; vbuf = malloc(vlen); if (vbuf == NULL) novm("database entry"); q = vbuf; for (i = 0; (p = script_env[i]) != NULL; ++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); (void) 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); (void) tdb_delete(pppdb, key); for (i = 0; (p = script_env[i]) != NULL; ++i) if (p[-1] != '\0') delete_db_key(p); } #endif /* HAVE_MULTILINK */ /* * open_socket - establish a stream socket connection to the nominated * host and port. * XXX: Need IPv6 support for those systems that support it (use getaddrinfo), * but requires portability changes. */ static int open_socket(dest) char *dest; { char *sep, *endp = NULL; int sock; int port = -1; u_int32_t host; struct hostent *hent = NULL; struct sockaddr_in sad; struct servent *se; /* parse host:port and resolve host to an IP address */ sep = strchr(dest, ':'); if (sep != NULL) { se = getservbyname((const char *)sep+1, "tcp"); if (se != NULL) { port = ntohs(se->s_port); } else { port = strtol(sep+1, &endp, 10); if (endp == sep+1 || *endp != '\0') { error("Can't parse host:port for socket destination"); return (-1); } } } if (port < 0 || port > 65535 || 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); } BCOPY(hent->h_addr_list[0], &host, sizeof(host)); hent->h_addr_list++; } *sep = ':'; for (;;) { /* 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); } BZERO(&sad, 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) { break; /* return sock file descriptor */ } if ((hent != NULL) && (hent->h_addr_list != NULL)) { BCOPY(hent->h_addr_list[0], &host, sizeof(host)); hent->h_addr_list++; (void) close(sock); continue; } error("Can't connect to %s: %m", dest); (void) close(sock); return (-1); } return (sock); } /* * print_ncpstate - prints out current NCP state. * * We're normally called from SIGUSR1 here, but this is safe because * these signals are blocked unless we're idle waiting for events. * There's no need to otherwise lock the data structures referenced. */ void print_ncpstate(unit, strptr) int unit; FILE *strptr; { struct protent *protp; int i; (void) flprintf(strptr, "In %s phase\n", phase_name(phase)); for (i = 0; (protp = protocols[i]) != NULL; ++i) { if (protp->print_stat != NULL) (*protp->print_stat)(unit, strptr); } sys_print_state(strptr); } /* * start_charshunt - create a child process to run the character shunt. */ static int start_charshunt(ifd, ofd) int ifd, ofd; { pid_t cpid; cpid = fork(); if (cpid == (pid_t)-1) { error("Can't fork process for character shunt: %m"); return (0); } if (cpid == (pid_t)0) { /* child */ (void) close(pty_slave); pty_slave = -1; (void) setgid(getgid()); (void) setuid(uid); if (getuid() != uid) fatal("setuid failed"); if (!nodetach) log_to_fd = -1; charshunt(ifd, ofd, record_file); exit(0); } charshunt_pid = cpid; (void) close(pty_master); pty_master = -1; ttyfd = pty_slave; record_child(cpid, "pppd (charshunt)", charshunt_done, NULL); return (1); } /*ARGSUSED*/ static void charshunt_done(arg, status) void *arg; int status; { charshunt_pid = (pid_t)0; } static void reportme(int signo) { dbglog("charshunt taking signal %d", signo); exit(1); } /* * charshunt - the character shunt, which passes characters between * the pty master side and the serial port (or stdin/stdout). * This runs as the user (not as root). * (We assume ofd >= ifd which is true the way this gets called. :-). */ static void charshunt(ifd, ofd, record_file) int ifd, ofd; char *record_file; { int n, nfds; fd_set ready, writey; u_char *ibufp, *obufp; int nibuf, nobuf; int flags; struct timeval lasttime; FILE *recordf = NULL; int ilevel, olevel, max_level; struct timeval levelt, tout, *top; /* * Reset signal handlers. */ (void) signal(SIGHUP, SIG_IGN); /* Hangup */ (void) signal(SIGINT, reportme); /* Interrupt */ (void) signal(SIGTERM, reportme); /* Terminate */ (void) signal(SIGCHLD, reportme); (void) signal(SIGUSR1, reportme); (void) signal(SIGUSR2, reportme); (void) signal(SIGABRT, reportme); (void) signal(SIGALRM, reportme); (void) signal(SIGFPE, reportme); (void) signal(SIGILL, reportme); (void) signal(SIGPIPE, reportme); (void) signal(SIGQUIT, reportme); #ifndef DEBUG (void) signal(SIGSEGV, reportme); #endif #ifdef SIGBUS (void) signal(SIGBUS, reportme); #endif #ifdef SIGEMT (void) signal(SIGEMT, reportme); #endif #ifdef SIGPOLL (void) signal(SIGPOLL, reportme); #endif #ifdef SIGPROF (void) signal(SIGPROF, reportme); #endif #ifdef SIGSYS (void) signal(SIGSYS, reportme); #endif #ifdef SIGTRAP (void) signal(SIGTRAP, reportme); #endif #ifdef SIGVTALRM (void) signal(SIGVTALRM, reportme); #endif #ifdef SIGXCPU (void) signal(SIGXCPU, reportme); #endif #ifdef SIGXFSZ (void) signal(SIGXFSZ, reportme); #endif /* * Open the record file if required. */ if (record_file != NULL) { recordf = fopen(record_file, "a"); if (recordf == NULL) error("Couldn't create record file %s: %m", record_file); } /* set all the fds to non-blocking mode */ flags = fcntl(pty_master, F_GETFL); if (flags == -1 || fcntl(pty_master, F_SETFL, flags | O_NONBLOCK) == -1) warn("couldn't set pty master to nonblock: %m"); flags = fcntl(ifd, F_GETFL); if (flags == -1 || fcntl(ifd, F_SETFL, flags | O_NONBLOCK) == -1) warn("couldn't set %s to nonblock: %m", (ifd==0? "stdin": "tty")); if (ofd != ifd) { flags = fcntl(ofd, F_GETFL); if (flags == -1 || fcntl(ofd, F_SETFL, flags | O_NONBLOCK) == -1) warn("couldn't set stdout to nonblock: %m"); } nibuf = nobuf = 0; ibufp = obufp = NULL; ilevel = olevel = 0; (void) gettimeofday(&levelt, NULL); if (max_data_rate) { max_level = max_data_rate / 10; if (max_level < MAXLEVELMINSIZE) max_level = MAXLEVELMINSIZE; } else max_level = sizeof(inpacket_buf) + 1; nfds = (ofd > pty_master? ofd: pty_master) + 1; if (recordf != NULL) { (void) gettimeofday(&lasttime, NULL); (void) putc(RECMARK_TIMESTART, recordf); /* put start marker */ (void) putc(lasttime.tv_sec >> 24, recordf); (void) putc(lasttime.tv_sec >> 16, recordf); (void) putc(lasttime.tv_sec >> 8, recordf); (void) putc(lasttime.tv_sec, recordf); lasttime.tv_usec = 0; } while (nibuf != 0 || nobuf != 0 || ofd >= 0 || pty_master >= 0) { 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 if (pty_master >= 0) FD_SET(pty_master, &writey); } else if (ifd >= 0) FD_SET(ifd, &ready); if (nobuf != 0) { if (olevel >= max_level) top = &tout; else if (ofd >= 0) FD_SET(ofd, &writey); } else { /* Don't read from pty if it's gone or it has closed. */ if (pty_master >= 0 && ofd >= 0) 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; (void) 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 || pty_master == -1) { if (errno != EINTR && errno != EAGAIN) { error("Error reading standard input: %m"); break; } nibuf = 0; } else if (nibuf == 0) { /* end of file from stdin */ (void) close(pty_master); pty_master = -1; (void) close(ifd); ifd = -1; if (recordf) if (!record_write(recordf, RECMARK_ENDRECV, NULL, 0, &lasttime)) recordf = NULL; } else { FD_SET(pty_master, &writey); if (recordf) if (!record_write(recordf, RECMARK_STARTRECV, ibufp, nibuf, &lasttime)) recordf = NULL; } } if (ofd >= 0 && pty_master >= 0 && 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 || ofd == -1) { 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 */ nibuf = 0; (void) close(ofd); ofd = -1; if (recordf) if (!record_write(recordf, RECMARK_ENDSEND, NULL, 0, &lasttime)) recordf = NULL; } else { FD_SET(ofd, &writey); if (recordf) if (!record_write(recordf, RECMARK_STARTSEND, obufp, nobuf, &lasttime)) recordf = NULL; } } if (ofd == -1) nobuf = 0; else 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) { (void) close(ofd); ofd = -1; nobuf = 0; } else if (errno != EAGAIN && errno != EINTR) { error("Error writing standard output: %m"); break; } } else { obufp += n; nobuf -= n; olevel += n; } } if (pty_master == -1) nibuf = 0; else 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 == EAGAIN || errno == EINTR) continue; if (errno != EIO) { error("Error writing pseudo-tty master: %m"); break; } (void) close(pty_master); pty_master = -1; nibuf = 0; } else { ibufp += n; nibuf -= n; ilevel += n; } } } exit(0); } static int record_write(f, code, buf, nb, tp) FILE *f; int code; u_char *buf; int nb; struct timeval *tp; { struct timeval now; int diff; (void) 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) { (void) putc(RECMARK_TIMEDELTA32, f); (void) putc(diff >> 24, f); (void) putc(diff >> 16, f); (void) putc(diff >> 8, f); (void) putc(diff, f); } else { (void) putc(RECMARK_TIMEDELTA8, f); (void) putc(diff, f); } *tp = now; } (void) putc(code, f); if (buf != NULL) { (void) putc(nb >> 8, f); (void) putc(nb, f); (void) fwrite(buf, nb, 1, f); } (void) fflush(f); if (ferror(f)) { error("Error writing record file: %m"); return (0); } return (1); }