diff options
Diffstat (limited to 'mdk-stage1/ppp/pppd/tty.c')
| -rw-r--r-- | mdk-stage1/ppp/pppd/tty.c | 1164 |
1 files changed, 0 insertions, 1164 deletions
diff --git a/mdk-stage1/ppp/pppd/tty.c b/mdk-stage1/ppp/pppd/tty.c deleted file mode 100644 index 4db707968..000000000 --- a/mdk-stage1/ppp/pppd/tty.c +++ /dev/null @@ -1,1164 +0,0 @@ -/* - * tty.c - code for handling serial ports in pppd. - * - * Copyright (C) 2000 Paul Mackerras. - * All rights reserved. - * - * Portions Copyright (c) 1989 Carnegie Mellon University. - * All rights reserved. - * - * Redistribution and use in source and binary forms are permitted - * provided that the above copyright notice and this paragraph are - * duplicated in all such forms and that any documentation, - * advertising materials, and other materials related to such - * distribution and use acknowledge that the software was developed - * by Carnegie Mellon University. The name of the - * University may not be used to endorse or promote products derived - * from this software without specific prior written permission. - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED - * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. - */ - -#define RCSID "$Id$" - -#include <stdio.h> -#include <ctype.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <signal.h> -#include <errno.h> -#include <fcntl.h> -#include <syslog.h> -#include <netdb.h> -#include <utmp.h> -#include <pwd.h> -#include <setjmp.h> -#include <sys/param.h> -#include <sys/types.h> -#include <sys/wait.h> -#include <sys/time.h> -#include <sys/resource.h> -#include <sys/stat.h> -#include <sys/socket.h> -#include <netinet/in.h> -#include <arpa/inet.h> - -#include "pppd.h" -#include "fsm.h" -#include "lcp.h" - -void tty_process_extra_options __P((void)); -void tty_check_options __P((void)); -int connect_tty __P((void)); -void disconnect_tty __P((void)); -void tty_close_fds __P((void)); -void cleanup_tty __P((void)); -void tty_do_send_config __P((int, u_int32_t, int, int)); - -static int setdevname __P((char *, char **, int)); -static int setspeed __P((char *, char **, int)); -static int setxonxoff __P((char **)); -static int setescape __P((char **)); -static void printescape __P((option_t *, void (*)(void *, char *,...),void *)); -static void finish_tty __P((void)); -static int start_charshunt __P((int, int)); -static void stop_charshunt __P((void *, 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 *)); -static int open_socket __P((char *)); -static void maybe_relock __P((void *, int)); - -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) */ -static int ttyfd; /* Serial port file descriptor */ -static char speed_str[16]; /* Serial port speed as string */ - -mode_t tty_mode = (mode_t)-1; /* Original access permissions to tty */ -int baud_rate; /* Actual bits/second for serial device */ -char *callback_script; /* script for doing callback */ -int charshunt_pid; /* Process ID for charshunt */ -int locked; /* lock() has succeeded */ -struct stat devstat; /* result of stat() on devnam */ - -/* option variables */ -int crtscts = 0; /* Use hardware flow control */ -bool modem = 1; /* Use modem control lines */ -int inspeed = 0; /* Input/Output speed requested */ -bool lockflag = 0; /* Create lock file to lock the serial dev */ -char *initializer = NULL; /* Script to initialize physical link */ -char *connect_script = NULL; /* Script to establish physical link */ -char *disconnect_script = NULL; /* Script to disestablish physical link */ -char *welcomer = NULL; /* Script to run after phys link estab. */ -char *ptycommand = NULL; /* Command to run on other side of pty */ -bool notty = 0; /* Stdin/out is not a tty */ -char *record_file = NULL; /* File to record chars sent/received */ -int max_data_rate; /* max bytes/sec through charshunt */ -bool sync_serial = 0; /* Device is synchronous serial device */ -char *pty_socket = NULL; /* Socket to connect to pty */ -int using_pty = 0; /* we're allocating a pty as the device */ - -extern uid_t uid; -extern int kill_link; - -/* XXX */ -extern int privopen; /* don't lock, open device as root */ - -u_int32_t xmit_accm[8]; /* extended transmit ACCM */ - -/* option descriptors */ -option_t tty_options[] = { - /* device name must be first, or change connect_tty() below! */ - { "device name", o_wild, (void *) &setdevname, - "Serial port device name", - OPT_DEVNAM | OPT_PRIVFIX | OPT_NOARG | OPT_A2STRVAL | OPT_STATIC, - devnam}, - - { "tty speed", o_wild, (void *) &setspeed, - "Baud rate for serial port", - OPT_PRIO | OPT_NOARG | OPT_A2STRVAL | OPT_STATIC, speed_str }, - - { "lock", o_bool, &lockflag, - "Lock serial device with UUCP-style lock file", OPT_PRIO | 1 }, - { "nolock", o_bool, &lockflag, - "Don't lock serial device", OPT_PRIOSUB | OPT_PRIV }, - - { "init", o_string, &initializer, - "A program to initialize the device", OPT_PRIO | OPT_PRIVFIX }, - - { "connect", o_string, &connect_script, - "A program to set up a connection", OPT_PRIO | OPT_PRIVFIX }, - - { "disconnect", o_string, &disconnect_script, - "Program to disconnect serial device", OPT_PRIO | OPT_PRIVFIX }, - - { "welcome", o_string, &welcomer, - "Script to welcome client", OPT_PRIO | OPT_PRIVFIX }, - - { "pty", o_string, &ptycommand, - "Script to run on pseudo-tty master side", - OPT_PRIO | OPT_PRIVFIX | OPT_DEVNAM }, - - { "notty", o_bool, ¬ty, - "Input/output is not a tty", OPT_DEVNAM | 1 }, - - { "socket", o_string, &pty_socket, - "Send and receive over socket, arg is host:port", - OPT_PRIO | OPT_DEVNAM }, - - { "record", o_string, &record_file, - "Record characters sent/received to file", OPT_PRIO }, - - { "crtscts", o_int, &crtscts, - "Set hardware (RTS/CTS) flow control", - OPT_PRIO | OPT_NOARG | OPT_VAL(1) }, - { "cdtrcts", o_int, &crtscts, - "Set alternate hardware (DTR/CTS) flow control", - OPT_PRIOSUB | OPT_NOARG | OPT_VAL(2) }, - { "nocrtscts", o_int, &crtscts, - "Disable hardware flow control", - OPT_PRIOSUB | OPT_NOARG | OPT_VAL(-1) }, - { "-crtscts", o_int, &crtscts, - "Disable hardware flow control", - OPT_PRIOSUB | OPT_ALIAS | OPT_NOARG | OPT_VAL(-1) }, - { "nocdtrcts", o_int, &crtscts, - "Disable hardware flow control", - OPT_PRIOSUB | OPT_ALIAS | OPT_NOARG | OPT_VAL(-1) }, - { "xonxoff", o_special_noarg, (void *)setxonxoff, - "Set software (XON/XOFF) flow control", OPT_PRIOSUB }, - - { "modem", o_bool, &modem, - "Use modem control lines", OPT_PRIO | 1 }, - { "local", o_bool, &modem, - "Don't use modem control lines", OPT_PRIOSUB | 0 }, - - { "sync", o_bool, &sync_serial, - "Use synchronous HDLC serial encoding", 1 }, - - { "datarate", o_int, &max_data_rate, - "Maximum data rate in bytes/sec (with pty, notty or record option)", - OPT_PRIO }, - - { "escape", o_special, (void *)setescape, - "List of character codes to escape on transmission", - OPT_A2PRINTER, (void *)printescape }, - - { NULL } -}; - - -struct channel tty_channel = { - tty_options, - &tty_process_extra_options, - &tty_check_options, - &connect_tty, - &disconnect_tty, - &tty_establish_ppp, - &tty_disestablish_ppp, - &tty_do_send_config, - &tty_recv_config, - &cleanup_tty, - &tty_close_fds -}; - -/* - * setspeed - Set the serial port baud rate. - * If doit is 0, the call is to check whether this option is - * potentially a speed value. - */ -static int -setspeed(arg, argv, doit) - char *arg; - char **argv; - int doit; -{ - char *ptr; - int spd; - - spd = strtol(arg, &ptr, 0); - if (ptr == arg || *ptr != 0 || spd == 0) - return 0; - if (doit) { - inspeed = spd; - slprintf(speed_str, sizeof(speed_str), "%d", spd); - } - return 1; -} - - -/* - * setdevname - Set the device name. - * If doit is 0, the call is to check whether this option is - * potentially a device name. - */ -static int -setdevname(cp, argv, doit) - char *cp; - char **argv; - int doit; -{ - struct stat statbuf; - char dev[MAXPATHLEN]; - - if (*cp == 0) - return 0; - - if (strncmp("/dev/", cp, 5) != 0) { - strlcpy(dev, "/dev/", sizeof(dev)); - strlcat(dev, cp, sizeof(dev)); - cp = dev; - } - - /* - * Check if there is a character device by this name. - */ - if (stat(cp, &statbuf) < 0) { - if (!doit) - return errno != ENOENT; - option_error("Couldn't stat %s: %m", cp); - return 0; - } - if (!S_ISCHR(statbuf.st_mode)) { - if (doit) - option_error("%s is not a character device", cp); - return 0; - } - - if (doit) { - strlcpy(devnam, cp, sizeof(devnam)); - devstat = statbuf; - default_device = 0; - } - - return 1; -} - -static int -setxonxoff(argv) - char **argv; -{ - lcp_wantoptions[0].asyncmap |= 0x000A0000; /* escape ^S and ^Q */ - lcp_wantoptions[0].neg_asyncmap = 1; - - crtscts = -2; - return 1; -} - -/* - * setescape - add chars to the set we escape on transmission. - */ -static int -setescape(argv) - char **argv; -{ - int n, ret; - char *p, *endp; - - p = *argv; - ret = 1; - while (*p) { - n = strtol(p, &endp, 16); - if (p == endp) { - option_error("escape parameter contains invalid hex number '%s'", - p); - return 0; - } - p = endp; - if (n < 0 || n == 0x5E || n > 0xFF) { - option_error("can't escape character 0x%x", n); - ret = 0; - } else - xmit_accm[n >> 5] |= 1 << (n & 0x1F); - while (*p == ',' || *p == ' ') - ++p; - } - lcp_allowoptions[0].asyncmap = xmit_accm[0]; - return ret; -} - -static void -printescape(opt, printer, arg) - option_t *opt; - void (*printer) __P((void *, char *, ...)); - void *arg; -{ - int n; - int first = 1; - - for (n = 0; n < 256; ++n) { - if (n == 0x7d) - n += 2; /* skip 7d, 7e */ - if (xmit_accm[n >> 5] & (1 << (n & 0x1f))) { - if (!first) - printer(arg, ","); - else - first = 0; - printer(arg, "%x", n); - } - } - if (first) - printer(arg, "oops # nothing escaped"); -} - -/* - * tty_init - do various tty-related initializations. - */ -void tty_init() -{ - add_notifier(&pidchange, maybe_relock, 0); - the_channel = &tty_channel; - xmit_accm[3] = 0x60000000; -} - -/* - * tty_process_extra_options - work out which tty device we are using - * and read its options file. - */ -void tty_process_extra_options() -{ - using_pty = notty || ptycommand != NULL || pty_socket != NULL; - if (using_pty) - return; - if (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. - * The per-tty options file should not change - * ptycommand, pty_socket, notty or devnam. - * options_for_tty doesn't override options set on the command line, - * except for some privileged options. - */ - if (!options_for_tty()) - exit(EXIT_OPTION_ERROR); -} - -/* - * tty_check_options - do consistency checks on the options we were given. - */ -void -tty_check_options() -{ - struct stat statbuf; - int fdflags; - - 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 { - /* - * 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; -} - -/* - * connect_tty - get the serial port ready to start doing PPP. - * That is, open the serial port, set its speed and mode, and run - * the connector and/or welcomer. - */ -int connect_tty() -{ - char *connector; - int fdflags; - struct stat statbuf; - char numbuf[16]; - - /* - * 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; - real_ttyfd = -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; - return -1; - } - 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) - return -1; - 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, prio; - - prio = privopen? OPRIO_ROOT: tty_options[0].priority; - if (prio < OPRIO_ROOT) - seteuid(uid); - ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0); - err = errno; - if (prio < OPRIO_ROOT) - 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) - return -1; - } - real_ttyfd = ttyfd; - 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)); - } - - /* - * 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) - return -1; - } else { - if (device_script(ptycommand, pty_master, pty_master, 1) < 0) - return -1; - ttyfd = pty_slave; - close(pty_master); - pty_master = -1; - } - } else if (pty_socket != NULL) { - int fd = open_socket(pty_socket); - if (fd < 0) - return -1; - if (!start_charshunt(fd, fd)) - return -1; - } else if (notty) { - if (!start_charshunt(0, 1)) - return -1; - } else if (record_file != NULL) { - if (!start_charshunt(ttyfd, ttyfd)) - return -1; - } - - /* 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; - return -1; - } - if (kill_link) { - disconnect_tty(); - return -1; - } - info("Serial port initialized."); - } - - if (connector && connector[0]) { - if (device_script(connector, ttyfd, ttyfd, 0) < 0) { - error("Connect script failed"); - status = EXIT_CONNECT_FAILED; - return -1; - } - if (kill_link) { - disconnect_tty(); - return -1; - } - info("Serial connection established."); - } - - /* set line speed, flow control, etc.; - clear CLOCAL if modem option */ - if (real_ttyfd != -1) - set_up_tty(real_ttyfd, 0); - - if (doing_callback == CALLBACK_DIALIN) - connector = NULL; - } - - /* reopen tty if necessary to wait for carrier */ - if (connector == NULL && modem && devnam[0] != 0) { - int i; - 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) - return -1; - } - 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"); - } - - /* - * 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. - */ - if (connector != NULL || ptycommand != NULL) - listen_time = connect_delay; - - return ttyfd; -} - - -void disconnect_tty() -{ - if (disconnect_script == NULL || hungup) - return; - 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."); - } -} - -void tty_close_fds() -{ - if (pty_master >= 0) - close(pty_master); - if (pty_slave >= 0) - close(pty_slave); - if (real_ttyfd >= 0) { - close(real_ttyfd); - real_ttyfd = -1; - } - /* N.B. ttyfd will == either pty_slave or real_ttyfd */ -} - -void cleanup_tty() -{ - if (real_ttyfd >= 0) - finish_tty(); - tty_close_fds(); - if (locked) { - unlock(); - locked = 0; - } -} - -/* - * tty_do_send_config - set transmit-side PPP configuration. - * We set the extended transmit ACCM here as well. - */ -void -tty_do_send_config(mtu, accm, pcomp, accomp) - int mtu; - u_int32_t accm; - int pcomp, accomp; -{ - tty_set_xaccm(xmit_accm); - tty_send_config(mtu, accm, pcomp, accomp); -} - -/* - * finish_tty - restore the terminal device to its original settings - */ -static void -finish_tty() -{ - /* drop dtr to hang up */ - if (!default_device && modem) { - setdtr(real_ttyfd, 0); - /* - * This sleep is in case the serial port has CLOCAL set by default, - * and consequently will reassert DTR when we close the device. - */ - sleep(1); - } - - restore_tty(real_ttyfd); - - if (tty_mode != (mode_t) -1) { - if (fchmod(real_ttyfd, tty_mode) != 0) { - /* XXX if devnam is a symlink, this will change the link */ - chmod(devnam, tty_mode); - } - } - - close(real_ttyfd); - real_ttyfd = -1; -} - -/* - * maybe_relock - our PID has changed, maybe update the lock file. - */ -static void -maybe_relock(arg, pid) - void *arg; - int pid; -{ - if (locked) - relock(pid); -} - -/* - * 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 = ':'; - - /* 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; -} - - -/* - * start_charshunt - create a child process to run the character shunt. - */ -static int -start_charshunt(ifd, ofd) - int ifd, ofd; -{ - int cpid; - - cpid = fork(); - if (cpid == -1) { - error("Can't fork process for character shunt: %m"); - return 0; - } - if (cpid == 0) { - /* child */ - close(pty_slave); - setuid(uid); - if (getuid() != uid) - fatal("setuid failed"); - setgid(getgid()); - if (!nodetach) - log_to_fd = -1; - charshunt(ifd, ofd, record_file); - exit(0); - } - charshunt_pid = cpid; - add_notifier(&sigreceived, stop_charshunt, 0); - close(pty_master); - pty_master = -1; - ttyfd = pty_slave; - record_child(cpid, "pppd (charshunt)", charshunt_done, NULL); - return 1; -} - -static void -charshunt_done(arg) - void *arg; -{ - charshunt_pid = 0; -} - -static void -stop_charshunt(arg, sig) - void *arg; - int sig; -{ - if (charshunt_pid) - kill(charshunt_pid, (sig == SIGINT? sig: SIGTERM)); -} - -/* - * charshunt - the character shunt, which passes characters between - * the pty master side and the serial port (or stdin/stdout). - * This runs as the user (not as root). - * (We assume ofd >= ifd which is true the way this gets called. :-). - */ -static void -charshunt(ifd, ofd, record_file) - int ifd, ofd; - char *record_file; -{ - int n, nfds; - fd_set ready, writey; - u_char *ibufp, *obufp; - int nibuf, nobuf; - int flags; - int pty_readable, stdin_readable; - struct timeval lasttime; - FILE *recordf = NULL; - int ilevel, olevel, max_level; - struct timeval levelt, tout, *top; - extern u_char inpacket_buf[]; - - /* - * Reset signal handlers. - */ - signal(SIGHUP, SIG_IGN); /* Hangup */ - signal(SIGINT, SIG_DFL); /* Interrupt */ - signal(SIGTERM, SIG_DFL); /* Terminate */ - signal(SIGCHLD, SIG_DFL); - signal(SIGUSR1, SIG_DFL); - signal(SIGUSR2, SIG_DFL); - signal(SIGABRT, SIG_DFL); - signal(SIGALRM, SIG_DFL); - signal(SIGFPE, SIG_DFL); - signal(SIGILL, SIG_DFL); - signal(SIGPIPE, SIG_DFL); - signal(SIGQUIT, SIG_DFL); - signal(SIGSEGV, SIG_DFL); -#ifdef SIGBUS - signal(SIGBUS, SIG_DFL); -#endif -#ifdef SIGEMT - signal(SIGEMT, SIG_DFL); -#endif -#ifdef SIGPOLL - signal(SIGPOLL, SIG_DFL); -#endif -#ifdef SIGPROF - signal(SIGPROF, SIG_DFL); -#endif -#ifdef SIGSYS - signal(SIGSYS, SIG_DFL); -#endif -#ifdef SIGTRAP - signal(SIGTRAP, SIG_DFL); -#endif -#ifdef SIGVTALRM - signal(SIGVTALRM, SIG_DFL); -#endif -#ifdef SIGXCPU - signal(SIGXCPU, SIG_DFL); -#endif -#ifdef SIGXFSZ - signal(SIGXFSZ, SIG_DFL); -#endif - - /* - * Open the record file if required. - */ - if (record_file != NULL) { - recordf = fopen(record_file, "a"); - if (recordf == NULL) - error("Couldn't create record file %s: %m", record_file); - } - - /* set all the fds to non-blocking mode */ - flags = fcntl(pty_master, F_GETFL); - if (flags == -1 - || fcntl(pty_master, F_SETFL, flags | O_NONBLOCK) == -1) - warn("couldn't set pty master to nonblock: %m"); - flags = fcntl(ifd, F_GETFL); - if (flags == -1 - || fcntl(ifd, F_SETFL, flags | O_NONBLOCK) == -1) - warn("couldn't set %s to nonblock: %m", (ifd==0? "stdin": "tty")); - if (ofd != ifd) { - flags = fcntl(ofd, F_GETFL); - if (flags == -1 - || fcntl(ofd, F_SETFL, flags | O_NONBLOCK) == -1) - warn("couldn't set stdout to nonblock: %m"); - } - - nibuf = nobuf = 0; - ibufp = obufp = NULL; - pty_readable = stdin_readable = 1; - - 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 = PPP_MRU + PPP_HDRLEN + 1; - - nfds = (ofd > pty_master? ofd: pty_master) + 1; - if (recordf != NULL) { - gettimeofday(&lasttime, NULL); - putc(7, recordf); /* put start marker */ - putc(lasttime.tv_sec >> 24, recordf); - putc(lasttime.tv_sec >> 16, recordf); - putc(lasttime.tv_sec >> 8, recordf); - putc(lasttime.tv_sec, recordf); - lasttime.tv_usec = 0; - } - - while (nibuf != 0 || nobuf != 0 || pty_readable || stdin_readable) { - 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, PPP_MRU + PPP_HDRLEN); - 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, PPP_MRU + PPP_HDRLEN); - 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); -} - -static int -record_write(f, code, buf, nb, tp) - FILE *f; - int code; - u_char *buf; - int nb; - struct timeval *tp; -{ - struct timeval now; - int diff; - - gettimeofday(&now, NULL); - now.tv_usec /= 100000; /* actually 1/10 s, not usec now */ - diff = (now.tv_sec - tp->tv_sec) * 10 + (now.tv_usec - tp->tv_usec); - if (diff > 0) { - if (diff > 255) { - putc(5, f); - putc(diff >> 24, f); - putc(diff >> 16, f); - putc(diff >> 8, f); - putc(diff, f); - } else { - putc(6, f); - putc(diff, f); - } - *tp = now; - } - putc(code, f); - if (buf != NULL) { - putc(nb >> 8, f); - putc(nb, f); - fwrite(buf, nb, 1, f); - } - fflush(f); - if (ferror(f)) { - error("Error writing record file: %m"); - return 0; - } - return 1; -} |