/*
* tty.c - code for handling serial ports in pppd.
*
- * Copyright (C) 2000-2002 Paul Mackerras. All rights reserved.
+ * Copyright (C) 2000-2004 Paul Mackerras. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The name(s) of the authors of this software must not be used to
+ * 2. The name(s) of the authors of this software must not be used to
* endorse or promote products derived from this software without
* prior written permission.
*
- * 4. Redistributions of any form whatsoever must retain the following
+ * 3. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Paul Mackerras
- * <paulus@samba.org>".
+ * <paulus@ozlabs.org>".
*
* THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
-#define RCSID "$Id: tty.c,v 1.10 2003/02/24 11:29:53 fcusack Exp $"
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
+#include <termios.h>
#include <unistd.h>
#include <signal.h>
#include <errno.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 <netinet/in.h>
#include <arpa/inet.h>
-#include "pppd.h"
+#include "pppd-private.h"
+#include "options.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));
+void tty_process_extra_options(void);
+void tty_check_options(void);
+int connect_tty(void);
+void disconnect_tty(void);
+void tty_close_fds(void);
+void cleanup_tty(void);
+void tty_do_send_config(int, u_int32_t, int, int);
+
+static int setdevname(char *, char **, int);
+static int setspeed(char *, char **, int);
+static int setxonxoff(char **);
+static int setescape(char **);
+static void printescape(struct option *, void (*)(void *, char *,...),void *);
+static void finish_tty(void);
+static int start_charshunt(int, int);
+static void stop_charshunt(void *, int);
+static void charshunt_done(void *);
+static void charshunt(int, int, char *);
+static int record_write(FILE *, int code, u_char *buf, int nb,
+ struct timeval *);
+static int open_socket(char *);
+static void maybe_relock(void *, int);
static int pty_master; /* fd for master side of pty */
static int pty_slave; /* fd for slave side of pty */
struct stat devstat; /* result of stat() on devnam */
/* option variables */
+char devnam[MAXPATHLEN]; /* Device name */
+char ppp_devname[MAXPATHLEN];/* name of PPP tty (maybe ttypx) */
int crtscts = 0; /* Use hardware flow control */
+int stop_bits = 1; /* Number of serial port stop bits */
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 */
extern uid_t uid;
extern int kill_link;
+extern int asked_to_quit;
+extern int got_sigterm;
/* 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[] = {
+static struct option tty_options[] = {
/* device name must be first, or change connect_tty() below! */
{ "device name", o_wild, (void *) &setdevname,
"Serial port device name",
OPT_PRIOSUB | OPT_ALIAS | OPT_NOARG | OPT_VAL(-1) },
{ "xonxoff", o_special_noarg, (void *)setxonxoff,
"Set software (XON/XOFF) flow control", OPT_PRIOSUB },
+ { "stop-bits", o_int, &stop_bits,
+ "Number of stop bits in serial port",
+ OPT_PRIO | OPT_PRIVFIX | OPT_LIMITS, NULL, 2, 1 },
{ "modem", o_bool, &modem,
"Use modem control lines", OPT_PRIO | 1 },
&tty_close_fds
};
+bool
+ppp_sync_serial()
+{
+ return sync_serial;
+}
+
+bool
+ppp_get_modem()
+{
+ return modem;
+}
+
+void
+ppp_set_modem(bool on)
+{
+ modem = on;
+}
+
+bool
+ppp_using_pty()
+{
+ return using_pty;
+}
+
+int
+ppp_set_pppdevnam(const char *name)
+{
+ if (name) {
+ return strlcpy(ppp_devname, name, sizeof(ppp_devname));
+ }
+ return -1;
+}
+
+const char *
+ppp_pppdevnam()
+{
+ return ppp_devname;
+}
+
+const char *
+ppp_devnam()
+{
+ return devnam;
+}
+
+int
+ppp_set_devnam(const char *name)
+{
+ if (name) {
+ return strlcpy(devnam, name, sizeof(devnam));
+ }
+ return -1;
+}
+
+
/*
* 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;
+setspeed(char *arg, char **argv, int doit)
{
char *ptr;
int spd;
* potentially a device name.
*/
static int
-setdevname(cp, argv, doit)
- char *cp;
- char **argv;
- int doit;
+setdevname(char *cp, char **argv, int doit)
{
struct stat statbuf;
char dev[MAXPATHLEN];
if (*cp == 0)
return 0;
- if (strncmp("/dev/", cp, 5) != 0) {
+ if (*cp != '/') {
strlcpy(dev, "/dev/", sizeof(dev));
strlcat(dev, cp, sizeof(dev));
cp = dev;
if (stat(cp, &statbuf) < 0) {
if (!doit)
return errno != ENOENT;
- option_error("Couldn't stat %s: %m", cp);
+ ppp_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);
+ ppp_option_error("%s is not a character device", cp);
return 0;
}
if (doit) {
- strlcpy(devnam, cp, sizeof(devnam));
+ strlcpy(devnam, cp, MAXPATHLEN);
devstat = statbuf;
default_device = 0;
}
}
static int
-setxonxoff(argv)
- char **argv;
+setxonxoff(char **argv)
{
lcp_wantoptions[0].asyncmap |= 0x000A0000; /* escape ^S and ^Q */
lcp_wantoptions[0].neg_asyncmap = 1;
* setescape - add chars to the set we escape on transmission.
*/
static int
-setescape(argv)
- char **argv;
+setescape(char **argv)
{
int n, ret;
char *p, *endp;
while (*p) {
n = strtol(p, &endp, 16);
if (p == endp) {
- option_error("escape parameter contains invalid hex number '%s'",
+ ppp_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);
+ ppp_option_error("can't escape character 0x%x", n);
ret = 0;
} else
- xmit_accm[n >> 5] |= 1 << (n & 0x1F);
+ xmit_accm[n >> 5] |= 1U << (n & 0x1F);
while (*p == ',' || *p == ' ')
++p;
}
}
static void
-printescape(opt, printer, arg)
- option_t *opt;
- void (*printer) __P((void *, char *, ...));
- void *arg;
+printescape(struct option *opt, void (*printer)(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 (xmit_accm[n >> 5] & (1U << (n & 0x1f))) {
if (!first)
printer(arg, ",");
else
/*
* tty_init - do various tty-related initializations.
*/
-void tty_init()
+void tty_init(void)
{
- add_notifier(&pidchange, maybe_relock, 0);
+ ppp_add_notify(NF_PID_CHANGE, maybe_relock, 0);
the_channel = &tty_channel;
- xmit_accm[3] = 0x60000000;
+ xmit_accm[3] = 0x60000000U;
}
/*
* tty_process_extra_options - work out which tty device we are using
* and read its options file.
*/
-void tty_process_extra_options()
+void tty_process_extra_options(void)
{
using_pty = notty || ptycommand != NULL || pty_socket != NULL;
if (using_pty)
if (default_device) {
char *p;
if (!isatty(0) || (p = ttyname(0)) == NULL) {
- option_error("no device specified and stdin is not a tty");
+ ppp_option_error("no device specified and stdin is not a tty");
exit(EXIT_OPTION_ERROR);
}
- strlcpy(devnam, p, sizeof(devnam));
+ strlcpy(devnam, p, MAXPATHLEN);
if (stat(devnam, &devstat) < 0)
fatal("Couldn't stat default device %s: %m", devnam);
}
* tty_check_options - do consistency checks on the options we were given.
*/
void
-tty_check_options()
+tty_check_options(void)
{
struct stat statbuf;
int fdflags;
- if (demand && connect_script == 0) {
- option_error("connect script is required for demand-dialling\n");
+ if (demand && notty) {
+ ppp_option_error("demand-dialling is incompatible with notty");
+ exit(EXIT_OPTION_ERROR);
+ }
+ if (demand && connect_script == 0 && ptycommand == NULL
+ && pty_socket == NULL) {
+ ppp_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 (using_pty) {
if (!default_device) {
- option_error("%s option precludes specifying device name",
- notty? "notty": "pty");
+ ppp_option_error("%s option precludes specifying device name",
+ pty_socket? "socket": notty? "notty": "pty");
exit(EXIT_OPTION_ERROR);
}
if (ptycommand != NULL && notty) {
- option_error("pty option is incompatible with notty option");
+ ppp_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");
+ ppp_option_error("socket option is incompatible with pty and notty");
exit(EXIT_OPTION_ERROR);
}
default_device = notty;
* That is, open the serial port, set its speed and mode, and run
* the connector and/or welcomer.
*/
-int connect_tty()
+int connect_tty(void)
{
char *connector;
int fdflags;
+#ifndef __linux__
struct stat statbuf;
+#endif
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));
+ strlcpy(ppp_devname, devnam, MAXPATHLEN);
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)) {
+ if (!get_pty(&pty_master, &pty_slave, ppp_devname, uid)) {
error("Couldn't allocate pseudo-tty");
- status = EXIT_FATAL_ERROR;
+ ppp_set_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;
+ ppp_set_status(EXIT_LOCK_FAILED);
if (lockflag && !privopen) {
if (lock(devnam) < 0)
- return -1;
+ goto errret;
locked = 1;
}
* 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;
+ got_sigterm = 0;
connector = doing_callback? callback_script: connect_script;
if (devnam[0] != 0) {
for (;;) {
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);
+ if (prio < OPRIO_ROOT && seteuid(uid) == -1) {
+ error("Unable to drop privileges before opening %s: %m\n",
+ devnam);
+ ppp_set_status(EXIT_OPEN_FAILED);
+ goto errret;
+ }
+ real_ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0);
err = errno;
- if (prio < OPRIO_ROOT)
- seteuid(0);
- if (ttyfd >= 0)
+ if (prio < OPRIO_ROOT && seteuid(0) == -1)
+ fatal("Unable to regain privileges");
+ if (real_ttyfd >= 0)
break;
errno = err;
if (err != EINTR) {
error("Failed to open %s: %m", devnam);
- status = EXIT_OPEN_FAILED;
+ ppp_set_status(EXIT_OPEN_FAILED);
}
if (!persist || err != EINTR)
- return -1;
+ goto errret;
}
- real_ttyfd = ttyfd;
+ ttyfd = real_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");
+#ifndef __linux__
+ /*
+ * Linux 2.4 and above blocks normal writes to the tty
+ * when it is in PPP line discipline, so this isn't needed.
+ */
/*
* Do the equivalent of `mesg n' to stop broadcast messages.
*/
warn("Couldn't restrict write permissions to %s: %m", devnam);
} else
tty_mode = statbuf.st_mode;
+#endif /* __linux__ */
/*
* Set line speed, flow control, etc.
* If the pty, socket, notty and/or record option was specified,
* start up the character shunt now.
*/
- status = EXIT_PTYCMD_FAILED;
+ ppp_set_status(EXIT_PTYCMD_FAILED);
if (ptycommand != NULL) {
if (record_file != NULL) {
int ipipe[2], opipe[2], ok;
close(opipe[0]);
close(opipe[1]);
if (!ok)
- return -1;
+ goto errret;
} else {
if (device_script(ptycommand, pty_master, pty_master, 1) < 0)
- return -1;
- ttyfd = pty_slave;
- close(pty_master);
- pty_master = -1;
+ goto errret;
}
} else if (pty_socket != NULL) {
int fd = open_socket(pty_socket);
if (fd < 0)
- return -1;
+ goto errret;
if (!start_charshunt(fd, fd))
- return -1;
+ goto errret;
+ close(fd);
} else if (notty) {
if (!start_charshunt(0, 1))
- return -1;
+ goto errret;
+ dup2(fd_devnull, 0);
+ dup2(fd_devnull, 1);
+ if (log_to_fd == 1)
+ log_to_fd = -1;
+ if (log_to_fd != 2)
+ dup2(fd_devnull, 2);
} else if (record_file != NULL) {
- if (!start_charshunt(ttyfd, ttyfd))
- return -1;
+ int fd = dup(ttyfd);
+ if (!start_charshunt(fd, fd))
+ goto errret;
+ }
+
+ if (using_pty || record_file != NULL) {
+ ttyfd = pty_slave;
+ close(pty_master);
+ pty_master = -1;
}
/* run connection script */
if (initializer && initializer[0]) {
if (device_script(initializer, ttyfd, ttyfd, 0) < 0) {
error("Initializer script failed");
- status = EXIT_INIT_FAILED;
- return -1;
+ ppp_set_status(EXIT_INIT_FAILED);
+ goto errretf;
}
- if (kill_link) {
+ if (got_sigterm) {
disconnect_tty();
- return -1;
+ goto errretf;
}
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;
+ ppp_set_status(EXIT_CONNECT_FAILED);
+ goto errretf;
}
- if (kill_link) {
+ if (got_sigterm) {
disconnect_tty();
- return -1;
+ goto errretf;
}
info("Serial connection established.");
}
break;
if (errno != EINTR) {
error("Failed to reopen %s: %m", devnam);
- status = EXIT_OPEN_FAILED;
+ ppp_set_status(EXIT_OPEN_FAILED);
}
- if (!persist || errno != EINTR || hungup || kill_link)
- return -1;
+ if (!persist || errno != EINTR || hungup || got_sigterm)
+ goto errret;
}
close(i);
}
slprintf(numbuf, sizeof(numbuf), "%d", baud_rate);
- script_setenv("SPEED", numbuf, 0);
+ ppp_script_setenv("SPEED", numbuf, 0);
/* run welcome script, if any */
if (welcomer && welcomer[0]) {
* 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)
+ if (connector != NULL || ptycommand != NULL || pty_socket != NULL)
listen_time = connect_delay;
return ttyfd;
+
+ errretf:
+ if (real_ttyfd >= 0)
+ tcflush(real_ttyfd, TCIOFLUSH);
+ errret:
+ if (pty_master >= 0) {
+ close(pty_master);
+ pty_master = -1;
+ }
+ ttyfd = -1;
+ if (got_sigterm)
+ asked_to_quit = 1;
+ return -1;
}
-void disconnect_tty()
+void disconnect_tty(void)
{
if (disconnect_script == NULL || hungup)
return;
} else {
info("Serial link disconnected.");
}
+ stop_charshunt(NULL, 0);
}
-void tty_close_fds()
+void tty_close_fds(void)
{
- if (pty_master >= 0)
- close(pty_master);
if (pty_slave >= 0)
close(pty_slave);
if (real_ttyfd >= 0) {
/* N.B. ttyfd will == either pty_slave or real_ttyfd */
}
-void cleanup_tty()
+void cleanup_tty(void)
{
if (real_ttyfd >= 0)
finish_tty();
* 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_do_send_config(int mtu, u_int32_t accm, int pcomp, int 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()
+finish_tty(void)
{
/* drop dtr to hang up */
if (!default_device && modem) {
restore_tty(real_ttyfd);
+#ifndef __linux__
if (tty_mode != (mode_t) -1) {
- if (fchmod(real_ttyfd, tty_mode) != 0) {
- /* XXX if devnam is a symlink, this will change the link */
- chmod(devnam, tty_mode);
- }
+ if (fchmod(real_ttyfd, tty_mode) != 0)
+ error("Couldn't restore tty permissions");
}
+#endif /* __linux__ */
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;
+maybe_relock(void *arg, int pid)
{
if (locked)
relock(pid);
* host and port.
*/
static int
-open_socket(dest)
- char *dest;
+open_socket(char *dest)
{
char *sep, *endp = NULL;
int sock, port = -1;
* start_charshunt - create a child process to run the character shunt.
*/
static int
-start_charshunt(ifd, ofd)
- int ifd, ofd;
+start_charshunt(int ifd, int ofd)
{
- int cpid;
+ int cpid, ret;
- cpid = fork();
+ cpid = ppp_safe_fork(ifd, ofd, (log_to_fd >= 0? log_to_fd: 2));
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());
- sys_close();
+ reopen_log();
if (!nodetach)
log_to_fd = -1;
- charshunt(ifd, ofd, record_file);
+ else if (log_to_fd >= 0)
+ log_to_fd = 2;
+ ret = setgid(getgid());
+ if (ret != 0) {
+ fatal("setgid failed, %m");
+ }
+ ret = setuid(uid);
+ if (ret != 0 || getuid() != uid) {
+ fatal("setuid failed, %m");
+ }
+ charshunt(0, 1, 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);
+ record_child(cpid, "pppd (charshunt)", charshunt_done, NULL, 1);
return 1;
}
static void
-charshunt_done(arg)
- void *arg;
+charshunt_done(void *arg)
{
charshunt_pid = 0;
}
static void
-stop_charshunt(arg, sig)
- void *arg;
- int sig;
+stop_charshunt(void *arg, int sig)
{
if (charshunt_pid)
kill(charshunt_pid, (sig == SIGINT? sig: SIGTERM));
* (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;
+charshunt(int ifd, int ofd, char *record_file)
{
int n, nfds;
fd_set ready, writey;
pty_readable = stdin_readable = 1;
ilevel = olevel = 0;
- gettimeofday(&levelt, NULL);
+ ppp_get_time(&levelt);
if (max_data_rate) {
max_level = max_data_rate / 10;
if (max_level < 100)
int nbt;
struct timeval now;
- gettimeofday(&now, NULL);
+ ppp_get_time(&now);
dt = (now.tv_sec - levelt.tv_sec
+ (now.tv_usec - levelt.tv_usec) / 1e6);
nbt = (int)(dt * max_data_rate);
} 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;
if (!record_write(recordf, 1, obufp, nobuf, &lasttime))
recordf = NULL;
}
- }
+ } else if (!stdin_readable)
+ pty_readable = 0;
if (FD_ISSET(ofd, &writey)) {
n = nobuf;
if (olevel + n > max_level)
}
static int
-record_write(f, code, buf, nb, tp)
- FILE *f;
- int code;
- u_char *buf;
- int nb;
- struct timeval *tp;
+record_write(FILE *f, int code, u_char *buf, int nb, struct timeval *tp)
{
struct timeval now;
int diff;
projects / ppp.git / blobdiff