* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
-#ifndef lint
-static char rcsid[] = "$Id: main.c,v 1.29 1995/12/18 03:50:17 paulus Exp $";
-#endif
+#define RCSID "$Id: main.c,v 1.83 1999/08/13 06:46:15 paulus Exp $"
#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 <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/resource.h>
#include <sys/stat.h>
#include <sys/socket.h>
-#include <net/if.h>
+#include <netinet/in.h>
#include "pppd.h"
#include "magic.h"
#include "pathnames.h"
#include "patchlevel.h"
+#ifdef CBCP_SUPPORT
+#include "cbcp.h"
+#endif
+
#ifdef IPX_CHANGE
#include "ipxcp.h"
#endif /* IPX_CHANGE */
-
-/*
- * If REQ_SYSOPTIONS is defined to 1, pppd will not run unless
- * /etc/ppp/options exists.
- */
-#ifndef REQ_SYSOPTIONS
-#define REQ_SYSOPTIONS 1
+#ifdef AT_CHANGE
+#include "atcp.h"
#endif
+static const char rcsid[] = RCSID;
+
/* interface vars */
-char ifname[IFNAMSIZ]; /* Interface name */
+char ifname[32]; /* Interface name */
int ifunit; /* Interface unit number */
char *progname; /* Name of this program */
char hostname[MAXNAMELEN]; /* Our hostname */
static char pidfilename[MAXPATHLEN]; /* name of pid file */
-static char default_devnam[MAXPATHLEN]; /* name of default device */
-static pid_t pid; /* Our pid */
-static pid_t pgrpid; /* Process Group ID */
+static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
+static char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
static uid_t uid; /* Our real user-id */
+static int conn_running; /* we have a [dis]connector running */
-int fd = -1; /* Device file descriptor */
+int ttyfd; /* Serial port file descriptor */
+mode_t tty_mode = -1; /* Original access permissions to tty */
+int baud_rate; /* Actual bits/second for serial device */
+int hungup; /* terminal has been hung up */
+int privileged; /* we're running as real uid root */
+int need_holdoff; /* need holdoff period before restarting */
+int detached; /* have detached from terminal */
+struct stat devstat; /* result of stat() on devnam */
+int prepass = 0; /* doing prepass to find device name */
+int devnam_fixed; /* set while in options.ttyxx file */
+volatile int status; /* exit status for pppd */
+int unsuccess; /* # unsuccessful connection attempts */
+
+static int fd_ppp = -1; /* fd for talking PPP */
+static int fd_loop; /* fd for getting demand-dial packets */
+static int pty_master; /* fd for master side of pty */
+static int pty_slave; /* fd for slave side of pty */
+static int real_ttyfd; /* fd for actual serial port (not pty) */
int phase; /* where the link is at */
int kill_link;
int open_ccp_flag;
+static int waiting;
+static sigjmp_buf sigjmp;
+
+char **script_env; /* Env. variable values for scripts */
+int s_env_nalloc; /* # words avail at script_env */
+
u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
-static u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
+u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
-int hungup; /* terminal has been hung up */
static int n_children; /* # child processes still running */
+static int got_sigchld; /* set if we have received a SIGCHLD */
-int baud_rate; /* Actual bits/second for serial device */
+static int locked; /* lock() has succeeded */
+static int privopen; /* don't lock, open device as root */
char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
+GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
+int ngroups; /* How many groups valid in groups */
+
+static struct timeval start_time; /* Time when link was started. */
+
+struct pppd_stats link_stats;
+int link_connect_time;
+int link_stats_valid;
+
+static int charshunt_pid; /* Process ID for charshunt */
+
+/*
+ * We maintain a list of child process pids and
+ * functions to call when they exit.
+ */
+struct subprocess {
+ pid_t pid;
+ char *prog;
+ void (*done) __P((void *));
+ void *arg;
+ struct subprocess *next;
+};
+
+static struct subprocess *children;
+
/* Prototypes for procedures local to this file. */
+static void create_pidfile __P((void));
+static void create_linkpidfile __P((void));
static void cleanup __P((void));
-static void close_fd __P((void));
+static void close_tty __P((void));
static void get_input __P((void));
-static void connect_time_expired __P((caddr_t));
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 int device_script __P((char *, int, int));
-static void reap_kids __P((void));
-static void pr_log __P((void *, char *, ...));
+static void holdoff_end __P((void *));
+static int device_script __P((char *, int, int, int));
+static void reap_kids __P((int waitfor));
+static void record_child __P((int, char *, void (*) (void *), void *));
+static int start_charshunt __P((int, int));
+static void charshunt_done __P((void *));
+static void charshunt __P((int, int, char *));
+static int record_write __P((FILE *, int code, u_char *buf, int nb,
+ struct timeval *));
extern char *ttyname __P((int));
extern char *getlogin __P((void));
+int main __P((int, char *[]));
#ifdef ultrix
#undef O_NONBLOCK
#define O_NONBLOCK O_NDELAY
#endif
+#ifdef ULTRIX
+#define setlogmask(x)
+#endif
+
/*
* PPP Data Link Layer "protocol" table.
* One entry per supported protocol.
&lcp_protent,
&pap_protent,
&chap_protent,
+#ifdef CBCP_SUPPORT
+ &cbcp_protent,
+#endif
&ipcp_protent,
&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, nonblock, fdflags;
+ int i, fdflags;
struct sigaction sa;
- struct cmd *cmdp;
- FILE *pidfile;
char *p;
struct passwd *pw;
struct timeval timo;
sigset_t mask;
struct protent *protp;
+ struct stat statbuf;
+ char numbuf[16];
+
+ phase = PHASE_INITIALIZE;
+
+ /*
+ * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
+ * This way we can close 0, 1, 2 in detach() without clobbering
+ * a fd that we are using.
+ */
+ if ((i = open("/dev/null", O_RDWR)) >= 0) {
+ while (0 <= i && i <= 2)
+ i = dup(i);
+ if (i >= 0)
+ close(i);
+ }
+
+ script_env = NULL;
- p = ttyname(0);
- if (p)
- strcpy(devnam, p);
- strcpy(default_devnam, devnam);
+ /* Initialize syslog facilities */
+ reopen_log();
if (gethostname(hostname, MAXNAMELEN) < 0 ) {
- perror("couldn't get hostname");
- die(1);
+ option_error("Couldn't get hostname: %m");
+ exit(1);
}
hostname[MAXNAMELEN-1] = 0;
uid = getuid();
+ privileged = uid == 0;
+ slprintf(numbuf, sizeof(numbuf), "%d", uid);
+ script_setenv("ORIG_UID", numbuf);
+
+ ngroups = getgroups(NGROUPS_MAX, groups);
/*
* Initialize to the standard option set, then parse, in order,
- * the system options file, the user's options file, and the command
- * line arguments.
+ * the system options file, the user's options file,
+ * the tty's options file, and the command line arguments.
*/
for (i = 0; (protp = protocols[i]) != NULL; ++i)
(*protp->init)(0);
-
+
progname = *argv;
- if (!options_from_file(_PATH_SYSOPTIONS, REQ_SYSOPTIONS, 0) ||
- !options_from_user() ||
- !parse_args(argc-1, argv+1) ||
- !options_for_tty())
- die(1);
+ prepass = 0;
+ 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;
+ 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;
+ if (!using_pty && default_device) {
+ char *p;
+ if (!isatty(0) || (p = ttyname(0)) == NULL) {
+ option_error("no device specified and stdin is not a tty");
+ exit(EXIT_OPTION_ERROR);
+ }
+ strlcpy(devnam, p, sizeof(devnam));
+ if (stat(devnam, &devstat) < 0)
+ fatal("Couldn't stat default device %s: %m", devnam);
+ }
+
+ /*
+ * Parse the tty options file and the command line.
+ * The per-tty options file should not change
+ * ptycommand, notty or devnam.
+ */
+ devnam_fixed = 1;
+ if (!using_pty) {
+ if (!options_for_tty())
+ exit(EXIT_OPTION_ERROR);
+ }
+
+ devnam_fixed = 0;
+ if (!parse_args(argc-1, argv+1))
+ exit(EXIT_OPTION_ERROR);
+
+ /*
+ * Check that we are running as root.
+ */
+ if (geteuid() != 0) {
+ option_error("must be root to run %s, since it is not setuid-root",
+ argv[0]);
+ exit(EXIT_NOT_ROOT);
+ }
if (!ppp_available()) {
- fprintf(stderr, no_ppp_msg);
- exit(1);
+ option_error(no_ppp_msg);
+ exit(EXIT_NO_KERNEL_SUPPORT);
}
-#ifdef IPX_CHANGE
- remove_sys_options();
-#endif /* IPX_CHANGE */
- check_auth_options();
- setipdefault();
+ /*
+ * Check that the options given are valid and consistent.
+ */
+ if (!sys_check_options())
+ exit(EXIT_OPTION_ERROR);
+ auth_check_options();
+ for (i = 0; (protp = protocols[i]) != NULL; ++i)
+ if (protp->check_options != NULL)
+ (*protp->check_options)();
+ if (demand && connector == 0) {
+ option_error("connect script is required for demand-dialling\n");
+ exit(EXIT_OPTION_ERROR);
+ }
+
+ 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);
+ }
+ 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;
/*
- * If the user has specified the default device name explicitly,
- * pretend they hadn't.
+ * Don't send log messages to the serial port, it tends to
+ * confuse the peer. :-)
*/
- if (!default_device && strcmp(devnam, default_devnam) == 0)
- default_device = 1;
+ 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;
+
+ script_setenv("DEVICE", devnam);
/*
* Initialize system-dependent stuff and magic number package.
*/
sys_init();
magic_init();
+ if (debug)
+ setlogmask(LOG_UPTO(LOG_DEBUG));
/*
* Detach ourselves from the terminal, if required,
* and identify who is running us.
*/
- if (!default_device && !nodetach && daemon(0, 0) < 0) {
- perror("Couldn't detach from controlling terminal");
- exit(1);
- }
- pid = getpid();
+ if (!nodetach && !updetach)
+ detach();
p = getlogin();
if (p == NULL) {
pw = getpwuid(uid);
else
p = "(unknown)";
}
- syslog(LOG_NOTICE, "pppd %s.%d started by %s, uid %d",
- VERSION, PATCHLEVEL, p, uid);
-
+ syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
+ VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
+ script_setenv("PPPLOGNAME", p);
+
/*
* Compute mask of all interesting signals and install signal handlers
* for each. Only one signal handler may be active at a time. Therefore,
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGTERM);
sigaddset(&mask, SIGCHLD);
+ sigaddset(&mask, SIGUSR2);
-#define SIGNAL(s, handler) { \
+#define SIGNAL(s, handler) do { \
sa.sa_handler = handler; \
- if (sigaction(s, &sa, NULL) < 0) { \
- syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \
- die(1); \
- } \
- }
+ if (sigaction(s, &sa, NULL) < 0) \
+ fatal("Couldn't establish signal handler (%d): %m", s); \
+ } while (0)
sa.sa_mask = mask;
sa.sa_flags = 0;
#endif
/*
- * Lock the device if we've been asked to.
+ * Apparently we can get a SIGPIPE when we call syslog, if
+ * syslogd has died and been restarted. Ignoring it seems
+ * be sufficient.
*/
- if (lockflag && !default_device)
- if (lock(devnam) < 0)
- die(1);
+ signal(SIGPIPE, SIG_IGN);
- do {
+ waiting = 0;
+ create_linkpidfile();
+
+ /*
+ * If we're doing dial-on-demand, set up the interface now.
+ */
+ if (demand) {
/*
- * Open the serial device and set it up to be the ppp interface.
- * If we're dialling out, or we don't want to use the modem lines,
- * we open it in non-blocking mode, but then we need to clear
- * the non-blocking I/O bit.
+ * Open the loopback channel and set it up to be the ppp interface.
+ */
+ fd_loop = open_ppp_loopback();
+
+ syslog(LOG_INFO, "Using interface ppp%d", ifunit);
+ slprintf(ifname, sizeof(ifname), "ppp%d", ifunit);
+ script_setenv("IFNAME", ifname);
+
+ create_pidfile(); /* write pid to file */
+
+ /*
+ * Configure the interface and mark it up, etc.
+ */
+ demand_conf();
+ }
+
+ for (;;) {
+
+ need_holdoff = 1;
+ ttyfd = -1;
+ real_ttyfd = -1;
+ status = EXIT_OK;
+ ++unsuccess;
+
+ if (demand) {
+ /*
+ * Don't do anything until we see some activity.
+ */
+ kill_link = 0;
+ phase = PHASE_DORMANT;
+ demand_unblock();
+ add_fd(fd_loop);
+ for (;;) {
+ if (sigsetjmp(sigjmp, 1) == 0) {
+ sigprocmask(SIG_BLOCK, &mask, NULL);
+ if (kill_link || got_sigchld) {
+ sigprocmask(SIG_UNBLOCK, &mask, NULL);
+ } else {
+ waiting = 1;
+ sigprocmask(SIG_UNBLOCK, &mask, NULL);
+ wait_input(timeleft(&timo));
+ }
+ }
+ waiting = 0;
+ calltimeout();
+ if (kill_link) {
+ if (!persist)
+ break;
+ kill_link = 0;
+ }
+ if (get_loop_output())
+ break;
+ if (got_sigchld)
+ reap_kids(0);
+ }
+ remove_fd(fd_loop);
+ if (kill_link && !persist)
+ break;
+
+ /*
+ * Now we want to bring up the link.
+ */
+ demand_block();
+ info("Starting link");
+ }
+
+ phase = PHASE_SERIALCONN;
+
+ /*
+ * Get a pty master/slave pair if the pty, notty, or record
+ * options were specified.
*/
- nonblock = (connector || !modem)? O_NONBLOCK: 0;
- if ((fd = open(devnam, nonblock | O_RDWR, 0)) < 0) {
- syslog(LOG_ERR, "Failed to open %s: %m", devnam);
- die(1);
+ strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam));
+ pty_master = -1;
+ pty_slave = -1;
+ if (ptycommand != NULL || notty || 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);
}
- if (nonblock) {
- if ((fdflags = fcntl(fd, F_GETFL)) == -1
- || fcntl(fd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
- syslog(LOG_WARNING,
- "Couldn't reset non-blocking mode on device: %m");
+
+ /*
+ * Lock the device if we've been asked to.
+ */
+ status = EXIT_LOCK_FAILED;
+ if (lockflag && !privopen) {
+ if (lock(devnam) < 0)
+ goto fail;
+ locked = 1;
}
+
+ /*
+ * Open the serial device and set it up to be the ppp interface.
+ * First we open it in non-blocking mode so we can set the
+ * various termios flags appropriately. If we aren't dialling
+ * out and we want to use the modem lines, we reopen it later
+ * in order to wait for the carrier detect signal from the modem.
+ */
hungup = 0;
kill_link = 0;
+ if (devnam[0] != 0) {
+ for (;;) {
+ /* If the user specified the device name, become the
+ user before opening it. */
+ int err;
+ if (!devnam_info.priv && !privopen)
+ seteuid(uid);
+ ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0);
+ err = errno;
+ if (!devnam_info.priv && !privopen)
+ seteuid(0);
+ if (ttyfd >= 0)
+ break;
+ errno = err;
+ if (err != EINTR) {
+ error("Failed to open %s: %m", devnam);
+ status = EXIT_OPEN_FAILED;
+ }
+ if (!persist || err != EINTR)
+ goto fail;
+ }
+ if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
+ || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
+ warn("Couldn't reset non-blocking mode on device: %m");
+
+ /*
+ * Do the equivalent of `mesg n' to stop broadcast messages.
+ */
+ if (fstat(ttyfd, &statbuf) < 0
+ || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
+ warn("Couldn't restrict write permissions to %s: %m", devnam);
+ } else
+ tty_mode = statbuf.st_mode;
+
+ /*
+ * 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 notty and/or record option was specified,
+ * start up the character shunt now.
+ */
+ status = EXIT_PTYCMD_FAILED;
+ if (ptycommand != NULL) {
+ if (record_file != NULL) {
+ int ipipe[2], opipe[2], ok;
+
+ if (pipe(ipipe) < 0 || pipe(opipe) < 0)
+ fatal("Couldn't create pipes for record option: %m");
+ ok = device_script(ptycommand, opipe[0], ipipe[1], 1) == 0
+ && start_charshunt(ipipe[0], opipe[1]);
+ close(ipipe[0]);
+ close(ipipe[1]);
+ close(opipe[0]);
+ close(opipe[1]);
+ if (!ok)
+ goto fail;
+ } else {
+ if (device_script(ptycommand, pty_master, pty_master, 1) < 0)
+ goto fail;
+ ttyfd = pty_slave;
+ close(pty_master);
+ pty_master = -1;
+ }
+ } else if (notty) {
+ if (!start_charshunt(0, 1))
+ goto fail;
+ } else if (record_file != NULL) {
+ if (!start_charshunt(ttyfd, ttyfd))
+ goto fail;
+ }
/* run connection script */
- if (connector && connector[0]) {
- MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
+ if ((connector && connector[0]) || initializer) {
+ if (real_ttyfd != -1) {
+ if (!default_device && modem) {
+ setdtr(real_ttyfd, 0); /* in case modem is off hook */
+ sleep(1);
+ setdtr(real_ttyfd, 1);
+ }
+ }
- /* set line speed, flow control, etc.; set CLOCAL for now */
- set_up_tty(fd, 1);
+ if (initializer && initializer[0]) {
+ if (device_script(initializer, ttyfd, ttyfd, 0) < 0) {
+ error("Initializer script failed");
+ status = EXIT_INIT_FAILED;
+ goto fail;
+ }
+ if (kill_link)
+ goto disconnect;
- /* drop dtr to hang up in case modem is off hook */
- if (!default_device && modem) {
- setdtr(fd, FALSE);
- sleep(1);
- setdtr(fd, TRUE);
+ info("Serial port initialized.");
}
- if (device_script(connector, fd, fd) < 0) {
- syslog(LOG_ERR, "Connect script failed");
- setdtr(fd, FALSE);
- die(1);
+ if (connector && connector[0]) {
+ if (device_script(connector, ttyfd, ttyfd, 0) < 0) {
+ error("Connect script failed");
+ status = EXIT_CONNECT_FAILED;
+ goto fail;
+ }
+ if (kill_link)
+ goto disconnect;
+
+ info("Serial connection established.");
}
- syslog(LOG_INFO, "Serial connection established.");
- sleep(1); /* give it time to set up its terminal */
+ /* set line speed, flow control, etc.;
+ clear CLOCAL if modem option */
+ if (real_ttyfd != -1)
+ set_up_tty(real_ttyfd, 0);
+ }
+
+ /* reopen tty if necessary to wait for carrier */
+ if (connector == NULL && modem && devnam[0] != 0) {
+ for (;;) {
+ if ((i = open(devnam, O_RDWR)) >= 0)
+ break;
+ if (errno != EINTR) {
+ error("Failed to reopen %s: %m", devnam);
+ status = EXIT_OPEN_FAILED;
+ }
+ if (!persist || errno != EINTR || hungup || kill_link)
+ goto fail;
+ }
+ close(i);
}
- /* set line speed, flow control, etc.; clear CLOCAL if modem option */
- set_up_tty(fd, 0);
+ slprintf(numbuf, sizeof(numbuf), "%d", baud_rate);
+ script_setenv("SPEED", numbuf);
+
+ /* run welcome script, if any */
+ if (welcomer && welcomer[0]) {
+ if (device_script(welcomer, ttyfd, ttyfd, 0) < 0)
+ warn("Welcome script failed");
+ }
/* set up the serial device as a ppp interface */
- establish_ppp();
+ fd_ppp = establish_ppp(ttyfd);
+ if (fd_ppp < 0) {
+ status = EXIT_FATAL_ERROR;
+ goto disconnect;
+ }
- syslog(LOG_INFO, "Using interface ppp%d", ifunit);
- (void) sprintf(ifname, "ppp%d", ifunit);
+ if (!demand) {
+
+ info("Using interface ppp%d", ifunit);
+ slprintf(ifname, sizeof(ifname), "ppp%d", ifunit);
+ script_setenv("IFNAME", ifname);
- /* write pid to file */
- (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
- if ((pidfile = fopen(pidfilename, "w")) != NULL) {
- fprintf(pidfile, "%d\n", pid);
- (void) fclose(pidfile);
- } else {
- syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename);
- pidfilename[0] = 0;
+ create_pidfile(); /* write pid to file */
}
/*
- * Set a timeout to close the connection once the maximum
- * connect time has expired.
+ * Start opening the connection and wait for
+ * incoming events (reply, timeout, etc.).
*/
- if (maxconnect > 0)
- TIMEOUT(connect_time_expired, 0, maxconnect);
+ notice("Connect: %s <--> %s", ifname, ppp_devnam);
+ gettimeofday(&start_time, NULL);
+ link_stats_valid = 0;
+ script_unsetenv("CONNECT_TIME");
+ script_unsetenv("BYTES_SENT");
+ script_unsetenv("BYTES_RCVD");
+ lcp_lowerup(0);
/*
- * Block all signals, start opening the connection, and wait for
- * incoming events (reply, timeout, etc.).
+ * 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.
*/
- syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
- lcp_lowerup(0);
+ if (connector != NULL || ptycommand != NULL) {
+ struct timeval t;
+ t.tv_sec = 1;
+ t.tv_usec = 0;
+ wait_input(&t);
+ }
+
lcp_open(0); /* Start protocol */
+ open_ccp_flag = 0;
+ add_fd(fd_ppp);
+ status = EXIT_NEGOTIATION_FAILED;
for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
- wait_input(timeleft(&timo));
+ if (sigsetjmp(sigjmp, 1) == 0) {
+ sigprocmask(SIG_BLOCK, &mask, NULL);
+ if (kill_link || open_ccp_flag || got_sigchld) {
+ sigprocmask(SIG_UNBLOCK, &mask, NULL);
+ } else {
+ waiting = 1;
+ sigprocmask(SIG_UNBLOCK, &mask, NULL);
+ wait_input(timeleft(&timo));
+ }
+ }
+ waiting = 0;
calltimeout();
get_input();
if (kill_link) {
lcp_close(0, "User request");
- phase = PHASE_TERMINATE;
kill_link = 0;
}
if (open_ccp_flag) {
if (phase == PHASE_NETWORK) {
ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
- ccp_open(0);
+ (*ccp_protent.open)(0);
}
open_ccp_flag = 0;
}
- reap_kids(); /* Don't leave dead kids lying around */
+ if (got_sigchld)
+ reap_kids(0); /* Don't leave dead kids lying around */
+ }
+
+ /*
+ * Print connect time and statistics.
+ */
+ if (link_stats_valid) {
+ int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
+ info("Connect time %d.%d minutes.", t/10, t%10);
+ info("Sent %d bytes, received %d bytes.",
+ link_stats.bytes_out, link_stats.bytes_in);
}
+ /*
+ * 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);
+
/*
* Run disconnector script, if requested.
* XXX we may not be able to do this if the line has hung up!
*/
- disestablish_ppp();
- if (disconnector) {
- set_up_tty(fd, 1);
- if (device_script(disconnector, fd, fd) < 0) {
- syslog(LOG_WARNING, "disconnect script failed");
+ disconnect:
+ if (disconnector && !hungup) {
+ if (real_ttyfd >= 0)
+ set_up_tty(real_ttyfd, 1);
+ if (device_script(disconnector, ttyfd, ttyfd, 0) < 0) {
+ warn("disconnect script failed");
} else {
- syslog(LOG_INFO, "Serial link disconnected.");
+ info("Serial link disconnected.");
}
}
- close_fd();
- if (unlink(pidfilename) < 0 && errno != ENOENT)
- syslog(LOG_WARNING, "unable to delete pid file: %m");
+ fail:
+ if (pty_master >= 0)
+ close(pty_master);
+ if (pty_slave >= 0)
+ close(pty_slave);
+ if (real_ttyfd >= 0)
+ close_tty();
+ if (locked) {
+ unlock();
+ locked = 0;
+ }
+
+ if (!demand) {
+ if (pidfilename[0] != 0
+ && unlink(pidfilename) < 0 && errno != ENOENT)
+ warn("unable to delete pid file %s: %m", pidfilename);
+ pidfilename[0] = 0;
+ }
+
+ if (!persist || (maxfail > 0 && unsuccess >= maxfail))
+ break;
+
+ kill_link = 0;
+ if (demand)
+ demand_discard();
+ if (holdoff > 0 && need_holdoff) {
+ phase = PHASE_HOLDOFF;
+ TIMEOUT(holdoff_end, NULL, holdoff);
+ do {
+ if (sigsetjmp(sigjmp, 1) == 0) {
+ sigprocmask(SIG_BLOCK, &mask, NULL);
+ if (kill_link || got_sigchld) {
+ sigprocmask(SIG_UNBLOCK, &mask, NULL);
+ } else {
+ waiting = 1;
+ sigprocmask(SIG_UNBLOCK, &mask, NULL);
+ wait_input(timeleft(&timo));
+ }
+ }
+ waiting = 0;
+ calltimeout();
+ if (kill_link) {
+ kill_link = 0;
+ phase = PHASE_DORMANT; /* allow signal to end holdoff */
+ }
+ if (got_sigchld)
+ reap_kids(0);
+ } while (phase == PHASE_HOLDOFF);
+ if (!persist)
+ break;
+ }
+ }
+
+ /* Wait for scripts to finish */
+ /* XXX should have a timeout here */
+ while (n_children > 0) {
+ if (debug) {
+ struct subprocess *chp;
+ dbglog("Waiting for %d child processes...", n_children);
+ for (chp = children; chp != NULL; chp = chp->next)
+ dbglog(" script %s, pid %d", chp->prog, chp->pid);
+ }
+ reap_kids(1);
+ }
+
+ die(status);
+ return 0;
+}
+
+/*
+ * detach - detach us from the controlling terminal.
+ */
+void
+detach()
+{
+ int pid;
+
+ if (detached)
+ return;
+ if ((pid = fork()) < 0) {
+ error("Couldn't detach (fork failed: %m)");
+ die(1); /* or just return? */
+ }
+ if (pid != 0) {
+ /* parent */
+ if (locked)
+ relock(pid);
+ exit(0); /* parent dies */
+ }
+ setsid();
+ chdir("/");
+ close(0);
+ close(1);
+ close(2);
+ detached = 1;
+ log_to_fd = -1;
+ /* update pid files if they have been written already */
+ if (pidfilename[0])
+ create_pidfile();
+ if (linkpidfile[0])
+ create_linkpidfile();
+}
+
+/*
+ * reopen_log - (re)open our connection to syslog.
+ */
+void
+reopen_log()
+{
+#ifdef ULTRIX
+ openlog("pppd", LOG_PID);
+#else
+ openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
+ setlogmask(LOG_UPTO(LOG_INFO));
+#endif
+}
+
+/*
+ * Create a file containing our process ID.
+ */
+static void
+create_pidfile()
+{
+ FILE *pidfile;
+ char numbuf[16];
+
+ slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
+ _PATH_VARRUN, ifname);
+ if ((pidfile = fopen(pidfilename, "w")) != NULL) {
+ fprintf(pidfile, "%d\n", getpid());
+ (void) fclose(pidfile);
+ } else {
+ error("Failed to create pid file %s: %m", pidfilename);
pidfilename[0] = 0;
+ }
+ slprintf(numbuf, sizeof(numbuf), "%d", getpid());
+ script_setenv("PPPD_PID", numbuf);
+ if (linkpidfile[0])
+ create_linkpidfile();
+}
- } while (persist);
+static void
+create_linkpidfile()
+{
+ FILE *pidfile;
- die(0);
+ if (linkname[0] == 0)
+ return;
+ slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
+ _PATH_VARRUN, linkname);
+ if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
+ fprintf(pidfile, "%d\n", getpid());
+ if (pidfilename[0])
+ fprintf(pidfile, "%s\n", ifname);
+ (void) fclose(pidfile);
+ } else {
+ error("Failed to create pid file %s: %m", linkpidfile);
+ linkpidfile[0] = 0;
+ }
+ script_setenv("LINKNAME", linkname);
}
+/*
+ * holdoff_end - called via a timeout when the holdoff period ends.
+ */
+static void
+holdoff_end(arg)
+ void *arg;
+{
+ phase = PHASE_DORMANT;
+}
/*
* get_input - called when incoming data is available.
return;
if (len == 0) {
- syslog(LOG_NOTICE, "Modem hangup");
+ 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)*/)
- log_packet(p, len, "rcvd ");
+ dbglog("rcvd %P", p, len);
if (len < PPP_HDRLEN) {
- MAINDEBUG((LOG_INFO, "io(): Received short packet."));
+ MAINDEBUG(("io(): Received short packet."));
return;
}
* Toss all non-LCP packets unless LCP is OPEN.
*/
if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
- MAINDEBUG((LOG_INFO,
- "io(): Received non-LCP packet when LCP not open."));
+ MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
+ return;
+ }
+
+ /*
+ * Until we get past the authentication phase, toss all packets
+ * except LCP, LQR and authentication packets.
+ */
+ if (phase <= PHASE_AUTHENTICATE
+ && !(protocol == PPP_LCP || protocol == PPP_LQR
+ || protocol == PPP_PAP || protocol == PPP_CHAP)) {
+ MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
+ protocol, phase));
return;
}
}
if (debug)
- syslog(LOG_WARNING, "Unsupported protocol (0x%x) received", protocol);
+ warn("Unsupported protocol (0x%x) received", protocol);
lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
}
/*
- * quit - Clean up state and exit (with an error indication).
- */
-void
-quit()
-{
- die(1);
-}
-
-/*
- * die - like quit, except we can specify an exit status.
+ * die - clean up state and exit with the specified status.
*/
void
die(status)
exit(status);
}
-/*
- * connect_time_expired - log a message and close the connection.
- */
-static void
-connect_time_expired(arg)
- caddr_t arg;
-{
- syslog(LOG_INFO, "Connect time expired");
-
- phase = PHASE_TERMINATE;
- lcp_close(0, "Connect time expired"); /* Close connection */
-}
-
/*
* cleanup - restore anything which needs to be restored before we exit
*/
{
sys_cleanup();
- if (fd >= 0)
- close_fd();
+ if (fd_ppp >= 0)
+ disestablish_ppp(ttyfd);
+ if (real_ttyfd >= 0)
+ close_tty();
if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
- syslog(LOG_WARNING, "unable to delete pid file: %m");
+ 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 (lockflag && !default_device)
+ if (locked)
unlock();
}
/*
- * close_fd - restore the terminal device and close it.
+ * close_tty - restore the terminal device and close it.
*/
static void
-close_fd()
+close_tty()
{
- disestablish_ppp();
-
/* drop dtr to hang up */
- if (modem)
- setdtr(fd, FALSE);
+ 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();
+ restore_tty(real_ttyfd);
- close(fd);
- fd = -1;
+ 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;
+}
+
+/*
+ * update_link_stats - get stats at link termination.
+ */
+void
+update_link_stats(u)
+ int u;
+{
+ struct timeval now;
+ char numbuf[32];
+
+ if (!get_ppp_stats(u, &link_stats)
+ || gettimeofday(&now, NULL) < 0)
+ return;
+ link_connect_time = now.tv_sec - start_time.tv_sec;
+ link_stats_valid = 1;
+
+ slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
+ script_setenv("CONNECT_TIME", numbuf);
+ slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out);
+ script_setenv("BYTES_SENT", numbuf);
+ slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in);
+ script_setenv("BYTES_RCVD", numbuf);
}
struct callout {
struct timeval c_time; /* time at which to call routine */
- caddr_t c_arg; /* argument to routine */
- void (*c_func)(); /* routine */
+ void *c_arg; /* argument to routine */
+ void (*c_func) __P((void *)); /* routine */
struct callout *c_next;
};
*/
void
timeout(func, arg, time)
- void (*func)();
- caddr_t arg;
+ void (*func) __P((void *));
+ void *arg;
int time;
{
struct callout *newp, *p, **pp;
- MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.",
- (long) func, (long) arg, time));
+ MAINDEBUG(("Timeout %p:%p in %d seconds.", func, arg, time));
/*
* Allocate timeout.
*/
- if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
- syslog(LOG_ERR, "Out of memory in timeout()!");
- die(1);
- }
+ if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
+ fatal("Out of memory in timeout()!");
newp->c_arg = arg;
newp->c_func = func;
gettimeofday(&timenow, NULL);
for (pp = &callout; (p = *pp); pp = &p->c_next)
if (newp->c_time.tv_sec < p->c_time.tv_sec
|| (newp->c_time.tv_sec == p->c_time.tv_sec
- && newp->c_time.tv_usec < p->c_time.tv_sec))
+ && newp->c_time.tv_usec < p->c_time.tv_usec))
break;
newp->c_next = p;
*pp = newp;
*/
void
untimeout(func, arg)
- void (*func)();
- caddr_t arg;
+ void (*func) __P((void *));
+ void *arg;
{
- struct itimerval itv;
struct callout **copp, *freep;
- int reschedule = 0;
- MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg));
+ MAINDEBUG(("Untimeout %p:%p.", func, arg));
/*
* Find first matching timeout and remove it from the list.
while (callout != NULL) {
p = callout;
- if (gettimeofday(&timenow, NULL) < 0) {
- syslog(LOG_ERR, "Failed to get time of day: %m");
- die(1);
- }
+ 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)))
return tvp;
}
-
+
+
+/*
+ * kill_my_pg - send a signal to our process group, and ignore it ourselves.
+ */
+static void
+kill_my_pg(sig)
+ int sig;
+{
+ struct sigaction act, oldact;
+
+ act.sa_handler = SIG_IGN;
+ act.sa_flags = 0;
+ kill(0, sig);
+ sigaction(sig, &act, &oldact);
+ sigaction(sig, &oldact, NULL);
+}
+
/*
* hup - Catch SIGHUP signal.
hup(sig)
int sig;
{
- syslog(LOG_INFO, "Hangup (SIGHUP)");
+ info("Hangup (SIGHUP)");
kill_link = 1;
+ if (status != EXIT_HANGUP)
+ status = EXIT_USER_REQUEST;
+ if (conn_running)
+ /* Send the signal to the [dis]connector process(es) also */
+ kill_my_pg(sig);
+ if (charshunt_pid)
+ kill(charshunt_pid, sig);
+ if (waiting)
+ siglongjmp(sigjmp, 1);
}
term(sig)
int sig;
{
- syslog(LOG_INFO, "Terminating on signal %d.", sig);
+ info("Terminating on signal %d.", sig);
persist = 0; /* don't try to restart */
kill_link = 1;
+ status = EXIT_USER_REQUEST;
+ if (conn_running)
+ /* Send the signal to the [dis]connector process(es) also */
+ kill_my_pg(sig);
+ if (charshunt_pid)
+ kill(charshunt_pid, sig);
+ if (waiting)
+ siglongjmp(sigjmp, 1);
}
/*
* chld - Catch SIGCHLD signal.
- * Calls reap_kids to get status for any dead kids.
+ * Sets a flag so we will call reap_kids in the mainline.
*/
static void
chld(sig)
int sig;
{
- reap_kids();
+ got_sigchld = 1;
+ if (waiting)
+ siglongjmp(sigjmp, 1);
}
int sig;
{
debug = !debug;
- note_debug_level();
+ if (debug) {
+ setlogmask(LOG_UPTO(LOG_DEBUG));
+ } else {
+ setlogmask(LOG_UPTO(LOG_WARNING));
+ }
}
int sig;
{
open_ccp_flag = 1;
+ if (waiting)
+ siglongjmp(sigjmp, 1);
}
bad_signal(sig)
int sig;
{
- syslog(LOG_ERR, "Fatal signal %d", sig);
- die(1);
+ static int crashed = 0;
+
+ if (crashed)
+ _exit(127);
+ crashed = 1;
+ error("Fatal signal %d", sig);
+ if (conn_running)
+ kill_my_pg(SIGTERM);
+ if (charshunt_pid)
+ kill(charshunt_pid, SIGTERM);
+ die(127);
}
/*
- * device_script - run a program to connect or disconnect the
- * serial device.
+ * 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)
+device_script(program, in, out, dont_wait)
char *program;
int in, out;
+ int dont_wait;
{
int pid;
- int status;
+ int status = -1;
int errfd;
+ ++conn_running;
pid = fork();
if (pid < 0) {
- syslog(LOG_ERR, "Failed to create child process: %m");
- die(1);
+ --conn_running;
+ error("Failed to create child process: %m");
+ return -1;
}
if (pid == 0) {
- dup2(in, 0);
- dup2(out, 1);
- errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0644);
- if (errfd >= 0)
- dup2(errfd, 2);
- setuid(getuid());
+ sys_close();
+ closelog();
+ if (in == 2) {
+ /* aargh!!! */
+ int newin = dup(in);
+ if (in == out)
+ out = newin;
+ in = newin;
+ } else if (out == 2) {
+ out = dup(out);
+ }
+ if (log_to_fd >= 0) {
+ if (log_to_fd != 2)
+ dup2(log_to_fd, 2);
+ } else {
+ close(2);
+ errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
+ if (errfd >= 0 && errfd != 2) {
+ dup2(errfd, 2);
+ close(errfd);
+ }
+ }
+ if (in != 0) {
+ if (out == 0)
+ out = dup(out);
+ dup2(in, 0);
+ }
+ if (out != 1) {
+ dup2(out, 1);
+ }
+ if (real_ttyfd > 2)
+ close(real_ttyfd);
+ if (pty_master > 2)
+ close(pty_master);
+ if (pty_slave > 2)
+ close(pty_slave);
+ setuid(uid);
+ if (getuid() != uid) {
+ error("setuid failed");
+ exit(1);
+ }
setgid(getgid());
execl("/bin/sh", "sh", "-c", program, (char *)0);
- syslog(LOG_ERR, "could not exec /bin/sh: %m");
- _exit(99);
+ error("could not exec /bin/sh: %m");
+ exit(99);
/* NOTREACHED */
}
- while (waitpid(pid, &status, 0) < 0) {
- if (errno == EINTR)
- continue;
- syslog(LOG_ERR, "error waiting for (dis)connection process: %m");
- die(1);
+ if (dont_wait) {
+ record_child(pid, program, NULL, NULL);
+ status = 0;
+ } else {
+ while (waitpid(pid, &status, 0) < 0) {
+ if (errno == EINTR)
+ continue;
+ fatal("error waiting for (dis)connection process: %m");
+ }
+ --conn_running;
}
return (status == 0 ? 0 : -1);
* but don't wait for it.
* If the program can't be executed, logs an error unless
* must_exist is 0 and the program file doesn't exist.
+ * Returns -1 if it couldn't fork, 0 if the file doesn't exist
+ * or isn't an executable plain file, or the process ID of the child.
+ * If done != NULL, (*done)(arg) will be called later (within
+ * reap_kids) iff the return value is > 0.
*/
-int
-run_program(prog, args, must_exist)
+pid_t
+run_program(prog, args, must_exist, done, arg)
char *prog;
char **args;
int must_exist;
+ void (*done) __P((void *));
+ void *arg;
{
int pid;
- char *nullenv[1];
+ struct stat sbuf;
+
+ /*
+ * First check if the file exists and is executable.
+ * We don't use access() because that would use the
+ * real user-id, which might not be root, and the script
+ * might be accessible only to root.
+ */
+ errno = EINVAL;
+ if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
+ || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
+ if (must_exist || errno != ENOENT)
+ warn("Can't execute %s: %m", prog);
+ return 0;
+ }
pid = fork();
if (pid == -1) {
- syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
+ error("Failed to create child process for %s: %m", prog);
return -1;
}
if (pid == 0) {
int new_fd;
/* Leave the current location */
- (void) setsid(); /* No controlling tty. */
+ (void) setsid(); /* No controlling tty. */
(void) umask (S_IRWXG|S_IRWXO);
- (void) chdir ("/"); /* no current directory. */
- setuid(geteuid());
+ (void) chdir ("/"); /* no current directory. */
+ setuid(0); /* set real UID = root */
setgid(getegid());
/* Ensure that nothing of our device environment is inherited. */
+ sys_close();
+ closelog();
close (0);
close (1);
close (2);
- close (fd); /* tty interface to the ppp device */
- /* XXX should call sysdep cleanup procedure here */
+ close (ttyfd); /* tty interface to the ppp device */
+ if (real_ttyfd >= 0)
+ close(real_ttyfd);
/* Don't pass handles to the PPP device, even by accident. */
new_fd = open (_PATH_DEVNULL, O_RDWR);
#ifdef BSD
/* Force the priority back to zero if pppd is running higher. */
if (setpriority (PRIO_PROCESS, 0, 0) < 0)
- syslog (LOG_WARNING, "can't reset priority to 0: %m");
+ warn("can't reset priority to 0: %m");
#endif
/* SysV recommends a second fork at this point. */
- /* run the program; give it a null environment */
- nullenv[0] = NULL;
- execve(prog, args, nullenv);
- if (must_exist || errno != ENOENT)
- syslog(LOG_WARNING, "Can't execute %s: %m", prog);
+ /* run the program */
+ execve(prog, args, script_env);
+ if (must_exist || errno != ENOENT) {
+ /* have to reopen the log, there's nowhere else
+ for the message to go. */
+ reopen_log();
+ syslog(LOG_ERR, "Can't execute %s: %m", prog);
+ closelog();
+ }
_exit(-1);
}
- MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
+
+ 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)
+ int pid;
+ char *prog;
+ void (*done) __P((void *));
+ void *arg;
+{
+ struct subprocess *chp;
+
++n_children;
- return 0;
+
+ 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;
+ }
}
* and log a message for abnormal terminations.
*/
static void
-reap_kids()
+reap_kids(waitfor)
+ int waitfor;
{
int pid, status;
+ struct subprocess *chp, **prevp;
+ got_sigchld = 0;
if (n_children == 0)
return;
- if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
- if (errno != ECHILD)
- syslog(LOG_ERR, "Error waiting for child process: %m");
- return;
- }
- if (pid > 0) {
+ while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
+ && pid != 0) {
--n_children;
- if (WIFSIGNALED(status)) {
- syslog(LOG_WARNING, "Child process %d terminated with signal %d",
- pid, WTERMSIG(status));
+ for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
+ if (chp->pid == pid) {
+ *prevp = chp->next;
+ break;
+ }
}
+ if (WIFSIGNALED(status)) {
+ warn("Child process %s (pid %d) terminated with signal %d",
+ (chp? chp->prog: "??"), pid, WTERMSIG(status));
+ } else if (debug)
+ dbglog("Script %s finished (pid %d), status = 0x%x",
+ (chp? chp->prog: "??"), pid, status);
+ if (chp && chp->done)
+ (*chp->done)(chp->arg);
+ if (chp)
+ free(chp);
}
+ if (pid == -1 && errno != ECHILD && errno != EINTR)
+ error("Error waiting for child process: %m");
}
/*
- * log_packet - format a packet and log it.
+ * novm - log an error message saying we ran out of memory, and die.
*/
-
-char line[256]; /* line to be logged accumulated here */
-char *linep;
-
void
-log_packet(p, len, prefix)
- u_char *p;
- int len;
- char *prefix;
+novm(msg)
+ char *msg;
{
- strcpy(line, prefix);
- linep = line + strlen(line);
- format_packet(p, len, pr_log, NULL);
- if (linep != line)
- syslog(LOG_DEBUG, "%s", line);
+ fatal("Virtual memory exhausted allocating %s\n", msg);
}
/*
- * format_packet - make a readable representation of a packet,
- * calling `printer(arg, format, ...)' to output it.
+ * script_setenv - set an environment variable value to be used
+ * for scripts that we run (e.g. ip-up, auth-up, etc.)
*/
void
-format_packet(p, len, printer, arg)
- u_char *p;
- int len;
- void (*printer) __P((void *, char *, ...));
- void *arg;
+script_setenv(var, value)
+ char *var, *value;
{
- int i, n;
- u_short proto;
- u_char x;
- struct protent *protp;
+ size_t vl = strlen(var) + strlen(value) + 2;
+ int i;
+ char *p, *newstring;
- if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
- p += 2;
- GETSHORT(proto, p);
- len -= PPP_HDRLEN;
- for (i = 0; (protp = protocols[i]) != NULL; ++i)
- if (proto == protp->protocol)
- break;
- if (protp != NULL) {
- printer(arg, "[%s", protp->name);
- n = (*protp->printpkt)(p, len, printer, arg);
- printer(arg, "]");
- p += n;
- len -= n;
- } else {
- printer(arg, "[proto=0x%x]", proto);
+ newstring = (char *) malloc(vl);
+ if (newstring == 0)
+ return;
+ slprintf(newstring, vl, "%s=%s", var, value);
+
+ /* check if this variable is already set */
+ if (script_env != 0) {
+ for (i = 0; (p = script_env[i]) != 0; ++i) {
+ if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
+ free(p);
+ script_env[i] = newstring;
+ return;
+ }
}
+ } else {
+ i = 0;
+ script_env = (char **) malloc(16 * sizeof(char *));
+ if (script_env == 0)
+ return;
+ s_env_nalloc = 16;
}
- for (; len > 0; --len) {
- GETCHAR(x, p);
- printer(arg, " %.2x", x);
+ /* reallocate script_env with more space if needed */
+ if (i + 1 >= s_env_nalloc) {
+ int new_n = i + 17;
+ char **newenv = (char **) realloc((void *)script_env,
+ new_n * sizeof(char *));
+ if (newenv == 0)
+ return;
+ script_env = newenv;
+ s_env_nalloc = new_n;
}
-}
-#ifdef __STDC__
-#include <stdarg.h>
+ script_env[i] = newstring;
+ script_env[i+1] = 0;
+}
-static void
-pr_log(void *arg, char *fmt, ...)
+/*
+ * script_unsetenv - remove a variable from the environment
+ * for scripts.
+ */
+void
+script_unsetenv(var)
+ char *var;
{
- int n;
- va_list pvar;
- char buf[256];
-
- va_start(pvar, fmt);
- vsprintf(buf, fmt, pvar);
- va_end(pvar);
-
- n = strlen(buf);
- if (linep + n + 1 > line + sizeof(line)) {
- syslog(LOG_DEBUG, "%s", line);
- linep = line;
+ int vl = strlen(var);
+ int i;
+ char *p;
+
+ if (script_env == 0)
+ return;
+ for (i = 0; (p = script_env[i]) != 0; ++i) {
+ if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
+ free(p);
+ while ((script_env[i] = script_env[i+1]) != 0)
+ ++i;
+ break;
+ }
}
- strcpy(linep, buf);
- linep += n;
}
-#else /* __STDC__ */
-#include <varargs.h>
+/*
+ * 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;
+ close(pty_master);
+ pty_master = -1;
+ ttyfd = pty_slave;
+ record_child(cpid, "pppd (charshunt)", charshunt_done, NULL);
+ return 1;
+}
static void
-pr_log(arg, fmt, va_alist)
-void *arg;
-char *fmt;
-va_dcl
+charshunt_done(arg)
+ void *arg;
{
- int n;
- va_list pvar;
- char buf[256];
-
- va_start(pvar);
- vsprintf(buf, fmt, pvar);
- va_end(pvar);
-
- n = strlen(buf);
- if (linep + n + 1 > line + sizeof(line)) {
- syslog(LOG_DEBUG, "%s", line);
- linep = line;
- }
- strcpy(linep, buf);
- linep += n;
+ charshunt_pid = 0;
}
-#endif
/*
- * print_string - print a readable representation of a string using
- * printer.
+ * 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. :-).
*/
-void
-print_string(p, len, printer, arg)
- char *p;
- int len;
- void (*printer) __P((void *, char *, ...));
- void *arg;
+static void
+charshunt(ifd, ofd, record_file)
+ int ifd, ofd;
+ char *record_file;
{
- int c;
+ 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;
- printer(arg, "\"");
- for (; len > 0; --len) {
- c = *p++;
- if (' ' <= c && c <= '~')
- printer(arg, "%c", c);
- else
- printer(arg, "\\%.3o", c);
+ /*
+ * 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;
+ 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) {
+ FD_ZERO(&ready);
+ FD_ZERO(&writey);
+ if (nibuf != 0)
+ FD_SET(pty_master, &writey);
+ else if (stdin_readable)
+ FD_SET(ifd, &ready);
+ if (nobuf != 0)
+ FD_SET(ofd, &writey);
+ else if (pty_readable)
+ FD_SET(pty_master, &ready);
+ if (select(nfds, &ready, &writey, NULL, NULL) < 0) {
+ if (errno != EINTR)
+ fatal("select");
+ continue;
+ }
+ if (FD_ISSET(ifd, &ready)) {
+ ibufp = inpacket_buf;
+ nibuf = read(ifd, ibufp, sizeof(inpacket_buf));
+ if (nibuf < 0 && errno == EIO)
+ nibuf = 0;
+ if (nibuf < 0) {
+ if (!(errno == EINTR || errno == EAGAIN)) {
+ error("Error reading standard input: %m");
+ break;
+ }
+ nibuf = 0;
+ } else if (nibuf == 0) {
+ /* end of file from stdin */
+ stdin_readable = 0;
+ /* do a 0-length write, hopefully this will generate
+ an EOF (hangup) on the slave side. */
+ write(pty_master, inpacket_buf, 0);
+ if (recordf)
+ if (!record_write(recordf, 4, NULL, 0, &lasttime))
+ recordf = NULL;
+ } else {
+ FD_SET(pty_master, &writey);
+ if (recordf)
+ if (!record_write(recordf, 2, ibufp, nibuf, &lasttime))
+ recordf = NULL;
+ }
+ }
+ if (FD_ISSET(pty_master, &ready)) {
+ obufp = outpacket_buf;
+ nobuf = read(pty_master, obufp, sizeof(outpacket_buf));
+ if (nobuf < 0 && errno == EIO)
+ nobuf = 0;
+ if (nobuf < 0) {
+ if (!(errno == EINTR || errno == EAGAIN)) {
+ error("Error reading pseudo-tty master: %m");
+ break;
+ }
+ nobuf = 0;
+ } else if (nobuf == 0) {
+ /* end of file from the pty - slave side has closed */
+ pty_readable = 0;
+ stdin_readable = 0; /* pty is not writable now */
+ nibuf = 0;
+ close(ofd);
+ if (recordf)
+ if (!record_write(recordf, 3, NULL, 0, &lasttime))
+ recordf = NULL;
+ } else {
+ FD_SET(ofd, &writey);
+ if (recordf)
+ if (!record_write(recordf, 1, obufp, nobuf, &lasttime))
+ recordf = NULL;
+ }
+ }
+ if (FD_ISSET(ofd, &writey)) {
+ n = write(ofd, obufp, nobuf);
+ if (n < 0) {
+ if (errno != EIO) {
+ error("Error writing standard output: %m");
+ break;
+ }
+ pty_readable = 0;
+ nobuf = 0;
+ } else {
+ obufp += n;
+ nobuf -= n;
+ }
+ }
+ if (FD_ISSET(pty_master, &writey)) {
+ n = write(pty_master, ibufp, nibuf);
+ if (n < 0) {
+ if (errno != EIO) {
+ error("Error writing pseudo-tty master: %m");
+ break;
+ }
+ stdin_readable = 0;
+ nibuf = 0;
+ } else {
+ ibufp += n;
+ nibuf -= n;
+ }
+ }
}
- printer(arg, "\"");
+ exit(0);
}
-/*
- * novm - log an error message saying we ran out of memory, and die.
- */
-void
-novm(msg)
- char *msg;
+static int
+record_write(f, code, buf, nb, tp)
+ FILE *f;
+ int code;
+ u_char *buf;
+ int nb;
+ struct timeval *tp;
{
- syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);
- die(1);
+ struct timeval now;
+ int diff;
+
+ gettimeofday(&now, NULL);
+ now.tv_usec /= 100000; /* actually 1/10 s, not usec now */
+ diff = (now.tv_sec - tp->tv_sec) * 10 + (now.tv_usec - tp->tv_usec);
+ if (diff > 0) {
+ if (diff > 255) {
+ putc(5, f);
+ putc(diff >> 24, f);
+ putc(diff >> 16, f);
+ putc(diff >> 8, f);
+ putc(diff, f);
+ } else {
+ putc(6, f);
+ putc(diff, f);
+ }
+ *tp = now;
+ }
+ putc(code, f);
+ if (buf != NULL) {
+ putc(nb >> 8, f);
+ putc(nb, f);
+ fwrite(buf, nb, 1, f);
+ }
+ fflush(f);
+ if (ferror(f)) {
+ error("Error writing record file: %m");
+ return 0;
+ }
+ return 1;
}
projects / ppp.git / blobdiff