1589 lines
34 KiB
C
1589 lines
34 KiB
C
/*
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* main.c - Point-to-Point Protocol main module
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static char rcsid[] = "$Id: main.c,v 1.13 1997/08/19 17:52:43 peter Exp $";
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#endif
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <syslog.h>
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#include <netdb.h>
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#include <utmp.h>
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#include <pwd.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include "pppd.h"
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#include "magic.h"
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#include "fsm.h"
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#include "lcp.h"
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#include "ipcp.h"
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#include "upap.h"
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#include "chap.h"
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#include "ccp.h"
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#include "pathnames.h"
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#include "patchlevel.h"
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#ifdef CBCP_SUPPORT
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#include "cbcp.h"
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#endif
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#if defined(SUNOS4)
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extern char *strerror();
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#endif
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#ifdef IPX_CHANGE
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#include "ipxcp.h"
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#endif /* IPX_CHANGE */
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#ifdef AT_CHANGE
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#include "atcp.h"
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#endif
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/* interface vars */
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char ifname[IFNAMSIZ]; /* Interface name */
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int ifunit; /* Interface unit number */
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char *progname; /* Name of this program */
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char hostname[MAXNAMELEN]; /* Our hostname */
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static char pidfilename[MAXPATHLEN]; /* name of pid file */
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static char iffilename[MAXPATHLEN]; /* name of if file */
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static char default_devnam[MAXPATHLEN]; /* name of default device */
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static pid_t pid; /* Our pid */
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static uid_t uid; /* Our real user-id */
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time_t etime,stime; /* End and Start time */
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int minutes; /* connection duration */
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static int conn_running; /* we have a [dis]connector running */
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int ttyfd = -1; /* Serial port file descriptor */
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mode_t tty_mode = -1; /* Original access permissions to tty */
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int baud_rate; /* Actual bits/second for serial device */
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int hungup; /* terminal has been hung up */
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int privileged; /* we're running as real uid root */
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int need_holdoff; /* need holdoff period before restarting */
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int phase; /* where the link is at */
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int kill_link;
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int open_ccp_flag;
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int redirect_stderr; /* Connector's stderr should go to file */
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u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
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u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
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static int n_children; /* # child processes still running */
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static int locked; /* lock() has succeeded */
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char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
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/* Prototypes for procedures local to this file. */
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static void cleanup __P((void));
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static void close_tty __P((void));
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static void get_input __P((void));
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static void calltimeout __P((void));
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static struct timeval *timeleft __P((struct timeval *));
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static void kill_my_pg __P((int));
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static void hup __P((int));
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static void term __P((int));
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static void chld __P((int));
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static void toggle_debug __P((int));
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static void open_ccp __P((int));
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static void bad_signal __P((int));
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static void holdoff_end __P((void *));
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static int device_script __P((char *, int, int));
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static void reap_kids __P((void));
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static void pr_log __P((void *, char *, ...));
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extern char *ttyname __P((int));
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extern char *getlogin __P((void));
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int main __P((int, char *[]));
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#ifdef ultrix
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#undef O_NONBLOCK
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#define O_NONBLOCK O_NDELAY
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#endif
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#ifdef ULTRIX
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#define setlogmask(x)
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#endif
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/*
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* PPP Data Link Layer "protocol" table.
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* One entry per supported protocol.
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* The last entry must be NULL.
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*/
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struct protent *protocols[] = {
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&lcp_protent,
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&pap_protent,
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&chap_protent,
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#ifdef CBCP_SUPPORT
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&cbcp_protent,
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#endif
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&ipcp_protent,
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&ccp_protent,
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#ifdef IPX_CHANGE
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&ipxcp_protent,
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#endif
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#ifdef AT_CHANGE
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&atcp_protent,
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#endif
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NULL
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};
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int i, n, nonblock, fdflags;
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struct sigaction sa;
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FILE *pidfile;
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FILE *iffile;
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char *p;
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struct passwd *pw;
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struct timeval timo;
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sigset_t mask;
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struct protent *protp;
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struct stat statbuf;
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phase = PHASE_INITIALIZE;
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p = ttyname(0);
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if (p)
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strcpy(devnam, p);
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strcpy(default_devnam, devnam);
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/* Initialize syslog facilities */
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#ifdef ULTRIX
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openlog("pppd", LOG_PID);
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#else
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openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
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setlogmask(LOG_UPTO(LOG_INFO));
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#endif
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if (gethostname(hostname, MAXNAMELEN) < 0 ) {
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option_error("Couldn't get hostname: %m");
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die(1);
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}
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hostname[MAXNAMELEN-1] = 0;
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uid = getuid();
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privileged = uid == 0;
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/*
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* Initialize to the standard option set, then parse, in order,
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* the system options file, the user's options file,
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* the tty's options file, and the command line arguments.
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*/
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for (i = 0; (protp = protocols[i]) != NULL; ++i)
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(*protp->init)(0);
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progname = *argv;
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if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
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|| !options_from_user())
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exit(1);
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scan_args(argc-1, argv+1); /* look for tty name on command line */
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if (!options_for_tty()
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|| !parse_args(argc-1, argv+1))
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exit(1);
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/*
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* Check that we are running as root.
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*/
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if (geteuid() != 0) {
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option_error("must be root to run %s, since it is not setuid-root",
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argv[0]);
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die(1);
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}
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if (!ppp_available()) {
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option_error(no_ppp_msg);
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exit(1);
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}
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/*
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* Check that the options given are valid and consistent.
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*/
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sys_check_options();
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auth_check_options();
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for (i = 0; (protp = protocols[i]) != NULL; ++i)
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if (protp->check_options != NULL)
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(*protp->check_options)();
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if (demand && connector == 0) {
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option_error("connect script required for demand-dialling\n");
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exit(1);
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}
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/*
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* If the user has specified the default device name explicitly,
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* pretend they hadn't.
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*/
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if (!default_device && strcmp(devnam, default_devnam) == 0)
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default_device = 1;
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redirect_stderr = !nodetach || default_device;
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/*
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* Initialize system-dependent stuff and magic number package.
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*/
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sys_init();
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magic_init();
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if (debug)
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setlogmask(LOG_UPTO(LOG_DEBUG));
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/*
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* Detach ourselves from the terminal, if required,
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* and identify who is running us.
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*/
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if (!default_device && !nodetach && daemon(0, 0) < 0) {
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perror("Couldn't detach from controlling terminal");
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exit(1);
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}
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pid = getpid();
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p = getlogin();
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stime = time((time_t *) NULL);
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if (p == NULL) {
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pw = getpwuid(uid);
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if (pw != NULL && pw->pw_name != NULL)
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p = pw->pw_name;
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else
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p = "(unknown)";
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}
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syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
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VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
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/*
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* Compute mask of all interesting signals and install signal handlers
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* for each. Only one signal handler may be active at a time. Therefore,
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* all other signals should be masked when any handler is executing.
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*/
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sigemptyset(&mask);
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sigaddset(&mask, SIGHUP);
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sigaddset(&mask, SIGINT);
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sigaddset(&mask, SIGTERM);
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sigaddset(&mask, SIGCHLD);
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#define SIGNAL(s, handler) { \
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sa.sa_handler = handler; \
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if (sigaction(s, &sa, NULL) < 0) { \
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syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \
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die(1); \
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} \
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}
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sa.sa_mask = mask;
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sa.sa_flags = 0;
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SIGNAL(SIGHUP, hup); /* Hangup */
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SIGNAL(SIGINT, term); /* Interrupt */
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SIGNAL(SIGTERM, term); /* Terminate */
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SIGNAL(SIGCHLD, chld);
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SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
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SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
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/*
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* Install a handler for other signals which would otherwise
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* cause pppd to exit without cleaning up.
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*/
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SIGNAL(SIGABRT, bad_signal);
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SIGNAL(SIGALRM, bad_signal);
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SIGNAL(SIGFPE, bad_signal);
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SIGNAL(SIGILL, bad_signal);
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SIGNAL(SIGPIPE, bad_signal);
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SIGNAL(SIGQUIT, bad_signal);
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SIGNAL(SIGSEGV, bad_signal);
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#ifdef SIGBUS
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SIGNAL(SIGBUS, bad_signal);
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#endif
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#ifdef SIGEMT
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SIGNAL(SIGEMT, bad_signal);
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#endif
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#ifdef SIGPOLL
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SIGNAL(SIGPOLL, bad_signal);
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#endif
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#ifdef SIGPROF
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SIGNAL(SIGPROF, bad_signal);
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#endif
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#ifdef SIGSYS
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SIGNAL(SIGSYS, bad_signal);
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#endif
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#ifdef SIGTRAP
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SIGNAL(SIGTRAP, bad_signal);
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#endif
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#ifdef SIGVTALRM
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SIGNAL(SIGVTALRM, bad_signal);
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#endif
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#ifdef SIGXCPU
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SIGNAL(SIGXCPU, bad_signal);
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#endif
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#ifdef SIGXFSZ
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SIGNAL(SIGXFSZ, bad_signal);
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#endif
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/*
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* Apparently we can get a SIGPIPE when we call syslog, if
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* syslogd has died and been restarted. Ignoring it seems
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* be sufficient.
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*/
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signal(SIGPIPE, SIG_IGN);
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|
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/*
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* If we're doing dial-on-demand, set up the interface now.
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*/
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if (demand) {
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/*
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* Open the loopback channel and set it up to be the ppp interface.
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*/
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open_ppp_loopback();
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syslog(LOG_INFO, "Using interface ppp%d", ifunit);
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(void) sprintf(ifname, "ppp%d", ifunit);
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/* write pid to file */
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(void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
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if ((pidfile = fopen(pidfilename, "w")) != NULL) {
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fprintf(pidfile, "%d\n", pid);
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(void) fclose(pidfile);
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} else {
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syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename);
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pidfilename[0] = 0;
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}
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/*
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* Configure the interface and mark it up, etc.
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*/
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demand_conf();
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}
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for (;;) {
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need_holdoff = 1;
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|
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if (demand) {
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/*
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* Don't do anything until we see some activity.
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*/
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phase = PHASE_DORMANT;
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kill_link = 0;
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demand_unblock();
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for (;;) {
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wait_loop_output(timeleft(&timo));
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calltimeout();
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if (kill_link) {
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if (!persist)
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die(0);
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kill_link = 0;
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}
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if (get_loop_output())
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break;
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reap_kids();
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}
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|
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/*
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* Now we want to bring up the link.
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*/
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demand_block();
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syslog(LOG_INFO, "Starting link");
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}
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|
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/*
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* Lock the device if we've been asked to.
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*/
|
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if (lockflag && !default_device) {
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if (lock(devnam) < 0)
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goto fail;
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locked = 1;
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}
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|
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/*
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* Open the serial device and set it up to be the ppp interface.
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* First we open it in non-blocking mode so we can set the
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* various termios flags appropriately. If we aren't dialling
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* out and we want to use the modem lines, we reopen it later
|
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* in order to wait for the carrier detect signal from the modem.
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*/
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while ((ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0)) < 0) {
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if (errno != EINTR)
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syslog(LOG_ERR, "Failed to open %s: %m", devnam);
|
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if (!persist || errno != EINTR)
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goto fail;
|
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}
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if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
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|| fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
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syslog(LOG_WARNING,
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"Couldn't reset non-blocking mode on device: %m");
|
|
|
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hungup = 0;
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kill_link = 0;
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|
|
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/*
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* Do the equivalent of `mesg n' to stop broadcast messages.
|
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*/
|
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if (fstat(ttyfd, &statbuf) < 0
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|| fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
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syslog(LOG_WARNING,
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"Couldn't restrict write permissions to %s: %m", devnam);
|
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} else
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tty_mode = statbuf.st_mode;
|
|
|
|
/* run connection script */
|
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if (connector && connector[0]) {
|
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MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
|
|
|
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/* set line speed, flow control, etc.; set CLOCAL for now */
|
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set_up_tty(ttyfd, 1);
|
|
|
|
/* drop dtr to hang up in case modem is off hook */
|
|
if (!default_device && modem) {
|
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setdtr(ttyfd, FALSE);
|
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sleep(1);
|
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setdtr(ttyfd, TRUE);
|
|
}
|
|
|
|
if (device_script(connector, ttyfd, ttyfd) < 0) {
|
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syslog(LOG_ERR, "Connect script failed");
|
|
setdtr(ttyfd, FALSE);
|
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goto fail;
|
|
}
|
|
|
|
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 */
|
|
set_up_tty(ttyfd, 0);
|
|
|
|
/* reopen tty if necessary to wait for carrier */
|
|
if (connector == NULL && modem) {
|
|
while ((i = open(devnam, O_RDWR)) < 0) {
|
|
if (errno != EINTR)
|
|
syslog(LOG_ERR, "Failed to reopen %s: %m", devnam);
|
|
if (!persist || errno != EINTR || hungup || kill_link)
|
|
goto fail;
|
|
}
|
|
close(i);
|
|
}
|
|
|
|
/* run welcome script, if any */
|
|
if (welcomer && welcomer[0]) {
|
|
if (device_script(welcomer, ttyfd, ttyfd) < 0)
|
|
syslog(LOG_WARNING, "Welcome script failed");
|
|
}
|
|
|
|
/* set up the serial device as a ppp interface */
|
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establish_ppp(ttyfd);
|
|
|
|
if (!demand) {
|
|
|
|
syslog(LOG_INFO, "Using interface ppp%d", ifunit);
|
|
(void) sprintf(ifname, "ppp%d", ifunit);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* write interface unit number to file */
|
|
for (n = strlen(devnam); n > 0 ; n--)
|
|
if (devnam[n] == '/') {
|
|
n++;
|
|
break;
|
|
}
|
|
(void) sprintf(iffilename, "%s%s.if", _PATH_VARRUN, &devnam[n]);
|
|
if ((iffile = fopen(iffilename, "w")) != NULL) {
|
|
fprintf(iffile, "ppp%d\n", ifunit);
|
|
(void) fclose(iffile);
|
|
} else {
|
|
syslog(LOG_ERR, "Failed to create if file %s: %m", iffilename);
|
|
iffilename[0] = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Start opening the connection and wait for
|
|
* incoming events (reply, timeout, etc.).
|
|
*/
|
|
syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
|
|
lcp_lowerup(0);
|
|
lcp_open(0); /* Start protocol */
|
|
for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
|
|
wait_input(timeleft(&timo));
|
|
calltimeout();
|
|
get_input();
|
|
if (kill_link) {
|
|
lcp_close(0, "User request");
|
|
kill_link = 0;
|
|
}
|
|
if (open_ccp_flag) {
|
|
if (phase == PHASE_NETWORK) {
|
|
ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
|
|
(*ccp_protent.open)(0);
|
|
}
|
|
open_ccp_flag = 0;
|
|
}
|
|
reap_kids(); /* Don't leave dead kids lying around */
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
clean_check();
|
|
if (demand)
|
|
restore_loop();
|
|
disestablish_ppp(ttyfd);
|
|
|
|
/*
|
|
* Run disconnector script, if requested.
|
|
* XXX we may not be able to do this if the line has hung up!
|
|
*/
|
|
if (disconnector && !hungup) {
|
|
set_up_tty(ttyfd, 1);
|
|
if (device_script(disconnector, ttyfd, ttyfd) < 0) {
|
|
syslog(LOG_WARNING, "disconnect script failed");
|
|
} else {
|
|
syslog(LOG_INFO, "Serial link disconnected.");
|
|
}
|
|
}
|
|
|
|
fail:
|
|
if (ttyfd >= 0)
|
|
close_tty();
|
|
if (locked) {
|
|
unlock();
|
|
locked = 0;
|
|
}
|
|
|
|
if (!demand) {
|
|
if (pidfilename[0] != 0
|
|
&& unlink(pidfilename) < 0 && errno != ENOENT)
|
|
syslog(LOG_WARNING, "unable to delete pid file: %m");
|
|
pidfilename[0] = 0;
|
|
|
|
if (iffile)
|
|
if (unlink(iffilename) < 0 && errno != ENOENT)
|
|
syslog(LOG_WARNING, "unable to delete if file: %m");
|
|
iffilename[0] = 0;
|
|
}
|
|
|
|
if (!persist)
|
|
break;
|
|
|
|
if (demand)
|
|
demand_discard();
|
|
if (holdoff > 0 && need_holdoff) {
|
|
phase = PHASE_HOLDOFF;
|
|
TIMEOUT(holdoff_end, NULL, holdoff);
|
|
do {
|
|
wait_time(timeleft(&timo));
|
|
calltimeout();
|
|
if (kill_link) {
|
|
if (!persist)
|
|
die(0);
|
|
kill_link = 0;
|
|
phase = PHASE_DORMANT; /* allow signal to end holdoff */
|
|
}
|
|
reap_kids();
|
|
} while (phase == PHASE_HOLDOFF);
|
|
}
|
|
}
|
|
|
|
die(0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
static void
|
|
get_input()
|
|
{
|
|
int len, i;
|
|
u_char *p;
|
|
u_short protocol;
|
|
struct protent *protp;
|
|
|
|
p = inpacket_buf; /* point to beginning of packet buffer */
|
|
|
|
len = read_packet(inpacket_buf);
|
|
if (len < 0)
|
|
return;
|
|
|
|
if (len == 0) {
|
|
etime = time((time_t *) NULL);
|
|
minutes = (etime-stime)/60;
|
|
syslog(LOG_NOTICE, "Modem hangup, connected for %d minutes", (minutes >1) ? minutes : 1);
|
|
hungup = 1;
|
|
lcp_lowerdown(0); /* serial link is no longer available */
|
|
link_terminated(0);
|
|
return;
|
|
}
|
|
|
|
if (debug /*&& (debugflags & DBG_INPACKET)*/)
|
|
log_packet(p, len, "rcvd ", LOG_DEBUG);
|
|
|
|
if (len < PPP_HDRLEN) {
|
|
MAINDEBUG((LOG_INFO, "io(): Received short packet."));
|
|
return;
|
|
}
|
|
|
|
p += 2; /* Skip address and control */
|
|
GETSHORT(protocol, p);
|
|
len -= PPP_HDRLEN;
|
|
|
|
/*
|
|
* Toss all non-LCP packets unless LCP is OPEN.
|
|
*/
|
|
if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
|
|
MAINDEBUG((LOG_INFO,
|
|
"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((LOG_INFO, "get_input: discarding proto 0x%x in phase %d",
|
|
protocol, phase));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Upcall the proper protocol input routine.
|
|
*/
|
|
for (i = 0; (protp = protocols[i]) != NULL; ++i) {
|
|
if (protp->protocol == protocol && protp->enabled_flag) {
|
|
(*protp->input)(0, p, len);
|
|
return;
|
|
}
|
|
if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
|
|
&& protp->datainput != NULL) {
|
|
(*protp->datainput)(0, p, len);
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (debug)
|
|
syslog(LOG_WARNING, "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.
|
|
*/
|
|
void
|
|
die(status)
|
|
int status;
|
|
{
|
|
cleanup();
|
|
syslog(LOG_INFO, "Exit.");
|
|
exit(status);
|
|
}
|
|
|
|
/*
|
|
* cleanup - restore anything which needs to be restored before we exit
|
|
*/
|
|
/* ARGSUSED */
|
|
static void
|
|
cleanup()
|
|
{
|
|
sys_cleanup();
|
|
|
|
if (ttyfd >= 0)
|
|
close_tty();
|
|
|
|
if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
|
|
syslog(LOG_WARNING, "unable to delete pid file: %m");
|
|
pidfilename[0] = 0;
|
|
|
|
if (locked)
|
|
unlock();
|
|
}
|
|
|
|
/*
|
|
* close_tty - restore the terminal device and close it.
|
|
*/
|
|
static void
|
|
close_tty()
|
|
{
|
|
disestablish_ppp(ttyfd);
|
|
|
|
/* drop dtr to hang up */
|
|
if (modem) {
|
|
setdtr(ttyfd, FALSE);
|
|
/*
|
|
* 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(ttyfd);
|
|
|
|
if (tty_mode != (mode_t) -1)
|
|
chmod(devnam, tty_mode);
|
|
|
|
close(ttyfd);
|
|
ttyfd = -1;
|
|
}
|
|
|
|
|
|
struct callout {
|
|
struct timeval c_time; /* time at which to call routine */
|
|
void *c_arg; /* argument to routine */
|
|
void (*c_func) __P((void *)); /* routine */
|
|
struct callout *c_next;
|
|
};
|
|
|
|
static struct callout *callout = NULL; /* Callout list */
|
|
static struct timeval timenow; /* Current time */
|
|
|
|
/*
|
|
* timeout - Schedule a timeout.
|
|
*
|
|
* Note that this timeout takes the number of seconds, NOT hz (as in
|
|
* the kernel).
|
|
*/
|
|
void
|
|
timeout(func, arg, time)
|
|
void (*func) __P((void *));
|
|
void *arg;
|
|
int time;
|
|
{
|
|
struct callout *newp, *p, **pp;
|
|
|
|
MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.",
|
|
(long) func, (long) arg, time));
|
|
|
|
/*
|
|
* Allocate timeout.
|
|
*/
|
|
if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
|
|
syslog(LOG_ERR, "Out of memory in timeout()!");
|
|
die(1);
|
|
}
|
|
newp->c_arg = arg;
|
|
newp->c_func = func;
|
|
gettimeofday(&timenow, NULL);
|
|
newp->c_time.tv_sec = timenow.tv_sec + time;
|
|
newp->c_time.tv_usec = timenow.tv_usec;
|
|
|
|
/*
|
|
* Find correct place and link it in.
|
|
*/
|
|
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))
|
|
break;
|
|
newp->c_next = p;
|
|
*pp = newp;
|
|
}
|
|
|
|
|
|
/*
|
|
* untimeout - Unschedule a timeout.
|
|
*/
|
|
void
|
|
untimeout(func, arg)
|
|
void (*func) __P((void *));
|
|
void *arg;
|
|
{
|
|
struct callout **copp, *freep;
|
|
|
|
MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg));
|
|
|
|
/*
|
|
* Find first matching timeout and remove it from the list.
|
|
*/
|
|
for (copp = &callout; (freep = *copp); copp = &freep->c_next)
|
|
if (freep->c_func == func && freep->c_arg == arg) {
|
|
*copp = freep->c_next;
|
|
(void) free((char *) freep);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* calltimeout - Call any timeout routines which are now due.
|
|
*/
|
|
static void
|
|
calltimeout()
|
|
{
|
|
struct callout *p;
|
|
|
|
while (callout != NULL) {
|
|
p = callout;
|
|
|
|
if (gettimeofday(&timenow, NULL) < 0) {
|
|
syslog(LOG_ERR, "Failed to get time of day: %m");
|
|
die(1);
|
|
}
|
|
if (!(p->c_time.tv_sec < timenow.tv_sec
|
|
|| (p->c_time.tv_sec == timenow.tv_sec
|
|
&& p->c_time.tv_usec <= timenow.tv_usec)))
|
|
break; /* no, it's not time yet */
|
|
|
|
callout = p->c_next;
|
|
(*p->c_func)(p->c_arg);
|
|
|
|
free((char *) p);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* timeleft - return the length of time until the next timeout is due.
|
|
*/
|
|
static struct timeval *
|
|
timeleft(tvp)
|
|
struct timeval *tvp;
|
|
{
|
|
if (callout == NULL)
|
|
return NULL;
|
|
|
|
gettimeofday(&timenow, NULL);
|
|
tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
|
|
tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
|
|
if (tvp->tv_usec < 0) {
|
|
tvp->tv_usec += 1000000;
|
|
tvp->tv_sec -= 1;
|
|
}
|
|
if (tvp->tv_sec < 0)
|
|
tvp->tv_sec = tvp->tv_usec = 0;
|
|
|
|
return tvp;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* Indicates that the physical layer has been disconnected.
|
|
* We don't rely on this indication; if the user has sent this
|
|
* signal, we just take the link down.
|
|
*/
|
|
static void
|
|
hup(sig)
|
|
int sig;
|
|
{
|
|
syslog(LOG_INFO, "Hangup (SIGHUP)");
|
|
kill_link = 1;
|
|
if (conn_running)
|
|
/* Send the signal to the [dis]connector process(es) also */
|
|
kill_my_pg(sig);
|
|
}
|
|
|
|
|
|
/*
|
|
* term - Catch SIGTERM signal and SIGINT signal (^C/del).
|
|
*
|
|
* Indicates that we should initiate a graceful disconnect and exit.
|
|
*/
|
|
/*ARGSUSED*/
|
|
static void
|
|
term(sig)
|
|
int sig;
|
|
{
|
|
syslog(LOG_INFO, "Terminating on signal %d.", sig);
|
|
persist = 0; /* don't try to restart */
|
|
kill_link = 1;
|
|
if (conn_running)
|
|
/* Send the signal to the [dis]connector process(es) also */
|
|
kill_my_pg(sig);
|
|
}
|
|
|
|
|
|
/*
|
|
* chld - Catch SIGCHLD signal.
|
|
* Calls reap_kids to get status for any dead kids.
|
|
*/
|
|
static void
|
|
chld(sig)
|
|
int sig;
|
|
{
|
|
reap_kids();
|
|
}
|
|
|
|
|
|
/*
|
|
* toggle_debug - Catch SIGUSR1 signal.
|
|
*
|
|
* Toggle debug flag.
|
|
*/
|
|
/*ARGSUSED*/
|
|
static void
|
|
toggle_debug(sig)
|
|
int sig;
|
|
{
|
|
debug = !debug;
|
|
if (debug) {
|
|
setlogmask(LOG_UPTO(LOG_DEBUG));
|
|
} else {
|
|
setlogmask(LOG_UPTO(LOG_WARNING));
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* open_ccp - Catch SIGUSR2 signal.
|
|
*
|
|
* Try to (re)negotiate compression.
|
|
*/
|
|
/*ARGSUSED*/
|
|
static void
|
|
open_ccp(sig)
|
|
int sig;
|
|
{
|
|
open_ccp_flag = 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* bad_signal - We've caught a fatal signal. Clean up state and exit.
|
|
*/
|
|
static void
|
|
bad_signal(sig)
|
|
int sig;
|
|
{
|
|
syslog(LOG_ERR, "Fatal signal %d", sig);
|
|
if (conn_running)
|
|
kill_my_pg(SIGTERM);
|
|
die(1);
|
|
}
|
|
|
|
|
|
/*
|
|
* device_script - run a program to connect or disconnect the
|
|
* serial device.
|
|
*/
|
|
static int
|
|
device_script(program, in, out)
|
|
char *program;
|
|
int in, out;
|
|
{
|
|
int pid;
|
|
int status;
|
|
int errfd;
|
|
|
|
conn_running = 1;
|
|
pid = fork();
|
|
|
|
if (pid < 0) {
|
|
conn_running = 0;
|
|
syslog(LOG_ERR, "Failed to create child process: %m");
|
|
die(1);
|
|
}
|
|
|
|
if (pid == 0) {
|
|
sys_close();
|
|
closelog();
|
|
if (in == out) {
|
|
if (in != 0) {
|
|
dup2(in, 0);
|
|
close(in);
|
|
}
|
|
dup2(0, 1);
|
|
} else {
|
|
if (out == 0)
|
|
out = dup(out);
|
|
if (in != 0) {
|
|
dup2(in, 0);
|
|
close(in);
|
|
}
|
|
if (out != 1) {
|
|
dup2(out, 1);
|
|
close(out);
|
|
}
|
|
}
|
|
if (redirect_stderr) {
|
|
close(2);
|
|
errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0644);
|
|
if (errfd >= 0 && errfd != 2) {
|
|
dup2(errfd, 2);
|
|
close(errfd);
|
|
}
|
|
}
|
|
setuid(getuid());
|
|
setgid(getgid());
|
|
execl("/bin/sh", "sh", "-c", program, (char *)0);
|
|
syslog(LOG_ERR, "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);
|
|
}
|
|
conn_running = 0;
|
|
|
|
return (status == 0 ? 0 : -1);
|
|
}
|
|
|
|
|
|
/*
|
|
* run-program - execute a program with given arguments,
|
|
* but don't wait for it.
|
|
* If the program can't be executed, logs an error unless
|
|
* must_exist is 0 and the program file doesn't exist.
|
|
*/
|
|
int
|
|
run_program(prog, args, must_exist)
|
|
char *prog;
|
|
char **args;
|
|
int must_exist;
|
|
{
|
|
int pid;
|
|
char *nullenv[1];
|
|
|
|
pid = fork();
|
|
if (pid == -1) {
|
|
syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
|
|
return -1;
|
|
}
|
|
if (pid == 0) {
|
|
int new_fd;
|
|
|
|
/* Leave the current location */
|
|
(void) setsid(); /* No controlling tty. */
|
|
(void) umask (S_IRWXG|S_IRWXO);
|
|
(void) chdir ("/"); /* no current directory. */
|
|
setuid(geteuid());
|
|
setgid(getegid());
|
|
|
|
/* Ensure that nothing of our device environment is inherited. */
|
|
sys_close();
|
|
closelog();
|
|
close (0);
|
|
close (1);
|
|
close (2);
|
|
close (ttyfd); /* tty interface to the ppp device */
|
|
|
|
/* Don't pass handles to the PPP device, even by accident. */
|
|
new_fd = open (_PATH_DEVNULL, O_RDWR);
|
|
if (new_fd >= 0) {
|
|
if (new_fd != 0) {
|
|
dup2 (new_fd, 0); /* stdin <- /dev/null */
|
|
close (new_fd);
|
|
}
|
|
dup2 (0, 1); /* stdout -> /dev/null */
|
|
dup2 (0, 2); /* stderr -> /dev/null */
|
|
}
|
|
|
|
#ifdef BSD
|
|
/* Force the priority back to zero if pppd is running higher. */
|
|
if (setpriority (PRIO_PROCESS, 0, 0) < 0)
|
|
syslog (LOG_WARNING, "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);
|
|
_exit(-1);
|
|
}
|
|
MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
|
|
++n_children;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* reap_kids - get status from any dead child processes,
|
|
* and log a message for abnormal terminations.
|
|
*/
|
|
static void
|
|
reap_kids()
|
|
{
|
|
int pid, status;
|
|
|
|
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) {
|
|
--n_children;
|
|
if (WIFSIGNALED(status)) {
|
|
syslog(LOG_WARNING, "Child process %d terminated with signal %d",
|
|
pid, WTERMSIG(status));
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* log_packet - format a packet and log it.
|
|
*/
|
|
|
|
char line[256]; /* line to be logged accumulated here */
|
|
char *linep;
|
|
|
|
void
|
|
log_packet(p, len, prefix, level)
|
|
u_char *p;
|
|
int len;
|
|
char *prefix;
|
|
int level;
|
|
{
|
|
strcpy(line, prefix);
|
|
linep = line + strlen(line);
|
|
format_packet(p, len, pr_log, NULL);
|
|
if (linep != line)
|
|
syslog(level, "%s", line);
|
|
}
|
|
|
|
/*
|
|
* format_packet - make a readable representation of a packet,
|
|
* calling `printer(arg, format, ...)' to output it.
|
|
*/
|
|
void
|
|
format_packet(p, len, printer, arg)
|
|
u_char *p;
|
|
int len;
|
|
void (*printer) __P((void *, char *, ...));
|
|
void *arg;
|
|
{
|
|
int i, n;
|
|
u_short proto;
|
|
u_char x;
|
|
struct protent *protp;
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
for (; len > 0; --len) {
|
|
GETCHAR(x, p);
|
|
printer(arg, " %.2x", x);
|
|
}
|
|
}
|
|
|
|
static void
|
|
pr_log __V((void *arg, char *fmt, ...))
|
|
{
|
|
int n;
|
|
va_list pvar;
|
|
char buf[256];
|
|
|
|
#if __STDC__
|
|
va_start(pvar, fmt);
|
|
#else
|
|
void *arg;
|
|
char *fmt;
|
|
va_start(pvar);
|
|
arg = va_arg(pvar, void *);
|
|
fmt = va_arg(pvar, char *);
|
|
#endif
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* print_string - print a readable representation of a string using
|
|
* printer.
|
|
*/
|
|
void
|
|
print_string(p, len, printer, arg)
|
|
char *p;
|
|
int len;
|
|
void (*printer) __P((void *, char *, ...));
|
|
void *arg;
|
|
{
|
|
int c;
|
|
|
|
printer(arg, "\"");
|
|
for (; len > 0; --len) {
|
|
c = *p++;
|
|
if (' ' <= c && c <= '~') {
|
|
if (c == '\\' || c == '"')
|
|
printer(arg, "\\");
|
|
printer(arg, "%c", c);
|
|
} else {
|
|
switch (c) {
|
|
case '\n':
|
|
printer(arg, "\\n");
|
|
break;
|
|
case '\r':
|
|
printer(arg, "\\r");
|
|
break;
|
|
case '\t':
|
|
printer(arg, "\\t");
|
|
break;
|
|
default:
|
|
printer(arg, "\\%.3o", c);
|
|
}
|
|
}
|
|
}
|
|
printer(arg, "\"");
|
|
}
|
|
|
|
/*
|
|
* novm - log an error message saying we ran out of memory, and die.
|
|
*/
|
|
void
|
|
novm(msg)
|
|
char *msg;
|
|
{
|
|
syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);
|
|
die(1);
|
|
}
|
|
|
|
/*
|
|
* fmtmsg - format a message into a buffer. Like sprintf except we
|
|
* also specify the length of the output buffer, and we handle
|
|
* %r (recursive format), %m (error message) and %I (IP address) formats.
|
|
* Doesn't do floating-point formats.
|
|
* Returns the number of chars put into buf.
|
|
*/
|
|
int
|
|
fmtmsg __V((char *buf, int buflen, char *fmt, ...))
|
|
{
|
|
va_list args;
|
|
int n;
|
|
|
|
#if __STDC__
|
|
va_start(args, fmt);
|
|
#else
|
|
char *buf;
|
|
int buflen;
|
|
char *fmt;
|
|
va_start(args);
|
|
buf = va_arg(args, char *);
|
|
buflen = va_arg(args, int);
|
|
fmt = va_arg(args, char *);
|
|
#endif
|
|
n = vfmtmsg(buf, buflen, fmt, args);
|
|
va_end(args);
|
|
return n;
|
|
}
|
|
|
|
/*
|
|
* vfmtmsg - like fmtmsg, takes a va_list instead of a list of args.
|
|
*/
|
|
#define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
|
|
|
|
int
|
|
vfmtmsg(buf, buflen, fmt, args)
|
|
char *buf;
|
|
int buflen;
|
|
char *fmt;
|
|
va_list args;
|
|
{
|
|
int c, i, n;
|
|
int width, prec, fillch;
|
|
int base, len, neg, quoted;
|
|
unsigned long val = 0;
|
|
char *str, *f, *buf0;
|
|
unsigned char *p;
|
|
char num[32];
|
|
time_t t;
|
|
static char hexchars[] = "0123456789abcdef";
|
|
|
|
buf0 = buf;
|
|
--buflen;
|
|
while (buflen > 0) {
|
|
for (f = fmt; *f != '%' && *f != 0; ++f)
|
|
;
|
|
if (f > fmt) {
|
|
len = f - fmt;
|
|
if (len > buflen)
|
|
len = buflen;
|
|
memcpy(buf, fmt, len);
|
|
buf += len;
|
|
buflen -= len;
|
|
fmt = f;
|
|
}
|
|
if (*fmt == 0)
|
|
break;
|
|
c = *++fmt;
|
|
width = prec = 0;
|
|
fillch = ' ';
|
|
if (c == '0') {
|
|
fillch = '0';
|
|
c = *++fmt;
|
|
}
|
|
if (c == '*') {
|
|
width = va_arg(args, int);
|
|
c = *++fmt;
|
|
} else {
|
|
while (isdigit(c)) {
|
|
width = width * 10 + c - '0';
|
|
c = *++fmt;
|
|
}
|
|
}
|
|
if (c == '.') {
|
|
c = *++fmt;
|
|
if (c == '*') {
|
|
prec = va_arg(args, int);
|
|
c = *++fmt;
|
|
} else {
|
|
while (isdigit(c)) {
|
|
prec = prec * 10 + c - '0';
|
|
c = *++fmt;
|
|
}
|
|
}
|
|
}
|
|
str = 0;
|
|
base = 0;
|
|
neg = 0;
|
|
++fmt;
|
|
switch (c) {
|
|
case 'd':
|
|
i = va_arg(args, int);
|
|
if (i < 0) {
|
|
neg = 1;
|
|
val = -i;
|
|
} else
|
|
val = i;
|
|
base = 10;
|
|
break;
|
|
case 'o':
|
|
val = va_arg(args, unsigned int);
|
|
base = 8;
|
|
break;
|
|
case 'x':
|
|
val = va_arg(args, unsigned int);
|
|
base = 16;
|
|
break;
|
|
case 'p':
|
|
val = (unsigned long) va_arg(args, void *);
|
|
base = 16;
|
|
neg = 2;
|
|
break;
|
|
case 's':
|
|
str = va_arg(args, char *);
|
|
break;
|
|
case 'c':
|
|
num[0] = va_arg(args, int);
|
|
num[1] = 0;
|
|
str = num;
|
|
break;
|
|
case 'm':
|
|
str = strerror(errno);
|
|
break;
|
|
case 'I':
|
|
str = ip_ntoa(va_arg(args, u_int32_t));
|
|
break;
|
|
case 'r':
|
|
f = va_arg(args, char *);
|
|
#ifndef __powerpc__
|
|
n = vfmtmsg(buf, buflen + 1, f, va_arg(args, va_list));
|
|
#else
|
|
/* On the powerpc, a va_list is an array of 1 structure */
|
|
n = vfmtmsg(buf, buflen + 1, f, va_arg(args, void *));
|
|
#endif
|
|
buf += n;
|
|
buflen -= n;
|
|
continue;
|
|
case 't':
|
|
time(&t);
|
|
str = ctime(&t);
|
|
str += 4; /* chop off the day name */
|
|
str[15] = 0; /* chop off year and newline */
|
|
break;
|
|
case 'v': /* "visible" string */
|
|
case 'q': /* quoted string */
|
|
quoted = c == 'q';
|
|
p = va_arg(args, unsigned char *);
|
|
if (fillch == '0' && prec > 0) {
|
|
n = prec;
|
|
} else {
|
|
n = strlen((char *)p);
|
|
if (prec > 0 && prec < n)
|
|
n = prec;
|
|
}
|
|
while (n > 0 && buflen > 0) {
|
|
c = *p++;
|
|
--n;
|
|
if (!quoted && c >= 0x80) {
|
|
OUTCHAR('M');
|
|
OUTCHAR('-');
|
|
c -= 0x80;
|
|
}
|
|
if (quoted && (c == '"' || c == '\\'))
|
|
OUTCHAR('\\');
|
|
if (c < 0x20 || (0x7f <= c && c < 0xa0)) {
|
|
if (quoted) {
|
|
OUTCHAR('\\');
|
|
switch (c) {
|
|
case '\t': OUTCHAR('t'); break;
|
|
case '\n': OUTCHAR('n'); break;
|
|
case '\b': OUTCHAR('b'); break;
|
|
case '\f': OUTCHAR('f'); break;
|
|
default:
|
|
OUTCHAR('x');
|
|
OUTCHAR(hexchars[c >> 4]);
|
|
OUTCHAR(hexchars[c & 0xf]);
|
|
}
|
|
} else {
|
|
if (c == '\t')
|
|
OUTCHAR(c);
|
|
else {
|
|
OUTCHAR('^');
|
|
OUTCHAR(c ^ 0x40);
|
|
}
|
|
}
|
|
} else
|
|
OUTCHAR(c);
|
|
}
|
|
continue;
|
|
default:
|
|
*buf++ = '%';
|
|
if (c != '%')
|
|
--fmt; /* so %z outputs %z etc. */
|
|
--buflen;
|
|
continue;
|
|
}
|
|
if (base != 0) {
|
|
str = num + sizeof(num);
|
|
*--str = 0;
|
|
while (str > num + neg) {
|
|
*--str = hexchars[val % base];
|
|
val = val / base;
|
|
if (--prec <= 0 && val == 0)
|
|
break;
|
|
}
|
|
switch (neg) {
|
|
case 1:
|
|
*--str = '-';
|
|
break;
|
|
case 2:
|
|
*--str = 'x';
|
|
*--str = '0';
|
|
break;
|
|
}
|
|
len = num + sizeof(num) - 1 - str;
|
|
} else {
|
|
len = strlen(str);
|
|
if (prec > 0 && len > prec)
|
|
len = prec;
|
|
}
|
|
if (width > 0) {
|
|
if (width > buflen)
|
|
width = buflen;
|
|
if ((n = width - len) > 0) {
|
|
buflen -= n;
|
|
for (; n > 0; --n)
|
|
*buf++ = fillch;
|
|
}
|
|
}
|
|
if (len > buflen)
|
|
len = buflen;
|
|
memcpy(buf, str, len);
|
|
buf += len;
|
|
buflen -= len;
|
|
}
|
|
*buf = 0;
|
|
return buf - buf0;
|
|
}
|