1448 lines
31 KiB
C
1448 lines
31 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 1.2 1994/09/25 02:32:07 wollman Exp $";
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#endif
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#define SETSID
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#include <stdio.h>
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#include <string.h>
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#include <signal.h>
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#include <unistd.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/wait.h>
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/*
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* If REQ_SYSOPTIONS is defined to 1, pppd will not run unless
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* /etc/ppp/options exists.
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*/
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#ifndef REQ_SYSOPTIONS
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#define REQ_SYSOPTIONS 1
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#endif
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#ifdef SGTTY
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#include <sgtty.h>
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#else
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#ifndef sun
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#include <sys/ioctl.h>
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#endif
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#include <termios.h>
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#endif
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <net/if.h>
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#include "callout.h"
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#include "ppp.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 "pppd.h"
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#include "pathnames.h"
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#include "patchlevel.h"
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#ifndef TRUE
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#define TRUE (1)
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#endif /*TRUE*/
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#ifndef FALSE
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#define FALSE (0)
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#endif /*FALSE*/
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#ifdef PIDPATH
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static char *pidpath = PIDPATH; /* filename in which pid will be stored */
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#else
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static char *pidpath = _PATH_PIDFILE;
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#endif /* PIDFILE */
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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 *username;
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char hostname[MAXNAMELEN]; /* Our hostname */
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char our_name[MAXNAMELEN];
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char remote_name[MAXNAMELEN];
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static char pidfilename[MAXPATHLEN];
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static pid_t pid; /* Our pid */
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static pid_t pgrpid; /* Process Group ID */
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uid_t uid; /* Our real user-id */
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gid_t gid;
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char devname[MAXPATHLEN] = "/dev/tty"; /* Device name */
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int default_device = TRUE; /* use default device (stdin/out) */
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int fd = -1; /* Device file descriptor */
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int s; /* Socket file descriptor */
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int phase; /* where the link is at */
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#ifdef SGTTY
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static struct sgttyb initsgttyb; /* Initial TTY sgttyb */
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#else
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static struct termios inittermios; /* Initial TTY termios */
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#endif
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static int initfdflags = -1; /* Initial file descriptor flags */
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static int restore_term; /* 1 => we've munged the terminal */
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u_char outpacket_buf[MTU+DLLHEADERLEN]; /* buffer for outgoing packet */
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static u_char inpacket_buf[MTU+DLLHEADERLEN]; /* buffer for incoming packet */
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int hungup; /* terminal has been hung up */
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static int n_children; /* # child processes still running */
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/* configured variables */
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int debug = 0; /* Debug flag */
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int kdebugflag = 0; /* Kernel debugging flag */
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char user[MAXNAMELEN]; /* username for PAP */
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char passwd[MAXSECRETLEN]; /* password for PAP */
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char *connector = NULL; /* "connect" command */
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char *disconnector = NULL; /* "disconnect" command */
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int inspeed = 0; /* Input/Output speed requested */
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int baud_rate; /* bits/sec currently used */
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u_long netmask = 0; /* netmask to use on ppp interface */
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int crtscts = 0; /* use h/w flow control */
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int nodetach = 0; /* don't fork */
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int modem = 0; /* use modem control lines */
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int auth_required = 0; /* require peer to authenticate */
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int defaultroute = 0; /* assign default route through interface */
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int proxyarp = 0; /* set entry in arp table */
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int persist = 0; /* re-initiate on termination */
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int answer = 0; /* wait for incoming call */
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int uselogin = 0; /* check PAP info against /etc/passwd */
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int lockflag = 0; /* lock the serial device */
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/* prototypes */
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static void hup __ARGS((int));
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static void intr __ARGS((int));
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static void term __ARGS((int));
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static void alrm __ARGS((int));
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static void io __ARGS((int));
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static void chld __ARGS((int));
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static void incdebug __ARGS((int));
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static void nodebug __ARGS((int));
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void establish_ppp __ARGS((void));
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void reap_kids __ARGS((void));
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void cleanup __ARGS((int, caddr_t));
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void die __ARGS((int));
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void novm __ARGS((char *));
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void log_packet __ARGS((u_char *, int, char *));
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void format_packet __ARGS((u_char *, int,
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void (*) (void *, char *, ...), void *));
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void pr_log __ARGS((void *, char *, ...));
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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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*/
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static struct protent {
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u_short protocol;
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void (*init)();
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void (*input)();
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void (*protrej)();
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int (*printpkt)();
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char *name;
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} prottbl[] = {
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{ LCP, lcp_init, lcp_input, lcp_protrej, lcp_printpkt, "LCP" },
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{ IPCP, ipcp_init, ipcp_input, ipcp_protrej, ipcp_printpkt, "IPCP" },
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{ UPAP, upap_init, upap_input, upap_protrej, upap_printpkt, "PAP" },
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{ CHAP, ChapInit, ChapInput, ChapProtocolReject, ChapPrintPkt, "CHAP" },
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};
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#define N_PROTO (sizeof(prottbl) / sizeof(prottbl[0]))
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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 mask, i;
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struct sigaction sa;
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struct cmd *cmdp;
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FILE *pidfile;
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char *p;
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struct passwd *pw;
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p = ttyname(0);
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if (p)
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strcpy(devname, p);
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if (gethostname(hostname, MAXNAMELEN) < 0 ) {
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perror("couldn't get hostname");
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die(1);
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}
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hostname[MAXNAMELEN-1] = 0;
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pid = getpid();
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uid = getuid();
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gid = getgid();
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if (!ppp_available()) {
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fprintf(stderr, "Sorry - PPP is not available on this system\n");
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exit(1);
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}
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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, and the command
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* line arguments.
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*/
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for (i = 0; i < N_PROTO; i++)
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(*prottbl[i].init)(0);
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progname = *argv;
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if (!options_from_file(_PATH_SYSOPTIONS, REQ_SYSOPTIONS, 0) ||
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!options_from_user() ||
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!parse_args(argc-1, argv+1) ||
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!options_for_tty())
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die(1);
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check_auth_options();
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setipdefault();
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/*
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* Initialize syslog system and magic number package.
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*/
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#if !defined(ultrix)
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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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#else
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openlog("pppd", LOG_PID);
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#define LOG_UPTO(x) (x)
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#define setlogmask(x) (x)
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#endif
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if (debug)
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setlogmask(LOG_UPTO(LOG_DEBUG));
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magic_init();
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username = getlogin();
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if (username == NULL) {
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pw = getpwuid(uid);
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if (pw != NULL && pw->pw_name != NULL)
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username = pw->pw_name;
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else
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username = "(unknown)";
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}
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syslog(LOG_NOTICE, "pppd %s.%d started by %s, uid %d",
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VERSION, PATCHLEVEL, username, uid);
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#ifdef SETSID
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/*
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* Make sure we can set the serial device to be our controlling terminal.
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*/
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if (default_device) {
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/*
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* No device name was specified:
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* we are in the device's session already.
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*/
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if ((pgrpid = getpgrp()) < 0) {
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syslog(LOG_ERR, "getpgrp(): %m");
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die(1);
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}
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} else {
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/*
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* Not default device: make sure we're not a process group leader,
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* then become session leader of a new session (so we can make
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* our device its controlling terminal and thus get SIGHUPs).
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*/
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if (!nodetach) {
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/* fork so we're not a process group leader */
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if (pid = fork()) {
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exit(0); /* parent is finished */
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}
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if (pid < 0) {
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syslog(LOG_ERR, "fork: %m");
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die(1);
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}
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pid = getpid(); /* otherwise pid is 0 in child */
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} else {
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/*
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* try to put ourself into our parent's process group,
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* so we're not a process group leader
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*/
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if (setpgrp(pid, getppid()) < 0)
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syslog(LOG_WARNING, "setpgrp: %m");
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}
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/* create new session */
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if ((pgrpid = setsid()) < 0) {
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syslog(LOG_ERR, "setsid(): %m");
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die(1);
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}
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}
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#endif
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if (lockflag && !default_device)
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if (lock(devname) < 0)
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die(1);
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/* Get an internet socket for doing socket ioctl's on. */
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if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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syslog(LOG_ERR, "socket : %m");
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die(1);
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}
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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, SIGALRM);
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sigaddset(&mask, SIGIO);
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sigaddset(&mask, SIGCHLD);
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#ifdef STREAMS
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sigaddset(&mask, SIGPOLL);
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#endif
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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, "sigaction(%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, intr); /* Interrupt */
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SIGNAL(SIGTERM, term); /* Terminate */
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SIGNAL(SIGALRM, alrm); /* Timeout */
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SIGNAL(SIGIO, io); /* Input available */
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SIGNAL(SIGCHLD, chld); /* Death of child process */
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#ifdef STREAMS
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SIGNAL(SIGPOLL, io); /* Input available */
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#endif
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signal(SIGUSR1, incdebug); /* Increment debug flag */
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signal(SIGUSR2, nodebug); /* Reset debug flag */
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/*
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* Block SIGIOs and SIGPOLLs for now
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*/
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sigemptyset(&mask);
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sigaddset(&mask, SIGIO);
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#ifdef STREAMS
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sigaddset(&mask, SIGPOLL);
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#endif
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sigprocmask(SIG_BLOCK, &mask, NULL);
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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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*/
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if ((fd = open(devname, O_RDWR /*| O_NDELAY*/)) < 0) {
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syslog(LOG_ERR, "open(%s): %m", devname);
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die(1);
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}
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hungup = 0;
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#ifdef TIOCSCTTY
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/* set device to be controlling tty */
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if (!default_device && ioctl(fd, TIOCSCTTY) < 0) {
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syslog(LOG_ERR, "ioctl(TIOCSCTTY): %m");
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die(1);
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}
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#endif /* TIOCSCTTY */
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/* run connection script */
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if (connector) {
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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(fd, 1);
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/* drop dtr to hang up in case modem is off hook */
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if (!default_device && modem) {
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setdtr(fd, FALSE);
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sleep(1);
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setdtr(fd, TRUE);
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}
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if (device_script(connector, fd, fd) < 0) {
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syslog(LOG_ERR, "could not set up connection");
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setdtr(fd, FALSE);
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die(1);
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}
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syslog(LOG_INFO, "Connected...");
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sleep(1); /* give it time to set up its terminal */
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}
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/* set line speed, flow control, etc.; clear CLOCAL if modem option */
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set_up_tty(fd, 0);
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/* set up the serial device as a ppp interface */
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establish_ppp();
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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", pidpath, 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, "unable to create pid file: %m");
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pidfilename[0] = 0;
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}
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/*
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* Set process group of device to our process group so we can get
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* SIGIOs and SIGHUPs.
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*/
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#ifdef SETSID
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if (default_device) {
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int id = tcgetpgrp(fd);
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if (id != pgrpid) {
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syslog(LOG_WARNING, "warning: not in tty's process group");
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}
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} else {
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if (tcsetpgrp(fd, pgrpid) < 0) {
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syslog(LOG_ERR, "tcsetpgrp(): %m");
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die(1);
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}
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}
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#else
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/* set process group on tty so we get SIGIO's */
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if (ioctl(fd, TIOCSPGRP, &pgrpid) < 0) {
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syslog(LOG_ERR, "ioctl(TIOCSPGRP): %m");
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die(1);
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}
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#endif
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/*
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* Record initial device flags, then set device to cause SIGIO
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* signals to be generated.
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*/
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if ((initfdflags = fcntl(fd, F_GETFL)) == -1) {
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syslog(LOG_ERR, "fcntl(F_GETFL): %m");
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die(1);
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}
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#ifdef _linux_ /* This is a kludge for Linux. FIXME !!! -- later. */
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#undef FASYNC
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#define FASYNC 0
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#endif
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if (fcntl(fd, F_SETFL, FNDELAY | FASYNC) == -1) {
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syslog(LOG_ERR, "fcntl(F_SETFL, FNDELAY | FASYNC): %m");
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die(1);
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}
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/*
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* Block all signals, start opening the connection, and wait for
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* incoming signals (reply, timeout, etc.).
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*/
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syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devname);
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sigprocmask(SIG_BLOCK, &mask, NULL); /* Block signals now */
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lcp_lowerup(0); /* XXX Well, sort of... */
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lcp_open(0); /* Start protocol */
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for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; )
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sigpause(0); /* Wait for next signal */
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/*
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* Run disconnector script, if requested
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*/
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if (disconnector) {
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if (device_script(disconnector, fd, fd) < 0) {
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syslog(LOG_WARNING, "disconnect script failed");
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die(1);
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}
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syslog(LOG_INFO, "Disconnected...");
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}
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quit();
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}
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#if B9600 == 9600
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/*
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* XXX assume speed_t values numerically equal bits per second
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* (so we can ask for any speed).
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*/
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#define translate_speed(bps) (bps)
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#define baud_rate_of(speed) (speed)
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#else
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/*
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* List of valid speeds.
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*/
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struct speed {
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int speed_int, speed_val;
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} speeds[] = {
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#ifdef B50
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{ 50, B50 },
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#endif
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#ifdef B75
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{ 75, B75 },
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#endif
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#ifdef B110
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{ 110, B110 },
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#endif
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#ifdef B134
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{ 134, B134 },
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#endif
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#ifdef B150
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{ 150, B150 },
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#endif
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#ifdef B200
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{ 200, B200 },
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#endif
|
|
#ifdef B300
|
|
{ 300, B300 },
|
|
#endif
|
|
#ifdef B600
|
|
{ 600, B600 },
|
|
#endif
|
|
#ifdef B1200
|
|
{ 1200, B1200 },
|
|
#endif
|
|
#ifdef B1800
|
|
{ 1800, B1800 },
|
|
#endif
|
|
#ifdef B2000
|
|
{ 2000, B2000 },
|
|
#endif
|
|
#ifdef B2400
|
|
{ 2400, B2400 },
|
|
#endif
|
|
#ifdef B3600
|
|
{ 3600, B3600 },
|
|
#endif
|
|
#ifdef B4800
|
|
{ 4800, B4800 },
|
|
#endif
|
|
#ifdef B7200
|
|
{ 7200, B7200 },
|
|
#endif
|
|
#ifdef B9600
|
|
{ 9600, B9600 },
|
|
#endif
|
|
#ifdef B19200
|
|
{ 19200, B19200 },
|
|
#endif
|
|
#ifdef B38400
|
|
{ 38400, B38400 },
|
|
#endif
|
|
#ifdef EXTA
|
|
{ 19200, EXTA },
|
|
#endif
|
|
#ifdef EXTB
|
|
{ 38400, EXTB },
|
|
#endif
|
|
#ifdef B57600
|
|
{ 57600, B57600 },
|
|
#endif
|
|
#ifdef B115200
|
|
{ 115200, B115200 },
|
|
#endif
|
|
{ 0, 0 }
|
|
};
|
|
|
|
/*
|
|
* Translate from bits/second to a speed_t.
|
|
*/
|
|
int
|
|
translate_speed(bps)
|
|
int bps;
|
|
{
|
|
struct speed *speedp;
|
|
|
|
if (bps == 0)
|
|
return 0;
|
|
for (speedp = speeds; speedp->speed_int; speedp++)
|
|
if (bps == speedp->speed_int)
|
|
return speedp->speed_val;
|
|
syslog(LOG_WARNING, "speed %d not supported", bps);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Translate from a speed_t to bits/second.
|
|
*/
|
|
int
|
|
baud_rate_of(speed)
|
|
int speed;
|
|
{
|
|
struct speed *speedp;
|
|
|
|
if (speed == 0)
|
|
return 0;
|
|
for (speedp = speeds; speedp->speed_int; speedp++)
|
|
if (speed == speedp->speed_val)
|
|
return speedp->speed_int;
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
|
|
* at the requested speed, etc. If `local' is true, set CLOCAL
|
|
* regardless of whether the modem option was specified.
|
|
*/
|
|
set_up_tty(fd, local)
|
|
int fd, local;
|
|
{
|
|
#ifndef SGTTY
|
|
int speed, x;
|
|
struct termios tios;
|
|
|
|
if (tcgetattr(fd, &tios) < 0) {
|
|
syslog(LOG_ERR, "tcgetattr: %m");
|
|
die(1);
|
|
}
|
|
|
|
if (!restore_term)
|
|
inittermios = tios;
|
|
|
|
#ifdef CRTSCTS
|
|
tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL | CRTSCTS);
|
|
if (crtscts == 1)
|
|
tios.c_cflag |= CRTSCTS;
|
|
#else
|
|
tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
|
|
#endif /* CRTSCTS */
|
|
|
|
tios.c_cflag |= CS8 | CREAD | HUPCL;
|
|
if (local || !modem)
|
|
tios.c_cflag |= CLOCAL;
|
|
tios.c_iflag = IGNBRK | IGNPAR;
|
|
tios.c_oflag = 0;
|
|
tios.c_lflag = 0;
|
|
tios.c_cc[VMIN] = 1;
|
|
tios.c_cc[VTIME] = 0;
|
|
|
|
if (crtscts == 2) {
|
|
tios.c_iflag |= IXOFF;
|
|
tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
|
|
tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
|
|
}
|
|
|
|
speed = translate_speed(inspeed);
|
|
if (speed) {
|
|
cfsetospeed(&tios, speed);
|
|
cfsetispeed(&tios, speed);
|
|
} else {
|
|
speed = cfgetospeed(&tios);
|
|
}
|
|
|
|
if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
|
|
syslog(LOG_ERR, "tcsetattr: %m");
|
|
die(1);
|
|
}
|
|
|
|
#ifdef ultrix
|
|
x = 0;
|
|
if (ioctl(fd, (crtscts || modem)? TIOCMODEM: TIOCNMODEM, &x) < 0)
|
|
syslog(LOG_WARNING, "TIOC(N)MODEM: %m");
|
|
if (ioctl(fd, (local || !modem)? TIOCNCAR: TIOCCAR) < 0)
|
|
syslog(LOG_WARNING, "TIOC(N)CAR: %m");
|
|
#endif
|
|
|
|
#else /* SGTTY */
|
|
int speed;
|
|
struct sgttyb sgttyb;
|
|
|
|
/*
|
|
* Put the tty in raw mode.
|
|
*/
|
|
if (ioctl(fd, TIOCGETP, &sgttyb) < 0) {
|
|
syslog(LOG_ERR, "ioctl(TIOCGETP): %m");
|
|
die(1);
|
|
}
|
|
|
|
if (!restore_term)
|
|
initsgttyb = sgttyb;
|
|
|
|
sgttyb.sg_flags = RAW | ANYP;
|
|
speed = translate_speed(inspeed);
|
|
if (speed)
|
|
sgttyb.sg_ispeed = speed;
|
|
else
|
|
speed = sgttyb.sg_ispeed;
|
|
|
|
if (ioctl(fd, TIOCSETP, &sgttyb) < 0) {
|
|
syslog(LOG_ERR, "ioctl(TIOCSETP): %m");
|
|
die(1);
|
|
}
|
|
#endif
|
|
|
|
baud_rate = baud_rate_of(speed);
|
|
restore_term = TRUE;
|
|
}
|
|
|
|
/*
|
|
* setdtr - control the DTR line on the serial port.
|
|
* This is called from die(), so it shouldn't call die().
|
|
*/
|
|
setdtr(fd, on)
|
|
int fd, on;
|
|
{
|
|
int modembits = TIOCM_DTR;
|
|
|
|
ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
|
|
}
|
|
|
|
|
|
/*
|
|
* quit - Clean up state and exit.
|
|
*/
|
|
void
|
|
quit()
|
|
{
|
|
die(0);
|
|
}
|
|
|
|
/*
|
|
* die - like quit, except we can specify an exit status.
|
|
*/
|
|
void
|
|
die(status)
|
|
int status;
|
|
{
|
|
cleanup(0, NULL);
|
|
syslog(LOG_INFO, "Exit.");
|
|
exit(status);
|
|
}
|
|
|
|
/*
|
|
* cleanup - restore anything which needs to be restored before we exit
|
|
*/
|
|
/* ARGSUSED */
|
|
void
|
|
cleanup(status, arg)
|
|
int status;
|
|
caddr_t arg;
|
|
{
|
|
if (fd >= 0) {
|
|
/* drop dtr to hang up */
|
|
if (modem)
|
|
setdtr(fd, FALSE);
|
|
|
|
if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
|
|
syslog(LOG_WARNING, "fcntl(F_SETFL, fdflags): %m");
|
|
initfdflags = -1;
|
|
|
|
disestablish_ppp();
|
|
|
|
if (restore_term) {
|
|
#ifndef SGTTY
|
|
if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
|
|
syslog(LOG_WARNING, "tcsetattr: %m");
|
|
#else
|
|
if (ioctl(fd, TIOCSETP, &initsgttyb) < 0)
|
|
syslog(LOG_WARNING, "ioctl(TIOCSETP): %m");
|
|
#endif
|
|
}
|
|
|
|
close(fd);
|
|
fd = -1;
|
|
}
|
|
|
|
if (pidfilename[0] != 0 && unlink(pidfilename) < 0)
|
|
syslog(LOG_WARNING, "unable to unlink pid file: %m");
|
|
pidfilename[0] = 0;
|
|
|
|
if (lockflag && !default_device)
|
|
unlock();
|
|
}
|
|
|
|
|
|
static struct callout *callout = NULL; /* Callout list */
|
|
static struct timeval schedtime; /* Time last timeout was set */
|
|
|
|
/*
|
|
* 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)();
|
|
caddr_t arg;
|
|
int time;
|
|
{
|
|
struct itimerval itv;
|
|
struct callout *newp, **oldpp;
|
|
|
|
MAINDEBUG((LOG_DEBUG, "Timeout %x:%x in %d seconds.",
|
|
(int) func, (int) 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;
|
|
|
|
/*
|
|
* Find correct place to link it in and decrement its time by the
|
|
* amount of time used by preceding timeouts.
|
|
*/
|
|
for (oldpp = &callout;
|
|
*oldpp && (*oldpp)->c_time <= time;
|
|
oldpp = &(*oldpp)->c_next)
|
|
time -= (*oldpp)->c_time;
|
|
newp->c_time = time;
|
|
newp->c_next = *oldpp;
|
|
if (*oldpp)
|
|
(*oldpp)->c_time -= time;
|
|
*oldpp = newp;
|
|
|
|
/*
|
|
* If this is now the first callout then we have to set a new
|
|
* itimer.
|
|
*/
|
|
if (callout == newp) {
|
|
itv.it_interval.tv_sec = itv.it_interval.tv_usec =
|
|
itv.it_value.tv_usec = 0;
|
|
itv.it_value.tv_sec = callout->c_time;
|
|
MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds in timeout.",
|
|
itv.it_value.tv_sec));
|
|
if (setitimer(ITIMER_REAL, &itv, NULL)) {
|
|
syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m");
|
|
die(1);
|
|
}
|
|
if (gettimeofday(&schedtime, NULL)) {
|
|
syslog(LOG_ERR, "gettimeofday: %m");
|
|
die(1);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* untimeout - Unschedule a timeout.
|
|
*/
|
|
void
|
|
untimeout(func, arg)
|
|
void (*func)();
|
|
caddr_t arg;
|
|
{
|
|
struct itimerval itv;
|
|
struct callout **copp, *freep;
|
|
int reschedule = 0;
|
|
|
|
MAINDEBUG((LOG_DEBUG, "Untimeout %x:%x.", (int) func, (int) arg));
|
|
|
|
/*
|
|
* If the first callout is unscheduled then we have to set a new
|
|
* itimer.
|
|
*/
|
|
if (callout &&
|
|
callout->c_func == func &&
|
|
callout->c_arg == arg)
|
|
reschedule = 1;
|
|
|
|
/*
|
|
* Find first matching timeout. Add its time to the next timeouts
|
|
* time.
|
|
*/
|
|
for (copp = &callout; *copp; copp = &(*copp)->c_next)
|
|
if ((*copp)->c_func == func &&
|
|
(*copp)->c_arg == arg) {
|
|
freep = *copp;
|
|
*copp = freep->c_next;
|
|
if (*copp)
|
|
(*copp)->c_time += freep->c_time;
|
|
(void) free((char *) freep);
|
|
break;
|
|
}
|
|
|
|
if (reschedule) {
|
|
itv.it_interval.tv_sec = itv.it_interval.tv_usec =
|
|
itv.it_value.tv_usec = 0;
|
|
itv.it_value.tv_sec = callout ? callout->c_time : 0;
|
|
MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds in untimeout.",
|
|
itv.it_value.tv_sec));
|
|
if (setitimer(ITIMER_REAL, &itv, NULL)) {
|
|
syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m");
|
|
die(1);
|
|
}
|
|
if (gettimeofday(&schedtime, NULL)) {
|
|
syslog(LOG_ERR, "gettimeofday: %m");
|
|
die(1);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* adjtimeout - Decrement the first timeout by the amount of time since
|
|
* it was scheduled.
|
|
*/
|
|
void
|
|
adjtimeout()
|
|
{
|
|
struct timeval tv;
|
|
int timediff;
|
|
|
|
if (callout == NULL)
|
|
return;
|
|
/*
|
|
* Make sure that the clock hasn't been warped dramatically.
|
|
* Account for recently expired, but blocked timer by adding
|
|
* small fudge factor.
|
|
*/
|
|
if (gettimeofday(&tv, NULL)) {
|
|
syslog(LOG_ERR, "gettimeofday: %m");
|
|
die(1);
|
|
}
|
|
timediff = tv.tv_sec - schedtime.tv_sec;
|
|
if (timediff < 0 ||
|
|
timediff > callout->c_time + 1)
|
|
return;
|
|
|
|
callout->c_time -= timediff; /* OK, Adjust time */
|
|
}
|
|
|
|
|
|
/*
|
|
* hup - Catch SIGHUP signal.
|
|
*
|
|
* Indicates that the physical layer has been disconnected.
|
|
*/
|
|
static void
|
|
hup(sig)
|
|
int sig;
|
|
{
|
|
syslog(LOG_INFO, "Hangup (SIGHUP)");
|
|
|
|
hungup = 1; /* they hung up on us! */
|
|
persist = 0; /* don't try to restart */
|
|
adjtimeout(); /* Adjust timeouts */
|
|
lcp_lowerdown(0); /* Reset connection */
|
|
quit(); /* and die */
|
|
}
|
|
|
|
|
|
/*
|
|
* term - Catch SIGTERM signal.
|
|
*
|
|
* Indicates that we should initiate a graceful disconnect and exit.
|
|
*/
|
|
static void
|
|
term(sig)
|
|
int sig;
|
|
{
|
|
syslog(LOG_INFO, "Terminating link.");
|
|
persist = 0; /* don't try to restart */
|
|
adjtimeout(); /* Adjust timeouts */
|
|
lcp_close(0); /* Close connection */
|
|
}
|
|
|
|
|
|
/*
|
|
* intr - Catch SIGINT signal (DEL/^C).
|
|
*
|
|
* Indicates that we should initiate a graceful disconnect and exit.
|
|
*/
|
|
static void
|
|
intr(sig)
|
|
int sig;
|
|
{
|
|
syslog(LOG_INFO, "Interrupt received: terminating link");
|
|
persist = 0; /* don't try to restart */
|
|
adjtimeout(); /* Adjust timeouts */
|
|
lcp_close(0); /* Close connection */
|
|
}
|
|
|
|
|
|
/*
|
|
* alrm - Catch SIGALRM signal.
|
|
*
|
|
* Indicates a timeout.
|
|
*/
|
|
static void
|
|
alrm(sig)
|
|
int sig;
|
|
{
|
|
struct itimerval itv;
|
|
struct callout *freep, *list, *last;
|
|
|
|
MAINDEBUG((LOG_DEBUG, "Alarm"));
|
|
|
|
if (callout == NULL)
|
|
return;
|
|
/*
|
|
* Get the first scheduled timeout and any that were scheduled
|
|
* for the same time as a list, and remove them all from callout
|
|
* list.
|
|
*/
|
|
list = last = callout;
|
|
while (last->c_next != NULL && last->c_next->c_time == 0)
|
|
last = last->c_next;
|
|
callout = last->c_next;
|
|
last->c_next = NULL;
|
|
|
|
/*
|
|
* Set a new itimer if there are more timeouts scheduled.
|
|
*/
|
|
if (callout) {
|
|
itv.it_interval.tv_sec = itv.it_interval.tv_usec = 0;
|
|
itv.it_value.tv_usec = 0;
|
|
itv.it_value.tv_sec = callout->c_time;
|
|
MAINDEBUG((LOG_DEBUG, "Setting itimer for %d seconds in alrm.",
|
|
itv.it_value.tv_sec));
|
|
if (setitimer(ITIMER_REAL, &itv, NULL)) {
|
|
syslog(LOG_ERR, "setitimer(ITIMER_REAL): %m");
|
|
die(1);
|
|
}
|
|
if (gettimeofday(&schedtime, NULL)) {
|
|
syslog(LOG_ERR, "gettimeofday: %m");
|
|
die(1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Now call all the timeout routines scheduled for this time.
|
|
*/
|
|
while (list) {
|
|
(*list->c_func)(list->c_arg);
|
|
freep = list;
|
|
list = list->c_next;
|
|
(void) free((char *) freep);
|
|
}
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
* chld - Catch SIGCHLD signal.
|
|
* Calls reap_kids to get status for any dead kids.
|
|
*/
|
|
static void
|
|
chld(sig)
|
|
int sig;
|
|
{
|
|
reap_kids();
|
|
}
|
|
|
|
|
|
/*
|
|
* io - Catch SIGIO signal.
|
|
*
|
|
* Indicates that incoming data is available.
|
|
*/
|
|
static void
|
|
io(sig)
|
|
int sig;
|
|
{
|
|
int len, i;
|
|
u_char *p;
|
|
u_short protocol;
|
|
fd_set fdset;
|
|
struct timeval notime;
|
|
int ready;
|
|
|
|
MAINDEBUG((LOG_DEBUG, "IO signal received"));
|
|
adjtimeout(); /* Adjust timeouts */
|
|
|
|
/* Yup, this is for real */
|
|
for (;;) { /* Read all available packets */
|
|
p = inpacket_buf; /* point to beginning of packet buffer */
|
|
|
|
len = read_packet(inpacket_buf);
|
|
if (len < 0)
|
|
return;
|
|
|
|
if (len == 0) {
|
|
MAINDEBUG((LOG_DEBUG, "End of file on fd!"));
|
|
lcp_lowerdown(0);
|
|
return;
|
|
}
|
|
|
|
if (debug /*&& (debugflags & DBG_INPACKET)*/)
|
|
log_packet(p, len, "rcvd ");
|
|
|
|
if (len < DLLHEADERLEN) {
|
|
MAINDEBUG((LOG_INFO, "io(): Received short packet."));
|
|
return;
|
|
}
|
|
|
|
p += 2; /* Skip address and control */
|
|
GETSHORT(protocol, p);
|
|
len -= DLLHEADERLEN;
|
|
|
|
/*
|
|
* Toss all non-LCP packets unless LCP is OPEN.
|
|
*/
|
|
if (protocol != LCP && lcp_fsm[0].state != OPENED) {
|
|
MAINDEBUG((LOG_INFO,
|
|
"io(): Received non-LCP packet when LCP not open."));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Upcall the proper protocol input routine.
|
|
*/
|
|
for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++)
|
|
if (prottbl[i].protocol == protocol) {
|
|
(*prottbl[i].input)(0, p, len);
|
|
break;
|
|
}
|
|
|
|
if (i == sizeof (prottbl) / sizeof (struct protent)) {
|
|
syslog(LOG_WARNING, "input: Unknown protocol (%x) received!",
|
|
protocol);
|
|
lcp_sprotrej(0, p - DLLHEADERLEN, len + DLLHEADERLEN);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* demuxprotrej - Demultiplex a Protocol-Reject.
|
|
*/
|
|
void
|
|
demuxprotrej(unit, protocol)
|
|
int unit;
|
|
u_short protocol;
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* Upcall the proper Protocol-Reject routine.
|
|
*/
|
|
for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++)
|
|
if (prottbl[i].protocol == protocol) {
|
|
(*prottbl[i].protrej)(unit);
|
|
return;
|
|
}
|
|
|
|
syslog(LOG_WARNING,
|
|
"demuxprotrej: Unrecognized Protocol-Reject for protocol %d!",
|
|
protocol);
|
|
}
|
|
|
|
|
|
/*
|
|
* incdebug - Catch SIGUSR1 signal.
|
|
*
|
|
* Increment debug flag.
|
|
*/
|
|
/*ARGSUSED*/
|
|
static void
|
|
incdebug(sig)
|
|
int sig;
|
|
{
|
|
syslog(LOG_INFO, "Debug turned ON, Level %d", debug);
|
|
setlogmask(LOG_UPTO(LOG_DEBUG));
|
|
debug++;
|
|
}
|
|
|
|
|
|
/*
|
|
* nodebug - Catch SIGUSR2 signal.
|
|
*
|
|
* Turn off debugging.
|
|
*/
|
|
/*ARGSUSED*/
|
|
static void
|
|
nodebug(sig)
|
|
int sig;
|
|
{
|
|
setlogmask(LOG_UPTO(LOG_WARNING));
|
|
debug = 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* device_script - run a program to connect or disconnect the
|
|
* serial device.
|
|
*/
|
|
int
|
|
device_script(program, in, out)
|
|
char *program;
|
|
int in, out;
|
|
{
|
|
int pid;
|
|
int status;
|
|
sigset_t mask;
|
|
|
|
sigemptyset(&mask);
|
|
sigaddset(&mask, SIGINT);
|
|
sigaddset(&mask, SIGHUP);
|
|
sigprocmask(SIG_BLOCK, &mask, &mask);
|
|
|
|
pid = fork();
|
|
|
|
if (pid < 0) {
|
|
syslog(LOG_ERR, "fork: %m");
|
|
die(1);
|
|
}
|
|
|
|
if (pid == 0) {
|
|
initgroups(username, gid);
|
|
setgid(gid);
|
|
setuid(uid);
|
|
sigprocmask(SIG_SETMASK, &mask, NULL);
|
|
dup2(in, 0);
|
|
dup2(out, 1);
|
|
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, "waiting for (dis)connection process: %m");
|
|
die(1);
|
|
}
|
|
sigprocmask(SIG_SETMASK, &mask, NULL);
|
|
|
|
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;
|
|
|
|
pid = fork();
|
|
if (pid == -1) {
|
|
syslog(LOG_ERR, "can't fork to run %s: %m", prog);
|
|
return -1;
|
|
}
|
|
if (pid == 0) {
|
|
execv(prog, args);
|
|
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.
|
|
*/
|
|
void
|
|
reap_kids()
|
|
{
|
|
int pid, status;
|
|
|
|
if (n_children == 0)
|
|
return;
|
|
if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
|
|
if (errno != ECHILD)
|
|
syslog(LOG_ERR, "waitpid: %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)
|
|
u_char *p;
|
|
int len;
|
|
char *prefix;
|
|
{
|
|
strcpy(line, prefix);
|
|
linep = line + strlen(line);
|
|
format_packet(p, len, pr_log, NULL);
|
|
if (linep != line)
|
|
syslog(LOG_DEBUG, "%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) __ARGS((void *, char *, ...));
|
|
void *arg;
|
|
{
|
|
int i, n;
|
|
u_short proto;
|
|
u_char x;
|
|
|
|
if (len >= DLLHEADERLEN && p[0] == ALLSTATIONS && p[1] == UI) {
|
|
p += 2;
|
|
GETSHORT(proto, p);
|
|
len -= DLLHEADERLEN;
|
|
for (i = 0; i < N_PROTO; ++i)
|
|
if (proto == prottbl[i].protocol)
|
|
break;
|
|
if (i < N_PROTO) {
|
|
printer(arg, "[%s", prottbl[i].name);
|
|
n = (*prottbl[i].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);
|
|
}
|
|
}
|
|
|
|
#ifdef __STDC__
|
|
#include <stdarg.h>
|
|
|
|
void
|
|
pr_log(void *arg, char *fmt, ...)
|
|
{
|
|
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;
|
|
}
|
|
strcpy(linep, buf);
|
|
linep += n;
|
|
}
|
|
|
|
#else /* __STDC__ */
|
|
#include <varargs.h>
|
|
|
|
void
|
|
pr_log(arg, fmt, va_alist)
|
|
void *arg;
|
|
char *fmt;
|
|
va_dcl
|
|
{
|
|
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;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* print_string - print a readable representation of a string using
|
|
* printer.
|
|
*/
|
|
void
|
|
print_string(p, len, printer, arg)
|
|
char *p;
|
|
int len;
|
|
void (*printer) __ARGS((void *, char *, ...));
|
|
void *arg;
|
|
{
|
|
int c;
|
|
|
|
printer(arg, "\"");
|
|
for (; len > 0; --len) {
|
|
c = *p++;
|
|
if (' ' <= c && c <= '~')
|
|
printer(arg, "%c", c);
|
|
else
|
|
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);
|
|
}
|