1098 lines
24 KiB
C
1098 lines
24 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 1.27 1995/08/16 01:39:08 paulus Exp $";
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.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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/*
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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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/* 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 default_devnam[MAXPATHLEN]; /* name of default device */
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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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static uid_t uid; /* Our real user-id */
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int fd = -1; /* Device file descriptor */
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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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static int initfdflags = -1; /* Initial file descriptor flags */
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u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
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static u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* 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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int baud_rate;
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char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
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/* prototypes */
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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 get_input __P((void));
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void establish_ppp __P((void));
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void calltimeout __P((void));
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struct timeval *timeleft __P((struct timeval *));
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void reap_kids __P((void));
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void cleanup __P((int, caddr_t));
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void close_fd __P((void));
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void die __P((int));
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void novm __P((char *));
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void log_packet __P((u_char *, int, char *));
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void format_packet __P((u_char *, int,
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void (*) (void *, char *, ...), void *));
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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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#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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/*
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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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void (*datainput)();
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char *name;
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} prottbl[] = {
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{ PPP_LCP, lcp_init, lcp_input, lcp_protrej,
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lcp_printpkt, NULL, "LCP" },
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{ PPP_IPCP, ipcp_init, ipcp_input, ipcp_protrej,
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ipcp_printpkt, NULL, "IPCP" },
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{ PPP_PAP, upap_init, upap_input, upap_protrej,
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upap_printpkt, NULL, "PAP" },
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{ PPP_CHAP, ChapInit, ChapInput, ChapProtocolReject,
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ChapPrintPkt, NULL, "CHAP" },
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{ PPP_CCP, ccp_init, ccp_input, ccp_protrej,
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ccp_printpkt, ccp_datainput, "CCP" },
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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 i, nonblock;
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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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struct timeval timo;
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sigset_t mask;
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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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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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uid = getuid();
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if (!ppp_available()) {
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fprintf(stderr, no_ppp_msg);
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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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* 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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/*
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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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/*
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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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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 started by %s, uid %d",
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VERSION, PATCHLEVEL, 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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* 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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die(1);
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do {
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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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* If we're dialling out, or we don't want to use the modem lines,
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* we open it in non-blocking mode, but then we need to clear
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* the non-blocking I/O bit.
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*/
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nonblock = (connector || !modem)? O_NONBLOCK: 0;
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if ((fd = open(devnam, nonblock | O_RDWR, 0)) < 0) {
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syslog(LOG_ERR, "Failed to open %s: %m", devnam);
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die(1);
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}
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if ((initfdflags = fcntl(fd, F_GETFL)) == -1) {
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syslog(LOG_ERR, "Couldn't get device fd flags: %m");
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die(1);
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}
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if (nonblock) {
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initfdflags &= ~O_NONBLOCK;
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fcntl(fd, F_SETFL, initfdflags);
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}
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hungup = 0;
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kill_link = 0;
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if (!default_device)
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setsid();
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/* 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(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, "Connect script failed");
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setdtr(fd, FALSE);
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die(1);
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}
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syslog(LOG_INFO, "Serial connection established.");
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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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/* attach to the controlling tty for signals */
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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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/* 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", _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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* Set device for non-blocking reads.
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*/
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if (fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
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syslog(LOG_ERR, "Couldn't set device to non-blocking mode: %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 events (reply, timeout, etc.).
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*/
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syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
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lcp_lowerup(0);
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lcp_open(0); /* Start protocol */
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for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
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wait_input(timeleft(&timo));
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calltimeout();
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get_input();
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if (kill_link) {
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lcp_close(0);
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kill_link = 0;
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}
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if (open_ccp_flag) {
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if (phase == PHASE_NETWORK) {
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ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
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ccp_open(0);
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}
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open_ccp_flag = 0;
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}
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reap_kids(); /* Don't leave dead kids lying around */
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}
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/*
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* Run disconnector script, if requested.
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* First we need to reset non-blocking mode.
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* XXX we may not be able to do this if the line has hung up!
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*/
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if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) >= 0)
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initfdflags = -1;
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disestablish_ppp();
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if (disconnector) {
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set_up_tty(fd, 1);
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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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} else {
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syslog(LOG_INFO, "Serial link disconnected.");
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}
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}
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close_fd();
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if (unlink(pidfilename) < 0 && errno != ENOENT)
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syslog(LOG_WARNING, "unable to delete pid file: %m");
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pidfilename[0] = 0;
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} while (persist);
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die(0);
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}
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/*
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* get_input - called when incoming data is available.
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*/
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static void
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get_input()
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{
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int len, i;
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u_char *p;
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u_short protocol;
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p = inpacket_buf; /* point to beginning of packet buffer */
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len = read_packet(inpacket_buf);
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if (len < 0)
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return;
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if (len == 0) {
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syslog(LOG_NOTICE, "Modem hangup");
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hungup = 1;
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lcp_lowerdown(0); /* serial link is no longer available */
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phase = PHASE_DEAD;
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return;
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}
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if (debug /*&& (debugflags & DBG_INPACKET)*/)
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log_packet(p, len, "rcvd ");
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if (len < PPP_HDRLEN) {
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MAINDEBUG((LOG_INFO, "io(): Received short packet."));
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return;
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}
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p += 2; /* Skip address and control */
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GETSHORT(protocol, p);
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len -= PPP_HDRLEN;
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/*
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* Toss all non-LCP packets unless LCP is OPEN.
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*/
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if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
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MAINDEBUG((LOG_INFO,
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"io(): Received non-LCP packet when LCP not open."));
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return;
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}
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/*
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* Upcall the proper protocol input routine.
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*/
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for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++) {
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if (prottbl[i].protocol == protocol) {
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(*prottbl[i].input)(0, p, len);
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return;
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}
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if (protocol == (prottbl[i].protocol & ~0x8000)
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&& prottbl[i].datainput != NULL) {
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(*prottbl[i].datainput)(0, p, len);
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return;
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}
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}
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if (debug)
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syslog(LOG_WARNING, "Unknown protocol (0x%x) received", protocol);
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lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
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}
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/*
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* demuxprotrej - Demultiplex a Protocol-Reject.
|
|
*/
|
|
void
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demuxprotrej(unit, protocol)
|
|
int unit;
|
|
u_short protocol;
|
|
{
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int i;
|
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|
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/*
|
|
* Upcall the proper Protocol-Reject routine.
|
|
*/
|
|
for (i = 0; i < sizeof (prottbl) / sizeof (struct protent); i++)
|
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if (prottbl[i].protocol == protocol) {
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(*prottbl[i].protrej)(unit);
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return;
|
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}
|
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|
|
syslog(LOG_WARNING,
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"demuxprotrej: Unrecognized Protocol-Reject for protocol 0x%x",
|
|
protocol);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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);
|
|
die(1);
|
|
}
|
|
|
|
/*
|
|
* 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(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)
|
|
close_fd();
|
|
|
|
if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
|
|
syslog(LOG_WARNING, "unable to delete pid file: %m");
|
|
pidfilename[0] = 0;
|
|
|
|
if (lockflag && !default_device)
|
|
unlock();
|
|
}
|
|
|
|
/*
|
|
* close_fd - restore the terminal device and close it.
|
|
*/
|
|
void
|
|
close_fd()
|
|
{
|
|
disestablish_ppp();
|
|
|
|
/* drop dtr to hang up */
|
|
if (modem)
|
|
setdtr(fd, FALSE);
|
|
|
|
if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
|
|
syslog(LOG_WARNING, "Couldn't restore device fd flags: %m");
|
|
initfdflags = -1;
|
|
|
|
restore_tty();
|
|
|
|
close(fd);
|
|
fd = -1;
|
|
}
|
|
|
|
|
|
struct callout {
|
|
struct timeval c_time; /* time at which to call routine */
|
|
caddr_t c_arg; /* argument to routine */
|
|
void (*c_func)(); /* 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)();
|
|
caddr_t 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)();
|
|
caddr_t arg;
|
|
{
|
|
struct itimerval itv;
|
|
struct callout **copp, *freep;
|
|
int reschedule = 0;
|
|
|
|
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.
|
|
*/
|
|
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.
|
|
*/
|
|
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;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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;
|
|
note_debug_level();
|
|
}
|
|
|
|
|
|
/*
|
|
* open_ccp - Catch SIGUSR2 signal.
|
|
*
|
|
* Try to (re)negotiate compression.
|
|
*/
|
|
/*ARGSUSED*/
|
|
static void
|
|
open_ccp(sig)
|
|
int sig;
|
|
{
|
|
open_ccp_flag = 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* 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;
|
|
int errfd;
|
|
|
|
pid = fork();
|
|
|
|
if (pid < 0) {
|
|
syslog(LOG_ERR, "Failed to create child process: %m");
|
|
die(1);
|
|
}
|
|
|
|
if (pid == 0) {
|
|
dup2(in, 0);
|
|
dup2(out, 1);
|
|
errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0644);
|
|
if (errfd >= 0)
|
|
dup2(errfd, 2);
|
|
setuid(getuid());
|
|
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);
|
|
}
|
|
|
|
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. */
|
|
close (0);
|
|
close (1);
|
|
close (2);
|
|
close (fd); /* tty interface to the ppp device */
|
|
/* XXX should call sysdep cleanup procedure here */
|
|
|
|
/* 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.
|
|
*/
|
|
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)
|
|
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) __P((void *, char *, ...));
|
|
void *arg;
|
|
{
|
|
int i, n;
|
|
u_short proto;
|
|
u_char x;
|
|
|
|
if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
|
|
p += 2;
|
|
GETSHORT(proto, p);
|
|
len -= PPP_HDRLEN;
|
|
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) __P((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);
|
|
}
|