2 * main.c - Point-to-Point Protocol main module
4 * Copyright (c) 1989 Carnegie Mellon University.
7 * Redistribution and use in source and binary forms are permitted
8 * provided that the above copyright notice and this paragraph are
9 * duplicated in all such forms and that any documentation,
10 * advertising materials, and other materials related to such
11 * distribution and use acknowledge that the software was developed
12 * by Carnegie Mellon University. The name of the
13 * University may not be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 #define RCSID "$Id: main.c,v 1.1.1.4 2003/10/14 08:09:53 sparq Exp $"
35 #include <sys/param.h>
36 #include <sys/types.h>
39 #include <sys/resource.h>
41 #include <sys/socket.h>
42 #include <netinet/in.h>
43 #include <arpa/inet.h>
56 #include "pathnames.h"
65 #endif /* IPX_CHANGE */
70 static const char rcsid
[] = RCSID
;
73 char ifname
[32]; /* Interface name */
74 int ifunit
; /* Interface unit number */
76 struct channel
*the_channel
;
78 char *progname
; /* Name of this program */
79 char hostname
[MAXNAMELEN
]; /* Our hostname */
80 static char pidfilename
[MAXPATHLEN
]; /* name of pid file */
81 static char linkpidfile
[MAXPATHLEN
]; /* name of linkname pid file */
82 char ppp_devnam
[MAXPATHLEN
]; /* name of PPP tty (maybe ttypx) */
83 uid_t uid
; /* Our real user-id */
84 struct notifier
*pidchange
= NULL
;
85 struct notifier
*phasechange
= NULL
;
86 struct notifier
*exitnotify
= NULL
;
87 struct notifier
*sigreceived
= NULL
;
89 int hungup
; /* terminal has been hung up */
90 int privileged
; /* we're running as real uid root */
91 int need_holdoff
; /* need holdoff period before restarting */
92 int detached
; /* have detached from terminal */
93 volatile int status
; /* exit status for pppd */
94 int unsuccess
; /* # unsuccessful connection attempts */
95 int do_callback
; /* != 0 if we should do callback next */
96 int doing_callback
; /* != 0 if we are doing callback */
97 TDB_CONTEXT
*pppdb
; /* database for storing status etc. */
100 int (*holdoff_hook
) __P((void)) = NULL
;
101 int (*new_phase_hook
) __P((int)) = NULL
;
103 static int conn_running
; /* we have a [dis]connector running */
104 static int devfd
; /* fd of underlying device */
105 static int fd_ppp
= -1; /* fd for talking PPP */
106 static int fd_loop
; /* fd for getting demand-dial packets */
108 int phase
; /* where the link is at */
117 static sigjmp_buf sigjmp
;
119 char **script_env
; /* Env. variable values for scripts */
120 int s_env_nalloc
; /* # words avail at script_env */
122 u_char outpacket_buf
[PPP_MRU
+PPP_HDRLEN
]; /* buffer for outgoing packet */
123 u_char inpacket_buf
[PPP_MRU
+PPP_HDRLEN
]; /* buffer for incoming packet */
125 static int n_children
; /* # child processes still running */
126 static int got_sigchld
; /* set if we have received a SIGCHLD */
128 int privopen
; /* don't lock, open device as root */
130 char *no_ppp_msg
= "Sorry - this system lacks PPP kernel support\n";
132 GIDSET_TYPE groups
[NGROUPS_MAX
];/* groups the user is in */
133 int ngroups
; /* How many groups valid in groups */
135 static struct timeval start_time
; /* Time when link was started. */
137 struct pppd_stats link_stats
;
138 int link_connect_time
;
139 int link_stats_valid
;
142 * We maintain a list of child process pids and
143 * functions to call when they exit.
148 void (*done
) __P((void *));
150 struct subprocess
*next
;
153 static struct subprocess
*children
;
155 /* Prototypes for procedures local to this file. */
157 static void setup_signals
__P((void));
158 static void create_pidfile
__P((void));
159 static void create_linkpidfile
__P((void));
160 static void cleanup
__P((void));
161 static void get_input
__P((void));
162 static void calltimeout
__P((void));
163 static struct timeval
*timeleft
__P((struct timeval
*));
164 static void kill_my_pg
__P((int));
165 static void hup
__P((int));
166 static void term
__P((int));
167 static void chld
__P((int));
168 static void toggle_debug
__P((int));
169 static void open_ccp
__P((int));
170 static void bad_signal
__P((int));
171 static void holdoff_end
__P((void *));
172 static int reap_kids
__P((int waitfor
));
173 static void update_db_entry
__P((void));
174 static void add_db_key
__P((const char *));
175 static void delete_db_key
__P((const char *));
176 static void cleanup_db
__P((void));
177 static void handle_events
__P((void));
179 extern char *ttyname
__P((int));
180 extern char *getlogin
__P((void));
181 int main
__P((int, char *[]));
185 #define O_NONBLOCK O_NDELAY
189 #define setlogmask(x)
193 * PPP Data Link Layer "protocol" table.
194 * One entry per supported protocol.
195 * The last entry must be NULL.
197 struct protent
*protocols
[] = {
219 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
221 #if !defined(PPP_DRV_NAME)
222 #define PPP_DRV_NAME "ppp"
223 #endif /* !defined(PPP_DRV_NAME) */
233 struct protent
*protp
;
236 new_phase(PHASE_INITIALIZE
);
239 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
240 * This way we can close 0, 1, 2 in detach() without clobbering
241 * a fd that we are using.
243 if ((i
= open("/dev/null", O_RDWR
)) >= 0) {
244 while (0 <= i
&& i
<= 2)
252 /* Initialize syslog facilities */
255 if (gethostname(hostname
, MAXNAMELEN
) < 0 ) {
256 option_error("Couldn't get hostname: %m");
259 hostname
[MAXNAMELEN
-1] = 0;
261 /* make sure we don't create world or group writable files. */
262 umask(umask(0777) | 022);
265 privileged
= uid
== 0;
266 slprintf(numbuf
, sizeof(numbuf
), "%d", uid
);
267 script_setenv("ORIG_UID", numbuf
, 0);
269 ngroups
= getgroups(NGROUPS_MAX
, groups
);
272 * Initialize magic number generator now so that protocols may
273 * use magic numbers in initialization.
278 * Initialize each protocol.
280 for (i
= 0; (protp
= protocols
[i
]) != NULL
; ++i
)
284 * Initialize the default channel.
291 * Parse, in order, the system options file, the user's options file,
292 * and the command line arguments.
295 if (!options_from_file(_PATH_SYSOPTIONS
, !privileged
, 0, 1)
296 || !options_from_user()
297 || !parse_args(argc
-1, argv
+1))
298 exit(EXIT_OPTION_ERROR
);
299 devnam_fixed
= 1; /* can no longer change device name */
302 * Work out the device name, if it hasn't already been specified,
303 * and parse the tty's options file.
305 if (the_channel
->process_extra_options
)
306 (*the_channel
->process_extra_options
)();
309 setlogmask(LOG_UPTO(LOG_DEBUG
));
312 * Check that we are running as root.
314 if (geteuid() != 0) {
315 option_error("must be root to run %s, since it is not setuid-root",
320 if (!ppp_available()) {
321 option_error("%s", no_ppp_msg
);
322 exit(EXIT_NO_KERNEL_SUPPORT
);
326 * Check that the options given are valid and consistent.
329 if (!sys_check_options())
330 exit(EXIT_OPTION_ERROR
);
331 auth_check_options();
332 #ifdef HAVE_MULTILINK
335 for (i
= 0; (protp
= protocols
[i
]) != NULL
; ++i
)
336 if (protp
->check_options
!= NULL
)
337 (*protp
->check_options
)();
338 if (the_channel
->check_options
)
339 (*the_channel
->check_options
)();
342 if (dump_options
|| dryrun
) {
343 init_pr_log(NULL
, LOG_INFO
);
344 print_options(pr_log
, NULL
);
351 * Initialize system-dependent stuff.
355 pppdb
= tdb_open(_PATH_PPPDB
, 0, 0, O_RDWR
|O_CREAT
, 0644);
357 slprintf(db_key
, sizeof(db_key
), "pppd%d", getpid());
360 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB
);
362 warn("Warning: disabling multilink");
368 * Detach ourselves from the terminal, if required,
369 * and identify who is running us.
371 if (!nodetach
&& !updetach
)
376 if (pw
!= NULL
&& pw
->pw_name
!= NULL
)
381 syslog(LOG_NOTICE
, "pppd %s started by %s, uid %d", VERSION
, p
, uid
);
382 script_setenv("PPPLOGNAME", p
, 0);
385 script_setenv("DEVICE", devnam
, 1);
386 slprintf(numbuf
, sizeof(numbuf
), "%d", getpid());
387 script_setenv("PPPD_PID", numbuf
, 1);
393 create_linkpidfile();
396 * If we're doing dial-on-demand, set up the interface now.
400 * Open the loopback channel and set it up to be the ppp interface.
402 tdb_writelock(pppdb
);
403 fd_loop
= open_ppp_loopback();
405 tdb_writeunlock(pppdb
);
408 * Configure the interface and mark it up, etc.
421 doing_callback
= do_callback
;
424 if (demand
&& !doing_callback
) {
426 * Don't do anything until we see some activity.
428 new_phase(PHASE_DORMANT
);
433 if (kill_link
&& !persist
)
435 if (get_loop_output())
439 if (kill_link
&& !persist
)
443 * Now we want to bring up the link.
446 info("Starting link");
449 new_phase(PHASE_SERIALCONN
);
451 devfd
= the_channel
->connect();
455 /* set up the serial device as a ppp interface */
456 tdb_writelock(pppdb
);
457 fd_ppp
= the_channel
->establish_ppp(devfd
);
459 tdb_writeunlock(pppdb
);
460 status
= EXIT_FATAL_ERROR
;
464 if (!demand
&& ifunit
>= 0)
466 tdb_writeunlock(pppdb
);
469 * Start opening the connection and wait for
470 * incoming events (reply, timeout, etc.).
472 notice("Connect: %s <--> %s", ifname
, ppp_devnam
);
473 gettimeofday(&start_time
, NULL
);
474 link_stats_valid
= 0;
475 script_unsetenv("CONNECT_TIME");
476 script_unsetenv("BYTES_SENT");
477 script_unsetenv("BYTES_RCVD");
481 lcp_open(0); /* Start protocol */
482 status
= EXIT_NEGOTIATION_FAILED
;
483 new_phase(PHASE_ESTABLISH
);
484 while (phase
!= PHASE_DEAD
) {
488 lcp_close(0, "User request");
490 if (phase
== PHASE_NETWORK
|| phase
== PHASE_RUNNING
) {
491 ccp_fsm
[0].flags
= OPT_RESTART
; /* clears OPT_SILENT */
492 (*ccp_protent
.open
)(0);
498 * Print connect time and statistics.
500 if (link_stats_valid
) {
501 int t
= (link_connect_time
+ 5) / 6; /* 1/10ths of minutes */
502 info("Connect time %d.%d minutes.", t
/10, t
%10);
503 info("Sent %u bytes, received %u bytes.",
504 link_stats
.bytes_out
, link_stats
.bytes_in
);
508 * Delete pid file before disestablishing ppp. Otherwise it
509 * can happen that another pppd gets the same unit and then
510 * we delete its pid file.
513 if (pidfilename
[0] != 0
514 && unlink(pidfilename
) < 0 && errno
!= ENOENT
)
515 warn("unable to delete pid file %s: %m", pidfilename
);
520 * If we may want to bring the link up again, transfer
521 * the ppp unit back to the loopback. Set the
522 * real serial device back to its normal mode of operation.
526 the_channel
->disestablish_ppp(devfd
);
531 script_unsetenv("IFNAME");
534 new_phase(PHASE_DISCONNECT
);
535 the_channel
->disconnect();
538 if (the_channel
->cleanup
)
539 (*the_channel
->cleanup
)();
542 if (pidfilename
[0] != 0
543 && unlink(pidfilename
) < 0 && errno
!= ENOENT
)
544 warn("unable to delete pid file %s: %m", pidfilename
);
548 if (!persist
|| (maxfail
> 0 && unsuccess
>= maxfail
))
553 t
= need_holdoff
? holdoff
: 0;
555 t
= (*holdoff_hook
)();
557 new_phase(PHASE_HOLDOFF
);
558 TIMEOUT(holdoff_end
, NULL
, t
);
562 new_phase(PHASE_DORMANT
); /* allow signal to end holdoff */
563 } while (phase
== PHASE_HOLDOFF
);
569 /* Wait for scripts to finish */
570 while (n_children
> 0) {
572 struct subprocess
*chp
;
573 dbglog("Waiting for %d child processes...", n_children
);
574 for (chp
= children
; chp
!= NULL
; chp
= chp
->next
)
575 dbglog(" script %s, pid %d", chp
->prog
, chp
->pid
);
577 if (reap_kids(1) < 0)
586 * handle_events - wait for something to happen and respond to it.
594 kill_link
= open_ccp_flag
= 0;
595 if (sigsetjmp(sigjmp
, 1) == 0) {
596 sigprocmask(SIG_BLOCK
, &mask
, NULL
);
597 if (got_sighup
|| got_sigterm
|| got_sigusr2
|| got_sigchld
) {
598 sigprocmask(SIG_UNBLOCK
, &mask
, NULL
);
601 sigprocmask(SIG_UNBLOCK
, &mask
, NULL
);
602 wait_input(timeleft(&timo
));
610 if (status
!= EXIT_HANGUP
)
611 status
= EXIT_USER_REQUEST
;
616 status
= EXIT_USER_REQUEST
;
620 reap_kids(0); /* Don't leave dead kids lying around */
630 * setup_signals - initialize signal handling.
639 * Compute mask of all interesting signals and install signal handlers
640 * for each. Only one signal handler may be active at a time. Therefore,
641 * all other signals should be masked when any handler is executing.
644 sigaddset(&mask
, SIGHUP
);
645 sigaddset(&mask
, SIGINT
);
646 sigaddset(&mask
, SIGTERM
);
647 sigaddset(&mask
, SIGCHLD
);
648 sigaddset(&mask
, SIGUSR2
);
650 #define SIGNAL(s, handler) do { \
651 sa.sa_handler = handler; \
652 if (sigaction(s, &sa, NULL) < 0) \
653 fatal("Couldn't establish signal handler (%d): %m", s); \
658 SIGNAL(SIGHUP
, hup
); /* Hangup */
659 SIGNAL(SIGINT
, term
); /* Interrupt */
660 SIGNAL(SIGTERM
, term
); /* Terminate */
661 SIGNAL(SIGCHLD
, chld
);
663 SIGNAL(SIGUSR1
, toggle_debug
); /* Toggle debug flag */
664 SIGNAL(SIGUSR2
, open_ccp
); /* Reopen CCP */
667 * Install a handler for other signals which would otherwise
668 * cause pppd to exit without cleaning up.
670 SIGNAL(SIGABRT
, bad_signal
);
671 SIGNAL(SIGALRM
, bad_signal
);
672 SIGNAL(SIGFPE
, bad_signal
);
673 SIGNAL(SIGILL
, bad_signal
);
674 SIGNAL(SIGPIPE
, bad_signal
);
675 SIGNAL(SIGQUIT
, bad_signal
);
676 SIGNAL(SIGSEGV
, bad_signal
);
678 SIGNAL(SIGBUS
, bad_signal
);
681 SIGNAL(SIGEMT
, bad_signal
);
684 SIGNAL(SIGPOLL
, bad_signal
);
687 SIGNAL(SIGPROF
, bad_signal
);
690 SIGNAL(SIGSYS
, bad_signal
);
693 SIGNAL(SIGTRAP
, bad_signal
);
696 SIGNAL(SIGVTALRM
, bad_signal
);
699 SIGNAL(SIGXCPU
, bad_signal
);
702 SIGNAL(SIGXFSZ
, bad_signal
);
706 * Apparently we can get a SIGPIPE when we call syslog, if
707 * syslogd has died and been restarted. Ignoring it seems
710 signal(SIGPIPE
, SIG_IGN
);
714 * set_ifunit - do things we need to do once we know which ppp
721 info("Using interface %s%d", PPP_DRV_NAME
, ifunit
);
722 slprintf(ifname
, sizeof(ifname
), "%s%d", PPP_DRV_NAME
, ifunit
);
723 script_setenv("IFNAME", ifname
, iskey
);
725 create_pidfile(); /* write pid to file */
726 create_linkpidfile();
731 * detach - detach us from the controlling terminal.
741 if ((pid
= fork()) < 0) {
742 error("Couldn't detach (fork failed: %m)");
743 die(1); /* or just return? */
747 notify(pidchange
, pid
);
748 exit(0); /* parent dies */
758 /* update pid files if they have been written already */
762 create_linkpidfile();
763 slprintf(numbuf
, sizeof(numbuf
), "%d", getpid());
764 script_setenv("PPPD_PID", numbuf
, 1);
768 * reopen_log - (re)open our connection to syslog.
774 openlog("pppd", LOG_PID
);
776 openlog("pppd", LOG_PID
| LOG_NDELAY
, LOG_PPP
);
777 setlogmask(LOG_UPTO(LOG_INFO
));
782 * Create a file containing our process ID.
789 slprintf(pidfilename
, sizeof(pidfilename
), "%s%s.pid",
790 _PATH_VARRUN
, ifname
);
791 if ((pidfile
= fopen(pidfilename
, "w")) != NULL
) {
792 fprintf(pidfile
, "%d\n", getpid());
793 (void) fclose(pidfile
);
795 error("Failed to create pid file %s: %m", pidfilename
);
805 if (linkname
[0] == 0)
807 script_setenv("LINKNAME", linkname
, 1);
808 slprintf(linkpidfile
, sizeof(linkpidfile
), "%sppp-%s.pid",
809 _PATH_VARRUN
, linkname
);
810 if ((pidfile
= fopen(linkpidfile
, "w")) != NULL
) {
811 fprintf(pidfile
, "%d\n", getpid());
813 fprintf(pidfile
, "%s\n", ifname
);
814 (void) fclose(pidfile
);
816 error("Failed to create pid file %s: %m", linkpidfile
);
822 * holdoff_end - called via a timeout when the holdoff period ends.
828 new_phase(PHASE_DORMANT
);
831 /* List of protocol names, to make our messages a little more informative. */
832 struct protocol_list
{
835 } protocol_list
[] = {
837 { 0x23, "OSI Network Layer" },
838 { 0x25, "Xerox NS IDP" },
839 { 0x27, "DECnet Phase IV" },
840 { 0x29, "Appletalk" },
841 { 0x2b, "Novell IPX" },
842 { 0x2d, "VJ compressed TCP/IP" },
843 { 0x2f, "VJ uncompressed TCP/IP" },
844 { 0x31, "Bridging PDU" },
845 { 0x33, "Stream Protocol ST-II" },
846 { 0x35, "Banyan Vines" },
847 { 0x39, "AppleTalk EDDP" },
848 { 0x3b, "AppleTalk SmartBuffered" },
849 { 0x3d, "Multi-Link" },
850 { 0x3f, "NETBIOS Framing" },
851 { 0x41, "Cisco Systems" },
852 { 0x43, "Ascom Timeplex" },
853 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
854 { 0x47, "DCA Remote Lan" },
855 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
856 { 0x4b, "SNA over 802.2" },
858 { 0x4f, "IP6 Header Compression" },
859 { 0x6f, "Stampede Bridging" },
860 { 0xfb, "single-link compression" },
861 { 0xfd, "1st choice compression" },
862 { 0x0201, "802.1d Hello Packets" },
863 { 0x0203, "IBM Source Routing BPDU" },
864 { 0x0205, "DEC LANBridge100 Spanning Tree" },
865 { 0x0231, "Luxcom" },
866 { 0x0233, "Sigma Network Systems" },
867 { 0x8021, "Internet Protocol Control Protocol" },
868 { 0x8023, "OSI Network Layer Control Protocol" },
869 { 0x8025, "Xerox NS IDP Control Protocol" },
870 { 0x8027, "DECnet Phase IV Control Protocol" },
871 { 0x8029, "Appletalk Control Protocol" },
872 { 0x802b, "Novell IPX Control Protocol" },
873 { 0x8031, "Bridging NCP" },
874 { 0x8033, "Stream Protocol Control Protocol" },
875 { 0x8035, "Banyan Vines Control Protocol" },
876 { 0x803d, "Multi-Link Control Protocol" },
877 { 0x803f, "NETBIOS Framing Control Protocol" },
878 { 0x8041, "Cisco Systems Control Protocol" },
879 { 0x8043, "Ascom Timeplex" },
880 { 0x8045, "Fujitsu LBLB Control Protocol" },
881 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
882 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
883 { 0x804b, "SNA over 802.2 Control Protocol" },
884 { 0x804d, "SNA Control Protocol" },
885 { 0x804f, "IP6 Header Compression Control Protocol" },
886 { 0x006f, "Stampede Bridging Control Protocol" },
887 { 0x80fb, "Single Link Compression Control Protocol" },
888 { 0x80fd, "Compression Control Protocol" },
889 { 0xc021, "Link Control Protocol" },
890 { 0xc023, "Password Authentication Protocol" },
891 { 0xc025, "Link Quality Report" },
892 { 0xc027, "Shiva Password Authentication Protocol" },
893 { 0xc029, "CallBack Control Protocol (CBCP)" },
894 { 0xc081, "Container Control Protocol" },
895 { 0xc223, "Challenge Handshake Authentication Protocol" },
896 { 0xc281, "Proprietary Authentication Protocol" },
901 * protocol_name - find a name for a PPP protocol.
907 struct protocol_list
*lp
;
909 for (lp
= protocol_list
; lp
->proto
!= 0; ++lp
)
910 if (proto
== lp
->proto
)
916 * get_input - called when incoming data is available.
924 struct protent
*protp
;
926 p
= inpacket_buf
; /* point to beginning of packet buffer */
928 len
= read_packet(inpacket_buf
);
933 notice("Modem hangup");
935 status
= EXIT_HANGUP
;
936 lcp_lowerdown(0); /* serial link is no longer available */
941 if (debug
/*&& (debugflags & DBG_INPACKET)*/)
942 dbglog("rcvd %P", p
, len
);
944 if (len
< PPP_HDRLEN
) {
945 MAINDEBUG(("io(): Received short packet."));
949 p
+= 2; /* Skip address and control */
950 GETSHORT(protocol
, p
);
954 * Toss all non-LCP packets unless LCP is OPEN.
956 if (protocol
!= PPP_LCP
&& lcp_fsm
[0].state
!= OPENED
) {
957 MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
962 * Until we get past the authentication phase, toss all packets
963 * except LCP, LQR and authentication packets.
965 if (phase
<= PHASE_AUTHENTICATE
966 && !(protocol
== PPP_LCP
|| protocol
== PPP_LQR
967 || protocol
== PPP_PAP
|| protocol
== PPP_CHAP
)) {
968 MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
974 * Upcall the proper protocol input routine.
976 for (i
= 0; (protp
= protocols
[i
]) != NULL
; ++i
) {
977 if (protp
->protocol
== protocol
&& protp
->enabled_flag
) {
978 (*protp
->input
)(0, p
, len
);
981 if (protocol
== (protp
->protocol
& ~0x8000) && protp
->enabled_flag
982 && protp
->datainput
!= NULL
) {
983 (*protp
->datainput
)(0, p
, len
);
989 const char *pname
= protocol_name(protocol
);
991 warn("Unsupported protocol '%s' (0x%x) received", pname
, protocol
);
993 warn("Unsupported protocol 0x%x received", protocol
);
995 lcp_sprotrej(0, p
- PPP_HDRLEN
, len
+ PPP_HDRLEN
);
999 * new_phase - signal the start of a new phase of pppd's operation.
1007 (*new_phase_hook
)(p
);
1008 notify(phasechange
, p
);
1012 * die - clean up state and exit with the specified status.
1019 notify(exitnotify
, status
);
1020 syslog(LOG_INFO
, "Exit.");
1025 * cleanup - restore anything which needs to be restored before we exit
1034 the_channel
->disestablish_ppp(devfd
);
1035 if (the_channel
->cleanup
)
1036 (*the_channel
->cleanup
)();
1038 if (pidfilename
[0] != 0 && unlink(pidfilename
) < 0 && errno
!= ENOENT
)
1039 warn("unable to delete pid file %s: %m", pidfilename
);
1041 if (linkpidfile
[0] != 0 && unlink(linkpidfile
) < 0 && errno
!= ENOENT
)
1042 warn("unable to delete pid file %s: %m", linkpidfile
);
1050 * update_link_stats - get stats at link termination.
1053 update_link_stats(u
)
1059 if (!get_ppp_stats(u
, &link_stats
)
1060 || gettimeofday(&now
, NULL
) < 0)
1062 link_connect_time
= now
.tv_sec
- start_time
.tv_sec
;
1063 link_stats_valid
= 1;
1065 slprintf(numbuf
, sizeof(numbuf
), "%d", link_connect_time
);
1066 script_setenv("CONNECT_TIME", numbuf
, 0);
1067 slprintf(numbuf
, sizeof(numbuf
), "%d", link_stats
.bytes_out
);
1068 script_setenv("BYTES_SENT", numbuf
, 0);
1069 slprintf(numbuf
, sizeof(numbuf
), "%d", link_stats
.bytes_in
);
1070 script_setenv("BYTES_RCVD", numbuf
, 0);
1075 struct timeval c_time
; /* time at which to call routine */
1076 void *c_arg
; /* argument to routine */
1077 void (*c_func
) __P((void *)); /* routine */
1078 struct callout
*c_next
;
1081 static struct callout
*callout
= NULL
; /* Callout list */
1082 static struct timeval timenow
; /* Current time */
1085 * timeout - Schedule a timeout.
1087 * Note that this timeout takes the number of milliseconds, NOT hz (as in
1091 timeout(func
, arg
, secs
, usecs
)
1092 void (*func
) __P((void *));
1096 struct callout
*newp
, *p
, **pp
;
1098 MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func
, arg
,
1099 time
/ 1000, time
% 1000));
1104 if ((newp
= (struct callout
*) malloc(sizeof(struct callout
))) == NULL
)
1105 fatal("Out of memory in timeout()!");
1107 newp
->c_func
= func
;
1108 gettimeofday(&timenow
, NULL
);
1109 newp
->c_time
.tv_sec
= timenow
.tv_sec
+ secs
;
1110 newp
->c_time
.tv_usec
= timenow
.tv_usec
+ usecs
;
1111 if (newp
->c_time
.tv_usec
>= 1000000) {
1112 newp
->c_time
.tv_sec
+= newp
->c_time
.tv_usec
/ 1000000;
1113 newp
->c_time
.tv_usec
%= 1000000;
1117 * Find correct place and link it in.
1119 for (pp
= &callout
; (p
= *pp
); pp
= &p
->c_next
)
1120 if (newp
->c_time
.tv_sec
< p
->c_time
.tv_sec
1121 || (newp
->c_time
.tv_sec
== p
->c_time
.tv_sec
1122 && newp
->c_time
.tv_usec
< p
->c_time
.tv_usec
))
1130 * untimeout - Unschedule a timeout.
1133 untimeout(func
, arg
)
1134 void (*func
) __P((void *));
1137 struct callout
**copp
, *freep
;
1139 MAINDEBUG(("Untimeout %p:%p.", func
, arg
));
1142 * Find first matching timeout and remove it from the list.
1144 for (copp
= &callout
; (freep
= *copp
); copp
= &freep
->c_next
)
1145 if (freep
->c_func
== func
&& freep
->c_arg
== arg
) {
1146 *copp
= freep
->c_next
;
1147 free((char *) freep
);
1154 * calltimeout - Call any timeout routines which are now due.
1161 while (callout
!= NULL
) {
1164 if (gettimeofday(&timenow
, NULL
) < 0)
1165 fatal("Failed to get time of day: %m");
1166 if (!(p
->c_time
.tv_sec
< timenow
.tv_sec
1167 || (p
->c_time
.tv_sec
== timenow
.tv_sec
1168 && p
->c_time
.tv_usec
<= timenow
.tv_usec
)))
1169 break; /* no, it's not time yet */
1171 callout
= p
->c_next
;
1172 (*p
->c_func
)(p
->c_arg
);
1180 * timeleft - return the length of time until the next timeout is due.
1182 static struct timeval
*
1184 struct timeval
*tvp
;
1186 if (callout
== NULL
)
1189 gettimeofday(&timenow
, NULL
);
1190 tvp
->tv_sec
= callout
->c_time
.tv_sec
- timenow
.tv_sec
;
1191 tvp
->tv_usec
= callout
->c_time
.tv_usec
- timenow
.tv_usec
;
1192 if (tvp
->tv_usec
< 0) {
1193 tvp
->tv_usec
+= 1000000;
1196 if (tvp
->tv_sec
< 0)
1197 tvp
->tv_sec
= tvp
->tv_usec
= 0;
1204 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1210 struct sigaction act
, oldact
;
1212 act
.sa_handler
= SIG_IGN
;
1215 sigaction(sig
, &act
, &oldact
);
1216 sigaction(sig
, &oldact
, NULL
);
1221 * hup - Catch SIGHUP signal.
1223 * Indicates that the physical layer has been disconnected.
1224 * We don't rely on this indication; if the user has sent this
1225 * signal, we just take the link down.
1231 info("Hangup (SIGHUP)");
1234 /* Send the signal to the [dis]connector process(es) also */
1236 notify(sigreceived
, sig
);
1238 siglongjmp(sigjmp
, 1);
1243 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1245 * Indicates that we should initiate a graceful disconnect and exit.
1252 info("Terminating on signal %d.", sig
);
1255 /* Send the signal to the [dis]connector process(es) also */
1257 notify(sigreceived
, sig
);
1259 siglongjmp(sigjmp
, 1);
1264 * chld - Catch SIGCHLD signal.
1265 * Sets a flag so we will call reap_kids in the mainline.
1273 siglongjmp(sigjmp
, 1);
1278 * toggle_debug - Catch SIGUSR1 signal.
1280 * Toggle debug flag.
1289 setlogmask(LOG_UPTO(LOG_DEBUG
));
1291 setlogmask(LOG_UPTO(LOG_WARNING
));
1297 * open_ccp - Catch SIGUSR2 signal.
1299 * Try to (re)negotiate compression.
1308 siglongjmp(sigjmp
, 1);
1313 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1319 static int crashed
= 0;
1324 error("Fatal signal %d", sig
);
1326 kill_my_pg(SIGTERM
);
1327 notify(sigreceived
, sig
);
1333 * device_script - run a program to talk to the specified fds
1334 * (e.g. to run the connector or disconnector script).
1335 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1338 device_script(program
, in
, out
, dont_wait
)
1352 error("Failed to create child process: %m");
1358 record_child(pid
, program
, NULL
, NULL
);
1361 while (waitpid(pid
, &status
, 0) < 0) {
1364 fatal("error waiting for (dis)connection process: %m");
1368 return (status
== 0 ? 0 : -1);
1371 /* here we are executing in the child */
1372 /* make sure fds 0, 1, 2 are occupied */
1373 while ((fd
= dup(in
)) >= 0) {
1380 /* dup in and out to fds > 2 */
1383 if (log_to_fd
>= 0) {
1384 errfd
= dup(log_to_fd
);
1386 errfd
= open(_PATH_CONNERRS
, O_WRONLY
| O_APPEND
| O_CREAT
, 0600);
1389 /* close fds 0 - 2 and any others we can think of */
1394 if (the_channel
->close
)
1395 (*the_channel
->close
)();
1398 /* dup the in, out, err fds to 0, 1, 2 */
1409 if (getuid() != uid
) {
1410 error("setuid failed");
1414 execl("/bin/sh", "sh", "-c", program
, (char *)0);
1415 error("could not exec /bin/sh: %m");
1422 * run-program - execute a program with given arguments,
1423 * but don't wait for it.
1424 * If the program can't be executed, logs an error unless
1425 * must_exist is 0 and the program file doesn't exist.
1426 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1427 * or isn't an executable plain file, or the process ID of the child.
1428 * If done != NULL, (*done)(arg) will be called later (within
1429 * reap_kids) iff the return value is > 0.
1432 run_program(prog
, args
, must_exist
, done
, arg
)
1436 void (*done
) __P((void *));
1443 * First check if the file exists and is executable.
1444 * We don't use access() because that would use the
1445 * real user-id, which might not be root, and the script
1446 * might be accessible only to root.
1449 if (stat(prog
, &sbuf
) < 0 || !S_ISREG(sbuf
.st_mode
)
1450 || (sbuf
.st_mode
& (S_IXUSR
|S_IXGRP
|S_IXOTH
)) == 0) {
1451 if (must_exist
|| errno
!= ENOENT
)
1452 warn("Can't execute %s: %m", prog
);
1458 error("Failed to create child process for %s: %m", prog
);
1464 /* Leave the current location */
1465 (void) setsid(); /* No controlling tty. */
1466 (void) umask (S_IRWXG
|S_IRWXO
);
1467 (void) chdir ("/"); /* no current directory. */
1468 setuid(0); /* set real UID = root */
1471 /* Ensure that nothing of our device environment is inherited. */
1477 if (the_channel
->close
)
1478 (*the_channel
->close
)();
1480 /* Don't pass handles to the PPP device, even by accident. */
1481 new_fd
= open (_PATH_DEVNULL
, O_RDWR
);
1484 dup2 (new_fd
, 0); /* stdin <- /dev/null */
1487 dup2 (0, 1); /* stdout -> /dev/null */
1488 dup2 (0, 2); /* stderr -> /dev/null */
1492 /* Force the priority back to zero if pppd is running higher. */
1493 if (setpriority (PRIO_PROCESS
, 0, 0) < 0)
1494 warn("can't reset priority to 0: %m");
1497 /* SysV recommends a second fork at this point. */
1499 /* run the program */
1500 execve(prog
, args
, script_env
);
1501 if (must_exist
|| errno
!= ENOENT
) {
1502 /* have to reopen the log, there's nowhere else
1503 for the message to go. */
1505 syslog(LOG_ERR
, "Can't execute %s: %m", prog
);
1512 dbglog("Script %s started (pid %d)", prog
, pid
);
1513 record_child(pid
, prog
, done
, arg
);
1520 * record_child - add a child process to the list for reap_kids
1524 record_child(pid
, prog
, done
, arg
)
1527 void (*done
) __P((void *));
1530 struct subprocess
*chp
;
1534 chp
= (struct subprocess
*) malloc(sizeof(struct subprocess
));
1536 warn("losing track of %s process", prog
);
1542 chp
->next
= children
;
1549 * reap_kids - get status from any dead child processes,
1550 * and log a message for abnormal terminations.
1557 struct subprocess
*chp
, **prevp
;
1559 if (n_children
== 0)
1561 while ((pid
= waitpid(-1, &status
, (waitfor
? 0: WNOHANG
))) != -1
1563 for (prevp
= &children
; (chp
= *prevp
) != NULL
; prevp
= &chp
->next
) {
1564 if (chp
->pid
== pid
) {
1570 if (WIFSIGNALED(status
)) {
1571 warn("Child process %s (pid %d) terminated with signal %d",
1572 (chp
? chp
->prog
: "??"), pid
, WTERMSIG(status
));
1574 dbglog("Script %s finished (pid %d), status = 0x%x",
1575 (chp
? chp
->prog
: "??"), pid
, status
);
1576 if (chp
&& chp
->done
)
1577 (*chp
->done
)(chp
->arg
);
1582 if (errno
== ECHILD
)
1585 error("Error waiting for child process: %m");
1591 * add_notifier - add a new function to be called when something happens.
1594 add_notifier(notif
, func
, arg
)
1595 struct notifier
**notif
;
1599 struct notifier
*np
;
1601 np
= malloc(sizeof(struct notifier
));
1603 novm("notifier struct");
1611 * remove_notifier - remove a function from the list of things to
1612 * be called when something happens.
1615 remove_notifier(notif
, func
, arg
)
1616 struct notifier
**notif
;
1620 struct notifier
*np
;
1622 for (; (np
= *notif
) != 0; notif
= &np
->next
) {
1623 if (np
->func
== func
&& np
->arg
== arg
) {
1632 * notify - call a set of functions registered with add_notify.
1636 struct notifier
*notif
;
1639 struct notifier
*np
;
1641 while ((np
= notif
) != 0) {
1643 (*np
->func
)(np
->arg
, val
);
1648 * novm - log an error message saying we ran out of memory, and die.
1654 fatal("Virtual memory exhausted allocating %s\n", msg
);
1658 * script_setenv - set an environment variable value to be used
1659 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1662 script_setenv(var
, value
, iskey
)
1666 size_t varl
= strlen(var
);
1667 size_t vl
= varl
+ strlen(value
) + 2;
1669 char *p
, *newstring
;
1671 newstring
= (char *) malloc(vl
+1);
1674 *newstring
++ = iskey
;
1675 slprintf(newstring
, vl
, "%s=%s", var
, value
);
1677 /* check if this variable is already set */
1678 if (script_env
!= 0) {
1679 for (i
= 0; (p
= script_env
[i
]) != 0; ++i
) {
1680 if (strncmp(p
, var
, varl
) == 0 && p
[varl
] == '=') {
1681 if (p
[-1] && pppdb
!= NULL
)
1684 script_env
[i
] = newstring
;
1685 if (iskey
&& pppdb
!= NULL
)
1686 add_db_key(newstring
);
1692 /* no space allocated for script env. ptrs. yet */
1694 script_env
= (char **) malloc(16 * sizeof(char *));
1695 if (script_env
== 0)
1700 /* reallocate script_env with more space if needed */
1701 if (i
+ 1 >= s_env_nalloc
) {
1703 char **newenv
= (char **) realloc((void *)script_env
,
1704 new_n
* sizeof(char *));
1707 script_env
= newenv
;
1708 s_env_nalloc
= new_n
;
1711 script_env
[i
] = newstring
;
1712 script_env
[i
+1] = 0;
1714 if (pppdb
!= NULL
) {
1716 add_db_key(newstring
);
1722 * script_unsetenv - remove a variable from the environment
1726 script_unsetenv(var
)
1729 int vl
= strlen(var
);
1733 if (script_env
== 0)
1735 for (i
= 0; (p
= script_env
[i
]) != 0; ++i
) {
1736 if (strncmp(p
, var
, vl
) == 0 && p
[vl
] == '=') {
1737 if (p
[-1] && pppdb
!= NULL
)
1740 while ((script_env
[i
] = script_env
[i
+1]) != 0)
1750 * update_db_entry - update our entry in the database.
1759 if (script_env
== NULL
)
1762 for (i
= 0; (p
= script_env
[i
]) != 0; ++i
)
1763 vlen
+= strlen(p
) + 1;
1764 vbuf
= malloc(vlen
);
1766 novm("database entry");
1768 for (i
= 0; (p
= script_env
[i
]) != 0; ++i
)
1769 q
+= slprintf(q
, vbuf
+ vlen
- q
, "%s;", p
);
1772 key
.dsize
= strlen(db_key
);
1775 if (tdb_store(pppdb
, key
, dbuf
, TDB_REPLACE
))
1776 error("tdb_store failed: %s", tdb_error(pppdb
));
1781 * add_db_key - add a key that we can use to look up our database entry.
1789 key
.dptr
= (char *) str
;
1790 key
.dsize
= strlen(str
);
1792 dbuf
.dsize
= strlen(db_key
);
1793 if (tdb_store(pppdb
, key
, dbuf
, TDB_REPLACE
))
1794 error("tdb_store key failed: %s", tdb_error(pppdb
));
1798 * delete_db_key - delete a key for looking up our database entry.
1806 key
.dptr
= (char *) str
;
1807 key
.dsize
= strlen(str
);
1808 tdb_delete(pppdb
, key
);
1812 * cleanup_db - delete all the entries we put in the database.
1822 key
.dsize
= strlen(db_key
);
1823 tdb_delete(pppdb
, key
);
1824 for (i
= 0; (p
= script_env
[i
]) != 0; ++i
)