2 * sys-linux.c - System-dependent procedures for setting up
3 * PPP interfaces on Linux systems
5 * Copyright (c) 1989 Carnegie Mellon University.
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by Carnegie Mellon University. The name of the
14 * University may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 #include <sys/ioctl.h>
22 #include <sys/types.h>
23 #include <sys/socket.h>
25 #include <sys/errno.h>
41 /* This is in netdevice.h. However, this compile will fail miserably if
42 you attempt to include netdevice.h because it has so many references
43 to __memcpy functions which it should not attempt to do. So, since I
44 really don't use it, but it must be defined, define it now. */
47 #define MAX_ADDR_LEN 7
51 #include <linux/ppp_defs.h>
52 #include <net/if_arp.h>
53 #include <linux/if_ppp.h>
54 #include <net/route.h>
55 #include <linux/if_ether.h>
56 #include <netinet/in.h>
66 #define ok_error(num) ((num)==EIO)
68 static int tty_disc = N_TTY; /* The TTY discipline */
69 static int ppp_disc = N_PPP; /* The PPP discpline */
70 static int initfdflags = -1; /* Initial file descriptor flags for fd */
71 static int ppp_fd = -1; /* fd which is set to PPP discipline */
72 static int sock_fd = -1; /* socket for doing interface ioctls */
73 static int slave_fd = -1;
74 static int master_fd = -1;
76 static int has_proxy_arp = 0;
77 static int driver_version = 0;
78 static int driver_modification = 0;
79 static int driver_patch = 0;
80 static int restore_term = 0; /* 1 => we've munged the terminal */
81 static struct termios inittermios; /* Initial TTY termios */
83 static char loop_name[20];
84 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
86 static int if_is_up; /* Interface has been marked up */
87 static u_int32_t default_route_gateway; /* Gateway for default route added */
88 static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
90 static char *lock_file;
94 #define FLAGS_GOOD (IFF_UP | IFF_BROADCAST)
95 #define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \
96 IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP)
98 /* Prototypes for procedures local to this file. */
99 static int get_flags (void);
100 static void set_flags (int flags);
101 static int translate_speed (int bps);
102 static int baud_rate_of (int speed);
103 static char *path_to_route (void);
104 static void close_route_table (void);
105 static int open_route_table (void);
106 static int read_route_table (struct rtentry *rt);
107 static int defaultroute_exists (struct rtentry *rt);
108 static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr,
110 static void decode_version (char *buf, int *version, int *mod, int *patch);
112 extern u_char inpacket_buf[]; /* borrowed from main.c */
115 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
119 #define SET_SA_FAMILY(addr, family) \
120 memset ((char *) &(addr), '\0', sizeof(addr)); \
121 addr.sa_family = (family);
124 * Determine if the PPP connection should still be present.
128 #define still_ppp() (hungup == 0)
131 #define LOCK_PREFIX "/var/lock/LCK.."
134 /********************************************************************
136 * Functions to read and set the flags value in the device driver
139 static void set_ppp_fd (int new_fd)
141 SYSDEBUG ((LOG_DEBUG, "setting ppp_fd to %d\n", ppp_fd));
145 /********************************************************************
147 * Functions to read and set the flags value in the device driver
150 static int get_flags (void)
154 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0)
156 if ( ok_error (errno) )
162 syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
167 SYSDEBUG ((LOG_DEBUG, "get flags = %x\n", flags));
171 /********************************************************************/
173 static void set_flags (int flags)
175 SYSDEBUG ((LOG_DEBUG, "set flags = %x\n", flags));
177 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
179 if (! ok_error (errno) )
181 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS, %x): %m(%d)", flags, errno);
187 /********************************************************************
189 * sys_init - System-dependent initialization.
194 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
195 setlogmask(LOG_UPTO(LOG_INFO));
198 setlogmask(LOG_UPTO(LOG_DEBUG));
201 /* Get an internet socket for doing socket ioctls. */
202 sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
205 if ( ! ok_error ( errno ))
207 syslog(LOG_ERR, "Couldn't create IP socket: %m(%d)", errno);
213 /********************************************************************
215 * sys_cleanup - restore any system state we modified before exiting:
216 * mark the interface down, delete default route and/or proxy arp entry.
217 * This should call die() because it's called from die().
220 void sys_cleanup(void)
224 * Take down the device
231 * Delete any routes through the device.
233 if (default_route_gateway != 0)
235 cifdefaultroute(0, default_route_gateway);
240 cifproxyarp(0, proxy_arp_addr);
244 /********************************************************************
246 * sys_close - Clean up in a child process before execing.
256 /********************************************************************
258 * note_debug_level - note a change in the debug level.
261 void note_debug_level (void)
265 SYSDEBUG ((LOG_INFO, "Debug turned ON, Level %d", debug));
266 setlogmask(LOG_UPTO(LOG_DEBUG));
270 setlogmask(LOG_UPTO(LOG_WARNING));
274 /********************************************************************
276 * set_kdebugflag - Define the debugging level for the kernel
279 int set_kdebugflag (int requested_level)
281 if (ioctl(ppp_fd, PPPIOCSDEBUG, &requested_level) < 0)
283 if ( ! ok_error (errno) )
285 syslog (LOG_ERR, "ioctl(PPPIOCSDEBUG): %m");
289 SYSDEBUG ((LOG_INFO, "set kernel debugging level to %d",
294 /********************************************************************
296 * establish_ppp - Turn the serial port into a ppp interface.
299 void establish_ppp (int tty_fd)
303 * The current PPP device will be the tty file.
307 * Ensure that the tty device is in exclusive mode.
309 if (ioctl(tty_fd, TIOCEXCL, 0) < 0)
311 if ( ! ok_error ( errno ))
313 syslog (LOG_WARNING, "ioctl(TIOCEXCL): %m");
317 * Demand mode - prime the old ppp device to relinquish the unit.
319 if (demand && ioctl(slave_fd, PPPIOCXFERUNIT, 0) < 0)
321 syslog(LOG_ERR, "ioctl(transfer ppp unit): %m(%d)", errno);
325 * Set the current tty to the PPP discpline
327 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
329 if ( ! ok_error (errno) )
331 syslog(LOG_ERR, "ioctl(TIOCSETD): %m(%d)", errno);
336 * Find out which interface we were given.
338 if (ioctl(ppp_fd, PPPIOCGUNIT, &x) < 0)
340 if ( ! ok_error (errno))
342 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m(%d)", errno);
347 * Check that we got the same unit again.
353 syslog(LOG_ERR, "transfer_ppp failed: wanted unit %d, got %d",
361 * Enable debug in the driver if requested.
364 set_kdebugflag (kdebugflag);
366 set_flags (get_flags() & ~(SC_RCV_B7_0 | SC_RCV_B7_1 |
367 SC_RCV_EVNP | SC_RCV_ODDP));
369 SYSDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver",
370 driver_version, driver_modification, driver_patch));
372 * Fetch the initial file flags and reset blocking mode on the file.
374 initfdflags = fcntl(ppp_fd, F_GETFL);
376 if (initfdflags == -1 ||
377 fcntl(ppp_fd, F_SETFL, initfdflags | O_NONBLOCK) == -1)
379 if ( ! ok_error (errno))
382 "Couldn't set device to non-blocking mode: %m");
387 /********************************************************************
389 * disestablish_ppp - Restore the serial port to normal operation.
390 * This shouldn't call die() because it's called from die().
393 void disestablish_ppp(int tty_fd)
399 * Attempt to restore the previous tty settings
404 * Restore the previous line discipline
406 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0)
408 if ( ! ok_error (errno))
410 syslog(LOG_ERR, "ioctl(TIOCSETD, N_TTY): %m");
414 if (ioctl(tty_fd, TIOCNXCL, 0) < 0)
416 if ( ! ok_error (errno))
418 syslog (LOG_WARNING, "ioctl(TIOCNXCL): %m(%d)", errno);
422 /* Reset non-blocking mode on fd. */
423 if (initfdflags != -1 && fcntl(tty_fd, F_SETFL, initfdflags) < 0)
425 if ( ! ok_error (errno))
428 "Couldn't restore device fd flags: %m");
435 /********************************************************************
437 * clean_check - Fetch the flags for the device and generate
438 * appropriate error messages.
440 void clean_check(void)
447 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0)
450 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP))
453 case SC_RCV_B7_0 | SC_RCV_EVNP:
454 case SC_RCV_B7_0 | SC_RCV_ODDP:
455 case SC_RCV_B7_0 | SC_RCV_ODDP | SC_RCV_EVNP:
456 s = "all had bit 7 set to 1";
460 case SC_RCV_B7_1 | SC_RCV_EVNP:
461 case SC_RCV_B7_1 | SC_RCV_ODDP:
462 case SC_RCV_B7_1 | SC_RCV_ODDP | SC_RCV_EVNP:
463 s = "all had bit 7 set to 0";
467 s = "all had odd parity";
471 s = "all had even parity";
477 syslog(LOG_WARNING, "Receive serial link is not"
479 syslog(LOG_WARNING, "Problem: %s", s);
487 * List of valid speeds.
491 int speed_int, speed_val;
562 /********************************************************************
564 * Translate from bits/second to a speed_t.
567 static int translate_speed (int bps)
569 struct speed *speedp;
573 for (speedp = speeds; speedp->speed_int; speedp++)
575 if (bps == speedp->speed_int)
577 return speedp->speed_val;
580 syslog(LOG_WARNING, "speed %d not supported", bps);
585 /********************************************************************
587 * Translate from a speed_t to bits/second.
590 static int baud_rate_of (int speed)
592 struct speed *speedp;
596 for (speedp = speeds; speedp->speed_int; speedp++)
598 if (speed == speedp->speed_val)
600 return speedp->speed_int;
607 /********************************************************************
609 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
610 * at the requested speed, etc. If `local' is true, set CLOCAL
611 * regardless of whether the modem option was specified.
614 void set_up_tty (int tty_fd, int local)
619 if (tcgetattr(tty_fd, &tios) < 0)
621 syslog(LOG_ERR, "tcgetattr: %m(%d)", errno);
630 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
631 tios.c_cflag |= CS8 | CREAD | HUPCL;
633 tios.c_iflag = IGNBRK | IGNPAR;
637 tios.c_cc[VTIME] = 0;
641 tios.c_cflag ^= (CLOCAL | HUPCL);
647 tios.c_cflag |= CRTSCTS;
651 tios.c_iflag |= IXON | IXOFF;
652 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
653 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
657 tios.c_cflag &= ~CRTSCTS;
664 speed = translate_speed(inspeed);
667 cfsetospeed (&tios, speed);
668 cfsetispeed (&tios, speed);
671 * We can't proceed if the serial port speed is B0,
672 * since that implies that the serial port is disabled.
676 speed = cfgetospeed(&tios);
679 syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
685 if (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0)
687 syslog(LOG_ERR, "tcsetattr: %m");
691 baud_rate = baud_rate_of(speed);
695 /********************************************************************
697 * setdtr - control the DTR line on the serial port.
698 * This is called from die(), so it shouldn't call die().
701 void setdtr (int tty_fd, int on)
703 int modembits = TIOCM_DTR;
705 ioctl(tty_fd, (on ? TIOCMBIS : TIOCMBIC), &modembits);
708 /********************************************************************
710 * restore_tty - restore the terminal to the saved settings.
713 void restore_tty (int tty_fd)
719 * Turn off echoing, because otherwise we can get into
720 * a loop with the tty and the modem echoing to each other.
721 * We presume we are the sole user of this tty device, so
722 * when we close it, it will revert to its defaults anyway.
726 inittermios.c_lflag &= ~(ECHO | ECHONL);
729 if (tcsetattr(tty_fd, TCSAFLUSH, &inittermios) < 0)
731 if (! ok_error (errno))
733 syslog(LOG_WARNING, "tcsetattr: %m");
739 /********************************************************************
741 * output - Output PPP packet.
744 void output (int unit, unsigned char *p, int len)
748 log_packet(p, len, "sent ");
751 if (write(ppp_fd, p, len) < 0)
753 if (errno == EWOULDBLOCK || errno == ENOBUFS
754 || errno == ENXIO || errno == EIO)
756 syslog(LOG_WARNING, "write: warning: %m(%d)", errno);
760 syslog(LOG_ERR, "write: %m(%d)", errno);
766 /********************************************************************
768 * wait_input - wait until there is data available on ppp_fd,
769 * for the length of time specified by *timo (indefinite
773 void wait_input (struct timeval *timo)
779 FD_SET(ppp_fd, &ready);
781 n = select(ppp_fd + 1, &ready, NULL, &ready, timo);
782 if (n < 0 && errno != EINTR)
784 syslog(LOG_ERR, "select: %m(%d)", errno);
789 /********************************************************************
791 * wait_loop_output - wait until there is data available on the
792 * loopback, for the length of time specified by *timo (indefinite
795 void wait_loop_output(timo)
796 struct timeval *timo;
802 FD_SET(master_fd, &ready);
803 n = select(master_fd + 1, &ready, NULL, &ready, timo);
804 if (n < 0 && errno != EINTR)
806 syslog(LOG_ERR, "select: %m(%d)", errno);
811 /********************************************************************
813 * wait_time - wait for a given length of time or until a
814 * signal is received.
818 struct timeval *timo;
822 n = select(0, NULL, NULL, NULL, timo);
823 if (n < 0 && errno != EINTR) {
824 syslog(LOG_ERR, "select: %m(%d)", errno);
829 /********************************************************************
831 * read_packet - get a PPP packet from the serial device.
834 int read_packet (unsigned char *buf)
838 len = read(ppp_fd, buf, PPP_MTU + PPP_HDRLEN);
841 if (errno == EWOULDBLOCK)
845 syslog(LOG_ERR, "read: %m(%d)", errno);
851 /********************************************************************
853 * get_loop_output - get outgoing packets from the ppp device,
854 * and detect when we want to bring the real link up.
855 * Return value is 1 if we need to bring up the link, 0 otherwise.
858 get_loop_output(void)
861 int n = read(master_fd, inbuf, sizeof(inbuf));
865 if (loop_chars(inbuf, n))
869 n = read(master_fd, inbuf, sizeof(inbuf));
874 syslog(LOG_ERR, "eof on loopback");
878 if (errno != EWOULDBLOCK)
880 syslog(LOG_ERR, "read from loopback: %m(%d)", errno);
887 /********************************************************************
889 * ppp_send_config - configure the transmit characteristics of
893 void ppp_send_config (int unit,int mtu,u_int32_t asyncmap,int pcomp,int accomp)
898 SYSDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu));
900 * Ensure that the link is still up.
905 * Set the MTU and other parameters for the ppp device
907 memset (&ifr, '\0', sizeof (ifr));
908 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
911 if (ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
913 syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m(%d)", errno);
917 SYSDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
918 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0)
920 syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m(%d)", errno);
925 x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
926 x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
931 /********************************************************************
933 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
936 void ppp_set_xaccm (int unit, ext_accm accm)
938 SYSDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
939 accm[0], accm[1], accm[2], accm[3]));
941 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
943 if ( ! ok_error (errno))
945 syslog(LOG_WARNING, "ioctl(set extended ACCM): %m(%d)", errno);
950 /********************************************************************
952 * ppp_recv_config - configure the receive-side characteristics of
956 void ppp_recv_config (int unit,int mru,u_int32_t asyncmap,int pcomp,int accomp)
960 SYSDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
962 * If we were called because the link has gone down then there is nothing
963 * which may be done. Just return without incident.
970 * Set the receiver parameters
972 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
974 if ( ! ok_error (errno))
976 syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m(%d)", errno);
980 SYSDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
981 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0)
983 syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m(%d)", errno);
988 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
992 /********************************************************************
994 * ccp_test - ask kernel whether a given compression method
995 * is acceptable for use.
998 int ccp_test (int unit, u_char *opt_ptr, int opt_len, int for_transmit)
1000 struct ppp_option_data data;
1002 memset (&data, '\0', sizeof (data));
1004 data.length = opt_len;
1005 data.transmit = for_transmit;
1007 if (ioctl(ppp_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
1012 return (errno == ENOBUFS)? 0: -1;
1015 /********************************************************************
1017 * ccp_flags_set - inform kernel about the current state of CCP.
1020 void ccp_flags_set (int unit, int isopen, int isup)
1024 int x = get_flags();
1025 x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN;
1026 x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP;
1031 /********************************************************************
1033 * get_idle_time - return how long the link has been idle.
1036 get_idle_time(u, ip)
1038 struct ppp_idle *ip;
1040 return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
1043 /********************************************************************
1045 * ccp_fatal_error - returns 1 if decompression was disabled as a
1046 * result of an error detected after decompression of a packet,
1047 * 0 otherwise. This is necessary because of patent nonsense.
1050 int ccp_fatal_error (int unit)
1052 int x = get_flags();
1054 return x & SC_DC_FERROR;
1058 * path_to_route - determine the path to the proc file system data
1061 FILE *route_fd = (FILE *) 0;
1062 static char route_buffer [512];
1064 static char *path_to_route (void);
1065 static int open_route_table (void);
1066 static void close_route_table (void);
1067 static int read_route_table (struct rtentry *rt);
1069 /********************************************************************
1071 * path_to_procfs - find the path to the proc file system mount point
1074 static int path_to_procfs (void)
1076 struct mntent *mntent;
1079 fp = fopen (MOUNTED, "r");
1082 mntent = getmntent (fp);
1083 while (mntent != (struct mntent *) 0)
1085 if (strcmp (mntent->mnt_type, MNTTYPE_IGNORE) != 0)
1087 if (strcmp (mntent->mnt_type, "proc") == 0)
1089 strncpy (route_buffer, mntent->mnt_dir,
1090 sizeof (route_buffer)-10);
1091 route_buffer [sizeof (route_buffer)-10] = '\0';
1096 mntent = getmntent (fp);
1103 /********************************************************************
1105 * path_to_route - find the path to the route tables in the proc file system
1108 static char *path_to_route (void)
1110 if (! path_to_procfs())
1112 syslog (LOG_ERR, "proc file system not mounted");
1115 strcat (route_buffer, "/net/route");
1116 return (route_buffer);
1119 /********************************************************************
1121 * close_route_table - close the interface to the route table
1124 static void close_route_table (void)
1126 if (route_fd != (FILE *) 0)
1129 route_fd = (FILE *) 0;
1133 /********************************************************************
1135 * open_route_table - open the interface to the route table
1138 static int open_route_table (void)
1142 close_route_table();
1144 path = path_to_route();
1150 route_fd = fopen (path, "r");
1151 if (route_fd == (FILE *) 0)
1153 syslog (LOG_ERR, "can not open %s: %m(%d)", path, errno);
1159 /********************************************************************
1161 * read_route_table - read the next entry from the route table
1164 static int read_route_table (struct rtentry *rt)
1166 static char delims[] = " \t\n";
1167 char *dev_ptr, *ptr, *dst_ptr, *gw_ptr, *flag_ptr;
1169 memset (rt, '\0', sizeof (struct rtentry));
1173 if (fgets (route_buffer, sizeof (route_buffer), route_fd) ==
1179 dev_ptr = strtok (route_buffer, delims); /* interface name */
1180 dst_ptr = strtok (NULL, delims); /* destination address */
1181 gw_ptr = strtok (NULL, delims); /* gateway */
1182 flag_ptr = strtok (NULL, delims); /* flags */
1184 if (flag_ptr == (char *) 0) /* assume that we failed, somewhere. */
1189 /* Discard that stupid header line which should never
1190 * have been there in the first place !! */
1191 if (isxdigit (*dst_ptr) && isxdigit (*gw_ptr) && isxdigit (*flag_ptr))
1197 ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr =
1198 strtoul (dst_ptr, NULL, 16);
1200 ((struct sockaddr_in *) &rt->rt_gateway)->sin_addr.s_addr =
1201 strtoul (gw_ptr, NULL, 16);
1203 rt->rt_flags = (short) strtoul (flag_ptr, NULL, 16);
1204 rt->rt_dev = dev_ptr;
1209 /********************************************************************
1211 * defaultroute_exists - determine if there is a default route
1214 static int defaultroute_exists (struct rtentry *rt)
1218 if (!open_route_table())
1223 while (read_route_table(rt) != 0)
1225 if ((rt->rt_flags & RTF_UP) == 0)
1230 if (((struct sockaddr_in *) (&rt->rt_dst))->sin_addr.s_addr == 0L)
1237 close_route_table();
1241 /********************************************************************
1243 * sifdefaultroute - assign a default route through the address given.
1246 int sifdefaultroute (int unit, u_int32_t gateway)
1250 if (defaultroute_exists(&rt))
1252 u_int32_t old_gateway = ((struct sockaddr_in *) (&rt.rt_gateway))->
1255 if (old_gateway != gateway)
1258 "ppp not replacing existing default route to %s[%s]",
1260 inet_ntoa (old_gateway));
1265 memset (&rt, '\0', sizeof (rt));
1266 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1267 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1268 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
1270 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1271 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0)
1273 if ( ! ok_error ( errno ))
1275 syslog (LOG_ERR, "default route ioctl(SIOCADDRT): %m(%d)", errno);
1280 default_route_gateway = gateway;
1284 /********************************************************************
1286 * cifdefaultroute - delete a default route through the address given.
1289 int cifdefaultroute (int unit, u_int32_t gateway)
1293 default_route_gateway = 0;
1295 memset (&rt, '\0', sizeof (rt));
1296 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1297 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1298 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
1300 rt.rt_flags = RTF_UP | RTF_GATEWAY;
1301 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH)
1305 if ( ! ok_error ( errno ))
1308 "default route ioctl(SIOCDELRT): %m(%d)", errno);
1317 /********************************************************************
1319 * sifproxyarp - Make a proxy ARP entry for the peer.
1322 int sifproxyarp (int unit, u_int32_t his_adr)
1324 struct arpreq arpreq;
1326 if (has_proxy_arp == 0)
1328 memset (&arpreq, '\0', sizeof(arpreq));
1330 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1331 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
1332 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1334 * Get the hardware address of an interface on the same subnet
1335 * as our local address.
1337 if (!get_ether_addr(his_adr, &arpreq.arp_ha, arpreq.arp_dev))
1339 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
1343 if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0)
1345 if ( ! ok_error ( errno ))
1347 syslog(LOG_ERR, "ioctl(SIOCSARP): %m(%d)", errno);
1353 proxy_arp_addr = his_adr;
1358 /********************************************************************
1360 * cifproxyarp - Delete the proxy ARP entry for the peer.
1363 int cifproxyarp (int unit, u_int32_t his_adr)
1365 struct arpreq arpreq;
1367 if (has_proxy_arp == 1)
1369 memset (&arpreq, '\0', sizeof(arpreq));
1370 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1372 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
1373 if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0)
1375 if ( ! ok_error ( errno ))
1377 syslog(LOG_WARNING, "ioctl(SIOCDARP): %m(%d)", errno);
1386 /********************************************************************
1388 * get_ether_addr - get the hardware address of an interface on the
1389 * the same subnet as ipaddr.
1392 static int get_ether_addr (u_int32_t ipaddr,
1393 struct sockaddr *hwaddr,
1396 struct ifreq *ifr, *ifend, *ifp;
1398 u_int32_t ina, mask;
1399 struct sockaddr_dl *dla;
1402 struct ifreq ifs[MAX_IFS];
1404 ifc.ifc_len = sizeof(ifs);
1406 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0)
1408 if ( ! ok_error ( errno ))
1410 syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m(%d)", errno);
1415 SYSDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s",
1416 ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr)));
1418 * Scan through looking for an interface with an Internet
1419 * address on the same subnet as `ipaddr'.
1421 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
1422 for (ifr = ifc.ifc_req; ifr < ifend; ifr++)
1424 if (ifr->ifr_addr.sa_family == AF_INET)
1426 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1427 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1428 SYSDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s",
1431 * Check that the interface is up, and not point-to-point
1434 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1439 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1444 * Get its netmask and check that it's on the right subnet.
1446 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1451 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1452 SYSDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx",
1453 ip_ntoa(ina), ntohl(mask)));
1455 if (((ipaddr ^ ina) & mask) != 0)
1468 memcpy (name, ifreq.ifr_name, sizeof(ifreq.ifr_name));
1469 syslog(LOG_INFO, "found interface %s for proxy arp", name);
1471 * Now get the hardware address.
1473 memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
1474 if (ioctl (sock_fd, SIOCGIFHWADDR, &ifreq) < 0)
1476 syslog(LOG_ERR, "SIOCGIFHWADDR(%s): %m(%d)", ifreq.ifr_name, errno);
1482 sizeof (struct sockaddr));
1484 SYSDEBUG ((LOG_DEBUG,
1485 "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
1486 (int) ((unsigned char *) &hwaddr->sa_data)[0],
1487 (int) ((unsigned char *) &hwaddr->sa_data)[1],
1488 (int) ((unsigned char *) &hwaddr->sa_data)[2],
1489 (int) ((unsigned char *) &hwaddr->sa_data)[3],
1490 (int) ((unsigned char *) &hwaddr->sa_data)[4],
1491 (int) ((unsigned char *) &hwaddr->sa_data)[5],
1492 (int) ((unsigned char *) &hwaddr->sa_data)[6],
1493 (int) ((unsigned char *) &hwaddr->sa_data)[7]));
1497 /********************************************************************
1499 * Return user specified netmask, modified by any mask we might determine
1500 * for address `addr' (in network byte order).
1501 * Here we scan through the system's list of interfaces, looking for
1502 * any non-point-to-point interfaces which might appear to be on the same
1503 * network as `addr'. If we find any, we OR in their netmask to the
1504 * user-specified netmask.
1507 u_int32_t GetMask (u_int32_t addr)
1509 u_int32_t mask, nmask, ina;
1510 struct ifreq *ifr, *ifend, ifreq;
1512 struct ifreq ifs[MAX_IFS];
1516 if (IN_CLASSA(addr)) /* determine network mask for address class */
1518 nmask = IN_CLASSA_NET;
1522 if (IN_CLASSB(addr))
1524 nmask = IN_CLASSB_NET;
1528 nmask = IN_CLASSC_NET;
1532 /* class D nets are disallowed by bad_ip_adrs */
1533 mask = netmask | htonl(nmask);
1535 * Scan through the system's network interfaces.
1537 ifc.ifc_len = sizeof(ifs);
1539 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0)
1541 if ( ! ok_error ( errno ))
1543 syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m(%d)", errno);
1548 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1549 for (ifr = ifc.ifc_req; ifr < ifend; ifr++)
1552 * Check the interface's internet address.
1554 if (ifr->ifr_addr.sa_family != AF_INET)
1558 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1559 if (((ntohl(ina) ^ addr) & nmask) != 0)
1564 * Check that the interface is up, and not point-to-point nor loopback.
1566 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1567 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1572 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1577 * Get its netmask and OR it into our mask.
1579 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1583 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1589 /********************************************************************
1591 * Internal routine to decode the version.modification.patch level
1594 static void decode_version (char *buf, int *version,
1595 int *modification, int *patch)
1597 *version = (int) strtoul (buf, &buf, 10);
1604 *modification = (int) strtoul (buf, &buf, 10);
1608 *patch = (int) strtoul (buf, &buf, 10);
1620 /********************************************************************
1622 * Procedure to determine if the PPP line dicipline is registered.
1626 ppp_registered(void)
1632 local_fd = open(devnam, O_NONBLOCK | O_RDWR, 0);
1635 syslog(LOG_ERR, "Failed to open %s: %m(%d)", devnam, errno);
1639 initfdflags = fcntl(local_fd, F_GETFL);
1640 if (initfdflags == -1)
1642 syslog(LOG_ERR, "Couldn't get device fd flags: %m(%d)", errno);
1647 initfdflags &= ~O_NONBLOCK;
1648 fcntl(local_fd, F_SETFL, initfdflags);
1650 * Read the initial line dicipline and try to put the device into the
1653 if (ioctl(local_fd, TIOCGETD, &init_disc) < 0)
1655 syslog(LOG_ERR, "ioctl(TIOCGETD): %m(%d)", errno);
1660 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0)
1662 syslog(LOG_ERR, "ioctl(TIOCSETD): %m(%d)", errno);
1667 if (ioctl(local_fd, TIOCSETD, &init_disc) < 0)
1669 syslog(LOG_ERR, "ioctl(TIOCSETD): %m(%d)", errno);
1678 /********************************************************************
1680 * ppp_available - check whether the system has any ppp interfaces
1681 * (in fact we check whether we can do an ioctl on ppp0).
1684 int ppp_available(void)
1689 int my_version, my_modification, my_patch;
1690 extern char *no_ppp_msg;
1692 * Open a socket for doing the ioctl operations.
1694 s = socket(AF_INET, SOCK_DGRAM, 0);
1700 strncpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1701 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1703 * If the device did not exist then attempt to create one by putting the
1704 * current tty into the PPP discipline. If this works then obtain the
1705 * flags for the device again.
1709 if (ppp_registered())
1711 strncpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1712 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1716 * Ensure that the hardware address is for PPP and not something else
1720 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
1723 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
1731 "This system lacks kernel support for PPP. To include PPP support\n"
1732 "in the kernel, please follow the steps detailed in the "
1733 "README.linux\nfile in the ppp-2.3 distribution.\n";
1736 * This is the PPP device. Validate the version of the driver at this
1737 * point to ensure that this program will work with the driver.
1741 char abBuffer [1024];
1743 ifr.ifr_data = abBuffer;
1744 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
1749 decode_version (abBuffer,
1751 &driver_modification,
1758 driver_modification =
1762 * Validate the version of the driver against the version that we used.
1764 decode_version (PPP_VERSION,
1769 /* The version numbers must match */
1770 if (driver_version != my_version)
1775 /* The modification levels must be legal */
1776 if (driver_modification < my_modification)
1784 sprintf (route_buffer,
1785 "Sorry - PPP driver version %d.%d.%d is out of date\n",
1786 driver_version, driver_modification, driver_patch);
1788 no_ppp_msg = route_buffer;
1794 /********************************************************************
1796 * Update the wtmp file with the appropriate user name and tty device.
1799 int logwtmp (char *line, char *name, char *host)
1802 struct utmp ut, *utp;
1803 pid_t mypid = getpid();
1805 * Update the signon database for users.
1806 * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996
1808 utmpname(_PATH_UTMP);
1810 while ((utp = getutent()) && (utp->ut_pid != mypid))
1813 /* Is this call really necessary? There is another one after the 'put' */
1818 memcpy(&ut, utp, sizeof(ut));
1822 /* some gettys/telnetds don't initialize utmp... */
1823 memset(&ut, 0, sizeof(ut));
1826 if (ut.ut_id[0] == 0)
1828 strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
1831 strncpy(ut.ut_user, name, sizeof(ut.ut_user));
1832 strncpy(ut.ut_line, line, sizeof(ut.ut_line));
1836 ut.ut_type = USER_PROCESS;
1839 /* Insert the host name if one is supplied */
1842 strncpy (ut.ut_host, host, sizeof(ut.ut_host));
1845 /* Insert the IP address of the remote system if IP is enabled */
1846 if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr)
1848 memcpy (&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr,
1849 sizeof(ut.ut_addr));
1852 /* CL: Makes sure that the logout works */
1853 if (*host == 0 && *name==0)
1861 * Update the wtmp file.
1863 wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY);
1866 flock(wtmp, LOCK_EX);
1868 /* we really should check for error on the write for a full disk! */
1869 write (wtmp, (char *)&ut, sizeof(ut));
1872 flock(wtmp, LOCK_UN);
1876 /********************************************************************
1877 * Code for locking/unlocking the serial device.
1878 * This code is derived from chat.c.
1882 * lock - create a lock file for the named device
1885 int lock (char *dev)
1887 char hdb_lock_buffer[12];
1892 p = strrchr(dev, '/');
1898 lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1);
1899 if (lock_file == NULL)
1901 novm("lock file name");
1904 strcpy (lock_file, LOCK_PREFIX);
1905 strcat (lock_file, dev);
1907 * Attempt to create the lock file at this point.
1911 fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644);
1916 sprintf (hdb_lock_buffer, "%010d\n", pid);
1917 write (fd, hdb_lock_buffer, 11);
1919 write(fd, &pid, sizeof (pid));
1925 * If the file exists then check to see if the pid is stale
1927 if (errno == EEXIST)
1929 fd = open(lock_file, O_RDONLY, 0);
1932 if (errno == ENOENT) /* This is just a timing problem. */
1939 /* Read the lock file to find out who has the device locked */
1940 n = read (fd, hdb_lock_buffer, 11);
1944 syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
1948 /* See the process still exists. */
1952 hdb_lock_buffer[n] = '\0';
1953 sscanf (hdb_lock_buffer, " %d", &pid);
1955 pid = ((int *) hdb_lock_buffer)[0];
1957 if (pid == 0 || (kill(pid, 0) == -1 && errno == ESRCH))
1963 /* If the process does not exist then try to remove the lock */
1964 if (n == 0 && unlink (lock_file) == 0)
1966 syslog (LOG_NOTICE, "Removed stale lock on %s (pid %d)",
1971 syslog (LOG_NOTICE, "Device %s is locked by pid %d", dev, pid);
1975 syslog(LOG_ERR, "Can't create lock file %s: %m(%d)", lock_file, errno);
1985 /********************************************************************
1987 * unlock - remove our lockfile
2000 /********************************************************************
2002 * sifvjcomp - config tcp header compression
2005 int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
2007 u_int x = get_flags();
2011 if (ioctl (ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0)
2013 if (! ok_error (errno))
2015 syslog (LOG_ERR, "ioctl(PPPIOCSFLAGS): %m(%d)", errno);
2021 x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
2022 x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
2028 /********************************************************************
2030 * sifup - Config the interface up and enable IP packets to pass.
2037 memset (&ifr, '\0', sizeof (ifr));
2038 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2039 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0)
2041 if (! ok_error (errno))
2043 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m(%d)", errno);
2048 ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
2049 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0)
2051 if (! ok_error (errno))
2053 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m(%d)", errno);
2061 /********************************************************************
2063 * sifdown - Config the interface down and disable IP.
2072 memset (&ifr, '\0', sizeof (ifr));
2073 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2074 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0)
2076 if (! ok_error (errno))
2078 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m(%d)", errno);
2083 ifr.ifr_flags &= ~IFF_UP;
2084 ifr.ifr_flags |= IFF_POINTOPOINT;
2085 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0)
2087 if (! ok_error (errno))
2089 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m(%d)", errno);
2096 /********************************************************************
2098 * sifaddr - Config the interface IP addresses and netmask.
2101 int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr,
2107 memset (&ifr, '\0', sizeof (ifr));
2108 memset (&rt, '\0', sizeof (rt));
2110 SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
2111 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
2112 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
2114 strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2116 * Set our IP address
2118 ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = our_adr;
2119 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0)
2121 if (errno != EEXIST)
2123 if (! ok_error (errno))
2125 syslog (LOG_ERR, "ioctl(SIOCAIFADDR): %m(%d)", errno);
2130 syslog (LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists");
2135 * Set the gateway address
2137 ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = his_adr;
2138 if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0)
2140 if (! ok_error (errno))
2142 syslog (LOG_ERR, "ioctl(SIOCSIFDSTADDR): %m(%d)", errno);
2151 ((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = net_mask;
2152 if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0)
2154 if (! ok_error (errno))
2156 syslog (LOG_ERR, "ioctl(SIOCSIFNETMASK): %m(%d)", errno);
2162 * Add the device route
2164 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2165 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2166 rt.rt_dev = ifname; /* MJC */
2168 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0L;
2169 ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
2170 rt.rt_flags = RTF_UP | RTF_HOST;
2172 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0)
2174 if (! ok_error (errno))
2176 syslog (LOG_ERR, "ioctl(SIOCADDRT) device route: %m(%d)", errno);
2183 /********************************************************************
2185 * cifaddr - Clear the interface IP addresses, and delete routes
2186 * through the interface if possible.
2189 int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
2193 * Delete the route through the device
2195 memset (&rt, '\0', sizeof (rt));
2197 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2198 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2199 rt.rt_dev = ifname; /* MJC */
2201 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
2202 ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
2203 rt.rt_flags = RTF_UP | RTF_HOST;
2205 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH)
2207 if (still_ppp() && ! ok_error (errno))
2209 syslog (LOG_ERR, "ioctl(SIOCDELRT) device route: %m(%d)", errno);
2216 /********************************************************************
2218 * open_loopback - open the device we use for getting packets
2219 * in demand mode. Under Linux, we use our existing fd
2220 * to the ppp driver.
2223 open_ppp_loopback(void)
2226 struct termios tios;
2228 if (openpty (&master_fd, &slave_fd, loop_name, NULL, NULL) < 0)
2230 syslog(LOG_ERR, "No free pty for loopback");
2233 SYSDEBUG((LOG_DEBUG, "using %s for loopback", loop_name));
2235 set_ppp_fd(slave_fd);
2237 if (tcgetattr(ppp_fd, &tios) == 0)
2239 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
2240 tios.c_cflag |= CS8 | CREAD;
2241 tios.c_iflag = IGNPAR | CLOCAL;
2244 if (tcsetattr(ppp_fd, TCSAFLUSH, &tios) < 0)
2246 syslog(LOG_WARNING, "couldn't set attributes on loopback: %m(%d)", errno);
2250 flags = fcntl(master_fd, F_GETFL);
2252 fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2254 syslog(LOG_WARNING, "couldn't set master loopback to nonblock: %m(%d)", errno);
2257 flags = fcntl(ppp_fd, F_GETFL);
2259 fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2261 syslog(LOG_WARNING, "couldn't set slave loopback to nonblock: %m(%d)", errno);
2264 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
2266 syslog(LOG_ERR, "ioctl(TIOCSETD): %m(%d)", errno);
2270 * Find out which interface we were given.
2272 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
2274 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m(%d)", errno);
2278 * Enable debug in the driver if requested.
2280 set_kdebugflag (kdebugflag);
2283 /********************************************************************
2285 * restore_loop - reattach the ppp unit to the loopback.
2287 * The kernel ppp driver automatically reattaches the ppp unit to
2288 * the loopback if the serial port is set to a line discipline other
2289 * than ppp, or if it detects a modem hangup. The former will happen
2290 * in disestablish_ppp if the latter hasn't already happened, so we
2291 * shouldn't need to do anything.
2293 * Just to be sure, set the real serial port to the normal discipline.
2299 if (ppp_fd != slave_fd)
2301 (void) ioctl(ppp_fd, TIOCSETD, &tty_disc);
2302 set_ppp_fd(slave_fd);
2306 /********************************************************************
2308 * sifnpmode - Set the mode for handling packets for a given NP.
2312 sifnpmode(u, proto, mode)
2319 npi.protocol = proto;
2321 if (ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0)
2323 if (! ok_error (errno))
2325 syslog(LOG_ERR, "ioctl(PPPIOCSNPMODE, %d, %d): %m(%d)",
2326 proto, mode, errno);
2327 syslog(LOG_ERR, "ppp_fd=%d slave_fd=%d\n", ppp_fd, slave_fd);
2335 #include <linux/ipx.h>
2337 /********************************************************************
2339 * sipxfaddr - Config the interface IPX networknumber
2342 int sipxfaddr (int unit, unsigned long int network, unsigned char * node )
2346 struct sockaddr_ipx ipx_addr;
2348 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2351 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2354 if (! ok_error (errno))
2356 syslog (LOG_DEBUG, "socket(AF_IPX): %m(%d)", errno);
2362 memset (&ifr, '\0', sizeof (ifr));
2363 strcpy (ifr.ifr_name, ifname);
2365 memcpy (sipx->sipx_node, node, IPX_NODE_LEN);
2366 sipx->sipx_family = AF_IPX;
2367 sipx->sipx_port = 0;
2368 sipx->sipx_network = htonl (network);
2369 sipx->sipx_type = IPX_FRAME_ETHERII;
2370 sipx->sipx_action = IPX_CRTITF;
2372 * Set the IPX device
2374 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0)
2377 if (errno != EEXIST)
2379 if (! ok_error (errno))
2382 "ioctl(SIOCAIFADDR, CRTITF): %m(%d)", errno);
2387 syslog (LOG_WARNING,
2388 "ioctl(SIOCAIFADDR, CRTITF): Address already exists");
2397 /********************************************************************
2399 * cipxfaddr - Clear the information for the IPX network. The IPX routes
2400 * are removed and the device is no longer able to pass IPX
2404 int cipxfaddr (int unit)
2408 struct sockaddr_ipx ipx_addr;
2410 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2413 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2416 if (! ok_error (errno))
2418 syslog (LOG_DEBUG, "socket(AF_IPX): %m(%d)", errno);
2424 memset (&ifr, '\0', sizeof (ifr));
2425 strcpy (ifr.ifr_name, ifname);
2427 sipx->sipx_type = IPX_FRAME_ETHERII;
2428 sipx->sipx_action = IPX_DLTITF;
2429 sipx->sipx_family = AF_IPX;
2431 * Set the IPX device
2433 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0)
2435 if (! ok_error (errno))
2438 "ioctl(SIOCAIFADDR, IPX_DLTITF): %m(%d)", errno);
2448 /********************************************************************
2450 * sys_check_options - check the options that the user specified
2454 sys_check_options(void)
2457 struct stat stat_buf;
2459 * Disable the IPX protocol if the support is not present in the kernel.
2460 * If we disable it then ensure that IP support is enabled.
2462 while (ipxcp_protent.enabled_flag)
2464 if (path_to_procfs())
2466 strcat (route_buffer, "/net/ipx_interface");
2467 if (lstat (route_buffer, &stat_buf) >= 0)
2472 syslog (LOG_ERR, "IPX support is not present in the kernel\n");
2473 ipxcp_protent.enabled_flag = 0;
2474 ipcp_protent.enabled_flag = 1;