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>
28 #include <sys/utsname.h>
44 /* This is in netdevice.h. However, this compile will fail miserably if
45 you attempt to include netdevice.h because it has so many references
46 to __memcpy functions which it should not attempt to do. So, since I
47 really don't use it, but it must be defined, define it now. */
50 #define MAX_ADDR_LEN 7
54 #include <asm/types.h> /* glibc 2 conflicts with linux/types.h */
56 #include <net/if_arp.h>
57 #include <net/route.h>
58 #include <netinet/if_ether.h>
60 #include <linux/types.h>
62 #include <linux/if_arp.h>
63 #include <linux/route.h>
64 #include <linux/if_ether.h>
66 #include <netinet/in.h>
67 #include <arpa/inet.h>
69 #include <linux/ppp_defs.h>
70 #include <linux/if_ppp.h>
75 #include "patchlevel.h"
79 #if __GLIBC__ >= 2 && \
80 !(defined(__powerpc__) && __GLIBC__ == 2 && __GLIBC_MINOR__ == 0)
81 #include <netipx/ipx.h>
83 #include <linux/ipx.h>
85 #endif /* IPX_CHANGE */
88 #include <sys/locks.h>
91 #ifndef RTF_DEFAULT /* Normally in <linux/route.h> from <net/route.h> */
95 #define ok_error(num) ((num)==EIO)
97 static int tty_disc = N_TTY; /* The TTY discipline */
98 static int ppp_disc = N_PPP; /* The PPP discpline */
99 static int initfdflags = -1; /* Initial file descriptor flags for fd */
100 static int ppp_fd = -1; /* fd which is set to PPP discipline */
101 static int sock_fd = -1; /* socket for doing interface ioctls */
102 static int slave_fd = -1;
103 static int master_fd = -1;
105 static int has_proxy_arp = 0;
106 static int driver_version = 0;
107 static int driver_modification = 0;
108 static int driver_patch = 0;
109 static int driver_is_old = 0;
110 static int restore_term = 0; /* 1 => we've munged the terminal */
111 static struct termios inittermios; /* Initial TTY termios */
113 static char loop_name[20];
114 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
116 static int if_is_up; /* Interface has been marked up */
117 static u_int32_t default_route_gateway; /* Gateway for default route added */
118 static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
120 static char *lock_file;
122 static struct utsname utsname; /* for the kernel version */
123 static int kernel_version;
124 #define KVERSION(j,n,p) ((j)*1000000 + (n)*1000 + (p))
128 #define FLAGS_GOOD (IFF_UP | IFF_BROADCAST)
129 #define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \
130 IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP)
132 /* Prototypes for procedures local to this file. */
133 static int get_flags (void);
134 static void set_flags (int flags);
135 static int translate_speed (int bps);
136 static int baud_rate_of (int speed);
137 static char *path_to_route (void);
138 static void close_route_table (void);
139 static int open_route_table (void);
140 static int read_route_table (struct rtentry *rt);
141 static int defaultroute_exists (struct rtentry *rt);
142 static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr,
144 static void decode_version (char *buf, int *version, int *mod, int *patch);
146 extern u_char inpacket_buf[]; /* borrowed from main.c */
149 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
153 #define SET_SA_FAMILY(addr, family) \
154 memset ((char *) &(addr), '\0', sizeof(addr)); \
155 addr.sa_family = (family);
158 * Determine if the PPP connection should still be present.
164 #define LOCK_PREFIX "/var/lock/LCK.."
167 static void set_ppp_fd (int new_fd)
169 SYSDEBUG ((LOG_DEBUG, "setting ppp_fd to %d\n", new_fd));
173 static int still_ppp(void)
175 if (!hungup || ppp_fd == slave_fd)
178 set_ppp_fd(slave_fd);
184 /********************************************************************
186 * Functions to read and set the flags value in the device driver
189 static int get_flags (void)
193 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0)
195 if ( ok_error (errno) )
201 syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
206 SYSDEBUG ((LOG_DEBUG, "get flags = %x\n", flags));
210 /********************************************************************/
212 static void set_flags (int flags)
214 SYSDEBUG ((LOG_DEBUG, "set flags = %x\n", flags));
216 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
218 if (! ok_error (errno) )
220 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS, %x): %m(%d)", flags, errno);
226 /********************************************************************
228 * sys_init - System-dependent initialization.
233 int osmaj, osmin, ospatch;
235 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
236 setlogmask(LOG_UPTO(LOG_INFO));
239 setlogmask(LOG_UPTO(LOG_DEBUG));
242 /* Get an internet socket for doing socket ioctls. */
243 sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
246 if ( ! ok_error ( errno ))
248 syslog(LOG_ERR, "Couldn't create IP socket: %m(%d)", errno);
254 osmaj = osmin = ospatch = 0;
255 sscanf(utsname.release, "%d.%d.%d", &osmaj, &osmin, &ospatch);
256 kernel_version = KVERSION(osmaj, osmin, ospatch);
259 /********************************************************************
261 * sys_cleanup - restore any system state we modified before exiting:
262 * mark the interface down, delete default route and/or proxy arp entry.
263 * This should call die() because it's called from die().
266 void sys_cleanup(void)
269 * Take down the device
276 * Delete any routes through the device.
278 if (default_route_gateway != 0)
280 cifdefaultroute(0, 0, default_route_gateway);
285 cifproxyarp(0, proxy_arp_addr);
289 /********************************************************************
291 * sys_close - Clean up in a child process before execing.
301 /********************************************************************
303 * note_debug_level - note a change in the debug level.
306 void note_debug_level (void)
310 SYSDEBUG ((LOG_INFO, "Debug turned ON, Level %d", debug));
311 setlogmask(LOG_UPTO(LOG_DEBUG));
315 setlogmask(LOG_UPTO(LOG_WARNING));
319 /********************************************************************
321 * set_kdebugflag - Define the debugging level for the kernel
324 int set_kdebugflag (int requested_level)
326 if (ioctl(ppp_fd, PPPIOCSDEBUG, &requested_level) < 0)
328 if ( ! ok_error (errno) )
330 syslog (LOG_ERR, "ioctl(PPPIOCSDEBUG): %m");
334 SYSDEBUG ((LOG_INFO, "set kernel debugging level to %d",
339 /********************************************************************
341 * establish_ppp - Turn the serial port into a ppp interface.
344 void establish_ppp (int tty_fd)
348 * The current PPP device will be the tty file.
352 * Ensure that the tty device is in exclusive mode.
354 if (ioctl(tty_fd, TIOCEXCL, 0) < 0)
356 if ( ! ok_error ( errno ))
358 syslog (LOG_WARNING, "ioctl(TIOCEXCL): %m");
362 * Demand mode - prime the old ppp device to relinquish the unit.
364 if (demand && ioctl(slave_fd, PPPIOCXFERUNIT, 0) < 0)
366 syslog(LOG_ERR, "ioctl(transfer ppp unit): %m(%d)", errno);
370 * Set the current tty to the PPP discpline
372 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
374 if ( ! ok_error (errno) )
376 syslog(LOG_ERR, "ioctl(TIOCSETD): %m(%d)", errno);
381 * Find out which interface we were given.
383 if (ioctl(ppp_fd, PPPIOCGUNIT, &x) < 0)
385 if ( ! ok_error (errno))
387 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m(%d)", errno);
392 * Check that we got the same unit again.
398 syslog(LOG_ERR, "transfer_ppp failed: wanted unit %d, got %d",
406 * Enable debug in the driver if requested.
409 set_kdebugflag (kdebugflag);
411 set_flags (get_flags() & ~(SC_RCV_B7_0 | SC_RCV_B7_1 |
412 SC_RCV_EVNP | SC_RCV_ODDP));
414 SYSDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver",
415 driver_version, driver_modification, driver_patch));
417 * Fetch the initial file flags and reset blocking mode on the file.
419 initfdflags = fcntl(ppp_fd, F_GETFL);
421 if (initfdflags == -1 ||
422 fcntl(ppp_fd, F_SETFL, initfdflags | O_NONBLOCK) == -1)
424 if ( ! ok_error (errno))
427 "Couldn't set device to non-blocking mode: %m");
432 /********************************************************************
434 * disestablish_ppp - Restore the serial port to normal operation.
435 * This shouldn't call die() because it's called from die().
438 void disestablish_ppp(int tty_fd)
441 * Attempt to restore the previous tty settings
446 * Restore the previous line discipline
448 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0)
450 if ( ! ok_error (errno))
452 syslog(LOG_ERR, "ioctl(TIOCSETD, N_TTY): %m");
456 if (ioctl(tty_fd, TIOCNXCL, 0) < 0)
458 if ( ! ok_error (errno))
460 syslog (LOG_WARNING, "ioctl(TIOCNXCL): %m(%d)", errno);
464 /* Reset non-blocking mode on fd. */
465 if (initfdflags != -1 && fcntl(tty_fd, F_SETFL, initfdflags) < 0)
467 if ( ! ok_error (errno))
470 "Couldn't restore device fd flags: %m");
477 /********************************************************************
479 * clean_check - Fetch the flags for the device and generate
480 * appropriate error messages.
482 void clean_check(void)
489 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0)
492 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP))
495 case SC_RCV_B7_0 | SC_RCV_EVNP:
496 case SC_RCV_B7_0 | SC_RCV_ODDP:
497 case SC_RCV_B7_0 | SC_RCV_ODDP | SC_RCV_EVNP:
498 s = "all had bit 7 set to 1";
502 case SC_RCV_B7_1 | SC_RCV_EVNP:
503 case SC_RCV_B7_1 | SC_RCV_ODDP:
504 case SC_RCV_B7_1 | SC_RCV_ODDP | SC_RCV_EVNP:
505 s = "all had bit 7 set to 0";
509 s = "all had odd parity";
513 s = "all had even parity";
519 syslog(LOG_WARNING, "Receive serial link is not"
521 syslog(LOG_WARNING, "Problem: %s", s);
529 * List of valid speeds.
533 int speed_int, speed_val;
610 /********************************************************************
612 * Translate from bits/second to a speed_t.
615 static int translate_speed (int bps)
617 struct speed *speedp;
621 for (speedp = speeds; speedp->speed_int; speedp++)
623 if (bps == speedp->speed_int)
625 return speedp->speed_val;
628 syslog(LOG_WARNING, "speed %d not supported", bps);
633 /********************************************************************
635 * Translate from a speed_t to bits/second.
638 static int baud_rate_of (int speed)
640 struct speed *speedp;
644 for (speedp = speeds; speedp->speed_int; speedp++)
646 if (speed == speedp->speed_val)
648 return speedp->speed_int;
655 /********************************************************************
657 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
658 * at the requested speed, etc. If `local' is true, set CLOCAL
659 * regardless of whether the modem option was specified.
662 void set_up_tty(int tty_fd, int local)
668 if (tcgetattr(tty_fd, &tios) < 0)
670 syslog(LOG_ERR, "tcgetattr: %m(%d)", errno);
679 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
680 tios.c_cflag |= CS8 | CREAD | HUPCL;
682 tios.c_iflag = IGNBRK | IGNPAR;
686 tios.c_cc[VTIME] = 0;
690 tios.c_cflag ^= (CLOCAL | HUPCL);
696 tios.c_cflag |= CRTSCTS;
700 tios.c_iflag |= IXON | IXOFF;
701 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
702 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
706 tios.c_cflag &= ~CRTSCTS;
713 speed = translate_speed(inspeed);
716 cfsetospeed (&tios, speed);
717 cfsetispeed (&tios, speed);
720 * We can't proceed if the serial port speed is B0,
721 * since that implies that the serial port is disabled.
725 speed = cfgetospeed(&tios);
728 syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
734 if (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0)
736 syslog(LOG_ERR, "tcsetattr: %m");
740 baud_rate = baud_rate_of(speed);
744 /********************************************************************
746 * setdtr - control the DTR line on the serial port.
747 * This is called from die(), so it shouldn't call die().
750 void setdtr (int tty_fd, int on)
752 int modembits = TIOCM_DTR;
754 ioctl(tty_fd, (on ? TIOCMBIS : TIOCMBIC), &modembits);
757 /********************************************************************
759 * restore_tty - restore the terminal to the saved settings.
762 void restore_tty (int tty_fd)
768 * Turn off echoing, because otherwise we can get into
769 * a loop with the tty and the modem echoing to each other.
770 * We presume we are the sole user of this tty device, so
771 * when we close it, it will revert to its defaults anyway.
775 inittermios.c_lflag &= ~(ECHO | ECHONL);
778 if (tcsetattr(tty_fd, TCSAFLUSH, &inittermios) < 0)
780 if (! ok_error (errno))
782 syslog(LOG_WARNING, "tcsetattr: %m");
788 /********************************************************************
790 * output - Output PPP packet.
793 void output (int unit, unsigned char *p, int len)
797 log_packet(p, len, "sent ", LOG_DEBUG);
800 if (write(ppp_fd, p, len) < 0)
802 if (errno == EWOULDBLOCK || errno == ENOBUFS
803 || errno == ENXIO || errno == EIO || errno == EINTR)
805 syslog(LOG_WARNING, "write: warning: %m (%d)", errno);
809 syslog(LOG_ERR, "write: %m (%d)", errno);
814 /********************************************************************
816 * wait_input - wait until there is data available on ppp_fd,
817 * for the length of time specified by *timo (indefinite
821 void wait_input (struct timeval *timo)
827 FD_SET(ppp_fd, &ready);
829 n = select(ppp_fd + 1, &ready, NULL, &ready, timo);
830 if (n < 0 && errno != EINTR)
832 syslog(LOG_ERR, "select: %m(%d)", errno);
837 /********************************************************************
839 * wait_loop_output - wait until there is data available on the
840 * loopback, for the length of time specified by *timo (indefinite
843 void wait_loop_output(timo)
844 struct timeval *timo;
850 FD_SET(master_fd, &ready);
851 n = select(master_fd + 1, &ready, NULL, &ready, timo);
852 if (n < 0 && errno != EINTR)
854 syslog(LOG_ERR, "select: %m(%d)", errno);
859 /********************************************************************
861 * wait_time - wait for a given length of time or until a
862 * signal is received.
866 struct timeval *timo;
870 n = select(0, NULL, NULL, NULL, timo);
871 if (n < 0 && errno != EINTR) {
872 syslog(LOG_ERR, "select: %m(%d)", errno);
877 /********************************************************************
879 * read_packet - get a PPP packet from the serial device.
882 int read_packet (unsigned char *buf)
886 len = read(ppp_fd, buf, PPP_MTU + PPP_HDRLEN);
889 if (errno == EWOULDBLOCK)
893 syslog(LOG_ERR, "read: %m(%d)", errno);
899 /********************************************************************
901 * get_loop_output - get outgoing packets from the ppp device,
902 * and detect when we want to bring the real link up.
903 * Return value is 1 if we need to bring up the link, 0 otherwise.
906 get_loop_output(void)
909 int n = read(master_fd, inbuf, sizeof(inbuf));
913 if (loop_chars(inbuf, n))
917 n = read(master_fd, inbuf, sizeof(inbuf));
922 syslog(LOG_ERR, "eof on loopback");
926 if (errno != EWOULDBLOCK)
928 syslog(LOG_ERR, "read from loopback: %m(%d)", errno);
935 /********************************************************************
937 * ppp_send_config - configure the transmit characteristics of
941 void ppp_send_config (int unit,int mtu,u_int32_t asyncmap,int pcomp,int accomp)
946 SYSDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu));
948 * Ensure that the link is still up.
953 * Set the MTU and other parameters for the ppp device
955 memset (&ifr, '\0', sizeof (ifr));
956 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
959 if (ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
961 syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m(%d)", errno);
965 SYSDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
966 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0)
968 syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m(%d)", errno);
973 x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
974 x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
979 /********************************************************************
981 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
984 void ppp_set_xaccm (int unit, ext_accm accm)
986 SYSDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
987 accm[0], accm[1], accm[2], accm[3]));
989 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
991 if ( ! ok_error (errno))
993 syslog(LOG_WARNING, "ioctl(set extended ACCM): %m(%d)", errno);
998 /********************************************************************
1000 * ppp_recv_config - configure the receive-side characteristics of
1001 * the ppp interface.
1004 void ppp_recv_config (int unit,int mru,u_int32_t asyncmap,int pcomp,int accomp)
1008 SYSDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
1010 * If we were called because the link has gone down then there is nothing
1011 * which may be done. Just return without incident.
1018 * Set the receiver parameters
1020 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
1022 if ( ! ok_error (errno))
1024 syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m(%d)", errno);
1028 SYSDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
1029 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0)
1031 syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m(%d)", errno);
1036 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
1040 /********************************************************************
1042 * ccp_test - ask kernel whether a given compression method
1043 * is acceptable for use.
1046 int ccp_test (int unit, u_char *opt_ptr, int opt_len, int for_transmit)
1048 struct ppp_option_data data;
1050 memset (&data, '\0', sizeof (data));
1052 data.length = opt_len;
1053 data.transmit = for_transmit;
1055 if (ioctl(ppp_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
1060 return (errno == ENOBUFS)? 0: -1;
1063 /********************************************************************
1065 * ccp_flags_set - inform kernel about the current state of CCP.
1068 void ccp_flags_set (int unit, int isopen, int isup)
1072 int x = get_flags();
1073 x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN;
1074 x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP;
1079 /********************************************************************
1081 * get_idle_time - return how long the link has been idle.
1084 get_idle_time(u, ip)
1086 struct ppp_idle *ip;
1088 return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
1091 /********************************************************************
1093 * ccp_fatal_error - returns 1 if decompression was disabled as a
1094 * result of an error detected after decompression of a packet,
1095 * 0 otherwise. This is necessary because of patent nonsense.
1098 int ccp_fatal_error (int unit)
1100 int x = get_flags();
1102 return x & SC_DC_FERROR;
1106 * path_to_route - determine the path to the proc file system data
1108 #define ROUTE_MAX_COLS 12
1109 FILE *route_fd = (FILE *) 0;
1110 static char route_buffer [512];
1111 static int route_dev_col, route_dest_col, route_gw_col;
1112 static int route_flags_col, route_mask_col;
1113 static int route_num_cols;
1115 static char *path_to_route (void);
1116 static int open_route_table (void);
1117 static void close_route_table (void);
1118 static int read_route_table (struct rtentry *rt);
1120 /********************************************************************
1122 * path_to_procfs - find the path to the proc file system mount point
1125 static int path_to_procfs (void)
1127 struct mntent *mntent;
1130 fp = fopen(MOUNTED, "r");
1132 /* Default the mount location of /proc */
1133 strncpy (route_buffer, "/proc", sizeof (route_buffer)-10);
1137 while ((mntent = getmntent(fp)) != NULL) {
1138 if (strcmp(mntent->mnt_type, MNTTYPE_IGNORE) == 0)
1140 if (strcmp(mntent->mnt_type, "proc") == 0)
1147 strncpy(route_buffer, mntent->mnt_dir, sizeof (route_buffer)-10);
1148 route_buffer [sizeof (route_buffer)-10] = '\0';
1152 /********************************************************************
1154 * path_to_route - find the path to the route tables in the proc file system
1157 static char *path_to_route (void)
1159 if (!path_to_procfs()) {
1160 syslog (LOG_ERR, "proc file system not mounted");
1163 strcat (route_buffer, "/net/route");
1164 return (route_buffer);
1167 /********************************************************************
1169 * close_route_table - close the interface to the route table
1172 static void close_route_table (void)
1174 if (route_fd != (FILE *) 0) {
1176 route_fd = (FILE *) 0;
1180 /********************************************************************
1182 * open_route_table - open the interface to the route table
1184 static char route_delims[] = " \t\n";
1186 static int open_route_table (void)
1190 close_route_table();
1192 path = path_to_route();
1196 route_fd = fopen (path, "r");
1197 if (route_fd == NULL) {
1198 syslog (LOG_ERR, "can't open %s: %m (%d)", path, errno);
1202 route_dev_col = 0; /* default to usual columns */
1205 route_flags_col = 3;
1209 /* parse header line */
1210 if (fgets(route_buffer, sizeof(route_buffer), route_fd) != 0) {
1211 char *p = route_buffer, *q;
1213 for (col = 0; col < ROUTE_MAX_COLS; ++col) {
1215 if ((q = strtok(p, route_delims)) == 0)
1217 if (strcasecmp(q, "iface") == 0)
1218 route_dev_col = col;
1219 else if (strcasecmp(q, "destination") == 0)
1220 route_dest_col = col;
1221 else if (strcasecmp(q, "gateway") == 0)
1223 else if (strcasecmp(q, "flags") == 0)
1224 route_flags_col = col;
1225 else if (strcasecmp(q, "mask") == 0)
1226 route_mask_col = col;
1229 if (used && col >= route_num_cols)
1230 route_num_cols = col + 1;
1238 /********************************************************************
1240 * read_route_table - read the next entry from the route table
1243 static int read_route_table(struct rtentry *rt)
1245 char *cols[ROUTE_MAX_COLS], *p;
1248 memset (rt, '\0', sizeof (struct rtentry));
1250 if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
1254 for (col = 0; col < route_num_cols; ++col) {
1255 cols[col] = strtok(p, route_delims);
1256 if (cols[col] == NULL)
1257 return 0; /* didn't get enough columns */
1260 ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr =
1261 strtoul(cols[route_dest_col], NULL, 16);
1263 ((struct sockaddr_in *) &rt->rt_gateway)->sin_addr.s_addr =
1264 strtoul(cols[route_gw_col], NULL, 16);
1266 ((struct sockaddr_in *) &rt->rt_genmask)->sin_addr.s_addr =
1267 strtoul(cols[route_mask_col], NULL, 16);
1269 rt->rt_flags = (short) strtoul(cols[route_flags_col], NULL, 16);
1270 rt->rt_dev = cols[route_dev_col];
1275 /********************************************************************
1277 * defaultroute_exists - determine if there is a default route
1280 static int defaultroute_exists (struct rtentry *rt)
1284 if (!open_route_table())
1287 while (read_route_table(rt) != 0) {
1288 if ((rt->rt_flags & RTF_UP) == 0)
1291 if (((struct sockaddr_in *) (&rt->rt_dst))->sin_addr.s_addr == 0L) {
1297 close_route_table();
1302 * have_route_to - determine if the system has any route to
1303 * a given IP address. `addr' is in network byte order.
1304 * Return value is 1 if yes, 0 if no, -1 if don't know.
1305 * For demand mode to work properly, we have to ignore routes
1306 * through our own interface.
1308 int have_route_to(u_int32_t addr)
1313 if (!open_route_table())
1314 return -1; /* don't know */
1316 while (read_route_table(&rt)) {
1317 if ((rt.rt_flags & RTF_UP) == 0 || strcmp(rt.rt_dev, ifname) == 0)
1319 if ((addr & ((struct sockaddr_in *)&rt.rt_genmask)->sin_addr.s_addr)
1320 == ((struct sockaddr_in *)&rt.rt_dst)->sin_addr.s_addr) {
1326 close_route_table();
1330 /********************************************************************
1332 * sifdefaultroute - assign a default route through the address given.
1335 int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1339 if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0)
1341 struct in_addr old_gateway =
1342 ((struct sockaddr_in *) (&rt.rt_gateway))-> sin_addr;
1344 if (old_gateway.s_addr != gateway)
1347 "not replacing existing default route to %s [%s]",
1348 rt.rt_dev, inet_ntoa (old_gateway));
1353 memset (&rt, '\0', sizeof (rt));
1354 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1355 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1357 if (kernel_version > KVERSION(2,1,0)) {
1358 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1359 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = 0L;
1362 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
1364 rt.rt_flags = RTF_UP | RTF_GATEWAY | RTF_DEFAULT;
1365 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0)
1367 if ( ! ok_error ( errno ))
1369 syslog (LOG_ERR, "default route ioctl(SIOCADDRT): %m(%d)", errno);
1374 default_route_gateway = gateway;
1378 /********************************************************************
1380 * cifdefaultroute - delete a default route through the address given.
1383 int cifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1387 default_route_gateway = 0;
1389 memset (&rt, '\0', sizeof (rt));
1390 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1391 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1393 if (kernel_version > KVERSION(2,1,0)) {
1394 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1395 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = 0L;
1398 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
1400 rt.rt_flags = RTF_UP | RTF_GATEWAY | RTF_DEFAULT;
1401 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH)
1405 if ( ! ok_error ( errno ))
1408 "default route ioctl(SIOCDELRT): %m(%d)", errno);
1417 /********************************************************************
1419 * sifproxyarp - Make a proxy ARP entry for the peer.
1422 int sifproxyarp (int unit, u_int32_t his_adr)
1424 struct arpreq arpreq;
1426 if (has_proxy_arp == 0)
1428 memset (&arpreq, '\0', sizeof(arpreq));
1430 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1431 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
1432 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1434 * Get the hardware address of an interface on the same subnet
1435 * as our local address.
1437 if (!get_ether_addr(his_adr, &arpreq.arp_ha, arpreq.arp_dev))
1439 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
1443 if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0)
1445 if ( ! ok_error ( errno ))
1447 syslog(LOG_ERR, "ioctl(SIOCSARP): %m(%d)", errno);
1453 proxy_arp_addr = his_adr;
1458 /********************************************************************
1460 * cifproxyarp - Delete the proxy ARP entry for the peer.
1463 int cifproxyarp (int unit, u_int32_t his_adr)
1465 struct arpreq arpreq;
1467 if (has_proxy_arp == 1)
1469 memset (&arpreq, '\0', sizeof(arpreq));
1470 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1471 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
1472 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1474 if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0)
1476 if ( ! ok_error ( errno ))
1478 syslog(LOG_WARNING, "ioctl(SIOCDARP): %m(%d)", errno);
1487 /********************************************************************
1489 * get_ether_addr - get the hardware address of an interface on the
1490 * the same subnet as ipaddr.
1493 static int get_ether_addr (u_int32_t ipaddr,
1494 struct sockaddr *hwaddr,
1497 struct ifreq *ifr, *ifend;
1498 u_int32_t ina, mask;
1501 struct ifreq ifs[MAX_IFS];
1503 ifc.ifc_len = sizeof(ifs);
1505 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0)
1507 if ( ! ok_error ( errno ))
1509 syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m(%d)", errno);
1514 SYSDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s",
1515 ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr)));
1517 * Scan through looking for an interface with an Internet
1518 * address on the same subnet as `ipaddr'.
1520 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
1521 for (ifr = ifc.ifc_req; ifr < ifend; ifr++)
1523 if (ifr->ifr_addr.sa_family == AF_INET)
1525 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1526 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1527 SYSDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s",
1530 * Check that the interface is up, and not point-to-point
1533 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1538 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1543 * Get its netmask and check that it's on the right subnet.
1545 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1550 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1551 SYSDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx",
1552 ip_ntoa(ina), ntohl(mask)));
1554 if (((ipaddr ^ ina) & mask) != 0)
1567 memcpy (name, ifreq.ifr_name, sizeof(ifreq.ifr_name));
1568 syslog(LOG_INFO, "found interface %s for proxy arp", name);
1570 * Now get the hardware address.
1572 memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
1573 if (ioctl (sock_fd, SIOCGIFHWADDR, &ifreq) < 0)
1575 syslog(LOG_ERR, "SIOCGIFHWADDR(%s): %m(%d)", ifreq.ifr_name, errno);
1581 sizeof (struct sockaddr));
1583 SYSDEBUG ((LOG_DEBUG,
1584 "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
1585 (int) ((unsigned char *) &hwaddr->sa_data)[0],
1586 (int) ((unsigned char *) &hwaddr->sa_data)[1],
1587 (int) ((unsigned char *) &hwaddr->sa_data)[2],
1588 (int) ((unsigned char *) &hwaddr->sa_data)[3],
1589 (int) ((unsigned char *) &hwaddr->sa_data)[4],
1590 (int) ((unsigned char *) &hwaddr->sa_data)[5],
1591 (int) ((unsigned char *) &hwaddr->sa_data)[6],
1592 (int) ((unsigned char *) &hwaddr->sa_data)[7]));
1596 /********************************************************************
1598 * Return user specified netmask, modified by any mask we might determine
1599 * for address `addr' (in network byte order).
1600 * Here we scan through the system's list of interfaces, looking for
1601 * any non-point-to-point interfaces which might appear to be on the same
1602 * network as `addr'. If we find any, we OR in their netmask to the
1603 * user-specified netmask.
1606 u_int32_t GetMask (u_int32_t addr)
1608 u_int32_t mask, nmask, ina;
1609 struct ifreq *ifr, *ifend, ifreq;
1611 struct ifreq ifs[MAX_IFS];
1615 if (IN_CLASSA(addr)) /* determine network mask for address class */
1617 nmask = IN_CLASSA_NET;
1621 if (IN_CLASSB(addr))
1623 nmask = IN_CLASSB_NET;
1627 nmask = IN_CLASSC_NET;
1631 /* class D nets are disallowed by bad_ip_adrs */
1632 mask = netmask | htonl(nmask);
1634 * Scan through the system's network interfaces.
1636 ifc.ifc_len = sizeof(ifs);
1638 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0)
1640 if ( ! ok_error ( errno ))
1642 syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m(%d)", errno);
1647 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1648 for (ifr = ifc.ifc_req; ifr < ifend; ifr++)
1651 * Check the interface's internet address.
1653 if (ifr->ifr_addr.sa_family != AF_INET)
1657 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1658 if (((ntohl(ina) ^ addr) & nmask) != 0)
1663 * Check that the interface is up, and not point-to-point nor loopback.
1665 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1666 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1671 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1676 * Get its netmask and OR it into our mask.
1678 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1682 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1688 /********************************************************************
1690 * Internal routine to decode the version.modification.patch level
1693 static void decode_version (char *buf, int *version,
1694 int *modification, int *patch)
1696 *version = (int) strtoul (buf, &buf, 10);
1703 *modification = (int) strtoul (buf, &buf, 10);
1707 *patch = (int) strtoul (buf, &buf, 10);
1719 /********************************************************************
1721 * Procedure to determine if the PPP line discipline is registered.
1725 ppp_registered(void)
1731 local_fd = open(devnam, O_NONBLOCK | O_RDWR, 0);
1734 syslog(LOG_ERR, "Failed to open %s: %m(%d)", devnam, errno);
1738 initfdflags = fcntl(local_fd, F_GETFL);
1739 if (initfdflags == -1)
1741 syslog(LOG_ERR, "Couldn't get device fd flags: %m(%d)", errno);
1746 initfdflags &= ~O_NONBLOCK;
1747 fcntl(local_fd, F_SETFL, initfdflags);
1749 * Read the initial line dicipline and try to put the device into the
1752 if (ioctl(local_fd, TIOCGETD, &init_disc) < 0)
1754 syslog(LOG_ERR, "ioctl(TIOCGETD): %m(%d)", errno);
1759 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0)
1761 syslog(LOG_ERR, "ioctl(TIOCSETD): %m(%d)", errno);
1766 if (ioctl(local_fd, TIOCSETD, &init_disc) < 0)
1768 syslog(LOG_ERR, "ioctl(TIOCSETD): %m(%d)", errno);
1777 /********************************************************************
1779 * ppp_available - check whether the system has any ppp interfaces
1780 * (in fact we check whether we can do an ioctl on ppp0).
1783 int ppp_available(void)
1788 int my_version, my_modification, my_patch;
1789 extern char *no_ppp_msg;
1791 * Open a socket for doing the ioctl operations.
1793 s = socket(AF_INET, SOCK_DGRAM, 0);
1799 strncpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1800 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1802 * If the device did not exist then attempt to create one by putting the
1803 * current tty into the PPP discipline. If this works then obtain the
1804 * flags for the device again.
1808 if (ppp_registered())
1810 strncpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1811 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1815 * Ensure that the hardware address is for PPP and not something else
1819 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
1822 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
1830 "This system lacks kernel support for PPP. This could be because\n"
1831 "the PPP kernel module is not loaded, or because the kernel is\n"
1832 "not configured for PPP. See the README.linux file in the\n"
1833 "ppp-2.3.6 distribution.\n";
1836 * This is the PPP device. Validate the version of the driver at this
1837 * point to ensure that this program will work with the driver.
1841 char abBuffer [1024];
1843 ifr.ifr_data = abBuffer;
1844 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
1846 syslog(LOG_ERR, "Couldn't read driver version: %m");
1848 no_ppp_msg = "Sorry, couldn't verify kernel driver version\n";
1851 decode_version(abBuffer,
1853 &driver_modification,
1856 * Validate the version of the driver against the version that we used.
1858 decode_version(VERSION,
1863 /* The version numbers must match */
1864 if (driver_version != my_version)
1869 /* The modification levels must be legal */
1870 if (driver_modification < 3)
1872 if (driver_modification >= 2) {
1873 /* we can cope with 2.2.0 and above */
1883 sprintf (route_buffer,
1884 "Sorry - PPP driver version %d.%d.%d is out of date\n",
1885 driver_version, driver_modification, driver_patch);
1887 no_ppp_msg = route_buffer;
1894 /********************************************************************
1896 * Update the wtmp file with the appropriate user name and tty device.
1899 void logwtmp (const char *line, const char *name, const char *host)
1902 struct utmp ut, *utp;
1903 pid_t mypid = getpid();
1905 * Update the signon database for users.
1906 * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996
1908 utmpname(_PATH_UTMP);
1910 while ((utp = getutent()) && (utp->ut_pid != mypid))
1913 /* Is this call really necessary? There is another one after the 'put' */
1918 memcpy(&ut, utp, sizeof(ut));
1922 /* some gettys/telnetds don't initialize utmp... */
1923 memset(&ut, 0, sizeof(ut));
1926 if (ut.ut_id[0] == 0)
1928 strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
1931 strncpy(ut.ut_user, name, sizeof(ut.ut_user));
1932 strncpy(ut.ut_line, line, sizeof(ut.ut_line));
1936 ut.ut_type = USER_PROCESS;
1939 /* Insert the host name if one is supplied */
1942 strncpy (ut.ut_host, host, sizeof(ut.ut_host));
1945 /* Insert the IP address of the remote system if IP is enabled */
1946 if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr)
1948 memcpy (&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr,
1949 sizeof(ut.ut_addr));
1952 /* CL: Makes sure that the logout works */
1953 if (*host == 0 && *name==0)
1961 * Update the wtmp file.
1963 wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY);
1966 flock(wtmp, LOCK_EX);
1968 /* we really should check for error on the write for a full disk! */
1969 write (wtmp, (char *)&ut, sizeof(ut));
1972 flock(wtmp, LOCK_UN);
1976 /********************************************************************
1977 * Code for locking/unlocking the serial device.
1978 * This code is derived from chat.c.
1982 * lock - create a lock file for the named device
1985 int lock (char *dev)
1989 lock_file = malloc(strlen(dev) + 1);
1990 if (lock_file == NULL)
1992 novm("lock file name");
1994 strcpy (lock_file, dev);
1995 result = mklock (dev, (void *) 0);
1999 syslog (LOG_NOTICE, "Device %s is locked by pid %d", dev, result);
2008 syslog (LOG_ERR, "Can't create lock file %s", lock_file);
2016 char hdb_lock_buffer[12];
2021 p = strrchr(dev, '/');
2027 lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1);
2028 if (lock_file == NULL)
2030 novm("lock file name");
2033 strcpy (lock_file, LOCK_PREFIX);
2034 strcat (lock_file, dev);
2036 * Attempt to create the lock file at this point.
2040 fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644);
2045 sprintf (hdb_lock_buffer, "%010d\n", pid);
2046 write (fd, hdb_lock_buffer, 11);
2048 write(fd, &pid, sizeof (pid));
2054 * If the file exists then check to see if the pid is stale
2056 if (errno == EEXIST)
2058 fd = open(lock_file, O_RDONLY, 0);
2061 if (errno == ENOENT) /* This is just a timing problem. */
2068 /* Read the lock file to find out who has the device locked */
2069 n = read (fd, hdb_lock_buffer, 11);
2073 syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
2077 /* See the process still exists. */
2081 hdb_lock_buffer[n] = '\0';
2082 sscanf (hdb_lock_buffer, " %d", &pid);
2084 pid = ((int *) hdb_lock_buffer)[0];
2086 if (pid == 0 || pid == getpid()
2087 || (kill(pid, 0) == -1 && errno == ESRCH))
2093 /* If the process does not exist then try to remove the lock */
2094 if (n == 0 && unlink (lock_file) == 0)
2096 syslog (LOG_NOTICE, "Removed stale lock on %s (pid %d)",
2101 syslog (LOG_NOTICE, "Device %s is locked by pid %d", dev, pid);
2105 syslog(LOG_ERR, "Can't create lock file %s: %m(%d)", lock_file, errno);
2116 /********************************************************************
2118 * unlock - remove our lockfile
2126 (void) rmlock (lock_file, (void *) 0);
2135 /********************************************************************
2137 * sifvjcomp - config tcp header compression
2140 int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
2142 u_int x = get_flags();
2146 if (ioctl (ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0)
2148 if (! ok_error (errno))
2150 syslog (LOG_ERR, "ioctl(PPPIOCSMAXCID): %m(%d)", errno);
2156 x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
2157 x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
2163 /********************************************************************
2165 * sifup - Config the interface up and enable IP packets to pass.
2172 memset (&ifr, '\0', sizeof (ifr));
2173 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2174 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0)
2176 if (! ok_error (errno))
2178 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m(%d)", errno);
2183 ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
2184 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0)
2186 if (! ok_error (errno))
2188 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m(%d)", errno);
2196 /********************************************************************
2198 * sifdown - Config the interface down and disable IP.
2207 memset (&ifr, '\0', sizeof (ifr));
2208 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2209 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0)
2211 if (! ok_error (errno))
2213 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m(%d)", errno);
2218 ifr.ifr_flags &= ~IFF_UP;
2219 ifr.ifr_flags |= IFF_POINTOPOINT;
2220 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0)
2222 if (! ok_error (errno))
2224 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m(%d)", errno);
2231 /********************************************************************
2233 * sifaddr - Config the interface IP addresses and netmask.
2236 int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr,
2242 memset (&ifr, '\0', sizeof (ifr));
2243 memset (&rt, '\0', sizeof (rt));
2245 SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
2246 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
2247 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
2249 strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2251 * Set our IP address
2253 ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = our_adr;
2254 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0)
2256 if (errno != EEXIST)
2258 if (! ok_error (errno))
2260 syslog (LOG_ERR, "ioctl(SIOCAIFADDR): %m(%d)", errno);
2265 syslog (LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists");
2270 * Set the gateway address
2272 ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = his_adr;
2273 if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0)
2275 if (! ok_error (errno))
2277 syslog (LOG_ERR, "ioctl(SIOCSIFDSTADDR): %m(%d)", errno);
2283 * For recent kernels, force the netmask to 255.255.255.255.
2285 if (kernel_version >= KVERSION(2,1,16))
2289 ((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = net_mask;
2290 if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0)
2292 if (! ok_error (errno))
2294 syslog (LOG_ERR, "ioctl(SIOCSIFNETMASK): %m(%d)", errno);
2300 * Add the device route
2302 if (kernel_version < KVERSION(2,1,16)) {
2303 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2304 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2307 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0L;
2308 ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
2309 rt.rt_flags = RTF_UP | RTF_HOST;
2311 if (kernel_version > KVERSION(2,1,0)) {
2312 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2313 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = -1L;
2316 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0)
2318 if (! ok_error (errno))
2320 syslog (LOG_ERR, "ioctl(SIOCADDRT) device route: %m(%d)", errno);
2328 /********************************************************************
2330 * cifaddr - Clear the interface IP addresses, and delete routes
2331 * through the interface if possible.
2334 int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
2338 if (kernel_version < KVERSION(2,1,16)) {
2340 * Delete the route through the device
2342 memset (&rt, '\0', sizeof (rt));
2344 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2345 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2348 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
2349 ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
2350 rt.rt_flags = RTF_UP | RTF_HOST;
2352 if (kernel_version > KVERSION(2,1,0)) {
2353 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2354 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = -1L;
2357 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH)
2359 if (still_ppp() && ! ok_error (errno))
2361 syslog (LOG_ERR, "ioctl(SIOCDELRT) device route: %m(%d)", errno);
2369 /********************************************************************
2371 * open_loopback - open the device we use for getting packets
2372 * in demand mode. Under Linux, we use our existing fd
2373 * to the ppp driver.
2376 open_ppp_loopback(void)
2379 struct termios tios;
2382 for (i = 0; i < 64; ++i) {
2383 sprintf(loop_name, "/dev/pty%c%x", 'p' + i / 16, i % 16);
2384 master_fd = open(loop_name, O_RDWR | O_NOCTTY, 0);
2388 if (master_fd < 0) {
2389 syslog(LOG_ERR, "No free pty for loopback");
2392 SYSDEBUG((LOG_DEBUG, "using %s for loopback", loop_name));
2394 slave_fd = open(loop_name, O_RDWR | O_NOCTTY, 0);
2396 syslog(LOG_ERR, "Couldn't open %s for loopback: %m", loop_name);
2400 set_ppp_fd(slave_fd);
2402 if (tcgetattr(ppp_fd, &tios) == 0)
2404 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
2405 tios.c_cflag |= CS8 | CREAD;
2406 tios.c_iflag = IGNPAR | CLOCAL;
2409 if (tcsetattr(ppp_fd, TCSAFLUSH, &tios) < 0)
2411 syslog(LOG_WARNING, "couldn't set attributes on loopback: %m(%d)", errno);
2415 flags = fcntl(master_fd, F_GETFL);
2417 fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2419 syslog(LOG_WARNING, "couldn't set master loopback to nonblock: %m(%d)", errno);
2422 flags = fcntl(ppp_fd, F_GETFL);
2424 fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2426 syslog(LOG_WARNING, "couldn't set slave loopback to nonblock: %m(%d)", errno);
2429 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
2431 syslog(LOG_ERR, "ioctl(TIOCSETD): %m(%d)", errno);
2435 * Find out which interface we were given.
2437 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
2439 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m(%d)", errno);
2443 * Enable debug in the driver if requested.
2445 set_kdebugflag (kdebugflag);
2448 /********************************************************************
2450 * restore_loop - reattach the ppp unit to the loopback.
2452 * The kernel ppp driver automatically reattaches the ppp unit to
2453 * the loopback if the serial port is set to a line discipline other
2454 * than ppp, or if it detects a modem hangup. The former will happen
2455 * in disestablish_ppp if the latter hasn't already happened, so we
2456 * shouldn't need to do anything.
2458 * Just to be sure, set the real serial port to the normal discipline.
2464 if (ppp_fd != slave_fd)
2466 (void) ioctl(ppp_fd, TIOCSETD, &tty_disc);
2467 set_ppp_fd(slave_fd);
2471 /********************************************************************
2473 * sifnpmode - Set the mode for handling packets for a given NP.
2477 sifnpmode(u, proto, mode)
2484 npi.protocol = proto;
2486 if (ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0)
2488 if (! ok_error (errno))
2490 syslog(LOG_ERR, "ioctl(PPPIOCSNPMODE, %d, %d): %m(%d)",
2491 proto, mode, errno);
2492 syslog(LOG_ERR, "ppp_fd=%d slave_fd=%d\n", ppp_fd, slave_fd);
2500 /********************************************************************
2502 * sipxfaddr - Config the interface IPX networknumber
2505 int sipxfaddr (int unit, unsigned long int network, unsigned char * node )
2512 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2514 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2517 if (! ok_error (errno))
2519 syslog (LOG_DEBUG, "socket(AF_IPX): %m(%d)", errno);
2525 memset (&ifr, '\0', sizeof (ifr));
2526 strcpy (ifr.ifr_name, ifname);
2528 memcpy (sipx->sipx_node, node, IPX_NODE_LEN);
2529 sipx->sipx_family = AF_IPX;
2530 sipx->sipx_port = 0;
2531 sipx->sipx_network = htonl (network);
2532 sipx->sipx_type = IPX_FRAME_ETHERII;
2533 sipx->sipx_action = IPX_CRTITF;
2535 * Set the IPX device
2537 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0)
2540 if (errno != EEXIST)
2542 if (! ok_error (errno))
2545 "ioctl(SIOCAIFADDR, CRTITF): %m(%d)", errno);
2550 syslog (LOG_WARNING,
2551 "ioctl(SIOCAIFADDR, CRTITF): Address already exists");
2560 /********************************************************************
2562 * cipxfaddr - Clear the information for the IPX network. The IPX routes
2563 * are removed and the device is no longer able to pass IPX
2567 int cipxfaddr (int unit)
2574 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2576 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2579 if (! ok_error (errno))
2581 syslog (LOG_DEBUG, "socket(AF_IPX): %m(%d)", errno);
2587 memset (&ifr, '\0', sizeof (ifr));
2588 strcpy (ifr.ifr_name, ifname);
2590 sipx->sipx_type = IPX_FRAME_ETHERII;
2591 sipx->sipx_action = IPX_DLTITF;
2592 sipx->sipx_family = AF_IPX;
2594 * Set the IPX device
2596 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0)
2598 if (! ok_error (errno))
2601 "ioctl(SIOCAIFADDR, IPX_DLTITF): %m(%d)", errno);
2612 * daemon - Detach us from controlling terminal session.
2615 daemon(nochdir, noclose)
2616 int nochdir, noclose;
2620 if ((pid = fork()) < 0)
2623 exit(0); /* parent dies */
2628 fclose(stdin); /* don't need stdin, stdout, stderr */
2636 * Use the hostname as part of the random number seed.
2645 for (p = hostname; *p != 0; ++p)
2650 /********************************************************************
2652 * sys_check_options - check the options that the user specified
2656 sys_check_options(void)
2659 struct stat stat_buf;
2661 * Disable the IPX protocol if the support is not present in the kernel.
2662 * If we disable it then ensure that IP support is enabled.
2664 while (ipxcp_protent.enabled_flag)
2666 if (path_to_procfs())
2668 strcat (route_buffer, "/net/ipx_interface");
2669 if (lstat (route_buffer, &stat_buf) >= 0)
2674 syslog (LOG_ERR, "IPX support is not present in the kernel\n");
2675 ipxcp_protent.enabled_flag = 0;
2676 ipcp_protent.enabled_flag = 1;
2680 if (demand && driver_is_old) {
2681 option_error("demand dialling is not supported by kernel driver version "
2682 "%d.%d.%d", driver_version, driver_modification,