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 /* We can get an EIO error on an ioctl if the modem has hung up */
96 #define ok_error(num) ((num)==EIO)
98 static int tty_disc = N_TTY; /* The TTY discipline */
99 static int ppp_disc = N_PPP; /* The PPP discpline */
100 static int initfdflags = -1; /* Initial file descriptor flags for fd */
101 static int ppp_fd = -1; /* fd which is set to PPP discipline */
102 static int sock_fd = -1; /* socket for doing interface ioctls */
103 static int slave_fd = -1;
104 static int master_fd = -1;
106 static fd_set in_fds; /* set of fds that wait_input waits for */
107 static int max_in_fd; /* highest fd set in in_fds */
109 static int has_proxy_arp = 0;
110 static int driver_version = 0;
111 static int driver_modification = 0;
112 static int driver_patch = 0;
113 static int driver_is_old = 0;
114 static int restore_term = 0; /* 1 => we've munged the terminal */
115 static struct termios inittermios; /* Initial TTY termios */
117 static char loop_name[20];
118 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
120 static int if_is_up; /* Interface has been marked up */
121 static u_int32_t default_route_gateway; /* Gateway for default route added */
122 static u_int32_t proxy_arp_addr; /* Addr for proxy arp entry added */
123 static char proxy_arp_dev[16]; /* Device for proxy arp entry */
125 static struct utsname utsname; /* for the kernel version */
126 static int kernel_version;
127 #define KVERSION(j,n,p) ((j)*1000000 + (n)*1000 + (p))
131 #define FLAGS_GOOD (IFF_UP | IFF_BROADCAST)
132 #define FLAGS_MASK (IFF_UP | IFF_BROADCAST | \
133 IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP)
135 /* Prototypes for procedures local to this file. */
136 static int get_flags (void);
137 static void set_flags (int flags);
138 static int translate_speed (int bps);
139 static int baud_rate_of (int speed);
140 static char *path_to_route (void);
141 static void close_route_table (void);
142 static int open_route_table (void);
143 static int read_route_table (struct rtentry *rt);
144 static int defaultroute_exists (struct rtentry *rt);
145 static int get_ether_addr (u_int32_t ipaddr, struct sockaddr *hwaddr,
146 char *name, int namelen);
147 static void decode_version (char *buf, int *version, int *mod, int *patch);
148 static int set_kdebugflag(int level);
149 static int ppp_registered(void);
151 extern u_char inpacket_buf[]; /* borrowed from main.c */
154 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
158 #define SET_SA_FAMILY(addr, family) \
159 memset ((char *) &(addr), '\0', sizeof(addr)); \
160 addr.sa_family = (family);
163 * Determine if the PPP connection should still be present.
168 static void set_ppp_fd (int new_fd)
170 SYSDEBUG ((LOG_DEBUG, "setting ppp_fd to %d\n", new_fd));
174 static int still_ppp(void)
176 if (!hungup || ppp_fd == slave_fd)
179 set_ppp_fd(slave_fd);
185 /********************************************************************
187 * Functions to read and set the flags value in the device driver
190 static int get_flags (void)
194 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
195 if ( ok_error (errno) )
198 fatal("ioctl(PPPIOCGFLAGS): %m");
201 SYSDEBUG ((LOG_DEBUG, "get flags = %x\n", flags));
205 /********************************************************************/
207 static void set_flags (int flags)
209 SYSDEBUG ((LOG_DEBUG, "set flags = %x\n", flags));
211 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0) {
212 if (! ok_error (errno) )
213 fatal("ioctl(PPPIOCSFLAGS, %x): %m(%d)", flags, errno);
217 /********************************************************************
219 * sys_init - System-dependent initialization.
224 int osmaj, osmin, ospatch;
226 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
227 setlogmask(LOG_UPTO(LOG_INFO));
229 setlogmask(LOG_UPTO(LOG_DEBUG));
231 /* Get an internet socket for doing socket ioctls. */
232 sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
234 if ( ! ok_error ( errno ))
235 fatal("Couldn't create IP socket: %m(%d)", errno);
242 osmaj = osmin = ospatch = 0;
243 sscanf(utsname.release, "%d.%d.%d", &osmaj, &osmin, &ospatch);
244 kernel_version = KVERSION(osmaj, osmin, ospatch);
247 /********************************************************************
249 * sys_cleanup - restore any system state we modified before exiting:
250 * mark the interface down, delete default route and/or proxy arp entry.
251 * This shouldn't call die() because it's called from die().
254 void sys_cleanup(void)
257 * Take down the device
262 * Delete any routes through the device.
264 if (default_route_gateway != 0)
265 cifdefaultroute(0, 0, default_route_gateway);
268 cifproxyarp(0, proxy_arp_addr);
271 /********************************************************************
273 * sys_close - Clean up in a child process before execing.
287 /********************************************************************
289 * set_kdebugflag - Define the debugging level for the kernel
292 static int set_kdebugflag (int requested_level)
294 if (ioctl(ppp_fd, PPPIOCSDEBUG, &requested_level) < 0) {
295 if ( ! ok_error (errno) )
296 error("ioctl(PPPIOCSDEBUG): %m");
299 SYSDEBUG ((LOG_INFO, "set kernel debugging level to %d",
304 /********************************************************************
306 * establish_ppp - Turn the serial port into a ppp interface.
309 int establish_ppp (int tty_fd)
313 * The current PPP device will be the tty file.
317 * Ensure that the tty device is in exclusive mode.
319 if (ioctl(tty_fd, TIOCEXCL, 0) < 0) {
320 if ( ! ok_error ( errno ))
321 warn("ioctl(TIOCEXCL): %m");
324 * Demand mode - prime the old ppp device to relinquish the unit.
326 if (demand && ioctl(slave_fd, PPPIOCXFERUNIT, 0) < 0)
327 fatal("ioctl(transfer ppp unit): %m(%d)", errno);
329 * Set the current tty to the PPP discpline
331 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0) {
332 if ( ! ok_error (errno) )
333 fatal("ioctl(TIOCSETD): %m(%d)", errno);
336 * Find out which interface we were given.
338 if (ioctl(ppp_fd, PPPIOCGUNIT, &x) < 0) {
339 if ( ! ok_error (errno))
340 fatal("ioctl(PPPIOCGUNIT): %m(%d)", errno);
343 * Check that we got the same unit again.
347 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
352 * Enable debug in the driver if requested.
355 set_kdebugflag (kdebugflag);
357 set_flags (get_flags() & ~(SC_RCV_B7_0 | SC_RCV_B7_1 |
358 SC_RCV_EVNP | SC_RCV_ODDP));
360 SYSDEBUG ((LOG_NOTICE, "Using version %d.%d.%d of PPP driver",
361 driver_version, driver_modification, driver_patch));
363 * Fetch the initial file flags and reset blocking mode on the file.
365 initfdflags = fcntl(ppp_fd, F_GETFL);
367 if (initfdflags == -1 ||
368 fcntl(ppp_fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
369 if ( ! ok_error (errno))
370 warn("Couldn't set device to non-blocking mode: %m");
376 /********************************************************************
378 * disestablish_ppp - Restore the serial port to normal operation.
379 * This shouldn't call die() because it's called from die().
382 void disestablish_ppp(int tty_fd)
386 * Flush the tty output buffer so that the TIOCSETD doesn't hang.
388 if (tcflush(tty_fd, TCIOFLUSH) < 0)
389 warn("tcflush failed: %m");
391 * Restore the previous line discipline
393 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0) {
394 if ( ! ok_error (errno))
395 error("ioctl(TIOCSETD, N_TTY): %m");
398 if (ioctl(tty_fd, TIOCNXCL, 0) < 0) {
399 if ( ! ok_error (errno))
400 warn("ioctl(TIOCNXCL): %m(%d)", errno);
403 /* Reset non-blocking mode on fd. */
404 if (initfdflags != -1 && fcntl(tty_fd, F_SETFL, initfdflags) < 0) {
405 if ( ! ok_error (errno))
406 warn("Couldn't restore device fd flags: %m");
412 /********************************************************************
414 * clean_check - Fetch the flags for the device and generate
415 * appropriate error messages.
417 void clean_check(void)
423 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
425 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
427 case SC_RCV_B7_0 | SC_RCV_EVNP:
428 case SC_RCV_B7_0 | SC_RCV_ODDP:
429 case SC_RCV_B7_0 | SC_RCV_ODDP | SC_RCV_EVNP:
430 s = "all had bit 7 set to 1";
434 case SC_RCV_B7_1 | SC_RCV_EVNP:
435 case SC_RCV_B7_1 | SC_RCV_ODDP:
436 case SC_RCV_B7_1 | SC_RCV_ODDP | SC_RCV_EVNP:
437 s = "all had bit 7 set to 0";
441 s = "all had odd parity";
445 s = "all had even parity";
450 warn("Receive serial link is not 8-bit clean:");
451 warn("Problem: %s", s);
459 * List of valid speeds.
463 int speed_int, speed_val;
540 /********************************************************************
542 * Translate from bits/second to a speed_t.
545 static int translate_speed (int bps)
547 struct speed *speedp;
550 for (speedp = speeds; speedp->speed_int; speedp++) {
551 if (bps == speedp->speed_int)
552 return speedp->speed_val;
554 warn("speed %d not supported", bps);
559 /********************************************************************
561 * Translate from a speed_t to bits/second.
564 static int baud_rate_of (int speed)
566 struct speed *speedp;
569 for (speedp = speeds; speedp->speed_int; speedp++) {
570 if (speed == speedp->speed_val)
571 return speedp->speed_int;
577 /********************************************************************
579 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
580 * at the requested speed, etc. If `local' is true, set CLOCAL
581 * regardless of whether the modem option was specified.
584 void set_up_tty(int tty_fd, int local)
590 if (tcgetattr(tty_fd, &tios) < 0) {
591 if (!ok_error(errno))
592 fatal("tcgetattr: %m(%d)", errno);
599 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
600 tios.c_cflag |= CS8 | CREAD | HUPCL;
602 tios.c_iflag = IGNBRK | IGNPAR;
606 tios.c_cc[VTIME] = 0;
609 tios.c_cflag ^= (CLOCAL | HUPCL);
613 tios.c_cflag |= CRTSCTS;
617 tios.c_iflag |= IXON | IXOFF;
618 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
619 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
623 tios.c_cflag &= ~CRTSCTS;
630 speed = translate_speed(inspeed);
632 cfsetospeed (&tios, speed);
633 cfsetispeed (&tios, speed);
636 * We can't proceed if the serial port speed is B0,
637 * since that implies that the serial port is disabled.
640 speed = cfgetospeed(&tios);
642 fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
645 if (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0)
646 if (!ok_error(errno))
647 fatal("tcsetattr: %m");
649 baud_rate = baud_rate_of(speed);
653 /********************************************************************
655 * setdtr - control the DTR line on the serial port.
656 * This is called from die(), so it shouldn't call die().
659 void setdtr (int tty_fd, int on)
661 int modembits = TIOCM_DTR;
663 ioctl(tty_fd, (on ? TIOCMBIS : TIOCMBIC), &modembits);
666 /********************************************************************
668 * restore_tty - restore the terminal to the saved settings.
671 void restore_tty (int tty_fd)
676 * Turn off echoing, because otherwise we can get into
677 * a loop with the tty and the modem echoing to each other.
678 * We presume we are the sole user of this tty device, so
679 * when we close it, it will revert to its defaults anyway.
682 inittermios.c_lflag &= ~(ECHO | ECHONL);
684 if (tcsetattr(tty_fd, TCSAFLUSH, &inittermios) < 0) {
685 if (! ok_error (errno))
686 warn("tcsetattr: %m");
691 /********************************************************************
693 * output - Output PPP packet.
696 void output (int unit, unsigned char *p, int len)
699 dbglog("sent %P", p, len);
701 if (write(ppp_fd, p, len) < 0) {
702 if (errno == EWOULDBLOCK || errno == ENOBUFS
703 || errno == ENXIO || errno == EIO || errno == EINTR)
704 warn("write: warning: %m (%d)", errno);
706 error("write: %m (%d)", errno);
710 /********************************************************************
712 * wait_input - wait until there is data available,
713 * for the length of time specified by *timo (indefinite
717 void wait_input(struct timeval *timo)
723 n = select(max_in_fd + 1, &ready, NULL, &ready, timo);
724 if (n < 0 && errno != EINTR)
725 fatal("select: %m(%d)", errno);
729 * add_fd - add an fd to the set that wait_input waits for.
739 * remove_fd - remove an fd from the set that wait_input waits for.
741 void remove_fd(int fd)
747 /********************************************************************
749 * wait_loop_output - wait until there is data available on the
750 * loopback, for the length of time specified by *timo (indefinite
753 void wait_loop_output(timo)
754 struct timeval *timo;
760 FD_SET(master_fd, &ready);
761 n = select(master_fd + 1, &ready, NULL, &ready, timo);
762 if (n < 0 && errno != EINTR)
763 fatal("select: %m(%d)", errno);
766 /********************************************************************
768 * wait_time - wait for a given length of time or until a
769 * signal is received.
773 struct timeval *timo;
777 n = select(0, NULL, NULL, NULL, timo);
778 if (n < 0 && errno != EINTR)
779 fatal("select: %m(%d)", errno);
783 /********************************************************************
785 * read_packet - get a PPP packet from the serial device.
788 int read_packet (unsigned char *buf)
792 len = read(ppp_fd, buf, PPP_MTU + PPP_HDRLEN);
794 if (errno == EWOULDBLOCK || errno == EIO)
796 fatal("read: %m(%d)", errno);
801 /********************************************************************
803 * get_loop_output - get outgoing packets from the ppp device,
804 * and detect when we want to bring the real link up.
805 * Return value is 1 if we need to bring up the link, 0 otherwise.
808 get_loop_output(void)
811 int n = read(master_fd, inbuf, sizeof(inbuf));
814 if (loop_chars(inbuf, n))
816 n = read(master_fd, inbuf, sizeof(inbuf));
820 fatal("eof on loopback");
822 if (errno != EWOULDBLOCK)
823 fatal("read from loopback: %m(%d)", errno);
828 /********************************************************************
830 * ppp_send_config - configure the transmit characteristics of
834 void ppp_send_config (int unit,int mtu,u_int32_t asyncmap,int pcomp,int accomp)
839 SYSDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu));
841 * Ensure that the link is still up.
846 * Set the MTU and other parameters for the ppp device
848 memset (&ifr, '\0', sizeof (ifr));
849 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
852 if (ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
853 fatal("ioctl(SIOCSIFMTU): %m(%d)", errno);
855 SYSDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
856 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
857 if (!ok_error(errno))
858 fatal("ioctl(PPPIOCSASYNCMAP): %m(%d)", errno);
863 x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
864 x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
865 x = sync_serial ? x | SC_SYNC : x & ~SC_SYNC;
869 /********************************************************************
871 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
874 void ppp_set_xaccm (int unit, ext_accm accm)
876 SYSDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
877 accm[0], accm[1], accm[2], accm[3]));
879 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) {
880 if ( ! ok_error (errno))
881 warn("ioctl(set extended ACCM): %m(%d)", errno);
885 /********************************************************************
887 * ppp_recv_config - configure the receive-side characteristics of
891 void ppp_recv_config (int unit,int mru,u_int32_t asyncmap,int pcomp,int accomp)
895 SYSDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
897 * If we were called because the link has gone down then there is nothing
898 * which may be done. Just return without incident.
903 * Set the receiver parameters
905 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
906 if ( ! ok_error (errno))
907 error("ioctl(PPPIOCSMRU): %m(%d)", errno);
910 SYSDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
911 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
912 if (!ok_error(errno))
913 error("ioctl(PPPIOCSRASYNCMAP): %m(%d)", errno);
917 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
921 /********************************************************************
923 * ccp_test - ask kernel whether a given compression method
924 * is acceptable for use.
927 int ccp_test (int unit, u_char *opt_ptr, int opt_len, int for_transmit)
929 struct ppp_option_data data;
931 memset (&data, '\0', sizeof (data));
933 data.length = opt_len;
934 data.transmit = for_transmit;
936 if (ioctl(ppp_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
939 return (errno == ENOBUFS)? 0: -1;
942 /********************************************************************
944 * ccp_flags_set - inform kernel about the current state of CCP.
947 void ccp_flags_set (int unit, int isopen, int isup)
951 x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN;
952 x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP;
957 /********************************************************************
959 * get_idle_time - return how long the link has been idle.
966 return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
969 /********************************************************************
971 * get_ppp_stats - return statistics for the link.
974 get_ppp_stats(u, stats)
976 struct pppd_stats *stats;
978 struct ifpppstatsreq req;
980 memset (&req, 0, sizeof (req));
982 req.stats_ptr = (caddr_t) &req.stats;
983 strlcpy(req.ifr__name, ifname, sizeof(req.ifr__name));
984 if (ioctl(sock_fd, SIOCGPPPSTATS, &req) < 0) {
985 error("Couldn't get PPP statistics: %m");
988 stats->bytes_in = req.stats.p.ppp_ibytes;
989 stats->bytes_out = req.stats.p.ppp_obytes;
993 /********************************************************************
995 * ccp_fatal_error - returns 1 if decompression was disabled as a
996 * result of an error detected after decompression of a packet,
997 * 0 otherwise. This is necessary because of patent nonsense.
1000 int ccp_fatal_error (int unit)
1002 int x = get_flags();
1004 return x & SC_DC_FERROR;
1008 * path_to_route - determine the path to the proc file system data
1010 #define ROUTE_MAX_COLS 12
1011 FILE *route_fd = (FILE *) 0;
1012 static char route_buffer [512];
1013 static int route_dev_col, route_dest_col, route_gw_col;
1014 static int route_flags_col, route_mask_col;
1015 static int route_num_cols;
1017 static char *path_to_route (void);
1018 static int open_route_table (void);
1019 static void close_route_table (void);
1020 static int read_route_table (struct rtentry *rt);
1022 /********************************************************************
1024 * path_to_procfs - find the path to the proc file system mount point
1027 static int path_to_procfs (const char *tail)
1029 struct mntent *mntent;
1032 fp = fopen(MOUNTED, "r");
1034 /* Default the mount location of /proc */
1035 strlcpy (route_buffer, "/proc", sizeof (route_buffer));
1036 strlcat (route_buffer, tail, sizeof(route_buffer));
1040 while ((mntent = getmntent(fp)) != NULL) {
1041 if (strcmp(mntent->mnt_type, MNTTYPE_IGNORE) == 0)
1043 if (strcmp(mntent->mnt_type, "proc") == 0)
1050 strlcpy(route_buffer, mntent->mnt_dir, sizeof (route_buffer));
1051 strlcat (route_buffer, tail, sizeof(route_buffer));
1055 /********************************************************************
1057 * path_to_route - find the path to the route tables in the proc file system
1060 static char *path_to_route (void)
1062 if (!path_to_procfs("/net/route")) {
1063 error("proc file system not mounted");
1066 return (route_buffer);
1069 /********************************************************************
1071 * close_route_table - close the interface to the route table
1074 static void close_route_table (void)
1076 if (route_fd != (FILE *) 0) {
1078 route_fd = (FILE *) 0;
1082 /********************************************************************
1084 * open_route_table - open the interface to the route table
1086 static char route_delims[] = " \t\n";
1088 static int open_route_table (void)
1092 close_route_table();
1094 path = path_to_route();
1098 route_fd = fopen (path, "r");
1099 if (route_fd == NULL) {
1100 error("can't open %s: %m (%d)", path, errno);
1104 route_dev_col = 0; /* default to usual columns */
1107 route_flags_col = 3;
1111 /* parse header line */
1112 if (fgets(route_buffer, sizeof(route_buffer), route_fd) != 0) {
1113 char *p = route_buffer, *q;
1115 for (col = 0; col < ROUTE_MAX_COLS; ++col) {
1117 if ((q = strtok(p, route_delims)) == 0)
1119 if (strcasecmp(q, "iface") == 0)
1120 route_dev_col = col;
1121 else if (strcasecmp(q, "destination") == 0)
1122 route_dest_col = col;
1123 else if (strcasecmp(q, "gateway") == 0)
1125 else if (strcasecmp(q, "flags") == 0)
1126 route_flags_col = col;
1127 else if (strcasecmp(q, "mask") == 0)
1128 route_mask_col = col;
1131 if (used && col >= route_num_cols)
1132 route_num_cols = col + 1;
1140 /********************************************************************
1142 * read_route_table - read the next entry from the route table
1145 static int read_route_table(struct rtentry *rt)
1147 char *cols[ROUTE_MAX_COLS], *p;
1150 memset (rt, '\0', sizeof (struct rtentry));
1152 if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
1156 for (col = 0; col < route_num_cols; ++col) {
1157 cols[col] = strtok(p, route_delims);
1158 if (cols[col] == NULL)
1159 return 0; /* didn't get enough columns */
1162 ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr =
1163 strtoul(cols[route_dest_col], NULL, 16);
1165 ((struct sockaddr_in *) &rt->rt_gateway)->sin_addr.s_addr =
1166 strtoul(cols[route_gw_col], NULL, 16);
1168 ((struct sockaddr_in *) &rt->rt_genmask)->sin_addr.s_addr =
1169 strtoul(cols[route_mask_col], NULL, 16);
1171 rt->rt_flags = (short) strtoul(cols[route_flags_col], NULL, 16);
1172 rt->rt_dev = cols[route_dev_col];
1177 /********************************************************************
1179 * defaultroute_exists - determine if there is a default route
1182 static int defaultroute_exists (struct rtentry *rt)
1186 if (!open_route_table())
1189 while (read_route_table(rt) != 0) {
1190 if ((rt->rt_flags & RTF_UP) == 0)
1193 if (((struct sockaddr_in *) (&rt->rt_dst))->sin_addr.s_addr == 0L) {
1199 close_route_table();
1204 * have_route_to - determine if the system has any route to
1205 * a given IP address. `addr' is in network byte order.
1206 * Return value is 1 if yes, 0 if no, -1 if don't know.
1207 * For demand mode to work properly, we have to ignore routes
1208 * through our own interface.
1210 int have_route_to(u_int32_t addr)
1215 if (!open_route_table())
1216 return -1; /* don't know */
1218 while (read_route_table(&rt)) {
1219 if ((rt.rt_flags & RTF_UP) == 0 || strcmp(rt.rt_dev, ifname) == 0)
1221 if ((addr & ((struct sockaddr_in *)&rt.rt_genmask)->sin_addr.s_addr)
1222 == ((struct sockaddr_in *)&rt.rt_dst)->sin_addr.s_addr) {
1228 close_route_table();
1232 /********************************************************************
1234 * sifdefaultroute - assign a default route through the address given.
1237 int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1241 if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
1242 struct in_addr old_gateway =
1243 ((struct sockaddr_in *) (&rt.rt_gateway))-> sin_addr;
1245 if (old_gateway.s_addr != gateway)
1246 error("not replacing existing default route to %s [%I]",
1247 rt.rt_dev, old_gateway);
1251 memset (&rt, '\0', sizeof (rt));
1252 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1253 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1255 if (kernel_version > KVERSION(2,1,0)) {
1256 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1257 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = 0L;
1260 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
1262 rt.rt_flags = RTF_UP | RTF_GATEWAY | RTF_DEFAULT;
1263 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
1264 if ( ! ok_error ( errno ))
1265 error("default route ioctl(SIOCADDRT): %m(%d)", errno);
1269 default_route_gateway = gateway;
1273 /********************************************************************
1275 * cifdefaultroute - delete a default route through the address given.
1278 int cifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1282 default_route_gateway = 0;
1284 memset (&rt, '\0', sizeof (rt));
1285 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1286 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1288 if (kernel_version > KVERSION(2,1,0)) {
1289 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1290 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = 0L;
1293 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
1295 rt.rt_flags = RTF_UP | RTF_GATEWAY | RTF_DEFAULT;
1296 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
1298 if ( ! ok_error ( errno ))
1299 error("default route ioctl(SIOCDELRT): %m (%d)", errno);
1307 /********************************************************************
1309 * sifproxyarp - Make a proxy ARP entry for the peer.
1312 int sifproxyarp (int unit, u_int32_t his_adr)
1314 struct arpreq arpreq;
1316 if (has_proxy_arp == 0) {
1317 memset (&arpreq, '\0', sizeof(arpreq));
1319 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1320 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
1321 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1323 * Get the hardware address of an interface on the same subnet
1324 * as our local address.
1326 if (!get_ether_addr(his_adr, &arpreq.arp_ha, proxy_arp_dev,
1327 sizeof(proxy_arp_dev))) {
1328 error("Cannot determine ethernet address for proxy ARP");
1331 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1333 if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1334 if ( ! ok_error ( errno ))
1335 error("ioctl(SIOCSARP): %m(%d)", errno);
1338 proxy_arp_addr = his_adr;
1345 /********************************************************************
1347 * cifproxyarp - Delete the proxy ARP entry for the peer.
1350 int cifproxyarp (int unit, u_int32_t his_adr)
1352 struct arpreq arpreq;
1354 if (has_proxy_arp) {
1356 memset (&arpreq, '\0', sizeof(arpreq));
1357 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1358 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
1359 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1360 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1362 if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1363 if ( ! ok_error ( errno ))
1364 warn("ioctl(SIOCDARP): %m(%d)", errno);
1371 /********************************************************************
1373 * get_ether_addr - get the hardware address of an interface on the
1374 * the same subnet as ipaddr.
1377 static int get_ether_addr (u_int32_t ipaddr,
1378 struct sockaddr *hwaddr,
1379 char *name, int namelen)
1381 struct ifreq *ifr, *ifend;
1382 u_int32_t ina, mask;
1385 struct ifreq ifs[MAX_IFS];
1387 ifc.ifc_len = sizeof(ifs);
1389 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1390 if ( ! ok_error ( errno ))
1391 error("ioctl(SIOCGIFCONF): %m(%d)", errno);
1395 SYSDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s",
1396 ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr)));
1398 * Scan through looking for an interface with an Internet
1399 * address on the same subnet as `ipaddr'.
1401 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
1402 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1403 if (ifr->ifr_addr.sa_family == AF_INET) {
1404 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1405 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1406 SYSDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s",
1409 * Check that the interface is up, and not point-to-point
1412 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1415 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1418 * Get its netmask and check that it's on the right subnet.
1420 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1423 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1424 SYSDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx",
1425 ip_ntoa(ina), ntohl(mask)));
1427 if (((ipaddr ^ ina) & mask) != 0)
1436 strlcpy(name, ifreq.ifr_name, namelen);
1437 info("found interface %s for proxy arp", name);
1439 * Now get the hardware address.
1441 memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
1442 if (ioctl (sock_fd, SIOCGIFHWADDR, &ifreq) < 0) {
1443 error("SIOCGIFHWADDR(%s): %m(%d)", ifreq.ifr_name, errno);
1449 sizeof (struct sockaddr));
1451 SYSDEBUG ((LOG_DEBUG,
1452 "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
1453 (int) ((unsigned char *) &hwaddr->sa_data)[0],
1454 (int) ((unsigned char *) &hwaddr->sa_data)[1],
1455 (int) ((unsigned char *) &hwaddr->sa_data)[2],
1456 (int) ((unsigned char *) &hwaddr->sa_data)[3],
1457 (int) ((unsigned char *) &hwaddr->sa_data)[4],
1458 (int) ((unsigned char *) &hwaddr->sa_data)[5],
1459 (int) ((unsigned char *) &hwaddr->sa_data)[6],
1460 (int) ((unsigned char *) &hwaddr->sa_data)[7]));
1464 /********************************************************************
1466 * Return user specified netmask, modified by any mask we might determine
1467 * for address `addr' (in network byte order).
1468 * Here we scan through the system's list of interfaces, looking for
1469 * any non-point-to-point interfaces which might appear to be on the same
1470 * network as `addr'. If we find any, we OR in their netmask to the
1471 * user-specified netmask.
1474 u_int32_t GetMask (u_int32_t addr)
1476 u_int32_t mask, nmask, ina;
1477 struct ifreq *ifr, *ifend, ifreq;
1479 struct ifreq ifs[MAX_IFS];
1483 if (IN_CLASSA(addr)) /* determine network mask for address class */
1484 nmask = IN_CLASSA_NET;
1485 else if (IN_CLASSB(addr))
1486 nmask = IN_CLASSB_NET;
1488 nmask = IN_CLASSC_NET;
1490 /* class D nets are disallowed by bad_ip_adrs */
1491 mask = netmask | htonl(nmask);
1493 * Scan through the system's network interfaces.
1495 ifc.ifc_len = sizeof(ifs);
1497 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1498 if ( ! ok_error ( errno ))
1499 warn("ioctl(SIOCGIFCONF): %m(%d)", errno);
1503 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1504 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1506 * Check the interface's internet address.
1508 if (ifr->ifr_addr.sa_family != AF_INET)
1510 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1511 if (((ntohl(ina) ^ addr) & nmask) != 0)
1514 * Check that the interface is up, and not point-to-point nor loopback.
1516 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1517 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1520 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1523 * Get its netmask and OR it into our mask.
1525 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1527 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1533 /********************************************************************
1535 * Internal routine to decode the version.modification.patch level
1538 static void decode_version (char *buf, int *version,
1539 int *modification, int *patch)
1541 *version = (int) strtoul (buf, &buf, 10);
1547 *modification = (int) strtoul (buf, &buf, 10);
1550 *patch = (int) strtoul (buf, &buf, 10);
1561 /********************************************************************
1563 * Procedure to determine if the PPP line discipline is registered.
1567 ppp_registered(void)
1575 * We used to open the serial device and set it to the ppp line
1576 * discipline here, in order to create a ppp unit. But that is
1577 * not a good idea - the user might have specified a device that
1578 * they can't open (permission, or maybe it doesn't really exist).
1579 * So we grab a pty master/slave pair and use that.
1581 if (!get_pty(&mfd, &local_fd, slave, 0)) {
1582 no_ppp_msg = "Couldn't determine if PPP is supported (no free ptys)";
1587 * Try to put the device into the PPP discipline.
1589 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0) {
1590 error("ioctl(TIOCSETD(PPP)): %m(%d)", errno);
1599 /********************************************************************
1601 * ppp_available - check whether the system has any ppp interfaces
1602 * (in fact we check whether we can do an ioctl on ppp0).
1605 int ppp_available(void)
1610 int my_version, my_modification, my_patch;
1613 "This system lacks kernel support for PPP. This could be because\n"
1614 "the PPP kernel module could not be loaded, or because PPP was not\n"
1615 "included in the kernel configuration. If PPP was included as a\n"
1616 "module, try `/sbin/modprobe -v ppp'. If that fails, check that\n"
1617 "ppp.o exists in /lib/modules/`uname -r`/net.\n"
1618 "See README.linux file in the ppp distribution for more details.\n";
1621 * Open a socket for doing the ioctl operations.
1623 s = socket(AF_INET, SOCK_DGRAM, 0);
1627 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1628 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1630 * If the device did not exist then attempt to create one by putting the
1631 * current tty into the PPP discipline. If this works then obtain the
1632 * flags for the device again.
1635 if (ppp_registered()) {
1636 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1637 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1641 * Ensure that the hardware address is for PPP and not something else
1644 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
1646 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
1650 * This is the PPP device. Validate the version of the driver at this
1651 * point to ensure that this program will work with the driver.
1654 char abBuffer [1024];
1656 ifr.ifr_data = abBuffer;
1657 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
1659 error("Couldn't read driver version: %m");
1661 no_ppp_msg = "Sorry, couldn't verify kernel driver version\n";
1664 decode_version(abBuffer,
1666 &driver_modification,
1669 * Validate the version of the driver against the version that we used.
1671 decode_version(VERSION,
1676 /* The version numbers must match */
1677 if (driver_version != my_version)
1680 /* The modification levels must be legal */
1681 if (driver_modification < 3) {
1682 if (driver_modification >= 2) {
1683 /* we can cope with 2.2.0 and above */
1692 slprintf(route_buffer, sizeof(route_buffer),
1693 "Sorry - PPP driver version %d.%d.%d is out of date\n",
1694 driver_version, driver_modification, driver_patch);
1696 no_ppp_msg = route_buffer;
1703 /********************************************************************
1705 * Update the wtmp file with the appropriate user name and tty device.
1708 void logwtmp (const char *line, const char *name, const char *host)
1711 struct utmp ut, *utp;
1712 pid_t mypid = getpid();
1714 * Update the signon database for users.
1715 * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996
1717 utmpname(_PATH_UTMP);
1719 while ((utp = getutent()) && (utp->ut_pid != mypid))
1722 /* Is this call really necessary? There is another one after the 'put' */
1726 memcpy(&ut, utp, sizeof(ut));
1728 /* some gettys/telnetds don't initialize utmp... */
1729 memset(&ut, 0, sizeof(ut));
1731 if (ut.ut_id[0] == 0)
1732 strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
1734 strncpy(ut.ut_user, name, sizeof(ut.ut_user));
1735 strncpy(ut.ut_line, line, sizeof(ut.ut_line));
1739 ut.ut_type = USER_PROCESS;
1742 /* Insert the host name if one is supplied */
1744 strncpy (ut.ut_host, host, sizeof(ut.ut_host));
1746 /* Insert the IP address of the remote system if IP is enabled */
1747 if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr)
1748 memcpy(&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr,
1749 sizeof(ut.ut_addr));
1751 /* CL: Makes sure that the logout works */
1752 if (*host == 0 && *name==0)
1758 * Update the wtmp file.
1760 wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY);
1762 flock(wtmp, LOCK_EX);
1764 /* we really should check for error on the write for a full disk! */
1765 write (wtmp, (char *)&ut, sizeof(ut));
1768 flock(wtmp, LOCK_UN);
1773 /********************************************************************
1774 * Code for locking/unlocking the serial device.
1775 * This code is derived from chat.c.
1779 #define LOCK_PREFIX "/var/lock/LCK.."
1782 static char *lock_file;
1785 * lock - create a lock file for the named device
1788 int lock (char *dev)
1792 lock_file = strdup(dev);
1793 if (lock_file == NULL)
1794 novm("lock file name");
1795 result = mklock (dev, (void *) 0);
1798 notice("Device %s is locked by pid %d", dev, result);
1805 error("Can't create lock file %s", lock_file);
1813 char hdb_lock_buffer[12];
1819 p = strrchr(dev, '/');
1823 l = strlen(LOCK_PREFIX) + strlen(dev) + 1;
1824 lock_file = malloc(l);
1825 if (lock_file == NULL)
1826 novm("lock file name");
1828 slprintf(lock_file, l, "%s%s", LOCK_PREFIX, dev);
1830 * Attempt to create the lock file at this point.
1833 fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644);
1837 slprintf(hdb_lock_buffer, sizeof(hdb_lock_buffer), "%010d\n", pid);
1838 write (fd, hdb_lock_buffer, 11);
1840 write(fd, &pid, sizeof (pid));
1846 * If the file exists then check to see if the pid is stale
1848 if (errno == EEXIST) {
1849 fd = open(lock_file, O_RDONLY, 0);
1851 if (errno == ENOENT) /* This is just a timing problem. */
1856 /* Read the lock file to find out who has the device locked */
1857 n = read (fd, hdb_lock_buffer, 11);
1860 error("Can't read pid from lock file %s", lock_file);
1864 /* See the process still exists. */
1867 hdb_lock_buffer[n] = '\0';
1868 sscanf (hdb_lock_buffer, " %d", &pid);
1870 pid = ((int *) hdb_lock_buffer)[0];
1872 if (pid == 0 || pid == getpid()
1873 || (kill(pid, 0) == -1 && errno == ESRCH))
1877 /* If the process does not exist then try to remove the lock */
1878 if (n == 0 && unlink (lock_file) == 0) {
1879 notice("Removed stale lock on %s (pid %d)",
1884 notice("Device %s is locked by pid %d", dev, pid);
1888 error("Can't create lock file %s: %m(%d)", lock_file, errno);
1899 /********************************************************************
1901 * unlock - remove our lockfile
1908 (void) rmlock (lock_file, (void *) 0);
1918 /********************************************************************
1920 * sifvjcomp - config tcp header compression
1923 int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
1925 u_int x = get_flags();
1928 if (ioctl (ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
1929 if (! ok_error (errno))
1930 error("ioctl(PPPIOCSMAXCID): %m(%d)", errno);
1935 x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
1936 x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
1942 /********************************************************************
1944 * sifup - Config the interface up and enable IP packets to pass.
1951 memset (&ifr, '\0', sizeof (ifr));
1952 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1953 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
1954 if (! ok_error (errno))
1955 error("ioctl (SIOCGIFFLAGS): %m(%d)", errno);
1959 ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
1960 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
1961 if (! ok_error (errno))
1962 error("ioctl(SIOCSIFFLAGS): %m(%d)", errno);
1969 /********************************************************************
1971 * sifdown - Config the interface down and disable IP.
1980 memset (&ifr, '\0', sizeof (ifr));
1981 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1982 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
1983 if (! ok_error (errno))
1984 error("ioctl (SIOCGIFFLAGS): %m(%d)", errno);
1988 ifr.ifr_flags &= ~IFF_UP;
1989 ifr.ifr_flags |= IFF_POINTOPOINT;
1990 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
1991 if (! ok_error (errno))
1992 error("ioctl(SIOCSIFFLAGS): %m(%d)", errno);
1998 /********************************************************************
2000 * sifaddr - Config the interface IP addresses and netmask.
2003 int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr,
2009 memset (&ifr, '\0', sizeof (ifr));
2010 memset (&rt, '\0', sizeof (rt));
2012 SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
2013 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
2014 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
2016 strlcpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2018 * Set our IP address
2020 ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = our_adr;
2021 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2022 if (errno != EEXIST) {
2023 if (! ok_error (errno))
2024 error("ioctl(SIOCSIFADDR): %m(%d)", errno);
2027 warn("ioctl(SIOCSIFADDR): Address already exists");
2032 * Set the gateway address
2034 ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = his_adr;
2035 if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
2036 if (! ok_error (errno))
2037 error("ioctl(SIOCSIFDSTADDR): %m(%d)", errno);
2042 * For recent kernels, force the netmask to 255.255.255.255.
2044 if (kernel_version >= KVERSION(2,1,16))
2046 if (net_mask != 0) {
2047 ((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = net_mask;
2048 if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
2049 if (! ok_error (errno))
2050 error("ioctl(SIOCSIFNETMASK): %m(%d)", errno);
2055 * Add the device route
2057 if (kernel_version < KVERSION(2,1,16)) {
2058 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2059 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2062 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0L;
2063 ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
2064 rt.rt_flags = RTF_UP | RTF_HOST;
2066 if (kernel_version > KVERSION(2,1,0)) {
2067 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2068 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = -1L;
2071 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
2072 if (! ok_error (errno))
2073 error("ioctl(SIOCADDRT) device route: %m(%d)", errno);
2080 /********************************************************************
2082 * cifaddr - Clear the interface IP addresses, and delete routes
2083 * through the interface if possible.
2086 int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
2090 if (kernel_version < KVERSION(2,1,16)) {
2092 * Delete the route through the device
2094 memset (&rt, '\0', sizeof (rt));
2096 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2097 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2100 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
2101 ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
2102 rt.rt_flags = RTF_UP | RTF_HOST;
2104 if (kernel_version > KVERSION(2,1,0)) {
2105 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2106 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = -1L;
2109 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
2110 if (still_ppp() && ! ok_error (errno))
2111 error("ioctl(SIOCDELRT) device route: %m(%d)", errno);
2119 * get_pty - get a pty master/slave pair and chown the slave side
2120 * to the uid given. Assumes slave_name points to >= 12 bytes of space.
2123 get_pty(master_fdp, slave_fdp, slave_name, uid)
2131 struct termios tios;
2134 for (i = 0; i < 64; ++i) {
2135 slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x",
2136 'p' + i / 16, i % 16);
2137 mfd = open(pty_name, O_RDWR, 0);
2140 sfd = open(pty_name, O_RDWR | O_NOCTTY, 0);
2149 strlcpy(slave_name, pty_name, 12);
2152 fchown(sfd, uid, -1);
2153 fchmod(sfd, S_IRUSR | S_IWUSR);
2154 if (tcgetattr(sfd, &tios) == 0) {
2155 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
2156 tios.c_cflag |= CS8 | CREAD;
2157 tios.c_iflag = IGNPAR | CLOCAL;
2160 if (tcsetattr(sfd, TCSAFLUSH, &tios) < 0)
2161 warn("couldn't set attributes on pty: %m");
2163 warn("couldn't get attributes on pty: %m");
2168 /********************************************************************
2170 * open_loopback - open the device we use for getting packets
2171 * in demand mode. Under Linux, we use a pty master/slave pair.
2174 open_ppp_loopback(void)
2178 if (!get_pty(&master_fd, &slave_fd, loop_name, 0))
2179 fatal("No free pty for loopback");
2180 SYSDEBUG(("using %s for loopback", loop_name));
2182 set_ppp_fd(slave_fd);
2184 flags = fcntl(master_fd, F_GETFL);
2186 fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2187 warn("couldn't set master loopback to nonblock: %m(%d)", errno);
2189 flags = fcntl(ppp_fd, F_GETFL);
2191 fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2192 warn("couldn't set slave loopback to nonblock: %m(%d)", errno);
2194 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
2195 fatal("ioctl(TIOCSETD): %m(%d)", errno);
2197 * Find out which interface we were given.
2199 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
2200 fatal("ioctl(PPPIOCGUNIT): %m(%d)", errno);
2202 * Enable debug in the driver if requested.
2204 set_kdebugflag (kdebugflag);
2209 /********************************************************************
2211 * restore_loop - reattach the ppp unit to the loopback.
2213 * The kernel ppp driver automatically reattaches the ppp unit to
2214 * the loopback if the serial port is set to a line discipline other
2215 * than ppp, or if it detects a modem hangup. The former will happen
2216 * in disestablish_ppp if the latter hasn't already happened, so we
2217 * shouldn't need to do anything.
2219 * Just to be sure, set the real serial port to the normal discipline.
2225 if (ppp_fd != slave_fd) {
2226 (void) ioctl(ppp_fd, TIOCSETD, &tty_disc);
2227 set_ppp_fd(slave_fd);
2231 /********************************************************************
2233 * sifnpmode - Set the mode for handling packets for a given NP.
2237 sifnpmode(u, proto, mode)
2244 npi.protocol = proto;
2246 if (ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
2247 if (! ok_error (errno)) {
2248 error("ioctl(PPPIOCSNPMODE, %d, %d): %m (%d)",
2249 proto, mode, errno);
2250 error("ppp_fd=%d slave_fd=%d\n", ppp_fd, slave_fd);
2258 /********************************************************************
2260 * sipxfaddr - Config the interface IPX networknumber
2263 int sipxfaddr (int unit, unsigned long int network, unsigned char * node )
2270 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2272 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2274 if (! ok_error (errno))
2275 dbglog("socket(AF_IPX): %m (%d)", errno);
2279 memset (&ifr, '\0', sizeof (ifr));
2280 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2282 memcpy (sipx->sipx_node, node, IPX_NODE_LEN);
2283 sipx->sipx_family = AF_IPX;
2284 sipx->sipx_port = 0;
2285 sipx->sipx_network = htonl (network);
2286 sipx->sipx_type = IPX_FRAME_ETHERII;
2287 sipx->sipx_action = IPX_CRTITF;
2289 * Set the IPX device
2291 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2293 if (errno != EEXIST) {
2294 if (! ok_error (errno))
2295 dbglog("ioctl(SIOCSIFADDR, CRTITF): %m (%d)", errno);
2298 warn("ioctl(SIOCSIFADDR, CRTITF): Address already exists");
2307 /********************************************************************
2309 * cipxfaddr - Clear the information for the IPX network. The IPX routes
2310 * are removed and the device is no longer able to pass IPX
2314 int cipxfaddr (int unit)
2321 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2323 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2325 if (! ok_error (errno))
2326 dbglog("socket(AF_IPX): %m (%d)", errno);
2330 memset (&ifr, '\0', sizeof (ifr));
2331 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2333 sipx->sipx_type = IPX_FRAME_ETHERII;
2334 sipx->sipx_action = IPX_DLTITF;
2335 sipx->sipx_family = AF_IPX;
2337 * Set the IPX device
2339 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2340 if (! ok_error (errno))
2341 info("ioctl(SIOCSIFADDR, IPX_DLTITF): %m (%d)", errno);
2352 * daemon - Detach us from controlling terminal session.
2355 daemon(nochdir, noclose)
2356 int nochdir, noclose;
2360 if ((pid = fork()) < 0)
2363 exit(0); /* parent dies */
2368 fclose(stdin); /* don't need stdin, stdout, stderr */
2377 * Use the hostname as part of the random number seed.
2386 for (p = hostname; *p != 0; ++p)
2391 /********************************************************************
2393 * sys_check_options - check the options that the user specified
2397 sys_check_options(void)
2401 * Disable the IPX protocol if the support is not present in the kernel.
2403 if (ipxcp_protent.enabled_flag) {
2404 struct stat stat_buf;
2405 if (path_to_procfs("/net/ipx_interface")
2406 || lstat (route_buffer, &stat_buf) < 0) {
2407 error("IPX support is not present in the kernel\n");
2408 ipxcp_protent.enabled_flag = 0;
2412 if (demand && driver_is_old) {
2413 option_error("demand dialling is not supported by kernel driver "
2414 "version %d.%d.%d", driver_version, driver_modification,