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)
385 * Attempt to restore the previous tty settings
389 * Restore the previous line discipline
391 tcflush(tty_fd, TCIOFLUSH);
392 if (ioctl(tty_fd, TIOCSETD, &tty_disc) < 0) {
393 if ( ! ok_error (errno))
394 error("ioctl(TIOCSETD, N_TTY): %m");
397 if (ioctl(tty_fd, TIOCNXCL, 0) < 0) {
398 if ( ! ok_error (errno))
399 warn("ioctl(TIOCNXCL): %m(%d)", errno);
402 /* Reset non-blocking mode on fd. */
403 if (initfdflags != -1 && fcntl(tty_fd, F_SETFL, initfdflags) < 0) {
404 if ( ! ok_error (errno))
405 warn("Couldn't restore device fd flags: %m");
411 /********************************************************************
413 * clean_check - Fetch the flags for the device and generate
414 * appropriate error messages.
416 void clean_check(void)
422 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
424 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
426 case SC_RCV_B7_0 | SC_RCV_EVNP:
427 case SC_RCV_B7_0 | SC_RCV_ODDP:
428 case SC_RCV_B7_0 | SC_RCV_ODDP | SC_RCV_EVNP:
429 s = "all had bit 7 set to 1";
433 case SC_RCV_B7_1 | SC_RCV_EVNP:
434 case SC_RCV_B7_1 | SC_RCV_ODDP:
435 case SC_RCV_B7_1 | SC_RCV_ODDP | SC_RCV_EVNP:
436 s = "all had bit 7 set to 0";
440 s = "all had odd parity";
444 s = "all had even parity";
449 warn("Receive serial link is not 8-bit clean:");
450 warn("Problem: %s", s);
458 * List of valid speeds.
462 int speed_int, speed_val;
539 /********************************************************************
541 * Translate from bits/second to a speed_t.
544 static int translate_speed (int bps)
546 struct speed *speedp;
549 for (speedp = speeds; speedp->speed_int; speedp++) {
550 if (bps == speedp->speed_int)
551 return speedp->speed_val;
553 warn("speed %d not supported", bps);
558 /********************************************************************
560 * Translate from a speed_t to bits/second.
563 static int baud_rate_of (int speed)
565 struct speed *speedp;
568 for (speedp = speeds; speedp->speed_int; speedp++) {
569 if (speed == speedp->speed_val)
570 return speedp->speed_int;
576 /********************************************************************
578 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
579 * at the requested speed, etc. If `local' is true, set CLOCAL
580 * regardless of whether the modem option was specified.
583 void set_up_tty(int tty_fd, int local)
589 if (tcgetattr(tty_fd, &tios) < 0) {
590 if (!ok_error(errno))
591 fatal("tcgetattr: %m(%d)", errno);
598 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
599 tios.c_cflag |= CS8 | CREAD | HUPCL;
601 tios.c_iflag = IGNBRK | IGNPAR;
605 tios.c_cc[VTIME] = 0;
608 tios.c_cflag ^= (CLOCAL | HUPCL);
612 tios.c_cflag |= CRTSCTS;
616 tios.c_iflag |= IXON | IXOFF;
617 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
618 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
622 tios.c_cflag &= ~CRTSCTS;
629 speed = translate_speed(inspeed);
631 cfsetospeed (&tios, speed);
632 cfsetispeed (&tios, speed);
635 * We can't proceed if the serial port speed is B0,
636 * since that implies that the serial port is disabled.
639 speed = cfgetospeed(&tios);
641 fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
644 if (tcsetattr(tty_fd, TCSAFLUSH, &tios) < 0)
645 if (!ok_error(errno))
646 fatal("tcsetattr: %m");
648 baud_rate = baud_rate_of(speed);
652 /********************************************************************
654 * setdtr - control the DTR line on the serial port.
655 * This is called from die(), so it shouldn't call die().
658 void setdtr (int tty_fd, int on)
660 int modembits = TIOCM_DTR;
662 ioctl(tty_fd, (on ? TIOCMBIS : TIOCMBIC), &modembits);
665 /********************************************************************
667 * restore_tty - restore the terminal to the saved settings.
670 void restore_tty (int tty_fd)
675 * Turn off echoing, because otherwise we can get into
676 * a loop with the tty and the modem echoing to each other.
677 * We presume we are the sole user of this tty device, so
678 * when we close it, it will revert to its defaults anyway.
681 inittermios.c_lflag &= ~(ECHO | ECHONL);
683 if (tcsetattr(tty_fd, TCSAFLUSH, &inittermios) < 0) {
684 if (! ok_error (errno))
685 warn("tcsetattr: %m");
690 /********************************************************************
692 * output - Output PPP packet.
695 void output (int unit, unsigned char *p, int len)
698 dbglog("sent %P", p, len);
700 if (write(ppp_fd, p, len) < 0) {
701 if (errno == EWOULDBLOCK || errno == ENOBUFS
702 || errno == ENXIO || errno == EIO || errno == EINTR)
703 warn("write: warning: %m (%d)", errno);
705 error("write: %m (%d)", errno);
709 /********************************************************************
711 * wait_input - wait until there is data available,
712 * for the length of time specified by *timo (indefinite
716 void wait_input(struct timeval *timo)
722 n = select(max_in_fd + 1, &ready, NULL, &ready, timo);
723 if (n < 0 && errno != EINTR)
724 fatal("select: %m(%d)", errno);
728 * add_fd - add an fd to the set that wait_input waits for.
738 * remove_fd - remove an fd from the set that wait_input waits for.
740 void remove_fd(int fd)
746 /********************************************************************
748 * wait_loop_output - wait until there is data available on the
749 * loopback, for the length of time specified by *timo (indefinite
752 void wait_loop_output(timo)
753 struct timeval *timo;
759 FD_SET(master_fd, &ready);
760 n = select(master_fd + 1, &ready, NULL, &ready, timo);
761 if (n < 0 && errno != EINTR)
762 fatal("select: %m(%d)", errno);
765 /********************************************************************
767 * wait_time - wait for a given length of time or until a
768 * signal is received.
772 struct timeval *timo;
776 n = select(0, NULL, NULL, NULL, timo);
777 if (n < 0 && errno != EINTR)
778 fatal("select: %m(%d)", errno);
782 /********************************************************************
784 * read_packet - get a PPP packet from the serial device.
787 int read_packet (unsigned char *buf)
791 len = read(ppp_fd, buf, PPP_MTU + PPP_HDRLEN);
793 if (errno == EWOULDBLOCK || errno == EIO)
795 fatal("read: %m(%d)", errno);
800 /********************************************************************
802 * get_loop_output - get outgoing packets from the ppp device,
803 * and detect when we want to bring the real link up.
804 * Return value is 1 if we need to bring up the link, 0 otherwise.
807 get_loop_output(void)
810 int n = read(master_fd, inbuf, sizeof(inbuf));
813 if (loop_chars(inbuf, n))
815 n = read(master_fd, inbuf, sizeof(inbuf));
819 fatal("eof on loopback");
821 if (errno != EWOULDBLOCK)
822 fatal("read from loopback: %m(%d)", errno);
827 /********************************************************************
829 * ppp_send_config - configure the transmit characteristics of
833 void ppp_send_config (int unit,int mtu,u_int32_t asyncmap,int pcomp,int accomp)
838 SYSDEBUG ((LOG_DEBUG, "send_config: mtu = %d\n", mtu));
840 * Ensure that the link is still up.
845 * Set the MTU and other parameters for the ppp device
847 memset (&ifr, '\0', sizeof (ifr));
848 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
851 if (ioctl(sock_fd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
852 fatal("ioctl(SIOCSIFMTU): %m(%d)", errno);
854 SYSDEBUG ((LOG_DEBUG, "send_config: asyncmap = %lx\n", asyncmap));
855 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
856 if (!ok_error(errno))
857 fatal("ioctl(PPPIOCSASYNCMAP): %m(%d)", errno);
862 x = pcomp ? x | SC_COMP_PROT : x & ~SC_COMP_PROT;
863 x = accomp ? x | SC_COMP_AC : x & ~SC_COMP_AC;
864 x = sync_serial ? x | SC_SYNC : x & ~SC_SYNC;
868 /********************************************************************
870 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
873 void ppp_set_xaccm (int unit, ext_accm accm)
875 SYSDEBUG ((LOG_DEBUG, "set_xaccm: %08lx %08lx %08lx %08lx\n",
876 accm[0], accm[1], accm[2], accm[3]));
878 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) {
879 if ( ! ok_error (errno))
880 warn("ioctl(set extended ACCM): %m(%d)", errno);
884 /********************************************************************
886 * ppp_recv_config - configure the receive-side characteristics of
890 void ppp_recv_config (int unit,int mru,u_int32_t asyncmap,int pcomp,int accomp)
894 SYSDEBUG ((LOG_DEBUG, "recv_config: mru = %d\n", mru));
896 * If we were called because the link has gone down then there is nothing
897 * which may be done. Just return without incident.
902 * Set the receiver parameters
904 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
905 if ( ! ok_error (errno))
906 error("ioctl(PPPIOCSMRU): %m(%d)", errno);
909 SYSDEBUG ((LOG_DEBUG, "recv_config: asyncmap = %lx\n", asyncmap));
910 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
911 if (!ok_error(errno))
912 error("ioctl(PPPIOCSRASYNCMAP): %m(%d)", errno);
916 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
920 /********************************************************************
922 * ccp_test - ask kernel whether a given compression method
923 * is acceptable for use.
926 int ccp_test (int unit, u_char *opt_ptr, int opt_len, int for_transmit)
928 struct ppp_option_data data;
930 memset (&data, '\0', sizeof (data));
932 data.length = opt_len;
933 data.transmit = for_transmit;
935 if (ioctl(ppp_fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
938 return (errno == ENOBUFS)? 0: -1;
941 /********************************************************************
943 * ccp_flags_set - inform kernel about the current state of CCP.
946 void ccp_flags_set (int unit, int isopen, int isup)
950 x = isopen? x | SC_CCP_OPEN : x &~ SC_CCP_OPEN;
951 x = isup? x | SC_CCP_UP : x &~ SC_CCP_UP;
956 /********************************************************************
958 * get_idle_time - return how long the link has been idle.
965 return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
968 /********************************************************************
970 * get_ppp_stats - return statistics for the link.
973 get_ppp_stats(u, stats)
975 struct pppd_stats *stats;
977 struct ifpppstatsreq req;
979 memset (&req, 0, sizeof (req));
981 req.stats_ptr = (caddr_t) &req.stats;
982 strlcpy(req.ifr__name, ifname, sizeof(req.ifr__name));
983 if (ioctl(sock_fd, SIOCGPPPSTATS, &req) < 0) {
984 error("Couldn't get PPP statistics: %m");
987 stats->bytes_in = req.stats.p.ppp_ibytes;
988 stats->bytes_out = req.stats.p.ppp_obytes;
992 /********************************************************************
994 * ccp_fatal_error - returns 1 if decompression was disabled as a
995 * result of an error detected after decompression of a packet,
996 * 0 otherwise. This is necessary because of patent nonsense.
999 int ccp_fatal_error (int unit)
1001 int x = get_flags();
1003 return x & SC_DC_FERROR;
1007 * path_to_route - determine the path to the proc file system data
1009 #define ROUTE_MAX_COLS 12
1010 FILE *route_fd = (FILE *) 0;
1011 static char route_buffer [512];
1012 static int route_dev_col, route_dest_col, route_gw_col;
1013 static int route_flags_col, route_mask_col;
1014 static int route_num_cols;
1016 static char *path_to_route (void);
1017 static int open_route_table (void);
1018 static void close_route_table (void);
1019 static int read_route_table (struct rtentry *rt);
1021 /********************************************************************
1023 * path_to_procfs - find the path to the proc file system mount point
1026 static int path_to_procfs (void)
1028 struct mntent *mntent;
1031 fp = fopen(MOUNTED, "r");
1033 /* Default the mount location of /proc */
1034 strlcpy (route_buffer, "/proc", sizeof (route_buffer));
1038 while ((mntent = getmntent(fp)) != NULL) {
1039 if (strcmp(mntent->mnt_type, MNTTYPE_IGNORE) == 0)
1041 if (strcmp(mntent->mnt_type, "proc") == 0)
1048 strlcpy(route_buffer, mntent->mnt_dir, sizeof (route_buffer));
1052 /********************************************************************
1054 * path_to_route - find the path to the route tables in the proc file system
1057 static char *path_to_route (void)
1059 if (!path_to_procfs()) {
1060 error("proc file system not mounted");
1063 strlcat (route_buffer, "/net/route", sizeof(route_buffer));
1064 return (route_buffer);
1067 /********************************************************************
1069 * close_route_table - close the interface to the route table
1072 static void close_route_table (void)
1074 if (route_fd != (FILE *) 0) {
1076 route_fd = (FILE *) 0;
1080 /********************************************************************
1082 * open_route_table - open the interface to the route table
1084 static char route_delims[] = " \t\n";
1086 static int open_route_table (void)
1090 close_route_table();
1092 path = path_to_route();
1096 route_fd = fopen (path, "r");
1097 if (route_fd == NULL) {
1098 error("can't open %s: %m (%d)", path, errno);
1102 route_dev_col = 0; /* default to usual columns */
1105 route_flags_col = 3;
1109 /* parse header line */
1110 if (fgets(route_buffer, sizeof(route_buffer), route_fd) != 0) {
1111 char *p = route_buffer, *q;
1113 for (col = 0; col < ROUTE_MAX_COLS; ++col) {
1115 if ((q = strtok(p, route_delims)) == 0)
1117 if (strcasecmp(q, "iface") == 0)
1118 route_dev_col = col;
1119 else if (strcasecmp(q, "destination") == 0)
1120 route_dest_col = col;
1121 else if (strcasecmp(q, "gateway") == 0)
1123 else if (strcasecmp(q, "flags") == 0)
1124 route_flags_col = col;
1125 else if (strcasecmp(q, "mask") == 0)
1126 route_mask_col = col;
1129 if (used && col >= route_num_cols)
1130 route_num_cols = col + 1;
1138 /********************************************************************
1140 * read_route_table - read the next entry from the route table
1143 static int read_route_table(struct rtentry *rt)
1145 char *cols[ROUTE_MAX_COLS], *p;
1148 memset (rt, '\0', sizeof (struct rtentry));
1150 if (fgets (route_buffer, sizeof (route_buffer), route_fd) == (char *) 0)
1154 for (col = 0; col < route_num_cols; ++col) {
1155 cols[col] = strtok(p, route_delims);
1156 if (cols[col] == NULL)
1157 return 0; /* didn't get enough columns */
1160 ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr =
1161 strtoul(cols[route_dest_col], NULL, 16);
1163 ((struct sockaddr_in *) &rt->rt_gateway)->sin_addr.s_addr =
1164 strtoul(cols[route_gw_col], NULL, 16);
1166 ((struct sockaddr_in *) &rt->rt_genmask)->sin_addr.s_addr =
1167 strtoul(cols[route_mask_col], NULL, 16);
1169 rt->rt_flags = (short) strtoul(cols[route_flags_col], NULL, 16);
1170 rt->rt_dev = cols[route_dev_col];
1175 /********************************************************************
1177 * defaultroute_exists - determine if there is a default route
1180 static int defaultroute_exists (struct rtentry *rt)
1184 if (!open_route_table())
1187 while (read_route_table(rt) != 0) {
1188 if ((rt->rt_flags & RTF_UP) == 0)
1191 if (((struct sockaddr_in *) (&rt->rt_dst))->sin_addr.s_addr == 0L) {
1197 close_route_table();
1202 * have_route_to - determine if the system has any route to
1203 * a given IP address. `addr' is in network byte order.
1204 * Return value is 1 if yes, 0 if no, -1 if don't know.
1205 * For demand mode to work properly, we have to ignore routes
1206 * through our own interface.
1208 int have_route_to(u_int32_t addr)
1213 if (!open_route_table())
1214 return -1; /* don't know */
1216 while (read_route_table(&rt)) {
1217 if ((rt.rt_flags & RTF_UP) == 0 || strcmp(rt.rt_dev, ifname) == 0)
1219 if ((addr & ((struct sockaddr_in *)&rt.rt_genmask)->sin_addr.s_addr)
1220 == ((struct sockaddr_in *)&rt.rt_dst)->sin_addr.s_addr) {
1226 close_route_table();
1230 /********************************************************************
1232 * sifdefaultroute - assign a default route through the address given.
1235 int sifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1239 if (defaultroute_exists(&rt) && strcmp(rt.rt_dev, ifname) != 0) {
1240 struct in_addr old_gateway =
1241 ((struct sockaddr_in *) (&rt.rt_gateway))-> sin_addr;
1243 if (old_gateway.s_addr != gateway)
1244 error("not replacing existing default route to %s [%I]",
1245 rt.rt_dev, old_gateway);
1249 memset (&rt, '\0', sizeof (rt));
1250 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1251 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1253 if (kernel_version > KVERSION(2,1,0)) {
1254 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1255 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = 0L;
1258 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
1260 rt.rt_flags = RTF_UP | RTF_GATEWAY | RTF_DEFAULT;
1261 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
1262 if ( ! ok_error ( errno ))
1263 error("default route ioctl(SIOCADDRT): %m(%d)", errno);
1267 default_route_gateway = gateway;
1271 /********************************************************************
1273 * cifdefaultroute - delete a default route through the address given.
1276 int cifdefaultroute (int unit, u_int32_t ouraddr, u_int32_t gateway)
1280 default_route_gateway = 0;
1282 memset (&rt, '\0', sizeof (rt));
1283 SET_SA_FAMILY (rt.rt_dst, AF_INET);
1284 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
1286 if (kernel_version > KVERSION(2,1,0)) {
1287 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
1288 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = 0L;
1291 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = gateway;
1293 rt.rt_flags = RTF_UP | RTF_GATEWAY | RTF_DEFAULT;
1294 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
1296 if ( ! ok_error ( errno ))
1297 error("default route ioctl(SIOCDELRT): %m (%d)", errno);
1305 /********************************************************************
1307 * sifproxyarp - Make a proxy ARP entry for the peer.
1310 int sifproxyarp (int unit, u_int32_t his_adr)
1312 struct arpreq arpreq;
1314 if (has_proxy_arp == 0) {
1315 memset (&arpreq, '\0', sizeof(arpreq));
1317 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1318 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
1319 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1321 * Get the hardware address of an interface on the same subnet
1322 * as our local address.
1324 if (!get_ether_addr(his_adr, &arpreq.arp_ha, proxy_arp_dev,
1325 sizeof(proxy_arp_dev))) {
1326 error("Cannot determine ethernet address for proxy ARP");
1329 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1331 if (ioctl(sock_fd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1332 if ( ! ok_error ( errno ))
1333 error("ioctl(SIOCSARP): %m(%d)", errno);
1336 proxy_arp_addr = his_adr;
1343 /********************************************************************
1345 * cifproxyarp - Delete the proxy ARP entry for the peer.
1348 int cifproxyarp (int unit, u_int32_t his_adr)
1350 struct arpreq arpreq;
1352 if (has_proxy_arp) {
1354 memset (&arpreq, '\0', sizeof(arpreq));
1355 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1356 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = his_adr;
1357 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1358 strlcpy(arpreq.arp_dev, proxy_arp_dev, sizeof(arpreq.arp_dev));
1360 if (ioctl(sock_fd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1361 if ( ! ok_error ( errno ))
1362 warn("ioctl(SIOCDARP): %m(%d)", errno);
1369 /********************************************************************
1371 * get_ether_addr - get the hardware address of an interface on the
1372 * the same subnet as ipaddr.
1375 static int get_ether_addr (u_int32_t ipaddr,
1376 struct sockaddr *hwaddr,
1377 char *name, int namelen)
1379 struct ifreq *ifr, *ifend;
1380 u_int32_t ina, mask;
1383 struct ifreq ifs[MAX_IFS];
1385 ifc.ifc_len = sizeof(ifs);
1387 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1388 if ( ! ok_error ( errno ))
1389 error("ioctl(SIOCGIFCONF): %m(%d)", errno);
1393 SYSDEBUG ((LOG_DEBUG, "proxy arp: scanning %d interfaces for IP %s",
1394 ifc.ifc_len / sizeof(struct ifreq), ip_ntoa(ipaddr)));
1396 * Scan through looking for an interface with an Internet
1397 * address on the same subnet as `ipaddr'.
1399 ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq));
1400 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1401 if (ifr->ifr_addr.sa_family == AF_INET) {
1402 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1403 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1404 SYSDEBUG ((LOG_DEBUG, "proxy arp: examining interface %s",
1407 * Check that the interface is up, and not point-to-point
1410 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1413 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1416 * Get its netmask and check that it's on the right subnet.
1418 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1421 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1422 SYSDEBUG ((LOG_DEBUG, "proxy arp: interface addr %s mask %lx",
1423 ip_ntoa(ina), ntohl(mask)));
1425 if (((ipaddr ^ ina) & mask) != 0)
1434 strlcpy(name, ifreq.ifr_name, namelen);
1435 info("found interface %s for proxy arp", name);
1437 * Now get the hardware address.
1439 memset (&ifreq.ifr_hwaddr, 0, sizeof (struct sockaddr));
1440 if (ioctl (sock_fd, SIOCGIFHWADDR, &ifreq) < 0) {
1441 error("SIOCGIFHWADDR(%s): %m(%d)", ifreq.ifr_name, errno);
1447 sizeof (struct sockaddr));
1449 SYSDEBUG ((LOG_DEBUG,
1450 "proxy arp: found hwaddr %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
1451 (int) ((unsigned char *) &hwaddr->sa_data)[0],
1452 (int) ((unsigned char *) &hwaddr->sa_data)[1],
1453 (int) ((unsigned char *) &hwaddr->sa_data)[2],
1454 (int) ((unsigned char *) &hwaddr->sa_data)[3],
1455 (int) ((unsigned char *) &hwaddr->sa_data)[4],
1456 (int) ((unsigned char *) &hwaddr->sa_data)[5],
1457 (int) ((unsigned char *) &hwaddr->sa_data)[6],
1458 (int) ((unsigned char *) &hwaddr->sa_data)[7]));
1462 /********************************************************************
1464 * Return user specified netmask, modified by any mask we might determine
1465 * for address `addr' (in network byte order).
1466 * Here we scan through the system's list of interfaces, looking for
1467 * any non-point-to-point interfaces which might appear to be on the same
1468 * network as `addr'. If we find any, we OR in their netmask to the
1469 * user-specified netmask.
1472 u_int32_t GetMask (u_int32_t addr)
1474 u_int32_t mask, nmask, ina;
1475 struct ifreq *ifr, *ifend, ifreq;
1477 struct ifreq ifs[MAX_IFS];
1481 if (IN_CLASSA(addr)) /* determine network mask for address class */
1482 nmask = IN_CLASSA_NET;
1483 else if (IN_CLASSB(addr))
1484 nmask = IN_CLASSB_NET;
1486 nmask = IN_CLASSC_NET;
1488 /* class D nets are disallowed by bad_ip_adrs */
1489 mask = netmask | htonl(nmask);
1491 * Scan through the system's network interfaces.
1493 ifc.ifc_len = sizeof(ifs);
1495 if (ioctl(sock_fd, SIOCGIFCONF, &ifc) < 0) {
1496 if ( ! ok_error ( errno ))
1497 warn("ioctl(SIOCGIFCONF): %m(%d)", errno);
1501 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1502 for (ifr = ifc.ifc_req; ifr < ifend; ifr++) {
1504 * Check the interface's internet address.
1506 if (ifr->ifr_addr.sa_family != AF_INET)
1508 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1509 if (((ntohl(ina) ^ addr) & nmask) != 0)
1512 * Check that the interface is up, and not point-to-point nor loopback.
1514 strlcpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1515 if (ioctl(sock_fd, SIOCGIFFLAGS, &ifreq) < 0)
1518 if (((ifreq.ifr_flags ^ FLAGS_GOOD) & FLAGS_MASK) != 0)
1521 * Get its netmask and OR it into our mask.
1523 if (ioctl(sock_fd, SIOCGIFNETMASK, &ifreq) < 0)
1525 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1531 /********************************************************************
1533 * Internal routine to decode the version.modification.patch level
1536 static void decode_version (char *buf, int *version,
1537 int *modification, int *patch)
1539 *version = (int) strtoul (buf, &buf, 10);
1545 *modification = (int) strtoul (buf, &buf, 10);
1548 *patch = (int) strtoul (buf, &buf, 10);
1559 /********************************************************************
1561 * Procedure to determine if the PPP line discipline is registered.
1565 ppp_registered(void)
1573 * We used to open the serial device and set it to the ppp line
1574 * discipline here, in order to create a ppp unit. But that is
1575 * not a good idea - the user might have specified a device that
1576 * they can't open (permission, or maybe it doesn't really exist).
1577 * So we grab a pty master/slave pair and use that.
1579 if (!get_pty(&mfd, &local_fd, slave, 0)) {
1580 no_ppp_msg = "Couldn't determine if PPP is supported (no free ptys)";
1585 * Try to put the device into the PPP discipline.
1587 if (ioctl(local_fd, TIOCSETD, &ppp_disc) < 0) {
1588 error("ioctl(TIOCSETD(PPP)): %m(%d)", errno);
1597 /********************************************************************
1599 * ppp_available - check whether the system has any ppp interfaces
1600 * (in fact we check whether we can do an ioctl on ppp0).
1603 int ppp_available(void)
1608 int my_version, my_modification, my_patch;
1611 "This system lacks kernel support for PPP. This could be because\n"
1612 "the PPP kernel module is not loaded, or because the kernel is\n"
1613 "not configured for PPP. See the README.linux file in the\n"
1614 "ppp-2.3.7 distribution.\n";
1617 * Open a socket for doing the ioctl operations.
1619 s = socket(AF_INET, SOCK_DGRAM, 0);
1623 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1624 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1626 * If the device did not exist then attempt to create one by putting the
1627 * current tty into the PPP discipline. If this works then obtain the
1628 * flags for the device again.
1631 if (ppp_registered()) {
1632 strlcpy (ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
1633 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
1637 * Ensure that the hardware address is for PPP and not something else
1640 ok = ioctl (s, SIOCGIFHWADDR, (caddr_t) &ifr) >= 0;
1642 if (ok && ((ifr.ifr_hwaddr.sa_family & ~0xFF) != ARPHRD_PPP))
1646 * This is the PPP device. Validate the version of the driver at this
1647 * point to ensure that this program will work with the driver.
1650 char abBuffer [1024];
1652 ifr.ifr_data = abBuffer;
1653 size = ioctl (s, SIOCGPPPVER, (caddr_t) &ifr);
1655 error("Couldn't read driver version: %m");
1657 no_ppp_msg = "Sorry, couldn't verify kernel driver version\n";
1660 decode_version(abBuffer,
1662 &driver_modification,
1665 * Validate the version of the driver against the version that we used.
1667 decode_version(VERSION,
1672 /* The version numbers must match */
1673 if (driver_version != my_version)
1676 /* The modification levels must be legal */
1677 if (driver_modification < 3) {
1678 if (driver_modification >= 2) {
1679 /* we can cope with 2.2.0 and above */
1688 slprintf(route_buffer, sizeof(route_buffer),
1689 "Sorry - PPP driver version %d.%d.%d is out of date\n",
1690 driver_version, driver_modification, driver_patch);
1692 no_ppp_msg = route_buffer;
1699 /********************************************************************
1701 * Update the wtmp file with the appropriate user name and tty device.
1704 void logwtmp (const char *line, const char *name, const char *host)
1707 struct utmp ut, *utp;
1708 pid_t mypid = getpid();
1710 * Update the signon database for users.
1711 * Christoph Lameter: Copied from poeigl-1.36 Jan 3, 1996
1713 utmpname(_PATH_UTMP);
1715 while ((utp = getutent()) && (utp->ut_pid != mypid))
1718 /* Is this call really necessary? There is another one after the 'put' */
1722 memcpy(&ut, utp, sizeof(ut));
1724 /* some gettys/telnetds don't initialize utmp... */
1725 memset(&ut, 0, sizeof(ut));
1727 if (ut.ut_id[0] == 0)
1728 strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
1730 strncpy(ut.ut_user, name, sizeof(ut.ut_user));
1731 strncpy(ut.ut_line, line, sizeof(ut.ut_line));
1735 ut.ut_type = USER_PROCESS;
1738 /* Insert the host name if one is supplied */
1740 strncpy (ut.ut_host, host, sizeof(ut.ut_host));
1742 /* Insert the IP address of the remote system if IP is enabled */
1743 if (ipcp_protent.enabled_flag && ipcp_hisoptions[0].neg_addr)
1744 memcpy(&ut.ut_addr, (char *) &ipcp_hisoptions[0].hisaddr,
1745 sizeof(ut.ut_addr));
1747 /* CL: Makes sure that the logout works */
1748 if (*host == 0 && *name==0)
1754 * Update the wtmp file.
1756 wtmp = open(_PATH_WTMP, O_APPEND|O_WRONLY);
1758 flock(wtmp, LOCK_EX);
1760 /* we really should check for error on the write for a full disk! */
1761 write (wtmp, (char *)&ut, sizeof(ut));
1764 flock(wtmp, LOCK_UN);
1769 /********************************************************************
1770 * Code for locking/unlocking the serial device.
1771 * This code is derived from chat.c.
1775 #define LOCK_PREFIX "/var/lock/LCK.."
1778 static char *lock_file;
1781 * lock - create a lock file for the named device
1784 int lock (char *dev)
1788 lock_file = strdup(dev);
1789 if (lock_file == NULL)
1790 novm("lock file name");
1791 result = mklock (dev, (void *) 0);
1794 notice("Device %s is locked by pid %d", dev, result);
1801 error("Can't create lock file %s", lock_file);
1809 char hdb_lock_buffer[12];
1815 p = strrchr(dev, '/');
1819 l = strlen(LOCK_PREFIX) + strlen(dev) + 1;
1820 lock_file = malloc(l);
1821 if (lock_file == NULL)
1822 novm("lock file name");
1824 slprintf(lock_file, l, "%s%s", LOCK_PREFIX, dev);
1826 * Attempt to create the lock file at this point.
1829 fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644);
1833 slprintf(hdb_lock_buffer, sizeof(hdb_lock_buffer), "%010d\n", pid);
1834 write (fd, hdb_lock_buffer, 11);
1836 write(fd, &pid, sizeof (pid));
1842 * If the file exists then check to see if the pid is stale
1844 if (errno == EEXIST) {
1845 fd = open(lock_file, O_RDONLY, 0);
1847 if (errno == ENOENT) /* This is just a timing problem. */
1852 /* Read the lock file to find out who has the device locked */
1853 n = read (fd, hdb_lock_buffer, 11);
1856 error("Can't read pid from lock file %s", lock_file);
1860 /* See the process still exists. */
1863 hdb_lock_buffer[n] = '\0';
1864 sscanf (hdb_lock_buffer, " %d", &pid);
1866 pid = ((int *) hdb_lock_buffer)[0];
1868 if (pid == 0 || pid == getpid()
1869 || (kill(pid, 0) == -1 && errno == ESRCH))
1873 /* If the process does not exist then try to remove the lock */
1874 if (n == 0 && unlink (lock_file) == 0) {
1875 notice("Removed stale lock on %s (pid %d)",
1880 notice("Device %s is locked by pid %d", dev, pid);
1884 error("Can't create lock file %s: %m(%d)", lock_file, errno);
1895 /********************************************************************
1897 * unlock - remove our lockfile
1904 (void) rmlock (lock_file, (void *) 0);
1914 /********************************************************************
1916 * sifvjcomp - config tcp header compression
1919 int sifvjcomp (int u, int vjcomp, int cidcomp, int maxcid)
1921 u_int x = get_flags();
1924 if (ioctl (ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
1925 if (! ok_error (errno))
1926 error("ioctl(PPPIOCSMAXCID): %m(%d)", errno);
1931 x = vjcomp ? x | SC_COMP_TCP : x &~ SC_COMP_TCP;
1932 x = cidcomp ? x & ~SC_NO_TCP_CCID : x | SC_NO_TCP_CCID;
1938 /********************************************************************
1940 * sifup - Config the interface up and enable IP packets to pass.
1947 memset (&ifr, '\0', sizeof (ifr));
1948 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1949 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
1950 if (! ok_error (errno))
1951 error("ioctl (SIOCGIFFLAGS): %m(%d)", errno);
1955 ifr.ifr_flags |= (IFF_UP | IFF_POINTOPOINT);
1956 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
1957 if (! ok_error (errno))
1958 error("ioctl(SIOCSIFFLAGS): %m(%d)", errno);
1965 /********************************************************************
1967 * sifdown - Config the interface down and disable IP.
1976 memset (&ifr, '\0', sizeof (ifr));
1977 strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
1978 if (ioctl(sock_fd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
1979 if (! ok_error (errno))
1980 error("ioctl (SIOCGIFFLAGS): %m(%d)", errno);
1984 ifr.ifr_flags &= ~IFF_UP;
1985 ifr.ifr_flags |= IFF_POINTOPOINT;
1986 if (ioctl(sock_fd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
1987 if (! ok_error (errno))
1988 error("ioctl(SIOCSIFFLAGS): %m(%d)", errno);
1994 /********************************************************************
1996 * sifaddr - Config the interface IP addresses and netmask.
1999 int sifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr,
2005 memset (&ifr, '\0', sizeof (ifr));
2006 memset (&rt, '\0', sizeof (rt));
2008 SET_SA_FAMILY (ifr.ifr_addr, AF_INET);
2009 SET_SA_FAMILY (ifr.ifr_dstaddr, AF_INET);
2010 SET_SA_FAMILY (ifr.ifr_netmask, AF_INET);
2012 strlcpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
2014 * Set our IP address
2016 ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = our_adr;
2017 if (ioctl(sock_fd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2018 if (errno != EEXIST) {
2019 if (! ok_error (errno))
2020 error("ioctl(SIOCSIFADDR): %m(%d)", errno);
2023 warn("ioctl(SIOCSIFADDR): Address already exists");
2028 * Set the gateway address
2030 ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = his_adr;
2031 if (ioctl(sock_fd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
2032 if (! ok_error (errno))
2033 error("ioctl(SIOCSIFDSTADDR): %m(%d)", errno);
2038 * For recent kernels, force the netmask to 255.255.255.255.
2040 if (kernel_version >= KVERSION(2,1,16))
2042 if (net_mask != 0) {
2043 ((struct sockaddr_in *) &ifr.ifr_netmask)->sin_addr.s_addr = net_mask;
2044 if (ioctl(sock_fd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
2045 if (! ok_error (errno))
2046 error("ioctl(SIOCSIFNETMASK): %m(%d)", errno);
2051 * Add the device route
2053 if (kernel_version < KVERSION(2,1,16)) {
2054 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2055 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2058 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0L;
2059 ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
2060 rt.rt_flags = RTF_UP | RTF_HOST;
2062 if (kernel_version > KVERSION(2,1,0)) {
2063 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2064 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = -1L;
2067 if (ioctl(sock_fd, SIOCADDRT, &rt) < 0) {
2068 if (! ok_error (errno))
2069 error("ioctl(SIOCADDRT) device route: %m(%d)", errno);
2076 /********************************************************************
2078 * cifaddr - Clear the interface IP addresses, and delete routes
2079 * through the interface if possible.
2082 int cifaddr (int unit, u_int32_t our_adr, u_int32_t his_adr)
2086 if (kernel_version < KVERSION(2,1,16)) {
2088 * Delete the route through the device
2090 memset (&rt, '\0', sizeof (rt));
2092 SET_SA_FAMILY (rt.rt_dst, AF_INET);
2093 SET_SA_FAMILY (rt.rt_gateway, AF_INET);
2096 ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = 0;
2097 ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr = his_adr;
2098 rt.rt_flags = RTF_UP | RTF_HOST;
2100 if (kernel_version > KVERSION(2,1,0)) {
2101 SET_SA_FAMILY (rt.rt_genmask, AF_INET);
2102 ((struct sockaddr_in *) &rt.rt_genmask)->sin_addr.s_addr = -1L;
2105 if (ioctl(sock_fd, SIOCDELRT, &rt) < 0 && errno != ESRCH) {
2106 if (still_ppp() && ! ok_error (errno))
2107 error("ioctl(SIOCDELRT) device route: %m(%d)", errno);
2115 * get_pty - get a pty master/slave pair and chown the slave side
2116 * to the uid given. Assumes slave_name points to >= 12 bytes of space.
2119 get_pty(master_fdp, slave_fdp, slave_name, uid)
2127 struct termios tios;
2130 for (i = 0; i < 64; ++i) {
2131 slprintf(pty_name, sizeof(pty_name), "/dev/pty%c%x",
2132 'p' + i / 16, i % 16);
2133 mfd = open(pty_name, O_RDWR, 0);
2136 sfd = open(pty_name, O_RDWR | O_NOCTTY, 0);
2145 strlcpy(slave_name, pty_name, 12);
2148 fchown(sfd, uid, -1);
2149 fchmod(sfd, S_IRUSR | S_IWUSR);
2150 if (tcgetattr(sfd, &tios) == 0) {
2151 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
2152 tios.c_cflag |= CS8 | CREAD;
2153 tios.c_iflag = IGNPAR | CLOCAL;
2156 if (tcsetattr(sfd, TCSAFLUSH, &tios) < 0)
2157 warn("couldn't set attributes on pty: %m");
2159 warn("couldn't get attributes on pty: %m");
2164 /********************************************************************
2166 * open_loopback - open the device we use for getting packets
2167 * in demand mode. Under Linux, we use a pty master/slave pair.
2170 open_ppp_loopback(void)
2174 if (!get_pty(&master_fd, &slave_fd, loop_name, 0))
2175 fatal("No free pty for loopback");
2176 SYSDEBUG(("using %s for loopback", loop_name));
2178 set_ppp_fd(slave_fd);
2180 flags = fcntl(master_fd, F_GETFL);
2182 fcntl(master_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2183 warn("couldn't set master loopback to nonblock: %m(%d)", errno);
2185 flags = fcntl(ppp_fd, F_GETFL);
2187 fcntl(ppp_fd, F_SETFL, flags | O_NONBLOCK) == -1)
2188 warn("couldn't set slave loopback to nonblock: %m(%d)", errno);
2190 if (ioctl(ppp_fd, TIOCSETD, &ppp_disc) < 0)
2191 fatal("ioctl(TIOCSETD): %m(%d)", errno);
2193 * Find out which interface we were given.
2195 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
2196 fatal("ioctl(PPPIOCGUNIT): %m(%d)", errno);
2198 * Enable debug in the driver if requested.
2200 set_kdebugflag (kdebugflag);
2205 /********************************************************************
2207 * restore_loop - reattach the ppp unit to the loopback.
2209 * The kernel ppp driver automatically reattaches the ppp unit to
2210 * the loopback if the serial port is set to a line discipline other
2211 * than ppp, or if it detects a modem hangup. The former will happen
2212 * in disestablish_ppp if the latter hasn't already happened, so we
2213 * shouldn't need to do anything.
2215 * Just to be sure, set the real serial port to the normal discipline.
2221 if (ppp_fd != slave_fd) {
2222 (void) ioctl(ppp_fd, TIOCSETD, &tty_disc);
2223 set_ppp_fd(slave_fd);
2227 /********************************************************************
2229 * sifnpmode - Set the mode for handling packets for a given NP.
2233 sifnpmode(u, proto, mode)
2240 npi.protocol = proto;
2242 if (ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
2243 if (! ok_error (errno)) {
2244 error("ioctl(PPPIOCSNPMODE, %d, %d): %m (%d)",
2245 proto, mode, errno);
2246 error("ppp_fd=%d slave_fd=%d\n", ppp_fd, slave_fd);
2254 /********************************************************************
2256 * sipxfaddr - Config the interface IPX networknumber
2259 int sipxfaddr (int unit, unsigned long int network, unsigned char * node )
2266 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2268 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2270 if (! ok_error (errno))
2271 dbglog("socket(AF_IPX): %m (%d)", errno);
2275 memset (&ifr, '\0', sizeof (ifr));
2276 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2278 memcpy (sipx->sipx_node, node, IPX_NODE_LEN);
2279 sipx->sipx_family = AF_IPX;
2280 sipx->sipx_port = 0;
2281 sipx->sipx_network = htonl (network);
2282 sipx->sipx_type = IPX_FRAME_ETHERII;
2283 sipx->sipx_action = IPX_CRTITF;
2285 * Set the IPX device
2287 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2289 if (errno != EEXIST) {
2290 if (! ok_error (errno))
2291 dbglog("ioctl(SIOCSIFADDR, CRTITF): %m (%d)", errno);
2294 warn("ioctl(SIOCSIFADDR, CRTITF): Address already exists");
2303 /********************************************************************
2305 * cipxfaddr - Clear the information for the IPX network. The IPX routes
2306 * are removed and the device is no longer able to pass IPX
2310 int cipxfaddr (int unit)
2317 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *) &ifr.ifr_addr;
2319 skfd = socket (AF_IPX, SOCK_DGRAM, 0);
2321 if (! ok_error (errno))
2322 dbglog("socket(AF_IPX): %m (%d)", errno);
2326 memset (&ifr, '\0', sizeof (ifr));
2327 strlcpy (ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
2329 sipx->sipx_type = IPX_FRAME_ETHERII;
2330 sipx->sipx_action = IPX_DLTITF;
2331 sipx->sipx_family = AF_IPX;
2333 * Set the IPX device
2335 if (ioctl(skfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
2336 if (! ok_error (errno))
2337 info("ioctl(SIOCSIFADDR, IPX_DLTITF): %m (%d)", errno);
2348 * daemon - Detach us from controlling terminal session.
2351 daemon(nochdir, noclose)
2352 int nochdir, noclose;
2356 if ((pid = fork()) < 0)
2359 exit(0); /* parent dies */
2364 fclose(stdin); /* don't need stdin, stdout, stderr */
2373 * Use the hostname as part of the random number seed.
2382 for (p = hostname; *p != 0; ++p)
2387 /********************************************************************
2389 * sys_check_options - check the options that the user specified
2393 sys_check_options(void)
2396 struct stat stat_buf;
2398 * Disable the IPX protocol if the support is not present in the kernel.
2399 * If we disable it then ensure that IP support is enabled.
2401 while (ipxcp_protent.enabled_flag) {
2402 if (path_to_procfs()) {
2403 strlcat (route_buffer, "/net/ipx_interface", sizeof(route_buffer));
2404 if (lstat (route_buffer, &stat_buf) >= 0)
2407 error("IPX support is not present in the kernel\n");
2408 ipxcp_protent.enabled_flag = 0;
2409 ipcp_protent.enabled_flag = 1;
2413 if (demand && driver_is_old) {
2414 option_error("demand dialling is not supported by kernel driver "
2415 "version %d.%d.%d", driver_version, driver_modification,