2 * sys-bsd.c - System-dependent procedures for setting up
3 * PPP interfaces on bsd-4.4-ish systems (including 386BSD, NetBSD, etc.)
5 * Copyright (c) 1989 Carnegie Mellon University.
6 * Copyright (c) 1995 The Australian National University.
9 * Redistribution and use in source and binary forms are permitted
10 * provided that the above copyright notice and this paragraph are
11 * duplicated in all such forms and that any documentation,
12 * advertising materials, and other materials related to such
13 * distribution and use acknowledge that the software was developed
14 * by Carnegie Mellon University and The Australian National University.
15 * The names of the Universities may not be used to endorse or promote
16 * products derived from this software without specific prior written
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
20 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
24 static char rcsid[] = "$Id: sys-bsd.c,v 1.26 1996/07/01 05:32:37 paulus Exp $";
40 #include <sys/ioctl.h>
41 #include <sys/types.h>
42 #include <sys/socket.h>
47 #include <net/ppp_defs.h>
48 #include <net/if_ppp.h>
49 #include <net/route.h>
50 #include <net/if_dl.h>
51 #include <netinet/in.h>
54 #include <netinet/if_ether.h>
59 static int initdisc = -1; /* Initial TTY discipline for ppp_fd */
60 static int initfdflags = -1; /* Initial file descriptor flags for ppp_fd */
61 static int ppp_fd = -1; /* fd which is set to PPP discipline */
64 static int restore_term; /* 1 => we've munged the terminal */
65 static struct termios inittermios; /* Initial TTY termios */
66 static struct winsize wsinfo; /* Initial window size info */
68 static char *lock_file; /* name of lock file created */
70 static int loop_slave = -1;
71 static int loop_master;
72 static char loop_name[20];
74 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
76 static int sockfd; /* socket for doing interface ioctls */
78 static int if_is_up; /* the interface is currently up */
79 static u_int32_t ifaddrs[2]; /* local and remote addresses we set */
80 static u_int32_t default_route_gateway; /* gateway addr for default route */
81 static u_int32_t proxy_arp_addr; /* remote addr for proxy arp */
83 /* Prototypes for procedures local to this file. */
84 static int dodefaultroute __P((u_int32_t, int));
85 static int get_ether_addr __P((u_int32_t, struct sockaddr_dl *));
89 * sys_init - System-dependent initialization.
94 /* Get an internet socket for doing socket ioctl's on. */
95 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
96 syslog(LOG_ERR, "Couldn't create IP socket: %m");
102 * sys_cleanup - restore any system state we modified before exiting:
103 * mark the interface down, delete default route and/or proxy arp entry.
104 * This should call die() because it's called from die().
112 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
113 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0
114 && ((ifr.ifr_flags & IFF_UP) != 0)) {
115 ifr.ifr_flags &= ~IFF_UP;
116 ioctl(sockfd, SIOCSIFFLAGS, &ifr);
120 cifaddr(0, ifaddrs[0], ifaddrs[1]);
121 if (default_route_gateway)
122 cifdefaultroute(0, default_route_gateway);
124 cifproxyarp(0, proxy_arp_addr);
128 * sys_close - Clean up in a child process before execing.
134 if (loop_slave >= 0) {
141 * sys_check_options - check the options that the user specified
150 * ppp_available - check whether the system has any ppp interfaces
151 * (in fact we check whether we can do an ioctl on ppp0).
158 extern char *no_ppp_msg;
160 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
161 return 1; /* can't tell */
163 strncpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
164 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
168 This system lacks kernel support for PPP. To include PPP support\n\
169 in the kernel, please follow the steps detailed in the README.bsd\n\
170 file in the ppp-2.2 distribution.\n";
175 * establish_ppp - Turn the serial port into a ppp interface.
181 int pppdisc = PPPDISC;
186 * Demand mode - prime the old ppp device to relinquish the unit.
188 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0) {
189 syslog(LOG_ERR, "ioctl(transfer ppp unit): %m");
195 * Save the old line discipline of fd, and set it to PPP.
197 if (ioctl(fd, TIOCGETD, &initdisc) < 0) {
198 syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
201 if (ioctl(fd, TIOCSETD, &pppdisc) < 0) {
202 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
208 * Find out which interface we were given.
210 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
211 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
216 * Check that we got the same unit again.
218 if (ioctl(fd, PPPIOCGUNIT, &x) < 0) {
219 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
223 syslog(LOG_ERR, "transfer_ppp failed: wanted unit %d, got %d",
228 ioctl(loop_slave, TIOCSETD, &x);
234 * Enable debug in the driver if requested.
237 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
238 syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m");
240 x |= (kdebugflag & 0xFF) * SC_DEBUG;
241 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
242 syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
247 * Set device for non-blocking reads.
249 if ((initfdflags = fcntl(fd, F_GETFL)) == -1
250 || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
251 syslog(LOG_WARNING, "Couldn't set device to non-blocking mode: %m");
256 * restore_loop - reattach the ppp unit to the loopback.
264 * Transfer the ppp interface back to the loopback.
266 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0) {
267 syslog(LOG_ERR, "ioctl(transfer ppp unit): %m");
271 if (ioctl(loop_slave, TIOCSETD, &x) < 0) {
272 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
277 * Check that we got the same unit again.
279 if (ioctl(loop_slave, PPPIOCGUNIT, &x) < 0) {
280 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
284 syslog(LOG_ERR, "transfer_ppp failed: wanted unit %d, got %d",
293 * disestablish_ppp - Restore the serial port to normal operation.
294 * This shouldn't call die() because it's called from die().
300 /* Reset non-blocking mode on fd. */
301 if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
302 syslog(LOG_WARNING, "Couldn't restore device fd flags: %m");
305 /* Restore old line discipline. */
306 if (initdisc >= 0 && ioctl(fd, TIOCSETD, &initdisc) < 0)
307 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
315 * Check whether the link seems not to be 8-bit clean.
323 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
325 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
327 s = "bit 7 set to 1";
330 s = "bit 7 set to 0";
340 syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
341 syslog(LOG_WARNING, "All received characters had %s", s);
347 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
348 * at the requested speed, etc. If `local' is true, set CLOCAL
349 * regardless of whether the modem option was specified.
351 * For *BSD, we assume that speed_t values numerically equal bits/second.
354 set_up_tty(fd, local)
359 if (tcgetattr(fd, &tios) < 0) {
360 syslog(LOG_ERR, "tcgetattr: %m");
366 ioctl(fd, TIOCGWINSZ, &wsinfo);
369 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
370 if (crtscts > 0 && !local)
371 tios.c_cflag |= CRTSCTS;
372 else if (crtscts < 0)
373 tios.c_cflag &= ~CRTSCTS;
375 tios.c_cflag |= CS8 | CREAD | HUPCL;
377 tios.c_cflag |= CLOCAL;
378 tios.c_iflag = IGNBRK | IGNPAR;
382 tios.c_cc[VTIME] = 0;
385 tios.c_iflag |= IXON | IXOFF;
386 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
387 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
391 cfsetospeed(&tios, inspeed);
392 cfsetispeed(&tios, inspeed);
394 inspeed = cfgetospeed(&tios);
396 * We can't proceed if the serial port speed is 0,
397 * since that implies that the serial port is disabled.
400 syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
407 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
408 syslog(LOG_ERR, "tcsetattr: %m");
416 * restore_tty - restore the terminal to the saved settings.
423 if (!default_device) {
425 * Turn off echoing, because otherwise we can get into
426 * a loop with the tty and the modem echoing to each other.
427 * We presume we are the sole user of this tty device, so
428 * when we close it, it will revert to its defaults anyway.
430 inittermios.c_lflag &= ~(ECHO | ECHONL);
432 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
434 syslog(LOG_WARNING, "tcsetattr: %m");
435 ioctl(fd, TIOCSWINSZ, &wsinfo);
441 * setdtr - control the DTR line on the serial port.
442 * This is called from die(), so it shouldn't call die().
448 int modembits = TIOCM_DTR;
450 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
455 * open_ppp_loopback - open the device we use for getting
456 * packets in demand mode, and connect it to a ppp interface.
464 int pppdisc = PPPDISC;
466 if (openpty(&loop_master, &loop_slave, loop_name, NULL, NULL) < 0) {
467 syslog(LOG_ERR, "No free pty for loopback");
470 SYSDEBUG((LOG_DEBUG, "using %s for loopback", loop_name));
472 if (tcgetattr(loop_slave, &tios) == 0) {
473 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
474 tios.c_cflag |= CS8 | CREAD;
475 tios.c_iflag = IGNPAR;
478 if (tcsetattr(loop_slave, TCSAFLUSH, &tios) < 0)
479 syslog(LOG_WARNING, "couldn't set attributes on loopback: %m");
482 if ((flags = fcntl(loop_master, F_GETFL)) != -1)
483 if (fcntl(loop_master, F_SETFL, flags | O_NONBLOCK) == -1)
484 syslog(LOG_WARNING, "couldn't set loopback to nonblock: %m");
487 if (ioctl(ppp_fd, TIOCSETD, &pppdisc) < 0) {
488 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
493 * Find out which interface we were given.
495 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0) {
496 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
501 * Enable debug in the driver if requested.
504 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
505 syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m");
507 flags |= (kdebugflag & 0xFF) * SC_DEBUG;
508 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
509 syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
517 * output - Output PPP packet.
526 log_packet(p, len, "sent ");
528 if (write(ttyfd, p, len) < 0) {
530 syslog(LOG_ERR, "write: %m");
536 * wait_input - wait until there is data available on ttyfd,
537 * for the length of time specified by *timo (indefinite
542 struct timeval *timo;
548 FD_SET(ttyfd, &ready);
549 n = select(ttyfd+1, &ready, NULL, &ready, timo);
550 if (n < 0 && errno != EINTR) {
551 syslog(LOG_ERR, "select: %m");
558 * wait_loop_output - wait until there is data available on the
559 * loopback, for the length of time specified by *timo (indefinite
563 wait_loop_output(timo)
564 struct timeval *timo;
570 FD_SET(loop_master, &ready);
571 n = select(loop_master + 1, &ready, NULL, &ready, timo);
572 if (n < 0 && errno != EINTR) {
573 syslog(LOG_ERR, "select: %m");
580 * wait_time - wait for a given length of time or until a
581 * signal is received.
585 struct timeval *timo;
589 n = select(0, NULL, NULL, NULL, timo);
590 if (n < 0 && errno != EINTR) {
591 syslog(LOG_ERR, "select: %m");
598 * read_packet - get a PPP packet from the serial device.
606 if ((len = read(ttyfd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
607 if (errno == EWOULDBLOCK || errno == EINTR)
609 syslog(LOG_ERR, "read: %m");
617 * get_loop_output - read characters from the loopback, form them
618 * into frames, and detect when we want to bring the real link up.
619 * Return value is 1 if we need to bring up the link, 0 otherwise.
627 while ((n = read(loop_master, inbuf, sizeof(inbuf))) >= 0) {
628 if (loop_chars(inbuf, n))
633 syslog(LOG_ERR, "eof on loopback");
635 } else if (errno != EWOULDBLOCK){
636 syslog(LOG_ERR, "read from loopback: %m");
645 * ppp_send_config - configure the transmit characteristics of
649 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
657 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
659 if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
660 syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
664 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
665 syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
669 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
670 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
673 x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
674 x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
675 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
676 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
683 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
686 ppp_set_xaccm(unit, accm)
690 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
691 syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
696 * ppp_recv_config - configure the receive-side characteristics of
700 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
707 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
708 syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
711 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
712 syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
715 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
716 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
719 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
720 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
721 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
727 * ccp_test - ask kernel whether a given compression method
728 * is acceptable for use. Returns 1 if the method and parameters
729 * are OK, 0 if the method is known but the parameters are not OK
730 * (e.g. code size should be reduced), or -1 if the method is unknown.
733 ccp_test(unit, opt_ptr, opt_len, for_transmit)
734 int unit, opt_len, for_transmit;
737 struct ppp_option_data data;
740 data.length = opt_len;
741 data.transmit = for_transmit;
742 if (ioctl(ttyfd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
744 return (errno == ENOBUFS)? 0: -1;
748 * ccp_flags_set - inform kernel about the current state of CCP.
751 ccp_flags_set(unit, isopen, isup)
752 int unit, isopen, isup;
756 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
757 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
760 x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
761 x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
762 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
763 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
767 * ccp_fatal_error - returns 1 if decompression was disabled as a
768 * result of an error detected after decompression of a packet,
769 * 0 otherwise. This is necessary because of patent nonsense.
772 ccp_fatal_error(unit)
777 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
778 syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
781 return x & SC_DC_FERROR;
785 * get_idle_time - return how long the link has been idle.
792 return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
797 * sifvjcomp - config tcp header compression
800 sifvjcomp(u, vjcomp, cidcomp, maxcid)
801 int u, vjcomp, cidcomp, maxcid;
805 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
806 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
809 x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
810 x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
811 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
812 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
815 if (vjcomp && ioctl(ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
816 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
823 * sifup - Config the interface up and enable IP packets to pass.
831 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
832 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
833 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
836 ifr.ifr_flags |= IFF_UP;
837 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
838 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
846 * sifnpmode - Set the mode for handling packets for a given NP.
849 sifnpmode(u, proto, mode)
856 npi.protocol = proto;
858 if (ioctl(ppp_fd, PPPIOCSNPMODE, &npi) < 0) {
859 syslog(LOG_ERR, "ioctl(set NP %d mode to %d): %m", proto, mode);
866 * sifdown - Config the interface down and disable IP.
877 npi.protocol = PPP_IP;
878 npi.mode = NPMODE_ERROR;
879 ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi);
880 /* ignore errors, because ppp_fd might have been closed by now. */
882 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
883 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
884 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
887 ifr.ifr_flags &= ~IFF_UP;
888 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
889 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
898 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
901 #define SET_SA_FAMILY(addr, family) \
902 BZERO((char *) &(addr), sizeof(addr)); \
903 addr.sa_family = (family); \
904 addr.sa_len = sizeof(addr);
907 * sifaddr - Config the interface IP addresses and netmask.
914 struct ifaliasreq ifra;
916 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
917 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
918 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
919 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
920 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
922 SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
923 ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
925 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
926 if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
927 if (errno != EEXIST) {
928 syslog(LOG_ERR, "Couldn't set interface address: %m");
932 "Couldn't set interface address: Address already exists");
940 * cifaddr - Clear the interface IP addresses, and delete routes
941 * through the interface if possible.
948 struct ifaliasreq ifra;
951 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
952 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
953 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
954 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
955 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
956 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
957 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
958 if (errno != EADDRNOTAVAIL)
959 syslog(LOG_WARNING, "Couldn't delete interface address: %m");
966 * sifdefaultroute - assign a default route through the address given.
969 sifdefaultroute(u, g)
973 return dodefaultroute(g, 's');
977 * cifdefaultroute - delete a default route through the address given.
980 cifdefaultroute(u, g)
984 return dodefaultroute(g, 'c');
988 * dodefaultroute - talk to a routing socket to add/delete a default route.
991 dodefaultroute(g, cmd)
997 struct rt_msghdr hdr;
998 struct sockaddr_in dst;
999 struct sockaddr_in gway;
1000 struct sockaddr_in mask;
1003 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1004 syslog(LOG_ERR, "Couldn't %s default route: socket: %m",
1005 cmd=='s'? "add": "delete");
1009 memset(&rtmsg, 0, sizeof(rtmsg));
1010 rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
1011 rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY;
1012 rtmsg.hdr.rtm_version = RTM_VERSION;
1013 rtmsg.hdr.rtm_seq = ++rtm_seq;
1014 rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
1015 rtmsg.dst.sin_len = sizeof(rtmsg.dst);
1016 rtmsg.dst.sin_family = AF_INET;
1017 rtmsg.gway.sin_len = sizeof(rtmsg.gway);
1018 rtmsg.gway.sin_family = AF_INET;
1019 rtmsg.gway.sin_addr.s_addr = g;
1020 rtmsg.mask.sin_len = sizeof(rtmsg.dst);
1021 rtmsg.mask.sin_family = AF_INET;
1023 rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
1024 if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
1025 syslog(LOG_ERR, "Couldn't %s default route: %m",
1026 cmd=='s'? "add": "delete");
1032 default_route_gateway = (cmd == 's')? g: 0;
1036 #if RTM_VERSION >= 3
1039 * sifproxyarp - Make a proxy ARP entry for the peer.
1042 struct rt_msghdr hdr;
1043 struct sockaddr_inarp dst;
1044 struct sockaddr_dl hwa;
1048 static int arpmsg_valid;
1051 sifproxyarp(unit, hisaddr)
1058 * Get the hardware address of an interface on the same subnet
1059 * as our local address.
1061 memset(&arpmsg, 0, sizeof(arpmsg));
1062 if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
1063 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
1067 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1068 syslog(LOG_ERR, "Couldn't add proxy arp entry: socket: %m");
1072 arpmsg.hdr.rtm_type = RTM_ADD;
1073 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
1074 arpmsg.hdr.rtm_version = RTM_VERSION;
1075 arpmsg.hdr.rtm_seq = ++rtm_seq;
1076 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
1077 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
1078 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
1079 arpmsg.dst.sin_family = AF_INET;
1080 arpmsg.dst.sin_addr.s_addr = hisaddr;
1081 arpmsg.dst.sin_other = SIN_PROXY;
1083 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
1084 + arpmsg.hwa.sdl_len;
1085 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1086 syslog(LOG_ERR, "Couldn't add proxy arp entry: %m");
1093 proxy_arp_addr = hisaddr;
1098 * cifproxyarp - Delete the proxy ARP entry for the peer.
1101 cifproxyarp(unit, hisaddr)
1111 arpmsg.hdr.rtm_type = RTM_DELETE;
1112 arpmsg.hdr.rtm_seq = ++rtm_seq;
1114 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1115 syslog(LOG_ERR, "Couldn't delete proxy arp entry: socket: %m");
1119 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1120 syslog(LOG_ERR, "Couldn't delete proxy arp entry: %m");
1130 #else /* RTM_VERSION */
1133 * sifproxyarp - Make a proxy ARP entry for the peer.
1136 sifproxyarp(unit, hisaddr)
1140 struct arpreq arpreq;
1142 struct sockaddr_dl sdl;
1146 BZERO(&arpreq, sizeof(arpreq));
1149 * Get the hardware address of an interface on the same subnet
1150 * as our local address.
1152 if (!get_ether_addr(hisaddr, &dls.sdl)) {
1153 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
1157 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
1158 arpreq.arp_ha.sa_family = AF_UNSPEC;
1159 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
1160 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1161 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1162 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1163 if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1164 syslog(LOG_ERR, "Couldn't add proxy arp entry: %m");
1168 proxy_arp_addr = hisaddr;
1173 * cifproxyarp - Delete the proxy ARP entry for the peer.
1176 cifproxyarp(unit, hisaddr)
1180 struct arpreq arpreq;
1182 BZERO(&arpreq, sizeof(arpreq));
1183 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1184 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1185 if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1186 syslog(LOG_WARNING, "Couldn't delete proxy arp entry: %m");
1192 #endif /* RTM_VERSION */
1196 * get_ether_addr - get the hardware address of an interface on the
1197 * the same subnet as ipaddr.
1202 get_ether_addr(ipaddr, hwaddr)
1204 struct sockaddr_dl *hwaddr;
1206 struct ifreq *ifr, *ifend, *ifp;
1207 u_int32_t ina, mask;
1208 struct sockaddr_dl *dla;
1211 struct ifreq ifs[MAX_IFS];
1213 ifc.ifc_len = sizeof(ifs);
1215 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1216 syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
1221 * Scan through looking for an interface with an Internet
1222 * address on the same subnet as `ipaddr'.
1224 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1225 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1226 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1227 if (ifr->ifr_addr.sa_family == AF_INET) {
1228 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1229 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1231 * Check that the interface is up, and not point-to-point
1234 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1236 if ((ifreq.ifr_flags &
1237 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
1238 != (IFF_UP|IFF_BROADCAST))
1241 * Get its netmask and check that it's on the right subnet.
1243 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1245 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1246 if ((ipaddr & mask) != (ina & mask))
1255 syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name);
1258 * Now scan through again looking for a link-level address
1259 * for this interface.
1262 for (ifr = ifc.ifc_req; ifr < ifend; ) {
1263 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
1264 && ifr->ifr_addr.sa_family == AF_LINK) {
1266 * Found the link-level address - copy it out
1268 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
1269 BCOPY(dla, hwaddr, dla->sdl_len);
1272 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
1279 * Return user specified netmask, modified by any mask we might determine
1280 * for address `addr' (in network byte order).
1281 * Here we scan through the system's list of interfaces, looking for
1282 * any non-point-to-point interfaces which might appear to be on the same
1283 * network as `addr'. If we find any, we OR in their netmask to the
1284 * user-specified netmask.
1290 u_int32_t mask, nmask, ina;
1291 struct ifreq *ifr, *ifend, ifreq;
1293 struct ifreq ifs[MAX_IFS];
1296 if (IN_CLASSA(addr)) /* determine network mask for address class */
1297 nmask = IN_CLASSA_NET;
1298 else if (IN_CLASSB(addr))
1299 nmask = IN_CLASSB_NET;
1301 nmask = IN_CLASSC_NET;
1302 /* class D nets are disallowed by bad_ip_adrs */
1303 mask = netmask | htonl(nmask);
1306 * Scan through the system's network interfaces.
1308 ifc.ifc_len = sizeof(ifs);
1310 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1311 syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m");
1314 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1315 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1316 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1318 * Check the interface's internet address.
1320 if (ifr->ifr_addr.sa_family != AF_INET)
1322 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1323 if ((ntohl(ina) & nmask) != (addr & nmask))
1326 * Check that the interface is up, and not point-to-point or loopback.
1328 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1329 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1331 if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
1335 * Get its netmask and OR it into our mask.
1337 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1339 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1346 * lock - create a lock file for the named lock device
1348 #define LOCK_PREFIX "/var/spool/lock/LCK.."
1354 char hdb_lock_buffer[12];
1358 if ((p = strrchr(dev, '/')) != NULL)
1360 lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1);
1361 if (lock_file == NULL)
1362 novm("lock file name");
1363 strcat(strcpy(lock_file, LOCK_PREFIX), dev);
1365 while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
1367 && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
1368 /* Read the lock file to find out who has the device locked */
1369 n = read(fd, hdb_lock_buffer, 11);
1371 syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
1374 hdb_lock_buffer[n] = 0;
1375 pid = atoi(hdb_lock_buffer);
1376 if (kill(pid, 0) == -1 && errno == ESRCH) {
1377 /* pid no longer exists - remove the lock file */
1378 if (unlink(lock_file) == 0) {
1380 syslog(LOG_NOTICE, "Removed stale lock on %s (pid %d)",
1384 syslog(LOG_WARNING, "Couldn't remove stale lock on %s",
1387 syslog(LOG_NOTICE, "Device %s is locked by pid %d",
1392 syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file);
1398 sprintf(hdb_lock_buffer, "%10d\n", getpid());
1399 write(fd, hdb_lock_buffer, 11);
1406 * unlock - remove our lockfile