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 1.37 1999/03/16 02:57:06 paulus Exp $";
25 /* $NetBSD: sys-bsd.c,v 1.1.1.3 1997/09/26 18:53:04 christos Exp $ */
40 #include <sys/ioctl.h>
41 #include <sys/types.h>
42 #include <sys/socket.h>
45 #include <sys/param.h>
54 #include <net/ppp_defs.h>
55 #include <net/if_ppp.h>
56 #include <net/route.h>
57 #include <net/if_dl.h>
58 #include <netinet/in.h>
61 #include <sys/param.h>
62 #if defined(NetBSD) && (NetBSD >= 199703)
63 #include <netinet/if_inarp.h>
64 #else /* NetBSD 1.2D or later */
66 #include <netinet/if_ether.h>
68 #include <net/if_ether.h>
77 static int initdisc = -1; /* Initial TTY discipline for ppp_fd */
78 static int initfdflags = -1; /* Initial file descriptor flags for ppp_fd */
79 static int ppp_fd = -1; /* fd which is set to PPP discipline */
82 static int restore_term; /* 1 => we've munged the terminal */
83 static struct termios inittermios; /* Initial TTY termios */
84 static struct winsize wsinfo; /* Initial window size info */
86 static char *lock_file; /* name of lock file created */
88 static int loop_slave = -1;
89 static int loop_master;
90 static char loop_name[20];
92 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
94 static int sockfd; /* socket for doing interface ioctls */
96 static fd_set in_fds; /* set of fds that wait_input waits for */
97 static int max_in_fd; /* highest fd set in in_fds */
99 static int if_is_up; /* the interface is currently up */
100 static u_int32_t ifaddrs[2]; /* local and remote addresses we set */
101 static u_int32_t default_route_gateway; /* gateway addr for default route */
102 static u_int32_t proxy_arp_addr; /* remote addr for proxy arp */
104 /* Prototypes for procedures local to this file. */
105 static int dodefaultroute __P((u_int32_t, int));
106 static int get_ether_addr __P((u_int32_t, struct sockaddr_dl *));
110 * sys_init - System-dependent initialization.
115 /* Get an internet socket for doing socket ioctl's on. */
116 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
117 fatal("Couldn't create IP socket: %m");
124 * sys_cleanup - restore any system state we modified before exiting:
125 * mark the interface down, delete default route and/or proxy arp entry.
126 * This should call die() because it's called from die().
134 strlcpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
135 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0
136 && ((ifr.ifr_flags & IFF_UP) != 0)) {
137 ifr.ifr_flags &= ~IFF_UP;
138 ioctl(sockfd, SIOCSIFFLAGS, &ifr);
142 cifaddr(0, ifaddrs[0], ifaddrs[1]);
143 if (default_route_gateway)
144 cifdefaultroute(0, 0, default_route_gateway);
146 cifproxyarp(0, proxy_arp_addr);
150 * sys_close - Clean up in a child process before execing.
156 if (loop_slave >= 0) {
163 * sys_check_options - check the options that the user specified
170 warn("DTR/CTS flow control is not supported on this system");
178 * ppp_available - check whether the system has any ppp interfaces
179 * (in fact we check whether we can do an ioctl on ppp0).
186 extern char *no_ppp_msg;
188 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
189 return 1; /* can't tell */
191 strlcpy(ifr.ifr_name, sizeof (ifr.ifr_name), "ppp0");
192 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
196 This system lacks kernel support for PPP. To include PPP support\n\
197 in the kernel, please follow the steps detailed in the README.bsd\n\
198 file in the ppp-2.2 distribution.\n";
203 * establish_ppp - Turn the serial port into a ppp interface.
209 int pppdisc = PPPDISC;
214 * Demand mode - prime the old ppp device to relinquish the unit.
216 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0)
217 fatal("ioctl(transfer ppp unit): %m");
221 * Save the old line discipline of fd, and set it to PPP.
223 if (ioctl(fd, TIOCGETD, &initdisc) < 0)
224 fatal("ioctl(TIOCGETD): %m");
225 if (ioctl(fd, TIOCSETD, &pppdisc) < 0)
226 fatal("ioctl(TIOCSETD): %m");
230 * Find out which interface we were given.
232 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
233 fatal("ioctl(PPPIOCGUNIT): %m");
236 * Check that we got the same unit again.
238 if (ioctl(fd, PPPIOCGUNIT, &x) < 0) {
239 fatal("ioctl(PPPIOCGUNIT): %m");
241 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
243 ioctl(loop_slave, TIOCSETD, &x);
249 * Enable debug in the driver if requested.
252 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
253 warn("ioctl (PPPIOCGFLAGS): %m");
255 x |= (kdebugflag & 0xFF) * SC_DEBUG;
256 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
257 warn("ioctl(PPPIOCSFLAGS): %m");
262 * Set device for non-blocking reads.
264 if ((initfdflags = fcntl(fd, F_GETFL)) == -1
265 || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
266 warn("Couldn't set device to non-blocking mode: %m");
271 * restore_loop - reattach the ppp unit to the loopback.
279 * Transfer the ppp interface back to the loopback.
281 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0)
282 fatal("ioctl(transfer ppp unit): %m");
284 if (ioctl(loop_slave, TIOCSETD, &x) < 0)
285 fatal("ioctl(TIOCSETD): %m");
288 * Check that we got the same unit again.
290 if (ioctl(loop_slave, PPPIOCGUNIT, &x) < 0)
291 fatal("ioctl(PPPIOCGUNIT): %m");
293 fatal("transfer_ppp failed: wanted unit %d, got %d", ifunit, x);
299 * disestablish_ppp - Restore the serial port to normal operation.
300 * This shouldn't call die() because it's called from die().
306 /* Reset non-blocking mode on fd. */
307 if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
308 warn("Couldn't restore device fd flags: %m");
311 /* Restore old line discipline. */
312 if (initdisc >= 0 && ioctl(fd, TIOCSETD, &initdisc) < 0)
313 error("ioctl(TIOCSETD): %m");
321 * Check whether the link seems not to be 8-bit clean.
329 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
331 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
333 s = "bit 7 set to 1";
336 s = "bit 7 set to 0";
346 warn("Serial link is not 8-bit clean:");
347 warn("All received characters had %s", s);
353 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
354 * at the requested speed, etc. If `local' is true, set CLOCAL
355 * regardless of whether the modem option was specified.
357 * For *BSD, we assume that speed_t values numerically equal bits/second.
360 set_up_tty(fd, local)
365 if (tcgetattr(fd, &tios) < 0)
366 fatal("tcgetattr: %m");
370 ioctl(fd, TIOCGWINSZ, &wsinfo);
373 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
374 if (crtscts > 0 && !local) {
377 tios.c_cflag |= CDTRCTS;
380 tios.c_cflag |= CRTSCTS;
381 } else if (crtscts < 0) {
382 tios.c_cflag &= ~CRTSCTS;
384 tios.c_cflag &= ~CDTRCTS;
388 tios.c_cflag |= CS8 | CREAD | HUPCL;
390 tios.c_cflag |= CLOCAL;
391 tios.c_iflag = IGNBRK | IGNPAR;
395 tios.c_cc[VTIME] = 0;
398 tios.c_iflag |= IXON | IXOFF;
399 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
400 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
404 cfsetospeed(&tios, inspeed);
405 cfsetispeed(&tios, inspeed);
407 inspeed = cfgetospeed(&tios);
409 * We can't proceed if the serial port speed is 0,
410 * since that implies that the serial port is disabled.
413 fatal("Baud rate for %s is 0; need explicit baud rate", devnam);
417 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0)
418 fatal("tcsetattr: %m");
424 * restore_tty - restore the terminal to the saved settings.
431 if (!default_device) {
433 * Turn off echoing, because otherwise we can get into
434 * a loop with the tty and the modem echoing to each other.
435 * We presume we are the sole user of this tty device, so
436 * when we close it, it will revert to its defaults anyway.
438 inittermios.c_lflag &= ~(ECHO | ECHONL);
440 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
442 warn("tcsetattr: %m");
443 ioctl(fd, TIOCSWINSZ, &wsinfo);
449 * setdtr - control the DTR line on the serial port.
450 * This is called from die(), so it shouldn't call die().
456 int modembits = TIOCM_DTR;
458 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
463 * open_ppp_loopback - open the device we use for getting
464 * packets in demand mode, and connect it to a ppp interface.
472 int pppdisc = PPPDISC;
474 if (openpty(&loop_master, &loop_slave, loop_name, NULL, NULL) < 0)
475 fatal("No free pty for loopback");
476 SYSDEBUG(("using %s for loopback", loop_name));
478 if (tcgetattr(loop_slave, &tios) == 0) {
479 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
480 tios.c_cflag |= CS8 | CREAD;
481 tios.c_iflag = IGNPAR;
484 if (tcsetattr(loop_slave, TCSAFLUSH, &tios) < 0)
485 warn("couldn't set attributes on loopback: %m");
488 if ((flags = fcntl(loop_master, F_GETFL)) != -1)
489 if (fcntl(loop_master, F_SETFL, flags | O_NONBLOCK) == -1)
490 warn("couldn't set loopback to nonblock: %m");
493 if (ioctl(ppp_fd, TIOCSETD, &pppdisc) < 0)
494 fatal("ioctl(TIOCSETD): %m");
497 * Find out which interface we were given.
499 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0)
500 fatal("ioctl(PPPIOCGUNIT): %m");
503 * Enable debug in the driver if requested.
506 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
507 warn("ioctl (PPPIOCGFLAGS): %m");
509 flags |= (kdebugflag & 0xFF) * SC_DEBUG;
510 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
511 warn("ioctl(PPPIOCSFLAGS): %m");
519 * output - Output PPP packet.
528 dbglog("sent %P", p, len);
530 if (write(ttyfd, p, len) < 0) {
538 * wait_input - wait until there is data available,
539 * for the length of time specified by *timo (indefinite
544 struct timeval *timo;
550 n = select(max_in_fd + 1, &ready, NULL, &ready, timo);
551 if (n < 0 && errno != EINTR)
557 * add_fd - add an fd to the set that wait_input waits for.
567 * remove_fd - remove an fd from the set that wait_input waits for.
569 void remove_fd(int fd)
576 * wait_loop_output - wait until there is data available on the
577 * loopback, for the length of time specified by *timo (indefinite
581 wait_loop_output(timo)
582 struct timeval *timo;
588 FD_SET(loop_master, &ready);
589 n = select(loop_master + 1, &ready, NULL, &ready, timo);
590 if (n < 0 && errno != EINTR)
596 * wait_time - wait for a given length of time or until a
597 * signal is received.
601 struct timeval *timo;
605 n = select(0, NULL, NULL, NULL, timo);
606 if (n < 0 && errno != EINTR)
613 * read_packet - get a PPP packet from the serial device.
621 if ((len = read(ttyfd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
622 if (errno == EWOULDBLOCK || errno == EINTR)
631 * get_loop_output - read characters from the loopback, form them
632 * into frames, and detect when we want to bring the real link up.
633 * Return value is 1 if we need to bring up the link, 0 otherwise.
641 while ((n = read(loop_master, inbuf, sizeof(inbuf))) >= 0) {
642 if (loop_chars(inbuf, n))
647 fatal("eof on loopback");
648 if (errno != EWOULDBLOCK)
649 fatal("read from loopback: %m");
656 * ppp_send_config - configure the transmit characteristics of
660 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
668 strlcpy(ifr.ifr_name, sizeof (ifr.ifr_name), ifname);
670 if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0)
671 fatal("ioctl(SIOCSIFMTU): %m");
673 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0)
674 fatal("ioctl(PPPIOCSASYNCMAP): %m");
676 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0)
677 fatal("ioctl (PPPIOCGFLAGS): %m");
678 x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
679 x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
680 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
681 fatal("ioctl(PPPIOCSFLAGS): %m");
686 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
689 ppp_set_xaccm(unit, accm)
693 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
694 warn("ioctl(set extended ACCM): %m");
699 * ppp_recv_config - configure the receive-side characteristics of
703 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
710 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0)
711 fatal("ioctl(PPPIOCSMRU): %m");
712 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0)
713 fatal("ioctl(PPPIOCSRASYNCMAP): %m");
714 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0)
715 fatal("ioctl (PPPIOCGFLAGS): %m");
716 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
717 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
718 fatal("ioctl(PPPIOCSFLAGS): %m");
722 * ccp_test - ask kernel whether a given compression method
723 * is acceptable for use. Returns 1 if the method and parameters
724 * are OK, 0 if the method is known but the parameters are not OK
725 * (e.g. code size should be reduced), or -1 if the method is unknown.
728 ccp_test(unit, opt_ptr, opt_len, for_transmit)
729 int unit, opt_len, for_transmit;
732 struct ppp_option_data data;
735 data.length = opt_len;
736 data.transmit = for_transmit;
737 if (ioctl(ttyfd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
739 return (errno == ENOBUFS)? 0: -1;
743 * ccp_flags_set - inform kernel about the current state of CCP.
746 ccp_flags_set(unit, isopen, isup)
747 int unit, isopen, isup;
751 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
752 error("ioctl (PPPIOCGFLAGS): %m");
755 x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
756 x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
757 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
758 error("ioctl(PPPIOCSFLAGS): %m");
762 * ccp_fatal_error - returns 1 if decompression was disabled as a
763 * result of an error detected after decompression of a packet,
764 * 0 otherwise. This is necessary because of patent nonsense.
767 ccp_fatal_error(unit)
772 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
773 error("ioctl(PPPIOCGFLAGS): %m");
776 return x & SC_DC_FERROR;
780 * get_idle_time - return how long the link has been idle.
787 return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
793 * set_filters - transfer the pass and active filters to the kernel.
796 set_filters(pass, active)
797 struct bpf_program *pass, *active;
801 if (pass->bf_len > 0) {
802 if (ioctl(ppp_fd, PPPIOCSPASS, pass) < 0) {
803 error("Couldn't set pass-filter in kernel: %m");
807 if (active->bf_len > 0) {
808 if (ioctl(ppp_fd, PPPIOCSACTIVE, active) < 0) {
809 error("Couldn't set active-filter in kernel: %m");
818 * sifvjcomp - config tcp header compression
821 sifvjcomp(u, vjcomp, cidcomp, maxcid)
822 int u, vjcomp, cidcomp, maxcid;
826 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
827 error("ioctl (PPPIOCGFLAGS): %m");
830 x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
831 x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
832 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
833 error("ioctl(PPPIOCSFLAGS): %m");
836 if (vjcomp && ioctl(ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
837 error("ioctl(PPPIOCSFLAGS): %m");
844 * sifup - Config the interface up and enable IP packets to pass.
852 strlcpy(ifr.ifr_name, sizeof (ifr.ifr_name), ifname);
853 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
854 error("ioctl (SIOCGIFFLAGS): %m");
857 ifr.ifr_flags |= IFF_UP;
858 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
859 error("ioctl(SIOCSIFFLAGS): %m");
867 * sifnpmode - Set the mode for handling packets for a given NP.
870 sifnpmode(u, proto, mode)
877 npi.protocol = proto;
879 if (ioctl(ppp_fd, PPPIOCSNPMODE, &npi) < 0) {
880 error("ioctl(set NP %d mode to %d): %m", proto, mode);
887 * sifdown - Config the interface down and disable IP.
898 npi.protocol = PPP_IP;
899 npi.mode = NPMODE_ERROR;
900 ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi);
901 /* ignore errors, because ppp_fd might have been closed by now. */
903 strlcpy(ifr.ifr_name, sizeof (ifr.ifr_name), ifname);
904 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
905 error("ioctl (SIOCGIFFLAGS): %m");
908 ifr.ifr_flags &= ~IFF_UP;
909 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
910 error("ioctl(SIOCSIFFLAGS): %m");
919 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
922 #define SET_SA_FAMILY(addr, family) \
923 BZERO((char *) &(addr), sizeof(addr)); \
924 addr.sa_family = (family); \
925 addr.sa_len = sizeof(addr);
928 * sifaddr - Config the interface IP addresses and netmask.
935 struct ifaliasreq ifra;
938 strlcpy(ifra.ifra_name, sizeof(ifra.ifra_name), ifname);
939 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
940 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
941 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
942 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
944 SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
945 ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
947 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
948 BZERO(&ifr, sizeof(ifr));
949 strlcpy(ifr.ifr_name, sizeof(ifr.ifr_name), ifname);
950 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifr) < 0) {
951 if (errno != EADDRNOTAVAIL)
952 warn("Couldn't remove interface address: %m");
954 if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
955 if (errno != EEXIST) {
956 error("Couldn't set interface address: %m");
959 warn("Couldn't set interface address: Address %I already exists", o);
967 * cifaddr - Clear the interface IP addresses, and delete routes
968 * through the interface if possible.
975 struct ifaliasreq ifra;
978 strlcpy(ifra.ifra_name, sizeof(ifra.ifra_name), ifname);
979 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
980 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
981 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
982 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
983 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
984 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
985 if (errno != EADDRNOTAVAIL)
986 warn("Couldn't delete interface address: %m");
993 * sifdefaultroute - assign a default route through the address given.
996 sifdefaultroute(u, l, g)
1000 return dodefaultroute(g, 's');
1004 * cifdefaultroute - delete a default route through the address given.
1007 cifdefaultroute(u, l, g)
1011 return dodefaultroute(g, 'c');
1015 * dodefaultroute - talk to a routing socket to add/delete a default route.
1018 dodefaultroute(g, cmd)
1024 struct rt_msghdr hdr;
1025 struct sockaddr_in dst;
1026 struct sockaddr_in gway;
1027 struct sockaddr_in mask;
1030 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1031 error("Couldn't %s default route: socket: %m",
1032 cmd=='s'? "add": "delete");
1036 memset(&rtmsg, 0, sizeof(rtmsg));
1037 rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
1038 rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
1039 rtmsg.hdr.rtm_version = RTM_VERSION;
1040 rtmsg.hdr.rtm_seq = ++rtm_seq;
1041 rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
1042 rtmsg.dst.sin_len = sizeof(rtmsg.dst);
1043 rtmsg.dst.sin_family = AF_INET;
1044 rtmsg.gway.sin_len = sizeof(rtmsg.gway);
1045 rtmsg.gway.sin_family = AF_INET;
1046 rtmsg.gway.sin_addr.s_addr = g;
1047 rtmsg.mask.sin_len = sizeof(rtmsg.dst);
1048 rtmsg.mask.sin_family = AF_INET;
1050 rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
1051 if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
1052 error("Couldn't %s default route: %m",
1053 cmd=='s'? "add": "delete");
1059 default_route_gateway = (cmd == 's')? g: 0;
1063 #if RTM_VERSION >= 3
1066 * sifproxyarp - Make a proxy ARP entry for the peer.
1069 struct rt_msghdr hdr;
1070 struct sockaddr_inarp dst;
1071 struct sockaddr_dl hwa;
1075 static int arpmsg_valid;
1078 sifproxyarp(unit, hisaddr)
1085 * Get the hardware address of an interface on the same subnet
1086 * as our local address.
1088 memset(&arpmsg, 0, sizeof(arpmsg));
1089 if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
1090 error("Cannot determine ethernet address for proxy ARP");
1094 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1095 error("Couldn't add proxy arp entry: socket: %m");
1099 arpmsg.hdr.rtm_type = RTM_ADD;
1100 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
1101 arpmsg.hdr.rtm_version = RTM_VERSION;
1102 arpmsg.hdr.rtm_seq = ++rtm_seq;
1103 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
1104 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
1105 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
1106 arpmsg.dst.sin_family = AF_INET;
1107 arpmsg.dst.sin_addr.s_addr = hisaddr;
1108 arpmsg.dst.sin_other = SIN_PROXY;
1110 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
1111 + arpmsg.hwa.sdl_len;
1112 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1113 error("Couldn't add proxy arp entry: %m");
1120 proxy_arp_addr = hisaddr;
1125 * cifproxyarp - Delete the proxy ARP entry for the peer.
1128 cifproxyarp(unit, hisaddr)
1138 arpmsg.hdr.rtm_type = RTM_DELETE;
1139 arpmsg.hdr.rtm_seq = ++rtm_seq;
1141 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1142 error("Couldn't delete proxy arp entry: socket: %m");
1146 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1147 error("Couldn't delete proxy arp entry: %m");
1157 #else /* RTM_VERSION */
1160 * sifproxyarp - Make a proxy ARP entry for the peer.
1163 sifproxyarp(unit, hisaddr)
1167 struct arpreq arpreq;
1169 struct sockaddr_dl sdl;
1173 BZERO(&arpreq, sizeof(arpreq));
1176 * Get the hardware address of an interface on the same subnet
1177 * as our local address.
1179 if (!get_ether_addr(hisaddr, &dls.sdl)) {
1180 error("Cannot determine ethernet address for proxy ARP");
1184 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
1185 arpreq.arp_ha.sa_family = AF_UNSPEC;
1186 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
1187 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1188 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1189 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1190 if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1191 error("Couldn't add proxy arp entry: %m");
1195 proxy_arp_addr = hisaddr;
1200 * cifproxyarp - Delete the proxy ARP entry for the peer.
1203 cifproxyarp(unit, hisaddr)
1207 struct arpreq arpreq;
1209 BZERO(&arpreq, sizeof(arpreq));
1210 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1211 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1212 if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1213 warn("Couldn't delete proxy arp entry: %m");
1219 #endif /* RTM_VERSION */
1223 * get_ether_addr - get the hardware address of an interface on the
1224 * the same subnet as ipaddr.
1229 get_ether_addr(ipaddr, hwaddr)
1231 struct sockaddr_dl *hwaddr;
1233 struct ifreq *ifr, *ifend, *ifp;
1234 u_int32_t ina, mask;
1235 struct sockaddr_dl *dla;
1238 struct ifreq ifs[MAX_IFS];
1240 ifc.ifc_len = sizeof(ifs);
1242 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1243 error("ioctl(SIOCGIFCONF): %m");
1248 * Scan through looking for an interface with an Internet
1249 * address on the same subnet as `ipaddr'.
1251 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1252 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1253 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1254 if (ifr->ifr_addr.sa_family == AF_INET) {
1255 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1256 strlcpy(ifreq.ifr_name, sizeof(ifreq.ifr_name), ifr->ifr_name);
1258 * Check that the interface is up, and not point-to-point
1261 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1263 if ((ifreq.ifr_flags &
1264 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
1265 != (IFF_UP|IFF_BROADCAST))
1268 * Get its netmask and check that it's on the right subnet.
1270 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1272 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1273 if ((ipaddr & mask) != (ina & mask))
1282 info("found interface %s for proxy arp", ifr->ifr_name);
1285 * Now scan through again looking for a link-level address
1286 * for this interface.
1289 for (ifr = ifc.ifc_req; ifr < ifend; ) {
1290 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
1291 && ifr->ifr_addr.sa_family == AF_LINK) {
1293 * Found the link-level address - copy it out
1295 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
1296 BCOPY(dla, hwaddr, dla->sdl_len);
1299 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
1306 * Return user specified netmask, modified by any mask we might determine
1307 * for address `addr' (in network byte order).
1308 * Here we scan through the system's list of interfaces, looking for
1309 * any non-point-to-point interfaces which might appear to be on the same
1310 * network as `addr'. If we find any, we OR in their netmask to the
1311 * user-specified netmask.
1317 u_int32_t mask, nmask, ina;
1318 struct ifreq *ifr, *ifend, ifreq;
1320 struct ifreq ifs[MAX_IFS];
1323 if (IN_CLASSA(addr)) /* determine network mask for address class */
1324 nmask = IN_CLASSA_NET;
1325 else if (IN_CLASSB(addr))
1326 nmask = IN_CLASSB_NET;
1328 nmask = IN_CLASSC_NET;
1329 /* class D nets are disallowed by bad_ip_adrs */
1330 mask = netmask | htonl(nmask);
1333 * Scan through the system's network interfaces.
1335 ifc.ifc_len = sizeof(ifs);
1337 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1338 warn("ioctl(SIOCGIFCONF): %m");
1341 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1342 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1343 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1345 * Check the interface's internet address.
1347 if (ifr->ifr_addr.sa_family != AF_INET)
1349 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1350 if ((ntohl(ina) & nmask) != (addr & nmask))
1353 * Check that the interface is up, and not point-to-point or loopback.
1355 strlcpy(ifreq.ifr_name, sizeof(ifreq.ifr_name), ifr->ifr_name);
1356 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1358 if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
1362 * Get its netmask and OR it into our mask.
1364 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1366 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1373 * have_route_to - determine if the system has any route to
1374 * a given IP address.
1375 * For demand mode to work properly, we have to ignore routes
1376 * through our own interface.
1378 int have_route_to(u_int32_t addr)
1384 * Use the hostid as part of the random number seed.
1393 * lock - create a lock file for the named lock device
1395 #define LOCK_PREFIX "/var/spool/lock/LCK.."
1401 char hdb_lock_buffer[12];
1406 if ((p = strrchr(dev, '/')) != NULL)
1408 l = strlen(LOCK_PREFIX) + strlen(dev) + 1;
1409 lock_file = malloc(l);
1410 if (lock_file == NULL)
1411 novm("lock file name");
1412 slprintf(lock_file, l, "%s%s", LOCK_PREFIX, dev);
1414 while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
1416 && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
1417 /* Read the lock file to find out who has the device locked */
1418 n = read(fd, hdb_lock_buffer, 11);
1420 error("Can't read pid from lock file %s", lock_file);
1423 hdb_lock_buffer[n] = 0;
1424 pid = atoi(hdb_lock_buffer);
1425 if (kill(pid, 0) == -1 && errno == ESRCH) {
1426 /* pid no longer exists - remove the lock file */
1427 if (unlink(lock_file) == 0) {
1429 notice("Removed stale lock on %s (pid %d)",
1433 warn("Couldn't remove stale lock on %s",
1436 notice("Device %s is locked by pid %d",
1441 error("Can't create lock file %s: %m", lock_file);
1447 slprintf(hdb_lock_buffer, sizeof(hdb_lock_buffer), "%10d\n", getpid());
1448 write(fd, hdb_lock_buffer, 11);
1455 * unlock - remove our lockfile