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 1.29 1997/11/27 06:10:04 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 */
65 #include <net/if_ether.h>
73 static int initdisc = -1; /* Initial TTY discipline for ppp_fd */
74 static int initfdflags = -1; /* Initial file descriptor flags for ppp_fd */
75 static int ppp_fd = -1; /* fd which is set to PPP discipline */
78 static int restore_term; /* 1 => we've munged the terminal */
79 static struct termios inittermios; /* Initial TTY termios */
80 static struct winsize wsinfo; /* Initial window size info */
82 static char *lock_file; /* name of lock file created */
84 static int loop_slave = -1;
85 static int loop_master;
86 static char loop_name[20];
88 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
90 static int sockfd; /* socket for doing interface ioctls */
92 static int if_is_up; /* the interface is currently up */
93 static u_int32_t ifaddrs[2]; /* local and remote addresses we set */
94 static u_int32_t default_route_gateway; /* gateway addr for default route */
95 static u_int32_t proxy_arp_addr; /* remote addr for proxy arp */
97 /* Prototypes for procedures local to this file. */
98 static int dodefaultroute __P((u_int32_t, int));
99 static int get_ether_addr __P((u_int32_t, struct sockaddr_dl *));
103 * sys_init - System-dependent initialization.
108 /* Get an internet socket for doing socket ioctl's on. */
109 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
110 syslog(LOG_ERR, "Couldn't create IP socket: %m");
116 * sys_cleanup - restore any system state we modified before exiting:
117 * mark the interface down, delete default route and/or proxy arp entry.
118 * This should call die() because it's called from die().
126 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
127 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0
128 && ((ifr.ifr_flags & IFF_UP) != 0)) {
129 ifr.ifr_flags &= ~IFF_UP;
130 ioctl(sockfd, SIOCSIFFLAGS, &ifr);
134 cifaddr(0, ifaddrs[0], ifaddrs[1]);
135 if (default_route_gateway)
136 cifdefaultroute(0, 0, default_route_gateway);
138 cifproxyarp(0, proxy_arp_addr);
142 * sys_close - Clean up in a child process before execing.
148 if (loop_slave >= 0) {
155 * sys_check_options - check the options that the user specified
163 * ppp_available - check whether the system has any ppp interfaces
164 * (in fact we check whether we can do an ioctl on ppp0).
171 extern char *no_ppp_msg;
173 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
174 return 1; /* can't tell */
176 strncpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
177 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
181 This system lacks kernel support for PPP. To include PPP support\n\
182 in the kernel, please follow the steps detailed in the README.bsd\n\
183 file in the ppp-2.2 distribution.\n";
188 * establish_ppp - Turn the serial port into a ppp interface.
194 int pppdisc = PPPDISC;
199 * Demand mode - prime the old ppp device to relinquish the unit.
201 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0) {
202 syslog(LOG_ERR, "ioctl(transfer ppp unit): %m");
208 * Save the old line discipline of fd, and set it to PPP.
210 if (ioctl(fd, TIOCGETD, &initdisc) < 0) {
211 syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
214 if (ioctl(fd, TIOCSETD, &pppdisc) < 0) {
215 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
221 * Find out which interface we were given.
223 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
224 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
229 * Check that we got the same unit again.
231 if (ioctl(fd, PPPIOCGUNIT, &x) < 0) {
232 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
236 syslog(LOG_ERR, "transfer_ppp failed: wanted unit %d, got %d",
241 ioctl(loop_slave, TIOCSETD, &x);
247 * Enable debug in the driver if requested.
250 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
251 syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m");
253 x |= (kdebugflag & 0xFF) * SC_DEBUG;
254 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
255 syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
260 * Set device for non-blocking reads.
262 if ((initfdflags = fcntl(fd, F_GETFL)) == -1
263 || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
264 syslog(LOG_WARNING, "Couldn't set device to non-blocking mode: %m");
269 * restore_loop - reattach the ppp unit to the loopback.
277 * Transfer the ppp interface back to the loopback.
279 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0) {
280 syslog(LOG_ERR, "ioctl(transfer ppp unit): %m");
284 if (ioctl(loop_slave, TIOCSETD, &x) < 0) {
285 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
290 * Check that we got the same unit again.
292 if (ioctl(loop_slave, PPPIOCGUNIT, &x) < 0) {
293 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
297 syslog(LOG_ERR, "transfer_ppp failed: wanted unit %d, got %d",
306 * disestablish_ppp - Restore the serial port to normal operation.
307 * This shouldn't call die() because it's called from die().
313 /* Reset non-blocking mode on fd. */
314 if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
315 syslog(LOG_WARNING, "Couldn't restore device fd flags: %m");
318 /* Restore old line discipline. */
319 if (initdisc >= 0 && ioctl(fd, TIOCSETD, &initdisc) < 0)
320 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
328 * Check whether the link seems not to be 8-bit clean.
336 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
338 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
340 s = "bit 7 set to 1";
343 s = "bit 7 set to 0";
353 syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
354 syslog(LOG_WARNING, "All received characters had %s", s);
360 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
361 * at the requested speed, etc. If `local' is true, set CLOCAL
362 * regardless of whether the modem option was specified.
364 * For *BSD, we assume that speed_t values numerically equal bits/second.
367 set_up_tty(fd, local)
372 if (tcgetattr(fd, &tios) < 0) {
373 syslog(LOG_ERR, "tcgetattr: %m");
379 ioctl(fd, TIOCGWINSZ, &wsinfo);
382 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
383 if (crtscts > 0 && !local)
384 tios.c_cflag |= CRTSCTS;
385 else if (crtscts < 0)
386 tios.c_cflag &= ~CRTSCTS;
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 syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
420 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
421 syslog(LOG_ERR, "tcsetattr: %m");
429 * restore_tty - restore the terminal to the saved settings.
436 if (!default_device) {
438 * Turn off echoing, because otherwise we can get into
439 * a loop with the tty and the modem echoing to each other.
440 * We presume we are the sole user of this tty device, so
441 * when we close it, it will revert to its defaults anyway.
443 inittermios.c_lflag &= ~(ECHO | ECHONL);
445 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
447 syslog(LOG_WARNING, "tcsetattr: %m");
448 ioctl(fd, TIOCSWINSZ, &wsinfo);
454 * setdtr - control the DTR line on the serial port.
455 * This is called from die(), so it shouldn't call die().
461 int modembits = TIOCM_DTR;
463 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
468 * open_ppp_loopback - open the device we use for getting
469 * packets in demand mode, and connect it to a ppp interface.
477 int pppdisc = PPPDISC;
479 if (openpty(&loop_master, &loop_slave, loop_name, NULL, NULL) < 0) {
480 syslog(LOG_ERR, "No free pty for loopback");
483 SYSDEBUG((LOG_DEBUG, "using %s for loopback", loop_name));
485 if (tcgetattr(loop_slave, &tios) == 0) {
486 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
487 tios.c_cflag |= CS8 | CREAD;
488 tios.c_iflag = IGNPAR;
491 if (tcsetattr(loop_slave, TCSAFLUSH, &tios) < 0)
492 syslog(LOG_WARNING, "couldn't set attributes on loopback: %m");
495 if ((flags = fcntl(loop_master, F_GETFL)) != -1)
496 if (fcntl(loop_master, F_SETFL, flags | O_NONBLOCK) == -1)
497 syslog(LOG_WARNING, "couldn't set loopback to nonblock: %m");
500 if (ioctl(ppp_fd, TIOCSETD, &pppdisc) < 0) {
501 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
506 * Find out which interface we were given.
508 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0) {
509 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
514 * Enable debug in the driver if requested.
517 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
518 syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m");
520 flags |= (kdebugflag & 0xFF) * SC_DEBUG;
521 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
522 syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
530 * output - Output PPP packet.
539 log_packet(p, len, "sent ", LOG_DEBUG);
541 if (write(ttyfd, p, len) < 0) {
543 syslog(LOG_ERR, "write: %m");
549 * wait_input - wait until there is data available on ttyfd,
550 * for the length of time specified by *timo (indefinite
555 struct timeval *timo;
561 FD_SET(ttyfd, &ready);
562 n = select(ttyfd+1, &ready, NULL, &ready, timo);
563 if (n < 0 && errno != EINTR) {
564 syslog(LOG_ERR, "select: %m");
571 * wait_loop_output - wait until there is data available on the
572 * loopback, for the length of time specified by *timo (indefinite
576 wait_loop_output(timo)
577 struct timeval *timo;
583 FD_SET(loop_master, &ready);
584 n = select(loop_master + 1, &ready, NULL, &ready, timo);
585 if (n < 0 && errno != EINTR) {
586 syslog(LOG_ERR, "select: %m");
593 * wait_time - wait for a given length of time or until a
594 * signal is received.
598 struct timeval *timo;
602 n = select(0, NULL, NULL, NULL, timo);
603 if (n < 0 && errno != EINTR) {
604 syslog(LOG_ERR, "select: %m");
611 * read_packet - get a PPP packet from the serial device.
619 if ((len = read(ttyfd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
620 if (errno == EWOULDBLOCK || errno == EINTR)
622 syslog(LOG_ERR, "read: %m");
630 * get_loop_output - read characters from the loopback, form them
631 * into frames, and detect when we want to bring the real link up.
632 * Return value is 1 if we need to bring up the link, 0 otherwise.
640 while ((n = read(loop_master, inbuf, sizeof(inbuf))) >= 0) {
641 if (loop_chars(inbuf, n))
646 syslog(LOG_ERR, "eof on loopback");
648 } else if (errno != EWOULDBLOCK){
649 syslog(LOG_ERR, "read from loopback: %m");
658 * ppp_send_config - configure the transmit characteristics of
662 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
670 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
672 if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
673 syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
677 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
678 syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
682 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
683 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
686 x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
687 x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
688 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
689 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
696 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
699 ppp_set_xaccm(unit, accm)
703 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
704 syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
709 * ppp_recv_config - configure the receive-side characteristics of
713 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
720 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
721 syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
724 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
725 syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
728 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
729 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
732 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
733 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
734 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
740 * ccp_test - ask kernel whether a given compression method
741 * is acceptable for use. Returns 1 if the method and parameters
742 * are OK, 0 if the method is known but the parameters are not OK
743 * (e.g. code size should be reduced), or -1 if the method is unknown.
746 ccp_test(unit, opt_ptr, opt_len, for_transmit)
747 int unit, opt_len, for_transmit;
750 struct ppp_option_data data;
753 data.length = opt_len;
754 data.transmit = for_transmit;
755 if (ioctl(ttyfd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
757 return (errno == ENOBUFS)? 0: -1;
761 * ccp_flags_set - inform kernel about the current state of CCP.
764 ccp_flags_set(unit, isopen, isup)
765 int unit, isopen, isup;
769 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
770 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
773 x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
774 x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
775 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
776 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
780 * ccp_fatal_error - returns 1 if decompression was disabled as a
781 * result of an error detected after decompression of a packet,
782 * 0 otherwise. This is necessary because of patent nonsense.
785 ccp_fatal_error(unit)
790 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
791 syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
794 return x & SC_DC_FERROR;
798 * get_idle_time - return how long the link has been idle.
805 return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
811 * set_filters - transfer the pass and active filters to the kernel.
814 set_filters(pass, active)
815 struct bpf_program *pass, *active;
819 if (pass->bf_len > 0) {
820 if (ioctl(ppp_fd, PPPIOCSPASS, pass) < 0) {
821 syslog(LOG_ERR, "Couldn't set pass-filter in kernel: %m");
825 if (active->bf_len > 0) {
826 if (ioctl(ppp_fd, PPPIOCSACTIVE, active) < 0) {
827 syslog(LOG_ERR, "Couldn't set active-filter in kernel: %m");
836 * sifvjcomp - config tcp header compression
839 sifvjcomp(u, vjcomp, cidcomp, maxcid)
840 int u, vjcomp, cidcomp, maxcid;
844 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
845 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
848 x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
849 x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
850 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
851 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
854 if (vjcomp && ioctl(ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
855 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
862 * sifup - Config the interface up and enable IP packets to pass.
870 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
871 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
872 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
875 ifr.ifr_flags |= IFF_UP;
876 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
877 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
885 * sifnpmode - Set the mode for handling packets for a given NP.
888 sifnpmode(u, proto, mode)
895 npi.protocol = proto;
897 if (ioctl(ppp_fd, PPPIOCSNPMODE, &npi) < 0) {
898 syslog(LOG_ERR, "ioctl(set NP %d mode to %d): %m", proto, mode);
905 * sifdown - Config the interface down and disable IP.
916 npi.protocol = PPP_IP;
917 npi.mode = NPMODE_ERROR;
918 ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi);
919 /* ignore errors, because ppp_fd might have been closed by now. */
921 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
922 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
923 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
926 ifr.ifr_flags &= ~IFF_UP;
927 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
928 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
937 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
940 #define SET_SA_FAMILY(addr, family) \
941 BZERO((char *) &(addr), sizeof(addr)); \
942 addr.sa_family = (family); \
943 addr.sa_len = sizeof(addr);
946 * sifaddr - Config the interface IP addresses and netmask.
953 struct ifaliasreq ifra;
956 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
957 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
958 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
959 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
960 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
962 SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
963 ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
965 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
966 BZERO(&ifr, sizeof(ifr));
967 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
968 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifr) < 0) {
969 if (errno != EADDRNOTAVAIL)
970 syslog(LOG_WARNING, "Couldn't remove interface address: %m");
972 if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
973 if (errno != EEXIST) {
974 syslog(LOG_ERR, "Couldn't set interface address: %m");
978 "Couldn't set interface address: Address %s already exists",
987 * cifaddr - Clear the interface IP addresses, and delete routes
988 * through the interface if possible.
995 struct ifaliasreq ifra;
998 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
999 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
1000 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
1001 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
1002 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
1003 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
1004 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
1005 if (errno != EADDRNOTAVAIL)
1006 syslog(LOG_WARNING, "Couldn't delete interface address: %m");
1013 * sifdefaultroute - assign a default route through the address given.
1016 sifdefaultroute(u, l, g)
1020 return dodefaultroute(g, 's');
1024 * cifdefaultroute - delete a default route through the address given.
1027 cifdefaultroute(u, l, g)
1031 return dodefaultroute(g, 'c');
1035 * dodefaultroute - talk to a routing socket to add/delete a default route.
1038 dodefaultroute(g, cmd)
1044 struct rt_msghdr hdr;
1045 struct sockaddr_in dst;
1046 struct sockaddr_in gway;
1047 struct sockaddr_in mask;
1050 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1051 syslog(LOG_ERR, "Couldn't %s default route: socket: %m",
1052 cmd=='s'? "add": "delete");
1056 memset(&rtmsg, 0, sizeof(rtmsg));
1057 rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
1058 rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY;
1059 rtmsg.hdr.rtm_version = RTM_VERSION;
1060 rtmsg.hdr.rtm_seq = ++rtm_seq;
1061 rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
1062 rtmsg.dst.sin_len = sizeof(rtmsg.dst);
1063 rtmsg.dst.sin_family = AF_INET;
1064 rtmsg.gway.sin_len = sizeof(rtmsg.gway);
1065 rtmsg.gway.sin_family = AF_INET;
1066 rtmsg.gway.sin_addr.s_addr = g;
1067 rtmsg.mask.sin_len = sizeof(rtmsg.dst);
1068 rtmsg.mask.sin_family = AF_INET;
1070 rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
1071 if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
1072 syslog(LOG_ERR, "Couldn't %s default route: %m",
1073 cmd=='s'? "add": "delete");
1079 default_route_gateway = (cmd == 's')? g: 0;
1083 #if RTM_VERSION >= 3
1086 * sifproxyarp - Make a proxy ARP entry for the peer.
1089 struct rt_msghdr hdr;
1090 struct sockaddr_inarp dst;
1091 struct sockaddr_dl hwa;
1095 static int arpmsg_valid;
1098 sifproxyarp(unit, hisaddr)
1105 * Get the hardware address of an interface on the same subnet
1106 * as our local address.
1108 memset(&arpmsg, 0, sizeof(arpmsg));
1109 if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
1110 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
1114 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1115 syslog(LOG_ERR, "Couldn't add proxy arp entry: socket: %m");
1119 arpmsg.hdr.rtm_type = RTM_ADD;
1120 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
1121 arpmsg.hdr.rtm_version = RTM_VERSION;
1122 arpmsg.hdr.rtm_seq = ++rtm_seq;
1123 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
1124 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
1125 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
1126 arpmsg.dst.sin_family = AF_INET;
1127 arpmsg.dst.sin_addr.s_addr = hisaddr;
1128 arpmsg.dst.sin_other = SIN_PROXY;
1130 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
1131 + arpmsg.hwa.sdl_len;
1132 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1133 syslog(LOG_ERR, "Couldn't add proxy arp entry: %m");
1140 proxy_arp_addr = hisaddr;
1145 * cifproxyarp - Delete the proxy ARP entry for the peer.
1148 cifproxyarp(unit, hisaddr)
1158 arpmsg.hdr.rtm_type = RTM_DELETE;
1159 arpmsg.hdr.rtm_seq = ++rtm_seq;
1161 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1162 syslog(LOG_ERR, "Couldn't delete proxy arp entry: socket: %m");
1166 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1167 syslog(LOG_ERR, "Couldn't delete proxy arp entry: %m");
1177 #else /* RTM_VERSION */
1180 * sifproxyarp - Make a proxy ARP entry for the peer.
1183 sifproxyarp(unit, hisaddr)
1187 struct arpreq arpreq;
1189 struct sockaddr_dl sdl;
1193 BZERO(&arpreq, sizeof(arpreq));
1196 * Get the hardware address of an interface on the same subnet
1197 * as our local address.
1199 if (!get_ether_addr(hisaddr, &dls.sdl)) {
1200 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
1204 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
1205 arpreq.arp_ha.sa_family = AF_UNSPEC;
1206 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
1207 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1208 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1209 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1210 if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1211 syslog(LOG_ERR, "Couldn't add proxy arp entry: %m");
1215 proxy_arp_addr = hisaddr;
1220 * cifproxyarp - Delete the proxy ARP entry for the peer.
1223 cifproxyarp(unit, hisaddr)
1227 struct arpreq arpreq;
1229 BZERO(&arpreq, sizeof(arpreq));
1230 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1231 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1232 if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1233 syslog(LOG_WARNING, "Couldn't delete proxy arp entry: %m");
1239 #endif /* RTM_VERSION */
1243 * get_ether_addr - get the hardware address of an interface on the
1244 * the same subnet as ipaddr.
1249 get_ether_addr(ipaddr, hwaddr)
1251 struct sockaddr_dl *hwaddr;
1253 struct ifreq *ifr, *ifend, *ifp;
1254 u_int32_t ina, mask;
1255 struct sockaddr_dl *dla;
1258 struct ifreq ifs[MAX_IFS];
1260 ifc.ifc_len = sizeof(ifs);
1262 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1263 syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
1268 * Scan through looking for an interface with an Internet
1269 * address on the same subnet as `ipaddr'.
1271 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1272 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1273 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1274 if (ifr->ifr_addr.sa_family == AF_INET) {
1275 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1276 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1278 * Check that the interface is up, and not point-to-point
1281 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1283 if ((ifreq.ifr_flags &
1284 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
1285 != (IFF_UP|IFF_BROADCAST))
1288 * Get its netmask and check that it's on the right subnet.
1290 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1292 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1293 if ((ipaddr & mask) != (ina & mask))
1302 syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name);
1305 * Now scan through again looking for a link-level address
1306 * for this interface.
1309 for (ifr = ifc.ifc_req; ifr < ifend; ) {
1310 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
1311 && ifr->ifr_addr.sa_family == AF_LINK) {
1313 * Found the link-level address - copy it out
1315 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
1316 BCOPY(dla, hwaddr, dla->sdl_len);
1319 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
1326 * Return user specified netmask, modified by any mask we might determine
1327 * for address `addr' (in network byte order).
1328 * Here we scan through the system's list of interfaces, looking for
1329 * any non-point-to-point interfaces which might appear to be on the same
1330 * network as `addr'. If we find any, we OR in their netmask to the
1331 * user-specified netmask.
1337 u_int32_t mask, nmask, ina;
1338 struct ifreq *ifr, *ifend, ifreq;
1340 struct ifreq ifs[MAX_IFS];
1343 if (IN_CLASSA(addr)) /* determine network mask for address class */
1344 nmask = IN_CLASSA_NET;
1345 else if (IN_CLASSB(addr))
1346 nmask = IN_CLASSB_NET;
1348 nmask = IN_CLASSC_NET;
1349 /* class D nets are disallowed by bad_ip_adrs */
1350 mask = netmask | htonl(nmask);
1353 * Scan through the system's network interfaces.
1355 ifc.ifc_len = sizeof(ifs);
1357 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1358 syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m");
1361 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1362 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1363 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1365 * Check the interface's internet address.
1367 if (ifr->ifr_addr.sa_family != AF_INET)
1369 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1370 if ((ntohl(ina) & nmask) != (addr & nmask))
1373 * Check that the interface is up, and not point-to-point or loopback.
1375 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1376 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1378 if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
1382 * Get its netmask and OR it into our mask.
1384 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1386 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
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];
1405 if ((p = strrchr(dev, '/')) != NULL)
1407 lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1);
1408 if (lock_file == NULL)
1409 novm("lock file name");
1410 strcat(strcpy(lock_file, LOCK_PREFIX), dev);
1412 while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
1414 && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
1415 /* Read the lock file to find out who has the device locked */
1416 n = read(fd, hdb_lock_buffer, 11);
1418 syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
1421 hdb_lock_buffer[n] = 0;
1422 pid = atoi(hdb_lock_buffer);
1423 if (kill(pid, 0) == -1 && errno == ESRCH) {
1424 /* pid no longer exists - remove the lock file */
1425 if (unlink(lock_file) == 0) {
1427 syslog(LOG_NOTICE, "Removed stale lock on %s (pid %d)",
1431 syslog(LOG_WARNING, "Couldn't remove stale lock on %s",
1434 syslog(LOG_NOTICE, "Device %s is locked by pid %d",
1439 syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file);
1445 sprintf(hdb_lock_buffer, "%10d\n", getpid());
1446 write(fd, hdb_lock_buffer, 11);
1453 * unlock - remove our lockfile