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 1.35 1999/03/08 01:46:21 paulus Exp $";
25 /* $NetBSD: sys-bsd.c,v 1.1.1.3 1997/09/26 18:53:04 christos Exp $ */
41 #include <sys/ioctl.h>
42 #include <sys/types.h>
43 #include <sys/socket.h>
46 #include <sys/param.h>
55 #include <net/ppp_defs.h>
56 #include <net/if_ppp.h>
57 #include <net/route.h>
58 #include <net/if_dl.h>
59 #include <netinet/in.h>
62 #include <sys/param.h>
63 #if defined(NetBSD) && (NetBSD >= 199703)
64 #include <netinet/if_inarp.h>
65 #else /* NetBSD 1.2D or later */
67 #include <netinet/if_ether.h>
69 #include <net/if_ether.h>
78 static int initdisc = -1; /* Initial TTY discipline for ppp_fd */
79 static int initfdflags = -1; /* Initial file descriptor flags for ppp_fd */
80 static int ppp_fd = -1; /* fd which is set to PPP discipline */
83 static int restore_term; /* 1 => we've munged the terminal */
84 static struct termios inittermios; /* Initial TTY termios */
85 static struct winsize wsinfo; /* Initial window size info */
87 static char *lock_file; /* name of lock file created */
89 static int loop_slave = -1;
90 static int loop_master;
91 static char loop_name[20];
93 static unsigned char inbuf[512]; /* buffer for chars read from loopback */
95 static int sockfd; /* socket for doing interface ioctls */
97 static int if_is_up; /* the interface is currently up */
98 static u_int32_t ifaddrs[2]; /* local and remote addresses we set */
99 static u_int32_t default_route_gateway; /* gateway addr for default route */
100 static u_int32_t proxy_arp_addr; /* remote addr for proxy arp */
102 /* Prototypes for procedures local to this file. */
103 static int dodefaultroute __P((u_int32_t, int));
104 static int get_ether_addr __P((u_int32_t, struct sockaddr_dl *));
108 * sys_init - System-dependent initialization.
113 /* Get an internet socket for doing socket ioctl's on. */
114 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
115 syslog(LOG_ERR, "Couldn't create IP socket: %m");
121 * sys_cleanup - restore any system state we modified before exiting:
122 * mark the interface down, delete default route and/or proxy arp entry.
123 * This should call die() because it's called from die().
131 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
132 if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0
133 && ((ifr.ifr_flags & IFF_UP) != 0)) {
134 ifr.ifr_flags &= ~IFF_UP;
135 ioctl(sockfd, SIOCSIFFLAGS, &ifr);
139 cifaddr(0, ifaddrs[0], ifaddrs[1]);
140 if (default_route_gateway)
141 cifdefaultroute(0, 0, default_route_gateway);
143 cifproxyarp(0, proxy_arp_addr);
147 * sys_close - Clean up in a child process before execing.
153 if (loop_slave >= 0) {
160 * sys_check_options - check the options that the user specified
167 syslog(LOG_WARNING, "DTR/CTS flow control is not supported on this system");
175 * ppp_available - check whether the system has any ppp interfaces
176 * (in fact we check whether we can do an ioctl on ppp0).
183 extern char *no_ppp_msg;
185 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
186 return 1; /* can't tell */
188 strncpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
189 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
193 This system lacks kernel support for PPP. To include PPP support\n\
194 in the kernel, please follow the steps detailed in the README.bsd\n\
195 file in the ppp-2.2 distribution.\n";
200 * establish_ppp - Turn the serial port into a ppp interface.
206 int pppdisc = PPPDISC;
211 * Demand mode - prime the old ppp device to relinquish the unit.
213 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0) {
214 syslog(LOG_ERR, "ioctl(transfer ppp unit): %m");
220 * Save the old line discipline of fd, and set it to PPP.
222 if (ioctl(fd, TIOCGETD, &initdisc) < 0) {
223 syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
226 if (ioctl(fd, TIOCSETD, &pppdisc) < 0) {
227 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
233 * Find out which interface we were given.
235 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
236 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
241 * Check that we got the same unit again.
243 if (ioctl(fd, PPPIOCGUNIT, &x) < 0) {
244 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
248 syslog(LOG_ERR, "transfer_ppp failed: wanted unit %d, got %d",
253 ioctl(loop_slave, TIOCSETD, &x);
259 * Enable debug in the driver if requested.
262 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
263 syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m");
265 x |= (kdebugflag & 0xFF) * SC_DEBUG;
266 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
267 syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
272 * Set device for non-blocking reads.
274 if ((initfdflags = fcntl(fd, F_GETFL)) == -1
275 || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
276 syslog(LOG_WARNING, "Couldn't set device to non-blocking mode: %m");
281 * restore_loop - reattach the ppp unit to the loopback.
289 * Transfer the ppp interface back to the loopback.
291 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0) {
292 syslog(LOG_ERR, "ioctl(transfer ppp unit): %m");
296 if (ioctl(loop_slave, TIOCSETD, &x) < 0) {
297 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
302 * Check that we got the same unit again.
304 if (ioctl(loop_slave, PPPIOCGUNIT, &x) < 0) {
305 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
309 syslog(LOG_ERR, "transfer_ppp failed: wanted unit %d, got %d",
318 * disestablish_ppp - Restore the serial port to normal operation.
319 * This shouldn't call die() because it's called from die().
325 /* Reset non-blocking mode on fd. */
326 if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
327 syslog(LOG_WARNING, "Couldn't restore device fd flags: %m");
330 /* Restore old line discipline. */
331 if (initdisc >= 0 && ioctl(fd, TIOCSETD, &initdisc) < 0)
332 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
340 * Check whether the link seems not to be 8-bit clean.
348 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
350 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
352 s = "bit 7 set to 1";
355 s = "bit 7 set to 0";
365 syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
366 syslog(LOG_WARNING, "All received characters had %s", s);
372 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
373 * at the requested speed, etc. If `local' is true, set CLOCAL
374 * regardless of whether the modem option was specified.
376 * For *BSD, we assume that speed_t values numerically equal bits/second.
379 set_up_tty(fd, local)
384 if (tcgetattr(fd, &tios) < 0) {
385 syslog(LOG_ERR, "tcgetattr: %m");
391 ioctl(fd, TIOCGWINSZ, &wsinfo);
394 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
395 if (crtscts > 0 && !local) {
398 tios.c_cflag |= CDTRCTS;
401 tios.c_cflag |= CRTSCTS;
402 } else if (crtscts < 0) {
403 tios.c_cflag &= ~CRTSCTS;
405 tios.c_cflag &= ~CDTRCTS;
409 tios.c_cflag |= CS8 | CREAD | HUPCL;
411 tios.c_cflag |= CLOCAL;
412 tios.c_iflag = IGNBRK | IGNPAR;
416 tios.c_cc[VTIME] = 0;
419 tios.c_iflag |= IXON | IXOFF;
420 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
421 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
425 cfsetospeed(&tios, inspeed);
426 cfsetispeed(&tios, inspeed);
428 inspeed = cfgetospeed(&tios);
430 * We can't proceed if the serial port speed is 0,
431 * since that implies that the serial port is disabled.
434 syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
441 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
442 syslog(LOG_ERR, "tcsetattr: %m");
450 * restore_tty - restore the terminal to the saved settings.
457 if (!default_device) {
459 * Turn off echoing, because otherwise we can get into
460 * a loop with the tty and the modem echoing to each other.
461 * We presume we are the sole user of this tty device, so
462 * when we close it, it will revert to its defaults anyway.
464 inittermios.c_lflag &= ~(ECHO | ECHONL);
466 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
468 syslog(LOG_WARNING, "tcsetattr: %m");
469 ioctl(fd, TIOCSWINSZ, &wsinfo);
475 * setdtr - control the DTR line on the serial port.
476 * This is called from die(), so it shouldn't call die().
482 int modembits = TIOCM_DTR;
484 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
489 * open_ppp_loopback - open the device we use for getting
490 * packets in demand mode, and connect it to a ppp interface.
498 int pppdisc = PPPDISC;
500 if (openpty(&loop_master, &loop_slave, loop_name, NULL, NULL) < 0) {
501 syslog(LOG_ERR, "No free pty for loopback");
504 SYSDEBUG((LOG_DEBUG, "using %s for loopback", loop_name));
506 if (tcgetattr(loop_slave, &tios) == 0) {
507 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
508 tios.c_cflag |= CS8 | CREAD;
509 tios.c_iflag = IGNPAR;
512 if (tcsetattr(loop_slave, TCSAFLUSH, &tios) < 0)
513 syslog(LOG_WARNING, "couldn't set attributes on loopback: %m");
516 if ((flags = fcntl(loop_master, F_GETFL)) != -1)
517 if (fcntl(loop_master, F_SETFL, flags | O_NONBLOCK) == -1)
518 syslog(LOG_WARNING, "couldn't set loopback to nonblock: %m");
521 if (ioctl(ppp_fd, TIOCSETD, &pppdisc) < 0) {
522 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
527 * Find out which interface we were given.
529 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0) {
530 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
535 * Enable debug in the driver if requested.
538 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
539 syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m");
541 flags |= (kdebugflag & 0xFF) * SC_DEBUG;
542 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
543 syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
551 * output - Output PPP packet.
560 log_packet(p, len, "sent ", LOG_DEBUG);
562 if (write(ttyfd, p, len) < 0) {
564 syslog(LOG_ERR, "write: %m");
570 * wait_input - wait until there is data available on ttyfd,
571 * for the length of time specified by *timo (indefinite
576 struct timeval *timo;
582 FD_SET(ttyfd, &ready);
583 n = select(ttyfd+1, &ready, NULL, &ready, timo);
584 if (n < 0 && errno != EINTR) {
585 syslog(LOG_ERR, "select: %m");
592 * wait_loop_output - wait until there is data available on the
593 * loopback, for the length of time specified by *timo (indefinite
597 wait_loop_output(timo)
598 struct timeval *timo;
604 FD_SET(loop_master, &ready);
605 n = select(loop_master + 1, &ready, NULL, &ready, timo);
606 if (n < 0 && errno != EINTR) {
607 syslog(LOG_ERR, "select: %m");
614 * wait_time - wait for a given length of time or until a
615 * signal is received.
619 struct timeval *timo;
623 n = select(0, NULL, NULL, NULL, timo);
624 if (n < 0 && errno != EINTR) {
625 syslog(LOG_ERR, "select: %m");
632 * read_packet - get a PPP packet from the serial device.
640 if ((len = read(ttyfd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
641 if (errno == EWOULDBLOCK || errno == EINTR)
643 syslog(LOG_ERR, "read: %m");
651 * get_loop_output - read characters from the loopback, form them
652 * into frames, and detect when we want to bring the real link up.
653 * Return value is 1 if we need to bring up the link, 0 otherwise.
661 while ((n = read(loop_master, inbuf, sizeof(inbuf))) >= 0) {
662 if (loop_chars(inbuf, n))
667 syslog(LOG_ERR, "eof on loopback");
669 } else if (errno != EWOULDBLOCK){
670 syslog(LOG_ERR, "read from loopback: %m");
679 * ppp_send_config - configure the transmit characteristics of
683 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
691 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
693 if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
694 syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
698 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
699 syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
703 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
704 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
707 x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
708 x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
709 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
710 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
717 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
720 ppp_set_xaccm(unit, accm)
724 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
725 syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
730 * ppp_recv_config - configure the receive-side characteristics of
734 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
741 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
742 syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
745 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
746 syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
749 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
750 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
753 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
754 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
755 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
761 * ccp_test - ask kernel whether a given compression method
762 * is acceptable for use. Returns 1 if the method and parameters
763 * are OK, 0 if the method is known but the parameters are not OK
764 * (e.g. code size should be reduced), or -1 if the method is unknown.
767 ccp_test(unit, opt_ptr, opt_len, for_transmit)
768 int unit, opt_len, for_transmit;
771 struct ppp_option_data data;
774 data.length = opt_len;
775 data.transmit = for_transmit;
776 if (ioctl(ttyfd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
778 return (errno == ENOBUFS)? 0: -1;
782 * ccp_flags_set - inform kernel about the current state of CCP.
785 ccp_flags_set(unit, isopen, isup)
786 int unit, isopen, isup;
790 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
791 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
794 x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
795 x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
796 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
797 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
801 * ccp_fatal_error - returns 1 if decompression was disabled as a
802 * result of an error detected after decompression of a packet,
803 * 0 otherwise. This is necessary because of patent nonsense.
806 ccp_fatal_error(unit)
811 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
812 syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
815 return x & SC_DC_FERROR;
819 * get_idle_time - return how long the link has been idle.
826 return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
832 * set_filters - transfer the pass and active filters to the kernel.
835 set_filters(pass, active)
836 struct bpf_program *pass, *active;
840 if (pass->bf_len > 0) {
841 if (ioctl(ppp_fd, PPPIOCSPASS, pass) < 0) {
842 syslog(LOG_ERR, "Couldn't set pass-filter in kernel: %m");
846 if (active->bf_len > 0) {
847 if (ioctl(ppp_fd, PPPIOCSACTIVE, active) < 0) {
848 syslog(LOG_ERR, "Couldn't set active-filter in kernel: %m");
857 * sifvjcomp - config tcp header compression
860 sifvjcomp(u, vjcomp, cidcomp, maxcid)
861 int u, vjcomp, cidcomp, maxcid;
865 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
866 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
869 x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
870 x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
871 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
872 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
875 if (vjcomp && ioctl(ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
876 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
883 * sifup - Config the interface up and enable IP packets to pass.
891 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
892 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
893 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
896 ifr.ifr_flags |= IFF_UP;
897 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
898 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
906 * sifnpmode - Set the mode for handling packets for a given NP.
909 sifnpmode(u, proto, mode)
916 npi.protocol = proto;
918 if (ioctl(ppp_fd, PPPIOCSNPMODE, &npi) < 0) {
919 syslog(LOG_ERR, "ioctl(set NP %d mode to %d): %m", proto, mode);
926 * sifdown - Config the interface down and disable IP.
937 npi.protocol = PPP_IP;
938 npi.mode = NPMODE_ERROR;
939 ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi);
940 /* ignore errors, because ppp_fd might have been closed by now. */
942 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
943 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
944 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
947 ifr.ifr_flags &= ~IFF_UP;
948 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
949 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
958 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
961 #define SET_SA_FAMILY(addr, family) \
962 BZERO((char *) &(addr), sizeof(addr)); \
963 addr.sa_family = (family); \
964 addr.sa_len = sizeof(addr);
967 * sifaddr - Config the interface IP addresses and netmask.
974 struct ifaliasreq ifra;
977 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
978 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
979 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
980 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
981 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
983 SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
984 ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
986 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
987 BZERO(&ifr, sizeof(ifr));
988 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
989 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifr) < 0) {
990 if (errno != EADDRNOTAVAIL)
991 syslog(LOG_WARNING, "Couldn't remove interface address: %m");
993 if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
994 if (errno != EEXIST) {
995 syslog(LOG_ERR, "Couldn't set interface address: %m");
999 "Couldn't set interface address: Address %s already exists",
1008 * cifaddr - Clear the interface IP addresses, and delete routes
1009 * through the interface if possible.
1016 struct ifaliasreq ifra;
1019 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
1020 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
1021 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
1022 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
1023 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
1024 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
1025 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
1026 if (errno != EADDRNOTAVAIL)
1027 syslog(LOG_WARNING, "Couldn't delete interface address: %m");
1034 * sifdefaultroute - assign a default route through the address given.
1037 sifdefaultroute(u, l, g)
1041 return dodefaultroute(g, 's');
1045 * cifdefaultroute - delete a default route through the address given.
1048 cifdefaultroute(u, l, g)
1052 return dodefaultroute(g, 'c');
1056 * dodefaultroute - talk to a routing socket to add/delete a default route.
1059 dodefaultroute(g, cmd)
1065 struct rt_msghdr hdr;
1066 struct sockaddr_in dst;
1067 struct sockaddr_in gway;
1068 struct sockaddr_in mask;
1071 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1072 syslog(LOG_ERR, "Couldn't %s default route: socket: %m",
1073 cmd=='s'? "add": "delete");
1077 memset(&rtmsg, 0, sizeof(rtmsg));
1078 rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
1079 rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
1080 rtmsg.hdr.rtm_version = RTM_VERSION;
1081 rtmsg.hdr.rtm_seq = ++rtm_seq;
1082 rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
1083 rtmsg.dst.sin_len = sizeof(rtmsg.dst);
1084 rtmsg.dst.sin_family = AF_INET;
1085 rtmsg.gway.sin_len = sizeof(rtmsg.gway);
1086 rtmsg.gway.sin_family = AF_INET;
1087 rtmsg.gway.sin_addr.s_addr = g;
1088 rtmsg.mask.sin_len = sizeof(rtmsg.dst);
1089 rtmsg.mask.sin_family = AF_INET;
1091 rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
1092 if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
1093 syslog(LOG_ERR, "Couldn't %s default route: %m",
1094 cmd=='s'? "add": "delete");
1100 default_route_gateway = (cmd == 's')? g: 0;
1104 #if RTM_VERSION >= 3
1107 * sifproxyarp - Make a proxy ARP entry for the peer.
1110 struct rt_msghdr hdr;
1111 struct sockaddr_inarp dst;
1112 struct sockaddr_dl hwa;
1116 static int arpmsg_valid;
1119 sifproxyarp(unit, hisaddr)
1126 * Get the hardware address of an interface on the same subnet
1127 * as our local address.
1129 memset(&arpmsg, 0, sizeof(arpmsg));
1130 if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
1131 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
1135 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1136 syslog(LOG_ERR, "Couldn't add proxy arp entry: socket: %m");
1140 arpmsg.hdr.rtm_type = RTM_ADD;
1141 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
1142 arpmsg.hdr.rtm_version = RTM_VERSION;
1143 arpmsg.hdr.rtm_seq = ++rtm_seq;
1144 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
1145 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
1146 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
1147 arpmsg.dst.sin_family = AF_INET;
1148 arpmsg.dst.sin_addr.s_addr = hisaddr;
1149 arpmsg.dst.sin_other = SIN_PROXY;
1151 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
1152 + arpmsg.hwa.sdl_len;
1153 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1154 syslog(LOG_ERR, "Couldn't add proxy arp entry: %m");
1161 proxy_arp_addr = hisaddr;
1166 * cifproxyarp - Delete the proxy ARP entry for the peer.
1169 cifproxyarp(unit, hisaddr)
1179 arpmsg.hdr.rtm_type = RTM_DELETE;
1180 arpmsg.hdr.rtm_seq = ++rtm_seq;
1182 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1183 syslog(LOG_ERR, "Couldn't delete proxy arp entry: socket: %m");
1187 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1188 syslog(LOG_ERR, "Couldn't delete proxy arp entry: %m");
1198 #else /* RTM_VERSION */
1201 * sifproxyarp - Make a proxy ARP entry for the peer.
1204 sifproxyarp(unit, hisaddr)
1208 struct arpreq arpreq;
1210 struct sockaddr_dl sdl;
1214 BZERO(&arpreq, sizeof(arpreq));
1217 * Get the hardware address of an interface on the same subnet
1218 * as our local address.
1220 if (!get_ether_addr(hisaddr, &dls.sdl)) {
1221 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
1225 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
1226 arpreq.arp_ha.sa_family = AF_UNSPEC;
1227 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
1228 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1229 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1230 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1231 if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1232 syslog(LOG_ERR, "Couldn't add proxy arp entry: %m");
1236 proxy_arp_addr = hisaddr;
1241 * cifproxyarp - Delete the proxy ARP entry for the peer.
1244 cifproxyarp(unit, hisaddr)
1248 struct arpreq arpreq;
1250 BZERO(&arpreq, sizeof(arpreq));
1251 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1252 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1253 if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1254 syslog(LOG_WARNING, "Couldn't delete proxy arp entry: %m");
1260 #endif /* RTM_VERSION */
1264 * get_ether_addr - get the hardware address of an interface on the
1265 * the same subnet as ipaddr.
1270 get_ether_addr(ipaddr, hwaddr)
1272 struct sockaddr_dl *hwaddr;
1274 struct ifreq *ifr, *ifend, *ifp;
1275 u_int32_t ina, mask;
1276 struct sockaddr_dl *dla;
1279 struct ifreq ifs[MAX_IFS];
1281 ifc.ifc_len = sizeof(ifs);
1283 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1284 syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
1289 * Scan through looking for an interface with an Internet
1290 * address on the same subnet as `ipaddr'.
1292 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1293 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1294 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1295 if (ifr->ifr_addr.sa_family == AF_INET) {
1296 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1297 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1299 * Check that the interface is up, and not point-to-point
1302 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1304 if ((ifreq.ifr_flags &
1305 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
1306 != (IFF_UP|IFF_BROADCAST))
1309 * Get its netmask and check that it's on the right subnet.
1311 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1313 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1314 if ((ipaddr & mask) != (ina & mask))
1323 syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name);
1326 * Now scan through again looking for a link-level address
1327 * for this interface.
1330 for (ifr = ifc.ifc_req; ifr < ifend; ) {
1331 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
1332 && ifr->ifr_addr.sa_family == AF_LINK) {
1334 * Found the link-level address - copy it out
1336 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
1337 BCOPY(dla, hwaddr, dla->sdl_len);
1340 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
1347 * Return user specified netmask, modified by any mask we might determine
1348 * for address `addr' (in network byte order).
1349 * Here we scan through the system's list of interfaces, looking for
1350 * any non-point-to-point interfaces which might appear to be on the same
1351 * network as `addr'. If we find any, we OR in their netmask to the
1352 * user-specified netmask.
1358 u_int32_t mask, nmask, ina;
1359 struct ifreq *ifr, *ifend, ifreq;
1361 struct ifreq ifs[MAX_IFS];
1364 if (IN_CLASSA(addr)) /* determine network mask for address class */
1365 nmask = IN_CLASSA_NET;
1366 else if (IN_CLASSB(addr))
1367 nmask = IN_CLASSB_NET;
1369 nmask = IN_CLASSC_NET;
1370 /* class D nets are disallowed by bad_ip_adrs */
1371 mask = netmask | htonl(nmask);
1374 * Scan through the system's network interfaces.
1376 ifc.ifc_len = sizeof(ifs);
1378 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1379 syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m");
1382 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1383 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1384 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1386 * Check the interface's internet address.
1388 if (ifr->ifr_addr.sa_family != AF_INET)
1390 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1391 if ((ntohl(ina) & nmask) != (addr & nmask))
1394 * Check that the interface is up, and not point-to-point or loopback.
1396 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1397 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1399 if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
1403 * Get its netmask and OR it into our mask.
1405 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1407 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1414 * have_route_to - determine if the system has any route to
1415 * a given IP address.
1416 * For demand mode to work properly, we have to ignore routes
1417 * through our own interface.
1419 int have_route_to(u_int32_t addr)
1425 * Use the hostid as part of the random number seed.
1434 * lock - create a lock file for the named lock device
1436 #define LOCK_PREFIX "/var/spool/lock/LCK.."
1442 char hdb_lock_buffer[12];
1446 if ((p = strrchr(dev, '/')) != NULL)
1448 lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1);
1449 if (lock_file == NULL)
1450 novm("lock file name");
1451 strcat(strcpy(lock_file, LOCK_PREFIX), dev);
1453 while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
1455 && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
1456 /* Read the lock file to find out who has the device locked */
1457 n = read(fd, hdb_lock_buffer, 11);
1459 syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
1462 hdb_lock_buffer[n] = 0;
1463 pid = atoi(hdb_lock_buffer);
1464 if (kill(pid, 0) == -1 && errno == ESRCH) {
1465 /* pid no longer exists - remove the lock file */
1466 if (unlink(lock_file) == 0) {
1468 syslog(LOG_NOTICE, "Removed stale lock on %s (pid %d)",
1472 syslog(LOG_WARNING, "Couldn't remove stale lock on %s",
1475 syslog(LOG_NOTICE, "Device %s is locked by pid %d",
1480 syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file);
1486 sprintf(hdb_lock_buffer, "%10d\n", getpid());
1487 write(fd, hdb_lock_buffer, 11);
1494 * unlock - remove our lockfile