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 1.32 1998/09/02 20:58:13 christos 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
168 * ppp_available - check whether the system has any ppp interfaces
169 * (in fact we check whether we can do an ioctl on ppp0).
176 extern char *no_ppp_msg;
178 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
179 return 1; /* can't tell */
181 strncpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
182 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
186 This system lacks kernel support for PPP. To include PPP support\n\
187 in the kernel, please follow the steps detailed in the README.bsd\n\
188 file in the ppp-2.2 distribution.\n";
193 * establish_ppp - Turn the serial port into a ppp interface.
199 int pppdisc = PPPDISC;
204 * Demand mode - prime the old ppp device to relinquish the unit.
206 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0) {
207 syslog(LOG_ERR, "ioctl(transfer ppp unit): %m");
213 * Save the old line discipline of fd, and set it to PPP.
215 if (ioctl(fd, TIOCGETD, &initdisc) < 0) {
216 syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
219 if (ioctl(fd, TIOCSETD, &pppdisc) < 0) {
220 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
226 * Find out which interface we were given.
228 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
229 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
234 * Check that we got the same unit again.
236 if (ioctl(fd, PPPIOCGUNIT, &x) < 0) {
237 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
241 syslog(LOG_ERR, "transfer_ppp failed: wanted unit %d, got %d",
246 ioctl(loop_slave, TIOCSETD, &x);
252 * Enable debug in the driver if requested.
255 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
256 syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m");
258 x |= (kdebugflag & 0xFF) * SC_DEBUG;
259 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
260 syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
265 * Set device for non-blocking reads.
267 if ((initfdflags = fcntl(fd, F_GETFL)) == -1
268 || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) {
269 syslog(LOG_WARNING, "Couldn't set device to non-blocking mode: %m");
274 * restore_loop - reattach the ppp unit to the loopback.
282 * Transfer the ppp interface back to the loopback.
284 if (ioctl(ppp_fd, PPPIOCXFERUNIT, 0) < 0) {
285 syslog(LOG_ERR, "ioctl(transfer ppp unit): %m");
289 if (ioctl(loop_slave, TIOCSETD, &x) < 0) {
290 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
295 * Check that we got the same unit again.
297 if (ioctl(loop_slave, PPPIOCGUNIT, &x) < 0) {
298 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
302 syslog(LOG_ERR, "transfer_ppp failed: wanted unit %d, got %d",
311 * disestablish_ppp - Restore the serial port to normal operation.
312 * This shouldn't call die() because it's called from die().
318 /* Reset non-blocking mode on fd. */
319 if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0)
320 syslog(LOG_WARNING, "Couldn't restore device fd flags: %m");
323 /* Restore old line discipline. */
324 if (initdisc >= 0 && ioctl(fd, TIOCSETD, &initdisc) < 0)
325 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
333 * Check whether the link seems not to be 8-bit clean.
341 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
343 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
345 s = "bit 7 set to 1";
348 s = "bit 7 set to 0";
358 syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
359 syslog(LOG_WARNING, "All received characters had %s", s);
365 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
366 * at the requested speed, etc. If `local' is true, set CLOCAL
367 * regardless of whether the modem option was specified.
369 * For *BSD, we assume that speed_t values numerically equal bits/second.
372 set_up_tty(fd, local)
377 if (tcgetattr(fd, &tios) < 0) {
378 syslog(LOG_ERR, "tcgetattr: %m");
384 ioctl(fd, TIOCGWINSZ, &wsinfo);
387 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
388 if (crtscts > 0 && !local)
389 tios.c_cflag |= CRTSCTS;
390 else if (crtscts < 0)
391 tios.c_cflag &= ~CRTSCTS;
393 tios.c_cflag |= CS8 | CREAD | HUPCL;
395 tios.c_cflag |= CLOCAL;
396 tios.c_iflag = IGNBRK | IGNPAR;
400 tios.c_cc[VTIME] = 0;
403 tios.c_iflag |= IXON | IXOFF;
404 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
405 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
409 cfsetospeed(&tios, inspeed);
410 cfsetispeed(&tios, inspeed);
412 inspeed = cfgetospeed(&tios);
414 * We can't proceed if the serial port speed is 0,
415 * since that implies that the serial port is disabled.
418 syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
425 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
426 syslog(LOG_ERR, "tcsetattr: %m");
434 * restore_tty - restore the terminal to the saved settings.
441 if (!default_device) {
443 * Turn off echoing, because otherwise we can get into
444 * a loop with the tty and the modem echoing to each other.
445 * We presume we are the sole user of this tty device, so
446 * when we close it, it will revert to its defaults anyway.
448 inittermios.c_lflag &= ~(ECHO | ECHONL);
450 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
452 syslog(LOG_WARNING, "tcsetattr: %m");
453 ioctl(fd, TIOCSWINSZ, &wsinfo);
459 * setdtr - control the DTR line on the serial port.
460 * This is called from die(), so it shouldn't call die().
466 int modembits = TIOCM_DTR;
468 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
473 * open_ppp_loopback - open the device we use for getting
474 * packets in demand mode, and connect it to a ppp interface.
482 int pppdisc = PPPDISC;
484 if (openpty(&loop_master, &loop_slave, loop_name, NULL, NULL) < 0) {
485 syslog(LOG_ERR, "No free pty for loopback");
488 SYSDEBUG((LOG_DEBUG, "using %s for loopback", loop_name));
490 if (tcgetattr(loop_slave, &tios) == 0) {
491 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB);
492 tios.c_cflag |= CS8 | CREAD;
493 tios.c_iflag = IGNPAR;
496 if (tcsetattr(loop_slave, TCSAFLUSH, &tios) < 0)
497 syslog(LOG_WARNING, "couldn't set attributes on loopback: %m");
500 if ((flags = fcntl(loop_master, F_GETFL)) != -1)
501 if (fcntl(loop_master, F_SETFL, flags | O_NONBLOCK) == -1)
502 syslog(LOG_WARNING, "couldn't set loopback to nonblock: %m");
505 if (ioctl(ppp_fd, TIOCSETD, &pppdisc) < 0) {
506 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
511 * Find out which interface we were given.
513 if (ioctl(ppp_fd, PPPIOCGUNIT, &ifunit) < 0) {
514 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
519 * Enable debug in the driver if requested.
522 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &flags) < 0) {
523 syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m");
525 flags |= (kdebugflag & 0xFF) * SC_DEBUG;
526 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &flags) < 0)
527 syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
535 * output - Output PPP packet.
544 log_packet(p, len, "sent ", LOG_DEBUG);
546 if (write(ttyfd, p, len) < 0) {
548 syslog(LOG_ERR, "write: %m");
554 * wait_input - wait until there is data available on ttyfd,
555 * for the length of time specified by *timo (indefinite
560 struct timeval *timo;
566 FD_SET(ttyfd, &ready);
567 n = select(ttyfd+1, &ready, NULL, &ready, timo);
568 if (n < 0 && errno != EINTR) {
569 syslog(LOG_ERR, "select: %m");
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) {
591 syslog(LOG_ERR, "select: %m");
598 * wait_time - wait for a given length of time or until a
599 * signal is received.
603 struct timeval *timo;
607 n = select(0, NULL, NULL, NULL, timo);
608 if (n < 0 && errno != EINTR) {
609 syslog(LOG_ERR, "select: %m");
616 * read_packet - get a PPP packet from the serial device.
624 if ((len = read(ttyfd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
625 if (errno == EWOULDBLOCK || errno == EINTR)
627 syslog(LOG_ERR, "read: %m");
635 * get_loop_output - read characters from the loopback, form them
636 * into frames, and detect when we want to bring the real link up.
637 * Return value is 1 if we need to bring up the link, 0 otherwise.
645 while ((n = read(loop_master, inbuf, sizeof(inbuf))) >= 0) {
646 if (loop_chars(inbuf, n))
651 syslog(LOG_ERR, "eof on loopback");
653 } else if (errno != EWOULDBLOCK){
654 syslog(LOG_ERR, "read from loopback: %m");
663 * ppp_send_config - configure the transmit characteristics of
667 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
675 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
677 if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
678 syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
682 if (ioctl(ppp_fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
683 syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
687 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
688 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
691 x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
692 x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
693 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
694 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
701 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
704 ppp_set_xaccm(unit, accm)
708 if (ioctl(ppp_fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
709 syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
714 * ppp_recv_config - configure the receive-side characteristics of
718 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
725 if (ioctl(ppp_fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
726 syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
729 if (ioctl(ppp_fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
730 syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
733 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
734 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
737 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
738 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
739 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
745 * ccp_test - ask kernel whether a given compression method
746 * is acceptable for use. Returns 1 if the method and parameters
747 * are OK, 0 if the method is known but the parameters are not OK
748 * (e.g. code size should be reduced), or -1 if the method is unknown.
751 ccp_test(unit, opt_ptr, opt_len, for_transmit)
752 int unit, opt_len, for_transmit;
755 struct ppp_option_data data;
758 data.length = opt_len;
759 data.transmit = for_transmit;
760 if (ioctl(ttyfd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0)
762 return (errno == ENOBUFS)? 0: -1;
766 * ccp_flags_set - inform kernel about the current state of CCP.
769 ccp_flags_set(unit, isopen, isup)
770 int unit, isopen, isup;
774 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
775 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
778 x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
779 x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
780 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
781 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
785 * ccp_fatal_error - returns 1 if decompression was disabled as a
786 * result of an error detected after decompression of a packet,
787 * 0 otherwise. This is necessary because of patent nonsense.
790 ccp_fatal_error(unit)
795 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
796 syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
799 return x & SC_DC_FERROR;
803 * get_idle_time - return how long the link has been idle.
810 return ioctl(ppp_fd, PPPIOCGIDLE, ip) >= 0;
816 * set_filters - transfer the pass and active filters to the kernel.
819 set_filters(pass, active)
820 struct bpf_program *pass, *active;
824 if (pass->bf_len > 0) {
825 if (ioctl(ppp_fd, PPPIOCSPASS, pass) < 0) {
826 syslog(LOG_ERR, "Couldn't set pass-filter in kernel: %m");
830 if (active->bf_len > 0) {
831 if (ioctl(ppp_fd, PPPIOCSACTIVE, active) < 0) {
832 syslog(LOG_ERR, "Couldn't set active-filter in kernel: %m");
841 * sifvjcomp - config tcp header compression
844 sifvjcomp(u, vjcomp, cidcomp, maxcid)
845 int u, vjcomp, cidcomp, maxcid;
849 if (ioctl(ppp_fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
850 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
853 x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
854 x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
855 if (ioctl(ppp_fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
856 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
859 if (vjcomp && ioctl(ppp_fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
860 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
867 * sifup - Config the interface up and enable IP packets to pass.
875 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
876 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
877 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
880 ifr.ifr_flags |= IFF_UP;
881 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
882 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
890 * sifnpmode - Set the mode for handling packets for a given NP.
893 sifnpmode(u, proto, mode)
900 npi.protocol = proto;
902 if (ioctl(ppp_fd, PPPIOCSNPMODE, &npi) < 0) {
903 syslog(LOG_ERR, "ioctl(set NP %d mode to %d): %m", proto, mode);
910 * sifdown - Config the interface down and disable IP.
921 npi.protocol = PPP_IP;
922 npi.mode = NPMODE_ERROR;
923 ioctl(ppp_fd, PPPIOCSNPMODE, (caddr_t) &npi);
924 /* ignore errors, because ppp_fd might have been closed by now. */
926 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
927 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
928 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
931 ifr.ifr_flags &= ~IFF_UP;
932 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
933 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
942 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
945 #define SET_SA_FAMILY(addr, family) \
946 BZERO((char *) &(addr), sizeof(addr)); \
947 addr.sa_family = (family); \
948 addr.sa_len = sizeof(addr);
951 * sifaddr - Config the interface IP addresses and netmask.
958 struct ifaliasreq ifra;
961 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
962 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
963 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
964 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
965 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
967 SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
968 ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
970 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
971 BZERO(&ifr, sizeof(ifr));
972 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
973 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifr) < 0) {
974 if (errno != EADDRNOTAVAIL)
975 syslog(LOG_WARNING, "Couldn't remove interface address: %m");
977 if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
978 if (errno != EEXIST) {
979 syslog(LOG_ERR, "Couldn't set interface address: %m");
983 "Couldn't set interface address: Address %s already exists",
992 * cifaddr - Clear the interface IP addresses, and delete routes
993 * through the interface if possible.
1000 struct ifaliasreq ifra;
1003 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
1004 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
1005 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
1006 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
1007 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
1008 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
1009 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
1010 if (errno != EADDRNOTAVAIL)
1011 syslog(LOG_WARNING, "Couldn't delete interface address: %m");
1018 * sifdefaultroute - assign a default route through the address given.
1021 sifdefaultroute(u, l, g)
1025 return dodefaultroute(g, 's');
1029 * cifdefaultroute - delete a default route through the address given.
1032 cifdefaultroute(u, l, g)
1036 return dodefaultroute(g, 'c');
1040 * dodefaultroute - talk to a routing socket to add/delete a default route.
1043 dodefaultroute(g, cmd)
1049 struct rt_msghdr hdr;
1050 struct sockaddr_in dst;
1051 struct sockaddr_in gway;
1052 struct sockaddr_in mask;
1055 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1056 syslog(LOG_ERR, "Couldn't %s default route: socket: %m",
1057 cmd=='s'? "add": "delete");
1061 memset(&rtmsg, 0, sizeof(rtmsg));
1062 rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
1063 rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC;
1064 rtmsg.hdr.rtm_version = RTM_VERSION;
1065 rtmsg.hdr.rtm_seq = ++rtm_seq;
1066 rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
1067 rtmsg.dst.sin_len = sizeof(rtmsg.dst);
1068 rtmsg.dst.sin_family = AF_INET;
1069 rtmsg.gway.sin_len = sizeof(rtmsg.gway);
1070 rtmsg.gway.sin_family = AF_INET;
1071 rtmsg.gway.sin_addr.s_addr = g;
1072 rtmsg.mask.sin_len = sizeof(rtmsg.dst);
1073 rtmsg.mask.sin_family = AF_INET;
1075 rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
1076 if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
1077 syslog(LOG_ERR, "Couldn't %s default route: %m",
1078 cmd=='s'? "add": "delete");
1084 default_route_gateway = (cmd == 's')? g: 0;
1088 #if RTM_VERSION >= 3
1091 * sifproxyarp - Make a proxy ARP entry for the peer.
1094 struct rt_msghdr hdr;
1095 struct sockaddr_inarp dst;
1096 struct sockaddr_dl hwa;
1100 static int arpmsg_valid;
1103 sifproxyarp(unit, hisaddr)
1110 * Get the hardware address of an interface on the same subnet
1111 * as our local address.
1113 memset(&arpmsg, 0, sizeof(arpmsg));
1114 if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
1115 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
1119 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1120 syslog(LOG_ERR, "Couldn't add proxy arp entry: socket: %m");
1124 arpmsg.hdr.rtm_type = RTM_ADD;
1125 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
1126 arpmsg.hdr.rtm_version = RTM_VERSION;
1127 arpmsg.hdr.rtm_seq = ++rtm_seq;
1128 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
1129 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
1130 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
1131 arpmsg.dst.sin_family = AF_INET;
1132 arpmsg.dst.sin_addr.s_addr = hisaddr;
1133 arpmsg.dst.sin_other = SIN_PROXY;
1135 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
1136 + arpmsg.hwa.sdl_len;
1137 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1138 syslog(LOG_ERR, "Couldn't add proxy arp entry: %m");
1145 proxy_arp_addr = hisaddr;
1150 * cifproxyarp - Delete the proxy ARP entry for the peer.
1153 cifproxyarp(unit, hisaddr)
1163 arpmsg.hdr.rtm_type = RTM_DELETE;
1164 arpmsg.hdr.rtm_seq = ++rtm_seq;
1166 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
1167 syslog(LOG_ERR, "Couldn't delete proxy arp entry: socket: %m");
1171 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
1172 syslog(LOG_ERR, "Couldn't delete proxy arp entry: %m");
1182 #else /* RTM_VERSION */
1185 * sifproxyarp - Make a proxy ARP entry for the peer.
1188 sifproxyarp(unit, hisaddr)
1192 struct arpreq arpreq;
1194 struct sockaddr_dl sdl;
1198 BZERO(&arpreq, sizeof(arpreq));
1201 * Get the hardware address of an interface on the same subnet
1202 * as our local address.
1204 if (!get_ether_addr(hisaddr, &dls.sdl)) {
1205 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
1209 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
1210 arpreq.arp_ha.sa_family = AF_UNSPEC;
1211 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
1212 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1213 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1214 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
1215 if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
1216 syslog(LOG_ERR, "Couldn't add proxy arp entry: %m");
1220 proxy_arp_addr = hisaddr;
1225 * cifproxyarp - Delete the proxy ARP entry for the peer.
1228 cifproxyarp(unit, hisaddr)
1232 struct arpreq arpreq;
1234 BZERO(&arpreq, sizeof(arpreq));
1235 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
1236 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
1237 if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
1238 syslog(LOG_WARNING, "Couldn't delete proxy arp entry: %m");
1244 #endif /* RTM_VERSION */
1248 * get_ether_addr - get the hardware address of an interface on the
1249 * the same subnet as ipaddr.
1254 get_ether_addr(ipaddr, hwaddr)
1256 struct sockaddr_dl *hwaddr;
1258 struct ifreq *ifr, *ifend, *ifp;
1259 u_int32_t ina, mask;
1260 struct sockaddr_dl *dla;
1263 struct ifreq ifs[MAX_IFS];
1265 ifc.ifc_len = sizeof(ifs);
1267 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1268 syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
1273 * Scan through looking for an interface with an Internet
1274 * address on the same subnet as `ipaddr'.
1276 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1277 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1278 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1279 if (ifr->ifr_addr.sa_family == AF_INET) {
1280 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1281 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1283 * Check that the interface is up, and not point-to-point
1286 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1288 if ((ifreq.ifr_flags &
1289 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
1290 != (IFF_UP|IFF_BROADCAST))
1293 * Get its netmask and check that it's on the right subnet.
1295 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1297 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
1298 if ((ipaddr & mask) != (ina & mask))
1307 syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name);
1310 * Now scan through again looking for a link-level address
1311 * for this interface.
1314 for (ifr = ifc.ifc_req; ifr < ifend; ) {
1315 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
1316 && ifr->ifr_addr.sa_family == AF_LINK) {
1318 * Found the link-level address - copy it out
1320 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
1321 BCOPY(dla, hwaddr, dla->sdl_len);
1324 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
1331 * Return user specified netmask, modified by any mask we might determine
1332 * for address `addr' (in network byte order).
1333 * Here we scan through the system's list of interfaces, looking for
1334 * any non-point-to-point interfaces which might appear to be on the same
1335 * network as `addr'. If we find any, we OR in their netmask to the
1336 * user-specified netmask.
1342 u_int32_t mask, nmask, ina;
1343 struct ifreq *ifr, *ifend, ifreq;
1345 struct ifreq ifs[MAX_IFS];
1348 if (IN_CLASSA(addr)) /* determine network mask for address class */
1349 nmask = IN_CLASSA_NET;
1350 else if (IN_CLASSB(addr))
1351 nmask = IN_CLASSB_NET;
1353 nmask = IN_CLASSC_NET;
1354 /* class D nets are disallowed by bad_ip_adrs */
1355 mask = netmask | htonl(nmask);
1358 * Scan through the system's network interfaces.
1360 ifc.ifc_len = sizeof(ifs);
1362 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1363 syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m");
1366 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1367 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1368 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1370 * Check the interface's internet address.
1372 if (ifr->ifr_addr.sa_family != AF_INET)
1374 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1375 if ((ntohl(ina) & nmask) != (addr & nmask))
1378 * Check that the interface is up, and not point-to-point or loopback.
1380 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1381 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1383 if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
1387 * Get its netmask and OR it into our mask.
1389 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1391 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1398 * Use the hostid as part of the random number seed.
1407 * lock - create a lock file for the named lock device
1409 #define LOCK_PREFIX "/var/spool/lock/LCK.."
1415 char hdb_lock_buffer[12];
1419 if ((p = strrchr(dev, '/')) != NULL)
1421 lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1);
1422 if (lock_file == NULL)
1423 novm("lock file name");
1424 strcat(strcpy(lock_file, LOCK_PREFIX), dev);
1426 while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
1428 && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
1429 /* Read the lock file to find out who has the device locked */
1430 n = read(fd, hdb_lock_buffer, 11);
1432 syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
1435 hdb_lock_buffer[n] = 0;
1436 pid = atoi(hdb_lock_buffer);
1437 if (kill(pid, 0) == -1 && errno == ESRCH) {
1438 /* pid no longer exists - remove the lock file */
1439 if (unlink(lock_file) == 0) {
1441 syslog(LOG_NOTICE, "Removed stale lock on %s (pid %d)",
1445 syslog(LOG_WARNING, "Couldn't remove stale lock on %s",
1448 syslog(LOG_NOTICE, "Device %s is locked by pid %d",
1453 syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file);
1459 sprintf(hdb_lock_buffer, "%10d\n", getpid());
1460 write(fd, hdb_lock_buffer, 11);
1467 * unlock - remove our lockfile