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.
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by Carnegie Mellon University. The name of the
14 * University may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22 static char rcsid[] = "$Id: sys-bsd.c,v 1.19 1995/05/19 03:27:03 paulus Exp $";
36 #include <sys/ioctl.h>
37 #include <sys/types.h>
38 #include <sys/socket.h>
43 #include <net/ppp_defs.h>
44 #include <net/if_ppp.h>
45 #include <net/route.h>
46 #include <net/if_dl.h>
47 #include <netinet/in.h>
50 #include <netinet/if_ether.h>
55 static int initdisc = -1; /* Initial TTY discipline */
58 static int restore_term; /* 1 => we've munged the terminal */
59 static struct termios inittermios; /* Initial TTY termios */
61 static char *lock_file; /* name of lock file created */
63 int sockfd; /* socket for doing interface ioctls */
66 * sys_init - System-dependent initialization.
71 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
72 setlogmask(LOG_UPTO(LOG_INFO));
74 setlogmask(LOG_UPTO(LOG_DEBUG));
76 /* Get an internet socket for doing socket ioctl's on. */
77 if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
78 syslog(LOG_ERR, "Couldn't create IP socket: %m");
84 * note_debug_level - note a change in the debug level.
90 syslog(LOG_INFO, "Debug turned ON, Level %d", debug);
91 setlogmask(LOG_UPTO(LOG_DEBUG));
93 setlogmask(LOG_UPTO(LOG_WARNING));
98 * ppp_available - check whether the system has any ppp interfaces
99 * (in fact we check whether we can do an ioctl on ppp0).
107 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
108 return 1; /* can't tell - maybe we're not root */
110 strncpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name));
111 ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0;
118 * establish_ppp - Turn the serial port into a ppp interface.
123 int pppdisc = PPPDISC;
126 if (ioctl(fd, TIOCGETD, &initdisc) < 0) {
127 syslog(LOG_ERR, "ioctl(TIOCGETD): %m");
130 if (ioctl(fd, TIOCSETD, &pppdisc) < 0) {
131 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
136 * Find out which interface we were given.
138 if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) {
139 syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m");
144 * Enable debug in the driver if requested.
147 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
148 syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m");
150 x |= (kdebugflag & 0xFF) * SC_DEBUG;
151 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
152 syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m");
159 * disestablish_ppp - Restore the serial port to normal operation.
160 * This shouldn't call die() because it's called from die().
170 * Check whether the link seems not to be 8-bit clean.
172 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) {
174 switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) {
176 s = "bit 7 set to 1";
179 s = "bit 7 set to 0";
189 syslog(LOG_WARNING, "Serial link is not 8-bit clean:");
190 syslog(LOG_WARNING, "All received characters had %s", s);
193 if (ioctl(fd, TIOCSETD, &initdisc) < 0)
194 syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
200 * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity,
201 * at the requested speed, etc. If `local' is true, set CLOCAL
202 * regardless of whether the modem option was specified.
204 * For *BSD, we assume that speed_t values numerically equal bits/second.
206 set_up_tty(fd, local)
211 if (tcgetattr(fd, &tios) < 0) {
212 syslog(LOG_ERR, "tcgetattr: %m");
219 tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
221 tios.c_cflag |= CRTSCTS;
222 else if (crtscts < 0)
223 tios.c_cflag &= ~CRTSCTS;
225 tios.c_cflag |= CS8 | CREAD | HUPCL;
227 tios.c_cflag |= CLOCAL;
228 tios.c_iflag = IGNBRK | IGNPAR;
232 tios.c_cc[VTIME] = 0;
235 tios.c_iflag |= IXOFF;
236 tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */
237 tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */
241 cfsetospeed(&tios, inspeed);
242 cfsetispeed(&tios, inspeed);
244 inspeed = cfgetospeed(&tios);
246 * We can't proceed if the serial port speed is 0,
247 * since that implies that the serial port is disabled.
250 syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate",
257 if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
258 syslog(LOG_ERR, "tcsetattr: %m");
266 * restore_tty - restore the terminal to the saved settings.
272 if (!default_device) {
274 * Turn off echoing, because otherwise we can get into
275 * a loop with the tty and the modem echoing to each other.
276 * We presume we are the sole user of this tty device, so
277 * when we close it, it will revert to its defaults anyway.
279 inittermios.c_lflag &= ~(ECHO | ECHONL);
281 if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0)
283 syslog(LOG_WARNING, "tcsetattr: %m");
289 * setdtr - control the DTR line on the serial port.
290 * This is called from die(), so it shouldn't call die().
295 int modembits = TIOCM_DTR;
297 ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits);
302 * output - Output PPP packet.
311 MAINDEBUG((LOG_WARNING, "output: unit != 0!"));
313 log_packet(p, len, "sent ");
315 if (write(fd, p, len) < 0) {
316 syslog(LOG_ERR, "write: %m");
323 * wait_input - wait until there is data available on fd,
324 * for the length of time specified by *timo (indefinite
328 struct timeval *timo;
335 n = select(fd+1, &ready, NULL, &ready, timo);
336 if (n < 0 && errno != EINTR) {
337 syslog(LOG_ERR, "select: %m");
344 * read_packet - get a PPP packet from the serial device.
352 if ((len = read(fd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
353 if (errno == EWOULDBLOCK || errno == EINTR)
355 syslog(LOG_ERR, "read(fd): %m");
363 * ppp_send_config - configure the transmit characteristics of
367 ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
375 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
377 if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) {
378 syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m");
382 if (ioctl(fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) {
383 syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m");
387 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
388 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
391 x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT;
392 x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC;
393 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
394 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
401 * ppp_set_xaccm - set the extended transmit ACCM for the interface.
404 ppp_set_xaccm(unit, accm)
408 if (ioctl(fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY)
409 syslog(LOG_WARNING, "ioctl(set extended ACCM): %m");
414 * ppp_recv_config - configure the receive-side characteristics of
418 ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
425 if (ioctl(fd, PPPIOCSMRU, (caddr_t) &mru) < 0) {
426 syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m");
429 if (ioctl(fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) {
430 syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m");
433 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
434 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
437 x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC;
438 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
439 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
445 * ccp_test - ask kernel whether a given compression method
446 * is acceptable for use.
448 ccp_test(unit, opt_ptr, opt_len, for_transmit)
449 int unit, opt_len, for_transmit;
452 struct ppp_option_data data;
455 data.length = opt_len;
456 data.transmit = for_transmit;
457 return ioctl(fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0;
461 * ccp_flags_set - inform kernel about the current state of CCP.
464 ccp_flags_set(unit, isopen, isup)
465 int unit, isopen, isup;
469 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
470 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
473 x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN;
474 x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP;
475 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0)
476 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
480 * ccp_fatal_error - returns 1 if decompression was disabled as a
481 * result of an error detected after decompression of a packet,
482 * 0 otherwise. This is necessary because of patent nonsense.
485 ccp_fatal_error(unit)
490 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
491 syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m");
494 return x & SC_DC_FERROR;
498 * sifvjcomp - config tcp header compression
501 sifvjcomp(u, vjcomp, cidcomp, maxcid)
502 int u, vjcomp, cidcomp, maxcid;
506 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
507 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
510 x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP;
511 x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID;
512 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
513 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
516 if (ioctl(fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) {
517 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
524 * sifup - Config the interface up and enable IP packets to pass.
527 #define SC_ENABLE_IP 0x100 /* compat for old versions of kernel code */
538 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
539 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
540 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
543 ifr.ifr_flags |= IFF_UP;
544 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
545 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
548 npi.protocol = PPP_IP;
549 npi.mode = NPMODE_PASS;
550 if (ioctl(fd, PPPIOCSNPMODE, &npi) < 0) {
551 if (errno != ENOTTY) {
552 syslog(LOG_ERR, "ioctl(PPPIOCSNPMODE): %m");
555 /* for backwards compatibility */
556 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
557 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
561 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
562 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
570 * sifdown - Config the interface down and disable IP.
582 npi.protocol = PPP_IP;
583 npi.mode = NPMODE_ERROR;
584 if (ioctl(fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) {
585 if (errno != ENOTTY) {
586 syslog(LOG_ERR, "ioctl(PPPIOCSNPMODE): %m");
589 /* backwards compatibility */
590 if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) {
591 syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m");
595 if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) {
596 syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m");
603 strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
604 if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) {
605 syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m");
608 ifr.ifr_flags &= ~IFF_UP;
609 if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) {
610 syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m");
618 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
621 #define SET_SA_FAMILY(addr, family) \
622 BZERO((char *) &(addr), sizeof(addr)); \
623 addr.sa_family = (family); \
624 addr.sa_len = sizeof(addr);
627 * sifaddr - Config the interface IP addresses and netmask.
634 struct ifaliasreq ifra;
636 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
637 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
638 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
639 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
640 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
642 SET_SA_FAMILY(ifra.ifra_mask, AF_INET);
643 ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m;
645 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
646 if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) {
647 if (errno != EEXIST) {
648 syslog(LOG_ERR, "ioctl(SIOCAIFADDR): %m");
651 syslog(LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists");
657 * cifaddr - Clear the interface IP addresses, and delete routes
658 * through the interface if possible.
665 struct ifaliasreq ifra;
667 strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name));
668 SET_SA_FAMILY(ifra.ifra_addr, AF_INET);
669 ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o;
670 SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET);
671 ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h;
672 BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask));
673 if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) {
674 syslog(LOG_WARNING, "ioctl(SIOCDIFADDR): %m");
681 * sifdefaultroute - assign a default route through the address given.
684 sifdefaultroute(u, g)
688 return dodefaultroute(g, 's');
692 * cifdefaultroute - delete a default route through the address given.
695 cifdefaultroute(u, g)
699 return dodefaultroute(g, 'c');
703 * dodefaultroute - talk to a routing socket to add/delete a default route.
706 dodefaultroute(g, cmd)
712 struct rt_msghdr hdr;
713 struct sockaddr_in dst;
714 struct sockaddr_in gway;
715 struct sockaddr_in mask;
718 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
719 syslog(LOG_ERR, "%cifdefaultroute: opening routing socket: %m", cmd);
723 memset(&rtmsg, 0, sizeof(rtmsg));
724 rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE;
725 rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY;
726 rtmsg.hdr.rtm_version = RTM_VERSION;
727 rtmsg.hdr.rtm_seq = ++rtm_seq;
728 rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
729 rtmsg.dst.sin_len = sizeof(rtmsg.dst);
730 rtmsg.dst.sin_family = AF_INET;
731 rtmsg.gway.sin_len = sizeof(rtmsg.gway);
732 rtmsg.gway.sin_family = AF_INET;
733 rtmsg.gway.sin_addr.s_addr = g;
734 rtmsg.mask.sin_len = sizeof(rtmsg.dst);
735 rtmsg.mask.sin_family = AF_INET;
737 rtmsg.hdr.rtm_msglen = sizeof(rtmsg);
738 if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) {
739 syslog(LOG_ERR, "%s default route: %m", cmd=='s'? "add": "delete");
751 * sifproxyarp - Make a proxy ARP entry for the peer.
754 struct rt_msghdr hdr;
755 struct sockaddr_inarp dst;
756 struct sockaddr_dl hwa;
760 static int arpmsg_valid;
763 sifproxyarp(unit, hisaddr)
771 * Get the hardware address of an interface on the same subnet
772 * as our local address.
774 memset(&arpmsg, 0, sizeof(arpmsg));
775 if (!get_ether_addr(hisaddr, &arpmsg.hwa)) {
776 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
780 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
781 syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m");
785 arpmsg.hdr.rtm_type = RTM_ADD;
786 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
787 arpmsg.hdr.rtm_version = RTM_VERSION;
788 arpmsg.hdr.rtm_seq = ++rtm_seq;
789 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
790 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
791 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
792 arpmsg.dst.sin_family = AF_INET;
793 arpmsg.dst.sin_addr.s_addr = hisaddr;
794 arpmsg.dst.sin_other = SIN_PROXY;
796 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
797 + arpmsg.hwa.sdl_len;
798 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
799 syslog(LOG_ERR, "add proxy arp entry: %m");
810 * cifproxyarp - Delete the proxy ARP entry for the peer.
813 cifproxyarp(unit, hisaddr)
823 arpmsg.hdr.rtm_type = RTM_DELETE;
824 arpmsg.hdr.rtm_seq = ++rtm_seq;
826 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
827 syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m");
831 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
832 syslog(LOG_ERR, "delete proxy arp entry: %m");
841 #else /* RTM_VERSION */
844 * sifproxyarp - Make a proxy ARP entry for the peer.
847 sifproxyarp(unit, hisaddr)
851 struct arpreq arpreq;
853 struct sockaddr_dl sdl;
857 BZERO(&arpreq, sizeof(arpreq));
860 * Get the hardware address of an interface on the same subnet
861 * as our local address.
863 if (!get_ether_addr(hisaddr, &dls.sdl)) {
864 syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP");
868 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
869 arpreq.arp_ha.sa_family = AF_UNSPEC;
870 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
871 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
872 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
873 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
874 if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) {
875 syslog(LOG_ERR, "ioctl(SIOCSARP): %m");
883 * cifproxyarp - Delete the proxy ARP entry for the peer.
886 cifproxyarp(unit, hisaddr)
890 struct arpreq arpreq;
892 BZERO(&arpreq, sizeof(arpreq));
893 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
894 ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
895 if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) {
896 syslog(LOG_WARNING, "ioctl(SIOCDARP): %m");
901 #endif /* RTM_VERSION */
905 * get_ether_addr - get the hardware address of an interface on the
906 * the same subnet as ipaddr.
911 get_ether_addr(ipaddr, hwaddr)
913 struct sockaddr_dl *hwaddr;
915 struct ifreq *ifr, *ifend, *ifp;
917 struct sockaddr_dl *dla;
920 struct ifreq ifs[MAX_IFS];
922 ifc.ifc_len = sizeof(ifs);
924 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
925 syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m");
930 * Scan through looking for an interface with an Internet
931 * address on the same subnet as `ipaddr'.
933 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
934 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
935 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
936 if (ifr->ifr_addr.sa_family == AF_INET) {
937 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
938 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
940 * Check that the interface is up, and not point-to-point
943 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
945 if ((ifreq.ifr_flags &
946 (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP))
947 != (IFF_UP|IFF_BROADCAST))
950 * Get its netmask and check that it's on the right subnet.
952 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
954 mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr;
955 if ((ipaddr & mask) != (ina & mask))
964 syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name);
967 * Now scan through again looking for a link-level address
968 * for this interface.
971 for (ifr = ifc.ifc_req; ifr < ifend; ) {
972 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
973 && ifr->ifr_addr.sa_family == AF_LINK) {
975 * Found the link-level address - copy it out
977 dla = (struct sockaddr_dl *) &ifr->ifr_addr;
978 BCOPY(dla, hwaddr, dla->sdl_len);
981 ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len);
988 * Return user specified netmask, modified by any mask we might determine
989 * for address `addr' (in network byte order).
990 * Here we scan through the system's list of interfaces, looking for
991 * any non-point-to-point interfaces which might appear to be on the same
992 * network as `addr'. If we find any, we OR in their netmask to the
993 * user-specified netmask.
999 u_int32_t mask, nmask, ina;
1000 struct ifreq *ifr, *ifend, ifreq;
1002 struct ifreq ifs[MAX_IFS];
1005 if (IN_CLASSA(addr)) /* determine network mask for address class */
1006 nmask = IN_CLASSA_NET;
1007 else if (IN_CLASSB(addr))
1008 nmask = IN_CLASSB_NET;
1010 nmask = IN_CLASSC_NET;
1011 /* class D nets are disallowed by bad_ip_adrs */
1012 mask = netmask | htonl(nmask);
1015 * Scan through the system's network interfaces.
1017 ifc.ifc_len = sizeof(ifs);
1019 if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) {
1020 syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m");
1023 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
1024 for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *)
1025 ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) {
1027 * Check the interface's internet address.
1029 if (ifr->ifr_addr.sa_family != AF_INET)
1031 ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr;
1032 if ((ntohl(ina) & nmask) != (addr & nmask))
1035 * Check that the interface is up, and not point-to-point or loopback.
1037 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
1038 if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0)
1040 if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK))
1044 * Get its netmask and OR it into our mask.
1046 if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0)
1048 mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr;
1055 * lock - create a lock file for the named lock device
1057 #define LOCK_PREFIX "/var/spool/lock/LCK.."
1063 char hdb_lock_buffer[12];
1067 if ((p = strrchr(dev, '/')) != NULL)
1069 lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1);
1070 if (lock_file == NULL)
1071 novm("lock file name");
1072 strcat(strcpy(lock_file, LOCK_PREFIX), dev);
1074 while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) {
1076 && (fd = open(lock_file, O_RDONLY, 0)) >= 0) {
1077 /* Read the lock file to find out who has the device locked */
1078 n = read(fd, hdb_lock_buffer, 11);
1080 hdb_lock_buffer[n] = 0;
1081 pid = atoi(hdb_lock_buffer);
1084 syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file);
1087 if (kill(pid, 0) == -1 && errno == ESRCH) {
1088 /* pid no longer exists - remove the lock file */
1089 if (unlink(lock_file) == 0) {
1091 syslog(LOG_NOTICE, "Removed stale lock on %s (pid %d)",
1095 syslog(LOG_WARNING, "Couldn't remove stale lock on %s",
1098 syslog(LOG_NOTICE, "Device %s is locked by pid %d",
1103 syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file);
1109 sprintf(hdb_lock_buffer, "%10d\n", getpid());
1110 write(fd, hdb_lock_buffer, 11);
1117 * unlock - remove our lockfile