/* * sys-bsd.c - System-dependent procedures for setting up * PPP interfaces on bsd-4.4-ish systems (including 386BSD, NetBSD, etc.) * * Copyright (c) 1989 Carnegie Mellon University. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by Carnegie Mellon University. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #ifndef lint static char rcsid[] = "$Id: sys-bsd.c,v 1.1 1995/10/18 08:48:00 deraadt Exp $"; #endif /* * TODO: */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if RTM_VERSION >= 3 #include #endif #include "pppd.h" static int initdisc = -1; /* Initial TTY discipline */ static int rtm_seq; static int restore_term; /* 1 => we've munged the terminal */ static struct termios inittermios; /* Initial TTY termios */ static struct winsize wsinfo; /* Initial window size info */ static char *lock_file; /* name of lock file created */ int sockfd; /* socket for doing interface ioctls */ /* * sys_init - System-dependent initialization. */ void sys_init() { openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP); setlogmask(LOG_UPTO(LOG_INFO)); if (debug) setlogmask(LOG_UPTO(LOG_DEBUG)); /* Get an internet socket for doing socket ioctl's on. */ if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { syslog(LOG_ERR, "Couldn't create IP socket: %m"); die(1); } } /* * note_debug_level - note a change in the debug level. */ void note_debug_level() { if (debug) { syslog(LOG_INFO, "Debug turned ON, Level %d", debug); setlogmask(LOG_UPTO(LOG_DEBUG)); } else { setlogmask(LOG_UPTO(LOG_WARNING)); } } /* * ppp_available - check whether the system has any ppp interfaces * (in fact we check whether we can do an ioctl on ppp0). */ int ppp_available() { int s, ok; struct ifreq ifr; extern char *no_ppp_msg; if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) return 1; /* can't tell */ strncpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name)); ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0; close(s); no_ppp_msg = "\ This system lacks kernel support for PPP. To include PPP support\n\ in the kernel, please follow the steps detailed in the README.bsd\n\ file in the ppp-2.2 distribution.\n"; return ok; } /* * establish_ppp - Turn the serial port into a ppp interface. */ void establish_ppp() { int pppdisc = PPPDISC; int x; if (ioctl(fd, TIOCGETD, &initdisc) < 0) { syslog(LOG_ERR, "ioctl(TIOCGETD): %m"); die(1); } if (ioctl(fd, TIOCSETD, &pppdisc) < 0) { syslog(LOG_ERR, "ioctl(TIOCSETD): %m"); die(1); } /* * Find out which interface we were given. */ if (ioctl(fd, PPPIOCGUNIT, &ifunit) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCGUNIT): %m"); die(1); } /* * Enable debug in the driver if requested. */ if (kdebugflag) { if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) { syslog(LOG_WARNING, "ioctl (PPPIOCGFLAGS): %m"); } else { x |= (kdebugflag & 0xFF) * SC_DEBUG; if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m"); } } } /* * disestablish_ppp - Restore the serial port to normal operation. * This shouldn't call die() because it's called from die(). */ void disestablish_ppp() { int x; char *s; if (initdisc >= 0) { /* * Check whether the link seems not to be 8-bit clean. */ if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) == 0) { s = NULL; switch (~x & (SC_RCV_B7_0|SC_RCV_B7_1|SC_RCV_EVNP|SC_RCV_ODDP)) { case SC_RCV_B7_0: s = "bit 7 set to 1"; break; case SC_RCV_B7_1: s = "bit 7 set to 0"; break; case SC_RCV_EVNP: s = "odd parity"; break; case SC_RCV_ODDP: s = "even parity"; break; } if (s != NULL) { syslog(LOG_WARNING, "Serial link is not 8-bit clean:"); syslog(LOG_WARNING, "All received characters had %s", s); } } if (ioctl(fd, TIOCSETD, &initdisc) < 0) syslog(LOG_ERR, "ioctl(TIOCSETD): %m"); } } /* * set_up_tty: Set up the serial port on `fd' for 8 bits, no parity, * at the requested speed, etc. If `local' is true, set CLOCAL * regardless of whether the modem option was specified. * * For *BSD, we assume that speed_t values numerically equal bits/second. */ set_up_tty(fd, local) int fd, local; { struct termios tios; if (tcgetattr(fd, &tios) < 0) { syslog(LOG_ERR, "tcgetattr: %m"); die(1); } if (!restore_term) { inittermios = tios; ioctl(fd, TIOCGWINSZ, &wsinfo); } tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL); if (crtscts > 0) tios.c_cflag |= CRTSCTS; else if (crtscts < 0) tios.c_cflag &= ~CRTSCTS; tios.c_cflag |= CS8 | CREAD | HUPCL; if (local || !modem) tios.c_cflag |= CLOCAL; tios.c_iflag = IGNBRK | IGNPAR; tios.c_oflag = 0; tios.c_lflag = 0; tios.c_cc[VMIN] = 1; tios.c_cc[VTIME] = 0; if (crtscts == 2) { tios.c_iflag |= IXOFF; tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */ tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */ } if (inspeed) { cfsetospeed(&tios, inspeed); cfsetispeed(&tios, inspeed); } else { inspeed = cfgetospeed(&tios); /* * We can't proceed if the serial port speed is 0, * since that implies that the serial port is disabled. */ if (inspeed == 0) { syslog(LOG_ERR, "Baud rate for %s is 0; need explicit baud rate", devnam); die(1); } } baud_rate = inspeed; if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) { syslog(LOG_ERR, "tcsetattr: %m"); die(1); } restore_term = 1; } /* * restore_tty - restore the terminal to the saved settings. */ void restore_tty() { if (restore_term) { if (!default_device) { /* * Turn off echoing, because otherwise we can get into * a loop with the tty and the modem echoing to each other. * We presume we are the sole user of this tty device, so * when we close it, it will revert to its defaults anyway. */ inittermios.c_lflag &= ~(ECHO | ECHONL); } if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0) if (errno != ENXIO) syslog(LOG_WARNING, "tcsetattr: %m"); ioctl(fd, TIOCSWINSZ, &wsinfo); restore_term = 0; } } /* * setdtr - control the DTR line on the serial port. * This is called from die(), so it shouldn't call die(). */ setdtr(fd, on) int fd, on; { int modembits = TIOCM_DTR; ioctl(fd, (on? TIOCMBIS: TIOCMBIC), &modembits); } /* * output - Output PPP packet. */ void output(unit, p, len) int unit; u_char *p; int len; { if (unit != 0) MAINDEBUG((LOG_WARNING, "output: unit != 0!")); if (debug) log_packet(p, len, "sent "); if (write(fd, p, len) < 0) { syslog(LOG_ERR, "write: %m"); die(1); } } /* * wait_input - wait until there is data available on fd, * for the length of time specified by *timo (indefinite * if timo is NULL). */ wait_input(timo) struct timeval *timo; { fd_set ready; int n; FD_ZERO(&ready); FD_SET(fd, &ready); n = select(fd+1, &ready, NULL, &ready, timo); if (n < 0 && errno != EINTR) { syslog(LOG_ERR, "select: %m"); die(1); } } /* * read_packet - get a PPP packet from the serial device. */ int read_packet(buf) u_char *buf; { int len; if ((len = read(fd, buf, PPP_MTU + PPP_HDRLEN)) < 0) { if (errno == EWOULDBLOCK || errno == EINTR) return -1; syslog(LOG_ERR, "read(fd): %m"); die(1); } return len; } /* * ppp_send_config - configure the transmit characteristics of * the ppp interface. */ void ppp_send_config(unit, mtu, asyncmap, pcomp, accomp) int unit, mtu; u_int32_t asyncmap; int pcomp, accomp; { u_int x; struct ifreq ifr; strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); ifr.ifr_mtu = mtu; if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m"); quit(); } if (ioctl(fd, PPPIOCSASYNCMAP, (caddr_t) &asyncmap) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCSASYNCMAP): %m"); quit(); } if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) { syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m"); quit(); } x = pcomp? x | SC_COMP_PROT: x &~ SC_COMP_PROT; x = accomp? x | SC_COMP_AC: x &~ SC_COMP_AC; if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m"); quit(); } } /* * ppp_set_xaccm - set the extended transmit ACCM for the interface. */ void ppp_set_xaccm(unit, accm) int unit; ext_accm accm; { if (ioctl(fd, PPPIOCSXASYNCMAP, accm) < 0 && errno != ENOTTY) syslog(LOG_WARNING, "ioctl(set extended ACCM): %m"); } /* * ppp_recv_config - configure the receive-side characteristics of * the ppp interface. */ void ppp_recv_config(unit, mru, asyncmap, pcomp, accomp) int unit, mru; u_int32_t asyncmap; int pcomp, accomp; { int x; if (ioctl(fd, PPPIOCSMRU, (caddr_t) &mru) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCSMRU): %m"); quit(); } if (ioctl(fd, PPPIOCSRASYNCMAP, (caddr_t) &asyncmap) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCSRASYNCMAP): %m"); quit(); } if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) { syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m"); quit(); } x = !accomp? x | SC_REJ_COMP_AC: x &~ SC_REJ_COMP_AC; if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m"); quit(); } } /* * ccp_test - ask kernel whether a given compression method * is acceptable for use. */ ccp_test(unit, opt_ptr, opt_len, for_transmit) int unit, opt_len, for_transmit; u_char *opt_ptr; { struct ppp_option_data data; data.ptr = opt_ptr; data.length = opt_len; data.transmit = for_transmit; return ioctl(fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0; } /* * ccp_flags_set - inform kernel about the current state of CCP. */ void ccp_flags_set(unit, isopen, isup) int unit, isopen, isup; { int x; if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) { syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m"); return; } x = isopen? x | SC_CCP_OPEN: x &~ SC_CCP_OPEN; x = isup? x | SC_CCP_UP: x &~ SC_CCP_UP; if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m"); } /* * ccp_fatal_error - returns 1 if decompression was disabled as a * result of an error detected after decompression of a packet, * 0 otherwise. This is necessary because of patent nonsense. */ int ccp_fatal_error(unit) int unit; { int x; if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCGFLAGS): %m"); return 0; } return x & SC_DC_FERROR; } /* * sifvjcomp - config tcp header compression */ int sifvjcomp(u, vjcomp, cidcomp, maxcid) int u, vjcomp, cidcomp, maxcid; { u_int x; if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) { syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m"); return 0; } x = vjcomp ? x | SC_COMP_TCP: x &~ SC_COMP_TCP; x = cidcomp? x & ~SC_NO_TCP_CCID: x | SC_NO_TCP_CCID; if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m"); return 0; } if (ioctl(fd, PPPIOCSMAXCID, (caddr_t) &maxcid) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m"); return 0; } return 1; } /* * sifup - Config the interface up and enable IP packets to pass. */ #ifndef SC_ENABLE_IP #define SC_ENABLE_IP 0x100 /* compat for old versions of kernel code */ #endif int sifup(u) int u; { struct ifreq ifr; u_int x; struct npioctl npi; strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) { syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m"); return 0; } ifr.ifr_flags |= IFF_UP; if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m"); return 0; } npi.protocol = PPP_IP; npi.mode = NPMODE_PASS; if (ioctl(fd, PPPIOCSNPMODE, &npi) < 0) { if (errno != ENOTTY) { syslog(LOG_ERR, "ioctl(PPPIOCSNPMODE): %m"); return 0; } /* for backwards compatibility */ if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) { syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m"); return 0; } x |= SC_ENABLE_IP; if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m"); return 0; } } return 1; } /* * sifdown - Config the interface down and disable IP. */ int sifdown(u) int u; { struct ifreq ifr; u_int x; int rv; struct npioctl npi; rv = 1; npi.protocol = PPP_IP; npi.mode = NPMODE_ERROR; if (ioctl(fd, PPPIOCSNPMODE, (caddr_t) &npi) < 0) { if (errno != ENOTTY) { syslog(LOG_ERR, "ioctl(PPPIOCSNPMODE): %m"); rv = 0; } else { /* backwards compatibility */ if (ioctl(fd, PPPIOCGFLAGS, (caddr_t) &x) < 0) { syslog(LOG_ERR, "ioctl (PPPIOCGFLAGS): %m"); rv = 0; } else { x &= ~SC_ENABLE_IP; if (ioctl(fd, PPPIOCSFLAGS, (caddr_t) &x) < 0) { syslog(LOG_ERR, "ioctl(PPPIOCSFLAGS): %m"); rv = 0; } } } } strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) { syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m"); rv = 0; } else { ifr.ifr_flags &= ~IFF_UP; if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m"); rv = 0; } } return rv; } /* * SET_SA_FAMILY - set the sa_family field of a struct sockaddr, * if it exists. */ #define SET_SA_FAMILY(addr, family) \ BZERO((char *) &(addr), sizeof(addr)); \ addr.sa_family = (family); \ addr.sa_len = sizeof(addr); /* * sifaddr - Config the interface IP addresses and netmask. */ int sifaddr(u, o, h, m) int u; u_int32_t o, h, m; { struct ifaliasreq ifra; strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name)); SET_SA_FAMILY(ifra.ifra_addr, AF_INET); ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o; SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET); ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h; if (m != 0) { SET_SA_FAMILY(ifra.ifra_mask, AF_INET); ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m; } else BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask)); if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) { if (errno != EEXIST) { syslog(LOG_ERR, "ioctl(SIOCAIFADDR): %m"); return 0; } syslog(LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists"); } return 1; } /* * cifaddr - Clear the interface IP addresses, and delete routes * through the interface if possible. */ int cifaddr(u, o, h) int u; u_int32_t o, h; { struct ifaliasreq ifra; strncpy(ifra.ifra_name, ifname, sizeof(ifra.ifra_name)); SET_SA_FAMILY(ifra.ifra_addr, AF_INET); ((struct sockaddr_in *) &ifra.ifra_addr)->sin_addr.s_addr = o; SET_SA_FAMILY(ifra.ifra_broadaddr, AF_INET); ((struct sockaddr_in *) &ifra.ifra_broadaddr)->sin_addr.s_addr = h; BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask)); if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) { syslog(LOG_WARNING, "ioctl(SIOCDIFADDR): %m"); return 0; } return 1; } /* * sifdefaultroute - assign a default route through the address given. */ int sifdefaultroute(u, g) int u; u_int32_t g; { return dodefaultroute(g, 's'); } /* * cifdefaultroute - delete a default route through the address given. */ int cifdefaultroute(u, g) int u; u_int32_t g; { return dodefaultroute(g, 'c'); } /* * dodefaultroute - talk to a routing socket to add/delete a default route. */ int dodefaultroute(g, cmd) u_int32_t g; int cmd; { int routes; struct { struct rt_msghdr hdr; struct sockaddr_in dst; struct sockaddr_in gway; struct sockaddr_in mask; } rtmsg; if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) { syslog(LOG_ERR, "%cifdefaultroute: opening routing socket: %m", cmd); return 0; } memset(&rtmsg, 0, sizeof(rtmsg)); rtmsg.hdr.rtm_type = cmd == 's'? RTM_ADD: RTM_DELETE; rtmsg.hdr.rtm_flags = RTF_UP | RTF_GATEWAY; rtmsg.hdr.rtm_version = RTM_VERSION; rtmsg.hdr.rtm_seq = ++rtm_seq; rtmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK; rtmsg.dst.sin_len = sizeof(rtmsg.dst); rtmsg.dst.sin_family = AF_INET; rtmsg.gway.sin_len = sizeof(rtmsg.gway); rtmsg.gway.sin_family = AF_INET; rtmsg.gway.sin_addr.s_addr = g; rtmsg.mask.sin_len = sizeof(rtmsg.dst); rtmsg.mask.sin_family = AF_INET; rtmsg.hdr.rtm_msglen = sizeof(rtmsg); if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) { syslog(LOG_ERR, "%s default route: %m", cmd=='s'? "add": "delete"); close(routes); return 0; } close(routes); return 1; } #if RTM_VERSION >= 3 /* * sifproxyarp - Make a proxy ARP entry for the peer. */ static struct { struct rt_msghdr hdr; struct sockaddr_inarp dst; struct sockaddr_dl hwa; char extra[128]; } arpmsg; static int arpmsg_valid; int sifproxyarp(unit, hisaddr) int unit; u_int32_t hisaddr; { int routes; int l; /* * Get the hardware address of an interface on the same subnet * as our local address. */ memset(&arpmsg, 0, sizeof(arpmsg)); if (!get_ether_addr(hisaddr, &arpmsg.hwa)) { syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP"); return 0; } if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) { syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m"); return 0; } arpmsg.hdr.rtm_type = RTM_ADD; arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC; arpmsg.hdr.rtm_version = RTM_VERSION; arpmsg.hdr.rtm_seq = ++rtm_seq; arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY; arpmsg.hdr.rtm_inits = RTV_EXPIRE; arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp); arpmsg.dst.sin_family = AF_INET; arpmsg.dst.sin_addr.s_addr = hisaddr; arpmsg.dst.sin_other = SIN_PROXY; arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg + arpmsg.hwa.sdl_len; if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) { syslog(LOG_ERR, "add proxy arp entry: %m"); close(routes); return 0; } close(routes); arpmsg_valid = 1; return 1; } /* * cifproxyarp - Delete the proxy ARP entry for the peer. */ int cifproxyarp(unit, hisaddr) int unit; u_int32_t hisaddr; { int routes; if (!arpmsg_valid) return 0; arpmsg_valid = 0; arpmsg.hdr.rtm_type = RTM_DELETE; arpmsg.hdr.rtm_seq = ++rtm_seq; if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) { syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m"); return 0; } if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) { syslog(LOG_ERR, "delete proxy arp entry: %m"); close(routes); return 0; } close(routes); return 1; } #else /* RTM_VERSION */ /* * sifproxyarp - Make a proxy ARP entry for the peer. */ int sifproxyarp(unit, hisaddr) int unit; u_int32_t hisaddr; { struct arpreq arpreq; struct { struct sockaddr_dl sdl; char space[128]; } dls; BZERO(&arpreq, sizeof(arpreq)); /* * Get the hardware address of an interface on the same subnet * as our local address. */ if (!get_ether_addr(hisaddr, &dls.sdl)) { syslog(LOG_ERR, "Cannot determine ethernet address for proxy ARP"); return 0; } arpreq.arp_ha.sa_len = sizeof(struct sockaddr); arpreq.arp_ha.sa_family = AF_UNSPEC; BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen); SET_SA_FAMILY(arpreq.arp_pa, AF_INET); ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr; arpreq.arp_flags = ATF_PERM | ATF_PUBL; if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) { syslog(LOG_ERR, "ioctl(SIOCSARP): %m"); return 0; } return 1; } /* * cifproxyarp - Delete the proxy ARP entry for the peer. */ int cifproxyarp(unit, hisaddr) int unit; u_int32_t hisaddr; { struct arpreq arpreq; BZERO(&arpreq, sizeof(arpreq)); SET_SA_FAMILY(arpreq.arp_pa, AF_INET); ((struct sockaddr_in *) &arpreq.arp_pa)->sin_addr.s_addr = hisaddr; if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) { syslog(LOG_WARNING, "ioctl(SIOCDARP): %m"); return 0; } return 1; } #endif /* RTM_VERSION */ /* * get_ether_addr - get the hardware address of an interface on the * the same subnet as ipaddr. */ #define MAX_IFS 32 int get_ether_addr(ipaddr, hwaddr) u_int32_t ipaddr; struct sockaddr_dl *hwaddr; { struct ifreq *ifr, *ifend, *ifp; u_int32_t ina, mask; struct sockaddr_dl *dla; struct ifreq ifreq; struct ifconf ifc; struct ifreq ifs[MAX_IFS]; ifc.ifc_len = sizeof(ifs); ifc.ifc_req = ifs; if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) { syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m"); return 0; } /* * Scan through looking for an interface with an Internet * address on the same subnet as `ipaddr'. */ ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) { if (ifr->ifr_addr.sa_family == AF_INET) { ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr; strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name)); /* * Check that the interface is up, and not point-to-point * or loopback. */ if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0) continue; if ((ifreq.ifr_flags & (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP)) != (IFF_UP|IFF_BROADCAST)) continue; /* * Get its netmask and check that it's on the right subnet. */ if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0) continue; mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr; if ((ipaddr & mask) != (ina & mask)) continue; break; } } if (ifr >= ifend) return 0; syslog(LOG_INFO, "found interface %s for proxy arp", ifr->ifr_name); /* * Now scan through again looking for a link-level address * for this interface. */ ifp = ifr; for (ifr = ifc.ifc_req; ifr < ifend; ) { if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0 && ifr->ifr_addr.sa_family == AF_LINK) { /* * Found the link-level address - copy it out */ dla = (struct sockaddr_dl *) &ifr->ifr_addr; BCOPY(dla, hwaddr, dla->sdl_len); return 1; } ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len); } return 0; } /* * Return user specified netmask, modified by any mask we might determine * for address `addr' (in network byte order). * Here we scan through the system's list of interfaces, looking for * any non-point-to-point interfaces which might appear to be on the same * network as `addr'. If we find any, we OR in their netmask to the * user-specified netmask. */ u_int32_t GetMask(addr) u_int32_t addr; { u_int32_t mask, nmask, ina; struct ifreq *ifr, *ifend, ifreq; struct ifconf ifc; struct ifreq ifs[MAX_IFS]; addr = ntohl(addr); if (IN_CLASSA(addr)) /* determine network mask for address class */ nmask = IN_CLASSA_NET; else if (IN_CLASSB(addr)) nmask = IN_CLASSB_NET; else nmask = IN_CLASSC_NET; /* class D nets are disallowed by bad_ip_adrs */ mask = netmask | htonl(nmask); /* * Scan through the system's network interfaces. */ ifc.ifc_len = sizeof(ifs); ifc.ifc_req = ifs; if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) { syslog(LOG_WARNING, "ioctl(SIOCGIFCONF): %m"); return mask; } ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); for (ifr = ifc.ifc_req; ifr < ifend; ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len)) { /* * Check the interface's internet address. */ if (ifr->ifr_addr.sa_family != AF_INET) continue; ina = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr; if ((ntohl(ina) & nmask) != (addr & nmask)) continue; /* * Check that the interface is up, and not point-to-point or loopback. */ strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name)); if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0) continue; if ((ifreq.ifr_flags & (IFF_UP|IFF_POINTOPOINT|IFF_LOOPBACK)) != IFF_UP) continue; /* * Get its netmask and OR it into our mask. */ if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0) continue; mask |= ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr.s_addr; } return mask; } /* * lock - create a lock file for the named lock device */ #define LOCK_PREFIX "/var/spool/lock/LCK.." int lock(dev) char *dev; { char hdb_lock_buffer[12]; int fd, pid, n; char *p; if ((p = strrchr(dev, '/')) != NULL) dev = p + 1; lock_file = malloc(strlen(LOCK_PREFIX) + strlen(dev) + 1); if (lock_file == NULL) novm("lock file name"); strcat(strcpy(lock_file, LOCK_PREFIX), dev); while ((fd = open(lock_file, O_EXCL | O_CREAT | O_RDWR, 0644)) < 0) { if (errno == EEXIST && (fd = open(lock_file, O_RDONLY, 0)) >= 0) { /* Read the lock file to find out who has the device locked */ n = read(fd, hdb_lock_buffer, 11); if (n > 0) { hdb_lock_buffer[n] = 0; pid = atoi(hdb_lock_buffer); } if (n <= 0) { syslog(LOG_ERR, "Can't read pid from lock file %s", lock_file); close(fd); } else { if (kill(pid, 0) == -1 && errno == ESRCH) { /* pid no longer exists - remove the lock file */ if (unlink(lock_file) == 0) { close(fd); syslog(LOG_NOTICE, "Removed stale lock on %s (pid %d)", dev, pid); continue; } else syslog(LOG_WARNING, "Couldn't remove stale lock on %s", dev); } else syslog(LOG_NOTICE, "Device %s is locked by pid %d", dev, pid); } close(fd); } else syslog(LOG_ERR, "Can't create lock file %s: %m", lock_file); free(lock_file); lock_file = NULL; return -1; } sprintf(hdb_lock_buffer, "%10d\n", getpid()); write(fd, hdb_lock_buffer, 11); close(fd); return 0; } /* * unlock - remove our lockfile */ unlock() { if (lock_file) { unlink(lock_file); free(lock_file); lock_file = NULL; } }