X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Fsys-bsd.c;h=14e517a4e7be1e03a385b1957a96054a0510593a;hp=df9dfba3f11c0bcda4448bba77ec19c9fb6d82e3;hb=dee72905271845128ad26cff5cf770c433f3f4a7;hpb=61443cfc407bf7a4a7a3b205a1912be55f277ac1 diff --git a/pppd/sys-bsd.c b/pppd/sys-bsd.c index df9dfba..14e517a 100644 --- a/pppd/sys-bsd.c +++ b/pppd/sys-bsd.c @@ -19,22 +19,28 @@ */ #ifndef lint -static char rcsid[] = "$Id: sys-bsd.c,v 1.12 1994/09/16 02:35:27 paulus Exp $"; +static char rcsid[] = "$Id: sys-bsd.c,v 1.22 1995/10/27 03:46:27 paulus Exp $"; #endif /* * TODO: */ +#include #include +#include +#include +#include +#include #include #include #include #include #include -#include +#include #include +#include #include #include #include @@ -45,13 +51,28 @@ static char rcsid[] = "$Id: sys-bsd.c,v 1.12 1994/09/16 02:35:27 paulus Exp $"; #endif #include "pppd.h" -#include "ppp.h" static int initdisc = -1; /* Initial TTY discipline */ +static int initfdflags = -1; /* Initial file descriptor flags for fd */ + static int rtm_seq; -static int restore_term; /* 1 => we've munged the terminal */ +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 */ + +static int sockfd; /* socket for doing interface ioctls */ + +static int if_is_up; /* the interface is currently up */ +static u_int32_t default_route_gateway; /* gateway addr for default route */ +static u_int32_t proxy_arp_addr; /* remote addr for proxy arp */ + +/* Prototypes for procedures local to this file. */ +static int dodefaultroute __P((u_int32_t, int)); +static int get_ether_addr __P((u_int32_t, struct sockaddr_dl *)); + /* * sys_init - System-dependent initialization. @@ -63,6 +84,37 @@ sys_init() 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); + } +} + +/* + * sys_cleanup - restore any system state we modified before exiting: + * mark the interface down, delete default route and/or proxy arp entry. + * This should call die() because it's called from die(). + */ +void +sys_cleanup() +{ + struct ifreq ifr; + + if (if_is_up) { + strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); + if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) >= 0 + && ((ifr.ifr_flags & IFF_UP) != 0)) { + ifr.ifr_flags &= ~IFF_UP; + ioctl(sockfd, SIOCSIFFLAGS, &ifr); + } + } + + if (default_route_gateway) + cifdefaultroute(0, default_route_gateway); + if (proxy_arp_addr) + cifproxyarp(0, proxy_arp_addr); } /* @@ -88,14 +140,19 @@ 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 - maybe we're not root */ + 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; } @@ -137,6 +194,14 @@ establish_ppp() syslog(LOG_WARNING, "ioctl(PPPIOCSFLAGS): %m"); } } + + /* + * Set device for non-blocking reads. + */ + if ((initfdflags = fcntl(fd, F_GETFL)) == -1 + || fcntl(fd, F_SETFL, initfdflags | O_NONBLOCK) == -1) { + syslog(LOG_WARNING, "Couldn't set device to non-blocking mode: %m"); + } } @@ -150,6 +215,11 @@ disestablish_ppp() int x; char *s; + /* Reset non-blocking mode on the file descriptor. */ + if (initfdflags != -1 && fcntl(fd, F_SETFL, initfdflags) < 0) + syslog(LOG_WARNING, "Couldn't restore device fd flags: %m"); + initfdflags = -1; + if (initdisc >= 0) { /* * Check whether the link seems not to be 8-bit clean. @@ -188,6 +258,7 @@ disestablish_ppp() * * For *BSD, we assume that speed_t values numerically equal bits/second. */ +void set_up_tty(fd, local) int fd, local; { @@ -198,11 +269,13 @@ set_up_tty(fd, local) die(1); } - if (!restore_term) + if (!restore_term) { inittermios = tios; + ioctl(fd, TIOCGWINSZ, &wsinfo); + } tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL); - if (crtscts > 0) + if (crtscts > 0 && !local) tios.c_cflag |= CRTSCTS; else if (crtscts < 0) tios.c_cflag &= ~CRTSCTS; @@ -216,8 +289,8 @@ set_up_tty(fd, local) tios.c_cc[VMIN] = 1; tios.c_cc[VTIME] = 0; - if (crtscts == 2) { - tios.c_iflag |= IXOFF; + if (crtscts == -2) { + tios.c_iflag |= IXON | IXOFF; tios.c_cc[VSTOP] = 0x13; /* DC3 = XOFF = ^S */ tios.c_cc[VSTART] = 0x11; /* DC1 = XON = ^Q */ } @@ -254,9 +327,19 @@ 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; } } @@ -265,6 +348,7 @@ restore_tty() * setdtr - control the DTR line on the serial port. * This is called from die(), so it shouldn't call die(). */ +void setdtr(fd, on) int fd, on; { @@ -283,14 +367,12 @@ output(unit, p, len) 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); + if (errno != EIO) + syslog(LOG_ERR, "write: %m"); } } @@ -300,6 +382,7 @@ output(unit, p, len) * for the length of time specified by *timo (indefinite * if timo is NULL). */ +void wait_input(timo) struct timeval *timo; { @@ -325,11 +408,9 @@ read_packet(buf) { int len; - if ((len = read(fd, buf, MTU + DLLHEADERLEN)) < 0) { - if (errno == EWOULDBLOCK) { - MAINDEBUG((LOG_DEBUG, "read(fd): EWOULDBLOCK")); + 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); } @@ -344,7 +425,7 @@ read_packet(buf) void ppp_send_config(unit, mtu, asyncmap, pcomp, accomp) int unit, mtu; - uint32 asyncmap; + u_int32_t asyncmap; int pcomp, accomp; { u_int x; @@ -352,7 +433,7 @@ ppp_send_config(unit, mtu, asyncmap, pcomp, accomp) strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); ifr.ifr_mtu = mtu; - if (ioctl(s, SIOCSIFMTU, (caddr_t) &ifr) < 0) { + if (ioctl(sockfd, SIOCSIFMTU, (caddr_t) &ifr) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFMTU): %m"); quit(); } @@ -395,7 +476,7 @@ ppp_set_xaccm(unit, accm) void ppp_recv_config(unit, mru, asyncmap, pcomp, accomp) int unit, mru; - uint32 asyncmap; + u_int32_t asyncmap; int pcomp, accomp; { int x; @@ -421,8 +502,11 @@ ppp_recv_config(unit, mru, asyncmap, pcomp, accomp) /* * ccp_test - ask kernel whether a given compression method - * is acceptable for use. + * is acceptable for use. Returns 1 if the method and parameters + * are OK, 0 if the method is known but the parameters are not OK + * (e.g. code size should be reduced), or -1 if the method is unknown. */ +int ccp_test(unit, opt_ptr, opt_len, for_transmit) int unit, opt_len, for_transmit; u_char *opt_ptr; @@ -432,7 +516,9 @@ ccp_test(unit, opt_ptr, opt_len, for_transmit) data.ptr = opt_ptr; data.length = opt_len; data.transmit = for_transmit; - return ioctl(fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0; + if (ioctl(fd, PPPIOCSCOMPRESS, (caddr_t) &data) >= 0) + return 1; + return (errno == ENOBUFS)? 0: -1; } /* @@ -501,6 +587,10 @@ sifvjcomp(u, vjcomp, cidcomp, maxcid) /* * 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; @@ -510,15 +600,16 @@ sifup(u) struct npioctl npi; strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); - if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) { + if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) { syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m"); return 0; } ifr.ifr_flags |= IFF_UP; - if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) { + if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m"); return 0; } + if_is_up = 1; npi.protocol = PPP_IP; npi.mode = NPMODE_PASS; if (ioctl(fd, PPPIOCSNPMODE, &npi) < 0) { @@ -575,15 +666,16 @@ sifdown(u) } strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name)); - if (ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) { + if (ioctl(sockfd, SIOCGIFFLAGS, (caddr_t) &ifr) < 0) { syslog(LOG_ERR, "ioctl (SIOCGIFFLAGS): %m"); rv = 0; } else { ifr.ifr_flags &= ~IFF_UP; - if (ioctl(s, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) { + if (ioctl(sockfd, SIOCSIFFLAGS, (caddr_t) &ifr) < 0) { syslog(LOG_ERR, "ioctl(SIOCSIFFLAGS): %m"); rv = 0; - } + } else + if_is_up = 0; } return rv; } @@ -603,7 +695,7 @@ sifdown(u) int sifaddr(u, o, h, m) int u; - uint32 o, h, m; + u_int32_t o, h, m; { struct ifaliasreq ifra; @@ -617,12 +709,13 @@ sifaddr(u, o, h, m) ((struct sockaddr_in *) &ifra.ifra_mask)->sin_addr.s_addr = m; } else BZERO(&ifra.ifra_mask, sizeof(ifra.ifra_mask)); - if (ioctl(s, SIOCAIFADDR, (caddr_t) &ifra) < 0) { + if (ioctl(sockfd, SIOCAIFADDR, (caddr_t) &ifra) < 0) { if (errno != EEXIST) { - syslog(LOG_ERR, "ioctl(SIOCAIFADDR): %m"); + syslog(LOG_ERR, "Couldn't set interface address: %m"); return 0; } - syslog(LOG_WARNING, "ioctl(SIOCAIFADDR): Address already exists"); + syslog(LOG_WARNING, + "Couldn't set interface address: Address already exists"); } return 1; } @@ -634,7 +727,7 @@ sifaddr(u, o, h, m) int cifaddr(u, o, h) int u; - uint32 o, h; + u_int32_t o, h; { struct ifaliasreq ifra; @@ -644,8 +737,8 @@ cifaddr(u, o, h) 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(s, SIOCDIFADDR, (caddr_t) &ifra) < 0) { - syslog(LOG_WARNING, "ioctl(SIOCDIFADDR): %m"); + if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) { + syslog(LOG_WARNING, "Couldn't delete interface address: %m"); return 0; } return 1; @@ -657,7 +750,7 @@ cifaddr(u, o, h) int sifdefaultroute(u, g) int u; - uint32 g; + u_int32_t g; { return dodefaultroute(g, 's'); } @@ -668,7 +761,7 @@ sifdefaultroute(u, g) int cifdefaultroute(u, g) int u; - uint32 g; + u_int32_t g; { return dodefaultroute(g, 'c'); } @@ -676,9 +769,9 @@ cifdefaultroute(u, g) /* * dodefaultroute - talk to a routing socket to add/delete a default route. */ -int +static int dodefaultroute(g, cmd) - uint32 g; + u_int32_t g; int cmd; { int routes; @@ -690,7 +783,8 @@ dodefaultroute(g, cmd) } rtmsg; if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) { - syslog(LOG_ERR, "%cifdefaultroute: opening routing socket: %m", cmd); + syslog(LOG_ERR, "Couldn't %s default route: socket: %m", + cmd=='s'? "add": "delete"); return 0; } @@ -710,12 +804,14 @@ dodefaultroute(g, cmd) rtmsg.hdr.rtm_msglen = sizeof(rtmsg); if (write(routes, &rtmsg, sizeof(rtmsg)) < 0) { - syslog(LOG_ERR, "%s default route: %m", cmd=='s'? "add": "delete"); + syslog(LOG_ERR, "Couldn't %s default route: %m", + cmd=='s'? "add": "delete"); close(routes); return 0; } close(routes); + default_route_gateway = (cmd == 's')? g: 0; return 1; } @@ -736,7 +832,7 @@ static int arpmsg_valid; int sifproxyarp(unit, hisaddr) int unit; - uint32 hisaddr; + u_int32_t hisaddr; { int routes; int l; @@ -752,7 +848,7 @@ sifproxyarp(unit, hisaddr) } if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) { - syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m"); + syslog(LOG_ERR, "Couldn't add proxy arp entry: socket: %m"); return 0; } @@ -770,13 +866,14 @@ sifproxyarp(unit, hisaddr) 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"); + syslog(LOG_ERR, "Couldn't add proxy arp entry: %m"); close(routes); return 0; } close(routes); arpmsg_valid = 1; + proxy_arp_addr = hisaddr; return 1; } @@ -786,7 +883,7 @@ sifproxyarp(unit, hisaddr) int cifproxyarp(unit, hisaddr) int unit; - uint32 hisaddr; + u_int32_t hisaddr; { int routes; @@ -798,17 +895,18 @@ cifproxyarp(unit, hisaddr) arpmsg.hdr.rtm_seq = ++rtm_seq; if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) { - syslog(LOG_ERR, "sifproxyarp: opening routing socket: %m"); + syslog(LOG_ERR, "Couldn't delete proxy arp entry: socket: %m"); return 0; } if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) { - syslog(LOG_ERR, "delete proxy arp entry: %m"); + syslog(LOG_ERR, "Couldn't delete proxy arp entry: %m"); close(routes); return 0; } close(routes); + proxy_arp_addr = 0; return 1; } @@ -820,7 +918,7 @@ cifproxyarp(unit, hisaddr) int sifproxyarp(unit, hisaddr) int unit; - uint32 hisaddr; + u_int32_t hisaddr; { struct arpreq arpreq; struct { @@ -845,11 +943,12 @@ sifproxyarp(unit, hisaddr) 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(s, SIOCSARP, (caddr_t)&arpreq) < 0) { - syslog(LOG_ERR, "ioctl(SIOCSARP): %m"); + if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) { + syslog(LOG_ERR, "Couldn't add proxy arp entry: %m"); return 0; } + proxy_arp_addr = hisaddr; return 1; } @@ -859,17 +958,18 @@ sifproxyarp(unit, hisaddr) int cifproxyarp(unit, hisaddr) int unit; - uint32 hisaddr; + 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(s, SIOCDARP, (caddr_t)&arpreq) < 0) { - syslog(LOG_WARNING, "ioctl(SIOCDARP): %m"); + if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) { + syslog(LOG_WARNING, "Couldn't delete proxy arp entry: %m"); return 0; } + proxy_arp_addr = 0; return 1; } #endif /* RTM_VERSION */ @@ -881,13 +981,13 @@ cifproxyarp(unit, hisaddr) */ #define MAX_IFS 32 -int +static int get_ether_addr(ipaddr, hwaddr) - uint32 ipaddr; + u_int32_t ipaddr; struct sockaddr_dl *hwaddr; { struct ifreq *ifr, *ifend, *ifp; - uint32 ina, mask; + u_int32_t ina, mask; struct sockaddr_dl *dla; struct ifreq ifreq; struct ifconf ifc; @@ -895,7 +995,7 @@ get_ether_addr(ipaddr, hwaddr) ifc.ifc_len = sizeof(ifs); ifc.ifc_req = ifs; - if (ioctl(s, SIOCGIFCONF, &ifc) < 0) { + if (ioctl(sockfd, SIOCGIFCONF, &ifc) < 0) { syslog(LOG_ERR, "ioctl(SIOCGIFCONF): %m"); return 0; } @@ -905,7 +1005,8 @@ get_ether_addr(ipaddr, hwaddr) * address on the same subnet as `ipaddr'. */ ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); - for (ifr = ifc.ifc_req; ifr < ifend; ) { + 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)); @@ -913,7 +1014,7 @@ get_ether_addr(ipaddr, hwaddr) * Check that the interface is up, and not point-to-point * or loopback. */ - if (ioctl(s, SIOCGIFFLAGS, &ifreq) < 0) + if (ioctl(sockfd, SIOCGIFFLAGS, &ifreq) < 0) continue; if ((ifreq.ifr_flags & (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK|IFF_NOARP)) @@ -922,15 +1023,14 @@ get_ether_addr(ipaddr, hwaddr) /* * Get its netmask and check that it's on the right subnet. */ - if (ioctl(s, SIOCGIFNETMASK, &ifreq) < 0) + if (ioctl(sockfd, SIOCGIFNETMASK, &ifreq) < 0) continue; - mask = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr; + mask = ((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr; if ((ipaddr & mask) != (ina & mask)) continue; break; } - ifr = (struct ifreq *) ((char *)&ifr->ifr_addr + ifr->ifr_addr.sa_len); } if (ifr >= ifend) @@ -957,3 +1057,145 @@ get_ether_addr(ipaddr, hwaddr) 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 + */ +void +unlock() +{ + if (lock_file) { + unlink(lock_file); + free(lock_file); + lock_file = NULL; + } +}