X-Git-Url: http://git.ozlabs.org/?p=ppp.git;a=blobdiff_plain;f=pppd%2Fsys-bsd.c;h=eea6125b3352535cab75ede48b0f7b337f0427b6;hp=f07a3b7351b7fa8462f8d2700d3c77ff4018b56d;hb=b5515fc2384f2621ae6808c3119585d7f8406dc8;hpb=31e531a04e1f20c89aef30b0744bed4eb0c1806a diff --git a/pppd/sys-bsd.c b/pppd/sys-bsd.c index f07a3b7..eea6125 100644 --- a/pppd/sys-bsd.c +++ b/pppd/sys-bsd.c @@ -19,21 +19,28 @@ */ #ifndef lint -static char rcsid[] = "$Id: sys-bsd.c,v 1.9 1994/08/22 00:41:00 paulus Exp $"; +static char rcsid[] = "$Id: sys-bsd.c,v 1.21 1995/08/16 01:40:23 paulus Exp $"; #endif /* * TODO: */ +#include #include +#include +#include +#include +#include +#include #include #include #include #include -#include +#include #include +#include #include #include #include @@ -44,12 +51,75 @@ static char rcsid[] = "$Id: sys-bsd.c,v 1.9 1994/08/22 00:41:00 paulus Exp $"; #endif #include "pppd.h" -#include "ppp.h" -static int initdisc = -1; /* Initial TTY discipline */ -extern int kdebugflag; +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. */ @@ -132,6 +202,111 @@ disestablish_ppp() } +/* + * 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. */ @@ -183,11 +358,9 @@ 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); } @@ -202,7 +375,7 @@ read_packet(buf) void ppp_send_config(unit, mtu, asyncmap, pcomp, accomp) int unit, mtu; - u_long asyncmap; + u_int32_t asyncmap; int pcomp, accomp; { u_int x; @@ -210,7 +383,7 @@ 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(); } @@ -253,7 +426,7 @@ ppp_set_xaccm(unit, accm) void ppp_recv_config(unit, mru, asyncmap, pcomp, accomp) int unit, mru; - u_long asyncmap; + u_int32_t asyncmap; int pcomp, accomp; { int x; @@ -285,7 +458,7 @@ ccp_test(unit, opt_ptr, opt_len, for_transmit) int unit, opt_len, for_transmit; u_char *opt_ptr; { - struct ppp_comp_data data; + struct ppp_option_data data; data.ptr = opt_ptr; data.length = opt_len; @@ -312,6 +485,24 @@ ccp_flags_set(unit, isopen, isup) 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 */ @@ -341,31 +532,45 @@ 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; { struct ifreq ifr; u_int x; + 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 (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; + 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; } @@ -380,25 +585,37 @@ sifdown(u) struct ifreq ifr; u_int x; int rv; + struct npioctl npi; rv = 1; - 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"); + 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(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; } @@ -421,7 +638,7 @@ sifdown(u) int sifaddr(u, o, h, m) int u; - u_long o, h, m; + u_int32_t o, h, m; { struct ifaliasreq ifra; @@ -435,7 +652,7 @@ 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"); return 0; @@ -452,7 +669,7 @@ sifaddr(u, o, h, m) int cifaddr(u, o, h) int u; - u_long o, h; + u_int32_t o, h; { struct ifaliasreq ifra; @@ -462,7 +679,7 @@ 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) { + if (ioctl(sockfd, SIOCDIFADDR, (caddr_t) &ifra) < 0) { syslog(LOG_WARNING, "ioctl(SIOCDIFADDR): %m"); return 0; } @@ -475,7 +692,7 @@ cifaddr(u, o, h) int sifdefaultroute(u, g) int u; - u_long g; + u_int32_t g; { return dodefaultroute(g, 's'); } @@ -486,7 +703,7 @@ sifdefaultroute(u, g) int cifdefaultroute(u, g) int u; - u_long g; + u_int32_t g; { return dodefaultroute(g, 'c'); } @@ -496,7 +713,7 @@ cifdefaultroute(u, g) */ int dodefaultroute(g, cmd) - u_long g; + u_int32_t g; int cmd; { int routes; @@ -554,7 +771,7 @@ static int arpmsg_valid; int sifproxyarp(unit, hisaddr) int unit; - u_long hisaddr; + u_int32_t hisaddr; { int routes; int l; @@ -604,7 +821,7 @@ sifproxyarp(unit, hisaddr) int cifproxyarp(unit, hisaddr) int unit; - u_long hisaddr; + u_int32_t hisaddr; { int routes; @@ -638,7 +855,7 @@ cifproxyarp(unit, hisaddr) int sifproxyarp(unit, hisaddr) int unit; - u_long hisaddr; + u_int32_t hisaddr; { struct arpreq arpreq; struct { @@ -663,7 +880,7 @@ 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) { + if (ioctl(sockfd, SIOCSARP, (caddr_t)&arpreq) < 0) { syslog(LOG_ERR, "ioctl(SIOCSARP): %m"); return 0; } @@ -677,14 +894,14 @@ sifproxyarp(unit, hisaddr) int cifproxyarp(unit, hisaddr) int unit; - u_long 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) { + if (ioctl(sockfd, SIOCDARP, (caddr_t)&arpreq) < 0) { syslog(LOG_WARNING, "ioctl(SIOCDARP): %m"); return 0; } @@ -701,11 +918,11 @@ cifproxyarp(unit, hisaddr) int get_ether_addr(ipaddr, hwaddr) - u_long ipaddr; + u_int32_t ipaddr; struct sockaddr_dl *hwaddr; { struct ifreq *ifr, *ifend, *ifp; - u_long ina, mask; + u_int32_t ina, mask; struct sockaddr_dl *dla; struct ifreq ifreq; struct ifconf ifc; @@ -713,7 +930,7 @@ 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; } @@ -723,7 +940,8 @@ 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)); @@ -731,7 +949,7 @@ 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)) @@ -740,15 +958,14 @@ 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) @@ -776,23 +993,143 @@ 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; +} /* - * ppp_available - check whether the system has any ppp interfaces - * (in fact we check whether we can do an ioctl on ppp0). + * lock - create a lock file for the named lock device */ +#define LOCK_PREFIX "/var/spool/lock/LCK.." + int -ppp_available() +lock(dev) + char *dev; { - int s, ok; - struct ifreq ifr; + 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; + } - if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) - return 1; /* can't tell - maybe we're not root */ + sprintf(hdb_lock_buffer, "%10d\n", getpid()); + write(fd, hdb_lock_buffer, 11); - strncpy(ifr.ifr_name, "ppp0", sizeof (ifr.ifr_name)); - ok = ioctl(s, SIOCGIFFLAGS, (caddr_t) &ifr) >= 0; - close(s); + close(fd); + return 0; +} - return ok; +/* + * unlock - remove our lockfile + */ +unlock() +{ + if (lock_file) { + unlink(lock_file); + free(lock_file); + lock_file = NULL; + } }