*/
#ifndef lint
-static char rcsid[] = "$Id: sys-bsd.c,v 1.13 1994/09/21 06:47:37 paulus Exp $";
+static char rcsid[] = "$Id: sys-bsd.c,v 1.22 1995/10/27 03:46:27 paulus Exp $";
#endif
/*
* TODO:
*/
+#include <stdio.h>
#include <syslog.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
#include <termios.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
-#include <sys/errno.h>
+#include <sys/stat.h>
#include <net/if.h>
#include <net/ppp_defs.h>
#include "pppd.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.
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);
}
/*
{
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;
}
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");
+ }
}
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.
*
* For *BSD, we assume that speed_t values numerically equal bits/second.
*/
+void
set_up_tty(fd, local)
int 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;
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 */
}
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().
*/
+void
setdtr(fd, on)
int fd, on;
{
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");
}
}
* for the length of time specified by *timo (indefinite
* if timo is NULL).
*/
+void
wait_input(timo)
struct timeval *timo;
{
int len;
if ((len = read(fd, buf, PPP_MTU + PPP_HDRLEN)) < 0) {
- if (errno == EWOULDBLOCK) {
- MAINDEBUG((LOG_DEBUG, "read(fd): EWOULDBLOCK"));
+ if (errno == EWOULDBLOCK || errno == EINTR)
return -1;
- }
syslog(LOG_ERR, "read(fd): %m");
die(1);
}
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();
}
/*
* 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;
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;
}
/*
/*
* 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 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) {
}
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;
}
((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;
}
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;
/*
* dodefaultroute - talk to a routing socket to add/delete a default route.
*/
-int
+static int
dodefaultroute(g, cmd)
u_int32_t g;
int 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;
}
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;
}
}
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;
}
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;
}
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;
}
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;
}
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 */
*/
#define MAX_IFS 32
-int
+static int
get_ether_addr(ipaddr, hwaddr)
u_int32_t ipaddr;
struct sockaddr_dl *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;
}
* 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));
* 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))
/*
* 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)
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;
+ }
+}