s -> sockfd, added lock and unlock

[ppp.git] / pppd / sys-aix4.c

diff --git a/pppd/sys-aix4.c b/pppd/sys-aix4.c
index 29e2dd3c04f8360c8ddfa1022ed92349dac2694c..ca3144d35a8bf7d6fe8ed4f5318e9207e09f4e06 100644 (file)
--- a/pppd/sys-aix4.c
+++ b/pppd/sys-aix4.c
@@ -1,6 +1,6 @@
 /*
- * sys-str.c - System-dependent procedures for setting up
- * PPP interfaces on systems which use the STREAMS ppp interface.
+ * sys-aix4.c - System-dependent procedures for setting up
+ * PPP interfaces on AIX systems which use the STREAMS ppp interface.
  *
  * Copyright (c) 1989 Carnegie Mellon University.
  * All rights reserved.
@@ -19,7 +19,7 @@
  */
 
 #ifndef lint
-static char rcsid[] = "$Id: sys-aix4.c,v 1.1 1994/11/29 02:36:45 paulus Exp $";
+static char rcsid[] = "$Id: sys-aix4.c,v 1.2 1995/04/24 05:33:43 paulus Exp $";
 #endif
 
 /*
@@ -27,6 +27,7 @@ static char rcsid[] = "$Id: sys-aix4.c,v 1.1 1994/11/29 02:36:45 paulus Exp $";
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <errno.h>
 #include <syslog.h>
 #include <termios.h>
@@ -66,6 +67,8 @@ static int    closed_stdio;
 static int     restore_term;   /* 1 => we've munged the terminal */
 static struct termios inittermios; /* Initial TTY termios */
 
+int sockfd;                    /* socket for doing interface ioctls */
+
 /*
  * sys_init - System-dependent initialization.
  */
@@ -76,6 +79,12 @@ 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);
+    }
 }
 
 /*
@@ -570,7 +579,7 @@ 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();
     }
@@ -716,12 +725,12 @@ 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;
     }
@@ -759,12 +768,12 @@ 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;
         }
@@ -796,26 +805,26 @@ sifaddr(u, o, h, m)
     if (m != 0) {
         syslog(LOG_INFO, "Setting interface mask to %s\n", ip_ntoa(m));
         ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = m;
-        if (ioctl(s, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
+        if (ioctl(sockfd, SIOCSIFNETMASK, (caddr_t) &ifr) < 0) {
             syslog(LOG_ERR, "ioctl(SIOCSIFNETMASK): %m");
             ret = 0;
         }
     }
 
     ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = o;
-    if (ioctl(s, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
+    if (ioctl(sockfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
         syslog(LOG_ERR, "ioctl(SIOCSIFADDR): %m");
         ret = 0;
     }
 
     SET_SA_FAMILY(ifr.ifr_dstaddr, AF_INET);
     ((struct sockaddr_in *) &ifr.ifr_dstaddr)->sin_addr.s_addr = h;
-    if (ioctl(s, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
+    if (ioctl(sockfd, SIOCSIFDSTADDR, (caddr_t) &ifr) < 0) {
         syslog(LOG_ERR, "ioctl(SIOCSIFDSTADDR): %m");
         ret = 0;
     }
     ((struct sockaddr_in *) &ifr.ifr_addr)->sin_addr.s_addr = o;
-    if (ioctl(s, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
+    if (ioctl(sockfd, SIOCSIFADDR, (caddr_t) &ifr) < 0) {
         syslog(LOG_ERR, "ioctl(SIOCSIFADDR): %m");
         ret = 0;
     }
@@ -838,7 +847,7 @@ cifaddr(u, o, h)
     SET_SA_FAMILY(rt.rt_gateway, AF_INET);
     ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = o;
     rt.rt_flags = RTF_HOST;
-    if (ioctl(s, SIOCDELRT, (caddr_t) &rt) < 0) {
+    if (ioctl(sockfd, SIOCDELRT, (caddr_t) &rt) < 0) {
        syslog(LOG_ERR, "ioctl(SIOCDELRT): %m");
        return 0;
     }
@@ -859,7 +868,7 @@ sifdefaultroute(u, g)
     SET_SA_FAMILY(rt.rt_gateway, AF_INET);
     ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g;
     rt.rt_flags = RTF_GATEWAY;
-    if (ioctl(s, SIOCADDRT, &rt) < 0) {
+    if (ioctl(sockfd, SIOCADDRT, &rt) < 0) {
        syslog(LOG_ERR, "default route ioctl(SIOCADDRT): %m");
        return 0;
     }
@@ -880,7 +889,7 @@ cifdefaultroute(u, g)
     SET_SA_FAMILY(rt.rt_gateway, AF_INET);
     ((struct sockaddr_in *) &rt.rt_gateway)->sin_addr.s_addr = g;
     rt.rt_flags = RTF_GATEWAY;
-    if (ioctl(s, SIOCDELRT, &rt) < 0) {
+    if (ioctl(sockfd, SIOCDELRT, &rt) < 0) {
        syslog(LOG_ERR, "default route ioctl(SIOCDELRT): %m");
        return 0;
     }
@@ -911,7 +920,7 @@ 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;
     }
@@ -932,7 +941,7 @@ cifproxyarp(unit, hisaddr)
     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_ERR, "ioctl(SIOCDARP): %m");
        return 0;
     }
@@ -1117,3 +1126,98 @@ logwtmp(line, name, host)
     }
     close(fd);
 }
+
+/*
+ * Code for locking/unlocking the serial device.
+ * This code is derived from chat.c.
+ */
+
+#ifndef LOCK_DIR
+# ifdef HDB
+#  define      PIDSTRING
+#  define      LOCK_PREFIX     "/usr/spool/locks/LCK.."
+# else /* HDB */
+#  define      LOCK_PREFIX     "/usr/spool/uucp/LCK.."
+# endif /* HDB */
+#endif /* LOCK_DIR */
+
+/*
+ * lock - create a lock file for the named device.
+ */
+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 */
+#ifdef PIDSTRING
+           n = read(fd, hdb_lock_buffer, 11);
+           if (n > 0) {
+               hdb_lock_buffer[n] = 0;
+               pid = atoi(hdb_lock_buffer);
+           }
+#else
+           n = read(fd, &pid, sizeof(pid));
+#endif
+           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;
+    }
+
+#ifdef PIDSTRING
+    sprintf(hdb_lock_buffer, "%10d\n", getpid());
+    write(fd, hdb_lock_buffer, 11);
+#else
+    pid = getpid();
+    write(fd, &pid, sizeof pid);
+#endif
+
+    close(fd);
+    return 0;
+}
+
+/*
+ *     Remove our lockfile
+ */
+unlock()
+{
+    if (lock_file) {
+       unlink(lock_file);
+       free(lock_file);
+       lock_file = NULL;
+    }
+}