Put in a have_route_to cobbled up from stuff sent by Sowmini.

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

diff --git a/pppd/sys-osf.c b/pppd/sys-osf.c
index 93070e558ccb2c02c843781af1a6ca6b6d61b98b..91470ae144bf939b35a064083d1ddb263c266325 100644 (file)
--- a/pppd/sys-osf.c
+++ b/pppd/sys-osf.c
@@ -26,9 +26,10 @@
  */
 
 #ifndef lint
-static char rcsid[] = "$Id: sys-osf.c,v 1.14 1998/11/07 06:59:31 paulus Exp $";
+static char rcsid[] = "$Id: sys-osf.c,v 1.16 1999/03/08 04:49:12 paulus Exp $";
 #endif
 
+#define _SOCKADDR_LEN
 #include <stdio.h>
 #include <stddef.h>
 #include <stdlib.h>
@@ -50,12 +51,15 @@ static char rcsid[] = "$Id: sys-osf.c,v 1.14 1998/11/07 06:59:31 paulus Exp $";
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/poll.h>
+#include <sys/ioctl.h>
 #include <net/if.h>
+#include <net/if_dl.h>
 #include <net/if_arp.h>
 #include <net/route.h>
 #include <net/ppp_defs.h>
 #include <net/pppio.h>
 #include <netinet/in.h>
+#include <arpa/inet.h>
 
 #include "pppd.h"
 
@@ -1213,6 +1217,7 @@ cifaddr(u, o, h)
     struct ifreq ifr;
 
     ifaddrs[0] = 0;
+    ifaddrs[1] = 0;
     bzero(&ifr, sizeof (ifr));
     strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
     SET_SA_FAMILY(ifr.ifr_addr, AF_INET);
@@ -1499,6 +1504,70 @@ GetMask(addr)
     return mask;
 }
 
+/*
+ * have_route_to - determine if the system has any route to
+ * a given IP address.  `addr' is in network byte order.
+ * For demand mode to work properly, we have to ignore routes
+ * through our own interface.
+ */
+int have_route_to(u_int32_t addr)
+{
+       char buf[sizeof(struct rt_msghdr) + (sizeof(struct sockaddr_in))];
+       int status;
+       int s, n;
+       struct rt_msghdr *rtm;
+       struct sockaddr_in *sin;
+       int msglen = sizeof(*rtm) + (sizeof(*sin)) ;
+       char msg[2048];
+
+       rtm = (struct rt_msghdr *)buf;
+       memset(rtm, 0, msglen);
+       rtm->rtm_msglen = msglen;
+       rtm->rtm_version = RTM_VERSION;
+       rtm->rtm_type = RTM_GET;
+       rtm->rtm_addrs = RTA_DST;
+       /* rtm->rtm_addrs, rtm_flags  should be set on output */
+
+       sin = (struct sockaddr_in *)((u_char *)rtm + sizeof(*rtm));
+       sin->sin_len = sizeof(*sin);
+       sin->sin_family = AF_INET;
+       sin->sin_addr.s_addr = addr;
+
+        status = 0;
+
+       if ((s = socket(PF_ROUTE, SOCK_RAW, 0)) < 0)
+               return -1;
+       if (write(s, (char *)rtm, msglen) != msglen) {
+               close(s);
+               return status == ESRCH? 0: -1;
+       }
+
+       n = read(s, msg, 2048);
+       close(s);
+       if (n <= 0)
+               return -1;
+
+       rtm = (struct rt_msghdr *) msg;
+       if (rtm->rtm_version != RTM_VERSION)
+               return -1;
+
+       /* here we try to work out if the route is through our own interface */
+       cp = (char *)(rtm + 1);
+       if (rtm->rtm_addrs & RTA_DST) {
+               struct sockaddr *sa = (struct sockaddr *) cp;
+               cp = (char *)(((unsigned long)cp + sa->sa_len
+                              + sizeof(long) - 1) & ~(sizeof(long) - 1));
+       }
+       if (rtm->rtm_addrs & RTA_GATEWAY) {
+               sin = (struct sockaddr_in *) cp;
+               if (sin->sin_addr.s_addr == ifaddrs[0]
+                   || sin->sin_addr.s_addr == ifaddrs[1])
+                       return 0;       /* route is through our interface */
+       }
+
+       return 1;
+}
+
 static int
 strioctl(fd, cmd, ptr, ilen, olen)
     int fd, cmd, ilen, olen;