Man page update.

man/dnsmasq.8

@@ -213,7 +213,7 @@ addresses appear, it automatically listens on those (subject to any
 access-control configuration). This makes dynamically created
 interfaces work in the same way as the default. Implementing this
 option requires non-standard networking APIs and it is only availble
-under Linux. 
+under Linux. On other platforms it falls-back to --bind-interfaces mode.
 .TP
 .B \-y, --localise-queries
 Return answers to DNS queries from /etc/hosts which depend on the interface over which the query was

src/dnsmasq.c

@@ -114,11 +114,16 @@ int main (int argc, char **argv)
       set_option_bool(OPT_NOWILD);
     }
 #  endif
-
+  
+  /* -- bind-dynamic not supported on !Linux, fall back to --bind-interfaces */
   if (option_bool(OPT_CLEVERBIND))
-    die(_("--bind-dynamic not available on this platform"), NULL, EC_BADCONF);
+    {
+      bind_fallback = 1;
+      set_option_bool(OPT_NOWILD);
+      reset_option_bool(OPT_CLVERBIND);
+    }
 #endif
-
+  
 #ifndef HAVE_TFTP
   if (daemon->tftp_unlimited || daemon->tftp_interfaces)
     die(_("TFTP server not available: set HAVE_TFTP in src/config.h"), NULL, EC_BADCONF);

src/dnsmasq.h

@@ -932,6 +932,7 @@ char *option_string(int prot, unsigned int opt, unsigned char *val,
 		    int opt_len, char *buf, int buf_len);
 void reread_dhcp(void);
 void set_option_bool(unsigned int opt);
+void reset_option_bool(unsigned int opt);
 struct hostsfile *expand_filelist(struct hostsfile *list);
 
 /* forward.c */

src/netlink.c

@@ -188,7 +188,7 @@ int iface_enumerate(int family, void *parm, int (*callback)())
 	if (h->nlmsg_seq != seq || h->nlmsg_pid != netlink_pid || h->nlmsg_type == NLMSG_ERROR)
 	  {
 	    /* May be multicast arriving async */
-	    if (nl_async(h))
+	    if (nl_async(h) && option_bool(OPT_CLEVERBIND))
 	      newaddr = 1; 
 	  }
 	else if (h->nlmsg_type == NLMSG_DONE)
@@ -319,7 +319,7 @@ void netlink_multicast(void)
   
   if ((len = netlink_recv()) != -1)
     for (h = (struct nlmsghdr *)iov.iov_base; NLMSG_OK(h, (size_t)len); h = NLMSG_NEXT(h, len))
-      if (nl_async(h))
+      if (nl_async(h) && option_bool(OPT_CLEVERBIND))
 	newaddr = 1;
   
   /* restore non-blocking status */
@@ -357,7 +357,7 @@ static int nl_async(struct nlmsghdr *h)
 		 iface_enumerate and can't re-enter it now */
 	      send_alarm(0, 0);
 	    }
-	  return !!option_bool(OPT_CLEVERBIND); /* clever bind mode - rescan */
+	  return 1; /* clever bind mode - rescan */
 	}
 #endif	 
 

src/network.c

@@ -347,6 +347,7 @@ static int make_sock(union mysockaddr *addr, int type, int dienow)
   if ((fd = socket(family, type, 0)) == -1)
     {
       int port;
+      char *s;
 
       /* No error if the kernel just doesn't support this IP flavour */
       if (errno == EPROTONOSUPPORT ||
@@ -355,15 +356,15 @@ static int make_sock(union mysockaddr *addr, int type, int dienow)
 	return -1;
       
     err:
+      port = prettyprint_addr(addr, daemon->addrbuff);
+      if (!option_bool(OPT_NOWILD) && !option_bool(OPT_CLEVERBIND))
+	sprintf(daemon->addrbuff, "port %d", port);
+      s = _("failed to create listening socket for %s: %s");
+      
       if (dienow)
-	{
-	  port = prettyprint_addr(addr, daemon->namebuff);
-	  if (!option_bool(OPT_NOWILD))
-	    sprintf(daemon->namebuff, "port %d", port);
-	  die(_("failed to create listening socket for %s: %s"), 
-	      daemon->namebuff, EC_BADNET);
-	
-	}
+	die(s, daemon->addrbuff, EC_BADNET);
+      
+      my_syslog(LOG_ERR, s, daemon->addrbuff, strerror(errno));
       return -1;
     }	
 

src/option.c

@@ -1119,6 +1119,14 @@ void set_option_bool(unsigned int opt)
     daemon->options2 |= 1u << (opt - 32);
 }
 
+void reset_option_bool(unsigned int opt)
+{
+  if (opt < 32)
+    daemon->options &= ~(1u << opt);
+  else
+    daemon->options2 &= ~(1u << (opt - 32));
+}
+
 static char *one_opt(int option, char *arg, char *gen_prob, int command_line)
 {      
   int i;