import of dnsmasq-2.19.tar.gz

CHANGELOG

@@ -1307,8 +1307,22 @@ version 2.18
 	    Enable long command line options on FreeBSD when the
 	    C library supports them.
 
-
-
+version 2.19 
+            Tweaked the Linux-only interface discovery code to cope 
+	    with interface-indexes larger than 8 bits in
+            /proc/net/if_inet6. This only affects Linux, obviously.  
+	    Thanks to Richard Atterer for the bug report.
+
+	    Check for under-length option fields in DHCP packets, a
+	    zero length client-id, in particluar, could seriously
+	    confuse dnsmasq 'till now. Thanks to Will Murname for help
+	    with that.
+
+	    If a DHCP-allocated address has an associated name in
+	    /etc/hosts, and the client does not provide a hostname
+	    parameter and there is no hostname in a matching dhcp-host
+	    option, send the /etc/hosts name as the hostname in 
+	    the DHCP lease. Thanks to Will Murname for the suggestion.
 
  
 		

FAQ

@@ -115,7 +115,7 @@ A: Resolver code sometime does strange things when given names without
    --expand-hosts and --domain-suffix options.
 
 Q: Can I get dnsmasq to save the contents of its cache to disk when
-   I shut my machine down and re-load when it starts again.
+   I shut my machine down and re-load when it starts again?
 
 A: No, that facility is not provided. Very few names in the DNS have
    their time-to-live set for longer than a few hours so most of the
@@ -299,7 +299,22 @@ A: Because when a Gentoo box shuts down, it releases its lease with
    dnsmasq ignores it until is times out and restarts the process.
    To fix this, set the dhcp-authoritative flag in dnsmasq.
 
-
+Q: My laptop has two network interfaces, a wired one and a wireless
+   one. I never use both interfaces at the same time, and I'd like the
+   same IP and configuration to be used irrespcetive of which
+   interface is in use. How can I do that.
+
+A: By default, the identity of a machine is determined by using the
+   MAC address, which is associated with interface hardware. Once an
+   IP is bound to the MAC address of one interface, it cannot be
+   associated with another MAC address until after the DHCP lease
+   expires. The solution to this is to use a client-id as the machine
+   identity rather than the MAC address. If you arrange for the same
+   client-id to sent when either interface is in use, the DHCP server
+   will recognise the same machine, and use the same address. The
+   method for setting the client-id varies with DHCP client software,
+   dhcpcd uses the "-I" flag. Windows uses a registry setting,
+   see http://www.jsiinc.com/SUBF/TIP2800/rh2845.htm
 
 
 	      

dnsmasq-rh.spec

@@ -5,7 +5,7 @@
 ###############################################################################
 
 Name: dnsmasq
-Version: 2.18
+Version: 2.19
 Release: 1
 Copyright: GPL
 Group: System Environment/Daemons

dnsmasq-suse.spec

@@ -5,7 +5,7 @@
 ###############################################################################
 
 Name: dnsmasq
-Version: 2.18
+Version: 2.19
 Release: 1
 Copyright: GPL
 Group: Productivity/Networking/DNS/Servers

src/config.h

@@ -12,7 +12,7 @@
 
 /* Author's email: simon@thekelleys.org.uk */
 
-#define VERSION "2.18"
+#define VERSION "2.19"
 
 #define FTABSIZ 150 /* max number of outstanding requests */
 #define MAX_PROCS 20 /* max no children for TCP requests */

src/dhcp.c

@@ -656,3 +656,41 @@ void dhcp_update_configs(struct dhcp_config *configs)
       }
 }
 
+/* If we've not found a hostname any other way, try and see if there's one in /etc/hosts
+   for this address. If it has a domain part, that must match the set domain and
+   it gets stripped. */
+char *host_from_dns(struct daemon *daemon, struct in_addr addr)
+{
+  struct crec *lookup = cache_find_by_addr(NULL, (struct all_addr *)&addr, 0, F_IPV4);
+  char *hostname = NULL;
+  
+  if (lookup && (lookup->flags & F_HOSTS))
+    {
+      hostname = daemon->dhcp_buff;
+      hostname[256] = 0;
+      strncpy(hostname, cache_get_name(lookup), 256);
+      hostname = strip_hostname(daemon, hostname);
+    }
+
+  return hostname;
+}
+
+char *strip_hostname(struct daemon *daemon, char *hostname)
+{
+  char *dot = strchr(hostname, '.');
+  if (dot)
+    {
+      if (!daemon->domain_suffix || !hostname_isequal(dot+1, daemon->domain_suffix))
+	{
+	  syslog(LOG_WARNING, "Ignoring DHCP host name %s because it has an illegal domain part", hostname);
+	  hostname = NULL;
+	}
+      else
+	{
+	  *dot = 0; /* truncate */
+	  if (strlen(hostname) == 0)
+	    hostname = NULL; /* nothing left */
+	}
+    }
+  return hostname;
+}

src/dnsmasq.h

@@ -478,6 +478,8 @@ struct dhcp_config *find_config(struct dhcp_config *configs,
 void dhcp_update_configs(struct dhcp_config *configs);
 void dhcp_read_ethers(struct daemon *daemon);
 struct dhcp_config *config_find_by_address(struct dhcp_config *configs, struct in_addr addr);
+char *strip_hostname(struct daemon *daemon, char *hostname);
+char *host_from_dns(struct daemon *daemon, struct in_addr addr);
 
 /* lease.c */
 void lease_update_file(int force, time_t now);

src/network.c

@@ -178,7 +178,7 @@ struct irec *enumerate_interfaces(struct daemon *daemon)
       unsigned int plen, scope, flags, if_idx;
       char devname[20], addrstring[32];
       
-      while (fscanf(f, "%32s %02x %02x %02x %02x %20s\n",
+      while (fscanf(f, "%32s %x %x %x %x %20s\n",
 		    addrstring, &if_idx, &plen, &scope, &flags, devname) != EOF) 
 	{
 	  int i;
@@ -199,9 +199,7 @@ struct irec *enumerate_interfaces(struct daemon *daemon)
 	  strncpy(sifr.ifr_name, devname, IF_NAMESIZE);
 	  if (ioctl(fd, SIOCGIFFLAGS, &sifr) < 0)
 	    die("ioctl error getting interface flags: %m", NULL);
-	  
 	  iface = add_iface(daemon, iface, sifr.ifr_name, sifr.ifr_flags & IFF_LOOPBACK, &addr);
-	  
 	}	    
       fclose(f);
     }

src/rfc2131.c

@@ -59,13 +59,13 @@ static unsigned char *option_end(unsigned char *p, unsigned char *end, struct dh
 static unsigned char *option_put_string(unsigned char *p, unsigned char *end, int opt, char *string);
 static void bootp_option_put(struct dhcp_packet *mess, 
 			     struct dhcp_boot *boot_opts, struct dhcp_netid *netids);
-static int option_len(unsigned char *opt);
+static unsigned int option_len(unsigned char *opt);
 static void *option_ptr(unsigned char *opt);
 static struct in_addr option_addr(unsigned char *opt);
 static unsigned int option_uint(unsigned char *opt, int size);
 static void log_packet(char *type, struct in_addr *addr, unsigned char *hwaddr, char *interface, char *string);
 static int match_netid(struct dhcp_netid *check, struct dhcp_netid *pool);
-static unsigned char *option_find(struct dhcp_packet *mess, int size, int opt_type);
+static unsigned char *option_find(struct dhcp_packet *mess, int size, int opt_type, unsigned int minsize);
 static unsigned char *do_req_options(struct dhcp_context *context,
 				     unsigned char *p, unsigned char *end, 
 				     unsigned char *req_options, 
@@ -126,7 +126,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
     return 0;
   
   /* check for DHCP rather than BOOTP */
-  if ((opt = option_find(mess, sz, OPTION_MESSAGE_TYPE)))
+  if ((opt = option_find(mess, sz, OPTION_MESSAGE_TYPE, 1)))
     {
       mess_type = option_uint(opt, 1);
 
@@ -136,18 +136,18 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
 
       /* Some buggy clients set ciaddr when they shouldn't, so clear that here since
 	 it can affect the context-determination code. */
-      if ((option_find(mess, sz, OPTION_REQUESTED_IP) || mess_type == DHCPDISCOVER))
+      if ((option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ) || mess_type == DHCPDISCOVER))
 	mess->ciaddr.s_addr = 0;
 
       /* Check for RFC3011 subnet selector */
-      if ((opt = option_find(mess, sz, OPTION_SUBNET_SELECT)))
+      if ((opt = option_find(mess, sz, OPTION_SUBNET_SELECT, INADDRSZ)))
 	subnet_addr = option_addr(opt);
       
       /* If there is no client identifier option, use the hardware address */
-      if ((opt = option_find(mess, sz, OPTION_CLIENT_ID)))
+      if ((opt = option_find(mess, sz, OPTION_CLIENT_ID, 1)))
 	{
-	  clid = option_ptr(opt);
 	  clid_len = option_len(opt);
+	  clid = option_ptr(opt);
 	}
       else
 	clid =  mess->chaddr;
@@ -253,9 +253,9 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
   
   if (have_config(config, CONFIG_NAME))
     hostname = config->hostname;
-  else if ((opt = option_find(mess, sz, OPTION_HOSTNAME)))
+  else if ((opt = option_find(mess, sz, OPTION_HOSTNAME, 1)))
     {
-      int len = option_len(opt);
+      unsigned int len = option_len(opt);
       hostname = daemon->dhcp_buff;
       memcpy(hostname, option_ptr(opt), len);
       /* May not be zero terminated */
@@ -263,35 +263,16 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
       /* ensure there are no strange chars in there */
       if (!canonicalise(hostname))
 	hostname = NULL;
-      else
-	{
-	  char *dot = strchr(hostname, '.');
-	  if (dot)
-	    {
-	      if (!daemon->domain_suffix || !hostname_isequal(dot+1, daemon->domain_suffix))
-		{
-		  syslog(LOG_WARNING, "Ignoring DHCP host name %s because it has an illegal domain part", hostname);
-		  hostname = NULL;
-		}
-	      else
+      else if ((hostname = strip_hostname(daemon, hostname)) && !config)
 	{
-		  *dot = 0; /* truncate */
-		  if (strlen(hostname) == 0)
-		    hostname = NULL; /* nothing left */
-		}
-	    }
-
 	  /* Search again now we have a hostname. 
 	     Only accept configs without CLID and HWADDR here, (they won't match)
 	     to avoid impersonation by name. */
-	  if (!config)
-	    {
 	  struct dhcp_config *new = find_config(daemon->dhcp_conf, context, NULL, 0, mess->chaddr, hostname);
 	  if (!have_config(new, CONFIG_CLID) && !have_config(new, CONFIG_HWADDR))
 	    config = new;
 	}
     }
-    }
   
   if (have_config(config, CONFIG_NETID))
     {
@@ -307,10 +288,10 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
      assume that the option is a single string and non RFC3004 compliant 
      and just do the substring match. dhclient provides these broken options. */
 
-  if ((opt = option_find(mess, sz, OPTION_USER_CLASS)))
+  if ((opt = option_find(mess, sz, OPTION_USER_CLASS, 1)))
     {
       unsigned char *ucp = option_ptr(opt);
-      int tmp, j;
+      unsigned int tmp, j;
       for (j = 0; j < option_len(opt); j += ucp[j] + 1);
       if (j == option_len(opt))
 	for (j = 0; j < option_len(opt); j = tmp)
@@ -321,9 +302,9 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
     }
   
   for (vendor = daemon->dhcp_vendors; vendor; vendor = vendor->next)
-    if ((opt = option_find(mess, sz, vendor->is_vendor ? OPTION_VENDOR_ID : OPTION_USER_CLASS)))
+    if ((opt = option_find(mess, sz, vendor->is_vendor ? OPTION_VENDOR_ID : OPTION_USER_CLASS, 1)))
       {
-	int i;
+	unsigned int i;
 	for (i = 0; i <= (option_len(opt) - vendor->len); i++)
 	  if (memcmp(vendor->data, option_ptr(opt)+i, vendor->len) == 0)
 	    {
@@ -348,23 +329,22 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
   /* do we have a lease in store? */
   lease = lease_find_by_client(clid, clid_len);
   
-  if ((opt = option_find(mess, sz, OPTION_REQUESTED_OPTIONS)))
+  if ((opt = option_find(mess, sz, OPTION_REQUESTED_OPTIONS, 0)))
     {
-      int len = option_len(opt);
       req_options = daemon->dhcp_buff2;
-      memcpy(req_options, option_ptr(opt), len);
-      req_options[len] = OPTION_END;
+      memcpy(req_options, option_ptr(opt), option_len(opt));
+      req_options[option_len(opt)] = OPTION_END;
     }
   
   switch (mess_type)
     {
     case DHCPDECLINE:
-      if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER)) ||
+      if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) ||
 	  (iface_addr.s_addr != option_addr(opt).s_addr))
 	return 0;
 
       /* sanitise any message. Paranoid? Moi? */
-      if ((opt = option_find(mess, sz, OPTION_MESSAGE)))
+      if ((opt = option_find(mess, sz, OPTION_MESSAGE, 1)))
 	{ 
 	  char *p = option_ptr(opt), *q = daemon->dhcp_buff;
 	  int i;
@@ -379,7 +359,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
 	  message = daemon->dhcp_buff;
 	}
       
-      if (!(opt = option_find(mess, sz, OPTION_REQUESTED_IP)))
+      if (!(opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ)))
 	return 0;
       
       log_packet("DECLINE", option_ptr(opt), mess->chaddr, iface_name, message);
@@ -401,7 +381,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
       return 0;
 
     case DHCPRELEASE:
-      if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER)) ||
+      if (!(opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)) ||
 	  (iface_addr.s_addr != option_addr(opt).s_addr))
 	return 0;
       
@@ -415,7 +395,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
       return 0;
       
     case DHCPDISCOVER:
-      if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP)))	 
+      if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ)))	 
 	addr = option_addr(opt);
       if (ignore || have_config(config, CONFIG_DISABLE))
 	message = "ignored";
@@ -442,7 +422,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
 	}
        
       time = have_config(config, CONFIG_TIME) ? config->lease_time : context->lease_time;
-      if ((opt = option_find(mess, sz, OPTION_LEASE_TIME)))
+      if ((opt = option_find(mess, sz, OPTION_LEASE_TIME, 4)))
 	{
 	  unsigned int req_time = option_uint(opt, 4);
 	  if (time == 0xffffffff || (req_time != 0xffffffff && req_time < time))
@@ -472,12 +452,12 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
     case DHCPREQUEST:
       if (ignore || have_config(config, CONFIG_DISABLE))
 	return 0;
-      if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP)))
+      if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP, INADDRSZ)))
 	{
 	  /* SELECTING  or INIT_REBOOT */
 	  mess->yiaddr = option_addr(opt);
 	  
-	  if ((opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER)))
+	  if ((opt = option_find(mess, sz, OPTION_SERVER_IDENTIFIER, INADDRSZ)))
 	    {
 	      /* SELECTING */
 	      if (iface_addr.s_addr != option_addr(opt).s_addr)
@@ -569,7 +549,7 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
 	    }
 	
 	  time = have_config(config, CONFIG_TIME) ? config->lease_time : context->lease_time;
-	  if ((opt = option_find(mess, sz, OPTION_LEASE_TIME)))
+	  if ((opt = option_find(mess, sz, OPTION_LEASE_TIME, 4)))
 	    {
 	      unsigned int req_time = option_uint(opt, 4);
 	      if (time == 0xffffffff || (req_time != 0xffffffff && req_time < time))
@@ -577,6 +557,8 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
 	    }
 	  
 	  lease_set_hwaddr(lease, mess->chaddr);
+	  if (!hostname)
+	    hostname = host_from_dns(daemon, mess->yiaddr);
 	  if (hostname)
 	    lease_set_hostname(lease, hostname, daemon->domain_suffix);
 	  lease_set_expires(lease, time == 0xffffffff ? 0 : now + (time_t)time);
@@ -620,6 +602,8 @@ int dhcp_reply(struct daemon *daemon, struct in_addr iface_addr, char *iface_nam
       bootp_option_put(mess, daemon->boot_config, netid);
       p = option_put(p, end, OPTION_MESSAGE_TYPE, 1, DHCPACK);
       p = option_put(p, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(iface_addr.s_addr));
+      if (!hostname)
+	hostname = host_from_dns(daemon, mess->yiaddr);
       p = do_req_options(context, p, end, req_options, daemon, 
 			 hostname, iface_addr, netid, subnet_addr);
       p = option_end(p, end, mess);
@@ -644,7 +628,7 @@ static void log_packet(char *type, struct in_addr *addr, unsigned char *hwaddr,
 	 string ? string : "");
 }
 
-static int option_len(unsigned char *opt)
+static unsigned int option_len(unsigned char *opt)
 {
   return opt[1];
 }
@@ -756,13 +740,13 @@ static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt
   
   while (*p != OPTION_END) 
     {
-      if (end && (p >= end))
+      if (p >= end)
 	return 0; /* malformed packet */
       else if (*p == OPTION_PAD)
 	p++;
       else if (*p == OPTION_OVERLOAD)
 	{
-	  if (end && (p >= end - 3))
+	  if (p >= end - 3)
 	    return 0; /* malformed packet */
 	  if (overload) 
 	    *overload = *(p+2);
@@ -771,10 +755,10 @@ static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt
       else 
 	{ 
 	  int opt_len;;
-	  if (end && (p >= end - 2))
+	  if (p >= end - 2)
 	    return 0; /* malformed packet */
 	  opt_len = option_len(p);
-	  if (end && (p >= end - (2 + opt_len)))
+	  if (p >= end - (2 + opt_len))
 	    return 0; /* malformed packet */
 	  if (*p == opt)
 	    return p;
@@ -785,7 +769,7 @@ static unsigned char *option_find1(unsigned char *p, unsigned char *end, int opt
   return NULL;
 }
  
-static unsigned char *option_find(struct dhcp_packet *mess, int size, int opt_type)
+static unsigned char *option_find(struct dhcp_packet *mess, int size, int opt_type, unsigned int minsize)
 {
   int overload = 0; 
   unsigned char *ret;
@@ -799,6 +783,10 @@ static unsigned char *option_find(struct dhcp_packet *mess, int size, int opt_ty
   if (!ret && (overload & 2))
     ret = option_find1(&mess->sname[0], &mess->file[64], opt_type, &overload);
   
+  /* Check the option field is big enough */
+  if (ret && (option_len(ret) < minsize))
+    ret = NULL;
+  
   return ret;
 }