RFC 4242 support.

CHANGELOG

@@ -54,6 +54,11 @@ version 2.62
 	    two addresses in the same network. Thanks to Jim Bos for
 	    his help nailing this.
 
+            Teach DHCPv6 about the RFC 4242 information-refresh-time
+	    option, and add parsing if the minutes, hours and days
+	    format for options. Thanks to Francois-Xavier Le Bail for
+	    the suggestion.
+
 
 version 2.61
 	    Re-write interface discovery code on *BSD to use

dnsmasq.conf.example

@@ -326,6 +326,9 @@
 # dnsmasq and another.
 #dhcp-option=option6:dns-server,[::],[1234::88]
 
+# Ask client to poll for option changes every six hours. (RFC4242)
+#dhcp-option=option6:information-refresh-time,6h
+
 # Set the NTP time server address to be the same machine as
 # is running dnsmasq
 #dhcp-option=42,0.0.0.0

src/dhcp-common.c

@@ -487,15 +487,15 @@ static const struct opttab_t {
   { "x-windows-fs", 48, OT_ADDR_LIST },
   { "x-windows-dm", 49, OT_ADDR_LIST },
   { "requested-address", 50, OT_INTERNAL | OT_ADDR_LIST },
-  { "lease-time", 51, OT_INTERNAL | OT_DEC },
+  { "lease-time", 51, OT_INTERNAL | OT_TIME },
   { "option-overload", 52, OT_INTERNAL },
   { "message-type", 53, OT_INTERNAL | OT_DEC },
   { "server-identifier", 54, OT_INTERNAL | OT_ADDR_LIST },
   { "parameter-request", 55, OT_INTERNAL },
   { "message", 56, OT_INTERNAL },
   { "max-message-size", 57, OT_INTERNAL },
-  { "T1", 58, OT_INTERNAL | OT_DEC},
-  { "T2", 59, OT_INTERNAL | OT_DEC},
+  { "T1", 58, OT_INTERNAL | OT_TIME},
+  { "T2", 59, OT_INTERNAL | OT_TIME},
   { "vendor-class", 60, 0 },
   { "client-id", 61, OT_INTERNAL },
   { "nis+-domain", 64, OT_NAME },
@@ -546,6 +546,7 @@ static const struct opttab_t opttab6[] = {
   { "nis-domain", 29,  OT_RFC1035_NAME },
   { "nis+-domain", 30, OT_RFC1035_NAME },
   { "sntp-server", 31,  OT_ADDR_LIST },
+  { "information-refresh-time", 32, OT_TIME },
   { "FQDN", 39, OT_INTERNAL | OT_RFC1035_NAME },
   { "ntp-server", 56,  OT_ADDR_LIST },
   { "bootfile-url", 59, OT_NAME },
@@ -710,13 +711,16 @@ char *option_string(int prot, unsigned int opt, unsigned char *val, int opt_len,
 		  }
 	      }	      
 #endif
-	    else if ((ot[o].size & OT_DEC) && opt_len != 0)
+	    else if ((ot[o].size & (OT_DEC | OT_TIME)) && opt_len != 0)
 	      {
 		unsigned int dec = 0;
 		
 		for (i = 0; i < opt_len; i++)
 		  dec = (dec << 8) | val[i]; 
 
+		if (ot[o].size & OT_TIME)
+		  prettyprint_time(buf, dec);
+		else
 		  sprintf(buf, "%u", dec);
 	      }
 	    else

src/dnsmasq.h

@@ -475,7 +475,7 @@ struct frec {
 #define OT_NAME         0x1000
 #define OT_CSTRING      0x0800
 #define OT_DEC          0x0400 
-
+#define OT_TIME         0x0200
 
 /* actions in the daemon->helper RPC */
 #define ACTION_DEL           1

src/option.c

@@ -812,7 +812,35 @@ static int parse_dhcp_opt(char *errstr, char *arg, int flags)
       else if (opt_len & (OT_NAME | OT_RFC1035_NAME | OT_CSTRING))
 	is_addr6 = is_addr = is_dec = is_hex = 0;
       
-      if (is_hex && digs > 1)
+      if (found_dig && (opt_len & OT_TIME) && strlen(comma) > 0)
+	{
+	  int val, fac = 1;
+
+	  switch (comma[strlen(comma) - 1])
+	    {
+	    case 'd':
+	    case 'D':
+	      fac *= 24;
+	      /* fall though */
+	    case 'h':
+	    case 'H':
+	      fac *= 60;
+	      /* fall through */
+	    case 'm':
+	    case 'M':
+	      fac *= 60;
+	      /* fall through */
+	    case 's':
+	    case 'S':
+	      comma[strlen(comma) - 1] = 0;
+	    }
+	  
+	  new->len = 4;
+	  new->val = opt_malloc(4);
+	  val = atoi(comma);
+	  *((int *)new->val) = htonl(val * fac);	  
+	}  
+      else if (is_hex && digs > 1)
 	{
 	  new->len = digs;
 	  new->val = opt_malloc(new->len);