Prepare for 2.3.7.0; ignore link-local addresses in /etc/hosts

Signed-off-by: Laurent Bercot <ska@appnovation.com>

3 files changed, 28 insertions, 20 deletions

diff --git a/src/libs6dns/s6dns_hosts_compile.c b/src/libs6dns/s6dns_hosts_compile.c
index b57ffd3..0d537d7 100644
--- a/src/libs6dns/s6dns_hosts_compile.c
+++ b/src/libs6dns/s6dns_hosts_compile.c
@@ -144,20 +144,20 @@ static void *byipv6_dtok (uint32_t d, void *aux)
 
 static inline uint8_t cclass (char c)
 {
-  static uint8_t const ctable[128] = "09999999913111999999999999999999199299999999945977777777776999999888888888888888888888888889999898888888888888888888888888899999" ;
+  static uint8_t const ctable[128] = "0999999991311199999999999999999919929:999999945977777777776999999888888888888888888888888889999898888888888888888888888888899999" ;
   return c & 0x80 ? 9 : ctable[(uint8_t)c] - '0' ;
 }
 
 static int s6dns_hosts_parse (buffer *b, hostdata *hd)
 {
-  static uint8_t const table[6][10] =
+  static uint8_t const table[6][11] =
   {
-    { 0x0a, 0x00, 0x01, 0x00, 0x0b, 0x0b, 0x12, 0x12, 0x12, 0x0b },
-    { 0x0a, 0x01, 0x01, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 },
-    { 0x2a, 0x23, 0x0b, 0x20, 0x0b, 0x12, 0x12, 0x12, 0x12, 0x0b },
-    { 0x0a, 0x03, 0x01, 0x00, 0x0b, 0x0b, 0x0b, 0x0b, 0x14, 0x0b },
-    { 0x4a, 0xc4, 0x0b, 0x40, 0x14, 0x14, 0x0b, 0x14, 0x14, 0x0b },
-    { 0x0a, 0x05, 0x01, 0x00, 0x0b, 0x0b, 0x0b, 0x0b, 0x14, 0x0b }
+    { 0x0a, 0x00, 0x01, 0x00, 0x0b, 0x0b, 0x12, 0x12, 0x12, 0x0b, 0x0b },
+    { 0x0a, 0x01, 0x01, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 },
+    { 0x2a, 0x23, 0x0b, 0x20, 0x0b, 0x12, 0x12, 0x12, 0x12, 0x0b, 0x21 },
+    { 0x0a, 0x03, 0x01, 0x00, 0x0b, 0x0b, 0x0b, 0x0b, 0x14, 0x0b, 0x0b },
+    { 0x4a, 0xc4, 0x0b, 0x40, 0x14, 0x14, 0x0b, 0x14, 0x14, 0x0b, 0x0b },
+    { 0x0a, 0x05, 0x01, 0x00, 0x0b, 0x0b, 0x0b, 0x0b, 0x14, 0x0b, 0x0b }
   } ;
   node_ip *node = 0 ;
   size_t mark = hd->storage.len ;
@@ -177,6 +177,12 @@ static int s6dns_hosts_parse (buffer *b, hostdata *hd)
     {
       char ip[16] ;
       if (!stralloc_0(&hd->storage)) goto err ;
+      if (state == 0x01)  /* ignore link-local addresses */
+      {
+        if (!ip6_scan(hd->storage.s + mark, ip)) goto errill ;
+        hd->storage.len = mark ;
+        continue ;
+      }
       if (ip6_scan(hd->storage.s + mark, ip))
       {
         uint32_t d ;
@@ -203,7 +209,7 @@ static int s6dns_hosts_parse (buffer *b, hostdata *hd)
         flags &= ~1 ;
         node = GENSETDYN_P(node_ip, &hd->ipv4, d) ;
       }
-      else goto err ;
+      else goto errill ;
       hd->storage.len = mark ;
       flags &= ~2 ;
     }
@@ -268,6 +274,8 @@ static int s6dns_hosts_parse (buffer *b, hostdata *hd)
   if (state > 0x0a) return (errno = EILSEQ, 0) ;
   return 1 ;
 
+ errill:
+  errno = EILSEQ ;
  err:
   hostdata_free(hd) ;
   return 0 ;
diff --git a/src/libs6dns/s6dns_hosts_compile.txt b/src/libs6dns/s6dns_hosts_compile.txt
index aa71b93..cbcac26 100644
--- a/src/libs6dns/s6dns_hosts_compile.txt
+++ b/src/libs6dns/s6dns_hosts_compile.txt
@@ -1,25 +1,25 @@
 
 
-class	|	0	1	2	3	4	5	6	7	8	9
-st\ev	|	\0	space	#	\n	-	.	:	0-9	alpha	other
+class	|	0	1	2	3	4	5	6	7	8	9	a
+st\ev	|	\0	space	#	\n	-	.	:	0-9	alpha	other	%
 
 START	|							p	p	p
-00	|	END	START	COMMENT	START	X	X	IP	IP	IP	X
+00	|	END	START	COMMENT	START	X	X	IP	IP	IP	X	X
 
 COMMENT	|
-01	|	END	COMMENT	COMMENT	START	COMMENT	COMMENT	COMMENT	COMMENT	COMMENT	COMMENT
+01	|	END	COMMENT	COMMENT	START	COMMENT	COMMENT	COMMENT	COMMENT	COMMENT	COMMENT COMMENT
 
-IP	|	s	s		s		p	p	p	p
-02	|	END	IPDONE	X	START	X	IP	IP	IP	IP	X
+IP	|	s	s		s		p	p	p	p		s
+02	|	END	IPDONE	X	START	X	IP	IP	IP	IP	X	COMMENT
 
 IPDONE	|									p
-03	|	END	IPDONE	COMMENT	START	X	X	X	X	NAME	X
+03	|	END	IPDONE	COMMENT	START	X	X	X	X	NAME	X	X
 
 NAME	|	f	fn		f	p	p		p	p
-04	|	END	NAMES	X	START	NAME	NAME	X	NAME	NAME	X
+04	|	END	NAMES	X	START	NAME	NAME	X	NAME	NAME	X	X
 
 NAMES	|									p
-05	|	END	NAMES	COMMENT START	X	X	X	X	NAME	X
+05	|	END	NAMES	COMMENT START	X	X	X	X	NAME	X	X
 
 END = 0a
 X = 0b
diff --git a/src/libs6dns/s6dns_init.c b/src/libs6dns/s6dns_init.c
index 10dcbf5..5c8a25c 100644
--- a/src/libs6dns/s6dns_init.c
+++ b/src/libs6dns/s6dns_init.c
@@ -4,10 +4,10 @@
 #include <s6-dns/hosts.h>
 #include <s6-dns/s6dns.h>
 
-int s6dns_init (void)
+int s6dns_init_options (uint32_t options)
 {
   if (!s6dns_rci_init(&s6dns_rci_here, "/etc/resolv.conf")) return 0 ;
-  if (s6dns_hosts_init(&s6dns_hosts_here, "/etc/hosts", "/etc/hosts.cdb", "/tmp/hosts.cdb") == -1) goto err ;
+  if (options & 1 && s6dns_hosts_init(&s6dns_hosts_here, "/etc/hosts", "/etc/hosts.cdb", "/tmp/hosts.cdb") == -1) goto err ;
   return 1 ;
 
  err: