util: introduce in_addr_default_prefix_from_string() and friends

yuwata · yuwata · commit a4798d4e6d88 · 2018-11-05T16:46:26.000+09:00
It is similar to in_addr_prefix_from_string() but it determines
the prefix length from address if it is not specified.
diff --git a/src/basic/in-addr-util.c b/src/basic/in-addr-util.c
@@ -495,8 +495,9 @@ int in_addr_parse_prefixlen(int family, const char *p, unsigned char *ret) {
         return 0;
 }
 
-int in_addr_prefix_from_string(
+int in_addr_prefix_from_string_internal(
                 const char *p,
+                bool use_default_prefixlen,
                 int family,
                 union in_addr_union *ret_prefix,
                 unsigned char *ret_prefixlen) {
@@ -530,6 +531,10 @@ int in_addr_prefix_from_string(
                 r = in_addr_parse_prefixlen(family, e+1, &k);
                 if (r < 0)
                         return r;
+        } else if (family == AF_INET && use_default_prefixlen) {
+                r = in4_addr_default_prefixlen(&buffer.in, &k);
+                if (r < 0)
+                        return r;
         } else
                 k = FAMILY_ADDRESS_SIZE(family) * 8;
 
@@ -541,8 +546,9 @@ int in_addr_prefix_from_string(
         return 0;
 }
 
-int in_addr_prefix_from_string_auto(
+int in_addr_prefix_from_string_auto_internal(
                 const char *p,
+                bool use_default_prefixlen,
                 int *ret_family,
                 union in_addr_union *ret_prefix,
                 unsigned char *ret_prefixlen) {
@@ -573,6 +579,10 @@ int in_addr_prefix_from_string_auto(
                 r = in_addr_parse_prefixlen(family, e+1, &k);
                 if (r < 0)
                         return r;
+        } else if (family == AF_INET && use_default_prefixlen) {
+                r = in4_addr_default_prefixlen(&buffer.in, &k);
+                if (r < 0)
+                        return r;
         } else
                 k = FAMILY_ADDRESS_SIZE(family) * 8;
 
diff --git a/src/basic/in-addr-util.h b/src/basic/in-addr-util.h
@@ -45,8 +45,20 @@ int in4_addr_default_subnet_mask(const struct in_addr *addr, struct in_addr *mas
 int in_addr_mask(int family, union in_addr_union *addr, unsigned char prefixlen);
 int in_addr_prefix_covers(int family, const union in_addr_union *prefix, unsigned char prefixlen, const union in_addr_union *address);
 int in_addr_parse_prefixlen(int family, const char *p, unsigned char *ret);
-int in_addr_prefix_from_string(const char *p, int family, union in_addr_union *ret_prefix, unsigned char *ret_prefixlen);
-int in_addr_prefix_from_string_auto(const char *p, int *ret_family, union in_addr_union *ret_prefix, unsigned char *ret_prefixlen);
+int in_addr_prefix_from_string_internal(const char *p, bool use_default_prefixlen, int family, union in_addr_union *ret_prefix, unsigned char *ret_prefixlen);
+int in_addr_prefix_from_string_auto_internal(const char *p, bool use_default_prefixlen, int *ret_family, union in_addr_union *ret_prefix, unsigned char *ret_prefixlen);
+static inline int in_addr_prefix_from_string(const char *p, int family, union in_addr_union *ret_prefix, unsigned char *ret_prefixlen) {
+        return in_addr_prefix_from_string_internal(p, false, family, ret_prefix, ret_prefixlen);
+}
+static inline int in_addr_prefix_from_string_auto(const char *p, int *ret_family, union in_addr_union *ret_prefix, unsigned char *ret_prefixlen) {
+        return in_addr_prefix_from_string_auto_internal(p, false, ret_family, ret_prefix, ret_prefixlen);
+}
+static inline int in_addr_default_prefix_from_string(const char *p, int family, union in_addr_union *ret_prefix, unsigned char *ret_prefixlen) {
+        return in_addr_prefix_from_string_internal(p, true, family, ret_prefix, ret_prefixlen);
+}
+static inline int in_addr_default_prefix_from_string_auto(const char *p, int *ret_family, union in_addr_union *ret_prefix, unsigned char *ret_prefixlen) {
+        return in_addr_prefix_from_string_auto_internal(p, true, ret_family, ret_prefix, ret_prefixlen);
+}
 
 static inline size_t FAMILY_ADDRESS_SIZE(int family) {
         assert(IN_SET(family, AF_INET, AF_INET6));
