slirp: Split get_dns_addr

Separate get_dns_addr into get_dns_addr_cached and get_dns_addr_resolv_conf
to make conversion to IPv6 easier.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>

1 files changed, 34 insertions, 19 deletions

diff --git a/slirp.c b/slirp.c
index f7324c8..87b89cb 100644
--- a/slirp.c
+++ b/slirp.c
@@ -108,7 +108,28 @@ static void winsock_cleanup(void)
 
 static struct stat dns_addr_stat;
 
-int get_dns_addr(struct in_addr *pdns_addr)
+static int get_dns_addr_cached(struct in_addr *pdns_addr)
+{
+    struct stat old_stat;
+    if (curtime - dns_addr_time < TIMEOUT_DEFAULT) {
+        *pdns_addr = dns_addr;
+        return 0;
+    }
+    old_stat = dns_addr_stat;
+    if (stat("/etc/resolv.conf", &dns_addr_stat) != 0) {
+        return -1;
+    }
+    if (dns_addr_stat.st_dev == old_stat.st_dev &&
+        dns_addr_stat.st_ino == old_stat.st_ino &&
+        dns_addr_stat.st_size == old_stat.st_size &&
+        dns_addr_stat.st_mtime == old_stat.st_mtime) {
+        *pdns_addr = dns_addr;
+        return 0;
+    }
+    return 1;
+}
+
+static int get_dns_addr_resolv_conf(struct in_addr *pdns_addr)
 {
     char buff[512];
     char buff2[257];
@@ -116,24 +137,6 @@ int get_dns_addr(struct in_addr *pdns_addr)
     int found = 0;
     struct in_addr tmp_addr;
 
-    if (dns_addr.s_addr != 0) {
-        struct stat old_stat;
-        if ((curtime - dns_addr_time) < TIMEOUT_DEFAULT) {
-            *pdns_addr = dns_addr;
-            return 0;
-        }
-        old_stat = dns_addr_stat;
-        if (stat("/etc/resolv.conf", &dns_addr_stat) != 0)
-            return -1;
-        if ((dns_addr_stat.st_dev == old_stat.st_dev) &&
-            (dns_addr_stat.st_ino == old_stat.st_ino) &&
-            (dns_addr_stat.st_size == old_stat.st_size) &&
-            (dns_addr_stat.st_mtime == old_stat.st_mtime)) {
-            *pdns_addr = dns_addr;
-            return 0;
-        }
-    }
-
     f = fopen("/etc/resolv.conf", "r");
     if (!f)
         return -1;
@@ -173,6 +176,18 @@ int get_dns_addr(struct in_addr *pdns_addr)
     return 0;
 }
 
+int get_dns_addr(struct in_addr *pdns_addr)
+{
+    if (dns_addr.s_addr != 0) {
+        int ret;
+        ret = get_dns_addr_cached(pdns_addr);
+        if (ret <= 0) {
+            return ret;
+        }
+    }
+    return get_dns_addr_resolv_conf(pdns_addr);
+}
+
 #endif
 
 static void slirp_init_once(void)