mingw: avoid illegal filename in t9118

diff --git a/ident.c b/ident.c
index bb1b1743526446bac21abe7da28b15837c8185dc..daf7e1ea8370e5b6a60c5a33a1591ef939655664 100644 (file)
--- a/ident.c
+++ b/ident.c
@@ -91,10 +91,35 @@ static int add_mailname_host(struct strbuf *buf)
        return 0;
 }
 
+static int canonical_name(const char *host, struct strbuf *out)
+{
+       int status = -1;
+
+#ifndef NO_IPV6
+       struct addrinfo hints, *ai;
+       memset (&hints, '\0', sizeof (hints));
+       hints.ai_flags = AI_CANONNAME;
+       if (!getaddrinfo(host, NULL, &hints, &ai)) {
+               if (ai && strchr(ai->ai_canonname, '.')) {
+                       strbuf_addstr(out, ai->ai_canonname);
+                       status = 0;
+               }
+               freeaddrinfo(ai);
+       }
+#else
+       struct hostent *he = gethostbyname(host);
+       if (he && strchr(he->h_name, '.')) {
+               strbuf_addstr(out, he->h_name);
+               status = 0;
+       }
+#endif /* NO_IPV6 */
+
+       return status;
+}
+
 static void add_domainname(struct strbuf *out, int *is_bogus)
 {
        char buf[1024];
-       struct hostent *he;
 
        if (gethostname(buf, sizeof(buf))) {
                warning("cannot get host name: %s", strerror(errno));
@@ -104,9 +129,7 @@ static void add_domainname(struct strbuf *out, int *is_bogus)
        }
        if (strchr(buf, '.'))
                strbuf_addstr(out, buf);
-       else if ((he = gethostbyname(buf)) && strchr(he->h_name, '.'))
-               strbuf_addstr(out, he->h_name);
-       else {
+       else if (canonical_name(buf, out) < 0) {
                strbuf_addf(out, "%s.(none)", buf);
                *is_bogus = 1;
        }