Look at the proper /etc/hosts file on windows.

This is harder than it might initially seem, since the proper filename
depends on what the admin has decided to call the windows system directory,
which for all we know might be Q:\tralfamidore\slartibartfast.  And of course,
this being windows, there are twelve ways to do it, where you can pick a
nice one or a portable one, but not a really nice portable one.

diff --git a/evdns.c b/evdns.c
index 7d92038d3392b0a279747f7848be7ccf05a70080..ab7c1c75f5da007f9a7cf844504997f671badcc2 100644 (file)
--- a/evdns.c
+++ b/evdns.c
@@ -101,6 +101,8 @@
 #ifdef WIN32
 #include <winsock2.h>
 #include <ws2tcpip.h>
+#define _WIN32_IE 0x400
+#include <shlobj.h>
 #endif
 
 #include <event2/dns.h>
@@ -3391,6 +3393,31 @@ evdns_base_resolv_conf_parse(struct evdns_base *base, int flags, const char *con
        return res;
 }
 
+static char *
+evdns_get_default_hosts_filename(void)
+{
+#ifdef WIN32
+       /* Windows is a little coy about where it puts its configuration
+        * files.  Sure, they're _usually_ in C:\windows\system32, but
+        * there's no reason in principle they couldn't be in
+        * W:\hoboken chicken emergency\
+        */
+       char path[MAX_PATH+1];
+       static const char hostfile[] = "\\drivers\\etc\\hosts";
+       char *path_out;
+       int len_out;
+
+       if (! SHGetSpecialFolderPath(NULL, path, CSIDL_SYSTEM, 0))
+               return NULL;
+       len_out = strlen(path)+strlen(hostfile);
+       path_out = mm_malloc(len_out+1);
+       evutil_snprintf(path_out, len_out, "%s%s", path, hostfile);
+       return path_out;
+#else
+       return mm_strdup("/etc/hosts");
+#endif
+}
+
 static int
 evdns_base_resolv_conf_parse_impl(struct evdns_base *base, int flags, const char *const filename) {
        size_t n;
@@ -3401,11 +3428,10 @@ evdns_base_resolv_conf_parse_impl(struct evdns_base *base, int flags, const char
        log(EVDNS_LOG_DEBUG, "Parsing resolv.conf file %s", filename);
 
        if (flags & DNS_OPTION_HOSTSFILE) {
-#ifdef WIN32
-               evdns_base_load_hosts(base, NULL);
-#else
-               evdns_base_load_hosts(base, "/etc/hosts");
-#endif
+               char *fname = evdns_get_default_hosts_filename();
+               evdns_base_load_hosts(base, fname);
+               if (fname)
+                       mm_free(fname);
        }
 
        if ((err = evutil_read_file(filename, &resolv, &n, 0)) < 0) {
@@ -3648,6 +3674,7 @@ int
 evdns_base_config_windows_nameservers(struct evdns_base *base)
 {
        int r;
+       char *fname;
        if (base == NULL)
                base = current_base;
        if (base == NULL)
@@ -3658,6 +3685,12 @@ evdns_base_config_windows_nameservers(struct evdns_base *base)
                return 0;
        }
        r = load_nameservers_from_registry(base);
+
+       fname = evdns_get_default_hosts_filename();
+       evdns_base_load_hosts(base, fname);
+       if (fname)
+               mm_free(fname);
+
        EVDNS_UNLOCK(base);
        return r;
 }