Don't use the getaddrinfo sandbox cache from tor-resolve

Fixes bug 13295; bugfix on 0.2.5.3-alpha.

The alternative here is to call crypto_global_init() from tor-resolve,
but let's avoid linking openssl into tor-resolve for as long as we
can.

changes/13295

+  o Minor bugfixes:
+    - Disable sandbox name resolver cache when running tor-resolve:
+      tor-resolve doesn't use the sandbox code, and turning it on was
+      breaking attempts to do tor-resolve on a non-default server on
+      Linux. Fixes bug 13295; bugfix on 0.2.5.3-alpha.

src/common/sandbox.c

@@ -1385,6 +1385,18 @@ HT_GENERATE(getaddrinfo_cache, cached_getaddrinfo_item_t, node,
             cached_getaddrinfo_items_eq,
             0.6, tor_malloc_, tor_realloc_, tor_free_);
 
+/** If true, don't try to cache getaddrinfo results. */
+static int sandbox_getaddrinfo_cache_disabled = 0;
+
+/** Tell the sandbox layer not to try to cache getaddrinfo results. Used as in
+ * tor-resolve, when we have no intention of initializing crypto or of
+ * installing the sandbox.*/
+void
+sandbox_disable_getaddrinfo_cache(void)
+{
+  sandbox_getaddrinfo_cache_disabled = 1;
+}
+
 int
 sandbox_getaddrinfo(const char *name, const char *servname,
                     const struct addrinfo *hints,
@@ -1393,6 +1405,10 @@ sandbox_getaddrinfo(const char *name, const char *servname,
   int err;
   struct cached_getaddrinfo_item_t search, *item;
 
+  if (sandbox_getaddrinfo_cache_disabled) {
+    return getaddrinfo(name, NULL, hints, res);
+  }
+
   if (servname != NULL) {
     log_warn(LD_BUG, "called with non-NULL servname");
     return EAI_NONAME;
@@ -1834,5 +1850,10 @@ sandbox_is_active(void)
 {
   return 0;
 }
+
+void
+sandbox_disable_getaddrinfo_cache(void)
+{
+}
 #endif
 

src/common/sandbox.h

@@ -208,5 +208,7 @@ int sandbox_init(sandbox_cfg_t* cfg);
 /** Return true iff the sandbox is turned on. */
 int sandbox_is_active(void);
 
+void sandbox_disable_getaddrinfo_cache(void);
+
 #endif /* SANDBOX_H_ */
 

src/tools/tor-resolve.c

@@ -8,6 +8,7 @@
 #include "../common/util.h"
 #include "address.h"
 #include "../common/torlog.h"
+#include "sandbox.h"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -344,6 +345,7 @@ main(int argc, char **argv)
   log_severity_list_t *s = tor_malloc_zero(sizeof(log_severity_list_t));
 
   init_logging();
+  sandbox_disable_getaddrinfo_cache();
 
   arg = &argv[1];
   n_args = argc-1;