Use {mock,unmock}_hostname_resolver() in relevant tests

These tests all invoke the hostname resolver in one way or another,
and therefore potentially block if our DNS server is missing,
absent, or extremely slow.  Closes ticket 31841.

5 files changed, 22 insertions, 4 deletions

diff --git a/changes/ticket31841 b/changes/ticket31841
new file mode 100644
index 0000000000..6e7fbc1da1
--- /dev/null
+++ b/changes/ticket31841
@@ -0,0 +1,5 @@
+  o Minor features (testing):
+    - When running tests that attempt to look up hostname, replace the libc
+      name lookup functions with ones that do not actually touch the network.
+      This way, the tests complete more quickly in the presence of a slow or
+      missing DNS resolver. Closes ticket 31841.
diff --git a/src/test/test_addr.c b/src/test/test_addr.c
index f99e3be8f5..c89c6e78d4 100644
--- a/src/test/test_addr.c
+++ b/src/test/test_addr.c
@@ -12,6 +12,7 @@
 #include "test/log_test_helpers.h"
 #include "lib/net/resolve.h"
 #include "test/rng_test_helpers.h"
+#include "test/resolve_test_helpers.h"
 
 #ifdef HAVE_SYS_UN_H
 #include <sys/un.h>
@@ -1160,6 +1161,7 @@ test_addr_parse_canonical(void *arg)
 static void
 test_addr_parse(void *arg)
 {
+
   int r;
   tor_addr_t addr;
   uint16_t port;
@@ -1169,6 +1171,8 @@ test_addr_parse(void *arg)
 
   (void)arg;
 
+  mock_hostname_resolver();
+
   /* IPv6-mapped IPv4 addresses. Tor doesn't really use these. */
   TEST_ADDR_V6_PARSE("11:22:33:44:55:66:1.2.3.4", 0,
                      "11:22:33:44:55:66:102:304");
@@ -1273,7 +1277,7 @@ test_addr_parse(void *arg)
                            "11:22::88",99);
 
  done:
-  ;
+  unmock_hostname_resolver();
 }
 
 static void
diff --git a/src/test/test_config.c b/src/test/test_config.c
index 1c6c913078..cbb84e4dcf 100644
--- a/src/test/test_config.c
+++ b/src/test/test_config.c
@@ -45,6 +45,7 @@
 #include "app/config/statefile.h"
 
 #include "test/test_helpers.h"
+#include "test/resolve_test_helpers.h"
 
 #include "feature/dirclient/dir_server_st.h"
 #include "core/or/port_cfg_st.h"
@@ -4068,6 +4069,8 @@ test_config_parse_port_config__ports__ports_given(void *data)
 
   slout = smartlist_new();
 
+  mock_hostname_resolver();
+
   // Test error when encounters an invalid Port specification
   config_port_invalid = mock_config_line("DNSPort", "");
   ret = parse_port_config(NULL, config_port_invalid, "DNS", 0, NULL,
@@ -4764,6 +4767,7 @@ test_config_parse_port_config__ports__ports_given(void *data)
 #endif /* defined(_WIN32) */
 
  done:
+  unmock_hostname_resolver();
   if (slout)
     SMARTLIST_FOREACH(slout,port_cfg_t *,pf,port_cfg_free(pf));
   smartlist_free(slout);
diff --git a/src/test/test_hs_config.c b/src/test/test_hs_config.c
index 2b3afbb6e9..71e1529216 100644
--- a/src/test/test_hs_config.c
+++ b/src/test/test_hs_config.c
@@ -12,6 +12,7 @@
 #include "test/test.h"
 #include "test/test_helpers.h"
 #include "test/log_test_helpers.h"
+#include "test/resolve_test_helpers.h"
 
 #include "app/config/config.h"
 #include "feature/hs/hs_common.h"
@@ -272,6 +273,7 @@ test_valid_service_v2(void *arg)
   int ret;
 
   (void) arg;
+  mock_hostname_resolver();
 
   /* Valid complex configuration. Basic client authorization. */
   {
@@ -314,7 +316,7 @@ test_valid_service_v2(void *arg)
   }
 
  done:
-  ;
+  unmock_hostname_resolver();
 }
 
 static void
@@ -392,6 +394,7 @@ test_valid_service_v3(void *arg)
   int ret;
 
   (void) arg;
+  mock_hostname_resolver();
 
   /* Valid complex configuration. */
   {
@@ -448,7 +451,7 @@ test_valid_service_v3(void *arg)
   }
 
  done:
-  ;
+  unmock_hostname_resolver();
 }
 
 static void
@@ -623,4 +626,3 @@ struct testcase_t hs_config_tests[] = {
 
   END_OF_TESTCASES
 };
-
diff --git a/src/test/test_options.c b/src/test/test_options.c
index 2d45ecd189..d8757491fa 100644
--- a/src/test/test_options.c
+++ b/src/test/test_options.c
@@ -14,6 +14,7 @@
 #include "feature/nodelist/routerset.h"
 #include "core/mainloop/mainloop.h"
 #include "test/log_test_helpers.h"
+#include "test/resolve_test_helpers.h"
 
 #include "lib/sandbox/sandbox.h"
 #include "lib/memarea/memarea.h"
@@ -241,6 +242,7 @@ test_options_validate(void *arg)
   (void)arg;
   setup_log_callback();
   sandbox_disable_getaddrinfo_cache();
+  mock_hostname_resolver();
 
   WANT_ERR("ExtORPort 500000", "Invalid ExtORPort", PH_VALIDATE);
 
@@ -282,6 +284,7 @@ test_options_validate(void *arg)
 
   close_temp_logs();
   clear_log_messages();
+  unmock_hostname_resolver();
   return;
 }