Revise geoip tests to not require paths of actual geoip config

When I wrote the first one of these, it needed the path of the geoip
file.  But that doesn't translate well in at least two cases:

   - Mingw, where the compile-time path is /c/foo/bar and the
     run-time path is c:\foo\bar.

   - Various CI weirdnesses, where we cross-compile a test binary,
     then copy it into limbo and expect it to work.

Together, these problems precluded these tests running on windows.

So, instead let's just generate some minimal files ourselves, and
test against them.

Fixes bug 25787

changes/bug25787

@@ -0,0 +1,7 @@
+  o Minor bugfixes (testing):
+    - Instead of trying to  read the geoip configuration files from within the
+      unit tests, instead create our own ersatz files with just enough
+      geoip data in the format we expect. Trying to read from the source
+      directory created problems on Windows with mingw, where the
+      build system's paths are not the same as the platform's paths.
+      Fixes bug 25787; bugfix on 0.3.4.1-alpha.

src/test/include.am

@@ -345,7 +345,6 @@ src_test_test_bt_cl_CPPFLAGS= $(src_test_AM_CPPFLAGS) $(TEST_CPPFLAGS)
 
 EXTRA_DIST += \
 	src/test/bt_test.py \
-	src/test/geoip_dummy \
 	src/test/ntor_ref.py \
 	src/test/hs_ntor_ref.py \
 	src/test/hs_build_address.py \

src/test/test_geoip.c

@@ -383,6 +383,17 @@ test_geoip_with_pt(void *arg)
 #undef SET_TEST_IPV6
 #undef CHECK_COUNTRY
 
+static const char GEOIP_CONTENT[] =
+  "134445936,134445939,MP\n"
+  "134445940,134447103,GU\n"
+  "134447104,134738943,US\n"
+  "134738944,134739199,CA\n"
+  "134739200,135192575,US\n"
+  "135192576,135200767,MX\n"
+  "135200768,135430143,US\n"
+  "135430144,135430399,CA\n"
+  "135430400,135432191,US\n";
+
 static void
 test_geoip_load_file(void *arg)
 {
@@ -403,16 +414,18 @@ test_geoip_load_file(void *arg)
   tt_str_op("0000000000000000000000000000000000000000", OP_EQ,
             geoip_db_digest(AF_INET));
 
-  const char FNAME[] = SRCDIR "/src/config/geoip";
-  int rv = geoip_load_file(AF_INET, FNAME);
+  const char *fname = get_fname("geoip");
+  tt_int_op(0, OP_EQ, write_str_to_file(fname, GEOIP_CONTENT, 0));
+
+  int rv = geoip_load_file(AF_INET, fname);
   if (rv != 0) {
-    TT_GRIPE(("Unable to load geoip from %s", escaped(FNAME)));
+    TT_GRIPE(("Unable to load geoip from %s", escaped(fname)));
   }
   tt_int_op(0, OP_EQ, rv);
 
   /* Check that we loaded some countries; this will fail if there are ever
-   * fewer than 50 countries in the world. */
-  tt_int_op(geoip_get_n_countries(), OP_GE, 50);
+   * fewer than 5 countries in our test above. */
+  tt_int_op(geoip_get_n_countries(), OP_GE, 5);
 
   /* Let's see where 8.8.8.8 is. */
   int country = geoip_get_country_by_ipv4(0x08080808);
@@ -425,7 +438,7 @@ test_geoip_load_file(void *arg)
             geoip_db_digest(AF_INET));
 
   /* And it should be set correctly */
-  contents = read_file_to_str(FNAME, RFTS_BIN, NULL);
+  contents = read_file_to_str(fname, RFTS_BIN, NULL);
   uint8_t d[DIGEST_LEN];
   crypto_digest((char*)d, contents, strlen(contents));
   dhex = tor_strdup(hex_str((char*)d, DIGEST_LEN));
@@ -461,12 +474,30 @@ test_geoip6_load_file(void *arg)
   tt_int_op(-1, OP_EQ, geoip_get_country_by_ipv6(&iaddr6));
 
   /* Load geiop6 file */
-  const char FNAME6[] = SRCDIR "/src/config/geoip6";
-  tt_int_op(0, OP_EQ, geoip_load_file(AF_INET6, FNAME6));
+  const char *fname6 = get_fname("geoip6");
+  const char CONTENT[] =
+    "2001:4830:6010::,2001:4830:601f:ffff:ffff:ffff:ffff:ffff,GB\n"
+    "2001:4830:6020::,2001:4830:ffff:ffff:ffff:ffff:ffff:ffff,US\n"
+    "2001:4838::,2001:4838:ffff:ffff:ffff:ffff:ffff:ffff,US\n"
+    "2001:4840::,2001:4840:ffff:ffff:ffff:ffff:ffff:ffff,XY\n"
+    "2001:4848::,2001:4848:ffff:ffff:ffff:ffff:ffff:ffff,ZD\n"
+    "2001:4850::,2001:4850:ffff:ffff:ffff:ffff:ffff:ffff,RO\n"
+    "2001:4858::,2001:4858:ffff:ffff:ffff:ffff:ffff:ffff,TC\n"
+    "2001:4860::,2001:4860:ffff:ffff:ffff:ffff:ffff:ffff,US\n"
+    "2001:4868::,2001:4868:ffff:ffff:ffff:ffff:ffff:ffff,US\n"
+    "2001:4870::,2001:4871:ffff:ffff:ffff:ffff:ffff:ffff,NB\n"
+    "2001:4878::,2001:4878:128:ffff:ffff:ffff:ffff:ffff,US\n"
+    "2001:4878:129::,2001:4878:129:ffff:ffff:ffff:ffff:ffff,CR\n"
+    "2001:4878:12a::,2001:4878:203:ffff:ffff:ffff:ffff:ffff,US\n"
+    "2001:4878:204::,2001:4878:204:ffff:ffff:ffff:ffff:ffff,DE\n"
+    "2001:4878:205::,2001:4878:214:ffff:ffff:ffff:ffff:ffff,US\n";
+  tt_int_op(0, OP_EQ, write_str_to_file(fname6, CONTENT, 0));
+
+  tt_int_op(0, OP_EQ, geoip_load_file(AF_INET6, fname6));
 
   /* Check that we loaded some countries; this will fail if there are ever
-   * fewer than 50 countries in the world. */
-  tt_int_op(geoip_get_n_countries(), OP_GE, 50);
+   * fewer than 5 countries in our test data above. */
+  tt_int_op(geoip_get_n_countries(), OP_GE, 5);
 
   /* Let's see where 2001:4860:4860::8888 (google dns) is. */
   const char *caddr6 = "2001:4860:4860::8888";
@@ -482,7 +513,7 @@ test_geoip6_load_file(void *arg)
             geoip_db_digest(AF_INET6));
 
   /* And it should be set correctly */
-  contents = read_file_to_str(FNAME6, RFTS_BIN, NULL);
+  contents = read_file_to_str(fname6, RFTS_BIN, NULL);
   uint8_t d[DIGEST_LEN];
   crypto_digest((char*)d, contents, strlen(contents));
   dhex = tor_strdup(hex_str((char*)d, DIGEST_LEN));
@@ -507,21 +538,27 @@ test_geoip_load_2nd_file(void *arg)
 {
   (void)arg;
 
+  char *fname_geoip = tor_strdup(get_fname("geoip_data"));
+  char *fname_empty = tor_strdup(get_fname("geoip_empty"));
+
+  tt_int_op(0, OP_EQ, write_str_to_file(fname_geoip, GEOIP_CONTENT, 0));
+  tt_int_op(0, OP_EQ, write_str_to_file(fname_empty, "\n", 0));
+
   /* Load 1st geoip file */
-  const char FNAME[] = SRCDIR "/src/config/geoip";
-  tt_int_op(0, OP_EQ, geoip_load_file(AF_INET, FNAME));
+  tt_int_op(0, OP_EQ, geoip_load_file(AF_INET, fname_geoip));
 
   /* Load 2nd geoip (empty) file */
   /* It has to be the same IP address family */
-  const char FNAME2[] = SRCDIR "/src/test/geoip_dummy";
-  tt_int_op(0, OP_EQ, geoip_load_file(AF_INET, FNAME2));
+  tt_int_op(0, OP_EQ, geoip_load_file(AF_INET, fname_empty));
 
   /* Check that there is no geoip information for 8.8.8.8, */
   /* since loading the empty 2nd file should have delete it. */
   int country = geoip_get_country_by_ipv4(0x08080808);
   tt_int_op(country, OP_EQ, 0);
 
-  done: ;
+ done:
+  tor_free(fname_geoip);
+  tor_free(fname_empty);
 }
 
 #define ENT(name)                                                       \
@@ -529,20 +566,12 @@ test_geoip_load_2nd_file(void *arg)
 #define FORK(name)                                                      \
   { #name, test_ ## name , TT_FORK, NULL, NULL }
 
-#ifdef _WIN32
-#define SKIP_ON_WINDOWS TT_SKIP
-#else
-#define SKIP_ON_WINDOWS 0
-#endif
-
 struct testcase_t geoip_tests[] = {
   { "geoip", test_geoip, TT_FORK, NULL, NULL },
   { "geoip_with_pt", test_geoip_with_pt, TT_FORK, NULL, NULL },
-  { "load_file", test_geoip_load_file, TT_FORK|SKIP_ON_WINDOWS, NULL, NULL },
-  { "load_file6", test_geoip6_load_file, TT_FORK | SKIP_ON_WINDOWS,
-    NULL, NULL },
-  { "load_2nd_file", test_geoip_load_2nd_file, TT_FORK | SKIP_ON_WINDOWS,
-    NULL, NULL },
+  { "load_file", test_geoip_load_file, TT_FORK, NULL, NULL },
+  { "load_file6", test_geoip6_load_file, TT_FORK, NULL, NULL },
+  { "load_2nd_file", test_geoip_load_2nd_file, TT_FORK, NULL, NULL },
 
   END_OF_TESTCASES
 };