Add support for "unix-abstract:" URIs to support abstract unix domain sockets

Adapted from #21278 by @mheese

doc/naming.md

@@ -34,13 +34,24 @@ Most gRPC implementations support the following URI schemes:
     resolver does not support this, but the c-ares based resolver
     supports specifying this in the form "IP:port".)
 
-- `unix:path` or `unix://absolute_path` -- Unix domain sockets (Unix systems only)
+- `unix:path`, `unix://absolute_path` -- Unix domain sockets (Unix systems only)
   - `path` indicates the location of the desired socket.
   - In the first form, the path may be relative or absolute; in the
     second form, the path must be absolute (i.e., there will actually be
     three slashes, two prior to the path and another to begin the
     absolute path).
 
+- `unix-abstract:abstract_path` -- Unix domain socket in abstract namespace (Unix systems only)
+  - `abstract_path` indicates a name in the abstract namespace.
+  - The name has no connection with filesystem pathnames.
+  - No permissions will apply to the socket - any process/user may access the socket.
+  - The underlying implementation of Abstract sockets uses a null byte ('\0')
+    as the first character; the implementation will prepend this null. Do not include 
+    the null in `abstract_path`.
+  - `abstract_path` cannot contain null bytes.
+    - TODO(https://github.com/grpc/grpc/issues/24638): Unix allows abstract socket names to contain null bytes, 
+      but this is not supported by the gRPC C-core implementation.
+
 The following schemes are supported by the gRPC C-core implementation,
 but may not be supported in other languages:
 

src/core/ext/filters/client_channel/resolver/sockaddr/sockaddr_resolver.cc

@@ -168,6 +168,24 @@ class UnixResolverFactory : public ResolverFactory {
 
   const char* scheme() const override { return "unix"; }
 };
+
+class UnixAbstractResolverFactory : public ResolverFactory {
+ public:
+  bool IsValidUri(const grpc_uri* uri) const override {
+    return ParseUri(uri, grpc_parse_unix_abstract, nullptr);
+  }
+
+  OrphanablePtr<Resolver> CreateResolver(ResolverArgs args) const override {
+    return CreateSockaddrResolver(std::move(args), grpc_parse_unix_abstract);
+  }
+
+  grpc_core::UniquePtr<char> GetDefaultAuthority(
+      grpc_uri* /*uri*/) const override {
+    return grpc_core::UniquePtr<char>(gpr_strdup("localhost"));
+  }
+
+  const char* scheme() const override { return "unix-abstract"; }
+};
 #endif  // GRPC_HAVE_UNIX_SOCKET
 
 }  // namespace
@@ -182,6 +200,8 @@ void grpc_resolver_sockaddr_init() {
 #ifdef GRPC_HAVE_UNIX_SOCKET
   grpc_core::ResolverRegistry::Builder::RegisterResolverFactory(
       absl::make_unique<grpc_core::UnixResolverFactory>());
+  grpc_core::ResolverRegistry::Builder::RegisterResolverFactory(
+      absl::make_unique<grpc_core::UnixAbstractResolverFactory>());
 #endif
 }
 

src/core/ext/transport/chttp2/server/chttp2_server.cc

@@ -25,6 +25,7 @@
 #include <string.h>
 #include <vector>
 
+#include "absl/strings/match.h"
 #include "absl/strings/str_cat.h"
 #include "absl/strings/str_format.h"
 
@@ -46,6 +47,7 @@
 #include "src/core/lib/iomgr/resolve_address.h"
 #include "src/core/lib/iomgr/resource_quota.h"
 #include "src/core/lib/iomgr/tcp_server.h"
+#include "src/core/lib/iomgr/unix_sockets_posix.h"
 #include "src/core/lib/slice/slice_internal.h"
 #include "src/core/lib/surface/api_trace.h"
 #include "src/core/lib/surface/server.h"
@@ -53,6 +55,9 @@
 namespace grpc_core {
 namespace {
 
+const char kUnixUriPrefix[] = "unix:";
+const char kUnixAbstractUriPrefix[] = "unix-abstract:";
+
 class Chttp2ServerListener : public Server::ListenerInterface {
  public:
   static grpc_error* Create(Server* server, const char* addr,
@@ -278,7 +283,16 @@ grpc_error* Chttp2ServerListener::Create(Server* server, const char* addr,
   grpc_error* error = [&]() {
     *port_num = -1;
     /* resolve address */
-    grpc_error* error = grpc_blocking_resolve_address(addr, "https", &resolved);
+    grpc_error* error = GRPC_ERROR_NONE;
+    if (absl::StartsWith(addr, kUnixUriPrefix)) {
+      error = grpc_resolve_unix_domain_address(
+          addr + sizeof(kUnixUriPrefix) - 1, &resolved);
+    } else if (absl::StartsWith(addr, kUnixAbstractUriPrefix)) {
+      error = grpc_resolve_unix_abstract_domain_address(
+          addr + sizeof(kUnixAbstractUriPrefix) - 1, &resolved);
+    } else {
+      error = grpc_blocking_resolve_address(addr, "https", &resolved);
+    }
     if (error != GRPC_ERROR_NONE) return error;
     // Create Chttp2ServerListener.
     listener = new Chttp2ServerListener(server, args);

src/core/lib/iomgr/parse_address.cc

@@ -18,6 +18,8 @@
 
 #include <grpc/support/port_platform.h>
 
+#include "absl/strings/str_cat.h"
+
 #include "src/core/lib/iomgr/grpc_if_nametoindex.h"
 #include "src/core/lib/iomgr/parse_address.h"
 #include "src/core/lib/iomgr/sockaddr.h"
@@ -49,24 +51,98 @@ bool grpc_parse_unix(const grpc_uri* uri,
     gpr_log(GPR_ERROR, "Expected 'unix' scheme, got '%s'", uri->scheme);
     return false;
   }
+  grpc_error* error = grpc_core::UnixSockaddrPopulate(uri->path, resolved_addr);
+  if (error != GRPC_ERROR_NONE) {
+    gpr_log(GPR_ERROR, "%s", grpc_error_string(error));
+    GRPC_ERROR_UNREF(error);
+    return false;
+  }
+  return true;
+}
+
+bool grpc_parse_unix_abstract(const grpc_uri* uri,
+                              grpc_resolved_address* resolved_addr) {
+  if (strcmp("unix-abstract", uri->scheme) != 0) {
+    gpr_log(GPR_ERROR, "Expected 'unix-abstract' scheme, got '%s'",
+            uri->scheme);
+    return false;
+  }
+  grpc_error* error =
+      grpc_core::UnixAbstractSockaddrPopulate(uri->path, resolved_addr);
+  if (error != GRPC_ERROR_NONE) {
+    gpr_log(GPR_ERROR, "%s", grpc_error_string(error));
+    GRPC_ERROR_UNREF(error);
+    return false;
+  }
+  return true;
+}
+
+namespace grpc_core {
+
+grpc_error* UnixSockaddrPopulate(absl::string_view path,
+                                 grpc_resolved_address* resolved_addr) {
   struct sockaddr_un* un =
       reinterpret_cast<struct sockaddr_un*>(resolved_addr->addr);
-  const size_t maxlen = sizeof(un->sun_path);
-  const size_t path_len = strnlen(uri->path, maxlen);
-  if (path_len == maxlen) return false;
+  const size_t maxlen = sizeof(un->sun_path) - 1;
+  if (path.size() > maxlen) {
+    return GRPC_ERROR_CREATE_FROM_COPIED_STRING(
+        absl::StrCat("Path name should not have more than ", maxlen,
+                     " characters")
+            .c_str());
+  }
   un->sun_family = AF_UNIX;
-  strcpy(un->sun_path, uri->path);
+  path.copy(un->sun_path, path.size());
+  un->sun_path[path.size()] = '\0';
   resolved_addr->len = static_cast<socklen_t>(sizeof(*un));
-  return true;
+  return GRPC_ERROR_NONE;
 }
 
-#else /* GRPC_HAVE_UNIX_SOCKET */
+grpc_error* UnixAbstractSockaddrPopulate(absl::string_view path,
+                                         grpc_resolved_address* resolved_addr) {
+  struct sockaddr_un* un =
+      reinterpret_cast<struct sockaddr_un*>(resolved_addr->addr);
+  const size_t maxlen = sizeof(un->sun_path) - 1;
+  if (path.size() > maxlen) {
+    return GRPC_ERROR_CREATE_FROM_COPIED_STRING(
+        absl::StrCat("Path name should not have more than ", maxlen,
+                     " characters")
+            .c_str());
+  }
+  un->sun_family = AF_UNIX;
+  un->sun_path[0] = '\0';
+  path.copy(un->sun_path + 1, path.size());
+  resolved_addr->len =
+      static_cast<socklen_t>(sizeof(un->sun_family) + path.size() + 1);
+  return GRPC_ERROR_NONE;
+}
+
+}  // namespace grpc_core
+
+#else  /* GRPC_HAVE_UNIX_SOCKET */
 
 bool grpc_parse_unix(const grpc_uri* uri,
                      grpc_resolved_address* resolved_addr) {
   abort();
 }
 
+bool grpc_parse_unix_abstract(const grpc_uri* uri,
+                              grpc_resolved_address* resolved_addr) {
+  abort();
+}
+
+namespace grpc_core {
+
+grpc_error* UnixSockaddrPopulate(absl::string_view path,
+                                 grpc_resolved_address* resolved_addr) {
+  abort();
+}
+
+grpc_error* UnixAbstractSockaddrPopulate(absl::string_view path,
+                                         grpc_resolved_address* resolved_addr) {
+  abort();
+}
+
+}  // namespace grpc_core
 #endif /* GRPC_HAVE_UNIX_SOCKET */
 
 bool grpc_parse_ipv4_hostport(const char* hostport, grpc_resolved_address* addr,
@@ -219,6 +295,8 @@ bool grpc_parse_ipv6(const grpc_uri* uri,
 bool grpc_parse_uri(const grpc_uri* uri, grpc_resolved_address* resolved_addr) {
   if (strcmp("unix", uri->scheme) == 0) {
     return grpc_parse_unix(uri, resolved_addr);
+  } else if (strcmp("unix-abstract", uri->scheme) == 0) {
+    return grpc_parse_unix_abstract(uri, resolved_addr);
   } else if (strcmp("ipv4", uri->scheme) == 0) {
     return grpc_parse_ipv4(uri, resolved_addr);
   } else if (strcmp("ipv6", uri->scheme) == 0) {

src/core/lib/iomgr/parse_address.h

@@ -23,6 +23,8 @@
 
 #include <stddef.h>
 
+#include "absl/strings/string_view.h"
+
 #include "src/core/lib/iomgr/resolve_address.h"
 #include "src/core/lib/uri/uri_parser.h"
 
@@ -30,6 +32,11 @@
  * unix socket path. Returns true upon success. */
 bool grpc_parse_unix(const grpc_uri* uri, grpc_resolved_address* resolved_addr);
 
+/** Populate \a resolved_addr from \a uri, whose path is expected to contain a
+ * unix socket path in the abstract namespace. Returns true upon success. */
+bool grpc_parse_unix_abstract(const grpc_uri* uri,
+                              grpc_resolved_address* resolved_addr);
+
 /** Populate \a resolved_addr from \a uri, whose path is expected to contain an
  * IPv4 host:port pair. Returns true upon success. */
 bool grpc_parse_ipv4(const grpc_uri* uri, grpc_resolved_address* resolved_addr);
@@ -50,4 +57,17 @@ bool grpc_parse_ipv6_hostport(const char* hostport, grpc_resolved_address* addr,
 /* Converts named or numeric port to a uint16 suitable for use in a sockaddr. */
 uint16_t grpc_strhtons(const char* port);
 
+namespace grpc_core {
+
+/** Populate \a resolved_addr to be a unix socket at |path| */
+grpc_error* UnixSockaddrPopulate(absl::string_view path,
+                                 grpc_resolved_address* resolved_addr);
+
+/** Populate \a resolved_addr to be a unix socket in the abstract namespace
+ * at |path| */
+grpc_error* UnixAbstractSockaddrPopulate(absl::string_view path,
+                                         grpc_resolved_address* resolved_addr);
+
+}  // namespace grpc_core
+
 #endif /* GRPC_CORE_LIB_IOMGR_PARSE_ADDRESS_H */

src/core/lib/iomgr/resolve_address_posix.cc

@@ -52,11 +52,6 @@ static grpc_error* posix_blocking_resolve_address(
   size_t i;
   grpc_error* err;
 
-  if (name[0] == 'u' && name[1] == 'n' && name[2] == 'i' && name[3] == 'x' &&
-      name[4] == ':' && name[5] != 0) {
-    return grpc_resolve_unix_domain_address(name + 5, addresses);
-  }
-
   std::string host;
   std::string port;
   /* parse name, splitting it into host and port parts */
@@ -67,6 +62,7 @@ static grpc_error* posix_blocking_resolve_address(
         GRPC_ERROR_STR_TARGET_ADDRESS, grpc_slice_from_copied_string(name));
     goto done;
   }
+
   if (port.empty()) {
     if (default_port == nullptr) {
       err = grpc_error_set_str(

src/core/lib/iomgr/unix_sockets_posix.cc

@@ -30,6 +30,7 @@
 
 #include "absl/strings/str_cat.h"
 
+#include "src/core/lib/iomgr/parse_address.h"
 #include "src/core/lib/iomgr/unix_sockets_posix.h"
 
 #include <grpc/support/alloc.h>
@@ -43,25 +44,22 @@ void grpc_create_socketpair_if_unix(int sv[2]) {
 
 grpc_error* grpc_resolve_unix_domain_address(const char* name,
                                              grpc_resolved_addresses** addrs) {
-  struct sockaddr_un* un;
-  if (strlen(name) >
-      GPR_ARRAY_SIZE(((struct sockaddr_un*)nullptr)->sun_path) - 1) {
-    return GRPC_ERROR_CREATE_FROM_COPIED_STRING(
-        absl::StrCat("Path name should not have more than ",
-                     GPR_ARRAY_SIZE(un->sun_path) - 1, " characters")
-            .c_str());
-  }
   *addrs = static_cast<grpc_resolved_addresses*>(
       gpr_malloc(sizeof(grpc_resolved_addresses)));
   (*addrs)->naddrs = 1;
   (*addrs)->addrs = static_cast<grpc_resolved_address*>(
       gpr_malloc(sizeof(grpc_resolved_address)));
-  un = reinterpret_cast<struct sockaddr_un*>((*addrs)->addrs->addr);
-  un->sun_family = AF_UNIX;
-  strncpy(un->sun_path, name, sizeof(un->sun_path));
-  (*addrs)->addrs->len =
-      static_cast<socklen_t>(strlen(un->sun_path) + sizeof(un->sun_family) + 1);
-  return GRPC_ERROR_NONE;
+  return grpc_core::UnixSockaddrPopulate(name, (*addrs)->addrs);
+}
+
+grpc_error* grpc_resolve_unix_abstract_domain_address(
+    const absl::string_view name, grpc_resolved_addresses** addrs) {
+  *addrs = static_cast<grpc_resolved_addresses*>(
+      gpr_malloc(sizeof(grpc_resolved_addresses)));
+  (*addrs)->naddrs = 1;
+  (*addrs)->addrs = static_cast<grpc_resolved_address*>(
+      gpr_malloc(sizeof(grpc_resolved_address)));
+  return grpc_core::UnixAbstractSockaddrPopulate(name, (*addrs)->addrs);
 }
 
 int grpc_is_unix_socket(const grpc_resolved_address* resolved_addr) {
@@ -79,8 +77,13 @@ void grpc_unlink_if_unix_domain_socket(
   }
   struct sockaddr_un* un = reinterpret_cast<struct sockaddr_un*>(
       const_cast<char*>(resolved_addr->addr));
-  struct stat st;
 
+  // There is nothing to unlink for an abstract unix socket
+  if (un->sun_path[0] == '\0' && un->sun_path[1] != '\0') {
+    return;
+  }
+
+  struct stat st;
   if (stat(un->sun_path, &st) == 0 && (st.st_mode & S_IFMT) == S_IFSOCK) {
     unlink(un->sun_path);
   }
@@ -93,6 +96,15 @@ std::string grpc_sockaddr_to_uri_unix_if_possible(
   if (addr->sa_family != AF_UNIX) {
     return "";
   }
+  if (((struct sockaddr_un*)addr)->sun_path[0] == '\0' &&
+      ((struct sockaddr_un*)addr)->sun_path[1] != '\0') {
+    const struct sockaddr_un* un =
+        reinterpret_cast<const struct sockaddr_un*>(resolved_addr->addr);
+    return absl::StrCat(
+        "unix-abstract:",
+        absl::string_view(un->sun_path + 1,
+                          resolved_addr->len - sizeof(un->sun_family) - 1));
+  }
   return absl::StrCat("unix:", ((struct sockaddr_un*)addr)->sun_path);
 }
 

src/core/lib/iomgr/unix_sockets_posix.h

@@ -29,11 +29,16 @@
 
 #include "src/core/lib/iomgr/resolve_address.h"
 
+#include "absl/strings/string_view.h"
+
 void grpc_create_socketpair_if_unix(int sv[2]);
 
 grpc_error* grpc_resolve_unix_domain_address(
     const char* name, grpc_resolved_addresses** addresses);
 
+grpc_error* grpc_resolve_unix_abstract_domain_address(
+    absl::string_view name, grpc_resolved_addresses** addresses);
+
 int grpc_is_unix_socket(const grpc_resolved_address* resolved_addr);
 
 void grpc_unlink_if_unix_domain_socket(

src/core/lib/iomgr/unix_sockets_posix_noop.cc

@@ -40,6 +40,13 @@ grpc_error* grpc_resolve_unix_domain_address(
       "Unix domain sockets are not supported on Windows");
 }
 
+grpc_error* grpc_resolve_unix_abstract_domain_address(
+    absl::string_view, grpc_resolved_addresses** addresses) {
+  *addresses = NULL;
+  return GRPC_ERROR_CREATE_FROM_STATIC_STRING(
+      "Unix domain sockets are not supported on Windows");
+}
+
 int grpc_is_unix_socket(const grpc_resolved_address* addr) { return false; }
 
 void grpc_unlink_if_unix_domain_socket(const grpc_resolved_address* addr) {}

test/core/client_channel/resolvers/sockaddr_resolver_test.cc

@@ -101,6 +101,16 @@ int main(int argc, char** argv) {
   test_fails(ipv6, "ipv6:[::]:123456");
   test_fails(ipv6, "ipv6:www.google.com");
 
+#ifdef GRPC_HAVE_UNIX_SOCKET
+  grpc_core::ResolverFactory* uds =
+      grpc_core::ResolverRegistry::LookupResolverFactory("unix");
+  grpc_core::ResolverFactory* uds_abstract =
+      grpc_core::ResolverRegistry::LookupResolverFactory("unix-abstract");
+
+  test_succeeds(uds, "unix:///tmp/sockaddr_resolver_test");
+  test_succeeds(uds_abstract, "unix-abstract:sockaddr_resolver_test");
+#endif  // GRPC_HAVE_UNIX_SOCKET
+
   grpc_shutdown();
 
   return 0;

test/core/end2end/fixtures/h2_uds.cc

@@ -46,11 +46,10 @@ struct fullstack_fixture_data {
 
 static int unique = 1;
 
-static grpc_end2end_test_fixture chttp2_create_fixture_fullstack(
-    grpc_channel_args* /*client_args*/, grpc_channel_args* /*server_args*/) {
+static grpc_end2end_test_fixture chttp2_create_fixture_fullstack_base(
+    std::string addr) {
   fullstack_fixture_data* ffd = new fullstack_fixture_data;
-  ffd->localaddr = absl::StrFormat("unix:/tmp/grpc_fullstack_test.%d.%d",
-                                   getpid(), unique++);
+  ffd->localaddr = std::move(addr);
 
   grpc_end2end_test_fixture f;
   memset(&f, 0, sizeof(f));
@@ -61,6 +60,21 @@ static grpc_end2end_test_fixture chttp2_create_fixture_fullstack(
   return f;
 }
 
+static grpc_end2end_test_fixture chttp2_create_fixture_fullstack(
+    grpc_channel_args* /*client_args*/, grpc_channel_args* /*server_args*/) {
+  const std::string localaddr = absl::StrFormat(
+      "unix:/tmp/grpc_fullstack_test.%d.%d", getpid(), unique++);
+  return chttp2_create_fixture_fullstack_base(localaddr);
+}
+
+static grpc_end2end_test_fixture
+chttp2_create_fixture_fullstack_abstract_namespace(
+    grpc_channel_args* /*client_args*/, grpc_channel_args* /*server_args*/) {
+  const std::string localaddr = absl::StrFormat(
+      "unix-abstract:grpc_fullstack_test.%d.%d", getpid(), unique++);
+  return chttp2_create_fixture_fullstack_base(localaddr);
+}
+
 void chttp2_init_client_fullstack(grpc_end2end_test_fixture* f,
                                   grpc_channel_args* client_args) {
   fullstack_fixture_data* ffd =
@@ -97,6 +111,13 @@ static grpc_end2end_test_config configs[] = {
          FEATURE_MASK_SUPPORTS_AUTHORITY_HEADER,
      nullptr, chttp2_create_fixture_fullstack, chttp2_init_client_fullstack,
      chttp2_init_server_fullstack, chttp2_tear_down_fullstack},
+    {"chttp2/fullstack_uds_abstract_namespace",
+     FEATURE_MASK_SUPPORTS_DELAYED_CONNECTION |
+         FEATURE_MASK_SUPPORTS_CLIENT_CHANNEL |
+         FEATURE_MASK_SUPPORTS_AUTHORITY_HEADER,
+     nullptr, chttp2_create_fixture_fullstack_abstract_namespace,
+     chttp2_init_client_fullstack, chttp2_init_server_fullstack,
+     chttp2_tear_down_fullstack},
 };
 
 int main(int argc, char** argv) {

test/core/iomgr/parse_address_test.cc

@@ -39,7 +39,7 @@ static void test_grpc_parse_unix(const char* uri_text, const char* pathname) {
   grpc_uri* uri = grpc_uri_parse(uri_text, false);
   grpc_resolved_address addr;
 
-  GPR_ASSERT(1 == grpc_parse_unix(uri, &addr));
+  GPR_ASSERT(1 == grpc_parse_uri(uri, &addr));
   struct sockaddr_un* addr_un =
       reinterpret_cast<struct sockaddr_un*>(addr.addr);
   GPR_ASSERT(AF_UNIX == addr_un->sun_family);
@@ -48,9 +48,27 @@ static void test_grpc_parse_unix(const char* uri_text, const char* pathname) {
   grpc_uri_destroy(uri);
 }
 
+static void test_grpc_parse_unix_abstract(const char* uri_text,
+                                          const char* pathname) {
+  grpc_core::ExecCtx exec_ctx;
+  grpc_uri* uri = grpc_uri_parse(uri_text, false);
+  grpc_resolved_address addr;
+
+  GPR_ASSERT(1 == grpc_parse_uri(uri, &addr));
+  struct sockaddr_un* addr_un =
+      reinterpret_cast<struct sockaddr_un*>(addr.addr);
+  GPR_ASSERT(AF_UNIX == addr_un->sun_family);
+  GPR_ASSERT('\0' == addr_un->sun_path[0]);
+  GPR_ASSERT(0 == strncmp(addr_un->sun_path + 1, pathname, strlen(pathname)));
+
+  grpc_uri_destroy(uri);
+}
+
 #else /* GRPC_HAVE_UNIX_SOCKET */
 
 static void test_grpc_parse_unix(const char* uri_text, const char* pathname) {}
+static void test_grpc_parse_unix_abstract(const char* uri_text,
+                                          const char* pathname) {}
 
 #endif /* GRPC_HAVE_UNIX_SOCKET */
 
@@ -105,6 +123,7 @@ int main(int argc, char** argv) {
   grpc_init();
 
   test_grpc_parse_unix("unix:/path/name", "/path/name");
+  test_grpc_parse_unix_abstract("unix-abstract:foobar", "foobar");
   test_grpc_parse_ipv4("ipv4:192.0.2.1:12345", "192.0.2.1", 12345);
   test_grpc_parse_ipv6("ipv6:[2001:db8::1]:12345", "2001:db8::1", 12345, 0);
   test_grpc_parse_ipv6("ipv6:[2001:db8::1%252]:12345", "2001:db8::1", 12345, 2);

test/core/iomgr/resolve_address_posix_test.cc

@@ -138,40 +138,6 @@ static void must_fail(void* argsp, grpc_error* err) {
   gpr_mu_unlock(args->mu);
 }
 
-static void test_unix_socket(void) {
-  grpc_core::ExecCtx exec_ctx;
-  args_struct args;
-  args_init(&args);
-  poll_pollset_until_request_done(&args);
-  grpc_resolve_address(
-      "unix:/path/name", nullptr, args.pollset_set,
-      GRPC_CLOSURE_CREATE(must_succeed, &args, grpc_schedule_on_exec_ctx),
-      &args.addrs);
-  args_finish(&args);
-}
-
-static void test_unix_socket_path_name_too_long(void) {
-  grpc_core::ExecCtx exec_ctx;
-  args_struct args;
-  args_init(&args);
-  const char prefix[] = "unix:/path/name";
-  size_t path_name_length =
-      GPR_ARRAY_SIZE(((struct sockaddr_un*)nullptr)->sun_path) + 6;
-  char* path_name =
-      static_cast<char*>(gpr_malloc(sizeof(char) * path_name_length));
-  memset(path_name, 'a', path_name_length);
-  memcpy(path_name, prefix, strlen(prefix) - 1);
-  path_name[path_name_length - 1] = '\0';
-
-  poll_pollset_until_request_done(&args);
-  grpc_resolve_address(
-      path_name, nullptr, args.pollset_set,
-      GRPC_CLOSURE_CREATE(must_fail, &args, grpc_schedule_on_exec_ctx),
-      &args.addrs);
-  gpr_free(path_name);
-  args_finish(&args);
-}
-
 static void resolve_address_must_succeed(const char* target) {
   grpc_core::ExecCtx exec_ctx;
   args_struct args;
@@ -250,10 +216,6 @@ int main(int argc, char** argv) {
     // unconditionally use the native DNS resolver).
     grpc_core::UniquePtr<char> resolver =
         GPR_GLOBAL_CONFIG_GET(grpc_dns_resolver);
-    if (gpr_stricmp(resolver.get(), "native") == 0) {
-      test_unix_socket();
-      test_unix_socket_path_name_too_long();
-    }
   }
   gpr_cmdline_destroy(cl);