resolv: Add beginnings of a libresolv test suite

38 files changed, 2906 insertions, 0 deletions

diff --git a/support/Makefile b/support/Makefile
index 9544a08573..7e34fcbfcb 100644
--- a/support/Makefile
+++ b/support/Makefile
@@ -26,21 +26,42 @@ extra-libs-noinstall := $(extra-libs)
 
 libsupport-routines = \
   check \
+  check_addrinfo \
+  check_dns_packet \
+  check_hostent \
+  check_netent \
   delayed_exit \
   ignore_stderr \
   oom_error \
+  resolv_test \
   set_fortify_handler \
   support_become_root \
   support_enter_network_namespace \
+  support_format_address_family \
+  support_format_addrinfo \
+  support_format_dns_packet \
+  support_format_herrno \
+  support_format_hostent \
+  support_format_netent \
   support_record_failure \
+  support_run_diff \
   support_test_main \
   support_test_verify_impl \
   temp_file \
   write_message \
+  xaccept \
   xasprintf \
+  xbind \
   xcalloc \
+  xconnect \
+  xfclose \
+  xfopen \
   xfork \
+  xgetsockname \
+  xlisten \
   xmalloc \
+  xmemstream \
+  xpoll \
   xpthread_barrier_destroy \
   xpthread_barrier_init \
   xpthread_barrier_wait \
@@ -52,12 +73,18 @@ libsupport-routines = \
   xpthread_join \
   xpthread_mutex_lock \
   xpthread_mutex_unlock \
+  xpthread_once \
   xpthread_sigmask \
   xpthread_spin_lock \
   xpthread_spin_unlock \
   xrealloc \
+  xrecvfrom \
+  xsendto \
+  xsetsockopt \
   xsocket \
+  xstrdup \
   xwaitpid \
+  xwrite \
 
 libsupport-static-only-routines := $(libsupport-routines)
 # Only build one variant of the library.
diff --git a/support/check_addrinfo.c b/support/check_addrinfo.c
new file mode 100644
index 0000000000..793b34fef3
--- /dev/null
+++ b/support/check_addrinfo.c
@@ -0,0 +1,42 @@
+/* Compare struct addrinfo values against a formatted string.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <support/check_nss.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <support/check.h>
+#include <support/format_nss.h>
+#include <support/run_diff.h>
+
+void
+check_addrinfo (const char *query_description, struct addrinfo *ai, int ret,
+                const char *expected)
+{
+  char *formatted = support_format_addrinfo (ai, ret);
+  if (strcmp (formatted, expected) != 0)
+    {
+      support_record_failure ();
+      printf ("error: addrinfo comparison failure\n");
+      if (query_description != NULL)
+        printf ("query: %s\n", query_description);
+      support_run_diff ("expected", expected,
+                        "actual", formatted);
+    }
+  free (formatted);
+}
diff --git a/support/check_dns_packet.c b/support/check_dns_packet.c
new file mode 100644
index 0000000000..a2c16b118d
--- /dev/null
+++ b/support/check_dns_packet.c
@@ -0,0 +1,42 @@
+/* Check that a DNS packet buffer has the expected contents.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <support/check_nss.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <support/check.h>
+#include <support/format_nss.h>
+#include <support/run_diff.h>
+
+void
+check_dns_packet (const char *query_description,
+                  const unsigned char *buffer, size_t length,
+                  const char *expected)
+{
+  char *formatted = support_format_dns_packet (buffer, length);
+  if (strcmp (formatted, expected) != 0)
+    {
+      support_record_failure ();
+      printf ("error: packet comparison failure\n");
+      if (query_description != NULL)
+        printf ("query: %s\n", query_description);
+      support_run_diff ("expected", expected, "actual", formatted);
+    }
+  free (formatted);
+}
diff --git a/support/check_hostent.c b/support/check_hostent.c
new file mode 100644
index 0000000000..b0661b1173
--- /dev/null
+++ b/support/check_hostent.c
@@ -0,0 +1,42 @@
+/* Compare struct hostent values against a formatted string.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <support/check_nss.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <support/check.h>
+#include <support/format_nss.h>
+#include <support/run_diff.h>
+
+void
+check_hostent (const char *query_description, struct hostent *h,
+               const char *expected)
+{
+  char *formatted = support_format_hostent (h);
+  if (strcmp (formatted, expected) != 0)
+    {
+      support_record_failure ();
+      printf ("error: hostent comparison failure\n");
+      if (query_description != NULL)
+        printf ("query: %s\n", query_description);
+      support_run_diff ("expected", expected,
+                        "actual", formatted);
+    }
+  free (formatted);
+}
diff --git a/support/check_netent.c b/support/check_netent.c
new file mode 100644
index 0000000000..f20862403c
--- /dev/null
+++ b/support/check_netent.c
@@ -0,0 +1,42 @@
+/* Compare struct netent values against a formatted string.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <support/check_nss.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <support/check.h>
+#include <support/format_nss.h>
+#include <support/run_diff.h>
+
+void
+check_netent (const char *query_description, struct netent *e,
+              const char *expected)
+{
+  char *formatted = support_format_netent (e);
+  if (strcmp (formatted, expected) != 0)
+    {
+      support_record_failure ();
+      printf ("error: netent comparison failure\n");
+      if (query_description != NULL)
+        printf ("query: %s\n", query_description);
+      support_run_diff ("expected", expected,
+                        "actual", formatted);
+    }
+  free (formatted);
+}
diff --git a/support/check_nss.h b/support/check_nss.h
new file mode 100644
index 0000000000..6ab2824327
--- /dev/null
+++ b/support/check_nss.h
@@ -0,0 +1,42 @@
+/* Test verification functions for NSS- and DNS-related data.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef SUPPORT_CHECK_NSS_H
+#define SUPPORT_CHECK_NSS_H
+
+#include <netdb.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+/* Compare the data structures against the expected values (which have
+   to be formatted according to the support_format_* functions in
+   <support/format_nss.h>).  If there is a difference, a delayed test
+   failure is recorded, and a diff is written to standard output.  */
+void check_addrinfo (const char *query_description,
+                     struct addrinfo *, int ret, const char *expected);
+void check_dns_packet (const char *query_description,
+                       const unsigned char *, size_t, const char *expected);
+void check_hostent (const char *query_description,
+                    struct hostent *, const char *expected);
+void check_netent (const char *query_description,
+                   struct netent *, const char *expected);
+
+__END_DECLS
+
+#endif  /* SUPPORT_CHECK_NSS_H */
diff --git a/support/format_nss.h b/support/format_nss.h
new file mode 100644
index 0000000000..07e32f5fd1
--- /dev/null
+++ b/support/format_nss.h
@@ -0,0 +1,41 @@
+/* String formatting functions for NSS- and DNS-related data.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef SUPPORT_FORMAT_NSS_H
+#define SUPPORT_FORMAT_NSS_H
+
+#include <netdb.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+/* The following functions format their arguments as human-readable
+   strings (which can span multiple lines).  The caller must free the
+   returned buffer.  For NULL pointers or failure status arguments,
+   error variables such as h_errno and errno are included in the
+   result.  */
+char *support_format_address_family (int);
+char *support_format_addrinfo (struct addrinfo *, int ret);
+char *support_format_dns_packet (const unsigned char *buffer, size_t length);
+char *support_format_herrno (int);
+char *support_format_hostent (struct hostent *);
+char *support_format_netent (struct netent *);
+
+__END_DECLS
+
+#endif  /* SUPPORT_FORMAT_NSS_H */
diff --git a/support/resolv_test.c b/support/resolv_test.c
new file mode 100644
index 0000000000..80d8c74f5a
--- /dev/null
+++ b/support/resolv_test.c
@@ -0,0 +1,1150 @@
+/* DNS test framework and libresolv redirection.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <support/resolv_test.h>
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <nss.h>
+#include <resolv.h>
+#include <search.h>
+#include <stdlib.h>
+#include <string.h>
+#include <support/check.h>
+#include <support/namespace.h>
+#include <support/support.h>
+#include <support/test-driver.h>
+#include <support/xsocket.h>
+#include <support/xthread.h>
+#include <unistd.h>
+
+/* Response builder. */
+
+enum
+  {
+    max_response_length = 65536
+  };
+
+/* List of pointers to be freed.  The hash table implementation
+   (struct hsearch_data) does not provide a way to deallocate all
+   objects, so this approach is used to avoid memory leaks.  */
+struct to_be_freed
+{
+  struct to_be_freed *next;
+  void *ptr;
+};
+
+struct resolv_response_builder
+{
+  const unsigned char *query_buffer;
+  size_t query_length;
+
+  size_t offset;                /* Bytes written so far in buffer.  */
+  ns_sect section;              /* Current section in the DNS packet.  */
+  unsigned int truncate_bytes;  /* Bytes to remove at end of response. */
+  bool drop;