gdb/debuginfod-support.c - binutils-gdb - Git at Google

 /* debuginfod utilities for GDB.
    Copyright (C) 2020-2021 Free Software Foundation, Inc.

    This file is part of GDB.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

 #include "defs.h"
 #include <errno.h>
 #include "gdbsupport/scoped_fd.h"
 #include "debuginfod-support.h"
 #include "gdbsupport/gdb_optional.h"
 #include "cli/cli-cmds.h"
 #include "cli/cli-style.h"

 /* Set/show debuginfod commands.  */
 static cmd_list_element *set_debuginfod_prefix_list;
 static cmd_list_element *show_debuginfod_prefix_list;

 static const char debuginfod_on[] = "on";
 static const char debuginfod_off[] = "off";
 static const char debuginfod_ask[] = "ask";

 static const char *debuginfod_enabled_enum[] =
 {
   debuginfod_on,
   debuginfod_off,
   debuginfod_ask,
   nullptr
 };

 static const char *debuginfod_enabled =
 #if defined(HAVE_LIBDEBUGINFOD)
   debuginfod_ask;
 #else
   debuginfod_off;
 #endif

 static unsigned int debuginfod_verbose = 1;

 #ifndef HAVE_LIBDEBUGINFOD
 scoped_fd
 debuginfod_source_query (const unsigned char *build_id,
 			 int build_id_len,
 			 const char *srcpath,
 			 gdb::unique_xmalloc_ptr<char> *destname)
 {
   return scoped_fd (-ENOSYS);
 }

 scoped_fd
 debuginfod_debuginfo_query (const unsigned char *build_id,
 			    int build_id_len,
 			    const char *filename,
 			    gdb::unique_xmalloc_ptr<char> *destname)
 {
   return scoped_fd (-ENOSYS);
 }

 #define NO_IMPL _("Support for debuginfod is not compiled into GDB.")

 #else
 #include <elfutils/debuginfod.h>

 struct user_data
 {
   user_data (const char *desc, const char *fname)
     : desc (desc), fname (fname)
   { }

   const char * const desc;
   const char * const fname;
   gdb::optional<ui_out::progress_meter> meter;
 };

 /* Deleter for a debuginfod_client.  */

 struct debuginfod_client_deleter
 {
   void operator() (debuginfod_client *c)
   {
     debuginfod_end (c);
   }
 };

 using debuginfod_client_up
   = std::unique_ptr<debuginfod_client, debuginfod_client_deleter>;

 static int
 progressfn (debuginfod_client *c, long cur, long total)
 {
   user_data *data = static_cast<user_data *> (debuginfod_get_user_data (c));
   gdb_assert (data != nullptr);

   if (check_quit_flag ())
     {
       printf_filtered ("Cancelling download of %s %ps...\n",
 		       data->desc,
 		       styled_string (file_name_style.style (), data->fname));
       return 1;
     }

   if (total == 0)
     return 0;

   if (!data->meter.has_value ())
     {
       float size_in_mb = 1.0f * total / (1024 * 1024);
       string_file styled_filename (current_uiout->can_emit_style_escape ());
       fprintf_styled (&styled_filename,
 		      file_name_style.style (),
 		      "%s",
 		      data->fname);
       std::string message
 	= string_printf ("Downloading %.2f MB %s %s", size_in_mb, data->desc,
 			 styled_filename.c_str());
       data->meter.emplace (current_uiout, message, 1);
     }

   current_uiout->progress ((double)cur / (double)total);

   return 0;
 }

 static debuginfod_client *
 get_debuginfod_client ()
 {
   static debuginfod_client_up global_client;

   if (global_client == nullptr)
     {
       global_client.reset (debuginfod_begin ());

       if (global_client != nullptr)
 	debuginfod_set_progressfn (global_client.get (), progressfn);
     }

   return global_client.get ();
 }

 /* Check if debuginfod is enabled.  If configured to do so, ask the user
    whether to enable debuginfod.  */

 static bool
 debuginfod_is_enabled ()
 {
   const char *urls = getenv (DEBUGINFOD_URLS_ENV_VAR);

   if (urls == nullptr || urls[0] == '\0'
       || debuginfod_enabled == debuginfod_off)
     return false;

   if (debuginfod_enabled == debuginfod_ask)
     {
       int resp = nquery (_("\nThis GDB supports auto-downloading debuginfo " \
 			   "from the following URLs:\n%s\nEnable debuginfod " \
 			   "for this session? "),
 			 urls);
       if (!resp)
 	{
 	  printf_filtered (_("Debuginfod has been disabled.\nTo make this " \
 			     "setting permanent, add \'set debuginfod " \
 			     "enabled off\' to .gdbinit.\n"));
 	  debuginfod_enabled = debuginfod_off;
 	  return false;
 	}

       printf_filtered (_("Debuginfod has been enabled.\nTo make this " \
 			 "setting permanent, add \'set debuginfod enabled " \
 			 "on\' to .gdbinit.\n"));
       debuginfod_enabled = debuginfod_on;
     }

   return true;
 }

 /* See debuginfod-support.h  */

 scoped_fd
 debuginfod_source_query (const unsigned char *build_id,
 			 int build_id_len,
 			 const char *srcpath,
 			 gdb::unique_xmalloc_ptr<char> *destname)
 {
   if (!debuginfod_is_enabled ())
     return scoped_fd (-ENOSYS);

   debuginfod_client *c = get_debuginfod_client ();

   if (c == nullptr)
     return scoped_fd (-ENOMEM);

   user_data data ("source file", srcpath);

   debuginfod_set_user_data (c, &data);
   scoped_fd fd (debuginfod_find_source (c,
 					build_id,
 					build_id_len,
 					srcpath,
 					nullptr));
   debuginfod_set_user_data (c, nullptr);

   if (debuginfod_verbose > 0 && fd.get () < 0 && fd.get () != -ENOENT)
     printf_filtered (_("Download failed: %s.  Continuing without source file %ps.\n"),
 		     safe_strerror (-fd.get ()),
 		     styled_string (file_name_style.style (),  srcpath));

   if (fd.get () >= 0)
     *destname = make_unique_xstrdup (srcpath);

   return fd;
 }

 /* See debuginfod-support.h  */

 scoped_fd
 debuginfod_debuginfo_query (const unsigned char *build_id,
 			    int build_id_len,
 			    const char *filename,
 			    gdb::unique_xmalloc_ptr<char> *destname)
 {
   if (!debuginfod_is_enabled ())
     return scoped_fd (-ENOSYS);

   debuginfod_client *c = get_debuginfod_client ();

   if (c == nullptr)
     return scoped_fd (-ENOMEM);

   char *dname = nullptr;
   user_data data ("separate debug info for", filename);

   debuginfod_set_user_data (c, &data);
   scoped_fd fd (debuginfod_find_debuginfo (c, build_id, build_id_len,
 					   &dname));
   debuginfod_set_user_data (c, nullptr);

   if (debuginfod_verbose > 0 && fd.get () < 0 && fd.get () != -ENOENT)
     printf_filtered (_("Download failed: %s.  Continuing without debug info for %ps.\n"),
 		     safe_strerror (-fd.get ()),
 		     styled_string (file_name_style.style (),  filename));

   if (fd.get () >= 0)
     destname->reset (dname);

   return fd;
 }
 #endif

 /* Set callback for "set debuginfod enabled".  */

 static void
 set_debuginfod_enabled (const char *value)
 {
 #if defined(HAVE_LIBDEBUGINFOD)
   debuginfod_enabled = value;
 #else
   error (NO_IMPL);
 #endif
 }

 /* Get callback for "set debuginfod enabled".  */

 static const char *
 get_debuginfod_enabled ()
 {
   return debuginfod_enabled;
 }

 /* Show callback for "set debuginfod enabled".  */

 static void
 show_debuginfod_enabled (ui_file *file, int from_tty, cmd_list_element *cmd,
 			 const char *value)
 {
   printf_unfiltered (_("Debuginfod functionality is currently set to "
 		       "\"%s\".\n"), debuginfod_enabled);
 }

 /* Set callback for "set debuginfod urls".  */

 static void
 set_debuginfod_urls (const std::string &urls)
 {
 #if defined(HAVE_LIBDEBUGINFOD)
   if (setenv (DEBUGINFOD_URLS_ENV_VAR, urls.c_str (), 1) != 0)
     warning (_("Unable to set debuginfod URLs: %s"), safe_strerror (errno));
 #else
   error (NO_IMPL);
 #endif
 }

 /* Get callback for "set debuginfod urls".  */

 static const std::string&
 get_debuginfod_urls ()
 {
   static std::string urls;
 #if defined(HAVE_LIBDEBUGINFOD)
   const char *envvar = getenv (DEBUGINFOD_URLS_ENV_VAR);

   if (envvar != nullptr)
     urls = envvar;
   else
     urls.clear ();
 #endif

   return urls;
 }

 /* Show callback for "set debuginfod urls".  */

 static void
 show_debuginfod_urls (ui_file *file, int from_tty, cmd_list_element *cmd,
 		      const char *value)
 {
   if (value[0] == '\0')
     fprintf_unfiltered (file, _("Debuginfod URLs have not been set.\n"));
   else
     fprintf_filtered (file, _("Debuginfod URLs are currently set to:\n%s\n"),
 		      value);
 }

 /* Show callback for "set debuginfod verbose".  */

 static void
 show_debuginfod_verbose_command (ui_file *file, int from_tty,
 				 cmd_list_element *cmd, const char *value)
 {
   fprintf_filtered (file, _("Debuginfod verbose output is set to %s.\n"),
 		    value);
 }

 /* Register debuginfod commands.  */

 void _initialize_debuginfod ();
 void
 _initialize_debuginfod ()
 {
   /* set/show debuginfod */
   add_setshow_prefix_cmd ("debuginfod", class_run,
 			  _("Set debuginfod options."),
 			  _("Show debuginfod options."),
 			  &set_debuginfod_prefix_list,
 			  &show_debuginfod_prefix_list,
 			  &setlist, &showlist);

   add_setshow_enum_cmd ("enabled", class_run, debuginfod_enabled_enum,
 			_("Set whether to use debuginfod."),
 			_("Show whether to use debuginfod."),
 			_("\
 When on, enable the use of debuginfod to download missing debug info and\n\
 source files."),
 			set_debuginfod_enabled,
 			get_debuginfod_enabled,
 			show_debuginfod_enabled,
 			&set_debuginfod_prefix_list,
 			&show_debuginfod_prefix_list);

   /* set/show debuginfod urls */
   add_setshow_string_noescape_cmd ("urls", class_run, _("\
 Set the list of debuginfod server URLs."), _("\
 Show the list of debuginfod server URLs."), _("\
 Manage the space-separated list of debuginfod server URLs that GDB will query \
 when missing debuginfo, executables or source files.\nThe default value is \
 copied from the DEBUGINFOD_URLS environment variable."),
 				   set_debuginfod_urls,
 				   get_debuginfod_urls,
 				   show_debuginfod_urls,
 				   &set_debuginfod_prefix_list,
 				   &show_debuginfod_prefix_list);

   /* set/show debuginfod verbose */
   add_setshow_zuinteger_cmd ("verbose", class_support,
 			     &debuginfod_verbose, _("\
 Set verbosity of debuginfod output."), _("\
 Show debuginfod debugging."), _("\
 When set to a non-zero value, display verbose output for each debuginfod \
 query.\nTo disable, set to zero.  Verbose output is displayed by default."),
 			     nullptr,
 			     show_debuginfod_verbose_command,
 			     &set_debuginfod_prefix_list,
 			     &show_debuginfod_prefix_list);
 }
	/* debuginfod utilities for GDB.
	Copyright (C) 2020-2021 Free Software Foundation, Inc.

	This file is part of GDB.

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 3 of the License, or
	(at your option) any later version.

	This program 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 General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program. If not, see <http://www.gnu.org/licenses/>. */

	#include "defs.h"
	#include <errno.h>
	#include "gdbsupport/scoped_fd.h"
	#include "debuginfod-support.h"
	#include "gdbsupport/gdb_optional.h"
	#include "cli/cli-cmds.h"
	#include "cli/cli-style.h"

	/* Set/show debuginfod commands. */
	static cmd_list_element *set_debuginfod_prefix_list;
	static cmd_list_element *show_debuginfod_prefix_list;

	static const char debuginfod_on[] = "on";
	static const char debuginfod_off[] = "off";
	static const char debuginfod_ask[] = "ask";

	static const char *debuginfod_enabled_enum[] =
	{
	debuginfod_on,
	debuginfod_off,
	debuginfod_ask,
	nullptr
	};

	static const char *debuginfod_enabled =
	#if defined(HAVE_LIBDEBUGINFOD)
	debuginfod_ask;
	#else
	debuginfod_off;
	#endif

	static unsigned int debuginfod_verbose = 1;

	#ifndef HAVE_LIBDEBUGINFOD
	scoped_fd
	debuginfod_source_query (const unsigned char *build_id,
	int build_id_len,
	const char *srcpath,
	gdb::unique_xmalloc_ptr<char> *destname)
	{
	return scoped_fd (-ENOSYS);
	}

	scoped_fd
	debuginfod_debuginfo_query (const unsigned char *build_id,
	int build_id_len,
	const char *filename,
	gdb::unique_xmalloc_ptr<char> *destname)
	{
	return scoped_fd (-ENOSYS);
	}

	#define NO_IMPL _("Support for debuginfod is not compiled into GDB.")

	#else
	#include <elfutils/debuginfod.h>

	struct user_data
	{
	user_data (const char desc, const char fname)
	: desc (desc), fname (fname)
	{ }

	const char * const desc;
	const char * const fname;
	gdb::optional<ui_out::progress_meter> meter;
	};

	/* Deleter for a debuginfod_client. */

	struct debuginfod_client_deleter
	{
	void operator() (debuginfod_client *c)
	{
	debuginfod_end (c);
	}
	};

	using debuginfod_client_up
	= std::unique_ptr<debuginfod_client, debuginfod_client_deleter>;

	static int
	progressfn (debuginfod_client *c, long cur, long total)
	{
	user_data data = static_cast<user_data > (debuginfod_get_user_data (c));
	gdb_assert (data != nullptr);

	if (check_quit_flag ())
	{
	printf_filtered ("Cancelling download of %s %ps...\n",
	data->desc,
	styled_string (file_name_style.style (), data->fname));
	return 1;
	}

	if (total == 0)
	return 0;

	if (!data->meter.has_value ())
	{
	float size_in_mb = 1.0f * total / (1024 * 1024);
	string_file styled_filename (current_uiout->can_emit_style_escape ());
	fprintf_styled (&styled_filename,
	file_name_style.style (),
	"%s",
	data->fname);
	std::string message
	= string_printf ("Downloading %.2f MB %s %s", size_in_mb, data->desc,
	styled_filename.c_str());
	data->meter.emplace (current_uiout, message, 1);
	}

	current_uiout->progress ((double)cur / (double)total);

	return 0;
	}

	static debuginfod_client *
	get_debuginfod_client ()
	{
	static debuginfod_client_up global_client;

	if (global_client == nullptr)
	{
	global_client.reset (debuginfod_begin ());

	if (global_client != nullptr)
	debuginfod_set_progressfn (global_client.get (), progressfn);
	}

	return global_client.get ();
	}

	/* Check if debuginfod is enabled. If configured to do so, ask the user
	whether to enable debuginfod. */

	static bool
	debuginfod_is_enabled ()
	{
	const char *urls = getenv (DEBUGINFOD_URLS_ENV_VAR);

	if (urls == nullptr \|\| urls[0] == '\0'
	\|\| debuginfod_enabled == debuginfod_off)
	return false;

	if (debuginfod_enabled == debuginfod_ask)
	{
	int resp = nquery (_("\nThis GDB supports auto-downloading debuginfo " \
	"from the following URLs:\n%s\nEnable debuginfod " \
	"for this session? "),
	urls);
	if (!resp)
	{
	printf_filtered (_("Debuginfod has been disabled.\nTo make this " \
	"setting permanent, add \'set debuginfod " \
	"enabled off\' to .gdbinit.\n"));
	debuginfod_enabled = debuginfod_off;
	return false;
	}

	printf_filtered (_("Debuginfod has been enabled.\nTo make this " \
	"setting permanent, add \'set debuginfod enabled " \
	"on\' to .gdbinit.\n"));
	debuginfod_enabled = debuginfod_on;
	}

	return true;
	}

	/* See debuginfod-support.h */

	scoped_fd
	debuginfod_source_query (const unsigned char *build_id,
	int build_id_len,
	const char *srcpath,
	gdb::unique_xmalloc_ptr<char> *destname)
	{
	if (!debuginfod_is_enabled ())
	return scoped_fd (-ENOSYS);

	debuginfod_client *c = get_debuginfod_client ();

	if (c == nullptr)
	return scoped_fd (-ENOMEM);

	user_data data ("source file", srcpath);

	debuginfod_set_user_data (c, &data);
	scoped_fd fd (debuginfod_find_source (c,
	build_id,
	build_id_len,
	srcpath,
	nullptr));
	debuginfod_set_user_data (c, nullptr);

	if (debuginfod_verbose > 0 && fd.get () < 0 && fd.get () != -ENOENT)
	printf_filtered (_("Download failed: %s. Continuing without source file %ps.\n"),
	safe_strerror (-fd.get ()),
	styled_string (file_name_style.style (), srcpath));

	if (fd.get () >= 0)
	*destname = make_unique_xstrdup (srcpath);

	return fd;
	}

	/* See debuginfod-support.h */

	scoped_fd
	debuginfod_debuginfo_query (const unsigned char *build_id,
	int build_id_len,
	const char *filename,
	gdb::unique_xmalloc_ptr<char> *destname)
	{
	if (!debuginfod_is_enabled ())
	return scoped_fd (-ENOSYS);

	debuginfod_client *c = get_debuginfod_client ();

	if (c == nullptr)
	return scoped_fd (-ENOMEM);

	char *dname = nullptr;
	user_data data ("separate debug info for", filename);

	debuginfod_set_user_data (c, &data);
	scoped_fd fd (debuginfod_find_debuginfo (c, build_id, build_id_len,
	&dname));
	debuginfod_set_user_data (c, nullptr);

	if (debuginfod_verbose > 0 && fd.get () < 0 && fd.get () != -ENOENT)
	printf_filtered (_("Download failed: %s. Continuing without debug info for %ps.\n"),
	safe_strerror (-fd.get ()),
	styled_string (file_name_style.style (), filename));

	if (fd.get () >= 0)
	destname->reset (dname);

	return fd;
	}
	#endif

	/* Set callback for "set debuginfod enabled". */

	static void
	set_debuginfod_enabled (const char *value)
	{
	#if defined(HAVE_LIBDEBUGINFOD)
	debuginfod_enabled = value;
	#else
	error (NO_IMPL);
	#endif
	}

	/* Get callback for "set debuginfod enabled". */

	static const char *
	get_debuginfod_enabled ()
	{
	return debuginfod_enabled;
	}

	/* Show callback for "set debuginfod enabled". */

	static void
	show_debuginfod_enabled (ui_file file, int from_tty, cmd_list_element cmd,
	const char *value)
	{
	printf_unfiltered (_("Debuginfod functionality is currently set to "
	"\"%s\".\n"), debuginfod_enabled);
	}

	/* Set callback for "set debuginfod urls". */

	static void
	set_debuginfod_urls (const std::string &urls)
	{
	#if defined(HAVE_LIBDEBUGINFOD)
	if (setenv (DEBUGINFOD_URLS_ENV_VAR, urls.c_str (), 1) != 0)
	warning (_("Unable to set debuginfod URLs: %s"), safe_strerror (errno));
	#else
	error (NO_IMPL);
	#endif
	}

	/* Get callback for "set debuginfod urls". */

	static const std::string&
	get_debuginfod_urls ()
	{
	static std::string urls;
	#if defined(HAVE_LIBDEBUGINFOD)
	const char *envvar = getenv (DEBUGINFOD_URLS_ENV_VAR);

	if (envvar != nullptr)
	urls = envvar;
	else
	urls.clear ();
	#endif

	return urls;
	}

	/* Show callback for "set debuginfod urls". */

	static void
	show_debuginfod_urls (ui_file file, int from_tty, cmd_list_element cmd,
	const char *value)
	{
	if (value[0] == '\0')
	fprintf_unfiltered (file, _("Debuginfod URLs have not been set.\n"));
	else
	fprintf_filtered (file, _("Debuginfod URLs are currently set to:\n%s\n"),
	value);
	}

	/* Show callback for "set debuginfod verbose". */

	static void
	show_debuginfod_verbose_command (ui_file *file, int from_tty,
	cmd_list_element cmd, const char value)
	{
	fprintf_filtered (file, _("Debuginfod verbose output is set to %s.\n"),
	value);
	}

	/* Register debuginfod commands. */

	void _initialize_debuginfod ();
	void
	_initialize_debuginfod ()
	{
	/* set/show debuginfod */
	add_setshow_prefix_cmd ("debuginfod", class_run,
	_("Set debuginfod options."),
	_("Show debuginfod options."),
	&set_debuginfod_prefix_list,
	&show_debuginfod_prefix_list,
	&setlist, &showlist);

	add_setshow_enum_cmd ("enabled", class_run, debuginfod_enabled_enum,
	_("Set whether to use debuginfod."),
	_("Show whether to use debuginfod."),
	_("\
	When on, enable the use of debuginfod to download missing debug info and\n\
	source files."),
	set_debuginfod_enabled,
	get_debuginfod_enabled,
	show_debuginfod_enabled,
	&set_debuginfod_prefix_list,
	&show_debuginfod_prefix_list);

	/* set/show debuginfod urls */
	add_setshow_string_noescape_cmd ("urls", class_run, _("\
	Set the list of debuginfod server URLs."), _("\
	Show the list of debuginfod server URLs."), _("\
	Manage the space-separated list of debuginfod server URLs that GDB will query \
	when missing debuginfo, executables or source files.\nThe default value is \
	copied from the DEBUGINFOD_URLS environment variable."),
	set_debuginfod_urls,
	get_debuginfod_urls,
	show_debuginfod_urls,
	&set_debuginfod_prefix_list,
	&show_debuginfod_prefix_list);

	/* set/show debuginfod verbose */
	add_setshow_zuinteger_cmd ("verbose", class_support,
	&debuginfod_verbose, _("\
	Set verbosity of debuginfod output."), _("\
	Show debuginfod debugging."), _("\
	When set to a non-zero value, display verbose output for each debuginfod \
	query.\nTo disable, set to zero. Verbose output is displayed by default."),
	nullptr,
	show_debuginfod_verbose_command,
	&set_debuginfod_prefix_list,
	&show_debuginfod_prefix_list);
	}