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/* Print diagnostics data in ld.so.
Copyright (C) 2021-2024 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
<https://www.gnu.org/licenses/>. */
#include <gnu/lib-names.h>
#include <stdbool.h>
#include <stddef.h>
#include <unistd.h>
#include <dl-diagnostics.h>
#include <dl-hwcaps.h>
#include <dl-main.h>
#include <dl-procinfo.h>
#include <dl-sysdep.h>
#include <ldsodefs.h>
#include "trusted-dirs.h"
#include "version.h"
/* Write CH to standard output. */
static void
_dl_putc (char ch)
{
_dl_write (STDOUT_FILENO, &ch, 1);
}
/* Print CH to standard output, quoting it if necessary. */
static void
print_quoted_char (char ch)
{
if (ch < ' ' || ch > '~')
{
char buf[4];
buf[0] = '\\';
buf[1] = '0' + ((ch >> 6) & 7);
buf[2] = '0' + ((ch >> 6) & 7);
buf[3] = '0' + (ch & 7);
_dl_write (STDOUT_FILENO, buf, 4);
}
else
{
if (ch == '\\' || ch == '"')
_dl_putc ('\\');
_dl_putc (ch);
}
}
/* Print S of LEN bytes to standard output, quoting characters as
needed. */
static void
print_string_length (const char *s, size_t len)
{
_dl_putc ('"');
for (size_t i = 0; i < len; ++i)
print_quoted_char (s[i]);
_dl_putc ('"');
}
void
_dl_diagnostics_print_string (const char *s)
{
if (s == NULL)
{
_dl_printf ("0x0");
return;
}
_dl_putc ('"');
while (*s != '\0')
{
print_quoted_char (*s);
++s;
}
_dl_putc ('"');
}
void
_dl_diagnostics_print_labeled_string (const char *label, const char *s)
{
_dl_printf ("%s=", label);
_dl_diagnostics_print_string (s);
_dl_putc ('\n');
}
void
_dl_diagnostics_print_labeled_value (const char *label, uint64_t value)
{
if (sizeof (value) == sizeof (unsigned long int))
/* _dl_printf can print 64-bit values directly. */
_dl_printf ("%s=0x%lx\n", label, (unsigned long int) value);
else
{
uint32_t high = value >> 32;
uint32_t low = value;
if (high == 0)
_dl_printf ("%s=0x%x\n", label, low);
else
_dl_printf ("%s=0x%x%0*x\n", label, high, 8, low);
}
}
/* Return true if ENV is an unfiltered environment variable. */
static bool
unfiltered_envvar (const char *env, size_t *name_length)
{
char *env_equal = strchr (env, '=');
if (env_equal == NULL)
{
/* Always dump malformed entries. */
*name_length = strlen (env);
return true;
}
size_t envname_length = env_equal - env;
*name_length = envname_length;
/* LC_ and LD_ variables. */
if (env[0] == 'L' && (env[1] == 'C' || env[1] == 'D')
&& env[2] == '_')
return true;
/* MALLOC_ variables. */
if (strncmp (env, "MALLOC_", strlen ("MALLOC_")) == 0)
return true;
static const char unfiltered[] =
"DATEMSK\0"
"GCONV_PATH\0"
"GETCONF_DIR\0"
"GETCONF_DIR\0"
"GLIBC_TUNABLES\0"
"GMON_OUTPUT_PREFIX\0"
"HESIOD_CONFIG\0"
"HES_DOMAIN\0"
"HOSTALIASES\0"
"I18NPATH\0"
"IFS\0"
"LANG\0"
"LOCALDOMAIN\0"
"LOCPATH\0"
"MSGVERB\0"
"NIS_DEFAULTS\0"
"NIS_GROUP\0"
"NIS_PATH\0"
"NLSPATH\0"
"PATH\0"
"POSIXLY_CORRECT\0"
"RESOLV_HOST_CONF\0"
"RES_OPTIONS\0"
"SEV_LEVEL\0"
"TMPDIR\0"
"TZ\0"
"TZDIR\0"
/* Two null bytes at the end to mark the end of the list via an
empty substring. */
;
for (const char *candidate = unfiltered; *candidate != '\0'; )
{
size_t candidate_length = strlen (candidate);
if (candidate_length == envname_length
&& memcmp (candidate, env, candidate_length) == 0)
return true;
candidate += candidate_length + 1;
}
return false;
}
/* Dump the process environment. */
static void
print_environ (char **environ)
{
unsigned int index = 0;
for (char **envp = environ; *envp != NULL; ++envp)
{
char *env = *envp;
size_t name_length;
bool unfiltered = unfiltered_envvar (env, &name_length);
_dl_printf ("env%s[0x%x]=",
unfiltered ? "" : "_filtered", index);
if (unfiltered)
_dl_diagnostics_print_string (env);
else
print_string_length (env, name_length);
_dl_putc ('\n');
++index;
}
}
/* Print configured paths and the built-in search path. */
static void
print_paths (void)
{
_dl_diagnostics_print_labeled_string ("path.prefix", PREFIX);
_dl_diagnostics_print_labeled_string ("path.rtld", RTLD);
_dl_diagnostics_print_labeled_string ("path.sysconfdir", SYSCONFDIR);
unsigned int index = 0;
static const char *system_dirs = SYSTEM_DIRS "\0";
for (const char *e = system_dirs; *e != '\0'; )
{
size_t len = strlen (e);
_dl_printf ("path.system_dirs[0x%x]=", index);
print_string_length (e, len);
_dl_putc ('\n');
++index;
e += len + 1;
}
}
/* Print information about the glibc version. */
static void
print_version (void)
{
_dl_diagnostics_print_labeled_string ("version.release", RELEASE);
_dl_diagnostics_print_labeled_string ("version.version", VERSION);
}
void
_dl_print_diagnostics (char **environ)
{
_dl_diagnostics_print_labeled_string ("dl_dst_lib", DL_DST_LIB);
_dl_diagnostics_print_labeled_value ("dl_hwcap", GLRO (dl_hwcap));
_dl_diagnostics_print_labeled_value ("dl_hwcap_important", HWCAP_IMPORTANT);
_dl_diagnostics_print_labeled_value ("dl_hwcap2", GLRO (dl_hwcap2));
_dl_diagnostics_print_labeled_value ("dl_hwcap3", GLRO (dl_hwcap3));
_dl_diagnostics_print_labeled_value ("dl_hwcap4", GLRO (dl_hwcap4));
_dl_diagnostics_print_labeled_string
("dl_hwcaps_subdirs", _dl_hwcaps_subdirs);
_dl_diagnostics_print_labeled_value
("dl_hwcaps_subdirs_active", _dl_hwcaps_subdirs_active ());
_dl_diagnostics_print_labeled_value ("dl_pagesize", GLRO (dl_pagesize));
_dl_diagnostics_print_labeled_string ("dl_platform", GLRO (dl_platform));
_dl_diagnostics_print_labeled_string
("dl_profile_output", GLRO (dl_profile_output));
_dl_diagnostics_print_labeled_string ("dso.ld", LD_SO);
_dl_diagnostics_print_labeled_string ("dso.libc", LIBC_SO);
print_environ (environ);
print_paths ();
print_version ();
_dl_diagnostics_kernel ();
_dl_diagnostics_cpu ();
_exit (EXIT_SUCCESS);
}
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