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128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/* Information collection during ld.so startup.
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Copyright (C) 1995-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _DL_MAIN
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#define _DL_MAIN
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#include <ldsodefs.h>
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#include <limits.h>
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#include <stdlib.h>
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/* Length limits for names and paths, to protect the dynamic linker,
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particularly when __libc_enable_secure is active. */
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#ifdef NAME_MAX
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# define SECURE_NAME_LIMIT NAME_MAX
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#else
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# define SECURE_NAME_LIMIT 255
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#endif
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#ifdef PATH_MAX
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# define SECURE_PATH_LIMIT PATH_MAX
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#else
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# define SECURE_PATH_LIMIT 1024
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#endif
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/* Strings containing colon-separated lists of audit modules. */
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struct audit_list
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{
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/* Array of strings containing colon-separated path lists. Each
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audit module needs its own namespace, so pre-allocate the largest
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possible list. */
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const char *audit_strings[DL_NNS];
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/* Number of entries added to audit_strings. */
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size_t length;
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/* Index into the audit_strings array (for the iteration phase). */
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size_t current_index;
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/* Tail of audit_strings[current_index] which still needs
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processing. */
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const char *current_tail;
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/* Scratch buffer for returning a name which is part of the strings
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in audit_strings. */
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char fname[SECURE_NAME_LIMIT];
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};
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/* This is a list of all the modes the dynamic loader can be in. */
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enum rtld_mode
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{
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rtld_mode_normal, rtld_mode_list, rtld_mode_verify, rtld_mode_trace,
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rtld_mode_list_tunables, rtld_mode_list_diagnostics, rtld_mode_help,
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};
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/* Aggregated state information extracted from environment variables
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and the ld.so command line. */
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struct dl_main_state
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{
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struct audit_list audit_list;
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/* The library search path. */
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const char *library_path;
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/* Where library_path comes from. LD_LIBRARY_PATH or --library-path. */
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const char *library_path_source;
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/* The list preloaded objects from LD_PRELOAD. */
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const char *preloadlist;
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/* The preload list passed as a command argument. */
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const char *preloadarg;
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/* Additional glibc-hwcaps subdirectories to search first.
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Colon-separated list. */
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const char *glibc_hwcaps_prepend;
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/* Mask for the internal glibc-hwcaps subdirectories.
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Colon-separated list. */
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const char *glibc_hwcaps_mask;
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enum rtld_mode mode;
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/* True if program should be also printed for rtld_mode_trace. */
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bool mode_trace_program;
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/* True if information about versions has to be printed. */
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bool version_info;
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};
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/* Helper function to invoke _dl_init_paths with the right arguments
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from *STATE. */
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static inline void
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call_init_paths (const struct dl_main_state *state)
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{
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_dl_init_paths (state->library_path, state->library_path_source,
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state->glibc_hwcaps_prepend, state->glibc_hwcaps_mask);
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}
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/* Print ld.so usage information and exit. */
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_Noreturn void _dl_usage (const char *argv0, const char *wrong_option)
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attribute_hidden;
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/* Print ld.so version information and exit. */
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_Noreturn void _dl_version (void) attribute_hidden;
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/* Print ld.so --help output and exit. */
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_Noreturn void _dl_help (const char *argv0, struct dl_main_state *state)
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attribute_hidden;
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/* Print a diagnostics dump. */
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_Noreturn void _dl_print_diagnostics (char **environ) attribute_hidden;
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#endif /* _DL_MAIN */
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