diff --git a/src/Makefile.am b/src/Makefile.am
index 2b1c0dcb..69ac4dbe 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -26,7 +26,8 @@ AM_CPPFLAGS += -I$(srcdir)/../libelf -I$(srcdir)/../libebl \
AM_LDFLAGS = -Wl,-rpath-link,../libelf:../libdw
bin_PROGRAMS = readelf nm size strip elflint findtextrel addr2line \
- elfcmp objdump ranlib strings ar unstrip stack elfcompress
+ elfcmp objdump ranlib strings ar unstrip stack elfcompress \
+ elfclassify
noinst_LIBRARIES = libar.a
@@ -83,6 +84,7 @@ ar_LDADD = libar.a $(libelf) $(libeu) $(argp_LDADD)
unstrip_LDADD = $(libebl) $(libelf) $(libdw) $(libeu) $(argp_LDADD) -ldl
stack_LDADD = $(libebl) $(libelf) $(libdw) $(libeu) $(argp_LDADD) -ldl $(demanglelib)
elfcompress_LDADD = $(libebl) $(libelf) $(libdw) $(libeu) $(argp_LDADD)
+elfclassify_LDADD = $(libelf) $(libdw) $(libeu) $(argp_LDADD)
installcheck-binPROGRAMS: $(bin_PROGRAMS)
bad=0; pid=$$$$; list="$(bin_PROGRAMS)"; for p in $$list; do \
diff --git a/src/elfclassify.c b/src/elfclassify.c
new file mode 100644
index 00000000..83a97d47
--- /dev/null
+++ b/src/elfclassify.c
@@ -0,0 +1,989 @@
+/* Classification of ELF files.
+ Copyright (C) 2019 Red Hat, Inc.
+ This file is part of elfutils.
+
+ This file 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.
+
+ elfutils 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 . */
+
+#include
+
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+
+#include ELFUTILS_HEADER(elf)
+#include ELFUTILS_HEADER(dwelf)
+#include "printversion.h"
+
+/* Name and version of program. */
+ARGP_PROGRAM_VERSION_HOOK_DEF = print_version;
+
+/* Bug report address. */
+ARGP_PROGRAM_BUG_ADDRESS_DEF = PACKAGE_BUGREPORT;
+
+/* Set by parse_opt. */
+static int verbose;
+
+/* Set by the main function. */
+static const char *current_path;
+
+/* Set by open_file. */
+static int file_fd = -1;
+
+/* Set by issue or elf_issue. */
+static bool issue_found;
+
+/* Non-fatal issue occured while processing the current_path. */
+static void
+issue (int e, const char *msg)
+{
+ if (verbose >= 0)
+ {
+ if (current_path == NULL)
+ error (0, e, "%s", msg);
+ else
+ error (0, e, "%s '%s'", msg, current_path);
+ }
+ issue_found = true;
+}
+
+/* Non-fatal issue occured while processing the current ELF. */
+static void
+elf_issue (const char *msg)
+{
+ if (verbose >= 0)
+ error (0, 0, "%s: %s: '%s'", msg, elf_errmsg (-1), current_path);
+ issue_found = true;
+}
+
+/* Set by parse_opt. */
+static bool flag_only_regular_files;
+
+static bool
+open_file (void)
+{
+ if (verbose > 1)
+ fprintf (stderr, "debug: processing file: %s\n", current_path);
+
+ file_fd = open (current_path, O_RDONLY | (flag_only_regular_files
+ ? O_NOFOLLOW : 0));
+ if (file_fd < 0)
+ {
+ if (!flag_only_regular_files || errno != ELOOP)
+ issue (errno, N_("opening"));
+ return false;
+ }
+
+ struct stat st;
+ if (fstat (file_fd, &st) != 0)
+ {
+ issue (errno, N_("reading"));
+ return false;
+ }
+
+ /* Don't even bother with directories. */
+ if (S_ISDIR (st.st_mode)
+ || (flag_only_regular_files && !S_ISREG (st.st_mode)))
+ return false;
+
+ return true;
+}
+
+static void
+close_file (void)
+{
+ if (file_fd >= 0)
+ {
+ close (file_fd);
+ file_fd = -1;
+ }
+}
+
+/* Set by open_elf. */
+static Elf *elf;
+
+/* Set by parse_opt. */
+static bool flag_compressed;
+
+static bool
+open_elf (void)
+{
+ if (!open_file ())
+ {
+ /* Make sure the file descriptor is gone. */
+ close_file ();
+ return false;
+ }
+
+ if (flag_compressed)
+ elf = dwelf_elf_begin (file_fd);
+ else
+ elf = elf_begin (file_fd, ELF_C_READ, NULL);
+
+ if (elf == NULL)
+ {
+ /* This likely means it just isn't an ELF file, probably not a
+ real issue, but warn if verbose reporting. */
+ if (verbose > 0)
+ fprintf (stderr, "warning: %s: %s\n", current_path, elf_errmsg (-1));
+ return false;
+ }
+
+ return true;
+}
+
+static void
+close_elf (void)
+{
+ if (elf != NULL)
+ {
+ elf_end (elf);
+ elf = NULL;
+ }
+
+ close_file ();
+}
+
+static const char *
+elf_kind_string (int kind)
+{
+ switch (kind)
+ {
+ case ELF_K_NONE:
+ return "ELF_K_NONE";
+ case ELF_K_AR:
+ return "ELF_K_AR";
+ case ELF_K_COFF:
+ return "ELF_K_COFF"; /* libelf doesn't really support this. */
+ case ELF_K_ELF:
+ return "ELF_K_ELF";
+ default:
+ return "";
+ }
+}
+
+static const char *
+elf_type_string (int type)
+{
+ switch (type)
+ {
+ case ET_NONE:
+ return "ET_NONE";
+ case ET_REL:
+ return "ET_REL";
+ case ET_EXEC:
+ return "ET_EXEC";
+ case ET_DYN:
+ return "ET_DYN";
+ case ET_CORE:
+ return "ET_CORE";
+ default:
+ return "";
+ }
+}
+
+static int elf_type;
+static bool has_program_load;
+static bool has_progbits_alloc;
+static bool has_program_interpreter;
+static bool has_dynamic;
+static bool has_soname;
+static bool has_pie_flag;
+static bool has_dt_debug;
+static bool has_symtab;
+static bool has_debug_sections;
+static bool has_modinfo;
+static bool has_gnu_linkonce_this_module;
+
+static bool
+run_classify (void)
+{
+ /* Reset to unanalyzed default. */
+ elf_type = 0;
+ has_program_load = false;
+ has_progbits_alloc = false;
+ has_program_interpreter = false;
+ has_dynamic = false;
+ has_soname = false;
+ has_pie_flag = false;
+ has_dt_debug = false;
+ has_symtab = false;
+ has_debug_sections = false;
+ has_modinfo = false;
+ has_gnu_linkonce_this_module = false;
+
+ int kind = elf_kind (elf);
+ if (verbose > 0)
+ fprintf (stderr, "info: %s: ELF kind: %s (0x%x)\n", current_path,
+ elf_kind_string (kind), kind);
+ if (kind != ELF_K_ELF)
+ return true;
+
+ GElf_Ehdr ehdr_storage;
+ GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_storage);
+ if (ehdr == NULL)
+ {
+ elf_issue (N_("ELF header"));
+ return false;
+ }
+ elf_type = ehdr->e_type;
+
+ /* Examine program headers. */
+ {
+ size_t nphdrs;
+ if (elf_getphdrnum (elf, &nphdrs) != 0)
+ {
+ elf_issue (N_("program headers"));
+ return false;
+ }
+ for (size_t phdr_idx = 0; phdr_idx < nphdrs; ++phdr_idx)
+ {
+ GElf_Phdr phdr_storage;
+ GElf_Phdr *phdr = gelf_getphdr (elf, phdr_idx, &phdr_storage);
+ if (phdr == NULL)
+ {
+ elf_issue (N_("program header"));
+ return false;
+ }
+ if (phdr->p_type == PT_DYNAMIC)
+ has_dynamic = true;
+ if (phdr->p_type == PT_INTERP)
+ has_program_interpreter = true;
+ if (phdr->p_type == PT_LOAD)
+ has_program_load = true;
+ }
+ }
+
+ Elf_Scn *dyn_section = NULL;
+ {
+ size_t shstrndx;
+ if (unlikely (elf_getshdrstrndx (elf, &shstrndx) < 0))
+ {
+ elf_issue (N_("section header string table index"));
+ return false;
+ }
+
+ Elf_Scn *scn = NULL;
+ while (true)
+ {
+ scn = elf_nextscn (elf, scn);
+ if (scn == NULL)
+ break;
+ GElf_Shdr shdr_storage;
+ GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_storage);
+ if (shdr == NULL)
+ {
+ elf_issue (N_("could not obtain section header"));
+ return false;
+ }
+ const char *section_name = elf_strptr (elf, shstrndx, shdr->sh_name);
+ if (section_name == NULL)
+ {
+ elf_issue(N_("could not obtain section name"));
+ return false;
+ }
+ if (verbose > 2)
+ fprintf (stderr, "debug: section header %s (type %d) found\n",
+ section_name, shdr->sh_type);
+ if (shdr->sh_type == SHT_DYNAMIC)
+ {
+ if (verbose > 1)
+ fputs ("debug: dynamic section found\n", stderr);
+ dyn_section = scn;
+ }
+ if (shdr->sh_type == SHT_SYMTAB)
+ {
+ if (verbose > 1)
+ fputs ("debug: symtab section found\n", stderr);
+ has_symtab = true;
+ }
+ if (shdr->sh_type == SHT_PROGBITS && (shdr->sh_flags & SHF_ALLOC) != 0)
+ {
+ if (verbose > 1 && !has_progbits_alloc)
+ fputs ("debug: allocated PROGBITS section found\n", stderr);
+ has_progbits_alloc = true;
+ }
+ const char *debug_prefix = ".debug_";
+ if (strncmp (section_name, debug_prefix, strlen (debug_prefix)) == 0)
+ {
+ if (verbose > 1 && !has_debug_sections)
+ fputs ("debug: .debug_* section found\n", stderr);
+ has_debug_sections = true;
+ }
+ if (strcmp (section_name, ".modinfo") == 0)
+ {
+ if (verbose > 1)
+ fputs ("debug: .modinfo section found\n", stderr);
+ has_modinfo = true;
+ }
+ if (strcmp (section_name, ".gnu.linkonce.this_module") == 0)
+ {
+ if (verbose > 1)
+ fputs ("debug: .gnu.linkonce.this_module section found\n",
+ stderr);
+ has_gnu_linkonce_this_module = true;
+ }
+ }
+ }
+
+ /* Examine the dynamic section. */
+ if (has_dynamic)
+ {
+ if (dyn_section != NULL)
+ {
+ Elf_Data *data = elf_getdata (dyn_section, NULL);
+ if (verbose > 2)
+ fprintf (stderr, "debug: Elf_Data for dynamic section: %p\n",
+ data);
+
+ if (data != NULL)
+ for (int dyn_idx = 0; ; ++dyn_idx)
+ {
+ GElf_Dyn dyn_storage;
+ GElf_Dyn *dyn = gelf_getdyn (data, dyn_idx, &dyn_storage);
+ if (dyn == NULL)
+ break;
+ if (verbose > 2)
+ fprintf (stderr, "debug: dynamic entry %d"
+ " with tag %llu found\n",
+ dyn_idx, (unsigned long long int) dyn->d_tag);
+ if (dyn->d_tag == DT_SONAME)
+ has_soname = true;
+ if (dyn->d_tag == DT_FLAGS_1 && (dyn->d_un.d_val & DF_1_PIE))
+ has_pie_flag = true;
+ if (dyn->d_tag == DT_DEBUG)
+ has_dt_debug = true;
+ if (dyn->d_tag == DT_NULL)
+ break;
+ }
+ }
+ }
+
+ if (verbose > 0)
+ {
+ fprintf (stderr, "info: %s: ELF type: %s (0x%x)\n", current_path,
+ elf_type_string (elf_type), elf_type);
+ if (has_program_load)
+ fprintf (stderr, "info: %s: PT_LOAD found\n", current_path);
+ if (has_progbits_alloc)
+ fprintf (stderr, "info: %s: allocated PROGBITS section found\n",
+ current_path);
+ if (has_program_interpreter)
+ fprintf (stderr, "info: %s: program interpreter found\n",
+ current_path);
+ if (has_dynamic)
+ fprintf (stderr, "info: %s: dynamic segment found\n", current_path);
+ if (has_soname)
+ fprintf (stderr, "info: %s: soname found\n", current_path);
+ if (has_pie_flag)
+ fprintf (stderr, "info: %s: DF_1_PIE flag found\n", current_path);
+ if (has_dt_debug)
+ fprintf (stderr, "info: %s: DT_DEBUG found\n", current_path);
+ if (has_symtab)
+ fprintf (stderr, "info: %s: symbol table found\n", current_path);
+ if (has_debug_sections)
+ fprintf (stderr, "info: %s: .debug_* section found\n", current_path);
+ if (has_modinfo)
+ fprintf (stderr, "info: %s: .modinfo section found\n", current_path);
+ if (has_gnu_linkonce_this_module)
+ fprintf (stderr,
+ "info: %s: .gnu.linkonce.this_module section found\n",
+ current_path);
+ }
+
+ return true;
+}
+
+static bool
+is_elf (void)
+{
+ return elf_kind (elf) != ELF_K_NONE;
+}
+
+static bool
+is_elf_file (void)
+{
+ return elf_kind (elf) == ELF_K_ELF;
+}
+
+static bool
+is_elf_archive (void)
+{
+ return elf_kind (elf) == ELF_K_AR;
+}
+
+static bool
+is_core (void)
+{
+ return elf_kind (elf) == ELF_K_ELF && elf_type == ET_CORE;
+}
+
+/* Return true if the file is a loadable object, which basically means
+ it is an ELF file, but not a relocatable object or a core dump
+ file. (The kernel and various userspace components can load ET_REL
+ files, but we disregard that for our classification purposes.) */
+static bool
+is_loadable (void)
+{
+ return elf_kind (elf) == ELF_K_ELF
+ && (elf_type == ET_EXEC || elf_type == ET_DYN)
+ && has_program_load;
+}
+
+/* Return true if the file is an ELF file which has a symbol table or
+ .debug_* sections (and thus can be stripped futher). */
+static bool
+is_unstripped (void)
+{
+ return elf_kind (elf) != ELF_K_NONE
+ && (elf_type == ET_REL || elf_type == ET_EXEC || elf_type == ET_DYN)
+ && (has_symtab || has_debug_sections);
+}
+
+/* Return true if the file contains only debuginfo, but no loadable
+ program bits. Then it is most likely a separate .debug file, a dwz
+ multi-file or a .dwo file. Note that it can still be loadable,
+ but in that case the phdrs shouldn't be trusted. */
+static bool
+is_debug_only (void)
+{
+ return elf_kind (elf) != ELF_K_NONE
+ && (elf_type == ET_REL || elf_type == ET_EXEC || elf_type == ET_DYN)
+ && has_debug_sections
+ && !has_progbits_alloc;
+}
+
+static bool
+is_shared (void)
+{
+ if (!is_loadable ())
+ return false;
+
+ /* The ELF type is very clear: this is an executable. */
+ if (elf_type == ET_EXEC)
+ return false;
+
+ /* If the object is marked as PIE, it is definitely an executable,
+ and not a loadlable shared object. */
+ if (has_pie_flag)
+ return false;
+
+ /* Treat a DT_SONAME tag as a strong indicator that this is a shared
+ object. */
+ if (has_soname)
+ return true;
+
+ /* This is probably a PIE program: there is no soname, but a program
+ interpreter. In theory, this file could be also a DSO with a
+ soname implied by its file name that can be run as a program.
+ This situation is impossible to resolve in the general case. */
+ if (has_program_interpreter)
+ return false;
+
+ /* Roland McGrath mentions in
+ ,
+ that “we defined a PIE as an ET_DYN with a DT_DEBUG”. This
+ matches current binutils behavior (version 2.32). DT_DEBUG is
+ added if bfd_link_executable returns true or if bfd_link_pic
+ returns false, depending on the architectures. However, DT_DEBUG
+ is not documented as being specific to executables, therefore use
+ it only as a low-priority discriminator. */
+ if (has_dt_debug)
+ return false;
+
+ /* If there is no dynamic section, the file cannot be loaded as a
+ shared object. */
+ if (!has_dynamic)
+ return false;
+ return true;
+}
+
+static bool
+is_executable (void)
+{
+ if (!is_loadable ())
+ return false;
+
+ /* A loadable object which is not a shared object is treated as an
+ executable. */
+ return !is_shared ();
+}
+
+/* Like is_executable, but the object can also be a shared library at
+ the same time. */
+static bool
+is_program (void)
+{
+ if (!is_loadable ())
+ return false;
+
+ /* The ELF type is very clear: this is an executable. */
+ if (elf_type == ET_EXEC)
+ return true;
+
+ /* If the object is marked as PIE, it is definitely an executable,
+ and not a loadlable shared object. */
+ if (has_pie_flag)
+ return true;
+
+ /* This is probably a PIE program. It isn't ET_EXEC, but has a
+ program interpreter. In theory, this file could be also a DSO
+ with a soname. This situation is impossible to resolve in the
+ general case. See is_shared. This is different from
+ is_executable. */
+ if (has_program_interpreter)
+ return true;
+
+ /* Roland McGrath mentions in
+ ,
+ that “we defined a PIE as an ET_DYN with a DT_DEBUG”. This
+ matches current binutils behavior (version 2.32). DT_DEBUG is
+ added if bfd_link_executable returns true or if bfd_link_pic
+ returns false, depending on the architectures. However, DT_DEBUG
+ is not documented as being specific to executables, therefore use
+ it only as a low-priority discriminator. */
+ if (has_dt_debug)
+ return true;
+
+ return false;
+}
+
+/* Returns true if the file is a linux kernel module (is ET_REL and
+ has the two magic sections .modinfo and .gnu.linkonce.this_module). */
+static bool
+is_linux_kernel_module (void)
+{
+ return (elf_kind (elf) == ELF_K_ELF
+ && elf_type == ET_REL
+ && has_modinfo
+ && has_gnu_linkonce_this_module);
+}
+
+enum classify_requirement { do_not_care, required, forbidden };
+
+enum classify_check
+{
+ classify_elf,
+ classify_elf_file,
+ classify_elf_archive,
+ classify_core,
+ classify_unstripped,
+ classify_executable,
+ classify_program,
+ classify_shared,
+ classify_linux_kernel_module,
+ classify_debug_only,
+ classify_loadable,
+
+ classify_check_last = classify_loadable
+};
+
+enum
+{
+ classify_check_offset = 1000,
+ classify_check_not_offset = 2000,
+
+ classify_flag_stdin = 3000,
+ classify_flag_stdin0,
+ classify_flag_no_stdin,
+ classify_flag_print,
+ classify_flag_print0,
+ classify_flag_no_print,
+ classify_flag_matching,
+ classify_flag_not_matching,
+};
+
+static bool
+classify_check_positive (int key)
+{
+ return key >= classify_check_offset
+ && key <= classify_check_offset + classify_check_last;
+}
+
+static bool
+classify_check_negative (int key)
+{
+ return key >= classify_check_not_offset
+ && key <= classify_check_not_offset + classify_check_last;
+}
+
+/* Set by parse_opt. */
+static enum classify_requirement requirements[classify_check_last + 1];
+static enum { no_stdin, do_stdin, do_stdin0 } flag_stdin;
+static enum { no_print, do_print, do_print0 } flag_print;
+static bool flag_print_matching = true;
+
+static error_t
+parse_opt (int key, char *arg __attribute__ ((unused)),
+ struct argp_state *state __attribute__ ((unused)))
+{
+ if (classify_check_positive (key))
+ requirements[key - classify_check_offset] = required;
+ else if (classify_check_negative (key))
+ requirements[key - classify_check_not_offset] = forbidden;
+ else
+ switch (key)
+ {
+ case 'v':
+ ++verbose;
+ break;
+
+ case 'q':
+ --verbose;
+ break;
+
+ case 'z':
+ flag_compressed = true;
+ break;
+
+ case 'f':
+ flag_only_regular_files = true;
+ break;
+
+ case classify_flag_stdin:
+ flag_stdin = do_stdin;
+ break;
+
+ case classify_flag_stdin0:
+ flag_stdin = do_stdin0;
+ break;
+
+ case classify_flag_no_stdin:
+ flag_stdin = no_stdin;
+ break;
+
+ case classify_flag_print:
+ flag_print = do_print;
+ break;
+
+ case classify_flag_print0:
+ flag_print = do_print0;
+ break;
+
+ case classify_flag_no_print:
+ flag_print = no_print;
+ break;
+
+ case classify_flag_matching:
+ flag_print_matching = true;
+ break;
+
+ case classify_flag_not_matching:
+ flag_print_matching = false;
+ break;
+
+ default:
+ return ARGP_ERR_UNKNOWN;
+ }
+
+ return 0;
+}
+
+/* Perform requested checks against the file at current_path. If
+ necessary, sets *STATUS to 1 if checks failed. */
+static void
+process_current_path (int *status)
+{
+ bool checks_passed = true;
+
+ if (open_elf () && run_classify ())
+ {
+ bool checks[] =
+ {
+ [classify_elf] = is_elf (),
+ [classify_elf_file] = is_elf_file (),
+ [classify_elf_archive] = is_elf_archive (),
+ [classify_core] = is_core (),
+ [classify_unstripped] = is_unstripped (),
+ [classify_executable] = is_executable (),
+ [classify_program] = is_program (),
+ [classify_shared] = is_shared (),
+ [classify_linux_kernel_module] = is_linux_kernel_module (),
+ [classify_debug_only] = is_debug_only (),
+ [classify_loadable] = is_loadable (),
+ };
+
+ if (verbose > 1)
+ {
+ if (checks[classify_elf])
+ fprintf (stderr, "debug: %s: elf\n", current_path);
+ if (checks[classify_elf_file])
+ fprintf (stderr, "debug: %s: elf_file\n", current_path);
+ if (checks[classify_elf_archive])
+ fprintf (stderr, "debug: %s: elf_archive\n", current_path);
+ if (checks[classify_core])
+ fprintf (stderr, "debug: %s: core\n", current_path);
+ if (checks[classify_unstripped])
+ fprintf (stderr, "debug: %s: unstripped\n", current_path);
+ if (checks[classify_executable])
+ fprintf (stderr, "debug: %s: executable\n", current_path);
+ if (checks[classify_program])
+ fprintf (stderr, "debug: %s: program\n", current_path);
+ if (checks[classify_shared])
+ fprintf (stderr, "debug: %s: shared\n", current_path);
+ if (checks[classify_linux_kernel_module])
+ fprintf (stderr, "debug: %s: linux kernel module\n", current_path);
+ if (checks[classify_debug_only])
+ fprintf (stderr, "debug: %s: debug-only\n", current_path);
+ if (checks[classify_loadable])
+ fprintf (stderr, "debug: %s: loadable\n", current_path);
+ }
+
+ for (enum classify_check check = 0;
+ check <= classify_check_last; ++check)
+ switch (requirements[check])
+ {
+ case required:
+ if (!checks[check])
+ checks_passed = false;
+ break;
+ case forbidden:
+ if (checks[check])
+ checks_passed = false;
+ break;
+ case do_not_care:
+ break;
+ }
+ }
+ else if (file_fd == -1)
+ checks_passed = false; /* There is nothing to check, bad file. */
+ else
+ {
+ for (enum classify_check check = 0;
+ check <= classify_check_last; ++check)
+ if (requirements[check] == required)
+ checks_passed = false;
+ }
+
+ close_elf ();
+
+ switch (flag_print)
+ {
+ case do_print:
+ if (checks_passed == flag_print_matching)
+ puts (current_path);
+ break;
+ case do_print0:
+ if (checks_passed == flag_print_matching)
+ fwrite (current_path, strlen (current_path) + 1, 1, stdout);
+ break;
+ case no_print:
+ if (!checks_passed)
+ *status = 1;
+ break;
+ }
+}
+
+/* Called to process standard input if flag_stdin is not no_stdin. */
+static void
+process_stdin (int *status)
+{
+ char delim;
+ if (flag_stdin == do_stdin0)
+ delim = '\0';
+ else
+ delim = '\n';
+
+ char *buffer = NULL;
+ size_t buffer_size = 0;
+ while (true)
+ {
+ ssize_t ret = getdelim (&buffer, &buffer_size, delim, stdin);
+ if (ferror (stdin))
+ {
+ current_path = NULL;
+ issue (errno, N_("reading from standard input"));
+ break;
+ }
+ if (feof (stdin))
+ break;
+ if (ret < 0)
+ abort (); /* Cannot happen due to error checks above. */
+ if (delim != '\0' && ret > 0)
+ buffer[ret - 1] = '\0';
+ current_path = buffer;
+ process_current_path (status);
+ }
+
+ free (buffer);
+}
+
+int
+main (int argc, char **argv)
+{
+ const struct argp_option options[] =
+ {
+ { NULL, 0, NULL, OPTION_DOC, N_("Classification options"), 1 },
+ { "elf", classify_check_offset + classify_elf, NULL, 0,
+ N_("File looks like an ELF object or archive/static library (default)")
+ , 1 },
+ { "elf-file", classify_check_offset + classify_elf_file, NULL, 0,
+ N_("File is an regular ELF object (not an archive/static library")
+ , 1 },
+ { "elf-archive", classify_check_offset + classify_elf_archive, NULL, 0,
+ N_("File is an ELF archive or static library")
+ , 1 },
+ { "core", classify_check_offset + classify_core, NULL, 0,
+ N_("File is an ELF core dump file")
+ , 1 },
+ { "unstripped", classify_check_offset + classify_unstripped, NULL, 0,
+ N_("File is an ELF file with symbol table or .debug_* sections \
+and can be stripped further"), 1 },
+ { "executable", classify_check_offset + classify_executable, NULL, 0,
+ N_("File is an ELF program executable \
+(and not also a shared library)"), 1 },
+ { "program", classify_check_offset + classify_program, NULL, 0,
+ N_("File is an ELF program executable \
+(might also be a shared library)"), 1 },
+ { "shared", classify_check_offset + classify_shared, NULL, 0,
+ N_("File is an ELF shared object (DSO)"), 1 },
+ { "linux-kernel-module", (classify_check_offset
+ + classify_linux_kernel_module), NULL, 0,
+ N_("File is a linux kernel module"), 1 },
+ { "debug-only", (classify_check_offset + classify_debug_only), NULL, 0,
+ N_("File is a debug only ELF file \
+(separate .debug, .dwo or dwz multi-file)"), 1 },
+ { "loadable", classify_check_offset + classify_loadable, NULL, 0,
+ N_("File is a loadable ELF object (program or shared object)"), 1 },
+
+ /* Negated versions of the above. */
+ { "not-elf", classify_check_not_offset + classify_elf,
+ NULL, OPTION_HIDDEN, NULL, 1 },
+ { "not-elf-file", classify_check_not_offset + classify_elf_file,
+ NULL, OPTION_HIDDEN, NULL, 1 },
+ { "not-elf-archive", classify_check_not_offset + classify_elf_archive,
+ NULL, OPTION_HIDDEN, NULL, 1 },
+ { "not-core", classify_check_not_offset + classify_core,
+ NULL, OPTION_HIDDEN, NULL, 1 },
+ { "not-unstripped", classify_check_not_offset + classify_unstripped,
+ NULL, OPTION_HIDDEN, NULL, 1 },
+ { "not-executable", classify_check_not_offset + classify_executable,
+ NULL, OPTION_HIDDEN, NULL, 1 },
+ { "not-program", classify_check_not_offset + classify_program,
+ NULL, OPTION_HIDDEN, NULL, 1 },
+ { "not-shared", classify_check_not_offset + classify_shared,
+ NULL, OPTION_HIDDEN, NULL, 1 },
+ { "not-linux-kernel-module", (classify_check_not_offset
+ + classify_linux_kernel_module),
+ NULL, OPTION_HIDDEN, NULL, 1 },
+ { "not-debug-only", (classify_check_not_offset + classify_debug_only),
+ NULL, OPTION_HIDDEN, NULL, 1 },
+ { "not-loadable", classify_check_not_offset + classify_loadable,
+ NULL, OPTION_HIDDEN, NULL, 1 },
+
+ { NULL, 0, NULL, OPTION_DOC, N_("Input flags"), 2 },
+ { "file", 'f', NULL, 0,
+ N_("Only classify regular (not symlink nor special device) files"), 2 },
+ { "stdin", classify_flag_stdin, NULL, 0,
+ N_("Also read file names to process from standard input, \
+separated by newlines"), 2 },
+ { "stdin0", classify_flag_stdin0, NULL, 0,
+ N_("Also read file names to process from standard input, \
+separated by ASCII NUL bytes"), 2 },
+ { "no-stdin", classify_flag_stdin, NULL, 0,
+ N_("Do not read files from standard input (default)"), 2 },
+ { "compressed", 'z', NULL, 0,
+ N_("Try to open compressed files or embedded (kernel) ELF images"),
+ 2 },
+
+ { NULL, 0, NULL, OPTION_DOC, N_("Output flags"), 3 },
+ { "print", classify_flag_print, NULL, 0,
+ N_("Output names of files, separated by newline"), 3 },
+ { "print0", classify_flag_print0, NULL, 0,
+ N_("Output names of files, separated by ASCII NUL"), 3 },
+ { "no-print", classify_flag_no_print, NULL, 0,
+ N_("Do not output file names"), 3 },
+ { "matching", classify_flag_matching, NULL, 0,
+ N_("If printing file names, print matching files (default)"), 3 },
+ { "not-matching", classify_flag_not_matching, NULL, 0,
+ N_("If printing file names, print files that do not match"), 3 },
+
+ { NULL, 0, NULL, OPTION_DOC, N_("Additional flags"), 4 },
+ { "verbose", 'v', NULL, 0,
+ N_("Output additional information (can be specified multiple times)"), 4 },
+ { "quiet", 'q', NULL, 0,
+ N_("Suppress some error output (counterpart to --verbose)"), 4 },
+ { NULL, 0, NULL, 0, NULL, 0 }
+ };
+
+ const struct argp argp =
+ {
+ .options = options,
+ .parser = parse_opt,
+ .args_doc = N_("FILE..."),
+ .doc = N_("\
+Determine the type of an ELF file.\
+\n\n\
+All of the classification options must apply at the same time to a \
+particular file. Classification options can be negated using a \
+\"--not-\" prefix.\
+\n\n\
+Since modern ELF does not clearly distinguish between programs and \
+dynamic shared objects, you should normally use either --executable or \
+--shared to identify the primary purpose of a file. \
+Only one of the --shared and --executable checks can pass for a file. \
+If you want to know whether an ELF object might be both a program and a \
+shared library at the same time use --program --shared. \
+--executable is effectively the same as --program --not-shared.\
+\n\n\
+Without any of the --print options, the program exits with status 0 \
+if the requested checks pass for all input files, with 1 if a check \
+fails for any file, and 2 if there is an environmental issue (such \
+as a file read error or a memory allocation error).\
+\n\n\
+When printing file names, the program exits with status 0 even if \
+no file names are printed, and exits with status 2 if there is an \
+environmental issue.\
+\n\n\
+On usage error (e.g. a bad option was given), the program exits with \
+a status code of 64.\
+\n\n\
+The --quiet or -q option suppresses some error warning output, but \
+doesn't change the exit status.\
+")
+ };
+
+ /* Require that the file is an ELF file by default. User can
+ disable with --not-elf. */
+ requirements[classify_elf] = required;
+
+ int remaining;
+ if (argp_parse (&argp, argc, argv, 0, &remaining, NULL) != 0)
+ return 2;
+
+ elf_version (EV_CURRENT);
+
+ int status = 0;
+
+ for (int i = remaining; i < argc; ++i)
+ {
+ current_path = argv[i];
+ process_current_path (&status);
+ }
+
+ if (flag_stdin != no_stdin)
+ process_stdin (&status);
+
+ if (issue_found)
+ return 2;
+
+ return status;
+}