130 lines
3.5 KiB
C
130 lines
3.5 KiB
C
/* $Id$ */
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/* Copyright (c) 2010-2021 Pierre Pronchery <khorben@defora.org> */
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/* This file is part of DeforaOS System Loader */
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/* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <elf.h>
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/* private */
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/* prototypes */
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static int _error(char const * error1, char const * error2, int ret);
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static int _ldd(char const * filename, char const * ldpath);
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#undef ELFSIZE
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#define ELFSIZE 32
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#include "elf.c"
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#undef ELFSIZE
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#define ELFSIZE 64
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#include "elf.c"
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static int _usage(void);
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/* public */
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/* functions */
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/* main */
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int main(int argc, char * argv[])
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{
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int ret = 0;
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int o;
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int i;
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char const * ldpath;
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while((o = getopt(argc, argv, "")) != -1)
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switch(o)
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{
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default:
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return _usage();
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}
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if(optind == argc)
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return _usage();
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ldpath = getenv("LD_LIBRARY_PATH");
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for(i = optind; i < argc; i++)
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ret |= _ldd(argv[i], ldpath);
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return (ret == 0) ? 0 : 2;
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}
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/* private */
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/* functions */
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/* ldd */
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static int _ldd(char const * filename, char const * ldpath)
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{
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int ret = 1;
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FILE * fp;
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union
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{
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unsigned char e_ident[EI_NIDENT];
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Elf32_Ehdr ehdr32;
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Elf64_Ehdr ehdr64;
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} elf;
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if((fp = fopen(filename, "r")) == NULL)
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return _error(filename, strerror(errno), 1);
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if(fread(&elf, sizeof(elf), 1, fp) == 1)
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{
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if(memcmp(elf.e_ident, ELFMAG, SELFMAG) != 0)
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ret = -_error(filename, "Not an ELF file", 1);
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else if(elf.e_ident[EI_CLASS] == ELFCLASS32)
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ret = _do_ldd32(filename, fp, &elf.ehdr32, ldpath);
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else if(elf.e_ident[EI_CLASS] == ELFCLASS64)
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ret = _do_ldd64(filename, fp, &elf.ehdr64, ldpath);
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else
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ret = -_error(filename, "Could not determine ELF class",
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1);
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}
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else if(ferror(fp) != 0)
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ret = -_error(filename, strerror(errno), 1);
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else
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ret = -_error(filename, "Not an ELF file", 1);
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if(fclose(fp) != 0)
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ret = -_error(filename, strerror(errno), 1);
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return ret;
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}
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/* error */
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static int _error(char const * error1, char const * error2, int ret)
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{
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fprintf(stderr, "%s: %s%s%s\n", "ldd", error1, (error2 != NULL) ? ": "
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: "", (error2 != NULL) ? error2 : "");
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return ret;
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}
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/* usage */
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static int _usage(void)
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{
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fputs("Usage: ldd filename...\n", stderr);
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return 1;
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}
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