117 lines
2.7 KiB
C
117 lines
2.7 KiB
C
/* $Id$ */
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/* Copyright (c) 2011 Pierre Pronchery <khorben@defora.org> */
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/* This file is part of DeforaOS System Loader */
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/* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>. */
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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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