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/* This file is part of centaur.
*
* centaur is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License 2 as
* published by the Free Software Foundation.
* centaur 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 centaur. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <libelf.h>
#include "elfhandle.h"
void openElf(ELFHandles *h, char *fn, Elf_Cmd elfmode)
{
int openflags = 0;
int openmode = 0;
h->e = NULL;
switch(elfmode) {
case ELF_C_READ:
openflags = O_RDONLY;
break;
case ELF_C_WRITE:
openflags = O_WRONLY | O_CREAT;
openmode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
break;
case ELF_C_RDWR:
openflags = O_RDWR;
break;
default:
return;
}
h->fd = open(fn, openflags, openmode);
if (h->fd < 0) {
fprintf(stderr, "Cannot open %s: %s\n", fn, strerror(errno));
return;
}
h->e = elf_begin(h->fd, elfmode, NULL);
if (!h->e) {
fprintf(stderr, "elf_begin() failed on %s: %s\n", fn, elf_errmsg(-1));
goto ERR;
}
if (elfmode == ELF_C_READ || elfmode == ELF_C_RDWR) {
if (elf_kind(h->e) != ELF_K_ELF) {
fprintf(stderr, "Not an ELF object: %s", fn);
goto ERR;
}
}
return;
ERR:
if (h->e) {
elf_end(h->e);
h->e = NULL;
}
close(h->fd);
}
void closeElf(ELFHandles *h)
{
if (h->e) {
elf_end(h->e);
close(h->fd);
h->e = NULL;
}
}
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