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/* $OpenBSD: elf2olf.c,v 1.7 2003/06/10 22:20:46 deraadt Exp $ */
/*
* Copyright (c) 1996 Erik Theisen. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1996 Erik Theisen. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char rcsid[] = "@(#) $Id: elf2olf.c,v 1.7 2003/06/10 22:20:46 deraadt Exp $";
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <olf_abi.h>
int retval = 0;
int olf2elf;
char *progname;
int verbose;
int opsys = OS_ID;
char *os_namev[] = ONAMEV;
/* Handle endianess */
#define word(x,y)((y == ELFDATA2LSB) ? ntohl(htonl(x)) : ntohl(x))
#define half(x,y)((y == ELFDATA2LSB) ? ntohs(htons(x)) : ntohs(x))
void usage(void);
void pwarn(char *, char *, int);
int
main(int argc, char*argv[])
{
extern char *optarg;
extern int optind;
int ch, i, okay;
char *opstring;
int fd;
struct stat st;
Elf32_Ehdr ehdr;
Elf32_Shdr shdr;
int e;
if ((progname = strrchr(*argv, '/')))
++progname;
else
progname = *argv;
if (strstr(progname, "olf2elf"))
olf2elf = 1;
/*
* Process cmdline
*/
opstring = olf2elf ? "v" : "vo:";
while((ch = getopt(argc, argv, opstring)) != -1)
switch(ch) {
case 'v':
verbose = 1;
break;
case 'o':
for (i = 1; i <= OOS_NUM; i++) {
if (os_namev[i] == NULL) {
fprintf(stderr,
"%s: illegal -o argument -- %s\n",
progname, optarg);
usage();
}
else if (strcmp(optarg, os_namev[i]) == 0) {
opsys = i;
break;
}
}
break;
default:
usage();
}
argc -= optind;
argv += optind;
if (argc == 0)
usage();
/*
* Process file(s)
*/
do {
okay = 0;
if ((fd = open(*argv, O_RDWR | O_EXLOCK, 0)) > 0 &&
lseek(fd, (off_t)0, SEEK_SET) == 0 &&
fstat(fd, &st) == 0) {
/* Make sure this is a 32bit ELF or OLF version 1 file */
if (read(fd, &ehdr, sizeof(Elf32_Ehdr)) == sizeof(Elf32_Ehdr)&&
(IS_ELF(ehdr) || IS_OLF(ehdr)) &&
ehdr.e_ident[EI_CLASS] == ELFCLASS32 &&
ehdr.e_ident[EI_VERSION] == 1) {
/* Is this elf2olf? */
if(!olf2elf) {
/* Tag, your it... */
ehdr.e_ident[OI_MAG0] = OLFMAG0;
ehdr.e_ident[OI_MAG1] = OLFMAG1;
ehdr.e_ident[OI_MAG2] = OLFMAG2;
ehdr.e_ident[OI_MAG3] = OLFMAG3;
ehdr.e_ident[OI_OS] = opsys;
ehdr.e_ident[OI_DYNAMIC] = ODYNAMIC_N;
ehdr.e_ident[OI_STRIP] = OSTRIP;
/* We'll need this endian */
e = ehdr.e_ident[EI_DATA];
/* Now we need to figure out wether or */
/* not we're really stripped. */
if (lseek(fd, (off_t)word(ehdr.e_shoff, e),
SEEK_SET) == word(ehdr.e_shoff, e)) {
/*
* search through section header table
* looking for a section header of type
* SHT_SYMTAB and SHT_DYNAMIC. If there is
* one present we're NOT stripped and/or
* dynamic.
*/
for (i = 0; i < half(ehdr.e_shnum, e); i++) {
if (read(fd, &shdr, sizeof(Elf32_Shdr)) == sizeof(Elf32_Shdr)){
if (word(shdr.sh_type, e) == SHT_SYMTAB)
ehdr.e_ident[OI_STRIP] = OSTRIP_N;
else if (word(shdr.sh_type, e) == SHT_DYNAMIC)
ehdr.e_ident[OI_DYNAMIC] = ODYNAMIC;
} else
pwarn(progname, *argv, errno);
} /* while less than number of section headers */
/* We're ready to modify */
okay = 1;
} else /* Bogus section header table seek */
pwarn(progname, *argv, errno);
} else { /* olf2elf */
ehdr.e_ident[EI_MAG0] = ELFMAG0;
ehdr.e_ident[EI_MAG1] = ELFMAG1;
ehdr.e_ident[EI_MAG2] = ELFMAG2;
ehdr.e_ident[EI_MAG3] = ELFMAG3;
ehdr.e_ident[OI_OS] = 0;
ehdr.e_ident[OI_DYNAMIC] = 0;
ehdr.e_ident[OI_STRIP] = 0;
okay = 1;
} /* olf2elf */
} else /* Bogus non-ELF file encountered */
pwarn(progname, *argv, ENOEXEC);
/*
* Do It.
*/
if (okay) {
if (lseek(fd, (off_t)0, SEEK_SET) == 0) {
if (write(fd, &ehdr, sizeof(Elf32_Ehdr)) == sizeof(Elf32_Ehdr)) {
if (verbose) {
if (!olf2elf) {
printf("ELF %s => OLF %d-bit %s %s linked %s OLF.\n",
*argv,
(ehdr.e_ident[OI_CLASS] == OLFCLASS32)?\
32 : 64,
os_namev[ehdr.e_ident[OI_OS]],
ehdr.e_ident[OI_DYNAMIC] ? \
"dynamically" : "statically",
!ehdr.e_ident[OI_STRIP] ?
"stripped" : "unstripped");
} else
printf("OLF %s => ELF.\n", *argv);
}
} else /* bad write */
pwarn(progname, *argv, errno);
} else /* bad seek */
pwarn(progname, *argv, errno);
} /* okay? */
fsync(fd);
close(fd);
} else /* couldn't handle file */
pwarn(progname, *argv, errno);
} while (*(++argv) != NULL);
return (retval);
}
void
pwarn(name, fname, errval)
char *name;
char *fname;
int errval;
{
fprintf(stderr, "%s: %s: %s.\n", name, fname, strerror(errval));
retval = 1;
}
void
usage(void)
{
int i;
int col = 8;
if (olf2elf) {
fprintf(stderr, "usage: %s [-v] file ...\n", progname);
} else {
fprintf(stderr, "usage: %s [-v] [-o opsys] elffile ...\n", progname);
fprintf(stderr, "where opsys is:\n\t");
for (i = 1; os_namev[i] != NULL; i++) {
col = col + strlen(os_namev[i]) + 2;
if (col > 78) {
fprintf(stderr, "\n\t");
col = 8;
}
fprintf(stderr, "%s%s", os_namev[i],
os_namev[i+1] ? ", " : "\n");
}
}
exit(1);
}
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