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/*
* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
* Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
* Copyright (c) 2005-2015 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2014-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include "kernel_dirent.h"
#include DEF_MPERS_TYPE(kernel_dirent_t)
#include MPERS_DEFS
#include "xgetdents.h"
#define D_NAME_LEN_MAX 256
/* The minimum size of a valid directory entry. */
static const unsigned int header_size =
offsetof(kernel_dirent_t, d_name);
static void
print_dentry_head(const kernel_dirent_t *const dent)
{
tprint_struct_begin();
PRINT_FIELD_U(*dent, d_ino);
tprint_struct_next();
PRINT_FIELD_U(*dent, d_off);
tprint_struct_next();
PRINT_FIELD_U(*dent, d_reclen);
}
static unsigned int
decode_dentry_head(struct tcb *const tcp, const void *const arg)
{
const kernel_dirent_t *const dent = arg;
if (!abbrev(tcp))
print_dentry_head(dent);
return dent->d_reclen;
}
static int
decode_dentry_tail(struct tcb *const tcp, kernel_ulong_t addr,
const void *const arg, const unsigned int d_name_type_len)
{
int rc = 0;
/* !abbrev(tcp) */
if (d_name_type_len) {
unsigned int d_name_len = d_name_type_len - 1;
if (d_name_len) {
if (d_name_len > D_NAME_LEN_MAX)
d_name_len = D_NAME_LEN_MAX;
tprint_struct_next();
tprints_field_name("d_name");
rc = printpathn(tcp, addr, d_name_len - 1);
}
tprint_struct_next();
tprints_field_name("d_type");
const kernel_ulong_t d_type_addr =
addr + (d_name_type_len - 1);
unsigned char d_type;
if (umove_or_printaddr(tcp, d_type_addr, &d_type))
rc = -1;
else
printxval(dirent_types, d_type, "DT_???");
}
tprint_struct_end();
return rc;
}
SYS_FUNC(getdents)
{
return xgetdents(tcp, header_size,
decode_dentry_head, decode_dentry_tail);
}
static void
print_old_dirent(struct tcb *const tcp, const kernel_ulong_t addr)
{
kernel_dirent_t dent;
if (umove_or_printaddr(tcp, addr, &dent))
return;
print_dentry_head(&dent);
tprint_struct_next();
tprints_field_name("d_name");
printpathn(tcp, addr + header_size,
MIN(dent.d_reclen, D_NAME_LEN_MAX));
tprint_struct_end();
}
SYS_FUNC(readdir)
{
if (entering(tcp)) {
/* fd */
printfd(tcp, tcp->u_arg[0]);
tprint_arg_next();
} else {
/* dirp */
if (tcp->u_rval == 0)
printaddr(tcp->u_arg[1]);
else
print_old_dirent(tcp, tcp->u_arg[1]);
/* count */
const unsigned int count = tcp->u_arg[2];
/* Not much point in printing this out, it is always 1. */
if (count != 1) {
tprint_arg_next();
PRINT_VAL_U(count);
}
}
return 0;
}
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