1 /* 2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk (at) cs.few.eur.nl> 3 * Copyright (c) 1993 Branko Lankester <branko (at) hacktic.nl> 4 * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs (at) world.std.com> 5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert (at) cistron.nl> 6 * Copyright (c) 2005-2015 Dmitry V. Levin <ldv (at) altlinux.org> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include "defs.h" 33 #include <dirent.h> 34 35 #include "xlat/dirent_types.h" 36 37 #define D_NAME_LEN_MAX 256 38 39 SYS_FUNC(getdents64) 40 { 41 /* the minimum size of a valid dirent64 structure */ 42 const unsigned int d_name_offset = offsetof(struct dirent64, d_name); 43 44 unsigned int i, len, dents = 0; 45 char *buf; 46 47 if (entering(tcp)) { 48 printfd(tcp, tcp->u_arg[0]); 49 tprints(", "); 50 return 0; 51 } 52 53 const unsigned int count = tcp->u_arg[2]; 54 55 if (syserror(tcp) || !verbose(tcp)) { 56 printaddr(tcp->u_arg[1]); 57 tprintf(", %u", count); 58 return 0; 59 } 60 61 /* Beware of insanely large or too small values in tcp->u_rval */ 62 if (tcp->u_rval > 1024*1024) 63 len = 1024*1024; 64 else if (tcp->u_rval < (int) d_name_offset) 65 len = 0; 66 else 67 len = tcp->u_rval; 68 69 if (len) { 70 buf = malloc(len); 71 if (!buf || umoven(tcp, tcp->u_arg[1], len, buf) < 0) { 72 printaddr(tcp->u_arg[1]); 73 tprintf(", %u", count); 74 free(buf); 75 return 0; 76 } 77 } else { 78 buf = NULL; 79 } 80 81 if (!abbrev(tcp)) 82 tprints("["); 83 for (i = 0; len && i <= len - d_name_offset; ) { 84 struct dirent64 *d = (struct dirent64 *) &buf[i]; 85 if (!abbrev(tcp)) { 86 int d_name_len; 87 if (d->d_reclen >= d_name_offset 88 && i + d->d_reclen <= len) { 89 d_name_len = d->d_reclen - d_name_offset; 90 } else { 91 d_name_len = len - i - d_name_offset; 92 } 93 if (d_name_len > D_NAME_LEN_MAX) 94 d_name_len = D_NAME_LEN_MAX; 95 96 tprintf("%s{d_ino=%" PRIu64 ", d_off=%" PRId64 97 ", d_reclen=%u, d_type=", 98 i ? ", " : "", 99 d->d_ino, 100 d->d_off, 101 d->d_reclen); 102 printxval(dirent_types, d->d_type, "DT_???"); 103 104 tprints(", d_name="); 105 if (print_quoted_string(d->d_name, d_name_len, 106 QUOTE_0_TERMINATED) > 0) { 107 tprints("..."); 108 } 109 110 tprints("}"); 111 } 112 if (d->d_reclen < d_name_offset) { 113 tprints("/* d_reclen < offsetof(struct dirent64, d_name) */"); 114 break; 115 } 116 i += d->d_reclen; 117 dents++; 118 } 119 if (!abbrev(tcp)) 120 tprints("]"); 121 else 122 tprintf("/* %u entries */", dents); 123 tprintf(", %u", count); 124 free(buf); 125 return 0; 126 } 127
