epan/dissectors/packet-smb-common.c

   1 /* packet-smb-common.c
   2  * Common routines for smb packet dissection
   3  * Copyright 2000, Jeffrey C. Foster <jfoste@woodward.com>
   4  *
   5  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * Copied from packet-pop.c
  10  *
  11  * SPDX-License-Identifier: GPL-2.0-or-later
  12  */
  13
  14 #include "config.h"
  15
  16 #include <epan/packet.h>
  17 #include <epan/strutil.h>
  18 #include "packet-smb-common.h"
  19
  20 #include "packet-dns.h"
  21
  22 /*
  23  * Share type values - used in LANMAN and in SRVSVC.
  24  *
  25  * XXX - should we dissect share type values, at least in SRVSVC, as
  26  * a subtree with bitfields, as the 0x80000000 bit appears to be a
  27  * hidden bit, with some number of bits at the bottom being the share
  28  * type?
  29  *
  30  * Does LANMAN use that bit?
  31  */
  32 const value_string share_type_vals[] = {
  33         {0, "Directory tree"},
  34         {1, "Printer queue"},
  35         {2, "Communications device"},
  36         {3, "IPC"},
  37         {0x80000000, "Hidden Directory tree"},
  38         {0x80000001, "Hidden Printer queue"},
  39         {0x80000002, "Hidden Communications device"},
  40         {0x80000003, "Hidden IPC"},
  41         {0, NULL}
  42 };
  43
  44 int display_ms_string(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, int hf_index, char **data)
  45 {
  46         char *str;
  47         int   len;
  48
  49         /* display a string from the tree and return the new offset */
  50
  51         str = tvb_get_stringz_enc(pinfo->pool, tvb, offset, &len, ENC_ASCII);
  52         proto_tree_add_string(tree, hf_index, tvb, offset, len, str);
  53
  54         /* Return a copy of the string if requested */
  55
  56         if (data)
  57                 *data = str;
  58
  59         return  offset+len;
  60 }
  61
  62
  63 int display_unicode_string(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, int hf_index, char **data)
  64 {
  65         char    *str;
  66         int      len;
  67
  68         /* display a unicode string from the tree and return new offset */
  69
  70         str = tvb_get_stringz_enc(pinfo->pool, tvb, offset, &len, ENC_UTF_16|ENC_LITTLE_ENDIAN);
  71         proto_tree_add_string(tree, hf_index, tvb, offset, len, str);
  72
  73         /* Return a copy of the string if requested */
  74
  75         if (data)
  76                 *data = str;
  77
  78         return  offset+len;
  79 }
  80
  81 /* Max string length for displaying Unicode strings.  */
  82 #define MAX_UNICODE_STR_LEN     256
  83
  84 int dissect_ms_compressed_string(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, int hf_index,
  85                                  const char **data)
  86 {
  87         int           compr_len;
  88         int          str_len;
  89         const char   *str = NULL;
  90
  91         /* The name data MUST start at offset 0 of the tvb */
  92         compr_len = get_dns_name(tvb, offset, MAX_UNICODE_STR_LEN+3+1, 0, &str, &str_len);
  93         proto_tree_add_string(tree, hf_index, tvb, offset, compr_len, format_text(pinfo->pool, str, str_len));
  94
  95         if (data)
  96                 *data = str;
  97
  98         return offset + compr_len;
  99 }
 100
 101 /*
 102  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 103  *
 104  * Local variables:
 105  * c-basic-offset: 8
 106  * tab-width: 8
 107  * indent-tabs-mode: t
 108  * End:
 109  *
 110  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
 111  * :indentSize=8:tabSize=8:noTabs=false:
 112  */