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/* packet-who.c
* Routines for who protocol (see man rwhod)
* Gilbert Ramirez <gram@alumni.rice.edu>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/to_str.h>
/*
*
RWHOD(8) UNIX System Manager's Manual RWHOD(8)
The messages sent and received, are of the form:
struct outmp {
0 char out_line[8]; tty name
8 char out_name[8]; user id
16 long out_time; time on
};
struct whod {
0 char wd_vers;
1 char wd_type;
2 char wd_fill[2];
4 int wd_sendtime;
8 int wd_recvtime;
12 char wd_hostname[32];
44 int wd_loadav[3];
56 int wd_boottime;
60 struct whoent {
struct outmp we_utmp;
(20 each) int we_idle;
} wd_we[1024 / sizeof (struct whoent)];
};
*
*/
void proto_register_who(void);
void proto_reg_handoff_who(void);
static dissector_handle_t who_handle;
static int proto_who = -1;
static int hf_who_vers = -1;
static int hf_who_type = -1;
static int hf_who_sendtime = -1;
static int hf_who_recvtime = -1;
static int hf_who_hostname = -1;
static int hf_who_loadav_5 = -1;
static int hf_who_loadav_10 = -1;
static int hf_who_loadav_15 = -1;
static int hf_who_boottime = -1;
static int hf_who_whoent = -1;
static int hf_who_tty = -1;
static int hf_who_uid = -1;
static int hf_who_timeon = -1;
static int hf_who_idle = -1;
static gint ett_who = -1;
static gint ett_whoent = -1;
#define UDP_PORT_WHO 513
static void dissect_whoent(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree);
static int
dissect_who(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
int offset = 0;
proto_tree *who_tree;
proto_item *who_ti;
guint8 *server_name;
double loadav_5 = 0.0, loadav_10 = 0.0, loadav_15 = 0.0;
/* Summary information */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "WHO");
col_clear(pinfo->cinfo, COL_INFO);
who_ti = proto_tree_add_item(tree, proto_who, tvb, offset, -1, ENC_NA);
who_tree = proto_item_add_subtree(who_ti, ett_who);
proto_tree_add_item(who_tree, hf_who_vers, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(who_tree, hf_who_type, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* 2 filler bytes */
offset += 2;
if (tree) {
proto_tree_add_item(who_tree, hf_who_sendtime, tvb, offset, 4,
ENC_TIME_SECS|ENC_BIG_ENDIAN);
}
offset += 4;
if (tree) {
proto_tree_add_item(who_tree, hf_who_recvtime, tvb, offset, 4,
ENC_TIME_SECS|ENC_BIG_ENDIAN);
}
offset += 4;
server_name = tvb_get_stringzpad(pinfo->pool, tvb, offset, 32, ENC_ASCII|ENC_NA);
proto_tree_add_string(who_tree, hf_who_hostname, tvb, offset, 32, server_name);
offset += 32;
loadav_5 = tvb_get_ntohl(tvb, offset) / 100.0;
proto_tree_add_double(who_tree, hf_who_loadav_5, tvb, offset,
4, loadav_5);
offset += 4;
loadav_10 = tvb_get_ntohl(tvb, offset) / 100.0;
proto_tree_add_double(who_tree, hf_who_loadav_10, tvb, offset,
4, loadav_10);
offset += 4;
loadav_15 = tvb_get_ntohl(tvb, offset) / 100.0;
proto_tree_add_double(who_tree, hf_who_loadav_15, tvb, offset,
4, loadav_15);
offset += 4;
/* Summary information */
col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %.02f %.02f %.02f",
server_name, loadav_5, loadav_10, loadav_15);
if (tree) {
proto_tree_add_item(who_tree, hf_who_boottime, tvb, offset, 4,
ENC_TIME_SECS|ENC_BIG_ENDIAN);
offset += 4;
dissect_whoent(pinfo, tvb, offset, who_tree);
}
return tvb_captured_length(tvb);
}
/* The man page says that (1024 / sizeof(struct whoent)) is the maximum number
* of whoent structures in the packet. */
#define SIZE_OF_WHOENT 24
#define MAX_NUM_WHOENTS (1024 / SIZE_OF_WHOENT)
static void
dissect_whoent(packet_info *pinfo, tvbuff_t *tvb, int offset, proto_tree *tree)
{
proto_tree *whoent_tree = NULL;
proto_item *whoent_ti = NULL;
int line_offset = offset;
guint8 *out_line;
guint8 *out_name;
int whoent_num = 0;
guint32 idle_secs; /* say that out loud... */
while (tvb_reported_length_remaining(tvb, line_offset) > 0
&& whoent_num < MAX_NUM_WHOENTS) {
whoent_ti = proto_tree_add_item(tree, hf_who_whoent, tvb,
line_offset, SIZE_OF_WHOENT, ENC_NA);
whoent_tree = proto_item_add_subtree(whoent_ti, ett_whoent);
out_line = tvb_get_stringzpad(pinfo->pool, tvb, line_offset, 8, ENC_ASCII|ENC_NA);
proto_tree_add_string(whoent_tree, hf_who_tty, tvb, line_offset,
8, out_line);
line_offset += 8;
out_name = tvb_get_stringzpad(pinfo->pool, tvb, line_offset, 8, ENC_ASCII|ENC_NA);
proto_tree_add_string(whoent_tree, hf_who_uid, tvb, line_offset,
8, out_name);
line_offset += 8;
proto_tree_add_item(whoent_tree, hf_who_timeon, tvb,
line_offset, 4, ENC_TIME_SECS|ENC_BIG_ENDIAN);
line_offset += 4;
idle_secs = tvb_get_ntohl(tvb, line_offset);
proto_tree_add_uint_format(whoent_tree, hf_who_idle, tvb,
line_offset, 4, idle_secs, "Idle: %s",
signed_time_secs_to_str(pinfo->pool, idle_secs));
line_offset += 4;
whoent_num++;
}
}
void
proto_register_who(void)
{
static hf_register_info hf[] = {
{ &hf_who_vers,
{ "Version", "who.vers", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_who_type,
{ "Type", "who.type", FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_who_sendtime,
{ "Send Time", "who.sendtime", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0,
NULL, HFILL }},
{ &hf_who_recvtime,
{ "Receive Time", "who.recvtime", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0,
NULL, HFILL }},
{ &hf_who_hostname,
{ "Hostname", "who.hostname", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_who_loadav_5,
{ "Load Average Over Past 5 Minutes", "who.loadav_5", FT_DOUBLE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_who_loadav_10,
{ "Load Average Over Past 10 Minutes", "who.loadav_10", FT_DOUBLE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_who_loadav_15,
{ "Load Average Over Past 15 Minutes", "who.loadav_15", FT_DOUBLE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_who_boottime,
{ "Boot Time", "who.boottime", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0,
NULL, HFILL }},
{ &hf_who_whoent,
{ "Who utmp Entry", "who.entry", FT_NONE, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_who_tty,
{ "TTY Name", "who.tty", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_who_uid,
{ "User ID", "who.uid", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_who_timeon,
{ "Time On", "who.timeon", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x0,
NULL, HFILL }},
{ &hf_who_idle,
{ "Time Idle", "who.idle", FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
};
static gint *ett[] = {
&ett_who,
&ett_whoent,
};
proto_who = proto_register_protocol("Who", "WHO", "who");
who_handle = register_dissector("who", dissect_who, proto_who);
proto_register_field_array(proto_who, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_who(void)
{
dissector_add_uint_with_preference("udp.port", UDP_PORT_WHO, who_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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