/* packet-who.c * Routines for who protocol (see man rwhod) * Gilbert Ramirez * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "config.h" #include #include /* * 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; static int hf_who_vers; static int hf_who_type; static int hf_who_sendtime; static int hf_who_recvtime; static int hf_who_hostname; static int hf_who_loadav_5; static int hf_who_loadav_10; static int hf_who_loadav_15; static int hf_who_boottime; static int hf_who_whoent; static int hf_who_tty; static int hf_who_uid; static int hf_who_timeon; static int hf_who_idle; static gint ett_who; static gint ett_whoent; #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: */