packet-who.c

   1 /* packet-who.c
   2  * Routines for who protocol (see man rwhod)
   3  * Gilbert Ramirez <gram@xiexie.org>
   4  *
   5  * $Id: packet-who.c,v 1.9 2000/08/13 14:09:09 deniel Exp $
   6  *
   7  * Ethereal - Network traffic analyzer
   8  * By Gerald Combs <gerald@zing.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  25  */
  26
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #ifdef HAVE_SYS_TYPES_H
  32 # include <sys/types.h>
  33 #endif
  34
  35 #include <time.h>
  36 #include <glib.h>
  37 #include "packet.h"
  38
  39
  40 /*
  41  *
  42 RWHOD(8)                 UNIX System Manager's Manual                 RWHOD(8)
  43
  44
  45      The messages sent and received, are of the form:
  46
  47            struct  outmp {
  48 0                   char    out_line[8];             tty name
  49 8                   char    out_name[8];             user id
  50 16                   long    out_time;               time on
  51            };
  52
  53            struct  whod {
  54  0                   char    wd_vers;
  55  1                   char    wd_type;
  56  2                   char    wd_fill[2];
  57  4                   int     wd_sendtime;
  58  8                   int     wd_recvtime;
  59 12                   char    wd_hostname[32];
  60 44                   int     wd_loadav[3];
  61 56                   int     wd_boottime;
  62 60                   struct  whoent {
  63                            struct  outmp we_utmp;
  64 (20 each)                  int     we_idle;
  65                    } wd_we[1024 / sizeof (struct whoent)];
  66            };
  67
  68  Linux 2.0                       May 13, 1997                                2
  69
  70  *
  71  */
  72
  73 static int proto_who = -1;
  74 static int hf_who_vers = -1;
  75 static int hf_who_type = -1;
  76 static int hf_who_sendtime = -1;
  77 static int hf_who_recvtime = -1;
  78 static int hf_who_hostname = -1;
  79 static int hf_who_loadav_5 = -1;
  80 static int hf_who_loadav_10 = -1;
  81 static int hf_who_loadav_15 = -1;
  82 static int hf_who_boottime = -1;
  83 static int hf_who_whoent = -1;
  84 static int hf_who_tty = -1;
  85 static int hf_who_uid = -1;
  86 static int hf_who_timeon = -1;
  87 static int hf_who_idle = -1;
  88
  89 static gint ett_who = -1;
  90 static gint ett_whoent = -1;
  91
  92 #define UDP_PORT_WHO    513
  93
  94 static void dissect_whoent(const u_char *pd, int offset, frame_data *fd, proto_tree *tree);
  95
  96 static void
  97 dissect_who(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
  98 {
  99
 100         proto_tree      *who_tree = NULL;
 101         proto_item      *who_ti = NULL;
 102         gchar           server_name[33];
 103         double          loadav_5 = 0.0, loadav_10 = 0.0, loadav_15 = 0.0;
 104
 105         OLD_CHECK_DISPLAY_AS_DATA(proto_who, pd, offset, fd, tree);
 106
 107         /* Summary information */
 108         if (check_col(fd, COL_PROTOCOL))
 109                 col_add_str(fd, COL_PROTOCOL, "WHO");
 110
 111         /* Figure out if we have enough bytes in the packet
 112          * to retrieve the data that we want to put into the summary
 113          * line: hostname and load average
 114          */
 115         if ( BYTES_ARE_IN_FRAME(offset, 60) ) {
 116
 117                 memcpy(server_name, &pd[offset + 12], 32);
 118                 server_name[32] = '\0';
 119
 120                 loadav_5  = (double) pntohl(&pd[offset+44]) / 100.0;
 121                 loadav_10 = (double) pntohl(&pd[offset+48]) / 100.0;
 122                 loadav_15 = (double) pntohl(&pd[offset+52]) / 100.0;
 123
 124                 /* Summary information */
 125                 if (check_col(fd, COL_INFO))
 126                         col_add_fstr(fd, COL_INFO, "%s: %.02f %.02f %.02f",
 127                                         server_name, loadav_5, loadav_10, loadav_15);
 128         }
 129         else {
 130                 return;
 131         }
 132
 133
 134         if (tree) {
 135                 struct timeval tv;
 136
 137                 tv.tv_usec = 0;
 138
 139                 /* We already know that the packet has enough data to fill in
 140                  * the summary info. Retrieve that data */
 141
 142                 who_ti = proto_tree_add_item(tree, proto_who, NullTVB, offset, END_OF_FRAME, FALSE);
 143                 who_tree = proto_item_add_subtree(who_ti, ett_who);
 144
 145                 proto_tree_add_uint(who_tree, hf_who_vers, NullTVB, offset, 1, pd[offset]);
 146                 offset += 1;
 147
 148
 149                 proto_tree_add_uint(who_tree, hf_who_type, NullTVB, offset, 1, pd[offset]);
 150                 offset += 1;
 151
 152                 /* 2 filler bytes */
 153                 offset += 2;
 154
 155                 tv.tv_sec = pntohl(&pd[offset]);
 156                 proto_tree_add_time(who_tree, hf_who_sendtime, NullTVB, offset, 4, &tv);
 157                 offset += 4;
 158
 159                 tv.tv_sec = pntohl(&pd[offset]);
 160                 proto_tree_add_time(who_tree, hf_who_recvtime, NullTVB, offset, 4, &tv);
 161                 offset += 4;
 162
 163                 proto_tree_add_string(who_tree, hf_who_hostname, NullTVB, offset, 32, server_name);
 164                 offset += 32;
 165
 166                 proto_tree_add_double(who_tree, hf_who_loadav_5, NullTVB, offset, 4, loadav_5);
 167                 offset += 4;
 168
 169                 proto_tree_add_double(who_tree, hf_who_loadav_10, NullTVB, offset, 4, loadav_10);
 170                 offset += 4;
 171
 172                 proto_tree_add_double(who_tree, hf_who_loadav_15, NullTVB, offset, 4, loadav_15);
 173                 offset += 4;
 174
 175                 tv.tv_sec = pntohl(&pd[offset]);
 176                 proto_tree_add_time(who_tree, hf_who_boottime, NullTVB, offset, 4, &tv);
 177                 offset += 4;
 178
 179                 dissect_whoent(pd, offset, fd, who_tree);
 180         }
 181 }
 182
 183 /* The man page says that (1024 / sizeof(struct whoent)) is the maximum number
 184  * of whoent structures in the packet. */
 185 #define SIZE_OF_WHOENT  24
 186 #define MAX_NUM_WHOENTS (1024 / SIZE_OF_WHOENT)
 187
 188 static void
 189 dissect_whoent(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
 190 {
 191         proto_tree      *whoent_tree = NULL;
 192         proto_item      *whoent_ti = NULL;
 193         int             line_offset = offset;
 194         gchar           out_line[9];
 195         gchar           out_name[9];
 196         struct timeval  tv;
 197         int             whoent_num = 0;
 198         guint32         idle_secs; /* say that out loud... */
 199
 200         tv.tv_usec = 0;
 201         out_line[8] = '\0';
 202         out_name[8] = '\0';
 203
 204         while (BYTES_ARE_IN_FRAME(line_offset, SIZE_OF_WHOENT) && whoent_num < MAX_NUM_WHOENTS) {
 205                 memcpy(out_line, &pd[line_offset], 8);
 206                 memcpy(out_name, &pd[line_offset+8], 8);
 207
 208                 whoent_ti = proto_tree_add_item(tree, hf_who_whoent, NullTVB, line_offset, SIZE_OF_WHOENT, FALSE);
 209                 whoent_tree = proto_item_add_subtree(whoent_ti, ett_whoent);
 210
 211                 proto_tree_add_string(whoent_tree, hf_who_tty, NullTVB, line_offset, 8, out_line);
 212                 line_offset += 8;
 213
 214                 proto_tree_add_string(whoent_tree, hf_who_uid, NullTVB, line_offset, 8, out_name);
 215                 line_offset += 8;
 216
 217                 tv.tv_sec = pntohl(&pd[line_offset]);
 218                 proto_tree_add_time(whoent_tree, hf_who_timeon, NullTVB, line_offset, 4, &tv);
 219                 line_offset += 4;
 220
 221                 idle_secs = pntohl(&pd[line_offset]);
 222                 proto_tree_add_uint_format(whoent_tree, hf_who_idle, NullTVB, line_offset, 4, idle_secs,
 223                                 "Idle: %s", time_secs_to_str(idle_secs));
 224                 line_offset += 4;
 225
 226                 whoent_num++;
 227         }
 228 }
 229
 230 void
 231 proto_register_who(void)
 232 {
 233         static hf_register_info hf[] = {
 234                 { &hf_who_vers,
 235                 { "Version",    "who.vers", FT_UINT8, BASE_DEC, NULL, 0x0,
 236                         "" }},
 237
 238                 { &hf_who_type,
 239                 { "Type",       "who.type", FT_UINT8, BASE_DEC, NULL, 0x0,
 240                         "" }},
 241
 242                 { &hf_who_sendtime,
 243                 { "Send Time",  "who.sendtime", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0,
 244                         "" }},
 245
 246                 { &hf_who_recvtime,
 247                 { "Receive Time", "who.recvtime", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0,
 248                         "" }},
 249
 250                 { &hf_who_hostname,
 251                 { "Hostname", "who.hostname", FT_STRING, BASE_NONE, NULL, 0x0,
 252                         "" }},
 253
 254                 { &hf_who_loadav_5,
 255                 { "Load Average Over Past  5 Minutes", "who.loadav_5", FT_DOUBLE, BASE_NONE, NULL, 0x0,
 256                         "" }},
 257
 258                 { &hf_who_loadav_10,
 259                 { "Load Average Over Past 10 Minutes", "who.loadav_10", FT_DOUBLE, BASE_NONE, NULL, 0x0,
 260                         "" }},
 261
 262                 { &hf_who_loadav_15,
 263                 { "Load Average Over Past 15 Minutes", "who.loadav_15", FT_DOUBLE, BASE_NONE, NULL, 0x0,
 264                         "" }},
 265
 266                 { &hf_who_boottime,
 267                 { "Boot Time", "who.boottime", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0,
 268                         "" }},
 269
 270                 { &hf_who_whoent,
 271                 { "Who utmp Entry", "who.whoent", FT_NONE, BASE_NONE, NULL, 0x0,
 272                         "" }},
 273
 274                 { &hf_who_tty,
 275                 { "TTY Name", "who.tty", FT_STRING, BASE_NONE, NULL, 0x0,
 276                         "" }},
 277
 278                 { &hf_who_uid,
 279                 { "User ID", "who.uid", FT_STRING, BASE_NONE, NULL, 0x0,
 280                         "" }},
 281
 282                 { &hf_who_timeon,
 283                 { "Time On", "who.timeon", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0,
 284                         "" }},
 285
 286                 { &hf_who_idle,
 287                 { "Time Idle", "who.idle", FT_UINT32, BASE_NONE, NULL, 0x0,
 288                         "" }},
 289         };
 290
 291         static gint *ett[] = {
 292                 &ett_who,
 293                 &ett_whoent,
 294         };
 295
 296         proto_who = proto_register_protocol("Who", "who");
 297         proto_register_field_array(proto_who, hf, array_length(hf));
 298         proto_register_subtree_array(ett, array_length(ett));
 299 }
 300
 301 void
 302 proto_reg_handoff_who(void)
 303 {
 304         old_dissector_add("udp.port", UDP_PORT_WHO, dissect_who);
 305 }