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 1.3 2000/01/07 22:05:42 guy 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
  93 static void dissect_whoent(const u_char *pd, int offset, frame_data *fd, proto_tree *tree);
  94
  95 void
  96 dissect_who(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
  97 {
  98
  99         proto_tree      *who_tree = NULL;
 100         proto_item      *who_ti = NULL;
 101         gchar           server_name[33];
 102         double          loadav_5 = 0.0, loadav_10 = 0.0, loadav_15 = 0.0;
 103
 104         /* Summary information */
 105         if (check_col(fd, COL_PROTOCOL))
 106                 col_add_str(fd, COL_PROTOCOL, "WHO");
 107
 108         /* Figure out if we have enough bytes in the packet
 109          * to retrieve the data that we want to put into the summary
 110          * line: hostname and load average
 111          */
 112         if ( BYTES_ARE_IN_FRAME(offset, 60) ) {
 113
 114                 memcpy(server_name, &pd[offset + 12], 32);
 115                 server_name[32] = '\0';
 116
 117                 loadav_5  = (double) pntohl(&pd[offset+44]) / 100.0;
 118                 loadav_10 = (double) pntohl(&pd[offset+48]) / 100.0;
 119                 loadav_15 = (double) pntohl(&pd[offset+52]) / 100.0;
 120
 121                 /* Summary information */
 122                 if (check_col(fd, COL_INFO))
 123                         col_add_fstr(fd, COL_INFO, "%s: %.02f %.02f %.02f",
 124                                         server_name, loadav_5, loadav_10, loadav_15);
 125         }
 126         else {
 127                 return;
 128         }
 129
 130
 131         if (tree) {
 132                 struct timeval tv;
 133
 134                 tv.tv_usec = 0;
 135
 136                 /* We already know that the packet has enough data to fill in
 137                  * the summary info. Retrieve that data */
 138
 139                 who_ti = proto_tree_add_item(tree, proto_who, offset, END_OF_FRAME, NULL);
 140                 who_tree = proto_item_add_subtree(who_ti, ett_who);
 141
 142                 proto_tree_add_item(who_tree, hf_who_vers, offset, 1, pd[offset]);
 143                 offset += 1;
 144
 145
 146                 proto_tree_add_item(who_tree, hf_who_type, offset, 1, pd[offset]);
 147                 offset += 1;
 148
 149                 /* 2 filler bytes */
 150                 offset += 2;
 151
 152                 tv.tv_sec = pntohl(&pd[offset]);
 153                 proto_tree_add_item(who_tree, hf_who_sendtime, offset, 4, &tv);
 154                 offset += 4;
 155
 156                 tv.tv_sec = pntohl(&pd[offset]);
 157                 proto_tree_add_item(who_tree, hf_who_recvtime, offset, 4, &tv);
 158                 offset += 4;
 159
 160                 proto_tree_add_item(who_tree, hf_who_hostname, offset, 32, server_name);
 161                 offset += 32;
 162
 163                 proto_tree_add_item(who_tree, hf_who_loadav_5, offset, 4, loadav_5);
 164                 offset += 4;
 165
 166                 proto_tree_add_item(who_tree, hf_who_loadav_10, offset, 4, loadav_10);
 167                 offset += 4;
 168
 169                 proto_tree_add_item(who_tree, hf_who_loadav_15, offset, 4, loadav_15);
 170                 offset += 4;
 171
 172                 tv.tv_sec = pntohl(&pd[offset]);
 173                 proto_tree_add_item(who_tree, hf_who_boottime, offset, 4, &tv);
 174                 offset += 4;
 175
 176                 dissect_whoent(pd, offset, fd, who_tree);
 177         }
 178 }
 179
 180 /* The man page says that (1024 / sizeof(struct whoent)) is the maximum number
 181  * of whoent structures in the packet. */
 182 #define SIZE_OF_WHOENT  24
 183 #define MAX_NUM_WHOENTS (1024 / SIZE_OF_WHOENT)
 184
 185 static void
 186 dissect_whoent(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
 187 {
 188         proto_tree      *whoent_tree = NULL;
 189         proto_item      *whoent_ti = NULL;
 190         int             line_offset = offset;
 191         gchar           out_line[9];
 192         gchar           out_name[9];
 193         struct timeval  tv;
 194         int             whoent_num = 0;
 195         guint32         idle_secs; /* say that out loud... */
 196
 197         tv.tv_usec = 0;
 198         out_line[8] = '\0';
 199         out_name[8] = '\0';
 200
 201         while (BYTES_ARE_IN_FRAME(line_offset, SIZE_OF_WHOENT) && whoent_num < MAX_NUM_WHOENTS) {
 202                 memcpy(out_line, &pd[line_offset], 8);
 203                 memcpy(out_name, &pd[line_offset+8], 8);
 204
 205                 whoent_ti = proto_tree_add_item(tree, hf_who_whoent, line_offset, SIZE_OF_WHOENT, NULL);
 206                 whoent_tree = proto_item_add_subtree(whoent_ti, ett_whoent);
 207
 208                 proto_tree_add_item(whoent_tree, hf_who_tty, line_offset, 8, out_line);
 209                 line_offset += 8;
 210
 211                 proto_tree_add_item(whoent_tree, hf_who_uid, line_offset, 8, out_name);
 212                 line_offset += 8;
 213
 214                 tv.tv_sec = pntohl(&pd[line_offset]);
 215                 proto_tree_add_item(whoent_tree, hf_who_timeon, line_offset, 4, &tv);
 216                 line_offset += 4;
 217
 218                 idle_secs = pntohl(&pd[line_offset]);
 219                 proto_tree_add_item_format(whoent_tree, hf_who_idle, line_offset, 4, idle_secs,
 220                                 "Idle: %s", time_secs_to_str(idle_secs));
 221                 line_offset += 4;
 222
 223                 whoent_num++;
 224         }
 225 }
 226
 227 void
 228 proto_register_who(void)
 229 {
 230         static hf_register_info hf[] = {
 231                 { &hf_who_vers,
 232                 { "Version",    "who.vers", FT_UINT8, BASE_DEC, NULL, 0x0,
 233                         "" }},
 234
 235                 { &hf_who_type,
 236                 { "Type",       "who.type", FT_UINT8, BASE_DEC, NULL, 0x0,
 237                         "" }},
 238
 239                 { &hf_who_sendtime,
 240                 { "Send Time",  "who.sendtime", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0,
 241                         "" }},
 242
 243                 { &hf_who_recvtime,
 244                 { "Receive Time", "who.recvtime", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0,
 245                         "" }},
 246
 247                 { &hf_who_hostname,
 248                 { "Hostname", "who.hostname", FT_STRING, BASE_NONE, NULL, 0x0,
 249                         "" }},
 250
 251                 { &hf_who_loadav_5,
 252                 { "Load Average Over Past  5 Minutes", "who.loadav_5", FT_DOUBLE, BASE_NONE, NULL, 0x0,
 253                         "" }},
 254
 255                 { &hf_who_loadav_10,
 256                 { "Load Average Over Past 10 Minutes", "who.loadav_10", FT_DOUBLE, BASE_NONE, NULL, 0x0,
 257                         "" }},
 258
 259                 { &hf_who_loadav_15,
 260                 { "Load Average Over Past 15 Minutes", "who.loadav_15", FT_DOUBLE, BASE_NONE, NULL, 0x0,
 261                         "" }},
 262
 263                 { &hf_who_boottime,
 264                 { "Boot Time", "who.boottime", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0,
 265                         "" }},
 266
 267                 { &hf_who_whoent,
 268                 { "Who utmp Entry", "who.whoent", FT_NONE, BASE_NONE, NULL, 0x0,
 269                         "" }},
 270
 271                 { &hf_who_tty,
 272                 { "TTY Name", "who.tty", FT_STRING, BASE_NONE, NULL, 0x0,
 273                         "" }},
 274
 275                 { &hf_who_uid,
 276                 { "User ID", "who.uid", FT_STRING, BASE_NONE, NULL, 0x0,
 277                         "" }},
 278
 279                 { &hf_who_timeon,
 280                 { "Time On", "who.timeon", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0,
 281                         "" }},
 282
 283                 { &hf_who_idle,
 284                 { "Time Idle", "who.idle", FT_UINT32, BASE_NONE, NULL, 0x0,
 285                         "" }},
 286         };
 287
 288         static gint *ett[] = {
 289                 &ett_who,
 290                 &ett_whoent,
 291         };
 292
 293         proto_who = proto_register_protocol("Who", "who");
 294         proto_register_field_array(proto_who, hf, array_length(hf));
 295         proto_register_subtree_array(ett, array_length(ett));
 296 }
 297