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 1.6 2000/05/11 08:15:56 gram 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         /* Summary information */
 106         if (check_col(fd, COL_PROTOCOL))
 107                 col_add_str(fd, COL_PROTOCOL, "WHO");
 108
 109         /* Figure out if we have enough bytes in the packet
 110          * to retrieve the data that we want to put into the summary
 111          * line: hostname and load average
 112          */
 113         if ( BYTES_ARE_IN_FRAME(offset, 60) ) {
 114
 115                 memcpy(server_name, &pd[offset + 12], 32);
 116                 server_name[32] = '\0';
 117
 118                 loadav_5  = (double) pntohl(&pd[offset+44]) / 100.0;
 119                 loadav_10 = (double) pntohl(&pd[offset+48]) / 100.0;
 120                 loadav_15 = (double) pntohl(&pd[offset+52]) / 100.0;
 121
 122                 /* Summary information */
 123                 if (check_col(fd, COL_INFO))
 124                         col_add_fstr(fd, COL_INFO, "%s: %.02f %.02f %.02f",
 125                                         server_name, loadav_5, loadav_10, loadav_15);
 126         }
 127         else {
 128                 return;
 129         }
 130
 131
 132         if (tree) {
 133                 struct timeval tv;
 134
 135                 tv.tv_usec = 0;
 136
 137                 /* We already know that the packet has enough data to fill in
 138                  * the summary info. Retrieve that data */
 139
 140                 who_ti = proto_tree_add_item(tree, proto_who, NullTVB, offset, END_OF_FRAME, NULL);
 141                 who_tree = proto_item_add_subtree(who_ti, ett_who);
 142
 143                 proto_tree_add_item(who_tree, hf_who_vers, NullTVB, offset, 1, pd[offset]);
 144                 offset += 1;
 145
 146
 147                 proto_tree_add_item(who_tree, hf_who_type, NullTVB, offset, 1, pd[offset]);
 148                 offset += 1;
 149
 150                 /* 2 filler bytes */
 151                 offset += 2;
 152
 153                 tv.tv_sec = pntohl(&pd[offset]);
 154                 proto_tree_add_item(who_tree, hf_who_sendtime, NullTVB, offset, 4, &tv);
 155                 offset += 4;
 156
 157                 tv.tv_sec = pntohl(&pd[offset]);
 158                 proto_tree_add_item(who_tree, hf_who_recvtime, NullTVB, offset, 4, &tv);
 159                 offset += 4;
 160
 161                 proto_tree_add_item(who_tree, hf_who_hostname, NullTVB, offset, 32, server_name);
 162                 offset += 32;
 163
 164                 proto_tree_add_item(who_tree, hf_who_loadav_5, NullTVB, offset, 4, loadav_5);
 165                 offset += 4;
 166
 167                 proto_tree_add_item(who_tree, hf_who_loadav_10, NullTVB, offset, 4, loadav_10);
 168                 offset += 4;
 169
 170                 proto_tree_add_item(who_tree, hf_who_loadav_15, NullTVB, offset, 4, loadav_15);
 171                 offset += 4;
 172
 173                 tv.tv_sec = pntohl(&pd[offset]);
 174                 proto_tree_add_item(who_tree, hf_who_boottime, NullTVB, offset, 4, &tv);
 175                 offset += 4;
 176
 177                 dissect_whoent(pd, offset, fd, who_tree);
 178         }
 179 }
 180
 181 /* The man page says that (1024 / sizeof(struct whoent)) is the maximum number
 182  * of whoent structures in the packet. */
 183 #define SIZE_OF_WHOENT  24
 184 #define MAX_NUM_WHOENTS (1024 / SIZE_OF_WHOENT)
 185
 186 static void
 187 dissect_whoent(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
 188 {
 189         proto_tree      *whoent_tree = NULL;
 190         proto_item      *whoent_ti = NULL;
 191         int             line_offset = offset;
 192         gchar           out_line[9];
 193         gchar           out_name[9];
 194         struct timeval  tv;
 195         int             whoent_num = 0;
 196         guint32         idle_secs; /* say that out loud... */
 197
 198         tv.tv_usec = 0;
 199         out_line[8] = '\0';
 200         out_name[8] = '\0';
 201
 202         while (BYTES_ARE_IN_FRAME(line_offset, SIZE_OF_WHOENT) && whoent_num < MAX_NUM_WHOENTS) {
 203                 memcpy(out_line, &pd[line_offset], 8);
 204                 memcpy(out_name, &pd[line_offset+8], 8);
 205
 206                 whoent_ti = proto_tree_add_item(tree, hf_who_whoent, NullTVB, line_offset, SIZE_OF_WHOENT, NULL);
 207                 whoent_tree = proto_item_add_subtree(whoent_ti, ett_whoent);
 208
 209                 proto_tree_add_item(whoent_tree, hf_who_tty, NullTVB, line_offset, 8, out_line);
 210                 line_offset += 8;
 211
 212                 proto_tree_add_item(whoent_tree, hf_who_uid, NullTVB, line_offset, 8, out_name);
 213                 line_offset += 8;
 214
 215                 tv.tv_sec = pntohl(&pd[line_offset]);
 216                 proto_tree_add_item(whoent_tree, hf_who_timeon, NullTVB, line_offset, 4, &tv);
 217                 line_offset += 4;
 218
 219                 idle_secs = pntohl(&pd[line_offset]);
 220                 proto_tree_add_uint_format(whoent_tree, hf_who_idle, NullTVB, line_offset, 4, idle_secs,
 221                                 "Idle: %s", time_secs_to_str(idle_secs));
 222                 line_offset += 4;
 223
 224                 whoent_num++;
 225         }
 226 }
 227
 228 void
 229 proto_register_who(void)
 230 {
 231         static hf_register_info hf[] = {
 232                 { &hf_who_vers,
 233                 { "Version",    "who.vers", FT_UINT8, BASE_DEC, NULL, 0x0,
 234                         "" }},
 235
 236                 { &hf_who_type,
 237                 { "Type",       "who.type", FT_UINT8, BASE_DEC, NULL, 0x0,
 238                         "" }},
 239
 240                 { &hf_who_sendtime,
 241                 { "Send Time",  "who.sendtime", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0,
 242                         "" }},
 243
 244                 { &hf_who_recvtime,
 245                 { "Receive Time", "who.recvtime", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0,
 246                         "" }},
 247
 248                 { &hf_who_hostname,
 249                 { "Hostname", "who.hostname", FT_STRING, BASE_NONE, NULL, 0x0,
 250                         "" }},
 251
 252                 { &hf_who_loadav_5,
 253                 { "Load Average Over Past  5 Minutes", "who.loadav_5", FT_DOUBLE, BASE_NONE, NULL, 0x0,
 254                         "" }},
 255
 256                 { &hf_who_loadav_10,
 257                 { "Load Average Over Past 10 Minutes", "who.loadav_10", FT_DOUBLE, BASE_NONE, NULL, 0x0,
 258                         "" }},
 259
 260                 { &hf_who_loadav_15,
 261                 { "Load Average Over Past 15 Minutes", "who.loadav_15", FT_DOUBLE, BASE_NONE, NULL, 0x0,
 262                         "" }},
 263
 264                 { &hf_who_boottime,
 265                 { "Boot Time", "who.boottime", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0,
 266                         "" }},
 267
 268                 { &hf_who_whoent,
 269                 { "Who utmp Entry", "who.whoent", FT_NONE, BASE_NONE, NULL, 0x0,
 270                         "" }},
 271
 272                 { &hf_who_tty,
 273                 { "TTY Name", "who.tty", FT_STRING, BASE_NONE, NULL, 0x0,
 274                         "" }},
 275
 276                 { &hf_who_uid,
 277                 { "User ID", "who.uid", FT_STRING, BASE_NONE, NULL, 0x0,
 278                         "" }},
 279
 280                 { &hf_who_timeon,
 281                 { "Time On", "who.timeon", FT_ABSOLUTE_TIME, BASE_NONE, NULL, 0x0,
 282                         "" }},
 283
 284                 { &hf_who_idle,
 285                 { "Time Idle", "who.idle", FT_UINT32, BASE_NONE, NULL, 0x0,
 286                         "" }},
 287         };
 288
 289         static gint *ett[] = {
 290                 &ett_who,
 291                 &ett_whoent,
 292         };
 293
 294         proto_who = proto_register_protocol("Who", "who");
 295         proto_register_field_array(proto_who, hf, array_length(hf));
 296         proto_register_subtree_array(ett, array_length(ett));
 297 }
 298
 299 void
 300 proto_reg_handoff_who(void)
 301 {
 302         dissector_add("udp.port", UDP_PORT_WHO, dissect_who);
 303 }