print.c

   1 /* print.c
   2  * Routines for printing packet analysis trees.
   3  *
   4  * $Id$
   5  *
   6  * Gilbert Ramirez <gram@alumni.rice.edu>
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 1998 Gerald Combs
  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 #include <stdio.h>
  32 #include <string.h>
  33
  34 #include <epan/epan.h>
  35 #include <epan/epan_dissect.h>
  36 #include <epan/tvbuff.h>
  37 #include <epan/packet.h>
  38 #include <epan/emem.h>
  39
  40 #include "packet-range.h"
  41 #include "print.h"
  42 #include "ps.h"
  43 #include "file_util.h"
  44 #include <epan/charsets.h>
  45 #include <epan/dissectors/packet-data.h>
  46 #include <epan/dissectors/packet-frame.h>
  47
  48 #define PDML_VERSION "0"
  49 #define PSML_VERSION "0"
  50
  51 typedef struct {
  52         int                     level;
  53         print_stream_t          *stream;
  54         gboolean                success;
  55         GSList                  *src_list;
  56         print_dissections_e     print_dissections;
  57         gboolean                print_hex_for_data;
  58         char_enc                encoding;
  59         epan_dissect_t          *edt;
  60 } print_data;
  61
  62 typedef struct {
  63         int                     level;
  64         FILE                    *fh;
  65         GSList                  *src_list;
  66         epan_dissect_t          *edt;
  67 } write_pdml_data;
  68
  69 typedef struct {
  70     output_fields_t* fields;
  71         epan_dissect_t          *edt;
  72 } write_field_data_t;
  73
  74 struct _output_fields {
  75     gboolean print_header;
  76     gchar separator;
  77     GPtrArray* fields;
  78     GHashTable* field_indicies;
  79     const gchar** field_values;
  80     gchar quote;
  81 };
  82
  83 static const gchar* get_field_hex_value(GSList* src_list, field_info *fi);
  84 static const gchar* get_node_field_value(field_info* fi, epan_dissect_t* edt);
  85 static void proto_tree_print_node(proto_node *node, gpointer data);
  86 static void proto_tree_write_node_pdml(proto_node *node, gpointer data);
  87 static const guint8 *get_field_data(GSList *src_list, field_info *fi);
  88 static void write_pdml_field_hex_value(write_pdml_data *pdata, field_info *fi);
  89 static gboolean print_hex_data_buffer(print_stream_t *stream, const guchar *cp,
  90     guint length, char_enc encoding);
  91 static void ps_clean_string(unsigned char *out, const unsigned char *in,
  92                         int outbuf_size);
  93 static void print_escaped_xml(FILE *fh, const char *unescaped_string);
  94
  95 static void print_pdml_geninfo(proto_tree *tree, FILE *fh);
  96
  97 static void proto_tree_get_node_field_values(proto_node *node, gpointer data);
  98
  99 static FILE *
 100 open_print_dest(int to_file, const char *dest)
 101 {
 102         FILE    *fh;
 103
 104         /* Open the file or command for output */
 105         if (to_file)
 106                 fh = eth_fopen(dest, "w");
 107         else
 108                 fh = popen(dest, "w");
 109
 110         return fh;
 111 }
 112
 113 static gboolean
 114 close_print_dest(int to_file, FILE *fh)
 115 {
 116         /* Close the file or command */
 117         if (to_file)
 118                 return (fclose(fh) == 0);
 119         else
 120                 return (pclose(fh) == 0);
 121 }
 122
 123 #define MAX_PS_LINE_LENGTH 256
 124
 125 gboolean
 126 proto_tree_print(print_args_t *print_args, epan_dissect_t *edt,
 127     print_stream_t *stream)
 128 {
 129         print_data data;
 130
 131         /* Create the output */
 132         data.level = 0;
 133         data.stream = stream;
 134         data.success = TRUE;
 135         data.src_list = edt->pi.data_src;
 136         data.encoding = edt->pi.fd->flags.encoding;
 137         data.print_dissections = print_args->print_dissections;
 138         /* If we're printing the entire packet in hex, don't
 139            print uninterpreted data fields in hex as well. */
 140         data.print_hex_for_data = !print_args->print_hex;
 141         data.edt = edt;
 142
 143         proto_tree_children_foreach(edt->tree, proto_tree_print_node, &data);
 144         return data.success;
 145 }
 146
 147 #define MAX_INDENT      160
 148
 149 /* Print a tree's data, and any child nodes. */
 150 static
 151 void proto_tree_print_node(proto_node *node, gpointer data)
 152 {
 153         field_info      *fi = PITEM_FINFO(node);
 154         print_data      *pdata = (print_data*) data;
 155         const guint8    *pd;
 156         gchar           label_str[ITEM_LABEL_LENGTH];
 157         gchar           *label_ptr;
 158
 159         /* Don't print invisible entries. */
 160         if (PROTO_ITEM_IS_HIDDEN(node))
 161                 return;
 162
 163         /* Give up if we've already gotten an error. */
 164         if (!pdata->success)
 165                 return;
 166
 167         /* was a free format label produced? */
 168         if (fi->rep) {
 169                 label_ptr = fi->rep->representation;
 170         }
 171         else { /* no, make a generic label */
 172                 label_ptr = label_str;
 173                 proto_item_fill_label(fi, label_str);
 174         }
 175
 176         if (PROTO_ITEM_IS_GENERATED(node)) {
 177                 label_ptr = g_strdup_printf("[%s]", label_ptr);
 178         }
 179
 180         if (!print_line(pdata->stream, pdata->level, label_ptr)) {
 181                 pdata->success = FALSE;
 182                 return;
 183         }
 184
 185         if (PROTO_ITEM_IS_GENERATED(node)) {
 186                 g_free(label_ptr);
 187         }
 188
 189         /* If it's uninterpreted data, dump it (unless our caller will
 190            be printing the entire packet in hex). */
 191         if (fi->hfinfo->id == proto_data && pdata->print_hex_for_data) {
 192                 /*
 193                  * Find the data for this field.
 194                  */
 195                 pd = get_field_data(pdata->src_list, fi);
 196                 if (pd) {
 197                         if (!print_hex_data_buffer(pdata->stream, pd,
 198                             fi->length, pdata->encoding)) {
 199                                 pdata->success = FALSE;
 200                                 return;
 201                         }
 202                 }
 203         }
 204
 205         /* If we're printing all levels, or if this node is one with a
 206            subtree and its subtree is expanded, recurse into the subtree,
 207            if it exists. */
 208         g_assert(fi->tree_type >= -1 && fi->tree_type < num_tree_types);
 209         if (pdata->print_dissections == print_dissections_expanded ||
 210             (pdata->print_dissections == print_dissections_as_displayed &&
 211                 fi->tree_type >= 0 && tree_is_expanded[fi->tree_type])) {
 212                 if (node->first_child != NULL) {
 213                         pdata->level++;
 214                         proto_tree_children_foreach(node,
 215                                 proto_tree_print_node, pdata);
 216                         pdata->level--;
 217                         if (!pdata->success)
 218                                 return;
 219                 }
 220         }
 221 }
 222
 223 void
 224 write_pdml_preamble(FILE *fh)
 225 {
 226         fputs("<?xml version=\"1.0\"?>\n", fh);
 227         fputs("<pdml version=\"" PDML_VERSION "\" ", fh);
 228         fprintf(fh, "creator=\"%s/%s\">\n", PACKAGE, VERSION);
 229 }
 230
 231 void
 232 proto_tree_write_pdml(epan_dissect_t *edt, FILE *fh)
 233 {
 234         write_pdml_data data;
 235
 236         /* Create the output */
 237         data.level = 0;
 238         data.fh = fh;
 239         data.src_list = edt->pi.data_src;
 240         data.edt = edt;
 241
 242         fprintf(fh, "<packet>\n");
 243
 244         /* Print a "geninfo" protocol as required by PDML */
 245         print_pdml_geninfo(edt->tree, fh);
 246
 247         proto_tree_children_foreach(edt->tree, proto_tree_write_node_pdml,
 248             &data);
 249
 250         fprintf(fh, "</packet>\n\n");
 251 }
 252
 253 /* Write out a tree's data, and any child nodes, as PDML */
 254 static void
 255 proto_tree_write_node_pdml(proto_node *node, gpointer data)
 256 {
 257         field_info      *fi = PITEM_FINFO(node);
 258         write_pdml_data *pdata = (write_pdml_data*) data;
 259         const gchar     *label_ptr;
 260         gchar           label_str[ITEM_LABEL_LENGTH];
 261         char            *dfilter_string;
 262         int             chop_len;
 263         int             i;
 264
 265         for (i = -1; i < pdata->level; i++) {
 266                 fputs("  ", pdata->fh);
 267         }
 268
 269         /* Text label. It's printed as a field with no name. */
 270         if (fi->hfinfo->id == hf_text_only) {
 271                 /* Get the text */
 272                 if (fi->rep) {
 273                         label_ptr = fi->rep->representation;
 274                 }
 275                 else {
 276                         label_ptr = "";
 277                 }
 278
 279                 /* Show empty name since it is a required field */
 280                 fputs("<field name=\"", pdata->fh);
 281                 fputs("\" show=\"", pdata->fh);
 282                 print_escaped_xml(pdata->fh, label_ptr);
 283
 284                 fprintf(pdata->fh, "\" size=\"%d", fi->length);
 285                 fprintf(pdata->fh, "\" pos=\"%d", fi->start);
 286
 287                 fputs("\" value=\"", pdata->fh);
 288                 write_pdml_field_hex_value(pdata, fi);
 289
 290                 if (node->first_child != NULL) {
 291                         fputs("\">\n", pdata->fh);
 292                 }
 293                 else {
 294                         fputs("\"/>\n", pdata->fh);
 295                 }
 296         }
 297         /* Uninterpreted data, i.e., the "Data" protocol, is
 298          * printed as a field instead of a protocol. */
 299         else if (fi->hfinfo->id == proto_data) {
 300
 301                 fputs("<field name=\"data\" value=\"", pdata->fh);
 302
 303                 write_pdml_field_hex_value(pdata, fi);
 304
 305                 fputs("\"/>\n", pdata->fh);
 306
 307         }
 308         /* Normal protocols and fields */
 309         else {
 310                 if (fi->hfinfo->type == FT_PROTOCOL) {
 311                         fputs("<proto name=\"", pdata->fh);
 312                 }
 313                 else {
 314                         fputs("<field name=\"", pdata->fh);
 315                 }
 316                 print_escaped_xml(pdata->fh, fi->hfinfo->abbrev);
 317
 318 #if 0
 319         /* PDML spec, see:
 320          * http://analyzer.polito.it/30alpha/docs/dissectors/PDMLSpec.htm
 321          *
 322          * the show fields contains things in 'human readable' format
 323          * showname: contains only the name of the field
 324          * show: contains only the data of the field
 325          * showdtl: contains additional details of the field data
 326          * showmap: contains mappings of the field data (e.g. the hostname to an IP address)
 327          *
 328          * XXX - the showname shouldn't contain the field data itself
 329          * (like it's contained in the fi->rep->representation).
 330          * Unfortunately, we don't have the field data representation for
 331          * all fields, so this isn't currently possible */
 332                 fputs("\" showname=\"", pdata->fh);
 333                 print_escaped_xml(pdata->fh, fi->hfinfo->name);
 334 #endif
 335
 336                 if (fi->rep) {
 337                         fputs("\" showname=\"", pdata->fh);
 338                         print_escaped_xml(pdata->fh, fi->rep->representation);
 339                 }
 340                 else {
 341                         label_ptr = label_str;
 342                         proto_item_fill_label(fi, label_str);
 343                         fputs("\" showname=\"", pdata->fh);
 344                         print_escaped_xml(pdata->fh, label_ptr);
 345                 }
 346
 347                 if (PROTO_ITEM_IS_HIDDEN(node))
 348                         fprintf(pdata->fh, "\" hide=\"yes");
 349
 350                 fprintf(pdata->fh, "\" size=\"%d", fi->length);
 351                 fprintf(pdata->fh, "\" pos=\"%d", fi->start);
 352 /*              fprintf(pdata->fh, "\" id=\"%d", fi->hfinfo->id);*/
 353
 354                 /* show, value, and unmaskedvalue attributes */
 355                 switch (fi->hfinfo->type)
 356                 {
 357                 case FT_PROTOCOL:
 358                         break;
 359                 case FT_NONE:
 360                         fputs("\" show=\"\" value=\"",  pdata->fh);
 361                         break;
 362                 default:
 363                         /* XXX - this is a hack until we can just call
 364                          * fvalue_to_string_repr() for *all* FT_* types. */
 365                         dfilter_string = proto_construct_match_selected_string(fi,
 366                             pdata->edt);
 367                         if (dfilter_string != NULL) {
 368                                 chop_len = strlen(fi->hfinfo->abbrev) + 4; /* for " == " */
 369
 370                                 /* XXX - Remove double-quotes. Again, once we
 371                                  * can call fvalue_to_string_repr(), we can
 372                                  * ask it not to produce the version for
 373                                  * display-filters, and thus, no
 374                                  * double-quotes. */
 375                                 if (dfilter_string[strlen(dfilter_string)-1] == '"') {
 376                                         dfilter_string[strlen(dfilter_string)-1] = '\0';
 377                                         chop_len++;
 378                                 }
 379
 380                                 fputs("\" show=\"", pdata->fh);
 381                                 print_escaped_xml(pdata->fh, &dfilter_string[chop_len]);
 382                         }
 383
 384                         /*
 385                          * XXX - should we omit "value" for any fields?
 386                          * What should we do for fields whose length is 0?
 387                          * They might come from a pseudo-header or from
 388                          * the capture header (e.g., time stamps), or
 389                          * they might be generated fields.
 390                          */
 391                         if (fi->length > 0) {
 392                                 fputs("\" value=\"", pdata->fh);
 393
 394                                 if (fi->hfinfo->bitmask!=0) {
 395                                         fprintf(pdata->fh, "%X", fvalue_get_uinteger(&fi->value));
 396                                         fputs("\" unmaskedvalue=\"", pdata->fh);
 397                                         write_pdml_field_hex_value(pdata, fi);
 398                                 }
 399                                 else {
 400                                         write_pdml_field_hex_value(pdata, fi);
 401                                 }
 402                         }
 403                 }
 404
 405                 if (node->first_child != NULL) {
 406                         fputs("\">\n", pdata->fh);
 407                 }
 408                 else if (fi->hfinfo->id == proto_data) {
 409                         fputs("\">\n", pdata->fh);
 410                 }
 411                 else {
 412                         fputs("\"/>\n", pdata->fh);
 413                 }
 414         }
 415
 416         /* We always print all levels for PDML. Recurse here. */
 417         if (node->first_child != NULL) {
 418                 pdata->level++;
 419                 proto_tree_children_foreach(node,
 420                                 proto_tree_write_node_pdml, pdata);
 421                 pdata->level--;
 422         }
 423
 424         if (node->first_child != NULL) {
 425                 for (i = -1; i < pdata->level; i++) {
 426                         fputs("  ", pdata->fh);
 427                 }
 428                 if (fi->hfinfo->id != proto_data) {   /* Data protocol uses simple tags */
 429                         if (fi->hfinfo->type == FT_PROTOCOL) {
 430                                 fputs("</proto>\n", pdata->fh);
 431                         }
 432                         else {
 433                                 fputs("</field>\n", pdata->fh);
 434                         }
 435                 }
 436         }
 437 }
 438
 439 /* Print info for a 'geninfo' pseudo-protocol. This is required by
 440  * the PDML spec. The information is contained in Wireshark's 'frame' protocol,
 441  * but we produce a 'geninfo' protocol in the PDML to conform to spec.
 442  * The 'frame' protocol follows the 'geninfo' protocol in the PDML. */
 443 static void
 444 print_pdml_geninfo(proto_tree *tree, FILE *fh)
 445 {
 446         guint32 num, len, caplen;
 447         nstime_t *timestamp;
 448         GPtrArray *finfo_array;
 449         field_info *frame_finfo;
 450
 451         /* Get frame protocol's finfo. */
 452         finfo_array = proto_find_finfo(tree, proto_frame);
 453         if (g_ptr_array_len(finfo_array) < 1) {
 454                 return;
 455         }
 456         frame_finfo = finfo_array->pdata[0];
 457         g_ptr_array_free(finfo_array, FALSE);
 458
 459         /* frame.number --> geninfo.num */
 460         finfo_array = proto_find_finfo(tree, hf_frame_number);
 461         if (g_ptr_array_len(finfo_array) < 1) {
 462                 return;
 463         }
 464         num = fvalue_get_uinteger(&((field_info*)finfo_array->pdata[0])->value);
 465         g_ptr_array_free(finfo_array, FALSE);
 466
 467         /* frame.pkt_len --> geninfo.len */
 468         finfo_array = proto_find_finfo(tree, hf_frame_packet_len);
 469         if (g_ptr_array_len(finfo_array) < 1) {
 470                 return;
 471         }
 472         len = fvalue_get_uinteger(&((field_info*)finfo_array->pdata[0])->value);
 473         g_ptr_array_free(finfo_array, FALSE);
 474
 475         /* frame.cap_len --> geninfo.caplen */
 476         finfo_array = proto_find_finfo(tree, hf_frame_capture_len);
 477         if (g_ptr_array_len(finfo_array) < 1) {
 478                 return;
 479         }
 480         caplen = fvalue_get_uinteger(&((field_info*)finfo_array->pdata[0])->value);
 481         g_ptr_array_free(finfo_array, FALSE);
 482
 483         /* frame.time --> geninfo.timestamp */
 484         finfo_array = proto_find_finfo(tree, hf_frame_arrival_time);
 485         if (g_ptr_array_len(finfo_array) < 1) {
 486                 return;
 487         }
 488         timestamp = fvalue_get(&((field_info*)finfo_array->pdata[0])->value);
 489         g_ptr_array_free(finfo_array, FALSE);
 490
 491         /* Print geninfo start */
 492         fprintf(fh,
 493 "  <proto name=\"geninfo\" pos=\"0\" showname=\"General information\" size=\"%u\">\n",
 494                 frame_finfo->length);
 495
 496         /* Print geninfo.num */
 497         fprintf(fh,
 498 "    <field name=\"num\" pos=\"0\" show=\"%u\" showname=\"Number\" value=\"%x\" size=\"%u\"/>\n",
 499                 num, num, frame_finfo->length);
 500
 501         /* Print geninfo.len */
 502         fprintf(fh,
 503 "    <field name=\"len\" pos=\"0\" show=\"%u\" showname=\"Packet Length\" value=\"%x\" size=\"%u\"/>\n",
 504                 len, len, frame_finfo->length);
 505
 506         /* Print geninfo.caplen */
 507         fprintf(fh,
 508 "    <field name=\"caplen\" pos=\"0\" show=\"%u\" showname=\"Captured Length\" value=\"%x\" size=\"%u\"/>\n",
 509                 caplen, caplen, frame_finfo->length);
 510
 511         /* Print geninfo.timestamp */
 512         fprintf(fh,
 513 "    <field name=\"timestamp\" pos=\"0\" show=\"%s\" showname=\"Captured Time\" value=\"%d.%09d\" size=\"%u\"/>\n",
 514                 abs_time_to_str(timestamp), (int) timestamp->secs, timestamp->nsecs, frame_finfo->length);
 515
 516         /* Print geninfo end */
 517         fprintf(fh,
 518 "  </proto>\n");
 519 }
 520
 521 void
 522 write_pdml_finale(FILE *fh)
 523 {
 524         fputs("</pdml>\n", fh);
 525 }
 526
 527 void
 528 write_psml_preamble(FILE *fh)
 529 {
 530         fputs("<?xml version=\"1.0\"?>\n", fh);
 531         fputs("<psml version=\"" PSML_VERSION "\" ", fh);
 532         fprintf(fh, "creator=\"%s/%s\">\n", PACKAGE, VERSION);
 533 }
 534
 535 void
 536 proto_tree_write_psml(epan_dissect_t *edt, FILE *fh)
 537 {
 538         gint    i;
 539
 540         /* if this is the first packet, we have to create the PSML structure output */
 541         if(edt->pi.fd->num == 1) {
 542             fprintf(fh, "<structure>\n");
 543
 544             for(i=0; i < edt->pi.cinfo->num_cols; i++) {
 545                 fprintf(fh, "<section>");
 546                 print_escaped_xml(fh, edt->pi.cinfo->col_title[i]);
 547                 fprintf(fh, "</section>\n");
 548             }
 549
 550             fprintf(fh, "</structure>\n\n");
 551         }
 552
 553         fprintf(fh, "<packet>\n");
 554
 555         for(i=0; i < edt->pi.cinfo->num_cols; i++) {
 556             fprintf(fh, "<section>");
 557             print_escaped_xml(fh, edt->pi.cinfo->col_data[i]);
 558             fprintf(fh, "</section>\n");
 559         }
 560
 561         fprintf(fh, "</packet>\n\n");
 562 }
 563
 564 void
 565 write_psml_finale(FILE *fh)
 566 {
 567         fputs("</psml>\n", fh);
 568 }
 569
 570 void
 571 write_csv_preamble(FILE *fh _U_)
 572 {
 573
 574 }
 575
 576 void
 577 proto_tree_write_csv(epan_dissect_t *edt, FILE *fh)
 578 {
 579         gint    i;
 580
 581         /* if this is the first packet, we have to write the CSV header */
 582         if(edt->pi.fd->num == 1) {
 583             for(i=0; i < edt->pi.cinfo->num_cols - 1; i++)
 584                 fprintf(fh, "\"%s\",", edt->pi.cinfo->col_title[i]);
 585
 586             fprintf(fh, "\"%s\"\n", edt->pi.cinfo->col_title[i]);
 587         }
 588
 589         for(i=0; i < edt->pi.cinfo->num_cols - 1; i++)
 590             fprintf(fh, "\"%s\",", edt->pi.cinfo->col_data[i]);
 591
 592         fprintf(fh, "\"%s\"\n", edt->pi.cinfo->col_data[i]);
 593 }
 594
 595 void
 596 write_csv_finale(FILE *fh _U_)
 597 {
 598
 599 }
 600
 601 /*
 602  * Find the data source for a specified field, and return a pointer
 603  * to the data in it. Returns NULL if the data is out of bounds.
 604  */
 605 static const guint8 *
 606 get_field_data(GSList *src_list, field_info *fi)
 607 {
 608         GSList *src_le;
 609         data_source *src;
 610         tvbuff_t *src_tvb;
 611         gint length, tvbuff_length;
 612
 613         for (src_le = src_list; src_le != NULL; src_le = src_le->next) {
 614                 src = src_le->data;
 615                 src_tvb = src->tvb;
 616                 if (fi->ds_tvb == src_tvb) {
 617                         /*
 618                          * Found it.
 619                          *
 620                          * XXX - a field can have a length that runs past
 621                          * the end of the tvbuff.  Ideally, that should
 622                          * be fixed when adding an item to the protocol
 623                          * tree, but checking the length when doing
 624                          * that could be expensive.  Until we fix that,
 625                          * we'll do the check here.
 626                          */
 627                         tvbuff_length = tvb_length_remaining(src_tvb,
 628                             fi->start);
 629                         if (tvbuff_length < 0) {
 630                                 return NULL;
 631                         }
 632                         length = fi->length;
 633                         if (length > tvbuff_length)
 634                                 length = tvbuff_length;
 635                         return tvb_get_ptr(src_tvb, fi->start, length);
 636                 }
 637         }
 638         g_assert_not_reached();
 639         return NULL;    /* not found */
 640 }
 641
 642 /* Print a string, escaping out certain characters that need to
 643  * escaped out for XML. */
 644 static void
 645 print_escaped_xml(FILE *fh, const char *unescaped_string)
 646 {
 647         const char *p;
 648
 649         for (p = unescaped_string; *p != '\0'; p++) {
 650                 switch (*p) {
 651                         case '&':
 652                                 fputs("&amp;", fh);
 653                                 break;
 654                         case '<':
 655                                 fputs("&lt;", fh);
 656                                 break;
 657                         case '>':
 658                                 fputs("&gt;", fh);
 659                                 break;
 660                         case '"':
 661                                 fputs("&quot;", fh);
 662                                 break;
 663                         case '\'':
 664                                 fputs("&apos;", fh);
 665                                 break;
 666                         default:
 667                                 fputc(*p, fh);
 668                 }
 669         }
 670 }
 671
 672 static void
 673 write_pdml_field_hex_value(write_pdml_data *pdata, field_info *fi)
 674 {
 675         int i;
 676         const guint8 *pd;
 677
 678         if (fi->length > tvb_length_remaining(fi->ds_tvb, fi->start)) {
 679                 fprintf(pdata->fh, "field length invalid!");
 680                 return;
 681         }
 682
 683         /* Find the data for this field. */
 684         pd = get_field_data(pdata->src_list, fi);
 685
 686         if (pd) {
 687                 /* Print a simple hex dump */
 688                 for (i = 0 ; i < fi->length; i++) {
 689                         fprintf(pdata->fh, "%02x", pd[i]);
 690                 }
 691         }
 692 }
 693
 694 gboolean
 695 print_hex_data(print_stream_t *stream, epan_dissect_t *edt)
 696 {
 697         gboolean multiple_sources;
 698         GSList *src_le;
 699         data_source *src;
 700         tvbuff_t *tvb;
 701         char *name;
 702         char *line;
 703         const guchar *cp;
 704         guint length;
 705
 706         /*
 707          * Set "multiple_sources" iff this frame has more than one
 708          * data source; if it does, we need to print the name of
 709          * the data source before printing the data from the
 710          * data source.
 711          */
 712         multiple_sources = (edt->pi.data_src->next != NULL);
 713
 714         for (src_le = edt->pi.data_src; src_le != NULL;
 715             src_le = src_le->next) {
 716                 src = src_le->data;
 717                 tvb = src->tvb;
 718                 if (multiple_sources) {
 719                         name = src->name;
 720                         print_line(stream, 0, "");
 721                         line = g_malloc(strlen(name) + 2);      /* <name>:\0 */
 722                         strcpy(line, name);
 723                         strcat(line, ":");
 724                         print_line(stream, 0, line);
 725                         g_free(line);
 726                 }
 727                 length = tvb_length(tvb);
 728                 if (length == 0)
 729                     return TRUE;
 730                 cp = tvb_get_ptr(tvb, 0, length);
 731                 if (!print_hex_data_buffer(stream, cp, length,
 732                     edt->pi.fd->flags.encoding))
 733                         return FALSE;
 734         }
 735         return TRUE;
 736 }
 737
 738 /*
 739  * This routine is based on a routine created by Dan Lasley
 740  * <DLASLEY@PROMUS.com>.
 741  *
 742  * It was modified for Wireshark by Gilbert Ramirez and others.
 743  */
 744
 745 #define MAX_OFFSET_LEN  8       /* max length of hex offset of bytes */
 746 #define BYTES_PER_LINE  16      /* max byte values printed on a line */
 747 #define HEX_DUMP_LEN    (BYTES_PER_LINE*3)
 748                                 /* max number of characters hex dump takes -
 749                                    2 digits plus trailing blank */
 750 #define DATA_DUMP_LEN   (HEX_DUMP_LEN + 2 + BYTES_PER_LINE)
 751                                 /* number of characters those bytes take;
 752                                    3 characters per byte of hex dump,
 753                                    2 blanks separating hex from ASCII,
 754                                    1 character per byte of ASCII dump */
 755 #define MAX_LINE_LEN    (MAX_OFFSET_LEN + 2 + DATA_DUMP_LEN)
 756                                 /* number of characters per line;
 757                                    offset, 2 blanks separating offset
 758                                    from data dump, data dump */
 759
 760 static gboolean
 761 print_hex_data_buffer(print_stream_t *stream, const guchar *cp,
 762     guint length, char_enc encoding)
 763 {
 764         register unsigned int ad, i, j, k, l;
 765         guchar c;
 766         guchar line[MAX_LINE_LEN + 1];
 767         unsigned int use_digits;
 768         static guchar binhex[16] = {
 769                 '0', '1', '2', '3', '4', '5', '6', '7',
 770                 '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
 771
 772         if (!print_line(stream, 0, ""))
 773                 return FALSE;
 774
 775         /*
 776          * How many of the leading digits of the offset will we supply?
 777          * We always supply at least 4 digits, but if the maximum offset
 778          * won't fit in 4 digits, we use as many digits as will be needed.
 779          */
 780         if (((length - 1) & 0xF0000000) != 0)
 781                 use_digits = 8; /* need all 8 digits */
 782         else if (((length - 1) & 0x0F000000) != 0)
 783                 use_digits = 7; /* need 7 digits */
 784         else if (((length - 1) & 0x00F00000) != 0)
 785                 use_digits = 6; /* need 6 digits */
 786         else if (((length - 1) & 0x000F0000) != 0)
 787                 use_digits = 5; /* need 5 digits */
 788         else
 789                 use_digits = 4; /* we'll supply 4 digits */
 790
 791         ad = 0;
 792         i = 0;
 793         j = 0;
 794         k = 0;
 795         while (i < length) {
 796                 if ((i & 15) == 0) {
 797                         /*
 798                          * Start of a new line.
 799                          */
 800                         j = 0;
 801                         k = 0;
 802                         l = use_digits;
 803                         do {
 804                                 l--;
 805                                 c = (ad >> (l*4)) & 0xF;
 806                                 line[j++] = binhex[c];
 807                         } while (l != 0);
 808                         line[j++] = ' ';
 809                         line[j++] = ' ';
 810                         memset(line+j, ' ', DATA_DUMP_LEN);
 811
 812                         /*
 813                          * Offset in line of ASCII dump.
 814                          */
 815                         k = j + HEX_DUMP_LEN + 2;
 816                 }
 817                 c = *cp++;
 818                 line[j++] = binhex[c>>4];
 819                 line[j++] = binhex[c&0xf];
 820                 j++;
 821                 if (encoding == CHAR_EBCDIC) {
 822                         c = EBCDIC_to_ASCII1(c);
 823                 }
 824                 line[k++] = c >= ' ' && c < 0x7f ? c : '.';
 825                 i++;
 826                 if ((i & 15) == 0 || i == length) {
 827                         /*
 828                          * We'll be starting a new line, or
 829                          * we're finished printing this buffer;
 830                          * dump out the line we've constructed,
 831                          * and advance the offset.
 832                          */
 833                         line[k] = '\0';
 834                         if (!print_line(stream, 0, line))
 835                                 return FALSE;
 836                         ad += 16;
 837                 }
 838         }
 839         return TRUE;
 840 }
 841
 842 static
 843 void ps_clean_string(unsigned char *out, const unsigned char *in,
 844                         int outbuf_size)
 845 {
 846         int rd, wr;
 847         char c;
 848
 849         for (rd = 0, wr = 0 ; wr < outbuf_size; rd++, wr++ ) {
 850                 c = in[rd];
 851                 switch (c) {
 852                         case '(':
 853                         case ')':
 854                         case '\\':
 855                                 out[wr] = '\\';
 856                                 out[++wr] = c;
 857                                 break;
 858
 859                         default:
 860                                 out[wr] = c;
 861                                 break;
 862                 }
 863
 864                 if (c == 0) {
 865                         break;
 866                 }
 867         }
 868 }
 869
 870 /* Some formats need stuff at the beginning of the output */
 871 gboolean
 872 print_preamble(print_stream_t *self, gchar *filename)
 873 {
 874         return (self->ops->print_preamble)(self, filename);
 875 }
 876
 877 gboolean
 878 print_line(print_stream_t *self, int indent, const char *line)
 879 {
 880         return (self->ops->print_line)(self, indent, line);
 881 }
 882
 883 /* Insert bookmark */
 884 gboolean
 885 print_bookmark(print_stream_t *self, const gchar *name, const gchar *title)
 886 {
 887         return (self->ops->print_bookmark)(self, name, title);
 888 }
 889
 890 gboolean
 891 new_page(print_stream_t *self)
 892 {
 893         return (self->ops->new_page)(self);
 894 }
 895
 896 /* Some formats need stuff at the end of the output */
 897 gboolean
 898 print_finale(print_stream_t *self)
 899 {
 900         return (self->ops->print_finale)(self);
 901 }
 902
 903 gboolean
 904 destroy_print_stream(print_stream_t *self)
 905 {
 906         return (self->ops->destroy)(self);
 907 }
 908
 909 typedef struct {
 910         int to_file;
 911         FILE *fh;
 912 } output_text;
 913
 914 static gboolean
 915 print_preamble_text(print_stream_t *self _U_, gchar *filename _U_)
 916 {
 917         /* do nothing */
 918         return TRUE;    /* always succeeds */
 919 }
 920
 921 static gboolean
 922 print_line_text(print_stream_t *self, int indent, const char *line)
 923 {
 924         output_text *output = self->data;
 925         char space[MAX_INDENT+1];
 926         int i;
 927         int num_spaces;
 928
 929         /* Prepare the tabs for printing, depending on tree level */
 930         num_spaces = indent * 4;
 931         if (num_spaces > MAX_INDENT) {
 932                 num_spaces = MAX_INDENT;
 933         }
 934         for (i = 0; i < num_spaces; i++) {
 935                 space[i] = ' ';
 936         }
 937         /* The string is NUL-terminated */
 938         space[num_spaces] = '\0';
 939
 940         fputs(space, output->fh);
 941         fputs(line, output->fh);
 942         putc('\n', output->fh);
 943         return !ferror(output->fh);
 944 }
 945
 946 static gboolean
 947 print_bookmark_text(print_stream_t *self _U_, const gchar *name _U_,
 948     const gchar *title _U_)
 949 {
 950         /* do nothing */
 951         return TRUE;
 952 }
 953
 954 static gboolean
 955 new_page_text(print_stream_t *self)
 956 {
 957         output_text *output = self->data;
 958
 959         fputs("\f", output->fh);
 960         return !ferror(output->fh);
 961 }
 962
 963 static gboolean
 964 print_finale_text(print_stream_t *self _U_)
 965 {
 966         /* do nothing */
 967         return TRUE;    /* always succeeds */
 968 }
 969
 970 static gboolean
 971 destroy_text(print_stream_t *self)
 972 {
 973         output_text *output = self->data;
 974         gboolean ret;
 975
 976         ret = close_print_dest(output->to_file, output->fh);
 977         g_free(output);
 978         g_free(self);
 979         return ret;
 980 }
 981
 982 static const print_stream_ops_t print_text_ops = {
 983         print_preamble_text,
 984         print_line_text,
 985         print_bookmark_text,
 986         new_page_text,
 987         print_finale_text,
 988         destroy_text
 989 };
 990
 991 print_stream_t *
 992 print_stream_text_new(int to_file, const char *dest)
 993 {
 994         FILE *fh;
 995         print_stream_t *stream;
 996         output_text *output;
 997
 998         fh = open_print_dest(to_file, dest);
 999         if (fh == NULL)
1000                 return NULL;
1001
1002         output = g_malloc(sizeof *output);
1003         output->to_file = to_file;
1004         output->fh = fh;
1005         stream = g_malloc(sizeof (print_stream_t));
1006         stream->ops = &print_text_ops;
1007         stream->data = output;
1008
1009         return stream;
1010 }
1011
1012 print_stream_t *
1013 print_stream_text_stdio_new(FILE *fh)
1014 {
1015         print_stream_t *stream;
1016         output_text *output;
1017
1018         output = g_malloc(sizeof *output);
1019         output->to_file = TRUE;
1020         output->fh = fh;
1021         stream = g_malloc(sizeof (print_stream_t));
1022         stream->ops = &print_text_ops;
1023         stream->data = output;
1024
1025         return stream;
1026 }
1027
1028 typedef struct {
1029         int to_file;
1030         FILE *fh;
1031 } output_ps;
1032
1033 static gboolean
1034 print_preamble_ps(print_stream_t *self, gchar *filename)
1035 {
1036         output_ps *output = self->data;
1037         unsigned char psbuffer[MAX_PS_LINE_LENGTH]; /* static sized buffer! */
1038
1039         print_ps_preamble(output->fh);
1040
1041         fputs("%% Set the font to 10 point\n", output->fh);
1042         fputs("/Courier findfont 10 scalefont setfont\n", output->fh);
1043         fputs("\n", output->fh);
1044         fputs("%% the page title\n", output->fh);
1045         ps_clean_string(psbuffer, filename, MAX_PS_LINE_LENGTH);
1046         fprintf(output->fh, "/eth_pagetitle (%s - Wireshark) def\n", psbuffer);
1047         fputs("\n", output->fh);
1048         return !ferror(output->fh);
1049 }
1050
1051 static gboolean
1052 print_line_ps(print_stream_t *self, int indent, const char *line)
1053 {
1054         output_ps *output = self->data;
1055         unsigned char psbuffer[MAX_PS_LINE_LENGTH]; /* static sized buffer! */
1056
1057         ps_clean_string(psbuffer, line, MAX_PS_LINE_LENGTH);
1058         fprintf(output->fh, "%d (%s) putline\n", indent, psbuffer);
1059         return !ferror(output->fh);
1060 }
1061
1062 static gboolean
1063 print_bookmark_ps(print_stream_t *self, const gchar *name, const gchar *title)
1064 {
1065         output_ps *output = self->data;
1066         unsigned char psbuffer[MAX_PS_LINE_LENGTH]; /* static sized buffer! */
1067
1068         /*
1069          * See the Adobe "pdfmark reference":
1070          *
1071          *      http://partners.adobe.com/asn/acrobat/docs/pdfmark.pdf
1072          *
1073          * The pdfmark stuff tells code that turns PostScript into PDF
1074          * things that it should do.
1075          *
1076          * The /OUT stuff creates a bookmark that goes to the
1077          * destination with "name" as the name and "title" as the title.
1078          *
1079          * The "/DEST" creates the destination.
1080          */
1081         ps_clean_string(psbuffer, title, MAX_PS_LINE_LENGTH);
1082         fprintf(output->fh, "[/Dest /%s /Title (%s)   /OUT pdfmark\n", name,
1083             psbuffer);
1084         fputs("[/View [/XYZ -4 currentpoint matrix currentmatrix matrix defaultmatrix\n",
1085             output->fh);
1086         fputs("matrix invertmatrix matrix concatmatrix transform exch pop 20 add null]\n",
1087             output->fh);
1088         fprintf(output->fh, "/Dest /%s /DEST pdfmark\n", name);
1089         return !ferror(output->fh);
1090 }
1091
1092 static gboolean
1093 new_page_ps(print_stream_t *self)
1094 {
1095         output_ps *output = self->data;
1096
1097         fputs("formfeed\n", output->fh);
1098         return !ferror(output->fh);
1099 }
1100
1101 static gboolean
1102 print_finale_ps(print_stream_t *self)
1103 {
1104         output_ps *output = self->data;
1105
1106         print_ps_finale(output->fh);
1107         return !ferror(output->fh);
1108 }
1109
1110 static gboolean
1111 destroy_ps(print_stream_t *self)
1112 {
1113         output_ps *output = self->data;
1114         gboolean ret;
1115
1116         ret = close_print_dest(output->to_file, output->fh);
1117         g_free(output);
1118         g_free(self);
1119         return ret;
1120 }
1121
1122 static const print_stream_ops_t print_ps_ops = {
1123         print_preamble_ps,
1124         print_line_ps,
1125         print_bookmark_ps,
1126         new_page_ps,
1127         print_finale_ps,
1128         destroy_ps
1129 };
1130
1131 print_stream_t *
1132 print_stream_ps_new(int to_file, const char *dest)
1133 {
1134         FILE *fh;
1135         print_stream_t *stream;
1136         output_ps *output;
1137
1138         fh = open_print_dest(to_file, dest);
1139         if (fh == NULL)
1140                 return NULL;
1141
1142         output = g_malloc(sizeof *output);
1143         output->to_file = to_file;
1144         output->fh = fh;
1145         stream = g_malloc(sizeof (print_stream_t));
1146         stream->ops = &print_ps_ops;
1147         stream->data = output;
1148
1149         return stream;
1150 }
1151
1152 print_stream_t *
1153 print_stream_ps_stdio_new(FILE *fh)
1154 {
1155         print_stream_t *stream;
1156         output_ps *output;
1157
1158         output = g_malloc(sizeof *output);
1159         output->to_file = TRUE;
1160         output->fh = fh;
1161         stream = g_malloc(sizeof (print_stream_t));
1162         stream->ops = &print_ps_ops;
1163         stream->data = output;
1164
1165         return stream;
1166 }
1167
1168 output_fields_t* output_fields_new()
1169 {
1170     output_fields_t* fields = g_new(output_fields_t, 1);
1171     fields->print_header = FALSE;
1172     fields->separator = '\t';
1173     fields->fields = NULL; /*Do lazy initialisation */
1174     fields->field_indicies = NULL;
1175     fields->field_values = NULL;
1176     fields->quote='\0';
1177     return fields;
1178 }
1179
1180 gsize output_fields_num_fields(output_fields_t* fields)
1181 {
1182     g_assert(fields);
1183
1184     if(NULL == fields->fields) {
1185         return 0;
1186     } else {
1187         return fields->fields->len;
1188     }
1189 }
1190
1191 void output_fields_free(output_fields_t* fields)
1192 {
1193     g_assert(fields);
1194
1195     if(NULL != fields->field_indicies) {
1196         /* Keys are stored in fields->fields, values are
1197          * integers.
1198          */
1199         g_hash_table_destroy(fields->field_indicies);
1200     }
1201     if(NULL != fields->fields) {
1202         gsize i;
1203         for(i = 0; i < fields->fields->len; ++i) {
1204             gchar* field = g_ptr_array_index(fields->fields,i);
1205             g_free(field);
1206         }
1207         g_ptr_array_free(fields->fields, TRUE);
1208     }
1209
1210     g_free(fields);
1211 }
1212
1213 void output_fields_add(output_fields_t* fields, const gchar* field)
1214 {
1215     gchar* field_copy;
1216
1217     g_assert(fields);
1218     g_assert(field);
1219
1220
1221     if(NULL == fields->fields) {
1222         fields->fields = g_ptr_array_new();
1223     }
1224
1225     field_copy = g_strdup(field);
1226
1227     g_ptr_array_add(fields->fields, field_copy);
1228 }
1229
1230 gboolean output_fields_set_option(output_fields_t* info, gchar* option)
1231 {
1232     const gchar* option_name;
1233     const gchar* option_value;
1234
1235     g_assert(info);
1236     g_assert(option);
1237
1238     if('\0' == *option) {
1239         return FALSE; /* Is this guarded against by option parsing? */
1240     }
1241     option_name = strtok(option,"=");
1242     option_value = option + strlen(option_name) + 1;
1243     if(0 == strcmp(option_name, "header")) {
1244         switch(NULL == option_value ? '\0' : *option_value) {
1245         case 'n':
1246             info->print_header = FALSE;
1247             break;
1248         case 'y':
1249             info->print_header = TRUE;
1250             break;
1251         default:
1252             return FALSE;
1253         }
1254         return TRUE;
1255     }
1256
1257     if(0 == strcmp(option_name,"separator")) {
1258         switch(NULL == option_value ? '\0' : *option_value) {
1259         case '\0':
1260             return FALSE;
1261         case '/':
1262             switch(*++option_value) {
1263             case 't':
1264                 info->separator = '\t';
1265                 break;
1266             case 's':
1267                 info->separator = ' ';
1268                 break;
1269             default:
1270                 info->separator = '\\';
1271             }
1272             break;
1273         default:
1274             info->separator = *option_value;
1275             break;
1276         }
1277         return TRUE;
1278     }
1279
1280     if(0 == strcmp(option_name, "quote")) {
1281         switch(NULL == option_value ? '\0' : *option_value) {
1282         default: /* Fall through */
1283         case '\0':
1284             info->quote='\0';
1285             return FALSE;
1286         case 'd':
1287             info->quote='"';
1288             break;
1289         case 's':
1290             info->quote='\'';
1291             break;
1292         case 'n':
1293             info->quote='\0';
1294             break;
1295         }
1296         return TRUE;
1297     }
1298
1299     return FALSE;
1300 }
1301
1302 void output_fields_list_options(FILE *fh)
1303 {
1304     fprintf(fh, "TShark: The available options for field output \"E\" are:\n");
1305     fputs("header=y|n   Print field abbreviations as first line of output (def: N: no)\n", fh);
1306     fputs("separator=/t|/s|<character>   Set the separator to use; \"/t\" = tab,\n \"/s\" = space (def: /t: tab)\n", fh);
1307     fputs("quote=d|s|n   Print either d: double-quotes, s: single quotes or n: no quotes around field values (def: n: none)\n", fh);
1308 }
1309
1310
1311 void write_fields_preamble(output_fields_t* fields, FILE *fh)
1312 {
1313     gsize i;
1314
1315     g_assert(fields);
1316     g_assert(fh);
1317
1318     if(!fields->print_header) {
1319         return;
1320     }
1321
1322     for(i = 0; i < fields->fields->len; ++i) {
1323         const gchar* field = g_ptr_array_index(fields->fields,i);
1324         if(i != 0 ) {
1325             fputc(fields->separator, fh);
1326         }
1327         fputs(field, fh);
1328     }
1329     fputc('\n', fh);
1330 }
1331
1332 static void proto_tree_get_node_field_values(proto_node *node, gpointer data)
1333 {
1334     write_field_data_t *call_data;
1335     field_info *fi;
1336     gpointer field_index;
1337
1338     call_data = data;
1339     fi = PITEM_FINFO(node);
1340
1341     field_index = g_hash_table_lookup(call_data->fields->field_indicies, fi->hfinfo->abbrev);
1342     if(NULL != field_index) {
1343         const gchar* value;
1344
1345         value = get_node_field_value(fi, call_data->edt); /* ep_alloced string */
1346
1347         if(NULL != value && '\0' != *value) {
1348             guint actual_index;
1349             actual_index = GPOINTER_TO_UINT(field_index);
1350             /* Unwrap change made to disambiguiate zero / null */
1351             call_data->fields->field_values[actual_index - 1] = value;
1352         }
1353     }
1354
1355     /* Recurse here. */
1356     if (node->first_child != NULL) {
1357         proto_tree_children_foreach(node, proto_tree_get_node_field_values,
1358                                     call_data);
1359     }
1360 }
1361
1362 void proto_tree_write_fields(output_fields_t* fields, epan_dissect_t *edt, FILE *fh)
1363 {
1364     gsize i;
1365
1366     write_field_data_t data;
1367
1368     g_assert(fields);
1369     g_assert(edt);
1370     g_assert(fh);
1371
1372     data.fields = fields;
1373     data.edt = edt;
1374
1375     if(NULL == fields->field_indicies) {
1376         /* Prepare a lookup table from string abbreviation for field to its index. */
1377         fields->field_indicies = g_hash_table_new(g_str_hash, g_str_equal);
1378
1379         i = 0;
1380         while( i < fields->fields->len) {
1381             gchar* field = g_ptr_array_index(fields->fields, i);
1382              /* Store field indicies +1 so that zero is not a valid value,
1383               * and can be distinguished from NULL as a pointer.
1384               */
1385             ++i;
1386             g_hash_table_insert(fields->field_indicies, field, GUINT_TO_POINTER(i));
1387         }
1388     }
1389
1390     /* Buffer to store values for this packet */
1391     fields->field_values = ep_alloc_array0(const gchar*, fields->fields->len);
1392
1393     proto_tree_children_foreach(edt->tree, proto_tree_get_node_field_values,
1394                                 &data);
1395
1396     for(i = 0; i < fields->fields->len; ++i) {
1397         if(0 != i) {
1398             fputc(fields->separator, fh);
1399         }
1400         if(NULL != fields->field_values[i]) {
1401             if(fields->quote != '\0') {
1402                 fputc(fields->quote, fh);
1403             }
1404             fputs(fields->field_values[i], fh);
1405             if(fields->quote != '\0') {
1406                 fputc(fields->quote, fh);
1407             }
1408         }
1409     }
1410 }
1411
1412 void write_fields_finale(output_fields_t* fields _U_ , FILE *fh _U_)
1413 {
1414     /* Nothing to do */
1415 }
1416
1417 /* Returns an ep_alloced string or a static constant*/
1418 static const gchar* get_node_field_value(field_info* fi, epan_dissect_t* edt)
1419 {
1420     if (fi->hfinfo->id == hf_text_only) {
1421         /* Text label.
1422          * Get the text */
1423         if (fi->rep) {
1424             return fi->rep->representation;
1425         }
1426         else {
1427             return get_field_hex_value(edt->pi.data_src, fi);
1428         }
1429     }
1430     else if (fi->hfinfo->id == proto_data) {
1431         /* Uninterpreted data, i.e., the "Data" protocol, is
1432          * printed as a field instead of a protocol. */
1433         return get_field_hex_value(edt->pi.data_src, fi);
1434     }
1435     else {
1436         /* Normal protocols and fields */
1437         gchar      *dfilter_string;
1438         gint        chop_len;
1439
1440         switch (fi->hfinfo->type)
1441         {
1442         case FT_PROTOCOL:
1443             /* Print out the full details for the protocol. */
1444             if (fi->rep) {
1445                 return fi->rep->representation;
1446             } else {
1447                 /* Just print out the protocol abbreviation */
1448                 return fi->hfinfo->abbrev;;
1449             }
1450         case FT_NONE:
1451             /* Return "1" so that the presence of a field of type
1452              * FT_NONE can be checked when using -T fields */
1453             return "1";
1454         default:
1455             /* XXX - this is a hack until we can just call
1456              * fvalue_to_string_repr() for *all* FT_* types. */
1457             dfilter_string = proto_construct_match_selected_string(fi,
1458                 edt);
1459             if (dfilter_string != NULL) {
1460                 chop_len = strlen(fi->hfinfo->abbrev) + 4; /* for " == " */
1461
1462                 /* XXX - Remove double-quotes. Again, once we
1463                  * can call fvalue_to_string_repr(), we can
1464                  * ask it not to produce the version for
1465                  * display-filters, and thus, no
1466                  * double-quotes. */
1467                 if (dfilter_string[strlen(dfilter_string)-1] == '"') {
1468                     dfilter_string[strlen(dfilter_string)-1] = '\0';
1469                     chop_len++;
1470                 }
1471
1472                 return &(dfilter_string[chop_len]);
1473             } else {
1474                 return get_field_hex_value(edt->pi.data_src, fi);
1475             }
1476         }
1477     }
1478 }
1479
1480 static const gchar*
1481 get_field_hex_value(GSList* src_list, field_info *fi)
1482 {
1483     const guint8 *pd;
1484
1485     if (fi->length > tvb_length_remaining(fi->ds_tvb, fi->start)) {
1486         return "field length invalid!";
1487     }
1488
1489     /* Find the data for this field. */
1490     pd = get_field_data(src_list, fi);
1491
1492     if (pd) {
1493         int i;
1494         gchar* buffer;
1495         gchar* p;
1496         int len;
1497         const int chars_per_byte = 2;
1498
1499         len = chars_per_byte * fi->length;
1500         buffer = ep_alloc_array(gchar, len + 1);
1501         buffer[len] = '\0'; /* Ensure NULL termination in bad cases */
1502         p = buffer;
1503         /* Print a simple hex dump */
1504         for (i = 0 ; i < fi->length; i++) {
1505             g_snprintf(p, len, "%02x", pd[i]);
1506             p += chars_per_byte;
1507             len -= chars_per_byte;
1508         }
1509         return buffer;
1510     } else {
1511         return NULL;
1512     }
1513 }