extcap_parser.c

   1 /* extcap_parser.c
   2  *
   3  * Routines for extcap external capture
   4  * Copyright 2013, Mike Ryan <mikeryan@lacklustre.net>
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 #include <config.h>
  26
  27 #include <stdio.h>
  28 #include <glib.h>
  29 #include <string.h>
  30
  31 #include "extcap.h"
  32 #include "extcap_parser.h"
  33
  34 void extcap_printf_complex(extcap_complex *comp) {
  35     gchar *ret = extcap_get_complex_as_string(comp);
  36     printf("%s", ret);
  37     g_free(ret);
  38 }
  39
  40 gchar *extcap_get_complex_as_string(extcap_complex *comp) {
  41     return (comp ? g_strdup(comp->_val) : NULL);
  42 }
  43
  44 extcap_complex *extcap_parse_complex(extcap_arg_type complex_type,
  45                                      const gchar *data) {
  46
  47     extcap_complex *rc = g_new0(extcap_complex, 1);
  48
  49     rc->_val = g_strdup(data);
  50     rc->complex_type = complex_type;
  51
  52     return rc;
  53 }
  54
  55 gboolean extcap_compare_is_default(extcap_arg *element, extcap_complex *test) {
  56     if (element == NULL || element->default_complex == NULL || test == NULL)
  57         return FALSE;
  58
  59     if (g_strcmp0(element->default_complex->_val, test->_val) == 0)
  60         return TRUE;
  61
  62     return FALSE;
  63 }
  64
  65 void extcap_free_complex(extcap_complex *comp) {
  66     if (comp)
  67         g_free(comp->_val);
  68     g_free(comp);
  69 }
  70
  71 gint extcap_complex_get_int(extcap_complex *comp) {
  72     if (comp == NULL || comp->_val == NULL || comp->complex_type != EXTCAP_ARG_INTEGER)
  73         return (gint)0;
  74
  75     return (gint) g_ascii_strtoll(comp->_val, NULL, 10);
  76 }
  77
  78 guint extcap_complex_get_uint(extcap_complex *comp) {
  79     if (comp == NULL || comp->_val == NULL || comp->complex_type != EXTCAP_ARG_UNSIGNED)
  80         return (guint)0;
  81     return (guint) g_ascii_strtoull(comp->_val, NULL, 10);
  82 }
  83
  84 gint64 extcap_complex_get_long(extcap_complex *comp) {
  85     if (comp == NULL || comp->_val == NULL || comp->complex_type != EXTCAP_ARG_LONG)
  86         return (gint64)0;
  87     return g_ascii_strtoll(comp->_val, NULL, 10);
  88 }
  89
  90 gdouble extcap_complex_get_double(extcap_complex *comp) {
  91     if (comp == NULL || comp->_val == NULL || comp->complex_type != EXTCAP_ARG_DOUBLE)
  92         return (gdouble)0;
  93     return g_strtod(comp->_val, NULL);
  94 }
  95
  96 gboolean extcap_complex_get_bool(extcap_complex *comp) {
  97     if (comp == NULL || comp->_val == NULL)
  98         return FALSE;
  99
 100     if (comp->complex_type != EXTCAP_ARG_BOOLEAN && comp->complex_type != EXTCAP_ARG_BOOLFLAG)
 101         return FALSE;
 102
 103     return g_regex_match_simple(EXTCAP_BOOLEAN_REGEX, comp->_val, G_REGEX_CASELESS, (GRegexMatchFlags)0);
 104 }
 105
 106 gchar *extcap_complex_get_string(extcap_complex *comp) {
 107     /* Not checking for argument type, to use this method as fallback if only strings are needed */
 108     return comp != NULL ? comp->_val : NULL;
 109 }
 110
 111 static extcap_token_sentence *extcap_tokenize_sentence(const gchar *s) {
 112     GRegex *regex = NULL;
 113     GMatchInfo *match_info = NULL;
 114     GError *error = NULL;
 115     gchar *param_value = NULL;
 116     guint param_type = EXTCAP_PARAM_UNKNOWN;
 117
 118     extcap_token_sentence *rs = g_new0(extcap_token_sentence, 1);
 119
 120     rs->sentence = NULL;
 121
 122     /* Regex for catching just the allowed values for sentences */
 123     if ((regex = g_regex_new("^[\\t| ]*(arg|value|interface|extcap|dlt)(?=[\\t| ]+\\{)",
 124                              (GRegexCompileFlags) G_REGEX_CASELESS, (GRegexMatchFlags) 0, NULL)) != NULL) {
 125         g_regex_match(regex, s, (GRegexMatchFlags) 0, &match_info);
 126
 127         if (g_match_info_matches(match_info))
 128             rs->sentence = g_match_info_fetch(match_info, 0);
 129
 130         g_match_info_free(match_info);
 131         g_regex_unref(regex);
 132     }
 133     /* No valid sentence found, exiting here */
 134     if (rs->sentence == NULL) {
 135         g_free(rs);
 136         return NULL;
 137     }
 138
 139     rs->param_list = g_hash_table_new_full(g_direct_hash, g_direct_equal, NULL, g_free);
 140
 141     /* Capture the argument and the value of the list. This will ensure,
 142      * that regex patterns given to {validation=} are parsed correctly,
 143      * as long as }{ does not occur within the pattern */
 144     regex = g_regex_new("\\{([a-zA-Z_-]*?)\\=(.*?)\\}(?=\\{|$|\\s)",
 145                         (GRegexCompileFlags) G_REGEX_CASELESS, (GRegexMatchFlags) 0, NULL);
 146     if (regex != NULL) {
 147         g_regex_match_full(regex, s, -1, 0, (GRegexMatchFlags) 0, &match_info, &error);
 148         while (g_match_info_matches(match_info)) {
 149             gchar *arg = g_match_info_fetch(match_info, 1);
 150
 151             if (arg == NULL)
 152                 break;
 153
 154             param_value = g_match_info_fetch(match_info, 2);
 155
 156             if (g_ascii_strcasecmp(arg, "number") == 0) {
 157                 param_type = EXTCAP_PARAM_ARGNUM;
 158             } else if (g_ascii_strcasecmp(arg, "call") == 0) {
 159                 param_type = EXTCAP_PARAM_CALL;
 160             } else if (g_ascii_strcasecmp(arg, "display") == 0) {
 161                 param_type = EXTCAP_PARAM_DISPLAY;
 162             } else if (g_ascii_strcasecmp(arg, "type") == 0) {
 163                 param_type = EXTCAP_PARAM_TYPE;
 164             } else if (g_ascii_strcasecmp(arg, "arg") == 0) {
 165                 param_type = EXTCAP_PARAM_ARG;
 166             } else if (g_ascii_strcasecmp(arg, "default") == 0) {
 167                 param_type = EXTCAP_PARAM_DEFAULT;
 168             } else if (g_ascii_strcasecmp(arg, "value") == 0) {
 169                 param_type = EXTCAP_PARAM_VALUE;
 170             } else if (g_ascii_strcasecmp(arg, "range") == 0) {
 171                 param_type = EXTCAP_PARAM_RANGE;
 172             } else if (g_ascii_strcasecmp(arg, "tooltip") == 0) {
 173                 param_type = EXTCAP_PARAM_TOOLTIP;
 174             } else if (g_ascii_strcasecmp(arg, "mustexist") == 0) {
 175                 param_type = EXTCAP_PARAM_FILE_MUSTEXIST;
 176             } else if (g_ascii_strcasecmp(arg, "fileext") == 0) {
 177                 param_type = EXTCAP_PARAM_FILE_EXTENSION;
 178             } else if (g_ascii_strcasecmp(arg, "name") == 0) {
 179                 param_type = EXTCAP_PARAM_NAME;
 180             } else if (g_ascii_strcasecmp(arg, "enabled") == 0) {
 181                 param_type = EXTCAP_PARAM_ENABLED;
 182             } else if (g_ascii_strcasecmp(arg, "parent") == 0) {
 183                 param_type = EXTCAP_PARAM_PARENT;
 184             } else if (g_ascii_strcasecmp(arg, "required") == 0) {
 185                 param_type = EXTCAP_PARAM_REQUIRED;
 186             } else if (g_ascii_strcasecmp(arg, "save") == 0) {
 187                 param_type = EXTCAP_PARAM_SAVE;
 188             } else if (g_ascii_strcasecmp(arg, "validation") == 0) {
 189                 param_type = EXTCAP_PARAM_VALIDATION;
 190             } else if (g_ascii_strcasecmp(arg, "version") == 0) {
 191                 param_type = EXTCAP_PARAM_VERSION;
 192             } else if (g_ascii_strcasecmp(arg, "help") == 0) {
 193                 param_type = EXTCAP_PARAM_HELP;
 194             } else {
 195                 param_type = EXTCAP_PARAM_UNKNOWN;
 196             }
 197
 198             g_hash_table_insert(rs->param_list, ENUM_KEY(param_type), param_value);
 199
 200             g_match_info_next(match_info, &error);
 201             g_free(arg);
 202         }
 203         g_match_info_free(match_info);
 204         g_regex_unref(regex);
 205     }
 206
 207     return rs;
 208 }
 209
 210 static GList *extcap_tokenize_sentences(const gchar *s) {
 211
 212     GList *sentences = NULL;
 213     extcap_token_sentence *item = NULL;
 214     gchar **list, **list_iter;
 215
 216     list_iter = list = g_strsplit(s, "\n", 0);
 217     while (*list_iter != NULL) {
 218         item = extcap_tokenize_sentence(*list_iter);
 219         if (item)
 220             sentences = g_list_append(sentences, item);
 221         list_iter++;
 222     }
 223
 224     g_strfreev(list);
 225
 226     return sentences;
 227 }
 228
 229 static void extcap_free_value(extcap_value *v) {
 230     if (v == NULL)
 231         return;
 232
 233     g_free(v->call);
 234     g_free(v->display);
 235
 236     g_free(v);
 237 }
 238
 239 static void extcap_free_valuelist(gpointer data, gpointer user_data _U_) {
 240     extcap_free_value((extcap_value *) data);
 241 }
 242
 243 void extcap_free_arg(extcap_arg *a) {
 244
 245     if (a == NULL)
 246         return;
 247
 248     g_free(a->call);
 249     g_free(a->display);
 250     g_free(a->tooltip);
 251     g_free(a->fileextension);
 252     g_free(a->regexp);
 253     g_free(a->device_name);
 254
 255     if (a->range_start != NULL)
 256         extcap_free_complex(a->range_start);
 257
 258     if (a->range_end != NULL)
 259         extcap_free_complex(a->range_end);
 260
 261     if (a->default_complex != NULL)
 262         extcap_free_complex(a->default_complex);
 263
 264     g_list_foreach(a->values, (GFunc) extcap_free_valuelist, NULL);
 265     g_list_free(a->values);
 266     g_free(a);
 267 }
 268
 269 void extcap_free_arg_list(GList *a) {
 270     g_list_foreach(a, (GFunc)extcap_free_arg, NULL);
 271     g_list_free(a);
 272 }
 273
 274 static gint glist_find_numbered_arg(gconstpointer listelem, gconstpointer needle) {
 275     if (((const extcap_arg *) listelem)->arg_num == *((const int *) needle))
 276         return 0;
 277     return 1;
 278 }
 279
 280 static void extcap_free_tokenized_sentence(gpointer s, gpointer user_data _U_) {
 281     extcap_token_sentence *t = (extcap_token_sentence *)s;
 282
 283     if (t == NULL)
 284         return;
 285
 286     g_free(t->sentence);
 287     g_hash_table_destroy(t->param_list);
 288     g_free(t);
 289 }
 290
 291 static void extcap_free_tokenized_sentences(GList *sentences) {
 292     if (sentences == NULL)
 293         return;
 294
 295     g_list_foreach(sentences, extcap_free_tokenized_sentence, NULL);
 296     g_list_free(sentences);
 297 }
 298
 299 static extcap_arg *extcap_parse_arg_sentence(GList *args, extcap_token_sentence *s) {
 300     gchar *param_value = NULL;
 301
 302     extcap_arg *target_arg = NULL;
 303     extcap_value *value = NULL;
 304     GList *entry = NULL;
 305     int tint;
 306     extcap_sentence_type sent = EXTCAP_SENTENCE_UNKNOWN;
 307
 308     if (s == NULL)
 309         return target_arg;
 310
 311     if (g_ascii_strcasecmp(s->sentence, "arg") == 0) {
 312         sent = EXTCAP_SENTENCE_ARG;
 313         /* printf("ARG sentence\n"); */
 314     } else if (g_ascii_strcasecmp(s->sentence, "value") == 0) {
 315         sent = EXTCAP_SENTENCE_VALUE;
 316         /* printf("VALUE sentence\n"); */
 317     }
 318
 319     if (sent == EXTCAP_SENTENCE_ARG) {
 320         target_arg = g_new0(extcap_arg, 1);
 321         target_arg->arg_type = EXTCAP_ARG_UNKNOWN;
 322         target_arg->save = TRUE;
 323
 324
 325         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_ARGNUM))) == NULL) {
 326             extcap_free_arg(target_arg);
 327             return NULL;
 328         }
 329
 330         if (sscanf(param_value, "%d", &(target_arg->arg_num)) != 1) {
 331             extcap_free_arg(target_arg);
 332             return NULL;
 333         }
 334
 335         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_CALL))) == NULL) {
 336             extcap_free_arg(target_arg);
 337             return NULL;
 338         }
 339         target_arg->call = g_strdup(param_value);
 340
 341         /* No value only parameters allowed */
 342         if (strlen(target_arg->call) == 0) {
 343             extcap_free_arg(target_arg);
 344             return NULL;
 345         }
 346
 347         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_DISPLAY))) == NULL) {
 348             extcap_free_arg(target_arg);
 349             return NULL;
 350         }
 351         target_arg->display = g_strdup(param_value);
 352
 353         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_TOOLTIP)))
 354                 != NULL) {
 355             target_arg->tooltip = g_strdup(param_value);
 356         }
 357
 358         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_FILE_MUSTEXIST)))
 359                 != NULL) {
 360             target_arg->fileexists = g_regex_match_simple(EXTCAP_BOOLEAN_REGEX, param_value, G_REGEX_CASELESS, (GRegexMatchFlags)0);
 361         }
 362
 363         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_FILE_EXTENSION)))
 364                 != NULL) {
 365             target_arg->fileextension = g_strdup(param_value);
 366         }
 367
 368         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_VALIDATION)))
 369                 != NULL) {
 370             target_arg->regexp = g_strdup(param_value);
 371         }
 372
 373         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_REQUIRED)))
 374                 != NULL) {
 375             target_arg->is_required = g_regex_match_simple(EXTCAP_BOOLEAN_REGEX, param_value, G_REGEX_CASELESS, (GRegexMatchFlags)0);
 376         }
 377
 378         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_TYPE)))
 379                 == NULL) {
 380             /* printf("no type in ARG sentence\n"); */
 381             extcap_free_arg(target_arg);
 382             return NULL;
 383         }
 384
 385         if (g_ascii_strcasecmp(param_value, "integer") == 0) {
 386             target_arg->arg_type = EXTCAP_ARG_INTEGER;
 387         } else if (g_ascii_strcasecmp(param_value, "unsigned") == 0) {
 388             target_arg->arg_type = EXTCAP_ARG_UNSIGNED;
 389         } else if (g_ascii_strcasecmp(param_value, "long") == 0) {
 390             target_arg->arg_type = EXTCAP_ARG_LONG;
 391         } else if (g_ascii_strcasecmp(param_value, "double") == 0) {
 392             target_arg->arg_type = EXTCAP_ARG_DOUBLE;
 393         } else if (g_ascii_strcasecmp(param_value, "boolean") == 0) {
 394             target_arg->arg_type = EXTCAP_ARG_BOOLEAN;
 395         } else if (g_ascii_strcasecmp(param_value, "boolflag") == 0) {
 396             target_arg->arg_type = EXTCAP_ARG_BOOLFLAG;
 397         } else if (g_ascii_strcasecmp(param_value, "selector") == 0) {
 398             target_arg->arg_type = EXTCAP_ARG_SELECTOR;
 399         } else if (g_ascii_strcasecmp(param_value, "radio") == 0) {
 400             target_arg->arg_type = EXTCAP_ARG_RADIO;
 401         } else if (g_ascii_strcasecmp(param_value, "string") == 0) {
 402             target_arg->arg_type = EXTCAP_ARG_STRING;
 403         } else if (g_ascii_strcasecmp(param_value, "password") == 0) {
 404             target_arg->arg_type = EXTCAP_ARG_PASSWORD;
 405             /* default setting is to not save passwords */
 406             target_arg->save = FALSE;
 407         } else if (g_ascii_strcasecmp(param_value, "fileselect") == 0) {
 408             target_arg->arg_type = EXTCAP_ARG_FILESELECT;
 409         } else if (g_ascii_strcasecmp(param_value, "multicheck") == 0) {
 410             target_arg->arg_type = EXTCAP_ARG_MULTICHECK;
 411         } else if (g_ascii_strcasecmp(param_value, "timestamp") == 0) {
 412             target_arg->arg_type = EXTCAP_ARG_TIMESTAMP;
 413         } else {
 414             printf("invalid type %s in ARG sentence\n", param_value);
 415             extcap_free_arg(target_arg);
 416             return NULL;
 417         }
 418
 419         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_SAVE)))
 420                 != NULL) {
 421             target_arg->save = g_regex_match_simple(EXTCAP_BOOLEAN_REGEX, param_value, G_REGEX_CASELESS, (GRegexMatchFlags)0);
 422         }
 423
 424         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_RANGE)))
 425                 != NULL) {
 426             gchar *cp = g_strstr_len(param_value, -1, ",");
 427
 428             if (cp == NULL) {
 429                 printf("invalid range, expected value,value got %s\n",
 430                        param_value);
 431                 extcap_free_arg(target_arg);
 432                 return NULL;
 433             }
 434
 435             if ((target_arg->range_start = extcap_parse_complex(
 436                                                target_arg->arg_type, param_value)) == NULL) {
 437                 printf("invalid range, expected value,value got %s\n",
 438                        param_value);
 439                 extcap_free_arg(target_arg);
 440                 return NULL;
 441             }
 442
 443             if ((target_arg->range_end = extcap_parse_complex(
 444                                              target_arg->arg_type, cp + 1)) == NULL) {
 445                 printf("invalid range, expected value,value got %s\n",
 446                        param_value);
 447                 extcap_free_arg(target_arg);
 448                 return NULL;
 449             }
 450         }
 451
 452         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_DEFAULT)))
 453                 != NULL) {
 454             if (target_arg->arg_type != EXTCAP_ARG_MULTICHECK && target_arg->arg_type != EXTCAP_ARG_SELECTOR)
 455             {
 456                 if ((target_arg->default_complex = extcap_parse_complex(
 457                                                        target_arg->arg_type, param_value)) == NULL) {
 458                     printf("invalid default, couldn't parse %s\n", param_value);
 459                 }
 460             }
 461         }
 462
 463     } else if (sent == EXTCAP_SENTENCE_VALUE) {
 464         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_ARG)))
 465                 == NULL) {
 466             printf("no arg in VALUE sentence\n");
 467             return NULL;
 468         }
 469
 470         if (sscanf(param_value, "%d", &tint) != 1) {
 471             printf("invalid arg in VALUE sentence\n");
 472             return NULL;
 473         }
 474
 475         if ((entry = g_list_find_custom(args, &tint, glist_find_numbered_arg))
 476                 == NULL) {
 477             printf("couldn't find arg %d in list for VALUE sentence\n", tint);
 478             return NULL;
 479         }
 480
 481         value = g_new0(extcap_value, 1);
 482         value->arg_num = tint;
 483
 484         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_VALUE)))
 485                 == NULL) {
 486             /* printf("no value in VALUE sentence\n"); */
 487             extcap_free_value(value);
 488             return NULL;
 489         }
 490         value->call = g_strdup(param_value);
 491
 492         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_DISPLAY)))
 493                 == NULL) {
 494             /* printf("no display in VALUE sentence\n"); */
 495             extcap_free_value(value);
 496             return NULL;
 497         }
 498         value->display = g_strdup(param_value);
 499
 500         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_PARENT)))
 501                 != NULL) {
 502             value->parent = g_strdup(param_value);
 503         }
 504
 505         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_DEFAULT)))
 506                 != NULL) {
 507             /* printf("found default value\n"); */
 508             value->is_default = g_regex_match_simple(EXTCAP_BOOLEAN_REGEX, param_value, G_REGEX_CASELESS, (GRegexMatchFlags)0);
 509         }
 510
 511         if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_ENABLED)))
 512                 != NULL) {
 513             value->enabled = g_regex_match_simple(EXTCAP_BOOLEAN_REGEX, param_value, G_REGEX_CASELESS, (GRegexMatchFlags)0);
 514         }
 515
 516         ((extcap_arg *) entry->data)->values = g_list_append(
 517                 ((extcap_arg *) entry->data)->values, value);
 518
 519         return NULL;
 520     }
 521
 522     return target_arg;
 523 }
 524
 525 GList *extcap_parse_args(gchar *output) {
 526     GList *result = NULL;
 527     GList *walker = NULL;
 528     GList *temp = NULL;
 529
 530     walker = extcap_tokenize_sentences(output);
 531     temp = walker;
 532
 533     while (walker) {
 534         extcap_arg *ra = NULL;
 535         extcap_token_sentence *sentence = (extcap_token_sentence *)walker->data;
 536
 537         if ((ra = extcap_parse_arg_sentence(result, sentence)) != NULL)
 538             result = g_list_append(result, (gpointer) ra);
 539
 540         walker = g_list_next(walker);
 541     }
 542
 543     extcap_free_tokenized_sentences(temp);
 544
 545     return result;
 546 }
 547
 548 static extcap_interface *extcap_parse_interface_sentence(extcap_token_sentence *s) {
 549     extcap_sentence_type sent = EXTCAP_SENTENCE_UNKNOWN;
 550     gchar *param_value = NULL;
 551     extcap_interface *ri = NULL;
 552
 553     if (s == NULL)
 554         return NULL;
 555
 556     if (g_ascii_strcasecmp(s->sentence, "interface") == 0) {
 557         sent = EXTCAP_SENTENCE_INTERFACE;
 558     } else if (g_ascii_strcasecmp(s->sentence, "extcap") == 0) {
 559         sent = EXTCAP_SENTENCE_EXTCAP;
 560     }
 561
 562     if (sent == EXTCAP_SENTENCE_UNKNOWN)
 563         return NULL;
 564
 565     ri = g_new0(extcap_interface, 1);
 566
 567     ri->if_type = sent;
 568
 569     if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_VALUE)))
 570             == NULL && sent == EXTCAP_SENTENCE_INTERFACE) {
 571         printf("No value in INTERFACE sentence\n");
 572         g_free(ri);
 573         return NULL;
 574     }
 575     ri->call = g_strdup(param_value);
 576
 577     if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_DISPLAY)))
 578             == NULL && sent == EXTCAP_SENTENCE_INTERFACE) {
 579         printf("No display in INTERFACE sentence\n");
 580         g_free(ri->call);
 581         g_free(ri);
 582         return NULL;
 583     }
 584     ri->display = g_strdup(param_value);
 585
 586     if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_VERSION)))
 587             != NULL) {
 588         ri->version = g_strdup(param_value);
 589     }
 590
 591     if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_HELP)))
 592             != NULL) {
 593         ri->help = g_strdup(param_value);
 594     }
 595
 596     return ri;
 597 }
 598
 599 GList *extcap_parse_interfaces(gchar *output) {
 600
 601     GList *result = NULL;
 602     GList *tokens = NULL;
 603     GList *walker = extcap_tokenize_sentences(output);
 604     tokens = walker;
 605
 606     while (walker) {
 607         extcap_interface *ri = NULL;
 608         extcap_token_sentence *if_sentence = (extcap_token_sentence *) walker->data;
 609
 610         if (if_sentence != NULL && (ri = extcap_parse_interface_sentence(if_sentence)) != NULL)
 611             result = g_list_append(result, ri);
 612
 613         walker = g_list_next(walker);
 614     }
 615
 616     extcap_free_tokenized_sentences(tokens);
 617
 618     return result;
 619 }
 620
 621 /* Parse a tokenized set of sentences and validate, looking for DLT definitions */
 622 static extcap_dlt *extcap_parse_dlt_sentence(extcap_token_sentence *s) {
 623     gchar *param_value = NULL;
 624     extcap_sentence_type sent = EXTCAP_SENTENCE_UNKNOWN;
 625     extcap_dlt *result = NULL;
 626
 627     if (s == NULL)
 628         return result;
 629
 630     if (g_ascii_strcasecmp(s->sentence, "dlt") == 0) {
 631         sent = EXTCAP_SENTENCE_DLT;
 632     }
 633
 634     if (sent == EXTCAP_SENTENCE_UNKNOWN)
 635         return result;
 636
 637     result = g_new0(extcap_dlt, 1);
 638
 639     result->number = -1;
 640     result->name = NULL;
 641     result->display = NULL;
 642
 643     if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_ARGNUM)))
 644             == NULL) {
 645         printf("No number in DLT sentence\n");
 646         g_free(result);
 647         return NULL;
 648     }
 649     if (sscanf(param_value, "%d", &(result->number)) != 1) {
 650         printf("Invalid number in DLT sentence\n");
 651         g_free(result);
 652         return NULL;
 653     }
 654
 655     if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_NAME)))
 656             == NULL) {
 657         printf("No name in DLT sentence\n");
 658         g_free(result);
 659         return NULL;
 660     }
 661     result->name = g_strdup(param_value);
 662
 663     if ((param_value = (gchar *)g_hash_table_lookup(s->param_list, ENUM_KEY(EXTCAP_PARAM_DISPLAY)))
 664             == NULL) {
 665         printf("No display in DLT sentence\n");
 666         g_free(result->name);
 667         g_free(result);
 668         return NULL;
 669     }
 670     result->display = g_strdup(param_value);
 671
 672     return result;
 673 }
 674
 675 GList *extcap_parse_dlts(gchar *output) {
 676
 677     GList *walker = NULL;
 678     GList *temp = NULL;
 679     GList *result = NULL;
 680
 681     walker = extcap_tokenize_sentences(output);
 682
 683     temp = walker;
 684
 685     while (walker) {
 686         extcap_dlt *data = NULL;
 687
 688         if ((data = extcap_parse_dlt_sentence((extcap_token_sentence *)walker->data)) != NULL)
 689             result = g_list_append(result, data);
 690
 691         walker = g_list_next(walker);
 692     }
 693
 694     extcap_free_tokenized_sentences(temp);
 695
 696     return result;
 697 }
 698
 699 /*
 700  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 701  *
 702  * Local variables:
 703  * c-basic-offset: 4
 704  * tab-width: 8
 705  * indent-tabs-mode: nil
 706  * End:
 707  *
 708  * vi: set shiftwidth=4 tabstop=8 expandtab:
 709  * :indentSize=4:tabSize=8:noTabs=true:
 710  */