diff options
Diffstat (limited to 'epan/disabled_protos.c')
| -rw-r--r-- | epan/disabled_protos.c | 388 |
1 files changed, 386 insertions, 2 deletions
diff --git a/epan/disabled_protos.c b/epan/disabled_protos.c index 1afe9c96db..4d30e13510 100644 --- a/epan/disabled_protos.c +++ b/epan/disabled_protos.c @@ -34,18 +34,39 @@ #include <wsutil/filesystem.h> #include <epan/proto.h> +#include <epan/packet.h> #include "disabled_protos.h" #include <wsutil/file_util.h> -#define GLOBAL_PROTOCOLS_FILE_NAME "disabled_protos" #define PROTOCOLS_FILE_NAME "disabled_protos" +#define HEURISTICS_FILE_NAME "heuristic_protos" + +/* + * Item in a list of disabled protocols. + */ +typedef struct { + char *name; /* protocol name */ +} protocol_def; + +/* + * Item in a list of heuristic dissectors and their enabled state. + */ +typedef struct { + char *name; /* heuristic short name */ + gboolean enabled; /* heuristc enabled */ +} heur_protocol_def; /* * List of disabled protocols */ static GList *global_disabled_protos = NULL; static GList *disabled_protos = NULL; +/* + * List of disabled heuristics + */ +static GList *global_disabled_heuristics = NULL; +static GList *disabled_heuristics = NULL; #define INIT_BUF_SIZE 128 @@ -68,6 +89,25 @@ discard_existing_list (GList **flp) } } +static void +heur_discard_existing_list (GList **flp) +{ + GList *fl_ent; + heur_protocol_def *prot; + + if (*flp != NULL) { + fl_ent = g_list_first(*flp); + while (fl_ent != NULL) { + prot = (heur_protocol_def *) fl_ent->data; + g_free(prot->name); + g_free(prot); + fl_ent = fl_ent->next; + } + g_list_free(*flp); + *flp = NULL; + } +} + /* * Read in a list of disabled protocols. * @@ -92,7 +132,7 @@ read_disabled_protos_list(char **gpath_return, int *gopen_errno_return, FILE *ff; /* Construct the pathname of the global disabled protocols file. */ - gff_path = get_datafile_path(GLOBAL_PROTOCOLS_FILE_NAME); + gff_path = get_datafile_path(PROTOCOLS_FILE_NAME); /* If we already have a list of protocols, discard it. */ discard_existing_list (&global_disabled_protos); @@ -258,6 +298,7 @@ read_disabled_protos_list_file(const char *ff_path, FILE *ff, return 0; error: + g_free(prot_name); return errno; } @@ -408,6 +449,349 @@ save_disabled_protos_list(char **pref_path_return, int *errno_return) g_free(ff_path); } +void +set_disabled_heur_dissector_list(void) +{ + GList *fl_ent; + heur_protocol_def *heur; + heur_dtbl_entry_t* h; + + /* + * assume all heuristics are enabled by default + */ + if (disabled_heuristics == NULL) + goto skip; + + fl_ent = g_list_first(disabled_heuristics); + + while (fl_ent != NULL) { + heur = (heur_protocol_def *) fl_ent->data; + h = find_heur_dissector_by_unique_short_name(heur->name); + if (h != NULL) { + h->enabled = heur->enabled; + } + + fl_ent = fl_ent->next; + } + +skip: + if (global_disabled_heuristics == NULL) + return; + + fl_ent = g_list_first(global_disabled_heuristics); + + while (fl_ent != NULL) { + heur = (heur_protocol_def *) fl_ent->data; + + h = find_heur_dissector_by_unique_short_name(heur->name); + if (h != NULL) { + h->enabled = heur->enabled; + } + + fl_ent = fl_ent->next; + } +} + +static int +read_disabled_heur_dissector_list_file(const char *ff_path, FILE *ff, + GList **flp) +{ + heur_protocol_def *heur; + int c; + char *heuristic_name; + int heuristic_name_len; + int name_index; + gboolean parse_enabled; + gboolean enabled; + int line = 1; + + + /* Allocate the protocol name buffer. */ + heuristic_name_len = INIT_BUF_SIZE; + heuristic_name = (char *)g_malloc(heuristic_name_len + 1); + + for (line = 1; ; line++) { + /* Lines in a disabled protocol file contain the "filter name" of + a protocol to be disabled. */ + + /* Skip over leading white space, if any. */ + while ((c = getc(ff)) != EOF && g_ascii_isspace(c)) { + if (c == '\n') { + /* Blank line. */ + continue; + } + } + + if (c == EOF) { + if (ferror(ff)) + goto error; /* I/O error */ + else + break; /* Nothing more to read */ + } + ungetc(c, ff); /* Unread the non-white-space character. */ + + /* Get the name of the protocol. */ + name_index = 0; + enabled = FALSE; + parse_enabled = FALSE; + for (;;) { + c = getc(ff); + if (c == EOF) + break; /* End of file, or I/O error */ + if (g_ascii_isspace(c)) + break; /* Trailing white space, or end of line. */ + if (c == ',') {/* Separator for enable/disable */ + parse_enabled = TRUE; + continue; + } + if (c == '#') + break; /* Start of comment, running to end of line. */ + if (parse_enabled) { + enabled = ((c == '1') ? TRUE : FALSE); + break; + } + /* Add this character to the protocol name string. */ + if (name_index >= heuristic_name_len) { + /* protocol name buffer isn't long enough; double its length. */ + heuristic_name_len *= 2; + heuristic_name = (char *)g_realloc(heuristic_name, heuristic_name_len + 1); + } + heuristic_name[name_index] = c; + name_index++; + } + + if (g_ascii_isspace(c) && c != '\n') { + /* Skip over trailing white space. */ + while ((c = getc(ff)) != EOF && c != '\n' && g_ascii_isspace(c)) + ; + if (c != EOF && c != '\n' && c != '#') { + /* Non-white-space after the protocol name; warn about it, + in case we come up with a reason to use it. */ + g_warning("'%s' line %d has extra stuff after the protocol name.", + ff_path, line); + } + } + if (c != EOF && c != '\n') { + /* Skip to end of line. */ + while ((c = getc(ff)) != EOF && c != '\n') + ; + } + + if (c == EOF) { + if (ferror(ff)) + goto error; /* I/O error */ + else { + /* EOF, not error; no newline seen before EOF */ + g_warning("'%s' line %d doesn't have a newline.", ff_path, + line); + } + break; /* nothing more to read */ + } + + /* Null-terminate the protocol name. */ + if (name_index >= heuristic_name_len) { + /* protocol name buffer isn't long enough; double its length. */ + heuristic_name_len *= 2; + heuristic_name = (char *)g_realloc(heuristic_name, heuristic_name_len + 1); + } + heuristic_name[name_index] = '\0'; + + /* Add the new protocol to the list of disabled protocols */ + heur = (heur_protocol_def *) g_malloc(sizeof(heur_protocol_def)); + heur->name = g_strdup(heuristic_name); + heur->enabled = enabled; + *flp = g_list_append(*flp, heur); + } + g_free(heuristic_name); + return 0; + +error: + g_free(heuristic_name); + return errno; +} + +void +read_disabled_heur_dissector_list(char **gpath_return, int *gopen_errno_return, + int *gread_errno_return, + char **path_return, int *open_errno_return, + int *read_errno_return) +{ + int err; + char *gff_path, *ff_path; + FILE *ff; + + /* Construct the pathname of the global disabled heuristic dissectors file. */ + gff_path = get_datafile_path(HEURISTICS_FILE_NAME); + + /* If we already have a list of protocols, discard it. */ + heur_discard_existing_list(&global_disabled_heuristics); + + /* Read the global disabled protocols file, if it exists. */ + *gpath_return = NULL; + if ((ff = ws_fopen(gff_path, "r")) != NULL) { + /* We succeeded in opening it; read it. */ + err = read_disabled_heur_dissector_list_file(gff_path, ff, + &global_disabled_heuristics); + if (err != 0) { + /* We had an error reading the file; return the errno and the + pathname, so our caller can report the error. */ + *gopen_errno_return = 0; + *gread_errno_return = err; + *gpath_return = gff_path; + } else + g_free(gff_path); + fclose(ff); + } else { + /* We failed to open it. If we failed for some reason other than + "it doesn't exist", return the errno and the pathname, so our + caller can report the error. */ + if (errno != ENOENT) { + *gopen_errno_return = errno; + *gread_errno_return = 0; + *gpath_return = gff_path; + } else + g_free(gff_path); + } + + /* Construct the pathname of the user's disabled protocols file. */ + ff_path = get_persconffile_path(HEURISTICS_FILE_NAME, TRUE); + + /* If we already have a list of protocols, discard it. */ + heur_discard_existing_list (&disabled_heuristics); + + /* Read the user's disabled protocols file, if it exists. */ + *path_return = NULL; + if ((ff = ws_fopen(ff_path, "r")) != NULL) { + /* We succeeded in opening it; read it. */ + err = read_disabled_heur_dissector_list_file(ff_path, ff, &disabled_heuristics); + if (err != 0) { + /* We had an error reading the file; return the errno and the + pathname, so our caller can report the error. */ + *open_errno_return = 0; + *read_errno_return = err; + *path_return = ff_path; + } else + g_free(ff_path); + fclose(ff); + } else { + /* We failed to open it. If we failed for some reason other than + "it doesn't exist", return the errno and the pathname, so our + caller can report the error. */ + if (errno != ENOENT) { + *open_errno_return = errno; + *read_errno_return = 0; + *path_return = ff_path; + } else + g_free(ff_path); + } +} + +static gint +heur_compare(gconstpointer a, gconstpointer b) +{ + return strcmp(((heur_dtbl_entry_t*)a)->short_name, + ((heur_dtbl_entry_t*)b)->short_name); +} + +static void +write_heur_dissector(gpointer data, gpointer user_data) +{ + heur_dtbl_entry_t* dtbl_entry = (heur_dtbl_entry_t*)data; + FILE *ff = (FILE*)user_data; + + /* Write out the heuristic short name and its enabled state */ + fprintf(ff, "%s,%d\n", dtbl_entry->short_name, dtbl_entry->enabled ? 1 : 0); +} + +static void +sort_dissector_table_entries(const char *table_name _U_, + heur_dtbl_entry_t *dtbl_entry, gpointer user_data) +{ + GSList **list = (GSList**)user_data; + *list = g_slist_insert_sorted(*list, dtbl_entry, heur_compare); +} + +static void +sort_heur_dissector_tables(const char *table_name, heur_dissector_list_t *list, gpointer w) +{ + if (list) { + heur_dissector_table_foreach(table_name, sort_dissector_table_entries, w); + } +} + +WS_DLL_PUBLIC void +save_disabled_heur_dissector_list(char **pref_path_return, int *errno_return) +{ + gchar *ff_path, *ff_path_new; + GSList *sorted_heur_list = NULL; + FILE *ff; + + *pref_path_return = NULL; /* assume no error */ + + ff_path = get_persconffile_path(HEURISTICS_FILE_NAME, TRUE); + + /* Write to "XXX.new", and rename if that succeeds. + That means we don't trash the file if we fail to write it out + completely. */ + ff_path_new = g_strdup_printf("%s.new", ff_path); + + if ((ff = ws_fopen(ff_path_new, "w")) == NULL) { + *pref_path_return = ff_path; + *errno_return = errno; + g_free(ff_path_new); + return; + } + + /* Iterate over all the heuristic dissectors to sort them in alphabetical order by short name */ + dissector_all_heur_tables_foreach_table(sort_heur_dissector_tables, &sorted_heur_list, NULL); + + /* Write the list */ + g_slist_foreach(sorted_heur_list, write_heur_dissector, ff); + g_slist_free(sorted_heur_list); + + if (fclose(ff) == EOF) { + *pref_path_return = ff_path; + *errno_return = errno; + ws_unlink(ff_path_new); + g_free(ff_path_new); + return; + } + +#ifdef _WIN32 + /* ANSI C doesn't say whether "rename()" removes the target if it + exists; the Win32 call to rename files doesn't do so, which I + infer is the reason why the MSVC++ "rename()" doesn't do so. + We must therefore remove the target file first, on Windows. + + XXX - ws_rename() should be ws_stdio_rename() on Windows, + and ws_stdio_rename() uses MoveFileEx() with MOVEFILE_REPLACE_EXISTING, + so it should remove the target if it exists, so this stuff + shouldn't be necessary. Perhaps it dates back to when we were + calling rename(), with that being a wrapper around Microsoft's + _rename(), which didn't remove the target. */ + if (ws_remove(ff_path) < 0 && errno != ENOENT) { + /* It failed for some reason other than "it's not there"; if + it's not there, we don't need to remove it, so we just + drive on. */ + *pref_path_return = ff_path; + *errno_return = errno; + ws_unlink(ff_path_new); + g_free(ff_path_new); + return; + } +#endif + + if (ws_rename(ff_path_new, ff_path) < 0) { + *pref_path_return = ff_path; + *errno_return = errno; + ws_unlink(ff_path_new); + g_free(ff_path_new); + return; + } + g_free(ff_path_new); + g_free(ff_path); +} + /* * Editor modelines - http://www.wireshark.org/tools/modelines.html * |