/* export_object.c

 * GUI independent helper routines common to all export object taps.

 *

 * Wireshark - Network traffic analyzer

 * By Gerald Combs <gerald@wireshark.org>

 * Copyright 1998 Gerald Combs

 *

 * SPDX-License-Identifier: GPL-2.0-or-later

 */

#include "config.h"

#include <string.h>

#include "proto.h"

#include "packet_info.h"

#include "export_object.h"

struct register_eo {

    int proto_id;                        /* protocol id (0-indexed) */

    const char* tap_listen_str;          /* string used in register_tap_listener (NULL to use protocol name) */

    tap_packet_cb eo_func;               /* function to be called for new incoming packets for SRT */

    export_object_gui_reset_cb reset_cb; /* function to parse parameters of optional arguments of tap string */

};

static wmem_tree_t *registered_eo_tables;

int

register_export_object(const int proto_id, tap_packet_cb export_packet_func, export_object_gui_reset_cb reset_cb)

{

    register_eo_t *table;

    DISSECTOR_ASSERT(export_packet_func);

    table = wmem_new(wmem_epan_scope(), register_eo_t);

    table->proto_id      = proto_id;

    table->tap_listen_str = wmem_strdup_printf(wmem_epan_scope(), "%s_eo", proto_get_protocol_filter_name(proto_id));

    table->eo_func = export_packet_func;

    table->reset_cb = reset_cb;

    if (registered_eo_tables == NULL)

        registered_eo_tables = wmem_tree_new(wmem_epan_scope());

    wmem_tree_insert_string(registered_eo_tables, proto_get_protocol_filter_name(proto_id), table, 0);

    return register_tap(table->tap_listen_str);

}

int get_eo_proto_id(register_eo_t* eo)

{

    if (!eo) {

        return -1;

    }

    return eo->proto_id;

}

const char* get_eo_tap_listener_name(register_eo_t* eo)

{

    return eo->tap_listen_str;

}

tap_packet_cb get_eo_packet_func(register_eo_t* eo)

{

    return eo->eo_func;

}

export_object_gui_reset_cb get_eo_reset_func(register_eo_t* eo)

{

    return eo->reset_cb;

}

register_eo_t* get_eo_by_name(const char* name)

{

    return (register_eo_t*)wmem_tree_lookup_string(registered_eo_tables, name, 0);

}

void eo_iterate_tables(wmem_foreach_func func, void *user_data)

{

    wmem_tree_foreach(registered_eo_tables, func, user_data);

}

static GString *eo_rename(GString *gstr, size_t maxlen, int dupn)

{

    GString *gstr_tmp;

    char *tmp_ptr;

    GString *ext_str = NULL;

    gstr_tmp = g_string_new("");

    if (dupn != 0) {

        g_string_append_printf (gstr_tmp, "(%d)", dupn);

    }

    if ( (tmp_ptr = strrchr(gstr->str, '.')) != NULL && ((ext_str = g_string_new(tmp_ptr))->len + strlen(gstr_tmp->str) < maxlen) ) {

        /* Retain the extension */

        gstr = g_string_truncate(gstr, gstr->len - ext_str->len);

        if ( gstr->len >= (maxlen - (strlen(gstr_tmp->str) + ext_str->len)) )

            gstr = g_string_truncate(gstr, maxlen - (strlen(gstr_tmp->str) + ext_str->len));

        gstr = g_string_append(gstr, gstr_tmp->str);

        gstr = g_string_append(gstr, ext_str->str);

    }

    else {

        if ( gstr->len >= (maxlen - strlen(gstr_tmp->str)) )

            gstr = g_string_truncate(gstr, maxlen - strlen(gstr_tmp->str));

        gstr = g_string_append(gstr, gstr_tmp->str);

    }

    if (ext_str) {

        g_string_free(ext_str, TRUE);

    }

    g_string_free(gstr_tmp, TRUE);

    return gstr;

}

GString *

eo_massage_str(const char *in_str, size_t maxlen, int dupn)

{

    char *tmp_ptr;

    /* The characters in "reject" come from:

     * https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#naming-conventions.

     * Add to the list as necessary for other OS's.

     */

    const char *reject = "<>:\"/\\|?*"

        "\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a"

    "\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14"

    "\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f";

    GString *out_str;

    out_str = g_string_new("");

    /* Find all disallowed characters/bytes and replace them with %xx */

    while ( (tmp_ptr = strpbrk(in_str, reject)) != NULL ) {

        out_str = g_string_append_len(out_str, in_str, tmp_ptr - in_str);

        g_string_append_printf(out_str, "%%%02x", *tmp_ptr);

        in_str = tmp_ptr + 1;

    }

    out_str = g_string_append(out_str, in_str);

    if ( dupn != 0 || out_str->len > maxlen )

        out_str = eo_rename(out_str, maxlen, dupn);

    return out_str;

}

const char *

eo_ct2ext(const char *content_type)

{

    /* TODO: Map the content type string to an extension string.  If no match,

     * return NULL. */

    return content_type;

}

void eo_free_entry(export_object_entry_t *entry)

{

    g_free(entry->hostname);

    g_free(entry->content_type);

    g_free(entry->filename);

    g_free(entry->payload_data);

    g_free(entry);

}

/*

 * Editor modelines

 *

 * Local Variables:

 * c-basic-offset: 4

 * tab-width: 8

 * indent-tabs-mode: nil

 * End:

 *

 * ex: set shiftwidth=4 tabstop=8 expandtab:

 * :indentSize=4:tabSize=8:noTabs=true:

 */