299 lines
8.5 KiB
C
299 lines
8.5 KiB
C
/* tap-diameter-avp.c
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* Copyright 2010 Andrej Kuehnal <andrejk@freenet.de>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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/*
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* This TAP enables extraction of most important diameter fields in text format.
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* - much more performance than -T text and -T pdml
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* - more powerful than -T field and -z proto,colinfo
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* - exacltly one text line per diameter message
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* - multiple diameter messages in one frame supported
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* E.g. one device watchdog answer and two credit control answers
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* in one TCP packet produces 3 text lines.
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* - several fields with same name within one diameter message supported
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* E.g. Multiple AVP(444) Subscription-Id-Data once with IMSI once with MSISDN
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* - several grouped AVPs supported
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* E.g. Zero or more Multiple-Services-Credit-Control AVPs(456)
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.h>
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#include <wsutil/strtoi.h>
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#include <wsutil/cmdarg_err.h>
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#include <epan/packet_info.h>
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#include <epan/tap.h>
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#include <epan/epan_dissect.h>
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#include <epan/stat_tap_ui.h>
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#include <epan/value_string.h>
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#include <epan/to_str.h>
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#include <epan/dissectors/packet-diameter.h>
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void register_tap_listener_diameteravp(void);
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/* used to keep track of the statistics for an entire program interface */
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typedef struct _diameteravp_t {
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guint32 frame;
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guint32 diammsg_toprocess;
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guint32 cmd_code;
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guint32 req_count;
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guint32 ans_count;
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guint32 paired_ans_count;
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gchar *filter;
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} diameteravp_t;
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/* Copied from proto.c */
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static gboolean
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tree_traverse_pre_order(proto_tree *tree, proto_tree_traverse_func func, gpointer data)
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{
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proto_node *pnode = tree;
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proto_node *child;
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proto_node *current;
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if (func(pnode, data))
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return TRUE;
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child = pnode->first_child;
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while (child != NULL) {
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current = child;
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child = current->next;
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if (tree_traverse_pre_order((proto_tree *)current, func, data))
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return TRUE;
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}
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return FALSE;
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}
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static gboolean
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diam_tree_to_csv(proto_node *node, gpointer data)
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{
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char *val_str = NULL;
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char *val_tmp = NULL;
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ftenum_t ftype;
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field_info *fi;
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header_field_info *hfi;
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if (!node) {
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fprintf(stderr, "traverse end: empty node. node='%p' data='%p'\n", (void *)node, (void *)data);
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return FALSE;
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}
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fi = node->finfo;
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hfi = fi ? fi->hfinfo : NULL;
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if (!hfi) {
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fprintf(stderr, "traverse end: hfi not found. node='%p'\n", (void *)node);
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return FALSE;
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}
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ftype = fvalue_type_ftenum(&fi->value);
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if (ftype != FT_NONE && ftype != FT_PROTOCOL) {
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/* convert value to string */
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val_tmp = fvalue_to_string_repr(NULL, &fi->value, FTREPR_DISPLAY, hfi->display);
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if (val_tmp)
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{
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val_str = g_strdup(val_tmp);
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wmem_free(NULL, val_tmp);
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} else
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val_str = ws_strdup_printf("unsupported type: %s", ftype_name(ftype));
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/*printf("traverse: name='%s', abbrev='%s',desc='%s', val='%s'\n", hfi->name, hfi->abbrev, ftype_name(hfi->type), val_str);*/
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printf("%s='%s' ", hfi->name, val_str);
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g_free(val_str);
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}
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return FALSE;
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}
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static tap_packet_status
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diameteravp_packet(void *pds, packet_info *pinfo, epan_dissect_t *edt _U_, const void *pdi, tap_flags_t flags _U_)
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{
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tap_packet_status ret = TAP_PACKET_DONT_REDRAW;
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double resp_time = 0.;
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gboolean is_request = TRUE;
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guint32 cmd_code = 0;
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guint32 req_frame = 0;
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guint32 ans_frame = 0;
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guint32 diam_child_node = 0;
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proto_node *current = NULL;
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proto_node *node = NULL;
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header_field_info *hfi = NULL;
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field_info *finfo = NULL;
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const diameter_req_ans_pair_t *dp = (const diameter_req_ans_pair_t *)pdi;
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diameteravp_t *ds = NULL;
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/* Validate paramerers. */
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if (!dp || !edt || !edt->tree)
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return ret;
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/* Several diameter messages within one frame are possible. *
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* Check if we processing the message in same frame like befor or in new frame.*/
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ds = (diameteravp_t *)pds;
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if (pinfo->num > ds->frame) {
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ds->frame = pinfo->num;
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ds->diammsg_toprocess = 0;
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} else {
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ds->diammsg_toprocess += 1;
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}
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/* Extract data from request/answer pair provided by diameter dissector.*/
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is_request = dp->processing_request;
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cmd_code = dp->cmd_code;
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req_frame = dp->req_frame;
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ans_frame = dp->ans_frame;
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if (!is_request) {
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nstime_t ns;
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nstime_delta(&ns, &pinfo->abs_ts, &dp->req_time);
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resp_time = nstime_to_sec(&ns);
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resp_time = resp_time < 0. ? 0. : resp_time;
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}
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/* Check command code provided by command line option.*/
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if (ds->cmd_code && ds->cmd_code != cmd_code)
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return ret;
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/* Loop over top level nodes */
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node = edt->tree->first_child;
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while (node != NULL) {
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current = node;
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node = current->next;
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finfo = current->finfo;
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hfi = finfo ? finfo->hfinfo : NULL;
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/*fprintf(stderr, "DEBUG: diameteravp_packet %d %p %p node=%p abbrev=%s\n", cmd_code, edt, edt->tree, current, hfi->abbrev);*/
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/* process current diameter subtree in the current frame. */
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if (hfi && hfi->abbrev && strcmp(hfi->abbrev, "diameter") == 0) {
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/* Process current diameter message in the frame */
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if (ds->diammsg_toprocess == diam_child_node) {
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if (is_request) {
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ds->req_count++;
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} else {
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ds->ans_count++;
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if (req_frame > 0)
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ds->paired_ans_count++;
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}
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/* Output frame data.*/
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printf("frame='%u' time='%f' src='%s' srcport='%u' dst='%s' dstport='%u' proto='diameter' msgnr='%u' is_request='%d' cmd='%u' req_frame='%u' ans_frame='%u' resp_time='%f' ",
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pinfo->num, nstime_to_sec(&pinfo->abs_ts), address_to_str(pinfo->pool, &pinfo->src), pinfo->srcport, address_to_str(pinfo->pool, &pinfo->dst), pinfo->destport, ds->diammsg_toprocess, is_request, cmd_code, req_frame, ans_frame, resp_time);
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/* Visit selected nodes of one diameter message.*/
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tree_traverse_pre_order(current, diam_tree_to_csv, &ds);
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/* End of message.*/
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printf("\n");
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/*printf("hfi: name='%s', msg_curr='%d' abbrev='%s',type='%s'\n", hfi->name, diam_child_node, hfi->abbrev, ftype_name(hfi->type));*/
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}
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diam_child_node++;
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}
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}
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return ret;
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}
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static void
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diameteravp_draw(void *pds)
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{
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diameteravp_t *ds = (diameteravp_t *)pds;
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/* printing results */
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printf("=== Diameter Summary ===\nrequest count:\t%u\nanswer count:\t%u\nreq/ans pairs:\t%u\n", ds->req_count, ds->ans_count, ds->paired_ans_count);
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}
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static void
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diameteravp_init(const char *opt_arg, void *userdata _U_)
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{
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diameteravp_t *ds;
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gchar *field = NULL;
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gchar **tokens;
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guint opt_count = 0;
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guint opt_idx = 0;
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GString *filter = NULL;
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GString *error_string = NULL;
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ds = g_new(diameteravp_t, 1);
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ds->frame = 0;
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ds->diammsg_toprocess = 0;
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ds->cmd_code = 0;
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ds->req_count = 0;
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ds->ans_count = 0;
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ds->paired_ans_count = 0;
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ds->filter = NULL;
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filter = g_string_new("diameter");
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/* Split command line options. */
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tokens = g_strsplit(opt_arg, ",", 1024);
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opt_count = 0;
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while (tokens[opt_count])
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opt_count++;
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if (opt_count > 2) {
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/* if the token is a not-null string and it's not *, the conversion must succeeed */
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if (strlen(tokens[2]) > 0 && tokens[2][0] != '*') {
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if (!ws_strtou32(tokens[2], NULL, &ds->cmd_code)) {
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fprintf(stderr, "Invalid integer token: %s\n", tokens[2]);
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g_strfreev(tokens);
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exit(1);
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}
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}
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}
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/* Loop over diameter field names. */
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for (opt_idx=3; opt_idx<opt_count; opt_idx++)
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{
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/* Current field from command line arguments. */
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field = tokens[opt_idx];
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/* Connect all requested fields with logical OR. */
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g_string_append(filter, "||");
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/* Prefix field name with "diameter." by default. */
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if (!strchr(field, '.'))
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g_string_append(filter, "diameter.");
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/* Append field name to the filter. */
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g_string_append(filter, field);
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}
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g_strfreev(tokens);
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ds->filter = g_string_free(filter, FALSE);
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error_string = register_tap_listener("diameter", ds, ds->filter, 0, NULL, diameteravp_packet, diameteravp_draw, NULL);
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if (error_string) {
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/* error, we failed to attach to the tap. clean up */
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g_free(ds);
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cmdarg_err("Couldn't register diam,csv tap: %s",
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error_string->str);
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g_string_free(error_string, TRUE);
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exit(1);
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}
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}
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static stat_tap_ui diameteravp_ui = {
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REGISTER_STAT_GROUP_GENERIC,
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NULL,
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"diameter,avp",
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diameteravp_init,
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0,
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NULL
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};
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void
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register_tap_listener_diameteravp(void)
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{
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register_stat_tap_ui(&diameteravp_ui, NULL);
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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