ui/tap_export_pdu.c

   1 /* tap_export_pdu.c
   2  * Routines for exporting PDU:s to file
   3  *
   4  * Wireshark - Network traffic analyzer
   5  * By Gerald Combs <gerald@wireshark.org>
   6  * Copyright 1998 Gerald Combs
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version 2
  11  * of the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  21  */
  22
  23 #include "config.h"
  24
  25 #include <glib.h>
  26
  27 #include "globals.h"
  28 #include "wtap.h"
  29 #include "pcap-encap.h"
  30 #include "version_info.h"
  31 #include "wsutil/tempfile.h"
  32
  33 #include <epan/tap.h>
  34 #include <epan/exported_pdu.h>
  35
  36 #include "ui/alert_box.h"
  37 #include "ui/simple_dialog.h"
  38 #include "tap_export_pdu.h"
  39
  40 /* Main entry point to the tap */
  41 int
  42 export_pdu_packet(void *tapdata, packet_info *pinfo, epan_dissect_t *edt _U_, const void *data)
  43 {
  44     const exp_pdu_data_t *exp_pdu_data = (const exp_pdu_data_t *)data;
  45     exp_pdu_t  *exp_pdu_tap_data = (exp_pdu_t *)tapdata;
  46     struct wtap_pkthdr pkthdr;
  47     int err;
  48     int buffer_len;
  49     guint8 *packet_buf;
  50
  51     buffer_len = exp_pdu_data->tvb_captured_length + exp_pdu_data->tlv_buffer_len;
  52     packet_buf = (guint8 *)g_malloc(buffer_len);
  53
  54     if(exp_pdu_data->tlv_buffer_len > 0){
  55         memcpy(packet_buf, exp_pdu_data->tlv_buffer, exp_pdu_data->tlv_buffer_len);
  56         g_free(exp_pdu_data->tlv_buffer);
  57     }
  58     if(exp_pdu_data->tvb_length > 0){
  59         tvb_memcpy(exp_pdu_data->pdu_tvb, packet_buf+exp_pdu_data->tlv_buffer_len, 0, exp_pdu_data->tvb_length);
  60     }
  61     pkthdr.ts.secs   = pinfo->fd->abs_ts.secs;
  62     pkthdr.ts.nsecs  = pinfo->fd->abs_ts.nsecs;
  63     pkthdr.caplen    = buffer_len;
  64     pkthdr.len       = exp_pdu_data->tvb_reported_length + exp_pdu_data->tlv_buffer_len;
  65
  66     pkthdr.pkt_encap = exp_pdu_tap_data->pkt_encap;
  67     pkthdr.interface_id = 0;
  68     pkthdr.presence_flags = 0;
  69     pkthdr.opt_comment = g_strdup(pinfo->pkt_comment);
  70     pkthdr.drop_count = 0;
  71     pkthdr.pack_flags = 0;
  72     pkthdr.presence_flags = WTAP_HAS_CAP_LEN|WTAP_HAS_INTERFACE_ID|WTAP_HAS_TS|WTAP_HAS_PACK_FLAGS;
  73
  74     wtap_dump(exp_pdu_tap_data->wdh, &pkthdr, packet_buf, &err);
  75
  76     g_free(packet_buf);
  77     g_free(pkthdr.opt_comment);
  78
  79     return FALSE; /* Do not redraw */
  80 }
  81
  82 void
  83 exp_pdu_file_open(exp_pdu_t *exp_pdu_tap_data)
  84 {
  85     int   import_file_fd;
  86     char *tmpname, *capfile_name;
  87     int   err;
  88
  89     /* pcapng defs */
  90     wtapng_section_t            *shb_hdr;
  91     wtapng_iface_descriptions_t *idb_inf;
  92     wtapng_if_descr_t            int_data;
  93     GString                     *os_info_str;
  94     char                         appname[100];
  95
  96     /* Choose a random name for the temporary import buffer */
  97     import_file_fd = create_tempfile(&tmpname, "Wireshark_PDU_");
  98     capfile_name = g_strdup(tmpname);
  99
 100     /* Create data for SHB  */
 101     os_info_str = g_string_new("");
 102     get_os_version_info(os_info_str);
 103
 104     g_snprintf(appname, sizeof(appname), "Wireshark " VERSION "%s", wireshark_gitversion);
 105
 106     shb_hdr = g_new(wtapng_section_t,1);
 107     shb_hdr->section_length = -1;
 108     /* options */
 109     shb_hdr->opt_comment    = g_strdup_printf("Dump of PDU:s from %s", cfile.filename);
 110     shb_hdr->shb_hardware   = NULL;                    /* UTF-8 string containing the
 111                                                        * description of the hardware used to create this section.
 112                                                        */
 113     shb_hdr->shb_os         = os_info_str->str;        /* UTF-8 string containing the name
 114                                                        * of the operating system used to create this section.
 115                                                        */
 116     g_string_free(os_info_str, FALSE);                /* The actual string is not freed */
 117     shb_hdr->shb_user_appl  = appname;                /* UTF-8 string containing the name
 118                                                        *  of the application used to create this section.
 119                                                        */
 120
 121
 122     /* Create fake IDB info */
 123     idb_inf = g_new(wtapng_iface_descriptions_t,1);
 124     idb_inf->number_of_interfaces = 1;
 125     idb_inf->interface_data = g_array_new(FALSE, FALSE, sizeof(wtapng_if_descr_t));
 126
 127     /* create the fake interface data */
 128     int_data.wtap_encap            = WTAP_ENCAP_WIRESHARK_UPPER_PDU;
 129     int_data.time_units_per_second = 1000000; /* default microsecond resolution */
 130     int_data.link_type             = wtap_wtap_encap_to_pcap_encap(WTAP_ENCAP_WIRESHARK_UPPER_PDU);
 131     int_data.snap_len              = WTAP_MAX_PACKET_SIZE;
 132     int_data.if_name               = g_strdup("Fake IF, PDU->Export");
 133     int_data.opt_comment           = NULL;
 134     int_data.if_description        = NULL;
 135     int_data.if_speed              = 0;
 136     int_data.if_tsresol            = 6;
 137     int_data.if_filter_str         = NULL;
 138     int_data.bpf_filter_len        = 0;
 139     int_data.if_filter_bpf_bytes   = NULL;
 140     int_data.if_os                 = NULL;
 141     int_data.if_fcslen             = -1;
 142     int_data.num_stat_entries      = 0;          /* Number of ISB:s */
 143     int_data.interface_statistics  = NULL;
 144
 145     g_array_append_val(idb_inf->interface_data, int_data);
 146
 147     exp_pdu_tap_data->wdh = wtap_dump_fdopen_ng(import_file_fd, WTAP_FILE_TYPE_SUBTYPE_PCAPNG, WTAP_ENCAP_WIRESHARK_UPPER_PDU, WTAP_MAX_PACKET_SIZE, FALSE, shb_hdr, idb_inf, &err);
 148     if (exp_pdu_tap_data->wdh == NULL) {
 149         open_failure_alert_box(capfile_name, err, TRUE);
 150         goto end;
 151     }
 152
 153
 154     /* Run the tap */
 155     cf_retap_packets(&cfile);
 156
 157
 158     if (!wtap_dump_close(exp_pdu_tap_data->wdh, &err)) {
 159         write_failure_alert_box(capfile_name, err);
 160     }
 161
 162     remove_tap_listener(exp_pdu_tap_data);
 163
 164     if (cf_open(&cfile, capfile_name, WTAP_TYPE_AUTO, TRUE /* temporary file */, &err) != CF_OK) {
 165         open_failure_alert_box(capfile_name, err, FALSE);
 166         goto end;
 167     }
 168
 169     switch (cf_read(&cfile, FALSE)) {
 170     case CF_READ_OK:
 171     case CF_READ_ERROR:
 172     /* Just because we got an error, that doesn't mean we were unable
 173        to read any of the file; we handle what we could get from the
 174        file. */
 175     break;
 176
 177     case CF_READ_ABORTED:
 178     /* The user bailed out of re-reading the capture file; the
 179        capture file has been closed - just free the capture file name
 180        string and return (without changing the last containing
 181        directory). */
 182     break;
 183     }
 184
 185 end:
 186     g_free(capfile_name);
 187 }
 188
 189 gboolean
 190 do_export_pdu(const char *filter, gchar *tap_name, gpointer data)
 191 {
 192     GString        *error_string;
 193     exp_pdu_t  *exp_pdu_tap_data = (exp_pdu_t *)data;
 194
 195     /* Register this tap listener now */
 196     error_string = register_tap_listener(tap_name,             /* The name of the tap we want to listen to */
 197                                          exp_pdu_tap_data,     /* instance identifier/pointer to a struct holding
 198                                                                 * all state variables */
 199                                          filter,               /* pointer to a filter string */
 200                                          TL_REQUIRES_NOTHING,  /* flags for the tap listener */
 201                                          NULL,
 202                                          export_pdu_packet,
 203                                          NULL);
 204     if (error_string){
 205         /* Error.  We failed to attach to the tap. Clean up */
 206         simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, "%s", error_string->str);
 207         g_string_free(error_string, TRUE);
 208         return FALSE;
 209     }
 210
 211     exp_pdu_file_open(exp_pdu_tap_data);
 212     return TRUE;
 213 }
 214
 215 /*
 216  * Editor modelines
 217  *
 218  * Local Variables:
 219  * c-basic-offset: 4
 220  * tab-width: 8
 221  * indent-tabs-mode: nil
 222  * End:
 223  *
 224  * ex: set shiftwidth=4 tabstop=8 expandtab:
 225  * :indentSize=4:tabSize=8:noTabs=true:
 226  */