capture_opts.h

   1 /* capture_opts.h
   2  * Capture options (all parameters needed to do the actual capture)
   3  *
   4  * Wireshark - Network traffic analyzer
   5  * By Gerald Combs <gerald@wireshark.org>
   6  * Copyright 1998 Gerald Combs
   7  *
   8  * SPDX-License-Identifier: GPL-2.0-or-later
   9  */
  10
  11
  12 /** @file
  13  *
  14  *  Capture options (all parameters needed to do the actual capture)
  15  *
  16  */
  17
  18 #ifndef __CAPTURE_OPTS_H__
  19 #define __CAPTURE_OPTS_H__
  20
  21 #include <sys/types.h>     /* for gid_t */
  22
  23 #include <capture/capture_ifinfo.h>
  24 #include "ringbuffer.h"
  25 #include <wsutil/wslog.h>
  26 #include <wsutil/filter_files.h>
  27
  28 #ifdef _WIN32
  29 #include <windows.h>
  30 #endif
  31
  32 #ifdef __cplusplus
  33 extern "C" {
  34 #endif /* __cplusplus */
  35
  36 /*
  37  * Long options.
  38  * We do not currently have long options corresponding to all short
  39  * options; we should probably pick appropriate option names for them.
  40  *
  41  * NOTE:
  42  * for tshark, we're using a leading - in the optstring to prevent getopt()
  43  * from permuting the argv[] entries, in this case, unknown argv[] entries
  44  * will be returned as parameters to a dummy-option 1.
  45  * In short: we must not use 1 here, which is another reason to use
  46  * values outside the range of ASCII graphic characters.
  47  */
  48 #define LONGOPT_LIST_TSTAMP_TYPES LONGOPT_BASE_CAPTURE+1
  49 #define LONGOPT_SET_TSTAMP_TYPE   LONGOPT_BASE_CAPTURE+2
  50 #define LONGOPT_COMPRESS_TYPE     LONGOPT_BASE_CAPTURE+3
  51 #define LONGOPT_CAPTURE_TMPDIR    LONGOPT_BASE_CAPTURE+4
  52 #define LONGOPT_UPDATE_INTERVAL   LONGOPT_BASE_CAPTURE+5
  53
  54 /*
  55  * Options for capturing common to all capturing programs.
  56  */
  57 #ifdef HAVE_PCAP_REMOTE
  58 #define OPTSTRING_A "A:"
  59 #else
  60 #define OPTSTRING_A
  61 #endif
  62
  63 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
  64 #define LONGOPT_BUFFER_SIZE \
  65     {"buffer-size", ws_required_argument, NULL, 'B'},
  66 #define OPTSTRING_B "B:"
  67 #else
  68 #define LONGOPT_BUFFER_SIZE
  69 #define OPTSTRING_B
  70 #endif
  71
  72 #ifdef HAVE_PCAP_CREATE
  73 #define LONGOPT_MONITOR_MODE {"monitor-mode", ws_no_argument, NULL, 'I'},
  74 #define OPTSTRING_I "I"
  75 #else
  76 #define LONGOPT_MONITOR_MODE
  77 #define OPTSTRING_I
  78 #endif
  79
  80 #define LONGOPT_CAPTURE_COMMON \
  81     {"autostop",              ws_required_argument, NULL, 'a'}, \
  82     {"ring-buffer",           ws_required_argument, NULL, 'b'}, \
  83     LONGOPT_BUFFER_SIZE \
  84     {"list-interfaces",       ws_no_argument,       NULL, 'D'}, \
  85     {"interface",             ws_required_argument, NULL, 'i'}, \
  86     LONGOPT_MONITOR_MODE \
  87     {"list-data-link-types",  ws_no_argument,       NULL, 'L'}, \
  88     {"no-promiscuous-mode",   ws_no_argument,       NULL, 'p'}, \
  89     {"snapshot-length",       ws_required_argument, NULL, 's'}, \
  90     {"linktype",              ws_required_argument, NULL, 'y'}, \
  91     {"list-time-stamp-types", ws_no_argument,       NULL, LONGOPT_LIST_TSTAMP_TYPES}, \
  92     {"time-stamp-type",       ws_required_argument, NULL, LONGOPT_SET_TSTAMP_TYPE}, \
  93     {"compress-type",         ws_required_argument, NULL, LONGOPT_COMPRESS_TYPE}, \
  94     {"temp-dir",              ws_required_argument, NULL, LONGOPT_CAPTURE_TMPDIR},\
  95     {"update-interval",       ws_required_argument, NULL, LONGOPT_UPDATE_INTERVAL},
  96
  97
  98 #define OPTSTRING_CAPTURE_COMMON \
  99     "a:" OPTSTRING_A "b:" OPTSTRING_B "c:Df:F:i:" OPTSTRING_I "Lps:y:"
 100
 101 #ifdef HAVE_PCAP_REMOTE
 102 /* Type of capture source */
 103 typedef enum {
 104     CAPTURE_IFLOCAL,        /**< Local network interface */
 105     CAPTURE_IFREMOTE        /**< Remote network interface */
 106 } capture_source;
 107
 108 /* Type of RPCAPD Authentication */
 109 typedef enum {
 110     CAPTURE_AUTH_NULL,      /**< No authentication */
 111     CAPTURE_AUTH_PWD        /**< User/password authentication */
 112 } capture_auth;
 113 #endif
 114 #ifdef HAVE_PCAP_SETSAMPLING
 115 /**
 116  * Method of packet sampling (dropping some captured packets),
 117  * may require additional integer parameter, marked here as N
 118  */
 119 typedef enum {
 120     CAPTURE_SAMP_NONE,      /**< No sampling - capture all packets */
 121     CAPTURE_SAMP_BY_COUNT,  /**< Counter-based sampling -
 122                                  capture 1 packet from every N */
 123     CAPTURE_SAMP_BY_TIMER   /**< Timer-based sampling -
 124                                  capture no more than 1 packet
 125                                  in N milliseconds */
 126 } capture_sampling;
 127 #endif
 128
 129 #ifdef HAVE_PCAP_REMOTE
 130 struct remote_host_info {
 131     char         *remote_host;      /**< Host name or network address for remote capturing */
 132     char         *remote_port;      /**< TCP port of remote RPCAP server */
 133     capture_auth  auth_type;        /**< Authentication type */
 134     char         *auth_username;    /**< Remote authentication parameters */
 135     char         *auth_password;    /**< Remote authentication parameters */
 136     bool          datatx_udp;
 137     bool          nocap_rpcap;
 138     bool          nocap_local;
 139 };
 140
 141 struct remote_host {
 142     char         *r_host;           /**< Host name or network address for remote capturing */
 143     char         *remote_port;      /**< TCP port of remote RPCAP server */
 144     capture_auth  auth_type;        /**< Authentication type */
 145     char         *auth_username;    /**< Remote authentication parameters */
 146     char         *auth_password;    /**< Remote authentication parameters */
 147 };
 148
 149 typedef struct remote_options_tag {
 150     capture_source src_type;
 151     struct remote_host_info remote_host_opts;
 152 #ifdef HAVE_PCAP_SETSAMPLING
 153     capture_sampling sampling_method;
 154     int sampling_param;
 155 #endif
 156 } remote_options;
 157 #endif /* HAVE_PCAP_REMOTE */
 158
 159 typedef struct interface_tag {
 160     char           *name;
 161     char           *display_name;
 162     char           *addresses;
 163     int             no_addresses;
 164     char           *cfilter;
 165     GList          *links;
 166     int             active_dlt;
 167     bool            pmode;
 168     bool            has_snaplen;
 169     int             snaplen;
 170     bool            local;
 171 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
 172     int             buffer;
 173 #endif
 174 #ifdef HAVE_PCAP_CREATE
 175     bool            monitor_mode_enabled;
 176     bool            monitor_mode_supported;
 177 #endif
 178 #ifdef HAVE_PCAP_REMOTE
 179     remote_options  remote_opts;
 180 #endif
 181     uint32_t        last_packets;
 182     uint32_t        packet_diff;
 183     if_info_t       if_info;
 184     bool            selected;
 185     bool            hidden;
 186     /* External capture cached data */
 187     GHashTable     *external_cap_args_settings;
 188     char           *timestamp_type;
 189 } interface_t;
 190
 191 typedef struct link_row_tag {
 192     char *name;
 193     int dlt;
 194 } link_row;
 195
 196 typedef struct interface_options_tag {
 197     char             *name;                 /* the name of the interface supplied to libpcap/WinPcap/Npcap to specify the interface */
 198     char             *descr;                /* a more user-friendly description of the interface; may be NULL if none */
 199     char             *hardware;             /* description of the hardware */
 200     char             *display_name;         /* the name displayed in the console and title bar */
 201     char             *ifname;               /* if not null, name to use instead of the interface naem in IDBs */
 202     char             *cfilter;
 203     bool              has_snaplen;
 204     int               snaplen;
 205     int               linktype;
 206     bool              promisc_mode;
 207     interface_type    if_type;
 208     char             *extcap;
 209     char             *extcap_fifo;
 210     GHashTable       *extcap_args;
 211     GPid              extcap_pid;           /* pid of running process or WS_INVALID_PID */
 212     void *            extcap_pipedata;
 213     GString          *extcap_stderr;
 214     unsigned          extcap_stdout_watch;
 215     unsigned          extcap_stderr_watch;
 216 #ifdef _WIN32
 217     HANDLE            extcap_pipe_h;
 218     HANDLE            extcap_control_in_h;
 219     HANDLE            extcap_control_out_h;
 220 #endif
 221     char             *extcap_control_in;
 222     char             *extcap_control_out;
 223 #ifdef CAN_SET_CAPTURE_BUFFER_SIZE
 224     int               buffer_size;
 225 #endif
 226     bool              monitor_mode;
 227 #ifdef HAVE_PCAP_REMOTE
 228     capture_source    src_type;
 229     char             *remote_host;
 230     char             *remote_port;
 231     capture_auth      auth_type;
 232     char             *auth_username;
 233     char             *auth_password;
 234     bool              datatx_udp;
 235     bool              nocap_rpcap;
 236     bool              nocap_local;
 237 #endif
 238 #ifdef HAVE_PCAP_SETSAMPLING
 239     capture_sampling  sampling_method;
 240     int               sampling_param;
 241 #endif
 242     char             *timestamp_type;       /* requested timestamp as string */
 243     int               timestamp_type_id;    /* Timestamp type to pass to pcap_set_tstamp_type.
 244                                                only valid if timestamp_type != NULL */
 245 } interface_options;
 246
 247 /** Capture options coming from user interface */
 248 typedef struct capture_options_tag {
 249     /* general */
 250     GList             *(*get_iface_list)(int *, char **);
 251                                               /**< routine to call to get the interface list */
 252     GArray            *ifaces;                /**< the interfaces to use for the
 253                                                    next capture, entries are of
 254                                                    type interface_options */
 255     GArray            *all_ifaces;            /**< all interfaces, entries are
 256                                                    of type interface_t */
 257     int                ifaces_err;            /**< if all_ifaces is null, the error
 258                                                    when it was fetched, if any */
 259     char              *ifaces_err_info;       /**< error string for that error */
 260     unsigned           num_selected;
 261
 262     /*
 263      * Options to be applied to all interfaces.
 264      *
 265      * Some of these can be set from the GUI, others can't; setting
 266      * the link-layer header type, for example, doesn't necessarily
 267      * make sense, as different interfaces may support different sets
 268      * of link-layer header types.
 269      *
 270      * Some that can't be set from the GUI can be set from the command
 271      * line, by specifying them before any interface is specified.
 272      * This includes the link-layer header type, so if somebody asks
 273      * for a link-layer header type that an interface on which they're
 274      * capturing doesn't support, we should report an error and fail
 275      * to capture.
 276      *
 277      * These can be overridden per-interface.
 278      */
 279     interface_options  default_options;
 280
 281     bool               saving_to_file;        /**< true if capture is writing to a file */
 282     char              *save_file;             /**< the capture file name */
 283     bool               group_read_access;     /**< true is group read permission needs to be set */
 284     bool               use_pcapng;            /**< true if file format is pcapng */
 285     unsigned           update_interval;       /**< Time in milliseconds. How often to notify parent of new packet counts, check file duration, etc. */
 286
 287     /* GUI related */
 288     bool               real_time_mode;        /**< Update list of packets in real time */
 289     bool               show_info;             /**< show the info dialog. */
 290     bool               restart;               /**< restart after closing is done */
 291     char              *orig_save_file;        /**< the original capture file name (saved for a restart) */
 292
 293     /* multiple files (and ringbuffer) */
 294     bool               multi_files_on;        /**< true if ring buffer in use */
 295
 296     bool               has_file_duration;     /**< true if ring duration specified */
 297     double             file_duration;         /**< Switch file after n seconds */
 298     bool               has_file_interval;     /**< true if ring interval specified */
 299     int32_t            file_interval;         /**< Create time intervals of n seconds */
 300     bool               has_file_packets;      /**< true if ring packet count is
 301                                                    specified */
 302     int                file_packets;          /**< Switch file after n packets */
 303     bool               has_ring_num_files;    /**< true if ring num_files specified */
 304     uint32_t           ring_num_files;        /**< Number of multiple buffer files */
 305     bool               has_nametimenum;       /**< true if file name has date part before num part  */
 306
 307     /* autostop conditions */
 308     bool               has_autostop_files;    /**< true if maximum number of capture files
 309                                                    are specified */
 310     int                autostop_files;        /**< Maximum number of capture files */
 311
 312     bool               has_autostop_packets;  /**< true if maximum packet count is
 313                                                    specified */
 314     int                autostop_packets;      /**< Maximum packet count */
 315     bool               has_autostop_written_packets;  /**< true if maximum packet count is
 316                                                    specified */
 317     int                autostop_written_packets;      /**< Maximum packet count */
 318     bool               has_autostop_filesize; /**< true if maximum capture file size
 319                                                    is specified */
 320     uint32_t           autostop_filesize;     /**< Maximum capture file size in kB */
 321     bool               has_autostop_duration; /**< true if maximum capture duration
 322                                                    is specified */
 323     double             autostop_duration;     /**< Maximum capture duration */
 324
 325     bool               print_file_names;      /**< true if printing names of completed
 326                                                    files as we close them */
 327     char              *print_name_to;         /**< output file name */
 328     char              *temp_dir;              /**< temporary directory path */
 329
 330     /* internally used (don't touch from outside) */
 331     bool               output_to_pipe;        /**< save_file is a pipe (named or stdout) */
 332     bool               capture_child;         /**< hidden option: Wireshark child mode */
 333     bool               stop_after_extcaps;    /**< request dumpcap stop after last extcap */
 334     bool               wait_for_extcap_cbs;   /**< extcaps terminated, waiting for callbacks */
 335     char              *compress_type;         /**< compress type */
 336     char              *closed_msg;            /**< Dumpcap capture closed message */
 337     unsigned           extcap_terminate_id;   /**< extcap process termination source ID */
 338     filter_list_t     *capture_filters_list;  /**< list of saved capture filters */
 339 } capture_options;
 340
 341 /*
 342  * Initialize the capture_options with some reasonable values, and
 343  * provide a routine it can use to fetch a list of capture options
 344  * if it needs it.
 345  *
 346  * (Getting that list might involve running dumpcap, so we don't want
 347  * to waste time doing that if we don't have to.)
 348  */
 349 extern void
 350 capture_opts_init(capture_options *capture_opts, GList *(*get_iface_list)(int *, char **));
 351
 352 /* clean internal structures */
 353 extern void
 354 capture_opts_cleanup(capture_options *capture_opts);
 355
 356 /* set a command line option value */
 357 extern int
 358 capture_opts_add_opt(capture_options *capture_opts, int opt, const char *ws_optarg);
 359
 360 /* log content of capture_opts */
 361 extern void
 362 capture_opts_log(const char *domain, enum ws_log_level level, capture_options *capture_opts);
 363
 364 /* List supported file types for capturing. This is intentionally smaller
 365  * than the list supported by libwiretap (and dumpcap isn't linked with
 366  * libwiretap.) */
 367 extern void
 368 capture_opts_list_file_types(void);
 369
 370 enum caps_query {
 371     CAPS_QUERY_LINK_TYPES      = 0x1,
 372     CAPS_QUERY_TIMESTAMP_TYPES = 0x2
 373 };
 374
 375 /* print interface capabilities, including link layer types */
 376 extern int
 377 capture_opts_print_if_capabilities(if_capabilities_t *caps,
 378                                    const interface_options *interface_opts,
 379                                    int queries);
 380
 381 /* print list of interfaces */
 382 extern void
 383 capture_opts_print_interfaces(GList *if_list);
 384
 385 /* trim the snaplen entry */
 386 extern void
 387 capture_opts_trim_snaplen(capture_options *capture_opts, int snaplen_min);
 388
 389 /* trim the ring_num_files entry */
 390 extern void
 391 capture_opts_trim_ring_num_files(capture_options *capture_opts);
 392
 393 /* pick default interface if none was specified */
 394 extern int
 395 capture_opts_default_iface_if_necessary(capture_options *capture_opts,
 396                                         const char *capture_device);
 397
 398 extern void
 399 capture_opts_del_iface(capture_options *capture_opts, unsigned if_index);
 400
 401 extern void
 402 interface_opts_free(interface_options *interface_opts);
 403
 404 extern interface_options*
 405 interface_opts_from_if_info(capture_options *capture_opts, const if_info_t *if_info);
 406
 407 extern void
 408 collect_ifaces(capture_options *capture_opts);
 409
 410 extern void
 411 capture_opts_free_link_row(void *elem);
 412
 413 extern void
 414 capture_opts_free_interface_t(interface_t *device);
 415
 416 /* Default capture buffer size in Mbytes. */
 417 #define DEFAULT_CAPTURE_BUFFER_SIZE 2
 418
 419 /* Default update interval in milliseconds */
 420 #define DEFAULT_UPDATE_INTERVAL 100
 421
 422 #ifdef __cplusplus
 423 }
 424 #endif /* __cplusplus */
 425
 426 #endif /* __CAPTURE_OPTS_H__ */
 427
 428 /*
 429  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 430  *
 431  * Local variables:
 432  * c-basic-offset: 4
 433  * tab-width: 8
 434  * indent-tabs-mode: nil
 435  * End:
 436  *
 437  * vi: set shiftwidth=4 tabstop=8 expandtab:
 438  * :indentSize=4:tabSize=8:noTabs=true:
 439  */