/* capture_opts.c * Routines for capture options setting * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * SPDX-License-Identifier: GPL-2.0-or-later */ #include #include #include #ifdef HAVE_LIBPCAP #include #include #include #include "capture_opts.h" #include "ringbuffer.h" #include #include #include #include #include "caputils/capture_ifinfo.h" #include "caputils/capture-pcap-util.h" #include "ui/filter_files.h" static gboolean capture_opts_output_to_pipe(const char *save_file, gboolean *is_pipe); void capture_opts_init(capture_options *capture_opts) { capture_opts->ifaces = g_array_new(FALSE, FALSE, sizeof(interface_options)); capture_opts->all_ifaces = g_array_new(FALSE, FALSE, sizeof(interface_t)); capture_opts->num_selected = 0; capture_opts->default_options.name = NULL; capture_opts->default_options.descr = NULL; capture_opts->default_options.cfilter = NULL; capture_opts->default_options.has_snaplen = FALSE; capture_opts->default_options.snaplen = WTAP_MAX_PACKET_SIZE_STANDARD; capture_opts->default_options.linktype = -1; /* use interface default */ capture_opts->default_options.promisc_mode = TRUE; capture_opts->default_options.if_type = IF_WIRED; capture_opts->default_options.extcap = NULL; capture_opts->default_options.extcap_fifo = NULL; capture_opts->default_options.extcap_args = NULL; capture_opts->default_options.extcap_pipedata = NULL; capture_opts->default_options.extcap_pid = WS_INVALID_PID; #ifdef _WIN32 capture_opts->default_options.extcap_pipe_h = INVALID_HANDLE_VALUE; capture_opts->default_options.extcap_control_in_h = INVALID_HANDLE_VALUE; capture_opts->default_options.extcap_control_out_h = INVALID_HANDLE_VALUE; #endif capture_opts->default_options.extcap_control_in = NULL; capture_opts->default_options.extcap_control_out = NULL; #ifdef CAN_SET_CAPTURE_BUFFER_SIZE capture_opts->default_options.buffer_size = DEFAULT_CAPTURE_BUFFER_SIZE; #endif capture_opts->default_options.monitor_mode = FALSE; #ifdef HAVE_PCAP_REMOTE capture_opts->default_options.src_type = CAPTURE_IFLOCAL; capture_opts->default_options.remote_host = NULL; capture_opts->default_options.remote_port = NULL; capture_opts->default_options.auth_type = CAPTURE_AUTH_NULL; capture_opts->default_options.auth_username = NULL; capture_opts->default_options.auth_password = NULL; capture_opts->default_options.datatx_udp = FALSE; capture_opts->default_options.nocap_rpcap = TRUE; capture_opts->default_options.nocap_local = FALSE; #endif #ifdef HAVE_PCAP_SETSAMPLING capture_opts->default_options.sampling_method = CAPTURE_SAMP_NONE; capture_opts->default_options.sampling_param = 0; #endif capture_opts->default_options.timestamp_type = NULL; capture_opts->saving_to_file = FALSE; capture_opts->save_file = NULL; capture_opts->group_read_access = FALSE; #ifdef PCAP_NG_DEFAULT capture_opts->use_pcapng = TRUE; /* Save as pcapng by default */ #else capture_opts->use_pcapng = FALSE; /* Save as pcap by default */ #endif capture_opts->real_time_mode = TRUE; capture_opts->show_info = TRUE; capture_opts->restart = FALSE; capture_opts->orig_save_file = NULL; capture_opts->multi_files_on = FALSE; capture_opts->has_file_duration = FALSE; capture_opts->file_duration = 60.0; /* 1 min */ capture_opts->has_file_interval = FALSE; capture_opts->file_interval = 60; /* 1 min */ capture_opts->has_file_packets = FALSE; capture_opts->file_packets = 0; capture_opts->has_ring_num_files = FALSE; capture_opts->ring_num_files = RINGBUFFER_MIN_NUM_FILES; capture_opts->has_autostop_files = FALSE; capture_opts->autostop_files = 1; capture_opts->has_autostop_packets = FALSE; capture_opts->autostop_packets = 0; capture_opts->has_autostop_filesize = FALSE; capture_opts->autostop_filesize = 1000; /* 1 MB */ capture_opts->has_autostop_duration = FALSE; capture_opts->autostop_duration = 60.0; /* 1 min */ capture_opts->capture_comment = NULL; capture_opts->output_to_pipe = FALSE; capture_opts->capture_child = FALSE; } void capture_opts_cleanup(capture_options *capture_opts) { if (!capture_opts) return; if (capture_opts->ifaces) { while (capture_opts->ifaces->len > 0) { capture_opts_del_iface(capture_opts, 0); } g_array_free(capture_opts->ifaces, TRUE); capture_opts->ifaces = NULL; } if (capture_opts->all_ifaces) { while (capture_opts->all_ifaces->len > 0) { interface_t *device = &g_array_index(capture_opts->all_ifaces, interface_t, 0); capture_opts_free_interface_t(device); capture_opts->all_ifaces = g_array_remove_index(capture_opts->all_ifaces, 0); } g_array_free(capture_opts->all_ifaces, TRUE); capture_opts->all_ifaces = NULL; } g_free(capture_opts->save_file); } /* log content of capture_opts */ void capture_opts_log(const char *log_domain, GLogLevelFlags log_level, capture_options *capture_opts) { guint i; g_log(log_domain, log_level, "CAPTURE OPTIONS :"); for (i = 0; i < capture_opts->ifaces->len; i++) { interface_options *interface_opts; interface_opts = &g_array_index(capture_opts->ifaces, interface_options, i); g_log(log_domain, log_level, "Interface name[%02d] : %s", i, interface_opts->name ? interface_opts->name : "(unspecified)"); g_log(log_domain, log_level, "Interface description[%02d] : %s", i, interface_opts->descr ? interface_opts->descr : "(unspecified)"); g_log(log_domain, log_level, "Display name[%02d]: %s", i, interface_opts->display_name ? interface_opts->display_name : "(unspecified)"); g_log(log_domain, log_level, "Capture filter[%02d] : %s", i, interface_opts->cfilter ? interface_opts->cfilter : "(unspecified)"); g_log(log_domain, log_level, "Snap length[%02d] (%u) : %d", i, interface_opts->has_snaplen, interface_opts->snaplen); g_log(log_domain, log_level, "Link Type[%02d] : %d", i, interface_opts->linktype); g_log(log_domain, log_level, "Promiscuous Mode[%02d]: %s", i, interface_opts->promisc_mode?"TRUE":"FALSE"); g_log(log_domain, log_level, "Extcap[%02d] : %s", i, interface_opts->extcap ? interface_opts->extcap : "(unspecified)"); g_log(log_domain, log_level, "Extcap FIFO[%02d] : %s", i, interface_opts->extcap_fifo ? interface_opts->extcap_fifo : "(unspecified)"); g_log(log_domain, log_level, "Extcap PID[%02d] : %d", i, interface_opts->extcap_pid); #ifdef CAN_SET_CAPTURE_BUFFER_SIZE g_log(log_domain, log_level, "Buffer size[%02d] : %d (MB)", i, interface_opts->buffer_size); #endif g_log(log_domain, log_level, "Monitor Mode[%02d] : %s", i, interface_opts->monitor_mode?"TRUE":"FALSE"); #ifdef HAVE_PCAP_REMOTE g_log(log_domain, log_level, "Capture source[%02d] : %s", i, interface_opts->src_type == CAPTURE_IFLOCAL ? "Local interface" : interface_opts->src_type == CAPTURE_IFREMOTE ? "Remote interface" : "Unknown"); if (interface_opts->src_type == CAPTURE_IFREMOTE) { g_log(log_domain, log_level, "Remote host[%02d] : %s", i, interface_opts->remote_host ? interface_opts->remote_host : "(unspecified)"); g_log(log_domain, log_level, "Remote port[%02d] : %s", i, interface_opts->remote_port ? interface_opts->remote_port : "(unspecified)"); } g_log(log_domain, log_level, "Authentication[%02d] : %s", i, interface_opts->auth_type == CAPTURE_AUTH_NULL ? "Null" : interface_opts->auth_type == CAPTURE_AUTH_PWD ? "By username/password" : "Unknown"); if (interface_opts->auth_type == CAPTURE_AUTH_PWD) { g_log(log_domain, log_level, "Auth username[%02d] : %s", i, interface_opts->auth_username ? interface_opts->auth_username : "(unspecified)"); g_log(log_domain, log_level, "Auth password[%02d] : ", i); } g_log(log_domain, log_level, "UDP data tfer[%02d] : %u", i, interface_opts->datatx_udp); g_log(log_domain, log_level, "No cap. RPCAP[%02d] : %u", i, interface_opts->nocap_rpcap); g_log(log_domain, log_level, "No cap. local[%02d] : %u", i, interface_opts->nocap_local); #endif #ifdef HAVE_PCAP_SETSAMPLING g_log(log_domain, log_level, "Sampling meth.[%02d] : %d", i, interface_opts->sampling_method); g_log(log_domain, log_level, "Sampling param.[%02d] : %d", i, interface_opts->sampling_param); #endif g_log(log_domain, log_level, "Timestamp type [%02d] : %s", i, interface_opts->timestamp_type); } g_log(log_domain, log_level, "Interface name[df] : %s", capture_opts->default_options.name ? capture_opts->default_options.name : "(unspecified)"); g_log(log_domain, log_level, "Interface Descr[df] : %s", capture_opts->default_options.descr ? capture_opts->default_options.descr : "(unspecified)"); g_log(log_domain, log_level, "Capture filter[df] : %s", capture_opts->default_options.cfilter ? capture_opts->default_options.cfilter : "(unspecified)"); g_log(log_domain, log_level, "Snap length[df] (%u) : %d", capture_opts->default_options.has_snaplen, capture_opts->default_options.snaplen); g_log(log_domain, log_level, "Link Type[df] : %d", capture_opts->default_options.linktype); g_log(log_domain, log_level, "Promiscuous Mode[df]: %s", capture_opts->default_options.promisc_mode?"TRUE":"FALSE"); g_log(log_domain, log_level, "Extcap[df] : %s", capture_opts->default_options.extcap ? capture_opts->default_options.extcap : "(unspecified)"); g_log(log_domain, log_level, "Extcap FIFO[df] : %s", capture_opts->default_options.extcap_fifo ? capture_opts->default_options.extcap_fifo : "(unspecified)"); #ifdef CAN_SET_CAPTURE_BUFFER_SIZE g_log(log_domain, log_level, "Buffer size[df] : %d (MB)", capture_opts->default_options.buffer_size); #endif g_log(log_domain, log_level, "Monitor Mode[df] : %s", capture_opts->default_options.monitor_mode?"TRUE":"FALSE"); #ifdef HAVE_PCAP_REMOTE g_log(log_domain, log_level, "Capture source[df] : %s", capture_opts->default_options.src_type == CAPTURE_IFLOCAL ? "Local interface" : capture_opts->default_options.src_type == CAPTURE_IFREMOTE ? "Remote interface" : "Unknown"); if (capture_opts->default_options.src_type == CAPTURE_IFREMOTE) { g_log(log_domain, log_level, "Remote host[df] : %s", capture_opts->default_options.remote_host ? capture_opts->default_options.remote_host : "(unspecified)"); g_log(log_domain, log_level, "Remote port[df] : %s", capture_opts->default_options.remote_port ? capture_opts->default_options.remote_port : "(unspecified)"); } g_log(log_domain, log_level, "Authentication[df] : %s", capture_opts->default_options.auth_type == CAPTURE_AUTH_NULL ? "Null" : capture_opts->default_options.auth_type == CAPTURE_AUTH_PWD ? "By username/password" : "Unknown"); if (capture_opts->default_options.auth_type == CAPTURE_AUTH_PWD) { g_log(log_domain, log_level, "Auth username[df] : %s", capture_opts->default_options.auth_username ? capture_opts->default_options.auth_username : "(unspecified)"); g_log(log_domain, log_level, "Auth password[df] : "); } g_log(log_domain, log_level, "UDP data tfer[df] : %u", capture_opts->default_options.datatx_udp); g_log(log_domain, log_level, "No cap. RPCAP[df] : %u", capture_opts->default_options.nocap_rpcap); g_log(log_domain, log_level, "No cap. local[df] : %u", capture_opts->default_options.nocap_local); #endif #ifdef HAVE_PCAP_SETSAMPLING g_log(log_domain, log_level, "Sampling meth. [df] : %d", capture_opts->default_options.sampling_method); g_log(log_domain, log_level, "Sampling param.[df] : %d", capture_opts->default_options.sampling_param); #endif g_log(log_domain, log_level, "Timestamp type [df] : %s", capture_opts->default_options.timestamp_type ? capture_opts->default_options.timestamp_type : "(unspecified)"); g_log(log_domain, log_level, "SavingToFile : %u", capture_opts->saving_to_file); g_log(log_domain, log_level, "SaveFile : %s", (capture_opts->save_file) ? capture_opts->save_file : ""); g_log(log_domain, log_level, "GroupReadAccess : %u", capture_opts->group_read_access); g_log(log_domain, log_level, "Fileformat : %s", (capture_opts->use_pcapng) ? "PCAPNG" : "PCAP"); g_log(log_domain, log_level, "RealTimeMode : %u", capture_opts->real_time_mode); g_log(log_domain, log_level, "ShowInfo : %u", capture_opts->show_info); g_log(log_domain, log_level, "MultiFilesOn : %u", capture_opts->multi_files_on); g_log(log_domain, log_level, "FileDuration (%u) : %.3f", capture_opts->has_file_duration, capture_opts->file_duration); g_log(log_domain, log_level, "FileInterval (%u) : %u", capture_opts->has_file_interval, capture_opts->file_interval); g_log(log_domain, log_level, "FilePackets (%u) : %u", capture_opts->has_file_packets, capture_opts->file_packets); g_log(log_domain, log_level, "RingNumFiles (%u) : %u", capture_opts->has_ring_num_files, capture_opts->ring_num_files); g_log(log_domain, log_level, "AutostopFiles (%u) : %u", capture_opts->has_autostop_files, capture_opts->autostop_files); g_log(log_domain, log_level, "AutostopPackets (%u) : %u", capture_opts->has_autostop_packets, capture_opts->autostop_packets); g_log(log_domain, log_level, "AutostopFilesize(%u) : %u (KB)", capture_opts->has_autostop_filesize, capture_opts->autostop_filesize); g_log(log_domain, log_level, "AutostopDuration(%u) : %.3f", capture_opts->has_autostop_duration, capture_opts->autostop_duration); } /* * Given a string of the form ":", as might appear * as an argument to a "-a" option, parse it and set the criterion in * question. Return an indication of whether it succeeded or failed * in some fashion. */ static gboolean set_autostop_criterion(capture_options *capture_opts, const char *autostoparg) { gchar *p, *colonp; colonp = strchr(autostoparg, ':'); if (colonp == NULL) return FALSE; p = colonp; *p++ = '\0'; /* * Skip over any white space (there probably won't be any, but * as we allow it in the preferences file, we might as well * allow it here). */ while (g_ascii_isspace(*p)) p++; if (*p == '\0') { /* * Put the colon back, so if our caller uses, in an * error message, the string they passed us, the message * looks correct. */ *colonp = ':'; return FALSE; } if (strcmp(autostoparg,"duration") == 0) { capture_opts->has_autostop_duration = TRUE; capture_opts->autostop_duration = get_positive_double(p,"autostop duration"); } else if (strcmp(autostoparg,"filesize") == 0) { capture_opts->has_autostop_filesize = TRUE; capture_opts->autostop_filesize = get_nonzero_guint32(p,"autostop filesize"); } else if (strcmp(autostoparg,"files") == 0) { capture_opts->multi_files_on = TRUE; capture_opts->has_autostop_files = TRUE; capture_opts->autostop_files = get_positive_int(p,"autostop files"); } else if (strcmp(autostoparg,"packets") == 0) { capture_opts->has_autostop_packets = TRUE; capture_opts->autostop_packets = get_positive_int(p,"packet count"); } else { return FALSE; } *colonp = ':'; /* put the colon back */ return TRUE; } static gboolean get_filter_arguments(capture_options* capture_opts, const char* arg) { char* colonp; char* val; char* filter_exp = NULL; colonp = strchr(arg, ':'); if (colonp) { val = colonp; *val = '\0'; val++; if (strcmp(arg, "predef") == 0) { GList* filterItem; filterItem = get_filter_list_first(CFILTER_LIST); while (filterItem != NULL) { filter_def *filterDef; filterDef = (filter_def*)filterItem->data; if (strcmp(val, filterDef->name) == 0) { filter_exp = g_strdup(filterDef->strval); break; } filterItem = filterItem->next; } } } if (filter_exp == NULL) { /* No filter expression found yet; fallback to previous implemention and assume the arg contains a filter expression */ if (colonp) { *colonp = ':'; /* restore colon */ } filter_exp = g_strdup(arg); } if (capture_opts->ifaces->len > 0) { interface_options *interface_opts; interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1); g_free(interface_opts->cfilter); interface_opts->cfilter = filter_exp; return TRUE; } else { g_free(capture_opts->default_options.cfilter); capture_opts->default_options.cfilter = filter_exp; return TRUE; } } /* * Given a string of the form ":", as might appear * as an argument to a "-b" option, parse it and set the arguments in * question. Return an indication of whether it succeeded or failed * in some fashion. */ static gboolean get_ring_arguments(capture_options *capture_opts, const char *arg) { gchar *p = NULL, *colonp; colonp = strchr(arg, ':'); if (colonp == NULL) return FALSE; p = colonp; *p++ = '\0'; /* * Skip over any white space (there probably won't be any, but * as we allow it in the preferences file, we might as well * allow it here). */ while (g_ascii_isspace(*p)) p++; if (*p == '\0') { /* * Put the colon back, so if our caller uses, in an * error message, the string they passed us, the message * looks correct. */ *colonp = ':'; return FALSE; } if (strcmp(arg,"files") == 0) { capture_opts->has_ring_num_files = TRUE; capture_opts->ring_num_files = get_nonzero_guint32(p, "number of ring buffer files"); } else if (strcmp(arg,"filesize") == 0) { capture_opts->has_autostop_filesize = TRUE; capture_opts->autostop_filesize = get_nonzero_guint32(p, "ring buffer filesize"); } else if (strcmp(arg,"duration") == 0) { capture_opts->has_file_duration = TRUE; capture_opts->file_duration = get_positive_double(p, "ring buffer duration"); } else if (strcmp(arg,"interval") == 0) { capture_opts->has_file_interval = TRUE; capture_opts->file_interval = get_positive_int(p, "ring buffer interval"); } else if (strcmp(arg,"packets") == 0) { capture_opts->has_file_packets = TRUE; capture_opts->file_packets = get_positive_int(p, "ring buffer packet count"); } *colonp = ':'; /* put the colon back */ return TRUE; } #ifdef HAVE_PCAP_SETSAMPLING /* * Given a string of the form ":", as might appear * as an argument to a "-m" option, parse it and set the arguments in * question. Return an indication of whether it succeeded or failed * in some fashion. */ static gboolean get_sampling_arguments(capture_options *capture_opts, const char *arg) { gchar *p = NULL, *colonp; colonp = strchr(arg, ':'); if (colonp == NULL) return FALSE; p = colonp; *p++ = '\0'; while (g_ascii_isspace(*p)) p++; if (*p == '\0') { *colonp = ':'; return FALSE; } if (strcmp(arg, "count") == 0) { if (capture_opts->ifaces->len > 0) { interface_options *interface_opts; interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1); interface_opts->sampling_method = CAPTURE_SAMP_BY_COUNT; interface_opts->sampling_param = get_positive_int(p, "sampling count"); } else { capture_opts->default_options.sampling_method = CAPTURE_SAMP_BY_COUNT; capture_opts->default_options.sampling_param = get_positive_int(p, "sampling count"); } } else if (strcmp(arg, "timer") == 0) { if (capture_opts->ifaces->len > 0) { interface_options *interface_opts; interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1); interface_opts->sampling_method = CAPTURE_SAMP_BY_TIMER; interface_opts->sampling_param = get_positive_int(p, "sampling timer"); } else { capture_opts->default_options.sampling_method = CAPTURE_SAMP_BY_TIMER; capture_opts->default_options.sampling_param = get_positive_int(p, "sampling timer"); } } *colonp = ':'; return TRUE; } #endif #ifdef HAVE_PCAP_REMOTE /* * Given a string of the form ":", as might appear * as an argument to a "-A" option, parse it and set the arguments in * question. Return an indication of whether it succeeded or failed * in some fashion. */ static gboolean get_auth_arguments(capture_options *capture_opts, const char *arg) { gchar *p = NULL, *colonp; colonp = strchr(arg, ':'); if (colonp == NULL) return FALSE; p = colonp; *p++ = '\0'; while (g_ascii_isspace(*p)) p++; if (capture_opts->ifaces->len > 0) { interface_options *interface_opts; interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1); interface_opts->auth_type = CAPTURE_AUTH_PWD; interface_opts->auth_username = g_strdup(arg); interface_opts->auth_password = g_strdup(p); } else { capture_opts->default_options.auth_type = CAPTURE_AUTH_PWD; capture_opts->default_options.auth_username = g_strdup(arg); capture_opts->default_options.auth_password = g_strdup(p); } *colonp = ':'; return TRUE; } #endif #ifdef _WIN32 static char * capture_opts_generate_display_name(const char *friendly_name, const char *name _U_) { /* * Display the friendly name rather than the not-so-friendly * GUID-based interface name. */ return g_strdup(friendly_name); } #else static char * capture_opts_generate_display_name(const char *friendly_name, const char *name) { /* * On UN*X, however, users are more used to interface names, * and may find it helpful to see them. */ return g_strdup_printf("%s: %s", friendly_name, name); } #endif static void fill_in_interface_opts_from_ifinfo(interface_options *interface_opts, const if_info_t *if_info) { interface_opts->name = g_strdup(if_info->name); if (if_info->friendly_name != NULL) { /* * We have a friendly name; remember it as the * description... */ interface_opts->descr = g_strdup(if_info->friendly_name); /* * ...and use it in the console display name. */ interface_opts->display_name = capture_opts_generate_display_name(if_info->friendly_name, if_info->name); } else { /* fallback to the interface name */ interface_opts->descr = NULL; interface_opts->display_name = g_strdup(if_info->name); } interface_opts->if_type = if_info->type; interface_opts->extcap = g_strdup(if_info->extcap); } static gboolean fill_in_interface_opts_from_ifinfo_by_name(interface_options *interface_opts, const char *name) { gboolean matched; GList *if_list; int err; GList *if_entry; if_info_t *if_info; size_t prefix_length; matched = FALSE; if_list = capture_interface_list(&err, NULL, NULL); if (if_list != NULL) { /* * Try and do an exact match (case insensitive) on the * interface name, the interface description, and the * hardware description. */ for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) { if_info = (if_info_t *)if_entry->data; /* * Does the specified name match the interface name * with a case-insensitive match? */ if (g_ascii_strcasecmp(if_info->name, name) == 0) { /* * Yes. */ matched = TRUE; break; } /* * Does this interface have a friendly name and, if so, * does the specified name match the friendly name with * a case-insensitive match? */ if (if_info->friendly_name != NULL && g_ascii_strcasecmp(if_info->friendly_name, name) == 0) { /* * Yes. */ matched = TRUE; break; } } if (!matched) { /* * We didn't find it; attempt a case-insensitive prefix match * of the friendly name. */ prefix_length = strlen(name); for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) { if_info = (if_info_t *)if_entry->data; if (if_info->friendly_name != NULL && g_ascii_strncasecmp(if_info->friendly_name, name, prefix_length) == 0) { /* * We found an interface whose friendly name matches * with a case-insensitive prefix match. */ matched = TRUE; break; } } } } if (matched) { /* * We found an interface that matches. */ fill_in_interface_opts_from_ifinfo(interface_opts, if_info); } free_interface_list(if_list); return matched; } static int capture_opts_add_iface_opt(capture_options *capture_opts, const char *optarg_str_p) { long adapter_index; char *p; GList *if_list; if_info_t *if_info; int err; gchar *err_str; interface_options interface_opts; /* * If the argument is a number, treat it as an index into the list * of adapters, as printed by "tshark -D". * * This should be OK on UNIX systems, as interfaces shouldn't have * names that begin with digits. It can be useful on Windows, where * more than one interface can have the same name. */ adapter_index = strtol(optarg_str_p, &p, 10); if (p != NULL && *p == '\0') { if (adapter_index < 0) { cmdarg_err("The specified adapter index is a negative number"); return 1; } if (adapter_index > INT_MAX) { cmdarg_err("The specified adapter index is too large (greater than %d)", INT_MAX); return 1; } if (adapter_index == 0) { cmdarg_err("There is no interface with that adapter index"); return 1; } if_list = capture_interface_list(&err, &err_str, NULL); if (if_list == NULL) { if (err == 0) cmdarg_err("There are no interfaces on which a capture can be done"); else { cmdarg_err("%s", err_str); g_free(err_str); } return 2; } if_info = (if_info_t *)g_list_nth_data(if_list, (int)(adapter_index - 1)); if (if_info == NULL) { cmdarg_err("There is no interface with that adapter index"); return 1; } fill_in_interface_opts_from_ifinfo(&interface_opts, if_info); free_interface_list(if_list); } else if (capture_opts->capture_child) { /* * In Wireshark capture child mode, so the exact interface name * is supplied, and we don't need to look it up. */ if_info = if_info_get(optarg_str_p); fill_in_interface_opts_from_ifinfo(&interface_opts, if_info); if_info_free(if_info); } else { /* * Search for that name in the interface list and, if we found * it, fill in fields in the interface_opts structure. */ if (!fill_in_interface_opts_from_ifinfo_by_name(&interface_opts, optarg_str_p)) { /* * We didn't find the interface in the list; just use * the specified name, so that, for example, if an * interface doesn't show up in the list for some * reason, the user can try specifying it explicitly * for testing purposes. */ interface_opts.name = g_strdup(optarg_str_p); interface_opts.descr = NULL; interface_opts.display_name = g_strdup(optarg_str_p); interface_opts.if_type = capture_opts->default_options.if_type; interface_opts.extcap = g_strdup(capture_opts->default_options.extcap); } } interface_opts.cfilter = g_strdup(capture_opts->default_options.cfilter); interface_opts.snaplen = capture_opts->default_options.snaplen; interface_opts.has_snaplen = capture_opts->default_options.has_snaplen; interface_opts.linktype = capture_opts->default_options.linktype; interface_opts.promisc_mode = capture_opts->default_options.promisc_mode; interface_opts.extcap_fifo = g_strdup(capture_opts->default_options.extcap_fifo); interface_opts.extcap_args = NULL; interface_opts.extcap_pid = WS_INVALID_PID; interface_opts.extcap_pipedata = NULL; #ifdef _WIN32 interface_opts.extcap_pipe_h = INVALID_HANDLE_VALUE; interface_opts.extcap_control_in_h = INVALID_HANDLE_VALUE; interface_opts.extcap_control_out_h = INVALID_HANDLE_VALUE; #endif interface_opts.extcap_control_in = g_strdup(capture_opts->default_options.extcap_control_in); interface_opts.extcap_control_out = g_strdup(capture_opts->default_options.extcap_control_out); #ifdef CAN_SET_CAPTURE_BUFFER_SIZE interface_opts.buffer_size = capture_opts->default_options.buffer_size; #endif interface_opts.monitor_mode = capture_opts->default_options.monitor_mode; #ifdef HAVE_PCAP_REMOTE interface_opts.src_type = capture_opts->default_options.src_type; interface_opts.remote_host = g_strdup(capture_opts->default_options.remote_host); interface_opts.remote_port = g_strdup(capture_opts->default_options.remote_port); interface_opts.auth_type = capture_opts->default_options.auth_type; interface_opts.auth_username = g_strdup(capture_opts->default_options.auth_username); interface_opts.auth_password = g_strdup(capture_opts->default_options.auth_password); interface_opts.datatx_udp = capture_opts->default_options.datatx_udp; interface_opts.nocap_rpcap = capture_opts->default_options.nocap_rpcap; interface_opts.nocap_local = capture_opts->default_options.nocap_local; #endif #ifdef HAVE_PCAP_SETSAMPLING interface_opts.sampling_method = capture_opts->default_options.sampling_method; interface_opts.sampling_param = capture_opts->default_options.sampling_param; #endif interface_opts.timestamp_type = capture_opts->default_options.timestamp_type; g_array_append_val(capture_opts->ifaces, interface_opts); return 0; } int capture_opts_add_opt(capture_options *capture_opts, int opt, const char *optarg_str_p, gboolean *start_capture) { int status, snaplen; switch(opt) { case LONGOPT_NUM_CAP_COMMENT: /* capture comment */ if (capture_opts->capture_comment) { cmdarg_err("--capture-comment can be set only once per file"); return 1; } capture_opts->capture_comment = g_strdup(optarg_str_p); break; case 'a': /* autostop criteria */ if (set_autostop_criterion(capture_opts, optarg_str_p) == FALSE) { cmdarg_err("Invalid or unknown -a flag \"%s\"", optarg_str_p); return 1; } break; #ifdef HAVE_PCAP_REMOTE case 'A': if (get_auth_arguments(capture_opts, optarg_str_p) == FALSE) { cmdarg_err("Invalid or unknown -A arg \"%s\"", optarg_str_p); return 1; } break; #endif case 'b': /* Ringbuffer option */ capture_opts->multi_files_on = TRUE; if (get_ring_arguments(capture_opts, optarg_str_p) == FALSE) { cmdarg_err("Invalid or unknown -b arg \"%s\"", optarg_str_p); return 1; } break; #ifdef CAN_SET_CAPTURE_BUFFER_SIZE case 'B': /* Buffer size */ if (capture_opts->ifaces->len > 0) { interface_options *interface_opts; interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1); interface_opts->buffer_size = get_positive_int(optarg_str_p, "buffer size"); } else { capture_opts->default_options.buffer_size = get_positive_int(optarg_str_p, "buffer size"); } break; #endif case 'c': /* Capture n packets */ /* XXX Use set_autostop_criterion instead? */ capture_opts->has_autostop_packets = TRUE; capture_opts->autostop_packets = get_positive_int(optarg_str_p, "packet count"); break; case 'f': /* capture filter */ get_filter_arguments(capture_opts, optarg_str_p); break; case 'g': /* enable group read access on the capture file(s) */ capture_opts->group_read_access = TRUE; break; case 'H': /* Hide capture info dialog box */ capture_opts->show_info = FALSE; break; case LONGOPT_SET_TSTAMP_TYPE: /* Set capture time stamp type */ if (capture_opts->ifaces->len > 0) { interface_options *interface_opts; interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1); g_free(interface_opts->timestamp_type); interface_opts->timestamp_type = g_strdup(optarg_str_p); } else { g_free(capture_opts->default_options.timestamp_type); capture_opts->default_options.timestamp_type = g_strdup(optarg_str_p); } break; case 'i': /* Use interface x */ status = capture_opts_add_iface_opt(capture_opts, optarg_str_p); if (status != 0) { return status; } break; #ifdef HAVE_PCAP_CREATE case 'I': /* Capture in monitor mode */ if (capture_opts->ifaces->len > 0) { interface_options *interface_opts; interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1); interface_opts->monitor_mode = TRUE; } else { capture_opts->default_options.monitor_mode = TRUE; } break; #endif case 'k': /* Start capture immediately */ *start_capture = TRUE; break; /*case 'l':*/ /* Automatic scrolling in live capture mode */ #ifdef HAVE_PCAP_SETSAMPLING case 'm': if (get_sampling_arguments(capture_opts, optarg_str_p) == FALSE) { cmdarg_err("Invalid or unknown -m arg \"%s\"", optarg_str_p); return 1; } break; #endif case 'n': /* Use pcapng format */ capture_opts->use_pcapng = TRUE; break; case 'p': /* Don't capture in promiscuous mode */ if (capture_opts->ifaces->len > 0) { interface_options *interface_opts; interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1); interface_opts->promisc_mode = FALSE; } else { capture_opts->default_options.promisc_mode = FALSE; } break; case 'P': /* Use pcap format */ capture_opts->use_pcapng = FALSE; break; #ifdef HAVE_PCAP_REMOTE case 'r': if (capture_opts->ifaces->len > 0) { interface_options *interface_opts; interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1); interface_opts->nocap_rpcap = FALSE; } else { capture_opts->default_options.nocap_rpcap = FALSE; } break; #endif case 's': /* Set the snapshot (capture) length */ snaplen = get_natural_int(optarg_str_p, "snapshot length"); /* * Make a snapshot length of 0 equivalent to the maximum packet * length, mirroring what tcpdump does. */ if (snaplen == 0) snaplen = WTAP_MAX_PACKET_SIZE_STANDARD; if (capture_opts->ifaces->len > 0) { interface_options *interface_opts; interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1); interface_opts->has_snaplen = TRUE; interface_opts->snaplen = snaplen; } else { capture_opts->default_options.snaplen = snaplen; capture_opts->default_options.has_snaplen = TRUE; } break; case 'S': /* "Real-Time" mode: used for following file ala tail -f */ capture_opts->real_time_mode = TRUE; break; #ifdef HAVE_PCAP_REMOTE case 'u': if (capture_opts->ifaces->len > 0) { interface_options *interface_opts; interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1); interface_opts->datatx_udp = TRUE; } else { capture_opts->default_options.datatx_udp = TRUE; } break; #endif case 'w': /* Write to capture file x */ capture_opts->saving_to_file = TRUE; g_free(capture_opts->save_file); capture_opts->save_file = g_strdup(optarg_str_p); capture_opts->orig_save_file = g_strdup(optarg_str_p); status = capture_opts_output_to_pipe(capture_opts->save_file, &capture_opts->output_to_pipe); return status; case 'y': /* Set the pcap data link type */ if (capture_opts->ifaces->len > 0) { interface_options *interface_opts; interface_opts = &g_array_index(capture_opts->ifaces, interface_options, capture_opts->ifaces->len - 1); interface_opts->linktype = linktype_name_to_val(optarg_str_p); if (interface_opts->linktype == -1) { cmdarg_err("The specified data link type \"%s\" isn't valid", optarg_str_p); return 1; } } else { capture_opts->default_options.linktype = linktype_name_to_val(optarg_str_p); if (capture_opts->default_options.linktype == -1) { cmdarg_err("The specified data link type \"%s\" isn't valid", optarg_str_p); return 1; } } break; default: /* the caller is responsible to send us only the right opt's */ g_assert_not_reached(); } return 0; } void capture_opts_print_if_capabilities(if_capabilities_t *caps, char *name, int queries) { GList *lt_entry, *ts_entry; if (queries & CAPS_QUERY_LINK_TYPES) { if (caps->can_set_rfmon) printf("Data link types of interface %s when %sin monitor mode (use option -y to set):\n", name, queries & CAPS_MONITOR_MODE ? "" : "not "); else printf("Data link types of interface %s (use option -y to set):\n", name); for (lt_entry = caps->data_link_types; lt_entry != NULL; lt_entry = g_list_next(lt_entry)) { data_link_info_t *data_link_info = (data_link_info_t *)lt_entry->data; printf(" %s", data_link_info->name); if (data_link_info->description != NULL) printf(" (%s)", data_link_info->description); else printf(" (not supported)"); printf("\n"); } } if (queries & CAPS_QUERY_TIMESTAMP_TYPES) { printf("Timestamp types of the interface (use option --time-stamp-type to set):\n"); for (ts_entry = caps->timestamp_types; ts_entry != NULL; ts_entry = g_list_next(ts_entry)) { timestamp_info_t *timestamp = (timestamp_info_t *)ts_entry->data; printf(" %s", timestamp->name); if (timestamp->description != NULL) printf(" (%s)", timestamp->description); else printf(" (none)"); printf("\n"); } } } /* Print an ASCII-formatted list of interfaces. */ void capture_opts_print_interfaces(GList *if_list) { int i; GList *if_entry; if_info_t *if_info; i = 1; /* Interface id number */ for (if_entry = g_list_first(if_list); if_entry != NULL; if_entry = g_list_next(if_entry)) { if_info = (if_info_t *)if_entry->data; printf("%d. %s", i++, if_info->name); /* Print the interface friendly name, if it exists; if not, fall back to the vendor description, if it exists. */ if (if_info->friendly_name != NULL){ printf(" (%s)", if_info->friendly_name); } else { if (if_info->vendor_description != NULL) printf(" (%s)", if_info->vendor_description); } printf("\n"); } } void capture_opts_trim_snaplen(capture_options *capture_opts, int snaplen_min) { guint i; interface_options *interface_opts; if (capture_opts->ifaces->len > 0) { for (i = 0; i < capture_opts->ifaces->len; i++) { interface_opts = &g_array_index(capture_opts->ifaces, interface_options, 0); if (interface_opts->snaplen < 1) interface_opts->snaplen = WTAP_MAX_PACKET_SIZE_STANDARD; else if (interface_opts->snaplen < snaplen_min) interface_opts->snaplen = snaplen_min; } } else { if (capture_opts->default_options.snaplen < 1) capture_opts->default_options.snaplen = WTAP_MAX_PACKET_SIZE_STANDARD; else if (capture_opts->default_options.snaplen < snaplen_min) capture_opts->default_options.snaplen = snaplen_min; } } void capture_opts_trim_ring_num_files(capture_options *capture_opts) { /* Check the value range of the ring_num_files parameter */ if (capture_opts->ring_num_files > RINGBUFFER_MAX_NUM_FILES) { cmdarg_err("Too many ring buffer files (%u). Reducing to %u.\n", capture_opts->ring_num_files, RINGBUFFER_MAX_NUM_FILES); capture_opts->ring_num_files = RINGBUFFER_MAX_NUM_FILES; } else if (capture_opts->ring_num_files > RINGBUFFER_WARN_NUM_FILES) { cmdarg_err("%u is a lot of ring buffer files.\n", capture_opts->ring_num_files); } #if RINGBUFFER_MIN_NUM_FILES > 0 else if (capture_opts->ring_num_files < RINGBUFFER_MIN_NUM_FILES) cmdarg_err("Too few ring buffer files (%u). Increasing to %u.\n", capture_opts->ring_num_files, RINGBUFFER_MIN_NUM_FILES); capture_opts->ring_num_files = RINGBUFFER_MIN_NUM_FILES; #endif } /* * If no interface was specified explicitly, pick a default. */ int capture_opts_default_iface_if_necessary(capture_options *capture_opts, const char *capture_device) { int status; /* Did the user specify an interface to use? */ if (capture_opts->num_selected != 0 || capture_opts->ifaces->len != 0) { /* yes they did, return immediately - nothing further to do here */ return 0; } /* No - is a default specified in the preferences file? */ if (capture_device != NULL) { /* Yes - use it. */ status = capture_opts_add_iface_opt(capture_opts, capture_device); return status; } /* No default in preferences file, just pick the first interface from the list of interfaces. */ return capture_opts_add_iface_opt(capture_opts, "1"); } #ifndef S_IFIFO #define S_IFIFO _S_IFIFO #endif #ifndef S_ISFIFO #define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFIFO) #endif /* copied from filesystem.c */ static int capture_opts_test_for_fifo(const char *path) { ws_statb64 statb; if (ws_stat64(path, &statb) < 0) return errno; if (S_ISFIFO(statb.st_mode)) return ESPIPE; else return 0; } static gboolean capture_opts_output_to_pipe(const char *save_file, gboolean *is_pipe) { int err; *is_pipe = FALSE; if (save_file != NULL) { /* We're writing to a capture file. */ if (strcmp(save_file, "-") == 0) { /* Writing to stdout. */ /* XXX - should we check whether it's a pipe? It's arguably silly to do "-w - >output_file" rather than "-w output_file", but by not checking we might be violating the Principle Of Least Astonishment. */ *is_pipe = TRUE; } else { /* not writing to stdout, test for a FIFO (aka named pipe) */ err = capture_opts_test_for_fifo(save_file); switch (err) { case ENOENT: /* it doesn't exist, so we'll be creating it, and it won't be a FIFO */ case 0: /* found it, but it's not a FIFO */ break; case ESPIPE: /* it is a FIFO */ *is_pipe = TRUE; break; default: /* couldn't stat it */ break; /* ignore: later attempt to open */ /* will generate a nice msg */ } } } return 0; } void capture_opts_del_iface(capture_options *capture_opts, guint if_index) { interface_options *interface_opts; interface_opts = &g_array_index(capture_opts->ifaces, interface_options, if_index); /* XXX - check if found? */ g_free(interface_opts->name); g_free(interface_opts->descr); g_free(interface_opts->display_name); g_free(interface_opts->cfilter); g_free(interface_opts->timestamp_type); g_free(interface_opts->extcap); g_free(interface_opts->extcap_fifo); if (interface_opts->extcap_args) g_hash_table_unref(interface_opts->extcap_args); if (interface_opts->extcap_pid != WS_INVALID_PID) ws_pipe_close((ws_pipe_t *) interface_opts->extcap_pipedata); g_free(interface_opts->extcap_pipedata); g_free(interface_opts->extcap_control_in); g_free(interface_opts->extcap_control_out); #ifdef HAVE_PCAP_REMOTE if (interface_opts->src_type == CAPTURE_IFREMOTE) { g_free(interface_opts->remote_host); g_free(interface_opts->remote_port); g_free(interface_opts->auth_username); g_free(interface_opts->auth_password); } #endif capture_opts->ifaces = g_array_remove_index(capture_opts->ifaces, if_index); } /* * Add all non-hidden selected interfaces in the "all interfaces" list * to the list of interfaces for the capture. */ void collect_ifaces(capture_options *capture_opts) { guint i; interface_t *device; interface_options interface_opts; /* Empty out the existing list of interfaces. */ for (i = capture_opts->ifaces->len; i != 0; i--) capture_opts_del_iface(capture_opts, i-1); /* Now fill the list up again. */ for (i = 0; i < capture_opts->all_ifaces->len; i++) { device = &g_array_index(capture_opts->all_ifaces, interface_t, i); if (!device->hidden && device->selected) { interface_opts.name = g_strdup(device->name); interface_opts.descr = g_strdup(device->friendly_name); interface_opts.display_name = g_strdup(device->display_name); interface_opts.linktype = device->active_dlt; interface_opts.cfilter = g_strdup(device->cfilter); interface_opts.timestamp_type = g_strdup(device->timestamp_type); interface_opts.snaplen = device->snaplen; interface_opts.has_snaplen = device->has_snaplen; interface_opts.promisc_mode = device->pmode; interface_opts.if_type = device->if_info.type; interface_opts.extcap = g_strdup(device->if_info.extcap); interface_opts.extcap_fifo = NULL; interface_opts.extcap_pipedata = NULL; interface_opts.extcap_args = device->external_cap_args_settings; interface_opts.extcap_pid = WS_INVALID_PID; if (interface_opts.extcap_args) g_hash_table_ref(interface_opts.extcap_args); interface_opts.extcap_pipedata = NULL; #ifdef _WIN32 interface_opts.extcap_pipe_h = INVALID_HANDLE_VALUE; interface_opts.extcap_control_in_h = INVALID_HANDLE_VALUE; interface_opts.extcap_control_out_h = INVALID_HANDLE_VALUE; #endif interface_opts.extcap_control_in = NULL; interface_opts.extcap_control_out = NULL; #ifdef CAN_SET_CAPTURE_BUFFER_SIZE interface_opts.buffer_size = device->buffer; #endif #ifdef HAVE_PCAP_CREATE interface_opts.monitor_mode = device->monitor_mode_enabled; #endif #ifdef HAVE_PCAP_REMOTE interface_opts.src_type = CAPTURE_IFREMOTE; interface_opts.remote_host = g_strdup(device->remote_opts.remote_host_opts.remote_host); interface_opts.remote_port = g_strdup(device->remote_opts.remote_host_opts.remote_port); interface_opts.auth_type = device->remote_opts.remote_host_opts.auth_type; interface_opts.auth_username = g_strdup(device->remote_opts.remote_host_opts.auth_username); interface_opts.auth_password = g_strdup(device->remote_opts.remote_host_opts.auth_password); interface_opts.datatx_udp = device->remote_opts.remote_host_opts.datatx_udp; interface_opts.nocap_rpcap = device->remote_opts.remote_host_opts.nocap_rpcap; interface_opts.nocap_local = device->remote_opts.remote_host_opts.nocap_local; #endif #ifdef HAVE_PCAP_SETSAMPLING interface_opts.sampling_method = device->remote_opts.sampling_method; interface_opts.sampling_param = device->remote_opts.sampling_param; #endif g_array_append_val(capture_opts->ifaces, interface_opts); } else { continue; } } } static void capture_opts_free_interface_t_links(gpointer elem, gpointer unused _U_) { link_row* e = (link_row*)elem; if (e != NULL) g_free(e->name); g_free(elem); } void capture_opts_free_interface_t(interface_t *device) { if (device != NULL) { g_free(device->name); g_free(device->display_name); g_free(device->friendly_name); g_free(device->addresses); g_free(device->cfilter); g_free(device->timestamp_type); g_list_foreach(device->links, capture_opts_free_interface_t_links, NULL); g_list_free(device->links); #ifdef HAVE_PCAP_REMOTE g_free(device->remote_opts.remote_host_opts.remote_host); g_free(device->remote_opts.remote_host_opts.remote_port); g_free(device->remote_opts.remote_host_opts.auth_username); g_free(device->remote_opts.remote_host_opts.auth_password); #endif g_free(device->if_info.name); g_free(device->if_info.friendly_name); g_free(device->if_info.vendor_description); g_slist_free_full(device->if_info.addrs, g_free); g_free(device->if_info.extcap); } } #endif /* HAVE_LIBPCAP */ /* * Editor modelines - https://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 4 * tab-width: 8 * indent-tabs-mode: nil * End: * * vi: set shiftwidth=4 tabstop=8 expandtab: * :indentSize=4:tabSize=8:noTabs=true: */