diff options
Diffstat (limited to 'dumpcap.c')
| -rw-r--r-- | dumpcap.c | 146 |
1 files changed, 120 insertions, 26 deletions
@@ -502,29 +502,111 @@ create_data_link_info(int dlt) return data_link_info; } -static GList * -get_pcap_linktype_list(const char *devname, char **err_str) +static if_capabilities_t * +get_if_capabilities(const char *devname, gboolean monitor_mode +#ifndef HAVE_PCAP_CREATE + _U_ +#endif +, char **err_str) { - GList *linktype_list = NULL; + if_capabilities_t *caps; + char errbuf[PCAP_ERRBUF_SIZE]; pcap_t *pch; +#ifdef HAVE_PCAP_CREATE + int status; +#endif int deflt; - char errbuf[PCAP_ERRBUF_SIZE]; #ifdef HAVE_PCAP_LIST_DATALINKS int *linktypes; int i, nlt; #endif data_link_info_t *data_link_info; + /* + * Allocate the interface capabilities structure. + */ + caps = g_malloc(sizeof *caps); + #ifdef HAVE_PCAP_OPEN pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf); + caps->can_set_rfmon = FALSE; + if (pch == NULL) { + if (err_str != NULL) + *err_str = g_strdup(errbuf); + g_free(caps); + return NULL; + } +#elif defined(HAVE_PCAP_CREATE) + pch = pcap_create(devname, errbuf); + if (pch == NULL) { + if (err_str != NULL) + *err_str = g_strdup(errbuf); + g_free(caps); + return NULL; + } + status = pcap_can_set_rfmon(pch); + switch (status) { + + case 0: + caps->can_set_rfmon = FALSE; + break; + + case 1: + caps->can_set_rfmon = TRUE; + if (monitor_mode) + pcap_set_rfmon(pch, 1); + break; + + case PCAP_ERROR_NO_SUCH_DEVICE: + if (err_str != NULL) + *err_str = g_strdup_printf("There is no capture device named \"%s\"", devname); + pcap_close(pch); + g_free(caps); + return NULL; + + case PCAP_ERROR: + if (err_str != NULL) + *err_str = g_strdup_printf("pcap_can_set_rfmon on \"%s\" failed: %s", + devname, pcap_geterr(pch)); + pcap_close(pch); + g_free(caps); + return NULL; + + default: + if (err_str != NULL) + *err_str = g_strdup_printf("pcap_can_set_rfmon on \"%s\" failed: %s", + devname, pcap_statustostr(status)); + pcap_close(pch); + g_free(caps); + return NULL; + } + + status = pcap_activate(pch); + if (status < 0) { + /* Error. We ignore warnings (status > 0). */ + if (err_str != NULL) { + if (status == PCAP_ERROR) { + *err_str = g_strdup_printf("pcap_activate on %s failed: %s", + devname, pcap_geterr(pch)); + } else { + *err_str = g_strdup_printf("pcap_activate on %s failed: %s", + devname, pcap_statustostr(status)); + } + } + pcap_close(pch); + g_free(caps); + return NULL; + } #else pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf); -#endif + caps->can_set_rfmon = FALSE; if (pch == NULL) { if (err_str != NULL) *err_str = g_strdup(errbuf); - return NULL; + g_free(caps); + return NULL; } +#endif deflt = get_pcap_linktype(pch, devname); #ifdef HAVE_PCAP_LIST_DATALINKS nlt = pcap_list_datalinks(pch, &linktypes); @@ -534,6 +616,7 @@ get_pcap_linktype_list(const char *devname, char **err_str) *err_str = NULL; /* an empty list doesn't mean an error */ return NULL; } + caps->data_link_types = NULL; for (i = 0; i < nlt; i++) { data_link_info = create_data_link_info(linktypes[i]); @@ -543,9 +626,11 @@ get_pcap_linktype_list(const char *devname, char **err_str) * device has as the default? */ if (linktypes[i] == deflt) - linktype_list = g_list_prepend(linktype_list, data_link_info); + caps->data_link_types = g_list_prepend(caps->data_link_types, + data_link_info); else - linktype_list = g_list_append(linktype_list, data_link_info); + caps->data_link_types = g_list_append(caps->data_link_types, + data_link_info); } #ifdef HAVE_PCAP_FREE_DATALINKS pcap_free_datalinks(linktypes); @@ -575,14 +660,15 @@ get_pcap_linktype_list(const char *devname, char **err_str) #else /* HAVE_PCAP_LIST_DATALINKS */ data_link_info = create_data_link_info(deflt); - linktype_list = g_list_append(linktype_list, data_link_info); + caps->data_link_types = g_list_append(caps->data_link_types, + data_link_info); #endif /* HAVE_PCAP_LIST_DATALINKS */ pcap_close(pch); if (err_str != NULL) *err_str = NULL; - return linktype_list; + return caps; } #define ADDRSTRLEN 46 /* Covers IPv4 & IPv6 */ @@ -652,16 +738,21 @@ print_machine_readable_interfaces(GList *if_list) /* * If you change the machine-readable output format of this function, - * you MUST update capture_sync.c:sync_linktype_list_open() accordingly! + * you MUST update capture_ifinfo.c:capture_get_if_capabilities() accordingly! */ static void -print_machine_readable_link_layer_types(GList *lt_list) +print_machine_readable_if_capabilities(if_capabilities_t *caps) { GList *lt_entry; data_link_info_t *data_link_info; const gchar *desc_str; - for (lt_entry = lt_list; lt_entry != NULL; lt_entry = g_list_next(lt_entry)) { + if (caps->can_set_rfmon) + printf("1\n"); + else + printf("0\n"); + for (lt_entry = caps->data_link_types; lt_entry != NULL; + lt_entry = g_list_next(lt_entry)) { data_link_info = (data_link_info_t *)lt_entry->data; if (data_link_info->description != NULL) desc_str = data_link_info->description; @@ -3381,25 +3472,28 @@ main(int argc, char *argv[]) exit_main(0); } else if (list_link_layer_types) { /* Get the list of link-layer types for the capture device. */ - GList *lt_list; + if_capabilities_t *caps; gchar *err_str; - lt_list = get_pcap_linktype_list(global_capture_opts.iface, &err_str); - if (lt_list == NULL) { - if (err_str != NULL) { - cmdarg_err("The list of data link types for the capture device \"%s\" could not be obtained (%s)." - "Please check to make sure you have sufficient permissions, and that\n" - "you have the proper interface or pipe specified.\n", global_capture_opts.iface, err_str); - g_free(err_str); - } else - cmdarg_err("The capture device \"%s\" has no data link types.", global_capture_opts.iface); + caps = get_if_capabilities(global_capture_opts.iface, + global_capture_opts.monitor_mode, &err_str); + if (caps == NULL) { + cmdarg_err("The capabilities of the capture device \"%s\" could not be obtained (%s)." + "Please check to make sure you have sufficient permissions, and that\n" + "you have the proper interface or pipe specified.\n", global_capture_opts.iface, err_str); + g_free(err_str); + exit_main(2); + } + if (caps->data_link_types == NULL) { + cmdarg_err("The capture device \"%s\" has no data link types.", global_capture_opts.iface); exit_main(2); } if (machine_readable) /* tab-separated values to stdout */ - print_machine_readable_link_layer_types(lt_list); + print_machine_readable_if_capabilities(caps); else - capture_opts_print_link_layer_types(lt_list); - free_pcap_linktype_list(lt_list); + capture_opts_print_if_capabilities(caps, + global_capture_opts.monitor_mode); + free_if_capabilities(caps); exit_main(0); } else if (print_statistics) { status = print_statistics_loop(machine_readable); |