From c2aff6b1d1522ea4b0a6ad18acfbe7bce88eab05 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Tue, 23 Apr 2013 17:51:28 +0300 Subject: [PATCH] hostapd: Add some testing options In order to test clients in scenarios where APs may (randomly) drop certain management frames, introduce some testing options into the hostapd configuration that can make it ignore certain frames. For now, these are probe requests, authentication and (re)association frames. Signed-hostap: Johannes Berg --- hostapd/Makefile | 4 ++++ hostapd/config_file.c | 19 +++++++++++++++++++ hostapd/defconfig | 8 ++++++++ hostapd/hostapd.conf | 19 +++++++++++++++++++ src/ap/ap_config.c | 7 +++++++ src/ap/ap_config.h | 7 +++++++ src/ap/beacon.c | 10 ++++++++++ src/ap/ieee802_11.c | 30 ++++++++++++++++++++++++++++++ 8 files changed, 104 insertions(+) diff --git a/hostapd/Makefile b/hostapd/Makefile index 8404e0cb1..26cc2b513 100644 --- a/hostapd/Makefile +++ b/hostapd/Makefile @@ -824,6 +824,10 @@ LIBS += -lsqlite3 LIBS_h += -lsqlite3 endif +ifdef CONFIG_TESTING_OPTIONS +CFLAGS += -DCONFIG_TESTING_OPTIONS +endif + ALL=hostapd hostapd_cli all: verify_config $(ALL) diff --git a/hostapd/config_file.c b/hostapd/config_file.c index 12d627a8a..cd68e3ef9 100644 --- a/hostapd/config_file.c +++ b/hostapd/config_file.c @@ -2876,6 +2876,25 @@ static int hostapd_config_fill(struct hostapd_config *conf, bss->hs20_operating_class = oper_class; bss->hs20_operating_class_len = oper_class_len; #endif /* CONFIG_HS20 */ +#ifdef CONFIG_TESTING_OPTIONS +#define PARSE_TEST_PROBABILITY(_val) \ + } else if (os_strcmp(buf, #_val) == 0) { \ + char *end; \ + \ + conf->_val = strtod(pos, &end); \ + if (*end || conf->_val < 0.0d || \ + conf->_val > 1.0d) { \ + wpa_printf(MSG_ERROR, \ + "Line %d: Invalid value '%s'", \ + line, pos); \ + errors++; \ + return errors; \ + } + PARSE_TEST_PROBABILITY(ignore_probe_probability) + PARSE_TEST_PROBABILITY(ignore_auth_probability) + PARSE_TEST_PROBABILITY(ignore_assoc_probability) + PARSE_TEST_PROBABILITY(ignore_reassoc_probability) +#endif /* CONFIG_TESTING_OPTIONS */ } else if (os_strcmp(buf, "vendor_elements") == 0) { struct wpabuf *elems; size_t len = os_strlen(pos); diff --git a/hostapd/defconfig b/hostapd/defconfig index b5ddca34c..317fe740e 100644 --- a/hostapd/defconfig +++ b/hostapd/defconfig @@ -267,3 +267,11 @@ CONFIG_IPV6=y # Enable SQLite database support in hlr_auc_gw, EAP-SIM DB, and eap_user_file #CONFIG_SQLITE=y + +# Testing options +# This can be used to enable some testing options (see also the example +# configuration file) that are really useful only for testing clients that +# connect to this hostapd. These options allow, for example, to drop a +# certain percentage of probe requests or auth/(re)assoc frames. +# +#CONFIG_TESTING_OPTIONS=y diff --git a/hostapd/hostapd.conf b/hostapd/hostapd.conf index 17bb7ed78..d4425866b 100644 --- a/hostapd/hostapd.conf +++ b/hostapd/hostapd.conf @@ -1521,6 +1521,25 @@ own_ip_addr=127.0.0.1 # channels 36-48): #hs20_operating_class=5173 +##### TESTING OPTIONS ######################################################### +# +# The options in this section are only available when the build configuration +# option CONFIG_TESTING_OPTIONS is set while compiling hostapd. They allow +# testing some scenarios that are otherwise difficult to reproduce. +# +# Ignore probe requests sent to hostapd with the given probability, must be a +# floating point number in the range [0, 1). +#ignore_probe_probability=0.0 +# +# Ignore authentication frames with the given probability +#ignore_auth_probability=0.0 +# +# Ignore association requests with the given probability +#ignore_assoc_probability=0.0 +# +# Ignore reassociation requests with the given probability +#ignore_reassoc_probability=0.0 + ##### Multiple BSSID support ################################################## # # Above configuration is using the default interface (wlan#, or multi-SSID VLAN diff --git a/src/ap/ap_config.c b/src/ap/ap_config.c index 922f56469..70b26a6ee 100644 --- a/src/ap/ap_config.c +++ b/src/ap/ap_config.c @@ -163,6 +163,13 @@ struct hostapd_config * hostapd_config_defaults(void) conf->ap_table_max_size = 255; conf->ap_table_expiration_time = 60; +#ifdef CONFIG_TESTING_OPTIONS + conf->ignore_probe_probability = 0.0d; + conf->ignore_auth_probability = 0.0d; + conf->ignore_assoc_probability = 0.0d; + conf->ignore_reassoc_probability = 0.0d; +#endif /* CONFIG_TESTING_OPTIONS */ + return conf; } diff --git a/src/ap/ap_config.h b/src/ap/ap_config.h index d9ef984df..f9629a2cd 100644 --- a/src/ap/ap_config.h +++ b/src/ap/ap_config.h @@ -520,6 +520,13 @@ struct hostapd_config { u8 vht_oper_chwidth; u8 vht_oper_centr_freq_seg0_idx; u8 vht_oper_centr_freq_seg1_idx; + +#ifdef CONFIG_TESTING_OPTIONS + double ignore_probe_probability; + double ignore_auth_probability; + double ignore_assoc_probability; + double ignore_reassoc_probability; +#endif /* CONFIG_TESTING_OPTIONS */ }; diff --git a/src/ap/beacon.c b/src/ap/beacon.c index 4c47c7584..0ef307d34 100644 --- a/src/ap/beacon.c +++ b/src/ap/beacon.c @@ -488,6 +488,16 @@ void handle_probe_req(struct hostapd_data *hapd, /* TODO: verify that supp_rates contains at least one matching rate * with AP configuration */ +#ifdef CONFIG_TESTING_OPTIONS + if (hapd->iconf->ignore_probe_probability > 0.0d && + drand48() < hapd->iconf->ignore_probe_probability) { + wpa_printf(MSG_INFO, + "TESTING: ignoring probe request from " MACSTR, + MAC2STR(mgmt->sa)); + return; + } +#endif /* CONFIG_TESTING_OPTIONS */ + resp = hostapd_gen_probe_resp(hapd, sta, mgmt, elems.p2p != NULL, &resp_len); if (resp == NULL) diff --git a/src/ap/ieee802_11.c b/src/ap/ieee802_11.c index 8baa15e70..7bef55fa5 100644 --- a/src/ap/ieee802_11.c +++ b/src/ap/ieee802_11.c @@ -557,6 +557,16 @@ static void handle_auth(struct hostapd_data *hapd, return; } +#ifdef CONFIG_TESTING_OPTIONS + if (hapd->iconf->ignore_auth_probability > 0.0d && + drand48() < hapd->iconf->ignore_auth_probability) { + wpa_printf(MSG_INFO, + "TESTING: ignoring auth frame from " MACSTR, + MAC2STR(mgmt->sa)); + return; + } +#endif /* CONFIG_TESTING_OPTIONS */ + auth_alg = le_to_host16(mgmt->u.auth.auth_alg); auth_transaction = le_to_host16(mgmt->u.auth.auth_transaction); status_code = le_to_host16(mgmt->u.auth.status_code); @@ -1226,6 +1236,26 @@ static void handle_assoc(struct hostapd_data *hapd, return; } +#ifdef CONFIG_TESTING_OPTIONS + if (reassoc) { + if (hapd->iconf->ignore_reassoc_probability > 0.0d && + drand48() < hapd->iconf->ignore_reassoc_probability) { + wpa_printf(MSG_INFO, + "TESTING: ignoring reassoc request from " + MACSTR, MAC2STR(mgmt->sa)); + return; + } + } else { + if (hapd->iconf->ignore_assoc_probability > 0.0d && + drand48() < hapd->iconf->ignore_assoc_probability) { + wpa_printf(MSG_INFO, + "TESTING: ignoring assoc request from " + MACSTR, MAC2STR(mgmt->sa)); + return; + } + } +#endif /* CONFIG_TESTING_OPTIONS */ + if (reassoc) { capab_info = le_to_host16(mgmt->u.reassoc_req.capab_info); listen_interval = le_to_host16(