C++ os_snprintf_error函数代码示例

static int hostapd_cli_cmd_bss_tm_req(struct wpa_ctrl *ctrl, int argc,
				      char *argv[])
{
	char buf[2000], *tmp;
	int res, i, total;

	if (argc < 1) {
		printf("Invalid 'bss_tm_req' command - at least one argument (STA addr) is needed\n");
		return -1;
	}

	res = os_snprintf(buf, sizeof(buf), "BSS_TM_REQ %s", argv[0]);
	if (os_snprintf_error(sizeof(buf), res))
		return -1;

	total = res;
	for (i = 1; i < argc; i++) {
		tmp = &buf[total];
		res = os_snprintf(tmp, sizeof(buf) - total, " %s", argv[i]);
		if (os_snprintf_error(sizeof(buf) - total, res))
			return -1;
		total += res;
	}
	return wpa_ctrl_command(ctrl, buf);
}

/**
 * pmksa_cache_auth_list - Dump text list of entries in PMKSA cache
 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init()
 * @buf: Buffer for the list
 * @len: Length of the buffer
 * Returns: Number of bytes written to buffer
 *
 * This function is used to generate a text format representation of the
 * current PMKSA cache contents for the ctrl_iface PMKSA command.
 */
int pmksa_cache_auth_list(struct rsn_pmksa_cache *pmksa, char *buf, size_t len)
{
	int i, ret;
	char *pos = buf;
	struct rsn_pmksa_cache_entry *entry;
	struct os_reltime now;

	os_get_reltime(&now);
	ret = os_snprintf(pos, buf + len - pos,
			  "Index / SPA / PMKID / expiration (in seconds) / opportunistic\n");
	if (os_snprintf_error(buf + len - pos, ret))
		return pos - buf;
	pos += ret;
	i = 0;
	entry = pmksa->pmksa;
	while (entry) {
		ret = os_snprintf(pos, buf + len - pos, "%d " MACSTR " ",
				  i, MAC2STR(entry->spa));
		if (os_snprintf_error(buf + len - pos, ret))
			return pos - buf;
		pos += ret;
		pos += wpa_snprintf_hex(pos, buf + len - pos, entry->pmkid,
					PMKID_LEN);
		ret = os_snprintf(pos, buf + len - pos, " %d %d\n",
				  (int) (entry->expiration - now.sec),
				  entry->opportunistic);
		if (os_snprintf_error(buf + len - pos, ret))
			return pos - buf;
		pos += ret;
		entry = entry->next;
	}
	return pos - buf;
}

int wpa_supplicant_ap_wps_pin(struct wpa_supplicant *wpa_s, const u8 *bssid,
			      const char *pin, char *buf, size_t buflen,
			      int timeout)
{
	int ret, ret_len = 0;

	if (!wpa_s->ap_iface)
		return -1;

	if (pin == NULL) {
		unsigned int rpin;

		if (wps_generate_pin(&rpin) < 0)
			return -1;
		ret_len = os_snprintf(buf, buflen, "%08d", rpin);
		if (os_snprintf_error(buflen, ret_len))
			return -1;
		pin = buf;
	} else if (buf) {
		ret_len = os_snprintf(buf, buflen, "%s", pin);
		if (os_snprintf_error(buflen, ret_len))
			return -1;
	}

	ret = hostapd_wps_add_pin(wpa_s->ap_iface->bss[0], bssid, "any", pin,
				  timeout);
	if (ret)
		return -1;
	return ret_len;
}

static int write_cmd(char *buf, size_t buflen, const char *cmd, int argc,
		     char *argv[])
{
	int i, res;
	char *pos, *end;

	pos = buf;
	end = buf + buflen;

	res = os_snprintf(pos, end - pos, "%s", cmd);
	if (os_snprintf_error(end - pos, res))
		goto fail;
	pos += res;

	for (i = 0; i < argc; i++) {
		res = os_snprintf(pos, end - pos, " %s", argv[i]);
		if (os_snprintf_error(end - pos, res))
			goto fail;
		pos += res;
	}

	buf[buflen - 1] = '\0';
	return 0;

fail:
	printf("Too long command\n");
	return -1;
}

void p2p_channels_dump(struct p2p_data *p2p, const char *title,
		       const struct p2p_channels *chan)
{
	char buf[500], *pos, *end;
	size_t i, j;
	int ret;

	pos = buf;
	end = pos + sizeof(buf);

	for (i = 0; i < chan->reg_classes; i++) {
		const struct p2p_reg_class *c;
		c = &chan->reg_class[i];
		ret = os_snprintf(pos, end - pos, " %u:", c->reg_class);
		if (os_snprintf_error(end - pos, ret))
			break;
		pos += ret;

		for (j = 0; j < c->channels; j++) {
			ret = os_snprintf(pos, end - pos, "%s%u",
					  j == 0 ? "" : ",",
					  c->channel[j]);
			if (os_snprintf_error(end - pos, ret))
				break;
			pos += ret;
		}
	}
	*pos = '\0';

	p2p_dbg(p2p, "%s:%s", title, buf);
}

/**
 * eap_sim_db_resynchronize - Resynchronize AKA AUTN
 * @data: Private data pointer from eap_sim_db_init()
 * @username: Permanent username
 * @auts: AUTS value from the peer
 * @_rand: RAND value used in the rejected message
 * Returns: 0 on success, -1 on failure
 *
 * This function is called when the peer reports synchronization failure in the
 * AUTN value by sending AUTS. The AUTS and RAND values should be sent to
 * HLR/AuC to allow it to resynchronize with the peer. After this,
 * eap_sim_db_get_aka_auth() will be called again to to fetch updated
 * RAND/AUTN values for the next challenge.
 */
int eap_sim_db_resynchronize(struct eap_sim_db_data *data,
			     const char *username,
			     const u8 *auts, const u8 *_rand)
{
	const char *imsi;
	size_t imsi_len;

	if (username == NULL ||
	    (username[0] != EAP_AKA_PERMANENT_PREFIX &&
	     username[0] != EAP_AKA_PRIME_PERMANENT_PREFIX) ||
	    username[1] == '\0' || os_strlen(username) > 20) {
		wpa_printf(MSG_DEBUG, "EAP-SIM DB: unexpected username '%s'",
			   username);
		return -1;
	}
	imsi = username + 1;
	wpa_printf(MSG_DEBUG, "EAP-SIM DB: Get AKA auth for IMSI '%s'",
		   imsi);

	if (data->sock >= 0) {
		char msg[100];
		int len, ret;

		imsi_len = os_strlen(imsi);
		len = os_snprintf(msg, sizeof(msg), "AKA-AUTS ");
		if (os_snprintf_error(sizeof(msg), len) ||
		    len + imsi_len >= sizeof(msg))
			return -1;
		os_memcpy(msg + len, imsi, imsi_len);
		len += imsi_len;

		ret = os_snprintf(msg + len, sizeof(msg) - len, " ");
		if (os_snprintf_error(sizeof(msg) - len, ret))
			return -1;
		len += ret;
		len += wpa_snprintf_hex(msg + len, sizeof(msg) - len,
					auts, EAP_AKA_AUTS_LEN);
		ret = os_snprintf(msg + len, sizeof(msg) - len, " ");
		if (os_snprintf_error(sizeof(msg) - len, ret))
			return -1;
		len += ret;
		len += wpa_snprintf_hex(msg + len, sizeof(msg) - len,
					_rand, EAP_AKA_RAND_LEN);
		wpa_printf(MSG_DEBUG, "EAP-SIM DB: reporting AKA AUTS for "
			   "IMSI '%s'", imsi);
		if (eap_sim_db_send(data, msg, len) < 0)
			return -1;
	}

	return 0;
}

int mbo_ap_get_info(struct sta_info *sta, char *buf, size_t buflen)
{
	char *pos = buf, *end = buf + buflen;
	int ret;
	struct mbo_non_pref_chan_info *info;
	u8 i;
	unsigned int count = 0;

	if (!sta->cell_capa)
		return 0;

	ret = os_snprintf(pos, end - pos, "mbo_cell_capa=%u\n", sta->cell_capa);
	if (os_snprintf_error(end - pos, ret))
		return pos - buf;
	pos += ret;

	for (info = sta->non_pref_chan; info; info = info->next) {
		char *pos2 = pos;

		ret = os_snprintf(pos2, end - pos2,
				  "non_pref_chan[%u]=%u:%u:%u:%u:",
				  count, info->op_class, info->pref,
				  info->reason_code, info->reason_detail);
		count++;
		if (os_snprintf_error(end - pos2, ret))
			break;
		pos2 += ret;

		for (i = 0; i < info->num_channels; i++) {
			ret = os_snprintf(pos2, end - pos2, "%u%s",
					  info->channels[i],
					  i + 1 < info->num_channels ?
					  "," : "");
			if (os_snprintf_error(end - pos2, ret)) {
				pos2 = NULL;
				break;
			}
			pos2 += ret;
		}

		if (!pos2)
			break;
		ret = os_snprintf(pos2, end - pos2, "\n");
		if (os_snprintf_error(end - pos2, ret))
			break;
		pos2 += ret;
		pos = pos2;
	}

	return pos - buf;
}

static int hostapd_cli_cmd_fst(struct wpa_ctrl *ctrl, int argc, char *argv[])
{
	char cmd[256];
	int res;
	int i;
	int total;

	if (argc <= 0) {
		printf("FST command: parameters are required.\n");
		return -1;
	}

	total = os_snprintf(cmd, sizeof(cmd), "FST-MANAGER");

	for (i = 0; i < argc; i++) {
		res = os_snprintf(cmd + total, sizeof(cmd) - total, " %s",
				  argv[i]);
		if (os_snprintf_error(sizeof(cmd) - total, res)) {
			printf("Too long fst command.\n");
			return -1;
		}
		total += res;
	}
	return wpa_ctrl_command(ctrl, cmd);
}

int ap_sta_flags_txt(u32 flags, char *buf, size_t buflen)
{
	int res;

	buf[0] = '\0';
	res = os_snprintf(buf, buflen, "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
			  (flags & WLAN_STA_AUTH ? "[AUTH]" : ""),
			  (flags & WLAN_STA_ASSOC ? "[ASSOC]" : ""),
			  (flags & WLAN_STA_AUTHORIZED ? "[AUTHORIZED]" : ""),
			  (flags & WLAN_STA_PENDING_POLL ? "[PENDING_POLL" :
			   ""),
			  (flags & WLAN_STA_SHORT_PREAMBLE ?
			   "[SHORT_PREAMBLE]" : ""),
			  (flags & WLAN_STA_PREAUTH ? "[PREAUTH]" : ""),
			  (flags & WLAN_STA_WMM ? "[WMM]" : ""),
			  (flags & WLAN_STA_MFP ? "[MFP]" : ""),
			  (flags & WLAN_STA_WPS ? "[WPS]" : ""),
			  (flags & WLAN_STA_MAYBE_WPS ? "[MAYBE_WPS]" : ""),
			  (flags & WLAN_STA_WDS ? "[WDS]" : ""),
			  (flags & WLAN_STA_NONERP ? "[NonERP]" : ""),
			  (flags & WLAN_STA_WPS2 ? "[WPS2]" : ""),
			  (flags & WLAN_STA_GAS ? "[GAS]" : ""),
			  (flags & WLAN_STA_VHT ? "[VHT]" : ""),
			  (flags & WLAN_STA_VENDOR_VHT ? "[VENDOR_VHT]" : ""),
			  (flags & WLAN_STA_WNM_SLEEP_MODE ?
			   "[WNM_SLEEP_MODE]" : ""));
	if (os_snprintf_error(buflen, res))
		res = -1;

	return res;
}

int ap_ctrl_iface_wpa_get_status(struct wpa_supplicant *wpa_s, char *buf,
				 size_t buflen, int verbose)
{
	char *pos = buf, *end = buf + buflen;
	int ret;
	struct hostapd_bss_config *conf;

	if (wpa_s->ap_iface == NULL)
		return -1;

	conf = wpa_s->ap_iface->bss[0]->conf;
	if (conf->wpa == 0)
		return 0;

	ret = os_snprintf(pos, end - pos,
			  "pairwise_cipher=%s\n"
			  "group_cipher=%s\n"
			  "key_mgmt=%s\n",
			  wpa_cipher_txt(conf->rsn_pairwise),
			  wpa_cipher_txt(conf->wpa_group),
			  wpa_key_mgmt_txt(conf->wpa_key_mgmt,
					   conf->wpa));
	if (os_snprintf_error(end - pos, ret))
		return pos - buf;
	pos += ret;
	return pos - buf;
}

static int is_signature_correct(DBusMessage *message,
				const struct wpa_dbus_method_desc *method_dsc)
{
	/* According to DBus documentation max length of signature is 255 */
#define MAX_SIG_LEN 256
	char registered_sig[MAX_SIG_LEN], *pos;
	const char *sig = dbus_message_get_signature(message);
	int ret;
	const struct wpa_dbus_argument *arg;

	pos = registered_sig;
	*pos = '\0';

	for (arg = method_dsc->args; arg && arg->name; arg++) {
		if (arg->dir == ARG_IN) {
			size_t blen = registered_sig + MAX_SIG_LEN - pos;

			ret = os_snprintf(pos, blen, "%s", arg->type);
			if (os_snprintf_error(blen, ret))
				return 0;
			pos += ret;
		}
	}

	return !os_strncmp(registered_sig, sig, MAX_SIG_LEN);
}

void wpas_send_ctrl_req(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid,
			const char *field_name, const char *txt)
{
	char *buf;
	size_t buflen;
	int len;

	buflen = 100 + os_strlen(txt) + ssid->ssid_len;
	buf = os_malloc(buflen);
	if (buf == NULL)
		return;
	len = os_snprintf(buf, buflen, "%s-%d:%s needed for SSID ",
			  field_name, ssid->id, txt);
	if (os_snprintf_error(buflen, len)) {
		os_free(buf);
		return;
	}
	if (ssid->ssid && buflen > len + ssid->ssid_len) {
		os_memcpy(buf + len, ssid->ssid, ssid->ssid_len);
		len += ssid->ssid_len;
		buf[len] = '\0';
	}
	buf[buflen - 1] = '\0';
	wpa_msg(wpa_s, MSG_INFO, WPA_CTRL_REQ "%s", buf);
	os_free(buf);
}

/**
 * pmksa_cache_auth_list_mesh - Dump text list of entries in PMKSA cache
 * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init()
 * @addr: MAC address of the peer (NULL means any)
 * @buf: Buffer for the list
 * @len: Length of the buffer
 * Returns: Number of bytes written to buffer
 *
 * This function is used to generate a text format representation of the
 * current PMKSA cache contents for the ctrl_iface PMKSA_GET command to store
 * in external storage.
 */
int pmksa_cache_auth_list_mesh(struct rsn_pmksa_cache *pmksa, const u8 *addr,
			       char *buf, size_t len)
{
	int ret;
	char *pos, *end;
	struct rsn_pmksa_cache_entry *entry;
	struct os_reltime now;

	pos = buf;
	end = buf + len;
	os_get_reltime(&now);


	/*
	 * Entry format:
	 * <BSSID> <PMKID> <PMK> <expiration in seconds>
	 */
	for (entry = pmksa->pmksa; entry; entry = entry->next) {
		if (addr && os_memcmp(entry->spa, addr, ETH_ALEN) != 0)
			continue;

		ret = os_snprintf(pos, end - pos, MACSTR " ",
				  MAC2STR(entry->spa));
		if (os_snprintf_error(end - pos, ret))
			return 0;
		pos += ret;

		pos += wpa_snprintf_hex(pos, end - pos, entry->pmkid,
					PMKID_LEN);

		ret = os_snprintf(pos, end - pos, " ");
		if (os_snprintf_error(end - pos, ret))
			return 0;
		pos += ret;

		pos += wpa_snprintf_hex(pos, end - pos, entry->pmk,
					entry->pmk_len);

		ret = os_snprintf(pos, end - pos, " %d\n",
				  (int) (entry->expiration - now.sec));
		if (os_snprintf_error(end - pos, ret))
			return 0;
		pos += ret;
	}

	return pos - buf;
}

struct wpa_ctrl * wpa_ctrl_open(const char *ctrl_path)
{
	struct wpa_ctrl *ctrl;
	DWORD mode;
	TCHAR name[256];
	int i, ret;

	ctrl = os_malloc(sizeof(*ctrl));
	if (ctrl == NULL)
		return NULL;
	os_memset(ctrl, 0, sizeof(*ctrl));

#ifdef UNICODE
	if (ctrl_path == NULL)
		ret = _snwprintf(name, 256, NAMED_PIPE_PREFIX);
	else
		ret = _snwprintf(name, 256, NAMED_PIPE_PREFIX TEXT("-%S"),
				 ctrl_path);
#else /* UNICODE */
	if (ctrl_path == NULL)
		ret = os_snprintf(name, 256, NAMED_PIPE_PREFIX);
	else
		ret = os_snprintf(name, 256, NAMED_PIPE_PREFIX "-%s",
				  ctrl_path);
#endif /* UNICODE */
	if (os_snprintf_error(256, ret)) {
		os_free(ctrl);
		return NULL;
	}

	for (i = 0; i < 10; i++) {
		ctrl->pipe = CreateFile(name, GENERIC_READ | GENERIC_WRITE, 0,
					NULL, OPEN_EXISTING, 0, NULL);
		/*
		 * Current named pipe server side in wpa_supplicant is
		 * re-opening the pipe for new clients only after the previous
		 * one is taken into use. This leaves a small window for race
		 * conditions when two connections are being opened at almost
		 * the same time. Retry if that was the case.
		 */
		if (ctrl->pipe != INVALID_HANDLE_VALUE ||
		    GetLastError() != ERROR_PIPE_BUSY)
			break;
		WaitNamedPipe(name, 1000);
	}
	if (ctrl->pipe == INVALID_HANDLE_VALUE) {
		os_free(ctrl);
		return NULL;
	}

	mode = PIPE_READMODE_MESSAGE;
	if (!SetNamedPipeHandleState(ctrl->pipe, &mode, NULL, NULL)) {
		CloseHandle(ctrl->pipe);
		os_free(ctrl);
		return NULL;
	}

	return ctrl;
}

static int wpas_mesh_get_ifname(struct wpa_supplicant *wpa_s, char *ifname,
				size_t len)
{
	char *ifname_ptr = wpa_s->ifname;
	int res;

	res = os_snprintf(ifname, len, "mesh-%s-%d", ifname_ptr,
			  wpa_s->mesh_if_idx);
	if (os_snprintf_error(len, res) ||
	    (os_strlen(ifname) >= IFNAMSIZ &&
	     os_strlen(wpa_s->ifname) < IFNAMSIZ)) {
		/* Try to avoid going over the IFNAMSIZ length limit */
		res = os_snprintf(ifname, len, "mesh-%d", wpa_s->mesh_if_idx);
		if (os_snprintf_error(len, res))
			return -1;
	}
	wpa_s->mesh_if_idx++;
	return 0;
}