/*
* UPnP WPS Device
* Copyright (c) 2000-2003 Intel Corporation
* Copyright (c) 2006-2007 Sony Corporation
* Copyright (c) 2008-2009 Atheros Communications
* Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi>
*
* See below for more details on licensing and code history.
*/
/*
* This has been greatly stripped down from the original file
* (upnp_wps_device.c) by Ted Merrill, Atheros Communications
* in order to eliminate use of the bulky libupnp library etc.
*
* History:
* upnp_wps_device.c is/was a shim layer between wps_opt_upnp.c and
* the libupnp library.
* The layering (by Sony) was well done; only a very minor modification
* to API of upnp_wps_device.c was required.
* libupnp was found to be undesirable because:
* -- It consumed too much code and data space
* -- It uses multiple threads, making debugging more difficult
* and possibly reducing reliability.
* -- It uses static variables and only supports one instance.
* The shim and libupnp are here replaced by special code written
* specifically for the needs of hostapd.
* Various shortcuts can and are taken to keep the code size small.
* Generally, execution time is not as crucial.
*
* BUGS:
* -- UPnP requires that we be able to resolve domain names.
* While uncommon, if we have to do it then it will stall the entire
* hostapd program, which is bad.
* This is because we use the standard linux getaddrinfo() function
* which is syncronous.
* An asyncronous solution would be to use the free "ares" library.
* -- Does not have a robust output buffering scheme. Uses a single
* fixed size output buffer per TCP/HTTP connection, with possible (although
* unlikely) possibility of overflow and likely excessive use of RAM.
* A better solution would be to write the HTTP output as a buffered stream,
* using chunking: (handle header specially, then) generate data with
* a printf-like function into a buffer, catching buffer full condition,
* then send it out surrounded by http chunking.
* -- There is some code that could be separated out into the common
* library to be shared with wpa_supplicant.
* -- Needs renaming with module prefix to avoid polluting the debugger
* namespace and causing possible collisions with other static fncs
* and structure declarations when using the debugger.
* -- The http error code generation is pretty bogus, hopefully no one cares.
*
* Author: Ted Merrill, Atheros Communications, based upon earlier work
* as explained above and below.
*
* Copyright:
* Copyright 2008 Atheros Communications.
*
* The original header (of upnp_wps_device.c) reads:
*
* Copyright (c) 2006-2007 Sony Corporation. All Rights Reserved.
*
* File Name: upnp_wps_device.c
* Description: EAP-WPS UPnP device source
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Sony Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Portions from Intel libupnp files, e.g. genlib/net/http/httpreadwrite.c
* typical header:
*
* Copyright (c) 2000-2003 Intel Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Overview of WPS over UPnP:
*
* UPnP is a protocol that allows devices to discover each other and control
* each other. In UPnP terminology, a device is either a "device" (a server
* that provides information about itself and allows itself to be controlled)
* or a "control point" (a client that controls "devices") or possibly both.
* This file implements a UPnP "device".
*
* For us, we use mostly basic UPnP discovery, but the control part of interest
* is WPS carried via UPnP messages. There is quite a bit of basic UPnP
* discovery to do before we can get to WPS, however.
*
* UPnP discovery begins with "devices" send out multicast UDP packets to a
* certain fixed multicast IP address and port, and "control points" sending
* out other such UDP packets.
*
* The packets sent by devices are NOTIFY packets (not to be confused with TCP
* NOTIFY packets that are used later) and those sent by control points are
* M-SEARCH packets. These packets contain a simple HTTP style header. The
* packets are sent redundantly to get around packet loss. Devices respond to
* M-SEARCH packets with HTTP-like UDP packets containing HTTP/1.1 200 OK
* messages, which give similar information as the UDP NOTIFY packets.
*
* The above UDP packets advertise the (arbitrary) TCP ports that the
* respective parties will listen to. The control point can then do a HTTP
* SUBSCRIBE (something like an HTTP PUT) after which the device can do a
* separate HTTP NOTIFY (also like an HTTP PUT) to do event messaging.
*
* The control point will also do HTTP GET of the "device file" listed in the
* original UDP information from the device (see UPNP_WPS_DEVICE_XML_FILE
* data), and based on this will do additional GETs... HTTP POSTs are done to
* cause an action.
*
* Beyond some basic information in HTTP headers, additional information is in
* the HTTP bodies, in a format set by the SOAP and XML standards, a markup
* language related to HTML used for web pages. This language is intended to
* provide the ultimate in self-documentation by providing a universal
* namespace based on pseudo-URLs called URIs. Note that although a URI looks
* like a URL (a web address), they are never accessed as such but are used
* only as identifiers.
*
* The POST of a GetDeviceInfo gets information similar to what might be
* obtained from a probe request or response on Wi-Fi. WPS messages M1-M8
* are passed via a POST of a PutMessage; the M1-M8 WPS messages are converted
* to a bin64 ascii representation for encapsulation. When proxying messages,
* WLANEvent and PutWLANResponse are used.
*
* This of course glosses over a lot of details.
*/
#include "includes.h"
#include <time.h>
#include <net/if.h>
#include <netdb.h>
#include <sys/ioctl.h>
#include "common.h"
#include "uuid.h"
#include "base64.h"
#include "wps.h"
#include "wps_i.h"
#include "wps_upnp.h"
#include "wps_upnp_i.h"
/*
* UPnP allows a client ("control point") to send a server like us ("device")
* a domain name for registration, and we are supposed to resolve it. This is
* bad because, using the standard Linux library, we will stall the entire
* hostapd waiting for resolution.
*
* The "correct" solution would be to use an event driven library for domain
* name resolution such as "ares". However, this would increase code size
* further. Since it is unlikely that we'll actually see such domain names, we
* can just refuse to accept them.
*/
#define NO_DOMAIN_NAME_RESOLUTION 1 /* 1 to allow only dotted ip addresses */
/*
* UPnP does not scale well. If we were in a room with thousands of control
* points then potentially we could be expected to handle subscriptions for
* each of them, which would exhaust our memory. So we must set a limit. In
* practice we are unlikely to see more than one or two.
*/
#define MAX_SUBSCRIPTIONS 4 /* how many subscribing clients we handle */
#define MAX_ADDR_PER_SUBSCRIPTION 8
/* Maximum number of Probe Request events per second */
#define MAX_EVENTS_PER_SEC 5
static struct upnp_wps_device_sm *shared_upnp_device = NULL;
/* Write the current date/time per RFC */
void format_date(struct wpabuf *buf)
{
const char *weekday_str = "Sun\0Mon\0Tue\0Wed\0Thu\0Fri\0Sat";
const char *month_str = "Jan\0Feb\0Mar\0Apr\0May\0Jun\0"
"Jul\0Aug\0Sep\0Oct\0Nov\0Dec";
struct tm *date;
time_t t;
t = time(NULL);
date = gmtime(&t);
if (date == NULL)
return;
wpabuf_printf(buf, "%s, %02d %s %d %02d:%02d:%02d GMT",
&weekday_str[date->tm_wday * 4], date->tm_mday,
&month_str[date->tm_mon * 4], date->tm_year + 1900,
date->tm_hour, date->tm_min, date->tm_sec);
}
/***************************************************************************
* UUIDs (unique identifiers)
*
* These are supposed to be unique in all the world.
* Sometimes permanent ones are used, sometimes temporary ones
* based on random numbers... there are different rules for valid content
* of different types.
* Each uuid is 16 bytes long.
**************************************************************************/
/* uuid_make -- construct a random UUID
* The UPnP documents don't seem to offer any guidelines as to which method to
* use for constructing UUIDs for subscriptions. Presumably any method from
* rfc4122 is good enough; I've chosen random number method.
*/
static int uuid_make(u8 uuid[UUID_LEN])
{
if (os_get_random(uuid, UUID_LEN) < 0)
return -1;
/* Replace certain bits as specified in rfc4122 or X.667 */
uuid[6] &= 0x0f; uuid[6] |= (4 << 4); /* version 4 == random gen */
uuid[8] &= 0x3f; uuid[8] |= 0x80;
return 0;
}
/*
* Subscriber address handling.
* Since a subscriber may have an arbitrary number of addresses, we have to
* add a bunch of code to handle them.
*
* Addresses are passed in text, and MAY be domain names instead of the (usual
* and expected) dotted IP addresses. Resolving domain names consumes a lot of
* resources. Worse, we are currently using the standard Linux getaddrinfo()
* which will block the entire program until complete or timeout! The proper
* solution would be to use the "ares" library or similar with more state
* machine steps etc. or just disable domain name resolution by setting
* NO_DOMAIN_NAME_RESOLUTION to 1 at top of this file.
*/
/* subscr_addr_delete -- delete single unlinked subscriber address
* (be sure to unlink first if need be)
*/
void subscr_addr_delete(struct subscr_addr *a)
{
/*
* Note: do NOT free domain_and_port or path because they point to
* memory within the allocation of "a".
*/
os_free(a);
}
/* subscr_addr_free_all -- unlink and delete list of subscriber addresses. */
static void subscr_addr_free_all(struct subscription *s)
{
struct subscr_addr *a, *tmp;
dl_list_for_each_safe(a, tmp, &s->addr_list, struct subscr_addr, list)
{
dl_list_del(&a->list);
subscr_addr_delete(a);
}
}
/* subscr_addr_add_url -- add address(es) for one url to subscription */
static void subscr_addr_add_url(struct subscription *s, const char *url,
size_t url_len)
{
int alloc_len;
char *scratch_mem = NULL;
char *mem;
char *host;
char *delim;
char *path;
int port = 80; /* port to send to (default is port 80) */
struct addrinfo hints;
struct addrinfo *result = NULL;
struct addrinfo *rp;
int rerr;
size_t host_len, path_len;
/* url MUST begin with http: */
if (url_len < 7 || os_strncasecmp(url, "http://", 7))
goto fail;
url += 7;
url_len -= 7;
/* Make a copy of the string to allow modification during parsing */
scratch_mem = dup_binstr(url, url_len);
if (scratch_mem == NULL)
goto fail;
wpa_printf(MSG_DEBUG, "WPS UPnP: Adding URL '%s'", scratch_mem);
host = scratch_mem;
path = os_strchr(host, '/');
if (path)
*path++ = '\0'; /* null terminate host */
/* Process and remove optional port component */
delim = os_strchr(host, ':');
if (delim) {
*delim = '\0'; /* null terminate host name for now */
if (isdigit(delim[1]))
port = atol(delim + 1);
}
/*
* getaddrinfo does the right thing with dotted decimal notations, or
* will resolve domain names. Resolving domain names will unfortunately
* hang the entire program until it is resolved or it times out
* internal to getaddrinfo; fortunately we think that the use of actual
* domain names (vs. dotted decimal notations) should be uncommon.
*/
os_memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_INET; /* IPv4 */
hints.ai_socktype = SOCK_STREAM;
#if NO_DOMAIN_NAME_RESOLUTION
/* Suppress domain name resolutions that would halt
* the program for periods of time
*/
hints.ai_flags = AI_NUMERICHOST;
#else
/* Allow domain name resolution. */
hints.ai_flags = 0;
#endif
hints.ai_protocol = 0; /* Any protocol? */
rerr = getaddrinfo(host, NULL /* fill in port ourselves */,
&hints, &result);
if (rerr) {
wpa_printf(MSG_INFO, "WPS UPnP: Resolve error %d (%s) on: %s",
rerr, gai_strerror(rerr), host);
goto fail;
}
if (delim)
*delim = ':'; /* Restore port */
host_len = os_strlen(host);
path_len = path ? os_strlen(path) : 0;
alloc_len = host_len + 1 + 1 + path_len + 1;
for (rp = result; rp; rp = rp->ai_next) {
struct subscr_addr *a;
/* Limit no. of address to avoid denial of service attack */
if (dl_list_len(&s->addr_list) >= MAX_ADDR_PER_SUBSCRIPTION) {
wpa_printf(MSG_INFO, "WPS UPnP: subscr_addr_add_url: "
"Ignoring excessive addresses");
break;
}
a = os_zalloc(sizeof(*a) + alloc_len);
if (a == NULL)
break;
mem = (char *) (a + 1);
a->domain_and_port = mem;
os_memcpy(mem, host, host_len);
mem += host_len + 1;
a->path = mem;
if (path == NULL || path[0] != '/')
*mem++ = '/';
if (path)
os_memcpy(mem, path, path_len);
os_memcpy(&a->saddr, rp->ai_addr, sizeof(a->saddr));
a->saddr.sin_port = htons(port);
dl_list_add(&s->addr_list, &a->list);
}
fail:
if (result)
freeaddrinfo(result);
os_free(scratch_mem);
}
/* subscr_addr_list_create -- create list from urls in string.
* Each url is enclosed by angle brackets.
*/
static void subscr_addr_list_create(struct subscription *s,
const char *url_list)
{
const char *end;
wpa_printf(MSG_DEBUG, "WPS UPnP: Parsing URL list '%s'", url_list);
for (;;) {
while (*url_list == ' ' || *url_list == '\t')
url_list++;
if (*url_list != '<')
break;
url_list++;
end = os_strchr(url_list, '>');
if (end == NULL)
break;
subscr_addr_add_url(s, url_list, end - url_list);
url_list = end + 1;
}
}
static void wpabuf_put_property(struct wpabuf *buf, const char *name,
const char *value)
{
wpabuf_put_str(buf, "<e:property>");
wpabuf_printf(buf, "<%s>", name);
if (value)
wpabuf_put_str(buf, value);
wpabuf_printf(buf, "</%s>", name);
wpabuf_put_str(buf, "</e:property>\n");
}
/**
* upnp_wps_device_send_event - Queue event messages for subscribers
* @sm: WPS UPnP state machine from upnp_wps_device_init()
*
* This function queues the last WLANEvent to be sent for all currently
* subscribed UPnP control points. sm->wlanevent must have been set with the
* encoded data before calling this function.
*/
static void upnp_wps_device_send_event(struct upnp_wps_device_sm *sm)
{
/* Enqueue event message for all subscribers */
struct wpabuf *buf; /* holds event message */
int buf_size = 0;
struct subscription *s, *tmp;
/* Actually, utf-8 is the default, but it doesn't hurt to specify it */
const char *format_head =
"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
"<e:propertyset xmlns:e=\"urn:schemas-upnp-org:event-1-0\">\n";
const char *format_tail = "</e:propertyset>\n";
struct os_reltime now;
if (dl_list_empty(&sm->subscriptions)) {
/* optimize */
return;
}
if (os_get_reltime(&now) == 0) {
if (now.sec != sm->last_event_sec) {
sm->last_event_sec = now.sec;
sm->num_events_in_sec = 1;
} else {
sm->num_events_in_sec++;
/*
* In theory, this should apply to all WLANEvent
* notifications, but EAP messages are of much higher
* priority and Probe Request notifications should not
* be allowed to drop EAP messages, so only throttle
* Probe Request notifications.
*/
if (sm->num_events_in_sec > MAX_EVENTS_PER_SEC &&
sm->wlanevent_type ==
UPNP_WPS_WLANEVENT_TYPE_PROBE) {
wpa_printf(MSG_DEBUG, "WPS UPnP: Throttle "
"event notifications (%u seen "
"during one second)",
sm->num_events_in_sec);
return;
}
}
}
/* Determine buffer size needed first */
buf_size += os_strlen(format_head);
buf_size += 50 + 2 * os_strlen("WLANEvent");
if (sm->wlanevent)
buf_size += os_strlen(sm->wlanevent);
buf_size += os_strlen(format_tail);
buf = wpabuf_alloc(buf_size);
if (buf == NULL)
return;
wpabuf_put_str(buf, format_head);
wpabuf_put_property(buf, "WLANEvent", sm->wlanevent);
wpabuf_put_str(buf, format_tail);
wpa_printf(MSG_MSGDUMP, "WPS UPnP: WLANEvent message:\n%s",
(char *) wpabuf_head(buf));
dl_list_for_each_safe(s, tmp, &sm->subscriptions, struct subscription,
list) {
event_add(s, buf,
sm->wlanevent_type == UPNP_WPS_WLANEVENT_TYPE_PROBE);
}
wpabuf_free(buf);
}
/*
* Event subscription (subscriber machines register with us to receive event
* messages).
* This is the result of an incoming HTTP over TCP SUBSCRIBE request.
*/
/* subscription_destroy -- destroy an unlinked subscription
* Be sure to unlink first if necessary.
*/
void subscription_destroy(struct subscription *s)
{
struct upnp_wps_device_interface *iface;
wpa_printf(MSG_DEBUG, "WPS UPnP: Destroy subscription %p", s);
subscr_addr_free_all(s);
event_delete_all(s);
dl_list_for_each(iface, &s->sm->interfaces,
struct upnp_wps_device_interface, list)
upnp_er_remove_notification(iface->wps->registrar, s);
os_free(s);
}
/* subscription_list_age -- remove expired subscriptions */
static void subscription_list_age(struct upnp_wps_device_sm *sm, time_t now)
{
struct subscription *s, *tmp;
dl_list_for_each_safe(s, tmp, &sm->subscriptions,
struct subscription, list) {
if (s->timeout_time > now)
break;
wpa_printf(MSG_DEBUG, "WPS UPnP: Removing aged subscription");
dl_list_del(&s->list);
subscription_destroy(s);
}
}
/* subscription_find -- return existing subscription matching uuid, if any
* returns NULL if not found
*/
struct subscription * subscription_find(struct upnp_wps_device_sm *sm,
const u8 uuid[UUID_LEN])
{
struct subscription *s;
dl_list_for_each(s, &sm->subscriptions, struct subscription, list) {
if (os_memcmp(s->uuid, uuid, UUID_LEN) == 0)
return s; /* Found match */
}
return NULL;
}
static struct wpabuf * build_fake_wsc_ack(void)
{
struct wpabuf *msg = wpabuf_alloc(100);
if (msg == NULL)
return NULL;
wpabuf_put_u8(msg, UPNP_WPS_WLANEVENT_TYPE_EAP);
wpabuf_put_str(msg, "00:00:00:00:00:00");
if (wps_build_version(msg) ||
wps_build_msg_type(msg, WPS_WSC_ACK)) {
wpabuf_free(msg);
return NULL;
}
/* Enrollee Nonce */
wpabuf_put_be16(msg, ATTR_ENROLLEE_NONCE);
wpabuf_put_be16(msg, WPS_NONCE_LEN);
wpabuf_put(msg, WPS_NONCE_LEN);
/* Registrar Nonce */
wpabuf_put_be16(msg, ATTR_REGISTRAR_NONCE);
wpabuf_put_be16(msg, WPS_NONCE_LEN);
wpabuf_put(msg, WPS_NONCE_LEN);
if (wps_build_wfa_ext(msg, 0, NULL, 0)) {
wpabuf_free(msg);
return NULL;
}
return msg;
}
/* subscription_first_event -- send format/queue event that is automatically
* sent on a new subscription.
*/
static int subscription_first_event(struct subscription *s)
{
/*
* Actually, utf-8 is the default, but it doesn't hurt to specify it.
*
* APStatus is apparently a bit set,
* 0x1 = configuration change (but is always set?)
* 0x10 = ap is locked
*
* Per UPnP spec, we send out the last value of each variable, even
* for WLANEvent, whatever it was.
*/
char *wlan_event;
struct wpabuf *buf;
int ap_status = 1; /* TODO: add 0x10 if access point is locked */
const char *head =
"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
"<e:propertyset xmlns:e=\"urn:schemas-upnp-org:event-1-0\">\n";
const char *tail = "</e:propertyset>\n";
char txt[10];
int ret;
if (s->sm->wlanevent == NULL) {
/*
* There has been no events before the subscription. However,
* UPnP device architecture specification requires all the
* evented variables to be included, so generate a dummy event
* for this particular case using a WSC_ACK and all-zeros
* nonces. The ER (UPnP control point) will ignore this, but at
* least it will learn that WLANEvent variable will be used in
* event notifications in the future.
*/
struct wpabuf *msg;
wpa_printf(MSG_DEBUG, "WPS UPnP: Use a fake WSC_ACK as the "
"initial WLANEvent");
msg = build_fake_wsc_ack();
if (msg) {
s->sm->wlanevent = (char *)
base64_encode(wpabuf_head(msg),
wpabuf_len(msg), NULL);
wpabuf_free(msg);
}
}
wlan_event = s->sm->wlanevent;
if (wlan_event == NULL || *wlan_event == '\0') {
wpa_printf(MSG_DEBUG, "WPS UPnP: WLANEvent not known for "
"initial event message");
wlan_event = "";
}
buf = wpabuf_alloc(500 + os_strlen(wlan_event));
if (buf == NULL)
return -1;
wpabuf_put_str(buf, head);
wpabuf_put_property(buf, "STAStatus", "1");
os_snprintf(txt, sizeof(txt), "%d", ap_status);
wpabuf_put_property(buf, "APStatus", txt);
if (*wlan_event)
wpabuf_put_property(buf, "WLANEvent", wlan_event);
wpabuf_put_str(buf, tail);
ret = event_add(s, buf, 0);
if (ret) {
wpabuf_free(buf);
return ret;
}
wpabuf_free(buf);
return 0;
}
/**
* subscription_start - Remember a UPnP control point to send events to.
* @sm: WPS UPnP state machine from upnp_wps_device_init()
* @callback_urls: Callback URLs
* Returns: %NULL on error, or pointer to new subscription structure.
*/
struct subscription * subscription_start(struct upnp_wps_device_sm *sm,
const char *callback_urls)
{
struct subscription *s;
time_t now = time(NULL);
time_t expire = now + UPNP_SUBSCRIBE_SEC;
/* Get rid of expired subscriptions so we have room */
subscription_list_age(sm, now);
/* If too many subscriptions, remove oldest */
if (dl_list_len(&sm->subscriptions) >= MAX_SUBSCRIPTIONS) {
s = dl_list_first(&sm->subscriptions, struct subscription,
list);
if (s) {
wpa_printf(MSG_INFO,
"WPS UPnP: Too many subscriptions, trashing oldest");
dl_list_del(&s->list);
subscription_destroy(s);
}
}
s = os_zalloc(sizeof(*s));
if (s == NULL)
return NULL;
dl_list_init(&s->addr_list);
dl_list_init(&s->event_queue);
s->sm = sm;
s->timeout_time = expire;
if (uuid_make(s->uuid) < 0) {
subscription_destroy(s);
return NULL;
}
subscr_addr_list_create(s, callback_urls);
if (dl_list_empty(&s->addr_list)) {
wpa_printf(MSG_DEBUG, "WPS UPnP: No valid callback URLs in "
"'%s' - drop subscription", callback_urls);
subscription_destroy(s);
return NULL;
}
/* Add to end of list, since it has the highest expiration time */
dl_list_add_tail(&sm->subscriptions, &s->list);
/* Queue up immediate event message (our last event)
* as required by UPnP spec.
*/
if (subscription_first_event(s)) {
wpa_printf(MSG_INFO, "WPS UPnP: Dropping subscriber due to "
"event backlog");
dl_list_del(&s->list);
subscription_destroy(s);
return NULL;
}
wpa_printf(MSG_DEBUG, "WPS UPnP: Subscription %p started with %s",
s, callback_urls);
/* Schedule sending this */
event_send_all_later(sm);
return s;
}
/* subscription_renew -- find subscription and reset timeout */
struct subscription * subscription_renew(struct upnp_wps_device_sm *sm,
const u8 uuid[UUID_LEN])
{
time_t now = time(NULL);
time_t expire = now + UPNP_SUBSCRIBE_SEC;
struct subscription *s = subscription_find(sm, uuid);
if (s == NULL)
return NULL;
wpa_printf(MSG_DEBUG, "WPS UPnP: Subscription renewed");
dl_list_del(&s->list);
s->timeout_time = expire;
/* add back to end of list, since it now has highest expiry */
dl_list_add_tail(&sm->subscriptions, &s->list);
return s;
}
/**
* upnp_wps_device_send_wlan_event - Event notification
* @sm: WPS UPnP state machine from upnp_wps_device_init()
* @from_mac_addr: Source (Enrollee) MAC address for the event
* @ev_type: Event type
* @msg: Event data
* Returns: 0 on success, -1 on failure
*
* Tell external Registrars (UPnP control points) that something happened. In
* particular, events include WPS messages from clients that are proxied to
* external Registrars.
*/
int upnp_wps_device_send_wlan_event(struct upnp_wps_device_sm *sm,
const u8 from_mac_addr[ETH_ALEN],
enum upnp_wps_wlanevent_type ev_type,
const struct wpabuf *msg)
{
int ret = -1;
char type[2];
const u8 *mac = from_mac_addr;
char mac_text[18];
u8 *raw = NULL;
size_t raw_len;
char *val;
size_t val_len;
int pos = 0;
if (!sm)
goto fail;
os_snprintf(type, sizeof(type), "%1u", ev_type);
raw_len = 1 + 17 + (msg ? wpabuf_len(msg) : 0);
raw = os_zalloc(raw_len);
if (!raw)
goto fail;
*(raw + pos) = (u8) ev_type;
pos += 1;
os_snprintf(mac_text, sizeof(mac_text), MACSTR, MAC2STR(mac));
wpa_printf(MSG_DEBUG, "WPS UPnP: Proxying WLANEvent from %s",
mac_text);
os_memcpy(raw + pos, mac_text, 17);
pos += 17;
if (msg) {
os_memcpy(raw + pos, wpabuf_head(msg), wpabuf_len(msg));
pos += wpabuf_len(msg);
}
raw_len = pos;
val = (char *) base64_encode(raw, raw_len, &val_len);
if (val == NULL)
goto fail;
os_free(sm->wlanevent);
sm->wlanevent = val;
sm->wlanevent_type = ev_type;
upnp_wps_device_send_event(sm);
ret = 0;
fail:
os_free(raw);
return ret;
}
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#include <sys/sysctl.h>
#include <net/route.h>
#include <net/if_dl.h>
static int eth_get(const char *device, u8 ea[ETH_ALEN])
{
struct if_msghdr *ifm;
struct sockaddr_dl *sdl;
u_char *p, *buf;
size_t len;
int mib[] = { CTL_NET, AF_ROUTE, 0, AF_LINK, NET_RT_IFLIST, 0 };
if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
return -1;
if ((buf = os_malloc(len)) == NULL)
return -1;
if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
os_free(buf);
return -1;
}
for (p = buf; p < buf + len; p += ifm->ifm_msglen) {
ifm = (struct if_msghdr *)p;
sdl = (struct sockaddr_dl *)(ifm + 1);
if (ifm->ifm_type != RTM_IFINFO ||
(ifm->ifm_addrs & RTA_IFP) == 0)
continue;
if (sdl->sdl_family != AF_LINK || sdl->sdl_nlen == 0 ||
os_memcmp(sdl->sdl_data, device, sdl->sdl_nlen) != 0)
continue;
os_memcpy(ea, LLADDR(sdl), sdl->sdl_alen);
break;
}
os_free(buf);
if (p >= buf + len) {
errno = ESRCH;
return -1;
}
return 0;
}
#endif /* __FreeBSD__ */
/**
* get_netif_info - Get hw and IP addresses for network device
* @net_if: Selected network interface name
* @ip_addr: Buffer for returning IP address in network byte order
* @ip_addr_text: Buffer for returning a pointer to allocated IP address text
* @mac: Buffer for returning MAC address
* Returns: 0 on success, -1 on failure
*/
int get_netif_info(const char *net_if, unsigned *ip_addr, char **ip_addr_text,
u8 mac[ETH_ALEN])
{
struct ifreq req;
int sock = -1;
struct sockaddr_in *addr;
struct in_addr in_addr;
*ip_addr_text = os_zalloc(16);
if (*ip_addr_text == NULL)
goto fail;
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0)
goto fail;
os_strlcpy(req.ifr_name, net_if, sizeof(req.ifr_name));
if (ioctl(sock, SIOCGIFADDR, &req) < 0) {
wpa_printf(MSG_ERROR, "WPS UPnP: SIOCGIFADDR failed: %d (%s)",
errno, strerror(errno));
goto fail;
}
addr = (void *) &req.ifr_addr;
*ip_addr = addr->sin_addr.s_addr;
in_addr.s_addr = *ip_addr;
os_snprintf(*ip_addr_text, 16, "%s", inet_ntoa(in_addr));
#ifdef __linux__
os_strlcpy(req.ifr_name, net_if, sizeof(req.ifr_name));
if (ioctl(sock, SIOCGIFHWADDR, &req) < 0) {
wpa_printf(MSG_ERROR, "WPS UPnP: SIOCGIFHWADDR failed: "
"%d (%s)", errno, strerror(errno));
goto fail;
}
os_memcpy(mac, req.ifr_addr.sa_data, 6);
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
if (eth_get(net_if, mac) < 0) {
wpa_printf(MSG_ERROR, "WPS UPnP: Failed to get MAC address");
goto fail;
}
#else
#error MAC address fetch not implemented
#endif
close(sock);
return 0;
fail:
if (sock >= 0)
close(sock);
os_free(*ip_addr_text);
*ip_addr_text = NULL;
return -1;
}
static void upnp_wps_free_msearchreply(struct dl_list *head)
{
struct advertisement_state_machine *a, *tmp;
dl_list_for_each_safe(a, tmp, head, struct advertisement_state_machine,
list)
msearchreply_state_machine_stop(a);
}
static void upnp_wps_free_subscriptions(struct dl_list *head,
struct wps_registrar *reg)
{
struct subscription *s, *tmp;
dl_list_for_each_safe(s, tmp, head, struct subscription, list) {
if (reg && s->reg != reg)
continue;
dl_list_del(&s->list);
subscription_destroy(s);
}
}
/**
* upnp_wps_device_stop - Stop WPS UPnP operations on an interface
* @sm: WPS UPnP state machine from upnp_wps_device_init()
*/
static void upnp_wps_device_stop(struct upnp_wps_device_sm *sm)
{
if (!sm || !sm->started)
return;
wpa_printf(MSG_DEBUG, "WPS UPnP: Stop device");
web_listener_stop(sm);
ssdp_listener_stop(sm);
upnp_wps_free_msearchreply(&sm->msearch_replies);
upnp_wps_free_subscriptions(&sm->subscriptions, NULL);
advertisement_state_machine_stop(sm, 1);
event_send_stop_all(sm);
os_free(sm->wlanevent);
sm->wlanevent = NULL;
os_free(sm->ip_addr_text);
sm->ip_addr_text = NULL;
if (sm->multicast_sd >= 0)
close(sm->multicast_sd);
sm->multicast_sd = -1;
sm->started = 0;
}
/**
* upnp_wps_device_start - Start WPS UPnP operations on an interface
* @sm: WPS UPnP state machine from upnp_wps_device_init()
* @net_if: Selected network interface name
* Returns: 0 on success, -1 on failure
*/
static int upnp_wps_device_start(struct upnp_wps_device_sm *sm, char *net_if)
{
if (!sm || !net_if)
return -1;
if (sm->started)
upnp_wps_device_stop(sm);
sm->multicast_sd = -1;
sm->ssdp_sd = -1;
sm->started = 1;
sm->advertise_count = 0;
/* Fix up linux multicast handling */
if (add_ssdp_network(net_if))
goto fail;
/* Determine which IP and mac address we're using */
if (get_netif_info(net_if, &sm->ip_addr, &sm->ip_addr_text,
sm->mac_addr)) {
wpa_printf(MSG_INFO, "WPS UPnP: Could not get IP/MAC address "
"for %s. Does it have IP address?", net_if);
goto fail;
}
/* Listen for incoming TCP connections so that others
* can fetch our "xml files" from us.
*/
if (web_listener_start(sm))
goto fail;
/* Set up for receiving discovery (UDP) packets */
if (ssdp_listener_start(sm))
goto fail;
/* Set up for sending multicast */
if (ssdp_open_multicast(sm) < 0)
goto fail;
/*
* Broadcast NOTIFY messages to let the world know we exist.
* This is done via a state machine since the messages should not be
* all sent out at once.
*/
if (advertisement_state_machine_start(sm))
goto fail;
return 0;
fail:
upnp_wps_device_stop(sm);
return -1;
}
static struct upnp_wps_device_interface *
upnp_wps_get_iface(struct upnp_wps_device_sm *sm, void *priv)
{
struct upnp_wps_device_interface *iface;
dl_list_for_each(iface, &sm->interfaces,
struct upnp_wps_device_interface, list) {
if (iface->priv == priv)
return iface;
}
return NULL;
}
/**
* upnp_wps_device_deinit - Deinitialize WPS UPnP
* @sm: WPS UPnP state machine from upnp_wps_device_init()
* @priv: External context data that was used in upnp_wps_device_init() call
*/
void upnp_wps_device_deinit(struct upnp_wps_device_sm *sm, void *priv)
{
struct upnp_wps_device_interface *iface;
if (!sm)
return;
iface = upnp_wps_get_iface(sm, priv);
if (iface == NULL) {
wpa_printf(MSG_ERROR, "WPS UPnP: Could not find the interface "
"instance to deinit");
return;
}
wpa_printf(MSG_DEBUG, "WPS UPnP: Deinit interface instance %p", iface);
if (dl_list_len(&sm->interfaces) == 1) {
wpa_printf(MSG_DEBUG, "WPS UPnP: Deinitializing last instance "
"- free global device instance");
upnp_wps_device_stop(sm);
} else
upnp_wps_free_subscriptions(&sm->subscriptions,
iface->wps->registrar);
dl_list_del(&iface->list);
if (iface->peer.wps)
wps_deinit(iface->peer.wps);
os_free(iface->ctx->ap_pin);
os_free(iface->ctx);
os_free(iface);
if (dl_list_empty(&sm->interfaces)) {
os_free(sm->root_dir);
os_free(sm->desc_url);
os_free(sm);
shared_upnp_device = NULL;
}
}
/**
* upnp_wps_device_init - Initialize WPS UPnP
* @ctx: callback table; we must eventually free it
* @wps: Pointer to longterm WPS context
* @priv: External context data that will be used in callbacks
* @net_if: Selected network interface name
* Returns: WPS UPnP state or %NULL on failure
*/
struct upnp_wps_device_sm *
upnp_wps_device_init(struct upnp_wps_device_ctx *ctx, struct wps_context *wps,
void *priv, char *net_if)
{
struct upnp_wps_device_sm *sm;
struct upnp_wps_device_interface *iface;
int start = 0;
iface = os_zalloc(sizeof(*iface));
if (iface == NULL) {
os_free(ctx->ap_pin);
os_free(ctx);
return NULL;
}
wpa_printf(MSG_DEBUG, "WPS UPnP: Init interface instance %p", iface);
iface->ctx = ctx;
iface->wps = wps;
iface->priv = priv;
if (shared_upnp_device) {
wpa_printf(MSG_DEBUG, "WPS UPnP: Share existing device "
"context");
sm = shared_upnp_device;
} else {
wpa_printf(MSG_DEBUG, "WPS UPnP: Initialize device context");
sm = os_zalloc(sizeof(*sm));
if (!sm) {
wpa_printf(MSG_ERROR, "WPS UPnP: upnp_wps_device_init "
"failed");
os_free(iface);
os_free(ctx->ap_pin);
os_free(ctx);
return NULL;
}
shared_upnp_device = sm;
dl_list_init(&sm->msearch_replies);
dl_list_init(&sm->subscriptions);
dl_list_init(&sm->interfaces);
start = 1;
}
dl_list_add(&sm->interfaces, &iface->list);
if (start && upnp_wps_device_start(sm, net_if)) {
upnp_wps_device_deinit(sm, priv);
return NULL;
}
return sm;
}
/**
* upnp_wps_subscribers - Check whether there are any event subscribers
* @sm: WPS UPnP state machine from upnp_wps_device_init()
* Returns: 0 if no subscribers, 1 if subscribers
*/
int upnp_wps_subscribers(struct upnp_wps_device_sm *sm)
{
return !dl_list_empty(&sm->subscriptions);
}
int upnp_wps_set_ap_pin(struct upnp_wps_device_sm *sm, const char *ap_pin)
{
struct upnp_wps_device_interface *iface;
if (sm == NULL)
return 0;
dl_list_for_each(iface, &sm->interfaces,
struct upnp_wps_device_interface, list) {
os_free(iface->ctx->ap_pin);
if (ap_pin) {
iface->ctx->ap_pin = os_strdup(ap_pin);
if (iface->ctx->ap_pin == NULL)
return -1;
} else
iface->ctx->ap_pin = NULL;
}
return 0;
}