DGNum/hostapd
6
0
Fork 0
Code Issues Pull requests 1 Projects Releases Packages Wiki Activity Actions
hostapd/src/wps/wps_upnp_web.c
Jouni Malinen d0184cb25c UPnP: Renamed PutWLANResponse callback function to match action 
No point in adding extra "event_" to the name.
2009-02-06 21:44:19 +02:00

1964 lines
52 KiB
C
Raw Blame History

/*
* UPnP WPS Device - Web connections
* Copyright (c) 2000-2003 Intel Corporation
* Copyright (c) 2006-2007 Sony Corporation
* Copyright (c) 2008-2009 Atheros Communications
* Copyright (c) 2009, Jouni Malinen <j@w1.fi>
*
* See wps_upnp.c for more details on licensing and code history.
*/
#include "includes.h"
#include <fcntl.h>
#include "common.h"
#include "base64.h"
#include "eloop.h"
#include "uuid.h"
#include "httpread.h"
#include "wps_i.h"
#include "wps_upnp.h"
#include "wps_upnp_i.h"
/***************************************************************************
* Web connections (we serve pages of info about ourselves, handle
* requests, etc. etc.).
**************************************************************************/
#define WEB_CONNECTION_TIMEOUT_SEC 30 /* Drop web connection after t.o. */
#define WEB_CONNECTION_MAX_READ 8000 /* Max we'll read for TCP request */
#define MAX_WEB_CONNECTIONS 10 /* max simultaneous web connects */
static const char *urn_wfawlanconfig =
"urn:schemas-wifialliance-org:service:WFAWLANConfig:1";
static const char *http_server_hdr =
"Server: unspecified, UPnP/1.0, unspecified\r\n";
static const char *http_connection_close =
"Connection: close\r\n";
/*
* Incoming web connections are recorded in this struct.
* A web connection is a TCP connection to us, the server;
* it is called a "web connection" because we use http and serve
* data that looks like web pages.
* State information is need to track the connection until we figure
* out what they want and what we want to do about it.
*/
struct web_connection {
/* double linked list */
struct web_connection *next;
struct web_connection *prev;
struct upnp_wps_device_sm *sm; /* parent */
int sd; /* socket to read from */
struct sockaddr_in cli_addr;
int sd_registered; /* nonzero if we must cancel registration */
struct httpread *hread; /* state machine for reading socket */
int n_rcvd_data; /* how much data read so far */
int done; /* internal flag, set when we've finished */
};
/*
* XML parsing and formatting
*
* XML is a markup language based on unicode; usually (and in our case,
* always!) based on utf-8. utf-8 uses a variable number of bytes per
* character. utf-8 has the advantage that all non-ASCII unicode characters are
* represented by sequences of non-ascii (high bit set) bytes, whereas ASCII
* characters are single ascii bytes, thus we can use typical text processing.
*
* (One other interesting thing about utf-8 is that it is possible to look at
* any random byte and determine if it is the first byte of a character as
* versus a continuation byte).
*
* The base syntax of XML uses a few ASCII punctionation characters; any
* characters that would appear in the payload data are rewritten using
* sequences, e.g., &amp; for ampersand(&) and &lt for left angle bracket (<).
* Five such escapes total (more can be defined but that does not apply to our
* case). Thus we can safely parse for angle brackets etc.
*
* XML describes tree structures of tagged data, with each element beginning
* with an opening tag <label> and ending with a closing tag </label> with
* matching label. (There is also a self-closing tag <label/> which is supposed
* to be equivalent to <label></label>, i.e., no payload, but we are unlikely
* to see it for our purpose).
*
* Actually the opening tags are a little more complicated because they can
* contain "attributes" after the label (delimited by ascii space or tab chars)
* of the form attribute_label="value" or attribute_label='value'; as it turns
* out we do not have to read any of these attributes, just ignore them.
*
* Labels are any sequence of chars other than space, tab, right angle bracket
* (and ?), but may have an inner structure of <namespace><colon><plain_label>.
* As it turns out, we can ignore the namespaces, in fact we can ignore the
* entire tree hierarchy, because the plain labels we are looking for will be
* unique (not in general, but for this application). We do however have to be
* careful to skip over the namespaces.
*
* In generating XML we have to be more careful, but that is easy because
* everything we do is pretty canned. The only real care to take is to escape
* any special chars in our payload.
*/
/**
* xml_next_tag - Advance to next tag
* @in: Input
* @out: OUT: start of tag just after '<'
* @out_tagname: OUT: start of name of tag, skipping namespace
* @end: OUT: one after tag
* Returns: 0 on success, 1 on failure
*
* A tag has form:
* <left angle bracket><...><right angle bracket>
* Within the angle brackets, there is an optional leading forward slash (which
* makes the tag an ending tag), then an optional leading label (followed by
* colon) and then the tag name itself.
*
* Note that angle brackets present in the original data must have been encoded
* as &lt; and &gt; so they will not trouble us.
*/
static int xml_next_tag(char *in, char **out, char **out_tagname,
char **end)
{
while (*in && *in != '<')
in++;
if (*in != '<')
return 1;
*out = ++in;
if (*in == '/')
in++;
*out_tagname = in; /* maybe */
while (isalnum(*in) || *in == '-')
in++;
if (*in == ':')
*out_tagname = ++in;
while (*in && *in != '>')
in++;
if (*in != '>')
return 1;
*end = ++in;
return 0;
}
/* xml_data_encode -- format data for xml file, escaping special characters.
*
* Note that we assume we are using utf8 both as input and as output!
* In utf8, characters may be classed as follows:
* 0xxxxxxx(2) -- 1 byte ascii char
* 11xxxxxx(2) -- 1st byte of multi-byte char w/ unicode value >= 0x80
* 110xxxxx(2) -- 1st byte of 2 byte sequence (5 payload bits here)
* 1110xxxx(2) -- 1st byte of 3 byte sequence (4 payload bits here)
* 11110xxx(2) -- 1st byte of 4 byte sequence (3 payload bits here)
* 10xxxxxx(2) -- extension byte (6 payload bits per byte)
* Some values implied by the above are however illegal because they
* do not represent unicode chars or are not the shortest encoding.
* Actually, we can almost entirely ignore the above and just do
* text processing same as for ascii text.
*
* XML is written with arbitrary unicode characters, except that five
* characters have special meaning and so must be escaped where they
* appear in payload data... which we do here.
*/
static void xml_data_encode(struct wpabuf *buf, const char *data, int len)
{
int i;
for (i = 0; i < len; i++) {
u8 c = ((u8 *) data)[i];
if (c == '<') {
wpabuf_put_str(buf, "&lt;");
continue;
}
if (c == '>') {
wpabuf_put_str(buf, "&gt;");
continue;
}
if (c == '&') {
wpabuf_put_str(buf, "&amp;");
continue;
}
if (c == '\'') {
wpabuf_put_str(buf, "&apos;");
continue;
}
if (c == '"') {
wpabuf_put_str(buf, "&quot;");
continue;
}
/*
* We could try to represent control characters using the
* sequence: &#x; where x is replaced by a hex numeral, but not
* clear why we would do this.
*/
wpabuf_put_u8(buf, c);
}
}
/* xml_add_tagged_data -- format tagged data as a new xml line.
*
* tag must not have any special chars.
* data may have special chars, which are escaped.
*/
static void xml_add_tagged_data(struct wpabuf *buf, const char *tag,
const char *data)
{
wpabuf_printf(buf, "<%s>", tag);
xml_data_encode(buf, data, os_strlen(data));
wpabuf_printf(buf, "</%s>\n", tag);
}
/* A POST body looks something like (per upnp spec):
* <?xml version="1.0"?>
* <s:Envelope
* xmlns:s="http://schemas.xmlsoap.org/soap/envelope/"
* s:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
* <s:Body>
* <u:actionName xmlns:u="urn:schemas-upnp-org:service:serviceType:v">
* <argumentName>in arg value</argumentName>
* other in args and their values go here, if any
* </u:actionName>
* </s:Body>
* </s:Envelope>
*
* where :
* s: might be some other namespace name followed by colon
* u: might be some other namespace name followed by colon
* actionName will be replaced according to action requested
* schema following actionName will be WFA scheme instead
* argumentName will be actual argument name
* (in arg value) will be actual argument value
*/
static int
upnp_get_first_document_item(char *doc, const char *item, char **value)
{
const char *match = item;
int match_len = os_strlen(item);
char *tag;
char *tagname;
char *end;
*value = NULL; /* default, bad */
/*
* This is crude: ignore any possible tag name conflicts and go right
* to the first tag of this name. This should be ok for the limited
* domain of UPnP messages.
*/
for (;;) {
if (xml_next_tag(doc, &tag, &tagname, &end))
return 1;
doc = end;
if (!os_strncasecmp(tagname, match, match_len) &&
*tag != '/' &&
(tagname[match_len] == '>' ||
!isgraph(tagname[match_len]))) {
break;
}
}
end = doc;
while (*end && *end != '<')
end++;
*value = os_zalloc(1 + (end - doc));
if (*value == NULL)
return 1;
os_memcpy(*value, doc, end - doc);
return 0;
}
/*
* "Files" that we serve via HTTP. The format of these files is given by
* WFA WPS specifications. Extra white space has been removed to save space.
*/
static const char wps_scpd_xml[] =
"<?xml version=\"1.0\"?>\n"
"<scpd xmlns=\"urn:schemas-upnp-org:service-1-0\">\n"
"<specVersion><major>1</major><minor>0</minor></specVersion>\n"
"<actionList>\n"
"<action>\n"
"<name>GetDeviceInfo</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewDeviceInfo</name>\n"
"<direction>out</direction>\n"
"<relatedStateVariable>DeviceInfo</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>PutMessage</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewInMessage</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>InMessage</relatedStateVariable>\n"
"</argument>\n"
"<argument>\n"
"<name>NewOutMessage</name>\n"
"<direction>out</direction>\n"
"<relatedStateVariable>OutMessage</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>GetAPSettings</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewMessage</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>Message</relatedStateVariable>\n"
"</argument>\n"
"<argument>\n"
"<name>NewAPSettings</name>\n"
"<direction>out</direction>\n"
"<relatedStateVariable>APSettings</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>SetAPSettings</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>APSettings</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>APSettings</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>DelAPSettings</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewAPSettings</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>APSettings</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>GetSTASettings</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewMessage</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>Message</relatedStateVariable>\n"
"</argument>\n"
"<argument>\n"
"<name>NewSTASettings</name>\n"
"<direction>out</direction>\n"
"<relatedStateVariable>STASettings</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>SetSTASettings</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewSTASettings</name>\n"
"<direction>out</direction>\n"
"<relatedStateVariable>STASettings</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>DelSTASettings</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewSTASettings</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>STASettings</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>PutWLANResponse</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewMessage</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>Message</relatedStateVariable>\n"
"</argument>\n"
"<argument>\n"
"<name>NewWLANEventType</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>WLANEventType</relatedStateVariable>\n"
"</argument>\n"
"<argument>\n"
"<name>NewWLANEventMAC</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>WLANEventMAC</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>SetSelectedRegistrar</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewMessage</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>Message</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>RebootAP</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewAPSettings</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>APSettings</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>ResetAP</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewMessage</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>Message</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>RebootSTA</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewSTASettings</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>APSettings</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"<action>\n"
"<name>ResetSTA</name>\n"
"<argumentList>\n"
"<argument>\n"
"<name>NewMessage</name>\n"
"<direction>in</direction>\n"
"<relatedStateVariable>Message</relatedStateVariable>\n"
"</argument>\n"
"</argumentList>\n"
"</action>\n"
"</actionList>\n"
"<serviceStateTable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>Message</name>\n"
"<dataType>bin.base64</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>InMessage</name>\n"
"<dataType>bin.base64</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>OutMessage</name>\n"
"<dataType>bin.base64</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>DeviceInfo</name>\n"
"<dataType>bin.base64</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>APSettings</name>\n"
"<dataType>bin.base64</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"yes\">\n"
"<name>APStatus</name>\n"
"<dataType>ui1</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>STASettings</name>\n"
"<dataType>bin.base64</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"yes\">\n"
"<name>STAStatus</name>\n"
"<dataType>ui1</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"yes\">\n"
"<name>WLANEvent</name>\n"
"<dataType>bin.base64</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>WLANEventType</name>\n"
"<dataType>ui1</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>WLANEventMAC</name>\n"
"<dataType>string</dataType>\n"
"</stateVariable>\n"
"<stateVariable sendEvents=\"no\">\n"
"<name>WLANResponse</name>\n"
"<dataType>bin.base64</dataType>\n"
"</stateVariable>\n"
"</serviceStateTable>\n"
"</scpd>\n"
;
static const char *wps_device_xml_prefix =
"<?xml version=\"1.0\"?>\n"
"<root xmlns=\"urn:schemas-upnp-org:device-1-0\">\n"
"<specVersion>\n"
"<major>1</major>\n"
"<minor>0</minor>\n"
"</specVersion>\n"
"<device>\n"
"<deviceType>urn:schemas-wifialliance-org:device:WFADevice:1"
"</deviceType>\n";
static const char *wps_device_xml_postfix =
"<serviceList>\n"
"<service>\n"
"<serviceType>urn:schemas-wifialliance-org:service:WFAWLANConfig:1"
"</serviceType>\n"
"<serviceId>urn:wifialliance-org:serviceId:WFAWLANConfig1</serviceId>"
"\n"
"<SCPDURL>" UPNP_WPS_SCPD_XML_FILE "</SCPDURL>\n"
"<controlURL>" UPNP_WPS_DEVICE_CONTROL_FILE "</controlURL>\n"
"<eventSubURL>" UPNP_WPS_DEVICE_EVENT_FILE "</eventSubURL>\n"
"</service>\n"
"</serviceList>\n"
"</device>\n"
"</root>\n";
/* format_wps_device_xml -- produce content of "file" wps_device.xml
* (UPNP_WPS_DEVICE_XML_FILE)
*/
static void format_wps_device_xml(struct upnp_wps_device_sm *sm,
struct wpabuf *buf)
{
const char *s;
char uuid_string[80];
wpabuf_put_str(buf, wps_device_xml_prefix);
/*
* Add required fields with default values if not configured. Add
* optional and recommended fields only if configured.
*/
s = sm->wps->friendly_name;
s = ((s && *s) ? s : "WPS Access Point");
xml_add_tagged_data(buf, "friendlyName", s);
s = sm->wps->dev.manufacturer;
s = ((s && *s) ? s : "");
xml_add_tagged_data(buf, "manufacturer", s);
if (sm->wps->manufacturer_url)
xml_add_tagged_data(buf, "manufacturerURL",
sm->wps->manufacturer_url);
if (sm->wps->model_description)
xml_add_tagged_data(buf, "modelDescription",
sm->wps->model_description);
s = sm->wps->dev.model_name;
s = ((s && *s) ? s : "");
xml_add_tagged_data(buf, "modelName", s);
if (sm->wps->dev.model_number)
xml_add_tagged_data(buf, "modelNumber",
sm->wps->dev.model_number);
if (sm->wps->model_url)
xml_add_tagged_data(buf, "modelURL", sm->wps->model_url);
if (sm->wps->dev.serial_number)
xml_add_tagged_data(buf, "serialNumber",
sm->wps->dev.serial_number);
uuid_bin2str(sm->wps->uuid, uuid_string, sizeof(uuid_string));
s = uuid_string;
/* Need "uuid:" prefix, thus we can't use xml_add_tagged_data()
* easily...
*/
wpabuf_put_str(buf, "<UDN>uuid:");
xml_data_encode(buf, s, os_strlen(s));
wpabuf_put_str(buf, "</UDN>\n");
if (sm->wps->upc)
xml_add_tagged_data(buf, "UPC", sm->wps->upc);
wpabuf_put_str(buf, wps_device_xml_postfix);
}
void web_connection_stop(struct web_connection *c)
{
struct upnp_wps_device_sm *sm = c->sm;
httpread_destroy(c->hread);
c->hread = NULL;
close(c->sd);
c->sd = -1;
if (c->next == c) {
sm->web_connections = NULL;
} else {
if (sm->web_connections == c)
sm->web_connections = c->next;
c->next->prev = c->prev;
c->prev->next = c->next;
}
os_free(c);
sm->n_web_connections--;
}
static void http_put_reply_code(struct wpabuf *buf, enum http_reply_code code)
{
wpabuf_put_str(buf, "HTTP/1.1 ");
switch (code) {
case HTTP_OK:
wpabuf_put_str(buf, "200 OK\r\n");
break;
case HTTP_BAD_REQUEST:
wpabuf_put_str(buf, "400 Bad request\r\n");
break;
case HTTP_PRECONDITION_FAILED:
wpabuf_put_str(buf, "412 Precondition failed\r\n");
break;
case HTTP_UNIMPLEMENTED:
wpabuf_put_str(buf, "501 Unimplemented\r\n");
break;
case HTTP_INTERNAL_SERVER_ERROR:
default:
wpabuf_put_str(buf, "500 Internal server error\r\n");
break;
}
}
static void http_put_date(struct wpabuf *buf)
{
wpabuf_put_str(buf, "Date: ");
format_date(buf);
wpabuf_put_str(buf, "\r\n");
}
static void http_put_empty(struct wpabuf *buf, enum http_reply_code code)
{
http_put_reply_code(buf, code);
wpabuf_put_str(buf, http_server_hdr);
wpabuf_put_str(buf, http_connection_close);
wpabuf_put_str(buf, "Content-Length: 0\r\n"
"\r\n");
}
/* Given that we have received a header w/ GET, act upon it
*
* Format of GET (case-insensitive):
*
* First line must be:
* GET /<file> HTTP/1.1
* Since we don't do anything fancy we just ignore other lines.
*
* Our response (if no error) which includes only required lines is:
* HTTP/1.1 200 OK
* Connection: close
* Content-Type: text/xml
* Date: <rfc1123-date>
*
* Header lines must end with \r\n
* Per RFC 2616, content-length: is not required but connection:close
* would appear to be required (given that we will be closing it!).
*/
static void web_connection_parse_get(struct web_connection *c, char *filename)
{
struct upnp_wps_device_sm *sm = c->sm;
struct wpabuf *buf; /* output buffer, allocated */
char *put_length_here;
char *body_start;
enum {
GET_DEVICE_XML_FILE,
GET_SCPD_XML_FILE
} req;
size_t extra_len = 0;
int body_length;
char len_buf[10];
/*
* It is not required that filenames be case insensitive but it is
* allowed and cannot hurt here.
*/
if (filename == NULL)
filename = "(null)"; /* just in case */
if (os_strcasecmp(filename, UPNP_WPS_DEVICE_XML_FILE) == 0) {
wpa_printf(MSG_DEBUG, "WPS UPnP: HTTP GET for device XML");
req = GET_DEVICE_XML_FILE;
extra_len = 3000;
if (sm->wps->friendly_name)
extra_len += os_strlen(sm->wps->friendly_name);
if (sm->wps->manufacturer_url)
extra_len += os_strlen(sm->wps->manufacturer_url);
if (sm->wps->model_description)
extra_len += os_strlen(sm->wps->model_description);
if (sm->wps->model_url)
extra_len += os_strlen(sm->wps->model_url);
if (sm->wps->upc)
extra_len += os_strlen(sm->wps->upc);
} else if (!os_strcasecmp(filename, UPNP_WPS_SCPD_XML_FILE)) {
wpa_printf(MSG_DEBUG, "WPS UPnP: HTTP GET for SCPD XML");
req = GET_SCPD_XML_FILE;
extra_len = os_strlen(wps_scpd_xml);
} else {
/* File not found */
wpa_printf(MSG_DEBUG, "WPS UPnP: HTTP GET file not found: %s",
filename);
buf = wpabuf_alloc(200);
if (buf == NULL)
return;
wpabuf_put_str(buf,
"HTTP/1.1 404 Not Found\r\n"
"Connection: close\r\n");
http_put_date(buf);
/* terminating empty line */
wpabuf_put_str(buf, "\r\n");
goto send_buf;
}
buf = wpabuf_alloc(1000 + extra_len);
if (buf == NULL)
return;
wpabuf_put_str(buf,
"HTTP/1.1 200 OK\r\n"
"Content-Type: text/xml; charset=\"utf-8\"\r\n");
wpabuf_put_str(buf, "Server: Unspecified, UPnP/1.0, Unspecified\r\n");
wpabuf_put_str(buf, "Connection: close\r\n");
wpabuf_put_str(buf, "Content-Length: ");
/*
* We will paste the length in later, leaving some extra whitespace.
* HTTP code is supposed to be tolerant of extra whitespace.
*/
put_length_here = wpabuf_put(buf, 0);
wpabuf_put_str(buf, " \r\n");
http_put_date(buf);
/* terminating empty line */
wpabuf_put_str(buf, "\r\n");
body_start = wpabuf_put(buf, 0);
switch (req) {
case GET_DEVICE_XML_FILE:
format_wps_device_xml(sm, buf);
break;
case GET_SCPD_XML_FILE:
wpabuf_put_str(buf, wps_scpd_xml);
break;
}
/* Now patch in the content length at the end */
body_length = (char *) wpabuf_put(buf, 0) - body_start;
os_snprintf(len_buf, 10, "%d", body_length);
os_memcpy(put_length_here, len_buf, os_strlen(len_buf));
send_buf:
send_wpabuf(c->sd, buf);
wpabuf_free(buf);
}
static struct wpabuf * web_get_item(char *data, const char *name,
enum http_reply_code *ret)
{
char *msg;
struct wpabuf *buf;
unsigned char *decoded;
size_t len;
if (upnp_get_first_document_item(data, name, &msg)) {
*ret = UPNP_ARG_VALUE_INVALID;
return NULL;
}
decoded = base64_decode((unsigned char *) msg, os_strlen(msg), &len);
os_free(msg);
if (decoded == NULL) {
*ret = UPNP_OUT_OF_MEMORY;
return NULL;
}
buf = wpabuf_alloc_ext_data(decoded, len);
if (buf == NULL) {
os_free(decoded);
*ret = UPNP_OUT_OF_MEMORY;
return NULL;
}
return buf;
}
static enum http_reply_code
web_process_get_device_info(struct upnp_wps_device_sm *sm,
struct wpabuf **reply, const char **replyname)
{
static const char *name = "NewDeviceInfo";
wpa_printf(MSG_DEBUG, "WPS UPnP: GetDeviceInfo");
if (sm->ctx->rx_req_get_device_info == NULL)
return HTTP_INTERNAL_SERVER_ERROR;
*reply = sm->ctx->rx_req_get_device_info(sm->priv, &sm->peer);
if (*reply == NULL) {
wpa_printf(MSG_INFO, "WPS UPnP: Failed to get DeviceInfo");
return HTTP_INTERNAL_SERVER_ERROR;
}
*replyname = name;
return HTTP_OK;
}
static enum http_reply_code
web_process_put_message(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply, const char **replyname)
{
struct wpabuf *msg;
static const char *name = "NewOutMessage";
enum http_reply_code ret;
/*
* PutMessage is used by external UPnP-based Registrar to perform WPS
* operation with the access point itself; as compared with
* PutWLANResponse which is for proxying.
*/
wpa_printf(MSG_DEBUG, "WPS UPnP: PutMessage");
if (sm->ctx->rx_req_put_message == NULL)
return HTTP_INTERNAL_SERVER_ERROR;
msg = web_get_item(data, "NewInMessage", &ret);
if (msg == NULL)
return ret;
*reply = sm->ctx->rx_req_put_message(sm->priv, &sm->peer, msg);
wpabuf_free(msg);
if (*reply == NULL)
return HTTP_INTERNAL_SERVER_ERROR;
*replyname = name;
return HTTP_OK;
}
static enum http_reply_code
web_process_get_ap_settings(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply, const char **replyname)
{
struct wpabuf *msg;
static const char *name = "NewAPSettings";
enum http_reply_code ret;
wpa_printf(MSG_DEBUG, "WPS UPnP: GetAPSettings");
if (sm->ctx->rx_req_get_ap_settings == NULL)
return HTTP_INTERNAL_SERVER_ERROR;
msg = web_get_item(data, "NewMessage", &ret);
if (msg == NULL)
return ret;
*reply = sm->ctx->rx_req_get_ap_settings(sm->priv, msg);
wpabuf_free(msg);
if (*reply == NULL)
return HTTP_INTERNAL_SERVER_ERROR;
*replyname = name;
return HTTP_OK;
}
static enum http_reply_code
web_process_set_ap_settings(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply, const char **replyname)
{
struct wpabuf *msg;
enum http_reply_code ret;
wpa_printf(MSG_DEBUG, "WPS UPnP: SetAPSettings");
msg = web_get_item(data, "NewAPSettings", &ret);
if (msg == NULL)
return ret;
if (!sm->ctx->rx_req_set_ap_settings ||
sm->ctx->rx_req_set_ap_settings(sm->priv, msg)) {
wpabuf_free(msg);
return HTTP_INTERNAL_SERVER_ERROR;
}
wpabuf_free(msg);
*replyname = NULL;
*reply = NULL;
return HTTP_OK;
}
static enum http_reply_code
web_process_del_ap_settings(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply, const char **replyname)
{
struct wpabuf *msg;
enum http_reply_code ret;
wpa_printf(MSG_DEBUG, "WPS UPnP: DelAPSettings");
msg = web_get_item(data, "NewAPSettings", &ret);
if (msg == NULL)
return ret;
if (!sm->ctx->rx_req_del_ap_settings ||
sm->ctx->rx_req_del_ap_settings(sm->priv, msg)) {
wpabuf_free(msg);
return HTTP_INTERNAL_SERVER_ERROR;
}
wpabuf_free(msg);
*replyname = NULL;
*reply = NULL;
return HTTP_OK;
}
static enum http_reply_code
web_process_get_sta_settings(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply, const char **replyname)
{
struct wpabuf *msg;
static const char *name = "NewSTASettings";
enum http_reply_code ret;
wpa_printf(MSG_DEBUG, "WPS UPnP: GetSTASettings");
if (sm->ctx->rx_req_get_sta_settings == NULL)
return HTTP_INTERNAL_SERVER_ERROR;
msg = web_get_item(data, "NewMessage", &ret);
if (msg == NULL)
return ret;
*reply = sm->ctx->rx_req_get_sta_settings(sm->priv, msg);
wpabuf_free(msg);
if (*reply == NULL)
return HTTP_INTERNAL_SERVER_ERROR;
*replyname = name;
return HTTP_OK;
}
static enum http_reply_code
web_process_set_sta_settings(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply, const char **replyname)
{
struct wpabuf *msg;
enum http_reply_code ret;
wpa_printf(MSG_DEBUG, "WPS UPnP: SetSTASettings");
msg = web_get_item(data, "NewSTASettings", &ret);
if (msg == NULL)
return ret;
if (!sm->ctx->rx_req_set_sta_settings ||
sm->ctx->rx_req_set_sta_settings(sm->priv, msg)) {
wpabuf_free(msg);
return HTTP_INTERNAL_SERVER_ERROR;
}
wpabuf_free(msg);
*replyname = NULL;
*reply = NULL;
return HTTP_OK;
}
static enum http_reply_code
web_process_del_sta_settings(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply, const char **replyname)
{
struct wpabuf *msg;
enum http_reply_code ret;
wpa_printf(MSG_DEBUG, "WPS UPnP: DelSTASettings");
msg = web_get_item(data, "NewSTASettings", &ret);
if (msg == NULL)
return ret;
if (!sm->ctx->rx_req_del_sta_settings ||
sm->ctx->rx_req_del_sta_settings(sm->priv, msg)) {
wpabuf_free(msg);
return HTTP_INTERNAL_SERVER_ERROR;
}
wpabuf_free(msg);
*replyname = NULL;
*reply = NULL;
return HTTP_OK;
}
static enum http_reply_code
web_process_put_wlan_response(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply, const char **replyname)
{
struct wpabuf *msg;
enum http_reply_code ret;
u8 macaddr[ETH_ALEN];
int ev_type;
int type;
char *val;
/*
* External UPnP-based Registrar is passing us a message to be proxied
* over to a Wi-Fi -based client of ours.
*/
wpa_printf(MSG_DEBUG, "WPS UPnP: PutWLANResponse");
msg = web_get_item(data, "NewMessage", &ret);
if (msg == NULL)
return ret;
if (upnp_get_first_document_item(data, "NewWLANEventType", &val)) {
wpabuf_free(msg);
return UPNP_ARG_VALUE_INVALID;
}
ev_type = atol(val);
os_free(val);
val = NULL;
if (upnp_get_first_document_item(data, "NewWLANEventMAC", &val) ||
hwaddr_aton(val, macaddr)) {
wpabuf_free(msg);
os_free(val);
return UPNP_ARG_VALUE_INVALID;
}
os_free(val);
if (ev_type == UPNP_WPS_WLANEVENT_TYPE_EAP) {
struct wps_parse_attr attr;
if (wps_parse_msg(msg, &attr) < 0 ||
attr.msg_type == NULL)
type = -1;
else
type = *attr.msg_type;
wpa_printf(MSG_DEBUG, "WPS UPnP: Message Type %d", type);
} else
type = -1;
if (!sm->ctx->rx_req_put_wlan_response ||
sm->ctx->rx_req_put_wlan_response(sm->priv, ev_type, macaddr, msg,
type)) {
wpa_printf(MSG_INFO, "WPS UPnP: Fail: sm->ctx->"
"rx_req_put_wlan_response");
wpabuf_free(msg);
return HTTP_INTERNAL_SERVER_ERROR;
}
wpabuf_free(msg);
*replyname = NULL;
*reply = NULL;
return HTTP_OK;
}
static enum http_reply_code
web_process_set_selected_registrar(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply,
const char **replyname)
{
struct wpabuf *msg;
enum http_reply_code ret;
wpa_printf(MSG_DEBUG, "WPS UPnP: SetSelectedRegistrar");
msg = web_get_item(data, "NewMessage", &ret);
if (msg == NULL)
return ret;
if (!sm->ctx->rx_req_set_selected_registrar ||
sm->ctx->rx_req_set_selected_registrar(sm->priv, msg)) {
wpabuf_free(msg);
return HTTP_INTERNAL_SERVER_ERROR;
}
wpabuf_free(msg);
*replyname = NULL;
*reply = NULL;
return HTTP_OK;
}
static enum http_reply_code
web_process_reboot_ap(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply, const char **replyname)
{
struct wpabuf *msg;
enum http_reply_code ret;
wpa_printf(MSG_DEBUG, "WPS UPnP: RebootAP");
msg = web_get_item(data, "NewAPSettings", &ret);
if (msg == NULL)
return ret;
if (!sm->ctx->rx_req_reboot_ap ||
sm->ctx->rx_req_reboot_ap(sm->priv, msg)) {
wpabuf_free(msg);
return HTTP_INTERNAL_SERVER_ERROR;
}
wpabuf_free(msg);
*replyname = NULL;
*reply = NULL;
return HTTP_OK;
}
static enum http_reply_code
web_process_reset_ap(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply, const char **replyname)
{
struct wpabuf *msg;
enum http_reply_code ret;
wpa_printf(MSG_DEBUG, "WPS UPnP: ResetAP");
msg = web_get_item(data, "NewMessage", &ret);
if (msg == NULL)
return ret;
if (!sm->ctx->rx_req_reset_ap ||
sm->ctx->rx_req_reset_ap(sm->priv, msg)) {
wpabuf_free(msg);
return HTTP_INTERNAL_SERVER_ERROR;
}
wpabuf_free(msg);
*replyname = NULL;
*reply = NULL;
return HTTP_OK;
}
static enum http_reply_code
web_process_reboot_sta(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply, const char **replyname)
{
struct wpabuf *msg;
enum http_reply_code ret;
wpa_printf(MSG_DEBUG, "WPS UPnP: RebootSTA");
msg = web_get_item(data, "NewSTASettings", &ret);
if (msg == NULL)
return ret;
if (!sm->ctx->rx_req_reboot_sta ||
sm->ctx->rx_req_reboot_sta(sm->priv, msg)) {
wpabuf_free(msg);
return HTTP_INTERNAL_SERVER_ERROR;
}
wpabuf_free(msg);
*replyname = NULL;
*reply = NULL;
return HTTP_OK;
}
static enum http_reply_code
web_process_reset_sta(struct upnp_wps_device_sm *sm, char *data,
struct wpabuf **reply, const char **replyname)
{
struct wpabuf *msg;
enum http_reply_code ret;
wpa_printf(MSG_DEBUG, "WPS UPnP: ResetSTA");
msg = web_get_item(data, "NewMessage", &ret);
if (msg == NULL)
return ret;
if (!sm->ctx->rx_req_reset_sta ||
sm->ctx->rx_req_reset_sta(sm->priv, msg)) {
wpabuf_free(msg);
return HTTP_INTERNAL_SERVER_ERROR;
}
wpabuf_free(msg);
*replyname = NULL;
*reply = NULL;
return HTTP_OK;
}
static const char *soap_prefix =
"<?xml version=\"1.0\"?>\n"
"<s:Envelope xmlns:s=\"http://schemas.xmlsoap.org/soap/envelope/\" "
"s:encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">\n"
"<s:Body>\n";
static const char *soap_postfix =
"</s:Body>\n</s:Envelope>\n";
static const char *soap_error_prefix =
"<s:Fault>\n"
"<faultcode>s:Client</faultcode>\n"
"<faultstring>UPnPError</faultstring>\n"
"<detail>\n"
"<UPnPError xmlns=\"urn:schemas-upnp-org:control-1-0\">\n";
static const char *soap_error_postfix =
"<errorDescription>Error</errorDescription>\n"
"</UPnPError>\n"
"</detail>\n"
"</s:Fault>\n";
static void web_connection_send_reply(struct web_connection *c,
enum http_reply_code ret,
const char *action, int action_len,
const struct wpabuf *reply,
const char *replyname)
{
struct wpabuf *buf;
char *replydata;
char *put_length_here = NULL;
char *body_start = NULL;
if (reply) {
size_t len;
replydata = (char *) base64_encode(wpabuf_head(reply),
wpabuf_len(reply), &len);
} else
replydata = NULL;
/* Parameters of the response:
* action(action_len) -- action we are responding to
* replyname -- a name we need for the reply
* replydata -- NULL or null-terminated string
*/
buf = wpabuf_alloc(1000 + (replydata ? os_strlen(replydata) : 0U) +
(action_len > 0 ? action_len * 2 : 0));
if (buf == NULL) {
wpa_printf(MSG_INFO, "WPS UPnP: Cannot allocate reply to "
"POST");
wpabuf_free(buf);
os_free(replydata);
return;
}
/*
* Assuming we will be successful, put in the output header first.
* Note: we do not keep connections alive (and httpread does
* not support it)... therefore we must have Connection: close.
*/
if (ret == HTTP_OK) {
wpabuf_put_str(buf,
"HTTP/1.1 200 OK\r\n"
"Content-Type: text/xml; "
"charset=\"utf-8\"\r\n");
} else {
wpabuf_printf(buf, "HTTP/1.1 %d Error\r\n", ret);
}
wpabuf_put_str(buf, http_connection_close);
wpabuf_put_str(buf, "Content-Length: ");
/*
* We will paste the length in later, leaving some extra whitespace.
* HTTP code is supposed to be tolerant of extra whitespace.
*/
put_length_here = wpabuf_put(buf, 0);
wpabuf_put_str(buf, " \r\n");
http_put_date(buf);
/* terminating empty line */
wpabuf_put_str(buf, "\r\n");
body_start = wpabuf_put(buf, 0);
if (ret == HTTP_OK) {
wpabuf_put_str(buf, soap_prefix);
wpabuf_put_str(buf, "<u:");
wpabuf_put_data(buf, action, action_len);
wpabuf_put_str(buf, "Response xmlns:u=\"");
wpabuf_put_str(buf, urn_wfawlanconfig);
wpabuf_put_str(buf, "\">\n");
if (replydata && replyname) {
/* TODO: might possibly need to escape part of reply
* data? ...
* probably not, unlikely to have ampersand(&) or left
* angle bracket (<) in it...
*/
wpabuf_printf(buf, "<%s>", replyname);
wpabuf_put_str(buf, replydata);
wpabuf_printf(buf, "</%s>\n", replyname);
}
wpabuf_put_str(buf, "</u:");
wpabuf_put_data(buf, action, action_len);
wpabuf_put_str(buf, "Response>\n");
wpabuf_put_str(buf, soap_postfix);
} else {
/* Error case */
wpabuf_put_str(buf, soap_prefix);
wpabuf_put_str(buf, soap_error_prefix);
wpabuf_printf(buf, "<errorCode>%d</errorCode>\n", ret);
wpabuf_put_str(buf, soap_error_postfix);
wpabuf_put_str(buf, soap_postfix);
}
os_free(replydata);
/* Now patch in the content length at the end */
if (body_start && put_length_here) {
int body_length = (char *) wpabuf_put(buf, 0) - body_start;
char len_buf[10];
os_snprintf(len_buf, sizeof(len_buf), "%d", body_length);
os_memcpy(put_length_here, len_buf, os_strlen(len_buf));
}
send_wpabuf(c->sd, buf);
wpabuf_free(buf);
}
static const char * web_get_action(struct web_connection *c,
const char *filename, size_t *action_len)
{
const char *match;
int match_len;
char *b;
char *action;
*action_len = 0;
if (os_strcasecmp(filename, UPNP_WPS_DEVICE_CONTROL_FILE)) {
wpa_printf(MSG_INFO, "WPS UPnP: Invalid POST filename %s",
filename);
return NULL;
}
/* The SOAPAction line of the header tells us what we want to do */
b = httpread_hdr_line_get(c->hread, "SOAPAction:");
if (b == NULL)
return NULL;
if (*b == '"')
b++;
else
return NULL;
match = urn_wfawlanconfig;
match_len = os_strlen(urn_wfawlanconfig) - 1;
if (os_strncasecmp(b, match, match_len))
return NULL;
b += match_len;
/* skip over version */
while (isgraph(*b) && *b != '#')
b++;
if (*b != '#')
return NULL;
b++;
/* Following the sharp(#) should be the action and a double quote */
action = b;
while (isgraph(*b) && *b != '"')
b++;
if (*b != '"')
return NULL;
*action_len = b - action;
return action;
}
/* Given that we have received a header w/ POST, act upon it
*
* Format of POST (case-insensitive):
*
* First line must be:
* POST /<file> HTTP/1.1
* Since we don't do anything fancy we just ignore other lines.
*
* Our response (if no error) which includes only required lines is:
* HTTP/1.1 200 OK
* Connection: close
* Content-Type: text/xml
* Date: <rfc1123-date>
*
* Header lines must end with \r\n
* Per RFC 2616, content-length: is not required but connection:close
* would appear to be required (given that we will be closing it!).
*/
static void web_connection_parse_post(struct web_connection *c,
const char *filename)
{
enum http_reply_code ret;
struct upnp_wps_device_sm *sm = c->sm;
char *data = httpread_data_get(c->hread); /* body of http msg */
const char *action;
size_t action_len;
const char *replyname = NULL; /* argument name for the reply */
struct wpabuf *reply = NULL; /* data for the reply */
ret = UPNP_INVALID_ACTION;
action = web_get_action(c, filename, &action_len);
if (action == NULL)
goto bad;
/*
* There are quite a few possible actions. Although we appear to
* support them all here, not all of them are necessarily supported by
* callbacks at higher levels.
*/
if (!os_strncasecmp("GetDeviceInfo", action, action_len))
ret = web_process_get_device_info(sm, &reply, &replyname);
else if (!os_strncasecmp("PutMessage", action, action_len))
ret = web_process_put_message(sm, data, &reply, &replyname);
else if (!os_strncasecmp("GetAPSettings", action, action_len))
ret = web_process_get_ap_settings(sm, data, &reply,
&replyname);
else if (!os_strncasecmp("SetAPSettings", action, action_len))
ret = web_process_set_ap_settings(sm, data, &reply,
&replyname);
else if (!os_strncasecmp("DelAPSettings", action, action_len))
ret = web_process_del_ap_settings(sm, data, &reply,
&replyname);
else if (!os_strncasecmp("GetSTASettings", action, action_len))
ret = web_process_get_sta_settings(sm, data, &reply,
&replyname);
else if (!os_strncasecmp("SetSTASettings", action, action_len))
ret = web_process_set_sta_settings(sm, data, &reply,
&replyname);
else if (!os_strncasecmp("DelSTASettings", action, action_len))
ret = web_process_del_sta_settings(sm, data, &reply,
&replyname);
else if (!os_strncasecmp("PutWLANResponse", action, action_len))
ret = web_process_put_wlan_response(sm, data, &reply,
&replyname);
else if (!os_strncasecmp("SetSelectedRegistrar", action, action_len))
ret = web_process_set_selected_registrar(sm, data, &reply,
&replyname);
else if (!os_strncasecmp("RebootAP", action, action_len))
ret = web_process_reboot_ap(sm, data, &reply, &replyname);
else if (!os_strncasecmp("ResetAP", action, action_len))
ret = web_process_reset_ap(sm, data, &reply, &replyname);
else if (!os_strncasecmp("RebootSTA", action, action_len))
ret = web_process_reboot_sta(sm, data, &reply, &replyname);
else if (!os_strncasecmp("ResetSTA", action, action_len))
ret = web_process_reset_sta(sm, data, &reply, &replyname);
else
wpa_printf(MSG_INFO, "WPS UPnP: Unknown POST type");
bad:
if (ret != HTTP_OK)
wpa_printf(MSG_INFO, "WPS UPnP: POST failure ret=%d", ret);
web_connection_send_reply(c, ret, action, action_len, reply,
replyname);
wpabuf_free(reply);
}
/* Given that we have received a header w/ SUBSCRIBE, act upon it
*
* Format of SUBSCRIBE (case-insensitive):
*
* First line must be:
* SUBSCRIBE /wps_event HTTP/1.1
*
* Our response (if no error) which includes only required lines is:
* HTTP/1.1 200 OK
* Server: xx, UPnP/1.0, xx
* SID: uuid:xxxxxxxxx
* Timeout: Second-<n>
* Content-Length: 0
* Date: xxxx
*
* Header lines must end with \r\n
* Per RFC 2616, content-length: is not required but connection:close
* would appear to be required (given that we will be closing it!).
*/
static void web_connection_parse_subscribe(struct web_connection *c,
const char *filename)
{
struct upnp_wps_device_sm *sm = c->sm;
struct wpabuf *buf;
char *b;
char *hdr = httpread_hdr_get(c->hread);
char *h;
char *match;
int match_len;
char *end;
int len;
int got_nt = 0;
u8 uuid[UUID_LEN];
int got_uuid = 0;
char *callback_urls = NULL;
struct subscription *s = NULL;
enum http_reply_code ret = HTTP_INTERNAL_SERVER_ERROR;
buf = wpabuf_alloc(1000);
if (buf == NULL)
return;
/* Parse/validate headers */
h = hdr;
/* First line: SUBSCRIBE /wps_event HTTP/1.1
* has already been parsed.
*/
if (os_strcasecmp(filename, UPNP_WPS_DEVICE_EVENT_FILE) != 0) {
ret = HTTP_PRECONDITION_FAILED;
goto error;
}
wpa_printf(MSG_DEBUG, "WPS UPnP: HTTP SUBSCRIBE for event");
end = os_strchr(h, '\n');
for (; end != NULL; h = end + 1) {
/* Option line by option line */
h = end + 1;
end = os_strchr(h, '\n');
if (end == NULL)
break; /* no unterminated lines allowed */
/* NT assures that it is our type of subscription;
* not used for a renewl.
**/
match = "NT:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) == 0) {
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
match = "upnp:event";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) != 0) {
ret = HTTP_BAD_REQUEST;
goto error;
}
got_nt = 1;
continue;
}
/* HOST should refer to us */
#if 0
match = "HOST:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) == 0) {
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
.....
}
#endif
/* CALLBACK gives one or more URLs for NOTIFYs
* to be sent as a result of the subscription.
* Each URL is enclosed in angle brackets.
*/
match = "CALLBACK:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) == 0) {
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
len = end - h;
os_free(callback_urls);
callback_urls = os_malloc(len + 1);
if (callback_urls == NULL) {
ret = HTTP_INTERNAL_SERVER_ERROR;
goto error;
}
os_memcpy(callback_urls, h, len);
callback_urls[len] = 0;
continue;
}
/* SID is only for renewal */
match = "SID:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) == 0) {
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
match = "uuid:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) != 0) {
ret = HTTP_BAD_REQUEST;
goto error;
}
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
if (uuid_str2bin(h, uuid)) {
ret = HTTP_BAD_REQUEST;
goto error;
}
got_uuid = 1;
continue;
}
/* TIMEOUT is requested timeout, but apparently we can
* just ignore this.
*/
}
if (got_uuid) {
/* renewal */
if (callback_urls) {
ret = HTTP_BAD_REQUEST;
goto error;
}
s = subscription_renew(sm, uuid);
if (s == NULL) {
ret = HTTP_PRECONDITION_FAILED;
goto error;
}
} else if (callback_urls) {
if (!got_nt) {
ret = HTTP_PRECONDITION_FAILED;
goto error;
}
s = subscription_start(sm, callback_urls);
if (s == NULL) {
ret = HTTP_INTERNAL_SERVER_ERROR;
goto error;
}
callback_urls = NULL; /* is now owned by subscription */
} else {
ret = HTTP_PRECONDITION_FAILED;
goto error;
}
/* success */
http_put_reply_code(buf, HTTP_OK);
wpabuf_put_str(buf, http_server_hdr);
wpabuf_put_str(buf, http_connection_close);
wpabuf_put_str(buf, "Content-Length: 0\r\n");
wpabuf_put_str(buf, "SID: uuid:");
/* subscription id */
b = wpabuf_put(buf, 0);
uuid_bin2str(s->uuid, b, 80);
wpabuf_put(buf, os_strlen(b));
wpabuf_put_str(buf, "\r\n");
wpabuf_printf(buf, "Timeout: Second-%d\r\n", UPNP_SUBSCRIBE_SEC);
http_put_date(buf);
/* And empty line to terminate header: */
wpabuf_put_str(buf, "\r\n");
send_wpabuf(c->sd, buf);
wpabuf_free(buf);
os_free(callback_urls);
return;
error:
/* Per UPnP spec:
* Errors
* Incompatible headers
* 400 Bad Request. If SID header and one of NT or CALLBACK headers
* are present, the publisher must respond with HTTP error
* 400 Bad Request.
* Missing or invalid CALLBACK
* 412 Precondition Failed. If CALLBACK header is missing or does not
* contain a valid HTTP URL, the publisher must respond with HTTP
* error 412 Precondition Failed.
* Invalid NT
* 412 Precondition Failed. If NT header does not equal upnp:event,
* the publisher must respond with HTTP error 412 Precondition
* Failed.
* [For resubscription, use 412 if unknown uuid].
* Unable to accept subscription
* 5xx. If a publisher is not able to accept a subscription (such as
* due to insufficient resources), it must respond with a
* HTTP 500-series error code.
* 599 Too many subscriptions (not a standard HTTP error)
*/
http_put_empty(buf, ret);
send_wpabuf(c->sd, buf);
wpabuf_free(buf);
}
/* Given that we have received a header w/ UNSUBSCRIBE, act upon it
*
* Format of UNSUBSCRIBE (case-insensitive):
*
* First line must be:
* UNSUBSCRIBE /wps_event HTTP/1.1
*
* Our response (if no error) which includes only required lines is:
* HTTP/1.1 200 OK
* Content-Length: 0
*
* Header lines must end with \r\n
* Per RFC 2616, content-length: is not required but connection:close
* would appear to be required (given that we will be closing it!).
*/
static void web_connection_parse_unsubscribe(struct web_connection *c,
const char *filename)
{
struct upnp_wps_device_sm *sm = c->sm;
struct wpabuf *buf;
char *hdr = httpread_hdr_get(c->hread);
char *h;
char *match;
int match_len;
char *end;
u8 uuid[UUID_LEN];
int got_uuid = 0;
struct subscription *s = NULL;
enum http_reply_code ret = HTTP_INTERNAL_SERVER_ERROR;
/* Parse/validate headers */
h = hdr;
/* First line: UNSUBSCRIBE /wps_event HTTP/1.1
* has already been parsed.
*/
if (os_strcasecmp(filename, UPNP_WPS_DEVICE_EVENT_FILE) != 0) {
ret = HTTP_PRECONDITION_FAILED;
goto send_msg;
}
wpa_printf(MSG_DEBUG, "WPS UPnP: HTTP UNSUBSCRIBE for event");
end = os_strchr(h, '\n');
for (; end != NULL; h = end + 1) {
/* Option line by option line */
h = end + 1;
end = os_strchr(h, '\n');
if (end == NULL)
break; /* no unterminated lines allowed */
/* HOST should refer to us */
#if 0
match = "HOST:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) == 0) {
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
.....
}
#endif
/* SID is only for renewal */
match = "SID:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) == 0) {
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
match = "uuid:";
match_len = os_strlen(match);
if (os_strncasecmp(h, match, match_len) != 0) {
ret = HTTP_BAD_REQUEST;
goto send_msg;
}
h += match_len;
while (*h == ' ' || *h == '\t')
h++;
if (uuid_str2bin(h, uuid)) {
ret = HTTP_BAD_REQUEST;
goto send_msg;
}
got_uuid = 1;
continue;
}
}
if (got_uuid) {
s = subscription_find(sm, uuid);
if (s) {
wpa_printf(MSG_DEBUG, "WPS UPnP: Unsubscribing %p %s",
s,
(s && s->addr_list &&
s->addr_list->domain_and_port) ?
s->addr_list->domain_and_port : "-null-");
subscription_unlink(s);
subscription_destroy(s);
}
} else {
wpa_printf(MSG_INFO, "WPS UPnP: Unsubscribe fails (not "
"found)");
ret = HTTP_PRECONDITION_FAILED;
goto send_msg;
}
ret = HTTP_OK;
send_msg:
buf = wpabuf_alloc(200);
if (buf == NULL)
return;
http_put_empty(buf, ret);
send_wpabuf(c->sd, buf);
wpabuf_free(buf);
}
/* Send error in response to unknown requests */
static void web_connection_unimplemented(struct web_connection *c)
{
struct wpabuf *buf;
buf = wpabuf_alloc(200);
if (buf == NULL)
return;
http_put_empty(buf, HTTP_UNIMPLEMENTED);
send_wpabuf(c->sd, buf);
wpabuf_free(buf);
}
/* Called when we have gotten an apparently valid http request.
*/
static void web_connection_check_data(struct web_connection *c)
{
struct httpread *hread = c->hread;
enum httpread_hdr_type htype = httpread_hdr_type_get(hread);
/* char *data = httpread_data_get(hread); */
char *filename = httpread_uri_get(hread);
c->done = 1;
if (!filename) {
wpa_printf(MSG_INFO, "WPS UPnP: Could not get HTTP URI");
return;
}
/* Trim leading slashes from filename */
while (*filename == '/')
filename++;
wpa_printf(MSG_DEBUG, "WPS UPnP: Got HTTP request type %d from %s:%d",
htype, inet_ntoa(c->cli_addr.sin_addr),
htons(c->cli_addr.sin_port));
switch (htype) {
case HTTPREAD_HDR_TYPE_GET:
web_connection_parse_get(c, filename);
break;
case HTTPREAD_HDR_TYPE_POST:
web_connection_parse_post(c, filename);
break;
case HTTPREAD_HDR_TYPE_SUBSCRIBE:
web_connection_parse_subscribe(c, filename);
break;
case HTTPREAD_HDR_TYPE_UNSUBSCRIBE:
web_connection_parse_unsubscribe(c, filename);
break;
/* We are not required to support M-POST; just plain
* POST is supposed to work, so we only support that.
* If for some reason we need to support M-POST, it is
* mostly the same as POST, with small differences.
*/
default:
/* Send 501 for anything else */
web_connection_unimplemented(c);
break;
}
}
/* called back when we have gotten request */
static void web_connection_got_file_handler(struct httpread *handle,
void *cookie,
enum httpread_event en)
{
struct web_connection *c = cookie;
if (en == HTTPREAD_EVENT_FILE_READY)
web_connection_check_data(c);
web_connection_stop(c);
}
/* web_connection_start - Start web connection
* @sm: WPS UPnP state machine from upnp_wps_device_init()
* @sd: Socket descriptor
* @addr: Client address
*
* The socket descriptor sd is handed over for ownership by the WPS UPnP
* state machine.
*/
static void web_connection_start(struct upnp_wps_device_sm *sm,
int sd, struct sockaddr_in *addr)
{
struct web_connection *c = NULL;
/* if too many connections, bail */
if (sm->n_web_connections >= MAX_WEB_CONNECTIONS) {
close(sd);
return;
}
c = os_zalloc(sizeof(*c));
if (c == NULL)
return;
os_memcpy(&c->cli_addr, addr, sizeof(c->cli_addr));
c->sm = sm;
c->sd = sd;
#if 0
/*
* Setting non-blocking should not be necessary for read, and can mess
* up sending where blocking might be better.
*/
if (fcntl(sd, F_SETFL, O_NONBLOCK) != 0)
break;
#endif
c->hread = httpread_create(c->sd, web_connection_got_file_handler,
c /* cookie */,
WEB_CONNECTION_MAX_READ,
WEB_CONNECTION_TIMEOUT_SEC);
if (c->hread == NULL)
goto fail;
if (sm->web_connections) {
c->next = sm->web_connections;
c->prev = c->next->prev;
c->prev->next = c;
c->next->prev = c;
} else {
sm->web_connections = c->next = c->prev = c;
}
sm->n_web_connections++;
return;
fail:
if (c)
web_connection_stop(c);
}
/*
* Listening for web connections
* We have a single TCP listening port, and hand off connections as we get
* them.
*/
void web_listener_stop(struct upnp_wps_device_sm *sm)
{
if (sm->web_sd_registered) {
sm->web_sd_registered = 0;
eloop_unregister_sock(sm->web_sd, EVENT_TYPE_READ);
}
if (sm->web_sd >= 0)
close(sm->web_sd);
sm->web_sd = -1;
}
static void web_listener_handler(int sd, void *eloop_ctx, void *sock_ctx)
{
struct sockaddr_in addr;
socklen_t addr_len = sizeof(addr);
struct upnp_wps_device_sm *sm = sock_ctx;
int new_sd;
/* Create state for new connection */
/* Remember so we can cancel if need be */
new_sd = accept(sm->web_sd, (struct sockaddr *) &addr, &addr_len);
if (new_sd < 0) {
wpa_printf(MSG_ERROR, "WPS UPnP: web listener accept "
"errno=%d (%s) web_sd=%d",
errno, strerror(errno), sm->web_sd);
return;
}
web_connection_start(sm, new_sd, &addr);
}
int web_listener_start(struct upnp_wps_device_sm *sm)
{
struct sockaddr_in addr;
int port;
sm->web_sd = socket(AF_INET, SOCK_STREAM, 0);
if (sm->web_sd < 0)
goto fail;
if (fcntl(sm->web_sd, F_SETFL, O_NONBLOCK) != 0)
goto fail;
port = 49152; /* first non-reserved port */
for (;;) {
os_memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = sm->ip_addr;
addr.sin_port = htons(port);
if (bind(sm->web_sd, (struct sockaddr *) &addr,
sizeof(addr)) == 0)
break;
if (errno == EADDRINUSE) {
/* search for unused port */
if (++port == 65535)
goto fail;
continue;
}
goto fail;
}
if (listen(sm->web_sd, 10 /* max backlog */) != 0)
goto fail;
if (fcntl(sm->web_sd, F_SETFL, O_NONBLOCK) != 0)
goto fail;
if (eloop_register_sock(sm->web_sd, EVENT_TYPE_READ,
web_listener_handler, NULL, sm))
goto fail;
sm->web_sd_registered = 1;
sm->web_port = port;
return 0;
fail:
/* Error */
web_listener_stop(sm);
return -1;
}
Reference in a new issue View git blame Copy permalink