888 lines
24 KiB
C
888 lines
24 KiB
C
![]() |
/*
|
||
|
* UPnP SSDP for WPS
|
||
|
* 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 <sys/ioctl.h>
|
||
|
#include <net/route.h>
|
||
|
|
||
|
#include "common.h"
|
||
|
#include "uuid.h"
|
||
|
#include "eloop.h"
|
||
|
#include "wps.h"
|
||
|
#include "wps_upnp.h"
|
||
|
#include "wps_upnp_i.h"
|
||
|
|
||
|
#define UPNP_CACHE_SEC (UPNP_CACHE_SEC_MIN + 1) /* cache time we use */
|
||
|
#define UPNP_CACHE_SEC_MIN 1800 /* min cachable time per UPnP standard */
|
||
|
#define UPNP_ADVERTISE_REPEAT 2 /* no more than 3 */
|
||
|
#define MULTICAST_MAX_READ 1600 /* max bytes we'll read for UPD request */
|
||
|
#define MAX_MSEARCH 20 /* max simultaneous M-SEARCH replies ongoing */
|
||
|
#define SSDP_TARGET "239.0.0.0"
|
||
|
#define SSDP_NETMASK "255.0.0.0"
|
||
|
|
||
|
|
||
|
/* Check tokens for equality, where tokens consist of letters, digits,
|
||
|
* underscore and hyphen, and are matched case insensitive.
|
||
|
*/
|
||
|
static int token_eq(const char *s1, const char *s2)
|
||
|
{
|
||
|
int c1;
|
||
|
int c2;
|
||
|
int end1 = 0;
|
||
|
int end2 = 0;
|
||
|
for (;;) {
|
||
|
c1 = *s1++;
|
||
|
c2 = *s2++;
|
||
|
if (isalpha(c1) && isupper(c1))
|
||
|
c1 = tolower(c1);
|
||
|
if (isalpha(c2) && isupper(c2))
|
||
|
c2 = tolower(c2);
|
||
|
end1 = !(isalnum(c1) || c1 == '_' || c1 == '-');
|
||
|
end2 = !(isalnum(c2) || c2 == '_' || c2 == '-');
|
||
|
if (end1 || end2 || c1 != c2)
|
||
|
break;
|
||
|
}
|
||
|
return (end1 && end2); /* reached end of both words? */
|
||
|
}
|
||
|
|
||
|
|
||
|
/* Return length of token (see above for definition of token) */
|
||
|
static int token_length(const char *s)
|
||
|
{
|
||
|
const char *begin = s;
|
||
|
for (;; s++) {
|
||
|
int c = *s;
|
||
|
int end = !(isalnum(c) || c == '_' || c == '-');
|
||
|
if (end)
|
||
|
break;
|
||
|
}
|
||
|
return s - begin;
|
||
|
}
|
||
|
|
||
|
|
||
|
/* return length of interword separation.
|
||
|
* This accepts only spaces/tabs and thus will not traverse a line
|
||
|
* or buffer ending.
|
||
|
*/
|
||
|
static int word_separation_length(const char *s)
|
||
|
{
|
||
|
const char *begin = s;
|
||
|
for (;; s++) {
|
||
|
int c = *s;
|
||
|
if (c == ' ' || c == '\t')
|
||
|
continue;
|
||
|
break;
|
||
|
}
|
||
|
return s - begin;
|
||
|
}
|
||
|
|
||
|
|
||
|
/* No. of chars through (including) end of line */
|
||
|
static int line_length(const char *l)
|
||
|
{
|
||
|
const char *lp = l;
|
||
|
while (*lp && *lp != '\n')
|
||
|
lp++;
|
||
|
if (*lp == '\n')
|
||
|
lp++;
|
||
|
return lp - l;
|
||
|
}
|
||
|
|
||
|
|
||
|
/* No. of chars excluding trailing whitespace */
|
||
|
static int line_length_stripped(const char *l)
|
||
|
{
|
||
|
const char *lp = l + line_length(l);
|
||
|
while (lp > l && !isgraph(lp[-1]))
|
||
|
lp--;
|
||
|
return lp - l;
|
||
|
}
|
||
|
|
||
|
|
||
|
static int str_starts(const char *str, const char *start)
|
||
|
{
|
||
|
return os_strncmp(str, start, os_strlen(start)) == 0;
|
||
|
}
|
||
|
|
||
|
|
||
|
/***************************************************************************
|
||
|
* Advertisements.
|
||
|
* These are multicast to the world to tell them we are here.
|
||
|
* The individual packets are spread out in time to limit loss,
|
||
|
* and then after a much longer period of time the whole sequence
|
||
|
* is repeated again (for NOTIFYs only).
|
||
|
**************************************************************************/
|
||
|
|
||
|
/**
|
||
|
* next_advertisement - Build next message and advance the state machine
|
||
|
* @a: Advertisement state
|
||
|
* @islast: Buffer for indicating whether this is the last message (= 1)
|
||
|
* Returns: The new message (caller is responsible for freeing this)
|
||
|
*
|
||
|
* Note: next_advertisement is shared code with msearchreply_* functions
|
||
|
*/
|
||
|
static struct wpabuf *
|
||
|
next_advertisement(struct advertisement_state_machine *a, int *islast)
|
||
|
{
|
||
|
struct wpabuf *msg;
|
||
|
char *NTString = "";
|
||
|
char uuid_string[80];
|
||
|
|
||
|
*islast = 0;
|
||
|
uuid_bin2str(a->sm->wps->uuid, uuid_string, sizeof(uuid_string));
|
||
|
msg = wpabuf_alloc(800); /* more than big enough */
|
||
|
if (msg == NULL)
|
||
|
goto fail;
|
||
|
switch (a->type) {
|
||
|
case ADVERTISE_UP:
|
||
|
case ADVERTISE_DOWN:
|
||
|
NTString = "NT";
|
||
|
wpabuf_put_str(msg, "NOTIFY * HTTP/1.1\r\n");
|
||
|
wpabuf_printf(msg, "HOST: %s:%d\r\n",
|
||
|
UPNP_MULTICAST_ADDRESS, UPNP_MULTICAST_PORT);
|
||
|
wpabuf_printf(msg, "CACHE-CONTROL: max-age=%d\r\n",
|
||
|
UPNP_CACHE_SEC);
|
||
|
wpabuf_printf(msg, "NTS: %s\r\n",
|
||
|
(a->type == ADVERTISE_UP ?
|
||
|
"ssdp:alive" : "ssdp:byebye"));
|
||
|
break;
|
||
|
case MSEARCH_REPLY:
|
||
|
NTString = "ST";
|
||
|
wpabuf_put_str(msg, "HTTP/1.1 200 OK\r\n");
|
||
|
wpabuf_printf(msg, "CACHE-CONTROL: max-age=%d\r\n",
|
||
|
UPNP_CACHE_SEC);
|
||
|
|
||
|
wpabuf_put_str(msg, "DATE: ");
|
||
|
format_date(msg);
|
||
|
wpabuf_put_str(msg, "\r\n");
|
||
|
|
||
|
wpabuf_put_str(msg, "EXT:\r\n");
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
if (a->type != ADVERTISE_DOWN) {
|
||
|
/* Where others may get our XML files from */
|
||
|
wpabuf_printf(msg, "LOCATION: http://%s:%d/%s\r\n",
|
||
|
a->sm->ip_addr_text, a->sm->web_port,
|
||
|
UPNP_WPS_DEVICE_XML_FILE);
|
||
|
}
|
||
|
|
||
|
/* The SERVER line has three comma-separated fields:
|
||
|
* operating system / version
|
||
|
* upnp version
|
||
|
* software package / version
|
||
|
* However, only the UPnP version is really required, the
|
||
|
* others can be place holders... for security reasons
|
||
|
* it is better to NOT provide extra information.
|
||
|
*/
|
||
|
wpabuf_put_str(msg, "SERVER: Unspecified, UPnP/1.0, Unspecified\r\n");
|
||
|
|
||
|
switch (a->state / UPNP_ADVERTISE_REPEAT) {
|
||
|
case 0:
|
||
|
wpabuf_printf(msg, "%s: upnp:rootdevice\r\n", NTString);
|
||
|
wpabuf_printf(msg, "USN: uuid:%s::upnp:rootdevice\r\n",
|
||
|
uuid_string);
|
||
|
break;
|
||
|
case 1:
|
||
|
wpabuf_printf(msg, "%s: uuid:%s\r\n", NTString, uuid_string);
|
||
|
wpabuf_printf(msg, "USN: uuid:%s\r\n", uuid_string);
|
||
|
break;
|
||
|
case 2:
|
||
|
wpabuf_printf(msg, "%s: urn:schemas-wifialliance-org:device:"
|
||
|
"WFADevice:1\r\n", NTString);
|
||
|
wpabuf_printf(msg, "USN: uuid:%s::urn:schemas-wifialliance-"
|
||
|
"org:device:WFADevice:1\r\n", uuid_string);
|
||
|
break;
|
||
|
case 3:
|
||
|
wpabuf_printf(msg, "%s: urn:schemas-wifialliance-org:service:"
|
||
|
"WFAWLANConfig:1\r\n", NTString);
|
||
|
wpabuf_printf(msg, "USN: uuid:%s::urn:schemas-wifialliance-"
|
||
|
"org:service:WFAWLANConfig:1\r\n", uuid_string);
|
||
|
break;
|
||
|
}
|
||
|
wpabuf_put_str(msg, "\r\n");
|
||
|
|
||
|
if (a->state + 1 >= 4 * UPNP_ADVERTISE_REPEAT)
|
||
|
*islast = 1;
|
||
|
|
||
|
return msg;
|
||
|
|
||
|
fail:
|
||
|
wpabuf_free(msg);
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
|
||
|
static void advertisement_state_machine_handler(void *eloop_data,
|
||
|
void *user_ctx);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* advertisement_state_machine_stop - Stop SSDP advertisements
|
||
|
* @sm: WPS UPnP state machine from upnp_wps_device_init()
|
||
|
*/
|
||
|
void advertisement_state_machine_stop(struct upnp_wps_device_sm *sm)
|
||
|
{
|
||
|
eloop_cancel_timeout(advertisement_state_machine_handler, NULL, sm);
|
||
|
}
|
||
|
|
||
|
|
||
|
static void advertisement_state_machine_handler(void *eloop_data,
|
||
|
void *user_ctx)
|
||
|
{
|
||
|
struct upnp_wps_device_sm *sm = user_ctx;
|
||
|
struct advertisement_state_machine *a = &sm->advertisement;
|
||
|
struct wpabuf *msg;
|
||
|
int next_timeout_msec = 100;
|
||
|
int next_timeout_sec = 0;
|
||
|
struct sockaddr_in dest;
|
||
|
int islast = 0;
|
||
|
|
||
|
/*
|
||
|
* Each is sent twice (in case lost) w/ 100 msec delay between;
|
||
|
* spec says no more than 3 times.
|
||
|
* One pair for rootdevice, one pair for uuid, and a pair each for
|
||
|
* each of the two urns.
|
||
|
* The entire sequence must be repeated before cache control timeout
|
||
|
* (which is min 1800 seconds),
|
||
|
* recommend random portion of half of the advertised cache control age
|
||
|
* to ensure against loss... perhaps 1800/4 + rand*1800/4 ?
|
||
|
* Delay random interval < 100 msec prior to initial sending.
|
||
|
* TTL of 4
|
||
|
*/
|
||
|
|
||
|
wpa_printf(MSG_MSGDUMP, "WPS UPnP: Advertisement state=%d", a->state);
|
||
|
msg = next_advertisement(a, &islast);
|
||
|
if (msg == NULL)
|
||
|
return;
|
||
|
|
||
|
os_memset(&dest, 0, sizeof(dest));
|
||
|
dest.sin_family = AF_INET;
|
||
|
dest.sin_addr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS);
|
||
|
dest.sin_port = htons(UPNP_MULTICAST_PORT);
|
||
|
|
||
|
if (sendto(sm->multicast_sd, wpabuf_head(msg), wpabuf_len(msg), 0,
|
||
|
(struct sockaddr *) &dest, sizeof(dest)) == -1) {
|
||
|
wpa_printf(MSG_ERROR, "WPS UPnP: Advertisement sendto failed:"
|
||
|
"%d (%s)", errno, strerror(errno));
|
||
|
next_timeout_msec = 0;
|
||
|
next_timeout_sec = 10; /* ... later */
|
||
|
} else if (islast) {
|
||
|
a->state = 0; /* wrap around */
|
||
|
if (a->type == ADVERTISE_DOWN) {
|
||
|
wpa_printf(MSG_DEBUG, "WPS UPnP: ADVERTISE_DOWN->UP");
|
||
|
a->type = ADVERTISE_UP;
|
||
|
/* do it all over again right away */
|
||
|
} else {
|
||
|
u16 r;
|
||
|
/*
|
||
|
* Start over again after a long timeout
|
||
|
* (see notes above)
|
||
|
*/
|
||
|
next_timeout_msec = 0;
|
||
|
os_get_random((void *) &r, sizeof(r));
|
||
|
next_timeout_sec = UPNP_CACHE_SEC / 4 +
|
||
|
(((UPNP_CACHE_SEC / 4) * r) >> 16);
|
||
|
sm->advertise_count++;
|
||
|
wpa_printf(MSG_DEBUG, "WPS UPnP: ADVERTISE_UP (#%u); "
|
||
|
"next in %d sec",
|
||
|
sm->advertise_count, next_timeout_sec);
|
||
|
}
|
||
|
} else {
|
||
|
a->state++;
|
||
|
}
|
||
|
|
||
|
wpabuf_free(msg);
|
||
|
|
||
|
eloop_register_timeout(next_timeout_sec, next_timeout_msec,
|
||
|
advertisement_state_machine_handler, NULL, sm);
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* advertisement_state_machine_start - Start SSDP advertisements
|
||
|
* @sm: WPS UPnP state machine from upnp_wps_device_init()
|
||
|
* Returns: 0 on success, -1 on failure
|
||
|
*/
|
||
|
int advertisement_state_machine_start(struct upnp_wps_device_sm *sm)
|
||
|
{
|
||
|
struct advertisement_state_machine *a = &sm->advertisement;
|
||
|
int next_timeout_msec;
|
||
|
|
||
|
advertisement_state_machine_stop(sm);
|
||
|
|
||
|
/*
|
||
|
* Start out advertising down, this automatically switches
|
||
|
* to advertising up which signals our restart.
|
||
|
*/
|
||
|
a->type = ADVERTISE_DOWN;
|
||
|
a->state = 0;
|
||
|
a->sm = sm;
|
||
|
/* (other fields not used here) */
|
||
|
|
||
|
/* First timeout should be random interval < 100 msec */
|
||
|
next_timeout_msec = (100 * (os_random() & 0xFF)) >> 8;
|
||
|
return eloop_register_timeout(0, next_timeout_msec,
|
||
|
advertisement_state_machine_handler,
|
||
|
NULL, sm);
|
||
|
}
|
||
|
|
||
|
|
||
|
/***************************************************************************
|
||
|
* M-SEARCH replies
|
||
|
* These are very similar to the multicast advertisements, with some
|
||
|
* small changes in data content; and they are sent (UDP) to a specific
|
||
|
* unicast address instead of multicast.
|
||
|
* They are sent in response to a UDP M-SEARCH packet.
|
||
|
**************************************************************************/
|
||
|
|
||
|
static void msearchreply_state_machine_handler(void *eloop_data,
|
||
|
void *user_ctx);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* msearchreply_state_machine_stop - Stop M-SEARCH reply state machine
|
||
|
* @a: Selected advertisement/reply state
|
||
|
*/
|
||
|
void msearchreply_state_machine_stop(struct advertisement_state_machine *a)
|
||
|
{
|
||
|
struct upnp_wps_device_sm *sm = a->sm;
|
||
|
wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH stop");
|
||
|
if (a->next == a) {
|
||
|
sm->msearch_replies = NULL;
|
||
|
} else {
|
||
|
if (sm->msearch_replies == a) {
|
||
|
sm->msearch_replies = a->next;
|
||
|
}
|
||
|
a->next->prev = a->prev;
|
||
|
a->prev->next = a->next;
|
||
|
}
|
||
|
os_free(a);
|
||
|
sm->n_msearch_replies--;
|
||
|
}
|
||
|
|
||
|
|
||
|
static void msearchreply_state_machine_handler(void *eloop_data,
|
||
|
void *user_ctx)
|
||
|
{
|
||
|
struct advertisement_state_machine *a = user_ctx;
|
||
|
struct upnp_wps_device_sm *sm = a->sm;
|
||
|
struct wpabuf *msg;
|
||
|
int next_timeout_msec = 100;
|
||
|
int next_timeout_sec = 0;
|
||
|
int islast = 0;
|
||
|
|
||
|
/*
|
||
|
* Each response is sent twice (in case lost) w/ 100 msec delay
|
||
|
* between; spec says no more than 3 times.
|
||
|
* One pair for rootdevice, one pair for uuid, and a pair each for
|
||
|
* each of the two urns.
|
||
|
*/
|
||
|
|
||
|
/* TODO: should only send the requested response types */
|
||
|
|
||
|
wpa_printf(MSG_MSGDUMP, "WPS UPnP: M-SEARCH reply state=%d (%s:%d)",
|
||
|
a->state, inet_ntoa(a->client.sin_addr),
|
||
|
ntohs(a->client.sin_port));
|
||
|
msg = next_advertisement(a, &islast);
|
||
|
if (msg == NULL)
|
||
|
return;
|
||
|
|
||
|
/*
|
||
|
* Send it on the multicast socket to avoid having to set up another
|
||
|
* socket.
|
||
|
*/
|
||
|
if (sendto(sm->multicast_sd, wpabuf_head(msg), wpabuf_len(msg), 0,
|
||
|
(struct sockaddr *) &a->client, sizeof(a->client)) < 0) {
|
||
|
wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH reply sendto "
|
||
|
"errno %d (%s) for %s:%d",
|
||
|
errno, strerror(errno),
|
||
|
inet_ntoa(a->client.sin_addr),
|
||
|
ntohs(a->client.sin_port));
|
||
|
/* Ignore error and hope for the best */
|
||
|
}
|
||
|
wpabuf_free(msg);
|
||
|
if (islast) {
|
||
|
wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH reply done");
|
||
|
msearchreply_state_machine_stop(a);
|
||
|
return;
|
||
|
}
|
||
|
a->state++;
|
||
|
|
||
|
wpa_printf(MSG_MSGDUMP, "WPS UPnP: M-SEARCH reply in %d.%03d sec",
|
||
|
next_timeout_sec, next_timeout_msec);
|
||
|
eloop_register_timeout(next_timeout_sec, next_timeout_msec,
|
||
|
msearchreply_state_machine_handler, sm, a);
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* msearchreply_state_machine_start - Reply to M-SEARCH discovery request
|
||
|
* @sm: WPS UPnP state machine from upnp_wps_device_init()
|
||
|
* @client: Client address
|
||
|
* @mx: Maximum delay in seconds
|
||
|
*
|
||
|
* Use TTL of 4 (this was done when socket set up).
|
||
|
* A response should be given in randomized portion of min(MX,120) seconds
|
||
|
*
|
||
|
* UPnP-arch-DeviceArchitecture, 1.2.3:
|
||
|
* To be found, a device must send a UDP response to the source IP address and
|
||
|
* port that sent the request to the multicast channel. Devices respond if the
|
||
|
* ST header of the M-SEARCH request is "ssdp:all", "upnp:rootdevice", "uuid:"
|
||
|
* followed by a UUID that exactly matches one advertised by the device.
|
||
|
*/
|
||
|
static void msearchreply_state_machine_start(struct upnp_wps_device_sm *sm,
|
||
|
struct sockaddr_in *client,
|
||
|
int mx)
|
||
|
{
|
||
|
struct advertisement_state_machine *a;
|
||
|
int next_timeout_sec;
|
||
|
int next_timeout_msec;
|
||
|
|
||
|
wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH reply start (%d "
|
||
|
"outstanding)", sm->n_msearch_replies);
|
||
|
if (sm->n_msearch_replies >= MAX_MSEARCH) {
|
||
|
wpa_printf(MSG_INFO, "WPS UPnP: Too many outstanding "
|
||
|
"M-SEARCH replies");
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
a = os_zalloc(sizeof(*a));
|
||
|
if (a == NULL)
|
||
|
return;
|
||
|
a->type = MSEARCH_REPLY;
|
||
|
a->state = 0;
|
||
|
a->sm = sm;
|
||
|
os_memcpy(&a->client, client, sizeof(client));
|
||
|
/* Wait time depending on MX value */
|
||
|
next_timeout_msec = (1000 * mx * (os_random() & 0xFF)) >> 8;
|
||
|
next_timeout_sec = next_timeout_msec / 1000;
|
||
|
next_timeout_msec = next_timeout_msec % 1000;
|
||
|
if (eloop_register_timeout(next_timeout_sec, next_timeout_msec,
|
||
|
msearchreply_state_machine_handler, sm,
|
||
|
a)) {
|
||
|
/* No way to recover (from malloc failure) */
|
||
|
goto fail;
|
||
|
}
|
||
|
/* Remember for future cleanup */
|
||
|
if (sm->msearch_replies) {
|
||
|
a->next = sm->msearch_replies;
|
||
|
a->prev = a->next->prev;
|
||
|
a->prev->next = a;
|
||
|
a->next->prev = a;
|
||
|
} else {
|
||
|
sm->msearch_replies = a->next = a->prev = a;
|
||
|
}
|
||
|
sm->n_msearch_replies++;
|
||
|
return;
|
||
|
|
||
|
fail:
|
||
|
wpa_printf(MSG_INFO, "WPS UPnP: M-SEARCH reply failure!");
|
||
|
eloop_cancel_timeout(msearchreply_state_machine_handler, sm, a);
|
||
|
os_free(a);
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* ssdp_parse_msearch - Process a received M-SEARCH
|
||
|
* @sm: WPS UPnP state machine from upnp_wps_device_init()
|
||
|
* @client: Client address
|
||
|
* @data: NULL terminated M-SEARCH message
|
||
|
*
|
||
|
* Given that we have received a header w/ M-SEARCH, act upon it
|
||
|
*
|
||
|
* Format of M-SEARCH (case insensitive!):
|
||
|
*
|
||
|
* First line must be:
|
||
|
* M-SEARCH * HTTP/1.1
|
||
|
* Other lines in arbitrary order:
|
||
|
* HOST:239.255.255.250:1900
|
||
|
* ST:<varies -- must match>
|
||
|
* MAN:"ssdp:discover"
|
||
|
* MX:<varies>
|
||
|
*
|
||
|
* It should be noted that when Microsoft Vista is still learning its IP
|
||
|
* address, it sends out host lines like: HOST:[FF02::C]:1900
|
||
|
*/
|
||
|
static void ssdp_parse_msearch(struct upnp_wps_device_sm *sm,
|
||
|
struct sockaddr_in *client, const char *data)
|
||
|
{
|
||
|
const char *start = data;
|
||
|
const char *end;
|
||
|
int got_host = 0;
|
||
|
int got_st = 0, st_match = 0;
|
||
|
int got_man = 0;
|
||
|
int got_mx = 0;
|
||
|
int mx = 0;
|
||
|
|
||
|
/*
|
||
|
* Skip first line M-SEARCH * HTTP/1.1
|
||
|
* (perhaps we should check remainder of the line for syntax)
|
||
|
*/
|
||
|
data += line_length(data);
|
||
|
|
||
|
/* Parse remaining lines */
|
||
|
for (; *data != '\0'; data += line_length(data)) {
|
||
|
end = data + line_length_stripped(data);
|
||
|
if (token_eq(data, "host")) {
|
||
|
/* The host line indicates who the packet
|
||
|
* is addressed to... but do we really care?
|
||
|
* Note that Microsoft sometimes does funny
|
||
|
* stuff with the HOST: line.
|
||
|
*/
|
||
|
#if 0 /* could be */
|
||
|
data += token_length(data);
|
||
|
data += word_separation_length(data);
|
||
|
if (*data != ':')
|
||
|
goto bad;
|
||
|
data++;
|
||
|
data += word_separation_length(data);
|
||
|
/* UPNP_MULTICAST_ADDRESS */
|
||
|
if (!str_starts(data, "239.255.255.250"))
|
||
|
goto bad;
|
||
|
data += os_strlen("239.255.255.250");
|
||
|
if (*data == ':') {
|
||
|
if (!str_starts(data, ":1900"))
|
||
|
goto bad;
|
||
|
}
|
||
|
#endif /* could be */
|
||
|
got_host = 1;
|
||
|
continue;
|
||
|
} else if (token_eq(data, "st")) {
|
||
|
/* There are a number of forms; we look
|
||
|
* for one that matches our case.
|
||
|
*/
|
||
|
got_st = 1;
|
||
|
data += token_length(data);
|
||
|
data += word_separation_length(data);
|
||
|
if (*data != ':')
|
||
|
continue;
|
||
|
data++;
|
||
|
data += word_separation_length(data);
|
||
|
if (str_starts(data, "ssdp:all")) {
|
||
|
st_match = 1;
|
||
|
continue;
|
||
|
}
|
||
|
if (str_starts(data, "upnp:rootdevice")) {
|
||
|
st_match = 1;
|
||
|
continue;
|
||
|
}
|
||
|
if (str_starts(data, "uuid:")) {
|
||
|
char uuid_string[80];
|
||
|
data += os_strlen("uuid:");
|
||
|
uuid_bin2str(sm->wps->uuid, uuid_string,
|
||
|
sizeof(uuid_string));
|
||
|
if (str_starts(data, uuid_string))
|
||
|
st_match = 1;
|
||
|
continue;
|
||
|
}
|
||
|
#if 0
|
||
|
/* FIX: should we really reply to IGD string? */
|
||
|
if (str_starts(data, "urn:schemas-upnp-org:device:"
|
||
|
"InternetGatewayDevice:1")) {
|
||
|
st_match = 1;
|
||
|
continue;
|
||
|
}
|
||
|
#endif
|
||
|
if (str_starts(data, "urn:schemas-wifialliance-org:"
|
||
|
"service:WFAWLANConfig:1")) {
|
||
|
st_match = 1;
|
||
|
continue;
|
||
|
}
|
||
|
if (str_starts(data, "urn:schemas-wifialliance-org:"
|
||
|
"device:WFADevice:1")) {
|
||
|
st_match = 1;
|
||
|
continue;
|
||
|
}
|
||
|
continue;
|
||
|
} else if (token_eq(data, "man")) {
|
||
|
data += token_length(data);
|
||
|
data += word_separation_length(data);
|
||
|
if (*data != ':')
|
||
|
continue;
|
||
|
data++;
|
||
|
data += word_separation_length(data);
|
||
|
if (!str_starts(data, "\"ssdp:discover\"")) {
|
||
|
wpa_printf(MSG_DEBUG, "WPS UPnP: Unexpected "
|
||
|
"M-SEARCH man-field");
|
||
|
goto bad;
|
||
|
}
|
||
|
got_man = 1;
|
||
|
continue;
|
||
|
} else if (token_eq(data, "mx")) {
|
||
|
data += token_length(data);
|
||
|
data += word_separation_length(data);
|
||
|
if (*data != ':')
|
||
|
continue;
|
||
|
data++;
|
||
|
data += word_separation_length(data);
|
||
|
mx = atol(data);
|
||
|
got_mx = 1;
|
||
|
continue;
|
||
|
}
|
||
|
/* ignore anything else */
|
||
|
}
|
||
|
if (!got_host || !got_st || !got_man || !got_mx || mx < 0) {
|
||
|
wpa_printf(MSG_DEBUG, "WPS UPnP: Invalid M-SEARCH: %d %d %d "
|
||
|
"%d mx=%d", got_host, got_st, got_man, got_mx, mx);
|
||
|
goto bad;
|
||
|
}
|
||
|
if (!st_match) {
|
||
|
wpa_printf(MSG_DEBUG, "WPS UPnP: Ignored M-SEARCH (no ST "
|
||
|
"match)");
|
||
|
return;
|
||
|
}
|
||
|
if (mx > 120)
|
||
|
mx = 120; /* UPnP-arch-DeviceArchitecture, 1.2.3 */
|
||
|
msearchreply_state_machine_start(sm, client, mx);
|
||
|
return;
|
||
|
|
||
|
bad:
|
||
|
wpa_printf(MSG_INFO, "WPS UPnP: Failed to parse M-SEARCH");
|
||
|
wpa_printf(MSG_MSGDUMP, "WPS UPnP: M-SEARCH data:\n%s", start);
|
||
|
}
|
||
|
|
||
|
|
||
|
/* Listening for (UDP) discovery (M-SEARCH) packets */
|
||
|
|
||
|
/**
|
||
|
* ssdp_listener_stop - Stop SSDP listered
|
||
|
* @sm: WPS UPnP state machine from upnp_wps_device_init()
|
||
|
*
|
||
|
* This function stops the SSDP listerner that was started by calling
|
||
|
* ssdp_listener_start().
|
||
|
*/
|
||
|
void ssdp_listener_stop(struct upnp_wps_device_sm *sm)
|
||
|
{
|
||
|
if (sm->ssdp_sd_registered) {
|
||
|
eloop_unregister_sock(sm->ssdp_sd, EVENT_TYPE_READ);
|
||
|
sm->ssdp_sd_registered = 0;
|
||
|
}
|
||
|
|
||
|
if (sm->ssdp_sd != -1) {
|
||
|
close(sm->ssdp_sd);
|
||
|
sm->ssdp_sd = -1;
|
||
|
}
|
||
|
|
||
|
eloop_cancel_timeout(msearchreply_state_machine_handler, sm,
|
||
|
ELOOP_ALL_CTX);
|
||
|
}
|
||
|
|
||
|
|
||
|
static void ssdp_listener_handler(int sd, void *eloop_ctx, void *sock_ctx)
|
||
|
{
|
||
|
struct upnp_wps_device_sm *sm = sock_ctx;
|
||
|
struct sockaddr_in addr; /* client address */
|
||
|
socklen_t addr_len;
|
||
|
int nread;
|
||
|
char buf[MULTICAST_MAX_READ], *pos;
|
||
|
|
||
|
addr_len = sizeof(addr);
|
||
|
nread = recvfrom(sm->ssdp_sd, buf, sizeof(buf) - 1, 0,
|
||
|
(struct sockaddr *) &addr, &addr_len);
|
||
|
if (nread <= 0)
|
||
|
return;
|
||
|
buf[nread] = '\0'; /* need null termination for algorithm */
|
||
|
|
||
|
if (str_starts(buf, "NOTIFY ")) {
|
||
|
/*
|
||
|
* Silently ignore NOTIFYs to avoid filling debug log with
|
||
|
* unwanted messages.
|
||
|
*/
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
pos = os_strchr(buf, '\n');
|
||
|
if (pos)
|
||
|
*pos = '\0';
|
||
|
wpa_printf(MSG_MSGDUMP, "WPS UPnP: Received SSDP packet from %s:%d: "
|
||
|
"%s", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port), buf);
|
||
|
if (pos)
|
||
|
*pos = '\n';
|
||
|
|
||
|
/* Parse first line */
|
||
|
if (os_strncasecmp(buf, "M-SEARCH", os_strlen("M-SEARCH")) == 0 &&
|
||
|
!isgraph(buf[strlen("M-SEARCH")])) {
|
||
|
ssdp_parse_msearch(sm, &addr, buf);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
/* Ignore anything else */
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* ssdp_listener_start - Set up for receiving discovery (UDP) packets
|
||
|
* @sm: WPS UPnP state machine from upnp_wps_device_init()
|
||
|
* Returns: 0 on success, -1 on failure
|
||
|
*
|
||
|
* The SSDP listerner is stopped by calling ssdp_listener_stop().
|
||
|
*/
|
||
|
int ssdp_listener_start(struct upnp_wps_device_sm *sm)
|
||
|
{
|
||
|
int sd = -1;
|
||
|
struct sockaddr_in addr;
|
||
|
struct ip_mreq mcast_addr;
|
||
|
int on = 1;
|
||
|
/* per UPnP spec, keep IP packet time to live (TTL) small */
|
||
|
unsigned char ttl = 4;
|
||
|
|
||
|
sm->ssdp_sd = sd = socket(AF_INET, SOCK_DGRAM, 0);
|
||
|
if (sd < 0)
|
||
|
goto fail;
|
||
|
if (fcntl(sd, F_SETFL, O_NONBLOCK) != 0)
|
||
|
goto fail;
|
||
|
if (setsockopt(sd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)))
|
||
|
goto fail;
|
||
|
os_memset(&addr, 0, sizeof(addr));
|
||
|
addr.sin_family = AF_INET;
|
||
|
addr.sin_addr.s_addr = htonl(INADDR_ANY);
|
||
|
addr.sin_port = htons(UPNP_MULTICAST_PORT);
|
||
|
if (bind(sd, (struct sockaddr *) &addr, sizeof(addr)))
|
||
|
goto fail;
|
||
|
os_memset(&mcast_addr, 0, sizeof(mcast_addr));
|
||
|
mcast_addr.imr_interface.s_addr = htonl(INADDR_ANY);
|
||
|
mcast_addr.imr_multiaddr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS);
|
||
|
if (setsockopt(sd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
|
||
|
(char *) &mcast_addr, sizeof(mcast_addr)))
|
||
|
goto fail;
|
||
|
if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_TTL,
|
||
|
&ttl, sizeof(ttl)))
|
||
|
goto fail;
|
||
|
if (eloop_register_sock(sd, EVENT_TYPE_READ, ssdp_listener_handler,
|
||
|
NULL, sm))
|
||
|
goto fail;
|
||
|
sm->ssdp_sd_registered = 1;
|
||
|
return 0;
|
||
|
|
||
|
fail:
|
||
|
/* Error */
|
||
|
wpa_printf(MSG_ERROR, "WPS UPnP: ssdp_listener_start failed");
|
||
|
ssdp_listener_stop(sm);
|
||
|
return -1;
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* add_ssdp_network - Add routing entry for SSDP
|
||
|
* @net_if: Selected network interface name
|
||
|
* Returns: 0 on success, -1 on failure
|
||
|
*
|
||
|
* This function assures that the multicast address will be properly
|
||
|
* handled by Linux networking code (by a modification to routing tables).
|
||
|
* This must be done per network interface. It really only needs to be done
|
||
|
* once after booting up, but it does not hurt to call this more frequently
|
||
|
* "to be safe".
|
||
|
*/
|
||
|
int add_ssdp_network(char *net_if)
|
||
|
{
|
||
|
int ret = -1;
|
||
|
int sock = -1;
|
||
|
struct rtentry rt;
|
||
|
struct sockaddr_in *sin;
|
||
|
|
||
|
if (!net_if)
|
||
|
goto fail;
|
||
|
|
||
|
os_memset(&rt, 0, sizeof(rt));
|
||
|
sock = socket(AF_INET, SOCK_DGRAM, 0);
|
||
|
if (sock < 0)
|
||
|
goto fail;
|
||
|
|
||
|
rt.rt_dev = net_if;
|
||
|
sin = (struct sockaddr_in *) &rt.rt_dst;
|
||
|
sin->sin_family = AF_INET;
|
||
|
sin->sin_port = 0;
|
||
|
sin->sin_addr.s_addr = inet_addr(SSDP_TARGET);
|
||
|
sin = (struct sockaddr_in *) &rt.rt_genmask;
|
||
|
sin->sin_family = AF_INET;
|
||
|
sin->sin_port = 0;
|
||
|
sin->sin_addr.s_addr = inet_addr(SSDP_NETMASK);
|
||
|
rt.rt_flags = RTF_UP;
|
||
|
if (ioctl(sock, SIOCADDRT, &rt) < 0) {
|
||
|
if (errno == EPERM) {
|
||
|
wpa_printf(MSG_DEBUG, "add_ssdp_network: No "
|
||
|
"permissions to add routing table entry");
|
||
|
/* Continue to allow testing as non-root */
|
||
|
} else if (errno != EEXIST) {
|
||
|
wpa_printf(MSG_INFO, "add_ssdp_network() ioctl errno "
|
||
|
"%d (%s)", errno, strerror(errno));
|
||
|
goto fail;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
ret = 0;
|
||
|
|
||
|
fail:
|
||
|
if (sock >= 0)
|
||
|
close(sock);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
|
||
|
/**
|
||
|
* ssdp_open_multicast - Open socket for sending multicast SSDP messages
|
||
|
* @sm: WPS UPnP state machine from upnp_wps_device_init()
|
||
|
* Returns: 0 on success, -1 on failure
|
||
|
*/
|
||
|
int ssdp_open_multicast(struct upnp_wps_device_sm *sm)
|
||
|
{
|
||
|
int sd = -1;
|
||
|
/* per UPnP-arch-DeviceArchitecture, 1. Discovery, keep IP packet
|
||
|
* time to live (TTL) small */
|
||
|
unsigned char ttl = 4;
|
||
|
|
||
|
sm->multicast_sd = sd = socket(AF_INET, SOCK_DGRAM, 0);
|
||
|
if (sd < 0)
|
||
|
return -1;
|
||
|
|
||
|
#if 0 /* maybe ok if we sometimes block on writes */
|
||
|
if (fcntl(sd, F_SETFL, O_NONBLOCK) != 0)
|
||
|
return -1;
|
||
|
#endif
|
||
|
|
||
|
if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_IF,
|
||
|
&sm->ip_addr, sizeof(sm->ip_addr)))
|
||
|
return -1;
|
||
|
if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_TTL,
|
||
|
&ttl, sizeof(ttl)))
|
||
|
return -1;
|
||
|
|
||
|
#if 0 /* not needed, because we don't receive using multicast_sd */
|
||
|
{
|
||
|
struct ip_mreq mreq;
|
||
|
mreq.imr_multiaddr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS);
|
||
|
mreq.imr_interface.s_addr = sm->ip_addr;
|
||
|
wpa_printf(MSG_DEBUG, "WPS UPnP: Multicast addr 0x%x if addr "
|
||
|
"0x%x",
|
||
|
mreq.imr_multiaddr.s_addr,
|
||
|
mreq.imr_interface.s_addr);
|
||
|
if (setsockopt(sd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq,
|
||
|
sizeof(mreq))) {
|
||
|
wpa_printf(MSG_ERROR,
|
||
|
"WPS UPnP: setsockopt "
|
||
|
"IP_ADD_MEMBERSHIP errno %d (%s)",
|
||
|
errno, strerror(errno));
|
||
|
return -1;
|
||
|
}
|
||
|
}
|
||
|
#endif /* not needed */
|
||
|
|
||
|
/*
|
||
|
* TODO: What about IP_MULTICAST_LOOP? It seems to be on by default?
|
||
|
* which aids debugging I suppose but isn't really necessary?
|
||
|
*/
|
||
|
|
||
|
return 0;
|
||
|
}
|