/*
* UPnP SSDP for WPS
* Copyright (c) 2000-2003 Intel Corporation
* Copyright (c) 2006-2007 Sony Corporation
* Copyright (c) 2008-2009 Atheros Communications
* Copyright (c) 2009-2013, 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>
#ifdef __linux__
#include <net/if.h>
#endif /* __linux__ */
#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 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;
}
/***************************************************************************
* 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 upnp_wps_device_sm *sm,
struct advertisement_state_machine *a, int *islast)
{
struct wpabuf *msg;
char *NTString = "";
char uuid_string[80];
struct upnp_wps_device_interface *iface;
*islast = 0;
iface = dl_list_first(&sm->interfaces,
struct upnp_wps_device_interface, list);
if (!iface)
return NULL;
uuid_bin2str(iface->wps->uuid, uuid_string, sizeof(uuid_string));
msg = wpabuf_alloc(800); /* more than big enough */
if (msg == NULL)
return NULL;
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",
sm->ip_addr_text, 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;
}
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()
* @send_byebye: Send byebye advertisement messages immediately
*/
void advertisement_state_machine_stop(struct upnp_wps_device_sm *sm,
int send_byebye)
{
struct advertisement_state_machine *a = &sm->advertisement;
int islast = 0;
struct wpabuf *msg;
struct sockaddr_in dest;
eloop_cancel_timeout(advertisement_state_machine_handler, NULL, sm);
if (!send_byebye || sm->multicast_sd < 0)
return;
a->type = ADVERTISE_DOWN;
a->state = 0;
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);
while (!islast) {
msg = next_advertisement(sm, a, &islast);
if (msg == NULL)
break;
if (sendto(sm->multicast_sd, wpabuf_head(msg), wpabuf_len(msg),
0, (struct sockaddr *) &dest, sizeof(dest)) < 0) {
wpa_printf(MSG_INFO, "WPS UPnP: Advertisement sendto "
"failed: %d (%s)", errno, strerror(errno));
}
wpabuf_free(msg);
a->state++;
}
}
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(sm, 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;
if (os_get_random((void *) &r, sizeof(r)) < 0)
r = 32768;
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, 0);
/*
* Start out advertising down, this automatically switches
* to advertising up which signals our restart.
*/
a->type = ADVERTISE_DOWN;
a->state = 0;
/* (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.
**************************************************************************/
/**
* 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)
{
wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH stop");
dl_list_del(&a->list);
os_free(a);
}
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 = eloop_data;
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(sm, 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;
int replies;
replies = dl_list_len(&sm->msearch_replies);
wpa_printf(MSG_DEBUG, "WPS UPnP: M-SEARCH reply start (%d "
"outstanding)", replies);
if (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;
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 */
dl_list_add(&sm->msearch_replies, &a->list);
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)
{
#ifndef CONFIG_NO_STDOUT_DEBUG
const char *start = data;
#endif /* CONFIG_NO_STDOUT_DEBUG */
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)) {
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];
struct upnp_wps_device_interface *iface;
iface = dl_list_first(
&sm->interfaces,
struct upnp_wps_device_interface,
list);
if (!iface)
continue;
data += os_strlen("uuid:");
uuid_bin2str(iface->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 listener 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 */
}
int ssdp_listener_open(void)
{
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;
int sd;
sd = socket(AF_INET, SOCK_DGRAM, 0);
if (sd < 0 ||
fcntl(sd, F_SETFL, O_NONBLOCK) != 0 ||
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)) ||
setsockopt(sd, IPPROTO_IP, IP_MULTICAST_TTL,
&ttl, sizeof(ttl)))
goto fail;
return sd;
fail:
if (sd >= 0)
close(sd);
return -1;
}
/**
* 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 listener is stopped by calling ssdp_listener_stop().
*/
int ssdp_listener_start(struct upnp_wps_device_sm *sm)
{
sm->ssdp_sd = ssdp_listener_open();
if (eloop_register_sock(sm->ssdp_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(const char *net_if)
{
#ifdef __linux__
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 = (char *) net_if;
sin = aliasing_hide_typecast(&rt.rt_dst, struct sockaddr_in);
sin->sin_family = AF_INET;
sin->sin_port = 0;
sin->sin_addr.s_addr = inet_addr(SSDP_TARGET);
sin = aliasing_hide_typecast(&rt.rt_genmask, struct sockaddr_in);
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;
#else /* __linux__ */
return 0;
#endif /* __linux__ */
}
int ssdp_open_multicast_sock(u32 ip_addr, const char *forced_ifname)
{
int sd;
/* per UPnP-arch-DeviceArchitecture, 1. Discovery, keep IP packet
* time to live (TTL) small */
unsigned char ttl = 4;
sd = socket(AF_INET, SOCK_DGRAM, 0);
if (sd < 0)
return -1;
if (forced_ifname) {
#ifdef __linux__
struct ifreq req;
os_memset(&req, 0, sizeof(req));
os_strlcpy(req.ifr_name, forced_ifname, sizeof(req.ifr_name));
if (setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, &req,
sizeof(req)) < 0) {
wpa_printf(MSG_INFO, "WPS UPnP: Failed to bind "
"multicast socket to ifname %s: %s",
forced_ifname, strerror(errno));
close(sd);
return -1;
}
#endif /* __linux__ */
}
#if 0 /* maybe ok if we sometimes block on writes */
if (fcntl(sd, F_SETFL, O_NONBLOCK) != 0) {
close(sd);
return -1;
}
#endif
if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_IF,
&ip_addr, sizeof(ip_addr))) {
wpa_printf(MSG_DEBUG, "WPS: setsockopt(IP_MULTICAST_IF) %x: "
"%d (%s)", ip_addr, errno, strerror(errno));
close(sd);
return -1;
}
if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_TTL,
&ttl, sizeof(ttl))) {
wpa_printf(MSG_DEBUG, "WPS: setsockopt(IP_MULTICAST_TTL): "
"%d (%s)", errno, strerror(errno));
close(sd);
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 = 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));
close(sd);
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 sd;
}
/**
* 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)
{
sm->multicast_sd = ssdp_open_multicast_sock(sm->ip_addr, NULL);
if (sm->multicast_sd < 0)
return -1;
return 0;
}