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/*
* Wi-Fi Protected Setup - External Registrar (SSDP)
* Copyright (c) 2009, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include "common.h"
#include "uuid.h"
#include "eloop.h"
#include "wps_i.h"
#include "wps_upnp.h"
#include "wps_upnp_i.h"
#include "wps_er.h"
static void wps_er_ssdp_rx(int sd, void *eloop_ctx, void *sock_ctx)
{
struct wps_er *er = eloop_ctx;
struct sockaddr_in addr; /* client address */
socklen_t addr_len;
int nread;
char buf[MULTICAST_MAX_READ], *pos, *pos2, *start;
int wfa = 0, byebye = 0;
int max_age = -1;
char *location = NULL;
u8 uuid[WPS_UUID_LEN];
addr_len = sizeof(addr);
nread = recvfrom(sd, buf, sizeof(buf) - 1, 0,
(struct sockaddr *) &addr, &addr_len);
if (nread <= 0)
return;
buf[nread] = '\0';
if (er->filter_addr.s_addr &&
er->filter_addr.s_addr != addr.sin_addr.s_addr)
return;
wpa_printf(MSG_DEBUG, "WPS ER: Received SSDP from %s",
inet_ntoa(addr.sin_addr));
wpa_hexdump_ascii(MSG_MSGDUMP, "WPS ER: Received SSDP contents",
(u8 *) buf, nread);
if (sd == er->multicast_sd) {
/* Reply to M-SEARCH */
if (os_strncmp(buf, "HTTP/1.1 200 OK", 15) != 0)
return; /* unexpected response header */
} else {
/* Unsolicited message (likely NOTIFY or M-SEARCH) */
if (os_strncmp(buf, "NOTIFY ", 7) != 0)
return; /* only process notifications */
}
os_memset(uuid, 0, sizeof(uuid));
for (start = buf; start && *start; start = pos) {
pos = os_strchr(start, '\n');
if (pos) {
if (pos[-1] == '\r')
pos[-1] = '\0';
*pos++ = '\0';
}
if (os_strstr(start, "schemas-wifialliance-org:device:"
"WFADevice:1"))
wfa = 1;
if (os_strstr(start, "schemas-wifialliance-org:service:"
"WFAWLANConfig:1"))
wfa = 1;
if (os_strncasecmp(start, "LOCATION:", 9) == 0) {
start += 9;
while (*start == ' ')
start++;
location = start;
} else if (os_strncasecmp(start, "NTS:", 4) == 0) {
if (os_strstr(start, "ssdp:byebye"))
byebye = 1;
} else if (os_strncasecmp(start, "CACHE-CONTROL:", 14) == 0) {
start += 9;
while (*start == ' ')
start++;
pos2 = os_strstr(start, "max-age=");
if (pos2 == NULL)
continue;
pos2 += 8;
max_age = atoi(pos2);
} else if (os_strncasecmp(start, "USN:", 4) == 0) {
start += 4;
pos2 = os_strstr(start, "uuid:");
if (pos2) {
pos2 += 5;
while (*pos2 == ' ')
pos2++;
if (uuid_str2bin(pos2, uuid) < 0) {
wpa_printf(MSG_DEBUG, "WPS ER: "
"Invalid UUID in USN: %s",
pos2);
return;
}
}
}
}
if (!wfa)
return; /* Not WPS advertisement/reply */
if (byebye) {
wps_er_ap_cache_settings(er, &addr.sin_addr);
wps_er_ap_remove(er, &addr.sin_addr);
return;
}
if (!location)
return; /* Unknown location */
if (max_age < 1)
return; /* No max-age reported */
wpa_printf(MSG_DEBUG, "WPS ER: AP discovered: %s "
"(packet source: %s max-age: %d)",
location, inet_ntoa(addr.sin_addr), max_age);
wps_er_ap_add(er, uuid, &addr.sin_addr, location, max_age);
}
void wps_er_send_ssdp_msearch(struct wps_er *er)
{
struct wpabuf *msg;
struct sockaddr_in dest;
msg = wpabuf_alloc(500);
if (msg == NULL)
return;
wpabuf_put_str(msg,
"M-SEARCH * HTTP/1.1\r\n"
"HOST: 239.255.255.250:1900\r\n"
"MAN: \"ssdp:discover\"\r\n"
"MX: 3\r\n"
"ST: urn:schemas-wifialliance-org:device:WFADevice:1"
"\r\n"
"\r\n");
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(er->multicast_sd, wpabuf_head(msg), wpabuf_len(msg), 0,
(struct sockaddr *) &dest, sizeof(dest)) < 0)
wpa_printf(MSG_DEBUG, "WPS ER: M-SEARCH sendto failed: "
"%d (%s)", errno, strerror(errno));
wpabuf_free(msg);
}
int wps_er_ssdp_init(struct wps_er *er)
{
if (add_ssdp_network(er->ifname)) {
wpa_printf(MSG_INFO, "WPS ER: Failed to add routing entry for "
"SSDP");
return -1;
}
er->multicast_sd = ssdp_open_multicast_sock(er->ip_addr);
if (er->multicast_sd < 0) {
wpa_printf(MSG_INFO, "WPS ER: Failed to open multicast socket "
"for SSDP");
return -1;
}
er->ssdp_sd = ssdp_listener_open();
if (er->ssdp_sd < 0) {
wpa_printf(MSG_INFO, "WPS ER: Failed to open SSDP listener "
"socket");
return -1;
}
if (eloop_register_sock(er->multicast_sd, EVENT_TYPE_READ,
wps_er_ssdp_rx, er, NULL) ||
eloop_register_sock(er->ssdp_sd, EVENT_TYPE_READ,
wps_er_ssdp_rx, er, NULL))
return -1;
wps_er_send_ssdp_msearch(er);
return 0;
}
void wps_er_ssdp_deinit(struct wps_er *er)
{
if (er->multicast_sd >= 0) {
eloop_unregister_sock(er->multicast_sd, EVENT_TYPE_READ);
close(er->multicast_sd);
}
if (er->ssdp_sd >= 0) {
eloop_unregister_sock(er->ssdp_sd, EVENT_TYPE_READ);
close(er->ssdp_sd);
}
}
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