Line data Source code
1 : /*
2 : * Wi-Fi Protected Setup - External Registrar (SSDP)
3 : * Copyright (c) 2009, Jouni Malinen <j@w1.fi>
4 : *
5 : * This software may be distributed under the terms of the BSD license.
6 : * See README for more details.
7 : */
8 :
9 : #include "includes.h"
10 :
11 : #include "common.h"
12 : #include "uuid.h"
13 : #include "eloop.h"
14 : #include "wps_i.h"
15 : #include "wps_upnp.h"
16 : #include "wps_upnp_i.h"
17 : #include "wps_er.h"
18 :
19 :
20 364 : static void wps_er_ssdp_rx(int sd, void *eloop_ctx, void *sock_ctx)
21 : {
22 364 : struct wps_er *er = eloop_ctx;
23 : struct sockaddr_in addr; /* client address */
24 : socklen_t addr_len;
25 : int nread;
26 : char buf[MULTICAST_MAX_READ], *pos, *pos2, *start;
27 364 : int wfa = 0, byebye = 0;
28 364 : int max_age = -1;
29 364 : char *location = NULL;
30 : u8 uuid[WPS_UUID_LEN];
31 :
32 364 : addr_len = sizeof(addr);
33 364 : nread = recvfrom(sd, buf, sizeof(buf) - 1, 0,
34 : (struct sockaddr *) &addr, &addr_len);
35 364 : if (nread <= 0)
36 227 : return;
37 364 : buf[nread] = '\0';
38 366 : if (er->filter_addr.s_addr &&
39 2 : er->filter_addr.s_addr != addr.sin_addr.s_addr)
40 2 : return;
41 :
42 362 : wpa_printf(MSG_DEBUG, "WPS ER: Received SSDP from %s",
43 : inet_ntoa(addr.sin_addr));
44 362 : wpa_hexdump_ascii(MSG_MSGDUMP, "WPS ER: Received SSDP contents",
45 : (u8 *) buf, nread);
46 :
47 362 : if (sd == er->multicast_sd) {
48 : /* Reply to M-SEARCH */
49 223 : if (os_strncmp(buf, "HTTP/1.1 200 OK", 15) != 0)
50 1 : return; /* unexpected response header */
51 : } else {
52 : /* Unsolicited message (likely NOTIFY or M-SEARCH) */
53 139 : if (os_strncmp(buf, "NOTIFY ", 7) != 0)
54 50 : return; /* only process notifications */
55 : }
56 :
57 311 : os_memset(uuid, 0, sizeof(uuid));
58 :
59 2839 : for (start = buf; start && *start; start = pos) {
60 2531 : pos = os_strchr(start, '\n');
61 2531 : if (pos) {
62 2531 : if (pos[-1] == '\r')
63 2531 : pos[-1] = '\0';
64 2531 : *pos++ = '\0';
65 : }
66 2531 : if (os_strstr(start, "schemas-wifialliance-org:device:"
67 : "WFADevice:1"))
68 168 : wfa = 1;
69 2531 : if (os_strstr(start, "schemas-wifialliance-org:service:"
70 : "WFAWLANConfig:1"))
71 134 : wfa = 1;
72 2531 : if (os_strncasecmp(start, "LOCATION:", 9) == 0) {
73 242 : start += 9;
74 692 : while (*start == ' ')
75 208 : start++;
76 242 : location = start;
77 2289 : } else if (os_strncasecmp(start, "NTS:", 4) == 0) {
78 92 : if (os_strstr(start, "ssdp:byebye"))
79 59 : byebye = 1;
80 2197 : } else if (os_strncasecmp(start, "CACHE-CONTROL:", 14) == 0) {
81 300 : start += 14;
82 300 : pos2 = os_strstr(start, "max-age=");
83 300 : if (pos2 == NULL)
84 1 : continue;
85 299 : pos2 += 8;
86 299 : max_age = atoi(pos2);
87 1897 : } else if (os_strncasecmp(start, "USN:", 4) == 0) {
88 270 : start += 4;
89 270 : pos2 = os_strstr(start, "uuid:");
90 270 : if (pos2) {
91 268 : pos2 += 5;
92 546 : while (*pos2 == ' ')
93 10 : pos2++;
94 268 : if (uuid_str2bin(pos2, uuid) < 0) {
95 3 : wpa_printf(MSG_DEBUG, "WPS ER: "
96 : "Invalid UUID in USN: %s",
97 : pos2);
98 3 : return;
99 : }
100 : }
101 : }
102 : }
103 :
104 308 : if (!wfa)
105 139 : return; /* Not WPS advertisement/reply */
106 :
107 169 : if (byebye) {
108 30 : wps_er_ap_cache_settings(er, &addr.sin_addr);
109 30 : wps_er_ap_remove(er, &addr.sin_addr);
110 30 : return;
111 : }
112 :
113 139 : if (!location)
114 1 : return; /* Unknown location */
115 :
116 138 : if (max_age < 1)
117 1 : return; /* No max-age reported */
118 :
119 137 : wpa_printf(MSG_DEBUG, "WPS ER: AP discovered: %s "
120 : "(packet source: %s max-age: %d)",
121 : location, inet_ntoa(addr.sin_addr), max_age);
122 :
123 137 : wps_er_ap_add(er, uuid, &addr.sin_addr, location, max_age);
124 : }
125 :
126 :
127 52 : void wps_er_send_ssdp_msearch(struct wps_er *er)
128 : {
129 : struct wpabuf *msg;
130 : struct sockaddr_in dest;
131 :
132 52 : msg = wpabuf_alloc(500);
133 52 : if (msg == NULL)
134 52 : return;
135 :
136 52 : wpabuf_put_str(msg,
137 : "M-SEARCH * HTTP/1.1\r\n"
138 : "HOST: 239.255.255.250:1900\r\n"
139 : "MAN: \"ssdp:discover\"\r\n"
140 : "MX: 3\r\n"
141 : "ST: urn:schemas-wifialliance-org:device:WFADevice:1"
142 : "\r\n"
143 : "\r\n");
144 :
145 52 : os_memset(&dest, 0, sizeof(dest));
146 52 : dest.sin_family = AF_INET;
147 52 : dest.sin_addr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS);
148 52 : dest.sin_port = htons(UPNP_MULTICAST_PORT);
149 :
150 52 : if (sendto(er->multicast_sd, wpabuf_head(msg), wpabuf_len(msg), 0,
151 : (struct sockaddr *) &dest, sizeof(dest)) < 0)
152 0 : wpa_printf(MSG_DEBUG, "WPS ER: M-SEARCH sendto failed: "
153 0 : "%d (%s)", errno, strerror(errno));
154 :
155 52 : wpabuf_free(msg);
156 : }
157 :
158 :
159 52 : int wps_er_ssdp_init(struct wps_er *er)
160 : {
161 52 : if (add_ssdp_network(er->ifname)) {
162 0 : wpa_printf(MSG_INFO, "WPS ER: Failed to add routing entry for "
163 : "SSDP");
164 0 : return -1;
165 : }
166 :
167 52 : er->multicast_sd = ssdp_open_multicast_sock(er->ip_addr,
168 52 : er->forced_ifname ?
169 : er->ifname : NULL);
170 52 : if (er->multicast_sd < 0) {
171 0 : wpa_printf(MSG_INFO, "WPS ER: Failed to open multicast socket "
172 : "for SSDP");
173 0 : return -1;
174 : }
175 :
176 52 : er->ssdp_sd = ssdp_listener_open();
177 52 : if (er->ssdp_sd < 0) {
178 0 : wpa_printf(MSG_INFO, "WPS ER: Failed to open SSDP listener "
179 : "socket");
180 0 : return -1;
181 : }
182 :
183 52 : if (eloop_register_sock(er->multicast_sd, EVENT_TYPE_READ,
184 51 : wps_er_ssdp_rx, er, NULL) ||
185 51 : eloop_register_sock(er->ssdp_sd, EVENT_TYPE_READ,
186 : wps_er_ssdp_rx, er, NULL))
187 1 : return -1;
188 :
189 51 : wps_er_send_ssdp_msearch(er);
190 :
191 51 : return 0;
192 : }
193 :
194 :
195 55 : void wps_er_ssdp_deinit(struct wps_er *er)
196 : {
197 55 : if (er->multicast_sd >= 0) {
198 52 : eloop_unregister_sock(er->multicast_sd, EVENT_TYPE_READ);
199 52 : close(er->multicast_sd);
200 : }
201 55 : if (er->ssdp_sd >= 0) {
202 52 : eloop_unregister_sock(er->ssdp_sd, EVENT_TYPE_READ);
203 52 : close(er->ssdp_sd);
204 : }
205 55 : }
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