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
wps_er_ssdp_rx(int sd,void * eloop_ctx,void * sock_ctx)20 static void wps_er_ssdp_rx(int sd, void *eloop_ctx, void *sock_ctx)
21 {
22 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 int wfa = 0, byebye = 0;
28 int max_age = -1;
29 char *location = NULL;
30 u8 uuid[WPS_UUID_LEN];
31
32 addr_len = sizeof(addr);
33 nread = recvfrom(sd, buf, sizeof(buf) - 1, 0,
34 (struct sockaddr *) &addr, &addr_len);
35 if (nread <= 0)
36 return;
37 buf[nread] = '\0';
38 if (er->filter_addr.s_addr &&
39 er->filter_addr.s_addr != addr.sin_addr.s_addr)
40 return;
41
42 wpa_printf(MSG_DEBUG, "WPS ER: Received SSDP from %s",
43 inet_ntoa(addr.sin_addr));
44 wpa_hexdump_ascii(MSG_MSGDUMP, "WPS ER: Received SSDP contents",
45 (u8 *) buf, nread);
46
47 if (sd == er->multicast_sd) {
48 /* Reply to M-SEARCH */
49 if (os_strncmp(buf, "HTTP/1.1 200 OK", 15) != 0)
50 return; /* unexpected response header */
51 } else {
52 /* Unsolicited message (likely NOTIFY or M-SEARCH) */
53 if (os_strncmp(buf, "NOTIFY ", 7) != 0)
54 return; /* only process notifications */
55 }
56
57 os_memset(uuid, 0, sizeof(uuid));
58
59 for (start = buf; start && *start; start = pos) {
60 pos = os_strchr(start, '\n');
61 if (pos) {
62 if (pos[-1] == '\r')
63 pos[-1] = '\0';
64 *pos++ = '\0';
65 }
66 if (os_strstr(start, "schemas-wifialliance-org:device:"
67 "WFADevice:1"))
68 wfa = 1;
69 if (os_strstr(start, "schemas-wifialliance-org:service:"
70 "WFAWLANConfig:1"))
71 wfa = 1;
72 if (os_strncasecmp(start, "LOCATION:", 9) == 0) {
73 start += 9;
74 while (*start == ' ')
75 start++;
76 location = start;
77 } else if (os_strncasecmp(start, "NTS:", 4) == 0) {
78 if (os_strstr(start, "ssdp:byebye"))
79 byebye = 1;
80 } else if (os_strncasecmp(start, "CACHE-CONTROL:", 14) == 0) {
81 start += 14;
82 pos2 = os_strstr(start, "max-age=");
83 if (pos2 == NULL)
84 continue;
85 pos2 += 8;
86 max_age = atoi(pos2);
87 } else if (os_strncasecmp(start, "USN:", 4) == 0) {
88 start += 4;
89 pos2 = os_strstr(start, "uuid:");
90 if (pos2) {
91 pos2 += 5;
92 while (*pos2 == ' ')
93 pos2++;
94 if (uuid_str2bin(pos2, uuid) < 0) {
95 wpa_printf(MSG_DEBUG, "WPS ER: "
96 "Invalid UUID in USN: %s",
97 pos2);
98 return;
99 }
100 }
101 }
102 }
103
104 if (!wfa)
105 return; /* Not WPS advertisement/reply */
106
107 if (byebye) {
108 wps_er_ap_cache_settings(er, &addr.sin_addr);
109 wps_er_ap_remove(er, &addr.sin_addr);
110 return;
111 }
112
113 if (!location)
114 return; /* Unknown location */
115
116 if (max_age < 1)
117 return; /* No max-age reported */
118
119 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 wps_er_ap_add(er, uuid, &addr.sin_addr, location, max_age);
124 }
125
126
wps_er_send_ssdp_msearch(struct wps_er * er)127 void wps_er_send_ssdp_msearch(struct wps_er *er)
128 {
129 struct wpabuf *msg;
130 struct sockaddr_in dest;
131
132 msg = wpabuf_alloc(500);
133 if (msg == NULL)
134 return;
135
136 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 os_memset(&dest, 0, sizeof(dest));
146 dest.sin_family = AF_INET;
147 dest.sin_addr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS);
148 dest.sin_port = htons(UPNP_MULTICAST_PORT);
149
150 if (sendto(er->multicast_sd, wpabuf_head(msg), wpabuf_len(msg), 0,
151 (struct sockaddr *) &dest, sizeof(dest)) < 0)
152 wpa_printf(MSG_DEBUG, "WPS ER: M-SEARCH sendto failed: "
153 "%d (%s)", errno, strerror(errno));
154
155 wpabuf_free(msg);
156 }
157
158
wps_er_ssdp_init(struct wps_er * er)159 int wps_er_ssdp_init(struct wps_er *er)
160 {
161 if (add_ssdp_network(er->ifname)) {
162 wpa_printf(MSG_INFO, "WPS ER: Failed to add routing entry for "
163 "SSDP");
164 return -1;
165 }
166
167 er->multicast_sd = ssdp_open_multicast_sock(er->ip_addr,
168 er->forced_ifname ?
169 er->ifname : NULL);
170 if (er->multicast_sd < 0) {
171 wpa_printf(MSG_INFO, "WPS ER: Failed to open multicast socket "
172 "for SSDP");
173 return -1;
174 }
175
176 er->ssdp_sd = ssdp_listener_open();
177 if (er->ssdp_sd < 0) {
178 wpa_printf(MSG_INFO, "WPS ER: Failed to open SSDP listener "
179 "socket");
180 return -1;
181 }
182
183 if (eloop_register_sock(er->multicast_sd, EVENT_TYPE_READ,
184 wps_er_ssdp_rx, er, NULL) ||
185 eloop_register_sock(er->ssdp_sd, EVENT_TYPE_READ,
186 wps_er_ssdp_rx, er, NULL))
187 return -1;
188
189 wps_er_send_ssdp_msearch(er);
190
191 return 0;
192 }
193
194
wps_er_ssdp_deinit(struct wps_er * er)195 void wps_er_ssdp_deinit(struct wps_er *er)
196 {
197 if (er->multicast_sd >= 0) {
198 eloop_unregister_sock(er->multicast_sd, EVENT_TYPE_READ);
199 close(er->multicast_sd);
200 }
201 if (er->ssdp_sd >= 0) {
202 eloop_unregister_sock(er->ssdp_sd, EVENT_TYPE_READ);
203 close(er->ssdp_sd);
204 }
205 }
206
