1 /* 2 * Wi-Fi Protected Setup - External Registrar (SSDP) 3 * Copyright (c) 2009, Jouni Malinen <j (at) 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 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 } 125 126 127 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 } 157 158 159 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 } 193 194 195 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
