1 /* 2 * Wi-Fi Protected Setup - External Registrar (SSDP) 3 * Copyright (c) 2009, Jouni Malinen <j (at) w1.fi> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 */ 14 15 #include "includes.h" 16 17 #include "common.h" 18 #include "uuid.h" 19 #include "eloop.h" 20 #include "wps_i.h" 21 #include "wps_upnp.h" 22 #include "wps_upnp_i.h" 23 #include "wps_er.h" 24 25 26 static void wps_er_ssdp_rx(int sd, void *eloop_ctx, void *sock_ctx) 27 { 28 struct wps_er *er = eloop_ctx; 29 struct sockaddr_in addr; /* client address */ 30 socklen_t addr_len; 31 int nread; 32 char buf[MULTICAST_MAX_READ], *pos, *pos2, *start; 33 int wfa = 0, byebye = 0; 34 int max_age = -1; 35 char *location = NULL; 36 u8 uuid[WPS_UUID_LEN]; 37 38 addr_len = sizeof(addr); 39 nread = recvfrom(sd, buf, sizeof(buf) - 1, 0, 40 (struct sockaddr *) &addr, &addr_len); 41 if (nread <= 0) 42 return; 43 buf[nread] = '\0'; 44 if (er->filter_addr.s_addr && 45 er->filter_addr.s_addr != addr.sin_addr.s_addr) 46 return; 47 48 wpa_printf(MSG_DEBUG, "WPS ER: Received SSDP from %s", 49 inet_ntoa(addr.sin_addr)); 50 wpa_hexdump_ascii(MSG_MSGDUMP, "WPS ER: Received SSDP contents", 51 (u8 *) buf, nread); 52 53 if (sd == er->multicast_sd) { 54 /* Reply to M-SEARCH */ 55 if (os_strncmp(buf, "HTTP/1.1 200 OK", 15) != 0) 56 return; /* unexpected response header */ 57 } else { 58 /* Unsolicited message (likely NOTIFY or M-SEARCH) */ 59 if (os_strncmp(buf, "NOTIFY ", 7) != 0) 60 return; /* only process notifications */ 61 } 62 63 os_memset(uuid, 0, sizeof(uuid)); 64 65 for (start = buf; start && *start; start = pos) { 66 pos = os_strchr(start, '\n'); 67 if (pos) { 68 if (pos[-1] == '\r') 69 pos[-1] = '\0'; 70 *pos++ = '\0'; 71 } 72 if (os_strstr(start, "schemas-wifialliance-org:device:" 73 "WFADevice:1")) 74 wfa = 1; 75 if (os_strstr(start, "schemas-wifialliance-org:service:" 76 "WFAWLANConfig:1")) 77 wfa = 1; 78 if (os_strncasecmp(start, "LOCATION:", 9) == 0) { 79 start += 9; 80 while (*start == ' ') 81 start++; 82 location = start; 83 } else if (os_strncasecmp(start, "NTS:", 4) == 0) { 84 if (os_strstr(start, "ssdp:byebye")) 85 byebye = 1; 86 } else if (os_strncasecmp(start, "CACHE-CONTROL:", 14) == 0) { 87 start += 9; 88 while (*start == ' ') 89 start++; 90 pos2 = os_strstr(start, "max-age="); 91 if (pos2 == NULL) 92 continue; 93 pos2 += 8; 94 max_age = atoi(pos2); 95 } else if (os_strncasecmp(start, "USN:", 4) == 0) { 96 start += 4; 97 pos2 = os_strstr(start, "uuid:"); 98 if (pos2) { 99 pos2 += 5; 100 while (*pos2 == ' ') 101 pos2++; 102 if (uuid_str2bin(pos2, uuid) < 0) { 103 wpa_printf(MSG_DEBUG, "WPS ER: " 104 "Invalid UUID in USN: %s", 105 pos2); 106 return; 107 } 108 } 109 } 110 } 111 112 if (!wfa) 113 return; /* Not WPS advertisement/reply */ 114 115 if (byebye) { 116 wps_er_ap_cache_settings(er, &addr.sin_addr); 117 wps_er_ap_remove(er, &addr.sin_addr); 118 return; 119 } 120 121 if (!location) 122 return; /* Unknown location */ 123 124 if (max_age < 1) 125 return; /* No max-age reported */ 126 127 wpa_printf(MSG_DEBUG, "WPS ER: AP discovered: %s " 128 "(packet source: %s max-age: %d)", 129 location, inet_ntoa(addr.sin_addr), max_age); 130 131 wps_er_ap_add(er, uuid, &addr.sin_addr, location, max_age); 132 } 133 134 135 void wps_er_send_ssdp_msearch(struct wps_er *er) 136 { 137 struct wpabuf *msg; 138 struct sockaddr_in dest; 139 140 msg = wpabuf_alloc(500); 141 if (msg == NULL) 142 return; 143 144 wpabuf_put_str(msg, 145 "M-SEARCH * HTTP/1.1\r\n" 146 "HOST: 239.255.255.250:1900\r\n" 147 "MAN: \"ssdp:discover\"\r\n" 148 "MX: 3\r\n" 149 "ST: urn:schemas-wifialliance-org:device:WFADevice:1" 150 "\r\n" 151 "\r\n"); 152 153 os_memset(&dest, 0, sizeof(dest)); 154 dest.sin_family = AF_INET; 155 dest.sin_addr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS); 156 dest.sin_port = htons(UPNP_MULTICAST_PORT); 157 158 if (sendto(er->multicast_sd, wpabuf_head(msg), wpabuf_len(msg), 0, 159 (struct sockaddr *) &dest, sizeof(dest)) < 0) 160 wpa_printf(MSG_DEBUG, "WPS ER: M-SEARCH sendto failed: " 161 "%d (%s)", errno, strerror(errno)); 162 163 wpabuf_free(msg); 164 } 165 166 167 int wps_er_ssdp_init(struct wps_er *er) 168 { 169 if (add_ssdp_network(er->ifname)) { 170 wpa_printf(MSG_INFO, "WPS ER: Failed to add routing entry for " 171 "SSDP"); 172 return -1; 173 } 174 175 er->multicast_sd = ssdp_open_multicast_sock(er->ip_addr); 176 if (er->multicast_sd < 0) { 177 wpa_printf(MSG_INFO, "WPS ER: Failed to open multicast socket " 178 "for SSDP"); 179 return -1; 180 } 181 182 er->ssdp_sd = ssdp_listener_open(); 183 if (er->ssdp_sd < 0) { 184 wpa_printf(MSG_INFO, "WPS ER: Failed to open SSDP listener " 185 "socket"); 186 return -1; 187 } 188 189 if (eloop_register_sock(er->multicast_sd, EVENT_TYPE_READ, 190 wps_er_ssdp_rx, er, NULL) || 191 eloop_register_sock(er->ssdp_sd, EVENT_TYPE_READ, 192 wps_er_ssdp_rx, er, NULL)) 193 return -1; 194 195 wps_er_send_ssdp_msearch(er); 196 197 return 0; 198 } 199 200 201 void wps_er_ssdp_deinit(struct wps_er *er) 202 { 203 if (er->multicast_sd >= 0) { 204 eloop_unregister_sock(er->multicast_sd, EVENT_TYPE_READ); 205 close(er->multicast_sd); 206 } 207 if (er->ssdp_sd >= 0) { 208 eloop_unregister_sock(er->ssdp_sd, EVENT_TYPE_READ); 209 close(er->ssdp_sd); 210 } 211 } 212
