1 /* 2 * Wi-Fi Protected Setup - External Registrar (SSDP) 3 * Copyright (c) 2009, Jouni Malinen <j@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 45 wpa_printf(MSG_DEBUG, "WPS ER: Received SSDP from %s", 46 inet_ntoa(addr.sin_addr)); 47 wpa_hexdump_ascii(MSG_MSGDUMP, "WPS ER: Received SSDP contents", 48 (u8 *) buf, nread); 49 50 if (sd == er->multicast_sd) { 51 /* Reply to M-SEARCH */ 52 if (os_strncmp(buf, "HTTP/1.1 200 OK", 15) != 0) 53 return; /* unexpected response header */ 54 } else { 55 /* Unsolicited message (likely NOTIFY or M-SEARCH) */ 56 if (os_strncmp(buf, "NOTIFY ", 7) != 0) 57 return; /* only process notifications */ 58 } 59 60 os_memset(uuid, 0, sizeof(uuid)); 61 62 for (start = buf; start && *start; start = pos) { 63 pos = os_strchr(start, '\n'); 64 if (pos) { 65 if (pos[-1] == '\r') 66 pos[-1] = '\0'; 67 *pos++ = '\0'; 68 } 69 if (os_strstr(start, "schemas-wifialliance-org:device:" 70 "WFADevice:1")) 71 wfa = 1; 72 if (os_strstr(start, "schemas-wifialliance-org:service:" 73 "WFAWLANConfig:1")) 74 wfa = 1; 75 if (os_strncasecmp(start, "LOCATION:", 9) == 0) { 76 start += 9; 77 while (*start == ' ') 78 start++; 79 location = start; 80 } else if (os_strncasecmp(start, "NTS:", 4) == 0) { 81 if (os_strstr(start, "ssdp:byebye")) 82 byebye = 1; 83 } else if (os_strncasecmp(start, "CACHE-CONTROL:", 14) == 0) { 84 start += 9; 85 while (*start == ' ') 86 start++; 87 pos2 = os_strstr(start, "max-age="); 88 if (pos2 == NULL) 89 continue; 90 pos2 += 8; 91 max_age = atoi(pos2); 92 } else if (os_strncasecmp(start, "USN:", 4) == 0) { 93 start += 4; 94 pos2 = os_strstr(start, "uuid:"); 95 if (pos2) { 96 pos2 += 5; 97 while (*pos2 == ' ') 98 pos2++; 99 if (uuid_str2bin(pos2, uuid) < 0) { 100 wpa_printf(MSG_DEBUG, "WPS ER: " 101 "Invalid UUID in USN: %s", 102 pos2); 103 return; 104 } 105 } 106 } 107 } 108 109 if (!wfa) 110 return; /* Not WPS advertisement/reply */ 111 112 if (byebye) { 113 wps_er_ap_remove(er, &addr.sin_addr); 114 return; 115 } 116 117 if (!location) 118 return; /* Unknown location */ 119 120 if (max_age < 1) 121 return; /* No max-age reported */ 122 123 wpa_printf(MSG_DEBUG, "WPS ER: AP discovered: %s " 124 "(packet source: %s max-age: %d)", 125 location, inet_ntoa(addr.sin_addr), max_age); 126 127 wps_er_ap_add(er, uuid, &addr.sin_addr, location, max_age); 128 } 129 130 131 void wps_er_send_ssdp_msearch(struct wps_er *er) 132 { 133 struct wpabuf *msg; 134 struct sockaddr_in dest; 135 136 msg = wpabuf_alloc(500); 137 if (msg == NULL) 138 return; 139 140 wpabuf_put_str(msg, 141 "M-SEARCH * HTTP/1.1\r\n" 142 "HOST: 239.255.255.250:1900\r\n" 143 "MAN: \"ssdp:discover\"\r\n" 144 "MX: 3\r\n" 145 "ST: urn:schemas-wifialliance-org:device:WFADevice:1" 146 "\r\n" 147 "\r\n"); 148 149 os_memset(&dest, 0, sizeof(dest)); 150 dest.sin_family = AF_INET; 151 dest.sin_addr.s_addr = inet_addr(UPNP_MULTICAST_ADDRESS); 152 dest.sin_port = htons(UPNP_MULTICAST_PORT); 153 154 if (sendto(er->multicast_sd, wpabuf_head(msg), wpabuf_len(msg), 0, 155 (struct sockaddr *) &dest, sizeof(dest)) < 0) 156 wpa_printf(MSG_DEBUG, "WPS ER: M-SEARCH sendto failed: " 157 "%d (%s)", errno, strerror(errno)); 158 159 wpabuf_free(msg); 160 } 161 162 163 int wps_er_ssdp_init(struct wps_er *er) 164 { 165 if (add_ssdp_network(er->ifname)) 166 return -1; 167 168 er->multicast_sd = ssdp_open_multicast_sock(er->ip_addr); 169 if (er->multicast_sd < 0) 170 return -1; 171 172 er->ssdp_sd = ssdp_listener_open(); 173 if (er->ssdp_sd < 0) 174 return -1; 175 176 if (eloop_register_sock(er->multicast_sd, EVENT_TYPE_READ, 177 wps_er_ssdp_rx, er, NULL) || 178 eloop_register_sock(er->ssdp_sd, EVENT_TYPE_READ, 179 wps_er_ssdp_rx, er, NULL)) 180 return -1; 181 182 wps_er_send_ssdp_msearch(er); 183 184 return 0; 185 } 186 187 188 void wps_er_ssdp_deinit(struct wps_er *er) 189 { 190 if (er->multicast_sd >= 0) { 191 eloop_unregister_sock(er->multicast_sd, EVENT_TYPE_READ); 192 close(er->multicast_sd); 193 } 194 if (er->ssdp_sd >= 0) { 195 eloop_unregister_sock(er->ssdp_sd, EVENT_TYPE_READ); 196 close(er->ssdp_sd); 197 } 198 } 199