/* $Id: minissdp.c,v 1.77 2015/08/26 07:36:52 nanard Exp $ */ /* MiniUPnP project * http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/ * (c) 2006-2015 Thomas Bernard * This software is subject to the conditions detailed * in the LICENCE file provided within the distribution */ #include #include #include #include #include #include #include #include #include #include #include "config.h" #include "upnpdescstrings.h" #include "miniupnpdpath.h" #include "upnphttp.h" #include "upnpglobalvars.h" #include "minissdp.h" #include "upnputils.h" #include "getroute.h" #include "asyncsendto.h" #include "codelength.h" #include "macros.h" /* SSDP ip/port */ #define SSDP_PORT (1900) #define SSDP_MCAST_ADDR ("239.255.255.250") #define LL_SSDP_MCAST_ADDR "FF02::C" #define SL_SSDP_MCAST_ADDR "FF05::C" #define GL_SSDP_MCAST_ADDR "FF0E::C" /* maximum lenght of SSDP packets we are generating * (reception is done in a 1500byte buffer) */ #ifdef ENABLE_HTTPS #define SSDP_PACKET_MAX_LEN 768 #else #define SSDP_PACKET_MAX_LEN 512 #endif /* AddMulticastMembership() * param s socket * param lan_addr lan address */ static int AddMulticastMembership(int s, struct lan_addr_s * lan_addr) { #ifndef HAVE_IP_MREQN /* The ip_mreqn structure appeared in Linux 2.4. */ struct ip_mreq imr; /* Ip multicast membership */ #else /* HAVE_IP_MREQN */ struct ip_mreqn imr; /* Ip multicast membership */ #endif /* HAVE_IP_MREQN */ /* setting up imr structure */ imr.imr_multiaddr.s_addr = inet_addr(SSDP_MCAST_ADDR); /*imr.imr_interface.s_addr = htonl(INADDR_ANY);*/ #ifndef HAVE_IP_MREQN imr.imr_interface.s_addr = lan_addr->addr.s_addr; #else /* HAVE_IP_MREQN */ imr.imr_address.s_addr = lan_addr->addr.s_addr; #ifndef MULTIPLE_EXTERNAL_IP #ifdef ENABLE_IPV6 imr.imr_ifindex = lan_addr->index; #else /* ENABLE_IPV6 */ imr.imr_ifindex = if_nametoindex(lan_addr->ifname); #endif /* ENABLE_IPV6 */ #else /* MULTIPLE_EXTERNAL_IP */ imr.imr_ifindex = 0; #endif /* MULTIPLE_EXTERNAL_IP */ #endif /* HAVE_IP_MREQN */ #ifndef HAVE_IP_MREQN if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, (void *)&imr, sizeof(struct ip_mreq)) < 0) #else /* HAVE_IP_MREQN */ if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, (void *)&imr, sizeof(struct ip_mreqn)) < 0) #endif /* HAVE_IP_MREQN */ { syslog(LOG_ERR, "setsockopt(udp, IP_ADD_MEMBERSHIP): %m"); return -1; } return 0; } /* AddMulticastMembershipIPv6() * param s socket (IPv6) * param ifindex : interface index (0 : All interfaces) */ #ifdef ENABLE_IPV6 static int AddMulticastMembershipIPv6(int s, unsigned int ifindex) { struct ipv6_mreq mr; memset(&mr, 0, sizeof(mr)); mr.ipv6mr_interface = ifindex; /* 0 : all interfaces */ #ifndef IPV6_ADD_MEMBERSHIP #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP #endif inet_pton(AF_INET6, LL_SSDP_MCAST_ADDR, &mr.ipv6mr_multiaddr); if(setsockopt(s, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mr, sizeof(struct ipv6_mreq)) < 0) { syslog(LOG_ERR, "setsockopt(udp, IPV6_ADD_MEMBERSHIP): %m"); return -1; } inet_pton(AF_INET6, SL_SSDP_MCAST_ADDR, &mr.ipv6mr_multiaddr); if(setsockopt(s, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mr, sizeof(struct ipv6_mreq)) < 0) { syslog(LOG_ERR, "setsockopt(udp, IPV6_ADD_MEMBERSHIP): %m"); return -1; } inet_pton(AF_INET6, GL_SSDP_MCAST_ADDR, &mr.ipv6mr_multiaddr); if(setsockopt(s, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mr, sizeof(struct ipv6_mreq)) < 0) { syslog(LOG_ERR, "setsockopt(udp, IPV6_ADD_MEMBERSHIP): %m"); return -1; } return 0; } #endif /* Open and configure the socket listening for * SSDP udp packets sent on 239.255.255.250 port 1900 * SSDP v6 udp packets sent on FF02::C, or FF05::C, port 1900 */ int OpenAndConfSSDPReceiveSocket(int ipv6) { int s; struct sockaddr_storage sockname; socklen_t sockname_len; struct lan_addr_s * lan_addr; int j = 1; if( (s = socket(ipv6 ? PF_INET6 : PF_INET, SOCK_DGRAM, 0)) < 0) { syslog(LOG_ERR, "%s: socket(udp): %m", "OpenAndConfSSDPReceiveSocket"); return -1; } memset(&sockname, 0, sizeof(struct sockaddr_storage)); #ifdef ENABLE_IPV6 if(ipv6) { struct sockaddr_in6 * saddr = (struct sockaddr_in6 *)&sockname; saddr->sin6_family = AF_INET6; saddr->sin6_port = htons(SSDP_PORT); saddr->sin6_addr = ipv6_bind_addr; sockname_len = sizeof(struct sockaddr_in6); } else #endif /* ENABLE_IPV6 */ { struct sockaddr_in * saddr = (struct sockaddr_in *)&sockname; saddr->sin_family = AF_INET; saddr->sin_port = htons(SSDP_PORT); /* NOTE : it seems it doesnt work when binding on the specific address */ /*saddr->sin_addr.s_addr = inet_addr(UPNP_MCAST_ADDR);*/ saddr->sin_addr.s_addr = htonl(INADDR_ANY); /*saddr->sin_addr.s_addr = inet_addr(ifaddr);*/ sockname_len = sizeof(struct sockaddr_in); } if(setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &j, sizeof(j)) < 0) { syslog(LOG_WARNING, "setsockopt(udp, SO_REUSEADDR): %m"); } if(!set_non_blocking(s)) { syslog(LOG_WARNING, "%s: set_non_blocking(): %m", "OpenAndConfSSDPReceiveSocket"); } #if defined(SO_BINDTODEVICE) && !defined(MULTIPLE_EXTERNAL_IP) /* One and only one LAN interface */ if(lan_addrs.lh_first != NULL && lan_addrs.lh_first->list.le_next == NULL && strlen(lan_addrs.lh_first->ifname) > 0) { if(setsockopt(s, SOL_SOCKET, SO_BINDTODEVICE, lan_addrs.lh_first->ifname, strlen(lan_addrs.lh_first->ifname)) < 0) syslog(LOG_WARNING, "%s: setsockopt(udp%s, SO_BINDTODEVICE, %s): %m", "OpenAndConfSSDPReceiveSocket", ipv6 ? "6" : "", lan_addrs.lh_first->ifname); } #endif /* defined(SO_BINDTODEVICE) && !defined(MULTIPLE_EXTERNAL_IP) */ if(bind(s, (struct sockaddr *)&sockname, sockname_len) < 0) { syslog(LOG_ERR, "%s: bind(udp%s): %m", "OpenAndConfSSDPReceiveSocket", ipv6 ? "6" : ""); close(s); return -1; } #ifdef ENABLE_IPV6 if(ipv6) { for(lan_addr = lan_addrs.lh_first; lan_addr != NULL; lan_addr = lan_addr->list.le_next) { if(AddMulticastMembershipIPv6(s, lan_addr->index) < 0) { syslog(LOG_WARNING, "Failed to add IPv6 multicast membership for interface %s", lan_addr->str ? lan_addr->str : "NULL"); } } } else #endif { for(lan_addr = lan_addrs.lh_first; lan_addr != NULL; lan_addr = lan_addr->list.le_next) { if(AddMulticastMembership(s, lan_addr) < 0) { syslog(LOG_WARNING, "Failed to add multicast membership for interface %s", strlen(lan_addr->str) ? lan_addr->str : "NULL"); } } } return s; } /* open the UDP socket used to send SSDP notifications to * the multicast group reserved for them */ static int OpenAndConfSSDPNotifySocket(in_addr_t addr) { int s; unsigned char loopchar = 0; int bcast = 1; unsigned char ttl = 2; /* UDA v1.1 says : The TTL for the IP packet SHOULD default to 2 and SHOULD be configurable. */ /* TODO: Make TTL be configurable */ struct in_addr mc_if; struct sockaddr_in sockname; if( (s = socket(PF_INET, SOCK_DGRAM, 0)) < 0) { syslog(LOG_ERR, "socket(udp_notify): %m"); return -1; } mc_if.s_addr = addr; /*inet_addr(addr);*/ if(setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP, (char *)&loopchar, sizeof(loopchar)) < 0) { syslog(LOG_ERR, "setsockopt(udp_notify, IP_MULTICAST_LOOP): %m"); close(s); return -1; } if(setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, (char *)&mc_if, sizeof(mc_if)) < 0) { syslog(LOG_ERR, "setsockopt(udp_notify, IP_MULTICAST_IF): %m"); close(s); return -1; } if(setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0) { syslog(LOG_WARNING, "setsockopt(udp_notify, IP_MULTICAST_TTL,): %m"); } if(setsockopt(s, SOL_SOCKET, SO_BROADCAST, &bcast, sizeof(bcast)) < 0) { syslog(LOG_ERR, "setsockopt(udp_notify, SO_BROADCAST): %m"); close(s); return -1; } /* bind() socket before using sendto() is not mandatory * (sendto() will implicitly bind the socket when called on * an unbound socket) * here it is used to se a specific sending address */ memset(&sockname, 0, sizeof(struct sockaddr_in)); sockname.sin_family = AF_INET; sockname.sin_addr.s_addr = addr; /*inet_addr(addr);*/ if (bind(s, (struct sockaddr *)&sockname, sizeof(struct sockaddr_in)) < 0) { syslog(LOG_ERR, "bind(udp_notify): %m"); close(s); return -1; } return s; } #ifdef ENABLE_IPV6 /* open the UDP socket used to send SSDP notifications to * the multicast group reserved for them. IPv6 */ static int OpenAndConfSSDPNotifySocketIPv6(unsigned int if_index) { int s; unsigned int loop = 0; struct sockaddr_in6 sockname; s = socket(PF_INET6, SOCK_DGRAM, 0); if(s < 0) { syslog(LOG_ERR, "socket(udp_notify IPv6): %m"); return -1; } if(setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_IF, &if_index, sizeof(if_index)) < 0) { syslog(LOG_ERR, "setsockopt(udp_notify IPv6, IPV6_MULTICAST_IF, %u): %m", if_index); close(s); return -1; } if(setsockopt(s, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &loop, sizeof(loop)) < 0) { syslog(LOG_ERR, "setsockopt(udp_notify, IPV6_MULTICAST_LOOP): %m"); close(s); return -1; } /* bind() socket before using sendto() is not mandatory * (sendto() will implicitly bind the socket when called on * an unbound socket) * but explicit bind permits to set port/scope_id/etc. */ memset(&sockname, 0, sizeof(sockname)); sockname.sin6_family = AF_INET6; sockname.sin6_addr = in6addr_any; /*sockname.sin6_port = htons(port);*/ /*sockname.sin6_scope_id = if_index;*/ if(bind(s, (struct sockaddr *)&sockname, sizeof(sockname)) < 0) { syslog(LOG_ERR, "bind(udp_notify IPv6): %m"); close(s); return -1; } return s; } #endif int OpenAndConfSSDPNotifySockets(int * sockets) /*OpenAndConfSSDPNotifySockets(int * sockets, struct lan_addr_s * lan_addr, int n_lan_addr)*/ { int i; struct lan_addr_s * lan_addr; for(i=0, lan_addr = lan_addrs.lh_first; lan_addr != NULL; lan_addr = lan_addr->list.le_next) { sockets[i] = OpenAndConfSSDPNotifySocket(lan_addr->addr.s_addr); if(sockets[i] < 0) goto error; i++; #ifdef ENABLE_IPV6 if(GETFLAG(IPV6DISABLEDMASK)) { sockets[i] = -1; } else { sockets[i] = OpenAndConfSSDPNotifySocketIPv6(lan_addr->index); if(sockets[i] < 0) goto error; } i++; #endif } return 0; error: while(--i >= 0) { close(sockets[i]); sockets[i] = -1; } return -1; } /* * response from a LiveBox (Wanadoo) HTTP/1.1 200 OK CACHE-CONTROL: max-age=1800 DATE: Thu, 01 Jan 1970 04:03:23 GMT EXT: LOCATION: http://192.168.0.1:49152/gatedesc.xml SERVER: Linux/2.4.17, UPnP/1.0, Intel SDK for UPnP devices /1.2 ST: upnp:rootdevice USN: uuid:75802409-bccb-40e7-8e6c-fa095ecce13e::upnp:rootdevice * response from a Linksys 802.11b : HTTP/1.1 200 OK Cache-Control:max-age=120 Location:http://192.168.5.1:5678/rootDesc.xml Server:NT/5.0 UPnP/1.0 ST:upnp:rootdevice USN:uuid:upnp-InternetGatewayDevice-1_0-0090a2777777::upnp:rootdevice EXT: */ /* Responds to a SSDP "M-SEARCH" * s : socket to use * addr : peer * st, st_len : ST: header * suffix : suffix for USN: header * host, port : our HTTP host, port * delay : in milli-seconds */ static void SendSSDPResponse(int s, const struct sockaddr * addr, const char * st, int st_len, const char * suffix, const char * host, unsigned short http_port, #ifdef ENABLE_HTTPS unsigned short https_port, #endif const char * uuidvalue, unsigned int delay) { int l, n; char buf[SSDP_PACKET_MAX_LEN]; char addr_str[64]; socklen_t addrlen; int st_is_uuid; #ifdef ENABLE_HTTP_DATE char http_date[64]; time_t t; struct tm tm; time(&t); gmtime_r(&t, &tm); strftime(http_date, sizeof(http_date), "%a, %d %b %Y %H:%M:%S GMT", &tm); #endif st_is_uuid = (st_len == (int)strlen(uuidvalue)) && (memcmp(uuidvalue, st, st_len) == 0); /* * follow guideline from document "UPnP Device Architecture 1.0" * uppercase is recommended. * DATE: is recommended * SERVER: OS/ver UPnP/1.0 miniupnpd/1.0 * - check what to put in the 'Cache-Control' header * * have a look at the document "UPnP Device Architecture v1.1 */ l = snprintf(buf, sizeof(buf), "HTTP/1.1 200 OK\r\n" "CACHE-CONTROL: max-age=120\r\n" #ifdef ENABLE_HTTP_DATE "DATE: %s\r\n" #endif "ST: %.*s%s\r\n" "USN: %s%s%.*s%s\r\n" "EXT:\r\n" "SERVER: " MINIUPNPD_SERVER_STRING "\r\n" "LOCATION: http://%s:%u" ROOTDESC_PATH "\r\n" #ifdef ENABLE_HTTPS "SECURELOCATION.UPNP.ORG: https://%s:%u" ROOTDESC_PATH "\r\n" #endif "OPT: \"http://schemas.upnp.org/upnp/1/0/\"; ns=01\r\n" /* UDA v1.1 */ "01-NLS: %u\r\n" /* same as BOOTID. UDA v1.1 */ "BOOTID.UPNP.ORG: %u\r\n" /* UDA v1.1 */ "CONFIGID.UPNP.ORG: %u\r\n" /* UDA v1.1 */ "\r\n", #ifdef ENABLE_HTTP_DATE http_date, #endif st_len, st, suffix, uuidvalue, st_is_uuid ? "" : "::", st_is_uuid ? 0 : st_len, st, suffix, host, (unsigned int)http_port, #ifdef ENABLE_HTTPS host, (unsigned int)https_port, #endif upnp_bootid, upnp_bootid, upnp_configid); if(l<0) { syslog(LOG_ERR, "%s: snprintf failed %m", "SendSSDPResponse()"); return; } else if((unsigned)l>=sizeof(buf)) { syslog(LOG_WARNING, "%s: truncated output (%u>=%u)", "SendSSDPResponse()", (unsigned)l, (unsigned)sizeof(buf)); l = sizeof(buf) - 1; } addrlen = (addr->sa_family == AF_INET6) ? sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in); n = sendto_schedule(s, buf, l, 0, addr, addrlen, delay); sockaddr_to_string(addr, addr_str, sizeof(addr_str)); syslog(LOG_DEBUG, "%s: %d bytes to %s ST: %.*s", "SendSSDPResponse()", n, addr_str, l, buf); if(n < 0) { syslog(LOG_ERR, "%s: sendto(udp): %m", "SendSSDPResponse()"); } } #ifndef IGD_V2 #define IGD_VER 1 #define WANIPC_VER 1 #else #define IGD_VER 2 #define WANIPC_VER 2 #endif static struct { const char * s; const int version; const char * uuid; } const known_service_types[] = { {"upnp:rootdevice", 0, uuidvalue_igd}, {"urn:schemas-upnp-org:device:InternetGatewayDevice:", IGD_VER, uuidvalue_igd}, {"urn:schemas-upnp-org:device:WANConnectionDevice:", 1, uuidvalue_wcd}, {"urn:schemas-upnp-org:device:WANDevice:", 1, uuidvalue_wan}, {"urn:schemas-upnp-org:service:WANCommonInterfaceConfig:", 1, uuidvalue_wan}, {"urn:schemas-upnp-org:service:WANIPConnection:", WANIPC_VER, uuidvalue_wcd}, #ifndef UPNP_STRICT /* We use WAN IP Connection, not PPP connection, * but buggy control points may try to use WanPPPConnection * anyway */ {"urn:schemas-upnp-org:service:WANPPPConnection:", 1, uuidvalue_wcd}, #endif #ifdef ENABLE_L3F_SERVICE {"urn:schemas-upnp-org:service:Layer3Forwarding:", 1, uuidvalue_igd}, #endif #ifdef ENABLE_6FC_SERVICE {"urn:schemas-upnp-org:service:WANIPv6FirewallControl:", 1, uuidvalue_wcd}, #endif /* we might want to support urn:schemas-wifialliance-org:device:WFADevice:1 * urn:schemas-wifialliance-org:device:WFADevice:1 * in the future */ {0, 0, 0} }; /* SendSSDPNotify() sends the SSDP NOTIFY to a specific * destination, for a specific UPnP service or device */ static void SendSSDPNotify(int s, const struct sockaddr * dest, socklen_t dest_len, const char * dest_str, const char * host, unsigned short http_port, #ifdef ENABLE_HTTPS unsigned short https_port, #endif const char * nt, const char * suffix, const char * usn1, const char * usn2, const char * usn3, unsigned int lifetime) { char bufr[SSDP_PACKET_MAX_LEN]; int n, l; l = snprintf(bufr, sizeof(bufr), "NOTIFY * HTTP/1.1\r\n" "HOST: %s:%d\r\n" "CACHE-CONTROL: max-age=%u\r\n" "LOCATION: http://%s:%u" ROOTDESC_PATH "\r\n" #ifdef ENABLE_HTTPS "SECURELOCATION.UPNP.ORG: https://%s:%u" ROOTDESC_PATH "\r\n" #endif "SERVER: " MINIUPNPD_SERVER_STRING "\r\n" "NT: %s%s\r\n" "USN: %s%s%s%s\r\n" "NTS: ssdp:alive\r\n" "OPT: \"http://schemas.upnp.org/upnp/1/0/\"; ns=01\r\n" /* UDA v1.1 */ "01-NLS: %u\r\n" /* same as BOOTID field. UDA v1.1 */ "BOOTID.UPNP.ORG: %u\r\n" /* UDA v1.1 */ "CONFIGID.UPNP.ORG: %u\r\n" /* UDA v1.1 */ "\r\n", dest_str, SSDP_PORT, /* HOST: */ lifetime, /* CACHE-CONTROL: */ host, (unsigned int)http_port, /* LOCATION: */ #ifdef ENABLE_HTTPS host, (unsigned int)https_port, /* SECURE-LOCATION: */ #endif nt, suffix, /* NT: */ usn1, usn2, usn3, suffix, /* USN: */ upnp_bootid, /* 01-NLS: */ upnp_bootid, /* BOOTID.UPNP.ORG: */ upnp_configid ); /* CONFIGID.UPNP.ORG: */ if(l<0) { syslog(LOG_ERR, "%s: snprintf error", "SendSSDPNotify()"); return; } else if((unsigned int)l >= sizeof(bufr)) { syslog(LOG_WARNING, "%s: truncated output (%u>=%u)", "SendSSDPNotify()", (unsigned)l, (unsigned)sizeof(bufr)); l = sizeof(bufr) - 1; } n = sendto_or_schedule(s, bufr, l, 0, dest, dest_len); if(n < 0) { syslog(LOG_ERR, "sendto(udp_notify=%d, %s): %m", s, host ? host : "NULL"); } else if(n != l) { syslog(LOG_NOTICE, "sendto() sent %d out of %d bytes", n, l); } /* Due to the unreliable nature of UDP, devices SHOULD send the entire * set of discovery messages more than once with some delay between * sets e.g. a few hundred milliseconds. To avoid network congestion * discovery messages SHOULD NOT be sent more than three times. */ n = sendto_schedule(s, bufr, l, 0, dest, dest_len, 250); if(n < 0) { syslog(LOG_ERR, "sendto(udp_notify=%d, %s): %m", s, host ? host : "NULL"); } } /* SendSSDPNotifies() send SSPD NOTIFY for a specific * LAN (network interface) for all devices / services */ #ifdef ENABLE_HTTPS static void SendSSDPNotifies(int s, const char * host, unsigned short http_port, unsigned short https_port, unsigned int lifetime, int ipv6) #else static void SendSSDPNotifies(int s, const char * host, unsigned short http_port, unsigned int lifetime, int ipv6) #endif { #ifdef ENABLE_IPV6 struct sockaddr_storage sockname; static struct { const char * p1, * p2; } const mcast_addrs[] = { { LL_SSDP_MCAST_ADDR, "[" LL_SSDP_MCAST_ADDR "]" }, /* Link Local */ { SL_SSDP_MCAST_ADDR, "[" SL_SSDP_MCAST_ADDR "]" }, /* Site Local */ { GL_SSDP_MCAST_ADDR, "[" GL_SSDP_MCAST_ADDR "]" }, /* Global */ { NULL, NULL } }; int j; #else /* ENABLE_IPV6 */ struct sockaddr_in sockname; #endif /* ENABLE_IPV6 */ socklen_t sockname_len; const char * dest_str; int i; char ver_str[4]; #ifndef ENABLE_IPV6 UNUSED(ipv6); #endif /* ENABLE_IPV6 */ memset(&sockname, 0, sizeof(sockname)); #ifdef ENABLE_IPV6 /* first iterate destinations for this LAN interface (only 1 for IPv4) */ for(j = 0; (mcast_addrs[j].p1 != 0 && ipv6) || j < 1; j++) { if(ipv6) { struct sockaddr_in6 * p = (struct sockaddr_in6 *)&sockname; sockname_len = sizeof(struct sockaddr_in6); p->sin6_family = AF_INET6; p->sin6_port = htons(SSDP_PORT); inet_pton(AF_INET6, mcast_addrs[j].p1, &(p->sin6_addr)); dest_str = mcast_addrs[j].p2; /* UPnP Device Architecture 1.1 : * Devices MUST multicast SSDP messages for each of the UPnP-enabled * interfaces. The scope of multicast SSDP messages MUST be * link local FF02::C if the message is sent from a link local address. * If the message is sent from a global address it MUST be multicast * using either global scope FF0E::C or site local scope FF05::C. * In networks with complex topologies and overlapping sites, use of * global scope is RECOMMENDED. */ } else { #else /* ENABLE_IPV6 */ { #endif /* ENABLE_IPV6 */ /* IPv4 */ struct sockaddr_in *p = (struct sockaddr_in *)&sockname; sockname_len = sizeof(struct sockaddr_in); p->sin_family = AF_INET; p->sin_port = htons(SSDP_PORT); p->sin_addr.s_addr = inet_addr(SSDP_MCAST_ADDR); dest_str = SSDP_MCAST_ADDR; } /* iterate all services / devices */ for(i = 0; known_service_types[i].s; i++) { if(i==0) ver_str[0] = '\0'; else snprintf(ver_str, sizeof(ver_str), "%d", known_service_types[i].version); SendSSDPNotify(s, (struct sockaddr *)&sockname, sockname_len, dest_str, host, http_port, #ifdef ENABLE_HTTPS https_port, #endif known_service_types[i].s, ver_str, /* NT: */ known_service_types[i].uuid, "::", known_service_types[i].s, /* ver_str, USN: */ lifetime); /* for devices, also send NOTIFY on the uuid */ if(0==memcmp(known_service_types[i].s, "urn:schemas-upnp-org:device", sizeof("urn:schemas-upnp-org:device")-1)) { SendSSDPNotify(s, (struct sockaddr *)&sockname, sockname_len, dest_str, host, http_port, #ifdef ENABLE_HTTPS https_port, #endif known_service_types[i].uuid, "", /* NT: */ known_service_types[i].uuid, "", "", /* ver_str, USN: */ lifetime); } } /* for(i = 0; known_service_types[i].s; i++) */ #ifdef ENABLE_IPV6 } /* for(j = 0; (mcast_addrs[j].p1 != 0 && ipv6) || j < 1; j++) */ #endif /* ENABLE_IPV6 */ } /* SendSSDPNotifies2() sends SSDP NOTIFY packets on all interfaces * for all destinations, all devices / services */ void SendSSDPNotifies2(int * sockets, unsigned short http_port, #ifdef ENABLE_HTTPS unsigned short https_port, #endif unsigned int lifetime) { int i; struct lan_addr_s * lan_addr; for(i = 0, lan_addr = lan_addrs.lh_first; lan_addr != NULL; lan_addr = lan_addr->list.le_next) { SendSSDPNotifies(sockets[i], lan_addr->str, http_port, #ifdef ENABLE_HTTPS https_port, #endif lifetime, 0); i++; #ifdef ENABLE_IPV6 if(sockets[i] >= 0) { SendSSDPNotifies(sockets[i], ipv6_addr_for_http_with_brackets, http_port, #ifdef ENABLE_HTTPS https_port, #endif lifetime, 1); } i++; #endif /* ENABLE_IPV6 */ } } /* ProcessSSDPRequest() * process SSDP M-SEARCH requests and responds to them */ void #ifdef ENABLE_HTTPS ProcessSSDPRequest(int s, unsigned short http_port, unsigned short https_port) #else ProcessSSDPRequest(int s, unsigned short http_port) #endif { int n; char bufr[1500]; socklen_t len_r; #ifdef ENABLE_IPV6 struct sockaddr_storage sendername; len_r = sizeof(struct sockaddr_storage); #else struct sockaddr_in sendername; len_r = sizeof(struct sockaddr_in); #endif n = recvfrom(s, bufr, sizeof(bufr), 0, (struct sockaddr *)&sendername, &len_r); if(n < 0) { /* EAGAIN, EWOULDBLOCK, EINTR : silently ignore (try again next time) * other errors : log to LOG_ERR */ if(errno != EAGAIN && errno != EWOULDBLOCK && errno != EINTR) { syslog(LOG_ERR, "recvfrom(udp): %m"); } return; } #ifdef ENABLE_HTTPS ProcessSSDPData(s, bufr, n, (struct sockaddr *)&sendername, http_port, https_port); #else ProcessSSDPData(s, bufr, n, (struct sockaddr *)&sendername, http_port); #endif } #ifdef ENABLE_HTTPS void ProcessSSDPData(int s, const char *bufr, int n, const struct sockaddr * sender, unsigned short http_port, unsigned short https_port) #else void ProcessSSDPData(int s, const char *bufr, int n, const struct sockaddr * sender, unsigned short http_port) #endif { int i, l; struct lan_addr_s * lan_addr = NULL; const char * st = NULL; int st_len = 0; int st_ver = 0; char sender_str[64]; char ver_str[4]; const char * announced_host = NULL; #ifdef UPNP_STRICT #ifdef ENABLE_IPV6 char announced_host_buf[64]; #endif #endif #if defined(UPNP_STRICT) || defined(DELAY_MSEARCH_RESPONSE) int mx_value = -1; #endif unsigned int delay = 50; /* Non-zero default delay to prevent flooding */ /* UPnP Device Architecture v1.1. 1.3.3 Search response : * Devices responding to a multicast M-SEARCH SHOULD wait a random period * of time between 0 seconds and the number of seconds specified in the * MX field value of the search request before responding, in order to * avoid flooding the requesting control point with search responses * from multiple devices. If the search request results in the need for * a multiple part response from the device, those multiple part * responses SHOULD be spread at random intervals through the time period * from 0 to the number of seconds specified in the MX header field. */ /* get the string representation of the sender address */ sockaddr_to_string(sender, sender_str, sizeof(sender_str)); lan_addr = get_lan_for_peer(sender); if(lan_addr == NULL) { syslog(LOG_WARNING, "SSDP packet sender %s not from a LAN, ignoring", sender_str); return; } if(memcmp(bufr, "NOTIFY", 6) == 0) { /* ignore NOTIFY packets. We could log the sender and device type */ return; } else if(memcmp(bufr, "M-SEARCH", 8) == 0) { i = 0; while(i < n) { while((i < n - 1) && (bufr[i] != '\r' || bufr[i+1] != '\n')) i++; i += 2; if((i < n - 3) && (strncasecmp(bufr+i, "st:", 3) == 0)) { st = bufr+i+3; st_len = 0; while((*st == ' ' || *st == '\t') && (st < bufr + n)) st++; while(st[st_len]!='\r' && st[st_len]!='\n' && (st + st_len < bufr + n)) st_len++; l = st_len; while(l > 0 && st[l-1] != ':') l--; st_ver = atoi(st+l); syslog(LOG_DEBUG, "ST: %.*s (ver=%d)", st_len, st, st_ver); /*j = 0;*/ /*while(bufr[i+j]!='\r') j++;*/ /*syslog(LOG_INFO, "%.*s", j, bufr+i);*/ } #if defined(UPNP_STRICT) || defined(DELAY_MSEARCH_RESPONSE) else if((i < n - 3) && (strncasecmp(bufr+i, "mx:", 3) == 0)) { const char * mx; int mx_len; mx = bufr+i+3; mx_len = 0; while((*mx == ' ' || *mx == '\t') && (mx < bufr + n)) mx++; while(mx[mx_len]!='\r' && mx[mx_len]!='\n' && (mx + mx_len < bufr + n)) mx_len++; mx_value = atoi(mx); syslog(LOG_DEBUG, "MX: %.*s (value=%d)", mx_len, mx, mx_value); } #endif } #ifdef UPNP_STRICT /* For multicast M-SEARCH requests, if the search request does * not contain an MX header field, the device MUST silently * discard and ignore the search request. */ if(mx_value < 0) { syslog(LOG_INFO, "ignoring SSDP packet missing MX: header"); return; } else if(mx_value > 5) { /* If the MX header field specifies a field value greater * than 5, the device SHOULD assume that it contained the * value 5 or less. */ mx_value = 5; } #elif defined(DELAY_MSEARCH_RESPONSE) if(mx_value < 0) { mx_value = 1; } else if(mx_value > 5) { /* If the MX header field specifies a field value greater * than 5, the device SHOULD assume that it contained the * value 5 or less. */ mx_value = 5; } #endif /*syslog(LOG_INFO, "SSDP M-SEARCH packet received from %s", sender_str );*/ if(st && (st_len > 0)) { syslog(LOG_INFO, "SSDP M-SEARCH from %s ST: %.*s", sender_str, st_len, st); /* find in which sub network the client is */ if(sender->sa_family == AF_INET) { if (lan_addr == NULL) { syslog(LOG_ERR, "Can't find in which sub network the client %s is", sender_str); return; } announced_host = lan_addr->str; } #ifdef ENABLE_IPV6 else { /* IPv6 address with brackets */ #ifdef UPNP_STRICT int index; struct in6_addr addr6; size_t addr6_len = sizeof(addr6); /* retrieve the IPv6 address which * will be used locally to reach sender */ memset(&addr6, 0, sizeof(addr6)); if(get_src_for_route_to (sender, &addr6, &addr6_len, &index) < 0) { syslog(LOG_WARNING, "get_src_for_route_to() failed, using %s", ipv6_addr_for_http_with_brackets); announced_host = ipv6_addr_for_http_with_brackets; } else { if(inet_ntop(AF_INET6, &addr6, announced_host_buf+1, sizeof(announced_host_buf) - 2)) { announced_host_buf[0] = '['; i = strlen(announced_host_buf); if(i < (int)sizeof(announced_host_buf) - 1) { announced_host_buf[i] = ']'; announced_host_buf[i+1] = '\0'; } else { syslog(LOG_NOTICE, "cannot suffix %s with ']'", announced_host_buf); } announced_host = announced_host_buf; } else { syslog(LOG_NOTICE, "inet_ntop() failed %m"); announced_host = ipv6_addr_for_http_with_brackets; } } #else announced_host = ipv6_addr_for_http_with_brackets; #endif } #endif /* Responds to request with a device as ST header */ for(i = 0; known_service_types[i].s; i++) { l = (int)strlen(known_service_types[i].s); if(l<=st_len && (0 == memcmp(st, known_service_types[i].s, l)) #ifdef UPNP_STRICT && (st_ver <= known_service_types[i].version) /* only answer for service version lower or equal of supported one */ #endif ) { /* SSDP_RESPOND_SAME_VERSION : * response is urn:schemas-upnp-org:service:WANIPConnection:1 when * M-SEARCH included urn:schemas-upnp-org:service:WANIPConnection:1 * else the implemented versions is included in the response * * From UPnP Device Architecture v1.1 : * 1.3.2 [...] Updated versions of device and service types * are REQUIRED to be fully backward compatible with * previous versions. Devices MUST respond to M-SEARCH * requests for any supported version. For example, if a * device implements “urn:schemas-upnporg:service:xyz:2”, * it MUST respond to search requests for both that type * and “urn:schemas-upnp-org:service:xyz:1”. The response * MUST specify the same version as was contained in the * search request. [...] */ #ifndef SSDP_RESPOND_SAME_VERSION if(i==0) ver_str[0] = '\0'; else snprintf(ver_str, sizeof(ver_str), "%d", known_service_types[i].version); #endif syslog(LOG_INFO, "Single search found"); #ifdef DELAY_MSEARCH_RESPONSE delay = random() / (1 + RAND_MAX / (1000 * mx_value)); #ifdef DEBUG syslog(LOG_DEBUG, "mx=%dsec delay=%ums", mx_value, delay); #endif #endif SendSSDPResponse(s, sender, #ifdef SSDP_RESPOND_SAME_VERSION st, st_len, "", #else known_service_types[i].s, l, ver_str, #endif announced_host, http_port, #ifdef ENABLE_HTTPS https_port, #endif known_service_types[i].uuid, delay); break; } } /* Responds to request with ST: ssdp:all */ /* strlen("ssdp:all") == 8 */ if(st_len==8 && (0 == memcmp(st, "ssdp:all", 8))) { #ifdef DELAY_MSEARCH_RESPONSE unsigned int delay_increment = (mx_value * 1000) / 15; #endif syslog(LOG_INFO, "ssdp:all found"); for(i=0; known_service_types[i].s; i++) { #ifdef DELAY_MSEARCH_RESPONSE delay += delay_increment; #endif if(i==0) ver_str[0] = '\0'; else snprintf(ver_str, sizeof(ver_str), "%d", known_service_types[i].version); l = (int)strlen(known_service_types[i].s); SendSSDPResponse(s, sender, known_service_types[i].s, l, ver_str, announced_host, http_port, #ifdef ENABLE_HTTPS https_port, #endif known_service_types[i].uuid, delay); } /* also answer for uuid */ #ifdef DELAY_MSEARCH_RESPONSE delay += delay_increment; #endif SendSSDPResponse(s, sender, uuidvalue_igd, strlen(uuidvalue_igd), "", announced_host, http_port, #ifdef ENABLE_HTTPS https_port, #endif uuidvalue_igd, delay); #ifdef DELAY_MSEARCH_RESPONSE delay += delay_increment; #endif SendSSDPResponse(s, sender, uuidvalue_wan, strlen(uuidvalue_wan), "", announced_host, http_port, #ifdef ENABLE_HTTPS https_port, #endif uuidvalue_wan, delay); #ifdef DELAY_MSEARCH_RESPONSE delay += delay_increment; #endif SendSSDPResponse(s, sender, uuidvalue_wcd, strlen(uuidvalue_wcd), "", announced_host, http_port, #ifdef ENABLE_HTTPS https_port, #endif uuidvalue_wcd, delay); } /* responds to request by UUID value */ l = (int)strlen(uuidvalue_igd); if(l==st_len) { #ifdef DELAY_MSEARCH_RESPONSE delay = random() / (1 + RAND_MAX / (1000 * mx_value)); #endif if(0 == memcmp(st, uuidvalue_igd, l)) { syslog(LOG_INFO, "ssdp:uuid (IGD) found"); SendSSDPResponse(s, sender, st, st_len, "", announced_host, http_port, #ifdef ENABLE_HTTPS https_port, #endif uuidvalue_igd, delay); } else if(0 == memcmp(st, uuidvalue_wan, l)) { syslog(LOG_INFO, "ssdp:uuid (WAN) found"); SendSSDPResponse(s, sender, st, st_len, "", announced_host, http_port, #ifdef ENABLE_HTTPS https_port, #endif uuidvalue_wan, delay); } else if(0 == memcmp(st, uuidvalue_wcd, l)) { syslog(LOG_INFO, "ssdp:uuid (WCD) found"); SendSSDPResponse(s, sender, st, st_len, "", announced_host, http_port, #ifdef ENABLE_HTTPS https_port, #endif uuidvalue_wcd, delay); } } } else { syslog(LOG_INFO, "Invalid SSDP M-SEARCH from %s", sender_str); } } else { syslog(LOG_NOTICE, "Unknown udp packet received from %s", sender_str); } } static int SendSSDPbyebye(int s, const struct sockaddr * dest, socklen_t destlen, const char * dest_str, const char * nt, const char * suffix, const char * usn1, const char * usn2, const char * usn3) { int n, l; char bufr[SSDP_PACKET_MAX_LEN]; l = snprintf(bufr, sizeof(bufr), "NOTIFY * HTTP/1.1\r\n" "HOST: %s:%d\r\n" "NT: %s%s\r\n" "USN: %s%s%s%s\r\n" "NTS: ssdp:byebye\r\n" "OPT: \"http://schemas.upnp.org/upnp/1/0/\"; ns=01\r\n" /* UDA v1.1 */ "01-NLS: %u\r\n" /* same as BOOTID field. UDA v1.1 */ "BOOTID.UPNP.ORG: %u\r\n" /* UDA v1.1 */ "CONFIGID.UPNP.ORG: %u\r\n" /* UDA v1.1 */ "\r\n", dest_str, SSDP_PORT, /* HOST : */ nt, suffix, /* NT: */ usn1, usn2, usn3, suffix, /* USN: */ upnp_bootid, upnp_bootid, upnp_configid); if(l<0) { syslog(LOG_ERR, "%s: snprintf error", "SendSSDPbyebye()"); return -1; } else if((unsigned int)l >= sizeof(bufr)) { syslog(LOG_WARNING, "%s: truncated output (%u>=%u)", "SendSSDPbyebye()", (unsigned)l, (unsigned)sizeof(bufr)); l = sizeof(bufr) - 1; } n = sendto_or_schedule(s, bufr, l, 0, dest, destlen); if(n < 0) { syslog(LOG_ERR, "sendto(udp_shutdown=%d): %m", s); return -1; } else if(n != l) { syslog(LOG_NOTICE, "sendto() sent %d out of %d bytes", n, l); return -1; } return 0; } /* This will broadcast ssdp:byebye notifications to inform * the network that UPnP is going down. */ int SendSSDPGoodbye(int * sockets, int n_sockets) { struct sockaddr_in sockname4; #ifdef ENABLE_IPV6 struct sockaddr_in6 sockname6; struct sockaddr * sockname; socklen_t socknamelen; int ipv6 = 0; #endif int i, j; char ver_str[4]; int ret = 0; const char * dest_str; memset(&sockname4, 0, sizeof(struct sockaddr_in)); sockname4.sin_family = AF_INET; sockname4.sin_port = htons(SSDP_PORT); sockname4.sin_addr.s_addr = inet_addr(SSDP_MCAST_ADDR); #ifdef ENABLE_IPV6 memset(&sockname6, 0, sizeof(struct sockaddr_in6)); sockname6.sin6_family = AF_INET6; sockname6.sin6_port = htons(SSDP_PORT); inet_pton(AF_INET6, LL_SSDP_MCAST_ADDR, &(sockname6.sin6_addr)); #else dest_str = SSDP_MCAST_ADDR; #endif for(j=0; j 0) l++; CODELENGTH(l, p); memcpy(p, known_service_types[i].s, l); if(i > 0) p[l-1] = '1'; p += l; if(i==0) ver_str[0] = '\0'; else snprintf(ver_str, sizeof(ver_str), "%d", known_service_types[i].version); l = snprintf(strbuf, sizeof(strbuf), "%s::%s%s", known_service_types[i].uuid, known_service_types[i].s, ver_str); if(l<0) { syslog(LOG_WARNING, "SubmitServicesToMiniSSDPD: snprintf %m"); continue; } else if((unsigned)l>=sizeof(strbuf)) { l = sizeof(strbuf) - 1; } CODELENGTH(l, p); memcpy(p, strbuf, l); p += l; l = (int)strlen(MINIUPNPD_SERVER_STRING); CODELENGTH(l, p); memcpy(p, MINIUPNPD_SERVER_STRING, l); p += l; l = snprintf(strbuf, sizeof(strbuf), "http://%s:%u" ROOTDESC_PATH, host, (unsigned int)port); if(l<0) { syslog(LOG_WARNING, "SubmitServicesToMiniSSDPD: snprintf %m"); continue; } else if((unsigned)l>=sizeof(strbuf)) { l = sizeof(strbuf) - 1; } CODELENGTH(l, p); memcpy(p, strbuf, l); p += l; /* now write the encoded data */ n = p - buffer; /* bytes to send */ p = buffer; /* start */ while(n > 0) { l = write(s, p, n); if (l < 0) { if(errno == EINTR) continue; syslog(LOG_ERR, "write(): %m"); close(s); return -1; } else if (l == 0) { syslog(LOG_ERR, "write() returned 0"); close(s); return -1; } p += l; n -= l; } } close(s); return 0; }