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miniupnp/miniupnpd/minissdp.c

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/* $Id: minissdp.c,v 1.27 2011/05/23 12:39:41 nanard Exp $ */
/* MiniUPnP project
* http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
* (c) 2006-2011 Thomas Bernard
* This software is subject to the conditions detailed
* in the LICENCE file provided within the distribution */
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <syslog.h>
#include "config.h"
#include "upnpdescstrings.h"
#include "miniupnpdpath.h"
#include "upnphttp.h"
#include "upnpglobalvars.h"
#include "minissdp.h"
#include "upnputils.h"
#include "codelength.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")
/* AddMulticastMembership()
* param s socket
* param ifaddr ip v4 address
*/
static int
AddMulticastMembership(int s, in_addr_t ifaddr)
{
struct ip_mreq imr; /* Ip multicast membership */
/* setting up imr structure */
imr.imr_multiaddr.s_addr = inet_addr(SSDP_MCAST_ADDR);
/*imr.imr_interface.s_addr = htonl(INADDR_ANY);*/
imr.imr_interface.s_addr = ifaddr; /*inet_addr(ifaddr);*/
if (setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, (void *)&imr, sizeof(struct ip_mreq)) < 0)
{
syslog(LOG_ERR, "setsockopt(udp, IP_ADD_MEMBERSHIP): %m");
return -1;
}
return 0;
}
/* AddMulticastMembershipIPv6()
* param s socket (IPv6)
* To be improved to target specific network interfaces */
#ifdef ENABLE_IPV6
static int
AddMulticastMembershipIPv6(int s)
{
struct ipv6_mreq mr;
/*unsigned int ifindex;*/
memset(&mr, 0, sizeof(mr));
inet_pton(AF_INET6, LL_SSDP_MCAST_ADDR, &mr.ipv6mr_multiaddr);
/*mr.ipv6mr_interface = ifindex;*/
mr.ipv6mr_interface = 0; /* 0 : all interfaces */
#ifndef IPV6_ADD_MEMBERSHIP
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
#endif
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;
}
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, "socket(udp): %m");
return -1;
}
memset(&sockname, 0, sizeof(struct sockaddr_storage));
if(ipv6) {
struct sockaddr_in6 * saddr = (struct sockaddr_in6 *)&sockname;
saddr->sin6_family = AF_INET6;
saddr->sin6_port = htons(SSDP_PORT);
saddr->sin6_addr = in6addr_any;
sockname_len = sizeof(struct sockaddr_in6);
} else {
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(bind(s, (struct sockaddr *)&sockname, sockname_len) < 0)
{
syslog(LOG_ERR, "bind(udp%s): %m", ipv6 ? "6" : "");
close(s);
return -1;
}
#ifdef ENABLE_IPV6
if(ipv6)
{
AddMulticastMembershipIPv6(s);
}
else
#endif
{
for(lan_addr = lan_addrs.lh_first; lan_addr != NULL; lan_addr = lan_addr->list.le_next)
{
if(AddMulticastMembership(s, lan_addr->addr.s_addr) < 0)
{
syslog(LOG_WARNING,
"Failed to add multicast membership for interface %s",
lan_addr->str);
}
}
}
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;
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, SOL_SOCKET, SO_BROADCAST, &bcast, sizeof(bcast)) < 0)
{
syslog(LOG_ERR, "setsockopt(udp_notify, SO_BROADCAST): %m");
close(s);
return -1;
}
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;
}
int
OpenAndConfSSDPNotifySockets(int * sockets)
/*OpenAndConfSSDPNotifySockets(int * sockets,
struct lan_addr_s * lan_addr, int n_lan_addr)*/
{
int i, j;
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, i++)
{
sockets[i] = OpenAndConfSSDPNotifySocket(lan_addr->addr.s_addr);
if(sockets[i] < 0)
{
for(j=0; j<i; j++)
{
close(sockets[j]);
sockets[j] = -1;
}
return -1;
}
}
return 0;
}
/*
* 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:
*/
/* not really an SSDP "announce" as it is the response
* to a SSDP "M-SEARCH" */
static void
SendSSDPAnnounce2(int s, const struct sockaddr * addr,
const char * st, int st_len, const char * suffix,
const char * host, unsigned short port)
{
int l, n;
char buf[512];
socklen_t addrlen;
/*
* 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"
/*"DATE: ...\r\n"*/
"ST: %.*s%s\r\n"
"USN: %s::%.*s%s\r\n"
"EXT:\r\n"
"SERVER: " MINIUPNPD_SERVER_STRING "\r\n"
"LOCATION: http://%s:%u" ROOTDESC_PATH "\r\n"
"OPT: \"http://schemas.upnp.org/upnp/1/0/\";\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",
st_len, st, suffix,
uuidvalue, st_len, st, suffix,
host, (unsigned int)port,
upnp_bootid, upnp_bootid, upnp_configid);
addrlen = (addr->sa_family == AF_INET6)
? sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
n = sendto(s, buf, l, 0,
addr, addrlen);
syslog(LOG_INFO, "SSDP Announce %d bytes to %s:%d ST: %.*s",n,
inet_ntoa(((const struct sockaddr_in *)addr)->sin_addr),
ntohs(((const struct sockaddr_in *)addr)->sin_port),
l, buf);
if(n < 0)
{
syslog(LOG_ERR, "sendto(udp): %m");
}
}
static const char * const known_service_types[] =
{
"upnp:rootdevice",
"urn:schemas-upnp-org:device:InternetGatewayDevice:",
"urn:schemas-upnp-org:device:WANConnectionDevice:",
"urn:schemas-upnp-org:device:WANDevice:",
"urn:schemas-upnp-org:service:WANCommonInterfaceConfig:",
"urn:schemas-upnp-org:service:WANIPConnection:",
"urn:schemas-upnp-org:service:WANPPPConnection:",
#ifdef ENABLE_L3F_SERVICE
"urn:schemas-upnp-org:service:Layer3Forwarding:",
#endif
#ifdef ENABLE_6FC_SERVICE
"url:schemas-upnp-org:service:WANIPv6FirewallControl:",
#endif
0
};
static void
SendSSDPNotifies(int s, const char * host, unsigned short port,
unsigned int lifetime)
{
struct sockaddr_in sockname;
int l, n, i=0;
char bufr[512];
memset(&sockname, 0, sizeof(struct sockaddr_in));
sockname.sin_family = AF_INET;
sockname.sin_port = htons(SSDP_PORT);
sockname.sin_addr.s_addr = inet_addr(SSDP_MCAST_ADDR);
while(known_service_types[i])
{
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:%d" ROOTDESC_PATH"\r\n"
"SERVER: " MINIUPNPD_SERVER_STRING "\r\n"
"NT: %s%s\r\n"
"USN: %s::%s%s\r\n"
"NTS: ssdp:alive\r\n"
"OPT: \"http://schemas.upnp.org/upnp/1/0/\";\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",
SSDP_MCAST_ADDR, SSDP_PORT,
lifetime,
host, port,
known_service_types[i], (i==0?"":"1"),
uuidvalue, known_service_types[i], (i==0?"":"1"),
upnp_bootid, upnp_bootid, upnp_configid );
if(l>=sizeof(bufr))
{
syslog(LOG_WARNING, "SendSSDPNotifies(): truncated output");
l = sizeof(bufr);
}
n = sendto(s, bufr, l, 0,
(struct sockaddr *)&sockname, sizeof(struct sockaddr_in) );
if(n < 0)
{
syslog(LOG_ERR, "sendto(udp_notify=%d, %s): %m", s, host);
}
i++;
}
}
void
SendSSDPNotifies2(int * sockets,
unsigned short port,
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, i++)
{
SendSSDPNotifies(sockets[i], lan_addr->str, port, lifetime);
}
}
/* ProcessSSDPRequest()
* process SSDP M-SEARCH requests and responds to them */
void
ProcessSSDPRequest(int s, unsigned short port)
{
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)
{
syslog(LOG_ERR, "recvfrom(udp): %m");
return;
}
ProcessSSDPData(s, bufr, n, (struct sockaddr *)&sendername, port);
}
void
ProcessSSDPData(int s, const char *bufr, int n,
const struct sockaddr * sender, unsigned short port) {
int i, l;
struct lan_addr_s * lan_addr = NULL;
const char * st = NULL;
int st_len = 0;
char sender_str[64];
const char * announced_host = NULL;
/* get the string representation of the sender address */
sockaddr_to_string(sender, sender_str, sizeof(sender_str));
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++;
/*syslog(LOG_INFO, "ST: %.*s", st_len, st);*/
/*j = 0;*/
/*while(bufr[i+j]!='\r') j++;*/
/*syslog(LOG_INFO, "%.*s", j, bufr+i);*/
}
}
/*syslog(LOG_INFO, "SSDP M-SEARCH packet received from %s",
sender_str );*/
if(st && (st_len > 0))
{
/* TODO : doesnt answer at once but wait for a random time */
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)
{
for(lan_addr = lan_addrs.lh_first;
lan_addr != NULL;
lan_addr = lan_addr->list.le_next)
{
if( (((const struct sockaddr_in *)sender)->sin_addr.s_addr & lan_addr->mask.s_addr)
== (lan_addr->addr.s_addr & lan_addr->mask.s_addr))
break;
}
if (lan_addr == NULL)
{
syslog(LOG_ERR, "Can't find in which sub network the client is");
return;
}
announced_host = lan_addr->str;
}
#ifdef ENABLE_IPV6
else
{
/* IPv6 address with brackets */
announced_host = ipv6_addr_for_http_with_brackets;
}
#endif
/* Responds to request with a device as ST header */
for(i = 0; known_service_types[i]; i++)
{
l = (int)strlen(known_service_types[i]);
if(l<=st_len && (0 == memcmp(st, known_service_types[i], l)))
{
syslog(LOG_INFO, "Single search found");
SendSSDPAnnounce2(s, sender,
st, st_len, "",
announced_host, port);
break;
}
}
/* Responds to request with ST: ssdp:all */
/* strlen("ssdp:all") == 8 */
if(st_len==8 && (0 == memcmp(st, "ssdp:all", 8)))
{
syslog(LOG_INFO, "ssdp:all found");
for(i=0; known_service_types[i]; i++)
{
l = (int)strlen(known_service_types[i]);
SendSSDPAnnounce2(s, sender,
known_service_types[i], l, i==0?"":"1",
announced_host, port);
}
}
/* responds to request by UUID value */
l = (int)strlen(uuidvalue);
if(l==st_len && (0 == memcmp(st, uuidvalue, l)))
{
syslog(LOG_INFO, "ssdp:uuid found");
SendSSDPAnnounce2(s, sender, st, st_len, "",
announced_host, port);
}
}
else
{
syslog(LOG_INFO, "Invalid SSDP M-SEARCH from %s", sender_str);
}
}
else
{
syslog(LOG_NOTICE, "Unknown udp packet received from %s", sender_str);
}
}
/* 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 sockname;
int n, l;
int i, j;
char bufr[512];
memset(&sockname, 0, sizeof(struct sockaddr_in));
sockname.sin_family = AF_INET;
sockname.sin_port = htons(SSDP_PORT);
sockname.sin_addr.s_addr = inet_addr(SSDP_MCAST_ADDR);
for(j=0; j<n_sockets; j++)
{
for(i=0; known_service_types[i]; i++)
{
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\r\n"
"NTS: ssdp:byebye\r\n"
"OPT: \"http://schemas.upnp.org/upnp/1/0/\";\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",
SSDP_MCAST_ADDR, SSDP_PORT,
known_service_types[i], (i==0?"":"1"),
uuidvalue, known_service_types[i], (i==0?"":"1"),
upnp_bootid, upnp_bootid, upnp_configid);
n = sendto(sockets[j], bufr, l, 0,
(struct sockaddr *)&sockname, sizeof(struct sockaddr_in) );
if(n < 0)
{
syslog(LOG_ERR, "SendSSDPGoodbye: sendto(udp_shutdown=%d): %m",
sockets[j]);
return -1;
}
}
}
return 0;
}
/* SubmitServicesToMiniSSDPD() :
* register services offered by MiniUPnPd to a running instance of
* MiniSSDPd */
int
SubmitServicesToMiniSSDPD(const char * host, unsigned short port) {
struct sockaddr_un addr;
int s;
unsigned char buffer[2048];
char strbuf[256];
unsigned char * p;
int i, l;
s = socket(AF_UNIX, SOCK_STREAM, 0);
if(s < 0) {
syslog(LOG_ERR, "socket(unix): %m");
return -1;
}
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, minissdpdsocketpath, sizeof(addr.sun_path));
if(connect(s, (struct sockaddr *)&addr, sizeof(struct sockaddr_un)) < 0) {
syslog(LOG_ERR, "connect(\"%s\"): %m", minissdpdsocketpath);
return -1;
}
for(i = 0; known_service_types[i]; i++) {
buffer[0] = 4;
p = buffer + 1;
l = (int)strlen(known_service_types[i]);
if(i > 0)
l++;
CODELENGTH(l, p);
memcpy(p, known_service_types[i], l);
if(i > 0)
p[l-1] = '1';
p += l;
l = snprintf(strbuf, sizeof(strbuf), "%s::%s%s",
uuidvalue, known_service_types[i], (i==0)?"":"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);
CODELENGTH(l, p);
memcpy(p, strbuf, l);
p += l;
if(write(s, buffer, p - buffer) < 0) {
syslog(LOG_ERR, "write(): %m");
return -1;
}
}
close(s);
return 0;
}
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