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/* $Id: miniupnpc.c,v 1.159 2021/03/02 23:36:32 nanard Exp $ */
/* vim: tabstop=4 shiftwidth=4 noexpandtab
* Project : miniupnp
* Web : http://miniupnp.free.fr/ or https://miniupnp.tuxfamily.org/
* Author : Thomas BERNARD
* copyright (c) 2005-2021 Thomas Bernard
* This software is subjet to the conditions detailed in the
* provided LICENSE file. */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef _WIN32
/* Win32 Specific includes and defines */
#include <winsock2.h>
#include <ws2tcpip.h>
#include <io.h>
#include <iphlpapi.h>
#include "win32_snprintf.h"
#define strdup _strdup
#ifndef strncasecmp
#if defined(_MSC_VER) && (_MSC_VER >= 1400)
#define strncasecmp _memicmp
#else /* defined(_MSC_VER) && (_MSC_VER >= 1400) */
#define strncasecmp memicmp
#endif /* defined(_MSC_VER) && (_MSC_VER >= 1400) */
#endif /* #ifndef strncasecmp */
#define MAXHOSTNAMELEN 64
#else /* #ifdef _WIN32 */
/* Standard POSIX includes */
#include <unistd.h>
#if defined(__amigaos__) && !defined(__amigaos4__)
/* Amiga OS 3 specific stuff */
#define socklen_t int
#else
#include <sys/select.h>
#endif
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <net/if.h>
#if !defined(__amigaos__) && !defined(__amigaos4__)
#include <poll.h>
#endif
#include <strings.h>
#include <errno.h>
#define closesocket close
#endif /* #else _WIN32 */
#ifdef __GNU__
#define MAXHOSTNAMELEN 64
#endif
#include "miniupnpc.h"
#include "minissdpc.h"
#include "miniwget.h"
#include "miniwget_private.h"
#include "minisoap.h"
#include "minixml.h"
#include "upnpcommands.h"
#include "connecthostport.h"
#include "addr_is_reserved.h"
/* compare the beginning of a string with a constant string */
#define COMPARE(str, cstr) (0==strncmp(str, cstr, sizeof(cstr) - 1))
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64
#endif
#define SOAPPREFIX "s"
#define SERVICEPREFIX "u"
#define SERVICEPREFIX2 'u'
/* root description parsing */
MINIUPNP_LIBSPEC void parserootdesc(const char * buffer, int bufsize, struct IGDdatas * data)
{
struct xmlparser parser;
/* xmlparser object */
parser.xmlstart = buffer;
parser.xmlsize = bufsize;
parser.data = data;
parser.starteltfunc = IGDstartelt;
parser.endeltfunc = IGDendelt;
parser.datafunc = IGDdata;
parser.attfunc = 0;
parsexml(&parser);
#ifdef DEBUG
printIGD(data);
#endif
}
/* simpleUPnPcommand2 :
* not so simple !
* return values :
* pointer - OK
* NULL - error */
static char *
simpleUPnPcommand2(SOCKET s, const char * url, const char * service,
const char * action, struct UPNParg * args,
int * bufsize, const char * httpversion)
{
char hostname[MAXHOSTNAMELEN+1];
unsigned short port = 0;
char * path;
char soapact[128];
char soapbody[2048];
int soapbodylen;
char * buf;
int n;
int status_code;
*bufsize = 0;
snprintf(soapact, sizeof(soapact), "%s#%s", service, action);
if(args==NULL)
{
soapbodylen = snprintf(soapbody, sizeof(soapbody),
"<?xml version=\"1.0\"?>\r\n"
"<" SOAPPREFIX ":Envelope "
"xmlns:" SOAPPREFIX "=\"http://schemas.xmlsoap.org/soap/envelope/\" "
SOAPPREFIX ":encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">"
"<" SOAPPREFIX ":Body>"
"<" SERVICEPREFIX ":%s xmlns:" SERVICEPREFIX "=\"%s\">"
"</" SERVICEPREFIX ":%s>"
"</" SOAPPREFIX ":Body></" SOAPPREFIX ":Envelope>"
"\r\n", action, service, action);
if ((unsigned int)soapbodylen >= sizeof(soapbody))
return NULL;
}
else
{
char * p;
const char * pe, * pv;
const char * const pend = soapbody + sizeof(soapbody);
soapbodylen = snprintf(soapbody, sizeof(soapbody),
"<?xml version=\"1.0\"?>\r\n"
"<" SOAPPREFIX ":Envelope "
"xmlns:" SOAPPREFIX "=\"http://schemas.xmlsoap.org/soap/envelope/\" "
SOAPPREFIX ":encodingStyle=\"http://schemas.xmlsoap.org/soap/encoding/\">"
"<" SOAPPREFIX ":Body>"
"<" SERVICEPREFIX ":%s xmlns:" SERVICEPREFIX "=\"%s\">",
action, service);
if ((unsigned int)soapbodylen >= sizeof(soapbody))
return NULL;
p = soapbody + soapbodylen;
while(args->elt)
{
if(p >= pend) /* check for space to write next byte */
return NULL;
*(p++) = '<';
pe = args->elt;
while(p < pend && *pe)
*(p++) = *(pe++);
if(p >= pend) /* check for space to write next byte */
return NULL;
*(p++) = '>';
if((pv = args->val))
{
while(p < pend && *pv)
*(p++) = *(pv++);
}
if((p+2) > pend) /* check for space to write next 2 bytes */
return NULL;
*(p++) = '<';
*(p++) = '/';
pe = args->elt;
while(p < pend && *pe)
*(p++) = *(pe++);
if(p >= pend) /* check for space to write next byte */
return NULL;
*(p++) = '>';
args++;
}
if((p+4) > pend) /* check for space to write next 4 bytes */
return NULL;
*(p++) = '<';
*(p++) = '/';
*(p++) = SERVICEPREFIX2;
*(p++) = ':';
pe = action;
while(p < pend && *pe)
*(p++) = *(pe++);
strncpy(p, "></" SOAPPREFIX ":Body></" SOAPPREFIX ":Envelope>\r\n",
pend - p);
if(soapbody[sizeof(soapbody)-1]) /* strncpy pads buffer with 0s, so if it doesn't end in 0, could not fit full string */
return NULL;
}
if(!parseURL(url, hostname, &port, &path, NULL)) return NULL;
if(ISINVALID(s)) {
s = connecthostport(hostname, port, 0);
if(ISINVALID(s)) {
/* failed to connect */
return NULL;
}
}
n = soapPostSubmit(s, path, hostname, port, soapact, soapbody, httpversion);
if(n<=0) {
#ifdef DEBUG
printf("Error sending SOAP request\n");
#endif
closesocket(s);
return NULL;
}
buf = getHTTPResponse(s, bufsize, &status_code);
#ifdef DEBUG
if(*bufsize > 0 && buf)
{
printf("HTTP %d SOAP Response :\n%.*s\n", status_code, *bufsize, buf);
}
else
{
printf("HTTP %d, empty SOAP response. size=%d\n", status_code, *bufsize);
}
#endif
closesocket(s);
return buf;
}
/* simpleUPnPcommand :
* not so simple !
* return values :
* pointer - OK
* NULL - error */
char *
simpleUPnPcommand(int s, const char * url, const char * service,
const char * action, struct UPNParg * args,
int * bufsize)
{
char * buf;
#if 1
buf = simpleUPnPcommand2((SOCKET)s, url, service, action, args, bufsize, "1.1");
#else
buf = simpleUPnPcommand2((SOCKET)s, url, service, action, args, bufsize, "1.0");
if (!buf || *bufsize == 0)
{
#if DEBUG
printf("Error or no result from SOAP request; retrying with HTTP/1.1\n");
#endif
buf = simpleUPnPcommand2((SOCKET)s, url, service, action, args, bufsize, "1.1");
}
#endif
return buf;
}
/* upnpDiscoverDevices() :
* return a chained list of all devices found or NULL if
* no devices was found.
* It is up to the caller to free the chained list
* delay is in millisecond (poll).
* UDA v1.1 says :
* The TTL for the IP packet SHOULD default to 2 and
* SHOULD be configurable. */
MINIUPNP_LIBSPEC struct UPNPDev *
upnpDiscoverDevices(const char * const deviceTypes[],
int delay, const char * multicastif,
const char * minissdpdsock, int localport,
int ipv6, unsigned char ttl,
int * error,
int searchalltypes)
{
struct UPNPDev * tmp;
struct UPNPDev * devlist = 0;
#if !defined(_WIN32) && !defined(__amigaos__) && !defined(__amigaos4__)
int deviceIndex;
#endif /* !defined(_WIN32) && !defined(__amigaos__) && !defined(__amigaos4__) */
if(error)
*error = UPNPDISCOVER_UNKNOWN_ERROR;
#if !defined(_WIN32) && !defined(__amigaos__) && !defined(__amigaos4__)
/* first try to get infos from minissdpd ! */
if(!minissdpdsock)
minissdpdsock = "/var/run/minissdpd.sock";
if(minissdpdsock[0] != '\0') {
for(deviceIndex = 0; deviceTypes[deviceIndex]; deviceIndex++) {
struct UPNPDev * minissdpd_devlist;
int only_rootdevice = 1;
minissdpd_devlist = getDevicesFromMiniSSDPD(deviceTypes[deviceIndex],
minissdpdsock, 0);
if(minissdpd_devlist) {
#ifdef DEBUG
printf("returned by MiniSSDPD: %s\t%s\n",
minissdpd_devlist->st, minissdpd_devlist->descURL);
#endif /* DEBUG */
if(!strstr(minissdpd_devlist->st, "rootdevice"))
only_rootdevice = 0;
for(tmp = minissdpd_devlist; tmp->pNext != NULL; tmp = tmp->pNext) {
#ifdef DEBUG
printf("returned by MiniSSDPD: %s\t%s\n",
tmp->pNext->st, tmp->pNext->descURL);
#endif /* DEBUG */
if(!strstr(tmp->st, "rootdevice"))
only_rootdevice = 0;
}
tmp->pNext = devlist;
devlist = minissdpd_devlist;
if(!searchalltypes && !only_rootdevice)
break;
}
}
}
for(tmp = devlist; tmp != NULL; tmp = tmp->pNext) {
/* We return what we have found if it was not only a rootdevice */
if(!strstr(tmp->st, "rootdevice")) {
if(error)
*error = UPNPDISCOVER_SUCCESS;
return devlist;
}
}
#else /* !defined(_WIN32) && !defined(__amigaos__) && !defined(__amigaos4__) */
(void)minissdpdsock; /* unused */
#endif /* !defined(_WIN32) && !defined(__amigaos__) && !defined(__amigaos4__) */
/* direct discovery if minissdpd responses are not sufficient */
{
struct UPNPDev * discovered_devlist;
discovered_devlist = ssdpDiscoverDevices(deviceTypes, delay, multicastif, localport,
ipv6, ttl, error, searchalltypes);
if(devlist == NULL)
devlist = discovered_devlist;
else {
for(tmp = devlist; tmp->pNext != NULL; tmp = tmp->pNext);
tmp->pNext = discovered_devlist;
}
}
return devlist;
}
/* upnpDiscover() Discover IGD device */
MINIUPNP_LIBSPEC struct UPNPDev *
upnpDiscover(int delay, const char * multicastif,
const char * minissdpdsock, int localport,
int ipv6, unsigned char ttl,
int * error)
{
static const char * const deviceList[] = {
#if 0
"urn:schemas-upnp-org:device:InternetGatewayDevice:2",
"urn:schemas-upnp-org:service:WANIPConnection:2",
#endif
"urn:schemas-upnp-org:device:InternetGatewayDevice:1",
"urn:schemas-upnp-org:service:WANIPConnection:1",
"urn:schemas-upnp-org:service:WANPPPConnection:1",
"upnp:rootdevice",
/*"ssdp:all",*/
0
};
return upnpDiscoverDevices(deviceList,
delay, multicastif, minissdpdsock, localport,
ipv6, ttl, error, 0);
}
/* upnpDiscoverAll() Discover all UPnP devices */
MINIUPNP_LIBSPEC struct UPNPDev *
upnpDiscoverAll(int delay, const char * multicastif,
const char * minissdpdsock, int localport,
int ipv6, unsigned char ttl,
int * error)
{
static const char * const deviceList[] = {
/*"upnp:rootdevice",*/
"ssdp:all",
0
};
return upnpDiscoverDevices(deviceList,
delay, multicastif, minissdpdsock, localport,
ipv6, ttl, error, 0);
}
/* upnpDiscoverDevice() Discover a specific device */
MINIUPNP_LIBSPEC struct UPNPDev *
upnpDiscoverDevice(const char * device, int delay, const char * multicastif,
const char * minissdpdsock, int localport,
int ipv6, unsigned char ttl,
int * error)
{
const char * const deviceList[] = {
device,
0
};
return upnpDiscoverDevices(deviceList,
delay, multicastif, minissdpdsock, localport,
ipv6, ttl, error, 0);
}
static char *
build_absolute_url(const char * baseurl, const char * descURL,
const char * url, unsigned int scope_id)
{
size_t l, n;
char * s;
const char * base;
char * p;
#if defined(IF_NAMESIZE) && !defined(_WIN32)
char ifname[IF_NAMESIZE];
#else /* defined(IF_NAMESIZE) && !defined(_WIN32) */
char scope_str[8];
#endif /* defined(IF_NAMESIZE) && !defined(_WIN32) */
if( (url[0] == 'h')
&&(url[1] == 't')
&&(url[2] == 't')
&&(url[3] == 'p')
&&(url[4] == ':')
&&(url[5] == '/')
&&(url[6] == '/'))
return strdup(url);
base = (baseurl[0] == '\0') ? descURL : baseurl;
n = strlen(base);
if(n > 7) {
p = strchr(base + 7, '/');
if(p)
n = p - base;
}
l = n + strlen(url) + 1;
if(url[0] != '/')
l++;
if(scope_id != 0) {
#if defined(IF_NAMESIZE) && !defined(_WIN32)
if(if_indextoname(scope_id, ifname)) {
l += 3 + strlen(ifname); /* 3 == strlen(%25) */
}
#else /* defined(IF_NAMESIZE) && !defined(_WIN32) */
/* under windows, scope is numerical */
l += 3 + snprintf(scope_str, sizeof(scope_str), "%u", scope_id);
#endif /* defined(IF_NAMESIZE) && !defined(_WIN32) */
}
s = malloc(l);
if(s == NULL) return NULL;
memcpy(s, base, n);
if(scope_id != 0) {
s[n] = '\0';
if(n > 13 && 0 == memcmp(s, "http://[fe80:", 13)) {
/* this is a linklocal IPv6 address */
p = strchr(s, ']');
if(p) {
/* insert %25<scope> into URL */
#if defined(IF_NAMESIZE) && !defined(_WIN32)
memmove(p + 3 + strlen(ifname), p, strlen(p) + 1);
memcpy(p, "%25", 3);
memcpy(p + 3, ifname, strlen(ifname));
n += 3 + strlen(ifname);
#else /* defined(IF_NAMESIZE) && !defined(_WIN32) */
memmove(p + 3 + strlen(scope_str), p, strlen(p) + 1);
memcpy(p, "%25", 3);
memcpy(p + 3, scope_str, strlen(scope_str));
n += 3 + strlen(scope_str);
#endif /* defined(IF_NAMESIZE) && !defined(_WIN32) */
}
}
}
if(url[0] != '/')
s[n++] = '/';
memcpy(s + n, url, l - n);
return s;
}
/* Prepare the Urls for usage...
*/
MINIUPNP_LIBSPEC void
GetUPNPUrls(struct UPNPUrls * urls, struct IGDdatas * data,
const char * descURL, unsigned int scope_id)
{
/* strdup descURL */
urls->rootdescURL = strdup(descURL);
/* get description of WANIPConnection */
urls->ipcondescURL = build_absolute_url(data->urlbase, descURL,
data->first.scpdurl, scope_id);
urls->controlURL = build_absolute_url(data->urlbase, descURL,
data->first.controlurl, scope_id);
urls->controlURL_CIF = build_absolute_url(data->urlbase, descURL,
data->CIF.controlurl, scope_id);
urls->controlURL_6FC = build_absolute_url(data->urlbase, descURL,
data->IPv6FC.controlurl, scope_id);
#ifdef DEBUG
printf("urls->ipcondescURL='%s'\n", urls->ipcondescURL);
printf("urls->controlURL='%s'\n", urls->controlURL);
printf("urls->controlURL_CIF='%s'\n", urls->controlURL_CIF);
printf("urls->controlURL_6FC='%s'\n", urls->controlURL_6FC);
#endif
}
MINIUPNP_LIBSPEC void
FreeUPNPUrls(struct UPNPUrls * urls)
{
if(!urls)
return;
free(urls->controlURL);
urls->controlURL = 0;
free(urls->ipcondescURL);
urls->ipcondescURL = 0;
free(urls->controlURL_CIF);
urls->controlURL_CIF = 0;
free(urls->controlURL_6FC);
urls->controlURL_6FC = 0;
free(urls->rootdescURL);
urls->rootdescURL = 0;
}
int
UPNPIGD_IsConnected(struct UPNPUrls * urls, struct IGDdatas * data)
{
char status[64];
unsigned int uptime;
status[0] = '\0';
UPNP_GetStatusInfo(urls->controlURL, data->first.servicetype,
status, &uptime, NULL);
if(0 == strcmp("Connected", status))
return 1;
else if(0 == strcmp("Up", status)) /* Also accept "Up" */
return 1;
else
return 0;
}
/* UPNP_GetValidIGD() :
* return values :
* -1 = Internal error
* 0 = NO IGD found
* 1 = A valid connected IGD has been found
* 2 = A valid IGD has been found but it reported as
* not connected
* 3 = an UPnP device has been found but was not recognized as an IGD
*
* In any positive non zero return case, the urls and data structures
* passed as parameters are set. Don't forget to call FreeUPNPUrls(urls) to
* free allocated memory.
*/
MINIUPNP_LIBSPEC int
UPNP_GetValidIGD(struct UPNPDev * devlist,
struct UPNPUrls * urls,
struct IGDdatas * data,
char * lanaddr, int lanaddrlen)
{
struct xml_desc {
char lanaddr[40];
char * xml;
int size;
int is_igd;
} * desc = NULL;
struct UPNPDev * dev;
int ndev = 0;
int i;
int state = -1; /* state 1 : IGD connected. State 2 : IGD. State 3 : anything */
char extIpAddr[16];
int status_code = -1;
if(!devlist)
{
#ifdef DEBUG
printf("Empty devlist\n");
#endif
return 0;
}
/* counting total number of devices in the list */
for(dev = devlist; dev; dev = dev->pNext)
ndev++;
/* ndev is always > 0 */
desc = calloc(ndev, sizeof(struct xml_desc));
if(!desc)
return -1; /* memory allocation error */
/* Step 1 : downloading descriptions and testing type */
for(dev = devlist, i = 0; dev; dev = dev->pNext, i++)
{
/* we should choose an internet gateway device.
* with st == urn:schemas-upnp-org:device:InternetGatewayDevice:1 */
desc[i].xml = miniwget_getaddr(dev->descURL, &(desc[i].size),
desc[i].lanaddr, sizeof(desc[i].lanaddr),
dev->scope_id, &status_code);
#ifdef DEBUG
if(!desc[i].xml)
{
printf("error getting XML description %s\n", dev->descURL);
}
#endif
if(desc[i].xml)
{
memset(data, 0, sizeof(struct IGDdatas));
memset(urls, 0, sizeof(struct UPNPUrls));
parserootdesc(desc[i].xml, desc[i].size, data);
if(COMPARE(data->CIF.servicetype,
"urn:schemas-upnp-org:service:WANCommonInterfaceConfig:"))
{
desc[i].is_igd = 1;
}
}
}
/* iterate the list to find a device depending on state */
for(state = 1; state <= 3; state++)
{
for(dev = devlist, i = 0; dev; dev = dev->pNext, i++)
{
if(desc[i].xml)
{
memset(data, 0, sizeof(struct IGDdatas));
memset(urls, 0, sizeof(struct UPNPUrls));
parserootdesc(desc[i].xml, desc[i].size, data);
if(desc[i].is_igd || state >= 3 )
{
int is_connected;
GetUPNPUrls(urls, data, dev->descURL, dev->scope_id);
/* in state 2 and 3 we don't test if device is connected ! */
if(state >= 2)
goto free_and_return;
is_connected = UPNPIGD_IsConnected(urls, data);
#ifdef DEBUG
printf("UPNPIGD_IsConnected(%s) = %d\n",
urls->controlURL, is_connected);
#endif
/* checks that status is connected AND there is a external IP address assigned */
if(is_connected &&
(UPNP_GetExternalIPAddress(urls->controlURL, data->first.servicetype, extIpAddr) == 0)) {
if(!addr_is_reserved(extIpAddr))
goto free_and_return;
}
FreeUPNPUrls(urls);
if(data->second.servicetype[0] != '\0') {
#ifdef DEBUG
printf("We tried %s, now we try %s !\n",
data->first.servicetype, data->second.servicetype);
#endif
/* swaping WANPPPConnection and WANIPConnection ! */
memcpy(&data->tmp, &data->first, sizeof(struct IGDdatas_service));
memcpy(&data->first, &data->second, sizeof(struct IGDdatas_service));
memcpy(&data->second, &data->tmp, sizeof(struct IGDdatas_service));
GetUPNPUrls(urls, data, dev->descURL, dev->scope_id);
is_connected = UPNPIGD_IsConnected(urls, data);
#ifdef DEBUG
printf("UPNPIGD_IsConnected(%s) = %d\n",
urls->controlURL, is_connected);
#endif
if(is_connected &&
(UPNP_GetExternalIPAddress(urls->controlURL, data->first.servicetype, extIpAddr) == 0)) {
if(!addr_is_reserved(extIpAddr))
goto free_and_return;
}
FreeUPNPUrls(urls);
}
}
memset(data, 0, sizeof(struct IGDdatas));
}
}
}
state = 0;
free_and_return:
if (lanaddr != NULL && state >= 1 && state <= 3 && i < ndev)
strncpy(lanaddr, desc[i].lanaddr, lanaddrlen);
for(i = 0; i < ndev; i++)
free(desc[i].xml);
free(desc);
return state;
}
/* UPNP_GetIGDFromUrl()
* Used when skipping the discovery process.
* return value :
* 0 - Not ok
* 1 - OK */
int
UPNP_GetIGDFromUrl(const char * rootdescurl,
struct UPNPUrls * urls,
struct IGDdatas * data,
char * lanaddr, int lanaddrlen)
{
char * descXML;
int descXMLsize = 0;
descXML = miniwget_getaddr(rootdescurl, &descXMLsize,
lanaddr, lanaddrlen, 0, NULL);
if(descXML) {
memset(data, 0, sizeof(struct IGDdatas));
memset(urls, 0, sizeof(struct UPNPUrls));
parserootdesc(descXML, descXMLsize, data);
free(descXML);
GetUPNPUrls(urls, data, rootdescurl, 0);
return 1;
} else {
return 0;
}
}
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