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findserversonnetwork.c
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findserversonnetwork.c
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/* Copyright (c) 1996-2024, OPC Foundation. All rights reserved.
The source code in this file is covered under a dual - license scenario :
- RCL: for OPC Foundation members in good - standing
- GPL V2: everybody else
RCL license terms accompanied with this source code.See http ://opcfoundation.org/License/RCL/1.00/
GNU General Public License as published by the Free Software Foundation;
version 2 of the License are accompanied with this source code.See http ://opcfoundation.org/License/GPLv2
This source code is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "findserversonnetwork.h"
/* system includes */
#include <time.h>
/* mdns includes */
#include <dns_sd.h>
/* uastack includes */
#include <opcua_serverstub.h>
#include <opcua_memory.h>
#include <opcua_string.h>
#include <opcua_datetime.h>
#include <opcua_socket.h>
#include <opcua_timer.h>
#include <opcua_list.h>
#include <opcua_core.h>
/* local includes */
#include "config.h"
#include "ualds.h"
#include "settings.h"
#include "utils.h"
/* local platform includes */
#include <platform.h>
#include <log.h>
#include <opcua_p_socket.h>
static OpcUa_List g_findServersSocketList;
typedef enum _ualds_contextType
{
ContextType_Browse,
ContextType_Resolve
} ualds_contextType;
typedef struct _ualds_genericContext
{
/* generic context */
ualds_contextType contextType;
DNSServiceRef sdRef;
OpcUa_Socket uaSocket;
} ualds_genericContext;
typedef struct _ualds_browseContext
{
/* generic context */
ualds_contextType contextType;
DNSServiceRef sdRef;
OpcUa_Socket uaSocket;
/* browse context */
} ualds_browseContext;
typedef struct _ualds_resolveContext
{
/* generic context */
ualds_contextType contextType;
DNSServiceRef sdRef;
OpcUa_Socket uaSocket;
/* resolve context */
OpcUa_ServerOnNetwork record;
} ualds_resolveContext;
static OpcUa_Timer g_hBrowseTimer = OpcUa_Null;
#define g_noOfServiceTypes 3
static ualds_browseContext g_browseContexts[g_noOfServiceTypes];
static const char *g_pszServiceTypes[g_noOfServiceTypes] = {"_opcua-tcp._tcp",
"_opcua-wss._tcp",
"_opcua-https._tcp"};
static const char *g_pszServiceSchemes[g_noOfServiceTypes] = {"opc.tcp://",
"opc.wss://",
"opc.https://"};
/* list of ualds_resolveContext used as internal DNSService cache */
static OpcUa_List g_lstServers;
static OpcUa_DateTime g_lastCounterResetTime = {0, 0};
static OpcUa_UInt32 g_currentRecordId = 0;
int string_ends_with(const char * str, const char * suffix)
{
int str_len = strlen(str);
int suffix_len = strlen(suffix);
int ret = strcmp(str + (str_len - suffix_len), suffix);
return (str_len >= suffix_len) && (ret);
}
/* if pBrowseContext is one of the global browse contexts, the according browse call has been canceled.
in this case, all according entries in g_lstServers have to be removed. */
void ualds_findserversonnetwork_removeServiceEntries(ualds_browseContext *pBrowseContext)
{
OpcUa_UInt32 i;
for (i = 0; i < g_noOfServiceTypes; i++)
{
if (pBrowseContext == &g_browseContexts[i])
{
ualds_resolveContext *pResolveContext = OpcUa_Null;
ualds_log(UALDS_LOG_DEBUG, "ualds_findserversonnetwork_removeServiceEntries: remove all entries of type %s", g_pszServiceTypes[i]);
OpcUa_List_Enter(&g_lstServers);
OpcUa_List_ResetCurrent(&g_lstServers);
pResolveContext = (ualds_resolveContext*)OpcUa_List_GetCurrentElement(&g_lstServers);
while (pResolveContext)
{
if (OpcUa_StrnCmpA(g_pszServiceSchemes[i], OpcUa_String_GetRawString(&pResolveContext->record.DiscoveryUrl), OpcUa_StrLenA(g_pszServiceSchemes[i])) == 0)
{
/* cancel all outstanding service calls belonging to this service record */
if (pResolveContext->sdRef != OpcUa_Null)
{
OpcUa_Socket_Close(pResolveContext->uaSocket);
DNSServiceRefDeallocate(pResolveContext->sdRef);
pResolveContext->uaSocket = OpcUa_Null;
pResolveContext->sdRef = OpcUa_Null;
}
OpcUa_ServerOnNetwork_Clear(&pResolveContext->record);
OpcUa_Free(pResolveContext);
OpcUa_List_DeleteCurrentElement(&g_lstServers);
pResolveContext = (ualds_resolveContext*)OpcUa_List_GetCurrentElement(&g_lstServers);
}
else
{
pResolveContext = (ualds_resolveContext*)OpcUa_List_GetNextElement(&g_lstServers);
}
}
OpcUa_List_Leave(&g_lstServers);
break;
}
}
}
void ualds_findserversonnetwork_socketEventCallback(int* shutdown)
{
fd_set readFDs;
struct timeval tv;
int fd, status;
ualds_genericContext* context;
MulticastSocketCallbackStruct* socketCallbackStruct;
if (*shutdown)
{
return;
}
/*
TODO:
This should be combined with zerconf socket callback into one "poll" loop that builds
pollfd or select bitmask from the socket cb list. This would then be driven from main.
*/
/* Lock access to shared sdref/fd from server processing thread */
OpcUa_Mutex_Lock(g_mutex);
OpcUa_List_Enter(&g_findServersSocketList);
OpcUa_List_ResetCurrent(&g_findServersSocketList);
socketCallbackStruct = (MulticastSocketCallbackStruct*)OpcUa_List_GetCurrentElement(&g_findServersSocketList);
while (socketCallbackStruct)
{
context = (ualds_genericContext*)socketCallbackStruct->context;
if (*shutdown || context == OpcUa_Null || context->sdRef == OpcUa_Null)
{
/* browse or resolve failed or was stopped - remove socket from poll list */
OpcUa_Free(socketCallbackStruct);
OpcUa_List_DeleteCurrentElement(&g_findServersSocketList);
socketCallbackStruct = (MulticastSocketCallbackStruct*)OpcUa_List_GetCurrentElement(&g_findServersSocketList);
continue;
}
fd = DNSServiceRefSockFD(socketCallbackStruct->sdRef);
FD_ZERO(&readFDs);
FD_SET(fd, &readFDs);
tv.tv_sec = 0;
tv.tv_usec = 100000;
status = select(fd + 1, &readFDs, NULL, NULL, &tv);
if (status > 0)
{
if (FD_ISSET(fd, &readFDs))
{
int error = DNSServiceProcessResult(socketCallbackStruct->sdRef);
if (error != kDNSServiceErr_NoError)
{
ualds_log(UALDS_LOG_ERR, "ualds_findserversonnetwork_socketEventCallback: DNSServiceProcessResult returned error %i", error);
}
}
}
socketCallbackStruct = (MulticastSocketCallbackStruct*)OpcUa_List_GetNextElement(&g_findServersSocketList);
}
OpcUa_List_Leave(&g_findServersSocketList);
OpcUa_Mutex_Unlock(g_mutex);
}
/* async DNSService callback for browse result resolving */
void DNSSD_API ualds_DNSServiceResolveReply(DNSServiceRef sdRef,
DNSServiceFlags flags,
uint32_t interfaceIndex,
DNSServiceErrorType errorCode,
const char *fullname,
const char *hosttarget,
uint16_t port,
uint16_t txtLen,
const unsigned char *txtRecord,
void *context)
{
ualds_resolveContext *pResolveContext = (ualds_resolveContext*)context;
OpcUa_ServerOnNetwork *pRecord = &pResolveContext->record;
uint16_t hostOrderPort = ntohs(port);
UALDS_UNUSED(sdRef);
UALDS_UNUSED(flags);
if (errorCode != kDNSServiceErr_NoError)
{
ualds_log(UALDS_LOG_ERR, "ualds_DNSServiceResolveReply: error %i", errorCode);
goto Error;
}
/* debug traces */
ualds_log(UALDS_LOG_DEBUG, "ualds_DNSServiceResolveReply: resolved service:");
ualds_log(UALDS_LOG_DEBUG, " interfaceIndex %u", interfaceIndex);
ualds_log(UALDS_LOG_DEBUG, " fullname %s", fullname);
ualds_log(UALDS_LOG_DEBUG, " hosttarget %s", hosttarget);
ualds_log(UALDS_LOG_DEBUG, " port %hu", hostOrderPort);
/* fill results */
OpcUa_String_StrnCat(&pRecord->DiscoveryUrl,
OpcUa_String_FromCString((OpcUa_StringA)hosttarget),
strlen(hosttarget));
char szPort[40] = { 0 };
#if OPCUA_USE_SAFE_FUNCTIONS
OpcUa_SnPrintfA(szPort, 40, 40, ":%hu", hostOrderPort);
#else
OpcUa_SnPrintfA(szPort, 40, ":%hu", hostOrderPort);
#endif
OpcUa_String_StrnCat(&pRecord->DiscoveryUrl,
OpcUa_String_FromCString(szPort),
OPCUA_STRING_LENDONTCARE);
if (TXTRecordContainsKey(txtLen, txtRecord, "path"))
{
uint8_t lenPath = 0;
const char *szPath = TXTRecordGetValuePtr(txtLen, txtRecord, "path", &lenPath);
if (lenPath > 0 && szPath != OpcUa_Null)
{
OpcUa_String_StrnCat(&pRecord->DiscoveryUrl,
OpcUa_String_FromCString((OpcUa_StringA)szPath),
lenPath);
}
}
if (TXTRecordContainsKey(txtLen, txtRecord, "caps"))
{
uint8_t lenCaps = 0;
const char *szCaps = TXTRecordGetValuePtr(txtLen, txtRecord, "caps", &lenCaps);
if (lenCaps > 0 && szCaps != OpcUa_Null && szCaps[0] != '\0')
{
const char *szLastPos = szCaps;
int i = 0, iCap = 0;
pRecord->NoOfServerCapabilities = 1;
for (i = 0; i < lenCaps; i++)
{
if (szCaps[i] == ',' && szCaps[i+1] != ',' && i+1 != lenCaps) {pRecord->NoOfServerCapabilities++;}
}
pRecord->ServerCapabilities = (OpcUa_String*)OpcUa_Alloc(pRecord->NoOfServerCapabilities * sizeof(OpcUa_String));
for (i = 0; i < lenCaps; i++)
{
if (szCaps[i] == ',' && szCaps[i+1] != ',' && i+1 != lenCaps)
{
OpcUa_String_Initialize(&pRecord->ServerCapabilities[iCap]);
OpcUa_String_AttachToString((OpcUa_StringA)szLastPos,
&szCaps[i] - szLastPos,
&szCaps[i] - szLastPos,
OpcUa_True,
OpcUa_True,
&pRecord->ServerCapabilities[iCap]);
iCap++;
szLastPos = &szCaps[i+1];
}
}
OpcUa_String_Initialize(&pRecord->ServerCapabilities[iCap]);
OpcUa_String_AttachToString((OpcUa_StringA)szLastPos,
&szCaps[i] - szLastPos,
&szCaps[i] - szLastPos,
OpcUa_True,
OpcUa_True,
&pRecord->ServerCapabilities[iCap]);
}
}
Error:
OpcUa_Socket_Close(pResolveContext->uaSocket);
DNSServiceRefDeallocate(pResolveContext->sdRef);
pResolveContext->uaSocket = OpcUa_Null;
pResolveContext->sdRef = OpcUa_Null;
}
/* async DNSService callback for browse results */
void DNSSD_API ualds_DNSServiceBrowseReply(DNSServiceRef sdRef,
DNSServiceFlags flags,
uint32_t interfaceIndex,
DNSServiceErrorType errorCode,
const char *serviceName,
const char *regtype,
const char *replyDomain,
void *context)
{
ualds_browseContext *pBrowseContext = (ualds_browseContext*)context;
UALDS_UNUSED(sdRef);
if (errorCode != kDNSServiceErr_NoError)
{
ualds_log(UALDS_LOG_ERR, "ualds_DNSServiceBrowseReply: error %i", errorCode);
goto Error;
}
if (flags & kDNSServiceFlagsAdd)
{
/* existing service, resolve it */
ualds_resolveContext *pResolveContext = OpcUa_Null;
DNSServiceErrorType retDnssd = kDNSServiceErr_NoError;
OpcUa_Boolean bFound = OpcUa_False;
char szDiscoveryUrl[UALDS_CONF_MAX_URI_LENGTH] = {0};
OpcUa_UInt32 i = 0;
OpcUa_Boolean bFoundSchema = OpcUa_False;
for (i = 0; i < g_noOfServiceTypes; i++)
{
if (strncmp(regtype, g_pszServiceTypes[i], strlen(g_pszServiceTypes[i])) == 0)
{
strlcat(szDiscoveryUrl, g_pszServiceSchemes[i], UALDS_CONF_MAX_URI_LENGTH);
bFoundSchema = OpcUa_True;
break;
}
}
if (bFoundSchema == OpcUa_False)
{
ualds_log(UALDS_LOG_DEBUG, "ignoring invalid regtype %s", regtype);
goto Error;
}
if (szDiscoveryUrl[0] == '\0')
{
ualds_log(UALDS_LOG_DEBUG, "ualds_DNSServiceBrowseReply: ignoring invalid regtype %s", regtype);
goto Error;
}
/* check if record is already known; this can happen if a service is delivered for two different
network interfaces */
OpcUa_List_Enter(&g_lstServers);
OpcUa_List_ResetCurrent(&g_lstServers);
pResolveContext = (ualds_resolveContext*)OpcUa_List_GetCurrentElement(&g_lstServers);
while (pResolveContext)
{
if (OpcUa_StrCmpA(serviceName, OpcUa_String_GetRawString(&pResolveContext->record.ServerName)) == 0 &&
OpcUa_StrnCmpA(szDiscoveryUrl, OpcUa_String_GetRawString(&pResolveContext->record.DiscoveryUrl), strlen(szDiscoveryUrl)) == 0)
{
bFound = OpcUa_True;
break;
}
pResolveContext = (ualds_resolveContext*)OpcUa_List_GetNextElement(&g_lstServers);
}
OpcUa_List_Leave(&g_lstServers);
if (bFound != OpcUa_False)
{
ualds_log(UALDS_LOG_DEBUG, "ualds_DNSServiceBrowseReply: ignoring known service %s / %s", serviceName, regtype);
goto Error;
}
/* fill results */
pResolveContext = (ualds_resolveContext*)OpcUa_Alloc(sizeof(ualds_resolveContext));
if (pResolveContext)
{
OpcUa_StatusCode uStatus = OpcUa_Good;
pResolveContext->contextType = ContextType_Resolve;
pResolveContext->uaSocket = OpcUa_Null;
OpcUa_ServerOnNetwork_Initialize(&pResolveContext->record);
/* debug traces */
ualds_log(UALDS_LOG_DEBUG, "ualds_DNSServiceBrowseReply: received service:");
ualds_log(UALDS_LOG_DEBUG, " interfaceIndex %u", interfaceIndex);
ualds_log(UALDS_LOG_DEBUG, " serviceName %s", serviceName);
ualds_log(UALDS_LOG_DEBUG, " regtype %s", regtype);
ualds_log(UALDS_LOG_DEBUG, " replyDomain %s", replyDomain);
OpcUa_String_AttachToString((OpcUa_StringA)szDiscoveryUrl,
strlen(szDiscoveryUrl),
strlen(szDiscoveryUrl),
OpcUa_True,
OpcUa_True,
&pResolveContext->record.DiscoveryUrl);
/* set service name and type */
OpcUa_String_AttachToString((OpcUa_StringA)serviceName,
strlen(serviceName),
strlen(serviceName),
OpcUa_True,
OpcUa_True,
&pResolveContext->record.ServerName);
/* set RecordId */
pResolveContext->record.RecordId = g_currentRecordId++;
if (g_currentRecordId == 0)
{
ualds_resolveContext *pExistingResolveContext = OpcUa_Null;
g_lastCounterResetTime = OpcUa_DateTime_UtcNow();
/* reassign RecordIds to entries after overflow */
OpcUa_List_Enter(&g_lstServers);
OpcUa_List_ResetCurrent(&g_lstServers);
pExistingResolveContext = (ualds_resolveContext*)OpcUa_List_GetCurrentElement(&g_lstServers);
while (pExistingResolveContext)
{
pExistingResolveContext->record.RecordId = g_currentRecordId++;
pExistingResolveContext = (ualds_resolveContext*)OpcUa_List_GetNextElement(&g_lstServers);
}
pResolveContext->record.RecordId = g_currentRecordId++;
OpcUa_List_Leave(&g_lstServers);
}
/* append pResolveContext to list of services */
OpcUa_List_Enter(&g_lstServers);
uStatus = OpcUa_List_AddElementToEnd(&g_lstServers, pResolveContext);
OpcUa_List_Leave(&g_lstServers);
if (OpcUa_IsNotGood(uStatus))
{
ualds_log(UALDS_LOG_ERR, "ualds_DNSServiceBrowseReply: could not add pResolveContext to list");
goto Error;
}
ualds_log(UALDS_LOG_DEBUG, "ualds_DNSServiceBrowseReply: Call DNSServiceResolve");
retDnssd = DNSServiceResolve(&pResolveContext->sdRef,
0,
interfaceIndex,
serviceName,
regtype,
replyDomain,
ualds_DNSServiceResolveReply,
pResolveContext);
/* process results */
if (retDnssd == kDNSServiceErr_NoError)
{
OpcUa_List_Enter(&g_lstServers);
if (pResolveContext->sdRef)
{
MulticastSocketCallbackStruct* socketCallbackStruct = OpcUa_Alloc(sizeof(MulticastSocketCallbackStruct));
socketCallbackStruct->sdRef = pResolveContext->sdRef;
socketCallbackStruct->context = pResolveContext;
/* Lock is not needed - called on poll thread so just add to end and be done with it... */
/* OpcUa_List_Enter(&g_findServersSocketList); */
uStatus = OpcUa_List_AddElementToEnd(&g_findServersSocketList, socketCallbackStruct);
/* OpcUa_List_Leave(&g_findServersSocketList); */
}
OpcUa_List_Leave(&g_lstServers);
}
else
{
ualds_log(UALDS_LOG_ERR, "ualds_DNSServiceBrowseReply: DNSServiceResolve returned error %i", retDnssd);
goto Error;
}
}
else
{
ualds_log(UALDS_LOG_ERR, "ualds_DNSServiceBrowseReply: could not allocate pResolveContext");
goto Error;
}
}
else
{
/* remove record as it it not longer valid */
ualds_resolveContext *pResolveContext = OpcUa_Null;
char szDiscoveryUrl[UALDS_CONF_MAX_URI_LENGTH] = {0};
OpcUa_UInt32 i = 0;
/* debug traces */
ualds_log(UALDS_LOG_DEBUG, "ualds_DNSServiceBrowseReply: remove service:");
ualds_log(UALDS_LOG_DEBUG, " interfaceIndex %u", interfaceIndex);
ualds_log(UALDS_LOG_DEBUG, " serviceName %s", serviceName);
ualds_log(UALDS_LOG_DEBUG, " regtype %s", regtype);
ualds_log(UALDS_LOG_DEBUG, " replyDomain %s", replyDomain);
for (i = 0; i < g_noOfServiceTypes; i++)
{
if (strncmp(regtype, g_pszServiceTypes[i], strlen(g_pszServiceTypes[i])) == 0)
{
strlcat(szDiscoveryUrl, g_pszServiceSchemes[i], UALDS_CONF_MAX_URI_LENGTH);
break;
}
}
if (szDiscoveryUrl[0] == '\0')
{
ualds_log(UALDS_LOG_DEBUG, "ualds_DNSServiceBrowseReply: ignoring invalid regtype %s", regtype);
goto Error;
}
/* search for server and remove it */
OpcUa_List_Enter(&g_lstServers);
OpcUa_List_ResetCurrent(&g_lstServers);
pResolveContext = (ualds_resolveContext*)OpcUa_List_GetCurrentElement(&g_lstServers);
while (pResolveContext)
{
if (OpcUa_StrCmpA(serviceName, OpcUa_String_GetRawString(&pResolveContext->record.ServerName)) == 0 &&
OpcUa_StrnCmpA(szDiscoveryUrl, OpcUa_String_GetRawString(&pResolveContext->record.DiscoveryUrl), strlen(szDiscoveryUrl)) == 0)
{
/* cancel all outstanding service calls belonging to this service record */
if (pResolveContext->sdRef != OpcUa_Null)
{
OpcUa_Socket_Close(pResolveContext->uaSocket);
DNSServiceRefDeallocate(pResolveContext->sdRef);
pResolveContext->uaSocket = OpcUa_Null;
pResolveContext->sdRef = OpcUa_Null;
}
OpcUa_ServerOnNetwork_Clear(&pResolveContext->record);
OpcUa_Free(pResolveContext);
OpcUa_List_DeleteCurrentElement(&g_lstServers);
break;
}
pResolveContext = (ualds_resolveContext*)OpcUa_List_GetNextElement(&g_lstServers);
}
OpcUa_List_Leave(&g_lstServers);
}
Error:
if (errorCode != kDNSServiceErr_NoError)
{
OpcUa_Socket_Close(pBrowseContext->uaSocket);
DNSServiceRefDeallocate(pBrowseContext->sdRef);
pBrowseContext->uaSocket = OpcUa_Null;
pBrowseContext->sdRef = OpcUa_Null;
/* when cancelling a Browse call, remove according entries in service list */
ualds_findserversonnetwork_removeServiceEntries(pBrowseContext);
}
}
OpcUa_StatusCode OPCUA_DLLCALL ualds_findserversonnetwork_start_internal(OpcUa_Void* pvCallbackData,
OpcUa_Timer hTimer,
OpcUa_UInt32 msecElapsed)
{
OpcUa_StatusCode uStatus = OpcUa_Good;
DNSServiceErrorType retDnssd = kDNSServiceErr_NoError;
unsigned int i;
UALDS_UNUSED(pvCallbackData);
UALDS_UNUSED(hTimer);
UALDS_UNUSED(msecElapsed);
OpcUa_Mutex_Lock(g_mutex);
for (i = 0; i < g_noOfServiceTypes; i++)
{
if (g_browseContexts[i].sdRef == OpcUa_Null)
{
g_browseContexts[i].contextType = ContextType_Browse;
/* browse for services */
ualds_log(UALDS_LOG_DEBUG, "ualds_findserversonnetwork_start_internal: Call DNSServiceBrowse for service type %s", g_pszServiceTypes[i]);
retDnssd = DNSServiceBrowse(&g_browseContexts[i].sdRef,
0,
0,
g_pszServiceTypes[i],
0,
ualds_DNSServiceBrowseReply,
&g_browseContexts[i]);
if (retDnssd == kDNSServiceErr_NoError)
{
if (g_browseContexts[i].sdRef)
{
MulticastSocketCallbackStruct* socketCallbackStruct = OpcUa_Alloc(sizeof(MulticastSocketCallbackStruct));
socketCallbackStruct->sdRef = g_browseContexts[i].sdRef;
socketCallbackStruct->context = &g_browseContexts[i];
OpcUa_List_Enter(&g_findServersSocketList);
uStatus = OpcUa_List_AddElementToEnd(&g_findServersSocketList, socketCallbackStruct);
OpcUa_List_Leave(&g_findServersSocketList);
}
}
else
{
ualds_log(UALDS_LOG_ERR, "ualds_findserversonnetwork_start_internal: DNSServiceBrowse returned error %i", retDnssd);
}
}
}
OpcUa_Mutex_Unlock(g_mutex);
return uStatus;
}
OpcUa_StatusCode OPCUA_DLLCALL ualds_findserversonnetwork_stop_internal(OpcUa_Void* pvCallbackData,
OpcUa_Timer hTimer,
OpcUa_UInt32 msecElapsed)
{
unsigned int i;
UALDS_UNUSED(pvCallbackData);
UALDS_UNUSED(hTimer);
UALDS_UNUSED(msecElapsed);
OpcUa_Mutex_Lock(g_mutex);
for (i = 0; i < g_noOfServiceTypes; i++)
{
/* release ref for stopping the browse */
ualds_log(UALDS_LOG_DEBUG, "ualds_findserversonnetwork_stop_internal: Call DNSServiceRefDeallocate for browse for service type %s", g_pszServiceTypes[i]);
OpcUa_Socket_Close(g_browseContexts[i].uaSocket);
DNSServiceRefDeallocate(g_browseContexts[i].sdRef);
g_browseContexts[i].uaSocket = OpcUa_Null;
g_browseContexts[i].sdRef = OpcUa_Null;
}
OpcUa_Mutex_Unlock(g_mutex);
return OpcUa_Good;
}
OpcUa_StatusCode ualds_findserversonnetwork_start_listening()
{
OpcUa_StatusCode ret = OpcUa_BadNothingToDo;
if (g_hBrowseTimer == OpcUa_Null)
{
int iBrowseCheckInterval = 10;
OpcUa_Mutex_Lock(g_mutex);
/* initialize */
OpcUa_List_Initialize(&g_lstServers);
OpcUa_List_Initialize(&g_findServersSocketList);
g_lastCounterResetTime = OpcUa_DateTime_UtcNow();
OpcUa_Mutex_Unlock(g_mutex);
/* First ever browse - unlock mutex we internal browse will lock it again */
ualds_findserversonnetwork_start_internal(OpcUa_Null, OpcUa_Null, 0);
OpcUa_Mutex_Lock(g_mutex);
/* get RegistrationInterval setting */
ualds_settings_begingroup("Zeroconf");
ualds_settings_readint("RegistrationInterval", &iBrowseCheckInterval);
if (iBrowseCheckInterval < 5)
{
iBrowseCheckInterval = 5;
}
ualds_settings_endgroup();
OpcUa_Mutex_Unlock(g_mutex);
/* create timer for regular checking of registration */
ualds_log(UALDS_LOG_INFO, "Create Zeroconf browse timer with interval %i", iBrowseCheckInterval);
ret = OpcUa_Timer_Create(&g_hBrowseTimer,
iBrowseCheckInterval * 1000,
ualds_findserversonnetwork_start_internal,
ualds_findserversonnetwork_stop_internal,
OpcUa_Null);
}
return ret;
}
void ualds_findserversonnetwork_stop_listening()
{
if (g_hBrowseTimer != OpcUa_Null)
{
ualds_resolveContext *pResolveContext = OpcUa_Null;
/* delete browse timer, this automatically calls the unregister function */
ualds_log(UALDS_LOG_INFO, "Delete Zeroconf browse timer");
OpcUa_Timer_Delete(&g_hBrowseTimer);
g_hBrowseTimer = OpcUa_Null;
/* cleanup */
OpcUa_List_Enter(&g_lstServers);
OpcUa_List_ResetCurrent(&g_lstServers);
pResolveContext = (ualds_resolveContext*)OpcUa_List_GetCurrentElement(&g_lstServers);
while (pResolveContext)
{
/* cancel all outstanding service calls belonging to this service record */
if (pResolveContext->sdRef != OpcUa_Null)
{
OpcUa_Socket_Close(pResolveContext->uaSocket);
DNSServiceRefDeallocate(pResolveContext->sdRef);
pResolveContext->uaSocket = OpcUa_Null;
pResolveContext->sdRef = OpcUa_Null;
}
OpcUa_ServerOnNetwork_Clear(&pResolveContext->record);
OpcUa_Free(pResolveContext);
pResolveContext = (ualds_resolveContext*)OpcUa_List_GetNextElement(&g_lstServers);
}
OpcUa_List_Leave(&g_lstServers);
OpcUa_List_Clear(&g_lstServers);
// remove element from g_findServersSocketList
OpcUa_List_Enter(&g_findServersSocketList);
OpcUa_List_ResetCurrent(&g_findServersSocketList);
MulticastSocketCallbackStruct* socketCallbackStruct = (MulticastSocketCallbackStruct*)OpcUa_List_GetCurrentElement(&g_findServersSocketList);
while (socketCallbackStruct)
{
OpcUa_Free(socketCallbackStruct);
socketCallbackStruct = (MulticastSocketCallbackStruct*)OpcUa_List_GetNextElement(&g_findServersSocketList);
}
OpcUa_List_Leave(&g_findServersSocketList);
OpcUa_List_Clear(&g_findServersSocketList);
}
}
/** FindDnsServices Service implementation.
* @param hEndpoint OPC UA Endpoint handle.
* @param hContext Service context.
* @param ppRequest Pointer to decoded service request structure.
* @param pRequestType The service type.
*
* @return OpcUa_StatusCode
*/
OpcUa_StatusCode ualds_findserversonnetwork(OpcUa_Endpoint hEndpoint,
OpcUa_Handle hContext,
OpcUa_Void **ppRequest,
OpcUa_EncodeableType *pRequestType)
{
OpcUa_FindServersOnNetworkRequest *pRequest;
OpcUa_FindServersOnNetworkResponse *pResponse;
OpcUa_EncodeableType *pResponseType = 0;
OpcUa_StatusCode uStatus = OpcUa_Good;
OpcUa_UInt32 i;
OpcUa_Boolean bIncludeRecord;
UALDS_UNUSED(pRequestType);
OpcUa_ReturnErrorIfArgumentNull(ppRequest);
pRequest = *ppRequest;
uStatus = OpcUa_Endpoint_BeginSendResponse(hEndpoint,
hContext,
(OpcUa_Void**)&pResponse,
&pResponseType);
OpcUa_ReturnErrorIfBad(uStatus);
if (pResponse)
{
if (OpcUa_IsGood(uStatus))
{
/* fill results */
ualds_resolveContext *pResolveContext = OpcUa_Null;
pResponse->LastCounterResetTime = g_lastCounterResetTime;
OpcUa_List_Enter(&g_lstServers);
OpcUa_List_ResetCurrent(&g_lstServers);
pResolveContext = (ualds_resolveContext*)OpcUa_List_GetCurrentElement(&g_lstServers);
while (pResolveContext)
{
// check if DiscoveryUrl is ready
if ( (OpcUa_String_IsNull(&(pResolveContext->record.DiscoveryUrl)) == OpcUa_True) ||
(OpcUa_String_IsEmpty(&(pResolveContext->record.DiscoveryUrl)) == OpcUa_True))
{
bIncludeRecord = OpcUa_False;
}
else
{
bIncludeRecord = OpcUa_True;
// check if DiscoveryUrl is not just the scheme, but has a resolved name...
for (i = 0; i < g_noOfServiceTypes; i++)
{
if (OpcUa_StrnCmpA(g_pszServiceSchemes[i], OpcUa_String_GetRawString(&pResolveContext->record.DiscoveryUrl),
OpcUa_String_StrLen(&pResolveContext->record.DiscoveryUrl)) == 0)
{
ualds_log(UALDS_LOG_DEBUG, "ualds_findserversonnetwork: skip record as discovery url is not set.");
bIncludeRecord = OpcUa_False;
break;
}
}
}
if (bIncludeRecord != OpcUa_False)
{
if (pRequest->StartingRecordId != 0 &&
pResolveContext->record.RecordId <= pRequest->StartingRecordId)
{
ualds_log(UALDS_LOG_DEBUG, "ualds_findserversonnetwork: skip record as StartingRecordId is set (%u)", pRequest->StartingRecordId);
bIncludeRecord = OpcUa_False;
}
else if (pRequest->NoOfServerCapabilityFilter > 0)
{
OpcUa_Int32 iFilter = 0, iCap = 0;
for (iFilter = 0; iFilter < pRequest->NoOfServerCapabilityFilter; iFilter++)
{
OpcUa_Boolean bFoundCap = OpcUa_False;
OpcUa_String *pFilter = &pRequest->ServerCapabilityFilter[iFilter];
for (iCap = 0; iCap < pResolveContext->record.NoOfServerCapabilities; iCap++)
{
OpcUa_String *pCap = &pResolveContext->record.ServerCapabilities[iCap];
if (OpcUa_String_StrnCmp(pFilter, pCap, OPCUA_STRING_LENDONTCARE, OpcUa_True) == 0)
{
bFoundCap = OpcUa_True;
break;
}
}
if (bFoundCap == OpcUa_False)
{
// No caps match. Check if NA is requested and there are no caps available
if (pResolveContext->record.NoOfServerCapabilities == 0 &&
(OpcUa_String_StrnCmp(pFilter, OpcUa_String_FromCString("NA"), OPCUA_STRING_LENDONTCARE, OpcUa_True) == 0))
{
bFoundCap = OpcUa_True;
break;
}
else
{
bIncludeRecord = OpcUa_False;
break;
}
}
}
}
}
if (bIncludeRecord != OpcUa_False)
{
OpcUa_ServerOnNetwork *pTmpServices = OpcUa_Null;
if (pRequest->MaxRecordsToReturn != 0 &&
(OpcUa_UInt32)pResponse->NoOfServers >= pRequest->MaxRecordsToReturn)
{
ualds_log(UALDS_LOG_DEBUG, "ualds_findserversonnetwork: max number of records to return reached (%i)", pResponse->NoOfServers);
break;
}
pResponse->NoOfServers++;
pTmpServices = (OpcUa_ServerOnNetwork*)OpcUa_ReAlloc(pResponse->Servers,
pResponse->NoOfServers * sizeof(OpcUa_ServerOnNetwork));
if (pTmpServices)
{
OpcUa_UInt32 uPos = pResponse->NoOfServers-1;
pResponse->Servers = pTmpServices;
OpcUa_ServerOnNetwork_Initialize(&pResponse->Servers[uPos]);
pResponse->Servers[uPos].RecordId = pResolveContext->record.RecordId;
OpcUa_String_StrnCpy(&pResponse->Servers[uPos].ServerName, &pResolveContext->record.ServerName, OPCUA_STRING_LENDONTCARE);
OpcUa_String_StrnCpy(&pResponse->Servers[uPos].DiscoveryUrl, &pResolveContext->record.DiscoveryUrl, OPCUA_STRING_LENDONTCARE);
pResponse->Servers[uPos].NoOfServerCapabilities = pResolveContext->record.NoOfServerCapabilities;
if (pResolveContext->record.NoOfServerCapabilities > 0)
{
OpcUa_Int32 iCap = 0;
pResponse->Servers[uPos].ServerCapabilities = (OpcUa_String*)OpcUa_Alloc(pResolveContext->record.NoOfServerCapabilities * sizeof(OpcUa_String));
for (iCap = 0; iCap < pResolveContext->record.NoOfServerCapabilities; iCap++)
{
OpcUa_String_Initialize(&pResponse->Servers[uPos].ServerCapabilities[iCap]);
OpcUa_String_StrnCpy(&pResponse->Servers[uPos].ServerCapabilities[iCap], &pResolveContext->record.ServerCapabilities[iCap], OPCUA_STRING_LENDONTCARE);
}
}
}
else
{
OpcUa_Int32 i;
ualds_log(UALDS_LOG_ERR, "ualds_findserversonnetwork: Could not allocate memory for pResponse->Servers");
uStatus = OpcUa_BadOutOfMemory;
pResponse->NoOfServers--;
for (i = 0; i < pResponse->NoOfServers; i++)
{
OpcUa_ServerOnNetwork_Clear(&pResponse->Servers[i]);
}
pResponse->NoOfServers = 0;
break;
}
}
pResolveContext = (ualds_resolveContext*)OpcUa_List_GetNextElement(&g_lstServers);
}
OpcUa_List_Leave(&g_lstServers);
}
UALDS_BUILDRESPONSEHEADER;
/* Send response */
OpcUa_Endpoint_EndSendResponse(
hEndpoint,
&hContext,
uStatus,
pResponse,
pResponseType);
/* free response */
OpcUa_FindServersOnNetworkResponse_Clear(pResponse);
OpcUa_Free(pResponse);
/* we have sent a response, either with good or bad status, this does not matter.
* we must return Good now, otherwise the stack will send an error message.
*/
uStatus = OpcUa_Good;
}
return uStatus;
}
void ualds_zeroconf_register_offline(const char *szServerUri)
{
ualds_settings_begingroup(szServerUri);
/* get Server name */
char szMDNSServerName[UALDS_CONF_MAX_URI_LENGTH];
szMDNSServerName[0] = 0;
ualds_settings_readstring("MdnsServerName", szMDNSServerName, UALDS_CONF_MAX_URI_LENGTH);
if (szMDNSServerName[0] == 0)
{
int numNames = 0, i = 0;
ualds_settings_beginreadarray("ServerNames", &numNames);
for (i = 0; i < numNames; i++)
{
ualds_settings_setarrayindex(i);
ualds_settings_readstring("Text", szMDNSServerName, UALDS_CONF_MAX_URI_LENGTH);
if (szMDNSServerName[0] == 0)
{
break;
}
}
ualds_settings_endarray();
}
// replace [gethostname] if necessary
char szHostname[UALDS_CONF_MAX_URI_LENGTH];
ualds_platform_getfqhostname(szHostname, UALDS_CONF_MAX_URI_LENGTH);
replace_string(szMDNSServerName, UALDS_CONF_MAX_URI_LENGTH, "[gethostname]", szHostname);
// get number of Capabilities
int numCaps = 0;
char** capabilities = OpcUa_Null;
ualds_settings_beginreadarray("ServerCapabilities", &numCaps);
if (numCaps > 0)
{
capabilities = OpcUa_Alloc(numCaps * sizeof(char*));
OpcUa_MemSet(capabilities, 0, numCaps * sizeof(char*));
int k = 0;
for (k = 0; k < numCaps; k++)
{
// get capability
char szCapability[UALDS_CONF_MAX_URI_LENGTH];
ualds_settings_setarrayindex(k);
ualds_settings_readstring("Capability", szCapability, UALDS_CONF_MAX_URI_LENGTH);
ualds_settings_endarray();
capabilities[k] = OpcUa_Alloc(UALDS_CONF_MAX_URI_LENGTH);
strlcpy(capabilities[k], szCapability, UALDS_CONF_MAX_URI_LENGTH);
}
}
// read number of DiscoveryURL
int numDiscoveryUrls = 0;
int j = 0;
ualds_settings_beginreadarray("DiscoveryUrls", &numDiscoveryUrls);
if (numDiscoveryUrls > 0)
{
for (j = 0; j < numDiscoveryUrls; j++)
{
ualds_resolveContext* pResolveContext = (ualds_resolveContext*)OpcUa_Alloc(sizeof(ualds_resolveContext));
if (pResolveContext)
{
OpcUa_StatusCode uStatus = OpcUa_Good;