onvif规范的实现：server端Discovery实现，通过OnvifTestTool12.06测试

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说明：网上关于ONVIF开发的文章并不多，也更找不到具体的实例来入门学习。只能靠翻阅各种Specification摸索中前进，下面是最近几天的成果。调通了服务端（或者说设备端）的Discovery，使用OnvifTestTool12.06能够搜到我的设备。【来自http://blog.csdn.net/ghostyu】

1、在使用wsdl2h产生头文件前需要修改typemap.dat，

修改的依据在这里：http://www.cs.fsu.edu/~engelen/soap.html，在FAQ页面下的How do I use gSOAP for the ONVIF specifications?

#Use gSOAP 2.8.10 and up. In the typemap.dat file used by wsdl2h, add:
# ONVIF recommended prefixes
tds = "http://www.onvif.org/ver10/device/wsdl"
tev = "http://www.onvif.org/ver10/events/wsdl"
tls = "http://www.onvif.org/ver10/display/wsdl"
tmd = "http://www.onvif.org/ver10/deviceIO/wsdl"
timg = "http://www.onvif.org/ver20/imaging/wsdl"
trt = "http://www.onvif.org/ver10/media/wsdl"
tptz = "http://www.onvif.org/ver20/ptz/wsdl"
trv = "http://www.onvif.org/ver10/receiver/wsdl"
trc = "http://www.onvif.org/ver10/recording/wsdl"
tse = "http://www.onvif.org/ver10/search/wsdl"
trp = "http://www.onvif.org/ver10/replay/wsdl"
tan = "http://www.onvif.org/ver20/analytics/wsdl"
tad = "http://www.onvif.org/ver10/analyticsdevice/wsdl"
tdn = "http://www.onvif.org/ver10/network/wsdl"
tt = "http://www.onvif.org/ver10/schema"
# OASIS recommended prefixes
wsnt = "http://docs.oasis-open.org/wsn/b-2"
wsntw = "http://docs.oasis-open.org/wsn/bw-2"
wsrfbf = "http://docs.oasis-open.org/wsrf/bf-2"
wsrfr = "http://docs.oasis-open.org/wsrf/r-2"
wsrfrw = "http://docs.oasis-open.org/wsrf/rw-2"
wstop = "http://docs.oasis-open.org/wsn/t-1"
# WS-Discovery 1.0 remapping
wsdd10__HelloType = | wsdd__HelloType
wsdd10__ByeType = | wsdd__ByeType
wsdd10__ProbeType = | wsdd__ProbeType
wsdd10__ProbeMatchesType = | wsdd__ProbeMatchesType
wsdd10__ProbeMatchType = | wsdd__ProbeMatchType
wsdd10__ResolveType = | wsdd__ResolveType
wsdd10__ResolveMatchesType = | wsdd__ResolveMatchesType
wsdd10__ResolveMatchType = | wsdd__ResolveMatchType
# SOAP-ENV mapping
SOAP_ENV__Envelope = struct SOAP_ENV__Envelope { struct SOAP_ENV__Header *SOAP_ENV__Header; _XML SOAP_ENV__Body; }; | struct SOAP_ENV__Envelope
SOAP_ENV__Header = | struct SOAP_ENV__Header
SOAP_ENV__Fault = | struct SOAP_ENV__Fault
SOAP_ENV__Detail = | struct SOAP_ENV__Detail
SOAP_ENV__Code = | struct SOAP_ENV__Code
SOAP_ENV__Subcode = | struct SOAP_ENV__Subcode
SOAP_ENV__Reason = | struct SOAP_ENV__Reason

2、根据onvif官网提供的remotediscovery.wsdl产生onvif.h头文件

关于onvif所有的wsdl都在这里：http://www.onvif.org/Documents/Specifications.aspx中的ONVIF WSDL and XML Schemas Specifications一节，虽然可以全部下载为wsdl文件，但是wsdl文件中存在相互依赖的关系，并且是带有存储的依赖，所以最好直接使用url来产生头文件，不要下载下来。

wsdl2h -o onvif.h -c -s -t ./typemap.dat http://www.onvif.org/onvif/ver10/network/wsdl/remotediscovery.wsdl

3、使用onvif.h来产生骨架代码

soapcpp2 -c onvif.h -x -I /root/onvif/gsoap-2.8/gsoap/import -I /root/onvif/gsoap-2.8/gsoap/

4、ProbeMatches代码

这样就创建了基本的服务端和客户端的代码了，下面需要添加具体的代码了。

其中包括：

(1)创建组播用的udp socket，绑定组播地址为239.255.255.250，端口为3702，因为ws-discovery的组播地址和端口就是为239.255.255.250和3702

(2)在产生的Probe函数中添加ProbeMatches代码
首先是udp socket

int bind_server_udp1(int server_s)
{
struct sockaddr_in local_addr;
memset(&local_addr,0,sizeof(local_addr));
local_addr.sin_family = AF_INET;
local_addr.sin_addr.s_addr = htonl(INADDR_ANY);
local_addr.sin_port = htons(3702);
return bind(server_s,(struct sockaddr*)&local_addr,sizeof(local_addr));

}
static int create_server_socket_udp(void)
{
int server_udp;
unsigned char one = 1;
int sock_opt = 1;

//server_udp = socket(PF_INET, SOCK_DGRAM, 0);
server_udp = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (server_udp == -1) {
printf("unable to create socket\n");
}

/* reuse socket addr */
if ((setsockopt(server_udp, SOL_SOCKET, SO_REUSEADDR, (void *) &sock_opt,
sizeof (sock_opt))) == -1) {
printf("setsockopt\n");
}
if ((setsockopt(server_udp, IPPROTO_IP, IP_MULTICAST_LOOP,
&one, sizeof (unsigned char))) == -1) {
printf("setsockopt\n");
}

struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = inet_addr("239.255.255.250");
mreq.imr_interface.s_addr = htonl(INADDR_ANY);

if(setsockopt(server_udp,IPPROTO_IP,IP_ADD_MEMBERSHIP,&mreq,sizeof(mreq))==-1){
perror("memberchip error\n");
}

return server_udp;
}

需要注意几点：1/设置socket属性SO_REUSEADDR，2、设置socket属性IP_ADD_MEMBERSHIP，目的是让3702的端口能够重复绑定，一家加入组播组。

其次是添加ProbeMatches代码
(1)首先复制client的soap_send___wsdd__ProbeMatches函数到服务端来，因为soap_send___wsdd__ProbeMatches已经写好了用于响应Probe消息的框架了，不用白不用啊。
(2)编写__wsdd__Probe函数，添加如下内容

int __wsdd__Probe(struct soap* soap, struct wsdd__ProbeType *wsdd__Probe)
{
DBG("__wsdd__Probe\n");
char macaddr[6];
char _IPAddr[INFO_LENGTH];
char _HwId[1024];

wsdd__ProbeMatchesType ProbeMatches;
ProbeMatches.ProbeMatch = (struct wsdd__ProbeMatchType *)soap_malloc(soap, sizeof(struct wsdd__ProbeMatchType));
ProbeMatches.ProbeMatch->XAddrs = (char *)soap_malloc(soap, sizeof(char) * INFO_LENGTH);
ProbeMatches.ProbeMatch->Types = (char *)soap_malloc(soap, sizeof(char) * INFO_LENGTH);
ProbeMatches.ProbeMatch->Scopes = (struct wsdd__ScopesType*)soap_malloc(soap,sizeof(struct wsdd__ScopesType));
ProbeMatches.ProbeMatch->wsa__EndpointReference.ReferenceProperties = (struct wsa__ReferencePropertiesType*)soap_malloc(soap,sizeof(struct wsa__ReferencePropertiesType));
ProbeMatches.ProbeMatch->wsa__EndpointReference.ReferenceParameters = (struct wsa__ReferenceParametersType*)soap_malloc(soap,sizeof(struct wsa__ReferenceParametersType));
ProbeMatches.ProbeMatch->wsa__EndpointReference.ServiceName = (struct wsa__ServiceNameType*)soap_malloc(soap,sizeof(struct wsa__ServiceNameType));
ProbeMatches.ProbeMatch->wsa__EndpointReference.PortType = (char **)soap_malloc(soap, sizeof(char *) * SMALL_INFO_LENGTH);
ProbeMatches.ProbeMatch->wsa__EndpointReference.__any = (char **)soap_malloc(soap, sizeof(char*) * SMALL_INFO_LENGTH);
ProbeMatches.ProbeMatch->wsa__EndpointReference.__anyAttribute = (char *)soap_malloc(soap, sizeof(char) * SMALL_INFO_LENGTH);
ProbeMatches.ProbeMatch->wsa__EndpointReference.Address = (char *)soap_malloc(soap, sizeof(char) * INFO_LENGTH);

macaddr[0]=0x01;macaddr[1]=0x01;macaddr[2]=0x01;macaddr[3]=0x01;macaddr[4]=0x01;macaddr[5]=0x01;
sprintf(_HwId,"urn:uuid:2419d68a-2dd2-21b2-a205-%02X%02X%02X%02X%02X%02X",macaddr[0], macaddr[1], macaddr[2], macaddr[3], macaddr[4], macaddr[5]);

sprintf(_IPAddr, "http://%03d.%03d.%1d.%03d/onvif/device_service", 192, 168, 1, 233);
ProbeMatches.__sizeProbeMatch = 1;
ProbeMatches.ProbeMatch->Scopes->__item =(char *)soap_malloc(soap, 1024);
memset(ProbeMatches.ProbeMatch->Scopes->__item,0,sizeof(ProbeMatches.ProbeMatch->Scopes->__item));

//Scopes MUST BE
strcat(ProbeMatches.ProbeMatch->Scopes->__item, "onvif://www.onvif.org/type/NetworkVideoTransmitter");

ProbeMatches.ProbeMatch->Scopes->MatchBy = NULL;
strcpy(ProbeMatches.ProbeMatch->XAddrs, _IPAddr);
strcpy(ProbeMatches.ProbeMatch->Types, wsdd__Probe->Types);
DBG("wsdd__Probe->Types=%s\n",wsdd__Probe->Types);
ProbeMatches.ProbeMatch->MetadataVersion = 1;
//ws-discovery规定为可选项
ProbeMatches.ProbeMatch->wsa__EndpointReference.ReferenceProperties->__size = 0;
ProbeMatches.ProbeMatch->wsa__EndpointReference.ReferenceProperties->__any = NULL;
ProbeMatches.ProbeMatch->wsa__EndpointReference.ReferenceParameters->__size = 0;
ProbeMatches.ProbeMatch->wsa__EndpointReference.ReferenceParameters->__any = NULL;

ProbeMatches.ProbeMatch->wsa__EndpointReference.PortType[0] = (char *)soap_malloc(soap, sizeof(char) * SMALL_INFO_LENGTH);
//ws-discovery规定为可选项
strcpy(ProbeMatches.ProbeMatch->wsa__EndpointReference.PortType[0], "ttl");
ProbeMatches.ProbeMatch->wsa__EndpointReference.ServiceName->__item = NULL;
ProbeMatches.ProbeMatch->wsa__EndpointReference.ServiceName->PortName = NULL;
ProbeMatches.ProbeMatch->wsa__EndpointReference.ServiceName->__anyAttribute = NULL;
ProbeMatches.ProbeMatch->wsa__EndpointReference.__any[0] = (char *)soap_malloc(soap, sizeof(char) * SMALL_INFO_LENGTH);
strcpy(ProbeMatches.ProbeMatch->wsa__EndpointReference.__any[0], "Any");
strcpy(ProbeMatches.ProbeMatch->wsa__EndpointReference.__anyAttribute, "Attribute");
ProbeMatches.ProbeMatch->wsa__EndpointReference.__size = 0;
strcpy(ProbeMatches.ProbeMatch->wsa__EndpointReference.Address, _HwId);

/*注释的部分为可选，注释掉onvif test也能发现ws-d*/
//soap->header->wsa__To = "http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous";
//soap->header->wsa__Action = "http://schemas.xmlsoap.org/ws/2005/04/discovery/ProbeMatches";
soap->header->wsa__RelatesTo = (struct wsa__Relationship*)soap_malloc(soap, sizeof(struct wsa__Relationship));
//it's here
soap->header->wsa__RelatesTo->__item = soap->header->wsa__MessageID;
soap->header->wsa__RelatesTo->RelationshipType = NULL;
soap->header->wsa__RelatesTo->__anyAttribute = NULL;

soap->header->wsa__MessageID =(char *)soap_malloc(soap, sizeof(char) * INFO_LENGTH);
strcpy(soap->header->wsa__MessageID,_HwId+4);

/* send over current socket as HTTP OK response: */
/*测试过，第二参数必须http，action随意*/
soap_send___wsdd__ProbeMatches(soap, "http://", NULL, &ProbeMatches);
return SOAP_OK;

}

想要写出上述代码，是一定要了解SOAP格式的，在WS-Discovery中描述了discovery所用的soap格式

1首先是了解消息头header和ProbeMatches中的内容，非常重要，可以参考这里http://www.w3.org/Submission/ws-addressing/ 最好详细的学习一下，里面的内容非常重要。

2其次需要理解的是，其实当你看完ws-addressing后你会发现，骨架代码中的结构体和SOAP消息中的内容是一一对应的，例如：

结构体osap->header对应SOAP消息的<SOAP-ENV:Header></SOAP-ENV:Header>中的内容，包含在header里的内容当然会包含在SOAP的header内。例如：

结构体soap->header->wsa__RelatesTo对应的是<wsa:RelatesTo></wsa:RelatesTo>。

3最后需要理解的是，在代码中的"__"双下划线一般对应xml中的命名空间的":"，下划线前是命名空间，后是具体内容。

4最后的最后是要详细的阅读ONVIF Core Specification

下图为响应OnvifTestTool的Probe命令的SOAP消息

结合上图再分析代码就亲切多了。在ONVIF Core Specification的7.3.2.2 Scopes 一节描述了onvif需要的Scopes，这个是需要在程序里填充，具体填充什么，文档里说的很明确：

注意点是在太多，随便漏掉一个都可能会导致搜不到设备，下图是非常重要的一个：

SOAP1.1和SOAP1.2所使用的SOAP-ENV是不同的，ONVIF使用的是SOAP1.1，如果soapcpp2产生的nsmap文件中的SOAP-ENV是SOAP1.2版本的话，那么OnvifTestTool是不会识别设备发出的SOAP消息的。

5、该main函数登场了

int main()
{
int server_udp;

int retval=0;
struct soap *soap_udp;
int fault_flag = 0;

server_udp = create_server_socket_udp();
bind_server_udp1(server_udp);
while(1){
soap_udp=soap_new();
soap_init1(soap_udp, SOAP_IO_UDP);
soap_udp->master = server_udp;
soap_udp->socket = server_udp;
soap_udp->errmode = 0;
soap_udp->bind_flags = 1;
if (!soap_valid_socket(soap_bind(soap_udp, NULL, 3702, 100)))
{
soap_print_fault(soap_udp, stderr);
}
fprintf(stderr,"soap_serve starting..\n");
retval = soap_serve(soap_udp); //阻塞在这里
fprintf(stderr,"retval=%d\n",retval);
if(retval && !(fault_flag))
{
fault_flag = 1;
}
else if(!retval)
{
fault_flag = 0;
}
soap_destroy(soap_udp);
soap_end(soap_udp);
soap_done(soap_udp);
free(soap_udp);
}
}

soap_server函数会一直阻塞，直到接收到SOAP消息，并且该处理是一次性的，所以要将将soap_server放到while里或者独立的线程中。
最后编译运行

make server

./discovery.tmp

单击OnvifTestTool的Discover Devices，运行discovery.tmp的中会打印调试信息，如图

然后，在OnvifTestTool中会搜索到我的设备

响应Discover Devices的SOAP消息如下：

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://www.w3.org/2003/05/soap-envelope"
xmlns:SOAP-ENC="http://www.w3.org/2003/05/soap-encoding"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/08/addressing"
xmlns:wsdd="http://schemas.xmlsoap.org/ws/2005/04/discovery"
xmlns:ns1="http://www.onvif.org/ver10/network/wsdl/RemoteDiscoveryBinding"
xmlns:ns2="http://www.onvif.org/ver10/network/wsdl/DiscoveryLookupBinding"
xmlns:ns3="http://www.onvif.org/ver10/network/wsdl/DiscoveryLookupBinding"
xmlns:tdn="http://www.onvif.org/ver10/network/wsdl">

<SOAP-ENV:Header>
<wsa:MessageID>uuid:2419d68a-2dd2-21b2-a205-010101010101</wsa:MessageID>
<wsa:RelatesTo>uuid:88a3958a-6155-4510-8279-69aeafd31681</wsa:RelatesTo>
<wsa:To SOAP-ENV:mustUnderstand="true">urn:schemas-xmlsoap-org:ws:2005:04:discovery</wsa:To>
<wsa:Action SOAP-ENV:mustUnderstand="true">http://schemas.xmlsoap.org/ws/2005/04/discovery/Probe</wsa:Action>
</SOAP-ENV:Header>

<SOAP-ENV:Body>
<wsdd:ProbeMatches>
<wsdd:ProbeMatch xmlns:_0="http://www.onvif.org/ver10/device/wsdl">
<wsa:EndpointReference>
<wsa:Address>urn:uuid:2419d68a-2dd2-21b2-a205-010101010101</wsa:Address>
<wsa:ReferenceProperties></wsa:ReferenceProperties>
<wsa:ReferenceParameters></wsa:ReferenceParameters>
<wsa:PortType>ttl</wsa:PortType>
</wsa:EndpointReference>
<wsdd:Types>_0:Device</wsdd:Types>
<wsdd:Scopes>onvif://www.onvif.org/type/NetworkVideoTransmitter</wsdd:Scopes>
<wsdd:XAddrs>http://192.168.1.233/onvif/device_service</wsdd:XAddrs>
<wsdd:MetadataVersion>1</wsdd:MetadataVersion>
</wsdd:ProbeMatch>
</wsdd:ProbeMatches>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>

资料下载

上述完整的代码包在这里，有需要的就去下载吧：http://download.csdn.net/detail/ghostyu/4766025