Linux下onvif客户端关于ipc摄像头的搜索

设备搜索：要访问一个IPC摄像头，或者说要调用IPC摄像头提供的WEB服务接口，就要先知道其IP地址，这就是设备发现的过程，或者叫设备搜索的过程。IPC摄像头用的是239.255.255.250（端口3702），所以设备搜索的原理是，只要在设备上服务器监听239.255.255.250的3702端口。ONVIF规范并没有自己定义服务设备发现框架，而是复用了已经很成熟的WS-Discovery标准，根据.wsdl的文件，用gsoap产生框架代码，调用其产生的函数接口去实现设备的搜索。

1、gsoap框架代码：https://blog.csdn.net/weixin_42432281/article/details/84818575

2、上一部如果完成，就直接略过，将安装的gsoap-2.8gsoap目录下的两个文件：stdsoap2.c、stdsoap2.h拷贝到你工作目录下

3、注释stdsoap2.c如下代码：不注释的话会在编译运行的时候产生log日志，最后会发现磁盘已满的现象。

/*

#ifdef SOAP_DEBUG

#ifdef TANDEM_NONSTOP

soap_set_test_logfile(soap, "TESTLOG");

soap_set_sent_logfile(soap, "SENTLOG");

soap_set_recv_logfile(soap, "RECVLOG");

#else

soap_set_test_logfile(soap, "TEST.log");

soap_set_sent_logfile(soap, "SENT.log");

soap_set_recv_logfile(soap, "RECV.log");

#endif

#endif

*/

和修改

if (/*s == r || *r || */n < -128 || n > 127)

4、将安装的gsoap2.8目录下的import目录，拷贝到生成.c、.h的工作的文件夹里，cp gsoap-2.8/gsoap/import ./  ,REAMOD.txt是我写的记录文档，不必在意，其他的文件都拷贝到这个目录下

5、设备搜索的代码：我是直接copy别人的代码，做了一下修改（https://blog.csdn.net/saloon_yuan/article/details/27524875）

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#include "soapH.h"
#include "stdsoap2.h"
#include "soapStub.h"
 
#include "wsdd.nsmap" //命名空间
 
 
static struct soap* ONVIF_Initsoap(struct SOAP_ENV__Header *header, const char *was_To, const char *was_Action, int timeout)
{
    struct soap *soap = NULL;    // soap环境变量
    unsigned char macaddr[6];
    char _HwId[1024];
    unsigned int Flagrand;
 
    soap = soap_new();
    if(soap == NULL)
    {
        printf("[%d]soap = NULL
", __LINE__);
        return NULL;
    }
 
    soap_set_namespaces(soap, namespaces);   // 设置soap的namespaces，即设置命名空间
 
    // 设置超时（超过指定时间没有数据就退出）
    if(timeout > 0)
    {
        soap->recv_timeout = timeout;
        soap->send_timeout = timeout;
        soap->connect_timeout = timeout;
    }
    else
    {
        //Maximum waittime : 20s
        soap->recv_timeout  = 20;
        soap->send_timeout  = 20;
        soap->connect_timeout = 20;
    }
 
    soap_default_SOAP_ENV__Header(soap, header);
 
    //Create SessionID randomly,生成uuid(windows下叫guid，linux下叫uuid)，格式为urn:uuid:8-4-4-4-12，由系统随机产生
    srand((int)time(0));
    Flagrand = rand()%9000 + 8888;
    macaddr[0] = 0x1;
    macaddr[1] = 0x2;
    macaddr[2] = 0x3;
    macaddr[3] = 0x4;
    macaddr[4] = 0x5;
    macaddr[5] = 0x6;
    sprintf(_HwId, "urn:uuid:%ud68a-1dd2-11b2-a105-%02X%02X%02X%02X%02X%02X", Flagrand, macaddr[0], macaddr[1], macaddr[2],macaddr[3],macaddr[4],macaddr[5]);
    header->wsa__MessageID = (char *)malloc(100);  
    memset(header->wsa__MessageID, 0, 100);
    strncpy(header->wsa__MessageID, _HwId, strlen(_HwId));    //wsa__MessageID存放的是uuid
 
    if(was_Action != NULL)
    {
        header->wsa__Action = (char*)malloc(1024);
        memset(header->wsa__Action, '', 1024);
        strncpy(header->wsa__Action, was_Action, 1024); //
    }
    if(was_To != NULL)
    {
        header->wsa__To = (char *)malloc(1024);
        memset(header->wsa__To, '', 1024);
        strncpy(header->wsa__To, was_To, 1024);//"urn:schemas-xmlsoap-org:ws:2005:04:discovery";
    }
    soap->header = header;
    return soap;
}
 
 
//释放函数
void ONVIF_soap_delete(struct soap *soap)
{
    soap_destroy(soap);                                                         // remove deserialized class instances (C++ only)
    soap_end(soap);                                                             // Clean up deserialized data (except class instances) and temporary data
    soap_free(soap);                                                            // Reset and deallocate the context created with soap_new or soap_copy
}
 
 
int ONVIF_ClientDiscovery()
{
    int FoundDevNo = 0; 
    int retval = SOAP_OK;
    wsdd__ProbeType req;    // 用于发送Probe消息
    struct __wsdd__ProbeMatches resp;   // 用于接收Probe应答
    wsdd__ScopesType sScope;
    struct SOAP_ENV__Header header;
    struct soap* soap;
 
    const char *was_To = "urn:schemas-xmlsoap-org:ws:2005:04:discovery";
    const char *was_Action = "http://schemas.xmlsoap.org/ws/2005/04/discovery/Probe";
 
    //IP Adress and PortNo, broadCast
    const char *soap_endpoint = "soap.udp://239.255.255.250:3702/"; //设备上服务器监听239.255.255.250的3702端口
 
    //Create new soap object with info
    soap = ONVIF_Initsoap(&header, was_To, was_Action, 10);
 
    soap_default_SOAP_ENV__Header(soap, &header);
    soap->header = &header;
 
    soap_default_wsdd__ScopesType(soap, &sScope);  // 设置寻找设备的范围
    sScope.__item = NULL;
    soap_default_wsdd__ProbeType(soap, &req);  // 设置寻找设备的类型
    req.Scopes = &sScope;
    req.Types = NULL; //"dn:NetworkVideoTransmitter";
 
    //sent the message broadcast and wait
    retval = soap_send___wsdd__Probe(soap, soap_endpoint, NULL, &req);   // 向组播地址广播Probe消息
 
    while(retval == SOAP_OK)
    {
        printf("**************1**************
");
        retval = soap_recv___wsdd__ProbeMatches(soap, &resp);
        if(retval == SOAP_OK)
        {
            if(soap->error)
            {
                printf("[%d]:recv soap error :%d, %s, %s
", __LINE__, soap->error, *soap_faultcode(soap), *soap_faultstring(soap));
                retval = soap->error;
            }
            else //we find a device
            {
                FoundDevNo++;
                if(resp.wsdd__ProbeMatches->ProbeMatch != NULL && resp.wsdd__ProbeMatches->ProbeMatch->XAddrs != NULL)
                {
                    printf("***** No %d Devices Information *****
", FoundDevNo);
                    printf("Device Service Address : %s
", resp.wsdd__ProbeMatches->ProbeMatch->XAddrs);
                    printf("Device EP Address      : %s
", resp.wsdd__ProbeMatches->ProbeMatch->wsa__EndpointReference.Address);
                    printf("Device Type            : %s
", resp.wsdd__ProbeMatches->ProbeMatch->Types);
                    printf("Device Metadata Version: %d
", resp.wsdd__ProbeMatches->ProbeMatch->MetadataVersion);
 
 
                    printf("[%d]*********************************
", __LINE__);
                }
 
            }
        }
        else if(soap->error)
        {
            if(FoundDevNo == 0)
            {
                printf("No Device found!
");
                retval = soap->error;
            }
            else
            {
                printf("Search end! Find %d Device! 
", FoundDevNo);
                retval = 0;
            }
            break;
        }
    }
 
    //释放函数
    ONVIF_soap_delete(soap);
    return retval;
}
 
int main(int argc, char *argv[])
{
    if(ONVIF_ClientDiscovery() != 0)
    {
        printf("discover failed! 
");
        return -1;
    }
    return 0;
}

6、在编译时如果出现：对‘namespaces’未定义的引用，那是你在程序中没有加 #include "wsdd.nsmap" ，这个头文件，加上即可。

7、编译，生成可执行文件test：gcc -o test search_test.c  stdsoap2.c  soapC.c  soapClient.c -I import/

8、运行test： ./test

设备搜索已完成！

设备搜索的主要目的是获取他服务器的地址：http://172.168.0.216/onvif/device_service，为下一步获取能力做准备。