通过isapi协议抓拍图片

PC端通过isapi协议抓拍摄像头图片

说明：
1、isapi协议类似于http协议
2、通过isapi协议抓拍图片要经过这几个步骤
2.1、先创建socket，再连接服务器（也就是摄像机）connect
2.2、发送没有认证得请求send
2.3、服务器响应401，根据www-Authenticate返回来得属性值，生成摘要认证
2.4、再次发送带有认证得请求
2.5、服务器响应400。

**以下是实现得代码：
tcpclient.cpp

#ifndef WINDOWS
#define WINDOWS
#endif#ifdef WINDOWS
#include<WINSOCK2.H>
#include <WS2tcpip.h>
#else
#include <iconv.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#endif #ifdef WINDOWS
#pragma warning(disable:4996)
#pragma comment(lib, "WS2_32.lib")
#endif #include <errno.h>
#include <string.h>
#include "httpauth.h"char * url = (char*)"/ISAPI/Streaming/channels/101/picture";
char * cmd = (char*)"GET";
const char * username_t = "admin";
const char * passworld_t = "znrt8899";
const char * realm_t = "DS-2CD7A27EWD-IZS";
const char * nonce_t = "4d6a46444d7a5a464e3045364e5449355a546c695932553d";
const char * nc_t = "00000001";
const char * cnonce_t = "8887920ea7e5c1c8";
const char * response_t = "5a9aa58fb654e667ad9d8e8adaa336df";
const char * qop_t = "auth";FILE *fp = NULL;void initialization();
int main(int argc, char * argv[])
{int sd, ret;char rcv_buf[1024*1024] = {0};struct sockaddr_in ser_sockaddr;int cnt = 0;httpauth_t auth;initialization();while (1){//返回套接字描述符sd = socket(AF_INET, SOCK_STREAM, 0); //创建socket连接 选择IPV4的TCP协议数据包if (sd == -1){printf("TCP套接字创建失败\r\n");}//设置sockaddr_in结构体中相关参数ser_sockaddr.sin_family = AF_INET;                                        //地址族 IPV4ser_sockaddr.sin_port = htons(80);                                        //设置为要连接的服务器的端口号(short数据转化为网络数据)ser_sockaddr.sin_addr.s_addr = inet_addr("192.168.0.200");                //设置服务器的IP地址(字符串转化为整形)ret = connect(sd, (struct sockaddr *)&ser_sockaddr, sizeof(ser_sockaddr));//连接服务器if (ret == -1){printf("连接服务器失败\r\n");return -1;}printf("连接服务器成功\r\n");//struct timeval timeout = { 10, 0 };if (cnt == 0) {httpauth_set_auth(&auth, username_t, passworld_t, realm_t, nonce_t, nc_t, cnonce_t, response_t, qop_t);request(sd, &auth, 0);recv(sd, rcv_buf, 1024, 0);printf("%s\r\n", rcv_buf);prase_response(rcv_buf, &auth);}else {int rs = 1;int buflen = 0;int rev_pos = 0;int len;int jpeg_len;httpauth_get_response(&auth, cmd, url);memset(rcv_buf, 0, 1024);request(sd, &auth, 1);Sleep(1);len = sizeof(rcv_buf);while (rs){buflen = recv(sd, &rcv_buf[rev_pos], len - rev_pos, 0);printf("%s\r\n", rcv_buf);printf("buflen is %d \r\n", buflen);printf("rcv_buf is %d \r\n", sizeof(rcv_buf));if (buflen < 0){// 由于是非阻塞的模式,所以当buflen为EAGAIN时,表示当前缓冲区已无数据可读// 在这里就当作是该次事件已处理if (errno == EINTR)continue;elsebreak;}else if (buflen == 0){// 这里表示对端的socket已正常关闭.char *begin = NULL;begin = strstr(rcv_buf, "Content-Length:");jpeg_len = atoi(begin + 15);begin = strstr(rcv_buf, "\r\n\r\n");fp = fopen("./pic.JPEG", "wb");fwrite(begin + 4, jpeg_len, 1, fp);}if (buflen != 0)rs = 1;elsers = 0;rev_pos += buflen;}return 0;}closesocket(sd);cnt++;}return 0;
}
void initialization() {//初始化套接字库WORD w_req = MAKEWORD(2, 2);//版本号WSADATA wsadata;int err;err = WSAStartup(w_req, &wsadata);if (err != 0) {printf("初始化套接字库失败！");}else {printf("初始化套接字库成功！");}//检测版本号if (LOBYTE(wsadata.wVersion) != 2 || HIBYTE(wsadata.wHighVersion) != 2) {printf("套接字库版本号不符！");WSACleanup();}else {printf("套接字库版本正确！");}}

httpauth.h

#pragma once
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#define ISspace(x) isspace((int)(x))
#define USERLEN 33
#define REALMLEN 64
#define QOPLEN   32
typedef struct httpauth_t {char username[USERLEN], password[USERLEN];char qop[QOPLEN], realm[QOPLEN], nc[QOPLEN];char cnonce[REALMLEN], response[REALMLEN], nonce[REALMLEN];
}httpauth_t;void to_hex(char *in, int len, unsigned char *out);
void md5(const uint8_t *initial_msg, size_t initial_len, uint8_t *digest);int httpauth_set_auth(httpauth_t *auth, const char* username, const char* password, const char* realm, const char* nonce, const char* nc, const char* cnonce, const char* response, const char* qop);
int httpauth_get_response(httpauth_t *auth, char *cmd, char *url);
void request(int socket_fd, httpauth_t *auth, int flag);
int prase_response(char * response_buf, httpauth_t *auth);

httpauth.cpp

#include "httpauth.h"#ifndef WINDOWS
#define WINDOWS
#endif#ifdef WINDOWS
#include<WINSOCK2.H>
#include <WS2tcpip.h>
#else
#include <iconv.h>
#include <netinet/in.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>#endif // WINDOWS#ifdef WINDOWS
#pragma warning(disable:4996)
#pragma comment(lib, "WS2_32.lib")
#endif // WINDOWS
const uint32_t k[64] = {0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee ,0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501 ,0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be ,0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821 ,0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa ,0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8 ,0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed ,0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a ,0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c ,0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70 ,0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05 ,0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665 ,0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039 ,0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1 ,0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1 ,0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 };// r specifies the per-round shift amounts
const uint32_t r[] = {7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,5,  9, 14, 20, 5,  9, 14, 20, 5,  9, 14, 20, 5,  9, 14, 20,4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21
};// leftrotate function definition
#define LEFTROTATE(x, c) (((x) << (c)) | ((x) >> (32 - (c))))void to_bytes(uint32_t val, uint8_t *bytes)
{bytes[0] = (uint8_t)val;bytes[1] = (uint8_t)(val >> 8);bytes[2] = (uint8_t)(val >> 16);bytes[3] = (uint8_t)(val >> 24);
}uint32_t to_int32(const uint8_t *bytes)
{return (uint32_t)bytes[0]| ((uint32_t)bytes[1] << 8)| ((uint32_t)bytes[2] << 16)| ((uint32_t)bytes[3] << 24);
}void md5(const uint8_t *initial_msg, size_t initial_len, uint8_t *digest) {// These vars will contain the hashuint32_t h0, h1, h2, h3;// Message (to prepare)uint8_t *msg = NULL;size_t new_len, offset;uint32_t w[16];uint32_t a, b, c, d, i, f, g, temp;// Initialize variables - simple count in nibbles:h0 = 0x67452301;h1 = 0xefcdab89;h2 = 0x98badcfe;h3 = 0x10325476;//Pre-processing://append "1" bit to message    //append "0" bits until message length in bits � 448 (mod 512)//append length mod (2^64) to messagefor (new_len = initial_len + 1; new_len % (512 / 8) != 448 / 8; new_len++);msg = (uint8_t*)malloc(new_len + 8);memcpy(msg, initial_msg, initial_len);msg[initial_len] = 0x80; // append the "1" bit; most significant bit is "first"for (offset = initial_len + 1; offset < new_len; offset++)msg[offset] = 0; // append "0" bits// append the len in bits at the end of the buffer.to_bytes(initial_len * 8, msg + new_len);// initial_len>>29 == initial_len*8>>32, but avoids overflow.to_bytes(initial_len >> 29, msg + new_len + 4);// Process the message in successive 512-bit chunks://for each 512-bit chunk of message:for (offset = 0; offset < new_len; offset += (512 / 8)) {// break chunk into sixteen 32-bit words w[j], 0 � j � 15for (i = 0; i < 16; i++)w[i] = to_int32(msg + offset + i * 4);// Initialize hash value for this chunk:a = h0;b = h1;c = h2;d = h3;// Main loop:for (i = 0; i < 64; i++) {if (i < 16) {f = (b & c) | ((~b) & d);g = i;}else if (i < 32) {f = (d & b) | ((~d) & c);g = (5 * i + 1) % 16;}else if (i < 48) {f = b ^ c ^ d;g = (3 * i + 5) % 16;}else {f = c ^ (b | (~d));g = (7 * i) % 16;}temp = d;d = c;c = b;b = b + LEFTROTATE((a + f + k[i] + w[g]), r[i]);a = temp;}// Add this chunk's hash to result so far:h0 += a;h1 += b;h2 += c;h3 += d;}// cleanupfree(msg);//var char digest[16] := h0 append h1 append h2 append h3 //(Output is in little-endian)to_bytes(h0, digest);to_bytes(h1, digest + 4);to_bytes(h2, digest + 8);to_bytes(h3, digest + 12);
}void to_hex(char *in, int len, unsigned char *out)
{static char const hex[] = "0123456789abcdef";unsigned i;memset(out, 0, len * 2 + 1);for (i = 0;i < len;i++){out[2 * i] = hex[(in[i] >> 4) & 0x0F];out[2 * i + 1] = hex[(in[i] & 0x0F)];//printf("%d#%2.2x##%2.2x###%2.2x\n",i,in[i],out[2*i],out[2*i+1]);}
}int httpauth_set_auth(httpauth_t *auth, const char* username, const char* password, const char* realm, const char* nonce, const char* nc, const char* cnonce, const char* response, const char* qop)
{strcpy(auth->username, username);strcpy(auth->password, password);strcpy(auth->realm, realm);strcpy(auth->nonce, nonce);strcpy(auth->nc, nc);strcpy(auth->cnonce, cnonce);strcpy(auth->response, response);strcpy(auth->qop, qop);return 0;
}int httpauth_get_response(httpauth_t *auth, char *cmd, char *url)
{uint8_t strH1[512], strH2[512];uint8_t md5_h1[33], md5_h2[33];uint8_t result[16], result2[16];size_t len;//md5(md5(<username>:<realm>:<password>):<nonce>:md5(<cmd>:<url>))memset(strH1, 0, 512);sprintf((char*)strH1, "%s:%s:%s", auth->username, auth->realm, auth->password);len = strlen((char*)strH1);md5(strH1, len, result);to_hex((char*)result, 16, md5_h1);memset(strH2, 0, 512);sprintf((char*)strH2, "%s:%s", cmd, url);len = strlen((char*)strH2);md5(strH2, len, result2);to_hex((char*)result2, 16, md5_h2);memset(strH1, 0, 512);sprintf((char*)strH1, "%s:%s:%s:%s:%s:%s", md5_h1, auth->nonce, auth->nc, auth->cnonce, auth->qop, md5_h2);//    printf("response %s\r\n",strH1);len = strlen((char*)strH1);md5(strH1, len, result);to_hex((char*)result, 16, (unsigned char *)auth->response);//  printf("response = %s\r\n",auth->response);return 0;
}/**********************************************************************/
/* send a no authentication request */
/**********************************************************************/
void request(int socket_fd, httpauth_t *auth, int flag)
{char buf[2048];int pos = 0;pos = sprintf(&buf[pos], "GET /ISAPI/Streaming/channels/101/picture HTTP/1.1\r\n");pos += sprintf(&buf[pos], "Host:192.168.0.200\r\n");pos += sprintf(&buf[pos], "Connection: keep-alive\r\n");pos += sprintf(&buf[pos], "Cache-Control: max-age=0\r\n");if (1 == flag){pos += sprintf(&buf[pos], "Authorization: Digest username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"/ISAPI/Streaming/channels/101/picture\", response=\"%s\", qop=auth, nc=00000001, cnonce=\"%s\"\r\n", auth->username, auth->realm, auth->nonce, auth->response, auth->cnonce);}pos += sprintf(&buf[pos], "Upgrade-Insecure-Requests: 1\r\n");pos += sprintf(&buf[pos], "User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.105 Safari/537.36\r\n");pos += sprintf(&buf[pos], "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8\r\n");pos += sprintf(&buf[pos], "Accept-Encoding: gzip, deflate, sdch\r\n");pos += sprintf(&buf[pos], "Accept-Language: zh-CN,zh;q=0.9\r\n");pos += sprintf(&buf[pos], "Cookie: language=zh\r\n");pos += sprintf(&buf[pos], "\r\n");printf("%s\r\n", buf);int len = send(socket_fd, buf, strlen(buf), 0);printf("发送长度是%d", len);}/**********************************************************************
int prase_response(char * response_buf )
**********************************************************************/int prase_response(char * response_buf, httpauth_t *auth)
{char * begin = NULL, *end = NULL;if (strstr(response_buf, "401") != NULL){begin = strstr(response_buf, "\"");end = strstr(begin + 1, "\"");memcpy(auth->qop, begin + 1, end - begin - 1);auth->qop[end - begin - 1] = 0;begin = strstr(end + 1, "\"");end = strstr(begin + 1, "\"");memcpy(auth->realm, begin + 1, end - begin - 1);auth->realm[end - begin - 1] = 0;begin = strstr(end + 1, "\"");end = strstr(begin + 1, "\"");memcpy(auth->nonce, begin + 1, end - begin - 1);memcpy(auth->cnonce, auth->nonce, 16);}else if (strstr(response_buf, "200") != NULL)printf("the servers return 200 ok\r\n");return 0;}

程序源码百分之九十来自这里 github ：https://github.com/kyhkl/hivisoion_projcet.git

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