支持ipV4和ipV6的客戶端編程
阿新 • • 發佈:2018-01-13
sin 一個 zip eof its urn 連接 初始 動態庫
ipv4和ipv6在socket初始化的時候是不一樣的。
ipv4 socket初始化:
int CClient::InitSocket(CString strIP, short portNum) { WSADATA wsd; //WSADATA變量 SOCKADDR_IN servAddr; //服務器地址 int retVal; //返回值 int nServAddlen; //初始化套結字動態庫 if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0) { return-1; } sprintf_s(m_szIP, sizeof(m_szIP), strIP); memset(&servAddr, 0, sizeof(servAddr)); //創建套接字 m_sHost = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (INVALID_SOCKET == m_sHost) { WSACleanup();//釋放套接字資源 return -1; } //設置服務器地址 servAddr.sin_family = AF_INET; servAddr.sin_addr.s_addr= inet_addr(m_szIP); servAddr.sin_port = htons(portNum); nServAddlen = sizeof(servAddr); //連接服務器 retVal = connect(m_sHost, (LPSOCKADDR)&servAddr, (socklen_t)nServAddlen); if (SOCKET_ERROR == retVal) { closesocket(m_sHost); //關閉套接字 WSACleanup(); //釋放套接字資源 return-1; } return 0; }
ipv6 socket初始化:
int CClient::InitSocket(CString strIP, short portNum) { WSADATA wsd; //WSADATA變量 struct sockaddr_in6 servAddr_in6; //服務器地址 int retVal; //返回值 int nServAddlen; //初始化套結字動態庫 if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0) { return -1; } sprintf_s(m_szIP, sizeof(m_szIP), strIP); memset(&servAddr_in6, 0, sizeof(struct sockaddr_in6)); //創建套接字 m_sHost = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP); if (INVALID_SOCKET == m_sHost) { return -1; } //設置服務器地址 servAddr_in6.sin6_family = AF_INET6; if (!inet_pton(AF_INET6, m_szIP, &servAddr_in6.sin6_addr.s6_addr)) { closesocket(m_sHost); //關閉套接字 WSACleanup(); //釋放套接字資源 return -1; } servAddr_in6.sin6_port = htons(portNum); nServAddlen = sizeof(servAddr_in6); //連接服務器 retVal = connect(m_sHost, (LPSOCKADDR)&servAddr_in6, (socklen_t)nServAddlen); if (SOCKET_ERROR == retVal) { closesocket(m_sHost); //關閉套接字 WSACleanup(); //釋放套接字資源 return -1; } //退出 return 0; }
將上面的邏輯合二為一:
int CClient::InitSocket(CString strIP, short portNum) { WSADATA wsd; //WSADATA變量 struct sockaddr_in6 servAddr_in6; //服務器地址 SOCKADDR_IN servAddr; //服務器地址 int retVal; //返回值 int nServAddlen; //初始化套結字動態庫 if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0) { return -1; } sprintf_s(m_szIP, sizeof(m_szIP), strIP); memset(&servAddr, 0, sizeof(servAddr)); memset(&servAddr_in6, 0, sizeof(struct sockaddr_in6)); if (TRUE == is_string_ipaddr_ipv4(m_szIP, &servAddr.sin_addr)) { //創建套接字 m_sHost = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (INVALID_SOCKET == m_sHost) { WSACleanup();//釋放套接字資源 return -1; } //設置服務器地址 servAddr.sin_family = AF_INET; servAddr.sin_addr.s_addr = inet_addr(m_szIP); servAddr.sin_port = htons(portNum); nServAddlen = sizeof(servAddr); //連接服務器 retVal = connect(m_sHost, (LPSOCKADDR)&servAddr, (socklen_t)nServAddlen); } else { //創建套接字 m_sHost = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP); if (INVALID_SOCKET == m_sHost) { return -1; } //設置服務器地址 servAddr_in6.sin6_family = AF_INET6; if (!inet_pton(AF_INET6, m_szIP, &servAddr_in6.sin6_addr.s6_addr)) { closesocket(m_sHost); //關閉套接字 WSACleanup(); //釋放套接字資源 return -1; } servAddr_in6.sin6_port = htons(portNum); nServAddlen = sizeof(servAddr_in6); //連接服務器 retVal = connect(m_sHost, (LPSOCKADDR)&servAddr_in6, (socklen_t)nServAddlen); } if (SOCKET_ERROR == retVal) { closesocket(m_sHost); //關閉套接字 WSACleanup(); //釋放套接字資源 return -1; } //退出 return 0; }
判斷一個ip是不是ipv4的
/*判斷傳入的字符串是否為ipv4格式的 */ bool CClient::is_string_ipaddr_ipv4(const char* str_ipv4, struct in_addr *ip) { int32 ret = -1; struct in_addr tmp_ip; memset(&tmp_ip, 0, sizeof(struct in_addr)); if (NULL == str_ipv4) { return false; } if (0 == *str_ipv4) { return false; } ret = inet_pton(AF_INET, str_ipv4, &tmp_ip); if (0 == ret) { return false; } else if (ret < 0) { return false; } else { if (NULL != ip) { memcpy(ip, (void *)&tmp_ip, sizeof(struct in_addr)); } return true; } }
支持ipV4和ipV6的客戶端編程