From 022d1a768b1ebf3f37ea79c6ac678d3870edba5f Mon Sep 17 00:00:00 2001 From: SASANO Takayoshi Date: Fri, 27 Mar 2020 06:25:54 +0900 Subject: [PATCH] add IPv6 support (code from DAPNETGateway-IPv6) --- UDPSocket.cpp | 115 ++++++++++++++++++-------------------------------- UDPSocket.h | 9 ++-- 2 files changed, 47 insertions(+), 77 deletions(-) diff --git a/UDPSocket.cpp b/UDPSocket.cpp index ba0e35f..7899601 100644 --- a/UDPSocket.cpp +++ b/UDPSocket.cpp @@ -60,49 +60,46 @@ CUDPSocket::~CUDPSocket() #endif } -in_addr CUDPSocket::lookup(const std::string& hostname) +int CUDPSocket::lookup(const std::string& hostname, unsigned int port, sockaddr_storage &addr, unsigned int &address_length) { - in_addr addr; -#if defined(_WIN32) || defined(_WIN64) - unsigned long address = ::inet_addr(hostname.c_str()); - if (address != INADDR_NONE && address != INADDR_ANY) { - addr.s_addr = address; - return addr; + int err; + std::string portstr = std::to_string(port); + struct addrinfo hints, *res; + + ::memset(&hints, 0, sizeof(struct addrinfo)); + hints.ai_flags = AI_NUMERICSERV; + + err = getaddrinfo(hostname.c_str(), portstr.c_str(), &hints, &res); + if (err) { + sockaddr_in *paddr = (sockaddr_in *)&addr; + ::memset(paddr, 0, address_length = sizeof(sockaddr_in)); + paddr->sin_family = AF_INET; + paddr->sin_port = htons(port); + paddr->sin_addr.s_addr = htonl(INADDR_NONE); + LogError("Cannot find address for host %s", hostname.c_str()); + return err; } - struct hostent* hp = ::gethostbyname(hostname.c_str()); - if (hp != NULL) { - ::memcpy(&addr, hp->h_addr_list[0], sizeof(struct in_addr)); - return addr; - } + ::memcpy(&addr, res->ai_addr, address_length = res->ai_addrlen); - LogError("Cannot find address for host %s", hostname.c_str()); - - addr.s_addr = INADDR_NONE; - return addr; -#else - in_addr_t address = ::inet_addr(hostname.c_str()); - if (address != in_addr_t(-1)) { - addr.s_addr = address; - return addr; - } - - struct hostent* hp = ::gethostbyname(hostname.c_str()); - if (hp != NULL) { - ::memcpy(&addr, hp->h_addr_list[0], sizeof(struct in_addr)); - return addr; - } - - LogError("Cannot find address for host %s", hostname.c_str()); - - addr.s_addr = INADDR_NONE; - return addr; -#endif + freeaddrinfo(res); + return 0; } bool CUDPSocket::open() { - m_fd = ::socket(PF_INET, SOCK_DGRAM, 0); + int err; + sockaddr_storage addr; + unsigned int addrlen; + + /* to determine protocol family, call lookup() first. */ + err = lookup(m_address.empty() ? "0.0.0.0" : m_address.c_str(), m_port, addr, addrlen); + if (err) { + LogError("The local address is invalid - %s", m_address.c_str()); + return false; + } + + m_fd = ::socket(addr.ss_family, SOCK_DGRAM, 0); if (m_fd < 0) { #if defined(_WIN32) || defined(_WIN64) LogError("Cannot create the UDP socket, err: %lu", ::GetLastError()); @@ -113,24 +110,6 @@ bool CUDPSocket::open() } if (m_port > 0U) { - sockaddr_in addr; - ::memset(&addr, 0x00, sizeof(sockaddr_in)); - addr.sin_family = AF_INET; - addr.sin_port = htons(m_port); - addr.sin_addr.s_addr = htonl(INADDR_ANY); - - if (!m_address.empty()) { -#if defined(_WIN32) || defined(_WIN64) - addr.sin_addr.s_addr = ::inet_addr(m_address.c_str()); -#else - addr.sin_addr.s_addr = ::inet_addr(m_address.c_str()); -#endif - if (addr.sin_addr.s_addr == INADDR_NONE) { - LogError("The local address is invalid - %s", m_address.c_str()); - return false; - } - } - int reuse = 1; if (::setsockopt(m_fd, SOL_SOCKET, SO_REUSEADDR, (char *)&reuse, sizeof(reuse)) == -1) { #if defined(_WIN32) || defined(_WIN64) @@ -141,7 +120,7 @@ bool CUDPSocket::open() return false; } - if (::bind(m_fd, (sockaddr*)&addr, sizeof(sockaddr_in)) == -1) { + if (::bind(m_fd, (sockaddr*)&addr, addrlen) == -1) { #if defined(_WIN32) || defined(_WIN64) LogError("Cannot bind the UDP address, err: %lu", ::GetLastError()); #else @@ -154,7 +133,7 @@ bool CUDPSocket::open() return true; } -int CUDPSocket::read(unsigned char* buffer, unsigned int length, in_addr& address, unsigned int& port) +int CUDPSocket::read(unsigned char* buffer, unsigned int length, sockaddr_storage& address, unsigned int &address_length) { assert(buffer != NULL); assert(length > 0U); @@ -186,17 +165,16 @@ int CUDPSocket::read(unsigned char* buffer, unsigned int length, in_addr& addres if (ret == 0) return 0; - sockaddr_in addr; #if defined(_WIN32) || defined(_WIN64) - int size = sizeof(sockaddr_in); + int size = sizeof(sockaddr_storage); #else - socklen_t size = sizeof(sockaddr_in); + socklen_t size = sizeof(sockaddr_storage); #endif #if defined(_WIN32) || defined(_WIN64) - int len = ::recvfrom(m_fd, (char*)buffer, length, 0, (sockaddr *)&addr, &size); + int len = ::recvfrom(m_fd, (char*)buffer, length, 0, (sockaddr *)&address, &size); #else - ssize_t len = ::recvfrom(m_fd, (char*)buffer, length, 0, (sockaddr *)&addr, &size); + ssize_t len = ::recvfrom(m_fd, (char*)buffer, length, 0, (sockaddr *)&address, &size); #endif if (len <= 0) { #if defined(_WIN32) || defined(_WIN64) @@ -207,28 +185,19 @@ int CUDPSocket::read(unsigned char* buffer, unsigned int length, in_addr& addres return -1; } - address = addr.sin_addr; - port = ntohs(addr.sin_port); - + address_length = size; return len; } -bool CUDPSocket::write(const unsigned char* buffer, unsigned int length, const in_addr& address, unsigned int port) +bool CUDPSocket::write(const unsigned char* buffer, unsigned int length, const sockaddr_storage& address, unsigned int address_length) { assert(buffer != NULL); assert(length > 0U); - sockaddr_in addr; - ::memset(&addr, 0x00, sizeof(sockaddr_in)); - - addr.sin_family = AF_INET; - addr.sin_addr = address; - addr.sin_port = htons(port); - #if defined(_WIN32) || defined(_WIN64) - int ret = ::sendto(m_fd, (char *)buffer, length, 0, (sockaddr *)&addr, sizeof(sockaddr_in)); + int ret = ::sendto(m_fd, (char *)buffer, length, 0, (sockaddr *)&address, address_length); #else - ssize_t ret = ::sendto(m_fd, (char *)buffer, length, 0, (sockaddr *)&addr, sizeof(sockaddr_in)); + ssize_t ret = ::sendto(m_fd, (char *)buffer, length, 0, (sockaddr *)&address, address_length); #endif if (ret < 0) { #if defined(_WIN32) || defined(_WIN64) diff --git a/UDPSocket.h b/UDPSocket.h index e0af272..ec5de9c 100644 --- a/UDPSocket.h +++ b/UDPSocket.h @@ -31,7 +31,8 @@ #include #include #else -#include +#include +#include #endif class CUDPSocket { @@ -42,12 +43,12 @@ public: bool open(); - int read(unsigned char* buffer, unsigned int length, in_addr& address, unsigned int& port); - bool write(const unsigned char* buffer, unsigned int length, const in_addr& address, unsigned int port); + int read(unsigned char* buffer, unsigned int length, sockaddr_storage& address, unsigned int &address_length); + bool write(const unsigned char* buffer, unsigned int length, const sockaddr_storage& address, unsigned int address_length); void close(); - static in_addr lookup(const std::string& hostName); + static int lookup(const std::string& hostName, unsigned int port, sockaddr_storage &address, unsigned int &address_length); private: std::string m_address;