OpenHarmony之分布式软总线discovery/coap/source/coap_socket.c

coap_socket.c封装了服务端与客户端之间的socket操作

coap_socket.c封装了服务端与客户端之间的socket操作

// 通过传入的地址信息，创建UDP服务端
int CoapCreateUdpServer(const struct sockaddr_in *sockAddr)
{
    if (sockAddr == NULL) {
        return NSTACKX_EINVAL;
    }
    struct sockaddr_in localAddr;
    socklen_t len = sizeof(localAddr);
    //创建套接字
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        return NSTACKX_OVERFLOW;
    }
    (void)memset_s(&localAddr, sizeof(localAddr), 0, sizeof(localAddr));
    localAddr.sin_family = AF_INET;
    localAddr.sin_port = sockAddr->sin_port;
    if (sockAddr->sin_addr.s_addr != 0) {
        localAddr.sin_addr.s_addr = sockAddr->sin_addr.s_addr;
    } else {
        localAddr.sin_addr.s_addr = htonl(INADDR_ANY); //0.0.0.0
    }
    //绑定
    if (bind(sockfd, (struct sockaddr *)&localAddr, len) == -1) {
        CloseSocket(&sockfd);
        return NSTACKX_EFAILED;
    }
    //获取与套接字关联的本地协议地址
    if (getsockname(sockfd, (struct sockaddr *)&localAddr, &len) == -1) {
        CloseSocket(&sockfd);
        return NSTACKX_EFAILED;
    }
    return sockfd;
}

//创建客户端socket
int CoapCreateUdpClient(const struct sockaddr_in *sockAddr)
{
    if (sockAddr == NULL) {
        return NSTACKX_EFAILED;
    }
    struct sockaddr_in tmpAddr;
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        return NSTACKX_EFAILED;
    }
    int ret = connect(sockfd, (struct sockaddr *)sockAddr, sizeof(struct sockaddr));
    if (ret != 0) {
        CloseSocket(&sockfd);
        return NSTACKX_EFAILED;
    }
    socklen_t srcAddrLen = sizeof(struct sockaddr_in);
    (void)memset_s(&tmpAddr, sizeof(tmpAddr), 0, sizeof(tmpAddr));
    //获取与套接字关联的本地协议地址
    ret = getsockname(sockfd, (struct sockaddr *)&tmpAddr, &srcAddrLen);
    if (ret != 0) {
        CloseSocket(&sockfd);
        return NSTACKX_EFAILED;
    }
    //如果之前创建了，那么关闭之前的
    CloseSocket(&g_clientFd);
    g_clientFd = sockfd;
    return NSTACKX_EOK;
}
socket send/recevice

//socket send
int CoapSocketSend(const SocketInfo *socket, const uint8_t *buffer, size_t length)
{
    if (buffer == NULL || socket == NULL) {
        return NSTACKX_EFAILED;
    }
    //目的地址
    socklen_t dstAddrLen = sizeof(struct sockaddr_in);
    int ret = sendto(socket->cliendFd, buffer, length, 0, (struct sockaddr *)&socket->dstAddr, dstAddrLen);
    return ret;
}
// socket recevice
int CoapSocketRecv(int socketFd, uint8_t *buffer, size_t length)
{
    if (buffer == NULL || socketFd < 0) {
        return NSTACKX_EFAILED;
    }
    struct sockaddr_in addr;
    socklen_t len = sizeof(struct sockaddr_in);
    (void)memset_s(&addr, sizeof(addr), 0, sizeof(addr));
    int ret = recvfrom(socketFd, buffer, length, 0, (struct sockaddr *)&addr, &len);
    return ret;
}

DD一下：欢迎大家关注公众号<程序猿百晓生>，可以了解到以下知识点。

`欢迎大家关注公众号<程序猿百晓生>，可以了解到以下知识点。`
1.OpenHarmony开发基础
2.OpenHarmony北向开发环境搭建
3.鸿蒙南向开发环境的搭建
4.鸿蒙生态应用开发白皮书V2.0 & V3.0
5.鸿蒙开发面试真题（含参考答案） 
6.TypeScript入门学习手册
7.OpenHarmony 经典面试题(含参考答案)
8.OpenHarmony设备开发入门【最新版】
9.沉浸式剖析OpenHarmony源代码
10.系统定制指南
11.【OpenHarmony】Uboot 驱动加载流程
12.OpenHarmony构建系统--GN与子系统、部件、模块详解
13.ohos开机init启动流程
14.鸿蒙版性能优化指南
.......

socket send/recevice

//socket send
int CoapSocketSend(const SocketInfo *socket, const uint8_t *buffer, size_t length)
{
    if (buffer == NULL || socket == NULL) {
        return NSTACKX_EFAILED;
    }
    //目的地址
    socklen_t dstAddrLen = sizeof(struct sockaddr_in);
    int ret = sendto(socket->cliendFd, buffer, length, 0, (struct sockaddr *)&socket->dstAddr, dstAddrLen);
    return ret;
}
// socket recevice
int CoapSocketRecv(int socketFd, uint8_t *buffer, size_t length)
{
    if (buffer == NULL || socketFd < 0) {
        return NSTACKX_EFAILED;
    }
    struct sockaddr_in addr;
    socklen_t len = sizeof(struct sockaddr_in);
    (void)memset_s(&addr, sizeof(addr), 0, sizeof(addr));
    int ret = recvfrom(socketFd, buffer, length, 0, (struct sockaddr *)&addr, &len);
    return ret;
}