net_tty/net_uart.cpp

#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
//
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
//
#include <map>
#include <set>
#include <string>

#include "uart.hpp"
using namespace std;
#define BACK_LOG 10
#define MAX_RECV_SIZE 235

typedef struct {
  int fd;
  struct sockaddr_in client;
} tcpclient_t;
map<string, uint32_t> g_baundmap = {
    {"0", 0000000},       {"50", 0000001},      {"75", 0000002},      {"110", 0000003},      //
    {"134", 0000004},     {"150", 0000005},     {"200", 0000006},     {"300", 0000007},      //
    {"600", 0000010},     {"1200", 0000011},    {"1800", 0000012},    {"2400", 0000013},     //
    {"4800", 0000014},    {"9600", 0000015},    {"19200", 0000016},   {"38400", 0000017},    //
    {"57600", 0010001},   {"115200", 0010002},  {"230400", 0010003},  {"460800", 0010004},   //
    {"500000", 0010005},  {"576000", 0010006},  {"921600", 0010007},  {"1000000", 0010010},  //
    {"1152000", 0010011}, {"1500000", 0010012}, {"2000000", 0010013}, {"2500000", 0010014},  //
    {"3000000", 0010015}, {"3500000", 0010016}, {"4000000", 0010017},
};
UartDevice g_uart_device = {0};
set<int> g_remote_client_fds;

int safe_write(int fd, char *buff, size_t len) {
  int hassend = 0;
  while (true) {
    int send_this_time = write(fd, buff + hassend, len - hassend);
    if (send_this_time == 0) {
      continue;
    }
    if (send_this_time < 0) {
      return send_this_time;
    }

    hassend += send_this_time;
    if (hassend == len) {
      break;
    }
  }
  return len;
}

void printf_buf(char *rx, ssize_t size) {
  for (int i = 0; i < size; i++) {
    printf("0x%02x,", rx[i]);
  }
  printf("\n");
}

void *netclient_thread(void *arg) {
  tcpclient_t *client = (tcpclient_t *)arg;
  // while循环监听数据，接收到数据转发给串口
  char buff[4096];
  int n = 0;
  while ((n = read(client->fd, buff, 4096)) >= 0) {
    if (n == 0) {
      //返回零意味着对方关闭socket,超时返回的是负数
      break;
    }
    printf("net->uart: %d\n", n);
    printf_buf(buff, n);
    uartSend(&g_uart_device, buff, n);
  }
  printf("socket %d is closed by client-end\n", client->fd);
  close(client->fd);
  g_remote_client_fds.erase(client->fd);

  free(client);
  pthread_detach(pthread_self());
  return NULL;
}

void *uart_rx_thread_func(void *arg) {
  char buff[4096];
  while (true) {
    int ret = uartReceive(&g_uart_device, buff, 1024);  // send the received text over UART
    if (ret < 0) {
      printf("uartReceive fail\n");
      exit(-1);
    }

    //
    if (ret > 0) {
      printf("net<-uart: %d\n", ret);
      printf_buf(buff, ret);
      for (auto &clientfd : g_remote_client_fds) {
        safe_write(clientfd, buff, ret);
      }
    }
    //
  }
  return NULL;
}

int start_tcp_server(int port) {
  int listenfd, connectfd;
  struct sockaddr_in server;
  struct sockaddr_in client;
  pid_t childpid;
  socklen_t addrlen;
  listenfd = socket(AF_INET, SOCK_STREAM, 0);
  if (listenfd == -1) {
    perror("socker created failed");
    exit(0);
  }
  int option;
  option = SO_REUSEADDR;
  setsockopt(listenfd, SOL_SOCKET, option, &option, sizeof(option));
  bzero(&server, sizeof(server));
  server.sin_family = AF_INET;
  server.sin_port = htons(port);
  server.sin_addr.s_addr = htonl(INADDR_ANY);
  printf("bind......\n");
  if (bind(listenfd, (struct sockaddr *)&server, sizeof(server)) == -1) {
    perror("Bind error!");
    exit(1);
  }
  printf("listen......\n");
  if (listen(listenfd, BACK_LOG) == -1) {
    perror("listend error");
    exit(1);
  }
  printf("waiting for clinet's request.....\n");
  while (1) {
    int n;
    addrlen = sizeof(client);
    connectfd = accept(listenfd, (struct sockaddr *)&client, &addrlen);
    if (connectfd == -1) {
      perror("accept error");
      sleep(1);
      continue;
    }

    printf("%s connect to me,connectfd == %d\n", inet_ntoa(client.sin_addr), connectfd);
    g_remote_client_fds.insert(connectfd);

    pthread_t pthread;
    tcpclient_t *client = (tcpclient_t *)malloc(sizeof(tcpclient_t));
    if (client == NULL) {
      perror("malloc fail");
      exit(-1);
    }
    client->fd = connectfd;
    memcpy(&client->client, &client, sizeof(client->client));
    pthread_create(&pthread, NULL, netclient_thread, (void *)client);
  }
  return 0;
}

int openuart(struct UartDevice *device, const char *devname, int rate) {
  device->name = (char *)devname;
  device->rate = rate;

  printf("UART open  %s\n", device->name);
  return uartStart(device, 0);
}
int main(int argc, char const *argv[]) {
  /* code */
  //"net_uart /dev/ttyUSB0 115200 port"

  if (argc != 4) {
    printf("Usage: %s /dev/ttyUSB0 115200 port\n", argv[0]);
    return -1;
  }
  printf("device name:%s\n", argv[1]);
  printf("baundrate  :%s\n", argv[2]);
  printf("port       :%s\n", argv[3]);

  auto baundrate_find_result = g_baundmap.find(argv[2]);
  if (baundrate_find_result == g_baundmap.end()) {
    printf("unsupport baundrate\n");
    return -1;
    // baundrate_find_result.
  };

  /**
   *  打开串口
   */
  int rc = openuart(&g_uart_device, argv[1], baundrate_find_result->second);
  if (rc) {
    perror("open uart fail");
    exit(-1);
  }

  pthread_t uart_rx_thread;
  pthread_create(&uart_rx_thread, NULL, uart_rx_thread_func, NULL);

  start_tcp_server(atoi(argv[3]));
  while (true) {
    sleep(1);
  }

  return 0;
}