client.c

#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#define BUFFER_SIZE 200

typedef struct {
  int   port;
  char *host[15];
} info;

void *checkPort(void *sarg) {
  info *pinfo = (info *)sarg;
  int   port = pinfo->port;
  char *host = *pinfo->host;
  int   clientSocket;

  struct sockaddr_in serverAddr;
  char               sendbuf[BUFFER_SIZE];
  char               recvbuf[BUFFER_SIZE];
  int                iDataNum;
  if ((clientSocket = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
    perror("socket");
    return NULL;
  }
  serverAddr.sin_family = AF_INET;
  serverAddr.sin_port = htons(port);

  serverAddr.sin_addr.s_addr = inet_addr(host);

  printf("=================================\n");
  if (connect(clientSocket, (struct sockaddr *)&serverAddr, sizeof(serverAddr)) < 0) {
    perror("connect");
    return NULL;
  }
  printf("Connect to: %s:%d...success\n", host, port);

  sprintf(sendbuf, "send port_%d", port);
  send(clientSocket, sendbuf, strlen(sendbuf), 0);
  printf("Send msg_%d: %s\n", port, sendbuf);

  recvbuf[0] = '\0';
  iDataNum = recv(clientSocket, recvbuf, BUFFER_SIZE, 0);
  recvbuf[iDataNum] = '\0';
  printf("Read ack msg_%d: %s\n", port, recvbuf);

  printf("=================================\n");
  close(clientSocket);
  return NULL;
}

void *checkUPort(void *sarg) {
  info *pinfo = (info *)sarg;
  int   port = pinfo->port;
  char *host = *pinfo->host;
  int   clientSocket;

  struct sockaddr_in serverAddr;
  char               sendbuf[BUFFER_SIZE];
  char               recvbuf[BUFFER_SIZE];
  int                iDataNum;
  if ((clientSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
    perror("socket");
    return NULL;
  }
  serverAddr.sin_family = AF_INET;
  serverAddr.sin_port = htons(port);

  serverAddr.sin_addr.s_addr = inet_addr(host);

  printf("=================================\n");
  // if (connect(clientSocket, (struct sockaddr *)&serverAddr, sizeof(serverAddr)) < 0) {
  //   perror("connect");
  //   return NULL;
  // }

  // printf("Connect to: %s:%d...success\n", host, port);

  sprintf(sendbuf, "send msg port_%d by udp", port);

  socklen_t sin_size = sizeof(*(struct sockaddr*)&serverAddr);

  sendto(clientSocket, sendbuf, strlen(sendbuf), 0, (struct sockaddr *)&serverAddr, (int)sin_size);

  printf("Send msg_%d by udp: %s\n", port, sendbuf);

  recvbuf[0] = '\0';
  iDataNum = recvfrom(clientSocket, recvbuf, BUFFER_SIZE, 0, (struct sockaddr *)&serverAddr, &sin_size);
  recvbuf[iDataNum] = '\0';
  printf("Read ack msg_%d from udp: %s\n", port, recvbuf);

  printf("=================================\n");
  close(clientSocket);
  return NULL;
}

int main() {
  int   port = 6020;
  char *host = "127.0.0.1";
  info *infos = malloc(10 * sizeof(info));
  info *uinfos = malloc(10 * sizeof(info));

  for (size_t i = 0; i < 10; i++) {
    port++;
    printf("For test: %s:%d\n", host, port);

    info *pinfo = infos++;
    *pinfo->host = host;
    pinfo->port = port;
    checkPort(pinfo);

    info *uinfo = uinfos++;
    *uinfo->host = host;
    uinfo->port = port;
    checkUPort(uinfo);
  }
}