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client.c
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client.c
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#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#define DEFAULT_IP "127.0.0.1"
#define DEFAULT_PORT 6666
int main(int argc, char* argv[])
{
char* SERVER_IP = DEFAULT_IP;
int SERVER_PORT = DEFAULT_PORT;
if (argc > 3) {
printf("param err:\nUsage: %s ip port | %s port | %s\n", argv[0],
argv[0], argv[0]);
} else if (argc == 3) {
SERVER_IP = argv[1];
SERVER_PORT = atoi(argv[2]);
} else if (argc == 2) {
SERVER_PORT = atoi(argv[1]);
} else {
// Do nothing
}
int cliSocket;
char* sendbuf = "Hello Server, I am Client.";
if ((cliSocket = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
printf("socket err");
exit(1);
}
struct sockaddr_in servAddr;
servAddr.sin_family = AF_INET;
servAddr.sin_port = htons(SERVER_PORT);
// servAddr.sin_addr.s_addr = inet_addr(SERVER_IP); //Outdated method
inet_aton(SERVER_IP, &servAddr.sin_addr);
if (connect(cliSocket, (struct sockaddr*)&servAddr, sizeof(servAddr)) < 0) {
printf("connect err");
exit(1);
}
printf("Connect with destination host %s:%d ...\n\n", SERVER_IP,
SERVER_PORT);
while (1) {
int num = send(cliSocket, sendbuf, strlen(sendbuf) + 1, 0);
if (num == (int)strlen(sendbuf) + 1) {
printf("Send: Hello Server, I am Client.\nlength:%d\n\n", num);
}
else {
printf("send err\n");
}
sleep(1);
}
close(cliSocket);
return 0;
}