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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/wait.h>
static struct sockaddr_in g_src;
int srcPort = 0;
int destPort = 0;
int times = 0;
#ifdef DEBUG
#define DBG(fmt, arg...) do { \
DBG(fmt, ##arg); \
} while(0)
#else
#define DBG(fmt, arg...) ((void)0)
#endif
static void setArgsDefault()
{
memset(&g_src, 0, sizeof(g_src));
g_src.sin_family = AF_INET;
g_src.sin_addr.s_addr = inet_addr("0.0.0.0");
g_src.sin_port = htons(7895);
bzero(&(g_src.sin_zero), 8);
times = 1;
}
static int process_arg(int argc, char *argv[])
{
int opt = 0;
int error = 0;
const char *optstring = "s:a:t:";
if (argc < 5)
{
DBG("Param info :-p dest_portid; -d dest_serverIP; -a src_portid; -s src_clientIP; -t times; \n");
return -1;
}
setArgsDefault();
while ((opt = getopt(argc, argv, optstring)) != -1)
{
switch (opt)
{
case 's':
g_src.sin_addr.s_addr = inet_addr(optarg);
break;
case 'a':
g_src.sin_port = htons(atoi(optarg));
break;
case 't':
times = atoi(optarg);
break;
}
}
return 0;
}
int main(int argc, char *argv[])
{
int sockfd, ret;
int newSocket;
socklen_t addr_size;
static struct sockaddr_in accept_addr;
char buffer[1024];
pid_t childpid;
/*
* check command line arguments
*/
if (0 != process_arg(argc, argv))
{
DBG("Error in argument.%d\n", argc);
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
{
DBG("Error in connection.\n");
exit(1);
}
DBG("Server Socket is created. %d\n", sockfd);
ret = bind(sockfd, (struct sockaddr *) &g_src, sizeof(g_src));
if (ret < 0)
{
DBG("Error in binding.\n");
exit(1);
}
DBG("Bind sucess port %d\n", g_src.sin_port);
if (listen(sockfd, 10) == 0)
{
DBG("Listening on %s....\n", inet_ntoa(g_src.sin_addr));
}
else
{
DBG("Error in binding.\n");
}
while (1)
{
newSocket =
accept(sockfd, (struct sockaddr *) &accept_addr, &addr_size);
if (newSocket < 0)
{
DBG("Error: Exiting here pid %d", getpid());
exit(1);
}
DBG("Connection accepted from %s:%d fd %d\n",
inet_ntoa(accept_addr.sin_addr),
ntohs(accept_addr.sin_port), newSocket);
if ((childpid = fork()) == 0)
{
DBG("[ PID %d] Child process Created. Pid %d \r\n", getpid(),
getpid());
DBG("[ PID %d] Closing fd %d\n", getpid(), sockfd);
close(sockfd);
while (1)
{
memset(buffer, '\0', 1024 * sizeof(char));
recv(newSocket, buffer, 1024, 0);
if (strcmp(buffer, "#exit") == 0)
{
DBG("Disconnected from %s:%d\n",
inet_ntoa(newAddr.sin_addr), ntohs(newAddr.sin_port));
break;
}
else
{
DBG("[PID %d]Client: %s\n", getpid(), buffer);
send(newSocket, buffer, strlen(buffer), 0);
bzero(buffer, sizeof(buffer));
}
}
DBG("[PID %d]Closing socket %d\r\n", getpid(), newSocket);
close(newSocket);
}
}
DBG("[PID %d]Process exiting... %d\r\n", getpid(), getpid());
return 0;
}
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