doorgo/door32.c

#include <stdio.h>
#include <stdlib.h>

#include <netdb.h>
#include <netinet/in.h>
#include <termios.h>
#include <unistd.h>

#include <string.h>

void doprocessing (int sock);
char * cmds[10];

int main( int argc, char *argv[] ) {
   int sockfd, newsockfd, portno, clilen;
   char buffer[256];
   struct sockaddr_in serv_addr, cli_addr;
   int n, pid;
   
   /* First call to socket() function */
   sockfd = socket(AF_INET, SOCK_STREAM, 0);
   
   if (sockfd < 0) {
      perror("ERROR opening socket");
      exit(1);
   }

   if (argc != 3) {
	printf("I need a listening port number, and command/door to call.\n");
        exit(2);
   }
   
   int listen_port = atoi(argv[1]);
   char * command = strdup(argv[2]);
   char * cp;
   int cmd_count;
   cp = command;
   cmds[cmd_count] = cp;
   cmd_count++;
   while (*cp != 0) {
      if (*cp == ' ') {
	*cp = 0;
	cp++;
	cmds[cmd_count] = cp;
        cmd_count++;
	continue;
      }
      cp++;
   }
   cmds[cmd_count] = (char *)NULL;

   if (listen_port ==0) {
      printf("I need a listening port number as a parameter.\n");
      exit(2);
   }

   /* Initialize socket structure */
   bzero((char *) &serv_addr, sizeof(serv_addr));
   portno = listen_port;
   
   serv_addr.sin_family = AF_INET;
   serv_addr.sin_addr.s_addr = INADDR_ANY;
   serv_addr.sin_port = htons(portno);

   int flag = 1;  
   if (-1 == setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof(flag))) {  
      perror("setsockopt fail");  
   }  

   /* Now bind the host address using bind() call.*/
   if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
      perror("ERROR on binding");
      exit(1);
   }
   
   /* Now start listening for the clients, here
      * process will go in sleep mode and will wait
      * for the incoming connection
   */
   
   listen(sockfd,5);
   clilen = sizeof(cli_addr);
   
   while (1) {
      newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
		
      if (newsockfd < 0) {
         perror("ERROR on accept");
         exit(1);
      }
      
      /* Create child process */
      pid = fork();
		
      if (pid < 0) {
         perror("ERROR on fork");
         exit(1);
      }
      
      if (pid == 0) {
         /* This is the client process */
         close(sockfd);
         doprocessing(newsockfd);
         exit(0);
      }
      else {
         close(newsockfd);
      }
		
   } /* end of while */
   free((void*)command);
}

void doprocessing (int sock) {
   int n;
   char buffer[256];
   // raw mode
   struct termios tio_raw;
   tcgetattr(sock, &tio_raw);
   cfmakeraw(&tio_raw);
   tcsetattr(sock, TCSANOW, &tio_raw);
   // telnet client into character mode
   // sprintf(buffer, "\377\375\042\377\373\001Welcome socket %d\n\r", sock);
   sprintf(buffer, "Welcome socket %d\n\r", sock);
   write(sock, buffer, strlen(buffer) );

   // can I read the buffer until empty, maybe?

   FILE * fp;

   fp = fopen("door32.sys", "w");
   if ( fp == NULL) {
      return;
   }

   fprintf(fp, "%d\n", 2);
   fprintf(fp, "%d\n", sock);
   fprintf(fp, "38400\n");
   fprintf(fp, "Fake Door32 BBS\n");
   fprintf(fp, "1\n");
   fprintf(fp, "%s\n%s\n", "Bugz Laundry", "Bugz");
   fprintf(fp, "%d\n", 100);
   fprintf(fp, "%d\n", 120);
   fprintf(fp, "1\n1\n");
   fclose(fp);

   // This resets the termios ??  
   // execl("./testdoor", "testdoor", "-d", "door32.sys", (const char *)NULL);
   execv(cmds[0], cmds);

   // step1:  write out door32.sys file
   // exec / replace this with our door

   /*
   bzero(buffer,256);
   
   n = read(sock,buffer,255);
   
   if (n < 0) {
      perror("ERROR reading from socket");
      exit(1);
   }
   
   printf("Here is the message: %s\n",buffer);
   n = write(sock,"I got your message",18);
   
   if (n < 0) {
      perror("ERROR writing to socket");
      exit(1);
   }
   */

}