prog.l_ada/TMP/Practice/sem25.10/s_inet.c

#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define FIN "exit"

int main(int argc, char *argv[]) {
   int sock;
   socklen_t length;
   struct sockaddr_in server;
   int msgsock;
   char buf[1024];
   int rval;
 
   sock = socket(AF_INET, SOCK_STREAM, 0);
   if (sock == -1) {
      perror("opening stream socket");
      exit(1);
   }
   
   server.sin_family = AF_INET;
   server.sin_addr.s_addr = htonl(INADDR_ANY);
   if(argc == 2) server.sin_port = htons(atoi(argv[1]));
   else server.sin_port = 0;
   
   if (bind(sock, (struct sockaddr *) &server, sizeof server)  == -1) {
      perror("binding stream socket");
      exit(1);
   }

   length = sizeof server;
   if (getsockname(sock,(struct sockaddr *) &server, &length) == -1) {
      perror("getting socket name");
      exit(1);
   }
   printf("Socket port %d\n", ntohs(server.sin_port));

   listen(sock, 5);
   do {
      if ((msgsock = accept(sock,(struct sockaddr *) NULL,(socklen_t *) NULL)) == -1) 
         perror("accept");
      else 
      do {
         memset(buf, 0, sizeof buf);
         if ((rval = read(msgsock, buf, 1024)) == -1)
            perror("reading stream message");
         dprintf(1,"-[%d]\n",rval);
         if (rval == 0)
            printf("Connection finished\n");
         else{
            dprintf(1,"[%s]\n",buf);
         }
//         if (!strcmp(buf,FIN)) {break;}
      } while ((rval > 0) && (strcmp(buf,FIN)));
      close(msgsock);
   } while(strcmp(buf,FIN));
   exit(0);
}