GSSAPI Server Example: main() Function

The gss-server main() function performs the following tasks:

• Parses command-line arguments and assigns the arguments to variables

• Acquires the credentials for the service corresponding to the mechanism

• Calls the sign_server() function, which performs the work involved with signing and returning the message

• Releases the credentials that have been acquired

• Releases the mechanism OID namespace

• Closes the connection if the connection is still open

Example 6-1 gss-server Example: main()

int
main(argc, argv)
     int argc;
     char **argv;
{
     char *service_name;
     gss_cred_id_t server_creds;
     OM_uint32 min_stat;
     u_short port = 4444;
     int s;
     int once = 0;
     int do_inetd = 0;

     log = stdout;
     display_file = stdout;

     /* Parse command-line arguments. */
     argc--; argv++;
     while (argc) {
     if (strcmp(*argv, "-port") == 0) {
          argc--; argv++;
          if (!argc) usage();
          port = atoi(*argv);
     } else if (strcmp(*argv, "-verbose") == 0) {
          verbose = 1;
     } else if (strcmp(*argv, "-once") == 0) {
          once = 1;
     } else if (strcmp(*argv, "-inetd") == 0) {
          do_inetd = 1;
     } else if (strcmp(*argv, "-logfile") == 0) {
          argc--; argv++;
          if (!argc) usage();
          log = fopen(*argv, "a");
          display_file = log;
          if (!log) {
          perror(*argv);
          exit(1);
          }
     } else
          break;
     argc--; argv++;
     }
     if (argc != 1)
          usage();

     if ((*argv)[0] == '-')
          usage();

     service_name = *argv;

     /* Acquire service credentials. */
     if (server_acquire_creds(service_name, &server_creds) < 0)
          return -1;
     
     if (do_inetd) {
          close(1);
          close(2);
          /* Sign and return message. */
          sign_server(0, server_creds);
          close(0);
     } else {
          int stmp;

          if ((stmp = create_socket(port)) >= 0) {
              do {
                  /* Accept a TCP connection */
                  if ((s = accept(stmp, NULL, 0)) < 0) {
                      perror("accepting connection");
                      continue;
                  }
                  /* This return value is not checked, because there is
                     not really anything to do if it fails. */
                  sign_server(s, server_creds);
                  close(s);
              } while (!once);

              close(stmp);
          }
     }

     /* Close down and clean up. */
     (void) gss_release_cred(&min_stat, &server_creds);

     /*NOTREACHED*/
     (void) close(s);
     return 0;
}