2.11BSD#431 - /usr/src/libexec/tcpd/fix_options.c

   1:  /*
   2:   * Routine to disable IP-level socket options. This code was taken from 4.4BSD
   3:   * rlogind source, but all mistakes in it are my fault.
   4:   *
   5:   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
   6:   */
   7: 
   8: #ifndef lint
   9: static char sccsid[] = "@(#) fix_options.c 1.3 94/12/28 17:42:22";
  10: #endif
  11: 
  12: #include <sys/types.h>
  13: #include <sys/param.h>
  14: #include <netinet/in.h>
  15: #include <netdb.h>
  16: #include <stdio.h>
  17: #include <syslog.h>
  18: 
  19: #include "tcpd.h"
  20: 
  21: /* fix_options - get rid of IP-level socket options */
  22: 
  23: fix_options(request)
  24: struct request_info *request;
  25: {
  26: #ifdef IP_OPTIONS
  27:     unsigned char optbuf[BUFSIZ / 3], *cp;
  28:     char    lbuf[BUFSIZ], *lp;
  29:     int     optsize = sizeof(optbuf), ipproto;
  30:     struct protoent *ip;
  31:     int     fd = request->fd;
  32: 
  33:     if ((ip = getprotobyname("ip")) != 0)
  34:     ipproto = ip->p_proto;
  35:     else
  36:     ipproto = IPPROTO_IP;
  37: 
  38:     if (getsockopt(fd, ipproto, IP_OPTIONS, (char *) optbuf, &optsize) == 0
  39:     && optsize != 0) {
  40:     lp = lbuf;
  41:     for (cp = optbuf; optsize > 0; cp++, optsize--, lp += 3)
  42:         sprintf(lp, " %2.2x", *cp);
  43:     syslog(LOG_NOTICE,
  44:            "connect from %s with IP options (ignored):%s",
  45:            eval_client(request), lbuf);
  46:     if (setsockopt(fd, ipproto, IP_OPTIONS, (char *) 0, optsize) != 0) {
  47:         syslog(LOG_ERR, "setsockopt IP_OPTIONS NULL: %m");
  48:         clean_exit(request);
  49:     }
  50:     }
  51: #endif
  52: }

Defined functions

Defined variables