1 /* 2 * Copyright (C) 1993-2001 by Darren Reed. 3 * 4 * See the IPFILTER.LICENCE file for details on licencing. 5 * 6 * $Id: addipopt.c,v 1.7 2002/01/28 06:50:45 darrenr Exp $ 7 */ 8 9 #include "ipf.h" 10 11 12 int addipopt(op, io, len, class) 13 char *op; 14 struct ipopt_names *io; 15 int len; 16 char *class; 17 { 18 int olen = len; 19 struct in_addr ipadr; 20 u_short val; 21 u_char lvl; 22 char *s; 23 24 if ((len + io->on_siz) > 48) { 25 fprintf(stderr, "options too long\n"); 26 return 0; 27 } 28 len += io->on_siz; 29 *op++ = io->on_value; 30 if (io->on_siz > 1) { 31 s = op; 32 *op++ = io->on_siz; 33 *op++ = IPOPT_MINOFF; 34 35 if (class) { 36 switch (io->on_value) 37 { 38 case IPOPT_SECURITY : 39 lvl = seclevel(class); 40 *(op - 1) = lvl; 41 break; 42 case IPOPT_LSRR : 43 case IPOPT_SSRR : 44 ipadr.s_addr = inet_addr(class); 45 s[IPOPT_OLEN] = IPOPT_MINOFF - 1 + 4; 46 bcopy((char *)&ipadr, op, sizeof(ipadr)); 47 break; 48 case IPOPT_SATID : 49 val = atoi(class); 50 bcopy((char *)&val, op, 2); 51 break; 52 } 53 } 54 55 op += io->on_siz - 3; 56 if (len & 3) { 57 *op++ = IPOPT_NOP; 58 len++; 59 } 60 } 61 if (opts & OPT_DEBUG) 62 fprintf(stderr, "bo: %s %d %#x: %d\n", 63 io->on_name, io->on_value, io->on_bit, len); 64 return len - olen; 65 } 66