/* * Copyright (C) 1993-2001 by Darren Reed. * * See the IPFILTER.LICENCE file for details on licencing. */ #include #include #include #include #include #include #include #include #include #ifndef linux #include #endif #include #include #include #include "ip_compat.h" #include #include "ip_fil.h" #include "ipf.h" #if !defined(lint) static const char sccsid[] = "@(#)opt.c 1.8 4/10/96 (C) 1993-2000 Darren Reed"; static const char rcsid[] = "@(#)$Id: opt.c,v 2.2.2.1 2001/06/26 10:43:20 darrenr Exp $"; #endif extern int opts; struct ipopt_names ionames[] ={ { IPOPT_NOP, 0x000001, 1, "nop" }, { IPOPT_RR, 0x000002, 7, "rr" }, /* 1 route */ { IPOPT_ZSU, 0x000004, 3, "zsu" }, { IPOPT_MTUP, 0x000008, 3, "mtup" }, { IPOPT_MTUR, 0x000010, 3, "mtur" }, { IPOPT_ENCODE, 0x000020, 3, "encode" }, { IPOPT_TS, 0x000040, 8, "ts" }, /* 1 TS */ { IPOPT_TR, 0x000080, 3, "tr" }, { IPOPT_SECURITY,0x000100, 11, "sec" }, { IPOPT_SECURITY,0x000100, 11, "sec-class" }, { IPOPT_LSRR, 0x000200, 7, "lsrr" }, /* 1 route */ { IPOPT_E_SEC, 0x000400, 3, "e-sec" }, { IPOPT_CIPSO, 0x000800, 3, "cipso" }, { IPOPT_SATID, 0x001000, 4, "satid" }, { IPOPT_SSRR, 0x002000, 7, "ssrr" }, /* 1 route */ { IPOPT_ADDEXT, 0x004000, 3, "addext" }, { IPOPT_VISA, 0x008000, 3, "visa" }, { IPOPT_IMITD, 0x010000, 3, "imitd" }, { IPOPT_EIP, 0x020000, 3, "eip" }, { IPOPT_FINN, 0x040000, 3, "finn" }, { 0, 0, 0, (char *)NULL } /* must be last */ }; struct ipopt_names secclass[] = { { IPSO_CLASS_RES4, 0x01, 0, "reserv-4" }, { IPSO_CLASS_TOPS, 0x02, 0, "topsecret" }, { IPSO_CLASS_SECR, 0x04, 0, "secret" }, { IPSO_CLASS_RES3, 0x08, 0, "reserv-3" }, { IPSO_CLASS_CONF, 0x10, 0, "confid" }, { IPSO_CLASS_UNCL, 0x20, 0, "unclass" }, { IPSO_CLASS_RES2, 0x40, 0, "reserv-2" }, { IPSO_CLASS_RES1, 0x80, 0, "reserv-1" }, { 0, 0, 0, NULL } /* must be last */ }; static u_char seclevel __P((char *)); int addipopt __P((char *, struct ipopt_names *, int, char *)); static u_char seclevel(slevel) char *slevel; { struct ipopt_names *so; for (so = secclass; so->on_name; so++) if (!strcasecmp(slevel, so->on_name)) break; if (!so->on_name) { fprintf(stderr, "no such security level: %s\n", slevel); return 0; } return (u_char)so->on_value; } int addipopt(op, io, len, class) char *op; struct ipopt_names *io; int len; char *class; { int olen = len; struct in_addr ipadr; u_short val; u_char lvl; char *s; if ((len + io->on_siz) > 48) { fprintf(stderr, "options too long\n"); return 0; } len += io->on_siz; *op++ = io->on_value; if (io->on_siz > 1) { s = op; *op++ = io->on_siz; *op++ = IPOPT_MINOFF; if (class) { switch (io->on_value) { case IPOPT_SECURITY : lvl = seclevel(class); *(op - 1) = lvl; break; case IPOPT_LSRR : case IPOPT_SSRR : ipadr.s_addr = inet_addr(class); s[IPOPT_OLEN] = IPOPT_MINOFF - 1 + 4; bcopy((char *)&ipadr, op, sizeof(ipadr)); break; case IPOPT_SATID : val = atoi(class); bcopy((char *)&val, op, 2); break; } } op += io->on_siz - 3; if (len & 3) { *op++ = IPOPT_NOP; len++; } } if (opts & OPT_DEBUG) fprintf(stderr, "bo: %s %d %#x: %d\n", io->on_name, io->on_value, io->on_bit, len); return len - olen; } u_32_t buildopts(cp, op, len) char *cp, *op; int len; { struct ipopt_names *io; u_32_t msk = 0; char *s, *t; int inc; for (s = strtok(cp, ","); s; s = strtok(NULL, ",")) { if ((t = strchr(s, '='))) *t++ = '\0'; for (io = ionames; io->on_name; io++) { if (strcasecmp(s, io->on_name) || (msk & io->on_bit)) continue; if ((inc = addipopt(op, io, len, t))) { op += inc; len += inc; } msk |= io->on_bit; break; } if (!io->on_name) { fprintf(stderr, "unknown IP option name %s\n", s); return 0; } } *op++ = IPOPT_EOL; len++; return len; }