contrib/ipfilter/ipsend/ipsopt.c

   1 /*
   2  * Copyright (C) 1995-1998 by Darren Reed.
   3  *
   4  * See the IPFILTER.LICENCE file for details on licencing.
   5  */
   6 #if defined(__sgi) && (IRIX > 602)
   7 # include <sys/ptimers.h>
   8 #endif
   9 #include <sys/param.h>
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <stdlib.h>
  13 #include <sys/types.h>
  14 #include <sys/time.h>
  15 #include <sys/socket.h>
  16 #include <netinet/in.h>
  17 #include <netinet/in_systm.h>
  18 #include <netinet/ip.h>
  19 #ifndef linux
  20 #include <netinet/ip_var.h>
  21 #endif
  22 #include <netinet/tcp.h>
  23 #include <arpa/inet.h>
  24 #include "ipsend.h"
  25
  26 #if !defined(lint)
  27 static const char sccsid[] = "@(#)ipsopt.c      1.2 1/11/96 (C)1995 Darren Reed";
  28 static const char rcsid[] = "@(#)$Id: ipsopt.c,v 2.1.4.5 2004/04/10 11:50:52 darrenr Exp $";
  29 #endif
  30
  31
  32 struct ipopt_names ionames[] = {
  33         { IPOPT_EOL,    0x01,   1, "eol" },
  34         { IPOPT_NOP,    0x02,   1, "nop" },
  35         { IPOPT_RR,     0x04,   3, "rr" },      /* 1 route */
  36         { IPOPT_TS,     0x08,   8, "ts" },      /* 1 TS */
  37         { IPOPT_SECURITY, 0x08, 11, "sec-level" },
  38         { IPOPT_LSRR,   0x10,   7, "lsrr" },    /* 1 route */
  39         { IPOPT_SATID,  0x20,   4, "satid" },
  40         { IPOPT_SSRR,   0x40,   7, "ssrr" },    /* 1 route */
  41         { 0, 0, 0, NULL }       /* must be last */
  42 };
  43
  44 struct  ipopt_names secnames[] = {
  45         { IPOPT_SECUR_UNCLASS,  0x0100, 0, "unclass" },
  46         { IPOPT_SECUR_CONFID,   0x0200, 0, "confid" },
  47         { IPOPT_SECUR_EFTO,     0x0400, 0, "efto" },
  48         { IPOPT_SECUR_MMMM,     0x0800, 0, "mmmm" },
  49         { IPOPT_SECUR_RESTR,    0x1000, 0, "restr" },
  50         { IPOPT_SECUR_SECRET,   0x2000, 0, "secret" },
  51         { IPOPT_SECUR_TOPSECRET, 0x4000,0, "topsecret" },
  52         { 0, 0, 0, NULL }       /* must be last */
  53 };
  54
  55
  56 u_short seclevel(slevel)
  57 char *slevel;
  58 {
  59         struct ipopt_names *so;
  60
  61         for (so = secnames; so->on_name; so++)
  62                 if (!strcasecmp(slevel, so->on_name))
  63                         break;
  64
  65         if (!so->on_name) {
  66                 fprintf(stderr, "no such security level: %s\n", slevel);
  67                 return 0;
  68         }
  69         return so->on_value;
  70 }
  71
  72
  73 int addipopt(op, io, len, class)
  74 char *op;
  75 struct ipopt_names *io;
  76 int len;
  77 char *class;
  78 {
  79         struct in_addr ipadr;
  80         int olen = len, srr = 0;
  81         u_short val;
  82         u_char lvl;
  83         char *s = op, *t;
  84
  85         if ((len + io->on_siz) > 48) {
  86                 fprintf(stderr, "options too long\n");
  87                 return 0;
  88         }
  89         len += io->on_siz;
  90         *op++ = io->on_value;
  91         if (io->on_siz > 1) {
  92                 /*
  93                  * Allow option to specify RR buffer length in bytes.
  94                  */
  95                 if (io->on_value == IPOPT_RR) {
  96                         val = (class && *class) ? atoi(class) : 4;
  97                         *op++ = val + io->on_siz;
  98                         len += val;
  99                 } else
 100                         *op++ = io->on_siz;
 101                 if (io->on_value == IPOPT_TS)
 102                         *op++ = IPOPT_MINOFF + 1;
 103                 else
 104                         *op++ = IPOPT_MINOFF;
 105
 106                 while (class && *class) {
 107                         t = NULL;
 108                         switch (io->on_value)
 109                         {
 110                         case IPOPT_SECURITY :
 111                                 lvl = seclevel(class);
 112                                 *(op - 1) = lvl;
 113                                 break;
 114                         case IPOPT_LSRR :
 115                         case IPOPT_SSRR :
 116                                 if ((t = strchr(class, ',')))
 117                                         *t = '\0';
 118                                 ipadr.s_addr = inet_addr(class);
 119                                 srr++;
 120                                 bcopy((char *)&ipadr, op, sizeof(ipadr));
 121                                 op += sizeof(ipadr);
 122                                 break;
 123                         case IPOPT_SATID :
 124                                 val = atoi(class);
 125                                 bcopy((char *)&val, op, 2);
 126                                 break;
 127                         }
 128
 129                         if (t)
 130                                 *t++ = ',';
 131                         class = t;
 132                 }
 133                 if (srr)
 134                         s[IPOPT_OLEN] = IPOPT_MINOFF - 1 + 4 * srr;
 135                 if (io->on_value == IPOPT_RR)
 136                         op += val;
 137                 else
 138                         op += io->on_siz - 3;
 139         }
 140         return len - olen;
 141 }
 142
 143
 144 u_32_t buildopts(cp, op, len)
 145 char *cp, *op;
 146 int len;
 147 {
 148         struct ipopt_names *io;
 149         u_32_t msk = 0;
 150         char *s, *t;
 151         int inc, lastop = -1;
 152
 153         for (s = strtok(cp, ","); s; s = strtok(NULL, ",")) {
 154                 if ((t = strchr(s, '=')))
 155                         *t++ = '\0';
 156                 for (io = ionames; io->on_name; io++) {
 157                         if (strcasecmp(s, io->on_name) || (msk & io->on_bit))
 158                                 continue;
 159                         lastop = io->on_value;
 160                         if ((inc = addipopt(op, io, len, t))) {
 161                                 op += inc;
 162                                 len += inc;
 163                         }
 164                         msk |= io->on_bit;
 165                         break;
 166                 }
 167                 if (!io->on_name) {
 168                         fprintf(stderr, "unknown IP option name %s\n", s);
 169                         return 0;
 170                 }
 171         }
 172
 173         if (len & 3) {
 174                 while (len & 3) {
 175                         *op++ = ((len & 3) == 3) ? IPOPT_EOL : IPOPT_NOP;
 176                         len++;
 177                 }
 178         } else {
 179                 if (lastop != IPOPT_EOL) {
 180                         if (lastop == IPOPT_NOP)
 181                                 *(op - 1) = IPOPT_EOL;
 182                         else {
 183                                 *op++ = IPOPT_NOP;
 184                                 *op++ = IPOPT_NOP;
 185                                 *op++ = IPOPT_NOP;
 186                                 *op = IPOPT_EOL;
 187                                 len += 4;
 188                         }
 189                 }
 190         }
 191         return len;
 192 }