iptables-restore.c.counters

   1 /* Code to restore the iptables state, from file by iptables-save.
   2  * (C) 2000-2002 by Harald Welte <laforge@gnumonks.org>
   3  * based on previous code from Rusty Russell <rusty@linuxcare.com.au>
   4  *
   5  * This code is distributed under the terms of GNU GPL v2
   6  *
   7  * $Id: iptables-restore.c,v 1.26 2003/05/02 15:30:11 laforge Exp $
   8  */
   9
  10 #include <getopt.h>
  11 #include <sys/errno.h>
  12 #include <string.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include "iptables.h"
  16 #include "libiptc/libiptc.h"
  17
  18 #ifdef DEBUG
  19 #define DEBUGP(x, args...) fprintf(stderr, x, ## args)
  20 #else
  21 #define DEBUGP(x, args...)
  22 #endif
  23
  24 static int binary = 0, counters = 0, verbose = 0, noflush = 0;
  25
  26 /* Keeping track of external matches and targets.  */
  27 static struct option options[] = {
  28         { "binary", 0, 0, 'b' },
  29         { "counters", 0, 0, 'c' },
  30         { "verbose", 1, 0, 'v' },
  31         { "help", 0, 0, 'h' },
  32         { "noflush", 0, 0, 'n'},
  33         { "modprobe", 1, 0, 'M'},
  34         { 0 }
  35 };
  36
  37 static void print_usage(const char *name, const char *version) __attribute__((noreturn));
  38
  39 static void print_usage(const char *name, const char *version)
  40 {
  41         fprintf(stderr, "Usage: %s [-b] [-c] [-v] [-h]\n"
  42                         "          [ --binary ]\n"
  43                         "          [ --counters ]\n"
  44                         "          [ --verbose ]\n"
  45                         "          [ --help ]\n"
  46                         "          [ --noflush ]\n"
  47                         "          [ --modprobe=<command>]\n", name);
  48
  49         exit(1);
  50 }
  51
  52 iptc_handle_t create_handle(const char *tablename, const char* modprobe )
  53 {
  54         iptc_handle_t handle;
  55
  56         handle = iptc_init(tablename);
  57
  58         if (!handle) {
  59                 /* try to insmod the module if iptc_init failed */
  60                 iptables_insmod("ip_tables", modprobe);
  61                 handle = iptc_init(tablename);
  62         }
  63
  64         if (!handle) {
  65                 exit_error(PARAMETER_PROBLEM, "%s: unable to initialize"
  66                         "table '%s'\n", program_name, tablename);
  67                 exit(1);
  68         }
  69         return handle;
  70 }
  71
  72 int parse_counters(char *string, struct ipt_counters *ctr)
  73 {
  74         return (sscanf(string, "[%llu:%llu]", &ctr->pcnt, &ctr->bcnt) == 2);
  75 }
  76
  77 /* global new argv and argc */
  78 static char *newargv[255];
  79 static int newargc;
  80
  81 /* function adding one argument to newargv, updating newargc
  82  * returns true if argument added, false otherwise */
  83 static int add_argv(char *what) {
  84         DEBUGP("add_argv: %s\n", what);
  85         if (what && ((newargc + 1) < sizeof(newargv)/sizeof(char *))) {
  86                 newargv[newargc] = strdup(what);
  87                 newargc++;
  88                 return 1;
  89         } else
  90                 return 0;
  91 }
  92
  93 static void free_argv(void) {
  94         int i;
  95
  96         for (i = 0; i < newargc; i++)
  97                 free(newargv[i]);
  98 }
  99
 100 int main(int argc, char *argv[])
 101 {
 102         iptc_handle_t handle = NULL;
 103         char buffer[10240];
 104         int c;
 105         char curtable[IPT_TABLE_MAXNAMELEN + 1];
 106         FILE *in;
 107         const char *modprobe = 0;
 108         int in_table = 0;
 109
 110         program_name = "iptables-restore";
 111         program_version = IPTABLES_VERSION;
 112         line = 0;
 113
 114 #ifdef NO_SHARED_LIBS
 115         init_extensions();
 116 #endif
 117
 118         while ((c = getopt_long(argc, argv, "bcvhnM:", options, NULL)) != -1) {
 119                 switch (c) {
 120                         case 'b':
 121                                 binary = 1;
 122                                 break;
 123                         case 'c':
 124                                 counters = 1;
 125                                 break;
 126                         case 'v':
 127                                 verbose = 1;
 128                                 break;
 129                         case 'h':
 130                                 print_usage("iptables-restore",
 131                                             IPTABLES_VERSION);
 132                                 break;
 133                         case 'n':
 134                                 noflush = 1;
 135                                 break;
 136                         case 'M':
 137                                 modprobe = optarg;
 138                                 break;
 139                 }
 140         }
 141
 142         if (optind == argc - 1) {
 143                 in = fopen(argv[optind], "r");
 144                 if (!in) {
 145                         fprintf(stderr, "Can't open %s: %s", argv[optind],
 146                                 strerror(errno));
 147                         exit(1);
 148                 }
 149         }
 150         else if (optind < argc) {
 151                 fprintf(stderr, "Unknown arguments found on commandline");
 152                 exit(1);
 153         }
 154         else in = stdin;
 155
 156         /* Grab standard input. */
 157         while (fgets(buffer, sizeof(buffer), in)) {
 158                 int ret = 0;
 159
 160                 line++;
 161                 if (buffer[0] == '\n') continue;
 162                 else if (buffer[0] == '#') {
 163                         if (verbose) fputs(buffer, stdout);
 164                         continue;
 165                 } else if ((strcmp(buffer, "COMMIT\n") == 0) && (in_table)) {
 166                         DEBUGP("Calling commit\n");
 167                         ret = iptc_commit(&handle);
 168                         in_table = 0;
 169                 } else if ((buffer[0] == '*') && (!in_table)) {
 170                         /* New table */
 171                         char *table;
 172
 173                         table = strtok(buffer+1, " \t\n");
 174                         DEBUGP("line %u, table '%s'\n", line, table);
 175                         if (!table) {
 176                                 exit_error(PARAMETER_PROBLEM,
 177                                         "%s: line %u table name invalid\n",
 178                                         program_name, line);
 179                                 exit(1);
 180                         }
 181                         strncpy(curtable, table, IPT_TABLE_MAXNAMELEN);
 182
 183                         if (handle)
 184                                 iptc_free(&handle);
 185
 186                         handle = create_handle(table, modprobe);
 187                         if (noflush == 0) {
 188                                 DEBUGP("Cleaning all chains of table '%s'\n",
 189                                         table);
 190                                 for_each_chain(flush_entries, verbose, 1,
 191                                                 &handle);
 192
 193                                 DEBUGP("Deleting all user-defined chains "
 194                                        "of table '%s'\n", table);
 195                                 for_each_chain(delete_chain, verbose, 0,
 196                                                 &handle) ;
 197                         }
 198
 199                         ret = 1;
 200                         in_table = 1;
 201
 202                 } else if ((buffer[0] == ':') && (in_table)) {
 203                         /* New chain. */
 204                         char *policy, *chain;
 205
 206                         chain = strtok(buffer+1, " \t\n");
 207                         DEBUGP("line %u, chain '%s'\n", line, chain);
 208                         if (!chain) {
 209                                 exit_error(PARAMETER_PROBLEM,
 210                                            "%s: line %u chain name invalid\n",
 211                                            program_name, line);
 212                                 exit(1);
 213                         }
 214
 215                         if (!iptc_builtin(chain, handle)) {
 216                                 DEBUGP("Creating new chain '%s'\n", chain);
 217                                 if (!iptc_create_chain(chain, &handle))
 218                                         exit_error(PARAMETER_PROBLEM,
 219                                                    "error creating chain "
 220                                                    "'%s':%s\n", chain,
 221                                                    strerror(errno));
 222                         }
 223
 224                         policy = strtok(NULL, " \t\n");
 225                         DEBUGP("line %u, policy '%s'\n", line, policy);
 226                         if (!policy) {
 227                                 exit_error(PARAMETER_PROBLEM,
 228                                            "%s: line %u policy invalid\n",
 229                                            program_name, line);
 230                                 exit(1);
 231                         }
 232
 233                         if (strcmp(policy, "-") != 0) {
 234                                 struct ipt_counters count;
 235
 236                                 if (counters) {
 237                                         char *ctrs;
 238                                         ctrs = strtok(NULL, " \t\n");
 239
 240                                         parse_counters(ctrs, &count);
 241
 242                                 } else {
 243                                         memset(&count, 0,
 244                                                sizeof(struct ipt_counters));
 245                                 }
 246
 247                                 DEBUGP("Setting policy of chain %s to %s\n",
 248                                         chain, policy);
 249
 250                                 if (!iptc_set_policy(chain, policy, &count,
 251                                                      &handle))
 252                                         exit_error(OTHER_PROBLEM,
 253                                                 "Can't set policy `%s'"
 254                                                 " on `%s' line %u: %s\n",
 255                                                 chain, policy, line,
 256                                                 iptc_strerror(errno));
 257                         }
 258
 259                         ret = 1;
 260
 261                 } else if (in_table) {
 262                         int a;
 263                         char *ptr = buffer;
 264                         char *pcnt = NULL;
 265                         char *bcnt = NULL;
 266                         char *parsestart;
 267
 268                         /* the parser */
 269                         char *param_start, *curchar;
 270                         int quote_open;
 271
 272                         /* reset the newargv */
 273                         newargc = 0;
 274
 275                         if (buffer[0] == '[') {
 276                                 /* we have counters in our input */
 277                                 ptr = strchr(buffer, ']');
 278                                 if (!ptr)
 279                                         exit_error(PARAMETER_PROBLEM,
 280                                                    "Bad line %u: need ]\n",
 281                                                    line);
 282
 283                                 pcnt = strtok(buffer+1, ":");
 284                                 if (!pcnt)
 285                                         exit_error(PARAMETER_PROBLEM,
 286                                                    "Bad line %u: need :\n",
 287                                                    line);
 288
 289                                 bcnt = strtok(NULL, "]");
 290                                 if (!bcnt)
 291                                         exit_error(PARAMETER_PROBLEM,
 292                                                    "Bad line %u: need ]\n",
 293                                                    line);
 294
 295                                 /* start command parsing after counter */
 296                                 parsestart = ptr + 1;
 297                         } else {
 298                                 /* start command parsing at start of line */
 299                                 parsestart = buffer;
 300                         }
 301
 302                         add_argv(argv[0]);
 303                         add_argv("-t");
 304                         add_argv((char *) &curtable);
 305
 306                         if (counters && pcnt && bcnt) {
 307                                 add_argv("--set-counters");
 308                                 add_argv((char *) pcnt);
 309                                 add_argv((char *) bcnt);
 310                         }
 311
 312                         /* After fighting with strtok enough, here's now
 313                          * a 'real' parser. According to Rusty I'm now no
 314                          * longer a real hacker, but I can live with that */
 315
 316                         quote_open = 0;
 317                         param_start = parsestart;
 318
 319                         for (curchar = parsestart; *curchar; curchar++) {
 320                                 if (*curchar == '"') {
 321                                         if (quote_open) {
 322                                                 quote_open = 0;
 323                                                 *curchar = ' ';
 324                                         } else {
 325                                                 quote_open = 1;
 326                                                 param_start++;
 327                                         }
 328                                 }
 329                                 if (*curchar == ' '
 330                                     || *curchar == '\t'
 331                                     || * curchar == '\n') {
 332                                         char param_buffer[1024];
 333                                         int param_len = curchar-param_start;
 334
 335                                         if (quote_open)
 336                                                 continue;
 337
 338                                         if (!param_len) {
 339                                                 /* two spaces? */
 340                                                 param_start++;
 341                                                 continue;
 342                                         }
 343
 344                                         /* end of one parameter */
 345                                         strncpy(param_buffer, param_start,
 346                                                 param_len);
 347                                         *(param_buffer+param_len) = '\0';
 348
 349                                         /* check if table name specified */
 350                                         if (!strncmp(param_buffer, "-t", 3)
 351                                             || !strncmp(param_buffer, "--table", 8)) {
 352                                                 exit_error(PARAMETER_PROBLEM,
 353                                                    "Line %u seems to have a "
 354                                                    "-t table option.\n", line);
 355                                                 exit(1);
 356                                         }
 357
 358                                         add_argv(param_buffer);
 359                                         param_start += param_len + 1;
 360                                 } else {
 361                                         /* regular character, skip */
 362                                 }
 363                         }
 364
 365                         DEBUGP("calling do_command(%u, argv, &%s, handle):\n",
 366                                 newargc, curtable);
 367
 368                         for (a = 0; a < newargc; a++)
 369                                 DEBUGP("argv[%u]: %s\n", a, newargv[a]);
 370
 371                         ret = do_command(newargc, newargv,
 372                                          &newargv[2], &handle);
 373
 374                         free_argv();
 375                 }
 376                 if (!ret) {
 377                         fprintf(stderr, "%s: line %u failed\n",
 378                                         program_name, line);
 379                         exit(1);
 380                 }
 381         }
 382
 383         return 0;
 384 }