Yasuyuki KOZAKAI | 5208806 | 2007-07-24 05:44:11 +0000 | [diff] [blame] | 1 | /* |
| 2 | * (C) 2000-2006 by the netfilter coreteam <coreteam@netfilter.org>: |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 17 | */ |
| 18 | |
Yasuyuki KOZAKAI | 3dfa448 | 2007-07-24 05:45:33 +0000 | [diff] [blame] | 19 | #include <errno.h> |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 20 | #include <fcntl.h> |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 21 | #include <netdb.h> |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 22 | #include <stdarg.h> |
Jan Engelhardt | cd9e7aa | 2008-01-20 13:18:54 +0000 | [diff] [blame] | 23 | #include <stdbool.h> |
Yasuyuki KOZAKAI | 3dfa448 | 2007-07-24 05:45:33 +0000 | [diff] [blame] | 24 | #include <stdio.h> |
| 25 | #include <stdlib.h> |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 26 | #include <string.h> |
| 27 | #include <unistd.h> |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 28 | #include <sys/socket.h> |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 29 | #include <sys/stat.h> |
| 30 | #include <sys/types.h> |
| 31 | #include <sys/wait.h> |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 32 | #include <arpa/inet.h> |
Yasuyuki KOZAKAI | 3dfa448 | 2007-07-24 05:45:33 +0000 | [diff] [blame] | 33 | |
Yasuyuki KOZAKAI | 5208806 | 2007-07-24 05:44:11 +0000 | [diff] [blame] | 34 | #include <xtables.h> |
Yasuyuki KOZAKAI | 3dfa448 | 2007-07-24 05:45:33 +0000 | [diff] [blame] | 35 | |
Mike Frysinger | 5a26b5f | 2007-12-19 14:51:17 +0000 | [diff] [blame] | 36 | #ifndef NO_SHARED_LIBS |
| 37 | #include <dlfcn.h> |
| 38 | #endif |
| 39 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 40 | #define NPROTO 255 |
| 41 | |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 42 | #ifndef PROC_SYS_MODPROBE |
| 43 | #define PROC_SYS_MODPROBE "/proc/sys/kernel/modprobe" |
| 44 | #endif |
| 45 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 46 | char *lib_dir; |
| 47 | |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 48 | /* the path to command to load kernel module */ |
Jan Engelhardt | dbb7754 | 2008-02-11 00:33:30 +0100 | [diff] [blame] | 49 | const char *modprobe_program = NULL; |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 50 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 51 | /* Keeping track of external matches and targets: linked lists. */ |
| 52 | struct xtables_match *xtables_matches; |
| 53 | struct xtables_target *xtables_targets; |
| 54 | |
Yasuyuki KOZAKAI | 3dfa448 | 2007-07-24 05:45:33 +0000 | [diff] [blame] | 55 | void *fw_calloc(size_t count, size_t size) |
| 56 | { |
| 57 | void *p; |
| 58 | |
| 59 | if ((p = calloc(count, size)) == NULL) { |
| 60 | perror("ip[6]tables: calloc failed"); |
| 61 | exit(1); |
| 62 | } |
| 63 | |
| 64 | return p; |
| 65 | } |
| 66 | |
| 67 | void *fw_malloc(size_t size) |
| 68 | { |
| 69 | void *p; |
| 70 | |
| 71 | if ((p = malloc(size)) == NULL) { |
| 72 | perror("ip[6]tables: malloc failed"); |
| 73 | exit(1); |
| 74 | } |
| 75 | |
| 76 | return p; |
| 77 | } |
Yasuyuki KOZAKAI | 0b82e8e | 2007-07-24 05:47:40 +0000 | [diff] [blame] | 78 | |
| 79 | static char *get_modprobe(void) |
| 80 | { |
| 81 | int procfile; |
| 82 | char *ret; |
| 83 | |
| 84 | #define PROCFILE_BUFSIZ 1024 |
| 85 | procfile = open(PROC_SYS_MODPROBE, O_RDONLY); |
| 86 | if (procfile < 0) |
| 87 | return NULL; |
| 88 | |
| 89 | ret = (char *) malloc(PROCFILE_BUFSIZ); |
| 90 | if (ret) { |
| 91 | memset(ret, 0, PROCFILE_BUFSIZ); |
| 92 | switch (read(procfile, ret, PROCFILE_BUFSIZ)) { |
| 93 | case -1: goto fail; |
| 94 | case PROCFILE_BUFSIZ: goto fail; /* Partial read. Wierd */ |
| 95 | } |
| 96 | if (ret[strlen(ret)-1]=='\n') |
| 97 | ret[strlen(ret)-1]=0; |
| 98 | close(procfile); |
| 99 | return ret; |
| 100 | } |
| 101 | fail: |
| 102 | free(ret); |
| 103 | close(procfile); |
| 104 | return NULL; |
| 105 | } |
| 106 | |
| 107 | int xtables_insmod(const char *modname, const char *modprobe, int quiet) |
| 108 | { |
| 109 | char *buf = NULL; |
| 110 | char *argv[4]; |
| 111 | int status; |
| 112 | |
| 113 | /* If they don't explicitly set it, read out of kernel */ |
| 114 | if (!modprobe) { |
| 115 | buf = get_modprobe(); |
| 116 | if (!buf) |
| 117 | return -1; |
| 118 | modprobe = buf; |
| 119 | } |
| 120 | |
| 121 | switch (fork()) { |
| 122 | case 0: |
| 123 | argv[0] = (char *)modprobe; |
| 124 | argv[1] = (char *)modname; |
| 125 | if (quiet) { |
| 126 | argv[2] = "-q"; |
| 127 | argv[3] = NULL; |
| 128 | } else { |
| 129 | argv[2] = NULL; |
| 130 | argv[3] = NULL; |
| 131 | } |
| 132 | execv(argv[0], argv); |
| 133 | |
| 134 | /* not usually reached */ |
| 135 | exit(1); |
| 136 | case -1: |
| 137 | return -1; |
| 138 | |
| 139 | default: /* parent */ |
| 140 | wait(&status); |
| 141 | } |
| 142 | |
| 143 | free(buf); |
| 144 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) |
| 145 | return 0; |
| 146 | return -1; |
| 147 | } |
| 148 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 149 | int load_xtables_ko(const char *modprobe, int quiet) |
| 150 | { |
| 151 | static int loaded = 0; |
| 152 | static int ret = -1; |
| 153 | |
| 154 | if (!loaded) { |
| 155 | ret = xtables_insmod(afinfo.kmod, modprobe, quiet); |
| 156 | loaded = (ret == 0); |
| 157 | } |
| 158 | |
| 159 | return ret; |
| 160 | } |
| 161 | |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 162 | int string_to_number_ll(const char *s, unsigned long long min, |
| 163 | unsigned long long max, unsigned long long *ret) |
| 164 | { |
| 165 | unsigned long long number; |
| 166 | char *end; |
| 167 | |
| 168 | /* Handle hex, octal, etc. */ |
| 169 | errno = 0; |
| 170 | number = strtoull(s, &end, 0); |
| 171 | if (*end == '\0' && end != s) { |
| 172 | /* we parsed a number, let's see if we want this */ |
| 173 | if (errno != ERANGE && min <= number && (!max || number <= max)) { |
| 174 | *ret = number; |
| 175 | return 0; |
| 176 | } |
| 177 | } |
| 178 | return -1; |
| 179 | } |
| 180 | |
| 181 | int string_to_number_l(const char *s, unsigned long min, unsigned long max, |
| 182 | unsigned long *ret) |
| 183 | { |
| 184 | int result; |
| 185 | unsigned long long number; |
| 186 | |
| 187 | result = string_to_number_ll(s, min, max, &number); |
| 188 | *ret = (unsigned long)number; |
| 189 | |
| 190 | return result; |
| 191 | } |
| 192 | |
| 193 | int string_to_number(const char *s, unsigned int min, unsigned int max, |
| 194 | unsigned int *ret) |
| 195 | { |
| 196 | int result; |
| 197 | unsigned long number; |
| 198 | |
| 199 | result = string_to_number_l(s, min, max, &number); |
| 200 | *ret = (unsigned int)number; |
| 201 | |
| 202 | return result; |
| 203 | } |
| 204 | |
Jan Engelhardt | cd9e7aa | 2008-01-20 13:18:54 +0000 | [diff] [blame] | 205 | /* |
| 206 | * strtonum{,l} - string to number conversion |
| 207 | * |
| 208 | * If @end is NULL, we assume the caller does not want |
| 209 | * a case like "15a", so reject it. |
| 210 | */ |
| 211 | bool strtonuml(const char *s, char **end, unsigned long *value, |
| 212 | unsigned long min, unsigned long max) |
| 213 | { |
| 214 | unsigned long v; |
| 215 | char *my_end; |
| 216 | |
| 217 | errno = 0; |
| 218 | v = strtoul(s, &my_end, 0); |
| 219 | |
| 220 | if (my_end == s) |
| 221 | return false; |
| 222 | if (end != NULL) |
| 223 | *end = my_end; |
| 224 | |
| 225 | if (errno != ERANGE && min <= v && (max == 0 || v <= max)) { |
| 226 | if (value != NULL) |
| 227 | *value = v; |
| 228 | if (end == NULL) |
| 229 | return *my_end == '\0'; |
| 230 | return true; |
| 231 | } |
| 232 | |
| 233 | return false; |
| 234 | } |
| 235 | |
| 236 | bool strtonum(const char *s, char **end, unsigned int *value, |
| 237 | unsigned int min, unsigned int max) |
| 238 | { |
| 239 | unsigned long v; |
| 240 | bool ret; |
| 241 | |
| 242 | ret = strtonuml(s, end, &v, min, max); |
| 243 | if (value != NULL) |
| 244 | *value = v; |
| 245 | return ret; |
| 246 | } |
| 247 | |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 248 | int service_to_port(const char *name, const char *proto) |
| 249 | { |
| 250 | struct servent *service; |
| 251 | |
| 252 | if ((service = getservbyname(name, proto)) != NULL) |
| 253 | return ntohs((unsigned short) service->s_port); |
| 254 | |
| 255 | return -1; |
| 256 | } |
| 257 | |
| 258 | u_int16_t parse_port(const char *port, const char *proto) |
| 259 | { |
Jan Engelhardt | 7a236f4 | 2008-03-03 12:30:41 +0100 | [diff] [blame] | 260 | unsigned int portnum; |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 261 | |
| 262 | if ((string_to_number(port, 0, 65535, &portnum)) != -1 || |
Max Kellermann | 9ee386a | 2008-01-29 13:48:05 +0000 | [diff] [blame] | 263 | (portnum = service_to_port(port, proto)) != (unsigned)-1) |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 264 | return (u_int16_t)portnum; |
| 265 | |
| 266 | exit_error(PARAMETER_PROBLEM, |
| 267 | "invalid port/service `%s' specified", port); |
| 268 | } |
| 269 | |
| 270 | void parse_interface(const char *arg, char *vianame, unsigned char *mask) |
| 271 | { |
| 272 | int vialen = strlen(arg); |
| 273 | unsigned int i; |
| 274 | |
| 275 | memset(mask, 0, IFNAMSIZ); |
| 276 | memset(vianame, 0, IFNAMSIZ); |
| 277 | |
| 278 | if (vialen + 1 > IFNAMSIZ) |
| 279 | exit_error(PARAMETER_PROBLEM, |
| 280 | "interface name `%s' must be shorter than IFNAMSIZ" |
| 281 | " (%i)", arg, IFNAMSIZ-1); |
| 282 | |
| 283 | strcpy(vianame, arg); |
| 284 | if ((vialen == 0) || (vialen == 1 && vianame[0] == '+')) |
| 285 | memset(mask, 0, IFNAMSIZ); |
| 286 | else if (vianame[vialen - 1] == '+') { |
| 287 | memset(mask, 0xFF, vialen - 1); |
| 288 | memset(mask + vialen - 1, 0, IFNAMSIZ - vialen + 1); |
| 289 | /* Don't remove `+' here! -HW */ |
| 290 | } else { |
| 291 | /* Include nul-terminator in match */ |
| 292 | memset(mask, 0xFF, vialen + 1); |
| 293 | memset(mask + vialen + 1, 0, IFNAMSIZ - vialen - 1); |
| 294 | for (i = 0; vianame[i]; i++) { |
| 295 | if (vianame[i] == ':' || |
| 296 | vianame[i] == '!' || |
| 297 | vianame[i] == '*') { |
Max Kellermann | aae4f82 | 2007-10-17 16:36:49 +0000 | [diff] [blame] | 298 | fprintf(stderr, |
| 299 | "Warning: weird character in interface" |
| 300 | " `%s' (No aliases, :, ! or *).\n", |
| 301 | vianame); |
Yasuyuki KOZAKAI | 04f8c54 | 2007-07-24 05:53:48 +0000 | [diff] [blame] | 302 | break; |
| 303 | } |
| 304 | } |
| 305 | } |
| 306 | } |
| 307 | |
Jan Engelhardt | cb25af8 | 2008-04-14 18:37:57 +0200 | [diff] [blame] | 308 | #ifndef NO_SHARED_LIBS |
Jan Engelhardt | 21b41ee | 2008-02-11 01:02:00 +0100 | [diff] [blame] | 309 | static void *load_extension(const char *search_path, const char *prefix, |
| 310 | const char *name, bool is_target) |
| 311 | { |
| 312 | const char *dir = search_path, *next; |
| 313 | void *ptr = NULL; |
| 314 | struct stat sb; |
| 315 | char path[256]; |
| 316 | |
| 317 | do { |
| 318 | next = strchr(dir, ':'); |
| 319 | if (next == NULL) |
| 320 | next = dir + strlen(dir); |
| 321 | snprintf(path, sizeof(path), "%.*s/libxt_%s.so", |
Jan Engelhardt | 2c0a0c9 | 2008-04-14 15:58:17 +0200 | [diff] [blame] | 322 | (unsigned int)(next - dir), dir, name); |
Jan Engelhardt | 21b41ee | 2008-02-11 01:02:00 +0100 | [diff] [blame] | 323 | |
| 324 | if (dlopen(path, RTLD_NOW) != NULL) { |
| 325 | /* Found library. If it didn't register itself, |
| 326 | maybe they specified target as match. */ |
| 327 | if (is_target) |
| 328 | ptr = find_target(name, DONT_LOAD); |
| 329 | else |
| 330 | ptr = find_match(name, DONT_LOAD, NULL); |
| 331 | } else if (stat(path, &sb) == 0) { |
| 332 | fprintf(stderr, "%s: %s\n", path, dlerror()); |
| 333 | } |
| 334 | |
| 335 | if (ptr != NULL) |
| 336 | return ptr; |
| 337 | |
| 338 | snprintf(path, sizeof(path), "%.*s/%s%s.so", |
Jan Engelhardt | 2c0a0c9 | 2008-04-14 15:58:17 +0200 | [diff] [blame] | 339 | (unsigned int)(next - dir), dir, prefix, name); |
Jan Engelhardt | 21b41ee | 2008-02-11 01:02:00 +0100 | [diff] [blame] | 340 | if (dlopen(path, RTLD_NOW) != NULL) { |
| 341 | if (is_target) |
| 342 | ptr = find_target(name, DONT_LOAD); |
| 343 | else |
| 344 | ptr = find_match(name, DONT_LOAD, NULL); |
| 345 | } else if (stat(path, &sb) == 0) { |
| 346 | fprintf(stderr, "%s: %s\n", path, dlerror()); |
| 347 | } |
| 348 | |
| 349 | if (ptr != NULL) |
| 350 | return ptr; |
| 351 | |
| 352 | dir = next + 1; |
| 353 | } while (*next != '\0'); |
| 354 | |
| 355 | return NULL; |
| 356 | } |
Jan Engelhardt | cb25af8 | 2008-04-14 18:37:57 +0200 | [diff] [blame] | 357 | #endif |
Jan Engelhardt | 21b41ee | 2008-02-11 01:02:00 +0100 | [diff] [blame] | 358 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 359 | struct xtables_match *find_match(const char *name, enum xt_tryload tryload, |
| 360 | struct xtables_rule_match **matches) |
| 361 | { |
| 362 | struct xtables_match *ptr; |
| 363 | const char *icmp6 = "icmp6"; |
| 364 | |
| 365 | /* This is ugly as hell. Nonetheless, there is no way of changing |
| 366 | * this without hurting backwards compatibility */ |
| 367 | if ( (strcmp(name,"icmpv6") == 0) || |
| 368 | (strcmp(name,"ipv6-icmp") == 0) || |
| 369 | (strcmp(name,"icmp6") == 0) ) |
| 370 | name = icmp6; |
| 371 | |
| 372 | for (ptr = xtables_matches; ptr; ptr = ptr->next) { |
| 373 | if (strcmp(name, ptr->name) == 0) { |
| 374 | struct xtables_match *clone; |
| 375 | |
| 376 | /* First match of this type: */ |
| 377 | if (ptr->m == NULL) |
| 378 | break; |
| 379 | |
| 380 | /* Second and subsequent clones */ |
| 381 | clone = fw_malloc(sizeof(struct xtables_match)); |
| 382 | memcpy(clone, ptr, sizeof(struct xtables_match)); |
| 383 | clone->mflags = 0; |
| 384 | /* This is a clone: */ |
| 385 | clone->next = clone; |
| 386 | |
| 387 | ptr = clone; |
| 388 | break; |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | #ifndef NO_SHARED_LIBS |
| 393 | if (!ptr && tryload != DONT_LOAD && tryload != DURING_LOAD) { |
Jan Engelhardt | 21b41ee | 2008-02-11 01:02:00 +0100 | [diff] [blame] | 394 | ptr = load_extension(lib_dir, afinfo.libprefix, name, false); |
Yasuyuki KOZAKAI | 170af8c | 2007-08-04 05:22:17 +0000 | [diff] [blame] | 395 | |
| 396 | if (ptr == NULL && tryload == LOAD_MUST_SUCCEED) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 397 | exit_error(PARAMETER_PROBLEM, |
| 398 | "Couldn't load match `%s':%s\n", |
| 399 | name, dlerror()); |
| 400 | } |
| 401 | #else |
| 402 | if (ptr && !ptr->loaded) { |
| 403 | if (tryload != DONT_LOAD) |
| 404 | ptr->loaded = 1; |
| 405 | else |
| 406 | ptr = NULL; |
| 407 | } |
| 408 | if(!ptr && (tryload == LOAD_MUST_SUCCEED)) { |
| 409 | exit_error(PARAMETER_PROBLEM, |
| 410 | "Couldn't find match `%s'\n", name); |
| 411 | } |
| 412 | #endif |
| 413 | |
| 414 | if (ptr && matches) { |
| 415 | struct xtables_rule_match **i; |
| 416 | struct xtables_rule_match *newentry; |
| 417 | |
| 418 | newentry = fw_malloc(sizeof(struct xtables_rule_match)); |
| 419 | |
| 420 | for (i = matches; *i; i = &(*i)->next) { |
| 421 | if (strcmp(name, (*i)->match->name) == 0) |
| 422 | (*i)->completed = 1; |
| 423 | } |
| 424 | newentry->match = ptr; |
| 425 | newentry->completed = 0; |
| 426 | newentry->next = NULL; |
| 427 | *i = newentry; |
| 428 | } |
| 429 | |
| 430 | return ptr; |
| 431 | } |
| 432 | |
| 433 | |
| 434 | struct xtables_target *find_target(const char *name, enum xt_tryload tryload) |
| 435 | { |
| 436 | struct xtables_target *ptr; |
| 437 | |
| 438 | /* Standard target? */ |
| 439 | if (strcmp(name, "") == 0 |
| 440 | || strcmp(name, XTC_LABEL_ACCEPT) == 0 |
| 441 | || strcmp(name, XTC_LABEL_DROP) == 0 |
| 442 | || strcmp(name, XTC_LABEL_QUEUE) == 0 |
| 443 | || strcmp(name, XTC_LABEL_RETURN) == 0) |
| 444 | name = "standard"; |
| 445 | |
| 446 | for (ptr = xtables_targets; ptr; ptr = ptr->next) { |
| 447 | if (strcmp(name, ptr->name) == 0) |
| 448 | break; |
| 449 | } |
| 450 | |
| 451 | #ifndef NO_SHARED_LIBS |
| 452 | if (!ptr && tryload != DONT_LOAD && tryload != DURING_LOAD) { |
Jan Engelhardt | 21b41ee | 2008-02-11 01:02:00 +0100 | [diff] [blame] | 453 | ptr = load_extension(lib_dir, afinfo.libprefix, name, true); |
Yasuyuki KOZAKAI | 170af8c | 2007-08-04 05:22:17 +0000 | [diff] [blame] | 454 | |
Yasuyuki KOZAKAI | 170af8c | 2007-08-04 05:22:17 +0000 | [diff] [blame] | 455 | if (ptr == NULL && tryload == LOAD_MUST_SUCCEED) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 456 | exit_error(PARAMETER_PROBLEM, |
| 457 | "Couldn't load target `%s':%s\n", |
| 458 | name, dlerror()); |
| 459 | } |
| 460 | #else |
| 461 | if (ptr && !ptr->loaded) { |
| 462 | if (tryload != DONT_LOAD) |
| 463 | ptr->loaded = 1; |
| 464 | else |
| 465 | ptr = NULL; |
| 466 | } |
| 467 | if(!ptr && (tryload == LOAD_MUST_SUCCEED)) { |
| 468 | exit_error(PARAMETER_PROBLEM, |
| 469 | "Couldn't find target `%s'\n", name); |
| 470 | } |
| 471 | #endif |
| 472 | |
| 473 | if (ptr) |
| 474 | ptr->used = 1; |
| 475 | |
| 476 | return ptr; |
| 477 | } |
| 478 | |
| 479 | static int compatible_revision(const char *name, u_int8_t revision, int opt) |
| 480 | { |
| 481 | struct xt_get_revision rev; |
| 482 | socklen_t s = sizeof(rev); |
| 483 | int max_rev, sockfd; |
| 484 | |
| 485 | sockfd = socket(afinfo.family, SOCK_RAW, IPPROTO_RAW); |
| 486 | if (sockfd < 0) { |
Patrick McHardy | df1ef38 | 2007-12-03 15:32:28 +0000 | [diff] [blame] | 487 | if (errno == EPERM) { |
| 488 | /* revision 0 is always supported. */ |
| 489 | if (revision != 0) |
| 490 | fprintf(stderr, "Could not determine whether " |
| 491 | "revision %u is supported, " |
| 492 | "assuming it is.\n", |
| 493 | revision); |
| 494 | return 1; |
| 495 | } |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 496 | fprintf(stderr, "Could not open socket to kernel: %s\n", |
| 497 | strerror(errno)); |
| 498 | exit(1); |
| 499 | } |
| 500 | |
Jan Engelhardt | dbb7754 | 2008-02-11 00:33:30 +0100 | [diff] [blame] | 501 | load_xtables_ko(modprobe_program, 1); |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 502 | |
| 503 | strcpy(rev.name, name); |
| 504 | rev.revision = revision; |
| 505 | |
| 506 | max_rev = getsockopt(sockfd, afinfo.ipproto, opt, &rev, &s); |
| 507 | if (max_rev < 0) { |
| 508 | /* Definitely don't support this? */ |
| 509 | if (errno == ENOENT || errno == EPROTONOSUPPORT) { |
| 510 | close(sockfd); |
| 511 | return 0; |
| 512 | } else if (errno == ENOPROTOOPT) { |
| 513 | close(sockfd); |
| 514 | /* Assume only revision 0 support (old kernel) */ |
| 515 | return (revision == 0); |
| 516 | } else { |
| 517 | fprintf(stderr, "getsockopt failed strangely: %s\n", |
| 518 | strerror(errno)); |
| 519 | exit(1); |
| 520 | } |
| 521 | } |
| 522 | close(sockfd); |
| 523 | return 1; |
| 524 | } |
| 525 | |
| 526 | |
| 527 | static int compatible_match_revision(const char *name, u_int8_t revision) |
| 528 | { |
| 529 | return compatible_revision(name, revision, afinfo.so_rev_match); |
| 530 | } |
| 531 | |
| 532 | static int compatible_target_revision(const char *name, u_int8_t revision) |
| 533 | { |
| 534 | return compatible_revision(name, revision, afinfo.so_rev_target); |
| 535 | } |
| 536 | |
| 537 | void xtables_register_match(struct xtables_match *me) |
| 538 | { |
| 539 | struct xtables_match **i, *old; |
| 540 | |
| 541 | if (strcmp(me->version, program_version) != 0) { |
| 542 | fprintf(stderr, "%s: match `%s' v%s (I'm v%s).\n", |
| 543 | program_name, me->name, me->version, program_version); |
| 544 | exit(1); |
| 545 | } |
| 546 | |
| 547 | /* Revision field stole a char from name. */ |
| 548 | if (strlen(me->name) >= XT_FUNCTION_MAXNAMELEN-1) { |
| 549 | fprintf(stderr, "%s: target `%s' has invalid name\n", |
| 550 | program_name, me->name); |
| 551 | exit(1); |
| 552 | } |
| 553 | |
| 554 | if (me->family >= NPROTO) { |
| 555 | fprintf(stderr, |
| 556 | "%s: BUG: match %s has invalid protocol family\n", |
| 557 | program_name, me->name); |
| 558 | exit(1); |
| 559 | } |
| 560 | |
| 561 | /* ignore not interested match */ |
Jan Engelhardt | 23545c2 | 2008-02-14 04:23:04 +0100 | [diff] [blame] | 562 | if (me->family != afinfo.family && me->family != AF_UNSPEC) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 563 | return; |
| 564 | |
| 565 | old = find_match(me->name, DURING_LOAD, NULL); |
| 566 | if (old) { |
Jan Engelhardt | 23545c2 | 2008-02-14 04:23:04 +0100 | [diff] [blame] | 567 | if (old->revision == me->revision && |
| 568 | old->family == me->family) { |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 569 | fprintf(stderr, |
| 570 | "%s: match `%s' already registered.\n", |
| 571 | program_name, me->name); |
| 572 | exit(1); |
| 573 | } |
| 574 | |
| 575 | /* Now we have two (or more) options, check compatibility. */ |
| 576 | if (compatible_match_revision(old->name, old->revision) |
| 577 | && old->revision > me->revision) |
| 578 | return; |
| 579 | |
Jan Engelhardt | 23545c2 | 2008-02-14 04:23:04 +0100 | [diff] [blame] | 580 | /* See if new match can be used. */ |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 581 | if (!compatible_match_revision(me->name, me->revision)) |
| 582 | return; |
| 583 | |
Jan Engelhardt | 23545c2 | 2008-02-14 04:23:04 +0100 | [diff] [blame] | 584 | /* Prefer !AF_UNSPEC over AF_UNSPEC for same revision. */ |
| 585 | if (old->revision == me->revision && me->family == AF_UNSPEC) |
| 586 | return; |
| 587 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 588 | /* Delete old one. */ |
| 589 | for (i = &xtables_matches; *i!=old; i = &(*i)->next); |
| 590 | *i = old->next; |
| 591 | } |
| 592 | |
| 593 | if (me->size != XT_ALIGN(me->size)) { |
| 594 | fprintf(stderr, "%s: match `%s' has invalid size %u.\n", |
| 595 | program_name, me->name, (unsigned int)me->size); |
| 596 | exit(1); |
| 597 | } |
| 598 | |
| 599 | /* Append to list. */ |
| 600 | for (i = &xtables_matches; *i; i = &(*i)->next); |
| 601 | me->next = NULL; |
| 602 | *i = me; |
| 603 | |
| 604 | me->m = NULL; |
| 605 | me->mflags = 0; |
| 606 | } |
| 607 | |
| 608 | void xtables_register_target(struct xtables_target *me) |
| 609 | { |
| 610 | struct xtables_target *old; |
| 611 | |
| 612 | if (strcmp(me->version, program_version) != 0) { |
| 613 | fprintf(stderr, "%s: target `%s' v%s (I'm v%s).\n", |
| 614 | program_name, me->name, me->version, program_version); |
| 615 | exit(1); |
| 616 | } |
| 617 | |
| 618 | /* Revision field stole a char from name. */ |
| 619 | if (strlen(me->name) >= XT_FUNCTION_MAXNAMELEN-1) { |
| 620 | fprintf(stderr, "%s: target `%s' has invalid name\n", |
| 621 | program_name, me->name); |
| 622 | exit(1); |
| 623 | } |
| 624 | |
| 625 | if (me->family >= NPROTO) { |
| 626 | fprintf(stderr, |
| 627 | "%s: BUG: target %s has invalid protocol family\n", |
| 628 | program_name, me->name); |
| 629 | exit(1); |
| 630 | } |
| 631 | |
| 632 | /* ignore not interested target */ |
Jan Engelhardt | 23545c2 | 2008-02-14 04:23:04 +0100 | [diff] [blame] | 633 | if (me->family != afinfo.family && me->family != AF_UNSPEC) |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 634 | return; |
| 635 | |
| 636 | old = find_target(me->name, DURING_LOAD); |
| 637 | if (old) { |
| 638 | struct xtables_target **i; |
| 639 | |
Jan Engelhardt | 23545c2 | 2008-02-14 04:23:04 +0100 | [diff] [blame] | 640 | if (old->revision == me->revision && |
| 641 | old->family == me->family) { |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 642 | fprintf(stderr, |
| 643 | "%s: target `%s' already registered.\n", |
| 644 | program_name, me->name); |
| 645 | exit(1); |
| 646 | } |
| 647 | |
| 648 | /* Now we have two (or more) options, check compatibility. */ |
| 649 | if (compatible_target_revision(old->name, old->revision) |
| 650 | && old->revision > me->revision) |
| 651 | return; |
| 652 | |
Jan Engelhardt | 23545c2 | 2008-02-14 04:23:04 +0100 | [diff] [blame] | 653 | /* See if new target can be used. */ |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 654 | if (!compatible_target_revision(me->name, me->revision)) |
| 655 | return; |
| 656 | |
Jan Engelhardt | 23545c2 | 2008-02-14 04:23:04 +0100 | [diff] [blame] | 657 | /* Prefer !AF_UNSPEC over AF_UNSPEC for same revision. */ |
| 658 | if (old->revision == me->revision && me->family == AF_UNSPEC) |
| 659 | return; |
| 660 | |
Yasuyuki KOZAKAI | 0d502bc | 2007-07-24 05:52:07 +0000 | [diff] [blame] | 661 | /* Delete old one. */ |
| 662 | for (i = &xtables_targets; *i!=old; i = &(*i)->next); |
| 663 | *i = old->next; |
| 664 | } |
| 665 | |
| 666 | if (me->size != XT_ALIGN(me->size)) { |
| 667 | fprintf(stderr, "%s: target `%s' has invalid size %u.\n", |
| 668 | program_name, me->name, (unsigned int)me->size); |
| 669 | exit(1); |
| 670 | } |
| 671 | |
| 672 | /* Prepend to list. */ |
| 673 | me->next = xtables_targets; |
| 674 | xtables_targets = me; |
| 675 | me->t = NULL; |
| 676 | me->tflags = 0; |
| 677 | } |
Jan Engelhardt | aafd269 | 2008-01-20 13:19:40 +0000 | [diff] [blame] | 678 | |
| 679 | void param_act(unsigned int status, const char *p1, ...) |
| 680 | { |
| 681 | const char *p2, *p3; |
| 682 | va_list args; |
| 683 | bool b; |
| 684 | |
| 685 | va_start(args, p1); |
| 686 | |
| 687 | switch (status) { |
| 688 | case P_ONLY_ONCE: |
| 689 | p2 = va_arg(args, const char *); |
| 690 | b = va_arg(args, unsigned int); |
| 691 | if (!b) |
| 692 | return; |
| 693 | exit_error(PARAMETER_PROBLEM, |
| 694 | "%s: \"%s\" option may only be specified once", |
| 695 | p1, p2); |
| 696 | break; |
| 697 | case P_NO_INVERT: |
| 698 | p2 = va_arg(args, const char *); |
| 699 | b = va_arg(args, unsigned int); |
| 700 | if (!b) |
| 701 | return; |
| 702 | exit_error(PARAMETER_PROBLEM, |
| 703 | "%s: \"%s\" option cannot be inverted", p1, p2); |
| 704 | break; |
| 705 | case P_BAD_VALUE: |
| 706 | p2 = va_arg(args, const char *); |
| 707 | p3 = va_arg(args, const char *); |
| 708 | exit_error(PARAMETER_PROBLEM, |
| 709 | "%s: Bad value for \"%s\" option: \"%s\"", |
| 710 | p1, p2, p3); |
| 711 | break; |
| 712 | case P_ONE_ACTION: |
| 713 | b = va_arg(args, unsigned int); |
| 714 | if (!b) |
| 715 | return; |
| 716 | exit_error(PARAMETER_PROBLEM, |
| 717 | "%s: At most one action is possible", p1); |
| 718 | break; |
| 719 | default: |
| 720 | exit_error(status, p1, args); |
| 721 | break; |
| 722 | } |
| 723 | |
| 724 | va_end(args); |
| 725 | } |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 726 | |
| 727 | const char *ipaddr_to_numeric(const struct in_addr *addrp) |
| 728 | { |
| 729 | static char buf[20]; |
| 730 | const unsigned char *bytep = (const void *)&addrp->s_addr; |
| 731 | |
| 732 | sprintf(buf, "%u.%u.%u.%u", bytep[0], bytep[1], bytep[2], bytep[3]); |
| 733 | return buf; |
| 734 | } |
| 735 | |
| 736 | static const char *ipaddr_to_host(const struct in_addr *addr) |
| 737 | { |
| 738 | struct hostent *host; |
| 739 | |
| 740 | host = gethostbyaddr(addr, sizeof(struct in_addr), AF_INET); |
| 741 | if (host == NULL) |
| 742 | return NULL; |
| 743 | |
| 744 | return host->h_name; |
| 745 | } |
| 746 | |
| 747 | static const char *ipaddr_to_network(const struct in_addr *addr) |
| 748 | { |
| 749 | struct netent *net; |
| 750 | |
| 751 | if ((net = getnetbyaddr(ntohl(addr->s_addr), AF_INET)) != NULL) |
| 752 | return net->n_name; |
| 753 | |
| 754 | return NULL; |
| 755 | } |
| 756 | |
| 757 | const char *ipaddr_to_anyname(const struct in_addr *addr) |
| 758 | { |
| 759 | const char *name; |
| 760 | |
| 761 | if ((name = ipaddr_to_host(addr)) != NULL || |
| 762 | (name = ipaddr_to_network(addr)) != NULL) |
| 763 | return name; |
| 764 | |
| 765 | return ipaddr_to_numeric(addr); |
| 766 | } |
| 767 | |
| 768 | const char *ipmask_to_numeric(const struct in_addr *mask) |
| 769 | { |
| 770 | static char buf[20]; |
| 771 | uint32_t maskaddr, bits; |
| 772 | int i; |
| 773 | |
| 774 | maskaddr = ntohl(mask->s_addr); |
| 775 | |
| 776 | if (maskaddr == 0xFFFFFFFFL) |
| 777 | /* we don't want to see "/32" */ |
| 778 | return ""; |
| 779 | |
| 780 | i = 32; |
| 781 | bits = 0xFFFFFFFEL; |
| 782 | while (--i >= 0 && maskaddr != bits) |
| 783 | bits <<= 1; |
| 784 | if (i >= 0) |
| 785 | sprintf(buf, "/%d", i); |
| 786 | else |
| 787 | /* mask was not a decent combination of 1's and 0's */ |
| 788 | sprintf(buf, "/%s", ipaddr_to_numeric(mask)); |
| 789 | |
| 790 | return buf; |
| 791 | } |
| 792 | |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 793 | static struct in_addr *__numeric_to_ipaddr(const char *dotted, bool is_mask) |
| 794 | { |
| 795 | static struct in_addr addr; |
| 796 | unsigned char *addrp; |
| 797 | unsigned int onebyte; |
| 798 | char buf[20], *p, *q; |
| 799 | int i; |
| 800 | |
| 801 | /* copy dotted string, because we need to modify it */ |
| 802 | strncpy(buf, dotted, sizeof(buf) - 1); |
| 803 | buf[sizeof(buf) - 1] = '\0'; |
| 804 | addrp = (void *)&addr.s_addr; |
| 805 | |
| 806 | p = buf; |
| 807 | for (i = 0; i < 3; ++i) { |
| 808 | if ((q = strchr(p, '.')) == NULL) { |
| 809 | if (is_mask) |
| 810 | return NULL; |
| 811 | |
| 812 | /* autocomplete, this is a network address */ |
| 813 | if (!strtonum(p, NULL, &onebyte, 0, 255)) |
| 814 | return NULL; |
| 815 | |
| 816 | addrp[i] = onebyte; |
| 817 | while (i < 3) |
| 818 | addrp[++i] = 0; |
| 819 | |
| 820 | return &addr; |
| 821 | } |
| 822 | |
| 823 | *q = '\0'; |
| 824 | if (!strtonum(p, NULL, &onebyte, 0, 255)) |
| 825 | return NULL; |
| 826 | |
| 827 | addrp[i] = onebyte; |
| 828 | p = q + 1; |
| 829 | } |
| 830 | |
| 831 | /* we have checked 3 bytes, now we check the last one */ |
| 832 | if (!strtonum(p, NULL, &onebyte, 0, 255)) |
| 833 | return NULL; |
| 834 | |
| 835 | addrp[3] = onebyte; |
| 836 | return &addr; |
| 837 | } |
| 838 | |
| 839 | struct in_addr *numeric_to_ipaddr(const char *dotted) |
| 840 | { |
| 841 | return __numeric_to_ipaddr(dotted, false); |
| 842 | } |
| 843 | |
| 844 | struct in_addr *numeric_to_ipmask(const char *dotted) |
| 845 | { |
| 846 | return __numeric_to_ipaddr(dotted, true); |
| 847 | } |
| 848 | |
| 849 | static struct in_addr *network_to_ipaddr(const char *name) |
| 850 | { |
| 851 | static struct in_addr addr; |
| 852 | struct netent *net; |
| 853 | |
| 854 | if ((net = getnetbyname(name)) != NULL) { |
| 855 | if (net->n_addrtype != AF_INET) |
| 856 | return NULL; |
| 857 | addr.s_addr = htonl(net->n_net); |
| 858 | return &addr; |
| 859 | } |
| 860 | |
| 861 | return NULL; |
| 862 | } |
| 863 | |
| 864 | static struct in_addr *host_to_ipaddr(const char *name, unsigned int *naddr) |
| 865 | { |
| 866 | struct hostent *host; |
| 867 | struct in_addr *addr; |
| 868 | unsigned int i; |
| 869 | |
| 870 | *naddr = 0; |
| 871 | if ((host = gethostbyname(name)) != NULL) { |
| 872 | if (host->h_addrtype != AF_INET || |
| 873 | host->h_length != sizeof(struct in_addr)) |
| 874 | return NULL; |
| 875 | |
| 876 | while (host->h_addr_list[*naddr] != NULL) |
| 877 | ++*naddr; |
| 878 | addr = fw_calloc(*naddr, sizeof(struct in_addr) * *naddr); |
| 879 | for (i = 0; i < *naddr; i++) |
| 880 | memcpy(&addr[i], host->h_addr_list[i], |
| 881 | sizeof(struct in_addr)); |
| 882 | return addr; |
| 883 | } |
| 884 | |
| 885 | return NULL; |
| 886 | } |
| 887 | |
| 888 | static struct in_addr * |
| 889 | ipparse_hostnetwork(const char *name, unsigned int *naddrs) |
| 890 | { |
| 891 | struct in_addr *addrptmp, *addrp; |
| 892 | |
| 893 | if ((addrptmp = numeric_to_ipaddr(name)) != NULL || |
| 894 | (addrptmp = network_to_ipaddr(name)) != NULL) { |
| 895 | addrp = fw_malloc(sizeof(struct in_addr)); |
| 896 | memcpy(addrp, addrptmp, sizeof(*addrp)); |
| 897 | *naddrs = 1; |
| 898 | return addrp; |
| 899 | } |
| 900 | if ((addrptmp = host_to_ipaddr(name, naddrs)) != NULL) |
| 901 | return addrptmp; |
| 902 | |
| 903 | exit_error(PARAMETER_PROBLEM, "host/network `%s' not found", name); |
| 904 | } |
| 905 | |
| 906 | static struct in_addr *parse_ipmask(const char *mask) |
| 907 | { |
| 908 | static struct in_addr maskaddr; |
| 909 | struct in_addr *addrp; |
| 910 | unsigned int bits; |
| 911 | |
| 912 | if (mask == NULL) { |
| 913 | /* no mask at all defaults to 32 bits */ |
| 914 | maskaddr.s_addr = 0xFFFFFFFF; |
| 915 | return &maskaddr; |
| 916 | } |
| 917 | if ((addrp = numeric_to_ipmask(mask)) != NULL) |
| 918 | /* dotted_to_addr already returns a network byte order addr */ |
| 919 | return addrp; |
| 920 | if (string_to_number(mask, 0, 32, &bits) == -1) |
| 921 | exit_error(PARAMETER_PROBLEM, |
| 922 | "invalid mask `%s' specified", mask); |
| 923 | if (bits != 0) { |
| 924 | maskaddr.s_addr = htonl(0xFFFFFFFF << (32 - bits)); |
| 925 | return &maskaddr; |
| 926 | } |
| 927 | |
| 928 | maskaddr.s_addr = 0U; |
| 929 | return &maskaddr; |
| 930 | } |
| 931 | |
| 932 | void ipparse_hostnetworkmask(const char *name, struct in_addr **addrpp, |
| 933 | struct in_addr *maskp, unsigned int *naddrs) |
| 934 | { |
| 935 | unsigned int i, j, k, n; |
| 936 | struct in_addr *addrp; |
| 937 | char buf[256], *p; |
| 938 | |
| 939 | strncpy(buf, name, sizeof(buf) - 1); |
| 940 | buf[sizeof(buf) - 1] = '\0'; |
| 941 | if ((p = strrchr(buf, '/')) != NULL) { |
| 942 | *p = '\0'; |
| 943 | addrp = parse_ipmask(p + 1); |
| 944 | } else { |
| 945 | addrp = parse_ipmask(NULL); |
| 946 | } |
| 947 | memcpy(maskp, addrp, sizeof(*maskp)); |
| 948 | |
| 949 | /* if a null mask is given, the name is ignored, like in "any/0" */ |
| 950 | if (maskp->s_addr == 0U) |
| 951 | strcpy(buf, "0.0.0.0"); |
| 952 | |
| 953 | addrp = *addrpp = ipparse_hostnetwork(buf, naddrs); |
| 954 | n = *naddrs; |
| 955 | for (i = 0, j = 0; i < n; ++i) { |
| 956 | addrp[j++].s_addr &= maskp->s_addr; |
| 957 | for (k = 0; k < j - 1; ++k) |
| 958 | if (addrp[k].s_addr == addrp[j-1].s_addr) { |
| 959 | --*naddrs; |
| 960 | --j; |
| 961 | break; |
| 962 | } |
| 963 | } |
| 964 | } |
| 965 | |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 966 | const char *ip6addr_to_numeric(const struct in6_addr *addrp) |
| 967 | { |
| 968 | /* 0000:0000:0000:0000:0000:000.000.000.000 |
| 969 | * 0000:0000:0000:0000:0000:0000:0000:0000 */ |
| 970 | static char buf[50+1]; |
| 971 | return inet_ntop(AF_INET6, addrp, buf, sizeof(buf)); |
| 972 | } |
| 973 | |
| 974 | static const char *ip6addr_to_host(const struct in6_addr *addr) |
| 975 | { |
| 976 | static char hostname[NI_MAXHOST]; |
| 977 | struct sockaddr_in6 saddr; |
| 978 | int err; |
| 979 | |
| 980 | memset(&saddr, 0, sizeof(struct sockaddr_in6)); |
| 981 | memcpy(&saddr.sin6_addr, addr, sizeof(*addr)); |
| 982 | saddr.sin6_family = AF_INET6; |
| 983 | |
| 984 | err = getnameinfo((const void *)&saddr, sizeof(struct sockaddr_in6), |
| 985 | hostname, sizeof(hostname) - 1, NULL, 0, 0); |
| 986 | if (err != 0) { |
| 987 | #ifdef DEBUG |
| 988 | fprintf(stderr,"IP2Name: %s\n",gai_strerror(err)); |
| 989 | #endif |
| 990 | return NULL; |
| 991 | } |
| 992 | |
| 993 | #ifdef DEBUG |
| 994 | fprintf (stderr, "\naddr2host: %s\n", hostname); |
| 995 | #endif |
| 996 | return hostname; |
| 997 | } |
| 998 | |
| 999 | const char *ip6addr_to_anyname(const struct in6_addr *addr) |
| 1000 | { |
| 1001 | const char *name; |
| 1002 | |
| 1003 | if ((name = ip6addr_to_host(addr)) != NULL) |
| 1004 | return name; |
| 1005 | |
| 1006 | return ip6addr_to_numeric(addr); |
| 1007 | } |
| 1008 | |
| 1009 | static int ip6addr_prefix_length(const struct in6_addr *k) |
| 1010 | { |
| 1011 | unsigned int bits = 0; |
| 1012 | uint32_t a, b, c, d; |
| 1013 | |
Jan Engelhardt | 4860781 | 2008-06-10 15:17:53 +0200 | [diff] [blame^] | 1014 | a = ntohl(k->s6_addr32[0]); |
| 1015 | b = ntohl(k->s6_addr32[1]); |
| 1016 | c = ntohl(k->s6_addr32[2]); |
| 1017 | d = ntohl(k->s6_addr32[3]); |
Jan Engelhardt | 08b1616 | 2008-01-20 13:36:08 +0000 | [diff] [blame] | 1018 | while (a & 0x80000000U) { |
| 1019 | ++bits; |
| 1020 | a <<= 1; |
| 1021 | a |= (b >> 31) & 1; |
| 1022 | b <<= 1; |
| 1023 | b |= (c >> 31) & 1; |
| 1024 | c <<= 1; |
| 1025 | c |= (d >> 31) & 1; |
| 1026 | d <<= 1; |
| 1027 | } |
| 1028 | if (a != 0 || b != 0 || c != 0 || d != 0) |
| 1029 | return -1; |
| 1030 | return bits; |
| 1031 | } |
| 1032 | |
| 1033 | const char *ip6mask_to_numeric(const struct in6_addr *addrp) |
| 1034 | { |
| 1035 | static char buf[50+2]; |
| 1036 | int l = ip6addr_prefix_length(addrp); |
| 1037 | |
| 1038 | if (l == -1) { |
| 1039 | strcpy(buf, "/"); |
| 1040 | strcat(buf, ip6addr_to_numeric(addrp)); |
| 1041 | return buf; |
| 1042 | } |
| 1043 | sprintf(buf, "/%d", l); |
| 1044 | return buf; |
| 1045 | } |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1046 | |
| 1047 | struct in6_addr *numeric_to_ip6addr(const char *num) |
| 1048 | { |
| 1049 | static struct in6_addr ap; |
| 1050 | int err; |
| 1051 | |
| 1052 | if ((err = inet_pton(AF_INET6, num, &ap)) == 1) |
| 1053 | return ≈ |
| 1054 | #ifdef DEBUG |
| 1055 | fprintf(stderr, "\nnumeric2addr: %d\n", err); |
| 1056 | #endif |
| 1057 | return NULL; |
| 1058 | } |
| 1059 | |
| 1060 | static struct in6_addr * |
| 1061 | host_to_ip6addr(const char *name, unsigned int *naddr) |
| 1062 | { |
| 1063 | static struct in6_addr *addr; |
| 1064 | struct addrinfo hints; |
| 1065 | struct addrinfo *res; |
| 1066 | int err; |
| 1067 | |
| 1068 | memset(&hints, 0, sizeof(hints)); |
| 1069 | hints.ai_flags = AI_CANONNAME; |
| 1070 | hints.ai_family = AF_INET6; |
| 1071 | hints.ai_socktype = SOCK_RAW; |
| 1072 | hints.ai_protocol = IPPROTO_IPV6; |
| 1073 | hints.ai_next = NULL; |
| 1074 | |
| 1075 | *naddr = 0; |
| 1076 | if ((err = getaddrinfo(name, NULL, &hints, &res)) != 0) { |
| 1077 | #ifdef DEBUG |
| 1078 | fprintf(stderr,"Name2IP: %s\n",gai_strerror(err)); |
| 1079 | #endif |
| 1080 | return NULL; |
| 1081 | } else { |
| 1082 | if (res->ai_family != AF_INET6 || |
| 1083 | res->ai_addrlen != sizeof(struct sockaddr_in6)) |
| 1084 | return NULL; |
| 1085 | |
| 1086 | #ifdef DEBUG |
| 1087 | fprintf(stderr, "resolved: len=%d %s ", res->ai_addrlen, |
| 1088 | ip6addr_to_numeric(&((struct sockaddr_in6 *)res->ai_addr)->sin6_addr)); |
| 1089 | #endif |
| 1090 | /* Get the first element of the address-chain */ |
| 1091 | addr = fw_malloc(sizeof(struct in6_addr)); |
| 1092 | memcpy(addr, &((const struct sockaddr_in6 *)res->ai_addr)->sin6_addr, |
| 1093 | sizeof(struct in6_addr)); |
| 1094 | freeaddrinfo(res); |
| 1095 | *naddr = 1; |
| 1096 | return addr; |
| 1097 | } |
| 1098 | |
| 1099 | return NULL; |
| 1100 | } |
| 1101 | |
| 1102 | static struct in6_addr *network_to_ip6addr(const char *name) |
| 1103 | { |
| 1104 | /* abort();*/ |
| 1105 | /* TODO: not implemented yet, but the exception breaks the |
| 1106 | * name resolvation */ |
| 1107 | return NULL; |
| 1108 | } |
| 1109 | |
| 1110 | static struct in6_addr * |
| 1111 | ip6parse_hostnetwork(const char *name, unsigned int *naddrs) |
| 1112 | { |
| 1113 | struct in6_addr *addrp, *addrptmp; |
| 1114 | |
| 1115 | if ((addrptmp = numeric_to_ip6addr(name)) != NULL || |
| 1116 | (addrptmp = network_to_ip6addr(name)) != NULL) { |
| 1117 | addrp = fw_malloc(sizeof(struct in6_addr)); |
| 1118 | memcpy(addrp, addrptmp, sizeof(*addrp)); |
| 1119 | *naddrs = 1; |
| 1120 | return addrp; |
| 1121 | } |
| 1122 | if ((addrp = host_to_ip6addr(name, naddrs)) != NULL) |
| 1123 | return addrp; |
| 1124 | |
| 1125 | exit_error(PARAMETER_PROBLEM, "host/network `%s' not found", name); |
| 1126 | } |
| 1127 | |
| 1128 | static struct in6_addr *parse_ip6mask(char *mask) |
| 1129 | { |
| 1130 | static struct in6_addr maskaddr; |
| 1131 | struct in6_addr *addrp; |
| 1132 | unsigned int bits; |
| 1133 | |
| 1134 | if (mask == NULL) { |
| 1135 | /* no mask at all defaults to 128 bits */ |
| 1136 | memset(&maskaddr, 0xff, sizeof maskaddr); |
| 1137 | return &maskaddr; |
| 1138 | } |
| 1139 | if ((addrp = numeric_to_ip6addr(mask)) != NULL) |
| 1140 | return addrp; |
| 1141 | if (string_to_number(mask, 0, 128, &bits) == -1) |
| 1142 | exit_error(PARAMETER_PROBLEM, |
| 1143 | "invalid mask `%s' specified", mask); |
| 1144 | if (bits != 0) { |
| 1145 | char *p = (void *)&maskaddr; |
| 1146 | memset(p, 0xff, bits / 8); |
| 1147 | memset(p + (bits / 8) + 1, 0, (128 - bits) / 8); |
| 1148 | p[bits/8] = 0xff << (8 - (bits & 7)); |
| 1149 | return &maskaddr; |
| 1150 | } |
| 1151 | |
| 1152 | memset(&maskaddr, 0, sizeof(maskaddr)); |
| 1153 | return &maskaddr; |
| 1154 | } |
| 1155 | |
| 1156 | void ip6parse_hostnetworkmask(const char *name, struct in6_addr **addrpp, |
| 1157 | struct in6_addr *maskp, unsigned int *naddrs) |
| 1158 | { |
| 1159 | struct in6_addr *addrp; |
| 1160 | unsigned int i, j, k, n; |
| 1161 | char buf[256], *p; |
| 1162 | |
| 1163 | strncpy(buf, name, sizeof(buf) - 1); |
| 1164 | buf[sizeof(buf)-1] = '\0'; |
| 1165 | if ((p = strrchr(buf, '/')) != NULL) { |
| 1166 | *p = '\0'; |
| 1167 | addrp = parse_ip6mask(p + 1); |
| 1168 | } else { |
| 1169 | addrp = parse_ip6mask(NULL); |
| 1170 | } |
| 1171 | memcpy(maskp, addrp, sizeof(*maskp)); |
| 1172 | |
| 1173 | /* if a null mask is given, the name is ignored, like in "any/0" */ |
| 1174 | if (memcmp(maskp, &in6addr_any, sizeof(in6addr_any)) == 0) |
| 1175 | strcpy(buf, "::"); |
| 1176 | |
| 1177 | addrp = *addrpp = ip6parse_hostnetwork(buf, naddrs); |
| 1178 | n = *naddrs; |
| 1179 | for (i = 0, j = 0; i < n; ++i) { |
| 1180 | for (k = 0; k < 4; ++k) |
Yasuyuki Kozakai | 5a2208c | 2008-06-04 15:16:03 +0200 | [diff] [blame] | 1181 | addrp[j].s6_addr32[k] &= maskp->s6_addr32[k]; |
Jan Engelhardt | bd94384 | 2008-01-20 13:38:08 +0000 | [diff] [blame] | 1182 | ++j; |
| 1183 | for (k = 0; k < j - 1; ++k) |
| 1184 | if (IN6_ARE_ADDR_EQUAL(&addrp[k], &addrp[j - 1])) { |
| 1185 | --*naddrs; |
| 1186 | --j; |
| 1187 | break; |
| 1188 | } |
| 1189 | } |
| 1190 | } |
Max Kellermann | a5d0994 | 2008-01-29 13:44:34 +0000 | [diff] [blame] | 1191 | |
| 1192 | void save_string(const char *value) |
| 1193 | { |
| 1194 | static const char no_quote_chars[] = "_-0123456789" |
| 1195 | "abcdefghijklmnopqrstuvwxyz" |
| 1196 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
| 1197 | static const char escape_chars[] = "\"\\'"; |
| 1198 | size_t length; |
| 1199 | const char *p; |
| 1200 | |
| 1201 | length = strcspn(value, no_quote_chars); |
| 1202 | if (length > 0 && value[length] == 0) { |
| 1203 | /* no quoting required */ |
| 1204 | fputs(value, stdout); |
| 1205 | putchar(' '); |
| 1206 | } else { |
| 1207 | /* there is at least one dangerous character in the |
| 1208 | value, which we have to quote. Write double quotes |
| 1209 | around the value and escape special characters with |
| 1210 | a backslash */ |
| 1211 | putchar('"'); |
| 1212 | |
| 1213 | for (p = strpbrk(value, escape_chars); p != NULL; |
| 1214 | p = strpbrk(value, escape_chars)) { |
| 1215 | if (p > value) |
| 1216 | fwrite(value, 1, p - value, stdout); |
| 1217 | putchar('\\'); |
| 1218 | putchar(*p); |
| 1219 | value = p + 1; |
| 1220 | } |
| 1221 | |
| 1222 | /* print the rest and finish the double quoted |
| 1223 | string */ |
| 1224 | fputs(value, stdout); |
| 1225 | printf("\" "); |
| 1226 | } |
| 1227 | } |