Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 1 | /* Shared library add-on to iptables to add multiple TCP port support. */ |
| 2 | #include <stdio.h> |
| 3 | #include <netdb.h> |
| 4 | #include <string.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <getopt.h> |
| 7 | #include <ip6tables.h> |
Rémi Denis-Courmont | 0665217 | 2006-10-20 12:24:34 +0000 | [diff] [blame] | 8 | /* To ensure that iptables compiles with an old kernel */ |
| 9 | #include "../include/linux/netfilter_ipv6/ip6t_multiport.h" |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 10 | |
| 11 | /* Function which prints out usage message. */ |
| 12 | static void |
| 13 | help(void) |
| 14 | { |
| 15 | printf( |
| 16 | "multiport v%s options:\n" |
| 17 | " --source-ports port[,port,port...]\n" |
| 18 | " --sports ...\n" |
| 19 | " match source port(s)\n" |
| 20 | " --destination-ports port[,port,port...]\n" |
| 21 | " --dports ...\n" |
| 22 | " match destination port(s)\n" |
| 23 | " --ports port[,port,port]\n" |
Rémi Denis-Courmont | 0665217 | 2006-10-20 12:24:34 +0000 | [diff] [blame] | 24 | " match both source and destination port(s)\n" |
| 25 | " NOTE: this kernel does not support port ranges in multiport.\n", |
| 26 | IPTABLES_VERSION); |
| 27 | } |
| 28 | |
| 29 | static void |
| 30 | help_v1(void) |
| 31 | { |
| 32 | printf( |
| 33 | "multiport v%s options:\n" |
| 34 | " --source-ports [!] port[,port:port,port...]\n" |
| 35 | " --sports ...\n" |
| 36 | " match source port(s)\n" |
| 37 | " --destination-ports [!] port[,port:port,port...]\n" |
| 38 | " --dports ...\n" |
| 39 | " match destination port(s)\n" |
| 40 | " --ports [!] port[,port:port,port]\n" |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 41 | " match both source and destination port(s)\n", |
Harald Welte | 80fe35d | 2002-05-29 13:08:15 +0000 | [diff] [blame] | 42 | IPTABLES_VERSION); |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 43 | } |
| 44 | |
| 45 | static struct option opts[] = { |
| 46 | { "source-ports", 1, 0, '1' }, |
| 47 | { "sports", 1, 0, '1' }, /* synonym */ |
| 48 | { "destination-ports", 1, 0, '2' }, |
| 49 | { "dports", 1, 0, '2' }, /* synonym */ |
| 50 | { "ports", 1, 0, '3' }, |
| 51 | {0} |
| 52 | }; |
| 53 | |
Patrick McHardy | 2452baf | 2006-04-28 08:10:08 +0000 | [diff] [blame] | 54 | static char * |
| 55 | proto_to_name(u_int8_t proto) |
| 56 | { |
| 57 | switch (proto) { |
| 58 | case IPPROTO_TCP: |
| 59 | return "tcp"; |
| 60 | case IPPROTO_UDP: |
| 61 | return "udp"; |
| 62 | case IPPROTO_SCTP: |
| 63 | return "sctp"; |
| 64 | case IPPROTO_DCCP: |
| 65 | return "dccp"; |
| 66 | default: |
| 67 | return NULL; |
| 68 | } |
| 69 | } |
| 70 | |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 71 | static unsigned int |
| 72 | parse_multi_ports(const char *portstring, u_int16_t *ports, const char *proto) |
| 73 | { |
| 74 | char *buffer, *cp, *next; |
| 75 | unsigned int i; |
| 76 | |
| 77 | buffer = strdup(portstring); |
| 78 | if (!buffer) exit_error(OTHER_PROBLEM, "strdup failed"); |
| 79 | |
| 80 | for (cp=buffer, i=0; cp && i<IP6T_MULTI_PORTS; cp=next,i++) |
| 81 | { |
| 82 | next=strchr(cp, ','); |
| 83 | if (next) *next++='\0'; |
| 84 | ports[i] = parse_port(cp, proto); |
| 85 | } |
| 86 | if (cp) exit_error(PARAMETER_PROBLEM, "too many ports specified"); |
| 87 | free(buffer); |
| 88 | return i; |
| 89 | } |
| 90 | |
Rémi Denis-Courmont | 0665217 | 2006-10-20 12:24:34 +0000 | [diff] [blame] | 91 | static void |
| 92 | parse_multi_ports_v1(const char *portstring, |
| 93 | struct ip6t_multiport_v1 *multiinfo, |
| 94 | const char *proto) |
| 95 | { |
| 96 | char *buffer, *cp, *next, *range; |
| 97 | unsigned int i; |
| 98 | u_int16_t m; |
| 99 | |
| 100 | buffer = strdup(portstring); |
| 101 | if (!buffer) exit_error(OTHER_PROBLEM, "strdup failed"); |
| 102 | |
| 103 | for (i=0; i<IP6T_MULTI_PORTS; i++) |
| 104 | multiinfo->pflags[i] = 0; |
| 105 | |
| 106 | for (cp=buffer, i=0; cp && i<IP6T_MULTI_PORTS; cp=next, i++) { |
| 107 | next=strchr(cp, ','); |
| 108 | if (next) *next++='\0'; |
| 109 | range = strchr(cp, ':'); |
| 110 | if (range) { |
| 111 | if (i == IP6T_MULTI_PORTS-1) |
| 112 | exit_error(PARAMETER_PROBLEM, |
| 113 | "too many ports specified"); |
| 114 | *range++ = '\0'; |
| 115 | } |
| 116 | multiinfo->ports[i] = parse_port(cp, proto); |
| 117 | if (range) { |
| 118 | multiinfo->pflags[i] = 1; |
| 119 | multiinfo->ports[++i] = parse_port(range, proto); |
| 120 | if (multiinfo->ports[i-1] >= multiinfo->ports[i]) |
| 121 | exit_error(PARAMETER_PROBLEM, |
| 122 | "invalid portrange specified"); |
| 123 | m <<= 1; |
| 124 | } |
| 125 | } |
| 126 | multiinfo->count = i; |
| 127 | if (cp) exit_error(PARAMETER_PROBLEM, "too many ports specified"); |
| 128 | free(buffer); |
| 129 | } |
| 130 | |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 131 | /* Initialize the match. */ |
| 132 | static void |
| 133 | init(struct ip6t_entry_match *m, unsigned int *nfcache) |
| 134 | { |
| 135 | } |
| 136 | |
| 137 | static const char * |
| 138 | check_proto(const struct ip6t_entry *entry) |
| 139 | { |
Patrick McHardy | 2452baf | 2006-04-28 08:10:08 +0000 | [diff] [blame] | 140 | char *proto; |
| 141 | |
| 142 | if ((proto = proto_to_name(entry->ipv6.proto)) != NULL) |
| 143 | return proto; |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 144 | else if (!entry->ipv6.proto) |
| 145 | exit_error(PARAMETER_PROBLEM, |
Patrick McHardy | 2452baf | 2006-04-28 08:10:08 +0000 | [diff] [blame] | 146 | "multiport needs `-p tcp', `-p udp', `-p sctp' or `-p dccp'"); |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 147 | else |
| 148 | exit_error(PARAMETER_PROBLEM, |
Patrick McHardy | 2452baf | 2006-04-28 08:10:08 +0000 | [diff] [blame] | 149 | "multiport only works with TCP, UDP, SCTP and DCCP"); |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | /* Function which parses command options; returns true if it |
| 153 | ate an option */ |
| 154 | static int |
| 155 | parse(int c, char **argv, int invert, unsigned int *flags, |
| 156 | const struct ip6t_entry *entry, |
| 157 | unsigned int *nfcache, |
| 158 | struct ip6t_entry_match **match) |
| 159 | { |
| 160 | const char *proto; |
| 161 | struct ip6t_multiport *multiinfo |
| 162 | = (struct ip6t_multiport *)(*match)->data; |
| 163 | |
| 164 | switch (c) { |
| 165 | case '1': |
Patrick McHardy | d0a2e8a | 2004-09-18 17:43:36 +0000 | [diff] [blame] | 166 | check_inverse(argv[optind-1], &invert, &optind, 0); |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 167 | proto = check_proto(entry); |
| 168 | multiinfo->count = parse_multi_ports(argv[optind-1], |
| 169 | multiinfo->ports, proto); |
| 170 | multiinfo->flags = IP6T_MULTIPORT_SOURCE; |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 171 | break; |
| 172 | |
| 173 | case '2': |
Patrick McHardy | d0a2e8a | 2004-09-18 17:43:36 +0000 | [diff] [blame] | 174 | check_inverse(argv[optind-1], &invert, &optind, 0); |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 175 | proto = check_proto(entry); |
| 176 | multiinfo->count = parse_multi_ports(argv[optind-1], |
| 177 | multiinfo->ports, proto); |
| 178 | multiinfo->flags = IP6T_MULTIPORT_DESTINATION; |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 179 | break; |
| 180 | |
| 181 | case '3': |
Patrick McHardy | d0a2e8a | 2004-09-18 17:43:36 +0000 | [diff] [blame] | 182 | check_inverse(argv[optind-1], &invert, &optind, 0); |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 183 | proto = check_proto(entry); |
| 184 | multiinfo->count = parse_multi_ports(argv[optind-1], |
| 185 | multiinfo->ports, proto); |
| 186 | multiinfo->flags = IP6T_MULTIPORT_EITHER; |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 187 | break; |
| 188 | |
| 189 | default: |
| 190 | return 0; |
| 191 | } |
| 192 | |
Patrick McHardy | d0a2e8a | 2004-09-18 17:43:36 +0000 | [diff] [blame] | 193 | if (invert) |
| 194 | exit_error(PARAMETER_PROBLEM, |
| 195 | "multiport does not support invert"); |
| 196 | |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 197 | if (*flags) |
| 198 | exit_error(PARAMETER_PROBLEM, |
| 199 | "multiport can only have one option"); |
| 200 | *flags = 1; |
| 201 | return 1; |
| 202 | } |
| 203 | |
Rémi Denis-Courmont | 0665217 | 2006-10-20 12:24:34 +0000 | [diff] [blame] | 204 | static int |
| 205 | parse_v1(int c, char **argv, int invert, unsigned int *flags, |
| 206 | const struct ip6t_entry *entry, |
| 207 | unsigned int *nfcache, |
| 208 | struct ip6t_entry_match **match) |
| 209 | { |
| 210 | const char *proto; |
| 211 | struct ip6t_multiport_v1 *multiinfo |
| 212 | = (struct ip6t_multiport_v1 *)(*match)->data; |
| 213 | |
| 214 | switch (c) { |
| 215 | case '1': |
| 216 | check_inverse(argv[optind-1], &invert, &optind, 0); |
| 217 | proto = check_proto(entry); |
| 218 | parse_multi_ports_v1(argv[optind-1], multiinfo, proto); |
| 219 | multiinfo->flags = IP6T_MULTIPORT_SOURCE; |
| 220 | break; |
| 221 | |
| 222 | case '2': |
| 223 | check_inverse(argv[optind-1], &invert, &optind, 0); |
| 224 | proto = check_proto(entry); |
| 225 | parse_multi_ports_v1(argv[optind-1], multiinfo, proto); |
| 226 | multiinfo->flags = IP6T_MULTIPORT_DESTINATION; |
| 227 | break; |
| 228 | |
| 229 | case '3': |
| 230 | check_inverse(argv[optind-1], &invert, &optind, 0); |
| 231 | proto = check_proto(entry); |
| 232 | parse_multi_ports_v1(argv[optind-1], multiinfo, proto); |
| 233 | multiinfo->flags = IP6T_MULTIPORT_EITHER; |
| 234 | break; |
| 235 | |
| 236 | default: |
| 237 | return 0; |
| 238 | } |
| 239 | |
| 240 | if (invert) |
| 241 | multiinfo->invert = 1; |
| 242 | |
| 243 | if (*flags) |
| 244 | exit_error(PARAMETER_PROBLEM, |
| 245 | "multiport can only have one option"); |
| 246 | *flags = 1; |
| 247 | return 1; |
| 248 | } |
| 249 | |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 250 | /* Final check; must specify something. */ |
| 251 | static void |
| 252 | final_check(unsigned int flags) |
| 253 | { |
| 254 | if (!flags) |
| 255 | exit_error(PARAMETER_PROBLEM, "multiport expection an option"); |
| 256 | } |
| 257 | |
| 258 | static char * |
| 259 | port_to_service(int port, u_int8_t proto) |
| 260 | { |
| 261 | struct servent *service; |
| 262 | |
Patrick McHardy | 2452baf | 2006-04-28 08:10:08 +0000 | [diff] [blame] | 263 | if ((service = getservbyport(htons(port), proto_to_name(proto)))) |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 264 | return service->s_name; |
| 265 | |
| 266 | return NULL; |
| 267 | } |
| 268 | |
| 269 | static void |
| 270 | print_port(u_int16_t port, u_int8_t protocol, int numeric) |
| 271 | { |
| 272 | char *service; |
| 273 | |
| 274 | if (numeric || (service = port_to_service(port, protocol)) == NULL) |
| 275 | printf("%u", port); |
| 276 | else |
| 277 | printf("%s", service); |
| 278 | } |
| 279 | |
| 280 | /* Prints out the matchinfo. */ |
| 281 | static void |
| 282 | print(const struct ip6t_ip6 *ip, |
| 283 | const struct ip6t_entry_match *match, |
| 284 | int numeric) |
| 285 | { |
| 286 | const struct ip6t_multiport *multiinfo |
| 287 | = (const struct ip6t_multiport *)match->data; |
| 288 | unsigned int i; |
| 289 | |
| 290 | printf("multiport "); |
| 291 | |
| 292 | switch (multiinfo->flags) { |
| 293 | case IP6T_MULTIPORT_SOURCE: |
| 294 | printf("sports "); |
| 295 | break; |
| 296 | |
| 297 | case IP6T_MULTIPORT_DESTINATION: |
| 298 | printf("dports "); |
| 299 | break; |
| 300 | |
| 301 | case IP6T_MULTIPORT_EITHER: |
| 302 | printf("ports "); |
| 303 | break; |
| 304 | |
| 305 | default: |
| 306 | printf("ERROR "); |
| 307 | break; |
| 308 | } |
| 309 | |
| 310 | for (i=0; i < multiinfo->count; i++) { |
| 311 | printf("%s", i ? "," : ""); |
| 312 | print_port(multiinfo->ports[i], ip->proto, numeric); |
| 313 | } |
| 314 | printf(" "); |
| 315 | } |
| 316 | |
Rémi Denis-Courmont | 0665217 | 2006-10-20 12:24:34 +0000 | [diff] [blame] | 317 | static void |
| 318 | print_v1(const struct ip6t_ip6 *ip, |
| 319 | const struct ip6t_entry_match *match, |
| 320 | int numeric) |
| 321 | { |
| 322 | const struct ip6t_multiport_v1 *multiinfo |
| 323 | = (const struct ip6t_multiport_v1 *)match->data; |
| 324 | unsigned int i; |
| 325 | |
| 326 | printf("multiport "); |
| 327 | |
| 328 | switch (multiinfo->flags) { |
| 329 | case IP6T_MULTIPORT_SOURCE: |
| 330 | printf("sports "); |
| 331 | break; |
| 332 | |
| 333 | case IP6T_MULTIPORT_DESTINATION: |
| 334 | printf("dports "); |
| 335 | break; |
| 336 | |
| 337 | case IP6T_MULTIPORT_EITHER: |
| 338 | printf("ports "); |
| 339 | break; |
| 340 | |
| 341 | default: |
| 342 | printf("ERROR "); |
| 343 | break; |
| 344 | } |
| 345 | |
| 346 | if (multiinfo->invert) |
| 347 | printf("! "); |
| 348 | |
| 349 | for (i=0; i < multiinfo->count; i++) { |
| 350 | printf("%s", i ? "," : ""); |
| 351 | print_port(multiinfo->ports[i], ip->proto, numeric); |
| 352 | if (multiinfo->pflags[i]) { |
| 353 | printf(":"); |
| 354 | print_port(multiinfo->ports[++i], ip->proto, numeric); |
| 355 | } |
| 356 | } |
| 357 | printf(" "); |
| 358 | } |
| 359 | |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 360 | /* Saves the union ip6t_matchinfo in parsable form to stdout. */ |
| 361 | static void save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match) |
| 362 | { |
| 363 | const struct ip6t_multiport *multiinfo |
| 364 | = (const struct ip6t_multiport *)match->data; |
| 365 | unsigned int i; |
| 366 | |
| 367 | switch (multiinfo->flags) { |
| 368 | case IP6T_MULTIPORT_SOURCE: |
| 369 | printf("--sports "); |
| 370 | break; |
| 371 | |
| 372 | case IP6T_MULTIPORT_DESTINATION: |
| 373 | printf("--dports "); |
| 374 | break; |
| 375 | |
| 376 | case IP6T_MULTIPORT_EITHER: |
| 377 | printf("--ports "); |
| 378 | break; |
| 379 | } |
| 380 | |
| 381 | for (i=0; i < multiinfo->count; i++) { |
| 382 | printf("%s", i ? "," : ""); |
Thomas Woerner | 01cbaa6 | 2003-07-14 20:01:29 +0000 | [diff] [blame] | 383 | print_port(multiinfo->ports[i], ip->proto, 1); |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 384 | } |
| 385 | printf(" "); |
| 386 | } |
| 387 | |
Rémi Denis-Courmont | 0665217 | 2006-10-20 12:24:34 +0000 | [diff] [blame] | 388 | static void save_v1(const struct ip6t_ip6 *ip, |
| 389 | const struct ip6t_entry_match *match) |
| 390 | { |
| 391 | const struct ip6t_multiport_v1 *multiinfo |
| 392 | = (const struct ip6t_multiport_v1 *)match->data; |
| 393 | unsigned int i; |
| 394 | |
| 395 | switch (multiinfo->flags) { |
| 396 | case IP6T_MULTIPORT_SOURCE: |
| 397 | printf("--sports "); |
| 398 | break; |
| 399 | |
| 400 | case IP6T_MULTIPORT_DESTINATION: |
| 401 | printf("--dports "); |
| 402 | break; |
| 403 | |
| 404 | case IP6T_MULTIPORT_EITHER: |
| 405 | printf("--ports "); |
| 406 | break; |
| 407 | } |
| 408 | |
| 409 | if (multiinfo->invert) |
| 410 | printf("! "); |
| 411 | |
| 412 | for (i=0; i < multiinfo->count; i++) { |
| 413 | printf("%s", i ? "," : ""); |
| 414 | print_port(multiinfo->ports[i], ip->proto, 1); |
| 415 | if (multiinfo->pflags[i]) { |
| 416 | printf(":"); |
| 417 | print_port(multiinfo->ports[++i], ip->proto, 1); |
| 418 | } |
| 419 | } |
| 420 | printf(" "); |
| 421 | } |
| 422 | |
Harald Welte | 02aa733 | 2005-02-01 15:38:20 +0000 | [diff] [blame] | 423 | static struct ip6tables_match multiport = { |
| 424 | .name = "multiport", |
| 425 | .version = IPTABLES_VERSION, |
| 426 | .size = IP6T_ALIGN(sizeof(struct ip6t_multiport)), |
| 427 | .userspacesize = IP6T_ALIGN(sizeof(struct ip6t_multiport)), |
| 428 | .help = &help, |
| 429 | .init = &init, |
Harald Welte | 3d12187 | 2005-02-01 15:41:07 +0000 | [diff] [blame] | 430 | .parse = &parse, |
Harald Welte | 02aa733 | 2005-02-01 15:38:20 +0000 | [diff] [blame] | 431 | .final_check = &final_check, |
| 432 | .print = &print, |
| 433 | .save = &save, |
| 434 | .extra_opts = opts, |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 435 | }; |
| 436 | |
Rémi Denis-Courmont | 0665217 | 2006-10-20 12:24:34 +0000 | [diff] [blame] | 437 | static struct ip6tables_match multiport_v1 = { |
| 438 | .next = NULL, |
| 439 | .name = "multiport", |
| 440 | .revision = 1, |
| 441 | .version = IPTABLES_VERSION, |
| 442 | .size = IP6T_ALIGN(sizeof(struct ip6t_multiport_v1)), |
| 443 | .userspacesize = IP6T_ALIGN(sizeof(struct ip6t_multiport_v1)), |
| 444 | .help = &help_v1, |
| 445 | .init = &init, |
| 446 | .parse = &parse_v1, |
| 447 | .final_check = &final_check, |
| 448 | .print = &print_v1, |
| 449 | .save = &save_v1, |
| 450 | .extra_opts = opts |
| 451 | }; |
| 452 | |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 453 | void |
| 454 | _init(void) |
| 455 | { |
| 456 | register_match6(&multiport); |
Rémi Denis-Courmont | 0665217 | 2006-10-20 12:24:34 +0000 | [diff] [blame] | 457 | register_match6(&multiport_v1); |
Jan Rekorajski | dc8af0f | 2001-02-16 15:19:51 +0000 | [diff] [blame] | 458 | } |