+++ /dev/null
-/* Shared library add-on to iptables for DCCP matching
- *
- * (C) 2005 by Harald Welte <laforge@netfilter.org>
- *
- * This program is distributed under the terms of GNU GPL v2, 1991
- *
- */
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <getopt.h>
-#include <netdb.h>
-#include <ctype.h>
-
-#include <xtables.h>
-#include <linux/dccp.h>
-#include <linux/netfilter/x_tables.h>
-#include <linux/netfilter/xt_dccp.h>
-
-#if 0
-#define DEBUGP(format, first...) printf(format, ##first)
-#define static
-#else
-#define DEBUGP(format, fist...)
-#endif
-
-/* Initialize the match. */
-static void dccp_init(struct xt_entry_match *m)
-{
- struct xt_dccp_info *einfo = (struct xt_dccp_info *)m->data;
-
- memset(einfo, 0, sizeof(struct xt_dccp_info));
-}
-
-static void dccp_help(void)
-{
- printf(
-"dccp match options\n"
-" --source-port [!] port[:port] match source port(s)\n"
-" --sport ...\n"
-" --destination-port [!] port[:port] match destination port(s)\n"
-" --dport ...\n");
-}
-
-static const struct option dccp_opts[] = {
- { .name = "source-port", .has_arg = 1, .val = '1' },
- { .name = "sport", .has_arg = 1, .val = '1' },
- { .name = "destination-port", .has_arg = 1, .val = '2' },
- { .name = "dport", .has_arg = 1, .val = '2' },
- { .name = "dccp-types", .has_arg = 1, .val = '3' },
- { .name = "dccp-option", .has_arg = 1, .val = '4' },
- { .name = NULL }
-};
-
-static void
-parse_dccp_ports(const char *portstring,
- u_int16_t *ports)
-{
- char *buffer;
- char *cp;
-
- buffer = strdup(portstring);
- DEBUGP("%s\n", portstring);
- if ((cp = strchr(buffer, ':')) == NULL) {
- ports[0] = ports[1] = parse_port(buffer, "dccp");
- }
- else {
- *cp = '\0';
- cp++;
-
- ports[0] = buffer[0] ? parse_port(buffer, "dccp") : 0;
- ports[1] = cp[0] ? parse_port(cp, "dccp") : 0xFFFF;
-
- if (ports[0] > ports[1])
- exit_error(PARAMETER_PROBLEM,
- "invalid portrange (min > max)");
- }
- free(buffer);
-}
-
-static const char *const dccp_pkt_types[] = {
- [DCCP_PKT_REQUEST] = "REQUEST",
- [DCCP_PKT_RESPONSE] = "RESPONSE",
- [DCCP_PKT_DATA] = "DATA",
- [DCCP_PKT_ACK] = "ACK",
- [DCCP_PKT_DATAACK] = "DATAACK",
- [DCCP_PKT_CLOSEREQ] = "CLOSEREQ",
- [DCCP_PKT_CLOSE] = "CLOSE",
- [DCCP_PKT_RESET] = "RESET",
- [DCCP_PKT_SYNC] = "SYNC",
- [DCCP_PKT_SYNCACK] = "SYNCACK",
- [DCCP_PKT_INVALID] = "INVALID",
-};
-
-static u_int16_t
-parse_dccp_types(const char *typestring)
-{
- u_int16_t typemask = 0;
- char *ptr, *buffer;
-
- buffer = strdup(typestring);
-
- for (ptr = strtok(buffer, ","); ptr; ptr = strtok(NULL, ",")) {
- unsigned int i;
- for (i = 0; i < sizeof(dccp_pkt_types)/sizeof(char *); i++) {
- if (!strcasecmp(dccp_pkt_types[i], ptr)) {
- typemask |= (1 << i);
- break;
- }
- }
- if (i == sizeof(dccp_pkt_types)/sizeof(char *))
- exit_error(PARAMETER_PROBLEM,
- "Unknown DCCP type `%s'", ptr);
- }
-
- free(buffer);
- return typemask;
-}
-
-static u_int8_t parse_dccp_option(char *optstring)
-{
- unsigned int ret;
-
- if (string_to_number(optstring, 1, 255, &ret) == -1)
- exit_error(PARAMETER_PROBLEM, "Bad DCCP option `%s'",
- optstring);
-
- return (u_int8_t)ret;
-}
-
-static int
-dccp_parse(int c, char **argv, int invert, unsigned int *flags,
- const void *entry, struct xt_entry_match **match)
-{
- struct xt_dccp_info *einfo
- = (struct xt_dccp_info *)(*match)->data;
-
- switch (c) {
- case '1':
- if (*flags & XT_DCCP_SRC_PORTS)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--source-port' allowed");
- einfo->flags |= XT_DCCP_SRC_PORTS;
- check_inverse(optarg, &invert, &optind, 0);
- parse_dccp_ports(argv[optind-1], einfo->spts);
- if (invert)
- einfo->invflags |= XT_DCCP_SRC_PORTS;
- *flags |= XT_DCCP_SRC_PORTS;
- break;
-
- case '2':
- if (*flags & XT_DCCP_DEST_PORTS)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--destination-port' allowed");
- einfo->flags |= XT_DCCP_DEST_PORTS;
- check_inverse(optarg, &invert, &optind, 0);
- parse_dccp_ports(argv[optind-1], einfo->dpts);
- if (invert)
- einfo->invflags |= XT_DCCP_DEST_PORTS;
- *flags |= XT_DCCP_DEST_PORTS;
- break;
-
- case '3':
- if (*flags & XT_DCCP_TYPE)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--dccp-types' allowed");
- einfo->flags |= XT_DCCP_TYPE;
- check_inverse(optarg, &invert, &optind, 0);
- einfo->typemask = parse_dccp_types(argv[optind-1]);
- if (invert)
- einfo->invflags |= XT_DCCP_TYPE;
- *flags |= XT_DCCP_TYPE;
- break;
-
- case '4':
- if (*flags & XT_DCCP_OPTION)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--dccp-option' allowed");
- einfo->flags |= XT_DCCP_OPTION;
- check_inverse(optarg, &invert, &optind, 0);
- einfo->option = parse_dccp_option(argv[optind-1]);
- if (invert)
- einfo->invflags |= XT_DCCP_OPTION;
- *flags |= XT_DCCP_OPTION;
- break;
- default:
- return 0;
- }
- return 1;
-}
-
-static char *
-port_to_service(int port)
-{
- struct servent *service;
-
- if ((service = getservbyport(htons(port), "dccp")))
- return service->s_name;
-
- return NULL;
-}
-
-static void
-print_port(u_int16_t port, int numeric)
-{
- char *service;
-
- if (numeric || (service = port_to_service(port)) == NULL)
- printf("%u", port);
- else
- printf("%s", service);
-}
-
-static void
-print_ports(const char *name, u_int16_t min, u_int16_t max,
- int invert, int numeric)
-{
- const char *inv = invert ? "!" : "";
-
- if (min != 0 || max != 0xFFFF || invert) {
- printf("%s", name);
- if (min == max) {
- printf(":%s", inv);
- print_port(min, numeric);
- } else {
- printf("s:%s", inv);
- print_port(min, numeric);
- printf(":");
- print_port(max, numeric);
- }
- printf(" ");
- }
-}
-
-static void
-print_types(u_int16_t types, int inverted, int numeric)
-{
- int have_type = 0;
-
- if (inverted)
- printf("! ");
-
- while (types) {
- unsigned int i;
-
- for (i = 0; !(types & (1 << i)); i++);
-
- if (have_type)
- printf(",");
- else
- have_type = 1;
-
- if (numeric)
- printf("%u", i);
- else
- printf("%s", dccp_pkt_types[i]);
-
- types &= ~(1 << i);
- }
-}
-
-static void
-print_option(u_int8_t option, int invert, int numeric)
-{
- if (option || invert)
- printf("option=%s%u ", invert ? "!" : "", option);
-}
-
-/* Prints out the matchinfo. */
-static void
-dccp_print(const void *ip, const struct xt_entry_match *match, int numeric)
-{
- const struct xt_dccp_info *einfo =
- (const struct xt_dccp_info *)match->data;
-
- printf("dccp ");
-
- if (einfo->flags & XT_DCCP_SRC_PORTS) {
- print_ports("spt", einfo->spts[0], einfo->spts[1],
- einfo->invflags & XT_DCCP_SRC_PORTS,
- numeric);
- }
-
- if (einfo->flags & XT_DCCP_DEST_PORTS) {
- print_ports("dpt", einfo->dpts[0], einfo->dpts[1],
- einfo->invflags & XT_DCCP_DEST_PORTS,
- numeric);
- }
-
- if (einfo->flags & XT_DCCP_TYPE) {
- print_types(einfo->typemask,
- einfo->invflags & XT_DCCP_TYPE,
- numeric);
- }
-
- if (einfo->flags & XT_DCCP_OPTION) {
- print_option(einfo->option,
- einfo->invflags & XT_DCCP_OPTION, numeric);
- }
-}
-
-/* Saves the union ipt_matchinfo in parsable form to stdout. */
-static void dccp_save(const void *ip, const struct xt_entry_match *match)
-{
- const struct xt_dccp_info *einfo =
- (const struct xt_dccp_info *)match->data;
-
- if (einfo->flags & XT_DCCP_SRC_PORTS) {
- if (einfo->invflags & XT_DCCP_SRC_PORTS)
- printf("! ");
- if (einfo->spts[0] != einfo->spts[1])
- printf("--sport %u:%u ",
- einfo->spts[0], einfo->spts[1]);
- else
- printf("--sport %u ", einfo->spts[0]);
- }
-
- if (einfo->flags & XT_DCCP_DEST_PORTS) {
- if (einfo->invflags & XT_DCCP_DEST_PORTS)
- printf("! ");
- if (einfo->dpts[0] != einfo->dpts[1])
- printf("--dport %u:%u ",
- einfo->dpts[0], einfo->dpts[1]);
- else
- printf("--dport %u ", einfo->dpts[0]);
- }
-
- if (einfo->flags & XT_DCCP_TYPE) {
- printf("--dccp-type ");
- print_types(einfo->typemask, einfo->invflags & XT_DCCP_TYPE,0);
- }
-
- if (einfo->flags & XT_DCCP_OPTION) {
- printf("--dccp-option %s%u ",
- einfo->typemask & XT_DCCP_OPTION ? "! " : "",
- einfo->option);
- }
-}
-
-static struct xtables_match dccp_match = {
- .name = "dccp",
- .family = AF_INET,
- .version = XTABLES_VERSION,
- .size = XT_ALIGN(sizeof(struct xt_dccp_info)),
- .userspacesize = XT_ALIGN(sizeof(struct xt_dccp_info)),
- .help = dccp_help,
- .init = dccp_init,
- .parse = dccp_parse,
- .print = dccp_print,
- .save = dccp_save,
- .extra_opts = dccp_opts,
-};
-
-static struct xtables_match dccp_match6 = {
- .name = "dccp",
- .family = AF_INET6,
- .version = XTABLES_VERSION,
- .size = XT_ALIGN(sizeof(struct xt_dccp_info)),
- .userspacesize = XT_ALIGN(sizeof(struct xt_dccp_info)),
- .help = dccp_help,
- .init = dccp_init,
- .parse = dccp_parse,
- .print = dccp_print,
- .save = dccp_save,
- .extra_opts = dccp_opts,
-};
-
-void _init(void)
-{
- xtables_register_match(&dccp_match);
- xtables_register_match(&dccp_match6);
-}
-
git://git.onelab.eu / iptables.git / blobdiff