+++ /dev/null
-/* Shared library add-on to iptables to add UDP support. */
-#include <stdio.h>
-#include <netdb.h>
-#include <string.h>
-#include <stdlib.h>
-#include <getopt.h>
-#include <xtables.h>
-#include <linux/netfilter/xt_tcpudp.h>
-
-/* Function which prints out usage message. */
-static void udp_help(void)
-{
- printf(
-"udp match options:\n"
-" --source-port [!] port[:port]\n"
-" --sport ...\n"
-" match source port(s)\n"
-" --destination-port [!] port[:port]\n"
-" --dport ...\n"
-" match destination port(s)\n");
-}
-
-static const struct option udp_opts[] = {
- { "source-port", 1, NULL, '1' },
- { "sport", 1, NULL, '1' }, /* synonym */
- { "destination-port", 1, NULL, '2' },
- { "dport", 1, NULL, '2' }, /* synonym */
- { .name = NULL }
-};
-
-static void
-parse_udp_ports(const char *portstring, u_int16_t *ports)
-{
- char *buffer;
- char *cp;
-
- buffer = strdup(portstring);
- if ((cp = strchr(buffer, ':')) == NULL)
- ports[0] = ports[1] = parse_port(buffer, "udp");
- else {
- *cp = '\0';
- cp++;
-
- ports[0] = buffer[0] ? parse_port(buffer, "udp") : 0;
- ports[1] = cp[0] ? parse_port(cp, "udp") : 0xFFFF;
-
- if (ports[0] > ports[1])
- exit_error(PARAMETER_PROBLEM,
- "invalid portrange (min > max)");
- }
- free(buffer);
-}
-
-/* Initialize the match. */
-static void udp_init(struct xt_entry_match *m)
-{
- struct xt_udp *udpinfo = (struct xt_udp *)m->data;
-
- udpinfo->spts[1] = udpinfo->dpts[1] = 0xFFFF;
-}
-
-#define UDP_SRC_PORTS 0x01
-#define UDP_DST_PORTS 0x02
-
-/* Function which parses command options; returns true if it
- ate an option */
-static int
-udp_parse(int c, char **argv, int invert, unsigned int *flags,
- const void *entry, struct xt_entry_match **match)
-{
- struct xt_udp *udpinfo = (struct xt_udp *)(*match)->data;
-
- switch (c) {
- case '1':
- if (*flags & UDP_SRC_PORTS)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--source-port' allowed");
- check_inverse(optarg, &invert, &optind, 0);
- parse_udp_ports(argv[optind-1], udpinfo->spts);
- if (invert)
- udpinfo->invflags |= XT_UDP_INV_SRCPT;
- *flags |= UDP_SRC_PORTS;
- break;
-
- case '2':
- if (*flags & UDP_DST_PORTS)
- exit_error(PARAMETER_PROBLEM,
- "Only one `--destination-port' allowed");
- check_inverse(optarg, &invert, &optind, 0);
- parse_udp_ports(argv[optind-1], udpinfo->dpts);
- if (invert)
- udpinfo->invflags |= XT_UDP_INV_DSTPT;
- *flags |= UDP_DST_PORTS;
- break;
-
- default:
- return 0;
- }
-
- return 1;
-}
-
-static char *
-port_to_service(int port)
-{
- struct servent *service;
-
- if ((service = getservbyport(htons(port), "udp")))
- 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(" ");
- }
-}
-
-/* Prints out the union ipt_matchinfo. */
-static void
-udp_print(const void *ip, const struct xt_entry_match *match, int numeric)
-{
- const struct xt_udp *udp = (struct xt_udp *)match->data;
-
- printf("udp ");
- print_ports("spt", udp->spts[0], udp->spts[1],
- udp->invflags & XT_UDP_INV_SRCPT,
- numeric);
- print_ports("dpt", udp->dpts[0], udp->dpts[1],
- udp->invflags & XT_UDP_INV_DSTPT,
- numeric);
- if (udp->invflags & ~XT_UDP_INV_MASK)
- printf("Unknown invflags: 0x%X ",
- udp->invflags & ~XT_UDP_INV_MASK);
-}
-
-/* Saves the union ipt_matchinfo in parsable form to stdout. */
-static void udp_save(const void *ip, const struct xt_entry_match *match)
-{
- const struct xt_udp *udpinfo = (struct xt_udp *)match->data;
-
- if (udpinfo->spts[0] != 0
- || udpinfo->spts[1] != 0xFFFF) {
- if (udpinfo->invflags & XT_UDP_INV_SRCPT)
- printf("! ");
- if (udpinfo->spts[0]
- != udpinfo->spts[1])
- printf("--sport %u:%u ",
- udpinfo->spts[0],
- udpinfo->spts[1]);
- else
- printf("--sport %u ",
- udpinfo->spts[0]);
- }
-
- if (udpinfo->dpts[0] != 0
- || udpinfo->dpts[1] != 0xFFFF) {
- if (udpinfo->invflags & XT_UDP_INV_DSTPT)
- printf("! ");
- if (udpinfo->dpts[0]
- != udpinfo->dpts[1])
- printf("--dport %u:%u ",
- udpinfo->dpts[0],
- udpinfo->dpts[1]);
- else
- printf("--dport %u ",
- udpinfo->dpts[0]);
- }
-}
-
-static struct xtables_match udp_match = {
- .family = AF_INET,
- .name = "udp",
- .version = XTABLES_VERSION,
- .size = XT_ALIGN(sizeof(struct xt_udp)),
- .userspacesize = XT_ALIGN(sizeof(struct xt_udp)),
- .help = udp_help,
- .init = udp_init,
- .parse = udp_parse,
- .print = udp_print,
- .save = udp_save,
- .extra_opts = udp_opts,
-};
-
-static struct xtables_match udp_match6 = {
- .family = AF_INET6,
- .name = "udp",
- .version = XTABLES_VERSION,
- .size = XT_ALIGN(sizeof(struct xt_udp)),
- .userspacesize = XT_ALIGN(sizeof(struct xt_udp)),
- .help = udp_help,
- .init = udp_init,
- .parse = udp_parse,
- .print = udp_print,
- .save = udp_save,
- .extra_opts = udp_opts,
-};
-
-void
-_init(void)
-{
- xtables_register_match(&udp_match);
- xtables_register_match(&udp_match6);
-}
git://git.onelab.eu / iptables.git / blobdiff