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#include <stdint.h>
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#include <stdio.h>
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#include <netdb.h>
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#include <arpa/inet.h>
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#include <xtables.h>
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#include <linux/netfilter/xt_tcpudp.h>
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enum {
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O_SOURCE_PORT = 0,
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O_DEST_PORT,
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};
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static void udp_help(void)
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{
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printf(
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"udp match options:\n"
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"[!] --source-port port[:port]\n"
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" --sport ...\n"
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" match source port(s)\n"
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"[!] --destination-port port[:port]\n"
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" --dport ...\n"
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" match destination port(s)\n");
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}
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#define s struct xt_udp
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static const struct xt_option_entry udp_opts[] = {
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{.name = "source-port", .id = O_SOURCE_PORT, .type = XTTYPE_PORTRC,
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.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, spts)},
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{.name = "sport", .id = O_SOURCE_PORT, .type = XTTYPE_PORTRC,
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.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, spts)},
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{.name = "destination-port", .id = O_DEST_PORT, .type = XTTYPE_PORTRC,
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.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, dpts)},
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{.name = "dport", .id = O_DEST_PORT, .type = XTTYPE_PORTRC,
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.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, dpts)},
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XTOPT_TABLEEND,
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};
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#undef s
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static void udp_init(struct xt_entry_match *m)
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{
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struct xt_udp *udpinfo = (struct xt_udp *)m->data;
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udpinfo->spts[1] = udpinfo->dpts[1] = 0xFFFF;
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}
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static void udp_parse(struct xt_option_call *cb)
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{
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struct xt_udp *udpinfo = cb->data;
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xtables_option_parse(cb);
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switch (cb->entry->id) {
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case O_SOURCE_PORT:
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if (cb->invert)
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udpinfo->invflags |= XT_UDP_INV_SRCPT;
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break;
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case O_DEST_PORT:
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if (cb->invert)
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udpinfo->invflags |= XT_UDP_INV_DSTPT;
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break;
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}
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}
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static const char *
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port_to_service(int port)
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{
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const struct servent *service;
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if ((service = getservbyport(htons(port), "udp")))
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return service->s_name;
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return NULL;
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}
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static void
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print_port(uint16_t port, int numeric)
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{
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const char *service;
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if (numeric || (service = port_to_service(port)) == NULL)
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printf("%u", port);
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else
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printf("%s", service);
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}
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static void
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print_ports(const char *name, uint16_t min, uint16_t max,
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int invert, int numeric)
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{
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const char *inv = invert ? "!" : "";
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if (min != 0 || max != 0xFFFF || invert) {
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printf(" %s", name);
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if (min == max) {
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printf(":%s", inv);
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print_port(min, numeric);
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} else {
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printf("s:%s", inv);
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print_port(min, numeric);
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printf(":");
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print_port(max, numeric);
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}
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}
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}
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static void
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udp_print(const void *ip, const struct xt_entry_match *match, int numeric)
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{
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const struct xt_udp *udp = (struct xt_udp *)match->data;
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printf(" udp");
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print_ports("spt", udp->spts[0], udp->spts[1],
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udp->invflags & XT_UDP_INV_SRCPT,
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numeric);
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print_ports("dpt", udp->dpts[0], udp->dpts[1],
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udp->invflags & XT_UDP_INV_DSTPT,
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numeric);
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if (udp->invflags & ~XT_UDP_INV_MASK)
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printf(" Unknown invflags: 0x%X",
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udp->invflags & ~XT_UDP_INV_MASK);
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}
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static void udp_save(const void *ip, const struct xt_entry_match *match)
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{
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const struct xt_udp *udpinfo = (struct xt_udp *)match->data;
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if (udpinfo->spts[0] != 0
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|| udpinfo->spts[1] != 0xFFFF) {
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if (udpinfo->invflags & XT_UDP_INV_SRCPT)
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printf(" !");
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if (udpinfo->spts[0]
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!= udpinfo->spts[1])
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printf(" --sport %u:%u",
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udpinfo->spts[0],
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udpinfo->spts[1]);
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else
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printf(" --sport %u",
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udpinfo->spts[0]);
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}
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if (udpinfo->dpts[0] != 0
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|| udpinfo->dpts[1] != 0xFFFF) {
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if (udpinfo->invflags & XT_UDP_INV_DSTPT)
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printf(" !");
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if (udpinfo->dpts[0]
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!= udpinfo->dpts[1])
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printf(" --dport %u:%u",
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udpinfo->dpts[0],
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udpinfo->dpts[1]);
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else
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printf(" --dport %u",
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udpinfo->dpts[0]);
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}
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}
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static int udp_xlate(struct xt_xlate *xl,
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const struct xt_xlate_mt_params *params)
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{
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const struct xt_udp *udpinfo = (struct xt_udp *)params->match->data;
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char *space= "";
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if (udpinfo->spts[0] != 0 || udpinfo->spts[1] != 0xFFFF) {
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if (udpinfo->spts[0] != udpinfo->spts[1]) {
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xt_xlate_add(xl,"udp sport %s%u-%u",
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udpinfo->invflags & XT_UDP_INV_SRCPT ?
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"!= ": "",
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udpinfo->spts[0], udpinfo->spts[1]);
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} else {
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xt_xlate_add(xl, "udp sport %s%u",
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udpinfo->invflags & XT_UDP_INV_SRCPT ?
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"!= ": "",
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udpinfo->spts[0]);
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}
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space = " ";
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}
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if (udpinfo->dpts[0] != 0 || udpinfo->dpts[1] != 0xFFFF) {
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if (udpinfo->dpts[0] != udpinfo->dpts[1]) {
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xt_xlate_add(xl,"%sudp dport %s%u-%u", space,
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udpinfo->invflags & XT_UDP_INV_SRCPT ?
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"!= ": "",
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udpinfo->dpts[0], udpinfo->dpts[1]);
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} else {
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xt_xlate_add(xl,"%sudp dport %s%u", space,
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udpinfo->invflags & XT_UDP_INV_SRCPT ?
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"!= ": "",
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udpinfo->dpts[0]);
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}
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}
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return 1;
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}
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static struct xtables_match udp_match = {
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.family = NFPROTO_UNSPEC,
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.name = "udp",
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.version = XTABLES_VERSION,
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.size = XT_ALIGN(sizeof(struct xt_udp)),
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.userspacesize = XT_ALIGN(sizeof(struct xt_udp)),
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.help = udp_help,
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.init = udp_init,
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.print = udp_print,
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.save = udp_save,
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.x6_parse = udp_parse,
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.x6_options = udp_opts,
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.xlate = udp_xlate,
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};
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void
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_init(void)
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{
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xtables_register_match(&udp_match);
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}
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