+++ /dev/null
-/* Shared library add-on to iptables to add multiple TCP port support. */
-#include <stdio.h>
-#include <netdb.h>
-#include <string.h>
-#include <stdlib.h>
-#include <getopt.h>
-
-#include <xtables.h>
-#include <libiptc/libiptc.h>
-#include <libiptc/libip6tc.h>
-/* To ensure that iptables compiles with an old kernel */
-#include "../include/linux/netfilter/xt_multiport.h"
-
-/* Function which prints out usage message. */
-static void multiport_help(void)
-{
- printf(
-"multiport match options:\n"
-" --source-ports port[,port,port...]\n"
-" --sports ...\n"
-" match source port(s)\n"
-" --destination-ports port[,port,port...]\n"
-" --dports ...\n"
-" match destination port(s)\n"
-" --ports port[,port,port]\n"
-" match both source and destination port(s)\n"
-" NOTE: this kernel does not support port ranges in multiport.\n");
-}
-
-static void multiport_help_v1(void)
-{
- printf(
-"multiport match options:\n"
-" --source-ports [!] port[,port:port,port...]\n"
-" --sports ...\n"
-" match source port(s)\n"
-" --destination-ports [!] port[,port:port,port...]\n"
-" --dports ...\n"
-" match destination port(s)\n"
-" --ports [!] port[,port:port,port]\n"
-" match both source and destination port(s)\n");
-}
-
-static const struct option multiport_opts[] = {
- { "source-ports", 1, NULL, '1' },
- { "sports", 1, NULL, '1' }, /* synonym */
- { "destination-ports", 1, NULL, '2' },
- { "dports", 1, NULL, '2' }, /* synonym */
- { "ports", 1, NULL, '3' },
- { .name = NULL }
-};
-
-static char *
-proto_to_name(u_int8_t proto)
-{
- switch (proto) {
- case IPPROTO_TCP:
- return "tcp";
- case IPPROTO_UDP:
- return "udp";
- case IPPROTO_UDPLITE:
- return "udplite";
- case IPPROTO_SCTP:
- return "sctp";
- case IPPROTO_DCCP:
- return "dccp";
- default:
- return NULL;
- }
-}
-
-static unsigned int
-parse_multi_ports(const char *portstring, u_int16_t *ports, const char *proto)
-{
- char *buffer, *cp, *next;
- unsigned int i;
-
- buffer = strdup(portstring);
- if (!buffer) exit_error(OTHER_PROBLEM, "strdup failed");
-
- for (cp=buffer, i=0; cp && i<XT_MULTI_PORTS; cp=next,i++)
- {
- next=strchr(cp, ',');
- if (next) *next++='\0';
- ports[i] = parse_port(cp, proto);
- }
- if (cp) exit_error(PARAMETER_PROBLEM, "too many ports specified");
- free(buffer);
- return i;
-}
-
-static void
-parse_multi_ports_v1(const char *portstring,
- struct xt_multiport_v1 *multiinfo,
- const char *proto)
-{
- char *buffer, *cp, *next, *range;
- unsigned int i;
- u_int16_t m;
-
- buffer = strdup(portstring);
- if (!buffer) exit_error(OTHER_PROBLEM, "strdup failed");
-
- for (i=0; i<XT_MULTI_PORTS; i++)
- multiinfo->pflags[i] = 0;
-
- for (cp=buffer, i=0; cp && i<XT_MULTI_PORTS; cp=next, i++) {
- next=strchr(cp, ',');
- if (next) *next++='\0';
- range = strchr(cp, ':');
- if (range) {
- if (i == XT_MULTI_PORTS-1)
- exit_error(PARAMETER_PROBLEM,
- "too many ports specified");
- *range++ = '\0';
- }
- multiinfo->ports[i] = parse_port(cp, proto);
- if (range) {
- multiinfo->pflags[i] = 1;
- multiinfo->ports[++i] = parse_port(range, proto);
- if (multiinfo->ports[i-1] >= multiinfo->ports[i])
- exit_error(PARAMETER_PROBLEM,
- "invalid portrange specified");
- m <<= 1;
- }
- }
- multiinfo->count = i;
- if (cp) exit_error(PARAMETER_PROBLEM, "too many ports specified");
- free(buffer);
-}
-
-static const char *
-check_proto(u_int16_t pnum, u_int8_t invflags)
-{
- char *proto;
-
- if (invflags & XT_INV_PROTO)
- exit_error(PARAMETER_PROBLEM,
- "multiport only works with TCP, UDP, UDPLITE, SCTP and DCCP");
-
- if ((proto = proto_to_name(pnum)) != NULL)
- return proto;
- else if (!pnum)
- exit_error(PARAMETER_PROBLEM,
- "multiport needs `-p tcp', `-p udp', `-p udplite', "
- "`-p sctp' or `-p dccp'");
- else
- exit_error(PARAMETER_PROBLEM,
- "multiport only works with TCP, UDP, UDPLITE, SCTP and DCCP");
-}
-
-/* Function which parses command options; returns true if it
- ate an option */
-static int
-__multiport_parse(int c, char **argv, int invert, unsigned int *flags,
- struct xt_entry_match **match, u_int16_t pnum,
- u_int8_t invflags)
-{
- const char *proto;
- struct xt_multiport *multiinfo
- = (struct xt_multiport *)(*match)->data;
-
- switch (c) {
- case '1':
- check_inverse(argv[optind-1], &invert, &optind, 0);
- proto = check_proto(pnum, invflags);
- multiinfo->count = parse_multi_ports(argv[optind-1],
- multiinfo->ports, proto);
- multiinfo->flags = XT_MULTIPORT_SOURCE;
- break;
-
- case '2':
- check_inverse(argv[optind-1], &invert, &optind, 0);
- proto = check_proto(pnum, invflags);
- multiinfo->count = parse_multi_ports(argv[optind-1],
- multiinfo->ports, proto);
- multiinfo->flags = XT_MULTIPORT_DESTINATION;
- break;
-
- case '3':
- check_inverse(argv[optind-1], &invert, &optind, 0);
- proto = check_proto(pnum, invflags);
- multiinfo->count = parse_multi_ports(argv[optind-1],
- multiinfo->ports, proto);
- multiinfo->flags = XT_MULTIPORT_EITHER;
- break;
-
- default:
- return 0;
- }
-
- if (invert)
- exit_error(PARAMETER_PROBLEM,
- "multiport does not support invert");
-
- if (*flags)
- exit_error(PARAMETER_PROBLEM,
- "multiport can only have one option");
- *flags = 1;
- return 1;
-}
-
-static int
-multiport_parse(int c, char **argv, int invert, unsigned int *flags,
- const void *e, struct xt_entry_match **match)
-{
- const struct ipt_entry *entry = e;
- return __multiport_parse(c, argv, invert, flags, match,
- entry->ip.proto, entry->ip.invflags);
-}
-
-static int
-multiport_parse6(int c, char **argv, int invert, unsigned int *flags,
- const void *e, struct xt_entry_match **match)
-{
- const struct ip6t_entry *entry = (const struct ip6t_entry *)e;
- return __multiport_parse(c, argv, invert, flags, match,
- entry->ipv6.proto, entry->ipv6.invflags);
-}
-
-static int
-__multiport_parse_v1(int c, char **argv, int invert, unsigned int *flags,
- struct xt_entry_match **match, u_int16_t pnum,
- u_int8_t invflags)
-{
- const char *proto;
- struct xt_multiport_v1 *multiinfo
- = (struct xt_multiport_v1 *)(*match)->data;
-
- switch (c) {
- case '1':
- check_inverse(argv[optind-1], &invert, &optind, 0);
- proto = check_proto(pnum, invflags);
- parse_multi_ports_v1(argv[optind-1], multiinfo, proto);
- multiinfo->flags = XT_MULTIPORT_SOURCE;
- break;
-
- case '2':
- check_inverse(argv[optind-1], &invert, &optind, 0);
- proto = check_proto(pnum, invflags);
- parse_multi_ports_v1(argv[optind-1], multiinfo, proto);
- multiinfo->flags = XT_MULTIPORT_DESTINATION;
- break;
-
- case '3':
- check_inverse(argv[optind-1], &invert, &optind, 0);
- proto = check_proto(pnum, invflags);
- parse_multi_ports_v1(argv[optind-1], multiinfo, proto);
- multiinfo->flags = XT_MULTIPORT_EITHER;
- break;
-
- default:
- return 0;
- }
-
- if (invert)
- multiinfo->invert = 1;
-
- if (*flags)
- exit_error(PARAMETER_PROBLEM,
- "multiport can only have one option");
- *flags = 1;
- return 1;
-}
-
-static int
-multiport_parse_v1(int c, char **argv, int invert, unsigned int *flags,
- const void *e, struct xt_entry_match **match)
-{
- const struct ipt_entry *entry = e;
- return __multiport_parse_v1(c, argv, invert, flags, match,
- entry->ip.proto, entry->ip.invflags);
-}
-
-static int
-multiport_parse6_v1(int c, char **argv, int invert, unsigned int *flags,
- const void *e, struct xt_entry_match **match)
-{
- const struct ip6t_entry *entry = (const struct ip6t_entry *)e;
- return __multiport_parse_v1(c, argv, invert, flags, match,
- entry->ipv6.proto, entry->ipv6.invflags);
-}
-
-/* Final check; must specify something. */
-static void multiport_check(unsigned int flags)
-{
- if (!flags)
- exit_error(PARAMETER_PROBLEM, "multiport expection an option");
-}
-
-static char *
-port_to_service(int port, u_int8_t proto)
-{
- struct servent *service;
-
- if ((service = getservbyport(htons(port), proto_to_name(proto))))
- return service->s_name;
-
- return NULL;
-}
-
-static void
-print_port(u_int16_t port, u_int8_t protocol, int numeric)
-{
- char *service;
-
- if (numeric || (service = port_to_service(port, protocol)) == NULL)
- printf("%u", port);
- else
- printf("%s", service);
-}
-
-/* Prints out the matchinfo. */
-static void
-__multiport_print(const struct xt_entry_match *match, int numeric,
- u_int16_t proto)
-{
- const struct xt_multiport *multiinfo
- = (const struct xt_multiport *)match->data;
- unsigned int i;
-
- printf("multiport ");
-
- switch (multiinfo->flags) {
- case XT_MULTIPORT_SOURCE:
- printf("sports ");
- break;
-
- case XT_MULTIPORT_DESTINATION:
- printf("dports ");
- break;
-
- case XT_MULTIPORT_EITHER:
- printf("ports ");
- break;
-
- default:
- printf("ERROR ");
- break;
- }
-
- for (i=0; i < multiinfo->count; i++) {
- printf("%s", i ? "," : "");
- print_port(multiinfo->ports[i], proto, numeric);
- }
- printf(" ");
-}
-
-static void multiport_print(const void *ip_void,
- const struct xt_entry_match *match, int numeric)
-{
- const struct ipt_ip *ip = ip_void;
- __multiport_print(match, numeric, ip->proto);
-}
-
-static void multiport_print6(const void *ip_void,
- const struct xt_entry_match *match, int numeric)
-{
- const struct ip6t_ip6 *ip = (const struct ip6t_ip6 *)ip_void;
- __multiport_print(match, numeric, ip->proto);
-}
-
-static void __multiport_print_v1(const struct xt_entry_match *match,
- int numeric, u_int16_t proto)
-{
- const struct xt_multiport_v1 *multiinfo
- = (const struct xt_multiport_v1 *)match->data;
- unsigned int i;
-
- printf("multiport ");
-
- switch (multiinfo->flags) {
- case XT_MULTIPORT_SOURCE:
- printf("sports ");
- break;
-
- case XT_MULTIPORT_DESTINATION:
- printf("dports ");
- break;
-
- case XT_MULTIPORT_EITHER:
- printf("ports ");
- break;
-
- default:
- printf("ERROR ");
- break;
- }
-
- if (multiinfo->invert)
- printf("! ");
-
- for (i=0; i < multiinfo->count; i++) {
- printf("%s", i ? "," : "");
- print_port(multiinfo->ports[i], proto, numeric);
- if (multiinfo->pflags[i]) {
- printf(":");
- print_port(multiinfo->ports[++i], proto, numeric);
- }
- }
- printf(" ");
-}
-
-static void multiport_print_v1(const void *ip_void,
- const struct xt_entry_match *match, int numeric)
-{
- const struct ipt_ip *ip = ip_void;
- __multiport_print_v1(match, numeric, ip->proto);
-}
-
-static void multiport_print6_v1(const void *ip_void,
- const struct xt_entry_match *match, int numeric)
-{
- const struct ip6t_ip6 *ip = (const struct ip6t_ip6 *)ip_void;
- __multiport_print_v1(match, numeric, ip->proto);
-}
-
-/* Saves the union ipt_matchinfo in parsable form to stdout. */
-static void __multiport_save(const struct xt_entry_match *match,
- u_int16_t proto)
-{
- const struct xt_multiport *multiinfo
- = (const struct xt_multiport *)match->data;
- unsigned int i;
-
- switch (multiinfo->flags) {
- case XT_MULTIPORT_SOURCE:
- printf("--sports ");
- break;
-
- case XT_MULTIPORT_DESTINATION:
- printf("--dports ");
- break;
-
- case XT_MULTIPORT_EITHER:
- printf("--ports ");
- break;
- }
-
- for (i=0; i < multiinfo->count; i++) {
- printf("%s", i ? "," : "");
- print_port(multiinfo->ports[i], proto, 1);
- }
- printf(" ");
-}
-
-static void multiport_save(const void *ip_void,
- const struct xt_entry_match *match)
-{
- const struct ipt_ip *ip = ip_void;
- __multiport_save(match, ip->proto);
-}
-
-static void multiport_save6(const void *ip_void,
- const struct xt_entry_match *match)
-{
- const struct ip6t_ip6 *ip = (const struct ip6t_ip6 *)ip_void;
- __multiport_save(match, ip->proto);
-}
-
-static void __multiport_save_v1(const struct xt_entry_match *match,
- u_int16_t proto)
-{
- const struct xt_multiport_v1 *multiinfo
- = (const struct xt_multiport_v1 *)match->data;
- unsigned int i;
-
- switch (multiinfo->flags) {
- case XT_MULTIPORT_SOURCE:
- printf("--sports ");
- break;
-
- case XT_MULTIPORT_DESTINATION:
- printf("--dports ");
- break;
-
- case XT_MULTIPORT_EITHER:
- printf("--ports ");
- break;
- }
-
- if (multiinfo->invert)
- printf("! ");
-
- for (i=0; i < multiinfo->count; i++) {
- printf("%s", i ? "," : "");
- print_port(multiinfo->ports[i], proto, 1);
- if (multiinfo->pflags[i]) {
- printf(":");
- print_port(multiinfo->ports[++i], proto, 1);
- }
- }
- printf(" ");
-}
-
-static void multiport_save_v1(const void *ip_void,
- const struct xt_entry_match *match)
-{
- const struct ipt_ip *ip = ip_void;
- __multiport_save_v1(match, ip->proto);
-}
-
-static void multiport_save6_v1(const void *ip_void,
- const struct xt_entry_match *match)
-{
- const struct ip6t_ip6 *ip = (const struct ip6t_ip6 *)ip_void;
- __multiport_save_v1(match, ip->proto);
-}
-
-static struct xtables_match multiport_match = {
- .family = AF_INET,
- .name = "multiport",
- .revision = 0,
- .version = XTABLES_VERSION,
- .size = XT_ALIGN(sizeof(struct xt_multiport)),
- .userspacesize = XT_ALIGN(sizeof(struct xt_multiport)),
- .help = multiport_help,
- .parse = multiport_parse,
- .final_check = multiport_check,
- .print = multiport_print,
- .save = multiport_save,
- .extra_opts = multiport_opts,
-};
-
-static struct xtables_match multiport_match6 = {
- .family = AF_INET6,
- .name = "multiport",
- .revision = 0,
- .version = XTABLES_VERSION,
- .size = XT_ALIGN(sizeof(struct xt_multiport)),
- .userspacesize = XT_ALIGN(sizeof(struct xt_multiport)),
- .help = multiport_help,
- .parse = multiport_parse6,
- .final_check = multiport_check,
- .print = multiport_print6,
- .save = multiport_save6,
- .extra_opts = multiport_opts,
-};
-
-static struct xtables_match multiport_match_v1 = {
- .family = AF_INET,
- .name = "multiport",
- .version = XTABLES_VERSION,
- .revision = 1,
- .size = XT_ALIGN(sizeof(struct xt_multiport_v1)),
- .userspacesize = XT_ALIGN(sizeof(struct xt_multiport_v1)),
- .help = multiport_help_v1,
- .parse = multiport_parse_v1,
- .final_check = multiport_check,
- .print = multiport_print_v1,
- .save = multiport_save_v1,
- .extra_opts = multiport_opts,
-};
-
-static struct xtables_match multiport_match6_v1 = {
- .family = AF_INET6,
- .name = "multiport",
- .version = XTABLES_VERSION,
- .revision = 1,
- .size = XT_ALIGN(sizeof(struct xt_multiport_v1)),
- .userspacesize = XT_ALIGN(sizeof(struct xt_multiport_v1)),
- .help = multiport_help_v1,
- .parse = multiport_parse6_v1,
- .final_check = multiport_check,
- .print = multiport_print6_v1,
- .save = multiport_save6_v1,
- .extra_opts = multiport_opts,
-};
-
-void
-_init(void)
-{
- xtables_register_match(&multiport_match);
- xtables_register_match(&multiport_match6);
- xtables_register_match(&multiport_match_v1);
- xtables_register_match(&multiport_match6_v1);
-}
git://git.onelab.eu / iptables.git / blobdiff