| /* 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 <ip6tables.h> |
| /* To ensure that iptables compiles with an old kernel */ |
| #include "../include/linux/netfilter_ipv6/ip6t_multiport.h" |
| |
| /* Function which prints out usage message. */ |
| static void |
| help(void) |
| { |
| printf( |
| "multiport v%s 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", |
| IPTABLES_VERSION); |
| } |
| |
| static void |
| help_v1(void) |
| { |
| printf( |
| "multiport v%s 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", |
| IPTABLES_VERSION); |
| } |
| |
| static struct option opts[] = { |
| { "source-ports", 1, 0, '1' }, |
| { "sports", 1, 0, '1' }, /* synonym */ |
| { "destination-ports", 1, 0, '2' }, |
| { "dports", 1, 0, '2' }, /* synonym */ |
| { "ports", 1, 0, '3' }, |
| {0} |
| }; |
| |
| static char * |
| proto_to_name(u_int8_t proto) |
| { |
| switch (proto) { |
| case IPPROTO_TCP: |
| return "tcp"; |
| case IPPROTO_UDP: |
| return "udp"; |
| 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<IP6T_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 ip6t_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<IP6T_MULTI_PORTS; i++) |
| multiinfo->pflags[i] = 0; |
| |
| for (cp=buffer, i=0; cp && i<IP6T_MULTI_PORTS; cp=next, i++) { |
| next=strchr(cp, ','); |
| if (next) *next++='\0'; |
| range = strchr(cp, ':'); |
| if (range) { |
| if (i == IP6T_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); |
| } |
| |
| /* Initialize the match. */ |
| static void |
| init(struct ip6t_entry_match *m, unsigned int *nfcache) |
| { |
| } |
| |
| static const char * |
| check_proto(const struct ip6t_entry *entry) |
| { |
| char *proto; |
| |
| if ((proto = proto_to_name(entry->ipv6.proto)) != NULL) |
| return proto; |
| else if (!entry->ipv6.proto) |
| exit_error(PARAMETER_PROBLEM, |
| "multiport needs `-p tcp', `-p udp', `-p sctp' or `-p dccp'"); |
| else |
| exit_error(PARAMETER_PROBLEM, |
| "multiport only works with TCP, UDP, SCTP and DCCP"); |
| } |
| |
| /* Function which parses command options; returns true if it |
| ate an option */ |
| static int |
| parse(int c, char **argv, int invert, unsigned int *flags, |
| const struct ip6t_entry *entry, |
| unsigned int *nfcache, |
| struct ip6t_entry_match **match) |
| { |
| const char *proto; |
| struct ip6t_multiport *multiinfo |
| = (struct ip6t_multiport *)(*match)->data; |
| |
| switch (c) { |
| case '1': |
| check_inverse(argv[optind-1], &invert, &optind, 0); |
| proto = check_proto(entry); |
| multiinfo->count = parse_multi_ports(argv[optind-1], |
| multiinfo->ports, proto); |
| multiinfo->flags = IP6T_MULTIPORT_SOURCE; |
| break; |
| |
| case '2': |
| check_inverse(argv[optind-1], &invert, &optind, 0); |
| proto = check_proto(entry); |
| multiinfo->count = parse_multi_ports(argv[optind-1], |
| multiinfo->ports, proto); |
| multiinfo->flags = IP6T_MULTIPORT_DESTINATION; |
| break; |
| |
| case '3': |
| check_inverse(argv[optind-1], &invert, &optind, 0); |
| proto = check_proto(entry); |
| multiinfo->count = parse_multi_ports(argv[optind-1], |
| multiinfo->ports, proto); |
| multiinfo->flags = IP6T_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 |
| parse_v1(int c, char **argv, int invert, unsigned int *flags, |
| const struct ip6t_entry *entry, |
| unsigned int *nfcache, |
| struct ip6t_entry_match **match) |
| { |
| const char *proto; |
| struct ip6t_multiport_v1 *multiinfo |
| = (struct ip6t_multiport_v1 *)(*match)->data; |
| |
| switch (c) { |
| case '1': |
| check_inverse(argv[optind-1], &invert, &optind, 0); |
| proto = check_proto(entry); |
| parse_multi_ports_v1(argv[optind-1], multiinfo, proto); |
| multiinfo->flags = IP6T_MULTIPORT_SOURCE; |
| break; |
| |
| case '2': |
| check_inverse(argv[optind-1], &invert, &optind, 0); |
| proto = check_proto(entry); |
| parse_multi_ports_v1(argv[optind-1], multiinfo, proto); |
| multiinfo->flags = IP6T_MULTIPORT_DESTINATION; |
| break; |
| |
| case '3': |
| check_inverse(argv[optind-1], &invert, &optind, 0); |
| proto = check_proto(entry); |
| parse_multi_ports_v1(argv[optind-1], multiinfo, proto); |
| multiinfo->flags = IP6T_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; |
| } |
| |
| /* Final check; must specify something. */ |
| static void |
| final_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 |
| print(const struct ip6t_ip6 *ip, |
| const struct ip6t_entry_match *match, |
| int numeric) |
| { |
| const struct ip6t_multiport *multiinfo |
| = (const struct ip6t_multiport *)match->data; |
| unsigned int i; |
| |
| printf("multiport "); |
| |
| switch (multiinfo->flags) { |
| case IP6T_MULTIPORT_SOURCE: |
| printf("sports "); |
| break; |
| |
| case IP6T_MULTIPORT_DESTINATION: |
| printf("dports "); |
| break; |
| |
| case IP6T_MULTIPORT_EITHER: |
| printf("ports "); |
| break; |
| |
| default: |
| printf("ERROR "); |
| break; |
| } |
| |
| for (i=0; i < multiinfo->count; i++) { |
| printf("%s", i ? "," : ""); |
| print_port(multiinfo->ports[i], ip->proto, numeric); |
| } |
| printf(" "); |
| } |
| |
| static void |
| print_v1(const struct ip6t_ip6 *ip, |
| const struct ip6t_entry_match *match, |
| int numeric) |
| { |
| const struct ip6t_multiport_v1 *multiinfo |
| = (const struct ip6t_multiport_v1 *)match->data; |
| unsigned int i; |
| |
| printf("multiport "); |
| |
| switch (multiinfo->flags) { |
| case IP6T_MULTIPORT_SOURCE: |
| printf("sports "); |
| break; |
| |
| case IP6T_MULTIPORT_DESTINATION: |
| printf("dports "); |
| break; |
| |
| case IP6T_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], ip->proto, numeric); |
| if (multiinfo->pflags[i]) { |
| printf(":"); |
| print_port(multiinfo->ports[++i], ip->proto, numeric); |
| } |
| } |
| printf(" "); |
| } |
| |
| /* Saves the union ip6t_matchinfo in parsable form to stdout. */ |
| static void save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match) |
| { |
| const struct ip6t_multiport *multiinfo |
| = (const struct ip6t_multiport *)match->data; |
| unsigned int i; |
| |
| switch (multiinfo->flags) { |
| case IP6T_MULTIPORT_SOURCE: |
| printf("--sports "); |
| break; |
| |
| case IP6T_MULTIPORT_DESTINATION: |
| printf("--dports "); |
| break; |
| |
| case IP6T_MULTIPORT_EITHER: |
| printf("--ports "); |
| break; |
| } |
| |
| for (i=0; i < multiinfo->count; i++) { |
| printf("%s", i ? "," : ""); |
| print_port(multiinfo->ports[i], ip->proto, 1); |
| } |
| printf(" "); |
| } |
| |
| static void save_v1(const struct ip6t_ip6 *ip, |
| const struct ip6t_entry_match *match) |
| { |
| const struct ip6t_multiport_v1 *multiinfo |
| = (const struct ip6t_multiport_v1 *)match->data; |
| unsigned int i; |
| |
| switch (multiinfo->flags) { |
| case IP6T_MULTIPORT_SOURCE: |
| printf("--sports "); |
| break; |
| |
| case IP6T_MULTIPORT_DESTINATION: |
| printf("--dports "); |
| break; |
| |
| case IP6T_MULTIPORT_EITHER: |
| printf("--ports "); |
| break; |
| } |
| |
| if (multiinfo->invert) |
| printf("! "); |
| |
| for (i=0; i < multiinfo->count; i++) { |
| printf("%s", i ? "," : ""); |
| print_port(multiinfo->ports[i], ip->proto, 1); |
| if (multiinfo->pflags[i]) { |
| printf(":"); |
| print_port(multiinfo->ports[++i], ip->proto, 1); |
| } |
| } |
| printf(" "); |
| } |
| |
| static struct ip6tables_match multiport = { |
| .name = "multiport", |
| .version = IPTABLES_VERSION, |
| .size = IP6T_ALIGN(sizeof(struct ip6t_multiport)), |
| .userspacesize = IP6T_ALIGN(sizeof(struct ip6t_multiport)), |
| .help = &help, |
| .init = &init, |
| .parse = &parse, |
| .final_check = &final_check, |
| .print = &print, |
| .save = &save, |
| .extra_opts = opts, |
| }; |
| |
| static struct ip6tables_match multiport_v1 = { |
| .next = NULL, |
| .name = "multiport", |
| .revision = 1, |
| .version = IPTABLES_VERSION, |
| .size = IP6T_ALIGN(sizeof(struct ip6t_multiport_v1)), |
| .userspacesize = IP6T_ALIGN(sizeof(struct ip6t_multiport_v1)), |
| .help = &help_v1, |
| .init = &init, |
| .parse = &parse_v1, |
| .final_check = &final_check, |
| .print = &print_v1, |
| .save = &save_v1, |
| .extra_opts = opts |
| }; |
| |
| void |
| _init(void) |
| { |
| register_match6(&multiport); |
| register_match6(&multiport_v1); |
| } |