| /* Code to save the iptables state, in human readable-form. */ |
| #include <getopt.h> |
| #include <sys/errno.h> |
| #include <stdio.h> |
| #include <dlfcn.h> |
| #include <time.h> |
| #include "packet-match/userspace/libiptc/libiptc.h" |
| #include "packet-match/userspace/iptables.h" |
| |
| /* Keeping track of external matches and targets. */ |
| static struct option options[] = { |
| { "binary", 1, 0, 'b' }, |
| { "counters", 1, 0, 'c' }, |
| { "dump", 1, 0, 'd' }, |
| { 0 } |
| }; |
| |
| #define IP_PARTS_NATIVE(n) \ |
| (unsigned int)((n)>>24)&0xFF, \ |
| (unsigned int)((n)>>16)&0xFF, \ |
| (unsigned int)((n)>>8)&0xFF, \ |
| (unsigned int)((n)&0xFF) |
| |
| #define IP_PARTS(n) IP_PARTS_NATIVE(ntohl(n)) |
| |
| /* This assumes that mask is contiguous, and byte-bounded. */ |
| static void |
| print_iface(char letter, const char *iface, const unsigned char *mask, |
| int invert) |
| { |
| unsigned int i; |
| |
| if (mask[0] == 0) |
| return; |
| |
| printf("-%c %s", letter, invert ? "! " : ""); |
| |
| for (i = 0; i < IFNAMSIZ; i++) { |
| if (mask[i] != 0) { |
| if (iface[i] != '\0') |
| printf("%c", iface[i]); |
| } else { |
| if (iface[i] != '\0') |
| printf("+"); |
| break; |
| } |
| } |
| } |
| |
| /* These are hardcoded backups in iptables.c, so they are safe */ |
| struct pprot { |
| char *name; |
| u_int8_t num; |
| }; |
| |
| static const struct pprot chain_protos[] = { |
| { "tcp", IPPROTO_TCP }, |
| { "udp", IPPROTO_UDP }, |
| { "icmp", IPPROTO_ICMP }, |
| }; |
| |
| static void print_proto(u_int16_t proto, int invert) |
| { |
| if (proto) { |
| unsigned int i; |
| const char *invertstr = invert ? "! " : ""; |
| |
| for (i = 0; i < sizeof(chain_protos)/sizeof(struct pprot); i++) |
| if (chain_protos[i].num == proto) { |
| printf("-p %s%s ", |
| invertstr, chain_protos[i].name); |
| return; |
| } |
| |
| printf("-p %s%u ", invertstr, proto); |
| } |
| } |
| |
| static int non_zero(const void *ptr, size_t size) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < size; i++) |
| if (((char *)ptr)[i]) |
| return 0; |
| |
| return 1; |
| } |
| |
| /* We want this to be readable, so only print out neccessary fields. |
| * Because that's the kind of world I want to live in. */ |
| static void print_rule(const struct ipt_entry *e, int counters) |
| { |
| if (counters) |
| printf("[%llu,%llu] ", e->counters.pcnt, e->counters.bcnt); |
| |
| /* Print IP part. */ |
| if (e->ip.smsk.s_addr) |
| printf("-s %s%u.%u.%u.%u/%u.%u.%u.%u ", |
| e->ip.invflags & IPT_INV_SRCIP ? "! " : "", |
| IP_PARTS(e->ip.src.s_addr), |
| IP_PARTS(e->ip.smsk.s_addr)); |
| if (e->ip.dmsk.s_addr) |
| printf("-d %s%u.%u.%u.%u/%u.%u.%u.%u ", |
| e->ip.invflags & IPT_INV_SRCIP ? "! " : "", |
| IP_PARTS(e->ip.dst.s_addr), |
| IP_PARTS(e->ip.dmsk.s_addr)); |
| |
| print_iface('i', e->ip.iniface, e->ip.iniface_mask, |
| e->ip.invflags & IPT_INV_VIA_IN); |
| print_iface('o', e->ip.outiface, e->ip.outiface_mask, |
| e->ip.invflags & IPT_INV_VIA_OUT); |
| print_proto(e->ip.proto, e->ip.invflags & IPT_INV_PROTO); |
| |
| if (e->ip.flags & IPT_F_FRAG) |
| printf("%s-f ", |
| e->ip.invflags & IPT_INV_FRAG ? "! " : ""); |
| |
| if (e->ip.flags & IPT_F_TOS) |
| printf("-t %s0x%02X ", |
| e->ip.invflags & IPT_INV_TOS ? "! " : "", |
| e->ip.tos); |
| |
| /* Print matchinfo part */ |
| if (e->match_name[0]) { |
| struct iptables_match *match = find_match(e->match_name, 1); |
| |
| if (match) |
| match->save(e); |
| else { |
| /* If some bits are non-zero, it implies we *need* |
| to understand it */ |
| if (non_zero(&e->matchinfo, sizeof(e->matchinfo))) { |
| fprintf(stderr, |
| "Can't find library for match `%s'\n", |
| e->match_name); |
| exit(1); |
| } |
| } |
| } |
| |
| /* Print targinfo part */ |
| if (e->target_name[0]) { |
| struct iptables_target *target |
| = find_target(e->target_name, 1); |
| |
| if (target) |
| target->save(e); |
| else { |
| /* If some bits are non-zero, it implies we *need* |
| to understand it */ |
| if (non_zero(&e->targinfo, sizeof(e->targinfo))) { |
| fprintf(stderr, |
| "Can't find library for target `%s'\n", |
| e->target_name); |
| exit(1); |
| } |
| } |
| } |
| printf("\n"); |
| } |
| |
| /* Debugging prototype. */ |
| extern void dump_entries(iptc_handle_t handle); |
| |
| /* Format: |
| * :Chain name POLICY packets bytes |
| * rule |
| */ |
| int main(int argc, char *argv[]) |
| { |
| iptc_handle_t h; |
| const char *chain = NULL; |
| int c; |
| int binary = 0, counters = 0; |
| |
| program_name = "iptables-save"; |
| program_version = NETFILTER_VERSION; |
| |
| while ((c = getopt_long(argc, argv, "bc", options, NULL)) != -1) { |
| switch (c) { |
| case 'b': |
| binary = 1; |
| break; |
| |
| case 'c': |
| counters = 1; |
| break; |
| |
| case 'd': |
| /* Debugging dump. */ |
| h = iptc_init(); |
| if (!h) |
| exit_error(OTHER_PROBLEM, "iptc_init: %s\n", |
| iptc_strerror(errno)); |
| dump_entries(h); |
| exit(0); |
| } |
| } |
| |
| if (optind < argc) { |
| fprintf(stderr, "Unknown arguments found on commandline"); |
| exit(1); |
| } |
| |
| h = iptc_init(); |
| if (!h) { |
| fprintf(stderr, "Can't initialize: %s\n", |
| iptc_strerror(errno)); |
| exit(1); |
| } |
| |
| if (!binary) { |
| time_t now = time(NULL); |
| |
| printf("# Generated by iptables-save v%s on %s", |
| NETFILTER_VERSION, ctime(&now)); |
| |
| /* Dump out chain names */ |
| while ((chain = iptc_next_chain(chain, &h)) != NULL) { |
| printf(":%s ", chain); |
| if (iptc_builtin(chain, &h)) { |
| struct ipt_counters count; |
| printf("%s ", |
| iptc_get_policy(chain, &count, &h)); |
| printf("%llu %llu\n", count.pcnt, count.bcnt); |
| } else { |
| printf("- 0 0\n"); |
| } |
| } |
| |
| /* Dump out rules */ |
| while ((chain = iptc_next_chain(chain, &h)) != NULL) { |
| unsigned int i; |
| |
| for (i = 0; i < iptc_num_rules(chain, &h); i++) { |
| const struct ipt_entry *e |
| = iptc_get_rule(chain, i, &h); |
| |
| if (!e) { |
| fprintf(stderr, |
| "Can't read rule %u of chain %s: %s\n", |
| i, chain, iptc_strerror(errno)); |
| exit(1); |
| } |
| print_rule(e, counters); |
| } |
| } |
| |
| now = time(NULL); |
| printf("COMMIT\n"); |
| printf("# Completed on %s", ctime(&now)); |
| } else { |
| /* Binary, huh? OK. */ |
| fprintf(stderr, "Binary NYI\n"); |
| exit(1); |
| } |
| |
| return 0; |
| } |