Merge branch 'fast-whitelist' of github.com:zmap/zmap
This commit is contained in:
Zakir Durumeric
commit
4a37dba56f
@ -25,6 +25,10 @@
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static constraint_t *constraint = NULL;
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uint32_t blacklist_lookup_index(uint64_t index) {
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return ntohl(constraint_lookup_index(constraint, index, ADDR_ALLOWED));
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}
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// check whether a single IP address is allowed to be scanned.
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// 1 => is allowed
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// 0 => is not allowed
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@ -121,9 +125,24 @@ int blacklist_init_from_files(char *whitelist_filename, char *blacklist_filename
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if (blacklist_filename) {
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init(blacklist_filename, "blacklist", ADDR_DISALLOWED);
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}
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constraint_optimize(constraint);
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constraint_paint_value(constraint, ADDR_ALLOWED);
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uint64_t allowed = blacklist_count_allowed();
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log_debug("blacklist", "%lu addresses allowed to be scanned (%0.0f%% of address space)",
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allowed, allowed*100./((long long int)1 << 32));
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/*
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// test
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log_debug("blacklist", "testing started");
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uint64_t count = constraint_count_ips(constraint, ADDR_ALLOWED);
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for (unsigned int i=0; i < count; i++) {
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int ip = constraint_lookup_index(constraint, i, ADDR_ALLOWED);
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if ((i & 0xFFFFFF) == 0)
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log_info("blacklist", "%x", i & 0xFF000000);
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if (constraint_lookup_ip(constraint, ip) != ADDR_ALLOWED) {
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log_error("blacklist", "test failed for index %d", i);
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}
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}
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log_debug("blacklist", "testing complete");
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*/
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return 0;
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}
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@ -3,6 +3,7 @@
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#ifndef BLACKLIST_H
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#define BLACKLIST_H
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uint32_t blacklist_lookup_index(uint64_t index);
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int blacklist_is_allowed(uint32_t s_addr);
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void blacklist_prefix(char *ip, int prefix_len);
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void whitelist_prefix(char *ip, int prefix_len);
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255
lib/constraint.c
255
lib/constraint.c
@ -50,16 +50,19 @@ typedef struct node {
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struct node *l;
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struct node *r;
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value_t value;
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uint64_t count;
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} node_t;
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// As an optimization, we precompute lookups for every prefix of this
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// length:
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#define RADIX_LENGTH 16
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#define RADIX_LENGTH 20
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struct _constraint {
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node_t *root; // root node of the tree
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node_t **radix; // array of nodes for every RADIX_LENGTH prefix
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int optimized; // is radix populated and up-to-date?
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node_t *root; // root node of the tree
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uint32_t *radix; // array of prefixes (/RADIX_LENGTH) that are painted paint_value
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size_t radix_len; // number of prefixes in radix array
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int painted; // have we precomputed counts for each node?
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value_t paint_value; // value for which we precomputed counts
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};
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// Tree operations respect the invariant that every node that isn't a
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@ -150,7 +153,7 @@ void constraint_set(constraint_t *con, uint32_t prefix, int len, value_t value)
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{
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assert(con);
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_set_recurse(con->root, prefix, len, value);
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con->optimized = 0;
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con->painted = 0;
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}
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// Return the value pertaining to an address, according to the tree
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@ -176,67 +179,88 @@ static int _lookup_ip(node_t *root, uint32_t address)
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// Return the value pertaining to an address.
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// (Note: address must be in host byte order.)
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int constraint_lookup_ip(constraint_t *con, uint32_t address)
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value_t constraint_lookup_ip(constraint_t *con, uint32_t address)
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{
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assert(con);
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if (con->optimized) {
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// Use radix optimization
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node_t *node = con->radix[address >> (32 - RADIX_LENGTH)];
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return _lookup_ip(con->root, address);
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}
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// Return the nth painted IP address.
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static int _lookup_index(node_t *root, uint64_t n)
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{
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assert(root);
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node_t *node = root;
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uint32_t ip = 0;
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uint32_t mask = 0x80000000;
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for (;;) {
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if (IS_LEAF(node)) {
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return node->value;
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return ip | n;
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}
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return _lookup_ip(node, address << RADIX_LENGTH);
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} else {
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// Do a full lookup using the tree
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log_trace("constraint", "Unoptimized lookup");
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return _lookup_ip(con->root, address);
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if (n < node->l->count) {
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node = node->l;
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} else {
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n -= node->l->count;
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node = node->r;
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ip |= mask;
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}
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mask >>= 1;
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}
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}
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// For a given value, return the IP address with zero-based index n.
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// (i.e., if there are three addresses with value 0xFF, looking up index 1
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// will return the second one).
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// Note that the tree must have been previously painted with this value.
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uint32_t constraint_lookup_index(constraint_t *con, uint64_t index, value_t value)
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{
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assert(con);
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if (!con->painted || con->paint_value != value) {
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constraint_paint_value(con, value);
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}
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uint64_t radix_idx = index / (1 << (32 - RADIX_LENGTH));
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if (radix_idx < con->radix_len) {
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// Radix lookup
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uint32_t radix_offset = index % (1 << (32 - RADIX_LENGTH)); // TODO: bitwise maths
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return con->radix[radix_idx] | radix_offset;
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}
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// Otherwise, do the "slow" lookup in tree.
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// Note that tree counts do NOT include things in the radix,
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// so we subtract these off here.
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index -= con->radix_len * (1 << (32 - RADIX_LENGTH));
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assert(index < con->root->count);
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return _lookup_index(con->root, index);
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}
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// Implement count_ips by recursing on halves of the tree. Size represents
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// the number of addresses in a prefix at the current level of the tree.
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static uint64_t _count_ips_recurse(node_t *node, value_t value, uint64_t size)
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// If paint is specified, each node will have its count set to the number of
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// leaves under it set to value.
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// If exclude_radix is specified, the number of addresses will exlcude prefixes
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// that are a /RADIX_LENGTH or larger
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static uint64_t _count_ips_recurse(node_t *node, value_t value, uint64_t size, int paint, int exclude_radix)
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{
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assert(node);
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uint64_t n;
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if (IS_LEAF(node)) {
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if (node->value == value) {
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return size;
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n = size;
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// Exclude prefixes already included in the radix
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if (exclude_radix && size >= (1 << (32 -RADIX_LENGTH))) {
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n = 0;
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}
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} else {
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return 0;
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n = 0;
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}
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} else {
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n = _count_ips_recurse(node->l, value, size >> 1, paint, exclude_radix) +
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_count_ips_recurse(node->r, value, size >> 1, paint, exclude_radix);
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}
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return _count_ips_recurse(node->l, value, size >> 1) +
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_count_ips_recurse(node->r, value, size >> 1);
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}
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// Return the number of addresses that have a given value.
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uint64_t constraint_count_ips(constraint_t *con, value_t value)
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{
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assert(con);
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return _count_ips_recurse(con->root, value, (uint64_t)1 << 32);
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}
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// Initialize the tree.
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// All addresses will initally have the given value.
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constraint_t* constraint_init(value_t value)
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{
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log_trace("constraint", "Initializing");
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constraint_t* con = malloc(sizeof(constraint_t));
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con->root = _create_leaf(value);
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con->radix = calloc(sizeof(node_t *), 1 << RADIX_LENGTH);
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assert(con->radix);
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con->optimized = 0;
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return con;
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}
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// Deinitialize and free the tree.
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void constraint_free(constraint_t *con)
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{
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assert(con);
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log_trace("constraint", "Cleaning up");
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_destroy_subtree(con->root);
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free(con->radix);
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free(con);
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if (paint) {
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node->count = n;
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}
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return n;
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}
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// Return a node that determines the values for the addresses with
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@ -250,8 +274,9 @@ static node_t* _lookup_node(node_t *root, uint32_t prefix, int len)
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node_t *node = root;
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uint32_t mask = 0x80000000;
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int i;
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for (int i=0; i < len; i++) {
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for (i=0; i < len; i++) {
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if (IS_LEAF(node)) {
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return node;
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}
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@ -265,21 +290,66 @@ static node_t* _lookup_node(node_t *root, uint32_t prefix, int len)
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return node;
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}
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// After values have been set, precompute prefix lookups.
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void constraint_optimize(constraint_t *con)
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// For each node, precompute the count of leaves beneath it set to value.
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// Note that the tree can be painted for only one value at a time.
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void constraint_paint_value(constraint_t *con, value_t value)
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{
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assert(con);
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if (con->optimized) {
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return;
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}
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log_trace("constraint", "Optimizing constraints");
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for (uint32_t i=0; i < (1 << RADIX_LENGTH); i++) {
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log_trace("constraint", "Painting value %lu", value);
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// Paint everything except what we will put in radix
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_count_ips_recurse(con->root, value, (uint64_t)1 << 32, 1, 1);
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// Fill in the radix array with a list of addresses
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uint32_t i;
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con->radix_len = 0;
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for (i=0; i < (1 << RADIX_LENGTH); i++) {
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uint32_t prefix = i << (32 - RADIX_LENGTH);
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con->radix[i] = _lookup_node(con->root, prefix, RADIX_LENGTH);
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node_t *node = _lookup_node(con->root, prefix, RADIX_LENGTH);
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if (IS_LEAF(node) && node->value == value) {
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// Add this prefix to the radix
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con->radix[con->radix_len++] = prefix;
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}
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}
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con->optimized = 1;
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log_debug("constraint", "%lu IPs in radix array, %lu IPs in tree",
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con->radix_len * (1 << (32 - RADIX_LENGTH)), con->root->count);
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con->painted = 1;
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con->paint_value = value;
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}
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// Return the number of addresses that have a given value.
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uint64_t constraint_count_ips(constraint_t *con, value_t value)
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{
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assert(con);
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if (con->painted && con->paint_value == value) {
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return con->root->count + con->radix_len * (1 << (32 - RADIX_LENGTH));
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} else {
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return _count_ips_recurse(con->root, value, (uint64_t)1 << 32, 0, 0);
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}
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}
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// Initialize the tree.
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// All addresses will initally have the given value.
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constraint_t* constraint_init(value_t value)
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{
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log_trace("constraint", "Initializing");
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constraint_t* con = malloc(sizeof(constraint_t));
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con->root = _create_leaf(value);
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con->radix = calloc(sizeof(uint32_t), 1 << RADIX_LENGTH);
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assert(con->radix);
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con->painted = 0;
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return con;
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}
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// Deinitialize and free the tree.
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void constraint_free(constraint_t *con)
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{
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assert(con);
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log_trace("constraint", "Cleaning up");
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_destroy_subtree(con->root);
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free(con->radix);
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free(con);
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}
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/*
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int main(void)
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@ -317,68 +387,3 @@ int main(void)
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}
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*/
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/*
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static int init(constraint_t *con, char *file, const char *name, value_t value)
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{
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FILE *fp;
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char line[1000];
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int blocked = 0;
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fp = fopen(file, "r");
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if (fp == NULL) {
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log_fatal(name, "Unable to open %s file: %s: %s",
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name, file, strerror(errno));
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}
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while (fgets(line, sizeof(line), fp) != NULL) {
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char *comment = strchr(line, '#');
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if (comment) {
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*comment = '\0';
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}
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char ip[33];
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if ((sscanf(line, "%32s", ip)) == EOF) {
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continue;
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}
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int prefix_len;
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char *slash = strchr(ip, '/');
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if (slash == NULL) {
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log_fatal(name,
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"Unable to parse %s file: %s",
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name, file);
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}
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// split apart network and prefix length
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*slash = '\0';
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prefix_len = atoi(&slash[1]);
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constraint_set(con, ntohl(inet_addr(ip)), prefix_len, value);
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blocked++;
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}
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fclose(fp);
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return 0;
|
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}
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|
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|
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|
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void main()
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{
|
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log_init(stderr, LOG_TRACE);
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|
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constraint_t *con = constraint_init(1);
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init(con, "blacklist.prefixes", "blacklist", 0);
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//constraint_optimize(con);
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printf("count(0)=%lu\n", constraint_count_ips(con, 0));
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printf("count(1)=%lu\n", constraint_count_ips(con, 1));
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|
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uint32_t i=0, count=0;
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do {
|
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if (constraint_lookup_ip(con, i))
|
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count++;
|
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} while (++i != 0);
|
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printf("derived count(1)=%u\n", count);
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|
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constraint_free(con);
|
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|
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}
|
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|
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*/
|
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|
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@ -1,14 +1,17 @@
|
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#ifndef CONSTRAINT_H
|
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#define CONSTRAINT_H
|
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|
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#include <stdint.h>
|
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|
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typedef struct _constraint constraint_t;
|
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typedef int value_t;
|
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typedef unsigned int value_t;
|
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|
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constraint_t* constraint_init(value_t value);
|
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void constraint_free(constraint_t *con);
|
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void constraint_set(constraint_t *con, uint32_t prefix, int len, value_t value);
|
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void constraint_optimize(constraint_t *con);
|
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int constraint_lookup_ip(constraint_t *con, uint32_t address);
|
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value_t constraint_lookup_ip(constraint_t *con, uint32_t address);
|
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uint64_t constraint_count_ips(constraint_t *con, value_t value);
|
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uint32_t constraint_lookup_index(constraint_t *con, uint64_t index, value_t value);
|
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void constraint_paint_value(constraint_t *con, value_t value);
|
||||
|
||||
#endif //_CONSTRAINT_H
|
||||
|
||||
101
src/cyclic.c
101
src/cyclic.c
@ -57,28 +57,65 @@
|
||||
#include "aesrand.h"
|
||||
|
||||
#define LSRC "cyclic"
|
||||
#define PRIME 4294967311 // 2^32 + 15
|
||||
#define KNOWN_PRIMROOT 3
|
||||
|
||||
// distinct prime factors of 2^32 + 15
|
||||
static const uint64_t psub1_f[] = { 2, 3, 5, 131, 364289 };
|
||||
typedef struct cyclic_group {
|
||||
uint64_t prime;
|
||||
uint64_t known_primroot;
|
||||
size_t num_prime_factors; // number of unique prime factors of (prime-1)
|
||||
uint64_t prime_factors[10]; // unique prime factors of (prime-1)
|
||||
} cyclic_group_t;
|
||||
|
||||
// selected primitive root that we'll use as the generator
|
||||
// We will pick the first cyclic group from this list that is
|
||||
// larger than the number of IPs in our whitelist. E.g. for an
|
||||
// entire Internet scan, this would be cyclic32
|
||||
// Note: this list should remain ordered by size (primes) ascending.
|
||||
static cyclic_group_t groups[] = {
|
||||
{ // 2^16 + 1
|
||||
.prime = 65537,
|
||||
.known_primroot = 3,
|
||||
.prime_factors = {2},
|
||||
.num_prime_factors = 1
|
||||
},
|
||||
{ // 2^24 + 43
|
||||
.prime = 16777259,
|
||||
.known_primroot = 2,
|
||||
.prime_factors = {2, 23, 103, 3541},
|
||||
.num_prime_factors = 4
|
||||
},
|
||||
{ // 2^28 + 3
|
||||
.prime = 268435459,
|
||||
.known_primroot = 2,
|
||||
.prime_factors = {2, 3, 19, 87211},
|
||||
.num_prime_factors = 4
|
||||
},
|
||||
{ // 2^32 + 15
|
||||
.prime = 4294967311,
|
||||
.known_primroot = 3,
|
||||
.prime_factors = {2, 3, 5, 131, 364289},
|
||||
.num_prime_factors = 5
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
// selected prime/primitive root that we'll use as the generator
|
||||
static uint64_t prime = 0;
|
||||
static uint64_t primroot = 0;
|
||||
static uint64_t current = 0;
|
||||
|
||||
static uint64_t num_addrs = 0;
|
||||
|
||||
#define COPRIME 1
|
||||
#define NOT_COPRIME 0
|
||||
|
||||
// check whether two integers are coprime
|
||||
static int check_coprime(uint64_t check)
|
||||
static int check_coprime(uint64_t check, const cyclic_group_t *group)
|
||||
{
|
||||
for (unsigned i=0; i < sizeof(psub1_f)/sizeof(psub1_f[0]); i++) {
|
||||
if (psub1_f[i] > check && !(psub1_f[i] % check)) {
|
||||
for (unsigned i=0; i < group->num_prime_factors; i++) {
|
||||
if (group->prime_factors[i] > check && !(group->prime_factors[i] % check)) {
|
||||
return NOT_COPRIME;
|
||||
} else if (psub1_f[i] < check && !(check % psub1_f[i])) {
|
||||
} else if (group->prime_factors[i] < check && !(check % group->prime_factors[i])) {
|
||||
return NOT_COPRIME;
|
||||
} else if (psub1_f[i] == check) {
|
||||
} else if (group->prime_factors[i] == check) {
|
||||
return NOT_COPRIME;
|
||||
}
|
||||
}
|
||||
@ -86,18 +123,18 @@ static int check_coprime(uint64_t check)
|
||||
}
|
||||
|
||||
// find gen of cyclic group Z modulo PRIME
|
||||
static uint64_t find_primroot(void)
|
||||
static uint64_t find_primroot(const cyclic_group_t *group)
|
||||
{
|
||||
// what luck, rand() returns a uint32_t!
|
||||
uint32_t candidate = (uint32_t) aesrand_getword() & 0xFFFF;
|
||||
while(check_coprime(candidate) != COPRIME) {
|
||||
while(check_coprime(candidate, group) != COPRIME) {
|
||||
++candidate;
|
||||
}
|
||||
// pre-modded result is gigantic so use GMP
|
||||
mpz_t base, power, prime, primroot;
|
||||
mpz_init_set_d(base, (double) KNOWN_PRIMROOT);
|
||||
mpz_init_set_d(base, (double) group->known_primroot);
|
||||
mpz_init_set_d(power, (double) candidate);
|
||||
mpz_init_set_d(prime, (double) PRIME);
|
||||
mpz_init_set_d(prime, (double) group->prime);
|
||||
mpz_init(primroot);
|
||||
mpz_powm(primroot, base, power, prime);
|
||||
uint64_t retv = (uint64_t) mpz_get_ui(primroot);
|
||||
@ -112,6 +149,24 @@ int cyclic_init(uint32_t primroot_, uint32_t current_)
|
||||
{
|
||||
assert(!(!primroot_ && current_));
|
||||
|
||||
// Initialize blacklist
|
||||
if (blacklist_init_from_files(zconf.whitelist_filename,
|
||||
zconf.blacklist_filename)) {
|
||||
return -1;
|
||||
}
|
||||
num_addrs = blacklist_count_allowed();
|
||||
|
||||
uint32_t i;
|
||||
const cyclic_group_t *cur_group = NULL;
|
||||
for (i=0; i<sizeof(groups)/sizeof(groups[0]); i++) {
|
||||
if (groups[i].prime > num_addrs) {
|
||||
cur_group = &groups[i];
|
||||
log_debug("cyclic", "using prime %lu, known_primroot %lu", cur_group->prime, cur_group->known_primroot);
|
||||
prime = groups[i].prime;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (zconf.use_seed) {
|
||||
aesrand_init(zconf.seed+1);
|
||||
} else {
|
||||
@ -119,7 +174,7 @@ int cyclic_init(uint32_t primroot_, uint32_t current_)
|
||||
}
|
||||
if (!primroot_) {
|
||||
do {
|
||||
primroot = find_primroot();
|
||||
primroot = find_primroot(cur_group);
|
||||
} while (primroot >= (1LL << 32));
|
||||
log_debug(LSRC, "primitive root: %lld", primroot);
|
||||
current = (uint32_t) aesrand_getword() & 0xFFFF;
|
||||
@ -140,11 +195,6 @@ int cyclic_init(uint32_t primroot_, uint32_t current_)
|
||||
}
|
||||
}
|
||||
zconf.generator = primroot;
|
||||
if (blacklist_init_from_files(zconf.whitelist_filename,
|
||||
zconf.blacklist_filename)) {
|
||||
return -1;
|
||||
}
|
||||
|
||||
// make sure current is an allowed ip
|
||||
cyclic_get_next_ip();
|
||||
|
||||
@ -153,7 +203,7 @@ int cyclic_init(uint32_t primroot_, uint32_t current_)
|
||||
|
||||
uint32_t cyclic_get_curr_ip(void)
|
||||
{
|
||||
return (uint32_t) current;
|
||||
return (uint32_t) blacklist_lookup_index(current-1);
|
||||
}
|
||||
|
||||
uint32_t cyclic_get_primroot(void)
|
||||
@ -165,7 +215,7 @@ static inline uint32_t cyclic_get_next_elem(void)
|
||||
{
|
||||
do {
|
||||
current *= primroot;
|
||||
current %= PRIME;
|
||||
current %= prime;
|
||||
} while (current >= (1LL << 32));
|
||||
return (uint32_t) current;
|
||||
}
|
||||
@ -174,11 +224,10 @@ uint32_t cyclic_get_next_ip(void)
|
||||
{
|
||||
while (1) {
|
||||
uint32_t candidate = cyclic_get_next_elem();
|
||||
if (!blacklist_is_allowed(candidate)) {
|
||||
zsend.blacklisted++;
|
||||
} else {
|
||||
return candidate;
|
||||
if (candidate-1 < num_addrs) {
|
||||
return blacklist_lookup_index(candidate-1);
|
||||
}
|
||||
zsend.blacklisted++;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user