adding ability to scan specific CIDR blocks or addresses.

lib/blacklist.c

@@ -51,7 +51,38 @@ void whitelist_prefix(char *ip, int prefix_len)
 	constraint_set(constraint, ntohl(inet_addr(ip)), prefix_len, ADDR_ALLOWED);
 }
 
-static int init(char *file, const char *name, int value)
+static int init_from_string(char *ip, int value)
+{
+	int prefix_len = 32;
+	char *slash = strchr(ip, '/');
+	if (slash) {  // split apart network and prefix length 
+		*slash = '\0';
+		char *end;
+		char *len = slash+1;
+		errno = 0;			
+		prefix_len = strtol(len, &end, 10);
+		if (end == len || errno != 0 || prefix_len < 0 || prefix_len > 32) {
+			log_fatal("constraint", "'%s' is not a valid prefix length", len);
+			return -1;
+		}
+	}
+	struct in_addr addr;
+	if (inet_aton(ip, &addr) == 0) {
+		log_error("constraint", "'%s' is not a valid IP address", ip);
+		return -1;
+	}
+	constraint_set(constraint, ntohl(addr.s_addr), prefix_len, value);
+	char *name;
+	if (value == ADDR_DISALLOWED)
+		name = "blacklisting";
+	else
+		name = "whitelisting";
+	log_trace(name, "%s %s/%i",
+			  name, ip, prefix_len);
+}
+
+
+static int init_from_file(char *file, const char *name, int value)
 {
 	FILE *fp;
 	char line[1000];
@@ -70,31 +101,22 @@ static int init(char *file, const char *name, int value)
 		if ((sscanf(line, "%32s", ip)) == EOF) {
 			continue;
 		}
-		int prefix_len = 32;
+		if (init_from_string(ip, value)) {
-		char *slash = strchr(ip, '/');
+			log_fatal(name, "unable to parse %s file: %s", name, file);
-		if (slash) {  // split apart network and prefix length 
-			*slash = '\0';
-			char *end;
-			char *len = slash+1;
-			errno = 0;			
-			prefix_len = strtol(len, &end, 10);
-			if (end == len || errno != 0 || prefix_len < 0 || prefix_len > 32) {
-				log_fatal(name, "Unable to parse %s file: %s ('%s' is not a valid prefix length)",  name, file, len);
 		}
 	}
-		struct in_addr addr;
-		if (inet_aton(ip, &addr) == 0) {
-			log_fatal(name,  "Unable to parse %s file: %s ('%s' is not a valid IP address)",  name, file, ip);
-		}
-		constraint_set(constraint, ntohl(addr.s_addr), prefix_len, value);
-		log_trace(name, "%sing %s/%i",
-				  name, ip, prefix_len);
-	}
 	fclose(fp);
 
 	return 0;
 }
 
+void static init_from_array(char **cidrs, size_t len, int value)
+{
+	for (int i=0; i < (int) len; i++) {
+		init_from_string(cidrs[i], value);
+	}
+}
+
 uint64_t blacklist_count_allowed()
 {
 	assert(constraint);
@@ -107,42 +129,43 @@ uint64_t blacklist_count_not_allowed()
 	return constraint_count_ips(constraint, ADDR_DISALLOWED);
 }
 
-
 // Initialize address constraints from whitelist and blacklist files.
 // Either can be set to NULL to omit.
-int blacklist_init_from_files(char *whitelist_filename, char *blacklist_filename)
+int blacklist_init(char *whitelist_filename, char *blacklist_filename,
+		char **whitelist_entries, size_t whitelist_entries_len,
+		char **blacklist_entries, size_t blacklist_entries_len)
 {
 	assert(!constraint);
-	if (whitelist_filename) {
+	if (whitelist_filename && whitelist_entries) {
+		log_warn("whitelist", "both a whitelist file and destination addresses "
+					"were specified. The union of these two sources "
+					"will be utilized.");
+	}
+	if (whitelist_filename || whitelist_entries) {
 		// using a whitelist, so default to allowing nothing
 		constraint = constraint_init(ADDR_DISALLOWED);
 		log_trace("whitelist", "blacklisting 0.0.0.0/0");
-		init(whitelist_filename, "whitelist", ADDR_ALLOWED);
+		if (whitelist_filename) {
+			init_from_file(whitelist_filename, "whitelist", ADDR_ALLOWED);
+		}
+		if (whitelist_entries) {
+			init_from_array(whitelist_entries,
+					whitelist_entries_len, ADDR_ALLOWED);
+		}
 	} else {
 		// no whitelist, so default to allowing everything
 		constraint = constraint_init(ADDR_ALLOWED);
 	}
 	if (blacklist_filename) {
-		init(blacklist_filename, "blacklist", ADDR_DISALLOWED);
+		init_from_file(blacklist_filename, "blacklist", ADDR_DISALLOWED);
+	}
+	if (blacklist_entries) {
+		init_from_array(blacklist_entries, blacklist_entries_len, ADDR_DISALLOWED);
 	}
 	constraint_paint_value(constraint, ADDR_ALLOWED);
 	uint64_t allowed = blacklist_count_allowed();
 	log_debug("blacklist", "%lu addresses allowed to be scanned (%0.0f%% of address space)", 
 			  allowed, allowed*100./((long long int)1 << 32));
-
+	return EXIT_SUCCESS;
-	/*
-	// test
-	log_debug("blacklist", "testing started");
-	uint64_t count = constraint_count_ips(constraint, ADDR_ALLOWED);
-	for (unsigned int i=0; i < count; i++) {
-		int ip = constraint_lookup_index(constraint, i, ADDR_ALLOWED);
-		if ((i & 0xFFFFFF) == 0)
-			log_info("blacklist", "%x", i & 0xFF000000);
-		if (constraint_lookup_ip(constraint, ip) != ADDR_ALLOWED) {
-			log_error("blacklist", "test failed for index %d", i);
-		}
-	}
-	log_debug("blacklist", "testing complete");
-	*/
-	return 0;
 }
+

lib/blacklist.h

@@ -1,3 +1,4 @@
+#include <stdlib.h>
 #include <stdint.h>
 
 #ifndef BLACKLIST_H
@@ -7,7 +8,11 @@ uint32_t blacklist_lookup_index(uint64_t index);
 int blacklist_is_allowed(uint32_t s_addr);
 void blacklist_prefix(char *ip, int prefix_len);
 void whitelist_prefix(char *ip, int prefix_len);
-int blacklist_init_from_files(char *whitelist, char*blacklist);
+int blacklist_init(char *whitelist, char *blacklist,
+		char **whitelist_entries,
+		size_t whitelist_entries_len,
+		char **blacklist_entries,
+		size_t blacklist_entries_len);
 uint64_t blacklist_count_allowed();
 uint64_t blacklist_count_not_allowed();
 

lib/pbm.c

@@ -0,0 +1,54 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "logger.h"
+
+#define NUM_VALUES 0xFFFFFFFF
+#define PAGE_SIZE 0xFFFF
+#define NUM_PAGES (NUM_VALUES / PAGE_SIZE)
+#define SIZE (8*sizeof(uint64_t))
+
+uint64_t** pbm_init(void)
+{
+	uint64_t** retv = calloc(NUM_PAGES, sizeof(void*));
+	if (!retv) {
+		log_fatal("pbm", "unable to allocate memory for base page table");
+	}
+	return retv;
+}
+
+static int bm_check(uint64_t *bm, uint32_t v)
+{
+	return bm[v/SIZE] & (1<< (v % SIZE));
+}
+
+static void bm_set(uint64_t *bm, uint32_t v) 
+{
+	bm[v/SIZE] |= (1 << (v % SIZE));
+}
+
+int pbm_check(uint64_t **b, uint32_t v)
+{
+	uint32_t top = v >> 16;
+	uint32_t bottom = v & PAGE_SIZE;
+	return b[top] && bm_check(b[top], bottom);
+}
+
+void pbm_set(uint64_t **b, uint32_t v)
+{
+	uint32_t top = v >> 16;
+	uint32_t bottom = v & PAGE_SIZE;
+	if (!b[top]) {
+		uint64_t *bm = malloc(PAGE_SIZE);
+		if (!bm) {
+			log_fatal("bpm", "unable to allocate memory for new bitmap page");
+		}
+		memset(bm, 0, PAGE_SIZE);
+		b[top] = bm;
+	}
+	bm_set(b[top], bottom);
+}
+

lib/pbm.h

@@ -0,0 +1,5 @@
+#include <stdint.h>
+
+uint64_t** pbm_init(void);
+int pbm_check(uint64_t **b, uint32_t v);
+void pbm_set(uint64_t **b, uint32_t v);

src/CMakeLists.txt

@@ -9,6 +9,7 @@ SET(LIB_SOURCES
 	${PROJECT_SOURCE_DIR}/lib/blacklist.c
 	${PROJECT_SOURCE_DIR}/lib/constraint.c
 	${PROJECT_SOURCE_DIR}/lib/logger.c
+	${PROJECT_SOURCE_DIR}/lib/pbm.c
 	${PROJECT_SOURCE_DIR}/lib/random.c
 	${PROJECT_SOURCE_DIR}/lib/rijndael-alg-fst.c
 )
@@ -67,7 +68,7 @@ if (WITH_REDIS)
 endif()
 
 add_custom_command(OUTPUT zopt.h
-	COMMAND gengetopt -C --no-help --no-version -i "${CMAKE_CURRENT_SOURCE_DIR}/zopt.ggo" -F "${CMAKE_CURRENT_BINARY_DIR}/zopt"
+	COMMAND gengetopt -C --no-help --no-version --unamed-opts=SUBNETS -i "${CMAKE_CURRENT_SOURCE_DIR}/zopt.ggo" -F "${CMAKE_CURRENT_BINARY_DIR}/zopt"
 	)
 
 add_executable(zmap ${SOURCES})

src/cyclic.c

@@ -148,17 +148,25 @@ static uint64_t find_primroot(const cyclic_group_t *group)
 int cyclic_init(uint32_t primroot_, uint32_t current_)
 {
 	assert(!(!primroot_ && current_));
-
 	// Initialize blacklist
-	if (blacklist_init_from_files(zconf.whitelist_filename,
+	if (blacklist_init(zconf.whitelist_filename, zconf.blacklist_filename,
-							zconf.blacklist_filename)) {
+			zconf.destination_cidrs, zconf.destination_cidrs_len,
+			NULL, 0)) {
 		return -1;
 	}
 	num_addrs = blacklist_count_allowed();
+	if (!num_addrs) {
+		log_error("blacklist", "no addresses are eligible to be scanned in the "
+				"current configuration. This may be because the "
+				"blacklist being used by ZMap (%s) prevents "
+				"any addresses from receiving probe packets.",
+				zconf.blacklist_filename
+			);
+		exit(EXIT_FAILURE);
+	}
 
-	uint32_t i;
 	const cyclic_group_t *cur_group = NULL;
-	for (i=0; i<sizeof(groups)/sizeof(groups[0]); i++) {
+	for (uint32_t 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);

src/recv.c

@@ -30,6 +30,7 @@
 #include <assert.h>
 
 #include "../lib/logger.h"
+#include "../lib/pbm.h"
 
 #include "state.h"
 #include "validate.h"
@@ -44,20 +45,7 @@ static uint32_t num_src_ports;
 static pcap_t *pc = NULL;
 
 // bitmap of observed IP addresses
-static uint64_t *ip_seen = NULL;
+static uint64_t **seen = NULL;
-static const int IP_SEEN_SIZE = 0x4000000; // == 2^32/64
-
-// check if we've received a response from this address previously
-static inline int check_ip(uint32_t ip)
-{
-	return (ip_seen[ip >> 6] >> (ip & 0x3F)) & 1;
-}
-
-// set that we've received a response from the address
-static inline void set_ip(uint32_t ip)
-{
-	ip_seen[ip >> 6] |= (uint64_t)1 << (ip & 0x3F);
-}
 
 static u_char fake_eth_hdr[65535];
 
@@ -95,7 +83,7 @@ void packet_cb(u_char __attribute__((__unused__)) *user,
 		return;
 	}
 
-	int is_repeat = check_ip(src_ip);
+	int is_repeat = pbm_check(seen, ntohl(src_ip));
 
 	fieldset_t *fs = fs_new_fieldset();
 	fs_add_ip_fields(fs, ip_hdr);
@@ -121,7 +109,7 @@ void packet_cb(u_char __attribute__((__unused__)) *user,
 		zrecv.success_total++;
 		if (!is_repeat) {
 			zrecv.success_unique++;
-			set_ip(src_ip);
+			pbm_set(seen, ntohl(src_ip));
 		}
 		if (zsend.complete) {
 			zrecv.cooldown_total++;
@@ -176,10 +164,6 @@ int recv_run(pthread_mutex_t *recv_ready_mutex)
 {
 	log_debug("recv", "thread started");
 	num_src_ports = zconf.source_port_last - zconf.source_port_first + 1;
-	ip_seen = calloc(IP_SEEN_SIZE, sizeof(uint64_t));
-	if (!ip_seen) {
-		log_fatal("recv", "could not allocate address bitmap");
-	}
 	log_debug("recv", "using dev %s", zconf.iface);
 	if (!zconf.dryrun) {
 		char errbuf[PCAP_ERRBUF_SIZE];
@@ -202,6 +186,8 @@ int recv_run(pthread_mutex_t *recv_ready_mutex)
 		memset(fake_eth_hdr, 0, sizeof(fake_eth_hdr));
 		eth->h_proto = htons(ETH_P_IP);
 	}
+	// initialize paged bitmap
+	seen = pbm_init();
 	log_debug("recv", "receiver ready");
 	if (zconf.filter_duplicates) {
 		log_debug("recv", "duplicate responses will be excluded from output"); 

src/state.h

@@ -77,6 +77,8 @@ struct state_conf {
 	char *output_filename;
 	char *blacklist_filename;
 	char *whitelist_filename;
+	char **destination_cidrs;
+	int destination_cidrs_len;
 	char *raw_output_fields;
 	char **output_fields;
 	struct fieldset_conf fsconf;

src/zmap.c

@@ -180,8 +180,6 @@ static void summary(void)
 static void start_zmap(void)
 {
 	log_info("zmap", "started");
-
-	// finish setting up configuration
 	if (zconf.iface == NULL) {
 		char errbuf[PCAP_ERRBUF_SIZE];
 		char *iface = pcap_lookupdev(errbuf);
@@ -223,7 +221,6 @@ static void start_zmap(void)
 				  zconf.gw_mac[0], zconf.gw_mac[1], zconf.gw_mac[2],
 				  zconf.gw_mac[3], zconf.gw_mac[4], zconf.gw_mac[5]);
 	}
-
 	// initialization
 	if (zconf.output_module && zconf.output_module->init) {
 		zconf.output_module->init(&zconf, zconf.output_fields,
@@ -446,7 +443,6 @@ int main(int argc, char *argv[])
 				CMDLINE_PARSER_PACKAGE, args.probe_module_arg);
 	  exit(EXIT_FAILURE);
 	}
-
 	// now that we know the probe module, let's find what it supports
 	memset(&zconf.fsconf, 0, sizeof(struct fieldset_conf));
 	// the set of fields made available to a user is constructed
@@ -498,6 +494,7 @@ int main(int argc, char *argv[])
 			&zconf.fsconf.defs, zconf.output_fields,
 			zconf.output_fields_len);
 
+
 	SET_BOOL(zconf.dryrun, dryrun);
 	SET_BOOL(zconf.quiet, quiet);
 	SET_BOOL(zconf.summary, summary);
@@ -505,7 +502,6 @@ int main(int argc, char *argv[])
 	zconf.senders = args.sender_threads_arg;
 	SET_IF_GIVEN(zconf.output_filename, output_file);
 	SET_IF_GIVEN(zconf.blacklist_filename, blacklist_file);
-	SET_IF_GIVEN(zconf.whitelist_filename, whitelist_file);
 	SET_IF_GIVEN(zconf.probe_args, probe_args);
 	SET_IF_GIVEN(zconf.output_args, output_args);
 	SET_IF_GIVEN(zconf.iface, interface);
@@ -514,6 +510,18 @@ int main(int argc, char *argv[])
 	SET_IF_GIVEN(zconf.rate, rate);
 	SET_IF_GIVEN(zconf.packet_streams, probes);
 
+	// find if zmap wants any specific cidrs scanned instead
+	// of the entire Internet
+	zconf.destination_cidrs = args.inputs;
+	zconf.destination_cidrs_len = args.inputs_num;
+	if (zconf.destination_cidrs && zconf.blacklist_filename
+			&& !strcmp(zconf.blacklist_filename, "/etc/zmap/blacklist.conf")) {
+		log_warn("blacklist", "ZMap is currently using the default blacklist located "
+				"at /etc/zmap/blacklist.conf. By default, this blacklist excludes locally "
+				"scoped networks (e.g. 10.0.0.0/8, 127.0.0.1/8, and 192.168.0.0/16). If you are"
+				" trying to scan local networks, you can change the default blacklist by "
+				"editing the default ZMap configuration at /etc/zmap/zmap.conf.");
+	}
 	
 	if (zconf.probe_module->port_args) {
 		if (args.source_port_given) {

src/zopt.ggo

@@ -122,5 +122,6 @@ option "version"   		V "Print version and exit"
 
 text "\nExamples:\n\
      zmap -p 443  (scans the whole Internet for hosts with port 443 open)\n\
-     zmap -N 5 -B 10M -p 80 -o -  (find 5 HTTP servers, scanning at 10 Mb/s)"
+     zmap -N 5 -B 10M -p 80 -o -  (find 5 HTTP servers, scanning at 10 Mb/s)\n
-
+     zmap -p 80 10.0.0.0/8 192.168.0.0/16 -o (scan 10.0.0.0/8 and 192.168.0.0/16 on port 80)\n
+     zmap -p 80 192.168.1.2 192.168.1.3 (scan 192.168.1.2 and 192.168.1.3 on port 80)"