#include "nsock.h" #include "nmap_error.h" #include "NmapOps.h" #include "utils.h" #include "tcpip.h" #include "protocols.h" #include "libnetutil/netutil.h" #include "nse_nsock.h" #include "nse_main.h" #include "nse_utility.h" #include "nse_ssl_cert.h" #if HAVE_OPENSSL /* See the comments in service_scan.cc for the reason for _WINSOCKAPI_. */ # define _WINSOCKAPI_ # include #endif #include #include #include #include #include #define DEFAULT_TIMEOUT 30000 /* Upvalues for library variables */ enum { NSOCK_POOL = lua_upvalueindex(1), NSOCK_SOCKET = lua_upvalueindex(2), /* nsock socket metatable */ PCAP_SOCKET = lua_upvalueindex(3), /* pcap socket metatable */ THREAD_SOCKETS = lua_upvalueindex(4), /* */ CONNECT_WAITING = lua_upvalueindex(5), /* Threads waiting to lock */ KEY_PCAP = lua_upvalueindex(6) /* Keys to pcap sockets */ }; /* Integer keys in the Nsock userdata environments */ #define THREAD_I 1 /* The thread that yielded */ #define BUFFER_I 2 /* Location of Userdata Buffer */ extern NmapOps o; typedef struct nse_nsock_udata { nsock_iod nsiod; unsigned timeout; lua_State *thread; int proto; int af; const char *direction; const char *action; void *ssl_session; struct sockaddr_storage source_addr; size_t source_addrlen; /* PCAP */ int is_pcap; nsock_event_id nseid; struct timeval recvtime; /* Time packet was received, if r_success is true */ } nse_nsock_udata; static int gc_pool (lua_State *L) { nsock_pool *nsp = (nsock_pool *) lua_touserdata(L, 1); assert(*nsp != NULL); nsp_delete(*nsp); *nsp = NULL; return 0; } static nsock_pool new_pool (lua_State *L) { nsock_pool nsp = nsp_new(NULL); nsock_pool *nspp; /* configure logging */ nsock_set_log_function(nsp, nmap_nsock_stderr_logger); nmap_adjust_loglevel(nsp, o.scriptTrace()); nsp_setdevice(nsp, o.device); if (o.proxy_chain) nsp_set_proxychain(nsp, o.proxy_chain); nsp_setbroadcast(nsp, true); nspp = (nsock_pool *) lua_newuserdata(L, sizeof(nsock_pool)); *nspp = nsp; lua_newtable(L); lua_pushcfunction(L, gc_pool); lua_setfield(L, -2, "__gc"); lua_setmetatable(L, -2); return nsp; } static nsock_pool get_pool (lua_State *L) { nsock_pool *nspp; nspp = (nsock_pool *) lua_touserdata(L, NSOCK_POOL); assert(nspp != NULL); assert(*nspp != NULL); return *nspp; } static std::string hexify (const unsigned char *str, size_t len) { size_t num = 0; std::ostringstream ret; // If more than 95% of the chars are printable, we escape unprintable chars for (size_t i = 0; i < len; i++) if (isprint((int) str[i])) num++; if ((double) num / (double) len >= 0.95) { for (size_t i = 0; i < len; i++) { if (isprint((int) str[i]) || isspace((int) str[i])) ret << str[i]; else ret << std::setw(3) << "\\" << (unsigned int) (unsigned char) str[i]; } return ret.str(); } ret << std::setbase(16) << std::setfill('0'); for (size_t i = 0; i < len; i += 16) { ret << std::setw(8) << i << ": "; for (size_t j = i; j < i + 16; j++) if (j < len) ret << std::setw(2) << (unsigned int) (unsigned char) str[j] << " "; else ret << " "; for (size_t j = i; j < i + 16 && j < len; j++) ret.put(isgraph((int) str[j]) ? (unsigned char) str[j] : ' '); ret << std::endl; } return ret.str(); } /* Some constants used for enforcing a limit on the number of open sockets * in use by threads. The maximum value between MAX_PARALLELISM and * o.max_parallelism is the max # of threads that can have connected sockets * (open). * * THREAD_SOCKETS is a weak keyed table of pairs. * A socket table is a weak keyed table (socket keys with garbage values) of * sockets the Thread has allocated but not necessarily open). You may * test for an open socket by checking whether its nsiod field in the * socket userdata structure is not NULL. * * CONNECT_WAITING is a weak keyed table of pairs. * The table contains threads waiting to make a socket connection. */ #define MAX_PARALLELISM 20 /* int socket_lock (lua_State *L) * * This function is called by l_connect to get a "lock" on a socket. * When connect calls this function, it expects socket_lock to yield forcing * connect to be restarted when resumed or it succeeds returning normally. */ static int socket_lock (lua_State *L, int idx) { unsigned p = o.max_parallelism == 0 ? MAX_PARALLELISM : o.max_parallelism; int top = lua_gettop(L); nse_base(L); lua_rawget(L, THREAD_SOCKETS); if (lua_istable(L, -1)) { /* Thread already has a "lock" with open sockets. Place the new socket * in its sockets table */ lua_pushvalue(L, idx); lua_pushboolean(L, true); lua_rawset(L, -3); } else if (nseU_tablen(L, THREAD_SOCKETS) <= p) { /* There is room for this thread to open sockets */ nse_base(L); nseU_weaktable(L, 0, 0, "k"); /* weak socket references */ lua_pushvalue(L, idx); /* socket */ lua_pushboolean(L, true); lua_rawset(L, -3); /* add to sockets table */ lua_rawset(L, THREAD_SOCKETS); /* add new Pair * to THREAD_SOCKETS */ } else { nse_base(L); lua_pushboolean(L, true); lua_rawset(L, CONNECT_WAITING); lua_settop(L, top); /* restore stack to original condition for l_connect */ return 0; } lua_settop(L, top); /* restore stack to original condition for l_connect */ return 1; } static void socket_unlock (lua_State *L) { int top = lua_gettop(L); lua_gc(L, LUA_GCSTOP, 0); /* don't collect threads during iteration */ for (lua_pushnil(L); lua_next(L, THREAD_SOCKETS); lua_pop(L, 1)) { unsigned open = 0; if (lua_status(lua_tothread(L, -2)) == LUA_YIELD) { for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1)) /* for each socket */ { if (((nse_nsock_udata *) lua_touserdata(L, -2))->nsiod != NULL) open++; } } if (open == 0) /* thread has no open sockets? */ { /* close all of its sockets */ for (lua_pushnil(L); lua_next(L, -2); lua_pop(L, 1)) /* for each socket */ { lua_getfield(L, -2, "close"); lua_pushvalue(L, -3); lua_call(L, 1, 0); } lua_pushvalue(L, -2); /* thread key */ lua_pushnil(L); lua_rawset(L, THREAD_SOCKETS); for (lua_pushnil(L); lua_next(L, CONNECT_WAITING); lua_pop(L, 1)) { nse_restore(lua_tothread(L, -2), 0); lua_pushvalue(L, -2); lua_pushnil(L); lua_rawset(L, CONNECT_WAITING); } } } lua_gc(L, LUA_GCRESTART, 0); lua_settop(L, top); } static const char *inet_ntop_both (int af, const void *v_addr, char *ipstring) { if (af == AF_INET) { inet_ntop(AF_INET, &((struct sockaddr_in *) v_addr)->sin_addr, ipstring, INET6_ADDRSTRLEN); return ipstring; } #ifdef HAVE_IPV6 else if (af == AF_INET6) { inet_ntop(AF_INET6, &((struct sockaddr_in6 *) v_addr)->sin6_addr, ipstring, INET6_ADDRSTRLEN); return ipstring; } #endif else return "unknown protocol"; } static unsigned short inet_port_both (int af, const void *v_addr) { int port; if (af == AF_INET) port = ((struct sockaddr_in *) v_addr)->sin_port; #ifdef HAVE_IPV6 else if (af == AF_INET6) port = ((struct sockaddr_in6 *) v_addr)->sin6_port; #endif else port = 0; return ntohs(port); } #define TO ">" #define FROM "<" static void trace (nsock_iod nsiod, const char *message, const char *dir) { if (o.scriptTrace()) { if (!nsi_is_pcap(nsiod)) { int protocol; int af; char ipstring_local[INET6_ADDRSTRLEN]; char ipstring_remote[INET6_ADDRSTRLEN]; struct sockaddr_storage local; struct sockaddr_storage remote; nsi_getlastcommunicationinfo(nsiod, &protocol, &af, (sockaddr *) &local, (sockaddr *) &remote, sizeof(sockaddr_storage)); log_write(LOG_STDOUT, "%s: %s %s:%d %s %s:%d | %s\n", SCRIPT_ENGINE, IPPROTO2STR_UC(protocol), inet_ntop_both(af, &local, ipstring_local), inet_port_both(af, &local), dir, inet_ntop_both(af, &remote, ipstring_remote), inet_port_both(af, &remote), message); } else { log_write(LOG_STDOUT, "%s: %s | %s\n", SCRIPT_ENGINE, dir, message); } } } static void status (lua_State *L, enum nse_status status) { switch (status) { case NSE_STATUS_SUCCESS: lua_pushboolean(L, true); nse_restore(L, 1); break; case NSE_STATUS_KILL: case NSE_STATUS_CANCELLED: return; /* do nothing! */ case NSE_STATUS_EOF: case NSE_STATUS_ERROR: case NSE_STATUS_TIMEOUT: case NSE_STATUS_PROXYERROR: lua_pushnil(L); lua_pushstring(L, nse_status2str(status)); nse_restore(L, 2); break; case NSE_STATUS_NONE: default: assert(0); break; } } static void callback (nsock_pool nsp, nsock_event nse, void *ud) { nse_nsock_udata *nu = (nse_nsock_udata *) ud; lua_State *L = nu->thread; assert(lua_status(L) == LUA_YIELD); trace(nse_iod(nse), nu->action, nu->direction); status(L, nse_status(nse)); } static int yield (lua_State *L, nse_nsock_udata *nu, const char *action, const char *direction, int ctx, lua_CFunction k) { lua_getuservalue(L, 1); lua_pushthread(L); lua_rawseti(L, -2, THREAD_I); lua_pop(L, 1); /* nsock udata environment */ nu->thread = L; nu->action = action; nu->direction = direction; return nse_yield(L, ctx, k); } /* In the case of unconnected UDP sockets, this function will call nsock_setup_udp on your behalf before returning true. */ static nse_nsock_udata *check_nsock_udata (lua_State *L, int idx, bool open) { nse_nsock_udata *nu = (nse_nsock_udata *) nseU_checkudata(L, idx, NSOCK_SOCKET, "nsock"); if (open && nu->nsiod == NULL) { /* The socket hasn't been connected or setup yet. Try doing a setup, or throw an error if that's not possible. */ if (nu->proto == IPPROTO_UDP) { nsock_pool nsp; nsp = get_pool(L); nu->nsiod = nsi_new(nsp, NULL); if (nu->source_addr.ss_family != AF_UNSPEC) { nsi_set_localaddr(nu->nsiod, &nu->source_addr, nu->source_addrlen); } else if (o.spoofsource) { struct sockaddr_storage ss; size_t sslen; o.SourceSockAddr(&ss, &sslen); nsi_set_localaddr(nu->nsiod, &ss, sslen); } if (o.ipoptionslen) nsi_set_ipoptions(nu->nsiod, o.ipoptions, o.ipoptionslen); if (nsock_setup_udp(nsp, nu->nsiod, nu->af) == -1) { luaL_error(L, "Error in setup of iod with proto %d and af %d: %s (%d)", nu->proto, nu->af, socket_strerror(socket_errno()), socket_errno()); } } } return nu; } /* If the socket udata nu is not open, return from the enclosing function with an error. */ #define NSOCK_UDATA_ENSURE_OPEN(L, nu) \ do { \ if (nu->nsiod == NULL) \ return nseU_safeerror(L, "socket must be connected"); \ } while (0) static int l_loop (lua_State *L) { nsock_pool nsp = get_pool(L); int tout = luaL_checkint(L, 1); socket_unlock(L); /* clean up old socket locks */ nmap_adjust_loglevel(nsp, o.scriptTrace()); if (nsock_loop(nsp, tout) == NSOCK_LOOP_ERROR) return luaL_error(L, "a fatal error occurred in nsock_loop"); return 0; } static int l_reconnect_ssl (lua_State *L) { nsock_pool nsp = get_pool(L); nse_nsock_udata *nu = check_nsock_udata(L, 1, true); NSOCK_UDATA_ENSURE_OPEN(L, nu); #ifndef HAVE_OPENSSL return nseU_safeerror(L, "sorry, you don't have OpenSSL"); #endif nsock_reconnect_ssl(nsp, nu->nsiod, callback, nu->timeout, nu, nu->ssl_session); return yield(L, nu, "SSL RECONNECT", TO, 0, NULL); } static void close_internal (lua_State *L, nse_nsock_udata *nu); static int l_connect (lua_State *L) { enum type {TCP, UDP, SSL}; static const char * const op[] = {"tcp", "udp", "ssl", NULL}; nsock_pool nsp = get_pool(L); nse_nsock_udata *nu = check_nsock_udata(L, 1, false); const char *addr, *targetname; nseU_checktarget(L, 2, &addr, &targetname); const char *default_proto = NULL; unsigned short port = nseU_checkport(L, 3, &default_proto); if (default_proto == NULL) { switch (nu->proto) { case IPPROTO_TCP: default_proto = "tcp"; break; case IPPROTO_UDP: default_proto = "udp"; break; default: default_proto = "tcp"; break; } } int what = luaL_checkoption(L, 4, default_proto, op); struct addrinfo *dest; int error_id; if (!socket_lock(L, 1)) /* we cannot get a socket lock */ return nse_yield(L, 0, l_connect); /* restart on continuation */ #ifndef HAVE_OPENSSL if (what == SSL) return nseU_safeerror(L, "sorry, you don't have OpenSSL"); #endif error_id = getaddrinfo(addr, NULL, NULL, &dest); if (error_id) return nseU_safeerror(L, gai_strerror(error_id)); if (dest == NULL) return nseU_safeerror(L, "getaddrinfo returned success but no addresses"); if (nu->nsiod != NULL) close_internal(L, nu); nu->nsiod = nsi_new(nsp, NULL); if (nu->source_addr.ss_family != AF_UNSPEC) { nsi_set_localaddr(nu->nsiod, &nu->source_addr, nu->source_addrlen); } else if (o.spoofsource) { struct sockaddr_storage ss; size_t sslen; o.SourceSockAddr(&ss, &sslen); nsi_set_localaddr(nu->nsiod, &ss, sslen); } if (o.ipoptionslen) nsi_set_ipoptions(nu->nsiod, o.ipoptions, o.ipoptionslen); if (targetname != NULL) { if (nsi_set_hostname(nu->nsiod, targetname) == -1) fatal("nsi_set_hostname(\"%s\" failed in %s()", targetname, __func__); } nu->af = dest->ai_addr->sa_family; switch (what) { case TCP: nu->proto = IPPROTO_TCP; if (o.socks4a) { nsock_connect_tcp_socks4a(nsp, nu->nsiod, callback, nu->timeout, nu, targetname, port); } else { nsock_connect_tcp(nsp, nu->nsiod, callback, nu->timeout, nu, dest->ai_addr, dest->ai_addrlen, port); } break; case UDP: nu->proto = IPPROTO_UDP; nsock_connect_udp(nsp, nu->nsiod, callback, nu, dest->ai_addr, dest->ai_addrlen, port); break; case SSL: nu->proto = IPPROTO_TCP; nsock_connect_ssl(nsp, nu->nsiod, callback, nu->timeout, nu, dest->ai_addr, dest->ai_addrlen, IPPROTO_TCP, port, nu->ssl_session); break; } if (dest != NULL) freeaddrinfo(dest); return yield(L, nu, "CONNECT", TO, 0, NULL); } static int l_send (lua_State *L) { nsock_pool nsp = get_pool(L); nse_nsock_udata *nu = check_nsock_udata(L, 1, true); NSOCK_UDATA_ENSURE_OPEN(L, nu); size_t size; const char *string = luaL_checklstring(L, 2, &size); trace(nu->nsiod, hexify((unsigned char *) string, size).c_str(), TO); nsock_write(nsp, nu->nsiod, callback, nu->timeout, nu, string, size); return yield(L, nu, "SEND", TO, 0, NULL); } static int l_sendto (lua_State *L) { nsock_pool nsp = get_pool(L); nse_nsock_udata *nu = check_nsock_udata(L, 1, true); NSOCK_UDATA_ENSURE_OPEN(L, nu); size_t size; const char *addr, *targetname; nseU_checktarget(L, 2, &addr, &targetname); const char *default_proto = NULL; unsigned short port = nseU_checkport(L, 3, &default_proto); const char *string = luaL_checklstring(L, 4, &size); int error_id; struct addrinfo *dest; error_id = getaddrinfo(addr, NULL, NULL, &dest); if (error_id) return nseU_safeerror(L, gai_strerror(error_id)); if (dest == NULL) return nseU_safeerror(L, "getaddrinfo returned success but no addresses"); nsock_sendto(nsp, nu->nsiod, callback, nu->timeout, nu, dest->ai_addr, dest->ai_addrlen, port, string, size); trace(nu->nsiod, hexify((unsigned char *) string, size).c_str(), TO); freeaddrinfo(dest); return yield(L, nu, "SEND", TO, 0, NULL); } static void receive_callback (nsock_pool nsp, nsock_event nse, void *udata) { nse_nsock_udata *nu = (nse_nsock_udata *) udata; lua_State *L = nu->thread; assert(lua_status(L) == LUA_YIELD); if (nse_status(nse) == NSE_STATUS_SUCCESS) { int len; const char *str = nse_readbuf(nse, &len); trace(nse_iod(nse), hexify((const unsigned char *) str, len).c_str(), FROM); lua_pushboolean(L, true); lua_pushlstring(L, str, len); nse_restore(L, 2); } else status(L, nse_status(nse)); /* will also restore the thread */ } static int l_receive (lua_State *L) { nsock_pool nsp = get_pool(L); nse_nsock_udata *nu = check_nsock_udata(L, 1, true); NSOCK_UDATA_ENSURE_OPEN(L, nu); nsock_read(nsp, nu->nsiod, receive_callback, nu->timeout, nu); return yield(L, nu, "RECEIVE", FROM, 0, NULL); } static int l_receive_lines (lua_State *L) { nsock_pool nsp = get_pool(L); nse_nsock_udata *nu = check_nsock_udata(L, 1, true); NSOCK_UDATA_ENSURE_OPEN(L, nu); nsock_readlines(nsp, nu->nsiod, receive_callback, nu->timeout, nu, luaL_checkint(L, 2)); return yield(L, nu, "RECEIVE LINES", FROM, 0, NULL); } static int l_receive_bytes (lua_State *L) { nsock_pool nsp = get_pool(L); nse_nsock_udata *nu = check_nsock_udata(L, 1, true); NSOCK_UDATA_ENSURE_OPEN(L, nu); nsock_readbytes(nsp, nu->nsiod, receive_callback, nu->timeout, nu, luaL_checkint(L, 2)); return yield(L, nu, "RECEIVE BYTES", FROM, 0, NULL); } static int l_receive_buf (lua_State *L) { nsock_pool nsp = get_pool(L); nse_nsock_udata *nu = check_nsock_udata(L, 1, true); NSOCK_UDATA_ENSURE_OPEN(L, nu); if (!(lua_type(L, 2) == LUA_TFUNCTION || lua_type(L, 2) == LUA_TSTRING)) nseU_typeerror(L, 2, "function/string"); luaL_checktype(L, 3, LUA_TBOOLEAN); /* 3 */ if (lua_getctx(L, NULL) == LUA_OK) { lua_settop(L, 3); /* clear top */ lua_getuservalue(L, 1); /* 4 */ lua_rawgeti(L, 4, BUFFER_I); /* 5 */ } else { /* Here we are returning from nsock_read below. * We have two extra values on the stack pushed by receive_callback. */ assert(lua_gettop(L) == 7); if (lua_toboolean(L, 6)) /* success? */ { lua_replace(L, 6); /* remove boolean */ lua_concat(L, 2); /* concat BUFFER_I with received data */ } else /* receive_callback encountered an error */ return 2; } if (lua_isfunction(L, 2)) { lua_pushvalue(L, 2); lua_pushvalue(L, 5); lua_call(L, 1, 2); /* we do not allow yields */ } else /* string */ { lua_getglobal(L, "string"); lua_getfield(L, -1, "find"); lua_replace(L, -2); lua_pushvalue(L, 5); lua_pushvalue(L, 2); lua_call(L, 2, 2); /* we do not allow yields */ } if (lua_isnumber(L, -2) && lua_isnumber(L, -1)) /* found end? */ { lua_Integer l = lua_tointeger(L, -2), r = lua_tointeger(L, -1); if (l > r || r > (lua_Integer) lua_rawlen(L, 5)) return luaL_error(L, "invalid indices for match"); lua_pushboolean(L, 1); if (lua_toboolean(L, 3)) lua_pushlstring(L, lua_tostring(L, 5), r); else lua_pushlstring(L, lua_tostring(L, 5), l-1); lua_pushlstring(L, lua_tostring(L, 5)+r, lua_rawlen(L, 5)-r); lua_rawseti(L, 4, BUFFER_I); return 2; } else { lua_pop(L, 2); /* pop 2 results */ nsock_read(nsp, nu->nsiod, receive_callback, nu->timeout, nu); return yield(L, nu, "RECEIVE BUF", FROM, 0, l_receive_buf); } } static int l_get_info (lua_State *L) { nse_nsock_udata *nu = check_nsock_udata(L, 1, true); NSOCK_UDATA_ENSURE_OPEN(L, nu); int protocol; // tcp or udp int af; // address family struct sockaddr_storage local; struct sockaddr_storage remote; char *ipstring_local = (char *) lua_newuserdata(L, sizeof(char) * INET6_ADDRSTRLEN); char *ipstring_remote = (char *) lua_newuserdata(L, sizeof(char) * INET6_ADDRSTRLEN); nsi_getlastcommunicationinfo(nu->nsiod, &protocol, &af, (struct sockaddr*)&local, (struct sockaddr*)&remote, sizeof(struct sockaddr_storage)); lua_pushboolean(L, true); lua_pushstring(L, inet_ntop_both(af, &local, ipstring_local)); lua_pushnumber(L, inet_port_both(af, &local)); lua_pushstring(L, inet_ntop_both(af, &remote, ipstring_remote)); lua_pushnumber(L, inet_port_both(af, &remote)); return 5; } static int l_set_timeout (lua_State *L) { nse_nsock_udata *nu = check_nsock_udata(L, 1, false); nu->timeout = luaL_checkint(L, 2); if ((int) nu->timeout < -1) /* -1 is no timeout */ return luaL_error(L, "Negative timeout: %d", nu->timeout); return nseU_success(L); } static int sleep_destructor (lua_State *L) { nsock_pool nsp = get_pool(L); nsock_event_id *neidp = (nsock_event_id *) lua_touserdata(L, 2); if (o.debugging >= 2) log_write(LOG_STDERR, "Destroying sleep callback.\n"); assert(neidp); int success = nsock_event_cancel(nsp, *neidp, 0); if (success) return nseU_success(L); else return nseU_safeerror(L, "could not cancel event"); } static void sleep_callback (nsock_pool nsp, nsock_event nse, void *ud) { lua_State *L = (lua_State *) ud; assert(lua_status(L) == LUA_YIELD); assert(nse_status(nse) == NSE_STATUS_SUCCESS); nse_restore(L, 0); } static int l_sleep (lua_State *L) { nsock_pool nsp = get_pool(L); double secs = luaL_checknumber(L, 1); int msecs; if (secs < 0) luaL_error(L, "argument to sleep (%f) must not be negative\n", secs); /* Convert to milliseconds for nsock_timer_create. */ msecs = (int) (secs * 1000 + 0.5); nsock_event_id *neidp = (nsock_event_id *) lua_newuserdata(L, sizeof(nsock_event_id *)); *neidp = nsock_timer_create(nsp, sleep_callback, msecs, L); lua_pushvalue(L, NSOCK_POOL); lua_pushcclosure(L, sleep_destructor, 1); nse_destructor(L, 'a'); return nse_yield(L, 0, NULL); } #if HAVE_OPENSSL SSL *nse_nsock_get_ssl (lua_State *L) { nse_nsock_udata *nu = check_nsock_udata(L, 1, false); if (nu->nsiod == NULL || !nsi_checkssl(nu->nsiod)) luaL_argerror(L, 1, "not a SSL socket"); return (SSL *) nsi_getssl(nu->nsiod); } #else /* If HAVE_OPENSSL is defined, this comes from nse_ssl_cert.cc. */ int l_get_ssl_certificate (lua_State *L) { return luaL_error(L, "SSL is not available"); } #endif /* Set the local address for socket operations. The two optional parameters after the first (which is the socket object) are a string representing a numeric address, and a port number. If either optional parameter is omitted or nil, that part of the address will be left unspecified. */ static int l_bind (lua_State *L) { nse_nsock_udata *nu = check_nsock_udata(L, 1, false); struct addrinfo hints = { 0 }; struct addrinfo *results; const char *addr_str = luaL_optstring(L, 2, NULL); luaL_checkint(L, 3); const char *port_str = lua_tostring(L, 3); /* automatic conversion */ int rc; /* If we don't have a string to work with, set our configured address family to get the proper unspecified address (0.0.0.0 or ::). Otherwise infer the family from the string. */ if (addr_str == NULL) hints.ai_family = o.af(); else hints.ai_family = AF_UNSPEC; /* AI_NUMERICHOST: don't use DNS to resolve names. AI_PASSIVE: set an unspecified address if addr_str is NULL. */ hints.ai_flags = AI_NUMERICHOST | AI_PASSIVE; rc = getaddrinfo(addr_str, port_str, &hints, &results); if (rc != 0) return nseU_safeerror(L, gai_strerror(rc)); if (results == NULL) return nseU_safeerror(L, "getaddrinfo: no results found"); if (results->ai_addrlen > sizeof(nu->source_addr)) { freeaddrinfo(results); return nseU_safeerror(L, "getaddrinfo: result is too big"); } /* We ignore any results after the first. */ /* We would just call nsi_set_localaddr here, but nu->nsiod is not created until connect. So store the address in the userdatum. */ nu->source_addrlen = results->ai_addrlen; memcpy(&nu->source_addr, results->ai_addr, nu->source_addrlen); return nseU_success(L); } static const char *default_af_string(int af) { if (af == AF_INET) return "inet"; else return "inet6"; } static void initialize (lua_State *L, int idx, nse_nsock_udata *nu, int proto, int af) { lua_createtable(L, 2, 0); /* room for thread in array */ lua_pushliteral(L, ""); lua_rawseti(L, -2, BUFFER_I); lua_setuservalue(L, idx); nu->nsiod = NULL; nu->proto = proto; nu->af = af; nu->ssl_session = NULL; nu->source_addr.ss_family = AF_UNSPEC; nu->source_addrlen = sizeof(nu->source_addr); nu->timeout = DEFAULT_TIMEOUT; nu->is_pcap = 0; nu->thread = NULL; nu->direction = nu->action = NULL; } static int l_new (lua_State *L) { static const char *proto_strings[] = { "tcp", "udp", NULL }; int proto_map[] = { IPPROTO_TCP, IPPROTO_UDP }; static const char *af_strings[] = { "inet", "inet6", NULL }; int af_map[] = { AF_INET, AF_INET6 }; int proto, af; nse_nsock_udata *nu; proto = proto_map[luaL_checkoption(L, 1, "tcp", proto_strings)]; af = af_map[luaL_checkoption(L, 2, default_af_string(o.af()), af_strings)]; lua_settop(L, 0); nu = (nse_nsock_udata *) lua_newuserdata(L, sizeof(nse_nsock_udata)); lua_pushvalue(L, NSOCK_SOCKET); lua_setmetatable(L, -2); initialize(L, 1, nu, proto, af); return 1; } /* Common subfunction to l_close and l_connect. l_connect calls this when a second attempt is made to connect a socket that has already had a connection attempt. */ static void close_internal (lua_State *L, nse_nsock_udata *nu) { trace(nu->nsiod, "CLOSE", TO); #ifdef HAVE_OPENSSL if (nu->ssl_session) SSL_SESSION_free((SSL_SESSION *) nu->ssl_session); #endif if (!nu->is_pcap) { /* pcap sockets are closed by pcap_gc */ nsi_delete(nu->nsiod, NSOCK_PENDING_NOTIFY); nu->nsiod = NULL; } } static int l_close (lua_State *L) { nse_nsock_udata *nu = check_nsock_udata(L, 1, false); if (nu->nsiod == NULL) return nseU_safeerror(L, "socket already closed"); close_internal(L, nu); initialize(L, 1, nu, nu->proto, nu->af); return nseU_success(L); } static int nsock_gc (lua_State *L) { nse_nsock_udata *nu = check_nsock_udata(L, 1, false); if (nu->nsiod) return l_close(L); return 0; } /****************** PCAP_SOCKET ***********************************************/ static void dnet_to_pcap_device_name (lua_State *L, const char *device) { if (strcmp(device, "any") == 0) lua_pushliteral(L, "any"); else #ifdef WIN32 { char pcapdev[4096]; /* Nmap normally uses device names obtained through dnet for interfaces, but Pcap has its own naming system. So the conversion is done here */ if (!DnetName2PcapName(device, pcapdev, sizeof(pcapdev))) lua_pushstring(L, device); else lua_pushstring(L, pcapdev); } #else lua_pushstring(L, device); #endif } static int pcap_gc (lua_State *L) { nsock_iod *nsiod = (nsock_iod *) lua_touserdata(L, 1); nsi_delete(*nsiod, NSOCK_PENDING_NOTIFY); *nsiod = NULL; return 0; } static int l_pcap_open (lua_State *L) { nsock_pool nsp = get_pool(L); nse_nsock_udata *nu = check_nsock_udata(L, 1, false); const char *device = luaL_checkstring(L, 2); int snaplen = luaL_checkint(L, 3); luaL_checktype(L, 4, LUA_TBOOLEAN); /* promiscuous */ const char *bpf = luaL_checkstring(L, 5); lua_settop(L, 5); dnet_to_pcap_device_name(L, device); /* 6 */ lua_pushfstring(L, "%s|%d|%d|%s", lua_tostring(L, 6), snaplen, lua_toboolean(L, 4), lua_tostring(L, 5)); /* 7, the pcap socket key */ if (nu->nsiod) luaL_argerror(L, 1, "socket is already open"); if (lua_rawlen(L, 6) == 0) luaL_argerror(L, 2, "bad device name"); lua_pushvalue(L, 7); lua_rawget(L, KEY_PCAP); nsock_iod *nsiod = (nsock_iod *) lua_touserdata(L, -1); if (nsiod == NULL) /* does not exist */ { int rc; lua_pop(L, 1); /* the nonexistant socket */ nsiod = (nsock_iod *) lua_newuserdata(L, sizeof(nsock_iod)); lua_pushvalue(L, PCAP_SOCKET); lua_setmetatable(L, -2); *nsiod = nsi_new(nsp, nu); lua_pushvalue(L, 7); /* the pcap socket key */ lua_pushvalue(L, -2); /* the pcap socket nsiod */ lua_rawset(L, KEY_PCAP); /* KEY_PCAP["dev|snap|promis|bpf"] = pcap_nsiod */ rc = nsock_pcap_open(nsp, *nsiod, lua_tostring(L, 6), snaplen, lua_toboolean(L, 4), bpf); if (rc) luaL_error(L, "can't open pcap reader on %s", device); } lua_getuservalue(L, 1); /* the socket user value */ lua_pushvalue(L, -2); /* the pcap socket nsiod */ lua_pushboolean(L, 1); /* dummy variable */ lua_rawset(L, -3); nu->nsiod = *nsiod; nu->is_pcap = 1; return 0; } static void pcap_receive_handler (nsock_pool nsp, nsock_event nse, void *ud) { nse_nsock_udata *nu = (nse_nsock_udata *) ud; lua_State *L = nu->thread; assert(lua_status(L) == LUA_YIELD); if (nse_status(nse) == NSE_STATUS_SUCCESS) { const unsigned char *l2_data, *l3_data; size_t l2_len, l3_len, packet_len; struct timeval tv; nse_readpcap(nse, &l2_data, &l2_len, &l3_data, &l3_len, &packet_len, &tv); lua_pushboolean(L, 1); lua_pushinteger(L, packet_len); lua_pushlstring(L, (const char *) l2_data, l2_len); lua_pushlstring(L, (const char *) l3_data, l3_len); lua_pushnumber(L, TIMEVAL_SECS(tv)); nse_restore(L, 5); } else status(L, nse_status(nse)); /* will also restore the thread */ } static int l_pcap_receive (lua_State *L) { nsock_pool nsp = get_pool(L); nse_nsock_udata *nu = check_nsock_udata(L, 1, true); NSOCK_UDATA_ENSURE_OPEN(L, nu); nu->nseid = nsock_pcap_read_packet(nsp, nu->nsiod, pcap_receive_handler, nu->timeout, nu); return yield(L, nu, "PCAP RECEIVE", FROM, 0, NULL); } LUALIB_API int luaopen_nsock (lua_State *L) { static const luaL_Reg metatable_index[] = { {"bind", l_bind}, {"close", l_close}, {"connect", l_connect}, {"get_info", l_get_info}, {"get_ssl_certificate", l_get_ssl_certificate}, {"pcap_open", l_pcap_open}, {"pcap_close", l_close}, {"pcap_receive", l_pcap_receive}, {"send", l_send}, {"sendto", l_sendto}, {"receive", l_receive}, {"receive_buf", l_receive_buf}, {"receive_bytes", l_receive_bytes}, {"receive_lines", l_receive_lines}, {"reconnect_ssl", l_reconnect_ssl}, {"set_timeout", l_set_timeout}, {NULL, NULL} }; static const luaL_Reg l_nsock[] = { {"loop", l_loop}, {"new", l_new}, {"sleep", l_sleep}, {NULL, NULL} }; /* Set up an environment for all nsock C functions to share. * This table particularly contains the THREAD_SOCKETS and * CONNECT_WAITING tables. * These values are accessed at the Lua pseudo-index LUA_ENVIRONINDEX. */ int i; int top = lua_gettop(L); /* library upvalues */ nsock_pool nsp = new_pool(L); /* NSOCK_POOL */ lua_newtable(L); /* NSOCK_SOCKET */ lua_newtable(L); /* PCAP_SOCKET */ nseU_weaktable(L, 0, MAX_PARALLELISM, "k"); /* THREAD_SOCKETS */ nseU_weaktable(L, 0, 1000, "k"); /* CONNECT_WAITING */ nseU_weaktable(L, 0, 0, "v"); /* KEY_PCAP */ /* Create the nsock metatable for sockets */ lua_pushvalue(L, top+2); /* NSOCK_SOCKET */ luaL_newlibtable(L, metatable_index); for (i = top+1; i < top+1+6; i++) lua_pushvalue(L, i); luaL_setfuncs(L, metatable_index, 6); lua_setfield(L, -2, "__index"); for (i = top+1; i < top+1+6; i++) lua_pushvalue(L, i); lua_pushcclosure(L, nsock_gc, 6); lua_setfield(L, -2, "__gc"); lua_newtable(L); lua_setfield(L, -2, "__metatable"); /* protect metatable */ lua_pop(L, 1); /* NSOCK_SOCKET */ /* Create the nsock pcap metatable */ lua_pushvalue(L, top+3); /* PCAP_SOCKET */ for (i = top+1; i < top+1+6; i++) lua_pushvalue(L, i); lua_pushcclosure(L, pcap_gc, 6); lua_setfield(L, top+3, "__gc"); lua_pop(L, 1); /* PCAP_SOCKET */ #if HAVE_OPENSSL /* Set up the SSL certificate userdata code in nse_ssl_cert.cc. */ nse_nsock_init_ssl_cert(L); #endif #if HAVE_OPENSSL /* Value speed over security in SSL connections. */ nsp_ssl_init_max_speed(nsp); #endif luaL_newlibtable(L, l_nsock); for (i = top+1; i < top+1+6; i++) lua_pushvalue(L, i); luaL_setfuncs(L, l_nsock, 6); return 1; }