/* Remember that pcap descriptor is in nonblocking state. */ int do_actual_pcap_read(struct nevent *nse) { mspcap *mp = (mspcap *)nse->iod->pcap; nsock_pcap npp; nsock_pcap *n; struct pcap_pkthdr *pkt_header; const unsigned char *pkt_data = NULL; int rc; memset(&npp, 0, sizeof(nsock_pcap)); nsock_log_debug_all(nse->iod->nsp, "PCAP %s TEST (IOD #%li) (EID #%li)", __func__, nse->iod->id, nse->id); assert(fs_length(&(nse->iobuf)) == 0); rc = pcap_next_ex(mp->pt, &pkt_header, &pkt_data); switch (rc) { case 1: /* read good packet */ #ifdef PCAP_RECV_TIMEVAL_VALID npp.ts = pkt_header->ts; #else /* On these platforms time received from pcap is invalid. * It's better to set current time */ memcpy(&npp.ts, nsock_gettimeofday(), sizeof(struct timeval)); #endif npp.len = pkt_header->len; npp.caplen = pkt_header->caplen; npp.packet = pkt_data; fs_cat(&(nse->iobuf), (char *)&npp, sizeof(npp)); fs_cat(&(nse->iobuf), (char *)pkt_data, npp.caplen); n = (nsock_pcap *)fs_str(&(nse->iobuf)); n->packet = (unsigned char *)fs_str(&(nse->iobuf)) + sizeof(npp); nsock_log_debug_all(nse->iod->nsp, "PCAP %s READ (IOD #%li) (EID #%li) size=%i", __func__, nse->iod->id, nse->id, pkt_header->caplen); rc = 1; break; case 0: /* timeout */ rc = 0; break; case -1: /* error */ fatal("pcap_next_ex() fatal error while reading from pcap: %s\n", pcap_geterr(mp->pt)); break; case -2: /* no more packets in savefile (if reading from one) */ default: fatal("Unexpected return code from pcap_next_ex! (%d)\n", rc); } return rc; }
/* Remember that pcap descriptor is in nonblocking state. */ int do_actual_pcap_read(msevent *nse) { mspcap *mp = (mspcap *)nse->iod->pcap; nsock_pcap npp; nsock_pcap *n; struct pcap_pkthdr *pkt_header; const unsigned char *pkt_data = NULL; int rc; memset(&npp, 0, sizeof(nsock_pcap)); if (nse->iod->nsp->tracelevel > 2) nsock_trace(nse->iod->nsp, "PCAP do_actual_pcap_read TEST (IOD #%li) (EID #%li)", nse->iod->id, nse->id); assert( FILESPACE_LENGTH(&(nse->iobuf)) == 0 ); rc = pcap_next_ex(mp->pt, &pkt_header, &pkt_data); switch(rc) { case 1: /* read good packet */ #ifdef PCAP_RECV_TIMEVAL_VALID npp.ts = pkt_header->ts; #else /* on these platforms time received from pcap is invalid. It's better to set current time */ memcpy(&npp.ts, nsock_gettimeofday(), sizeof(struct timeval)); #endif npp.len = pkt_header->len; npp.caplen = pkt_header->caplen; npp.packet = pkt_data; fscat(&(nse->iobuf), (char *)&npp, sizeof(npp)); fscat(&(nse->iobuf), (char *)pkt_data, npp.caplen); n = (nsock_pcap *)FILESPACE_STR(&(nse->iobuf)); n->packet = (unsigned char *)FILESPACE_STR(&(nse->iobuf)) + sizeof(npp); if (nse->iod->nsp->tracelevel > 2) nsock_trace(nse->iod->nsp, "PCAP do_actual_pcap_read READ (IOD #%li) (EID #%li) size=%i", nse->iod->id, nse->id, pkt_header->caplen); return(1); case 0: /* timeout */ return(0); case -1: /* error */ fatal("pcap_next_ex() fatal error while reading from pcap: %s\n", pcap_geterr(mp->pt)); break; case -2: /* no more packets in savefile (if reading from one) */ default: assert(0); } return 0; }
int ncat_connect(void) { nsock_pool mypool; int rc; /* Unless explicitely asked not to do so, ncat uses the * fallback nsock engine to maximize compatibility between * operating systems and the different use cases. */ if (!o.nsock_engine) nsock_set_default_engine("select"); /* Create an nsock pool */ if ((mypool = nsp_new(NULL)) == NULL) bye("Failed to create nsock_pool."); if (o.debug > 1) /* A trace level of 1 still gives you an awful lot. */ nsp_settrace(mypool, stderr, 1, nsock_gettimeofday()); /* Allow connections to broadcast addresses. */ nsp_setbroadcast(mypool, 1); #ifdef HAVE_OPENSSL set_ssl_ctx_options((SSL_CTX *) nsp_ssl_init(mypool)); #endif if (httpconnect.storage.ss_family == AF_UNSPEC && socksconnect.storage.ss_family == AF_UNSPEC) { /* A non-proxy connection. Create an iod for a new socket. */ cs.sock_nsi = nsi_new(mypool, NULL); if (cs.sock_nsi == NULL) bye("Failed to create nsock_iod."); if (nsi_set_hostname(cs.sock_nsi, o.target) == -1) bye("Failed to set hostname on iod."); #if HAVE_SYS_UN_H /* For DGRAM UNIX socket we have to use source socket */ if (o.af == AF_UNIX && o.udp) { if (srcaddr.storage.ss_family != AF_UNIX) { char *tmp_name = NULL; /* If no source socket was specified, we have to create temporary one. */ if ((tmp_name = tempnam(NULL, "ncat.")) == NULL) bye("Failed to create name for temporary DGRAM source Unix domain socket (tempnam)."); srcaddr.un.sun_family = AF_UNIX; strncpy(srcaddr.un.sun_path, tmp_name, sizeof(srcaddr.un.sun_path)); free (tmp_name); } nsi_set_localaddr(cs.sock_nsi, &srcaddr.storage, SUN_LEN((struct sockaddr_un *)&srcaddr.storage)); if (o.verbose) loguser("[%s] used as source DGRAM Unix domain socket.\n", srcaddr.un.sun_path); } else #endif if (srcaddr.storage.ss_family != AF_UNSPEC) nsi_set_localaddr(cs.sock_nsi, &srcaddr.storage, sizeof(srcaddr.storage)); if (o.numsrcrtes) { unsigned char *ipopts = NULL; size_t ipoptslen = 0; if (o.af != AF_INET) bye("Sorry, -g can only currently be used with IPv4."); ipopts = buildsrcrte(targetss.in.sin_addr, o.srcrtes, o.numsrcrtes, o.srcrteptr, &ipoptslen); nsi_set_ipoptions(cs.sock_nsi, ipopts, ipoptslen); free(ipopts); /* Nsock has its own copy */ } #if HAVE_SYS_UN_H if (o.af == AF_UNIX) { if (o.udp) { nsock_connect_unixsock_datagram(mypool, cs.sock_nsi, connect_handler, NULL, &targetss.sockaddr, SUN_LEN((struct sockaddr_un *)&targetss.sockaddr)); } else { nsock_connect_unixsock_stream(mypool, cs.sock_nsi, connect_handler, o.conntimeout, NULL, &targetss.sockaddr, SUN_LEN((struct sockaddr_un *)&targetss.sockaddr)); } } else #endif if (o.udp) { nsock_connect_udp(mypool, cs.sock_nsi, connect_handler, NULL, &targetss.sockaddr, targetsslen, inet_port(&targetss)); } #ifdef HAVE_OPENSSL else if (o.sctp && o.ssl) { nsock_connect_ssl(mypool, cs.sock_nsi, connect_handler, o.conntimeout, NULL, &targetss.sockaddr, targetsslen, IPPROTO_SCTP, inet_port(&targetss), NULL); } #endif else if (o.sctp) { nsock_connect_sctp(mypool, cs.sock_nsi, connect_handler, o.conntimeout, NULL, &targetss.sockaddr, targetsslen, inet_port(&targetss)); } #ifdef HAVE_OPENSSL else if (o.ssl) { nsock_connect_ssl(mypool, cs.sock_nsi, connect_handler, o.conntimeout, NULL, &targetss.sockaddr, targetsslen, IPPROTO_TCP, inet_port(&targetss), NULL); } #endif else { nsock_connect_tcp(mypool, cs.sock_nsi, connect_handler, o.conntimeout, NULL, &targetss.sockaddr, targetsslen, inet_port(&targetss)); } } else { /* A proxy connection. */ static int connect_socket; int len; char *line; size_t n; if (httpconnect.storage.ss_family != AF_UNSPEC) { connect_socket = do_proxy_http(); if (connect_socket == -1) return 1; } else if (socksconnect.storage.ss_family != AF_UNSPEC) { struct socket_buffer stateful_buf; struct socks4_data socks4msg; char socksbuf[8]; connect_socket = do_connect(SOCK_STREAM); if (connect_socket == -1) { loguser("Proxy connection failed: %s.\n", socket_strerror(socket_errno())); return 1; } socket_buffer_init(&stateful_buf, connect_socket); if (o.verbose) { loguser("Connected to proxy %s:%hu\n", inet_socktop(&targetss), inet_port(&targetss)); } /* Fill the socks4_data struct */ zmem(&socks4msg, sizeof(socks4msg)); socks4msg.version = SOCKS4_VERSION; socks4msg.type = SOCKS_CONNECT; socks4msg.port = socksconnect.in.sin_port; socks4msg.address = socksconnect.in.sin_addr.s_addr; if (o.proxy_auth) Strncpy(socks4msg.username, (char *) o.proxy_auth, sizeof(socks4msg.username)); len = 8 + strlen(socks4msg.username) + 1; if (send(connect_socket, (char *) &socks4msg, len, 0) < 0) { loguser("Error sending proxy request: %s.\n", socket_strerror(socket_errno())); return 1; } /* The size of the socks4 response is 8 bytes. So read exactly 8 bytes from the buffer */ if (socket_buffer_readcount(&stateful_buf, socksbuf, 8) < 0) { loguser("Error: short reponse from proxy.\n"); return 1; } if (socksbuf[1] != 90) { loguser("Proxy connection failed.\n"); return 1; } /* Clear out whatever is left in the socket buffer which may be already sent by proxy server along with http response headers. */ line = socket_buffer_remainder(&stateful_buf, &n); /* Write the leftover data to stdout. */ Write(STDOUT_FILENO, line, n); } /* Once the proxy negotiation is done, Nsock takes control of the socket. */ cs.sock_nsi = nsi_new2(mypool, connect_socket, NULL); /* Create IOD for nsp->stdin */ if ((cs.stdin_nsi = nsi_new2(mypool, 0, NULL)) == NULL) bye("Failed to create stdin nsiod."); post_connect(mypool, cs.sock_nsi); } /* connect */ rc = nsock_loop(mypool, -1); if (o.verbose) { struct timeval end_time; double time; gettimeofday(&end_time, NULL); time = TIMEVAL_MSEC_SUBTRACT(end_time, start_time) / 1000.0; loguser("%lu bytes sent, %lu bytes received in %.2f seconds.\n", nsi_get_write_count(cs.sock_nsi), nsi_get_read_count(cs.sock_nsi), time); } #if HAVE_SYS_UN_H if (o.af == AF_UNIX && o.udp) { if (o.verbose) loguser("Deleting source DGRAM Unix domain socket. [%s]\n", srcaddr.un.sun_path); unlink(srcaddr.un.sun_path); } #endif nsp_delete(mypool); return rc == NSOCK_LOOP_ERROR ? 1 : 0; }