/* 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;
}
