Vendor import of netcat as of OPENBSD_5_1.
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Xin LI
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48
nc.1
48
nc.1
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@ -1,4 +1,4 @@
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.\" $OpenBSD: nc.1,v 1.57 2011/01/09 22:16:46 jeremy Exp $
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.\" $OpenBSD: nc.1,v 1.60 2012/02/07 12:11:43 lum Exp $
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.\"
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.\" Copyright (c) 1996 David Sacerdote
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.\" All rights reserved.
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@ -25,7 +25,7 @@
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd $Mdocdate: January 8 2011 $
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.Dd $Mdocdate: October 4 2011 $
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.Dt NC 1
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.Os
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.Sh NAME
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@ -41,7 +41,7 @@
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.Op Fl P Ar proxy_username
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.Op Fl p Ar source_port
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.Op Fl s Ar source
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.Op Fl T Ar ToS
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.Op Fl T Ar toskeyword
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.Op Fl V Ar rtable
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.Op Fl w Ar timeout
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.Op Fl X Ar proxy_protocol
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@ -164,14 +164,21 @@ to create and use so that datagrams can be received.
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It is an error to use this option in conjunction with the
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.Fl l
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option.
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.It Fl T Ar ToS
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Specifies IP Type of Service (ToS) for the connection.
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Valid values are the tokens
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.Dq lowdelay ,
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.Dq throughput ,
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.Dq reliability ,
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or an 8-bit hexadecimal value preceded by
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.Dq 0x .
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.It Fl T Ar toskeyword
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Change IPv4 TOS value.
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.Ar toskeyword
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may be one of
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.Ar critical ,
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.Ar inetcontrol ,
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.Ar lowdelay ,
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.Ar netcontrol ,
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.Ar throughput ,
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.Ar reliability ,
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or one of the DiffServ Code Points:
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.Ar ef ,
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.Ar af11 ... af43 ,
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.Ar cs0 ... cs7 ;
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or a number in either hex or decimal.
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.It Fl t
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Causes
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.Nm
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@ -203,9 +210,9 @@ Have
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.Nm
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give more verbose output.
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.It Fl w Ar timeout
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If a connection and stdin are idle for more than
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Connections which cannot be established or are idle timeout after
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.Ar timeout
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seconds, then the connection is silently closed.
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seconds.
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The
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.Fl w
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flag has no effect on the
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@ -442,8 +449,15 @@ Original implementation by *Hobbit*
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Rewritten with IPv6 support by
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.An Eric Jackson Aq ericj@monkey.org .
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.Sh CAVEATS
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UDP port scans will always succeed
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(i.e. report the port as open),
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rendering the
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UDP port scans using the
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.Fl uz
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combination of flags relatively useless.
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combination of flags will always report success irrespective of
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the target machine's state.
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However,
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in conjunction with a traffic sniffer either on the target machine
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or an intermediary device,
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the
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.Fl uz
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combination could be useful for communications diagnostics.
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Note that the amount of UDP traffic generated may be limited either
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due to hardware resources and/or configuration settings.
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120
netcat.c
120
netcat.c
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@ -1,4 +1,4 @@
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/* $OpenBSD: netcat.c,v 1.101 2011/06/21 17:31:07 mikeb Exp $ */
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/* $OpenBSD: netcat.c,v 1.105 2012/02/09 06:25:35 lum Exp $ */
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/*
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* Copyright (c) 2001 Eric Jackson <ericj@monkey.org>
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*
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@ -98,6 +98,7 @@ void help(void);
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int local_listen(char *, char *, struct addrinfo);
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void readwrite(int);
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int remote_connect(const char *, const char *, struct addrinfo);
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int timeout_connect(int, const struct sockaddr *, socklen_t);
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int socks_connect(const char *, const char *, struct addrinfo,
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const char *, const char *, struct addrinfo, int, const char *);
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int udptest(int);
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@ -105,7 +106,7 @@ int unix_bind(char *);
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int unix_connect(char *);
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int unix_listen(char *);
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void set_common_sockopts(int);
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int parse_iptos(char *);
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int map_tos(char *, int *);
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void usage(int);
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int
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@ -234,7 +235,18 @@ main(int argc, char *argv[])
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Sflag = 1;
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break;
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case 'T':
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Tflag = parse_iptos(optarg);
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errstr = NULL;
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errno = 0;
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if (map_tos(optarg, &Tflag))
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break;
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if (strlen(optarg) > 1 && optarg[0] == '0' &&
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optarg[1] == 'x')
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Tflag = (int)strtol(optarg, NULL, 16);
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else
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Tflag = (int)strtonum(optarg, 0, 255,
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&errstr);
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if (Tflag < 0 || Tflag > 255 || errstr || errno)
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errx(1, "illegal tos value %s", optarg);
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break;
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default:
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usage(1);
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@ -579,7 +591,7 @@ remote_connect(const char *host, const char *port, struct addrinfo hints)
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set_common_sockopts(s);
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if (connect(s, res0->ai_addr, res0->ai_addrlen) == 0)
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if (timeout_connect(s, res0->ai_addr, res0->ai_addrlen) == 0)
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break;
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else if (vflag)
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warn("connect to %s port %s (%s) failed", host, port,
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@ -594,6 +606,43 @@ remote_connect(const char *host, const char *port, struct addrinfo hints)
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return (s);
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}
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int
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timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
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{
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struct pollfd pfd;
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socklen_t optlen;
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int flags, optval;
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int ret;
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if (timeout != -1) {
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flags = fcntl(s, F_GETFL, 0);
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if (fcntl(s, F_SETFL, flags | O_NONBLOCK) == -1)
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err(1, "set non-blocking mode");
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}
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if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) {
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pfd.fd = s;
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pfd.events = POLLOUT;
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if ((ret = poll(&pfd, 1, timeout)) == 1) {
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optlen = sizeof(optval);
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if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR,
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&optval, &optlen)) == 0) {
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errno = optval;
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ret = optval == 0 ? 0 : -1;
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}
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} else if (ret == 0) {
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errno = ETIMEDOUT;
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ret = -1;
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} else
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err(1, "poll failed");
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}
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if (timeout != -1 && fcntl(s, F_SETFL, flags) == -1)
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err(1, "restoring flags");
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return (ret);
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}
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/*
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* local_listen()
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* Returns a socket listening on a local port, binds to specified source
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@ -753,7 +802,7 @@ atelnet(int nfd, unsigned char *buf, unsigned int size)
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/*
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* build_ports()
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* Build an array or ports in portlist[], listing each port
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* Build an array of ports in portlist[], listing each port
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* that we should try to connect to.
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*/
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void
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@ -765,9 +814,6 @@ build_ports(char *p)
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int x = 0;
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if ((n = strchr(p, '-')) != NULL) {
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if (lflag)
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errx(1, "Cannot use -l with multiple ports!");
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*n = '\0';
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n++;
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@ -819,8 +865,7 @@ build_ports(char *p)
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/*
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* udptest()
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* Do a few writes to see if the UDP port is there.
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* XXX - Better way of doing this? Doesn't work for IPv6.
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* Also fails after around 100 ports checked.
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* Fails once PF state table is full.
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*/
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int
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udptest(int s)
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@ -874,20 +919,51 @@ set_common_sockopts(int s)
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}
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int
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parse_iptos(char *s)
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map_tos(char *s, int *val)
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{
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int tos = -1;
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/* DiffServ Codepoints and other TOS mappings */
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const struct toskeywords {
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const char *keyword;
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int val;
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} *t, toskeywords[] = {
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{ "af11", IPTOS_DSCP_AF11 },
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{ "af12", IPTOS_DSCP_AF12 },
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{ "af13", IPTOS_DSCP_AF13 },
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{ "af21", IPTOS_DSCP_AF21 },
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{ "af22", IPTOS_DSCP_AF22 },
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{ "af23", IPTOS_DSCP_AF23 },
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{ "af31", IPTOS_DSCP_AF31 },
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{ "af32", IPTOS_DSCP_AF32 },
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{ "af33", IPTOS_DSCP_AF33 },
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{ "af41", IPTOS_DSCP_AF41 },
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{ "af42", IPTOS_DSCP_AF42 },
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{ "af43", IPTOS_DSCP_AF43 },
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{ "critical", IPTOS_PREC_CRITIC_ECP },
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{ "cs0", IPTOS_DSCP_CS0 },
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{ "cs1", IPTOS_DSCP_CS1 },
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{ "cs2", IPTOS_DSCP_CS2 },
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{ "cs3", IPTOS_DSCP_CS3 },
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{ "cs4", IPTOS_DSCP_CS4 },
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{ "cs5", IPTOS_DSCP_CS5 },
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{ "cs6", IPTOS_DSCP_CS6 },
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{ "cs7", IPTOS_DSCP_CS7 },
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{ "ef", IPTOS_DSCP_EF },
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{ "inetcontrol", IPTOS_PREC_INTERNETCONTROL },
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{ "lowdelay", IPTOS_LOWDELAY },
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{ "netcontrol", IPTOS_PREC_NETCONTROL },
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{ "reliability", IPTOS_RELIABILITY },
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{ "throughput", IPTOS_THROUGHPUT },
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{ NULL, -1 },
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};
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if (strcmp(s, "lowdelay") == 0)
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return (IPTOS_LOWDELAY);
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if (strcmp(s, "throughput") == 0)
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return (IPTOS_THROUGHPUT);
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if (strcmp(s, "reliability") == 0)
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return (IPTOS_RELIABILITY);
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for (t = toskeywords; t->keyword != NULL; t++) {
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if (strcmp(s, t->keyword) == 0) {
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*val = t->val;
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return (1);
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}
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}
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if (sscanf(s, "0x%x", &tos) != 1 || tos < 0 || tos > 0xff)
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errx(1, "invalid IP Type of Service");
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return (tos);
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return (0);
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}
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void
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@ -911,7 +987,7 @@ help(void)
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\t-r Randomize remote ports\n\
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\t-S Enable the TCP MD5 signature option\n\
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\t-s addr\t Local source address\n\
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\t-T ToS\t Set IP Type of Service\n\
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\t-T toskeyword\tSet IP Type of Service\n\
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\t-t Answer TELNET negotiation\n\
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\t-U Use UNIX domain socket\n\
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\t-u UDP mode\n\
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