Finish the import of nc(1) from OpenBSD. This includes:
- Bring IPsec support from the ports collection [1].
- Bring -o ("once only") option from the ports
collection [2].
- Adopt the Makefile framework into
usr.bin/nc/Makefile.
- Add a knob to control whether to build nc(1),
NO_NETCAT.
- Bump __FreeBSD_version so ports collection can
detect this change.
Original patchset are contributed to the ports collection by:
[1] nectar, [2] joerg.
Note: WARNS?=6 patchset spined off in this commit, in order not
to take too many files off the vendor branch.
This commit is contained in:
Xin LI
parent
c41ba5f041
commit
04def62430
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=141394
@ -1,5 +1,3 @@
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.\" $OpenBSD: nc.1,v 1.36 2005/01/07 10:11:31 jmc 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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.\"
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@ -25,7 +23,10 @@
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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 June 25, 2001
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.\" $OpenBSD: nc.1,v 1.36 2005/01/07 10:11:31 jmc Exp $
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.\" $FreeBSD$
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.\"
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.Dd January 30, 2005
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.Dt NC 1
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.Os
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.Sh NAME
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@ -34,7 +35,8 @@
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.Sh SYNOPSIS
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.Nm nc
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.Bk -words
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.Op Fl 46DdhklnrStUuvz
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.Op Fl 46DEdhklnorStUuvz
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.Op Fl e Ar IPsec policy
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.Op Fl i Ar interval
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.Op Fl p Ar source_port
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.Op Fl s Ar source_ip_address
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@ -99,6 +101,16 @@ Do not attempt to read from stdin.
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Prints out
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.Nm
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help.
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.It Fl E
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Shortcut for "-e 'in ipsec esp/transport//require' -e 'out ipsec
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esp/transport//require'", which enables IPsec ESP transport mode in both
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directions.
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.It Fl e
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If IPsec support is available, then one can specify the IPsec policies
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to be used using the syntax described in
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.Xr ipsec_set_policy 3 .
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This flag can be specified up to two times, as typically one policy for
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each direction is needed.
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.It Fl i Ar interval
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Specifies a delay time interval between lines of text sent and received.
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Also causes a delay time between connections to multiple ports.
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@ -127,6 +139,15 @@ option are ignored.
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.It Fl n
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Do not do any DNS or service lookups on any specified addresses,
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hostnames or ports.
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.It Fl o
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.Dq Once-only mode .
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By default,
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.Nm
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does not terminate on EOF condition on input,
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but continues until the network side has been closed down.
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Specifying
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.Fl o
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will make it terminate on EOF as well.
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.It Fl p Ar source_port
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Specifies the source port
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.Nm
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@ -362,6 +383,12 @@ Open a UDP connection to port 53 of hostname:
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.Pp
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Open a TCP connection to port 42 of example.host using 10.1.2.3 as the
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IP for the local end of the connection:
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.It Li "nc -E example.host 42"
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Open a TCP connection to port 42 of example.host using IPsec ESP for
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incoming and outgoing traffic.
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.It Li "nc -e 'out ipsec esp/transport//require' example.host 42"
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Open a TCP connection to port 42 of example.host using IPsec ESP for
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outgoing traffic only.
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.Pp
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.Dl $ nc -s 10.1.2.3 example.host 42
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.Pp
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@ -1,4 +1,3 @@
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/* $OpenBSD: netcat.c,v 1.76 2004/12/10 16:51:31 hshoexer 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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@ -24,6 +23,9 @@
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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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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* From: $OpenBSD: netcat.c,v 1.76 2004/12/10 16:51:31 hshoexer Exp $
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* $FreeBSD$
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*/
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/*
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@ -31,12 +33,16 @@
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* *Hobbit* <hobbit@avian.org>.
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*/
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#include <sys/limits.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/un.h>
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#include <netinet/in.h>
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#ifdef IPSEC
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#include <netinet6/ipsec.h>
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#endif
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#include <netinet/tcp.h>
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#include <arpa/telnet.h>
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@ -60,11 +66,13 @@
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#define PORT_MAX_LEN 6
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/* Command Line Options */
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int Eflag; /* Use IPsec ESP */
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int dflag; /* detached, no stdin */
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int iflag; /* Interval Flag */
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int kflag; /* More than one connect */
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int lflag; /* Bind to local port */
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int nflag; /* Don't do name look up */
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int oflag; /* Once only: stop on EOF */
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char *pflag; /* Localport flag */
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int rflag; /* Random ports flag */
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char *sflag; /* Source Address */
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@ -94,10 +102,16 @@ int unix_connect(char *);
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int unix_listen(char *);
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void usage(int);
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#ifdef IPSEC
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void add_ipsec_policy(int, char *);
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char *ipsec_policy[2];
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#endif
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int
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main(int argc, char *argv[])
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{
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int ch, s, ret, socksv;
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int ch, s, ret, socksv, ipsec_count;
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char *host, *uport, *endp;
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struct addrinfo hints;
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struct servent *sv;
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@ -108,6 +122,7 @@ main(int argc, char *argv[])
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struct addrinfo proxyhints;
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ret = 1;
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ipsec_count = 0;
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s = 0;
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socksv = 5;
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host = NULL;
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@ -115,7 +130,7 @@ main(int argc, char *argv[])
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endp = NULL;
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sv = NULL;
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while ((ch = getopt(argc, argv, "46Ddhi:klnp:rSs:tUuvw:X:x:z")) != -1) {
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while ((ch = getopt(argc, argv, "46e:DEdhi:klnop:rSs:tUuvw:X:x:z")) != -1) {
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switch (ch) {
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case '4':
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family = AF_INET;
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@ -139,6 +154,21 @@ main(int argc, char *argv[])
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case 'd':
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dflag = 1;
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break;
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case 'e':
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#ifdef IPSEC
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ipsec_policy[ipsec_count++ % 2] = optarg;
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#else
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errx(1, "IPsec support unavailable.");
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#endif
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break;
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case 'E':
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#ifdef IPSEC
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ipsec_policy[0] = "in ipsec esp/transport//require";
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ipsec_policy[1] = "out ipsec esp/transport//require";
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#else
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errx(1, "IPsec support unavailable.");
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#endif
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break;
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case 'h':
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help();
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break;
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@ -156,6 +186,9 @@ main(int argc, char *argv[])
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case 'n':
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nflag = 1;
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break;
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case 'o':
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oflag = 1;
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break;
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case 'p':
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pflag = optarg;
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break;
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@ -465,6 +498,12 @@ remote_connect(char *host, char *port, struct addrinfo hints)
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if ((s = socket(res0->ai_family, res0->ai_socktype,
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res0->ai_protocol)) < 0)
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continue;
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#ifdef IPSEC
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if (ipsec_policy[0] != NULL)
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add_ipsec_policy(s, ipsec_policy[0]);
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if (ipsec_policy[1] != NULL)
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add_ipsec_policy(s, ipsec_policy[1]);
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#endif
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/* Bind to a local port or source address if specified. */
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if (sflag || pflag) {
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@ -550,6 +589,12 @@ local_listen(char *host, char *port, struct addrinfo hints)
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ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
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if (ret == -1)
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err(1, NULL);
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#ifdef IPSEC
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if (ipsec_policy[0] != NULL)
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add_ipsec_policy(s, ipsec_policy[0]);
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if (ipsec_policy[1] != NULL)
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add_ipsec_policy(s, ipsec_policy[1]);
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#endif
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if (Sflag) {
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ret = setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
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&x, sizeof(x));
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@ -629,9 +674,10 @@ readwrite(int nfd)
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}
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if (!dflag && pfd[1].revents & POLLIN) {
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if ((n = read(wfd, buf, sizeof(buf))) < 0)
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if ((n = read(wfd, buf, sizeof(buf))) < 0 ||
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(oflag && n == 0)) {
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return;
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else if (n == 0) {
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} else if (n == 0) {
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shutdown(nfd, SHUT_WR);
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pfd[1].fd = -1;
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pfd[1].events = 0;
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@ -767,7 +813,13 @@ help(void)
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usage(0);
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fprintf(stderr, "\tCommand Summary:\n\
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\t-4 Use IPv4\n\
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\t-6 Use IPv6\n\
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\t-6 Use IPv6\n");
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#ifdef IPSEC
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fprintf(stderr, "\
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\t-e policy Use specified IPsec policy\n\
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\t-E Use IPsec ESP\n");
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#endif
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fprintf(stderr, "\
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\t-D Enable the debug socket option\n\
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\t-d Detach from stdin\n\
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\t-h This help text\n\
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@ -788,13 +840,43 @@ help(void)
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\t-x addr[:port]\tSpecify proxy address and port\n\
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\t-z Zero-I/O mode [used for scanning]\n\
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Port numbers can be individual or ranges: lo-hi [inclusive]\n");
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#ifdef IPSEC
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fprintf(stderr, "See ipsec_set_policy(3) for -e argument format\n");
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#endif
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exit(1);
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}
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#ifdef IPSEC
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void
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add_ipsec_policy(int s, char *policy)
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{
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char *raw;
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int e;
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raw = ipsec_set_policy(policy, strlen(policy));
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if (raw == NULL)
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errx(1, "ipsec_set_policy `%s': %s", policy,
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ipsec_strerror());
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e = setsockopt(s, IPPROTO_IP, IP_IPSEC_POLICY, raw,
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ipsec_get_policylen(raw));
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if (e < 0)
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err(1, "ipsec policy cannot be configured");
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free(raw);
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if (vflag)
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fprintf(stderr, "ipsec policy configured: `%s'\n", policy);
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return;
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}
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#endif /* IPSEC */
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void
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usage(int ret)
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{
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#ifdef IPSEC
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fprintf(stderr, "usage: nc [-46DEdhklnrStUuvz] [-e policy] [-i interval] [-p source_port]\n");
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#else
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fprintf(stderr, "usage: nc [-46DdhklnrStUuvz] [-i interval] [-p source_port]\n");
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#endif
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fprintf(stderr, "\t [-s source_ip_address] [-w timeout] [-X proxy_version]\n");
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fprintf(stderr, "\t [-x proxy_address[:port]] [hostname] [port[s]]\n");
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if (ret)
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@ -57,7 +57,7 @@
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* is created, otherwise 1.
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*/
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#undef __FreeBSD_version
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#define __FreeBSD_version 600009 /* Master, propagated to newvers */
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#define __FreeBSD_version 600010 /* Master, propagated to newvers */
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#ifndef LOCORE
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#include <sys/types.h>
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11
usr.bin/nc/Makefile
Normal file
11
usr.bin/nc/Makefile
Normal file
@ -0,0 +1,11 @@
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# $FreeBSD$
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.PATH: ${.CURDIR}/../../contrib/netcat
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PROG= nc
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SRCS= netcat.c atomicio.c socks.c
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CFLAGS+=-DIPSEC
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LDADD+= -lipsec
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.include <bsd.prog.mk>
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