Sync from SUSE:SLFO:Main netcat-openbsd revision ef3e0d7f9a6add739cd4d72bc4e3ad20

abstract-unix-domain-socket.patch

@@ -0,0 +1,157 @@
+From: Dirk Jagdmann <doj@cubic.org>
+Date: Sun, 6 Mar 2022 21:26:31 -0800
+Subject: Add abstract UNIX domain socket support
+
+When using '-U' to connect() or bind() to a UNIX domain socket, if the
+address (path) starts with "@", it is read as an abstract namespace
+socket (the leading "@" is replaced with a NUL byte before binding).
+
+This feature is Linux-only.
+
+Forwarded: not-needed
+---
+ nc.1     |  3 +++
+ netcat.c | 75 ++++++++++++++++++++++++++++++++++++++++++++--------------------
+ 2 files changed, 55 insertions(+), 23 deletions(-)
+
+diff --git a/nc.1 b/nc.1
+index d30389a..8285c10 100644
+--- a/nc.1
++++ b/nc.1
+@@ -235,6 +235,9 @@ Cannot be used together with
+ .Fl F
+ or
+ .Fl x .
++On Linux, if the name starts with an at symbol (`@') it is read as an abstract
++namespace socket: the leading `@' is replaced with a \fBNUL\fR byte
++before binding or connecting.  For details, see \fBunix\fR(7).
+ .It Fl u
+ Use UDP instead of TCP.
+ Cannot be used together with
+diff --git a/netcat.c b/netcat.c
+index 061a774..2f8890b 100644
+--- a/netcat.c
++++ b/netcat.c
+@@ -98,6 +98,7 @@
+ #include <netdb.h>
+ #include <poll.h>
+ #include <signal.h>
++#include <stddef.h>
+ #include <stdarg.h>
+ #include <stdio.h>
+ #include <stdlib.h>
+@@ -208,6 +209,7 @@ int	timeout_connect(int, const struct sockaddr *, socklen_t);
+ int	socks_connect(const char *, const char *, struct addrinfo,
+ 	    const char *, const char *, struct addrinfo, int, const char *);
+ int	udptest(int);
++int	unix_setup_sockaddr(char *, struct sockaddr_un *, int *);
+ void	connection_info(const char *, const char *, const char *, const char *);
+ int	unix_bind(char *, int);
+ int	unix_connect(char *);
+@@ -931,6 +933,46 @@ main(int argc, char *argv[])
+ 	return ret;
+ }
+ 
++int
++unix_setup_sockaddr(char *path, struct sockaddr_un *s_un, int *addrlen)
++{
++	int sun_path_len;
++
++	*addrlen = offsetof(struct sockaddr_un, sun_path);
++	memset(s_un, 0, *addrlen);
++	s_un->sun_family = AF_UNIX;
++
++	if (path[0] == '\0') {
++		/* Always reject the empty path, aka NUL abstract socket on
++		 * Linux (OTOH the *empty* abstract socket is supported and
++		 * specified as @""). */
++		errno = EINVAL;
++		return -1;
++	}
++#ifdef __linux__
++	/* If the unix domain socket path starts with '@',
++	 * treat it as a Linux abstract name. */
++	else if (path[0] == '@') {
++		if ((sun_path_len = strlen(path)) <= sizeof(s_un->sun_path)) {
++			s_un->sun_path[0] = '\0';
++			strncpy(s_un->sun_path+1, path+1, sun_path_len-1);
++			*addrlen += sun_path_len;
++		} else {
++			errno = ENAMETOOLONG;
++			return -1;
++		}
++	}
++#endif
++	else if ((sun_path_len = strlcpy(s_un->sun_path, path, sizeof(s_un->sun_path))) <
++	    sizeof(s_un->sun_path))
++		*addrlen += sun_path_len + 1; /* account for trailing '\0' */
++	else {
++		errno = ENAMETOOLONG;
++		return -1;
++	}
++	return 0;
++}
++
+ /*
+  * unix_bind()
+  * Returns a unix socket bound to the given path
+@@ -939,24 +981,17 @@ int
+ unix_bind(char *path, int flags)
+ {
+ 	struct sockaddr_un s_un;
+-	int s, save_errno;
++	int s, save_errno, addrlen;
++
++	if (unix_setup_sockaddr(path, &s_un, &addrlen) == -1)
++		return -1;
+ 
+ 	/* Create unix domain socket. */
+ 	if ((s = socket(AF_UNIX, flags | (uflag ? SOCK_DGRAM : SOCK_STREAM),
+ 	    0)) == -1)
+ 		return -1;
+ 
+-	memset(&s_un, 0, sizeof(struct sockaddr_un));
+-	s_un.sun_family = AF_UNIX;
+-
+-	if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
+-	    sizeof(s_un.sun_path)) {
+-		close(s);
+-		errno = ENAMETOOLONG;
+-		return -1;
+-	}
+-
+-	if (bind(s, (struct sockaddr *)&s_un, sizeof(s_un)) == -1) {
++	if (bind(s, (struct sockaddr *)&s_un, addrlen) == -1) {
+ 		save_errno = errno;
+ 		close(s);
+ 		errno = save_errno;
+@@ -1066,7 +1101,10 @@ int
+ unix_connect(char *path)
+ {
+ 	struct sockaddr_un s_un;
+-	int s, save_errno;
++	int s, save_errno, addrlen;
++
++	if (unix_setup_sockaddr(path, &s_un, &addrlen) == -1)
++		return -1;
+ 
+ 	if (uflag) {
+ 		if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) == -1)
+@@ -1076,16 +1114,7 @@ unix_connect(char *path)
+ 			return -1;
+ 	}
+ 
+-	memset(&s_un, 0, sizeof(struct sockaddr_un));
+-	s_un.sun_family = AF_UNIX;
+-
+-	if (strlcpy(s_un.sun_path, path, sizeof(s_un.sun_path)) >=
+-	    sizeof(s_un.sun_path)) {
+-		close(s);
+-		errno = ENAMETOOLONG;
+-		return -1;
+-	}
+-	if (connect(s, (struct sockaddr *)&s_un, sizeof(s_un)) == -1) {
++	if (connect(s, (struct sockaddr *)&s_un, addrlen) == -1) {
+ 		save_errno = errno;
+ 		close(s);
+ 		errno = save_errno;

broadcast-support.patch

@@ -1,12 +1,14 @@
 From: Aron Xu <aron@debian.org>
 Date: Mon, 13 Feb 2012 19:06:52 +0800
-Subject: broadcast support
+Subject: New flag '-b' for broadcast support
 
 ---
  nc.1     |  4 +++-
  netcat.c | 22 ++++++++++++++++++++--
  2 files changed, 23 insertions(+), 3 deletions(-)
 
+diff --git a/nc.1 b/nc.1
+index da37f06..49a3d4d 100644
 --- a/nc.1
 +++ b/nc.1
 @@ -33,7 +33,7 @@
@@ -27,6 +29,8 @@ Subject: broadcast support
  .It Fl C
  Send CRLF as line-ending.  Each line feed (LF) character from the input
  data is translated into CR+LF before being written to the socket.  Line
+diff --git a/netcat.c b/netcat.c
+index 1c50615..99747a2 100644
 --- a/netcat.c
 +++ b/netcat.c
 @@ -132,6 +132,7 @@
@@ -37,37 +41,37 @@ Subject: broadcast support
  int	dflag;					/* detached, no stdin */
  int	Fflag;					/* fdpass sock to stdout */
  unsigned int iflag;				/* Interval Flag */
-@@ -263,9 +264,9 @@ main(int argc, char *argv[])
+@@ -261,9 +262,9 @@ main(int argc, char *argv[])
  
  	while ((ch = getopt(argc, argv,
- # if defined(TLS)
+ #ifdef HAVE_TLS
 -	    "46C:cDde:FH:hI:i:K:klM:m:NnO:o:P:p:q:R:rSs:T:tUuV:vW:w:X:x:Z:z"))
 +	    "46bC:cDde:FH:hI:i:K:klM:m:NnO:o:P:p:q:R:rSs:T:tUuV:vW:w:X:x:Z:z"))
- # else
+ #else
 -	    "46CDdFhI:i:klM:m:NnO:P:p:q:rSs:T:tUuV:vW:w:X:x:Zz"))
 +	    "46bCDdFhI:i:klM:m:NnO:P:p:q:rSs:T:tUuV:vW:w:X:x:Zz"))
- # endif
+ #endif
  	    != -1) {
  		switch (ch) {
-@@ -275,6 +276,13 @@ main(int argc, char *argv[])
+@@ -273,6 +274,13 @@ main(int argc, char *argv[])
  		case '6':
  			family = AF_INET6;
  			break;
 +		case 'b':
-+# if defined(SO_BROADCAST)
++#ifdef SO_BROADCAST
 +			bflag = 1;
-+# else
++#else
 +			errx(1, "no broadcast frame support available");
-+# endif
++#endif
 +			break;
  		case 'U':
  			family = AF_UNIX;
  			break;
-@@ -1852,6 +1860,15 @@ set_common_sockopts(int s, int af)
+@@ -1907,6 +1915,15 @@ set_common_sockopts(int s, int af)
  {
  	int x = 1;
  
-+# if defined(SO_BROADCAST)
++#ifdef SO_BROADCAST
 +	if (bflag) {
 +		/* allow datagram sockets to send packets to a broadcast address
 +		 * (this option has no effect on stream-oriented sockets) */
@@ -75,11 +79,11 @@ Subject: broadcast support
 +			&x, sizeof(x)) == -1)
 +			err(1, NULL);
 +	}
-+# endif
- # if defined(TCP_MD5SIG)
++#endif
+ #ifdef TCP_MD5SIG
  	if (Sflag) {
  		if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
-@@ -2127,6 +2144,7 @@ help(void)
+@@ -2185,6 +2202,7 @@ help(void)
  	fprintf(stderr, "\tCommand Summary:\n\
  	\t-4		Use IPv4\n\
  	\t-6		Use IPv6\n\

build-without-TLS-support.patch

@@ -1,16 +1,19 @@
 From: Guilhem Moulin <guilhem@debian.org>
-Date: Fri, 09 Jun 2017 13:21:23 +0200
-Subject: build without TLS support
+Date: Fri, 9 Jun 2017 13:21:23 +0200
+Subject: Build without TLS support
 
-tls.h isn't available in libsd-dev, and TLS supports adds options (-C, -Z)
+tls.h isn't available in libbsd-dev, and TLS supports adds options (-C, -Z)
 that are already used by our Debian-specific patches.
 
+Forwarded: not-needed
 ---
- Makefile |    2 
- nc.1     |  114 ++---------------------------------------
+ Makefile |   2 -
+ nc.1     | 114 +++---------------------------------------
  netcat.c | 172 +++++++++++++++++++++++++++++++++++++++++++++++++++++----------
  3 files changed, 153 insertions(+), 135 deletions(-)
 
+diff --git a/Makefile b/Makefile
+index 93ca5ee..31d7536 100644
 --- a/Makefile
 +++ b/Makefile
 @@ -2,8 +2,6 @@
@@ -20,8 +23,10 @@ that are already used by our Debian-specific patches.
 -LDADD+= -ltls -lssl -lcrypto
 -DPADD+=  ${LIBTLS} ${LIBSSL} ${LIBCRYPTO}
  
- LIBS=  `pkg-config --libs libbsd` -lresolv
- OBJS=  $(SRCS:.c=.o)
+ PKG_CONFIG ?= pkg-config
+ LIBS=  `$(PKG_CONFIG) --libs libbsd` -lresolv
+diff --git a/nc.1 b/nc.1
+index 596bd8e..2eb732e 100644
 --- a/nc.1
 +++ b/nc.1
 @@ -33,20 +33,14 @@
@@ -43,7 +48,7 @@ that are already used by our Debian-specific patches.
  .Op Fl P Ar proxy_username
  .Op Fl p Ar source_port
 -.Op Fl R Ar CAfile
- .Op Fl s Ar source
+ .Op Fl s Ar sourceaddr
  .Op Fl T Ar keyword
  .Op Fl V Ar rtable
 @@ -54,7 +48,6 @@
@@ -115,8 +120,8 @@ that are already used by our Debian-specific patches.
  .It Fl k
  When a connection is completed, listen for another one.
  Requires
-@@ -196,15 +154,6 @@ Do not do any DNS or service lookups on
- hostnames or ports.
+@@ -196,15 +154,6 @@ Do not perform domain name resolution.
+ If a name cannot be resolved without DNS, an error will be reported.
  .It Fl O Ar length
  Specify the size of the TCP send buffer.
 -.It Fl o Ar staplefile
@@ -131,7 +136,7 @@ that are already used by our Debian-specific patches.
  .It Fl P Ar proxy_username
  Specifies a username to present to a proxy server that requires authentication.
  If no username is specified then authentication will not be attempted.
-@@ -213,13 +162,6 @@ Proxy authentication is only supported f
+@@ -213,13 +162,6 @@ Proxy authentication is only supported for HTTP CONNECT proxies at present.
  Specify the source port
  .Nm
  should use, subject to privilege restrictions and availability.
@@ -145,7 +150,7 @@ that are already used by our Debian-specific patches.
  .It Fl r
  Choose source and/or destination ports randomly
  instead of sequentially within a range or in the order that the system
-@@ -239,35 +181,7 @@ Cannot be used together with
+@@ -238,35 +180,7 @@ Cannot be used together with
  or
  .Fl x .
  .It Fl T Ar keyword
@@ -182,7 +187,7 @@ that are already used by our Debian-specific patches.
  .Ar keyword
  may be one of
  .Cm critical ,
-@@ -291,13 +205,13 @@ to script telnet sessions.
+@@ -290,13 +204,13 @@ to script telnet sessions.
  Use
  .Ux Ns -domain
  sockets.
@@ -200,7 +205,7 @@ that are already used by our Debian-specific patches.
  .Fl x .
  For
  .Ux Ns -domain
-@@ -360,12 +274,6 @@ An IPv6 address can be specified unambig
+@@ -359,12 +273,6 @@ An IPv6 address can be specified unambiguously by enclosing
  in square brackets.
  A proxy cannot be used with any of the options
  .Fl lsuU .
@@ -213,7 +218,7 @@ that are already used by our Debian-specific patches.
  .It Fl z
  Only scan for listening daemons, without sending any data to them.
  Cannot be used together with
-@@ -519,16 +427,6 @@ the source port, with a timeout of 5 sec
+@@ -522,16 +430,6 @@ the source port, with a timeout of 5 seconds:
  .Pp
  .Dl $ nc -p 31337 -w 5 host.example.com 42
  .Pp
@@ -230,6 +235,8 @@ that are already used by our Debian-specific patches.
  Open a UDP connection to port 53 of host.example.com:
  .Pp
  .Dl $ nc -u host.example.com 53
+diff --git a/netcat.c b/netcat.c
+index d23e566..bec6e46 100644
 --- a/netcat.c
 +++ b/netcat.c
 @@ -99,7 +99,9 @@
@@ -237,7 +244,7 @@ that are already used by our Debian-specific patches.
  #include <string.h>
  #include <time.h>
 -#include <tls.h>
-+#ifdef TLS
++#ifdef HAVE_TLS
 +# include <tls.h>
 +#endif
  #include <unistd.h>
@@ -251,7 +258,7 @@ that are already used by our Debian-specific patches.
 -#define TLS_NONAME	(1 << 2)
 -#define TLS_CCERT	(1 << 3)
 -#define TLS_MUSTSTAPLE	(1 << 4)
-+#ifdef TLS
++#ifdef HAVE_TLS
 +# define TLS_NOVERIFY	(1 << 1)
 +# define TLS_NONAME	(1 << 2)
 +# define TLS_CCERT	(1 << 3)
@@ -260,19 +267,19 @@ that are already used by our Debian-specific patches.
  
  /* Command Line Options */
  int	dflag;					/* detached, no stdin */
-@@ -144,6 +148,7 @@ int	Sflag;					/* TCP MD5 signature opti
+@@ -144,6 +148,7 @@ int	Sflag;					/* TCP MD5 signature option */
  int	Tflag = -1;				/* IP Type of Service */
  int	rtableid = -1;
  
-+# if defined(TLS)
++#ifdef HAVE_TLS
  int	usetls;					/* use TLS */
  const char    *Cflag;				/* Public cert file */
  const char    *Kflag;				/* Private key file */
-@@ -156,6 +161,7 @@ char	*tls_expecthash;			/* required hash
+@@ -156,6 +161,7 @@ char	*tls_expecthash;			/* required hash of peer cert */
  char	*tls_ciphers;				/* TLS ciphers */
  char	*tls_protocols;				/* TLS protocols */
  FILE	*Zflag;					/* file to save peer cert */
-+# endif
++#endif
  
  int recvcount, recvlimit;
  int timeout = -1;
@@ -280,71 +287,70 @@ that are already used by our Debian-specific patches.
  void	build_ports(char *);
  void	help(void) __attribute__((noreturn));
  int	local_listen(const char *, const char *, struct addrinfo);
-+# if defined(TLS)
++#ifdef HAVE_TLS
  void	readwrite(int, struct tls *);
-+# else
++#else
 +void	readwrite(int);
-+# endif
++#endif
  void	fdpass(int nfd) __attribute__((noreturn));
- int	remote_connect(const char *, const char *, struct addrinfo);
-+# if defined(TLS)
+ int	remote_connect(const char *, const char *, struct addrinfo, char *);
++#ifdef HAVE_TLS
  int	timeout_tls(int, struct tls *, int (*)(struct tls *));
-+# endif
++#endif
  int	timeout_connect(int, const struct sockaddr *, socklen_t);
  int	socks_connect(const char *, const char *, struct addrinfo,
  	    const char *, const char *, struct addrinfo, int, const char *);
-@@ -183,15 +195,24 @@ int	unix_connect(char *);
+@@ -184,15 +196,24 @@ int	unix_connect(char *);
  int	unix_listen(char *);
  void	set_common_sockopts(int, int);
  int	process_tos_opt(char *, int *);
-+# if defined(TLS)
++#ifdef HAVE_TLS
  int	process_tls_opt(char *, int *);
  void	save_peer_cert(struct tls *_tls_ctx, FILE *_fp);
-+# endif
++#endif
  void	report_sock(const char *, const struct sockaddr *, socklen_t, char *);
-+# if defined(TLS)
++#ifdef HAVE_TLS
  void	report_tls(struct tls *tls_ctx, char * host);
-+# endif
++#endif
  void	usage(int);
-+# if defined(TLS)
++#ifdef HAVE_TLS
  ssize_t drainbuf(int, unsigned char *, size_t *, struct tls *);
  ssize_t fillbuf(int, unsigned char *, size_t *, struct tls *);
  void	tls_setup_client(struct tls *, int, char *);
  struct tls *tls_setup_server(struct tls *, int, char *);
-+# else
++#else
 +ssize_t drainbuf(int, unsigned char *, size_t *);
 +ssize_t fillbuf(int, unsigned char *, size_t *);
-+# endif
++#endif
  
  int
  main(int argc, char *argv[])
-@@ -206,8 +227,10 @@ main(int argc, char *argv[])
+@@ -207,20 +228,28 @@ main(int argc, char *argv[])
  	const char *errstr;
  	struct addrinfo proxyhints;
  	char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE];
-+# if defined(TLS)
++#ifdef HAVE_TLS
  	struct tls_config *tls_cfg = NULL;
  	struct tls *tls_ctx = NULL;
-+# endif
++#endif
  	uint32_t protocols;
  
  	ret = 1;
-@@ -215,12 +238,18 @@ main(int argc, char *argv[])
+ 	socksv = 5;
  	host = NULL;
  	uport = NULL;
- 	sv = NULL;
-+# if defined(TLS)
++#ifdef HAVE_TLS
  	Rflag = tls_default_ca_cert_file();
-+# endif
++#endif
  
  	signal(SIGPIPE, SIG_IGN);
  
  	while ((ch = getopt(argc, argv,
-+# if defined(TLS)
++#ifdef HAVE_TLS
  	    "46C:cDde:FH:hI:i:K:klM:m:NnO:o:P:p:R:rSs:T:tUuV:vW:w:X:x:Z:z"))
-+# else
++#else
 +	    "46DdFhI:i:klM:m:NnO:P:p:rSs:T:tUuV:vW:w:X:x:z"))
-+# endif
++#endif
  	    != -1) {
  		switch (ch) {
  		case '4':
@@ -352,30 +358,30 @@ that are already used by our Debian-specific patches.
  			else
  				errx(1, "unsupported proxy protocol");
  			break;
-+# if defined(TLS)
++#ifdef HAVE_TLS
  		case 'C':
  			Cflag = optarg;
  			break;
  		case 'c':
  			usetls = 1;
  			break;
-+# endif
++#endif
  		case 'd':
  			dflag = 1;
  			break;
-+# if defined(TLS)
++#ifdef HAVE_TLS
  		case 'e':
  			tls_expectname = optarg;
  			break;
-+# endif
++#endif
  		case 'F':
  			Fflag = 1;
  			break;
-+# if defined(TLS)
++#ifdef HAVE_TLS
  		case 'H':
  			tls_expecthash = optarg;
  			break;
-+# endif
++#endif
  		case 'h':
  			help();
  			break;
@@ -383,11 +389,11 @@ that are already used by our Debian-specific patches.
  			if (errstr)
  				errx(1, "interval %s: %s", errstr, optarg);
  			break;
-+# if defined(TLS)
++#ifdef HAVE_TLS
  		case 'K':
  			Kflag = optarg;
  			break;
-+# endif
++#endif
  		case 'k':
  			kflag = 1;
  			break;
@@ -395,12 +401,12 @@ that are already used by our Debian-specific patches.
  		case 'p':
  			pflag = optarg;
  			break;
-+# if defined(TLS)
++#ifdef HAVE_TLS
  		case 'R':
  			tls_cachanged = 1;
  			Rflag = optarg;
  			break;
-+# endif
++#endif
  		case 'r':
  			rflag = 1;
  			break;
@@ -408,14 +414,14 @@ that are already used by our Debian-specific patches.
  			if ((proxy = strdup(optarg)) == NULL)
  				err(1, NULL);
  			break;
-+# if defined(TLS)
++#ifdef HAVE_TLS
  		case 'Z':
  			if (strcmp(optarg, "-") == 0)
  				Zflag = stderr;
  			else if ((Zflag = fopen(optarg, "w")) == NULL)
  				err(1, "can't open %s", optarg);
  			break;
-+# endif
++#endif
  		case 'z':
  			zflag = 1;
  			break;
@@ -423,22 +429,22 @@ that are already used by our Debian-specific patches.
  				errx(1, "TCP send window %s: %s",
  				    errstr, optarg);
  			break;
-+# if defined(TLS)
++#ifdef HAVE_TLS
  		case 'o':
  			oflag = optarg;
  			break;
-+# endif
++#endif
  		case 'S':
- # if defined(TCP_MD5SIG)
+ #ifdef TCP_MD5SIG
  			Sflag = 1;
 @@ -381,8 +424,10 @@ main(int argc, char *argv[])
  		case 'T':
  			errstr = NULL;
  			errno = 0;
-+# if defined(TLS)
++#ifdef HAVE_TLS
  			if (process_tls_opt(optarg, &TLSopt))
  				break;
-+# endif
++#endif
  			if (process_tos_opt(optarg, &Tflag))
  				break;
  			if (strlen(optarg) > 1 && optarg[0] == '0' &&
@@ -446,219 +452,217 @@ that are already used by our Debian-specific patches.
  				Tflag = (int)strtonum(optarg, 0, 255,
  				    &errstr);
  			if (Tflag < 0 || Tflag > 255 || errstr || errno)
-+# if defined(TLS)
++#ifdef HAVE_TLS
  				errx(1, "illegal tos/tls value %s", optarg);
-+# else
++#else
 +				errx(1, "illegal tos value %s", optarg);
-+# endif
++#endif
  			break;
  		default:
  			usage(1);
-@@ -429,6 +478,7 @@ main(int argc, char *argv[])
+@@ -425,6 +474,7 @@ main(int argc, char *argv[])
  	} else
  		usage(1);
  
-+# if defined(TLS)
++#ifdef HAVE_TLS
  	if (usetls) {
  		if (Cflag && unveil(Cflag, "r") == -1)
- 			err(1, "unveil");
-@@ -451,15 +501,19 @@ main(int argc, char *argv[])
- 				err(1, "unveil");
+ 			err(1, "unveil %s", Cflag);
+@@ -459,15 +509,19 @@ main(int argc, char *argv[])
+ 				err(1, "unveil /");
  		}
  	}
-+# endif
++#endif
  
  	if (!lflag && kflag)
  		errx(1, "must use -l with -k");
-+# if defined(TLS)
++#ifdef HAVE_TLS
  	if (uflag && usetls)
  		errx(1, "cannot use -c and -u");
  	if ((family == AF_UNIX) && usetls)
  		errx(1, "cannot use -c and -U");
-+# endif
++#endif
  	if ((family == AF_UNIX) && Fflag)
  		errx(1, "cannot use -F and -U");
-+# if defined(TLS)
++#ifdef HAVE_TLS
  	if (Fflag && usetls)
  		errx(1, "cannot use -c and -F");
  	if (TLSopt && !usetls)
-@@ -478,6 +532,7 @@ main(int argc, char *argv[])
+@@ -486,6 +540,7 @@ main(int argc, char *argv[])
  		errx(1, "you must specify -c to use -H");
  	if (tls_expectname && !usetls)
  		errx(1, "you must specify -c to use -e");
-+# endif
++#endif
  
  	/* Get name of temporary socket for unix datagram client */
  	if ((family == AF_UNIX) && uflag && !lflag) {
-@@ -544,6 +599,7 @@ main(int argc, char *argv[])
+@@ -552,6 +607,7 @@ main(int argc, char *argv[])
  			proxyhints.ai_flags |= AI_NUMERICHOST;
  	}
  
-+# if defined(TLS)
++#ifdef HAVE_TLS
  	if (usetls) {
  		if ((tls_cfg = tls_config_new()) == NULL)
  			errx(1, "unable to allocate TLS config");
-@@ -579,7 +635,8 @@ main(int argc, char *argv[])
- 				err(1, "pledge");
+@@ -588,6 +644,7 @@ main(int argc, char *argv[])
  		} else if (pledge("stdio inet dns", NULL) == -1)
  			err(1, "pledge");
--	}
-+ 	}
-+# endif
+ 	}
++#endif
  	if (lflag) {
  		ret = 0;
  
-@@ -590,6 +647,7 @@ main(int argc, char *argv[])
+@@ -598,6 +655,7 @@ main(int argc, char *argv[])
  				s = unix_listen(host);
  		}
  
-+# if defined(TLS)
++#ifdef HAVE_TLS
  		if (usetls) {
  			tls_config_verify_client_optional(tls_cfg);
  			if ((tls_ctx = tls_server()) == NULL)
-@@ -598,6 +656,7 @@ main(int argc, char *argv[])
+@@ -606,6 +664,7 @@ main(int argc, char *argv[])
  				errx(1, "tls configuration failed (%s)",
  				    tls_error(tls_ctx));
  		}
-+# endif
++#endif
  		/* Allow only one connection at a time, but stay alive. */
  		for (;;) {
  			if (family != AF_UNIX) {
-@@ -613,7 +672,11 @@ main(int argc, char *argv[])
+@@ -621,7 +680,11 @@ main(int argc, char *argv[])
  				 * let it receive datagrams from multiple
  				 * socket pairs.
  				 */
-+# if defined(TLS)
++#ifdef HAVE_TLS
  				readwrite(s, NULL);
-+# else
++#else
 +				readwrite(s);
-+# endif
++#endif
  			} else if (uflag && !kflag) {
  				/*
  				 * For UDP and not -k, we will use recvfrom()
-@@ -638,9 +701,14 @@ main(int argc, char *argv[])
- 					report_sock("Connection received",
- 					    (struct sockaddr *)&z, len, NULL);
+@@ -647,9 +710,14 @@ main(int argc, char *argv[])
+ 					    (struct sockaddr *)&z, len,
+ 					    family == AF_UNIX ? host : NULL);
  
-+# if defined(TLS)
++#ifdef HAVE_TLS
  				readwrite(s, NULL);
  			} else {
  				struct tls *tls_cctx = NULL;
-+# else
++#else
 +				readwrite(s);
 +			} else {
-+# endif
++#endif
  				int connfd;
  
  				len = sizeof(cliaddr);
-@@ -654,6 +722,7 @@ main(int argc, char *argv[])
+@@ -663,6 +731,7 @@ main(int argc, char *argv[])
  					report_sock("Connection received",
  					    (struct sockaddr *)&cliaddr, len,
  					    family == AF_UNIX ? host : NULL);
-+# if defined(TLS)
++#ifdef HAVE_TLS
  				if ((usetls) &&
  				    (tls_cctx = tls_setup_server(tls_ctx, connfd, host)))
  					readwrite(connfd, tls_cctx);
-@@ -663,6 +732,10 @@ main(int argc, char *argv[])
+@@ -672,6 +741,10 @@ main(int argc, char *argv[])
  					timeout_tls(s, tls_cctx, tls_close);
  				close(connfd);
  				tls_free(tls_cctx);
-+# else
++#else
 +				readwrite(connfd);
 +				close(connfd);
-+# endif
++#endif
  			}
- 			if (family == AF_UNIX && uflag) {
- 				if (connect(s, NULL, 0) < 0)
-@@ -677,7 +750,11 @@ main(int argc, char *argv[])
+ 
+ 			if (!kflag)
+@@ -682,7 +755,11 @@ main(int argc, char *argv[])
  
  		if ((s = unix_connect(host)) > 0) {
  			if (!zflag)
-+# if defined(TLS)
++#ifdef HAVE_TLS
  				readwrite(s, NULL);
-+# else
++#else
 +				readwrite(s);
-+# endif
++#endif
  			close(s);
  		} else {
  			warn("%s", host);
-@@ -698,6 +775,7 @@ main(int argc, char *argv[])
+@@ -702,6 +779,7 @@ main(int argc, char *argv[])
  		for (s = -1, i = 0; portlist[i] != NULL; i++) {
  			if (s != -1)
  				close(s);
-+# if defined(TLS)
++#ifdef HAVE_TLS
  			tls_free(tls_ctx);
  			tls_ctx = NULL;
  
-@@ -708,6 +786,7 @@ main(int argc, char *argv[])
+@@ -712,6 +790,7 @@ main(int argc, char *argv[])
  					errx(1, "tls configuration failed (%s)",
  					    tls_error(tls_ctx));
  			}
-+# endif
++#endif
  			if (xflag)
  				s = socks_connect(host, portlist[i], hints,
  				    proxy, proxyport, proxyhints, socksv,
-@@ -745,6 +824,7 @@ main(int argc, char *argv[])
+@@ -741,6 +820,7 @@ main(int argc, char *argv[])
  			}
  			if (Fflag)
  				fdpass(s);
-+# if defined(TLS)
++#ifdef HAVE_TLS
  			else {
  				if (usetls)
  					tls_setup_client(tls_ctx, s, host);
-@@ -753,13 +833,19 @@ main(int argc, char *argv[])
+@@ -749,13 +829,19 @@ main(int argc, char *argv[])
  				if (tls_ctx)
  					timeout_tls(s, tls_ctx, tls_close);
  			}
-+# else
++#else
 +			else if (!zflag)
 +				readwrite(s);
-+# endif
++#endif
  		}
  	}
  
  	if (s != -1)
  		close(s);
-+# if defined(TLS)
++#ifdef HAVE_TLS
  	tls_free(tls_ctx);
  	tls_config_free(tls_cfg);
-+# endif
++#endif
  
  	return ret;
  }
-@@ -801,6 +887,7 @@ unix_bind(char *path, int flags)
+@@ -797,6 +883,7 @@ unix_bind(char *path, int flags)
  	return s;
  }
  
-+# if defined(TLS)
++#ifdef HAVE_TLS
  int
  timeout_tls(int s, struct tls *tls_ctx, int (*func)(struct tls *))
  {
-@@ -887,6 +974,7 @@ tls_setup_server(struct tls *tls_ctx, in
+@@ -884,6 +971,7 @@ tls_setup_server(struct tls *tls_ctx, int connfd, char *host)
  	}
  	return NULL;
  }
-+# endif
++#endif
  
  /*
   * unix_connect()
-@@ -1112,7 +1200,11 @@ local_listen(const char *host, const cha
+@@ -1130,7 +1218,11 @@ local_listen(const char *host, const char *port, struct addrinfo hints)
   * Loop that polls on the network file descriptor and stdin.
   */
  void
-+# if defined(TLS)
++#ifdef HAVE_TLS
  readwrite(int net_fd, struct tls *tls_ctx)
-+# else
++#else
 +readwrite(int net_fd)
-+# endif
++#endif
  {
  	struct pollfd pfd[4];
  	int stdin_fd = STDIN_FILENO;
-@@ -1212,12 +1304,17 @@ readwrite(int net_fd, struct tls *tls_ct
+@@ -1230,12 +1322,17 @@ readwrite(int net_fd, struct tls *tls_ctx)
  		/* try to read from stdin */
  		if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) {
  			ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf,
-+# if defined(TLS)
++#ifdef HAVE_TLS
  			    &stdinbufpos, NULL);
  			if (ret == TLS_WANT_POLLIN)
  				pfd[POLL_STDIN].events = POLLIN;
@@ -666,18 +670,18 @@ that are already used by our Debian-specific patches.
  				pfd[POLL_STDIN].events = POLLOUT;
 -			else if (ret == 0 || ret == -1)
 +			else
-+# else
++#else
 +			    &stdinbufpos);
-+# endif
++#endif
 +			if (ret == 0 || ret == -1)
  				pfd[POLL_STDIN].fd = -1;
  			/* read something - poll net out */
  			if (stdinbufpos > 0)
-@@ -1229,12 +1326,17 @@ readwrite(int net_fd, struct tls *tls_ct
+@@ -1247,12 +1344,17 @@ readwrite(int net_fd, struct tls *tls_ctx)
  		/* try to write to network */
  		if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) {
  			ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf,
-+# if defined(TLS)
++#ifdef HAVE_TLS
  			    &stdinbufpos, tls_ctx);
  			if (ret == TLS_WANT_POLLIN)
  				pfd[POLL_NETOUT].events = POLLIN;
@@ -685,18 +689,18 @@ that are already used by our Debian-specific patches.
  				pfd[POLL_NETOUT].events = POLLOUT;
 -			else if (ret == -1)
 +			else
-+# else
++#else
 +			    &stdinbufpos);
-+# endif
++#endif
 +			if (ret == -1)
  				pfd[POLL_NETOUT].fd = -1;
  			/* buffer empty - remove self from polling */
  			if (stdinbufpos == 0)
-@@ -1246,12 +1348,17 @@ readwrite(int net_fd, struct tls *tls_ct
+@@ -1264,12 +1366,17 @@ readwrite(int net_fd, struct tls *tls_ctx)
  		/* try to read from network */
  		if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) {
  			ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf,
-+# if defined(TLS)
++#ifdef HAVE_TLS
  			    &netinbufpos, tls_ctx);
  			if (ret == TLS_WANT_POLLIN)
  				pfd[POLL_NETIN].events = POLLIN;
@@ -704,18 +708,18 @@ that are already used by our Debian-specific patches.
  				pfd[POLL_NETIN].events = POLLOUT;
 -			else if (ret == -1)
 +			else
-+# else
++#else
 +			    &netinbufpos);
-+# endif
++#endif
 +			if (ret == -1)
  				pfd[POLL_NETIN].fd = -1;
  			/* eof on net in - remove from pfd */
  			if (ret == 0) {
-@@ -1278,12 +1385,17 @@ readwrite(int net_fd, struct tls *tls_ct
+@@ -1296,12 +1403,17 @@ readwrite(int net_fd, struct tls *tls_ctx)
  		/* try to write to stdout */
  		if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) {
  			ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf,
-+# if defined(TLS)
++#ifdef HAVE_TLS
  			    &netinbufpos, NULL);
  			if (ret == TLS_WANT_POLLIN)
  				pfd[POLL_STDOUT].events = POLLIN;
@@ -723,94 +727,100 @@ that are already used by our Debian-specific patches.
  				pfd[POLL_STDOUT].events = POLLOUT;
 -			else if (ret == -1)
 +			else
-+# else
++#else
 +			    &netinbufpos);
-+# endif
++#endif
 +			if (ret == -1)
  				pfd[POLL_STDOUT].fd = -1;
  			/* buffer empty - remove self from polling */
  			if (netinbufpos == 0)
-@@ -1307,21 +1419,31 @@ readwrite(int net_fd, struct tls *tls_ct
+@@ -1325,7 +1437,11 @@ readwrite(int net_fd, struct tls *tls_ctx)
  }
  
  ssize_t
-+# if defined(TLS)
++#ifdef HAVE_TLS
  drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
-+# else
++#else
 +drainbuf(int fd, unsigned char *buf, size_t *bufpos)
-+# endif
++#endif
  {
  	ssize_t n;
  	ssize_t adjust;
+@@ -1333,16 +1449,22 @@ drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
+ 	if (fd == -1)
+ 		return -1;
  
-+# if defined(TLS)
++#ifdef HAVE_TLS
  	if (tls) {
  		n = tls_write(tls, buf, *bufpos);
  		if (n == -1)
  			errx(1, "tls write failed (%s)", tls_error(tls));
  	} else {
-+# endif
++#endif
  		n = write(fd, buf, *bufpos);
  		/* don't treat EAGAIN, EINTR as error */
  		if (n == -1 && (errno == EAGAIN || errno == EINTR))
-+# if defined(TLS)
++#ifdef HAVE_TLS
  			n = TLS_WANT_POLLOUT;
  	}
-+# else
++#else
 +			n = -2;
-+# endif
++#endif
  	if (n <= 0)
  		return n;
  	/* adjust buffer */
-@@ -1333,21 +1455,31 @@ drainbuf(int fd, unsigned char *buf, siz
+@@ -1354,7 +1476,11 @@ drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
  }
  
  ssize_t
-+# if defined(TLS)
++#ifdef HAVE_TLS
  fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
-+# else
++#else
 +fillbuf(int fd, unsigned char *buf, size_t *bufpos)
-+# endif
++#endif
  {
  	size_t num = BUFSIZE - *bufpos;
  	ssize_t n;
+@@ -1362,16 +1488,22 @@ fillbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
+ 	if (fd == -1)
+ 		return -1;
  
-+# if defined(TLS)
++#ifdef HAVE_TLS
  	if (tls) {
  		n = tls_read(tls, buf + *bufpos, num);
  		if (n == -1)
  			errx(1, "tls read failed (%s)", tls_error(tls));
  	} else {
-+# endif
++#endif
  		n = read(fd, buf + *bufpos, num);
  		/* don't treat EAGAIN, EINTR as error */
  		if (n == -1 && (errno == EAGAIN || errno == EINTR))
-+# if defined(TLS)
++#ifdef HAVE_TLS
  			n = TLS_WANT_POLLIN;
  	}
-+# else
++#else
 +			n = -2;
-+# endif
++#endif
  	if (n <= 0)
  		return n;
  	*bufpos += n;
-@@ -1665,6 +1797,7 @@ process_tos_opt(char *s, int *val)
+@@ -1718,6 +1850,7 @@ process_tos_opt(char *s, int *val)
  	return 0;
  }
  
-+# if defined(TLS)
++#ifdef HAVE_TLS
  int
  process_tls_opt(char *s, int *flags)
  {
-@@ -1778,6 +1911,7 @@ report_tls(struct tls * tls_ctx, char *
- 
+@@ -1831,6 +1964,7 @@ report_tls(struct tls *tls_ctx, char *host)
+ 		break;
  	}
  }
-+# endif
++#endif
  
  void
  report_sock(const char *msg, const struct sockaddr *sa, socklen_t salen,
-@@ -1816,17 +1950,12 @@ help(void)
+@@ -1872,17 +2006,12 @@ help(void)
  	fprintf(stderr, "\tCommand Summary:\n\
  	\t-4		Use IPv4\n\
  	\t-6		Use IPv6\n\
@@ -828,7 +838,7 @@ that are already used by our Debian-specific patches.
  	\t-k		Keep inbound sockets open for multiple connects\n\
  	\t-l		Listen mode, for inbound connects\n\
  	\t-M ttl		Outgoing TTL / Hop Limit\n\
-@@ -1834,14 +1963,12 @@ help(void)
+@@ -1890,14 +2019,12 @@ help(void)
  	\t-N		Shutdown the network socket after EOF on stdin\n\
  	\t-n		Suppress name/port resolutions\n\
  	\t-O length	TCP send buffer length\n\
@@ -838,13 +848,13 @@ that are already used by our Debian-specific patches.
 -	\t-R CAfile	CA bundle\n\
  	\t-r		Randomize remote ports\n\
  	\t-S		Enable the TCP MD5 signature option\n\
- 	\t-s source	Local source address\n\
+ 	\t-s sourceaddr	Local source address\n\
 -	\t-T keyword	TOS value or TLS options\n\
 +	\t-T keyword	TOS value\n\
  	\t-t		Answer TELNET negotiation\n\
  	\t-U		Use UNIX domain socket\n\
  	\t-u		UDP mode\n\
-@@ -1851,7 +1978,6 @@ help(void)
+@@ -1907,7 +2034,6 @@ help(void)
  	\t-w timeout	Timeout for connects and final net reads\n\
  	\t-X proto	Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
  	\t-x addr[:port]\tSpecify proxy address and port\n\
@@ -852,7 +862,7 @@ that are already used by our Debian-specific patches.
  	\t-z		Zero-I/O mode [used for scanning]\n\
  	Port numbers can be individual or ranges: lo-hi [inclusive]\n");
  	exit(0);
-@@ -1861,15 +1987,11 @@ void
+@@ -1917,15 +2043,11 @@ void
  usage(int ret)
  {
  	fprintf(stderr,
@@ -863,10 +873,11 @@ that are already used by our Debian-specific patches.
 -	    "[-R CAfile]\n"
 +	    "usage: nc [-46DdFhklNnrStUuvz] [-I length] [-i interval] [-M ttl]\n"
 +	    "\t  [-m minttl] [-O length] [-P proxy_username] [-p source_port]\n"
- 	    "\t  [-s source] [-T keyword] [-V rtable] [-W recvlimit] "
+ 	    "\t  [-s sourceaddr] [-T keyword] [-V rtable] [-W recvlimit] "
  	    "[-w timeout]\n"
- 	    "\t  [-X proxy_protocol] [-x proxy_address[:port]] "
+-	    "\t  [-X proxy_protocol] [-x proxy_address[:port]] "
 -	    "[-Z peercertfile]\n"
++	    "\t  [-X proxy_protocol] [-x proxy_address[:port]]\n"
  	    "\t  [destination] [port]\n");
  	if (ret)
  		exit(1);

connect-timeout.patch

@@ -1,11 +1,13 @@
 From: Aron Xu <aron@debian.org>
 Date: Mon, 13 Feb 2012 14:43:56 +0800
-Subject: connect timeout
+Subject: Fix connect() timeout
 
 ---
- netcat.c |   78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
- 1 file changed, 76 insertions(+), 2 deletions(-)
+ netcat.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
+ 1 file changed, 77 insertions(+), 5 deletions(-)
 
+diff --git a/netcat.c b/netcat.c
+index bec6e46..461e2bd 100644
 --- a/netcat.c
 +++ b/netcat.c
 @@ -90,6 +90,7 @@
@@ -27,34 +29,43 @@ Subject: connect timeout
  /* Command Line Options */
  int	dflag;					/* detached, no stdin */
  int	Fflag;					/* fdpass sock to stdout */
-@@ -214,6 +219,9 @@ ssize_t drainbuf(int, unsigned char *, s
+@@ -215,6 +220,8 @@ ssize_t drainbuf(int, unsigned char *, size_t *);
  ssize_t fillbuf(int, unsigned char *, size_t *);
- # endif
+ #endif
  
-+static int connect_with_timeout(int fd, const struct sockaddr *sa,
-+        socklen_t salen, int ctimeout);
++static int connect_with_timeout(int, const struct sockaddr *, socklen_t, int);
 +
  int
  main(int argc, char *argv[])
  {
-@@ -1078,11 +1086,14 @@ remote_connect(const char *host, const c
- 
- 		set_common_sockopts(s, res->ai_family);
+@@ -1088,18 +1095,21 @@ remote_connect(const char *host, const char *port, struct addrinfo hints,
+ 			}
+ 		}
  
 -		if (timeout_connect(s, res->ai_addr, res->ai_addrlen) == 0)
-+		if ((error = connect_with_timeout(s, res->ai_addr, res->ai_addrlen, timeout)) == CONNECTION_SUCCESS)
++		if ((error = connect_with_timeout(s, res->ai_addr, res->ai_addrlen,
++		    timeout)) == CONNECTION_SUCCESS)
  			break;
--		if (vflag)
-+		if (vflag && error == CONNECTION_FAILED)
- 			warn("connect to %s port %s (%s) failed", host, port,
- 			    uflag ? "udp" : "tcp");
-+                else if (vflag && error == CONNECTION_TIMEOUT)
-+                    warn("connect to %s port %s (%s) timed out", host, port,
-+                            uflag ? "udp" : "tcp");
+ 
+ 		if (vflag) {
+ 			/* only print IP if there is something to report */
+ 			if (nflag || ipaddr == NULL ||
+ 			    (strncmp(host, ipaddr, NI_MAXHOST) == 0))
+-				warn("connect to %s port %s (%s) failed", host,
+-				    port, uflag ? "udp" : "tcp");
++				warn("connect to %s port %s (%s) %s", host,
++				    port, uflag ? "udp" : "tcp",
++				    error == CONNECTION_TIMEOUT ? "timed out" : "failed");
+ 			else
+-				warn("connect to %s (%s) port %s (%s) failed",
+-				    host, ipaddr, port, uflag ? "udp" : "tcp");
++				warn("connect to %s (%s) port %s (%s) %s",
++				    host, ipaddr, port, uflag ? "udp" : "tcp",
++				    error == CONNECTION_TIMEOUT ? "timed out" : "failed");
+ 		}
  
  		save_errno = errno;
- 		close(s);
-@@ -1123,6 +1134,69 @@ timeout_connect(int s, const struct sock
+@@ -1141,6 +1151,68 @@ timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
  	return ret;
  }
  
@@ -95,8 +106,7 @@ Subject: connect timeout
 +
 +		/* call select */
 +		do {
-+			err = select(fd + 1, NULL, &connect_fdset,
-+				     NULL, tvp);
++			err = select(fd + 1, NULL, &connect_fdset, NULL, tvp);
 +		} while (err < 0 && errno == EINTR);
 +
 +		/* select error */

dccp-support.patch

@@ -1,12 +1,14 @@
 From: Aron Xu <aron@debian.org>
 Date: Mon, 13 Feb 2012 15:56:51 +0800
-Subject: dccp support
+Subject: New flag '-Z' for DCCP support
 
 ---
- nc.1     |    4 ++
- netcat.c |   89 +++++++++++++++++++++++++++++++++++++++++++++++++++++----------
- 2 files changed, 79 insertions(+), 14 deletions(-)
+ nc.1     |  4 ++-
+ netcat.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++++++---------
+ 2 files changed, 76 insertions(+), 13 deletions(-)
 
+diff --git a/nc.1 b/nc.1
+index fbcc098..da37f06 100644
 --- a/nc.1
 +++ b/nc.1
 @@ -33,7 +33,7 @@
@@ -18,7 +20,7 @@ Subject: dccp support
  .Op Fl I Ar length
  .Op Fl i Ar interval
  .Op Fl M Ar ttl
-@@ -289,6 +289,8 @@ An IPv6 address can be specified unambig
+@@ -288,6 +288,8 @@ An IPv6 address can be specified unambiguously by enclosing
  in square brackets.
  A proxy cannot be used with any of the options
  .Fl lsuU .
@@ -27,6 +29,8 @@ Subject: dccp support
  .It Fl z
  Only scan for listening daemons, without sending any data to them.
  Cannot be used together with
+diff --git a/netcat.c b/netcat.c
+index dd893ac..1c50615 100644
 --- a/netcat.c
 +++ b/netcat.c
 @@ -146,6 +146,7 @@ int	rflag;					/* Random ports flag */
@@ -37,49 +41,49 @@ Subject: dccp support
  int	vflag;					/* Verbosity */
  int	xflag;					/* Socks proxy */
  int	zflag;					/* Port Scan Flag */
-@@ -224,6 +225,7 @@ ssize_t drainbuf(int, unsigned char *, s
+@@ -225,6 +226,7 @@ ssize_t drainbuf(int, unsigned char *, size_t *, int);
  ssize_t fillbuf(int, unsigned char *, size_t *);
- # endif
+ #endif
  
-+char *proto_name(int uflag, int dccpflag);
- static int connect_with_timeout(int fd, const struct sockaddr *sa,
-         socklen_t salen, int ctimeout);
++char *proto_name(int, int);
+ static int connect_with_timeout(int, const struct sockaddr *, socklen_t, int);
+ static void quit(int sig);
  
-@@ -263,7 +265,7 @@ main(int argc, char *argv[])
- # if defined(TLS)
+@@ -261,7 +263,7 @@ main(int argc, char *argv[])
+ #ifdef HAVE_TLS
  	    "46C:cDde:FH:hI:i:K:klM:m:NnO:o:P:p:q:R:rSs:T:tUuV:vW:w:X:x:Z:z"))
- # else
+ #else
 -	    "46CDdFhI:i:klM:m:NnO:P:p:q:rSs:T:tUuV:vW:w:X:x:z"))
 +	    "46CDdFhI:i:klM:m:NnO:P:p:q:rSs:T:tUuV:vW:w:X:x:Zz"))
- # endif
+ #endif
  	    != -1) {
  		switch (ch) {
-@@ -380,6 +382,13 @@ main(int argc, char *argv[])
+@@ -378,6 +380,13 @@ main(int argc, char *argv[])
  		case 'u':
  			uflag = 1;
  			break;
 +		case 'Z':
-+# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
++#if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
 +			dccpflag = 1;
-+# else
++#else
 +			errx(1, "no DCCP support available");
-+# endif
++#endif
 +			break;
  		case 'V':
- # if defined(RT_TABLEID_MAX)
+ #ifdef RT_TABLEID_MAX
  			rtableid = (int)strtonum(optarg, 0,
-@@ -484,6 +493,10 @@ main(int argc, char *argv[])
+@@ -482,6 +491,10 @@ main(int argc, char *argv[])
  
  	/* Cruft to make sure options are clean, and used properly. */
- 	if (argv[0] && !argv[1] && family == AF_UNIX) {
-+# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
+ 	if (argc == 1 && family == AF_UNIX) {
++#if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
 +		if (dccpflag)
 +			errx(1, "cannot use -Z and -U");
-+# endif
++#endif
  		host = argv[0];
- 		uport = NULL;
- 	} else if (!argv[0] && lflag) {
-@@ -577,8 +590,20 @@ main(int argc, char *argv[])
+ 	} else if (argc == 0 && lflag) {
+ 		if (sflag)
+@@ -583,8 +596,20 @@ main(int argc, char *argv[])
  	if (family != AF_UNIX) {
  		memset(&hints, 0, sizeof(struct addrinfo));
  		hints.ai_family = family;
@@ -89,12 +93,12 @@ Subject: dccp support
 +			hints.ai_socktype = SOCK_DGRAM;
 +			hints.ai_protocol = IPPROTO_UDP;
 +		}
-+# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
++#if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
 +		else if (dccpflag) {
 +			hints.ai_socktype = SOCK_DCCP;
 +			hints.ai_protocol = IPPROTO_DCCP;
 +		}
-+# endif
++#endif
 +		else {
 +			hints.ai_socktype = SOCK_STREAM;
 +			hints.ai_protocol = IPPROTO_TCP;
@@ -102,59 +106,47 @@ Subject: dccp support
  		if (nflag)
  			hints.ai_flags |= AI_NUMERICHOST;
  	}
-@@ -586,7 +611,10 @@ main(int argc, char *argv[])
+@@ -592,7 +617,10 @@ main(int argc, char *argv[])
  	if (xflag) {
  		if (uflag)
  			errx(1, "no proxy support for UDP mode");
 -
-+# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
++#if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
 +		if (dccpflag)
 +			errx(1, "no proxy support for DCCP mode");
-+# endif
++#endif
  		if (lflag)
  			errx(1, "no proxy support for listen");
  
-@@ -833,19 +861,20 @@ main(int argc, char *argv[])
+@@ -838,9 +866,11 @@ main(int argc, char *argv[])
+ 						continue;
  					}
  				}
- 
+-				if (print_info == 1)
++				if (print_info == 1) {
 +					char *proto = proto_name(uflag, dccpflag);
- 				/* Don't look up port if -n. */
- 				if (nflag)
- 					sv = NULL;
- 				else {
- 					sv = getservbyport(
- 					    ntohs(atoi(portlist[i])),
--					    uflag ? "udp" : "tcp");
-+					    proto);
- 				}
- 
- 				fprintf(stderr,
- 				    "Connection to %s %s port [%s/%s] "
- 				    "succeeded!\n", host, portlist[i],
--				    uflag ? "udp" : "tcp",
-+				    proto,
- 				    sv ? sv->s_name : "*");
+ 					connection_info(host, portlist[i],
+-					    uflag ? "udp" : "tcp", ipaddr);
++					    proto, ipaddr);
++				}
  			}
  			if (Fflag)
-@@ -1060,6 +1089,24 @@ unix_listen(char *path)
+ 				fdpass(s);
+@@ -1054,6 +1084,21 @@ unix_listen(char *path)
  	return s;
  }
  
 +char *proto_name(int uflag, int dccpflag) {
-+
 +	char *proto = NULL;
-+    if (uflag) {
++
++	if (uflag)
 +		proto = "udp";
-+    }
-+# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
-+    else if (dccpflag) {
++#if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
++	else if (dccpflag)
 +		proto = "dccp";
-+    }
-+# endif
-+    else {
++#endif
++	else
 +		proto = "tcp";
-+    }
 +
 +	return proto;
 +}
@@ -162,8 +154,8 @@ Subject: dccp support
  /*
   * remote_connect()
   * Returns a socket connected to a remote host. Properly binds to a local
-@@ -1090,8 +1137,21 @@ remote_connect(const char *host, const c
- # endif
+@@ -1085,8 +1130,20 @@ remote_connect(const char *host, const char *port, struct addrinfo hints,
+ #endif
  			memset(&ahints, 0, sizeof(struct addrinfo));
  			ahints.ai_family = res->ai_family;
 -			ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
@@ -171,14 +163,13 @@ Subject: dccp support
 +			if (uflag) {
 +				ahints.ai_socktype = SOCK_DGRAM;
 +				ahints.ai_protocol = IPPROTO_UDP;
-+
 +			}
-+# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
++#if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
 +			else if (dccpflag) {
 +				hints.ai_socktype = SOCK_DCCP;
 +				hints.ai_protocol = IPPROTO_DCCP;
 +			}
-+# endif
++#endif
 +			else {
 +				ahints.ai_socktype = SOCK_STREAM;
 +				ahints.ai_protocol = IPPROTO_TCP;
@@ -186,27 +177,28 @@ Subject: dccp support
  			ahints.ai_flags = AI_PASSIVE;
  			if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
  				errx(1, "getaddrinfo: %s", gai_strerror(error));
-@@ -1103,15 +1163,16 @@ remote_connect(const char *host, const c
+@@ -1116,16 +1173,18 @@ remote_connect(const char *host, const char *port, struct addrinfo hints,
+ 		    timeout)) == CONNECTION_SUCCESS)
+ 			break;
+ 
++		char *proto = proto_name(uflag, dccpflag);
++
+ 		if (vflag) {
+ 			/* only print IP if there is something to report */
+ 			if (nflag || ipaddr == NULL ||
+ 			    (strncmp(host, ipaddr, NI_MAXHOST) == 0))
+ 				warn("connect to %s port %s (%s) %s", host,
+-				    port, uflag ? "udp" : "tcp",
++				    port, proto,
+ 				    error == CONNECTION_TIMEOUT ? "timed out" : "failed");
+ 			else
+ 				warn("connect to %s (%s) port %s (%s) %s",
+-				    host, ipaddr, port, uflag ? "udp" : "tcp",
++				    host, ipaddr, port, proto,
+ 				    error == CONNECTION_TIMEOUT ? "timed out" : "failed");
  		}
  
- 		set_common_sockopts(s, res->ai_family);
-+		char *proto = proto_name(uflag, dccpflag);
- 
- 		if ((error = connect_with_timeout(s, res->ai_addr, res->ai_addrlen, timeout)) == CONNECTION_SUCCESS)
- 			break;
- 		if (vflag && error == CONNECTION_FAILED)
- 			warn("connect to %s port %s (%s) failed", host, port,
--			    uflag ? "udp" : "tcp");
--                else if (vflag && error == CONNECTION_TIMEOUT)
-+			     proto);
-+		else if (vflag && error == CONNECTION_TIMEOUT)
-                     warn("connect to %s port %s (%s) timed out", host, port,
--                            uflag ? "udp" : "tcp");
-+                            proto);
- 
- 		save_errno = errno;
- 		close(s);
-@@ -1715,7 +1776,8 @@ build_ports(char *p)
+@@ -1742,7 +1801,8 @@ build_ports(char *p)
  	int hi, lo, cp;
  	int x = 0;
  
@@ -216,7 +208,7 @@ Subject: dccp support
  	if (sv) {
  		if (asprintf(&portlist[0], "%d", ntohs(sv->s_port)) < 0)
  			err(1, "asprintf");
-@@ -2095,6 +2157,7 @@ help(void)
+@@ -2155,6 +2215,7 @@ help(void)
  	\t-w timeout	Timeout for connects and final net reads\n\
  	\t-X proto	Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
  	\t-x addr[:port]\tSpecify proxy address and port\n\
@@ -224,12 +216,12 @@ Subject: dccp support
  	\t-z		Zero-I/O mode [used for scanning]\n\
  	Port numbers can be individual or ranges: lo-hi [inclusive]\n");
  	exit(0);
-@@ -2104,7 +2167,7 @@ void
+@@ -2164,7 +2225,7 @@ void
  usage(int ret)
  {
  	fprintf(stderr,
 -	    "usage: nc [-46CDdFhklNnrStUuvz] [-I length] [-i interval] [-M ttl]\n"
 +	    "usage: nc [-46CDdFhklNnrStUuvZz] [-I length] [-i interval] [-M ttl]\n"
  	    "\t  [-m minttl] [-O length] [-P proxy_username] [-p source_port]\n"
- 	    "\t  [-q seconds] [-s source] [-T keyword] [-V rtable] [-W recvlimit] "
- 	    "[-w timeout]\n"
+ 	    "\t  [-q seconds] [-s sourceaddr] [-T keyword] [-V rtable] [-W recvlimit]\n"
+ 	    "\t  [-w timeout] [-X proxy_protocol] [-x proxy_address[:port]]\n"

destination-port-list.patch

@@ -1,15 +1,17 @@
 From: Guilhem Moulin <guilhem@debian.org>
 Date: Mon, 22 Oct 2018 04:15:52 +0200
-Subject: destination port list
+Subject: Add ability to specify a list of destination ports
 
 ---
- nc.1     |   26 ++++++++++++++++---
- netcat.c |   86 ++++++++++++++++++++++++++++++++-------------------------------
+ nc.1     | 26 +++++++++++++++++---
+ netcat.c | 86 +++++++++++++++++++++++++++++++++-------------------------------
  2 files changed, 68 insertions(+), 44 deletions(-)
 
+diff --git a/nc.1 b/nc.1
+index 49a3d4d..80c654c 100644
 --- a/nc.1
 +++ b/nc.1
-@@ -414,15 +414,35 @@ The
+@@ -417,15 +417,35 @@ The
  flag can be used to tell
  .Nm
  to report open ports,
@@ -48,6 +50,8 @@ Subject: destination port list
  .Pp
  Alternatively, it might be useful to know which server software
  is running, and which versions.
+diff --git a/netcat.c b/netcat.c
+index 990c31b..bef27a4 100644
 --- a/netcat.c
 +++ b/netcat.c
 @@ -191,7 +191,7 @@ int minttl = -1;
@@ -58,31 +62,30 @@ Subject: destination port list
 +void	build_ports(char **);
  void	help(void) __attribute__((noreturn));
  int	local_listen(const char *, const char *, struct addrinfo);
- # if defined(TLS)
-@@ -242,7 +242,7 @@ int
+ #ifdef HAVE_TLS
+@@ -241,7 +241,7 @@ int
  main(int argc, char *argv[])
  {
  	int ch, s = -1, ret, socksv;
 -	char *host, *uport;
 +	char *host, **uport;
+ 	char ipaddr[NI_MAXHOST];
  	struct addrinfo hints;
- 	struct servent *sv;
  	socklen_t len;
-@@ -526,11 +526,11 @@ main(int argc, char *argv[])
- 	} else if (argv[0] && !argv[1]) {
- 		if (!lflag)
- 			usage(1);
+@@ -521,10 +521,10 @@ main(int argc, char *argv[])
+ 		if (zflag)
+ 			errx(1, "cannot use -z and -l");
+ 	} else if (argc == 1 && lflag) {
 -		uport = argv[0];
 +		uport = &argv[0];
- 		host = NULL;
- 	} else if (argv[0] && argv[1]) {
+ 	} else if (argc == 2) {
  		host = argv[0];
 -		uport = argv[1];
 +		uport = &argv[1];
  	} else
  		usage(1);
  
-@@ -717,7 +717,7 @@ main(int argc, char *argv[])
+@@ -723,7 +723,7 @@ main(int argc, char *argv[])
  			else
  				s = unix_listen(host);
  		} else
@@ -91,7 +94,7 @@ Subject: destination port list
  		if (s < 0)
  			err(1, NULL);
  
-@@ -1785,57 +1785,61 @@ strtoport(char *portstr, int udp)
+@@ -1810,57 +1810,61 @@ strtoport(char *portstr, int udp)
   * that we should try to connect to.
   */
  void
@@ -130,7 +133,7 @@ Subject: destination port list
 -			for (x = 0; x <= hi - lo; x++) {
 -				cp = arc4random_uniform(x + 1);
 -				portlist[x] = portlist[cp];
--				if (asprintf(&portlist[cp], "%d", x + lo) < 0)
+-				if (asprintf(&portlist[cp], "%d", x + lo) == -1)
 -					err(1, "asprintf");
 +	for (i = 0; p[i] != NULL; i++) {
 +		sv = getservbyname(p[i], proto);
@@ -154,7 +157,7 @@ Subject: destination port list
 +
 +			/* Load ports sequentially. */
  			for (cp = lo; cp <= hi; cp++) {
- 				if (asprintf(&portlist[x], "%d", cp) < 0)
+ 				if (asprintf(&portlist[x], "%d", cp) == -1)
  					err(1, "asprintf");
  				x++;
  			}

enable-udp-ip_recverr.patch

@@ -1,9 +1,9 @@
-Index: netcat-openbsd-1.203/netcat.c
+Index: netcat-openbsd-1.229/netcat.c
 ===================================================================
---- netcat-openbsd-1.203.orig/netcat.c
-+++ netcat-openbsd-1.203/netcat.c
-@@ -1889,6 +1889,21 @@ udptest(int s)
- 	return 1;
+--- netcat-openbsd-1.229.orig/netcat.c	2025-06-04 07:36:53.985608901 +0000
++++ netcat-openbsd-1.229/netcat.c	2025-06-04 07:37:13.091297946 +0000
+@@ -1990,6 +1990,21 @@ connection_info(const char *host, const
+ 	fprintf(stderr, " %s port [%s/%s] succeeded!\n", port, proto, service);
  }
  
 +static int
@@ -24,7 +24,7 @@ Index: netcat-openbsd-1.203/netcat.c
  void
  set_common_sockopts(int s, const struct sockaddr* sa)
  {
-@@ -1982,6 +1997,8 @@ set_common_sockopts(int s, const struct
+@@ -2084,6 +2099,8 @@ set_common_sockopts(int s, const struct
  			errx(1, "can't set IPv6 min hop count (unavailable)");
  #endif
  	}

get-sev-by-name.patch

@@ -1,14 +1,16 @@
 From: Aron Xu <aron@debian.org>
 Date: Mon, 13 Feb 2012 14:45:08 +0800
-Subject: get sev by name
+Subject: Add ability to specify destination ports by name
 
 ---
  netcat.c | 7 ++++++-
  1 file changed, 6 insertions(+), 1 deletion(-)
 
+diff --git a/netcat.c b/netcat.c
+index 461e2bd..2dc1abd 100644
 --- a/netcat.c
 +++ b/netcat.c
-@@ -1679,11 +1679,16 @@ strtoport(char *portstr, int udp)
+@@ -1700,11 +1700,16 @@ strtoport(char *portstr, int udp)
  void
  build_ports(char *p)
  {

make-getnameinfo-errors-nonfatal-in-report_sock.patch

@@ -0,0 +1,30 @@
+From: Guilhem Moulin <guilhem@debian.org>
+Date: Fri, 5 Jun 2020 03:11:21 +0200
+Subject: Make getnameinfo(3) errors non-fatal in report_sock()
+
+report_sock() is used to show the peer's address/name and port when the
+‘-v’ flag is set.  Reverse resolution errors need not be fatal.
+
+Bug-Debian: https://bugs.debian.org/961378
+---
+ netcat.c | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/netcat.c b/netcat.c
+index 0caba28..061a774 100644
+--- a/netcat.c
++++ b/netcat.c
+@@ -2220,9 +2220,11 @@ report_sock(const char *msg, const struct sockaddr *sa, socklen_t salen,
+ 	case 0:
+ 		break;
+ 	case EAI_SYSTEM:
+-		err(1, "getnameinfo");
++		warn("getnameinfo");
++		return;
+ 	default:
+-		errx(1, "getnameinfo: %s", gai_strerror(herr));
++		warnx("getnameinfo: %s", gai_strerror(herr));
++		return;
+ 	}
+ 
+ 	fprintf(stderr, "%s on %s %s\n", msg, host, port);

misc-failures-and-features.patch

@@ -1,31 +1,20 @@
 From: Aron Xu <aron@debian.org>
 Date: Mon, 13 Feb 2012 19:06:52 +0800
-Subject: misc failures and features
+Subject: Misc failures and features
 
 ---
- Makefile |    3 ++-
  nc.1     | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
- netcat.c |   14 ++++++++++++--
- 3 files changed, 65 insertions(+), 3 deletions(-)
+ netcat.c | 37 +++++++++++++++++++++++++++++--------
+ 2 files changed, 80 insertions(+), 8 deletions(-)
 
---- a/Makefile
-+++ b/Makefile
-@@ -3,7 +3,8 @@
- PROG=	nc
- SRCS=	netcat.c atomicio.c socks.c
- 
--LIBS=  `pkg-config --libs libbsd` -lresolv
-+PKG_CONFIG ?= pkg-config
-+LIBS=  `$(PKG_CONFIG) --libs libbsd` -lresolv
- OBJS=  $(SRCS:.c=.o)
- CFLAGS=  -g -O2
- LDFLAGS=  -Wl,--no-add-needed
+diff --git a/nc.1 b/nc.1
+index 8285c10..a159c73 100644
 --- a/nc.1
 +++ b/nc.1
-@@ -365,6 +365,54 @@ and which side is being used as a
- The connection may be terminated using an
- .Dv EOF
- .Pq Sq ^D .
+@@ -371,6 +371,54 @@ The connection may be terminated using an
+ as the
+ .Fl N
+ flag was given.
 +.Pp
 +There is no
 +.Fl c
@@ -77,7 +66,7 @@ Subject: misc failures and features
  .Sh DATA TRANSFER
  The example in the previous section can be expanded to build a
  basic data transfer model.
-@@ -517,6 +565,9 @@ Original implementation by
+@@ -523,6 +571,9 @@ Original implementation by
  .br
  Rewritten with IPv6 support by
  .An Eric Jackson Aq Mt ericj@monkey.org .
@@ -87,59 +76,92 @@ Subject: misc failures and features
  .Sh CAVEATS
  UDP port scans using the
  .Fl uz
+diff --git a/netcat.c b/netcat.c
+index 2f8890b..2a3714a 100644
 --- a/netcat.c
 +++ b/netcat.c
-@@ -98,6 +98,7 @@
- #include <netdb.h>
- #include <poll.h>
- #include <signal.h>
-+#include <stddef.h>
- #include <stdarg.h>
- #include <stdio.h>
- #include <stdlib.h>
-@@ -246,7 +247,10 @@ main(int argc, char *argv[])
- 	struct addrinfo hints;
- 	struct servent *sv;
- 	socklen_t len;
--	struct sockaddr_storage cliaddr;
-+	union {
-+		struct sockaddr_storage storage;
-+		struct sockaddr_un forunix;
-+	} cliaddr;
- 	char *proxy = NULL, *proxyport = NULL;
- 	const char *errstr;
- 	struct addrinfo proxyhints;
-@@ -945,6 +949,8 @@ unix_bind(char *path, int flags)
- 	    0)) < 0)
+@@ -114,7 +114,7 @@
+ #include "atomicio.h"
+ 
+ #define PORT_MAX	65535
+-#define UNIX_DG_TMP_SOCKET_SIZE	19
++#define UNIX_DG_TMP_SOCKET_SIZE	25
+ 
+ #define POLL_STDIN	0
+ #define POLL_NETOUT	1
+@@ -618,10 +618,20 @@ main(int argc, char *argv[])
+ 		if (sflag) {
+ 			unix_dg_tmp_socket = sflag;
+ 		} else {
+-			strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
++			/* On Linux it's tempting to use abstract sockets here in
++			 * order to limit bookkeeping and avoid cluttering /tmp.
++			 * Unfortunately though this has security implications, as a
++			 * second client could inject server responses if they
++			 * manage to connect(2) to the temporary socket between the
++			 * first client's bind(2) and connect(2) calls.  OTOH for
++			 * pathname sockets the injection is only possible on Linux
++			 * when write access to the socket is granted. */
++			strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc-XXXXXX",
++			    UNIX_DG_TMP_SOCKET_SIZE);
++			if (mkdtemp(unix_dg_tmp_socket_buf) == NULL)
++				err(1, "mkdtemp");
++			strlcat(unix_dg_tmp_socket_buf, "/recv.sock",
+ 			    UNIX_DG_TMP_SOCKET_SIZE);
+-			if (mktemp(unix_dg_tmp_socket_buf) == NULL)
+-				err(1, "mktemp");
+ 			unix_dg_tmp_socket = unix_dg_tmp_socket_buf;
+ 		}
+ 	}
+@@ -851,8 +861,14 @@ main(int argc, char *argv[])
+ 			ret = 1;
+ 		}
+ 
+-		if (uflag)
++		if (uflag && !sflag) {
+ 			unlink(unix_dg_tmp_socket);
++			char *nam = strrchr(unix_dg_tmp_socket, '/');
++			if (nam != NULL) {
++				nam[0] = '\0';
++				rmdir(unix_dg_tmp_socket);
++			}
++		}
+ 		return ret;
+ 	} else {
+ 		int i = 0;
+@@ -991,6 +1007,11 @@ unix_bind(char *path, int flags)
+ 	    0)) == -1)
  		return -1;
  
++#ifdef __linux__
++	if (path[0] != '@')
++#endif
 +	unlink(path);
 +
- 	memset(&s_un, 0, sizeof(struct sockaddr_un));
- 	s_un.sun_family = AF_UNIX;
- 
-@@ -1070,8 +1076,10 @@ unix_connect(char *path)
- 		if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) < 0)
- 			return -1;
- 	} else {
--		if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0)
-+		if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0) {
-+			errx(1, "create unix socket failed");
- 			return -1;
-+		}
- 	}
- 
- 	memset(&s_un, 0, sizeof(struct sockaddr_un));
-@@ -1081,10 +1089,12 @@ unix_connect(char *path)
- 	    sizeof(s_un.sun_path)) {
- 		close(s);
- 		errno = ENAMETOOLONG;
-+		warn("unix connect abandoned");
- 		return -1;
- 	}
- 	if (connect(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
+ 	if (bind(s, (struct sockaddr *)&s_un, addrlen) == -1) {
  		save_errno = errno;
-+		warn("unix connect failed");
  		close(s);
- 		errno = save_errno;
+@@ -1108,7 +1129,7 @@ unix_connect(char *path)
+ 
+ 	if (uflag) {
+ 		if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) == -1)
+-			return -1;
++			err(1, "%s", unix_dg_tmp_socket);
+ 	} else {
+ 		if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) == -1)
  			return -1;
+@@ -1381,12 +1402,12 @@ local_listen(const char *host, const char *port, struct addrinfo hints)
+ 
+ 		ret = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &x, sizeof(x));
+ 		if (ret == -1)
+-			err(1, NULL);
++			warn("Couldn't set SO_REUSEADDR");
+ 
+ #ifdef SO_REUSEPORT
+ 		ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
+ 		if (ret == -1)
+-			err(1, NULL);
++			warn("Couldn't set SO_REUSEPORT");
+ #endif
+ 
+ 		set_common_sockopts(s, res->ai_addr);

netcat-openbsd.changes

@@ -1,3 +1,68 @@
+-------------------------------------------------------------------
+Wed Jun  4 07:38:37 UTC 2025 - Peter Simons <psimons@suse.com>
+
+- Update netcat to upstream version 1.229.
+  * Fix build failure with GCC-15.
+
+  * In UDP mode, do not test the connection (by writing "XXX" junk)
+    when ‘-z’ is unset and the standard input is not a TTY.
+
+  * rsync: Replace ‘-v’ flag with ‘-P’.
+
+  * udp-scan-timeout.patch: Call connection_info() and udptest()
+    call when ‘-z’ flag is set. This is the upstream behavior.
+
+  * Add support for abstract namespace sockets in the AF_UNIX family.
+
+  * Make getnameinfo(3) errors non-fatal in report_sock():
+    report_sock() is used to show the peer's address/name and port
+    when the '-v' flag is set. Reverse resolution errors need not
+    be fatal.
+
+  * Fix TCP MD5 signature support. The feature now requires the
+    TCP_MD5SIG_EXT socket option, available since Linux 4.13.
+
+  * Make -q0 quit immediately also with UDP sockets.
+
+  * Re-enable specifying client socket for UNIX-domain datagram
+    sockets. Regression introduced in version 1.187.
+
+- Added "abstract-unix-domain-socket.patch": when using '-U' to
+  connect() or bind() to a UNIX domain socket, if the address
+  (path) starts with "@", it is read as an abstract namespace
+  socket.
+
+- Added "make-getnameinfo-errors-nonfatal-in-report_sock.patch":
+  report_sock() is used to show the peer's address/name and port
+  when the ‘-v’ flag is set. Reverse resolution errors need not be
+  fatal.
+
+- Renamed the misspelled "port-to-linux-with-libsd.patch" to
+  "port-to-linux-with-libbsd.patch".
+
+- Refreshed patches:
+  * broadcast-support.patch
+  * build-without-TLS-support.patch
+  * connect-timeout.patch
+  * dccp-support.patch
+  * destination-port-list.patch
+  * enable-udp-ip_recverr.patch
+  * get-sev-by-name.patch
+  * misc-failures-and-features.patch
+  * port-select-on-connect.patch
+  * port-to-linux-with-libbsd.patch
+  * quit-timer.patch
+  * send-crlf.patch
+  * serialized-handling-multiple-clients.patch
+  * set-TCP-MD5SIG-correctly-for-client-connections.patch
+  * udp-scan-timeout.patch
+  * use-flags-to-specify-listen-address.patch
+
+-------------------------------------------------------------------
+Tue Apr  8 13:01:27 UTC 2025 - Friedrich Haubensak <hsk17@mail.de>
+
+- add -std=gnu99 to CFLAGS to fix gcc15 compile time errors
+
 -------------------------------------------------------------------
 Mon Nov 22 10:16:15 UTC 2021 - Peter Simons <psimons@suse.com>
 
@@ -179,4 +244,3 @@ Sat Jul  5 19:30:39 CEST 2008 - crrodriguez@suse.de
 Sun Apr 13 05:08:48 CEST 2008 - crrodriguez@suse.de
 
 - initial version for the OBS
-

netcat-openbsd.spec

@@ -1,7 +1,7 @@
 #
 # spec file for package netcat-openbsd
 #
-# Copyright (c) 2021 SUSE LLC
+# Copyright (c) 2025 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -17,15 +17,15 @@
 
 
 Name:           netcat-openbsd
-Version:        1.203
+Version:        1.229
 Release:        0
 Summary:        TCP/IP swiss army knife
 License:        BSD-3-Clause
 Group:          Productivity/Networking/Other
 URL:            https://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/nc/
-Source0:        http://old.kali.org/kali/pool/main/n/netcat-openbsd/netcat-openbsd_%{version}.orig.tar.gz
-#Patches from: http://http.debian.net/debian/pool/main/n/netcat-openbsd/netcat-openbsd_%{version}-2.debian.tar.xz
-Patch0:         port-to-linux-with-libsd.patch
+Source0:        http://deb.debian.org/debian/pool/main/n/netcat-openbsd/netcat-openbsd_%{version}.orig.tar.gz
+# Debian patches from: http://http.debian.net/debian/pool/main/n/netcat-openbsd/netcat-openbsd_%{version}-2.debian.tar.xz
+Patch0:         port-to-linux-with-libbsd.patch
 Patch1:         build-without-TLS-support.patch
 Patch2:         connect-timeout.patch
 Patch3:         get-sev-by-name.patch
@@ -38,9 +38,12 @@ Patch9:         serialized-handling-multiple-clients.patch
 Patch10:        set-TCP-MD5SIG-correctly-for-client-connections.patch
 Patch11:        destination-port-list.patch
 Patch12:        use-flags-to-specify-listen-address.patch
-Patch13:        misc-failures-and-features.patch
-Patch14:        port-select-on-connect.patch
-Patch15:        enable-udp-ip_recverr.patch
+Patch13:        make-getnameinfo-errors-nonfatal-in-report_sock.patch
+Patch14:        abstract-unix-domain-socket.patch
+Patch15:        misc-failures-and-features.patch
+# SUSE patches
+Patch20:        port-select-on-connect.patch
+Patch21:        enable-udp-ip_recverr.patch
 BuildRequires:  pkgconfig
 BuildRequires:  pkgconfig(libbsd)
 Provides:       nc6 = %{version}
@@ -61,8 +64,7 @@ This package contains the OpenBSD rewrite of netcat, including support
 for IPv6, proxies, and Unix sockets.
 
 %prep
-%setup -q
-%autopatch -p1
+%autosetup -p1
 
 %build
 make %{?_smp_mflags} \

port-select-on-connect.patch

@@ -1,8 +1,8 @@
-Index: netcat-openbsd-1.203/netcat.c
+Index: netcat-openbsd-1.229/netcat.c
 ===================================================================
---- netcat-openbsd-1.203.orig/netcat.c
-+++ netcat-openbsd-1.203/netcat.c
-@@ -1190,7 +1190,10 @@ remote_connect(const char *host, const c
+--- netcat-openbsd-1.229.orig/netcat.c	2025-06-04 07:36:38.214088834 +0000
++++ netcat-openbsd-1.229/netcat.c	2025-06-04 07:36:53.985608901 +0000
+@@ -1228,7 +1228,10 @@ remote_connect(const char *host, const c
  			ahints.ai_flags = AI_PASSIVE;
  			if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
  				errx(1, "getaddrinfo: %s", gai_strerror(error));
@@ -12,5 +12,5 @@ Index: netcat-openbsd-1.203/netcat.c
 +				setsockopt(s, SOL_IP, IP_BIND_ADDRESS_NO_PORT, &on, sizeof(on));
 +#endif
  			if (bind(s, (struct sockaddr *)ares->ai_addr,
- 			    ares->ai_addrlen) < 0)
+ 			    ares->ai_addrlen) == -1)
  				err(1, "bind failed");

port-to-linux-with-libbsd.patch

@@ -1,38 +1,44 @@
 From: Aron Xu <aron@debian.org>
 Date: Mon, 13 Feb 2012 15:59:31 +0800
-Subject: port to linux with libsd
+Subject: Port to linux with libbsd
 
+Forwarded: not-needed
 ---
- Makefile |   15 ++++++-
- nc.1     |    3 -
- netcat.c |  131 ++++++++++++++++++++++++++++++++++++++++++++++++---------------
- socks.c  |   46 +++++++++++-----------
- 4 files changed, 139 insertions(+), 56 deletions(-)
+ Makefile |  16 +++++++-
+ nc.1     |   3 +-
+ netcat.c | 135 ++++++++++++++++++++++++++++++++++++++++++++++-----------------
+ socks.c  |  48 +++++++++++------------
+ 4 files changed, 139 insertions(+), 63 deletions(-)
 
+diff --git a/Makefile b/Makefile
+index 5f20c40..93ca5ee 100644
 --- a/Makefile
 +++ b/Makefile
-@@ -5,4 +5,17 @@ SRCS=	netcat.c atomicio.c socks.c
+@@ -5,4 +5,18 @@ SRCS=	netcat.c atomicio.c socks.c
  LDADD+= -ltls -lssl -lcrypto
  DPADD+=  ${LIBTLS} ${LIBSSL} ${LIBCRYPTO}
  
 -.include <bsd.prog.mk>
-+LIBS=  `pkg-config --libs libbsd` -lresolv
++PKG_CONFIG ?= pkg-config
++LIBS=  `$(PKG_CONFIG) --libs libbsd` -lresolv
 +OBJS=  $(SRCS:.c=.o)
 +CFLAGS=  -g -O2
 +LDFLAGS=  -Wl,--no-add-needed
 +
 +all: nc
 +nc: $(OBJS)
-+	$(CC) $(CFLAGS) $(LDFLAGS) $(OBJS) $(LIBS) -o nc
++	$(CC) $(CFLAGS) $(LDFLAGS) $^ $(LIBS) -o $@
 +
 +$(OBJS): %.o: %.c
 +	$(CC) $(CFLAGS) -c $< -o $@
 +
 +clean:
 +	rm -f $(OBJS) nc
+diff --git a/nc.1 b/nc.1
+index 76b6dc0..596bd8e 100644
 --- a/nc.1
 +++ b/nc.1
-@@ -213,8 +213,6 @@ Proxy authentication is only supported f
+@@ -213,8 +213,6 @@ Proxy authentication is only supported for HTTP CONNECT proxies at present.
  Specify the source port
  .Nm
  should use, subject to privilege restrictions and availability.
@@ -41,7 +47,7 @@ Subject: port to linux with libsd
  .It Fl R Ar CAfile
  Load the root CA bundle for TLS certificate verification from
  .Ar CAfile ,
-@@ -274,6 +272,7 @@ For the IPv4 TOS/IPv6 traffic class valu
+@@ -273,6 +271,7 @@ For the IPv4 TOS/IPv6 traffic class value,
  may be one of
  .Cm critical ,
  .Cm inetcontrol ,
@@ -49,6 +55,8 @@ Subject: port to linux with libsd
  .Cm lowdelay ,
  .Cm netcontrol ,
  .Cm throughput ,
+diff --git a/netcat.c b/netcat.c
+index 8c60fd1..d23e566 100644
 --- a/netcat.c
 +++ b/netcat.c
 @@ -32,6 +32,8 @@
@@ -123,14 +131,14 @@ Subject: port to linux with libsd
  			uflag = 1;
  			break;
  		case 'V':
-+# if defined(RT_TABLEID_MAX)
++#ifdef RT_TABLEID_MAX
  			rtableid = (int)strtonum(optarg, 0,
  			    RT_TABLEID_MAX, &errstr);
  			if (errstr)
  				errx(1, "rtable %s: %s", errstr, optarg);
-+# else
++#else
 +			errx(1, "no alternate routing table support available");
-+# endif
++#endif
  			break;
  		case 'v':
  			vflag = 1;
@@ -138,39 +146,38 @@ Subject: port to linux with libsd
  			oflag = optarg;
  			break;
  		case 'S':
-+# if defined(TCP_MD5SIG)
++#ifdef TCP_MD5SIG
  			Sflag = 1;
-+# else
++#else
 +			errx(1, "no TCP MD5 signature support available");
-+# endif
++#endif
  			break;
  		case 'T':
  			errstr = NULL;
-@@ -346,14 +401,23 @@ main(int argc, char *argv[])
+@@ -346,13 +401,22 @@ main(int argc, char *argv[])
  	argc -= optind;
  	argv += optind;
  
-+# if defined(RT_TABLEID_MAX)
++#ifdef RT_TABLEID_MAX
  	if (rtableid >= 0)
  		if (setrtable(rtableid) == -1)
  			err(1, "setrtable");
-+# endif
++#endif
  
  	/* Cruft to make sure options are clean, and used properly. */
- 	if (argv[0] && !argv[1] && family == AF_UNIX) {
+ 	if (argc == 1 && family == AF_UNIX) {
  		host = argv[0];
- 		uport = NULL;
-+	} else if (!argv[0] && lflag) {
++	} else if (argc == 0 && lflag) {
 +		if (sflag)
 +			errx(1, "cannot use -s and -l");
 +		if (pflag)
 +			errx(1, "cannot use -p and -l");
 +		if (zflag)
 +			errx(1, "cannot use -z and -l");
- 	} else if (argv[0] && !argv[1]) {
- 		if (!lflag)
- 			usage(1);
-@@ -388,33 +452,6 @@ main(int argc, char *argv[])
+ 	} else if (argc == 1 && lflag) {
+ 		uport = argv[0];
+ 	} else if (argc == 2) {
+@@ -396,33 +460,6 @@ main(int argc, char *argv[])
  		}
  	}
  
@@ -204,63 +211,74 @@ Subject: port to linux with libsd
  	if (!lflag && kflag)
  		errx(1, "must use -l with -k");
  	if (uflag && usetls)
-@@ -449,8 +486,8 @@ main(int argc, char *argv[])
- 		} else {
- 			strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
- 			    UNIX_DG_TMP_SOCKET_SIZE);
--			if (mktemp(unix_dg_tmp_socket_buf) == NULL)
--				err(1, "mktemp");
-+			if (mkstemp(unix_dg_tmp_socket_buf) == -1)
-+				err(1, "mkstemp");
- 			unix_dg_tmp_socket = unix_dg_tmp_socket_buf;
- 		}
- 	}
-@@ -933,8 +970,10 @@ remote_connect(const char *host, const c
+@@ -579,10 +616,6 @@ main(int argc, char *argv[])
+ 			if (s == -1)
+ 				err(1, NULL);
+ 			if (uflag && kflag) {
+-				if (family == AF_UNIX) {
+-					if (pledge("stdio unix", NULL) == -1)
+-						err(1, "pledge");
+-				}
+ 				/*
+ 				 * For UDP and -k, don't connect the socket,
+ 				 * let it receive datagrams from multiple
+@@ -609,10 +642,6 @@ main(int argc, char *argv[])
+ 				if (rv == -1)
+ 					err(1, "connect");
+ 
+-				if (family == AF_UNIX) {
+-					if (pledge("stdio unix", NULL) == -1)
+-						err(1, "pledge");
+-				}
+ 				if (vflag)
+ 					report_sock("Connection received",
+ 					    (struct sockaddr *)&z, len,
+@@ -938,8 +967,10 @@ remote_connect(const char *host, const char *port, struct addrinfo hints,
  		if (sflag || pflag) {
  			struct addrinfo ahints, *ares;
  
-+# if defined (SO_BINDANY)
++#ifdef SO_BINDANY
  			/* try SO_BINDANY, but don't insist */
  			setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
-+# endif
++#endif
  			memset(&ahints, 0, sizeof(struct addrinfo));
  			ahints.ai_family = res->ai_family;
  			ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
-@@ -1026,9 +1065,15 @@ local_listen(const char *host, const cha
- 		    res->ai_protocol)) < 0)
+@@ -1052,9 +1083,15 @@ local_listen(const char *host, const char *port, struct addrinfo hints)
+ 		    res->ai_protocol)) == -1)
  			continue;
  
 +		ret = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &x, sizeof(x));
 +		if (ret == -1)
 +			err(1, NULL);
 +
-+# if defined(SO_REUSEPORT)
++#ifdef SO_REUSEPORT
  		ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
  		if (ret == -1)
  			err(1, NULL);
-+# endif
++#endif
  
  		set_common_sockopts(s, res->ai_family);
  
-@@ -1498,11 +1543,13 @@ set_common_sockopts(int s, int af)
+@@ -1559,11 +1596,13 @@ set_common_sockopts(int s, int af)
  {
  	int x = 1;
  
-+# if defined(TCP_MD5SIG)
++#ifdef TCP_MD5SIG
  	if (Sflag) {
  		if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
  		    &x, sizeof(x)) == -1)
  			err(1, NULL);
  	}
-+# endif
++#endif
  	if (Dflag) {
  		if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
  		    &x, sizeof(x)) == -1)
-@@ -1513,9 +1560,14 @@ set_common_sockopts(int s, int af)
+@@ -1574,9 +1613,14 @@ set_common_sockopts(int s, int af)
  		    IP_TOS, &Tflag, sizeof(Tflag)) == -1)
  			err(1, "set IP ToS");
  
-+#if defined(IPV6_TCLASS)
++#ifdef IPV6_TCLASS
  		else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
  		    IPV6_TCLASS, &Tflag, sizeof(Tflag)) == -1)
  			err(1, "set IPv6 traffic class");
@@ -271,11 +289,11 @@ Subject: port to linux with libsd
  	}
  	if (Iflag) {
  		if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
-@@ -1533,19 +1585,34 @@ set_common_sockopts(int s, int af)
+@@ -1594,19 +1638,34 @@ set_common_sockopts(int s, int af)
  		    IP_TTL, &ttl, sizeof(ttl)))
  			err(1, "set IP TTL");
  
-+#if defined(IPV6_UNICAST_HOPS)
++#ifdef IPV6_UNICAST_HOPS
  		else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
  		    IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)))
  			err(1, "set IPv6 unicast hops");
@@ -286,7 +304,7 @@ Subject: port to linux with libsd
  	}
  
  	if (minttl != -1) {
-+#if defined(IP_MINTTL)
++#ifdef IP_MINTTL
  		if (af == AF_INET && setsockopt(s, IPPROTO_IP,
  		    IP_MINTTL, &minttl, sizeof(minttl)))
  			err(1, "set IP min TTL");
@@ -295,7 +313,7 @@ Subject: port to linux with libsd
 +			errx(1, "can't set IP min TTL (unavailable)");
 +#endif
  
-+#if defined(IPV6_MINHOPCOUNT)
++#ifdef IPV6_MINHOPCOUNT
  		else if (af == AF_INET6 && setsockopt(s, IPPROTO_IPV6,
  		    IPV6_MINHOPCOUNT, &minttl, sizeof(minttl)))
  			err(1, "set IPv6 min hop count");
@@ -306,7 +324,7 @@ Subject: port to linux with libsd
  	}
  }
  
-@@ -1580,6 +1647,7 @@ process_tos_opt(char *s, int *val)
+@@ -1641,6 +1700,7 @@ process_tos_opt(char *s, int *val)
  		{ "cs7",		IPTOS_DSCP_CS7 },
  		{ "ef",			IPTOS_DSCP_EF },
  		{ "inetcontrol",	IPTOS_PREC_INTERNETCONTROL },
@@ -314,17 +332,17 @@ Subject: port to linux with libsd
  		{ "lowdelay",		IPTOS_LOWDELAY },
  		{ "netcontrol",		IPTOS_PREC_NETCONTROL },
  		{ "reliability",	IPTOS_RELIABILITY },
-@@ -1741,6 +1809,9 @@ report_sock(const char *msg, const struc
+@@ -1805,6 +1865,9 @@ report_sock(const char *msg, const struct sockaddr *sa, socklen_t salen,
  void
  help(void)
  {
-+# if defined(DEBIAN_VERSION)
++#ifdef DEBIAN_VERSION
 +	fprintf(stderr, "OpenBSD netcat (Debian patchlevel " DEBIAN_VERSION ")\n");
-+# endif
++#endif
  	usage(0);
  	fprintf(stderr, "\tCommand Summary:\n\
  	\t-4		Use IPv4\n\
-@@ -1783,7 +1854,7 @@ help(void)
+@@ -1847,7 +1910,7 @@ help(void)
  	\t-Z		Peer certificate file\n\
  	\t-z		Zero-I/O mode [used for scanning]\n\
  	Port numbers can be individual or ranges: lo-hi [inclusive]\n");
@@ -333,6 +351,8 @@ Subject: port to linux with libsd
  }
  
  void
+diff --git a/socks.c b/socks.c
+index 7c7448c..8db10d4 100644
 --- a/socks.c
 +++ b/socks.c
 @@ -38,7 +38,7 @@
@@ -344,7 +364,7 @@ Subject: port to linux with libsd
  #include "atomicio.h"
  
  #define SOCKS_PORT	"1080"
-@@ -217,11 +217,11 @@ socks_connect(const char *host, const ch
+@@ -217,11 +217,11 @@ socks_connect(const char *host, const char *port,
  		buf[2] = SOCKS_NOAUTH;
  		cnt = atomicio(vwrite, proxyfd, buf, 3);
  		if (cnt != 3)
@@ -358,7 +378,7 @@ Subject: port to linux with libsd
  
  		if (buf[1] == SOCKS_NOMETHOD)
  			errx(1, "authentication method negotiation failed");
-@@ -270,11 +270,11 @@ socks_connect(const char *host, const ch
+@@ -270,11 +270,11 @@ socks_connect(const char *host, const char *port,
  
  		cnt = atomicio(vwrite, proxyfd, buf, wlen);
  		if (cnt != wlen)
@@ -372,7 +392,7 @@ Subject: port to linux with libsd
  		if (buf[1] != 0) {
  			errx(1, "connection failed, SOCKSv5 error: %s",
  			    socks5_strerror(buf[1]));
-@@ -283,12 +283,12 @@ socks_connect(const char *host, const ch
+@@ -283,12 +283,12 @@ socks_connect(const char *host, const char *port,
  		case SOCKS_IPV4:
  			cnt = atomicio(read, proxyfd, buf + 4, 6);
  			if (cnt != 6)
@@ -387,7 +407,7 @@ Subject: port to linux with libsd
  			break;
  		default:
  			errx(1, "connection failed, unsupported address type");
-@@ -308,11 +308,11 @@ socks_connect(const char *host, const ch
+@@ -308,11 +308,11 @@ socks_connect(const char *host, const char *port,
  
  		cnt = atomicio(vwrite, proxyfd, buf, wlen);
  		if (cnt != wlen)
@@ -401,7 +421,7 @@ Subject: port to linux with libsd
  		if (buf[1] != 90) {
  			errx(1, "connection failed, SOCKSv4 error: %s",
  			    socks4_strerror(buf[1]));
-@@ -326,21 +326,21 @@ socks_connect(const char *host, const ch
+@@ -326,21 +326,21 @@ socks_connect(const char *host, const char *port,
  
  		/* Try to be sane about numeric IPv6 addresses */
  		if (strchr(host, ':') != NULL) {
@@ -415,7 +435,7 @@ Subject: port to linux with libsd
  			    "CONNECT %s:%d HTTP/1.0\r\n",
  			    host, ntohs(serverport));
  		}
- 		if (r == -1 || (size_t)r >= sizeof(buf))
+ 		if (r < 0 || (size_t)r >= sizeof(buf))
  			errx(1, "hostname too long");
 -		r = strlen(buf);
 +		r = strlen((char*)buf);
@@ -427,7 +447,7 @@ Subject: port to linux with libsd
  
  		if (authretry > 1) {
  			char proxypass[256];
-@@ -348,20 +348,20 @@ socks_connect(const char *host, const ch
+@@ -348,20 +348,20 @@ socks_connect(const char *host, const char *port,
  
  			getproxypass(proxyuser, proxyhost,
  			    proxypass, sizeof proxypass);
@@ -443,7 +463,7 @@ Subject: port to linux with libsd
 -			r = snprintf(buf, sizeof(buf), "Proxy-Authorization: "
 +			r = snprintf((char*)buf, sizeof(buf), "Proxy-Authorization: "
  			    "Basic %s\r\n", resp);
- 			if (r == -1 || (size_t)r >= sizeof(buf))
+ 			if (r < 0 || (size_t)r >= sizeof(buf))
  				errx(1, "Proxy auth response too long");
 -			r = strlen(buf);
 +			r = strlen((char*)buf);
@@ -453,15 +473,17 @@ Subject: port to linux with libsd
  			explicit_bzero(proxypass, sizeof proxypass);
  			explicit_bzero(buf, sizeof buf);
  		}
-@@ -371,22 +371,22 @@ socks_connect(const char *host, const ch
+@@ -371,23 +371,23 @@ socks_connect(const char *host, const char *port,
  			err(1, "write failed (%zu/2)", cnt);
  
  		/* Read status reply */
 -		proxy_read_line(proxyfd, buf, sizeof(buf));
 +		proxy_read_line(proxyfd, (char*)buf, sizeof(buf));
  		if (proxyuser != NULL &&
--		    strncmp(buf, "HTTP/1.0 407 ", 12) == 0) {
-+		    strncmp((char*)buf, "HTTP/1.0 407 ", 12) == 0) {
+-		    (strncmp(buf, "HTTP/1.0 407 ", 12) == 0 ||
+-		    strncmp(buf, "HTTP/1.1 407 ", 12) == 0)) {
++		    (strncmp((char*)buf, "HTTP/1.0 407 ", 12) == 0 ||
++		    strncmp((char*)buf, "HTTP/1.1 407 ", 12) == 0)) {
  			if (authretry > 1) {
  				fprintf(stderr, "Proxy authentication "
  				    "failed\n");

quit-timer.patch

@@ -1,12 +1,14 @@
 From: Aron Xu <aron@debian.org>
 Date: Mon, 13 Feb 2012 15:16:04 +0800
-Subject: quit timer
+Subject: New flag '-q' to specify a quit timer
 
 ---
  nc.1     | 10 ++++++++++
- netcat.c |   50 +++++++++++++++++++++++++++++++++++++++++---------
- 2 files changed, 51 insertions(+), 9 deletions(-)
+ netcat.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++-----------
+ 2 files changed, 58 insertions(+), 11 deletions(-)
 
+diff --git a/nc.1 b/nc.1
+index 478fedd..fbcc098 100644
 --- a/nc.1
 +++ b/nc.1
 @@ -41,6 +41,7 @@
@@ -14,10 +16,10 @@ Subject: quit timer
  .Op Fl P Ar proxy_username
  .Op Fl p Ar source_port
 +.Op Fl q Ar seconds
- .Op Fl s Ar source
+ .Op Fl s Ar sourceaddr
  .Op Fl T Ar keyword
  .Op Fl V Ar rtable
-@@ -167,6 +168,15 @@ Proxy authentication is only supported f
+@@ -167,6 +168,15 @@ Proxy authentication is only supported for HTTP CONNECT proxies at present.
  Specify the source port
  .Nm
  should use, subject to privilege restrictions and availability.
@@ -33,9 +35,11 @@ Subject: quit timer
  .It Fl r
  Choose source and/or destination ports randomly
  instead of sequentially within a range or in the order that the system
+diff --git a/netcat.c b/netcat.c
+index 2f3e9a8..03d339c 100644
 --- a/netcat.c
 +++ b/netcat.c
-@@ -139,6 +139,7 @@ int	Nflag;					/* shutdown() network soc
+@@ -139,6 +139,7 @@ int	Nflag;					/* shutdown() network socket */
  int	nflag;					/* Don't do name look up */
  char   *Pflag;					/* Proxy username */
  char   *pflag;					/* Localport flag */
@@ -43,28 +47,27 @@ Subject: quit timer
  int	rflag;					/* Random ports flag */
  char   *sflag;					/* Source Address */
  int	tflag;					/* Telnet Emulation */
-@@ -224,6 +225,8 @@ ssize_t fillbuf(int, unsigned char *, si
- static int connect_with_timeout(int fd, const struct sockaddr *sa,
-         socklen_t salen, int ctimeout);
+@@ -223,6 +224,7 @@ ssize_t fillbuf(int, unsigned char *, size_t *);
+ #endif
+ 
+ static int connect_with_timeout(int, const struct sockaddr *, socklen_t, int);
++static void quit(int sig);
  
-+static void quit();
-+
  int
  main(int argc, char *argv[])
- {
-@@ -256,9 +259,9 @@ main(int argc, char *argv[])
+@@ -255,9 +257,9 @@ main(int argc, char *argv[])
  
  	while ((ch = getopt(argc, argv,
- # if defined(TLS)
+ #ifdef HAVE_TLS
 -	    "46C:cDde:FH:hI:i:K:klM:m:NnO:o:P:p:R:rSs:T:tUuV:vW:w:X:x:Z:z"))
 +	    "46C:cDde:FH:hI:i:K:klM:m:NnO:o:P:p:q:R:rSs:T:tUuV:vW:w:X:x:Z:z"))
- # else
+ #else
 -	    "46CDdFhI:i:klM:m:NnO:P:p:rSs:T:tUuV:vW:w:X:x:z"))
 +	    "46CDdFhI:i:klM:m:NnO:P:p:q:rSs:T:tUuV:vW:w:X:x:z"))
- # endif
+ #endif
  	    != -1) {
  		switch (ch) {
-@@ -350,6 +353,13 @@ main(int argc, char *argv[])
+@@ -349,6 +351,13 @@ main(int argc, char *argv[])
  		case 'p':
  			pflag = optarg;
  			break;
@@ -75,10 +78,10 @@ Subject: quit timer
 +			if (qflag >= 0)
 +				Nflag = 1;
 +			break;
- # if defined(TLS)
+ #ifdef HAVE_TLS
  		case 'R':
  			tls_cachanged = 1;
-@@ -1319,15 +1329,27 @@ readwrite(int net_fd)
+@@ -1335,15 +1344,27 @@ readwrite(int net_fd)
  	while (1) {
  		/* both inputs are gone, buffers are empty, we are done */
  		if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1 &&
@@ -112,22 +115,37 @@ Subject: quit timer
  
  		/* poll */
  		num_fds = poll(pfd, 4, timeout);
-@@ -2052,6 +2074,7 @@ help(void)
+@@ -1500,6 +1521,13 @@ readwrite(int net_fd)
+ 			if (pfd[POLL_NETOUT].fd != -1 && Nflag)
+ 				shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
+ 			pfd[POLL_NETOUT].fd = -1;
++			/* #817050: handle UDP sockets and kflag */
++			if ((lflag || uflag) && pfd[POLL_NETIN].fd != -1 &&
++			    qflag >= 0 && netinbufpos == 0) {
++				shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
++				pfd[POLL_NETIN].fd = -1;
++				kflag = 0;
++			}
+ 		}
+ 		/* net in gone and queue empty? */
+ 		if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) {
+@@ -2106,6 +2134,7 @@ help(void)
  	\t-O length	TCP send buffer length\n\
  	\t-P proxyuser\tUsername for proxy authentication\n\
  	\t-p port\t	Specify local port for remote connects\n\
 +	\t-q secs\t	quit after EOF on stdin and delay of secs\n\
  	\t-r		Randomize remote ports\n\
  	\t-S		Enable the TCP MD5 signature option\n\
- 	\t-s source	Local source address\n\
-@@ -2076,10 +2099,19 @@ usage(int ret)
+ 	\t-s sourceaddr	Local source address\n\
+@@ -2130,10 +2159,18 @@ usage(int ret)
  	fprintf(stderr,
  	    "usage: nc [-46CDdFhklNnrStUuvz] [-I length] [-i interval] [-M ttl]\n"
  	    "\t  [-m minttl] [-O length] [-P proxy_username] [-p source_port]\n"
--	    "\t  [-s source] [-T keyword] [-V rtable] [-W recvlimit] "
-+	    "\t  [-q seconds] [-s source] [-T keyword] [-V rtable] [-W recvlimit] "
- 	    "[-w timeout]\n"
- 	    "\t  [-X proxy_protocol] [-x proxy_address[:port]] "
+-	    "\t  [-s sourceaddr] [-T keyword] [-V rtable] [-W recvlimit] "
+-	    "[-w timeout]\n"
+-	    "\t  [-X proxy_protocol] [-x proxy_address[:port]]\n"
++	    "\t  [-q seconds] [-s sourceaddr] [-T keyword] [-V rtable] [-W recvlimit]\n"
++	    "\t  [-w timeout] [-X proxy_protocol] [-x proxy_address[:port]]\n"
  	    "\t  [destination] [port]\n");
  	if (ret)
  		exit(1);
@@ -137,7 +155,7 @@ Subject: quit timer
 + * quit()
 + * handler for a "-q" timeout (exit 0 instead of 1)
 + */
-+static void quit()
++static void quit(__attribute__((unused)) int sig)
 +{
 +	exit(0);
 +}

send-crlf.patch

@@ -1,12 +1,14 @@
 From: Aron Xu <aron@debian.org>
 Date: Mon, 13 Feb 2012 14:57:45 +0800
-Subject: send crlf
+Subject: New flag '-C' to translate terminal line feeds to CRLF
 
 ---
- nc.1     |    9 +++++--
- netcat.c |   74 ++++++++++++++++++++++++++++++++++-----------------------------
- 2 files changed, 48 insertions(+), 35 deletions(-)
+ nc.1     |  9 ++++++--
+ netcat.c | 72 +++++++++++++++++++++++++++++++++++-----------------------------
+ 2 files changed, 47 insertions(+), 34 deletions(-)
 
+diff --git a/nc.1 b/nc.1
+index 2eb732e..478fedd 100644
 --- a/nc.1
 +++ b/nc.1
 @@ -33,7 +33,7 @@
@@ -30,56 +32,58 @@ Subject: send crlf
  .It Fl D
  Enable debugging on the socket.
  .It Fl d
-@@ -377,7 +382,7 @@ More complicated examples can be built u
+@@ -380,7 +385,7 @@ More complicated examples can be built up when the user knows the format
  of requests required by the server.
  As another example, an email may be submitted to an SMTP server using:
  .Bd -literal -offset indent
--$ nc localhost 25 \*(Lt\*(Lt EOF
-+$ nc [\-C] localhost 25 \*(Lt\*(Lt EOF
+-$ nc localhost 25 << EOF
++$ nc [\-C] localhost 25 << EOF
  HELO host.example.com
- MAIL FROM:\*(Ltuser@host.example.com\*(Gt
- RCPT TO:\*(Ltuser2@host.example.com\*(Gt
+ MAIL FROM:<user@host.example.com>
+ RCPT TO:<user2@host.example.com>
+diff --git a/netcat.c b/netcat.c
+index 2dc1abd..2f3e9a8 100644
 --- a/netcat.c
 +++ b/netcat.c
-@@ -166,6 +166,8 @@ char	*tls_expecthash;			/* required hash
+@@ -166,6 +166,8 @@ char	*tls_expecthash;			/* required hash of peer cert */
  char	*tls_ciphers;				/* TLS ciphers */
  char	*tls_protocols;				/* TLS protocols */
  FILE	*Zflag;					/* file to save peer cert */
-+# else
++#else
 +int	Cflag = 0;			/* CRLF line-ending */
- # endif
+ #endif
  
  int recvcount, recvlimit;
-@@ -215,7 +217,7 @@ ssize_t fillbuf(int, unsigned char *, si
+@@ -216,7 +218,7 @@ ssize_t fillbuf(int, unsigned char *, size_t *, struct tls *);
  void	tls_setup_client(struct tls *, int, char *);
  struct tls *tls_setup_server(struct tls *, int, char *);
- # else
+ #else
 -ssize_t drainbuf(int, unsigned char *, size_t *);
 +ssize_t drainbuf(int, unsigned char *, size_t *, int);
  ssize_t fillbuf(int, unsigned char *, size_t *);
- # endif
+ #endif
  
-@@ -256,7 +258,7 @@ main(int argc, char *argv[])
- # if defined(TLS)
+@@ -255,7 +257,7 @@ main(int argc, char *argv[])
+ #ifdef HAVE_TLS
  	    "46C:cDde:FH:hI:i:K:klM:m:NnO:o:P:p:R:rSs:T:tUuV:vW:w:X:x:Z:z"))
- # else
+ #else
 -	    "46DdFhI:i:klM:m:NnO:P:p:rSs:T:tUuV:vW:w:X:x:z"))
 +	    "46CDdFhI:i:klM:m:NnO:P:p:rSs:T:tUuV:vW:w:X:x:z"))
- # endif
+ #endif
  	    != -1) {
  		switch (ch) {
-@@ -286,6 +288,10 @@ main(int argc, char *argv[])
+@@ -285,6 +287,10 @@ main(int argc, char *argv[])
  		case 'c':
  			usetls = 1;
  			break;
-+# else
++#else
 +		case 'C':
 +			Cflag = 1;
 +			break;
- # endif
+ #endif
  		case 'd':
  			dflag = 1;
-@@ -1323,12 +1329,6 @@ readwrite(int net_fd)
+@@ -1339,12 +1345,6 @@ readwrite(int net_fd)
  		    stdinbufpos == 0 && netinbufpos == 0)
  			return;
  
@@ -92,33 +96,33 @@ Subject: send crlf
  		/* poll */
  		num_fds = poll(pfd, 4, timeout);
  
-@@ -1408,7 +1408,7 @@ readwrite(int net_fd)
+@@ -1424,7 +1424,7 @@ readwrite(int net_fd)
  				pfd[POLL_NETOUT].events = POLLOUT;
  			else
- # else
+ #else
 -			    &stdinbufpos);
 +			    &stdinbufpos, (iflag || Cflag) ? 1 : 0);
- # endif
+ #endif
  			if (ret == -1)
  				pfd[POLL_NETOUT].fd = -1;
-@@ -1467,7 +1467,7 @@ readwrite(int net_fd)
+@@ -1483,7 +1483,7 @@ readwrite(int net_fd)
  				pfd[POLL_STDOUT].events = POLLOUT;
  			else
- # else
+ #else
 -			    &netinbufpos);
 +			    &netinbufpos, 0);
- # endif
+ #endif
  			if (ret == -1)
  				pfd[POLL_STDOUT].fd = -1;
-@@ -1493,33 +1493,40 @@ readwrite(int net_fd)
+@@ -1509,36 +1509,43 @@ readwrite(int net_fd)
  }
  
  ssize_t
--# if defined(TLS)
+-#ifdef HAVE_TLS
 -drainbuf(int fd, unsigned char *buf, size_t *bufpos, struct tls *tls)
--# else
+-#else
 -drainbuf(int fd, unsigned char *buf, size_t *bufpos)
--# endif
+-#endif
 +drainbuf(int fd, unsigned char *buf, size_t *bufpos, int oneline)
  {
 -	ssize_t n;
@@ -126,28 +130,30 @@ Subject: send crlf
  	ssize_t adjust;
 +	unsigned char *lf = NULL;
  
--# if defined(TLS)
+ 	if (fd == -1)
+ 		return -1;
+ 
+-#ifdef HAVE_TLS
 -	if (tls) {
 -		n = tls_write(tls, buf, *bufpos);
 -		if (n == -1)
 -			errx(1, "tls write failed (%s)", tls_error(tls));
 -	} else {
--# endif
+-#endif
 -		n = write(fd, buf, *bufpos);
 -		/* don't treat EAGAIN, EINTR as error */
 -		if (n == -1 && (errno == EAGAIN || errno == EINTR))
--# if defined(TLS)
+-#ifdef HAVE_TLS
 -			n = TLS_WANT_POLLOUT;
--	}
--# else
--			n = -2;
--# endif
 +	if (oneline)
 +		lf = memchr(buf, '\n', *bufpos);
 +	if (lf == NULL) {
 +		n = *bufpos;
 +		oneline = 0;
-+	}
+ 	}
+-#else
+-			n = -2;
+-#endif
 +	else if (Cflag && (lf == buf || buf[lf - buf - 1] != '\r')) {
 +		n = lf - buf;
 +		oneline = 2;
@@ -173,7 +179,7 @@ Subject: send crlf
  	/* adjust buffer */
  	adjust = *bufpos - n;
  	if (adjust > 0)
-@@ -2029,6 +2036,7 @@ help(void)
+@@ -2083,6 +2090,7 @@ help(void)
  	fprintf(stderr, "\tCommand Summary:\n\
  	\t-4		Use IPv4\n\
  	\t-6		Use IPv6\n\
@@ -181,12 +187,12 @@ Subject: send crlf
  	\t-D		Enable the debug socket option\n\
  	\t-d		Detach from stdin\n\
  	\t-F		Pass socket fd\n\
-@@ -2066,7 +2074,7 @@ void
+@@ -2120,7 +2128,7 @@ void
  usage(int ret)
  {
  	fprintf(stderr,
 -	    "usage: nc [-46DdFhklNnrStUuvz] [-I length] [-i interval] [-M ttl]\n"
 +	    "usage: nc [-46CDdFhklNnrStUuvz] [-I length] [-i interval] [-M ttl]\n"
  	    "\t  [-m minttl] [-O length] [-P proxy_username] [-p source_port]\n"
- 	    "\t  [-s source] [-T keyword] [-V rtable] [-W recvlimit] "
+ 	    "\t  [-s sourceaddr] [-T keyword] [-V rtable] [-W recvlimit] "
  	    "[-w timeout]\n"

serialized-handling-multiple-clients.patch

@@ -1,14 +1,16 @@
 From: Aron Xu <aron@debian.org>
 Date: Tue, 14 Feb 2012 23:02:00 +0800
-Subject: serialized handling multiple clients
+Subject: Serialized handling of multiple clients
 
 ---
  netcat.c | 17 ++++++++---------
  1 file changed, 8 insertions(+), 9 deletions(-)
 
+diff --git a/netcat.c b/netcat.c
+index 99747a2..8291173 100644
 --- a/netcat.c
 +++ b/netcat.c
-@@ -707,7 +707,10 @@ main(int argc, char *argv[])
+@@ -713,7 +713,10 @@ main(int argc, char *argv[])
  				s = unix_bind(host, 0);
  			else
  				s = unix_listen(host);
@@ -18,10 +20,10 @@ Subject: serialized handling multiple clients
 +		if (s < 0)
 +			err(1, NULL);
  
- # if defined(TLS)
+ #ifdef HAVE_TLS
  		if (usetls) {
-@@ -721,13 +724,6 @@ main(int argc, char *argv[])
- # endif
+@@ -727,13 +730,6 @@ main(int argc, char *argv[])
+ #endif
  		/* Allow only one connection at a time, but stay alive. */
  		for (;;) {
 -			if (family != AF_UNIX) {
@@ -29,13 +31,13 @@ Subject: serialized handling multiple clients
 -					close(s);
 -				s = local_listen(host, uport, hints);
 -			}
--			if (s < 0)
+-			if (s == -1)
 -				err(1, NULL);
  			if (uflag && kflag) {
  				/*
  				 * For UDP and -k, don't connect the socket,
-@@ -804,8 +800,11 @@ main(int argc, char *argv[])
- 					err(1, "connect");
+@@ -807,8 +803,11 @@ main(int argc, char *argv[])
+ #endif
  			}
  
 -			if (!kflag)

set-TCP-MD5SIG-correctly-for-client-connections.patch

@@ -1,73 +1,75 @@
 From: Thomas Habets <habets@google.com>
 Date: Sat, 18 Feb 2017 21:07:22 +0000
-Subject: Set TCP MD5SIG correctly for client connections
+Subject: Fix TCP MD5SIG for client connections
 
 ---
- netcat.c |   31 ++++++++++++++++++++++++-------
- 1 file changed, 24 insertions(+), 7 deletions(-)
+ netcat.c | 34 ++++++++++++++++++++++++++--------
+ 1 file changed, 26 insertions(+), 8 deletions(-)
 
+diff --git a/netcat.c b/netcat.c
+index 8291173..990c31b 100644
 --- a/netcat.c
 +++ b/netcat.c
 @@ -46,6 +46,9 @@
  #ifdef __linux__
  # include <linux/in6.h>
  #endif
-+#if defined(TCP_MD5SIG) && defined(TCP_MD5SIG_MAXKEYLEN)
++#if defined(TCP_MD5SIG_EXT) && defined(TCP_MD5SIG_MAXKEYLEN)
 +# include <bsd/readpassphrase.h>
 +#endif
  
  #ifndef IPTOS_LOWDELAY
  # define IPTOS_LOWDELAY 0x10
-@@ -175,6 +178,9 @@ FILE	*Zflag;					/* file to save peer ce
+@@ -175,6 +178,9 @@ FILE	*Zflag;					/* file to save peer cert */
  int	Cflag = 0;			/* CRLF line-ending */
- # endif
+ #endif
  
-+# if defined(TCP_MD5SIG) && defined(TCP_MD5SIG_MAXKEYLEN)
++#if defined(TCP_MD5SIG_EXT) && defined(TCP_MD5SIG_MAXKEYLEN)
 +char Sflag_password[TCP_MD5SIG_MAXKEYLEN];
-+# endif
++#endif
  int recvcount, recvlimit;
  int timeout = -1;
  int family = AF_UNSPEC;
-@@ -205,7 +211,7 @@ int	udptest(int);
+@@ -206,7 +212,7 @@ void	connection_info(const char *, const char *, const char *, const char *);
  int	unix_bind(char *, int);
  int	unix_connect(char *);
  int	unix_listen(char *);
 -void	set_common_sockopts(int, int);
 +void	set_common_sockopts(int, const struct sockaddr *);
  int	process_tos_opt(char *, int *);
- # if defined(TLS)
+ #ifdef HAVE_TLS
  int	process_tls_opt(char *, int *);
-@@ -458,7 +464,10 @@ main(int argc, char *argv[])
+@@ -456,7 +462,10 @@ main(int argc, char *argv[])
  			break;
- # endif
+ #endif
  		case 'S':
--# if defined(TCP_MD5SIG)
-+# if defined(TCP_MD5SIG) && defined(TCP_MD5SIG_MAXKEYLEN)
+-#ifdef TCP_MD5SIG
++#if defined(TCP_MD5SIG_EXT) && defined(TCP_MD5SIG_MAXKEYLEN)
 +			if (readpassphrase("TCP MD5SIG password: ",
 +					Sflag_password, TCP_MD5SIG_MAXKEYLEN, RPP_REQUIRE_TTY) == NULL)
 +				errx(1, "Unable to read TCP MD5SIG password");
  			Sflag = 1;
- # else
+ #else
  			errx(1, "no TCP MD5 signature support available");
-@@ -1169,7 +1178,7 @@ remote_connect(const char *host, const c
+@@ -1161,7 +1170,7 @@ remote_connect(const char *host, const char *port, struct addrinfo hints,
  			freeaddrinfo(ares);
  		}
  
 -		set_common_sockopts(s, res->ai_family);
 +		set_common_sockopts(s, res->ai_addr);
- 		char *proto = proto_name(uflag, dccpflag);
  
- 		if ((error = connect_with_timeout(s, res->ai_addr, res->ai_addrlen, timeout)) == CONNECTION_SUCCESS)
-@@ -1323,7 +1332,7 @@ local_listen(const char *host, const cha
+ 		if (ipaddr != NULL) {
+ 			herr = getnameinfo(res->ai_addr, res->ai_addrlen,
+@@ -1336,7 +1345,7 @@ local_listen(const char *host, const char *port, struct addrinfo hints)
  			err(1, NULL);
- # endif
+ #endif
  
 -		set_common_sockopts(s, res->ai_family);
 +		set_common_sockopts(s, res->ai_addr);
  
  		if (bind(s, (struct sockaddr *)res->ai_addr,
  		    res->ai_addrlen) == 0)
-@@ -1855,9 +1864,10 @@ udptest(int s)
+@@ -1910,9 +1919,10 @@ connection_info(const char *host, const char *port, const char *proto,
  }
  
  void
@@ -77,25 +79,27 @@ Subject: Set TCP MD5SIG correctly for client connections
  	int x = 1;
 +	int af = sa->sa_family;
  
- # if defined(SO_BROADCAST)
+ #ifdef SO_BROADCAST
  	if (bflag) {
-@@ -1868,10 +1878,17 @@ set_common_sockopts(int s, int af)
+@@ -1923,10 +1933,18 @@ set_common_sockopts(int s, int af)
  			err(1, NULL);
  	}
- # endif
--# if defined(TCP_MD5SIG)
-+# if defined(TCP_MD5SIG) && defined(TCP_MD5SIG_MAXKEYLEN)
+ #endif
+-#ifdef TCP_MD5SIG
++#if defined(TCP_MD5SIG_EXT) && defined(TCP_MD5SIG_MAXKEYLEN)
  	if (Sflag) {
+-		if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
+-		    &x, sizeof(x)) == -1)
 +		struct tcp_md5sig sig;
 +		memset(&sig, 0, sizeof(sig));
 +		memcpy(&sig.tcpm_addr, sa, sizeof(struct sockaddr_storage));
 +		sig.tcpm_keylen = TCP_MD5SIG_MAXKEYLEN < strlen(Sflag_password)
 +		    ? TCP_MD5SIG_MAXKEYLEN
 +		    : strlen(Sflag_password);
-+		strlcpy(sig.tcpm_key, Sflag_password, sig.tcpm_keylen);
- 		if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
--			&x, sizeof(x)) == -1)
++		memcpy(sig.tcpm_key, Sflag_password, sig.tcpm_keylen);
++		sig.tcpm_flags = TCP_MD5SIG_FLAG_PREFIX;
++		if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG_EXT,
 +		    &sig, sizeof(sig)) == -1)
  			err(1, NULL);
  	}
- # endif
+ #endif

udp-scan-timeout.patch

@@ -1,11 +1,13 @@
 From: Aron Xu <aron@debian.org>
 Date: Mon, 13 Feb 2012 15:29:37 +0800
-Subject: udp scan timeout
+Subject: Fix UDP scan timeout
 
 ---
- netcat.c |   23 +++++++++++++++--------
- 1 file changed, 15 insertions(+), 8 deletions(-)
+ netcat.c | 21 ++++++++++++++-------
+ 1 file changed, 14 insertions(+), 7 deletions(-)
 
+diff --git a/netcat.c b/netcat.c
+index 03d339c..dd893ac 100644
 --- a/netcat.c
 +++ b/netcat.c
 @@ -129,6 +129,8 @@
@@ -17,22 +19,17 @@ Subject: udp scan timeout
  /* Command Line Options */
  int	dflag;					/* detached, no stdin */
  int	Fflag;					/* fdpass sock to stdout */
-@@ -822,7 +824,7 @@ main(int argc, char *argv[])
- 				continue;
- 
- 			ret = 0;
--			if (vflag || zflag) {
-+			if (vflag) {
- 				/* For UDP, make sure we are connected. */
- 				if (uflag) {
- 					if (udptest(s) == -1) {
-@@ -1767,15 +1769,20 @@ build_ports(char *p)
+@@ -1794,19 +1796,24 @@ build_ports(char *p)
  int
  udptest(int s)
  {
 -	int i, ret;
 +	int i, t;
  
+ 	/* Only write to the socket in scan mode or interactive mode. */
+ 	if (!zflag && !isatty(STDIN_FILENO))
+ 		return 0;
+ 
 -	for (i = 0; i <= 3; i++) {
 -		if (write(s, "X", 1) == 1)
 -			ret = 1;

use-flags-to-specify-listen-address.patch

@@ -1,12 +1,14 @@
 From: Guilhem Moulin <guilhem@debian.org>
 Date: Mon, 22 Oct 2018 04:50:54 +0200
-Subject: use -s/-p flags to specify listen address
+Subject: Add ability to use -s/-p flags to specify listening address
 
 ---
  nc.1     | 18 ++++++++++++++----
- netcat.c |   49 +++++++++++++++++++++++++++++--------------------
- 2 files changed, 43 insertions(+), 24 deletions(-)
+ netcat.c | 47 +++++++++++++++++++++++++++++++----------------
+ 2 files changed, 45 insertions(+), 20 deletions(-)
 
+diff --git a/nc.1 b/nc.1
+index 80c654c..d30389a 100644
 --- a/nc.1
 +++ b/nc.1
 @@ -143,8 +143,20 @@ multiple hosts.
@@ -32,7 +34,7 @@ Subject: use -s/-p flags to specify listen address
  Additionally, any timeouts specified with the
  .Fl w
  option are ignored.
-@@ -194,8 +206,6 @@ For
+@@ -193,8 +205,6 @@ For
  datagram sockets, specifies the local temporary socket file
  to create and use so that datagrams can be received.
  Cannot be used together with
@@ -41,36 +43,36 @@ Subject: use -s/-p flags to specify listen address
  .Fl x .
  .It Fl T Ar keyword
  Change the IPv4 TOS/IPv6 traffic class value.
+diff --git a/netcat.c b/netcat.c
+index bef27a4..0caba28 100644
 --- a/netcat.c
 +++ b/netcat.c
-@@ -509,31 +509,40 @@ main(int argc, char *argv[])
- # endif
+@@ -507,27 +507,42 @@ main(int argc, char *argv[])
+ #endif
  
  	/* Cruft to make sure options are clean, and used properly. */
--	if (argv[0] && !argv[1] && family == AF_UNIX) {
--# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
+-	if (argc == 1 && family == AF_UNIX) {
+-#if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
 -		if (dccpflag)
 -			errx(1, "cannot use -Z and -U");
--# endif
+-#endif
 -		host = argv[0];
--		uport = NULL;
--	} else if (!argv[0] && lflag) {
+-	} else if (argc == 0 && lflag) {
 -		if (sflag)
 -			errx(1, "cannot use -s and -l");
 -		if (pflag)
 -			errx(1, "cannot use -p and -l");
 -		if (zflag)
 -			errx(1, "cannot use -z and -l");
--	} else if (argv[0] && !argv[1]) {
--		if (!lflag)
--			usage(1);
+-	} else if (argc == 1 && lflag) {
 -		uport = &argv[0];
--		host = NULL;
--	} else if (argv[0] && argv[1]) {
+-	} else if (argc == 2) {
 +	if (argc == 0 && lflag) {
 +		uport = &pflag;
 +		host = sflag;
-+	} else if (argc == 1 && !pflag && !sflag) {
++	} else if (argc == 1 && !pflag &&
++			/* `nc -l 12345` or `nc -U bar` or `nc -uU -s foo bar` */
++			(!sflag || (family == AF_UNIX && uflag && !lflag))) {
 +		if (family == AF_UNIX) {
 +			host = argv[0];
 +			uport = NULL;
@@ -87,10 +89,10 @@ Subject: use -s/-p flags to specify listen address
  		usage(1);
  
 +	if (family == AF_UNIX) {
-+# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
++#if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
 +		if (dccpflag)
 +			errx(1, "cannot use -Z and -U");
-+# endif
++#endif
 +		if (uport && *uport)
 +			errx(1, "cannot use port with -U");
 +		if (!host)
@@ -101,6 +103,6 @@ Subject: use -s/-p flags to specify listen address
 +	if (lflag && zflag)
 +		errx(1, "cannot use -z and -l");
 +
- # if defined(TLS)
+ #ifdef HAVE_TLS
  	if (usetls) {
  		if (Cflag && unveil(Cflag, "r") == -1)