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network/netcat-openbsd: Remove unused patches. 

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>
This commit is contained in:
Donald Cooley 2020-02-15 08:12:06 +07:00 committed by Willy Sudiarto Raharjo
parent 320dc7d69d
commit aadf2e710b
No known key found for this signature in database
GPG Key ID: 887B8374D7333381
7 changed files with 1 additions and 1082 deletions
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2
network/netcat-openbsd/netcat-openbsd.SlackBuild
View File

@ -25,7 +25,7 @@
PRGNAM=netcat-openbsd PRGNAM=netcat-openbsd
VERSION=${VERSION:-1.206} VERSION=${VERSION:-1.206}
BUILD=${BUILD:-1} BUILD=${BUILD:-2}
TAG=${TAG:-_SBo} TAG=${TAG:-_SBo}
DEBVER=1 DEBVER=1

121
network/netcat-openbsd/patches/0002-connect-timeout.patch
View File

@ -1,121 +0,0 @@
From: Aron Xu <aron@debian.org>
Date: Mon, 13 Feb 2012 14:43:56 +0800
Subject: connect timeout
---
netcat.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 75 insertions(+), 2 deletions(-)
diff --git a/netcat.c b/netcat.c
index 9b2def2..f3cc8c1 100644
--- a/netcat.c
+++ b/netcat.c
@@ -106,6 +106,10 @@
#define PORT_MAX_LEN 6
#define UNIX_DG_TMP_SOCKET_SIZE 19
+#define CONNECTION_SUCCESS 0
+#define CONNECTION_FAILED 1
+#define CONNECTION_TIMEOUT 2
+
/* Command Line Options */
int dflag; /* detached, no stdin */
unsigned int iflag; /* Interval Flag */
@@ -151,6 +155,9 @@ void set_common_sockopts(int);
int map_tos(char *, int *);
void usage(int);
+static int connect_with_timeout(int fd, const struct sockaddr *sa,
+ socklen_t salen, int ctimeout);
+
int
main(int argc, char *argv[])
{
@@ -651,11 +658,14 @@ remote_connect(const char *host, const char *port, struct addrinfo hints)
set_common_sockopts(s);
- if (timeout_connect(s, res0->ai_addr, res0->ai_addrlen) == 0)
+ if ((error = connect_with_timeout(s, res0->ai_addr, res0->ai_addrlen, timeout))== CONNECTION_SUCCESS)
break;
- else if (vflag)
+ else 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");
close(s);
s = -1;
@@ -703,6 +713,69 @@ timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
return (ret);
}
+static int connect_with_timeout(int fd, const struct sockaddr *sa,
+ socklen_t salen, int ctimeout)
+{
+ int err;
+ struct timeval tv, *tvp = NULL;
+ fd_set connect_fdset;
+ socklen_t len;
+ int orig_flags;
+
+ orig_flags = fcntl(fd, F_GETFL, 0);
+ if (fcntl(fd, F_SETFL, orig_flags | O_NONBLOCK) < 0 ) {
+ warn("can't set O_NONBLOCK - timeout not available");
+ if (connect(fd, sa, salen) == 0)
+ return CONNECTION_SUCCESS;
+ else
+ return CONNECTION_FAILED;
+ }
+
+ /* set connect timeout */
+ if (ctimeout > 0) {
+ tv.tv_sec = (time_t)ctimeout/1000;
+ tv.tv_usec = 0;
+ tvp = &tv;
+ }
+
+ /* attempt the connection */
+ err = connect(fd, sa, salen);
+ if (err != 0 && errno == EINPROGRESS) {
+ /* connection is proceeding
+ * it is complete (or failed) when select returns */
+
+ /* initialize connect_fdset */
+ FD_ZERO(&connect_fdset);
+ FD_SET(fd, &connect_fdset);
+
+ /* call select */
+ do {
+ err = select(fd + 1, NULL, &connect_fdset,
+ NULL, tvp);
+ } while (err < 0 && errno == EINTR);
+
+ /* select error */
+ if (err < 0)
+ errx(1,"select error: %s", strerror(errno));
+ /* we have reached a timeout */
+ if (err == 0)
+ return CONNECTION_TIMEOUT;
+ /* select returned successfully, but we must test socket
+ * error for result */
+ len = sizeof(err);
+ if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &len) < 0)
+ errx(1, "getsockopt error: %s", strerror(errno));
+ /* setup errno according to the result returned by
+ * getsockopt */
+ if (err != 0)
+ errno = err;
+ }
+
+ /* return aborted if an error occured, and valid otherwise */
+ fcntl(fd, F_SETFL, orig_flags);
+ return (err != 0)? CONNECTION_FAILED : CONNECTION_SUCCESS;
+}
+
/*
* local_listen()
* Returns a socket listening on a local port, binds to specified source
--

34
network/netcat-openbsd/patches/0003-get-sev-by-name.patch
View File

@ -1,34 +0,0 @@
From: Aron Xu <aron@debian.org>
Date: Mon, 13 Feb 2012 14:45:08 +0800
Subject: get sev by name
---
netcat.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/netcat.c b/netcat.c
index f3cc8c1..d912544 100644
--- a/netcat.c
+++ b/netcat.c
@@ -949,12 +949,19 @@ atelnet(int nfd, unsigned char *buf, unsigned int size)
void
build_ports(char *p)
{
+ struct servent *sv;
const char *errstr;
char *n;
int hi, lo, cp;
int x = 0;
- if ((n = strchr(p, '-')) != NULL) {
+ sv = getservbyname(p, uflag ? "udp" : "tcp");
+ if (sv) {
+ portlist[0] = calloc(1, PORT_MAX_LEN);
+ if (portlist[0] == NULL)
+ err(1, NULL);
+ snprintf(portlist[0], PORT_MAX_LEN, "%d", ntohs(sv->s_port));
+ } else if ((n = strchr(p, '-')) != NULL) {
*n = '\0';
n++;
--

59
network/netcat-openbsd/patches/0004-poll-hup.patch
View File

@ -1,59 +0,0 @@
From: Aron Xu <aron@debian.org>
Date: Mon, 13 Feb 2012 15:08:33 +0800
Subject: poll hup
---
netcat.c | 24 +++++++++++++++++-------
1 file changed, 17 insertions(+), 7 deletions(-)
diff --git a/netcat.c b/netcat.c
index d912544..fdaca44 100644
--- a/netcat.c
+++ b/netcat.c
@@ -884,9 +884,7 @@ readwrite(int nfd)
if ((n = read(nfd, buf, plen)) < 0)
return;
else if (n == 0) {
- shutdown(nfd, SHUT_RD);
- pfd[0].fd = -1;
- pfd[0].events = 0;
+ goto shutdown_rd;
} else {
if (tflag)
atelnet(nfd, buf, n);
@@ -894,18 +892,30 @@ readwrite(int nfd)
return;
}
}
+ else if (pfd[0].revents & POLLHUP) {
+ shutdown_rd:
+ shutdown(nfd, SHUT_RD);
+ pfd[0].fd = -1;
+ pfd[0].events = 0;
+ }
- if (!dflag && pfd[1].revents & POLLIN) {
+ if (!dflag) {
+ if(pfd[1].revents & POLLIN) {
if ((n = read(wfd, buf, plen)) < 0)
return;
else if (n == 0) {
- shutdown(nfd, SHUT_WR);
- pfd[1].fd = -1;
- pfd[1].events = 0;
+ goto shutdown_wr;
} else {
if (atomicio(vwrite, nfd, buf, n) != n)
return;
}
+ }
+ else if (pfd[1].revents & POLLHUP) {
+ shutdown_wr:
+ shutdown(nfd, SHUT_WR);
+ pfd[1].fd = -1;
+ pfd[1].events = 0;
+ }
}
}
}
--

106
network/netcat-openbsd/patches/0008-verbose-numeric-port.patch
View File

@ -1,106 +0,0 @@
From: Aron Xu <aron@debian.org>
Date: Mon, 13 Feb 2012 15:38:15 +0800
Subject: verbose numeric port
---
netcat.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 55 insertions(+), 4 deletions(-)
diff --git a/netcat.c b/netcat.c
index baab909..eb3453e 100644
--- a/netcat.c
+++ b/netcat.c
@@ -41,6 +41,7 @@
#include <netinet/tcp.h>
#include <netinet/ip.h>
#include <arpa/telnet.h>
+#include <arpa/inet.h>
#ifndef IPTOS_LOWDELAY
# define IPTOS_LOWDELAY 0x10
@@ -424,6 +425,18 @@ main(int argc, char *argv[])
s = local_listen(host, uport, hints);
if (s < 0)
err(1, NULL);
+
+ char* local;
+ if (family == AF_INET6
+ local = "0.0.0.0";
+ else if (family == AF_INET)
+ local = ":::";
+ else
+ local = "unknown"
+ fprintf(stderr, "Listening on [%s] (family %d, port %d)\n",
+ host ?: local,
+ family,
+ *uport);
/*
* For UDP, we will use recvfrom() initially
* to wait for a caller, then use the regular
@@ -432,16 +445,15 @@ main(int argc, char *argv[])
if (uflag) {
int rv, plen;
char buf[16384];
- struct sockaddr_storage z;
- len = sizeof(z);
+ len = sizeof(cliaddr);
plen = jflag ? 16384 : 2048;
rv = recvfrom(s, buf, plen, MSG_PEEK,
- (struct sockaddr *)&z, &len);
+ (struct sockaddr *)&cliaddr, &len);
if (rv < 0)
err(1, "recvfrom");
- rv = connect(s, (struct sockaddr *)&z, len);
+ rv = connect(s, (struct sockaddr *)&cliaddr, len);
if (rv < 0)
err(1, "connect");
@@ -450,6 +462,45 @@ main(int argc, char *argv[])
len = sizeof(cliaddr);
connfd = accept(s, (struct sockaddr *)&cliaddr,
&len);
+ if(vflag) {
+ /* Don't look up port if -n. */
+ if (nflag)
+ sv = NULL;
+ else
+ sv = getservbyport(ntohs(atoi(uport)),
+ uflag ? "udp" : "tcp");
+
+ if (((struct sockaddr *)&cliaddr)->sa_family == AF_INET) {
+ char dst[INET_ADDRSTRLEN];
+ inet_ntop(((struct sockaddr *)&cliaddr)->sa_family,&(((struct sockaddr_in *)&cliaddr)->sin_addr),dst,INET_ADDRSTRLEN);
+ fprintf(stderr, "Connection from [%s] port %s [%s/%s] accepted (family %d, sport %d)\n",
+ dst,
+ uport,
+ uflag ? "udp" : "tcp",
+ sv ? sv->s_name : "*",
+ ((struct sockaddr *)(&cliaddr))->sa_family,
+ ntohs(((struct sockaddr_in *)&cliaddr)->sin_port));
+ }
+ else if(((struct sockaddr *)&cliaddr)->sa_family == AF_INET6) {
+ char dst[INET6_ADDRSTRLEN];
+ inet_ntop(((struct sockaddr *)&cliaddr)->sa_family,&(((struct sockaddr_in6 *)&cliaddr)->sin6_addr),dst,INET6_ADDRSTRLEN);
+ fprintf(stderr, "Connection from [%s] port %s [%s/%s] accepted (family %d, sport %d)\n",
+ dst,
+ uport,
+ uflag ? "udp" : "tcp",
+ sv ? sv->s_name : "*",
+ ((struct sockaddr *)&cliaddr)->sa_family,
+ ntohs(((struct sockaddr_in6 *)&cliaddr)->sin6_port));
+ }
+ else {
+ fprintf(stderr, "Connection from unknown port %s [%s/%s] accepted (family %d, sport %d)\n",
+ uport,
+ uflag ? "udp" : "tcp",
+ sv ? sv->s_name : "*",
+ ((struct sockaddr *)(&cliaddr))->sa_family,
+ ntohs(((struct sockaddr_in *)&cliaddr)->sin_port));
+ }
+ }
readwrite(connfd);
close(connfd);
}
--

304
network/netcat-openbsd/patches/0009-dccp-support.patch
View File

@ -1,304 +0,0 @@
From: Aron Xu <aron@debian.org>
Date: Mon, 13 Feb 2012 15:56:51 +0800
Subject: dccp support
---
nc.1 | 4 ++-
netcat.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++------------
2 files changed, 93 insertions(+), 22 deletions(-)
diff --git a/nc.1 b/nc.1
index 0d92b74..60e3668 100644
--- a/nc.1
+++ b/nc.1
@@ -34,7 +34,7 @@
.Sh SYNOPSIS
.Nm nc
.Bk -words
-.Op Fl 46CDdhklnrStUuvz
+.Op Fl 46CDdhklnrStUuvZz
.Op Fl I Ar length
.Op Fl i Ar interval
.Op Fl O Ar length
@@ -257,6 +257,8 @@ If
.Ar port
is not specified, the well-known port for the proxy protocol is used (1080
for SOCKS, 3128 for HTTPS).
+.It Fl Z
+DCCP mode.
.It Fl z
Specifies that
.Nm
diff --git a/netcat.c b/netcat.c
index eb3453e..56cc15e 100644
--- a/netcat.c
+++ b/netcat.c
@@ -129,6 +129,7 @@ int rflag; /* Random ports flag */
char *sflag; /* Source Address */
int tflag; /* Telnet Emulation */
int uflag; /* UDP - Default to TCP */
+int dccpflag; /* DCCP - Default to TCP */
int vflag; /* Verbosity */
int xflag; /* Socks proxy */
int zflag; /* Port Scan Flag */
@@ -160,6 +161,7 @@ int unix_listen(char *);
void set_common_sockopts(int);
int map_tos(char *, int *);
void usage(int);
+char *proto_name(int uflag, int dccpflag);
static int connect_with_timeout(int fd, const struct sockaddr *sa,
socklen_t salen, int ctimeout);
@@ -187,7 +189,7 @@ main(int argc, char *argv[])
sv = NULL;
while ((ch = getopt(argc, argv,
- "46CDdhI:i:jklnO:P:p:q:rSs:tT:UuV:vw:X:x:z")) != -1) {
+ "46CDdhI:i:jklnO:P:p:q:rSs:tT:UuV:vw:X:x:Zz")) != -1) {
switch (ch) {
case '4':
family = AF_INET;
@@ -258,6 +260,13 @@ main(int argc, char *argv[])
case 'u':
uflag = 1;
break;
+ case 'Z':
+# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
+ dccpflag = 1;
+# else
+ errx(1, "no DCCP support available");
+# endif
+ break;
case 'V':
# if defined(RT_TABLEID_MAX)
rtableid = (unsigned int)strtonum(optarg, 0,
@@ -333,6 +342,12 @@ main(int argc, char *argv[])
/* Cruft to make sure options are clean, and used properly. */
if (argv[0] && !argv[1] && family == AF_UNIX) {
+ if (uflag)
+ errx(1, "cannot use -u and -U");
+# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
+ if (dccpflag)
+ errx(1, "cannot use -Z and -U");
+# endif
host = argv[0];
uport = NULL;
} else if (!argv[0] && lflag) {
@@ -374,8 +389,20 @@ main(int argc, char *argv[])
if (family != AF_UNIX) {
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = family;
- hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
- hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
+ if (uflag) {
+ hints.ai_socktype = SOCK_DGRAM;
+ hints.ai_protocol = IPPROTO_UDP;
+ }
+# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
+ else if (dccpflag) {
+ hints.ai_socktype = SOCK_DCCP;
+ hints.ai_protocol = IPPROTO_DCCP;
+ }
+# endif
+ else {
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_protocol = IPPROTO_TCP;
+ }
if (nflag)
hints.ai_flags |= AI_NUMERICHOST;
}
@@ -383,7 +410,10 @@ 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 (dccpflag)
+ errx(1, "no proxy support for DCCP mode");
+# endif
if (lflag)
errx(1, "no proxy support for listen");
@@ -427,12 +457,12 @@ main(int argc, char *argv[])
err(1, NULL);
char* local;
- if (family == AF_INET6
+ if (family == AF_INET6 )
local = "0.0.0.0";
else if (family == AF_INET)
local = ":::";
else
- local = "unknown"
+ local = "unknown";
fprintf(stderr, "Listening on [%s] (family %d, port %d)\n",
host ?: local,
family,
@@ -463,12 +493,13 @@ main(int argc, char *argv[])
connfd = accept(s, (struct sockaddr *)&cliaddr,
&len);
if(vflag) {
+ char *proto = proto_name(uflag, dccpflag);
/* Don't look up port if -n. */
if (nflag)
sv = NULL;
else
sv = getservbyport(ntohs(atoi(uport)),
- uflag ? "udp" : "tcp");
+ proto);
if (((struct sockaddr *)&cliaddr)->sa_family == AF_INET) {
char dst[INET_ADDRSTRLEN];
@@ -476,7 +507,7 @@ main(int argc, char *argv[])
fprintf(stderr, "Connection from [%s] port %s [%s/%s] accepted (family %d, sport %d)\n",
dst,
uport,
- uflag ? "udp" : "tcp",
+ proto,
sv ? sv->s_name : "*",
((struct sockaddr *)(&cliaddr))->sa_family,
ntohs(((struct sockaddr_in *)&cliaddr)->sin_port));
@@ -487,7 +518,7 @@ main(int argc, char *argv[])
fprintf(stderr, "Connection from [%s] port %s [%s/%s] accepted (family %d, sport %d)\n",
dst,
uport,
- uflag ? "udp" : "tcp",
+ proto,
sv ? sv->s_name : "*",
((struct sockaddr *)&cliaddr)->sa_family,
ntohs(((struct sockaddr_in6 *)&cliaddr)->sin6_port));
@@ -495,7 +526,7 @@ main(int argc, char *argv[])
else {
fprintf(stderr, "Connection from unknown port %s [%s/%s] accepted (family %d, sport %d)\n",
uport,
- uflag ? "udp" : "tcp",
+ proto,
sv ? sv->s_name : "*",
((struct sockaddr *)(&cliaddr))->sa_family,
ntohs(((struct sockaddr_in *)&cliaddr)->sin_port));
@@ -559,19 +590,20 @@ main(int argc, char *argv[])
}
}
+ 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 : "*");
}
if (!zflag)
@@ -671,6 +703,24 @@ unix_listen(char *path)
return (s);
}
+char *proto_name(uflag, dccpflag) {
+
+ char *proto = NULL;
+ if (uflag) {
+ proto = "udp";
+ }
+# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
+ else if (dccpflag) {
+ proto = "dccp";
+ }
+# endif
+ else {
+ proto = "tcp";
+ }
+
+ return proto;
+}
+
/*
* remote_connect()
* Returns a socket connected to a remote host. Properly binds to a local
@@ -709,8 +759,21 @@ remote_connect(const char *host, const char *port, struct addrinfo hints)
# endif
memset(&ahints, 0, sizeof(struct addrinfo));
ahints.ai_family = res0->ai_family;
- ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
- ahints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP;
+ if (uflag) {
+ ahints.ai_socktype = SOCK_DGRAM;
+ ahints.ai_protocol = IPPROTO_UDP;
+
+ }
+# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
+ else if (dccpflag) {
+ hints.ai_socktype = SOCK_DCCP;
+ hints.ai_protocol = IPPROTO_DCCP;
+ }
+# endif
+ else {
+ ahints.ai_socktype = SOCK_STREAM;
+ ahints.ai_protocol = IPPROTO_TCP;
+ }
ahints.ai_flags = AI_PASSIVE;
if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
errx(1, "getaddrinfo: %s", gai_strerror(error));
@@ -722,15 +785,19 @@ remote_connect(const char *host, const char *port, struct addrinfo hints)
}
set_common_sockopts(s);
+ char *proto = proto_name(uflag, dccpflag);
- if ((error = connect_with_timeout(s, res0->ai_addr, res0->ai_addrlen, timeout))== CONNECTION_SUCCESS)
+ if ((error = connect_with_timeout(s, res0->ai_addr, res0->ai_addrlen, timeout))== CONNECTION_SUCCESS) {
break;
- else if (vflag && error == CONNECTION_FAILED)
+ }
+ else 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);
+ }
close(s);
s = -1;
@@ -1047,7 +1114,8 @@ build_ports(char *p)
int hi, lo, cp;
int x = 0;
- sv = getservbyname(p, uflag ? "udp" : "tcp");
+ char *proto = proto_name(uflag, dccpflag);
+ sv = getservbyname(p, proto);
if (sv) {
portlist[0] = calloc(1, PORT_MAX_LEN);
if (portlist[0] == NULL)
@@ -1252,6 +1320,7 @@ help(void)
\t-w secs\t 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\
+ \t-Z DCCP mode\n\
\t-z Zero-I/O mode [used for scanning]\n\
Port numbers can be individual or ranges: lo-hi [inclusive]\n");
exit(0);
@@ -1261,7 +1330,7 @@ void
usage(int ret)
{
fprintf(stderr,
- "usage: nc [-46CDdhjklnrStUuvz] [-I length] [-i interval] [-O length]\n"
+ "usage: nc [-46CDdhjklnrStUuvZz] [-I length] [-i interval] [-O length]\n"
"\t [-P proxy_username] [-p source_port] [-q seconds] [-s source]\n"
"\t [-T toskeyword] [-V rtable] [-w timeout] [-X proxy_protocol]\n"
"\t [-x proxy_address[:port]] [destination] [port]\n");
--

457
network/netcat-openbsd/patches/0011-misc-failures-and-features.patch
View File

@ -1,457 +0,0 @@
From: Aron Xu <aron@debian.org>
Date: Mon, 13 Feb 2012 19:06:52 +0800
Subject: misc connection failures
---
nc.1 | 76 ++++++++++++++++++++++++++++++++++++---
netcat.c | 119 ++++++++++++++++++++++++++++++++++++++++++--------------------
2 files changed, 153 insertions(+), 42 deletions(-)
diff --git a/nc.1 b/nc.1
index 60e3668..477cb1b 100644
--- a/nc.1
+++ b/nc.1
@@ -34,7 +34,7 @@
.Sh SYNOPSIS
.Nm nc
.Bk -words
-.Op Fl 46CDdhklnrStUuvZz
+.Op Fl 46bCDdhklnrStUuvZz
.Op Fl I Ar length
.Op Fl i Ar interval
.Op Fl O Ar length
@@ -99,6 +99,8 @@ to use IPv4 addresses only.
Forces
.Nm
to use IPv6 addresses only.
+.It Fl b
+Allow broadcast.
.It Fl C
Send CRLF as line-ending.
.It Fl D
@@ -323,6 +325,54 @@ and which side is being used as a
The connection may be terminated using an
.Dv EOF
.Pq Sq ^D .
+.Pp
+There is no
+.Fl c
+or
+.Fl e
+option in this netcat, but you still can execute a command after connection
+being established by redirecting file descriptors. Be cautious here because
+opening a port and let anyone connected execute arbitrary command on your
+site is DANGEROUS. If you really need to do this, here is an example:
+.Pp
+On
+.Sq server
+side:
+.Pp
+.Dl $ rm -f /tmp/f; mkfifo /tmp/f
+.Dl $ cat /tmp/f | /bin/sh -i 2>&1 | nc -l 127.0.0.1 1234 > /tmp/f
+.Pp
+On
+.Sq client
+side:
+.Pp
+.Dl $ nc host.example.com 1234
+.Dl $ (shell prompt from host.example.com)
+.Pp
+By doing this, you create a fifo at /tmp/f and make nc listen at port 1234
+of address 127.0.0.1 on
+.Sq server
+side, when a
+.Sq client
+establishes a connection successfully to that port, /bin/sh gets executed
+on
+.Sq server
+side and the shell prompt is given to
+.Sq client
+side.
+.Pp
+When connection is terminated,
+.Nm
+quits as well. Use
+.Fl k
+if you want it keep listening, but if the command quits this option won't
+restart it or keep
+.Nm
+running. Also don't forget to remove the file descriptor once you don't need
+it anymore:
+.Pp
+.Dl $ rm -f /tmp/f
+.Pp
.Sh DATA TRANSFER
The example in the previous section can be expanded to build a
basic data transfer model.
@@ -382,15 +432,30 @@ The
flag can be used to tell
.Nm
to report open ports,
-rather than initiate a connection.
+rather than initiate a connection. Usually it's useful to turn on verbose
+output to stderr by use this option in conjunction with
+.Fl v
+option.
+.Pp
For example:
.Bd -literal -offset indent
-$ nc -z host.example.com 20-30
+$ nc \-zv host.example.com 20-30
Connection to host.example.com 22 port [tcp/ssh] succeeded!
Connection to host.example.com 25 port [tcp/smtp] succeeded!
.Ed
.Pp
-The port range was specified to limit the search to ports 20 \- 30.
+The port range was specified to limit the search to ports 20 \- 30, and is
+scanned by increasing order.
+.Pp
+You can also specify a list of ports to scan, for example:
+.Bd -literal -offset indent
+$ nc \-zv host.example.com 80 20 22
+nc: connect to host.example.com 80 (tcp) failed: Connection refused
+nc: connect to host.example.com 20 (tcp) failed: Connection refused
+Connection to host.example.com port [tcp/ssh] succeeded!
+.Ed
+.Pp
+The ports are scanned by the order you given.
.Pp
Alternatively, it might be useful to know which server software
is running, and which versions.
@@ -455,6 +520,9 @@ Original implementation by *Hobbit*
.br
Rewritten with IPv6 support by
.An Eric Jackson Aq ericj@monkey.org .
+.br
+Modified for Debian port by Aron Xu
+.Aq aron@debian.org .
.Sh CAVEATS
UDP port scans using the
.Fl uz
diff --git a/netcat.c b/netcat.c
index bf9940f..c938d11 100644
--- a/netcat.c
+++ b/netcat.c
@@ -88,6 +88,7 @@
#include <netdb.h>
#include <poll.h>
#include <signal.h>
+#include <stddef.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
@@ -115,6 +116,7 @@
#define UDP_SCAN_TIMEOUT 3 /* Seconds */
/* Command Line Options */
+int bflag; /* Allow Broadcast */
int Cflag = 0; /* CRLF line-ending */
int dflag; /* detached, no stdin */
unsigned int iflag; /* Interval Flag */
@@ -146,7 +148,7 @@ char *portlist[PORT_MAX+1];
char *unix_dg_tmp_socket;
void atelnet(int, unsigned char *, unsigned int);
-void build_ports(char *);
+void build_ports(char **);
void help(void);
int local_listen(char *, char *, struct addrinfo);
void readwrite(int);
@@ -171,11 +173,14 @@ int
main(int argc, char *argv[])
{
int ch, s, ret, socksv;
- char *host, *uport;
+ char *host, **uport;
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;
const char *errstr, *proxyhost = "", *proxyport = NULL;
struct addrinfo proxyhints;
@@ -189,7 +194,7 @@ main(int argc, char *argv[])
sv = NULL;
while ((ch = getopt(argc, argv,
- "46CDdhI:i:jklnO:P:p:q:rSs:tT:UuV:vw:X:x:Zz")) != -1) {
+ "46bCDdhI:i:jklnO:P:p:q:rSs:tT:UuV:vw:X:x:Zz")) != -1) {
switch (ch) {
case '4':
family = AF_INET;
@@ -197,6 +202,13 @@ main(int argc, char *argv[])
case '6':
family = AF_INET6;
break;
+ case 'b':
+# if defined(SO_BROADCAST)
+ bflag = 1;
+# else
+ errx(1, "no broadcast frame support available");
+# endif
+ break;
case 'U':
family = AF_UNIX;
break;
@@ -342,35 +354,40 @@ main(int argc, char *argv[])
/* Cruft to make sure options are clean, and used properly. */
if (argv[0] && !argv[1] && family == AF_UNIX) {
- if (uflag)
- errx(1, "cannot use -u and -U");
# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
if (dccpflag)
errx(1, "cannot use -Z and -U");
# endif
host = argv[0];
uport = NULL;
- } else if (!argv[0] && lflag) {
- if (sflag)
- errx(1, "cannot use -s and -l");
- if (zflag)
- errx(1, "cannot use -z and -l");
- if (pflag)
- uport=pflag;
- } else if (!lflag && kflag) {
- errx(1, "cannot use -k without -l");
- } else if (argv[0] && !argv[1]) {
- if (!lflag)
- usage(1);
- uport = argv[0];
+ } else if (argv[0] && !argv[1] && lflag) {
+ if (pflag) {
+ uport = &pflag;
+ host = argv[0];
+ } else {
+ uport = argv;
+ host = NULL;
+ }
+ } else if (!argv[0] && lflag && pflag) {
+ uport = &pflag;
host = NULL;
} else if (argv[0] && argv[1]) {
host = argv[0];
- uport = argv[1];
+ uport = &argv[1];
} else
usage(1);
-
+ if (lflag) {
+ if (sflag)
+ errx(1, "cannot use -s and -l");
+ if (zflag)
+ errx(1, "cannot use -z and -l");
+ if (pflag)
+ /* This still does not work well because of getopt mess
+ errx(1, "cannot use -p and -l"); */
+ uport = &pflag;
+ } else if (!lflag && kflag)
+ errx(1, "cannot use -k without -l");
/* Get name of temporary socket for unix datagram client */
if ((family == AF_UNIX) && uflag && !lflag) {
@@ -448,7 +465,7 @@ main(int argc, char *argv[])
else
s = unix_listen(host);
} else
- s = local_listen(host, uport, hints);
+ s = local_listen(host, *uport, hints);
if (s < 0)
err(1, NULL);
@@ -457,7 +474,8 @@ main(int argc, char *argv[])
local = ":::";
else
local = "0.0.0.0";
- fprintf(stderr, "Listening on [%s] (family %d, port %d)\n",
+ if (vflag && (family != AF_UNIX))
+ fprintf(stderr, "Listening on [%s] (family %d, port %s)\n",
host ?: local,
family,
*uport);
@@ -490,13 +508,17 @@ main(int argc, char *argv[])
len = sizeof(cliaddr);
connfd = accept(s, (struct sockaddr *)&cliaddr,
&len);
- if(vflag) {
+ if(vflag && family == AF_UNIX) {
+ fprintf(stderr, "Connection from \"%.*s\" accepted\n",
+ (len - (int)offsetof(struct sockaddr_un, sun_path)),
+ ((struct sockaddr_un*)&cliaddr)->sun_path);
+ } else if(vflag) {
char *proto = proto_name(uflag, dccpflag);
/* Don't look up port if -n. */
if (nflag)
sv = NULL;
else
- sv = getservbyport(ntohs(atoi(uport)),
+ sv = getservbyport(ntohs(atoi(*uport)),
proto);
if (((struct sockaddr *)&cliaddr)->sa_family == AF_INET) {
@@ -504,7 +526,7 @@ main(int argc, char *argv[])
inet_ntop(((struct sockaddr *)&cliaddr)->sa_family,&(((struct sockaddr_in *)&cliaddr)->sin_addr),dst,INET_ADDRSTRLEN);
fprintf(stderr, "Connection from [%s] port %s [%s/%s] accepted (family %d, sport %d)\n",
dst,
- uport,
+ *uport,
proto,
sv ? sv->s_name : "*",
((struct sockaddr *)(&cliaddr))->sa_family,
@@ -515,7 +537,7 @@ main(int argc, char *argv[])
inet_ntop(((struct sockaddr *)&cliaddr)->sa_family,&(((struct sockaddr_in6 *)&cliaddr)->sin6_addr),dst,INET6_ADDRSTRLEN);
fprintf(stderr, "Connection from [%s] port %s [%s/%s] accepted (family %d, sport %d)\n",
dst,
- uport,
+ *uport,
proto,
sv ? sv->s_name : "*",
((struct sockaddr *)&cliaddr)->sa_family,
@@ -523,17 +545,21 @@ main(int argc, char *argv[])
}
else {
fprintf(stderr, "Connection from unknown port %s [%s/%s] accepted (family %d, sport %d)\n",
- uport,
+ *uport,
proto,
sv ? sv->s_name : "*",
((struct sockaddr *)(&cliaddr))->sa_family,
ntohs(((struct sockaddr_in *)&cliaddr)->sin_port));
}
}
+ if(!kflag)
+ close(s);
readwrite(connfd);
close(connfd);
}
+ if (vflag && kflag)
+ fprintf(stderr, "Connection closed, listening again.\n");
if (kflag)
continue;
if (family != AF_UNIX) {
@@ -641,6 +667,8 @@ unix_bind(char *path)
return (-1);
}
+ unlink(path);
+
if (bind(s, (struct sockaddr *)&sun, SUN_LEN(&sun)) < 0) {
close(s);
return (-1);
@@ -662,8 +690,10 @@ unix_connect(char *path)
if ((s = unix_bind(unix_dg_tmp_socket)) < 0)
return (-1);
} else {
- if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
+ if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
+ errx(1,"create unix socket failed");
return (-1);
+ }
}
(void)fcntl(s, F_SETFD, 1);
@@ -674,9 +704,11 @@ unix_connect(char *path)
sizeof(sun.sun_path)) {
close(s);
errno = ENAMETOOLONG;
+ warn("unix connect abandoned");
return (-1);
}
if (connect(s, (struct sockaddr *)&sun, SUN_LEN(&sun)) < 0) {
+ warn("unix connect failed");
close(s);
return (-1);
}
@@ -1105,22 +1137,23 @@ atelnet(int nfd, unsigned char *buf, unsigned int size)
* that we should try to connect to.
*/
void
-build_ports(char *p)
+build_ports(char **p)
{
struct servent *sv;
const char *errstr;
char *n;
int hi, lo, cp;
int x = 0;
+ int i;
char *proto = proto_name(uflag, dccpflag);
- sv = getservbyname(p, proto);
+ sv = getservbyname(*p, proto);
if (sv) {
portlist[0] = calloc(1, PORT_MAX_LEN);
if (portlist[0] == NULL)
err(1, NULL);
snprintf(portlist[0], PORT_MAX_LEN, "%d", ntohs(sv->s_port));
- } else if ((n = strchr(p, '-')) != NULL) {
+ } else if ((n = strchr(*p, '-')) != NULL) {
*n = '\0';
n++;
@@ -1128,9 +1161,9 @@ build_ports(char *p)
hi = strtonum(n, 1, PORT_MAX, &errstr);
if (errstr)
errx(1, "port number %s: %s", errstr, n);
- lo = strtonum(p, 1, PORT_MAX, &errstr);
+ lo = strtonum(*p, 1, PORT_MAX, &errstr);
if (errstr)
- errx(1, "port number %s: %s", errstr, p);
+ errx(1, "port number %s: %s", errstr, *p);
if (lo > hi) {
cp = hi;
@@ -1160,10 +1193,12 @@ build_ports(char *p)
}
}
} else {
- hi = strtonum(p, 1, PORT_MAX, &errstr);
+ hi = strtonum(*p, 1, PORT_MAX, &errstr);
if (errstr)
- errx(1, "port number %s: %s", errstr, p);
- portlist[0] = strdup(p);
+ errx(1, "port number %s: %s", errstr, *p);
+ for (i=0;p[i];i++) {
+ portlist[i] = strdup(p[i]);
+ }
if (portlist[0] == NULL)
err(1, NULL);
}
@@ -1198,6 +1233,13 @@ set_common_sockopts(int s)
{
int x = 1;
+# if defined(SO_BROADCAST)
+ if (bflag) {
+ if (setsockopt(s, IPPROTO_TCP, SO_BROADCAST,
+ &x, sizeof(x)) == -1)
+ err(1, NULL);
+ }
+# endif
# if defined(TCP_MD5SIG)
if (Sflag) {
if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
@@ -1293,6 +1335,7 @@ help(void)
fprintf(stderr, "\tCommand Summary:\n\
\t-4 Use IPv4\n\
\t-6 Use IPv6\n\
+ \t-b Allow broadcast\n\
\t-C Send CRLF as line-ending\n\
\t-D Enable the debug socket option\n\
\t-d Detach from stdin\n\
@@ -1329,7 +1372,7 @@ void
usage(int ret)
{
fprintf(stderr,
- "usage: nc [-46CDdhjklnrStUuvZz] [-I length] [-i interval] [-O length]\n"
+ "usage: nc [-46bCDdhjklnrStUuvZz] [-I length] [-i interval] [-O length]\n"
"\t [-P proxy_username] [-p source_port] [-q seconds] [-s source]\n"
"\t [-T toskeyword] [-V rtable] [-w timeout] [-X proxy_protocol]\n"
"\t [-x proxy_address[:port]] [destination] [port]\n");
--