d6f10ff5bf
- Remove patch verbose-numeric-port.patch - Refresh patches: * broadcast-support.patch * build-without-TLS-support.patch * connect-timeout.patch * dccp-support.patch * destination-port-list.patch * get-sev-by-name.patch * misc-failures-and-features.patch * port-to-linux-with-libsd.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 OBS-URL: https://build.opensuse.org/package/show/network:utilities/netcat-openbsd?expand=0&rev=20
146 lines
3.6 KiB
Diff
146 lines
3.6 KiB
Diff
From: Aron Xu <aron@debian.org>
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Date: Mon, 13 Feb 2012 19:06:52 +0800
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Subject: misc failures and features
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---
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Makefile | 3 ++-
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nc.1 | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
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netcat.c | 14 ++++++++++++--
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3 files changed, 65 insertions(+), 3 deletions(-)
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--- a/Makefile
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+++ b/Makefile
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@@ -3,7 +3,8 @@
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PROG= nc
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SRCS= netcat.c atomicio.c socks.c
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-LIBS= `pkg-config --libs libbsd` -lresolv
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+PKG_CONFIG ?= pkg-config
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+LIBS= `$(PKG_CONFIG) --libs libbsd` -lresolv
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OBJS= $(SRCS:.c=.o)
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CFLAGS= -g -O2
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LDFLAGS= -Wl,--no-add-needed
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--- a/nc.1
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+++ b/nc.1
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@@ -365,6 +365,54 @@ and which side is being used as a
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The connection may be terminated using an
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.Dv EOF
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.Pq Sq ^D .
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+.Pp
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+There is no
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+.Fl c
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+or
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+.Fl e
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+option in this netcat, but you still can execute a command after connection
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+being established by redirecting file descriptors. Be cautious here because
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+opening a port and let anyone connected execute arbitrary command on your
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+site is DANGEROUS. If you really need to do this, here is an example:
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+.Pp
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+On
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+.Sq server
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+side:
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+.Pp
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+.Dl $ rm -f /tmp/f; mkfifo /tmp/f
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+.Dl $ cat /tmp/f | /bin/sh -i 2>&1 | nc -l 127.0.0.1 1234 > /tmp/f
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+.Pp
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+On
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+.Sq client
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+side:
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+.Pp
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+.Dl $ nc host.example.com 1234
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+.Dl $ (shell prompt from host.example.com)
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+.Pp
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+By doing this, you create a fifo at /tmp/f and make nc listen at port 1234
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+of address 127.0.0.1 on
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+.Sq server
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+side, when a
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+.Sq client
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+establishes a connection successfully to that port, /bin/sh gets executed
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+on
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+.Sq server
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+side and the shell prompt is given to
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+.Sq client
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+side.
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+.Pp
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+When connection is terminated,
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+.Nm
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+quits as well. Use
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+.Fl k
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+if you want it keep listening, but if the command quits this option won't
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+restart it or keep
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+.Nm
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+running. Also don't forget to remove the file descriptor once you don't need
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+it anymore:
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+.Pp
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+.Dl $ rm -f /tmp/f
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+.Pp
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.Sh DATA TRANSFER
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The example in the previous section can be expanded to build a
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basic data transfer model.
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@@ -517,6 +565,9 @@ Original implementation by
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.br
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Rewritten with IPv6 support by
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.An Eric Jackson Aq Mt ericj@monkey.org .
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+.br
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+Modified for Debian port by Aron Xu
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+.Aq aron@debian.org .
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.Sh CAVEATS
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UDP port scans using the
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.Fl uz
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--- a/netcat.c
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+++ b/netcat.c
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@@ -98,6 +98,7 @@
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#include <netdb.h>
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#include <poll.h>
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#include <signal.h>
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+#include <stddef.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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@@ -246,7 +247,10 @@ main(int argc, char *argv[])
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struct addrinfo hints;
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struct servent *sv;
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socklen_t len;
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- struct sockaddr_storage cliaddr;
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+ union {
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+ struct sockaddr_storage storage;
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+ struct sockaddr_un forunix;
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+ } cliaddr;
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char *proxy = NULL, *proxyport = NULL;
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const char *errstr;
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struct addrinfo proxyhints;
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@@ -945,6 +949,8 @@ unix_bind(char *path, int flags)
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0)) < 0)
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return -1;
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+ unlink(path);
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+
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memset(&s_un, 0, sizeof(struct sockaddr_un));
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s_un.sun_family = AF_UNIX;
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@@ -1070,8 +1076,10 @@ unix_connect(char *path)
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if ((s = unix_bind(unix_dg_tmp_socket, SOCK_CLOEXEC)) < 0)
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return -1;
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} else {
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- if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0)
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+ if ((s = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0)) < 0) {
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+ errx(1, "create unix socket failed");
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return -1;
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+ }
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}
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memset(&s_un, 0, sizeof(struct sockaddr_un));
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@@ -1081,10 +1089,12 @@ unix_connect(char *path)
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sizeof(s_un.sun_path)) {
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close(s);
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errno = ENAMETOOLONG;
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+ warn("unix connect abandoned");
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return -1;
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}
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if (connect(s, (struct sockaddr *)&s_un, sizeof(s_un)) < 0) {
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save_errno = errno;
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+ warn("unix connect failed");
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close(s);
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errno = save_errno;
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return -1;
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