Репозитории ALT
| S: | 4.0.20100725-alt3 |
| 5.1: | 4.0.20061122-alt2 |
| 4.1: | 4.0.20061122-alt1 |
| 4.0: | 4.0.20061122-alt1 |
| 3.0: | 3.6-alt2 |
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Пакет: netcat
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src/ 0000755 0000000 0000000 00000000000 11500206336 0011637 5 ustar 00root root 0000000 0000000 src/usr.bin/ 0000755 0000000 0000000 00000000000 11500206336 0013217 5 ustar 00root root 0000000 0000000 src/usr.bin/nc/ 0000755 0000000 0000000 00000000000 11500206336 0013617 5 ustar 00root root 0000000 0000000 src/usr.bin/nc/Makefile 0000644 0000000 0000000 00000000177 11500206336 0015264 0 ustar 00root root 0000000 0000000 # $OpenBSD: Makefile,v 1.6 2001/09/02 18:45:41 jakob Exp $
PROG= nc
SRCS= netcat.c atomicio.c socks.c
.include <bsd.prog.mk>
src/usr.bin/nc/atomicio.c 0000644 0000000 0000000 00000004263 11500206336 0015574 0 ustar 00root root 0000000 0000000 /* $OpenBSD: atomicio.c,v 1.9 2007/09/07 14:50:44 tobias Exp $ */
/*
* Copyright (c) 2006 Damien Miller. All rights reserved.
* Copyright (c) 2005 Anil Madhavapeddy. All rights reserved.
* Copyright (c) 1995,1999 Theo de Raadt. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <errno.h>
#include <poll.h>
#include <unistd.h>
#include "atomicio.h"
/*
* ensure all of data on socket comes through. f==read || f==vwrite
*/
size_t
atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
{
char *s = _s;
size_t pos = 0;
ssize_t res;
struct pollfd pfd;
pfd.fd = fd;
pfd.events = f == read ? POLLIN : POLLOUT;
while (n > pos) {
res = (f) (fd, s + pos, n - pos);
switch (res) {
case -1:
if (errno == EINTR)
continue;
if (errno == EAGAIN) {
(void)poll(&pfd, 1, -1);
continue;
}
return 0;
case 0:
errno = EPIPE;
return pos;
default:
pos += (size_t)res;
}
}
return (pos);
}
src/usr.bin/nc/atomicio.h 0000644 0000000 0000000 00000003316 11500206336 0015577 0 ustar 00root root 0000000 0000000 /* $OpenBSD: atomicio.h,v 1.2 2007/09/07 14:50:44 tobias Exp $ */
/*
* Copyright (c) 2006 Damien Miller. All rights reserved.
* Copyright (c) 1995,1999 Theo de Raadt. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _ATOMICIO_H
#define _ATOMICIO_H
/*
* Ensure all of data on socket comes through. f==read || f==vwrite
*/
size_t atomicio(ssize_t (*)(int, void *, size_t), int, void *, size_t);
#define vwrite (ssize_t (*)(int, void *, size_t))write
#endif /* _ATOMICIO_H */
src/usr.bin/nc/nc.1 0000644 0000000 0000000 00000026125 11500206336 0014307 0 ustar 00root root 0000000 0000000 .\" $OpenBSD: nc.1,v 1.55 2010/07/25 07:51:39 guenther Exp $
.\"
.\" Copyright (c) 1996 David Sacerdote
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. The name of the author may not be used to endorse or promote products
.\" derived from this software without specific prior written permission
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd $Mdocdate: July 25 2010 $
.Dt NC 1
.Os
.Sh NAME
.Nm nc
.Nd arbitrary TCP and UDP connections and listens
.Sh SYNOPSIS
.Nm nc
.Bk -words
.Op Fl 46DdhklnrStUuvz
.Op Fl I Ar length
.Op Fl i Ar interval
.Op Fl O Ar length
.Op Fl P Ar proxy_username
.Op Fl p Ar source_port
.Op Fl s Ar source_ip_address
.Op Fl T Ar ToS
.Op Fl V Ar rtable
.Op Fl w Ar timeout
.Op Fl X Ar proxy_protocol
.Oo Xo
.Fl x Ar proxy_address Ns Oo : Ns
.Ar port Oc
.Xc Oc
.Op Ar hostname
.Op Ar port
.Ek
.Sh DESCRIPTION
The
.Nm
(or
.Nm netcat )
utility is used for just about anything under the sun involving TCP
or UDP.
It can open TCP connections, send UDP packets, listen on arbitrary
TCP and UDP ports, do port scanning, and deal with both IPv4 and
IPv6.
Unlike
.Xr telnet 1 ,
.Nm
scripts nicely, and separates error messages onto standard error instead
of sending them to standard output, as
.Xr telnet 1
does with some.
.Pp
Common uses include:
.Pp
.Bl -bullet -offset indent -compact
.It
simple TCP proxies
.It
shell-script based HTTP clients and servers
.It
network daemon testing
.It
a SOCKS or HTTP ProxyCommand for
.Xr ssh 1
.It
and much, much more
.El
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl 4
Forces
.Nm
to use IPv4 addresses only.
.It Fl 6
Forces
.Nm
to use IPv6 addresses only.
.It Fl D
Enable debugging on the socket.
.It Fl d
Do not attempt to read from stdin.
.It Fl h
Prints out
.Nm
help.
.It Fl I Ar length
Specifies the size of the TCP receive buffer.
.It Fl i Ar interval
Specifies a delay time interval between lines of text sent and received.
Also causes a delay time between connections to multiple ports.
.It Fl k
Forces
.Nm
to stay listening for another connection after its current connection
is completed.
It is an error to use this option without the
.Fl l
option.
.It Fl l
Used to specify that
.Nm
should listen for an incoming connection rather than initiate a
connection to a remote host.
It is an error to use this option in conjunction with the
.Fl p ,
.Fl s ,
or
.Fl z
options.
Additionally, any timeouts specified with the
.Fl w
option are ignored.
.It Fl n
Do not do any DNS or service lookups on any specified addresses,
hostnames or ports.
.It Fl O Ar length
Specifies the size of the TCP send buffer.
.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.
Proxy authentication is only supported for HTTP CONNECT proxies at present.
.It Fl p Ar source_port
Specifies the source port
.Nm
should use, subject to privilege restrictions and availability.
It is an error to use this option in conjunction with the
.Fl l
option.
.It Fl r
Specifies that source and/or destination ports should be chosen randomly
instead of sequentially within a range or in the order that the system
assigns them.
.It Fl S
Enables the RFC 2385 TCP MD5 signature option.
.It Fl s Ar source_ip_address
Specifies the IP of the interface which is used to send the packets.
It is an error to use this option in conjunction with the
.Fl l
option.
.It Fl T Ar ToS
Specifies IP Type of Service (ToS) for the connection.
Valid values are the tokens
.Dq lowdelay ,
.Dq throughput ,
.Dq reliability ,
or an 8-bit hexadecimal value preceded by
.Dq 0x .
.It Fl t
Causes
.Nm
to send RFC 854 DON'T and WON'T responses to RFC 854 DO and WILL requests.
This makes it possible to use
.Nm
to script telnet sessions.
.It Fl U
Specifies to use
.Ux Ns -domain
sockets.
.It Fl u
Use UDP instead of the default option of TCP.
.It Fl V Ar rtable
Set the routing table to be used.
The default is 0.
.It Fl v
Have
.Nm
give more verbose output.
.It Fl w Ar timeout
If a connection and stdin are idle for more than
.Ar timeout
seconds, then the connection is silently closed.
The
.Fl w
flag has no effect on the
.Fl l
option, i.e.\&
.Nm
will listen forever for a connection, with or without the
.Fl w
flag.
The default is no timeout.
.It Fl X Ar proxy_protocol
Requests that
.Nm
should use the specified protocol when talking to the proxy server.
Supported protocols are
.Dq 4
(SOCKS v.4),
.Dq 5
(SOCKS v.5)
and
.Dq connect
(HTTPS proxy).
If the protocol is not specified, SOCKS version 5 is used.
.It Xo
.Fl x Ar proxy_address Ns Oo : Ns
.Ar port Oc
.Xc
Requests that
.Nm
should connect to
.Ar hostname
using a proxy at
.Ar proxy_address
and
.Ar port .
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
Specifies that
.Nm
should just scan for listening daemons, without sending any data to them.
It is an error to use this option in conjunction with the
.Fl l
option.
.El
.Pp
.Ar hostname
can be a numerical IP address or a symbolic hostname
(unless the
.Fl n
option is given).
In general, a hostname must be specified,
unless the
.Fl l
option is given
(in which case the local host is used).
.Pp
.Ar port
can be a single integer or a range of ports.
Ranges are in the form nn-mm.
In general,
a destination port must be specified,
unless the
.Fl U
option is given
(in which case a socket must be specified).
.Sh CLIENT/SERVER MODEL
It is quite simple to build a very basic client/server model using
.Nm .
On one console, start
.Nm
listening on a specific port for a connection.
For example:
.Pp
.Dl $ nc -l 1234
.Pp
.Nm
is now listening on port 1234 for a connection.
On a second console
.Pq or a second machine ,
connect to the machine and port being listened on:
.Pp
.Dl $ nc 127.0.0.1 1234
.Pp
There should now be a connection between the ports.
Anything typed at the second console will be concatenated to the first,
and vice-versa.
After the connection has been set up,
.Nm
does not really care which side is being used as a
.Sq server
and which side is being used as a
.Sq client .
The connection may be terminated using an
.Dv EOF
.Pq Sq ^D .
.Sh DATA TRANSFER
The example in the previous section can be expanded to build a
basic data transfer model.
Any information input into one end of the connection will be output
to the other end, and input and output can be easily captured in order to
emulate file transfer.
.Pp
Start by using
.Nm
to listen on a specific port, with output captured into a file:
.Pp
.Dl $ nc -l 1234 \*(Gt filename.out
.Pp
Using a second machine, connect to the listening
.Nm
process, feeding it the file which is to be transferred:
.Pp
.Dl $ nc host.example.com 1234 \*(Lt filename.in
.Pp
After the file has been transferred, the connection will close automatically.
.Sh TALKING TO SERVERS
It is sometimes useful to talk to servers
.Dq by hand
rather than through a user interface.
It can aid in troubleshooting,
when it might be necessary to verify what data a server is sending
in response to commands issued by the client.
For example, to retrieve the home page of a web site:
.Bd -literal -offset indent
$ printf "GET / HTTP/1.0\er\en\er\en" | nc host.example.com 80
.Ed
.Pp
Note that this also displays the headers sent by the web server.
They can be filtered, using a tool such as
.Xr sed 1 ,
if necessary.
.Pp
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
HELO host.example.com
MAIL FROM:\*(Ltuser@host.example.com\*(Gt
RCPT TO:\*(Ltuser2@host.example.com\*(Gt
DATA
Body of email.
\&.
QUIT
EOF
.Ed
.Sh PORT SCANNING
It may be useful to know which ports are open and running services on
a target machine.
The
.Fl z
flag can be used to tell
.Nm
to report open ports,
rather than initiate a connection.
For example:
.Bd -literal -offset indent
$ nc -z 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.
.Pp
Alternatively, it might be useful to know which server software
is running, and which versions.
This information is often contained within the greeting banners.
In order to retrieve these, it is necessary to first make a connection,
and then break the connection when the banner has been retrieved.
This can be accomplished by specifying a small timeout with the
.Fl w
flag, or perhaps by issuing a
.Qq Dv QUIT
command to the server:
.Bd -literal -offset indent
$ echo "QUIT" | nc host.example.com 20-30
SSH-1.99-OpenSSH_3.6.1p2
Protocol mismatch.
220 host.example.com IMS SMTP Receiver Version 0.84 Ready
.Ed
.Sh EXAMPLES
Open a TCP connection to port 42 of host.example.com, using port 31337 as
the source port, with a timeout of 5 seconds:
.Pp
.Dl $ nc -p 31337 -w 5 host.example.com 42
.Pp
Open a UDP connection to port 53 of host.example.com:
.Pp
.Dl $ nc -u host.example.com 53
.Pp
Open a TCP connection to port 42 of host.example.com using 10.1.2.3 as the
IP for the local end of the connection:
.Pp
.Dl $ nc -s 10.1.2.3 host.example.com 42
.Pp
Create and listen on a
.Ux Ns -domain
socket:
.Pp
.Dl $ nc -lU /var/tmp/dsocket
.Pp
Connect to port 42 of host.example.com via an HTTP proxy at 10.2.3.4,
port 8080.
This example could also be used by
.Xr ssh 1 ;
see the
.Cm ProxyCommand
directive in
.Xr ssh_config 5
for more information.
.Pp
.Dl $ nc -x10.2.3.4:8080 -Xconnect host.example.com 42
.Pp
The same example again, this time enabling proxy authentication with username
.Dq ruser
if the proxy requires it:
.Pp
.Dl $ nc -x10.2.3.4:8080 -Xconnect -Pruser host.example.com 42
.Sh SEE ALSO
.Xr cat 1 ,
.Xr ssh 1
.Sh AUTHORS
Original implementation by *Hobbit*
.Aq hobbit@avian.org .
.br
Rewritten with IPv6 support by
.An Eric Jackson Aq ericj@monkey.org .
.Sh CAVEATS
UDP port scans will always succeed
(i.e. report the port as open),
rendering the
.Fl uz
combination of flags relatively useless.
src/usr.bin/nc/netcat.c 0000644 0000000 0000000 00000047107 11500206336 0015252 0 ustar 00root root 0000000 0000000 /* $OpenBSD: netcat.c,v 1.98 2010/07/03 04:44:51 guenther Exp $ */
/*
* Copyright (c) 2001 Eric Jackson <ericj@monkey.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Re-written nc(1) for OpenBSD. Original implementation by
* *Hobbit* <hobbit@avian.org>.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/tcp.h>
#include <netinet/ip.h>
#include <arpa/telnet.h>
#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <poll.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <limits.h>
#include "atomicio.h"
#ifndef SUN_LEN
#define SUN_LEN(su) \
(sizeof(*(su)) - sizeof((su)->sun_path) + strlen((su)->sun_path))
#endif
#define PORT_MAX 65535
#define PORT_MAX_LEN 6
/* Command Line Options */
int dflag; /* detached, no stdin */
unsigned int iflag; /* Interval Flag */
int jflag; /* use jumbo frames if we can */
int kflag; /* More than one connect */
int lflag; /* Bind to local port */
int nflag; /* Don't do name look up */
char *Pflag; /* Proxy username */
char *pflag; /* Localport flag */
int rflag; /* Random ports flag */
char *sflag; /* Source Address */
int tflag; /* Telnet Emulation */
int uflag; /* UDP - Default to TCP */
int vflag; /* Verbosity */
int xflag; /* Socks proxy */
int zflag; /* Port Scan Flag */
int Dflag; /* sodebug */
int Iflag; /* TCP receive buffer size */
int Oflag; /* TCP send buffer size */
int Sflag; /* TCP MD5 signature option */
int Tflag = -1; /* IP Type of Service */
u_int rtableid;
int timeout = -1;
int family = AF_UNSPEC;
char *portlist[PORT_MAX+1];
void atelnet(int, unsigned char *, unsigned int);
void build_ports(char *);
void help(void);
int local_listen(char *, char *, struct addrinfo);
void readwrite(int);
int remote_connect(const char *, const char *, struct addrinfo);
int socks_connect(const char *, const char *, struct addrinfo,
const char *, const char *, struct addrinfo, int, const char *);
int udptest(int);
int unix_connect(char *);
int unix_listen(char *);
void set_common_sockopts(int);
int parse_iptos(char *);
void usage(int);
int
main(int argc, char *argv[])
{
int ch, s, ret, socksv;
char *host, *uport;
struct addrinfo hints;
struct servent *sv;
socklen_t len;
struct sockaddr_storage cliaddr;
char *proxy;
const char *errstr, *proxyhost = "", *proxyport = NULL;
struct addrinfo proxyhints;
ret = 1;
s = 0;
socksv = 5;
host = NULL;
uport = NULL;
sv = NULL;
while ((ch = getopt(argc, argv,
"46DdhI:i:jklnO:P:p:rSs:tT:UuV:vw:X:x:z")) != -1) {
switch (ch) {
case '4':
family = AF_INET;
break;
case '6':
family = AF_INET6;
break;
case 'U':
family = AF_UNIX;
break;
case 'X':
if (strcasecmp(optarg, "connect") == 0)
socksv = -1; /* HTTP proxy CONNECT */
else if (strcmp(optarg, "4") == 0)
socksv = 4; /* SOCKS v.4 */
else if (strcmp(optarg, "5") == 0)
socksv = 5; /* SOCKS v.5 */
else
errx(1, "unsupported proxy protocol");
break;
case 'd':
dflag = 1;
break;
case 'h':
help();
break;
case 'i':
iflag = strtonum(optarg, 0, UINT_MAX, &errstr);
if (errstr)
errx(1, "interval %s: %s", errstr, optarg);
break;
case 'j':
jflag = 1;
break;
case 'k':
kflag = 1;
break;
case 'l':
lflag = 1;
break;
case 'n':
nflag = 1;
break;
case 'P':
Pflag = optarg;
break;
case 'p':
pflag = optarg;
break;
case 'r':
rflag = 1;
break;
case 's':
sflag = optarg;
break;
case 't':
tflag = 1;
break;
case 'u':
uflag = 1;
break;
case 'V':
rtableid = (unsigned int)strtonum(optarg, 0,
RT_TABLEID_MAX, &errstr);
if (errstr)
errx(1, "rtable %s: %s", errstr, optarg);
break;
case 'v':
vflag = 1;
break;
case 'w':
timeout = strtonum(optarg, 0, INT_MAX / 1000, &errstr);
if (errstr)
errx(1, "timeout %s: %s", errstr, optarg);
timeout *= 1000;
break;
case 'x':
xflag = 1;
if ((proxy = strdup(optarg)) == NULL)
err(1, NULL);
break;
case 'z':
zflag = 1;
break;
case 'D':
Dflag = 1;
break;
case 'I':
Iflag = strtonum(optarg, 1, 65536 << 14, &errstr);
if (errstr != NULL)
errx(1, "TCP receive window %s: %s",
errstr, optarg);
break;
case 'O':
Oflag = strtonum(optarg, 1, 65536 << 14, &errstr);
if (errstr != NULL)
errx(1, "TCP send window %s: %s",
errstr, optarg);
break;
case 'S':
Sflag = 1;
break;
case 'T':
Tflag = parse_iptos(optarg);
break;
default:
usage(1);
}
}
argc -= optind;
argv += optind;
/* 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");
host = argv[0];
uport = NULL;
} else if (argv[0] && !argv[1]) {
if (!lflag)
usage(1);
uport = argv[0];
host = NULL;
} else if (argv[0] && argv[1]) {
host = argv[0];
uport = argv[1];
} else
usage(1);
if (lflag && sflag)
errx(1, "cannot use -s and -l");
if (lflag && pflag)
errx(1, "cannot use -p and -l");
if (lflag && zflag)
errx(1, "cannot use -z and -l");
if (!lflag && kflag)
errx(1, "must use -l with -k");
/* Initialize addrinfo structure. */
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 (nflag)
hints.ai_flags |= AI_NUMERICHOST;
}
if (xflag) {
if (uflag)
errx(1, "no proxy support for UDP mode");
if (lflag)
errx(1, "no proxy support for listen");
if (family == AF_UNIX)
errx(1, "no proxy support for unix sockets");
/* XXX IPv6 transport to proxy would probably work */
if (family == AF_INET6)
errx(1, "no proxy support for IPv6");
if (sflag)
errx(1, "no proxy support for local source address");
proxyhost = strsep(&proxy, ":");
proxyport = proxy;
memset(&proxyhints, 0, sizeof(struct addrinfo));
proxyhints.ai_family = family;
proxyhints.ai_socktype = SOCK_STREAM;
proxyhints.ai_protocol = IPPROTO_TCP;
if (nflag)
proxyhints.ai_flags |= AI_NUMERICHOST;
}
if (lflag) {
int connfd;
ret = 0;
if (family == AF_UNIX)
s = unix_listen(host);
/* Allow only one connection at a time, but stay alive. */
for (;;) {
if (family != AF_UNIX)
s = local_listen(host, uport, hints);
if (s < 0)
err(1, NULL);
/*
* For UDP, we will use recvfrom() initially
* to wait for a caller, then use the regular
* functions to talk to the caller.
*/
if (uflag) {
int rv, plen;
char buf[16384];
struct sockaddr_storage z;
len = sizeof(z);
plen = jflag ? 16384 : 2048;
rv = recvfrom(s, buf, plen, MSG_PEEK,
(struct sockaddr *)&z, &len);
if (rv < 0)
err(1, "recvfrom");
rv = connect(s, (struct sockaddr *)&z, len);
if (rv < 0)
err(1, "connect");
connfd = s;
} else {
len = sizeof(cliaddr);
connfd = accept(s, (struct sockaddr *)&cliaddr,
&len);
}
readwrite(connfd);
close(connfd);
if (family != AF_UNIX)
close(s);
if (!kflag)
break;
}
} else if (family == AF_UNIX) {
ret = 0;
if ((s = unix_connect(host)) > 0 && !zflag) {
readwrite(s);
close(s);
} else
ret = 1;
exit(ret);
} else {
int i = 0;
/* Construct the portlist[] array. */
build_ports(uport);
/* Cycle through portlist, connecting to each port. */
for (i = 0; portlist[i] != NULL; i++) {
if (s)
close(s);
if (xflag)
s = socks_connect(host, portlist[i], hints,
proxyhost, proxyport, proxyhints, socksv,
Pflag);
else
s = remote_connect(host, portlist[i], hints);
if (s < 0)
continue;
ret = 0;
if (vflag || zflag) {
/* For UDP, make sure we are connected. */
if (uflag) {
if (udptest(s) == -1) {
ret = 1;
continue;
}
}
/* Don't look up port if -n. */
if (nflag)
sv = NULL;
else {
sv = getservbyport(
ntohs(atoi(portlist[i])),
uflag ? "udp" : "tcp");
}
fprintf(stderr,
"Connection to %s %s port [%s/%s] "
"succeeded!\n", host, portlist[i],
uflag ? "udp" : "tcp",
sv ? sv->s_name : "*");
}
if (!zflag)
readwrite(s);
}
}
if (s)
close(s);
exit(ret);
}
/*
* unix_connect()
* Returns a socket connected to a local unix socket. Returns -1 on failure.
*/
int
unix_connect(char *path)
{
struct sockaddr_un sun;
int s;
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
return (-1);
(void)fcntl(s, F_SETFD, 1);
memset(&sun, 0, sizeof(struct sockaddr_un));
sun.sun_family = AF_UNIX;
if (strlcpy(sun.sun_path, path, sizeof(sun.sun_path)) >=
sizeof(sun.sun_path)) {
close(s);
errno = ENAMETOOLONG;
return (-1);
}
if (connect(s, (struct sockaddr *)&sun, SUN_LEN(&sun)) < 0) {
close(s);
return (-1);
}
return (s);
}
/*
* unix_listen()
* Create a unix domain socket, and listen on it.
*/
int
unix_listen(char *path)
{
struct sockaddr_un sun;
int s;
/* Create unix domain socket. */
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
return (-1);
memset(&sun, 0, sizeof(struct sockaddr_un));
sun.sun_family = AF_UNIX;
if (strlcpy(sun.sun_path, path, sizeof(sun.sun_path)) >=
sizeof(sun.sun_path)) {
close(s);
errno = ENAMETOOLONG;
return (-1);
}
if (bind(s, (struct sockaddr *)&sun, SUN_LEN(&sun)) < 0) {
close(s);
return (-1);
}
if (listen(s, 5) < 0) {
close(s);
return (-1);
}
return (s);
}
/*
* remote_connect()
* Returns a socket connected to a remote host. Properly binds to a local
* port or source address if needed. Returns -1 on failure.
*/
int
remote_connect(const char *host, const char *port, struct addrinfo hints)
{
struct addrinfo *res, *res0;
int s, error, on = 1;
if ((error = getaddrinfo(host, port, &hints, &res)))
errx(1, "getaddrinfo: %s", gai_strerror(error));
res0 = res;
do {
if ((s = socket(res0->ai_family, res0->ai_socktype,
res0->ai_protocol)) < 0)
continue;
if (rtableid) {
if (setsockopt(s, IPPROTO_IP, SO_RTABLE, &rtableid,
sizeof(rtableid)) == -1)
err(1, "setsockopt SO_RTABLE");
}
/* Bind to a local port or source address if specified. */
if (sflag || pflag) {
struct addrinfo ahints, *ares;
/* try SO_BINDANY, but don't insist */
setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
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;
ahints.ai_flags = AI_PASSIVE;
if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
errx(1, "getaddrinfo: %s", gai_strerror(error));
if (bind(s, (struct sockaddr *)ares->ai_addr,
ares->ai_addrlen) < 0)
errx(1, "bind failed: %s", strerror(errno));
freeaddrinfo(ares);
}
set_common_sockopts(s);
if (connect(s, res0->ai_addr, res0->ai_addrlen) == 0)
break;
else if (vflag)
warn("connect to %s port %s (%s) failed", host, port,
uflag ? "udp" : "tcp");
close(s);
s = -1;
} while ((res0 = res0->ai_next) != NULL);
freeaddrinfo(res);
return (s);
}
/*
* local_listen()
* Returns a socket listening on a local port, binds to specified source
* address. Returns -1 on failure.
*/
int
local_listen(char *host, char *port, struct addrinfo hints)
{
struct addrinfo *res, *res0;
int s, ret, x = 1;
int error;
/* Allow nodename to be null. */
hints.ai_flags |= AI_PASSIVE;
/*
* In the case of binding to a wildcard address
* default to binding to an ipv4 address.
*/
if (host == NULL && hints.ai_family == AF_UNSPEC)
hints.ai_family = AF_INET;
if ((error = getaddrinfo(host, port, &hints, &res)))
errx(1, "getaddrinfo: %s", gai_strerror(error));
res0 = res;
do {
if ((s = socket(res0->ai_family, res0->ai_socktype,
res0->ai_protocol)) < 0)
continue;
if (rtableid) {
if (setsockopt(s, IPPROTO_IP, SO_RTABLE, &rtableid,
sizeof(rtableid)) == -1)
err(1, "setsockopt SO_RTABLE");
}
ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
if (ret == -1)
err(1, NULL);
set_common_sockopts(s);
if (bind(s, (struct sockaddr *)res0->ai_addr,
res0->ai_addrlen) == 0)
break;
close(s);
s = -1;
} while ((res0 = res0->ai_next) != NULL);
if (!uflag && s != -1) {
if (listen(s, 1) < 0)
err(1, "listen");
}
freeaddrinfo(res);
return (s);
}
/*
* readwrite()
* Loop that polls on the network file descriptor and stdin.
*/
void
readwrite(int nfd)
{
struct pollfd pfd[2];
unsigned char buf[16384];
int n, wfd = fileno(stdin);
int lfd = fileno(stdout);
int plen;
plen = jflag ? 16384 : 2048;
/* Setup Network FD */
pfd[0].fd = nfd;
pfd[0].events = POLLIN;
/* Set up STDIN FD. */
pfd[1].fd = wfd;
pfd[1].events = POLLIN;
while (pfd[0].fd != -1) {
if (iflag)
sleep(iflag);
if ((n = poll(pfd, 2 - dflag, timeout)) < 0) {
close(nfd);
err(1, "Polling Error");
}
if (n == 0)
return;
if (pfd[0].revents & POLLIN) {
if ((n = read(nfd, buf, plen)) < 0)
return;
else if (n == 0) {
shutdown(nfd, SHUT_RD);
pfd[0].fd = -1;
pfd[0].events = 0;
} else {
if (tflag)
atelnet(nfd, buf, n);
if (atomicio(vwrite, lfd, buf, n) != n)
return;
}
}
if (!dflag && 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;
} else {
if (atomicio(vwrite, nfd, buf, n) != n)
return;
}
}
}
}
/* Deal with RFC 854 WILL/WONT DO/DONT negotiation. */
void
atelnet(int nfd, unsigned char *buf, unsigned int size)
{
unsigned char *p, *end;
unsigned char obuf[4];
if (size < 3)
return;
end = buf + size - 2;
for (p = buf; p < end; p++) {
if (*p != IAC)
continue;
obuf[0] = IAC;
p++;
if ((*p == WILL) || (*p == WONT))
obuf[1] = DONT;
else if ((*p == DO) || (*p == DONT))
obuf[1] = WONT;
else
continue;
p++;
obuf[2] = *p;
if (atomicio(vwrite, nfd, obuf, 3) != 3)
warn("Write Error!");
}
}
/*
* build_ports()
* Build an array or ports in portlist[], listing each port
* that we should try to connect to.
*/
void
build_ports(char *p)
{
const char *errstr;
char *n;
int hi, lo, cp;
int x = 0;
if ((n = strchr(p, '-')) != NULL) {
if (lflag)
errx(1, "Cannot use -l with multiple ports!");
*n = '\0';
n++;
/* Make sure the ports are in order: lowest->highest. */
hi = strtonum(n, 1, PORT_MAX, &errstr);
if (errstr)
errx(1, "port number %s: %s", errstr, n);
lo = strtonum(p, 1, PORT_MAX, &errstr);
if (errstr)
errx(1, "port number %s: %s", errstr, p);
if (lo > hi) {
cp = hi;
hi = lo;
lo = cp;
}
/* Load ports sequentially. */
for (cp = lo; cp <= hi; cp++) {
portlist[x] = calloc(1, PORT_MAX_LEN);
if (portlist[x] == NULL)
err(1, NULL);
snprintf(portlist[x], PORT_MAX_LEN, "%d", cp);
x++;
}
/* Randomly swap ports. */
if (rflag) {
int y;
char *c;
for (x = 0; x <= (hi - lo); x++) {
y = (arc4random() & 0xFFFF) % (hi - lo);
c = portlist[x];
portlist[x] = portlist[y];
portlist[y] = c;
}
}
} else {
hi = strtonum(p, 1, PORT_MAX, &errstr);
if (errstr)
errx(1, "port number %s: %s", errstr, p);
portlist[0] = strdup(p);
if (portlist[0] == NULL)
err(1, NULL);
}
}
/*
* udptest()
* Do a few writes to see if the UDP port is there.
* XXX - Better way of doing this? Doesn't work for IPv6.
* Also fails after around 100 ports checked.
*/
int
udptest(int s)
{
int i, ret;
for (i = 0; i <= 3; i++) {
if (write(s, "X", 1) == 1)
ret = 1;
else
ret = -1;
}
return (ret);
}
void
set_common_sockopts(int s)
{
int x = 1;
if (Sflag) {
if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
&x, sizeof(x)) == -1)
err(1, NULL);
}
if (Dflag) {
if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
&x, sizeof(x)) == -1)
err(1, NULL);
}
if (jflag) {
if (setsockopt(s, SOL_SOCKET, SO_JUMBO,
&x, sizeof(x)) == -1)
err(1, NULL);
}
if (Tflag != -1) {
if (setsockopt(s, IPPROTO_IP, IP_TOS,
&Tflag, sizeof(Tflag)) == -1)
err(1, "set IP ToS");
}
if (Iflag) {
if (setsockopt(s, SOL_SOCKET, SO_RCVBUF,
&Iflag, sizeof(Iflag)) == -1)
err(1, "set TCP receive buffer size");
}
if (Oflag) {
if (setsockopt(s, SOL_SOCKET, SO_SNDBUF,
&Oflag, sizeof(Oflag)) == -1)
err(1, "set TCP send buffer size");
}
}
int
parse_iptos(char *s)
{
int tos = -1;
if (strcmp(s, "lowdelay") == 0)
return (IPTOS_LOWDELAY);
if (strcmp(s, "throughput") == 0)
return (IPTOS_THROUGHPUT);
if (strcmp(s, "reliability") == 0)
return (IPTOS_RELIABILITY);
if (sscanf(s, "0x%x", &tos) != 1 || tos < 0 || tos > 0xff)
errx(1, "invalid IP Type of Service");
return (tos);
}
void
help(void)
{
usage(0);
fprintf(stderr, "\tCommand Summary:\n\
\t-4 Use IPv4\n\
\t-6 Use IPv6\n\
\t-D Enable the debug socket option\n\
\t-d Detach from stdin\n\
\t-h This help text\n\
\t-I length TCP receive buffer length\n\
\t-i secs\t Delay interval for lines sent, ports scanned\n\
\t-k Keep inbound sockets open for multiple connects\n\
\t-l Listen mode, for inbound connects\n\
\t-n Suppress name/port resolutions\n\
\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-r Randomize remote ports\n\
\t-S Enable the TCP MD5 signature option\n\
\t-s addr\t Local source address\n\
\t-T ToS\t Set IP Type of Service\n\
\t-t Answer TELNET negotiation\n\
\t-U Use UNIX domain socket\n\
\t-u UDP mode\n\
\t-V rtable Specify alternate routing table\n\
\t-v Verbose\n\
\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 Zero-I/O mode [used for scanning]\n\
Port numbers can be individual or ranges: lo-hi [inclusive]\n");
exit(1);
}
void
usage(int ret)
{
fprintf(stderr,
"usage: nc [-46DdhklnrStUuvz] [-I length] [-i interval] [-O length]\n"
"\t [-P proxy_username] [-p source_port] [-s source_ip_address] [-T ToS]\n"
"\t [-V rtable] [-w timeout] [-X proxy_protocol]\n"
"\t [-x proxy_address[:port]] [hostname] [port]\n");
if (ret)
exit(1);
}
src/usr.bin/nc/socks.c 0000644 0000000 0000000 00000022367 11500206336 0015117 0 ustar 00root root 0000000 0000000 /* $OpenBSD: socks.c,v 1.18 2010/04/20 07:26:35 nicm Exp $ */
/*
* Copyright (c) 1999 Niklas Hallqvist. All rights reserved.
* Copyright (c) 2004, 2005 Damien Miller. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <resolv.h>
#include <readpassphrase.h>
#include "atomicio.h"
#define SOCKS_PORT "1080"
#define HTTP_PROXY_PORT "3128"
#define HTTP_MAXHDRS 64
#define SOCKS_V5 5
#define SOCKS_V4 4
#define SOCKS_NOAUTH 0
#define SOCKS_NOMETHOD 0xff
#define SOCKS_CONNECT 1
#define SOCKS_IPV4 1
#define SOCKS_DOMAIN 3
#define SOCKS_IPV6 4
int remote_connect(const char *, const char *, struct addrinfo);
int socks_connect(const char *, const char *, struct addrinfo,
const char *, const char *, struct addrinfo, int,
const char *);
static int
decode_addrport(const char *h, const char *p, struct sockaddr *addr,
socklen_t addrlen, int v4only, int numeric)
{
int r;
struct addrinfo hints, *res;
bzero(&hints, sizeof(hints));
hints.ai_family = v4only ? PF_INET : PF_UNSPEC;
hints.ai_flags = numeric ? AI_NUMERICHOST : 0;
hints.ai_socktype = SOCK_STREAM;
r = getaddrinfo(h, p, &hints, &res);
/* Don't fatal when attempting to convert a numeric address */
if (r != 0) {
if (!numeric) {
errx(1, "getaddrinfo(\"%.64s\", \"%.64s\"): %s", h, p,
gai_strerror(r));
}
return (-1);
}
if (addrlen < res->ai_addrlen) {
freeaddrinfo(res);
errx(1, "internal error: addrlen < res->ai_addrlen");
}
memcpy(addr, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
return (0);
}
static int
proxy_read_line(int fd, char *buf, size_t bufsz)
{
size_t off;
for(off = 0;;) {
if (off >= bufsz)
errx(1, "proxy read too long");
if (atomicio(read, fd, buf + off, 1) != 1)
err(1, "proxy read");
/* Skip CR */
if (buf[off] == '\r')
continue;
if (buf[off] == '\n') {
buf[off] = '\0';
break;
}
off++;
}
return (off);
}
static const char *
getproxypass(const char *proxyuser, const char *proxyhost)
{
char prompt[512];
static char pw[256];
snprintf(prompt, sizeof(prompt), "Proxy password for %s@%s: ",
proxyuser, proxyhost);
if (readpassphrase(prompt, pw, sizeof(pw), RPP_REQUIRE_TTY) == NULL)
errx(1, "Unable to read proxy passphrase");
return (pw);
}
int
socks_connect(const char *host, const char *port,
struct addrinfo hints __attribute__ ((__unused__)),
const char *proxyhost, const char *proxyport, struct addrinfo proxyhints,
int socksv, const char *proxyuser)
{
int proxyfd, r, authretry = 0;
size_t hlen, wlen;
unsigned char buf[1024];
size_t cnt;
struct sockaddr_storage addr;
struct sockaddr_in *in4 = (struct sockaddr_in *)&addr;
struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)&addr;
in_port_t serverport;
const char *proxypass = NULL;
if (proxyport == NULL)
proxyport = (socksv == -1) ? HTTP_PROXY_PORT : SOCKS_PORT;
/* Abuse API to lookup port */
if (decode_addrport("0.0.0.0", port, (struct sockaddr *)&addr,
sizeof(addr), 1, 1) == -1)
errx(1, "unknown port \"%.64s\"", port);
serverport = in4->sin_port;
again:
if (authretry++ > 3)
errx(1, "Too many authentication failures");
proxyfd = remote_connect(proxyhost, proxyport, proxyhints);
if (proxyfd < 0)
return (-1);
if (socksv == 5) {
if (decode_addrport(host, port, (struct sockaddr *)&addr,
sizeof(addr), 0, 1) == -1)
addr.ss_family = 0; /* used in switch below */
/* Version 5, one method: no authentication */
buf[0] = SOCKS_V5;
buf[1] = 1;
buf[2] = SOCKS_NOAUTH;
cnt = atomicio(vwrite, proxyfd, buf, 3);
if (cnt != 3)
err(1, "write failed (%zu/3)", cnt);
cnt = atomicio(read, proxyfd, buf, 2);
if (cnt != 2)
err(1, "read failed (%zu/3)", cnt);
if (buf[1] == SOCKS_NOMETHOD)
errx(1, "authentication method negotiation failed");
switch (addr.ss_family) {
case 0:
/* Version 5, connect: domain name */
/* Max domain name length is 255 bytes */
hlen = strlen(host);
if (hlen > 255)
errx(1, "host name too long for SOCKS5");
buf[0] = SOCKS_V5;
buf[1] = SOCKS_CONNECT;
buf[2] = 0;
buf[3] = SOCKS_DOMAIN;
buf[4] = hlen;
memcpy(buf + 5, host, hlen);
memcpy(buf + 5 + hlen, &serverport, sizeof serverport);
wlen = 7 + hlen;
break;
case AF_INET:
/* Version 5, connect: IPv4 address */
buf[0] = SOCKS_V5;
buf[1] = SOCKS_CONNECT;
buf[2] = 0;
buf[3] = SOCKS_IPV4;
memcpy(buf + 4, &in4->sin_addr, sizeof in4->sin_addr);
memcpy(buf + 8, &in4->sin_port, sizeof in4->sin_port);
wlen = 10;
break;
case AF_INET6:
/* Version 5, connect: IPv6 address */
buf[0] = SOCKS_V5;
buf[1] = SOCKS_CONNECT;
buf[2] = 0;
buf[3] = SOCKS_IPV6;
memcpy(buf + 4, &in6->sin6_addr, sizeof in6->sin6_addr);
memcpy(buf + 20, &in6->sin6_port,
sizeof in6->sin6_port);
wlen = 22;
break;
default:
errx(1, "internal error: silly AF");
}
cnt = atomicio(vwrite, proxyfd, buf, wlen);
if (cnt != wlen)
err(1, "write failed (%zu/%zu)", cnt, wlen);
cnt = atomicio(read, proxyfd, buf, 10);
if (cnt != 10)
err(1, "read failed (%zu/10)", cnt);
if (buf[1] != 0)
errx(1, "connection failed, SOCKS error %d", buf[1]);
} else if (socksv == 4) {
/* This will exit on lookup failure */
decode_addrport(host, port, (struct sockaddr *)&addr,
sizeof(addr), 1, 0);
/* Version 4 */
buf[0] = SOCKS_V4;
buf[1] = SOCKS_CONNECT; /* connect */
memcpy(buf + 2, &in4->sin_port, sizeof in4->sin_port);
memcpy(buf + 4, &in4->sin_addr, sizeof in4->sin_addr);
buf[8] = 0; /* empty username */
wlen = 9;
cnt = atomicio(vwrite, proxyfd, buf, wlen);
if (cnt != wlen)
err(1, "write failed (%zu/%zu)", cnt, wlen);
cnt = atomicio(read, proxyfd, buf, 8);
if (cnt != 8)
err(1, "read failed (%zu/8)", cnt);
if (buf[1] != 90)
errx(1, "connection failed, SOCKS error %d", buf[1]);
} else if (socksv == -1) {
/* HTTP proxy CONNECT */
/* Disallow bad chars in hostname */
if (strcspn(host, "\r\n\t []:") != strlen(host))
errx(1, "Invalid hostname");
/* Try to be sane about numeric IPv6 addresses */
if (strchr(host, ':') != NULL) {
r = snprintf(buf, sizeof(buf),
"CONNECT [%s]:%d HTTP/1.0\r\n",
host, ntohs(serverport));
} else {
r = snprintf(buf, sizeof(buf),
"CONNECT %s:%d HTTP/1.0\r\n",
host, ntohs(serverport));
}
if (r == -1 || (size_t)r >= sizeof(buf))
errx(1, "hostname too long");
r = strlen(buf);
cnt = atomicio(vwrite, proxyfd, buf, r);
if (cnt != r)
err(1, "write failed (%zu/%d)", cnt, r);
if (authretry > 1) {
char resp[1024];
proxypass = getproxypass(proxyuser, proxyhost);
r = snprintf(buf, sizeof(buf), "%s:%s",
proxyuser, proxypass);
if (r == -1 || (size_t)r >= sizeof(buf) ||
b64_ntop(buf, strlen(buf), resp,
sizeof(resp)) == -1)
errx(1, "Proxy username/password too long");
r = snprintf(buf, sizeof(buf), "Proxy-Authorization: "
"Basic %s\r\n", resp);
if (r == -1 || (size_t)r >= sizeof(buf))
errx(1, "Proxy auth response too long");
r = strlen(buf);
if ((cnt = atomicio(vwrite, proxyfd, buf, r)) != r)
err(1, "write failed (%zu/%d)", cnt, r);
}
/* Terminate headers */
if ((r = atomicio(vwrite, proxyfd, "\r\n", 2)) != 2)
err(1, "write failed (2/%d)", r);
/* Read status reply */
proxy_read_line(proxyfd, buf, sizeof(buf));
if (proxyuser != NULL &&
strncmp(buf, "HTTP/1.0 407 ", 12) == 0) {
if (authretry > 1) {
fprintf(stderr, "Proxy authentication "
"failed\n");
}
close(proxyfd);
goto again;
} else if (strncmp(buf, "HTTP/1.0 200 ", 12) != 0 &&
strncmp(buf, "HTTP/1.1 200 ", 12) != 0)
errx(1, "Proxy error: \"%s\"", buf);
/* Headers continue until we hit an empty line */
for (r = 0; r < HTTP_MAXHDRS; r++) {
proxy_read_line(proxyfd, buf, sizeof(buf));
if (*buf == '\0')
break;
}
if (*buf != '\0')
errx(1, "Too many proxy headers received");
} else
errx(1, "Unknown proxy protocol %d", socksv);
return (proxyfd);
}