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Import netcat from OpenBSD 3.9-RELEASE.

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This commit is contained in:
Xin LI 2006-05-21 15:49:27 +00:00
parent 8c384020b3
commit 7a997a696b
5 changed files with 394 additions and 193 deletions
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28
contrib/netcat/atomicio.c
View File

@ -1,4 +1,7 @@
/* $OpenBSD: atomicio.c,v 1.8 2006/02/11 19:31:18 otto Exp $ */
/*
* Copyright (c) 2005 Anil Madhavapeddy. All rights served.
* Copyright (c) 1995,1999 Theo de Raadt. All rights reserved.
* All rights reserved.
*
@ -25,20 +28,23 @@
#include <sys/types.h>
#include <sys/uio.h>
#include <errno.h>
#include <unistd.h>
ssize_t atomicio(ssize_t (*f)(int, void *, size_t), int fd, void *_s, size_t n);
#include "atomicio.h"
/*
* ensure all of data on socket comes through. f==read || f==write
* ensure all of data on socket comes through. f==read || f==vwrite
*/
ssize_t
atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
size_t
atomicio(f, fd, _s, n)
ssize_t (*f) (int, void *, size_t);
int fd;
void *_s;
size_t n;
{
char *s = _s;
ssize_t res, pos = 0;
size_t pos = 0;
ssize_t res;
while (n > pos) {
res = (f) (fd, s + pos, n - pos);
@ -46,11 +52,13 @@ atomicio(ssize_t (*f) (int, void *, size_t), int fd, void *_s, size_t n)
case -1:
if (errno == EINTR || errno == EAGAIN)
continue;
return 0;
case 0:
return (res);
errno = EPIPE;
return pos;
default:
pos += res;
pos += (size_t)res;
}
}
return (pos);
return pos;
}

33
contrib/netcat/atomicio.h Normal file
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@ -0,0 +1,33 @@
/* $OpenBSD: atomicio.h,v 1.1 2005/05/24 20:13:28 avsm Exp $ */
/*
* 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.
*/
/*
* 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

77
contrib/netcat/nc.1
View File

@ -1,4 +1,4 @@
.\" $OpenBSD: nc.1,v 1.36 2005/01/07 10:11:31 jmc Exp $
.\" $OpenBSD: nc.1,v 1.43 2006/01/31 09:34:12 jmc Exp $
.\"
.\" Copyright (c) 1996 David Sacerdote
.\" All rights reserved.
@ -36,8 +36,10 @@
.Bk -words
.Op Fl 46DdhklnrStUuvz
.Op Fl i Ar interval
.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 w Ar timeout
.Op Fl X Ar proxy_protocol
.Oo Xo
@ -127,6 +129,10 @@ option are ignored.
.It Fl n
Do not do any DNS or service lookups on any specified addresses,
hostnames or ports.
.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
@ -145,6 +151,14 @@ 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
@ -174,7 +188,7 @@ will listen forever for a connection, with or without the
.Fl w
flag.
The default is no timeout.
.It Fl X Ar proxy_version
.It Fl X Ar proxy_protocol
Requests that
.Nm
should use the specified protocol when talking to the proxy server.
@ -290,8 +304,9 @@ 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:
.Pp
.Dl $ echo \&"GET\&" | nc host.example.com 80
.Bd -literal -offset indent
$ echo -n "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
@ -319,15 +334,11 @@ The
.Fl z
flag can be used to tell
.Nm
not to initiate a connection,
together with the
.Fl v
.Pq verbose
flag,
to report open ports.
to report open ports,
rather than initiate a connection.
For example:
.Bd -literal -offset indent
$ nc -vz host.example.com 20-30
$ 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
@ -351,37 +362,53 @@ Protocol mismatch.
220 host.example.com IMS SMTP Receiver Version 0.84 Ready
.Ed
.Sh EXAMPLES
Open a TCP connection to port 42 of hostname, using port 31337 as
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 hostname 42
.Dl $ nc -p 31337 -w 5 host.example.com 42
.Pp
Open a UDP connection to port 53 of hostname:
Open a UDP connection to port 53 of host.example.com:
.Pp
.Dl $ nc -u hostname 53
.Dl $ nc -u host.example.com 53
.Pp
Open a TCP connection to port 42 of example.host using 10.1.2.3 as the
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 example.host 42
.Pp
Send UDP packets to ports 20-30 of example.host, and report which ones
responded with an ICMP packet after three seconds:
.Pp
.Dl $ nc -uvz -w 3 hostname 20-30
.Dl $ nc -s 10.1.2.3 host.example.com 42
.Pp
Create and listen on a Unix Domain Socket:
.Pp
.Dl $ nc -lU /var/tmp/dsocket
.Pp
Connect to port 42 of hostname via an HTTP proxy at 10.2.3.4, port 8080:
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 hostname 42
.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 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.

151
contrib/netcat/netcat.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: netcat.c,v 1.76 2004/12/10 16:51:31 hshoexer Exp $ */
/* $OpenBSD: netcat.c,v 1.87 2006/02/01 21:33:14 otto Exp $ */
/*
* Copyright (c) 2001 Eric Jackson <ericj@monkey.org>
*
@ -37,7 +37,9 @@
#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>
@ -50,6 +52,8 @@
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <limits.h>
#include "atomicio.h"
#ifndef SUN_LEN
#define SUN_LEN(su) \
@ -62,9 +66,11 @@
/* Command Line Options */
int dflag; /* detached, no stdin */
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 */
@ -75,23 +81,25 @@ int xflag; /* Socks proxy */
int zflag; /* Port Scan Flag */
int Dflag; /* sodebug */
int Sflag; /* TCP MD5 signature option */
int Tflag = -1; /* IP Type of Service */
int timeout = -1;
int family = AF_UNSPEC;
char *portlist[PORT_MAX+1];
ssize_t atomicio(ssize_t (*)(int, void *, size_t), int, void *, size_t);
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(char *, char *, struct addrinfo);
int socks_connect(char *, char *, struct addrinfo, char *, char *,
struct addrinfo, 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
@ -104,7 +112,7 @@ main(int argc, char *argv[])
socklen_t len;
struct sockaddr_storage cliaddr;
char *proxy;
char *proxyhost = "", *proxyport = NULL;
const char *proxyhost = "", *proxyport = NULL;
struct addrinfo proxyhints;
ret = 1;
@ -115,7 +123,8 @@ main(int argc, char *argv[])
endp = NULL;
sv = NULL;
while ((ch = getopt(argc, argv, "46Ddhi:klnp:rSs:tUuvw:X:x:z")) != -1) {
while ((ch = getopt(argc, argv,
"46Ddhi:jklnP:p:rSs:tT:Uuvw:X:x:z")) != -1) {
switch (ch) {
case '4':
family = AF_INET;
@ -147,6 +156,9 @@ main(int argc, char *argv[])
if (iflag < 0 || *endp != '\0')
errx(1, "interval cannot be negative");
break;
case 'j':
jflag = 1;
break;
case 'k':
kflag = 1;
break;
@ -156,6 +168,9 @@ main(int argc, char *argv[])
case 'n':
nflag = 1;
break;
case 'P':
Pflag = optarg;
break;
case 'p':
pflag = optarg;
break;
@ -196,6 +211,9 @@ main(int argc, char *argv[])
case 'S':
Sflag = 1;
break;
case 'T':
Tflag = parse_iptos(optarg);
break;
default:
usage(1);
}
@ -286,12 +304,13 @@ main(int argc, char *argv[])
* functions to talk to the caller.
*/
if (uflag) {
int rv;
char buf[1024];
int rv, plen;
char buf[8192];
struct sockaddr_storage z;
len = sizeof(z);
rv = recvfrom(s, buf, sizeof(buf), MSG_PEEK,
plen = jflag ? 8192 : 1024;
rv = recvfrom(s, buf, plen, MSG_PEEK,
(struct sockaddr *)&z, &len);
if (rv < 0)
err(1, "recvfrom");
@ -302,6 +321,7 @@ main(int argc, char *argv[])
connfd = s;
} else {
len = sizeof(cliaddr);
connfd = accept(s, (struct sockaddr *)&cliaddr,
&len);
}
@ -338,7 +358,8 @@ main(int argc, char *argv[])
if (xflag)
s = socks_connect(host, portlist[i], hints,
proxyhost, proxyport, proxyhints, socksv);
proxyhost, proxyport, proxyhints, socksv,
Pflag);
else
s = remote_connect(host, portlist[i], hints);
@ -452,10 +473,10 @@ unix_listen(char *path)
* port or source address if needed. Returns -1 on failure.
*/
int
remote_connect(char *host, char *port, struct addrinfo hints)
remote_connect(const char *host, const char *port, struct addrinfo hints)
{
struct addrinfo *res, *res0;
int s, error, x = 1;
int s, error;
if ((error = getaddrinfo(host, port, &hints, &res)))
errx(1, "getaddrinfo: %s", gai_strerror(error));
@ -470,13 +491,6 @@ remote_connect(char *host, char *port, struct addrinfo hints)
if (sflag || pflag) {
struct addrinfo ahints, *ares;
if (!(sflag && pflag)) {
if (!sflag)
sflag = NULL;
else
pflag = NULL;
}
memset(&ahints, 0, sizeof(struct addrinfo));
ahints.ai_family = res0->ai_family;
ahints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
@ -490,16 +504,8 @@ remote_connect(char *host, char *port, struct addrinfo hints)
errx(1, "bind failed: %s", strerror(errno));
freeaddrinfo(ares);
}
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);
}
set_common_sockopts(s);
if (connect(s, res0->ai_addr, res0->ai_addrlen) == 0)
break;
@ -544,23 +550,14 @@ local_listen(char *host, char *port, struct addrinfo hints)
res0 = res;
do {
if ((s = socket(res0->ai_family, res0->ai_socktype,
res0->ai_protocol)) == 0)
res0->ai_protocol)) < 0)
continue;
ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
if (ret == -1)
err(1, NULL);
if (Sflag) {
ret = setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
&x, sizeof(x));
if (ret == -1)
err(1, NULL);
}
if (Dflag) {
if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
&x, sizeof(x)) == -1)
err(1, NULL);
}
set_common_sockopts(s);
if (bind(s, (struct sockaddr *)res0->ai_addr,
res0->ai_addrlen) == 0)
@ -588,9 +585,12 @@ void
readwrite(int nfd)
{
struct pollfd pfd[2];
unsigned char buf[BUFSIZ];
int wfd = fileno(stdin), n;
unsigned char buf[8192];
int n, wfd = fileno(stdin);
int lfd = fileno(stdout);
int plen;
plen = jflag ? 8192 : 1024;
/* Setup Network FD */
pfd[0].fd = nfd;
@ -613,7 +613,7 @@ readwrite(int nfd)
return;
if (pfd[0].revents & POLLIN) {
if ((n = read(nfd, buf, sizeof(buf))) < 0)
if ((n = read(nfd, buf, plen)) < 0)
return;
else if (n == 0) {
shutdown(nfd, SHUT_RD);
@ -622,22 +622,20 @@ readwrite(int nfd)
} else {
if (tflag)
atelnet(nfd, buf, n);
if (atomicio((ssize_t (*)(int, void *, size_t))write,
lfd, buf, n) != n)
if (atomicio(vwrite, lfd, buf, n) != n)
return;
}
}
if (!dflag && pfd[1].revents & POLLIN) {
if ((n = read(wfd, buf, sizeof(buf))) < 0)
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((ssize_t (*)(int, void *, size_t))write,
nfd, buf, n) != n)
if (atomicio(vwrite, nfd, buf, n) != n)
return;
}
}
@ -668,9 +666,8 @@ atelnet(int nfd, unsigned char *buf, unsigned int size)
p++;
obuf[2] = *p;
obuf[3] = '\0';
if (atomicio((ssize_t (*)(int, void *, size_t))write,
nfd, obuf, 3) != 3)
warnx("Write Error!");
if (atomicio(vwrite, nfd, obuf, 3) != 3)
warn("Write Error!");
obuf[0] = '\0';
}
}
@ -761,6 +758,50 @@ udptest(int s)
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");
}
}
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)
{
@ -775,10 +816,12 @@ help(void)
\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-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\
@ -795,7 +838,7 @@ void
usage(int ret)
{
fprintf(stderr, "usage: nc [-46DdhklnrStUuvz] [-i interval] [-p source_port]\n");
fprintf(stderr, "\t [-s source_ip_address] [-w timeout] [-X proxy_version]\n");
fprintf(stderr, "\t [-s source_ip_address] [-T ToS] [-w timeout] [-X proxy_version]\n");
fprintf(stderr, "\t [-x proxy_address[:port]] [hostname] [port[s]]\n");
if (ret)
exit(1);

298
contrib/netcat/socks.c
View File

@ -1,7 +1,8 @@
/* $OpenBSD: socks.c,v 1.9 2004/10/17 03:13:55 djm Exp $ */
/* $OpenBSD: socks.c,v 1.16 2006/01/25 23:21:37 djm 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
@ -36,6 +37,9 @@
#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"
@ -46,57 +50,53 @@
#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 *);
int remote_connect(char *, char *, struct addrinfo);
int socks_connect(char *host, char *port, struct addrinfo hints,
char *proxyhost, char *proxyport, struct addrinfo proxyhints,
int socksv);
static in_addr_t
decode_addr(const char *s)
static int
decode_addrport(const char *h, const char *p, struct sockaddr *addr,
socklen_t addrlen, int v4only, int numeric)
{
struct hostent *hp = gethostbyname (s);
struct in_addr retval;
int r;
struct addrinfo hints, *res;
if (hp)
return *(in_addr_t *)hp->h_addr_list[0];
if (inet_aton (s, &retval))
return retval.s_addr;
errx (1, "cannot decode address \"%s\"", s);
}
static in_port_t
decode_port(const char *s)
{
struct servent *sp;
in_port_t port;
char *p;
port = strtol (s, &p, 10);
if (s == p) {
sp = getservbyname (s, "tcp");
if (sp)
return sp->s_port;
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 (*s != '\0' && *p == '\0')
return htons (port);
errx (1, "cannot decode port \"%s\"", s);
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, int bufsz)
proxy_read_line(int fd, char *buf, size_t bufsz)
{
int r, off;
size_t off;
for(off = 0;;) {
if (off >= bufsz)
errx(1, "proxy read too long");
if ((r = read(fd, buf + off, 1)) <= 0) {
if (r == -1 && errno == EINTR)
continue;
if (atomicio(read, fd, buf + off, 1) != 1)
err(1, "proxy read");
}
/* Skip CR */
if (buf[off] == '\r')
continue;
@ -109,127 +109,217 @@ proxy_read_line(int fd, char *buf, int bufsz)
return (off);
}
int
socks_connect(char *host, char *port, struct addrinfo hints,
char *proxyhost, char *proxyport, struct addrinfo proxyhints,
int socksv)
static const char *
getproxypass(const char *proxyuser, const char *proxyhost)
{
int proxyfd, r;
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];
ssize_t cnt;
in_addr_t serveraddr;
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;
serveraddr = decode_addr (host);
serverport = decode_port (port);
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 = write (proxyfd, buf, 3);
if (cnt == -1)
err (1, "write failed");
cnt = atomicio(vwrite, proxyfd, buf, 3);
if (cnt != 3)
errx (1, "short write, %d (expected 3)", cnt);
err(1, "write failed (%d/3)", cnt);
cnt = atomicio(read, proxyfd, buf, 2);
if (cnt != 2)
err(1, "read failed (%d/3)", cnt);
read (proxyfd, buf, 2);
if (buf[1] == SOCKS_NOMETHOD)
errx (1, "authentication method negotiation failed");
errx(1, "authentication method negotiation failed");
/* Version 5, connect: IPv4 address */
buf[0] = SOCKS_V5;
buf[1] = SOCKS_CONNECT;
buf[2] = 0;
buf[3] = SOCKS_IPV4;
memcpy (buf + 4, &serveraddr, sizeof serveraddr);
memcpy (buf + 8, &serverport, sizeof serverport);
switch (addr.ss_family) {
case 0:
/* Version 5, connect: domain name */
/* XXX Handle short writes better */
cnt = write (proxyfd, buf, 10);
if (cnt == -1)
err (1, "write failed");
/* 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 (%d/%d)", cnt, wlen);
cnt = atomicio(read, proxyfd, buf, 10);
if (cnt != 10)
errx (1, "short write, %d (expected 10)", cnt);
/* XXX Handle short reads better */
cnt = read (proxyfd, buf, sizeof buf);
if (cnt == -1)
err (1, "read failed");
if (cnt != 10)
errx (1, "unexpected reply size %d (expected 10)", cnt);
err(1, "read failed (%d/10)", cnt);
if (buf[1] != 0)
errx (1, "connection failed, SOCKS error %d", buf[1]);
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, &serverport, sizeof serverport);
memcpy (buf + 4, &serveraddr, sizeof serveraddr);
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 = write (proxyfd, buf, 9);
if (cnt == -1)
err (1, "write failed");
if (cnt != 9)
errx (1, "short write, %d (expected 9)", cnt);
cnt = atomicio(vwrite, proxyfd, buf, wlen);
if (cnt != wlen)
err(1, "write failed (%d/%d)", cnt, wlen);
/* XXX Handle short reads better */
cnt = read (proxyfd, buf, 8);
if (cnt == -1)
err (1, "read failed");
cnt = atomicio(read, proxyfd, buf, 8);
if (cnt != 8)
errx (1, "unexpected reply size %d (expected 8)", cnt);
err(1, "read failed (%d/8)", cnt);
if (buf[1] != 90)
errx (1, "connection failed, SOCKS error %d", buf[1]);
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");
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\r\n",
"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\r\n",
"CONNECT %s:%d HTTP/1.0\r\n",
host, ntohs(serverport));
}
if (r == -1 || r >= sizeof(buf))
errx (1, "hostname too long");
if (r == -1 || (size_t)r >= sizeof(buf))
errx(1, "hostname too long");
r = strlen(buf);
/* XXX atomicio */
cnt = write (proxyfd, buf, r);
if (cnt == -1)
err (1, "write failed");
cnt = atomicio(vwrite, proxyfd, buf, r);
if (cnt != r)
errx (1, "short write, %d (expected %d)", cnt, r);
err(1, "write failed (%d/%d)", cnt, r);
/* Read reply */
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 (%d/%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)
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 (r == 0 && strncmp(buf, "HTTP/1.0 200 ", 12) != 0)
errx (1, "Proxy error: \"%s\"", buf);
/* Discard headers until we hit an empty line */
if (*buf == '\0')
break;
}
if (*buf != '\0')
errx(1, "Too many proxy headers received");
} else
errx (1, "Unknown proxy protocol %d", socksv);
errx(1, "Unknown proxy protocol %d", socksv);
return proxyfd;
return (proxyfd);
}