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/* $OpenBSD: netcat.c,v 1.126 2014/10/30 16:08:31 tedu 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 "includes.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netinet/ip.h>
#include <errno.h>
#include <netdb.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"
#ifdef HAVE_POLL_H
#include <poll.h>
#else
# ifdef HAVE_SYS_POLL_H
# include <sys/poll.h>
# endif
#endif
/* Telnet options from arpa/telnet.h */
#define IAC 255
#define DONT 254
#define DO 253
#define WONT 252
#define WILL 251
#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
#define UNIX_DG_TMP_SOCKET_SIZE 19
#define POLL_STDIN 0
#define POLL_NETOUT 1
#define POLL_NETIN 2
#define POLL_STDOUT 3
#define BUFSIZE 16384
/* Command Line Options */
int dflag; /* detached, no stdin */
int Fflag; /* fdpass sock to stdout */
unsigned int iflag; /* Interval Flag */
int kflag; /* More than one connect */
int lflag; /* Bind to local port */
int Nflag; /* shutdown() network socket */
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 */
int rtableid = -1;
int timeout = -1;
int family = AF_UNSPEC;
char *portlist[PORT_MAX+1];
char *unix_dg_tmp_socket;
void atelnet(int, unsigned char *, unsigned int);
void build_ports(char *);
void help(void);
int local_listen(char *, char *, struct addrinfo);
void readwrite(int);
void fdpass(int nfd) __attribute__((noreturn));
int remote_connect(const char *, const char *, struct addrinfo);
int timeout_connect(int, const struct sockaddr *, socklen_t);
int socks_connect(const char *, const char *, struct addrinfo,
const char *, const char *, struct addrinfo, int, const char *);
int udptest(int);
int unix_bind(char *);
int unix_connect(char *);
int unix_listen(char *);
void set_common_sockopts(int);
int map_tos(char *, int *);
void report_connect(const struct sockaddr *, socklen_t);
void usage(int);
ssize_t drainbuf(int, unsigned char *, size_t *);
ssize_t fillbuf(int, unsigned char *, size_t *);
static void err(int, const char *, ...) __attribute__((format(printf, 2, 3)));
static void errx(int, const char *, ...) __attribute__((format(printf, 2, 3)));
static void warn(const char *, ...) __attribute__((format(printf, 1, 2)));
static void
err(int r, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
fprintf(stderr, "%s: ", strerror(errno));
vfprintf(stderr, fmt, args);
fputc('\n', stderr);
va_end(args);
exit(r);
}
static void
errx(int r, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
fputc('\n', stderr);
va_end(args);
exit(r);
}
static void
warn(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
fprintf(stderr, "%s: ", strerror(errno));
vfprintf(stderr, fmt, args);
fputc('\n', stderr);
va_end(args);
}
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 = NULL;
const char *errstr, *proxyhost = "", *proxyport = NULL;
struct addrinfo proxyhints;
char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE];
ret = 1;
s = 0;
socksv = 5;
host = NULL;
uport = NULL;
sv = NULL;
while ((ch = getopt(argc, argv,
"46DdFhI:i:klNnO: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 'F':
Fflag = 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 'k':
kflag = 1;
break;
case 'l':
lflag = 1;
break;
case 'N':
Nflag = 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;
#ifdef SO_RTABLE
case 'V':
rtableid = (int)strtonum(optarg, 0,
RT_TABLEID_MAX, &errstr);
if (errstr)
errx(1, "rtable %s: %s", errstr, optarg);
break;
#endif
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)
errx(1, "strdup");
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':
errstr = NULL;
errno = 0;
if (map_tos(optarg, &Tflag))
break;
if (strlen(optarg) > 1 && optarg[0] == '0' &&
optarg[1] == 'x')
Tflag = (int)strtol(optarg, NULL, 16);
else
Tflag = (int)strtonum(optarg, 0, 255,
&errstr);
if (Tflag < 0 || Tflag > 255 || errstr || errno)
errx(1, "illegal tos value %s", 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) {
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");
/* Get name of temporary socket for unix datagram client */
if ((family == AF_UNIX) && uflag && !lflag) {
if (sflag) {
unix_dg_tmp_socket = sflag;
} else {
strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
UNIX_DG_TMP_SOCKET_SIZE);
if (mktemp(unix_dg_tmp_socket_buf) == NULL)
err(1, "mktemp");
unix_dg_tmp_socket = unix_dg_tmp_socket_buf;
}
}
/* 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) {
if (uflag)
s = unix_bind(host);
else
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, "local_listen");
/*
* For UDP and -k, don't connect the socket, let it
* receive datagrams from multiple socket pairs.
*/
if (uflag && kflag)
readwrite(s);
/*
* For UDP and not -k, we will use recvfrom() initially
* to wait for a caller, then use the regular functions
* to talk to the caller.
*/
else if (uflag && !kflag) {
int rv, plen;
char buf[16384];
struct sockaddr_storage z;
len = sizeof(z);
plen = 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");
if (vflag)
report_connect((struct sockaddr *)&z, len);
readwrite(s);
} else {
len = sizeof(cliaddr);
connfd = accept(s, (struct sockaddr *)&cliaddr,
&len);
if (connfd == -1) {
/* For now, all errnos are fatal */
err(1, "accept");
}
if (vflag)
report_connect((struct sockaddr *)&cliaddr, len);
readwrite(connfd);
close(connfd);
}
if (family != AF_UNIX)
close(s);
else if (uflag) {
if (connect(s, NULL, 0) < 0)
err(1, "connect");
}
if (!kflag)
break;
}
} else if (family == AF_UNIX) {
ret = 0;
if ((s = unix_connect(host)) > 0 && !zflag) {
readwrite(s);
close(s);
} else
ret = 1;
if (uflag)
unlink(unix_dg_tmp_socket);
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 (Fflag)
fdpass(s);
else if (!zflag)
readwrite(s);
}
}
if (s)
close(s);
exit(ret);
}
/*
* unix_bind()
* Returns a unix socket bound to the given path
*/
int
unix_bind(char *path)
{
struct sockaddr_un sun_sa;
int s;
/* Create unix domain socket. */
if ((s = socket(AF_UNIX, uflag ? SOCK_DGRAM : SOCK_STREAM,
0)) < 0)
return (-1);
memset(&sun_sa, 0, sizeof(struct sockaddr_un));
sun_sa.sun_family = AF_UNIX;
if (strlcpy(sun_sa.sun_path, path, sizeof(sun_sa.sun_path)) >=
sizeof(sun_sa.sun_path)) {
close(s);
errno = ENAMETOOLONG;
return (-1);
}
if (bind(s, (struct sockaddr *)&sun_sa, SUN_LEN(&sun_sa)) < 0) {
close(s);
return (-1);
}
return (s);
}
/*
* unix_connect()
* Returns a socket connected to a local unix socket. Returns -1 on failure.
*/
int
unix_connect(char *path)
{
struct sockaddr_un sun_sa;
int s;
if (uflag) {
if ((s = unix_bind(unix_dg_tmp_socket)) < 0)
return (-1);
} else {
if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
return (-1);
}
(void)fcntl(s, F_SETFD, FD_CLOEXEC);
memset(&sun_sa, 0, sizeof(struct sockaddr_un));
sun_sa.sun_family = AF_UNIX;
if (strlcpy(sun_sa.sun_path, path, sizeof(sun_sa.sun_path)) >=
sizeof(sun_sa.sun_path)) {
close(s);
errno = ENAMETOOLONG;
return (-1);
}
if (connect(s, (struct sockaddr *)&sun_sa, SUN_LEN(&sun_sa)) < 0) {
close(s);
return (-1);
}
return (s);
}
/*
* unix_listen()
* Create a unix domain socket, and listen on it.
*/
int
unix_listen(char *path)
{
int s;
if ((s = unix_bind(path)) < 0)
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;
#if defined(SO_RTABLE) || defined(SO_BINDANY)
int on = 1;
#endif
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;
#ifdef SO_RTABLE
if (rtableid >= 0 && (setsockopt(s, SOL_SOCKET, SO_RTABLE,
&rtableid, sizeof(rtableid)) == -1))
err(1, "setsockopt SO_RTABLE");
#endif
/* Bind to a local port or source address if specified. */
if (sflag || pflag) {
struct addrinfo ahints, *ares;
#ifdef SO_BINDANY
/* try SO_BINDANY, but don't insist */
setsockopt(s, SOL_SOCKET, SO_BINDANY, &on, sizeof(on));
#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;
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)
err(1, "bind failed");
freeaddrinfo(ares);
}
set_common_sockopts(s);
if (timeout_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);
}
int
timeout_connect(int s, const struct sockaddr *name, socklen_t namelen)
{
struct pollfd pfd;
socklen_t optlen;
int flags = 0, optval;
int ret;
if (timeout != -1) {
flags = fcntl(s, F_GETFL, 0);
if (fcntl(s, F_SETFL, flags | O_NONBLOCK) == -1)
err(1, "set non-blocking mode");
}
if ((ret = connect(s, name, namelen)) != 0 && errno == EINPROGRESS) {
pfd.fd = s;
pfd.events = POLLOUT;
if ((ret = poll(&pfd, 1, timeout)) == 1) {
optlen = sizeof(optval);
if ((ret = getsockopt(s, SOL_SOCKET, SO_ERROR,
&optval, &optlen)) == 0) {
errno = optval;
ret = optval == 0 ? 0 : -1;
}
} else if (ret == 0) {
errno = ETIMEDOUT;
ret = -1;
} else
err(1, "poll failed");
}
if (timeout != -1 && fcntl(s, F_SETFL, flags) == -1)
err(1, "restoring flags");
return (ret);
}
/*
* 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;
#ifdef SO_RTABLE
if (rtableid >= 0 && (setsockopt(s, SOL_SOCKET, SO_RTABLE,
&rtableid, sizeof(rtableid)) == -1))
err(1, "setsockopt SO_RTABLE");
#endif
#ifdef SO_REUSEPORT
ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
if (ret == -1)
err(1, "setsockopt");
#endif
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 net_fd)
{
struct pollfd pfd[4];
int stdin_fd = STDIN_FILENO;
int stdout_fd = STDOUT_FILENO;
unsigned char netinbuf[BUFSIZE];
size_t netinbufpos = 0;
unsigned char stdinbuf[BUFSIZE];
size_t stdinbufpos = 0;
int n, num_fds;
ssize_t ret;
/* don't read from stdin if requested */
if (dflag)
stdin_fd = -1;
/* stdin */
pfd[POLL_STDIN].fd = stdin_fd;
pfd[POLL_STDIN].events = POLLIN;
/* network out */
pfd[POLL_NETOUT].fd = net_fd;
pfd[POLL_NETOUT].events = 0;
/* network in */
pfd[POLL_NETIN].fd = net_fd;
pfd[POLL_NETIN].events = POLLIN;
/* stdout */
pfd[POLL_STDOUT].fd = stdout_fd;
pfd[POLL_STDOUT].events = 0;
while (1) {
/* both inputs are gone, buffers are empty, we are done */
if (pfd[POLL_STDIN].fd == -1 && pfd[POLL_NETIN].fd == -1
&& stdinbufpos == 0 && netinbufpos == 0) {
close(net_fd);
return;
}
/* both outputs are gone, we can't continue */
if (pfd[POLL_NETOUT].fd == -1 && pfd[POLL_STDOUT].fd == -1) {
close(net_fd);
return;
}
/* listen and net in gone, queues empty, done */
if (lflag && pfd[POLL_NETIN].fd == -1
&& stdinbufpos == 0 && netinbufpos == 0) {
close(net_fd);
return;
}
/* help says -i is for "wait between lines sent". We read and
* write arbitrary amounts of data, and we don't want to start
* scanning for newlines, so this is as good as it gets */
if (iflag)
sleep(iflag);
/* poll */
num_fds = poll(pfd, 4, timeout);
/* treat poll errors */
if (num_fds == -1) {
close(net_fd);
err(1, "polling error");
}
/* timeout happened */
if (num_fds == 0)
return;
/* treat socket error conditions */
for (n = 0; n < 4; n++) {
if (pfd[n].revents & (POLLERR|POLLNVAL)) {
pfd[n].fd = -1;
}
}
/* reading is possible after HUP */
if (pfd[POLL_STDIN].events & POLLIN &&
pfd[POLL_STDIN].revents & POLLHUP &&
! (pfd[POLL_STDIN].revents & POLLIN))
pfd[POLL_STDIN].fd = -1;
if (pfd[POLL_NETIN].events & POLLIN &&
pfd[POLL_NETIN].revents & POLLHUP &&
! (pfd[POLL_NETIN].revents & POLLIN))
pfd[POLL_NETIN].fd = -1;
if (pfd[POLL_NETOUT].revents & POLLHUP) {
if (Nflag)
shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
pfd[POLL_NETOUT].fd = -1;
}
/* if HUP, stop watching stdout */
if (pfd[POLL_STDOUT].revents & POLLHUP)
pfd[POLL_STDOUT].fd = -1;
/* if no net out, stop watching stdin */
if (pfd[POLL_NETOUT].fd == -1)
pfd[POLL_STDIN].fd = -1;
/* if no stdout, stop watching net in */
if (pfd[POLL_STDOUT].fd == -1) {
if (pfd[POLL_NETIN].fd != -1)
shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
pfd[POLL_NETIN].fd = -1;
}
/* try to read from stdin */
if (pfd[POLL_STDIN].revents & POLLIN && stdinbufpos < BUFSIZE) {
ret = fillbuf(pfd[POLL_STDIN].fd, stdinbuf,
&stdinbufpos);
/* error or eof on stdin - remove from pfd */
if (ret == 0 || ret == -1)
pfd[POLL_STDIN].fd = -1;
/* read something - poll net out */
if (stdinbufpos > 0)
pfd[POLL_NETOUT].events = POLLOUT;
/* filled buffer - remove self from polling */
if (stdinbufpos == BUFSIZE)
pfd[POLL_STDIN].events = 0;
}
/* try to write to network */
if (pfd[POLL_NETOUT].revents & POLLOUT && stdinbufpos > 0) {
ret = drainbuf(pfd[POLL_NETOUT].fd, stdinbuf,
&stdinbufpos);
if (ret == -1)
pfd[POLL_NETOUT].fd = -1;
/* buffer empty - remove self from polling */
if (stdinbufpos == 0)
pfd[POLL_NETOUT].events = 0;
/* buffer no longer full - poll stdin again */
if (stdinbufpos < BUFSIZE)
pfd[POLL_STDIN].events = POLLIN;
}
/* try to read from network */
if (pfd[POLL_NETIN].revents & POLLIN && netinbufpos < BUFSIZE) {
ret = fillbuf(pfd[POLL_NETIN].fd, netinbuf,
&netinbufpos);
if (ret == -1)
pfd[POLL_NETIN].fd = -1;
/* eof on net in - remove from pfd */
if (ret == 0) {
shutdown(pfd[POLL_NETIN].fd, SHUT_RD);
pfd[POLL_NETIN].fd = -1;
}
/* read something - poll stdout */
if (netinbufpos > 0)
pfd[POLL_STDOUT].events = POLLOUT;
/* filled buffer - remove self from polling */
if (netinbufpos == BUFSIZE)
pfd[POLL_NETIN].events = 0;
/* handle telnet */
if (tflag)
atelnet(pfd[POLL_NETIN].fd, netinbuf,
netinbufpos);
}
/* try to write to stdout */
if (pfd[POLL_STDOUT].revents & POLLOUT && netinbufpos > 0) {
ret = drainbuf(pfd[POLL_STDOUT].fd, netinbuf,
&netinbufpos);
if (ret == -1)
pfd[POLL_STDOUT].fd = -1;
/* buffer empty - remove self from polling */
if (netinbufpos == 0)
pfd[POLL_STDOUT].events = 0;
/* buffer no longer full - poll net in again */
if (netinbufpos < BUFSIZE)
pfd[POLL_NETIN].events = POLLIN;
}
/* stdin gone and queue empty? */
if (pfd[POLL_STDIN].fd == -1 && stdinbufpos == 0) {
if (pfd[POLL_NETOUT].fd != -1 && Nflag)
shutdown(pfd[POLL_NETOUT].fd, SHUT_WR);
pfd[POLL_NETOUT].fd = -1;
}
/* net in gone and queue empty? */
if (pfd[POLL_NETIN].fd == -1 && netinbufpos == 0) {
pfd[POLL_STDOUT].fd = -1;
}
}
}
ssize_t
drainbuf(int fd, unsigned char *buf, size_t *bufpos)
{
ssize_t n;
ssize_t adjust;
n = write(fd, buf, *bufpos);
/* don't treat EAGAIN, EINTR as error */
if (n == -1 && (errno == EAGAIN || errno == EINTR))
n = -2;
if (n <= 0)
return n;
/* adjust buffer */
adjust = *bufpos - n;
if (adjust > 0)
memmove(buf, buf + n, adjust);
*bufpos -= n;
return n;
}
ssize_t
fillbuf(int fd, unsigned char *buf, size_t *bufpos)
{
size_t num = BUFSIZE - *bufpos;
ssize_t n;
n = read(fd, buf + *bufpos, num);
/* don't treat EAGAIN, EINTR as error */
if (n == -1 && (errno == EAGAIN || errno == EINTR))
n = -2;
if (n <= 0)
return n;
*bufpos += n;
return n;
}
/*
* fdpass()
* Pass the connected file descriptor to stdout and exit.
*/
void
fdpass(int nfd)
{
#if defined(HAVE_SENDMSG) && (defined(HAVE_ACCRIGHTS_IN_MSGHDR) || defined(HAVE_CONTROL_IN_MSGHDR))
struct msghdr msg;
#ifndef HAVE_ACCRIGHTS_IN_MSGHDR
union {
struct cmsghdr hdr;
char buf[CMSG_SPACE(sizeof(int))];
} cmsgbuf;
struct cmsghdr *cmsg;
#endif
struct iovec vec;
char ch = '\0';
struct pollfd pfd;
ssize_t r;
memset(&msg, 0, sizeof(msg));
#ifdef HAVE_ACCRIGHTS_IN_MSGHDR
msg.msg_accrights = (caddr_t)&nfd;
msg.msg_accrightslen = sizeof(nfd);
#else
memset(&cmsgbuf, 0, sizeof(cmsgbuf));
msg.msg_control = (caddr_t)&cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
*(int *)CMSG_DATA(cmsg) = nfd;
#endif
vec.iov_base = &ch;
vec.iov_len = 1;
msg.msg_iov = &vec;
msg.msg_iovlen = 1;
bzero(&pfd, sizeof(pfd));
pfd.fd = STDOUT_FILENO;
for (;;) {
r = sendmsg(STDOUT_FILENO, &msg, 0);
if (r == -1) {
if (errno == EAGAIN || errno == EINTR) {
pfd.events = POLLOUT;
if (poll(&pfd, 1, -1) == -1)
err(1, "poll");
continue;
}
err(1, "sendmsg");
} else if (r == -1)
errx(1, "sendmsg: unexpected return value %zd", r);
else
break;
}
exit(0);
#else
errx(1, "%s: file descriptor passing not supported", __func__);
#endif
}
/* 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 of 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) {
*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)
errx(1, "calloc");
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)
errx(1, "strdup");
}
}
/*
* udptest()
* Do a few writes to see if the UDP port is there.
* Fails once PF state table is full.
*/
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;
#ifdef TCP_MD5SIG
if (Sflag) {
if (setsockopt(s, IPPROTO_TCP, TCP_MD5SIG,
&x, sizeof(x)) == -1)
err(1, "setsockopt");
}
#endif
if (Dflag) {
if (setsockopt(s, SOL_SOCKET, SO_DEBUG,
&x, sizeof(x)) == -1)
err(1, "setsockopt");
}
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
map_tos(char *s, int *val)
{
/* DiffServ Codepoints and other TOS mappings */
const struct toskeywords {
const char *keyword;
int val;
} *t, toskeywords[] = {
{ "af11", IPTOS_DSCP_AF11 },
{ "af12", IPTOS_DSCP_AF12 },
{ "af13", IPTOS_DSCP_AF13 },
{ "af21", IPTOS_DSCP_AF21 },
{ "af22", IPTOS_DSCP_AF22 },
{ "af23", IPTOS_DSCP_AF23 },
{ "af31", IPTOS_DSCP_AF31 },
{ "af32", IPTOS_DSCP_AF32 },
{ "af33", IPTOS_DSCP_AF33 },
{ "af41", IPTOS_DSCP_AF41 },
{ "af42", IPTOS_DSCP_AF42 },
{ "af43", IPTOS_DSCP_AF43 },
{ "critical", IPTOS_PREC_CRITIC_ECP },
{ "cs0", IPTOS_DSCP_CS0 },
{ "cs1", IPTOS_DSCP_CS1 },
{ "cs2", IPTOS_DSCP_CS2 },
{ "cs3", IPTOS_DSCP_CS3 },
{ "cs4", IPTOS_DSCP_CS4 },
{ "cs5", IPTOS_DSCP_CS5 },
{ "cs6", IPTOS_DSCP_CS6 },
{ "cs7", IPTOS_DSCP_CS7 },
{ "ef", IPTOS_DSCP_EF },
{ "inetcontrol", IPTOS_PREC_INTERNETCONTROL },
{ "lowdelay", IPTOS_LOWDELAY },
{ "netcontrol", IPTOS_PREC_NETCONTROL },
{ "reliability", IPTOS_RELIABILITY },
{ "throughput", IPTOS_THROUGHPUT },
{ NULL, -1 },
};
for (t = toskeywords; t->keyword != NULL; t++) {
if (strcmp(s, t->keyword) == 0) {
*val = t->val;
return (1);
}
}
return (0);
}
void
report_connect(const struct sockaddr *sa, socklen_t salen)
{
char remote_host[NI_MAXHOST];
char remote_port[NI_MAXSERV];
int herr;
int flags = NI_NUMERICSERV;
if (nflag)
flags |= NI_NUMERICHOST;
if ((herr = getnameinfo(sa, salen,
remote_host, sizeof(remote_host),
remote_port, sizeof(remote_port),
flags)) != 0) {
if (herr == EAI_SYSTEM)
err(1, "getnameinfo");
else
errx(1, "getnameinfo: %s", gai_strerror(herr));
}
fprintf(stderr,
"Connection from %s %s "
"received!\n", remote_host, remote_port);
}
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-F Pass socket fd\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 Shutdown the network socket after EOF on stdin\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 toskeyword\tSet 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 [-46DdFhklNnrStUuvz] [-I length] [-i interval] [-O length]\n"
"\t [-P proxy_username] [-p source_port] [-s source] [-T ToS]\n"
"\t [-V rtable] [-w timeout] [-X proxy_protocol]\n"
"\t [-x proxy_address[:port]] [destination] [port]\n");
if (ret)
exit(1);
}
/* *** src/usr.bin/nc/socks.c *** */
/* $OpenBSD: socks.c,v 1.20 2012/03/08 09:56:28 espie 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 <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <resolv.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 = 0;
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, 4);
if (cnt != 4)
err(1, "read failed (%zu/4)", cnt);
if (buf[1] != 0)
errx(1, "connection failed, SOCKS error %d", buf[1]);
switch (buf[3]) {
case SOCKS_IPV4:
cnt = atomicio(read, proxyfd, buf + 4, 6);
if (cnt != 6)
err(1, "read failed (%zu/6)", cnt);
break;
case SOCKS_IPV6:
cnt = atomicio(read, proxyfd, buf + 4, 18);
if (cnt != 18)
err(1, "read failed (%zu/18)", cnt);
break;
default:
errx(1, "connection failed, unsupported address type");
}
} 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 != (size_t)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)) != (size_t)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);
}
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