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netcat.c
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/* $OpenBSD: netcat.c,v 1.130 2015/07/26 19:12:28 chl Exp $ */
/*
* Copyright (c) 2001 Eric Jackson <[email protected]>
*
* 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* <[email protected]>.
*/
#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 <arpa/telnet.h>
#include <arpa/inet.h>
#ifndef IPTOS_LOWDELAY
# define IPTOS_LOWDELAY 0x10
# define IPTOS_THROUGHPUT 0x08
# define IPTOS_RELIABILITY 0x04
# define IPTOS_LOWCOST 0x02
# define IPTOS_MINCOST IPTOS_LOWCOST
#endif /* IPTOS_LOWDELAY */
# ifndef IPTOS_DSCP_AF11
# define IPTOS_DSCP_AF11 0x28
# define IPTOS_DSCP_AF12 0x30
# define IPTOS_DSCP_AF13 0x38
# define IPTOS_DSCP_AF21 0x48
# define IPTOS_DSCP_AF22 0x50
# define IPTOS_DSCP_AF23 0x58
# define IPTOS_DSCP_AF31 0x68
# define IPTOS_DSCP_AF32 0x70
# define IPTOS_DSCP_AF33 0x78
# define IPTOS_DSCP_AF41 0x88
# define IPTOS_DSCP_AF42 0x90
# define IPTOS_DSCP_AF43 0x98
# define IPTOS_DSCP_EF 0xb8
#endif /* IPTOS_DSCP_AF11 */
#ifndef IPTOS_DSCP_CS0
# define IPTOS_DSCP_CS0 0x00
# define IPTOS_DSCP_CS1 0x20
# define IPTOS_DSCP_CS2 0x40
# define IPTOS_DSCP_CS3 0x60
# define IPTOS_DSCP_CS4 0x80
# define IPTOS_DSCP_CS5 0xa0
# define IPTOS_DSCP_CS6 0xc0
# define IPTOS_DSCP_CS7 0xe0
#endif /* IPTOS_DSCP_CS0 */
#ifndef IPTOS_DSCP_EF
# define IPTOS_DSCP_EF 0xb8
#endif /* IPTOS_DSCP_EF */
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <netdb.h>
#include <poll.h>
#include <signal.h>
#include <stddef.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <bsd/stdlib.h>
#include <bsd/string.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
#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
#define CONNECTION_SUCCESS 0
#define CONNECTION_FAILED 1
#define CONNECTION_TIMEOUT 2
#define UDP_SCAN_TIMEOUT 3 /* Seconds */
/* Command Line Options */
int bflag; /* Allow Broadcast */
int Cflag = 0; /* CRLF line-ending */
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 qflag = -1; /* Quit after some secs */
int rflag; /* Random ports flag */
char *sflag; /* Source Address */
int tflag; /* Telnet Emulation */
int uflag; /* UDP - Default to TCP */
int dccpflag; /* DCCP - Default to TCP */
int vflag; /* Verbosity */
int xflag; /* Socks proxy */
int zflag; /* Port Scan Flag */
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);
int map_tos(char *, int *);
void report_connect(const struct sockaddr *, socklen_t);
void usage(int);
ssize_t drainbuf(int, unsigned char *, size_t *, int);
ssize_t fillbuf(int, unsigned char *, size_t *);
char *proto_name(int uflag, int dccpflag);
static int connect_with_timeout(int fd, const struct sockaddr *sa,
socklen_t salen, int ctimeout);
static void quit();
int
main(int argc, char *argv[])
{
int ch, s, ret, socksv;
char *host, **uport;
struct addrinfo hints;
struct servent *sv;
socklen_t len;
union {
struct sockaddr_storage storage;
struct sockaddr_un forunix;
} 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;
signal(SIGPIPE, SIG_IGN);
while ((ch = getopt(argc, argv,
"46bCDdFhI:i:klNnO:P:p:q:rSs:tT:UuV:vw:X:x:Zz")) != -1) {
switch (ch) {
case '4':
family = AF_INET;
break;
case '6':
family = AF_INET6;
break;
case 'b':
# if defined(SO_BROADCAST)
bflag = 1;
# else
errx(1, "no broadcast frame support available");
# endif
break;
case 'U':
family = AF_UNIX;
break;
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 'q':
qflag = strtonum(optarg, INT_MIN, INT_MAX, &errstr);
if (errstr)
errx(1, "quit timer %s: %s", errstr, optarg);
if (qflag >= 0)
Nflag = 1;
break;
case 'r':
rflag = 1;
break;
case 's':
sflag = optarg;
break;
case 't':
tflag = 1;
break;
case 'u':
uflag = 1;
break;
case 'Z':
# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
dccpflag = 1;
# else
errx(1, "no DCCP support available");
# endif
break;
case 'V':
# if defined(RT_TABLEID_MAX)
rtableid = (int)strtonum(optarg, 0,
RT_TABLEID_MAX, &errstr);
if (errstr)
errx(1, "rtable %s: %s", errstr, optarg);
# else
errx(1, "no alternate routing table support available");
# endif
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':
# if defined(TCP_MD5SIG)
Sflag = 1;
# else
errx(1, "no TCP MD5 signature support available");
# endif
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;
case 'C':
Cflag = 1;
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 defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
if (dccpflag)
errx(1, "cannot use -Z and -U");
# endif
host = argv[0];
uport = NULL;
} else if (argv[0] && !argv[1] && lflag) {
if (pflag) {
uport = &pflag;
host = argv[0];
} else {
uport = argv;
host = NULL;
}
} else if (!argv[0] && lflag && pflag) {
uport = &pflag;
host = NULL;
} else if (argv[0] && argv[1]) {
host = argv[0];
uport = &argv[1];
} else
usage(1);
if (lflag) {
if (sflag)
errx(1, "cannot use -s and -l");
if (zflag)
errx(1, "cannot use -z and -l");
if (pflag)
/* This still does not work well because of getopt mess
errx(1, "cannot use -p and -l"); */
uport = &pflag;
} else if (!lflag && kflag)
errx(1, "cannot use -k without -l");
/* Get name of temporary socket for unix datagram client */
if ((family == AF_UNIX) && uflag && !lflag) {
if (sflag) {
unix_dg_tmp_socket = sflag;
} else {
strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
UNIX_DG_TMP_SOCKET_SIZE);
if (mkstemp(unix_dg_tmp_socket_buf) == -1)
err(1, "mkstemp");
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;
if (uflag) {
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = IPPROTO_UDP;
}
# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
else if (dccpflag) {
hints.ai_socktype = SOCK_DCCP;
hints.ai_protocol = IPPROTO_DCCP;
}
# endif
else {
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
}
if (nflag)
hints.ai_flags |= AI_NUMERICHOST;
}
if (xflag) {
if (uflag)
errx(1, "no proxy support for UDP mode");
# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
if (dccpflag)
errx(1, "no proxy support for DCCP mode");
# endif
if (lflag)
errx(1, "no proxy support for listen");
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);
} else
s = local_listen(host, *uport, hints);
if (s < 0)
err(1, NULL);
char* local;
if (family == AF_INET6)
local = ":::";
else
local = "0.0.0.0";
if (vflag && (family != AF_UNIX))
fprintf(stderr, "Listening on [%s] (family %d, port %s)\n",
host ?: local,
family,
*uport);
/* Allow only one connection at a time, but stay alive. */
for (;;) {
/*
* 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(cliaddr);
plen = 2048;
rv = recvfrom(s, buf, plen, MSG_PEEK,
(struct sockaddr *)&cliaddr, &len);
if (rv < 0)
err(1, "recvfrom");
rv = connect(s, (struct sockaddr *)&cliaddr, 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 (kflag)
continue;
if (family != AF_UNIX) {
close(s);
}
else if (uflag) {
if (connect(s, NULL, 0) < 0)
err(1, "connect");
}
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) {
/* For UDP, make sure we are connected. */
if (uflag) {
if (udptest(s) == -1) {
ret = 1;
continue;
}
}
char *proto = proto_name(uflag, dccpflag);
/* Don't look up port if -n. */
if (nflag)
sv = NULL;
else {
sv = getservbyport(
ntohs(atoi(portlist[i])),
proto);
}
fprintf(stderr,
"Connection to %s %s port [%s/%s] "
"succeeded!\n", host, portlist[i],
proto,
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;
int s;
/* Create unix domain socket. */
if ((s = socket(AF_UNIX, uflag ? SOCK_DGRAM : 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);
}
unlink(path);
if (bind(s, (struct sockaddr *)&sun, SUN_LEN(&sun)) < 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;
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) {
errx(1,"create unix socket failed");
return (-1);
}
}
(void)fcntl(s, F_SETFD, FD_CLOEXEC);
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;
warn("unix connect abandoned");
return (-1);
}
if (connect(s, (struct sockaddr *)&sun, SUN_LEN(&sun)) < 0) {
warn("unix connect failed");
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);
}
char *proto_name(int uflag, int dccpflag) {
char *proto = NULL;
if (uflag) {
proto = "udp";
}
# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
else if (dccpflag) {
proto = "dccp";
}
# endif
else {
proto = "tcp";
}
return proto;
}
/*
* remote_connect()
* Returns a socket connected to a remote host. Properly binds to a local
* 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 defined(RT_TABLEID_MAX)
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;
# if defined (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;
if (uflag) {
ahints.ai_socktype = SOCK_DGRAM;
ahints.ai_protocol = IPPROTO_UDP;
}
# if defined(IPPROTO_DCCP) && defined(SOCK_DCCP)
else if (dccpflag) {
hints.ai_socktype = SOCK_DCCP;
hints.ai_protocol = IPPROTO_DCCP;
}
# endif
else {
ahints.ai_socktype = SOCK_STREAM;
ahints.ai_protocol = IPPROTO_TCP;
}
ahints.ai_flags = AI_PASSIVE;
if ((error = getaddrinfo(sflag, pflag, &ahints, &ares)))
errx(1, "getaddrinfo: %s", gai_strerror(error));
if (bind(s, (struct sockaddr *)ares->ai_addr,
ares->ai_addrlen) < 0)
err(1, "bind failed");
freeaddrinfo(ares);
}
set_common_sockopts(s, res0->ai_family);
char *proto = proto_name(uflag, dccpflag);
if ((error = connect_with_timeout(s, res0->ai_addr, res0->ai_addrlen, timeout))== CONNECTION_SUCCESS) {
break;
}
else if (vflag && error == CONNECTION_FAILED) {
warn("connect to %s port %s (%s) failed", host, port,
proto);
}
else if (vflag && error == CONNECTION_TIMEOUT) {
warn("connect to %s port %s (%s) timed out", host, port,
proto);
}
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, 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);
}
static int connect_with_timeout(int fd, const struct sockaddr *sa,
socklen_t salen, int ctimeout)
{
int err;
struct timeval tv, *tvp = NULL;
fd_set connect_fdset;
socklen_t len;
int orig_flags;
orig_flags = fcntl(fd, F_GETFL, 0);
if (fcntl(fd, F_SETFL, orig_flags | O_NONBLOCK) < 0 ) {
warn("can't set O_NONBLOCK - timeout not available");
if (connect(fd, sa, salen) == 0)
return CONNECTION_SUCCESS;
else
return CONNECTION_FAILED;
}
/* set connect timeout */
if (ctimeout > 0) {
tv.tv_sec = (time_t)ctimeout/1000;
tv.tv_usec = 0;
tvp = &tv;
}
/* attempt the connection */
err = connect(fd, sa, salen);
if (err != 0 && errno == EINPROGRESS) {
/* connection is proceeding
* it is complete (or failed) when select returns */
/* initialize connect_fdset */
FD_ZERO(&connect_fdset);
FD_SET(fd, &connect_fdset);
/* call select */
do {
err = select(fd + 1, NULL, &connect_fdset,
NULL, tvp);
} while (err < 0 && errno == EINTR);
/* select error */
if (err < 0)
errx(1,"select error: %s", strerror(errno));
/* we have reached a timeout */
if (err == 0)
return CONNECTION_TIMEOUT;
/* select returned successfully, but we must test socket
* error for result */
len = sizeof(err);
if (getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &len) < 0)
errx(1, "getsockopt error: %s", strerror(errno));
/* setup errno according to the result returned by
* getsockopt */
if (err != 0)
errno = err;
}
/* return aborted if an error occured, and valid otherwise */
fcntl(fd, F_SETFL, orig_flags);
return (err != 0)? CONNECTION_FAILED : CONNECTION_SUCCESS;
}
/*
* local_listen()
* Returns a socket listening on a local port, binds to specified source
* 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 defined(RT_TABLEID_MAX)
if (rtableid >= 0 && (setsockopt(s, SOL_SOCKET, SO_RTABLE,
&rtableid, sizeof(rtableid)) == -1))
err(1, "setsockopt SO_RTABLE");
# endif
ret = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &x, sizeof(x));
if (ret == -1)
err(1, NULL);
# if defined(SO_REUSEPORT)
ret = setsockopt(s, SOL_SOCKET, SO_REUSEPORT, &x, sizeof(x));
if (ret == -1)
err(1, NULL);
# endif
set_common_sockopts(s, res0->ai_family);
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];