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head/contrib/netcat/netcat.c

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int Fflag; /* fdpass sock to stdout */ int Fflag; /* fdpass sock to stdout */
unsigned int iflag; /* Interval Flag */ unsigned int iflag; /* Interval Flag */
int kflag; /* More than one connect */ int kflag; /* More than one connect */
int lflag; /* Bind to local port */ int lflag; /* Bind to local port */
int FreeBSD_Mflag; /* Measure using stats(3) */ int FreeBSD_Mflag; /* Measure using stats(3) */
int Nflag; /* shutdown() network socket */ int Nflag; /* shutdown() network socket */
int nflag; /* Don't do name look up */ int nflag; /* Don't do name look up */
int FreeBSD_Oflag; /* Do not use TCP options */ int FreeBSD_Oflag; /* Do not use TCP options */
int FreeBSD_sctp; /* Use SCTP */
char *Pflag; /* Proxy username */ char *Pflag; /* Proxy username */
char *pflag; /* Localport flag */ char *pflag; /* Localport flag */
int rflag; /* Random ports flag */ int rflag; /* Random ports flag */
char *sflag; /* Source Address */ char *sflag; /* Source Address */
int tflag; /* Telnet Emulation */ int tflag; /* Telnet Emulation */
int uflag; /* UDP - Default to TCP */ int uflag; /* UDP - Default to TCP */
int vflag; /* Verbosity */ int vflag; /* Verbosity */
int xflag; /* Socks proxy */ int xflag; /* Socks proxy */
▲ Show 20 Lines • Show All 51 Lines • ▼ Show 20 Linesmain(int argc, char *argv[])
socklen_t len; socklen_t len;
struct sockaddr_storage cliaddr; struct sockaddr_storage cliaddr;
char *proxy; char *proxy;
const char *errstr, *proxyhost = "", *proxyport = NULL; const char *errstr, *proxyhost = "", *proxyport = NULL;
struct addrinfo proxyhints; struct addrinfo proxyhints;
char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE]; char unix_dg_tmp_socket_buf[UNIX_DG_TMP_SOCKET_SIZE];
struct option longopts[] = { struct option longopts[] = {
{ "no-tcpopt", no_argument, &FreeBSD_Oflag, 1 }, { "no-tcpopt", no_argument, &FreeBSD_Oflag, 1 },
{ "sctp", no_argument, &FreeBSD_sctp, 1 },
{ NULL, 0, NULL, 0 } { NULL, 0, NULL, 0 }
}; };
ret = 1; ret = 1;
ipsec_count = 0; ipsec_count = 0;
s = 0; s = 0;
socksv = 5; socksv = 5;
host = NULL; host = NULL;
▲ Show 20 Lines • Show All 148 Lines • ▼ Show 20 Lines case 'T':
optarg[1] == 'x') optarg[1] == 'x')
Tflag = (int)strtol(optarg, NULL, 16); Tflag = (int)strtol(optarg, NULL, 16);
else else
Tflag = (int)strtonum(optarg, 0, 255, Tflag = (int)strtonum(optarg, 0, 255,
&errstr); &errstr);
if (Tflag < 0 || Tflag > 255 || errstr || errno) if (Tflag < 0 || Tflag > 255 || errstr || errno)
errx(1, "illegal tos value %s", optarg); errx(1, "illegal tos value %s", optarg);
break; break;
case 0:
/* Long option. */
break;
default: default:
usage(1); usage(1);
} }
} }
argc -= optind; argc -= optind;
argv += optind; argv += optind;
/* Cruft to make sure options are clean, and used properly. */ /* Cruft to make sure options are clean, and used properly. */
Show All 14 Lines#endif
if (lflag && sflag) if (lflag && sflag)
errx(1, "cannot use -s and -l"); errx(1, "cannot use -s and -l");
if (lflag && pflag) if (lflag && pflag)
errx(1, "cannot use -p and -l"); errx(1, "cannot use -p and -l");
if (lflag && zflag) if (lflag && zflag)
errx(1, "cannot use -z and -l"); errx(1, "cannot use -z and -l");
if (!lflag && kflag) if (!lflag && kflag)
errx(1, "must use -l with -k"); errx(1, "must use -l with -k");
if (FreeBSD_sctp) {
if (uflag)
errx(1, "cannot use -u and --sctp");
if (family == AF_UNIX)
errx(1, "cannot use -U and --sctp");
}
/* Get name of temporary socket for unix datagram client */ /* Get name of temporary socket for unix datagram client */
if ((family == AF_UNIX) && uflag && !lflag) { if ((family == AF_UNIX) && uflag && !lflag) {
if (sflag) { if (sflag) {
unix_dg_tmp_socket = sflag; unix_dg_tmp_socket = sflag;
} else { } else {
strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX", strlcpy(unix_dg_tmp_socket_buf, "/tmp/nc.XXXXXXXXXX",
UNIX_DG_TMP_SOCKET_SIZE); UNIX_DG_TMP_SOCKET_SIZE);
if (mktemp(unix_dg_tmp_socket_buf) == NULL) if (mktemp(unix_dg_tmp_socket_buf) == NULL)
err(1, "mktemp"); err(1, "mktemp");
unix_dg_tmp_socket = unix_dg_tmp_socket_buf; unix_dg_tmp_socket = unix_dg_tmp_socket_buf;
} }
} }
/* Initialize addrinfo structure. */ /* Initialize addrinfo structure. */
if (family != AF_UNIX) { if (family != AF_UNIX) {
memset(&hints, 0, sizeof(struct addrinfo)); memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = family; hints.ai_family = family;
hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM; hints.ai_socktype = uflag ? SOCK_DGRAM : SOCK_STREAM;
hints.ai_protocol = uflag ? IPPROTO_UDP : IPPROTO_TCP; hints.ai_protocol = uflag ? IPPROTO_UDP :
FreeBSD_sctp ? IPPROTO_SCTP : IPPROTO_TCP;
if (nflag) if (nflag)
hints.ai_flags |= AI_NUMERICHOST; hints.ai_flags |= AI_NUMERICHOST;
} }
if (xflag) { if (xflag) {
if (uflag) if (uflag)
errx(1, "no proxy support for UDP mode"); errx(1, "no proxy support for UDP mode");
if (FreeBSD_sctp)
errx(1, "no proxy support for SCTP mode");
if (lflag) if (lflag)
errx(1, "no proxy support for listen"); errx(1, "no proxy support for listen");
if (family == AF_UNIX) if (family == AF_UNIX)
errx(1, "no proxy support for unix sockets"); errx(1, "no proxy support for unix sockets");
/* XXX IPv6 transport to proxy would probably work */ /* XXX IPv6 transport to proxy would probably work */
if (family == AF_INET6) if (family == AF_INET6)
▲ Show 20 Lines • Show All 1,026 Lines • ▼ Show 20 Lines#endif
\t-h This help text\n\ \t-h This help text\n\
\t-I length TCP receive buffer length\n\ \t-I length TCP receive buffer length\n\
\t-i secs\t Delay interval for lines sent, ports scanned\n\ \t-i secs\t Delay interval for lines sent, ports scanned\n\
\t-k Keep inbound sockets open for multiple connects\n\ \t-k Keep inbound sockets open for multiple connects\n\
\t-l Listen mode, for inbound connects\n\ \t-l Listen mode, for inbound connects\n\
\t-N Shutdown the network socket after EOF on stdin\n\ \t-N Shutdown the network socket after EOF on stdin\n\
\t-n Suppress name/port resolutions\n\ \t-n Suppress name/port resolutions\n\
\t--no-tcpopt Disable TCP options\n\ \t--no-tcpopt Disable TCP options\n\
\t--sctp\t SCTP mode\n\
\t-O length TCP send buffer length\n\ \t-O length TCP send buffer length\n\
\t-P proxyuser\tUsername for proxy authentication\n\ \t-P proxyuser\tUsername for proxy authentication\n\
\t-p port\t Specify local port for remote connects\n\ \t-p port\t Specify local port for remote connects\n\
\t-r Randomize remote ports\n\ \t-r Randomize remote ports\n\
\t-S Enable the TCP MD5 signature option\n\ \t-S Enable the TCP MD5 signature option\n\
\t-s addr\t Local source address\n\ \t-s addr\t Local source address\n\
\t-T toskeyword\tSet IP Type of Service\n\ \t-T toskeyword\tSet IP Type of Service\n\
\t-t Answer TELNET negotiation\n\ \t-t Answer TELNET negotiation\n\
\t-U Use UNIX domain socket\n\ \t-U Use UNIX domain socket\n\
\t-u UDP mode\n\ \t-u UDP mode\n\
\t-V rtable Specify alternate routing table\n\ \t-V rtable Specify alternate routing table\n\
\t-v Verbose\n\ \t-v Verbose\n\
\t-w secs\t Timeout for connects and final net reads\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 proto Proxy protocol: \"4\", \"5\" (SOCKS) or \"connect\"\n\
\t-x addr[:port]\tSpecify proxy address and port\n\ \t-x addr[:port]\tSpecify proxy address and port\n\
\t-z Zero-I/O mode [used for scanning]\n\ \t-z Zero-I/O mode [used for scanning]\n\
Port numbers can be individual or ranges: lo-hi [inclusive]\n"); Port numbers can be individual or ranges: lo-hi [inclusive]\n");
#ifdef IPSEC #ifdef IPSEC
fprintf(stderr, "See ipsec_set_policy(3) for -e argument format\n"); fprintf(stderr, "\tSee ipsec_set_policy(3) for -e argument format\n");
#endif #endif
exit(1); exit(1);
} }
#ifdef IPSEC #ifdef IPSEC
void void
add_ipsec_policy(int s, int af, char *policy) add_ipsec_policy(int s, int af, char *policy)
{ {
Show All 23 Lines
usage(int ret) usage(int ret)
{ {
fprintf(stderr, fprintf(stderr,
#ifdef IPSEC #ifdef IPSEC
"usage: nc [-46DdEFhklNnrStUuvz] [-e policy] [-I length] [-i interval] [-O length]\n" "usage: nc [-46DdEFhklNnrStUuvz] [-e policy] [-I length] [-i interval] [-O length]\n"
#else #else
"usage: nc [-46DdFhklNnrStUuvz] [-I length] [-i interval] [-O length]\n" "usage: nc [-46DdFhklNnrStUuvz] [-I length] [-i interval] [-O length]\n"
#endif #endif
"\t [--no-tcpopt] [--sctp]\n"
"\t [-P proxy_username] [-p source_port] [-s source] [-T ToS]\n" "\t [-P proxy_username] [-p source_port] [-s source] [-T ToS]\n"
"\t [-V rtable] [-w timeout] [-X proxy_protocol]\n" "\t [-V rtable] [-w timeout] [-X proxy_protocol]\n"
"\t [-x proxy_address[:port]] [destination] [port]\n"); "\t [-x proxy_address[:port]] [destination] [port]\n");
if (ret) if (ret)
exit(1); exit(1);
} }