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Adds zero-byte option(-z) for Ncat. Fixes #22 and #225

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This commit is contained in:
abhishek
2016-07-19 10:07:58 +00:00
parent 0c1d68d6de
commit d1a10dfc63
4 changed files with 52 additions and 7 deletions
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16
ncat/ncat_main.c
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@@ -334,7 +334,7 @@ int main(int argc, char *argv[])
while (1) {
/* handle command line arguments */
int option_index;
int c = getopt_long(argc, argv, "46UCc:e:g:G:i:km:hp:d:lo:x:ts:uvw:n",
int c = getopt_long(argc, argv, "46UCc:e:g:G:i:km:hp:d:lo:x:ts:uvw:n:z",
long_options, &option_index);
/* That's the end of the options. */
@@ -458,6 +458,9 @@ int main(int argc, char *argv[])
case 't':
o.telnet = 1;
break;
case 'z':
o.zerobyte = 1;
break;
case 0:
if (strcmp(long_options[option_index].name, "version") == 0) {
print_banner();
@@ -606,6 +609,7 @@ int main(int argc, char *argv[])
" --sctp Use SCTP instead of default TCP\n"
" -v, --verbose Set verbosity level (can be used several times)\n"
" -w, --wait <time> Connect timeout\n"
" -z Zero-I/O mode, report connection status only\n"
" --append-output Append rather than clobber specified output files\n"
" --send-only Only send data, ignoring received; quit on EOF\n"
" --recv-only Only receive data, never send anything\n"
@@ -723,6 +727,16 @@ int main(int argc, char *argv[])
}
}
if (o.zerobyte) {
if (o.listen)
bye("Services designed for LISTENING can't be used with -z");
if (o.telnet)
bye("Invalid option combination: -z and -t.");
if (o.execmode||o.cmdexec)
bye("Command execution can't be done along with option -z.");
if (!o.idletimeout && o.proto == IPPROTO_UDP)
o.idletimeout = 2 * 1000;
}
/* Default port */
if (o.listen && o.proxytype && !o.portno && srcport == -1)
o.portno = DEFAULT_PROXY_PORT;