*
* Copyright (C) 2007 Denys Vlasenko.
*
- * Licensed under GPLv2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
/* Author's comments from nc 1.10:
//usage:#define nc_trivial_usage
//usage: "[OPTIONS] HOST PORT - connect"
//usage: IF_NC_SERVER("\n"
-//usage: "nc [OPTIONS] -l -p PORT [HOST] [PORT] - listen")
+//usage: "nc [OPTIONS] -l -p PORT [HOST] [PORT] - listen"
+//usage: )
//usage:#define nc_full_usage "\n\n"
-//usage: "Options:"
-//usage: "\n -e PROG Run PROG after connect (must be last)"
+//usage: " -e PROG Run PROG after connect (must be last)"
//usage: IF_NC_SERVER(
//usage: "\n -l Listen mode, for inbound connects"
//usage: )
unsigned wrote_out; /* total stdout bytes */
unsigned wrote_net; /* total net bytes */
#endif
+ char *proggie0saved;
/* ouraddr is never NULL and goes through three states as we progress:
1 - local address before bind (IP/port possibly zero)
2 - local address after bind (port is nonzero)
jmp_buf jbuf; /* timer crud */
- /* will malloc up the following globals: */
fd_set ding1; /* for select loop */
fd_set ding2;
char bigbuf_in[BIGSIZ]; /* data buffers */
/* Must match getopt32 call! */
enum {
- OPT_h = (1 << 0),
- OPT_n = (1 << 1),
- OPT_p = (1 << 2),
- OPT_s = (1 << 3),
- OPT_u = (1 << 4),
- OPT_v = (1 << 5),
- OPT_w = (1 << 6),
- OPT_l = (1 << 7) * ENABLE_NC_SERVER,
- OPT_i = (1 << (7+ENABLE_NC_SERVER)) * ENABLE_NC_EXTRA,
- OPT_o = (1 << (8+ENABLE_NC_SERVER)) * ENABLE_NC_EXTRA,
- OPT_z = (1 << (9+ENABLE_NC_SERVER)) * ENABLE_NC_EXTRA,
+ OPT_n = (1 << 0),
+ OPT_p = (1 << 1),
+ OPT_s = (1 << 2),
+ OPT_u = (1 << 3),
+ OPT_v = (1 << 4),
+ OPT_w = (1 << 5),
+ OPT_l = (1 << 6) * ENABLE_NC_SERVER,
+ OPT_i = (1 << (6+ENABLE_NC_SERVER)) * ENABLE_NC_EXTRA,
+ OPT_o = (1 << (7+ENABLE_NC_SERVER)) * ENABLE_NC_EXTRA,
+ OPT_z = (1 << (8+ENABLE_NC_SERVER)) * ENABLE_NC_EXTRA,
};
#define o_nflag (option_mask32 & OPT_n)
static int doexec(char **proggie) NORETURN;
static int doexec(char **proggie)
{
+ if (G.proggie0saved)
+ proggie[0] = G.proggie0saved;
xmove_fd(netfd, 0);
dup2(0, 1);
/* dup2(0, 2); - do we *really* want this? NO!
* exec'ed prog can do it yourself, if needed */
- execvp(proggie[0], proggie);
- bb_perror_msg_and_die("can't execute '%s'", proggie[0]);
+ BB_EXECVP_or_die(proggie);
}
/* connect_w_timeout:
if (port == 0) {
/* "nc -nl -p LPORT RHOST" (w/o RPORT!):
* we should accept any remote port */
- set_nport(&remend, 0); /* blot out remote port# */
+ set_nport(&remend.u.sa, 0); /* blot out remote port# */
}
r = memcmp(&remend.u.sa, &themaddr->u.sa, remend.len);
- set_nport(&remend, sv_port); /* restore */
+ set_nport(&remend.u.sa, sv_port); /* restore */
if (r != 0) {
/* nc 1.10 bails out instead, and its error message
* is not suppressed by o_verbose */
rr = getsockopt(netfd, IPPROTO_IP, IP_OPTIONS, optbuf, &x);
if (rr >= 0 && x) { /* we've got options, lessee em... */
- bin2hex(bigbuf_net, optbuf, x);
- bigbuf_net[2*x] = '\0';
+ *bin2hex(bigbuf_net, optbuf, x) = '\0';
fprintf(stderr, "IP options: %s\n", bigbuf_net);
}
#endif
us to hang forever, and hit it */
o_wait = 5; /* enough that we'll notice?? */
rr = xsocket(ouraddr->u.sa.sa_family, SOCK_STREAM, 0);
- set_nport(themaddr, htons(SLEAZE_PORT));
+ set_nport(&themaddr->u.sa, htons(SLEAZE_PORT));
connect_w_timeout(rr);
/* don't need to restore themaddr's port, it's not used anymore */
close(rr);
{
char *str_p, *str_s;
IF_NC_EXTRA(char *str_i, *str_o;)
- char *themdotted = themdotted; /* gcc */
+ char *themdotted = themdotted; /* for compiler */
char **proggie;
int x;
unsigned o_lport = 0;
proggie++;
goto e_found;
}
+ /* -<other_opts>e PROG [ARGS] ? */
+ /* (aboriginal linux uses this form) */
+ if (proggie[0][0] == '-') {
+ char *optpos = *proggie + 1;
+ /* Skip all valid opts w/o params */
+ optpos = optpos + strspn(optpos, "nuv"IF_NC_SERVER("l")IF_NC_EXTRA("z"));
+ if (*optpos == 'e' && !optpos[1]) {
+ *optpos = '\0';
+ proggie++;
+ G.proggie0saved = *proggie;
+ *proggie = NULL; /* terminate argv for getopt32 */
+ goto e_found;
+ }
+ }
}
proggie = NULL;
e_found:
// -g -G -t -r deleted, unimplemented -a deleted too
opt_complementary = "?2:vv:w+"; /* max 2 params; -v is a counter; -w N */
- getopt32(argv, "hnp:s:uvw:" IF_NC_SERVER("l")
+ getopt32(argv, "np:s:uvw:" IF_NC_SERVER("l")
IF_NC_EXTRA("i:o:z"),
&str_p, &str_s, &o_wait
- IF_NC_EXTRA(, &str_i, &str_o, &o_verbose));
+ IF_NC_EXTRA(, &str_i, &str_o), &o_verbose);
argv += optind;
#if ENABLE_NC_EXTRA
if (option_mask32 & OPT_i) /* line-interval time */
(themaddr ? themaddr->u.sa.sa_family : AF_UNSPEC),
x);
if (o_lport)
- set_nport(ouraddr, htons(o_lport));
+ set_nport(&ouraddr->u.sa, htons(o_lport));
}
xmove_fd(x, netfd);
setsockopt_reuseaddr(netfd);
} else {
/* Outbound connects. Now we're more picky about args... */
if (!themaddr)
- bb_error_msg_and_die("no destination");
+ bb_show_usage();
remend = *themaddr;
if (o_verbose)