* - TCP connects from wrong ip/ports (if peer ip:port is specified
* on the command line, but accept() says that it came from different addr)
* are closed, but we don't exit - we continue to listen/accept.
+ * Since bbox 1.22:
+ * - nc exits when _both_ stdin and network are closed.
+ * This makes these two commands:
+ * echo "Yes" | nc 127.0.0.1 1234
+ * echo "no" | nc -lp 1234
+ * exchange their data _and exit_ instead of being stuck.
*/
/* done in nc.c: #include "libbb.h" */
//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: "\n -lk With -e, provides persistent server"
+/* -ll does the same as -lk, but its our extension, while -k is BSD'd,
+ * presumably more widely known. Therefore we advertise it, not -ll.
+ * I would like to drop -ll support, but our "small" nc supports it,
+ * and Rob uses it.
+ */
//usage: )
//usage: "\n -p PORT Local port"
//usage: "\n -s ADDR Local address"
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 */
char bigbuf_net[BIGSIZ];
};
#define themaddr (G.themaddr )
#define remend (G.remend )
#define jbuf (G.jbuf )
-#define ding1 (G.ding1 )
-#define ding2 (G.ding2 )
#define bigbuf_in (G.bigbuf_in )
#define bigbuf_net (G.bigbuf_net)
#define o_verbose (G.o_verbose )
/* 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_k = (1 << 7) * ENABLE_NC_SERVER,
+ OPT_i = (1 << (6+2*ENABLE_NC_SERVER)) * ENABLE_NC_EXTRA,
+ OPT_o = (1 << (7+2*ENABLE_NC_SERVER)) * ENABLE_NC_EXTRA,
+ OPT_z = (1 << (8+2*ENABLE_NC_SERVER)) * ENABLE_NC_EXTRA,
};
#define o_nflag (option_mask32 & OPT_n)
#define o_udpmode (option_mask32 & OPT_u)
-#if ENABLE_NC_SERVER
-#define o_listen (option_mask32 & OPT_l)
-#else
-#define o_listen 0
-#endif
#if ENABLE_NC_EXTRA
#define o_ofile (option_mask32 & OPT_o)
#define o_zero (option_mask32 & OPT_z)
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:
incoming and returns an open connection *from* someplace. If we were
given host/port args, any connections from elsewhere are rejected. This
in conjunction with local-address binding should limit things nicely... */
-static void dolisten(void)
+static void dolisten(int is_persistent, char **proggie)
{
int rr;
xconnect(netfd, &remend.u.sa, ouraddr->len);
} else {
/* TCP */
+ another:
arm(o_wait); /* wrap this in a timer, too; 0 = forever */
if (setjmp(jbuf) == 0) {
again:
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 */
unarm();
} else
bb_error_msg_and_die("timeout");
+
+ if (is_persistent && proggie) {
+ /* -l -k -e PROG */
+ signal(SIGCHLD, SIG_IGN); /* no zombies please */
+ if (xvfork() != 0) {
+ /* parent: go back and accept more connections */
+ close(rr);
+ goto another;
+ }
+ /* child */
+ signal(SIGCHLD, SIG_DFL);
+ }
+
xmove_fd(rr, netfd); /* dump the old socket, here's our new one */
/* find out what address the connection was *to* on our end, in case we're
doing a listen-on-any on a multihomed machine. This allows one to
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
so I don't feel bad.
The *real* question is why BFD sockets wasn't designed to allow listens for
connections *from* specific hosts/ports, instead of requiring the caller to
- accept the connection and then reject undesireable ones by closing.
+ accept the connection and then reject undesirable ones by closing.
In other words, we need a TCP MSG_PEEK. */
/* bbox: removed most of it */
lcladdr = xmalloc_sockaddr2dotted(&ouraddr->u.sa);
if (!o_nflag)
free(remhostname);
}
+
+ if (proggie)
+ doexec(proggie);
}
/* udptest:
/* use the tcp-ping trick: try connecting to a normally refused port, which
causes us to block for the time that SYN gets there and RST gets back.
Not completely reliable, but it *does* mostly work. */
- /* Set a temporary connect timeout, so packet filtration doesnt cause
+ /* Set a temporary connect timeout, so packet filtration doesn't cause
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);
#endif
/* readwrite:
- handle stdin/stdout/network I/O. Bwahaha!! -- the select loop from hell.
+ handle stdin/stdout/network I/O. Bwahaha!! -- the i/o loop from hell.
In this instance, return what might become our exit status. */
static int readwrite(void)
{
- int rr;
char *zp = zp; /* gcc */ /* stdin buf ptr */
char *np = np; /* net-in buf ptr */
unsigned rzleft;
unsigned rnleft;
unsigned netretry; /* net-read retry counter */
- unsigned wretry; /* net-write sanity counter */
- unsigned wfirst; /* one-shot flag to skip first net read */
+ unsigned fds_open;
- /* if you don't have all this FD_* macro hair in sys/types.h, you'll have to
- either find it or do your own bit-bashing: *ding1 |= (1 << fd), etc... */
- FD_SET(netfd, &ding1); /* global: the net is open */
+ struct pollfd pfds[2];
+ pfds[0].fd = STDIN_FILENO;
+ pfds[0].events = POLLIN;
+ pfds[1].fd = netfd;
+ pfds[1].events = POLLIN;
+
+ fds_open = 2;
netretry = 2;
- wfirst = 0;
rzleft = rnleft = 0;
if (o_interval)
sleep(o_interval); /* pause *before* sending stuff, too */
- errno = 0; /* clear from sleep, close, whatever */
- /* and now the big ol' select shoveling loop ... */
- while (FD_ISSET(netfd, &ding1)) { /* i.e. till the *net* closes! */
- wretry = 8200; /* more than we'll ever hafta write */
- if (wfirst) { /* any saved stdin buffer? */
- wfirst = 0; /* clear flag for the duration */
- goto shovel; /* and go handle it first */
- }
- ding2 = ding1; /* FD_COPY ain't portable... */
- /* some systems, notably linux, crap into their select timers on return, so
- we create a expendable copy and give *that* to select. */
+ /* and now the big ol' shoveling loop ... */
+ /* nc 1.10 has "while (FD_ISSET(netfd)" here */
+ while (fds_open) {
+ int rr;
+ int poll_tmout_ms;
+ unsigned wretry = 8200; /* net-write sanity counter */
+
+ poll_tmout_ms = -1;
if (o_wait) {
- struct timeval tmp_timer;
- tmp_timer.tv_sec = o_wait;
- tmp_timer.tv_usec = 0;
- /* highest possible fd is netfd (3) */
- rr = select(netfd+1, &ding2, NULL, NULL, &tmp_timer);
- } else
- rr = select(netfd+1, &ding2, NULL, NULL, NULL);
+ poll_tmout_ms = INT_MAX;
+ if (o_wait < INT_MAX / 1000)
+ poll_tmout_ms = o_wait * 1000;
+ }
+ rr = poll(pfds, 2, poll_tmout_ms);
if (rr < 0 && errno != EINTR) { /* might have gotten ^Zed, etc */
- holler_perror("select");
+ holler_perror("poll");
close(netfd);
return 1;
}
/* if we have a timeout AND stdin is closed AND we haven't heard anything
from the net during that time, assume it's dead and close it too. */
if (rr == 0) {
- if (!FD_ISSET(STDIN_FILENO, &ding1))
+ if (!pfds[0].revents) {
netretry--; /* we actually try a coupla times. */
- if (!netretry) {
- if (o_verbose > 1) /* normally we don't care */
- fprintf(stderr, "net timeout\n");
- close(netfd);
- return 0; /* not an error! */
+ if (!netretry) {
+ if (o_verbose > 1) /* normally we don't care */
+ fprintf(stderr, "net timeout\n");
+ /*close(netfd); - redundant, exit will do it */
+ return 0; /* not an error! */
+ }
}
- } /* select timeout */
- /* xxx: should we check the exception fds too? The read fds seem to give
- us the right info, and none of the examples I found bothered. */
+ } /* timeout */
/* Ding!! Something arrived, go check all the incoming hoppers, net first */
- if (FD_ISSET(netfd, &ding2)) { /* net: ding! */
+ if (pfds[1].revents) { /* net: ding! */
rr = read(netfd, bigbuf_net, BIGSIZ);
if (rr <= 0) {
if (rr < 0 && o_verbose > 1) {
/* nc 1.10 doesn't do this */
bb_perror_msg("net read");
}
- FD_CLR(netfd, &ding1); /* net closed, we'll finish up... */
+ pfds[1].fd = -1; /* don't poll for netfd anymore */
+ fds_open--;
rzleft = 0; /* can't write anymore: broken pipe */
} else {
rnleft = rr;
goto shovel;
/* okay, suck more stdin */
- if (FD_ISSET(STDIN_FILENO, &ding2)) { /* stdin: ding! */
+ if (pfds[0].revents) { /* stdin: ding! */
rr = read(STDIN_FILENO, bigbuf_in, BIGSIZ);
/* Considered making reads here smaller for UDP mode, but 8192-byte
mobygrams are kinda fun and exercise the reassembler. */
if (rr <= 0) { /* at end, or fukt, or ... */
- FD_CLR(STDIN_FILENO, &ding1); /* disable and close stdin */
- close(STDIN_FILENO);
-// Does it make sense to shutdown(net_fd, SHUT_WR)
-// to let other side know that we won't write anything anymore?
-// (and what about keeping compat if we do that?)
+ pfds[0].fd = -1; /* disable stdin */
+ /*close(STDIN_FILENO); - not really necessary */
+ /* Let peer know we have no more data */
+ /* nc 1.10 doesn't do this: */
+ shutdown(netfd, SHUT_WR);
+ fds_open--;
} else {
rzleft = rr;
zp = bigbuf_in;
Geez, why does this look an awful lot like the big loop in "rsh"? ...
not sure if the order of this matters, but write net -> stdout first. */
- /* sanity check. Works because they're both unsigned... */
- if ((rzleft > 8200) || (rnleft > 8200)) {
- holler_error("bogus buffers: %u, %u", rzleft, rnleft);
- rzleft = rnleft = 0;
- }
- /* net write retries sometimes happen on UDP connections */
- if (!wretry) { /* is something hung? */
- holler_error("too many output retries");
- return 1;
- }
if (rnleft) {
rr = write(STDOUT_FILENO, np, rnleft);
if (rr > 0) {
if (o_ofile) /* log the stdout */
oprint('<', (unsigned char *)np, rr);
- np += rr; /* fix up ptrs and whatnot */
- rnleft -= rr; /* will get sanity-checked above */
- wrote_out += rr; /* global count */
+ np += rr;
+ rnleft -= rr;
+ wrote_out += rr; /* global count */
}
Debug("wrote %d to stdout, errno %d", rr, errno);
} /* rnleft */
oprint('>', (unsigned char *)zp, rr);
zp += rr;
rzleft -= rr;
- wrote_net += rr; /* global count */
+ wrote_net += rr; /* global count */
}
Debug("wrote %d to net, errno %d", rr, errno);
} /* rzleft */
if (o_interval) { /* cycle between slow lines, or ... */
sleep(o_interval);
- errno = 0; /* clear from sleep */
- continue; /* ...with hairy select loop... */
+ continue; /* ...with hairy loop... */
}
- if ((rzleft) || (rnleft)) { /* shovel that shit till they ain't */
+ if (rzleft || rnleft) { /* shovel that shit till they ain't */
wretry--; /* none left, and get another load */
+ /* net write retries sometimes happen on UDP connections */
+ if (!wretry) { /* is something hung? */
+ holler_error("too many output retries");
+ return 1;
+ }
goto shovel;
}
- } /* while ding1:netfd is open */
+ } /* while (fds_open) */
/* XXX: maybe want a more graceful shutdown() here, or screw around with
linger times?? I suspect that I don't need to since I'm always doing
{
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 cnt_l = 0;
unsigned o_lport = 0;
INIT_G();
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("lk")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")
- IF_NC_EXTRA("i:o:z"),
- &str_p, &str_s, &o_wait
- IF_NC_EXTRA(, &str_i, &str_o), &o_verbose);
+ getopt32(argv, "^"
+ "np:s:uvw:+"/* -w N */ IF_NC_SERVER("lk")
+ IF_NC_EXTRA("i:o:z")
+ "\0"
+ "?2:vv:ll", /* max 2 params; -v and -l are counters */
+ &str_p, &str_s, &o_wait
+ IF_NC_EXTRA(, &str_i, &str_o)
+ , &o_verbose IF_NC_SERVER(, &cnt_l)
+ );
argv += optind;
#if ENABLE_NC_EXTRA
if (option_mask32 & OPT_i) /* line-interval time */
o_interval = xatou_range(str_i, 1, 0xffff);
#endif
+#if ENABLE_NC_SERVER
//if (option_mask32 & OPT_l) /* listen mode */
+ if (option_mask32 & OPT_k) /* persistent server mode */
+ cnt_l = 2;
+#endif
//if (option_mask32 & OPT_n) /* numeric-only, no DNS lookups */
//if (option_mask32 & OPT_o) /* hexdump log */
if (option_mask32 & OPT_p) { /* local source port */
(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);
if (o_udpmode)
socket_want_pktinfo(netfd);
if (!ENABLE_FEATURE_UNIX_LOCAL
- || o_listen
+ || cnt_l != 0 /* listen */
|| ouraddr->u.sa.sa_family != AF_UNIX
) {
xbind(netfd, &ouraddr->u.sa, ouraddr->len);
}
#if 0
- setsockopt(netfd, SOL_SOCKET, SO_RCVBUF, &o_rcvbuf, sizeof o_rcvbuf);
- setsockopt(netfd, SOL_SOCKET, SO_SNDBUF, &o_sndbuf, sizeof o_sndbuf);
+ setsockopt_SOL_SOCKET_int(netfd, SO_RCVBUF, o_rcvbuf);
+ setsockopt_SOL_SOCKET_int(netfd, SO_SNDBUF, o_sndbuf);
#endif
#ifdef BLOAT
}
#endif
- FD_SET(STDIN_FILENO, &ding1); /* stdin *is* initially open */
if (proggie) {
- close(0); /* won't need stdin */
+ close(STDIN_FILENO); /* won't need stdin */
option_mask32 &= ~OPT_o; /* -o with -e is meaningless! */
}
#if ENABLE_NC_EXTRA
xmove_fd(xopen(str_o, O_WRONLY|O_CREAT|O_TRUNC), ofd);
#endif
- if (o_listen) {
- dolisten();
+ if (cnt_l != 0) {
+ dolisten((cnt_l - 1), proggie);
/* dolisten does its own connect reporting */
- if (proggie) /* -e given? */
- doexec(proggie);
x = readwrite(); /* it even works with UDP! */
} else {
/* Outbound connects. Now we're more picky about args... */
projects / oweals / busybox.git / blobdiff