Move commands into "posix", "lsb", and "other" menus/directories.

1 files changed, 232 insertions, 0 deletions

diff --git a/toys/other/netcat.c b/toys/other/netcat.c
new file mode 100644
index 00000000..3da19127
--- /dev/null
+++ b/toys/other/netcat.c
@@ -0,0 +1,232 @@
+/* vi: set sw=4 ts=4:
+ *
+ * nc: mini-netcat - Forward stdin/stdout to a file or network connection.
+ *
+ * Copyright 2007 Rob Landley <rob@landley.net>
+ *
+ * Not in SUSv3.
+
+USE_NETCAT(OLDTOY(nc, netcat, USE_NETCAT_LISTEN("tl^L^")"w#p#s:q#f:", TOYFLAG_BIN))
+USE_NETCAT(NEWTOY(netcat, USE_NETCAT_LISTEN("tl^L^")"w#p#s:q#f:", TOYFLAG_BIN))
+
+config NETCAT
+	bool "netcat"
+	default y
+	help
+	  usage: netcat [-wpq #] [-s addr] {IPADDR PORTNUM|-f FILENAME|-let} [-e COMMAND]
+
+	  -w	SECONDS timeout for connection
+	  -p	local port number
+	  -s	local ipv4 address
+	  -q	SECONDS quit this many seconds after EOF on stdin.
+	  -f	use FILENAME (ala /dev/ttyS0) instead of network
+
+	  Use "stty 115200 -F /dev/ttyS0 && stty raw -echo -ctlecho" with
+	  netcat -f to connect to a serial port.
+
+
+config NETCAT_LISTEN
+	bool "netcat sever options (-let)"
+	default y
+	depends on NETCAT
+	help
+	  -t    allocate tty (must come before -l or -L)
+	  -l	listen for one incoming connection.
+	  -L	listen for multiple incoming connections (server mode).
+
+	  Any additional command line arguments after -l or -L are executed
+	  to handle each incoming connection.  If none, the connection is
+	  forwarded to stdin/stdout.
+
+	  For a quick-and-dirty server, try something like:
+		netcat -s 127.0.0.1 -p 1234 -tL /bin/bash -l
+*/
+
+#include "toys.h"
+#include "toynet.h"
+
+DEFINE_GLOBALS(
+	char *filename;        // -f read from filename instead of network
+	long quit_delay;       // -q Exit after EOF from stdin after # seconds.
+	char *source_address;  // -s Bind to a specific source address.
+	long port;             // -p Bind to a specific source port.
+	long wait;             // -w Wait # seconds for a connection.
+)
+
+#define TT this.netcat
+
+#define FLAG_f   1
+#define FLAG_L  32
+#define FLAG_l  64
+#define FLAG_t 128
+
+static void timeout(int signum)
+{
+	if (TT.wait) error_exit("Timeout");
+	exit(0);
+}
+
+static void set_alarm(int seconds)
+{
+	signal(SIGALRM, seconds ? timeout : SIG_DFL);
+	alarm(seconds);
+}
+
+// Translate x.x.x.x numeric IPv4 address, or else DNS lookup an IPv4 name.
+static void lookup_name(char *name, uint32_t *result)
+{
+	struct hostent *hostbyname;
+
+	hostbyname = gethostbyname(name);
+	if (!hostbyname) error_exit("no host '%s'", name);
+	*result = *(uint32_t *)*hostbyname->h_addr_list;
+}
+
+// Worry about a fancy lookup later.
+static void lookup_port(char *str, uint16_t *port)
+{
+  *port = SWAP_BE16(atoi(str));
+}
+
+void netcat_main(void)
+{
+	int sockfd=-1, pollcount=2;
+	struct pollfd pollfds[2];
+
+	memset(pollfds, 0, 2*sizeof(struct pollfd));
+	pollfds[0].events = pollfds[1].events = POLLIN;
+	set_alarm(TT.wait);
+
+	// The argument parsing logic can't make "<2" conditional on other
+	// arguments like -f and -l, so we do it by hand here.
+	if (toys.optflags&FLAG_f) {
+		if (toys.optc) toys.exithelp++;
+	} else if (!(toys.optflags&(FLAG_l|FLAG_L)) && toys.optc!=2) toys.exithelp++;
+
+	if (toys.exithelp) error_exit("Argument count wrong");
+
+	if (TT.filename) pollfds[0].fd = xopen(TT.filename, O_RDWR);
+	else {
+		int temp;
+		struct sockaddr_in address;
+
+		// Setup socket
+		sockfd = socket(AF_INET, SOCK_STREAM, 0);
+		if (-1 == sockfd) perror_exit("socket");
+		fcntl(sockfd, F_SETFD, FD_CLOEXEC);
+		temp = 1;
+		setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &temp, sizeof(temp));
+		memset(&address, 0, sizeof(address));
+		address.sin_family = AF_INET;
+		if (TT.source_address || TT.port) {
+			address.sin_port = SWAP_BE16(TT.port);
+			if (TT.source_address) 
+				lookup_name(TT.source_address, (uint32_t *)&address.sin_addr);
+			if (bind(sockfd, (struct sockaddr *)&address, sizeof(address)))
+				perror_exit("bind");
+		}
+
+		// Dial out
+
+		if (!CFG_NETCAT_LISTEN || !(toys.optflags&(FLAG_L|FLAG_l))) {
+			// Figure out where to dial out to.
+			lookup_name(*toys.optargs, (uint32_t *)&address.sin_addr);
+			lookup_port(toys.optargs[1], &address.sin_port);
+			temp = connect(sockfd, (struct sockaddr *)&address, sizeof(address));
+			if (temp<0) perror_exit("connect");
+			pollfds[0].fd = sockfd;
+
+		// Listen for incoming connections
+
+		} else {
+			socklen_t len = sizeof(address);
+
+			if (listen(sockfd, 5)) error_exit("listen");
+			if (!TT.port) {
+				getsockname(sockfd, (struct sockaddr *)&address, &len);
+				printf("%d\n", SWAP_BE16(address.sin_port));
+				fflush(stdout);
+			}
+			// Do we need to return immediately because -l has arguments?
+
+			if ((toys.optflags&FLAG_l) && toys.optc) {
+				if (fork()) goto cleanup;
+				close(0);
+				close(1);
+				close(2);
+			}
+
+			for (;;) {
+				pid_t child = 0;
+
+				// For -l, call accept from the _new_ thread.
+
+				pollfds[0].fd = accept(sockfd, (struct sockaddr *)&address,
+					&len);
+				if (pollfds[0].fd<0) perror_exit("accept");
+
+				// Do we need a tty?
+
+				if (toys.optflags&FLAG_t)
+					child = forkpty(&(pollfds[1].fd), NULL, NULL, NULL);
+
+				// Do we need to fork and/or redirect for exec?
+
+				else {
+					if (toys.optflags&FLAG_L) child = fork();
+					if (!child && toys.optc) {
+						int fd = pollfds[0].fd;
+
+						if (!temp) close(sockfd);
+						dup2(fd, 0);
+						dup2(fd, 1);
+						dup2(fd, 2);
+						if (fd>2) close(fd);
+					}
+				}
+
+				if (child<0) error_msg("Fork failed\n");
+				if (child<1) break;
+				close(pollfds[0].fd);
+			}
+		}
+	}
+
+	// We have a connection.  Disarm timeout.
+	// (Does not play well with -L, but what _should_ that do?)
+	set_alarm(0);
+
+	if (CFG_NETCAT_LISTEN && (toys.optflags&(FLAG_L|FLAG_l) && toys.optc)) {
+		execvp(*toys.optargs, toys.optargs);
+		error_exit("Exec failed");
+	}
+
+	// Poll loop copying stdin->socket and socket->stdout.
+	for (;;) {
+		int i;
+
+		if (0>poll(pollfds, pollcount, -1)) perror_exit("poll");
+
+		for (i=0; i<pollcount; i++) {
+			if (pollfds[i].revents & POLLIN) {
+				int len = read(pollfds[i].fd, toybuf, sizeof(toybuf));
+				if (len<1) goto dohupnow;
+				xwrite(i ? pollfds[0].fd : 1, toybuf, len);
+			} else if (pollfds[i].revents & POLLHUP) {
+dohupnow:
+				// Close half-connection.  This is needed for things like
+				// "echo GET / | netcat landley.net 80"
+				if (i) {
+					shutdown(pollfds[0].fd, SHUT_WR);
+					pollcount--;
+					set_alarm(TT.quit_delay);
+				} else goto cleanup;
+			}
+		}
+	}
+cleanup:
+	if (CFG_TOYBOX_FREE) {
+		close(pollfds[0].fd);
+		close(sockfd);
+	}
+}