Add ngctl "write" command.

MFC after:	1 week

1 files changed, 111 insertions, 0 deletions

diff --git a/usr.sbin/ngctl/write.c b/usr.sbin/ngctl/write.c
new file mode 100644
index 000000000000..d1bdca09427e
--- /dev/null
+++ b/usr.sbin/ngctl/write.c
@@ -0,0 +1,111 @@
+
+/*
+ * write.c
+ *
+ * Copyright (c) 2002 Archie L. Cobbs
+ * All rights reserved.
+ * 
+ * Subject to the following obligations and disclaimer of warranty, use and
+ * redistribution of this software, in source or object code forms, with or
+ * without modifications are expressly permitted by Archie L. Cobbs;
+ * provided, however, that:
+ * 1. Any and all reproductions of the source or object code must include the
+ *    copyright notice above and the following disclaimer of warranties
+ * 
+ * THIS SOFTWARE IS BEING PROVIDED BY ARCHIE L. COBBS AS IS", AND TO
+ * THE MAXIMUM EXTENT PERMITTED BY LAW, ARCHIE L. COBBS MAKES NO
+ * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
+ * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
+ * ARCHIE L. COBBS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
+ * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
+ * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
+ * IN NO EVENT SHALL ARCHIE L. COBBS BE LIABLE FOR ANY DAMAGES
+ * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
+ * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+ * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ARCHIE L. COBBS IS ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include "ngctl.h"
+
+#define BUF_SIZE	8192
+
+static int WriteCmd(int ac, char **av);
+
+const struct ngcmd write_cmd = {
+	WriteCmd,
+	"write hook < -f file | byte ... >",
+	"Send a data packet down the hook named by \"hook\".",
+	"The data may be contained in a file, or may be described directly"
+	" on the command line by supplying a sequence of bytes.",
+	{ "w" }
+};
+
+static int
+WriteCmd(int ac, char **av)
+{
+	u_int32_t sagbuf[64];
+	struct sockaddr_ng *sag = (struct sockaddr_ng *)sagbuf;
+	u_char buf[BUF_SIZE];
+	const char *hook;
+	FILE *fp;
+	u_int len;
+	int byte;
+	int i;
+
+	/* Get arguments */
+	if (ac < 3)
+		return(CMDRTN_USAGE);
+	hook = av[1];
+
+	/* Get data */
+	if (strcmp(av[2], "-f") == 0) {
+		if (ac != 4)
+			return(CMDRTN_USAGE);
+		if ((fp = fopen(av[3], "r")) == NULL) {
+			warn("can't read file \"%s\"", av[3]);
+			return(CMDRTN_ERROR);
+		}
+		if ((len = fread(buf, 1, sizeof(buf), fp)) == 0) {
+			if (ferror(fp))
+				warn("can't read file \"%s\"", av[3]);
+			else
+				warnx("file \"%s\" is empty", av[3]);
+			fclose(fp);
+			return(CMDRTN_ERROR);
+		}
+		fclose(fp);
+	} else {
+		for (i = 2, len = 0; i < ac && len < sizeof(buf); i++, len++) {
+			if (sscanf(av[i], "%i", &byte) != 1
+			    || (byte < -128 || byte > 255)) {
+				warnx("invalid byte \"%s\"", av[i]);
+				return(CMDRTN_ERROR);
+			}
+			buf[len] = (u_char)byte;
+		}
+		if (len == 0)
+			return(CMDRTN_USAGE);
+	}
+
+	/* Send data */
+	sag->sg_len = 3 + strlen(hook);
+	sag->sg_family = AF_NETGRAPH;
+	strlcpy(sag->sg_data, hook, sizeof(sagbuf) - 2);
+	if (sendto(dsock, buf, len,
+	    0, (struct sockaddr *)sag, sag->sg_len) == -1) {
+		warn("writing to hook \"%s\"", hook);
+		return(CMDRTN_ERROR);
+	}
+
+	/* Done */
+	return(CMDRTN_OK);
+}
+