/*
 * msg.c
 *
 * Copyright (c) 1999 Whistle Communications, Inc.
 * 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 Whistle Communications;
 * 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; and
 * 2. No rights are granted, in any manner or form, to use Whistle
 *    Communications, Inc. trademarks, including the mark "WHISTLE
 *    COMMUNICATIONS" on advertising, endorsements, or otherwise except as
 *    such appears in the above copyright notice or in the software.
 *
 * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
 * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS 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.
 * WHISTLE COMMUNICATIONS 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 WHISTLE COMMUNICATIONS 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * $Whistle: msg.c,v 1.2 1999/11/29 23:38:35 archie Exp $
 */

#include <err.h>
#include <netgraph.h>
#include <poll.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>

#include "ngctl.h"

static int MsgCmd(int ac, char **av);

const struct ngcmd msg_cmd = {
        MsgCmd,
        "msg path command [args ... ]",
        "Send a netgraph control message to the node at \"path\"",
        "The msg command constructs a netgraph control message from the"
        " command name and ASCII arguments (if any) and sends that message"
        " to the node.  It does this by first asking the node to convert"
        " the ASCII message into binary format, and resending the result.",
        { "cmd" }
};

static int
MsgCmd(int ac, char **av)
{
        struct pollfd pfds[1] = {
                { .fd = csock, .events = POLLIN },
        };
        char *buf;
        char *path, *cmdstr;
        int i, len;

        /* Get arguments */
        if (ac < 3)
                return (CMDRTN_USAGE);
        path = av[1];
        cmdstr = av[2];

        /* Put command and arguments back together as one string */
        for (len = 1, i = 3; i < ac; i++)
                len += strlen(av[i]) + 1;
        if ((buf = malloc(len)) == NULL) {
                warn("malloc");
                return (CMDRTN_ERROR);
        }
        for (*buf = '\0', i = 3; i < ac; i++) {
                snprintf(buf + strlen(buf),
                    len - strlen(buf), " %s", av[i]);
        }

        /* Send it */
        if (NgSendAsciiMsg(csock, path, "%s%s", cmdstr, buf) < 0) {
                free(buf);
                warn("send msg");
                return (CMDRTN_ERROR);
        }
        free(buf);

        /* See if a synchronous reply awaits */
        switch (poll(pfds, 1, 0)) {
        case -1:
                err(EX_OSERR, "poll");
        case 0:
                break;
        default:
                MsgRead();
                break;
        }

        /* Done */
        return (CMDRTN_OK);
}

/*
 * Read and display the next incoming control message
 */
void
MsgRead(void)
{
        struct ng_mesg *m, *m2;
        struct ng_mesg *ascii;
        char path[NG_PATHSIZ];

        /* Get incoming message (in binary form) */
        if (NgAllocRecvMsg(csock, &m, path) < 0) {
                warn("recv incoming message");
                return;
        }

        /* Ask originating node to convert message to ASCII */
        if (NgSendMsg(csock, path, NGM_GENERIC_COOKIE,
              NGM_BINARY2ASCII, m, sizeof(*m) + m->header.arglen) < 0 ||
            NgAllocRecvMsg(csock, &m2, NULL) < 0) {
                printf("Rec'd %s %d from \"%s\":\n",
                    (m->header.flags & NGF_RESP) != 0 ? "response" : "command",
                    m->header.cmd, path);
                if (m->header.arglen == 0)
                        printf("No arguments\n");
                else
                        DumpAscii((const u_char *)m->data, m->header.arglen);
                free(m);
                return;
        }

        /* Display message in ASCII form */
        free(m);
        ascii = (struct ng_mesg *)m2->data;
        printf("Rec'd %s \"%s\" (%d) from \"%s\":\n",
            (ascii->header.flags & NGF_RESP) != 0 ? "response" : "command",
            ascii->header.cmdstr, ascii->header.cmd, path);
        if (*ascii->data != '\0')
                printf("Args:\t%s\n", ascii->data);
        else
                printf("No arguments\n");
        free(m2);
}