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cli_common.c

/*-
 * Copyright (c) 2006 Verdens Gang AS
 * Copyright (c) 2006 Linpro AS
 * All rights reserved.
 *
 * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON 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 ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id: cli_common.c 1184 2006-10-18 14:27:16Z des $
 */

#include <sys/types.h>
#include <sys/uio.h>

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <poll.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include "vsb.h"

#include "cli.h"
#include "cli_priv.h"
#include "cli_common.h"

void
cli_out(struct cli *cli, const char *fmt, ...)
{
      va_list ap;

      va_start(ap, fmt);
      if (cli != NULL)
            vsb_vprintf(cli->sb, fmt, ap);
      else
            vfprintf(stdout, fmt, ap);
      va_end(ap);
}

void
cli_result(struct cli *cli, unsigned res)
{

      if (cli != NULL)
            cli->result = res;
      else
            printf("CLI result = %d\n", res);
}


void
cli_param(struct cli *cli)
{

      cli_result(cli, CLIS_PARAM);
      cli_out(cli, "Parameter error, use \"help [command]\" for more info.\n");
}

int
cli_writeres(int fd, struct cli *cli)
{
      int i, l;
      struct iovec iov[3];
      char res[CLI_LINE0_LEN + 2];  /*
                               * NUL + one more so we can catch
                               * any misformats by snprintf
                               */

      assert(cli->result >= 100);
      assert(cli->result <= 999);
      i = snprintf(res, sizeof res,
          "%-3d %-8d\n", cli->result, vsb_len(cli->sb));
      assert(i == CLI_LINE0_LEN);
      iov[0].iov_base = (void*)(uintptr_t)res;
      iov[1].iov_base = (void*)(uintptr_t)vsb_data(cli->sb);
      iov[2].iov_base = (void*)(uintptr_t)"\n";
      for (l = i = 0; i < 3; i++) {
            iov[i].iov_len = strlen(iov[i].iov_base);
            l += iov[i].iov_len;
      }
      i = writev(fd, iov, 3);
      return (i != l);
}

static int
read_tmo(int fd, char *ptr, unsigned len, double tmo)
{
      int i, j;
      struct pollfd pfd;

      pfd.fd = fd;
      pfd.events = POLLIN;
      i = poll(&pfd, 1, (int)(tmo * 1e3));
      if (i == 0) {
            errno = ETIMEDOUT;
            return (-1);
      }
      for (j = 0; len > 0; ) {
            i = read(fd, ptr, len);
            if (i < 0)
                  return (i);
            if (i == 0)
                  break;
            len -= i;
            ptr += i;
            j += i;
      }
      return (j);
}

int
cli_readres(int fd, unsigned *status, char **ptr, double tmo)
{
      char res[CLI_LINE0_LEN];      /* For NUL */
      int i, j;
      unsigned u, v;
      char *p;

      i = read_tmo(fd, res, CLI_LINE0_LEN, tmo);
      if (i != CLI_LINE0_LEN) {
            if (status != NULL)
                  *status = CLIS_COMMS;
            if (ptr != NULL)
                  *ptr = strdup("CLI communication error");
            return (1);
      }
      assert(i == CLI_LINE0_LEN);
      assert(res[3] == ' ');
      assert(res[CLI_LINE0_LEN - 1] == '\n');
      j = sscanf(res, "%u %u\n", &u, &v);
      assert(j == 2);
      if (status != NULL)
            *status = u;
      p = malloc(v + 1);
      assert(p != NULL);
      i = read_tmo(fd, p, v + 1, tmo);
      if (i < 0) {
            free(p);
            return (i);
      }
      assert(i == v + 1);
      assert(p[v] == '\n');
      p[v] = '\0';
      if (ptr == NULL)
            free(p);
      else
            *ptr = p;
      return (0);
}

/*--------------------------------------------------------------------*/

void
cli_func_ping(struct cli *cli, char **av, void *priv)
{
      time_t t;

      (void)priv;
      (void)av;
      t = time(NULL);
      cli_out(cli, "PONG %ld", t);
}

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