/*

 * SPDX-License-Identifier: ISC

 *

 * Copyright (c) 2018-2023 Todd C. Miller <Todd.Miller@sudo.ws>

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 */

/*

 * This is an open source non-commercial project. Dear PVS-Studio, please check it.

 * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com

 */

#include <config.h>

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sudoers.h>

/*

 * Set ctx->user.host. ctx->user.shost, ctx->runas.host and ctx->runas.shost

 * based on the local and remote host names.  If host is NULL, the local

 * host name is used.  If remhost is NULL, the same value as host is used.

 */

bool

sudoers_sethost(struct sudoers_context *ctx, const char *host,

    const char *remhost)

{

    char *cp;

    debug_decl(sudoers_sethost, SUDOERS_DEBUG_UTIL);

    if (ctx->user.shost != ctx->user.host)

  free(ctx->user.shost);

    free(ctx->user.host);

    ctx->user.host = NULL;

    ctx->user.shost = NULL;

    if (host == NULL) {

  ctx->user.host = sudo_gethostname();

  if (ctx->user.host == NULL && errno != ENOMEM)

      ctx->user.host = strdup("localhost");

    } else {

  ctx->user.host = strdup(host);

    }

    if (ctx->user.host == NULL)

      goto oom;

    if ((cp = strchr(ctx->user.host, '.')) != NULL) {

  ctx->user.shost = strndup(ctx->user.host,

      (size_t)(cp - ctx->user.host));

  if (ctx->user.shost == NULL)

      goto oom;

    } else {

  ctx->user.shost = ctx->user.host;

    }

    if (ctx->runas.shost != ctx->runas.host)

  free(ctx->runas.shost);

    free(ctx->runas.host);

    ctx->runas.host = NULL;

    ctx->runas.shost = NULL;

    ctx->runas.host = strdup(remhost ? remhost : ctx->user.host);

    if (ctx->runas.host == NULL)

  goto oom;

    if ((cp = strchr(ctx->runas.host, '.')) != NULL) {

  ctx->runas.shost = strndup(ctx->runas.host,

      (size_t)(cp - ctx->runas.host));

  if (ctx->runas.shost == NULL)

      goto oom;

    } else {

  ctx->runas.shost = ctx->runas.host;

    }

    debug_return_bool(true);

oom:

    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));

    debug_return_bool(false);

}