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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2019, 2022 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sudoers.h>
/*
* Convert struct list_members to a comma-separated string with
* the given variable name. Escapes backslashes and commas.
*/
char *
serialize_list(const char *varname, struct list_members *members)
{
struct list_member *lm, *next;
size_t len, result_size;
char *cp, *result;
debug_decl(serialize_list, SUDOERS_DEBUG_PLUGIN);
result_size = strlen(varname) + 1;
SLIST_FOREACH(lm, members, entries) {
for (cp = lm->value; *cp != '\0'; cp++) {
result_size++;
if (*cp == '\\' || *cp == ',')
result_size++;
}
result_size++;
}
if ((result = malloc(result_size)) == NULL)
goto bad;
/* No need to check len for overflow here. */
len = strlcpy(result, varname, result_size);
result[len++] = '=';
SLIST_FOREACH_SAFE(lm, members, entries, next) {
for (cp = lm->value; *cp != '\0'; cp++) {
bool escape = (*cp == '\\' || *cp == ',');
if (len + 1 + escape >= result_size) {
sudo_warnx(U_("internal error, %s overflow"), __func__);
goto bad;
}
if (escape)
result[len++] = '\\';
result[len++] = *cp;
}
if (next != NULL) {
if (len + 1 >= result_size) {
sudo_warnx(U_("internal error, %s overflow"), __func__);
goto bad;
}
result[len++] = ',';
}
result[len] = '\0';
}
debug_return_str(result);
bad:
free(result);
debug_return_str(NULL);
}
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