mirror of https://github.com/sudo-project/sudo.git
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2019, 2022 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sudoers.h>
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/*
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* Convert struct list_members to a comma-separated string with
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* the given variable name. Escapes backslashes and commas.
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*/
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char *
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serialize_list(const char *varname, struct list_members *members)
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{
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struct list_member *lm, *next;
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size_t len, result_size;
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char *cp, *result;
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debug_decl(serialize_list, SUDOERS_DEBUG_PLUGIN);
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result_size = strlen(varname) + 1;
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SLIST_FOREACH(lm, members, entries) {
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for (cp = lm->value; *cp != '\0'; cp++) {
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result_size++;
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if (*cp == '\\' || *cp == ',')
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result_size++;
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}
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result_size++;
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}
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if ((result = malloc(result_size)) == NULL)
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goto bad;
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/* No need to check len for overflow here. */
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len = strlcpy(result, varname, result_size);
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result[len++] = '=';
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SLIST_FOREACH_SAFE(lm, members, entries, next) {
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for (cp = lm->value; *cp != '\0'; cp++) {
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bool escape = (*cp == '\\' || *cp == ',');
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if (len + 1 + escape >= result_size) {
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sudo_warnx(U_("internal error, %s overflow"), __func__);
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goto bad;
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}
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if (escape)
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result[len++] = '\\';
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result[len++] = *cp;
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}
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if (next != NULL) {
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if (len + 1 >= result_size) {
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sudo_warnx(U_("internal error, %s overflow"), __func__);
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goto bad;
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}
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result[len++] = ',';
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}
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result[len] = '\0';
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}
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debug_return_str(result);
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bad:
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free(result);
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debug_return_str(NULL);
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}
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