diff options
Diffstat (limited to 'third_party/nss_wrapper/nss_utils.c')
| -rw-r--r-- | third_party/nss_wrapper/nss_utils.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/third_party/nss_wrapper/nss_utils.c b/third_party/nss_wrapper/nss_utils.c new file mode 100644 index 0000000..1d0a3d0 --- /dev/null +++ b/third_party/nss_wrapper/nss_utils.c @@ -0,0 +1,131 @@ +/* + * BSD 3-Clause License + * + * Copyright (c) 2007, Stefan Metzmacher <metze@samba.org> + * Copyright (c) 2009, Guenther Deschner <gd@samba.org> + * Copyright (c) 2014-2015, Michael Adam <obnox@samba.org> + * Copyright (c) 2015, Robin Hack <hack.robin@gmail.com> + * Copyright (c) 2013-2018, Andreas Schneider <asn@samba.org> + * All rights reserved. + * + * 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. + * + * 3. Neither the name of the author nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE 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 THE 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. + */ + +#include <errno.h> +#include <grp.h> +#include <string.h> +#include <stdint.h> + +#include "nss_utils.h" + +int nwrap_gr_copy_r(const struct group *src, struct group *dst, + char *buf, size_t buflen, struct group **dstp) +{ + char *p = NULL; + uintptr_t align = 0; + unsigned int gr_mem_cnt = 0; + unsigned i; + size_t total_len; + size_t gr_name_len = strlen(src->gr_name) + 1; + size_t gr_passwd_len = strlen(src->gr_passwd) + 1; + union { + char *ptr; + char **data; + } g_mem; + + for (i = 0; src->gr_mem[i] != NULL; i++) { + gr_mem_cnt++; + } + + /* Align the memory for storing pointers */ + align = __alignof__(char *) - ((p - (char *)0) % __alignof__(char *)); + total_len = align + + (1 + gr_mem_cnt) * sizeof(char *) + + gr_name_len + gr_passwd_len; + + if (total_len > buflen) { + errno = ERANGE; + return -1; + } + buflen -= total_len; + + /* gr_mem */ + p = buf + align; + g_mem.ptr = p; + dst->gr_mem = g_mem.data; + + /* gr_name */ + p += (1 + gr_mem_cnt) * sizeof(char *); + dst->gr_name = p; + + /* gr_passwd */ + p += gr_name_len; + dst->gr_passwd = p; + + /* gr_mem[x] */ + p += gr_passwd_len; + + /* gr_gid */ + dst->gr_gid = src->gr_gid; + + memcpy(dst->gr_name, src->gr_name, gr_name_len); + + memcpy(dst->gr_passwd, src->gr_passwd, gr_passwd_len); + + /* Set the terminating entry */ + dst->gr_mem[gr_mem_cnt] = NULL; + + /* Now add the group members content */ + total_len = 0; + for (i = 0; i < gr_mem_cnt; i++) { + size_t len = strlen(src->gr_mem[i]) + 1; + + dst->gr_mem[i] = p; + total_len += len; + p += len; + } + + if (total_len > buflen) { + errno = ERANGE; + return -1; + } + + for (i = 0; i < gr_mem_cnt; i++) { + size_t len = strlen(src->gr_mem[i]) + 1; + + memcpy(dst->gr_mem[i], + src->gr_mem[i], + len); + } + + if (dstp != NULL) { + *dstp = dst; + } + + return 0; +} |