diff options
Diffstat (limited to 'resolv/ns_makecanon.c')
| -rw-r--r-- | resolv/ns_makecanon.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/resolv/ns_makecanon.c b/resolv/ns_makecanon.c new file mode 100644 index 0000000000..a6c3c2737d --- /dev/null +++ b/resolv/ns_makecanon.c @@ -0,0 +1,50 @@ +/* Add missing "." to domain names. + * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") + * Copyright (c) 1995,1999 by Internet Software Consortium. + * + * 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS + * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE + * CONSORTIUM 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. + */ + +#include <arpa/nameser.h> +#include <errno.h> +#include <string.h> + +/* Make a canonical copy of domain name SRC in DST. Behavior: + foo -> foo. + foo. -> foo. + foo.. -> foo. + foo\. -> foo\.. + foo\\. -> foo\\. */ +int +__libc_ns_makecanon (const char *src, char *dst, size_t dstsize) +{ + size_t n = strlen (src); + + if (n + sizeof "." > dstsize) /* sizeof == 2. */ + { + __set_errno (EMSGSIZE); + return -1; + } + strcpy (dst, src); + while (n >= 1U && dst[n - 1] == '.') /* Ends in ".". */ + if (n >= 2U && dst[n - 2] == '\\' && /* Ends in "\.". */ + (n < 3U || dst[n - 3] != '\\')) /* But not "\\.". */ + break; + else + dst[--n] = '\0'; + dst[n++] = '.'; + dst[n] = '\0'; + return 0; +} +libc_hidden_def (__libc_ns_makecanon) |