diff options
Diffstat (limited to 'contrib/bind/lib/inet/inet_cidr_ntop.c')
-rw-r--r-- | contrib/bind/lib/inet/inet_cidr_ntop.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/contrib/bind/lib/inet/inet_cidr_ntop.c b/contrib/bind/lib/inet/inet_cidr_ntop.c new file mode 100644 index 0000000..08352ab --- /dev/null +++ b/contrib/bind/lib/inet/inet_cidr_ntop.c @@ -0,0 +1,129 @@ +/* + * Copyright (c) 1998,1999 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. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static const char rcsid[] = "$Id: inet_cidr_ntop.c,v 8.4 1999/10/07 20:44:02 vixie Exp $"; +#endif + +#include "port_before.h" + +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> + +#include <errno.h> +#include <stdio.h> +#include <string.h> +#include <stdlib.h> + +#include "port_after.h" + +#ifdef SPRINTF_CHAR +# define SPRINTF(x) strlen(sprintf/**/x) +#else +# define SPRINTF(x) ((size_t)sprintf x) +#endif + +static char * inet_cidr_ntop_ipv4 __P((const u_char *src, int bits, + char *dst, size_t size)); + +/* + * char * + * inet_cidr_ntop(af, src, bits, dst, size) + * convert network address from network to presentation format. + * "src"'s size is determined from its "af". + * return: + * pointer to dst, or NULL if an error occurred (check errno). + * note: + * 192.5.5.1/28 has a nonzero host part, which means it isn't a network + * as called for by inet_net_ntop() but it can be a host address with + * an included netmask. + * author: + * Paul Vixie (ISC), October 1998 + */ +char * +inet_cidr_ntop(int af, const void *src, int bits, char *dst, size_t size) { + switch (af) { + case AF_INET: + return (inet_cidr_ntop_ipv4(src, bits, dst, size)); + default: + errno = EAFNOSUPPORT; + return (NULL); + } +} + +/* + * static char * + * inet_cidr_ntop_ipv4(src, bits, dst, size) + * convert IPv4 network address from network to presentation format. + * "src"'s size is determined from its "af". + * return: + * pointer to dst, or NULL if an error occurred (check errno). + * note: + * network byte order assumed. this means 192.5.5.240/28 has + * 0b11110000 in its fourth octet. + * author: + * Paul Vixie (ISC), October 1998 + */ +static char * +inet_cidr_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size) { + char *odst = dst; + char *t; + size_t len = 4; + int b, tb; + + if ((bits < -1) || (bits > 32)) { + errno = EINVAL; + return (NULL); + } + + /* Find number of significant bytes in address. */ + if (bits == -1) + len = 3; + else + for (len = 0,b = 1 ; b < 4; b++) + if (*(src + b)) + len = b; + + /* Format whole octets plus nonzero trailing octets. */ + tb = (bits <= 0) ? 1 : (bits - 1); + for (b = 0; b <= (tb / 8) || (b <= len); b++) { + if (size < sizeof "255.") + goto emsgsize; + t = dst; + dst += SPRINTF((dst, "%u", *src++)); + if (b + 1 <= (tb / 8) || (b + 1 <= len)) { + *dst++ = '.'; + *dst = '\0'; + } + size -= (size_t)(dst - t); + } + + if (bits != -1) { + /* Format CIDR /width. */ + if (size < sizeof "/32") + goto emsgsize; + dst += SPRINTF((dst, "/%u", bits)); + } + + return (odst); + + emsgsize: + errno = EMSGSIZE; + return (NULL); +} |