diff options
Diffstat (limited to 'freebsd/lib/libc/nameser/ns_parse.c')
| -rw-r--r-- | freebsd/lib/libc/nameser/ns_parse.c | 70 |
1 files changed, 68 insertions, 2 deletions
diff --git a/freebsd/lib/libc/nameser/ns_parse.c b/freebsd/lib/libc/nameser/ns_parse.c index ad1e7652..80325e7c 100644 --- a/freebsd/lib/libc/nameser/ns_parse.c +++ b/freebsd/lib/libc/nameser/ns_parse.c @@ -18,8 +18,10 @@ */ #ifndef lint -static const char rcsid[] = "$Id: ns_parse.c,v 1.5.18.4 2007/08/27 03:34:24 marka Exp $"; +static const char rcsid[] = "$Id: ns_parse.c,v 1.10 2009/01/23 19:59:16 each Exp $"; #endif +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); /* Import. */ @@ -49,6 +51,9 @@ static void setsection(ns_msg *msg, ns_sect sect); do { errno = (err); if (errno == errno) return (-1); } while (0) #endif +#define PARSE_FMT_PRESO 0 /* Parse using presentation-format names */ +#define PARSE_FMT_WIRE 1 /* Parse using network-format names */ + /* Public. */ /* These need to be in the same order as the nres.h:ns_flag enum. */ @@ -104,7 +109,6 @@ ns_initparse(const u_char *msg, int msglen, ns_msg *handle) { const u_char *eom = msg + msglen; int i; - memset(handle, 0x5e, sizeof *handle); handle->_msg = msg; handle->_eom = eom; if (msg + NS_INT16SZ > eom) @@ -196,6 +200,68 @@ ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) { return (0); } +/* + * This is identical to the above but uses network-format (uncompressed) names. + */ +int +ns_parserr2(ns_msg *handle, ns_sect section, int rrnum, ns_rr2 *rr) { + int b; + int tmp; + + /* Make section right. */ + if ((tmp = section) < 0 || section >= ns_s_max) + RETERR(ENODEV); + if (section != handle->_sect) + setsection(handle, section); + + /* Make rrnum right. */ + if (rrnum == -1) + rrnum = handle->_rrnum; + if (rrnum < 0 || rrnum >= handle->_counts[(int)section]) + RETERR(ENODEV); + if (rrnum < handle->_rrnum) + setsection(handle, section); + if (rrnum > handle->_rrnum) { + b = ns_skiprr(handle->_msg_ptr, handle->_eom, section, + rrnum - handle->_rrnum); + + if (b < 0) + return (-1); + handle->_msg_ptr += b; + handle->_rrnum = rrnum; + } + + /* Do the parse. */ + b = ns_name_unpack2(handle->_msg, handle->_eom, handle->_msg_ptr, + rr->nname, NS_MAXNNAME, &rr->nnamel); + if (b < 0) + return (-1); + handle->_msg_ptr += b; + if (handle->_msg_ptr + NS_INT16SZ + NS_INT16SZ > handle->_eom) + RETERR(EMSGSIZE); + NS_GET16(rr->type, handle->_msg_ptr); + NS_GET16(rr->rr_class, handle->_msg_ptr); + if (section == ns_s_qd) { + rr->ttl = 0; + rr->rdlength = 0; + rr->rdata = NULL; + } else { + if (handle->_msg_ptr + NS_INT32SZ + NS_INT16SZ > handle->_eom) + RETERR(EMSGSIZE); + NS_GET32(rr->ttl, handle->_msg_ptr); + NS_GET16(rr->rdlength, handle->_msg_ptr); + if (handle->_msg_ptr + rr->rdlength > handle->_eom) + RETERR(EMSGSIZE); + rr->rdata = handle->_msg_ptr; + handle->_msg_ptr += rr->rdlength; + } + if (++handle->_rrnum > handle->_counts[(int)section]) + setsection(handle, (ns_sect)((int)section + 1)); + + /* All done. */ + return (0); +} + /* Private. */ static void |