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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [libc/] [ns_parse.c] - Rev 278
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/* * Copyright (c) 1996 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(__rtems__) #if !defined(LINT) && !defined(CODECENTER) static char rcsid[] = "$Id: ns_parse.c,v 1.2 2001-09-27 12:01:53 chris Exp $"; #endif /* not lint */ #endif /* not rtems */ #include <sys/types.h> #include <netinet/in.h> #include <arpa/nameser.h> #include <errno.h> #include <resolv.h> #include <string.h> /* These need to be in the same order as the nres.h:ns_flag enum. */ struct _ns_flagdata _ns_flagdata[16] = { { 0x8000, 15 }, /* qr. */ { 0x7800, 11 }, /* opcode. */ { 0x0400, 10 }, /* aa. */ { 0x0200, 9 }, /* tc. */ { 0x0100, 8 }, /* rd. */ { 0x0080, 7 }, /* ra. */ { 0x0040, 6 }, /* z. */ { 0x0020, 5 }, /* ad. */ { 0x0010, 4 }, /* cd. */ { 0x000f, 0 }, /* rcode. */ { 0x0000, 0 }, /* expansion (1/6). */ { 0x0000, 0 }, /* expansion (2/6). */ { 0x0000, 0 }, /* expansion (3/6). */ { 0x0000, 0 }, /* expansion (4/6). */ { 0x0000, 0 }, /* expansion (5/6). */ { 0x0000, 0 }, /* expansion (6/6). */ }; static int skiprr(const u_char *ptr, const u_char *eom, ns_sect section, int count) { const u_char *optr = ptr; for ((void)NULL; count > 0; count--) { int b, rdlength; b = dn_skipname(ptr, eom); if (b < 0) goto emsgsize; ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/; if (section != ns_s_qd) { if (ptr + NS_INT32SZ > eom) goto emsgsize; ptr += NS_INT32SZ/*TTL*/; if (ptr + NS_INT16SZ > eom) goto emsgsize; NS_GET16(rdlength, ptr); ptr += rdlength/*RData*/; } } if (ptr > eom) goto emsgsize; return (ptr - optr); emsgsize: errno = EMSGSIZE; return (-1); } int 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) goto emsgsize; NS_GET16(handle->_id, msg); if (msg + NS_INT16SZ > eom) goto emsgsize; NS_GET16(handle->_flags, msg); for (i = 0; i < ns_s_max; i++) { if (msg + NS_INT16SZ > eom) goto emsgsize; NS_GET16(handle->_counts[i], msg); } for (i = 0; i < ns_s_max; i++) if (handle->_counts[i] == 0) handle->_sections[i] = NULL; else { int b = skiprr(msg, eom, (ns_sect)i, handle->_counts[i]); if (b < 0) return (-1); handle->_sections[i] = msg; msg += b; } if (msg != eom) goto emsgsize; handle->_sect = ns_s_max; handle->_rrnum = -1; handle->_ptr = NULL; return (0); emsgsize: errno = EMSGSIZE; return (-1); } int ns_parserr(ns_msg *handle, ns_sect section, int rrnum, ns_rr *rr) { int b; /* Make section right. */ if (section < 0 || section >= ns_s_max) goto enodev; if ((int)section != (int)handle->_sect) { handle->_sect = section; handle->_rrnum = 0; handle->_ptr = handle->_sections[(int)section]; } /* Make rrnum right. */ if (rrnum == -1) rrnum = handle->_rrnum; if (rrnum < 0 || rrnum >= handle->_counts[(int)section]) goto enodev; if (rrnum < handle->_rrnum) { handle->_rrnum = 0; handle->_ptr = handle->_sections[(int)section]; } b = skiprr(handle->_msg, handle->_eom, section, rrnum - handle->_rrnum); if (b < 0) return (-1); handle->_ptr += b; handle->_rrnum = rrnum; /* Do the parse. */ b = dn_expand(handle->_msg, handle->_eom, handle->_ptr, rr->name, NS_MAXDNAME); if (b < 0) return (-1); handle->_ptr += b; if (handle->_ptr + NS_INT16SZ > handle->_eom) goto emsgsize; NS_GET16(rr->type, handle->_ptr); if (handle->_ptr + NS_INT16SZ > handle->_eom) goto emsgsize; NS_GET16(rr->class, handle->_ptr); if (section == ns_s_qd) { rr->ttl = 0; rr->rdlength = 0; rr->rdata = NULL; } else { if (handle->_ptr + NS_INT32SZ > handle->_eom) goto emsgsize; NS_GET32(rr->ttl, handle->_ptr); if (handle->_ptr + NS_INT16SZ > handle->_eom) goto emsgsize; NS_GET16(rr->rdlength, handle->_ptr); if (handle->_ptr + rr->rdlength > handle->_eom) goto emsgsize; rr->rdata = handle->_ptr; handle->_ptr += rr->rdlength; } handle->_rrnum++; /* All done. */ return (0); enodev: errno = ENODEV; return (-1); emsgsize: errno = EMSGSIZE; return (-1); }
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