Back to index

glibc  2.9
Defines | Functions | Variables
ns_parse.c File Reference
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <errno.h>
#include <resolv.h>
#include <string.h>

Go to the source code of this file.

Defines

#define RETERR(err)   do { __set_errno (err); return (-1); } while (0)

Functions

static void setsection (ns_msg *msg, ns_sect sect)
int ns_msg_getflag (ns_msg handle, int flag)
int ns_skiprr (const u_char *ptr, const u_char *eom, ns_sect section, int count)
 libresolv_hidden_def (ns_skiprr)
 libresolv_hidden_def (ns_initparse)
 libresolv_hidden_def (ns_parserr)

Variables

static const char rcsid [] = "$BINDId: ns_parse.c,v 8.13 1999/10/13 16:39:35 vixie Exp $"

Detailed Description

Definition in file ns_parse.c.


Define Documentation

#define RETERR (   err)    do { __set_errno (err); return (-1); } while (0)

Definition at line 39 of file ns_parse.c.


Function Documentation

Definition at line 91 of file ns_parse.c.

                                                            {
       const u_char *eom = msg + msglen;
       int i;

       memset(handle, 0x5e, sizeof *handle);
       handle->_msg = msg;
       handle->_eom = eom;
       if (msg + NS_INT16SZ > eom)
              RETERR(EMSGSIZE);
       NS_GET16(handle->_id, msg);
       if (msg + NS_INT16SZ > eom)
              RETERR(EMSGSIZE);
       NS_GET16(handle->_flags, msg);
       for (i = 0; i < ns_s_max; i++) {
              if (msg + NS_INT16SZ > eom)
                     RETERR(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 = ns_skiprr(msg, eom, (ns_sect)i,
                                     handle->_counts[i]);

                     if (b < 0)
                            return (-1);
                     handle->_sections[i] = msg;
                     msg += b;
              }
       if (msg != eom)
              RETERR(EMSGSIZE);
       setsection(handle, ns_s_max);
       return (0);
}

Here is the call graph for this function:

Definition at line 129 of file ns_parse.c.

                                                                  {
       int b;
       int tmp;

       /* Make section right. */
       tmp = section;
       if (tmp < 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 = dn_expand(handle->_msg, handle->_eom,
                    handle->_msg_ptr, rr->name, NS_MAXDNAME);
       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);
}

Here is the call graph for this function:

Definition at line 190 of file ns_parse.c.

                                      {
       msg->_sect = sect;
       if (sect == ns_s_max) {
              msg->_rrnum = -1;
              msg->_msg_ptr = NULL;
       } else {
              msg->_rrnum = 0;
              msg->_msg_ptr = msg->_sections[(int)sect];
       }
}
int ns_msg_getflag ( ns_msg  handle,
int  flag 
)

Definition at line 64 of file ns_parse.c.

                                            {
       return(((handle)._flags & _ns_flagdata[flag].mask) >> _ns_flagdata[flag].shift);
}
int ns_skiprr ( const u_char ptr,
const u_char eom,
ns_sect  section,
int  count 
)

Definition at line 69 of file ns_parse.c.

                                                                            {
       const u_char *optr = ptr;

       for ((void)NULL; count > 0; count--) {
              int b, rdlength;

              b = dn_skipname(ptr, eom);
              if (b < 0)
                     RETERR(EMSGSIZE);
              ptr += b/*Name*/ + NS_INT16SZ/*Type*/ + NS_INT16SZ/*Class*/;
              if (section != ns_s_qd) {
                     if (ptr + NS_INT32SZ + NS_INT16SZ > eom)
                            RETERR(EMSGSIZE);
                     ptr += NS_INT32SZ/*TTL*/;
                     NS_GET16(rdlength, ptr);
                     ptr += rdlength/*RData*/;
              }
       }
       if (ptr > eom)
              RETERR(EMSGSIZE);
       return (ptr - optr);
}

Here is the call graph for this function:

Here is the caller graph for this function:

static void setsection ( ns_msg msg,
ns_sect  sect 
) [static]

Here is the caller graph for this function:


Variable Documentation

const char rcsid[] = "$BINDId: ns_parse.c,v 8.13 1999/10/13 16:39:35 vixie Exp $" [static]

Definition at line 19 of file ns_parse.c.