/* $NetBSD: nlist_aout.c,v 1.10 2018/01/23 21:06:25 sevan Exp $ */

/*-
* Copyright (c) 1990, 1993
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/*-
* Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "from: @(#)nlist.c       8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: nlist_aout.c,v 1.10 2018/01/23 21:06:25 sevan Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>

#include <a.out.h>
#include <db.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "extern.h"

#ifdef NLIST_AOUT

typedef struct nlist NLIST;
#define _strx   n_un.n_strx
#define _name   n_un.n_name

#define badfmt(str)                                                     \
       do {                                                            \
               warnx("%s: %s: %s", kfile, str, strerror(EFTYPE));      \
               punt();                                                 \
       } while (0)

static void     badread(int, char *);
static u_long   get_kerntext(const char *kfn);

static const char *kfile;

int
create_knlist_aout(const char *name, DB *db)
{
       int nsyms;
       struct exec ebuf;
       FILE *fp;
       NLIST nbuf;
       DBT data, key;
       int fd, nr, strsize;
       u_long kerntextoff;
       char *strtab, buf[1024];

       kfile = name;
       if ((fd = open(name, O_RDONLY, 0)) < 0) {
               warn("%s", kfile);
               punt();
       }

       /* Read in exec structure. */
       nr = read(fd, &ebuf, sizeof(struct exec));
       if (nr != sizeof(struct exec)) {
               (void)close(fd);
               return (-1);
       }

       /* Check magic number. */
       if (N_BADMAG(ebuf)) {
               (void)close(fd);
               return (-1);
       }

       /*
        * We've recognized it as an a.out binary.  From here
        * on out, all errors are fatal.
        */

       /* Check symbol count. */
       if (!ebuf.a_syms)
               badfmt("stripped");

       /* Seek to string table. */
       if (lseek(fd, N_STROFF(ebuf), SEEK_SET) == -1)
               badfmt("corrupted string table");

       /* Read in the size of the symbol table. */
       nr = read(fd, (char *)&strsize, sizeof(strsize));
       if (nr != sizeof(strsize))
               badread(nr, "no symbol table");

       /* Read in the string table. */
       strsize -= sizeof(strsize);
       if (!(strtab = malloc(strsize))) {
               warn("malloc");
               punt();
       }
       if ((nr = read(fd, strtab, strsize)) != strsize)
               badread(nr, "corrupted symbol table");

       /* Seek to symbol table. */
       if (!(fp = fdopen(fd, "r"))) {
               warn("%s", name);
               punt();
       }
       if (fseek(fp, N_SYMOFF(ebuf), SEEK_SET) == -1) {
               warn("%s", name);
               punt();
       }

       data.data = (u_char *)&nbuf;
       data.size = sizeof(NLIST);

       kerntextoff = get_kerntext(name);

       /* Read each symbol and enter it into the database. */
       nsyms = ebuf.a_syms / sizeof(struct nlist);
       while (nsyms--) {
               if (fread((char *)&nbuf, sizeof (NLIST), 1, fp) != 1) {
                       if (feof(fp))
                               badfmt("corrupted symbol table");
                       warn("%s", name);
                       punt();
               }
               if (!nbuf._strx || nbuf.n_type&N_STAB)
                       continue;

               key.data = (u_char *)strtab + nbuf._strx - sizeof(long);
               key.size = strlen((char *)key.data);
               if (db->put(db, &key, &data, 0)) {
                       warn("record enter");
                       punt();
               }

               if (strcmp((char *)key.data, VRS_SYM) == 0) {
                       long cur_off, voff;
                       /*
                        * Calculate offset relative to a normal (non-kernel)
                        * a.out.  Kerntextoff is where the kernel is really
                        * loaded; N_TXTADDR is where a normal file is loaded.
                        * From there, locate file offset in text or data.
                        */
                       voff = nbuf.n_value - kerntextoff + N_TXTADDR(ebuf);
                       if ((nbuf.n_type & N_TYPE) == N_TEXT)
                               voff += N_TXTOFF(ebuf) - N_TXTADDR(ebuf);
                       else
                               voff += N_DATOFF(ebuf) - N_DATADDR(ebuf);
                       cur_off = ftell(fp);
                       if (fseek(fp, voff, SEEK_SET) == -1)
                               badfmt("corrupted string table");

                       /*
                        * Read version string up to, and including newline.
                        * This code assumes that a newline terminates the
                        * version line.
                        */
                       if (fgets(buf, sizeof(buf), fp) == NULL)
                               badfmt("corrupted string table");

                       key.data = (u_char *)VRS_KEY;
                       key.size = sizeof(VRS_KEY) - 1;
                       data.data = (u_char *)buf;
                       data.size = strlen(buf);
                       if (db->put(db, &key, &data, 0)) {
                               warn("record enter");
                               punt();
                       }

                       /* Restore to original values. */
                       data.data = (u_char *)&nbuf;
                       data.size = sizeof(NLIST);
                       if (fseek(fp, cur_off, SEEK_SET) == -1)
                               badfmt("corrupted string table");
               }
       }
       (void)fclose(fp);

       return (0);
}

static void
badread(int nr, char *p)
{
       if (nr < 0) {
               warn("%s", kfile);
               punt();
       }
       badfmt(p);
}

/*
* Instead of compiling in KERNTEXTOFF or KERNBASE, try to
* determine the text start address from a standard symbol.
* For backward compatibility, use the old compiled-in way
* when the standard symbol name is not found.
*/
static u_long
get_kerntext(const char *name)
{
       struct nlist nl[2];

       memset((caddr_t)nl, 0, sizeof(nl));
       nl[0].n_un.n_name = "_kernel_text";

       if (nlist(name, nl) != 0) {
               warnx("%s: %s symbol missing",
                   name, nl[0].n_un.n_name);
               punt();
       }

       return (nl[0].n_value);
}
#endif /* NLIST_AOUT */

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.