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freebsd-nq/usr.sbin/kldxref/kldxref.c
Marcelo Araujo 1dcace5ba0 Use NULL instead of 0 for pointers. 
MFC after:	2 weeks.
2016-05-16 01:12:56 +00:00

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/*
* Copyright (c) 2000, Boris Popov
* 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 Boris Popov.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
* $FreeBSD$
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/endian.h>
#include <sys/exec.h>
#include <sys/queue.h>
#include <sys/kernel.h>
#include <sys/reboot.h>
#include <sys/linker.h>
#include <sys/stat.h>
#include <sys/module.h>
#define FREEBSD_ELF
#include <err.h>
#include <fts.h>
#include <string.h>
#include <machine/elf.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include "ef.h"
#define MAXRECSIZE (64 << 10) /* 64k */
#define check(val) if ((error = (val)) != 0) break
static int dflag; /* do not create a hint file, only write on stdout */
static int verbose;
static FILE *fxref; /* current hints file */
static const char *xref_file = "linker.hints";
/*
* A record is stored in the static buffer recbuf before going to disk.
*/
static char recbuf[MAXRECSIZE];
static int recpos; /* current write position */
static int reccnt; /* total record written to this file so far */
static void
intalign(void)
{
recpos = (recpos + sizeof(int) - 1) & ~(sizeof(int) - 1);
}
static void
record_start(void)
{
recpos = 0;
memset(recbuf, 0, MAXRECSIZE);
}
static int
record_end(void)
{
if (recpos == 0)
return 0;
reccnt++;
intalign();
fwrite(&recpos, sizeof(recpos), 1, fxref);
return fwrite(recbuf, recpos, 1, fxref) != 1 ? errno : 0;
}
static int
record_buf(const void *buf, int size)
{
if (MAXRECSIZE - recpos < size)
errx(1, "record buffer overflow");
memcpy(recbuf + recpos, buf, size);
recpos += size;
return 0;
}
/*
* An int is stored in host order and aligned
*/
static int
record_int(int val)
{
intalign();
return record_buf(&val, sizeof(val));
}
/*
* A string is stored as 1-byte length plus data, no padding
*/
static int
record_string(const char *str)
{
int len, error;
u_char val;
if (dflag)
return 0;
val = len = strlen(str);
if (len > 255)
errx(1, "string %s too long", str);
error = record_buf(&val, sizeof(val));
if (error)
return error;
return record_buf(str, len);
}
/* From sys/isa/pnp.c */
static char *
pnp_eisaformat(uint32_t id)
{
uint8_t *data;
static char idbuf[8];
const char hextoascii[] = "0123456789abcdef";
id = htole32(id);
data = (uint8_t *)&id;
idbuf[0] = '@' + ((data[0] & 0x7c) >> 2);
idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5));
idbuf[2] = '@' + (data[1] & 0x1f);
idbuf[3] = hextoascii[(data[2] >> 4)];
idbuf[4] = hextoascii[(data[2] & 0xf)];
idbuf[5] = hextoascii[(data[3] >> 4)];
idbuf[6] = hextoascii[(data[3] & 0xf)];
idbuf[7] = 0;
return(idbuf);
}
struct pnp_elt
{
int pe_kind; /* What kind of entry */
#define TYPE_SZ_MASK 0x0f
#define TYPE_FLAGGED 0x10 /* all f's is a wildcard */
#define TYPE_INT 0x20 /* Is a number */
#define TYPE_PAIRED 0x40
#define TYPE_LE 0x80 /* Matches <= this value */
#define TYPE_GE 0x100 /* Matches >= this value */
#define TYPE_MASK 0x200 /* Specifies a mask to follow */
#define TYPE_U8 (1 | TYPE_INT)
#define TYPE_V8 (1 | TYPE_INT | TYPE_FLAGGED)
#define TYPE_G16 (2 | TYPE_INT | TYPE_GE)
#define TYPE_L16 (2 | TYPE_INT | TYPE_LE)
#define TYPE_M16 (2 | TYPE_INT | TYPE_MASK)
#define TYPE_U16 (2 | TYPE_INT)
#define TYPE_V16 (2 | TYPE_INT | TYPE_FLAGGED)
#define TYPE_U32 (4 | TYPE_INT)
#define TYPE_V32 (4 | TYPE_INT | TYPE_FLAGGED)
#define TYPE_W32 (4 | TYPE_INT | TYPE_PAIRED)
#define TYPE_D 7
#define TYPE_Z 8
#define TYPE_P 9
#define TYPE_E 10
#define TYPE_T 11
int pe_offset; /* Offset within the element */
char * pe_key; /* pnp key name */
TAILQ_ENTRY(pnp_elt) next; /* Link */
};
typedef TAILQ_HEAD(pnp_head, pnp_elt) pnp_list;
/*
* this function finds the data from the pnp table, as described by the
* the description and creates a new output (new_desc). This output table
* is a form that's easier for the agent that's automatically loading the
* modules.
*
* The format output is the simplified string from this routine in the
* same basic format as the pnp string, as documented in sys/module.h.
* First a string describing the format is output, the a count of the
* number of records, then each record. The format string also describes
* the length of each entry (though it isn't a fixed length when strings
* are present).
*
* type Output Meaning
* I uint32_t Integer equality comparison
* J uint32_t Pair of uint16_t fields converted to native
byte order. The two fields both must match.
* G uint32_t Greater than or equal to
* L uint32_t Less than or equal to
* M uint32_t Mask of which fields to test. Fields that
take up space increment the count. This
field must be first, and resets the count.
* D string Description of the device this pnp info is for
* Z string pnp string must match this
* T nothing T fields set pnp values that must be true for
* the entire table.
* Values are packed the same way that other values are packed in this file.
* Strings and int32_t's start on a 32-bit boundary and are padded with 0
* bytes. Objects that are smaller than uint32_t are converted, without
* sign extension to uint32_t to simplify parsing downstream.
*/
static int
parse_pnp_list(const char *desc, char **new_desc, pnp_list *list)
{
const char *walker = desc, *ep = desc + strlen(desc);
const char *colon, *semi;
struct pnp_elt *elt;
char *nd;
char type[8], key[32];
int off;
off = 0;
nd = *new_desc = malloc(strlen(desc) + 1);
if (verbose > 1)
printf("Converting %s into a list\n", desc);
while (walker < ep) {
colon = strchr(walker, ':');
semi = strchr(walker, ';');
if (semi != NULL && semi < colon)
goto err;
if (colon - walker > sizeof(type))
goto err;
strncpy(type, walker, colon - walker);
type[colon - walker] = '\0';
if (semi) {
if (semi - colon >= sizeof(key))
goto err;
strncpy(key, colon + 1, semi - colon - 1);
key[semi - colon - 1] = '\0';
walker = semi + 1;
} else {
if (strlen(colon + 1) >= sizeof(key))
goto err;
strcpy(key, colon + 1);
walker = ep;
}
if (verbose > 1)
printf("Found type %s for name %s\n", type, key);
/* Skip pointer place holders */
if (strcmp(type, "P") == 0) {
off += sizeof(void *);
continue;
}
/*
* Add a node of the appropriate type
*/
elt = malloc(sizeof(struct pnp_elt) + strlen(key) + 1);
TAILQ_INSERT_TAIL(list, elt, next);
elt->pe_key = (char *)(elt + 1);
elt->pe_offset = off;
if (strcmp(type, "U8") == 0)
elt->pe_kind = TYPE_U8;
else if (strcmp(type, "V8") == 0)
elt->pe_kind = TYPE_V8;
else if (strcmp(type, "G16") == 0)
elt->pe_kind = TYPE_G16;
else if (strcmp(type, "L16") == 0)
elt->pe_kind = TYPE_L16;
else if (strcmp(type, "M16") == 0)
elt->pe_kind = TYPE_M16;
else if (strcmp(type, "U16") == 0)
elt->pe_kind = TYPE_U16;
else if (strcmp(type, "V16") == 0)
elt->pe_kind = TYPE_V16;
else if (strcmp(type, "U32") == 0)
elt->pe_kind = TYPE_U32;
else if (strcmp(type, "V32") == 0)
elt->pe_kind = TYPE_V32;
else if (strcmp(type, "W32") == 0)
elt->pe_kind = TYPE_W32;
else if (strcmp(type, "D") == 0) /* description char * */
elt->pe_kind = TYPE_D;
else if (strcmp(type, "Z") == 0) /* char * to match */
elt->pe_kind = TYPE_Z;
else if (strcmp(type, "P") == 0) /* Pointer -- ignored */
elt->pe_kind = TYPE_P;
else if (strcmp(type, "E") == 0) /* EISA PNP ID, as uint32_t */
elt->pe_kind = TYPE_E;
else if (strcmp(type, "T") == 0)
elt->pe_kind = TYPE_T;
else
goto err;
/*
* Maybe the rounding here needs to be more nuanced and/or somehow
* architecture specific. Fortunately, most tables in the system
* have sane ordering of types.
*/
if (elt->pe_kind & TYPE_INT) {
elt->pe_offset = roundup2(elt->pe_offset, elt->pe_kind & TYPE_SZ_MASK);
off = elt->pe_offset + (elt->pe_kind & TYPE_SZ_MASK);
} else if (elt->pe_kind == TYPE_E) {
/* Type E stored as Int, displays as string */
elt->pe_offset = roundup2(elt->pe_offset, sizeof(uint32_t));
off = elt->pe_offset + sizeof(uint32_t);
} else if (elt->pe_kind == TYPE_T) {
/* doesn't actually consume space in the table */
off = elt->pe_offset;
} else {
elt->pe_offset = roundup2(elt->pe_offset, sizeof(void *));
off = elt->pe_offset + sizeof(void *);
}
if (elt->pe_kind & TYPE_PAIRED) {
char *word, *ctx;
for (word = strtok_r(key, "/", &ctx);
word; word = strtok_r(NULL, "/", &ctx)) {
sprintf(nd, "%c:%s;", elt->pe_kind & TYPE_FLAGGED ? 'J' : 'I',
word);
nd += strlen(nd);
}
}
else {
if (elt->pe_kind & TYPE_FLAGGED)
*nd++ = 'J';
else if (elt->pe_kind & TYPE_GE)
*nd++ = 'G';
else if (elt->pe_kind & TYPE_LE)
*nd++ = 'L';
else if (elt->pe_kind & TYPE_MASK)
*nd++ = 'M';
else if (elt->pe_kind & TYPE_INT)
*nd++ = 'I';
else if (elt->pe_kind == TYPE_D)
*nd++ = 'D';
else if (elt->pe_kind == TYPE_Z || elt->pe_kind == TYPE_E)
*nd++ = 'Z';
else if (elt->pe_kind == TYPE_T)
*nd++ = 'T';
else
errx(1, "Impossible type %x\n", elt->pe_kind);
*nd++ = ':';
strcpy(nd, key);
nd += strlen(nd);
*nd++ = ';';
}
}
*nd++ = '\0';
return 0;
err:
errx(1, "Parse error of description string %s", desc);
}
static int
parse_entry(struct mod_metadata *md, const char *cval,
struct elf_file *ef, const char *kldname)
{
struct mod_depend mdp;
struct mod_version mdv;
struct mod_pnp_match_info pnp;
char descr[1024];
Elf_Off data = (Elf_Off)md->md_data;
int error = 0, i, len;
char *walker;
void *table;
record_start();
switch (md->md_type) {
case MDT_DEPEND:
if (!dflag)
break;
check(EF_SEG_READ(ef, data, sizeof(mdp), &mdp));
printf(" depends on %s.%d (%d,%d)\n", cval,
mdp.md_ver_preferred, mdp.md_ver_minimum, mdp.md_ver_maximum);
break;
case MDT_VERSION:
check(EF_SEG_READ(ef, data, sizeof(mdv), &mdv));
if (dflag) {
printf(" interface %s.%d\n", cval, mdv.mv_version);
} else {
record_int(MDT_VERSION);
record_string(cval);
record_int(mdv.mv_version);
record_string(kldname);
}
break;
case MDT_MODULE:
if (dflag) {
printf(" module %s\n", cval);
} else {
record_int(MDT_MODULE);
record_string(cval);
record_string(kldname);
}
break;
case MDT_PNP_INFO:
check(EF_SEG_READ_REL(ef, data, sizeof(pnp), &pnp));
check(EF_SEG_READ(ef, (Elf_Off)pnp.descr, sizeof(descr), descr));
descr[sizeof(descr) - 1] = '\0';
if (dflag) {
printf(" pnp info for bus %s format %s %d entries of %d bytes\n",
cval, descr, pnp.num_entry, pnp.entry_len);
} else {
pnp_list list;
struct pnp_elt *elt, *elt_tmp;
char *new_descr;
if (verbose > 1)
printf(" pnp info for bus %s format %s %d entries of %d bytes\n",
cval, descr, pnp.num_entry, pnp.entry_len);
/*
* Parse descr to weed out the chaff and to create a list
* of offsets to output.
*/
TAILQ_INIT(&list);
parse_pnp_list(descr, &new_descr, &list);
record_int(MDT_PNP_INFO);
record_string(cval);
record_string(new_descr);
record_int(pnp.num_entry);
len = pnp.num_entry * pnp.entry_len;
walker = table = malloc(len);
check(EF_SEG_READ_REL(ef, (Elf_Off)pnp.table, len, table));
/*
* Walk the list and output things. We've collapsed all the
* variant forms of the table down to just ints and strings.
*/
for (i = 0; i < pnp.num_entry; i++) {
TAILQ_FOREACH(elt, &list, next) {
uint8_t v1;
uint16_t v2;
uint32_t v4;
int value;
char buffer[1024];
if (elt->pe_kind == TYPE_W32) {
memcpy(&v4, walker + elt->pe_offset, sizeof(v4));
value = v4 & 0xffff;
record_int(value);
if (verbose > 1)
printf("W32:%#x", value);
value = (v4 >> 16) & 0xffff;
record_int(value);
if (verbose > 1)
printf(":%#x;", value);
} else if (elt->pe_kind & TYPE_INT) {
switch (elt->pe_kind & TYPE_SZ_MASK) {
case 1:
memcpy(&v1, walker + elt->pe_offset, sizeof(v1));
if ((elt->pe_kind & TYPE_FLAGGED) && v1 == 0xff)
value = -1;
else
value = v1;
break;
case 2:
memcpy(&v2, walker + elt->pe_offset, sizeof(v2));
if ((elt->pe_kind & TYPE_FLAGGED) && v2 == 0xffff)
value = -1;
else
value = v2;
break;
case 4:
memcpy(&v4, walker + elt->pe_offset, sizeof(v4));
if ((elt->pe_kind & TYPE_FLAGGED) && v4 == 0xffffffff)
value = -1;
else
value = v4;
break;
default:
errx(1, "Invalid size somehow %#x", elt->pe_kind);
}
if (verbose > 1)
printf("I:%#x;", value);
record_int(value);
} else if (elt->pe_kind == TYPE_T) {
/* Do nothing */
} else { /* E, Z or D -- P already filtered */
if (elt->pe_kind == TYPE_E) {
memcpy(&v4, walker + elt->pe_offset, sizeof(v4));
strcpy(buffer, pnp_eisaformat(v4));
} else {
char *ptr;
ptr = *(char **)(walker + elt->pe_offset);
buffer[0] = '\0';
if (ptr != NULL) {
EF_SEG_READ(ef, (Elf_Off)ptr,
sizeof(buffer), buffer);
buffer[sizeof(buffer) - 1] = '\0';
}
}
if (verbose > 1)
printf("%c:%s;", elt->pe_kind == TYPE_E ? 'E' : (elt->pe_kind == TYPE_Z ? 'Z' : 'D'), buffer);
record_string(buffer);
}
}
if (verbose > 1)
printf("\n");
walker += pnp.entry_len;
}
/* Now free it */
TAILQ_FOREACH_SAFE(elt, &list, next, elt_tmp) {
TAILQ_REMOVE(&list, elt, next);
free(elt);
}
free(table);
}
break;
default:
warnx("unknown metadata record %d in file %s", md->md_type, kldname);
}
if (!error)
record_end();
return error;
}
static int
read_kld(char *filename, char *kldname)
{
struct mod_metadata md;
struct elf_file ef;
void **p, **orgp;
int error, eftype, nmlen;
long start, finish, entries;
char kldmodname[MAXMODNAME + 1], cval[MAXMODNAME + 1], *cp;
if (verbose || dflag)
printf("%s\n", filename);
error = ef_open(filename, &ef, verbose);
if (error) {
error = ef_obj_open(filename, &ef, verbose);
if (error) {
if (verbose)
warnc(error, "elf_open(%s)", filename);
return error;
}
}
eftype = EF_GET_TYPE(&ef);
if (eftype != EFT_KLD && eftype != EFT_KERNEL) {
EF_CLOSE(&ef);
return 0;
}
if (!dflag) {
cp = strrchr(kldname, '.');
nmlen = (cp != NULL) ? cp - kldname : (int)strlen(kldname);
if (nmlen > MAXMODNAME)
nmlen = MAXMODNAME;
strlcpy(kldmodname, kldname, nmlen);
/* fprintf(fxref, "%s:%s:%d\n", kldmodname, kldname, 0);*/
}
do {
check(EF_LOOKUP_SET(&ef, MDT_SETNAME, &start, &finish,
&entries));
check(EF_SEG_READ_ENTRY_REL(&ef, start, sizeof(*p) * entries,
(void *)&p));
orgp = p;
while(entries--) {
check(EF_SEG_READ_REL(&ef, (Elf_Off)*p, sizeof(md),
&md));
p++;
check(EF_SEG_READ(&ef, (Elf_Off)md.md_cval,
sizeof(cval), cval));
cval[MAXMODNAME] = '\0';
parse_entry(&md, cval, &ef, kldname);
}
if (error)
warnc(error, "error while reading %s", filename);
free(orgp);
} while(0);
EF_CLOSE(&ef);
return error;
}
/*
* Create a temp file in directory root, make sure we don't
* overflow the buffer for the destination name
*/
static FILE *
maketempfile(char *dest, const char *root)
{
char *p;
int n, fd;
p = strrchr(root, '/');
n = p != NULL ? p - root + 1 : 0;
if (snprintf(dest, MAXPATHLEN, "%.*slhint.XXXXXX", n, root) >=
MAXPATHLEN) {
errno = ENAMETOOLONG;
return NULL;
}
fd = mkstemp(dest);
if (fd < 0)
return NULL;
fchmod(fd, 0644); /* nothing secret in the file */
return fdopen(fd, "w+");
}
static char xrefname[MAXPATHLEN], tempname[MAXPATHLEN];
static void
usage(void)
{
fprintf(stderr, "%s\n",
"usage: kldxref [-Rdv] [-f hintsfile] path ..."
);
exit(1);
}
static int
compare(const FTSENT *const *a, const FTSENT *const *b)
{
if ((*a)->fts_info == FTS_D && (*b)->fts_info != FTS_D)
return 1;
if ((*a)->fts_info != FTS_D && (*b)->fts_info == FTS_D)
return -1;
return strcmp((*a)->fts_name, (*b)->fts_name);
}
int
main(int argc, char *argv[])
{
FTS *ftsp;
FTSENT *p;
int opt, fts_options, ival;
struct stat sb;
fts_options = FTS_PHYSICAL;
while ((opt = getopt(argc, argv, "Rdf:v")) != -1) {
switch (opt) {
case 'd': /* no hint file, only print on stdout */
dflag = 1;
break;
case 'f': /* use this name instead of linker.hints */
xref_file = optarg;
break;
case 'v':
verbose++;
break;
case 'R': /* recurse on directories */
fts_options |= FTS_COMFOLLOW;
break;
default:
usage();
/* NOTREACHED */
}
}
if (argc - optind < 1)
usage();
argc -= optind;
argv += optind;
if (stat(argv[0], &sb) != 0)
err(1, "%s", argv[0]);
if ((sb.st_mode & S_IFDIR) == 0) {
errno = ENOTDIR;
err(1, "%s", argv[0]);
}
ftsp = fts_open(argv, fts_options, compare);
if (ftsp == NULL)
exit(1);
for (;;) {
p = fts_read(ftsp);
if ((p == NULL || p->fts_info == FTS_D) && fxref) {
/* close and rename the current hint file */
fclose(fxref);
fxref = NULL;
if (reccnt) {
rename(tempname, xrefname);
} else {
/* didn't find any entry, ignore this file */
unlink(tempname);
unlink(xrefname);
}
}
if (p == NULL)
break;
if (p->fts_info == FTS_D && !dflag) {
/* visiting a new directory, create a new hint file */
snprintf(xrefname, sizeof(xrefname), "%s/%s",
ftsp->fts_path, xref_file);
fxref = maketempfile(tempname, ftsp->fts_path);
if (fxref == NULL)
err(1, "can't create %s", tempname);
ival = 1;
fwrite(&ival, sizeof(ival), 1, fxref);
reccnt = 0;
}
/* skip non-files and separate debug files */
if (p->fts_info != FTS_F)
continue;
if (p->fts_namelen >= 6 &&
strcmp(p->fts_name + p->fts_namelen - 6, ".debug") == 0)
continue;
if (p->fts_namelen >= 8 &&
strcmp(p->fts_name + p->fts_namelen - 8, ".symbols") == 0)
continue;
read_kld(p->fts_path, p->fts_name);
}
fts_close(ftsp);
return 0;
}
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