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/*-
* Copyright (c) 2002, 2003 Greg Lehey
* 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.
*
* This software is provided by the author ``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 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.
*/
/* $Id: asf.c,v 1.4 2003/05/04 02:55:20 grog Exp grog $ */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fts.h>
#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "asf.h"
struct kfile {
char *name;
caddr_t addr;
int seen;
STAILQ_ENTRY(kfile) link;
};
static STAILQ_HEAD(,kfile) kfile_head = STAILQ_HEAD_INITIALIZER(kfile_head);
void
kfile_add(const char *name, caddr_t addr)
{
struct kfile *kfp;
if ((kfp = malloc(sizeof(*kfp))) == NULL ||
(kfp->name = strdup(name)) == NULL)
errx(2, "out of memory");
kfp->addr = addr;
kfp->seen = 0;
STAILQ_INSERT_TAIL(&kfile_head, kfp, link);
}
static struct kfile *
kfile_find(const char *name)
{
struct kfile *kfp;
STAILQ_FOREACH(kfp, &kfile_head, link)
if (strcmp(kfp->name, name) == 0)
return (kfp); /* found */
return (NULL); /* not found */
}
static int
kfile_allseen(void)
{
struct kfile *kfp;
STAILQ_FOREACH(kfp, &kfile_head, link)
if (!kfp->seen)
return (0); /* at least one unseen */
return (1); /* all seen */
}
static int
kfile_empty(void)
{
return (STAILQ_EMPTY(&kfile_head));
}
/*
* Take a blank separated list of tokens and turn it into a list of
* individual nul-delimited strings. Build a list of pointers at
* token, which must have enough space for the tokens. Return the
* number of tokens, or -1 on error (typically a missing string
* delimiter).
*/
int
tokenize(char *cptr, char *token[], int maxtoken)
{
char delim; /* delimiter to search for */
int tokennr; /* index of this token */
for (tokennr = 0; tokennr < maxtoken;) {
while (isspace(*cptr))
cptr++; /* skip initial white space */
if ((*cptr == '\0') || (*cptr == '\n')
|| (*cptr == '#')) /* end of line */
return tokennr; /* return number of tokens found */
delim = *cptr;
token[tokennr] = cptr; /* point to it */
tokennr++; /* one more */
if (tokennr == maxtoken) /* run off the end? */
return tokennr;
if ((delim == '\'') || (delim == '"')) { /* delimitered */
for (;;) {
cptr++;
if ((*cptr == delim)
&& (cptr[-1] != '\\')) { /* found the partner */
cptr++; /* move on past */
if (!isspace(*cptr)) /* no space after closing quote */
return -1;
*cptr++ = '\0'; /* delimit */
} else if ((*cptr == '\0')
|| (*cptr == '\n')) /* end of line */
return -1;
}
} else { /* not quoted */
while ((*cptr != '\0') && (!isspace(*cptr)) && (*cptr != '\n'))
cptr++;
if (*cptr != '\0') /* not end of the line, */
*cptr++ = '\0'; /* delimit and move to the next */
}
}
return maxtoken; /* can't get here */
}
static void
doobj(const char *path, caddr_t addr, FILE *out)
{
uintmax_t base = (uintptr_t)addr;
uintmax_t textaddr = 0;
uintmax_t dataaddr = 0;
uintmax_t bssaddr = 0;
uintmax_t *up;
int octokens;
char *octoken[MAXTOKEN];
char ocbuf[LINE_MAX + PATH_MAX];
FILE *objcopy;
snprintf(ocbuf, sizeof(ocbuf),
"/usr/bin/objdump --section-headers %s", path);
if ((objcopy = popen(ocbuf, "r")) == NULL)
err(2, "can't start %s", ocbuf);
while (fgets(ocbuf, sizeof(ocbuf), objcopy)) {
octokens = tokenize(ocbuf, octoken, MAXTOKEN);
if (octokens <= 1)
continue;
up = NULL;
if (strcmp(octoken[1], ".text") == 0)
up = &textaddr;
else if (strcmp(octoken[1], ".data") == 0)
up = &dataaddr;
else if (strcmp(octoken[1], ".bss") == 0)
up = &bssaddr;
if (up == NULL)
continue;
*up = strtoumax(octoken[3], NULL, 16) + base;
}
if (textaddr) { /* we must have a text address */
fprintf(out, "add-symbol-file %s 0x%jx", path, textaddr);
if (dataaddr)
fprintf(out, " -s .data 0x%jx", dataaddr);
if (bssaddr)
fprintf(out, " -s .bss 0x%jx", bssaddr);
fprintf(out, "\n");
}
}
static void
findmodules(const char *modules_path, const char *sfx[], FILE *out)
{
char *path_argv[2];
char *p;
FTS *fts;
FTSENT *ftsent;
struct kfile *kfp;
int i;
int sl;
/* Have to copy modules_path here because it's const */
if ((path_argv[0] = strdup(modules_path)) == NULL)
errx(2, "out of memory");
path_argv[1] = NULL;
/* Have to fts once per suffix to find preferred suffixes first */
do {
sl = *sfx ? strlen(*sfx) : 0; /* current suffix length */
fts = fts_open(path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
if (fts == NULL)
err(2, "can't begin traversing path %s", modules_path);
while ((ftsent = fts_read(fts)) != NULL) {
if (ftsent->fts_info == FTS_DNR ||
ftsent->fts_info == FTS_ERR ||
ftsent->fts_info == FTS_NS) {
errno = ftsent->fts_errno;
err(2, "error while traversing path %s", ftsent->fts_path);
}
if (ftsent->fts_info != FTS_F)
continue; /* not a plain file */
if (sl > 0) {
/* non-blank suffix; see if file name has it */
i = ftsent->fts_namelen - sl;
if (i <= 0 || strcmp(ftsent->fts_name + i, *sfx) != 0)
continue; /* no such suffix */
if ((p = strdup(ftsent->fts_name)) == NULL)
errx(2, "out of memory");
p[i] = '\0'; /* remove suffix in the copy */
kfp = kfile_find(p);
free(p);
} else
kfp = kfile_find(ftsent->fts_name);
if (kfp && !kfp->seen) {
doobj(ftsent->fts_path, kfp->addr, out);
kfp->seen = 1;
/* Optimization: stop fts as soon as seen all loaded modules */
if (kfile_allseen()) {
fts_close(fts);
goto done;
}
}
}
if (ftsent == NULL && errno != 0)
err(2, "couldn't complete traversing path %s", modules_path);
fts_close(fts);
} while (*sfx++);
done:
free(path_argv[0]);
}
static void
usage(const char *myname)
{
fprintf(stderr,
"Usage:\n"
"%s [-afKksVx] [-M core] [-N system ] [-o outfile] [-X suffix]\n"
"%*s [modules-path [outfile]]\n\n"
"\t-a\tappend to outfile\n"
"\t-f\tfind the module in any subdirectory of modules-path\n"
"\t-K\tuse kld(2) to get the list of modules\n"
"\t-k\ttake input from kldstat(8)\n"
"\t-M\tspecify core name for kvm(3)\n"
"\t-N\tspecify system name for kvm(3)\n"
"\t-o\tuse outfile instead of \".asf\"\n"
"\t-s\tdon't prepend subdir for module path\n"
"\t-V\tuse kvm(3) to get the list of modules\n"
"\t-X\tappend suffix to list of possible module file name suffixes\n"
"\t-x\tclear list of possible module file name suffixes\n",
myname, strlen(myname), "");
exit(2);
}
#define MAXSUFFIXES 15
/* KLD file names end in this */
static int nsuffixes = 2;
static const char *suffixes[MAXSUFFIXES + 1] = {
".debug",
".symbols",
NULL
};
int
main(int argc, char *argv[])
{
char basename[PATH_MAX];
char path[PATH_MAX];
const char *filemode = "w"; /* mode for outfile */
const char *modules_path = "modules"; /* path to kernel build directory */
const char *outfile = ".asf"; /* and where to write the output */
const char *corefile = NULL; /* for kvm(3) */
const char *sysfile = NULL; /* for kvm(3) */
const char **sfx;
struct kfile *kfp;
struct stat st;
FILE *out; /* output file */
int dofind = 0;
int dokld = 0;
int dokvm = 0;
int nosubdir = 0;
int runprog = 0;
int i;
const int sl = strlen(KLDSUFFIX);
while ((i = getopt(argc, argv, "afKkM:N:o:sVX:x")) != -1)
switch (i) {
case 'a':
filemode = "a"; /* append to outfile */
break;
case 'f':
dofind = 1; /* find .ko (recursively) */
break;
case 'K':
dokld = 1; /* use kld(2) interface */
break;
case 'k':
runprog = 1; /* get input from kldstat(8) */
break;
case 'M':
corefile = optarg; /* core file for kvm(3) */
break;
case 'N':
sysfile = optarg; /* system file (kernel) for kvm(3) */
break;
case 'o':
outfile = optarg; /* output file name */
break;
case 's':
nosubdir = 1; /* don't descend into subdirs */
break;
case 'V':
dokvm = 1; /* use kvm(3) interface */
break;
case 'X':
if (nsuffixes >= MAXSUFFIXES)
errx(2, "only %d suffixes can be specified", MAXSUFFIXES);
suffixes[nsuffixes++] = optarg;
suffixes[nsuffixes] = NULL;
break;
case 'x':
nsuffixes = 0;
suffixes[0] = NULL;
break;
default:
usage(argv[0]);
}
argc -= optind;
argv += optind;
if (argc > 0) {
modules_path = argv[0];
argc--, argv++;
}
if (argc > 0) {
outfile = argv[0];
argc--, argv++;
}
if (argc > 0)
usage(argv[0]);
if (strcmp(outfile, "-") == 0)
out = stdout;
else
if ((out = fopen(outfile, filemode)) == NULL)
err(2, "can't open output file %s", outfile);
if (dokvm || corefile || sysfile) {
if (dokld || runprog)
warnx("using kvm(3) instead");
asf_kvm(sysfile, corefile);
} else if (dokld) {
if (runprog)
warnx("using kld(2) instead");
asf_kld();
} else
asf_prog(runprog);
/* Avoid long operations like module tree traversal when nothing to do */
if (kfile_empty()) {
warnx("no kernel modules loaded");
return (0);
}
if (!dofind)
STAILQ_FOREACH(kfp, &kfile_head, link) {
if (!nosubdir) {
/* prepare basename of KLD, w/o suffix */
strlcpy(basename, kfp->name, sizeof(basename) - 1);
i = strlen(basename);
if (i > sl && strcmp(basename + i - sl, KLDSUFFIX) == 0)
i -= sl;
basename[i] = '/';
basename[i + 1] = '\0';
}
for (sfx = suffixes;; sfx++) {
snprintf(path, sizeof(path),
"%s/%s%s%s",
modules_path,
nosubdir ? "" : basename,
kfp->name,
*sfx ? *sfx : "");
if (*sfx == NULL || stat(path, &st) == 0) {
doobj(path, kfp->addr, out);
break;
}
}
}
else
findmodules(modules_path, suffixes, out);
return (0);
}
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