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filesys.c
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/* filesys.c - core analysis suite
*
* Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
* Copyright (C) 2002-2019 David Anderson
* Copyright (C) 2002-2019 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "defs.h"
#include <sys/sysmacros.h>
#include <linux/major.h>
#include <regex.h>
#include <sys/utsname.h>
static void show_mounts(ulong, int, struct task_context *);
static int find_booted_kernel(void);
static int find_booted_system_map(void);
static int verify_utsname(char *);
static char **build_searchdirs(int, int *);
static int build_kernel_directory(char *);
static int redhat_kernel_directory_v1(char *);
static int redhat_kernel_directory_v2(char *);
static int redhat_debug_directory(char *);
static ulong *create_dentry_array(ulong, int *);
static ulong *create_dentry_array_percpu(ulong, int *);
static void show_fuser(char *, char *);
static int mount_point(char *);
static int open_file_reference(struct reference *);
static void memory_source_init(void);
static int get_pathname_component(ulong, ulong, int, char *, char *);
char *inode_type(char *, char *);
static void match_proc_version(void);
static void get_live_memory_source(void);
static int memory_driver_module_loaded(int *);
static int insmod_memory_driver_module(void);
static int get_memory_driver_dev(dev_t *);
static int memory_driver_init(void);
static int create_memory_device(dev_t);
static int match_file_string(char *, char *, char *);
static ulong get_root_vfsmount(char *);
static void check_live_arch_mismatch(void);
static long get_inode_nrpages(ulong);
static void dump_inode_page_cache_info(ulong);
#define DENTRY_CACHE (20)
#define INODE_CACHE (20)
#define FILE_CACHE (20)
static struct filesys_table {
char *dentry_cache;
ulong cached_dentry[DENTRY_CACHE];
ulong cached_dentry_hits[DENTRY_CACHE];
int dentry_cache_index;
ulong dentry_cache_fills;
char *inode_cache;
ulong cached_inode[INODE_CACHE];
ulong cached_inode_hits[INODE_CACHE];
int inode_cache_index;
ulong inode_cache_fills;
char *file_cache;
ulong cached_file[FILE_CACHE];
ulong cached_file_hits[FILE_CACHE];
int file_cache_index;
ulong file_cache_fills;
} filesys_table = { 0 };
static struct filesys_table *ft = &filesys_table;
/*
* Open the namelist, dumpfile and output devices.
*/
void
fd_init(void)
{
pc->nfd = pc->kfd = pc->mfd = pc->dfd = -1;
if ((pc->nullfp = fopen("/dev/null", "w+")) == NULL)
error(INFO, "cannot open /dev/null (for extraneous output)");
if (REMOTE())
remote_fd_init();
else {
if (pc->namelist && pc->namelist_debug && pc->system_map) {
error(INFO,
"too many namelist options:\n %s\n %s\n %s\n",
pc->namelist, pc->namelist_debug,
pc->system_map);
program_usage(SHORT_FORM);
}
if (pc->namelist) {
if (XEN_HYPER_MODE() && !pc->dumpfile)
error(FATAL,
"Xen hypervisor mode requires a dumpfile\n");
if (!pc->dumpfile && !get_proc_version())
error(INFO, "/proc/version: %s\n",
strerror(errno));
} else {
if (pc->dumpfile) {
error(INFO, "namelist argument required\n");
program_usage(SHORT_FORM);
}
if (!pc->dumpfile)
check_live_arch_mismatch();
if (!find_booted_kernel())
program_usage(SHORT_FORM);
}
if (!pc->dumpfile) {
pc->flags |= LIVE_SYSTEM;
get_live_memory_source();
}
if ((pc->nfd = open(pc->namelist, O_RDONLY)) < 0)
error(FATAL, "%s: %s\n", pc->namelist, strerror(errno));
else {
close(pc->nfd);
pc->nfd = -1;
}
if (LOCAL_ACTIVE() && !(pc->namelist_debug || pc->system_map)) {
memory_source_init();
match_proc_version();
}
}
memory_source_init();
if (ACTIVE())
proc_kcore_init(fp, UNUSED);
if (CRASHDEBUG(1)) {
fprintf(fp, "readmem: %s() ", readmem_function_name());
if (ACTIVE()) {
fprintf(fp, "-> %s ", pc->live_memsrc);
if (pc->flags & MEMMOD)
fprintf(fp, "(module)");
else if (pc->flags & CRASHBUILTIN)
fprintf(fp, "(built-in)");
}
fprintf(fp, "\n");
}
}
/*
* Do whatever's necessary to handle the memory source.
*/
static void
memory_source_init(void)
{
if (REMOTE() && !(pc->flags2 & MEMSRC_LOCAL))
return;
if (pc->flags & KERNEL_DEBUG_QUERY)
return;
if (LOCAL_ACTIVE()) {
if (pc->mfd != -1) /* already been here */
return;
if (!STREQ(pc->live_memsrc, "/dev/mem") &&
STREQ(pc->live_memsrc, pc->memory_device)) {
if (memory_driver_init())
return;
error(INFO, "cannot initialize crash memory driver\n");
error(INFO, "using /dev/mem\n\n");
pc->flags &= ~MEMMOD;
pc->flags |= DEVMEM;
pc->readmem = read_dev_mem;
pc->writemem = write_dev_mem;
pc->live_memsrc = "/dev/mem";
}
if (STREQ(pc->live_memsrc, "/dev/mem")) {
if ((pc->mfd = open("/dev/mem", O_RDWR)) < 0) {
if ((pc->mfd = open("/dev/mem", O_RDONLY)) < 0)
error(FATAL, "/dev/mem: %s\n",
strerror(errno));
} else
pc->flags |= MFD_RDWR;
} else if (STREQ(pc->live_memsrc, "/proc/kcore")) {
if ((pc->mfd = open("/proc/kcore", O_RDONLY)) < 0)
error(FATAL, "/proc/kcore: %s\n",
strerror(errno));
if (!proc_kcore_init(fp, pc->mfd))
error(FATAL,
"/proc/kcore: initialization failed\n");
} else {
if (!pc->live_memsrc)
error(FATAL, "cannot find a live memory device\n");
else
error(FATAL, "unknown memory device: %s\n",
pc->live_memsrc);
}
return;
}
if (pc->dumpfile) {
if (!file_exists(pc->dumpfile, NULL))
error(FATAL, "%s: %s\n", pc->dumpfile,
strerror(ENOENT));
if (!(pc->flags & DUMPFILE_TYPES))
error(FATAL, "%s: dump format not supported!\n",
pc->dumpfile);
if (pc->flags & NETDUMP) {
if (!netdump_init(pc->dumpfile, fp))
error(FATAL, "%s: initialization failed\n",
pc->dumpfile);
} else if (pc->flags & KDUMP) {
if (!kdump_init(pc->dumpfile, fp))
error(FATAL, "%s: initialization failed\n",
pc->dumpfile);
} else if (pc->flags & XENDUMP) {
if (!xendump_init(pc->dumpfile, fp))
error(FATAL, "%s: initialization failed\n",
pc->dumpfile);
} else if (pc->flags & KVMDUMP) {
if (!kvmdump_init(pc->dumpfile, fp))
error(FATAL, "%s: initialization failed\n",
pc->dumpfile);
} else if (pc->flags & DISKDUMP) {
if (!diskdump_init(pc->dumpfile, fp))
error(FATAL, "%s: initialization failed\n",
pc->dumpfile);
} else if (pc->flags & LKCD) {
if ((pc->dfd = open(pc->dumpfile, O_RDONLY)) < 0)
error(FATAL, "%s: %s\n", pc->dumpfile,
strerror(errno));
if (!lkcd_dump_init(fp, pc->dfd, pc->dumpfile))
error(FATAL, "%s: initialization failed\n",
pc->dumpfile);
} else if (pc->flags & S390D) {
if (!s390_dump_init(pc->dumpfile))
error(FATAL, "%s: initialization failed\n",
pc->dumpfile);
} else if (pc->flags & VMWARE_VMSS) {
if (!vmware_vmss_init(pc->dumpfile, fp))
error(FATAL, "%s: initialization failed\n",
pc->dumpfile);
}
}
}
/*
* If only a namelist argument is entered for a live system, and the
* version string doesn't match /proc/version, try to avert a failure
* by assigning it to a matching System.map.
*/
static void
match_proc_version(void)
{
char buffer[BUFSIZE], *p1, *p2;
if (pc->flags & KERNEL_DEBUG_QUERY)
return;
if (!strlen(kt->proc_version))
return;
if (match_file_string(pc->namelist, kt->proc_version, buffer)) {
if (CRASHDEBUG(1)) {
fprintf(fp, "/proc/version:\n%s\n", kt->proc_version);
fprintf(fp, "%s:\n%s", pc->namelist, buffer);
}
return;
}
error(WARNING, "%s%sand /proc/version do not match!\n\n",
pc->namelist,
strlen(pc->namelist) > 39 ? "\n " : " ");
/*
* find_booted_system_map() requires VTOP(), which used to be a
* hardwired masking of the kernel address. But some architectures
* may not know what their physical base address is at this point,
* and others may have different machdep->kvbase values, so for all
* but the 0-based kernel virtual address architectures, bail out
* here with a relevant error message.
*/
if (!machine_type("S390") && !machine_type("S390X")) {
p1 = &kt->proc_version[strlen("Linux version ")];
p2 = strstr(p1, " ");
*p2 = NULLCHAR;
error(WARNING, "/proc/version indicates kernel version: %s\n", p1);
error(FATAL, "please use the vmlinux file for that kernel version, or try using\n"
" the System.map for that kernel version as an additional argument.\n", p1);
clean_exit(1);
}
if (find_booted_system_map())
pc->flags |= SYSMAP;
}
#define CREATE 1
#define DESTROY 0
#define DEFAULT_SEARCHDIRS 5
#define EXTRA_SEARCHDIRS 5
static char **
build_searchdirs(int create, int *preferred)
{
int i;
int cnt, start;
DIR *dirp;
struct dirent *dp;
char dirbuf[BUFSIZE];
static char **searchdirs = { 0 };
static char *default_searchdirs[DEFAULT_SEARCHDIRS+1] = {
"/usr/src/linux/",
"/boot/",
"/boot/efi/redhat",
"/boot/efi/EFI/redhat",
"/",
NULL
};
if (!create) {
if (searchdirs) {
for (i = DEFAULT_SEARCHDIRS; searchdirs[i]; i++)
free(searchdirs[i]);
free(searchdirs);
}
return NULL;
}
if (preferred)
*preferred = 0;
/*
* Allow, at a minimum, the defaults plus an extra four directories:
*
* /lib/modules
* /usr/src/redhat/BUILD/kernel-<version>/linux
* /usr/src/redhat/BUILD/kernel-<version>/linux-<version>
* /usr/lib/debug/lib/modules
*
*/
cnt = DEFAULT_SEARCHDIRS + EXTRA_SEARCHDIRS;
if ((dirp = opendir("/usr/src"))) {
for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp))
cnt++;
if ((searchdirs = calloc(cnt, sizeof(char *))) == NULL) {
error(INFO, "/usr/src/ directory list malloc: %s\n",
strerror(errno));
closedir(dirp);
return default_searchdirs;
}
for (i = 0; i < DEFAULT_SEARCHDIRS; i++)
searchdirs[i] = default_searchdirs[i];
cnt = DEFAULT_SEARCHDIRS;
rewinddir(dirp);
for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)) {
if (STREQ(dp->d_name, "linux") ||
STREQ(dp->d_name, "redhat") ||
STREQ(dp->d_name, ".") ||
STREQ(dp->d_name, ".."))
continue;
sprintf(dirbuf, "/usr/src/%s", dp->d_name);
if (mount_point(dirbuf))
continue;
if (!is_directory(dirbuf))
continue;
if ((searchdirs[cnt] = (char *)
malloc(strlen(dirbuf)+2)) == NULL) {
error(INFO,
"/usr/src/ directory entry malloc: %s\n",
strerror(errno));
break;
}
sprintf(searchdirs[cnt], "%s/", dirbuf);
cnt++;
}
closedir(dirp);
searchdirs[cnt] = NULL;
} else {
if ((searchdirs = calloc(cnt, sizeof(char *))) == NULL) {
error(INFO, "search directory list malloc: %s\n",
strerror(errno));
return default_searchdirs;
}
for (i = 0; i < DEFAULT_SEARCHDIRS; i++)
searchdirs[i] = default_searchdirs[i];
cnt = DEFAULT_SEARCHDIRS;
}
if (build_kernel_directory(dirbuf)) {
if ((searchdirs[cnt] = (char *)
malloc(strlen(dirbuf)+2)) == NULL) {
error(INFO,
"/lib/modules/ directory entry malloc: %s\n",
strerror(errno));
} else {
sprintf(searchdirs[cnt], "%s/", dirbuf);
cnt++;
}
}
if (redhat_kernel_directory_v1(dirbuf)) {
if ((searchdirs[cnt] = (char *)
malloc(strlen(dirbuf)+2)) == NULL) {
error(INFO,
"/usr/src/redhat directory entry malloc: %s\n",
strerror(errno));
} else {
sprintf(searchdirs[cnt], "%s/", dirbuf);
cnt++;
}
}
if (redhat_kernel_directory_v2(dirbuf)) {
if ((searchdirs[cnt] = (char *)
malloc(strlen(dirbuf)+2)) == NULL) {
error(INFO,
"/usr/src/redhat directory entry malloc: %s\n",
strerror(errno));
} else {
sprintf(searchdirs[cnt], "%s/", dirbuf);
cnt++;
}
}
if (redhat_debug_directory(dirbuf)) {
if ((searchdirs[cnt] = (char *)
malloc(strlen(dirbuf)+2)) == NULL) {
error(INFO, "%s directory entry malloc: %s\n",
dirbuf, strerror(errno));
} else {
sprintf(searchdirs[cnt], "%s/", dirbuf);
if (preferred)
*preferred = cnt;
cnt++;
}
}
searchdirs[cnt] = NULL;
if (CRASHDEBUG(1)) {
i = start = preferred ? *preferred : 0;
do {
fprintf(fp, "searchdirs[%d]: %s\n",
i, searchdirs[i]);
if (++i == cnt) {
if (start != 0)
i = 0;
else
break;
}
} while (i != start);
}
return searchdirs;
}
static int
build_kernel_directory(char *buf)
{
char *p1, *p2;
if (!strstr(kt->proc_version, "Linux version "))
return FALSE;
BZERO(buf, BUFSIZE);
sprintf(buf, "/lib/modules/");
p1 = &kt->proc_version[strlen("Linux version ")];
p2 = &buf[strlen(buf)];
while (*p1 != ' ')
*p2++ = *p1++;
strcat(buf, "/build");
return TRUE;
}
static int
redhat_kernel_directory_v1(char *buf)
{
char *p1, *p2;
if (!strstr(kt->proc_version, "Linux version "))
return FALSE;
BZERO(buf, BUFSIZE);
sprintf(buf, "/usr/src/redhat/BUILD/kernel-");
p1 = &kt->proc_version[strlen("Linux version ")];
p2 = &buf[strlen(buf)];
while (((*p1 >= '0') && (*p1 <= '9')) || (*p1 == '.'))
*p2++ = *p1++;
strcat(buf, "/linux");
return TRUE;
}
static int
redhat_kernel_directory_v2(char *buf)
{
char *p1, *p2;
if (!strstr(kt->proc_version, "Linux version "))
return FALSE;
BZERO(buf, BUFSIZE);
sprintf(buf, "/usr/src/redhat/BUILD/kernel-");
p1 = &kt->proc_version[strlen("Linux version ")];
p2 = &buf[strlen(buf)];
while (((*p1 >= '0') && (*p1 <= '9')) || (*p1 == '.'))
*p2++ = *p1++;
strcat(buf, "/linux-");
p1 = &kt->proc_version[strlen("Linux version ")];
p2 = &buf[strlen(buf)];
while (((*p1 >= '0') && (*p1 <= '9')) || (*p1 == '.'))
*p2++ = *p1++;
return TRUE;
}
static int
redhat_debug_directory(char *buf)
{
char *p1, *p2;
if (!strstr(kt->proc_version, "Linux version "))
return FALSE;
BZERO(buf, BUFSIZE);
sprintf(buf, "%s/", pc->redhat_debug_loc);
p1 = &kt->proc_version[strlen("Linux version ")];
p2 = &buf[strlen(buf)];
while (*p1 != ' ')
*p2++ = *p1++;
return TRUE;
}
/*
* If a namelist was not entered, presume we're using the currently-running
* kernel. Read its version string from /proc/version, and then look in
* the search directories for a kernel with the same version string embedded
* in it.
*/
static int
find_booted_kernel(void)
{
char kernel[BUFSIZE];
char buffer[BUFSIZE];
char **searchdirs;
int i, preferred, wrapped;
DIR *dirp;
struct dirent *dp;
int found;
pc->flags |= FINDKERNEL;
fflush(fp);
if (!file_exists("/proc/version", NULL)) {
error(INFO,
"/proc/version: %s: cannot determine booted kernel\n",
strerror(ENOENT));
return FALSE;
}
if (!get_proc_version()) {
error(INFO, "/proc/version: %s\n", strerror(errno));
return FALSE;
}
if (CRASHDEBUG(1))
fprintf(fp, "\nfind_booted_kernel: search for [%s]\n",
kt->proc_version);
searchdirs = build_searchdirs(CREATE, &preferred);
for (i = preferred, wrapped = found = FALSE; !found; i++) {
if (!searchdirs[i]) {
if (preferred && !wrapped) {
wrapped = TRUE;
i = 0;
} else
break;
} else if (wrapped && (preferred == i))
break;
dirp = opendir(searchdirs[i]);
if (!dirp)
continue;
for (dp = readdir(dirp); dp != NULL; dp = readdir(dirp)) {
if (dp->d_name[0] == '.')
continue;
sprintf(kernel, "%s%s", searchdirs[i], dp->d_name);
if (mount_point(kernel) ||
!file_readable(kernel) ||
!is_kernel(kernel))
continue;
if (CRASHDEBUG(1))
fprintf(fp, "find_booted_kernel: check: %s\n",
kernel);
found = match_file_string(kernel, kt->proc_version, buffer);
if (found)
break;
}
closedir(dirp);
}
mount_point(DESTROY);
build_searchdirs(DESTROY, NULL);
if (found) {
if ((pc->namelist = (char *)malloc
(strlen(kernel)+1)) == NULL)
error(FATAL, "booted kernel name malloc: %s\n",
strerror(errno));
else {
strcpy(pc->namelist, kernel);
if (CRASHDEBUG(1))
fprintf(fp, "find_booted_kernel: found: %s\n",
pc->namelist);
return TRUE;
}
}
error(INFO,
"cannot find booted kernel -- please enter namelist argument\n\n");
return FALSE;
}
/*
* Determine whether a file is a mount point, without the benefit of stat().
* This horrendous kludge is necessary to avoid uninterruptible stat() or
* fstat() calls on nfs mount-points where the remote directory is no longer
* available.
*/
static int
mount_point(char *name)
{
int i;
static int mount_points_gathered = -1;
static char **mount_points;
char *arglist[MAXARGS];
char buf[BUFSIZE];
char mntfile[BUFSIZE];
int argc, found;
FILE *mp;
/*
* The first time through, stash a list of mount points.
*/
if (mount_points_gathered < 0) {
found = mount_points_gathered = 0;
if (file_exists("/proc/mounts", NULL))
sprintf(mntfile, "/proc/mounts");
else if (file_exists("/etc/mtab", NULL))
sprintf(mntfile, "/etc/mtab");
else
return FALSE;
if ((mp = fopen(mntfile, "r")) == NULL)
return FALSE;
while (fgets(buf, BUFSIZE, mp)) {
argc = parse_line(buf, arglist);
if (argc < 2)
continue;
found++;
}
pclose(mp);
if (!(mount_points = (char **)malloc(sizeof(char *) * found)))
return FALSE;
if ((mp = fopen(mntfile, "r")) == NULL)
return FALSE;
i = 0;
while (fgets(buf, BUFSIZE, mp) &&
(mount_points_gathered < found)) {
argc = parse_line(buf, arglist);
if (argc < 2)
continue;
if ((mount_points[i] = (char *)
malloc(strlen(arglist[1])*2))) {
strcpy(mount_points[i], arglist[1]);
mount_points_gathered++, i++;
}
}
pclose(mp);
if (CRASHDEBUG(2))
for (i = 0; i < mount_points_gathered; i++)
fprintf(fp, "mount_points[%d]: %s (%lx)\n",
i, mount_points[i],
(ulong)mount_points[i]);
}
/*
* A null name string means we're done with this routine forever,
* so the malloc'd memory can be freed.
*/
if (!name) {
for (i = 0; i < mount_points_gathered; i++)
free(mount_points[i]);
free(mount_points);
return FALSE;
}
for (i = 0; i < mount_points_gathered; i++) {
if (STREQ(name, mount_points[i]))
return TRUE;
}
return FALSE;
}
/*
* If /proc/version exists, get it for verification purposes later.
*/
int
get_proc_version(void)
{
FILE *version;
if (strlen(kt->proc_version)) /* been here, done that... */
return TRUE;
if (!file_exists("/proc/version", NULL))
return FALSE;
if ((version = fopen("/proc/version", "r")) == NULL)
return FALSE;
if (fread(&kt->proc_version, sizeof(char),
BUFSIZE-1, version) <= 0) {
fclose(version);
return FALSE;
}
fclose(version);
strip_linefeeds(kt->proc_version);
return TRUE;
}
/*
* Given a non-matching kernel namelist, try to find a System.map file
* that has a system_utsname whose contents match /proc/version.
*/
static int
find_booted_system_map(void)
{
char system_map[BUFSIZE];
char **searchdirs;
int i;
DIR *dirp;
struct dirent *dp;
int found;
fflush(fp);
if (!file_exists("/proc/version", NULL)) {
error(INFO,
"/proc/version: %s: cannot determine booted System.map\n",
strerror(ENOENT));
return FALSE;
}
if (!get_proc_version()) {
error(INFO, "/proc/version: %s\n", strerror(errno));
return FALSE;
}
found = FALSE;
/*
* To avoid a search, try the obvious first.
*/
sprintf(system_map, "/boot/System.map");
if (file_readable(system_map) && verify_utsname(system_map)) {
found = TRUE;
} else {
searchdirs = build_searchdirs(CREATE, NULL);
for (i = 0; !found && searchdirs[i]; i++) {
dirp = opendir(searchdirs[i]);
if (!dirp)
continue;
for (dp = readdir(dirp); dp != NULL;
dp = readdir(dirp)) {
if (!strstr(dp->d_name, "System.map"))
continue;
sprintf(system_map, "%s%s", searchdirs[i],
dp->d_name);
if (mount_point(system_map) ||
!file_readable(system_map) ||
!is_system_map(system_map))
continue;
if (verify_utsname(system_map)) {
found = TRUE;
break;
}
}
closedir(dirp);
}
mount_point(DESTROY);
build_searchdirs(DESTROY, NULL);
}
if (found) {
if ((pc->system_map = (char *)malloc
(strlen(system_map)+1)) == NULL)
error(FATAL, "booted system map name malloc: %s\n",
strerror(errno));
strcpy(pc->system_map, system_map);
if (CRASHDEBUG(1))
fprintf(fp, "find_booted_system_map: found: %s\n",
pc->system_map);
return TRUE;
}
error(INFO,
"cannot find booted system map -- please enter namelist or system map\n\n");
return FALSE;
}
/*
* Read the system_utsname from /dev/mem, based upon the address found
* in the passed-in System.map file, and compare it to /proc/version.
*/
static int
verify_utsname(char *system_map)
{
char buffer[BUFSIZE];
ulong value;
struct new_utsname new_utsname;
if (CRASHDEBUG(1))
fprintf(fp, "verify_utsname: check: %s\n", system_map);
if (!match_file_string(system_map, "D system_utsname", buffer))
return FALSE;
if (extract_hex(buffer, &value, NULLCHAR, TRUE) &&
(READMEM(pc->mfd, &new_utsname,
sizeof(struct new_utsname), value,
VTOP(value)) > 0) &&
ascii_string(new_utsname.release) &&
ascii_string(new_utsname.version) &&
STRNEQ(new_utsname.release, "2.") &&
(strlen(new_utsname.release) > 4) &&
(strlen(new_utsname.version) > 27)) {
if (CRASHDEBUG(1)) {
fprintf(fp, "release: [%s]\n", new_utsname.release);
fprintf(fp, "version: [%s]\n", new_utsname.version);
}
if (strstr(kt->proc_version, new_utsname.release) &&
strstr(kt->proc_version, new_utsname.version)) {
return TRUE;
}
}
return FALSE;
}
/*
* Determine whether a file exists, using the caller's stat structure if
* one was passed in.
*/
int
file_exists(char *file, struct stat *sp)
{
struct stat sbuf;
if (stat(file, sp ? sp : &sbuf) == 0)
return TRUE;
return FALSE;
}
/*
* Determine whether a file exists, and if so, if it's readable.
*/
int
file_readable(char *file)
{
char tmp;
int fd;
if (!file_exists(file, NULL))
return FALSE;
if ((fd = open(file, O_RDONLY)) < 0)
return FALSE;
if (read(fd, &tmp, sizeof(tmp)) != sizeof(tmp)) {
close(fd);
return FALSE;
}
close(fd);
return TRUE;
}
/*
* Quick file checksummer.
*/
int
file_checksum(char *file, long *retsum)
{
int i;
int fd;
ssize_t cnt;
char buf[MIN_PAGE_SIZE];
long csum;
if ((fd = open(file, O_RDONLY)) < 0)
return FALSE;
csum = 0;
BZERO(buf, MIN_PAGE_SIZE);
while ((cnt = read(fd, buf, MIN_PAGE_SIZE)) > 0) {
for (i = 0; i < cnt; i++)
csum += buf[i];
BZERO(buf, MIN_PAGE_SIZE);
}
close(fd);
*retsum = csum;
return TRUE;
}
int
is_directory(char *file)
{
struct stat sbuf;
if (!file || !strlen(file))
return(FALSE);
if (stat(file, &sbuf) == -1)
return(FALSE); /* This file doesn't exist. */
return((sbuf.st_mode & S_IFMT) == S_IFDIR ? TRUE : FALSE);
}