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ndg/lib/nif/wpa_supplicant/os_unix.c

854 lines
15 KiB
C

/*
* OS specific functions for UNIX/POSIX systems
* Copyright (c) 2005-2019, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include <time.h>
#include <sys/wait.h>
#ifdef ANDROID
#include <sys/capability.h>
#include <sys/prctl.h>
#include <private/android_filesystem_config.h>
#endif /* ANDROID */
#ifdef __MACH__
#include <CoreServices/CoreServices.h>
#include <mach/mach.h>
#include <mach/mach_time.h>
#endif /* __MACH__ */
#include "os.h"
#include "common.h"
#ifdef WPA_TRACE
#include "wpa_debug.h"
#include "trace.h"
#include "list.h"
static struct dl_list alloc_list = DL_LIST_HEAD_INIT(alloc_list);
#define ALLOC_MAGIC 0xa84ef1b2
#define FREED_MAGIC 0x67fd487a
struct os_alloc_trace {
unsigned int magic;
struct dl_list list __attribute__((aligned(16)));
size_t len;
WPA_TRACE_INFO
} __attribute__((aligned(16)));
#endif /* WPA_TRACE */
void os_sleep(os_time_t sec, os_time_t usec)
{
#if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200809L)
const struct timespec req = { sec, usec * 1000 };
nanosleep(&req, NULL);
#else
if (sec)
sleep(sec);
if (usec)
usleep(usec);
#endif
}
int os_get_time(struct os_time *t)
{
int res;
struct timeval tv;
res = gettimeofday(&tv, NULL);
t->sec = tv.tv_sec;
t->usec = tv.tv_usec;
return res;
}
int os_get_reltime(struct os_reltime *t)
{
#ifndef __MACH__
#if defined(CLOCK_BOOTTIME)
static clockid_t clock_id = CLOCK_BOOTTIME;
#elif defined(CLOCK_MONOTONIC)
static clockid_t clock_id = CLOCK_MONOTONIC;
#else
static clockid_t clock_id = CLOCK_REALTIME;
#endif
struct timespec ts;
int res;
if (TEST_FAIL())
return -1;
while (1) {
res = clock_gettime(clock_id, &ts);
if (res == 0) {
t->sec = ts.tv_sec;
t->usec = ts.tv_nsec / 1000;
return 0;
}
switch (clock_id) {
#ifdef CLOCK_BOOTTIME
case CLOCK_BOOTTIME:
clock_id = CLOCK_MONOTONIC;
break;
#endif
#ifdef CLOCK_MONOTONIC
case CLOCK_MONOTONIC:
clock_id = CLOCK_REALTIME;
break;
#endif
case CLOCK_REALTIME:
return -1;
}
}
#else /* __MACH__ */
uint64_t abstime, nano;
static mach_timebase_info_data_t info = { 0, 0 };
if (!info.denom) {
if (mach_timebase_info(&info) != KERN_SUCCESS)
return -1;
}
abstime = mach_absolute_time();
nano = (abstime * info.numer) / info.denom;
t->sec = nano / NSEC_PER_SEC;
t->usec = (nano - (((uint64_t) t->sec) * NSEC_PER_SEC)) / NSEC_PER_USEC;
return 0;
#endif /* __MACH__ */
}
int os_mktime(int year, int month, int day, int hour, int min, int sec,
os_time_t *t)
{
struct tm tm, *tm1;
time_t t_local, t1, t2;
os_time_t tz_offset;
if (year < 1970 || month < 1 || month > 12 || day < 1 || day > 31 ||
hour < 0 || hour > 23 || min < 0 || min > 59 || sec < 0 ||
sec > 60)
return -1;
memset(&tm, 0, sizeof(tm));
tm.tm_year = year - 1900;
tm.tm_mon = month - 1;
tm.tm_mday = day;
tm.tm_hour = hour;
tm.tm_min = min;
tm.tm_sec = sec;
t_local = mktime(&tm);
/* figure out offset to UTC */
tm1 = localtime(&t_local);
if (tm1) {
t1 = mktime(tm1);
tm1 = gmtime(&t_local);
if (tm1) {
t2 = mktime(tm1);
tz_offset = t2 - t1;
} else
tz_offset = 0;
} else
tz_offset = 0;
*t = (os_time_t) t_local - tz_offset;
return 0;
}
int os_gmtime(os_time_t t, struct os_tm *tm)
{
struct tm *tm2;
time_t t2 = t;
tm2 = gmtime(&t2);
if (tm2 == NULL)
return -1;
tm->sec = tm2->tm_sec;
tm->min = tm2->tm_min;
tm->hour = tm2->tm_hour;
tm->day = tm2->tm_mday;
tm->month = tm2->tm_mon + 1;
tm->year = tm2->tm_year + 1900;
return 0;
}
#ifdef __APPLE__
#include <fcntl.h>
static int os_daemon(int nochdir, int noclose)
{
int devnull;
if (chdir("/") < 0)
return -1;
devnull = open("/dev/null", O_RDWR);
if (devnull < 0)
return -1;
if (dup2(devnull, STDIN_FILENO) < 0) {
close(devnull);
return -1;
}
if (dup2(devnull, STDOUT_FILENO) < 0) {
close(devnull);
return -1;
}
if (dup2(devnull, STDERR_FILENO) < 0) {
close(devnull);
return -1;
}
return 0;
}
#else /* __APPLE__ */
#define os_daemon daemon
#endif /* __APPLE__ */
int os_daemonize(const char *pid_file)
{
#if defined(__uClinux__) || defined(__sun__)
return -1;
#else /* defined(__uClinux__) || defined(__sun__) */
if (os_daemon(0, 0)) {
perror("daemon");
return -1;
}
if (pid_file) {
FILE *f = fopen(pid_file, "w");
if (f) {
fprintf(f, "%u\n", getpid());
fclose(f);
}
}
return -0;
#endif /* defined(__uClinux__) || defined(__sun__) */
}
void os_daemonize_terminate(const char *pid_file)
{
if (pid_file)
unlink(pid_file);
}
int os_get_random(unsigned char *buf, size_t len)
{
#ifdef TEST_FUZZ
size_t i;
for (i = 0; i < len; i++)
buf[i] = i & 0xff;
return 0;
#else /* TEST_FUZZ */
FILE *f;
size_t rc;
if (TEST_FAIL())
return -1;
f = fopen("/dev/urandom", "rb");
if (f == NULL) {
printf("Could not open /dev/urandom.\n");
return -1;
}
rc = fread(buf, 1, len, f);
fclose(f);
return rc != len ? -1 : 0;
#endif /* TEST_FUZZ */
}
unsigned long os_random(void)
{
return random();
}
char * os_rel2abs_path(const char *rel_path)
{
char *buf = NULL, *cwd, *ret;
size_t len = 128, cwd_len, rel_len, ret_len;
int last_errno;
if (!rel_path)
return NULL;
if (rel_path[0] == '/')
return os_strdup(rel_path);
for (;;) {
buf = os_malloc(len);
if (buf == NULL)
return NULL;
cwd = getcwd(buf, len);
if (cwd == NULL) {
last_errno = errno;
os_free(buf);
if (last_errno != ERANGE)
return NULL;
len *= 2;
if (len > 2000)
return NULL;
} else {
buf[len - 1] = '\0';
break;
}
}
cwd_len = os_strlen(cwd);
rel_len = os_strlen(rel_path);
ret_len = cwd_len + 1 + rel_len + 1;
ret = os_malloc(ret_len);
if (ret) {
os_memcpy(ret, cwd, cwd_len);
ret[cwd_len] = '/';
os_memcpy(ret + cwd_len + 1, rel_path, rel_len);
ret[ret_len - 1] = '\0';
}
os_free(buf);
return ret;
}
int os_program_init(void)
{
unsigned int seed;
#ifdef ANDROID
/*
* We ignore errors here since errors are normal if we
* are already running as non-root.
*/
#ifdef ANDROID_SETGROUPS_OVERRIDE
gid_t groups[] = { ANDROID_SETGROUPS_OVERRIDE };
#else /* ANDROID_SETGROUPS_OVERRIDE */
gid_t groups[] = { AID_INET, AID_WIFI, AID_KEYSTORE };
#endif /* ANDROID_SETGROUPS_OVERRIDE */
struct __user_cap_header_struct header;
struct __user_cap_data_struct cap;
setgroups(ARRAY_SIZE(groups), groups);
prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0);
setgid(AID_WIFI);
setuid(AID_WIFI);
header.version = _LINUX_CAPABILITY_VERSION;
header.pid = 0;
cap.effective = cap.permitted =
(1 << CAP_NET_ADMIN) | (1 << CAP_NET_RAW);
cap.inheritable = 0;
capset(&header, &cap);
#endif /* ANDROID */
if (os_get_random((unsigned char *) &seed, sizeof(seed)) == 0)
srandom(seed);
return 0;
}
void os_program_deinit(void)
{
#ifdef WPA_TRACE
struct os_alloc_trace *a;
unsigned long total = 0;
dl_list_for_each(a, &alloc_list, struct os_alloc_trace, list) {
total += a->len;
if (a->magic != ALLOC_MAGIC) {
wpa_printf(MSG_INFO, "MEMLEAK[%p]: invalid magic 0x%x "
"len %lu",
a, a->magic, (unsigned long) a->len);
continue;
}
wpa_printf(MSG_INFO, "MEMLEAK[%p]: len %lu",
a, (unsigned long) a->len);
wpa_trace_dump("memleak", a);
}
if (total)
wpa_printf(MSG_INFO, "MEMLEAK: total %lu bytes",
(unsigned long) total);
wpa_trace_deinit();
#endif /* WPA_TRACE */
}
int os_setenv(const char *name, const char *value, int overwrite)
{
return setenv(name, value, overwrite);
}
int os_unsetenv(const char *name)
{
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__APPLE__) || \
defined(__OpenBSD__)
unsetenv(name);
return 0;
#else
return unsetenv(name);
#endif
}
char * os_readfile(const char *name, size_t *len)
{
FILE *f;
char *buf;
long pos;
f = fopen(name, "rb");
if (f == NULL)
return NULL;
if (fseek(f, 0, SEEK_END) < 0 || (pos = ftell(f)) < 0) {
fclose(f);
return NULL;
}
*len = pos;
if (fseek(f, 0, SEEK_SET) < 0) {
fclose(f);
return NULL;
}
buf = os_malloc(*len);
if (buf == NULL) {
fclose(f);
return NULL;
}
if (fread(buf, 1, *len, f) != *len) {
fclose(f);
os_free(buf);
return NULL;
}
fclose(f);
return buf;
}
int os_file_exists(const char *fname)
{
return access(fname, F_OK) == 0;
}
int os_fdatasync(FILE *stream)
{
if (!fflush(stream)) {
#if defined __FreeBSD__ || defined __linux__
return fdatasync(fileno(stream));
#else /* !__linux__ && !__FreeBSD__ */
#ifdef F_FULLFSYNC
/* OS X does not implement fdatasync(). */
return fcntl(fileno(stream), F_FULLFSYNC);
#else /* F_FULLFSYNC */
return fsync(fileno(stream));
#endif /* F_FULLFSYNC */
#endif /* __linux__ */
}
return -1;
}
#ifndef WPA_TRACE
void * os_zalloc(size_t size)
{
return calloc(1, size);
}
#endif /* WPA_TRACE */
size_t os_strlcpy(char *dest, const char *src, size_t siz)
{
const char *s = src;
size_t left = siz;
if (left) {
/* Copy string up to the maximum size of the dest buffer */
while (--left != 0) {
if ((*dest++ = *s++) == '\0')
break;
}
}
if (left == 0) {
/* Not enough room for the string; force NUL-termination */
if (siz != 0)
*dest = '\0';
while (*s++)
; /* determine total src string length */
}
return s - src - 1;
}
int os_memcmp_const(const void *a, const void *b, size_t len)
{
const u8 *aa = a;
const u8 *bb = b;
size_t i;
u8 res;
for (res = 0, i = 0; i < len; i++)
res |= aa[i] ^ bb[i];
return res;
}
void * os_memdup(const void *src, size_t len)
{
void *r = os_malloc(len);
if (r && src)
os_memcpy(r, src, len);
return r;
}
#ifdef WPA_TRACE
#if defined(WPA_TRACE_BFD) && defined(CONFIG_TESTING_OPTIONS)
char wpa_trace_fail_func[256] = { 0 };
unsigned int wpa_trace_fail_after;
static int testing_fail_alloc(void)
{
const char *func[WPA_TRACE_LEN];
size_t i, res, len;
char *pos, *next;
int match;
if (!wpa_trace_fail_after)
return 0;
res = wpa_trace_calling_func(func, WPA_TRACE_LEN);
i = 0;
if (i < res && os_strcmp(func[i], __func__) == 0)
i++;
if (i < res && os_strcmp(func[i], "os_malloc") == 0)
i++;
if (i < res && os_strcmp(func[i], "os_zalloc") == 0)
i++;
if (i < res && os_strcmp(func[i], "os_calloc") == 0)
i++;
if (i < res && os_strcmp(func[i], "os_realloc") == 0)
i++;
if (i < res && os_strcmp(func[i], "os_realloc_array") == 0)
i++;
if (i < res && os_strcmp(func[i], "os_strdup") == 0)
i++;
if (i < res && os_strcmp(func[i], "os_memdup") == 0)
i++;
pos = wpa_trace_fail_func;
match = 0;
while (i < res) {
int allow_skip = 1;
int maybe = 0;
if (*pos == '=') {
allow_skip = 0;
pos++;
} else if (*pos == '?') {
maybe = 1;
pos++;
}
next = os_strchr(pos, ';');
if (next)
len = next - pos;
else
len = os_strlen(pos);
if (os_memcmp(pos, func[i], len) != 0) {
if (maybe && next) {
pos = next + 1;
continue;
}
if (allow_skip) {
i++;
continue;
}
return 0;
}
if (!next) {
match = 1;
break;
}
pos = next + 1;
i++;
}
if (!match)
return 0;
wpa_trace_fail_after--;
if (wpa_trace_fail_after == 0) {
wpa_printf(MSG_INFO, "TESTING: fail allocation at %s",
wpa_trace_fail_func);
for (i = 0; i < res; i++)
wpa_printf(MSG_INFO, "backtrace[%d] = %s",
(int) i, func[i]);
return 1;
}
return 0;
}
char wpa_trace_test_fail_func[256] = { 0 };
unsigned int wpa_trace_test_fail_after;
int testing_test_fail(void)
{
const char *func[WPA_TRACE_LEN];
size_t i, res, len;
char *pos, *next;
int match;
if (!wpa_trace_test_fail_after)
return 0;
res = wpa_trace_calling_func(func, WPA_TRACE_LEN);
i = 0;
if (i < res && os_strcmp(func[i], __func__) == 0)
i++;
pos = wpa_trace_test_fail_func;
match = 0;
while (i < res) {
int allow_skip = 1;
int maybe = 0;
if (*pos == '=') {
allow_skip = 0;
pos++;
} else if (*pos == '?') {
maybe = 1;
pos++;
}
next = os_strchr(pos, ';');
if (next)
len = next - pos;
else
len = os_strlen(pos);
if (os_memcmp(pos, func[i], len) != 0) {
if (maybe && next) {
pos = next + 1;
continue;
}
if (allow_skip) {
i++;
continue;
}
return 0;
}
if (!next) {
match = 1;
break;
}
pos = next + 1;
i++;
}
if (!match)
return 0;
wpa_trace_test_fail_after--;
if (wpa_trace_test_fail_after == 0) {
wpa_printf(MSG_INFO, "TESTING: fail at %s",
wpa_trace_test_fail_func);
for (i = 0; i < res; i++)
wpa_printf(MSG_INFO, "backtrace[%d] = %s",
(int) i, func[i]);
return 1;
}
return 0;
}
#else
static inline int testing_fail_alloc(void)
{
return 0;
}
#endif
void * os_malloc(size_t size)
{
struct os_alloc_trace *a;
if (testing_fail_alloc())
return NULL;
a = malloc(sizeof(*a) + size);
if (a == NULL)
return NULL;
a->magic = ALLOC_MAGIC;
dl_list_add(&alloc_list, &a->list);
a->len = size;
wpa_trace_record(a);
return a + 1;
}
void * os_realloc(void *ptr, size_t size)
{
struct os_alloc_trace *a;
size_t copy_len;
void *n;
if (ptr == NULL)
return os_malloc(size);
a = (struct os_alloc_trace *) ptr - 1;
if (a->magic != ALLOC_MAGIC) {
wpa_printf(MSG_INFO, "REALLOC[%p]: invalid magic 0x%x%s",
a, a->magic,
a->magic == FREED_MAGIC ? " (already freed)" : "");
wpa_trace_show("Invalid os_realloc() call");
abort();
}
n = os_malloc(size);
if (n == NULL)
return NULL;
copy_len = a->len;
if (copy_len > size)
copy_len = size;
os_memcpy(n, a + 1, copy_len);
os_free(ptr);
return n;
}
void os_free(void *ptr)
{
struct os_alloc_trace *a;
if (ptr == NULL)
return;
a = (struct os_alloc_trace *) ptr - 1;
if (a->magic != ALLOC_MAGIC) {
wpa_printf(MSG_INFO, "FREE[%p]: invalid magic 0x%x%s",
a, a->magic,
a->magic == FREED_MAGIC ? " (already freed)" : "");
wpa_trace_show("Invalid os_free() call");
abort();
}
dl_list_del(&a->list);
a->magic = FREED_MAGIC;
wpa_trace_check_ref(ptr);
free(a);
}
void * os_zalloc(size_t size)
{
void *ptr = os_malloc(size);
if (ptr)
os_memset(ptr, 0, size);
return ptr;
}
char * os_strdup(const char *s)
{
size_t len;
char *d;
len = os_strlen(s);
d = os_malloc(len + 1);
if (d == NULL)
return NULL;
os_memcpy(d, s, len);
d[len] = '\0';
return d;
}
#endif /* WPA_TRACE */
int os_exec(const char *program, const char *arg, int wait_completion)
{
pid_t pid;
int pid_status;
pid = fork();
if (pid < 0) {
perror("fork");
return -1;
}
if (pid == 0) {
/* run the external command in the child process */
const int MAX_ARG = 30;
char *_program, *_arg, *pos;
char *argv[MAX_ARG + 1];
int i;
_program = os_strdup(program);
_arg = os_strdup(arg);
argv[0] = _program;
i = 1;
pos = _arg;
while (i < MAX_ARG && pos && *pos) {
while (*pos == ' ')
pos++;
if (*pos == '\0')
break;
argv[i++] = pos;
pos = os_strchr(pos, ' ');
if (pos)
*pos++ = '\0';
}
argv[i] = NULL;
execv(program, argv);
perror("execv");
os_free(_program);
os_free(_arg);
exit(0);
return -1;
}
if (wait_completion) {
/* wait for the child process to complete in the parent */
waitpid(pid, &pid_status, 0);
}
return 0;
}