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fragattacks/src/utils/wpa_debug.c
Jouni Malinen d85e1fc8a5 Check os_snprintf() result more consistently - automatic 1 
This converts os_snprintf() result validation cases to use
os_snprintf_error() where the exact rule used in os_snprintf_error() was
used. These changes were done automatically with spatch using the
following semantic patch:

@@
identifier E1;
expression E2,E3,E4,E5,E6;
statement S1;
@@

(
  E1 = os_snprintf(E2, E3, ...);
|
  int E1 = os_snprintf(E2, E3, ...);
|
  if (E5)
	E1 = os_snprintf(E2, E3, ...);
  else
	E1 = os_snprintf(E2, E3, ...);
|
  if (E5)
	E1 = os_snprintf(E2, E3, ...);
  else if (E6)
	E1 = os_snprintf(E2, E3, ...);
  else
	E1 = 0;
|
  if (E5) {
	...
	E1 = os_snprintf(E2, E3, ...);
  } else {
	...
	return -1;
  }
|
  if (E5) {
	...
	E1 = os_snprintf(E2, E3, ...);
  } else if (E6) {
	...
	E1 = os_snprintf(E2, E3, ...);
  } else {
	...
	return -1;
  }
|
  if (E5) {
	...
	E1 = os_snprintf(E2, E3, ...);
  } else {
	...
	E1 = os_snprintf(E2, E3, ...);
  }
)
? os_free(E4);
- if (E1 < 0 || \( E1 >= E3 \| (size_t) E1 >= E3 \| (unsigned int) E1 >= E3 \| E1 >= (int) E3 \))
+ if (os_snprintf_error(E3, E1))
(
  S1
|
{ ... }
)

Signed-off-by: Jouni Malinen <j@w1.fi>
2014-12-08 11:42:07 +02:00

787 lines
16 KiB
C
Raw Blame History

/*
* wpa_supplicant/hostapd / Debug prints
* Copyright (c) 2002-2013, 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 "common.h"
#ifdef CONFIG_DEBUG_SYSLOG
#include <syslog.h>
static int wpa_debug_syslog = 0;
#endif /* CONFIG_DEBUG_SYSLOG */
#ifdef CONFIG_DEBUG_LINUX_TRACING
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
static FILE *wpa_debug_tracing_file = NULL;
#define WPAS_TRACE_PFX "wpas <%d>: "
#endif /* CONFIG_DEBUG_LINUX_TRACING */
int wpa_debug_level = MSG_INFO;
int wpa_debug_show_keys = 0;
int wpa_debug_timestamp = 0;
#ifdef CONFIG_ANDROID_LOG
#include <android/log.h>
#ifndef ANDROID_LOG_NAME
#define ANDROID_LOG_NAME "wpa_supplicant"
#endif /* ANDROID_LOG_NAME */
static int wpa_to_android_level(int level)
{
if (level == MSG_ERROR)
return ANDROID_LOG_ERROR;
if (level == MSG_WARNING)
return ANDROID_LOG_WARN;
if (level == MSG_INFO)
return ANDROID_LOG_INFO;
return ANDROID_LOG_DEBUG;
}
#endif /* CONFIG_ANDROID_LOG */
#ifndef CONFIG_NO_STDOUT_DEBUG
#ifdef CONFIG_DEBUG_FILE
static FILE *out_file = NULL;
#endif /* CONFIG_DEBUG_FILE */
void wpa_debug_print_timestamp(void)
{
#ifndef CONFIG_ANDROID_LOG
struct os_time tv;
if (!wpa_debug_timestamp)
return;
os_get_time(&tv);
#ifdef CONFIG_DEBUG_FILE
if (out_file) {
fprintf(out_file, "%ld.%06u: ", (long) tv.sec,
(unsigned int) tv.usec);
} else
#endif /* CONFIG_DEBUG_FILE */
printf("%ld.%06u: ", (long) tv.sec, (unsigned int) tv.usec);
#endif /* CONFIG_ANDROID_LOG */
}
#ifdef CONFIG_DEBUG_SYSLOG
#ifndef LOG_HOSTAPD
#define LOG_HOSTAPD LOG_DAEMON
#endif /* LOG_HOSTAPD */
void wpa_debug_open_syslog(void)
{
openlog("wpa_supplicant", LOG_PID | LOG_NDELAY, LOG_HOSTAPD);
wpa_debug_syslog++;
}
void wpa_debug_close_syslog(void)
{
if (wpa_debug_syslog)
closelog();
}
static int syslog_priority(int level)
{
switch (level) {
case MSG_MSGDUMP:
case MSG_DEBUG:
return LOG_DEBUG;
case MSG_INFO:
return LOG_NOTICE;
case MSG_WARNING:
return LOG_WARNING;
case MSG_ERROR:
return LOG_ERR;
}
return LOG_INFO;
}
#endif /* CONFIG_DEBUG_SYSLOG */
#ifdef CONFIG_DEBUG_LINUX_TRACING
int wpa_debug_open_linux_tracing(void)
{
int mounts, trace_fd;
char buf[4096] = {};
ssize_t buflen;
char *line, *tmp1, *path = NULL;
mounts = open("/proc/mounts", O_RDONLY);
if (mounts < 0) {
printf("no /proc/mounts\n");
return -1;
}
buflen = read(mounts, buf, sizeof(buf) - 1);
close(mounts);
if (buflen < 0) {
printf("failed to read /proc/mounts\n");
return -1;
}
line = strtok_r(buf, "\n", &tmp1);
while (line) {
char *tmp2, *tmp_path, *fstype;
/* "<dev> <mountpoint> <fs type> ..." */
strtok_r(line, " ", &tmp2);
tmp_path = strtok_r(NULL, " ", &tmp2);
fstype = strtok_r(NULL, " ", &tmp2);
if (strcmp(fstype, "debugfs") == 0) {
path = tmp_path;
break;
}
line = strtok_r(NULL, "\n", &tmp1);
}
if (path == NULL) {
printf("debugfs mountpoint not found\n");
return -1;
}
snprintf(buf, sizeof(buf) - 1, "%s/tracing/trace_marker", path);
trace_fd = open(buf, O_WRONLY);
if (trace_fd < 0) {
printf("failed to open trace_marker file\n");
return -1;
}
wpa_debug_tracing_file = fdopen(trace_fd, "w");
if (wpa_debug_tracing_file == NULL) {
close(trace_fd);
printf("failed to fdopen()\n");
return -1;
}
return 0;
}
void wpa_debug_close_linux_tracing(void)
{
if (wpa_debug_tracing_file == NULL)
return;
fclose(wpa_debug_tracing_file);
wpa_debug_tracing_file = NULL;
}
#endif /* CONFIG_DEBUG_LINUX_TRACING */
/**
* wpa_printf - conditional printf
* @level: priority level (MSG_*) of the message
* @fmt: printf format string, followed by optional arguments
*
* This function is used to print conditional debugging and error messages. The
* output may be directed to stdout, stderr, and/or syslog based on
* configuration.
*
* Note: New line '\n' is added to the end of the text when printing to stdout.
*/
void wpa_printf(int level, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (level >= wpa_debug_level) {
#ifdef CONFIG_ANDROID_LOG
__android_log_vprint(wpa_to_android_level(level),
ANDROID_LOG_NAME, fmt, ap);
#else /* CONFIG_ANDROID_LOG */
#ifdef CONFIG_DEBUG_SYSLOG
if (wpa_debug_syslog) {
vsyslog(syslog_priority(level), fmt, ap);
} else {
#endif /* CONFIG_DEBUG_SYSLOG */
wpa_debug_print_timestamp();
#ifdef CONFIG_DEBUG_FILE
if (out_file) {
vfprintf(out_file, fmt, ap);
fprintf(out_file, "\n");
} else {
#endif /* CONFIG_DEBUG_FILE */
vprintf(fmt, ap);
printf("\n");
#ifdef CONFIG_DEBUG_FILE
}
#endif /* CONFIG_DEBUG_FILE */
#ifdef CONFIG_DEBUG_SYSLOG
}
#endif /* CONFIG_DEBUG_SYSLOG */
#endif /* CONFIG_ANDROID_LOG */
}
va_end(ap);
#ifdef CONFIG_DEBUG_LINUX_TRACING
if (wpa_debug_tracing_file != NULL) {
va_start(ap, fmt);
fprintf(wpa_debug_tracing_file, WPAS_TRACE_PFX, level);
vfprintf(wpa_debug_tracing_file, fmt, ap);
fprintf(wpa_debug_tracing_file, "\n");
fflush(wpa_debug_tracing_file);
va_end(ap);
}
#endif /* CONFIG_DEBUG_LINUX_TRACING */
}
static void _wpa_hexdump(int level, const char *title, const u8 *buf,
size_t len, int show)
{
size_t i;
#ifdef CONFIG_DEBUG_LINUX_TRACING
if (wpa_debug_tracing_file != NULL) {
fprintf(wpa_debug_tracing_file,
WPAS_TRACE_PFX "%s - hexdump(len=%lu):",
level, title, (unsigned long) len);
if (buf == NULL) {
fprintf(wpa_debug_tracing_file, " [NULL]\n");
} else if (!show) {
fprintf(wpa_debug_tracing_file, " [REMOVED]\n");
} else {
for (i = 0; i < len; i++)
fprintf(wpa_debug_tracing_file,
" %02x", buf[i]);
}
fflush(wpa_debug_tracing_file);
}
#endif /* CONFIG_DEBUG_LINUX_TRACING */
if (level < wpa_debug_level)
return;
#ifdef CONFIG_ANDROID_LOG
{
const char *display;
char *strbuf = NULL;
size_t slen = len;
if (buf == NULL) {
display = " [NULL]";
} else if (len == 0) {
display = "";
} else if (show && len) {
/* Limit debug message length for Android log */
if (slen > 32)
slen = 32;
strbuf = os_malloc(1 + 3 * slen);
if (strbuf == NULL) {
wpa_printf(MSG_ERROR, "wpa_hexdump: Failed to "
"allocate message buffer");
return;
}
for (i = 0; i < slen; i++)
os_snprintf(&strbuf[i * 3], 4, " %02x",
buf[i]);
display = strbuf;
} else {
display = " [REMOVED]";
}
__android_log_print(wpa_to_android_level(level),
ANDROID_LOG_NAME,
"%s - hexdump(len=%lu):%s%s",
title, (long unsigned int) len, display,
len > slen ? " ..." : "");
os_free(strbuf);
return;
}
#else /* CONFIG_ANDROID_LOG */
#ifdef CONFIG_DEBUG_SYSLOG
if (wpa_debug_syslog) {
const char *display;
char *strbuf = NULL;
if (buf == NULL) {
display = " [NULL]";
} else if (len == 0) {
display = "";
} else if (show && len) {
strbuf = os_malloc(1 + 3 * len);
if (strbuf == NULL) {
wpa_printf(MSG_ERROR, "wpa_hexdump: Failed to "
"allocate message buffer");
return;
}
for (i = 0; i < len; i++)
os_snprintf(&strbuf[i * 3], 4, " %02x",
buf[i]);
display = strbuf;
} else {
display = " [REMOVED]";
}
syslog(syslog_priority(level), "%s - hexdump(len=%lu):%s",
title, (unsigned long) len, display);
os_free(strbuf);
return;
}
#endif /* CONFIG_DEBUG_SYSLOG */
wpa_debug_print_timestamp();
#ifdef CONFIG_DEBUG_FILE
if (out_file) {
fprintf(out_file, "%s - hexdump(len=%lu):",
title, (unsigned long) len);
if (buf == NULL) {
fprintf(out_file, " [NULL]");
} else if (show) {
for (i = 0; i < len; i++)
fprintf(out_file, " %02x", buf[i]);
} else {
fprintf(out_file, " [REMOVED]");
}
fprintf(out_file, "\n");
} else {
#endif /* CONFIG_DEBUG_FILE */
printf("%s - hexdump(len=%lu):", title, (unsigned long) len);
if (buf == NULL) {
printf(" [NULL]");
} else if (show) {
for (i = 0; i < len; i++)
printf(" %02x", buf[i]);
} else {
printf(" [REMOVED]");
}
printf("\n");
#ifdef CONFIG_DEBUG_FILE
}
#endif /* CONFIG_DEBUG_FILE */
#endif /* CONFIG_ANDROID_LOG */
}
void wpa_hexdump(int level, const char *title, const void *buf, size_t len)
{
_wpa_hexdump(level, title, buf, len, 1);
}
void wpa_hexdump_key(int level, const char *title, const void *buf, size_t len)
{
_wpa_hexdump(level, title, buf, len, wpa_debug_show_keys);
}
static void _wpa_hexdump_ascii(int level, const char *title, const void *buf,
size_t len, int show)
{
size_t i, llen;
const u8 *pos = buf;
const size_t line_len = 16;
#ifdef CONFIG_DEBUG_LINUX_TRACING
if (wpa_debug_tracing_file != NULL) {
fprintf(wpa_debug_tracing_file,
WPAS_TRACE_PFX "%s - hexdump_ascii(len=%lu):",
level, title, (unsigned long) len);
if (buf == NULL) {
fprintf(wpa_debug_tracing_file, " [NULL]\n");
} else if (!show) {
fprintf(wpa_debug_tracing_file, " [REMOVED]\n");
} else {
/* can do ascii processing in userspace */
for (i = 0; i < len; i++)
fprintf(wpa_debug_tracing_file,
" %02x", pos[i]);
}
fflush(wpa_debug_tracing_file);
}
#endif /* CONFIG_DEBUG_LINUX_TRACING */
if (level < wpa_debug_level)
return;
#ifdef CONFIG_ANDROID_LOG
_wpa_hexdump(level, title, buf, len, show);
#else /* CONFIG_ANDROID_LOG */
wpa_debug_print_timestamp();
#ifdef CONFIG_DEBUG_FILE
if (out_file) {
if (!show) {
fprintf(out_file,
"%s - hexdump_ascii(len=%lu): [REMOVED]\n",
title, (unsigned long) len);
return;
}
if (buf == NULL) {
fprintf(out_file,
"%s - hexdump_ascii(len=%lu): [NULL]\n",
title, (unsigned long) len);
return;
}
fprintf(out_file, "%s - hexdump_ascii(len=%lu):\n",
title, (unsigned long) len);
while (len) {
llen = len > line_len ? line_len : len;
fprintf(out_file, " ");
for (i = 0; i < llen; i++)
fprintf(out_file, " %02x", pos[i]);
for (i = llen; i < line_len; i++)
fprintf(out_file, " ");
fprintf(out_file, " ");
for (i = 0; i < llen; i++) {
if (isprint(pos[i]))
fprintf(out_file, "%c", pos[i]);
else
fprintf(out_file, "_");
}
for (i = llen; i < line_len; i++)
fprintf(out_file, " ");
fprintf(out_file, "\n");
pos += llen;
len -= llen;
}
} else {
#endif /* CONFIG_DEBUG_FILE */
if (!show) {
printf("%s - hexdump_ascii(len=%lu): [REMOVED]\n",
title, (unsigned long) len);
return;
}
if (buf == NULL) {
printf("%s - hexdump_ascii(len=%lu): [NULL]\n",
title, (unsigned long) len);
return;
}
printf("%s - hexdump_ascii(len=%lu):\n", title, (unsigned long) len);
while (len) {
llen = len > line_len ? line_len : len;
printf(" ");
for (i = 0; i < llen; i++)
printf(" %02x", pos[i]);
for (i = llen; i < line_len; i++)
printf(" ");
printf(" ");
for (i = 0; i < llen; i++) {
if (isprint(pos[i]))
printf("%c", pos[i]);
else
printf("_");
}
for (i = llen; i < line_len; i++)
printf(" ");
printf("\n");
pos += llen;
len -= llen;
}
#ifdef CONFIG_DEBUG_FILE
}
#endif /* CONFIG_DEBUG_FILE */
#endif /* CONFIG_ANDROID_LOG */
}
void wpa_hexdump_ascii(int level, const char *title, const void *buf,
size_t len)
{
_wpa_hexdump_ascii(level, title, buf, len, 1);
}
void wpa_hexdump_ascii_key(int level, const char *title, const void *buf,
size_t len)
{
_wpa_hexdump_ascii(level, title, buf, len, wpa_debug_show_keys);
}
#ifdef CONFIG_DEBUG_FILE
static char *last_path = NULL;
#endif /* CONFIG_DEBUG_FILE */
int wpa_debug_reopen_file(void)
{
#ifdef CONFIG_DEBUG_FILE
int rv;
if (last_path) {
char *tmp = os_strdup(last_path);
wpa_debug_close_file();
rv = wpa_debug_open_file(tmp);
os_free(tmp);
} else {
wpa_printf(MSG_ERROR, "Last-path was not set, cannot "
"re-open log file.");
rv = -1;
}
return rv;
#else /* CONFIG_DEBUG_FILE */
return 0;
#endif /* CONFIG_DEBUG_FILE */
}
int wpa_debug_open_file(const char *path)
{
#ifdef CONFIG_DEBUG_FILE
if (!path)
return 0;
if (last_path == NULL || os_strcmp(last_path, path) != 0) {
/* Save our path to enable re-open */
os_free(last_path);
last_path = os_strdup(path);
}
out_file = fopen(path, "a");
if (out_file == NULL) {
wpa_printf(MSG_ERROR, "wpa_debug_open_file: Failed to open "
"output file, using standard output");
return -1;
}
#ifndef _WIN32
setvbuf(out_file, NULL, _IOLBF, 0);
#endif /* _WIN32 */
#else /* CONFIG_DEBUG_FILE */
(void)path;
#endif /* CONFIG_DEBUG_FILE */
return 0;
}
void wpa_debug_close_file(void)
{
#ifdef CONFIG_DEBUG_FILE
if (!out_file)
return;
fclose(out_file);
out_file = NULL;
os_free(last_path);
last_path = NULL;
#endif /* CONFIG_DEBUG_FILE */
}
#endif /* CONFIG_NO_STDOUT_DEBUG */
#ifndef CONFIG_NO_WPA_MSG
static wpa_msg_cb_func wpa_msg_cb = NULL;
void wpa_msg_register_cb(wpa_msg_cb_func func)
{
wpa_msg_cb = func;
}
static wpa_msg_get_ifname_func wpa_msg_ifname_cb = NULL;
void wpa_msg_register_ifname_cb(wpa_msg_get_ifname_func func)
{
wpa_msg_ifname_cb = func;
}
void wpa_msg(void *ctx, int level, const char *fmt, ...)
{
va_list ap;
char *buf;
int buflen;
int len;
char prefix[130];
va_start(ap, fmt);
buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
va_end(ap);
buf = os_malloc(buflen);
if (buf == NULL) {
wpa_printf(MSG_ERROR, "wpa_msg: Failed to allocate message "
"buffer");
return;
}
va_start(ap, fmt);
prefix[0] = '\0';
if (wpa_msg_ifname_cb) {
const char *ifname = wpa_msg_ifname_cb(ctx);
if (ifname) {
int res = os_snprintf(prefix, sizeof(prefix), "%s: ",
ifname);
if (os_snprintf_error(sizeof(prefix), res))
prefix[0] = '\0';
}
}
len = vsnprintf(buf, buflen, fmt, ap);
va_end(ap);
wpa_printf(level, "%s%s", prefix, buf);
if (wpa_msg_cb)
wpa_msg_cb(ctx, level, 0, buf, len);
os_free(buf);
}
void wpa_msg_ctrl(void *ctx, int level, const char *fmt, ...)
{
va_list ap;
char *buf;
int buflen;
int len;
if (!wpa_msg_cb)
return;
va_start(ap, fmt);
buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
va_end(ap);
buf = os_malloc(buflen);
if (buf == NULL) {
wpa_printf(MSG_ERROR, "wpa_msg_ctrl: Failed to allocate "
"message buffer");
return;
}
va_start(ap, fmt);
len = vsnprintf(buf, buflen, fmt, ap);
va_end(ap);
wpa_msg_cb(ctx, level, 0, buf, len);
os_free(buf);
}
void wpa_msg_global(void *ctx, int level, const char *fmt, ...)
{
va_list ap;
char *buf;
int buflen;
int len;
va_start(ap, fmt);
buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
va_end(ap);
buf = os_malloc(buflen);
if (buf == NULL) {
wpa_printf(MSG_ERROR, "wpa_msg_global: Failed to allocate "
"message buffer");
return;
}
va_start(ap, fmt);
len = vsnprintf(buf, buflen, fmt, ap);
va_end(ap);
wpa_printf(level, "%s", buf);
if (wpa_msg_cb)
wpa_msg_cb(ctx, level, 1, buf, len);
os_free(buf);
}
void wpa_msg_global_ctrl(void *ctx, int level, const char *fmt, ...)
{
va_list ap;
char *buf;
int buflen;
int len;
if (!wpa_msg_cb)
return;
va_start(ap, fmt);
buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
va_end(ap);
buf = os_malloc(buflen);
if (buf == NULL) {
wpa_printf(MSG_ERROR,
"wpa_msg_global_ctrl: Failed to allocate message buffer");
return;
}
va_start(ap, fmt);
len = vsnprintf(buf, buflen, fmt, ap);
va_end(ap);
wpa_msg_cb(ctx, level, 1, buf, len);
os_free(buf);
}
void wpa_msg_no_global(void *ctx, int level, const char *fmt, ...)
{
va_list ap;
char *buf;
int buflen;
int len;
va_start(ap, fmt);
buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
va_end(ap);
buf = os_malloc(buflen);
if (buf == NULL) {
wpa_printf(MSG_ERROR, "wpa_msg_no_global: Failed to allocate "
"message buffer");
return;
}
va_start(ap, fmt);
len = vsnprintf(buf, buflen, fmt, ap);
va_end(ap);
wpa_printf(level, "%s", buf);
if (wpa_msg_cb)
wpa_msg_cb(ctx, level, 2, buf, len);
os_free(buf);
}
#endif /* CONFIG_NO_WPA_MSG */
#ifndef CONFIG_NO_HOSTAPD_LOGGER
static hostapd_logger_cb_func hostapd_logger_cb = NULL;
void hostapd_logger_register_cb(hostapd_logger_cb_func func)
{
hostapd_logger_cb = func;
}
void hostapd_logger(void *ctx, const u8 *addr, unsigned int module, int level,
const char *fmt, ...)
{
va_list ap;
char *buf;
int buflen;
int len;
va_start(ap, fmt);
buflen = vsnprintf(NULL, 0, fmt, ap) + 1;
va_end(ap);
buf = os_malloc(buflen);
if (buf == NULL) {
wpa_printf(MSG_ERROR, "hostapd_logger: Failed to allocate "
"message buffer");
return;
}
va_start(ap, fmt);
len = vsnprintf(buf, buflen, fmt, ap);
va_end(ap);
if (hostapd_logger_cb)
hostapd_logger_cb(ctx, addr, module, level, buf, len);
else if (addr)
wpa_printf(MSG_DEBUG, "hostapd_logger: STA " MACSTR " - %s",
MAC2STR(addr), buf);
else
wpa_printf(MSG_DEBUG, "hostapd_logger: %s", buf);
os_free(buf);
}
#endif /* CONFIG_NO_HOSTAPD_LOGGER */
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