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#ifndef PAM_MACROS_H
#define PAM_MACROS_H
/*
* All kind of macros used by PAM, but usable in some other
* programs too.
* Organized by Cristian Gafton <gafton@redhat.com>
*/
/* a 'safe' version of strdup */
#include <stdlib.h>
#include <string.h>
#define x_strdup(s) ( (s) ? strdup(s):NULL )
/* Good policy to strike out passwords with some characters not just
free the memory */
#define _pam_overwrite(x) \
do { \
register char *__xx__; \
if ((__xx__=(x))) \
while (*__xx__) \
*__xx__++ = '\0'; \
} while (0)
#define _pam_overwrite_n(x,n) \
do { \
register char *__xx__; \
register unsigned int __i__ = 0; \
if ((__xx__=(x))) \
for (;__i__<n; __i__++) \
__xx__[__i__] = 0; \
} while (0)
/*
* Don't just free it, forget it too.
*/
#define _pam_drop(X) \
do { \
if (X) { \
free(X); \
X=NULL; \
} \
} while (0)
#define _pam_drop_reply(/* struct pam_response * */ reply, /* int */ replies) \
do { \
int reply_i; \
\
for (reply_i=0; reply_i<replies; ++reply_i) { \
if (reply[reply_i].resp) { \
_pam_overwrite(reply[reply_i].resp); \
free(reply[reply_i].resp); \
} \
} \
if (reply) \
free(reply); \
} while (0)
/* some debugging code */
#ifdef PAM_DEBUG
/*
* This provides the necessary function to do debugging in PAM.
* Cristian Gafton <gafton@redhat.com>
*/
#include <stdio.h>
#include <sys/types.h>
#include <stdarg.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
/*
* This is for debugging purposes ONLY. DO NOT use on live systems !!!
* You have been warned :-) - CG
*
* to get automated debugging to the log file, it must be created manually.
* _PAM_LOGFILE must exist and be writable to the programs you debug.
*/
#ifndef _PAM_LOGFILE
#define _PAM_LOGFILE "/var/run/pam-debug.log"
#endif
static void _pam_output_debug_info(const char *file, const char *fn
, const int line)
{
FILE *logfile;
int must_close = 1, fd;
#ifdef O_NOFOLLOW
if ((fd = open(_PAM_LOGFILE, O_WRONLY|O_NOFOLLOW|O_APPEND)) != -1) {
#else
if ((fd = open(_PAM_LOGFILE, O_WRONLY|O_APPEND)) != -1) {
#endif
if (!(logfile = fdopen(fd,"a"))) {
logfile = stderr;
must_close = 0;
close(fd);
}
} else {
logfile = stderr;
must_close = 0;
}
fprintf(logfile,"[%s:%s(%d)] ",file, fn, line);
fflush(logfile);
if (must_close)
fclose(logfile);
}
static void _pam_output_debug(const char *format, ...)
{
va_list args;
FILE *logfile;
int must_close = 1, fd;
va_start(args, format);
#ifdef O_NOFOLLOW
if ((fd = open(_PAM_LOGFILE, O_WRONLY|O_NOFOLLOW|O_APPEND)) != -1) {
#else
if ((fd = open(_PAM_LOGFILE, O_WRONLY|O_APPEND)) != -1) {
#endif
if (!(logfile = fdopen(fd,"a"))) {
logfile = stderr;
must_close = 0;
close(fd);
}
} else {
logfile = stderr;
must_close = 0;
}
vfprintf(logfile, format, args);
fprintf(logfile, "\n");
fflush(logfile);
if (must_close)
fclose(logfile);
va_end(args);
}
#define D(x) do { \
_pam_output_debug_info(__FILE__, __FUNCTION__, __LINE__); \
_pam_output_debug x ; \
} while (0)
#define _pam_show_mem(X,XS) do { \
int i; \
register unsigned char *x; \
x = (unsigned char *)X; \
fprintf(stderr, " <start at %p>\n", X); \
for (i = 0; i < XS ; ++x, ++i) { \
fprintf(stderr, " %02X. <%p:%02X>\n", i, x, *x); \
} \
fprintf(stderr, " <end for %p after %d bytes>\n", X, XS); \
} while (0)
#define _pam_show_reply(/* struct pam_response * */reply, /* int */replies) \
do { \
int reply_i; \
setbuf(stderr, NULL); \
fprintf(stderr, "array at %p of size %d\n",reply,replies); \
fflush(stderr); \
if (reply) { \
for (reply_i = 0; reply_i < replies; reply_i++) { \
fprintf(stderr, " elem# %d at %p: resp = %p, retcode = %d\n", \
reply_i, reply+reply_i, reply[reply_i].resp, \
reply[reply_i].resp, _retcode); \
fflush(stderr); \
if (reply[reply_i].resp) { \
fprintf(stderr, " resp[%d] = '%s'\n", \
strlen(reply[reply_i].resp), reply[reply_i].resp); \
fflush(stderr); \
} \
} \
} \
fprintf(stderr, "done here\n"); \
fflush(stderr); \
} while (0)
#else
#define D(x) do { } while (0)
#define _pam_show_mem(X,XS) do { } while (0)
#define _pam_show_reply(reply, replies) do { } while (0)
#endif /* PAM_DEBUG */
#endif /* PAM_MACROS_H */