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/*
* $Source$
* $Author$
*
* This part of the Kerberos V5 software is derived from public-domain code
* contributed by Daniel J. Bernstein, <brnstnd@acf10.nyu.edu>.
*
* XXX correct notice?
* This portion of the software may be freely distributed; this permission
* shall not be construed to apply to any other portion of the software.
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_rc_io_c[] =
"$Id$";
#endif /* !lint & !SABER */
/*
* I/O functions for the replay cache default implementation.
*/
#define KRB5_RC_VNO 0x0501 /* krb5, rcache v 1 */
#include <stdio.h> /* for P_tmpdir */
#include "rc_base.h"
#include "rc_dfl.h"
#include "rc_io.h"
#include <krb5/sysincl.h>
#include <netinet/in.h> /* XXX ip only? */
extern int errno; /* this should be in errno.h, but isn't on some systems */
#define FREE(x) ((void) free((char *) (x)))
#define UNIQUE getpid() /* hopefully unique number */
int dirlen = 0;
char *dir;
/* The do ... while(0) is required to insure that GETDIR looks like a
single statement in all situations (just {}'s may cause troubles in
certain situations, such as nested if/else clauses. */
#define GETDIR do { if (!dirlen) getdir(); } while(0)
static void getdir()
{
if (!dirlen)
{
if (!(dir = getenv("KRB5RCACHEDIR")))
if (!(dir = getenv("TMPDIR")))
#ifdef RCTMPDIR
dir = RCTMPDIR;
#else
dir = "/tmp";
#endif
dirlen = strlen(dir) + 1;
}
}
krb5_error_code krb5_rc_io_creat (d, fn)
krb5_rc_iostuff *d;
char **fn;
{
char *c;
krb5_int16 rc_vno = htons(KRB5_RC_VNO);
krb5_error_code retval;
GETDIR;
if (fn && *fn)
{
if (!(d->fn = malloc(strlen(*fn) + dirlen + 1)))
return KRB5_RC_IO_MALLOC;
(void) strcpy(d->fn,dir);
(void) strcat(d->fn,"/");
(void) strcat(d->fn,*fn);
d->fd = open(d->fn,O_WRONLY | O_CREAT | O_TRUNC | O_EXCL,0600);
}
else
{
/* %d is max 11 digits (-, 10 digits of 32-bit number)
11 + /krb5_RC + aaa = 24, +6 for slop */
if (!(d->fn = malloc(30 + dirlen)))
return KRB5_RC_IO_MALLOC;
if (fn)
if (!(*fn = malloc(35)))
{ FREE(d->fn); return KRB5_RC_IO_MALLOC; }
(void) sprintf(d->fn,"%s/krb5_RC%d",dir,UNIQUE);
c = d->fn + strlen(d->fn);
(void) strcpy(c,"aaa");
while ((d->fd = open(d->fn,O_WRONLY|O_CREAT|O_TRUNC|O_EXCL,0600)) == -1)
{
if ((c[2]++) == 'z')
{
c[2] = 'a';
if ((c[1]++) == 'z')
{
c[1] = 'a';
if ((c[0]++) == 'z')
break; /* sigh */
}
}
}
if (fn)
(void) strcpy(*fn,d->fn + dirlen);
}
if (d->fd == -1)
switch(errno)
{
case EBADF: FREE(d->fn); return KRB5_RC_IO_UNKNOWN; break;
case EFBIG: FREE(d->fn); return KRB5_RC_IO_SPACE; break;
#ifdef EDQUOT
case EDQUOT: FREE(d->fn); return KRB5_RC_IO_SPACE; break;
#endif
case ENOSPC: FREE(d->fn); return KRB5_RC_IO_SPACE; break;
case EIO: FREE(d->fn); return KRB5_RC_IO_IO; break;
case EPERM: FREE(d->fn); return KRB5_RC_IO_PERM; break;
case EACCES: FREE(d->fn); return KRB5_RC_IO_PERM; break;
case EROFS: FREE(d->fn); return KRB5_RC_IO_PERM; break;
case EEXIST: FREE(d->fn); return KRB5_RC_IO_PERM; break;
default: FREE(d->fn); return KRB5_RC_IO_UNKNOWN; break;
}
if (retval = krb5_rc_io_write(d, (krb5_pointer)&rc_vno, sizeof(rc_vno))) {
(void) unlink(d->fn);
FREE(d->fn);
(void) close(d->fd);
return retval;
}
return 0;
}
krb5_error_code krb5_rc_io_open (d, fn)
krb5_rc_iostuff *d;
char *fn;
{
krb5_int16 rc_vno;
krb5_error_code retval;
struct stat statb;
GETDIR;
if (!(d->fn = malloc(strlen(fn) + dirlen + 1)))
return KRB5_RC_IO_MALLOC;
(void) strcpy(d->fn,dir);
(void) strcat(d->fn,"/");
(void) strcat(d->fn,fn);
if ((d->fd = stat(d->fn, &statb)) != -1) {
uid_t me;
me = getuid();
/* must be owned by this user, to prevent some security problems with
other users modifying replay cache stufff */
if ((statb.st_uid != me) || ((statb.st_mode & S_IFMT) != S_IFREG)) {
FREE(d->fn);
return KRB5_RC_IO_PERM;
}
d->fd = open(d->fn,O_RDWR,0600);
}
if (d->fd == -1) {
switch(errno)
{
case EBADF: FREE(d->fn); return KRB5_RC_IO_UNKNOWN; break;
case EFBIG: FREE(d->fn); return KRB5_RC_IO_SPACE; break;
#ifdef EDQUOT
case EDQUOT: FREE(d->fn); return KRB5_RC_IO_SPACE; break;
#endif
case ENOSPC: FREE(d->fn); return KRB5_RC_IO_SPACE; break;
case EIO: FREE(d->fn); return KRB5_RC_IO_IO; break;
case EPERM: FREE(d->fn); return KRB5_RC_IO_PERM; break;
case EACCES: FREE(d->fn); return KRB5_RC_IO_PERM; break;
case EROFS: FREE(d->fn); return KRB5_RC_IO_PERM; break;
default: FREE(d->fn); return KRB5_RC_IO_UNKNOWN; break;
}
}
if (retval = krb5_rc_io_read(d, (krb5_pointer) &rc_vno, sizeof(rc_vno))) {
(void) close(d->fd);
FREE(d->fn);
return retval;
}
if (ntohs(rc_vno) != KRB5_RC_VNO) {
(void) close(d->fd);
FREE(d->fn);
return KRB5_RCACHE_BADVNO;
}
return 0;
}
krb5_error_code krb5_rc_io_move (new, old)
krb5_rc_iostuff *new;
krb5_rc_iostuff *old;
{
if (rename(old->fn,new->fn) == -1) /* MUST be atomic! */
return KRB5_RC_IO_UNKNOWN;
(void) krb5_rc_io_close(new);
new->fn = old->fn;
new->fd = old->fd;
return 0;
}
krb5_error_code krb5_rc_io_write (d, buf, num)
krb5_rc_iostuff *d;
krb5_pointer buf;
int num;
{
if (write(d->fd,(char *) buf,num) == -1)
switch(errno)
{
case EBADF: return KRB5_RC_IO_UNKNOWN; break;
case EFBIG: return KRB5_RC_IO_SPACE; break;
#ifdef EDQUOT
case EDQUOT: return KRB5_RC_IO_SPACE; break;
#endif
case ENOSPC: return KRB5_RC_IO_SPACE; break;
case EIO: return KRB5_RC_IO_IO; break;
default: return KRB5_RC_IO_UNKNOWN; break;
}
if (fsync(d->fd) == -1)
switch(errno)
{
case EBADF: return KRB5_RC_IO_UNKNOWN; break;
case EIO: return KRB5_RC_IO_IO; break;
default: return KRB5_RC_IO_UNKNOWN; break;
}
return 0;
}
krb5_error_code krb5_rc_io_read (d, buf, num)
krb5_rc_iostuff *d;
krb5_pointer buf;
int num;
{
int count;
if ((count = read(d->fd,(char *) buf,num)) == -1)
switch(errno)
{
case EBADF: return KRB5_RC_IO_UNKNOWN; break;
case EIO: return KRB5_RC_IO_IO; break;
default: return KRB5_RC_IO_UNKNOWN; break;
}
if (count == 0)
return KRB5_RC_IO_EOF;
return 0;
}
krb5_error_code krb5_rc_io_close (d)
krb5_rc_iostuff *d;
{
FREE(d->fn);
if (close(d->fd) == -1) /* can't happen */
return KRB5_RC_IO_UNKNOWN;
return 0;
}
krb5_error_code krb5_rc_io_destroy (d)
krb5_rc_iostuff *d;
{
if (unlink(d->fn) == -1)
switch(errno)
{
case EBADF: return KRB5_RC_IO_UNKNOWN; break;
case EIO: return KRB5_RC_IO_IO; break;
case EPERM: return KRB5_RC_IO_PERM; break;
case EBUSY: return KRB5_RC_IO_PERM; break;
case EROFS: return KRB5_RC_IO_PERM; break;
default: return KRB5_RC_IO_UNKNOWN; break;
}
return 0;
}
krb5_error_code krb5_rc_io_mark (d)
krb5_rc_iostuff *d;
{
d->mark = lseek(d->fd,0,L_INCR); /* can't fail */
return 0;
}
krb5_error_code krb5_rc_io_unmark (d)
krb5_rc_iostuff *d;
{
(void) lseek(d->fd,d->mark,L_SET); /* if it fails, tough luck */
return 0;
}
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