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lib: rework vty_use_backup_config()

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Like config_write(), this should use rename(), even though atomicity is
not a real issue here.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
This commit is contained in:
David Lamparter 2017-02-10 15:04:40 +01:00
parent 148781210f
commit 6de469061b
1 changed files with 18 additions and 32 deletions
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50
lib/vty.c
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@ -2357,7 +2357,6 @@ vty_use_backup_config (char *fullpath)
{ {
char *fullpath_sav, *fullpath_tmp; char *fullpath_sav, *fullpath_tmp;
FILE *ret = NULL; FILE *ret = NULL;
struct stat buf;
int tmp, sav; int tmp, sav;
int c; int c;
char buffer[512]; char buffer[512];
@ -2365,7 +2364,9 @@ vty_use_backup_config (char *fullpath)
fullpath_sav = malloc (strlen (fullpath) + strlen (CONF_BACKUP_EXT) + 1); fullpath_sav = malloc (strlen (fullpath) + strlen (CONF_BACKUP_EXT) + 1);
strcpy (fullpath_sav, fullpath); strcpy (fullpath_sav, fullpath);
strcat (fullpath_sav, CONF_BACKUP_EXT); strcat (fullpath_sav, CONF_BACKUP_EXT);
if (stat (fullpath_sav, &buf) == -1)
sav = open (fullpath_sav, O_RDONLY);
if (sav < 0)
{ {
free (fullpath_sav); free (fullpath_sav);
return NULL; return NULL;
@ -2377,47 +2378,32 @@ vty_use_backup_config (char *fullpath)
/* Open file to configuration write. */ /* Open file to configuration write. */
tmp = mkstemp (fullpath_tmp); tmp = mkstemp (fullpath_tmp);
if (tmp < 0) if (tmp < 0)
{ goto out_close_sav;
free (fullpath_sav);
free (fullpath_tmp);
return NULL;
}
sav = open (fullpath_sav, O_RDONLY); if (fchmod (tmp, CONFIGFILE_MASK) != 0)
if (sav < 0) goto out_close;
{
unlink (fullpath_tmp);
free (fullpath_sav);
free (fullpath_tmp);
return NULL;
}
while((c = read (sav, buffer, 512)) > 0) while((c = read (sav, buffer, 512)) > 0)
{ {
if (write (tmp, buffer, c) <= 0) if (write (tmp, buffer, c) <= 0)
{ goto out_close;
free (fullpath_sav);
free (fullpath_tmp);
close (sav);
close (tmp);
return NULL;
}
} }
close (sav); close (sav);
close (tmp); close (tmp);
if (chmod(fullpath_tmp, CONFIGFILE_MASK) != 0) if (rename (fullpath_tmp, fullpath) == 0)
{
unlink (fullpath_tmp);
free (fullpath_sav);
free (fullpath_tmp);
return NULL;
}
if (link (fullpath_tmp, fullpath) == 0)
ret = fopen (fullpath, "r"); ret = fopen (fullpath, "r");
else
unlink (fullpath_tmp);
unlink (fullpath_tmp); if (0)
{
out_close:
close (tmp);
unlink (fullpath_tmp);
out_close_sav:
close (sav);
}
free (fullpath_sav); free (fullpath_sav);
free (fullpath_tmp); free (fullpath_tmp);