[13199] in bugtraq
Re: Symlinks and Cryogenic Sleep
daemon@ATHENA.MIT.EDU (Goetz Babin-Ebell)
Tue Jan 4 15:04:12 2000
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Message-Id: <3.0.5.32.20000104121119.038a5ea0@mail>
Date: Tue, 4 Jan 2000 12:11:19 +0100
Reply-To: Goetz Babin-Ebell <babinebell@TRUSTCENTER.DE>
From: Goetz Babin-Ebell <babinebell@TRUSTCENTER.DE>
X-To: BUGTRAQ@SECURITYFOCUS.COM
To: BUGTRAQ@SECURITYFOCUS.COM
In-Reply-To: <20000103212443.A5807@monad.swb.de>
At 21:24 03.01.00 +0100, Olaf Kirch wrote:
>Hi all,
Hallo Olaf,
>when you're dealing with files in /tmp that are supposed to be re-opened
>(rather than opened once and then discarded) there's an established
>way to do it which goes like this:
>
> if (lstat(fname, &stb1) >= 0 && S_ISREG(stb1.st_mode)) {
> fd = open(fname, O_RDWR);
> if (fd < 0 || fstat(fd, &stb2) < 0
> || ino_or_dev_mismatch(&stb1, &stb2))
> raise_big_stink()
> } else {
> /* do the O_EXCL thing */
> }
I did something that way:
FILE *DoOpen(const char *cpFile, long bAppend)
{
FILE *spNew;
FILE *spTest;
struct stat sStat;
spTest = fopen(cpFile,"a");
if (!spTest)
{
Log("ERR FILE OPEN",cpFile);
return NULL;
}
if (lstat(cpFile,&sStat))
{
Log("ERR STAT",cpFile);
return NULL;
}
if ((sStat.st_mode & S_IFMT) == S_IFLNK)
{
fclose(spTest);
Log("ERR ISLINK",cpFile);
return NULL;
}
if (bAppend)
spNew = spTest;
else
{
spNew = freopen(cpFile,"w",spTest);
fclose(spTest);
}
if (!spNew)
{
Log("ERR FILE OPEN",cpFile);
return NULL;
}
return spFile;
}
Comments ?
Improvements ?
By
Goetz
--
Goetz Babin-Ebell, TC TrustCenter GmbH, http://www.trustcenter.de
Sonninstr. 24-28, 20097 Hamburg, Germany
Tel.: +49-(0)40 80 80 26 -0, Fax: +49-(0)40 80 80 26 -126
