mirror of
https://git.notmuchmail.org/git/notmuch
synced 2024-12-24 18:34:52 +01:00
141 lines
2 KiB
C
141 lines
2 KiB
C
/*
|
|
** Copyright 2000 Double Precision, Inc.
|
|
** See COPYING for distribution information.
|
|
*/
|
|
|
|
#if HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <time.h>
|
|
#if HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
|
|
#include "maildirmisc.h"
|
|
|
|
static const char rcsid[]="$Id: maildiropen.c,v 1.8 2003/01/19 16:39:52 mrsam Exp $";
|
|
|
|
char *maildir_getlink(const char *filename)
|
|
{
|
|
#if HAVE_READLINK
|
|
size_t bufsiz;
|
|
char *buf;
|
|
|
|
bufsiz=0;
|
|
buf=0;
|
|
|
|
for (;;)
|
|
{
|
|
int n;
|
|
|
|
if (buf) free(buf);
|
|
bufsiz += 256;
|
|
if ((buf=malloc(bufsiz)) == 0)
|
|
{
|
|
perror("malloc");
|
|
return (0);
|
|
}
|
|
if ((n=readlink(filename, buf, bufsiz)) < 0)
|
|
{
|
|
free(buf);
|
|
return (0);
|
|
}
|
|
if (n < bufsiz)
|
|
{
|
|
buf[n]=0;
|
|
break;
|
|
}
|
|
}
|
|
return (buf);
|
|
#else
|
|
return (0);
|
|
#endif
|
|
}
|
|
|
|
int maildir_semisafeopen(const char *path, int mode, int perm)
|
|
{
|
|
|
|
#if HAVE_READLINK
|
|
|
|
char *l=maildir_getlink(path);
|
|
|
|
if (l)
|
|
{
|
|
int f;
|
|
|
|
if (*l != '/')
|
|
{
|
|
char *q=malloc(strlen(path)+strlen(l)+2);
|
|
char *s;
|
|
|
|
if (!q)
|
|
{
|
|
free(l);
|
|
return (-1);
|
|
}
|
|
|
|
strcpy(q, path);
|
|
if ((s=strchr(q, '/')) != 0)
|
|
s[1]=0;
|
|
else *q=0;
|
|
strcat(q, l);
|
|
free(l);
|
|
l=q;
|
|
}
|
|
|
|
f=maildir_safeopen(l, mode, perm);
|
|
|
|
free(l);
|
|
return (f);
|
|
}
|
|
#endif
|
|
|
|
return (maildir_safeopen(path, mode, perm));
|
|
}
|
|
|
|
int maildir_safeopen(const char *path, int mode, int perm)
|
|
{
|
|
struct stat stat1;
|
|
|
|
return maildir_safeopen_stat(path, mode, perm, &stat1);
|
|
}
|
|
|
|
int maildir_safeopen_stat(const char *path, int mode, int perm,
|
|
struct stat *stat1)
|
|
{
|
|
struct stat stat2;
|
|
|
|
int fd=open(path, mode
|
|
#ifdef O_NONBLOCK
|
|
| O_NONBLOCK
|
|
#else
|
|
| O_NDELAY
|
|
#endif
|
|
, perm);
|
|
|
|
if (fd < 0) return (fd);
|
|
if (fcntl(fd, F_SETFL, (mode & O_APPEND)) || fstat(fd, stat1)
|
|
|| lstat(path, &stat2))
|
|
{
|
|
close(fd);
|
|
return (-1);
|
|
}
|
|
|
|
if (stat1->st_dev != stat2.st_dev || stat1->st_ino != stat2.st_ino)
|
|
{
|
|
close(fd);
|
|
errno=ENOENT;
|
|
return (-1);
|
|
}
|
|
|
|
return (fd);
|
|
}
|