mirror of
https://git.notmuchmail.org/git/notmuch
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6201491233
maildrop-2.5.5 is GPL-3. No change in functionality, just a precaution before relicensing.
140 lines
1.9 KiB
C
140 lines
1.9 KiB
C
/*
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** Copyright 2000 Double Precision, Inc.
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** See COPYING for distribution information.
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <stdlib.h>
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#include <time.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <stdio.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include "maildirmisc.h"
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char *maildir_getlink(const char *filename)
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{
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#if HAVE_READLINK
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size_t bufsiz;
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char *buf;
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bufsiz=0;
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buf=0;
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for (;;)
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{
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int n;
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if (buf) free(buf);
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bufsiz += 256;
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if ((buf=malloc(bufsiz)) == 0)
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{
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perror("malloc");
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return (0);
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}
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if ((n=readlink(filename, buf, bufsiz)) < 0)
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{
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free(buf);
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return (0);
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}
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if (n < bufsiz)
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{
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buf[n]=0;
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break;
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}
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}
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return (buf);
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#else
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return (0);
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#endif
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}
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int maildir_semisafeopen(const char *path, int mode, int perm)
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{
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#if HAVE_READLINK
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char *l=maildir_getlink(path);
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if (l)
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{
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int f;
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if (*l != '/')
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{
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char *q=malloc(strlen(path)+strlen(l)+2);
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char *s;
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if (!q)
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{
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free(l);
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return (-1);
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}
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strcpy(q, path);
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if ((s=strchr(q, '/')) != 0)
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s[1]=0;
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else *q=0;
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strcat(q, l);
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free(l);
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l=q;
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}
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f=maildir_safeopen(l, mode, perm);
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free(l);
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return (f);
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}
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#endif
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return (maildir_safeopen(path, mode, perm));
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}
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int maildir_safeopen(const char *path, int mode, int perm)
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{
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struct stat stat1;
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return maildir_safeopen_stat(path, mode, perm, &stat1);
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}
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int maildir_safeopen_stat(const char *path, int mode, int perm,
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struct stat *stat1)
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{
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struct stat stat2;
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int fd=open(path, mode
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#ifdef O_NONBLOCK
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| O_NONBLOCK
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#else
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| O_NDELAY
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#endif
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, perm);
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if (fd < 0) return (fd);
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if (fcntl(fd, F_SETFL, (mode & O_APPEND)) || fstat(fd, stat1)
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|| lstat(path, &stat2))
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{
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close(fd);
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return (-1);
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}
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if (stat1->st_dev != stat2.st_dev || stat1->st_ino != stat2.st_ino)
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{
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close(fd);
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errno=ENOENT;
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return (-1);
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}
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return (fd);
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}
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