X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=contrib%2Fnotmuch-deliver%2Fsrc%2Fmaildiropen.c;fp=contrib%2Fnotmuch-deliver%2Fsrc%2Fmaildiropen.c;h=5071df7681ea6c052700337e3ad2ded7acb3ddc2;hp=0000000000000000000000000000000000000000;hb=af863f8c7f1f1571df4f1172ec4e963fa654945e;hpb=6a280088e6769015ade7758b9790384997a21ff3

diff --git a/contrib/notmuch-deliver/src/maildiropen.c b/contrib/notmuch-deliver/src/maildiropen.c
new file mode 100644
index 00000000..5071df76
--- /dev/null
+++ b/contrib/notmuch-deliver/src/maildiropen.c
@@ -0,0 +1,141 @@
+/*
+** 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);
+}