import libfetch-2.38 from NetBSD

ftp://ftp.fu-berlin.de/unix/NetBSD/packages/current-src/pkgsrc/net/libfetch/files

libfetch comes (at least) in netbsd and freebsd flavors which
differing functionality. Alpine and Arch package netbsd one,
but it's not widely packaged across other distributions.

We need NetBSD version as it does not use funopen(3) which is not
supported in musl, and supports connection pooling.

FreeBSD seems to be the orignal and better maintained version
with support for SSL CAs, client certificate authentication,
proxy authentication, and improved http redirect handling.

So this imports NetBSD version, and future commits will pick up
the needed improvements from FreeBSD tree.

Incidentally, this also fixes #7857 and likes for good.

1 files changed, 265 insertions, 0 deletions

diff --git a/libfetch/file.c b/libfetch/file.c
new file mode 100644
index 0000000..b092fdf
--- /dev/null
+++ b/libfetch/file.c
@@ -0,0 +1,265 @@
+/*	$NetBSD: file.c,v 1.15 2009/10/15 12:36:57 joerg Exp $	*/
+/*-
+ * Copyright (c) 1998-2004 Dag-Erling Coïdan Smørgrav
+ * Copyright (c) 2008, 2009 Joerg Sonnenberger <joerg@NetBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD: file.c,v 1.18 2007/12/14 10:26:58 des Exp $
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+#ifndef NETBSD
+#include <nbcompat.h>
+#endif
+
+#include <sys/stat.h>
+
+#include <dirent.h>
+#include <fcntl.h>
+#include <fnmatch.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "fetch.h"
+#include "common.h"
+
+static int	fetch_stat_file(int, struct url_stat *);
+
+static ssize_t
+fetchFile_read(void *cookie, void *buf, size_t len)
+{
+	return read(*(int *)cookie, buf, len);
+}
+
+static ssize_t
+fetchFile_write(void *cookie, const void *buf, size_t len)
+{
+	return write(*(int *)cookie, buf, len);
+}
+
+static void
+fetchFile_close(void *cookie)
+{
+	int fd = *(int *)cookie;
+
+	free(cookie);
+
+	close(fd);
+}
+
+fetchIO *
+fetchXGetFile(struct url *u, struct url_stat *us, const char *flags)
+{
+	char *path;
+	fetchIO *f;
+	struct url_stat local_us;
+	int if_modified_since, fd, *cookie;
+
+	if_modified_since = CHECK_FLAG('i');
+	if (if_modified_since && us == NULL)
+		us = &local_us;
+
+	if ((path = fetchUnquotePath(u)) == NULL) {
+		fetch_syserr();
+		return NULL;
+	}
+
+	fd = open(path, O_RDONLY);
+	free(path);
+	if (fd == -1) {
+		fetch_syserr();
+		return NULL;
+	}
+
+	if (us && fetch_stat_file(fd, us) == -1) {
+		close(fd);
+		fetch_syserr();
+		return NULL;
+	}
+
+	if (if_modified_since && u->last_modified > 0 &&
+	    u->last_modified >= us->mtime) {
+		close(fd);
+		fetchLastErrCode = FETCH_UNCHANGED;
+		snprintf(fetchLastErrString, MAXERRSTRING, "Unchanged");
+		return NULL;
+	}
+
+	if (u->offset && lseek(fd, u->offset, SEEK_SET) == -1) {
+		close(fd);
+		fetch_syserr();
+		return NULL;
+	}
+
+	cookie = malloc(sizeof(int));
+	if (cookie == NULL) {
+		close(fd);
+		fetch_syserr();
+		return NULL;
+	}
+
+	*cookie = fd;
+	f = fetchIO_unopen(cookie, fetchFile_read, fetchFile_write, fetchFile_close);
+	if (f == NULL) {
+		close(fd);
+		free(cookie);
+	}
+	return f;
+}
+
+fetchIO *
+fetchGetFile(struct url *u, const char *flags)
+{
+	return (fetchXGetFile(u, NULL, flags));
+}
+
+fetchIO *
+fetchPutFile(struct url *u, const char *flags)
+{
+	char *path;
+	fetchIO *f;
+	int fd, *cookie;
+
+	if ((path = fetchUnquotePath(u)) == NULL) {
+		fetch_syserr();
+		return NULL;
+	}
+
+	if (CHECK_FLAG('a'))
+		fd = open(path, O_WRONLY | O_APPEND);
+	else
+		fd = open(path, O_WRONLY);
+
+	free(path);
+
+	if (fd == -1) {
+		fetch_syserr();
+		return NULL;
+	}
+
+	if (u->offset && lseek(fd, u->offset, SEEK_SET) == -1) {
+		close(fd);
+		fetch_syserr();
+		return NULL;
+	}
+
+	cookie = malloc(sizeof(int));
+	if (cookie == NULL) {
+		close(fd);
+		fetch_syserr();
+		return NULL;
+	}
+
+	*cookie = fd;
+	f = fetchIO_unopen(cookie, fetchFile_read, fetchFile_write, fetchFile_close);
+	if (f == NULL) {
+		close(fd);
+		free(cookie);
+	}
+	return f;
+}
+
+static int
+fetch_stat_file(int fd, struct url_stat *us)
+{
+	struct stat sb;
+
+	us->size = -1;
+	us->atime = us->mtime = 0;
+	if (fstat(fd, &sb) == -1) {
+		fetch_syserr();
+		return (-1);
+	}
+	us->size = sb.st_size;
+	us->atime = sb.st_atime;
+	us->mtime = sb.st_mtime;
+	return (0);
+}
+
+int
+fetchStatFile(struct url *u, struct url_stat *us, const char *flags)
+{
+	char *path;
+	int fd, rv;
+
+	if ((path = fetchUnquotePath(u)) == NULL) {
+		fetch_syserr();
+		return -1;
+	}
+
+	fd = open(path, O_RDONLY);
+	free(path);
+
+	if (fd == -1) {
+		fetch_syserr();
+		return -1;
+	}
+
+	rv = fetch_stat_file(fd, us);
+	close(fd);
+
+	return rv;
+}
+
+int
+fetchListFile(struct url_list *ue, struct url *u, const char *pattern, const char *flags)
+{
+	char *path;
+	struct dirent *de;
+	DIR *dir;
+	int ret;
+
+	if ((path = fetchUnquotePath(u)) == NULL) {
+		fetch_syserr();
+		return -1;
+	}
+		
+	dir = opendir(path);
+	free(path);
+
+	if (dir == NULL) {
+		fetch_syserr();
+		return -1;
+	}
+
+	ret = 0;
+
+	while ((de = readdir(dir)) != NULL) {
+		if (pattern && fnmatch(pattern, de->d_name, 0) != 0)
+			continue;
+		ret = fetch_add_entry(ue, u, de->d_name, 0);
+		if (ret)
+			break;
+	}
+
+	closedir(dir);
+
+	return ret;
+}