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client_fileinfo.c
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client_fileinfo.c
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/*
* UFTP - UDP based FTP with multicast
*
* Copyright (C) 2001-2015 Dennis A. Bush, Jr. [email protected]
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Additional permission under GNU GPL version 3 section 7
*
* If you modify this program, or any covered work, by linking or
* combining it with the OpenSSL project's OpenSSL library (or a
* modified version of that library), containing parts covered by the
* terms of the OpenSSL or SSLeay licenses, the copyright holder
* grants you additional permission to convey the resulting work.
* Corresponding Source for a non-source form of such a combination
* shall include the source code for the parts of OpenSSL used as well
* as that of the covered work.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#ifdef WINDOWS
#include <ws2tcpip.h>
#include <io.h>
#include <direct.h>
#include "win_func.h"
#else // if WINDOWS
#include <unistd.h>
#endif
#include "client.h"
#include "client_common.h"
#include "client_fileinfo.h"
#include "client_transfer.h"
/**
* Send a COMPLETE with the given status in response to a FILEINFO,
* set the phase to MIDGROUP, and reset the timeout
*/
void early_complete(struct group_list_t *group, int status, int freespace)
{
group->phase = PHASE_MIDGROUP;
group->fileinfo.comp_status = status;
send_complete(group, freespace);
print_result_status(group);
set_timeout(group, 0);
}
/**
* Read in the contents of a FILEINFO message
* Returns 1 on success, 0 on error or ignore
*/
int read_fileinfo(struct group_list_t *group, const unsigned char *message,
int meslen, struct timeval rxtime)
{
const struct fileinfo_h *fileinfo;
const uint32_t *addrlist;
int listlen, maxsecsize;
const char *name, *flink, *p;
fileinfo = (const struct fileinfo_h *)message;
addrlist = (const uint32_t *)(message + (fileinfo->hlen * 4));
name = (const char *)message + sizeof(struct fileinfo_h);
flink = name + (fileinfo->namelen * 4);
listlen = (meslen - (fileinfo->hlen * 4)) / 4;
if ((meslen < (fileinfo->hlen * 4)) ||
((fileinfo->hlen * 4) < sizeof(struct fileinfo_h)) ||
((fileinfo->namelen * 4) > MAXPATHNAME) ||
((fileinfo->linklen * 4) > MAXPATHNAME) ||
((fileinfo->hlen * 4) != sizeof(struct fileinfo_h) +
(fileinfo->namelen * 4) + (fileinfo->linklen * 4))) {
glog1(group, "Rejecting FILEINFO from server: invalid message size");
send_abort(group, "Rejecting FILEINFO: invalid message size");
return 0;
}
if (!uid_in_list(addrlist, listlen)) {
set_timeout(group, 0);
return 0;
}
if (group->phase == PHASE_RECEIVING) {
// We already got the FILEINFO, so no need to reprocess.
// Just resend the INFO_ACK and reset the timeout
send_fileinfo_ack(group, group->fileinfo.restart);
set_timeout(group, 0);
return 0;
}
if ((group->phase == PHASE_MIDGROUP) &&
(group->file_id == ntohs(fileinfo->file_id))) {
// We already got the FILEINFO, and it's for a completed file.
// So resend the COMPLETE and reset the timeout
send_complete(group, (fileinfo->ftype == FTYPE_FREESPACE));
set_timeout(group, 0);
return 0;
}
// Load fileinfo params into list
memset(&group->fileinfo, 0, sizeof(struct file_t));
group->fileinfo.ftype = fileinfo->ftype;
group->file_id = ntohs(fileinfo->file_id);
strncpy(group->fileinfo.name, name, fileinfo->namelen * 4);
strncpy(group->fileinfo.linkname, flink, fileinfo->linklen * 4);
group->fileinfo.size = (f_offset_t)ntohs(fileinfo->hifsize) << 32;
group->fileinfo.size |= ntohl(fileinfo->lofsize);
if (group->fileinfo.size) {
maxsecsize = (group->blocksize * 8 > MAXSECTION ?
MAXSECTION : group->blocksize * 8);
group->fileinfo.blocks =
(int32_t)((group->fileinfo.size / group->blocksize) +
(group->fileinfo.size % group->blocksize ? 1 : 0));
group->fileinfo.sections = (group->fileinfo.blocks / maxsecsize) +
(group->fileinfo.blocks % maxsecsize ? 1 : 0);
group->fileinfo.secsize_small =
group->fileinfo.blocks / group->fileinfo.sections;
group->fileinfo.secsize_big = group->fileinfo.secsize_small +
(group->fileinfo.blocks % group->fileinfo.sections ? 1 : 0);
group->fileinfo.big_sections = group->fileinfo.blocks -
(group->fileinfo.secsize_small * group->fileinfo.sections);
} else {
group->fileinfo.blocks = 0;
group->fileinfo.sections = 0;
group->fileinfo.secsize_small = 0;
group->fileinfo.secsize_big = 0;
group->fileinfo.big_sections = 0;
}
group->fileinfo.tstamp = ntohl(fileinfo->ftstamp);
group->last_server_ts.tv_sec = ntohl(fileinfo->tstamp_sec);
group->last_server_ts.tv_usec = ntohl(fileinfo->tstamp_usec);
group->last_server_rx_ts = rxtime;
group->fileinfo.fd = -1;
// Run some checks on the filename
if (strlen(group->fileinfo.name) == 0) {
glog1(group, "Rejecting FILEINFO from server: blank file name");
early_complete(group, COMP_STAT_REJECTED, 0);
return 0;
}
p = strstr(group->fileinfo.name, "..");
if ((p != NULL) && ((p[2] == '\x0') || (p[2] == '/') || (p[2] == '\\')) &&
((p == group->fileinfo.name) || (p[-1] == '/') || (p[-1] == '\\'))) {
glog1(group, "Rejecting FILEINFO from server: filename contains ..");
early_complete(group, COMP_STAT_REJECTED, 0);
return 0;
}
if (fileinfo->ftype == FTYPE_LINK) {
if (strlen(group->fileinfo.linkname) == 0) {
glog1(group, "Rejecting FILEINFO from server: blank link name");
early_complete(group, COMP_STAT_REJECTED, 0);
return 0;
}
}
return 1;
}
/**
* Validate and establish the destination name of an incoming file.
* Returns 0 if the file was rejected for some reason, 1 otherwise.
*/
int setup_dest_file(struct group_list_t *group)
{
int found_dest_dir, len, i;
int (*cmp)(const char *, const char *);
int (*ncmp)(const char *, const char *, size_t);
#if PATH_SEP != '/'
// First translate any '/' in the sent file name to PATH_SEP
{
char *p;
while ((p = strchr(group->fileinfo.name, '/')) != NULL) {
*p = PATH_SEP;
}
}
#endif
#ifdef WINDOWS
cmp = stricmp;
ncmp = strnicmp;
#else
cmp = strcmp;
ncmp = strncmp;
#endif
if (isfullpath(group->fileinfo.name)) {
if (strcmp(tempdir, "")) {
glog1(group, "Rejecting file with absolute pathname: "
"temp directory is in use");
early_complete(group, COMP_STAT_REJECTED, 0);
return 0;
}
for (found_dest_dir = 0, i = 0; i < destdircnt; i++) {
if (!ncmp(group->fileinfo.name, destdir[i], strlen(destdir[i]))) {
if (!cmp(group->fileinfo.name, destdir[i])) {
glog1(group, "Rejecting file with absolute pathname: "
"can't have the same name as a dest directory");
early_complete(group, COMP_STAT_REJECTED, 0);
return 0;
} else {
found_dest_dir = 1;
break;
}
}
}
if (!found_dest_dir) {
glog1(group, "Rejecting file with absolute pathname: "
"doesn't match any dest directory");
early_complete(group, COMP_STAT_REJECTED, 0);
return 0;
}
group->fileinfo.destdiridx = i;
snprintf(group->fileinfo.filepath,
sizeof(group->fileinfo.filepath), "%s", group->fileinfo.name);
} else {
if (!strcmp(tempdir, "")) {
len = snprintf(group->fileinfo.filepath,
sizeof(group->fileinfo.filepath), "%s%c%s",
destdir[0], PATH_SEP, group->fileinfo.name);
} else {
len = snprintf(group->fileinfo.filepath,
sizeof(group->fileinfo.filepath),
"%s%c_group_%08X%c%s", tempdir, PATH_SEP, group->group_id,
PATH_SEP, group->fileinfo.name);
}
if (len >= sizeof(group->fileinfo.filepath)) {
glog1(group, "Rejecting file: max pathname length exceeded");
early_complete(group, COMP_STAT_REJECTED, 0);
return 0;
}
}
len = snprintf(group->fileinfo.temppath, sizeof(group->fileinfo.temppath),
"%s.~uftp-%08X-%04X", group->fileinfo.filepath,
group->group_id, group->file_id);
if (len >= sizeof(group->fileinfo.temppath)) {
glog1(group, "Rejecting file: max pathname length exceeded");
early_complete(group, COMP_STAT_REJECTED, 0);
return 0;
}
return 1;
}
/**
* Perform FILEINFO processing specific to a regular file in restart mode
* Returns 1 if a COMPLETE was sent in response, 0 otherwise
*/
int handle_fileinfo_restart(struct group_list_t *group)
{
stat_struct statbuf;
if ((!strcmp(group->fileinfo.name, group->restartinfo->name)) &&
(group->fileinfo.size == group->restartinfo->size) &&
(group->fileinfo.blocks == group->restartinfo->blocks) &&
(group->fileinfo.sections == group->restartinfo->sections)) {
// Flag this file to restart a failed transfer
group->fileinfo.restart = 1;
return 0;
} else if ((lstat_func(group->fileinfo.filepath, &statbuf) != -1) &&
S_ISREG(statbuf.st_mode) &&
(statbuf.st_size == group->fileinfo.size)) {
// This file was finished on the last attempt,
// so respond with a COMPLETE right away
early_complete(group, COMP_STAT_NORMAL, 0);
return 1;
}
return 0;
}
/**
* Perform FILEINFO processing specific to a regular file in sync mode
* Returns 1 if a COMPLETE was sent in response, 0 otherwise
*/
int handle_fileinfo_sync(struct group_list_t *group)
{
stat_struct statbuf;
if (lstat_func(group->fileinfo.filepath, &statbuf) != -1) {
// If source is newer, skip
// If source is older, overwrite
// If timestamps same, skip if sizes are also same
int skip;
if (group->fileinfo.tstamp < statbuf.st_mtime) {
skip = 1;
} else if (group->fileinfo.tstamp > statbuf.st_mtime) {
skip = 0;
} else if (S_ISREG(statbuf.st_mode) &&
(statbuf.st_size == group->fileinfo.size)) {
skip = 1;
} else {
skip = 0;
}
if (skip) {
glog2(group, "skipping file, in sync");
early_complete(group, COMP_STAT_SKIPPED, 0);
return 1;
} else {
glog2(group, "overwriting out of sync file");
group->fileinfo.comp_status = COMP_STAT_OVERWRITE;
if (group->sync_preview) {
glog2(group, "Sync preview mode, skipping receive");
early_complete(group, COMP_STAT_OVERWRITE, 0);
return 1;
}
if (!tempfile) {
move_to_backup(group);
}
}
} else {
glog2(group, "copying new file");
if (group->sync_preview) {
glog2(group, "Sync preview mode, skipping receive");
early_complete(group, COMP_STAT_NORMAL, 0);
return 1;
}
if (!tempfile) {
move_to_backup(group);
}
}
return 0;
}
/**
* Perform FILEINFO processing specific to a regular file
*/
void handle_fileinfo_regular(struct group_list_t *group)
{
// First handle restart or sync mode,
// then create/open the file.
if (group->restartinfo) {
if (handle_fileinfo_restart(group)) {
return;
}
} else if (group->sync_mode) {
if (handle_fileinfo_sync(group)) {
return;
}
}
if (group->fileinfo.restart) {
group->fileinfo.fd = open(group->fileinfo.filepath, OPENWRITE);
} else {
const char *filename;
if (tempfile) {
filename = group->fileinfo.temppath;
} else {
filename = group->fileinfo.filepath;
}
#ifdef WINDOWS
SetFileAttributes(filename, FILE_ATTRIBUTE_NORMAL);
#else
chmod(filename, 0644);
#endif
group->fileinfo.fd = open(filename, OPENWRITE | O_CREAT | O_TRUNC,0644);
}
if (group->fileinfo.fd == -1) {
gsyserror(group, "Error opening data file");
early_complete(group, COMP_STAT_REJECTED, 0);
return;
}
if (group->fileinfo.size > free_space(group->fileinfo.filepath)) {
glog0(group, "Not enough disk space, aborting");
send_abort(group, "Not enough disk space");
return;
}
// Final preparations for receiving a file.
if (group->fileinfo.restart) {
group->fileinfo.naklist = group->restartinfo->naklist;
group->fileinfo.section_done = group->restartinfo->section_done;
group->restartinfo->naklist = NULL;
group->restartinfo->section_done = NULL;
free(group->restartinfo);
group->restartinfo = NULL;
} else {
group->fileinfo.naklist = safe_calloc(group->fileinfo.blocks, 1);
group->fileinfo.section_done = safe_calloc(group->fileinfo.sections, 1);
memset(group->fileinfo.naklist, 1, group->fileinfo.blocks);
}
group->fileinfo.last_block = -1;
group->fileinfo.last_section = 0;
group->fileinfo.curr_offset = 0;
group->fileinfo.cache_start = 0;
group->fileinfo.cache_end = 0;
group->fileinfo.cache_len = 0;
group->fileinfo.cache = safe_calloc(cache_len, 1);
group->fileinfo.cache_status = safe_calloc(cache_len / group->blocksize, 1);
group->phase = PHASE_RECEIVING;
send_fileinfo_ack(group, group->fileinfo.restart);
set_timeout(group, 0);
}
/**
* Perform FILEINFO processing specific to an empty directory
*/
void handle_fileinfo_dir(struct group_list_t *group, int found_dir)
{
if (!found_dir && !group->sync_preview) {
glog2(group, "Creating directory");
if (mkdir(group->fileinfo.filepath, 0755) == -1) {
gsyserror(group, "Failed to create directory %s",
group->fileinfo.filepath);
early_complete(group, COMP_STAT_REJECTED, 0);
return;
}
}
early_complete(group, found_dir ? COMP_STAT_SKIPPED : COMP_STAT_NORMAL, 0);
}
/**
* Perform FILEINFO processing specific to a symbolic link
*/
void handle_fileinfo_link(struct group_list_t *group)
{
#ifndef WINDOWS
if (!group->sync_preview) {
if (symlink(group->fileinfo.linkname, group->fileinfo.filepath) == -1) {
gsyserror(group, "Failed to create symlink %s",
group->fileinfo.filepath);
early_complete(group, COMP_STAT_REJECTED, 0);
return;
}
}
#endif
early_complete(group, COMP_STAT_NORMAL, 0);
}
/**
* Perform FILEINFO processing specific to a delete command
*/
void handle_fileinfo_delete(struct group_list_t *group)
{
if (!group->sync_preview) {
move_to_backup(group);
}
early_complete(group, COMP_STAT_NORMAL, 0);
}
/**
* Perform FILEINFO processing specific to a freespace command
*/
void handle_fileinfo_freespace(struct group_list_t *group)
{
early_complete(group, COMP_STAT_NORMAL, 1);
}
/**
* Process an incoming FILEINFO message.
* Expected in the middle of a group with no current file.
*/
void handle_fileinfo(struct group_list_t *group, const unsigned char *message,
unsigned meslen, struct timeval rxtime)
{
stat_struct statbuf;
int found_dir;
if (!read_fileinfo(group, message, meslen, rxtime)) {
return;
}
glog2(group, "Name of file to receive: %s", group->fileinfo.name);
switch (group->fileinfo.ftype) {
case FTYPE_REG:
glog2(group, "Bytes: %s, Blocks: %d, Sections: %d",
printll(group->fileinfo.size),
group->fileinfo.blocks, group->fileinfo.sections);
glog3(group, "small section size: %d, "
"big section size: %d, # big sections: %d",
group->fileinfo.secsize_small, group->fileinfo.secsize_big,
group->fileinfo.big_sections);
break;
case FTYPE_DIR:
glog2(group, "Empty directory");
break;
case FTYPE_LINK:
glog2(group, "Symbolic link to %s", group->fileinfo.linkname);
break;
case FTYPE_DELETE:
glog2(group, "Deleting file/directory");
break;
case FTYPE_FREESPACE:
glog2(group, "Get free space for path");
break;
default:
glog1(group, "Invalid file type: %d", group->fileinfo.ftype);
send_abort(group, "Invalid file type");
return;
}
if (!setup_dest_file(group)) {
// A rejected file is still a success because we responded with a
// COMPLETE with status=rejected instead of with an ABORT
return;
}
// Make sure the path to the destination file exists and
// remove or back up any existing file
if (!create_path_to_file(group, group->fileinfo.filepath)) {
glog0(group, "Error creating path to data file");
early_complete(group, COMP_STAT_REJECTED, 0);
return;
}
found_dir = 0;
if (tempfile && !group->sync_preview) {
clear_path(group->fileinfo.temppath, group);
}
if ((group->fileinfo.ftype != FTYPE_DELETE) ||
(group->fileinfo.ftype != FTYPE_FREESPACE)) {
// Don't do path checks for metafile commands
} else if (lstat_func(group->fileinfo.filepath, &statbuf) != -1) {
glog3(group, "checking existing file");
if ((group->fileinfo.ftype != FTYPE_DIR) || !S_ISDIR(statbuf.st_mode)) {
if ((group->fileinfo.ftype != FTYPE_REG) ||
!S_ISREG(statbuf.st_mode) ||
((!group->restart) && (!group->sync_mode))) {
// Don't clear/backup if we're receiving a regular file
// and we're in either restart mode or sync mode
glog3(group, "calling move_to_backup");
if (!tempfile) {
move_to_backup(group);
}
}
} else {
glog3(group, "found dir");
found_dir = 1;
}
} else if (errno != ENOENT) {
gsyserror(group, "Error checking file %s",group->fileinfo.filepath);
}
switch (group->fileinfo.ftype) {
case FTYPE_REG:
handle_fileinfo_regular(group);
break;
case FTYPE_DIR:
handle_fileinfo_dir(group, found_dir);
break;
case FTYPE_LINK:
handle_fileinfo_link(group);
break;
case FTYPE_DELETE:
handle_fileinfo_delete(group);
break;
case FTYPE_FREESPACE:
handle_fileinfo_freespace(group);
break;
default:
glog0(group, "Error handling FILEINFO: shouldn't get here!");
}
}