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client_common.c
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client_common.c
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/*
* UFTP - UDP based FTP with multicast
*
* Copyright (C) 2001-2015 Dennis A. Bush, Jr. bush@tcnj.edu
*
* 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 <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <math.h>
#ifdef WINDOWS
#include <ws2tcpip.h>
#include <io.h>
#include <direct.h>
#include <sys/utime.h>
#include "win_func.h"
#else // if WINDOWS
#include <sys/time.h>
#include <dirent.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <utime.h>
#endif
#include "client.h"
#include "client_common.h"
/**
* Look for a given group in the global group list
* Returns a pointer to the group in the list, or NULL if not found
*/
struct group_list_t *find_group(uint32_t group_id, uint8_t group_inst)
{
int i;
for (i = 0; i < MAXLIST; i++) {
if ((group_list[i].group_id == group_id) &&
(group_list[i].group_inst == group_inst)) {
return &group_list[i];
}
}
return NULL;
}
/**
* Looks for the uid in a list of addresses.
* Returns 1 if found, 0 if not found
*/
int uid_in_list(const uint32_t *addrlist, int size)
{
int i;
for (i = 0; i < size; i++) {
if (addrlist[i] == 0) {
return 0;
}
if (uid == addrlist[i]) {
return 1;
}
}
return 0;
}
/**
* Reads in the contents of the restart file.
*/
void read_restart_file(struct group_list_t *group)
{
struct client_restart_t *restart;
char restart_name[MAXPATHNAME];
int fd, i, rval;
// Don't bother if we're not using a temp directory.
if (!strcmp(tempdir, "")) {
return;
}
// First abort any prior session with the same group_id.
// This creates the restart file.
for (i = 0; i < MAXLIST; i++) {
if ((group_list[i].group_id == group->group_id) &&
(group_list[i].group_inst < group->group_inst)) {
file_cleanup(&group_list[i], 1);
}
}
glog2(group, "Reading restart file");
snprintf(restart_name, sizeof(restart_name), "%s%c_group_%08X_restart",
tempdir, PATH_SEP, group->group_id);
if ((fd = open(restart_name, OPENREAD, 0644)) == -1) {
gsyserror(group, "Failed to read restart file");
return;
}
// Read header
restart = safe_calloc(sizeof(struct client_restart_t), 1);
if ((rval = file_read(fd, restart, sizeof(struct client_restart_t),
0)) == -1) {
glog0(group, "Failed to read header for restart file");
goto err1;
}
if (rval != sizeof(struct client_restart_t)) {
glog0(group, "Failed to read header for restart file "
"(read %d, expected %d)", rval,sizeof(struct client_restart_t));
goto err1;
}
// Read NAK list
if (restart->blocks) {
restart->naklist = safe_calloc(restart->blocks, 1);
if (file_read(fd, restart->naklist, restart->blocks, 0) == -1) {
glog0(group, "Failed to read NAK list for restart file");
goto err2;
}
}
// Read section_done list
if (restart->sections) {
restart->section_done = safe_calloc(restart->sections, 1);
if (file_read(fd, restart->section_done, restart->sections, 0) == -1) {
glog0(group, "Failed to read section_done list for restart file");
goto err3;
}
}
close(fd);
unlink(restart_name);
group->restartinfo = restart;
glog3(group, "Reading restart file done");
return;
err3:
free(restart->section_done);
err2:
free(restart->naklist);
err1:
free(restart);
close(fd);
}
/**
* Save the state of a failed transfer so it can restarted later.
*/
void write_restart_file(struct group_list_t *group)
{
struct file_t *fileinfo;
struct client_restart_t restart;
char restart_name[MAXPATHNAME];
int fd;
// Don't bother if we're not using a temp directory.
if (!strcmp(tempdir, "")) {
return;
}
glog2(group, "Writing restart file");
memset(&restart, 0, sizeof(restart));
fileinfo = &group->fileinfo;
if (group->phase != PHASE_MIDGROUP) {
restart.blocks = fileinfo->blocks;
restart.sections = fileinfo->sections;
restart.size = fileinfo->size;
strncpy(restart.name, fileinfo->name, sizeof(restart.name));
restart.name[sizeof(restart.name)-1] = '\x0';
}
snprintf(restart_name, sizeof(restart_name), "%s%c_group_%08X_restart",
tempdir, PATH_SEP, group->group_id);
if ((fd = open(restart_name, OPENWRITE | O_CREAT | O_TRUNC, 0644)) == -1) {
gsyserror(group, "Failed to create restart file");
return;
}
if (file_write(fd, &restart, sizeof(restart)) == -1) {
glog0(group, "Failed to write header for restart file");
goto errexit;
}
if (fileinfo->blocks && fileinfo->naklist) {
if (file_write(fd, fileinfo->naklist, fileinfo->blocks) == -1) {
glog0(group, "Failed to write NAK list for restart file");
goto errexit;
}
}
if (fileinfo->sections && fileinfo->section_done) {
if (file_write(fd, fileinfo->section_done, fileinfo->sections) == -1) {
glog0(group, "Failed to write section_done list for restart file");
goto errexit;
}
}
close(fd);
return;
errexit:
close(fd);
unlink(restart_name);
}
/**
* Checks to see if the multicast address used for the given group list member
* is also being used by either another member or the public address list
*/
int other_mcast_users(struct group_list_t *group)
{
int i;
for (i = 0; i < pub_multi_count; i++) {
if (!memcmp(&group->multi, &pub_multi[i], sizeof(union sockaddr_u))) {
return 1;
}
}
for (i = 0; i < MAXLIST; i++) {
if ((&group_list[i] != group) && (!memcmp(&group->multi,
&group_list[i].multi, sizeof(union sockaddr_u)))) {
return 1;
}
}
return 0;
}
/**
* Run the postreceive script on list of received files
*/
void run_postreceive_multi(struct group_list_t *group, char *const *files,
int count)
{
char **params;
char gid_str[10];
char gid_param[] = "-I";
int i;
if (!strcmp(postreceive, "")) {
return;
}
params = safe_calloc(count + 4, sizeof(char *));
snprintf(gid_str, sizeof(gid_str), "%08X", group->group_id);
params[0] = postreceive;
params[1] = gid_param;
params[2] = gid_str;
for (i = 0; i < count; i++) {
params[i+3] = files[i];
}
params[count+4-1] = NULL;
if (log_level >= 2) {
cglog2(group, "Running postreceive: %s", postreceive);
for (i = 1; i < count + 3; i++) {
sclog2(" %s", params[i]);
}
slog2("");
}
#ifdef WINDOWS
{
char cmdline[0x8000]; // Windows max command line length
char cmdexe[MAXPATHNAME];
int too_long, rval, is_cmd;
strcpy(cmdline, "");
if ((!strncmp(&postreceive[strlen(postreceive)-4], ".cmd", 4)) ||
(!strncmp(&postreceive[strlen(postreceive)-4], ".bat", 4))) {
is_cmd = 1;
if (!GetEnvironmentVariable("SystemRoot", cmdexe, sizeof(cmdexe))) {
char errbuf[300];
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(),
0, errbuf, sizeof(errbuf), NULL);
glog0(group, "Error getting sysroot: (%d) %s",
GetLastError(), errbuf);
free(params);
return;
}
strcat(cmdexe, "\\system32\\cmd.exe");
strcat(cmdline, "/c \"");
} else {
is_cmd = 0;
}
for (too_long = 0, i = 0; i < count + 3; i++) {
int size = 0x8000 - strlen(cmdline);
if (size <= (int)strlen(params[i]) + 4) {
too_long = 1;
break;
}
// Quote everything except -I {group_id}
if (i == 1 || i == 2) {
strcat(cmdline, params[i]);
strcat(cmdline," ");
} else {
strcat(cmdline, "\"");
strcat(cmdline, params[i]);
strcat(cmdline,"\" ");
}
}
if (is_cmd) {
strcat(cmdline, "\"");
}
if (!too_long) {
STARTUPINFO startup_info;
PROCESS_INFORMATION proc_info;
GetStartupInfo(&startup_info);
rval = CreateProcess(is_cmd ? cmdexe : postreceive, cmdline,
NULL, NULL, 0, CREATE_NO_WINDOW, NULL, NULL,
&startup_info, &proc_info);
if (!rval) {
char errbuf[300];
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(),
0, errbuf, sizeof(errbuf), NULL);
glog0(group, "Error running script: (%d) %s",
GetLastError(), errbuf);
}
}
}
#else
{
pid_t pid;
if ((pid = fork()) == -1) {
gsyserror(group, "fork failed");
} else if (pid == 0) {
close(listener);
close(1);
close(2);
execv(postreceive, params);
gsyserror(group, "exec failed");
exit(1);
}
}
#endif
free(params);
}
/**
* Run the postreceive script on a received file
*/
void run_postreceive(struct group_list_t *group, char *file)
{
char *files[] = { file };
run_postreceive_multi(group, files, 1);
}
/**
* Clean up a group list entry. Close the file if open,
* free malloc'ed structures, drop the multicast group
* (if no one else is using it) and free the slot.
*/
void file_cleanup(struct group_list_t *group, int abort_session)
{
if (group->fileinfo.fd >= 0) {
glog2(group, "starting file close");
close(group->fileinfo.fd);
glog2(group, "done file close");
group->fileinfo.fd = -1;
if (abort_session && !strcmp(tempdir, "")) {
if (tempfile) {
unlink(group->fileinfo.temppath);
} else {
unlink(group->fileinfo.filepath);
}
} else {
if (tempfile) {
move_to_backup(group);
if (rename(group->fileinfo.temppath,
group->fileinfo.filepath) == -1) {
gsyserror(group, "Couldn't rename from %s to %s",
group->fileinfo.temppath,group->fileinfo.filepath);
}
}
if (group->fileinfo.tstamp) {
utim_buf utbuf;
utbuf.actime = group->fileinfo.tstamp;
utbuf.modtime = group->fileinfo.tstamp;
if (utime(group->fileinfo.filepath, &utbuf) == -1) {
gsyserror(group, "utime failed");
}
}
}
}
if (abort_session || (group->file_id == 0)) {
if (!addr_blank(&group->multi) && !other_mcast_users(group) &&
group->multi_join) {
if (server_count > 0) {
multicast_leave(listener, group->group_id, &group->multi,
m_interface, interface_count, server_keys,server_count);
if (has_proxy) {
multicast_leave(listener, group->group_id, &group->multi,
m_interface, interface_count, &proxy_info, 1);
}
} else {
multicast_leave(listener, group->group_id, &group->multi,
m_interface, interface_count, NULL, 0);
}
}
if (group->server_pubkey.key) {
if (group->keyextype == KEYEX_ECDH_ECDSA) {
free_EC_key(group->server_pubkey.ec);
} else {
free_RSA_key(group->server_pubkey.rsa);
}
}
if (group->server_dhkey.key) {
free_EC_key(group->server_dhkey.ec);
free_EC_key(group->client_dhkey.ec);
}
if (group->restartinfo &&
(strcmp(group->restartinfo->name, ""))) {
// We have unused restart info from the last run.
// Chalk this up as a loss and delete the data file
char filepath[MAXPATHNAME];
snprintf(filepath, sizeof(filepath), "%s%c_group_%08X%c%s", tempdir,
PATH_SEP, group->group_id, PATH_SEP,
group->restartinfo->name);
unlink(filepath);
}
if (abort_session) {
write_restart_file(group);
}
free(group->loss_history);
free(group->fileinfo.naklist);
free(group->fileinfo.section_done);
free(group->fileinfo.cache);
free(group->fileinfo.cache_status);
if (group->restartinfo) {
free(group->restartinfo->naklist);
free(group->restartinfo->section_done);
free(group->restartinfo);
}
memset(group, 0, sizeof(struct group_list_t));
} else {
// Don't clear the file_id in case we need to respond to late DONEs
if (!strcmp(tempdir, "")) {
run_postreceive(group, group->fileinfo.filepath);
}
group->phase = PHASE_MIDGROUP;
set_timeout(group, 0);
free(group->fileinfo.naklist);
free(group->fileinfo.section_done);
free(group->fileinfo.cache);
free(group->fileinfo.cache_status);
group->fileinfo.naklist = NULL;
group->fileinfo.section_done = NULL;
group->fileinfo.cache = NULL;
group->fileinfo.cache_status = NULL;
}
}
/**
* Flushes the cache to disk
* Returns 1 on success, 0 on failure
*/
int flush_disk_cache(struct group_list_t *group)
{
f_offset_t offset, seek_rval;
int wrote_len;
uint32_t i;
if (group->fileinfo.cache_len == 0) return 1;
offset = (f_offset_t) group->fileinfo.cache_start * group->blocksize;
if ((seek_rval = lseek_func(group->fileinfo.fd,
offset - group->fileinfo.curr_offset, SEEK_CUR)) == -1) {
gsyserror(group, "lseek failed for file");
}
if (seek_rval != offset) {
glog2(group, "offset is %s", printll(seek_rval));
glog2(group, " should be %s", printll(offset));
if ((seek_rval = lseek_func(group->fileinfo.fd, offset,
SEEK_SET)) == -1) {
gsyserror(group, "lseek failed for file");
return 0;
}
}
if ((wrote_len = write(group->fileinfo.fd, group->fileinfo.cache,
group->fileinfo.cache_len)) == -1) {
gsyserror(group, "Write failed for blocks %d - %d",
group->fileinfo.cache_start, group->fileinfo.cache_end);
return 0;
} else {
group->fileinfo.curr_offset = offset + wrote_len;
if (wrote_len != group->fileinfo.cache_len) {
glog0(group, "Write failed for blocks %d - %d, only wrote %d bytes",
group->fileinfo.cache_start, group->fileinfo.cache_end);
return 0;
} else {
glog4(group, "Wrote blocks %d - %d to disk from cache",
group->fileinfo.cache_start, group->fileinfo.cache_end);
for (i = group->fileinfo.cache_start;
i <= group->fileinfo.cache_end; i++) {
int status_idx = i - group->fileinfo.cache_start;
if (group->fileinfo.cache_status[status_idx]) {
group->fileinfo.naklist[i] = 0;
}
}
group->fileinfo.cache_start = group->fileinfo.cache_end + 1;
while ((group->fileinfo.cache_start < group->fileinfo.blocks) &&
(!group->fileinfo.naklist[group->fileinfo.cache_start])) {
group->fileinfo.cache_start++;
}
group->fileinfo.cache_end = group->fileinfo.cache_start;
group->fileinfo.cache_len = 0;
memset(group->fileinfo.cache, 0, cache_len);
memset(group->fileinfo.cache_status,0,cache_len / group->blocksize);
return 1;
}
}
}
/**
* Initializes the uftp header of an outgoing packet
*/
void set_uftp_header(struct uftp_h *header, int func,
struct group_list_t *group)
{
header->version = group->version;
header->func = func;
header->seq = htons(group->send_seq++);
header->group_id = htonl(group->group_id);
header->group_inst = group->group_inst;
header->src_id = uid;
}
/**
* Sets the timeout time for a given group list member
*/
void set_timeout(struct group_list_t *group, int rescale)
{
if (!rescale) {
gettimeofday(&group->start_timeout_time, NULL);
}
group->timeout_time = group->start_timeout_time;
switch (group->phase) {
case PHASE_REGISTERED:
add_timeval_d(&group->timeout_time, 4 * group->grtt);
break;
case PHASE_RECEIVING:
case PHASE_MIDGROUP:
if (group->robust * group->grtt < 1.0) {
add_timeval_d(&group->timeout_time, 1.0);
} else {
add_timeval_d(&group->timeout_time, group->robust * group->grtt);
}
break;
case PHASE_COMPLETE:
add_timeval_d(&group->timeout_time, 4 * group->grtt);
break;
}
}
/**
* Sends an ABORT message to a server
*/
void send_abort(struct group_list_t *group, const char *message)
{
unsigned char *buf, *encrypted, *outpacket;
struct uftp_h *header;
struct abort_h *abort_hdr;
int payloadlen, enclen;
buf = safe_calloc(MAXMTU, 1);
header = (struct uftp_h *)buf;
abort_hdr = (struct abort_h *)(buf + sizeof(struct uftp_h));
set_uftp_header(header, ABORT, group);
abort_hdr->func = ABORT;
abort_hdr->hlen = sizeof(struct abort_h) / 4;
abort_hdr->host = 0;
strncpy(abort_hdr->message, message, sizeof(abort_hdr->message) - 1);
payloadlen = sizeof(struct abort_h);
if ((group->phase != PHASE_REGISTERED) &&
(group->keytype != KEY_NONE)) {
encrypted = NULL;
if (!encrypt_and_sign(buf, &encrypted, payloadlen, &enclen,
group->keytype, group->groupkey, group->groupsalt,&group->ivctr,
group->ivlen, group->hashtype, group->grouphmackey,
group->hmaclen, group->sigtype, group->keyextype,
group->client_privkey, group->client_privkeylen)) {
glog0(group, "Error encrypting ABORT");
free(buf);
return;
}
outpacket = encrypted;
payloadlen = enclen;
} else {
encrypted = NULL;
outpacket = buf;
}
payloadlen += sizeof(struct uftp_h);
if (nb_sendto(listener, outpacket, payloadlen, 0,
(struct sockaddr *)&group->replyaddr,
family_len(group->replyaddr)) == SOCKET_ERROR) {
gsockerror(group, "Error sending ABORT");
}
flush_disk_cache(group);
file_cleanup(group, 1);
free(buf);
free(encrypted);
}
/**
* Handles an ABORT message from a server
*/
void handle_abort(struct group_list_t *group, const unsigned char *message,
unsigned meslen)
{
const struct abort_h *abort_hdr;
int found;
abort_hdr = (const struct abort_h *)message;
if (meslen < (abort_hdr->hlen * 4U) ||
((abort_hdr->hlen * 4U) < sizeof(struct abort_h))) {
glog1(group, "Rejecting ABORT from server: invalid message size");
return;
}
found = 0;
if (abort_hdr->host == 0) {
if (((abort_hdr->flags & FLAG_CURRENT_FILE) != 0) &&
(group->phase == PHASE_MIDGROUP)) {
found = 0;
} else {
found = 1;
}
} else if (abort_hdr->host == uid) {
found = 1;
}
if (found) {
glog1(group, "Transfer aborted by server: %s", abort_hdr->message);
flush_disk_cache(group);
file_cleanup(group, 1);
}
}
/**
* Sends a KEY_REQ message to the proxy specified as the reply proxy
*/
void send_key_req()
{
unsigned char *packet;
struct uftp_h *header;
struct key_req_h *keyreq;
union sockaddr_u proxyaddr;
char addrname[INET6_ADDRSTRLEN];
int meslen, rval;
packet = safe_calloc(sizeof(struct uftp_h) + sizeof(struct key_req_h), 1);
header = (struct uftp_h *)packet;
keyreq = (struct key_req_h *)(packet + sizeof(struct uftp_h));
header->version = UFTP_VER_NUM;
header->func = KEY_REQ;
header->src_id = uid;
keyreq->func = KEY_REQ;
keyreq->hlen = sizeof(struct key_req_h) / 4;
meslen = sizeof(struct uftp_h) + sizeof(struct key_req_h);
proxyaddr = proxy_info.addr;
if (nb_sendto(listener, packet, meslen, 0,
(struct sockaddr *)&proxyaddr,
family_len(proxyaddr)) == SOCKET_ERROR) {
sockerror(0, 0, 0, "Error sending KEY_REQ");
} else {
if ((rval = getnameinfo((struct sockaddr *)&proxyaddr,
family_len(proxyaddr), addrname, sizeof(addrname),
NULL, 0, NI_NUMERICHOST)) != 0) {
log1(0, 0, 0, "getnameinfo failed: %s", gai_strerror(rval));
}
log2(0, 0, 0, "Sent KEY_REQ to %s:%s", addrname, portname);
}
free(packet);
gettimeofday(&next_keyreq_time, NULL);
next_keyreq_time.tv_sec += KEY_REQ_INT;
}
/**
* Process a PROXY_KEY message
*/
void handle_proxy_key(const union sockaddr_u *src,
unsigned char *message, unsigned meslen)
{
struct proxy_key_h *proxykey;
unsigned char *keyblob, *dhblob, *sig;
unsigned char fingerprint[HMAC_LEN];
unsigned int fplen, keylen, dhlen, siglen;
char addrname[INET6_ADDRSTRLEN];
int rval;
proxykey = (struct proxy_key_h *)message;
if (meslen < (proxykey->hlen * 4U) ||
((proxykey->hlen * 4U) < sizeof(struct proxy_key_h) +
ntohs(proxykey->bloblen) + ntohs(proxykey->dhlen) +
ntohs(proxykey->siglen))) {
log2(0, 0, 0, "Rejecting PROXY_KEY: invalid message size");
return;
}
if ((rval = getnameinfo((const struct sockaddr *)src,
family_len(*src), addrname, sizeof(addrname),
NULL, 0, NI_NUMERICHOST)) != 0) {
log1(0, 0, 0, "getnameinfo failed: %s", gai_strerror(rval));
}
log2(0, 0, 0, "Received PROXY_KEY from %s", addrname);
if (!has_proxy) {
log2(0, 0, 0, "No reply proxy specified");
return;
}
if (!addr_equal(&proxy_info.addr, src)) {
log2(0, 0, 0, "PROXY_KEY not from specified reply proxy");
return;
}
keyblob = (unsigned char *)proxykey + sizeof(struct proxy_key_h);
keylen = ntohs(proxykey->bloblen);
dhblob = keyblob + keylen;
dhlen = ntohs(proxykey->dhlen);
sig = dhblob + dhlen;
siglen = ntohs(proxykey->siglen);
if (keyblob[0] == KEYBLOB_RSA) {
if (!import_RSA_key(&proxy_pubkey.rsa, keyblob, keylen)) {
log0(0, 0, 0, "Failed to import public key from PROXY_KEY");
return;
}
if (proxy_info.has_fingerprint) {
hash(HASH_SHA1, keyblob, keylen, fingerprint, &fplen);
if (memcmp(proxy_info.fingerprint, fingerprint, fplen)) {
log1(0, 0, 0, "Failed to verify PROXY_KEY fingerprint");
free_RSA_key(proxy_pubkey.rsa);
return;
}
}
if (!verify_RSA_sig(proxy_pubkey.rsa, HASH_SHA1,
(unsigned char *)&proxykey->nonce,
sizeof(proxykey->nonce), sig, siglen)) {
log1(0, 0, 0, "Failed to verify PROXY_KEY signature");
free_RSA_key(proxy_pubkey.rsa);
return;
}
} else {
if (!import_EC_key(&proxy_pubkey.ec, keyblob, keylen, 0)) {
log0(0, 0, 0, "Failed to import public key from PROXY_KEY");
return;
}
if (proxy_info.has_fingerprint) {
hash(HASH_SHA1, keyblob, keylen, fingerprint, &fplen);
if (memcmp(proxy_info.fingerprint, fingerprint, fplen)) {
log1(0, 0, 0, "Failed to verify PROXY_KEY fingerprint");
free_RSA_key(proxy_pubkey.rsa);
return;
}
}
if (!verify_ECDSA_sig(proxy_pubkey.ec, HASH_SHA1,
(unsigned char *)&proxykey->nonce,
sizeof(proxykey->nonce), sig, siglen)) {
log1(0, 0, 0, "Failed to verify PROXY_KEY signature");
free_RSA_key(proxy_pubkey.rsa);
return;
}
}
if (dhlen) {
if (!import_EC_key(&proxy_dhkey.ec, dhblob, dhlen, 1)) {
log0(0, 0, 0, "Failed to import ECDH public key from PROXY_KEY");
return;
}
}
}
/**
* Removes a full path from disk
*/
void clear_path(const char *path, struct group_list_t *group)
{
stat_struct statbuf;
char filename[MAXPATHNAME];
int len;
if (lstat_func(path, &statbuf) == -1) {
if (errno != ENOENT) {
gsyserror(group, "Error getting file status for %s", path);
}
return;
}
if (!S_ISDIR(statbuf.st_mode)) {
unlink(path);
} else {
#ifdef WINDOWS
intptr_t ffhandle;
struct _finddatai64_t finfo;
char dirglob[MAXPATHNAME];
snprintf(dirglob, sizeof(dirglob), "%s%c*", path,
PATH_SEP, group->group_id, PATH_SEP);
if ((ffhandle = _findfirsti64(dirglob, &finfo)) == -1) {
gsyserror(group, "Failed to open directory %s", path);
return;
}
do {
len = snprintf(filename, sizeof(filename), "%s%c%s", path,
PATH_SEP, finfo.name);
if ((len >= sizeof(filename)) || (len == -1)) {
glog0(group, "Max pathname length exceeded: %s%c%s",
filename, PATH_SEP, finfo.name);
continue;
}
if (strcmp(finfo.name, ".") && strcmp(finfo.name, "..")) {
clear_path(filename, group);
}
} while (_findnexti64(ffhandle, &finfo) == 0);
_findclose(ffhandle);
#else
DIR *dir;
struct dirent *de;
if ((dir = opendir(path)) == NULL) {
gsyserror(group, "Failed to open directory %s", path);
return;
}
// errno needs to be set to 0 before calling readdir, otherwise
// we'll report a false error when we exhaust the directory
while ((errno = 0, de = readdir(dir)) != NULL) {
len = snprintf(filename, sizeof(filename), "%s%c%s", path, PATH_SEP,
de->d_name);
if ((len >= sizeof(filename)) || (len == -1)) {
glog0(group, "Max pathname length exceeded: %s%c%s",
path, PATH_SEP, de->d_name);
continue;
}
if (strcmp(de->d_name, ".") && strcmp(de->d_name, "..")) {
clear_path(filename, group);
}
}
if (errno && (errno != ENOENT)) {
gsyserror(group, "Failed to read directory %s", path);
}
closedir(dir);
#endif
if (rmdir(path) == -1) {
gsyserror(group, "Failed remove directory %s", path);
}
}
}
/**
* For the current file in a group, move the existing file to
* the appropriate backup directory, if it exists.
* In the event of a failure, delete the original file
*/
void move_to_backup(struct group_list_t *group)
{
stat_struct statbuf;
char backup_file[MAXBACKUPPATHNAME], *trim_name;
int len;
if (lstat_func(group->fileinfo.filepath, &statbuf) == -1) {
return;
}
if (backupcnt == 0) {
clear_path(group->fileinfo.filepath, group);
return;
}
#ifdef WINDOWS
if ((group->fileinfo.filepath[1] == ':') &&
(group->fileinfo.filepath[2] == '\\')) {
trim_name = &group->fileinfo.filepath[3];
} else {
trim_name = group->fileinfo.filepath;
}
#else
trim_name = group->fileinfo.filepath;
#endif
len = snprintf(backup_file, sizeof(backup_file), "%s%c%s%c%s%c%s",
backupdir[group->fileinfo.destdiridx], PATH_SEP,
group->start_date, PATH_SEP,
group->start_time, PATH_SEP, trim_name);
if (len >= sizeof(backup_file)) {
glog0(group, "Max pathname length exceeded for backup file, deleting",
group->fileinfo.filepath);
clear_path(group->fileinfo.filepath, group);
return;
}
clear_path(backup_file, group);
if (!create_path_to_file(group, backup_file)) {
glog0(group, "Error creating path to backup file");
clear_path(group->fileinfo.filepath, group);
}
#ifdef WINDOWS
if (!MoveFile(group->fileinfo.filepath, backup_file)) {
char errbuf[300];
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL,
GetLastError(), 0, errbuf, sizeof(errbuf), NULL);
glog0(group, "Couldn't rename from %s to %s, deleting: (%d): %s",
group->fileinfo.filepath, backup_file, GetLastError(), errbuf);
clear_path(group->fileinfo.filepath, group);
} else {
glog2(group, "Backed up existing file to %s", backup_file);
}
#else
if (rename(group->fileinfo.filepath, backup_file) == -1) {
gsyserror(group, "Couldn't rename from %s to %s, deleting",
group->fileinfo.filepath, backup_file);
clear_path(group->fileinfo.filepath, group);
} else {
glog2(group, "Backed up existing file to %s", backup_file);
}
#endif
}
/**
* Creates all directories in the given file's path, removing existing files.
* Returns 1 on success, 0 on failure
*/
int create_path_to_file(struct group_list_t *group, const char *filename)
{
char *dir, *base;
stat_struct statbuf;
int rval;
split_path(filename, &dir, &base);
if (!dir) {
glog1(group, "Invalid path element %s", filename);
rval = 0;
goto end;
}
#ifdef WINDOWS
if ((base == NULL) || ((strlen(dir) == 2) && (dir[1] == ':'))) {
#else
if ((!strcmp(dir, ".")) || (!strcmp(dir, "/"))) {
#endif
// At top level directory, so stop recursion
rval = 1;
goto end;
}
if (lstat_func(dir, &statbuf) != -1) {
if (!S_ISDIR(statbuf.st_mode)) {
if (unlink(dir) == -1) {
gsyserror(group, "Failed to delete path element %s", dir);
rval = 0;
goto end;
}
if (mkdir(dir, 0755) == -1) {
gsyserror(group, "Failed to create path element %s", dir);
rval = 0;
goto end;
}
}
} else {
// If the file's directory does not exist, recurse first to make sure
// all parent directories exist
if (!create_path_to_file(group, dir)) {