/**
* @param #stattype should be either "link" or "file". If a link, this reads
* readlink and sends it back in the same packet. It then
* caches the value for each copy command.
*
*/
int cf_remote_stat(AgentConnection *conn, bool encrypt, const char *file,
struct stat *statbuf, const char *stattype)
{
assert(strcmp(stattype, "file") == 0 ||
strcmp(stattype, "link") == 0);
/* We encrypt only for CLASSIC protocol. The TLS protocol is always over
* encrypted layer, so it does not support encrypted (S*) commands. */
encrypt = encrypt && conn->conn_info->protocol == CF_PROTOCOL_CLASSIC;
if (strlen(file) > CF_BUFSIZE - 30)
{
Log(LOG_LEVEL_ERR, "Filename too long");
return -1;
}
int ret = StatFromCache(conn, file, statbuf, stattype);
if (ret == 0 || ret == -1) /* found or error */
{
return ret;
}
/* Not found in cache */
char recvbuffer[CF_BUFSIZE];
memset(recvbuffer, 0, CF_BUFSIZE);
time_t tloc = time(NULL);
if (tloc == (time_t) -1)
{
Log(LOG_LEVEL_ERR, "Couldn't read system clock (time: %s)",
GetErrorStr());
tloc = 0;
}
char sendbuffer[CF_BUFSIZE];
int tosend;
sendbuffer[0] = '\0';
if (encrypt)
{
if (conn->session_key == NULL)
{
Log(LOG_LEVEL_ERR,
"Cannot do encrypted copy without keys (use cf-key)");
return -1;
}
char in[CF_BUFSIZE], out[CF_BUFSIZE];
snprintf(in, CF_BUFSIZE - 1, "SYNCH %jd STAT %s",
(intmax_t) tloc, file);
int cipherlen = EncryptString(out, sizeof(out), in, strlen(in) + 1,
conn->encryption_type, conn->session_key);
tosend = cipherlen + CF_PROTO_OFFSET;
if(tosend > sizeof(sendbuffer))
{
ProgrammingError("cf_remote_stat: tosend (%d) > sendbuffer (%ld)",
tosend, sizeof(sendbuffer));
}
snprintf(sendbuffer, CF_BUFSIZE - 1, "SSYNCH %d", cipherlen);
memcpy(sendbuffer + CF_PROTO_OFFSET, out, cipherlen);
}
else
{
snprintf(sendbuffer, CF_BUFSIZE, "SYNCH %jd STAT %s",
(intmax_t) tloc, file);
tosend = strlen(sendbuffer);
}
if (SendTransaction(conn->conn_info, sendbuffer, tosend, CF_DONE) == -1)
{
Log(LOG_LEVEL_INFO,
"Transmission failed/refused talking to %.255s:%.255s. (stat: %s)",
conn->this_server, file, GetErrorStr());
return -1;
}
if (ReceiveTransaction(conn->conn_info, recvbuffer, NULL) == -1)
{
/* TODO mark connection in the cache as closed. */
return -1;
}
if (strstr(recvbuffer, "unsynchronized"))
{
Log(LOG_LEVEL_ERR,
"Clocks differ too much to do copy by date (security), server reported: %s",
recvbuffer + strlen("BAD: "));
return -1;
}
if (BadProtoReply(recvbuffer))
{
Log(LOG_LEVEL_VERBOSE, "Server returned error: %s",
recvbuffer + strlen("BAD: "));
errno = EPERM;
return -1;
}
if (OKProtoReply(recvbuffer))
{
Stat cfst;
// use intmax_t here to provide enough space for large values coming over the protocol
intmax_t d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, d11, d12 = 0, d13 = 0;
ret = sscanf(recvbuffer, "OK: "
"%1" PRIdMAX // 01 cfst.cf_type
" %5" PRIdMAX // 02 cfst.cf_mode
" %14" PRIdMAX // 03 cfst.cf_lmode
" %14" PRIdMAX // 04 cfst.cf_uid
" %14" PRIdMAX // 05 cfst.cf_gid
" %18" PRIdMAX // 06 cfst.cf_size
" %14" PRIdMAX // 07 cfst.cf_atime
" %14" PRIdMAX // 08 cfst.cf_mtime
" %14" PRIdMAX // 09 cfst.cf_ctime
" %1" PRIdMAX // 10 cfst.cf_makeholes
" %14" PRIdMAX // 11 cfst.cf_ino
" %14" PRIdMAX // 12 cfst.cf_nlink
" %18" PRIdMAX, // 13 cfst.cf_dev
&d1, &d2, &d3, &d4, &d5, &d6, &d7, &d8, &d9, &d10, &d11, &d12, &d13);
if (ret < 13)
{
Log(LOG_LEVEL_ERR, "Cannot read SYNCH reply from '%s', only %d/13 items parsed", conn->remoteip, ret );
return -1;
}
cfst.cf_type = (FileType) d1;
cfst.cf_mode = (mode_t) d2;
cfst.cf_lmode = (mode_t) d3;
cfst.cf_uid = (uid_t) d4;
cfst.cf_gid = (gid_t) d5;
cfst.cf_size = (off_t) d6;
cfst.cf_atime = (time_t) d7;
cfst.cf_mtime = (time_t) d8;
cfst.cf_ctime = (time_t) d9;
cfst.cf_makeholes = (char) d10;
cfst.cf_ino = d11;
cfst.cf_nlink = d12;
cfst.cf_dev = (dev_t)d13;
/* Use %?d here to avoid memory overflow attacks */
memset(recvbuffer, 0, CF_BUFSIZE);
if (ReceiveTransaction(conn->conn_info, recvbuffer, NULL) == -1)
{
/* TODO mark connection in the cache as closed. */
return -1;
}
if (strlen(recvbuffer) > 3)
{
cfst.cf_readlink = xstrdup(recvbuffer + 3);
}
else
{
cfst.cf_readlink = NULL;
}
switch (cfst.cf_type)
{
case FILE_TYPE_REGULAR:
cfst.cf_mode |= (mode_t) S_IFREG;
break;
case FILE_TYPE_DIR:
cfst.cf_mode |= (mode_t) S_IFDIR;
break;
case FILE_TYPE_CHAR_:
cfst.cf_mode |= (mode_t) S_IFCHR;
break;
case FILE_TYPE_FIFO:
cfst.cf_mode |= (mode_t) S_IFIFO;
break;
case FILE_TYPE_SOCK:
cfst.cf_mode |= (mode_t) S_IFSOCK;
break;
case FILE_TYPE_BLOCK:
cfst.cf_mode |= (mode_t) S_IFBLK;
break;
case FILE_TYPE_LINK:
cfst.cf_mode |= (mode_t) S_IFLNK;
break;
}
cfst.cf_filename = xstrdup(file);
cfst.cf_server = xstrdup(conn->this_server);
cfst.cf_failed = false;
if (cfst.cf_lmode != 0)
{
cfst.cf_lmode |= (mode_t) S_IFLNK;
}
NewStatCache(&cfst, conn);
if ((cfst.cf_lmode != 0) && (strcmp(stattype, "link") == 0))
{
statbuf->st_mode = cfst.cf_lmode;
}
else
{
statbuf->st_mode = cfst.cf_mode;
}
statbuf->st_uid = cfst.cf_uid;
statbuf->st_gid = cfst.cf_gid;
statbuf->st_size = cfst.cf_size;
statbuf->st_mtime = cfst.cf_mtime;
statbuf->st_ctime = cfst.cf_ctime;
statbuf->st_atime = cfst.cf_atime;
statbuf->st_ino = cfst.cf_ino;
statbuf->st_dev = cfst.cf_dev;
statbuf->st_nlink = cfst.cf_nlink;
return 0;
}
Log(LOG_LEVEL_ERR, "Transmission refused or failed statting '%s', got '%s'", file, recvbuffer);
errno = EPERM;
return -1;
}
int cf_remote_stat(char *file, struct stat *buf, char *stattype, bool encrypt, AgentConnection *conn)
/* If a link, this reads readlink and sends it back in the same
package. It then caches the value for each copy command */
{
char sendbuffer[CF_BUFSIZE];
char recvbuffer[CF_BUFSIZE];
char in[CF_BUFSIZE], out[CF_BUFSIZE];
int ret, tosend, cipherlen;
time_t tloc;
memset(recvbuffer, 0, CF_BUFSIZE);
if (strlen(file) > CF_BUFSIZE - 30)
{
Log(LOG_LEVEL_ERR, "Filename too long");
return -1;
}
ret = CacheStat(file, buf, stattype, conn);
if (ret != 0)
{
return ret;
}
if ((tloc = time((time_t *) NULL)) == -1)
{
Log(LOG_LEVEL_ERR, "Couldn't read system clock");
}
sendbuffer[0] = '\0';
if (encrypt)
{
if (conn->session_key == NULL)
{
Log(LOG_LEVEL_ERR, "Cannot do encrypted copy without keys (use cf-key)");
return -1;
}
snprintf(in, CF_BUFSIZE - 1, "SYNCH %jd STAT %s", (intmax_t) tloc, file);
cipherlen = EncryptString(conn->encryption_type, in, out, conn->session_key, strlen(in) + 1);
snprintf(sendbuffer, CF_BUFSIZE - 1, "SSYNCH %d", cipherlen);
memcpy(sendbuffer + CF_PROTO_OFFSET, out, cipherlen);
tosend = cipherlen + CF_PROTO_OFFSET;
}
else
{
snprintf(sendbuffer, CF_BUFSIZE, "SYNCH %jd STAT %s", (intmax_t) tloc, file);
tosend = strlen(sendbuffer);
}
if (SendTransaction(conn->sd, sendbuffer, tosend, CF_DONE) == -1)
{
Log(LOG_LEVEL_INFO, "Transmission failed/refused talking to %.255s:%.255s. (stat: %s)",
conn->this_server, file, GetErrorStr());
return -1;
}
if (ReceiveTransaction(conn->sd, recvbuffer, NULL) == -1)
{
return -1;
}
if (strstr(recvbuffer, "unsynchronized"))
{
Log(LOG_LEVEL_ERR, "Clocks differ too much to do copy by date (security) '%s'", recvbuffer + 4);
return -1;
}
if (BadProtoReply(recvbuffer))
{
Log(LOG_LEVEL_VERBOSE, "Server returned error '%s'", recvbuffer + 4);
errno = EPERM;
return -1;
}
if (OKProtoReply(recvbuffer))
{
Stat cfst;
// use intmax_t here to provide enough space for large values coming over the protocol
intmax_t d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, d11, d12 = 0, d13 = 0;
ret = sscanf(recvbuffer, "OK: "
"%1" PRIdMAX // 01 cfst.cf_type
" %5" PRIdMAX // 02 cfst.cf_mode
" %14" PRIdMAX // 03 cfst.cf_lmode
" %14" PRIdMAX // 04 cfst.cf_uid
" %14" PRIdMAX // 05 cfst.cf_gid
" %18" PRIdMAX // 06 cfst.cf_size
" %14" PRIdMAX // 07 cfst.cf_atime
" %14" PRIdMAX // 08 cfst.cf_mtime
" %14" PRIdMAX // 09 cfst.cf_ctime
" %1" PRIdMAX // 10 cfst.cf_makeholes
" %14" PRIdMAX // 11 cfst.cf_ino
" %14" PRIdMAX // 12 cfst.cf_nlink
" %18" PRIdMAX, // 13 cfst.cf_dev
&d1, &d2, &d3, &d4, &d5, &d6, &d7, &d8, &d9, &d10, &d11, &d12, &d13);
if (ret < 13)
{
Log(LOG_LEVEL_ERR, "Cannot read SYNCH reply from '%s', only %d/13 items parsed", conn->remoteip, ret );
return -1;
}
cfst.cf_type = (FileType) d1;
cfst.cf_mode = (mode_t) d2;
cfst.cf_lmode = (mode_t) d3;
cfst.cf_uid = (uid_t) d4;
cfst.cf_gid = (gid_t) d5;
cfst.cf_size = (off_t) d6;
cfst.cf_atime = (time_t) d7;
cfst.cf_mtime = (time_t) d8;
cfst.cf_ctime = (time_t) d9;
cfst.cf_makeholes = (char) d10;
cfst.cf_ino = d11;
cfst.cf_nlink = d12;
cfst.cf_dev = (dev_t)d13;
/* Use %?d here to avoid memory overflow attacks */
memset(recvbuffer, 0, CF_BUFSIZE);
if (ReceiveTransaction(conn->sd, recvbuffer, NULL) == -1)
{
return -1;
}
if (strlen(recvbuffer) > 3)
{
cfst.cf_readlink = xstrdup(recvbuffer + 3);
}
else
{
cfst.cf_readlink = NULL;
}
switch (cfst.cf_type)
{
case FILE_TYPE_REGULAR:
cfst.cf_mode |= (mode_t) S_IFREG;
break;
case FILE_TYPE_DIR:
cfst.cf_mode |= (mode_t) S_IFDIR;
break;
case FILE_TYPE_CHAR_:
cfst.cf_mode |= (mode_t) S_IFCHR;
break;
case FILE_TYPE_FIFO:
cfst.cf_mode |= (mode_t) S_IFIFO;
break;
case FILE_TYPE_SOCK:
cfst.cf_mode |= (mode_t) S_IFSOCK;
break;
case FILE_TYPE_BLOCK:
cfst.cf_mode |= (mode_t) S_IFBLK;
break;
case FILE_TYPE_LINK:
cfst.cf_mode |= (mode_t) S_IFLNK;
break;
}
cfst.cf_filename = xstrdup(file);
cfst.cf_server = xstrdup(conn->this_server);
cfst.cf_failed = false;
if (cfst.cf_lmode != 0)
{
cfst.cf_lmode |= (mode_t) S_IFLNK;
}
NewClientCache(&cfst, conn);
if ((cfst.cf_lmode != 0) && (strcmp(stattype, "link") == 0))
{
buf->st_mode = cfst.cf_lmode;
}
else
{
buf->st_mode = cfst.cf_mode;
}
buf->st_uid = cfst.cf_uid;
buf->st_gid = cfst.cf_gid;
buf->st_size = cfst.cf_size;
buf->st_mtime = cfst.cf_mtime;
buf->st_ctime = cfst.cf_ctime;
buf->st_atime = cfst.cf_atime;
buf->st_ino = cfst.cf_ino;
buf->st_dev = cfst.cf_dev;
buf->st_nlink = cfst.cf_nlink;
return 0;
}
Log(LOG_LEVEL_ERR, "Transmission refused or failed statting '%s', got '%s'", file, recvbuffer);
errno = EPERM;
return -1;
}