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73af7bcd61
curl/lib/smb.c
Daniel Stenberg 73af7bcd61
smb_getsock: always wait for write socket too 
... the protocol is doing read/write a lot, so it needs to write often
even when downloading. A more proper fix could check for eactly when it
wants to write and only ask for it then.

Without this fix, an SMB download could easily get stuck when the event-driven
API was used.

Closes #2768
2018-07-20 22:53:06 +02:00

995 lines
28 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2014, Bill Nagel <wnagel@tycoint.com>, Exacq Technologies
* Copyright (C) 2016-2018, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "curl_setup.h"
#if !defined(CURL_DISABLE_SMB) && defined(USE_NTLM) && \
(CURL_SIZEOF_CURL_OFF_T > 4)
#if !defined(USE_WINDOWS_SSPI) || defined(USE_WIN32_CRYPTO)
#define BUILDING_CURL_SMB_C
#ifdef HAVE_PROCESS_H
#include <process.h>
#ifdef CURL_WINDOWS_APP
#define getpid GetCurrentProcessId
#elif !defined(MSDOS)
#define getpid _getpid
#endif
#endif
#include "smb.h"
#include "urldata.h"
#include "sendf.h"
#include "multiif.h"
#include "connect.h"
#include "progress.h"
#include "transfer.h"
#include "vtls/vtls.h"
#include "curl_ntlm_core.h"
#include "escape.h"
#include "curl_endian.h"
/* The last #include files should be: */
#include "curl_memory.h"
#include "memdebug.h"
/* Local API functions */
static CURLcode smb_setup_connection(struct connectdata *conn);
static CURLcode smb_connect(struct connectdata *conn, bool *done);
static CURLcode smb_connection_state(struct connectdata *conn, bool *done);
static CURLcode smb_request_state(struct connectdata *conn, bool *done);
static CURLcode smb_done(struct connectdata *conn, CURLcode status,
bool premature);
static CURLcode smb_disconnect(struct connectdata *conn, bool dead);
static int smb_getsock(struct connectdata *conn, curl_socket_t *socks,
int numsocks);
static CURLcode smb_parse_url_path(struct connectdata *conn);
/*
* SMB handler interface
*/
const struct Curl_handler Curl_handler_smb = {
"SMB", /* scheme */
smb_setup_connection, /* setup_connection */
ZERO_NULL, /* do_it */
smb_done, /* done */
ZERO_NULL, /* do_more */
smb_connect, /* connect_it */
smb_connection_state, /* connecting */
smb_request_state, /* doing */
smb_getsock, /* proto_getsock */
smb_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
smb_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
PORT_SMB, /* defport */
CURLPROTO_SMB, /* protocol */
PROTOPT_NONE /* flags */
};
#ifdef USE_SSL
/*
* SMBS handler interface
*/
const struct Curl_handler Curl_handler_smbs = {
"SMBS", /* scheme */
smb_setup_connection, /* setup_connection */
ZERO_NULL, /* do_it */
smb_done, /* done */
ZERO_NULL, /* do_more */
smb_connect, /* connect_it */
smb_connection_state, /* connecting */
smb_request_state, /* doing */
smb_getsock, /* proto_getsock */
smb_getsock, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
smb_disconnect, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
PORT_SMBS, /* defport */
CURLPROTO_SMBS, /* protocol */
PROTOPT_SSL /* flags */
};
#endif
#define MAX_PAYLOAD_SIZE 0x8000
#define MAX_MESSAGE_SIZE (MAX_PAYLOAD_SIZE + 0x1000)
#define CLIENTNAME "curl"
#define SERVICENAME "?????"
/* Append a string to an SMB message */
#define MSGCAT(str) \
strcpy(p, (str)); \
p += strlen(str);
/* Append a null-terminated string to an SMB message */
#define MSGCATNULL(str) \
strcpy(p, (str)); \
p += strlen(str) + 1;
/* SMB is mostly little endian */
#if (defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) || \
defined(__OS400__)
static unsigned short smb_swap16(unsigned short x)
{
return (unsigned short) ((x << 8) | ((x >> 8) & 0xff));
}
static unsigned int smb_swap32(unsigned int x)
{
return (x << 24) | ((x << 8) & 0xff0000) | ((x >> 8) & 0xff00) |
((x >> 24) & 0xff);
}
static curl_off_t smb_swap64(curl_off_t x)
{
return ((curl_off_t) smb_swap32((unsigned int) x) << 32) |
smb_swap32((unsigned int) (x >> 32));
}
#else
# define smb_swap16(x) (x)
# define smb_swap32(x) (x)
# define smb_swap64(x) (x)
#endif
/* SMB request state */
enum smb_req_state {
SMB_REQUESTING,
SMB_TREE_CONNECT,
SMB_OPEN,
SMB_DOWNLOAD,
SMB_UPLOAD,
SMB_CLOSE,
SMB_TREE_DISCONNECT,
SMB_DONE
};
/* SMB request data */
struct smb_request {
enum smb_req_state state;
char *share;
char *path;
unsigned short tid; /* Even if we connect to the same tree as another */
unsigned short fid; /* request, the tid will be different */
CURLcode result;
};
static void conn_state(struct connectdata *conn, enum smb_conn_state newstate)
{
struct smb_conn *smb = &conn->proto.smbc;
#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
/* For debug purposes */
static const char * const names[] = {
"SMB_NOT_CONNECTED",
"SMB_CONNECTING",
"SMB_NEGOTIATE",
"SMB_SETUP",
"SMB_CONNECTED",
/* LAST */
};
if(smb->state != newstate)
infof(conn->data, "SMB conn %p state change from %s to %s\n",
(void *)smb, names[smb->state], names[newstate]);
#endif
smb->state = newstate;
}
static void request_state(struct connectdata *conn,
enum smb_req_state newstate)
{
struct smb_request *req = conn->data->req.protop;
#if defined(DEBUGBUILD) && !defined(CURL_DISABLE_VERBOSE_STRINGS)
/* For debug purposes */
static const char * const names[] = {
"SMB_REQUESTING",
"SMB_TREE_CONNECT",
"SMB_OPEN",
"SMB_DOWNLOAD",
"SMB_UPLOAD",
"SMB_CLOSE",
"SMB_TREE_DISCONNECT",
"SMB_DONE",
/* LAST */
};
if(req->state != newstate)
infof(conn->data, "SMB request %p state change from %s to %s\n",
(void *)req, names[req->state], names[newstate]);
#endif
req->state = newstate;
}
static CURLcode smb_setup_connection(struct connectdata *conn)
{
struct smb_request *req;
/* Initialize the request state */
conn->data->req.protop = req = calloc(1, sizeof(struct smb_request));
if(!req)
return CURLE_OUT_OF_MEMORY;
/* Parse the URL path */
return smb_parse_url_path(conn);
}
static CURLcode smb_connect(struct connectdata *conn, bool *done)
{
struct smb_conn *smbc = &conn->proto.smbc;
char *slash;
(void) done;
/* Check we have a username and password to authenticate with */
if(!conn->bits.user_passwd)
return CURLE_LOGIN_DENIED;
/* Initialize the connection state */
memset(smbc, 0, sizeof(*smbc));
smbc->state = SMB_CONNECTING;
smbc->recv_buf = malloc(MAX_MESSAGE_SIZE);
if(!smbc->recv_buf)
return CURLE_OUT_OF_MEMORY;
/* Multiple requests are allowed with this connection */
connkeep(conn, "SMB default");
/* Parse the username, domain, and password */
slash = strchr(conn->user, '/');
if(!slash)
slash = strchr(conn->user, '\\');
if(slash) {
smbc->user = slash + 1;
smbc->domain = strdup(conn->user);
if(!smbc->domain)
return CURLE_OUT_OF_MEMORY;
smbc->domain[slash - conn->user] = 0;
}
else {
smbc->user = conn->user;
smbc->domain = strdup(conn->host.name);
if(!smbc->domain)
return CURLE_OUT_OF_MEMORY;
}
return CURLE_OK;
}
static CURLcode smb_recv_message(struct connectdata *conn, void **msg)
{
struct smb_conn *smbc = &conn->proto.smbc;
char *buf = smbc->recv_buf;
ssize_t bytes_read;
size_t nbt_size;
size_t msg_size;
size_t len = MAX_MESSAGE_SIZE - smbc->got;
CURLcode result;
result = Curl_read(conn, FIRSTSOCKET, buf + smbc->got, len, &bytes_read);
if(result)
return result;
if(!bytes_read)
return CURLE_OK;
smbc->got += bytes_read;
/* Check for a 32-bit nbt header */
if(smbc->got < sizeof(unsigned int))
return CURLE_OK;
nbt_size = Curl_read16_be((const unsigned char *)
(buf + sizeof(unsigned short))) +
sizeof(unsigned int);
if(smbc->got < nbt_size)
return CURLE_OK;
msg_size = sizeof(struct smb_header);
if(nbt_size >= msg_size + 1) {
/* Add the word count */
msg_size += 1 + ((unsigned char) buf[msg_size]) * sizeof(unsigned short);
if(nbt_size >= msg_size + sizeof(unsigned short)) {
/* Add the byte count */
msg_size += sizeof(unsigned short) +
Curl_read16_le((const unsigned char *)&buf[msg_size]);
if(nbt_size < msg_size)
return CURLE_READ_ERROR;
}
}
*msg = buf;
return CURLE_OK;
}
static void smb_pop_message(struct connectdata *conn)
{
struct smb_conn *smbc = &conn->proto.smbc;
smbc->got = 0;
}
static void smb_format_message(struct connectdata *conn, struct smb_header *h,
unsigned char cmd, size_t len)
{
struct smb_conn *smbc = &conn->proto.smbc;
struct smb_request *req = conn->data->req.protop;
unsigned int pid;
memset(h, 0, sizeof(*h));
h->nbt_length = htons((unsigned short) (sizeof(*h) - sizeof(unsigned int) +
len));
memcpy((char *)h->magic, "\xffSMB", 4);
h->command = cmd;
h->flags = SMB_FLAGS_CANONICAL_PATHNAMES | SMB_FLAGS_CASELESS_PATHNAMES;
h->flags2 = smb_swap16(SMB_FLAGS2_IS_LONG_NAME | SMB_FLAGS2_KNOWS_LONG_NAME);
h->uid = smb_swap16(smbc->uid);
h->tid = smb_swap16(req->tid);
pid = getpid();
h->pid_high = smb_swap16((unsigned short)(pid >> 16));
h->pid = smb_swap16((unsigned short) pid);
}
static CURLcode smb_send(struct connectdata *conn, ssize_t len,
size_t upload_size)
{
struct smb_conn *smbc = &conn->proto.smbc;
ssize_t bytes_written;
CURLcode result;
result = Curl_write(conn, FIRSTSOCKET, conn->data->state.uploadbuffer,
len, &bytes_written);
if(result)
return result;
if(bytes_written != len) {
smbc->send_size = len;
smbc->sent = bytes_written;
}
smbc->upload_size = upload_size;
return CURLE_OK;
}
static CURLcode smb_flush(struct connectdata *conn)
{
struct smb_conn *smbc = &conn->proto.smbc;
ssize_t bytes_written;
ssize_t len = smbc->send_size - smbc->sent;
CURLcode result;
if(!smbc->send_size)
return CURLE_OK;
result = Curl_write(conn, FIRSTSOCKET,
conn->data->state.uploadbuffer + smbc->sent,
len, &bytes_written);
if(result)
return result;
if(bytes_written != len)
smbc->sent += bytes_written;
else
smbc->send_size = 0;
return CURLE_OK;
}
static CURLcode smb_send_message(struct connectdata *conn, unsigned char cmd,
const void *msg, size_t msg_len)
{
smb_format_message(conn, (struct smb_header *)conn->data->state.uploadbuffer,
cmd, msg_len);
memcpy(conn->data->state.uploadbuffer + sizeof(struct smb_header),
msg, msg_len);
return smb_send(conn, sizeof(struct smb_header) + msg_len, 0);
}
static CURLcode smb_send_negotiate(struct connectdata *conn)
{
const char *msg = "\x00\x0c\x00\x02NT LM 0.12";
return smb_send_message(conn, SMB_COM_NEGOTIATE, msg, 15);
}
static CURLcode smb_send_setup(struct connectdata *conn)
{
struct smb_conn *smbc = &conn->proto.smbc;
struct smb_setup msg;
char *p = msg.bytes;
unsigned char lm_hash[21];
unsigned char lm[24];
unsigned char nt_hash[21];
unsigned char nt[24];
size_t byte_count = sizeof(lm) + sizeof(nt);
byte_count += strlen(smbc->user) + strlen(smbc->domain);
byte_count += strlen(OS) + strlen(CLIENTNAME) + 4; /* 4 null chars */
if(byte_count > sizeof(msg.bytes))
return CURLE_FILESIZE_EXCEEDED;
Curl_ntlm_core_mk_lm_hash(conn->data, conn->passwd, lm_hash);
Curl_ntlm_core_lm_resp(lm_hash, smbc->challenge, lm);
#ifdef USE_NTRESPONSES
Curl_ntlm_core_mk_nt_hash(conn->data, conn->passwd, nt_hash);
Curl_ntlm_core_lm_resp(nt_hash, smbc->challenge, nt);
#else
memset(nt, 0, sizeof(nt));
#endif
memset(&msg, 0, sizeof(msg));
msg.word_count = SMB_WC_SETUP_ANDX;
msg.andx.command = SMB_COM_NO_ANDX_COMMAND;
msg.max_buffer_size = smb_swap16(MAX_MESSAGE_SIZE);
msg.max_mpx_count = smb_swap16(1);
msg.vc_number = smb_swap16(1);
msg.session_key = smb_swap32(smbc->session_key);
msg.capabilities = smb_swap32(SMB_CAP_LARGE_FILES);
msg.lengths[0] = smb_swap16(sizeof(lm));
msg.lengths[1] = smb_swap16(sizeof(nt));
memcpy(p, lm, sizeof(lm));
p += sizeof(lm);
memcpy(p, nt, sizeof(nt));
p += sizeof(nt);
MSGCATNULL(smbc->user);
MSGCATNULL(smbc->domain);
MSGCATNULL(OS);
MSGCATNULL(CLIENTNAME);
byte_count = p - msg.bytes;
msg.byte_count = smb_swap16((unsigned short)byte_count);
return smb_send_message(conn, SMB_COM_SETUP_ANDX, &msg,
sizeof(msg) - sizeof(msg.bytes) + byte_count);
}
static CURLcode smb_send_tree_connect(struct connectdata *conn)
{
struct smb_request *req = conn->data->req.protop;
struct smb_tree_connect msg;
char *p = msg.bytes;
size_t byte_count = strlen(conn->host.name) + strlen(req->share);
byte_count += strlen(SERVICENAME) + 5; /* 2 nulls and 3 backslashes */
if(byte_count > sizeof(msg.bytes))
return CURLE_FILESIZE_EXCEEDED;
memset(&msg, 0, sizeof(msg));
msg.word_count = SMB_WC_TREE_CONNECT_ANDX;
msg.andx.command = SMB_COM_NO_ANDX_COMMAND;
msg.pw_len = 0;
MSGCAT("\\\\");
MSGCAT(conn->host.name);
MSGCAT("\\");
MSGCATNULL(req->share);
MSGCATNULL(SERVICENAME); /* Match any type of service */
byte_count = p - msg.bytes;
msg.byte_count = smb_swap16((unsigned short)byte_count);
return smb_send_message(conn, SMB_COM_TREE_CONNECT_ANDX, &msg,
sizeof(msg) - sizeof(msg.bytes) + byte_count);
}
static CURLcode smb_send_open(struct connectdata *conn)
{
struct smb_request *req = conn->data->req.protop;
struct smb_nt_create msg;
size_t byte_count;
if((strlen(req->path) + 1) > sizeof(msg.bytes))
return CURLE_FILESIZE_EXCEEDED;
memset(&msg, 0, sizeof(msg));
msg.word_count = SMB_WC_NT_CREATE_ANDX;
msg.andx.command = SMB_COM_NO_ANDX_COMMAND;
byte_count = strlen(req->path);
msg.name_length = smb_swap16((unsigned short)byte_count);
msg.share_access = smb_swap32(SMB_FILE_SHARE_ALL);
if(conn->data->set.upload) {
msg.access = smb_swap32(SMB_GENERIC_READ | SMB_GENERIC_WRITE);
msg.create_disposition = smb_swap32(SMB_FILE_OVERWRITE_IF);
}
else {
msg.access = smb_swap32(SMB_GENERIC_READ);
msg.create_disposition = smb_swap32(SMB_FILE_OPEN);
}
msg.byte_count = smb_swap16((unsigned short) ++byte_count);
strcpy(msg.bytes, req->path);
return smb_send_message(conn, SMB_COM_NT_CREATE_ANDX, &msg,
sizeof(msg) - sizeof(msg.bytes) + byte_count);
}
static CURLcode smb_send_close(struct connectdata *conn)
{
struct smb_request *req = conn->data->req.protop;
struct smb_close msg;
memset(&msg, 0, sizeof(msg));
msg.word_count = SMB_WC_CLOSE;
msg.fid = smb_swap16(req->fid);
return smb_send_message(conn, SMB_COM_CLOSE, &msg, sizeof(msg));
}
static CURLcode smb_send_tree_disconnect(struct connectdata *conn)
{
struct smb_tree_disconnect msg;
memset(&msg, 0, sizeof(msg));
return smb_send_message(conn, SMB_COM_TREE_DISCONNECT, &msg, sizeof(msg));
}
static CURLcode smb_send_read(struct connectdata *conn)
{
struct smb_request *req = conn->data->req.protop;
curl_off_t offset = conn->data->req.offset;
struct smb_read msg;
memset(&msg, 0, sizeof(msg));
msg.word_count = SMB_WC_READ_ANDX;
msg.andx.command = SMB_COM_NO_ANDX_COMMAND;
msg.fid = smb_swap16(req->fid);
msg.offset = smb_swap32((unsigned int) offset);
msg.offset_high = smb_swap32((unsigned int) (offset >> 32));
msg.min_bytes = smb_swap16(MAX_PAYLOAD_SIZE);
msg.max_bytes = smb_swap16(MAX_PAYLOAD_SIZE);
return smb_send_message(conn, SMB_COM_READ_ANDX, &msg, sizeof(msg));
}
static CURLcode smb_send_write(struct connectdata *conn)
{
struct smb_write *msg = (struct smb_write *)conn->data->state.uploadbuffer;
struct smb_request *req = conn->data->req.protop;
curl_off_t offset = conn->data->req.offset;
curl_off_t upload_size = conn->data->req.size - conn->data->req.bytecount;
if(upload_size >= MAX_PAYLOAD_SIZE - 1) /* There is one byte of padding */
upload_size = MAX_PAYLOAD_SIZE - 1;
memset(msg, 0, sizeof(*msg));
msg->word_count = SMB_WC_WRITE_ANDX;
msg->andx.command = SMB_COM_NO_ANDX_COMMAND;
msg->fid = smb_swap16(req->fid);
msg->offset = smb_swap32((unsigned int) offset);
msg->offset_high = smb_swap32((unsigned int) (offset >> 32));
msg->data_length = smb_swap16((unsigned short) upload_size);
msg->data_offset = smb_swap16(sizeof(*msg) - sizeof(unsigned int));
msg->byte_count = smb_swap16((unsigned short) (upload_size + 1));
smb_format_message(conn, &msg->h, SMB_COM_WRITE_ANDX,
sizeof(*msg) - sizeof(msg->h) + (size_t) upload_size);
return smb_send(conn, sizeof(*msg), (size_t) upload_size);
}
static CURLcode smb_send_and_recv(struct connectdata *conn, void **msg)
{
struct smb_conn *smbc = &conn->proto.smbc;
CURLcode result;
/* Check if there is data in the transfer buffer */
if(!smbc->send_size && smbc->upload_size) {
int nread = smbc->upload_size > UPLOAD_BUFSIZE ? UPLOAD_BUFSIZE :
(int) smbc->upload_size;
conn->data->req.upload_fromhere = conn->data->state.uploadbuffer;
result = Curl_fillreadbuffer(conn, nread, &nread);
if(result && result != CURLE_AGAIN)
return result;
if(!nread)
return CURLE_OK;
smbc->upload_size -= nread;
smbc->send_size = nread;
smbc->sent = 0;
}
/* Check if there is data to send */
if(smbc->send_size) {
result = smb_flush(conn);
if(result)
return result;
}
/* Check if there is still data to be sent */
if(smbc->send_size || smbc->upload_size)
return CURLE_AGAIN;
return smb_recv_message(conn, msg);
}
static CURLcode smb_connection_state(struct connectdata *conn, bool *done)
{
struct smb_conn *smbc = &conn->proto.smbc;
struct smb_negotiate_response *nrsp;
struct smb_header *h;
CURLcode result;
void *msg = NULL;
if(smbc->state == SMB_CONNECTING) {
#ifdef USE_SSL
if((conn->handler->flags & PROTOPT_SSL)) {
bool ssl_done = FALSE;
result = Curl_ssl_connect_nonblocking(conn, FIRSTSOCKET, &ssl_done);
if(result && result != CURLE_AGAIN)
return result;
if(!ssl_done)
return CURLE_OK;
}
#endif
result = smb_send_negotiate(conn);
if(result) {
connclose(conn, "SMB: failed to send negotiate message");
return result;
}
conn_state(conn, SMB_NEGOTIATE);
}
/* Send the previous message and check for a response */
result = smb_send_and_recv(conn, &msg);
if(result && result != CURLE_AGAIN) {
connclose(conn, "SMB: failed to communicate");
return result;
}
if(!msg)
return CURLE_OK;
h = msg;
switch(smbc->state) {
case SMB_NEGOTIATE:
if(h->status || smbc->got < sizeof(*nrsp) + sizeof(smbc->challenge) - 1) {
connclose(conn, "SMB: negotiation failed");
return CURLE_COULDNT_CONNECT;
}
nrsp = msg;
memcpy(smbc->challenge, nrsp->bytes, sizeof(smbc->challenge));
smbc->session_key = smb_swap32(nrsp->session_key);
result = smb_send_setup(conn);
if(result) {
connclose(conn, "SMB: failed to send setup message");
return result;
}
conn_state(conn, SMB_SETUP);
break;
case SMB_SETUP:
if(h->status) {
connclose(conn, "SMB: authentication failed");
return CURLE_LOGIN_DENIED;
}
smbc->uid = smb_swap16(h->uid);
conn_state(conn, SMB_CONNECTED);
*done = true;
break;
default:
smb_pop_message(conn);
return CURLE_OK; /* ignore */
}
smb_pop_message(conn);
return CURLE_OK;
}
/*
* Convert a timestamp from the Windows world (100 nsec units from 1 Jan 1601)
* to Posix time. Cap the output to fit within a time_t.
*/
static void get_posix_time(time_t *out, curl_off_t timestamp)
{
timestamp -= 116444736000000000;
timestamp /= 10000000;
#if SIZEOF_TIME_T < SIZEOF_CURL_OFF_T
if(timestamp > TIME_T_MAX)
*out = TIME_T_MAX;
else if(timestamp < TIME_T_MIN)
*out = TIME_T_MIN;
else
#endif
*out = (time_t) timestamp;
}
static CURLcode smb_request_state(struct connectdata *conn, bool *done)
{
struct smb_request *req = conn->data->req.protop;
struct smb_header *h;
struct smb_conn *smbc = &conn->proto.smbc;
enum smb_req_state next_state = SMB_DONE;
unsigned short len;
unsigned short off;
CURLcode result;
void *msg = NULL;
const struct smb_nt_create_response *smb_m;
/* Start the request */
if(req->state == SMB_REQUESTING) {
result = smb_send_tree_connect(conn);
if(result) {
connclose(conn, "SMB: failed to send tree connect message");
return result;
}
request_state(conn, SMB_TREE_CONNECT);
}
/* Send the previous message and check for a response */
result = smb_send_and_recv(conn, &msg);
if(result && result != CURLE_AGAIN) {
connclose(conn, "SMB: failed to communicate");
return result;
}
if(!msg)
return CURLE_OK;
h = msg;
switch(req->state) {
case SMB_TREE_CONNECT:
if(h->status) {
req->result = CURLE_REMOTE_FILE_NOT_FOUND;
if(h->status == smb_swap32(SMB_ERR_NOACCESS))
req->result = CURLE_REMOTE_ACCESS_DENIED;
break;
}
req->tid = smb_swap16(h->tid);
next_state = SMB_OPEN;
break;
case SMB_OPEN:
if(h->status || smbc->got < sizeof(struct smb_nt_create_response)) {
req->result = CURLE_REMOTE_FILE_NOT_FOUND;
next_state = SMB_TREE_DISCONNECT;
break;
}
smb_m = (const struct smb_nt_create_response*) msg;
req->fid = smb_swap16(smb_m->fid);
conn->data->req.offset = 0;
if(conn->data->set.upload) {
conn->data->req.size = conn->data->state.infilesize;
Curl_pgrsSetUploadSize(conn->data, conn->data->req.size);
next_state = SMB_UPLOAD;
}
else {
smb_m = (const struct smb_nt_create_response*) msg;
conn->data->req.size = smb_swap64(smb_m->end_of_file);
if(conn->data->req.size < 0) {
req->result = CURLE_WEIRD_SERVER_REPLY;
next_state = SMB_CLOSE;
}
else {
Curl_pgrsSetDownloadSize(conn->data, conn->data->req.size);
if(conn->data->set.get_filetime)
get_posix_time(&conn->data->info.filetime, smb_m->last_change_time);
next_state = SMB_DOWNLOAD;
}
}
break;
case SMB_DOWNLOAD:
if(h->status || smbc->got < sizeof(struct smb_header) + 14) {
req->result = CURLE_RECV_ERROR;
next_state = SMB_CLOSE;
break;
}
len = Curl_read16_le(((const unsigned char *) msg) +
sizeof(struct smb_header) + 11);
off = Curl_read16_le(((const unsigned char *) msg) +
sizeof(struct smb_header) + 13);
if(len > 0) {
if(off + sizeof(unsigned int) + len > smbc->got) {
failf(conn->data, "Invalid input packet");
result = CURLE_RECV_ERROR;
}
else
result = Curl_client_write(conn, CLIENTWRITE_BODY,
(char *)msg + off + sizeof(unsigned int),
len);
if(result) {
req->result = result;
next_state = SMB_CLOSE;
break;
}
}
conn->data->req.bytecount += len;
conn->data->req.offset += len;
Curl_pgrsSetDownloadCounter(conn->data, conn->data->req.bytecount);
next_state = (len < MAX_PAYLOAD_SIZE) ? SMB_CLOSE : SMB_DOWNLOAD;
break;
case SMB_UPLOAD:
if(h->status || smbc->got < sizeof(struct smb_header) + 6) {
req->result = CURLE_UPLOAD_FAILED;
next_state = SMB_CLOSE;
break;
}
len = Curl_read16_le(((const unsigned char *) msg) +
sizeof(struct smb_header) + 5);
conn->data->req.bytecount += len;
conn->data->req.offset += len;
Curl_pgrsSetUploadCounter(conn->data, conn->data->req.bytecount);
if(conn->data->req.bytecount >= conn->data->req.size)
next_state = SMB_CLOSE;
else
next_state = SMB_UPLOAD;
break;
case SMB_CLOSE:
/* We don't care if the close failed, proceed to tree disconnect anyway */
next_state = SMB_TREE_DISCONNECT;
break;
case SMB_TREE_DISCONNECT:
next_state = SMB_DONE;
break;
default:
smb_pop_message(conn);
return CURLE_OK; /* ignore */
}
smb_pop_message(conn);
switch(next_state) {
case SMB_OPEN:
result = smb_send_open(conn);
break;
case SMB_DOWNLOAD:
result = smb_send_read(conn);
break;
case SMB_UPLOAD:
result = smb_send_write(conn);
break;
case SMB_CLOSE:
result = smb_send_close(conn);
break;
case SMB_TREE_DISCONNECT:
result = smb_send_tree_disconnect(conn);
break;
case SMB_DONE:
result = req->result;
*done = true;
break;
default:
break;
}
if(result) {
connclose(conn, "SMB: failed to send message");
return result;
}
request_state(conn, next_state);
return CURLE_OK;
}
static CURLcode smb_done(struct connectdata *conn, CURLcode status,
bool premature)
{
struct smb_request *req = conn->data->req.protop;
(void) premature;
Curl_safefree(req->share);
Curl_safefree(conn->data->req.protop);
return status;
}
static CURLcode smb_disconnect(struct connectdata *conn, bool dead)
{
struct smb_conn *smbc = &conn->proto.smbc;
struct smb_request *req = conn->data->req.protop;
(void) dead;
Curl_safefree(smbc->domain);
Curl_safefree(smbc->recv_buf);
/* smb_done is not always called, so cleanup the request */
if(req) {
Curl_safefree(req->share);
}
return CURLE_OK;
}
static int smb_getsock(struct connectdata *conn, curl_socket_t *socks,
int numsocks)
{
if(!numsocks)
return GETSOCK_BLANK;
socks[0] = conn->sock[FIRSTSOCKET];
return GETSOCK_READSOCK(0) | GETSOCK_WRITESOCK(0);
}
static CURLcode smb_parse_url_path(struct connectdata *conn)
{
CURLcode result = CURLE_OK;
struct Curl_easy *data = conn->data;
struct smb_request *req = data->req.protop;
char *path;
char *slash;
/* URL decode the path */
result = Curl_urldecode(data, data->state.path, 0, &path, NULL, TRUE);
if(result)
return result;
/* Parse the path for the share */
req->share = strdup((*path == '/' || *path == '\\') ? path + 1 : path);
free(path);
if(!req->share)
return CURLE_OUT_OF_MEMORY;
slash = strchr(req->share, '/');
if(!slash)
slash = strchr(req->share, '\\');
/* The share must be present */
if(!slash) {
Curl_safefree(req->share);
return CURLE_URL_MALFORMAT;
}
/* Parse the path for the file path converting any forward slashes into
backslashes */
*slash++ = 0;
req->path = slash;
for(; *slash; slash++) {
if(*slash == '/')
*slash = '\\';
}
return CURLE_OK;
}
#endif /* !USE_WINDOWS_SSPI || USE_WIN32_CRYPTO */
#endif /* CURL_DISABLE_SMB && USE_NTLM && CURL_SIZEOF_CURL_OFF_T > 4 */
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