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openssh-portable/sftp-server.c

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/*
* Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "includes.h"
RCSID("$OpenBSD: sftp-server.c,v 1.47 2004/06/25 05:38:48 dtucker Exp $");
#include "buffer.h"
#include "bufaux.h"
#include "getput.h"
#include "log.h"
#include "xmalloc.h"
#include "sftp.h"
#include "sftp-common.h"
/* helper */
#define get_int64() buffer_get_int64(&iqueue);
#define get_int() buffer_get_int(&iqueue);
#define get_string(lenp) buffer_get_string(&iqueue, lenp);
#define TRACE debug
#ifdef HAVE___PROGNAME
extern char *__progname;
#else
char *__progname;
#endif
/* input and output queue */
Buffer iqueue;
Buffer oqueue;
/* Version of client */
int version;
/* portable attributes, etc. */
typedef struct Stat Stat;
struct Stat {
char *name;
char *long_name;
Attrib attrib;
};
static int
errno_to_portable(int unixerrno)
{
int ret = 0;
switch (unixerrno) {
case 0:
ret = SSH2_FX_OK;
break;
case ENOENT:
case ENOTDIR:
case EBADF:
case ELOOP:
ret = SSH2_FX_NO_SUCH_FILE;
break;
case EPERM:
case EACCES:
case EFAULT:
ret = SSH2_FX_PERMISSION_DENIED;
break;
case ENAMETOOLONG:
case EINVAL:
ret = SSH2_FX_BAD_MESSAGE;
break;
default:
ret = SSH2_FX_FAILURE;
break;
}
return ret;
}
static int
flags_from_portable(int pflags)
{
int flags = 0;
if ((pflags & SSH2_FXF_READ) &&
(pflags & SSH2_FXF_WRITE)) {
flags = O_RDWR;
} else if (pflags & SSH2_FXF_READ) {
flags = O_RDONLY;
} else if (pflags & SSH2_FXF_WRITE) {
flags = O_WRONLY;
}
if (pflags & SSH2_FXF_CREAT)
flags |= O_CREAT;
if (pflags & SSH2_FXF_TRUNC)
flags |= O_TRUNC;
if (pflags & SSH2_FXF_EXCL)
flags |= O_EXCL;
return flags;
}
static Attrib *
get_attrib(void)
{
return decode_attrib(&iqueue);
}
/* handle handles */
typedef struct Handle Handle;
struct Handle {
int use;
DIR *dirp;
int fd;
char *name;
};
enum {
HANDLE_UNUSED,
HANDLE_DIR,
HANDLE_FILE
};
Handle handles[100];
static void
handle_init(void)
{
int i;
for (i = 0; i < sizeof(handles)/sizeof(Handle); i++)
handles[i].use = HANDLE_UNUSED;
}
static int
handle_new(int use, const char *name, int fd, DIR *dirp)
{
int i;
for (i = 0; i < sizeof(handles)/sizeof(Handle); i++) {
if (handles[i].use == HANDLE_UNUSED) {
handles[i].use = use;
handles[i].dirp = dirp;
handles[i].fd = fd;
handles[i].name = xstrdup(name);
return i;
}
}
return -1;
}
static int
handle_is_ok(int i, int type)
{
return i >= 0 && i < sizeof(handles)/sizeof(Handle) &&
handles[i].use == type;
}
static int
handle_to_string(int handle, char **stringp, int *hlenp)
{
if (stringp == NULL || hlenp == NULL)
return -1;
*stringp = xmalloc(sizeof(int32_t));
PUT_32BIT(*stringp, handle);
*hlenp = sizeof(int32_t);
return 0;
}
static int
handle_from_string(const char *handle, u_int hlen)
{
int val;
if (hlen != sizeof(int32_t))
return -1;
val = GET_32BIT(handle);
if (handle_is_ok(val, HANDLE_FILE) ||
handle_is_ok(val, HANDLE_DIR))
return val;
return -1;
}
static char *
handle_to_name(int handle)
{
if (handle_is_ok(handle, HANDLE_DIR)||
handle_is_ok(handle, HANDLE_FILE))
return handles[handle].name;
return NULL;
}
static DIR *
handle_to_dir(int handle)
{
if (handle_is_ok(handle, HANDLE_DIR))
return handles[handle].dirp;
return NULL;
}
static int
handle_to_fd(int handle)
{
if (handle_is_ok(handle, HANDLE_FILE))
return handles[handle].fd;
return -1;
}
static int
handle_close(int handle)
{
int ret = -1;
if (handle_is_ok(handle, HANDLE_FILE)) {
ret = close(handles[handle].fd);
handles[handle].use = HANDLE_UNUSED;
xfree(handles[handle].name);
} else if (handle_is_ok(handle, HANDLE_DIR)) {
ret = closedir(handles[handle].dirp);
handles[handle].use = HANDLE_UNUSED;
xfree(handles[handle].name);
} else {
errno = ENOENT;
}
return ret;
}
static int
get_handle(void)
{
char *handle;
int val = -1;
u_int hlen;
handle = get_string(&hlen);
if (hlen < 256)
val = handle_from_string(handle, hlen);
xfree(handle);
return val;
}
/* send replies */
static void
send_msg(Buffer *m)
{
int mlen = buffer_len(m);
buffer_put_int(&oqueue, mlen);
buffer_append(&oqueue, buffer_ptr(m), mlen);
buffer_consume(m, mlen);
}
static void
send_status(u_int32_t id, u_int32_t status)
{
Buffer msg;
const char *status_messages[] = {
"Success", /* SSH_FX_OK */
"End of file", /* SSH_FX_EOF */
"No such file", /* SSH_FX_NO_SUCH_FILE */
"Permission denied", /* SSH_FX_PERMISSION_DENIED */
"Failure", /* SSH_FX_FAILURE */
"Bad message", /* SSH_FX_BAD_MESSAGE */
"No connection", /* SSH_FX_NO_CONNECTION */
"Connection lost", /* SSH_FX_CONNECTION_LOST */
"Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
"Unknown error" /* Others */
};
TRACE("sent status id %u error %u", id, status);
buffer_init(&msg);
buffer_put_char(&msg, SSH2_FXP_STATUS);
buffer_put_int(&msg, id);
buffer_put_int(&msg, status);
if (version >= 3) {
buffer_put_cstring(&msg,
status_messages[MIN(status,SSH2_FX_MAX)]);
buffer_put_cstring(&msg, "");
}
send_msg(&msg);
buffer_free(&msg);
}
static void
send_data_or_handle(char type, u_int32_t id, const char *data, int dlen)
{
Buffer msg;
buffer_init(&msg);
buffer_put_char(&msg, type);
buffer_put_int(&msg, id);
buffer_put_string(&msg, data, dlen);
send_msg(&msg);
buffer_free(&msg);
}
static void
send_data(u_int32_t id, const char *data, int dlen)
{
TRACE("sent data id %u len %d", id, dlen);
send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
}
static void
send_handle(u_int32_t id, int handle)
{
char *string;
int hlen;
handle_to_string(handle, &string, &hlen);
TRACE("sent handle id %u handle %d", id, handle);
send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
xfree(string);
}
static void
send_names(u_int32_t id, int count, const Stat *stats)
{
Buffer msg;
int i;
buffer_init(&msg);
buffer_put_char(&msg, SSH2_FXP_NAME);
buffer_put_int(&msg, id);
buffer_put_int(&msg, count);
TRACE("sent names id %u count %d", id, count);
for (i = 0; i < count; i++) {
buffer_put_cstring(&msg, stats[i].name);
buffer_put_cstring(&msg, stats[i].long_name);
encode_attrib(&msg, &stats[i].attrib);
}
send_msg(&msg);
buffer_free(&msg);
}
static void
send_attrib(u_int32_t id, const Attrib *a)
{
Buffer msg;
TRACE("sent attrib id %u have 0x%x", id, a->flags);
buffer_init(&msg);
buffer_put_char(&msg, SSH2_FXP_ATTRS);
buffer_put_int(&msg, id);
encode_attrib(&msg, a);
send_msg(&msg);
buffer_free(&msg);
}
/* parse incoming */
static void
process_init(void)
{
Buffer msg;
version = get_int();
TRACE("client version %d", version);
buffer_init(&msg);
buffer_put_char(&msg, SSH2_FXP_VERSION);
buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
send_msg(&msg);
buffer_free(&msg);
}
static void
process_open(void)
{
u_int32_t id, pflags;
Attrib *a;
char *name;
int handle, fd, flags, mode, status = SSH2_FX_FAILURE;
id = get_int();
name = get_string(NULL);
pflags = get_int(); /* portable flags */
a = get_attrib();
flags = flags_from_portable(pflags);
mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a->perm : 0666;
TRACE("open id %u name %s flags %d mode 0%o", id, name, pflags, mode);
fd = open(name, flags, mode);
if (fd < 0) {
status = errno_to_portable(errno);
} else {
handle = handle_new(HANDLE_FILE, name, fd, NULL);
if (handle < 0) {
close(fd);
} else {
send_handle(id, handle);
status = SSH2_FX_OK;
}
}
if (status != SSH2_FX_OK)
send_status(id, status);
xfree(name);
}
static void
process_close(void)
{
u_int32_t id;
int handle, ret, status = SSH2_FX_FAILURE;
id = get_int();
handle = get_handle();
TRACE("close id %u handle %d", id, handle);
ret = handle_close(handle);
status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
send_status(id, status);
}
static void
process_read(void)
{
char buf[64*1024];
u_int32_t id, len;
int handle, fd, ret, status = SSH2_FX_FAILURE;
u_int64_t off;
id = get_int();
handle = get_handle();
off = get_int64();
len = get_int();
TRACE("read id %u handle %d off %llu len %d", id, handle,
(u_int64_t)off, len);
if (len > sizeof buf) {
len = sizeof buf;
logit("read change len %d", len);
}
fd = handle_to_fd(handle);
if (fd >= 0) {
if (lseek(fd, off, SEEK_SET) < 0) {
error("process_read: seek failed");
status = errno_to_portable(errno);
} else {
ret = read(fd, buf, len);
if (ret < 0) {
status = errno_to_portable(errno);
} else if (ret == 0) {
status = SSH2_FX_EOF;
} else {
send_data(id, buf, ret);
status = SSH2_FX_OK;
}
}
}
if (status != SSH2_FX_OK)
send_status(id, status);
}
static void
process_write(void)
{
u_int32_t id;
u_int64_t off;
u_int len;
int handle, fd, ret, status = SSH2_FX_FAILURE;
char *data;
id = get_int();
handle = get_handle();
off = get_int64();
data = get_string(&len);
TRACE("write id %u handle %d off %llu len %d", id, handle,
(u_int64_t)off, len);
fd = handle_to_fd(handle);
if (fd >= 0) {
if (lseek(fd, off, SEEK_SET) < 0) {
status = errno_to_portable(errno);
error("process_write: seek failed");
} else {
/* XXX ATOMICIO ? */
ret = write(fd, data, len);
if (ret == -1) {
error("process_write: write failed");
status = errno_to_portable(errno);
} else if (ret == len) {
status = SSH2_FX_OK;
} else {
logit("nothing at all written");
}
}
}
send_status(id, status);
xfree(data);
}
static void
process_do_stat(int do_lstat)
{
Attrib a;
struct stat st;
u_int32_t id;
char *name;
int ret, status = SSH2_FX_FAILURE;
id = get_int();
name = get_string(NULL);
TRACE("%sstat id %u name %s", do_lstat ? "l" : "", id, name);
ret = do_lstat ? lstat(name, &st) : stat(name, &st);
if (ret < 0) {
status = errno_to_portable(errno);
} else {
stat_to_attrib(&st, &a);
send_attrib(id, &a);
status = SSH2_FX_OK;
}
if (status != SSH2_FX_OK)
send_status(id, status);
xfree(name);
}
static void
process_stat(void)
{
process_do_stat(0);
}
static void
process_lstat(void)
{
process_do_stat(1);
}
static void
process_fstat(void)
{
Attrib a;
struct stat st;
u_int32_t id;
int fd, ret, handle, status = SSH2_FX_FAILURE;
id = get_int();
handle = get_handle();
TRACE("fstat id %u handle %d", id, handle);
fd = handle_to_fd(handle);
if (fd >= 0) {
ret = fstat(fd, &st);
if (ret < 0) {
status = errno_to_portable(errno);
} else {
stat_to_attrib(&st, &a);
send_attrib(id, &a);
status = SSH2_FX_OK;
}
}
if (status != SSH2_FX_OK)
send_status(id, status);
}
static struct timeval *
attrib_to_tv(const Attrib *a)
{
static struct timeval tv[2];
tv[0].tv_sec = a->atime;
tv[0].tv_usec = 0;
tv[1].tv_sec = a->mtime;
tv[1].tv_usec = 0;
return tv;
}
static void
process_setstat(void)
{
Attrib *a;
u_int32_t id;
char *name;
int status = SSH2_FX_OK, ret;
id = get_int();
name = get_string(NULL);
a = get_attrib();
TRACE("setstat id %u name %s", id, name);
if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
ret = truncate(name, a->size);
if (ret == -1)
status = errno_to_portable(errno);
}
if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
ret = chmod(name, a->perm & 0777);
if (ret == -1)
status = errno_to_portable(errno);
}
if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
ret = utimes(name, attrib_to_tv(a));
if (ret == -1)
status = errno_to_portable(errno);
}
if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
ret = chown(name, a->uid, a->gid);
if (ret == -1)
status = errno_to_portable(errno);
}
send_status(id, status);
xfree(name);
}
static void
process_fsetstat(void)
{
Attrib *a;
u_int32_t id;
int handle, fd, ret;
int status = SSH2_FX_OK;
char *name;
id = get_int();
handle = get_handle();
a = get_attrib();
TRACE("fsetstat id %u handle %d", id, handle);
fd = handle_to_fd(handle);
name = handle_to_name(handle);
if (fd < 0 || name == NULL) {
status = SSH2_FX_FAILURE;
} else {
if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
ret = ftruncate(fd, a->size);
if (ret == -1)
status = errno_to_portable(errno);
}
if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
#ifdef HAVE_FCHMOD
ret = fchmod(fd, a->perm & 0777);
#else
ret = chmod(name, a->perm & 0777);
#endif
if (ret == -1)
status = errno_to_portable(errno);
}
if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
#ifdef HAVE_FUTIMES
ret = futimes(fd, attrib_to_tv(a));
#else
ret = utimes(name, attrib_to_tv(a));
#endif
if (ret == -1)
status = errno_to_portable(errno);
}
if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
#ifdef HAVE_FCHOWN
ret = fchown(fd, a->uid, a->gid);
#else
ret = chown(name, a->uid, a->gid);
#endif
if (ret == -1)
status = errno_to_portable(errno);
}
}
send_status(id, status);
}
static void
process_opendir(void)
{
DIR *dirp = NULL;
char *path;
int handle, status = SSH2_FX_FAILURE;
u_int32_t id;
id = get_int();
path = get_string(NULL);
TRACE("opendir id %u path %s", id, path);
dirp = opendir(path);
if (dirp == NULL) {
status = errno_to_portable(errno);
} else {
handle = handle_new(HANDLE_DIR, path, 0, dirp);
if (handle < 0) {
closedir(dirp);
} else {
send_handle(id, handle);
status = SSH2_FX_OK;
}
}
if (status != SSH2_FX_OK)
send_status(id, status);
xfree(path);
}
static void
process_readdir(void)
{
DIR *dirp;
struct dirent *dp;
char *path;
int handle;
u_int32_t id;
id = get_int();
handle = get_handle();
TRACE("readdir id %u handle %d", id, handle);
dirp = handle_to_dir(handle);
path = handle_to_name(handle);
if (dirp == NULL || path == NULL) {
send_status(id, SSH2_FX_FAILURE);
} else {
struct stat st;
char pathname[1024];
Stat *stats;
int nstats = 10, count = 0, i;
stats = xmalloc(nstats * sizeof(Stat));
while ((dp = readdir(dirp)) != NULL) {
if (count >= nstats) {
nstats *= 2;
stats = xrealloc(stats, nstats * sizeof(Stat));
}
/* XXX OVERFLOW ? */
snprintf(pathname, sizeof pathname, "%s%s%s", path,
strcmp(path, "/") ? "/" : "", dp->d_name);
if (lstat(pathname, &st) < 0)
continue;
stat_to_attrib(&st, &(stats[count].attrib));
stats[count].name = xstrdup(dp->d_name);
stats[count].long_name = ls_file(dp->d_name, &st, 0);
count++;
/* send up to 100 entries in one message */
/* XXX check packet size instead */
if (count == 100)
break;
}
if (count > 0) {
send_names(id, count, stats);
for (i = 0; i < count; i++) {
xfree(stats[i].name);
xfree(stats[i].long_name);
}
} else {
send_status(id, SSH2_FX_EOF);
}
xfree(stats);
}
}
static void
process_remove(void)
{
char *name;
u_int32_t id;
int status = SSH2_FX_FAILURE;
int ret;
id = get_int();
name = get_string(NULL);
TRACE("remove id %u name %s", id, name);
ret = unlink(name);
status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
send_status(id, status);
xfree(name);
}
static void
process_mkdir(void)
{
Attrib *a;
u_int32_t id;
char *name;
int ret, mode, status = SSH2_FX_FAILURE;
id = get_int();
name = get_string(NULL);
a = get_attrib();
mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
a->perm & 0777 : 0777;
TRACE("mkdir id %u name %s mode 0%o", id, name, mode);
ret = mkdir(name, mode);
status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
send_status(id, status);
xfree(name);
}
static void
process_rmdir(void)
{
u_int32_t id;
char *name;
int ret, status;
id = get_int();
name = get_string(NULL);
TRACE("rmdir id %u name %s", id, name);
ret = rmdir(name);
status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
send_status(id, status);
xfree(name);
}
static void
process_realpath(void)
{
char resolvedname[MAXPATHLEN];
u_int32_t id;
char *path;
id = get_int();
path = get_string(NULL);
if (path[0] == '\0') {
xfree(path);
path = xstrdup(".");
}
TRACE("realpath id %u path %s", id, path);
if (realpath(path, resolvedname) == NULL) {
send_status(id, errno_to_portable(errno));
} else {
Stat s;
attrib_clear(&s.attrib);
s.name = s.long_name = resolvedname;
send_names(id, 1, &s);
}
xfree(path);
}
static void
process_rename(void)
{
u_int32_t id;
char *oldpath, *newpath;
int status;
struct stat sb;
id = get_int();
oldpath = get_string(NULL);
newpath = get_string(NULL);
TRACE("rename id %u old %s new %s", id, oldpath, newpath);
status = SSH2_FX_FAILURE;
if (lstat(oldpath, &sb) == -1)
status = errno_to_portable(errno);
else if (S_ISREG(sb.st_mode)) {
/* Race-free rename of regular files */
if (link(oldpath, newpath) == -1) {
if (errno == EOPNOTSUPP) {
struct stat st;
/*
* fs doesn't support links, so fall back to
* stat+rename. This is racy.
*/
if (stat(newpath, &st) == -1) {
if (rename(oldpath, newpath) == -1)
status =
errno_to_portable(errno);
else
status = SSH2_FX_OK;
}
} else {
status = errno_to_portable(errno);
}
} else if (unlink(oldpath) == -1) {
status = errno_to_portable(errno);
/* clean spare link */
unlink(newpath);
} else
status = SSH2_FX_OK;
} else if (stat(newpath, &sb) == -1) {
if (rename(oldpath, newpath) == -1)
status = errno_to_portable(errno);
else
status = SSH2_FX_OK;
}
send_status(id, status);
xfree(oldpath);
xfree(newpath);
}
static void
process_readlink(void)
{
u_int32_t id;
int len;
char buf[MAXPATHLEN];
char *path;
id = get_int();
path = get_string(NULL);
TRACE("readlink id %u path %s", id, path);
if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
send_status(id, errno_to_portable(errno));
else {
Stat s;
buf[len] = '\0';
attrib_clear(&s.attrib);
s.name = s.long_name = buf;
send_names(id, 1, &s);
}
xfree(path);
}
static void
process_symlink(void)
{
u_int32_t id;
char *oldpath, *newpath;
int ret, status;
id = get_int();
oldpath = get_string(NULL);
newpath = get_string(NULL);
TRACE("symlink id %u old %s new %s", id, oldpath, newpath);
/* this will fail if 'newpath' exists */
ret = symlink(oldpath, newpath);
status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
send_status(id, status);
xfree(oldpath);
xfree(newpath);
}
static void
process_extended(void)
{
u_int32_t id;
char *request;
id = get_int();
request = get_string(NULL);
send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
xfree(request);
}
/* stolen from ssh-agent */
static void
process(void)
{
u_int msg_len;
u_int buf_len;
u_int consumed;
u_int type;
u_char *cp;
buf_len = buffer_len(&iqueue);
if (buf_len < 5)
return; /* Incomplete message. */
cp = buffer_ptr(&iqueue);
msg_len = GET_32BIT(cp);
if (msg_len > 256 * 1024) {
error("bad message ");
exit(11);
}
if (buf_len < msg_len + 4)
return;
buffer_consume(&iqueue, 4);
buf_len -= 4;
type = buffer_get_char(&iqueue);
switch (type) {
case SSH2_FXP_INIT:
process_init();
break;
case SSH2_FXP_OPEN:
process_open();
break;
case SSH2_FXP_CLOSE:
process_close();
break;
case SSH2_FXP_READ:
process_read();
break;
case SSH2_FXP_WRITE:
process_write();
break;
case SSH2_FXP_LSTAT:
process_lstat();
break;
case SSH2_FXP_FSTAT:
process_fstat();
break;
case SSH2_FXP_SETSTAT:
process_setstat();
break;
case SSH2_FXP_FSETSTAT:
process_fsetstat();
break;
case SSH2_FXP_OPENDIR:
process_opendir();
break;
case SSH2_FXP_READDIR:
process_readdir();
break;
case SSH2_FXP_REMOVE:
process_remove();
break;
case SSH2_FXP_MKDIR:
process_mkdir();
break;
case SSH2_FXP_RMDIR:
process_rmdir();
break;
case SSH2_FXP_REALPATH:
process_realpath();
break;
case SSH2_FXP_STAT:
process_stat();
break;
case SSH2_FXP_RENAME:
process_rename();
break;
case SSH2_FXP_READLINK:
process_readlink();
break;
case SSH2_FXP_SYMLINK:
process_symlink();
break;
case SSH2_FXP_EXTENDED:
process_extended();
break;
default:
error("Unknown message %d", type);
break;
}
/* discard the remaining bytes from the current packet */
if (buf_len < buffer_len(&iqueue))
fatal("iqueue grows");
consumed = buf_len - buffer_len(&iqueue);
if (msg_len < consumed)
fatal("msg_len %d < consumed %d", msg_len, consumed);
if (msg_len > consumed)
buffer_consume(&iqueue, msg_len - consumed);
}
int
main(int ac, char **av)
{
fd_set *rset, *wset;
int in, out, max;
ssize_t len, olen, set_size;
/* XXX should use getopt */
__progname = ssh_get_progname(av[0]);
handle_init();
#ifdef DEBUG_SFTP_SERVER
log_init("sftp-server", SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 0);
#endif
in = dup(STDIN_FILENO);
out = dup(STDOUT_FILENO);
#ifdef HAVE_CYGWIN
setmode(in, O_BINARY);
setmode(out, O_BINARY);
#endif
max = 0;
if (in > max)
max = in;
if (out > max)
max = out;
buffer_init(&iqueue);
buffer_init(&oqueue);
set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
rset = (fd_set *)xmalloc(set_size);
wset = (fd_set *)xmalloc(set_size);
for (;;) {
memset(rset, 0, set_size);
memset(wset, 0, set_size);
FD_SET(in, rset);
olen = buffer_len(&oqueue);
if (olen > 0)
FD_SET(out, wset);
if (select(max+1, rset, wset, NULL, NULL) < 0) {
if (errno == EINTR)
continue;
exit(2);
}
/* copy stdin to iqueue */
if (FD_ISSET(in, rset)) {
char buf[4*4096];
len = read(in, buf, sizeof buf);
if (len == 0) {
debug("read eof");
exit(0);
} else if (len < 0) {
error("read error");
exit(1);
} else {
buffer_append(&iqueue, buf, len);
}
}
/* send oqueue to stdout */
if (FD_ISSET(out, wset)) {
len = write(out, buffer_ptr(&oqueue), olen);
if (len < 0) {
error("write error");
exit(1);
} else {
buffer_consume(&oqueue, len);
}
}
/* process requests from client */
process();
}
}
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