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sane-project-backends/frontend/saned.c

1313 wiersze
31 KiB
C
Czysty Wina Historia

/* sane - Scanner Access Now Easy.
Copyright (C) 1997 Andreas Beck
Copyright (C) 2001, 2002 Henning Meier-Geinitz
This file is part of the SANE package.
SANE 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 2 of the License, or (at your
option) any later version.
SANE 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 sane; see the file COPYING. If not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
The SANE network daemon. This is the counterpart to the NET
backend.
*/
#ifdef _AIX
# include "../include/lalloca.h" /* MUST come first for AIX! */
#endif
#include "../include/sane/config.h"
#include "../include/lalloca.h"
#include "../include/sys/types.h"
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#ifdef HAVE_LIBC_H
# include <libc.h> /* NeXTStep/OpenStep */
#endif
#ifdef HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif
#include <netinet/in.h>
#include <stdarg.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include "../include/sane/sane.h"
#include "../include/sane/sanei.h"
#include "../include/sane/sanei_net.h"
#include "../include/sane/sanei_codec_bin.h"
#include "../include/sane/sanei_config.h"
#include "../include/sane/sanei_auth.h"
#ifndef EXIT_SUCCESS
# define EXIT_SUCCESS 0
#endif
#ifndef IN_LOOPBACK
# define IN_LOOPBACK(addr) (addr == 0x7f000001L)
#endif
#ifndef MAXHOSTNAMELEN
# define MAXHOSTNAMELEN 120
#endif
#define SANED_CONFIG_FILE "saned.conf"
typedef struct
{
u_int inuse:1; /* is this handle in use? */
u_int scanning:1; /* are we scanning? */
u_int docancel:1; /* cancel the current scan */
SANE_Handle handle; /* backends handle */
}
Handle;
static SANE_Net_Procedure_Number current_request;
static const char *prog_name;
static int can_authorize;
static Wire wire;
static int num_handles;
static int debug;
static Handle *handle;
static union
{
int w;
u_char ch;
}
byte_order;
/* The default-user name. This is not used to imply any rights. All
it does is save a remote user some work by reducing the amount of
text s/he has to type when authentication is requested. */
static const char *default_username = "saned-user";
static char *remote_hostname;
static struct in_addr remote_address;
#ifndef _PATH_HEQUIV
# define _PATH_HEQUIV "/etc/hosts.equiv"
#endif
static const char *config_file_names[] = {
_PATH_HEQUIV, SANED_CONFIG_FILE
};
static SANE_Bool log_to_syslog = SANE_TRUE;
/* forward declarations: */
static void process_request (Wire * w);
#define DBG_ERR 1
#define DBG_WARN 2
#define DBG_MSG 3
#define DBG_INFO 4
#define DBG_DBG 5
#define DBG saned_debug_call
static void
saned_debug_call (int level, const char *fmt, ...)
{
#ifndef NDEBUG
va_list ap;
va_start (ap, fmt);
if (debug >= level)
{
if (log_to_syslog)
{
/* print to syslog */
vsyslog (LOG_DEBUG, fmt, ap);
}
else
{
/* print to stderr */
fprintf (stderr, "[saned] ");
vfprintf (stderr, fmt, ap);
}
}
va_end (ap);
#endif
}
static void
reset_watchdog (void)
{
if (!debug)
alarm (3600);
}
static void
auth_callback (SANE_String_Const res,
SANE_Char username[SANE_MAX_USERNAME_LEN],
SANE_Char password[SANE_MAX_PASSWORD_LEN])
{
SANE_Net_Procedure_Number procnum;
SANE_Authorization_Req req;
SANE_Word word, ack = 0;
memset (username, 0, sizeof (username));
memset (password, 0, sizeof (password));
if (!can_authorize)
{
DBG (DBG_WARN,
"auth_callback: called during non-authorizable RPC (resource=%s)\n",
res);
return;
}
if (wire.status)
{
DBG(DBG_ERR, "auth_callback: bad status %d\n", wire.status);
return;
}
switch (current_request)
{
case SANE_NET_OPEN:
{
SANE_Open_Reply reply;
memset (&reply, 0, sizeof (reply));
reply.resource_to_authorize = (char *) res;
sanei_w_reply (&wire, (WireCodecFunc) sanei_w_open_reply, &reply);
}
break;
case SANE_NET_CONTROL_OPTION:
{
SANE_Control_Option_Reply reply;
memset (&reply, 0, sizeof (reply));
reply.resource_to_authorize = (char *) res;
sanei_w_reply (&wire,
(WireCodecFunc) sanei_w_control_option_reply, &reply);
}
break;
case SANE_NET_START:
{
SANE_Start_Reply reply;
memset (&reply, 0, sizeof (reply));
reply.resource_to_authorize = (char *) res;
sanei_w_reply (&wire, (WireCodecFunc) sanei_w_start_reply, &reply);
}
break;
default:
DBG (DBG_WARN,
"auth_callback: called for unexpected request %d (resource=%s)\n",
current_request, res);
break;
}
if (wire.status)
{
DBG(DBG_ERR, "auth_callback: bad status %d\n", wire.status);
return;
}
reset_watchdog ();
sanei_w_set_dir (&wire, WIRE_DECODE);
sanei_w_word (&wire, &word);
if (wire.status)
{
DBG(DBG_ERR, "auth_callback: bad status %d\n", wire.status);
return;
}
procnum = word;
if (procnum != SANE_NET_AUTHORIZE)
{
DBG (DBG_WARN,
"auth_callback: bad procedure number %d "
"(expected: %d, resource=%s)\n", procnum, SANE_NET_AUTHORIZE,
res);
return;
}
sanei_w_authorization_req (&wire, &req);
if (wire.status)
{
DBG(DBG_ERR, "auth_callback: bad status %d\n", wire.status);
return;
}
if (req.username)
strcpy (username, req.username);
if (req.password)
strcpy (password, req.password);
if (!req.resource || strcmp (req.resource, res) != 0)
{
DBG (DBG_MSG,
"auth_callback: got auth for resource %s (expected resource=%s)\n",
res, req.resource);
}
sanei_w_free (&wire, (WireCodecFunc) sanei_w_authorization_req, &req);
sanei_w_reply (&wire, (WireCodecFunc) sanei_w_word, &ack);
}
static void
quit (int signum)
{
static int running = 0;
int i;
if (signum)
DBG (DBG_ERR, "quit: received signal %d\n", signum);
if (running)
{
DBG (DBG_ERR, "quit: already active, returning\n");
return;
}
running = 1;
for (i = 0; i < num_handles; ++i)
if (handle[i].inuse)
sane_close (handle[i].handle);
sane_exit ();
sanei_w_exit (&wire);
if (handle)
free (handle);
DBG (DBG_WARN, "quit: exiting\n");
closelog ();
exit (EXIT_SUCCESS); /* This is a nowait-daemon. */
}
static SANE_Word
get_free_handle (void)
{
# define ALLOC_INCREMENT 16
static int h, last_handle_checked = -1;
if (num_handles > 0)
{
h = last_handle_checked + 1;
do
{
if (h >= num_handles)
h = 0;
if (!handle[h].inuse)
{
last_handle_checked = h;
memset (handle + h, 0, sizeof (handle[0]));
handle[h].inuse = 1;
return h;
}
++h;
}
while (h != last_handle_checked);
}
/* we're out of handles---alloc some more: */
last_handle_checked = num_handles - 1;
num_handles += ALLOC_INCREMENT;
if (handle)
handle = realloc (handle, num_handles * sizeof (handle[0]));
else
handle = malloc (num_handles * sizeof (handle[0]));
if (!handle)
return -1;
memset (handle + last_handle_checked + 1, 0,
ALLOC_INCREMENT * sizeof (handle[0]));
return get_free_handle ();
# undef ALLOC_INCREMENT
}
static void
close_handle (int h)
{
if (handle[h].inuse)
sane_close (handle[h].handle);
handle[h].inuse = 0;
}
static SANE_Word
decode_handle (Wire * w, const char *op)
{
SANE_Word h;
sanei_w_word (w, &h);
if (w->status || (unsigned) h >= (unsigned) num_handles || !handle[h].inuse)
{
DBG (DBG_ERR,
"decode_handle: %s: error while decoding handle argument "
"(h=%d, %s)\n", op, h, strerror (w->status));
return -1;
}
return h;
}
/* Access control */
static SANE_Status
check_host (int fd)
{
struct sockaddr_in sin;
int j, access_ok = 0;
struct hostent *he;
char text_addr[64];
char config_line[1024];
char hostname[MAXHOSTNAMELEN];
char *r_hostname;
static struct in_addr config_line_address;
int len;
FILE *fp;
/* Get address of remote host */
len = sizeof (sin);
if (getpeername (fd, (struct sockaddr *) &sin, (socklen_t *) &len) < 0)
{
DBG (DBG_ERR, "check_host: getpeername failed: %s\n", strerror (errno));
return SANE_STATUS_INVAL;
}
r_hostname = inet_ntoa (sin.sin_addr);
remote_hostname = strdup (r_hostname);
DBG (DBG_WARN, "check_host: access by remote host: %s\n",
remote_hostname);
/* Save remote address for check of control and data connections */
memcpy (&remote_address, &sin.sin_addr, sizeof (remote_address));
/* Always allow access from local host. Do it here to avoid DNS lookups
and reading saned.conf. */
if (IN_LOOPBACK (ntohl (sin.sin_addr.s_addr)))
{
DBG (DBG_MSG,
"check_host: remote host is IN_LOOPBACK: access accepted\n");
return SANE_STATUS_GOOD;
}
DBG (DBG_DBG, "check_host: remote host is not IN_LOOPBACK\n");
/* Get name of local host */
if (gethostname (hostname, sizeof (hostname)) < 0)
{
DBG (DBG_ERR, "check_host: gethostname failed: %s\n", strerror (errno));
return SANE_STATUS_INVAL;
}
DBG (DBG_DBG, "check_host: local hostname: %s\n", hostname);
/* Get local address */
he = gethostbyname (hostname);
if (!he)
{
DBG (DBG_ERR, "check_host: gethostbyname failed: %s\n",
strerror (errno));
return SANE_STATUS_INVAL;
}
DBG (DBG_DBG, "check_host: local hostname (from DNS): %s\n",
he->h_name);
if ((he->h_length == 4) || he->h_addrtype == AF_INET)
{
if (!inet_ntop (he->h_addrtype, he->h_addr_list[0], text_addr,
sizeof (text_addr)))
strcpy (text_addr, "[error]");
DBG (DBG_DBG, "check_host: local host address (from DNS): %s\n",
text_addr);
if (memcmp (he->h_addr_list[0], &remote_address.s_addr, 4) == 0)
{
DBG (DBG_MSG,
"check_host: remote host has same addr as local: "
"access accepted\n");
return SANE_STATUS_GOOD;
}
}
else
{
DBG (DBG_ERR, "check_host: can't get local address "
"(only IPv4 is supported)\n");
}
DBG (DBG_DBG,
"check_host: remote host doesn't have same addr as local\n");
/* must be a remote host: check contents of PATH_NET_CONFIG or
/etc/hosts.equiv if former doesn't exist: */
for (j = 0; j < NELEMS (config_file_names); ++j)
{
DBG (DBG_DBG, "check_host: opening config file: %s\n",
config_file_names[j]);
if (config_file_names[j][0] == '/')
fp = fopen (config_file_names[j], "r");
else
fp = sanei_config_open (config_file_names[j]);
if (!fp)
{
DBG (DBG_MSG,
"check_host: can't open config file: %s (%s)\n",
config_file_names[j], strerror (errno));
continue;
}
while (!access_ok && sanei_config_read (config_line,
sizeof (config_line), fp))
{
DBG (DBG_DBG, "check_host: config file line: `%s'\n", config_line);
if (config_line[0] == '#') /* ignore line comments */
continue;
len = strlen (config_line);
if (!len)
continue; /* ignore empty lines */
if (strcmp (config_line, "+") == 0)
{
access_ok = 1;
DBG (DBG_DBG,
"check_host: access accepted from any host (`+')\n");
}
else
{
if (inet_pton (AF_INET, config_line, &config_line_address) > 0)
{
if (memcmp (&remote_address.s_addr,
&config_line_address.s_addr, 4) == 0)
access_ok = 1;
}
else
{
DBG (DBG_DBG,
"check_host: inet_pton for `%s' failed\n",
config_line);
he = gethostbyname (config_line);
if (!he)
{
DBG (DBG_DBG,
"check_host: gethostbyname for `%s' failed: %s\n",
config_line, strerror (errno));
DBG (DBG_MSG, "check_host: entry isn't an IP address "
"and can't be found in DNS\n");
continue;
}
if (!inet_ntop (he->h_addrtype, he->h_addr_list[0],
text_addr, sizeof (text_addr)))
strcpy (text_addr, "[error]");
DBG (DBG_MSG,
"check_host: DNS lookup returns IP address: %s\n",
text_addr);
if (memcmp (&remote_address.s_addr,
he->h_addr_list[0], 4) == 0)
access_ok = 1;
}
}
}
fclose (fp);
if (access_ok)
return SANE_STATUS_GOOD;
}
return SANE_STATUS_ACCESS_DENIED;
}
static int
init (Wire * w)
{
SANE_Word word, be_version_code;
SANE_Init_Reply reply;
SANE_Status status;
SANE_Init_Req req;
reset_watchdog ();
status = check_host (w->io.fd);
if (status != SANE_STATUS_GOOD)
{
DBG (DBG_WARN, "init: access by host %s denied\n", remote_hostname);
return -1;
}
sanei_w_set_dir (w, WIRE_DECODE);
if (w->status)
{
DBG (DBG_ERR, "init: bad status after sanei_w_set_dir: %d\n", w->status);
return -1;
}
sanei_w_word (w, &word); /* decode procedure number */
if (w->status || word != SANE_NET_INIT)
{
DBG (DBG_ERR, "init: bad status=%d or procnum=%d\n",
w->status, word);
return -1;
}
sanei_w_init_req (w, &req);
if (w->status)
{
DBG (DBG_ERR, "init: bad status after sanei_w_init_req: %d\n", w->status);
return -1;
}
w->version = SANEI_NET_PROTOCOL_VERSION;
if (req.username)
default_username = strdup (req.username);
sanei_w_free (w, (WireCodecFunc) sanei_w_init_req, &req);
if (w->status)
{
DBG (DBG_ERR, "init: bad status after sanei_w_free: %d\n", w->status);
return -1;
}
reply.version_code = SANE_VERSION_CODE (V_MAJOR, V_MINOR,
SANEI_NET_PROTOCOL_VERSION);
DBG (DBG_WARN, "init: access by %s@%s accepted\n",
default_username, remote_hostname);
if (status == SANE_STATUS_GOOD)
{
status = sane_init (&be_version_code, auth_callback);
if (status != SANE_STATUS_GOOD)
DBG (DBG_ERR, "init: failed to initialize backend (%s)\n",
sane_strstatus (status));
if (SANE_VERSION_MAJOR (be_version_code) != V_MAJOR)
{
DBG (DBG_ERR,
"init: unexpected backend major version %d (expected %d)\n",
SANE_VERSION_MAJOR (be_version_code), V_MAJOR);
status = SANE_STATUS_INVAL;
}
}
reply.status = status;
if (status != SANE_STATUS_GOOD)
reply.version_code = 0;
sanei_w_reply (w, (WireCodecFunc) sanei_w_init_reply, &reply);
if (w->status || status != SANE_STATUS_GOOD)
return -1;
return 0;
}
static int
start_scan (Wire * w, int h, SANE_Start_Reply * reply)
{
struct sockaddr_in sin;
SANE_Handle be_handle;
int fd, len;
be_handle = handle[h].handle;
len = sizeof (sin);
if (getsockname (w->io.fd, (struct sockaddr *) &sin, (socklen_t *) &len) < 0)
{
DBG (DBG_ERR, "start_scan: failed to obtain socket address (%s)\n",
strerror (errno));
reply->status = SANE_STATUS_IO_ERROR;
return -1;
}
fd = socket (AF_INET, SOCK_STREAM, 0);
if (fd < 0)
{
DBG (DBG_ERR, "start_scan: failed to obtain data socket (%s)\n",
strerror (errno));
reply->status = SANE_STATUS_IO_ERROR;
return -1;
}
sin.sin_port = 0;
if (bind (fd, (struct sockaddr *) &sin, len) < 0)
{
DBG (DBG_ERR, "start_scan: failed to bind address (%s)\n",
strerror (errno));
reply->status = SANE_STATUS_IO_ERROR;
return -1;
}
if (listen (fd, 1) < 0)
{
DBG (DBG_ERR, "start_scan: failed to make socket listen (%s)\n",
strerror (errno));
reply->status = SANE_STATUS_IO_ERROR;
return -1;
}
if (getsockname (fd, (struct sockaddr *) &sin, (socklen_t *) &len) < 0)
{
DBG (DBG_ERR, "start_scan: failed to obtain socket address (%s)\n",
strerror (errno));
reply->status = SANE_STATUS_IO_ERROR;
return -1;
}
reply->port = ntohs (sin.sin_port);
DBG (DBG_MSG, "start_scan: using port %d for data\n", reply->port);
reply->status = sane_start (be_handle);
if (reply->status == SANE_STATUS_GOOD)
{
handle[h].scanning = 1;
handle[h].docancel = 0;
}
return fd;
}
static int
store_reclen (SANE_Byte * buf, size_t buf_size, int i, size_t reclen)
{
buf[i++] = (reclen >> 24) & 0xff;
if (i >= (int) buf_size)
i = 0;
buf[i++] = (reclen >> 16) & 0xff;
if (i >= (int) buf_size)
i = 0;
buf[i++] = (reclen >> 8) & 0xff;
if (i >= (int) buf_size)
i = 0;
buf[i++] = (reclen >> 0) & 0xff;
if (i >= (int) buf_size)
i = 0;
return i;
}
static void
do_scan (Wire * w, int h, int data_fd)
{
int num_fds, be_fd = -1, reader, writer, bytes_in_buf, status_dirty = 0;
SANE_Handle be_handle = handle[h].handle;
struct timeval tv, *timeout = 0;
fd_set rd_set, rd_mask, wr_set, wr_mask;
SANE_Byte buf[8192];
SANE_Status status;
long int nwritten;
SANE_Int length;
size_t nbytes;
DBG (3, "do_scan: start\n");
FD_ZERO (&rd_mask);
FD_SET (w->io.fd, &rd_mask);
num_fds = w->io.fd + 1;
FD_ZERO (&wr_mask);
FD_SET (data_fd, &wr_mask);
if (data_fd >= num_fds)
num_fds = data_fd + 1;
sane_set_io_mode (be_handle, SANE_TRUE);
if (sane_get_select_fd (be_handle, &be_fd) == SANE_STATUS_GOOD)
{
FD_SET (be_fd, &rd_mask);
if (be_fd >= num_fds)
num_fds = be_fd + 1;
}
else
{
memset (&tv, 0, sizeof (tv));
timeout = &tv;
}
status = SANE_STATUS_GOOD;
reader = writer = bytes_in_buf = 0;
do
{
rd_set = rd_mask;
wr_set = wr_mask;
if (select (num_fds, &rd_set, &wr_set, 0, timeout) < 0)
{
if (be_fd >= 0 && errno == EBADF)
{
/* This normally happens when a backend closes a select
filedescriptor when reaching the end of file. So
pass back this status to the client: */
FD_CLR (be_fd, &rd_mask);
be_fd = -1;
/* only set status_dirty if EOF hasn't been already detected */
if (status == SANE_STATUS_GOOD)
status_dirty = 1;
status = SANE_STATUS_EOF;
DBG (DBG_INFO, "do_scan: select_fd was closed --> EOF\n");
continue;
}
else
{
status = SANE_STATUS_IO_ERROR;
DBG (DBG_ERR, "do_scan: select failed (%s)\n", strerror (errno));
break;
}
}
if (bytes_in_buf)
{
if (FD_ISSET (data_fd, &wr_set))
{
if (bytes_in_buf > 0)
{
/* write more input data */
nbytes = bytes_in_buf;
if (writer + nbytes > sizeof (buf))
nbytes = sizeof (buf) - writer;
DBG (DBG_INFO,
"do_scan: trying to write %d bytes to client\n",
nbytes);
nwritten = write (data_fd, buf + writer, nbytes);
DBG (DBG_INFO,
"do_scan: wrote %ld bytes to client\n", nwritten);
if (nwritten < 0)
{
DBG (DBG_ERR, "do_scan: write failed (%s)\n",
strerror (errno));
status = SANE_STATUS_CANCELLED;
break;
}
bytes_in_buf -= nwritten;
writer += nwritten;
if (writer == sizeof (buf))
writer = 0;
}
}
}
else if (status == SANE_STATUS_GOOD
&& (timeout || FD_ISSET (be_fd, &rd_set)))
{
int i;
/* get more input data */
/* reserve 4 bytes to store the length of the data record: */
i = reader;
reader += 4;
if (reader >= (int) sizeof (buf))
reader -= sizeof(buf);
assert (bytes_in_buf == 0);
nbytes = sizeof (buf) - 4;
if (reader + nbytes > sizeof (buf))
nbytes = sizeof (buf) - reader;
DBG (DBG_INFO,
"do_scan: trying to read %d bytes from scanner\n", nbytes);
status = sane_read (be_handle, buf + reader, nbytes, &length);
DBG (DBG_INFO,
"do_scan: read %d bytes from scanner\n", length);
reset_watchdog ();
reader += length;
if (reader >= (int) sizeof (buf))
reader = 0;
bytes_in_buf += length + 4;
if (status != SANE_STATUS_GOOD)
{
reader = i; /* restore reader index */
status_dirty = 1;
DBG (DBG_MSG,
"do_scan: status = `%s'\n", sane_strstatus(status));
}
else
store_reclen (buf, sizeof (buf), i, length);
}
if (status_dirty && sizeof (buf) - bytes_in_buf >= 5)
{
status_dirty = 0;
reader = store_reclen (buf, sizeof (buf), reader, 0xffffffff);
buf[reader] = status;
bytes_in_buf += 5;
DBG (DBG_MSG, "do_scan: statuscode `%s' was added to buffer\n",
sane_strstatus(status));
}
if (FD_ISSET (w->io.fd, &rd_set))
{
DBG (DBG_MSG,
"do_scan: processing RPC request on fd %d\n", w->io.fd);
process_request (w);
if (handle[h].docancel)
break;
}
}
while (status == SANE_STATUS_GOOD || bytes_in_buf > 0 || status_dirty);
DBG (DBG_MSG, "do_scan: done, status=%s\n", sane_strstatus (status));
handle[h].docancel = 0;
handle[h].scanning = 0;
}
static void
process_request (Wire * w)
{
SANE_Handle be_handle;
SANE_Word h, word;
int i;
DBG (DBG_DBG, "process_request: waiting for request\n");
sanei_w_set_dir (w, WIRE_DECODE);
sanei_w_word (w, &word); /* decode procedure number */
if (w->status)
{
DBG (DBG_ERR,
"process_request: bad status %d\n", w->status);
quit (0);
}
current_request = word;
DBG (DBG_MSG, "process_request: got request %d\n", current_request);
switch (current_request)
{
case SANE_NET_GET_DEVICES:
{
SANE_Get_Devices_Reply reply;
reply.status =
sane_get_devices ((const SANE_Device ***) &reply.device_list,
SANE_TRUE);
sanei_w_reply (w, (WireCodecFunc) sanei_w_get_devices_reply, &reply);
}
break;
case SANE_NET_OPEN:
{
SANE_Open_Reply reply;
SANE_Handle be_handle;
SANE_String name, resource;
sanei_w_string (w, &name);
if (w->status)
{
DBG (DBG_ERR,
"process_request: (open) error while decoding args (%s)\n",
strerror (w->status));
return;
}
can_authorize = 1;
resource = strdup (name);
if (strlen(resource) == 0) {
const SANE_Device **device_list;
DBG(DBG_DBG, "process_request: (open) strlen(resource) == 0\n");
free (resource);
if ((i = sane_get_devices (&device_list, SANE_TRUE)) !=
SANE_STATUS_GOOD)
{
DBG(DBG_ERR, "process_request: (open) sane_get_devices failed\n");
memset (&reply, 0, sizeof (reply));
reply.status = i;
sanei_w_reply (w, (WireCodecFunc) sanei_w_open_reply, &reply);
break;
}
if ((device_list == NULL) || (device_list[0] == NULL))
{
DBG(DBG_ERR, "process_request: (open) device_list[0] == 0\n");
memset (&reply, 0, sizeof (reply));
reply.status = SANE_STATUS_INVAL;
sanei_w_reply (w, (WireCodecFunc) sanei_w_open_reply, &reply);
break;
}
resource = strdup (device_list[0]->name);
}
if (strchr (resource, ':'))
*(strchr (resource, ':')) = 0;
if (sanei_authorize (resource, "saned", auth_callback) !=
SANE_STATUS_GOOD)
{
DBG (DBG_ERR, "process_request: access to resource `%s' denied\n",
resource);
free (resource);
memset (&reply, 0, sizeof (reply)); /* avoid leaking bits */
reply.status = SANE_STATUS_ACCESS_DENIED;
}
else
{
DBG (DBG_MSG, "process_request: access to resource `%s' accepted\n",
resource);
free (resource);
memset (&reply, 0, sizeof (reply)); /* avoid leaking bits */
reply.status = sane_open (name, &be_handle);
}
if (reply.status == SANE_STATUS_GOOD)
{
h = get_free_handle ();
if (h < 0)
reply.status = SANE_STATUS_NO_MEM;
else
{
handle[h].handle = be_handle;
reply.handle = h;
}
}
can_authorize = 0;
sanei_w_reply (w, (WireCodecFunc) sanei_w_open_reply, &reply);
sanei_w_free (w, (WireCodecFunc) sanei_w_string, &name);
}
break;
case SANE_NET_CLOSE:
{
SANE_Word ack = 0;
h = decode_handle (w, "close");
close_handle (h);
sanei_w_reply (w, (WireCodecFunc) sanei_w_word, &ack);
}
break;
case SANE_NET_GET_OPTION_DESCRIPTORS:
{
SANE_Option_Descriptor_Array opt;
h = decode_handle (w, "get_option_descriptors");
if (h < 0)
return;
be_handle = handle[h].handle;
sane_control_option (be_handle, 0, SANE_ACTION_GET_VALUE,
&opt.num_options, 0);
opt.desc = malloc (opt.num_options * sizeof (opt.desc[0]));
for (i = 0; i < opt.num_options; ++i)
opt.desc[i] = (SANE_Option_Descriptor *)
sane_get_option_descriptor (be_handle, i);
sanei_w_reply (w,(WireCodecFunc) sanei_w_option_descriptor_array,
&opt);
free (opt.desc);
}
break;
case SANE_NET_CONTROL_OPTION:
{
SANE_Control_Option_Req req;
SANE_Control_Option_Reply reply;
sanei_w_control_option_req (w, &req);
if (w->status || (unsigned) req.handle >= (unsigned) num_handles
|| !handle[req.handle].inuse)
{
DBG (DBG_ERR,
"process_rquest: (control_option) "
"error while decoding args h=%d (%s)\n"
, req.handle, strerror (w->status));
return;
}
can_authorize = 1;
memset (&reply, 0, sizeof (reply)); /* avoid leaking bits */
be_handle = handle[req.handle].handle;
reply.status = sane_control_option (be_handle, req.option,
req.action, req.value,
&reply.info);
reply.value_type = req.value_type;
reply.value_size = req.value_size;
reply.value = req.value;
can_authorize = 0;
sanei_w_reply (w, (WireCodecFunc) sanei_w_control_option_reply,
&reply);
sanei_w_free (w, (WireCodecFunc) sanei_w_control_option_req, &req);
}
break;
case SANE_NET_GET_PARAMETERS:
{
SANE_Get_Parameters_Reply reply;
h = decode_handle (w, "get_parameters");
if (h < 0)
return;
be_handle = handle[h].handle;
reply.status = sane_get_parameters (be_handle, &reply.params);
sanei_w_reply (w, (WireCodecFunc) sanei_w_get_parameters_reply,
&reply);
}
break;
case SANE_NET_START:
{
SANE_Start_Reply reply;
int fd = -1, data_fd;
h = decode_handle (w, "start");
if (h < 0)
return;
memset (&reply, 0, sizeof (reply)); /* avoid leaking bits */
reply.byte_order = SANE_NET_LITTLE_ENDIAN;
if (byte_order.w != 1)
reply.byte_order = SANE_NET_BIG_ENDIAN;
if (handle[h].scanning)
reply.status = SANE_STATUS_DEVICE_BUSY;
else
fd = start_scan (w, h, &reply);
sanei_w_reply (w, (WireCodecFunc) sanei_w_start_reply, &reply);
if (reply.status == SANE_STATUS_GOOD)
{
struct sockaddr_in sin;
int len;
DBG (DBG_MSG, "process_request: waiting for data connection\n");
data_fd = accept (fd, 0, 0);
close (fd);
/* Get address of remote host */
len = sizeof (sin);
if (getpeername (data_fd, (struct sockaddr *) &sin,
(socklen_t *) &len) < 0)
{
DBG (DBG_ERR, "process_request: getpeername failed: %s\n",
strerror (errno));
return;
}
if (memcmp (&remote_address, &sin.sin_addr,
sizeof (remote_address)) != 0)
{
DBG (DBG_ERR,
"process_request: access to data port from %s\n",
inet_ntoa (sin.sin_addr));
DBG (DBG_ERR,
"process_request: however, only %s is authorized\n",
inet_ntoa (remote_address));
DBG (DBG_ERR,
"process_request: configuration problem or attack?\n");
close (data_fd);
data_fd = -1;
quit (0);
}
else
DBG (DBG_MSG, "process_request: access to data port from %s\n",
inet_ntoa (sin.sin_addr));
if (data_fd < 0)
{
sane_cancel (handle[h].handle);
handle[h].scanning = 0;
handle[h].docancel = 0;
DBG (DBG_ERR, "process_request: accept failed! (%s)\n",
strerror (errno));
return;
}
fcntl (data_fd, F_SETFL, 1); /* set non-blocking */
shutdown (data_fd, 0);
do_scan (w, h, data_fd);
close (data_fd);
}
}
break;
case SANE_NET_CANCEL:
{
SANE_Word ack = 0;
h = decode_handle (w, "cancel");
sane_cancel (handle[h].handle);
handle[h].docancel = 1;
sanei_w_reply (w, (WireCodecFunc) sanei_w_word, &ack);
}
break;
case SANE_NET_EXIT:
quit (0);
break;
case SANE_NET_INIT:
case SANE_NET_AUTHORIZE:
default:
DBG (DBG_ERR,
"process_request: received unexpected procedure number %d\n",
current_request);
quit (0);
}
}
int
main (int argc, char *argv[])
{
int fd, on = 1;
#ifdef TCP_NODELAY
int level = -1;
#endif
debug = DBG_WARN;
openlog ("saned", LOG_PID | LOG_CONS, LOG_DAEMON);
prog_name = strrchr (argv[0], '/');
if (prog_name)
++prog_name;
else
prog_name = argv[0];
byte_order.w = 0;
byte_order.ch = 1;
sanei_w_init (&wire, sanei_codec_bin_init);
wire.io.read = read;
wire.io.write = write;
if (argc == 2 &&
(strncmp (argv[1], "-d", 2) == 0 || strncmp (argv[1], "-s", 2) == 0))
{
/* don't operate in daemon mode: wait for connection request: */
struct sockaddr_in sin;
struct servent *serv;
short port;
if (argv[1][2])
debug = atoi (argv[1] + 2);
if (strncmp (argv[1], "-d", 2) == 0)
log_to_syslog = SANE_FALSE;
DBG (DBG_WARN, "main: starting debug mode (level %d)\n", debug);
memset (&sin, 0, sizeof (sin));
DBG (DBG_DBG,
"main: trying to get port for service `sane' (getservbyname)\n");
serv = getservbyname ("sane", "tcp");
if (serv)
{
port = serv->s_port;
DBG (DBG_MSG, "main: port is %d\n", ntohs (port));
}
else
{
port = htons (6566);
DBG (DBG_WARN, "main: could not find `sane' service (%s)\n",
strerror (errno));
DBG (DBG_WARN, "main: using default port %d\n", ntohs (port));
}
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_port = port;
DBG (DBG_DBG, "main: socket ()\n");
fd = socket (AF_INET, SOCK_STREAM, 0);
DBG (DBG_DBG, "main: setsockopt ()\n");
if (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on)))
DBG (DBG_ERR, "failed to put socket in SO_REUSEADDR mode (%s)",
strerror (errno));
DBG (DBG_DBG, "main: bind ()\n");
if (bind (fd, (struct sockaddr *) &sin, sizeof (sin)) < 0)
{
DBG (DBG_ERR, "main: bind failed: %s", strerror (errno));
exit (1);
}
DBG (DBG_DBG, "main: listen ()\n");
if (listen (fd, 1) < 0)
{
DBG (DBG_ERR, "main: listen failed: %s", strerror (errno));
exit (1);
}
DBG (DBG_MSG, "main: waiting for control connection\n");
wire.io.fd = accept (fd, 0, 0);
if (wire.io.fd < 0)
{
DBG (DBG_ERR, "main: accept failed: %s", strerror (errno));
exit (1);
}
close (fd);
}
else
/* use filedescriptor opened by inetd: */
#ifdef HAVE_OS2_H
/* under OS/2, the socket handle is passed as argument on the command
line; the socket handle is relative to IBM TCP/IP, so a call
to impsockethandle() is required to add it to the EMX runtime */
if (argc == 2)
{
wire.io.fd = _impsockhandle (atoi (argv[1]), 0);
if (wire.io.fd == -1)
perror ("impsockhandle");
}
else
#endif /* HAVE_OS2_H */
wire.io.fd = 1;
signal (SIGALRM, quit);
signal (SIGPIPE, quit);
#ifdef TCP_NODELAY
# ifdef SOL_TCP
level = SOL_TCP;
# else /* !SOL_TCP */
/* Look up the protocol level in the protocols database. */
{
struct protoent *p;
p = getprotobyname ("tcp");
if (p == 0)
{
DBG (DBG_WARN, "main:: cannot look up `tcp' protocol number");
}
else
level = p->p_proto;
}
# endif /* SOL_TCP */
if (level == -1
|| setsockopt (wire.io.fd, level, TCP_NODELAY, &on, sizeof (on)))
DBG (DBG_WARN, "main: failed to put socket in TCP_NODELAY mode (%s)",
strerror (errno));
#endif /* !TCP_NODELAY */
DBG (DBG_WARN, "saned from %s ready\n", PACKAGE_STRING);
if (init (&wire) < 0)
quit (0);
while (1)
{
reset_watchdog ();
process_request (&wire);
}
}
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