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cups/backend/network.c

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Import Upstream version 2.3.1
2022-05-13 20:08:20 +08:00
/*
* Common backend network APIs for CUPS.
*
* Copyright © 2007-2016 by Apple Inc.
* Copyright © 2006-2007 by Easy Software Products, all rights reserved.
*
* Licensed under Apache License v2.0. See the file "LICENSE" for more
* information.
*/
/*
* Include necessary headers.
*/
#include "backend-private.h"
#include <limits.h>
#include <sys/select.h>
/*
* 'backendCheckSideChannel()' - Check the side-channel for pending requests.
*/
void
backendCheckSideChannel(
int snmp_fd, /* I - SNMP socket */
http_addr_t *addr) /* I - Address of device */
{
fd_set input; /* Select input set */
struct timeval timeout; /* Select timeout */
FD_ZERO(&input);
FD_SET(CUPS_SC_FD, &input);
timeout.tv_sec = timeout.tv_usec = 0;
if (select(CUPS_SC_FD + 1, &input, NULL, NULL, &timeout) > 0)
backendNetworkSideCB(-1, -1, snmp_fd, addr, 0);
}
/*
* 'backendLookup()' - Lookup the given host and log addresses.
*/
http_addrlist_t * /* O - List of addresses or NULL */
backendLookup(const char *hostname, /* I - Hostname */
int port, /* I - Port number */
int *cancel) /* I - Variable to watch for job cancel */
{
char portname[32], /* Port number as string */
addrname[256]; /* Address as string */
http_addrlist_t *addrlist, /* List of addresses */
*current; /* Current address */
/*
* Lookup the address for the named host...
*/
snprintf(portname, sizeof(portname), "%d", port);
fputs("STATE: +connecting-to-device\n", stderr);
fprintf(stderr, "DEBUG: Looking up \"%s\"...\n", hostname);
while ((addrlist = httpAddrGetList(hostname, AF_UNSPEC, portname)) == NULL)
{
_cupsLangPrintFilter(stderr, "INFO", _("Unable to locate printer \"%s\"."), hostname);
sleep(10);
if (getenv("CLASS") != NULL)
{
fputs("STATE: -connecting-to-device\n", stderr);
exit(CUPS_BACKEND_STOP);
}
if (cancel && *cancel)
{
fputs("STATE: -connecting-to-device\n", stderr);
exit(CUPS_BACKEND_OK);
}
}
fputs("STATE: -connecting-to-device\n", stderr);
/*
* Log the addresses we got...
*/
for (current = addrlist; current; current = current->next)
fprintf(stderr, "DEBUG: %s=%s\n", hostname, httpAddrString(&current->addr, addrname, sizeof(addrname)));
/*
* Return...
*/
return (addrlist);
}
/*
* 'backendNetworkSideCB()' - Handle common network side-channel commands.
*/
int /* O - -1 on error, 0 on success */
backendNetworkSideCB(
int print_fd, /* I - Print file or -1 */
int device_fd, /* I - Device file or -1 */
int snmp_fd, /* I - SNMP socket */
http_addr_t *addr, /* I - Address of device */
int use_bc) /* I - Use back-channel data? */
{
cups_sc_command_t command; /* Request command */
cups_sc_status_t status; /* Request/response status */
char data[65536]; /* Request/response data */
int datalen; /* Request/response data size */
const char *device_id; /* 1284DEVICEID env var */
datalen = sizeof(data);
if (cupsSideChannelRead(&command, &status, data, &datalen, 1.0))
return (-1);
switch (command)
{
case CUPS_SC_CMD_DRAIN_OUTPUT :
/*
* Our sockets disable the Nagle algorithm and data is sent immediately.
*/
if (device_fd < 0)
status = CUPS_SC_STATUS_NOT_IMPLEMENTED;
else if (backendDrainOutput(print_fd, device_fd))
status = CUPS_SC_STATUS_IO_ERROR;
else
status = CUPS_SC_STATUS_OK;
datalen = 0;
break;
case CUPS_SC_CMD_GET_BIDI :
status = CUPS_SC_STATUS_OK;
data[0] = (char)use_bc;
datalen = 1;
break;
case CUPS_SC_CMD_SNMP_GET :
case CUPS_SC_CMD_SNMP_GET_NEXT :
fprintf(stderr, "DEBUG: CUPS_SC_CMD_SNMP_%s: %d (%s)\n",
command == CUPS_SC_CMD_SNMP_GET ? "GET" : "GET_NEXT", datalen,
data);
if (datalen < 2)
{
status = CUPS_SC_STATUS_BAD_MESSAGE;
datalen = 0;
break;
}
if (snmp_fd >= 0)
{
char *dataptr; /* Pointer into data */
cups_snmp_t packet; /* Packet from printer */
const char *snmp_value; /* CUPS_SNMP_VALUE env var */
if ((snmp_value = getenv("CUPS_SNMP_VALUE")) != NULL)
{
const char *snmp_count; /* CUPS_SNMP_COUNT env var */
int count; /* Repetition count */
if ((snmp_count = getenv("CUPS_SNMP_COUNT")) != NULL)
{
if ((count = atoi(snmp_count)) <= 0)
count = 1;
}
else
count = 1;
for (dataptr = data + strlen(data) + 1;
count > 0 && dataptr < (data + sizeof(data) - 1);
count --, dataptr += strlen(dataptr))
strlcpy(dataptr, snmp_value, sizeof(data) - (size_t)(dataptr - data));
fprintf(stderr, "DEBUG: Returning %s %s\n", data,
data + strlen(data) + 1);
status = CUPS_SC_STATUS_OK;
datalen = (int)(dataptr - data);
break;
}
if (!_cupsSNMPStringToOID(data, packet.object_name, CUPS_SNMP_MAX_OID))
{
status = CUPS_SC_STATUS_BAD_MESSAGE;
datalen = 0;
break;
}
status = CUPS_SC_STATUS_IO_ERROR;
datalen = 0;
if (_cupsSNMPWrite(snmp_fd, addr, CUPS_SNMP_VERSION_1,
_cupsSNMPDefaultCommunity(),
command == CUPS_SC_CMD_SNMP_GET ?
CUPS_ASN1_GET_REQUEST :
CUPS_ASN1_GET_NEXT_REQUEST, 1,
packet.object_name))
{
if (_cupsSNMPRead(snmp_fd, &packet, 1.0))
{
size_t i; /* Looping var */
if (!_cupsSNMPOIDToString(packet.object_name, data, sizeof(data)))
{
fputs("DEBUG: Bad OID returned!\n", stderr);
break;
}
datalen = (int)strlen(data) + 1;
dataptr = data + datalen;
switch (packet.object_type)
{
case CUPS_ASN1_BOOLEAN :
snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%d", packet.object_value.boolean);
datalen += (int)strlen(dataptr);
break;
case CUPS_ASN1_INTEGER :
snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%d",
packet.object_value.integer);
datalen += (int)strlen(dataptr);
break;
case CUPS_ASN1_BIT_STRING :
case CUPS_ASN1_OCTET_STRING :
if (packet.object_value.string.num_bytes < (sizeof(data) - (size_t)(dataptr - data)))
i = packet.object_value.string.num_bytes;
else
i = sizeof(data) - (size_t)(dataptr - data);
memcpy(dataptr, packet.object_value.string.bytes, i);
datalen += (int)i;
break;
case CUPS_ASN1_OID :
_cupsSNMPOIDToString(packet.object_value.oid, dataptr,
sizeof(data) - (size_t)(dataptr - data));
datalen += (int)strlen(dataptr);
break;
case CUPS_ASN1_HEX_STRING :
for (i = 0;
i < packet.object_value.string.num_bytes &&
dataptr < (data + sizeof(data) - 3);
i ++, dataptr += 2)
New upstream version 2.4.2
2023-01-11 16:57:48 +08:00
snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%02X", packet.object_value.string.bytes[i]);
Import Upstream version 2.3.1
2022-05-13 20:08:20 +08:00
datalen += (int)strlen(dataptr);
break;
case CUPS_ASN1_COUNTER :
snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.counter);
datalen += (int)strlen(dataptr);
break;
case CUPS_ASN1_GAUGE :
snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.gauge);
datalen += (int)strlen(dataptr);
break;
case CUPS_ASN1_TIMETICKS :
snprintf(dataptr, sizeof(data) - (size_t)(dataptr - data), "%u", packet.object_value.timeticks);
datalen += (int)strlen(dataptr);
break;
default :
fprintf(stderr, "DEBUG: Unknown OID value type %02X.\n", packet.object_type);
case CUPS_ASN1_NULL_VALUE :
dataptr[0] = '\0';
break;
}
fprintf(stderr, "DEBUG: Returning %s %s\n", data, data + datalen);
status = CUPS_SC_STATUS_OK;
}
else
fputs("DEBUG: SNMP read error...\n", stderr);
}
else
fputs("DEBUG: SNMP write error...\n", stderr);
break;
}
status = CUPS_SC_STATUS_NOT_IMPLEMENTED;
datalen = 0;
break;
case CUPS_SC_CMD_GET_CONNECTED :
status = CUPS_SC_STATUS_OK;
data[0] = device_fd != -1;
datalen = 1;
break;
case CUPS_SC_CMD_GET_DEVICE_ID :
if (snmp_fd >= 0)
{
cups_snmp_t packet; /* Packet from printer */
static const int ppmPrinterIEEE1284DeviceId[] =
{ CUPS_OID_ppmPrinterIEEE1284DeviceId,1,-1 };
status = CUPS_SC_STATUS_IO_ERROR;
datalen = 0;
if (_cupsSNMPWrite(snmp_fd, addr, CUPS_SNMP_VERSION_1,
_cupsSNMPDefaultCommunity(),
CUPS_ASN1_GET_REQUEST, 1,
ppmPrinterIEEE1284DeviceId))
{
if (_cupsSNMPRead(snmp_fd, &packet, 1.0) &&
packet.object_type == CUPS_ASN1_OCTET_STRING)
{
strlcpy(data, (char *)packet.object_value.string.bytes,
sizeof(data));
datalen = (int)strlen(data);
status = CUPS_SC_STATUS_OK;
}
}
break;
}
if ((device_id = getenv("1284DEVICEID")) != NULL)
{
strlcpy(data, device_id, sizeof(data));
datalen = (int)strlen(data);
status = CUPS_SC_STATUS_OK;
break;
}
default :
status = CUPS_SC_STATUS_NOT_IMPLEMENTED;
datalen = 0;
break;
}
return (cupsSideChannelWrite(command, status, data, datalen, 1.0));
}