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