| /* | |
| * 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(¤t->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) | |
| sprintf(dataptr, "%02X", packet.object_value.string.bytes[i]); | |
| 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)); | |
| } |