diff options
Diffstat (limited to 'backend/network.c')
| -rw-r--r-- | backend/network.c | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/backend/network.c b/backend/network.c new file mode 100644 index 0000000..d5827c4 --- /dev/null +++ b/backend/network.c @@ -0,0 +1,300 @@ +/* + * "$Id: network.c 9578 2011-03-04 18:44:47Z mike $" + * + * Common backend network APIs for CUPS. + * + * Copyright 2007-2011 by Apple Inc. + * Copyright 2006-2007 by Easy Software Products, all rights reserved. + * + * These coded instructions, statements, and computer programs are the + * property of Apple Inc. and are protected by Federal copyright + * law. Distribution and use rights are outlined in the file "LICENSE.txt" + * "LICENSE" which should have been included with this file. If this + * file is missing or damaged, see the license at "http://www.cups.org/". + * + * This file is subject to the Apple OS-Developed Software exception. + * + * Contents: + * + * backendCheckSideChannel() - Check the side-channel for pending requests. + * backendNetworkSideCB() - Handle common network side-channel commands. + */ + +/* + * Include necessary headers. + */ + +#include "backend-private.h" +#include <limits.h> +#ifdef __hpux +# include <sys/time.h> +#else +# include <sys/select.h> +#endif /* __hpux */ + + +/* + * '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); +} + + +/* + * '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[2048]; /* 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] = 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) + { + cups_snmp_t packet; /* Packet from printer */ + + + 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)) + { + char *dataptr; /* Pointer into data */ + int 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) - (dataptr - data), "%d", + packet.object_value.boolean); + datalen += (int)strlen(dataptr); + break; + + case CUPS_ASN1_INTEGER : + snprintf(dataptr, sizeof(data) - (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 < 0) + i = 0; + else if (packet.object_value.string.num_bytes < + (sizeof(data) - (dataptr - data))) + i = packet.object_value.string.num_bytes; + else + i = (int)(sizeof(data) - (dataptr - data)); + + memcpy(dataptr, packet.object_value.string.bytes, i); + + datalen += i; + break; + + case CUPS_ASN1_OID : + _cupsSNMPOIDToString(packet.object_value.oid, dataptr, + sizeof(data) - (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) - (dataptr - data), "%d", + packet.object_value.counter); + datalen += (int)strlen(dataptr); + break; + + case CUPS_ASN1_GAUGE : + snprintf(dataptr, sizeof(data) - (dataptr - data), "%u", + packet.object_value.gauge); + datalen += (int)strlen(dataptr); + break; + + case CUPS_ASN1_TIMETICKS : + snprintf(dataptr, sizeof(data) - (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_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; + } + + case CUPS_SC_CMD_GET_CONNECTED : + status = CUPS_SC_STATUS_OK; + data[0] = device_fd != -1; + datalen = 1; + break; + + default : + status = CUPS_SC_STATUS_NOT_IMPLEMENTED; + datalen = 0; + break; + } + + return (cupsSideChannelWrite(command, status, data, datalen, 1.0)); +} + + +/* + * End of "$Id: network.c 9578 2011-03-04 18:44:47Z mike $". + */ |