/* omgssapi.c
 * This is the implementation of the build-in forwarding output module.
 *
 * NOTE: read comments in module-template.h to understand how this file
 *       works!
 *
 * Copyright 2007-2017 Rainer Gerhards and Adiscon GmbH.
 *
 * This file is part of rsyslog.
 *
 * Rsyslog 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 3 of the License, or
 * (at your option) any later version.
 *
 * Rsyslog 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 Rsyslog.  If not, see <http://www.gnu.org/licenses/>.
 *
 * A copy of the GPL can be found in the file "COPYING" in this distribution.
 */
#include "config.h"
#ifdef USE_GSSAPI
    #include "rsyslog.h"
    #include <stdio.h>
    #include <stdarg.h>
    #include <stdlib.h>
    #include <string.h>
    #include <time.h>
    #include <netinet/in.h>
    #include <netdb.h>
    #include <fnmatch.h>
    #include <assert.h>
    #include <errno.h>
    #include <ctype.h>
    #include <unistd.h>
    #include <zlib.h>
    #include <pthread.h>
    #include <gssapi/gssapi.h>
    #include "dirty.h"
    #include "conf.h"
    #include "syslogd-types.h"
    #include "srUtils.h"
    #include "net.h"
    #include "template.h"
    #include "msg.h"
    #include "cfsysline.h"
    #include "module-template.h"
    #include "gss-misc.h"
    #include "gss-token-util.h"
    #include "tcpclt.h"
    #include "glbl.h"
    #include "errmsg.h"
    #include "rsconf.h"

MODULE_TYPE_OUTPUT;
MODULE_TYPE_NOKEEP;


static rsRetVal resetConfigVariables(uchar __attribute__((unused)) * pp, void __attribute__((unused)) * pVal);
static rsRetVal setGSSTokenIOTimeout(void *pVal, int timeout_secs);

/* internal structures
 */
DEF_OMOD_STATIC_DATA;
DEFobjCurrIf(glbl) DEFobjCurrIf(gssutil) DEFobjCurrIf(tcpclt)

    typedef struct _instanceData {
    char *f_hname;
    short sock; /* file descriptor */
    enum { /* TODO: we shoud revisit these definitions */
           eDestFORW,
           eDestFORW_SUSP,
           eDestFORW_UNKN
    } eDestState;
    struct addrinfo *f_addr;
    int compressionLevel; /* 0 - no compression, else level for zlib */
    char *port;
    tcpclt_t *pTCPClt; /* our tcpclt object */
    gss_ctx_id_t gss_context;
    OM_uint32 gss_flags;
} instanceData;

typedef struct wrkrInstanceData {
    instanceData *pData;
} wrkrInstanceData_t;

/* config data */

typedef enum gss_mode_e { GSSMODE_MIC, GSSMODE_ENC } gss_mode_t;

static struct configSettings_s {
    uchar *pszTplName; /* name of the default template to use */
    char *gss_base_service_name;
    gss_mode_t gss_mode;
    int gss_token_io_timeout_secs;
} cs = {NULL, NULL, GSSMODE_ENC, GSS_TOKEN_IO_TIMEOUT_SECS};

static pthread_mutex_t mutDoAct = PTHREAD_MUTEX_INITIALIZER;

/* get the syslog forward port from selector_t. The passed in
 * struct must be one that is setup for forwarding.
 * rgerhards, 2007-06-28
 * We may change the implementation to try to lookup the port
 * if it is unspecified. So far, we use the IANA default auf 514.
 */
static const char *getFwdSyslogPt(instanceData *pData) {
    assert(pData != NULL);
    if (pData->port == NULL)
        return ("514");
    else
        return (pData->port);
}

BEGINcreateInstance
    CODESTARTcreateInstance;
ENDcreateInstance


BEGINcreateWrkrInstance
    CODESTARTcreateWrkrInstance;
ENDcreateWrkrInstance


BEGINisCompatibleWithFeature
    CODESTARTisCompatibleWithFeature;
    if (eFeat == sFEATURERepeatedMsgReduction) iRet = RS_RET_OK;
ENDisCompatibleWithFeature


BEGINfreeInstance
    OM_uint32 maj_stat, min_stat;
    CODESTARTfreeInstance;
    switch (pData->eDestState) {
        case eDestFORW:
        case eDestFORW_SUSP:
            freeaddrinfo(pData->f_addr);
            /* fall through */
        case eDestFORW_UNKN:
            if (pData->port != NULL) free(pData->port);
            break;
        default:
            break;
    }

    if (pData->gss_context != GSS_C_NO_CONTEXT) {
        maj_stat = gss_delete_sec_context(&min_stat, &pData->gss_context, GSS_C_NO_BUFFER);
        if (maj_stat != GSS_S_COMPLETE) gssutil.display_status((char *)"deleting context", maj_stat, min_stat);
    }
    /* this is meant to be done when module is unloaded,
       but since this module is static...
    */
    free(cs.gss_base_service_name);
    cs.gss_base_service_name = NULL;

    /* final cleanup */
    tcpclt.Destruct(&pData->pTCPClt);
    if (pData->sock >= 0) close(pData->sock);

    if (pData->f_hname != NULL) free(pData->f_hname);
ENDfreeInstance

BEGINfreeWrkrInstance
    CODESTARTfreeWrkrInstance;
ENDfreeWrkrInstance

BEGINdbgPrintInstInfo
    CODESTARTdbgPrintInstInfo;
    printf("%s", pData->f_hname);
ENDdbgPrintInstInfo


/* This function is called immediately before a send retry is attempted.
 * It shall clean up whatever makes sense.
 * rgerhards, 2007-12-28
 */
static rsRetVal TCPSendGSSPrepRetry(void __attribute__((unused)) * pData) {
    /* in case of TCP/GSS, there is nothing to do */
    return RS_RET_OK;
}


static rsRetVal TCPSendGSSInit(void *pvData) {
    DEFiRet;
    int s = -1;
    const char *base;
    OM_uint32 maj_stat, min_stat, init_sec_min_stat, *sess_flags, ret_flags;
    gss_buffer_desc out_tok, in_tok;
    gss_buffer_t tok_ptr;
    gss_name_t target_name;
    gss_ctx_id_t *context;
    instanceData *pData = (instanceData *)pvData;

    assert(pData != NULL);

    /* if the socket is already initialized, we are done */
    if (pData->sock > 0) ABORT_FINALIZE(RS_RET_OK);

    base = (cs.gss_base_service_name == NULL) ? "host" : cs.gss_base_service_name;
    out_tok.length = strlen(pData->f_hname) + strlen(base) + 2;
    CHKmalloc(out_tok.value = malloc(out_tok.length));
    memcpy(out_tok.value, base, strlen(base));
    ((char *)out_tok.value)[strlen(base)] = '@';
    memcpy((char *)out_tok.value + strlen(base) + 1, pData->f_hname, strlen(pData->f_hname) + 1);
    dbgprintf("GSS-API service name: %s\n", (char *)out_tok.value);

    tok_ptr = GSS_C_NO_BUFFER;
    context = &pData->gss_context;
    *context = GSS_C_NO_CONTEXT;

    maj_stat = gss_import_name(&min_stat, &out_tok, GSS_C_NT_HOSTBASED_SERVICE, &target_name);
    free(out_tok.value);
    out_tok.value = NULL;
    out_tok.length = 0;

    if (maj_stat != GSS_S_COMPLETE) {
        gssutil.display_status((char *)"parsing name", maj_stat, min_stat);
        goto fail;
    }

    sess_flags = &pData->gss_flags;
    *sess_flags = GSS_C_MUTUAL_FLAG;
    if (cs.gss_mode == GSSMODE_MIC) {
        *sess_flags |= GSS_C_INTEG_FLAG;
    }
    if (cs.gss_mode == GSSMODE_ENC) {
        *sess_flags |= GSS_C_CONF_FLAG;
    }
    dbgprintf("GSS-API requested context flags:\n");
    gssutil.display_ctx_flags(*sess_flags);

    do {
        maj_stat = gss_init_sec_context(&init_sec_min_stat, GSS_C_NO_CREDENTIAL, context, target_name, GSS_C_NO_OID,
                                        *sess_flags, 0, NULL, tok_ptr, NULL, &out_tok, &ret_flags, NULL);
        if (tok_ptr != GSS_C_NO_BUFFER) free(in_tok.value);

        if (maj_stat != GSS_S_COMPLETE && maj_stat != GSS_S_CONTINUE_NEEDED) {
            gssutil.display_status((char *)"initializing context", maj_stat, init_sec_min_stat);
            goto fail;
        }

        if (s == -1)
            if ((s = pData->sock = tcpclt.CreateSocket(pData->f_addr)) == -1) goto fail;

        if (out_tok.length != 0) {
            dbgprintf("GSS-API Sending init_sec_context token (length: %ld)\n", (long)out_tok.length);
            if (gssutil.send_token(s, &out_tok) < 0) {
                goto fail;
            }
        }
        gss_release_buffer(&min_stat, &out_tok);

        if (maj_stat == GSS_S_CONTINUE_NEEDED) {
            dbgprintf("GSS-API Continue needed...\n");
            if (gssutil.recv_token(s, &in_tok, GSS_TOKEN_MAX_HANDSHAKE_BYTES,
                                   (unsigned int)cs.gss_token_io_timeout_secs) <= 0) {
                goto fail;
            }
            tok_ptr = &in_tok;
        }
    } while (maj_stat == GSS_S_CONTINUE_NEEDED);

    dbgprintf("GSS-API Provided context flags:\n");
    *sess_flags = ret_flags;
    gssutil.display_ctx_flags(*sess_flags);

    dbgprintf("GSS-API Context initialized\n");
    gss_release_name(&min_stat, &target_name);

finalize_it:
    RETiRet;

fail:
    LogError(0, RS_RET_GSS_SENDINIT_ERROR, "GSS-API Context initialization failed\n");
    gss_release_name(&min_stat, &target_name);
    gss_release_buffer(&min_stat, &out_tok);
    if (*context != GSS_C_NO_CONTEXT) {
        gss_delete_sec_context(&min_stat, context, GSS_C_NO_BUFFER);
        *context = GSS_C_NO_CONTEXT;
    }
    if (s != -1) close(s);
    pData->sock = -1;
    ABORT_FINALIZE(RS_RET_GSS_SENDINIT_ERROR);
}


static rsRetVal TCPSendGSSSend(void *pvData, char *msg, size_t len) {
    int s;
    gss_ctx_id_t *context;
    OM_uint32 maj_stat, min_stat;
    gss_buffer_desc in_buf, out_buf;
    instanceData *pData = (instanceData *)pvData;

    assert(pData != NULL);
    assert(msg != NULL);
    assert(len > 0);

    s = pData->sock;
    context = &pData->gss_context;
    in_buf.value = msg;
    in_buf.length = len;
    maj_stat =
        gss_wrap(&min_stat, *context, (cs.gss_mode == GSSMODE_ENC) ? 1 : 0, GSS_C_QOP_DEFAULT, &in_buf, NULL, &out_buf);
    if (maj_stat != GSS_S_COMPLETE) {
        gssutil.display_status((char *)"wrapping message", maj_stat, min_stat);
        goto fail;
    }

    if (gssutil.send_token(s, &out_buf) < 0) {
        goto fail;
    }
    gss_release_buffer(&min_stat, &out_buf);

    return RS_RET_OK;

fail:
    close(s);
    pData->sock = -1;
    gss_delete_sec_context(&min_stat, context, GSS_C_NO_BUFFER);
    *context = GSS_C_NO_CONTEXT;
    gss_release_buffer(&min_stat, &out_buf);
    dbgprintf("message not (GSS/tcp)send");
    return RS_RET_GSS_SEND_ERROR;
}


/* try to resume connection if it is not ready
 * rgerhards, 2007-08-02
 */
static rsRetVal doTryResume(instanceData *pData) {
    DEFiRet;
    struct addrinfo *res;
    struct addrinfo hints;

    switch (pData->eDestState) {
        case eDestFORW_SUSP:
            iRet = RS_RET_OK; /* the actual check happens during doAction() only */
            pData->eDestState = eDestFORW;
            break;

        case eDestFORW_UNKN:
            /* The remote address is not yet known and needs to be obtained */
            dbgprintf(" %s\n", pData->f_hname);
            memset(&hints, 0, sizeof(hints));
            /* port must be numeric, because config file syntax requests this */
            /* TODO: this code is a duplicate from cfline() - we should later create
             * a common function.
             */
            hints.ai_flags = AI_NUMERICSERV;
            hints.ai_family = glbl.GetDefPFFamily(runConf);
            hints.ai_socktype = SOCK_STREAM;
            if (getaddrinfo(pData->f_hname, getFwdSyslogPt(pData), &hints, &res) == 0) {
                dbgprintf("%s found, resuming.\n", pData->f_hname);
                pData->f_addr = res;
                pData->eDestState = eDestFORW;
            } else {
                iRet = RS_RET_SUSPENDED;
            }
            break;
        case eDestFORW:
            /* NOOP */
            break;
        default:
            break;
    }

    RETiRet;
}


BEGINtryResume
    CODESTARTtryResume;
    pthread_mutex_lock(&mutDoAct);
    iRet = doTryResume(pWrkrData->pData);
    pthread_mutex_unlock(&mutDoAct);
ENDtryResume

BEGINdoAction
    char *psz = NULL; /* temporary buffering */
    register unsigned l;
    int iMaxLine;
    instanceData *pData;
    CODESTARTdoAction;
    pthread_mutex_lock(&mutDoAct);
    pData = pWrkrData->pData;
    switch (pData->eDestState) {
        case eDestFORW_SUSP:
            dbgprintf("internal error in omgssapi.c, eDestFORW_SUSP in doAction()!\n");
            iRet = RS_RET_SUSPENDED;
            break;

        case eDestFORW_UNKN:
            dbgprintf("doAction eDestFORW_UNKN\n");
            iRet = doTryResume(pData);
            break;

        case eDestFORW:
            dbgprintf(" %s:%s/%s\n", pData->f_hname, getFwdSyslogPt(pData), "tcp-gssapi");
            iMaxLine = glbl.GetMaxLine(runConf);
            psz = (char *)ppString[0];
            l = strlen((char *)psz);
            if ((int)l > iMaxLine) l = iMaxLine;

            /* Check if we should compress and, if so, do it. We also
             * check if the message is large enough to justify compression.
             * The smaller the message, the less likely is a gain in compression.
             * To save CPU cycles, we do not try to compress very small messages.
             * What "very small" means needs to be configured. Currently, it is
             * hard-coded but this may be changed to a config parameter.
             * rgerhards, 2006-11-30
             */
            if (pData->compressionLevel && (l > CONF_MIN_SIZE_FOR_COMPRESS)) {
                Bytef *out;
                uLongf destLen = iMaxLine + iMaxLine / 100 + 12; /* recommended value from zlib doc */
                uLong srcLen = l;
                int ret;
                /* TODO: optimize malloc sequence? -- rgerhards, 2008-09-02 */
                CHKmalloc(out = (Bytef *)malloc(iMaxLine + iMaxLine / 100 + 12));
                out[0] = 'z';
                out[1] = '\0';
                ret = compress2((Bytef *)out + 1, &destLen, (Bytef *)psz, srcLen, pData->compressionLevel);
                dbgprintf("Compressing message, length was %d now %d, return state  %d.\n", l, (int)destLen, ret);
                if (ret != Z_OK) {
                    /* if we fail, we complain, but only in debug mode
                     * Otherwise, we are silent. In any case, we ignore the
                     * failed compression and just sent the uncompressed
                     * data, which is still valid. So this is probably the
                     * best course of action.
                     * rgerhards, 2006-11-30
                     */
                    dbgprintf("Compression failed, sending uncompressed message\n");
                    free(out);
                } else if (destLen + 1 < l) {
                    /* only use compression if there is a gain in using it! */
                    dbgprintf("there is gain in compression, so we do it\n");
                    psz = (char *)out;
                    l = destLen + 1; /* take care for the "z" at message start! */
                } else {
                    free(out);
                }
                ++destLen;
            }

            CHKiRet_Hdlr(tcpclt.Send(pData->pTCPClt, pData, psz, l)) {
                /* error! */
                dbgprintf("error forwarding via tcp, suspending\n");
                pData->eDestState = eDestFORW_SUSP;
                ABORT_FINALIZE(RS_RET_SUSPENDED);
            }
            break;
        default:
            break;
    }
finalize_it:
    if ((psz != NULL) && (psz != (char *)ppString[0])) {
        /* we need to free temporary buffer, alloced above - Naoya Nakazawa, 2010-01-11 */
        free(psz);
    }
    pthread_mutex_unlock(&mutDoAct);
ENDdoAction


BEGINparseSelectorAct
    uchar *q;
    int i;
    int bErr;
    struct addrinfo hints, *res;
    TCPFRAMINGMODE tcp_framing = TCP_FRAMING_OCTET_STUFFING;
    CODESTARTparseSelectorAct;
    CODE_STD_STRING_REQUESTparseSelectorAct(1)
        /* first check if this config line is actually for us
         * The first test [*p == '>'] can be skipped if a module shall only
         * support the newer slection syntax [:modname:]. This is in fact
         * recommended for new modules. Please note that over time this part
         * will be handled by rsyslogd itself, but for the time being it is
         * a good compromise to do it at the module level.
         * rgerhards, 2007-10-15
         */

        if (!strncmp((char *)p, ":omgssapi:", sizeof(":omgssapi:") - 1)) {
        p += sizeof(":omgssapi:") - 1; /* eat indicator sequence (-1 because of '\0'!) */
    }
    else {
        ABORT_FINALIZE(RS_RET_CONFLINE_UNPROCESSED);
    }

    /* ok, if we reach this point, we have something for us */
    if ((iRet = createInstance(&pData)) != RS_RET_OK) goto finalize_it;

    /* we are now after the protocol indicator. Now check if we should
     * use compression. We begin to use a new option format for this:
     * @(option,option)host:port
     * The first option defined is "z[0..9]" where the digit indicates
     * the compression level. If it is not given, 9 (best compression) is
     * assumed. An example action statement might be:
     * @@(z5,o)127.0.0.1:1400
     * Which means send via TCP with medium (5) compresion (z) to the local
     * host on port 1400. The '0' option means that octet-couting (as in
     * IETF I-D syslog-transport-tls) is to be used for framing (this option
     * applies to TCP-based syslog only and is ignored when specified with UDP).
     * That is not yet implemented.
     * rgerhards, 2006-12-07
     */
    if (*p == '(') {
        /* at this position, it *must* be an option indicator */
        do {
            ++p; /* eat '(' or ',' (depending on when called) */
            /* check options */
            if (*p == 'z') { /* compression */
                ++p; /* eat */
                if (isdigit((int)*p)) {
                    int iLevel;
                    iLevel = *p - '0';
                    ++p; /* eat */
                    pData->compressionLevel = iLevel;
                } else {
                    LogError(0, NO_ERRCODE,
                             "Invalid compression level '%c' specified in "
                             "forwarding action - NOT turning on compression.",
                             *p);
                }
            } else if (*p == 'o') { /* octet-couting based TCP framing? */
                ++p; /* eat */
                /* no further options settable */
                tcp_framing = TCP_FRAMING_OCTET_COUNTING;
            } else { /* invalid option! Just skip it... */
                LogError(0, NO_ERRCODE,
                         "Invalid option %c in forwarding action - "
                         "ignoring.",
                         *p);
                ++p; /* eat invalid option */
            }
            /* the option processing is done. We now do a generic skip
             * to either the next option or the end of the option
             * block.
             */
            while (*p && *p != ')' && *p != ',') ++p; /* just skip it */
        } while (*p && *p == ','); /* Attention: do.. while() */
        if (*p == ')')
            ++p; /* eat terminator, on to next */
        else
            /* we probably have end of string - leave it for the rest
             * of the code to handle it (but warn the user)
             */
            LogError(0, NO_ERRCODE, "Option block not terminated in gssapi forward action.");
    }
    /* extract the host first (we do a trick - we replace the ';' or ':' with a '\0')
     * now skip to port and then template name. rgerhards 2005-07-06
     */
    for (q = p; *p && *p != ';' && *p != ':' && *p != '#'; ++p) /* JUST SKIP */
        ;

    pData->port = NULL;
    if (*p == ':') { /* process port */
        uchar *tmp;

        *p = '\0'; /* trick to obtain hostname (later)! */
        tmp = ++p;
        for (i = 0; *p && isdigit((int)*p); ++p, ++i) /* SKIP AND COUNT */
            ;
        pData->port = malloc(i + 1);
        if (pData->port == NULL) {
            LogError(0, NO_ERRCODE,
                     "Could not get memory to store syslog forwarding port, "
                     "using default port, results may not be what you intend\n");
            /* we leave f_forw.port set to NULL, this is then handled by
             * getFwdSyslogPt().
             */
        } else {
            memcpy(pData->port, tmp, i);
            *(pData->port + i) = '\0';
        }
    }


    /* now skip to template */
    bErr = 0;
    while (*p && *p != ';') {
        if (*p && *p != ';' && !isspace((int)*p)) {
            if (bErr == 0) { /* only 1 error msg! */
                bErr = 1;
                errno = 0;
                LogError(0, NO_ERRCODE,
                         "invalid selector line (port), probably not doing "
                         "what was intended");
            }
        }
        ++p;
    }

    /* TODO: make this if go away! */
    if (*p == ';' || *p == '#' || isspace(*p)) {
        uchar cTmp = *p;
        *p = '\0'; /* trick to obtain hostname (later)! */
        CHKmalloc(pData->f_hname = strdup((char *)q));
        *p = cTmp;
    } else {
        CHKmalloc(pData->f_hname = strdup((char *)q));
    }

    /* process template */
    CHKiRet(
        cflineParseTemplateName(&p, *ppOMSR, 0, OMSR_NO_RQD_TPL_OPTS,
                                (cs.pszTplName == NULL) ? (uchar *)"RSYSLOG_TraditionalForwardFormat" : cs.pszTplName));

    /* first set the pData->eDestState */
    memset(&hints, 0, sizeof(hints));
    /* port must be numeric, because config file syntax requests this */
    hints.ai_flags = AI_NUMERICSERV;
    hints.ai_family = glbl.GetDefPFFamily(loadConf);
    hints.ai_socktype = SOCK_STREAM;
    if (getaddrinfo(pData->f_hname, getFwdSyslogPt(pData), &hints, &res) != 0) {
        pData->eDestState = eDestFORW_UNKN;
    } else {
        pData->eDestState = eDestFORW;
        pData->f_addr = res;
    }

    /* now create our tcpclt */
    CHKiRet(tcpclt.Construct(&pData->pTCPClt));
    /* and set callbacks */
    CHKiRet(tcpclt.SetSendInit(pData->pTCPClt, TCPSendGSSInit));
    CHKiRet(tcpclt.SetSendFrame(pData->pTCPClt, TCPSendGSSSend));
    CHKiRet(tcpclt.SetSendPrepRetry(pData->pTCPClt, TCPSendGSSPrepRetry));
    CHKiRet(tcpclt.SetFraming(pData->pTCPClt, tcp_framing));

    /* TODO: do we need to call freeInstance if we failed - this is a general question for
     * all output modules. I'll address it lates as the interface evolves. rgerhards, 2007-07-25
     */
    CODE_STD_FINALIZERparseSelectorAct
ENDparseSelectorAct


BEGINmodExit
    CODESTARTmodExit;
    objRelease(glbl, CORE_COMPONENT);
    objRelease(gssutil, LM_GSSUTIL_FILENAME);
    objRelease(tcpclt, LM_TCPCLT_FILENAME);

    if (cs.pszTplName != NULL) {
        free(cs.pszTplName);
        cs.pszTplName = NULL;
    }
ENDmodExit


BEGINqueryEtryPt
    CODESTARTqueryEtryPt;
    CODEqueryEtryPt_STD_OMOD_QUERIES;
    CODEqueryEtryPt_STD_OMOD8_QUERIES;
ENDqueryEtryPt


/* set a new GSSMODE based on config directive */
static rsRetVal setGSSMode(void __attribute__((unused)) * pVal, uchar *mode) {
    DEFiRet;

    if (!strcmp((char *)mode, "integrity")) {
        cs.gss_mode = GSSMODE_MIC;
        dbgprintf("GSS-API gssmode set to GSSMODE_MIC\n");
    } else if (!strcmp((char *)mode, "encryption")) {
        cs.gss_mode = GSSMODE_ENC;
        dbgprintf("GSS-API gssmode set to GSSMODE_ENC\n");
    } else {
        LogError(0, RS_RET_INVALID_PARAMS, "unknown gssmode parameter: %s", (char *)mode);
        iRet = RS_RET_INVALID_PARAMS;
    }
    free(mode);

    RETiRet;
}


static rsRetVal resetConfigVariables(uchar __attribute__((unused)) * pp, void __attribute__((unused)) * pVal) {
    cs.gss_mode = GSSMODE_ENC;
    cs.gss_token_io_timeout_secs = GSS_TOKEN_IO_TIMEOUT_SECS;
    free(cs.gss_base_service_name);
    cs.gss_base_service_name = NULL;
    free(cs.pszTplName);
    cs.pszTplName = NULL;
    return RS_RET_OK;
}


static rsRetVal setGSSTokenIOTimeout(void __attribute__((unused)) * pVal, int timeout_secs) {
    if (timeout_secs < 0) {
        LogError(0, RS_RET_PARAM_ERROR, "omgssapi: $GssTokenIOTimeout must be greater than or equal to 0");
        return RS_RET_PARAM_ERROR;
    }

    cs.gss_token_io_timeout_secs = timeout_secs;
    return RS_RET_OK;
}


BEGINmodInit()
    CODESTARTmodInit;
    *ipIFVersProvided = CURR_MOD_IF_VERSION; /* we only support the current interface specification */
    CODEmodInit_QueryRegCFSLineHdlr CHKiRet(objUse(glbl, CORE_COMPONENT));
    CHKiRet(objUse(gssutil, LM_GSSUTIL_FILENAME));
    CHKiRet(objUse(tcpclt, LM_TCPCLT_FILENAME));

    CHKiRet(omsdRegCFSLineHdlr((uchar *)"gssforwardservicename", 0, eCmdHdlrGetWord, NULL, &cs.gss_base_service_name,
                               STD_LOADABLE_MODULE_ID));
    CHKiRet(
        omsdRegCFSLineHdlr((uchar *)"gssmode", 0, eCmdHdlrGetWord, setGSSMode, &cs.gss_mode, STD_LOADABLE_MODULE_ID));
    CHKiRet(omsdRegCFSLineHdlr((uchar *)"gsstokeniotimeout", 0, eCmdHdlrInt, setGSSTokenIOTimeout, NULL,
                               STD_LOADABLE_MODULE_ID));
    CHKiRet(omsdRegCFSLineHdlr((uchar *)"actiongssforwarddefaulttemplate", 0, eCmdHdlrGetWord, NULL, &cs.pszTplName,
                               STD_LOADABLE_MODULE_ID));
    CHKiRet(omsdRegCFSLineHdlr((uchar *)"resetconfigvariables", 1, eCmdHdlrCustomHandler, resetConfigVariables, NULL,
                               STD_LOADABLE_MODULE_ID));
ENDmodInit

#endif /* #ifdef USE_GSSAPI */
/* vi:set ai:
 */
