C++ paircreate函数代码示例

static int eap_sim_sendstart(eap_handler_t *handler)
{
	VALUE_PAIR **vps, *newvp;
	uint16_t words[3];
	eap_sim_state_t *ess;
	RADIUS_PACKET *packet;
	uint8_t *p;

	rad_assert(handler->request != NULL);
	rad_assert(handler->request->reply);

	ess = (eap_sim_state_t *)handler->opaque;

	/* these are the outgoing attributes */
	packet = handler->request->reply;
	vps = &packet->vps;
	rad_assert(vps != NULL);


	/*
	 *	Add appropriate TLVs for the EAP things we wish to send.
	 */

	/* the version list. We support only version 1. */
	words[0] = htons(sizeof(words[1]));
	words[1] = htons(EAP_SIM_VERSION);
	words[2] = 0;

	newvp = paircreate(packet, PW_EAP_SIM_VERSION_LIST, 0);
	pairmemcpy(newvp, (uint8_t const *) words, sizeof(words));

	pairadd(vps, newvp);

	/* set the EAP_ID - new value */
	newvp = paircreate(packet, PW_EAP_ID, 0);
	newvp->vp_integer = ess->sim_id++;
	pairreplace(vps, newvp);

	/* record it in the ess */
	ess->keys.versionlistlen = 2;
	memcpy(ess->keys.versionlist, words + 1, ess->keys.versionlistlen);

	/* the ANY_ID attribute. We do not support re-auth or pseudonym */
	newvp = paircreate(packet, PW_EAP_SIM_FULLAUTH_ID_REQ, 0);
	newvp->length = 2;
	newvp->vp_octets = p = talloc_array(newvp, uint8_t, 2);

	p[0] = 0;
	p[0] = 1;
	pairadd(vps, newvp);

	/* the SUBTYPE, set to start. */
	newvp = paircreate(packet, PW_EAP_SIM_SUBTYPE, 0);
	newvp->vp_integer = EAPSIM_START;
	pairreplace(vps, newvp);

	return 1;
}

static int eap_sim_sendstart(EAP_HANDLER *handler)
{
	VALUE_PAIR **vps, *newvp;
	uint16_t *words;
	struct eap_sim_server_state *ess;

	rad_assert(handler->request != NULL);
	rad_assert(handler->request->reply);

	ess = (struct eap_sim_server_state *)handler->opaque;

	/* these are the outgoing attributes */
	vps = &handler->request->reply->vps;

	rad_assert(vps != NULL);

	/*
	 * add appropriate TLVs for the EAP things we wish to send.
	 */

	/* the version list. We support only version 1. */
	newvp = paircreate(ATTRIBUTE_EAP_SIM_BASE+PW_EAP_SIM_VERSION_LIST, 0,
			   PW_TYPE_OCTETS);
	words = (uint16_t *)newvp->vp_strvalue;
	newvp->length = 3*sizeof(uint16_t);
	words[0] = htons(1*sizeof(uint16_t));
	words[1] = htons(EAP_SIM_VERSION);
	words[2] = 0;
	pairadd(vps, newvp);

	/* set the EAP_ID - new value */
	newvp = paircreate(ATTRIBUTE_EAP_ID, 0, PW_TYPE_INTEGER);
	newvp->vp_integer = ess->sim_id++;
	pairreplace(vps, newvp);

	/* record it in the ess */
	ess->keys.versionlistlen = 2;
	memcpy(ess->keys.versionlist, words+1, ess->keys.versionlistlen);

	/* the ANY_ID attribute. We do not support re-auth or pseudonym */
	newvp = paircreate(ATTRIBUTE_EAP_SIM_BASE+PW_EAP_SIM_FULLAUTH_ID_REQ,
			   0, PW_TYPE_OCTETS);
	newvp->length = 2;
	newvp->vp_strvalue[0]=0;
	newvp->vp_strvalue[0]=1;
	pairadd(vps, newvp);

	/* the SUBTYPE, set to start. */
	newvp = paircreate(ATTRIBUTE_EAP_SIM_SUBTYPE, 0, PW_TYPE_INTEGER);
	newvp->vp_integer = eapsim_start;
	pairreplace(vps, newvp);

	return 1;
}

/** Add a module failure message VALUE_PAIR to the request
 */
void module_failure_msg(REQUEST *request, char const *fmt, ...)
{
	va_list ap;
	char *p;
	VALUE_PAIR *vp;

	if (!fmt || !request->packet) {
		va_start(ap, fmt);
		va_end(ap);
		return;
	}

	va_start(ap, fmt);
	vp = paircreate(request->packet, PW_MODULE_FAILURE_MESSAGE, 0);
	if (!vp) {
		va_end(ap);
		return;
	}

	p = talloc_vasprintf(vp, fmt, ap);

	if (request->module && *request->module) {
		pairsprintf(vp, "%s: %s", request->module, p);
	} else {
		pairsprintf(vp, "%s", p);
	}
	talloc_free(p);
	pairadd(&request->packet->vps, vp);
}

VALUE_PAIR *eap_packet2vp(RADIUS_PACKET *packet, const eap_packet_raw_t *eap)
{
	int		total, size;
	const uint8_t	*ptr;
	VALUE_PAIR	*head = NULL;
	VALUE_PAIR	**tail = &head;
	VALUE_PAIR	*vp;

	total = eap->length[0] * 256 + eap->length[1];

	ptr = (const uint8_t *) eap;

	do {
		size = total;
		if (size > 253) size = 253;

		vp = paircreate(packet, PW_EAP_MESSAGE, 0);
		if (!vp) {
			pairfree(&head);
			return NULL;
		}
		memcpy(vp->vp_octets, ptr, size);
		vp->length = size;

		*tail = vp;
		tail = &(vp->next);

		ptr += size;
		total -= size;
	} while (total > 0);

	return head;
}

VALUE_PAIR *eap_packet2vp(const eap_packet_t *packet)
{
	int		total, size;
	const uint8_t	*ptr;
	VALUE_PAIR	*head = NULL;
	VALUE_PAIR	**tail = &head;
	VALUE_PAIR	*vp;

	total = packet->length[0] * 256 + packet->length[1];

	ptr = (const uint8_t *) packet;

	do {
		size = total;
		if (size > 253) size = 253;

		vp = paircreate(PW_EAP_MESSAGE, PW_TYPE_OCTETS);
		if (!vp) {
			pairfree(&head);
			return NULL;
		}
		memcpy(vp->vp_octets, ptr, size);
		vp->length = size;

		*tail = vp;
		tail = &(vp->next);

		ptr += size;
		total -= size;
	} while (total > 0);

	return head;
}

/*
 *	Merge a cached entry into a REQUEST.
 */
static void cache_merge(rlm_cache_t *inst, REQUEST *request,
			rlm_cache_entry_t *c)
{
	VALUE_PAIR *vp;

	rad_assert(request != NULL);
	rad_assert(c != NULL);

	if (c->control) {
		vp = paircopy(c->control);
		pairmove(&request->config_items, &vp);
		pairfree(&vp);
	}

	if (c->request && request->packet) {
		vp = paircopy(c->request);
		pairmove(&request->packet->vps, &vp);
		pairfree(&vp);
	}

	if (c->reply && request->reply) {
		vp = paircopy(c->reply);
		pairmove(&request->reply->vps, &vp);
		pairfree(&vp);
	}
	
	if (inst->stats) {
		vp = paircreate(PW_CACHE_ENTRY_HITS, 0, PW_TYPE_INTEGER);
		rad_assert(vp != NULL);
		
		vp->vp_integer = c->hits;

		pairadd(&request->packet->vps, vp);
	}
}

static int eap_req2vp(EAP_HANDLER *handler)
{
	int		encoded, total, size;
	const uint8_t	*ptr;
	VALUE_PAIR	*head = NULL;
	VALUE_PAIR	**tail = &head;
	VALUE_PAIR	*vp;

	ptr = wpabuf_head(handler->server_ctx.eap_if->eapReqData);
	encoded = total = wpabuf_len(handler->server_ctx.eap_if->eapReqData);

	do {
		size = total;
		if (size > 253) size = 253;

		vp = paircreate(PW_EAP_MESSAGE, PW_TYPE_OCTETS);
		if (!vp) {
			pairfree(&head);
			return -1;
		}
		memcpy(vp->vp_octets, ptr, size);
		vp->length = size;

		*tail = vp;
		tail = &(vp->next);

		ptr += size;
		total -= size;
	} while (total > 0);

	pairdelete(&handler->request->reply->vps, PW_EAP_MESSAGE, TAG_ANY);
	pairadd(&handler->request->reply->vps, head);

	return encoded;
}

/*
 *	compose EAP reply packet in EAP-Message attr of RADIUS.  If
 *	EAP exceeds 253, frame it in multiple EAP-Message attrs.
 */
int eap_basic_compose(RADIUS_PACKET *packet, eap_packet_t *reply)
{
	VALUE_PAIR *vp;
	eap_packet_raw_t *eap_packet;
	int rcode;

	if (eap_wireformat(reply) == EAP_INVALID) {
		return RLM_MODULE_INVALID;
	}
	eap_packet = (eap_packet_raw_t *)reply->packet;

	pairdelete(&(packet->vps), PW_EAP_MESSAGE, 0, TAG_ANY);

	vp = eap_packet2vp(packet, eap_packet);
	if (!vp) return RLM_MODULE_INVALID;
	pairadd(&(packet->vps), vp);

	/*
	 *	EAP-Message is always associated with
	 *	Message-Authenticator but not vice-versa.
	 *
	 *	Don't add a Message-Authenticator if it's already
	 *	there.
	 */
	vp = pairfind(packet->vps, PW_MESSAGE_AUTHENTICATOR, 0, TAG_ANY);
	if (!vp) {
		vp = paircreate(packet, PW_MESSAGE_AUTHENTICATOR, 0);
		vp->vp_length = AUTH_VECTOR_LEN;
		vp->vp_octets = talloc_zero_array(vp, uint8_t, vp->vp_length);

		pairadd(&(packet->vps), vp);
	}

	/* Set request reply code, but only if it's not already set. */
	rcode = RLM_MODULE_OK;
	if (!packet->code) switch (reply->code) {
	case PW_EAP_RESPONSE:
	case PW_EAP_SUCCESS:
		packet->code = PW_CODE_ACCESS_ACCEPT;
		rcode = RLM_MODULE_HANDLED;
		break;
	case PW_EAP_FAILURE:
		packet->code = PW_CODE_ACCESS_REJECT;
		rcode = RLM_MODULE_REJECT;
		break;
	case PW_EAP_REQUEST:
		packet->code = PW_CODE_ACCESS_CHALLENGE;
		rcode = RLM_MODULE_HANDLED;
		break;
	default:
		/* Should never enter here */
		ERROR("rlm_eap: reply code %d is unknown, Rejecting the request.", reply->code);
		packet->code = PW_CODE_ACCESS_REJECT;
		break;
	}

	return rcode;
}

static rlm_rcode_t mod_post_auth(UNUSED void * instance, REQUEST *request)
{
#ifdef WITH_DHCP
	int rcode;
	VALUE_PAIR *vp;

	vp = pairfind(request->packet->vps, 43, DHCP_MAGIC_VENDOR, TAG_ANY);
	if (vp) {
		/*
		 * vendor-specific options contain
		 *
		 * vendor opt 220/0xdc - SoH payload, or null byte to probe, or string
		 * "NAP" to indicate server-side support for SoH in OFFERs
		 *
		 * vendor opt 222/0xde - SoH correlation ID as utf-16 string, yuck...
		 */
		uint8_t vopt, vlen, *data;

		data = vp->vp_octets;
		while (data < vp->vp_octets + vp->length) {
			vopt = *data++;
			vlen = *data++;
			switch (vopt) {
				case 220:
					if (vlen <= 1) {
						RDEBUG("SoH adding NAP marker to DHCP reply");
						/* client probe; send "NAP" in the reply */
						vp = paircreate(request->reply, 43, DHCP_MAGIC_VENDOR);
						vp->vp_octets[0] = 220;
						vp->vp_octets[1] = 3;
						vp->vp_octets[4] = 'N';
						vp->vp_octets[3] = 'A';
						vp->vp_octets[2] = 'P';
						vp->length = 5;

						pairadd(&request->reply->vps, vp);

					} else {
						RDEBUG("SoH decoding NAP from DHCP request");
						/* SoH payload */
						rcode = soh_verify(request, data, vlen);
						if (rcode < 0) {
							return RLM_MODULE_FAIL;
						}
					}
					break;
				default:
					/* nothing to do */
					break;
			}
			data += vlen;
		}
		return RLM_MODULE_OK;
	}
#endif
	return RLM_MODULE_NOOP;
}

/*
 *	compose EAP reply packet in EAP-Message attr of RADIUS.  If
 *	EAP exceeds 253, frame it in multiple EAP-Message attrs.
 */
int eap_basic_compose(RADIUS_PACKET *packet, EAP_PACKET *reply)
{
	VALUE_PAIR *vp;
	eap_packet_t *eap_packet;
	int rcode;

	if (eap_wireformat(reply) == EAP_INVALID) {
		return RLM_MODULE_INVALID;
	}
	eap_packet = (eap_packet_t *)reply->packet;

	pairdelete(&(packet->vps), PW_EAP_MESSAGE);

	vp = eap_packet2vp(eap_packet);
	if (!vp) return RLM_MODULE_INVALID;
	pairadd(&(packet->vps), vp);

	/*
	 *	EAP-Message is always associated with
	 *	Message-Authenticator but not vice-versa.
	 *
	 *	Don't add a Message-Authenticator if it's already
	 *	there.
	 */
	vp = pairfind(packet->vps, PW_MESSAGE_AUTHENTICATOR);
	if (!vp) {
		vp = paircreate(PW_MESSAGE_AUTHENTICATOR, PW_TYPE_OCTETS);
		memset(vp->vp_strvalue, 0, AUTH_VECTOR_LEN);
		vp->length = AUTH_VECTOR_LEN;
		pairadd(&(packet->vps), vp);
	}

	/* Set request reply code, but only if it's not already set. */
	rcode = RLM_MODULE_OK;
	if (!packet->code) switch(reply->code) {
	case PW_EAP_RESPONSE:
	case PW_EAP_SUCCESS:
		packet->code = PW_AUTHENTICATION_ACK;
		rcode = RLM_MODULE_HANDLED;
		break;
	case PW_EAP_FAILURE:
		packet->code = PW_AUTHENTICATION_REJECT;
		rcode = RLM_MODULE_REJECT;
		break;
	case PW_EAP_REQUEST:
		packet->code = PW_ACCESS_CHALLENGE;
		rcode = RLM_MODULE_HANDLED;
		break;
	default:
		/* Should never enter here */
		packet->code = PW_AUTHENTICATION_REJECT;
		break;
	}

	return rcode;
}

static int mschapv1_encode(RADIUS_PACKET *packet, VALUE_PAIR **request,
                           char const *password)
{
    unsigned int i;
    uint8_t *p;
    VALUE_PAIR *challenge, *response;
    uint8_t nthash[16];

    challenge = paircreate(packet, PW_MSCHAP_CHALLENGE, VENDORPEC_MICROSOFT);
    if (!challenge) {
        fprintf(stderr, "GOT IT %d!\n", __LINE__);
        return 0;
    }

    pairadd(request, challenge);
    challenge->length = 8;
    challenge->vp_octets = p = talloc_array(challenge, uint8_t, challenge->length);
    for (i = 0; i < challenge->length; i++) {
        p[i] = fr_rand();
    }

    response = paircreate(packet, PW_MSCHAP_RESPONSE, VENDORPEC_MICROSOFT);
    if (!response) {
        fprintf(stderr, "GOT IT %d!\n", __LINE__);
        return 0;
    }

    pairadd(request, response);
    response->length = 50;
    response->vp_octets = p = talloc_array(response, uint8_t, response->length);
    memset(p, 0, response->length);

    p[1] = 0x01; /* NT hash */

    mschap_ntpwdhash(nthash, password);

    smbdes_mschap(nthash, challenge->vp_octets,
                  p + 26);
    return 1;
}

/*
 *	Merge a cached entry into a REQUEST.
 */
static void cache_merge(rlm_cache_t *inst, REQUEST *request,
			rlm_cache_entry_t *c)
{
	VALUE_PAIR *vp;

	rad_assert(request != NULL);
	rad_assert(c != NULL);
	
	vp = pairfind(request->config_items, PW_CACHE_MERGE, 0, TAG_ANY);
	if (vp && (vp->vp_integer == 0)) {
		RDEBUG2("Told not to merge entry into request");
		return;
	}

	if (c->control) {
		RDEBUG2("Merging cached control list:");
		rdebug_pair_list(2, request, c->control);
		
		vp = paircopy(c->control);
		pairmove(&request->config_items, &vp);
		pairfree(&vp);
	}

	if (c->request && request->packet) {
		RDEBUG2("Merging cached request list:");
		rdebug_pair_list(2, request, c->request);
		
		vp = paircopy(c->request);
		pairmove(&request->packet->vps, &vp);
		pairfree(&vp);
	}

	if (c->reply && request->reply) {
		RDEBUG2("Merging cached reply list:");
		rdebug_pair_list(2, request, c->reply);
		
		vp = paircopy(c->reply);
		pairmove(&request->reply->vps, &vp);
		pairfree(&vp);
	}
	
	if (inst->stats) {
		vp = paircreate(PW_CACHE_ENTRY_HITS, 0, PW_TYPE_INTEGER);
		rad_assert(vp != NULL);
		
		vp->vp_integer = c->hits;

		pairadd(&request->packet->vps, vp);
	}
}

static int mschapv1_encode(VALUE_PAIR **request, const char *password)
{
	unsigned int i;
	VALUE_PAIR *challenge, *response;
	uint8_t nthash[16];

	challenge = paircreate(PW_MSCHAP_CHALLENGE, VENDORPEC_MICROSOFT, PW_TYPE_OCTETS);
	if (!challenge) {
		fprintf(stderr, "GOT IT %d!\n", __LINE__);
		return 0;
	}

	pairadd(request, challenge);
	challenge->length = 8;
	for (i = 0; i < challenge->length; i++) {
		challenge->vp_octets[i] = fr_rand();
	}

	response = paircreate(PW_MSCHAP_RESPONSE, VENDORPEC_MICROSOFT, PW_TYPE_OCTETS);
	if (!response) {
		fprintf(stderr, "GOT IT %d!\n", __LINE__);
		return 0;
	}

	pairadd(request, response);
	response->length = 50;
	memset(response->vp_octets, 0, response->length);

	response->vp_octets[1] = 0x01; /* NT hash */

	mschap_ntpwdhash(nthash, password);

	smbdes_mschap(nthash, challenge->vp_octets,
		      response->vp_octets + 26);
	return 1;
}

/** Create a pair and add it to a particular list of VPs
 *
 * Note that this function ALWAYS returns. If we're OOM, then it causes the
 * server to exit!
 */
VALUE_PAIR *radius_paircreate(UNUSED REQUEST *request, VALUE_PAIR **vps,
			      unsigned int attribute, unsigned int vendor, int type)
{
	VALUE_PAIR *vp;

	vp = paircreate(attribute, vendor, type);
	if (!vp) {
		radlog(L_ERR, "No memory!");
		rad_assert("No memory" == NULL);
		_exit(1);
	}

	if (vps) pairadd(vps, vp);

	return vp;
}

/** Create a VALUE_PAIR and add it to a list of VALUE_PAIR s
 *
 * @note This function ALWAYS returns. If we're OOM, then it causes the
 * @note server to exit, so you don't need to check the return value.
 *
 * @param[in] ctx Context to allocate VALUE_PAIRs in.
 * @param[out] vps List to add new VALUE_PAIR to, if NULL will just
 *	return VALUE_PAIR.
 * @param[in] attribute number.
 * @param[in] vendor number.
 * @return a new VLAUE_PAIR or causes server to exit on error.
 */
VALUE_PAIR *radius_paircreate(TALLOC_CTX *ctx, VALUE_PAIR **vps,
			      unsigned int attribute, unsigned int vendor)
{
	VALUE_PAIR *vp;

	vp = paircreate(ctx, attribute, vendor);
	if (!vp) {
		ERROR("No memory!");
		rad_assert("No memory" == NULL);
		fr_exit_now(1);
	}

	if (vps) pairadd(vps, vp);

	return vp;
}