config.c
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config.c
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	/*
	* Copyright (C) 2011 Jiaju Zhang <jjzhang@suse.de>
	* Copyright (C) 2013-2014 Philipp Marek <philipp.marek@linbit.com>
	*
	* This program 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 2 of the License, or (at your option) any later version.
	*
	* This software 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 this program; if not, write to the Free Software Foundation, Inc.,
	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	*/

	#include <stdio.h>
	#include <ctype.h>
	#include <stdlib.h>
	#include <assert.h>
	#include <zlib.h>
	#include <sys/types.h>
	#include <pwd.h>
	#include <grp.h>
	#include <errno.h>
	#include <string.h>
	#include "b_config.h"
	#include "booth.h"
	#include "config.h"
	#include "raft.h"
	#include "ticket.h"
	#include "log.h"

	static int ticket_size = 0;

	static int ticket_realloc(void)
	{
	const int added = 5;
	int had, want;
	void *p;

	had = booth_conf->ticket_allocated;
	want = had + added;

	p = realloc(booth_conf->ticket,
	sizeof(struct ticket_config) * want);
	if (!p) {
	log_error("can't alloc more tickets");
	return -ENOMEM;
	}

	booth_conf->ticket = p;
	memset(booth_conf->ticket + had, 0,
	sizeof(struct ticket_config) * added);
	booth_conf->ticket_allocated = want;

	return 0;
	}


	static int add_site(char *addr_string, int type)
	{
	int rv;
	struct booth_site *site;
	uLong nid;
	uint32_t mask;
	int i;


	rv = 1;
	if (booth_conf->site_count == MAX_NODES) {
	log_error("too many nodes");
	goto out;
	}
	if (strnlen(addr_string, sizeof(booth_conf->site[0].addr_string))
	>= sizeof(booth_conf->site[0].addr_string)) {
	log_error("site address \"%s\" too long", addr_string);
	goto out;
	}

	site = booth_conf->site + booth_conf->site_count;

	site->family = AF_INET;
	site->type = type;
	strncpy(site->addr_string, addr_string, sizeof(site->addr_string));


	site->index = booth_conf->site_count;
	site->bitmask = 1 << booth_conf->site_count;
	/* Catch site overflow */
	assert(site->bitmask);
	booth_conf->all_bits \|= site->bitmask;
	if (type == SITE)
	booth_conf->sites_bits \|= site->bitmask;

	site->tcp_fd = -1;

	booth_conf->site_count++;

	rv = 0;
	memset(&site->sa6, 0, sizeof(site->sa6));

	nid = crc32(0L, NULL, 0);
	/* Using the ASCII representation in site->addr_string (both sizeof()
	* and strlen()) gives quite a lot of collisions; a brute-force run
	* from 0.0.0.0 to 24.0.0.0 gives ~4% collisions, and this tends to
	* increase even more.
	* Whether there'll be a collision in real-life, with 3 or 5 nodes, is
	* another question ... but for now get the ID from the binary
	* representation - that had no collisions up to 32.0.0.0. */
	if (inet_pton(AF_INET,
	site->addr_string,
	&site->sa4.sin_addr) > 0) {

	site->family = AF_INET;
	site->sa4.sin_family = site->family;
	site->sa4.sin_port = htons(booth_conf->port);
	site->saddrlen = sizeof(site->sa4);
	site->addrlen = sizeof(site->sa4.sin_addr);
	site->site_id = crc32(nid, (void*)&site->sa4.sin_addr, site->addrlen);

	} else if (inet_pton(AF_INET6,
	site->addr_string,
	&site->sa6.sin6_addr) > 0) {

	site->family = AF_INET6;
	site->sa6.sin6_family = site->family;
	site->sa6.sin6_flowinfo = 0;
	site->sa6.sin6_port = htons(booth_conf->port);
	site->saddrlen = sizeof(site->sa6);
	site->addrlen = sizeof(site->sa6.sin6_addr);
	site->site_id = crc32(nid, (void*)&site->sa6.sin6_addr, site->addrlen);

	} else {
	log_error("Address string \"%s\" is bad", site->addr_string);
	rv = EINVAL;
	}

	/* Make sure we will never collide with NO_ONE,
	* or be negative (to get "get_local_id() < 0" working). */
	mask = 1 << (sizeof(site->site_id)*8 -1);
	assert(NO_ONE & mask);
	site->site_id &= ~mask;


	/* Test for collisions with other sites */
	for(i=0; i<site->index; i++)
	if (booth_conf->site[i].site_id == site->site_id) {
	log_error("Got a site-ID collision. Please file a bug on https://github.com/ClusterLabs/booth/issues/new, attaching the configuration file.");
	exit(1);
	}

	out:
	return rv;
	}


	inline static char skip_while_in(const char cp, int (fn)(int), const char allowed)
	{
	/* strchr() returns a pointer to the terminator if cp == 0. /
	while (*cp &&
	(fn(*cp) \|\|
	strchr(allowed, *cp)))
	cp++;
	/* discard "const" qualifier */
	return (char*)cp;
	}


	inline static char skip_while(char cp, int (*fn)(int))
	{
	while (fn(*cp))
	cp++;
	return cp;
	}

	inline static char skip_until(char cp, char expected)
	{
	while (cp && cp != expected)
	cp++;
	return cp;
	}


	static inline int is_end_of_line(char *cp)
	{
	char c = *cp;
	return c == '\n' \|\| c == 0 \|\| c == '#';
	}


	static int add_ticket(const char name, struct ticket_config *tkp,
	const struct ticket_config *def)
	{
	int rv;
	struct ticket_config *tk;


	if (booth_conf->ticket_count == booth_conf->ticket_allocated) {
	rv = ticket_realloc();
	if (rv < 0)
	return rv;
	}


	tk = booth_conf->ticket + booth_conf->ticket_count;
	booth_conf->ticket_count++;

	if (!check_max_len_valid(name, sizeof(tk->name))) {
	log_error("ticket name \"%s\" too long.", name);
	return -EINVAL;
	}

	if (find_ticket_by_name(name, NULL)) {
	log_error("ticket name \"%s\" used again.", name);
	return -EINVAL;
	}

	if (* skip_while_in(name, isalnum, "-/")) {
	log_error("ticket name \"%s\" invalid; only alphanumeric names.", name);
	return -EINVAL;
	}

	strcpy(tk->name, name);
	tk->timeout = def->timeout;
	tk->term_duration = def->term_duration;
	tk->retries = def->retries;
	memcpy(tk->weight, def->weight, sizeof(tk->weight));

	if (tkp)
	*tkp = tk;
	return 0;
	}

	static int postproc_ticket(struct ticket_config *tk)
	{
	if (!tk)
	return 1;

	if (!tk->renewal_freq) {
	tk->renewal_freq = tk->term_duration/2;
	}

	if (tk->timeout*(tk->retries+1) >= tk->renewal_freq) {
	log_error("%s: total amount of time to "
	"retry sending packets cannot exceed "
	"renewal frequency "
	"(%d*(%d+1) >= %d)",
	tk->name, tk->timeout, tk->retries, tk->renewal_freq);
	return 0;
	}
	return 1;
	}

	/* returns number of weights, or -1 on bad input. */
	static int parse_weights(const char *input, int weights[MAX_NODES])
	{
	int i, v;
	char *cp;

	for(i=0; i<MAX_NODES; i++) {
	/* End of input? */
	if (*input == 0)
	break;

	v = strtol(input, &cp, 0);
	if (input == cp) {
	log_error("No integer weight value at \"%s\"", input);
	return -1;
	}

	weights[i] = v;

	while (*cp) {
	/* Separator characters */
	if (isspace(*cp) \|\|
	strchr(",;:-+", *cp))
	cp++;
	/* Next weight */
	else if (isdigit(*cp))
	break;
	/* Rest */
	else {
	log_error("Invalid character at \"%s\"", cp);
	return -1;
	}
	}

	input = cp;
	}


	/* Fill rest of vector. */
	for(v=i; v<MAX_NODES; v++) {
	weights[v] = 0;
	}

	return i;
	}


	/* scan val for time; time is [0-9]+(ms)?, i.e. either in seconds
	* or milliseconds
	* returns -1 on failure, otherwise time in ms
	*/
	static long read_time(char *val)
	{
	long t;
	char *ep;

	t = strtol(val, &ep, 10);
	if (ep == val) { /* matched none */
	t = -1L;
	} else if (ep == '\0') { / matched all */
	t = t1000L; / in seconds, convert to ms */
	} else if (strcmp(ep, "ms")) { /* ms not exactly matched */
	t = -1L;
	} /* otherwise, time in ms */
	/* if second fractions configured, send finer resolution
	* times (i.e. term_valid_for) */
	if (t % 1000L) {
	TIME_MULT = 1000;
	}
	return t;
	}

	/* make arguments for execv(2)
	* tk_test.path points to the path
	* tk_test.argv is argument vector (starts with the prog)
	* (strtok pokes holes in the configuration parameter value, i.e.
	* we don't need to allocate memory for arguments)
	*/
	static int parse_extprog(char val, struct ticket_config tk)
	{
	char *p;
	int i = 0;

	if (tk_test.path) {
	free(tk_test.path);
	}
	if (!(tk_test.path = strdup(val))) {
	log_error("out of memory");
	return -1;
	}

	p = strtok(tk_test.path, " \t");
	tk_test.argv[i++] = p;
	do {
	p = strtok(NULL, " \t");
	if (i >= MAX_ARGS) {
	log_error("too many arguments for the acquire-handler");
	free(tk_test.path);
	return -1;
	}
	tk_test.argv[i++] = p;
	} while (p);

	return 0;
	}

	struct toktab grant_type[] = {
	{ "auto", GRANT_AUTO},
	{ "manual", GRANT_MANUAL},
	{ NULL, 0},
	};

	struct toktab attr_op[] = {
	{"eq", ATTR_OP_EQ},
	{"ne", ATTR_OP_NE},
	{NULL, 0},
	};

	static int lookup_tokval(char key, struct toktab tab)
	{
	struct toktab *tp;

	for (tp = tab; tp->str; tp++) {
	if (!strcmp(tp->str, key))
	return tp->val;
	}
	return 0;
	}

	/* attribute prerequisite
	*/
	static int parse_attr_prereq(char val, struct ticket_config tk)
	{
	struct attr_prereq *ap = NULL;
	char *p;

	ap = (struct attr_prereq *)calloc(1, sizeof(struct attr_prereq));
	if (!ap) {
	log_error("out of memory");
	return -1;
	}

	p = strtok(val, " \t");
	if (!p) {
	log_error("not enough arguments to attr-prereq");
	goto err_out;
	}
	ap->grant_type = lookup_tokval(p, grant_type);
	if (!ap->grant_type) {
	log_error("%s is not a grant type", p);
	goto err_out;
	}

	p = strtok(NULL, " \t");
	if (!p) {
	log_error("not enough arguments to attr-prereq");
	goto err_out;
	}
	if (!(ap->attr_name = strdup(p))) {
	log_error("out of memory");
	goto err_out;
	}

	p = strtok(NULL, " \t");
	if (!p) {
	log_error("not enough arguments to attr-prereq");
	goto err_out;
	}
	ap->op = lookup_tokval(p, attr_op);
	if (!ap->op) {
	log_error("%s is not an attribute operation", p);
	goto err_out;
	}

	p = strtok(NULL, " \t");
	if (!p) {
	log_error("not enough arguments to attr-prereq");
	goto err_out;
	}
	if (!(ap->attr_val = strdup(p))) {
	log_error("out of memory");
	goto err_out;
	}

	tk->attr_prereqs = g_list_append(tk->attr_prereqs, ap);
	if (!tk->attr_prereqs) {
	log_error("out of memory");
	goto err_out;
	}

	return 0;

	err_out:
	if (ap) {
	if (ap->attr_val)
	free(ap->attr_val);
	if (ap->attr_name)
	free(ap->attr_name);
	free(ap);
	}
	return -1;
	}

	extern int poll_timeout;

	int read_config(const char *path, int type)
	{
	char line[1024];
	FILE *fp;
	char s, key, val, end_of_key;
	const char *error;
	char cp, cp2;
	int i;
	int lineno = 0;
	int got_transport = 0;
	int min_timeout = 0;
	struct ticket_config defaults = { { 0 } };
	struct ticket_config *current_tk = NULL;


	fp = fopen(path, "r");
	if (!fp) {
	log_error("failed to open %s: %s", path, strerror(errno));
	return -1;
	}

	booth_conf = malloc(sizeof(struct booth_config)
	+ TICKET_ALLOC * sizeof(struct ticket_config));
	if (!booth_conf) {
	fclose(fp);
	log_error("failed to alloc memory for booth config");
	return -ENOMEM;
	}
	memset(booth_conf, 0, sizeof(struct booth_config)
	+ TICKET_ALLOC * sizeof(struct ticket_config));
	ticket_size = TICKET_ALLOC;


	booth_conf->proto = UDP;
	booth_conf->port = BOOTH_DEFAULT_PORT;
	booth_conf->maxtimeskew = BOOTH_DEFAULT_MAX_TIME_SKEW;
	booth_conf->authkey[0] = '\0';


	/* Provide safe defaults. -1 is reserved, though. */
	booth_conf->uid = -2;
	booth_conf->gid = -2;
	strcpy(booth_conf->site_user, "hacluster");
	strcpy(booth_conf->site_group, "haclient");
	strcpy(booth_conf->arb_user, "nobody");
	strcpy(booth_conf->arb_group, "nobody");

	parse_weights("", defaults.weight);
	defaults.clu_test.path = NULL;
	defaults.clu_test.pid = 0;
	defaults.clu_test.status = 0;
	defaults.clu_test.progstate = EXTPROG_IDLE;
	defaults.term_duration = DEFAULT_TICKET_EXPIRY;
	defaults.timeout = DEFAULT_TICKET_TIMEOUT;
	defaults.retries = DEFAULT_RETRIES;
	defaults.acquire_after = 0;

	error = "";

	log_debug("reading config file %s", path);
	while (fgets(line, sizeof(line), fp)) {
	lineno++;

	s = skip_while(line, isspace);
	if (is_end_of_line(s) \|\| *s == '#')
	continue;
	key = s;


	/* Key */
	end_of_key = skip_while_in(key, isalnum, "-_");
	if (end_of_key == key) {
	error = "No key";
	goto err;
	}

	if (!*end_of_key)
	goto exp_equal;


	/* whitespace, and something else but nothing more? */
	s = skip_while(end_of_key, isspace);


	if (*s != '=') {
	exp_equal:
	error = "Expected '=' after key";
	goto err;
	}
	s++;

	/* It's my buffer, and I terminate if I want to. */
	/* But not earlier than that, because we had to check for = */
	*end_of_key = 0;


	/* Value tokenizing */
	s = skip_while(s, isspace);
	switch (*s) {
	case '"':
	case '\'':
	val = s+1;
	s = skip_until(val, *s);
	/* Terminate value */
	if (!*s) {
	error = "Unterminated quoted string";
	goto err;
	}

	/* Remove and skip quote */
	*s = 0;
	s++;
	if ((s = skip_while(s, isspace)) && s != '#') {
	error = "Surplus data after value";
	goto err;
	}

	*s = 0;

	break;

	case 0:
	no_value:
	error = "No value";
	goto err;
	break;

	default:
	val = s;
	/* Rest of line. */
	i = strlen(s);
	/* i > 0 because of "case 0" above. */
	while (i > 0 && isspace(s[i-1]))
	i--;
	s += i;
	*s = 0;
	}

	if (val == s)
	goto no_value;


	if (strlen(key) > BOOTH_NAME_LEN
	\|\| strlen(val) > BOOTH_NAME_LEN) {
	error = "key/value too long";
	goto err;
	}

	if (strcmp(key, "transport") == 0) {
	if (got_transport) {
	error = "config file has multiple transport lines";
	goto err;
	}

	if (strcasecmp(val, "UDP") == 0)
	booth_conf->proto = UDP;
	else if (strcasecmp(val, "SCTP") == 0)
	booth_conf->proto = SCTP;
	else {
	error = "invalid transport protocol";
	goto err;
	}
	got_transport = 1;
	continue;
	}

	if (strcmp(key, "port") == 0) {
	booth_conf->port = atoi(val);
	continue;
	}

	if (strcmp(key, "name") == 0) {
	safe_copy(booth_conf->name,
	val, BOOTH_NAME_LEN,
	"name");
	continue;
	}

	#if HAVE_LIBGCRYPT \|\| HAVE_LIBMHASH
	if (strcmp(key, "authfile") == 0) {
	safe_copy(booth_conf->authfile,
	val, BOOTH_PATH_LEN,
	"authfile");
	continue;
	}

	if (strcmp(key, "maxtimeskew") == 0) {
	booth_conf->maxtimeskew = atoi(val);
	continue;
	}
	#endif

	if (strcmp(key, "site") == 0) {
	if (add_site(val, SITE))
	goto err;
	continue;
	}

	if (strcmp(key, "arbitrator") == 0) {
	if (add_site(val, ARBITRATOR))
	goto err;
	continue;
	}

	if (strcmp(key, "site-user") == 0) {
	safe_copy(booth_conf->site_user, optarg, BOOTH_NAME_LEN,
	"site-user");
	continue;
	}
	if (strcmp(key, "site-group") == 0) {
	safe_copy(booth_conf->site_group, optarg, BOOTH_NAME_LEN,
	"site-group");
	continue;
	}
	if (strcmp(key, "arbitrator-user") == 0) {
	safe_copy(booth_conf->arb_user, optarg, BOOTH_NAME_LEN,
	"arbitrator-user");
	continue;
	}
	if (strcmp(key, "arbitrator-group") == 0) {
	safe_copy(booth_conf->arb_group, optarg, BOOTH_NAME_LEN,
	"arbitrator-group");
	continue;
	}

	if (strcmp(key, "debug") == 0) {
	if (type != CLIENT && type != GEOSTORE)
	debug_level = max(debug_level, atoi(val));
	continue;
	}

	if (strcmp(key, "ticket") == 0) {
	if (current_tk && strcmp(current_tk->name, "__defaults__")) {
	if (!postproc_ticket(current_tk)) {
	goto err;
	}
	}
	if (!strcmp(val, "__defaults__")) {
	current_tk = &defaults;
	} else if (add_ticket(val, &current_tk, &defaults)) {
	goto err;
	}
	continue;
	}

	/* current_tk must be allocated at this point, otherwise
	* we don't know to which ticket the key refers
	*/
	if (!current_tk) {
	error = "Unexpected keyword";
	goto err;
	}

	if (strcmp(key, "expire") == 0) {
	current_tk->term_duration = read_time(val);
	if (current_tk->term_duration <= 0) {
	error = "Expected time >0 for expire";
	goto err;
	}
	continue;
	}

	if (strcmp(key, "timeout") == 0) {
	current_tk->timeout = read_time(val);
	if (current_tk->timeout <= 0) {
	error = "Expected time >0 for timeout";
	goto err;
	}
	if (!min_timeout) {
	min_timeout = current_tk->timeout;
	} else {
	min_timeout = min(min_timeout, current_tk->timeout);
	}
	continue;
	}

	if (strcmp(key, "retries") == 0) {
	current_tk->retries = strtol(val, &s, 0);
	if (*s \|\| s == val \|\|
	current_tk->retries<3 \|\| current_tk->retries > 100) {
	error = "Expected plain integer value in the range [3, 100] for retries";
	goto err;
	}
	continue;
	}

	if (strcmp(key, "renewal-freq") == 0) {
	current_tk->renewal_freq = read_time(val);
	if (current_tk->renewal_freq <= 0) {
	error = "Expected time >0 for renewal-freq";
	goto err;
	}
	continue;
	}

	if (strcmp(key, "acquire-after") == 0) {
	current_tk->acquire_after = read_time(val);
	if (current_tk->acquire_after < 0) {
	error = "Expected time >=0 for acquire-after";
	goto err;
	}
	continue;
	}

	if (strcmp(key, "before-acquire-handler") == 0) {
	if (parse_extprog(val, current_tk)) {
	goto err;
	}
	continue;
	}

	if (strcmp(key, "attr-prereq") == 0) {
	if (parse_attr_prereq(val, current_tk)) {
	goto err;
	}
	continue;
	}

	if (strcmp(key, "weights") == 0) {
	if (parse_weights(val, current_tk->weight) < 0)
	goto err;
	continue;
	}

	error = "Unknown keyword";
	goto err;
	}
	fclose(fp);

	if ((booth_conf->site_count % 2) == 0) {
	log_warn("Odd number of nodes is strongly recommended!");
	}

	/* Default: make config name match config filename. */
	if (!booth_conf->name[0]) {
	cp = strrchr(path, '/');
	cp = cp ? cp+1 : (char *)path;
	cp2 = strrchr(cp, '.');
	if (!cp2)
	cp2 = cp + strlen(cp);
	if (cp2-cp >= BOOTH_NAME_LEN) {
	log_error("booth config file name too long");
	goto out;
	}
	strncpy(booth_conf->name, cp, cp2-cp);
	*(booth_conf->name+(cp2-cp)) = '\0';
	}

	if (!postproc_ticket(current_tk)) {
	goto out;
	}

	poll_timeout = min(POLL_TIMEOUT, min_timeout/10);
	if (!poll_timeout)
	poll_timeout = POLL_TIMEOUT;

	return 0;


	err:
	fclose(fp);
	out:
	log_error("%s in config file line %d",
	error, lineno);

	free(booth_conf);
	booth_conf = NULL;
	return -1;
	}


	int check_config(int type)
	{
	struct passwd *pw;
	struct group *gr;
	char cp, input;

	if (!booth_conf)
	return -1;


	input = (type == ARBITRATOR)
	? booth_conf->arb_user
	: booth_conf->site_user;
	if (!*input)
	goto u_inval;
	if (isdigit(input[0])) {
	booth_conf->uid = strtol(input, &cp, 0);
	if (*cp != 0) {
	u_inval:
	log_error("User \"%s\" cannot be resolved into a UID.", input);
	return ENOENT;
	}
	}
	else {
	pw = getpwnam(input);
	if (!pw)
	goto u_inval;
	booth_conf->uid = pw->pw_uid;
	}


	input = (type == ARBITRATOR)
	? booth_conf->arb_group
	: booth_conf->site_group;
	if (!*input)
	goto g_inval;
	if (isdigit(input[0])) {
	booth_conf->gid = strtol(input, &cp, 0);
	if (*cp != 0) {
	g_inval:
	log_error("Group \"%s\" cannot be resolved into a UID.", input);
	return ENOENT;
	}
	}
	else {
	gr = getgrnam(input);
	if (!gr)
	goto g_inval;
	booth_conf->gid = gr->gr_gid;
	}

	return 0;
	}


	static int get_other_site(struct booth_site **node)
	{
	struct booth_site *n;
	int i;

	*node = NULL;
	if (!booth_conf)
	return 0;

	for (i = 0; i < booth_conf->site_count; i++) {
	n = booth_conf->site + i;
	if (n != local && n->type == SITE) {
	if (!*node) {
	*node = n;
	} else {
	return 0;
	}
	}
	}

	return !*node ? 0 : 1;
	}


	int find_site_by_name(char site, struct booth_site *node, int any_type)
	{
	struct booth_site *n;
	int i;

	if (!booth_conf)
	return 0;

	if (!strcmp(site, OTHER_SITE))
	return get_other_site(node);

	for (i = 0; i < booth_conf->site_count; i++) {
	n = booth_conf->site + i;
	if ((n->type == SITE \|\| any_type) &&
	strncmp(n->addr_string, site, sizeof(n->addr_string)) == 0) {
	*node = n;
	return 1;
	}
	}

	return 0;
	}

	int find_site_by_id(uint32_t site_id, struct booth_site **node)
	{
	struct booth_site *n;
	int i;

	if (site_id == NO_ONE) {
	*node = no_leader;
	return 1;
	}

	if (!booth_conf)
	return 0;

	for (i = 0; i < booth_conf->site_count; i++) {
	n = booth_conf->site + i;
	if (n->site_id == site_id) {
	*node = n;
	return 1;
	}
	}

	return 0;
	}


	const char *type_to_string(int type)
	{
	switch (type)
	{
	case ARBITRATOR: return "arbitrator";
	case SITE: return "site";
	case CLIENT: return "client";
	case GEOSTORE: return "attr";
	}
	return "??invalid-type??";
	}

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