/* 
	 * 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 "b_config.h"
	
	#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 <netdb.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(struct booth_config *conf)
	{
		const int added = 5;
		int had, want;
		void *p;
	
		assert(conf != NULL);
	
		had = conf->ticket_allocated;
		want = had + added;
	
		p = realloc(conf->ticket, sizeof(struct ticket_config) * want);
		if (!p) {
			log_error("can't alloc more tickets");
			return -ENOMEM;
		}
	
		conf->ticket = p;
		memset(conf->ticket + had, 0,
		       sizeof(struct ticket_config) * added);
		conf->ticket_allocated = want;
	
		return 0;
	}
	
	static void
	hostname_to_ip(char *hostname)
	{
		struct addrinfo hints;
		struct addrinfo *result, *rp;
		int res;
		int addr_found = 0;
		const char *ntop_res;
	
		memset(&hints, 0, sizeof(hints));
		hints.ai_family = AF_UNSPEC;
		hints.ai_socktype = SOCK_STREAM;
	
		res = getaddrinfo(hostname, NULL, &hints, &result);
	
		if (res != 0) {
			log_error("can't find IP for the host \"%s\"", hostname);
			return;
		}
	
		/* Return the first found AF_INET or AF_INET6 address */
		for (rp = result; rp && !addr_found; rp = rp->ai_next) {
			if (rp->ai_family != AF_INET && rp->ai_family != AF_INET6) {
				continue ;
			}
	
			switch (rp->ai_family) {
			case AF_INET:
				ntop_res = inet_ntop(rp->ai_family,
				    &((struct sockaddr_in *)(rp->ai_addr))->sin_addr,
				    hostname, BOOTH_NAME_LEN - 1);
				break;
			case AF_INET6:
				ntop_res = inet_ntop(rp->ai_family,
				    &((struct sockaddr_in6 *)(rp->ai_addr))->sin6_addr,
				    hostname, BOOTH_NAME_LEN - 1);
				break;
			}
	
			if (ntop_res) {
				/* buffer overflow will not happen (IPv6 notation < 63 chars),
				   but suppress the warnings */
				hostname[BOOTH_NAME_LEN - 1] = '\0';
				addr_found = 1;
			}
		}
	
		if (!addr_found) {
			log_error("no IP addresses found for the host \"%s\"", hostname);
		}
	
		freeaddrinfo(result);
	}
	
	static int
	add_site(struct booth_config *conf, char *addr_string, int type)
	{
		int rv;
		struct booth_site *site;
		uLong nid;
		uint32_t mask;
		int i;
	
		assert(conf != NULL);
	
		rv = 1;
		if (conf->site_count == MAX_NODES) {
			log_error("too many nodes");
			goto out;
		}
		if (strnlen(addr_string, sizeof(conf->site[0].addr_string))
				>= sizeof(conf->site[0].addr_string)) {
			log_error("site address \"%s\" too long", addr_string);
			goto out;
		}
	
		site = conf->site + conf->site_count;
	
		site->family = AF_INET;
		site->type = type;
	
		/* buffer overflow will not hapen (we've already checked that
		   addr_string will fit incl. terminating '\0' above), but
		   suppress the warnings with copying everything but the boundary
		   byte, which is valid as-is, since this last byte will be safely
		   pre-zeroed from the struct booth_config initialization */
		strncpy(site->addr_string, addr_string, sizeof(site->addr_string) - 1);
	
		if (!(inet_pton(AF_INET, site->addr_string, &site->sa4.sin_addr) > 0) &&
	        !(inet_pton(AF_INET6, site->addr_string, &site->sa6.sin6_addr) > 0)) {
	
			/* Not a valid address, so let us try to convert it into an IP address */
			hostname_to_ip(site->addr_string);
		}
	
		site->index = conf->site_count;
		site->bitmask = 1 << conf->site_count;
		/* Catch site overflow */
		assert(site->bitmask);
		conf->all_bits |= site->bitmask;
		if (type == SITE) {
			conf->sites_bits |= site->bitmask;
		}
	
		site->tcp_fd = -1;
	
		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.
		 * Note that POSIX mandates inet_pton to arange the address pointed
		 * to by "dst" in network byte order, assuring little/big-endianess
		 * mutual compatibility. */
		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(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(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 (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;
	}
	
	static inline 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;
	}
	
	static inline char *
	skip_while(char *cp, int (*fn)(int))
	{
		while (fn(*cp))
			cp++;
		return cp;
	}
	
	static inline 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(struct booth_config *conf, const char *name,
	           struct ticket_config **tkp, const struct ticket_config *def)
	{
		int rv;
		struct ticket_config *tk;
	

		assert(conf != NULL);
	

		if (conf->ticket_count == conf->ticket_allocated) {
			rv = ticket_realloc(conf);

			if (rv < 0) {
				return rv;

			}
		}
	
	
		tk = conf->ticket + conf->ticket_count;
		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(conf, 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));
		tk->mode = def->mode;
	
		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;
	}
	
	/* returns TICKET_MODE_AUTO if failed to parse the ticket mode. */
	static ticket_mode_e
	retrieve_ticket_mode(const char *input)
	{
		if (strcasecmp(input, "manual") == 0) {
			return TICKET_MODE_MANUAL;
		}
	
		return TICKET_MODE_AUTO;
	}
	
	/* 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 = t*1000L; /* 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(struct booth_config **conf, const char *path, int type)
	{
		char line[1024];
		char error_str_buf[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;
	
		assert(conf != NULL);
		free(*conf);
	
		fp = fopen(path, "r");
		if (!fp) {
			log_error("failed to open %s: %s", path, strerror(errno));
			*conf = NULL;
			return -1;
		}
	
		*conf = malloc(sizeof(struct booth_config)
				+ TICKET_ALLOC * sizeof(struct ticket_config));
		if (*conf == NULL) {
			fclose(fp);
			log_error("failed to alloc memory for booth config");
			return -ENOMEM;
		}
		memset(*conf, 0, sizeof(struct booth_config)
				+ TICKET_ALLOC * sizeof(struct ticket_config));
		ticket_size = TICKET_ALLOC;
	
	
		(*conf)->proto = UDP;
		(*conf)->port = BOOTH_DEFAULT_PORT;
		(*conf)->maxtimeskew = BOOTH_DEFAULT_MAX_TIME_SKEW;
		(*conf)->authkey[0] = '\0';
	
	
		/* Provide safe defaults. -1 is reserved, though. */
		(*conf)->uid = -2;
		(*conf)->gid = -2;
		strcpy((*conf)->site_user,  "hacluster");
		strcpy((*conf)->site_group, "haclient");
		strcpy((*conf)->arb_user,   "nobody");
		strcpy((*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;
		defaults.mode          = TICKET_MODE_AUTO;
	
		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) {
					(*conf)->proto = UDP;
				} else if (strcasecmp(val, "SCTP") == 0) {
					(*conf)->proto = SCTP;
				} else {
					(void)snprintf(error_str_buf, sizeof(error_str_buf),
					    "invalid transport protocol \"%s\"", val);
					error = error_str_buf;
					goto err;
				}
				got_transport = 1;
				continue;
			}
	
			if (strcmp(key, "port") == 0) {
				(*conf)->port = atoi(val);
				continue;
			}
	
			if (strcmp(key, "name") == 0) {
				safe_copy((*conf)->name,
						val, BOOTH_NAME_LEN,
						"name");
				continue;
			}
	
	#if HAVE_LIBGNUTLS || HAVE_LIBGCRYPT || HAVE_LIBMHASH
			if (strcmp(key, "authfile") == 0) {
				safe_copy((*conf)->authfile,
						val, BOOTH_PATH_LEN,
						"authfile");
				continue;
			}
	
			if (strcmp(key, "maxtimeskew") == 0) {
				(*conf)->maxtimeskew = atoi(val);
				continue;
			}
	#endif
	
			if (strcmp(key, "site") == 0) {
				if (add_site(*conf, val, SITE)) {
					goto err;
				}
				continue;
			}
	
			if (strcmp(key, "arbitrator") == 0) {
				if (add_site(*conf, val, ARBITRATOR)) {
					goto err;
				}
				continue;
			}
	
			if (strcmp(key, "site-user") == 0) {
				safe_copy((*conf)->site_user, optarg, BOOTH_NAME_LEN,
				          "site-user");
				continue;
			}
			if (strcmp(key, "site-group") == 0) {
				safe_copy((*conf)->site_group, optarg, BOOTH_NAME_LEN,
				          "site-group");
				continue;
			}
			if (strcmp(key, "arbitrator-user") == 0) {
				safe_copy((*conf)->arb_user, optarg, BOOTH_NAME_LEN,
				          "arbitrator-user");
				continue;
			}
			if (strcmp(key, "arbitrator-group") == 0) {
				safe_copy((*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(*conf, 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) {
				(void)snprintf(error_str_buf, sizeof(error_str_buf),
				    "Unexpected keyword \"%s\"", key);
				error = error_str_buf;
				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, "mode") == 0) {
				current_tk->mode = retrieve_ticket_mode(val);
				continue;
			}
	
			if (strcmp(key, "weights") == 0) {
				if (parse_weights(val, current_tk->weight) < 0)
					goto err;
				continue;
			}
	
			(void)snprintf(error_str_buf, sizeof(error_str_buf),
			    "Unknown keyword \"%s\"", key);
			error = error_str_buf;
			goto err;
		}
		fclose(fp);
	
		if (((*conf)->site_count % 2) == 0) {
			log_warn("Odd number of nodes is strongly recommended!");
		}
	
		/* Default: make config name match config filename. */
		if (!(*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((*conf)->name, cp, cp2-cp);
			*((*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(*conf);
		*conf = NULL;
		return -1;
	}
	
	int
	check_config(struct booth_config *conf, int type)
	{
		struct passwd *pw;
		struct group *gr;
		char *cp, *input;
	
		if (conf == NULL) {
			return -1;
		}
	
		input = (type == ARBITRATOR)
			? conf->arb_user
			: conf->site_user;
		if (!*input)
			goto u_inval;
		if (isdigit(input[0])) {
			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;
			conf->uid = pw->pw_uid;
		}
	
	
		input = (type == ARBITRATOR)
			? conf->arb_group
			: conf->site_group;
	
		if (!*input) {
			goto g_inval;
		}
	
		if (isdigit(input[0])) {
			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;
			}
			conf->gid = gr->gr_gid;
		}
	
		return 0;
	}
	
	
	static int
	get_other_site(struct booth_config *conf, struct booth_site **node)
	{
		struct booth_site *n;
		int i;
	
		*node = NULL;
		if (conf == NULL) {
			return 0;
		}
	
		FOREACH_NODE(conf, i, n) {
			if (n != local && n->type == SITE) {
				if (!*node) {
					*node = n;
				} else {
					return 0;
				}
			}
		}
	
		return !*node ? 0 : 1;
	}
	
	
	int
	find_site_by_name(struct booth_config *conf, const char *site,
	                  struct booth_site **node, int any_type)
	{
		struct booth_site *n;
		int i;
	
		if (conf == NULL) {
			return 0;
		}
	
		if (!strcmp(site, OTHER_SITE)) {
			return get_other_site(conf, node);
		}
	
		FOREACH_NODE(conf, i, n) {
			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(struct booth_config *conf, 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 (conf == NULL) {
			return 0;
		}
	
		FOREACH_NODE(conf, i, n) {
			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??";
	}