networking/udhcp/files.c

/* vi: set sw=4 ts=4: */
/*
 * files.c -- DHCP server file manipulation *
 * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
 */

#include <netinet/ether.h>

#include "common.h"
#include "dhcpd.h"
#include "options.h"


/* on these functions, make sure your datatype matches */
static int read_ip(const char *line, void *arg)
{
	len_and_sockaddr *lsa;

	lsa = host_and_af2sockaddr(line, 0, AF_INET);
	if (!lsa)
		return 0;
	*(uint32_t*)arg = lsa->u.sin.sin_addr.s_addr;
	free(lsa);
	return 1;
}

static int read_mac(const char *line, void *arg)
{
	struct ether_addr *temp_ether_addr;

	temp_ether_addr = ether_aton_r(line, (struct ether_addr *)arg);
	if (temp_ether_addr == NULL)
		return 0;
	return 1;
}


static int read_str(const char *line, void *arg)
{
	char **dest = arg;

	free(*dest);
	*dest = xstrdup(line);
	return 1;
}


static int read_u32(const char *line, void *arg)
{
	*(uint32_t*)arg = bb_strtou32(line, NULL, 10);
	return errno == 0;
}


static int read_yn(const char *line, void *arg)
{
	char *dest = arg;

	if (!strcasecmp("yes", line)) {
		*dest = 1;
		return 1;
	}
	if (!strcasecmp("no", line)) {
		*dest = 0;
		return 1;
	}
	return 0;
}


/* find option 'code' in opt_list */
struct option_set* FAST_FUNC find_option(struct option_set *opt_list, uint8_t code)
{
	while (opt_list && opt_list->data[OPT_CODE] < code)
		opt_list = opt_list->next;

	if (opt_list && opt_list->data[OPT_CODE] == code)
		return opt_list;
	return NULL;
}


/* add an option to the opt_list */
static void attach_option(struct option_set **opt_list,
		const struct dhcp_option *option, char *buffer, int length)
{
	struct option_set *existing, *new, **curr;

	existing = find_option(*opt_list, option->code);
	if (!existing) {
		DEBUG("Attaching option %02x to list", option->code);

#if ENABLE_FEATURE_UDHCP_RFC3397
		if ((option->flags & TYPE_MASK) == OPTION_STR1035)
			/* reuse buffer and length for RFC1035-formatted string */
			buffer = (char *)dname_enc(NULL, 0, buffer, &length);
#endif

		/* make a new option */
		new = xmalloc(sizeof(*new));
		new->data = xmalloc(length + 2);
		new->data[OPT_CODE] = option->code;
		new->data[OPT_LEN] = length;
		memcpy(new->data + 2, buffer, length);

		curr = opt_list;
		while (*curr && (*curr)->data[OPT_CODE] < option->code)
			curr = &(*curr)->next;

		new->next = *curr;
		*curr = new;
#if ENABLE_FEATURE_UDHCP_RFC3397
		if ((option->flags & TYPE_MASK) == OPTION_STR1035 && buffer != NULL)
			free(buffer);
#endif
		return;
	}

	/* add it to an existing option */
	DEBUG("Attaching option %02x to existing member of list", option->code);
	if (option->flags & OPTION_LIST) {
#if ENABLE_FEATURE_UDHCP_RFC3397
		if ((option->flags & TYPE_MASK) == OPTION_STR1035)
			/* reuse buffer and length for RFC1035-formatted string */
			buffer = (char *)dname_enc(existing->data + 2,
					existing->data[OPT_LEN], buffer, &length);
#endif
		if (existing->data[OPT_LEN] + length <= 255) {
			existing->data = xrealloc(existing->data,
					existing->data[OPT_LEN] + length + 3);
			if ((option->flags & TYPE_MASK) == OPTION_STRING) {
				/* ' ' can bring us to 256 - bad */
				if (existing->data[OPT_LEN] + length >= 255)
					return;
				/* add space separator between STRING options in a list */
				existing->data[existing->data[OPT_LEN] + 2] = ' ';
				existing->data[OPT_LEN]++;
			}
			memcpy(existing->data + existing->data[OPT_LEN] + 2, buffer, length);
			existing->data[OPT_LEN] += length;
		} /* else, ignore the data, we could put this in a second option in the future */
#if ENABLE_FEATURE_UDHCP_RFC3397
		if ((option->flags & TYPE_MASK) == OPTION_STR1035 && buffer != NULL)
			free(buffer);
#endif
	} /* else, ignore the new data */
}


/* read a dhcp option and add it to opt_list */
static int read_opt(const char *const_line, void *arg)
{
	struct option_set **opt_list = arg;
	char *opt, *val, *endptr;
	char *line;
	const struct dhcp_option *option;
	int retval, length, idx;
	char buffer[8] ALIGNED(4);
	uint16_t *result_u16 = (uint16_t *) buffer;
	uint32_t *result_u32 = (uint32_t *) buffer;

	/* Cheat, the only const line we'll actually get is "" */
	line = (char *) const_line;
	opt = strtok(line, " \t=");
	if (!opt)
		return 0;

	idx = index_in_strings(dhcp_option_strings, opt); /* NB: was strcasecmp! */
	if (idx < 0)
		return 0;
	option = &dhcp_options[idx];

	retval = 0;
	do {
		val = strtok(NULL, ", \t");
		if (!val) break;
		length = dhcp_option_lengths[option->flags & TYPE_MASK];
		retval = 0;
		opt = buffer; /* new meaning for variable opt */
		switch (option->flags & TYPE_MASK) {
		case OPTION_IP:
			retval = read_ip(val, buffer);
			break;
		case OPTION_IP_PAIR:
			retval = read_ip(val, buffer);
			val = strtok(NULL, ", \t/-");
			if (!val)
				retval = 0;
			if (retval)
				retval = read_ip(val, buffer + 4);
			break;
		case OPTION_STRING:
#if ENABLE_FEATURE_UDHCP_RFC3397
		case OPTION_STR1035:
#endif
			length = strlen(val);
			if (length > 0) {
				if (length > 254) length = 254;
				opt = val;
				retval = 1;
			}
			break;
		case OPTION_BOOLEAN:
			retval = read_yn(val, buffer);
			break;
		case OPTION_U8:
			buffer[0] = strtoul(val, &endptr, 0);
			retval = (endptr[0] == '\0');
			break;
		/* htonX are macros in older libc's, using temp var
		 * in code below for safety */
		/* TODO: use bb_strtoX? */
		case OPTION_U16: {
			unsigned long tmp = strtoul(val, &endptr, 0);
			*result_u16 = htons(tmp);
			retval = (endptr[0] == '\0' /*&& tmp < 0x10000*/);
			break;
		}
		case OPTION_S16: {
			long tmp = strtol(val, &endptr, 0);
			*result_u16 = htons(tmp);
			retval = (endptr[0] == '\0');
			break;
		}
		case OPTION_U32: {
			unsigned long tmp = strtoul(val, &endptr, 0);
			*result_u32 = htonl(tmp);
			retval = (endptr[0] == '\0');
			break;
		}
		case OPTION_S32: {
			long tmp = strtol(val, &endptr, 0);
			*result_u32 = htonl(tmp);
			retval = (endptr[0] == '\0');
			break;
		}
		default:
			break;
		}
		if (retval)
			attach_option(opt_list, option, opt, length);
	} while (retval && option->flags & OPTION_LIST);
	return retval;
}

static int read_staticlease(const char *const_line, void *arg)
{
	char *line;
	char *mac_string;
	char *ip_string;
	uint8_t *mac_bytes;
	uint32_t *ip;

	/* Allocate memory for addresses */
	mac_bytes = xmalloc(sizeof(unsigned char) * 8);
	ip = xmalloc(sizeof(uint32_t));

	/* Read mac */
	line = (char *) const_line;
	mac_string = strtok(line, " \t");
	read_mac(mac_string, mac_bytes);

	/* Read ip */
	ip_string = strtok(NULL, " \t");
	read_ip(ip_string, ip);

	addStaticLease(arg, mac_bytes, ip);

	if (ENABLE_UDHCP_DEBUG) printStaticLeases(arg);

	return 1;
}


struct config_keyword {
	const char *keyword;
	int (*handler)(const char *line, void *var);
	void *var;
	const char *def;
};

static const struct config_keyword keywords[] = {
	/* keyword       handler   variable address               default */
	{"start",        read_ip,  &(server_config.start_ip),     "192.168.0.20"},
	{"end",          read_ip,  &(server_config.end_ip),       "192.168.0.254"},
	{"interface",    read_str, &(server_config.interface),    "eth0"},
	/* Avoid "max_leases value not sane" warning by setting default
	 * to default_end_ip - default_start_ip + 1: */
	{"max_leases",   read_u32, &(server_config.max_leases),   "235"},
	{"remaining",    read_yn,  &(server_config.remaining),    "yes"},
	{"auto_time",    read_u32, &(server_config.auto_time),    "7200"},
	{"decline_time", read_u32, &(server_config.decline_time), "3600"},
	{"conflict_time",read_u32, &(server_config.conflict_time),"3600"},
	{"offer_time",   read_u32, &(server_config.offer_time),   "60"},
	{"min_lease",    read_u32, &(server_config.min_lease),    "60"},
	{"lease_file",   read_str, &(server_config.lease_file),   LEASES_FILE},
	{"pidfile",      read_str, &(server_config.pidfile),      "/var/run/udhcpd.pid"},
	{"siaddr",       read_ip,  &(server_config.siaddr),       "0.0.0.0"},
	/* keywords with no defaults must be last! */
	{"option",       read_opt, &(server_config.options),      ""},
	{"opt",          read_opt, &(server_config.options),      ""},
	{"notify_file",  read_str, &(server_config.notify_file),  ""},
	{"sname",        read_str, &(server_config.sname),        ""},
	{"boot_file",    read_str, &(server_config.boot_file),    ""},
	{"static_lease", read_staticlease, &(server_config.static_leases), ""},
	/* ADDME: static lease */
};
enum { KWS_WITH_DEFAULTS = ARRAY_SIZE(keywords) - 6 };

void FAST_FUNC read_config(const char *file)
{
	parser_t *parser;
	const struct config_keyword *k;
	unsigned i;
	char *token[2];

	for (i = 0; i < KWS_WITH_DEFAULTS; i++)
		keywords[i].handler(keywords[i].def, keywords[i].var);

	parser = config_open(file);
	while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL)) {
		for (k = keywords, i = 0; i < ARRAY_SIZE(keywords); k++, i++) {
			if (!strcasecmp(token[0], k->keyword)) {
				if (!k->handler(token[1], k->var)) {
					bb_error_msg("can't parse line %u in %s",
							parser->lineno, file);
					/* reset back to the default value */
					k->handler(k->def, k->var);
				}
				break;
			}
		}
	}
	config_close(parser);

	server_config.start_ip = ntohl(server_config.start_ip);
	server_config.end_ip = ntohl(server_config.end_ip);
}


void FAST_FUNC write_leases(void)
{
	int fp;
	unsigned i;
	time_t curr = time(0);
	unsigned long tmp_time;

	fp = open_or_warn(server_config.lease_file, O_WRONLY|O_CREAT|O_TRUNC);
	if (fp < 0) {
		return;
	}

	for (i = 0; i < server_config.max_leases; i++) {
		if (leases[i].yiaddr != 0) {

			/* screw with the time in the struct, for easier writing */
			tmp_time = leases[i].expires;

			if (server_config.remaining) {
				if (lease_expired(&(leases[i])))
					leases[i].expires = 0;
				else leases[i].expires -= curr;
			} /* else stick with the time we got */
			leases[i].expires = htonl(leases[i].expires);
			// FIXME: error check??
			full_write(fp, &leases[i], sizeof(leases[i]));

			/* then restore it when done */
			leases[i].expires = tmp_time;
		}
	}
	close(fp);

	if (server_config.notify_file) {
// TODO: vfork-based child creation
		char *cmd = xasprintf("%s %s", server_config.notify_file, server_config.lease_file);
		system(cmd);
		free(cmd);
	}
}


void FAST_FUNC read_leases(const char *file)
{
	int fp;
	unsigned i;
	struct dhcpOfferedAddr lease;

	fp = open_or_warn(file, O_RDONLY);
	if (fp < 0) {
		return;
	}

	i = 0;
	while (i < server_config.max_leases
	 && full_read(fp, &lease, sizeof(lease)) == sizeof(lease)
	) {
		/* ADDME: is it a static lease */
		uint32_t y = ntohl(lease.yiaddr);
		if (y >= server_config.start_ip && y <= server_config.end_ip) {
			lease.expires = ntohl(lease.expires);
			if (!server_config.remaining)
				lease.expires -= time(NULL);
			if (!(add_lease(lease.chaddr, lease.yiaddr, lease.expires))) {
				bb_error_msg("too many leases while loading %s", file);
				break;
			}
			i++;
		}
	}
	DEBUG("Read %d leases", i);
	close(fp);
}
1	niro	532	/* vi: set sw=4 ts=4: */
2			/*
3			* files.c -- DHCP server file manipulation *
4			* Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
5			*/
6
7			#include <netinet/ether.h>
8
9			#include "common.h"
10			#include "dhcpd.h"
11			#include "options.h"
12
13
14	niro	816	/* on these functions, make sure your datatype matches */
15	niro	532	static int read_ip(const char line, void arg)
16			{
17	niro	816	len_and_sockaddr *lsa;
18	niro	532
19	niro	816	lsa = host_and_af2sockaddr(line, 0, AF_INET);
20			if (!lsa)
21			return 0;
22			(uint32_t)arg = lsa->u.sin.sin_addr.s_addr;
23			free(lsa);
24			return 1;
25	niro	532	}
26
27			static int read_mac(const char line, void arg)
28			{
29			struct ether_addr *temp_ether_addr;
30
31	niro	816	temp_ether_addr = ether_aton_r(line, (struct ether_addr *)arg);
32	niro	532	if (temp_ether_addr == NULL)
33	niro	816	return 0;
34			return 1;
35	niro	532	}
36
37
38			static int read_str(const char line, void arg)
39			{
40			char **dest = arg;
41
42			free(*dest);
43			*dest = xstrdup(line);
44			return 1;
45			}
46
47
48			static int read_u32(const char line, void arg)
49			{
50	niro	816	(uint32_t)arg = bb_strtou32(line, NULL, 10);
51	niro	532	return errno == 0;
52			}
53
54
55			static int read_yn(const char line, void arg)
56			{
57			char *dest = arg;
58
59	niro	816	if (!strcasecmp("yes", line)) {
60	niro	532	*dest = 1;
61	niro	816	return 1;
62			}
63			if (!strcasecmp("no", line)) {
64	niro	532	*dest = 0;
65	niro	816	return 1;
66			}
67			return 0;
68	niro	532	}
69
70
71			/* find option 'code' in opt_list */
72	niro	816	struct option_set* FAST_FUNC find_option(struct option_set *opt_list, uint8_t code)
73	niro	532	{
74			while (opt_list && opt_list->data[OPT_CODE] < code)
75			opt_list = opt_list->next;
76
77	niro	816	if (opt_list && opt_list->data[OPT_CODE] == code)
78			return opt_list;
79			return NULL;
80	niro	532	}
81
82
83			/* add an option to the opt_list */
84			static void attach_option(struct option_set **opt_list,
85			const struct dhcp_option option, char buffer, int length)
86			{
87			struct option_set existing, new, **curr;
88
89			existing = find_option(*opt_list, option->code);
90	niro	816	if (!existing) {
91			DEBUG("Attaching option %02x to list", option->code);
92	niro	532
93	niro	816	#if ENABLE_FEATURE_UDHCP_RFC3397
94			if ((option->flags & TYPE_MASK) == OPTION_STR1035)
95			/* reuse buffer and length for RFC1035-formatted string */
96			buffer = (char *)dname_enc(NULL, 0, buffer, &length);
97			#endif
98
99	niro	532	/* make a new option */
100	niro	816	new = xmalloc(sizeof(*new));
101	niro	532	new->data = xmalloc(length + 2);
102			new->data[OPT_CODE] = option->code;
103			new->data[OPT_LEN] = length;
104			memcpy(new->data + 2, buffer, length);
105
106			curr = opt_list;
107			while (curr && (curr)->data[OPT_CODE] < option->code)
108			curr = &(*curr)->next;
109
110			new->next = *curr;
111			*curr = new;
112	niro	816	#if ENABLE_FEATURE_UDHCP_RFC3397
113			if ((option->flags & TYPE_MASK) == OPTION_STR1035 && buffer != NULL)
114			free(buffer);
115			#endif
116			return;
117	niro	532	}
118	niro	816
119			/* add it to an existing option */
120			DEBUG("Attaching option %02x to existing member of list", option->code);
121			if (option->flags & OPTION_LIST) {
122			#if ENABLE_FEATURE_UDHCP_RFC3397
123			if ((option->flags & TYPE_MASK) == OPTION_STR1035)
124			/* reuse buffer and length for RFC1035-formatted string */
125			buffer = (char *)dname_enc(existing->data + 2,
126			existing->data[OPT_LEN], buffer, &length);
127			#endif
128			if (existing->data[OPT_LEN] + length <= 255) {
129			existing->data = xrealloc(existing->data,
130			existing->data[OPT_LEN] + length + 3);
131			if ((option->flags & TYPE_MASK) == OPTION_STRING) {
132			/* ' ' can bring us to 256 - bad */
133			if (existing->data[OPT_LEN] + length >= 255)
134			return;
135			/* add space separator between STRING options in a list */
136			existing->data[existing->data[OPT_LEN] + 2] = ' ';
137			existing->data[OPT_LEN]++;
138			}
139			memcpy(existing->data + existing->data[OPT_LEN] + 2, buffer, length);
140			existing->data[OPT_LEN] += length;
141			} /* else, ignore the data, we could put this in a second option in the future */
142			#if ENABLE_FEATURE_UDHCP_RFC3397
143			if ((option->flags & TYPE_MASK) == OPTION_STR1035 && buffer != NULL)
144			free(buffer);
145			#endif
146			} /* else, ignore the new data */
147	niro	532	}
148
149
150			/* read a dhcp option and add it to opt_list */
151			static int read_opt(const char const_line, void arg)
152			{
153			struct option_set **opt_list = arg;
154			char opt, val, *endptr;
155	niro	816	char *line;
156	niro	532	const struct dhcp_option *option;
157	niro	816	int retval, length, idx;
158			char buffer[8] ALIGNED(4);
159	niro	532	uint16_t result_u16 = (uint16_t ) buffer;
160			uint32_t result_u32 = (uint32_t ) buffer;
161
162			/* Cheat, the only const line we'll actually get is "" */
163			line = (char *) const_line;
164			opt = strtok(line, " \t=");
165	niro	816	if (!opt)
166			return 0;
167	niro	532
168	niro	816	idx = index_in_strings(dhcp_option_strings, opt); /* NB: was strcasecmp! */
169			if (idx < 0)
170			return 0;
171			option = &dhcp_options[idx];
172	niro	532
173	niro	816	retval = 0;
174	niro	532	do {
175			val = strtok(NULL, ", \t");
176			if (!val) break;
177	niro	816	length = dhcp_option_lengths[option->flags & TYPE_MASK];
178	niro	532	retval = 0;
179			opt = buffer; /* new meaning for variable opt */
180			switch (option->flags & TYPE_MASK) {
181			case OPTION_IP:
182			retval = read_ip(val, buffer);
183			break;
184			case OPTION_IP_PAIR:
185			retval = read_ip(val, buffer);
186	niro	816	val = strtok(NULL, ", \t/-");
187			if (!val)
188			retval = 0;
189			if (retval)
190			retval = read_ip(val, buffer + 4);
191	niro	532	break;
192			case OPTION_STRING:
193	niro	816	#if ENABLE_FEATURE_UDHCP_RFC3397
194			case OPTION_STR1035:
195			#endif
196	niro	532	length = strlen(val);
197			if (length > 0) {
198			if (length > 254) length = 254;
199			opt = val;
200			retval = 1;
201			}
202			break;
203			case OPTION_BOOLEAN:
204			retval = read_yn(val, buffer);
205			break;
206			case OPTION_U8:
207			buffer[0] = strtoul(val, &endptr, 0);
208			retval = (endptr[0] == '\0');
209			break;
210	niro	816	/* htonX are macros in older libc's, using temp var
211			* in code below for safety */
212			/* TODO: use bb_strtoX? */
213			case OPTION_U16: {
214			unsigned long tmp = strtoul(val, &endptr, 0);
215			*result_u16 = htons(tmp);
216			retval = (endptr[0] == '\0' /&& tmp < 0x10000/);
217	niro	532	break;
218	niro	816	}
219			case OPTION_S16: {
220			long tmp = strtol(val, &endptr, 0);
221			*result_u16 = htons(tmp);
222	niro	532	retval = (endptr[0] == '\0');
223			break;
224	niro	816	}
225			case OPTION_U32: {
226			unsigned long tmp = strtoul(val, &endptr, 0);
227			*result_u32 = htonl(tmp);
228	niro	532	retval = (endptr[0] == '\0');
229			break;
230	niro	816	}
231			case OPTION_S32: {
232			long tmp = strtol(val, &endptr, 0);
233			*result_u32 = htonl(tmp);
234	niro	532	retval = (endptr[0] == '\0');
235			break;
236	niro	816	}
237	niro	532	default:
238			break;
239			}
240			if (retval)
241			attach_option(opt_list, option, opt, length);
242			} while (retval && option->flags & OPTION_LIST);
243			return retval;
244			}
245
246			static int read_staticlease(const char const_line, void arg)
247			{
248			char *line;
249			char *mac_string;
250			char *ip_string;
251			uint8_t *mac_bytes;
252			uint32_t *ip;
253
254			/* Allocate memory for addresses */
255			mac_bytes = xmalloc(sizeof(unsigned char) * 8);
256			ip = xmalloc(sizeof(uint32_t));
257
258			/* Read mac */
259			line = (char *) const_line;
260			mac_string = strtok(line, " \t");
261			read_mac(mac_string, mac_bytes);
262
263			/* Read ip */
264			ip_string = strtok(NULL, " \t");
265			read_ip(ip_string, ip);
266
267			addStaticLease(arg, mac_bytes, ip);
268
269	niro	816	if (ENABLE_UDHCP_DEBUG) printStaticLeases(arg);
270	niro	532
271			return 1;
272			}
273
274
275	niro	816	struct config_keyword {
276			const char *keyword;
277			int (handler)(const char line, void *var);
278			void *var;
279			const char *def;
280			};
281
282	niro	532	static const struct config_keyword keywords[] = {
283	niro	816	/* keyword handler variable address default */
284			{"start", read_ip, &(server_config.start_ip), "192.168.0.20"},
285			{"end", read_ip, &(server_config.end_ip), "192.168.0.254"},
286			{"interface", read_str, &(server_config.interface), "eth0"},
287			/* Avoid "max_leases value not sane" warning by setting default
288			* to default_end_ip - default_start_ip + 1: */
289			{"max_leases", read_u32, &(server_config.max_leases), "235"},
290			{"remaining", read_yn, &(server_config.remaining), "yes"},
291			{"auto_time", read_u32, &(server_config.auto_time), "7200"},
292			{"decline_time", read_u32, &(server_config.decline_time), "3600"},
293			{"conflict_time",read_u32, &(server_config.conflict_time),"3600"},
294			{"offer_time", read_u32, &(server_config.offer_time), "60"},
295			{"min_lease", read_u32, &(server_config.min_lease), "60"},
296			{"lease_file", read_str, &(server_config.lease_file), LEASES_FILE},
297			{"pidfile", read_str, &(server_config.pidfile), "/var/run/udhcpd.pid"},
298			{"siaddr", read_ip, &(server_config.siaddr), "0.0.0.0"},
299			/* keywords with no defaults must be last! */
300			{"option", read_opt, &(server_config.options), ""},
301			{"opt", read_opt, &(server_config.options), ""},
302			{"notify_file", read_str, &(server_config.notify_file), ""},
303			{"sname", read_str, &(server_config.sname), ""},
304			{"boot_file", read_str, &(server_config.boot_file), ""},
305			{"static_lease", read_staticlease, &(server_config.static_leases), ""},
306			/* ADDME: static lease */
307	niro	532	};
308	niro	816	enum { KWS_WITH_DEFAULTS = ARRAY_SIZE(keywords) - 6 };
309	niro	532
310	niro	816	void FAST_FUNC read_config(const char *file)
311	niro	532	{
312	niro	816	parser_t *parser;
313			const struct config_keyword *k;
314			unsigned i;
315			char *token[2];
316	niro	532
317	niro	816	for (i = 0; i < KWS_WITH_DEFAULTS; i++)
318			keywords[i].handler(keywords[i].def, keywords[i].var);
319	niro	532
320	niro	816	parser = config_open(file);
321			while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL)) {
322			for (k = keywords, i = 0; i < ARRAY_SIZE(keywords); k++, i++) {
323			if (!strcasecmp(token[0], k->keyword)) {
324			if (!k->handler(token[1], k->var)) {
325			bb_error_msg("can't parse line %u in %s",
326			parser->lineno, file);
327	niro	532	/* reset back to the default value */
328	niro	816	k->handler(k->def, k->var);
329	niro	532	}
330	niro	816	break;
331			}
332			}
333	niro	532	}
334	niro	816	config_close(parser);
335
336			server_config.start_ip = ntohl(server_config.start_ip);
337			server_config.end_ip = ntohl(server_config.end_ip);
338	niro	532	}
339
340
341	niro	816	void FAST_FUNC write_leases(void)
342	niro	532	{
343			int fp;
344			unsigned i;
345			time_t curr = time(0);
346			unsigned long tmp_time;
347
348	niro	816	fp = open_or_warn(server_config.lease_file, O_WRONLY\|O_CREAT\|O_TRUNC);
349	niro	532	if (fp < 0) {
350			return;
351			}
352
353			for (i = 0; i < server_config.max_leases; i++) {
354			if (leases[i].yiaddr != 0) {
355
356			/* screw with the time in the struct, for easier writing */
357			tmp_time = leases[i].expires;
358
359			if (server_config.remaining) {
360			if (lease_expired(&(leases[i])))
361			leases[i].expires = 0;
362			else leases[i].expires -= curr;
363			} /* else stick with the time we got */
364			leases[i].expires = htonl(leases[i].expires);
365			// FIXME: error check??
366			full_write(fp, &leases[i], sizeof(leases[i]));
367
368			/* then restore it when done */
369			leases[i].expires = tmp_time;
370			}
371			}
372			close(fp);
373
374			if (server_config.notify_file) {
375	niro	816	// TODO: vfork-based child creation
376	niro	532	char *cmd = xasprintf("%s %s", server_config.notify_file, server_config.lease_file);
377			system(cmd);
378			free(cmd);
379			}
380			}
381
382
383	niro	816	void FAST_FUNC read_leases(const char *file)
384	niro	532	{
385			int fp;
386	niro	816	unsigned i;
387	niro	532	struct dhcpOfferedAddr lease;
388
389	niro	816	fp = open_or_warn(file, O_RDONLY);
390	niro	532	if (fp < 0) {
391			return;
392			}
393
394	niro	816	i = 0;
395	niro	532	while (i < server_config.max_leases
396			&& full_read(fp, &lease, sizeof(lease)) == sizeof(lease)
397			) {
398			/* ADDME: is it a static lease */
399	niro	816	uint32_t y = ntohl(lease.yiaddr);
400			if (y >= server_config.start_ip && y <= server_config.end_ip) {
401	niro	532	lease.expires = ntohl(lease.expires);
402	niro	816	if (!server_config.remaining)
403			lease.expires -= time(NULL);
404	niro	532	if (!(add_lease(lease.chaddr, lease.yiaddr, lease.expires))) {
405			bb_error_msg("too many leases while loading %s", file);
406			break;
407			}
408			i++;
409			}
410			}
411			DEBUG("Read %d leases", i);
412			close(fp);
413			}