1 /* vi: set sw=4 ts=4: */
3 * files.c -- DHCP server file manipulation *
4 * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
7 #include <sys/socket.h>
15 #include <netinet/ether.h>
16 #include "static_leases.h"
24 * Domain names may have 254 chars, and string options can be 254
25 * chars long. However, 80 bytes will be enough for most, and won't
26 * hog up memory. If you have a special application, change it
28 #define READ_CONFIG_BUF_SIZE 80
30 /* on these functions, make sure you datatype matches */
31 static int read_ip(const char *line, void *arg)
33 struct in_addr *addr = arg;
37 if (!inet_aton(line, addr)) {
38 host = gethostbyname(line);
40 addr->s_addr = *((unsigned long *) host->h_addr_list[0]);
46 static int read_mac(const char *line, void *arg)
48 uint8_t *mac_bytes = arg;
49 struct ether_addr *temp_ether_addr;
52 temp_ether_addr = ether_aton(line);
54 if(temp_ether_addr == NULL)
57 memcpy(mac_bytes, temp_ether_addr, 6);
63 static int read_str(const char *line, void *arg)
74 static int read_u32(const char *line, void *arg)
76 return safe_strtou32(line, (uint32_t*)arg) == 0;
80 static int read_yn(const char *line, void *arg)
85 if (!strcasecmp("yes", line))
87 else if (!strcasecmp("no", line))
95 /* find option 'code' in opt_list */
96 struct option_set *find_option(struct option_set *opt_list, char code)
98 while (opt_list && opt_list->data[OPT_CODE] < code)
99 opt_list = opt_list->next;
101 if (opt_list && opt_list->data[OPT_CODE] == code) return opt_list;
106 /* add an option to the opt_list */
107 static void attach_option(struct option_set **opt_list, struct dhcp_option *option, char *buffer, int length)
109 struct option_set *existing, *new, **curr;
111 /* add it to an existing option */
112 if ((existing = find_option(*opt_list, option->code))) {
113 DEBUG("Attaching option %s to existing member of list", option->name);
114 if (option->flags & OPTION_LIST) {
115 if (existing->data[OPT_LEN] + length <= 255) {
116 existing->data = realloc(existing->data,
117 existing->data[OPT_LEN] + length + 2);
118 memcpy(existing->data + existing->data[OPT_LEN] + 2, buffer, length);
119 existing->data[OPT_LEN] += length;
120 } /* else, ignore the data, we could put this in a second option in the future */
121 } /* else, ignore the new data */
123 DEBUG("Attaching option %s to list", option->name);
125 /* make a new option */
126 new = xmalloc(sizeof(struct option_set));
127 new->data = xmalloc(length + 2);
128 new->data[OPT_CODE] = option->code;
129 new->data[OPT_LEN] = length;
130 memcpy(new->data + 2, buffer, length);
133 while (*curr && (*curr)->data[OPT_CODE] < option->code)
134 curr = &(*curr)->next;
142 /* read a dhcp option and add it to opt_list */
143 static int read_opt(const char *const_line, void *arg)
145 struct option_set **opt_list = arg;
146 char *opt, *val, *endptr;
147 struct dhcp_option *option;
148 int retval = 0, length;
151 uint16_t *result_u16 = (uint16_t *) buffer;
152 uint32_t *result_u32 = (uint32_t *) buffer;
154 /* Cheat, the only const line we'll actually get is "" */
155 line = (char *) const_line;
156 if (!(opt = strtok(line, " \t="))) return 0;
158 for (option = dhcp_options; option->code; option++)
159 if (!strcasecmp(option->name, opt))
162 if (!option->code) return 0;
165 if (!(val = strtok(NULL, ", \t"))) break;
166 length = option_lengths[option->flags & TYPE_MASK];
168 opt = buffer; /* new meaning for variable opt */
169 switch (option->flags & TYPE_MASK) {
171 retval = read_ip(val, buffer);
174 retval = read_ip(val, buffer);
175 if (!(val = strtok(NULL, ", \t/-"))) retval = 0;
176 if (retval) retval = read_ip(val, buffer + 4);
179 length = strlen(val);
181 if (length > 254) length = 254;
187 retval = read_yn(val, buffer);
190 buffer[0] = strtoul(val, &endptr, 0);
191 retval = (endptr[0] == '\0');
194 *result_u16 = htons(strtoul(val, &endptr, 0));
195 retval = (endptr[0] == '\0');
198 *result_u16 = htons(strtol(val, &endptr, 0));
199 retval = (endptr[0] == '\0');
202 *result_u32 = htonl(strtoul(val, &endptr, 0));
203 retval = (endptr[0] == '\0');
206 *result_u32 = htonl(strtol(val, &endptr, 0));
207 retval = (endptr[0] == '\0');
213 attach_option(opt_list, option, opt, length);
214 } while (retval && option->flags & OPTION_LIST);
218 static int read_staticlease(const char *const_line, void *arg)
228 /* Allocate memory for addresses */
229 mac_bytes = xmalloc(sizeof(unsigned char) * 8);
230 ip = xmalloc(sizeof(uint32_t));
233 line = (char *) const_line;
234 mac_string = strtok(line, " \t");
235 read_mac(mac_string, mac_bytes);
238 ip_string = strtok(NULL, " \t");
239 read_ip(ip_string, ip);
241 addStaticLease(arg, mac_bytes, ip);
243 if (ENABLE_FEATURE_UDHCP_DEBUG) printStaticLeases(arg);
250 static const struct config_keyword keywords[] = {
251 /* keyword handler variable address default */
252 {"start", read_ip, &(server_config.start), "192.168.0.20"},
253 {"end", read_ip, &(server_config.end), "192.168.0.254"},
254 {"interface", read_str, &(server_config.interface), "eth0"},
255 {"option", read_opt, &(server_config.options), ""},
256 {"opt", read_opt, &(server_config.options), ""},
257 {"max_leases", read_u32, &(server_config.max_leases), "254"},
258 {"remaining", read_yn, &(server_config.remaining), "yes"},
259 {"auto_time", read_u32, &(server_config.auto_time), "7200"},
260 {"decline_time",read_u32, &(server_config.decline_time),"3600"},
261 {"conflict_time",read_u32,&(server_config.conflict_time),"3600"},
262 {"offer_time", read_u32, &(server_config.offer_time), "60"},
263 {"min_lease", read_u32, &(server_config.min_lease), "60"},
264 {"lease_file", read_str, &(server_config.lease_file), LEASES_FILE},
265 {"pidfile", read_str, &(server_config.pidfile), "/var/run/udhcpd.pid"},
266 {"notify_file", read_str, &(server_config.notify_file), ""},
267 {"siaddr", read_ip, &(server_config.siaddr), "0.0.0.0"},
268 {"sname", read_str, &(server_config.sname), ""},
269 {"boot_file", read_str, &(server_config.boot_file), ""},
270 {"static_lease",read_staticlease, &(server_config.static_leases), ""},
271 /*ADDME: static lease */
276 int read_config(const char *file)
279 char buffer[READ_CONFIG_BUF_SIZE], *token, *line;
282 for (i = 0; keywords[i].keyword[0]; i++)
283 if (keywords[i].def[0])
284 keywords[i].handler(keywords[i].def, keywords[i].var);
286 if (!(in = fopen(file, "r"))) {
287 bb_error_msg("Unable to open config file: %s", file);
291 while (fgets(buffer, READ_CONFIG_BUF_SIZE, in)) {
292 char debug_orig[READ_CONFIG_BUF_SIZE];
295 if (strchr(buffer, '\n')) *(strchr(buffer, '\n')) = '\0';
296 if (ENABLE_FEATURE_UDHCP_DEBUG) strcpy(debug_orig, buffer);
297 if (strchr(buffer, '#')) *(strchr(buffer, '#')) = '\0';
299 if (!(token = strtok(buffer, " \t"))) continue;
300 if (!(line = strtok(NULL, ""))) continue;
302 /* eat leading whitespace */
303 line = line + strspn(line, " \t=");
304 /* eat trailing whitespace */
305 for (i = strlen(line); i > 0 && isspace(line[i - 1]); i--);
308 for (i = 0; keywords[i].keyword[0]; i++)
309 if (!strcasecmp(token, keywords[i].keyword))
310 if (!keywords[i].handler(line, keywords[i].var)) {
311 bb_error_msg("Failure parsing line %d of %s", lm, file);
312 if (ENABLE_FEATURE_UDHCP_DEBUG)
313 bb_error_msg("unable to parse '%s'", debug_orig);
314 /* reset back to the default value */
315 keywords[i].handler(keywords[i].def, keywords[i].var);
323 void write_leases(void)
328 time_t curr = time(0);
329 unsigned long tmp_time;
331 if (!(fp = fopen(server_config.lease_file, "w"))) {
332 bb_error_msg("Unable to open %s for writing", server_config.lease_file);
336 for (i = 0; i < server_config.max_leases; i++) {
337 if (leases[i].yiaddr != 0) {
339 /* screw with the time in the struct, for easier writing */
340 tmp_time = leases[i].expires;
342 if (server_config.remaining) {
343 if (lease_expired(&(leases[i])))
344 leases[i].expires = 0;
345 else leases[i].expires -= curr;
346 } /* else stick with the time we got */
347 leases[i].expires = htonl(leases[i].expires);
348 fwrite(&leases[i], sizeof(struct dhcpOfferedAddr), 1, fp);
350 /* Then restore it when done. */
351 leases[i].expires = tmp_time;
356 if (server_config.notify_file) {
357 sprintf(buf, "%s %s", server_config.notify_file, server_config.lease_file);
363 void read_leases(const char *file)
367 struct dhcpOfferedAddr lease;
369 if (!(fp = fopen(file, "r"))) {
370 bb_error_msg("Unable to open %s for reading", file);
374 while (i < server_config.max_leases && (fread(&lease, sizeof lease, 1, fp) == 1)) {
375 /* ADDME: is it a static lease */
376 if (lease.yiaddr >= server_config.start && lease.yiaddr <= server_config.end) {
377 lease.expires = ntohl(lease.expires);
378 if (!server_config.remaining) lease.expires -= time(0);
379 if (!(add_lease(lease.chaddr, lease.yiaddr, lease.expires))) {
380 bb_error_msg("Too many leases while loading %s", file);
386 DEBUG("Read %d leases", i);