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authorRuss Dill <Russ.Dill@asu.edu>2002-10-14 21:41:28 +0000
committerRuss Dill <Russ.Dill@asu.edu>2002-10-14 21:41:28 +0000
commit61fb48930f45aa536584b2047f9e703186e8f69f (patch)
treee3b93e0a694be81939f8c4762553c43ffdb9b10b /networking/udhcp/files.c
parent9060a7315980bb05f42eab76b88746d43e138188 (diff)
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added full udhcp integration
Diffstat (limited to 'networking/udhcp/files.c')
-rw-r--r--networking/udhcp/files.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c
new file mode 100644
index 000000000..842e0f2db
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+++ b/networking/udhcp/files.c
@@ -0,0 +1,284 @@
1/*
2 * files.c -- DHCP server file manipulation *
3 * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
4 */
5
6#include <stdio.h>
7#include <sys/socket.h>
8#include <arpa/inet.h>
9#include <string.h>
10#include <stdlib.h>
11#include <time.h>
12#include <ctype.h>
13#include <netdb.h>
14
15#include "debug.h"
16#include "dhcpd.h"
17#include "files.h"
18#include "options.h"
19#include "leases.h"
20
21/* on these functions, make sure you datatype matches */
22static int read_ip(char *line, void *arg)
23{
24 struct in_addr *addr = arg;
25 struct hostent *host;
26 int retval = 1;
27
28 if (!inet_aton(line, addr)) {
29 if ((host = gethostbyname(line)))
30 addr->s_addr = *((unsigned long *) host->h_addr_list[0]);
31 else retval = 0;
32 }
33 return retval;
34}
35
36
37static int read_str(char *line, void *arg)
38{
39 char **dest = arg;
40
41 if (*dest) free(*dest);
42 *dest = strdup(line);
43
44 return 1;
45}
46
47
48static int read_u32(char *line, void *arg)
49{
50 u_int32_t *dest = arg;
51 char *endptr;
52 *dest = strtoul(line, &endptr, 0);
53 return endptr[0] == '\0';
54}
55
56
57static int read_yn(char *line, void *arg)
58{
59 char *dest = arg;
60 int retval = 1;
61
62 if (!strcasecmp("yes", line))
63 *dest = 1;
64 else if (!strcasecmp("no", line))
65 *dest = 0;
66 else retval = 0;
67
68 return retval;
69}
70
71
72/* read a dhcp option and add it to opt_list */
73static int read_opt(char *line, void *arg)
74{
75 struct option_set **opt_list = arg;
76 char *opt, *val, *endptr;
77 struct dhcp_option *option = NULL;
78 int retval = 0, length = 0;
79 char buffer[255];
80 u_int16_t result_u16;
81 u_int32_t result_u32;
82 int i;
83
84 if (!(opt = strtok(line, " \t="))) return 0;
85
86 for (i = 0; options[i].code; i++)
87 if (!strcmp(options[i].name, opt))
88 option = &(options[i]);
89
90 if (!option) return 0;
91
92 do {
93 val = strtok(NULL, ", \t");
94 if (val) {
95 length = option_lengths[option->flags & TYPE_MASK];
96 retval = 0;
97 switch (option->flags & TYPE_MASK) {
98 case OPTION_IP:
99 retval = read_ip(val, buffer);
100 break;
101 case OPTION_IP_PAIR:
102 retval = read_ip(val, buffer);
103 if (!(val = strtok(NULL, ", \t/-"))) retval = 0;
104 if (retval) retval = read_ip(val, buffer + 4);
105 break;
106 case OPTION_STRING:
107 length = strlen(val);
108 if (length > 0) {
109 if (length > 254) length = 254;
110 memcpy(buffer, val, length);
111 retval = 1;
112 }
113 break;
114 case OPTION_BOOLEAN:
115 retval = read_yn(val, buffer);
116 break;
117 case OPTION_U8:
118 buffer[0] = strtoul(val, &endptr, 0);
119 retval = (endptr[0] == '\0');
120 break;
121 case OPTION_U16:
122 result_u16 = htons(strtoul(val, &endptr, 0));
123 memcpy(buffer, &result_u16, 2);
124 retval = (endptr[0] == '\0');
125 break;
126 case OPTION_S16:
127 result_u16 = htons(strtol(val, &endptr, 0));
128 memcpy(buffer, &result_u16, 2);
129 retval = (endptr[0] == '\0');
130 break;
131 case OPTION_U32:
132 result_u32 = htonl(strtoul(val, &endptr, 0));
133 memcpy(buffer, &result_u32, 4);
134 retval = (endptr[0] == '\0');
135 break;
136 case OPTION_S32:
137 result_u32 = htonl(strtol(val, &endptr, 0));
138 memcpy(buffer, &result_u32, 4);
139 retval = (endptr[0] == '\0');
140 break;
141 default:
142 break;
143 }
144 if (retval)
145 attach_option(opt_list, option, buffer, length);
146 };
147 } while (val && retval && option->flags & OPTION_LIST);
148 return retval;
149}
150
151
152static struct config_keyword keywords[] = {
153 /* keyword[14] handler variable address default[20] */
154 {"start", read_ip, &(server_config.start), "192.168.0.20"},
155 {"end", read_ip, &(server_config.end), "192.168.0.254"},
156 {"interface", read_str, &(server_config.interface), "eth0"},
157 {"option", read_opt, &(server_config.options), ""},
158 {"opt", read_opt, &(server_config.options), ""},
159 {"max_leases", read_u32, &(server_config.max_leases), "254"},
160 {"remaining", read_yn, &(server_config.remaining), "yes"},
161 {"auto_time", read_u32, &(server_config.auto_time), "7200"},
162 {"decline_time",read_u32, &(server_config.decline_time),"3600"},
163 {"conflict_time",read_u32,&(server_config.conflict_time),"3600"},
164 {"offer_time", read_u32, &(server_config.offer_time), "60"},
165 {"min_lease", read_u32, &(server_config.min_lease), "60"},
166 {"lease_file", read_str, &(server_config.lease_file), "/var/lib/misc/udhcpd.leases"},
167 {"pidfile", read_str, &(server_config.pidfile), "/var/run/udhcpd.pid"},
168 {"notify_file", read_str, &(server_config.notify_file), ""},
169 {"siaddr", read_ip, &(server_config.siaddr), "0.0.0.0"},
170 {"sname", read_str, &(server_config.sname), ""},
171 {"boot_file", read_str, &(server_config.boot_file), ""},
172 /*ADDME: static lease */
173 {"", NULL, NULL, ""}
174};
175
176
177int read_config(char *file)
178{
179 FILE *in;
180 char buffer[80], orig[80], *token, *line;
181 int i;
182
183 for (i = 0; strlen(keywords[i].keyword); i++)
184 if (strlen(keywords[i].def))
185 keywords[i].handler(keywords[i].def, keywords[i].var);
186
187 if (!(in = fopen(file, "r"))) {
188 LOG(LOG_ERR, "unable to open config file: %s", file);
189 return 0;
190 }
191
192 while (fgets(buffer, 80, in)) {
193 if (strchr(buffer, '\n')) *(strchr(buffer, '\n')) = '\0';
194 strncpy(orig, buffer, 80);
195 if (strchr(buffer, '#')) *(strchr(buffer, '#')) = '\0';
196 token = buffer + strspn(buffer, " \t");
197 if (*token == '\0') continue;
198 line = token + strcspn(token, " \t=");
199 if (*line == '\0') continue;
200 *line = '\0';
201 line++;
202
203 /* eat leading whitespace */
204 line = line + strspn(line, " \t=");
205 /* eat trailing whitespace */
206 for (i = strlen(line); i > 0 && isspace(line[i - 1]); i--);
207 line[i] = '\0';
208
209 for (i = 0; strlen(keywords[i].keyword); i++)
210 if (!strcasecmp(token, keywords[i].keyword))
211 if (!keywords[i].handler(line, keywords[i].var)) {
212 LOG(LOG_ERR, "unable to parse '%s'", orig);
213 /* reset back to the default value */
214 keywords[i].handler(keywords[i].def, keywords[i].var);
215 }
216 }
217 fclose(in);
218 return 1;
219}
220
221
222void write_leases(void)
223{
224 FILE *fp;
225 unsigned int i;
226 char buf[255];
227 time_t curr = time(0);
228 unsigned long lease_time;
229
230 if (!(fp = fopen(server_config.lease_file, "w"))) {
231 LOG(LOG_ERR, "Unable to open %s for writing", server_config.lease_file);
232 return;
233 }
234
235 for (i = 0; i < server_config.max_leases; i++) {
236 if (leases[i].yiaddr != 0) {
237 if (server_config.remaining) {
238 if (lease_expired(&(leases[i])))
239 lease_time = 0;
240 else lease_time = leases[i].expires - curr;
241 } else lease_time = leases[i].expires;
242 lease_time = htonl(lease_time);
243 fwrite(leases[i].chaddr, 16, 1, fp);
244 fwrite(&(leases[i].yiaddr), 4, 1, fp);
245 fwrite(&lease_time, 4, 1, fp);
246 }
247 }
248 fclose(fp);
249
250 if (server_config.notify_file) {
251 sprintf(buf, "%s %s", server_config.notify_file, server_config.lease_file);
252 system(buf);
253 }
254}
255
256
257void read_leases(char *file)
258{
259 FILE *fp;
260 unsigned int i = 0;
261 struct dhcpOfferedAddr lease;
262
263 if (!(fp = fopen(file, "r"))) {
264 LOG(LOG_ERR, "Unable to open %s for reading", file);
265 return;
266 }
267
268 while (i < server_config.max_leases && (fread(&lease, sizeof lease, 1, fp) == 1)) {
269 /* ADDME: is it a static lease */
270 if (lease.yiaddr >= server_config.start && lease.yiaddr <= server_config.end) {
271 lease.expires = ntohl(lease.expires);
272 if (!server_config.remaining) lease.expires -= time(0);
273 if (!(add_lease(lease.chaddr, lease.yiaddr, lease.expires))) {
274 LOG(LOG_WARNING, "Too many leases while loading %s\n", file);
275 break;
276 }
277 i++;
278 }
279 }
280 DEBUG(LOG_INFO, "Read %d leases", i);
281 fclose(fp);
282}
283
284
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