source: trunk/minix/servers/inet/inet_config.c@ 20

Last change on this file since 20 was 9, checked in by Mattia Monga, 14 years ago

Minix 3.1.2a
File size: 8.0 KB
Line 
1/*
2inet/inet_config.c
3
4Created: Nov 11, 1992 by Philip Homburg
5
6Modified: Apr 07, 2001 by Kees J. Bot
7 Read the configuration file and fill in the xx_conf[] arrays.
8
9Copyright 1995 Philip Homburg
10*/
11
12#define _MINIX_SOURCE 1
13#define _POSIX_SOURCE 1
14
15#include <stdlib.h>
16#include <unistd.h>
17#include <fcntl.h>
18#include <string.h>
19#include <errno.h>
20#include <sys/types.h>
21#include <sys/stat.h>
22#include <minix/type.h>
23#include <minix/sysutil.h>
24#include <minix/syslib.h>
25#include "inet_config.h"
26
27struct eth_conf eth_conf[IP_PORT_MAX];
28struct psip_conf psip_conf[IP_PORT_MAX];
29struct ip_conf ip_conf[IP_PORT_MAX];
30struct tcp_conf tcp_conf[IP_PORT_MAX];
31struct udp_conf udp_conf[IP_PORT_MAX];
32dev_t ip_dev;
33
34int eth_conf_nr;
35int psip_conf_nr;
36int ip_conf_nr;
37int tcp_conf_nr;
38int udp_conf_nr;
39
40int ip_forward_directed_bcast= 0; /* Default is off */
41
42static u8_t iftype[IP_PORT_MAX]; /* Interface in use as? */
43static int ifdefault= -1; /* Default network interface. */
44
45static void fatal(char *label)
46{
47 printf("init: %s: %s\n", label, strerror(errno));
48 exit(1);
49}
50
51static void check_rm(char *device)
52/* Check if a device is not among the living. */
53{
54 if (unlink(device) < 0) {
55 if (errno == ENOENT) return;
56 fatal(device);
57 }
58 printf("rm %s\n", device);
59}
60
61static void check_mknod(char *device, mode_t mode, int minor)
62/* Check if a device exists with the proper device number. */
63{
64 struct stat st;
65 dev_t dev;
66
67 dev= (ip_dev & 0xFF00) | minor;
68
69 if (stat(device, &st) < 0) {
70 if (errno != ENOENT) fatal(device);
71 } else {
72 if (S_ISCHR(st.st_mode) && st.st_rdev == dev) return;
73 if (unlink(device) < 0) fatal(device);
74 }
75
76 if (mknod(device, S_IFCHR | mode, dev) < 0) fatal(device);
77 printf("mknod %s c %d %d\n", device, (ip_dev >> 8), minor);
78}
79
80static void check_ln(char *old, char *new)
81/* Check if 'old' and 'new' are still properly linked. */
82{
83 struct stat st_old, st_new;
84
85 if (stat(old, &st_old) < 0) fatal(old);
86 if (stat(new, &st_new) < 0) {
87 if (errno != ENOENT) fatal(new);
88 } else {
89 if (st_new.st_dev == st_old.st_dev
90 && st_new.st_ino == st_old.st_ino) {
91 return;
92 }
93 if (unlink(new) < 0) fatal(new);
94 }
95
96 if (link(old, new) < 0) fatal(new);
97 printf("ln %s %s\n", old, new);
98}
99
100static void check_dev(int type, int ifno)
101/* Check if the device group with interface number 'ifno' exists and has the
102 * proper device numbers. If 'type' is -1 then the device group must be
103 * removed.
104 */
105{
106 static struct devlist {
107 char *defname;
108 mode_t mode;
109 u8_t minor_off;
110 } devlist[] = {
111 { "/dev/eth", 0600, ETH_DEV_OFF },
112 { "/dev/psip", 0600, PSIP_DEV_OFF },
113 { "/dev/ip", 0600, IP_DEV_OFF },
114 { "/dev/tcp", 0666, TCP_DEV_OFF },
115 { "/dev/udp", 0666, UDP_DEV_OFF },
116 };
117 struct devlist *dvp;
118 int i;
119 char device[sizeof("/dev/psip99")];
120 char *dp;
121
122 for (i= 0; i < sizeof(devlist) / sizeof(devlist[0]); i++) {
123 dvp= &devlist[i];
124 strcpy(device, dvp->defname);
125 dp= device + strlen(device);
126 if (ifno >= 10) *dp++ = '0' + (ifno / 10);
127 *dp++ = '0' + (ifno % 10);
128 *dp = 0;
129
130 if (type == 0
131 || (i == 0 && type != NETTYPE_ETH)
132 || (i == 1 && type != NETTYPE_PSIP)
133 ) {
134 check_rm(device);
135 if (ifno == ifdefault) check_rm(dvp->defname);
136 } else {
137 check_mknod(device, dvp->mode,
138 if2minor(ifno, dvp->minor_off));
139 if (ifno == ifdefault) check_ln(device, dvp->defname);
140 }
141 }
142}
143
144static int cfg_fd;
145static char word[16];
146static unsigned line;
147
148static void error(void)
149{
150 printf("inet: error on line %u\n", line);
151 exit(1);
152}
153
154static void token(int need)
155{
156 /* Read a word from the configuration file. Return a null string on
157 * EOF. Return a punctiation as a one character word. If 'need' is
158 * true then an actual word is expected at this point, so err out if
159 * not.
160 */
161 unsigned char *wp;
162 static unsigned char c= '\n';
163
164 wp= (unsigned char *) word;
165 *wp = 0;
166
167 while (c <= ' ') {
168 if (c == '\n') line++;
169 if (read(cfg_fd, &c, 1) != 1) {
170 if (need) error();
171 return;
172 }
173 }
174
175 do {
176 if (wp < (unsigned char *) word + sizeof(word)-1) *wp++ = c;
177 if (read(cfg_fd, &c, 1) != 1) c= ' ';
178 if (word[0] == ';' || word[0] == '{' || word[0] == '}') {
179 if (need) error();
180 break;
181 }
182 } while (c > ' ' && c != ';' && c != '{' && c != '}');
183 *wp = 0;
184}
185
186static unsigned number(char *str, unsigned max)
187{
188 /* Interpret a string as an unsigned decimal number, no bigger than
189 * 'max'. Return this number.
190 */
191 char *s;
192 unsigned n, d;
193
194 s= str;
195 n= 0;
196 while ((d= (*s - '0')) < 10 && n <= max) {
197 n= n * 10 + d;
198 s++;
199 }
200 if (*s != 0 || n > max) {
201 printf("inet: '%s' is not a number <= %u\n", str, max);
202 error();
203 }
204 return n;
205}
206
207void read_conf(void)
208{
209 int i, j, ifno, type, port, enable;
210 struct eth_conf *ecp;
211 struct psip_conf *pcp;
212 struct ip_conf *icp;
213 struct stat st;
214
215 /* Open the configuration file. */
216 if ((cfg_fd= open(PATH_INET_CONF, O_RDONLY)) == -1)
217 fatal(PATH_INET_CONF);
218
219 ecp= eth_conf;
220 pcp= psip_conf;
221 icp= ip_conf;
222
223 while (token(0), word[0] != 0) {
224 if (strncmp(word, "eth", 3) == 0) {
225 ecp->ec_ifno= ifno= number(word+3, IP_PORT_MAX-1);
226 type= NETTYPE_ETH;
227 port= eth_conf_nr;
228 token(1);
229 if (strcmp(word, "vlan") == 0) {
230 token(1);
231 ecp->ec_vlan= number(word, (1<<12)-1);
232 token(1);
233 if (strncmp(word, "eth", 3) != 0) {
234 printf(
235 "inet: VLAN eth%d can't be built on %s\n",
236 ifno, word);
237 exit(1);
238 }
239 ecp->ec_port= number(word+3, IP_PORT_MAX-1);
240 } else {
241 ecp->ec_task= alloc(strlen(word)+1);
242 strcpy(ecp->ec_task, word);
243 token(1);
244 ecp->ec_port= number(word, IP_PORT_MAX-1);
245 }
246 ecp++;
247 eth_conf_nr++;
248 } else
249 if (strncmp(word, "psip", 4) == 0) {
250 pcp->pc_ifno= ifno= number(word+4, IP_PORT_MAX-1);
251 type= NETTYPE_PSIP;
252 port= psip_conf_nr;
253 pcp++;
254 psip_conf_nr++;
255 } else {
256 printf("inet: Unknown device '%s'\n", word);
257 error();
258 }
259 iftype[ifno]= type;
260 icp->ic_ifno= ifno;
261 icp->ic_devtype= type;
262 icp->ic_port= port;
263 tcp_conf[tcp_conf_nr].tc_port= ip_conf_nr;
264 udp_conf[udp_conf_nr].uc_port= ip_conf_nr;
265
266 enable= 7; /* 1 = IP, 2 = TCP, 4 = UDP */
267
268 token(0);
269 if (word[0] == '{') {
270 token(0);
271 while (word[0] != '}') {
272 if (strcmp(word, "default") == 0) {
273 if (ifdefault != -1) {
274 printf(
275 "inet: ip%d and ip%d can't both be default\n",
276 ifdefault, ifno);
277 error();
278 }
279 ifdefault= ifno;
280 token(0);
281 } else
282 if (strcmp(word, "no") == 0) {
283 token(1);
284 if (strcmp(word, "ip") == 0) {
285 enable= 0;
286 } else
287 if (strcmp(word, "tcp") == 0) {
288 enable &= ~2;
289 } else
290 if (strcmp(word, "udp") == 0) {
291 enable &= ~4;
292 } else {
293 printf(
294 "inet: Can't do 'no %s'\n",
295 word);
296 exit(1);
297 }
298 token(0);
299 } else {
300 printf("inet: Unknown option '%s'\n",
301 word);
302 exit(1);
303 }
304 if (word[0] == ';') token(0);
305 else
306 if (word[0] != '}') error();
307 }
308 token(0);
309 }
310 if (word[0] != ';' && word[0] != 0) error();
311
312 if (enable & 1) icp++, ip_conf_nr++;
313 if (enable & 2) tcp_conf_nr++;
314 if (enable & 4) udp_conf_nr++;
315 }
316
317 if (ifdefault == -1) {
318 printf("inet: No networks or no default network defined\n");
319 exit(1);
320 }
321
322 /* Translate VLAN network references to port numbers. */
323 for (i= 0; i < eth_conf_nr; i++) {
324 ecp= &eth_conf[i];
325 if (eth_is_vlan(ecp)) {
326 for (j= 0; j < eth_conf_nr; j++) {
327 if (eth_conf[j].ec_ifno == ecp->ec_port
328 && !eth_is_vlan(&eth_conf[j])
329 ) {
330 ecp->ec_port= j;
331 break;
332 }
333 }
334 if (j == eth_conf_nr) {
335 printf(
336 "inet: VLAN eth%d can't be built on eth%d\n",
337 ecp->ec_ifno, ecp->ec_port);
338 exit(1);
339 }
340 }
341 }
342
343 /* Set umask 0 so we can creat mode 666 devices. */
344 (void) umask(0);
345
346 /* See what the device number of /dev/ip is. That's what we
347 * used last time for the network devices, so we keep doing so.
348 */
349 if (stat("/dev/ip", &st) < 0) fatal("/dev/ip");
350 ip_dev= st.st_rdev;
351
352 for (i= 0; i < IP_PORT_MAX; i++) {
353 /* Create network devices. */
354 check_dev(iftype[i], i);
355 }
356}
357
358void *alloc(size_t size)
359{
360 /* Allocate memory on the heap with sbrk(). */
361
362 return sbrk((size + (sizeof(char *) - 1)) & ~(sizeof(char *) - 1));
363}
364
365/*
366 * $PchId: inet_config.c,v 1.10 2003/08/21 09:26:02 philip Exp $
367 */
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