1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1988, 1992 The University of Utah and the Center
5 * for Software Science (CSS).
6 * Copyright (c) 1992, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * the Center for Software Science of the University of Utah Computer
11 * Science Department. CSS requests users of this software to return
12 * to [email protected] any improvements that they make and grant
13 * CSS redistribution rights.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 3. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * from: @(#)parseconf.c 8.1 (Berkeley) 6/4/93
40 *
41 * From: Utah Hdr: parseconf.c 3.1 92/07/06
42 * Author: Jeff Forys, University of Utah CSS
43 */
44
45 #ifndef lint
46 #if 0
47 static const char sccsid[] = "@(#)parseconf.c 8.1 (Berkeley) 6/4/93";
48 #endif
49 #endif /* not lint */
50
51 #include <sys/param.h>
52 #include <sys/stat.h>
53 #include <sys/time.h>
54
55 #include <ctype.h>
56 #include <dirent.h>
57 #include <fcntl.h>
58 #include <signal.h>
59 #include <stdio.h>
60 #include <stdlib.h>
61 #include <string.h>
62 #include <syslog.h>
63 #include "defs.h"
64
65 /*
66 ** ParseConfig -- parse the config file into linked list of clients.
67 **
68 ** Parameters:
69 ** None.
70 **
71 ** Returns:
72 ** 1 on success, 0 otherwise.
73 **
74 ** Side Effects:
75 ** - Linked list of clients will be (re)allocated.
76 **
77 ** Warnings:
78 ** - GetBootFiles() must be called before this routine
79 ** to create a linked list of default boot files.
80 */
81 int
ParseConfig(void)82 ParseConfig(void)
83 {
84 FILE *fp;
85 CLIENT *client;
86 u_int8_t *addr;
87 char line[C_LINELEN];
88 char *cp, *bcp;
89 int i, j;
90 int omask, linecnt = 0;
91
92 if (BootAny) /* ignore config file */
93 return(1);
94
95 FreeClients(); /* delete old list of clients */
96
97 if ((fp = fopen(ConfigFile, "r")) == NULL) {
98 syslog(LOG_ERR, "ParseConfig: can't open config file (%s)",
99 ConfigFile);
100 return(0);
101 }
102
103 /*
104 * We've got to block SIGHUP to prevent reconfiguration while
105 * dealing with the linked list of Clients. This can be done
106 * when actually linking the new client into the list, but
107 * this could have unexpected results if the server was HUP'd
108 * whilst reconfiguring. Hence, it is done here.
109 */
110 omask = sigblock(sigmask(SIGHUP));
111
112 /*
113 * GETSTR positions `bcp' at the start of the current token,
114 * and null terminates it. `cp' is positioned at the start
115 * of the next token. spaces & commas are separators.
116 */
117 #define GETSTR while (isspace(*cp) || *cp == ',') cp++; \
118 bcp = cp; \
119 while (*cp && *cp!=',' && !isspace(*cp)) cp++; \
120 if (*cp) *cp++ = '\0'
121
122 /*
123 * For each line, parse it into a new CLIENT struct.
124 */
125 while (fgets(line, C_LINELEN, fp) != NULL) {
126 linecnt++; /* line counter */
127
128 if (*line == '\0' || *line == '#') /* ignore comment */
129 continue;
130
131 if ((cp = strchr(line,'#')) != NULL) /* trash comments */
132 *cp = '\0';
133
134 cp = line; /* init `cp' */
135 GETSTR; /* get RMP addr */
136 if (bcp == cp) /* all delimiters */
137 continue;
138
139 /*
140 * Get an RMP address from a string. Abort on failure.
141 */
142 if ((addr = ParseAddr(bcp)) == NULL) {
143 syslog(LOG_ERR,
144 "ParseConfig: line %d: can't parse <%s>",
145 linecnt, bcp);
146 continue;
147 }
148
149 if ((client = NewClient(addr)) == NULL) /* alloc new client */
150 continue;
151
152 GETSTR; /* get first file */
153
154 /*
155 * If no boot files are spec'd, use the default list.
156 * Otherwise, validate each file (`bcp') against the
157 * list of boot-able files.
158 */
159 i = 0;
160 if (bcp == cp) /* no files spec'd */
161 for (; i < C_MAXFILE && BootFiles[i] != NULL; i++)
162 client->files[i] = BootFiles[i];
163 else {
164 do {
165 /*
166 * For each boot file spec'd, make sure it's
167 * in our list. If so, include a pointer to
168 * it in the CLIENT's list of boot files.
169 */
170 for (j = 0; ; j++) {
171 if (j==C_MAXFILE||BootFiles[j]==NULL) {
172 syslog(LOG_ERR, "ParseConfig: line %d: no boot file (%s)",
173 linecnt, bcp);
174 break;
175 }
176 if (STREQN(BootFiles[j], bcp)) {
177 if (i < C_MAXFILE)
178 client->files[i++] =
179 BootFiles[j];
180 else
181 syslog(LOG_ERR, "ParseConfig: line %d: too many boot files (%s)",
182 linecnt, bcp);
183 break;
184 }
185 }
186 GETSTR; /* get next file */
187 } while (bcp != cp);
188
189 /*
190 * Restricted list of boot files were spec'd,
191 * however, none of them were found. Since we
192 * apparently can't let them boot "just anything",
193 * the entire record is invalidated.
194 */
195 if (i == 0) {
196 FreeClient(client);
197 continue;
198 }
199 }
200
201 /*
202 * Link this client into the linked list of clients.
203 * SIGHUP has already been blocked.
204 */
205 if (Clients)
206 client->next = Clients;
207 Clients = client;
208 }
209
210 (void) fclose(fp); /* close config file */
211
212 (void) sigsetmask(omask); /* reset signal mask */
213
214 return(1); /* return success */
215 }
216
217 /*
218 ** ParseAddr -- Parse a string containing an RMP address.
219 **
220 ** This routine is fairly liberal at parsing an RMP address. The
221 ** address must contain 6 octets consisting of between 0 and 2 hex
222 ** chars (upper/lower case) separated by colons. If two colons are
223 ** together (e.g. "::", the octet between them is recorded as being
224 ** zero. Hence, the following addrs are all valid and parse to the
225 ** same thing:
226 **
227 ** 08:00:09:00:66:ad 8::9:0:66:AD 8::9::66:aD
228 **
229 ** For clarity, an RMP address is really an Ethernet address, but
230 ** since the HP boot code uses IEEE 802.3, it's really an IEEE
231 ** 802.3 address. Of course, all of these are identical.
232 **
233 ** Parameters:
234 ** str - string representation of an RMP address.
235 **
236 ** Returns:
237 ** pointer to a static array of RMP_ADDRLEN bytes.
238 **
239 ** Side Effects:
240 ** None.
241 **
242 ** Warnings:
243 ** - The return value points to a static buffer; it must
244 ** be copied if it's to be saved.
245 */
246 u_int8_t *
ParseAddr(char * str)247 ParseAddr(char *str)
248 {
249 static u_int8_t addr[RMP_ADDRLEN];
250 char *cp;
251 unsigned i;
252 int part, subpart;
253
254 memset((char *)&addr[0], 0, RMP_ADDRLEN); /* zero static buffer */
255
256 part = subpart = 0;
257 for (cp = str; *cp; cp++) {
258 /*
259 * A colon (`:') must be used to delimit each octet.
260 */
261 if (*cp == ':') {
262 if (++part == RMP_ADDRLEN) /* too many parts */
263 return(NULL);
264 subpart = 0;
265 continue;
266 }
267
268 /*
269 * Convert hex character to an integer.
270 */
271 if (isdigit(*cp))
272 i = *cp - '0';
273 else {
274 i = (isupper(*cp)? tolower(*cp): *cp) - 'a' + 10;
275 if (i < 10 || i > 15) /* not a hex char */
276 return(NULL);
277 }
278
279 if (subpart++) {
280 if (subpart > 2) /* too many hex chars */
281 return(NULL);
282 addr[part] <<= 4;
283 }
284 addr[part] |= i;
285 }
286
287 if (part != (RMP_ADDRLEN-1)) /* too few parts */
288 return(NULL);
289
290 return(&addr[0]);
291 }
292
293 /*
294 ** GetBootFiles -- record list of files in current (boot) directory.
295 **
296 ** Parameters:
297 ** None.
298 **
299 ** Returns:
300 ** Number of boot files on success, 0 on failure.
301 **
302 ** Side Effects:
303 ** Strings in `BootFiles' are freed/allocated.
304 **
305 ** Warnings:
306 ** - After this routine is called, ParseConfig() must be
307 ** called to re-order it's list of boot file pointers.
308 */
309 int
GetBootFiles(void)310 GetBootFiles(void)
311 {
312 DIR *dfd;
313 struct stat statb;
314 struct dirent *dp;
315 int i;
316
317 /*
318 * Free the current list of boot files.
319 */
320 for (i = 0; i < C_MAXFILE && BootFiles[i] != NULL; i++) {
321 FreeStr(BootFiles[i]);
322 BootFiles[i] = NULL;
323 }
324
325 /*
326 * Open current directory to read boot file names.
327 */
328 if ((dfd = opendir(".")) == NULL) { /* open BootDir */
329 syslog(LOG_ERR, "GetBootFiles: can't open directory (%s)\n",
330 BootDir);
331 return(0);
332 }
333
334 /*
335 * Read each boot file name and allocate space for it in the
336 * list of boot files (BootFiles). All boot files read after
337 * C_MAXFILE will be ignored.
338 */
339 i = 0;
340 for (dp = readdir(dfd); dp != NULL; dp = readdir(dfd)) {
341 if (stat(dp->d_name, &statb) < 0 ||
342 (statb.st_mode & S_IFMT) != S_IFREG)
343 continue;
344 if (i == C_MAXFILE)
345 syslog(LOG_ERR,
346 "GetBootFiles: too many boot files (%s ignored)",
347 dp->d_name);
348 else if ((BootFiles[i] = NewStr(dp->d_name)) != NULL)
349 i++;
350 }
351
352 (void) closedir(dfd); /* close BootDir */
353
354 if (i == 0) /* can't find any boot files */
355 syslog(LOG_ERR, "GetBootFiles: no boot files (%s)\n", BootDir);
356
357 return(i);
358 }
359