1 /* $NetBSD: parseconf.c,v 1.7 1997/10/19 19:43:45 mycroft Exp $ */ 2 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 css-dist@cs.utah.edu 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. All advertising materials mentioning features or use of this software 24 * must display the following acknowledgement: 25 * This product includes software developed by the University of 26 * California, Berkeley and its contributors. 27 * 4. Neither the name of the University nor the names of its contributors 28 * may be used to endorse or promote products derived from this software 29 * without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 41 * SUCH DAMAGE. 42 * 43 * from: @(#)parseconf.c 8.1 (Berkeley) 6/4/93 44 * 45 * From: Utah Hdr: parseconf.c 3.1 92/07/06 46 * Author: Jeff Forys, University of Utah CSS 47 */ 48 49 #include <sys/cdefs.h> 50 #ifndef lint 51 #if 0 52 static char sccsid[] = "@(#)parseconf.c 8.1 (Berkeley) 6/4/93"; 53 #else 54 __RCSID("$NetBSD: parseconf.c,v 1.7 1997/10/19 19:43:45 mycroft Exp $"); 55 #endif 56 #endif /* not lint */ 57 58 #include <sys/param.h> 59 #include <sys/stat.h> 60 61 #include <ctype.h> 62 #include <dirent.h> 63 #include <fcntl.h> 64 #include <signal.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <syslog.h> 69 #include "defs.h" 70 71 /* 72 ** ParseConfig -- parse the config file into linked list of clients. 73 ** 74 ** Parameters: 75 ** None. 76 ** 77 ** Returns: 78 ** 1 on success, 0 otherwise. 79 ** 80 ** Side Effects: 81 ** - Linked list of clients will be (re)allocated. 82 ** 83 ** Warnings: 84 ** - GetBootFiles() must be called before this routine 85 ** to create a linked list of default boot files. 86 */ 87 int 88 ParseConfig() 89 { 90 FILE *fp; 91 CLIENT *client; 92 u_int8_t *addr; 93 char line[C_LINELEN]; 94 char *cp, *bcp; 95 int i, j; 96 int omask, linecnt = 0; 97 98 if (BootAny) /* ignore config file */ 99 return(1); 100 101 FreeClients(); /* delete old list of clients */ 102 103 if ((fp = fopen(ConfigFile, "r")) == NULL) { 104 syslog(LOG_ERR, "ParseConfig: can't open config file (%s)", 105 ConfigFile); 106 return(0); 107 } 108 109 /* 110 * We've got to block SIGHUP to prevent reconfiguration while 111 * dealing with the linked list of Clients. This can be done 112 * when actually linking the new client into the list, but 113 * this could have unexpected results if the server was HUP'd 114 * whilst reconfiguring. Hence, it is done here. 115 */ 116 omask = sigblock(sigmask(SIGHUP)); 117 118 /* 119 * GETSTR positions `bcp' at the start of the current token, 120 * and null terminates it. `cp' is positioned at the start 121 * of the next token. spaces & commas are separators. 122 */ 123 #define GETSTR while (isspace(*cp) || *cp == ',') cp++; \ 124 bcp = cp; \ 125 while (*cp && *cp!=',' && !isspace(*cp)) cp++; \ 126 if (*cp) *cp++ = '\0' 127 128 /* 129 * For each line, parse it into a new CLIENT struct. 130 */ 131 while (fgets(line, C_LINELEN, fp) != NULL) { 132 linecnt++; /* line counter */ 133 134 if (*line == '\0' || *line == '#') /* ignore comment */ 135 continue; 136 137 if ((cp = strchr(line,'#')) != NULL) /* trash comments */ 138 *cp = '\0'; 139 140 cp = line; /* init `cp' */ 141 GETSTR; /* get RMP addr */ 142 if (bcp == cp) /* all delimiters */ 143 continue; 144 145 /* 146 * Get an RMP address from a string. Abort on failure. 147 */ 148 if ((addr = ParseAddr(bcp)) == NULL) { 149 syslog(LOG_ERR, 150 "ParseConfig: line %d: cant parse <%s>", 151 linecnt, bcp); 152 continue; 153 } 154 155 if ((client = NewClient(addr)) == NULL) /* alloc new client */ 156 continue; 157 158 GETSTR; /* get first file */ 159 160 /* 161 * If no boot files are spec'd, use the default list. 162 * Otherwise, validate each file (`bcp') against the 163 * list of boot-able files. 164 */ 165 i = 0; 166 if (bcp == cp) /* no files spec'd */ 167 for (; i < C_MAXFILE && BootFiles[i] != NULL; i++) 168 client->files[i] = BootFiles[i]; 169 else { 170 do { 171 /* 172 * For each boot file spec'd, make sure it's 173 * in our list. If so, include a pointer to 174 * it in the CLIENT's list of boot files. 175 */ 176 for (j = 0; ; j++) { 177 if (j==C_MAXFILE||BootFiles[j]==NULL) { 178 syslog(LOG_ERR, "ParseConfig: line %d: no boot file (%s)", 179 linecnt, bcp); 180 break; 181 } 182 if (STREQN(BootFiles[j], bcp)) { 183 if (i < C_MAXFILE) 184 client->files[i++] = 185 BootFiles[j]; 186 else 187 syslog(LOG_ERR, "ParseConfig: line %d: too many boot files (%s)", 188 linecnt, bcp); 189 break; 190 } 191 } 192 GETSTR; /* get next file */ 193 } while (bcp != cp); 194 195 /* 196 * Restricted list of boot files were spec'd, 197 * however, none of them were found. Since we 198 * apparently cant let them boot "just anything", 199 * the entire record is invalidated. 200 */ 201 if (i == 0) { 202 FreeClient(client); 203 continue; 204 } 205 } 206 207 /* 208 * Link this client into the linked list of clients. 209 * SIGHUP has already been blocked. 210 */ 211 if (Clients) 212 client->next = Clients; 213 Clients = client; 214 } 215 216 (void) fclose(fp); /* close config file */ 217 218 (void) sigsetmask(omask); /* reset signal mask */ 219 220 return(1); /* return success */ 221 } 222 223 /* 224 ** ParseAddr -- Parse a string containing an RMP address. 225 ** 226 ** This routine is fairly liberal at parsing an RMP address. The 227 ** address must contain 6 octets consisting of between 0 and 2 hex 228 ** chars (upper/lower case) separated by colons. If two colons are 229 ** together (e.g. "::", the octet between them is recorded as being 230 ** zero. Hence, the following addrs are all valid and parse to the 231 ** same thing: 232 ** 233 ** 08:00:09:00:66:ad 8::9:0:66:AD 8::9::66:aD 234 ** 235 ** For clarity, an RMP address is really an Ethernet address, but 236 ** since the HP boot code uses IEEE 802.3, it's really an IEEE 237 ** 802.3 address. Of course, all of these are identical. 238 ** 239 ** Parameters: 240 ** str - string representation of an RMP address. 241 ** 242 ** Returns: 243 ** pointer to a static array of RMP_ADDRLEN bytes. 244 ** 245 ** Side Effects: 246 ** None. 247 ** 248 ** Warnings: 249 ** - The return value points to a static buffer; it must 250 ** be copied if it's to be saved. 251 */ 252 u_int8_t * 253 ParseAddr(str) 254 char *str; 255 { 256 static u_int8_t addr[RMP_ADDRLEN]; 257 char *cp; 258 unsigned i; 259 int part, subpart; 260 261 memset((char *)&addr[0], 0, RMP_ADDRLEN); /* zero static buffer */ 262 263 part = subpart = 0; 264 for (cp = str; *cp; cp++) { 265 /* 266 * A colon (`:') must be used to delimit each octet. 267 */ 268 if (*cp == ':') { 269 if (++part == RMP_ADDRLEN) /* too many parts */ 270 return(NULL); 271 subpart = 0; 272 continue; 273 } 274 275 /* 276 * Convert hex character to an integer. 277 */ 278 if (isdigit(*cp)) 279 i = *cp - '0'; 280 else { 281 i = (isupper(*cp)? tolower(*cp): *cp) - 'a' + 10; 282 if (i < 10 || i > 15) /* not a hex char */ 283 return(NULL); 284 } 285 286 if (subpart++) { 287 if (subpart > 2) /* too many hex chars */ 288 return(NULL); 289 addr[part] <<= 4; 290 } 291 addr[part] |= i; 292 } 293 294 if (part != (RMP_ADDRLEN-1)) /* too few parts */ 295 return(NULL); 296 297 return(&addr[0]); 298 } 299 300 /* 301 ** GetBootFiles -- record list of files in current (boot) directory. 302 ** 303 ** Parameters: 304 ** None. 305 ** 306 ** Returns: 307 ** Number of boot files on success, 0 on failure. 308 ** 309 ** Side Effects: 310 ** Strings in `BootFiles' are freed/allocated. 311 ** 312 ** Warnings: 313 ** - After this routine is called, ParseConfig() must be 314 ** called to re-order it's list of boot file pointers. 315 */ 316 int 317 GetBootFiles() 318 { 319 DIR *dfd; 320 struct stat statb; 321 struct dirent *dp; 322 int i; 323 324 /* 325 * Free the current list of boot files. 326 */ 327 for (i = 0; i < C_MAXFILE && BootFiles[i] != NULL; i++) { 328 FreeStr(BootFiles[i]); 329 BootFiles[i] = NULL; 330 } 331 332 /* 333 * Open current directory to read boot file names. 334 */ 335 if ((dfd = opendir(".")) == NULL) { /* open BootDir */ 336 syslog(LOG_ERR, "GetBootFiles: can't open directory (%s)\n", 337 BootDir); 338 return(0); 339 } 340 341 /* 342 * Read each boot file name and allocate space for it in the 343 * list of boot files (BootFiles). All boot files read after 344 * C_MAXFILE will be ignored. 345 */ 346 i = 0; 347 for (dp = readdir(dfd); dp != NULL; dp = readdir(dfd)) { 348 if (stat(dp->d_name, &statb) < 0 || !S_ISREG(statb.st_mode)) 349 continue; 350 if (i == C_MAXFILE) 351 syslog(LOG_ERR, 352 "GetBootFiles: too many boot files (%s ignored)", 353 dp->d_name); 354 else if ((BootFiles[i] = NewStr(dp->d_name)) != NULL) 355 i++; 356 } 357 358 (void) closedir(dfd); /* close BootDir */ 359 360 if (i == 0) /* cant find any boot files */ 361 syslog(LOG_ERR, "GetBootFiles: no boot files (%s)\n", BootDir); 362 363 return(i); 364 } 365