1 /* 2 * Copyright (c) 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; 32 #endif /* LIBC_SCCS and not lint */ 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/types.h> 37 #include <sys/stat.h> 38 #include <sys/sysctl.h> 39 40 #include <ctype.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <ttyent.h> 45 46 static char zapchar; 47 static FILE *tf; 48 static size_t lbsize; 49 static char *line; 50 51 #define MALLOCCHUNK 100 52 53 static char *skip(char *); 54 static char *value(char *); 55 56 struct ttyent * 57 getttynam(const char *tty) 58 { 59 struct ttyent *t; 60 61 if (strncmp(tty, "/dev/", 5) == 0) 62 tty += 5; 63 setttyent(); 64 while ( (t = getttyent()) ) 65 if (!strcmp(tty, t->ty_name)) 66 break; 67 endttyent(); 68 return (t); 69 } 70 71 static int 72 auto_tty_status(const char *ty_name) 73 { 74 size_t len; 75 char *buf, *cons, *nextcons; 76 77 /* Check if this is an enabled kernel console line */ 78 buf = NULL; 79 if (sysctlbyname("kern.console", NULL, &len, NULL, 0) == -1) 80 return (0); /* Errors mean don't enable */ 81 buf = malloc(len); 82 if (sysctlbyname("kern.console", buf, &len, NULL, 0) == -1) 83 goto done; 84 85 if ((cons = strchr(buf, '/')) == NULL) 86 goto done; 87 *cons = '\0'; 88 nextcons = buf; 89 while ((cons = strsep(&nextcons, ",")) != NULL && strlen(cons) != 0) { 90 if (strcmp(cons, ty_name) == 0) { 91 free(buf); 92 return (TTY_ON); 93 } 94 } 95 96 done: 97 free(buf); 98 return (0); 99 } 100 101 static int 102 auto_exists_status(const char *ty_name) 103 { 104 struct stat sb; 105 char *dev; 106 int rv; 107 108 rv = 0; 109 if (*ty_name == '/') 110 asprintf(&dev, "%s", ty_name); 111 else 112 asprintf(&dev, "/dev/%s", ty_name); 113 if (dev != NULL && stat(dev, &sb) == 0) 114 rv = TTY_ON; 115 free(dev); 116 return (rv); 117 } 118 119 struct ttyent * 120 getttyent(void) 121 { 122 static struct ttyent tty; 123 char *p; 124 int c; 125 size_t i; 126 127 if (!tf && !setttyent()) 128 return (NULL); 129 for (;;) { 130 if (!fgets(p = line, lbsize, tf)) 131 return (NULL); 132 /* extend buffer if line was too big, and retry */ 133 while (!strchr(p, '\n') && !feof(tf)) { 134 i = strlen(p); 135 lbsize += MALLOCCHUNK; 136 if ((p = realloc(line, lbsize)) == NULL) { 137 (void)endttyent(); 138 return (NULL); 139 } 140 line = p; 141 if (!fgets(&line[i], lbsize - i, tf)) 142 return (NULL); 143 } 144 while (isspace((unsigned char)*p)) 145 ++p; 146 if (*p && *p != '#') 147 break; 148 } 149 150 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) 151 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 152 153 zapchar = 0; 154 tty.ty_name = p; 155 tty.ty_status = 0; 156 tty.ty_window = NULL; 157 tty.ty_group = _TTYS_NOGROUP; 158 159 p = skip(p); 160 if (!*(tty.ty_getty = p)) 161 tty.ty_getty = tty.ty_type = NULL; 162 else { 163 p = skip(p); 164 if (!*(tty.ty_type = p)) 165 tty.ty_type = NULL; 166 else { 167 /* compatibility kludge: handle network/dialup specially */ 168 if (scmp(_TTYS_DIALUP)) 169 tty.ty_status |= TTY_DIALUP; 170 else if (scmp(_TTYS_NETWORK)) 171 tty.ty_status |= TTY_NETWORK; 172 p = skip(p); 173 } 174 } 175 176 for (; *p; p = skip(p)) { 177 if (scmp(_TTYS_OFF)) 178 tty.ty_status &= ~TTY_ON; 179 else if (scmp(_TTYS_ON)) 180 tty.ty_status |= TTY_ON; 181 else if (scmp(_TTYS_ONIFCONSOLE)) 182 tty.ty_status |= auto_tty_status(tty.ty_name); 183 else if (scmp(_TTYS_ONIFEXISTS)) 184 tty.ty_status |= auto_exists_status(tty.ty_name); 185 else if (scmp(_TTYS_SECURE)) 186 tty.ty_status |= TTY_SECURE; 187 else if (scmp(_TTYS_INSECURE)) 188 tty.ty_status &= ~TTY_SECURE; 189 else if (scmp(_TTYS_DIALUP)) 190 tty.ty_status |= TTY_DIALUP; 191 else if (scmp(_TTYS_NETWORK)) 192 tty.ty_status |= TTY_NETWORK; 193 else if (vcmp(_TTYS_WINDOW)) 194 tty.ty_window = value(p); 195 else if (vcmp(_TTYS_GROUP)) 196 tty.ty_group = value(p); 197 else 198 break; 199 } 200 201 if (zapchar == '#' || *p == '#') 202 while ((c = *++p) == ' ' || c == '\t') 203 ; 204 tty.ty_comment = p; 205 if (*p == 0) 206 tty.ty_comment = 0; 207 if ((p = strchr(p, '\n'))) 208 *p = '\0'; 209 return (&tty); 210 } 211 212 #define QUOTED 1 213 214 /* 215 * Skip over the current field, removing quotes, and return a pointer to 216 * the next field. 217 */ 218 static char * 219 skip(char *p) 220 { 221 char *t; 222 int c, q; 223 224 for (q = 0, t = p; (c = *p) != '\0'; p++) { 225 if (c == '"') { 226 q ^= QUOTED; /* obscure, but nice */ 227 continue; 228 } 229 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 230 p++; 231 *t++ = *p; 232 if (q == QUOTED) 233 continue; 234 if (c == '#') { 235 zapchar = c; 236 *p = 0; 237 break; 238 } 239 if (c == '\t' || c == ' ' || c == '\n') { 240 zapchar = c; 241 *p++ = 0; 242 while ((c = *p) == '\t' || c == ' ' || c == '\n') 243 p++; 244 break; 245 } 246 } 247 *--t = '\0'; 248 return (p); 249 } 250 251 static char * 252 value(char *p) 253 { 254 255 return ((p = strchr(p, '=')) ? ++p : NULL); 256 } 257 258 int 259 setttyent(void) 260 { 261 262 if (line == NULL) { 263 if ((line = malloc(MALLOCCHUNK)) == NULL) 264 return (0); 265 lbsize = MALLOCCHUNK; 266 } 267 if (tf) { 268 rewind(tf); 269 return (1); 270 } else if ( (tf = fopen(_PATH_TTYS, "re")) ) 271 return (1); 272 return (0); 273 } 274 275 int 276 endttyent(void) 277 { 278 int rval; 279 280 /* 281 * NB: Don't free `line' because getttynam() 282 * may still be referencing it 283 */ 284 if (tf) { 285 rval = (fclose(tf) != EOF); 286 tf = NULL; 287 return (rval); 288 } 289 return (1); 290 } 291 292 static int 293 isttystat(const char *tty, int flag) 294 { 295 struct ttyent *t; 296 297 return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 298 } 299 300 301 int 302 isdialuptty(const char *tty) 303 { 304 305 return isttystat(tty, TTY_DIALUP); 306 } 307 308 int 309 isnettty(const char *tty) 310 { 311 312 return isttystat(tty, TTY_NETWORK); 313 } 314