1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __SCCSID("@(#)getttyent.c 8.1 (Berkeley) 6/4/93"); 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 int rv; 77 78 rv = TTY_IFCONSOLE; 79 80 /* Check if this is an enabled kernel console line */ 81 buf = NULL; 82 if (sysctlbyname("kern.console", NULL, &len, NULL, 0) == -1) 83 return (rv); /* Errors mean don't enable */ 84 buf = malloc(len); 85 if (sysctlbyname("kern.console", buf, &len, NULL, 0) == -1) 86 goto done; 87 88 if ((cons = strchr(buf, '/')) == NULL) 89 goto done; 90 *cons = '\0'; 91 nextcons = buf; 92 while ((cons = strsep(&nextcons, ",")) != NULL && strlen(cons) != 0) { 93 if (strcmp(cons, ty_name) == 0) { 94 rv |= TTY_ON; 95 break; 96 } 97 } 98 99 done: 100 free(buf); 101 return (rv); 102 } 103 104 static int 105 auto_exists_status(const char *ty_name) 106 { 107 struct stat sb; 108 char *dev; 109 int rv; 110 111 rv = TTY_IFEXISTS; 112 if (*ty_name == '/') 113 asprintf(&dev, "%s", ty_name); 114 else 115 asprintf(&dev, "/dev/%s", ty_name); 116 if (dev != NULL && stat(dev, &sb) == 0) 117 rv |= TTY_ON; 118 free(dev); 119 return (rv); 120 } 121 122 struct ttyent * 123 getttyent(void) 124 { 125 static struct ttyent tty; 126 char *p; 127 int c; 128 size_t i; 129 130 if (!tf && !setttyent()) 131 return (NULL); 132 for (;;) { 133 if (!fgets(p = line, lbsize, tf)) 134 return (NULL); 135 /* extend buffer if line was too big, and retry */ 136 while (!strchr(p, '\n') && !feof(tf)) { 137 i = strlen(p); 138 lbsize += MALLOCCHUNK; 139 if ((p = realloc(line, lbsize)) == NULL) { 140 (void)endttyent(); 141 return (NULL); 142 } 143 line = p; 144 if (!fgets(&line[i], lbsize - i, tf)) 145 return (NULL); 146 } 147 while (isspace((unsigned char)*p)) 148 ++p; 149 if (*p && *p != '#') 150 break; 151 } 152 153 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) 154 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 155 156 zapchar = 0; 157 tty.ty_name = p; 158 tty.ty_status = 0; 159 tty.ty_window = NULL; 160 tty.ty_group = _TTYS_NOGROUP; 161 162 p = skip(p); 163 if (!*(tty.ty_getty = p)) 164 tty.ty_getty = tty.ty_type = NULL; 165 else { 166 p = skip(p); 167 if (!*(tty.ty_type = p)) 168 tty.ty_type = NULL; 169 else { 170 /* compatibility kludge: handle network/dialup specially */ 171 if (scmp(_TTYS_DIALUP)) 172 tty.ty_status |= TTY_DIALUP; 173 else if (scmp(_TTYS_NETWORK)) 174 tty.ty_status |= TTY_NETWORK; 175 p = skip(p); 176 } 177 } 178 179 for (; *p; p = skip(p)) { 180 if (scmp(_TTYS_OFF)) 181 tty.ty_status &= ~TTY_ON; 182 else if (scmp(_TTYS_ON)) 183 tty.ty_status |= TTY_ON; 184 else if (scmp(_TTYS_ONIFCONSOLE)) 185 tty.ty_status |= auto_tty_status(tty.ty_name); 186 else if (scmp(_TTYS_ONIFEXISTS)) 187 tty.ty_status |= auto_exists_status(tty.ty_name); 188 else if (scmp(_TTYS_SECURE)) 189 tty.ty_status |= TTY_SECURE; 190 else if (scmp(_TTYS_INSECURE)) 191 tty.ty_status &= ~TTY_SECURE; 192 else if (scmp(_TTYS_DIALUP)) 193 tty.ty_status |= TTY_DIALUP; 194 else if (scmp(_TTYS_NETWORK)) 195 tty.ty_status |= TTY_NETWORK; 196 else if (vcmp(_TTYS_WINDOW)) 197 tty.ty_window = value(p); 198 else if (vcmp(_TTYS_GROUP)) 199 tty.ty_group = value(p); 200 else 201 break; 202 } 203 204 if (zapchar == '#' || *p == '#') 205 while ((c = *++p) == ' ' || c == '\t') 206 ; 207 tty.ty_comment = p; 208 if (*p == 0) 209 tty.ty_comment = 0; 210 if ((p = strchr(p, '\n'))) 211 *p = '\0'; 212 return (&tty); 213 } 214 215 #define QUOTED 1 216 217 /* 218 * Skip over the current field, removing quotes, and return a pointer to 219 * the next field. 220 */ 221 static char * 222 skip(char *p) 223 { 224 char *t; 225 int c, q; 226 227 for (q = 0, t = p; (c = *p) != '\0'; p++) { 228 if (c == '"') { 229 q ^= QUOTED; /* obscure, but nice */ 230 continue; 231 } 232 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 233 p++; 234 *t++ = *p; 235 if (q == QUOTED) 236 continue; 237 if (c == '#') { 238 zapchar = c; 239 *p = 0; 240 break; 241 } 242 if (c == '\t' || c == ' ' || c == '\n') { 243 zapchar = c; 244 *p++ = 0; 245 while ((c = *p) == '\t' || c == ' ' || c == '\n') 246 p++; 247 break; 248 } 249 } 250 *--t = '\0'; 251 return (p); 252 } 253 254 static char * 255 value(char *p) 256 { 257 258 return ((p = strchr(p, '=')) ? ++p : NULL); 259 } 260 261 int 262 setttyent(void) 263 { 264 265 if (line == NULL) { 266 if ((line = malloc(MALLOCCHUNK)) == NULL) 267 return (0); 268 lbsize = MALLOCCHUNK; 269 } 270 if (tf) { 271 rewind(tf); 272 return (1); 273 } else if ( (tf = fopen(_PATH_TTYS, "re")) ) 274 return (1); 275 return (0); 276 } 277 278 int 279 endttyent(void) 280 { 281 int rval; 282 283 /* 284 * NB: Don't free `line' because getttynam() 285 * may still be referencing it 286 */ 287 if (tf) { 288 rval = (fclose(tf) != EOF); 289 tf = NULL; 290 return (rval); 291 } 292 return (1); 293 } 294 295 static int 296 isttystat(const char *tty, int flag) 297 { 298 struct ttyent *t; 299 300 return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 301 } 302 303 304 int 305 isdialuptty(const char *tty) 306 { 307 308 return isttystat(tty, TTY_DIALUP); 309 } 310 311 int 312 isnettty(const char *tty) 313 { 314 315 return isttystat(tty, TTY_NETWORK); 316 } 317