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 #if defined(LIBC_SCCS) && !defined(lint) 33 static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; 34 #endif /* LIBC_SCCS and not lint */ 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/types.h> 39 #include <sys/stat.h> 40 #include <sys/sysctl.h> 41 42 #include <ctype.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <ttyent.h> 47 48 static char zapchar; 49 static FILE *tf; 50 static size_t lbsize; 51 static char *line; 52 53 #define MALLOCCHUNK 100 54 55 static char *skip(char *); 56 static char *value(char *); 57 58 struct ttyent * 59 getttynam(const char *tty) 60 { 61 struct ttyent *t; 62 63 if (strncmp(tty, "/dev/", 5) == 0) 64 tty += 5; 65 setttyent(); 66 while ( (t = getttyent()) ) 67 if (!strcmp(tty, t->ty_name)) 68 break; 69 endttyent(); 70 return (t); 71 } 72 73 static int 74 auto_tty_status(const char *ty_name) 75 { 76 size_t len; 77 char *buf, *cons, *nextcons; 78 int rv; 79 80 rv = TTY_IFCONSOLE; 81 82 /* Check if this is an enabled kernel console line */ 83 buf = NULL; 84 if (sysctlbyname("kern.console", NULL, &len, NULL, 0) == -1) 85 return (rv); /* Errors mean don't enable */ 86 buf = malloc(len); 87 if (sysctlbyname("kern.console", buf, &len, NULL, 0) == -1) 88 goto done; 89 90 if ((cons = strchr(buf, '/')) == NULL) 91 goto done; 92 *cons = '\0'; 93 nextcons = buf; 94 while ((cons = strsep(&nextcons, ",")) != NULL && strlen(cons) != 0) { 95 if (strcmp(cons, ty_name) == 0) { 96 rv |= TTY_ON; 97 break; 98 } 99 } 100 101 done: 102 free(buf); 103 return (rv); 104 } 105 106 static int 107 auto_exists_status(const char *ty_name) 108 { 109 struct stat sb; 110 char *dev; 111 int rv; 112 113 rv = TTY_IFEXISTS; 114 if (*ty_name == '/') 115 asprintf(&dev, "%s", ty_name); 116 else 117 asprintf(&dev, "/dev/%s", ty_name); 118 if (dev != NULL && stat(dev, &sb) == 0) 119 rv |= TTY_ON; 120 free(dev); 121 return (rv); 122 } 123 124 struct ttyent * 125 getttyent(void) 126 { 127 static struct ttyent tty; 128 char *p; 129 int c; 130 size_t i; 131 132 if (!tf && !setttyent()) 133 return (NULL); 134 for (;;) { 135 if (!fgets(p = line, lbsize, tf)) 136 return (NULL); 137 /* extend buffer if line was too big, and retry */ 138 while (!strchr(p, '\n') && !feof(tf)) { 139 i = strlen(p); 140 lbsize += MALLOCCHUNK; 141 if ((p = realloc(line, lbsize)) == NULL) { 142 (void)endttyent(); 143 return (NULL); 144 } 145 line = p; 146 if (!fgets(&line[i], lbsize - i, tf)) 147 return (NULL); 148 } 149 while (isspace((unsigned char)*p)) 150 ++p; 151 if (*p && *p != '#') 152 break; 153 } 154 155 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) 156 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 157 158 zapchar = 0; 159 tty.ty_name = p; 160 tty.ty_status = 0; 161 tty.ty_window = NULL; 162 tty.ty_group = _TTYS_NOGROUP; 163 164 p = skip(p); 165 if (!*(tty.ty_getty = p)) 166 tty.ty_getty = tty.ty_type = NULL; 167 else { 168 p = skip(p); 169 if (!*(tty.ty_type = p)) 170 tty.ty_type = NULL; 171 else { 172 /* compatibility kludge: handle network/dialup specially */ 173 if (scmp(_TTYS_DIALUP)) 174 tty.ty_status |= TTY_DIALUP; 175 else if (scmp(_TTYS_NETWORK)) 176 tty.ty_status |= TTY_NETWORK; 177 p = skip(p); 178 } 179 } 180 181 for (; *p; p = skip(p)) { 182 if (scmp(_TTYS_OFF)) 183 tty.ty_status &= ~TTY_ON; 184 else if (scmp(_TTYS_ON)) 185 tty.ty_status |= TTY_ON; 186 else if (scmp(_TTYS_ONIFCONSOLE)) 187 tty.ty_status |= auto_tty_status(tty.ty_name); 188 else if (scmp(_TTYS_ONIFEXISTS)) 189 tty.ty_status |= auto_exists_status(tty.ty_name); 190 else if (scmp(_TTYS_SECURE)) 191 tty.ty_status |= TTY_SECURE; 192 else if (scmp(_TTYS_INSECURE)) 193 tty.ty_status &= ~TTY_SECURE; 194 else if (scmp(_TTYS_DIALUP)) 195 tty.ty_status |= TTY_DIALUP; 196 else if (scmp(_TTYS_NETWORK)) 197 tty.ty_status |= TTY_NETWORK; 198 else if (vcmp(_TTYS_WINDOW)) 199 tty.ty_window = value(p); 200 else if (vcmp(_TTYS_GROUP)) 201 tty.ty_group = value(p); 202 else 203 break; 204 } 205 206 if (zapchar == '#' || *p == '#') 207 while ((c = *++p) == ' ' || c == '\t') 208 ; 209 tty.ty_comment = p; 210 if (*p == 0) 211 tty.ty_comment = 0; 212 if ((p = strchr(p, '\n'))) 213 *p = '\0'; 214 return (&tty); 215 } 216 217 #define QUOTED 1 218 219 /* 220 * Skip over the current field, removing quotes, and return a pointer to 221 * the next field. 222 */ 223 static char * 224 skip(char *p) 225 { 226 char *t; 227 int c, q; 228 229 for (q = 0, t = p; (c = *p) != '\0'; p++) { 230 if (c == '"') { 231 q ^= QUOTED; /* obscure, but nice */ 232 continue; 233 } 234 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 235 p++; 236 *t++ = *p; 237 if (q == QUOTED) 238 continue; 239 if (c == '#') { 240 zapchar = c; 241 *p = 0; 242 break; 243 } 244 if (c == '\t' || c == ' ' || c == '\n') { 245 zapchar = c; 246 *p++ = 0; 247 while ((c = *p) == '\t' || c == ' ' || c == '\n') 248 p++; 249 break; 250 } 251 } 252 *--t = '\0'; 253 return (p); 254 } 255 256 static char * 257 value(char *p) 258 { 259 260 return ((p = strchr(p, '=')) ? ++p : NULL); 261 } 262 263 int 264 setttyent(void) 265 { 266 267 if (line == NULL) { 268 if ((line = malloc(MALLOCCHUNK)) == NULL) 269 return (0); 270 lbsize = MALLOCCHUNK; 271 } 272 if (tf) { 273 rewind(tf); 274 return (1); 275 } else if ( (tf = fopen(_PATH_TTYS, "re")) ) 276 return (1); 277 return (0); 278 } 279 280 int 281 endttyent(void) 282 { 283 int rval; 284 285 /* 286 * NB: Don't free `line' because getttynam() 287 * may still be referencing it 288 */ 289 if (tf) { 290 rval = (fclose(tf) != EOF); 291 tf = NULL; 292 return (rval); 293 } 294 return (1); 295 } 296 297 static int 298 isttystat(const char *tty, int flag) 299 { 300 struct ttyent *t; 301 302 return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 303 } 304 305 306 int 307 isdialuptty(const char *tty) 308 { 309 310 return isttystat(tty, TTY_DIALUP); 311 } 312 313 int 314 isnettty(const char *tty) 315 { 316 317 return isttystat(tty, TTY_NETWORK); 318 } 319