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