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