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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; 36 #endif /* LIBC_SCCS and not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <ttyent.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <ctype.h> 44 #include <string.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(tty) 58 const char *tty; 59 { 60 struct ttyent *t; 61 62 if (strncmp(tty, "/dev/", 5) == 0) 63 tty += 5; 64 setttyent(); 65 while ( (t = getttyent()) ) 66 if (!strcmp(tty, t->ty_name)) 67 break; 68 endttyent(); 69 return (t); 70 } 71 72 struct ttyent * 73 getttyent() 74 { 75 static struct ttyent tty; 76 char *p; 77 int c; 78 size_t i; 79 80 if (!tf && !setttyent()) 81 return (NULL); 82 for (;;) { 83 if (!fgets(p = line, lbsize, tf)) 84 return (NULL); 85 /* extend buffer if line was too big, and retry */ 86 while (!index(p, '\n')) { 87 i = strlen(p); 88 lbsize += MALLOCCHUNK; 89 if ((p = realloc(line, lbsize)) == NULL) { 90 (void)endttyent(); 91 return (NULL); 92 } 93 line = p; 94 if (!fgets(&line[i], lbsize - i, tf)) 95 return (NULL); 96 } 97 while (isspace((unsigned char)*p)) 98 ++p; 99 if (*p && *p != '#') 100 break; 101 } 102 103 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) 104 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 105 106 zapchar = 0; 107 tty.ty_name = p; 108 tty.ty_status = 0; 109 tty.ty_window = NULL; 110 tty.ty_group = _TTYS_NOGROUP; 111 112 p = skip(p); 113 if (!*(tty.ty_getty = p)) 114 tty.ty_getty = tty.ty_type = NULL; 115 else { 116 p = skip(p); 117 if (!*(tty.ty_type = p)) 118 tty.ty_type = NULL; 119 else { 120 /* compatibility kludge: handle network/dialup specially */ 121 if (scmp(_TTYS_DIALUP)) 122 tty.ty_status |= TTY_DIALUP; 123 else if (scmp(_TTYS_NETWORK)) 124 tty.ty_status |= TTY_NETWORK; 125 p = skip(p); 126 } 127 } 128 129 for (; *p; p = skip(p)) { 130 if (scmp(_TTYS_OFF)) 131 tty.ty_status &= ~TTY_ON; 132 else if (scmp(_TTYS_ON)) 133 tty.ty_status |= TTY_ON; 134 else if (scmp(_TTYS_SECURE)) 135 tty.ty_status |= TTY_SECURE; 136 else if (scmp(_TTYS_INSECURE)) 137 tty.ty_status &= ~TTY_SECURE; 138 else if (scmp(_TTYS_DIALUP)) 139 tty.ty_status |= TTY_DIALUP; 140 else if (scmp(_TTYS_NETWORK)) 141 tty.ty_status |= TTY_NETWORK; 142 else if (vcmp(_TTYS_WINDOW)) 143 tty.ty_window = value(p); 144 else if (vcmp(_TTYS_GROUP)) 145 tty.ty_group = value(p); 146 else 147 break; 148 } 149 150 if (zapchar == '#' || *p == '#') 151 while ((c = *++p) == ' ' || c == '\t') 152 ; 153 tty.ty_comment = p; 154 if (*p == 0) 155 tty.ty_comment = 0; 156 if ( (p = index(p, '\n')) ) 157 *p = '\0'; 158 return (&tty); 159 } 160 161 #define QUOTED 1 162 163 /* 164 * Skip over the current field, removing quotes, and return a pointer to 165 * the next field. 166 */ 167 static char * 168 skip(p) 169 char *p; 170 { 171 char *t; 172 int c, q; 173 174 for (q = 0, t = p; (c = *p) != '\0'; p++) { 175 if (c == '"') { 176 q ^= QUOTED; /* obscure, but nice */ 177 continue; 178 } 179 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 180 p++; 181 *t++ = *p; 182 if (q == QUOTED) 183 continue; 184 if (c == '#') { 185 zapchar = c; 186 *p = 0; 187 break; 188 } 189 if (c == '\t' || c == ' ' || c == '\n') { 190 zapchar = c; 191 *p++ = 0; 192 while ((c = *p) == '\t' || c == ' ' || c == '\n') 193 p++; 194 break; 195 } 196 } 197 *--t = '\0'; 198 return (p); 199 } 200 201 static char * 202 value(p) 203 char *p; 204 { 205 206 return ((p = index(p, '=')) ? ++p : NULL); 207 } 208 209 int 210 setttyent() 211 { 212 213 if (line == NULL) { 214 if ((line = malloc(MALLOCCHUNK)) == NULL) 215 return (0); 216 lbsize = MALLOCCHUNK; 217 } 218 if (tf) { 219 rewind(tf); 220 return (1); 221 } else if ( (tf = fopen(_PATH_TTYS, "r")) ) 222 return (1); 223 return (0); 224 } 225 226 int 227 endttyent() 228 { 229 int rval; 230 231 /* 232 * NB: Don't free `line' because getttynam() 233 * may still be referencing it 234 */ 235 if (tf) { 236 rval = (fclose(tf) != EOF); 237 tf = NULL; 238 return (rval); 239 } 240 return (1); 241 } 242 243 static int 244 isttystat(tty, flag) 245 const char *tty; 246 int flag; 247 { 248 struct ttyent *t; 249 250 return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 251 } 252 253 254 int 255 isdialuptty(tty) 256 const char *tty; 257 { 258 259 return isttystat(tty, TTY_DIALUP); 260 } 261 262 int isnettty(tty) 263 const char *tty; 264 { 265 266 return isttystat(tty, TTY_NETWORK); 267 } 268