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 * $FreeBSD: src/lib/libc/gen/getttyent.c,v 1.13 2005/07/25 17:57:15 mdodd Exp $ 34 * $DragonFly: src/lib/libc/gen/getttyent.c,v 1.5 2005/11/13 00:07:42 swildner Exp $ 35 * 36 * @(#)getttyent.c 8.1 (Berkeley) 6/4/93 37 */ 38 39 #include <ttyent.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <ctype.h> 43 #include <string.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 struct ttyent * 71 getttyent(void) 72 { 73 static struct ttyent tty; 74 char *p; 75 int c; 76 size_t i; 77 78 if (!tf && !setttyent()) 79 return (NULL); 80 for (;;) { 81 if (!fgets(p = line, lbsize, tf)) 82 return (NULL); 83 /* extend buffer if line was too big, and retry */ 84 while (!index(p, '\n') && !feof(tf)) { 85 i = strlen(p); 86 lbsize += MALLOCCHUNK; 87 if ((p = realloc(line, lbsize)) == NULL) { 88 endttyent(); 89 return (NULL); 90 } 91 line = p; 92 if (!fgets(&line[i], lbsize - i, tf)) 93 return (NULL); 94 } 95 while (isspace((unsigned char)*p)) 96 ++p; 97 if (*p && *p != '#') 98 break; 99 } 100 101 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) 102 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 103 104 zapchar = 0; 105 tty.ty_name = p; 106 tty.ty_status = 0; 107 tty.ty_window = NULL; 108 tty.ty_group = _TTYS_NOGROUP; 109 110 p = skip(p); 111 if (!*(tty.ty_getty = p)) 112 tty.ty_getty = tty.ty_type = NULL; 113 else { 114 p = skip(p); 115 if (!*(tty.ty_type = p)) 116 tty.ty_type = NULL; 117 else { 118 /* compatibility kludge: handle network/dialup specially */ 119 if (scmp(_TTYS_DIALUP)) 120 tty.ty_status |= TTY_DIALUP; 121 else if (scmp(_TTYS_NETWORK)) 122 tty.ty_status |= TTY_NETWORK; 123 p = skip(p); 124 } 125 } 126 127 for (; *p; p = skip(p)) { 128 if (scmp(_TTYS_OFF)) 129 tty.ty_status &= ~TTY_ON; 130 else if (scmp(_TTYS_ON)) 131 tty.ty_status |= TTY_ON; 132 else if (scmp(_TTYS_SECURE)) 133 tty.ty_status |= TTY_SECURE; 134 else if (scmp(_TTYS_INSECURE)) 135 tty.ty_status &= ~TTY_SECURE; 136 else if (scmp(_TTYS_DIALUP)) 137 tty.ty_status |= TTY_DIALUP; 138 else if (scmp(_TTYS_NETWORK)) 139 tty.ty_status |= TTY_NETWORK; 140 else if (vcmp(_TTYS_WINDOW)) 141 tty.ty_window = value(p); 142 else if (vcmp(_TTYS_GROUP)) 143 tty.ty_group = value(p); 144 else 145 break; 146 } 147 148 if (zapchar == '#' || *p == '#') 149 while ((c = *++p) == ' ' || c == '\t') 150 ; 151 tty.ty_comment = p; 152 if (*p == 0) 153 tty.ty_comment = 0; 154 if ( (p = index(p, '\n')) ) 155 *p = '\0'; 156 return (&tty); 157 } 158 159 #define QUOTED 1 160 161 /* 162 * Skip over the current field, removing quotes, and return a pointer to 163 * the next field. 164 */ 165 static char * 166 skip(char *p) 167 { 168 char *t; 169 int c, q; 170 171 for (q = 0, t = p; (c = *p) != '\0'; p++) { 172 if (c == '"') { 173 q ^= QUOTED; /* obscure, but nice */ 174 continue; 175 } 176 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 177 p++; 178 *t++ = *p; 179 if (q == QUOTED) 180 continue; 181 if (c == '#') { 182 zapchar = c; 183 *p = 0; 184 break; 185 } 186 if (c == '\t' || c == ' ' || c == '\n') { 187 zapchar = c; 188 *p++ = 0; 189 while ((c = *p) == '\t' || c == ' ' || c == '\n') 190 p++; 191 break; 192 } 193 } 194 *--t = '\0'; 195 return (p); 196 } 197 198 static char * 199 value(char *p) 200 { 201 202 return ((p = index(p, '=')) ? ++p : NULL); 203 } 204 205 int 206 setttyent(void) 207 { 208 209 if (line == NULL) { 210 if ((line = malloc(MALLOCCHUNK)) == NULL) 211 return (0); 212 lbsize = MALLOCCHUNK; 213 } 214 if (tf) { 215 rewind(tf); 216 return (1); 217 } else if ( (tf = fopen(_PATH_TTYS, "r")) ) 218 return (1); 219 return (0); 220 } 221 222 int 223 endttyent(void) 224 { 225 int rval; 226 227 /* 228 * NB: Don't free `line' because getttynam() 229 * may still be referencing it 230 */ 231 if (tf) { 232 rval = (fclose(tf) != EOF); 233 tf = NULL; 234 return (rval); 235 } 236 return (1); 237 } 238 239 static int 240 isttystat(const char *tty, int flag) 241 { 242 struct ttyent *t; 243 244 return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 245 } 246 247 248 int 249 isdialuptty(const char *tty) 250 { 251 252 return isttystat(tty, TTY_DIALUP); 253 } 254 255 int 256 isnettty(const char *tty) 257 { 258 259 return isttystat(tty, TTY_NETWORK); 260 } 261