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 1.11 1999/11/04 04:16:27 ache 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')) { 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 p = skip(p); 107 if (!*(tty.ty_getty = p)) 108 tty.ty_getty = tty.ty_type = NULL; 109 else { 110 p = skip(p); 111 if (!*(tty.ty_type = p)) 112 tty.ty_type = NULL; 113 else { 114 /* compatibility kludge: handle network/dialup specially */ 115 if (scmp(_TTYS_DIALUP)) 116 tty.ty_status |= TTY_DIALUP; 117 else if (scmp(_TTYS_NETWORK)) 118 tty.ty_status |= TTY_NETWORK; 119 p = skip(p); 120 } 121 } 122 tty.ty_status = 0; 123 tty.ty_window = NULL; 124 tty.ty_group = _TTYS_NOGROUP; 125 126 for (; *p; p = skip(p)) { 127 if (scmp(_TTYS_OFF)) 128 tty.ty_status &= ~TTY_ON; 129 else if (scmp(_TTYS_ON)) 130 tty.ty_status |= TTY_ON; 131 else if (scmp(_TTYS_SECURE)) 132 tty.ty_status |= TTY_SECURE; 133 else if (scmp(_TTYS_INSECURE)) 134 tty.ty_status &= ~TTY_SECURE; 135 else if (scmp(_TTYS_DIALUP)) 136 tty.ty_status |= TTY_DIALUP; 137 else if (scmp(_TTYS_NETWORK)) 138 tty.ty_status |= TTY_NETWORK; 139 else if (vcmp(_TTYS_WINDOW)) 140 tty.ty_window = value(p); 141 else if (vcmp(_TTYS_GROUP)) 142 tty.ty_group = value(p); 143 else 144 break; 145 } 146 147 if (zapchar == '#' || *p == '#') 148 while ((c = *++p) == ' ' || c == '\t') 149 ; 150 tty.ty_comment = p; 151 if (*p == 0) 152 tty.ty_comment = 0; 153 if ( (p = index(p, '\n')) ) 154 *p = '\0'; 155 return (&tty); 156 } 157 158 #define QUOTED 1 159 160 /* 161 * Skip over the current field, removing quotes, and return a pointer to 162 * the next field. 163 */ 164 static char * 165 skip(char *p) 166 { 167 char *t; 168 int c, q; 169 170 for (q = 0, t = p; (c = *p) != '\0'; p++) { 171 if (c == '"') { 172 q ^= QUOTED; /* obscure, but nice */ 173 continue; 174 } 175 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 176 p++; 177 *t++ = *p; 178 if (q == QUOTED) 179 continue; 180 if (c == '#') { 181 zapchar = c; 182 *p = 0; 183 break; 184 } 185 if (c == '\t' || c == ' ' || c == '\n') { 186 zapchar = c; 187 *p++ = 0; 188 while ((c = *p) == '\t' || c == ' ' || c == '\n') 189 p++; 190 break; 191 } 192 } 193 *--t = '\0'; 194 return (p); 195 } 196 197 static char * 198 value(char *p) 199 { 200 201 return ((p = index(p, '=')) ? ++p : NULL); 202 } 203 204 int 205 setttyent(void) 206 { 207 208 if (line == NULL) { 209 if ((line = malloc(MALLOCCHUNK)) == NULL) 210 return (0); 211 lbsize = MALLOCCHUNK; 212 } 213 if (tf) { 214 rewind(tf); 215 return (1); 216 } else if ( (tf = fopen(_PATH_TTYS, "r")) ) 217 return (1); 218 return (0); 219 } 220 221 int 222 endttyent(void) 223 { 224 int rval; 225 226 /* 227 * NB: Don't free `line' because getttynam() 228 * may still be referencing it 229 */ 230 if (tf) { 231 rval = (fclose(tf) != EOF); 232 tf = NULL; 233 return (rval); 234 } 235 return (1); 236 } 237 238 static int 239 isttystat(const char *tty, int flag) 240 { 241 struct ttyent *t; 242 243 return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 244 } 245 246 247 int 248 isdialuptty(const char *tty) 249 { 250 251 return isttystat(tty, TTY_DIALUP); 252 } 253 254 int 255 isnettty(const char *tty) 256 { 257 258 return isttystat(tty, TTY_NETWORK); 259 } 260