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 <sys/cdefs.h> 40 41 #include <ttyent.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <ctype.h> 45 #include <string.h> 46 #include <dirent.h> 47 #include <paths.h> 48 49 static char zapchar; 50 static FILE *tf; 51 static int maxpts = -1; 52 static int curpts = 0; 53 static size_t lbsize; 54 static char *line; 55 56 #define PTS "pts/" 57 #define MALLOCCHUNK 100 58 59 static char *skip (char *); 60 static char *value (char *); 61 62 struct ttyent * 63 getttynam(const char *tty) 64 { 65 struct ttyent *t; 66 67 if (strncmp(tty, "/dev/", 5) == 0) 68 tty += 5; 69 setttyent(); 70 while ( (t = getttyent()) ) 71 if (!strcmp(tty, t->ty_name)) 72 break; 73 endttyent(); 74 return (t); 75 } 76 77 struct ttyent * 78 getttyent(void) 79 { 80 static struct ttyent tty; 81 static char devpts_name[] = "pts/9999999999"; 82 char *p; 83 int c; 84 size_t i; 85 86 if (!tf && !setttyent()) 87 return (NULL); 88 for (;;) { 89 if (!fgets(p = line, lbsize, tf)) { 90 if (curpts <= maxpts) { 91 sprintf(devpts_name, "pts/%d", curpts++); 92 tty.ty_name = devpts_name; 93 tty.ty_getty = NULL; 94 tty.ty_type = NULL; 95 tty.ty_status = TTY_NETWORK; 96 tty.ty_window = NULL; 97 tty.ty_comment = NULL; 98 tty.ty_group = _TTYS_NOGROUP; 99 return (&tty); 100 } 101 return (NULL); 102 } 103 /* extend buffer if line was too big, and retry */ 104 while (!index(p, '\n') && !feof(tf)) { 105 i = strlen(p); 106 lbsize += MALLOCCHUNK; 107 if ((p = realloc(line, lbsize)) == NULL) { 108 endttyent(); 109 return (NULL); 110 } 111 line = p; 112 if (!fgets(&line[i], lbsize - i, tf)) 113 return (NULL); 114 } 115 while (isspace((unsigned char)*p)) 116 ++p; 117 if (*p && *p != '#') 118 break; 119 } 120 121 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) 122 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 123 124 zapchar = 0; 125 tty.ty_name = p; 126 tty.ty_status = 0; 127 tty.ty_window = NULL; 128 tty.ty_group = _TTYS_NOGROUP; 129 130 p = skip(p); 131 if (!*(tty.ty_getty = p)) 132 tty.ty_getty = tty.ty_type = NULL; 133 else { 134 p = skip(p); 135 if (!*(tty.ty_type = p)) 136 tty.ty_type = NULL; 137 else { 138 /* compatibility kludge: handle network/dialup specially */ 139 if (scmp(_TTYS_DIALUP)) 140 tty.ty_status |= TTY_DIALUP; 141 else if (scmp(_TTYS_NETWORK)) 142 tty.ty_status |= TTY_NETWORK; 143 p = skip(p); 144 } 145 } 146 147 for (; *p; p = skip(p)) { 148 if (scmp(_TTYS_OFF)) 149 tty.ty_status &= ~TTY_ON; 150 else if (scmp(_TTYS_ON)) 151 tty.ty_status |= TTY_ON; 152 else if (scmp(_TTYS_SECURE)) 153 tty.ty_status |= TTY_SECURE; 154 else if (scmp(_TTYS_INSECURE)) 155 tty.ty_status &= ~TTY_SECURE; 156 else if (scmp(_TTYS_DIALUP)) 157 tty.ty_status |= TTY_DIALUP; 158 else if (scmp(_TTYS_NETWORK)) 159 tty.ty_status |= TTY_NETWORK; 160 else if (vcmp(_TTYS_WINDOW)) 161 tty.ty_window = value(p); 162 else if (vcmp(_TTYS_GROUP)) 163 tty.ty_group = value(p); 164 else 165 break; 166 } 167 168 if (zapchar == '#' || *p == '#') 169 while ((c = *++p) == ' ' || c == '\t') 170 ; 171 tty.ty_comment = p; 172 if (*p == 0) 173 tty.ty_comment = 0; 174 if ( (p = index(p, '\n')) ) 175 *p = '\0'; 176 return (&tty); 177 } 178 179 #define QUOTED 1 180 181 /* 182 * Skip over the current field, removing quotes, and return a pointer to 183 * the next field. 184 */ 185 static char * 186 skip(char *p) 187 { 188 char *t; 189 int c, q; 190 191 for (q = 0, t = p; (c = *p) != '\0'; p++) { 192 if (c == '"') { 193 q ^= QUOTED; /* obscure, but nice */ 194 continue; 195 } 196 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 197 p++; 198 *t++ = *p; 199 if (q == QUOTED) 200 continue; 201 if (c == '#') { 202 zapchar = c; 203 *p = 0; 204 break; 205 } 206 if (c == '\t' || c == ' ' || c == '\n') { 207 zapchar = c; 208 *p++ = 0; 209 while ((c = *p) == '\t' || c == ' ' || c == '\n') 210 p++; 211 break; 212 } 213 } 214 *--t = '\0'; 215 return (p); 216 } 217 218 static char * 219 value(char *p) 220 { 221 222 return ((p = index(p, '=')) ? ++p : NULL); 223 } 224 225 int 226 setttyent(void) 227 { 228 DIR *devpts_dir; 229 struct dirent *dp; 230 int unit; 231 232 if (line == NULL) { 233 if ((line = malloc(MALLOCCHUNK)) == NULL) 234 return (0); 235 lbsize = MALLOCCHUNK; 236 } 237 devpts_dir = opendir(_PATH_DEV PTS); 238 if (devpts_dir) { 239 maxpts = -1; 240 while ((dp = readdir(devpts_dir))) { 241 if (strcmp(dp->d_name, ".") == 0 || 242 strcmp(dp->d_name, "..") == 0) 243 continue; 244 245 unit = (int)strtol(dp->d_name, NULL, 10); 246 247 if (unit > maxpts) { 248 maxpts = unit; 249 curpts = 0; 250 } 251 } 252 closedir(devpts_dir); 253 } 254 if (tf) { 255 rewind(tf); 256 return (1); 257 } else if ( (tf = fopen(_PATH_TTYS, "r")) ) 258 return (1); 259 return (0); 260 } 261 262 int 263 endttyent(void) 264 { 265 int rval; 266 267 maxpts = -1; 268 /* 269 * NB: Don't free `line' because getttynam() 270 * may still be referencing it 271 */ 272 if (tf) { 273 rval = (fclose(tf) != EOF); 274 tf = NULL; 275 return (rval); 276 } 277 return (1); 278 } 279 280 static int 281 isttystat(const char *tty, int flag) 282 { 283 struct ttyent *t; 284 285 return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 286 } 287 288 289 int 290 isdialuptty(const char *tty) 291 { 292 293 return isttystat(tty, TTY_DIALUP); 294 } 295 296 int 297 isnettty(const char *tty) 298 { 299 300 return isttystat(tty, TTY_NETWORK); 301 } 302