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. 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 * $FreeBSD: src/lib/libc/gen/getttyent.c,v 1.13 2005/07/25 17:57:15 mdodd Exp $ 30 * 31 * @(#)getttyent.c 8.1 (Berkeley) 6/4/93 32 */ 33 34 #include <ttyent.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <ctype.h> 38 #include <string.h> 39 #include <dirent.h> 40 #include <paths.h> 41 42 static char zapchar; 43 static FILE *tf; 44 static int maxpts = -1; 45 static int curpts = 0; 46 static size_t lbsize; 47 static char *line; 48 49 #define PTS "pts/" 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 static char devpts_name[] = "pts/9999999999"; 75 char *p; 76 int c; 77 size_t i; 78 79 if (!tf && !setttyent()) 80 return (NULL); 81 for (;;) { 82 if (!fgets(p = line, lbsize, tf)) { 83 if (curpts <= maxpts) { 84 sprintf(devpts_name, "pts/%d", curpts++); 85 tty.ty_name = devpts_name; 86 tty.ty_getty = NULL; 87 tty.ty_type = NULL; 88 tty.ty_status = TTY_NETWORK; 89 tty.ty_window = NULL; 90 tty.ty_comment = NULL; 91 tty.ty_group = _TTYS_NOGROUP; 92 return (&tty); 93 } 94 return (NULL); 95 } 96 /* extend buffer if line was too big, and retry */ 97 while (!index(p, '\n') && !feof(tf)) { 98 i = strlen(p); 99 lbsize += MALLOCCHUNK; 100 if ((p = realloc(line, lbsize)) == NULL) { 101 endttyent(); 102 return (NULL); 103 } 104 line = p; 105 if (!fgets(&line[i], lbsize - i, tf)) 106 return (NULL); 107 } 108 while (isspace((unsigned char)*p)) 109 ++p; 110 if (*p && *p != '#') 111 break; 112 } 113 114 #define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) 115 #define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 116 117 zapchar = 0; 118 tty.ty_name = p; 119 tty.ty_status = 0; 120 tty.ty_window = NULL; 121 tty.ty_group = _TTYS_NOGROUP; 122 123 p = skip(p); 124 if (!*(tty.ty_getty = p)) 125 tty.ty_getty = tty.ty_type = NULL; 126 else { 127 p = skip(p); 128 if (!*(tty.ty_type = p)) 129 tty.ty_type = NULL; 130 else { 131 /* compatibility kludge: handle network/dialup specially */ 132 if (scmp(_TTYS_DIALUP)) 133 tty.ty_status |= TTY_DIALUP; 134 else if (scmp(_TTYS_NETWORK)) 135 tty.ty_status |= TTY_NETWORK; 136 p = skip(p); 137 } 138 } 139 140 for (; *p; p = skip(p)) { 141 if (scmp(_TTYS_OFF)) 142 tty.ty_status &= ~TTY_ON; 143 else if (scmp(_TTYS_ON)) 144 tty.ty_status |= TTY_ON; 145 else if (scmp(_TTYS_SECURE)) 146 tty.ty_status |= TTY_SECURE; 147 else if (scmp(_TTYS_INSECURE)) 148 tty.ty_status &= ~TTY_SECURE; 149 else if (scmp(_TTYS_DIALUP)) 150 tty.ty_status |= TTY_DIALUP; 151 else if (scmp(_TTYS_NETWORK)) 152 tty.ty_status |= TTY_NETWORK; 153 else if (scmp(_TTYS_IFCONSOLE)) 154 tty.ty_status |= TTY_IFCONSOLE; 155 else if (scmp(_TTYS_IFEXISTS)) 156 tty.ty_status |= TTY_IFEXISTS; 157 else if (vcmp(_TTYS_WINDOW)) 158 tty.ty_window = value(p); 159 else if (vcmp(_TTYS_GROUP)) 160 tty.ty_group = value(p); 161 else 162 break; 163 } 164 165 if (zapchar == '#' || *p == '#') 166 while ((c = *++p) == ' ' || c == '\t') 167 ; 168 tty.ty_comment = p; 169 if (*p == 0) 170 tty.ty_comment = 0; 171 if ( (p = index(p, '\n')) ) 172 *p = '\0'; 173 return (&tty); 174 } 175 176 #define QUOTED 1 177 178 /* 179 * Skip over the current field, removing quotes, and return a pointer to 180 * the next field. 181 */ 182 static char * 183 skip(char *p) 184 { 185 char *t; 186 int c, q; 187 188 for (q = 0, t = p; (c = *p) != '\0'; p++) { 189 if (c == '"') { 190 q ^= QUOTED; /* obscure, but nice */ 191 continue; 192 } 193 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 194 p++; 195 *t++ = *p; 196 if (q == QUOTED) 197 continue; 198 if (c == '#') { 199 zapchar = c; 200 *p = 0; 201 break; 202 } 203 if (c == '\t' || c == ' ' || c == '\n') { 204 zapchar = c; 205 *p++ = 0; 206 while ((c = *p) == '\t' || c == ' ' || c == '\n') 207 p++; 208 break; 209 } 210 } 211 *--t = '\0'; 212 return (p); 213 } 214 215 static char * 216 value(char *p) 217 { 218 219 return ((p = index(p, '=')) ? ++p : NULL); 220 } 221 222 int 223 setttyent(void) 224 { 225 DIR *devpts_dir; 226 struct dirent *dp; 227 int unit; 228 229 if (line == NULL) { 230 if ((line = malloc(MALLOCCHUNK)) == NULL) 231 return (0); 232 lbsize = MALLOCCHUNK; 233 } 234 devpts_dir = opendir(_PATH_DEV PTS); 235 if (devpts_dir) { 236 maxpts = -1; 237 while ((dp = readdir(devpts_dir))) { 238 if (strcmp(dp->d_name, ".") == 0 || 239 strcmp(dp->d_name, "..") == 0) 240 continue; 241 242 unit = (int)strtol(dp->d_name, NULL, 10); 243 244 if (unit > maxpts) { 245 maxpts = unit; 246 curpts = 0; 247 } 248 } 249 closedir(devpts_dir); 250 } 251 if (tf) { 252 rewind(tf); 253 return (1); 254 } else if ( (tf = fopen(_PATH_TTYS, "r")) ) 255 return (1); 256 return (0); 257 } 258 259 int 260 endttyent(void) 261 { 262 int rval; 263 264 maxpts = -1; 265 /* 266 * NB: Don't free `line' because getttynam() 267 * may still be referencing it 268 */ 269 if (tf) { 270 rval = (fclose(tf) != EOF); 271 tf = NULL; 272 return (rval); 273 } 274 return (1); 275 } 276 277 static int 278 isttystat(const char *tty, int flag) 279 { 280 struct ttyent *t; 281 282 return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 283 } 284 285 286 int 287 isdialuptty(const char *tty) 288 { 289 290 return isttystat(tty, TTY_DIALUP); 291 } 292 293 int 294 isnettty(const char *tty) 295 { 296 297 return isttystat(tty, TTY_NETWORK); 298 } 299