getttyent.c revision 200150
1207151Smarius/* 2207151Smarius * Copyright (c) 1989, 1993 3207151Smarius * The Regents of the University of California. All rights reserved. 4207151Smarius * 5207151Smarius * Redistribution and use in source and binary forms, with or without 6207151Smarius * modification, are permitted provided that the following conditions 7207151Smarius * are met: 8207151Smarius * 1. Redistributions of source code must retain the above copyright 9207151Smarius * notice, this list of conditions and the following disclaimer. 10207151Smarius * 2. Redistributions in binary form must reproduce the above copyright 11207151Smarius * notice, this list of conditions and the following disclaimer in the 12207151Smarius * documentation and/or other materials provided with the distribution. 13207151Smarius * 4. Neither the name of the University nor the names of its contributors 14207151Smarius * may be used to endorse or promote products derived from this software 15207151Smarius * without specific prior written permission. 16207151Smarius * 17207151Smarius * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18207151Smarius * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19207151Smarius * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20207151Smarius * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21207151Smarius * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22207151Smarius * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23207151Smarius * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24207151Smarius * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25207151Smarius * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26207151Smarius * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27207151Smarius * SUCH DAMAGE. 28207151Smarius */ 29207151Smarius 30207151Smarius#if defined(LIBC_SCCS) && !defined(lint) 31207151Smariusstatic char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; 32207151Smarius#endif /* LIBC_SCCS and not lint */ 33207151Smarius#include <sys/cdefs.h> 34207151Smarius__FBSDID("$FreeBSD: head/lib/libc/gen/getttyent.c 200150 2009-12-05 19:31:38Z ed $"); 35207151Smarius 36207151Smarius#include <ttyent.h> 37207151Smarius#include <stdio.h> 38207151Smarius#include <stdlib.h> 39207151Smarius#include <ctype.h> 40207151Smarius#include <string.h> 41207151Smarius#include <dirent.h> 42207151Smarius#include <paths.h> 43207151Smarius 44207151Smariusstatic char zapchar; 45207151Smariusstatic FILE *tf; 46207151Smariusstatic int maxpts = -1; 47207151Smariusstatic int curpts = 0; 48207151Smariusstatic size_t lbsize; 49207151Smariusstatic char *line; 50207151Smarius 51207151Smarius#define PTS "pts/" 52207151Smarius#define MALLOCCHUNK 100 53207151Smarius 54207151Smariusstatic char *skip(char *); 55207151Smariusstatic char *value(char *); 56207151Smarius 57207151Smariusstruct ttyent * 58207151Smariusgetttynam(const char *tty) 59207151Smarius{ 60207151Smarius struct ttyent *t; 61207151Smarius 62207151Smarius if (strncmp(tty, "/dev/", 5) == 0) 63207151Smarius tty += 5; 64207151Smarius setttyent(); 65207151Smarius while ( (t = getttyent()) ) 66207151Smarius if (!strcmp(tty, t->ty_name)) 67207151Smarius break; 68207151Smarius endttyent(); 69207151Smarius return (t); 70207151Smarius} 71207151Smarius 72207151Smariusstruct ttyent * 73207151Smariusgetttyent(void) 74207151Smarius{ 75207151Smarius static struct ttyent tty; 76207151Smarius static char devpts_name[] = "pts/4294967295"; 77207151Smarius char *p; 78207151Smarius int c; 79207151Smarius size_t i; 80207151Smarius 81207151Smarius if (!tf && !setttyent()) 82207151Smarius return (NULL); 83207151Smarius for (;;) { 84207151Smarius if (!fgets(p = line, lbsize, tf)) { 85207151Smarius if (curpts <= maxpts) { 86207151Smarius sprintf(devpts_name, "pts/%d", curpts++); 87207151Smarius tty.ty_name = devpts_name; 88207151Smarius tty.ty_getty = tty.ty_type = NULL; 89207151Smarius tty.ty_status = TTY_NETWORK; 90207151Smarius tty.ty_window = NULL; 91207151Smarius tty.ty_comment = NULL; 92207151Smarius tty.ty_group = _TTYS_NOGROUP; 93207151Smarius return (&tty); 94207151Smarius } 95207151Smarius return (NULL); 96207151Smarius } 97207151Smarius /* extend buffer if line was too big, and retry */ 98207151Smarius while (!index(p, '\n') && !feof(tf)) { 99207151Smarius i = strlen(p); 100207151Smarius lbsize += MALLOCCHUNK; 101207151Smarius if ((p = realloc(line, lbsize)) == NULL) { 102207151Smarius (void)endttyent(); 103207151Smarius return (NULL); 104207151Smarius } 105207151Smarius line = p; 106207151Smarius if (!fgets(&line[i], lbsize - i, tf)) 107207151Smarius return (NULL); 108207151Smarius } 109207151Smarius while (isspace((unsigned char)*p)) 110207151Smarius ++p; 111207151Smarius if (*p && *p != '#') 112207151Smarius break; 113207151Smarius } 114207151Smarius 115207151Smarius#define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1]) 116207151Smarius#define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '=' 117207151Smarius 118207151Smarius zapchar = 0; 119207151Smarius tty.ty_name = p; 120207151Smarius tty.ty_status = 0; 121207151Smarius tty.ty_window = NULL; 122207151Smarius tty.ty_group = _TTYS_NOGROUP; 123207151Smarius 124207151Smarius p = skip(p); 125207151Smarius if (!*(tty.ty_getty = p)) 126207151Smarius tty.ty_getty = tty.ty_type = NULL; 127207151Smarius else { 128207151Smarius p = skip(p); 129207151Smarius if (!*(tty.ty_type = p)) 130207151Smarius tty.ty_type = NULL; 131207151Smarius else { 132207151Smarius /* compatibility kludge: handle network/dialup specially */ 133207151Smarius if (scmp(_TTYS_DIALUP)) 134207151Smarius tty.ty_status |= TTY_DIALUP; 135207151Smarius else if (scmp(_TTYS_NETWORK)) 136207151Smarius tty.ty_status |= TTY_NETWORK; 137207151Smarius p = skip(p); 138207151Smarius } 139207151Smarius } 140207151Smarius 141207151Smarius for (; *p; p = skip(p)) { 142207151Smarius if (scmp(_TTYS_OFF)) 143207151Smarius tty.ty_status &= ~TTY_ON; 144207151Smarius else if (scmp(_TTYS_ON)) 145207151Smarius tty.ty_status |= TTY_ON; 146207151Smarius else if (scmp(_TTYS_SECURE)) 147207151Smarius tty.ty_status |= TTY_SECURE; 148207151Smarius else if (scmp(_TTYS_INSECURE)) 149207151Smarius tty.ty_status &= ~TTY_SECURE; 150207151Smarius else if (scmp(_TTYS_DIALUP)) 151207151Smarius tty.ty_status |= TTY_DIALUP; 152207151Smarius else if (scmp(_TTYS_NETWORK)) 153207151Smarius tty.ty_status |= TTY_NETWORK; 154207151Smarius else if (vcmp(_TTYS_WINDOW)) 155207151Smarius tty.ty_window = value(p); 156207151Smarius else if (vcmp(_TTYS_GROUP)) 157207151Smarius tty.ty_group = value(p); 158207151Smarius else 159207151Smarius break; 160207151Smarius } 161207151Smarius 162207151Smarius if (zapchar == '#' || *p == '#') 163207151Smarius while ((c = *++p) == ' ' || c == '\t') 164207151Smarius ; 165207151Smarius tty.ty_comment = p; 166207151Smarius if (*p == 0) 167207151Smarius tty.ty_comment = 0; 168207151Smarius if ( (p = index(p, '\n')) ) 169207151Smarius *p = '\0'; 170207151Smarius return (&tty); 171207151Smarius} 172207151Smarius 173207151Smarius#define QUOTED 1 174207151Smarius 175207151Smarius/* 176207151Smarius * Skip over the current field, removing quotes, and return a pointer to 177207151Smarius * the next field. 178207151Smarius */ 179207151Smariusstatic char * 180207151Smariusskip(char *p) 181207151Smarius{ 182207151Smarius char *t; 183207151Smarius int c, q; 184207151Smarius 185207151Smarius for (q = 0, t = p; (c = *p) != '\0'; p++) { 186207151Smarius if (c == '"') { 187 q ^= QUOTED; /* obscure, but nice */ 188 continue; 189 } 190 if (q == QUOTED && *p == '\\' && *(p+1) == '"') 191 p++; 192 *t++ = *p; 193 if (q == QUOTED) 194 continue; 195 if (c == '#') { 196 zapchar = c; 197 *p = 0; 198 break; 199 } 200 if (c == '\t' || c == ' ' || c == '\n') { 201 zapchar = c; 202 *p++ = 0; 203 while ((c = *p) == '\t' || c == ' ' || c == '\n') 204 p++; 205 break; 206 } 207 } 208 *--t = '\0'; 209 return (p); 210} 211 212static char * 213value(char *p) 214{ 215 216 return ((p = index(p, '=')) ? ++p : NULL); 217} 218 219int 220setttyent(void) 221{ 222 DIR *devpts_dir; 223 224 if (line == NULL) { 225 if ((line = malloc(MALLOCCHUNK)) == NULL) 226 return (0); 227 lbsize = MALLOCCHUNK; 228 } 229 devpts_dir = opendir(_PATH_DEV PTS); 230 if (devpts_dir) { 231 struct dirent *dp; 232 233 maxpts = -1; 234 while ((dp = readdir(devpts_dir))) { 235 if (strcmp(dp->d_name, ".") != 0 && 236 strcmp(dp->d_name, "..") != 0) { 237 if (atoi(dp->d_name) > maxpts) { 238 maxpts = atoi(dp->d_name); 239 curpts = 0; 240 } 241 } 242 } 243 closedir(devpts_dir); 244 } 245 if (tf) { 246 rewind(tf); 247 return (1); 248 } else if ( (tf = fopen(_PATH_TTYS, "r")) ) 249 return (1); 250 return (0); 251} 252 253int 254endttyent(void) 255{ 256 int rval; 257 258 maxpts = -1; 259 /* 260 * NB: Don't free `line' because getttynam() 261 * may still be referencing it 262 */ 263 if (tf) { 264 rval = (fclose(tf) != EOF); 265 tf = NULL; 266 return (rval); 267 } 268 return (1); 269} 270 271static int 272isttystat(const char *tty, int flag) 273{ 274 struct ttyent *t; 275 276 return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag); 277} 278 279 280int 281isdialuptty(const char *tty) 282{ 283 284 return isttystat(tty, TTY_DIALUP); 285} 286 287int 288isnettty(const char *tty) 289{ 290 291 return isttystat(tty, TTY_NETWORK); 292} 293