remote.c revision 28365
1/* 2 * Copyright (c) 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#ifndef lint 36static const char copyright[] = 37"@(#) Copyright (c) 1992, 1993\n\ 38 The Regents of the University of California. All rights reserved.\n"; 39#endif /* not lint */ 40 41#ifndef lint 42#if 0 43static char sccsid[] = "@(#)remote.c 8.1 (Berkeley) 6/6/93"; 44#endif 45static const char rcsid[] = 46 "$Id$"; 47#endif /* not lint */ 48 49#include <sys/syslimits.h> 50#include <err.h> 51#include <stdio.h> 52#include <stdlib.h> 53 54#include "tipconf.h" 55#include "tip.h" 56#include "pathnames.h" 57 58/* 59 * Attributes to be gleened from remote host description 60 * data base. 61 */ 62static char **caps[] = { 63 &AT, &DV, &CM, &CU, &EL, &IE, &OE, &PN, &PR, &DI, 64 &ES, &EX, &FO, &RC, &RE, &PA, &LI, &LO 65}; 66 67static char *capstrings[] = { 68 "at", "dv", "cm", "cu", "el", "ie", "oe", "pn", "pr", 69 "di", "es", "ex", "fo", "rc", "re", "pa", "li", "lo", 0 70}; 71 72static char *db_array[3] = { _PATH_REMOTE, 0, 0 }; 73 74#define cgetflag(f) (cgetcap(bp, f, ':') != NULL) 75 76static void getremcap __P((char *)); 77 78/* 79 Expand the start tilde sequence at the start of the 80 specified path. Optionally, free space allocated to 81 path before reinitializing it. 82*/ 83static int 84expand_tilde (char **path, void (*free) (char *p)) 85{ 86 int rc = 0; 87 char buffer [PATH_MAX]; 88 char *tailp; 89 if ((tailp = strchr (*path + 1, '/')) != NULL) 90 { 91 struct passwd *pwd; 92 *tailp++ = '\0'; 93 if (*(*path + 1) == '\0') 94 strcpy (buffer, getlogin ()); 95 else 96 strcpy (buffer, *path + 1); 97 if ((pwd = getpwnam (buffer)) != NULL) 98 { 99 strcpy (buffer, pwd->pw_dir); 100 strcat (buffer, "/"); 101 strcat (buffer, tailp); 102 if (free) 103 free (*path); 104 *path = strdup (buffer); 105 rc++; 106 } 107 return rc; 108 } 109 return (-1); 110} 111 112static void 113getremcap(host) 114 register char *host; 115{ 116 register char **p, ***q; 117 char *bp; 118 char *rempath; 119 int stat; 120 121 rempath = getenv("REMOTE"); 122 if (rempath != NULL) 123 if (*rempath != '/') 124 /* we have an entry */ 125 cgetset(rempath); 126 else { /* we have a path */ 127 db_array[1] = rempath; 128 db_array[2] = _PATH_REMOTE; 129 } 130 131 if ((stat = cgetent(&bp, db_array, host)) < 0) { 132 if (DV || 133 (host[0] == '/' && access(DV = host, R_OK | W_OK) == 0)) { 134 CU = DV; 135 HO = host; 136 HW = 1; 137 DU = 0; 138 if (!BR) 139 BR = DEFBR; 140 FS = DEFFS; 141 return; 142 } 143 switch(stat) { 144 case -1: 145 warnx("unknown host %s", host); 146 break; 147 case -2: 148 warnx("can't open host description file"); 149 break; 150 case -3: 151 warnx("possible reference loop in host description file"); 152 break; 153 } 154 exit(3); 155 } 156 157 for (p = capstrings, q = caps; *p != NULL; p++, q++) 158 if (**q == NULL) 159 cgetstr(bp, *p, *q); 160 if (!BR && (cgetnum(bp, "br", &BR) == -1)) 161 BR = DEFBR; 162 if (cgetnum(bp, "fs", &FS) == -1) 163 FS = DEFFS; 164 if (DU < 0) 165 DU = 0; 166 else 167 DU = cgetflag("du"); 168 if (DV == NOSTR) { 169 fprintf(stderr, "%s: missing device spec\n", host); 170 exit(3); 171 } 172 if (DU && CU == NOSTR) 173 CU = DV; 174 if (DU && PN == NOSTR) { 175 fprintf(stderr, "%s: missing phone number\n", host); 176 exit(3); 177 } 178 179 HD = cgetflag("hd"); 180 181 /* 182 * This effectively eliminates the "hw" attribute 183 * from the description file 184 */ 185 if (!HW) 186 HW = (CU == NOSTR) || (DU && equal(DV, CU)); 187 HO = host; 188 189 /* 190 If login script, verify access 191 */ 192 if (LI != NOSTR) { 193 if (*LI == '~') 194 (void) expand_tilde (&LI, NULL); 195 if (access (LI, F_OK | X_OK) != 0) { 196 printf("tip (warning): can't open login script \"%s\"\n", LI); 197 LI = NOSTR; 198 } 199 } 200 201 /* 202 If logout script, verify access 203 */ 204 if (LO != NOSTR) { 205 if (*LO == '~') 206 (void) expand_tilde (&LO, NULL); 207 if (access (LO, F_OK | X_OK) != 0) { 208 printf("tip (warning): can't open logout script \"%s\"\n", LO); 209 LO = NOSTR; 210 } 211 } 212 213 /* 214 * see if uppercase mode should be turned on initially 215 */ 216 if (cgetflag("ra")) 217 boolean(value(RAISE)) = 1; 218 if (cgetflag("ec")) 219 boolean(value(ECHOCHECK)) = 1; 220 if (cgetflag("be")) 221 boolean(value(BEAUTIFY)) = 1; 222 if (cgetflag("nb")) 223 boolean(value(BEAUTIFY)) = 0; 224 if (cgetflag("sc")) 225 boolean(value(SCRIPT)) = 1; 226 if (cgetflag("tb")) 227 boolean(value(TABEXPAND)) = 1; 228 if (cgetflag("vb")) 229 boolean(value(VERBOSE)) = 1; 230 if (cgetflag("nv")) 231 boolean(value(VERBOSE)) = 0; 232 if (cgetflag("ta")) 233 boolean(value(TAND)) = 1; 234 if (cgetflag("nt")) 235 boolean(value(TAND)) = 0; 236 if (cgetflag("rw")) 237 boolean(value(RAWFTP)) = 1; 238 if (cgetflag("hd")) 239 boolean(value(HALFDUPLEX)) = 1; 240 if (RE == NOSTR) 241 RE = (char *)"tip.record"; 242 if (EX == NOSTR) 243 EX = (char *)"\t\n\b\f"; 244 if (ES != NOSTR) 245 vstring("es", ES); 246 if (FO != NOSTR) 247 vstring("fo", FO); 248 if (PR != NOSTR) 249 vstring("pr", PR); 250 if (RC != NOSTR) 251 vstring("rc", RC); 252 if (cgetnum(bp, "dl", &DL) == -1) 253 DL = 0; 254 if (cgetnum(bp, "cl", &CL) == -1) 255 CL = 0; 256 if (cgetnum(bp, "et", &ET) == -1) 257 ET = 10; 258} 259 260char * 261getremote(host) 262 char *host; 263{ 264 register char *cp; 265 static char *next; 266 static int lookedup = 0; 267 268 if (!lookedup) { 269 if (host == NOSTR && (host = getenv("HOST")) == NOSTR) 270 errx(3, "no host specified"); 271 getremcap(host); 272 next = DV; 273 lookedup++; 274 } 275 /* 276 * We return a new device each time we're called (to allow 277 * a rotary action to be simulated) 278 */ 279 if (next == NOSTR) 280 return (NOSTR); 281 if ((cp = index(next, ',')) == NULL) { 282 DV = next; 283 next = NOSTR; 284 } else { 285 *cp++ = '\0'; 286 DV = next; 287 next = cp; 288 } 289 return (DV); 290} 291