remote.c revision 7527
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 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 42static char sccsid[] = "@(#)remote.c 8.1 (Berkeley) 6/6/93"; 43#endif /* not lint */ 44 45#include <sys/syslimits.h> 46#include <stdio.h> 47#include <stdlib.h> 48 49#include "tipconf.h" 50#include "tip.h" 51#include "pathnames.h" 52 53/* 54 * Attributes to be gleened from remote host description 55 * data base. 56 */ 57static char **caps[] = { 58 &AT, &DV, &CM, &CU, &EL, &IE, &OE, &PN, &PR, &DI, 59 &ES, &EX, &FO, &RC, &RE, &PA, &LI, &LO 60}; 61 62static char *capstrings[] = { 63 "at", "dv", "cm", "cu", "el", "ie", "oe", "pn", "pr", 64 "di", "es", "ex", "fo", "rc", "re", "pa", "li", "lo", 0 65}; 66 67static char *db_array[3] = { _PATH_REMOTE, 0, 0 }; 68 69#define cgetflag(f) (cgetcap(bp, f, ':') != NULL) 70 71/* 72 Expand the start tilde sequence at the start of the 73 specified path. Optionally, free space allocated to 74 path before reinitializing it. 75*/ 76static int 77expand_tilde (char **path, void (*free) (char *p)) 78{ 79 int rc = 0; 80 char buffer [PATH_MAX]; 81 char *tailp; 82 if ((tailp = strchr (*path + 1, '/')) != NULL) 83 { 84 struct passwd *pwd; 85 *tailp++ = '\0'; 86 if (*(*path + 1) == '\0') 87 strcpy (buffer, getlogin ()); 88 else 89 strcpy (buffer, *path + 1); 90 if ((pwd = getpwnam (buffer)) != NULL) 91 { 92 strcpy (buffer, pwd->pw_dir); 93 strcat (buffer, "/"); 94 strcat (buffer, tailp); 95 if (free) 96 free (*path); 97 *path = strdup (buffer); 98 rc++; 99 } 100 return rc; 101 } 102} 103 104static 105getremcap(host) 106 register char *host; 107{ 108 register char **p, ***q; 109 char *bp; 110 char *rempath; 111 int stat; 112 113 rempath = getenv("REMOTE"); 114 if (rempath != NULL) 115 if (*rempath != '/') 116 /* we have an entry */ 117 cgetset(rempath); 118 else { /* we have a path */ 119 db_array[1] = rempath; 120 db_array[2] = _PATH_REMOTE; 121 } 122 123 if ((stat = cgetent(&bp, db_array, host)) < 0) { 124 if (DV || 125 host[0] == '/' && access(DV = host, R_OK | W_OK) == 0) { 126 CU = DV; 127 HO = host; 128 HW = 1; 129 DU = 0; 130 if (!BR) 131 BR = DEFBR; 132 FS = DEFFS; 133 return; 134 } 135 switch(stat) { 136 case -1: 137 fprintf(stderr, "tip: unknown host %s\n", host); 138 break; 139 case -2: 140 fprintf(stderr, 141 "tip: can't open host description file\n"); 142 break; 143 case -3: 144 fprintf(stderr, 145 "tip: possible reference loop in host description file\n"); 146 break; 147 } 148 exit(3); 149 } 150 151 for (p = capstrings, q = caps; *p != NULL; p++, q++) 152 if (**q == NULL) 153 cgetstr(bp, *p, *q); 154 if (!BR && (cgetnum(bp, "br", &BR) == -1)) 155 BR = DEFBR; 156 if (cgetnum(bp, "fs", &FS) == -1) 157 FS = DEFFS; 158 if (DU < 0) 159 DU = 0; 160 else 161 DU = cgetflag("du"); 162 if (DV == NOSTR) { 163 fprintf(stderr, "%s: missing device spec\n", host); 164 exit(3); 165 } 166 if (DU && CU == NOSTR) 167 CU = DV; 168 if (DU && PN == NOSTR) { 169 fprintf(stderr, "%s: missing phone number\n", host); 170 exit(3); 171 } 172 173 HD = cgetflag("hd"); 174 175 /* 176 * This effectively eliminates the "hw" attribute 177 * from the description file 178 */ 179 if (!HW) 180 HW = (CU == NOSTR) || (DU && equal(DV, CU)); 181 HO = host; 182 183 /* 184 If login script, verify access 185 */ 186 if (LI != NOSTR) { 187 if (*LI == '~') 188 (void) expand_tilde (&LI, NULL); 189 if (access (LI, F_OK | X_OK) != 0) { 190 printf("tip (warning): can't open login script \"%s\"\n", LI); 191 LI = NOSTR; 192 } 193 } 194 195 /* 196 If logout script, verify access 197 */ 198 if (LO != NOSTR) { 199 if (*LO == '~') 200 (void) expand_tilde (&LO, NULL); 201 if (access (LO, F_OK | X_OK) != 0) { 202 printf("tip (warning): can't open logout script \"%s\"\n", LO); 203 LO = NOSTR; 204 } 205 } 206 207 /* 208 * see if uppercase mode should be turned on initially 209 */ 210 if (cgetflag("ra")) 211 boolean(value(RAISE)) = 1; 212 if (cgetflag("ec")) 213 boolean(value(ECHOCHECK)) = 1; 214 if (cgetflag("be")) 215 boolean(value(BEAUTIFY)) = 1; 216 if (cgetflag("nb")) 217 boolean(value(BEAUTIFY)) = 0; 218 if (cgetflag("sc")) 219 boolean(value(SCRIPT)) = 1; 220 if (cgetflag("tb")) 221 boolean(value(TABEXPAND)) = 1; 222 if (cgetflag("vb")) 223 boolean(value(VERBOSE)) = 1; 224 if (cgetflag("nv")) 225 boolean(value(VERBOSE)) = 0; 226 if (cgetflag("ta")) 227 boolean(value(TAND)) = 1; 228 if (cgetflag("nt")) 229 boolean(value(TAND)) = 0; 230 if (cgetflag("rw")) 231 boolean(value(RAWFTP)) = 1; 232 if (cgetflag("hd")) 233 boolean(value(HALFDUPLEX)) = 1; 234 if (RE == NOSTR) 235 RE = (char *)"tip.record"; 236 if (EX == NOSTR) 237 EX = (char *)"\t\n\b\f"; 238 if (ES != NOSTR) 239 vstring("es", ES); 240 if (FO != NOSTR) 241 vstring("fo", FO); 242 if (PR != NOSTR) 243 vstring("pr", PR); 244 if (RC != NOSTR) 245 vstring("rc", RC); 246 if (cgetnum(bp, "dl", &DL) == -1) 247 DL = 0; 248 if (cgetnum(bp, "cl", &CL) == -1) 249 CL = 0; 250 if (cgetnum(bp, "et", &ET) == -1) 251 ET = 10; 252} 253 254char * 255getremote(host) 256 char *host; 257{ 258 register char *cp; 259 static char *next; 260 static int lookedup = 0; 261 262 if (!lookedup) { 263 if (host == NOSTR && (host = getenv("HOST")) == NOSTR) { 264 fprintf(stderr, "tip: no host specified\n"); 265 exit(3); 266 } 267 getremcap(host); 268 next = DV; 269 lookedup++; 270 } 271 /* 272 * We return a new device each time we're called (to allow 273 * a rotary action to be simulated) 274 */ 275 if (next == NOSTR) 276 return (NOSTR); 277 if ((cp = index(next, ',')) == NULL) { 278 DV = next; 279 next = NOSTR; 280 } else { 281 *cp++ = '\0'; 282 DV = next; 283 next = cp; 284 } 285 return (DV); 286} 287