1 /* 2 * $Id: info_passwd.c,v 5.2 90/06/23 22:19:34 jsp Rel $ 3 * 4 * Copyright (c) 1990 Jan-Simon Pendry 5 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine 6 * Copyright (c) 1990 The Regents of the University of California. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * Jan-Simon Pendry at Imperial College, London. 11 * 12 * %sccs.include.redist.c% 13 * 14 * @(#)info_passwd.c 5.1 (Berkeley) 06/29/90 15 */ 16 17 /* 18 * Get info from password "file" 19 * 20 * This is experimental and probably doesn't 21 * do what you expect. 22 */ 23 24 #include "am.h" 25 26 #ifdef HAS_PASSWD_MAPS 27 #include <pwd.h> 28 29 #define PASSWD_MAP "/etc/passwd" 30 31 /* 32 * Nothing to probe - check the map name is PASSWD_MAP. 33 */ 34 passwd_init(map) 35 char *map; 36 { 37 return strcmp(map, PASSWD_MAP) == 0 ? 0 : ENOENT; 38 } 39 40 41 /* 42 * Grab the entry via the getpwname routine 43 * Modify time is ignored by passwd - XXX 44 */ 45 int passwd_search(m, map, key, pval, tp) 46 mnt_map *m; 47 char *map; 48 char *key; 49 char **pval; 50 time_t *tp; 51 { 52 char *dir = 0; 53 struct passwd *pw; 54 if (strcmp(key, "/defaults") == 0) { 55 *pval = strdup("type:=nfs"); 56 return 0; 57 } 58 59 pw = getpwnam(key); 60 if (pw) { 61 /* 62 * We chop the home directory up as follows: 63 * /anydir/dom1/dom2/dom3/user 64 * 65 * and return 66 * rfs:=/anydir/dom3;rhost:=dom3.dom2.dom1;sublink:=user 67 * 68 * This allows cross-domain entries in your passwd file. 69 * ... but forget about security! 70 */ 71 char *user; 72 char *p, *q; 73 char val[MAXPATHLEN]; 74 char rhost[MAXHOSTNAMELEN]; 75 dir = strdup(pw->pw_dir); 76 /* 77 * Find user name. If no / then Invalid... 78 */ 79 user = strrchr(dir, '/'); 80 if (!user) 81 goto enoent; 82 *user++ = '\0'; 83 /* 84 * Find start of host "path". If no / then Invalid... 85 */ 86 p = strchr(dir+1, '/'); 87 if (!p) 88 goto enoent; 89 *p++ = '\0'; 90 /* 91 * At this point, p is dom1/dom2/dom3 92 * Copy, backwards, into rhost replacing 93 * / with . 94 */ 95 rhost[0] = '\0'; 96 do { 97 q = strrchr(p, '/'); 98 if (q) { 99 strcat(rhost, q + 1); 100 strcat(rhost, "."); 101 *q = '\0'; 102 } else { 103 strcat(rhost, p); 104 } 105 } while (q); 106 /* 107 * Sanity check 108 */ 109 if (*rhost == '\0' || *user == '\0' || *dir == '\0') 110 goto enoent; 111 /* 112 * Make up return string 113 */ 114 q = strchr(rhost, '.'); 115 if (q) 116 *q = '\0'; 117 sprintf(val, "rfs:=%s/%s;rhost:=%s;sublink:=%s;fs:=${autodir}%s", 118 dir, rhost, rhost, user, pw->pw_dir); 119 if (q) 120 *q = '.'; 121 *pval = strdup(val); 122 return 0; 123 } 124 125 enoent: 126 if (dir) 127 free(dir); 128 129 return ENOENT; 130 } 131 #endif /* HAS_PASSWD_MAPS */ 132