1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1992-2009 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * * 20 ***********************************************************************/ 21 #pragma prototyped 22 23 static const char usage[] = 24 "[-?\n@(#)$Id: mktemp (AT&T Research) 2009-06-19 $\n]" 25 USAGE_LICENSE 26 "[+NAME?mktemp - make temporary file or directory]" 27 "[+DESCRIPTION?\bmktemp\b creates a temporary file with optional base " 28 "name prefix \aprefix\a. If \aprefix\a is omitted then \btmp_\b is used " 29 "and \b--tmp\b is implied. If \aprefix\a contains a directory prefix " 30 "then that directory overrides any of the directories described below. A " 31 "temporary file will have mode \brw-------\b and a temporary directory " 32 "will have mode \brwx------\b, subject to \bumask\b(1). Generated paths " 33 "have these attributes:]" 34 "{" 35 "[+*?Lower case to avoid clashes on case ignorant filesystems.]" 36 "[+*?Pseudo-random part to deter denial of service attacks.]" 37 "[+*?Pseudo-random part is \a3-chars\a.\a3-chars\a to accomodate " 38 "8.3 filesystems.]" 39 "}" 40 "[+?A consecutive sequence of \bX\b's in \aprefix\a is replaced by the " 41 "pseudo-random part. If there are no \bX\b's then the pseudo-random part " 42 "is appended to the prefix.]" 43 "[d:directory?Create a directory instead of a regular file.]" 44 "[m:mode]:[mode?Set the mode of the created temporary to \amode\a. " 45 "\amode\a is symbolic or octal mode as in \bchmod\b(1). Relative modes " 46 "assume an initial mode of \bu=rwx\b.]" 47 "[p:default?Use \adirectory\a if the \bTMPDIR\b environment variable is " 48 "not defined. Implies \b--tmp\b.]:[directory]" 49 "[q:quiet?Suppress file and directory error diagnostics.]" 50 "[t:tmp|temporary-directory?Create a path rooted in a temporary " 51 "directory.]" 52 "[u:unsafe|dry-run?Check for file/directory existence but do not create. " 53 "Who would want to do that.]" 54 "\n" 55 "\n[ prefix ]\n" 56 "\n" 57 "[+SEE ALSO?\bmkdir\b(1), \bpathtemp\b(3), \bmktemp\b(3)]" 58 ; 59 60 #include <cmd.h> 61 #include <ls.h> 62 63 int 64 b_mktemp(int argc, char** argv, void* context) 65 { 66 mode_t mode = 0; 67 mode_t mask; 68 int fd; 69 int i; 70 int quiet = 0; 71 int unsafe = 0; 72 int* fdp = &fd; 73 char* dir = ""; 74 char* pfx; 75 char* t; 76 char path[PATH_MAX]; 77 78 cmdinit(argc, argv, context, ERROR_CATALOG, ERROR_NOTIFY); 79 for (;;) 80 { 81 switch (optget(argv, usage)) 82 { 83 case 0: 84 break; 85 case 'd': 86 fdp = 0; 87 continue; 88 case 'm': 89 mode = strperm(pfx = opt_info.arg, &opt_info.arg, S_IRWXU); 90 if (*opt_info.arg) 91 error(ERROR_exit(0), "%s: invalid mode", pfx); 92 continue; 93 case 'p': 94 if ((t = getenv("TMPDIR")) && *t) 95 dir = 0; 96 else 97 dir = opt_info.arg; 98 continue; 99 case 'q': 100 quiet = 1; 101 continue; 102 case 't': 103 dir = 0; 104 continue; 105 case 'u': 106 unsafe = 1; 107 fdp = 0; 108 continue; 109 case ':': 110 error(2, "%s", opt_info.arg); 111 continue; 112 case '?': 113 error(ERROR_usage(2), "%s", opt_info.arg); 114 continue; 115 } 116 break; 117 } 118 argv += opt_info.index; 119 if (error_info.errors || (pfx = *argv++) && *argv) 120 error(ERROR_usage(2), "%s", optusage(NiL)); 121 mask = umask(0); 122 if (!mode) 123 mode = (fdp ? (S_IRUSR|S_IWUSR) : S_IRWXU) & ~mask; 124 umask(~mode & (S_IRWXU|S_IRWXG|S_IRWXO)); 125 if (!pfx) 126 { 127 pfx = "tmp_"; 128 if (dir && !*dir) 129 dir = 0; 130 } 131 if (t = strrchr(pfx, '/')) 132 { 133 i = ++t - pfx; 134 dir = fmtbuf(i); 135 memcpy(dir, pfx, i); 136 dir[i] = 0; 137 pfx = t; 138 } 139 for (;;) 140 { 141 if (!pathtemp(path, sizeof(path), dir, pfx, fdp)) 142 { 143 if (quiet) 144 error_info.errors++; 145 else 146 error(ERROR_SYSTEM|2, "cannot create temporary path"); 147 break; 148 } 149 if (fdp || unsafe || !mkdir(path, mode)) 150 { 151 if (fdp) 152 close(*fdp); 153 sfputr(sfstdout, path, '\n'); 154 break; 155 } 156 if (sh_checksig(context)) 157 { 158 error_info.errors++; 159 break; 160 } 161 } 162 umask(mask); 163 return error_info.errors != 0; 164 } 165