1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #include "mail.h" 33 #ifdef SVR4 34 #include <locale.h> 35 #endif 36 /* 37 * mail [ -ehpPqrtw ] [-x debuglevel] [ -f file ] [ -F user(s) ] 38 * mail -T file persons 39 * mail [ -tw ] [ -m messagetype ] persons 40 * rmail [ -tw ] persons 41 */ 42 int 43 main(int argc, char **argv) 44 { 45 register int i; 46 char *cptr, *p; 47 struct stat statb; 48 static char pn[] = "main"; 49 extern char **environ; 50 int env_var_idx, next_slot_idx; 51 int tmpfd = -1; 52 53 #ifdef SVR4 54 (void) setlocale(LC_ALL, ""); 55 #endif 56 /* fix here for bug #1086130 - security hole */ 57 /* skip over the LD_* env variable */ 58 env_var_idx = 0; next_slot_idx = 0; 59 while (environ[env_var_idx] != NULL) { 60 environ[next_slot_idx] = environ[env_var_idx]; 61 if (strncmp(environ[env_var_idx], "LD_", 3)) { 62 next_slot_idx++; 63 } 64 env_var_idx++; 65 } 66 environ[next_slot_idx] = NULL; 67 68 #ifdef SIGCONT 69 #ifdef SVR4 70 { 71 struct sigaction nsig; 72 nsig.sa_handler = SIG_DFL; 73 sigemptyset(&nsig.sa_mask); 74 nsig.sa_flags = SA_RESTART; 75 (void) sigaction(SIGCONT, &nsig, (struct sigaction *)0); 76 } 77 #else 78 sigset(SIGCONT, SIG_DFL); 79 #endif 80 #endif 81 82 /* 83 * Strip off path name of this command for use in messages 84 */ 85 if ((program = strrchr(argv[0], '/')) != NULL) { 86 program++; 87 } else { 88 program = argv[0]; 89 } 90 91 /* Close all file descriptors except stdin, stdout & stderr */ 92 closefrom(STDERR_FILENO + 1); 93 94 /* 95 * Get group id for mail, exit if none exists 96 */ 97 if ((grpptr = getgrnam("mail")) == NULL) { 98 errmsg(E_GROUP, ""); 99 exit(1); 100 } else { 101 mailgrp = grpptr->gr_gid; 102 } 103 104 /* 105 * Save the *id for later use. 106 */ 107 my_uid = getuid(); 108 my_gid = getgid(); 109 my_euid = geteuid(); 110 my_egid = getegid(); 111 112 /* 113 * What command (rmail or mail)? 114 */ 115 if (strcmp(program, "rmail") == SAME) { 116 ismail = FALSE; 117 } 118 119 /* 120 * Parse the command line and adjust argc and argv 121 * to compensate for any options 122 */ 123 i = parse(argc, argv); 124 argv += (i - 1); 125 argc -= (i - 1); 126 127 /* block a potential security hole */ 128 if (flgT && (my_euid != 0)) { 129 setgid(my_gid); 130 Tout(pn, "Setgid unset\n"); 131 } 132 133 if (debug == 0) { 134 /* If not set as an invocation option, check for system-wide */ 135 /* global flag */ 136 char *xp = xgetenv("DEBUG"); 137 if (xp != (char *)NULL) { 138 debug = atoi(xp); 139 if (debug < 0) { 140 /* Keep trace file even if successful */ 141 keepdbgfile = -1; 142 debug = -debug; 143 } 144 } 145 } 146 if (debug > 0) { 147 strcpy(dbgfname, "/tmp/MLDBGXXXXXX"); 148 if ((tmpfd = mkstemp(dbgfname)) == -1) { 149 fprintf(stderr, "%s: can't open debugging file '%s'\n", 150 program, dbgfname); 151 exit(13); 152 } 153 if ((dbgfp = fdopen(tmpfd, "w")) == (FILE *)NULL) { 154 fprintf(stderr, "%s: can't open debugging file '%s'\n", 155 program, dbgfname); 156 (void) close(tmpfd); 157 exit(13); 158 } 159 setbuf(dbgfp, NULL); 160 fprintf(dbgfp, "main(): debugging level == %d\n", debug); 161 fprintf(dbgfp, "main(): trace file ='%s': kept %s\n", dbgfname, 162 ((keepdbgfile < 0) ? 163 "on success or failure." : "only on failure.")); 164 } 165 166 if (!ismail && (goerr > 0 || !i)) { 167 Dout(pn, 11, "!ismail, goerr=%d, i=%d\n", goerr, i); 168 if (goerr > 0) { 169 errmsg(E_SYNTAX, "Usage: rmail [-wt] person(s)"); 170 } 171 if (!i) { 172 errmsg(E_SYNTAX, "At least one user must be specified"); 173 } 174 Dout(pn, 11, "exiting!\n"); 175 done(0); 176 } 177 178 umsave = umask(7); 179 uname(&utsn); 180 if ((p = xgetenv("CLUSTER")) != (char *)NULL) { 181 /* 182 * We are not who we appear... 183 */ 184 thissys = p; 185 } else { 186 thissys = utsn.nodename; 187 } 188 Dout(pn, 11, "thissys = '%s', uname = '%s'\n", thissys, utsn.nodename); 189 190 failsafe = xgetenv("FAILSAFE"); 191 if (failsafe) 192 Dout(pn, 11, "failsafe processing enabled to %s\n", failsafe); 193 194 /* 195 * Use environment variables 196 */ 197 home = getenv("HOME"); 198 if (!home || !*home) { 199 home = "."; 200 } 201 202 my_name[0] = '\0'; 203 pwd = getpwuid(my_uid); 204 if (pwd) 205 (void) strlcpy(my_name, pwd->pw_name, sizeof (my_name)); 206 207 /* If root, use LOGNAME if set */ 208 if (my_uid == 0) { 209 /* If root, use LOGNAME if set */ 210 if (((cptr = getenv("LOGNAME")) != NULL) && 211 (strlen(cptr) != 0)) { 212 (void) strlcpy(my_name, cptr, sizeof (my_name)); 213 } 214 } 215 Dout(pn, 11, "my_name = '%s'\n", my_name); 216 217 /* 218 * Catch signals for cleanup 219 */ 220 if (setjmp(sjbuf)) { 221 done(0); 222 } 223 for (i = SIGINT; i < SIGCLD; i++) { 224 setsig(i, delete); 225 } 226 setsig(SIGHUP, sig_done); 227 setsig(SIGTERM, sig_done); 228 229 cksaved(my_name); 230 231 /* 232 * Rmail is always invoked to send mail 233 */ 234 Dout(pn, 11, "ismail=%d, argc=%d\n", ismail, argc); 235 if (ismail && (argc == 1)) { 236 sending = FALSE; 237 printmail(); 238 239 } else { 240 sending = TRUE; 241 sendmail(argc, argv); 242 } 243 done(0); 244 } 245