1 /* $OpenBSD: from.c,v 1.7 2001/07/12 05:17:06 deraadt Exp $ */ 2 /* $NetBSD: from.c,v 1.6 1995/09/01 01:39:10 jtc Exp $ */ 3 4 /* 5 * Copyright (c) 1980, 1988, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 static char copyright[] = 39 "@(#) Copyright (c) 1980, 1988, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif /* not lint */ 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93"; 46 #endif 47 static char rcsid[] = "$OpenBSD: from.c,v 1.7 2001/07/12 05:17:06 deraadt Exp $"; 48 #endif /* not lint */ 49 50 #include <sys/types.h> 51 #include <ctype.h> 52 #include <pwd.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <unistd.h> 56 #include <paths.h> 57 #include <string.h> 58 #include <err.h> 59 60 int match(char *, char *); 61 62 int 63 main(argc, argv) 64 int argc; 65 char **argv; 66 { 67 extern char *optarg; 68 extern int optind; 69 struct passwd *pwd; 70 int ch, newline; 71 char *file, *sender, *p; 72 #if MAXPATHLEN > BUFSIZ 73 char buf[MAXPATHLEN]; 74 #else 75 char buf[BUFSIZ]; 76 #endif 77 78 file = sender = NULL; 79 while ((ch = getopt(argc, argv, "f:s:")) != -1) 80 switch((char)ch) { 81 case 'f': 82 file = optarg; 83 break; 84 case 's': 85 sender = optarg; 86 for (p = sender; *p; ++p) 87 if (isupper(*p)) 88 *p = tolower(*p); 89 break; 90 case '?': 91 default: 92 fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n"); 93 exit(1); 94 } 95 argv += optind; 96 97 /* 98 * We find the mailbox by: 99 * 1 -f flag 100 * 2 user 101 * 2 MAIL environment variable 102 * 3 _PATH_MAILDIR/file 103 */ 104 if (!file) { 105 if (!(file = *argv)) { 106 if (!(file = getenv("MAIL"))) { 107 if (!(pwd = getpwuid(getuid()))) 108 errx(1, "no password file entry for you"); 109 if ((file = getenv("USER"))) { 110 (void)snprintf(buf, sizeof(buf), 111 "%s/%s", _PATH_MAILDIR, file); 112 file = buf; 113 } else 114 (void)snprintf(file = buf, sizeof(buf), 115 "%s/%s", _PATH_MAILDIR, 116 pwd->pw_name); 117 } 118 } else { 119 (void)snprintf(buf, sizeof(buf), "%s/%s", 120 _PATH_MAILDIR, file); 121 file = buf; 122 } 123 } 124 if (!freopen(file, "r", stdin)) 125 err(1, "%s", file); 126 for (newline = 1; fgets(buf, sizeof(buf), stdin);) { 127 if (*buf == '\n') { 128 newline = 1; 129 continue; 130 } 131 if (newline && !strncmp(buf, "From ", 5) && 132 (!sender || match(buf + 5, sender))) 133 printf("%s", buf); 134 newline = 0; 135 } 136 exit(0); 137 } 138 139 int 140 match(line, sender) 141 char *line, *sender; 142 { 143 register char ch, pch, first, *p, *t; 144 145 for (first = *sender++;;) { 146 if (isspace(ch = *line)) 147 return(0); 148 ++line; 149 if (isupper(ch)) 150 ch = tolower(ch); 151 if (ch != first) 152 continue; 153 for (p = sender, t = line;;) { 154 if (!(pch = *p++)) 155 return(1); 156 if (isupper(ch = *t++)) 157 ch = tolower(ch); 158 if (ch != pch) 159 break; 160 } 161 } 162 /* NOTREACHED */ 163 } 164