1 /* $OpenBSD: from.c,v 1.10 2003/06/10 22:20:46 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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 static char copyright[] = 35 "@(#) Copyright (c) 1980, 1988, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93"; 42 #endif 43 static char rcsid[] = "$OpenBSD: from.c,v 1.10 2003/06/10 22:20:46 deraadt Exp $"; 44 #endif /* not lint */ 45 46 #include <sys/types.h> 47 #include <ctype.h> 48 #include <pwd.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <unistd.h> 52 #include <paths.h> 53 #include <string.h> 54 #include <err.h> 55 56 int match(char *, char *); 57 58 int 59 main(int argc, char *argv[]) 60 { 61 extern char *optarg; 62 extern int optind; 63 struct passwd *pwd; 64 int ch, newline; 65 char *file, *sender, *p; 66 #if MAXPATHLEN > BUFSIZ 67 char buf[MAXPATHLEN]; 68 #else 69 char buf[BUFSIZ]; 70 #endif 71 72 file = sender = NULL; 73 while ((ch = getopt(argc, argv, "f:s:")) != -1) 74 switch((char)ch) { 75 case 'f': 76 file = optarg; 77 break; 78 case 's': 79 sender = optarg; 80 for (p = sender; *p; ++p) 81 if (isupper(*p)) 82 *p = tolower(*p); 83 break; 84 case '?': 85 default: 86 fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n"); 87 exit(1); 88 } 89 argv += optind; 90 91 /* 92 * We find the mailbox by: 93 * 1 -f flag 94 * 2 user 95 * 2 MAIL environment variable 96 * 3 _PATH_MAILDIR/file 97 */ 98 if (!file) { 99 if (!(file = *argv)) { 100 if (!(file = getenv("MAIL"))) { 101 if (!(pwd = getpwuid(getuid()))) 102 errx(1, "no password file entry for you"); 103 if ((file = getenv("USER"))) { 104 (void)snprintf(buf, sizeof(buf), 105 "%s/%s", _PATH_MAILDIR, file); 106 file = buf; 107 } else 108 (void)snprintf(file = buf, sizeof(buf), 109 "%s/%s", _PATH_MAILDIR, 110 pwd->pw_name); 111 } 112 } else { 113 (void)snprintf(buf, sizeof(buf), "%s/%s", 114 _PATH_MAILDIR, file); 115 file = buf; 116 } 117 } 118 if (!freopen(file, "r", stdin)) 119 err(1, "%s", file); 120 for (newline = 1; fgets(buf, sizeof(buf), stdin);) { 121 if (*buf == '\n') { 122 newline = 1; 123 continue; 124 } 125 if (newline && !strncmp(buf, "From ", 5) && 126 (!sender || match(buf + 5, sender))) 127 printf("%s", buf); 128 newline = 0; 129 } 130 exit(0); 131 } 132 133 int 134 match(char *line, char *sender) 135 { 136 char ch, pch, first, *p, *t; 137 138 for (first = *sender++;;) { 139 if (isspace(ch = *line)) 140 return(0); 141 ++line; 142 if (isupper(ch)) 143 ch = tolower(ch); 144 if (ch != first) 145 continue; 146 for (p = sender, t = line;;) { 147 if (!(pch = *p++)) 148 return(1); 149 if (isupper(ch = *t++)) 150 ch = tolower(ch); 151 if (ch != pch) 152 break; 153 } 154 } 155 /* NOTREACHED */ 156 } 157