1 /* $OpenBSD: from.c,v 1.12 2006/03/14 19:39:49 moritz 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 1.12 2006/03/14 19:39:49 moritz 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 struct passwd *pwd; 62 int ch, newline; 63 char *file, *sender, *p; 64 #if MAXPATHLEN > BUFSIZ 65 char buf[MAXPATHLEN]; 66 #else 67 char buf[BUFSIZ]; 68 #endif 69 70 file = sender = NULL; 71 while ((ch = getopt(argc, argv, "f:s:")) != -1) 72 switch((char)ch) { 73 case 'f': 74 file = optarg; 75 break; 76 case 's': 77 sender = optarg; 78 for (p = sender; *p; ++p) 79 if (isupper(*p)) 80 *p = tolower(*p); 81 break; 82 case '?': 83 default: 84 fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n"); 85 exit(1); 86 } 87 argv += optind; 88 89 /* 90 * We find the mailbox by: 91 * 1 -f flag 92 * 2 user 93 * 2 MAIL environment variable 94 * 3 _PATH_MAILDIR/file 95 */ 96 if (!file) { 97 if (!(file = *argv)) { 98 if (!(file = getenv("MAIL"))) { 99 if (!(pwd = getpwuid(getuid()))) 100 errx(1, "no password file entry for you"); 101 if ((file = getenv("USER"))) { 102 (void)snprintf(buf, sizeof(buf), 103 "%s/%s", _PATH_MAILDIR, file); 104 file = buf; 105 } else 106 (void)snprintf(file = buf, sizeof(buf), 107 "%s/%s", _PATH_MAILDIR, 108 pwd->pw_name); 109 } 110 } else { 111 (void)snprintf(buf, sizeof(buf), "%s/%s", 112 _PATH_MAILDIR, file); 113 file = buf; 114 } 115 } 116 if (!freopen(file, "r", stdin)) 117 err(1, "%s", file); 118 for (newline = 1; fgets(buf, sizeof(buf), stdin);) { 119 if (*buf == '\n') { 120 newline = 1; 121 continue; 122 } 123 if (newline && !strncmp(buf, "From ", 5) && 124 (!sender || match(buf + 5, sender))) 125 printf("%s", buf); 126 newline = 0; 127 } 128 exit(0); 129 } 130 131 int 132 match(char *line, char *sender) 133 { 134 char ch, pch, first, *p, *t; 135 136 for (first = *sender++;;) { 137 if (isspace(ch = *line)) 138 return(0); 139 ++line; 140 if (isupper(ch)) 141 ch = tolower(ch); 142 if (ch != first) 143 continue; 144 for (p = sender, t = line;;) { 145 if (!(pch = *p++)) 146 return(1); 147 if (isupper(ch = *t++)) 148 ch = tolower(ch); 149 if (ch != pch) 150 break; 151 } 152 } 153 /* NOTREACHED */ 154 } 155