1 /* $OpenBSD: from.c,v 1.13 2007/02/20 13:52:22 jmc 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 1.13 2007/02/20 13:52:22 jmc 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, 85 "usage: from [-f file] [-s sender] [user]\n"); 86 exit(1); 87 } 88 argv += optind; 89 90 /* 91 * We find the mailbox by: 92 * 1 -f flag 93 * 2 user 94 * 2 MAIL environment variable 95 * 3 _PATH_MAILDIR/file 96 */ 97 if (!file) { 98 if (!(file = *argv)) { 99 if (!(file = getenv("MAIL"))) { 100 if (!(pwd = getpwuid(getuid()))) 101 errx(1, "no password file entry for you"); 102 if ((file = getenv("USER"))) { 103 (void)snprintf(buf, sizeof(buf), 104 "%s/%s", _PATH_MAILDIR, file); 105 file = buf; 106 } else 107 (void)snprintf(file = buf, sizeof(buf), 108 "%s/%s", _PATH_MAILDIR, 109 pwd->pw_name); 110 } 111 } else { 112 (void)snprintf(buf, sizeof(buf), "%s/%s", 113 _PATH_MAILDIR, file); 114 file = buf; 115 } 116 } 117 if (!freopen(file, "r", stdin)) 118 err(1, "%s", file); 119 for (newline = 1; fgets(buf, sizeof(buf), stdin);) { 120 if (*buf == '\n') { 121 newline = 1; 122 continue; 123 } 124 if (newline && !strncmp(buf, "From ", 5) && 125 (!sender || match(buf + 5, sender))) 126 printf("%s", buf); 127 newline = 0; 128 } 129 exit(0); 130 } 131 132 int 133 match(char *line, char *sender) 134 { 135 char ch, pch, first, *p, *t; 136 137 for (first = *sender++;;) { 138 if (isspace(ch = *line)) 139 return(0); 140 ++line; 141 if (isupper(ch)) 142 ch = tolower(ch); 143 if (ch != first) 144 continue; 145 for (p = sender, t = line;;) { 146 if (!(pch = *p++)) 147 return(1); 148 if (isupper(ch = *t++)) 149 ch = tolower(ch); 150 if (ch != pch) 151 break; 152 } 153 } 154 /* NOTREACHED */ 155 } 156