1 /* $NetBSD: from.c,v 1.14 2001/11/15 14:16:11 kleink Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1980, 1988, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93"; 45 #endif 46 __RCSID("$NetBSD: from.c,v 1.14 2001/11/15 14:16:11 kleink Exp $"); 47 #endif /* not lint */ 48 49 #include <sys/types.h> 50 #include <ctype.h> 51 #include <err.h> 52 #include <paths.h> 53 #include <pwd.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 59 int main (int, char **); 60 int match (const char *, const char *); 61 62 int 63 main(int argc, char **argv) 64 { 65 struct passwd *pwd; 66 int ch, newline; 67 char *file, *sender, *p; 68 #if MAXPATHLEN > BUFSIZ 69 char buf[MAXPATHLEN]; 70 #else 71 char buf[BUFSIZ]; 72 #endif 73 74 file = sender = NULL; 75 while ((ch = getopt(argc, argv, "f:s:")) != -1) 76 switch((char)ch) { 77 case 'f': 78 file = optarg; 79 break; 80 case 's': 81 sender = optarg; 82 for (p = sender; *p; ++p) 83 if (isupper((unsigned char)*p)) 84 *p = tolower(*p); 85 break; 86 default: 87 fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n"); 88 exit(1); 89 } 90 argv += optind; 91 92 /* 93 * We find the mailbox by: 94 * 1 -f flag 95 * 2 user 96 * 2 MAIL environment variable 97 * 3 _PATH_MAILDIR/file 98 */ 99 if (!file) { 100 if (!(file = *argv)) { 101 if (!(file = getenv("MAIL"))) { 102 if (!(pwd = getpwuid(getuid()))) 103 errx(1, "no password file entry for you"); 104 if ((file = getenv("LOGNAME")) != NULL || 105 (file = getenv("USER")) != NULL) { 106 (void)snprintf(buf, sizeof(buf), 107 "%s/%s", _PATH_MAILDIR, file); 108 file = buf; 109 } else 110 (void)snprintf(file = buf, sizeof(buf), 111 "%s/%s", 112 _PATH_MAILDIR, pwd->pw_name); 113 } 114 } else { 115 (void)snprintf(buf, sizeof(buf), "%s/%s", 116 _PATH_MAILDIR, file); 117 file = buf; 118 } 119 } 120 if (!freopen(file, "r", stdin)) 121 err(1, "can't read %s", file); 122 123 for (newline = 1; fgets(buf, sizeof(buf), stdin);) { 124 if (*buf == '\n') { 125 newline = 1; 126 continue; 127 } 128 if (newline && !strncmp(buf, "From ", 5) && 129 (!sender || match(buf + 5, sender))) 130 printf("%s", buf); 131 newline = 0; 132 } 133 exit(0); 134 } 135 136 int 137 match(const char *line, const char *sender) 138 { 139 char ch, pch, first; 140 const char *p, *t; 141 142 for (first = *sender++;;) { 143 if (isspace((unsigned char)(ch = *line))) 144 return(0); 145 ++line; 146 if (isupper((unsigned char)ch)) 147 ch = tolower(ch); 148 if (ch != first) 149 continue; 150 for (p = sender, t = line;;) { 151 if (!(pch = *p++)) 152 return(1); 153 if (isupper((unsigned char)(ch = *t++))) 154 ch = tolower(ch); 155 if (ch != pch) 156 break; 157 } 158 } 159 /* NOTREACHED */ 160 } 161