1*1d4c0ebeSThomas Cort /* $NetBSD: from.c,v 1.17 2008/07/21 14:19:22 lukem Exp $ */
2*1d4c0ebeSThomas Cort
3*1d4c0ebeSThomas Cort /*
4*1d4c0ebeSThomas Cort * Copyright (c) 1980, 1988, 1993
5*1d4c0ebeSThomas Cort * The Regents of the University of California. All rights reserved.
6*1d4c0ebeSThomas Cort *
7*1d4c0ebeSThomas Cort * Redistribution and use in source and binary forms, with or without
8*1d4c0ebeSThomas Cort * modification, are permitted provided that the following conditions
9*1d4c0ebeSThomas Cort * are met:
10*1d4c0ebeSThomas Cort * 1. Redistributions of source code must retain the above copyright
11*1d4c0ebeSThomas Cort * notice, this list of conditions and the following disclaimer.
12*1d4c0ebeSThomas Cort * 2. Redistributions in binary form must reproduce the above copyright
13*1d4c0ebeSThomas Cort * notice, this list of conditions and the following disclaimer in the
14*1d4c0ebeSThomas Cort * documentation and/or other materials provided with the distribution.
15*1d4c0ebeSThomas Cort * 3. Neither the name of the University nor the names of its contributors
16*1d4c0ebeSThomas Cort * may be used to endorse or promote products derived from this software
17*1d4c0ebeSThomas Cort * without specific prior written permission.
18*1d4c0ebeSThomas Cort *
19*1d4c0ebeSThomas Cort * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20*1d4c0ebeSThomas Cort * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21*1d4c0ebeSThomas Cort * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22*1d4c0ebeSThomas Cort * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23*1d4c0ebeSThomas Cort * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24*1d4c0ebeSThomas Cort * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25*1d4c0ebeSThomas Cort * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26*1d4c0ebeSThomas Cort * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27*1d4c0ebeSThomas Cort * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28*1d4c0ebeSThomas Cort * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29*1d4c0ebeSThomas Cort * SUCH DAMAGE.
30*1d4c0ebeSThomas Cort */
31*1d4c0ebeSThomas Cort
32*1d4c0ebeSThomas Cort #include <sys/cdefs.h>
33*1d4c0ebeSThomas Cort #ifndef lint
34*1d4c0ebeSThomas Cort __COPYRIGHT("@(#) Copyright (c) 1980, 1988, 1993\
35*1d4c0ebeSThomas Cort The Regents of the University of California. All rights reserved.");
36*1d4c0ebeSThomas Cort #endif /* not lint */
37*1d4c0ebeSThomas Cort
38*1d4c0ebeSThomas Cort #ifndef lint
39*1d4c0ebeSThomas Cort #if 0
40*1d4c0ebeSThomas Cort static char sccsid[] = "@(#)from.c 8.1 (Berkeley) 6/6/93";
41*1d4c0ebeSThomas Cort #endif
42*1d4c0ebeSThomas Cort __RCSID("$NetBSD: from.c,v 1.17 2008/07/21 14:19:22 lukem Exp $");
43*1d4c0ebeSThomas Cort #endif /* not lint */
44*1d4c0ebeSThomas Cort
45*1d4c0ebeSThomas Cort #include <sys/types.h>
46*1d4c0ebeSThomas Cort #include <ctype.h>
47*1d4c0ebeSThomas Cort #include <err.h>
48*1d4c0ebeSThomas Cort #include <paths.h>
49*1d4c0ebeSThomas Cort #include <pwd.h>
50*1d4c0ebeSThomas Cort #include <stdio.h>
51*1d4c0ebeSThomas Cort #include <stdlib.h>
52*1d4c0ebeSThomas Cort #include <string.h>
53*1d4c0ebeSThomas Cort #include <unistd.h>
54*1d4c0ebeSThomas Cort
55*1d4c0ebeSThomas Cort int main (int, char **);
56*1d4c0ebeSThomas Cort int match (const char *, const char *);
57*1d4c0ebeSThomas Cort
58*1d4c0ebeSThomas Cort int
main(int argc,char ** argv)59*1d4c0ebeSThomas Cort main(int argc, char **argv)
60*1d4c0ebeSThomas Cort {
61*1d4c0ebeSThomas Cort struct passwd *pwd;
62*1d4c0ebeSThomas Cort int ch, newline;
63*1d4c0ebeSThomas Cort char *file, *sender, *p;
64*1d4c0ebeSThomas Cort #if MAXPATHLEN > BUFSIZ
65*1d4c0ebeSThomas Cort char buf[MAXPATHLEN];
66*1d4c0ebeSThomas Cort #else
67*1d4c0ebeSThomas Cort char buf[BUFSIZ];
68*1d4c0ebeSThomas Cort #endif
69*1d4c0ebeSThomas Cort
70*1d4c0ebeSThomas Cort file = sender = NULL;
71*1d4c0ebeSThomas Cort while ((ch = getopt(argc, argv, "f:s:")) != -1)
72*1d4c0ebeSThomas Cort switch((char)ch) {
73*1d4c0ebeSThomas Cort case 'f':
74*1d4c0ebeSThomas Cort file = optarg;
75*1d4c0ebeSThomas Cort break;
76*1d4c0ebeSThomas Cort case 's':
77*1d4c0ebeSThomas Cort sender = optarg;
78*1d4c0ebeSThomas Cort for (p = sender; *p; ++p)
79*1d4c0ebeSThomas Cort *p = tolower((unsigned char)*p);
80*1d4c0ebeSThomas Cort break;
81*1d4c0ebeSThomas Cort default:
82*1d4c0ebeSThomas Cort fprintf(stderr, "usage: from [-f file] [-s sender] [user]\n");
83*1d4c0ebeSThomas Cort exit(1);
84*1d4c0ebeSThomas Cort }
85*1d4c0ebeSThomas Cort argv += optind;
86*1d4c0ebeSThomas Cort
87*1d4c0ebeSThomas Cort /*
88*1d4c0ebeSThomas Cort * We find the mailbox by:
89*1d4c0ebeSThomas Cort * 1 -f flag
90*1d4c0ebeSThomas Cort * 2 user
91*1d4c0ebeSThomas Cort * 2 MAIL environment variable
92*1d4c0ebeSThomas Cort * 3 _PATH_MAILDIR/file
93*1d4c0ebeSThomas Cort */
94*1d4c0ebeSThomas Cort if (!file) {
95*1d4c0ebeSThomas Cort if (!(file = *argv)) {
96*1d4c0ebeSThomas Cort if (!(file = getenv("MAIL"))) {
97*1d4c0ebeSThomas Cort if (!(pwd = getpwuid(getuid())))
98*1d4c0ebeSThomas Cort errx(1, "no password file entry for you");
99*1d4c0ebeSThomas Cort if ((file = getenv("LOGNAME")) != NULL ||
100*1d4c0ebeSThomas Cort (file = getenv("USER")) != NULL) {
101*1d4c0ebeSThomas Cort (void)snprintf(buf, sizeof(buf),
102*1d4c0ebeSThomas Cort "%s/%s", _PATH_MAILDIR, file);
103*1d4c0ebeSThomas Cort file = buf;
104*1d4c0ebeSThomas Cort } else
105*1d4c0ebeSThomas Cort (void)snprintf(file = buf, sizeof(buf),
106*1d4c0ebeSThomas Cort "%s/%s",
107*1d4c0ebeSThomas Cort _PATH_MAILDIR, pwd->pw_name);
108*1d4c0ebeSThomas Cort }
109*1d4c0ebeSThomas Cort } else {
110*1d4c0ebeSThomas Cort (void)snprintf(buf, sizeof(buf), "%s/%s",
111*1d4c0ebeSThomas Cort _PATH_MAILDIR, file);
112*1d4c0ebeSThomas Cort file = buf;
113*1d4c0ebeSThomas Cort }
114*1d4c0ebeSThomas Cort }
115*1d4c0ebeSThomas Cort if (!freopen(file, "r", stdin))
116*1d4c0ebeSThomas Cort err(1, "can't read %s", file);
117*1d4c0ebeSThomas Cort
118*1d4c0ebeSThomas Cort for (newline = 1; fgets(buf, sizeof(buf), stdin);) {
119*1d4c0ebeSThomas Cort if (*buf == '\n') {
120*1d4c0ebeSThomas Cort newline = 1;
121*1d4c0ebeSThomas Cort continue;
122*1d4c0ebeSThomas Cort }
123*1d4c0ebeSThomas Cort if (newline && !strncmp(buf, "From ", 5) &&
124*1d4c0ebeSThomas Cort (!sender || match(buf + 5, sender)))
125*1d4c0ebeSThomas Cort printf("%s", buf);
126*1d4c0ebeSThomas Cort newline = 0;
127*1d4c0ebeSThomas Cort }
128*1d4c0ebeSThomas Cort exit(0);
129*1d4c0ebeSThomas Cort }
130*1d4c0ebeSThomas Cort
131*1d4c0ebeSThomas Cort int
match(const char * line,const char * sender)132*1d4c0ebeSThomas Cort match(const char *line, const char *sender)
133*1d4c0ebeSThomas Cort {
134*1d4c0ebeSThomas Cort char ch, pch, first;
135*1d4c0ebeSThomas Cort const char *p, *t;
136*1d4c0ebeSThomas Cort
137*1d4c0ebeSThomas Cort for (first = *sender++;;) {
138*1d4c0ebeSThomas Cort if (isspace((unsigned char)(ch = *line)))
139*1d4c0ebeSThomas Cort return(0);
140*1d4c0ebeSThomas Cort ++line;
141*1d4c0ebeSThomas Cort ch = tolower((unsigned char)ch);
142*1d4c0ebeSThomas Cort if (ch != first)
143*1d4c0ebeSThomas Cort continue;
144*1d4c0ebeSThomas Cort for (p = sender, t = line;;) {
145*1d4c0ebeSThomas Cort if (!(pch = *p++))
146*1d4c0ebeSThomas Cort return(1);
147*1d4c0ebeSThomas Cort ch = tolower((unsigned char)*t++);
148*1d4c0ebeSThomas Cort if (ch != pch)
149*1d4c0ebeSThomas Cort break;
150*1d4c0ebeSThomas Cort }
151*1d4c0ebeSThomas Cort }
152*1d4c0ebeSThomas Cort /* NOTREACHED */
153*1d4c0ebeSThomas Cort }
154