1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/* $Id: nmail-async.c 23 2003-06-04 22:04:34Z lennart $ */
/***
This file is part of libnewmail
libnewmail is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
libnewmail is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with libnewmail; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA
***/
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <limits.h>
#include <string.h>
#include <stdlib.h>
#include <newmail.h>
/* The default Unix mail spool emulation file to use */
#define HACKFILE ".newmail.hack"
/* Create a mail spool file with a size > 0, mtime > atime. */
int create_new(const char *fname) {
int fd = -1, r = 1;
char c = 'X';
if ((fd = open(fname, O_WRONLY|O_CREAT, 0666)) < 0) {
fprintf(stderr, "open(\"%s\", ...): %s\n", fname, strerror(errno));
goto finish;
}
if (write(fd, &c, sizeof(c)) != sizeof(c)) {
fprintf(stderr, "write(): %s\n", strerror(errno));
goto finish;
}
ftruncate(fd, 1);
r = 0;
finish:
if (fd >= 0)
close(fd);
return r;
}
/* Create a mail spool file with a size > 0, mtime < atime. */
int create_old(const char *fname) {
int r = 1, fd = -1;
char c = 'X';
ssize_t n;
if ((fd = open(fname, O_RDWR|O_CREAT, 0666)) < 0) {
fprintf(stderr, "open(\"%s\", ...): %s\n", fname, strerror(errno));
goto finish;
}
do {
if (lseek(fd, 0, SEEK_SET) != 0) {
fprintf(stderr, "lseek(): %s\n", strerror(errno));
goto finish;
}
if ((n = read(fd, &c, sizeof(c))) < 0) {
fprintf(stderr, "read(): %s\n", strerror(errno));
goto finish;
}
if (!n) {
if (write(fd, &c, sizeof(c)) != sizeof(c)) {
fprintf(stderr, "write(): %s\n", strerror(errno));
goto finish;
}
}
} while (!n);
r = 0;
finish:
if (fd >= 0)
close(fd);
return r;
}
/* Create a mail spool file with size == 0. */
int create_empty(const char *fname) {
int fd = -1, r = 1;
if ((fd = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0) {
fprintf(stderr, "open(\"%s\", ...): %s\n", fname, strerror(errno));
goto finish;
}
r = 0;
finish:
if (fd >= 0)
close(fd);
return r;
}
/* Show usage information */
void usage(const char *argv0) {
const char *r;
if ((r = strrchr(argv0, '/')))
r++;
else
r = argv0;
printf("%s [-s SPOOLNAME ] [-f HACKFILE]\n\n"
" SPOOLNAME: The libnewmail spool name to check\n"
" HACKFILE: The emulated Unix mail spool file to use, defaults to $HOME/"HACKFILE"\n\n"
"%s multiplexes the Unix mail spool stat() behaviour for remote mail spools.\n"
"This may be used to teach simple mail check applets new mail spool techniques without patching.\n", r, r);
exit(1);
}
int main(int argc, char *argv[]) {
struct nm_spool *s = NULL;
struct nm_status st;
int r = 1;
char *n = NULL,
*fname = NULL;
char t[PATH_MAX];
/* Iterate through the arguments passed to the process */
for (;;) {
int c;
if ((c = getopt(argc, argv, "s:f:h")) == -1)
break;
switch (c) {
case 's':
n = optarg;
break;
case 'f':
fname = optarg;
break;
default:
usage(argv[0]);
}
}
if (!fname)
snprintf(fname = t, sizeof(t), "%s/"HACKFILE, getenv("HOME"));
/* Open the mail spool */
if (!(s = nm_open(n))) {
fprintf(stderr, "nm_open(\"%s\"): %s\n", n, nm_strerror(nm_errno, errno, nm_explanation));
goto finish;
}
/* Issue the query */
if (nm_query(s, NM_QUERY_CUR|NM_QUERY_NEW, &st) < 0) {
fprintf(stderr, "nm_check(\"%s\"): %s\n", n, nm_strerror(nm_errno, errno, nm_explanation));
goto finish;
}
/* Create the mail spool file accordingly */
if (st.cur && st.new)
r = create_new(fname);
else if (st.cur)
r = create_old(fname);
else
r = create_empty(fname);
finish:
/* Close the mail spool */
if (s)
nm_close(s);
return r;
}
|
