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
|
/* $OpenBSD: mailwrapper.c,v 1.18 2007/11/06 14:39:19 otto Exp $ */
/* $NetBSD: mailwrapper.c,v 1.2 1999/02/20 22:10:07 thorpej Exp $ */
/*
* Copyright (c) 1998
* Perry E. Metzger. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* This product includes software developed for the NetBSD Project
* by Perry E. Metzger.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <err.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <syslog.h>
#include <unistd.h>
#include <util.h>
#define _PATH_MAILERCONF "/etc/mailer.conf"
#define _PATH_DEFAULTMTA "/usr/libexec/sendmail/sendmail"
struct arglist {
size_t argc, maxc;
char **argv;
};
int main(int, char *[], char *[]);
static void initarg(struct arglist *);
static void addarg(struct arglist *, const char *, int);
extern const char *__progname; /* from crt0.o */
static void
initarg(struct arglist *al)
{
al->argc = 0;
al->maxc = 10;
if ((al->argv = calloc(al->maxc, sizeof(char *))) == NULL)
err(1, "malloc");
}
static void
addarg(struct arglist *al, const char *arg, int copy)
{
if (al->argc == al->maxc) {
al->maxc <<= 1;
al->argv = realloc(al->argv, al->maxc * sizeof(char *));
if (al->argv == NULL)
err(1, "realloc");
}
if (copy) {
if ((al->argv[al->argc++] = strdup(arg)) == NULL)
err(1, "strdup");
} else
al->argv[al->argc++] = (char *)arg;
}
int
main(int argc, char *argv[], char *envp[])
{
FILE *config;
char *line, *cp, *from, *to, *ap;
const char *progname;
size_t len, lineno = 0;
struct arglist al;
/* change __progname to mailwrapper so we get sensible error messages */
progname = __progname;
__progname = "mailwrapper";
initarg(&al);
for (len = 0; len < argc; len++)
addarg(&al, argv[len], 0);
if ((config = fopen(_PATH_MAILERCONF, "r")) == NULL) {
addarg(&al, NULL, 0);
openlog(__progname, LOG_PID, LOG_MAIL);
syslog(LOG_INFO, "cannot open %s, using %s as default MTA",
_PATH_MAILERCONF, _PATH_DEFAULTMTA);
closelog();
execve(_PATH_DEFAULTMTA, al.argv, envp);
err(1, "cannot exec %s", _PATH_DEFAULTMTA);
/*NOTREACHED*/
}
for (;;) {
if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) {
if (feof(config))
errx(1, "no mapping in %s", _PATH_MAILERCONF);
err(1, "fparseln");
}
#define WS " \t\n"
cp = line;
cp += strspn(cp, WS);
if (cp[0] == '\0') {
/* empty line */
free(line);
continue;
}
if ((from = strsep(&cp, WS)) == NULL || cp == NULL)
goto parse_error;
cp += strspn(cp, WS);
if ((to = strsep(&cp, WS)) == NULL)
goto parse_error;
if (strcmp(from, progname) == 0) {
for (ap = strsep(&cp, WS); ap != NULL;
ap = strsep(&cp, WS))
if (*ap)
addarg(&al, ap, 0);
break;
}
free(line);
}
(void)fclose(config);
addarg(&al, NULL, 0);
execve(to, al.argv, envp);
err(1, "cannot exec %s", to);
/*NOTREACHED*/
parse_error:
errx(1, "parse error in %s at line %lu",
_PATH_MAILERCONF, (u_long)lineno);
/*NOTREACHED*/
}
|
