Remove __P macros from src/usr.bin and src/usr.sbin.
[dragonfly.git] / usr.sbin / mailwrapper / mailwrapper.c
CommitLineData
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1/* $OpenBSD: mailwrapper.c,v 1.6 1999/12/17 05:06:28 mickey Exp $ */
2/* $NetBSD: mailwrapper.c,v 1.3 1999/05/29 18:18:15 christos Exp $ */
3/* $FreeBSD: src/usr.sbin/mailwrapper/mailwrapper.c,v 1.4.2.3 2001/10/01 12:52:47 dd Exp $ */
2d8a3be7 4/* $DragonFly: src/usr.sbin/mailwrapper/mailwrapper.c,v 1.3 2003/11/03 19:31:38 eirikn Exp $ */
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5
6/*
7 * Copyright (c) 1998
8 * Perry E. Metzger. All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgment:
20 * This product includes software developed for the NetBSD Project
21 * by Perry E. Metzger.
22 * 4. The name of the author may not be used to endorse or promote products
23 * derived from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
30 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
31 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
32 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
33 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
34 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <err.h>
38#include <stdio.h>
39#include <string.h>
40#include <stdlib.h>
41#include <unistd.h>
42#include <libutil.h>
43#include <syslog.h>
44#include <stdarg.h>
45
46#include "pathnames.h"
47
48struct arglist {
49 size_t argc, maxc;
50 char **argv;
51};
52
2d8a3be7 53int main(int, char *[], char *[]);
984263bc 54
2d8a3be7
EN
55static void initarg(struct arglist *);
56static void addarg(struct arglist *, const char *, int);
57static void freearg(struct arglist *, int);
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58
59extern const char *__progname; /* from crt0.o */
60
61static void
62initarg(al)
63 struct arglist *al;
64{
65 al->argc = 0;
66 al->maxc = 10;
67 if ((al->argv = malloc(al->maxc * sizeof(char *))) == NULL)
68 err(1, NULL);
69}
70
71static void
72addarg(al, arg, copy)
73 struct arglist *al;
74 const char *arg;
75 int copy;
76{
77 char **argv2;
78
79 if (al->argc == al->maxc) {
80 al->maxc <<= 1;
81
82 if ((argv2 = realloc(al->argv,
83 al->maxc * sizeof(char *))) == NULL) {
84 if (al->argv)
85 free(al->argv);
86 al->argv = NULL;
87 err(1, NULL);
88 } else {
89 al->argv = argv2;
90 }
91 }
92 if (copy) {
93 if ((al->argv[al->argc++] = strdup(arg)) == NULL)
94 err(1, NULL);
95 } else
96 al->argv[al->argc++] = (char *)arg;
97}
98
99static void
100freearg(al, copy)
101 struct arglist *al;
102 int copy;
103{
104 size_t i;
105 if (copy)
106 for (i = 0; i < al->argc; i++)
107 free(al->argv[i]);
108 free(al->argv);
109}
110
111int
112main(argc, argv, envp)
113 int argc;
114 char *argv[];
115 char *envp[];
116{
117 FILE *config;
118 char *line, *cp, *from, *to, *ap;
119 size_t len, lineno = 0;
120 struct arglist al;
121
122 initarg(&al);
123 for (len = 0; len < argc; len++)
124 addarg(&al, argv[len], 0);
125
126 if ((config = fopen(_PATH_MAILERCONF, "r")) == NULL) {
127 addarg(&al, NULL, 0);
128 openlog("mailwrapper", LOG_PID, LOG_MAIL);
129 syslog(LOG_INFO, "can't open %s, using %s as default MTA",
130 _PATH_MAILERCONF, _PATH_DEFAULTMTA);
131 closelog();
132 execve(_PATH_DEFAULTMTA, al.argv, envp);
133 freearg(&al, 0);
134 err(1, "execing %s", _PATH_DEFAULTMTA);
135 /*NOTREACHED*/
136 }
137
138 for (;;) {
139 if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) {
140 if (feof(config))
141 errx(1, "no mapping in %s", _PATH_MAILERCONF);
142 err(1, "can't parse line %lu", (u_long)lineno);
143 }
144
145#define WS " \t\n"
146 cp = line;
147
148 cp += strspn(cp, WS);
149 if (cp[0] == '\0') {
150 /* empty line */
151 free(line);
152 continue;
153 }
154
155 if ((from = strsep(&cp, WS)) == NULL)
156 goto parse_error;
157
158 cp += strspn(cp, WS);
159
160 if ((to = strsep(&cp, WS)) == NULL)
161 goto parse_error;
162
163 if (strcmp(from, __progname) == 0) {
164 for (ap = strsep(&cp, WS); ap != NULL;
165 ap = strsep(&cp, WS))
166 if (*ap)
167 addarg(&al, ap, 0);
168 break;
169 }
170
171 free(line);
172 }
173
174 (void)fclose(config);
175
176 addarg(&al, NULL, 0);
177 execve(to, al.argv, envp);
178 freearg(&al, 0);
179 warn("execing %s", to);
180 free(line);
181 exit(1);
182 /*NOTREACHED*/
183parse_error:
184 freearg(&al, 0);
185 free(line);
186 errx(1, "parse error in %s at line %lu",
187 _PATH_MAILERCONF, (u_long)lineno);
188 /*NOTREACHED*/
189}