1287247a8SAlexander Pyhalov /*	$OpenBSD: mailwrapper.c,v 1.18 2007/11/06 14:39:19 otto Exp $	*/
2287247a8SAlexander Pyhalov /*	$NetBSD: mailwrapper.c,v 1.9 2003/03/09 08:10:43 mjl Exp $	*/
3287247a8SAlexander Pyhalov 
4287247a8SAlexander Pyhalov /*
5287247a8SAlexander Pyhalov  * Copyright (c) 1998
6287247a8SAlexander Pyhalov  * 	Perry E. Metzger.  All rights reserved.
7287247a8SAlexander Pyhalov  *
8287247a8SAlexander Pyhalov  * Redistribution and use in source and binary forms, with or without
9287247a8SAlexander Pyhalov  * modification, are permitted provided that the following conditions
10287247a8SAlexander Pyhalov  * are met:
11287247a8SAlexander Pyhalov  * 1. Redistributions of source code must retain the above copyright
12287247a8SAlexander Pyhalov  *    notice, this list of conditions and the following disclaimer.
13287247a8SAlexander Pyhalov  * 2. Redistributions in binary form must reproduce the above copyright
14287247a8SAlexander Pyhalov  *    notice, this list of conditions and the following disclaimer in the
15287247a8SAlexander Pyhalov  *    documentation and/or other materials provided with the distribution.
16287247a8SAlexander Pyhalov  * 3. All advertising materials mentioning features or use of this software
17287247a8SAlexander Pyhalov  *    must display the following acknowledgment:
18287247a8SAlexander Pyhalov  *	This product includes software developed for the NetBSD Project
19287247a8SAlexander Pyhalov  *	by Perry E. Metzger.
20287247a8SAlexander Pyhalov  * 4. The name of the author may not be used to endorse or promote products
21287247a8SAlexander Pyhalov  *    derived from this software without specific prior written permission.
22287247a8SAlexander Pyhalov  *
23287247a8SAlexander Pyhalov  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24287247a8SAlexander Pyhalov  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25287247a8SAlexander Pyhalov  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26287247a8SAlexander Pyhalov  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27287247a8SAlexander Pyhalov  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28287247a8SAlexander Pyhalov  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29287247a8SAlexander Pyhalov  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30287247a8SAlexander Pyhalov  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31287247a8SAlexander Pyhalov  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32287247a8SAlexander Pyhalov  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33287247a8SAlexander Pyhalov  */
34287247a8SAlexander Pyhalov 
35287247a8SAlexander Pyhalov #include <compat.h>
36287247a8SAlexander Pyhalov #include <err.h>
37287247a8SAlexander Pyhalov #include <stdio.h>
38287247a8SAlexander Pyhalov #include <string.h>
39287247a8SAlexander Pyhalov #include <unistd.h>
40287247a8SAlexander Pyhalov #include <stdlib.h>
41287247a8SAlexander Pyhalov #include <sysexits.h>
42287247a8SAlexander Pyhalov #include <syslog.h>
43287247a8SAlexander Pyhalov #include <limits.h>
44287247a8SAlexander Pyhalov 
45287247a8SAlexander Pyhalov #include "pathnames.h"
46287247a8SAlexander Pyhalov 
47287247a8SAlexander Pyhalov struct arglist {
48287247a8SAlexander Pyhalov 	size_t argc, maxc;
49287247a8SAlexander Pyhalov 	char **argv;
50287247a8SAlexander Pyhalov };
51287247a8SAlexander Pyhalov 
52287247a8SAlexander Pyhalov int main(int, char *[], char *[]);
53287247a8SAlexander Pyhalov 
54287247a8SAlexander Pyhalov static void initarg(struct arglist *);
55287247a8SAlexander Pyhalov static void addarg(struct arglist *, const char *);
56287247a8SAlexander Pyhalov 
57287247a8SAlexander Pyhalov static void
initarg(struct arglist * al)58287247a8SAlexander Pyhalov initarg(struct arglist *al)
59287247a8SAlexander Pyhalov {
60287247a8SAlexander Pyhalov 	al->argc = 0;
61287247a8SAlexander Pyhalov 	al->maxc = 10;
62287247a8SAlexander Pyhalov 	if ((al->argv = calloc(al->maxc, sizeof (char *))) == NULL)
63287247a8SAlexander Pyhalov 		err(EX_TEMPFAIL, "calloc");
64287247a8SAlexander Pyhalov }
65287247a8SAlexander Pyhalov 
66287247a8SAlexander Pyhalov static void
addarg(struct arglist * al,const char * arg)67287247a8SAlexander Pyhalov addarg(struct arglist *al, const char *arg)
68287247a8SAlexander Pyhalov {
69287247a8SAlexander Pyhalov 
70287247a8SAlexander Pyhalov 	if (al->argc == al->maxc) {
71287247a8SAlexander Pyhalov 		al->maxc <<= 1;
72287247a8SAlexander Pyhalov 		al->argv = realloc(al->argv, al->maxc * sizeof (char *));
73287247a8SAlexander Pyhalov 		if (al->argv == NULL)
74287247a8SAlexander Pyhalov 			err(EX_TEMPFAIL, "realloc");
75287247a8SAlexander Pyhalov 	}
76287247a8SAlexander Pyhalov 	if (arg == NULL)
77287247a8SAlexander Pyhalov 		al->argv[al->argc++] = NULL;
78287247a8SAlexander Pyhalov 	else if ((al->argv[al->argc++] = strdup(arg)) == NULL)
79287247a8SAlexander Pyhalov 		err(EX_TEMPFAIL, "strdup");
80287247a8SAlexander Pyhalov }
81287247a8SAlexander Pyhalov 
82287247a8SAlexander Pyhalov int
main(int argc,char * argv[],char * envp[])83287247a8SAlexander Pyhalov main(int argc, char *argv[], char *envp[])
84287247a8SAlexander Pyhalov {
85287247a8SAlexander Pyhalov 	FILE *config;
86287247a8SAlexander Pyhalov 	char *line, *cp, *from, *to, *ap;
87287247a8SAlexander Pyhalov 	char progname[PATH_MAX+1];
88287247a8SAlexander Pyhalov 	const char *name;
89287247a8SAlexander Pyhalov 	size_t len, lineno = 0;
90287247a8SAlexander Pyhalov 	int i;
91287247a8SAlexander Pyhalov 	struct arglist al;
92287247a8SAlexander Pyhalov 
93287247a8SAlexander Pyhalov 	/* change __progname to mailwrapper so we get sensible error messages */
94287247a8SAlexander Pyhalov 	name = getprogname();
95287247a8SAlexander Pyhalov 	if (name) {
96287247a8SAlexander Pyhalov 		strncpy(progname, name, sizeof (progname));
97287247a8SAlexander Pyhalov 	} else {
98287247a8SAlexander Pyhalov 		err(EX_OSERR, "cannot get program name");
99287247a8SAlexander Pyhalov 	}
100287247a8SAlexander Pyhalov 	setprogname("mailwrapper");
101287247a8SAlexander Pyhalov 
102287247a8SAlexander Pyhalov 	initarg(&al);
103287247a8SAlexander Pyhalov 	addarg(&al, argv[0]);
104287247a8SAlexander Pyhalov 
105287247a8SAlexander Pyhalov 	if ((config = fopen(_PATH_MAILERCONF, "r")) == NULL) {
106*53f6595fSSebastian Wiedenroth 		for (i = 1; i < argc; i++)
107*53f6595fSSebastian Wiedenroth 			addarg(&al, argv[i]);
108287247a8SAlexander Pyhalov 		addarg(&al, NULL);
109287247a8SAlexander Pyhalov 		openlog(getprogname(), LOG_PID, LOG_MAIL);
110287247a8SAlexander Pyhalov 		syslog(LOG_INFO, "cannot open %s, using %s as default MTA",
111287247a8SAlexander Pyhalov 		    _PATH_MAILERCONF, _PATH_DEFAULTMTA);
112287247a8SAlexander Pyhalov 		closelog();
113287247a8SAlexander Pyhalov 		execve(_PATH_DEFAULTMTA, al.argv, envp);
114287247a8SAlexander Pyhalov 		err(EX_OSERR, "cannot exec %s", _PATH_DEFAULTMTA);
115287247a8SAlexander Pyhalov 		/*NOTREACHED*/
116287247a8SAlexander Pyhalov 	}
117287247a8SAlexander Pyhalov 
118287247a8SAlexander Pyhalov 	for (;;) {
119287247a8SAlexander Pyhalov 		if ((line = fparseln(config, &len, &lineno, NULL, 0)) == NULL) {
120287247a8SAlexander Pyhalov 			if (feof(config))
121287247a8SAlexander Pyhalov 				errx(EX_CONFIG, "no mapping for %s in %s",
122287247a8SAlexander Pyhalov 				    progname, _PATH_MAILERCONF);
123287247a8SAlexander Pyhalov 			err(EX_CONFIG, "cannot parse line %lu",
124287247a8SAlexander Pyhalov 			    (ulong_t)lineno);
125287247a8SAlexander Pyhalov 		}
126287247a8SAlexander Pyhalov 
127287247a8SAlexander Pyhalov #define	WS	" \t\n"
128287247a8SAlexander Pyhalov 		cp = line;
129287247a8SAlexander Pyhalov 
130287247a8SAlexander Pyhalov 		cp += strspn(cp, WS);
131287247a8SAlexander Pyhalov 		if (cp[0] == '\0') {
132287247a8SAlexander Pyhalov 			/* empty line */
133287247a8SAlexander Pyhalov 			free(line);
134287247a8SAlexander Pyhalov 			continue;
135287247a8SAlexander Pyhalov 		}
136287247a8SAlexander Pyhalov 
137287247a8SAlexander Pyhalov 		if ((from = strsep(&cp, WS)) == NULL || cp == NULL)
138287247a8SAlexander Pyhalov 			goto parse_error;
139287247a8SAlexander Pyhalov 
140287247a8SAlexander Pyhalov 		cp += strspn(cp, WS);
141287247a8SAlexander Pyhalov 
142287247a8SAlexander Pyhalov 		if ((to = strsep(&cp, WS)) == NULL)
143287247a8SAlexander Pyhalov 			goto parse_error;
144287247a8SAlexander Pyhalov 
145287247a8SAlexander Pyhalov 		if (strcmp(from, progname) == 0) {
146287247a8SAlexander Pyhalov 			for (ap = strsep(&cp, WS); ap != NULL;
147287247a8SAlexander Pyhalov 			    ap = strsep(&cp, WS)) {
148287247a8SAlexander Pyhalov 				if (*ap)
149287247a8SAlexander Pyhalov 					addarg(&al, ap);
150287247a8SAlexander Pyhalov 			}
151287247a8SAlexander Pyhalov 			break;
152287247a8SAlexander Pyhalov 		}
153287247a8SAlexander Pyhalov 
154287247a8SAlexander Pyhalov 		free(line);
155287247a8SAlexander Pyhalov 	}
156287247a8SAlexander Pyhalov 
157287247a8SAlexander Pyhalov 	(void) fclose(config);
158287247a8SAlexander Pyhalov 
159287247a8SAlexander Pyhalov 	for (i = 1; i < argc; i++)
160287247a8SAlexander Pyhalov 		addarg(&al, argv[i]);
161287247a8SAlexander Pyhalov 
162287247a8SAlexander Pyhalov 	addarg(&al, NULL);
163287247a8SAlexander Pyhalov 	execve(to, al.argv, envp);
164287247a8SAlexander Pyhalov 	err(EX_OSERR, "cannot exec %s", to);
165287247a8SAlexander Pyhalov 	/*NOTREACHED*/
166287247a8SAlexander Pyhalov parse_error:
167287247a8SAlexander Pyhalov 	errx(EX_CONFIG, "parse error in %s at line %lu",
168287247a8SAlexander Pyhalov 	    _PATH_MAILERCONF, (ulong_t)lineno);
169287247a8SAlexander Pyhalov 	/*NOTREACHED*/
170287247a8SAlexander Pyhalov 	return (0);
171287247a8SAlexander Pyhalov }
172