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mail.local.c revision 1.16.10.1 
      1 /*	$NetBSD: mail.local.c,v 1.16.10.1 2000/10/17 22:41:49 tv Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) Copyright (c) 1990, 1993, 1994\n\
     39 	The Regents of the University of California.  All rights reserved.\n");
     40 #if 0
     41 static char sccsid[] = "@(#)mail.local.c	8.22 (Berkeley) 6/21/95";
     42 #else
     43 __RCSID("$NetBSD: mail.local.c,v 1.16.10.1 2000/10/17 22:41:49 tv Exp $");
     44 #endif
     45 #endif /* not lint */
     46 
     47 #include <sys/param.h>
     48 #include <sys/stat.h>
     49 #include <sys/socket.h>
     50 
     51 #include <netinet/in.h>
     52 
     53 #include <errno.h>
     54 #include <fcntl.h>
     55 #include <pwd.h>
     56 #include <netdb.h>
     57 #include <stdio.h>
     58 #include <stdlib.h>
     59 #include <string.h>
     60 #include <syslog.h>
     61 #include <time.h>
     62 #include <unistd.h>
     63 
     64 #include "pathnames.h"
     65 
     66 #define	FATAL		1
     67 #define	NOTFATAL	0
     68 
     69 int	deliver __P((int, char *, int));
     70 void	err __P((int, const char *, ...))
     71      __attribute__((__format__(__printf__, 2, 3)));
     72 void	notifybiff __P((char *));
     73 int	store __P((const char *));
     74 void	usage __P((void));
     75 int	main __P((int, char **));
     76 
     77 int
     78 main(argc, argv)
     79 	int argc;
     80 	char **argv;
     81 {
     82 	struct passwd *pw;
     83 	int ch, fd, eval, lockfile = 0;
     84 	uid_t uid;
     85 	const char *from;
     86 
     87 	/* use a reasonable umask */
     88 	(void) umask(0077);
     89 
     90 	openlog("mail.local", LOG_PERROR, LOG_MAIL);
     91 
     92 	from = NULL;
     93 	while ((ch = getopt(argc, argv, "ldf:r:")) != -1)
     94 		switch (ch) {
     95 		case 'd':		/* backward compatible */
     96 			break;
     97 		case 'f':
     98 		case 'r':		/* backward compatible */
     99 			if (from)
    100 				err(FATAL, "multiple -f options");
    101 			from = optarg;
    102 			break;
    103 		case 'l':
    104 			lockfile++;
    105 			break;
    106 		case '?':
    107 		default:
    108 			usage();
    109 		}
    110 	argc -= optind;
    111 	argv += optind;
    112 
    113 	if (!*argv)
    114 		usage();
    115 
    116 	/*
    117 	 * If from not specified, use the name from getlogin() if the
    118 	 * uid matches, otherwise, use the name from the password file
    119 	 * corresponding to the uid.
    120 	 */
    121 	uid = getuid();
    122 	if (!from && (!(from = getlogin()) ||
    123 	    !(pw = getpwnam(from)) || pw->pw_uid != uid))
    124 		from = (pw = getpwuid(uid)) ? pw->pw_name : "???";
    125 
    126 	fd = store(from);
    127 	for (eval = 0; *argv; ++argv)
    128 		eval |= deliver(fd, *argv, lockfile);
    129 	exit (eval);
    130 }
    131 
    132 int
    133 store(from)
    134 	const char *from;
    135 {
    136 	FILE *fp = NULL;	/* XXX gcc */
    137 	time_t tval;
    138 	int fd, eline;
    139 	char *tn, line[2048];
    140 
    141 	tn = strdup(_PATH_LOCTMP);
    142 	if ((fd = mkstemp(tn)) == -1 || !(fp = fdopen(fd, "w+")))
    143 		err(FATAL, "unable to open temporary file");
    144 	(void)unlink(tn);
    145 	free(tn);
    146 
    147 	(void)time(&tval);
    148 	(void)fprintf(fp, "From %s %s", from, ctime(&tval));
    149 
    150 	line[0] = '\0';
    151 	for (eline = 1; fgets(line, sizeof(line), stdin);) {
    152 		if (line[0] == '\n')
    153 			eline = 1;
    154 		else {
    155 			if (eline && line[0] == 'F' && !memcmp(line, "From ", 5))
    156 				(void)putc('>', fp);
    157 			eline = 0;
    158 		}
    159 		(void)fprintf(fp, "%s", line);
    160 		if (ferror(fp))
    161 			break;
    162 	}
    163 
    164 	/* If message not newline terminated, need an extra. */
    165 	if (!index(line, '\n'))
    166 		(void)putc('\n', fp);
    167 	/* Output a newline; note, empty messages are allowed. */
    168 	(void)putc('\n', fp);
    169 
    170 	(void)fflush(fp);
    171 	if (ferror(fp))
    172 		err(FATAL, "temporary file write error");
    173 	return(fd);
    174 }
    175 
    176 int
    177 deliver(fd, name, lockfile)
    178 	int fd;
    179 	char *name;
    180 	int lockfile;
    181 {
    182 	struct stat sb;
    183 	struct passwd *pw;
    184 	int created, mbfd, nr, nw, off, rval=0, lfd=-1;
    185 	char biffmsg[100], buf[8*1024], path[MAXPATHLEN], lpath[MAXPATHLEN];
    186 	off_t curoff;
    187 
    188 	/*
    189 	 * Disallow delivery to unknown names -- special mailboxes can be
    190 	 * handled in the sendmail aliases file.
    191 	 */
    192 	if (!(pw = getpwnam(name))) {
    193 		err(NOTFATAL, "unknown name: %s", name);
    194 		return(1);
    195 	}
    196 
    197 	(void)snprintf(path, sizeof path, "%s/%s", _PATH_MAILDIR, name);
    198 
    199 	if (lockfile) {
    200 		(void)snprintf(lpath, sizeof lpath, "%s/%s.lock",
    201 		    _PATH_MAILDIR, name);
    202 
    203 		if((lfd = open(lpath, O_CREAT|O_WRONLY|O_EXCL,
    204 		    S_IRUSR|S_IWUSR)) < 0) {
    205 			err(NOTFATAL, "%s: %s", lpath, strerror(errno));
    206 			return(1);
    207 		}
    208 	}
    209 
    210 	if (!(created = lstat(path, &sb)) &&
    211 	    (sb.st_nlink != 1 || S_ISLNK(sb.st_mode))) {
    212 		err(NOTFATAL, "%s: linked file", path);
    213 		return(1);
    214 	}
    215 	if ((mbfd = open(path, O_APPEND|O_WRONLY|O_EXLOCK,
    216 	    S_IRUSR|S_IWUSR)) < 0) {
    217 		if ((mbfd = open(path, O_APPEND|O_CREAT|O_WRONLY|O_EXLOCK,
    218 		    S_IRUSR|S_IWUSR)) < 0) {
    219 			err(NOTFATAL, "%s: %s", path, strerror(errno));
    220 			return(1);
    221 		}
    222 	}
    223 
    224 	curoff = lseek(mbfd, 0, SEEK_END);
    225 	(void)snprintf(biffmsg, sizeof biffmsg, "%s@%qd\n", name,
    226 	    (long long)curoff);
    227 	if (lseek(fd, 0, SEEK_SET) == (off_t)-1) {
    228 		err(FATAL, "temporary file: %s", strerror(errno));
    229 		rval = 1;
    230 		goto bad;
    231 	}
    232 
    233 	while ((nr = read(fd, buf, sizeof(buf))) > 0)
    234 		for (off = 0; off < nr;  off += nw)
    235 			if ((nw = write(mbfd, buf + off, nr - off)) < 0) {
    236 				err(NOTFATAL, "%s: %s", path, strerror(errno));
    237 				goto trunc;
    238 			}
    239 	if (nr < 0) {
    240 		err(FATAL, "temporary file: %s", strerror(errno));
    241 trunc:		(void)ftruncate(mbfd, curoff);
    242 		rval = 1;
    243 	}
    244 
    245 	/*
    246 	 * Set the owner and group.  Historically, binmail repeated this at
    247 	 * each mail delivery.  We no longer do this, assuming that if the
    248 	 * ownership or permissions were changed there was a reason for doing
    249 	 * so.
    250 	 */
    251 bad:
    252 	if (lockfile) {
    253 		if (lfd >= 0) {
    254 			unlink(lpath);
    255 			close(lfd);
    256 		}
    257 	}
    258 	if (created)
    259 		(void)fchown(mbfd, pw->pw_uid, pw->pw_gid);
    260 
    261 	(void)fsync(mbfd);		/* Don't wait for update. */
    262 	(void)close(mbfd);		/* Implicit unlock. */
    263 
    264 	if (!rval)
    265 		notifybiff(biffmsg);
    266 	return(rval);
    267 }
    268 
    269 void
    270 notifybiff(msg)
    271 	char *msg;
    272 {
    273 	static struct sockaddr_in addr;
    274 	static int f = -1;
    275 	struct hostent *hp;
    276 	struct servent *sp;
    277 	int len;
    278 
    279 	if (!addr.sin_family) {
    280 		/* Be silent if biff service not available. */
    281 		if (!(sp = getservbyname("biff", "udp")))
    282 			return;
    283 		if (!(hp = gethostbyname("localhost"))) {
    284 			err(NOTFATAL, "localhost: %s", strerror(errno));
    285 			return;
    286 		}
    287 		addr.sin_len = sizeof(struct sockaddr_in);
    288 		addr.sin_family = hp->h_addrtype;
    289 		addr.sin_port = sp->s_port;
    290 		memcpy(&addr.sin_addr, hp->h_addr, hp->h_length);
    291 	}
    292 	if (f < 0 && (f = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
    293 		err(NOTFATAL, "socket: %s", strerror(errno));
    294 		return;
    295 	}
    296 	len = strlen(msg) + 1;
    297 	if (sendto(f, msg, len, 0, (struct sockaddr *)&addr, sizeof(addr))
    298 	    != len)
    299 		err(NOTFATAL, "sendto biff: %s", strerror(errno));
    300 }
    301 
    302 void
    303 usage()
    304 {
    305 	err(FATAL, "usage: mail.local [-f from] user ...");
    306 }
    307 
    308 #if __STDC__
    309 #include <stdarg.h>
    310 #else
    311 #include <varargs.h>
    312 #endif
    313 
    314 void
    315 #if __STDC__
    316 err(int isfatal, const char *fmt, ...)
    317 #else
    318 err(isfatal, fmt)
    319 	int isfatal;
    320 	char *fmt;
    321 	va_dcl
    322 #endif
    323 {
    324 	va_list ap;
    325 #if __STDC__
    326 	va_start(ap, fmt);
    327 #else
    328 	va_start(ap);
    329 #endif
    330 	vsyslog(LOG_ERR, fmt, ap);
    331 	va_end(ap);
    332 	if (isfatal)
    333 		exit(1);
    334 }
    335