NetBSD/libexec/mail.local/mail.local.c

321 lines
7.8 KiB
C

/*-
* Copyright (c) 1990 The Regents of the University of California.
* 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 acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
/*static char sccsid[] = "from: @(#)mail.local.c 5.6 (Berkeley) 6/19/91";*/
static char rcsid[] = "$Id: mail.local.c,v 1.8 1994/08/05 23:41:15 jtc Exp $";
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <syslog.h>
#include <fcntl.h>
#include <netdb.h>
#include <pwd.h>
#include <time.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "pathnames.h"
#define FATAL 1
#define NOTFATAL 0
int deliver __P((int, char *, int));
void err __P((int, const char *, ...));
void notifybiff __P((char *));
int store __P((char *));
void usage __P((void));
main(argc, argv)
int argc;
char **argv;
{
extern int optind;
extern char *optarg;
struct passwd *pw;
int ch, fd, eval, lockfile=0;
uid_t uid;
char *from;
openlog("mail.local", LOG_PERROR, LOG_MAIL);
from = NULL;
while ((ch = getopt(argc, argv, "ldf:r:")) != EOF)
switch(ch) {
case 'd': /* backward compatible */
break;
case 'f':
case 'r': /* backward compatible */
if (from)
err(FATAL, "multiple -f options");
from = optarg;
break;
case 'l':
lockfile++;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (!*argv)
usage();
/*
* If from not specified, use the name from getlogin() if the
* uid matches, otherwise, use the name from the password file
* corresponding to the uid.
*/
uid = getuid();
if (!from && (!(from = getlogin()) ||
!(pw = getpwnam(from)) || pw->pw_uid != uid))
from = (pw = getpwuid(uid)) ? pw->pw_name : "???";
fd = store(from);
for (eval = 0; *argv; ++argv)
eval |= deliver(fd, *argv, lockfile);
exit(eval);
}
store(from)
char *from;
{
FILE *fp;
time_t tval;
int fd, eline;
char *tn, line[2048];
tn = strdup(_PATH_LOCTMP);
if ((fd = mkstemp(tn)) == -1 || !(fp = fdopen(fd, "w+")))
err(FATAL, "unable to open temporary file");
(void)unlink(tn);
free(tn);
(void)time(&tval);
(void)fprintf(fp, "From %s %s", from, ctime(&tval));
line[0] = '\0';
for (eline = 1; fgets(line, sizeof(line), stdin);) {
if (line[0] == '\n')
eline = 1;
else {
if (eline && line[0] == 'F' && !bcmp(line, "From ", 5))
(void)putc('>', fp);
eline = 0;
}
(void)fprintf(fp, "%s", line);
if (ferror(fp))
break;
}
/* If message not newline terminated, need an extra. */
if (!index(line, '\n'))
(void)putc('\n', fp);
/* Output a newline; note, empty messages are allowed. */
(void)putc('\n', fp);
(void)fflush(fp);
if (ferror(fp))
err(FATAL, "temporary file write error");
return(fd);
}
deliver(fd, name, lockfile)
int fd;
char *name;
int lockfile;
{
struct stat sb;
struct passwd *pw;
int created, mbfd, nr, nw, off, rval=0, lfd=-1;
char biffmsg[100], buf[8*1024], path[MAXPATHLEN], lpath[MAXPATHLEN];
off_t curoff;
/*
* Disallow delivery to unknown names -- special mailboxes can be
* handled in the sendmail aliases file.
*/
if (!(pw = getpwnam(name))) {
err(NOTFATAL, "unknown name: %s", name);
return(1);
}
(void)sprintf(path, "%s/%s", _PATH_MAILDIR, name);
if(lockfile) {
(void)sprintf(lpath, "%s/%s.lock", _PATH_MAILDIR, name);
if((lfd = open(lpath, O_CREAT|O_WRONLY|O_EXCL,
S_IRUSR|S_IWUSR)) < 0) {
err(NOTFATAL, "%s: %s", lpath, strerror(errno));
return(1);
}
}
if (!(created = lstat(path, &sb)) &&
(sb.st_nlink != 1 || S_ISLNK(sb.st_mode))) {
err(NOTFATAL, "%s: linked file", path);
return(1);
}
if((mbfd = open(path, O_APPEND|O_WRONLY|O_EXLOCK,
S_IRUSR|S_IWUSR)) < 0) {
if ((mbfd = open(path, O_APPEND|O_CREAT|O_WRONLY|O_EXLOCK,
S_IRUSR|S_IWUSR)) < 0) {
err(NOTFATAL, "%s: %s", path, strerror(errno));
return(1);
}
}
curoff = lseek(mbfd, 0, SEEK_END);
(void)sprintf(biffmsg, "%s@%qd\n", name, curoff);
if (lseek(fd, 0, SEEK_SET) == (off_t)-1) {
err(FATAL, "temporary file: %s", strerror(errno));
rval = 1;
goto bad;
}
while ((nr = read(fd, buf, sizeof(buf))) > 0)
for (off = 0; off < nr; off += nw)
if ((nw = write(mbfd, buf + off, nr - off)) < 0) {
err(NOTFATAL, "%s: %s", path, strerror(errno));
goto trunc;
}
if (nr < 0) {
err(FATAL, "temporary file: %s", strerror(errno));
trunc: (void)ftruncate(mbfd, curoff);
rval = 1;
}
/*
* Set the owner and group. Historically, binmail repeated this at
* each mail delivery. We no longer do this, assuming that if the
* ownership or permissions were changed there was a reason for doing
* so.
*/
bad:
if(lockfile) {
if(lfd >= 0) {
unlink(lpath);
close(lfd);
}
}
if (created)
(void)fchown(mbfd, pw->pw_uid, pw->pw_gid);
(void)fsync(mbfd); /* Don't wait for update. */
(void)close(mbfd); /* Implicit unlock. */
if (!rval)
notifybiff(biffmsg);
return(rval);
}
void
notifybiff(msg)
char *msg;
{
static struct sockaddr_in addr;
static int f = -1;
struct hostent *hp;
struct servent *sp;
int len;
if (!addr.sin_family) {
/* Be silent if biff service not available. */
if (!(sp = getservbyname("biff", "udp")))
return;
if (!(hp = gethostbyname("localhost"))) {
err(NOTFATAL, "localhost: %s", strerror(errno));
return;
}
addr.sin_family = hp->h_addrtype;
bcopy(hp->h_addr, &addr.sin_addr, hp->h_length);
addr.sin_port = sp->s_port;
}
if (f < 0 && (f = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
err(NOTFATAL, "socket: %s", strerror(errno));
return;
}
len = strlen(msg) + 1;
if (sendto(f, msg, len, 0, (struct sockaddr *)&addr, sizeof(addr))
!= len)
err(NOTFATAL, "sendto biff: %s", strerror(errno));
}
void
usage()
{
err(FATAL, "usage: mail.local [-f from] user ...");
}
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
void
#if __STDC__
err(int isfatal, const char *fmt, ...)
#else
err(isfatal, fmt)
int isfatal;
char *fmt;
va_dcl
#endif
{
va_list ap;
#if __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
vsyslog(LOG_ERR, fmt, ap);
va_end(ap);
if (isfatal)
exit(1);
}