512 lines
12 KiB
C
512 lines
12 KiB
C
|
/*-
|
||
|
|
* Copyright (c) 1990, 1993, 1994
|
||
|
|
* 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
|
||
|
|
static char copyright[] =
|
||
|
|
"@(#) Copyright (c) 1990, 1993, 1994\n\
|
||
|
|
The Regents of the University of California. All rights reserved.\n";
|
||
|
|
#endif /* not lint */
|
||
|
|
|
||
|
|
#ifndef lint
|
||
|
|
static char sccsid[] = "@(#)mail.local.c 8.6 (Berkeley) 4/8/94";
|
||
|
|
#endif /* not lint */
|
||
|
|
|
||
|
|
#include <sys/param.h>
|
||
|
|
#include <sys/stat.h>
|
||
|
|
#include <sys/socket.h>
|
||
|
|
|
||
|
|
#include <netinet/in.h>
|
||
|
|
|
||
|
|
#include <errno.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <netdb.h>
|
||
|
|
#include <pwd.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <sysexits.h>
|
||
|
|
#include <syslog.h>
|
||
|
|
#include <time.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
#if __STDC__
|
||
|
|
#include <stdarg.h>
|
||
|
|
#else
|
||
|
|
#include <varargs.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include "pathnames.h"
|
||
|
|
|
||
|
|
int eval = EX_OK; /* sysexits.h error value. */
|
||
|
|
|
||
|
|
void deliver __P((int, char *));
|
||
|
|
void e_to_sys __P((int));
|
||
|
|
__dead void err __P((const char *, ...));
|
||
|
|
void notifybiff __P((char *));
|
||
|
|
int store __P((char *));
|
||
|
|
void usage __P((void));
|
||
|
|
void vwarn __P((const char *, _BSD_VA_LIST_));
|
||
|
|
void warn __P((const char *, ...));
|
||
|
|
|
||
|
|
int
|
||
|
|
main(argc, argv)
|
||
|
|
int argc;
|
||
|
|
char *argv[];
|
||
|
|
{
|
||
|
|
struct passwd *pw;
|
||
|
|
int ch, fd;
|
||
|
|
uid_t uid;
|
||
|
|
char *from;
|
||
|
|
|
||
|
|
openlog("mail.local", 0, LOG_MAIL);
|
||
|
|
|
||
|
|
from = NULL;
|
||
|
|
while ((ch = getopt(argc, argv, "df:r:")) != EOF)
|
||
|
|
switch(ch) {
|
||
|
|
case 'd': /* Backward compatible. */
|
||
|
|
break;
|
||
|
|
case 'f':
|
||
|
|
case 'r': /* Backward compatible. */
|
||
|
|
if (from != NULL) {
|
||
|
|
warn("multiple -f options");
|
||
|
|
usage();
|
||
|
|
}
|
||
|
|
from = optarg;
|
||
|
|
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 : "???";
|
||
|
|
|
||
|
|
/*
|
||
|
|
* There is no way to distinguish the error status of one delivery
|
||
|
|
* from the rest of the deliveries. So, if we failed hard on one
|
||
|
|
* or more deliveries, but had no failures on any of the others, we
|
||
|
|
* return a hard failure. If we failed temporarily on one or more
|
||
|
|
* deliveries, we return a temporary failure regardless of the other
|
||
|
|
* failures. This results in the delivery being reattempted later
|
||
|
|
* at the expense of repeated failures and multiple deliveries.
|
||
|
|
*/
|
||
|
|
for (fd = store(from); *argv; ++argv)
|
||
|
|
deliver(fd, *argv);
|
||
|
|
exit(eval);
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
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+")) == NULL) {
|
||
|
|
e_to_sys(errno);
|
||
|
|
err("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' &&
|
||
|
|
!memcmp(line, "From ", 5))
|
||
|
|
(void)putc('>', fp);
|
||
|
|
eline = 0;
|
||
|
|
}
|
||
|
|
(void)fprintf(fp, "%s", line);
|
||
|
|
if (ferror(fp)) {
|
||
|
|
e_to_sys(errno);
|
||
|
|
err("temporary file write error");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* If message not newline terminated, need an extra. */
|
||
|
|
if (!strchr(line, '\n'))
|
||
|
|
(void)putc('\n', fp);
|
||
|
|
/* Output a newline; note, empty messages are allowed. */
|
||
|
|
(void)putc('\n', fp);
|
||
|
|
|
||
|
|
if (fflush(fp) == EOF || ferror(fp)) {
|
||
|
|
e_to_sys(errno);
|
||
|
|
err("temporary file write error");
|
||
|
|
}
|
||
|
|
return (fd);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
deliver(fd, name)
|
||
|
|
int fd;
|
||
|
|
char *name;
|
||
|
|
{
|
||
|
|
struct stat fsb, sb;
|
||
|
|
struct passwd *pw;
|
||
|
|
int mbfd, nr, nw, off;
|
||
|
|
char biffmsg[100], buf[8*1024], path[MAXPATHLEN];
|
||
|
|
off_t curoff;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Disallow delivery to unknown names -- special mailboxes can be
|
||
|
|
* handled in the sendmail aliases file.
|
||
|
|
*/
|
||
|
|
if (!(pw = getpwnam(name))) {
|
||
|
|
if (eval != EX_TEMPFAIL)
|
||
|
|
eval = EX_UNAVAILABLE;
|
||
|
|
warn("unknown name: %s", name);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
(void)snprintf(path, sizeof(path), "%s/%s", _PATH_MAILDIR, name);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* If the mailbox is linked or a symlink, fail. There's an obvious
|
||
|
|
* race here, that the file was replaced with a symbolic link after
|
||
|
|
* the lstat returned, but before the open. We attempt to detect
|
||
|
|
* this by comparing the original stat information and information
|
||
|
|
* returned by an fstat of the file descriptor returned by the open.
|
||
|
|
*
|
||
|
|
* NB: this is a symptom of a larger problem, that the mail spooling
|
||
|
|
* directory is writeable by the wrong users. If that directory is
|
||
|
|
* writeable, system security is compromised for other reasons, and
|
||
|
|
* it cannot be fixed here.
|
||
|
|
*
|
||
|
|
* If we created the mailbox, set the owner/group. If that fails,
|
||
|
|
* just return. Another process may have already opened it, so we
|
||
|
|
* can't unlink it. Historically, binmail set the owner/group at
|
||
|
|
* each mail delivery. We no longer do this, assuming that if the
|
||
|
|
* ownership or permissions were changed there was a reason.
|
||
|
|
*
|
||
|
|
* XXX
|
||
|
|
* open(2) should support flock'ing the file.
|
||
|
|
*/
|
||
|
|
tryagain:
|
||
|
|
if (lstat(path, &sb)) {
|
||
|
|
mbfd = open(path,
|
||
|
|
O_APPEND|O_CREAT|O_EXCL|O_WRONLY, S_IRUSR|S_IWUSR);
|
||
|
|
if (mbfd == -1) {
|
||
|
|
if (errno == EEXIST)
|
||
|
|
goto tryagain;
|
||
|
|
} else if (fchown(mbfd, pw->pw_uid, pw->pw_gid)) {
|
||
|
|
e_to_sys(errno);
|
||
|
|
warn("chown %u.%u: %s", pw->pw_uid, pw->pw_gid, name);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
} else if (sb.st_nlink != 1 || S_ISLNK(sb.st_mode)) {
|
||
|
|
e_to_sys(errno);
|
||
|
|
warn("%s: linked file", path);
|
||
|
|
return;
|
||
|
|
} else {
|
||
|
|
mbfd = open(path, O_APPEND|O_WRONLY, 0);
|
||
|
|
if (mbfd != -1 &&
|
||
|
|
(fstat(mbfd, &fsb) || fsb.st_nlink != 1 ||
|
||
|
|
S_ISLNK(fsb.st_mode) || sb.st_dev != fsb.st_dev ||
|
||
|
|
sb.st_ino != fsb.st_ino)) {
|
||
|
|
warn("%s: file changed after open", path);
|
||
|
|
(void)close(mbfd);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (mbfd == -1) {
|
||
|
|
e_to_sys(errno);
|
||
|
|
warn("%s: %s", path, strerror(errno));
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Wait until we can get a lock on the file. */
|
||
|
|
if (flock(mbfd, LOCK_EX)) {
|
||
|
|
e_to_sys(errno);
|
||
|
|
warn("%s: %s", path, strerror(errno));
|
||
|
|
goto err1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Get the starting offset of the new message for biff. */
|
||
|
|
curoff = lseek(mbfd, (off_t)0, SEEK_END);
|
||
|
|
(void)snprintf(biffmsg, sizeof(biffmsg), "%s@%qd\n", name, curoff);
|
||
|
|
|
||
|
|
/* Copy the message into the file. */
|
||
|
|
if (lseek(fd, (off_t)0, SEEK_SET) == (off_t)-1) {
|
||
|
|
e_to_sys(errno);
|
||
|
|
warn("temporary file: %s", strerror(errno));
|
||
|
|
goto err1;
|
||
|
|
}
|
||
|
|
while ((nr = read(fd, buf, sizeof(buf))) > 0)
|
||
|
|
for (off = 0; off < nr; nr -= nw, off += nw)
|
||
|
|
if ((nw = write(mbfd, buf + off, nr)) < 0) {
|
||
|
|
e_to_sys(errno);
|
||
|
|
warn("%s: %s", path, strerror(errno));
|
||
|
|
goto err2;;
|
||
|
|
}
|
||
|
|
if (nr < 0) {
|
||
|
|
e_to_sys(errno);
|
||
|
|
warn("temporary file: %s", strerror(errno));
|
||
|
|
goto err2;;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Flush to disk, don't wait for update. */
|
||
|
|
if (fsync(mbfd)) {
|
||
|
|
e_to_sys(errno);
|
||
|
|
warn("%s: %s", path, strerror(errno));
|
||
|
|
err2: (void)ftruncate(mbfd, curoff);
|
||
|
|
err1: (void)close(mbfd);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Close and check -- NFS doesn't write until the close. */
|
||
|
|
if (close(mbfd)) {
|
||
|
|
e_to_sys(errno);
|
||
|
|
warn("%s: %s", path, strerror(errno));
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
notifybiff(biffmsg);
|
||
|
|
}
|
||
|
|
|
||
|
|
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"))) {
|
||
|
|
warn("localhost: %s", strerror(errno));
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
addr.sin_family = hp->h_addrtype;
|
||
|
|
memmove(&addr.sin_addr, hp->h_addr, hp->h_length);
|
||
|
|
addr.sin_port = sp->s_port;
|
||
|
|
}
|
||
|
|
if (f < 0 && (f = socket(AF_INET, SOCK_DGRAM, 0)) == -1) {
|
||
|
|
warn("socket: %s", strerror(errno));
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
len = strlen(msg) + 1;
|
||
|
|
if (sendto(f, msg, len, 0, (struct sockaddr *)&addr, sizeof(addr))
|
||
|
|
!= len)
|
||
|
|
warn("sendto biff: %s", strerror(errno));
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
usage()
|
||
|
|
{
|
||
|
|
eval = EX_USAGE;
|
||
|
|
err("usage: mail.local [-f from] user ...");
|
||
|
|
}
|
||
|
|
|
||
|
|
#if __STDC__
|
||
|
|
void
|
||
|
|
err(const char *fmt, ...)
|
||
|
|
#else
|
||
|
|
void
|
||
|
|
err(fmt, va_alist)
|
||
|
|
const char *fmt;
|
||
|
|
va_dcl
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
va_list ap;
|
||
|
|
|
||
|
|
#if __STDC__
|
||
|
|
va_start(ap, fmt);
|
||
|
|
#else
|
||
|
|
va_start(ap);
|
||
|
|
#endif
|
||
|
|
vwarn(fmt, ap);
|
||
|
|
va_end(ap);
|
||
|
|
|
||
|
|
exit(eval);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
#if __STDC__
|
||
|
|
warn(const char *fmt, ...)
|
||
|
|
#else
|
||
|
|
warn(fmt, va_alist)
|
||
|
|
const char *fmt;
|
||
|
|
va_dcl
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
va_list ap;
|
||
|
|
|
||
|
|
#if __STDC__
|
||
|
|
va_start(ap, fmt);
|
||
|
|
#else
|
||
|
|
va_start(ap);
|
||
|
|
#endif
|
||
|
|
vwarn(fmt, ap);
|
||
|
|
va_end(ap);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
vwarn(fmt, ap)
|
||
|
|
const char *fmt;
|
||
|
|
_BSD_VA_LIST_ ap;
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* Log the message to stderr.
|
||
|
|
*
|
||
|
|
* Don't use LOG_PERROR as an openlog() flag to do this,
|
||
|
|
* it's not portable enough.
|
||
|
|
*/
|
||
|
|
if (eval != EX_USAGE)
|
||
|
|
(void)fprintf(stderr, "mail.local: ");
|
||
|
|
(void)vfprintf(stderr, fmt, ap);
|
||
|
|
(void)fprintf(stderr, "\n");
|
||
|
|
|
||
|
|
/* Log the message to syslog. */
|
||
|
|
vsyslog(LOG_ERR, fmt, ap);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* e_to_sys --
|
||
|
|
* Guess which errno's are temporary. Gag me.
|
||
|
|
*/
|
||
|
|
void
|
||
|
|
e_to_sys(num)
|
||
|
|
int num;
|
||
|
|
{
|
||
|
|
/* Temporary failures override hard errors. */
|
||
|
|
if (eval == EX_TEMPFAIL)
|
||
|
|
return;
|
||
|
|
|
||
|
|
switch(num) { /* Hopefully temporary errors. */
|
||
|
|
#ifdef EAGAIN
|
||
|
|
case EAGAIN: /* Resource temporarily unavailable */
|
||
|
|
#endif
|
||
|
|
#ifdef EDQUOT
|
||
|
|
case EDQUOT: /* Disc quota exceeded */
|
||
|
|
#endif
|
||
|
|
#ifdef EBUSY
|
||
|
|
case EBUSY: /* Device busy */
|
||
|
|
#endif
|
||
|
|
#ifdef EPROCLIM
|
||
|
|
case EPROCLIM: /* Too many processes */
|
||
|
|
#endif
|
||
|
|
#ifdef EUSERS
|
||
|
|
case EUSERS: /* Too many users */
|
||
|
|
#endif
|
||
|
|
#ifdef ECONNABORTED
|
||
|
|
case ECONNABORTED: /* Software caused connection abort */
|
||
|
|
#endif
|
||
|
|
#ifdef ECONNREFUSED
|
||
|
|
case ECONNREFUSED: /* Connection refused */
|
||
|
|
#endif
|
||
|
|
#ifdef ECONNRESET
|
||
|
|
case ECONNRESET: /* Connection reset by peer */
|
||
|
|
#endif
|
||
|
|
#ifdef EDEADLK
|
||
|
|
case EDEADLK: /* Resource deadlock avoided */
|
||
|
|
#endif
|
||
|
|
#ifdef EFBIG
|
||
|
|
case EFBIG: /* File too large */
|
||
|
|
#endif
|
||
|
|
#ifdef EHOSTDOWN
|
||
|
|
case EHOSTDOWN: /* Host is down */
|
||
|
|
#endif
|
||
|
|
#ifdef EHOSTUNREACH
|
||
|
|
case EHOSTUNREACH: /* No route to host */
|
||
|
|
#endif
|
||
|
|
#ifdef EMFILE
|
||
|
|
case EMFILE: /* Too many open files */
|
||
|
|
#endif
|
||
|
|
#ifdef ENETDOWN
|
||
|
|
case ENETDOWN: /* Network is down */
|
||
|
|
#endif
|
||
|
|
#ifdef ENETRESET
|
||
|
|
case ENETRESET: /* Network dropped connection on reset */
|
||
|
|
#endif
|
||
|
|
#ifdef ENETUNREACH
|
||
|
|
case ENETUNREACH: /* Network is unreachable */
|
||
|
|
#endif
|
||
|
|
#ifdef ENFILE
|
||
|
|
case ENFILE: /* Too many open files in system */
|
||
|
|
#endif
|
||
|
|
#ifdef ENOBUFS
|
||
|
|
case ENOBUFS: /* No buffer space available */
|
||
|
|
#endif
|
||
|
|
#ifdef ENOMEM
|
||
|
|
case ENOMEM: /* Cannot allocate memory */
|
||
|
|
#endif
|
||
|
|
#ifdef ENOSPC
|
||
|
|
case ENOSPC: /* No space left on device */
|
||
|
|
#endif
|
||
|
|
#ifdef EROFS
|
||
|
|
case EROFS: /* Read-only file system */
|
||
|
|
#endif
|
||
|
|
#ifdef ESTALE
|
||
|
|
case ESTALE: /* Stale NFS file handle */
|
||
|
|
#endif
|
||
|
|
#ifdef ETIMEDOUT
|
||
|
|
case ETIMEDOUT: /* Connection timed out */
|
||
|
|
#endif
|
||
|
|
#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
|
||
|
|
case EWOULDBLOCK: /* Operation would block. */
|
||
|
|
#endif
|
||
|
|
eval = EX_TEMPFAIL;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
eval = EX_UNAVAILABLE;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|