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deliver.c
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deliver.c
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/* deliver.c -- deliver shell - just calls lmtpd
* Tim Martin
*
* Copyright (c) 2000 Carnegie Mellon University. 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. The name "Carnegie Mellon University" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For permission or any other legal
* details, please contact
* Office of Technology Transfer
* Carnegie Mellon University
* 5000 Forbes Avenue
* Pittsburgh, PA 15213-3890
* (412) 268-4387, fax: (412) 268-7395
* tech-transfer@andrew.cmu.edu
*
* 4. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by Computing Services
* at Carnegie Mellon University (http://www.cmu.edu/computing/)."
*
* CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
* THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
* FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include <config.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <syslog.h>
#include <com_err.h>
#include <errno.h>
#include <pwd.h>
#include <sys/types.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/un.h>
#include "imapconf.h"
#include "exitcodes.h"
#include "imap_err.h"
#include "xmalloc.h"
#include "lmtpengine.h"
#include "prot.h"
#include "version.h"
extern int optind;
extern char *optarg;
static int lmtpdsock;
static int logdebug = 0;
static struct protstream *deliver_out, *deliver_in;
static const char *sockaddr;
/* forward declarations */
static int deliver_msg(char *return_path, char *authuser, int ignorequota,
char **users, int numusers, char *mailbox);
static int init_net(const char *sockaddr);
static void
usage()
{
fprintf(stderr,
"421-4.3.0 usage: deliver [-C <alt_config> ] [-m mailbox]"
" [-a auth] [-r return_path] [-l] [-D]\r\n");
fprintf(stderr, "421 4.3.0 %s\n", CYRUS_VERSION);
exit(EC_USAGE);
}
void fatal(const char* s, int code)
{
prot_printf(deliver_out,"421 4.3.0 deliver: %s\r\n", s);
prot_flush(deliver_out);
exit(code);
}
static int push(int in, int out)
{
char buf[4096];
int len;
int cnt;
int amnt = 0;
len = read(in, buf, sizeof(buf)-1);
if (len == -1) {
exit(EC_IOERR);
}
if (len == 0) {
exit(0);
}
/* keep writing until we have written the whole thing
xxx can cause deadlock??? */
do {
cnt = write(out, buf+amnt,len-amnt);
if (cnt == -1) exit(EC_IOERR);
amnt += cnt;
} while (amnt<len);
return 0;
}
/*
* Here we're just an intermediatory piping stdin to lmtp socket
* and lmtp socket to stdout
*/
void pipe_through(int lmtp_in, int lmtp_out, int local_in, int local_out)
{
int nfound;
int highest = 3;
fd_set read_set, rset;
fd_set write_set, wset;
FD_ZERO(&read_set);
FD_SET(lmtp_in, &read_set);
if (lmtp_in >= highest) highest = lmtp_in+1;
FD_SET(local_in, &read_set);
FD_ZERO(&write_set);
FD_SET(lmtp_out, &write_set);
if (lmtp_out >= highest) highest = lmtp_out+1;
FD_SET(local_out, &write_set);
while (1)
{
rset = read_set;
wset = write_set;
nfound = select(highest, &rset, &wset, NULL, NULL);
if (nfound < 0) {
if (errno == EINTR) continue;
exit(EC_IOERR);
}
if ((FD_ISSET(lmtp_in,&rset)) && (FD_ISSET(local_out,&wset))) {
push(lmtp_in, local_out);
}
if ((FD_ISSET(local_in,&rset)) && (FD_ISSET(lmtp_out,&wset))) {
push(local_in, lmtp_out);
} else {
/* weird; this shouldn't happen */
usleep(1000);
}
}
}
int main(int argc, char **argv)
{
int opt;
int lmtpflag = 0;
int ignorequota = 0;
char *mailboxname = NULL;
char *authuser = NULL;
char *return_path = NULL;
char buf[1024];
char *alt_config = NULL;
while ((opt = getopt(argc, argv, "C:df:r:m:a:F:eE:lqD")) != EOF) {
switch(opt) {
case 'C': /* alt config file */
alt_config = optarg;
break;
case 'd':
/* Ignore -- /bin/mail compatibility flags */
break;
case 'D':
logdebug = 1;
break;
case 'r':
case 'f':
return_path = optarg;
break;
case 'm':
if (mailboxname) {
fprintf(stderr, "deliver: multiple -m options\n");
usage();
}
if (*optarg) mailboxname = optarg;
break;
case 'a':
if (authuser) {
fprintf(stderr, "deliver: multiple -a options\n");
usage();
}
authuser = optarg;
break;
case 'F': /* set IMAP flag. we no longer support this */
fprintf(stderr,"deliver: 'F' option no longer supported\n");
usage();
break;
case 'e':
/* duplicate delivery. ignore */
break;
case 'E':
fprintf(stderr,"deliver: 'E' option no longer supported\n");
usage();
break;
case 'l':
lmtpflag = 1;
break;
case 'q':
ignorequota = 1;
break;
default:
usage();
}
}
deliver_in = prot_new(0, 0);
deliver_out = prot_new(1, 1);
prot_setflushonread(deliver_in, deliver_out);
prot_settimeout(deliver_in, 300);
config_init(alt_config, "deliver");
sockaddr = config_getstring("lmtpsocket", NULL);
if (!sockaddr) {
strcpy(buf, config_dir);
strcat(buf, "/socket/lmtp");
sockaddr = buf;
}
if (lmtpflag == 1) {
int s = init_net(sockaddr);
pipe_through(s,s,0,1);
}
if (return_path == NULL) {
uid_t me = getuid();
struct passwd *p = getpwuid(me);
return_path = p->pw_name;
}
/* deliver to users or global mailbox */
return deliver_msg(return_path,authuser, ignorequota,
argv+optind, argc - optind, mailboxname);
}
void just_exit(const char *msg)
{
com_err(msg, 0, error_message(errno));
fatal(msg, EC_CONFIG);
}
/* initialize the network
* we talk on unix sockets
*/
static int init_net(const char *unixpath)
{
struct sockaddr_un addr;
if ((lmtpdsock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
just_exit("socket failed");
}
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, unixpath);
if (connect(lmtpdsock, (struct sockaddr *) &addr,
sizeof(addr.sun_family) + strlen(addr.sun_path) + 1) < 0) {
just_exit("connect failed");
}
return lmtpdsock;
}
static int deliver_msg(char *return_path, char *authuser, int ignorequota,
char **users, int numusers, char *mailbox)
{
int r;
struct lmtp_conn *conn;
struct lmtp_txn *txn = LMTP_TXN_ALLOC(numusers ? numusers : 1);
int j;
int ml = 0;
/* must have either some users or a mailbox */
if (!numusers && !mailbox) {
usage();
}
/* connect */
r = lmtp_connect(sockaddr, NULL, &conn);
if (r) {
just_exit("couldn't connect to lmtpd");
}
/* setup txn */
txn->from = return_path;
txn->auth = authuser;
txn->ignorequota = ignorequota;
txn->data = deliver_in;
txn->isdotstuffed = 0;
txn->rcpt_num = numusers ? numusers : 1;
if (mailbox) ml = strlen(mailbox);
if (numusers == 0) {
/* just deliver to mailbox 'mailbox' */
const char *BB = config_getstring("postuser", "");
txn->rcpt[0].addr = (char *) xmalloc(ml + strlen(BB) + 2); /* leaks! */
sprintf(txn->rcpt[0].addr, "%s+%s", BB, mailbox);
} else {
/* setup each recipient */
for (j = 0; j < numusers; j++) {
if (mailbox) {
/* we let it leak ! */
txn->rcpt[j].addr =
(char *) xmalloc(strlen(users[j]) + ml + 2);
sprintf(txn->rcpt[j].addr, "%s+%s", users[j], mailbox);
} else {
txn->rcpt[j].addr = users[j];
}
}
}
/* run txn */
r = lmtp_runtxn(conn, txn);
/* disconnect */
lmtp_disconnect(conn);
/* examine txn for error state */
r = 0;
for (j = 0; j < txn->rcpt_num; j++) {
switch (txn->rcpt[j].result) {
case RCPT_GOOD:
break;
case RCPT_TEMPFAIL:
r = EC_TEMPFAIL;
break;
case RCPT_PERMFAIL:
/* we just need any permanent failure, though we should
probably return data from the client-side LMTP info */
printf("%s: %s\n",
txn->rcpt[j].addr, error_message(txn->rcpt[j].r));
if (r != EC_TEMPFAIL) {
r = EC_DATAERR;
}
break;
}
}
/* return appropriately */
return r;
}

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