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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) 1994-2008 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 legal
* details, please contact
* Carnegie Mellon University
* Center for Technology Transfer and Enterprise Creation
* 4615 Forbes Avenue
* Suite 302
* Pittsburgh, PA 15213
* (412) 268-7393, fax: (412) 268-7395
* innovation@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 <fcntl.h>
#include <sys/stat.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 "global.h"
#include "exitcodes.h"
#include "imap/imap_err.h"
#include "xmalloc.h"
#include "xstrlcpy.h"
#include "xstrlcat.h"
#include "lmtpengine.h"
#include "prot.h"
#include "proxy.h"
#include "version.h"
extern int optind;
extern char *optarg;
static int logdebug = 0;
static struct protstream *deliver_out, *deliver_in;
static const char *sockaddr;
static struct protocol_t lmtp_protocol =
{ "lmtp", "lmtp", TYPE_STD,
{ { { 0, "220 " },
{ "LHLO", "deliver", "250 ", NULL,
CAPAF_ONE_PER_LINE|CAPAF_SKIP_FIRST_WORD,
{ { "AUTH", CAPA_AUTH },
{ "STARTTLS", CAPA_STARTTLS },
{ "PIPELINING", CAPA_PIPELINING },
{ "IGNOREQUOTA", CAPA_IGNOREQUOTA },
{ NULL, 0 } } },
{ "STARTTLS", "220", "454", 0 },
{ "AUTH", 512, 0, "235", "5", "334 ", "*", NULL, 0 },
{ NULL, NULL, NULL },
{ "NOOP", NULL, "250" },
{ "QUIT", NULL, "221" } } }
};
/* unused for deliver.c, but needed to make lmtpengine.c happy */
int deliver_logfd = -1;
/* forward declarations */
static int deliver_msg(char *return_path, char *authuser, int ignorequota,
char **users, int numusers, char *mailbox);
static struct backend *init_net(const char *sockaddr);
static void usage(void)
{
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);
}
EXPORTED void fatal(const char* s, int code)
{
static int recurse_code = 0;
if(recurse_code) exit(code);
else recurse_code = 0;
prot_printf(deliver_out,"421 4.3.0 deliver: %s\r\n", s);
prot_flush(deliver_out);
cyrus_done();
exit(code);
}
/*
* Here we're just an intermediatory piping stdin to lmtp socket
* and lmtp socket to stdout
*/
void pipe_through(struct backend *conn)
{
struct protgroup *protin = protgroup_new(2);
protgroup_insert(protin, deliver_in);
protgroup_insert(protin, conn->in);
do {
/* Flush any buffered output */
prot_flush(deliver_out);
prot_flush(conn->out);
} while (!proxy_check_input(protin, deliver_in, deliver_out,
conn->in, conn->out, 0));
/* ok, we're done. */
protgroup_free(protin);
return;
}
int main(int argc, char **argv)
{
int r = 0;
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();
/* NOTREACHED */
}
if (*optarg) mailboxname = optarg;
break;
case 'a':
if (authuser) {
fprintf(stderr, "deliver: multiple -a options\n");
usage();
/* NOTREACHED */
}
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();
/* NOTREACHED */
}
}
deliver_in = prot_new(0, 0);
deliver_out = prot_new(1, 1);
prot_setflushonread(deliver_in, deliver_out);
prot_settimeout(deliver_in, 300);
cyrus_init(alt_config, "deliver", CYRUSINIT_NODB, CONFIG_NEED_PARTITION_DATA);
sockaddr = config_getstring(IMAPOPT_LMTPSOCKET);
if (!sockaddr) {
strlcpy(buf, config_dir, sizeof(buf));
strlcat(buf, "/socket/lmtp", sizeof(buf));
sockaddr = buf;
}
if (lmtpflag == 1) {
struct backend *conn = init_net(sockaddr);
pipe_through(conn);
backend_disconnect(conn);
free(conn);
}
else {
if (return_path == NULL) {
uid_t me = getuid();
struct passwd *p = getpwuid(me);
return_path = p->pw_name;
}
/* deliver to users or global mailbox */
r = deliver_msg(return_path,authuser, ignorequota,
argv+optind, argc - optind, mailboxname);
}
cyrus_done();
return r;
}
static void just_exit(const char *msg)
{
com_err(msg, 0, "%s", error_message(errno));
fatal(msg, EC_CONFIG);
}
/* initialize the network
* we talk on unix sockets
*/
static struct backend *init_net(const char *unixpath)
{
int lmtpdsock;
struct sockaddr_un addr;
struct backend *conn;
if ((lmtpdsock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
just_exit("socket failed");
}
addr.sun_family = AF_UNIX;
strlcpy(addr.sun_path, unixpath, sizeof(addr.sun_path));
if (connect(lmtpdsock, (struct sockaddr *) &addr,
sizeof(addr.sun_family) + strlen(addr.sun_path) + 1) < 0) {
just_exit("connect failed");
}
conn = xzmalloc(sizeof(struct backend));
conn->timeout = NULL;
conn->in = prot_new(lmtpdsock, 0);
conn->out = prot_new(lmtpdsock, 1);
conn->sock = lmtpdsock;
prot_setflushonread(conn->in, conn->out);
conn->prot = &lmtp_protocol;
return conn;
}
static int deliver_msg(char *return_path, char *authuser, int ignorequota,
char **users, int numusers, char *mailbox)
{
int r;
struct backend *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 */
conn = backend_connect(NULL, sockaddr, &lmtp_protocol,
"", NULL, NULL, -1);
if (!conn) {
just_exit("couldn't connect to lmtpd");
}
/* setup txn */
txn->from = return_path;
txn->auth = authuser;
txn->data = deliver_in;
txn->isdotstuffed = 0;
txn->tempfail_unknown_mailbox = 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(IMAPOPT_POSTUSER);
txn->rcpt[0].addr = (char *) xmalloc(ml + strlen(BB) + 2); /* xxx leaks! */
sprintf(txn->rcpt[0].addr, "%s+%s", BB, mailbox);
txn->rcpt[0].ignorequota = ignorequota;
} else {
/* setup each recipient */
for (j = 0; j < numusers; j++) {
if (mailbox) {
size_t ulen;
txn->rcpt[j].addr =
(char *) xmalloc(strlen(users[j]) + ml + 2);
/* find the length of the userid minus the domain */
ulen = strcspn(users[j], "@");
sprintf(txn->rcpt[j].addr, "%.*s+%s",
(int) ulen, users[j], mailbox);
/* add the domain if we have one */
if (ulen < strlen(users[j]))
strcat(txn->rcpt[j].addr, users[j]+ulen);
} else {
txn->rcpt[j].addr = xstrdup(users[j]);
}
txn->rcpt[j].ignorequota = ignorequota;
}
}
/* run txn */
r = lmtp_runtxn(conn, txn);
/* disconnect */
backend_disconnect(conn);
free(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;
}
free(txn->rcpt[j].addr);
}
free(txn);
/* return appropriately */
return r;
}

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