#include "config.h"
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <time.h>
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#if defined(STDC_HEADERS)
#include <stdlib.h>
#endif
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif
#if defined(HAVE_STDARG_H)
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#include <ctype.h>
#include <time.h>
#include "fetchmail.h"
#include "socket.h"
#include "smtp.h"
#include "i18n.h"
#if !defined(SIGCHLD) && defined(SIGCLD)
#define SIGCHLD SIGCLD
#endif
static int lmtp_responses;
int smtp_open(struct query *ctl)
{
if (NUM_NONZERO(ctl->batchlimit) && (ctl->smtp_socket != -1) && ++batchcount == ctl->batchlimit)
{
SockClose(ctl->smtp_socket);
ctl->smtp_socket = -1;
batchcount = 0;
}
if (ctl->smtp_socket == -1)
{
struct idlist *idp;
const char *id_me = run.invisible ? ctl->server.truename : fetchmailhost;
int oldphase = phase;
errno = 0;
oldphase = phase;
phase = LISTENER_WAIT;
set_timeout(ctl->server.timeout);
for (idp = ctl->smtphunt; idp; idp = idp->next)
{
char *cp, *parsed_host;
#ifdef INET6_ENABLE
char *portnum = SMTP_PORT;
#else
int portnum = SMTP_PORT;
#endif
xalloca(parsed_host, char *, strlen(idp->id) + 1);
ctl->smtphost = idp->id;
if(ctl->smtphost[0]=='/')
ctl->listener = LMTP_MODE;
strcpy(parsed_host, idp->id);
if ((cp = strrchr(parsed_host, '/')))
{
*cp++ = 0;
#ifdef INET6_ENABLE
portnum = cp;
#else
portnum = atoi(cp);
#endif
}
if (ctl->smtphost[0]=='/'){
if((ctl->smtp_socket = UnixOpen(ctl->smtphost))==-1)
continue;
} else
if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,NULL,
ctl->server.plugout)) == -1)
continue;
if (ctl->server.protocol == P_ODMR)
return(ctl->smtp_socket);
SMTP_setmode(ctl->listener);
if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
SMTP_ehlo(ctl->smtp_socket, id_me,
&ctl->server.esmtp_options) == SM_OK)
break;
SockClose(ctl->smtp_socket);
ctl->smtp_socket = -1;
if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,NULL,
ctl->server.plugout)) == -1)
continue;
if (SMTP_ok(ctl->smtp_socket) == SM_OK &&
SMTP_helo(ctl->smtp_socket, id_me) == SM_OK)
break;
SockClose(ctl->smtp_socket);
ctl->smtp_socket = -1;
}
set_timeout(0);
phase = oldphase;
}
ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : ( ctl->smtphost && ctl->smtphost[0] != '/' ? ctl->smtphost : "localhost");
if (outlevel >= O_DEBUG && ctl->smtp_socket != -1)
report(stdout, _("forwarding to %s\n"), ctl->smtphost);
return(ctl->smtp_socket);
}
static FILE *sinkfp;
int stuffline(struct query *ctl, char *buf)
{
int n, oldphase;
char *last;
last = buf;
while ((last += strlen(last)) && (last[-1] != '\n'))
last++;
if (ctl->forcecr)
{
if (last - 1 == buf || last[-2] != '\r')
{
last[-1] = '\r';
*last++ = '\n';
*last = '\0';
}
}
oldphase = phase;
phase = FORWARDING_WAIT;
if (*buf == '.')
{
if (ctl->server.base_protocol->delimited)
{
if (ctl->mda)
++buf;
else
;
}
else
{
if (!ctl->mda)
SockWrite(ctl->smtp_socket, buf, 1);
else
;
}
}
if (ctl->stripcr)
{
char *sp, *tp;
for (sp = tp = buf; sp < last; sp++)
if (*sp != '\r')
*tp++ = *sp;
*tp = '\0';
last = tp;
}
n = 0;
if (ctl->mda || ctl->bsmtp)
n = fwrite(buf, 1, last - buf, sinkfp);
else if (ctl->smtp_socket != -1)
n = SockWrite(ctl->smtp_socket, buf, last - buf);
phase = oldphase;
return(n);
}
static void sanitize(char *s)
{
const static char *ok_chars = " 1234567890!@%-_=+:,./abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
char *cp;
for (cp = s; *(cp += strspn(cp, ok_chars)); )
*cp = '_';
}
static int send_bouncemail(struct query *ctl, struct msgblk *msg,
int userclass, char *message,
int nerrors, char *errors[])
{
char daemon_name[18 + HOSTLEN] = "FETCHMAIL-DAEMON@";
char boundary[BUFSIZ], *bounce_to;
int sock;
if (!msg->return_path[0] || strcmp(msg->return_path, "<>") == 0)
return(FALSE);
bounce_to = (run.bouncemail ? msg->return_path : run.postmaster);
SMTP_setmode(SMTP_MODE);
strcat(daemon_name, host_fqdn());
if ((sock = SockOpen("localhost", SMTP_PORT, NULL, NULL)) == -1
|| SMTP_ok(sock) != SM_OK
|| SMTP_helo(sock, fetchmailhost) != SM_OK
|| SMTP_from(sock, daemon_name, (char *)NULL) != SM_OK
|| SMTP_rcpt(sock, bounce_to) != SM_OK
|| SMTP_data(sock) != SM_OK)
return(FALSE);
#ifdef HAVE_SNPRINTF
snprintf(boundary, sizeof(boundary),
#else
sprintf(boundary,
#endif
"foo-mani-padme-hum-%d-%d-%ld",
(int)getpid(), (int)getppid(), time((time_t *)NULL));
if (outlevel >= O_VERBOSE)
report(stdout, _("SMTP: (bounce-message body)\n"));
else
report(stderr, _("mail from %s bounced to %s\n"),
daemon_name, bounce_to);
SockPrintf(sock, "Return-Path: <>\r\n");
SockPrintf(sock, "From: %s\r\n", daemon_name);
SockPrintf(sock, "To: %s\r\n", bounce_to);
SockPrintf(sock, "MIME-Version: 1.0\r\n");
SockPrintf(sock, "Content-Type: multipart/report; report-type=delivery-status;\r\n\tboundary=\"%s\"\r\n", boundary);
SockPrintf(sock, "\r\n");
SockPrintf(sock, "--%s\r\n", boundary);
SockPrintf(sock,"Content-Type: text/plain\r\n");
SockPrintf(sock, "\r\n");
SockWrite(sock, message, strlen(message));
SockPrintf(sock, "\r\n");
SockPrintf(sock, "\r\n");
if (nerrors)
{
struct idlist *idp;
int nusers;
SockPrintf(sock, "--%s\r\n", boundary);
SockPrintf(sock,"Content-Type: message/delivery-status\r\n");
SockPrintf(sock, "\r\n");
SockPrintf(sock, "Reporting-MTA: dns; %s\r\n", fetchmailhost);
nusers = 0;
for (idp = msg->recipients; idp; idp = idp->next)
if (idp->val.status.mark == userclass)
{
char *error;
SockPrintf(sock, "\r\n");
SockPrintf(sock, "Final-Recipient: rfc822; %s@%s\r\n",
idp->id, fetchmailhost);
SockPrintf(sock, "Last-Attempt-Date: %s\r\n", rfc822timestamp());
SockPrintf(sock, "Action: failed\r\n");
if (nerrors == 1)
error = errors[0];
else if (nerrors > nusers)
{
SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
break;
}
else
error = errors[nusers++];
if (strlen(error) > 9 && isdigit(error[4])
&& error[5] == '.' && isdigit(error[6])
&& error[7] == '.' && isdigit(error[8]))
SockPrintf(sock, "Status: %5.5s\r\n", &(error[4]));
else
SockPrintf(sock, "Status: %c.0.0\r\n", error[0]);
SockPrintf(sock, "Diagnostic-Code: %s\r\n", error);
}
SockPrintf(sock, "\r\n");
}
SockPrintf(sock, "--%s\r\n", boundary);
SockPrintf(sock, "Content-Type: text/rfc822-headers\r\n");
SockPrintf(sock, "\r\n");
SockWrite(sock, msg->headers, strlen(msg->headers));
SockPrintf(sock, "\r\n");
SockPrintf(sock, "--%s--\r\n", boundary);
if (SMTP_eom(sock) != SM_OK || SMTP_quit(sock))
return(FALSE);
SockClose(sock);
return(TRUE);
}
static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
{
int smtperr = atoi(smtp_response);
char *responses[1];
xalloca(responses[0], char *, strlen(smtp_response)+1);
strcpy(responses[0], smtp_response);
#ifdef __UNUSED__
SMTP_rset(ctl->smtp_socket);
if (outlevel >= O_DEBUG)
report(stdout, _("Saved error is still %d\n"), smtperr);
#endif
if (str_find(&ctl->antispam, smtperr))
{
if (run.spambounce)
send_bouncemail(ctl, msg, XMIT_ACCEPT,
"Our spam filter rejected this transaction.\r\n",
1, responses);
return(PS_REFUSED);
}
if (smtperr >= 400)
report(stderr, _("%cMTP error: %s\n"),
ctl->listener,
responses[0]);
switch (smtperr)
{
case 552:
send_bouncemail(ctl, msg, XMIT_ACCEPT,
"This message was too large (SMTP error 552).\r\n",
1, responses);
return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
case 553:
send_bouncemail(ctl, msg, XMIT_ACCEPT,
"Invalid address in MAIL FROM (SMTP error 553).\r\n",
1, responses);
return(PS_REFUSED);
default:
if (smtperr >= 500 && smtperr <= 599)
if (send_bouncemail(ctl, msg, XMIT_ACCEPT,
"General SMTP/ESMTP error.\r\n",
1, responses))
return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
return(PS_TRANSIENT);
}
}
int open_sink(struct query *ctl, struct msgblk *msg,
int *good_addresses, int *bad_addresses)
{
struct idlist *idp;
#ifdef HAVE_SIGACTION
struct sigaction sa_new;
#endif
*bad_addresses = *good_addresses = 0;
if (ctl->bsmtp)
{
if (strcmp(ctl->bsmtp, "-") == 0)
sinkfp = stdout;
else
sinkfp = fopen(ctl->bsmtp, "a");
fprintf(sinkfp,
"MAIL FROM: %s", (msg->return_path[0]) ? msg->return_path : user);
if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
fputs(" BODY=8BITMIME", sinkfp);
else if (ctl->mimemsg & MSG_IS_7BIT)
fputs(" BODY=7BIT", sinkfp);
fprintf(sinkfp, "\r\n");
ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : "localhost";
*bad_addresses = 0;
for (idp = msg->recipients; idp; idp = idp->next)
if (idp->val.status.mark == XMIT_ACCEPT)
{
if (ctl->smtpname)
fprintf(sinkfp, "RCPT TO: %s\r\n", ctl->smtpname);
else if (strchr(idp->id, '@'))
fprintf(sinkfp,
"RCPT TO: %s\r\n", idp->id);
else
fprintf(sinkfp,
"RCPT TO: %s@%s\r\n", idp->id, ctl->destaddr);
*good_addresses = 0;
}
fputs("DATA\r\n", sinkfp);
if (ferror(sinkfp))
{
report(stderr, _("BSMTP file open or preamble write failed\n"));
return(PS_BSMTP);
}
}
else if (!ctl->mda && smtp_open(ctl) != -1)
{
const char *ap;
char options[MSGBUFSIZE];
char addr[HOSTLEN+USERNAMELEN+1];
int total_addresses;
options[0] = '\0';
if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
strcpy(options, " BODY=8BITMIME");
else if (ctl->mimemsg & MSG_IS_7BIT)
strcpy(options, " BODY=7BIT");
}
if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
sprintf(options + strlen(options), " SIZE=%d", msg->reallen);
if (!msg->return_path[0] || (0 == strcmp(msg->return_path, "@")))
{
#ifdef HAVE_SNPRINTF
snprintf(addr, sizeof(addr),
#else
sprintf(addr,
#endif
"%s@%s", ctl->remotename, ctl->server.truename);
ap = addr;
}
else if (strchr(msg->return_path,'@') || strchr(msg->return_path,'!'))
ap = msg->return_path;
else
{
#ifdef HAVE_SNPRINTF
snprintf(addr, sizeof(addr),
#else
sprintf(addr,
#endif
"%s@%s", msg->return_path, ctl->server.truename);
ap = addr;
}
if (SMTP_from(ctl->smtp_socket, ap, options) != SM_OK)
{
int err = handle_smtp_report(ctl, msg);
SMTP_rset(ctl->smtp_socket);
return(err);
}
total_addresses = 0;
for (idp = msg->recipients; idp; idp = idp->next)
total_addresses++;
for (idp = msg->recipients; idp; idp = idp->next)
if (idp->val.status.mark == XMIT_ACCEPT)
{
if (strchr(idp->id, '@'))
strcpy(addr, idp->id);
else {
if (ctl->smtpname) {
#ifdef HAVE_SNPRINTF
snprintf(addr, sizeof(addr)-1, "%s", ctl->smtpname);
#else
sprintf(addr, "%s", ctl->smtpname);
#endif
} else {
#ifdef HAVE_SNPRINTF
snprintf(addr, sizeof(addr)-1, "%s@%s", idp->id, ctl->destaddr);
#else
sprintf(addr, "%s@%s", idp->id, ctl->destaddr);
#endif
}
}
if (SMTP_rcpt(ctl->smtp_socket, addr) == SM_OK)
(*good_addresses)++;
else
{
char errbuf[POPBUFSIZE];
handle_smtp_report(ctl, msg);
(*bad_addresses)++;
idp->val.status.mark = XMIT_RCPTBAD;
if (outlevel >= O_VERBOSE)
report(stderr,
_("%cMTP listener doesn't like recipient address `%s'\n"),
ctl->listener, addr);
}
}
if (!(*good_addresses))
{
if (!run.postmaster[0])
{
if (outlevel >= O_VERBOSE)
report(stderr, _("no address matches; no postmaster set.\n"));
SMTP_rset(ctl->smtp_socket);
return(PS_REFUSED);
}
if (strchr(run.postmaster, '@'))
strncpy(addr, run.postmaster, sizeof(addr));
else
{
#ifdef HAVE_SNPRINTF
snprintf(addr, sizeof(addr)-1, "%s@%s", run.postmaster, ctl->destaddr);
#else
sprintf(addr, "%s@%s", run.postmaster, ctl->destaddr);
#endif
}
if (SMTP_rcpt(ctl->smtp_socket, addr) != SM_OK)
{
report(stderr, _("can't even send to %s!\n"), run.postmaster);
SMTP_rset(ctl->smtp_socket);
return(PS_REFUSED);
}
if (outlevel >= O_VERBOSE)
report(stderr, _("no address matches; forwarding to %s.\n"), run.postmaster);
}
if (SMTP_data(ctl->smtp_socket) != SM_OK)
{
SMTP_rset(ctl->smtp_socket);
return(handle_smtp_report(ctl, msg));
}
}
else if (!ctl->mda)
{
report(stderr, _("%cMTP connect to %s failed\n"),
ctl->listener,
ctl->smtphost ? ctl->smtphost : "localhost");
#ifndef FALLBACK_MDA
return(PS_SMTP);
#else
if (ctl->smtphost && strcmp(ctl->smtphost, "localhost"))
return(PS_SMTP);
ctl->mda = FALLBACK_MDA;
report(stderr, _("can't raise the listener; falling back to %s"),
FALLBACK_MDA);
#endif
}
if (ctl->mda)
{
int length = 0, fromlen = 0, nameslen = 0;
char *names = NULL, *before, *after, *from = NULL;
ctl->destaddr = "localhost";
for (idp = msg->recipients; idp; idp = idp->next)
if (idp->val.status.mark == XMIT_ACCEPT)
(*good_addresses)++;
length = strlen(ctl->mda);
before = xstrdup(ctl->mda);
if (strstr(before, "%s") || strstr(before, "%T"))
{
nameslen = 0;
for (idp = msg->recipients; idp; idp = idp->next)
if ((idp->val.status.mark == XMIT_ACCEPT))
nameslen += (strlen(idp->id) + 1);
if ((*good_addresses == 0))
nameslen = strlen(run.postmaster);
names = (char *)xmalloc(nameslen + 1);
if (*good_addresses == 0)
strcpy(names, run.postmaster);
else
{
names[0] = '\0';
for (idp = msg->recipients; idp; idp = idp->next)
if (idp->val.status.mark == XMIT_ACCEPT)
{
strcat(names, idp->id);
strcat(names, " ");
}
names[--nameslen] = '\0';
}
sanitize(names);
}
if (strstr(before, "%F"))
{
from = xstrdup(msg->return_path);
sanitize(from);
fromlen = strlen(from);
}
if (names || from)
{
char *sp, *dp;
sp = before;
while ((sp = strstr(sp, "%s"))) {
length += nameslen - 2;
sp += 2;
}
sp = before;
while ((sp = strstr(sp, "%T"))) {
length += nameslen - 2;
sp += 2;
}
sp = before;
while ((sp = strstr(sp, "%F"))) {
length += fromlen - 2;
sp += 2;
}
after = xmalloc(length + 1);
for (dp = after, sp = before; (*dp = *sp); dp++, sp++) {
if (sp[0] != '%') continue;
if (sp[1] == 's' || sp[1] == 'T') {
strcpy(dp, names);
dp += nameslen;
sp++;
dp--;
} else if (sp[1] == 'F') {
strcpy(dp, from);
dp += fromlen;
sp++;
dp--;
}
}
if (names) {
free(names);
names = NULL;
}
if (from) {
free(from);
from = NULL;
}
free(before);
before = after;
}
if (outlevel >= O_DEBUG)
report(stdout, _("about to deliver with: %s\n"), before);
#ifdef HAVE_SETEUID
seteuid(ctl->uid);
#endif
sinkfp = popen(before, "w");
free(before);
before = NULL;
#ifdef HAVE_SETEUID
seteuid(0);
#endif
if (!sinkfp)
{
report(stderr, _("MDA open failed\n"));
return(PS_IOERR);
}
#ifndef HAVE_SIGACTION
sigchld = signal(SIGCHLD, SIG_DFL);
#else
memset (&sa_new, 0, sizeof sa_new);
sigemptyset (&sa_new.sa_mask);
sa_new.sa_handler = SIG_DFL;
sigaction (SIGCHLD, &sa_new, NULL);
#endif
}
lmtp_responses = *good_addresses;
return(PS_SUCCESS);
}
void release_sink(struct query *ctl)
{
if (ctl->bsmtp && sinkfp)
fclose(sinkfp);
else if (ctl->mda)
{
if (sinkfp)
{
pclose(sinkfp);
sinkfp = (FILE *)NULL;
}
deal_with_sigchld();
}
}
int close_sink(struct query *ctl, struct msgblk *msg, flag forward)
{
if (ctl->mda)
{
int rc;
if (sinkfp)
{
rc = pclose(sinkfp);
sinkfp = (FILE *)NULL;
}
else
rc = 0;
deal_with_sigchld();
if (rc)
{
report(stderr,
_("MDA returned nonzero status %d\n"), rc);
return(FALSE);
}
}
else if (ctl->bsmtp && sinkfp)
{
int error;
fputs(".\r\n", sinkfp);
error = ferror(sinkfp);
if (strcmp(ctl->bsmtp, "-"))
if (fclose(sinkfp) == EOF) error = 1;
if (error)
{
report(stderr,
_("Message termination or close of BSMTP file failed\n"));
return(FALSE);
}
}
else if (forward)
{
if (SMTP_eom(ctl->smtp_socket) != SM_OK)
{
if (handle_smtp_report(ctl, msg) != PS_REFUSED)
{
SMTP_rset(ctl->smtp_socket);
return(FALSE);
}
else
{
report(stderr, _("SMTP listener refused delivery\n"));
SMTP_rset(ctl->smtp_socket);
return(TRUE);
}
}
if (ctl->listener == LMTP_MODE)
{
if (lmtp_responses == 0)
{
SMTP_ok(ctl->smtp_socket);
if (atoi(smtp_response) == 503)
report(stderr, _("LMTP delivery error on EOM\n"));
else
report(stderr,
_("Unexpected non-503 response to LMTP EOM: %s\n"),
smtp_response);
return(FALSE);
}
else
{
int i, errors;
char **responses;
xalloca(responses, char **, sizeof(char *) * lmtp_responses);
for (errors = i = 0; i < lmtp_responses; i++)
{
if (SMTP_ok(ctl->smtp_socket) == SM_OK)
responses[i] = (char *)NULL;
else
{
xalloca(responses[errors],
char *,
strlen(smtp_response)+1);
strcpy(responses[errors], smtp_response);
errors++;
}
}
if (errors == 0)
return(TRUE);
else
return(send_bouncemail(ctl, msg, XMIT_ACCEPT,
"LSMTP partial delivery failure.\r\n",
errors, responses));
}
}
}
return(TRUE);
}
int open_warning_by_mail(struct query *ctl, struct msgblk *msg)
{
int good, bad;
struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON@", 0};
strcat(reply.return_path, fetchmailhost);
if (!MULTIDROP(ctl))
{
int status;
save_str(&reply.recipients, ctl->localnames->id, XMIT_ACCEPT);
status = open_sink(ctl, &reply, &good, &bad);
free_str_list(&reply.recipients);
return(status);
}
else
return(open_sink(ctl, &reply, &good, &bad));
}
#if defined(HAVE_STDARG_H)
void stuff_warning(struct query *ctl, const char *fmt, ... )
#else
void stuff_warning(struct query *ctl, fmt, va_alist)
struct query *ctl;
const char *fmt;
va_dcl
#endif
{
char buf[POPBUFSIZE];
va_list ap;
#if defined(HAVE_STDARG_H)
va_start(ap, fmt) ;
#else
va_start(ap);
#endif
#ifdef HAVE_VSNPRINTF
vsnprintf(buf, sizeof(buf), fmt, ap);
#else
vsprintf(buf, fmt, ap);
#endif
va_end(ap);
#ifdef HAVE_SNPRINTF
snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
#else
strcat(buf, "\r\n");
#endif
stuffline(ctl, buf);
}
void close_warning_by_mail(struct query *ctl, struct msgblk *msg)
{
stuff_warning(ctl, _("--\r\n\t\t\t\tThe Fetchmail Daemon\r\n"));
close_sink(ctl, msg, TRUE);
}