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deb-mbse/lib/smtp.c

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/*****************************************************************************
*
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* $Id$
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* Purpose ...............: MBSE BBS Internet Library
*
*****************************************************************************
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* Copyright (C) 1997-2002
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*
* Michiel Broek FIDO: 2:280/2802
* Beekmansbos 10
* 1971 BV IJmuiden
* the Netherlands
*
* This file is part of MBSE BBS.
*
* This BBS is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* MBSE BBS is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MBSE BBS; see the file COPYING. If not, write to the Free
* Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*****************************************************************************/
#include "libs.h"
#include "structs.h"
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#include "users.h"
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#include "records.h"
#include "clcomm.h"
#include "mbinet.h"
static int smtpsock = -1; /* TCP/IP socket */
struct hostent *shp; /* Host info remote */
struct servent *ssp; /* Service information */
struct sockaddr_in smtp_loc; /* For local socket address */
struct sockaddr_in smtp_rem; /* For remote socket address */
int smtp_connect(void)
{
int addrlen;
char *p, temp[40];
if (smtpsock != -1)
return smtpsock;
if (!strlen(CFG.smtpnode)) {
WriteError("SMTP: host not configured");
return -1;
}
Syslog('+', "SMTP: connecting host: %s", CFG.smtpnode);
memset(&smtp_loc, 0, sizeof(struct sockaddr_in));
memset(&smtp_rem, 0, sizeof(struct sockaddr_in));
smtp_rem.sin_family = AF_INET;
if ((shp = gethostbyname(CFG.smtpnode)) == NULL) {
WriteError("$SMTP: can't find host %s", CFG.smtpnode);
return -1;
}
smtp_rem.sin_addr.s_addr = ((struct in_addr *)(shp->h_addr))->s_addr;
if ((ssp = getservbyname("smtp", "tcp")) == NULL) {
WriteError("$SMTP: can't find service port for smtp/tcp");
return -1;
}
smtp_rem.sin_port = ssp->s_port;
if ((smtpsock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
WriteError("$SMTP: unable to create tcp socket");
return -1;
}
if (connect(smtpsock, (struct sockaddr *)&smtp_rem, sizeof(struct sockaddr_in)) == -1) {
WriteError("$SMTP: can't connect tcp socket");
return -1;
}
addrlen = sizeof(struct sockaddr_in);
if (getsockname(smtpsock, (struct sockaddr *)&smtp_loc, &addrlen) == -1) {
WriteError("$SMTP: unable to read socket address");
return -1;
}
p = smtp_receive();
if (strlen(p) == 0) {
WriteError("SMTP: no response");
smtp_close();
return -1;
}
if (strncmp(p, "220", 3)) {
WriteError("SMTP: bad response: %s", p);
smtp_close();
return -1;
}
Syslog('+', "SMTP: %s", p);
sprintf(temp, "HELO %s\r\n", CFG.sysdomain);
if (smtp_cmd(temp, 250)) {
smtp_close();
return -1;
}
return smtpsock;
}
int smtp_send(char *buf)
{
if (smtpsock == -1)
return -1;
if (send(smtpsock, buf, strlen(buf), 0) != strlen(buf)) {
WriteError("$SMTP: socket send failed");
return -1;
}
return 0;
}
/*
* Return empty buffer if something went wrong, else the complete
* dataline is returned
*/
char *smtp_receive(void)
{
static char buf[SS_BUFSIZE];
int i, j;
memset((char *)&buf, 0, SS_BUFSIZE);
i = 0;
while ((strchr(buf, '\n')) == NULL) {
j = recv(smtpsock, &buf[i], SS_BUFSIZE-i, 0);
if (j == -1) {
WriteError("$SMTP: error reading socket");
memset((char *)&buf, 0, SS_BUFSIZE);
return buf;
}
i += j;
}
for (i = 0; i < strlen(buf); i++) {
if (buf[i] == '\n')
buf[i] = '\0';
if (buf[i] == '\r')
buf[i] = '\0';
}
return buf;
}
int smtp_close(void)
{
if (smtpsock == -1)
return 0;
smtp_cmd((char *)"QUIT\r\n", 221);
if (shutdown(smtpsock, 1) == -1) {
WriteError("$SMTP: can't close socket");
return -1;
}
smtpsock = -1;
Syslog('+', "SMTP: closed");
return 0;
}
/*
* Send command to the SMTP service. On error return the
* received error number, else return zero.
*/
int smtp_cmd(char *cmd, int resp)
{
char *p, rsp[6];
if (smtp_send(cmd) == -1)
return -1;
sprintf(rsp, "%d", resp);
p = smtp_receive();
if (strncmp(p, rsp, strlen(rsp))) {
WriteError("SMTP> %s", cmd);
WriteError("SMTP< %s", p);
memset(&resp, 0, sizeof(rsp));
strncpy(rsp, p, 3);
return atoi(rsp);
}
return 0;
}