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deb-mbse/lib/pop3.c
2001-08-17 05:46:24 +00:00

203 lines
4.3 KiB
C

/*****************************************************************************
*
* File ..................: pop3.c
* Purpose ...............: MBSE BBS Internet Library
* Last modification date : 12-Feb-2001
*
*****************************************************************************
* Copyright (C) 1997-2001
*
* 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"
#include "records.h"
#include "clcomm.h"
#include "mbinet.h"
static int pop3sock = -1; /* TCP/IP socket */
struct hostent *php; /* Host info remote */
struct servent *psp; /* Service information */
struct sockaddr_in pop3_loc; /* For local socket address */
struct sockaddr_in pop3_rem; /* For remote socket address */
int pop3_connect(void)
{
int addrlen;
char *p;
if (!strlen(CFG.popnode)) {
WriteError("POP3: host not configured");
return -1;
}
Syslog('+', "POP3: connecting host: %s", CFG.popnode);
memset(&pop3_loc, 0, sizeof(struct sockaddr_in));
memset(&pop3_rem, 0, sizeof(struct sockaddr_in));
pop3_rem.sin_family = AF_INET;
if ((php = gethostbyname(CFG.popnode)) == NULL) {
WriteError("$POP3: can't find host %s", CFG.popnode);
return -1;
}
pop3_rem.sin_addr.s_addr = ((struct in_addr *)(php->h_addr))->s_addr;
if ((psp = getservbyname("pop3", "tcp")) == NULL) {
/*
* RedHat doesn't follow IANA specs and uses pop-3 in /etc/services
*/
if ((psp = getservbyname("pop-3", "tcp")) == NULL) {
WriteError("$POP3: can't find service port for pop3/tcp");
return -1;
}
}
pop3_rem.sin_port = psp->s_port;
if ((pop3sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
WriteError("$POP3: unable to create tcp socket");
return -1;
}
if (connect(pop3sock, (struct sockaddr *)&pop3_rem, sizeof(struct sockaddr_in)) == -1) {
WriteError("$POP3: cannot connect tcp socket");
return -1;
}
addrlen = sizeof(struct sockaddr_in);
if (getsockname(pop3sock, (struct sockaddr *)&pop3_loc, &addrlen) == -1) {
WriteError("$POP3: unable to read socket address");
return -1;
}
p = pop3_receive();
if (strlen(p) == 0) {
WriteError("POP3: no response from server");
pop3_close();
return -1;
}
if (strncmp(p, "+OK", 3)) {
WriteError("POP3: bad response: %s", p);
pop3_close();
return -1;
}
Syslog('+', "POP3: %s", p);
return pop3sock;
}
int pop3_send(char *buf)
{
if (pop3sock == -1)
return -1;
if (send(pop3sock, buf, strlen(buf), 0) != strlen(buf)) {
WriteError("$POP3: socket send failed");
return -1;
}
return 0;
}
/*
* Return empty buffer if something went wrong, else the complete
* dataline is returned
*/
char *pop3_receive(void)
{
static char buf[SS_BUFSIZE];
int i, j;
memset((char *)&buf, 0, SS_BUFSIZE);
i = 0;
while (TRUE) {
j = recv(pop3sock, &buf[i], 1, 0);
if (j == -1) {
WriteError("$POP3: error reading socket");
memset((char *)&buf, 0, SS_BUFSIZE);
return buf;
}
if (buf[i] == '\n')
break;
i += j;
}
for (i = 0; i < strlen(buf); i++) {
if (buf[i] == '\n')
buf[i] = '\0';
if (buf[i] == '\r')
buf[i] = '\0';
}
return buf;
}
int pop3_close(void)
{
if (pop3sock == -1)
return 0;
if (shutdown(pop3sock, 1) == -1) {
WriteError("$POP3: can't close socket");
return -1;
}
pop3sock = -1;
Syslog('+', "POP3: closed");
return 0;
}
int pop3_cmd(char *cmd)
{
char *p;
if (pop3_send(cmd) == -1)
return -1;
p = pop3_receive();
if (strncmp(p, "+OK", 3)) {
WriteError("POP3> %s", cmd);
WriteError("POP3< %s", p);
return -1;
}
return 0;
}