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deb-mbse/lib/pop3.c

196 lines
4.1 KiB
C

/*****************************************************************************
*
* Purpose ...............: MBSE BBS Internet Library
*
*****************************************************************************
* Copyright (C) 1997-2011
*
* 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, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*****************************************************************************/
#include "../config.h"
#include "mbselib.h"
#include "mbinet.h"
static int pop3sock = -1; /* TCP/IP socket */
int pop3_connect(void)
{
char *q, *ipver = NULL, ipstr[INET6_ADDRSTRLEN];
struct addrinfo hints, *res = NULL, *p;
int rc;
if (!strlen(CFG.popnode)) {
WriteError("POP3: host not configured");
return -1;
}
Syslog('+', "POP3: connecting host: %s", CFG.popnode);
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
if ((rc = getaddrinfo(CFG.popnode, "pop3", &hints, &res)) != 0) {
WriteError("getaddrinfo %s: %s\n", CFG.popnode, gai_strerror(rc));
return -1;
}
for (p = res; p != NULL; p = p->ai_next) {
void *addr;
if (p->ai_family == AF_INET) {
struct sockaddr_in *ipv4 = (struct sockaddr_in *)p->ai_addr;
addr = &(ipv4->sin_addr);
ipver = (char *)"IPv4";
} else {
struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)p->ai_addr;
addr = &(ipv6->sin6_addr);
ipver = (char *)"IPv6";
}
inet_ntop(p->ai_family, addr, ipstr, sizeof ipstr);
Syslog('+', "Trying %s %s port pop3", ipver, ipstr);
if ((pop3sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) {
WriteError("$socket()");
return -1;
} else {
if (connect(pop3sock, p->ai_addr, p->ai_addrlen) == -1) {
WriteError("$connect %s port pop3", ipstr);
close(pop3sock);
} else {
break;
}
}
}
if (p == NULL) {
return -1; /* Not connected */
}
q = pop3_receive();
if (strlen(q) == 0) {
WriteError("POP3: no response from server");
pop3_close();
return -1;
}
if (strncmp(q, "+OK", 3)) {
WriteError("POP3: bad response: %s", q);
pop3_close();
return -1;
}
Syslog('+', "POP3: %s", q);
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;
}