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/* $Id: socket.c,v 1.6 2003/10/05 17:58:50 reinelt Exp $
*
* simple socket functions
*
* Copyright 2001 Leopold T�tsch <lt@toetsch.at>
*
* This file is part of LCD4Linux.
*
* LCD4Linux 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.
*
* LCD4Linux 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* $Log: socket.c,v $
* Revision 1.6 2003/10/05 17:58:50 reinelt
* libtool junk; copyright messages cleaned up
*
* Revision 1.5 2002/12/05 19:09:57 reinelt
* patches for gcc-3.2
*
* Revision 1.4 2001/09/12 05:58:16 reinelt
* fixed bug in mail2.c
*
* Revision 1.3 2001/09/12 05:37:22 reinelt
*
* fixed a bug in seti.c (file was never closed, lcd4linux run out of fd's
*
* improved socket debugging
*
* Revision 1.2 2001/03/15 14:25:05 ltoetsch
* added unread/total news
*
* Revision 1.1 2001/03/14 13:19:29 ltoetsch
* Added pop3/imap4 mail support
*
*
*/
/*
* Exported Functions:
*
* int open_socket(char *machine, int port);
*
* open and connect to socket on machine:port
* returns fd on success or -1 on error
*
*
* int read_socket(int fd, char *buf, size_t size);
*
* read maximum size chars into buf
* returns n byte read, 0 on timeout, -1 on error
*
*
* int read_socket_match(int fd, char *buf, size_t size, char *match);
*
* read maximum size chars into buf and check if the start of line
* matches 'match'
* returns n on successful match, 0 on timeout/mismatch, -1 on error
*
*
* int write_socket(int fd, char *string);
*
* write string to socket fd
* returns n byte written, -1 on error
*
* with debuglevel 3, traffic on socket is logged
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include "debug.h"
#define TIMEOUT 5 /* 5 seconds timeout */
static char *quotemeta (char *string)
{
static char buffer[256];
char *s, *p;
p=buffer;
for (s=string; *s; s++) {
if (isprint(*s)) {
*p++=*s;
} else {
switch (*s) {
case '\r':
*p++='\\';
*p++='r';
break;
case '\n':
*p++='\\';
*p++='n';
break;
default:
p+=sprintf(p, "<\\%03o>", (int)*s);
}
}
if ((p-buffer)>240) {
*p++='.';
*p++='.';
*p++='.';
break;
}
}
*p='\0';
return buffer;
}
static char *del_pass(char *s)
{
char *p;
/* del pop3 pass from log */
if (memcmp(s, "PASS ", 5) == 0)
for (p = s+5; *p && *p != '\r'; p++)
*p = '*';
/* del imap4 pass from log */
else if (memcmp(s, ". LOGIN", 7) == 0)
for (p = s + strlen(s)-3 ; p > s && *p != ' '; p--)
*p = '*';
return s;
}
static void sockdebug (char dir, int len, char *string) {
// delete passwords from log
if (dir=='>') {
del_pass (string);
}
message (3, "%c[%2d] %s", dir, len, quotemeta(string));
}
int open_socket(char *machine, int port)
{
struct hostent *addr;
struct sockaddr_in s;
int fd;
addr = gethostbyname (machine);
if (addr)
memcpy (&s.sin_addr, addr->h_addr, sizeof (struct in_addr));
else
return -1;
fd = socket (AF_INET, SOCK_STREAM, 0);
if (fd < 0)
return -1;
s.sin_family = AF_INET;
s.sin_port = htons (port);
if (connect (fd, (struct sockaddr *)&s, sizeof (s)) < 0)
return -1;
return fd;
}
int read_socket(int fd, char *buf, size_t size)
{
fd_set readfds;
struct timeval tv;
int n;
FD_ZERO(&readfds);
FD_SET(fd, &readfds);
tv.tv_sec = TIMEOUT;
tv.tv_usec = 0;
if (select(fd+1, &readfds, NULL, NULL, &tv) > 0)
n = read(fd, buf, size);
else
n = 0;
if (n >= 0)
buf[n] = '\0';
else
buf[0] = '\0';
sockdebug('<', n, buf);
return n;
}
int read_socket_match(int fd, char *buf, size_t size, char *match)
{
int n = read_socket(fd, buf, size);
int len;
if (n <= 0)
return n;
len = strlen(match);
if (n >= len && memcmp(buf, match, len) == 0)
return n;
return 0;
}
int write_socket(int fd, char *buf)
{
int n = write(fd, buf, strlen(buf));
sockdebug('>', n, del_pass(buf));
return n;
}
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