e4f3d93ec6
- Add "salt" to the beginning of UDP packets. Replaces length field which is not useful anyway.
115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/*
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netutl.c -- some supporting network utility code
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Copyright (C) 1998-2001 Ivo Timmermans <itimmermans@bigfoot.com>
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2000,2001 Guus Sliepen <guus@sliepen.warande.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id: netutl.c,v 1.12.4.19 2001/05/07 19:08:46 guus Exp $
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*/
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#include "config.h"
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <syslog.h>
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#include <utils.h>
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#include <xalloc.h>
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#include "errno.h"
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#include "conf.h"
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#include "net.h"
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#include "netutl.h"
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#include "system.h"
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char *hostlookup(unsigned long addr)
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{
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char *name;
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struct hostent *host = NULL;
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struct in_addr in;
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config_t const *cfg;
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int lookup_hostname;
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cp
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in.s_addr = addr;
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lookup_hostname = 0;
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if((cfg = get_config_val(config, config_hostnames)) != NULL)
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if(cfg->data.val == stupid_true)
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lookup_hostname = 1;
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if(lookup_hostname)
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host = gethostbyaddr((char *)&in, sizeof(in), AF_INET);
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if(!lookup_hostname || !host)
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{
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asprintf(&name, "%s", inet_ntoa(in));
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}
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else
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{
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asprintf(&name, "%s", host->h_name);
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}
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cp
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return name;
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}
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/*
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Turn a string into an IP addy with netmask
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return NULL on failure
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*/
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ip_mask_t *strtoip(char *str)
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{
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ip_mask_t *ip;
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int masker;
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char *q, *p;
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struct hostent *h;
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cp
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p = str;
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if((q = strchr(p, '/')))
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{
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*q = '\0';
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q++; /* q now points to netmask part, or NULL if no mask */
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}
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if(!(h = gethostbyname(p)))
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{
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if(debug_lvl >= DEBUG_ERROR)
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syslog(LOG_WARNING, _("Error looking up `%s': %s\n"), p, strerror(errno));
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return NULL;
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}
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masker = 0;
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if(q)
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{
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masker = strtol(q, &p, 10);
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if(q == p || (*p))
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return NULL;
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}
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ip = xmalloc(sizeof(*ip));
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ip->address = ntohl(*((ipv4_t*)(h->h_addr_list[0])));
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ip->mask = masker ? ~((1 << (32 - masker)) - 1) : 0;
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cp
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return ip;
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}
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