2 netutl.c -- some supporting network utility code
3 Copyright (C) 1998,1999,2000 Ivo Timmermans <zarq@iname.com>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <arpa/inet.h>
24 #include <netinet/in.h>
28 #include <sys/socket.h>
41 look for a connection associated with the given vpn ip,
42 return its connection structure.
43 Skips connections that are not activated!
45 conn_list_t *lookup_conn(ip_t ip)
47 conn_list_t *p = conn_list;
49 /* Exact match suggested by James B. MacLean */
50 for(p = conn_list; p != NULL; p = p->next)
51 if((ip == p->vpn_ip) && p->status.active)
53 for(p = conn_list; p != NULL; p = p->next)
54 if(((ip & p->vpn_mask) == (p->vpn_ip & p->vpn_mask)) && p->status.active)
61 free a queue and all of its elements
63 void destroy_queue(packet_queue_t *pq)
65 queue_element_t *p, *q;
67 for(p = pq->head; p != NULL; p = q)
80 free a conn_list_t element and all its pointers
82 void free_conn_element(conn_list_t *p)
91 free_key(p->public_key);
98 remove all marked connections
100 void prune_conn_list(void)
102 conn_list_t *p, *prev = NULL, *next = NULL;
104 for(p = conn_list; p != NULL; )
115 free_conn_element(p);
126 creates new conn_list element, and initializes it
128 conn_list_t *new_conn_list(void)
130 conn_list_t *p = xmalloc(sizeof(*p));
132 /* initialise all those stupid pointers at once */
133 memset(p, '\0', sizeof(*p));
134 p->vpn_mask = (ip_t)(~0L); /* If this isn't done, it would be a
135 wastebucket for all packets with
136 unknown destination. */
143 free all elements of conn_list
145 void destroy_conn_list(void)
147 conn_list_t *p, *next;
149 for(p = conn_list; p != NULL; )
152 free_conn_element(p);
161 look up the name associated with the ip
164 char *hostlookup(unsigned long addr)
167 struct hostent *host = NULL;
172 host = gethostbyaddr((char *)&in, sizeof(in), AF_INET);
176 name = xmalloc(strlen(host->h_name)+20);
177 sprintf(name, "%s (%s)", host->h_name, inet_ntoa(in));
182 sprintf(name, "%s", inet_ntoa(in));
189 Turn a string into an IP addy with netmask
190 return NULL on failure
192 ip_mask_t *strtoip(char *str)
200 if((q = strchr(p, '/')))
203 q++; /* q now points to netmask part, or NULL if no mask */
206 if(!(h = gethostbyname(p)))
208 fprintf(stderr, _("Error looking up `%s': %s\n"), p, sys_errlist[h_errno]);
215 masker = strtol(q, &p, 10);
220 ip = xmalloc(sizeof(*ip));
221 ip->ip = ntohl(*((ip_t*)(h->h_addr_list[0])));
223 ip->mask = masker ? ~((1 << (32 - masker)) - 1) : 0;
228 void dump_conn_list(void)
232 syslog(LOG_DEBUG, _("Connection list:"));
234 for(p = conn_list; p != NULL; p = p->next)
236 syslog(LOG_DEBUG, " " IP_ADDR_S "/" IP_ADDR_S ": %04x (%d|%d)",
237 IP_ADDR_V(p->vpn_ip), IP_ADDR_V(p->vpn_mask), p->status,
238 p->socket, p->meta_socket);