2 netutl.c -- some supporting network utility code
3 Copyright (C) 1998,99 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>
39 look for a connection associated with the given vpn ip,
40 return its connection structure
42 conn_list_t *lookup_conn(ip_t ip)
44 conn_list_t *p = conn_list;
46 /* Exact match suggested by James B. MacLean */
47 for(p = conn_list; p != NULL; p = p->next)
50 for(p = conn_list; p != NULL; p = p->next)
51 if((ip & p->vpn_mask) == (p->vpn_ip & p->vpn_mask))
58 free a queue and all of its elements
60 void destroy_queue(packet_queue_t *pq)
62 queue_element_t *p, *q;
64 for(p = pq->head; p != NULL; p = q)
77 free a conn_list_t element and all its pointers
79 void free_conn_element(conn_list_t *p)
88 free_key(p->public_key);
95 remove all marked connections
97 void prune_conn_list(void)
99 conn_list_t *p, *prev = NULL, *next = NULL;
101 for(p = conn_list; p != NULL; )
112 free_conn_element(p);
123 creates new conn_list element, and initializes it
125 conn_list_t *new_conn_list(void)
127 conn_list_t *p = xmalloc(sizeof(*p));
129 /* initialise all those stupid pointers at once */
130 memset(p, '\0', sizeof(*p));
131 p->vpn_mask = (ip_t)(~0L); /* If this isn't done, it would be a
132 wastebucket for all packets with
133 unknown destination. */
140 free all elements of conn_list
142 void destroy_conn_list(void)
144 conn_list_t *p, *next;
146 for(p = conn_list; p != NULL; )
149 free_conn_element(p);
158 look up the name associated with the ip
161 char *hostlookup(unsigned long addr)
164 struct hostent *host = NULL;
169 host = gethostbyaddr((char *)&in, sizeof(in), AF_INET);
173 name = xmalloc(strlen(host->h_name)+20);
174 sprintf(name, "%s (%s)", host->h_name, inet_ntoa(in));
179 sprintf(name, "%s", inet_ntoa(in));
186 Turn a string into an IP addy with netmask
187 return NULL on failure
189 ip_mask_t *strtoip(char *str)
197 if((q = strchr(p, '/')))
200 q++; /* q now points to netmask part, or NULL if no mask */
203 if(!(h = gethostbyname(p)))
205 fprintf(stderr, "Error looking up `%s': %s\n", p, sys_errlist[h_errno]);
212 masker = strtol(q, &p, 10);
217 ip = xmalloc(sizeof(*ip));
218 ip->ip = ntohl(*((ip_t*)(h->h_addr_list[0])));
220 ip->mask = masker ? ~((1 << (32 - masker)) - 1) : 0;
225 void dump_conn_list(void)
229 syslog(LOG_DEBUG, "Connection list:");
231 for(p = conn_list; p != NULL; p = p->next)
233 syslog(LOG_DEBUG, " " IP_ADDR_S "/" IP_ADDR_S ": %04x (%d|%d)",
234 IP_ADDR_V(p->vpn_ip), IP_ADDR_V(p->vpn_mask), p->status,
235 p->socket, p->meta_socket);