/*
netutl.c -- some supporting network utility code
- Copyright (C) 1998,1999,2000 Ivo Timmermans <itimmermans@bigfoot.com>
+ Copyright (C) 1998-2005 Ivo Timmermans
+ 2000-2006 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: netutl.c,v 1.12.4.7 2000/08/17 16:51:07 guus Exp $
+ $Id$
*/
-#include "config.h"
-
-#include <arpa/inet.h>
-#include <netdb.h>
-#include <netinet/in.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/socket.h>
-#include <syslog.h>
-
-#include <utils.h>
-#include <xalloc.h>
+#include "system.h"
-#include "conf.h"
-#include "encr.h"
#include "net.h"
#include "netutl.h"
+#include "logger.h"
+#include "utils.h"
+#include "xalloc.h"
-#include "system.h"
+bool hostnames = false;
/*
- look for a connection associated with the given vpn ip,
- return its connection structure.
- Skips connections that are not activated!
+ Turn a string into a struct addrinfo.
+ Return NULL on failure.
*/
-conn_list_t *lookup_conn(ip_t ip)
+struct addrinfo *str2addrinfo(const char *address, const char *service, int socktype)
{
- conn_list_t *p = conn_list;
-cp
- /* Exact match suggested by James B. MacLean */
- for(p = conn_list; p != NULL; p = p->next)
- if((ip == p->vpn_ip) && p->status.active)
- return p;
- for(p = conn_list; p != NULL; p = p->next)
- if(((ip & p->vpn_mask) == (p->vpn_ip & p->vpn_mask)) && p->status.active)
- return p;
-cp
- return NULL;
+ struct addrinfo *ai, hint = {0};
+ int err;
+
+ cp();
+
+ hint.ai_family = addressfamily;
+ hint.ai_socktype = socktype;
+
+ err = getaddrinfo(address, service, &hint, &ai);
+
+ if(err) {
+ logger(LOG_WARNING, _("Error looking up %s port %s: %s"), address,
+ service, gai_strerror(err));
+ return NULL;
+ }
+
+ return ai;
}
-/*
- free a queue and all of its elements
-*/
-void destroy_queue(packet_queue_t *pq)
+sockaddr_t str2sockaddr(const char *address, const char *port)
{
- queue_element_t *p, *q;
-cp
- for(p = pq->head; p != NULL; p = q)
- {
- q = p->next;
- if(p->packet)
- free(p->packet);
- free(p);
- }
-
- free(pq);
-cp
+ struct addrinfo *ai, hint = {0};
+ sockaddr_t result;
+ int err;
+
+ cp();
+
+ hint.ai_family = AF_UNSPEC;
+ hint.ai_flags = AI_NUMERICHOST;
+ hint.ai_socktype = SOCK_STREAM;
+
+ err = getaddrinfo(address, port, &hint, &ai);
+
+ if(err || !ai) {
+ ifdebug(SCARY_THINGS)
+ logger(LOG_DEBUG, "Unknown type address %s port %s", address, port);
+ result.sa.sa_family = AF_UNKNOWN;
+ result.unknown.address = xstrdup(address);
+ result.unknown.port = xstrdup(port);
+ return result;
+ }
+
+ memcpy(&result, ai->ai_addr, ai->ai_addrlen);
+ freeaddrinfo(ai);
+
+ return result;
}
-/*
- free a conn_list_t element and all its pointers
-*/
-void free_conn_element(conn_list_t *p)
+void sockaddr2str(const sockaddr_t *sa, char **addrstr, char **portstr)
{
-cp
- if(p->sq)
- destroy_queue(p->sq);
- if(p->rq)
- destroy_queue(p->rq);
- if(p->vpn_hostname)
- free(p->vpn_hostname);
- if(p->real_hostname)
- free(p->real_hostname);
- free_key(p->public_key);
- free_key(p->key);
- free(p);
-cp
+ char address[NI_MAXHOST];
+ char port[NI_MAXSERV];
+ char *scopeid;
+ int err;
+
+ cp();
+
+ if(sa->sa.sa_family == AF_UNKNOWN) {
+ *addrstr = xstrdup(sa->unknown.address);
+ *portstr = xstrdup(sa->unknown.port);
+ return;
+ }
+
+ err = getnameinfo(&sa->sa, SALEN(sa->sa), address, sizeof(address), port, sizeof(port), NI_NUMERICHOST | NI_NUMERICSERV);
+
+ if(err) {
+ logger(LOG_ERR, _("Error while translating addresses: %s"),
+ gai_strerror(err));
+ cp_trace();
+ raise(SIGFPE);
+ exit(0);
+ }
+
+ scopeid = strchr(address, '%');
+
+ if(scopeid)
+ *scopeid = '\0'; /* Descope. */
+
+ *addrstr = xstrdup(address);
+ *portstr = xstrdup(port);
}
-/*
- remove all marked connections
-*/
-void prune_conn_list(void)
+char *sockaddr2hostname(const sockaddr_t *sa)
{
- conn_list_t *p, *prev = NULL, *next = NULL;
-cp
- for(p = conn_list; p != NULL; )
- {
- next = p->next;
-
- if(p->status.remove)
- {
- if(prev)
- prev->next = next;
- else
- conn_list = next;
-
- free_conn_element(p);
+ char *str;
+ char address[NI_MAXHOST] = "unknown";
+ char port[NI_MAXSERV] = "unknown";
+ int err;
+
+ cp();
+
+ if(sa->sa.sa_family == AF_UNKNOWN) {
+ asprintf(&str, _("%s port %s"), sa->unknown.address, sa->unknown.port);
+ return str;
}
- else
- prev = p;
- p = next;
- }
-cp
+ err = getnameinfo(&sa->sa, SALEN(sa->sa), address, sizeof(address), port, sizeof(port),
+ hostnames ? 0 : (NI_NUMERICHOST | NI_NUMERICSERV));
+ if(err) {
+ logger(LOG_ERR, _("Error while looking up hostname: %s"),
+ gai_strerror(err));
+ }
+
+ asprintf(&str, _("%s port %s"), address, port);
+
+ return str;
}
-/*
- creates new conn_list element, and initializes it
-*/
-conn_list_t *new_conn_list(void)
+int sockaddrcmp(const sockaddr_t *a, const sockaddr_t *b)
{
- conn_list_t *p = xmalloc(sizeof(*p));
-cp
- /* initialise all those stupid pointers at once */
- memset(p, '\0', sizeof(*p));
- p->vpn_mask = (ip_t)(~0L); /* If this isn't done, it would be a
- wastebucket for all packets with
- unknown destination. */
- p->nexthop = p;
-cp
- return p;
+ int result;
+
+ cp();
+
+ result = a->sa.sa_family - b->sa.sa_family;
+
+ if(result)
+ return result;
+
+ switch (a->sa.sa_family) {
+ case AF_UNSPEC:
+ return 0;
+
+ case AF_UNKNOWN:
+ result = strcmp(a->unknown.address, b->unknown.address);
+
+ if(result)
+ return result;
+
+ return strcmp(a->unknown.port, b->unknown.port);
+
+ case AF_INET:
+ result = memcmp(&a->in.sin_addr, &b->in.sin_addr, sizeof(a->in.sin_addr));
+
+ if(result)
+ return result;
+
+ return memcmp(&a->in.sin_port, &b->in.sin_port, sizeof(a->in.sin_port));
+
+ case AF_INET6:
+ result = memcmp(&a->in6.sin6_addr, &b->in6.sin6_addr, sizeof(a->in6.sin6_addr));
+
+ if(result)
+ return result;
+
+ return memcmp(&a->in6.sin6_port, &b->in6.sin6_port, sizeof(a->in6.sin6_port));
+
+ default:
+ logger(LOG_ERR, _("sockaddrcmp() was called with unknown address family %d, exitting!"),
+ a->sa.sa_family);
+ cp_trace();
+ raise(SIGFPE);
+ exit(0);
+ }
}
-/*
- free all elements of conn_list
-*/
-void destroy_conn_list(void)
+void sockaddrcpy(sockaddr_t *a, const sockaddr_t *b) {
+ cp();
+
+ if(b->sa.sa_family != AF_UNKNOWN) {
+ *a = *b;
+ } else {
+ a->unknown.family = AF_UNKNOWN;
+ a->unknown.address = xstrdup(b->unknown.address);
+ a->unknown.port = xstrdup(b->unknown.port);
+ }
+}
+
+void sockaddrfree(sockaddr_t *a) {
+ cp();
+
+ if(a->sa.sa_family == AF_UNKNOWN) {
+ free(a->unknown.address);
+ free(a->unknown.port);
+ }
+}
+
+void sockaddrunmap(sockaddr_t *sa)
{
- conn_list_t *p, *next;
-cp
- for(p = conn_list; p != NULL; )
- {
- next = p->next;
- free_conn_element(p);
- p = next;
- }
-
- conn_list = NULL;
-cp
+ cp();
+
+ if(sa->sa.sa_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&sa->in6.sin6_addr)) {
+ sa->in.sin_addr.s_addr = ((uint32_t *) & sa->in6.sin6_addr)[3];
+ sa->in.sin_family = AF_INET;
+ }
}
-/*
- look up the name associated with the ip
- address `addr'
-*/
+/* Subnet mask handling */
-char *hostlookup(unsigned long addr)
+int maskcmp(const void *va, const void *vb, int masklen)
{
- char *name;
- struct hostent *host = NULL;
- struct in_addr in;
- config_t const *cfg;
- int lookup_hostname;
-cp
- in.s_addr = addr;
-
- lookup_hostname = 0;
- if((cfg = get_config_val(resolve_dns)) != NULL)
- if(cfg->data.val == stupid_true)
- lookup_hostname = 1;
-
- if(lookup_hostname)
- host = gethostbyaddr((char *)&in, sizeof(in), AF_INET);
-
- if(!lookup_hostname || !host)
- {
- asprintf(&name, "%s", inet_ntoa(in));
- }
- else
- {
- asprintf(&name, "%s", host->h_name);
- }
-cp
- return name;
+ int i, m, result;
+ const char *a = va;
+ const char *b = vb;
+
+ cp();
+
+ for(m = masklen, i = 0; m >= 8; m -= 8, i++) {
+ result = a[i] - b[i];
+ if(result)
+ return result;
+ }
+
+ if(m)
+ return (a[i] & (0x100 - (1 << (8 - m)))) -
+ (b[i] & (0x100 - (1 << (8 - m))));
+
+ return 0;
}
-/*
- Turn a string into an IP addy with netmask
- return NULL on failure
-*/
-ip_mask_t *strtoip(char *str)
+void mask(void *va, int masklen, int len)
+{
+ int i;
+ char *a = va;
+
+ cp();
+
+ i = masklen / 8;
+ masklen %= 8;
+
+ if(masklen)
+ a[i++] &= (0x100 - (1 << (8 - masklen)));
+
+ for(; i < len; i++)
+ a[i] = 0;
+}
+
+void maskcpy(void *va, const void *vb, int masklen, int len)
{
- ip_mask_t *ip;
- int masker;
- char *q, *p;
- struct hostent *h;
-cp
- p = str;
- if((q = strchr(p, '/')))
- {
- *q = '\0';
- q++; /* q now points to netmask part, or NULL if no mask */
- }
-
- if(!(h = gethostbyname(p)))
- {
- fprintf(stderr, _("Error looking up `%s': %s\n"), p, sys_errlist[h_errno]);
- return NULL;
- }
-
- masker = 0;
- if(q)
- {
- masker = strtol(q, &p, 10);
- if(q == p || (*p))
- return NULL;
- }
-
- ip = xmalloc(sizeof(*ip));
- ip->ip = ntohl(*((ip_t*)(h->h_addr_list[0])));
-
- ip->mask = masker ? ~((1 << (32 - masker)) - 1) : 0;
-cp
- return ip;
+ int i, m;
+ char *a = va;
+ const char *b = vb;
+
+ cp();
+
+ for(m = masklen, i = 0; m >= 8; m -= 8, i++)
+ a[i] = b[i];
+
+ if(m) {
+ a[i] = b[i] & (0x100 - (1 << (8 - m)));
+ i++;
+ }
+
+ for(; i < len; i++)
+ a[i] = 0;
}
-void dump_conn_list(void)
+bool maskcheck(const void *va, int masklen, int len)
{
- conn_list_t *p;
-cp
- syslog(LOG_DEBUG, _("Connection list:"));
-
- for(p = conn_list; p != NULL; p = p->next)
- {
- syslog(LOG_DEBUG, _("%s netmask %d.%d.%d.%d at %s port %hd flags %d sockets %d, %d status %04x"),
- p->vpn_hostname, IP_ADDR_V(p->vpn_mask), p->real_hostname, p->port, p->flags,
- p->socket, p->meta_socket, p->status);
- }
-cp
+ int i;
+ const char *a = va;
+
+ cp();
+
+ i = masklen / 8;
+ masklen %= 8;
+
+ if(masklen && a[i++] & (0xff >> masklen))
+ return false;
+
+ for(; i < len; i++)
+ if(a[i] != 0)
+ return false;
+
+ return true;
}
projects / tinc / blobdiff