/*
This file is part of GNUnet.
- (C) 2007, 2008, 2009 Christian Grothoff (and other contributing authors)
+ (C) 2007, 2008, 2009, 2012 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
* @author Christian Grothoff
*/
#include "platform.h"
-#include "gnunet_disk_lib.h"
-#include "gnunet_getopt_lib.h"
+#include "gnunet_util_lib.h"
#include "gnunet_protocols.h"
-#include "gnunet_service_lib.h"
#include "gnunet_statistics_service.h"
-#include "gnunet_strings_lib.h"
-#include "gnunet_time_lib.h"
#include "resolver.h"
/**
struct IPCache
{
/**
- * This is a linked list.
+ * This is a doubly linked list.
*/
struct IPCache *next;
+ /**
+ * This is a doubly linked list.
+ */
+ struct IPCache *prev;
+
/**
* Hostname in human-readable form.
*/
char *addr;
/**
- * Hostname in binary format.
+ * Binary IP address, allocated at the end of this struct.
*/
- struct sockaddr *sa;
+ const void *ip;
/**
* Last time this entry was updated.
struct GNUNET_TIME_Absolute last_request;
/**
- * Number of bytes in sa.
+ * Number of bytes in ip.
+ */
+ size_t ip_len;
+
+ /**
+ * Address family of the IP.
*/
- socklen_t salen;
+ int af;
};
/**
* Start of the linked list of cached DNS lookup results.
*/
-static struct IPCache *head;
+static struct IPCache *cache_head;
+
+/**
+ * Tail of the linked list of cached DNS lookup results.
+ */
+static struct IPCache *cache_tail;
#if HAVE_GETNAMEINFO
getnameinfo_resolve (struct IPCache *cache)
{
char hostname[256];
+ const struct sockaddr *sa;
+ struct sockaddr_in v4;
+ struct sockaddr_in6 v6;
+ size_t salen;
- if (0 == getnameinfo (cache->sa,
- cache->salen, hostname, sizeof (hostname), NULL, 0, 0))
+ switch (cache->af)
+ {
+ case AF_INET:
+ GNUNET_assert (cache->ip_len == sizeof (struct in_addr));
+ sa = (const struct sockaddr*) &v4;
+ memset (&v4, 0, sizeof (v4));
+ v4.sin_addr = * (const struct in_addr*) cache->ip;
+ v4.sin_family = AF_INET;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ v4.sin_len = sizeof (v4);
+#endif
+ salen = sizeof (v4);
+ break;
+ case AF_INET6:
+ GNUNET_assert (cache->ip_len == sizeof (struct in6_addr));
+ sa = (const struct sockaddr*) &v6;
+ memset (&v6, 0, sizeof (v6));
+ v6.sin6_addr = * (const struct in6_addr*) cache->ip;
+ v6.sin6_family = AF_INET6;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ v6.sin6_len = sizeof (v6);
+#endif
+ salen = sizeof (v6);
+ break;
+ default:
+ GNUNET_assert (0);
+ }
+
+ if (0 ==
+ getnameinfo (sa, salen, hostname, sizeof (hostname), NULL,
+ 0, 0))
cache->addr = GNUNET_strdup (hostname);
}
#endif
{
struct hostent *ent;
- switch (cache->sa->sa_family)
- {
- case AF_INET:
- ent = gethostbyaddr (&((struct sockaddr_in *) cache->sa)->sin_addr,
- sizeof (struct in_addr), AF_INET);
- break;
- case AF_INET6:
- ent = gethostbyaddr (&((struct sockaddr_in6 *) cache->sa)->sin6_addr,
- sizeof (struct in6_addr), AF_INET6);
- break;
- default:
- ent = NULL;
- }
+ ent = gethostbyaddr (cache->ip,
+ cache->ip_len,
+ cache->af);
if (ent != NULL)
cache->addr = GNUNET_strdup (ent->h_name);
}
#endif
+
/**
* Resolve the given request using the available methods.
*
}
-
/**
* Get an IP address as a string (works for both IPv4 and IPv6). Note
* that the resolution happens asynchronously and that the first call
* human-readable IP address).
*
* @param client handle to the client making the request (for sending the reply)
- * @param sa should be of type "struct sockaddr*"
- * @param salen number of bytes in sa
+ * @param af AF_INET or AF_INET6
+ * @param ip 'struct in_addr' or 'struct in6_addr'
*/
static void
get_ip_as_string (struct GNUNET_SERVER_Client *client,
- const struct sockaddr *sa, socklen_t salen)
+ int af,
+ const void *ip)
{
- struct IPCache *cache;
- struct IPCache *prev;
+ struct IPCache *pos;
+ struct IPCache *next;
struct GNUNET_TIME_Absolute now;
struct GNUNET_SERVER_TransmitContext *tc;
+ size_t ip_len;
- if (salen < sizeof (struct sockaddr))
+ switch (af)
{
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
+ case AF_INET:
+ ip_len = sizeof (struct in_addr);
+ break;
+ case AF_INET6:
+ ip_len = sizeof (struct in6_addr);
+ break;
+ default:
+ GNUNET_assert (0);
}
now = GNUNET_TIME_absolute_get ();
- cache = head;
- prev = NULL;
- while ((cache != NULL) &&
- ((cache->salen != salen) || (0 != memcmp (cache->sa, sa, salen))))
+ next = cache_head;
+ while ( (NULL != (pos = next)) &&
+ ( (pos->af != af) ||
+ (pos->ip_len != ip_len) ||
+ (0 != memcmp (pos->ip, ip, ip_len))) )
{
- if (GNUNET_TIME_absolute_get_duration (cache->last_request).rel_value <
+ next = pos->next;
+ if (GNUNET_TIME_absolute_get_duration (pos->last_request).rel_value <
60 * 60 * 1000)
{
- if (prev != NULL)
- {
- prev->next = cache->next;
- GNUNET_free_non_null (cache->addr);
- GNUNET_free (cache->sa);
- GNUNET_free (cache);
- cache = prev->next;
- }
- else
- {
- head = cache->next;
- GNUNET_free_non_null (cache->addr);
- GNUNET_free (cache->sa);
- GNUNET_free (cache);
- cache = head;
- }
+ GNUNET_CONTAINER_DLL_remove (cache_head,
+ cache_tail,
+ pos);
+ GNUNET_free_non_null (pos->addr);
+ GNUNET_free (pos);
continue;
}
- prev = cache;
- cache = cache->next;
}
- if (cache != NULL)
+ if (pos != NULL)
{
- cache->last_request = now;
- if (GNUNET_TIME_absolute_get_duration (cache->last_request).rel_value <
+ pos->last_request = now;
+ if (GNUNET_TIME_absolute_get_duration (pos->last_request).rel_value <
60 * 60 * 1000)
{
- GNUNET_free_non_null (cache->addr);
- cache->addr = NULL;
- cache->salen = 0;
- cache_resolve (cache);
+ GNUNET_free_non_null (pos->addr);
+ pos->addr = NULL;
+ cache_resolve (pos);
}
}
else
{
- cache = GNUNET_malloc (sizeof (struct IPCache));
- cache->next = head;
- cache->salen = salen;
- cache->sa = GNUNET_malloc (salen);
- memcpy (cache->sa, sa, salen);
- cache->last_request = GNUNET_TIME_absolute_get ();
- cache->last_refresh = GNUNET_TIME_absolute_get ();
- cache->addr = NULL;
- cache_resolve (cache);
- head = cache;
+ pos = GNUNET_malloc (sizeof (struct IPCache) + ip_len);
+ pos->ip = &pos[1];
+ memcpy (&pos[1], ip, ip_len);
+ pos->last_request = now;
+ pos->last_refresh = now;
+ pos->ip_len = ip_len;
+ pos->af = af;
+ GNUNET_CONTAINER_DLL_insert (cache_head,
+ cache_tail,
+ pos);
+ cache_resolve (pos);
}
tc = GNUNET_SERVER_transmit_context_create (client);
- if (cache->addr != NULL)
- GNUNET_SERVER_transmit_context_append_data (tc,
- cache->addr,
- strlen (cache->addr) + 1,
+ if (pos->addr != NULL)
+ GNUNET_SERVER_transmit_context_append_data (tc, pos->addr,
+ strlen (pos->addr) + 1,
GNUNET_MESSAGE_TYPE_RESOLVER_RESPONSE);
GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
GNUNET_MESSAGE_TYPE_RESOLVER_RESPONSE);
#if HAVE_GETADDRINFO
static int
getaddrinfo_resolve (struct GNUNET_SERVER_TransmitContext *tc,
- const char *hostname, int domain)
+ const char *hostname, int af)
{
int s;
struct addrinfo hints;
memset (&hints, 0, sizeof (struct addrinfo));
// FIXME in PlibC
#ifndef MINGW
- hints.ai_family = domain;
+ hints.ai_family = af;
#else
hints.ai_family = AF_INET;
#endif
if (0 != (s = getaddrinfo (hostname, NULL, &hints, &result)))
{
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("Could not resolve `%s' (%s): %s\n"), hostname,
- (domain ==
- AF_INET) ? "IPv4" : ((domain ==
- AF_INET6) ? "IPv6" : "any"),
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO, _("Could not resolve `%s' (%s): %s\n"),
+ hostname,
+ (af ==
+ AF_INET) ? "IPv4" : ((af == AF_INET6) ? "IPv6" : "any"),
gai_strerror (s));
if ((s == EAI_BADFLAGS) || (s == EAI_MEMORY)
#ifndef MINGW
pos = result;
while (pos != NULL)
{
- GNUNET_SERVER_transmit_context_append_data (tc,
- pos->ai_addr,
- pos->ai_addrlen,
- GNUNET_MESSAGE_TYPE_RESOLVER_RESPONSE);
+ switch (pos->ai_family)
+ {
+ case AF_INET:
+ GNUNET_SERVER_transmit_context_append_data (tc,
+ &((struct sockaddr_in*) pos->ai_addr)->sin_addr,
+ sizeof (struct in_addr),
+ GNUNET_MESSAGE_TYPE_RESOLVER_RESPONSE);
+ break;
+ case AF_INET6:
+ GNUNET_SERVER_transmit_context_append_data (tc,
+ &((struct sockaddr_in6*) pos->ai_addr)->sin6_addr,
+ sizeof (struct in6_addr),
+ GNUNET_MESSAGE_TYPE_RESOLVER_RESPONSE);
+ break;
+ default:
+ /* unsupported, skip */
+ break;
+ }
pos = pos->ai_next;
}
freeaddrinfo (result);
}
#endif
+
#if HAVE_GETHOSTBYNAME2
static int
gethostbyname2_resolve (struct GNUNET_SERVER_TransmitContext *tc,
- const char *hostname, int domain)
+ const char *hostname, int af)
{
struct hostent *hp;
- struct sockaddr_in a4;
- struct sockaddr_in6 a6;
int ret1;
int ret2;
- if (domain == AF_UNSPEC)
+ if (af == AF_UNSPEC)
{
ret1 = gethostbyname2_resolve (tc, hostname, AF_INET);
ret2 = gethostbyname2_resolve (tc, hostname, AF_INET6);
return GNUNET_SYSERR;
return GNUNET_NO;
}
- hp = gethostbyname2 (hostname, domain);
+ hp = gethostbyname2 (hostname, af);
if (hp == NULL)
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("Could not find IP of host `%s': %s\n"),
- hostname, hstrerror (h_errno));
+ _("Could not find IP of host `%s': %s\n"), hostname,
+ hstrerror (h_errno));
return GNUNET_SYSERR;
}
- GNUNET_assert (hp->h_addrtype == domain);
- if (domain == AF_INET)
+ GNUNET_assert (hp->h_addrtype == af);
+ switch (af)
{
+ case AF_INET:
GNUNET_assert (hp->h_length == sizeof (struct in_addr));
- memset (&a4, 0, sizeof (a4));
- a4.sin_family = AF_INET;
-#if HAVE_SOCKADDR_IN_SIN_LEN
- a4.sin_len = (u_char) sizeof (struct sockaddr_in);
-#endif
- memcpy (&a4.sin_addr, hp->h_addr_list[0], hp->h_length);
- GNUNET_SERVER_transmit_context_append_data (tc,
- &a4,
- sizeof (a4),
+ GNUNET_SERVER_transmit_context_append_data (tc,
+ hp->h_addr_list[0],
+ hp->h_length,
GNUNET_MESSAGE_TYPE_RESOLVER_RESPONSE);
- }
- else
- {
+ break;
+ case AF_INET6:
GNUNET_assert (hp->h_length == sizeof (struct in6_addr));
- memset (&a6, 0, sizeof (a6));
- a6.sin6_family = AF_INET6;
-#if HAVE_SOCKADDR_IN_SIN_LEN
- a6.sin6_len = (u_char) sizeof (struct sockaddr_in6);
-#endif
- memcpy (&a6.sin6_addr, hp->h_addr_list[0], hp->h_length);
- GNUNET_SERVER_transmit_context_append_data (tc,
- &a6,
- sizeof (a6),
+ GNUNET_SERVER_transmit_context_append_data (tc,
+ hp->h_addr_list[0],
+ hp->h_length,
GNUNET_MESSAGE_TYPE_RESOLVER_RESPONSE);
+ break;
+ default:
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
}
return GNUNET_OK;
}
#endif
+
#if HAVE_GETHOSTBYNAME
static int
gethostbyname_resolve (struct GNUNET_SERVER_TransmitContext *tc,
const char *hostname)
{
struct hostent *hp;
- struct sockaddr_in addr;
hp = GETHOSTBYNAME (hostname);
if (hp == NULL)
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("Could not find IP of host `%s': %s\n"),
- hostname, hstrerror (h_errno));
+ _("Could not find IP of host `%s': %s\n"), hostname,
+ hstrerror (h_errno));
return GNUNET_SYSERR;
}
if (hp->h_addrtype != AF_INET)
return GNUNET_SYSERR;
}
GNUNET_assert (hp->h_length == sizeof (struct in_addr));
- memset (&addr, 0, sizeof (addr));
- addr.sin_family = AF_INET;
-#if HAVE_SOCKADDR_IN_SIN_LEN
- addr.sin_len = (u_char) sizeof (struct sockaddr_in);
-#endif
- memcpy (&addr.sin_addr, hp->h_addr_list[0], hp->h_length);
- GNUNET_SERVER_transmit_context_append_data (tc,
- &addr,
- sizeof (addr),
+ GNUNET_SERVER_transmit_context_append_data (tc,
+ hp->h_addr_list[0],
+ hp->h_length,
GNUNET_MESSAGE_TYPE_RESOLVER_RESPONSE);
return GNUNET_OK;
}
*
* @param client where to send the IP address
* @param hostname the hostname to resolve
- * @param domain AF_INET or AF_INET6; use AF_UNSPEC for "any"
+ * @param af AF_INET or AF_INET6; use AF_UNSPEC for "any"
*/
static void
-get_ip_from_hostname (struct GNUNET_SERVER_Client *client,
- const char *hostname, int domain)
+get_ip_from_hostname (struct GNUNET_SERVER_Client *client, const char *hostname,
+ int af)
{
int ret;
struct GNUNET_SERVER_TransmitContext *tc;
ret = GNUNET_NO;
#if HAVE_GETADDRINFO
if (ret == GNUNET_NO)
- ret = getaddrinfo_resolve (tc, hostname, domain);
+ ret = getaddrinfo_resolve (tc, hostname, af);
#endif
#if HAVE_GETHOSTBYNAME2
if (ret == GNUNET_NO)
- ret = gethostbyname2_resolve (tc, hostname, domain);
+ ret = gethostbyname2_resolve (tc, hostname, af);
#endif
#if HAVE_GETHOSTBYNAME
- if ((ret == GNUNET_NO) && ((domain == AF_UNSPEC) || (domain == PF_INET)))
+ if ((ret == GNUNET_NO) && ((af == AF_UNSPEC) || (af == PF_INET)))
gethostbyname_resolve (tc, hostname);
#endif
GNUNET_SERVER_transmit_context_append_data (tc, NULL, 0,
* @param message the actual message
*/
static void
-handle_get (void *cls,
- struct GNUNET_SERVER_Client *client,
+handle_get (void *cls, struct GNUNET_SERVER_Client *client,
const struct GNUNET_MessageHeader *message)
{
uint16_t msize;
const struct GNUNET_RESOLVER_GetMessage *msg;
- const char *hostname;
- const struct sockaddr *sa;
+ const void *ip;
uint16_t size;
int direction;
- int domain;
+ int af;
msize = ntohs (message->size);
if (msize < sizeof (struct GNUNET_RESOLVER_GetMessage))
msg = (const struct GNUNET_RESOLVER_GetMessage *) message;
size = msize - sizeof (struct GNUNET_RESOLVER_GetMessage);
direction = ntohl (msg->direction);
- domain = ntohl (msg->domain);
+ af = ntohl (msg->af);
if (direction == GNUNET_NO)
{
/* IP from hostname */
+ const char *hostname;
+
hostname = (const char *) &msg[1];
if (hostname[size - 1] != '\0')
{
GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
return;
}
-#if DEBUG_RESOLVER
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Resolver asked to look up `%s'.\n"), hostname);
-#endif
- get_ip_from_hostname (client, hostname, domain);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Resolver asked to look up `%s'.\n",
+ hostname);
+ get_ip_from_hostname (client, hostname, af);
+ return;
}
- else
+ ip = &msg[1];
+ switch (af)
{
-#if DEBUG_RESOLVER
- char buf[INET6_ADDRSTRLEN];
-#endif
- if (size < sizeof (struct sockaddr))
+ case AF_INET:
+ if (size != sizeof (struct in_addr))
{
GNUNET_break (0);
GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
return;
}
- sa = (const struct sockaddr *) &msg[1];
- switch (sa->sa_family)
+ break;
+ case AF_INET6:
+ if (size != sizeof (struct in6_addr))
{
- case AF_INET:
- if (size != sizeof (struct sockaddr_in))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
-#if DEBUG_RESOLVER
- inet_ntop (AF_INET, sa, buf, size);
-#endif
- break;
- case AF_INET6:
- if (size != sizeof (struct sockaddr_in6))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
-#if DEBUG_RESOLVER
- inet_ntop (AF_INET6, sa, buf, size);
-#endif
- break;
- default:
GNUNET_break (0);
GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
return;
}
-#if DEBUG_RESOLVER
+ break;
+ default:
+ GNUNET_break (0);
+ GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
+ return;
+ }
+ {
+ char buf[INET6_ADDRSTRLEN];
+
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Resolver asked to look up IP address `%s'.\n"), buf);
-#endif
- get_ip_as_string (client, sa, size);
+ "Resolver asked to look up IP address `%s'.\n",
+ inet_ntop (af, ip, buf, sizeof (buf)));
}
+ get_ip_as_string (client, af, ip);
}
* @param cfg configuration to use
*/
static void
-run (void *cls,
- struct GNUNET_SERVER_Handle *server,
+run (void *cls, struct GNUNET_SERVER_Handle *server,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
static const struct GNUNET_SERVER_MessageHandler handlers[] = {
int
main (int argc, char *const *argv)
{
- int ret;
struct IPCache *pos;
+ int ret;
- ret = (GNUNET_OK ==
- GNUNET_SERVICE_run (argc,
- argv,
- "resolver", GNUNET_SERVICE_OPTION_NONE,
- &run, NULL)) ? 0 : 1;
-
- while (head != NULL)
+ ret =
+ (GNUNET_OK ==
+ GNUNET_SERVICE_run (argc, argv, "resolver", GNUNET_SERVICE_OPTION_NONE,
+ &run, NULL)) ? 0 : 1;
+ while (NULL != (pos = cache_head))
{
- pos = head->next;
- GNUNET_free_non_null (head->addr);
- GNUNET_free (head->sa);
- GNUNET_free (head);
- head = pos;
+ GNUNET_CONTAINER_DLL_remove (cache_head,
+ cache_tail,
+ pos);
+ GNUNET_free_non_null (pos->addr);
+ GNUNET_free (pos);
}
return ret;
}
+#ifdef LINUX
+#include <malloc.h>
+
+/**
+ * MINIMIZE heap size (way below 128k) since this process doesn't need much.
+ */
+void __attribute__ ((constructor)) GNUNET_ARM_memory_init ()
+{
+ mallopt (M_TRIM_THRESHOLD, 4 * 1024);
+ mallopt (M_TOP_PAD, 1 * 1024);
+ malloc_trim (0);
+}
+#endif
+
+
/* end of gnunet-service-resolver.c */
projects / oweals / gnunet.git / blobdiff