+++ /dev/null
-/*
-
- id.c
-
- Author: Pekka Riikonen <priikone@silcnet.org>
-
- Copyright (C) 1997 - 2008 Pekka Riikonen
-
- 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
- the Free Software Foundation; version 2 of the License.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
-*/
-/* $Id$ */
-
-#include "silc.h"
-#include "silcid.h"
-
-/* ID lengths (in bytes) without the IP address part */
-#define ID_SERVER_LEN_PART 4
-#define ID_CLIENT_LEN_PART CLIENTID_HASH_LEN + 1
-#define ID_CHANNEL_LEN_PART 4
-
-/******************************************************************************
-
- ID Payload
-
-******************************************************************************/
-
-struct SilcIDPayloadStruct {
- SilcIdType type;
- SilcUInt16 len;
- unsigned char *id;
-};
-
-/* Parses buffer and return ID payload into payload structure */
-
-SilcIDPayload silc_id_payload_parse(const unsigned char *payload,
- SilcUInt32 payload_len)
-{
- SilcBufferStruct buffer;
- SilcIDPayload newp;
- int ret;
-
- silc_buffer_set(&buffer, (unsigned char *)payload, payload_len);
- newp = silc_calloc(1, sizeof(*newp));
- if (!newp)
- return NULL;
-
- ret = silc_buffer_unformat(&buffer,
- SILC_STR_UI_SHORT(&newp->type),
- SILC_STR_UI_SHORT(&newp->len),
- SILC_STR_END);
- if (ret == -1)
- goto err;
-
- if (newp->type > SILC_ID_CHANNEL)
- goto err;
-
- silc_buffer_pull(&buffer, 4);
-
- if (newp->len > silc_buffer_len(&buffer) ||
- newp->len > SILC_PACKET_MAX_ID_LEN)
- goto err;
-
- ret = silc_buffer_unformat(&buffer,
- SILC_STR_DATA_ALLOC(&newp->id, newp->len),
- SILC_STR_END);
- if (ret == -1)
- goto err;
-
- return newp;
-
- err:
- SILC_LOG_DEBUG(("Error parsing ID payload"));
- silc_free(newp);
- return NULL;
-}
-
-/* Return the ID directly from the raw payload data. */
-
-SilcBool silc_id_payload_parse_id(const unsigned char *data, SilcUInt32 len,
- SilcID *ret_id)
-{
- SilcBufferStruct buffer;
- SilcIdType type;
- SilcUInt16 idlen;
- unsigned char *id_data;
- int ret;
-
- if (!ret_id)
- return FALSE;
-
- silc_buffer_set(&buffer, (unsigned char *)data, len);
- ret = silc_buffer_unformat(&buffer,
- SILC_STR_UI_SHORT(&type),
- SILC_STR_UI_SHORT(&idlen),
- SILC_STR_END);
- if (ret == -1)
- goto err;
-
- if (type > SILC_ID_CHANNEL)
- goto err;
-
- silc_buffer_pull(&buffer, 4);
-
- if (idlen > silc_buffer_len(&buffer) || idlen > SILC_PACKET_MAX_ID_LEN)
- goto err;
-
- ret = silc_buffer_unformat(&buffer,
- SILC_STR_DATA(&id_data, idlen),
- SILC_STR_END);
- if (ret == -1)
- goto err;
-
- ret_id->type = type;
-
- if (type == SILC_ID_CLIENT) {
- if (!silc_id_str2id(id_data, idlen, type, &ret_id->u.client_id,
- sizeof(SilcClientID)))
- goto err;
- } else if (type == SILC_ID_SERVER) {
- if (!silc_id_str2id(id_data, idlen, type, &ret_id->u.server_id,
- sizeof(SilcServerID)))
- goto err;
- } else {
- if (!silc_id_str2id(id_data, idlen, type, &ret_id->u.channel_id,
- sizeof(SilcChannelID)))
- goto err;
- }
-
- return TRUE;
-
- err:
- SILC_LOG_DEBUG(("Error parsing ID payload"));
- return FALSE;
-}
-
-/* Encodes ID Payload */
-
-SilcBuffer silc_id_payload_encode(const void *id, SilcIdType type)
-{
- SilcBuffer buffer;
- unsigned char id_data[32];
- SilcUInt32 len;
-
- if (!silc_id_id2str(id, type, id_data, sizeof(id_data), &len))
- return NULL;
- buffer = silc_id_payload_encode_data((const unsigned char *)id_data,
- len, type);
- return buffer;
-}
-
-SilcBuffer silc_id_payload_encode_data(const unsigned char *id,
- SilcUInt32 id_len, SilcIdType type)
-{
- SilcBuffer buffer;
-
- buffer = silc_buffer_alloc_size(4 + id_len);
- if (!buffer)
- return NULL;
- silc_buffer_format(buffer,
- SILC_STR_UI_SHORT(type),
- SILC_STR_UI_SHORT(id_len),
- SILC_STR_DATA(id, id_len),
- SILC_STR_END);
- return buffer;
-}
-
-/* Free ID Payload */
-
-void silc_id_payload_free(SilcIDPayload payload)
-{
- if (payload) {
- silc_free(payload->id);
- silc_free(payload);
- }
-}
-
-/* Get ID type */
-
-SilcIdType silc_id_payload_get_type(SilcIDPayload payload)
-{
- return payload ? payload->type : 0;
-}
-
-/* Get ID */
-
-SilcBool silc_id_payload_get_id(SilcIDPayload payload, void *ret_id,
- SilcUInt32 ret_id_len)
-{
- if (!payload)
- return FALSE;
- return silc_id_str2id(payload->id, payload->len, payload->type,
- ret_id, ret_id_len);
-}
-
-/* Get raw ID data. Data is duplicated. */
-
-unsigned char *silc_id_payload_get_data(SilcIDPayload payload)
-{
- if (!payload)
- return NULL;
-
- return silc_memdup(payload->id, payload->len);
-}
-
-/* Get length of ID */
-
-SilcUInt32 silc_id_payload_get_len(SilcIDPayload payload)
-{
- return payload ? payload->len : 0;
-}
-
-/* Converts ID to string. */
-
-SilcBool silc_id_id2str(const void *id, SilcIdType type,
- unsigned char *ret_id, SilcUInt32 ret_id_size,
- SilcUInt32 *ret_id_len)
-{
- SilcServerID *server_id;
- SilcClientID *client_id;
- SilcChannelID *channel_id;
- SilcUInt32 id_len = silc_id_get_len(id, type);
-
- if (id_len > ret_id_size)
- return FALSE;
-
- if (ret_id_len)
- *ret_id_len = id_len;
-
- if (id_len > SILC_PACKET_MAX_ID_LEN)
- return FALSE;
-
- switch(type) {
- case SILC_ID_SERVER:
- server_id = (SilcServerID *)id;
- memcpy(ret_id, server_id->ip.data, server_id->ip.data_len);
- SILC_PUT16_MSB(server_id->port, &ret_id[server_id->ip.data_len]);
- SILC_PUT16_MSB(server_id->rnd, &ret_id[server_id->ip.data_len + 2]);
- return TRUE;
- break;
- case SILC_ID_CLIENT:
- client_id = (SilcClientID *)id;
- memcpy(ret_id, client_id->ip.data, client_id->ip.data_len);
- ret_id[client_id->ip.data_len] = client_id->rnd;
- memcpy(&ret_id[client_id->ip.data_len + 1], client_id->hash,
- CLIENTID_HASH_LEN);
- return TRUE;
- break;
- case SILC_ID_CHANNEL:
- channel_id = (SilcChannelID *)id;
- memcpy(ret_id, channel_id->ip.data, channel_id->ip.data_len);
- SILC_PUT16_MSB(channel_id->port, &ret_id[channel_id->ip.data_len]);
- SILC_PUT16_MSB(channel_id->rnd, &ret_id[channel_id->ip.data_len + 2]);
- return TRUE;
- break;
- }
-
- return FALSE;
-}
-
-/* Converts string to a ID */
-
-SilcBool silc_id_str2id(const unsigned char *id, SilcUInt32 id_len,
- SilcIdType type, void *ret_id, SilcUInt32 ret_id_size)
-{
- if (id_len > SILC_PACKET_MAX_ID_LEN)
- return FALSE;
-
- switch(type) {
- case SILC_ID_SERVER:
- {
- SilcServerID *server_id = ret_id;
-
- if (id_len != ID_SERVER_LEN_PART + 4 &&
- id_len != ID_SERVER_LEN_PART + 16)
- return FALSE;
-
- if (ret_id_size < sizeof(SilcServerID))
- return FALSE;
-
- memset(ret_id, 0, ret_id_size);
- memcpy(server_id->ip.data, id, (id_len > ID_SERVER_LEN_PART + 4 ?
- 16 : 4));
- server_id->ip.data_len = (id_len > ID_SERVER_LEN_PART + 4 ? 16 : 4);
- SILC_GET16_MSB(server_id->port, &id[server_id->ip.data_len]);
- SILC_GET16_MSB(server_id->rnd, &id[server_id->ip.data_len + 2]);
- return TRUE;
- }
- break;
- case SILC_ID_CLIENT:
- {
- SilcClientID *client_id = ret_id;
-
- if (id_len != ID_CLIENT_LEN_PART + 4 &&
- id_len != ID_CLIENT_LEN_PART + 16)
- return FALSE;
-
- if (ret_id_size < sizeof(SilcClientID))
- return FALSE;
-
- memset(ret_id, 0, ret_id_size);
- memcpy(client_id->ip.data, id, (id_len > ID_CLIENT_LEN_PART + 4 ?
- 16 : 4));
- client_id->ip.data_len = (id_len > ID_CLIENT_LEN_PART + 4 ? 16 : 4);
- client_id->rnd = id[client_id->ip.data_len];
- memcpy(client_id->hash, &id[client_id->ip.data_len + 1],
- CLIENTID_HASH_LEN);
- return TRUE;
- }
- break;
- case SILC_ID_CHANNEL:
- {
- SilcChannelID *channel_id = ret_id;
-
- if (id_len != ID_CHANNEL_LEN_PART + 4 &&
- id_len != ID_CHANNEL_LEN_PART + 16)
- return FALSE;
-
- if (ret_id_size < sizeof(SilcChannelID))
- return FALSE;
-
- memset(ret_id, 0, ret_id_size);
- memcpy(channel_id->ip.data, id, (id_len > ID_CHANNEL_LEN_PART + 4 ?
- 16 : 4));
- channel_id->ip.data_len = (id_len > ID_CHANNEL_LEN_PART + 4 ? 16 : 4);
- SILC_GET16_MSB(channel_id->port, &id[channel_id->ip.data_len]);
- SILC_GET16_MSB(channel_id->rnd, &id[channel_id->ip.data_len + 2]);
- return TRUE;
- }
- break;
- }
-
- return FALSE;
-}
-
-/* Converts string to ID */
-
-SilcBool silc_id_str2id2(const unsigned char *id, SilcUInt32 id_len,
- SilcIdType type, SilcID *ret_id)
-{
- if (!ret_id)
- return FALSE;
-
- ret_id->type = type;
-
- switch (type) {
- case SILC_ID_CLIENT:
- return silc_id_str2id(id, id_len, type, &ret_id->u.client_id,
- sizeof(ret_id->u.client_id));
- break;
-
- case SILC_ID_SERVER:
- return silc_id_str2id(id, id_len, type, &ret_id->u.server_id,
- sizeof(ret_id->u.server_id));
- break;
-
- case SILC_ID_CHANNEL:
- return silc_id_str2id(id, id_len, type, &ret_id->u.channel_id,
- sizeof(ret_id->u.channel_id));
- break;
- }
-
- return FALSE;
-}
-
-/* Returns length of the ID */
-
-SilcUInt32 silc_id_get_len(const void *id, SilcIdType type)
-{
- switch(type) {
- case SILC_ID_SERVER:
- {
- SilcServerID *server_id = (SilcServerID *)id;
- return ID_SERVER_LEN_PART + server_id->ip.data_len;
- }
- break;
- case SILC_ID_CLIENT:
- {
- SilcClientID *client_id = (SilcClientID *)id;
- return ID_CLIENT_LEN_PART + client_id->ip.data_len;
- }
- break;
- case SILC_ID_CHANNEL:
- {
- SilcChannelID *channel_id = (SilcChannelID *)id;
- return ID_CHANNEL_LEN_PART + channel_id->ip.data_len;
- }
- break;
- }
-
- return 0;
-}
-
-/* Duplicate ID data */
-
-void *silc_id_dup(const void *id, SilcIdType type)
-{
- switch(type) {
- case SILC_ID_SERVER:
- {
- SilcServerID *server_id = (SilcServerID *)id;
- return silc_memdup(server_id, sizeof(*server_id));
- }
- break;
- case SILC_ID_CLIENT:
- {
- SilcClientID *client_id = (SilcClientID *)id;
- return silc_memdup(client_id, sizeof(*client_id));
- }
- break;
- case SILC_ID_CHANNEL:
- {
- SilcChannelID *channel_id = (SilcChannelID *)id;
- return silc_memdup(channel_id, sizeof(*channel_id));
- }
- break;
- }
-
- return NULL;
-}
-
-/**************************** Utility functions *****************************/
-
-/* Hash a ID. The `user_context' is the ID type. */
-
-SilcUInt32 silc_hash_id(void *key, void *user_context)
-{
- SilcIdType id_type = (SilcIdType)SILC_PTR_TO_32(user_context);
- SilcUInt32 h = 0;
- int i;
-
- switch (id_type) {
- case SILC_ID_CLIENT:
- {
- SilcClientID *id = (SilcClientID *)key;
-
- /* The client ID is hashed by hashing the hash of the ID
- (which is a truncated MD5 hash of the nickname) so that we
- can access the entry from the cache with both Client ID but
- with just a hash from the ID as well. */
- return silc_hash_client_id_hash(id->hash, NULL);
- }
- break;
- case SILC_ID_SERVER:
- {
- SilcServerID *id = (SilcServerID *)key;
-
- h = id->port * id->rnd;
- for (i = 0; i < id->ip.data_len; i++)
- h ^= id->ip.data[i];
-
- return h;
- }
- break;
- case SILC_ID_CHANNEL:
- {
- SilcChannelID *id = (SilcChannelID *)key;
-
- h = id->port * id->rnd;
- for (i = 0; i < id->ip.data_len; i++)
- h ^= id->ip.data[i];
-
- return h;
- }
- break;
- default:
- break;
- }
-
- return h;
-}
-
-/* Hash Client ID's hash. */
-
-SilcUInt32 silc_hash_client_id_hash(void *key, void *user_context)
-{
- int i;
- unsigned char *hash = key;
- SilcUInt32 h = 0, g;
-
- for (i = 0; i < CLIENTID_HASH_LEN; i++) {
- h = (h << 4) + hash[i];
- if ((g = h & 0xf0000000)) {
- h = h ^ (g >> 24);
- h = h ^ g;
- }
- }
-
- return h;
-}
-
-/* Compares two ID's. May be used as SilcHashTable comparison function.
- The Client ID's compares only the hash of the Client ID not any other
- part of the Client ID. Other ID's are fully compared. */
-
-SilcBool silc_hash_id_compare(void *key1, void *key2, void *user_context)
-{
- SilcIdType id_type = (SilcIdType)SILC_PTR_TO_32(user_context);
- return (id_type == SILC_ID_CLIENT ?
- SILC_ID_COMPARE_HASH((SilcClientID *)key1, (SilcClientID *)key2) :
- SILC_ID_COMPARE_TYPE(key1, key2, id_type));
-}
-
-/* Compares two ID's. Compares full IDs. */
-
-SilcBool silc_hash_id_compare_full(void *key1, void *key2, void *user_context)
-{
- SilcIdType id_type = (SilcIdType)SILC_PTR_TO_32(user_context);
- return SILC_ID_COMPARE_TYPE(key1, key2, id_type);
-}
-
-/* Compare two Client ID's entirely and not just the hash from the ID. */
-
-SilcBool silc_hash_client_id_compare(void *key1, void *key2,
- void *user_context)
-{
- return SILC_ID_COMPARE_TYPE(key1, key2, SILC_ID_CLIENT);
-}
projects / crypto.git / blobdiff