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-rw-r--r--Source/charon/network/socket.c457
1 files changed, 0 insertions, 457 deletions
diff --git a/Source/charon/network/socket.c b/Source/charon/network/socket.c
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--- a/Source/charon/network/socket.c
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@@ -1,457 +0,0 @@
-/**
- * @file socket.c
- *
- * @brief Implementation of socket_t.
- *
- */
-
-/*
- * Copyright (C) 2005 Jan Hutter, Martin Willi
- * Hochschule fuer Technik Rapperswil
- * Copyright (C) 1998-2002 D. Hugh Redelmeier.
- * Copyright (C) 1997 Angelos D. Keromytis.
- *
- * Some parts of interface lookup code from pluto.
- *
- * 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; either version 2 of the License, or (at your
- * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
- *
- * 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.
- */
-
-#include <pthread.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <string.h>
-#include <errno.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <fcntl.h>
-#include <net/if.h>
-#include <sys/ioctl.h>
-#include <netinet/in.h>
-#include <linux/filter.h>
-
-#include "socket.h"
-
-#include <daemon.h>
-#include <utils/logger_manager.h>
-
-
-#define IP_HEADER_LENGTH 20
-#define UDP_HEADER_LENGTH 8
-
-
-/**
- * This filter code filters out all non-IKEv2 traffic on
- * a SOCK_RAW IP_PROTP_UDP socket. Handling of other
- * IKE versions is done in pluto.
- */
-struct sock_filter ikev2_filter_code[] =
-{
- /* Protocol must be UDP */
- BPF_STMT(BPF_LD+BPF_B+BPF_ABS, 9),
- BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, IPPROTO_UDP, 0, 7),
- /* Destination Port must be 500 */
- BPF_STMT(BPF_LD+BPF_H+BPF_ABS, 22),
- BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 500, 0, 5),
- /* IKE version must be 2.0 */
- BPF_STMT(BPF_LD+BPF_B+BPF_ABS, 45),
- BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, 0x20, 0, 3),
- /* packet length is length in IKEv2 header + ip header + udp header */
- BPF_STMT(BPF_LD+BPF_W+BPF_ABS, 52),
- BPF_STMT(BPF_ALU+BPF_ADD+BPF_K, IP_HEADER_LENGTH + UDP_HEADER_LENGTH),
- BPF_STMT(BPF_RET+BPF_A, 0),
- /* packet doesn't match IKEv2, ignore */
- BPF_STMT(BPF_RET+BPF_K, 0),
-};
-
-/**
- * Filter struct to use with setsockopt
- */
-struct sock_fprog ikev2_filter = {
- sizeof(ikev2_filter_code) / sizeof(struct sock_filter),
- ikev2_filter_code
-};
-
-
-typedef struct interface_t interface_t;
-
-/**
- * An interface on which we listen.
- */
-struct interface_t {
-
- /**
- * Name of the interface
- */
- char name[IFNAMSIZ];
-
- /**
- * Associated socket
- */
- int socket_fd;
-
- /**
- * Host with listening address
- */
- host_t *address;
-};
-
-typedef struct private_socket_t private_socket_t;
-
-/**
- * Private data of an socket_t object
- */
-struct private_socket_t{
- /**
- * public functions
- */
- socket_t public;
-
- /**
- * Master socket
- */
- int master_fd;
-
- /**
- * List of all socket to listen
- */
- linked_list_t* interfaces;
-
- /**
- * logger for this socket
- */
- logger_t *logger;
-};
-
-/**
- * implementation of socket_t.receive
- */
-static status_t receiver(private_socket_t *this, packet_t **packet)
-{
- char buffer[MAX_PACKET];
- chunk_t data;
- packet_t *pkt = packet_create();
- host_t *source, *dest;
- int bytes_read = 0;
-
-
- while (bytes_read >= 0)
- {
- int max_fd = 1;
- fd_set readfds;
- iterator_t *iterator;
- int oldstate;
- interface_t *interface;
-
- /* build fd_set */
- FD_ZERO(&readfds);
- iterator = this->interfaces->create_iterator(this->interfaces, TRUE);
- while (iterator->has_next(iterator))
- {
- iterator->current(iterator, (void**)&interface);
- FD_SET(interface->socket_fd, &readfds);
- if (interface->socket_fd > max_fd)
- {
- max_fd = interface->socket_fd + 1;
- }
- }
- iterator->destroy(iterator);
-
- /* add packet destroy handler for cancellation, enable cancellation */
- pthread_cleanup_push((void(*)(void*))pkt->destroy, (void*)pkt);
- pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldstate);
-
- this->logger->log(this->logger, CONTROL|LEVEL1, "waiting on sockets");
- bytes_read = select(max_fd, &readfds, NULL, NULL, NULL);
-
- /* reset cancellation, remove packet destroy handler (without executing) */
- pthread_setcancelstate(oldstate, NULL);
- pthread_cleanup_pop(0);
-
- /* read on the first nonblocking socket */
- bytes_read = 0;
- iterator = this->interfaces->create_iterator(this->interfaces, TRUE);
- while (iterator->has_next(iterator))
- {
- iterator->current(iterator, (void**)&interface);
- if (FD_ISSET(interface->socket_fd, &readfds))
- {
- /* do the read */
- bytes_read = recv(interface->socket_fd, buffer, MAX_PACKET, 0);
- break;
- }
- }
- iterator->destroy(iterator);
-
- if (bytes_read < 0)
- {
- this->logger->log(this->logger, ERROR, "error reading from socket: %s", strerror(errno));
- continue;
- }
- if (bytes_read > IP_HEADER_LENGTH + UDP_HEADER_LENGTH)
- {
- /* read source/dest from raw IP/UDP header */
- chunk_t source_chunk = {buffer + 12, 4};
- chunk_t dest_chunk = {buffer + 16, 4};
- u_int16_t source_port = ntohs(*(u_int16_t*)(buffer + 20));
- u_int16_t dest_port = ntohs(*(u_int16_t*)(buffer + 22));
- source = host_create_from_chunk(AF_INET, source_chunk, source_port);
- dest = host_create_from_chunk(AF_INET, dest_chunk, dest_port);
- pkt->set_source(pkt, source);
- pkt->set_destination(pkt, dest);
- break;
- }
- this->logger->log(this->logger, ERROR|LEVEL1, "too short packet received");
- }
-
- this->logger->log(this->logger, CONTROL, "received packet: from %s:%d to %s:%d",
- source->get_address(source), source->get_port(source),
- dest->get_address(dest), dest->get_port(dest));
-
- /* fill in packet */
- data.len = bytes_read - IP_HEADER_LENGTH - UDP_HEADER_LENGTH;
- data.ptr = malloc(data.len);
- memcpy(data.ptr, buffer + IP_HEADER_LENGTH + UDP_HEADER_LENGTH, data.len);
- pkt->set_data(pkt, data);
-
- /* return packet */
- *packet = pkt;
-
- return SUCCESS;
-}
-
-/**
- * implementation of socket_t.send
- */
-status_t sender(private_socket_t *this, packet_t *packet)
-{
- ssize_t bytes_sent;
- chunk_t data;
- host_t *src, *dst;
-
- src = packet->get_source(packet);
- dst = packet->get_destination(packet);
- data = packet->get_data(packet);
-
- this->logger->log(this->logger, CONTROL, "sending packet: from %s:%d to %s:%d",
- src->get_address(src), src->get_port(src),
- dst->get_address(dst), dst->get_port(dst));
-
- /* send data */
- /* TODO: should we send via the interface we received the packet? */
- bytes_sent = sendto(this->master_fd, data.ptr, data.len, 0,
- dst->get_sockaddr(dst), *(dst->get_sockaddr_len(dst)));
-
- if (bytes_sent != data.len)
- {
- this->logger->log(this->logger, ERROR, "error writing to socket: %s", strerror(errno));
- return FAILED;
- }
- return SUCCESS;
-}
-
-/**
- * Find all suitable interfaces, bind them and add them to the list
- */
-static status_t build_interface_list(private_socket_t *this, u_int16_t port)
-{
- int on = TRUE;
- int i;
- struct sockaddr_in addr;
- struct ifconf ifconf;
- struct ifreq buf[300];
-
- /* master socket for querying socket for a specific interfaces */
- this->master_fd = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
- if (this->master_fd == -1)
- {
- this->logger->log(this->logger, ERROR, "could not open IPv4 master socket!");
- return FAILED;
- }
-
- /* allow binding of multiplo sockets */
- if (setsockopt(this->master_fd, SOL_SOCKET, SO_REUSEADDR, (void*)&on, sizeof(on)) < 0)
- {
- this->logger->log(this->logger, ERROR, "unable to set SO_REUSEADDR on master socket!");
- return FAILED;
- }
-
- /* bind the master socket */
- addr.sin_family = AF_INET;
- addr.sin_addr.s_addr = INADDR_ANY;
- addr.sin_port = htons(port);
- if (bind(this->master_fd,(struct sockaddr*)&addr, sizeof(addr)) < 0)
- {
- this->logger->log(this->logger, ERROR, "unable to bind master socket: %s!", strerror(errno));
- return FAILED;
- }
-
- /* get all interfaces */
- ifconf.ifc_len = sizeof(buf);
- ifconf.ifc_buf = (void*) buf;
- memset(buf, 0, sizeof(buf));
- if (ioctl(this->master_fd, SIOCGIFCONF, &ifconf) == -1)
- {
- this->logger->log(this->logger, ERROR, "unable to get interfaces!");
- return FAILED;
- }
-
- /* add every interesting interfaces to our interface list */
- for (i = 0; (i+1) * sizeof(*buf) <= (size_t)ifconf.ifc_len; i++)
- {
- struct sockaddr_in *current = (struct sockaddr_in*) &buf[i].ifr_addr;
- struct ifreq auxinfo;
- int skt;
- interface_t *interface;
-
- if (current->sin_family != AF_INET)
- {
- /* ignore all but AF_INET interfaces */
- continue;
- }
-
- /* get auxilary info about socket */
- memset(&auxinfo, 0, sizeof(auxinfo));
- memcpy(auxinfo.ifr_name, buf[i].ifr_name, IFNAMSIZ);
- if (ioctl(this->master_fd, SIOCGIFFLAGS, &auxinfo) == -1)
- {
- this->logger->log(this->logger, ERROR, "unable to SIOCGIFFLAGS master socket!");
- continue;
- }
- if (!(auxinfo.ifr_flags & IFF_UP))
- {
- /* ignore an interface that isn't up */
- continue;
- }
- if (current->sin_addr.s_addr == 0)
- {
- /* ignore unconfigured interfaces */
- continue;
- }
-
- /* set up interface socket */
- skt = socket(AF_INET, SOCK_RAW, IPPROTO_UDP);
- if (socket < 0)
- {
- this->logger->log(this->logger, ERROR, "unable to open interface socket!");
- continue;
- }
- if (setsockopt(skt, SOL_SOCKET, SO_REUSEADDR, (void*)&on, sizeof(on)) < 0)
- {
- this->logger->log(this->logger, ERROR, "unable to set SO_REUSEADDR on interface socket!");
- close(skt);
- continue;
- }
- current->sin_port = htons(port);
- current->sin_family = AF_INET;
- if (bind(skt, (struct sockaddr*)current, sizeof(struct sockaddr_in)) < 0)
- {
- this->logger->log(this->logger, ERROR, "unable to bind interface socket!");
- close(skt);
- continue;
- }
-
- if (setsockopt(skt, SOL_SOCKET, SO_ATTACH_FILTER, &ikev2_filter, sizeof(ikev2_filter)) < 0)
- {
- this->logger->log(this->logger, ERROR, "unable to attack IKEv2 filter to interface socket!");
- close(skt);
- continue;
- }
-
- /* add socket with interface name to list */
- interface = malloc_thing(interface_t);
- memcpy(interface->name, buf[i].ifr_name, IFNAMSIZ);
- interface->name[IFNAMSIZ-1] = '\0';
- interface->socket_fd = skt;
- interface->address = host_create_from_sockaddr((struct sockaddr*)current);
- this->logger->log(this->logger, CONTROL, "listening on %s (%s)",
- interface->name, interface->address->get_address(interface->address));
- this->interfaces->insert_last(this->interfaces, (void*)interface);
- }
-
- if (this->interfaces->get_count(this->interfaces) == 0)
- {
- this->logger->log(this->logger, ERROR, "unable to find any usable interface!");
- return FAILED;
- }
- return SUCCESS;
-}
-
-/**
- * implementation of socket_t.is_listening_on
- */
-static bool is_listening_on(private_socket_t *this, host_t *host)
-{
- iterator_t *iterator;
-
- /* listening on 0.0.0.0 is always TRUE */
- if (host->is_default_route(host))
- {
- return TRUE;
- }
-
- /* compare host with all interfaces */
- iterator = this->interfaces->create_iterator(this->interfaces, TRUE);
- while (iterator->has_next(iterator))
- {
- interface_t *interface;
- iterator->current(iterator, (void**)&interface);
- if (host->equals(host, interface->address))
- {
- iterator->destroy(iterator);
- return TRUE;
- }
- }
- iterator->destroy(iterator);
- return FALSE;
-}
-
-/**
- * implementation of socket_t.destroy
- */
-static void destroy(private_socket_t *this)
-{
- interface_t *interface;
- while (this->interfaces->remove_last(this->interfaces, (void**)&interface) == SUCCESS)
- {
- interface->address->destroy(interface->address);
- close(interface->socket_fd);
- free(interface);
- }
- this->interfaces->destroy(this->interfaces);
- close(this->master_fd);
- free(this);
-}
-
-/*
- * See header for description
- */
-socket_t *socket_create(u_int16_t port)
-{
- private_socket_t *this = malloc_thing(private_socket_t);
-
- /* public functions */
- this->public.send = (status_t(*)(socket_t*, packet_t*))sender;
- this->public.receive = (status_t(*)(socket_t*, packet_t**))receiver;
- this->public.is_listening_on = (bool (*)(socket_t*,host_t*))is_listening_on;
- this->public.destroy = (void(*)(socket_t*)) destroy;
-
- this->logger = logger_manager->get_logger(logger_manager, SOCKET);
- this->interfaces = linked_list_create();
-
- if (build_interface_list(this, port) != SUCCESS)
- {
- this->interfaces->destroy(this->interfaces);
- free(this);
- charon->kill(charon, "could not bind any interface!");
- }
-
- return (socket_t*)this;
-}
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