+++ /dev/null
-/*
- * WPA Supplicant - Layer2 packet handling with privilege separation
- * Copyright (c) 2007, Jouni Malinen <j@w1.fi>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Alternatively, this software may be distributed under the terms of BSD
- * license.
- *
- * See README and COPYING for more details.
- */
-
-#include "includes.h"
-#include <sys/un.h>
-
-#include "common.h"
-#include "eloop.h"
-#include "l2_packet.h"
-#include "common/privsep_commands.h"
-
-
-struct l2_packet_data {
- int fd; /* UNIX domain socket for privsep access */
- void (*rx_callback)(void *ctx, const u8 *src_addr,
- const u8 *buf, size_t len);
- void *rx_callback_ctx;
- u8 own_addr[ETH_ALEN];
- char *own_socket_path;
- struct sockaddr_un priv_addr;
-};
-
-
-static int wpa_priv_cmd(struct l2_packet_data *l2, int cmd,
- const void *data, size_t data_len)
-{
- struct msghdr msg;
- struct iovec io[2];
-
- io[0].iov_base = &cmd;
- io[0].iov_len = sizeof(cmd);
- io[1].iov_base = (u8 *) data;
- io[1].iov_len = data_len;
-
- os_memset(&msg, 0, sizeof(msg));
- msg.msg_iov = io;
- msg.msg_iovlen = data ? 2 : 1;
- msg.msg_name = &l2->priv_addr;
- msg.msg_namelen = sizeof(l2->priv_addr);
-
- if (sendmsg(l2->fd, &msg, 0) < 0) {
- perror("L2: sendmsg(cmd)");
- return -1;
- }
-
- return 0;
-}
-
-
-int l2_packet_get_own_addr(struct l2_packet_data *l2, u8 *addr)
-{
- os_memcpy(addr, l2->own_addr, ETH_ALEN);
- return 0;
-}
-
-
-int l2_packet_send(struct l2_packet_data *l2, const u8 *dst_addr, u16 proto,
- const u8 *buf, size_t len)
-{
- struct msghdr msg;
- struct iovec io[4];
- int cmd = PRIVSEP_CMD_L2_SEND;
-
- io[0].iov_base = &cmd;
- io[0].iov_len = sizeof(cmd);
- io[1].iov_base = &dst_addr;
- io[1].iov_len = ETH_ALEN;
- io[2].iov_base = &proto;
- io[2].iov_len = 2;
- io[3].iov_base = (u8 *) buf;
- io[3].iov_len = len;
-
- os_memset(&msg, 0, sizeof(msg));
- msg.msg_iov = io;
- msg.msg_iovlen = 4;
- msg.msg_name = &l2->priv_addr;
- msg.msg_namelen = sizeof(l2->priv_addr);
-
- if (sendmsg(l2->fd, &msg, 0) < 0) {
- perror("L2: sendmsg(packet_send)");
- return -1;
- }
-
- return 0;
-}
-
-
-static void l2_packet_receive(int sock, void *eloop_ctx, void *sock_ctx)
-{
- struct l2_packet_data *l2 = eloop_ctx;
- u8 buf[2300];
- int res;
- struct sockaddr_un from;
- socklen_t fromlen = sizeof(from);
-
- os_memset(&from, 0, sizeof(from));
- res = recvfrom(sock, buf, sizeof(buf), 0, (struct sockaddr *) &from,
- &fromlen);
- if (res < 0) {
- perror("l2_packet_receive - recvfrom");
- return;
- }
- if (res < ETH_ALEN) {
- wpa_printf(MSG_DEBUG, "L2: Too show packet received");
- return;
- }
-
- if (from.sun_family != AF_UNIX ||
- os_strncmp(from.sun_path, l2->priv_addr.sun_path,
- sizeof(from.sun_path)) != 0) {
- wpa_printf(MSG_DEBUG, "L2: Received message from unexpected "
- "source");
- return;
- }
-
- l2->rx_callback(l2->rx_callback_ctx, buf, buf + ETH_ALEN,
- res - ETH_ALEN);
-}
-
-
-struct l2_packet_data * l2_packet_init(
- const char *ifname, const u8 *own_addr, unsigned short protocol,
- void (*rx_callback)(void *ctx, const u8 *src_addr,
- const u8 *buf, size_t len),
- void *rx_callback_ctx, int l2_hdr)
-{
- struct l2_packet_data *l2;
- char *own_dir = "/tmp";
- char *priv_dir = "/var/run/wpa_priv";
- size_t len;
- static unsigned int counter = 0;
- struct sockaddr_un addr;
- fd_set rfds;
- struct timeval tv;
- int res;
- u8 reply[ETH_ALEN + 1];
- int reg_cmd[2];
-
- l2 = os_zalloc(sizeof(struct l2_packet_data));
- if (l2 == NULL)
- return NULL;
- l2->rx_callback = rx_callback;
- l2->rx_callback_ctx = rx_callback_ctx;
-
- len = os_strlen(own_dir) + 50;
- l2->own_socket_path = os_malloc(len);
- if (l2->own_socket_path == NULL) {
- os_free(l2);
- return NULL;
- }
- os_snprintf(l2->own_socket_path, len, "%s/wpa_privsep-l2-%d-%d",
- own_dir, getpid(), counter++);
-
- l2->priv_addr.sun_family = AF_UNIX;
- os_snprintf(l2->priv_addr.sun_path, sizeof(l2->priv_addr.sun_path),
- "%s/%s", priv_dir, ifname);
-
- l2->fd = socket(PF_UNIX, SOCK_DGRAM, 0);
- if (l2->fd < 0) {
- perror("socket(PF_UNIX)");
- os_free(l2->own_socket_path);
- l2->own_socket_path = NULL;
- os_free(l2);
- return NULL;
- }
-
- os_memset(&addr, 0, sizeof(addr));
- addr.sun_family = AF_UNIX;
- os_strlcpy(addr.sun_path, l2->own_socket_path, sizeof(addr.sun_path));
- if (bind(l2->fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
- perror("bind(PF_UNIX)");
- goto fail;
- }
-
- reg_cmd[0] = protocol;
- reg_cmd[1] = l2_hdr;
- if (wpa_priv_cmd(l2, PRIVSEP_CMD_L2_REGISTER, reg_cmd, sizeof(reg_cmd))
- < 0) {
- wpa_printf(MSG_ERROR, "L2: Failed to register with wpa_priv");
- goto fail;
- }
-
- FD_ZERO(&rfds);
- FD_SET(l2->fd, &rfds);
- tv.tv_sec = 5;
- tv.tv_usec = 0;
- res = select(l2->fd + 1, &rfds, NULL, NULL, &tv);
- if (res < 0 && errno != EINTR) {
- perror("select");
- goto fail;
- }
-
- if (FD_ISSET(l2->fd, &rfds)) {
- res = recv(l2->fd, reply, sizeof(reply), 0);
- if (res < 0) {
- perror("recv");
- goto fail;
- }
- } else {
- wpa_printf(MSG_DEBUG, "L2: Timeout while waiting for "
- "registration reply");
- goto fail;
- }
-
- if (res != ETH_ALEN) {
- wpa_printf(MSG_DEBUG, "L2: Unexpected registration reply "
- "(len=%d)", res);
- }
- os_memcpy(l2->own_addr, reply, ETH_ALEN);
-
- eloop_register_read_sock(l2->fd, l2_packet_receive, l2, NULL);
-
- return l2;
-
-fail:
- close(l2->fd);
- l2->fd = -1;
- unlink(l2->own_socket_path);
- os_free(l2->own_socket_path);
- l2->own_socket_path = NULL;
- os_free(l2);
- return NULL;
-}
-
-
-void l2_packet_deinit(struct l2_packet_data *l2)
-{
- if (l2 == NULL)
- return;
-
- if (l2->fd >= 0) {
- wpa_priv_cmd(l2, PRIVSEP_CMD_L2_UNREGISTER, NULL, 0);
- eloop_unregister_read_sock(l2->fd);
- close(l2->fd);
- }
-
- if (l2->own_socket_path) {
- unlink(l2->own_socket_path);
- os_free(l2->own_socket_path);
- }
-
- os_free(l2);
-}
-
-
-int l2_packet_get_ip_addr(struct l2_packet_data *l2, char *buf, size_t len)
-{
- /* TODO */
- return -1;
-}
-
-
-void l2_packet_notify_auth_start(struct l2_packet_data *l2)
-{
- wpa_priv_cmd(l2, PRIVSEP_CMD_L2_NOTIFY_AUTH_START, NULL, 0);
-}
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