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authorJouni Malinen <j@w1.fi>2008-02-28 01:34:43 (GMT)
committerJouni Malinen <jm@jm.kir.nu>2008-02-28 01:34:43 (GMT)
commit6fc6879bd55a394f807cbbe927df736c190cb8ab (patch)
treecdf50da0c58f21510a808d53502a060d911ff243 /wpa_supplicant/ctrl_iface_udp.c
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Re-initialize hostapd/wpa_supplicant git repository based on 0.6.3 release
Diffstat (limited to 'wpa_supplicant/ctrl_iface_udp.c')
-rw-r--r--wpa_supplicant/ctrl_iface_udp.c561
1 files changed, 561 insertions, 0 deletions
diff --git a/wpa_supplicant/ctrl_iface_udp.c b/wpa_supplicant/ctrl_iface_udp.c
new file mode 100644
index 0000000..18e4040
--- /dev/null
+++ b/wpa_supplicant/ctrl_iface_udp.c
@@ -0,0 +1,561 @@
+/*
+ * WPA Supplicant / UDP socket -based control interface
+ * Copyright (c) 2004-2005, 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 "common.h"
+#include "eloop.h"
+#include "config.h"
+#include "eapol_supp/eapol_supp_sm.h"
+#include "wpa_supplicant_i.h"
+#include "ctrl_iface.h"
+#include "wpa_ctrl.h"
+
+
+#define COOKIE_LEN 8
+
+/* Per-interface ctrl_iface */
+
+/**
+ * struct wpa_ctrl_dst - Internal data structure of control interface monitors
+ *
+ * This structure is used to store information about registered control
+ * interface monitors into struct wpa_supplicant. This data is private to
+ * ctrl_iface_udp.c and should not be touched directly from other files.
+ */
+struct wpa_ctrl_dst {
+ struct wpa_ctrl_dst *next;
+ struct sockaddr_in addr;
+ socklen_t addrlen;
+ int debug_level;
+ int errors;
+};
+
+
+struct ctrl_iface_priv {
+ struct wpa_supplicant *wpa_s;
+ int sock;
+ struct wpa_ctrl_dst *ctrl_dst;
+ u8 cookie[COOKIE_LEN];
+};
+
+
+static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
+ int level, const char *buf,
+ size_t len);
+
+
+static int wpa_supplicant_ctrl_iface_attach(struct ctrl_iface_priv *priv,
+ struct sockaddr_in *from,
+ socklen_t fromlen)
+{
+ struct wpa_ctrl_dst *dst;
+
+ dst = os_zalloc(sizeof(*dst));
+ if (dst == NULL)
+ return -1;
+ os_memcpy(&dst->addr, from, sizeof(struct sockaddr_in));
+ dst->addrlen = fromlen;
+ dst->debug_level = MSG_INFO;
+ dst->next = priv->ctrl_dst;
+ priv->ctrl_dst = dst;
+ wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor attached %s:%d",
+ inet_ntoa(from->sin_addr), ntohs(from->sin_port));
+ return 0;
+}
+
+
+static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
+ struct sockaddr_in *from,
+ socklen_t fromlen)
+{
+ struct wpa_ctrl_dst *dst, *prev = NULL;
+
+ dst = priv->ctrl_dst;
+ while (dst) {
+ if (from->sin_addr.s_addr == dst->addr.sin_addr.s_addr &&
+ from->sin_port == dst->addr.sin_port) {
+ if (prev == NULL)
+ priv->ctrl_dst = dst->next;
+ else
+ prev->next = dst->next;
+ os_free(dst);
+ wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor detached "
+ "%s:%d", inet_ntoa(from->sin_addr),
+ ntohs(from->sin_port));
+ return 0;
+ }
+ prev = dst;
+ dst = dst->next;
+ }
+ return -1;
+}
+
+
+static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
+ struct sockaddr_in *from,
+ socklen_t fromlen,
+ char *level)
+{
+ struct wpa_ctrl_dst *dst;
+
+ wpa_printf(MSG_DEBUG, "CTRL_IFACE LEVEL %s", level);
+
+ dst = priv->ctrl_dst;
+ while (dst) {
+ if (from->sin_addr.s_addr == dst->addr.sin_addr.s_addr &&
+ from->sin_port == dst->addr.sin_port) {
+ wpa_printf(MSG_DEBUG, "CTRL_IFACE changed monitor "
+ "level %s:%d", inet_ntoa(from->sin_addr),
+ ntohs(from->sin_port));
+ dst->debug_level = atoi(level);
+ return 0;
+ }
+ dst = dst->next;
+ }
+
+ return -1;
+}
+
+
+static char *
+wpa_supplicant_ctrl_iface_get_cookie(struct ctrl_iface_priv *priv,
+ size_t *reply_len)
+{
+ char *reply;
+ reply = os_malloc(7 + 2 * COOKIE_LEN + 1);
+ if (reply == NULL) {
+ *reply_len = 1;
+ return NULL;
+ }
+
+ os_memcpy(reply, "COOKIE=", 7);
+ wpa_snprintf_hex(reply + 7, 2 * COOKIE_LEN + 1,
+ priv->cookie, COOKIE_LEN);
+
+ *reply_len = 7 + 2 * COOKIE_LEN;
+ return reply;
+}
+
+
+static void wpa_supplicant_ctrl_iface_receive(int sock, void *eloop_ctx,
+ void *sock_ctx)
+{
+ struct wpa_supplicant *wpa_s = eloop_ctx;
+ struct ctrl_iface_priv *priv = sock_ctx;
+ char buf[256], *pos;
+ int res;
+ struct sockaddr_in from;
+ socklen_t fromlen = sizeof(from);
+ char *reply = NULL;
+ size_t reply_len = 0;
+ int new_attached = 0;
+ u8 cookie[COOKIE_LEN];
+
+ res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
+ (struct sockaddr *) &from, &fromlen);
+ if (res < 0) {
+ perror("recvfrom(ctrl_iface)");
+ return;
+ }
+ if (from.sin_addr.s_addr != htonl((127 << 24) | 1)) {
+ /*
+ * The OS networking stack is expected to drop this kind of
+ * frames since the socket is bound to only localhost address.
+ * Just in case, drop the frame if it is coming from any other
+ * address.
+ */
+ wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected "
+ "source %s", inet_ntoa(from.sin_addr));
+ return;
+ }
+ buf[res] = '\0';
+
+ if (os_strcmp(buf, "GET_COOKIE") == 0) {
+ reply = wpa_supplicant_ctrl_iface_get_cookie(priv, &reply_len);
+ goto done;
+ }
+
+ /*
+ * Require that the client includes a prefix with the 'cookie' value
+ * fetched with GET_COOKIE command. This is used to verify that the
+ * client has access to a bidirectional link over UDP in order to
+ * avoid attacks using forged localhost IP address even if the OS does
+ * not block such frames from remote destinations.
+ */
+ if (os_strncmp(buf, "COOKIE=", 7) != 0) {
+ wpa_printf(MSG_DEBUG, "CTLR: No cookie in the request - "
+ "drop request");
+ return;
+ }
+
+ if (hexstr2bin(buf + 7, cookie, COOKIE_LEN) < 0) {
+ wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie format in the "
+ "request - drop request");
+ return;
+ }
+
+ if (os_memcmp(cookie, priv->cookie, COOKIE_LEN) != 0) {
+ wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie in the request - "
+ "drop request");
+ return;
+ }
+
+ pos = buf + 7 + 2 * COOKIE_LEN;
+ while (*pos == ' ')
+ pos++;
+
+ if (os_strcmp(pos, "ATTACH") == 0) {
+ if (wpa_supplicant_ctrl_iface_attach(priv, &from, fromlen))
+ reply_len = 1;
+ else {
+ new_attached = 1;
+ reply_len = 2;
+ }
+ } else if (os_strcmp(pos, "DETACH") == 0) {
+ if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
+ reply_len = 1;
+ else
+ reply_len = 2;
+ } else if (os_strncmp(pos, "LEVEL ", 6) == 0) {
+ if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
+ pos + 6))
+ reply_len = 1;
+ else
+ reply_len = 2;
+ } else {
+ reply = wpa_supplicant_ctrl_iface_process(wpa_s, pos,
+ &reply_len);
+ }
+
+ done:
+ if (reply) {
+ sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
+ fromlen);
+ os_free(reply);
+ } else if (reply_len == 1) {
+ sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
+ fromlen);
+ } else if (reply_len == 2) {
+ sendto(sock, "OK\n", 3, 0, (struct sockaddr *) &from,
+ fromlen);
+ }
+
+ if (new_attached)
+ eapol_sm_notify_ctrl_attached(wpa_s->eapol);
+}
+
+
+static void wpa_supplicant_ctrl_iface_msg_cb(void *ctx, int level,
+ const char *txt, size_t len)
+{
+ struct wpa_supplicant *wpa_s = ctx;
+ if (wpa_s == NULL || wpa_s->ctrl_iface == NULL)
+ return;
+ wpa_supplicant_ctrl_iface_send(wpa_s->ctrl_iface, level, txt, len);
+}
+
+
+struct ctrl_iface_priv *
+wpa_supplicant_ctrl_iface_init(struct wpa_supplicant *wpa_s)
+{
+ struct ctrl_iface_priv *priv;
+ struct sockaddr_in addr;
+
+ priv = os_zalloc(sizeof(*priv));
+ if (priv == NULL)
+ return NULL;
+ priv->wpa_s = wpa_s;
+ priv->sock = -1;
+ os_get_random(priv->cookie, COOKIE_LEN);
+
+ if (wpa_s->conf->ctrl_interface == NULL)
+ return priv;
+
+ priv->sock = socket(PF_INET, SOCK_DGRAM, 0);
+ if (priv->sock < 0) {
+ perror("socket(PF_INET)");
+ goto fail;
+ }
+
+ os_memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_addr.s_addr = htonl((127 << 24) | 1);
+ addr.sin_port = htons(WPA_CTRL_IFACE_PORT);
+ if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+ perror("bind(AF_INET)");
+ goto fail;
+ }
+
+ eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
+ wpa_s, priv);
+ wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
+
+ return priv;
+
+fail:
+ if (priv->sock >= 0)
+ close(priv->sock);
+ os_free(priv);
+ return NULL;
+}
+
+
+void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
+{
+ struct wpa_ctrl_dst *dst, *prev;
+
+ if (priv->sock > -1) {
+ eloop_unregister_read_sock(priv->sock);
+ if (priv->ctrl_dst) {
+ /*
+ * Wait a second before closing the control socket if
+ * there are any attached monitors in order to allow
+ * them to receive any pending messages.
+ */
+ wpa_printf(MSG_DEBUG, "CTRL_IFACE wait for attached "
+ "monitors to receive messages");
+ os_sleep(1, 0);
+ }
+ close(priv->sock);
+ priv->sock = -1;
+ }
+
+ dst = priv->ctrl_dst;
+ while (dst) {
+ prev = dst;
+ dst = dst->next;
+ os_free(prev);
+ }
+ os_free(priv);
+}
+
+
+static void wpa_supplicant_ctrl_iface_send(struct ctrl_iface_priv *priv,
+ int level, const char *buf,
+ size_t len)
+{
+ struct wpa_ctrl_dst *dst, *next;
+ char levelstr[10];
+ int idx;
+ char *sbuf;
+ int llen;
+
+ dst = priv->ctrl_dst;
+ if (priv->sock < 0 || dst == NULL)
+ return;
+
+ os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
+
+ llen = os_strlen(levelstr);
+ sbuf = os_malloc(llen + len);
+ if (sbuf == NULL)
+ return;
+
+ os_memcpy(sbuf, levelstr, llen);
+ os_memcpy(sbuf + llen, buf, len);
+
+ idx = 0;
+ while (dst) {
+ next = dst->next;
+ if (level >= dst->debug_level) {
+ wpa_printf(MSG_DEBUG, "CTRL_IFACE monitor send %s:%d",
+ inet_ntoa(dst->addr.sin_addr),
+ ntohs(dst->addr.sin_port));
+ if (sendto(priv->sock, sbuf, llen + len, 0,
+ (struct sockaddr *) &dst->addr,
+ sizeof(dst->addr)) < 0) {
+ perror("sendto(CTRL_IFACE monitor)");
+ dst->errors++;
+ if (dst->errors > 10) {
+ wpa_supplicant_ctrl_iface_detach(
+ priv, &dst->addr,
+ dst->addrlen);
+ }
+ } else
+ dst->errors = 0;
+ }
+ idx++;
+ dst = next;
+ }
+ os_free(sbuf);
+}
+
+
+void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
+{
+ wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor",
+ priv->wpa_s->ifname);
+ eloop_wait_for_read_sock(priv->sock);
+}
+
+
+/* Global ctrl_iface */
+
+struct ctrl_iface_global_priv {
+ int sock;
+ u8 cookie[COOKIE_LEN];
+};
+
+
+static char *
+wpa_supplicant_global_get_cookie(struct ctrl_iface_global_priv *priv,
+ size_t *reply_len)
+{
+ char *reply;
+ reply = os_malloc(7 + 2 * COOKIE_LEN + 1);
+ if (reply == NULL) {
+ *reply_len = 1;
+ return NULL;
+ }
+
+ os_memcpy(reply, "COOKIE=", 7);
+ wpa_snprintf_hex(reply + 7, 2 * COOKIE_LEN + 1,
+ priv->cookie, COOKIE_LEN);
+
+ *reply_len = 7 + 2 * COOKIE_LEN;
+ return reply;
+}
+
+
+static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
+ void *sock_ctx)
+{
+ struct wpa_global *global = eloop_ctx;
+ struct ctrl_iface_global_priv *priv = sock_ctx;
+ char buf[256], *pos;
+ int res;
+ struct sockaddr_in from;
+ socklen_t fromlen = sizeof(from);
+ char *reply;
+ size_t reply_len;
+ u8 cookie[COOKIE_LEN];
+
+ res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
+ (struct sockaddr *) &from, &fromlen);
+ if (res < 0) {
+ perror("recvfrom(ctrl_iface)");
+ return;
+ }
+ if (from.sin_addr.s_addr != htonl((127 << 24) | 1)) {
+ /*
+ * The OS networking stack is expected to drop this kind of
+ * frames since the socket is bound to only localhost address.
+ * Just in case, drop the frame if it is coming from any other
+ * address.
+ */
+ wpa_printf(MSG_DEBUG, "CTRL: Drop packet from unexpected "
+ "source %s", inet_ntoa(from.sin_addr));
+ return;
+ }
+ buf[res] = '\0';
+
+ if (os_strcmp(buf, "GET_COOKIE") == 0) {
+ reply = wpa_supplicant_global_get_cookie(priv, &reply_len);
+ goto done;
+ }
+
+ if (os_strncmp(buf, "COOKIE=", 7) != 0) {
+ wpa_printf(MSG_DEBUG, "CTLR: No cookie in the request - "
+ "drop request");
+ return;
+ }
+
+ if (hexstr2bin(buf + 7, cookie, COOKIE_LEN) < 0) {
+ wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie format in the "
+ "request - drop request");
+ return;
+ }
+
+ if (os_memcmp(cookie, priv->cookie, COOKIE_LEN) != 0) {
+ wpa_printf(MSG_DEBUG, "CTLR: Invalid cookie in the request - "
+ "drop request");
+ return;
+ }
+
+ pos = buf + 7 + 2 * COOKIE_LEN;
+ while (*pos == ' ')
+ pos++;
+
+ reply = wpa_supplicant_global_ctrl_iface_process(global, pos,
+ &reply_len);
+
+ done:
+ if (reply) {
+ sendto(sock, reply, reply_len, 0, (struct sockaddr *) &from,
+ fromlen);
+ os_free(reply);
+ } else if (reply_len) {
+ sendto(sock, "FAIL\n", 5, 0, (struct sockaddr *) &from,
+ fromlen);
+ }
+}
+
+
+struct ctrl_iface_global_priv *
+wpa_supplicant_global_ctrl_iface_init(struct wpa_global *global)
+{
+ struct ctrl_iface_global_priv *priv;
+ struct sockaddr_in addr;
+
+ priv = os_zalloc(sizeof(*priv));
+ if (priv == NULL)
+ return NULL;
+ priv->sock = -1;
+ os_get_random(priv->cookie, COOKIE_LEN);
+
+ if (global->params.ctrl_interface == NULL)
+ return priv;
+
+ wpa_printf(MSG_DEBUG, "Global control interface '%s'",
+ global->params.ctrl_interface);
+
+ priv->sock = socket(PF_INET, SOCK_DGRAM, 0);
+ if (priv->sock < 0) {
+ perror("socket(PF_INET)");
+ goto fail;
+ }
+
+ os_memset(&addr, 0, sizeof(addr));
+ addr.sin_family = AF_INET;
+ addr.sin_addr.s_addr = htonl((127 << 24) | 1);
+ addr.sin_port = htons(WPA_GLOBAL_CTRL_IFACE_PORT);
+ if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+ perror("bind(AF_INET)");
+ goto fail;
+ }
+
+ eloop_register_read_sock(priv->sock,
+ wpa_supplicant_global_ctrl_iface_receive,
+ global, priv);
+
+ return priv;
+
+fail:
+ if (priv->sock >= 0)
+ close(priv->sock);
+ os_free(priv);
+ return NULL;
+}
+
+
+void
+wpa_supplicant_global_ctrl_iface_deinit(struct ctrl_iface_global_priv *priv)
+{
+ if (priv->sock >= 0) {
+ eloop_unregister_read_sock(priv->sock);
+ close(priv->sock);
+ }
+ os_free(priv);
+}