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-rw-r--r--ctrl_iface_unix.c689
1 files changed, 689 insertions, 0 deletions
diff --git a/ctrl_iface_unix.c b/ctrl_iface_unix.c
new file mode 100644
index 000000000000..9e4f85fabaad
--- /dev/null
+++ b/ctrl_iface_unix.c
@@ -0,0 +1,689 @@
+/*
+ * WPA Supplicant / UNIX domain 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 <sys/un.h>
+#include <sys/stat.h>
+#include <grp.h>
+
+#include "common.h"
+#include "eloop.h"
+#include "config.h"
+#include "eapol_sm.h"
+#include "wpa_supplicant_i.h"
+#include "ctrl_iface.h"
+
+/* 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_unix.c and should not be touched directly from other files.
+ */
+struct wpa_ctrl_dst {
+ struct wpa_ctrl_dst *next;
+ struct sockaddr_un 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;
+};
+
+
+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_un *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_un));
+ dst->addrlen = fromlen;
+ dst->debug_level = MSG_INFO;
+ dst->next = priv->ctrl_dst;
+ priv->ctrl_dst = dst;
+ wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
+ (u8 *) from->sun_path, fromlen - sizeof(from->sun_family));
+ return 0;
+}
+
+
+static int wpa_supplicant_ctrl_iface_detach(struct ctrl_iface_priv *priv,
+ struct sockaddr_un *from,
+ socklen_t fromlen)
+{
+ struct wpa_ctrl_dst *dst, *prev = NULL;
+
+ dst = priv->ctrl_dst;
+ while (dst) {
+ if (fromlen == dst->addrlen &&
+ os_memcmp(from->sun_path, dst->addr.sun_path,
+ fromlen - sizeof(from->sun_family)) == 0) {
+ if (prev == NULL)
+ priv->ctrl_dst = dst->next;
+ else
+ prev->next = dst->next;
+ os_free(dst);
+ wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
+ (u8 *) from->sun_path,
+ fromlen - sizeof(from->sun_family));
+ return 0;
+ }
+ prev = dst;
+ dst = dst->next;
+ }
+ return -1;
+}
+
+
+static int wpa_supplicant_ctrl_iface_level(struct ctrl_iface_priv *priv,
+ struct sockaddr_un *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 (fromlen == dst->addrlen &&
+ os_memcmp(from->sun_path, dst->addr.sun_path,
+ fromlen - sizeof(from->sun_family)) == 0) {
+ wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
+ "level", (u8 *) from->sun_path,
+ fromlen - sizeof(from->sun_family));
+ dst->debug_level = atoi(level);
+ return 0;
+ }
+ dst = dst->next;
+ }
+
+ return -1;
+}
+
+
+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];
+ int res;
+ struct sockaddr_un from;
+ socklen_t fromlen = sizeof(from);
+ char *reply = NULL;
+ size_t reply_len = 0;
+ int new_attached = 0;
+
+ res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
+ (struct sockaddr *) &from, &fromlen);
+ if (res < 0) {
+ perror("recvfrom(ctrl_iface)");
+ return;
+ }
+ buf[res] = '\0';
+
+ if (os_strcmp(buf, "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(buf, "DETACH") == 0) {
+ if (wpa_supplicant_ctrl_iface_detach(priv, &from, fromlen))
+ reply_len = 1;
+ else
+ reply_len = 2;
+ } else if (os_strncmp(buf, "LEVEL ", 6) == 0) {
+ if (wpa_supplicant_ctrl_iface_level(priv, &from, fromlen,
+ buf + 6))
+ reply_len = 1;
+ else
+ reply_len = 2;
+ } else {
+ reply = wpa_supplicant_ctrl_iface_process(wpa_s, buf,
+ &reply_len);
+ }
+
+ 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 char * wpa_supplicant_ctrl_iface_path(struct wpa_supplicant *wpa_s)
+{
+ char *buf;
+ size_t len;
+ char *pbuf, *dir = NULL, *gid_str = NULL;
+
+ if (wpa_s->conf->ctrl_interface == NULL)
+ return NULL;
+
+ pbuf = os_strdup(wpa_s->conf->ctrl_interface);
+ if (pbuf == NULL)
+ return NULL;
+ if (os_strncmp(pbuf, "DIR=", 4) == 0) {
+ dir = pbuf + 4;
+ gid_str = os_strstr(dir, " GROUP=");
+ if (gid_str) {
+ *gid_str = '\0';
+ gid_str += 7;
+ }
+ } else
+ dir = pbuf;
+
+ len = os_strlen(dir) + os_strlen(wpa_s->ifname) + 2;
+ buf = os_malloc(len);
+ if (buf == NULL) {
+ os_free(pbuf);
+ return NULL;
+ }
+
+ os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
+#ifdef __CYGWIN__
+ {
+ /* Windows/WinPcap uses interface names that are not suitable
+ * as a file name - convert invalid chars to underscores */
+ char *pos = buf;
+ while (*pos) {
+ if (*pos == '\\')
+ *pos = '_';
+ pos++;
+ }
+ }
+#endif /* __CYGWIN__ */
+ os_free(pbuf);
+ return buf;
+}
+
+
+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_un addr;
+ char *fname = NULL;
+ gid_t gid = 0;
+ int gid_set = 0;
+ char *buf, *dir = NULL, *gid_str = NULL;
+ struct group *grp;
+ char *endp;
+
+ priv = os_zalloc(sizeof(*priv));
+ if (priv == NULL)
+ return NULL;
+ priv->wpa_s = wpa_s;
+ priv->sock = -1;
+
+ if (wpa_s->conf->ctrl_interface == NULL)
+ return priv;
+
+ buf = os_strdup(wpa_s->conf->ctrl_interface);
+ if (buf == NULL)
+ goto fail;
+ if (os_strncmp(buf, "DIR=", 4) == 0) {
+ dir = buf + 4;
+ gid_str = os_strstr(dir, " GROUP=");
+ if (gid_str) {
+ *gid_str = '\0';
+ gid_str += 7;
+ }
+ } else {
+ dir = buf;
+ gid_str = wpa_s->conf->ctrl_interface_group;
+ }
+
+ if (mkdir(dir, S_IRWXU | S_IRWXG) < 0) {
+ if (errno == EEXIST) {
+ wpa_printf(MSG_DEBUG, "Using existing control "
+ "interface directory.");
+ } else {
+ perror("mkdir[ctrl_interface]");
+ goto fail;
+ }
+ }
+
+ if (gid_str) {
+ grp = getgrnam(gid_str);
+ if (grp) {
+ gid = grp->gr_gid;
+ gid_set = 1;
+ wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d"
+ " (from group name '%s')",
+ (int) gid, gid_str);
+ } else {
+ /* Group name not found - try to parse this as gid */
+ gid = strtol(gid_str, &endp, 10);
+ if (*gid_str == '\0' || *endp != '\0') {
+ wpa_printf(MSG_DEBUG, "CTRL: Invalid group "
+ "'%s'", gid_str);
+ goto fail;
+ }
+ gid_set = 1;
+ wpa_printf(MSG_DEBUG, "ctrl_interface_group=%d",
+ (int) gid);
+ }
+ }
+
+ if (gid_set && chown(dir, -1, gid) < 0) {
+ perror("chown[ctrl_interface]");
+ goto fail;
+ }
+
+ if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
+ sizeof(addr.sun_path))
+ goto fail;
+
+ priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
+ if (priv->sock < 0) {
+ perror("socket(PF_UNIX)");
+ goto fail;
+ }
+
+ os_memset(&addr, 0, sizeof(addr));
+ addr.sun_family = AF_UNIX;
+ fname = wpa_supplicant_ctrl_iface_path(wpa_s);
+ if (fname == NULL)
+ goto fail;
+ os_strncpy(addr.sun_path, fname, sizeof(addr.sun_path));
+ if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+ wpa_printf(MSG_DEBUG, "ctrl_iface bind(PF_UNIX) failed: %s",
+ strerror(errno));
+ if (connect(priv->sock, (struct sockaddr *) &addr,
+ sizeof(addr)) < 0) {
+ wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
+ " allow connections - assuming it was left"
+ "over from forced program termination");
+ if (unlink(fname) < 0) {
+ perror("unlink[ctrl_iface]");
+ wpa_printf(MSG_ERROR, "Could not unlink "
+ "existing ctrl_iface socket '%s'",
+ fname);
+ goto fail;
+ }
+ if (bind(priv->sock, (struct sockaddr *) &addr,
+ sizeof(addr)) < 0) {
+ perror("bind(PF_UNIX)");
+ goto fail;
+ }
+ wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
+ "ctrl_iface socket '%s'", fname);
+ } else {
+ wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
+ "be in use - cannot override it");
+ wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
+ "not used anymore", fname);
+ os_free(fname);
+ fname = NULL;
+ goto fail;
+ }
+ }
+
+ if (gid_set && chown(fname, -1, gid) < 0) {
+ perror("chown[ctrl_interface/ifname]");
+ goto fail;
+ }
+
+ if (chmod(fname, S_IRWXU | S_IRWXG) < 0) {
+ perror("chmod[ctrl_interface/ifname]");
+ goto fail;
+ }
+ os_free(fname);
+
+ eloop_register_read_sock(priv->sock, wpa_supplicant_ctrl_iface_receive,
+ wpa_s, priv);
+ wpa_msg_register_cb(wpa_supplicant_ctrl_iface_msg_cb);
+
+ os_free(buf);
+ return priv;
+
+fail:
+ if (priv->sock >= 0)
+ close(priv->sock);
+ os_free(priv);
+ if (fname) {
+ unlink(fname);
+ os_free(fname);
+ }
+ os_free(buf);
+ return NULL;
+}
+
+
+void wpa_supplicant_ctrl_iface_deinit(struct ctrl_iface_priv *priv)
+{
+ struct wpa_ctrl_dst *dst, *prev;
+
+ if (priv->sock > -1) {
+ char *fname;
+ char *buf, *dir = NULL, *gid_str = NULL;
+ 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;
+ fname = wpa_supplicant_ctrl_iface_path(priv->wpa_s);
+ if (fname) {
+ unlink(fname);
+ os_free(fname);
+ }
+
+ buf = os_strdup(priv->wpa_s->conf->ctrl_interface);
+ if (buf == NULL)
+ goto free_dst;
+ if (os_strncmp(buf, "DIR=", 4) == 0) {
+ dir = buf + 4;
+ gid_str = os_strstr(dir, " GROUP=");
+ if (gid_str) {
+ *gid_str = '\0';
+ gid_str += 7;
+ }
+ } else
+ dir = buf;
+
+ if (rmdir(dir) < 0) {
+ if (errno == ENOTEMPTY) {
+ wpa_printf(MSG_DEBUG, "Control interface "
+ "directory not empty - leaving it "
+ "behind");
+ } else {
+ perror("rmdir[ctrl_interface]");
+ }
+ }
+ os_free(buf);
+ }
+
+free_dst:
+ dst = priv->ctrl_dst;
+ while (dst) {
+ prev = dst;
+ dst = dst->next;
+ os_free(prev);
+ }
+ os_free(priv);
+}
+
+
+/**
+ * wpa_supplicant_ctrl_iface_send - Send a control interface packet to monitors
+ * @priv: Pointer to private data from wpa_supplicant_ctrl_iface_init()
+ * @level: Priority level of the message
+ * @buf: Message data
+ * @len: Message length
+ *
+ * Send a packet to all monitor programs attached to the control interface.
+ */
+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;
+ struct msghdr msg;
+ struct iovec io[2];
+
+ dst = priv->ctrl_dst;
+ if (priv->sock < 0 || dst == NULL)
+ return;
+
+ os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
+ io[0].iov_base = levelstr;
+ io[0].iov_len = os_strlen(levelstr);
+ io[1].iov_base = (char *) buf;
+ io[1].iov_len = len;
+ os_memset(&msg, 0, sizeof(msg));
+ msg.msg_iov = io;
+ msg.msg_iovlen = 2;
+
+ idx = 0;
+ while (dst) {
+ next = dst->next;
+ if (level >= dst->debug_level) {
+ wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
+ (u8 *) dst->addr.sun_path, dst->addrlen -
+ sizeof(dst->addr.sun_family));
+ msg.msg_name = (void *) &dst->addr;
+ msg.msg_namelen = dst->addrlen;
+ if (sendmsg(priv->sock, &msg, 0) < 0) {
+ perror("sendmsg(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;
+ }
+}
+
+
+void wpa_supplicant_ctrl_iface_wait(struct ctrl_iface_priv *priv)
+{
+ char buf[256];
+ int res;
+ struct sockaddr_un from;
+ socklen_t fromlen = sizeof(from);
+
+ for (;;) {
+ wpa_printf(MSG_DEBUG, "CTRL_IFACE - %s - wait for monitor to "
+ "attach", priv->wpa_s->ifname);
+ eloop_wait_for_read_sock(priv->sock);
+
+ res = recvfrom(priv->sock, buf, sizeof(buf) - 1, 0,
+ (struct sockaddr *) &from, &fromlen);
+ if (res < 0) {
+ perror("recvfrom(ctrl_iface)");
+ continue;
+ }
+ buf[res] = '\0';
+
+ if (os_strcmp(buf, "ATTACH") == 0) {
+ /* handle ATTACH signal of first monitor interface */
+ if (!wpa_supplicant_ctrl_iface_attach(priv, &from,
+ fromlen)) {
+ sendto(priv->sock, "OK\n", 3, 0,
+ (struct sockaddr *) &from, fromlen);
+ /* OK to continue */
+ return;
+ } else {
+ sendto(priv->sock, "FAIL\n", 5, 0,
+ (struct sockaddr *) &from, fromlen);
+ }
+ } else {
+ /* return FAIL for all other signals */
+ sendto(priv->sock, "FAIL\n", 5, 0,
+ (struct sockaddr *) &from, fromlen);
+ }
+ }
+}
+
+
+/* Global ctrl_iface */
+
+struct ctrl_iface_global_priv {
+ struct wpa_global *global;
+ int sock;
+};
+
+
+static void wpa_supplicant_global_ctrl_iface_receive(int sock, void *eloop_ctx,
+ void *sock_ctx)
+{
+ struct wpa_global *global = eloop_ctx;
+ char buf[256];
+ int res;
+ struct sockaddr_un from;
+ socklen_t fromlen = sizeof(from);
+ char *reply;
+ size_t reply_len;
+
+ res = recvfrom(sock, buf, sizeof(buf) - 1, 0,
+ (struct sockaddr *) &from, &fromlen);
+ if (res < 0) {
+ perror("recvfrom(ctrl_iface)");
+ return;
+ }
+ buf[res] = '\0';
+
+ reply = wpa_supplicant_global_ctrl_iface_process(global, buf,
+ &reply_len);
+
+ 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_un addr;
+
+ priv = os_zalloc(sizeof(*priv));
+ if (priv == NULL)
+ return NULL;
+ priv->global = global;
+ priv->sock = -1;
+
+ if (global->params.ctrl_interface == NULL)
+ return priv;
+
+ wpa_printf(MSG_DEBUG, "Global control interface '%s'",
+ global->params.ctrl_interface);
+
+ priv->sock = socket(PF_UNIX, SOCK_DGRAM, 0);
+ if (priv->sock < 0) {
+ perror("socket(PF_UNIX)");
+ goto fail;
+ }
+
+ os_memset(&addr, 0, sizeof(addr));
+ addr.sun_family = AF_UNIX;
+ os_strncpy(addr.sun_path, global->params.ctrl_interface,
+ sizeof(addr.sun_path));
+ if (bind(priv->sock, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
+ perror("bind(PF_UNIX)");
+ if (connect(priv->sock, (struct sockaddr *) &addr,
+ sizeof(addr)) < 0) {
+ wpa_printf(MSG_DEBUG, "ctrl_iface exists, but does not"
+ " allow connections - assuming it was left"
+ "over from forced program termination");
+ if (unlink(global->params.ctrl_interface) < 0) {
+ perror("unlink[ctrl_iface]");
+ wpa_printf(MSG_ERROR, "Could not unlink "
+ "existing ctrl_iface socket '%s'",
+ global->params.ctrl_interface);
+ goto fail;
+ }
+ if (bind(priv->sock, (struct sockaddr *) &addr,
+ sizeof(addr)) < 0) {
+ perror("bind(PF_UNIX)");
+ goto fail;
+ }
+ wpa_printf(MSG_DEBUG, "Successfully replaced leftover "
+ "ctrl_iface socket '%s'",
+ global->params.ctrl_interface);
+ } else {
+ wpa_printf(MSG_INFO, "ctrl_iface exists and seems to "
+ "be in use - cannot override it");
+ wpa_printf(MSG_INFO, "Delete '%s' manually if it is "
+ "not used anymore",
+ global->params.ctrl_interface);
+ goto fail;
+ }
+ }
+
+ eloop_register_read_sock(priv->sock,
+ wpa_supplicant_global_ctrl_iface_receive,
+ global, NULL);
+
+ 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);
+ }
+ if (priv->global->params.ctrl_interface)
+ unlink(priv->global->params.ctrl_interface);
+ os_free(priv);
+}
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