+++ /dev/null
-/*
- * WPA Supplicant / UNIX domain socket -based control interface
- * Copyright (c) 2004-2009, 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 <stddef.h>
-
-#include "utils/common.h"
-#include "utils/eloop.h"
-#include "utils/list.h"
-#include "eapol_supp/eapol_supp_sm.h"
-#include "config.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 dl_list list;
- struct sockaddr_un addr;
- socklen_t addrlen;
- int debug_level;
- int errors;
-};
-
-
-struct ctrl_iface_priv {
- struct wpa_supplicant *wpa_s;
- int sock;
- struct dl_list 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;
- dl_list_add(&priv->ctrl_dst, &dst->list);
- wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor attached",
- (u8 *) from->sun_path,
- fromlen - offsetof(struct sockaddr_un, sun_path));
- 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;
-
- dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
- if (fromlen == dst->addrlen &&
- os_memcmp(from->sun_path, dst->addr.sun_path,
- fromlen - offsetof(struct sockaddr_un, sun_path))
- == 0) {
- dl_list_del(&dst->list);
- os_free(dst);
- wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor detached",
- (u8 *) from->sun_path,
- fromlen -
- offsetof(struct sockaddr_un, sun_path));
- return 0;
- }
- }
- 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);
-
- dl_list_for_each(dst, &priv->ctrl_dst, struct wpa_ctrl_dst, list) {
- if (fromlen == dst->addrlen &&
- os_memcmp(from->sun_path, dst->addr.sun_path,
- fromlen - offsetof(struct sockaddr_un, sun_path))
- == 0) {
- wpa_hexdump(MSG_DEBUG, "CTRL_IFACE changed monitor "
- "level", (u8 *) from->sun_path,
- fromlen -
- offsetof(struct sockaddr_un, sun_path));
- dst->debug_level = atoi(level);
- return 0;
- }
- }
-
- 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[4096];
- 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;
- int res;
-
- 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;
- }
-
- res = os_snprintf(buf, len, "%s/%s", dir, wpa_s->ifname);
- if (res < 0 || (size_t) res >= len) {
- os_free(pbuf);
- os_free(buf);
- return NULL;
- }
-#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;
- dl_list_init(&priv->ctrl_dst);
- 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_ERROR, "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;
- }
-
- /* Make sure the group can enter and read the directory */
- if (gid_set &&
- chmod(dir, S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP) < 0) {
- wpa_printf(MSG_ERROR, "CTRL: chmod[ctrl_interface]: %s",
- strerror(errno));
- goto fail;
- }
-
- if (os_strlen(dir) + 1 + os_strlen(wpa_s->ifname) >=
- sizeof(addr.sun_path)) {
- wpa_printf(MSG_ERROR, "ctrl_iface path limit exceeded");
- 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));
-#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
- addr.sun_len = sizeof(addr);
-#endif /* __FreeBSD__ */
- addr.sun_family = AF_UNIX;
- fname = wpa_supplicant_ctrl_iface_path(wpa_s);
- if (fname == NULL)
- goto fail;
- os_strlcpy(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 (!dl_list_empty(&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:
- dl_list_for_each_safe(dst, prev, &priv->ctrl_dst, struct wpa_ctrl_dst,
- list)
- os_free(dst);
- 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, res;
- struct msghdr msg;
- struct iovec io[2];
-
- if (priv->sock < 0 || dl_list_empty(&priv->ctrl_dst))
- return;
-
- res = os_snprintf(levelstr, sizeof(levelstr), "<%d>", level);
- if (res < 0 || (size_t) res >= sizeof(levelstr))
- return;
- 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;
- dl_list_for_each_safe(dst, next, &priv->ctrl_dst, struct wpa_ctrl_dst,
- list) {
- if (level >= dst->debug_level) {
- wpa_hexdump(MSG_DEBUG, "CTRL_IFACE monitor send",
- (u8 *) dst->addr.sun_path, dst->addrlen -
- offsetof(struct sockaddr_un, sun_path));
- msg.msg_name = (void *) &dst->addr;
- msg.msg_namelen = dst->addrlen;
- if (sendmsg(priv->sock, &msg, 0) < 0) {
- int _errno = errno;
- wpa_printf(MSG_INFO, "CTRL_IFACE monitor[%d]: "
- "%d - %s",
- idx, errno, strerror(errno));
- dst->errors++;
- if (dst->errors > 1000 ||
- (_errno != ENOBUFS && dst->errors > 10) ||
- _errno == ENOENT) {
- wpa_supplicant_ctrl_iface_detach(
- priv, &dst->addr,
- dst->addrlen);
- }
- } else
- dst->errors = 0;
- }
- idx++;
- }
-}
-
-
-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));
-#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
- addr.sun_len = sizeof(addr);
-#endif /* __FreeBSD__ */
- addr.sun_family = AF_UNIX;
- os_strlcpy(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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